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/invtrans.h"
  21 #include "vp8/common/alloccommon.h"
  22 #include "vp8/common/entropymode.h"
  23 #include "vp8/common/quant_common.h"
  24 #include "vpx_scale/vpx_scale.h"
  25 #include "vp8/common/setupintrarecon.h"
  26
  27 #include "decodemv.h"
  28 #include "vp8/common/extend.h"
  29 #if CONFIG_ERROR_CONCEALMENT
  30 #include "error_concealment.h"
  31 #endif
  32 #include "vpx_mem/vpx_mem.h"
  33 #include "vp8/common/threading.h"
  34 #include "decoderthreading.h"
  35 #include "dboolhuff.h"
  36
  37 #include <assert.h>
  38 #include <stdio.h>
  39
  40 void vp8cx_init_de_quantizer(VP8D_COMP *pbi)
  41 {
  42     int Q;
  43     VP8_COMMON *const pc = & pbi->common;
  44
  45     for (Q = 0; Q < QINDEX_RANGE; Q++)
  46     {
  47         pc->Y1dequant[Q][0] = (short)vp8_dc_quant(Q, pc->y1dc_delta_q);
  48         pc->Y2dequant[Q][0] = (short)vp8_dc2quant(Q, pc->y2dc_delta_q);
  49         pc->UVdequant[Q][0] = (short)vp8_dc_uv_quant(Q, pc->uvdc_delta_q);
  50
  51         pc->Y1dequant[Q][1] = (short)vp8_ac_yquant(Q);
  52         pc->Y2dequant[Q][1] = (short)vp8_ac2quant(Q, pc->y2ac_delta_q);
  53         pc->UVdequant[Q][1] = (short)vp8_ac_uv_quant(Q, pc->uvac_delta_q);
  54     }
  55 }
  56
  57 void vp8_mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
  58 {
  59     int i;
  60     int QIndex;
  61     MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
  62     VP8_COMMON *const pc = & pbi->common;
  63
  64     /* Decide whether to use the default or alternate baseline Q value. */
  65     if (xd->segmentation_enabled)
  66     {
  67         /* Abs Value */
  68         if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
  69             QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
  70
  71         /* Delta Value */
  72         else
  73         {
  74             QIndex = pc->base_qindex + xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
  75             QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0;    /* Clamp to valid range */
  76         }
  77     }
  78     else
  79         QIndex = pc->base_qindex;
  80
  81     /* Set up the macroblock dequant constants */
  82     xd->dequant_y1_dc[0] = 1;
  83     xd->dequant_y1[0] = pc->Y1dequant[QIndex][0];
  84     xd->dequant_y2[0] = pc->Y2dequant[QIndex][0];
  85     xd->dequant_uv[0] = pc->UVdequant[QIndex][0];
  86
  87     for (i = 1; i < 16; i++)
  88     {
  89         xd->dequant_y1_dc[i] =
  90         xd->dequant_y1[i] = pc->Y1dequant[QIndex][1];
  91         xd->dequant_y2[i] = pc->Y2dequant[QIndex][1];
  92         xd->dequant_uv[i] = pc->UVdequant[QIndex][1];
  93     }
  94 }
  95
  96 static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
  97                               unsigned int mb_idx)
  98 {
  99     MB_PREDICTION_MODE mode;
 100     int i;
 101 #if CONFIG_ERROR_CONCEALMENT
 102     int corruption_detected = 0;
 103 #endif
 104
 105     if (xd->mode_info_context->mbmi.mb_skip_coeff)
 106     {
 107         vp8_reset_mb_tokens_context(xd);
 108     }
 109     else if (!vp8dx_bool_error(xd->current_bc))
 110     {
 111         int eobtotal;
 112         eobtotal = vp8_decode_mb_tokens(pbi, xd);
 113
 114         /* Special case:  Force the loopfilter to skip when eobtotal is zero */
 115         xd->mode_info_context->mbmi.mb_skip_coeff = (eobtotal==0);
 116     }
 117
 118     mode = xd->mode_info_context->mbmi.mode;
 119
 120     if (xd->segmentation_enabled)
 121         vp8_mb_init_dequantizer(pbi, xd);
 122
 123
 124 #if CONFIG_ERROR_CONCEALMENT
 125
 126     if(pbi->ec_active)
 127     {
 128         int throw_residual;
 129         /* When we have independent partitions we can apply residual even
 130          * though other partitions within the frame are corrupt.
