The Tor Browser: media/libvpx/vp9/encoder/vp9_rdopt.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_rdopt.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_rdopt.c

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include <stdio.h>
 #include <math.h>
 #include <limits.h>
 #include <assert.h>
 #include "vp9/common/vp9_pragmas.h"
 #include "vp9/encoder/vp9_tokenize.h"
 #include "vp9/encoder/vp9_treewriter.h"
 #include "vp9/encoder/vp9_onyx_int.h"
 #include "vp9/encoder/vp9_modecosts.h"
 #include "vp9/encoder/vp9_encodeintra.h"
 #include "vp9/common/vp9_entropymode.h"
 #include "vp9/common/vp9_reconinter.h"
 #include "vp9/common/vp9_reconintra.h"
 #include "vp9/common/vp9_findnearmv.h"
 #include "vp9/common/vp9_quant_common.h"
 #include "vp9/encoder/vp9_encodemb.h"
 #include "vp9/encoder/vp9_quantize.h"
 #include "vp9/encoder/vp9_variance.h"
 #include "vp9/encoder/vp9_mcomp.h"
 #include "vp9/encoder/vp9_rdopt.h"
 #include "vp9/encoder/vp9_ratectrl.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vp9/common/vp9_systemdependent.h"
 #include "vp9/encoder/vp9_encodemv.h"
 #include "vp9/common/vp9_seg_common.h"
 #include "vp9/common/vp9_pred_common.h"
 #include "vp9/common/vp9_entropy.h"
 #include "./vp9_rtcd.h"
 #include "vp9/common/vp9_mvref_common.h"
 #include "vp9/common/vp9_common.h"
 #define INVALID_MV 0x80008000
 /* Factor to weigh the rate for switchable interp filters */
 #define SWITCHABLE_INTERP_RATE_FACTOR 1
 #define LAST_FRAME_MODE_MASK    0xFFEDCD60
 #define GOLDEN_FRAME_MODE_MASK  0xFFDA3BB0
 #define ALT_REF_MODE_MASK       0xFFC648D0
 #define MIN_EARLY_TERM_INDEX    3
 const MODE_DEFINITION vp9_mode_order[MAX_MODES] = {
   {NEARESTMV, LAST_FRAME,   NONE},
   {NEARESTMV, ALTREF_FRAME, NONE},
   {NEARESTMV, GOLDEN_FRAME, NONE},
   {DC_PRED,   INTRA_FRAME,  NONE},
   {NEWMV,     LAST_FRAME,   NONE},
   {NEWMV,     ALTREF_FRAME, NONE},
   {NEWMV,     GOLDEN_FRAME, NONE},
   {NEARMV,    LAST_FRAME,   NONE},
   {NEARMV,    ALTREF_FRAME, NONE},
   {NEARESTMV, LAST_FRAME,   ALTREF_FRAME},
   {NEARESTMV, GOLDEN_FRAME, ALTREF_FRAME},
   {TM_PRED,   INTRA_FRAME,  NONE},
   {NEARMV,    LAST_FRAME,   ALTREF_FRAME},
   {NEWMV,     LAST_FRAME,   ALTREF_FRAME},
   {NEARMV,    GOLDEN_FRAME, NONE},
   {NEARMV,    GOLDEN_FRAME, ALTREF_FRAME},
   {NEWMV,     GOLDEN_FRAME, ALTREF_FRAME},
   {ZEROMV,    LAST_FRAME,   NONE},
   {ZEROMV,    GOLDEN_FRAME, NONE},
   {ZEROMV,    ALTREF_FRAME, NONE},
   {ZEROMV,    LAST_FRAME,   ALTREF_FRAME},
   {ZEROMV,    GOLDEN_FRAME, ALTREF_FRAME},
   {H_PRED,    INTRA_FRAME,  NONE},
   {V_PRED,    INTRA_FRAME,  NONE},
   {D135_PRED, INTRA_FRAME,  NONE},
   {D207_PRED, INTRA_FRAME,  NONE},
   {D153_PRED, INTRA_FRAME,  NONE},
   {D63_PRED,  INTRA_FRAME,  NONE},
   {D117_PRED, INTRA_FRAME,  NONE},
   {D45_PRED,  INTRA_FRAME,  NONE},
 };
 const REF_DEFINITION vp9_ref_order[MAX_REFS] = {
   {LAST_FRAME,   NONE},
   {GOLDEN_FRAME, NONE},
   {ALTREF_FRAME, NONE},
   {LAST_FRAME,   ALTREF_FRAME},
   {GOLDEN_FRAME, ALTREF_FRAME},
   {INTRA_FRAME,  NONE},
 };
 // The baseline rd thresholds for breaking out of the rd loop for
 // certain modes are assumed to be based on 8x8 blocks.
 // This table is used to correct for blocks size.
 // The factors here are << 2 (2 = x0.5, 32 = x8 etc).
 static int rd_thresh_block_size_factor[BLOCK_SIZES] =
   {2, 3, 3, 4, 6, 6, 8, 12, 12, 16, 24, 24, 32};
 #define RD_THRESH_MAX_FACT 64
 #define RD_THRESH_INC      1
 #define RD_THRESH_POW      1.25
 #define RD_MULT_EPB_RATIO  64
 #define MV_COST_WEIGHT      108
 #define MV_COST_WEIGHT_SUB  120
 static void fill_token_costs(vp9_coeff_cost *c,
                              vp9_coeff_probs_model (*p)[BLOCK_TYPES]) {
   int i, j, k, l;
   TX_SIZE t;
   for (t = TX_4X4; t <= TX_32X32; t++)
     for (i = 0; i < BLOCK_TYPES; i++)
       for (j = 0; j < REF_TYPES; j++)
         for (k = 0; k < COEF_BANDS; k++)
           for (l = 0; l < PREV_COEF_CONTEXTS; l++) {
             vp9_prob probs[ENTROPY_NODES];
             vp9_model_to_full_probs(p[t][i][j][k][l], probs);
             vp9_cost_tokens((int *)c[t][i][j][k][0][l], probs,
                             vp9_coef_tree);
             vp9_cost_tokens_skip((int *)c[t][i][j][k][1][l], probs,
                                  vp9_coef_tree);
             assert(c[t][i][j][k][0][l][DCT_EOB_TOKEN] ==
                    c[t][i][j][k][1][l][DCT_EOB_TOKEN]);
           }
 }
 static const int rd_iifactor[32] = {
 , 4, 3, 2, 1, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0,
 };
 // 3* dc_qlookup[Q]*dc_qlookup[Q];
 /* values are now correlated to quantizer */
 static int sad_per_bit16lut[QINDEX_RANGE];
 static int sad_per_bit4lut[QINDEX_RANGE];
 void vp9_init_me_luts() {
   int i;
   // Initialize the sad lut tables using a formulaic calculation for now
   // This is to make it easier to resolve the impact of experimental changes
   // to the quantizer tables.
   for (i = 0; i < QINDEX_RANGE; i++) {
     sad_per_bit16lut[i] =
       (int)((0.0418 * vp9_convert_qindex_to_q(i)) + 2.4107);
     sad_per_bit4lut[i] = (int)(0.063 * vp9_convert_qindex_to_q(i) + 2.742);
   }
 }
 int vp9_compute_rd_mult(VP9_COMP *cpi, int qindex) {
   const int q = vp9_dc_quant(qindex, 0);
   // TODO(debargha): Adjust the function below
   int rdmult = 88 * q * q / 25;
   if (cpi->pass == 2 && (cpi->common.frame_type != KEY_FRAME)) {
     if (cpi->twopass.next_iiratio > 31)
       rdmult += (rdmult * rd_iifactor[31]) >> 4;
     else
       rdmult += (rdmult * rd_iifactor[cpi->twopass.next_iiratio]) >> 4;
   }
   return rdmult;
 }
 static int compute_rd_thresh_factor(int qindex) {
   int q;
   // TODO(debargha): Adjust the function below
   q = (int)(pow(vp9_dc_quant(qindex, 0) / 4.0, RD_THRESH_POW) * 5.12);
   if (q < 8)
     q = 8;
   return q;
 }
 void vp9_initialize_me_consts(VP9_COMP *cpi, int qindex) {
   cpi->mb.sadperbit16 = sad_per_bit16lut[qindex];
   cpi->mb.sadperbit4 = sad_per_bit4lut[qindex];
 }
 static void set_block_thresholds(VP9_COMP *cpi) {
   int i, bsize, segment_id;
   VP9_COMMON *cm = &cpi->common;
   for (segment_id = 0; segment_id < MAX_SEGMENTS; ++segment_id) {
     int q;
     int segment_qindex = vp9_get_qindex(&cm->seg, segment_id, cm->base_qindex);
     segment_qindex = clamp(segment_qindex + cm->y_dc_delta_q, 0, MAXQ);
     q = compute_rd_thresh_factor(segment_qindex);
     for (bsize = 0; bsize < BLOCK_SIZES; ++bsize) {
       // Threshold here seem unecessarily harsh but fine given actual
       // range of values used for cpi->sf.thresh_mult[]
       int thresh_max = INT_MAX / (q * rd_thresh_block_size_factor[bsize]);
       for (i = 0; i < MAX_MODES; ++i) {
         if (cpi->sf.thresh_mult[i] < thresh_max) {
           cpi->rd_threshes[segment_id][bsize][i] =
               cpi->sf.thresh_mult[i] * q *
               rd_thresh_block_size_factor[bsize] / 4;
         } else {
           cpi->rd_threshes[segment_id][bsize][i] = INT_MAX;
         }
       }
       for (i = 0; i < MAX_REFS; ++i) {
         if (cpi->sf.thresh_mult_sub8x8[i] < thresh_max) {
           cpi->rd_thresh_sub8x8[segment_id][bsize][i] =
               cpi->sf.thresh_mult_sub8x8[i] * q *
               rd_thresh_block_size_factor[bsize] / 4;
         } else {
           cpi->rd_thresh_sub8x8[segment_id][bsize][i] = INT_MAX;
         }
       }
     }
   }
 }
 void vp9_initialize_rd_consts(VP9_COMP *cpi) {
   VP9_COMMON *cm = &cpi->common;
   int qindex, i;
   vp9_clear_system_state();  // __asm emms;
   // Further tests required to see if optimum is different
   // for key frames, golden frames and arf frames.
   // if (cpi->common.refresh_golden_frame ||
   //     cpi->common.refresh_alt_ref_frame)
   qindex = clamp(cm->base_qindex + cm->y_dc_delta_q, 0, MAXQ);
   cpi->RDDIV = RDDIV_BITS;  // in bits (to multiply D by 128)
   cpi->RDMULT = vp9_compute_rd_mult(cpi, qindex);
   cpi->mb.errorperbit = cpi->RDMULT / RD_MULT_EPB_RATIO;
   cpi->mb.errorperbit += (cpi->mb.errorperbit == 0);
   vp9_set_speed_features(cpi);
   cpi->mb.select_txfm_size = (cpi->sf.tx_size_search_method == USE_LARGESTALL &&
                               cm->frame_type != KEY_FRAME) ?
 : 1;
   set_block_thresholds(cpi);
   fill_token_costs(cpi->mb.token_costs, cm->fc.coef_probs);
   for (i = 0; i < PARTITION_CONTEXTS; i++)
     vp9_cost_tokens(cpi->mb.partition_cost[i], get_partition_probs(cm, i),
                     vp9_partition_tree);
   /*rough estimate for costing*/
   vp9_init_mode_costs(cpi);
   if (!frame_is_intra_only(cm)) {
     vp9_build_nmv_cost_table(
         cpi->mb.nmvjointcost,
         cm->allow_high_precision_mv ? cpi->mb.nmvcost_hp : cpi->mb.nmvcost,
         &cm->fc.nmvc,
         cm->allow_high_precision_mv, 1, 1);
     for (i = 0; i < INTER_MODE_CONTEXTS; i++) {
       MB_PREDICTION_MODE m;
       for (m = NEARESTMV; m < MB_MODE_COUNT; m++)
         cpi->mb.inter_mode_cost[i][INTER_OFFSET(m)] =
             cost_token(vp9_inter_mode_tree,
                        cm->fc.inter_mode_probs[i],
                        &vp9_inter_mode_encodings[INTER_OFFSET(m)]);
     }
   }
 }
 static INLINE void linear_interpolate2(double x, int ntab, int inv_step,
                                        const double *tab1, const double *tab2,
                                        double *v1, double *v2) {
   double y = x * inv_step;
   int d = (int) y;
   if (d >= ntab - 1) {
     *v1 = tab1[ntab - 1];
     *v2 = tab2[ntab - 1];
   } else {
     double a = y - d;
     *v1 = tab1[d] * (1 - a) + tab1[d + 1] * a;
     *v2 = tab2[d] * (1 - a) + tab2[d + 1] * a;
   }
 }
 static void model_rd_norm(double x, double *R, double *D) {
   static const int inv_tab_step = 8;
   static const int tab_size = 120;
   // NOTE: The tables below must be of the same size
   //
   // Normalized rate
   // This table models the rate for a Laplacian source
   // source with given variance when quantized with a uniform quantizer
   // with given stepsize. The closed form expression is:
   // Rn(x) = H(sqrt(r)) + sqrt(r)*[1 + H(r)/(1 - r)],
   // where r = exp(-sqrt(2) * x) and x = qpstep / sqrt(variance),
   // and H(x) is the binary entropy function.
   static const double rate_tab[] = {
 .00, 4.944, 3.949, 3.372, 2.966, 2.655, 2.403, 2.194,
 .014, 1.858, 1.720, 1.596, 1.485, 1.384, 1.291, 1.206,
 .127, 1.054, 0.986, 0.923, 0.863, 0.808, 0.756, 0.708,
 .662, 0.619, 0.579, 0.541, 0.506, 0.473, 0.442, 0.412,
 .385, 0.359, 0.335, 0.313, 0.291, 0.272, 0.253, 0.236,
 .220, 0.204, 0.190, 0.177, 0.165, 0.153, 0.142, 0.132,
 .123, 0.114, 0.106, 0.099, 0.091, 0.085, 0.079, 0.073,
 .068, 0.063, 0.058, 0.054, 0.050, 0.047, 0.043, 0.040,
 .037, 0.034, 0.032, 0.029, 0.027, 0.025, 0.023, 0.022,
 .020, 0.019, 0.017, 0.016, 0.015, 0.014, 0.013, 0.012,
 .011, 0.010, 0.009, 0.008, 0.008, 0.007, 0.007, 0.006,
 .006, 0.005, 0.005, 0.005, 0.004, 0.004, 0.004, 0.003,
 .003, 0.003, 0.003, 0.002, 0.002, 0.002, 0.002, 0.002,
 .002, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001,
 .001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.000,
   };
   // Normalized distortion
   // This table models the normalized distortion for a Laplacian source
   // source with given variance when quantized with a uniform quantizer
   // with given stepsize. The closed form expression is:
   // Dn(x) = 1 - 1/sqrt(2) * x / sinh(x/sqrt(2))
   // where x = qpstep / sqrt(variance)
   // Note the actual distortion is Dn * variance.
   static const double dist_tab[] = {
 .000, 0.001, 0.005, 0.012, 0.021, 0.032, 0.045, 0.061,
 .079, 0.098, 0.119, 0.142, 0.166, 0.190, 0.216, 0.242,
 .269, 0.296, 0.324, 0.351, 0.378, 0.405, 0.432, 0.458,
 .484, 0.509, 0.534, 0.557, 0.580, 0.603, 0.624, 0.645,
 .664, 0.683, 0.702, 0.719, 0.735, 0.751, 0.766, 0.780,
 .794, 0.807, 0.819, 0.830, 0.841, 0.851, 0.861, 0.870,
 .878, 0.886, 0.894, 0.901, 0.907, 0.913, 0.919, 0.925,
 .930, 0.935, 0.939, 0.943, 0.947, 0.951, 0.954, 0.957,
 .960, 0.963, 0.966, 0.968, 0.971, 0.973, 0.975, 0.976,
 .978, 0.980, 0.981, 0.982, 0.984, 0.985, 0.986, 0.987,
 .988, 0.989, 0.990, 0.990, 0.991, 0.992, 0.992, 0.993,
 .993, 0.994, 0.994, 0.995, 0.995, 0.996, 0.996, 0.996,
 .996, 0.997, 0.997, 0.997, 0.997, 0.998, 0.998, 0.998,
 .998, 0.998, 0.998, 0.999, 0.999, 0.999, 0.999, 0.999,
 .999, 0.999, 0.999, 0.999, 0.999, 0.999, 0.999, 1.000,
   };
   /*
   assert(sizeof(rate_tab) == tab_size * sizeof(rate_tab[0]);
   assert(sizeof(dist_tab) == tab_size * sizeof(dist_tab[0]);
   assert(sizeof(rate_tab) == sizeof(dist_tab));
   */
   assert(x >= 0.0);
   linear_interpolate2(x, tab_size, inv_tab_step,
                       rate_tab, dist_tab, R, D);
 }
 static void model_rd_from_var_lapndz(int var, int n, int qstep,
                                      int *rate, int64_t *dist) {
   // This function models the rate and distortion for a Laplacian
   // source with given variance when quantized with a uniform quantizer
   // with given stepsize. The closed form expressions are in:
   // Hang and Chen, "Source Model for transform video coder and its
   // application - Part I: Fundamental Theory", IEEE Trans. Circ.
   // Sys. for Video Tech., April 1997.
   vp9_clear_system_state();
   if (var == 0 || n == 0) {
     *rate = 0;
     *dist = 0;
   } else {
     double D, R;
     double s2 = (double) var / n;
     double x = qstep / sqrt(s2);
     model_rd_norm(x, &R, &D);
     *rate = (int)((n << 8) * R + 0.5);
     *dist = (int)(var * D + 0.5);
   }
   vp9_clear_system_state();
 }
 static void model_rd_for_sb(VP9_COMP *cpi, BLOCK_SIZE bsize,
                             MACROBLOCK *x, MACROBLOCKD *xd,
                             int *out_rate_sum, int64_t *out_dist_sum) {
   // Note our transform coeffs are 8 times an orthogonal transform.
   // Hence quantizer step is also 8 times. To get effective quantizer
   // we need to divide by 8 before sending to modeling function.
   int i, rate_sum = 0, dist_sum = 0;
   for (i = 0; i < MAX_MB_PLANE; ++i) {
     struct macroblock_plane *const p = &x->plane[i];
     struct macroblockd_plane *const pd = &xd->plane[i];
     const BLOCK_SIZE bs = get_plane_block_size(bsize, pd);
     unsigned int sse;
     int rate;
     int64_t dist;
     (void) cpi->fn_ptr[bs].vf(p->src.buf, p->src.stride,
                               pd->dst.buf, pd->dst.stride, &sse);
     // sse works better than var, since there is no dc prediction used
     model_rd_from_var_lapndz(sse, 1 << num_pels_log2_lookup[bs],
                              pd->dequant[1] >> 3, &rate, &dist);
     rate_sum += rate;
     dist_sum += (int)dist;
   }
   *out_rate_sum = rate_sum;
   *out_dist_sum = dist_sum << 4;
 }
 static void model_rd_for_sb_y_tx(VP9_COMP *cpi, BLOCK_SIZE bsize,
                                  TX_SIZE tx_size,
                                  MACROBLOCK *x, MACROBLOCKD *xd,
                                  int *out_rate_sum, int64_t *out_dist_sum,
                                  int *out_skip) {
   int j, k;
   BLOCK_SIZE bs;
   struct macroblock_plane *const p = &x->plane[0];
   struct macroblockd_plane *const pd = &xd->plane[0];
   const int width = 4 << num_4x4_blocks_wide_lookup[bsize];
   const int height = 4 << num_4x4_blocks_high_lookup[bsize];
   int rate_sum = 0;
   int64_t dist_sum = 0;
   const int t = 4 << tx_size;
   if (tx_size == TX_4X4) {
     bs = BLOCK_4X4;
   } else if (tx_size == TX_8X8) {
     bs = BLOCK_8X8;
   } else if (tx_size == TX_16X16) {
     bs = BLOCK_16X16;
   } else if (tx_size == TX_32X32) {
     bs = BLOCK_32X32;
   } else {
     assert(0);
   }
   *out_skip = 1;
   for (j = 0; j < height; j += t) {
     for (k = 0; k < width; k += t) {
       int rate;
       int64_t dist;
       unsigned int sse;
       cpi->fn_ptr[bs].vf(&p->src.buf[j * p->src.stride + k], p->src.stride,
                          &pd->dst.buf[j * pd->dst.stride + k], pd->dst.stride,
                          &sse);
       // sse works better than var, since there is no dc prediction used
       model_rd_from_var_lapndz(sse, t * t, pd->dequant[1] >> 3, &rate, &dist);
       rate_sum += rate;
       dist_sum += dist;
       *out_skip &= (rate < 1024);
     }
   }
   *out_rate_sum = rate_sum;
   *out_dist_sum = dist_sum << 4;
 }
 int64_t vp9_block_error_c(int16_t *coeff, int16_t *dqcoeff,
                           intptr_t block_size, int64_t *ssz) {
   int i;
   int64_t error = 0, sqcoeff = 0;
   for (i = 0; i < block_size; i++) {
     int this_diff = coeff[i] - dqcoeff[i];
     error += (unsigned)this_diff * this_diff;
     sqcoeff += (unsigned) coeff[i] * coeff[i];
   }
   *ssz = sqcoeff;
   return error;
 }
 /* The trailing '0' is a terminator which is used inside cost_coeffs() to
  * decide whether to include cost of a trailing EOB node or not (i.e. we
  * can skip this if the last coefficient in this transform block, e.g. the
  * 16th coefficient in a 4x4 block or the 64th coefficient in a 8x8 block,
  * were non-zero). */
 static const int16_t band_counts[TX_SIZES][8] = {
   { 1, 2, 3, 4,  3,   16 - 13, 0 },
   { 1, 2, 3, 4, 11,   64 - 21, 0 },
   { 1, 2, 3, 4, 11,  256 - 21, 0 },
   { 1, 2, 3, 4, 11, 1024 - 21, 0 },
 };
 static INLINE int cost_coeffs(MACROBLOCK *x,
                               int plane, int block,
                               ENTROPY_CONTEXT *A, ENTROPY_CONTEXT *L,
                               TX_SIZE tx_size,
                               const int16_t *scan, const int16_t *nb) {
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   struct macroblockd_plane *pd = &xd->plane[plane];
   const PLANE_TYPE type = pd->plane_type;
   const int16_t *band_count = &band_counts[tx_size][1];
   const int eob = pd->eobs[block];
   const int16_t *const qcoeff_ptr = BLOCK_OFFSET(pd->qcoeff, block);
   const int ref = mbmi->ref_frame[0] != INTRA_FRAME;
   unsigned int (*token_costs)[2][PREV_COEF_CONTEXTS][MAX_ENTROPY_TOKENS] =
                    x->token_costs[tx_size][type][ref];
   const ENTROPY_CONTEXT above_ec = !!*A, left_ec = !!*L;
   uint8_t *p_tok = x->token_cache;
   int pt = combine_entropy_contexts(above_ec, left_ec);
   int c, cost;
   // Check for consistency of tx_size with mode info
   assert(type == PLANE_TYPE_Y_WITH_DC ? mbmi->tx_size == tx_size
                                       : get_uv_tx_size(mbmi) == tx_size);
   if (eob == 0) {
     // single eob token
     cost = token_costs[0][0][pt][DCT_EOB_TOKEN];
     c = 0;
   } else {
     int band_left = *band_count++;
     // dc token
     int v = qcoeff_ptr[0];
     int prev_t = vp9_dct_value_tokens_ptr[v].token;
     cost = (*token_costs)[0][pt][prev_t] + vp9_dct_value_cost_ptr[v];
     p_tok[0] = vp9_pt_energy_class[prev_t];
     ++token_costs;
     // ac tokens
     for (c = 1; c < eob; c++) {
       const int rc = scan[c];
       int t;
       v = qcoeff_ptr[rc];
       t = vp9_dct_value_tokens_ptr[v].token;
       pt = get_coef_context(nb, p_tok, c);
       cost += (*token_costs)[!prev_t][pt][t] + vp9_dct_value_cost_ptr[v];
       p_tok[rc] = vp9_pt_energy_class[t];
       prev_t = t;
       if (!--band_left) {
         band_left = *band_count++;
         ++token_costs;
       }
     }
     // eob token
     if (band_left) {
       pt = get_coef_context(nb, p_tok, c);
       cost += (*token_costs)[0][pt][DCT_EOB_TOKEN];
     }
   }
   // is eob first coefficient;
   *A = *L = (c > 0);
   return cost;
 }
 static void dist_block(int plane, int block, TX_SIZE tx_size, void *arg) {
   const int ss_txfrm_size = tx_size << 1;
   struct rdcost_block_args* args = arg;
   MACROBLOCK* const x = args->x;
   MACROBLOCKD* const xd = &x->e_mbd;
   struct macroblock_plane *const p = &x->plane[plane];
   struct macroblockd_plane *const pd = &xd->plane[plane];
   int64_t this_sse;
   int shift = args->tx_size == TX_32X32 ? 0 : 2;
   int16_t *const coeff = BLOCK_OFFSET(p->coeff, block);
   int16_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
   args->dist = vp9_block_error(coeff, dqcoeff, 16 << ss_txfrm_size,
                                &this_sse) >> shift;
   args->sse  = this_sse >> shift;
   if (x->skip_encode &&
       xd->mi_8x8[0]->mbmi.ref_frame[0] == INTRA_FRAME) {
     // TODO(jingning): tune the model to better capture the distortion.
