granicus.if.org Git - libvpx/blob - vp8/decoder/decodeframe.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 "vp8_rtcd.h"
  14 #include "./vpx_scale_rtcd.h"
  15 #include "onyxd_int.h"
  16 #include "vp8/common/header.h"
  17 #include "vp8/common/reconintra4x4.h"
  18 #include "vp8/common/reconinter.h"
  19 #include "detokenize.h"
  20 #include "vp8/common/common.h"
  21 #include "vp8/common/invtrans.h"
  22 #include "vp8/common/alloccommon.h"
  23 #include "vp8/common/entropymode.h"
  24 #include "vp8/common/quant_common.h"
  25 #include "vpx_scale/vpx_scale.h"
  26 #include "vp8/common/setupintrarecon.h"
  27
  28 #include "decodemv.h"
  29 #include "vp8/common/extend.h"
  30 #if CONFIG_ERROR_CONCEALMENT
  31 #include "error_concealment.h"
  32 #endif
  33 #include "vpx_mem/vpx_mem.h"
  34 #include "vp8/common/threading.h"
  35 #include "decoderthreading.h"
  36 #include "dboolhuff.h"
  37
  38 #include <assert.h>
  39 #include <stdio.h>
  40
  41 void vp8cx_init_de_quantizer(VP8D_COMP *pbi)
  42 {
  43     int Q;
  44     VP8_COMMON *const pc = & pbi->common;
  45
  46     for (Q = 0; Q < QINDEX_RANGE; Q++)
  47     {
  48         pc->Y1dequant[Q][0] = (short)vp8_dc_quant(Q, pc->y1dc_delta_q);
  49         pc->Y2dequant[Q][0] = (short)vp8_dc2quant(Q, pc->y2dc_delta_q);
  50         pc->UVdequant[Q][0] = (short)vp8_dc_uv_quant(Q, pc->uvdc_delta_q);
  51
  52         pc->Y1dequant[Q][1] = (short)vp8_ac_yquant(Q);
  53         pc->Y2dequant[Q][1] = (short)vp8_ac2quant(Q, pc->y2ac_delta_q);
  54         pc->UVdequant[Q][1] = (short)vp8_ac_uv_quant(Q, pc->uvac_delta_q);
  55     }
  56 }
  57
  58 void vp8_mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
  59 {
  60     int i;
  61     int QIndex;
  62     MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
  63     VP8_COMMON *const pc = & pbi->common;
  64
  65     /* Decide whether to use the default or alternate baseline Q value. */
  66     if (xd->segmentation_enabled)
  67     {
  68         /* Abs Value */
  69         if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
  70             QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
  71
  72         /* Delta Value */
  73         else
  74         {
  75             QIndex = pc->base_qindex + xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
  76             QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0;    /* Clamp to valid range */
  77         }
  78     }
  79     else
  80         QIndex = pc->base_qindex;
  81
  82     /* Set up the macroblock dequant constants */
  83     xd->dequant_y1_dc[0] = 1;
  84     xd->dequant_y1[0] = pc->Y1dequant[QIndex][0];
  85     xd->dequant_y2[0] = pc->Y2dequant[QIndex][0];
  86     xd->dequant_uv[0] = pc->UVdequant[QIndex][0];
  87
  88     for (i = 1; i < 16; i++)
  89     {
  90         xd->dequant_y1_dc[i] =
  91         xd->dequant_y1[i] = pc->Y1dequant[QIndex][1];
  92         xd->dequant_y2[i] = pc->Y2dequant[QIndex][1];
  93         xd->dequant_uv[i] = pc->UVdequant[QIndex][1];
  94     }
  95 }
  96
  97 static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
  98                               unsigned int mb_idx)
  99 {
 100     MB_PREDICTION_MODE mode;
 101     int i;
 102 #if CONFIG_ERROR_CONCEALMENT
 103     int corruption_detected = 0;
 104 #endif
 105
 106     if (xd->mode_info_context->mbmi.mb_skip_coeff)
 107     {
 108         vp8_reset_mb_tokens_context(xd);
 109     }
 110     else if (!vp8dx_bool_error(xd->current_bc))
 111     {
 112         int eobtotal;
 113         eobtotal = vp8_decode_mb_tokens(pbi, xd);
 114
 115         /* Special case:  Force the loopfilter to skip when eobtotal is zero */
 116         xd->mode_info_context->mbmi.mb_skip_coeff = (eobtotal==0);
 117     }
 118
 119     mode = xd->mode_info_context->mbmi.mode;
 120
 121     if (xd->segmentation_enabled)
 122         vp8_mb_init_dequantizer(pbi, xd);
 123
 124
 125 #if CONFIG_ERROR_CONCEALMENT
 126
 127     if(pbi->ec_active)
 128     {
 129         int throw_residual;
 130         /* When we have independent partitions we can apply residual even
 131          * though other partitions within the frame are corrupt.
 132          */
 133         throw_residual = (!pbi->independent_partitions &&
 134                           pbi->frame_corrupt_residual);
 135         throw_residual = (throw_residual || vp8dx_bool_error(xd->current_bc));
 136
 137         if ((mb_idx >= pbi->mvs_corrupt_from_mb || throw_residual))
 138         {
 139             /* MB with corrupt residuals or corrupt mode/motion vectors.
 140              * Better to use the predictor as reconstruction.
