The Tor Browser: media/libvpx/vp9/encoder/vp9_encodeframe.c@b8a032363ba2 (annotated)

media/libvpx/vp9/encoder/vp9_encodeframe.c@b8a032363ba2 (annotated)

media/libvpx/vp9/encoder/vp9_encodeframe.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  *  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 <limits.h>
 #include <math.h>
 #include <stdio.h>
 #include "./vp9_rtcd.h"
 #include "./vpx_config.h"
 #include "vpx_ports/vpx_timer.h"
 #include "vp9/common/vp9_common.h"
 #include "vp9/common/vp9_entropy.h"
 #include "vp9/common/vp9_entropymode.h"
 #include "vp9/common/vp9_extend.h"
 #include "vp9/common/vp9_findnearmv.h"
 #include "vp9/common/vp9_idct.h"
 #include "vp9/common/vp9_mvref_common.h"
 #include "vp9/common/vp9_pred_common.h"
 #include "vp9/common/vp9_quant_common.h"
 #include "vp9/common/vp9_reconintra.h"
 #include "vp9/common/vp9_reconinter.h"
 #include "vp9/common/vp9_seg_common.h"
 #include "vp9/common/vp9_tile_common.h"
 #include "vp9/encoder/vp9_encodeframe.h"
 #include "vp9/encoder/vp9_encodeintra.h"
 #include "vp9/encoder/vp9_encodemb.h"
 #include "vp9/encoder/vp9_encodemv.h"
 #include "vp9/encoder/vp9_onyx_int.h"
 #include "vp9/encoder/vp9_rdopt.h"
 #include "vp9/encoder/vp9_segmentation.h"
 #include "vp9/common/vp9_systemdependent.h"
 #include "vp9/encoder/vp9_tokenize.h"
 #include "vp9/encoder/vp9_vaq.h"
 #define DBG_PRNT_SEGMAP 0
 // #define ENC_DEBUG
 #ifdef ENC_DEBUG
 int enc_debug = 0;
 #endif
 static INLINE uint8_t *get_sb_index(MACROBLOCK *x, BLOCK_SIZE subsize) {
   switch (subsize) {
     case BLOCK_64X64:
     case BLOCK_64X32:
     case BLOCK_32X64:
     case BLOCK_32X32:
       return &x->sb_index;
     case BLOCK_32X16:
     case BLOCK_16X32:
     case BLOCK_16X16:
       return &x->mb_index;
     case BLOCK_16X8:
     case BLOCK_8X16:
     case BLOCK_8X8:
       return &x->b_index;
     case BLOCK_8X4:
     case BLOCK_4X8:
     case BLOCK_4X4:
       return &x->ab_index;
     default:
       assert(0);
       return NULL;
   }
 }
 static void encode_superblock(VP9_COMP *cpi, TOKENEXTRA **t, int output_enabled,
                               int mi_row, int mi_col, BLOCK_SIZE bsize);
 static void adjust_act_zbin(VP9_COMP *cpi, MACROBLOCK *x);
 /* activity_avg must be positive, or flat regions could get a zero weight
  *  (infinite lambda), which confounds analysis.
  * This also avoids the need for divide by zero checks in
  *  vp9_activity_masking().
  */
 #define ACTIVITY_AVG_MIN (64)
 /* Motion vector component magnitude threshold for defining fast motion. */
 #define FAST_MOTION_MV_THRESH (24)
 /* This is used as a reference when computing the source variance for the
  *  purposes of activity masking.
  * Eventually this should be replaced by custom no-reference routines,
  *  which will be faster.
  */
 static const uint8_t VP9_VAR_OFFS[64] = {
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128,
 , 128, 128, 128, 128, 128, 128, 128
 };
 static unsigned int get_sby_perpixel_variance(VP9_COMP *cpi, MACROBLOCK *x,
                                               BLOCK_SIZE bs) {
   unsigned int var, sse;
   var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
                            x->plane[0].src.stride,
                            VP9_VAR_OFFS, 0, &sse);
   return (var + (1 << (num_pels_log2_lookup[bs] - 1))) >>
       num_pels_log2_lookup[bs];
 }
 // Original activity measure from Tim T's code.
 static unsigned int tt_activity_measure(MACROBLOCK *x) {
   unsigned int act;
   unsigned int sse;
   /* TODO: This could also be done over smaller areas (8x8), but that would
    *  require extensive changes elsewhere, as lambda is assumed to be fixed
    *  over an entire MB in most of the code.
    * Another option is to compute four 8x8 variances, and pick a single
    *  lambda using a non-linear combination (e.g., the smallest, or second
    *  smallest, etc.).
    */
   act = vp9_variance16x16(x->plane[0].src.buf, x->plane[0].src.stride,
                           VP9_VAR_OFFS, 0, &sse);
   act <<= 4;
   /* If the region is flat, lower the activity some more. */
   if (act < 8 << 12)
     act = act < 5 << 12 ? act : 5 << 12;
   return act;
 }
 // Stub for alternative experimental activity measures.
 static unsigned int alt_activity_measure(MACROBLOCK *x, int use_dc_pred) {
   return vp9_encode_intra(x, use_dc_pred);
 }
 // Measure the activity of the current macroblock
 // What we measure here is TBD so abstracted to this function
 #define ALT_ACT_MEASURE 1
 static unsigned int mb_activity_measure(MACROBLOCK *x, int mb_row, int mb_col) {
   unsigned int mb_activity;
   if (ALT_ACT_MEASURE) {
     int use_dc_pred = (mb_col || mb_row) && (!mb_col || !mb_row);
     // Or use and alternative.
     mb_activity = alt_activity_measure(x, use_dc_pred);
   } else {
     // Original activity measure from Tim T's code.
     mb_activity = tt_activity_measure(x);
   }
   if (mb_activity < ACTIVITY_AVG_MIN)
     mb_activity = ACTIVITY_AVG_MIN;
   return mb_activity;
 }
 // Calculate an "average" mb activity value for the frame
 #define ACT_MEDIAN 0
 static void calc_av_activity(VP9_COMP *cpi, int64_t activity_sum) {
 #if ACT_MEDIAN
   // Find median: Simple n^2 algorithm for experimentation
   {
     unsigned int median;
     unsigned int i, j;
     unsigned int *sortlist;
     unsigned int tmp;
     // Create a list to sort to
     CHECK_MEM_ERROR(&cpi->common, sortlist, vpx_calloc(sizeof(unsigned int),
                     cpi->common.MBs));
     // Copy map to sort list
     vpx_memcpy(sortlist, cpi->mb_activity_map,
         sizeof(unsigned int) * cpi->common.MBs);
     // Ripple each value down to its correct position
     for (i = 1; i < cpi->common.MBs; i ++) {
       for (j = i; j > 0; j --) {
         if (sortlist[j] < sortlist[j - 1]) {
           // Swap values
           tmp = sortlist[j - 1];
           sortlist[j - 1] = sortlist[j];
           sortlist[j] = tmp;
         } else {
           break;
         }
       }
     }
     // Even number MBs so estimate median as mean of two either side.
     median = (1 + sortlist[cpi->common.MBs >> 1] +
         sortlist[(cpi->common.MBs >> 1) + 1]) >> 1;
     cpi->activity_avg = median;
     vpx_free(sortlist);
   }
 #else
   // Simple mean for now
   cpi->activity_avg = (unsigned int) (activity_sum / cpi->common.MBs);
 #endif  // ACT_MEDIAN
   if (cpi->activity_avg < ACTIVITY_AVG_MIN)
     cpi->activity_avg = ACTIVITY_AVG_MIN;
   // Experimental code: return fixed value normalized for several clips
   if (ALT_ACT_MEASURE)
     cpi->activity_avg = 100000;
 }
 #define USE_ACT_INDEX   0
 #define OUTPUT_NORM_ACT_STATS   0
 #if USE_ACT_INDEX
 // Calculate an activity index for each mb
 static void calc_activity_index(VP9_COMP *cpi, MACROBLOCK *x) {
   VP9_COMMON *const cm = &cpi->common;
   int mb_row, mb_col;
   int64_t act;
   int64_t a;
   int64_t b;
 #if OUTPUT_NORM_ACT_STATS
   FILE *f = fopen("norm_act.stt", "a");
   fprintf(f, "\n%12d\n", cpi->activity_avg);
 #endif
   // Reset pointers to start of activity map
   x->mb_activity_ptr = cpi->mb_activity_map;
   // Calculate normalized mb activity number.
   for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
     // for each macroblock col in image
     for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
       // Read activity from the map
       act = *(x->mb_activity_ptr);
       // Calculate a normalized activity number
       a = act + 4 * cpi->activity_avg;
       b = 4 * act + cpi->activity_avg;
       if (b >= a)
       *(x->activity_ptr) = (int)((b + (a >> 1)) / a) - 1;
       else
       *(x->activity_ptr) = 1 - (int)((a + (b >> 1)) / b);
 #if OUTPUT_NORM_ACT_STATS
       fprintf(f, " %6d", *(x->mb_activity_ptr));
 #endif
       // Increment activity map pointers
       x->mb_activity_ptr++;
     }
 #if OUTPUT_NORM_ACT_STATS
     fprintf(f, "\n");
 #endif
   }
 #if OUTPUT_NORM_ACT_STATS
   fclose(f);
 #endif
 }
 #endif  // USE_ACT_INDEX
 // Loop through all MBs. Note activity of each, average activity and
 // calculate a normalized activity for each
 static void build_activity_map(VP9_COMP *cpi) {
   MACROBLOCK * const x = &cpi->mb;
   MACROBLOCKD *xd = &x->e_mbd;
   VP9_COMMON * const cm = &cpi->common;
 #if ALT_ACT_MEASURE
   YV12_BUFFER_CONFIG *new_yv12 = get_frame_new_buffer(cm);
   int recon_yoffset;
   int recon_y_stride = new_yv12->y_stride;
 #endif
   int mb_row, mb_col;
   unsigned int mb_activity;
   int64_t activity_sum = 0;
   x->mb_activity_ptr = cpi->mb_activity_map;
   // for each macroblock row in image
   for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
 #if ALT_ACT_MEASURE
     // reset above block coeffs
     xd->up_available = (mb_row != 0);
     recon_yoffset = (mb_row * recon_y_stride * 16);
 #endif
     // for each macroblock col in image
     for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
 #if ALT_ACT_MEASURE
       xd->plane[0].dst.buf = new_yv12->y_buffer + recon_yoffset;
       xd->left_available = (mb_col != 0);
       recon_yoffset += 16;
 #endif
       // measure activity
       mb_activity = mb_activity_measure(x, mb_row, mb_col);
       // Keep frame sum
       activity_sum += mb_activity;
       // Store MB level activity details.
       *x->mb_activity_ptr = mb_activity;
       // Increment activity map pointer
       x->mb_activity_ptr++;
       // adjust to the next column of source macroblocks
       x->plane[0].src.buf += 16;
     }
     // adjust to the next row of mbs
     x->plane[0].src.buf += 16 * x->plane[0].src.stride - 16 * cm->mb_cols;
   }
   // Calculate an "average" MB activity
   calc_av_activity(cpi, activity_sum);
 #if USE_ACT_INDEX
   // Calculate an activity index number of each mb
   calc_activity_index(cpi, x);
 #endif
 }
 // Macroblock activity masking
 void vp9_activity_masking(VP9_COMP *cpi, MACROBLOCK *x) {
 #if USE_ACT_INDEX
   x->rdmult += *(x->mb_activity_ptr) * (x->rdmult >> 2);
   x->errorperbit = x->rdmult * 100 / (110 * x->rddiv);
   x->errorperbit += (x->errorperbit == 0);
 #else
   int64_t a;
   int64_t b;
   int64_t act = *(x->mb_activity_ptr);
   // Apply the masking to the RD multiplier.