     int64_t p = (pd->dequant[1] * pd->dequant[1] *
                     (1 << ss_txfrm_size)) >> (shift + 2);
     args->dist += (p >> 4);
     args->sse  += p;
   }
 }
 static void rate_block(int plane, int block, BLOCK_SIZE plane_bsize,
                        TX_SIZE tx_size, void *arg) {
   struct rdcost_block_args* args = arg;
   int x_idx, y_idx;
   txfrm_block_to_raster_xy(plane_bsize, args->tx_size, block, &x_idx, &y_idx);
   args->rate = cost_coeffs(args->x, plane, block, args->t_above + x_idx,
                            args->t_left + y_idx, args->tx_size,
                            args->scan, args->nb);
 }
 static void block_yrd_txfm(int plane, int block, BLOCK_SIZE plane_bsize,
                            TX_SIZE tx_size, void *arg) {
   struct rdcost_block_args *args = arg;
   MACROBLOCK *const x = args->x;
   MACROBLOCKD *const xd = &x->e_mbd;
   struct encode_b_args encode_args = {x, NULL};
   int64_t rd1, rd2, rd;
   if (args->skip)
     return;
   if (!is_inter_block(&xd->mi_8x8[0]->mbmi))
     vp9_encode_block_intra(plane, block, plane_bsize, tx_size, &encode_args);
   else
     vp9_xform_quant(plane, block, plane_bsize, tx_size, &encode_args);
   dist_block(plane, block, tx_size, args);
   rate_block(plane, block, plane_bsize, tx_size, args);
   rd1 = RDCOST(x->rdmult, x->rddiv, args->rate, args->dist);
   rd2 = RDCOST(x->rdmult, x->rddiv, 0, args->sse);
   // TODO(jingning): temporarily enabled only for luma component
   rd = MIN(rd1, rd2);
   if (!xd->lossless && plane == 0)
     x->zcoeff_blk[tx_size][block] = rd1 > rd2 || !xd->plane[plane].eobs[block];
   args->this_rate += args->rate;
   args->this_dist += args->dist;
   args->this_sse  += args->sse;
   args->this_rd += rd;
   if (args->this_rd > args->best_rd) {
     args->skip = 1;
     return;
   }
 }
 void vp9_get_entropy_contexts(TX_SIZE tx_size,
     ENTROPY_CONTEXT t_above[16], ENTROPY_CONTEXT t_left[16],
     const ENTROPY_CONTEXT *above, const ENTROPY_CONTEXT *left,
     int num_4x4_w, int num_4x4_h) {
   int i;
   switch (tx_size) {
     case TX_4X4:
       vpx_memcpy(t_above, above, sizeof(ENTROPY_CONTEXT) * num_4x4_w);
       vpx_memcpy(t_left, left, sizeof(ENTROPY_CONTEXT) * num_4x4_h);
       break;
     case TX_8X8:
       for (i = 0; i < num_4x4_w; i += 2)
         t_above[i] = !!*(const uint16_t *)&above[i];
       for (i = 0; i < num_4x4_h; i += 2)
         t_left[i] = !!*(const uint16_t *)&left[i];
       break;
     case TX_16X16:
       for (i = 0; i < num_4x4_w; i += 4)
         t_above[i] = !!*(const uint32_t *)&above[i];
       for (i = 0; i < num_4x4_h; i += 4)
         t_left[i] = !!*(const uint32_t *)&left[i];
       break;
     case TX_32X32:
       for (i = 0; i < num_4x4_w; i += 8)
         t_above[i] = !!*(const uint64_t *)&above[i];
       for (i = 0; i < num_4x4_h; i += 8)
         t_left[i] = !!*(const uint64_t *)&left[i];
       break;
     default:
       assert(!"Invalid transform size.");
   }
 }
 static void init_rdcost_stack(MACROBLOCK *x, TX_SIZE tx_size,
                               const int num_4x4_w, const int num_4x4_h,
                               const int64_t ref_rdcost,
                               struct rdcost_block_args *arg) {
   vpx_memset(arg, 0, sizeof(struct rdcost_block_args));
   arg->x = x;
   arg->tx_size = tx_size;
   arg->bw = num_4x4_w;
   arg->bh = num_4x4_h;
   arg->best_rd = ref_rdcost;
 }
 static void txfm_rd_in_plane(MACROBLOCK *x,
                              struct rdcost_block_args *rd_stack,
                              int *rate, int64_t *distortion,
                              int *skippable, int64_t *sse,
                              int64_t ref_best_rd, int plane,
                              BLOCK_SIZE bsize, TX_SIZE tx_size) {
   MACROBLOCKD *const xd = &x->e_mbd;
   struct macroblockd_plane *const pd = &xd->plane[plane];
   const BLOCK_SIZE bs = get_plane_block_size(bsize, pd);
   const int num_4x4_w = num_4x4_blocks_wide_lookup[bs];
   const int num_4x4_h = num_4x4_blocks_high_lookup[bs];
   init_rdcost_stack(x, tx_size, num_4x4_w, num_4x4_h,
                     ref_best_rd, rd_stack);
   if (plane == 0)
     xd->mi_8x8[0]->mbmi.tx_size = tx_size;
   vp9_get_entropy_contexts(tx_size, rd_stack->t_above, rd_stack->t_left,
                            pd->above_context, pd->left_context,
                            num_4x4_w, num_4x4_h);
   get_scan(xd, tx_size, pd->plane_type, 0, &rd_stack->scan, &rd_stack->nb);
   foreach_transformed_block_in_plane(xd, bsize, plane,
                                      block_yrd_txfm, rd_stack);
   if (rd_stack->skip) {
     *rate       = INT_MAX;
     *distortion = INT64_MAX;
     *sse        = INT64_MAX;
     *skippable  = 0;
   } else {
     *distortion = rd_stack->this_dist;
     *rate       = rd_stack->this_rate;
     *sse        = rd_stack->this_sse;
     *skippable  = vp9_is_skippable_in_plane(xd, bsize, plane);
   }
 }
 static void choose_largest_txfm_size(VP9_COMP *cpi, MACROBLOCK *x,
                                      int *rate, int64_t *distortion,
                                      int *skip, int64_t *sse,
                                      int64_t ref_best_rd,
                                      BLOCK_SIZE bs) {
   const TX_SIZE max_tx_size = max_txsize_lookup[bs];
   VP9_COMMON *const cm = &cpi->common;
   const TX_SIZE largest_tx_size = tx_mode_to_biggest_tx_size[cm->tx_mode];
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   mbmi->tx_size = MIN(max_tx_size, largest_tx_size);
   txfm_rd_in_plane(x, &cpi->rdcost_stack, rate, distortion, skip,
                    &sse[mbmi->tx_size], ref_best_rd, 0, bs,
                    mbmi->tx_size);
   cpi->tx_stepdown_count[0]++;
 }
 static void choose_txfm_size_from_rd(VP9_COMP *cpi, MACROBLOCK *x,
                                      int (*r)[2], int *rate,
                                      int64_t *d, int64_t *distortion,
                                      int *s, int *skip,
                                      int64_t tx_cache[TX_MODES],
                                      BLOCK_SIZE bs) {
   const TX_SIZE max_tx_size = max_txsize_lookup[bs];
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   vp9_prob skip_prob = vp9_get_pred_prob_mbskip(cm, xd);
   int64_t rd[TX_SIZES][2];
   int n, m;
   int s0, s1;
   const vp9_prob *tx_probs = get_tx_probs2(max_tx_size, xd, &cm->fc.tx_probs);
   for (n = TX_4X4; n <= max_tx_size; n++) {
     r[n][1] = r[n][0];
     if (r[n][0] == INT_MAX)
       continue;
     for (m = 0; m <= n - (n == max_tx_size); m++) {
       if (m == n)
         r[n][1] += vp9_cost_zero(tx_probs[m]);
       else
         r[n][1] += vp9_cost_one(tx_probs[m]);
     }
   }
   assert(skip_prob > 0);
   s0 = vp9_cost_bit(skip_prob, 0);
   s1 = vp9_cost_bit(skip_prob, 1);
   for (n = TX_4X4; n <= max_tx_size; n++) {
     if (d[n] == INT64_MAX) {
       rd[n][0] = rd[n][1] = INT64_MAX;
       continue;
     }
     if (s[n]) {
       rd[n][0] = rd[n][1] = RDCOST(x->rdmult, x->rddiv, s1, d[n]);
     } else {
       rd[n][0] = RDCOST(x->rdmult, x->rddiv, r[n][0] + s0, d[n]);
       rd[n][1] = RDCOST(x->rdmult, x->rddiv, r[n][1] + s0, d[n]);
     }
   }
   if (max_tx_size == TX_32X32 &&
       (cm->tx_mode == ALLOW_32X32 ||
        (cm->tx_mode == TX_MODE_SELECT &&
         rd[TX_32X32][1] < rd[TX_16X16][1] && rd[TX_32X32][1] < rd[TX_8X8][1] &&
         rd[TX_32X32][1] < rd[TX_4X4][1]))) {
     mbmi->tx_size = TX_32X32;
   } else if (max_tx_size >= TX_16X16 &&
              (cm->tx_mode == ALLOW_16X16 ||
               cm->tx_mode == ALLOW_32X32 ||
               (cm->tx_mode == TX_MODE_SELECT &&
                rd[TX_16X16][1] < rd[TX_8X8][1] &&
                rd[TX_16X16][1] < rd[TX_4X4][1]))) {
     mbmi->tx_size = TX_16X16;
   } else if (cm->tx_mode == ALLOW_8X8 ||
              cm->tx_mode == ALLOW_16X16 ||
              cm->tx_mode == ALLOW_32X32 ||
            (cm->tx_mode == TX_MODE_SELECT && rd[TX_8X8][1] < rd[TX_4X4][1])) {
     mbmi->tx_size = TX_8X8;
   } else {
     mbmi->tx_size = TX_4X4;
   }
   *distortion = d[mbmi->tx_size];
   *rate       = r[mbmi->tx_size][cm->tx_mode == TX_MODE_SELECT];
   *skip       = s[mbmi->tx_size];
   tx_cache[ONLY_4X4] = rd[TX_4X4][0];
   tx_cache[ALLOW_8X8] = rd[TX_8X8][0];
   tx_cache[ALLOW_16X16] = rd[MIN(max_tx_size, TX_16X16)][0];
   tx_cache[ALLOW_32X32] = rd[MIN(max_tx_size, TX_32X32)][0];
   if (max_tx_size == TX_32X32 &&
       rd[TX_32X32][1] < rd[TX_16X16][1] && rd[TX_32X32][1] < rd[TX_8X8][1] &&
       rd[TX_32X32][1] < rd[TX_4X4][1])
     tx_cache[TX_MODE_SELECT] = rd[TX_32X32][1];
   else if (max_tx_size >= TX_16X16 &&
            rd[TX_16X16][1] < rd[TX_8X8][1] && rd[TX_16X16][1] < rd[TX_4X4][1])
     tx_cache[TX_MODE_SELECT] = rd[TX_16X16][1];
   else
     tx_cache[TX_MODE_SELECT] = rd[TX_4X4][1] < rd[TX_8X8][1] ?
                                  rd[TX_4X4][1] : rd[TX_8X8][1];
   if (max_tx_size == TX_32X32 &&
       rd[TX_32X32][1] < rd[TX_16X16][1] &&
       rd[TX_32X32][1] < rd[TX_8X8][1] &&
       rd[TX_32X32][1] < rd[TX_4X4][1]) {
     cpi->tx_stepdown_count[0]++;
   } else if (max_tx_size >= TX_16X16 &&
              rd[TX_16X16][1] < rd[TX_8X8][1] &&
              rd[TX_16X16][1] < rd[TX_4X4][1]) {
     cpi->tx_stepdown_count[max_tx_size - TX_16X16]++;
   } else if (rd[TX_8X8][1] < rd[TX_4X4][1]) {
     cpi->tx_stepdown_count[max_tx_size - TX_8X8]++;
   } else {
     cpi->tx_stepdown_count[max_tx_size - TX_4X4]++;
   }
 }
 static void choose_txfm_size_from_modelrd(VP9_COMP *cpi, MACROBLOCK *x,
                                           int (*r)[2], int *rate,
                                           int64_t *d, int64_t *distortion,
                                           int *s, int *skip, int64_t *sse,
                                           int64_t ref_best_rd,
                                           BLOCK_SIZE bs) {
   const TX_SIZE max_tx_size = max_txsize_lookup[bs];
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   vp9_prob skip_prob = vp9_get_pred_prob_mbskip(cm, xd);
   int64_t rd[TX_SIZES][2];
   int n, m;
   int s0, s1;
   double scale_rd[TX_SIZES] = {1.73, 1.44, 1.20, 1.00};
   // double scale_r[TX_SIZES] = {2.82, 2.00, 1.41, 1.00};
   const vp9_prob *tx_probs = get_tx_probs2(max_tx_size, xd, &cm->fc.tx_probs);
   // for (n = TX_4X4; n <= max_txfm_size; n++)
   //   r[n][0] = (r[n][0] * scale_r[n]);
   for (n = TX_4X4; n <= max_tx_size; n++) {
     r[n][1] = r[n][0];
     for (m = 0; m <= n - (n == max_tx_size); m++) {
       if (m == n)
         r[n][1] += vp9_cost_zero(tx_probs[m]);
       else
         r[n][1] += vp9_cost_one(tx_probs[m]);
     }
   }
   assert(skip_prob > 0);
   s0 = vp9_cost_bit(skip_prob, 0);
   s1 = vp9_cost_bit(skip_prob, 1);
   for (n = TX_4X4; n <= max_tx_size; n++) {
     if (s[n]) {
       rd[n][0] = rd[n][1] = RDCOST(x->rdmult, x->rddiv, s1, d[n]);
     } else {
       rd[n][0] = RDCOST(x->rdmult, x->rddiv, r[n][0] + s0, d[n]);
       rd[n][1] = RDCOST(x->rdmult, x->rddiv, r[n][1] + s0, d[n]);
     }
   }
   for (n = TX_4X4; n <= max_tx_size; n++) {
     rd[n][0] = (int64_t)(scale_rd[n] * rd[n][0]);
     rd[n][1] = (int64_t)(scale_rd[n] * rd[n][1]);
   }
   if (max_tx_size == TX_32X32 &&
       (cm->tx_mode == ALLOW_32X32 ||
        (cm->tx_mode == TX_MODE_SELECT &&
         rd[TX_32X32][1] <= rd[TX_16X16][1] &&
         rd[TX_32X32][1] <= rd[TX_8X8][1] &&
         rd[TX_32X32][1] <= rd[TX_4X4][1]))) {
     mbmi->tx_size = TX_32X32;
   } else if (max_tx_size >= TX_16X16 &&
              (cm->tx_mode == ALLOW_16X16 ||
               cm->tx_mode == ALLOW_32X32 ||
               (cm->tx_mode == TX_MODE_SELECT &&
                rd[TX_16X16][1] <= rd[TX_8X8][1] &&
                rd[TX_16X16][1] <= rd[TX_4X4][1]))) {
     mbmi->tx_size = TX_16X16;
   } else if (cm->tx_mode == ALLOW_8X8 ||
              cm->tx_mode == ALLOW_16X16 ||
              cm->tx_mode == ALLOW_32X32 ||
            (cm->tx_mode == TX_MODE_SELECT &&
             rd[TX_8X8][1] <= rd[TX_4X4][1])) {
     mbmi->tx_size = TX_8X8;
   } else {
     mbmi->tx_size = TX_4X4;
   }
   // Actually encode using the chosen mode if a model was used, but do not
   // update the r, d costs
   txfm_rd_in_plane(x, &cpi->rdcost_stack, rate, distortion, skip,
                    &sse[mbmi->tx_size], ref_best_rd, 0, bs, mbmi->tx_size);
   if (max_tx_size == TX_32X32 &&
       rd[TX_32X32][1] <= rd[TX_16X16][1] &&
       rd[TX_32X32][1] <= rd[TX_8X8][1] &&
       rd[TX_32X32][1] <= rd[TX_4X4][1]) {
     cpi->tx_stepdown_count[0]++;
   } else if (max_tx_size >= TX_16X16 &&
              rd[TX_16X16][1] <= rd[TX_8X8][1] &&
              rd[TX_16X16][1] <= rd[TX_4X4][1]) {
     cpi->tx_stepdown_count[max_tx_size - TX_16X16]++;
   } else if (rd[TX_8X8][1] <= rd[TX_4X4][1]) {
     cpi->tx_stepdown_count[max_tx_size - TX_8X8]++;
   } else {
     cpi->tx_stepdown_count[max_tx_size - TX_4X4]++;
   }
 }
 static void super_block_yrd(VP9_COMP *cpi,
                             MACROBLOCK *x, int *rate, int64_t *distortion,
                             int *skip, int64_t *psse, BLOCK_SIZE bs,
                             int64_t txfm_cache[TX_MODES],
                             int64_t ref_best_rd) {
   int r[TX_SIZES][2], s[TX_SIZES];
   int64_t d[TX_SIZES], sse[TX_SIZES];
   MACROBLOCKD *xd = &x->e_mbd;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   struct rdcost_block_args *rdcost_stack = &cpi->rdcost_stack;
   const int b_inter_mode = is_inter_block(mbmi);
   assert(bs == mbmi->sb_type);
   if (b_inter_mode)
     vp9_subtract_sby(x, bs);
   if (cpi->sf.tx_size_search_method == USE_LARGESTALL ||
       (cpi->sf.tx_size_search_method != USE_FULL_RD &&
        !b_inter_mode)) {
     vpx_memset(txfm_cache, 0, TX_MODES * sizeof(int64_t));
     choose_largest_txfm_size(cpi, x, rate, distortion, skip, sse,
                              ref_best_rd, bs);
     if (psse)
       *psse = sse[mbmi->tx_size];
     return;
   }
   if (cpi->sf.tx_size_search_method == USE_LARGESTINTRA_MODELINTER &&
       b_inter_mode) {
     if (bs >= BLOCK_32X32)
       model_rd_for_sb_y_tx(cpi, bs, TX_32X32, x, xd,
                            &r[TX_32X32][0], &d[TX_32X32], &s[TX_32X32]);
     if (bs >= BLOCK_16X16)
       model_rd_for_sb_y_tx(cpi, bs, TX_16X16, x, xd,
                            &r[TX_16X16][0], &d[TX_16X16], &s[TX_16X16]);
     model_rd_for_sb_y_tx(cpi, bs, TX_8X8, x, xd,
                          &r[TX_8X8][0], &d[TX_8X8], &s[TX_8X8]);
     model_rd_for_sb_y_tx(cpi, bs, TX_4X4, x, xd,
                          &r[TX_4X4][0], &d[TX_4X4], &s[TX_4X4]);
     choose_txfm_size_from_modelrd(cpi, x, r, rate, d, distortion, s,
                                   skip, sse, ref_best_rd, bs);
   } else {
     if (bs >= BLOCK_32X32)
       txfm_rd_in_plane(x, rdcost_stack, &r[TX_32X32][0], &d[TX_32X32],
                        &s[TX_32X32], &sse[TX_32X32],
                        ref_best_rd, 0, bs, TX_32X32);
     if (bs >= BLOCK_16X16)
       txfm_rd_in_plane(x, rdcost_stack, &r[TX_16X16][0], &d[TX_16X16],
                        &s[TX_16X16], &sse[TX_16X16],
                        ref_best_rd, 0, bs, TX_16X16);
     txfm_rd_in_plane(x, rdcost_stack, &r[TX_8X8][0], &d[TX_8X8], &s[TX_8X8],
                      &sse[TX_8X8], ref_best_rd, 0, bs, TX_8X8);
     txfm_rd_in_plane(x, rdcost_stack, &r[TX_4X4][0], &d[TX_4X4], &s[TX_4X4],
                      &sse[TX_4X4], ref_best_rd, 0, bs, TX_4X4);
     choose_txfm_size_from_rd(cpi, x, r, rate, d, distortion, s,
                              skip, txfm_cache, bs);
   }
   if (psse)
     *psse = sse[mbmi->tx_size];
 }
 static int conditional_skipintra(MB_PREDICTION_MODE mode,
                                  MB_PREDICTION_MODE best_intra_mode) {
   if (mode == D117_PRED &&
       best_intra_mode != V_PRED &&
       best_intra_mode != D135_PRED)
     return 1;
   if (mode == D63_PRED &&
       best_intra_mode != V_PRED &&
       best_intra_mode != D45_PRED)
     return 1;
   if (mode == D207_PRED &&
       best_intra_mode != H_PRED &&
       best_intra_mode != D45_PRED)
     return 1;
   if (mode == D153_PRED &&
       best_intra_mode != H_PRED &&
       best_intra_mode != D135_PRED)
     return 1;
   return 0;
 }
 static int64_t rd_pick_intra4x4block(VP9_COMP *cpi, MACROBLOCK *x, int ib,
                                      MB_PREDICTION_MODE *best_mode,
                                      int *bmode_costs,
                                      ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l,
                                      int *bestrate, int *bestratey,
                                      int64_t *bestdistortion,
                                      BLOCK_SIZE bsize, int64_t rd_thresh) {
   MB_PREDICTION_MODE mode;
   MACROBLOCKD *xd = &x->e_mbd;
   int64_t best_rd = rd_thresh;
   int rate = 0;
   int64_t distortion;
   struct macroblock_plane *p = &x->plane[0];
   struct macroblockd_plane *pd = &xd->plane[0];
   const int src_stride = p->src.stride;
   const int dst_stride = pd->dst.stride;
   uint8_t *src_init = raster_block_offset_uint8(BLOCK_8X8, ib,
                                                 p->src.buf, src_stride);
   uint8_t *dst_init = raster_block_offset_uint8(BLOCK_8X8, ib,
                                                 pd->dst.buf, dst_stride);
   int16_t *src_diff, *coeff;
   ENTROPY_CONTEXT ta[2], tempa[2];
   ENTROPY_CONTEXT tl[2], templ[2];
   const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[bsize];
   const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[bsize];
   int idx, idy;
   uint8_t best_dst[8 * 8];
   assert(ib < 4);
   vpx_memcpy(ta, a, sizeof(ta));
   vpx_memcpy(tl, l, sizeof(tl));
   xd->mi_8x8[0]->mbmi.tx_size = TX_4X4;
   for (mode = DC_PRED; mode <= TM_PRED; ++mode) {
     int64_t this_rd;
     int ratey = 0;
     if (!(cpi->sf.intra_y_mode_mask[TX_4X4] & (1 << mode)))
       continue;
     // Only do the oblique modes if the best so far is
     // one of the neighboring directional modes
     if (cpi->sf.mode_search_skip_flags & FLAG_SKIP_INTRA_DIRMISMATCH) {
       if (conditional_skipintra(mode, *best_mode))
           continue;
     }
     rate = bmode_costs[mode];
     distortion = 0;
     vpx_memcpy(tempa, ta, sizeof(ta));
     vpx_memcpy(templ, tl, sizeof(tl));
     for (idy = 0; idy < num_4x4_blocks_high; ++idy) {
       for (idx = 0; idx < num_4x4_blocks_wide; ++idx) {
         int64_t ssz;
         const int16_t *scan;
         const int16_t *nb;
         uint8_t *src = src_init + idx * 4 + idy * 4 * src_stride;
         uint8_t *dst = dst_init + idx * 4 + idy * 4 * dst_stride;
         const int block = ib + idy * 2 + idx;
         TX_TYPE tx_type;
         xd->mi_8x8[0]->bmi[block].as_mode = mode;
         src_diff = raster_block_offset_int16(BLOCK_8X8, block, p->src_diff);
         coeff = BLOCK_OFFSET(x->plane[0].coeff, block);
         vp9_predict_intra_block(xd, block, 1,
                                 TX_4X4, mode,
                                 x->skip_encode ? src : dst,
                                 x->skip_encode ? src_stride : dst_stride,
                                 dst, dst_stride);
         vp9_subtract_block(4, 4, src_diff, 8,
                            src, src_stride,
                            dst, dst_stride);
         tx_type = get_tx_type_4x4(PLANE_TYPE_Y_WITH_DC, xd, block);
         get_scan_nb_4x4(tx_type, &scan, &nb);
         if (tx_type != DCT_DCT)
           vp9_short_fht4x4(src_diff, coeff, 8, tx_type);
         else
           x->fwd_txm4x4(src_diff, coeff, 8);
         vp9_regular_quantize_b_4x4(x, 4, block, scan, get_iscan_4x4(tx_type));
         ratey += cost_coeffs(x, 0, block,
                              tempa + idx, templ + idy, TX_4X4, scan, nb);
         distortion += vp9_block_error(coeff, BLOCK_OFFSET(pd->dqcoeff, block),
 , &ssz) >> 2;
         if (RDCOST(x->rdmult, x->rddiv, ratey, distortion) >= best_rd)
           goto next;
         if (tx_type != DCT_DCT)
           vp9_iht4x4_16_add(BLOCK_OFFSET(pd->dqcoeff, block),
                                dst, pd->dst.stride, tx_type);
         else
           xd->itxm_add(BLOCK_OFFSET(pd->dqcoeff, block), dst, pd->dst.stride,
 );
       }
     }
     rate += ratey;
     this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);
     if (this_rd < best_rd) {
       *bestrate = rate;
       *bestratey = ratey;
       *bestdistortion = distortion;
       best_rd = this_rd;
       *best_mode = mode;
       vpx_memcpy(a, tempa, sizeof(tempa));
       vpx_memcpy(l, templ, sizeof(templ));
       for (idy = 0; idy < num_4x4_blocks_high * 4; ++idy)
         vpx_memcpy(best_dst + idy * 8, dst_init + idy * dst_stride,
                    num_4x4_blocks_wide * 4);
     }
   next:
     {}
   }
   if (best_rd >= rd_thresh || x->skip_encode)
     return best_rd;
   for (idy = 0; idy < num_4x4_blocks_high * 4; ++idy)
     vpx_memcpy(dst_init + idy * dst_stride, best_dst + idy * 8,
                num_4x4_blocks_wide * 4);
   return best_rd;
 }
 static int64_t rd_pick_intra_sub_8x8_y_mode(VP9_COMP * const cpi,
                                             MACROBLOCK * const mb,
                                             int * const rate,
                                             int * const rate_y,
                                             int64_t * const distortion,
                                             int64_t best_rd) {
   int i, j;
   MACROBLOCKD *const xd = &mb->e_mbd;
   MODE_INFO *const mic = xd->mi_8x8[0];
   const MODE_INFO *above_mi = xd->mi_8x8[-xd->mode_info_stride];
   const MODE_INFO *left_mi = xd->left_available ? xd->mi_8x8[-1] : NULL;
   const BLOCK_SIZE bsize = xd->mi_8x8[0]->mbmi.sb_type;
   const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[bsize];
   const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[bsize];
   int idx, idy;
   int cost = 0;
   int64_t total_distortion = 0;
   int tot_rate_y = 0;
   int64_t total_rd = 0;
   ENTROPY_CONTEXT t_above[4], t_left[4];
   int *bmode_costs;
   vpx_memcpy(t_above, xd->plane[0].above_context, sizeof(t_above));
   vpx_memcpy(t_left, xd->plane[0].left_context, sizeof(t_left));
   bmode_costs = mb->mbmode_cost;
   // Pick modes for each sub-block (of size 4x4, 4x8, or 8x4) in an 8x8 block.