 131          */
 132         throw_residual = (!pbi->independent_partitions &&
 133                           pbi->frame_corrupt_residual);
 134         throw_residual = (throw_residual || vp8dx_bool_error(xd->current_bc));
 135
 136         if ((mb_idx >= pbi->mvs_corrupt_from_mb || throw_residual))
 137         {
 138             /* MB with corrupt residuals or corrupt mode/motion vectors.
 139              * Better to use the predictor as reconstruction.
 140              */
 141             pbi->frame_corrupt_residual = 1;
 142             vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
 143             vp8_conceal_corrupt_mb(xd);
 144
 145
 146             corruption_detected = 1;
 147
 148             /* force idct to be skipped for B_PRED and use the
 149              * prediction only for reconstruction
 150              * */
 151             vpx_memset(xd->eobs, 0, 25);
 152         }
 153     }
 154 #endif
 155
 156     /* do prediction */
 157     if (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME)
 158     {
 159         vp8_build_intra_predictors_mbuv_s(xd,
 160                                           xd->recon_above[1],
 161                                           xd->recon_above[2],
 162                                           xd->recon_left[1],
 163                                           xd->recon_left[2],
 164                                           xd->recon_left_stride[1],
 165                                           xd->dst.u_buffer, xd->dst.v_buffer,
 166                                           xd->dst.uv_stride);
 167
 168         if (mode != B_PRED)
 169         {
 170             vp8_build_intra_predictors_mby_s(xd,
 171                                                  xd->recon_above[0],
 172                                                  xd->recon_left[0],
 173                                                  xd->recon_left_stride[0],
 174                                                  xd->dst.y_buffer,
 175                                                  xd->dst.y_stride);
 176         }
 177         else
 178         {
 179             short *DQC = xd->dequant_y1;
 180             int dst_stride = xd->dst.y_stride;
 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                 unsigned char *dst = xd->dst.y_buffer + b->offset;
 192                 B_PREDICTION_MODE b_mode =
 193                     xd->mode_info_context->bmi[i].as_mode;
 194                 unsigned char *Above = dst - dst_stride;
 195                 unsigned char *yleft = dst - 1;
 196                 int left_stride = dst_stride;
 197                 unsigned char top_left = Above[-1];
 198
 199                 vp8_intra4x4_predict(Above, yleft, left_stride, b_mode,
 200                                      dst, dst_stride, top_left);
 201
 202                 if (xd->eobs[i])
 203                 {
 204                     if (xd->eobs[i] > 1)
 205                     {
 206                     vp8_dequant_idct_add(b->qcoeff, DQC, dst, dst_stride);
 207                     }
 208                     else
 209                     {
 210                         vp8_dc_only_idct_add
 211                             (b->qcoeff[0] * DQC[0],
 212                                 dst, dst_stride,
 213                                 dst, dst_stride);
 214                         vpx_memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));
 215                     }
 216                 }
 217             }
 218         }
 219     }
 220     else
 221     {
 222         vp8_build_inter_predictors_mb(xd);
 223     }
 224
 225
 226 #if CONFIG_ERROR_CONCEALMENT
 227     if (corruption_detected)
 228     {
 229         return;
 230     }
 231 #endif
 232
 233     if(!xd->mode_info_context->mbmi.mb_skip_coeff)
 234     {
 235         /* dequantization and idct */
 236         if (mode != B_PRED)
 237         {
 238             short *DQC = xd->dequant_y1;
 239
 240             if (mode != SPLITMV)
 241             {
 242                 BLOCKD *b = &xd->block[24];
 243
 244                 /* do 2nd order transform on the dc block */
 245                 if (xd->eobs[24] > 1)
 246                 {
