vp8/decoder/decodframe.c

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 #include "vpx_config.h"
  13 #include "vpx_rtcd.h"
  14 #include "onyxd_int.h"
  15 #include "vp8/common/header.h"
  16 #include "vp8/common/reconintra4x4.h"
  17 #include "vp8/common/reconinter.h"
  18 #include "detokenize.h"
  19 #include "vp8/common/invtrans.h"
  20 #include "vp8/common/alloccommon.h"
  21 #include "vp8/common/entropymode.h"
  22 #include "vp8/common/quant_common.h"
  23 #include "vpx_scale/vpxscale.h"
  24 #include "vp8/common/setupintrarecon.h"
  25
  26 #include "decodemv.h"
  27 #include "vp8/common/extend.h"
  28 #if CONFIG_ERROR_CONCEALMENT
  29 #include "error_concealment.h"
  30 #endif
  31 #include "vpx_mem/vpx_mem.h"
  32 #include "vp8/common/threading.h"
  33 #include "decoderthreading.h"
  34 #include "dboolhuff.h"
  35
  36 #include <assert.h>
  37 #include <stdio.h>
  38
  39 void vp8cx_init_de_quantizer(VP8D_COMP *pbi)
  40 {
  41     int Q;
  42     VP8_COMMON *const pc = & pbi->common;
  43
  44     for (Q = 0; Q < QINDEX_RANGE; Q++)
  45     {
  46         pc->Y1dequant[Q][0] = (short)vp8_dc_quant(Q, pc->y1dc_delta_q);
  47         pc->Y2dequant[Q][0] = (short)vp8_dc2quant(Q, pc->y2dc_delta_q);
  48         pc->UVdequant[Q][0] = (short)vp8_dc_uv_quant(Q, pc->uvdc_delta_q);
  49
  50         pc->Y1dequant[Q][1] = (short)vp8_ac_yquant(Q);
  51         pc->Y2dequant[Q][1] = (short)vp8_ac2quant(Q, pc->y2ac_delta_q);
  52         pc->UVdequant[Q][1] = (short)vp8_ac_uv_quant(Q, pc->uvac_delta_q);
  53     }
  54 }
  55
  56 void vp8_mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
  57 {
  58     int i;
  59     int QIndex;
  60     MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
  61     VP8_COMMON *const pc = & pbi->common;
  62
  63     /* Decide whether to use the default or alternate baseline Q value. */
  64     if (xd->segmentation_enabled)
  65     {
  66         /* Abs Value */
  67         if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
  68             QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
  69
  70         /* Delta Value */
  71         else
  72         {
  73             QIndex = pc->base_qindex + xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
  74             QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0;    /* Clamp to valid range */
  75         }
  76     }
  77     else
  78         QIndex = pc->base_qindex;
  79
  80     /* Set up the macroblock dequant constants */
  81     xd->dequant_y1_dc[0] = 1;
  82     xd->dequant_y1[0] = pc->Y1dequant[QIndex][0];
  83     xd->dequant_y2[0] = pc->Y2dequant[QIndex][0];
  84     xd->dequant_uv[0] = pc->UVdequant[QIndex][0];
  85
  86     for (i = 1; i < 16; i++)
  87     {
  88         xd->dequant_y1_dc[i] =
  89         xd->dequant_y1[i] = pc->Y1dequant[QIndex][1];
  90         xd->dequant_y2[i] = pc->Y2dequant[QIndex][1];
  91         xd->dequant_uv[i] = pc->UVdequant[QIndex][1];
  92     }
  93 }
  94
  95 static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
  96                               unsigned int mb_idx)
  97 {
  98     MB_PREDICTION_MODE mode;
  99     int i;
 100 #if CONFIG_ERROR_CONCEALMENT
 101     int corruption_detected = 0;
 102 #endif
 103
 104     if (xd->mode_info_context->mbmi.mb_skip_coeff)
 105     {
 106         vp8_reset_mb_tokens_context(xd);
 107     }
 108     else if (!vp8dx_bool_error(xd->current_bc))
 109     {
 110         int eobtotal;
 111         eobtotal = vp8_decode_mb_tokens(pbi, xd);
 112
 113         /* Special case:  Force the loopfilter to skip when eobtotal is zero */
 114         xd->mode_info_context->mbmi.mb_skip_coeff = (eobtotal==0);
 115     }
 116
 117     mode = xd->mode_info_context->mbmi.mode;
 118
 119     if (xd->segmentation_enabled)
 120         vp8_mb_init_dequantizer(pbi, xd);
 121
 122
 123 #if CONFIG_ERROR_CONCEALMENT
 124
 125     if(pbi->ec_active)
 126     {
 127         int throw_residual;
 128         /* When we have independent partitions we can apply residual even
 129          * though other partitions within the frame are corrupt.
 130          */
 131         throw_residual = (!pbi->independent_partitions &&
 132                           pbi->frame_corrupt_residual);
 133         throw_residual = (throw_residual || vp8dx_bool_error(xd->current_bc));
 134
 135         if ((mb_idx >= pbi->mvs_corrupt_from_mb || throw_residual))
 136         {
 137             /* MB with corrupt residuals or corrupt mode/motion vectors.
 138              * Better to use the predictor as reconstruction.