   for (idy = 0; idy < 2; idy += num_4x4_blocks_high) {
     for (idx = 0; idx < 2; idx += num_4x4_blocks_wide) {
       MB_PREDICTION_MODE best_mode = DC_PRED;
       int r = INT_MAX, ry = INT_MAX;
       int64_t d = INT64_MAX, this_rd = INT64_MAX;
       i = idy * 2 + idx;
       if (cpi->common.frame_type == KEY_FRAME) {
         const MB_PREDICTION_MODE A = above_block_mode(mic, above_mi, i);
         const MB_PREDICTION_MODE L = left_block_mode(mic, left_mi, i);
         bmode_costs  = mb->y_mode_costs[A][L];
       }
       this_rd = rd_pick_intra4x4block(cpi, mb, i, &best_mode, bmode_costs,
                                       t_above + idx, t_left + idy, &r, &ry, &d,
                                       bsize, best_rd - total_rd);
       if (this_rd >= best_rd - total_rd)
         return INT64_MAX;
       total_rd += this_rd;
       cost += r;
       total_distortion += d;
       tot_rate_y += ry;
       mic->bmi[i].as_mode = best_mode;
       for (j = 1; j < num_4x4_blocks_high; ++j)
         mic->bmi[i + j * 2].as_mode = best_mode;
       for (j = 1; j < num_4x4_blocks_wide; ++j)
         mic->bmi[i + j].as_mode = best_mode;
       if (total_rd >= best_rd)
         return INT64_MAX;
     }
   }
   *rate = cost;
   *rate_y = tot_rate_y;
   *distortion = total_distortion;
   mic->mbmi.mode = mic->bmi[3].as_mode;
   return RDCOST(mb->rdmult, mb->rddiv, cost, total_distortion);
 }
 static int64_t rd_pick_intra_sby_mode(VP9_COMP *cpi, MACROBLOCK *x,
                                       int *rate, int *rate_tokenonly,
                                       int64_t *distortion, int *skippable,
                                       BLOCK_SIZE bsize,
                                       int64_t tx_cache[TX_MODES],
                                       int64_t best_rd) {
   MB_PREDICTION_MODE mode;
   MB_PREDICTION_MODE mode_selected = DC_PRED;
   MACROBLOCKD *const xd = &x->e_mbd;
   MODE_INFO *const mic = xd->mi_8x8[0];
   int this_rate, this_rate_tokenonly, s;
   int64_t this_distortion, this_rd;
   TX_SIZE best_tx = TX_4X4;
   int i;
   int *bmode_costs = x->mbmode_cost;
   if (cpi->sf.tx_size_search_method == USE_FULL_RD)
     for (i = 0; i < TX_MODES; i++)
       tx_cache[i] = INT64_MAX;
   /* Y Search for intra prediction mode */
   for (mode = DC_PRED; mode <= TM_PRED; mode++) {
     int64_t local_tx_cache[TX_MODES];
     MODE_INFO *above_mi = xd->mi_8x8[-xd->mode_info_stride];
     MODE_INFO *left_mi = xd->left_available ? xd->mi_8x8[-1] : NULL;
     if (!(cpi->sf.intra_y_mode_mask[max_txsize_lookup[bsize]] & (1 << mode)))
       continue;
     if (cpi->common.frame_type == KEY_FRAME) {
       const MB_PREDICTION_MODE A = above_block_mode(mic, above_mi, 0);
       const MB_PREDICTION_MODE L = left_block_mode(mic, left_mi, 0);
       bmode_costs = x->y_mode_costs[A][L];
     }
     mic->mbmi.mode = mode;
     super_block_yrd(cpi, x, &this_rate_tokenonly, &this_distortion, &s, NULL,
                     bsize, local_tx_cache, best_rd);
     if (this_rate_tokenonly == INT_MAX)
       continue;
     this_rate = this_rate_tokenonly + bmode_costs[mode];
     this_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_distortion);
     if (this_rd < best_rd) {
       mode_selected   = mode;
       best_rd         = this_rd;
       best_tx         = mic->mbmi.tx_size;
       *rate           = this_rate;
       *rate_tokenonly = this_rate_tokenonly;
       *distortion     = this_distortion;
       *skippable      = s;
     }
     if (cpi->sf.tx_size_search_method == USE_FULL_RD && this_rd < INT64_MAX) {
       for (i = 0; i < TX_MODES && local_tx_cache[i] < INT64_MAX; i++) {
         const int64_t adj_rd = this_rd + local_tx_cache[i] -
             local_tx_cache[cpi->common.tx_mode];
         if (adj_rd < tx_cache[i]) {
           tx_cache[i] = adj_rd;
         }
       }
     }
   }
   mic->mbmi.mode = mode_selected;
   mic->mbmi.tx_size = best_tx;
   return best_rd;
 }
 static void super_block_uvrd(VP9_COMP *const cpi, MACROBLOCK *x,
                              int *rate, int64_t *distortion, int *skippable,
                              int64_t *sse, BLOCK_SIZE bsize,
                              int64_t ref_best_rd) {
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   TX_SIZE uv_txfm_size = get_uv_tx_size(mbmi);
   int plane;
   int pnrate = 0, pnskip = 1;
   int64_t pndist = 0, pnsse = 0;
   if (ref_best_rd < 0)
     goto term;
   if (is_inter_block(mbmi))
     vp9_subtract_sbuv(x, bsize);
   *rate = 0;
   *distortion = 0;
   *sse = 0;
   *skippable = 1;
   for (plane = 1; plane < MAX_MB_PLANE; ++plane) {
     txfm_rd_in_plane(x, &cpi->rdcost_stack, &pnrate, &pndist, &pnskip, &pnsse,
                      ref_best_rd, plane, bsize, uv_txfm_size);
     if (pnrate == INT_MAX)
       goto term;
     *rate += pnrate;
     *distortion += pndist;
     *sse += pnsse;
     *skippable &= pnskip;
   }
   return;
   term:
   *rate = INT_MAX;
   *distortion = INT64_MAX;
   *sse = INT64_MAX;
   *skippable = 0;
   return;
 }
 static int64_t rd_pick_intra_sbuv_mode(VP9_COMP *cpi, MACROBLOCK *x,
                                        PICK_MODE_CONTEXT *ctx,
                                        int *rate, int *rate_tokenonly,
                                        int64_t *distortion, int *skippable,
                                        BLOCK_SIZE bsize) {
   MB_PREDICTION_MODE mode;
   MB_PREDICTION_MODE mode_selected = DC_PRED;
   int64_t best_rd = INT64_MAX, this_rd;
   int this_rate_tokenonly, this_rate, s;
   int64_t this_distortion, this_sse;
   // int mode_mask = (bsize <= BLOCK_8X8)
   //                ? ALL_INTRA_MODES : cpi->sf.intra_uv_mode_mask;
   for (mode = DC_PRED; mode <= TM_PRED; mode ++) {
     // if (!(mode_mask & (1 << mode)))
     if (!(cpi->sf.intra_uv_mode_mask[max_uv_txsize_lookup[bsize]]
           & (1 << mode)))
       continue;
     x->e_mbd.mi_8x8[0]->mbmi.uv_mode = mode;
     super_block_uvrd(cpi, x, &this_rate_tokenonly,
                      &this_distortion, &s, &this_sse, bsize, best_rd);
     if (this_rate_tokenonly == INT_MAX)
       continue;
     this_rate = this_rate_tokenonly +
                 x->intra_uv_mode_cost[cpi->common.frame_type][mode];
     this_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_distortion);
     if (this_rd < best_rd) {
       mode_selected   = mode;
       best_rd         = this_rd;
       *rate           = this_rate;
       *rate_tokenonly = this_rate_tokenonly;
       *distortion     = this_distortion;
       *skippable      = s;
       if (!x->select_txfm_size) {
         int i;
         struct macroblock_plane *const p = x->plane;
         struct macroblockd_plane *const pd = x->e_mbd.plane;
         for (i = 1; i < MAX_MB_PLANE; ++i) {
           p[i].coeff    = ctx->coeff_pbuf[i][2];
           pd[i].qcoeff  = ctx->qcoeff_pbuf[i][2];
           pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][2];
           pd[i].eobs    = ctx->eobs_pbuf[i][2];
           ctx->coeff_pbuf[i][2]   = ctx->coeff_pbuf[i][0];
           ctx->qcoeff_pbuf[i][2]  = ctx->qcoeff_pbuf[i][0];
           ctx->dqcoeff_pbuf[i][2] = ctx->dqcoeff_pbuf[i][0];
           ctx->eobs_pbuf[i][2]    = ctx->eobs_pbuf[i][0];
           ctx->coeff_pbuf[i][0]   = p[i].coeff;
           ctx->qcoeff_pbuf[i][0]  = pd[i].qcoeff;
           ctx->dqcoeff_pbuf[i][0] = pd[i].dqcoeff;
           ctx->eobs_pbuf[i][0]    = pd[i].eobs;
         }
       }
     }
   }
   x->e_mbd.mi_8x8[0]->mbmi.uv_mode = mode_selected;
   return best_rd;
 }
 static int64_t rd_sbuv_dcpred(VP9_COMP *cpi, MACROBLOCK *x,
                               int *rate, int *rate_tokenonly,
                               int64_t *distortion, int *skippable,
                               BLOCK_SIZE bsize) {
   int64_t this_rd;
   int64_t this_sse;
   x->e_mbd.mi_8x8[0]->mbmi.uv_mode = DC_PRED;
   super_block_uvrd(cpi, x, rate_tokenonly, distortion,
                    skippable, &this_sse, bsize, INT64_MAX);
   *rate = *rate_tokenonly +
           x->intra_uv_mode_cost[cpi->common.frame_type][DC_PRED];
   this_rd = RDCOST(x->rdmult, x->rddiv, *rate, *distortion);
   return this_rd;
 }
 static void choose_intra_uv_mode(VP9_COMP *cpi, PICK_MODE_CONTEXT *ctx,
                                  BLOCK_SIZE bsize, int *rate_uv,
                                  int *rate_uv_tokenonly,
                                  int64_t *dist_uv, int *skip_uv,
                                  MB_PREDICTION_MODE *mode_uv) {
   MACROBLOCK *const x = &cpi->mb;
   // Use an estimated rd for uv_intra based on DC_PRED if the
   // appropriate speed flag is set.
   if (cpi->sf.use_uv_intra_rd_estimate) {
     rd_sbuv_dcpred(cpi, x, rate_uv, rate_uv_tokenonly, dist_uv, skip_uv,
                    bsize < BLOCK_8X8 ? BLOCK_8X8 : bsize);
   // Else do a proper rd search for each possible transform size that may
   // be considered in the main rd loop.
   } else {
     rd_pick_intra_sbuv_mode(cpi, x, ctx,
                             rate_uv, rate_uv_tokenonly, dist_uv, skip_uv,
                             bsize < BLOCK_8X8 ? BLOCK_8X8 : bsize);
   }
   *mode_uv = x->e_mbd.mi_8x8[0]->mbmi.uv_mode;
 }
 static int cost_mv_ref(VP9_COMP *cpi, MB_PREDICTION_MODE mode,
                        int mode_context) {
   MACROBLOCK *const x = &cpi->mb;
   MACROBLOCKD *const xd = &x->e_mbd;
   const int segment_id = xd->mi_8x8[0]->mbmi.segment_id;
   // Don't account for mode here if segment skip is enabled.
   if (!vp9_segfeature_active(&cpi->common.seg, segment_id, SEG_LVL_SKIP)) {
     assert(is_inter_mode(mode));
     return x->inter_mode_cost[mode_context][INTER_OFFSET(mode)];
   } else {
     return 0;
   }
 }
 void vp9_set_mbmode_and_mvs(MACROBLOCK *x, MB_PREDICTION_MODE mb, int_mv *mv) {
   x->e_mbd.mi_8x8[0]->mbmi.mode = mb;
   x->e_mbd.mi_8x8[0]->mbmi.mv[0].as_int = mv->as_int;
 }
 static void joint_motion_search(VP9_COMP *cpi, MACROBLOCK *x,
                                 BLOCK_SIZE bsize,
                                 int_mv *frame_mv,
                                 int mi_row, int mi_col,
                                 int_mv single_newmv[MAX_REF_FRAMES],
                                 int *rate_mv);
 static int labels2mode(MACROBLOCK *x, int i,
                        MB_PREDICTION_MODE this_mode,
                        int_mv *this_mv, int_mv *this_second_mv,
                        int_mv frame_mv[MB_MODE_COUNT][MAX_REF_FRAMES],
                        int_mv seg_mvs[MAX_REF_FRAMES],
                        int_mv *best_ref_mv,
                        int_mv *second_best_ref_mv,
                        int *mvjcost, int *mvcost[2], VP9_COMP *cpi) {
   MACROBLOCKD *const xd = &x->e_mbd;
   MODE_INFO *const mic = xd->mi_8x8[0];
   MB_MODE_INFO *mbmi = &mic->mbmi;
   int cost = 0, thismvcost = 0;
   int idx, idy;
   const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[mbmi->sb_type];
   const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[mbmi->sb_type];
   const int has_second_rf = has_second_ref(mbmi);
   /* We have to be careful retrieving previously-encoded motion vectors.
    Ones from this macroblock have to be pulled from the BLOCKD array
    as they have not yet made it to the bmi array in our MB_MODE_INFO. */
   MB_PREDICTION_MODE m;
   // the only time we should do costing for new motion vector or mode
   // is when we are on a new label  (jbb May 08, 2007)
   switch (m = this_mode) {
     case NEWMV:
       this_mv->as_int = seg_mvs[mbmi->ref_frame[0]].as_int;
       thismvcost  = vp9_mv_bit_cost(&this_mv->as_mv, &best_ref_mv->as_mv,
                                     mvjcost, mvcost, MV_COST_WEIGHT_SUB);
       if (has_second_rf) {
         this_second_mv->as_int = seg_mvs[mbmi->ref_frame[1]].as_int;
         thismvcost += vp9_mv_bit_cost(&this_second_mv->as_mv,
                                       &second_best_ref_mv->as_mv,
                                       mvjcost, mvcost, MV_COST_WEIGHT_SUB);
       }
       break;
     case NEARESTMV:
       this_mv->as_int = frame_mv[NEARESTMV][mbmi->ref_frame[0]].as_int;
       if (has_second_rf)
         this_second_mv->as_int =
             frame_mv[NEARESTMV][mbmi->ref_frame[1]].as_int;
       break;
     case NEARMV:
       this_mv->as_int = frame_mv[NEARMV][mbmi->ref_frame[0]].as_int;
       if (has_second_rf)
         this_second_mv->as_int =
             frame_mv[NEARMV][mbmi->ref_frame[1]].as_int;
       break;
     case ZEROMV:
       this_mv->as_int = 0;
       if (has_second_rf)
         this_second_mv->as_int = 0;
       break;
     default:
       break;
   }
   cost = cost_mv_ref(cpi, this_mode,
                      mbmi->mode_context[mbmi->ref_frame[0]]);
   mic->bmi[i].as_mv[0].as_int = this_mv->as_int;
   if (has_second_rf)
     mic->bmi[i].as_mv[1].as_int = this_second_mv->as_int;
   mic->bmi[i].as_mode = m;
   for (idy = 0; idy < num_4x4_blocks_high; ++idy)
     for (idx = 0; idx < num_4x4_blocks_wide; ++idx)
       vpx_memcpy(&mic->bmi[i + idy * 2 + idx],
                  &mic->bmi[i], sizeof(mic->bmi[i]));
   cost += thismvcost;
   return cost;
 }
 static int64_t encode_inter_mb_segment(VP9_COMP *cpi,
                                        MACROBLOCK *x,
                                        int64_t best_yrd,
                                        int i,
                                        int *labelyrate,
                                        int64_t *distortion, int64_t *sse,
                                        ENTROPY_CONTEXT *ta,
                                        ENTROPY_CONTEXT *tl) {
   int k;
   MACROBLOCKD *xd = &x->e_mbd;
   struct macroblockd_plane *const pd = &xd->plane[0];
   struct macroblock_plane *const p = &x->plane[0];
   MODE_INFO *const mi = xd->mi_8x8[0];
   const BLOCK_SIZE bsize = mi->mbmi.sb_type;
   const int width = plane_block_width(bsize, pd);
   const int height = plane_block_height(bsize, pd);
   int idx, idy;
   uint8_t *const src = raster_block_offset_uint8(BLOCK_8X8, i,
                                                  p->src.buf, p->src.stride);
   uint8_t *const dst = raster_block_offset_uint8(BLOCK_8X8, i,
                                                  pd->dst.buf, pd->dst.stride);
   int64_t thisdistortion = 0, thissse = 0;
   int thisrate = 0, ref;
   const int is_compound = has_second_ref(&mi->mbmi);
   for (ref = 0; ref < 1 + is_compound; ++ref) {
     const uint8_t *pre = raster_block_offset_uint8(BLOCK_8X8, i,
                                      pd->pre[ref].buf, pd->pre[ref].stride);
     vp9_build_inter_predictor(pre, pd->pre[ref].stride,
                               dst, pd->dst.stride,
                               &mi->bmi[i].as_mv[ref].as_mv,
                               &xd->scale_factor[ref],
                               width, height, ref, &xd->subpix, MV_PRECISION_Q3);
   }
   vp9_subtract_block(height, width,
                      raster_block_offset_int16(BLOCK_8X8, i, p->src_diff), 8,
                      src, p->src.stride,
                      dst, pd->dst.stride);
   k = i;
   for (idy = 0; idy < height / 4; ++idy) {
     for (idx = 0; idx < width / 4; ++idx) {
       int64_t ssz, rd, rd1, rd2;
       int16_t* coeff;
       k += (idy * 2 + idx);
       coeff = BLOCK_OFFSET(p->coeff, k);
       x->fwd_txm4x4(raster_block_offset_int16(BLOCK_8X8, k, p->src_diff),
                     coeff, 8);
       vp9_regular_quantize_b_4x4(x, 4, k, get_scan_4x4(DCT_DCT),
                                  get_iscan_4x4(DCT_DCT));
       thisdistortion += vp9_block_error(coeff, BLOCK_OFFSET(pd->dqcoeff, k),
 , &ssz);
       thissse += ssz;
       thisrate += cost_coeffs(x, 0, k,
                               ta + (k & 1),
                               tl + (k >> 1), TX_4X4,
                               vp9_default_scan_4x4,
                               vp9_default_scan_4x4_neighbors);
       rd1 = RDCOST(x->rdmult, x->rddiv, thisrate, thisdistortion >> 2);
       rd2 = RDCOST(x->rdmult, x->rddiv, 0, thissse >> 2);
       rd = MIN(rd1, rd2);
       if (rd >= best_yrd)
         return INT64_MAX;
     }
   }
   *distortion = thisdistortion >> 2;
   *labelyrate = thisrate;
   *sse = thissse >> 2;
   return RDCOST(x->rdmult, x->rddiv, *labelyrate, *distortion);
 }
 typedef struct {
   int eobs;
   int brate;
   int byrate;
   int64_t bdist;
   int64_t bsse;
   int64_t brdcost;
   int_mv mvs[2];
   ENTROPY_CONTEXT ta[2];
   ENTROPY_CONTEXT tl[2];
 } SEG_RDSTAT;
 typedef struct {
   int_mv *ref_mv, *second_ref_mv;
   int_mv mvp;
   int64_t segment_rd;
   int r;
   int64_t d;
   int64_t sse;
   int segment_yrate;
   MB_PREDICTION_MODE modes[4];
   SEG_RDSTAT rdstat[4][INTER_MODES];
   int mvthresh;
 } BEST_SEG_INFO;
 static INLINE int mv_check_bounds(MACROBLOCK *x, int_mv *mv) {
   int r = 0;
   r |= (mv->as_mv.row >> 3) < x->mv_row_min;
   r |= (mv->as_mv.row >> 3) > x->mv_row_max;
   r |= (mv->as_mv.col >> 3) < x->mv_col_min;
   r |= (mv->as_mv.col >> 3) > x->mv_col_max;
   return r;
 }
 static INLINE void mi_buf_shift(MACROBLOCK *x, int i) {
   MB_MODE_INFO *const mbmi = &x->e_mbd.mi_8x8[0]->mbmi;
   struct macroblock_plane *const p = &x->plane[0];
   struct macroblockd_plane *const pd = &x->e_mbd.plane[0];
   p->src.buf = raster_block_offset_uint8(BLOCK_8X8, i, p->src.buf,
                                          p->src.stride);
   assert(((intptr_t)pd->pre[0].buf & 0x7) == 0);
   pd->pre[0].buf = raster_block_offset_uint8(BLOCK_8X8, i, pd->pre[0].buf,
                                              pd->pre[0].stride);
   if (has_second_ref(mbmi))
     pd->pre[1].buf = raster_block_offset_uint8(BLOCK_8X8, i, pd->pre[1].buf,
                                                pd->pre[1].stride);
 }
 static INLINE void mi_buf_restore(MACROBLOCK *x, struct buf_2d orig_src,
                                   struct buf_2d orig_pre[2]) {
   MB_MODE_INFO *mbmi = &x->e_mbd.mi_8x8[0]->mbmi;
   x->plane[0].src = orig_src;
   x->e_mbd.plane[0].pre[0] = orig_pre[0];
   if (has_second_ref(mbmi))
     x->e_mbd.plane[0].pre[1] = orig_pre[1];
 }
 static void rd_check_segment_txsize(VP9_COMP *cpi, MACROBLOCK *x,
                                     const TileInfo *const tile,
                                     BEST_SEG_INFO *bsi_buf, int filter_idx,
                                     int_mv seg_mvs[4][MAX_REF_FRAMES],
                                     int mi_row, int mi_col) {
   int i, br = 0, idx, idy;
   int64_t bd = 0, block_sse = 0;
   MB_PREDICTION_MODE this_mode;
   MODE_INFO *mi = x->e_mbd.mi_8x8[0];
   MB_MODE_INFO *const mbmi = &mi->mbmi;
   struct macroblockd_plane *const pd = &x->e_mbd.plane[0];
   const int label_count = 4;
   int64_t this_segment_rd = 0;
   int label_mv_thresh;
   int segmentyrate = 0;
   const BLOCK_SIZE bsize = mbmi->sb_type;
   const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[bsize];
   const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[bsize];
   vp9_variance_fn_ptr_t *v_fn_ptr;
   ENTROPY_CONTEXT t_above[2], t_left[2];
   BEST_SEG_INFO *bsi = bsi_buf + filter_idx;
   int mode_idx;
   int subpelmv = 1, have_ref = 0;
   const int has_second_rf = has_second_ref(mbmi);
   vpx_memcpy(t_above, pd->above_context, sizeof(t_above));
   vpx_memcpy(t_left, pd->left_context, sizeof(t_left));
   v_fn_ptr = &cpi->fn_ptr[bsize];
   // 64 makes this threshold really big effectively
   // making it so that we very rarely check mvs on
   // segments.   setting this to 1 would make mv thresh
   // roughly equal to what it is for macroblocks
   label_mv_thresh = 1 * bsi->mvthresh / label_count;
   // Segmentation method overheads
   for (idy = 0; idy < 2; idy += num_4x4_blocks_high) {
     for (idx = 0; idx < 2; idx += num_4x4_blocks_wide) {
       // TODO(jingning,rbultje): rewrite the rate-distortion optimization
       // loop for 4x4/4x8/8x4 block coding. to be replaced with new rd loop
       int_mv mode_mv[MB_MODE_COUNT], second_mode_mv[MB_MODE_COUNT];
       int_mv frame_mv[MB_MODE_COUNT][MAX_REF_FRAMES];
       MB_PREDICTION_MODE mode_selected = ZEROMV;
       int64_t best_rd = INT64_MAX;
       i = idy * 2 + idx;
       frame_mv[ZEROMV][mbmi->ref_frame[0]].as_int = 0;
       vp9_append_sub8x8_mvs_for_idx(&cpi->common, &x->e_mbd, tile,
                                     &frame_mv[NEARESTMV][mbmi->ref_frame[0]],
                                     &frame_mv[NEARMV][mbmi->ref_frame[0]],
                                     i, 0, mi_row, mi_col);
       if (has_second_rf) {
         frame_mv[ZEROMV][mbmi->ref_frame[1]].as_int = 0;
         vp9_append_sub8x8_mvs_for_idx(&cpi->common, &x->e_mbd, tile,
                                       &frame_mv[NEARESTMV][mbmi->ref_frame[1]],
                                       &frame_mv[NEARMV][mbmi->ref_frame[1]],
                                       i, 1, mi_row, mi_col);
       }
       // search for the best motion vector on this segment
       for (this_mode = NEARESTMV; this_mode <= NEWMV; ++this_mode) {
         const struct buf_2d orig_src = x->plane[0].src;
         struct buf_2d orig_pre[2];
         mode_idx = INTER_OFFSET(this_mode);
         bsi->rdstat[i][mode_idx].brdcost = INT64_MAX;
         // if we're near/nearest and mv == 0,0, compare to zeromv
         if ((this_mode == NEARMV || this_mode == NEARESTMV ||
              this_mode == ZEROMV) &&
             frame_mv[this_mode][mbmi->ref_frame[0]].as_int == 0 &&
             (!has_second_rf ||
              frame_mv[this_mode][mbmi->ref_frame[1]].as_int == 0)) {
           int rfc = mbmi->mode_context[mbmi->ref_frame[0]];
           int c1 = cost_mv_ref(cpi, NEARMV, rfc);
           int c2 = cost_mv_ref(cpi, NEARESTMV, rfc);
           int c3 = cost_mv_ref(cpi, ZEROMV, rfc);
           if (this_mode == NEARMV) {
             if (c1 > c3)
               continue;
           } else if (this_mode == NEARESTMV) {
             if (c2 > c3)
               continue;
           } else {
             assert(this_mode == ZEROMV);
             if (!has_second_rf) {
               if ((c3 >= c2 &&
                    frame_mv[NEARESTMV][mbmi->ref_frame[0]].as_int == 0) ||
                   (c3 >= c1 &&
                    frame_mv[NEARMV][mbmi->ref_frame[0]].as_int == 0))
                 continue;
             } else {
               if ((c3 >= c2 &&
                    frame_mv[NEARESTMV][mbmi->ref_frame[0]].as_int == 0 &&
                    frame_mv[NEARESTMV][mbmi->ref_frame[1]].as_int == 0) ||
                   (c3 >= c1 &&
                    frame_mv[NEARMV][mbmi->ref_frame[0]].as_int == 0 &&
                    frame_mv[NEARMV][mbmi->ref_frame[1]].as_int == 0))
                 continue;
             }
           }
         }
         vpx_memcpy(orig_pre, pd->pre, sizeof(orig_pre));
         vpx_memcpy(bsi->rdstat[i][mode_idx].ta, t_above,
                    sizeof(bsi->rdstat[i][mode_idx].ta));
         vpx_memcpy(bsi->rdstat[i][mode_idx].tl, t_left,
                    sizeof(bsi->rdstat[i][mode_idx].tl));
         // motion search for newmv (single predictor case only)
         if (!has_second_rf && this_mode == NEWMV &&
             seg_mvs[i][mbmi->ref_frame[0]].as_int == INVALID_MV) {
           int step_param = 0;
           int further_steps;
           int thissme, bestsme = INT_MAX;
           int sadpb = x->sadperbit4;
           int_mv mvp_full;
           int max_mv;
           /* Is the best so far sufficiently good that we cant justify doing
            * and new motion search. */
           if (best_rd < label_mv_thresh)
             break;
           if (cpi->compressor_speed) {
             // use previous block's result as next block's MV predictor.