   a = act + (2 * cpi->activity_avg);
   b = (2 * act) + cpi->activity_avg;
   x->rdmult = (unsigned int) (((int64_t) x->rdmult * b + (a >> 1)) / a);
   x->errorperbit = x->rdmult * 100 / (110 * x->rddiv);
   x->errorperbit += (x->errorperbit == 0);
 #endif
   // Activity based Zbin adjustment
   adjust_act_zbin(cpi, x);
 }
 static void update_state(VP9_COMP *cpi, PICK_MODE_CONTEXT *ctx,
                          BLOCK_SIZE bsize, int output_enabled) {
   int i, x_idx, y;
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   MACROBLOCKD *const xd = &x->e_mbd;
   struct macroblock_plane *const p = x->plane;
   struct macroblockd_plane *const pd = xd->plane;
   MODE_INFO *mi = &ctx->mic;
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   MODE_INFO *mi_addr = xd->mi_8x8[0];
   int mb_mode_index = ctx->best_mode_index;
   const int mis = cm->mode_info_stride;
   const int mi_width = num_8x8_blocks_wide_lookup[bsize];
   const int mi_height = num_8x8_blocks_high_lookup[bsize];
   int max_plane;
   assert(mi->mbmi.mode < MB_MODE_COUNT);
   assert(mi->mbmi.ref_frame[0] < MAX_REF_FRAMES);
   assert(mi->mbmi.ref_frame[1] < MAX_REF_FRAMES);
   assert(mi->mbmi.sb_type == bsize);
   *mi_addr = *mi;
   max_plane = is_inter_block(mbmi) ? MAX_MB_PLANE : 1;
   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];
   }
   for (i = max_plane; 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];
   }
   // Restore the coding context of the MB to that that was in place
   // when the mode was picked for it
   for (y = 0; y < mi_height; y++)
     for (x_idx = 0; x_idx < mi_width; x_idx++)
       if ((xd->mb_to_right_edge >> (3 + MI_SIZE_LOG2)) + mi_width > x_idx
           && (xd->mb_to_bottom_edge >> (3 + MI_SIZE_LOG2)) + mi_height > y)
         xd->mi_8x8[x_idx + y * mis] = mi_addr;
   if (cpi->oxcf.aq_mode == VARIANCE_AQ) {
     vp9_mb_init_quantizer(cpi, x);
   }
   // FIXME(rbultje) I'm pretty sure this should go to the end of this block
   // (i.e. after the output_enabled)
   if (bsize < BLOCK_32X32) {
     if (bsize < BLOCK_16X16)
       ctx->tx_rd_diff[ALLOW_16X16] = ctx->tx_rd_diff[ALLOW_8X8];
     ctx->tx_rd_diff[ALLOW_32X32] = ctx->tx_rd_diff[ALLOW_16X16];
   }
   if (is_inter_block(mbmi) && mbmi->sb_type < BLOCK_8X8) {
     mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
     mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
   }
   x->skip = ctx->skip;
   vpx_memcpy(x->zcoeff_blk[mbmi->tx_size], ctx->zcoeff_blk,
              sizeof(uint8_t) * ctx->num_4x4_blk);
   if (!output_enabled)
     return;
   if (!vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
     for (i = 0; i < TX_MODES; i++)
       cpi->rd_tx_select_diff[i] += ctx->tx_rd_diff[i];
   }
   if (frame_is_intra_only(cm)) {
 #if CONFIG_INTERNAL_STATS
     static const int kf_mode_index[] = {
       THR_DC /*DC_PRED*/,
       THR_V_PRED /*V_PRED*/,
       THR_H_PRED /*H_PRED*/,
       THR_D45_PRED /*D45_PRED*/,
       THR_D135_PRED /*D135_PRED*/,
       THR_D117_PRED /*D117_PRED*/,
       THR_D153_PRED /*D153_PRED*/,
       THR_D207_PRED /*D207_PRED*/,
       THR_D63_PRED /*D63_PRED*/,
       THR_TM /*TM_PRED*/,
     };
     cpi->mode_chosen_counts[kf_mode_index[mi->mbmi.mode]]++;
 #endif
   } else {
     // Note how often each mode chosen as best
     cpi->mode_chosen_counts[mb_mode_index]++;
     if (is_inter_block(mbmi)
         && (mbmi->sb_type < BLOCK_8X8 || mbmi->mode == NEWMV)) {
       int_mv best_mv[2];
       const MV_REFERENCE_FRAME rf1 = mbmi->ref_frame[0];
       const MV_REFERENCE_FRAME rf2 = mbmi->ref_frame[1];
       best_mv[0].as_int = ctx->best_ref_mv.as_int;
       best_mv[1].as_int = ctx->second_best_ref_mv.as_int;
       if (mbmi->mode == NEWMV) {
         best_mv[0].as_int = mbmi->ref_mvs[rf1][0].as_int;
         if (rf2 > 0)
           best_mv[1].as_int = mbmi->ref_mvs[rf2][0].as_int;
       }
       mbmi->best_mv[0].as_int = best_mv[0].as_int;
       mbmi->best_mv[1].as_int = best_mv[1].as_int;
       vp9_update_mv_count(cpi, x, best_mv);
     }
     if (cm->mcomp_filter_type == SWITCHABLE && is_inter_mode(mbmi->mode)) {
       const int ctx = vp9_get_pred_context_switchable_interp(xd);
       ++cm->counts.switchable_interp[ctx][mbmi->interp_filter];
     }
     cpi->rd_comp_pred_diff[SINGLE_PREDICTION_ONLY] += ctx->single_pred_diff;
     cpi->rd_comp_pred_diff[COMP_PREDICTION_ONLY] += ctx->comp_pred_diff;
     cpi->rd_comp_pred_diff[HYBRID_PREDICTION] += ctx->hybrid_pred_diff;
     for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
       cpi->rd_filter_diff[i] += ctx->best_filter_diff[i];
   }
 }
 void vp9_setup_src_planes(MACROBLOCK *x, const YV12_BUFFER_CONFIG *src,
                           int mi_row, int mi_col) {
   uint8_t *const buffers[4] = {src->y_buffer, src->u_buffer, src->v_buffer,
                                src->alpha_buffer};
   const int strides[4] = {src->y_stride, src->uv_stride, src->uv_stride,
                           src->alpha_stride};
   int i;
   for (i = 0; i < MAX_MB_PLANE; i++)
     setup_pred_plane(&x->plane[i].src, buffers[i], strides[i], mi_row, mi_col,
                      NULL, x->e_mbd.plane[i].subsampling_x,
                      x->e_mbd.plane[i].subsampling_y);
 }
 static void set_offsets(VP9_COMP *cpi, const TileInfo *const tile,
                         int mi_row, int mi_col, BLOCK_SIZE bsize) {
   MACROBLOCK *const x = &cpi->mb;
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *mbmi;
   const int dst_fb_idx = cm->new_fb_idx;
   const int idx_str = xd->mode_info_stride * mi_row + mi_col;
   const int mi_width = num_8x8_blocks_wide_lookup[bsize];
   const int mi_height = num_8x8_blocks_high_lookup[bsize];
   const int mb_row = mi_row >> 1;
   const int mb_col = mi_col >> 1;
   const int idx_map = mb_row * cm->mb_cols + mb_col;
   const struct segmentation *const seg = &cm->seg;
   set_skip_context(xd, cpi->above_context, cpi->left_context, mi_row, mi_col);
   // Activity map pointer
   x->mb_activity_ptr = &cpi->mb_activity_map[idx_map];
   x->active_ptr = cpi->active_map + idx_map;
   xd->mi_8x8 = cm->mi_grid_visible + idx_str;
   xd->prev_mi_8x8 = cm->prev_mi_grid_visible + idx_str;
   // Special case: if prev_mi is NULL, the previous mode info context
   // cannot be used.
   xd->last_mi = cm->prev_mi ? xd->prev_mi_8x8[0] : NULL;
   xd->mi_8x8[0] = cm->mi + idx_str;
   mbmi = &xd->mi_8x8[0]->mbmi;
   // Set up destination pointers
   setup_dst_planes(xd, &cm->yv12_fb[dst_fb_idx], mi_row, mi_col);
   // Set up limit values for MV components
   // mv beyond the range do not produce new/different prediction block
   x->mv_row_min = -(((mi_row + mi_height) * MI_SIZE) + VP9_INTERP_EXTEND);
   x->mv_col_min = -(((mi_col + mi_width) * MI_SIZE) + VP9_INTERP_EXTEND);
   x->mv_row_max = (cm->mi_rows - mi_row) * MI_SIZE + VP9_INTERP_EXTEND;
   x->mv_col_max = (cm->mi_cols - mi_col) * MI_SIZE + VP9_INTERP_EXTEND;
   // Set up distance of MB to edge of frame in 1/8th pel units
   assert(!(mi_col & (mi_width - 1)) && !(mi_row & (mi_height - 1)));
   set_mi_row_col(xd, tile, mi_row, mi_height, mi_col, mi_width,
                  cm->mi_rows, cm->mi_cols);
   /* set up source buffers */
   vp9_setup_src_planes(x, cpi->Source, mi_row, mi_col);
   /* R/D setup */
   x->rddiv = cpi->RDDIV;
   x->rdmult = cpi->RDMULT;
   /* segment ID */
   if (seg->enabled) {
     if (!cpi->oxcf.aq_mode == VARIANCE_AQ) {
       uint8_t *map = seg->update_map ? cpi->segmentation_map
           : cm->last_frame_seg_map;
       mbmi->segment_id = vp9_get_segment_id(cm, map, bsize, mi_row, mi_col);
     }
     vp9_mb_init_quantizer(cpi, x);
     if (seg->enabled && cpi->seg0_cnt > 0
         && !vp9_segfeature_active(seg, 0, SEG_LVL_REF_FRAME)
         && vp9_segfeature_active(seg, 1, SEG_LVL_REF_FRAME)) {
       cpi->seg0_progress = (cpi->seg0_idx << 16) / cpi->seg0_cnt;
     } else {
       const int y = mb_row & ~3;
       const int x = mb_col & ~3;
       const int p16 = ((mb_row & 1) << 1) + (mb_col & 1);
       const int p32 = ((mb_row & 2) << 2) + ((mb_col & 2) << 1);
       const int tile_progress = tile->mi_col_start * cm->mb_rows >> 1;
       const int mb_cols = (tile->mi_col_end - tile->mi_col_start) >> 1;
       cpi->seg0_progress = ((y * mb_cols + x * 4 + p32 + p16 + tile_progress)
           << 16) / cm->MBs;
     }
     x->encode_breakout = cpi->segment_encode_breakout[mbmi->segment_id];
   } else {
     mbmi->segment_id = 0;
     x->encode_breakout = cpi->oxcf.encode_breakout;
   }
 }
 static void pick_sb_modes(VP9_COMP *cpi, const TileInfo *const tile,
                           int mi_row, int mi_col,
                           int *totalrate, int64_t *totaldist,
                           BLOCK_SIZE bsize, PICK_MODE_CONTEXT *ctx,
                           int64_t best_rd) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   MACROBLOCKD *const xd = &x->e_mbd;
   struct macroblock_plane *const p = x->plane;
   struct macroblockd_plane *const pd = xd->plane;
   int i;
   int orig_rdmult = x->rdmult;
   double rdmult_ratio;
   vp9_clear_system_state();  // __asm emms;
   rdmult_ratio = 1.0;  // avoid uninitialized warnings
   // Use the lower precision, but faster, 32x32 fdct for mode selection.
   x->use_lp32x32fdct = 1;
   if (bsize < BLOCK_8X8) {
     // When ab_index = 0 all sub-blocks are handled, so for ab_index != 0
     // there is nothing to be done.
     if (x->ab_index != 0) {
       *totalrate = 0;
       *totaldist = 0;
       return;
     }
   }
   set_offsets(cpi, tile, mi_row, mi_col, bsize);
   xd->mi_8x8[0]->mbmi.sb_type = bsize;
   for (i = 0; i < MAX_MB_PLANE; ++i) {
     p[i].coeff = ctx->coeff_pbuf[i][0];
     pd[i].qcoeff = ctx->qcoeff_pbuf[i][0];
     pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][0];
     pd[i].eobs = ctx->eobs_pbuf[i][0];
   }
   ctx->is_coded = 0;
   x->skip_recode = 0;
   // Set to zero to make sure we do not use the previous encoded frame stats
   xd->mi_8x8[0]->mbmi.skip_coeff = 0;
   x->source_variance = get_sby_perpixel_variance(cpi, x, bsize);
   if (cpi->oxcf.aq_mode == VARIANCE_AQ) {
     int energy;
     if (bsize <= BLOCK_16X16) {
       energy = x->mb_energy;
     } else {
       energy = vp9_block_energy(cpi, x, bsize);
     }
     xd->mi_8x8[0]->mbmi.segment_id = vp9_vaq_segment_id(energy);
     rdmult_ratio = vp9_vaq_rdmult_ratio(energy);
     vp9_mb_init_quantizer(cpi, x);
   }
   if (cpi->oxcf.tuning == VP8_TUNE_SSIM)
     vp9_activity_masking(cpi, x);
   if (cpi->oxcf.aq_mode == VARIANCE_AQ) {
     vp9_clear_system_state();  // __asm emms;
     x->rdmult = round(x->rdmult * rdmult_ratio);
   }
   // Find best coding mode & reconstruct the MB so it is available
   // as a predictor for MBs that follow in the SB
   if (frame_is_intra_only(cm)) {
     vp9_rd_pick_intra_mode_sb(cpi, x, totalrate, totaldist, bsize, ctx,
                               best_rd);
   } else {
     if (bsize >= BLOCK_8X8)
       vp9_rd_pick_inter_mode_sb(cpi, x, tile, mi_row, mi_col,
                                 totalrate, totaldist, bsize, ctx, best_rd);
     else
       vp9_rd_pick_inter_mode_sub8x8(cpi, x, tile, mi_row, mi_col, totalrate,
                                     totaldist, bsize, ctx, best_rd);
   }
   if (cpi->oxcf.aq_mode == VARIANCE_AQ) {
     x->rdmult = orig_rdmult;
     if (*totalrate != INT_MAX) {
       vp9_clear_system_state();  // __asm emms;
       *totalrate = round(*totalrate * rdmult_ratio);
     }
   }
 }
 static void update_stats(VP9_COMP *cpi) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   MACROBLOCKD *const xd = &x->e_mbd;
   MODE_INFO *mi = xd->mi_8x8[0];
   MB_MODE_INFO *const mbmi = &mi->mbmi;
   if (!frame_is_intra_only(cm)) {
     const int seg_ref_active = vp9_segfeature_active(&cm->seg, mbmi->segment_id,
                                                      SEG_LVL_REF_FRAME);
     if (!seg_ref_active)
       cpi->intra_inter_count[vp9_get_pred_context_intra_inter(xd)]
                             [is_inter_block(mbmi)]++;
     // If the segment reference feature is enabled we have only a single
     // reference frame allowed for the segment so exclude it from
     // the reference frame counts used to work out probabilities.