 139              */
 140             pbi->frame_corrupt_residual = 1;
 141             vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
 142             vp8_conceal_corrupt_mb(xd);
 143
 144
 145             corruption_detected = 1;
 146
 147             /* force idct to be skipped for B_PRED and use the
 148              * prediction only for reconstruction
 149              * */
 150             vpx_memset(xd->eobs, 0, 25);
 151         }
 152     }
 153 #endif
 154
 155     /* do prediction */
 156     if (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME)
 157     {
 158         vp8_build_intra_predictors_mbuv_s(xd,
 159                                           xd->recon_above[1],
 160                                           xd->recon_above[2],
 161                                           xd->recon_left[1],
 162                                           xd->recon_left[2],
 163                                           xd->recon_left_stride[1],
 164                                           xd->dst.u_buffer, xd->dst.v_buffer,
 165                                           xd->dst.uv_stride);
 166
 167         if (mode != B_PRED)
 168         {
 169             vp8_build_intra_predictors_mby_s(xd,
 170                                                  xd->recon_above[0],
 171                                                  xd->recon_left[0],
 172                                                  xd->recon_left_stride[0],
 173                                                  xd->dst.y_buffer,
 174                                                  xd->dst.y_stride);
 175         }
 176         else
 177         {
 178             short *DQC = xd->dequant_y1;
 179             int dst_stride = xd->dst.y_stride;
 180             unsigned char *base_dst = xd->dst.y_buffer;
 181
 182             /* clear out residual eob info */
 183             if(xd->mode_info_context->mbmi.mb_skip_coeff)
 184                 vpx_memset(xd->eobs, 0, 25);
 185
 186             intra_prediction_down_copy(xd, xd->recon_above[0] + 16);
 187
 188             for (i = 0; i < 16; i++)
 189             {
 190                 BLOCKD *b = &xd->block[i];
 191                 int b_mode = xd->mode_info_context->bmi[i].as_mode;
 192                 unsigned char *yabove;
 193                 unsigned char *yleft;
 194                 int left_stride;
 195                 unsigned char top_left;
 196
 197                 yabove = base_dst + b->offset - dst_stride;
 198                 yleft = base_dst + b->offset - 1;
 199                 left_stride = dst_stride;
 200                 top_left = yabove[-1];
 201
 202                 //                vp8_intra4x4_predict (base_dst + b->offset, dst_stride, b_mode,
 203                   //                                    base_dst + b->offset, dst_stride );
 204                 vp8_intra4x4_predict_d_c(yabove, yleft, left_stride,
 205                                        b_mode,
 206                                        base_dst + b->offset, dst_stride,
 207                                        top_left);
 208
 209                 if (xd->eobs[i])
 210                 {
 211                     if (xd->eobs[i] > 1)
 212                     {
 213                     vp8_dequant_idct_add
 214                             (b->qcoeff, DQC,
 215                                 base_dst + b->offset, dst_stride);
 216                     }
 217                     else
 218                     {
 219                         vp8_dc_only_idct_add
 220                             (b->qcoeff[0] * DQC[0],
 221                                 base_dst + b->offset, dst_stride,
 222                                 base_dst + b->offset, dst_stride);
 223                         ((int *)b->qcoeff)[0] = 0;
 224                     }
 225                 }
 226             }
 227         }
 228     }
 229     else
 230     {
 231         vp8_build_inter_predictors_mb(xd);
 232     }
 233
 234
 235 #if CONFIG_ERROR_CONCEALMENT
 236     if (corruption_detected)
 237     {
 238         return;
 239     }
 240 #endif
 241
 242     if(!xd->mode_info_context->mbmi.mb_skip_coeff)
 243     {
 244         /* dequantization and idct */
 245         if (mode != B_PRED)
 246         {
 247             short *DQC = xd->dequant_y1;
 248
 249             if (mode != SPLITMV)
 250             {
 251                 BLOCKD *b = &xd->block[24];
 252
 253                 /* do 2nd order transform on the dc block */
 254                 if (xd->eobs[24] > 1)
 255                 {
 256                     vp8_dequantize_b(b, xd->dequant_y2);
 257
 258                     vp8_short_inv_walsh4x4(&b->dqcoeff[0],
 259                         xd->qcoeff);
 260                     ((int *)b->qcoeff)[0] = 0;
 261                     ((int *)b->qcoeff)[1] = 0;
 262                     ((int *)b->qcoeff)[2] = 0;
 263                     ((int *)b->qcoeff)[3] = 0;
 264                     ((int *)b->qcoeff)[4] = 0;
 265                     ((int *)b->qcoeff)[5] = 0;
 266                     ((int *)b->qcoeff)[6] = 0;
 267                     ((int *)b->qcoeff)[7] = 0;
 268                 }
 269                 else
 270                 {
 271                     b->dqcoeff[0] = b->qcoeff[0] * xd->dequant_y2[0];
 272                     vp8_short_inv_walsh4x4_1(&b->dqcoeff[0],
 273                         xd->qcoeff);
 274                     ((int *)b->qcoeff)[0] = 0;
 275                 }
 276
 277                 /* override the dc dequant constant in order to preserve the
 278                  * dc components