             if (i > 0) {
               bsi->mvp.as_int = mi->bmi[i - 1].as_mv[0].as_int;
               if (i == 2)
                 bsi->mvp.as_int = mi->bmi[i - 2].as_mv[0].as_int;
             }
           }
           if (i == 0)
             max_mv = x->max_mv_context[mbmi->ref_frame[0]];
           else
             max_mv = MAX(abs(bsi->mvp.as_mv.row), abs(bsi->mvp.as_mv.col)) >> 3;
           if (cpi->sf.auto_mv_step_size && cpi->common.show_frame) {
             // Take wtd average of the step_params based on the last frame's
             // max mv magnitude and the best ref mvs of the current block for
             // the given reference.
             step_param = (vp9_init_search_range(cpi, max_mv) +
                           cpi->mv_step_param) >> 1;
           } else {
             step_param = cpi->mv_step_param;
           }
           mvp_full.as_mv.row = bsi->mvp.as_mv.row >> 3;
           mvp_full.as_mv.col = bsi->mvp.as_mv.col >> 3;
           if (cpi->sf.adaptive_motion_search && cpi->common.show_frame) {
             mvp_full.as_mv.row = x->pred_mv[mbmi->ref_frame[0]].as_mv.row >> 3;
             mvp_full.as_mv.col = x->pred_mv[mbmi->ref_frame[0]].as_mv.col >> 3;
             step_param = MAX(step_param, 8);
           }
           further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;
           // adjust src pointer for this block
           mi_buf_shift(x, i);
           if (cpi->sf.search_method == HEX) {
             bestsme = vp9_hex_search(x, &mvp_full.as_mv,
                                      step_param,
                                      sadpb, 1, v_fn_ptr, 1,
                                      &bsi->ref_mv->as_mv,
                                      &mode_mv[NEWMV].as_mv);
           } else if (cpi->sf.search_method == SQUARE) {
             bestsme = vp9_square_search(x, &mvp_full.as_mv,
                                         step_param,
                                         sadpb, 1, v_fn_ptr, 1,
                                         &bsi->ref_mv->as_mv,
                                         &mode_mv[NEWMV].as_mv);
           } else if (cpi->sf.search_method == BIGDIA) {
             bestsme = vp9_bigdia_search(x, &mvp_full.as_mv,
                                         step_param,
                                         sadpb, 1, v_fn_ptr, 1,
                                         &bsi->ref_mv->as_mv,
                                         &mode_mv[NEWMV].as_mv);
           } else {
             bestsme = vp9_full_pixel_diamond(cpi, x, &mvp_full, step_param,
                                              sadpb, further_steps, 0, v_fn_ptr,
                                              bsi->ref_mv, &mode_mv[NEWMV]);
           }
           // Should we do a full search (best quality only)
           if (cpi->compressor_speed == 0) {
             /* Check if mvp_full is within the range. */
             clamp_mv(&mvp_full.as_mv, x->mv_col_min, x->mv_col_max,
                      x->mv_row_min, x->mv_row_max);
             thissme = cpi->full_search_sad(x, &mvp_full,
                                            sadpb, 16, v_fn_ptr,
                                            x->nmvjointcost, x->mvcost,
                                            bsi->ref_mv, i);
             if (thissme < bestsme) {
               bestsme = thissme;
               mode_mv[NEWMV].as_int = mi->bmi[i].as_mv[0].as_int;
             } else {
               /* The full search result is actually worse so re-instate the
                * previous best vector */
               mi->bmi[i].as_mv[0].as_int = mode_mv[NEWMV].as_int;
             }
           }
           if (bestsme < INT_MAX) {
             int distortion;
             unsigned int sse;
             cpi->find_fractional_mv_step(x,
                                          &mode_mv[NEWMV].as_mv,
                                          &bsi->ref_mv->as_mv,
                                          cpi->common.allow_high_precision_mv,
                                          x->errorperbit, v_fn_ptr,
 , cpi->sf.subpel_iters_per_step,
                                          x->nmvjointcost, x->mvcost,
                                          &distortion, &sse);
             // save motion search result for use in compound prediction
             seg_mvs[i][mbmi->ref_frame[0]].as_int = mode_mv[NEWMV].as_int;
           }
           if (cpi->sf.adaptive_motion_search)
             x->pred_mv[mbmi->ref_frame[0]].as_int = mode_mv[NEWMV].as_int;
           // restore src pointers
           mi_buf_restore(x, orig_src, orig_pre);
         }
         if (has_second_rf) {
           if (seg_mvs[i][mbmi->ref_frame[1]].as_int == INVALID_MV ||
               seg_mvs[i][mbmi->ref_frame[0]].as_int == INVALID_MV)
             continue;
         }
         if (has_second_rf && this_mode == NEWMV &&
             mbmi->interp_filter == EIGHTTAP) {
           // adjust src pointers
           mi_buf_shift(x, i);
           if (cpi->sf.comp_inter_joint_search_thresh <= bsize) {
             int rate_mv;
             joint_motion_search(cpi, x, bsize, frame_mv[this_mode],
                                 mi_row, mi_col, seg_mvs[i],
                                 &rate_mv);
             seg_mvs[i][mbmi->ref_frame[0]].as_int =
                 frame_mv[this_mode][mbmi->ref_frame[0]].as_int;
             seg_mvs[i][mbmi->ref_frame[1]].as_int =
                 frame_mv[this_mode][mbmi->ref_frame[1]].as_int;
           }
           // restore src pointers
           mi_buf_restore(x, orig_src, orig_pre);
         }
         bsi->rdstat[i][mode_idx].brate =
             labels2mode(x, i, this_mode, &mode_mv[this_mode],
                         &second_mode_mv[this_mode], frame_mv, seg_mvs[i],
                         bsi->ref_mv, bsi->second_ref_mv, x->nmvjointcost,
                         x->mvcost, cpi);
         bsi->rdstat[i][mode_idx].mvs[0].as_int = mode_mv[this_mode].as_int;
         if (num_4x4_blocks_wide > 1)
           bsi->rdstat[i + 1][mode_idx].mvs[0].as_int =
               mode_mv[this_mode].as_int;
         if (num_4x4_blocks_high > 1)
           bsi->rdstat[i + 2][mode_idx].mvs[0].as_int =
               mode_mv[this_mode].as_int;
         if (has_second_rf) {
           bsi->rdstat[i][mode_idx].mvs[1].as_int =
               second_mode_mv[this_mode].as_int;
           if (num_4x4_blocks_wide > 1)
             bsi->rdstat[i + 1][mode_idx].mvs[1].as_int =
                 second_mode_mv[this_mode].as_int;
           if (num_4x4_blocks_high > 1)
             bsi->rdstat[i + 2][mode_idx].mvs[1].as_int =
                 second_mode_mv[this_mode].as_int;
         }
         // Trap vectors that reach beyond the UMV borders
         if (mv_check_bounds(x, &mode_mv[this_mode]))
           continue;
         if (has_second_rf &&
             mv_check_bounds(x, &second_mode_mv[this_mode]))
           continue;
         if (filter_idx > 0) {
           BEST_SEG_INFO *ref_bsi = bsi_buf;
           subpelmv = (mode_mv[this_mode].as_mv.row & 0x0f) ||
                      (mode_mv[this_mode].as_mv.col & 0x0f);
           have_ref = mode_mv[this_mode].as_int ==
                      ref_bsi->rdstat[i][mode_idx].mvs[0].as_int;
           if (has_second_rf) {
             subpelmv |= (second_mode_mv[this_mode].as_mv.row & 0x0f) ||
                         (second_mode_mv[this_mode].as_mv.col & 0x0f);
             have_ref  &= second_mode_mv[this_mode].as_int ==
                          ref_bsi->rdstat[i][mode_idx].mvs[1].as_int;
           }
           if (filter_idx > 1 && !subpelmv && !have_ref) {
             ref_bsi = bsi_buf + 1;
             have_ref = mode_mv[this_mode].as_int ==
                        ref_bsi->rdstat[i][mode_idx].mvs[0].as_int;
             if (has_second_rf) {
               have_ref  &= second_mode_mv[this_mode].as_int ==
                            ref_bsi->rdstat[i][mode_idx].mvs[1].as_int;
             }
           }
           if (!subpelmv && have_ref &&
               ref_bsi->rdstat[i][mode_idx].brdcost < INT64_MAX) {
             vpx_memcpy(&bsi->rdstat[i][mode_idx], &ref_bsi->rdstat[i][mode_idx],
                        sizeof(SEG_RDSTAT));
             if (num_4x4_blocks_wide > 1)
               bsi->rdstat[i + 1][mode_idx].eobs =
                   ref_bsi->rdstat[i + 1][mode_idx].eobs;
             if (num_4x4_blocks_high > 1)
               bsi->rdstat[i + 2][mode_idx].eobs =
                   ref_bsi->rdstat[i + 2][mode_idx].eobs;
             if (bsi->rdstat[i][mode_idx].brdcost < best_rd) {
               mode_selected = this_mode;
               best_rd = bsi->rdstat[i][mode_idx].brdcost;
             }
             continue;
           }
         }
         bsi->rdstat[i][mode_idx].brdcost =
             encode_inter_mb_segment(cpi, x,
                                     bsi->segment_rd - this_segment_rd, i,
                                     &bsi->rdstat[i][mode_idx].byrate,
                                     &bsi->rdstat[i][mode_idx].bdist,
                                     &bsi->rdstat[i][mode_idx].bsse,
                                     bsi->rdstat[i][mode_idx].ta,
                                     bsi->rdstat[i][mode_idx].tl);
         if (bsi->rdstat[i][mode_idx].brdcost < INT64_MAX) {
           bsi->rdstat[i][mode_idx].brdcost += RDCOST(x->rdmult, x->rddiv,
                                             bsi->rdstat[i][mode_idx].brate, 0);
           bsi->rdstat[i][mode_idx].brate += bsi->rdstat[i][mode_idx].byrate;
           bsi->rdstat[i][mode_idx].eobs = pd->eobs[i];
           if (num_4x4_blocks_wide > 1)
             bsi->rdstat[i + 1][mode_idx].eobs = pd->eobs[i + 1];
           if (num_4x4_blocks_high > 1)
             bsi->rdstat[i + 2][mode_idx].eobs = pd->eobs[i + 2];
         }
         if (bsi->rdstat[i][mode_idx].brdcost < best_rd) {
           mode_selected = this_mode;
           best_rd = bsi->rdstat[i][mode_idx].brdcost;
         }
       } /*for each 4x4 mode*/
       if (best_rd == INT64_MAX) {
         int iy, midx;
         for (iy = i + 1; iy < 4; ++iy)
           for (midx = 0; midx < INTER_MODES; ++midx)
             bsi->rdstat[iy][midx].brdcost = INT64_MAX;
         bsi->segment_rd = INT64_MAX;
         return;
       }
       mode_idx = INTER_OFFSET(mode_selected);
       vpx_memcpy(t_above, bsi->rdstat[i][mode_idx].ta, sizeof(t_above));
       vpx_memcpy(t_left, bsi->rdstat[i][mode_idx].tl, sizeof(t_left));
       labels2mode(x, i, mode_selected, &mode_mv[mode_selected],
                   &second_mode_mv[mode_selected], frame_mv, seg_mvs[i],
                   bsi->ref_mv, bsi->second_ref_mv, x->nmvjointcost,
                   x->mvcost, cpi);
       br += bsi->rdstat[i][mode_idx].brate;
       bd += bsi->rdstat[i][mode_idx].bdist;
       block_sse += bsi->rdstat[i][mode_idx].bsse;
       segmentyrate += bsi->rdstat[i][mode_idx].byrate;
       this_segment_rd += bsi->rdstat[i][mode_idx].brdcost;
       if (this_segment_rd > bsi->segment_rd) {
         int iy, midx;
         for (iy = i + 1; iy < 4; ++iy)
           for (midx = 0; midx < INTER_MODES; ++midx)
             bsi->rdstat[iy][midx].brdcost = INT64_MAX;
         bsi->segment_rd = INT64_MAX;
         return;
       }
     }
   } /* for each label */
   bsi->r = br;
   bsi->d = bd;
   bsi->segment_yrate = segmentyrate;
   bsi->segment_rd = this_segment_rd;
   bsi->sse = block_sse;
   // update the coding decisions
   for (i = 0; i < 4; ++i)
     bsi->modes[i] = mi->bmi[i].as_mode;
 }
 static int64_t rd_pick_best_mbsegmentation(VP9_COMP *cpi, MACROBLOCK *x,
                                            const TileInfo *const tile,
                                            int_mv *best_ref_mv,
                                            int_mv *second_best_ref_mv,
                                            int64_t best_rd,
                                            int *returntotrate,
                                            int *returnyrate,
                                            int64_t *returndistortion,
                                            int *skippable, int64_t *psse,
                                            int mvthresh,
                                            int_mv seg_mvs[4][MAX_REF_FRAMES],
                                            BEST_SEG_INFO *bsi_buf,
                                            int filter_idx,
                                            int mi_row, int mi_col) {
   int i;
   BEST_SEG_INFO *bsi = bsi_buf + filter_idx;
   MACROBLOCKD *xd = &x->e_mbd;
   MODE_INFO *mi = xd->mi_8x8[0];
   MB_MODE_INFO *mbmi = &mi->mbmi;
   int mode_idx;
   vp9_zero(*bsi);
   bsi->segment_rd = best_rd;
   bsi->ref_mv = best_ref_mv;
   bsi->second_ref_mv = second_best_ref_mv;
   bsi->mvp.as_int = best_ref_mv->as_int;
   bsi->mvthresh = mvthresh;
   for (i = 0; i < 4; i++)
     bsi->modes[i] = ZEROMV;
   rd_check_segment_txsize(cpi, x, tile, bsi_buf, filter_idx, seg_mvs,
                           mi_row, mi_col);
   if (bsi->segment_rd > best_rd)
     return INT64_MAX;
   /* set it to the best */
   for (i = 0; i < 4; i++) {
     mode_idx = INTER_OFFSET(bsi->modes[i]);
     mi->bmi[i].as_mv[0].as_int = bsi->rdstat[i][mode_idx].mvs[0].as_int;
     if (has_second_ref(mbmi))
       mi->bmi[i].as_mv[1].as_int = bsi->rdstat[i][mode_idx].mvs[1].as_int;
     xd->plane[0].eobs[i] = bsi->rdstat[i][mode_idx].eobs;
     mi->bmi[i].as_mode = bsi->modes[i];
   }
   /*
    * used to set mbmi->mv.as_int
    */
   *returntotrate = bsi->r;
   *returndistortion = bsi->d;
   *returnyrate = bsi->segment_yrate;
   *skippable = vp9_is_skippable_in_plane(&x->e_mbd, BLOCK_8X8, 0);
   *psse = bsi->sse;
   mbmi->mode = bsi->modes[3];
   return bsi->segment_rd;
 }
 static void mv_pred(VP9_COMP *cpi, MACROBLOCK *x,
                     uint8_t *ref_y_buffer, int ref_y_stride,
                     int ref_frame, BLOCK_SIZE block_size ) {
   MACROBLOCKD *xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   int_mv this_mv;
   int i;
   int zero_seen = 0;
   int best_index = 0;
   int best_sad = INT_MAX;
   int this_sad = INT_MAX;
   unsigned int max_mv = 0;
   uint8_t *src_y_ptr = x->plane[0].src.buf;
   uint8_t *ref_y_ptr;
   int row_offset, col_offset;
   int num_mv_refs = MAX_MV_REF_CANDIDATES +
                     (cpi->sf.adaptive_motion_search &&
                      cpi->common.show_frame &&
                      block_size < cpi->sf.max_partition_size);
   // Get the sad for each candidate reference mv
   for (i = 0; i < num_mv_refs; i++) {
     this_mv.as_int = (i < MAX_MV_REF_CANDIDATES) ?
         mbmi->ref_mvs[ref_frame][i].as_int : x->pred_mv[ref_frame].as_int;
     max_mv = MAX(max_mv,
                  MAX(abs(this_mv.as_mv.row), abs(this_mv.as_mv.col)) >> 3);
     // The list is at an end if we see 0 for a second time.
     if (!this_mv.as_int && zero_seen)
       break;
     zero_seen = zero_seen || !this_mv.as_int;
     row_offset = this_mv.as_mv.row >> 3;
     col_offset = this_mv.as_mv.col >> 3;
     ref_y_ptr = ref_y_buffer + (ref_y_stride * row_offset) + col_offset;
     // Find sad for current vector.
     this_sad = cpi->fn_ptr[block_size].sdf(src_y_ptr, x->plane[0].src.stride,
                                            ref_y_ptr, ref_y_stride,
 x7fffffff);
     // Note if it is the best so far.
     if (this_sad < best_sad) {
       best_sad = this_sad;
       best_index = i;
     }
   }
   // Note the index of the mv that worked best in the reference list.
