The Tor Browser: media/libvpx/vp9/encoder/vp9_encodemb.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_encodemb.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_encodemb.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 "./vp9_rtcd.h"
 #include "./vpx_config.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vp9/common/vp9_idct.h"
 #include "vp9/common/vp9_reconinter.h"
 #include "vp9/common/vp9_reconintra.h"
 #include "vp9/common/vp9_systemdependent.h"
 #include "vp9/encoder/vp9_dct.h"
 #include "vp9/encoder/vp9_encodemb.h"
 #include "vp9/encoder/vp9_quantize.h"
 #include "vp9/encoder/vp9_rdopt.h"
 #include "vp9/encoder/vp9_tokenize.h"
 void vp9_subtract_block_c(int rows, int cols,
                           int16_t *diff_ptr, ptrdiff_t diff_stride,
                           const uint8_t *src_ptr, ptrdiff_t src_stride,
                           const uint8_t *pred_ptr, ptrdiff_t pred_stride) {
   int r, c;
   for (r = 0; r < rows; r++) {
     for (c = 0; c < cols; c++)
       diff_ptr[c] = src_ptr[c] - pred_ptr[c];
     diff_ptr += diff_stride;
     pred_ptr += pred_stride;
     src_ptr  += src_stride;
   }
 }
 static void subtract_plane(MACROBLOCK *x, BLOCK_SIZE bsize, int plane) {
   struct macroblock_plane *const p = &x->plane[plane];
   const MACROBLOCKD *const xd = &x->e_mbd;
   const struct macroblockd_plane *const pd = &xd->plane[plane];
   const int bw = plane_block_width(bsize, pd);
   const int bh = plane_block_height(bsize, pd);
   vp9_subtract_block(bh, bw, p->src_diff, bw,
                      p->src.buf, p->src.stride,
                      pd->dst.buf, pd->dst.stride);
 }
 void vp9_subtract_sby(MACROBLOCK *x, BLOCK_SIZE bsize) {
   subtract_plane(x, bsize, 0);
 }
 void vp9_subtract_sbuv(MACROBLOCK *x, BLOCK_SIZE bsize) {
   int i;
   for (i = 1; i < MAX_MB_PLANE; i++)
     subtract_plane(x, bsize, i);
 }
 void vp9_subtract_sb(MACROBLOCK *x, BLOCK_SIZE bsize) {
   vp9_subtract_sby(x, bsize);
   vp9_subtract_sbuv(x, bsize);
 }
 #define RDTRUNC(RM, DM, R, D) ((128 + (R) * (RM)) & 0xFF)
 typedef struct vp9_token_state vp9_token_state;
 struct vp9_token_state {
   int           rate;
   int           error;
   int           next;
   signed char   token;
   short         qc;
 };
 // TODO(jimbankoski): experiment to find optimal RD numbers.
 #define Y1_RD_MULT 4
 #define UV_RD_MULT 2
 static const int plane_rd_mult[4] = {
   Y1_RD_MULT,
   UV_RD_MULT,
 };
 #define UPDATE_RD_COST()\
 {\
   rd_cost0 = RDCOST(rdmult, rddiv, rate0, error0);\
   rd_cost1 = RDCOST(rdmult, rddiv, rate1, error1);\
   if (rd_cost0 == rd_cost1) {\
     rd_cost0 = RDTRUNC(rdmult, rddiv, rate0, error0);\
     rd_cost1 = RDTRUNC(rdmult, rddiv, rate1, error1);\
   }\
 }
 // This function is a place holder for now but may ultimately need
 // to scan previous tokens to work out the correct context.