 279                  */
 280                 DQC = xd->dequant_y1_dc;
 281             }
 282
 283             vp8_dequant_idct_add_y_block
 284                             (xd->qcoeff, DQC,
 285                              xd->dst.y_buffer,
 286                              xd->dst.y_stride, xd->eobs);
 287         }
 288
 289         vp8_dequant_idct_add_uv_block
 290                         (xd->qcoeff+16*16, xd->dequant_uv,
 291                          xd->dst.u_buffer, xd->dst.v_buffer,
 292                          xd->dst.uv_stride, xd->eobs+16);
 293     }
 294 }
 295
 296 static int get_delta_q(vp8_reader *bc, int prev, int *q_update)
 297 {
 298     int ret_val = 0;
 299
 300     if (vp8_read_bit(bc))
 301     {
 302         ret_val = vp8_read_literal(bc, 4);
 303
 304         if (vp8_read_bit(bc))
 305             ret_val = -ret_val;
 306     }
 307
 308     /* Trigger a quantizer update if the delta-q value has changed */
 309     if (ret_val != prev)
 310         *q_update = 1;
 311
 312     return ret_val;
 313 }
 314
 315 #ifdef PACKET_TESTING
 316 #include <stdio.h>
 317 FILE *vpxlog = 0;
 318 #endif
 319
 320 static void decode_mb_rows(VP8D_COMP *pbi)
 321 {
 322     VP8_COMMON *const pc = & pbi->common;
 323     MACROBLOCKD *const xd  = & pbi->mb;
 324
 325     int ibc = 0;
 326     int num_part = 1 << pc->multi_token_partition;
 327
 328     int recon_yoffset, recon_uvoffset;
 329     int mb_row, mb_col;
 330     int mb_idx = 0;
 331     int dst_fb_idx = pc->new_fb_idx;
 332     int recon_y_stride = pc->yv12_fb[dst_fb_idx].y_stride;
 333     int recon_uv_stride = pc->yv12_fb[dst_fb_idx].uv_stride;
 334
 335     unsigned char *ref_buffer[MAX_REF_FRAMES][3];
 336     unsigned char *dst_buffer[3];
 337     int i;
 338     int ref_fb_index[MAX_REF_FRAMES];
 339     int ref_fb_corrupted[MAX_REF_FRAMES];
 340
 341     ref_fb_corrupted[INTRA_FRAME] = 0;
 342
 343     ref_fb_index[LAST_FRAME]    = pc->lst_fb_idx;
 344     ref_fb_index[GOLDEN_FRAME]  = pc->gld_fb_idx;
 345     ref_fb_index[ALTREF_FRAME]  = pc->alt_fb_idx;
 346
 347     for(i = 1; i < MAX_REF_FRAMES; i++)
 348     {
 349         ref_buffer[i][0] = pc->yv12_fb[ref_fb_index[i]].y_buffer;
 350         ref_buffer[i][1] = pc->yv12_fb[ref_fb_index[i]].u_buffer;
 351         ref_buffer[i][2] = pc->yv12_fb[ref_fb_index[i]].v_buffer;
 352
 353         ref_fb_corrupted[i] = pc->yv12_fb[ref_fb_index[i]].corrupted;
 354     }
 355
 356     dst_buffer[0] = pc->yv12_fb[dst_fb_idx].y_buffer;
 357     dst_buffer[1] = pc->yv12_fb[dst_fb_idx].u_buffer;
 358     dst_buffer[2] = pc->yv12_fb[dst_fb_idx].v_buffer;
 359
 360     xd->up_available = 0;
 361
 362     /* Decode the individual macro block */
 363     for (mb_row = 0; mb_row < pc->mb_rows; mb_row++)
 364     {
 365         if (num_part > 1)
 366         {
 367             xd->current_bc = & pbi->mbc[ibc];
 368             ibc++;
 369
 370             if (ibc == num_part)
 371                 ibc = 0;
 372         }
 373
 374         recon_yoffset = mb_row * recon_y_stride * 16;
 375         recon_uvoffset = mb_row * recon_uv_stride * 8;
 376
 377         /* reset contexts */
 378         xd->above_context = pc->above_context;
 379         vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
 380
 381         xd->left_available = 0;
 382
 383         xd->mb_to_top_edge = -((mb_row * 16)) << 3;
 384         xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
 385
 386         xd->recon_above[0] = dst_buffer[0] + recon_yoffset;
 387         xd->recon_above[1] = dst_buffer[1] + recon_uvoffset;
 388         xd->recon_above[2] = dst_buffer[2] + recon_uvoffset;
 389
 390         xd->recon_left[0] = xd->recon_above[0] - 1;
 391         xd->recon_left[1] = xd->recon_above[1] - 1;
 392         xd->recon_left[2] = xd->recon_above[2] - 1;
 393
 394         xd->recon_above[0] -= xd->dst.y_stride;
 395         xd->recon_above[1] -= xd->dst.uv_stride;
 396         xd->recon_above[2] -= xd->dst.uv_stride;
 397
 398         //TODO: move to outside row loop
 399         xd->recon_left_stride[0] = xd->dst.y_stride;
 400         xd->recon_left_stride[1] = xd->dst.uv_stride;
 401
 402         for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
 403         {
 404             /* Distance of Mb to the various image edges.
 405              * These are specified to 8th pel as they are always compared to values
 406              * that are in 1/8th pel units
 407              */
 408             xd->mb_to_left_edge = -((mb_col * 16) << 3);
 409             xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
 410
 411 #if CONFIG_ERROR_CONCEALMENT
 412             {
 413                 int corrupt_residual = (!pbi->independent_partitions &&
 414                                        pbi->frame_corrupt_residual) ||
 415                                        vp8dx_bool_error(xd->current_bc);
 416                 if (pbi->ec_active &&
 417                     xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME &&
 418                     corrupt_residual)
 419                 {
 420                     /* We have an intra block with corrupt coefficients, better to
 421                      * conceal with an inter block. Interpolate MVs from neighboring
 422                      * MBs.
 423                      *
 424                      * Note that for the first mb with corrupt residual in a frame,
 425                      * we might not discover that before decoding the residual. That
 426                      * happens after this check, and therefore no inter concealment
 427                      * will be done.