   x->mv_best_ref_index[ref_frame] = best_index;
   x->max_mv_context[ref_frame] = max_mv;
 }
 static void estimate_ref_frame_costs(VP9_COMP *cpi, int segment_id,
                                      unsigned int *ref_costs_single,
                                      unsigned int *ref_costs_comp,
                                      vp9_prob *comp_mode_p) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCKD *const xd = &cpi->mb.e_mbd;
   int seg_ref_active = vp9_segfeature_active(&cm->seg, segment_id,
                                              SEG_LVL_REF_FRAME);
   if (seg_ref_active) {
     vpx_memset(ref_costs_single, 0, MAX_REF_FRAMES * sizeof(*ref_costs_single));
     vpx_memset(ref_costs_comp,   0, MAX_REF_FRAMES * sizeof(*ref_costs_comp));
     *comp_mode_p = 128;
   } else {
     vp9_prob intra_inter_p = vp9_get_pred_prob_intra_inter(cm, xd);
     vp9_prob comp_inter_p = 128;
     if (cm->comp_pred_mode == HYBRID_PREDICTION) {
       comp_inter_p = vp9_get_pred_prob_comp_inter_inter(cm, xd);
       *comp_mode_p = comp_inter_p;
     } else {
       *comp_mode_p = 128;
     }
     ref_costs_single[INTRA_FRAME] = vp9_cost_bit(intra_inter_p, 0);
     if (cm->comp_pred_mode != COMP_PREDICTION_ONLY) {
       vp9_prob ref_single_p1 = vp9_get_pred_prob_single_ref_p1(cm, xd);
       vp9_prob ref_single_p2 = vp9_get_pred_prob_single_ref_p2(cm, xd);
       unsigned int base_cost = vp9_cost_bit(intra_inter_p, 1);
       if (cm->comp_pred_mode == HYBRID_PREDICTION)
         base_cost += vp9_cost_bit(comp_inter_p, 0);
       ref_costs_single[LAST_FRAME] = ref_costs_single[GOLDEN_FRAME] =
           ref_costs_single[ALTREF_FRAME] = base_cost;
       ref_costs_single[LAST_FRAME]   += vp9_cost_bit(ref_single_p1, 0);
       ref_costs_single[GOLDEN_FRAME] += vp9_cost_bit(ref_single_p1, 1);
       ref_costs_single[ALTREF_FRAME] += vp9_cost_bit(ref_single_p1, 1);
       ref_costs_single[GOLDEN_FRAME] += vp9_cost_bit(ref_single_p2, 0);
       ref_costs_single[ALTREF_FRAME] += vp9_cost_bit(ref_single_p2, 1);
     } else {
       ref_costs_single[LAST_FRAME]   = 512;
       ref_costs_single[GOLDEN_FRAME] = 512;
       ref_costs_single[ALTREF_FRAME] = 512;
     }
     if (cm->comp_pred_mode != SINGLE_PREDICTION_ONLY) {
       vp9_prob ref_comp_p = vp9_get_pred_prob_comp_ref_p(cm, xd);
       unsigned int base_cost = vp9_cost_bit(intra_inter_p, 1);
       if (cm->comp_pred_mode == HYBRID_PREDICTION)
         base_cost += vp9_cost_bit(comp_inter_p, 1);
       ref_costs_comp[LAST_FRAME]   = base_cost + vp9_cost_bit(ref_comp_p, 0);
       ref_costs_comp[GOLDEN_FRAME] = base_cost + vp9_cost_bit(ref_comp_p, 1);
     } else {
       ref_costs_comp[LAST_FRAME]   = 512;
       ref_costs_comp[GOLDEN_FRAME] = 512;
     }
   }
 }
 static void store_coding_context(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx,
                          int mode_index,
                          int_mv *ref_mv,
                          int_mv *second_ref_mv,
                          int64_t comp_pred_diff[NB_PREDICTION_TYPES],
                          int64_t tx_size_diff[TX_MODES],
                          int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS]) {
   MACROBLOCKD *const xd = &x->e_mbd;
   // Take a snapshot of the coding context so it can be
   // restored if we decide to encode this way
   ctx->skip = x->skip;
   ctx->best_mode_index = mode_index;
   ctx->mic = *xd->mi_8x8[0];
   ctx->best_ref_mv.as_int = ref_mv->as_int;
   ctx->second_best_ref_mv.as_int = second_ref_mv->as_int;
   ctx->single_pred_diff = (int)comp_pred_diff[SINGLE_PREDICTION_ONLY];
   ctx->comp_pred_diff   = (int)comp_pred_diff[COMP_PREDICTION_ONLY];
   ctx->hybrid_pred_diff = (int)comp_pred_diff[HYBRID_PREDICTION];
   vpx_memcpy(ctx->tx_rd_diff, tx_size_diff, sizeof(ctx->tx_rd_diff));
   vpx_memcpy(ctx->best_filter_diff, best_filter_diff,
              sizeof(*best_filter_diff) * SWITCHABLE_FILTER_CONTEXTS);
 }
 static void setup_pred_block(const MACROBLOCKD *xd,
                              struct buf_2d dst[MAX_MB_PLANE],
                              const YV12_BUFFER_CONFIG *src,
                              int mi_row, int mi_col,
                              const struct scale_factors *scale,
                              const struct scale_factors *scale_uv) {
   int i;
   dst[0].buf = src->y_buffer;
   dst[0].stride = src->y_stride;
   dst[1].buf = src->u_buffer;
   dst[2].buf = src->v_buffer;
   dst[1].stride = dst[2].stride = src->uv_stride;
 #if CONFIG_ALPHA
   dst[3].buf = src->alpha_buffer;
   dst[3].stride = src->alpha_stride;
 #endif
   // TODO(jkoleszar): Make scale factors per-plane data
   for (i = 0; i < MAX_MB_PLANE; i++) {
     setup_pred_plane(dst + i, dst[i].buf, dst[i].stride, mi_row, mi_col,
                      i ? scale_uv : scale,
                      xd->plane[i].subsampling_x, xd->plane[i].subsampling_y);
   }
 }
 static void setup_buffer_inter(VP9_COMP *cpi, MACROBLOCK *x,
                                const TileInfo *const tile,
                                int idx, MV_REFERENCE_FRAME frame_type,
                                BLOCK_SIZE block_size,
                                int mi_row, int mi_col,
                                int_mv frame_nearest_mv[MAX_REF_FRAMES],
                                int_mv frame_near_mv[MAX_REF_FRAMES],
                                struct buf_2d yv12_mb[4][MAX_MB_PLANE],
                                struct scale_factors scale[MAX_REF_FRAMES]) {
   VP9_COMMON *cm = &cpi->common;
   YV12_BUFFER_CONFIG *yv12 = &cm->yv12_fb[cpi->common.ref_frame_map[idx]];
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   // set up scaling factors
   scale[frame_type] = cpi->common.active_ref_scale[frame_type - 1];
   scale[frame_type].sfc->set_scaled_offsets(&scale[frame_type],
                                             mi_row * MI_SIZE, mi_col * MI_SIZE);
   // TODO(jkoleszar): Is the UV buffer ever used here? If so, need to make this
   // use the UV scaling factors.
   setup_pred_block(xd, yv12_mb[frame_type], yv12, mi_row, mi_col,
                    &scale[frame_type], &scale[frame_type]);
   // Gets an initial list of candidate vectors from neighbours and orders them
   vp9_find_mv_refs(cm, xd, tile, xd->mi_8x8[0],
                    xd->last_mi,
                    frame_type,
                    mbmi->ref_mvs[frame_type], mi_row, mi_col);
   // Candidate refinement carried out at encoder and decoder
   vp9_find_best_ref_mvs(xd, cm->allow_high_precision_mv,
                         mbmi->ref_mvs[frame_type],
                         &frame_nearest_mv[frame_type],
                         &frame_near_mv[frame_type]);
   // Further refinement that is encode side only to test the top few candidates
   // in full and choose the best as the centre point for subsequent searches.
   // The current implementation doesn't support scaling.
   if (!vp9_is_scaled(scale[frame_type].sfc) && block_size >= BLOCK_8X8)
     mv_pred(cpi, x, yv12_mb[frame_type][0].buf, yv12->y_stride,
             frame_type, block_size);
 }
 static YV12_BUFFER_CONFIG *get_scaled_ref_frame(VP9_COMP *cpi, int ref_frame) {
   YV12_BUFFER_CONFIG *scaled_ref_frame = NULL;
   int fb = get_ref_frame_idx(cpi, ref_frame);
   int fb_scale = get_scale_ref_frame_idx(cpi, ref_frame);
   if (cpi->scaled_ref_idx[fb_scale] != cpi->common.ref_frame_map[fb])
     scaled_ref_frame = &cpi->common.yv12_fb[cpi->scaled_ref_idx[fb_scale]];
   return scaled_ref_frame;
 }
 static INLINE int get_switchable_rate(const MACROBLOCK *x) {
   const MACROBLOCKD *const xd = &x->e_mbd;
   const MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   const int ctx = vp9_get_pred_context_switchable_interp(xd);
   return SWITCHABLE_INTERP_RATE_FACTOR *
              x->switchable_interp_costs[ctx][mbmi->interp_filter];
 }
 static void single_motion_search(VP9_COMP *cpi, MACROBLOCK *x,
                                  const TileInfo *const tile,
                                  BLOCK_SIZE bsize,
                                  int mi_row, int mi_col,
                                  int_mv *tmp_mv, int *rate_mv) {
   MACROBLOCKD *xd = &x->e_mbd;
   VP9_COMMON *cm = &cpi->common;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   struct buf_2d backup_yv12[MAX_MB_PLANE] = {{0}};
   int bestsme = INT_MAX;
   int further_steps, step_param;
   int sadpb = x->sadperbit16;
   int_mv mvp_full;
   int ref = mbmi->ref_frame[0];
   int_mv ref_mv = mbmi->ref_mvs[ref][0];
   const BLOCK_SIZE block_size = get_plane_block_size(bsize, &xd->plane[0]);
   int tmp_col_min = x->mv_col_min;
   int tmp_col_max = x->mv_col_max;
   int tmp_row_min = x->mv_row_min;
   int tmp_row_max = x->mv_row_max;
   YV12_BUFFER_CONFIG *scaled_ref_frame = get_scaled_ref_frame(cpi, ref);
   if (scaled_ref_frame) {
     int i;
     // Swap out the reference frame for a version that's been scaled to
     // match the resolution of the current frame, allowing the existing
     // motion search code to be used without additional modifications.
     for (i = 0; i < MAX_MB_PLANE; i++)
       backup_yv12[i] = xd->plane[i].pre[0];
     setup_pre_planes(xd, 0, scaled_ref_frame, mi_row, mi_col, NULL);
   }
   vp9_clamp_mv_min_max(x, &ref_mv.as_mv);
   // Adjust search parameters based on small partitions' result.
   if (x->fast_ms) {
     // && abs(mvp_full.as_mv.row - x->pred_mv.as_mv.row) < 24 &&
     // abs(mvp_full.as_mv.col - x->pred_mv.as_mv.col) < 24) {
     // adjust search range
     step_param = 6;
     if (x->fast_ms > 1)
       step_param = 8;
     // Get prediction MV.
     mvp_full.as_int = x->pred_mv[ref].as_int;
     // Adjust MV sign if needed.
     if (cm->ref_frame_sign_bias[ref]) {
       mvp_full.as_mv.col *= -1;
       mvp_full.as_mv.row *= -1;
     }
   } else {
     // Work out the size of the first step in the mv step search.
     // 0 here is maximum length first step. 1 is MAX >> 1 etc.
     if (cpi->sf.auto_mv_step_size && cpi->common.show_frame) {
       // Take wtd average of the step_params based on the last frame's
       // max mv magnitude and that based on the best ref mvs of the current
       // block for the given reference.
       step_param = (vp9_init_search_range(cpi, x->max_mv_context[ref]) +
                     cpi->mv_step_param) >> 1;
     } else {
       step_param = cpi->mv_step_param;
     }
   }
   if (cpi->sf.adaptive_motion_search && bsize < BLOCK_64X64 &&
       cpi->common.show_frame) {
     int boffset = 2 * (b_width_log2(BLOCK_64X64) - MIN(b_height_log2(bsize),
                                                        b_width_log2(bsize)));
     step_param = MAX(step_param, boffset);
   }
   mvp_full.as_int = x->mv_best_ref_index[ref] < MAX_MV_REF_CANDIDATES ?
       mbmi->ref_mvs[ref][x->mv_best_ref_index[ref]].as_int :
       x->pred_mv[ref].as_int;
   mvp_full.as_mv.col >>= 3;
   mvp_full.as_mv.row >>= 3;
   // Further step/diamond searches as necessary
   further_steps = (cpi->sf.max_step_search_steps - 1) - step_param;
   if (cpi->sf.search_method == HEX) {
     bestsme = vp9_hex_search(x, &mvp_full.as_mv,
                              step_param,
                              sadpb, 1,
                              &cpi->fn_ptr[block_size], 1,
                              &ref_mv.as_mv, &tmp_mv->as_mv);
   } else if (cpi->sf.search_method == SQUARE) {
     bestsme = vp9_square_search(x, &mvp_full.as_mv,
                                 step_param,
                                 sadpb, 1,
                                 &cpi->fn_ptr[block_size], 1,
                                 &ref_mv.as_mv, &tmp_mv->as_mv);
   } else if (cpi->sf.search_method == BIGDIA) {
     bestsme = vp9_bigdia_search(x, &mvp_full.as_mv,
                                 step_param,
                                 sadpb, 1,
                                 &cpi->fn_ptr[block_size], 1,
                                 &ref_mv.as_mv, &tmp_mv->as_mv);
   } else {
     bestsme = vp9_full_pixel_diamond(cpi, x, &mvp_full, step_param,
                                      sadpb, further_steps, 1,
                                      &cpi->fn_ptr[block_size],
                                      &ref_mv, tmp_mv);
   }
   x->mv_col_min = tmp_col_min;
   x->mv_col_max = tmp_col_max;
   x->mv_row_min = tmp_row_min;
   x->mv_row_max = tmp_row_max;
   if (bestsme < INT_MAX) {
     int dis;  /* TODO: use dis in distortion calculation later. */
     unsigned int sse;
     cpi->find_fractional_mv_step(x, &tmp_mv->as_mv, &ref_mv.as_mv,
                                  cm->allow_high_precision_mv,
                                  x->errorperbit,
                                  &cpi->fn_ptr[block_size],
 , cpi->sf.subpel_iters_per_step,
                                  x->nmvjointcost, x->mvcost,
                                  &dis, &sse);
   }
   *rate_mv = vp9_mv_bit_cost(&tmp_mv->as_mv, &ref_mv.as_mv,
                              x->nmvjointcost, x->mvcost, MV_COST_WEIGHT);
   if (cpi->sf.adaptive_motion_search && cpi->common.show_frame)
     x->pred_mv[ref].as_int = tmp_mv->as_int;
   if (scaled_ref_frame) {
     int i;
     for (i = 0; i < MAX_MB_PLANE; i++)
       xd->plane[i].pre[0] = backup_yv12[i];
   }
 }
 static void joint_motion_search(VP9_COMP *cpi, MACROBLOCK *x,
                                 BLOCK_SIZE bsize,
                                 int_mv *frame_mv,
                                 int mi_row, int mi_col,
                                 int_mv single_newmv[MAX_REF_FRAMES],
                                 int *rate_mv) {
   int pw = 4 << b_width_log2(bsize), ph = 4 << b_height_log2(bsize);
   MACROBLOCKD *xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   const int refs[2] = { mbmi->ref_frame[0],
                         mbmi->ref_frame[1] < 0 ? 0 : mbmi->ref_frame[1] };
   int_mv ref_mv[2];
   const BLOCK_SIZE block_size = get_plane_block_size(bsize, &xd->plane[0]);
   int ite, ref;
   // Prediction buffer from second frame.
   uint8_t *second_pred = vpx_memalign(16, pw * ph * sizeof(uint8_t));
   // Do joint motion search in compound mode to get more accurate mv.
   struct buf_2d backup_yv12[2][MAX_MB_PLANE];
   struct buf_2d scaled_first_yv12 = xd->plane[0].pre[0];
   int last_besterr[2] = {INT_MAX, INT_MAX};
   YV12_BUFFER_CONFIG *const scaled_ref_frame[2] = {
     get_scaled_ref_frame(cpi, mbmi->ref_frame[0]),
     get_scaled_ref_frame(cpi, mbmi->ref_frame[1])
   };
   for (ref = 0; ref < 2; ++ref) {
     ref_mv[ref] = mbmi->ref_mvs[refs[ref]][0];
     if (scaled_ref_frame[ref]) {
       int i;
       // Swap out the reference frame for a version that's been scaled to
       // match the resolution of the current frame, allowing the existing
       // motion search code to be used without additional modifications.
       for (i = 0; i < MAX_MB_PLANE; i++)
         backup_yv12[ref][i] = xd->plane[i].pre[ref];
       setup_pre_planes(xd, ref, scaled_ref_frame[ref], mi_row, mi_col, NULL);
     }
     xd->scale_factor[ref].sfc->set_scaled_offsets(&xd->scale_factor[ref],
                                                   mi_row, mi_col);
     frame_mv[refs[ref]].as_int = single_newmv[refs[ref]].as_int;
   }
   // Allow joint search multiple times iteratively for each ref frame
   // and break out the search loop if it couldn't find better mv.
   for (ite = 0; ite < 4; ite++) {
     struct buf_2d ref_yv12[2];
     int bestsme = INT_MAX;
     int sadpb = x->sadperbit16;
     int_mv tmp_mv;
     int search_range = 3;
     int tmp_col_min = x->mv_col_min;
     int tmp_col_max = x->mv_col_max;
     int tmp_row_min = x->mv_row_min;
     int tmp_row_max = x->mv_row_max;
     int id = ite % 2;
     // Initialized here because of compiler problem in Visual Studio.
     ref_yv12[0] = xd->plane[0].pre[0];
     ref_yv12[1] = xd->plane[0].pre[1];
     // Get pred block from second frame.
     vp9_build_inter_predictor(ref_yv12[!id].buf,
                               ref_yv12[!id].stride,
                               second_pred, pw,
                               &frame_mv[refs[!id]].as_mv,
                               &xd->scale_factor[!id],
                               pw, ph, 0,
                               &xd->subpix, MV_PRECISION_Q3);
     // Compound motion search on first ref frame.
     if (id)
       xd->plane[0].pre[0] = ref_yv12[id];
     vp9_clamp_mv_min_max(x, &ref_mv[id].as_mv);
     // Use mv result from single mode as mvp.
     tmp_mv.as_int = frame_mv[refs[id]].as_int;
     tmp_mv.as_mv.col >>= 3;
     tmp_mv.as_mv.row >>= 3;
     // Small-range full-pixel motion search
     bestsme = vp9_refining_search_8p_c(x, &tmp_mv, sadpb,
                                        search_range,
                                        &cpi->fn_ptr[block_size],
                                        x->nmvjointcost, x->mvcost,
                                        &ref_mv[id], second_pred,
                                        pw, ph);
     x->mv_col_min = tmp_col_min;
     x->mv_col_max = tmp_col_max;
     x->mv_row_min = tmp_row_min;
     x->mv_row_max = tmp_row_max;
     if (bestsme < INT_MAX) {
       int dis; /* TODO: use dis in distortion calculation later. */
       unsigned int sse;
       bestsme = cpi->find_fractional_mv_step_comp(
           x, &tmp_mv.as_mv,
           &ref_mv[id].as_mv,
           cpi->common.allow_high_precision_mv,
           x->errorperbit,
           &cpi->fn_ptr[block_size],
 , cpi->sf.subpel_iters_per_step,
           x->nmvjointcost, x->mvcost,
           &dis, &sse, second_pred,
           pw, ph);
     }
     if (id)
       xd->plane[0].pre[0] = scaled_first_yv12;
     if (bestsme < last_besterr[id]) {
       frame_mv[refs[id]].as_int = tmp_mv.as_int;
       last_besterr[id] = bestsme;
     } else {
       break;
     }
   }
   *rate_mv = 0;
   for (ref = 0; ref < 2; ++ref) {
     if (scaled_ref_frame[ref]) {
       // restore the predictor
       int i;
       for (i = 0; i < MAX_MB_PLANE; i++)
         xd->plane[i].pre[ref] = backup_yv12[ref][i];
     }
     *rate_mv += vp9_mv_bit_cost(&frame_mv[refs[ref]].as_mv,
                                 &mbmi->ref_mvs[refs[ref]][0].as_mv,
                                 x->nmvjointcost, x->mvcost, MV_COST_WEIGHT);
   }
   vpx_free(second_pred);
 }
 static int64_t handle_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
                                  const TileInfo *const tile,
                                  BLOCK_SIZE bsize,
                                  int64_t txfm_cache[],
                                  int *rate2, int64_t *distortion,
                                  int *skippable,
                                  int *rate_y, int64_t *distortion_y,
                                  int *rate_uv, int64_t *distortion_uv,
                                  int *mode_excluded, int *disable_skip,
                                  INTERPOLATION_TYPE *best_filter,
                                  int_mv (*mode_mv)[MAX_REF_FRAMES],
                                  int mi_row, int mi_col,
                                  int_mv single_newmv[MAX_REF_FRAMES],
                                  int64_t *psse,
                                  const int64_t ref_best_rd) {
   VP9_COMMON *cm = &cpi->common;
   MACROBLOCKD *xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   const int is_comp_pred = has_second_ref(mbmi);
   const int num_refs = is_comp_pred ? 2 : 1;
   const int this_mode = mbmi->mode;
   int_mv *frame_mv = mode_mv[this_mode];
   int i;
   int refs[2] = { mbmi->ref_frame[0],
     (mbmi->ref_frame[1] < 0 ? 0 : mbmi->ref_frame[1]) };
   int_mv cur_mv[2];
   int64_t this_rd = 0;
   DECLARE_ALIGNED_ARRAY(16, uint8_t, tmp_buf, MAX_MB_PLANE * 64 * 64);
   int pred_exists = 0;
   int intpel_mv;
   int64_t rd, best_rd = INT64_MAX;
   int best_needs_copy = 0;
   uint8_t *orig_dst[MAX_MB_PLANE];
   int orig_dst_stride[MAX_MB_PLANE];
   int rs = 0;
   if (is_comp_pred) {
     if (frame_mv[refs[0]].as_int == INVALID_MV ||
         frame_mv[refs[1]].as_int == INVALID_MV)
       return INT64_MAX;
   }
   if (this_mode == NEWMV) {
     int rate_mv;
     if (is_comp_pred) {
       // Initialize mv using single prediction mode result.
       frame_mv[refs[0]].as_int = single_newmv[refs[0]].as_int;
       frame_mv[refs[1]].as_int = single_newmv[refs[1]].as_int;
       if (cpi->sf.comp_inter_joint_search_thresh <= bsize) {
         joint_motion_search(cpi, x, bsize, frame_mv,
                             mi_row, mi_col, single_newmv, &rate_mv);
       } else {
         rate_mv  = vp9_mv_bit_cost(&frame_mv[refs[0]].as_mv,
                                    &mbmi->ref_mvs[refs[0]][0].as_mv,
                                    x->nmvjointcost, x->mvcost, MV_COST_WEIGHT);
         rate_mv += vp9_mv_bit_cost(&frame_mv[refs[1]].as_mv,
                                    &mbmi->ref_mvs[refs[1]][0].as_mv,
                                    x->nmvjointcost, x->mvcost, MV_COST_WEIGHT);
       }
       *rate2 += rate_mv;
     } else {
       int_mv tmp_mv;
       single_motion_search(cpi, x, tile, bsize, mi_row, mi_col,
                            &tmp_mv, &rate_mv);
       *rate2 += rate_mv;
       frame_mv[refs[0]].as_int =
           xd->mi_8x8[0]->bmi[0].as_mv[0].as_int = tmp_mv.as_int;
       single_newmv[refs[0]].as_int = tmp_mv.as_int;
     }
   }
   // if we're near/nearest and mv == 0,0, compare to zeromv
   if ((this_mode == NEARMV || this_mode == NEARESTMV || this_mode == ZEROMV) &&
       frame_mv[refs[0]].as_int == 0 &&
       !vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP) &&
       (num_refs == 1 || frame_mv[refs[1]].as_int == 0)) {
     int rfc = mbmi->mode_context[mbmi->ref_frame[0]];
     int c1 = cost_mv_ref(cpi, NEARMV, rfc);
     int c2 = cost_mv_ref(cpi, NEARESTMV, rfc);
     int c3 = cost_mv_ref(cpi, ZEROMV, rfc);
     if (this_mode == NEARMV) {
       if (c1 > c3)
         return INT64_MAX;
     } else if (this_mode == NEARESTMV) {
       if (c2 > c3)
         return INT64_MAX;
     } else {
       assert(this_mode == ZEROMV);
       if (num_refs == 1) {
         if ((c3 >= c2 &&
              mode_mv[NEARESTMV][mbmi->ref_frame[0]].as_int == 0) ||
             (c3 >= c1 &&
              mode_mv[NEARMV][mbmi->ref_frame[0]].as_int == 0))
           return INT64_MAX;
       } else {
         if ((c3 >= c2 &&
              mode_mv[NEARESTMV][mbmi->ref_frame[0]].as_int == 0 &&
              mode_mv[NEARESTMV][mbmi->ref_frame[1]].as_int == 0) ||
             (c3 >= c1 &&
              mode_mv[NEARMV][mbmi->ref_frame[0]].as_int == 0 &&
              mode_mv[NEARMV][mbmi->ref_frame[1]].as_int == 0))
           return INT64_MAX;
       }
     }
   }
   for (i = 0; i < num_refs; ++i) {
     cur_mv[i] = frame_mv[refs[i]];
     // Clip "next_nearest" so that it does not extend to far out of image
     if (this_mode != NEWMV)
       clamp_mv2(&cur_mv[i].as_mv, xd);
     if (mv_check_bounds(x, &cur_mv[i]))
       return INT64_MAX;
     mbmi->mv[i].as_int = cur_mv[i].as_int;
   }
   // do first prediction into the destination buffer. Do the next
   // prediction into a temporary buffer. Then keep track of which one
   // of these currently holds the best predictor, and use the other
   // one for future predictions. In the end, copy from tmp_buf to
   // dst if necessary.