     if (is_inter_block(mbmi) && !seg_ref_active) {
       if (cm->comp_pred_mode == HYBRID_PREDICTION)
         cpi->comp_inter_count[vp9_get_pred_context_comp_inter_inter(cm, xd)]
                              [has_second_ref(mbmi)]++;
       if (has_second_ref(mbmi)) {
         cpi->comp_ref_count[vp9_get_pred_context_comp_ref_p(cm, xd)]
                            [mbmi->ref_frame[0] == GOLDEN_FRAME]++;
       } else {
         cpi->single_ref_count[vp9_get_pred_context_single_ref_p1(xd)][0]
                              [mbmi->ref_frame[0] != LAST_FRAME]++;
         if (mbmi->ref_frame[0] != LAST_FRAME)
           cpi->single_ref_count[vp9_get_pred_context_single_ref_p2(xd)][1]
                                [mbmi->ref_frame[0] != GOLDEN_FRAME]++;
       }
     }
   }
 }
 static BLOCK_SIZE *get_sb_partitioning(MACROBLOCK *x, BLOCK_SIZE bsize) {
   switch (bsize) {
     case BLOCK_64X64:
       return &x->sb64_partitioning;
     case BLOCK_32X32:
       return &x->sb_partitioning[x->sb_index];
     case BLOCK_16X16:
       return &x->mb_partitioning[x->sb_index][x->mb_index];
     case BLOCK_8X8:
       return &x->b_partitioning[x->sb_index][x->mb_index][x->b_index];
     default:
       assert(0);
       return NULL;
   }
 }
 static void restore_context(VP9_COMP *cpi, int mi_row, int mi_col,
                             ENTROPY_CONTEXT a[16 * MAX_MB_PLANE],
                             ENTROPY_CONTEXT l[16 * MAX_MB_PLANE],
                             PARTITION_CONTEXT sa[8], PARTITION_CONTEXT sl[8],
                             BLOCK_SIZE bsize) {
   MACROBLOCK *const x = &cpi->mb;
   MACROBLOCKD *const xd = &x->e_mbd;
   int p;
   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 mi_width = num_8x8_blocks_wide_lookup[bsize];
   int mi_height = num_8x8_blocks_high_lookup[bsize];
   for (p = 0; p < MAX_MB_PLANE; p++) {
     vpx_memcpy(
         cpi->above_context[p] + ((mi_col * 2) >> xd->plane[p].subsampling_x),
         a + num_4x4_blocks_wide * p,
         (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_wide) >>
         xd->plane[p].subsampling_x);
     vpx_memcpy(
         cpi->left_context[p]
             + ((mi_row & MI_MASK) * 2 >> xd->plane[p].subsampling_y),
         l + num_4x4_blocks_high * p,
         (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_high) >>
         xd->plane[p].subsampling_y);
   }
   vpx_memcpy(cpi->above_seg_context + mi_col, sa,
              sizeof(*cpi->above_seg_context) * mi_width);
   vpx_memcpy(cpi->left_seg_context + (mi_row & MI_MASK), sl,
              sizeof(cpi->left_seg_context[0]) * mi_height);
 }
 static void save_context(VP9_COMP *cpi, int mi_row, int mi_col,
                          ENTROPY_CONTEXT a[16 * MAX_MB_PLANE],
                          ENTROPY_CONTEXT l[16 * MAX_MB_PLANE],
                          PARTITION_CONTEXT sa[8], PARTITION_CONTEXT sl[8],
                          BLOCK_SIZE bsize) {
   const MACROBLOCK *const x = &cpi->mb;
   const MACROBLOCKD *const xd = &x->e_mbd;
   int p;
   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 mi_width = num_8x8_blocks_wide_lookup[bsize];
   int mi_height = num_8x8_blocks_high_lookup[bsize];
   // buffer the above/left context information of the block in search.
   for (p = 0; p < MAX_MB_PLANE; ++p) {
     vpx_memcpy(
         a + num_4x4_blocks_wide * p,
         cpi->above_context[p] + (mi_col * 2 >> xd->plane[p].subsampling_x),
         (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_wide) >>
         xd->plane[p].subsampling_x);
     vpx_memcpy(
         l + num_4x4_blocks_high * p,
         cpi->left_context[p]
             + ((mi_row & MI_MASK) * 2 >> xd->plane[p].subsampling_y),
         (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_high) >>
         xd->plane[p].subsampling_y);
   }
   vpx_memcpy(sa, cpi->above_seg_context + mi_col,
              sizeof(*cpi->above_seg_context) * mi_width);
   vpx_memcpy(sl, cpi->left_seg_context + (mi_row & MI_MASK),
              sizeof(cpi->left_seg_context[0]) * mi_height);
 }
 static void encode_b(VP9_COMP *cpi, const TileInfo *const tile,
                      TOKENEXTRA **tp, int mi_row, int mi_col,
                      int output_enabled, BLOCK_SIZE bsize, int sub_index) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
   if (sub_index != -1)
     *get_sb_index(x, bsize) = sub_index;
   if (bsize < BLOCK_8X8) {
     // When ab_index = 0 all sub-blocks are handled, so for ab_index != 0
     // there is nothing to be done.
     if (x->ab_index > 0)
       return;
   }
   set_offsets(cpi, tile, mi_row, mi_col, bsize);
   update_state(cpi, get_block_context(x, bsize), bsize, output_enabled);
   encode_superblock(cpi, tp, output_enabled, mi_row, mi_col, bsize);
   if (output_enabled) {
     update_stats(cpi);
     (*tp)->token = EOSB_TOKEN;
     (*tp)++;
   }
 }
 static void encode_sb(VP9_COMP *cpi, const TileInfo *const tile,
                       TOKENEXTRA **tp, int mi_row, int mi_col,
                       int output_enabled, BLOCK_SIZE bsize) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   BLOCK_SIZE c1 = BLOCK_8X8;
   const int bsl = b_width_log2(bsize), bs = (1 << bsl) / 4;
   int pl = 0;
   PARTITION_TYPE partition;
   BLOCK_SIZE subsize;
   int i;
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
   c1 = BLOCK_4X4;
   if (bsize >= BLOCK_8X8) {
     pl = partition_plane_context(cpi->above_seg_context, cpi->left_seg_context,
                                  mi_row, mi_col, bsize);
     c1 = *(get_sb_partitioning(x, bsize));
   }
   partition = partition_lookup[bsl][c1];
   switch (partition) {
     case PARTITION_NONE:
       if (output_enabled && bsize >= BLOCK_8X8)
         cpi->partition_count[pl][PARTITION_NONE]++;
       encode_b(cpi, tile, tp, mi_row, mi_col, output_enabled, c1, -1);
       break;
     case PARTITION_VERT:
       if (output_enabled)
         cpi->partition_count[pl][PARTITION_VERT]++;
       encode_b(cpi, tile, tp, mi_row, mi_col, output_enabled, c1, 0);
       encode_b(cpi, tile, tp, mi_row, mi_col + bs, output_enabled, c1, 1);
       break;
     case PARTITION_HORZ:
       if (output_enabled)
         cpi->partition_count[pl][PARTITION_HORZ]++;
       encode_b(cpi, tile, tp, mi_row, mi_col, output_enabled, c1, 0);
       encode_b(cpi, tile, tp, mi_row + bs, mi_col, output_enabled, c1, 1);
       break;
     case PARTITION_SPLIT:
       subsize = get_subsize(bsize, PARTITION_SPLIT);
       if (output_enabled)
         cpi->partition_count[pl][PARTITION_SPLIT]++;
       for (i = 0; i < 4; i++) {
         const int x_idx = i & 1, y_idx = i >> 1;
         *get_sb_index(x, subsize) = i;
         encode_sb(cpi, tile, tp, mi_row + y_idx * bs, mi_col + x_idx * bs,
                   output_enabled, subsize);
       }
       break;
     default:
       assert(0);
       break;
   }
   if (partition != PARTITION_SPLIT || bsize == BLOCK_8X8)
     update_partition_context(cpi->above_seg_context, cpi->left_seg_context,
                              mi_row, mi_col, c1, bsize);
 }
 // Check to see if the given partition size is allowed for a specified number
 // of 8x8 block rows and columns remaining in the image.
 // If not then return the largest allowed partition size
 static BLOCK_SIZE find_partition_size(BLOCK_SIZE bsize,
                                       int rows_left, int cols_left,
                                       int *bh, int *bw) {
   if ((rows_left <= 0) || (cols_left <= 0)) {
     return MIN(bsize, BLOCK_8X8);
   } else {
     for (; bsize > 0; --bsize) {
       *bh = num_8x8_blocks_high_lookup[bsize];
       *bw = num_8x8_blocks_wide_lookup[bsize];
       if ((*bh <= rows_left) && (*bw <= cols_left)) {
         break;
       }
     }
   }
   return bsize;
 }
 // This function attempts to set all mode info entries in a given SB64
 // to the same block partition size.
 // However, at the bottom and right borders of the image the requested size
 // may not be allowed in which case this code attempts to choose the largest
 // allowable partition.
 static void set_partitioning(VP9_COMP *cpi, const TileInfo *const tile,
                              MODE_INFO **mi_8x8, int mi_row, int mi_col) {
   VP9_COMMON *const cm = &cpi->common;
   BLOCK_SIZE bsize = cpi->sf.always_this_block_size;
   const int mis = cm->mode_info_stride;
   int row8x8_remaining = tile->mi_row_end - mi_row;
   int col8x8_remaining = tile->mi_col_end - mi_col;
   int block_row, block_col;
   MODE_INFO * mi_upper_left = cm->mi + mi_row * mis + mi_col;
   int bh = num_8x8_blocks_high_lookup[bsize];
   int bw = num_8x8_blocks_wide_lookup[bsize];
   assert((row8x8_remaining > 0) && (col8x8_remaining > 0));
   // Apply the requested partition size to the SB64 if it is all "in image"
   if ((col8x8_remaining >= MI_BLOCK_SIZE) &&
       (row8x8_remaining >= MI_BLOCK_SIZE)) {
     for (block_row = 0; block_row < MI_BLOCK_SIZE; block_row += bh) {
       for (block_col = 0; block_col < MI_BLOCK_SIZE; block_col += bw) {
         int index = block_row * mis + block_col;
         mi_8x8[index] = mi_upper_left + index;
         mi_8x8[index]->mbmi.sb_type = bsize;
       }
     }
   } else {
     // Else this is a partial SB64.
     for (block_row = 0; block_row < MI_BLOCK_SIZE; block_row += bh) {
       for (block_col = 0; block_col < MI_BLOCK_SIZE; block_col += bw) {
         int index = block_row * mis + block_col;
         // Find a partition size that fits
         bsize = find_partition_size(cpi->sf.always_this_block_size,
                                     (row8x8_remaining - block_row),
                                     (col8x8_remaining - block_col), &bh, &bw);
         mi_8x8[index] = mi_upper_left + index;
         mi_8x8[index]->mbmi.sb_type = bsize;
       }
     }
   }
 }
 static void copy_partitioning(VP9_COMP *cpi, MODE_INFO **mi_8x8,
                               MODE_INFO **prev_mi_8x8) {
   VP9_COMMON *const cm = &cpi->common;
   const int mis = cm->mode_info_stride;
   int block_row, block_col;
   for (block_row = 0; block_row < 8; ++block_row) {
     for (block_col = 0; block_col < 8; ++block_col) {
       MODE_INFO * prev_mi = prev_mi_8x8[block_row * mis + block_col];
       BLOCK_SIZE sb_type = prev_mi ? prev_mi->mbmi.sb_type : 0;
       ptrdiff_t offset;
       if (prev_mi) {
         offset = prev_mi - cm->prev_mi;
         mi_8x8[block_row * mis + block_col] = cm->mi + offset;
         mi_8x8[block_row * mis + block_col]->mbmi.sb_type = sb_type;
       }
     }
   }
 }
 static int sb_has_motion(VP9_COMP *cpi, MODE_INFO **prev_mi_8x8) {
   VP9_COMMON *const cm = &cpi->common;
   const int mis = cm->mode_info_stride;
   int block_row, block_col;
   if (cm->prev_mi) {
     for (block_row = 0; block_row < 8; ++block_row) {
       for (block_col = 0; block_col < 8; ++block_col) {
         MODE_INFO * prev_mi = prev_mi_8x8[block_row * mis + block_col];
         if (prev_mi) {
           if (abs(prev_mi->mbmi.mv[0].as_mv.row) >= 8 ||
               abs(prev_mi->mbmi.mv[0].as_mv.col) >= 8)
             return 1;
         }
       }
     }
   }
   return 0;
 }
 static void rd_use_partition(VP9_COMP *cpi,
                              const TileInfo *const tile,
                              MODE_INFO **mi_8x8,
                              TOKENEXTRA **tp, int mi_row, int mi_col,
                              BLOCK_SIZE bsize, int *rate, int64_t *dist,
                              int do_recon) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   const int mis = cm->mode_info_stride;
   int bsl = b_width_log2(bsize);
   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 ms = num_4x4_blocks_wide / 2;
   int mh = num_4x4_blocks_high / 2;
   int bss = (1 << bsl) / 4;
   int i, pl;
   PARTITION_TYPE partition = PARTITION_NONE;
   BLOCK_SIZE subsize;
   ENTROPY_CONTEXT l[16 * MAX_MB_PLANE], a[16 * MAX_MB_PLANE];
   PARTITION_CONTEXT sl[8], sa[8];
   int last_part_rate = INT_MAX;
   int64_t last_part_dist = INT_MAX;
   int split_rate = INT_MAX;
   int64_t split_dist = INT_MAX;
   int none_rate = INT_MAX;
   int64_t none_dist = INT_MAX;
   int chosen_rate = INT_MAX;
   int64_t chosen_dist = INT_MAX;
   BLOCK_SIZE sub_subsize = BLOCK_4X4;
   int splits_below = 0;
   BLOCK_SIZE bs_type = mi_8x8[0]->mbmi.sb_type;
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
   partition = partition_lookup[bsl][bs_type];
   subsize = get_subsize(bsize, partition);
   if (bsize < BLOCK_8X8) {
     // When ab_index = 0 all sub-blocks are handled, so for ab_index != 0
     // there is nothing to be done.