 428                      */
 429                     vp8_interpolate_motion(xd,
 430                                            mb_row, mb_col,
 431                                            pc->mb_rows, pc->mb_cols,
 432                                            pc->mode_info_stride);
 433                 }
 434             }
 435 #endif
 436
 437             xd->dst.y_buffer = dst_buffer[0] + recon_yoffset;
 438             xd->dst.u_buffer = dst_buffer[1] + recon_uvoffset;
 439             xd->dst.v_buffer = dst_buffer[2] + recon_uvoffset;
 440
 441             xd->pre.y_buffer = ref_buffer[xd->mode_info_context->mbmi.ref_frame][0] + recon_yoffset;
 442             xd->pre.u_buffer = ref_buffer[xd->mode_info_context->mbmi.ref_frame][1] + recon_uvoffset;
 443             xd->pre.v_buffer = ref_buffer[xd->mode_info_context->mbmi.ref_frame][2] + recon_uvoffset;
 444
 445             /* propagate errors from reference frames */
 446             xd->corrupted |= ref_fb_corrupted[xd->mode_info_context->mbmi.ref_frame];
 447
 448             decode_macroblock(pbi, xd, mb_idx);
 449
 450             mb_idx++;
 451             xd->left_available = 1;
 452
 453             /* check if the boolean decoder has suffered an error */
 454             xd->corrupted |= vp8dx_bool_error(xd->current_bc);
 455
 456             xd->recon_above[0] += 16;
 457             xd->recon_above[1] += 8;
 458             xd->recon_above[2] += 8;
 459             xd->recon_left[0] += 16;
 460             xd->recon_left[1] += 8;
 461             xd->recon_left[2] += 8;
 462
 463
 464             recon_yoffset += 16;
 465             recon_uvoffset += 8;
 466
 467             ++xd->mode_info_context;  /* next mb */
 468
 469             xd->above_context++;
 470
 471         }
 472
 473         /* adjust to the next row of mbs */
 474         vp8_extend_mb_row(
 475             &pc->yv12_fb[dst_fb_idx],
 476             xd->dst.y_buffer + 16, xd->dst.u_buffer + 8, xd->dst.v_buffer + 8
 477         );
 478
 479         ++xd->mode_info_context;      /* skip prediction column */
 480         xd->up_available = 1;
 481
 482     }
 483 }
 484
 485 static unsigned int read_partition_size(const unsigned char *cx_size)
 486 {
 487     const unsigned int size =
 488         cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);
 489     return size;
 490 }
 491
 492 static int read_is_valid(const unsigned char *start,
 493                          size_t               len,
 494                          const unsigned char *end)
 495 {
 496     return (start + len > start && start + len <= end);
 497 }
 498
 499 static unsigned int read_available_partition_size(
 500                                        VP8D_COMP *pbi,
 501                                        const unsigned char *token_part_sizes,
 502                                        const unsigned char *fragment_start,
 503                                        const unsigned char *first_fragment_end,
 504                                        const unsigned char *fragment_end,
 505                                        int i,
 506                                        int num_part)
 507 {
 508     VP8_COMMON* pc = &pbi->common;
 509     const unsigned char *partition_size_ptr = token_part_sizes + i * 3;
 510     unsigned int partition_size = 0;
 511     ptrdiff_t bytes_left = fragment_end - fragment_start;
 512     /* Calculate the length of this partition. The last partition
 513      * size is implicit. If the partition size can't be read, then
 514      * either use the remaining data in the buffer (for EC mode)
 515      * or throw an error.
 516      */
 517     if (i < num_part - 1)
 518     {
 519         if (read_is_valid(partition_size_ptr, 3, first_fragment_end))
 520             partition_size = read_partition_size(partition_size_ptr);
 521         else if (pbi->ec_active)
 522             partition_size = bytes_left;
 523         else
 524             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 525                                "Truncated partition size data");
 526     }
 527     else
 528         partition_size = bytes_left;
 529
 530     /* Validate the calculated partition length. If the buffer
 531      * described by the partition can't be fully read, then restrict
 532      * it to the portion that can be (for EC mode) or throw an error.
 533      */
 534     if (!read_is_valid(fragment_start, partition_size, fragment_end))
 535     {
 536         if (pbi->ec_active)
 537             partition_size = bytes_left;
 538         else
 539             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 540                                "Truncated packet or corrupt partition "
 541                                "%d length", i + 1);
 542     }
 543     return partition_size;
 544 }
 545
 546
 547 static void setup_token_decoder(VP8D_COMP *pbi,
 548                                 const unsigned char* token_part_sizes)
 549 {
 550     vp8_reader *bool_decoder = &pbi->bc2;
 551     unsigned int partition_idx;
 552     int fragment_idx;
 553     int num_token_partitions;
 554     const unsigned char *first_fragment_end = pbi->fragments[0] +
 555                                           pbi->fragment_sizes[0];
 556
 557     TOKEN_PARTITION multi_token_partition =
 558             (TOKEN_PARTITION)vp8_read_literal(&pbi->bc, 2);
 559     if (!vp8dx_bool_error(&pbi->bc))
 560         pbi->common.multi_token_partition = multi_token_partition;
 561     num_token_partitions = 1 << pbi->common.multi_token_partition;
 562     if (num_token_partitions > 1)
 563     {
 564         CHECK_MEM_ERROR(pbi->mbc, vpx_malloc(num_token_partitions *
 565                                              sizeof(vp8_reader)));
 566         bool_decoder = pbi->mbc;
 567     }
 568
 569     /* Check for partitions within the fragments and unpack the fragments
 570      * so that each fragment pointer points to its corresponding partition. */
 571     for (fragment_idx = 0; fragment_idx < pbi->num_fragments; ++fragment_idx)
 572     {
 573         unsigned int fragment_size = pbi->fragment_sizes[fragment_idx];
 574         const unsigned char *fragment_end = pbi->fragments[fragment_idx] +
 575                                             fragment_size;
 576         /* Special case for handling the first partition since we have already
 577          * read its size. */
 578         if (fragment_idx == 0)
 579         {
 580             /* Size of first partition + token partition sizes element */
 581             ptrdiff_t ext_first_part_size = token_part_sizes -
 582                 pbi->fragments[0] + 3 * (num_token_partitions - 1);
 583             fragment_size -= ext_first_part_size;
 584             if (fragment_size > 0)
 585             {
 586                 pbi->fragment_sizes[0] = ext_first_part_size;
 587                 /* The fragment contains an additional partition. Move to
 588                  * next. */
 589                 fragment_idx++;
 590                 pbi->fragments[fragment_idx] = pbi->fragments[0] +
 591                   pbi->fragment_sizes[0];
 592             }
 593         }
 594         /* Split the chunk into partitions read from the bitstream */
 595         while (fragment_size > 0)
 596         {
 597             ptrdiff_t partition_size = read_available_partition_size(
 598                                                  pbi,
 599                                                  token_part_sizes,
 600                                                  pbi->fragments[fragment_idx],
 601                                                  first_fragment_end,
 602                                                  fragment_end,
 603                                                  fragment_idx - 1,
 604                                                  num_token_partitions);
 605             pbi->fragment_sizes[fragment_idx] = partition_size;
 606             fragment_size -= partition_size;
 607             assert(fragment_idx <= num_token_partitions);
 608             if (fragment_size > 0)
 609             {
 610                 /* The fragment contains an additional partition.