 141              */
 142             pbi->frame_corrupt_residual = 1;
 143             vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
 144             vp8_conceal_corrupt_mb(xd);
 145
 146
 147             corruption_detected = 1;
 148
 149             /* force idct to be skipped for B_PRED and use the
 150              * prediction only for reconstruction
 151              * */
 152             vpx_memset(xd->eobs, 0, 25);
 153         }
 154     }
 155 #endif
 156
 157     /* do prediction */
 158     if (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME)
 159     {
 160         vp8_build_intra_predictors_mbuv_s(xd,
 161                                           xd->recon_above[1],
 162                                           xd->recon_above[2],
 163                                           xd->recon_left[1],
 164                                           xd->recon_left[2],
 165                                           xd->recon_left_stride[1],
 166                                           xd->dst.u_buffer, xd->dst.v_buffer,
 167                                           xd->dst.uv_stride);
 168
 169         if (mode != B_PRED)
 170         {
 171             vp8_build_intra_predictors_mby_s(xd,
 172                                                  xd->recon_above[0],
 173                                                  xd->recon_left[0],
 174                                                  xd->recon_left_stride[0],
 175                                                  xd->dst.y_buffer,
 176                                                  xd->dst.y_stride);
 177         }
 178         else
 179         {
 180             short *DQC = xd->dequant_y1;
 181             int dst_stride = xd->dst.y_stride;
 182
 183             /* clear out residual eob info */
 184             if(xd->mode_info_context->mbmi.mb_skip_coeff)
 185                 vpx_memset(xd->eobs, 0, 25);
 186
 187             intra_prediction_down_copy(xd, xd->recon_above[0] + 16);
 188
 189             for (i = 0; i < 16; i++)
 190             {
 191                 BLOCKD *b = &xd->block[i];
 192                 unsigned char *dst = xd->dst.y_buffer + b->offset;
 193                 B_PREDICTION_MODE b_mode =
 194                     xd->mode_info_context->bmi[i].as_mode;
 195                 unsigned char *Above = dst - dst_stride;
 196                 unsigned char *yleft = dst - 1;
 197                 int left_stride = dst_stride;
 198                 unsigned char top_left = Above[-1];
 199
 200                 vp8_intra4x4_predict(Above, yleft, left_stride, b_mode,
 201                                      dst, dst_stride, top_left);
 202
 203                 if (xd->eobs[i])
 204                 {
 205                     if (xd->eobs[i] > 1)
 206                     {
 207                     vp8_dequant_idct_add(b->qcoeff, DQC, dst, dst_stride);
 208                     }
 209                     else
 210                     {
 211                         vp8_dc_only_idct_add
 212                             (b->qcoeff[0] * DQC[0],
 213                                 dst, dst_stride,
 214                                 dst, dst_stride);
 215                         vpx_memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));
 216                     }
 217                 }
 218             }
 219         }
 220     }
 221     else
 222     {
 223         vp8_build_inter_predictors_mb(xd);
 224     }
 225
 226
 227 #if CONFIG_ERROR_CONCEALMENT
 228     if (corruption_detected)
 229     {
 230         return;
 231     }
 232 #endif
 233
 234     if(!xd->mode_info_context->mbmi.mb_skip_coeff)
 235     {
 236         /* dequantization and idct */
 237         if (mode != B_PRED)
 238         {
 239             short *DQC = xd->dequant_y1;
 240
 241             if (mode != SPLITMV)
 242             {
 243                 BLOCKD *b = &xd->block[24];
 244
 245                 /* do 2nd order transform on the dc block */
 246                 if (xd->eobs[24] > 1)
 247                 {
 248                     vp8_dequantize_b(b, xd->dequant_y2);
 249
 250                     vp8_short_inv_walsh4x4(&b->dqcoeff[0],
 251                         xd->qcoeff);
 252                     vpx_memset(b->qcoeff, 0, 16 * sizeof(b->qcoeff[0]));
 253                 }
 254                 else
 255                 {
 256                     b->dqcoeff[0] = b->qcoeff[0] * xd->dequant_y2[0];
 257                     vp8_short_inv_walsh4x4_1(&b->dqcoeff[0],
 258                         xd->qcoeff);
 259                     vpx_memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));
 260                 }
 261
 262                 /* override the dc dequant constant in order to preserve the
 263                  * dc components
 264                  */
 265                 DQC = xd->dequant_y1_dc;
 266             }
 267
 268             vp8_dequant_idct_add_y_block
 269                             (xd->qcoeff, DQC,
 270                              xd->dst.y_buffer,
 271                              xd->dst.y_stride, xd->eobs);
 272         }
 273
 274         vp8_dequant_idct_add_uv_block
 275                         (xd->qcoeff+16*16, xd->dequant_uv,
 276                          xd->dst.u_buffer, xd->dst.v_buffer,
 277                          xd->dst.uv_stride, xd->eobs+16);
 278     }
 279 }
 280
 281 static int get_delta_q(vp8_reader *bc, int prev, int *q_update)
 282 {
 283     int ret_val = 0;
 284
 285     if (vp8_read_bit(bc))
 286     {
 287         ret_val = vp8_read_literal(bc, 4);
 288
 289         if (vp8_read_bit(bc))
 290             ret_val = -ret_val;
 291     }
 292
 293     /* Trigger a quantizer update if the delta-q value has changed */
 294     if (ret_val != prev)
 295         *q_update = 1;
 296
 297     return ret_val;
 298 }
 299
 300 #ifdef PACKET_TESTING
 301 #include <stdio.h>
 302 FILE *vpxlog = 0;
 303 #endif
 304
 305 static void yv12_extend_frame_top_c(YV12_BUFFER_CONFIG *ybf)
 306 {
 307     int i;
 308     unsigned char *src_ptr1;
 309     unsigned char *dest_ptr1;
 310
 311     unsigned int Border;
 312     int plane_stride;
 313
 314     /***********/
 315     /* Y Plane */
 316     /***********/
 317     Border = ybf->border;
 318     plane_stride = ybf->y_stride;
 319     src_ptr1 = ybf->y_buffer - Border;
 320     dest_ptr1 = src_ptr1 - (Border * plane_stride);
 321
 322     for (i = 0; i < (int)Border; i++)
 323     {
 324         vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
 325         dest_ptr1 += plane_stride;
 326     }
 327
 328
 329     /***********/
 330     /* U Plane */
 331     /***********/
 332     plane_stride = ybf->uv_stride;
 333     Border /= 2;
 334     src_ptr1 = ybf->u_buffer - Border;
 335     dest_ptr1 = src_ptr1 - (Border * plane_stride);
 336
 337     for (i = 0; i < (int)(Border); i++)
 338     {
 339         vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
 340         dest_ptr1 += plane_stride;
 341     }
 342
 343     /***********/
 344     /* V Plane */
 345     /***********/
 346
 347     src_ptr1 = ybf->v_buffer - Border;
 348     dest_ptr1 = src_ptr1 - (Border * plane_stride);
 349
 350     for (i = 0; i < (int)(Border); i++)
 351     {
 352         vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
 353         dest_ptr1 += plane_stride;
 354     }
 355 }
 356
 357 static void yv12_extend_frame_bottom_c(YV12_BUFFER_CONFIG *ybf)
 358 {
 359     int i;
 360     unsigned char *src_ptr1, *src_ptr2;
 361     unsigned char *dest_ptr2;
 362
 363     unsigned int Border;
 364     int plane_stride;
 365     int plane_height;
 366
 367     /***********/
 368     /* Y Plane */