 247                     vp8_dequantize_b(b, xd->dequant_y2);
 248
 249                     vp8_short_inv_walsh4x4(&b->dqcoeff[0],
 250                         xd->qcoeff);
 251                     vpx_memset(b->qcoeff, 0, 16 * sizeof(b->qcoeff[0]));
 252                 }
 253                 else
 254                 {
 255                     b->dqcoeff[0] = b->qcoeff[0] * xd->dequant_y2[0];
 256                     vp8_short_inv_walsh4x4_1(&b->dqcoeff[0],
 257                         xd->qcoeff);
 258                     vpx_memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));
 259                 }
 260
 261                 /* override the dc dequant constant in order to preserve the
 262                  * dc components
 263                  */
 264                 DQC = xd->dequant_y1_dc;
 265             }
 266
 267             vp8_dequant_idct_add_y_block
 268                             (xd->qcoeff, DQC,
 269                              xd->dst.y_buffer,
 270                              xd->dst.y_stride, xd->eobs);
 271         }
 272
 273         vp8_dequant_idct_add_uv_block
 274                         (xd->qcoeff+16*16, xd->dequant_uv,
 275                          xd->dst.u_buffer, xd->dst.v_buffer,
 276                          xd->dst.uv_stride, xd->eobs+16);
 277     }
 278 }
 279
 280 static int get_delta_q(vp8_reader *bc, int prev, int *q_update)
 281 {
 282     int ret_val = 0;
 283
 284     if (vp8_read_bit(bc))
 285     {
 286         ret_val = vp8_read_literal(bc, 4);
 287
 288         if (vp8_read_bit(bc))
 289             ret_val = -ret_val;
 290     }
 291
 292     /* Trigger a quantizer update if the delta-q value has changed */
 293     if (ret_val != prev)
 294         *q_update = 1;
 295
 296     return ret_val;
 297 }
 298
 299 #ifdef PACKET_TESTING
 300 #include <stdio.h>
 301 FILE *vpxlog = 0;
 302 #endif
 303
 304 static void yv12_extend_frame_top_c(YV12_BUFFER_CONFIG *ybf)
 305 {
 306     int i;
 307     unsigned char *src_ptr1;
 308     unsigned char *dest_ptr1;
 309
 310     unsigned int Border;
 311     int plane_stride;
 312
 313     /***********/
 314     /* Y Plane */
 315     /***********/
 316     Border = ybf->border;
 317     plane_stride = ybf->y_stride;
 318     src_ptr1 = ybf->y_buffer - Border;
 319     dest_ptr1 = src_ptr1 - (Border * plane_stride);
 320
 321     for (i = 0; i < (int)Border; i++)
 322     {
 323         vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
 324         dest_ptr1 += plane_stride;
 325     }
 326
 327
 328     /***********/
 329     /* U Plane */
 330     /***********/
 331     plane_stride = ybf->uv_stride;
 332     Border /= 2;
 333     src_ptr1 = ybf->u_buffer - Border;
 334     dest_ptr1 = src_ptr1 - (Border * plane_stride);
 335
 336     for (i = 0; i < (int)(Border); i++)
 337     {
 338         vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
 339         dest_ptr1 += plane_stride;
 340     }
 341
 342     /***********/
 343     /* V Plane */
 344     /***********/
 345
 346     src_ptr1 = ybf->v_buffer - Border;
 347     dest_ptr1 = src_ptr1 - (Border * plane_stride);
 348
 349     for (i = 0; i < (int)(Border); i++)
 350     {
 351         vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
 352         dest_ptr1 += plane_stride;
 353     }
 354 }
 355
 356 static void yv12_extend_frame_bottom_c(YV12_BUFFER_CONFIG *ybf)
 357 {
 358     int i;
 359     unsigned char *src_ptr1, *src_ptr2;
 360     unsigned char *dest_ptr2;
 361
 362     unsigned int Border;
 363     int plane_stride;
 364     int plane_height;
 365
 366     /***********/
 367     /* Y Plane */
 368     /***********/
 369     Border = ybf->border;
 370     plane_stride = ybf->y_stride;
 371     plane_height = ybf->y_height;
 372
 373     src_ptr1 = ybf->y_buffer - Border;
 374     src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
 375     dest_ptr2 = src_ptr2 + plane_stride;
 376
 377     for (i = 0; i < (int)Border; i++)
 378     {
 379         vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
 380         dest_ptr2 += plane_stride;
 381     }
 382
 383
 384     /***********/
 385     /* U Plane */
 386     /***********/
 387     plane_stride = ybf->uv_stride;