 611                  * Move to next. */
 612                 fragment_idx++;
 613                 pbi->fragments[fragment_idx] =
 614                     pbi->fragments[fragment_idx - 1] + partition_size;
 615             }
 616         }
 617     }
 618
 619     pbi->num_fragments = num_token_partitions + 1;
 620
 621     for (partition_idx = 1; partition_idx < pbi->num_fragments; ++partition_idx)
 622     {
 623         if (vp8dx_start_decode(bool_decoder,
 624                                pbi->fragments[partition_idx],
 625                                pbi->fragment_sizes[partition_idx]))
 626             vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,
 627                                "Failed to allocate bool decoder %d",
 628                                partition_idx);
 629
 630         bool_decoder++;
 631     }
 632
 633 #if CONFIG_MULTITHREAD
 634     /* Clamp number of decoder threads */
 635     if (pbi->decoding_thread_count > num_token_partitions - 1)
 636         pbi->decoding_thread_count = num_token_partitions - 1;
 637 #endif
 638 }
 639
 640 static void stop_token_decoder(VP8D_COMP *pbi)
 641 {
 642     VP8_COMMON *pc = &pbi->common;
 643
 644     if (pc->multi_token_partition != ONE_PARTITION)
 645     {
 646         vpx_free(pbi->mbc);
 647         pbi->mbc = NULL;
 648     }
 649 }
 650
 651 static void init_frame(VP8D_COMP *pbi)
 652 {
 653     VP8_COMMON *const pc = & pbi->common;
 654     MACROBLOCKD *const xd  = & pbi->mb;
 655
 656     if (pc->frame_type == KEY_FRAME)
 657     {
 658         /* Various keyframe initializations */
 659         vpx_memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
 660
 661         vp8_init_mbmode_probs(pc);
 662
 663         vp8_default_coef_probs(pc);
 664         vp8_kf_default_bmode_probs(pc->kf_bmode_prob);
 665
 666         /* reset the segment feature data to 0 with delta coding (Default state). */
 667         vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
 668         xd->mb_segement_abs_delta = SEGMENT_DELTADATA;
 669
 670         /* reset the mode ref deltasa for loop filter */
 671         vpx_memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));
 672         vpx_memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));
 673
 674         /* All buffers are implicitly updated on key frames. */
 675         pc->refresh_golden_frame = 1;
 676         pc->refresh_alt_ref_frame = 1;
 677         pc->copy_buffer_to_gf = 0;
 678         pc->copy_buffer_to_arf = 0;
 679
 680         /* Note that Golden and Altref modes cannot be used on a key frame so
 681          * ref_frame_sign_bias[] is undefined and meaningless
 682          */
 683         pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;
 684         pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;
 685     }
 686     else
 687     {
 688         if (!pc->use_bilinear_mc_filter)
 689             pc->mcomp_filter_type = SIXTAP;
 690         else
 691             pc->mcomp_filter_type = BILINEAR;
 692
 693         /* To enable choice of different interploation filters */
 694         if (pc->mcomp_filter_type == SIXTAP)
 695         {
 696             xd->subpixel_predict        = vp8_sixtap_predict4x4;
 697             xd->subpixel_predict8x4     = vp8_sixtap_predict8x4;
 698             xd->subpixel_predict8x8     = vp8_sixtap_predict8x8;
 699             xd->subpixel_predict16x16   = vp8_sixtap_predict16x16;
 700         }
 701         else
 702         {
 703             xd->subpixel_predict        = vp8_bilinear_predict4x4;
 704             xd->subpixel_predict8x4     = vp8_bilinear_predict8x4;
 705             xd->subpixel_predict8x8     = vp8_bilinear_predict8x8;
 706             xd->subpixel_predict16x16   = vp8_bilinear_predict16x16;
 707         }
 708
 709         if (pbi->decoded_key_frame && pbi->ec_enabled && !pbi->ec_active)
 710             pbi->ec_active = 1;
 711     }
 712
 713     xd->left_context = &pc->left_context;
 714     xd->mode_info_context = pc->mi;
 715     xd->frame_type = pc->frame_type;
 716     xd->mode_info_context->mbmi.mode = DC_PRED;
 717     xd->mode_info_stride = pc->mode_info_stride;
 718     xd->corrupted = 0; /* init without corruption */
 719
 720     xd->fullpixel_mask = 0xffffffff;
 721     if(pc->full_pixel)
 722         xd->fullpixel_mask = 0xfffffff8;
 723
 724 }
 725
 726 int vp8_decode_frame(VP8D_COMP *pbi)
 727 {
 728     vp8_reader *const bc = & pbi->bc;
 729     VP8_COMMON *const pc = & pbi->common;
 730     MACROBLOCKD *const xd  = & pbi->mb;
 731     const unsigned char *data = pbi->fragments[0];
 732     const unsigned char *data_end =  data + pbi->fragment_sizes[0];
 733     ptrdiff_t first_partition_length_in_bytes;
 734
 735     int i, j, k, l;
 736     const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;
 737     int corrupt_tokens = 0;
 738     int prev_independent_partitions = pbi->independent_partitions;
 739
 740     /* start with no corruption of current frame */
 741     xd->corrupted = 0;
 742     pc->yv12_fb[pc->new_fb_idx].corrupted = 0;
 743
 744     if (data_end - data < 3)
 745     {
 746         if (!pbi->ec_active)
 747         {
 748             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 749                                "Truncated packet");
 750         }
 751
 752         /* Declare the missing frame as an inter frame since it will
 753            be handled as an inter frame when we have estimated its
 754            motion vectors. */
 755         pc->frame_type = INTER_FRAME;
 756         pc->version = 0;
 757         pc->show_frame = 1;
 758         first_partition_length_in_bytes = 0;
 759     }
 760     else
 761     {
 762         pc->frame_type = (FRAME_TYPE)(data[0] & 1);
 763         pc->version = (data[0] >> 1) & 7;
 764         pc->show_frame = (data[0] >> 4) & 1;
 765         first_partition_length_in_bytes =
 766             (data[0] | (data[1] << 8) | (data[2] << 16)) >> 5;
 767
 768         if (!pbi->ec_active && (data + first_partition_length_in_bytes > data_end
 769             || data + first_partition_length_in_bytes < data))
 770             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 771                                "Truncated packet or corrupt partition 0 length");
 772
 773         data += 3;
 774
 775         vp8_setup_version(pc);
 776
 777         if (pc->frame_type == KEY_FRAME)
 778         {
 779             const int Width = pc->Width;
 780             const int Height = pc->Height;
 781
 782             /* vet via sync code */
 783             /* When error concealment is enabled we should only check the sync
 784              * code if we have enough bits available
 785              */
 786             if (!pbi->ec_active || data + 3 < data_end)
 787             {
 788                 if (data[0] != 0x9d || data[1] != 0x01 || data[2] != 0x2a)
 789                     vpx_internal_error(&pc->error, VPX_CODEC_UNSUP_BITSTREAM,
 790                                    "Invalid frame sync code");
 791             }
 792
 793             /* If error concealment is enabled we should only parse the new size
 794              * if we have enough data. Otherwise we will end up with the wrong
 795              * size.
