The Tor Browser: media/libvpx/vp9/decoder/vp9_decodframe.c@ac0c01689b40 (annotated)

media/libvpx/vp9/decoder/vp9_decodframe.c@ac0c01689b40 (annotated)

media/libvpx/vp9/decoder/vp9_decodframe.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 <assert.h>
 #include "./vp9_rtcd.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vpx_scale/vpx_scale.h"
 #include "vp9/common/vp9_alloccommon.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_idct.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/decoder/vp9_dboolhuff.h"
 #include "vp9/decoder/vp9_decodframe.h"
 #include "vp9/decoder/vp9_detokenize.h"
 #include "vp9/decoder/vp9_decodemv.h"
 #include "vp9/decoder/vp9_dsubexp.h"
 #include "vp9/decoder/vp9_onyxd_int.h"
 #include "vp9/decoder/vp9_read_bit_buffer.h"
 #include "vp9/decoder/vp9_thread.h"
 #include "vp9/decoder/vp9_treereader.h"
 typedef struct TileWorkerData {
   VP9_COMMON *cm;
   vp9_reader bit_reader;
   DECLARE_ALIGNED(16, MACROBLOCKD, xd);
   DECLARE_ALIGNED(16, unsigned char, token_cache[1024]);
   DECLARE_ALIGNED(16, int16_t,  qcoeff[MAX_MB_PLANE][64 * 64]);
   DECLARE_ALIGNED(16, int16_t,  dqcoeff[MAX_MB_PLANE][64 * 64]);
   DECLARE_ALIGNED(16, uint16_t, eobs[MAX_MB_PLANE][256]);
 } TileWorkerData;
 static int read_be32(const uint8_t *p) {
   return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
 }
 static int is_compound_prediction_allowed(const VP9_COMMON *cm) {
   int i;
   for (i = 1; i < ALLOWED_REFS_PER_FRAME; ++i)
     if  (cm->ref_frame_sign_bias[i + 1] != cm->ref_frame_sign_bias[1])
       return 1;
   return 0;
 }
 static void setup_compound_prediction(VP9_COMMON *cm) {
   if (cm->ref_frame_sign_bias[LAST_FRAME] ==
           cm->ref_frame_sign_bias[GOLDEN_FRAME]) {
     cm->comp_fixed_ref = ALTREF_FRAME;
     cm->comp_var_ref[0] = LAST_FRAME;
     cm->comp_var_ref[1] = GOLDEN_FRAME;
   } else if (cm->ref_frame_sign_bias[LAST_FRAME] ==
                  cm->ref_frame_sign_bias[ALTREF_FRAME]) {
     cm->comp_fixed_ref = GOLDEN_FRAME;
     cm->comp_var_ref[0] = LAST_FRAME;
     cm->comp_var_ref[1] = ALTREF_FRAME;
   } else {
     cm->comp_fixed_ref = LAST_FRAME;
     cm->comp_var_ref[0] = GOLDEN_FRAME;
     cm->comp_var_ref[1] = ALTREF_FRAME;
   }
 }
 // len == 0 is not allowed
 static int read_is_valid(const uint8_t *start, size_t len, const uint8_t *end) {
   return start + len > start && start + len <= end;
 }
 static int decode_unsigned_max(struct vp9_read_bit_buffer *rb, int max) {
   const int data = vp9_rb_read_literal(rb, get_unsigned_bits(max));
   return data > max ? max : data;
 }
 static TX_MODE read_tx_mode(vp9_reader *r) {
   TX_MODE tx_mode = vp9_read_literal(r, 2);
   if (tx_mode == ALLOW_32X32)
     tx_mode += vp9_read_bit(r);
   return tx_mode;
 }
 static void read_tx_probs(struct tx_probs *tx_probs, vp9_reader *r) {
   int i, j;
   for (i = 0; i < TX_SIZE_CONTEXTS; ++i)
     for (j = 0; j < TX_SIZES - 3; ++j)
       vp9_diff_update_prob(r, &tx_probs->p8x8[i][j]);
   for (i = 0; i < TX_SIZE_CONTEXTS; ++i)
     for (j = 0; j < TX_SIZES - 2; ++j)
       vp9_diff_update_prob(r, &tx_probs->p16x16[i][j]);
   for (i = 0; i < TX_SIZE_CONTEXTS; ++i)
     for (j = 0; j < TX_SIZES - 1; ++j)
       vp9_diff_update_prob(r, &tx_probs->p32x32[i][j]);
 }
 static void read_switchable_interp_probs(FRAME_CONTEXT *fc, vp9_reader *r) {
   int i, j;
   for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j)
     for (i = 0; i < SWITCHABLE_FILTERS - 1; ++i)
       vp9_diff_update_prob(r, &fc->switchable_interp_prob[j][i]);
 }
 static void read_inter_mode_probs(FRAME_CONTEXT *fc, vp9_reader *r) {
   int i, j;
   for (i = 0; i < INTER_MODE_CONTEXTS; ++i)
     for (j = 0; j < INTER_MODES - 1; ++j)
       vp9_diff_update_prob(r, &fc->inter_mode_probs[i][j]);
 }
 static INLINE COMPPREDMODE_TYPE read_comp_pred_mode(vp9_reader *r) {
   COMPPREDMODE_TYPE mode = vp9_read_bit(r);
   if (mode)
     mode += vp9_read_bit(r);
   return mode;
 }
 static void read_comp_pred(VP9_COMMON *cm, vp9_reader *r) {
   int i;
   const int compound_allowed = is_compound_prediction_allowed(cm);
   cm->comp_pred_mode = compound_allowed ? read_comp_pred_mode(r)
                                         : SINGLE_PREDICTION_ONLY;
   if (compound_allowed)
     setup_compound_prediction(cm);
   if (cm->comp_pred_mode == HYBRID_PREDICTION)
     for (i = 0; i < COMP_INTER_CONTEXTS; i++)
       vp9_diff_update_prob(r, &cm->fc.comp_inter_prob[i]);
   if (cm->comp_pred_mode != COMP_PREDICTION_ONLY)
     for (i = 0; i < REF_CONTEXTS; i++) {
       vp9_diff_update_prob(r, &cm->fc.single_ref_prob[i][0]);
       vp9_diff_update_prob(r, &cm->fc.single_ref_prob[i][1]);
     }
   if (cm->comp_pred_mode != SINGLE_PREDICTION_ONLY)
     for (i = 0; i < REF_CONTEXTS; i++)
       vp9_diff_update_prob(r, &cm->fc.comp_ref_prob[i]);
 }
 static void update_mv_probs(vp9_prob *p, int n, vp9_reader *r) {
   int i;
   for (i = 0; i < n; ++i)
     if (vp9_read(r, NMV_UPDATE_PROB))
        p[i] = (vp9_read_literal(r, 7) << 1) | 1;
 }
 static void read_mv_probs(nmv_context *ctx, int allow_hp, vp9_reader *r) {
   int i, j;
   update_mv_probs(ctx->joints, MV_JOINTS - 1, r);
   for (i = 0; i < 2; ++i) {
     nmv_component *const comp_ctx = &ctx->comps[i];
     update_mv_probs(&comp_ctx->sign, 1, r);
     update_mv_probs(comp_ctx->classes, MV_CLASSES - 1, r);
     update_mv_probs(comp_ctx->class0, CLASS0_SIZE - 1, r);
     update_mv_probs(comp_ctx->bits, MV_OFFSET_BITS, r);
   }
   for (i = 0; i < 2; ++i) {
     nmv_component *const comp_ctx = &ctx->comps[i];
     for (j = 0; j < CLASS0_SIZE; ++j)
       update_mv_probs(comp_ctx->class0_fp[j], 3, r);
     update_mv_probs(comp_ctx->fp, 3, r);
   }
   if (allow_hp) {
     for (i = 0; i < 2; ++i) {
       nmv_component *const comp_ctx = &ctx->comps[i];
       update_mv_probs(&comp_ctx->class0_hp, 1, r);
       update_mv_probs(&comp_ctx->hp, 1, r);
     }
   }
 }
 static void setup_plane_dequants(VP9_COMMON *cm, MACROBLOCKD *xd, int q_index) {
   int i;
   xd->plane[0].dequant = cm->y_dequant[q_index];
   for (i = 1; i < MAX_MB_PLANE; i++)
     xd->plane[i].dequant = cm->uv_dequant[q_index];
 }
 // Allocate storage for each tile column.