 388     plane_height = ybf->uv_height;
 389     Border /= 2;
 390
 391     src_ptr1 = ybf->u_buffer - Border;
 392     src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
 393     dest_ptr2 = src_ptr2 + plane_stride;
 394
 395     for (i = 0; i < (int)(Border); i++)
 396     {
 397         vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
 398         dest_ptr2 += plane_stride;
 399     }
 400
 401     /***********/
 402     /* V Plane */
 403     /***********/
 404
 405     src_ptr1 = ybf->v_buffer - Border;
 406     src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
 407     dest_ptr2 = src_ptr2 + plane_stride;
 408
 409     for (i = 0; i < (int)(Border); i++)
 410     {
 411         vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
 412         dest_ptr2 += plane_stride;
 413     }
 414 }
 415
 416 static void yv12_extend_frame_left_right_c(YV12_BUFFER_CONFIG *ybf,
 417                                            unsigned char *y_src,
 418                                            unsigned char *u_src,
 419                                            unsigned char *v_src)
 420 {
 421     int i;
 422     unsigned char *src_ptr1, *src_ptr2;
 423     unsigned char *dest_ptr1, *dest_ptr2;
 424
 425     unsigned int Border;
 426     int plane_stride;
 427     int plane_height;
 428     int plane_width;
 429
 430     /***********/
 431     /* Y Plane */
 432     /***********/
 433     Border = ybf->border;
 434     plane_stride = ybf->y_stride;
 435     plane_height = 16;
 436     plane_width = ybf->y_width;
 437
 438     /* copy the left and right most columns out */
 439     src_ptr1 = y_src;
 440     src_ptr2 = src_ptr1 + plane_width - 1;
 441     dest_ptr1 = src_ptr1 - Border;
 442     dest_ptr2 = src_ptr2 + 1;
 443
 444     for (i = 0; i < plane_height; i++)
 445     {
 446         vpx_memset(dest_ptr1, src_ptr1[0], Border);
 447         vpx_memset(dest_ptr2, src_ptr2[0], Border);
 448         src_ptr1  += plane_stride;
 449         src_ptr2  += plane_stride;
 450         dest_ptr1 += plane_stride;
 451         dest_ptr2 += plane_stride;
 452     }
 453
 454     /***********/
 455     /* U Plane */
 456     /***********/
 457     plane_stride = ybf->uv_stride;
 458     plane_height = 8;
 459     plane_width = ybf->uv_width;
 460     Border /= 2;
 461
 462     /* copy the left and right most columns out */
 463     src_ptr1 = u_src;
 464     src_ptr2 = src_ptr1 + plane_width - 1;
 465     dest_ptr1 = src_ptr1 - Border;
 466     dest_ptr2 = src_ptr2 + 1;
 467
 468     for (i = 0; i < plane_height; i++)
 469     {
 470         vpx_memset(dest_ptr1, src_ptr1[0], Border);
 471         vpx_memset(dest_ptr2, src_ptr2[0], Border);
 472         src_ptr1  += plane_stride;
 473         src_ptr2  += plane_stride;
 474         dest_ptr1 += plane_stride;
 475         dest_ptr2 += plane_stride;
 476     }
 477
 478     /***********/
 479     /* V Plane */
 480     /***********/
 481
 482     /* copy the left and right most columns out */
 483     src_ptr1 = v_src;
 484     src_ptr2 = src_ptr1 + plane_width - 1;
 485     dest_ptr1 = src_ptr1 - Border;
 486     dest_ptr2 = src_ptr2 + 1;
 487
 488     for (i = 0; i < plane_height; i++)
 489     {
 490         vpx_memset(dest_ptr1, src_ptr1[0], Border);
 491         vpx_memset(dest_ptr2, src_ptr2[0], Border);
 492         src_ptr1  += plane_stride;
 493         src_ptr2  += plane_stride;
 494         dest_ptr1 += plane_stride;
 495         dest_ptr2 += plane_stride;
 496     }
 497 }
 498
 499 static void decode_mb_rows(VP8D_COMP *pbi)
 500 {
 501     VP8_COMMON *const pc = & pbi->common;
 502     MACROBLOCKD *const xd  = & pbi->mb;
 503
 504     MODE_INFO *lf_mic = xd->mode_info_context;
 505
 506     int ibc = 0;
 507     int num_part = 1 << pc->multi_token_partition;
 508
 509     int recon_yoffset, recon_uvoffset;
 510     int mb_row, mb_col;
 511     int mb_idx = 0;
 512
 513     YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];
 514
 515     int recon_y_stride = yv12_fb_new->y_stride;
 516     int recon_uv_stride = yv12_fb_new->uv_stride;
 517
 518     unsigned char *ref_buffer[MAX_REF_FRAMES][3];
 519     unsigned char *dst_buffer[3];
 520     unsigned char *lf_dst[3];