     if (x->ab_index != 0) {
       *rate = 0;
       *dist = 0;
       return;
     }
   } else {
     *(get_sb_partitioning(x, bsize)) = subsize;
   }
   save_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   if (bsize == BLOCK_16X16) {
     set_offsets(cpi, tile, mi_row, mi_col, bsize);
     x->mb_energy = vp9_block_energy(cpi, x, bsize);
   }
   x->fast_ms = 0;
   x->subblock_ref = 0;
   if (cpi->sf.adjust_partitioning_from_last_frame) {
     // Check if any of the sub blocks are further split.
     if (partition == PARTITION_SPLIT && subsize > BLOCK_8X8) {
       sub_subsize = get_subsize(subsize, PARTITION_SPLIT);
       splits_below = 1;
       for (i = 0; i < 4; i++) {
         int jj = i >> 1, ii = i & 0x01;
         MODE_INFO * this_mi = mi_8x8[jj * bss * mis + ii * bss];
         if (this_mi && this_mi->mbmi.sb_type >= sub_subsize) {
           splits_below = 0;
         }
       }
     }
     // If partition is not none try none unless each of the 4 splits are split
     // even further..
     if (partition != PARTITION_NONE && !splits_below &&
         mi_row + (ms >> 1) < cm->mi_rows &&
         mi_col + (ms >> 1) < cm->mi_cols) {
       *(get_sb_partitioning(x, bsize)) = bsize;
       pick_sb_modes(cpi, tile, mi_row, mi_col, &none_rate, &none_dist, bsize,
                     get_block_context(x, bsize), INT64_MAX);
       pl = partition_plane_context(cpi->above_seg_context,
                                    cpi->left_seg_context,
                                    mi_row, mi_col, bsize);
       none_rate += x->partition_cost[pl][PARTITION_NONE];
       restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
       mi_8x8[0]->mbmi.sb_type = bs_type;
       *(get_sb_partitioning(x, bsize)) = subsize;
     }
   }
   switch (partition) {
     case PARTITION_NONE:
       pick_sb_modes(cpi, tile, mi_row, mi_col, &last_part_rate, &last_part_dist,
                     bsize, get_block_context(x, bsize), INT64_MAX);
       break;
     case PARTITION_HORZ:
       *get_sb_index(x, subsize) = 0;
       pick_sb_modes(cpi, tile, mi_row, mi_col, &last_part_rate, &last_part_dist,
                     subsize, get_block_context(x, subsize), INT64_MAX);
       if (last_part_rate != INT_MAX &&
           bsize >= BLOCK_8X8 && mi_row + (mh >> 1) < cm->mi_rows) {
         int rt = 0;
         int64_t dt = 0;
         update_state(cpi, get_block_context(x, subsize), subsize, 0);
         encode_superblock(cpi, tp, 0, mi_row, mi_col, subsize);
         *get_sb_index(x, subsize) = 1;
         pick_sb_modes(cpi, tile, mi_row + (ms >> 1), mi_col, &rt, &dt, subsize,
                       get_block_context(x, subsize), INT64_MAX);
         if (rt == INT_MAX || dt == INT_MAX) {
           last_part_rate = INT_MAX;
           last_part_dist = INT_MAX;
           break;
         }
         last_part_rate += rt;
         last_part_dist += dt;
       }
       break;
     case PARTITION_VERT:
       *get_sb_index(x, subsize) = 0;
       pick_sb_modes(cpi, tile, mi_row, mi_col, &last_part_rate, &last_part_dist,
                     subsize, get_block_context(x, subsize), INT64_MAX);
       if (last_part_rate != INT_MAX &&
           bsize >= BLOCK_8X8 && mi_col + (ms >> 1) < cm->mi_cols) {
         int rt = 0;
         int64_t dt = 0;
         update_state(cpi, get_block_context(x, subsize), subsize, 0);
         encode_superblock(cpi, tp, 0, mi_row, mi_col, subsize);
         *get_sb_index(x, subsize) = 1;
         pick_sb_modes(cpi, tile, mi_row, mi_col + (ms >> 1), &rt, &dt, subsize,
                       get_block_context(x, subsize), INT64_MAX);
         if (rt == INT_MAX || dt == INT_MAX) {
           last_part_rate = INT_MAX;
           last_part_dist = INT_MAX;
           break;
         }
         last_part_rate += rt;
         last_part_dist += dt;
       }
       break;
     case PARTITION_SPLIT:
       // Split partition.
       last_part_rate = 0;
       last_part_dist = 0;
       for (i = 0; i < 4; i++) {
         int x_idx = (i & 1) * (ms >> 1);
         int y_idx = (i >> 1) * (ms >> 1);
         int jj = i >> 1, ii = i & 0x01;
         int rt;
         int64_t dt;
         if ((mi_row + y_idx >= cm->mi_rows) || (mi_col + x_idx >= cm->mi_cols))
           continue;
         *get_sb_index(x, subsize) = i;
         rd_use_partition(cpi, tile, mi_8x8 + jj * bss * mis + ii * bss, tp,
                          mi_row + y_idx, mi_col + x_idx, subsize, &rt, &dt,
                          i != 3);
         if (rt == INT_MAX || dt == INT_MAX) {
           last_part_rate = INT_MAX;
           last_part_dist = INT_MAX;
           break;
         }
         last_part_rate += rt;
         last_part_dist += dt;
       }
       break;
     default:
       assert(0);
   }
   pl = partition_plane_context(cpi->above_seg_context, cpi->left_seg_context,
                                mi_row, mi_col, bsize);
   if (last_part_rate < INT_MAX)
     last_part_rate += x->partition_cost[pl][partition];
   if (cpi->sf.adjust_partitioning_from_last_frame
       && partition != PARTITION_SPLIT && bsize > BLOCK_8X8
       && (mi_row + ms < cm->mi_rows || mi_row + (ms >> 1) == cm->mi_rows)
       && (mi_col + ms < cm->mi_cols || mi_col + (ms >> 1) == cm->mi_cols)) {
     BLOCK_SIZE split_subsize = get_subsize(bsize, PARTITION_SPLIT);
     split_rate = 0;
     split_dist = 0;
     restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
     // Split partition.
     for (i = 0; i < 4; i++) {
       int x_idx = (i & 1) * (num_4x4_blocks_wide >> 2);
       int y_idx = (i >> 1) * (num_4x4_blocks_wide >> 2);
       int rt = 0;
       int64_t dt = 0;
       ENTROPY_CONTEXT l[16 * MAX_MB_PLANE], a[16 * MAX_MB_PLANE];
       PARTITION_CONTEXT sl[8], sa[8];
       if ((mi_row + y_idx >= cm->mi_rows) || (mi_col + x_idx >= cm->mi_cols))
         continue;
       *get_sb_index(x, split_subsize) = i;
       *get_sb_partitioning(x, bsize) = split_subsize;
       *get_sb_partitioning(x, split_subsize) = split_subsize;
       save_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
       pick_sb_modes(cpi, tile, mi_row + y_idx, mi_col + x_idx, &rt, &dt,
                     split_subsize, get_block_context(x, split_subsize),
                     INT64_MAX);
       restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
       if (rt == INT_MAX || dt == INT_MAX) {
         split_rate = INT_MAX;
         split_dist = INT_MAX;
         break;
       }
       if (i != 3)
         encode_sb(cpi, tile, tp,  mi_row + y_idx, mi_col + x_idx, 0,
                   split_subsize);
       split_rate += rt;
       split_dist += dt;
       pl = partition_plane_context(cpi->above_seg_context,
                                    cpi->left_seg_context,
                                    mi_row + y_idx, mi_col + x_idx, bsize);
       split_rate += x->partition_cost[pl][PARTITION_NONE];
     }
     pl = partition_plane_context(cpi->above_seg_context, cpi->left_seg_context,
                                  mi_row, mi_col, bsize);
     if (split_rate < INT_MAX) {
       split_rate += x->partition_cost[pl][PARTITION_SPLIT];
       chosen_rate = split_rate;
       chosen_dist = split_dist;
     }
   }
   // If last_part is better set the partitioning to that...
   if (RDCOST(x->rdmult, x->rddiv, last_part_rate, last_part_dist)
       < RDCOST(x->rdmult, x->rddiv, chosen_rate, chosen_dist)) {
     mi_8x8[0]->mbmi.sb_type = bsize;
     if (bsize >= BLOCK_8X8)
       *(get_sb_partitioning(x, bsize)) = subsize;
     chosen_rate = last_part_rate;
     chosen_dist = last_part_dist;
   }
   // If none was better set the partitioning to that...
   if (RDCOST(x->rdmult, x->rddiv, chosen_rate, chosen_dist)
       > RDCOST(x->rdmult, x->rddiv, none_rate, none_dist)) {
     if (bsize >= BLOCK_8X8)
       *(get_sb_partitioning(x, bsize)) = bsize;
     chosen_rate = none_rate;
     chosen_dist = none_dist;
   }
   restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   // We must have chosen a partitioning and encoding or we'll fail later on.
   // No other opportunities for success.
   if ( bsize == BLOCK_64X64)
     assert(chosen_rate < INT_MAX && chosen_dist < INT_MAX);
   if (do_recon)
     encode_sb(cpi, tile, tp, mi_row, mi_col, bsize == BLOCK_64X64, bsize);
   *rate = chosen_rate;
   *dist = chosen_dist;
 }
 static const BLOCK_SIZE min_partition_size[BLOCK_SIZES] = {
   BLOCK_4X4, BLOCK_4X4, BLOCK_4X4, BLOCK_4X4,
   BLOCK_4X4, BLOCK_4X4, BLOCK_8X8, BLOCK_8X8,
   BLOCK_8X8, BLOCK_16X16, BLOCK_16X16, BLOCK_16X16, BLOCK_16X16
 };
 static const BLOCK_SIZE max_partition_size[BLOCK_SIZES] = {
   BLOCK_8X8, BLOCK_16X16, BLOCK_16X16, BLOCK_16X16,
   BLOCK_32X32, BLOCK_32X32, BLOCK_32X32, BLOCK_64X64,
   BLOCK_64X64, BLOCK_64X64, BLOCK_64X64, BLOCK_64X64, BLOCK_64X64
 };
 // Look at all the mode_info entries for blocks that are part of this
 // partition and find the min and max values for sb_type.
 // At the moment this is designed to work on a 64x64 SB but could be
 // adjusted to use a size parameter.
 //
 // The min and max are assumed to have been initialized prior to calling this
 // function so repeat calls can accumulate a min and max of more than one sb64.
 static void get_sb_partition_size_range(VP9_COMP *cpi, MODE_INFO ** mi_8x8,
                                         BLOCK_SIZE * min_block_size,
                                         BLOCK_SIZE * max_block_size ) {
   MACROBLOCKD *const xd = &cpi->mb.e_mbd;
   int sb_width_in_blocks = MI_BLOCK_SIZE;
   int sb_height_in_blocks  = MI_BLOCK_SIZE;
   int i, j;
   int index = 0;
   // Check the sb_type for each block that belongs to this region.
   for (i = 0; i < sb_height_in_blocks; ++i) {
     for (j = 0; j < sb_width_in_blocks; ++j) {
       MODE_INFO * mi = mi_8x8[index+j];
       BLOCK_SIZE sb_type = mi ? mi->mbmi.sb_type : 0;
       *min_block_size = MIN(*min_block_size, sb_type);
       *max_block_size = MAX(*max_block_size, sb_type);
     }
     index += xd->mode_info_stride;
   }
 }
 // Look at neighboring blocks and set a min and max partition size based on
 // what they chose.
 static void rd_auto_partition_range(VP9_COMP *cpi, const TileInfo *const tile,
                                     int row, int col,
                                     BLOCK_SIZE *min_block_size,
                                     BLOCK_SIZE *max_block_size) {
   VP9_COMMON * const cm = &cpi->common;
   MACROBLOCKD *const xd = &cpi->mb.e_mbd;
   MODE_INFO ** mi_8x8 = xd->mi_8x8;
   MODE_INFO ** prev_mi_8x8 = xd->prev_mi_8x8;
   const int left_in_image = xd->left_available && mi_8x8[-1];
   const int above_in_image = xd->up_available &&
                              mi_8x8[-xd->mode_info_stride];
   MODE_INFO ** above_sb64_mi_8x8;
   MODE_INFO ** left_sb64_mi_8x8;
   int row8x8_remaining = tile->mi_row_end - row;
   int col8x8_remaining = tile->mi_col_end - col;
   int bh, bw;
   // Trap case where we do not have a prediction.
   if (!left_in_image && !above_in_image &&
       ((cm->frame_type == KEY_FRAME) || !cm->prev_mi)) {
     *min_block_size = BLOCK_4X4;
     *max_block_size = BLOCK_64X64;
   } else {
     // Default "min to max" and "max to min"
     *min_block_size = BLOCK_64X64;
     *max_block_size = BLOCK_4X4;
     // NOTE: each call to get_sb_partition_size_range() uses the previous
     // passed in values for min and max as a starting point.