 369     /***********/
 370     Border = ybf->border;
 371     plane_stride = ybf->y_stride;
 372     plane_height = ybf->y_height;
 373
 374     src_ptr1 = ybf->y_buffer - Border;
 375     src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
 376     dest_ptr2 = src_ptr2 + plane_stride;
 377
 378     for (i = 0; i < (int)Border; i++)
 379     {
 380         vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
 381         dest_ptr2 += plane_stride;
 382     }
 383
 384
 385     /***********/
 386     /* U Plane */
 387     /***********/
 388     plane_stride = ybf->uv_stride;
 389     plane_height = ybf->uv_height;
 390     Border /= 2;
 391
 392     src_ptr1 = ybf->u_buffer - Border;
 393     src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
 394     dest_ptr2 = src_ptr2 + plane_stride;
 395
 396     for (i = 0; i < (int)(Border); i++)
 397     {
 398         vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
 399         dest_ptr2 += plane_stride;
 400     }
 401
 402     /***********/
 403     /* V Plane */
 404     /***********/
 405
 406     src_ptr1 = ybf->v_buffer - Border;
 407     src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
 408     dest_ptr2 = src_ptr2 + plane_stride;
 409
 410     for (i = 0; i < (int)(Border); i++)
 411     {
 412         vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
 413         dest_ptr2 += plane_stride;
 414     }
 415 }
 416
 417 static void yv12_extend_frame_left_right_c(YV12_BUFFER_CONFIG *ybf,
 418                                            unsigned char *y_src,
 419                                            unsigned char *u_src,
 420                                            unsigned char *v_src)
 421 {
 422     int i;
 423     unsigned char *src_ptr1, *src_ptr2;
 424     unsigned char *dest_ptr1, *dest_ptr2;
 425
 426     unsigned int Border;
 427     int plane_stride;
 428     int plane_height;
 429     int plane_width;
 430
 431     /***********/
 432     /* Y Plane */
 433     /***********/
 434     Border = ybf->border;
 435     plane_stride = ybf->y_stride;
 436     plane_height = 16;
 437     plane_width = ybf->y_width;
 438
 439     /* copy the left and right most columns out */
 440     src_ptr1 = y_src;
 441     src_ptr2 = src_ptr1 + plane_width - 1;
 442     dest_ptr1 = src_ptr1 - Border;
 443     dest_ptr2 = src_ptr2 + 1;
 444
 445     for (i = 0; i < plane_height; i++)
 446     {
 447         vpx_memset(dest_ptr1, src_ptr1[0], Border);
 448         vpx_memset(dest_ptr2, src_ptr2[0], Border);
 449         src_ptr1  += plane_stride;
 450         src_ptr2  += plane_stride;
 451         dest_ptr1 += plane_stride;
 452         dest_ptr2 += plane_stride;
 453     }
 454
 455     /***********/
 456     /* U Plane */
 457     /***********/
 458     plane_stride = ybf->uv_stride;
 459     plane_height = 8;
 460     plane_width = ybf->uv_width;
 461     Border /= 2;
 462
 463     /* copy the left and right most columns out */
 464     src_ptr1 = u_src;
 465     src_ptr2 = src_ptr1 + plane_width - 1;
 466     dest_ptr1 = src_ptr1 - Border;
 467     dest_ptr2 = src_ptr2 + 1;
 468
 469     for (i = 0; i < plane_height; i++)
 470     {
 471         vpx_memset(dest_ptr1, src_ptr1[0], Border);
 472         vpx_memset(dest_ptr2, src_ptr2[0], Border);
 473         src_ptr1  += plane_stride;
 474         src_ptr2  += plane_stride;
 475         dest_ptr1 += plane_stride;
 476         dest_ptr2 += plane_stride;
 477     }
 478
 479     /***********/
 480     /* V Plane */
 481     /***********/
 482
 483     /* copy the left and right most columns out */
 484     src_ptr1 = v_src;
 485     src_ptr2 = src_ptr1 + plane_width - 1;
 486     dest_ptr1 = src_ptr1 - Border;
 487     dest_ptr2 = src_ptr2 + 1;
 488
 489     for (i = 0; i < plane_height; i++)
 490     {
 491         vpx_memset(dest_ptr1, src_ptr1[0], Border);
 492         vpx_memset(dest_ptr2, src_ptr2[0], Border);
 493         src_ptr1  += plane_stride;
 494         src_ptr2  += plane_stride;
 495         dest_ptr1 += plane_stride;
 496         dest_ptr2 += plane_stride;
 497     }
 498 }
 499
 500 static void decode_mb_rows(VP8D_COMP *pbi)
 501 {
 502     VP8_COMMON *const pc = & pbi->common;
 503     MACROBLOCKD *const xd  = & pbi->mb;
 504
 505     MODE_INFO *lf_mic = xd->mode_info_context;
 506
 507     int ibc = 0;
 508     int num_part = 1 << pc->multi_token_partition;
 509
 510     int recon_yoffset, recon_uvoffset;
 511     int mb_row, mb_col;
 512     int mb_idx = 0;
 513
 514     YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];
 515
 516     int recon_y_stride = yv12_fb_new->y_stride;
 517     int recon_uv_stride = yv12_fb_new->uv_stride;
 518
 519     unsigned char *ref_buffer[MAX_REF_FRAMES][3];
 520     unsigned char *dst_buffer[3];
 521     unsigned char *lf_dst[3];
 522     unsigned char *eb_dst[3];
 523     int i;
 524     int ref_fb_corrupted[MAX_REF_FRAMES];
 525
 526     ref_fb_corrupted[INTRA_FRAME] = 0;
 527
 528     for(i = 1; i < MAX_REF_FRAMES; i++)
 529     {
 530         YV12_BUFFER_CONFIG *this_fb = pbi->dec_fb_ref[i];
 531
 532         ref_buffer[i][0] = this_fb->y_buffer;
 533         ref_buffer[i][1] = this_fb->u_buffer;
 534         ref_buffer[i][2] = this_fb->v_buffer;
 535
 536         ref_fb_corrupted[i] = this_fb->corrupted;
 537     }
 538
 539     /* Set up the buffer pointers */
 540     eb_dst[0] = lf_dst[0] = dst_buffer[0] = yv12_fb_new->y_buffer;
 541     eb_dst[1] = lf_dst[1] = dst_buffer[1] = yv12_fb_new->u_buffer;
 542     eb_dst[2] = lf_dst[2] = dst_buffer[2] = yv12_fb_new->v_buffer;
 543
 544     xd->up_available = 0;
 545
 546     /* Initialize the loop filter for this frame. */
 547     if(pc->filter_level)
 548         vp8_loop_filter_frame_init(pc, xd, pc->filter_level);
 549
 550     vp8_setup_intra_recon_top_line(yv12_fb_new);
 551
 552     /* Decode the individual macro block */
 553     for (mb_row = 0; mb_row < pc->mb_rows; mb_row++)
 554     {
 555         if (num_part > 1)
 556         {
 557             xd->current_bc = & pbi->mbc[ibc];
 558             ibc++;
 559
 560             if (ibc == num_part)
 561                 ibc = 0;
 562         }
 563
 564         recon_yoffset = mb_row * recon_y_stride * 16;
 565         recon_uvoffset = mb_row * recon_uv_stride * 8;
 566
 567         /* reset contexts */
 568         xd->above_context = pc->above_context;
 569         vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
 570
 571         xd->left_available = 0;
 572
 573         xd->mb_to_top_edge = -((mb_row * 16) << 3);
 574         xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
 575
 576         xd->recon_above[0] = dst_buffer[0] + recon_yoffset;
 577         xd->recon_above[1] = dst_buffer[1] + recon_uvoffset;
 578         xd->recon_above[2] = dst_buffer[2] + recon_uvoffset;
 579
 580         xd->recon_left[0] = xd->recon_above[0] - 1;
 581         xd->recon_left[1] = xd->recon_above[1] - 1;
 582         xd->recon_left[2] = xd->recon_above[2] - 1;
 583
 584         xd->recon_above[0] -= xd->dst.y_stride;
 585         xd->recon_above[1] -= xd->dst.uv_stride;
 586         xd->recon_above[2] -= xd->dst.uv_stride;
 587
 588         /* TODO: move to outside row loop */
 589         xd->recon_left_stride[0] = xd->dst.y_stride;
 590         xd->recon_left_stride[1] = xd->dst.uv_stride;
 591
 592         setup_intra_recon_left(xd->recon_left[0], xd->recon_left[1],
 593                                xd->recon_left[2], xd->dst.y_stride,
 594                                xd->dst.uv_stride);
 595
 596         for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
 597         {
 598             /* Distance of Mb to the various image edges.