 static int trellis_get_coeff_context(const int16_t *scan,
                                      const int16_t *nb,
                                      int idx, int token,
                                      uint8_t *token_cache) {
   int bak = token_cache[scan[idx]], pt;
   token_cache[scan[idx]] = vp9_pt_energy_class[token];
   pt = get_coef_context(nb, token_cache, idx + 1);
   token_cache[scan[idx]] = bak;
   return pt;
 }
 static void optimize_b(MACROBLOCK *mb,
                        int plane, int block, BLOCK_SIZE plane_bsize,
                        ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l,
                        TX_SIZE tx_size) {
   MACROBLOCKD *const xd = &mb->e_mbd;
   struct macroblockd_plane *pd = &xd->plane[plane];
   const int ref = is_inter_block(&xd->mi_8x8[0]->mbmi);
   vp9_token_state tokens[1025][2];
   unsigned best_index[1025][2];
   const int16_t *coeff_ptr = BLOCK_OFFSET(mb->plane[plane].coeff, block);
   int16_t *qcoeff_ptr;
   int16_t *dqcoeff_ptr;
   int eob = pd->eobs[block], final_eob, sz = 0;
   const int i0 = 0;
   int rc, x, next, i;
   int64_t rdmult, rddiv, rd_cost0, rd_cost1;
   int rate0, rate1, error0, error1, t0, t1;
   int best, band, pt;
   PLANE_TYPE type = pd->plane_type;
   int err_mult = plane_rd_mult[type];
   const int default_eob = 16 << (tx_size << 1);
   const int16_t *scan, *nb;
   const int mul = 1 + (tx_size == TX_32X32);
   uint8_t token_cache[1024];
   const int16_t *dequant_ptr = pd->dequant;
   const uint8_t *const band_translate = get_band_translate(tx_size);
   assert((!type && !plane) || (type && plane));
   dqcoeff_ptr = BLOCK_OFFSET(pd->dqcoeff, block);
   qcoeff_ptr = BLOCK_OFFSET(pd->qcoeff, block);
   get_scan(xd, tx_size, type, block, &scan, &nb);
   assert(eob <= default_eob);
   /* Now set up a Viterbi trellis to evaluate alternative roundings. */
   rdmult = mb->rdmult * err_mult;
   if (mb->e_mbd.mi_8x8[0]->mbmi.ref_frame[0] == INTRA_FRAME)
     rdmult = (rdmult * 9) >> 4;
   rddiv = mb->rddiv;
   /* Initialize the sentinel node of the trellis. */
   tokens[eob][0].rate = 0;
   tokens[eob][0].error = 0;
   tokens[eob][0].next = default_eob;
   tokens[eob][0].token = DCT_EOB_TOKEN;
   tokens[eob][0].qc = 0;
   *(tokens[eob] + 1) = *(tokens[eob] + 0);
   next = eob;
   for (i = 0; i < eob; i++)
     token_cache[scan[i]] = vp9_pt_energy_class[vp9_dct_value_tokens_ptr[
         qcoeff_ptr[scan[i]]].token];
   for (i = eob; i-- > i0;) {
     int base_bits, d2, dx;
     rc = scan[i];
     x = qcoeff_ptr[rc];
     /* Only add a trellis state for non-zero coefficients. */
     if (x) {
       int shortcut = 0;
       error0 = tokens[next][0].error;
       error1 = tokens[next][1].error;
       /* Evaluate the first possibility for this state. */
       rate0 = tokens[next][0].rate;
       rate1 = tokens[next][1].rate;
       t0 = (vp9_dct_value_tokens_ptr + x)->token;
       /* Consider both possible successor states. */
       if (next < default_eob) {
         band = band_translate[i + 1];
         pt = trellis_get_coeff_context(scan, nb, i, t0, token_cache);
         rate0 +=
           mb->token_costs[tx_size][type][ref][band][0][pt]
                          [tokens[next][0].token];
         rate1 +=
           mb->token_costs[tx_size][type][ref][band][0][pt]
                          [tokens[next][1].token];
       }
       UPDATE_RD_COST();
       /* And pick the best. */
       best = rd_cost1 < rd_cost0;
       base_bits = *(vp9_dct_value_cost_ptr + x);
       dx = mul * (dqcoeff_ptr[rc] - coeff_ptr[rc]);
       d2 = dx * dx;
       tokens[i][0].rate = base_bits + (best ? rate1 : rate0);
       tokens[i][0].error = d2 + (best ? error1 : error0);
       tokens[i][0].next = next;
       tokens[i][0].token = t0;
       tokens[i][0].qc = x;
       best_index[i][0] = best;
       /* Evaluate the second possibility for this state. */
       rate0 = tokens[next][0].rate;
       rate1 = tokens[next][1].rate;
       if ((abs(x)*dequant_ptr[rc != 0] > abs(coeff_ptr[rc]) * mul) &&
           (abs(x)*dequant_ptr[rc != 0] < abs(coeff_ptr[rc]) * mul +
                                          dequant_ptr[rc != 0]))
         shortcut = 1;
       else
         shortcut = 0;
       if (shortcut) {
         sz = -(x < 0);
         x -= 2 * sz + 1;
       }
       /* Consider both possible successor states. */
       if (!x) {
         /* If we reduced this coefficient to zero, check to see if
          *  we need to move the EOB back here.