     //
     // Find the min and max partition used in previous frame at this location
     if (cm->prev_mi && (cm->frame_type != KEY_FRAME)) {
       get_sb_partition_size_range(cpi, prev_mi_8x8,
                                   min_block_size, max_block_size);
     }
     // Find the min and max partition sizes used in the left SB64
     if (left_in_image) {
       left_sb64_mi_8x8 = &mi_8x8[-MI_BLOCK_SIZE];
       get_sb_partition_size_range(cpi, left_sb64_mi_8x8,
                                   min_block_size, max_block_size);
     }
     // Find the min and max partition sizes used in the above SB64.
     if (above_in_image) {
       above_sb64_mi_8x8 = &mi_8x8[-xd->mode_info_stride * MI_BLOCK_SIZE];
       get_sb_partition_size_range(cpi, above_sb64_mi_8x8,
                                   min_block_size, max_block_size);
     }
   }
   // Give a bit of leaway either side of the observed min and max
   *min_block_size = min_partition_size[*min_block_size];
   *max_block_size = max_partition_size[*max_block_size];
   // Check border cases where max and min from neighbours may not be legal.
   *max_block_size = find_partition_size(*max_block_size,
                                         row8x8_remaining, col8x8_remaining,
                                         &bh, &bw);
   *min_block_size = MIN(*min_block_size, *max_block_size);
 }
 static void compute_fast_motion_search_level(VP9_COMP *cpi, BLOCK_SIZE bsize) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   // Only use 8x8 result for non HD videos.
   // int use_8x8 = (MIN(cpi->common.width, cpi->common.height) < 720) ? 1 : 0;
   int use_8x8 = 1;
   if (cm->frame_type && !cpi->is_src_frame_alt_ref &&
       ((use_8x8 && bsize == BLOCK_16X16) ||
       bsize == BLOCK_32X32 || bsize == BLOCK_64X64)) {
     int ref0 = 0, ref1 = 0, ref2 = 0, ref3 = 0;
     PICK_MODE_CONTEXT *block_context = NULL;
     if (bsize == BLOCK_16X16) {
       block_context = x->sb8x8_context[x->sb_index][x->mb_index];
     } else if (bsize == BLOCK_32X32) {
       block_context = x->mb_context[x->sb_index];
     } else if (bsize == BLOCK_64X64) {
       block_context = x->sb32_context;
     }
     if (block_context) {
       ref0 = block_context[0].mic.mbmi.ref_frame[0];
       ref1 = block_context[1].mic.mbmi.ref_frame[0];
       ref2 = block_context[2].mic.mbmi.ref_frame[0];
       ref3 = block_context[3].mic.mbmi.ref_frame[0];
     }
     // Currently, only consider 4 inter reference frames.
     if (ref0 && ref1 && ref2 && ref3) {
       int d01, d23, d02, d13;
       // Motion vectors for the four subblocks.
       int16_t mvr0 = block_context[0].mic.mbmi.mv[0].as_mv.row;
       int16_t mvc0 = block_context[0].mic.mbmi.mv[0].as_mv.col;
       int16_t mvr1 = block_context[1].mic.mbmi.mv[0].as_mv.row;
       int16_t mvc1 = block_context[1].mic.mbmi.mv[0].as_mv.col;
       int16_t mvr2 = block_context[2].mic.mbmi.mv[0].as_mv.row;
       int16_t mvc2 = block_context[2].mic.mbmi.mv[0].as_mv.col;
       int16_t mvr3 = block_context[3].mic.mbmi.mv[0].as_mv.row;
       int16_t mvc3 = block_context[3].mic.mbmi.mv[0].as_mv.col;
       // Adjust sign if ref is alt_ref.
       if (cm->ref_frame_sign_bias[ref0]) {
         mvr0 *= -1;
         mvc0 *= -1;
       }
       if (cm->ref_frame_sign_bias[ref1]) {
         mvr1 *= -1;
         mvc1 *= -1;
       }
       if (cm->ref_frame_sign_bias[ref2]) {
         mvr2 *= -1;
         mvc2 *= -1;
       }
       if (cm->ref_frame_sign_bias[ref3]) {
         mvr3 *= -1;
         mvc3 *= -1;
       }
       // Calculate mv distances.
       d01 = MAX(abs(mvr0 - mvr1), abs(mvc0 - mvc1));
       d23 = MAX(abs(mvr2 - mvr3), abs(mvc2 - mvc3));
       d02 = MAX(abs(mvr0 - mvr2), abs(mvc0 - mvc2));
       d13 = MAX(abs(mvr1 - mvr3), abs(mvc1 - mvc3));
       if (d01 < FAST_MOTION_MV_THRESH && d23 < FAST_MOTION_MV_THRESH &&
           d02 < FAST_MOTION_MV_THRESH && d13 < FAST_MOTION_MV_THRESH) {
         // Set fast motion search level.
         x->fast_ms = 1;
         if (ref0 == ref1 && ref1 == ref2 && ref2 == ref3 &&
             d01 < 2 && d23 < 2 && d02 < 2 && d13 < 2) {
           // Set fast motion search level.
           x->fast_ms = 2;
           if (!d01 && !d23 && !d02 && !d13) {
             x->fast_ms = 3;
             x->subblock_ref = ref0;
           }
         }
       }
     }
   }
 }
 static INLINE void store_pred_mv(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx) {
   vpx_memcpy(ctx->pred_mv, x->pred_mv, sizeof(x->pred_mv));
 }
 static INLINE void load_pred_mv(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx) {
   vpx_memcpy(x->pred_mv, ctx->pred_mv, sizeof(x->pred_mv));
 }
 // TODO(jingning,jimbankoski,rbultje): properly skip partition types that are
 // unlikely to be selected depending on previous rate-distortion optimization
 // results, for encoding speed-up.
 static void rd_pick_partition(VP9_COMP *cpi, const TileInfo *const tile,
                               TOKENEXTRA **tp, int mi_row,
                               int mi_col, BLOCK_SIZE bsize, int *rate,
                               int64_t *dist, int do_recon, int64_t best_rd) {
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCK *const x = &cpi->mb;
   const int ms = num_8x8_blocks_wide_lookup[bsize] / 2;
   ENTROPY_CONTEXT l[16 * MAX_MB_PLANE], a[16 * MAX_MB_PLANE];
   PARTITION_CONTEXT sl[8], sa[8];
   TOKENEXTRA *tp_orig = *tp;
   int i, pl;
   BLOCK_SIZE subsize;
   int this_rate, sum_rate = 0, best_rate = INT_MAX;
   int64_t this_dist, sum_dist = 0, best_dist = INT64_MAX;
   int64_t sum_rd = 0;
   int do_split = bsize >= BLOCK_8X8;
   int do_rect = 1;
   // Override skipping rectangular partition operations for edge blocks
   const int force_horz_split = (mi_row + ms >= cm->mi_rows);
   const int force_vert_split = (mi_col + ms >= cm->mi_cols);
   int partition_none_allowed = !force_horz_split && !force_vert_split;
   int partition_horz_allowed = !force_vert_split && bsize >= BLOCK_8X8;
   int partition_vert_allowed = !force_horz_split && bsize >= BLOCK_8X8;
   int partition_split_done = 0;
   (void) *tp_orig;
   if (bsize < BLOCK_8X8) {
     // When ab_index = 0 all sub-blocks are handled, so for ab_index != 0
     // there is nothing to be done.
     if (x->ab_index != 0) {
       *rate = 0;
       *dist = 0;
       return;
     }
   }
   assert(num_8x8_blocks_wide_lookup[bsize] ==
              num_8x8_blocks_high_lookup[bsize]);
   if (bsize == BLOCK_16X16) {
     set_offsets(cpi, tile, mi_row, mi_col, bsize);
     x->mb_energy = vp9_block_energy(cpi, x, bsize);
   }
   // Determine partition types in search according to the speed features.
   // The threshold set here has to be of square block size.
   if (cpi->sf.auto_min_max_partition_size) {
     partition_none_allowed &= (bsize <= cpi->sf.max_partition_size &&
                                bsize >= cpi->sf.min_partition_size);
     partition_horz_allowed &= ((bsize <= cpi->sf.max_partition_size &&
                                 bsize >  cpi->sf.min_partition_size) ||
                                 force_horz_split);
     partition_vert_allowed &= ((bsize <= cpi->sf.max_partition_size &&
                                 bsize >  cpi->sf.min_partition_size) ||
                                 force_vert_split);
     do_split &= bsize > cpi->sf.min_partition_size;
   }
   if (cpi->sf.use_square_partition_only) {
     partition_horz_allowed &= force_horz_split;
     partition_vert_allowed &= force_vert_split;
   }
   save_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   if (cpi->sf.disable_split_var_thresh && partition_none_allowed) {
     unsigned int source_variancey;
     vp9_setup_src_planes(x, cpi->Source, mi_row, mi_col);
     source_variancey = get_sby_perpixel_variance(cpi, x, bsize);
     if (source_variancey < cpi->sf.disable_split_var_thresh) {
       do_split = 0;
       if (source_variancey < cpi->sf.disable_split_var_thresh / 2)
         do_rect = 0;
     }
   }
   // PARTITION_NONE
   if (partition_none_allowed) {
     pick_sb_modes(cpi, tile, mi_row, mi_col, &this_rate, &this_dist, bsize,
                   get_block_context(x, bsize), best_rd);
     if (this_rate != INT_MAX) {
       if (bsize >= BLOCK_8X8) {
         pl = partition_plane_context(cpi->above_seg_context,
                                      cpi->left_seg_context,
                                      mi_row, mi_col, bsize);
         this_rate += x->partition_cost[pl][PARTITION_NONE];
       }
       sum_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_dist);
       if (sum_rd < best_rd) {
         int64_t stop_thresh = 2048;
         best_rate = this_rate;
         best_dist = this_dist;
         best_rd = sum_rd;
         if (bsize >= BLOCK_8X8)
           *(get_sb_partitioning(x, bsize)) = bsize;
         // Adjust threshold according to partition size.
         stop_thresh >>= 8 - (b_width_log2_lookup[bsize] +
             b_height_log2_lookup[bsize]);
         // If obtained distortion is very small, choose current partition
         // and stop splitting.
         if (this_dist < stop_thresh) {
           do_split = 0;
           do_rect = 0;
         }
       }
     }
     restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   }
   // store estimated motion vector
   if (cpi->sf.adaptive_motion_search)
     store_pred_mv(x, get_block_context(x, bsize));
   // PARTITION_SPLIT
   sum_rd = 0;
   // TODO(jingning): use the motion vectors given by the above search as
   // the starting point of motion search in the following partition type check.