 521     unsigned char *eb_dst[3];
 522     int i;
 523     int ref_fb_corrupted[MAX_REF_FRAMES];
 524
 525     ref_fb_corrupted[INTRA_FRAME] = 0;
 526
 527     for(i = 1; i < MAX_REF_FRAMES; i++)
 528     {
 529         YV12_BUFFER_CONFIG *this_fb = pbi->dec_fb_ref[i];
 530
 531         ref_buffer[i][0] = this_fb->y_buffer;
 532         ref_buffer[i][1] = this_fb->u_buffer;
 533         ref_buffer[i][2] = this_fb->v_buffer;
 534
 535         ref_fb_corrupted[i] = this_fb->corrupted;
 536     }
 537
 538     /* Set up the buffer pointers */
 539     eb_dst[0] = lf_dst[0] = dst_buffer[0] = yv12_fb_new->y_buffer;
 540     eb_dst[1] = lf_dst[1] = dst_buffer[1] = yv12_fb_new->u_buffer;
 541     eb_dst[2] = lf_dst[2] = dst_buffer[2] = yv12_fb_new->v_buffer;
 542
 543     xd->up_available = 0;
 544
 545     /* Initialize the loop filter for this frame. */
 546     if(pc->filter_level)
 547         vp8_loop_filter_frame_init(pc, xd, pc->filter_level);
 548
 549     vp8_setup_intra_recon_top_line(yv12_fb_new);
 550
 551     /* Decode the individual macro block */
 552     for (mb_row = 0; mb_row < pc->mb_rows; mb_row++)
 553     {
 554         if (num_part > 1)
 555         {
 556             xd->current_bc = & pbi->mbc[ibc];
 557             ibc++;
 558
 559             if (ibc == num_part)
 560                 ibc = 0;
 561         }
 562
 563         recon_yoffset = mb_row * recon_y_stride * 16;
 564         recon_uvoffset = mb_row * recon_uv_stride * 8;
 565
 566         /* reset contexts */
 567         xd->above_context = pc->above_context;
 568         vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
 569
 570         xd->left_available = 0;
 571
 572         xd->mb_to_top_edge = -((mb_row * 16) << 3);
 573         xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
 574
 575         xd->recon_above[0] = dst_buffer[0] + recon_yoffset;
 576         xd->recon_above[1] = dst_buffer[1] + recon_uvoffset;
 577         xd->recon_above[2] = dst_buffer[2] + recon_uvoffset;
 578
 579         xd->recon_left[0] = xd->recon_above[0] - 1;
 580         xd->recon_left[1] = xd->recon_above[1] - 1;
 581         xd->recon_left[2] = xd->recon_above[2] - 1;
 582
 583         xd->recon_above[0] -= xd->dst.y_stride;
 584         xd->recon_above[1] -= xd->dst.uv_stride;
 585         xd->recon_above[2] -= xd->dst.uv_stride;
 586
 587         /* TODO: move to outside row loop */
 588         xd->recon_left_stride[0] = xd->dst.y_stride;
 589         xd->recon_left_stride[1] = xd->dst.uv_stride;
 590
 591         setup_intra_recon_left(xd->recon_left[0], xd->recon_left[1],
 592                                xd->recon_left[2], xd->dst.y_stride,
 593                                xd->dst.uv_stride);
 594
 595         for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
 596         {
 597             /* Distance of Mb to the various image edges.
 598              * These are specified to 8th pel as they are always compared to values
 599              * that are in 1/8th pel units
 600              */
 601             xd->mb_to_left_edge = -((mb_col * 16) << 3);
 602             xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
 603
 604 #if CONFIG_ERROR_CONCEALMENT
 605             {
 606                 int corrupt_residual = (!pbi->independent_partitions &&
 607                                        pbi->frame_corrupt_residual) ||
 608                                        vp8dx_bool_error(xd->current_bc);
 609                 if (pbi->ec_active &&
 610                     xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME &&
 611                     corrupt_residual)
 612                 {
 613                     /* We have an intra block with corrupt coefficients, better to
 614                      * conceal with an inter block. Interpolate MVs from neighboring
 615                      * MBs.
 616                      *
 617                      * Note that for the first mb with corrupt residual in a frame,
 618                      * we might not discover that before decoding the residual. That
 619                      * happens after this check, and therefore no inter concealment
 620                      * will be done.