          */
         t0 = tokens[next][0].token == DCT_EOB_TOKEN ?
              DCT_EOB_TOKEN : ZERO_TOKEN;
         t1 = tokens[next][1].token == DCT_EOB_TOKEN ?
              DCT_EOB_TOKEN : ZERO_TOKEN;
       } else {
         t0 = t1 = (vp9_dct_value_tokens_ptr + x)->token;
       }
       if (next < default_eob) {
         band = band_translate[i + 1];
         if (t0 != DCT_EOB_TOKEN) {
           pt = trellis_get_coeff_context(scan, nb, i, t0, token_cache);
           rate0 += mb->token_costs[tx_size][type][ref][band][!x][pt]
                                   [tokens[next][0].token];
         }
         if (t1 != DCT_EOB_TOKEN) {
           pt = trellis_get_coeff_context(scan, nb, i, t1, token_cache);
           rate1 += mb->token_costs[tx_size][type][ref][band][!x][pt]
                                   [tokens[next][1].token];
         }
       }
       UPDATE_RD_COST();
       /* And pick the best. */
       best = rd_cost1 < rd_cost0;
       base_bits = *(vp9_dct_value_cost_ptr + x);
       if (shortcut) {
         dx -= (dequant_ptr[rc != 0] + sz) ^ sz;
         d2 = dx * dx;
       }
       tokens[i][1].rate = base_bits + (best ? rate1 : rate0);
       tokens[i][1].error = d2 + (best ? error1 : error0);
       tokens[i][1].next = next;
       tokens[i][1].token = best ? t1 : t0;
       tokens[i][1].qc = x;
       best_index[i][1] = best;
       /* Finally, make this the new head of the trellis. */
       next = i;
     } else {
       /* There's no choice to make for a zero coefficient, so we don't
        *  add a new trellis node, but we do need to update the costs.
        */
       band = band_translate[i + 1];
       t0 = tokens[next][0].token;
       t1 = tokens[next][1].token;
       /* Update the cost of each path if we're past the EOB token. */
       if (t0 != DCT_EOB_TOKEN) {
         tokens[next][0].rate +=
             mb->token_costs[tx_size][type][ref][band][1][0][t0];
         tokens[next][0].token = ZERO_TOKEN;
       }
       if (t1 != DCT_EOB_TOKEN) {
         tokens[next][1].rate +=
             mb->token_costs[tx_size][type][ref][band][1][0][t1];
         tokens[next][1].token = ZERO_TOKEN;
       }
       best_index[i][0] = best_index[i][1] = 0;
       /* Don't update next, because we didn't add a new node. */
     }
   }
   /* Now pick the best path through the whole trellis. */
   band = band_translate[i + 1];
   pt = combine_entropy_contexts(*a, *l);
   rate0 = tokens[next][0].rate;
   rate1 = tokens[next][1].rate;
   error0 = tokens[next][0].error;
   error1 = tokens[next][1].error;
   t0 = tokens[next][0].token;
   t1 = tokens[next][1].token;
   rate0 += mb->token_costs[tx_size][type][ref][band][0][pt][t0];
   rate1 += mb->token_costs[tx_size][type][ref][band][0][pt][t1];
   UPDATE_RD_COST();
   best = rd_cost1 < rd_cost0;
   final_eob = i0 - 1;
   vpx_memset(qcoeff_ptr, 0, sizeof(*qcoeff_ptr) * (16 << (tx_size * 2)));
   vpx_memset(dqcoeff_ptr, 0, sizeof(*dqcoeff_ptr) * (16 << (tx_size * 2)));
   for (i = next; i < eob; i = next) {
     x = tokens[i][best].qc;
     if (x) {
       final_eob = i;
     }
     rc = scan[i];
     qcoeff_ptr[rc] = x;
     dqcoeff_ptr[rc] = (x * dequant_ptr[rc != 0]) / mul;
     next = tokens[i][best].next;
     best = best_index[i][best];
   }
   final_eob++;
   xd->plane[plane].eobs[block] = final_eob;
   *a = *l = (final_eob > 0);
 }
 void vp9_optimize_b(int plane, int block, BLOCK_SIZE plane_bsize,
                     TX_SIZE tx_size, MACROBLOCK *mb, struct optimize_ctx *ctx) {
   int x, y;
   txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &x, &y);
   optimize_b(mb, plane, block, plane_bsize,
              &ctx->ta[plane][x], &ctx->tl[plane][y], tx_size);
 }
 static void optimize_init_b(int plane, BLOCK_SIZE bsize,
                             struct encode_b_args *args) {
   const MACROBLOCKD *xd = &args->x->e_mbd;
   const struct macroblockd_plane* const pd = &xd->plane[plane];
   const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