 599              * These are specified to 8th pel as they are always compared to values
 600              * that are in 1/8th pel units
 601              */
 602             xd->mb_to_left_edge = -((mb_col * 16) << 3);
 603             xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
 604
 605 #if CONFIG_ERROR_CONCEALMENT
 606             {
 607                 int corrupt_residual = (!pbi->independent_partitions &&
 608                                        pbi->frame_corrupt_residual) ||
 609                                        vp8dx_bool_error(xd->current_bc);
 610                 if (pbi->ec_active &&
 611                     xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME &&
 612                     corrupt_residual)
 613                 {
 614                     /* We have an intra block with corrupt coefficients, better to
 615                      * conceal with an inter block. Interpolate MVs from neighboring
 616                      * MBs.
 617                      *
 618                      * Note that for the first mb with corrupt residual in a frame,
 619                      * we might not discover that before decoding the residual. That
 620                      * happens after this check, and therefore no inter concealment
 621                      * will be done.
 622                      */
 623                     vp8_interpolate_motion(xd,
 624                                            mb_row, mb_col,
 625                                            pc->mb_rows, pc->mb_cols,
 626                                            pc->mode_info_stride);
 627                 }
 628             }
 629 #endif
 630
 631             xd->dst.y_buffer = dst_buffer[0] + recon_yoffset;
 632             xd->dst.u_buffer = dst_buffer[1] + recon_uvoffset;
 633             xd->dst.v_buffer = dst_buffer[2] + recon_uvoffset;
 634
 635             if (xd->mode_info_context->mbmi.ref_frame >= LAST_FRAME) {
 636               MV_REFERENCE_FRAME ref = xd->mode_info_context->mbmi.ref_frame;
 637               xd->pre.y_buffer = ref_buffer[ref][0] + recon_yoffset;
 638               xd->pre.u_buffer = ref_buffer[ref][1] + recon_uvoffset;
 639               xd->pre.v_buffer = ref_buffer[ref][2] + recon_uvoffset;
 640             } else {
 641               // ref_frame is INTRA_FRAME, pre buffer should not be used.
 642               xd->pre.y_buffer = 0;
 643               xd->pre.u_buffer = 0;
 644               xd->pre.v_buffer = 0;
 645             }
 646
 647             /* propagate errors from reference frames */
 648             xd->corrupted |= ref_fb_corrupted[xd->mode_info_context->mbmi.ref_frame];
 649
 650             decode_macroblock(pbi, xd, mb_idx);
 651
 652             mb_idx++;
 653             xd->left_available = 1;
 654
 655             /* check if the boolean decoder has suffered an error */
 656             xd->corrupted |= vp8dx_bool_error(xd->current_bc);
 657
 658             xd->recon_above[0] += 16;
 659             xd->recon_above[1] += 8;
 660             xd->recon_above[2] += 8;
 661             xd->recon_left[0] += 16;
 662             xd->recon_left[1] += 8;
 663             xd->recon_left[2] += 8;
 664
 665             recon_yoffset += 16;
 666             recon_uvoffset += 8;
 667
 668             ++xd->mode_info_context;  /* next mb */
 669
 670             xd->above_context++;
 671         }
 672
 673         /* adjust to the next row of mbs */
 674         vp8_extend_mb_row(yv12_fb_new, xd->dst.y_buffer + 16,
 675                           xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
 676
 677         ++xd->mode_info_context;      /* skip prediction column */
 678         xd->up_available = 1;
 679
 680         if(pc->filter_level)
 681         {
 682             if(mb_row > 0)
 683             {
 684                 if (pc->filter_type == NORMAL_LOOPFILTER)
 685                     vp8_loop_filter_row_normal(pc, lf_mic, mb_row-1,
 686                                                recon_y_stride, recon_uv_stride,
 687                                                lf_dst[0], lf_dst[1], lf_dst[2]);
 688                 else
 689                     vp8_loop_filter_row_simple(pc, lf_mic, mb_row-1,
 690                                                recon_y_stride, recon_uv_stride,
 691                                                lf_dst[0], lf_dst[1], lf_dst[2]);
 692                 if(mb_row > 1)
 693                 {
 694                     yv12_extend_frame_left_right_c(yv12_fb_new,
 695                                                    eb_dst[0],
 696                                                    eb_dst[1],
 697                                                    eb_dst[2]);
 698
 699                     eb_dst[0] += recon_y_stride  * 16;
 700                     eb_dst[1] += recon_uv_stride *  8;
 701                     eb_dst[2] += recon_uv_stride *  8;
 702                 }
 703
 704                 lf_dst[0] += recon_y_stride  * 16;
 705                 lf_dst[1] += recon_uv_stride *  8;
 706                 lf_dst[2] += recon_uv_stride *  8;
 707                 lf_mic += pc->mb_cols;
 708                 lf_mic++;         /* Skip border mb */
 709             }
 710         }
 711         else
 712         {
 713             if(mb_row > 0)
 714             {
 715                 /**/
 716                 yv12_extend_frame_left_right_c(yv12_fb_new,
 717                                                eb_dst[0],
 718                                                eb_dst[1],
 719                                                eb_dst[2]);
 720                 eb_dst[0] += recon_y_stride  * 16;
 721                 eb_dst[1] += recon_uv_stride *  8;
 722                 eb_dst[2] += recon_uv_stride *  8;
 723             }
 724         }
 725     }
 726
 727     if(pc->filter_level)
 728     {
 729         if (pc->filter_type == NORMAL_LOOPFILTER)
 730             vp8_loop_filter_row_normal(pc, lf_mic, mb_row-1, recon_y_stride,
 731                                        recon_uv_stride, lf_dst[0], lf_dst[1],
 732                                        lf_dst[2]);
 733         else
 734             vp8_loop_filter_row_simple(pc, lf_mic, mb_row-1, recon_y_stride,
 735                                        recon_uv_stride, lf_dst[0], lf_dst[1],
 736                                        lf_dst[2]);
 737
 738         yv12_extend_frame_left_right_c(yv12_fb_new,
 739                                        eb_dst[0],
 740                                        eb_dst[1],
 741                                        eb_dst[2]);