   for (i = 0; i < MAX_MB_PLANE; i++) {
     orig_dst[i] = xd->plane[i].dst.buf;
     orig_dst_stride[i] = xd->plane[i].dst.stride;
   }
   /* We don't include the cost of the second reference here, because there
    * are only three options: Last/Golden, ARF/Last or Golden/ARF, or in other
    * words if you present them in that order, the second one is always known
    * if the first is known */
   *rate2 += cost_mv_ref(cpi, this_mode,
                         mbmi->mode_context[mbmi->ref_frame[0]]);
   if (!(*mode_excluded)) {
     if (is_comp_pred) {
       *mode_excluded = (cpi->common.comp_pred_mode == SINGLE_PREDICTION_ONLY);
     } else {
       *mode_excluded = (cpi->common.comp_pred_mode == COMP_PREDICTION_ONLY);
     }
   }
   pred_exists = 0;
   // Are all MVs integer pel for Y and UV
   intpel_mv = (mbmi->mv[0].as_mv.row & 15) == 0 &&
       (mbmi->mv[0].as_mv.col & 15) == 0;
   if (is_comp_pred)
     intpel_mv &= (mbmi->mv[1].as_mv.row & 15) == 0 &&
         (mbmi->mv[1].as_mv.col & 15) == 0;
   // Search for best switchable filter by checking the variance of
   // pred error irrespective of whether the filter will be used
   if (cm->mcomp_filter_type != BILINEAR) {
     *best_filter = EIGHTTAP;
     if (x->source_variance <
         cpi->sf.disable_filter_search_var_thresh) {
       *best_filter = EIGHTTAP;
       vp9_zero(cpi->rd_filter_cache);
     } else {
       int i, newbest;
       int tmp_rate_sum = 0;
       int64_t tmp_dist_sum = 0;
       cpi->rd_filter_cache[SWITCHABLE_FILTERS] = INT64_MAX;
       for (i = 0; i < SWITCHABLE_FILTERS; ++i) {
         int j;
         int64_t rs_rd;
         mbmi->interp_filter = i;
         vp9_setup_interp_filters(xd, mbmi->interp_filter, cm);
         rs = get_switchable_rate(x);
         rs_rd = RDCOST(x->rdmult, x->rddiv, rs, 0);
         if (i > 0 && intpel_mv) {
           cpi->rd_filter_cache[i] = RDCOST(x->rdmult, x->rddiv,
                                            tmp_rate_sum, tmp_dist_sum);
           cpi->rd_filter_cache[SWITCHABLE_FILTERS] =
               MIN(cpi->rd_filter_cache[SWITCHABLE_FILTERS],
                   cpi->rd_filter_cache[i] + rs_rd);
           rd = cpi->rd_filter_cache[i];
           if (cm->mcomp_filter_type == SWITCHABLE)
             rd += rs_rd;
         } else {
           int rate_sum = 0;
           int64_t dist_sum = 0;
           if ((cm->mcomp_filter_type == SWITCHABLE &&
                (!i || best_needs_copy)) ||
               (cm->mcomp_filter_type != SWITCHABLE &&
                (cm->mcomp_filter_type == mbmi->interp_filter ||
                 (i == 0 && intpel_mv)))) {
             for (j = 0; j < MAX_MB_PLANE; j++) {
               xd->plane[j].dst.buf = orig_dst[j];
               xd->plane[j].dst.stride = orig_dst_stride[j];
             }
           } else {
             for (j = 0; j < MAX_MB_PLANE; j++) {
               xd->plane[j].dst.buf = tmp_buf + j * 64 * 64;
               xd->plane[j].dst.stride = 64;
             }
           }
           vp9_build_inter_predictors_sb(xd, mi_row, mi_col, bsize);
           model_rd_for_sb(cpi, bsize, x, xd, &rate_sum, &dist_sum);
           cpi->rd_filter_cache[i] = RDCOST(x->rdmult, x->rddiv,
                                            rate_sum, dist_sum);
           cpi->rd_filter_cache[SWITCHABLE_FILTERS] =
               MIN(cpi->rd_filter_cache[SWITCHABLE_FILTERS],
                   cpi->rd_filter_cache[i] + rs_rd);
           rd = cpi->rd_filter_cache[i];
           if (cm->mcomp_filter_type == SWITCHABLE)
             rd += rs_rd;
           if (i == 0 && intpel_mv) {
             tmp_rate_sum = rate_sum;
             tmp_dist_sum = dist_sum;
           }
         }
         if (i == 0 && cpi->sf.use_rd_breakout && ref_best_rd < INT64_MAX) {
           if (rd / 2 > ref_best_rd) {
             for (i = 0; i < MAX_MB_PLANE; i++) {
               xd->plane[i].dst.buf = orig_dst[i];
               xd->plane[i].dst.stride = orig_dst_stride[i];
             }
             return INT64_MAX;
           }
         }
         newbest = i == 0 || rd < best_rd;
         if (newbest) {
           best_rd = rd;
           *best_filter = mbmi->interp_filter;
           if (cm->mcomp_filter_type == SWITCHABLE && i && !intpel_mv)
             best_needs_copy = !best_needs_copy;
         }
         if ((cm->mcomp_filter_type == SWITCHABLE && newbest) ||
             (cm->mcomp_filter_type != SWITCHABLE &&
              cm->mcomp_filter_type == mbmi->interp_filter)) {
           pred_exists = 1;
         }
       }
       for (i = 0; i < MAX_MB_PLANE; i++) {
         xd->plane[i].dst.buf = orig_dst[i];
         xd->plane[i].dst.stride = orig_dst_stride[i];
       }
     }
   }
   // Set the appropriate filter
   mbmi->interp_filter = cm->mcomp_filter_type != SWITCHABLE ?
       cm->mcomp_filter_type : *best_filter;
   vp9_setup_interp_filters(xd, mbmi->interp_filter, cm);
   rs = cm->mcomp_filter_type == SWITCHABLE ? get_switchable_rate(x) : 0;
   if (pred_exists) {
     if (best_needs_copy) {
       // again temporarily set the buffers to local memory to prevent a memcpy
       for (i = 0; i < MAX_MB_PLANE; i++) {
         xd->plane[i].dst.buf = tmp_buf + i * 64 * 64;
         xd->plane[i].dst.stride = 64;
       }
     }
   } else {
     // Handles the special case when a filter that is not in the
     // switchable list (ex. bilinear, 6-tap) is indicated at the frame level
     vp9_build_inter_predictors_sb(xd, mi_row, mi_col, bsize);
   }
   if (cpi->sf.use_rd_breakout && ref_best_rd < INT64_MAX) {
     int tmp_rate;
     int64_t tmp_dist;
     model_rd_for_sb(cpi, bsize, x, xd, &tmp_rate, &tmp_dist);
     rd = RDCOST(x->rdmult, x->rddiv, rs + tmp_rate, tmp_dist);
     // if current pred_error modeled rd is substantially more than the best
     // so far, do not bother doing full rd
     if (rd / 2 > ref_best_rd) {
       for (i = 0; i < MAX_MB_PLANE; i++) {
         xd->plane[i].dst.buf = orig_dst[i];
         xd->plane[i].dst.stride = orig_dst_stride[i];
       }
       return INT64_MAX;
     }
   }
   if (cpi->common.mcomp_filter_type == SWITCHABLE)
     *rate2 += get_switchable_rate(x);
   if (!is_comp_pred && cpi->enable_encode_breakout) {
     if (cpi->active_map_enabled && x->active_ptr[0] == 0)
       x->skip = 1;
     else if (x->encode_breakout) {
       const BLOCK_SIZE y_size = get_plane_block_size(bsize, &xd->plane[0]);
       const BLOCK_SIZE uv_size = get_plane_block_size(bsize, &xd->plane[1]);
       unsigned int var, sse;
       // Skipping threshold for ac.
       unsigned int thresh_ac;
       // The encode_breakout input
       unsigned int encode_breakout = x->encode_breakout << 4;
       unsigned int max_thresh = 36000;
       // Use extreme low threshold for static frames to limit skipping.
       if (cpi->enable_encode_breakout == 2)
         max_thresh = 128;
       // Calculate threshold according to dequant value.
       thresh_ac = (xd->plane[0].dequant[1] * xd->plane[0].dequant[1]) / 9;
       // Use encode_breakout input if it is bigger than internal threshold.
       if (thresh_ac < encode_breakout)
         thresh_ac = encode_breakout;
       // Set a maximum for threshold to avoid big PSNR loss in low bitrate case.
       if (thresh_ac > max_thresh)
         thresh_ac = max_thresh;
       var = cpi->fn_ptr[y_size].vf(x->plane[0].src.buf, x->plane[0].src.stride,
                                    xd->plane[0].dst.buf,
                                    xd->plane[0].dst.stride, &sse);
       // Adjust threshold according to partition size.
       thresh_ac >>= 8 - (b_width_log2_lookup[bsize] +
           b_height_log2_lookup[bsize]);
       // Y skipping condition checking
       if (sse < thresh_ac || sse == 0) {
         // Skipping threshold for dc
         unsigned int thresh_dc;
         thresh_dc = (xd->plane[0].dequant[0] * xd->plane[0].dequant[0] >> 6);
         // dc skipping checking
         if ((sse - var) < thresh_dc || sse == var) {
           unsigned int sse_u, sse_v;
           unsigned int var_u, var_v;
           var_u = cpi->fn_ptr[uv_size].vf(x->plane[1].src.buf,
                                           x->plane[1].src.stride,
                                           xd->plane[1].dst.buf,
                                           xd->plane[1].dst.stride, &sse_u);
           // U skipping condition checking
           if ((sse_u * 4 < thresh_ac || sse_u == 0) &&
               (sse_u - var_u < thresh_dc || sse_u == var_u)) {
             var_v = cpi->fn_ptr[uv_size].vf(x->plane[2].src.buf,
                                             x->plane[2].src.stride,
                                             xd->plane[2].dst.buf,
                                             xd->plane[2].dst.stride, &sse_v);
             // V skipping condition checking
             if ((sse_v * 4 < thresh_ac || sse_v == 0) &&
                 (sse_v - var_v < thresh_dc || sse_v == var_v)) {
               x->skip = 1;
               // The cost of skip bit needs to be added.
               *rate2 += vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd), 1);
               // Scaling factor for SSE from spatial domain to frequency domain
               // is 16. Adjust distortion accordingly.
               *distortion_uv = (sse_u + sse_v) << 4;
               *distortion = (sse << 4) + *distortion_uv;
               *disable_skip = 1;
               this_rd = RDCOST(x->rdmult, x->rddiv, *rate2, *distortion);
             }
           }
         }
       }
     }
   }
   if (!x->skip) {
     int skippable_y, skippable_uv;
     int64_t sseuv = INT64_MAX;
     int64_t rdcosty = INT64_MAX;
     // Y cost and distortion
     super_block_yrd(cpi, x, rate_y, distortion_y, &skippable_y, psse,
                     bsize, txfm_cache, ref_best_rd);
     if (*rate_y == INT_MAX) {
       *rate2 = INT_MAX;
       *distortion = INT64_MAX;
       for (i = 0; i < MAX_MB_PLANE; i++) {
         xd->plane[i].dst.buf = orig_dst[i];
         xd->plane[i].dst.stride = orig_dst_stride[i];
       }
       return INT64_MAX;
     }
     *rate2 += *rate_y;
     *distortion += *distortion_y;
     rdcosty = RDCOST(x->rdmult, x->rddiv, *rate2, *distortion);
     rdcosty = MIN(rdcosty, RDCOST(x->rdmult, x->rddiv, 0, *psse));
     super_block_uvrd(cpi, x, rate_uv, distortion_uv, &skippable_uv, &sseuv,
                      bsize, ref_best_rd - rdcosty);
     if (*rate_uv == INT_MAX) {
       *rate2 = INT_MAX;
       *distortion = INT64_MAX;
       for (i = 0; i < MAX_MB_PLANE; i++) {
         xd->plane[i].dst.buf = orig_dst[i];
         xd->plane[i].dst.stride = orig_dst_stride[i];
       }
       return INT64_MAX;
     }
     *psse += sseuv;
     *rate2 += *rate_uv;
     *distortion += *distortion_uv;
     *skippable = skippable_y && skippable_uv;
   }
   for (i = 0; i < MAX_MB_PLANE; i++) {
     xd->plane[i].dst.buf = orig_dst[i];
     xd->plane[i].dst.stride = orig_dst_stride[i];
   }
   return this_rd;  // if 0, this will be re-calculated by caller
 }
 static void swap_block_ptr(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx,
                            int max_plane) {
   struct macroblock_plane *const p = x->plane;
   struct macroblockd_plane *const pd = x->e_mbd.plane;
   int i;
   for (i = 0; i < max_plane; ++i) {
     p[i].coeff    = ctx->coeff_pbuf[i][1];
     pd[i].qcoeff  = ctx->qcoeff_pbuf[i][1];
     pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][1];
     pd[i].eobs    = ctx->eobs_pbuf[i][1];
     ctx->coeff_pbuf[i][1]   = ctx->coeff_pbuf[i][0];
     ctx->qcoeff_pbuf[i][1]  = ctx->qcoeff_pbuf[i][0];
     ctx->dqcoeff_pbuf[i][1] = ctx->dqcoeff_pbuf[i][0];
     ctx->eobs_pbuf[i][1]    = ctx->eobs_pbuf[i][0];
     ctx->coeff_pbuf[i][0]   = p[i].coeff;
     ctx->qcoeff_pbuf[i][0]  = pd[i].qcoeff;
     ctx->dqcoeff_pbuf[i][0] = pd[i].dqcoeff;
     ctx->eobs_pbuf[i][0]    = pd[i].eobs;
   }
 }
 void vp9_rd_pick_intra_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,
                                int *returnrate, int64_t *returndist,
                                BLOCK_SIZE bsize,
                                PICK_MODE_CONTEXT *ctx, int64_t best_rd) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCKD *const xd = &x->e_mbd;
   int rate_y = 0, rate_uv = 0, rate_y_tokenonly = 0, rate_uv_tokenonly = 0;
   int y_skip = 0, uv_skip = 0;
   int64_t dist_y = 0, dist_uv = 0, tx_cache[TX_MODES] = { 0 };
   x->skip_encode = 0;
   ctx->skip = 0;
   xd->mi_8x8[0]->mbmi.ref_frame[0] = INTRA_FRAME;
   if (bsize >= BLOCK_8X8) {
     if (rd_pick_intra_sby_mode(cpi, x, &rate_y, &rate_y_tokenonly,
                                &dist_y, &y_skip, bsize, tx_cache,
                                best_rd) >= best_rd) {
       *returnrate = INT_MAX;
       return;
     }
     rd_pick_intra_sbuv_mode(cpi, x, ctx, &rate_uv, &rate_uv_tokenonly,
                             &dist_uv, &uv_skip, bsize);
   } else {
     y_skip = 0;
     if (rd_pick_intra_sub_8x8_y_mode(cpi, x, &rate_y, &rate_y_tokenonly,
                                      &dist_y, best_rd) >= best_rd) {
       *returnrate = INT_MAX;
       return;
     }
     rd_pick_intra_sbuv_mode(cpi, x, ctx, &rate_uv, &rate_uv_tokenonly,
                             &dist_uv, &uv_skip, BLOCK_8X8);
   }
   if (y_skip && uv_skip) {
     *returnrate = rate_y + rate_uv - rate_y_tokenonly - rate_uv_tokenonly +
                   vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd), 1);
     *returndist = dist_y + dist_uv;
     vp9_zero(ctx->tx_rd_diff);
   } else {
     int i;
     *returnrate = rate_y + rate_uv +
         vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd), 0);
     *returndist = dist_y + dist_uv;
     if (cpi->sf.tx_size_search_method == USE_FULL_RD)
       for (i = 0; i < TX_MODES; i++) {
         if (tx_cache[i] < INT64_MAX && tx_cache[cm->tx_mode] < INT64_MAX)
           ctx->tx_rd_diff[i] = tx_cache[i] - tx_cache[cm->tx_mode];
         else
           ctx->tx_rd_diff[i] = 0;
       }
   }
   ctx->mic = *xd->mi_8x8[0];
 }
 int64_t vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,
                                   const TileInfo *const tile,
                                   int mi_row, int mi_col,
                                   int *returnrate,
                                   int64_t *returndistortion,
                                   BLOCK_SIZE bsize,
                                   PICK_MODE_CONTEXT *ctx,
                                   int64_t best_rd_so_far) {
   VP9_COMMON *cm = &cpi->common;
   MACROBLOCKD *xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   const struct segmentation *seg = &cm->seg;
   const BLOCK_SIZE block_size = get_plane_block_size(bsize, &xd->plane[0]);
   MB_PREDICTION_MODE this_mode;
   MV_REFERENCE_FRAME ref_frame, second_ref_frame;
   unsigned char segment_id = mbmi->segment_id;
   int comp_pred, i;
   int_mv frame_mv[MB_MODE_COUNT][MAX_REF_FRAMES];
   struct buf_2d yv12_mb[4][MAX_MB_PLANE];
   int_mv single_newmv[MAX_REF_FRAMES] = { { 0 } };
   static const int flag_list[4] = { 0, VP9_LAST_FLAG, VP9_GOLD_FLAG,
                                     VP9_ALT_FLAG };
   int idx_list[4] = {0,
                      cpi->lst_fb_idx,
                      cpi->gld_fb_idx,
                      cpi->alt_fb_idx};
   int64_t best_rd = best_rd_so_far;
   int64_t best_tx_rd[TX_MODES];
   int64_t best_tx_diff[TX_MODES];
   int64_t best_pred_diff[NB_PREDICTION_TYPES];
   int64_t best_pred_rd[NB_PREDICTION_TYPES];
   int64_t best_filter_rd[SWITCHABLE_FILTER_CONTEXTS];
   int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS];
   MB_MODE_INFO best_mbmode = { 0 };
   int j;
   int mode_index, best_mode_index = 0;
   unsigned int ref_costs_single[MAX_REF_FRAMES], ref_costs_comp[MAX_REF_FRAMES];
   vp9_prob comp_mode_p;
   int64_t best_intra_rd = INT64_MAX;
   int64_t best_inter_rd = INT64_MAX;
   MB_PREDICTION_MODE best_intra_mode = DC_PRED;
   MV_REFERENCE_FRAME best_inter_ref_frame = LAST_FRAME;
   INTERPOLATION_TYPE tmp_best_filter = SWITCHABLE;
   int rate_uv_intra[TX_SIZES], rate_uv_tokenonly[TX_SIZES];
   int64_t dist_uv[TX_SIZES];
   int skip_uv[TX_SIZES];
   MB_PREDICTION_MODE mode_uv[TX_SIZES];
   struct scale_factors scale_factor[4];
   unsigned int ref_frame_mask = 0;
   unsigned int mode_mask = 0;
   int64_t mode_distortions[MB_MODE_COUNT] = {-1};
   int64_t frame_distortions[MAX_REF_FRAMES] = {-1};
   int intra_cost_penalty = 20 * vp9_dc_quant(cm->base_qindex, cm->y_dc_delta_q);
   const int bws = num_8x8_blocks_wide_lookup[bsize] / 2;
   const int bhs = num_8x8_blocks_high_lookup[bsize] / 2;
   int best_skip2 = 0;
   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;
   // Everywhere the flag is set the error is much higher than its neighbors.
   ctx->frames_with_high_error = 0;
   ctx->modes_with_high_error = 0;
   estimate_ref_frame_costs(cpi, segment_id, ref_costs_single, ref_costs_comp,
                            &comp_mode_p);
   for (i = 0; i < NB_PREDICTION_TYPES; ++i)
     best_pred_rd[i] = INT64_MAX;
   for (i = 0; i < TX_MODES; i++)
     best_tx_rd[i] = INT64_MAX;
   for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
     best_filter_rd[i] = INT64_MAX;
   for (i = 0; i < TX_SIZES; i++)
     rate_uv_intra[i] = INT_MAX;
   *returnrate = INT_MAX;
   // Create a mask set to 1 for each reference frame used by a smaller
   // resolution.
   if (cpi->sf.use_avoid_tested_higherror) {
     switch (block_size) {
       case BLOCK_64X64:
         for (i = 0; i < 4; i++) {
           for (j = 0; j < 4; j++) {
             ref_frame_mask |= x->mb_context[i][j].frames_with_high_error;
             mode_mask |= x->mb_context[i][j].modes_with_high_error;
           }
         }
         for (i = 0; i < 4; i++) {
           ref_frame_mask |= x->sb32_context[i].frames_with_high_error;
           mode_mask |= x->sb32_context[i].modes_with_high_error;
         }
         break;
       case BLOCK_32X32:
         for (i = 0; i < 4; i++) {
           ref_frame_mask |=
               x->mb_context[x->sb_index][i].frames_with_high_error;
           mode_mask |= x->mb_context[x->sb_index][i].modes_with_high_error;
         }
         break;
       default:
         // Until we handle all block sizes set it to present;
         ref_frame_mask = 0;
         mode_mask = 0;
         break;
     }
     ref_frame_mask = ~ref_frame_mask;
     mode_mask = ~mode_mask;
   }
   for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
     if (cpi->ref_frame_flags & flag_list[ref_frame]) {
       setup_buffer_inter(cpi, x, tile, idx_list[ref_frame], ref_frame,
                          block_size, mi_row, mi_col,
                          frame_mv[NEARESTMV], frame_mv[NEARMV],
                          yv12_mb, scale_factor);
     }
     frame_mv[NEWMV][ref_frame].as_int = INVALID_MV;
     frame_mv[ZEROMV][ref_frame].as_int = 0;
   }
   for (mode_index = 0; mode_index < MAX_MODES; ++mode_index) {
     int mode_excluded = 0;
     int64_t this_rd = INT64_MAX;
     int disable_skip = 0;
     int compmode_cost = 0;
     int rate2 = 0, rate_y = 0, rate_uv = 0;
     int64_t distortion2 = 0, distortion_y = 0, distortion_uv = 0;
     int skippable = 0;
     int64_t tx_cache[TX_MODES];
     int i;
     int this_skip2 = 0;
     int64_t total_sse = INT_MAX;
     int early_term = 0;
     for (i = 0; i < TX_MODES; ++i)
       tx_cache[i] = INT64_MAX;
     x->skip = 0;
     this_mode = vp9_mode_order[mode_index].mode;
     ref_frame = vp9_mode_order[mode_index].ref_frame;
     second_ref_frame = vp9_mode_order[mode_index].second_ref_frame;
     // Look at the reference frame of the best mode so far and set the
     // skip mask to look at a subset of the remaining modes.
     if (mode_index > cpi->sf.mode_skip_start) {
       if (mode_index == (cpi->sf.mode_skip_start + 1)) {
         switch (vp9_mode_order[best_mode_index].ref_frame) {
           case INTRA_FRAME:
             cpi->mode_skip_mask = 0;
             break;
           case LAST_FRAME:
             cpi->mode_skip_mask = LAST_FRAME_MODE_MASK;
             break;
           case GOLDEN_FRAME:
             cpi->mode_skip_mask = GOLDEN_FRAME_MODE_MASK;
             break;
           case ALTREF_FRAME:
             cpi->mode_skip_mask = ALT_REF_MODE_MASK;
             break;
           case NONE:
           case MAX_REF_FRAMES:
             assert(!"Invalid Reference frame");
         }
       }
       if (cpi->mode_skip_mask & ((int64_t)1 << mode_index))
         continue;
     }
     // Skip if the current reference frame has been masked off
     if (cpi->sf.reference_masking && !cpi->set_ref_frame_mask &&
         (cpi->ref_frame_mask & (1 << ref_frame)))
       continue;
     // Test best rd so far against threshold for trying this mode.
     if ((best_rd < ((int64_t)cpi->rd_threshes[segment_id][bsize][mode_index] *
                      cpi->rd_thresh_freq_fact[bsize][mode_index] >> 5)) ||
         cpi->rd_threshes[segment_id][bsize][mode_index] == INT_MAX)
       continue;
     // Do not allow compound prediction if the segment level reference
     // frame feature is in use as in this case there can only be one reference.
     if ((second_ref_frame > INTRA_FRAME) &&
          vp9_segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME))
       continue;
     // Skip some checking based on small partitions' result.
     if (x->fast_ms > 1 && !ref_frame)
       continue;
     if (x->fast_ms > 2 && ref_frame != x->subblock_ref)
       continue;
     if (cpi->sf.use_avoid_tested_higherror && bsize >= BLOCK_8X8) {
       if (!(ref_frame_mask & (1 << ref_frame))) {
         continue;
       }
       if (!(mode_mask & (1 << this_mode))) {
         continue;
       }
       if (second_ref_frame != NONE
           && !(ref_frame_mask & (1 << second_ref_frame))) {
         continue;
       }
     }
     mbmi->ref_frame[0] = ref_frame;
     mbmi->ref_frame[1] = second_ref_frame;
     if (!(ref_frame == INTRA_FRAME
         || (cpi->ref_frame_flags & flag_list[ref_frame]))) {
       continue;
     }
     if (!(second_ref_frame == NONE
         || (cpi->ref_frame_flags & flag_list[second_ref_frame]))) {
       continue;
     }
     comp_pred = second_ref_frame > INTRA_FRAME;
     if (comp_pred) {
       if (cpi->sf.mode_search_skip_flags & FLAG_SKIP_COMP_BESTINTRA)
         if (vp9_mode_order[best_mode_index].ref_frame == INTRA_FRAME)
           continue;
       if (cpi->sf.mode_search_skip_flags & FLAG_SKIP_COMP_REFMISMATCH)
         if (ref_frame != best_inter_ref_frame &&
             second_ref_frame != best_inter_ref_frame)
           continue;
     }
     set_scale_factors(xd, ref_frame, second_ref_frame, scale_factor);
     mbmi->uv_mode = DC_PRED;
     // Evaluate all sub-pel filters irrespective of whether we can use
     // them for this frame.
     mbmi->interp_filter = cm->mcomp_filter_type;
     vp9_setup_interp_filters(xd, mbmi->interp_filter, cm);
     if (comp_pred) {
       if (!(cpi->ref_frame_flags & flag_list[second_ref_frame]))
         continue;
       set_scale_factors(xd, ref_frame, second_ref_frame, scale_factor);
       mode_excluded = mode_excluded
                          ? mode_excluded
                          : cm->comp_pred_mode == SINGLE_PREDICTION_ONLY;
     } else {
       if (ref_frame != INTRA_FRAME && second_ref_frame != INTRA_FRAME) {
         mode_excluded =
             mode_excluded ?
                 mode_excluded : cm->comp_pred_mode == COMP_PREDICTION_ONLY;
       }
     }
     // Select prediction reference frames.
     for (i = 0; i < MAX_MB_PLANE; i++) {
       xd->plane[i].pre[0] = yv12_mb[ref_frame][i];
       if (comp_pred)
         xd->plane[i].pre[1] = yv12_mb[second_ref_frame][i];
     }
     // If the segment reference frame feature is enabled....