 // TODO(jzern): when max_threads <= 1 the same storage could be used for each
 // tile.
 static void alloc_tile_storage(VP9D_COMP *pbi, int tile_rows, int tile_cols) {
   VP9_COMMON *const cm = &pbi->common;
   const int aligned_mi_cols = mi_cols_aligned_to_sb(cm->mi_cols);
   int i, tile_row, tile_col;
   CHECK_MEM_ERROR(cm, pbi->mi_streams,
                   vpx_realloc(pbi->mi_streams, tile_rows * tile_cols *
                               sizeof(*pbi->mi_streams)));
   for (tile_row = 0; tile_row < tile_rows; ++tile_row) {
     for (tile_col = 0; tile_col < tile_cols; ++tile_col) {
       TileInfo tile;
       vp9_tile_init(&tile, cm, tile_row, tile_col);
       pbi->mi_streams[tile_row * tile_cols + tile_col] =
           &cm->mi[tile.mi_row_start * cm->mode_info_stride
                   + tile.mi_col_start];
     }
   }
   // 2 contexts per 'mi unit', so that we have one context per 4x4 txfm
   // block where mi unit size is 8x8.
   CHECK_MEM_ERROR(cm, pbi->above_context[0],
                   vpx_realloc(pbi->above_context[0],
                               sizeof(*pbi->above_context[0]) * MAX_MB_PLANE *
 * aligned_mi_cols));
   for (i = 1; i < MAX_MB_PLANE; ++i) {
     pbi->above_context[i] = pbi->above_context[0] +
                             i * sizeof(*pbi->above_context[0]) *
 * aligned_mi_cols;
   }
   // This is sized based on the entire frame. Each tile operates within its
   // column bounds.
   CHECK_MEM_ERROR(cm, pbi->above_seg_context,
                   vpx_realloc(pbi->above_seg_context,
                               sizeof(*pbi->above_seg_context) *
                               aligned_mi_cols));
 }
 static void inverse_transform_block(MACROBLOCKD* xd, int plane, int block,
                                     TX_SIZE tx_size, int x, int y) {
   struct macroblockd_plane *const pd = &xd->plane[plane];
   const int eob = pd->eobs[block];
   if (eob > 0) {
     TX_TYPE tx_type;
     const int plane_type = pd->plane_type;
     const int stride = pd->dst.stride;
     int16_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
     uint8_t *const dst = &pd->dst.buf[4 * y * stride + 4 * x];
     switch (tx_size) {
       case TX_4X4:
         tx_type = get_tx_type_4x4(plane_type, xd, block);
         if (tx_type == DCT_DCT)
           xd->itxm_add(dqcoeff, dst, stride, eob);
         else
           vp9_iht4x4_16_add(dqcoeff, dst, stride, tx_type);
         break;
       case TX_8X8:
         tx_type = get_tx_type_8x8(plane_type, xd);
         vp9_iht8x8_add(tx_type, dqcoeff, dst, stride, eob);
         break;
       case TX_16X16:
         tx_type = get_tx_type_16x16(plane_type, xd);
         vp9_iht16x16_add(tx_type, dqcoeff, dst, stride, eob);
         break;
       case TX_32X32:
         tx_type = DCT_DCT;
         vp9_idct32x32_add(dqcoeff, dst, stride, eob);
         break;
       default:
         assert(!"Invalid transform size");
     }
     if (eob == 1) {
       vpx_memset(dqcoeff, 0, 2 * sizeof(dqcoeff[0]));
     } else {
       if (tx_type == DCT_DCT && tx_size <= TX_16X16 && eob <= 10)
         vpx_memset(dqcoeff, 0, 4 * (4 << tx_size) * sizeof(dqcoeff[0]));
       else if (tx_size == TX_32X32 && eob <= 34)
         vpx_memset(dqcoeff, 0, 256 * sizeof(dqcoeff[0]));
       else
         vpx_memset(dqcoeff, 0, (16 << (tx_size << 1)) * sizeof(dqcoeff[0]));
     }
   }
 }
 struct intra_args {
   VP9_COMMON *cm;
   MACROBLOCKD *xd;
   vp9_reader *r;
   uint8_t *token_cache;
 };
 static void predict_and_reconstruct_intra_block(int plane, int block,
                                                 BLOCK_SIZE plane_bsize,
                                                 TX_SIZE tx_size, void *arg) {
   struct intra_args *const args = arg;
   VP9_COMMON *const cm = args->cm;
   MACROBLOCKD *const xd = args->xd;
   struct macroblockd_plane *const pd = &xd->plane[plane];
   MODE_INFO *const mi = xd->mi_8x8[0];
   const MB_PREDICTION_MODE mode = (plane == 0)
           ? ((mi->mbmi.sb_type < BLOCK_8X8) ? mi->bmi[block].as_mode
                                             : mi->mbmi.mode)
           : mi->mbmi.uv_mode;
   int x, y;
   uint8_t *dst;
   txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &x, &y);
   dst = &pd->dst.buf[4 * y * pd->dst.stride + 4 * x];
   if (xd->mb_to_right_edge < 0 || xd->mb_to_bottom_edge < 0)
     extend_for_intra(xd, plane_bsize, plane, block, tx_size);
   vp9_predict_intra_block(xd, block >> (tx_size << 1),
                           b_width_log2(plane_bsize), tx_size, mode,
                           dst, pd->dst.stride, dst, pd->dst.stride);
   if (!mi->mbmi.skip_coeff) {
     vp9_decode_block_tokens(cm, xd, plane, block, plane_bsize, x, y, tx_size,
                             args->r, args->token_cache);
     inverse_transform_block(xd, plane, block, tx_size, x, y);
   }
 }
 struct inter_args {
   VP9_COMMON *cm;
   MACROBLOCKD *xd;
   vp9_reader *r;
   int *eobtotal;
   uint8_t *token_cache;
 };
 static void reconstruct_inter_block(int plane, int block,
                                     BLOCK_SIZE plane_bsize,
                                     TX_SIZE tx_size, void *arg) {
   struct inter_args *args = arg;
   VP9_COMMON *const cm = args->cm;
   MACROBLOCKD *const xd = args->xd;
   int x, y;
   txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &x, &y);
   *args->eobtotal += vp9_decode_block_tokens(cm, xd, plane, block,
                                              plane_bsize, x, y, tx_size,
                                              args->r, args->token_cache);
   inverse_transform_block(xd, plane, block, tx_size, x, y);
 }
 static void set_offsets(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                         const TileInfo *const tile,
                         BLOCK_SIZE bsize, int mi_row, int mi_col) {
   const int bh = num_8x8_blocks_high_lookup[bsize];
   const int bw = num_8x8_blocks_wide_lookup[bsize];
   const int offset = mi_row * cm->mode_info_stride + mi_col;
   const int tile_offset = tile->mi_row_start * cm->mode_info_stride +
                           tile->mi_col_start;
   xd->mi_8x8 = cm->mi_grid_visible + offset;
   xd->prev_mi_8x8 = cm->prev_mi_grid_visible + offset;
   // we are using the mode info context stream here
   xd->mi_8x8[0] = xd->mi_stream + offset - tile_offset;
   xd->mi_8x8[0]->mbmi.sb_type = bsize;
   // 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;
   set_skip_context(xd, xd->above_context, xd->left_context, mi_row, mi_col);