 796              */
 797             if (!pbi->ec_active || data + 6 < data_end)
 798             {
 799                 pc->Width = (data[3] | (data[4] << 8)) & 0x3fff;
 800                 pc->horiz_scale = data[4] >> 6;
 801                 pc->Height = (data[5] | (data[6] << 8)) & 0x3fff;
 802                 pc->vert_scale = data[6] >> 6;
 803             }
 804             data += 7;
 805
 806             if (Width != pc->Width  ||  Height != pc->Height)
 807             {
 808                 int prev_mb_rows = pc->mb_rows;
 809
 810                 if (pc->Width <= 0)
 811                 {
 812                     pc->Width = Width;
 813                     vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 814                                        "Invalid frame width");
 815                 }
 816
 817                 if (pc->Height <= 0)
 818                 {
 819                     pc->Height = Height;
 820                     vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 821                                        "Invalid frame height");
 822                 }
 823
 824                 if (vp8_alloc_frame_buffers(pc, pc->Width, pc->Height))
 825                     vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
 826                                        "Failed to allocate frame buffers");
 827
 828 #if CONFIG_ERROR_CONCEALMENT
 829                 pbi->overlaps = NULL;
 830                 if (pbi->ec_enabled)
 831                 {
 832                     if (vp8_alloc_overlap_lists(pbi))
 833                         vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
 834                                            "Failed to allocate overlap lists "
 835                                            "for error concealment");
 836                 }
 837 #endif
 838
 839 #if CONFIG_MULTITHREAD
 840                 if (pbi->b_multithreaded_rd)
 841                     vp8mt_alloc_temp_buffers(pbi, pc->Width, prev_mb_rows);
 842 #endif
 843             }
 844         }
 845     }
 846
 847     if ((!pbi->decoded_key_frame && pc->frame_type != KEY_FRAME) ||
 848         pc->Width == 0 || pc->Height == 0)
 849     {
 850         return -1;
 851     }
 852
 853     init_frame(pbi);
 854
 855     if (vp8dx_start_decode(bc, data, data_end - data))
 856         vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
 857                            "Failed to allocate bool decoder 0");
 858     if (pc->frame_type == KEY_FRAME) {
 859         pc->clr_type    = (YUV_TYPE)vp8_read_bit(bc);
 860         pc->clamp_type  = (CLAMP_TYPE)vp8_read_bit(bc);
 861     }
 862
 863     /* Is segmentation enabled */
 864     xd->segmentation_enabled = (unsigned char)vp8_read_bit(bc);
 865
 866     if (xd->segmentation_enabled)
 867     {
 868         /* Signal whether or not the segmentation map is being explicitly updated this frame. */
 869         xd->update_mb_segmentation_map = (unsigned char)vp8_read_bit(bc);
 870         xd->update_mb_segmentation_data = (unsigned char)vp8_read_bit(bc);
 871
 872         if (xd->update_mb_segmentation_data)
 873         {
 874             xd->mb_segement_abs_delta = (unsigned char)vp8_read_bit(bc);
 875
 876             vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
 877
 878             /* For each segmentation feature (Quant and loop filter level) */
 879             for (i = 0; i < MB_LVL_MAX; i++)
 880             {
 881                 for (j = 0; j < MAX_MB_SEGMENTS; j++)
 882                 {
 883                     /* Frame level data */
 884                     if (vp8_read_bit(bc))
 885                     {
 886                         xd->segment_feature_data[i][j] = (signed char)vp8_read_literal(bc, mb_feature_data_bits[i]);
 887
 888                         if (vp8_read_bit(bc))
 889                             xd->segment_feature_data[i][j] = -xd->segment_feature_data[i][j];
 890                     }
 891                     else
 892                         xd->segment_feature_data[i][j] = 0;
 893                 }
 894             }
 895         }
 896
 897         if (xd->update_mb_segmentation_map)
 898         {
 899             /* Which macro block level features are enabled */
 900             vpx_memset(xd->mb_segment_tree_probs, 255, sizeof(xd->mb_segment_tree_probs));
 901
 902             /* Read the probs used to decode the segment id for each macro block. */
 903             for (i = 0; i < MB_FEATURE_TREE_PROBS; i++)
 904             {
 905                 /* If not explicitly set value is defaulted to 255 by memset above */
 906                 if (vp8_read_bit(bc))
 907                     xd->mb_segment_tree_probs[i] = (vp8_prob)vp8_read_literal(bc, 8);
 908             }
 909         }
 910     }
 911     else
 912     {
 913         /* No segmentation updates on this frame */
 914         xd->update_mb_segmentation_map = 0;
 915         xd->update_mb_segmentation_data = 0;
 916     }
 917
 918     /* Read the loop filter level and type */
 919     pc->filter_type = (LOOPFILTERTYPE) vp8_read_bit(bc);
 920     pc->filter_level = vp8_read_literal(bc, 6);