 621                      */
 622                     vp8_interpolate_motion(xd,
 623                                            mb_row, mb_col,
 624                                            pc->mb_rows, pc->mb_cols,
 625                                            pc->mode_info_stride);
 626                 }
 627             }
 628 #endif
 629
 630             xd->dst.y_buffer = dst_buffer[0] + recon_yoffset;
 631             xd->dst.u_buffer = dst_buffer[1] + recon_uvoffset;
 632             xd->dst.v_buffer = dst_buffer[2] + recon_uvoffset;
 633
 634             if (xd->mode_info_context->mbmi.ref_frame >= LAST_FRAME) {
 635               MV_REFERENCE_FRAME ref = xd->mode_info_context->mbmi.ref_frame;
 636               xd->pre.y_buffer = ref_buffer[ref][0] + recon_yoffset;
 637               xd->pre.u_buffer = ref_buffer[ref][1] + recon_uvoffset;
 638               xd->pre.v_buffer = ref_buffer[ref][2] + recon_uvoffset;
 639             } else {
 640               // ref_frame is INTRA_FRAME, pre buffer should not be used.
 641               xd->pre.y_buffer = 0;
 642               xd->pre.u_buffer = 0;
 643               xd->pre.v_buffer = 0;
 644             }
 645
 646             /* propagate errors from reference frames */
 647             xd->corrupted |= ref_fb_corrupted[xd->mode_info_context->mbmi.ref_frame];
 648
 649             decode_macroblock(pbi, xd, mb_idx);
 650
 651             mb_idx++;
 652             xd->left_available = 1;
 653
 654             /* check if the boolean decoder has suffered an error */
 655             xd->corrupted |= vp8dx_bool_error(xd->current_bc);
 656
 657             xd->recon_above[0] += 16;
 658             xd->recon_above[1] += 8;
 659             xd->recon_above[2] += 8;
 660             xd->recon_left[0] += 16;
 661             xd->recon_left[1] += 8;
 662             xd->recon_left[2] += 8;
 663
 664             recon_yoffset += 16;
 665             recon_uvoffset += 8;
 666
 667             ++xd->mode_info_context;  /* next mb */
 668
 669             xd->above_context++;
 670         }
 671
 672         /* adjust to the next row of mbs */
 673         vp8_extend_mb_row(yv12_fb_new, xd->dst.y_buffer + 16,
 674                           xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
 675
 676         ++xd->mode_info_context;      /* skip prediction column */
 677         xd->up_available = 1;
 678
 679         if(pc->filter_level)
 680         {
 681             if(mb_row > 0)
 682             {
 683                 if (pc->filter_type == NORMAL_LOOPFILTER)
 684                     vp8_loop_filter_row_normal(pc, lf_mic, mb_row-1,
 685                                                recon_y_stride, recon_uv_stride,
 686                                                lf_dst[0], lf_dst[1], lf_dst[2]);
 687                 else
 688                     vp8_loop_filter_row_simple(pc, lf_mic, mb_row-1,
 689                                                recon_y_stride, recon_uv_stride,
 690                                                lf_dst[0], lf_dst[1], lf_dst[2]);
 691                 if(mb_row > 1)
 692                 {
 693                     yv12_extend_frame_left_right_c(yv12_fb_new,
 694                                                    eb_dst[0],
 695                                                    eb_dst[1],
 696                                                    eb_dst[2]);
 697
 698                     eb_dst[0] += recon_y_stride  * 16;
 699                     eb_dst[1] += recon_uv_stride *  8;
 700                     eb_dst[2] += recon_uv_stride *  8;
 701                 }
 702
 703                 lf_dst[0] += recon_y_stride  * 16;
 704                 lf_dst[1] += recon_uv_stride *  8;
 705                 lf_dst[2] += recon_uv_stride *  8;
 706                 lf_mic += pc->mb_cols;
 707                 lf_mic++;         /* Skip border mb */
 708             }
 709         }
 710         else
 711         {
 712             if(mb_row > 0)
 713             {
 714                 /**/
 715                 yv12_extend_frame_left_right_c(yv12_fb_new,