   const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];
   const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];
   const MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   const TX_SIZE tx_size = plane ? get_uv_tx_size(mbmi) : mbmi->tx_size;
   vp9_get_entropy_contexts(tx_size, args->ctx->ta[plane], args->ctx->tl[plane],
                            pd->above_context, pd->left_context,
                            num_4x4_w, num_4x4_h);
 }
 void vp9_xform_quant(int plane, int block, BLOCK_SIZE plane_bsize,
                      TX_SIZE tx_size, void *arg) {
   struct encode_b_args* const 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];
   int16_t *coeff = BLOCK_OFFSET(p->coeff, block);
   int16_t *qcoeff = BLOCK_OFFSET(pd->qcoeff, block);
   int16_t *dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
   const int16_t *scan, *iscan;
   uint16_t *eob = &pd->eobs[block];
   const int bwl = b_width_log2(plane_bsize), bw = 1 << bwl;
   const int twl = bwl - tx_size, twmask = (1 << twl) - 1;
   int xoff, yoff;
   int16_t *src_diff;
   switch (tx_size) {
     case TX_32X32:
       scan = vp9_default_scan_32x32;
       iscan = vp9_default_iscan_32x32;
       block >>= 6;
       xoff = 32 * (block & twmask);
       yoff = 32 * (block >> twl);
       src_diff = p->src_diff + 4 * bw * yoff + xoff;
       if (x->use_lp32x32fdct)
         vp9_fdct32x32_rd(src_diff, coeff, bw * 4);
       else
         vp9_fdct32x32(src_diff, coeff, bw * 4);
       vp9_quantize_b_32x32(coeff, 1024, x->skip_block, p->zbin, p->round,
                            p->quant, p->quant_shift, qcoeff, dqcoeff,
                            pd->dequant, p->zbin_extra, eob, scan, iscan);
       break;
     case TX_16X16:
       scan = vp9_default_scan_16x16;
       iscan = vp9_default_iscan_16x16;
       block >>= 4;
       xoff = 16 * (block & twmask);
       yoff = 16 * (block >> twl);
       src_diff = p->src_diff + 4 * bw * yoff + xoff;
       vp9_fdct16x16(src_diff, coeff, bw * 4);
       vp9_quantize_b(coeff, 256, x->skip_block, p->zbin, p->round,
                      p->quant, p->quant_shift, qcoeff, dqcoeff,
                      pd->dequant, p->zbin_extra, eob, scan, iscan);
       break;
     case TX_8X8:
       scan = vp9_default_scan_8x8;
       iscan = vp9_default_iscan_8x8;
       block >>= 2;
       xoff = 8 * (block & twmask);
       yoff = 8 * (block >> twl);
       src_diff = p->src_diff + 4 * bw * yoff + xoff;
       vp9_fdct8x8(src_diff, coeff, bw * 4);
       vp9_quantize_b(coeff, 64, x->skip_block, p->zbin, p->round,
                      p->quant, p->quant_shift, qcoeff, dqcoeff,
                      pd->dequant, p->zbin_extra, eob, scan, iscan);
       break;
     case TX_4X4:
       scan = vp9_default_scan_4x4;
       iscan = vp9_default_iscan_4x4;
       xoff = 4 * (block & twmask);
       yoff = 4 * (block >> twl);
       src_diff = p->src_diff + 4 * bw * yoff + xoff;
       x->fwd_txm4x4(src_diff, coeff, bw * 4);
       vp9_quantize_b(coeff, 16, x->skip_block, p->zbin, p->round,
                      p->quant, p->quant_shift, qcoeff, dqcoeff,
                      pd->dequant, p->zbin_extra, eob, scan, iscan);
       break;
     default:
       assert(0);
   }
 }
 static void encode_block(int plane, int block, BLOCK_SIZE plane_bsize,
                          TX_SIZE tx_size, void *arg) {
   struct encode_b_args *const args = arg;
   MACROBLOCK *const x = args->x;
   MACROBLOCKD *const xd = &x->e_mbd;
   struct optimize_ctx *const ctx = args->ctx;
   struct macroblockd_plane *const pd = &xd->plane[plane];
   int16_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
   int i, j;
   uint8_t *dst;
   txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &i, &j);
   dst = &pd->dst.buf[4 * j * pd->dst.stride + 4 * i];
   // TODO(jingning): per transformed block zero forcing only enabled for
   // luma component. will integrate chroma components as well.