 742         eb_dst[0] += recon_y_stride  * 16;
 743         eb_dst[1] += recon_uv_stride *  8;
 744         eb_dst[2] += recon_uv_stride *  8;
 745     }
 746     yv12_extend_frame_left_right_c(yv12_fb_new,
 747                                    eb_dst[0],
 748                                    eb_dst[1],
 749                                    eb_dst[2]);
 750     yv12_extend_frame_top_c(yv12_fb_new);
 751     yv12_extend_frame_bottom_c(yv12_fb_new);
 752
 753 }
 754
 755 static unsigned int read_partition_size(VP8D_COMP *pbi,
 756                                         const unsigned char *cx_size)
 757 {
 758     unsigned char temp[3];
 759     if (pbi->decrypt_cb)
 760     {
 761         pbi->decrypt_cb(pbi->decrypt_state, cx_size, temp, 3);
 762         cx_size = temp;
 763     }
 764     return cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);
 765 }
 766
 767 static int read_is_valid(const unsigned char *start,
 768                          size_t               len,
 769                          const unsigned char *end)
 770 {
 771     return (start + len > start && start + len <= end);
 772 }
 773
 774 static unsigned int read_available_partition_size(
 775                                        VP8D_COMP *pbi,
 776                                        const unsigned char *token_part_sizes,
 777                                        const unsigned char *fragment_start,
 778                                        const unsigned char *first_fragment_end,
 779                                        const unsigned char *fragment_end,
 780                                        int i,
 781                                        int num_part)
 782 {
 783     VP8_COMMON* pc = &pbi->common;
 784     const unsigned char *partition_size_ptr = token_part_sizes + i * 3;
 785     unsigned int partition_size = 0;
 786     ptrdiff_t bytes_left = fragment_end - fragment_start;
 787     /* Calculate the length of this partition. The last partition
 788      * size is implicit. If the partition size can't be read, then
 789      * either use the remaining data in the buffer (for EC mode)
 790      * or throw an error.
 791      */
 792     if (i < num_part - 1)
 793     {
 794         if (read_is_valid(partition_size_ptr, 3, first_fragment_end))
 795             partition_size = read_partition_size(pbi, partition_size_ptr);
 796         else if (pbi->ec_active)
 797             partition_size = (unsigned int)bytes_left;
 798         else
 799             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 800                                "Truncated partition size data");
 801     }
 802     else
 803         partition_size = (unsigned int)bytes_left;
 804
 805     /* Validate the calculated partition length. If the buffer
 806      * described by the partition can't be fully read, then restrict
 807      * it to the portion that can be (for EC mode) or throw an error.
 808      */
 809     if (!read_is_valid(fragment_start, partition_size, fragment_end))
 810     {
 811         if (pbi->ec_active)
 812             partition_size = (unsigned int)bytes_left;
 813         else
 814             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 815                                "Truncated packet or corrupt partition "
 816                                "%d length", i + 1);
 817     }
 818     return partition_size;
 819 }
 820
 821
 822 static void setup_token_decoder(VP8D_COMP *pbi,
 823                                 const unsigned char* token_part_sizes)
 824 {
 825     vp8_reader *bool_decoder = &pbi->mbc[0];
 826     unsigned int partition_idx;
 827     unsigned int fragment_idx;
 828     unsigned int num_token_partitions;
 829     const unsigned char *first_fragment_end = pbi->fragments.ptrs[0] +
 830                                           pbi->fragments.sizes[0];
 831
 832     TOKEN_PARTITION multi_token_partition =
 833             (TOKEN_PARTITION)vp8_read_literal(&pbi->mbc[8], 2);
 834     if (!vp8dx_bool_error(&pbi->mbc[8]))
 835         pbi->common.multi_token_partition = multi_token_partition;
 836     num_token_partitions = 1 << pbi->common.multi_token_partition;
 837
 838     /* Check for partitions within the fragments and unpack the fragments
 839      * so that each fragment pointer points to its corresponding partition. */
 840     for (fragment_idx = 0; fragment_idx < pbi->fragments.count; ++fragment_idx)
 841     {
 842         unsigned int fragment_size = pbi->fragments.sizes[fragment_idx];
 843         const unsigned char *fragment_end = pbi->fragments.ptrs[fragment_idx] +
 844                                             fragment_size;
 845         /* Special case for handling the first partition since we have already
 846          * read its size. */
 847         if (fragment_idx == 0)
 848         {
 849             /* Size of first partition + token partition sizes element */
 850             ptrdiff_t ext_first_part_size = token_part_sizes -
 851                 pbi->fragments.ptrs[0] + 3 * (num_token_partitions - 1);
 852             fragment_size -= (unsigned int)ext_first_part_size;
 853             if (fragment_size > 0)
 854             {
 855                 pbi->fragments.sizes[0] = (unsigned int)ext_first_part_size;
 856                 /* The fragment contains an additional partition. Move to
 857                  * next. */
 858                 fragment_idx++;
 859                 pbi->fragments.ptrs[fragment_idx] = pbi->fragments.ptrs[0] +
 860                   pbi->fragments.sizes[0];
 861             }
 862         }
 863         /* Split the chunk into partitions read from the bitstream */
 864         while (fragment_size > 0)
 865         {
 866             ptrdiff_t partition_size = read_available_partition_size(
 867                                                  pbi,
 868                                                  token_part_sizes,
 869                                                  pbi->fragments.ptrs[fragment_idx],
 870                                                  first_fragment_end,
 871                                                  fragment_end,
 872                                                  fragment_idx - 1,
 873                                                  num_token_partitions);
 874             pbi->fragments.sizes[fragment_idx] = (unsigned int)partition_size;
 875             fragment_size -= (unsigned int)partition_size;
 876             assert(fragment_idx <= num_token_partitions);
 877             if (fragment_size > 0)
 878             {
 879                 /* The fragment contains an additional partition.