 921     pc->sharpness_level = vp8_read_literal(bc, 3);
 922
 923     /* Read in loop filter deltas applied at the MB level based on mode or ref frame. */
 924     xd->mode_ref_lf_delta_update = 0;
 925     xd->mode_ref_lf_delta_enabled = (unsigned char)vp8_read_bit(bc);
 926
 927     if (xd->mode_ref_lf_delta_enabled)
 928     {
 929         /* Do the deltas need to be updated */
 930         xd->mode_ref_lf_delta_update = (unsigned char)vp8_read_bit(bc);
 931
 932         if (xd->mode_ref_lf_delta_update)
 933         {
 934             /* Send update */
 935             for (i = 0; i < MAX_REF_LF_DELTAS; i++)
 936             {
 937                 if (vp8_read_bit(bc))
 938                 {
 939                     /*sign = vp8_read_bit( bc );*/
 940                     xd->ref_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
 941
 942                     if (vp8_read_bit(bc))        /* Apply sign */
 943                         xd->ref_lf_deltas[i] = xd->ref_lf_deltas[i] * -1;
 944                 }
 945             }
 946
 947             /* Send update */
 948             for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
 949             {
 950                 if (vp8_read_bit(bc))
 951                 {
 952                     /*sign = vp8_read_bit( bc );*/
 953                     xd->mode_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
 954
 955                     if (vp8_read_bit(bc))        /* Apply sign */
 956                         xd->mode_lf_deltas[i] = xd->mode_lf_deltas[i] * -1;
 957                 }
 958             }
 959         }
 960     }
 961
 962     setup_token_decoder(pbi, data + first_partition_length_in_bytes);
 963
 964     xd->current_bc = &pbi->bc2;
 965
 966     /* Read the default quantizers. */
 967     {
 968         int Q, q_update;
 969
 970         Q = vp8_read_literal(bc, 7);  /* AC 1st order Q = default */
 971         pc->base_qindex = Q;
 972         q_update = 0;
 973         pc->y1dc_delta_q = get_delta_q(bc, pc->y1dc_delta_q, &q_update);
 974         pc->y2dc_delta_q = get_delta_q(bc, pc->y2dc_delta_q, &q_update);
 975         pc->y2ac_delta_q = get_delta_q(bc, pc->y2ac_delta_q, &q_update);
 976         pc->uvdc_delta_q = get_delta_q(bc, pc->uvdc_delta_q, &q_update);
 977         pc->uvac_delta_q = get_delta_q(bc, pc->uvac_delta_q, &q_update);
 978
 979         if (q_update)
 980             vp8cx_init_de_quantizer(pbi);
 981
 982         /* MB level dequantizer setup */
 983         vp8_mb_init_dequantizer(pbi, &pbi->mb);
 984     }
 985
 986     /* Determine if the golden frame or ARF buffer should be updated and how.
 987      * For all non key frames the GF and ARF refresh flags and sign bias
 988      * flags must be set explicitly.
 989      */
 990     if (pc->frame_type != KEY_FRAME)
 991     {
 992         /* Should the GF or ARF be updated from the current frame */
 993         pc->refresh_golden_frame = vp8_read_bit(bc);
 994 #if CONFIG_ERROR_CONCEALMENT
 995         /* Assume we shouldn't refresh golden if the bit is missing */
 996         xd->corrupted |= vp8dx_bool_error(bc);
 997         if (pbi->ec_active && xd->corrupted)
 998             pc->refresh_golden_frame = 0;
 999 #endif
1000
1001         pc->refresh_alt_ref_frame = vp8_read_bit(bc);
1002 #if CONFIG_ERROR_CONCEALMENT
1003         /* Assume we shouldn't refresh altref if the bit is missing */
1004         xd->corrupted |= vp8dx_bool_error(bc);
1005         if (pbi->ec_active && xd->corrupted)
1006             pc->refresh_alt_ref_frame = 0;
1007 #endif
1008
1009         /* Buffer to buffer copy flags. */
1010         pc->copy_buffer_to_gf = 0;
1011
1012         if (!pc->refresh_golden_frame)
1013             pc->copy_buffer_to_gf = vp8_read_literal(bc, 2);
1014
1015 #if CONFIG_ERROR_CONCEALMENT
1016         /* Assume we shouldn't copy to the golden if the bit is missing */
1017         xd->corrupted |= vp8dx_bool_error(bc);
1018         if (pbi->ec_active && xd->corrupted)
1019             pc->copy_buffer_to_gf = 0;
1020 #endif
1021
1022         pc->copy_buffer_to_arf = 0;
1023
1024         if (!pc->refresh_alt_ref_frame)
1025             pc->copy_buffer_to_arf = vp8_read_literal(bc, 2);
1026
1027 #if CONFIG_ERROR_CONCEALMENT
1028         /* Assume we shouldn't copy to the alt-ref if the bit is missing */
1029         xd->corrupted |= vp8dx_bool_error(bc);
1030         if (pbi->ec_active && xd->corrupted)
1031             pc->copy_buffer_to_arf = 0;
1032 #endif
1033
1034
1035         pc->ref_frame_sign_bias[GOLDEN_FRAME] = vp8_read_bit(bc);
1036         pc->ref_frame_sign_bias[ALTREF_FRAME] = vp8_read_bit(bc);
1037     }
1038
1039     pc->refresh_entropy_probs = vp8_read_bit(bc);
1040 #if CONFIG_ERROR_CONCEALMENT
1041     /* Assume we shouldn't refresh the probabilities if the bit is
1042      * missing */
1043     xd->corrupted |= vp8dx_bool_error(bc);
1044     if (pbi->ec_active && xd->corrupted)
1045         pc->refresh_entropy_probs = 0;
1046 #endif
1047     if (pc->refresh_entropy_probs == 0)
1048     {
1049         vpx_memcpy(&pc->lfc, &pc->fc, sizeof(pc->fc));
1050     }
1051
1052     pc->refresh_last_frame = pc->frame_type == KEY_FRAME  ||  vp8_read_bit(bc);