   // Distance of Mb to the various image edges. These are specified to 8th pel
   // as they are always compared to values that are in 1/8th pel units
   set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols);
   setup_dst_planes(xd, get_frame_new_buffer(cm), mi_row, mi_col);
 }
 static void set_ref(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                     int idx, int mi_row, int mi_col) {
   MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
   const int ref = mbmi->ref_frame[idx] - LAST_FRAME;
   const YV12_BUFFER_CONFIG *cfg = get_frame_ref_buffer(cm, ref);
   const struct scale_factors_common *sfc = &cm->active_ref_scale_comm[ref];
   if (!vp9_is_valid_scale(sfc))
     vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                        "Invalid scale factors");
   xd->scale_factor[idx].sfc = sfc;
   setup_pre_planes(xd, idx, cfg, mi_row, mi_col, &xd->scale_factor[idx]);
   xd->corrupted |= cfg->corrupted;
 }
 static void decode_modes_b(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                            const TileInfo *const tile,
                            int mi_row, int mi_col,
                            vp9_reader *r, BLOCK_SIZE bsize,
                            uint8_t *token_cache) {
   const int less8x8 = bsize < BLOCK_8X8;
   MB_MODE_INFO *mbmi;
   set_offsets(cm, xd, tile, bsize, mi_row, mi_col);
   vp9_read_mode_info(cm, xd, tile, mi_row, mi_col, r);
   if (less8x8)
     bsize = BLOCK_8X8;
   // Has to be called after set_offsets
   mbmi = &xd->mi_8x8[0]->mbmi;
   if (mbmi->skip_coeff) {
     reset_skip_context(xd, bsize);
   } else {
     if (cm->seg.enabled)
       setup_plane_dequants(cm, xd, vp9_get_qindex(&cm->seg, mbmi->segment_id,
                                                   cm->base_qindex));
   }
   if (!is_inter_block(mbmi)) {
     struct intra_args arg = {
       cm, xd, r, token_cache
     };
     foreach_transformed_block(xd, bsize, predict_and_reconstruct_intra_block,
                               &arg);
   } else {
     // Setup
     set_ref(cm, xd, 0, mi_row, mi_col);
     if (has_second_ref(mbmi))
       set_ref(cm, xd, 1, mi_row, mi_col);
     xd->subpix.filter_x = xd->subpix.filter_y =
         vp9_get_filter_kernel(mbmi->interp_filter);
     // Prediction
     vp9_build_inter_predictors_sb(xd, mi_row, mi_col, bsize);
     // Reconstruction
     if (!mbmi->skip_coeff) {
       int eobtotal = 0;
       struct inter_args arg = {
         cm, xd, r, &eobtotal, token_cache
       };
       foreach_transformed_block(xd, bsize, reconstruct_inter_block, &arg);
       if (!less8x8 && eobtotal == 0)
         mbmi->skip_coeff = 1;  // skip loopfilter
     }
   }
   xd->corrupted |= vp9_reader_has_error(r);
 }
 static PARTITION_TYPE read_partition(VP9_COMMON *cm, MACROBLOCKD *xd, int hbs,
                                      int mi_row, int mi_col, BLOCK_SIZE bsize,
                                      vp9_reader *r) {
   const int ctx = partition_plane_context(xd->above_seg_context,
                                           xd->left_seg_context,
                                           mi_row, mi_col, bsize);
   const vp9_prob *const probs = get_partition_probs(cm, ctx);
   const int has_rows = (mi_row + hbs) < cm->mi_rows;
   const int has_cols = (mi_col + hbs) < cm->mi_cols;
   PARTITION_TYPE p;
   if (has_rows && has_cols)
     p = treed_read(r, vp9_partition_tree, probs);
   else if (!has_rows && has_cols)
     p = vp9_read(r, probs[1]) ? PARTITION_SPLIT : PARTITION_HORZ;
   else if (has_rows && !has_cols)
     p = vp9_read(r, probs[2]) ? PARTITION_SPLIT : PARTITION_VERT;
   else
     p = PARTITION_SPLIT;
   if (!cm->frame_parallel_decoding_mode)
     ++cm->counts.partition[ctx][p];
   return p;
 }
 static void decode_modes_sb(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                             const TileInfo *const tile,
                             int mi_row, int mi_col,
                             vp9_reader* r, BLOCK_SIZE bsize,
                             uint8_t *token_cache) {
   const int hbs = num_8x8_blocks_wide_lookup[bsize] / 2;
   PARTITION_TYPE partition;
   BLOCK_SIZE subsize;
   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
     return;
   partition = read_partition(cm, xd, hbs, mi_row, mi_col, bsize, r);
   subsize = get_subsize(bsize, partition);
   if (subsize < BLOCK_8X8) {
     decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize, token_cache);
   } else {
     switch (partition) {
       case PARTITION_NONE:
         decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize, token_cache);
         break;
       case PARTITION_HORZ:
         decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize, token_cache);
         if (mi_row + hbs < cm->mi_rows)
           decode_modes_b(cm, xd, tile, mi_row + hbs, mi_col, r, subsize,
                          token_cache);
         break;
       case PARTITION_VERT:
         decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize, token_cache);
         if (mi_col + hbs < cm->mi_cols)
           decode_modes_b(cm, xd, tile, mi_row, mi_col + hbs, r, subsize,
                          token_cache);
         break;
       case PARTITION_SPLIT:
         decode_modes_sb(cm, xd, tile, mi_row, mi_col, r, subsize,
                         token_cache);
         decode_modes_sb(cm, xd, tile, mi_row, mi_col + hbs, r, subsize,
                         token_cache);
         decode_modes_sb(cm, xd, tile, mi_row + hbs, mi_col, r, subsize,
                         token_cache);
         decode_modes_sb(cm, xd, tile, mi_row + hbs, mi_col + hbs, r, subsize,
                         token_cache);
         break;
       default:
         assert(!"Invalid partition type");
     }
   }
   // update partition context
   if (bsize >= BLOCK_8X8 &&
       (bsize == BLOCK_8X8 || partition != PARTITION_SPLIT))
     update_partition_context(xd->above_seg_context, xd->left_seg_context,
                              mi_row, mi_col, subsize, bsize);
 }
 static void setup_token_decoder(const uint8_t *data,
                                 const uint8_t *data_end,
                                 size_t read_size,
                                 struct vpx_internal_error_info *error_info,
                                 vp9_reader *r) {
   // Validate the calculated partition length. If the buffer
   // described by the partition can't be fully read, then restrict
   // it to the portion that can be (for EC mode) or throw an error.