   if (x->zcoeff_blk[tx_size][block] && plane == 0) {
     pd->eobs[block] = 0;
     ctx->ta[plane][i] = 0;
     ctx->tl[plane][j] = 0;
     return;
   }
   if (!x->skip_recode)
     vp9_xform_quant(plane, block, plane_bsize, tx_size, arg);
   if (x->optimize && (!x->skip_recode || !x->skip_optimize)) {
     vp9_optimize_b(plane, block, plane_bsize, tx_size, x, ctx);
   } else {
     ctx->ta[plane][i] = pd->eobs[block] > 0;
     ctx->tl[plane][j] = pd->eobs[block] > 0;
   }
   if (x->skip_encode || pd->eobs[block] == 0)
     return;
   switch (tx_size) {
     case TX_32X32:
       vp9_idct32x32_add(dqcoeff, dst, pd->dst.stride, pd->eobs[block]);
       break;
     case TX_16X16:
       vp9_idct16x16_add(dqcoeff, dst, pd->dst.stride, pd->eobs[block]);
       break;
     case TX_8X8:
       vp9_idct8x8_add(dqcoeff, dst, pd->dst.stride, pd->eobs[block]);
       break;
     case TX_4X4:
       // this is like vp9_short_idct4x4 but has a special case around eob<=1
       // which is significant (not just an optimization) for the lossless
       // case.
       xd->itxm_add(dqcoeff, dst, pd->dst.stride, pd->eobs[block]);
       break;
     default:
       assert(!"Invalid transform size");
   }
 }
 static void encode_block_pass1(int plane, int block, BLOCK_SIZE plane_bsize,
                                TX_SIZE tx_size, void *arg) {
   struct encode_b_args *const args = arg;
   MACROBLOCK *const x = args->x;
   MACROBLOCKD *const xd = &x->e_mbd;
   struct macroblockd_plane *const pd = &xd->plane[plane];
   const int raster_block = txfrm_block_to_raster_block(plane_bsize, tx_size,
                                                        block);
   int16_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
   uint8_t *const dst = raster_block_offset_uint8(plane_bsize, raster_block,
                                                  pd->dst.buf, pd->dst.stride);
   vp9_xform_quant(plane, block, plane_bsize, tx_size, arg);
   if (pd->eobs[block] == 0)
     return;
   xd->itxm_add(dqcoeff, dst, pd->dst.stride, pd->eobs[block]);
 }
 void vp9_encode_sby(MACROBLOCK *x, BLOCK_SIZE bsize) {
   MACROBLOCKD *const xd = &x->e_mbd;
   struct optimize_ctx ctx;
   struct encode_b_args arg = {x, &ctx};
   vp9_subtract_sby(x, bsize);
   if (x->optimize)
     optimize_init_b(0, bsize, &arg);
   foreach_transformed_block_in_plane(xd, bsize, 0, encode_block_pass1, &arg);
 }
 void vp9_encode_sb(MACROBLOCK *x, BLOCK_SIZE bsize) {
   MACROBLOCKD *const xd = &x->e_mbd;
   struct optimize_ctx ctx;
   struct encode_b_args arg = {x, &ctx};
   if (!x->skip_recode)
     vp9_subtract_sb(x, bsize);
   if (x->optimize && (!x->skip_recode || !x->skip_optimize)) {
     int i;
     for (i = 0; i < MAX_MB_PLANE; ++i)
       optimize_init_b(i, bsize, &arg);
   }
   foreach_transformed_block(xd, bsize, encode_block, &arg);
 }
 void vp9_encode_block_intra(int plane, int block, BLOCK_SIZE plane_bsize,
                             TX_SIZE tx_size, void *arg) {
   struct encode_b_args* const args = arg;
   MACROBLOCK *const x = args->x;
   MACROBLOCKD *const xd = &x->e_mbd;
   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;
   struct macroblock_plane *const p = &x->plane[plane];
   struct macroblockd_plane *const pd = &xd->plane[plane];