 880                  * Move to next. */
 881                 fragment_idx++;
 882                 pbi->fragments.ptrs[fragment_idx] =
 883                     pbi->fragments.ptrs[fragment_idx - 1] + partition_size;
 884             }
 885         }
 886     }
 887
 888     pbi->fragments.count = num_token_partitions + 1;
 889
 890     for (partition_idx = 1; partition_idx < pbi->fragments.count; ++partition_idx)
 891     {
 892         if (vp8dx_start_decode(bool_decoder,
 893                                pbi->fragments.ptrs[partition_idx],
 894                                pbi->fragments.sizes[partition_idx],
 895                                pbi->decrypt_cb, pbi->decrypt_state))
 896             vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,
 897                                "Failed to allocate bool decoder %d",
 898                                partition_idx);
 899
 900         bool_decoder++;
 901     }
 902
 903 #if CONFIG_MULTITHREAD
 904     /* Clamp number of decoder threads */
 905     if (pbi->decoding_thread_count > num_token_partitions - 1)
 906         pbi->decoding_thread_count = num_token_partitions - 1;
 907 #endif
 908 }
 909
 910
 911 static void init_frame(VP8D_COMP *pbi)
 912 {
 913     VP8_COMMON *const pc = & pbi->common;
 914     MACROBLOCKD *const xd  = & pbi->mb;
 915
 916     if (pc->frame_type == KEY_FRAME)
 917     {
 918         /* Various keyframe initializations */
 919         vpx_memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
 920
 921         vp8_init_mbmode_probs(pc);
 922
 923         vp8_default_coef_probs(pc);
 924
 925         /* reset the segment feature data to 0 with delta coding (Default state). */
 926         vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
 927         xd->mb_segement_abs_delta = SEGMENT_DELTADATA;
 928
 929         /* reset the mode ref deltasa for loop filter */
 930         vpx_memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));
 931         vpx_memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));
 932
 933         /* All buffers are implicitly updated on key frames. */
 934         pc->refresh_golden_frame = 1;
 935         pc->refresh_alt_ref_frame = 1;
 936         pc->copy_buffer_to_gf = 0;
 937         pc->copy_buffer_to_arf = 0;
 938
 939         /* Note that Golden and Altref modes cannot be used on a key frame so
 940          * ref_frame_sign_bias[] is undefined and meaningless
 941          */
 942         pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;
 943         pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;
 944     }
 945     else
 946     {
 947         /* To enable choice of different interploation filters */
 948         if (!pc->use_bilinear_mc_filter)
 949         {
 950             xd->subpixel_predict        = vp8_sixtap_predict4x4;
 951             xd->subpixel_predict8x4     = vp8_sixtap_predict8x4;
 952             xd->subpixel_predict8x8     = vp8_sixtap_predict8x8;
 953             xd->subpixel_predict16x16   = vp8_sixtap_predict16x16;
 954         }
 955         else
 956         {
 957             xd->subpixel_predict        = vp8_bilinear_predict4x4;
 958             xd->subpixel_predict8x4     = vp8_bilinear_predict8x4;
 959             xd->subpixel_predict8x8     = vp8_bilinear_predict8x8;
 960             xd->subpixel_predict16x16   = vp8_bilinear_predict16x16;
 961         }
 962
 963         if (pbi->decoded_key_frame && pbi->ec_enabled && !pbi->ec_active)
 964             pbi->ec_active = 1;
 965     }
 966
 967     xd->left_context = &pc->left_context;
 968     xd->mode_info_context = pc->mi;
 969     xd->frame_type = pc->frame_type;
 970     xd->mode_info_context->mbmi.mode = DC_PRED;
 971     xd->mode_info_stride = pc->mode_info_stride;
 972     xd->corrupted = 0; /* init without corruption */
 973
 974     xd->fullpixel_mask = 0xffffffff;
 975     if(pc->full_pixel)
 976         xd->fullpixel_mask = 0xfffffff8;
 977
 978 }
 979
 980 int vp8_decode_frame(VP8D_COMP *pbi)
 981 {
 982     vp8_reader *const bc = &pbi->mbc[8];
 983     VP8_COMMON *const pc = &pbi->common;
 984     MACROBLOCKD *const xd  = &pbi->mb;
 985     const unsigned char *data = pbi->fragments.ptrs[0];
 986     const unsigned char *data_end =  data + pbi->fragments.sizes[0];
 987     ptrdiff_t first_partition_length_in_bytes;
 988
 989     int i, j, k, l;
 990     const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;
 991     int corrupt_tokens = 0;
 992     int prev_independent_partitions = pbi->independent_partitions;
 993
 994     YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];
 995
 996     /* start with no corruption of current frame */
 997     xd->corrupted = 0;
 998     yv12_fb_new->corrupted = 0;
 999
1000     if (data_end - data < 3)
1001     {
1002         if (!pbi->ec_active)
1003         {
1004             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
1005                                "Truncated packet");
1006         }
1007
1008         /* Declare the missing frame as an inter frame since it will
1009            be handled as an inter frame when we have estimated its
1010            motion vectors. */
1011         pc->frame_type = INTER_FRAME;
1012         pc->version = 0;
1013         pc->show_frame = 1;
1014         first_partition_length_in_bytes = 0;
1015     }
1016     else
1017     {
1018         unsigned char clear_buffer[10];
1019         const unsigned char *clear = data;
1020         if (pbi->decrypt_cb)
1021         {
1022             int n = (int)MIN(sizeof(clear_buffer), data_end - data);
1023             pbi->decrypt_cb(pbi->decrypt_state, data, clear_buffer, n);
1024             clear = clear_buffer;
1025         }
1026
1027         pc->frame_type = (FRAME_TYPE)(clear[0] & 1);
1028         pc->version = (clear[0] >> 1) & 7;
1029         pc->show_frame = (clear[0] >> 4) & 1;
1030         first_partition_length_in_bytes =
1031             (clear[0] | (clear[1] << 8) | (clear[2] << 16)) >> 5;
1032
1033         if (!pbi->ec_active &&
1034             (data + first_partition_length_in_bytes > data_end
1035             || data + first_partition_length_in_bytes < data))
1036             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
1037                                "Truncated packet or corrupt partition 0 length");
1038
1039         data += 3;
1040         clear += 3;
1041
1042         vp8_setup_version(pc);
1043
1044
1045         if (pc->frame_type == KEY_FRAME)
1046         {
1047             /* vet via sync code */
1048             /* When error concealment is enabled we should only check the sync
1049              * code if we have enough bits available
1050              */
1051             if (!pbi->ec_active || data + 3 < data_end)
1052             {
1053                 if (clear[0] != 0x9d || clear[1] != 0x01 || clear[2] != 0x2a)
1054                     vpx_internal_error(&pc->error, VPX_CODEC_UNSUP_BITSTREAM,
1055                                    "Invalid frame sync code");
1056             }
1057
1058             /* If error concealment is enabled we should only parse the new size
1059              * if we have enough data. Otherwise we will end up with the wrong
1060              * size.