 716                                                eb_dst[0],
 717                                                eb_dst[1],
 718                                                eb_dst[2]);
 719                 eb_dst[0] += recon_y_stride  * 16;
 720                 eb_dst[1] += recon_uv_stride *  8;
 721                 eb_dst[2] += recon_uv_stride *  8;
 722             }
 723         }
 724     }
 725
 726     if(pc->filter_level)
 727     {
 728         if (pc->filter_type == NORMAL_LOOPFILTER)
 729             vp8_loop_filter_row_normal(pc, lf_mic, mb_row-1, recon_y_stride,
 730                                        recon_uv_stride, lf_dst[0], lf_dst[1],
 731                                        lf_dst[2]);
 732         else
 733             vp8_loop_filter_row_simple(pc, lf_mic, mb_row-1, recon_y_stride,
 734                                        recon_uv_stride, lf_dst[0], lf_dst[1],
 735                                        lf_dst[2]);
 736
 737         yv12_extend_frame_left_right_c(yv12_fb_new,
 738                                        eb_dst[0],
 739                                        eb_dst[1],
 740                                        eb_dst[2]);
 741         eb_dst[0] += recon_y_stride  * 16;
 742         eb_dst[1] += recon_uv_stride *  8;
 743         eb_dst[2] += recon_uv_stride *  8;
 744     }
 745     yv12_extend_frame_left_right_c(yv12_fb_new,
 746                                    eb_dst[0],
 747                                    eb_dst[1],
 748                                    eb_dst[2]);
 749     yv12_extend_frame_top_c(yv12_fb_new);
 750     yv12_extend_frame_bottom_c(yv12_fb_new);
 751
 752 }
 753
 754 static unsigned int read_partition_size(VP8D_COMP *pbi,
 755                                         const unsigned char *cx_size)
 756 {
 757     unsigned char temp[3];
 758     if (pbi->decrypt_cb)
 759     {
 760         pbi->decrypt_cb(pbi->decrypt_state, cx_size, temp, 3);
 761         cx_size = temp;
 762     }
 763     return cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);
 764 }
 765
 766 static int read_is_valid(const unsigned char *start,
 767                          size_t               len,
 768                          const unsigned char *end)
 769 {
 770     return (start + len > start && start + len <= end);
 771 }
 772
 773 static unsigned int read_available_partition_size(
 774                                        VP8D_COMP *pbi,
 775                                        const unsigned char *token_part_sizes,
 776                                        const unsigned char *fragment_start,
 777                                        const unsigned char *first_fragment_end,
 778                                        const unsigned char *fragment_end,
 779                                        int i,
 780                                        int num_part)
 781 {
 782     VP8_COMMON* pc = &pbi->common;
 783     const unsigned char *partition_size_ptr = token_part_sizes + i * 3;
 784     unsigned int partition_size = 0;
 785     ptrdiff_t bytes_left = fragment_end - fragment_start;
 786     /* Calculate the length of this partition. The last partition
 787      * size is implicit. If the partition size can't be read, then
 788      * either use the remaining data in the buffer (for EC mode)
 789      * or throw an error.
 790      */
 791     if (i < num_part - 1)
 792     {
 793         if (read_is_valid(partition_size_ptr, 3, first_fragment_end))
 794             partition_size = read_partition_size(pbi, partition_size_ptr);
 795         else if (pbi->ec_active)
 796             partition_size = (unsigned int)bytes_left;
 797         else
 798             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 799                                "Truncated partition size data");
 800     }
 801     else
 802         partition_size = (unsigned int)bytes_left;
 803
 804     /* Validate the calculated partition length. If the buffer
 805      * described by the partition can't be fully read, then restrict
 806      * it to the portion that can be (for EC mode) or throw an error.