   if (!read_is_valid(data, read_size, data_end))
     vpx_internal_error(error_info, VPX_CODEC_CORRUPT_FRAME,
                        "Truncated packet or corrupt tile length");
   if (vp9_reader_init(r, data, read_size))
     vpx_internal_error(error_info, VPX_CODEC_MEM_ERROR,
                        "Failed to allocate bool decoder %d", 1);
 }
 static void read_coef_probs_common(vp9_coeff_probs_model *coef_probs,
                                    vp9_reader *r) {
   int i, j, k, l, m;
   if (vp9_read_bit(r))
     for (i = 0; i < BLOCK_TYPES; i++)
       for (j = 0; j < REF_TYPES; j++)
         for (k = 0; k < COEF_BANDS; k++)
           for (l = 0; l < PREV_COEF_CONTEXTS; l++)
             if (k > 0 || l < 3)
               for (m = 0; m < UNCONSTRAINED_NODES; m++)
                 vp9_diff_update_prob(r, &coef_probs[i][j][k][l][m]);
 }
 static void read_coef_probs(FRAME_CONTEXT *fc, TX_MODE tx_mode,
                             vp9_reader *r) {
     const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode];
     TX_SIZE tx_size;
     for (tx_size = TX_4X4; tx_size <= max_tx_size; ++tx_size)
       read_coef_probs_common(fc->coef_probs[tx_size], r);
 }
 static void setup_segmentation(struct segmentation *seg,
                                struct vp9_read_bit_buffer *rb) {
   int i, j;
   seg->update_map = 0;
   seg->update_data = 0;
   seg->enabled = vp9_rb_read_bit(rb);
   if (!seg->enabled)
     return;
   // Segmentation map update
   seg->update_map = vp9_rb_read_bit(rb);
   if (seg->update_map) {
     for (i = 0; i < SEG_TREE_PROBS; i++)
       seg->tree_probs[i] = vp9_rb_read_bit(rb) ? vp9_rb_read_literal(rb, 8)
                                                : MAX_PROB;
     seg->temporal_update = vp9_rb_read_bit(rb);
     if (seg->temporal_update) {
       for (i = 0; i < PREDICTION_PROBS; i++)
         seg->pred_probs[i] = vp9_rb_read_bit(rb) ? vp9_rb_read_literal(rb, 8)
                                                  : MAX_PROB;
     } else {
       for (i = 0; i < PREDICTION_PROBS; i++)
         seg->pred_probs[i] = MAX_PROB;
     }
   }
   // Segmentation data update
   seg->update_data = vp9_rb_read_bit(rb);
   if (seg->update_data) {
     seg->abs_delta = vp9_rb_read_bit(rb);
     vp9_clearall_segfeatures(seg);
     for (i = 0; i < MAX_SEGMENTS; i++) {
       for (j = 0; j < SEG_LVL_MAX; j++) {
         int data = 0;
         const int feature_enabled = vp9_rb_read_bit(rb);
         if (feature_enabled) {
           vp9_enable_segfeature(seg, i, j);
           data = decode_unsigned_max(rb, vp9_seg_feature_data_max(j));
           if (vp9_is_segfeature_signed(j))
             data = vp9_rb_read_bit(rb) ? -data : data;
         }
         vp9_set_segdata(seg, i, j, data);
       }
     }
   }
 }
 static void setup_loopfilter(struct loopfilter *lf,
                              struct vp9_read_bit_buffer *rb) {
   lf->filter_level = vp9_rb_read_literal(rb, 6);
   lf->sharpness_level = vp9_rb_read_literal(rb, 3);
   // Read in loop filter deltas applied at the MB level based on mode or ref
   // frame.
   lf->mode_ref_delta_update = 0;
   lf->mode_ref_delta_enabled = vp9_rb_read_bit(rb);
   if (lf->mode_ref_delta_enabled) {
     lf->mode_ref_delta_update = vp9_rb_read_bit(rb);
     if (lf->mode_ref_delta_update) {
       int i;
       for (i = 0; i < MAX_REF_LF_DELTAS; i++)
         if (vp9_rb_read_bit(rb))
           lf->ref_deltas[i] = vp9_rb_read_signed_literal(rb, 6);
       for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
         if (vp9_rb_read_bit(rb))
           lf->mode_deltas[i] = vp9_rb_read_signed_literal(rb, 6);
     }
   }
 }
 static int read_delta_q(struct vp9_read_bit_buffer *rb, int *delta_q) {
   const int old = *delta_q;
   *delta_q = vp9_rb_read_bit(rb) ? vp9_rb_read_signed_literal(rb, 4) : 0;
   return old != *delta_q;
 }
 static void setup_quantization(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                                struct vp9_read_bit_buffer *rb) {
   int update = 0;
   cm->base_qindex = vp9_rb_read_literal(rb, QINDEX_BITS);
   update |= read_delta_q(rb, &cm->y_dc_delta_q);
   update |= read_delta_q(rb, &cm->uv_dc_delta_q);
   update |= read_delta_q(rb, &cm->uv_ac_delta_q);
   if (update)
     vp9_init_dequantizer(cm);
   xd->lossless = cm->base_qindex == 0 &&
                  cm->y_dc_delta_q == 0 &&
                  cm->uv_dc_delta_q == 0 &&
                  cm->uv_ac_delta_q == 0;
   xd->itxm_add = xd->lossless ? vp9_iwht4x4_add : vp9_idct4x4_add;
 }
 static INTERPOLATION_TYPE read_interp_filter_type(
                               struct vp9_read_bit_buffer *rb) {
   const INTERPOLATION_TYPE literal_to_type[] = { EIGHTTAP_SMOOTH,
                                                  EIGHTTAP,
                                                  EIGHTTAP_SHARP,
                                                  BILINEAR };
   return vp9_rb_read_bit(rb) ? SWITCHABLE
                              : literal_to_type[vp9_rb_read_literal(rb, 2)];
 }
 static void read_frame_size(struct vp9_read_bit_buffer *rb,
                             int *width, int *height) {
   const int w = vp9_rb_read_literal(rb, 16) + 1;
   const int h = vp9_rb_read_literal(rb, 16) + 1;
   *width = w;
   *height = h;
 }
 static void setup_display_size(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) {
   cm->display_width = cm->width;
   cm->display_height = cm->height;
   if (vp9_rb_read_bit(rb))
     read_frame_size(rb, &cm->display_width, &cm->display_height);
 }
 static void apply_frame_size(VP9D_COMP *pbi, int width, int height) {
   VP9_COMMON *cm = &pbi->common;
   if (cm->width != width || cm->height != height) {
     // Change in frame size.