   int16_t *coeff = BLOCK_OFFSET(p->coeff, block);
   int16_t *qcoeff = BLOCK_OFFSET(pd->qcoeff, block);
   int16_t *dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
   const int16_t *scan, *iscan;
   TX_TYPE tx_type;
   MB_PREDICTION_MODE mode;
   const int bwl = b_width_log2(plane_bsize), bw = 1 << bwl;
   const int twl = bwl - tx_size, twmask = (1 << twl) - 1;
   int xoff, yoff;
   uint8_t *src, *dst;
   int16_t *src_diff;
   uint16_t *eob = &pd->eobs[block];
   if (xd->mb_to_right_edge < 0 || xd->mb_to_bottom_edge < 0)
     extend_for_intra(xd, plane_bsize, plane, block, tx_size);
   // if (x->optimize)
   // vp9_optimize_b(plane, block, plane_bsize, tx_size, x, args->ctx);
   switch (tx_size) {
     case TX_32X32:
       scan = vp9_default_scan_32x32;
       iscan = vp9_default_iscan_32x32;
       mode = plane == 0 ? mbmi->mode : mbmi->uv_mode;
       block >>= 6;
       xoff = 32 * (block & twmask);
       yoff = 32 * (block >> twl);
       dst = pd->dst.buf + yoff * pd->dst.stride + xoff;
       vp9_predict_intra_block(xd, block, bwl, TX_32X32, mode,
                               dst, pd->dst.stride, dst, pd->dst.stride);
       if (!x->skip_recode) {
         src = p->src.buf + yoff * p->src.stride + xoff;
         src_diff = p->src_diff + 4 * bw * yoff + xoff;
         vp9_subtract_block(32, 32, src_diff, bw * 4,
                            src, p->src.stride, dst, pd->dst.stride);
         if (x->use_lp32x32fdct)
           vp9_fdct32x32_rd(src_diff, coeff, bw * 4);
         else
           vp9_fdct32x32(src_diff, coeff, bw * 4);
         vp9_quantize_b_32x32(coeff, 1024, x->skip_block, p->zbin, p->round,
                              p->quant, p->quant_shift, qcoeff, dqcoeff,
                              pd->dequant, p->zbin_extra, eob, scan, iscan);
       }
       if (!x->skip_encode && *eob)
         vp9_idct32x32_add(dqcoeff, dst, pd->dst.stride, *eob);
       break;
     case TX_16X16:
       tx_type = get_tx_type_16x16(pd->plane_type, xd);
       scan = get_scan_16x16(tx_type);
       iscan = get_iscan_16x16(tx_type);
       mode = plane == 0 ? mbmi->mode : mbmi->uv_mode;
       block >>= 4;
       xoff = 16 * (block & twmask);
       yoff = 16 * (block >> twl);
       dst = pd->dst.buf + yoff * pd->dst.stride + xoff;
       vp9_predict_intra_block(xd, block, bwl, TX_16X16, mode,
                               dst, pd->dst.stride, dst, pd->dst.stride);
       if (!x->skip_recode) {
         src = p->src.buf + yoff * p->src.stride + xoff;
         src_diff = p->src_diff + 4 * bw * yoff + xoff;
         vp9_subtract_block(16, 16, src_diff, bw * 4,
                            src, p->src.stride, dst, pd->dst.stride);
         vp9_fht16x16(tx_type, src_diff, coeff, bw * 4);
         vp9_quantize_b(coeff, 256, x->skip_block, p->zbin, p->round,
                        p->quant, p->quant_shift, qcoeff, dqcoeff,
                        pd->dequant, p->zbin_extra, eob, scan, iscan);
       }
       if (!x->skip_encode && *eob)
         vp9_iht16x16_add(tx_type, dqcoeff, dst, pd->dst.stride, *eob);
       break;
     case TX_8X8:
       tx_type = get_tx_type_8x8(pd->plane_type, xd);
       scan = get_scan_8x8(tx_type);
       iscan = get_iscan_8x8(tx_type);
       mode = plane == 0 ? mbmi->mode : mbmi->uv_mode;