   if (do_split) {
     subsize = get_subsize(bsize, PARTITION_SPLIT);
     for (i = 0; i < 4 && sum_rd < best_rd; ++i) {
       const int x_idx = (i & 1) * ms;
       const int y_idx = (i >> 1) * ms;
       if (mi_row + y_idx >= cm->mi_rows || mi_col + x_idx >= cm->mi_cols)
         continue;
       *get_sb_index(x, subsize) = i;
       if (cpi->sf.adaptive_motion_search)
         load_pred_mv(x, get_block_context(x, bsize));
       rd_pick_partition(cpi, tile, tp, mi_row + y_idx, mi_col + x_idx, subsize,
                         &this_rate, &this_dist, i != 3, best_rd - sum_rd);
       if (this_rate == INT_MAX) {
         sum_rd = INT64_MAX;
       } else {
         sum_rate += this_rate;
         sum_dist += this_dist;
         sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
       }
     }
     if (sum_rd < best_rd && i == 4) {
       pl = partition_plane_context(cpi->above_seg_context,
                                    cpi->left_seg_context,
                                    mi_row, mi_col, bsize);
       sum_rate += x->partition_cost[pl][PARTITION_SPLIT];
       sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
       if (sum_rd < best_rd) {
         best_rate = sum_rate;
         best_dist = sum_dist;
         best_rd = sum_rd;
         *(get_sb_partitioning(x, bsize)) = subsize;
       }
     } else {
       // skip rectangular partition test when larger block size
       // gives better rd cost
       if (cpi->sf.less_rectangular_check)
         do_rect &= !partition_none_allowed;
     }
     partition_split_done = 1;
     restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   }
   x->fast_ms = 0;
   x->subblock_ref = 0;
   if (partition_split_done &&
       cpi->sf.using_small_partition_info) {
     compute_fast_motion_search_level(cpi, bsize);
   }
   // PARTITION_HORZ
   if (partition_horz_allowed && do_rect) {
     subsize = get_subsize(bsize, PARTITION_HORZ);
     *get_sb_index(x, subsize) = 0;
     if (cpi->sf.adaptive_motion_search)
       load_pred_mv(x, get_block_context(x, bsize));
     pick_sb_modes(cpi, tile, mi_row, mi_col, &sum_rate, &sum_dist, subsize,
                   get_block_context(x, subsize), best_rd);
     sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
     if (sum_rd < best_rd && mi_row + ms < cm->mi_rows) {
       update_state(cpi, get_block_context(x, subsize), subsize, 0);
       encode_superblock(cpi, tp, 0, mi_row, mi_col, subsize);
       *get_sb_index(x, subsize) = 1;
       if (cpi->sf.adaptive_motion_search)
         load_pred_mv(x, get_block_context(x, bsize));
       pick_sb_modes(cpi, tile, mi_row + ms, mi_col, &this_rate,
                     &this_dist, subsize, get_block_context(x, subsize),
                     best_rd - sum_rd);
       if (this_rate == INT_MAX) {
         sum_rd = INT64_MAX;
       } else {
         sum_rate += this_rate;
         sum_dist += this_dist;
         sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
       }
     }
     if (sum_rd < best_rd) {
       pl = partition_plane_context(cpi->above_seg_context,
                                    cpi->left_seg_context,
                                    mi_row, mi_col, bsize);
       sum_rate += x->partition_cost[pl][PARTITION_HORZ];
       sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
       if (sum_rd < best_rd) {
         best_rd = sum_rd;
         best_rate = sum_rate;
         best_dist = sum_dist;
         *(get_sb_partitioning(x, bsize)) = subsize;
       }
     }
     restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   }
   // PARTITION_VERT
   if (partition_vert_allowed && do_rect) {
     subsize = get_subsize(bsize, PARTITION_VERT);
     *get_sb_index(x, subsize) = 0;
     if (cpi->sf.adaptive_motion_search)
       load_pred_mv(x, get_block_context(x, bsize));
     pick_sb_modes(cpi, tile, mi_row, mi_col, &sum_rate, &sum_dist, subsize,
                   get_block_context(x, subsize), best_rd);
     sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
     if (sum_rd < best_rd && mi_col + ms < cm->mi_cols) {
       update_state(cpi, get_block_context(x, subsize), subsize, 0);
       encode_superblock(cpi, tp, 0, mi_row, mi_col, subsize);
       *get_sb_index(x, subsize) = 1;
       if (cpi->sf.adaptive_motion_search)
         load_pred_mv(x, get_block_context(x, bsize));
       pick_sb_modes(cpi, tile, mi_row, mi_col + ms, &this_rate,
                     &this_dist, subsize, get_block_context(x, subsize),
                     best_rd - sum_rd);
       if (this_rate == INT_MAX) {
         sum_rd = INT64_MAX;
       } else {
         sum_rate += this_rate;
         sum_dist += this_dist;
         sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
       }
     }
     if (sum_rd < best_rd) {
       pl = partition_plane_context(cpi->above_seg_context,
                                    cpi->left_seg_context,
                                    mi_row, mi_col, bsize);
       sum_rate += x->partition_cost[pl][PARTITION_VERT];
       sum_rd = RDCOST(x->rdmult, x->rddiv, sum_rate, sum_dist);
       if (sum_rd < best_rd) {
         best_rate = sum_rate;
         best_dist = sum_dist;
         best_rd = sum_rd;
         *(get_sb_partitioning(x, bsize)) = subsize;
       }
     }
     restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);
   }
   *rate = best_rate;
   *dist = best_dist;
   if (best_rate < INT_MAX && best_dist < INT64_MAX && do_recon)
     encode_sb(cpi, tile, tp, mi_row, mi_col, bsize == BLOCK_64X64, bsize);
   if (bsize == BLOCK_64X64) {
     assert(tp_orig < *tp);
     assert(best_rate < INT_MAX);
     assert(best_dist < INT_MAX);
   } else {
     assert(tp_orig == *tp);
   }
 }
 // Examines 64x64 block and chooses a best reference frame
 static void rd_pick_reference_frame(VP9_COMP *cpi, const TileInfo *const tile,
                                     int mi_row, int mi_col) {
   VP9_COMMON * const cm = &cpi->common;
   MACROBLOCK * const x = &cpi->mb;
   int bsl = b_width_log2(BLOCK_64X64), bs = 1 << bsl;
   int ms = bs / 2;
   ENTROPY_CONTEXT l[16 * MAX_MB_PLANE], a[16 * MAX_MB_PLANE];
   PARTITION_CONTEXT sl[8], sa[8];
   int pl;
   int r;
   int64_t d;
   save_context(cpi, mi_row, mi_col, a, l, sa, sl, BLOCK_64X64);
   // Default is non mask (all reference frames allowed.
   cpi->ref_frame_mask = 0;
   // Do RD search for 64x64.
   if ((mi_row + (ms >> 1) < cm->mi_rows) &&
       (mi_col + (ms >> 1) < cm->mi_cols)) {
     cpi->set_ref_frame_mask = 1;
     pick_sb_modes(cpi, tile, mi_row, mi_col, &r, &d, BLOCK_64X64,
                   get_block_context(x, BLOCK_64X64), INT64_MAX);
     pl = partition_plane_context(cpi->above_seg_context, cpi->left_seg_context,
                                  mi_row, mi_col, BLOCK_64X64);
     r += x->partition_cost[pl][PARTITION_NONE];
     *(get_sb_partitioning(x, BLOCK_64X64)) = BLOCK_64X64;
     cpi->set_ref_frame_mask = 0;
   }
   restore_context(cpi, mi_row, mi_col, a, l, sa, sl, BLOCK_64X64);
 }
 static void encode_sb_row(VP9_COMP *cpi, const TileInfo *const tile,
                           int mi_row, TOKENEXTRA **tp) {
   VP9_COMMON * const cm = &cpi->common;
   int mi_col;
   // Initialize the left context for the new SB row
   vpx_memset(&cpi->left_context, 0, sizeof(cpi->left_context));
   vpx_memset(cpi->left_seg_context, 0, sizeof(cpi->left_seg_context));
   // Code each SB in the row
   for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end;
        mi_col += MI_BLOCK_SIZE) {
     int dummy_rate;
     int64_t dummy_dist;
     vp9_zero(cpi->mb.pred_mv);
     if (cpi->sf.reference_masking)
       rd_pick_reference_frame(cpi, tile, mi_row, mi_col);
     if (cpi->sf.use_lastframe_partitioning ||
         cpi->sf.use_one_partition_size_always ) {
       const int idx_str = cm->mode_info_stride * mi_row + mi_col;
       MODE_INFO **mi_8x8 = cm->mi_grid_visible + idx_str;
       MODE_INFO **prev_mi_8x8 = cm->prev_mi_grid_visible + idx_str;
       cpi->mb.source_variance = UINT_MAX;
       if (cpi->sf.use_one_partition_size_always) {
         set_offsets(cpi, tile, mi_row, mi_col, BLOCK_64X64);
         set_partitioning(cpi, tile, mi_8x8, mi_row, mi_col);
         rd_use_partition(cpi, tile, mi_8x8, tp, mi_row, mi_col, BLOCK_64X64,
                          &dummy_rate, &dummy_dist, 1);
       } else {
         if ((cpi->common.current_video_frame
             % cpi->sf.last_partitioning_redo_frequency) == 0
             || cm->prev_mi == 0
             || cpi->common.show_frame == 0
             || cpi->common.frame_type == KEY_FRAME
             || cpi->is_src_frame_alt_ref
             || ((cpi->sf.use_lastframe_partitioning ==
                  LAST_FRAME_PARTITION_LOW_MOTION) &&
                  sb_has_motion(cpi, prev_mi_8x8))) {
           // If required set upper and lower partition size limits
           if (cpi->sf.auto_min_max_partition_size) {
             set_offsets(cpi, tile, mi_row, mi_col, BLOCK_64X64);
             rd_auto_partition_range(cpi, tile, mi_row, mi_col,
                                     &cpi->sf.min_partition_size,
                                     &cpi->sf.max_partition_size);
           }
           rd_pick_partition(cpi, tile, tp, mi_row, mi_col, BLOCK_64X64,
                             &dummy_rate, &dummy_dist, 1, INT64_MAX);
         } else {
           copy_partitioning(cpi, mi_8x8, prev_mi_8x8);
           rd_use_partition(cpi, tile, mi_8x8, tp, mi_row, mi_col, BLOCK_64X64,
                            &dummy_rate, &dummy_dist, 1);
         }
       }
     } else {
       // If required set upper and lower partition size limits
       if (cpi->sf.auto_min_max_partition_size) {
         set_offsets(cpi, tile, mi_row, mi_col, BLOCK_64X64);
         rd_auto_partition_range(cpi, tile, mi_row, mi_col,
                                 &cpi->sf.min_partition_size,
                                 &cpi->sf.max_partition_size);
       }
       rd_pick_partition(cpi, tile, tp, mi_row, mi_col, BLOCK_64X64,
                         &dummy_rate, &dummy_dist, 1, INT64_MAX);
     }
   }
 }
 static void init_encode_frame_mb_context(VP9_COMP *cpi) {
   MACROBLOCK *const x = &cpi->mb;
   VP9_COMMON *const cm = &cpi->common;
   MACROBLOCKD *const xd = &x->e_mbd;
   const int aligned_mi_cols = mi_cols_aligned_to_sb(cm->mi_cols);
   x->act_zbin_adj = 0;
   cpi->seg0_idx = 0;
   xd->mode_info_stride = cm->mode_info_stride;
   // reset intra mode contexts
   if (frame_is_intra_only(cm))
     vp9_init_mbmode_probs(cm);
   // Copy data over into macro block data structures.
   vp9_setup_src_planes(x, cpi->Source, 0, 0);
   // TODO(jkoleszar): are these initializations required?
   setup_pre_planes(xd, 0, &cm->yv12_fb[cm->ref_frame_map[cpi->lst_fb_idx]],
 , 0, NULL);
   setup_dst_planes(xd, get_frame_new_buffer(cm), 0, 0);
   setup_block_dptrs(&x->e_mbd, cm->subsampling_x, cm->subsampling_y);
   xd->mi_8x8[0]->mbmi.mode = DC_PRED;
   xd->mi_8x8[0]->mbmi.uv_mode = DC_PRED;
   vp9_zero(cpi->y_mode_count);
   vp9_zero(cpi->y_uv_mode_count);
   vp9_zero(cm->counts.inter_mode);
   vp9_zero(cpi->partition_count);
   vp9_zero(cpi->intra_inter_count);
   vp9_zero(cpi->comp_inter_count);
   vp9_zero(cpi->single_ref_count);
   vp9_zero(cpi->comp_ref_count);
   vp9_zero(cm->counts.tx);
   vp9_zero(cm->counts.mbskip);
   // Note: this memset assumes above_context[0], [1] and [2]
   // are allocated as part of the same buffer.
   vpx_memset(cpi->above_context[0], 0,
              sizeof(*cpi->above_context[0]) *
 * aligned_mi_cols * MAX_MB_PLANE);
   vpx_memset(cpi->above_seg_context, 0,
              sizeof(*cpi->above_seg_context) * aligned_mi_cols);
 }
 static void switch_lossless_mode(VP9_COMP *cpi, int lossless) {
   if (lossless) {
     // printf("Switching to lossless\n");
     cpi->mb.fwd_txm4x4 = vp9_fwht4x4;
     cpi->mb.e_mbd.itxm_add = vp9_iwht4x4_add;
     cpi->mb.optimize = 0;
     cpi->common.lf.filter_level = 0;
     cpi->zbin_mode_boost_enabled = 0;
     cpi->common.tx_mode = ONLY_4X4;
   } else {
     // printf("Not lossless\n");
     cpi->mb.fwd_txm4x4 = vp9_fdct4x4;
     cpi->mb.e_mbd.itxm_add = vp9_idct4x4_add;
   }
 }
 static void switch_tx_mode(VP9_COMP *cpi) {
   if (cpi->sf.tx_size_search_method == USE_LARGESTALL &&
       cpi->common.tx_mode >= ALLOW_32X32)
     cpi->common.tx_mode = ALLOW_32X32;
 }
 static void encode_frame_internal(VP9_COMP *cpi) {
   int mi_row;
   MACROBLOCK * const x = &cpi->mb;
   VP9_COMMON * const cm = &cpi->common;
   MACROBLOCKD * const xd = &x->e_mbd;
 //  fprintf(stderr, "encode_frame_internal frame %d (%d) type %d\n",
 //           cpi->common.current_video_frame, cpi->common.show_frame,
 //           cm->frame_type);
 // debug output
 #if DBG_PRNT_SEGMAP
   {
     FILE *statsfile;
     statsfile = fopen("segmap2.stt", "a");
     fprintf(statsfile, "\n");
     fclose(statsfile);
   }
 #endif
   vp9_zero(cm->counts.switchable_interp);
   vp9_zero(cpi->tx_stepdown_count);
   xd->mi_8x8 = cm->mi_grid_visible;
   // required for vp9_frame_init_quantizer
   xd->mi_8x8[0] = cm->mi;
   xd->last_mi = cm->prev_mi;
   vp9_zero(cpi->NMVcount);
   vp9_zero(cpi->coef_counts);
   vp9_zero(cm->counts.eob_branch);
   cpi->mb.e_mbd.lossless = cm->base_qindex == 0 && cm->y_dc_delta_q == 0
       && cm->uv_dc_delta_q == 0 && cm->uv_ac_delta_q == 0;
   switch_lossless_mode(cpi, cpi->mb.e_mbd.lossless);
   vp9_frame_init_quantizer(cpi);
   vp9_initialize_rd_consts(cpi);
   vp9_initialize_me_consts(cpi, cm->base_qindex);
   switch_tx_mode(cpi);
   if (cpi->oxcf.tuning == VP8_TUNE_SSIM) {
     // Initialize encode frame context.