     // then do nothing if the current ref frame is not allowed..
     if (vp9_segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME) &&
         vp9_get_segdata(seg, segment_id, SEG_LVL_REF_FRAME) !=
             (int)ref_frame) {
       continue;
     // If the segment skip feature is enabled....
     // then do nothing if the current mode is not allowed..
     } else if (vp9_segfeature_active(seg, segment_id, SEG_LVL_SKIP) &&
                (this_mode != ZEROMV && ref_frame != INTRA_FRAME)) {
       continue;
     // Disable this drop out case if the ref frame
     // segment level feature is enabled for this segment. This is to
     // prevent the possibility that we end up unable to pick any mode.
     } else if (!vp9_segfeature_active(seg, segment_id,
                                       SEG_LVL_REF_FRAME)) {
       // Only consider ZEROMV/ALTREF_FRAME for alt ref frame,
       // unless ARNR filtering is enabled in which case we want
       // an unfiltered alternative. We allow near/nearest as well
       // because they may result in zero-zero MVs but be cheaper.
       if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames == 0)) {
         if ((this_mode != ZEROMV &&
              !(this_mode == NEARMV &&
                frame_mv[NEARMV][ALTREF_FRAME].as_int == 0) &&
              !(this_mode == NEARESTMV &&
                frame_mv[NEARESTMV][ALTREF_FRAME].as_int == 0)) ||
             ref_frame != ALTREF_FRAME) {
           continue;
         }
       }
     }
     // TODO(JBB): This is to make up for the fact that we don't have sad
     // functions that work when the block size reads outside the umv.  We
     // should fix this either by making the motion search just work on
     // a representative block in the boundary ( first ) and then implement a
     // function that does sads when inside the border..
     if (((mi_row + bhs) > cm->mi_rows || (mi_col + bws) > cm->mi_cols) &&
         this_mode == NEWMV) {
       continue;
     }
 #ifdef MODE_TEST_HIT_STATS
     // TEST/DEBUG CODE
     // Keep a rcord of the number of test hits at each size
     cpi->mode_test_hits[bsize]++;
 #endif
     if (ref_frame == INTRA_FRAME) {
       TX_SIZE uv_tx;
       // Disable intra modes other than DC_PRED for blocks with low variance
       // Threshold for intra skipping based on source variance
       // TODO(debargha): Specialize the threshold for super block sizes
       static const unsigned int skip_intra_var_thresh[BLOCK_SIZES] = {
 , 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
       };
       if ((cpi->sf.mode_search_skip_flags & FLAG_SKIP_INTRA_LOWVAR) &&
           this_mode != DC_PRED &&
           x->source_variance < skip_intra_var_thresh[mbmi->sb_type])
         continue;
       // Only search the oblique modes if the best so far is
       // one of the neighboring directional modes
       if ((cpi->sf.mode_search_skip_flags & FLAG_SKIP_INTRA_BESTINTER) &&
           (this_mode >= D45_PRED && this_mode <= TM_PRED)) {
         if (vp9_mode_order[best_mode_index].ref_frame > INTRA_FRAME)
           continue;
       }
       mbmi->mode = this_mode;
       if (cpi->sf.mode_search_skip_flags & FLAG_SKIP_INTRA_DIRMISMATCH) {
         if (conditional_skipintra(mbmi->mode, best_intra_mode))
             continue;
       }
       super_block_yrd(cpi, x, &rate_y, &distortion_y, &skippable, NULL,
                       bsize, tx_cache, best_rd);
       if (rate_y == INT_MAX)
         continue;
       uv_tx = MIN(mbmi->tx_size, max_uv_txsize_lookup[bsize]);
       if (rate_uv_intra[uv_tx] == INT_MAX) {
         choose_intra_uv_mode(cpi, ctx, bsize, &rate_uv_intra[uv_tx],
                              &rate_uv_tokenonly[uv_tx],
                              &dist_uv[uv_tx], &skip_uv[uv_tx],
                              &mode_uv[uv_tx]);
       }
       rate_uv = rate_uv_tokenonly[uv_tx];
       distortion_uv = dist_uv[uv_tx];
       skippable = skippable && skip_uv[uv_tx];
       mbmi->uv_mode = mode_uv[uv_tx];
       rate2 = rate_y + x->mbmode_cost[mbmi->mode] + rate_uv_intra[uv_tx];
       if (this_mode != DC_PRED && this_mode != TM_PRED)
         rate2 += intra_cost_penalty;
       distortion2 = distortion_y + distortion_uv;
     } else {
       mbmi->mode = this_mode;
       compmode_cost = vp9_cost_bit(comp_mode_p, second_ref_frame > INTRA_FRAME);
       this_rd = handle_inter_mode(cpi, x, tile, bsize,
                                   tx_cache,
                                   &rate2, &distortion2, &skippable,
                                   &rate_y, &distortion_y,
                                   &rate_uv, &distortion_uv,
                                   &mode_excluded, &disable_skip,
                                   &tmp_best_filter, frame_mv,
                                   mi_row, mi_col,
                                   single_newmv, &total_sse, best_rd);
       if (this_rd == INT64_MAX)
         continue;
     }
     if (cm->comp_pred_mode == HYBRID_PREDICTION) {
       rate2 += compmode_cost;
     }
     // Estimate the reference frame signaling cost and add it
     // to the rolling cost variable.
     if (second_ref_frame > INTRA_FRAME) {
       rate2 += ref_costs_comp[ref_frame];
     } else {
       rate2 += ref_costs_single[ref_frame];
     }
     if (!disable_skip) {
       // Test for the condition where skip block will be activated
       // because there are no non zero coefficients and make any
       // necessary adjustment for rate. Ignore if skip is coded at
       // segment level as the cost wont have been added in.
       // Is Mb level skip allowed (i.e. not coded at segment level).
       const int mb_skip_allowed = !vp9_segfeature_active(seg, segment_id,
                                                          SEG_LVL_SKIP);
       if (skippable) {
         // Back out the coefficient coding costs
         rate2 -= (rate_y + rate_uv);
         // for best yrd calculation
         rate_uv = 0;
         if (mb_skip_allowed) {
           int prob_skip_cost;
           // Cost the skip mb case
           vp9_prob skip_prob =
             vp9_get_pred_prob_mbskip(cm, xd);
           if (skip_prob) {
             prob_skip_cost = vp9_cost_bit(skip_prob, 1);
             rate2 += prob_skip_cost;
           }
         }
       } else if (mb_skip_allowed && ref_frame != INTRA_FRAME && !xd->lossless) {
         if (RDCOST(x->rdmult, x->rddiv, rate_y + rate_uv, distortion2) <
             RDCOST(x->rdmult, x->rddiv, 0, total_sse)) {
           // Add in the cost of the no skip flag.
           int prob_skip_cost = vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd),
 );
           rate2 += prob_skip_cost;
         } else {
           // FIXME(rbultje) make this work for splitmv also
           int prob_skip_cost = vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd),
 );
           rate2 += prob_skip_cost;
           distortion2 = total_sse;
           assert(total_sse >= 0);
           rate2 -= (rate_y + rate_uv);
           rate_y = 0;
           rate_uv = 0;
           this_skip2 = 1;
         }
       } else if (mb_skip_allowed) {
         // Add in the cost of the no skip flag.
         int prob_skip_cost = vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd),
 );
         rate2 += prob_skip_cost;
       }
       // Calculate the final RD estimate for this mode.
       this_rd = RDCOST(x->rdmult, x->rddiv, rate2, distortion2);
     }
     // Keep record of best intra rd
     if (!is_inter_block(&xd->mi_8x8[0]->mbmi) &&
         this_rd < best_intra_rd) {
       best_intra_rd = this_rd;
       best_intra_mode = xd->mi_8x8[0]->mbmi.mode;
     }
     // Keep record of best inter rd with single reference
     if (is_inter_block(&xd->mi_8x8[0]->mbmi) &&
         !has_second_ref(&xd->mi_8x8[0]->mbmi) &&
         !mode_excluded && this_rd < best_inter_rd) {
       best_inter_rd = this_rd;
       best_inter_ref_frame = ref_frame;
     }
     if (!disable_skip && ref_frame == INTRA_FRAME) {
       for (i = 0; i < NB_PREDICTION_TYPES; ++i)
         best_pred_rd[i] = MIN(best_pred_rd[i], this_rd);
       for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
         best_filter_rd[i] = MIN(best_filter_rd[i], this_rd);
     }
     // Store the respective mode distortions for later use.
     if (mode_distortions[this_mode] == -1
         || distortion2 < mode_distortions[this_mode]) {
       mode_distortions[this_mode] = distortion2;
     }
     if (frame_distortions[ref_frame] == -1
         || distortion2 < frame_distortions[ref_frame]) {
       frame_distortions[ref_frame] = distortion2;
     }
     // Did this mode help.. i.e. is it the new best mode
     if (this_rd < best_rd || x->skip) {
       int max_plane = MAX_MB_PLANE;
       if (!mode_excluded) {
         // Note index of best mode so far
         best_mode_index = mode_index;
         if (ref_frame == INTRA_FRAME) {
           /* required for left and above block mv */
           mbmi->mv[0].as_int = 0;
           max_plane = 1;
         }
         *returnrate = rate2;
         *returndistortion = distortion2;
         best_rd = this_rd;
         best_mbmode = *mbmi;
         best_skip2 = this_skip2;
         if (!x->select_txfm_size)
           swap_block_ptr(x, ctx, max_plane);
         vpx_memcpy(ctx->zcoeff_blk, x->zcoeff_blk[mbmi->tx_size],
                    sizeof(uint8_t) * ctx->num_4x4_blk);
         // TODO(debargha): enhance this test with a better distortion prediction
         // based on qp, activity mask and history
         if ((cpi->sf.mode_search_skip_flags & FLAG_EARLY_TERMINATE) &&
             (mode_index > MIN_EARLY_TERM_INDEX)) {
           const int qstep = xd->plane[0].dequant[1];
           // TODO(debargha): Enhance this by specializing for each mode_index
           int scale = 4;
           if (x->source_variance < UINT_MAX) {
             const int var_adjust = (x->source_variance < 16);
             scale -= var_adjust;
           }
           if (ref_frame > INTRA_FRAME &&
               distortion2 * scale < qstep * qstep) {
             early_term = 1;
           }
         }
       }
     }
     /* keep record of best compound/single-only prediction */
     if (!disable_skip && ref_frame != INTRA_FRAME) {
       int single_rd, hybrid_rd, single_rate, hybrid_rate;
       if (cm->comp_pred_mode == HYBRID_PREDICTION) {
         single_rate = rate2 - compmode_cost;
         hybrid_rate = rate2;
       } else {
         single_rate = rate2;
         hybrid_rate = rate2 + compmode_cost;
       }
       single_rd = RDCOST(x->rdmult, x->rddiv, single_rate, distortion2);
       hybrid_rd = RDCOST(x->rdmult, x->rddiv, hybrid_rate, distortion2);
       if (second_ref_frame <= INTRA_FRAME &&
           single_rd < best_pred_rd[SINGLE_PREDICTION_ONLY]) {
         best_pred_rd[SINGLE_PREDICTION_ONLY] = single_rd;
       } else if (second_ref_frame > INTRA_FRAME &&
                  single_rd < best_pred_rd[COMP_PREDICTION_ONLY]) {
         best_pred_rd[COMP_PREDICTION_ONLY] = single_rd;
       }
       if (hybrid_rd < best_pred_rd[HYBRID_PREDICTION])
         best_pred_rd[HYBRID_PREDICTION] = hybrid_rd;
     }
     /* keep record of best filter type */
     if (!mode_excluded && !disable_skip && ref_frame != INTRA_FRAME &&
         cm->mcomp_filter_type != BILINEAR) {
       int64_t ref = cpi->rd_filter_cache[cm->mcomp_filter_type == SWITCHABLE ?
                               SWITCHABLE_FILTERS : cm->mcomp_filter_type];
       for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++) {
         int64_t adj_rd;
         // In cases of poor prediction, filter_cache[] can contain really big
         // values, which actually are bigger than this_rd itself. This can
         // cause negative best_filter_rd[] values, which is obviously silly.
         // Therefore, if filter_cache < ref, we do an adjusted calculation.
         if (cpi->rd_filter_cache[i] >= ref) {
           adj_rd = this_rd + cpi->rd_filter_cache[i] - ref;
         } else {
           // FIXME(rbultje) do this for comppsred also
           //
           // To prevent out-of-range computation in
           //    adj_rd = cpi->rd_filter_cache[i] * this_rd / ref
           // cpi->rd_filter_cache[i] / ref is converted to a 256 based ratio.
           int tmp = cpi->rd_filter_cache[i] * 256 / ref;
           adj_rd = (this_rd * tmp) >> 8;
         }
         best_filter_rd[i] = MIN(best_filter_rd[i], adj_rd);
       }
     }
     /* keep record of best txfm size */
     if (bsize < BLOCK_32X32) {
       if (bsize < BLOCK_16X16)
         tx_cache[ALLOW_16X16] = tx_cache[ALLOW_8X8];
       tx_cache[ALLOW_32X32] = tx_cache[ALLOW_16X16];
     }
     if (!mode_excluded && this_rd != INT64_MAX) {
       for (i = 0; i < TX_MODES && tx_cache[i] < INT64_MAX; i++) {
         int64_t adj_rd = INT64_MAX;
         adj_rd = this_rd + tx_cache[i] - tx_cache[cm->tx_mode];
         if (adj_rd < best_tx_rd[i])
           best_tx_rd[i] = adj_rd;
       }
     }
     if (early_term)
       break;
     if (x->skip && !comp_pred)
       break;
   }
   if (best_rd >= best_rd_so_far)
     return INT64_MAX;
   // If we used an estimate for the uv intra rd in the loop above...
   if (cpi->sf.use_uv_intra_rd_estimate) {
     // Do Intra UV best rd mode selection if best mode choice above was intra.
     if (vp9_mode_order[best_mode_index].ref_frame == INTRA_FRAME) {
       TX_SIZE uv_tx_size = get_uv_tx_size(mbmi);
       rd_pick_intra_sbuv_mode(cpi, x, ctx, &rate_uv_intra[uv_tx_size],
                               &rate_uv_tokenonly[uv_tx_size],
                               &dist_uv[uv_tx_size],
                               &skip_uv[uv_tx_size],
                               bsize < BLOCK_8X8 ? BLOCK_8X8 : bsize);
     }
   }
   // If we are using reference masking and the set mask flag is set then
   // create the reference frame mask.
   if (cpi->sf.reference_masking && cpi->set_ref_frame_mask)
     cpi->ref_frame_mask = ~(1 << vp9_mode_order[best_mode_index].ref_frame);
   // Flag all modes that have a distortion thats > 2x the best we found at
   // this level.
   for (mode_index = 0; mode_index < MB_MODE_COUNT; ++mode_index) {
     if (mode_index == NEARESTMV || mode_index == NEARMV || mode_index == NEWMV)
       continue;
     if (mode_distortions[mode_index] > 2 * *returndistortion) {
       ctx->modes_with_high_error |= (1 << mode_index);
     }
   }
   // Flag all ref frames that have a distortion thats > 2x the best we found at
   // this level.
   for (ref_frame = INTRA_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
     if (frame_distortions[ref_frame] > 2 * *returndistortion) {
       ctx->frames_with_high_error |= (1 << ref_frame);
     }
   }
   assert((cm->mcomp_filter_type == SWITCHABLE) ||
          (cm->mcomp_filter_type == best_mbmode.interp_filter) ||
          (best_mbmode.ref_frame[0] == INTRA_FRAME));
   // Updating rd_thresh_freq_fact[] here means that the different
   // partition/block sizes are handled independently based on the best
   // choice for the current partition. It may well be better to keep a scaled
   // best rd so far value and update rd_thresh_freq_fact based on the mode/size
   // combination that wins out.
   if (cpi->sf.adaptive_rd_thresh) {
     for (mode_index = 0; mode_index < MAX_MODES; ++mode_index) {
       if (mode_index == best_mode_index) {
         cpi->rd_thresh_freq_fact[bsize][mode_index] -=
           (cpi->rd_thresh_freq_fact[bsize][mode_index] >> 3);
       } else {
         cpi->rd_thresh_freq_fact[bsize][mode_index] += RD_THRESH_INC;
         if (cpi->rd_thresh_freq_fact[bsize][mode_index] >
             (cpi->sf.adaptive_rd_thresh * RD_THRESH_MAX_FACT)) {
           cpi->rd_thresh_freq_fact[bsize][mode_index] =
             cpi->sf.adaptive_rd_thresh * RD_THRESH_MAX_FACT;
         }
       }
     }
   }
   // macroblock modes
   *mbmi = best_mbmode;
   x->skip |= best_skip2;
   for (i = 0; i < NB_PREDICTION_TYPES; ++i) {
     if (best_pred_rd[i] == INT64_MAX)
       best_pred_diff[i] = INT_MIN;
     else
       best_pred_diff[i] = best_rd - best_pred_rd[i];
   }
   if (!x->skip) {
     for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++) {
       if (best_filter_rd[i] == INT64_MAX)
         best_filter_diff[i] = 0;
       else
         best_filter_diff[i] = best_rd - best_filter_rd[i];
     }
     if (cm->mcomp_filter_type == SWITCHABLE)
       assert(best_filter_diff[SWITCHABLE_FILTERS] == 0);
   } else {
     vp9_zero(best_filter_diff);
   }
   if (!x->skip) {
     for (i = 0; i < TX_MODES; i++) {
       if (best_tx_rd[i] == INT64_MAX)
         best_tx_diff[i] = 0;
       else
         best_tx_diff[i] = best_rd - best_tx_rd[i];
     }
   } else {
     vp9_zero(best_tx_diff);
   }
   set_scale_factors(xd, mbmi->ref_frame[0], mbmi->ref_frame[1],
                     scale_factor);
   store_coding_context(x, ctx, best_mode_index,
                        &mbmi->ref_mvs[mbmi->ref_frame[0]][0],
                        &mbmi->ref_mvs[mbmi->ref_frame[1] < 0 ? 0 :
                                       mbmi->ref_frame[1]][0],
                        best_pred_diff, best_tx_diff, best_filter_diff);
   return best_rd;
 }
 int64_t vp9_rd_pick_inter_mode_sub8x8(VP9_COMP *cpi, MACROBLOCK *x,
                                       const TileInfo *const tile,
                                       int mi_row, int mi_col,
                                       int *returnrate,
                                       int64_t *returndistortion,
                                       BLOCK_SIZE bsize,
                                       PICK_MODE_CONTEXT *ctx,
                                       int64_t best_rd_so_far) {
   VP9_COMMON *cm = &cpi->common;
   MACROBLOCKD *xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   const struct segmentation *seg = &cm->seg;
   const BLOCK_SIZE block_size = get_plane_block_size(bsize, &xd->plane[0]);
   MV_REFERENCE_FRAME ref_frame, second_ref_frame;
   unsigned char segment_id = mbmi->segment_id;
   int comp_pred, i;
   int_mv frame_mv[MB_MODE_COUNT][MAX_REF_FRAMES];
   struct buf_2d yv12_mb[4][MAX_MB_PLANE];
   static const int flag_list[4] = { 0, VP9_LAST_FLAG, VP9_GOLD_FLAG,
                                     VP9_ALT_FLAG };
   int idx_list[4] = {0,
                      cpi->lst_fb_idx,
                      cpi->gld_fb_idx,
                      cpi->alt_fb_idx};
   int64_t best_rd = best_rd_so_far;
   int64_t best_yrd = best_rd_so_far;  // FIXME(rbultje) more precise
   int64_t best_tx_rd[TX_MODES];
   int64_t best_tx_diff[TX_MODES];
   int64_t best_pred_diff[NB_PREDICTION_TYPES];
   int64_t best_pred_rd[NB_PREDICTION_TYPES];
   int64_t best_filter_rd[SWITCHABLE_FILTER_CONTEXTS];
   int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS];
   MB_MODE_INFO best_mbmode = { 0 };
   int mode_index, best_mode_index = 0;
   unsigned int ref_costs_single[MAX_REF_FRAMES], ref_costs_comp[MAX_REF_FRAMES];
   vp9_prob comp_mode_p;
   int64_t best_inter_rd = INT64_MAX;
   MV_REFERENCE_FRAME best_inter_ref_frame = LAST_FRAME;
   INTERPOLATION_TYPE tmp_best_filter = SWITCHABLE;
   int rate_uv_intra[TX_SIZES], rate_uv_tokenonly[TX_SIZES];
   int64_t dist_uv[TX_SIZES];
   int skip_uv[TX_SIZES];
   MB_PREDICTION_MODE mode_uv[TX_SIZES] = { 0 };
   struct scale_factors scale_factor[4];
   unsigned int ref_frame_mask = 0;
   unsigned int mode_mask = 0;
   int intra_cost_penalty = 20 * vp9_dc_quant(cpi->common.base_qindex,
                                              cpi->common.y_dc_delta_q);
   int_mv seg_mvs[4][MAX_REF_FRAMES];
   b_mode_info best_bmodes[4];
   int best_skip2 = 0;
   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;
   vpx_memset(x->zcoeff_blk[TX_4X4], 0, 4);
   for (i = 0; i < 4; i++) {
     int j;
     for (j = 0; j < MAX_REF_FRAMES; j++)
       seg_mvs[i][j].as_int = INVALID_MV;
   }
   estimate_ref_frame_costs(cpi, segment_id, ref_costs_single, ref_costs_comp,
                            &comp_mode_p);
   for (i = 0; i < NB_PREDICTION_TYPES; ++i)
     best_pred_rd[i] = INT64_MAX;
   for (i = 0; i < TX_MODES; i++)
     best_tx_rd[i] = INT64_MAX;
   for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
     best_filter_rd[i] = INT64_MAX;
   for (i = 0; i < TX_SIZES; i++)
     rate_uv_intra[i] = INT_MAX;
   *returnrate = INT_MAX;
   // Create a mask set to 1 for each reference frame used by a smaller
   // resolution.
   if (cpi->sf.use_avoid_tested_higherror) {
     ref_frame_mask = 0;
     mode_mask = 0;
     ref_frame_mask = ~ref_frame_mask;
     mode_mask = ~mode_mask;
   }
   for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
     if (cpi->ref_frame_flags & flag_list[ref_frame]) {
       setup_buffer_inter(cpi, x, tile, idx_list[ref_frame], ref_frame,
                          block_size, mi_row, mi_col,
                          frame_mv[NEARESTMV], frame_mv[NEARMV],
                          yv12_mb, scale_factor);
     }
     frame_mv[NEWMV][ref_frame].as_int = INVALID_MV;
     frame_mv[ZEROMV][ref_frame].as_int = 0;
   }
   for (mode_index = 0; mode_index < MAX_REFS; ++mode_index) {
     int mode_excluded = 0;
     int64_t this_rd = INT64_MAX;
     int disable_skip = 0;
     int compmode_cost = 0;
     int rate2 = 0, rate_y = 0, rate_uv = 0;
     int64_t distortion2 = 0, distortion_y = 0, distortion_uv = 0;
     int skippable = 0;
     int64_t tx_cache[TX_MODES];
     int i;
     int this_skip2 = 0;
     int64_t total_sse = INT_MAX;
     int early_term = 0;
     for (i = 0; i < TX_MODES; ++i)
       tx_cache[i] = INT64_MAX;
     x->skip = 0;
     ref_frame = vp9_ref_order[mode_index].ref_frame;
     second_ref_frame = vp9_ref_order[mode_index].second_ref_frame;
     // Look at the reference frame of the best mode so far and set the
     // skip mask to look at a subset of the remaining modes.
     if (mode_index > 2 && cpi->sf.mode_skip_start < MAX_MODES) {
       if (mode_index == 3) {
         switch (vp9_ref_order[best_mode_index].ref_frame) {
           case INTRA_FRAME:
             cpi->mode_skip_mask = 0;
             break;
           case LAST_FRAME:
             cpi->mode_skip_mask = 0x0010;
             break;
           case GOLDEN_FRAME:
             cpi->mode_skip_mask = 0x0008;
             break;
           case ALTREF_FRAME:
             cpi->mode_skip_mask = 0x0000;
             break;
           case NONE:
           case MAX_REF_FRAMES:
             assert(!"Invalid Reference frame");
         }
       }
       if (cpi->mode_skip_mask & ((int64_t)1 << mode_index))
         continue;
     }
     // Skip if the current reference frame has been masked off
     if (cpi->sf.reference_masking && !cpi->set_ref_frame_mask &&
         (cpi->ref_frame_mask & (1 << ref_frame)))
       continue;
     // Test best rd so far against threshold for trying this mode.
     if ((best_rd <
          ((int64_t)cpi->rd_thresh_sub8x8[segment_id][bsize][mode_index] *
           cpi->rd_thresh_freq_sub8x8[bsize][mode_index] >> 5)) ||
         cpi->rd_thresh_sub8x8[segment_id][bsize][mode_index] == INT_MAX)
       continue;
     // Do not allow compound prediction if the segment level reference
     // frame feature is in use as in this case there can only be one reference.
     if ((second_ref_frame > INTRA_FRAME) &&
          vp9_segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME))
       continue;
     mbmi->ref_frame[0] = ref_frame;
     mbmi->ref_frame[1] = second_ref_frame;
     if (!(ref_frame == INTRA_FRAME
         || (cpi->ref_frame_flags & flag_list[ref_frame]))) {
       continue;
     }
     if (!(second_ref_frame == NONE
         || (cpi->ref_frame_flags & flag_list[second_ref_frame]))) {
       continue;
     }
     comp_pred = second_ref_frame > INTRA_FRAME;
     if (comp_pred) {
       if (cpi->sf.mode_search_skip_flags & FLAG_SKIP_COMP_BESTINTRA)
         if (vp9_ref_order[best_mode_index].ref_frame == INTRA_FRAME)
           continue;
       if (cpi->sf.mode_search_skip_flags & FLAG_SKIP_COMP_REFMISMATCH)
         if (ref_frame != best_inter_ref_frame &&
             second_ref_frame != best_inter_ref_frame)
           continue;
     }
     // TODO(jingning, jkoleszar): scaling reference frame not supported for
     // sub8x8 blocks.
     if (ref_frame > 0 &&
         vp9_is_scaled(scale_factor[ref_frame].sfc))
       continue;
     if (second_ref_frame > 0 &&
         vp9_is_scaled(scale_factor[second_ref_frame].sfc))
       continue;
     set_scale_factors(xd, ref_frame, second_ref_frame, scale_factor);
     mbmi->uv_mode = DC_PRED;
     // Evaluate all sub-pel filters irrespective of whether we can use
     // them for this frame.
     mbmi->interp_filter = cm->mcomp_filter_type;
     vp9_setup_interp_filters(xd, mbmi->interp_filter, &cpi->common);
     if (comp_pred) {
       if (!(cpi->ref_frame_flags & flag_list[second_ref_frame]))
         continue;
       set_scale_factors(xd, ref_frame, second_ref_frame, scale_factor);
       mode_excluded = mode_excluded
                          ? mode_excluded
                          : cm->comp_pred_mode == SINGLE_PREDICTION_ONLY;
     } else {
       if (ref_frame != INTRA_FRAME && second_ref_frame != INTRA_FRAME) {
         mode_excluded =
             mode_excluded ?
                 mode_excluded : cm->comp_pred_mode == COMP_PREDICTION_ONLY;
       }
     }
     // Select prediction reference frames.
     for (i = 0; i < MAX_MB_PLANE; i++) {
       xd->plane[i].pre[0] = yv12_mb[ref_frame][i];
       if (comp_pred)
         xd->plane[i].pre[1] = yv12_mb[second_ref_frame][i];
     }
     // If the segment reference frame feature is enabled....