1061              */
1062             if (!pbi->ec_active || data + 6 < data_end)
1063             {
1064                 pc->Width = (clear[3] | (clear[4] << 8)) & 0x3fff;
1065                 pc->horiz_scale = clear[4] >> 6;
1066                 pc->Height = (clear[5] | (clear[6] << 8)) & 0x3fff;
1067                 pc->vert_scale = clear[6] >> 6;
1068             }
1069             data += 7;
1070             clear += 7;
1071         }
1072         else
1073         {
1074           vpx_memcpy(&xd->pre, yv12_fb_new, sizeof(YV12_BUFFER_CONFIG));
1075           vpx_memcpy(&xd->dst, yv12_fb_new, sizeof(YV12_BUFFER_CONFIG));
1076         }
1077     }
1078     if ((!pbi->decoded_key_frame && pc->frame_type != KEY_FRAME))
1079     {
1080         return -1;
1081     }
1082
1083     init_frame(pbi);
1084
1085     if (vp8dx_start_decode(bc, data, (unsigned int)(data_end - data),
1086                            pbi->decrypt_cb, pbi->decrypt_state))
1087         vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
1088                            "Failed to allocate bool decoder 0");
1089     if (pc->frame_type == KEY_FRAME) {
1090         (void)vp8_read_bit(bc);  // colorspace
1091         pc->clamp_type  = (CLAMP_TYPE)vp8_read_bit(bc);
1092     }
1093
1094     /* Is segmentation enabled */
1095     xd->segmentation_enabled = (unsigned char)vp8_read_bit(bc);
1096
1097     if (xd->segmentation_enabled)
1098     {
1099         /* Signal whether or not the segmentation map is being explicitly updated this frame. */
1100         xd->update_mb_segmentation_map = (unsigned char)vp8_read_bit(bc);
1101         xd->update_mb_segmentation_data = (unsigned char)vp8_read_bit(bc);
1102
1103         if (xd->update_mb_segmentation_data)
1104         {
1105             xd->mb_segement_abs_delta = (unsigned char)vp8_read_bit(bc);
1106
1107             vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
1108
1109             /* For each segmentation feature (Quant and loop filter level) */
1110             for (i = 0; i < MB_LVL_MAX; i++)
1111             {
1112                 for (j = 0; j < MAX_MB_SEGMENTS; j++)
1113                 {
1114                     /* Frame level data */
1115                     if (vp8_read_bit(bc))
1116                     {
1117                         xd->segment_feature_data[i][j] = (signed char)vp8_read_literal(bc, mb_feature_data_bits[i]);
1118
1119                         if (vp8_read_bit(bc))
1120                             xd->segment_feature_data[i][j] = -xd->segment_feature_data[i][j];
1121                     }
1122                     else
1123                         xd->segment_feature_data[i][j] = 0;
1124                 }
1125             }
1126         }
1127
1128         if (xd->update_mb_segmentation_map)
1129         {
1130             /* Which macro block level features are enabled */
1131             vpx_memset(xd->mb_segment_tree_probs, 255, sizeof(xd->mb_segment_tree_probs));
1132
1133             /* Read the probs used to decode the segment id for each macro block. */
1134             for (i = 0; i < MB_FEATURE_TREE_PROBS; i++)
1135             {
1136                 /* If not explicitly set value is defaulted to 255 by memset above */
1137                 if (vp8_read_bit(bc))
1138                     xd->mb_segment_tree_probs[i] = (vp8_prob)vp8_read_literal(bc, 8);
1139             }
1140         }
1141     }
1142     else
1143     {
1144         /* No segmentation updates on this frame */
1145         xd->update_mb_segmentation_map = 0;
1146         xd->update_mb_segmentation_data = 0;
1147     }
1148
1149     /* Read the loop filter level and type */
1150     pc->filter_type = (LOOPFILTERTYPE) vp8_read_bit(bc);
1151     pc->filter_level = vp8_read_literal(bc, 6);
1152     pc->sharpness_level = vp8_read_literal(bc, 3);
1153
1154     /* Read in loop filter deltas applied at the MB level based on mode or ref frame. */
1155     xd->mode_ref_lf_delta_update = 0;
1156     xd->mode_ref_lf_delta_enabled = (unsigned char)vp8_read_bit(bc);
1157
1158     if (xd->mode_ref_lf_delta_enabled)
1159     {
1160         /* Do the deltas need to be updated */
1161         xd->mode_ref_lf_delta_update = (unsigned char)vp8_read_bit(bc);
1162
1163         if (xd->mode_ref_lf_delta_update)
1164         {
1165             /* Send update */
1166             for (i = 0; i < MAX_REF_LF_DELTAS; i++)
1167             {
1168                 if (vp8_read_bit(bc))
1169                 {
1170                     /*sign = vp8_read_bit( bc );*/
1171                     xd->ref_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
1172
1173                     if (vp8_read_bit(bc))        /* Apply sign */
1174                         xd->ref_lf_deltas[i] = xd->ref_lf_deltas[i] * -1;
1175                 }
1176             }
1177
1178             /* Send update */
1179             for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
1180             {
1181                 if (vp8_read_bit(bc))
1182                 {
1183                     /*sign = vp8_read_bit( bc );*/
1184                     xd->mode_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
1185
1186                     if (vp8_read_bit(bc))        /* Apply sign */
1187                         xd->mode_lf_deltas[i] = xd->mode_lf_deltas[i] * -1;
1188                 }
1189             }
1190         }
1191     }
1192
1193     setup_token_decoder(pbi, data + first_partition_length_in_bytes);
1194
1195     xd->current_bc = &pbi->mbc[0];
1196
1197     /* Read the default quantizers. */
1198     {
1199         int Q, q_update;
1200
1201         Q = vp8_read_literal(bc, 7);  /* AC 1st order Q = default */
1202         pc->base_qindex = Q;
1203         q_update = 0;
1204         pc->y1dc_delta_q = get_delta_q(bc, pc->y1dc_delta_q, &q_update);
1205         pc->y2dc_delta_q = get_delta_q(bc, pc->y2dc_delta_q, &q_update);
1206         pc->y2ac_delta_q = get_delta_q(bc, pc->y2ac_delta_q, &q_update);
1207         pc->uvdc_delta_q = get_delta_q(bc, pc->uvdc_delta_q, &q_update);
1208         pc->uvac_delta_q = get_delta_q(bc, pc->uvac_delta_q, &q_update);
1209
1210         if (q_update)
1211             vp8cx_init_de_quantizer(pbi);
1212
1213         /* MB level dequantizer setup */
1214         vp8_mb_init_dequantizer(pbi, &pbi->mb);
1215     }
1216
1217     /* Determine if the golden frame or ARF buffer should be updated and how.
1218      * For all non key frames the GF and ARF refresh flags and sign bias
1219      * flags must be set explicitly.