     if (cm->width == 0 || cm->height == 0) {
       // Assign new frame buffer on first call.
       cm->new_fb_idx = NUM_YV12_BUFFERS - 1;
       cm->fb_idx_ref_cnt[cm->new_fb_idx] = 1;
     }
     // TODO(agrange) Don't test width/height, check overall size.
     if (width > cm->width || height > cm->height) {
       // Rescale frame buffers only if they're not big enough already.
       if (vp9_resize_frame_buffers(cm, width, height))
         vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                            "Failed to allocate frame buffers");
     }
     cm->width = width;
     cm->height = height;
     vp9_update_frame_size(cm);
   }
   vp9_realloc_frame_buffer(get_frame_new_buffer(cm), cm->width, cm->height,
                            cm->subsampling_x, cm->subsampling_y,
                            VP9BORDERINPIXELS);
 }
 static void setup_frame_size(VP9D_COMP *pbi,
                              struct vp9_read_bit_buffer *rb) {
   int width, height;
   read_frame_size(rb, &width, &height);
   apply_frame_size(pbi, width, height);
   setup_display_size(&pbi->common, rb);
 }
 static void setup_frame_size_with_refs(VP9D_COMP *pbi,
                                        struct vp9_read_bit_buffer *rb) {
   VP9_COMMON *const cm = &pbi->common;
   int width, height;
   int found = 0, i;
   for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i) {
     if (vp9_rb_read_bit(rb)) {
       YV12_BUFFER_CONFIG *const cfg = get_frame_ref_buffer(cm, i);
       width = cfg->y_crop_width;
       height = cfg->y_crop_height;
       found = 1;
       break;
     }
   }
   if (!found)
     read_frame_size(rb, &width, &height);
   if (!width || !height)
     vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME,
                        "Referenced frame with invalid size");
   apply_frame_size(pbi, width, height);
   setup_display_size(cm, rb);
 }
 static void setup_tile_context(VP9D_COMP *const pbi, MACROBLOCKD *const xd,
                                int tile_row, int tile_col) {
   int i;
   const int tile_cols = 1 << pbi->common.log2_tile_cols;
   xd->mi_stream = pbi->mi_streams[tile_row * tile_cols + tile_col];
   for (i = 0; i < MAX_MB_PLANE; ++i) {
     xd->above_context[i] = pbi->above_context[i];
   }
   // see note in alloc_tile_storage().
   xd->above_seg_context = pbi->above_seg_context;
 }
 static void decode_tile(VP9D_COMP *pbi, const TileInfo *const tile,
                         vp9_reader *r) {
   const int num_threads = pbi->oxcf.max_threads;
   VP9_COMMON *const cm = &pbi->common;
   int mi_row, mi_col;
   MACROBLOCKD *xd = &pbi->mb;
   if (pbi->do_loopfilter_inline) {
     LFWorkerData *const lf_data = (LFWorkerData*)pbi->lf_worker.data1;
     lf_data->frame_buffer = get_frame_new_buffer(cm);
     lf_data->cm = cm;
     lf_data->xd = pbi->mb;
     lf_data->stop = 0;
     lf_data->y_only = 0;
     vp9_loop_filter_frame_init(cm, cm->lf.filter_level);
   }
   for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end;
        mi_row += MI_BLOCK_SIZE) {
     // For a SB there are 2 left contexts, each pertaining to a MB row within
     vp9_zero(xd->left_context);
     vp9_zero(xd->left_seg_context);
     for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end;
          mi_col += MI_BLOCK_SIZE) {
       decode_modes_sb(cm, xd, tile, mi_row, mi_col, r, BLOCK_64X64,
                       pbi->token_cache);
     }
     if (pbi->do_loopfilter_inline) {
       const int lf_start = mi_row - MI_BLOCK_SIZE;
       LFWorkerData *const lf_data = (LFWorkerData*)pbi->lf_worker.data1;
       // delay the loopfilter by 1 macroblock row.
       if (lf_start < 0) continue;
       // decoding has completed: finish up the loop filter in this thread.
       if (mi_row + MI_BLOCK_SIZE >= tile->mi_row_end) continue;
       vp9_worker_sync(&pbi->lf_worker);
       lf_data->start = lf_start;
       lf_data->stop = mi_row;
       if (num_threads > 1) {
         vp9_worker_launch(&pbi->lf_worker);
       } else {
         vp9_worker_execute(&pbi->lf_worker);
       }
     }
   }
   if (pbi->do_loopfilter_inline) {
     LFWorkerData *const lf_data = (LFWorkerData*)pbi->lf_worker.data1;
     vp9_worker_sync(&pbi->lf_worker);
     lf_data->start = lf_data->stop;
     lf_data->stop = cm->mi_rows;
     vp9_worker_execute(&pbi->lf_worker);
   }
 }
 static void setup_tile_info(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) {
   int min_log2_tile_cols, max_log2_tile_cols, max_ones;
   vp9_get_tile_n_bits(cm->mi_cols, &min_log2_tile_cols, &max_log2_tile_cols);
   // columns
   max_ones = max_log2_tile_cols - min_log2_tile_cols;
   cm->log2_tile_cols = min_log2_tile_cols;
   while (max_ones-- && vp9_rb_read_bit(rb))
     cm->log2_tile_cols++;
   // rows
   cm->log2_tile_rows = vp9_rb_read_bit(rb);
   if (cm->log2_tile_rows)
     cm->log2_tile_rows += vp9_rb_read_bit(rb);
 }
 // Reads the next tile returning its size and adjusting '*data' accordingly
 // based on 'is_last'.