     // then do nothing if the current ref frame is not allowed..
     if (vp9_segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME) &&
         vp9_get_segdata(seg, segment_id, SEG_LVL_REF_FRAME) !=
             (int)ref_frame) {
       continue;
     // If the segment skip feature is enabled....
     // then do nothing if the current mode is not allowed..
     } else if (vp9_segfeature_active(seg, segment_id, SEG_LVL_SKIP) &&
                ref_frame != INTRA_FRAME) {
       continue;
     // Disable this drop out case if the ref frame
     // segment level feature is enabled for this segment. This is to
     // prevent the possibility that we end up unable to pick any mode.
     } else if (!vp9_segfeature_active(seg, segment_id,
                                       SEG_LVL_REF_FRAME)) {
       // Only consider ZEROMV/ALTREF_FRAME for alt ref frame,
       // unless ARNR filtering is enabled in which case we want
       // an unfiltered alternative. We allow near/nearest as well
       // because they may result in zero-zero MVs but be cheaper.
       if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames == 0))
         continue;
     }
 #ifdef MODE_TEST_HIT_STATS
     // TEST/DEBUG CODE
     // Keep a rcord of the number of test hits at each size
     cpi->mode_test_hits[bsize]++;
 #endif
     if (ref_frame == INTRA_FRAME) {
       int rate;
       mbmi->tx_size = TX_4X4;
       if (rd_pick_intra_sub_8x8_y_mode(cpi, x, &rate, &rate_y,
                                        &distortion_y, best_rd) >= best_rd)
         continue;
       rate2 += rate;
       rate2 += intra_cost_penalty;
       distortion2 += distortion_y;
       if (rate_uv_intra[TX_4X4] == INT_MAX) {
         choose_intra_uv_mode(cpi, ctx, bsize, &rate_uv_intra[TX_4X4],
                              &rate_uv_tokenonly[TX_4X4],
                              &dist_uv[TX_4X4], &skip_uv[TX_4X4],
                              &mode_uv[TX_4X4]);
       }
       rate2 += rate_uv_intra[TX_4X4];
       rate_uv = rate_uv_tokenonly[TX_4X4];
       distortion2 += dist_uv[TX_4X4];
       distortion_uv = dist_uv[TX_4X4];
       mbmi->uv_mode = mode_uv[TX_4X4];
       tx_cache[ONLY_4X4] = RDCOST(x->rdmult, x->rddiv, rate2, distortion2);
       for (i = 0; i < TX_MODES; ++i)
         tx_cache[i] = tx_cache[ONLY_4X4];
     } else {
       int rate;
       int64_t distortion;
       int64_t this_rd_thresh;
       int64_t tmp_rd, tmp_best_rd = INT64_MAX, tmp_best_rdu = INT64_MAX;
       int tmp_best_rate = INT_MAX, tmp_best_ratey = INT_MAX;
       int64_t tmp_best_distortion = INT_MAX, tmp_best_sse, uv_sse;
       int tmp_best_skippable = 0;
       int switchable_filter_index;
       int_mv *second_ref = comp_pred ?
                              &mbmi->ref_mvs[second_ref_frame][0] : NULL;
       b_mode_info tmp_best_bmodes[16];
       MB_MODE_INFO tmp_best_mbmode;
       BEST_SEG_INFO bsi[SWITCHABLE_FILTERS];
       int pred_exists = 0;
       int uv_skippable;
       this_rd_thresh = (ref_frame == LAST_FRAME) ?
           cpi->rd_thresh_sub8x8[segment_id][bsize][THR_LAST] :
           cpi->rd_thresh_sub8x8[segment_id][bsize][THR_ALTR];
       this_rd_thresh = (ref_frame == GOLDEN_FRAME) ?
           cpi->rd_thresh_sub8x8[segment_id][bsize][THR_GOLD] : this_rd_thresh;
       xd->mi_8x8[0]->mbmi.tx_size = TX_4X4;
       cpi->rd_filter_cache[SWITCHABLE_FILTERS] = INT64_MAX;
       if (cm->mcomp_filter_type != BILINEAR) {
         tmp_best_filter = EIGHTTAP;
         if (x->source_variance <
             cpi->sf.disable_filter_search_var_thresh) {
           tmp_best_filter = EIGHTTAP;
           vp9_zero(cpi->rd_filter_cache);
         } else {
           for (switchable_filter_index = 0;
                switchable_filter_index < SWITCHABLE_FILTERS;
                ++switchable_filter_index) {
             int newbest, rs;
             int64_t rs_rd;
             mbmi->interp_filter = switchable_filter_index;
             vp9_setup_interp_filters(xd, mbmi->interp_filter, &cpi->common);
             tmp_rd = rd_pick_best_mbsegmentation(cpi, x, tile,
                                                  &mbmi->ref_mvs[ref_frame][0],
                                                  second_ref,
                                                  best_yrd,
                                                  &rate, &rate_y, &distortion,
                                                  &skippable, &total_sse,
                                                  (int)this_rd_thresh, seg_mvs,
                                                  bsi, switchable_filter_index,
                                                  mi_row, mi_col);
             if (tmp_rd == INT64_MAX)
               continue;
             cpi->rd_filter_cache[switchable_filter_index] = tmp_rd;
             rs = get_switchable_rate(x);
             rs_rd = RDCOST(x->rdmult, x->rddiv, rs, 0);
             cpi->rd_filter_cache[SWITCHABLE_FILTERS] =
                 MIN(cpi->rd_filter_cache[SWITCHABLE_FILTERS],
                     tmp_rd + rs_rd);
             if (cm->mcomp_filter_type == SWITCHABLE)
               tmp_rd += rs_rd;
             newbest = (tmp_rd < tmp_best_rd);
             if (newbest) {
               tmp_best_filter = mbmi->interp_filter;
               tmp_best_rd = tmp_rd;
             }
             if ((newbest && cm->mcomp_filter_type == SWITCHABLE) ||
                 (mbmi->interp_filter == cm->mcomp_filter_type &&
                  cm->mcomp_filter_type != SWITCHABLE)) {
               tmp_best_rdu = tmp_rd;
               tmp_best_rate = rate;
               tmp_best_ratey = rate_y;
               tmp_best_distortion = distortion;
               tmp_best_sse = total_sse;
               tmp_best_skippable = skippable;
               tmp_best_mbmode = *mbmi;
               for (i = 0; i < 4; i++) {
                 tmp_best_bmodes[i] = xd->mi_8x8[0]->bmi[i];
                 x->zcoeff_blk[TX_4X4][i] = !xd->plane[0].eobs[i];
               }
               pred_exists = 1;
               if (switchable_filter_index == 0 &&
                   cpi->sf.use_rd_breakout &&
                   best_rd < INT64_MAX) {
                 if (tmp_best_rdu / 2 > best_rd) {
                   // skip searching the other filters if the first is
                   // already substantially larger than the best so far
                   tmp_best_filter = mbmi->interp_filter;
                   tmp_best_rdu = INT64_MAX;
                   break;
                 }
               }
             }
           }  // switchable_filter_index loop
         }
       }
       if (tmp_best_rdu == INT64_MAX)
         continue;
       mbmi->interp_filter = (cm->mcomp_filter_type == SWITCHABLE ?
                              tmp_best_filter : cm->mcomp_filter_type);
       vp9_setup_interp_filters(xd, mbmi->interp_filter, &cpi->common);
       if (!pred_exists) {
         // Handles the special case when a filter that is not in the
         // switchable list (bilinear, 6-tap) is indicated at the frame level
         tmp_rd = rd_pick_best_mbsegmentation(cpi, x, tile,
                      &mbmi->ref_mvs[ref_frame][0],
                      second_ref,
                      best_yrd,
                      &rate, &rate_y, &distortion,
                      &skippable, &total_sse,
                      (int)this_rd_thresh, seg_mvs,
                      bsi, 0,
                      mi_row, mi_col);
         if (tmp_rd == INT64_MAX)
           continue;
       } else {
         if (cpi->common.mcomp_filter_type == SWITCHABLE) {
           int rs = get_switchable_rate(x);
           tmp_best_rdu -= RDCOST(x->rdmult, x->rddiv, rs, 0);
         }
         tmp_rd = tmp_best_rdu;
         total_sse = tmp_best_sse;
         rate = tmp_best_rate;
         rate_y = tmp_best_ratey;
         distortion = tmp_best_distortion;
         skippable = tmp_best_skippable;
         *mbmi = tmp_best_mbmode;
         for (i = 0; i < 4; i++)
           xd->mi_8x8[0]->bmi[i] = tmp_best_bmodes[i];
       }
       rate2 += rate;
       distortion2 += distortion;
       if (cpi->common.mcomp_filter_type == SWITCHABLE)
         rate2 += get_switchable_rate(x);
       if (!mode_excluded) {
         if (comp_pred)
           mode_excluded = cpi->common.comp_pred_mode == SINGLE_PREDICTION_ONLY;
         else
           mode_excluded = cpi->common.comp_pred_mode == COMP_PREDICTION_ONLY;
       }
       compmode_cost = vp9_cost_bit(comp_mode_p, comp_pred);
       tmp_best_rdu = best_rd -
           MIN(RDCOST(x->rdmult, x->rddiv, rate2, distortion2),
               RDCOST(x->rdmult, x->rddiv, 0, total_sse));
       if (tmp_best_rdu > 0) {
         // If even the 'Y' rd value of split is higher than best so far
         // then dont bother looking at UV
         vp9_build_inter_predictors_sbuv(&x->e_mbd, mi_row, mi_col,
                                         BLOCK_8X8);
         super_block_uvrd(cpi, x, &rate_uv, &distortion_uv, &uv_skippable,
                          &uv_sse, BLOCK_8X8, tmp_best_rdu);
         if (rate_uv == INT_MAX)
           continue;
         rate2 += rate_uv;
         distortion2 += distortion_uv;
         skippable = skippable && uv_skippable;
         total_sse += uv_sse;
         tx_cache[ONLY_4X4] = RDCOST(x->rdmult, x->rddiv, rate2, distortion2);
         for (i = 0; i < TX_MODES; ++i)
           tx_cache[i] = tx_cache[ONLY_4X4];
       }
     }
     if (cpi->common.comp_pred_mode == HYBRID_PREDICTION) {
       rate2 += compmode_cost;
     }
     // Estimate the reference frame signaling cost and add it
     // to the rolling cost variable.
     if (second_ref_frame > INTRA_FRAME) {
       rate2 += ref_costs_comp[ref_frame];
     } else {
       rate2 += ref_costs_single[ref_frame];
     }
     if (!disable_skip) {
       // Test for the condition where skip block will be activated
       // because there are no non zero coefficients and make any
       // necessary adjustment for rate. Ignore if skip is coded at
       // segment level as the cost wont have been added in.
       // Is Mb level skip allowed (i.e. not coded at segment level).
       const int mb_skip_allowed = !vp9_segfeature_active(seg, segment_id,
                                                          SEG_LVL_SKIP);
       if (mb_skip_allowed && ref_frame != INTRA_FRAME && !xd->lossless) {
         if (RDCOST(x->rdmult, x->rddiv, rate_y + rate_uv, distortion2) <
             RDCOST(x->rdmult, x->rddiv, 0, total_sse)) {
           // Add in the cost of the no skip flag.
           int prob_skip_cost = vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd),
 );
           rate2 += prob_skip_cost;
         } else {
           // FIXME(rbultje) make this work for splitmv also
           int prob_skip_cost = vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd),
 );
           rate2 += prob_skip_cost;
           distortion2 = total_sse;
           assert(total_sse >= 0);
           rate2 -= (rate_y + rate_uv);
           rate_y = 0;
           rate_uv = 0;
           this_skip2 = 1;
         }
       } else if (mb_skip_allowed) {
         // Add in the cost of the no skip flag.
         int prob_skip_cost = vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd),
 );
         rate2 += prob_skip_cost;
       }
       // Calculate the final RD estimate for this mode.
       this_rd = RDCOST(x->rdmult, x->rddiv, rate2, distortion2);
     }
     // Keep record of best inter rd with single reference
     if (xd->mi_8x8[0]->mbmi.ref_frame[0] > INTRA_FRAME &&
         xd->mi_8x8[0]->mbmi.ref_frame[1] == NONE &&
         !mode_excluded &&
         this_rd < best_inter_rd) {
       best_inter_rd = this_rd;
       best_inter_ref_frame = ref_frame;
     }
     if (!disable_skip && ref_frame == INTRA_FRAME) {
       for (i = 0; i < NB_PREDICTION_TYPES; ++i)
         best_pred_rd[i] = MIN(best_pred_rd[i], this_rd);
       for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
         best_filter_rd[i] = MIN(best_filter_rd[i], this_rd);
     }
     // Did this mode help.. i.e. is it the new best mode
     if (this_rd < best_rd || x->skip) {
       if (!mode_excluded) {
         int max_plane = MAX_MB_PLANE;
         // Note index of best mode so far
         best_mode_index = mode_index;
         if (ref_frame == INTRA_FRAME) {
           /* required for left and above block mv */
           mbmi->mv[0].as_int = 0;
           max_plane = 1;
         }
         *returnrate = rate2;
         *returndistortion = distortion2;
         best_rd = this_rd;
         best_yrd = best_rd -
                    RDCOST(x->rdmult, x->rddiv, rate_uv, distortion_uv);
         best_mbmode = *mbmi;
         best_skip2 = this_skip2;
         if (!x->select_txfm_size)
           swap_block_ptr(x, ctx, max_plane);
         vpx_memcpy(ctx->zcoeff_blk, x->zcoeff_blk[mbmi->tx_size],
                    sizeof(uint8_t) * ctx->num_4x4_blk);
         for (i = 0; i < 4; i++)
           best_bmodes[i] = xd->mi_8x8[0]->bmi[i];
         // TODO(debargha): enhance this test with a better distortion prediction
         // based on qp, activity mask and history
         if ((cpi->sf.mode_search_skip_flags & FLAG_EARLY_TERMINATE) &&
             (mode_index > MIN_EARLY_TERM_INDEX)) {
           const int qstep = xd->plane[0].dequant[1];
           // TODO(debargha): Enhance this by specializing for each mode_index
           int scale = 4;
           if (x->source_variance < UINT_MAX) {
             const int var_adjust = (x->source_variance < 16);
             scale -= var_adjust;
           }
           if (ref_frame > INTRA_FRAME &&
               distortion2 * scale < qstep * qstep) {
             early_term = 1;
           }
         }
       }
     }
     /* keep record of best compound/single-only prediction */
     if (!disable_skip && ref_frame != INTRA_FRAME) {
       int single_rd, hybrid_rd, single_rate, hybrid_rate;
       if (cpi->common.comp_pred_mode == HYBRID_PREDICTION) {
         single_rate = rate2 - compmode_cost;
         hybrid_rate = rate2;
       } else {
         single_rate = rate2;
         hybrid_rate = rate2 + compmode_cost;
       }
       single_rd = RDCOST(x->rdmult, x->rddiv, single_rate, distortion2);
       hybrid_rd = RDCOST(x->rdmult, x->rddiv, hybrid_rate, distortion2);
       if (second_ref_frame <= INTRA_FRAME &&
           single_rd < best_pred_rd[SINGLE_PREDICTION_ONLY]) {
         best_pred_rd[SINGLE_PREDICTION_ONLY] = single_rd;
       } else if (second_ref_frame > INTRA_FRAME &&
                  single_rd < best_pred_rd[COMP_PREDICTION_ONLY]) {
         best_pred_rd[COMP_PREDICTION_ONLY] = single_rd;
       }
       if (hybrid_rd < best_pred_rd[HYBRID_PREDICTION])
         best_pred_rd[HYBRID_PREDICTION] = hybrid_rd;
     }
     /* keep record of best filter type */
     if (!mode_excluded && !disable_skip && ref_frame != INTRA_FRAME &&
         cm->mcomp_filter_type != BILINEAR) {
       int64_t ref = cpi->rd_filter_cache[cm->mcomp_filter_type == SWITCHABLE ?
                               SWITCHABLE_FILTERS : cm->mcomp_filter_type];
       for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++) {
         int64_t adj_rd;
         // In cases of poor prediction, filter_cache[] can contain really big
         // values, which actually are bigger than this_rd itself. This can
         // cause negative best_filter_rd[] values, which is obviously silly.
         // Therefore, if filter_cache < ref, we do an adjusted calculation.
         if (cpi->rd_filter_cache[i] >= ref)
           adj_rd = this_rd + cpi->rd_filter_cache[i] - ref;
         else  // FIXME(rbultje) do this for comppred also
           adj_rd = this_rd - (ref - cpi->rd_filter_cache[i]) * this_rd / ref;
         best_filter_rd[i] = MIN(best_filter_rd[i], adj_rd);
       }
     }
     /* keep record of best txfm size */
     if (bsize < BLOCK_32X32) {
       if (bsize < BLOCK_16X16) {
         tx_cache[ALLOW_8X8] = tx_cache[ONLY_4X4];
         tx_cache[ALLOW_16X16] = tx_cache[ALLOW_8X8];
       }
       tx_cache[ALLOW_32X32] = tx_cache[ALLOW_16X16];
     }
     if (!mode_excluded && this_rd != INT64_MAX) {
       for (i = 0; i < TX_MODES && tx_cache[i] < INT64_MAX; i++) {
         int64_t adj_rd = INT64_MAX;
         if (ref_frame > INTRA_FRAME)
           adj_rd = this_rd + tx_cache[i] - tx_cache[cm->tx_mode];
         else
           adj_rd = this_rd;
         if (adj_rd < best_tx_rd[i])
           best_tx_rd[i] = adj_rd;
       }
     }
     if (early_term)
       break;
     if (x->skip && !comp_pred)
       break;
   }
   if (best_rd >= best_rd_so_far)
     return INT64_MAX;
   // If we used an estimate for the uv intra rd in the loop above...
   if (cpi->sf.use_uv_intra_rd_estimate) {
     // Do Intra UV best rd mode selection if best mode choice above was intra.
     if (vp9_ref_order[best_mode_index].ref_frame == INTRA_FRAME) {
       TX_SIZE uv_tx_size = get_uv_tx_size(mbmi);
       rd_pick_intra_sbuv_mode(cpi, x, ctx, &rate_uv_intra[uv_tx_size],
                               &rate_uv_tokenonly[uv_tx_size],
                               &dist_uv[uv_tx_size],
                               &skip_uv[uv_tx_size],
                               BLOCK_8X8);
     }
   }
   // If we are using reference masking and the set mask flag is set then
   // create the reference frame mask.
   if (cpi->sf.reference_masking && cpi->set_ref_frame_mask)
     cpi->ref_frame_mask = ~(1 << vp9_ref_order[best_mode_index].ref_frame);
   if (best_rd == INT64_MAX && bsize < BLOCK_8X8) {
     *returnrate = INT_MAX;
     *returndistortion = INT_MAX;
     return best_rd;
   }
   assert((cm->mcomp_filter_type == SWITCHABLE) ||
          (cm->mcomp_filter_type == best_mbmode.interp_filter) ||
          (best_mbmode.ref_frame[0] == INTRA_FRAME));
   // Updating rd_thresh_freq_fact[] here means that the different
   // partition/block sizes are handled independently based on the best
   // choice for the current partition. It may well be better to keep a scaled
   // best rd so far value and update rd_thresh_freq_fact based on the mode/size
   // combination that wins out.
   if (cpi->sf.adaptive_rd_thresh) {
     for (mode_index = 0; mode_index < MAX_REFS; ++mode_index) {
       if (mode_index == best_mode_index) {
         cpi->rd_thresh_freq_sub8x8[bsize][mode_index] -=
           (cpi->rd_thresh_freq_sub8x8[bsize][mode_index] >> 3);
       } else {
         cpi->rd_thresh_freq_sub8x8[bsize][mode_index] += RD_THRESH_INC;
         if (cpi->rd_thresh_freq_sub8x8[bsize][mode_index] >
             (cpi->sf.adaptive_rd_thresh * RD_THRESH_MAX_FACT)) {
           cpi->rd_thresh_freq_sub8x8[bsize][mode_index] =
             cpi->sf.adaptive_rd_thresh * RD_THRESH_MAX_FACT;
         }
       }
     }
   }
   // macroblock modes
   *mbmi = best_mbmode;
   x->skip |= best_skip2;
   if (best_mbmode.ref_frame[0] == INTRA_FRAME) {
     for (i = 0; i < 4; i++)
       xd->mi_8x8[0]->bmi[i].as_mode = best_bmodes[i].as_mode;
   } else {
     for (i = 0; i < 4; ++i)
       vpx_memcpy(&xd->mi_8x8[0]->bmi[i], &best_bmodes[i], sizeof(b_mode_info));
     mbmi->mv[0].as_int = xd->mi_8x8[0]->bmi[3].as_mv[0].as_int;
     mbmi->mv[1].as_int = xd->mi_8x8[0]->bmi[3].as_mv[1].as_int;
   }
   for (i = 0; i < NB_PREDICTION_TYPES; ++i) {
     if (best_pred_rd[i] == INT64_MAX)
       best_pred_diff[i] = INT_MIN;
     else
       best_pred_diff[i] = best_rd - best_pred_rd[i];
   }
   if (!x->skip) {
     for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++) {
       if (best_filter_rd[i] == INT64_MAX)
         best_filter_diff[i] = 0;
       else
         best_filter_diff[i] = best_rd - best_filter_rd[i];
     }
     if (cm->mcomp_filter_type == SWITCHABLE)
       assert(best_filter_diff[SWITCHABLE_FILTERS] == 0);
   } else {
     vp9_zero(best_filter_diff);
   }
   if (!x->skip) {
     for (i = 0; i < TX_MODES; i++) {
       if (best_tx_rd[i] == INT64_MAX)
         best_tx_diff[i] = 0;
       else
         best_tx_diff[i] = best_rd - best_tx_rd[i];
     }
   } else {
     vp9_zero(best_tx_diff);
   }
   set_scale_factors(xd, mbmi->ref_frame[0], mbmi->ref_frame[1],
                     scale_factor);
   store_coding_context(x, ctx, best_mode_index,
                        &mbmi->ref_mvs[mbmi->ref_frame[0]][0],
                        &mbmi->ref_mvs[mbmi->ref_frame[1] < 0 ? 0 :
                                       mbmi->ref_frame[1]][0],
                        best_pred_diff, best_tx_diff, best_filter_diff);
   return best_rd;
 }

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media/libvpx/vp9/encoder/vp9_rdopt.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_rdopt.c