       block >>= 2;
       xoff = 8 * (block & twmask);
       yoff = 8 * (block >> twl);
       dst = pd->dst.buf + yoff * pd->dst.stride + xoff;
       vp9_predict_intra_block(xd, block, bwl, TX_8X8, mode,
                               dst, pd->dst.stride, dst, pd->dst.stride);
       if (!x->skip_recode) {
         src = p->src.buf + yoff * p->src.stride + xoff;
         src_diff = p->src_diff + 4 * bw * yoff + xoff;
         vp9_subtract_block(8, 8, src_diff, bw * 4,
                            src, p->src.stride, dst, pd->dst.stride);
         vp9_fht8x8(tx_type, src_diff, coeff, bw * 4);
         vp9_quantize_b(coeff, 64, x->skip_block, p->zbin, p->round, p->quant,
                        p->quant_shift, qcoeff, dqcoeff,
                        pd->dequant, p->zbin_extra, eob, scan, iscan);
       }
       if (!x->skip_encode && *eob)
         vp9_iht8x8_add(tx_type, dqcoeff, dst, pd->dst.stride, *eob);
       break;
     case TX_4X4:
       tx_type = get_tx_type_4x4(pd->plane_type, xd, block);
       scan = get_scan_4x4(tx_type);
       iscan = get_iscan_4x4(tx_type);
       if (mbmi->sb_type < BLOCK_8X8 && plane == 0)
         mode = xd->mi_8x8[0]->bmi[block].as_mode;
       else
         mode = plane == 0 ? mbmi->mode : mbmi->uv_mode;
       xoff = 4 * (block & twmask);
       yoff = 4 * (block >> twl);
       dst = pd->dst.buf + yoff * pd->dst.stride + xoff;
       vp9_predict_intra_block(xd, block, bwl, TX_4X4, mode,
                               dst, pd->dst.stride, dst, pd->dst.stride);
       if (!x->skip_recode) {
         src = p->src.buf + yoff * p->src.stride + xoff;
         src_diff = p->src_diff + 4 * bw * yoff + xoff;
         vp9_subtract_block(4, 4, src_diff, bw * 4,
                            src, p->src.stride, dst, pd->dst.stride);
         if (tx_type != DCT_DCT)
           vp9_short_fht4x4(src_diff, coeff, bw * 4, tx_type);
         else
           x->fwd_txm4x4(src_diff, coeff, bw * 4);
         vp9_quantize_b(coeff, 16, x->skip_block, p->zbin, p->round, p->quant,
                        p->quant_shift, qcoeff, dqcoeff,
                        pd->dequant, p->zbin_extra, eob, scan, iscan);
       }
       if (!x->skip_encode && *eob) {
         if (tx_type == DCT_DCT)
           // this is like vp9_short_idct4x4 but has a special case around eob<=1
           // which is significant (not just an optimization) for the lossless
           // case.
           xd->itxm_add(dqcoeff, dst, pd->dst.stride, *eob);
         else
           vp9_iht4x4_16_add(dqcoeff, dst, pd->dst.stride, tx_type);
       }
       break;
     default:
       assert(0);
   }
 }
 void vp9_encode_intra_block_y(MACROBLOCK *x, BLOCK_SIZE bsize) {
   MACROBLOCKD* const xd = &x->e_mbd;
   struct optimize_ctx ctx;
   struct encode_b_args arg = {x, &ctx};
   foreach_transformed_block_in_plane(xd, bsize, 0, vp9_encode_block_intra,
                                      &arg);
 }
 void vp9_encode_intra_block_uv(MACROBLOCK *x, BLOCK_SIZE bsize) {
   MACROBLOCKD* const xd = &x->e_mbd;
   struct optimize_ctx ctx;
   struct encode_b_args arg = {x, &ctx};
   foreach_transformed_block_uv(xd, bsize, vp9_encode_block_intra, &arg);
 }

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media/libvpx/vp9/encoder/vp9_encodemb.c