     init_encode_frame_mb_context(cpi);
     // Build a frame level activity map
     build_activity_map(cpi);
   }
   // Re-initialize encode frame context.
   init_encode_frame_mb_context(cpi);
   vp9_zero(cpi->rd_comp_pred_diff);
   vp9_zero(cpi->rd_filter_diff);
   vp9_zero(cpi->rd_tx_select_diff);
   vp9_zero(cpi->rd_tx_select_threshes);
   set_prev_mi(cm);
   {
     struct vpx_usec_timer emr_timer;
     vpx_usec_timer_start(&emr_timer);
     {
       // Take tiles into account and give start/end MB
       int tile_col, tile_row;
       TOKENEXTRA *tp = cpi->tok;
       const int tile_cols = 1 << cm->log2_tile_cols;
       const int tile_rows = 1 << cm->log2_tile_rows;
       for (tile_row = 0; tile_row < tile_rows; tile_row++) {
         for (tile_col = 0; tile_col < tile_cols; tile_col++) {
           TileInfo tile;
           TOKENEXTRA *tp_old = tp;
           // For each row of SBs in the frame
           vp9_tile_init(&tile, cm, tile_row, tile_col);
           for (mi_row = tile.mi_row_start;
                mi_row < tile.mi_row_end; mi_row += 8)
             encode_sb_row(cpi, &tile, mi_row, &tp);
           cpi->tok_count[tile_row][tile_col] = (unsigned int)(tp - tp_old);
           assert(tp - cpi->tok <= get_token_alloc(cm->mb_rows, cm->mb_cols));
         }
       }
     }
     vpx_usec_timer_mark(&emr_timer);
     cpi->time_encode_sb_row += vpx_usec_timer_elapsed(&emr_timer);
   }
   if (cpi->sf.skip_encode_sb) {
     int j;
     unsigned int intra_count = 0, inter_count = 0;
     for (j = 0; j < INTRA_INTER_CONTEXTS; ++j) {
       intra_count += cpi->intra_inter_count[j][0];
       inter_count += cpi->intra_inter_count[j][1];
     }
     cpi->sf.skip_encode_frame = ((intra_count << 2) < inter_count);
     cpi->sf.skip_encode_frame &= (cm->frame_type != KEY_FRAME);
     cpi->sf.skip_encode_frame &= cm->show_frame;
   } else {
     cpi->sf.skip_encode_frame = 0;
   }
 #if 0
   // Keep record of the total distortion this time around for future use
   cpi->last_frame_distortion = cpi->frame_distortion;
 #endif
 }
 static int check_dual_ref_flags(VP9_COMP *cpi) {
   const int ref_flags = cpi->ref_frame_flags;
   if (vp9_segfeature_active(&cpi->common.seg, 1, SEG_LVL_REF_FRAME)) {
     return 0;
   } else {
     return (!!(ref_flags & VP9_GOLD_FLAG) + !!(ref_flags & VP9_LAST_FLAG)
         + !!(ref_flags & VP9_ALT_FLAG)) >= 2;
   }
 }
 static int get_skip_flag(MODE_INFO **mi_8x8, int mis, int ymbs, int xmbs) {
   int x, y;
   for (y = 0; y < ymbs; y++) {
     for (x = 0; x < xmbs; x++) {
       if (!mi_8x8[y * mis + x]->mbmi.skip_coeff)
         return 0;
     }
   }
   return 1;
 }
 static void set_txfm_flag(MODE_INFO **mi_8x8, int mis, int ymbs, int xmbs,
                           TX_SIZE tx_size) {
   int x, y;
   for (y = 0; y < ymbs; y++) {
     for (x = 0; x < xmbs; x++)
       mi_8x8[y * mis + x]->mbmi.tx_size = tx_size;
   }
 }
 static void reset_skip_txfm_size_b(VP9_COMP *cpi, MODE_INFO **mi_8x8,
                                    int mis, TX_SIZE max_tx_size, int bw, int bh,
                                    int mi_row, int mi_col, BLOCK_SIZE bsize) {
   VP9_COMMON * const cm = &cpi->common;
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) {
     return;
   } else {
     MB_MODE_INFO * const mbmi = &mi_8x8[0]->mbmi;
     if (mbmi->tx_size > max_tx_size) {
       const int ymbs = MIN(bh, cm->mi_rows - mi_row);
       const int xmbs = MIN(bw, cm->mi_cols - mi_col);
       assert(vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP) ||
              get_skip_flag(mi_8x8, mis, ymbs, xmbs));
       set_txfm_flag(mi_8x8, mis, ymbs, xmbs, max_tx_size);
     }
   }
 }
 static void reset_skip_txfm_size_sb(VP9_COMP *cpi, MODE_INFO **mi_8x8,
                                     TX_SIZE max_tx_size, int mi_row, int mi_col,
                                     BLOCK_SIZE bsize) {
   VP9_COMMON * const cm = &cpi->common;
   const int mis = cm->mode_info_stride;
   int bw, bh;
   const int bs = num_8x8_blocks_wide_lookup[bsize], hbs = bs / 2;
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
   bw = num_8x8_blocks_wide_lookup[mi_8x8[0]->mbmi.sb_type];
   bh = num_8x8_blocks_high_lookup[mi_8x8[0]->mbmi.sb_type];
   if (bw == bs && bh == bs) {
     reset_skip_txfm_size_b(cpi, mi_8x8, mis, max_tx_size, bs, bs, mi_row,
                            mi_col, bsize);
   } else if (bw == bs && bh < bs) {
     reset_skip_txfm_size_b(cpi, mi_8x8, mis, max_tx_size, bs, hbs, mi_row,
                            mi_col, bsize);
     reset_skip_txfm_size_b(cpi, mi_8x8 + hbs * mis, mis, max_tx_size, bs, hbs,
                            mi_row + hbs, mi_col, bsize);
   } else if (bw < bs && bh == bs) {
     reset_skip_txfm_size_b(cpi, mi_8x8, mis, max_tx_size, hbs, bs, mi_row,
                            mi_col, bsize);
     reset_skip_txfm_size_b(cpi, mi_8x8 + hbs, mis, max_tx_size, hbs, bs, mi_row,
                            mi_col + hbs, bsize);
   } else {
     const BLOCK_SIZE subsize = subsize_lookup[PARTITION_SPLIT][bsize];
     int n;
     assert(bw < bs && bh < bs);
     for (n = 0; n < 4; n++) {
       const int mi_dc = hbs * (n & 1);
       const int mi_dr = hbs * (n >> 1);
       reset_skip_txfm_size_sb(cpi, &mi_8x8[mi_dr * mis + mi_dc], max_tx_size,
                               mi_row + mi_dr, mi_col + mi_dc, subsize);
     }
   }
 }
 static void reset_skip_txfm_size(VP9_COMP *cpi, TX_SIZE txfm_max) {
   VP9_COMMON * const cm = &cpi->common;
   int mi_row, mi_col;
   const int mis = cm->mode_info_stride;
 //  MODE_INFO *mi, *mi_ptr = cm->mi;
   MODE_INFO **mi_8x8, **mi_ptr = cm->mi_grid_visible;
   for (mi_row = 0; mi_row < cm->mi_rows; mi_row += 8, mi_ptr += 8 * mis) {
     mi_8x8 = mi_ptr;
     for (mi_col = 0; mi_col < cm->mi_cols; mi_col += 8, mi_8x8 += 8) {
       reset_skip_txfm_size_sb(cpi, mi_8x8, txfm_max, mi_row, mi_col,
                               BLOCK_64X64);
     }
   }
 }
 static int get_frame_type(VP9_COMP *cpi) {
   int frame_type;
   if (frame_is_intra_only(&cpi->common))
     frame_type = 0;
   else if (cpi->is_src_frame_alt_ref && cpi->refresh_golden_frame)
     frame_type = 3;
   else if (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)
     frame_type = 1;
   else
     frame_type = 2;
   return frame_type;
 }
 static void select_tx_mode(VP9_COMP *cpi) {
   if (cpi->oxcf.lossless) {
     cpi->common.tx_mode = ONLY_4X4;
   } else if (cpi->common.current_video_frame == 0) {
     cpi->common.tx_mode = TX_MODE_SELECT;
   } else {
     if (cpi->sf.tx_size_search_method == USE_LARGESTALL) {
       cpi->common.tx_mode = ALLOW_32X32;
     } else if (cpi->sf.tx_size_search_method == USE_FULL_RD) {
       int frame_type = get_frame_type(cpi);
       cpi->common.tx_mode =
           cpi->rd_tx_select_threshes[frame_type][ALLOW_32X32]
           > cpi->rd_tx_select_threshes[frame_type][TX_MODE_SELECT] ?
           ALLOW_32X32 : TX_MODE_SELECT;
     } else {
       unsigned int total = 0;
       int i;
       for (i = 0; i < TX_SIZES; ++i)
         total += cpi->tx_stepdown_count[i];
       if (total) {
         double fraction = (double)cpi->tx_stepdown_count[0] / total;
         cpi->common.tx_mode = fraction > 0.90 ? ALLOW_32X32 : TX_MODE_SELECT;
         // printf("fraction = %f\n", fraction);
       }  // else keep unchanged
     }
   }
 }
 void vp9_encode_frame(VP9_COMP *cpi) {
   VP9_COMMON * const cm = &cpi->common;
   // In the longer term the encoder should be generalized to match the
   // decoder such that we allow compound where one of the 3 buffers has a
   // different sign bias and that buffer is then the fixed ref. However, this
   // requires further work in the rd loop. For now the only supported encoder
   // side behavior is where the ALT ref buffer has opposite sign bias to
   // the other two.
   if (!frame_is_intra_only(cm)) {
     if ((cm->ref_frame_sign_bias[ALTREF_FRAME]
          == cm->ref_frame_sign_bias[GOLDEN_FRAME])
         || (cm->ref_frame_sign_bias[ALTREF_FRAME]
             == cm->ref_frame_sign_bias[LAST_FRAME])) {
       cm->allow_comp_inter_inter = 0;
     } else {
       cm->allow_comp_inter_inter = 1;
       cm->comp_fixed_ref = ALTREF_FRAME;
       cm->comp_var_ref[0] = LAST_FRAME;
       cm->comp_var_ref[1] = GOLDEN_FRAME;
     }
   }
   if (cpi->sf.RD) {
     int i, pred_type;
     INTERPOLATION_TYPE filter_type;
     /*
      * This code does a single RD pass over the whole frame assuming
      * either compound, single or hybrid prediction as per whatever has
      * worked best for that type of frame in the past.
      * It also predicts whether another coding mode would have worked
      * better that this coding mode. If that is the case, it remembers
      * that for subsequent frames.
      * It does the same analysis for transform size selection also.