 static size_t get_tile(const uint8_t *const data_end,
                        int is_last,
                        struct vpx_internal_error_info *error_info,
                        const uint8_t **data) {
   size_t size;
   if (!is_last) {
     if (!read_is_valid(*data, 4, data_end))
       vpx_internal_error(error_info, VPX_CODEC_CORRUPT_FRAME,
           "Truncated packet or corrupt tile length");
     size = read_be32(*data);
     *data += 4;
     if (size > data_end - *data) {
       vpx_internal_error(error_info, VPX_CODEC_CORRUPT_FRAME,
           "Truncated packet or corrupt tile size");
     }
   } else {
     size = data_end - *data;
   }
   return size;
 }
 typedef struct TileBuffer {
   const uint8_t *data;
   size_t size;
 } TileBuffer;
 static const uint8_t *decode_tiles(VP9D_COMP *pbi, const uint8_t *data) {
   VP9_COMMON *const cm = &pbi->common;
   MACROBLOCKD *const xd = &pbi->mb;
   const int aligned_cols = mi_cols_aligned_to_sb(cm->mi_cols);
   const int tile_cols = 1 << cm->log2_tile_cols;
   const int tile_rows = 1 << cm->log2_tile_rows;
   TileBuffer tile_buffers[4][1 << 6];
   int tile_row, tile_col;
   const uint8_t *const data_end = pbi->source + pbi->source_sz;
   const uint8_t *end = NULL;
   vp9_reader r;
   assert(tile_rows <= 4);
   assert(tile_cols <= (1 << 6));
   // Note: this memset assumes above_context[0], [1] and [2]
   // are allocated as part of the same buffer.
   vpx_memset(pbi->above_context[0], 0,
              sizeof(*pbi->above_context[0]) * MAX_MB_PLANE * 2 * aligned_cols);
   vpx_memset(pbi->above_seg_context, 0,
              sizeof(*pbi->above_seg_context) * aligned_cols);
   // Load tile data into tile_buffers
   for (tile_row = 0; tile_row < tile_rows; ++tile_row) {
     for (tile_col = 0; tile_col < tile_cols; ++tile_col) {
       const int last_tile = tile_row == tile_rows - 1 &&
                             tile_col == tile_cols - 1;
       const size_t size = get_tile(data_end, last_tile, &cm->error, &data);
       TileBuffer *const buf = &tile_buffers[tile_row][tile_col];
       buf->data = data;
       buf->size = size;
       data += size;
     }
   }
   // Decode tiles using data from tile_buffers
   for (tile_row = 0; tile_row < tile_rows; ++tile_row) {
     for (tile_col = 0; tile_col < tile_cols; ++tile_col) {
       const int col = pbi->oxcf.inv_tile_order ? tile_cols - tile_col - 1
                                                : tile_col;
       const int last_tile = tile_row == tile_rows - 1 &&
                                  col == tile_cols - 1;
       const TileBuffer *const buf = &tile_buffers[tile_row][col];
       TileInfo tile;
       vp9_tile_init(&tile, cm, tile_row, col);
       setup_token_decoder(buf->data, data_end, buf->size, &cm->error, &r);
       setup_tile_context(pbi, xd, tile_row, col);
       decode_tile(pbi, &tile, &r);
       if (last_tile)
         end = vp9_reader_find_end(&r);
     }
   }
   return end;
 }
 static void setup_tile_macroblockd(TileWorkerData *const tile_data) {
   MACROBLOCKD *xd = &tile_data->xd;
   struct macroblockd_plane *const pd = xd->plane;
   int i;
   for (i = 0; i < MAX_MB_PLANE; ++i) {
     pd[i].qcoeff  = tile_data->qcoeff[i];
     pd[i].dqcoeff = tile_data->dqcoeff[i];
     pd[i].eobs    = tile_data->eobs[i];
     vpx_memset(xd->plane[i].dqcoeff, 0, 64 * 64 * sizeof(int16_t));
   }
 }
 static int tile_worker_hook(void *arg1, void *arg2) {
   TileWorkerData *const tile_data = (TileWorkerData*)arg1;
   const TileInfo *const tile = (TileInfo*)arg2;
   int mi_row, mi_col;
   for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end;
        mi_row += MI_BLOCK_SIZE) {
     vp9_zero(tile_data->xd.left_context);
     vp9_zero(tile_data->xd.left_seg_context);
     for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end;
          mi_col += MI_BLOCK_SIZE) {
       decode_modes_sb(tile_data->cm, &tile_data->xd, tile,
                       mi_row, mi_col, &tile_data->bit_reader, BLOCK_64X64,
                       tile_data->token_cache);
     }
   }
   return !tile_data->xd.corrupted;
 }
 static const uint8_t *decode_tiles_mt(VP9D_COMP *pbi, const uint8_t *data) {
   VP9_COMMON *const cm = &pbi->common;
   const uint8_t *const data_end = pbi->source + pbi->source_sz;
   const int aligned_mi_cols = mi_cols_aligned_to_sb(cm->mi_cols);
   const int tile_cols = 1 << cm->log2_tile_cols;
   const int tile_rows = 1 << cm->log2_tile_rows;
   const int num_workers = MIN(pbi->oxcf.max_threads & ~1, tile_cols);
   int tile_col = 0;
   assert(tile_rows == 1);
   (void)tile_rows;
   if (num_workers > pbi->num_tile_workers) {
     int i;
     CHECK_MEM_ERROR(cm, pbi->tile_workers,
                     vpx_realloc(pbi->tile_workers,
                                 num_workers * sizeof(*pbi->tile_workers)));
     for (i = pbi->num_tile_workers; i < num_workers; ++i) {
       VP9Worker *const worker = &pbi->tile_workers[i];
       ++pbi->num_tile_workers;
       vp9_worker_init(worker);
       worker->hook = (VP9WorkerHook)tile_worker_hook;
       CHECK_MEM_ERROR(cm, worker->data1,
                       vpx_memalign(32, sizeof(TileWorkerData)));
       CHECK_MEM_ERROR(cm, worker->data2, vpx_malloc(sizeof(TileInfo)));
       if (i < num_workers - 1 && !vp9_worker_reset(worker)) {
         vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
                            "Tile decoder thread creation failed");
       }
     }
   }
   // Note: this memset assumes above_context[0], [1] and [2]
   // are allocated as part of the same buffer.