1220      */
1221     if (pc->frame_type != KEY_FRAME)
1222     {
1223         /* Should the GF or ARF be updated from the current frame */
1224         pc->refresh_golden_frame = vp8_read_bit(bc);
1225 #if CONFIG_ERROR_CONCEALMENT
1226         /* Assume we shouldn't refresh golden if the bit is missing */
1227         xd->corrupted |= vp8dx_bool_error(bc);
1228         if (pbi->ec_active && xd->corrupted)
1229             pc->refresh_golden_frame = 0;
1230 #endif
1231
1232         pc->refresh_alt_ref_frame = vp8_read_bit(bc);
1233 #if CONFIG_ERROR_CONCEALMENT
1234         /* Assume we shouldn't refresh altref if the bit is missing */
1235         xd->corrupted |= vp8dx_bool_error(bc);
1236         if (pbi->ec_active && xd->corrupted)
1237             pc->refresh_alt_ref_frame = 0;
1238 #endif
1239
1240         /* Buffer to buffer copy flags. */
1241         pc->copy_buffer_to_gf = 0;
1242
1243         if (!pc->refresh_golden_frame)
1244             pc->copy_buffer_to_gf = vp8_read_literal(bc, 2);
1245
1246 #if CONFIG_ERROR_CONCEALMENT
1247         /* Assume we shouldn't copy to the golden if the bit is missing */
1248         xd->corrupted |= vp8dx_bool_error(bc);
1249         if (pbi->ec_active && xd->corrupted)
1250             pc->copy_buffer_to_gf = 0;
1251 #endif
1252
1253         pc->copy_buffer_to_arf = 0;
1254
1255         if (!pc->refresh_alt_ref_frame)
1256             pc->copy_buffer_to_arf = vp8_read_literal(bc, 2);
1257
1258 #if CONFIG_ERROR_CONCEALMENT
1259         /* Assume we shouldn't copy to the alt-ref if the bit is missing */
1260         xd->corrupted |= vp8dx_bool_error(bc);
1261         if (pbi->ec_active && xd->corrupted)
1262             pc->copy_buffer_to_arf = 0;
1263 #endif
1264
1265
1266         pc->ref_frame_sign_bias[GOLDEN_FRAME] = vp8_read_bit(bc);
1267         pc->ref_frame_sign_bias[ALTREF_FRAME] = vp8_read_bit(bc);
1268     }
1269
1270     pc->refresh_entropy_probs = vp8_read_bit(bc);
1271 #if CONFIG_ERROR_CONCEALMENT
1272     /* Assume we shouldn't refresh the probabilities if the bit is
1273      * missing */
1274     xd->corrupted |= vp8dx_bool_error(bc);
1275     if (pbi->ec_active && xd->corrupted)
1276         pc->refresh_entropy_probs = 0;
1277 #endif
1278     if (pc->refresh_entropy_probs == 0)
1279     {
1280         vpx_memcpy(&pc->lfc, &pc->fc, sizeof(pc->fc));
1281     }
1282
1283     pc->refresh_last_frame = pc->frame_type == KEY_FRAME  ||  vp8_read_bit(bc);
1284
1285 #if CONFIG_ERROR_CONCEALMENT
1286     /* Assume we should refresh the last frame if the bit is missing */
1287     xd->corrupted |= vp8dx_bool_error(bc);
1288     if (pbi->ec_active && xd->corrupted)
1289         pc->refresh_last_frame = 1;
1290 #endif
1291
1292     if (0)
1293     {
1294         FILE *z = fopen("decodestats.stt", "a");
1295         fprintf(z, "%6d F:%d,G:%d,A:%d,L:%d,Q:%d\n",
1296                 pc->current_video_frame,
1297                 pc->frame_type,
1298                 pc->refresh_golden_frame,
1299                 pc->refresh_alt_ref_frame,
1300                 pc->refresh_last_frame,
1301                 pc->base_qindex);
1302         fclose(z);
1303     }
1304
1305     {
1306         pbi->independent_partitions = 1;
1307
1308         /* read coef probability tree */
1309         for (i = 0; i < BLOCK_TYPES; i++)
1310             for (j = 0; j < COEF_BANDS; j++)
1311                 for (k = 0; k < PREV_COEF_CONTEXTS; k++)
1312                     for (l = 0; l < ENTROPY_NODES; l++)
1313                     {
1314
1315                         vp8_prob *const p = pc->fc.coef_probs [i][j][k] + l;
1316
1317                         if (vp8_read(bc, vp8_coef_update_probs [i][j][k][l]))
1318                         {
1319                             *p = (vp8_prob)vp8_read_literal(bc, 8);
1320
1321                         }
1322                         if (k > 0 && *p != pc->fc.coef_probs[i][j][k-1][l])
1323                             pbi->independent_partitions = 0;
1324
1325                     }
1326     }
1327
1328     /* clear out the coeff buffer */
1329     vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
1330
1331     vp8_decode_mode_mvs(pbi);
1332
1333 #if CONFIG_ERROR_CONCEALMENT
1334     if (pbi->ec_active &&
1335             pbi->mvs_corrupt_from_mb < (unsigned int)pc->mb_cols * pc->mb_rows)
1336     {
1337         /* Motion vectors are missing in this frame. We will try to estimate
1338          * them and then continue decoding the frame as usual */
1339         vp8_estimate_missing_mvs(pbi);
1340     }
1341 #endif
1342
1343     vpx_memset(pc->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) * pc->mb_cols);
1344     pbi->frame_corrupt_residual = 0;
1345
1346 #if CONFIG_MULTITHREAD
1347     if (pbi->b_multithreaded_rd && pc->multi_token_partition != ONE_PARTITION)
1348     {
1349         unsigned int thread;
1350         vp8mt_decode_mb_rows(pbi, xd);
1351         vp8_yv12_extend_frame_borders(yv12_fb_new);
1352         for (thread = 0; thread < pbi->decoding_thread_count; ++thread)
1353             corrupt_tokens |= pbi->mb_row_di[thread].mbd.corrupted;
1354     }
1355     else
1356 #endif
1357     {
1358         decode_mb_rows(pbi);
1359         corrupt_tokens |= xd->corrupted;
1360     }
1361
1362     /* Collect information about decoder corruption. */
1363     /* 1. Check first boolean decoder for errors. */
1364     yv12_fb_new->corrupted = vp8dx_bool_error(bc);
1365     /* 2. Check the macroblock information */
1366     yv12_fb_new->corrupted |= corrupt_tokens;
1367
1368     if (!pbi->decoded_key_frame)
1369     {
1370         if (pc->frame_type == KEY_FRAME &&
1371             !yv12_fb_new->corrupted)
1372             pbi->decoded_key_frame = 1;
1373         else
1374             vpx_internal_error(&pbi->common.error, VPX_CODEC_CORRUPT_FRAME,
1375                                "A stream must start with a complete key frame");
1376     }
1377
1378     /* vpx_log("Decoder: Frame Decoded, Size Roughly:%d bytes  \n",bc->pos+pbi->bc2.pos); */
1379
1380     if (pc->refresh_entropy_probs == 0)
1381     {
1382         vpx_memcpy(&pc->fc, &pc->lfc, sizeof(pc->fc));
1383         pbi->independent_partitions = prev_independent_partitions;
1384     }
1385
1386 #ifdef PACKET_TESTING
1387     {
1388         FILE *f = fopen("decompressor.VP8", "ab");
1389         unsigned int size = pbi->bc2.pos + pbi->bc.pos + 8;
1390         fwrite((void *) &size, 4, 1, f);
1391         fwrite((void *) pbi->Source, size, 1, f);
1392         fclose(f);
1393     }
1394 #endif
1395
1396     return 0;
1397 }