      */
     int frame_type = get_frame_type(cpi);
     /* prediction (compound, single or hybrid) mode selection */
     if (frame_type == 3 || !cm->allow_comp_inter_inter)
       pred_type = SINGLE_PREDICTION_ONLY;
     else if (cpi->rd_prediction_type_threshes[frame_type][1]
              > cpi->rd_prediction_type_threshes[frame_type][0]
              && cpi->rd_prediction_type_threshes[frame_type][1]
              > cpi->rd_prediction_type_threshes[frame_type][2]
              && check_dual_ref_flags(cpi) && cpi->static_mb_pct == 100)
       pred_type = COMP_PREDICTION_ONLY;
     else if (cpi->rd_prediction_type_threshes[frame_type][0]
              > cpi->rd_prediction_type_threshes[frame_type][2])
       pred_type = SINGLE_PREDICTION_ONLY;
     else
       pred_type = HYBRID_PREDICTION;
     /* filter type selection */
     // FIXME(rbultje) for some odd reason, we often select smooth_filter
     // as default filter for ARF overlay frames. This is a REALLY BAD
     // IDEA so we explicitly disable it here.
     if (frame_type != 3 &&
         cpi->rd_filter_threshes[frame_type][1] >
             cpi->rd_filter_threshes[frame_type][0] &&
         cpi->rd_filter_threshes[frame_type][1] >
             cpi->rd_filter_threshes[frame_type][2] &&
         cpi->rd_filter_threshes[frame_type][1] >
             cpi->rd_filter_threshes[frame_type][SWITCHABLE_FILTERS]) {
       filter_type = EIGHTTAP_SMOOTH;
     } else if (cpi->rd_filter_threshes[frame_type][2] >
             cpi->rd_filter_threshes[frame_type][0] &&
         cpi->rd_filter_threshes[frame_type][2] >
             cpi->rd_filter_threshes[frame_type][SWITCHABLE_FILTERS]) {
       filter_type = EIGHTTAP_SHARP;
     } else if (cpi->rd_filter_threshes[frame_type][0] >
                   cpi->rd_filter_threshes[frame_type][SWITCHABLE_FILTERS]) {
       filter_type = EIGHTTAP;
     } else {
       filter_type = SWITCHABLE;
     }
     cpi->mb.e_mbd.lossless = 0;
     if (cpi->oxcf.lossless) {
       cpi->mb.e_mbd.lossless = 1;
     }
     /* transform size selection (4x4, 8x8, 16x16 or select-per-mb) */
     select_tx_mode(cpi);
     cpi->common.comp_pred_mode = pred_type;
     cpi->common.mcomp_filter_type = filter_type;
     encode_frame_internal(cpi);
     for (i = 0; i < NB_PREDICTION_TYPES; ++i) {
       const int diff = (int) (cpi->rd_comp_pred_diff[i] / cpi->common.MBs);
       cpi->rd_prediction_type_threshes[frame_type][i] += diff;
       cpi->rd_prediction_type_threshes[frame_type][i] >>= 1;
     }
     for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++) {
       const int64_t diff = cpi->rd_filter_diff[i] / cpi->common.MBs;
       cpi->rd_filter_threshes[frame_type][i] =
           (cpi->rd_filter_threshes[frame_type][i] + diff) / 2;
     }
     for (i = 0; i < TX_MODES; ++i) {
       int64_t pd = cpi->rd_tx_select_diff[i];
       int diff;
       if (i == TX_MODE_SELECT)
         pd -= RDCOST(cpi->mb.rdmult, cpi->mb.rddiv,
 * (TX_SIZES - 1), 0);
       diff = (int) (pd / cpi->common.MBs);
       cpi->rd_tx_select_threshes[frame_type][i] += diff;
       cpi->rd_tx_select_threshes[frame_type][i] /= 2;
     }
     if (cpi->common.comp_pred_mode == HYBRID_PREDICTION) {
       int single_count_zero = 0;
       int comp_count_zero = 0;
       for (i = 0; i < COMP_INTER_CONTEXTS; i++) {
         single_count_zero += cpi->comp_inter_count[i][0];
         comp_count_zero += cpi->comp_inter_count[i][1];
       }
       if (comp_count_zero == 0) {
         cpi->common.comp_pred_mode = SINGLE_PREDICTION_ONLY;
         vp9_zero(cpi->comp_inter_count);
       } else if (single_count_zero == 0) {
         cpi->common.comp_pred_mode = COMP_PREDICTION_ONLY;
         vp9_zero(cpi->comp_inter_count);
       }
     }
     if (cpi->common.tx_mode == TX_MODE_SELECT) {
       int count4x4 = 0;
       int count8x8_lp = 0, count8x8_8x8p = 0;
       int count16x16_16x16p = 0, count16x16_lp = 0;
       int count32x32 = 0;
       for (i = 0; i < TX_SIZE_CONTEXTS; ++i) {
         count4x4 += cm->counts.tx.p32x32[i][TX_4X4];
         count4x4 += cm->counts.tx.p16x16[i][TX_4X4];
         count4x4 += cm->counts.tx.p8x8[i][TX_4X4];
         count8x8_lp += cm->counts.tx.p32x32[i][TX_8X8];
         count8x8_lp += cm->counts.tx.p16x16[i][TX_8X8];
         count8x8_8x8p += cm->counts.tx.p8x8[i][TX_8X8];
         count16x16_16x16p += cm->counts.tx.p16x16[i][TX_16X16];
         count16x16_lp += cm->counts.tx.p32x32[i][TX_16X16];
         count32x32 += cm->counts.tx.p32x32[i][TX_32X32];
       }
       if (count4x4 == 0 && count16x16_lp == 0 && count16x16_16x16p == 0
           && count32x32 == 0) {
         cpi->common.tx_mode = ALLOW_8X8;
         reset_skip_txfm_size(cpi, TX_8X8);
       } else if (count8x8_8x8p == 0 && count16x16_16x16p == 0
                  && count8x8_lp == 0 && count16x16_lp == 0 && count32x32 == 0) {
         cpi->common.tx_mode = ONLY_4X4;
         reset_skip_txfm_size(cpi, TX_4X4);
       } else if (count8x8_lp == 0 && count16x16_lp == 0 && count4x4 == 0) {
         cpi->common.tx_mode = ALLOW_32X32;
       } else if (count32x32 == 0 && count8x8_lp == 0 && count4x4 == 0) {
         cpi->common.tx_mode = ALLOW_16X16;
         reset_skip_txfm_size(cpi, TX_16X16);
       }
     }
   } else {
     encode_frame_internal(cpi);
   }
 }
 static void sum_intra_stats(VP9_COMP *cpi, const MODE_INFO *mi) {
   const MB_PREDICTION_MODE y_mode = mi->mbmi.mode;
   const MB_PREDICTION_MODE uv_mode = mi->mbmi.uv_mode;
   const BLOCK_SIZE bsize = mi->mbmi.sb_type;
   ++cpi->y_uv_mode_count[y_mode][uv_mode];
   if (bsize < BLOCK_8X8) {
     int idx, idy;
     const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[bsize];
     const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[bsize];
     for (idy = 0; idy < 2; idy += num_4x4_blocks_high)
       for (idx = 0; idx < 2; idx += num_4x4_blocks_wide)
         ++cpi->y_mode_count[0][mi->bmi[idy * 2 + idx].as_mode];
   } else {
     ++cpi->y_mode_count[size_group_lookup[bsize]][y_mode];
   }
 }
 // Experimental stub function to create a per MB zbin adjustment based on
 // some previously calculated measure of MB activity.
 static void adjust_act_zbin(VP9_COMP *cpi, MACROBLOCK *x) {
 #if USE_ACT_INDEX
   x->act_zbin_adj = *(x->mb_activity_ptr);
 #else
   int64_t a;
   int64_t b;
   int64_t act = *(x->mb_activity_ptr);
   // Apply the masking to the RD multiplier.
   a = act + 4 * cpi->activity_avg;
   b = 4 * act + cpi->activity_avg;
   if (act > cpi->activity_avg)
     x->act_zbin_adj = (int) (((int64_t) b + (a >> 1)) / a) - 1;
   else
     x->act_zbin_adj = 1 - (int) (((int64_t) a + (b >> 1)) / b);
 #endif
 }
 static void encode_superblock(VP9_COMP *cpi, TOKENEXTRA **t, int output_enabled,
                               int mi_row, int mi_col, BLOCK_SIZE bsize) {
   VP9_COMMON * const cm = &cpi->common;
   MACROBLOCK * const x = &cpi->mb;
   MACROBLOCKD * const xd = &x->e_mbd;
   MODE_INFO **mi_8x8 = xd->mi_8x8;
   MODE_INFO *mi = mi_8x8[0];
   MB_MODE_INFO *mbmi = &mi->mbmi;
   PICK_MODE_CONTEXT *ctx = get_block_context(x, bsize);
   unsigned int segment_id = mbmi->segment_id;
   const int mis = cm->mode_info_stride;
   const int mi_width = num_8x8_blocks_wide_lookup[bsize];
   const int mi_height = num_8x8_blocks_high_lookup[bsize];
   x->skip_recode = !x->select_txfm_size && mbmi->sb_type >= BLOCK_8X8;
   x->skip_optimize = ctx->is_coded;
   ctx->is_coded = 1;
   x->use_lp32x32fdct = cpi->sf.use_lp32x32fdct;
   x->skip_encode = (!output_enabled && cpi->sf.skip_encode_frame &&
                     x->q_index < QIDX_SKIP_THRESH);
   if (x->skip_encode)
     return;
   if (cm->frame_type == KEY_FRAME) {
     if (cpi->oxcf.tuning == VP8_TUNE_SSIM) {
       adjust_act_zbin(cpi, x);
       vp9_update_zbin_extra(cpi, x);
     }
   } else {
     vp9_setup_interp_filters(xd, mbmi->interp_filter, cm);
     if (cpi->oxcf.tuning == VP8_TUNE_SSIM) {
       // Adjust the zbin based on this MB rate.
       adjust_act_zbin(cpi, x);
     }
     // Experimental code. Special case for gf and arf zeromv modes.
     // Increase zbin size to suppress noise
     cpi->zbin_mode_boost = 0;
     if (cpi->zbin_mode_boost_enabled) {
       if (is_inter_block(mbmi)) {
         if (mbmi->mode == ZEROMV) {
           if (mbmi->ref_frame[0] != LAST_FRAME)
             cpi->zbin_mode_boost = GF_ZEROMV_ZBIN_BOOST;
           else
             cpi->zbin_mode_boost = LF_ZEROMV_ZBIN_BOOST;
         } else if (mbmi->sb_type < BLOCK_8X8) {
           cpi->zbin_mode_boost = SPLIT_MV_ZBIN_BOOST;
         } else {
           cpi->zbin_mode_boost = MV_ZBIN_BOOST;
         }
       } else {
         cpi->zbin_mode_boost = INTRA_ZBIN_BOOST;
       }
     }
     vp9_update_zbin_extra(cpi, x);
   }
   if (!is_inter_block(mbmi)) {
     vp9_encode_intra_block_y(x, MAX(bsize, BLOCK_8X8));
     vp9_encode_intra_block_uv(x, MAX(bsize, BLOCK_8X8));
     if (output_enabled)
       sum_intra_stats(cpi, mi);
   } else {
     int idx = cm->ref_frame_map[get_ref_frame_idx(cpi, mbmi->ref_frame[0])];
     YV12_BUFFER_CONFIG *ref_fb = &cm->yv12_fb[idx];
     YV12_BUFFER_CONFIG *second_ref_fb = NULL;
     if (has_second_ref(mbmi)) {
       idx = cm->ref_frame_map[get_ref_frame_idx(cpi, mbmi->ref_frame[1])];
       second_ref_fb = &cm->yv12_fb[idx];
     }
     assert(cm->frame_type != KEY_FRAME);
     setup_pre_planes(xd, 0, ref_fb, mi_row, mi_col,
                      &xd->scale_factor[0]);
     setup_pre_planes(xd, 1, second_ref_fb, mi_row, mi_col,
                      &xd->scale_factor[1]);
     vp9_build_inter_predictors_sb(xd, mi_row, mi_col, MAX(bsize, BLOCK_8X8));
   }
   if (!is_inter_block(mbmi)) {
     vp9_tokenize_sb(cpi, t, !output_enabled, MAX(bsize, BLOCK_8X8));
   } else if (!x->skip) {
     vp9_encode_sb(x, MAX(bsize, BLOCK_8X8));
     vp9_tokenize_sb(cpi, t, !output_enabled, MAX(bsize, BLOCK_8X8));
   } else {
     int mb_skip_context = xd->left_available ? mi_8x8[-1]->mbmi.skip_coeff : 0;
     mb_skip_context += mi_8x8[-mis] ? mi_8x8[-mis]->mbmi.skip_coeff : 0;
     mbmi->skip_coeff = 1;
     if (output_enabled)
       cm->counts.mbskip[mb_skip_context][1]++;
     reset_skip_context(xd, MAX(bsize, BLOCK_8X8));
   }
   if (output_enabled) {
     if (cm->tx_mode == TX_MODE_SELECT &&
         mbmi->sb_type >= BLOCK_8X8  &&
         !(is_inter_block(mbmi) &&
             (mbmi->skip_coeff ||
              vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)))) {
       const uint8_t context = vp9_get_pred_context_tx_size(xd);
       ++get_tx_counts(max_txsize_lookup[bsize],
                       context, &cm->counts.tx)[mbmi->tx_size];
     } else {
       int x, y;
       TX_SIZE sz = tx_mode_to_biggest_tx_size[cm->tx_mode];
       assert(sizeof(tx_mode_to_biggest_tx_size) /
              sizeof(tx_mode_to_biggest_tx_size[0]) == TX_MODES);
       // The new intra coding scheme requires no change of transform size
       if (is_inter_block(&mi->mbmi)) {
         if (sz == TX_32X32 && bsize < BLOCK_32X32)
           sz = TX_16X16;
         if (sz == TX_16X16 && bsize < BLOCK_16X16)
           sz = TX_8X8;
         if (sz == TX_8X8 && bsize < BLOCK_8X8)
           sz = TX_4X4;
       } else if (bsize >= BLOCK_8X8) {
         sz = mbmi->tx_size;
       } else {
         sz = TX_4X4;
       }
       for (y = 0; y < mi_height; y++)
         for (x = 0; x < mi_width; x++)
           if (mi_col + x < cm->mi_cols && mi_row + y < cm->mi_rows)
             mi_8x8[mis * y + x]->mbmi.tx_size = sz;
     }
   }
 }

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media/libvpx/vp9/encoder/vp9_encodeframe.c@b8a032363ba2 (annotated)

media/libvpx/vp9/encoder/vp9_encodeframe.c