   vpx_memset(pbi->above_context[0], 0,
              sizeof(*pbi->above_context[0]) * MAX_MB_PLANE *
 * aligned_mi_cols);
   vpx_memset(pbi->above_seg_context, 0,
              sizeof(*pbi->above_seg_context) * aligned_mi_cols);
   while (tile_col < tile_cols) {
     int i;
     for (i = 0; i < num_workers && tile_col < tile_cols; ++i) {
       VP9Worker *const worker = &pbi->tile_workers[i];
       TileWorkerData *const tile_data = (TileWorkerData*)worker->data1;
       TileInfo *const tile = (TileInfo*)worker->data2;
       const size_t size =
           get_tile(data_end, tile_col == tile_cols - 1, &cm->error, &data);
       tile_data->cm = cm;
       tile_data->xd = pbi->mb;
       tile_data->xd.corrupted = 0;
       vp9_tile_init(tile, tile_data->cm, 0, tile_col);
       setup_token_decoder(data, data_end, size, &cm->error,
                           &tile_data->bit_reader);
       setup_tile_context(pbi, &tile_data->xd, 0, tile_col);
       setup_tile_macroblockd(tile_data);
       worker->had_error = 0;
       if (i == num_workers - 1 || tile_col == tile_cols - 1) {
         vp9_worker_execute(worker);
       } else {
         vp9_worker_launch(worker);
       }
       data += size;
       ++tile_col;
     }
     for (; i > 0; --i) {
       VP9Worker *const worker = &pbi->tile_workers[i - 1];
       pbi->mb.corrupted |= !vp9_worker_sync(worker);
     }
   }
   {
     const int final_worker = (tile_cols + num_workers - 1) % num_workers;
     TileWorkerData *const tile_data =
         (TileWorkerData*)pbi->tile_workers[final_worker].data1;
     return vp9_reader_find_end(&tile_data->bit_reader);
   }
 }
 static void check_sync_code(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) {
   if (vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_0 ||
       vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_1 ||
       vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_2) {
     vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                        "Invalid frame sync code");
   }
 }
 static void error_handler(void *data, size_t bit_offset) {
   VP9_COMMON *const cm = (VP9_COMMON *)data;
   vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME, "Truncated packet");
 }
 #define RESERVED \
   if (vp9_rb_read_bit(rb)) \
       vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM, \
                          "Reserved bit must be unset")
 static size_t read_uncompressed_header(VP9D_COMP *pbi,
                                        struct vp9_read_bit_buffer *rb) {
   VP9_COMMON *const cm = &pbi->common;
   size_t sz;
   int i;
   cm->last_frame_type = cm->frame_type;
   if (vp9_rb_read_literal(rb, 2) != VP9_FRAME_MARKER)
       vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                          "Invalid frame marker");
   cm->version = vp9_rb_read_bit(rb);
   RESERVED;
   if (vp9_rb_read_bit(rb)) {
     // show an existing frame directly
     int frame_to_show = cm->ref_frame_map[vp9_rb_read_literal(rb, 3)];
     ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->new_fb_idx, frame_to_show);
     pbi->refresh_frame_flags = 0;
     cm->lf.filter_level = 0;
     return 0;
   }
   cm->frame_type = (FRAME_TYPE) vp9_rb_read_bit(rb);
   cm->show_frame = vp9_rb_read_bit(rb);
   cm->error_resilient_mode = vp9_rb_read_bit(rb);
   if (cm->frame_type == KEY_FRAME) {
     check_sync_code(cm, rb);
     cm->color_space = vp9_rb_read_literal(rb, 3);  // colorspace
     if (cm->color_space != SRGB) {
       vp9_rb_read_bit(rb);  // [16,235] (including xvycc) vs [0,255] range
       if (cm->version == 1) {
         cm->subsampling_x = vp9_rb_read_bit(rb);
         cm->subsampling_y = vp9_rb_read_bit(rb);
         vp9_rb_read_bit(rb);  // has extra plane
       } else {
         cm->subsampling_y = cm->subsampling_x = 1;
       }
     } else {
       if (cm->version == 1) {
         cm->subsampling_y = cm->subsampling_x = 0;
         vp9_rb_read_bit(rb);  // has extra plane
       } else {
         vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                            "RGB not supported in profile 0");
       }
     }
     pbi->refresh_frame_flags = (1 << NUM_REF_FRAMES) - 1;
     for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i)
       cm->active_ref_idx[i] = cm->new_fb_idx;
     setup_frame_size(pbi, rb);
   } else {
     cm->intra_only = cm->show_frame ? 0 : vp9_rb_read_bit(rb);
     cm->reset_frame_context = cm->error_resilient_mode ?
 : vp9_rb_read_literal(rb, 2);
     if (cm->intra_only) {
       check_sync_code(cm, rb);
       pbi->refresh_frame_flags = vp9_rb_read_literal(rb, NUM_REF_FRAMES);
       setup_frame_size(pbi, rb);
     } else {
       pbi->refresh_frame_flags = vp9_rb_read_literal(rb, NUM_REF_FRAMES);
       for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i) {
         const int ref = vp9_rb_read_literal(rb, NUM_REF_FRAMES_LOG2);
         cm->active_ref_idx[i] = cm->ref_frame_map[ref];
         cm->ref_frame_sign_bias[LAST_FRAME + i] = vp9_rb_read_bit(rb);
       }
       setup_frame_size_with_refs(pbi, rb);
       cm->allow_high_precision_mv = vp9_rb_read_bit(rb);
       cm->mcomp_filter_type = read_interp_filter_type(rb);
       for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i)
         vp9_setup_scale_factors(cm, i);
     }
   }
   if (!cm->error_resilient_mode) {
     cm->refresh_frame_context = vp9_rb_read_bit(rb);
     cm->frame_parallel_decoding_mode = vp9_rb_read_bit(rb);
   } else {
     cm->refresh_frame_context = 0;
     cm->frame_parallel_decoding_mode = 1;
   }
   // This flag will be overridden by the call to vp9_setup_past_independence
   // below, forcing the use of context 0 for those frame types.
   cm->frame_context_idx = vp9_rb_read_literal(rb, NUM_FRAME_CONTEXTS_LOG2);
   if (frame_is_intra_only(cm) || cm->error_resilient_mode)
     vp9_setup_past_independence(cm);
   setup_loopfilter(&cm->lf, rb);
   setup_quantization(cm, &pbi->mb, rb);
   setup_segmentation(&cm->seg, rb);
   setup_tile_info(cm, rb);
   sz = vp9_rb_read_literal(rb, 16);
   if (sz == 0)
     vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME,
                        "Invalid header size");
   return sz;
 }
 static int read_compressed_header(VP9D_COMP *pbi, const uint8_t *data,
                                   size_t partition_size) {
   VP9_COMMON *const cm = &pbi->common;
   MACROBLOCKD *const xd = &pbi->mb;
   FRAME_CONTEXT *const fc = &cm->fc;
   vp9_reader r;
   int k;
   if (vp9_reader_init(&r, data, partition_size))
     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                        "Failed to allocate bool decoder 0");
   cm->tx_mode = xd->lossless ? ONLY_4X4 : read_tx_mode(&r);
   if (cm->tx_mode == TX_MODE_SELECT)
     read_tx_probs(&fc->tx_probs, &r);
   read_coef_probs(fc, cm->tx_mode, &r);
   for (k = 0; k < MBSKIP_CONTEXTS; ++k)
     vp9_diff_update_prob(&r, &fc->mbskip_probs[k]);
   if (!frame_is_intra_only(cm)) {
     nmv_context *const nmvc = &fc->nmvc;
     int i, j;
     read_inter_mode_probs(fc, &r);
     if (cm->mcomp_filter_type == SWITCHABLE)
       read_switchable_interp_probs(fc, &r);
     for (i = 0; i < INTRA_INTER_CONTEXTS; i++)
       vp9_diff_update_prob(&r, &fc->intra_inter_prob[i]);
     read_comp_pred(cm, &r);
     for (j = 0; j < BLOCK_SIZE_GROUPS; j++)
       for (i = 0; i < INTRA_MODES - 1; ++i)
         vp9_diff_update_prob(&r, &fc->y_mode_prob[j][i]);
     for (j = 0; j < PARTITION_CONTEXTS; ++j)
       for (i = 0; i < PARTITION_TYPES - 1; ++i)
         vp9_diff_update_prob(&r, &fc->partition_prob[j][i]);
     read_mv_probs(nmvc, cm->allow_high_precision_mv, &r);
   }
   return vp9_reader_has_error(&r);
 }
 void vp9_init_dequantizer(VP9_COMMON *cm) {
   int q;
   for (q = 0; q < QINDEX_RANGE; q++) {
     cm->y_dequant[q][0] = vp9_dc_quant(q, cm->y_dc_delta_q);
     cm->y_dequant[q][1] = vp9_ac_quant(q, 0);
     cm->uv_dequant[q][0] = vp9_dc_quant(q, cm->uv_dc_delta_q);
     cm->uv_dequant[q][1] = vp9_ac_quant(q, cm->uv_ac_delta_q);
   }
 }
 #ifdef NDEBUG
 #define debug_check_frame_counts(cm) (void)0
 #else  // !NDEBUG
 // Counts should only be incremented when frame_parallel_decoding_mode and
 // error_resilient_mode are disabled.