1053
1054 #if CONFIG_ERROR_CONCEALMENT
1055     /* Assume we should refresh the last frame if the bit is missing */
1056     xd->corrupted |= vp8dx_bool_error(bc);
1057     if (pbi->ec_active && xd->corrupted)
1058         pc->refresh_last_frame = 1;
1059 #endif
1060
1061     if (0)
1062     {
1063         FILE *z = fopen("decodestats.stt", "a");
1064         fprintf(z, "%6d F:%d,G:%d,A:%d,L:%d,Q:%d\n",
1065                 pc->current_video_frame,
1066                 pc->frame_type,
1067                 pc->refresh_golden_frame,
1068                 pc->refresh_alt_ref_frame,
1069                 pc->refresh_last_frame,
1070                 pc->base_qindex);
1071         fclose(z);
1072     }
1073
1074     {
1075         pbi->independent_partitions = 1;
1076
1077         /* read coef probability tree */
1078         for (i = 0; i < BLOCK_TYPES; i++)
1079             for (j = 0; j < COEF_BANDS; j++)
1080                 for (k = 0; k < PREV_COEF_CONTEXTS; k++)
1081                     for (l = 0; l < ENTROPY_NODES; l++)
1082                     {
1083
1084                         vp8_prob *const p = pc->fc.coef_probs [i][j][k] + l;
1085
1086                         if (vp8_read(bc, vp8_coef_update_probs [i][j][k][l]))
1087                         {
1088                             *p = (vp8_prob)vp8_read_literal(bc, 8);
1089
1090                         }
1091                         if (k > 0 && *p != pc->fc.coef_probs[i][j][k-1][l])
1092                             pbi->independent_partitions = 0;
1093
1094                     }
1095     }
1096
1097     vpx_memcpy(&xd->pre, &pc->yv12_fb[pc->lst_fb_idx], sizeof(YV12_BUFFER_CONFIG));
1098     vpx_memcpy(&xd->dst, &pc->yv12_fb[pc->new_fb_idx], sizeof(YV12_BUFFER_CONFIG));
1099
1100     /* set up frame new frame for intra coded blocks */
1101 #if CONFIG_MULTITHREAD
1102     if (!(pbi->b_multithreaded_rd) || pc->multi_token_partition == ONE_PARTITION || !(pc->filter_level))
1103 #endif
1104         vp8_setup_intra_recon(&pc->yv12_fb[pc->new_fb_idx]);
1105
1106     vp8_setup_block_dptrs(xd);
1107
1108     vp8_build_block_doffsets(xd);
1109
1110     /* clear out the coeff buffer */
1111     vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
1112
1113     /* Read the mb_no_coeff_skip flag */
1114     pc->mb_no_coeff_skip = (int)vp8_read_bit(bc);
1115
1116
1117     vp8_decode_mode_mvs(pbi);
1118
1119 #if CONFIG_ERROR_CONCEALMENT
1120     if (pbi->ec_active &&
1121             pbi->mvs_corrupt_from_mb < (unsigned int)pc->mb_cols * pc->mb_rows)
1122     {
1123         /* Motion vectors are missing in this frame. We will try to estimate
1124          * them and then continue decoding the frame as usual */
1125         vp8_estimate_missing_mvs(pbi);
1126     }
1127 #endif
1128
1129     vpx_memset(pc->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) * pc->mb_cols);
1130     pbi->frame_corrupt_residual = 0;
1131
1132 #if CONFIG_MULTITHREAD
1133     if (pbi->b_multithreaded_rd && pc->multi_token_partition != ONE_PARTITION)
1134     {
1135         int i;
1136         vp8mt_decode_mb_rows(pbi, xd);
1137         vp8_yv12_extend_frame_borders(&pc->yv12_fb[pc->new_fb_idx]);    /*cm->frame_to_show);*/
1138         for (i = 0; i < pbi->decoding_thread_count; ++i)
1139             corrupt_tokens |= pbi->mb_row_di[i].mbd.corrupted;
1140     }
1141     else
1142 #endif
1143     {
1144         decode_mb_rows(pbi);
1145         corrupt_tokens |= xd->corrupted;
1146     }
1147
1148     stop_token_decoder(pbi);
1149
1150     /* Collect information about decoder corruption. */
1151     /* 1. Check first boolean decoder for errors. */
1152     pc->yv12_fb[pc->new_fb_idx].corrupted = vp8dx_bool_error(bc);
1153     /* 2. Check the macroblock information */
1154     pc->yv12_fb[pc->new_fb_idx].corrupted |= corrupt_tokens;
1155
1156     if (!pbi->decoded_key_frame)
1157     {
1158         if (pc->frame_type == KEY_FRAME &&
1159             !pc->yv12_fb[pc->new_fb_idx].corrupted)
1160             pbi->decoded_key_frame = 1;
1161         else
1162             vpx_internal_error(&pbi->common.error, VPX_CODEC_CORRUPT_FRAME,
1163                                "A stream must start with a complete key frame");
1164     }
1165
1166     /* vpx_log("Decoder: Frame Decoded, Size Roughly:%d bytes  \n",bc->pos+pbi->bc2.pos); */
1167
1168     /* If this was a kf or Gf note the Q used */
1169     if ((pc->frame_type == KEY_FRAME) ||
1170          pc->refresh_golden_frame || pc->refresh_alt_ref_frame)
1171     {
1172         pc->last_kf_gf_q = pc->base_qindex;
1173     }
1174
1175     if (pc->refresh_entropy_probs == 0)
1176     {
1177         vpx_memcpy(&pc->fc, &pc->lfc, sizeof(pc->fc));
1178         pbi->independent_partitions = prev_independent_partitions;
1179     }
1180
1181 #ifdef PACKET_TESTING
1182     {
1183         FILE *f = fopen("decompressor.VP8", "ab");
1184         unsigned int size = pbi->bc2.pos + pbi->bc.pos + 8;
1185         fwrite((void *) &size, 4, 1, f);
1186         fwrite((void *) pbi->Source, size, 1, f);
1187         fclose(f);
1188     }
1189 #endif
1190
1191     return 0;
1192 }