 static void debug_check_frame_counts(const VP9_COMMON *const cm) {
   FRAME_COUNTS zero_counts;
   vp9_zero(zero_counts);
   assert(cm->frame_parallel_decoding_mode || cm->error_resilient_mode);
   assert(!memcmp(cm->counts.y_mode, zero_counts.y_mode,
                  sizeof(cm->counts.y_mode)));
   assert(!memcmp(cm->counts.uv_mode, zero_counts.uv_mode,
                  sizeof(cm->counts.uv_mode)));
   assert(!memcmp(cm->counts.partition, zero_counts.partition,
                  sizeof(cm->counts.partition)));
   assert(!memcmp(cm->counts.coef, zero_counts.coef,
                  sizeof(cm->counts.coef)));
   assert(!memcmp(cm->counts.eob_branch, zero_counts.eob_branch,
                  sizeof(cm->counts.eob_branch)));
   assert(!memcmp(cm->counts.switchable_interp, zero_counts.switchable_interp,
                  sizeof(cm->counts.switchable_interp)));
   assert(!memcmp(cm->counts.inter_mode, zero_counts.inter_mode,
                  sizeof(cm->counts.inter_mode)));
   assert(!memcmp(cm->counts.intra_inter, zero_counts.intra_inter,
                  sizeof(cm->counts.intra_inter)));
   assert(!memcmp(cm->counts.comp_inter, zero_counts.comp_inter,
                  sizeof(cm->counts.comp_inter)));
   assert(!memcmp(cm->counts.single_ref, zero_counts.single_ref,
                  sizeof(cm->counts.single_ref)));
   assert(!memcmp(cm->counts.comp_ref, zero_counts.comp_ref,
                  sizeof(cm->counts.comp_ref)));
   assert(!memcmp(&cm->counts.tx, &zero_counts.tx, sizeof(cm->counts.tx)));
   assert(!memcmp(cm->counts.mbskip, zero_counts.mbskip,
                  sizeof(cm->counts.mbskip)));
   assert(!memcmp(&cm->counts.mv, &zero_counts.mv, sizeof(cm->counts.mv)));
 }
 #endif  // NDEBUG
 int vp9_decode_frame(VP9D_COMP *pbi, const uint8_t **p_data_end) {
   int i;
   VP9_COMMON *const cm = &pbi->common;
   MACROBLOCKD *const xd = &pbi->mb;
   const uint8_t *data = pbi->source;
   const uint8_t *const data_end = pbi->source + pbi->source_sz;
   struct vp9_read_bit_buffer rb = { data, data_end, 0, cm, error_handler };
   const size_t first_partition_size = read_uncompressed_header(pbi, &rb);
   const int keyframe = cm->frame_type == KEY_FRAME;
   const int tile_rows = 1 << cm->log2_tile_rows;
   const int tile_cols = 1 << cm->log2_tile_cols;
   YV12_BUFFER_CONFIG *const new_fb = get_frame_new_buffer(cm);
   if (!first_partition_size) {
       // showing a frame directly
       *p_data_end = data + 1;
       return 0;
   }
   if (!pbi->decoded_key_frame && !keyframe)
     return -1;
   data += vp9_rb_bytes_read(&rb);
   if (!read_is_valid(data, first_partition_size, data_end))
     vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME,
                        "Truncated packet or corrupt header length");
   pbi->do_loopfilter_inline =
       (cm->log2_tile_rows | cm->log2_tile_cols) == 0 && cm->lf.filter_level;
   if (pbi->do_loopfilter_inline && pbi->lf_worker.data1 == NULL) {
     CHECK_MEM_ERROR(cm, pbi->lf_worker.data1, vpx_malloc(sizeof(LFWorkerData)));
     pbi->lf_worker.hook = (VP9WorkerHook)vp9_loop_filter_worker;
     if (pbi->oxcf.max_threads > 1 && !vp9_worker_reset(&pbi->lf_worker)) {
       vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
                          "Loop filter thread creation failed");
     }
   }
   alloc_tile_storage(pbi, tile_rows, tile_cols);
   xd->mode_info_stride = cm->mode_info_stride;
   set_prev_mi(cm);
   setup_plane_dequants(cm, xd, cm->base_qindex);
   setup_block_dptrs(xd, cm->subsampling_x, cm->subsampling_y);
   cm->fc = cm->frame_contexts[cm->frame_context_idx];
   vp9_zero(cm->counts);
   for (i = 0; i < MAX_MB_PLANE; ++i)
     vpx_memset(xd->plane[i].dqcoeff, 0, 64 * 64 * sizeof(int16_t));
   xd->corrupted = 0;
   new_fb->corrupted = read_compressed_header(pbi, data, first_partition_size);
   // TODO(jzern): remove frame_parallel_decoding_mode restriction for
   // single-frame tile decoding.
   if (pbi->oxcf.max_threads > 1 && tile_rows == 1 && tile_cols > 1 &&
       cm->frame_parallel_decoding_mode) {
     *p_data_end = decode_tiles_mt(pbi, data + first_partition_size);
   } else {
     *p_data_end = decode_tiles(pbi, data + first_partition_size);
   }
   cm->last_width = cm->width;
   cm->last_height = cm->height;
   new_fb->corrupted |= xd->corrupted;
   if (!pbi->decoded_key_frame) {
     if (keyframe && !new_fb->corrupted)
       pbi->decoded_key_frame = 1;
     else
       vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME,
                          "A stream must start with a complete key frame");
   }
   if (!cm->error_resilient_mode && !cm->frame_parallel_decoding_mode) {
     vp9_adapt_coef_probs(cm);
     if (!frame_is_intra_only(cm)) {
       vp9_adapt_mode_probs(cm);
       vp9_adapt_mv_probs(cm, cm->allow_high_precision_mv);
     }
   } else {
     debug_check_frame_counts(cm);
   }
   if (cm->refresh_frame_context)
     cm->frame_contexts[cm->frame_context_idx] = cm->fc;
   return 0;
 }

The Tor Browser / annotate

media/libvpx/vp9/decoder/vp9_decodframe.c@ac0c01689b40 (annotated)

media/libvpx/vp9/decoder/vp9_decodframe.c