 807      */
 808     if (!read_is_valid(fragment_start, partition_size, fragment_end))
 809     {
 810         if (pbi->ec_active)
 811             partition_size = (unsigned int)bytes_left;
 812         else
 813             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
 814                                "Truncated packet or corrupt partition "
 815                                "%d length", i + 1);
 816     }
 817     return partition_size;
 818 }
 819
 820
 821 static void setup_token_decoder(VP8D_COMP *pbi,
 822                                 const unsigned char* token_part_sizes)
 823 {
 824     vp8_reader *bool_decoder = &pbi->mbc[0];
 825     unsigned int partition_idx;
 826     unsigned int fragment_idx;
 827     unsigned int num_token_partitions;
 828     const unsigned char *first_fragment_end = pbi->fragments.ptrs[0] +
 829                                           pbi->fragments.sizes[0];
 830
 831     TOKEN_PARTITION multi_token_partition =
 832             (TOKEN_PARTITION)vp8_read_literal(&pbi->mbc[8], 2);
 833     if (!vp8dx_bool_error(&pbi->mbc[8]))
 834         pbi->common.multi_token_partition = multi_token_partition;
 835     num_token_partitions = 1 << pbi->common.multi_token_partition;
 836
 837     /* Check for partitions within the fragments and unpack the fragments
 838      * so that each fragment pointer points to its corresponding partition. */
 839     for (fragment_idx = 0; fragment_idx < pbi->fragments.count; ++fragment_idx)
 840     {
 841         unsigned int fragment_size = pbi->fragments.sizes[fragment_idx];
 842         const unsigned char *fragment_end = pbi->fragments.ptrs[fragment_idx] +
 843                                             fragment_size;
 844         /* Special case for handling the first partition since we have already
 845          * read its size. */
 846         if (fragment_idx == 0)
 847         {
 848             /* Size of first partition + token partition sizes element */
 849             ptrdiff_t ext_first_part_size = token_part_sizes -
 850                 pbi->fragments.ptrs[0] + 3 * (num_token_partitions - 1);
 851             fragment_size -= (unsigned int)ext_first_part_size;
 852             if (fragment_size > 0)
 853             {
 854                 pbi->fragments.sizes[0] = (unsigned int)ext_first_part_size;
 855                 /* The fragment contains an additional partition. Move to
 856                  * next. */
 857                 fragment_idx++;
 858                 pbi->fragments.ptrs[fragment_idx] = pbi->fragments.ptrs[0] +
 859                   pbi->fragments.sizes[0];
 860             }
 861         }
 862         /* Split the chunk into partitions read from the bitstream */
 863         while (fragment_size > 0)
 864         {
 865             ptrdiff_t partition_size = read_available_partition_size(
 866                                                  pbi,
 867                                                  token_part_sizes,
 868                                                  pbi->fragments.ptrs[fragment_idx],
 869                                                  first_fragment_end,
 870                                                  fragment_end,
 871                                                  fragment_idx - 1,
 872                                                  num_token_partitions);
 873             pbi->fragments.sizes[fragment_idx] = (unsigned int)partition_size;
 874             fragment_size -= (unsigned int)partition_size;
 875             assert(fragment_idx <= num_token_partitions);
 876             if (fragment_size > 0)
 877             {
 878                 /* The fragment contains an additional partition.
 879                  * Move to next. */
 880                 fragment_idx++;
 881                 pbi->fragments.ptrs[fragment_idx] =
 882                     pbi->fragments.ptrs[fragment_idx - 1] + partition_size;
 883             }
 884         }
 885     }
 886
 887     pbi->fragments.count = num_token_partitions + 1;
 888
 889     for (partition_idx = 1; partition_idx < pbi->fragments.count; ++partition_idx)
 890     {
 891         if (vp8dx_start_decode(bool_decoder,
 892                                pbi->fragments.ptrs[partition_idx],
 893                                pbi->fragments.sizes[partition_idx],
 894                                pbi->decrypt_cb, pbi->decrypt_state))
 895             vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,
 896                                "Failed to allocate bool decoder %d",
 897                                partition_idx);
 898
 899         bool_decoder++;
 900     }
 901
 902 #if CONFIG_MULTITHREAD
 903     /* Clamp number of decoder threads */
 904     if (pbi->decoding_thread_count > num_token_partitions - 1)
 905         pbi->decoding_thread_count = num_token_partitions - 1;
 906 #endif
 907 }
 908
 909
 910 static void init_frame(VP8D_COMP *pbi)
 911 {
 912     VP8_COMMON *const pc = & pbi->common;
 913     MACROBLOCKD *const xd  = & pbi->mb;
 914
 915     if (pc->frame_type == KEY_FRAME)
 916     {
 917         /* Various keyframe initializations */
 918         vpx_memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
 919
 920         vp8_init_mbmode_probs(pc);
 921
 922         vp8_default_coef_probs(pc);
 923
 924         /* reset the segment feature data to 0 with delta coding (Default state). */
 925         vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
 926         xd->mb_segement_abs_delta = SEGMENT_DELTADATA;
 927
 928         /* reset the mode ref deltasa for loop filter */
 929         vpx_memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));
 930         vpx_memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));
 931
 932         /* All buffers are implicitly updated on key frames. */
 933         pc->refresh_golden_frame = 1;
 934         pc->refresh_alt_ref_frame = 1;
 935         pc->copy_buffer_to_gf = 0;
 936         pc->copy_buffer_to_arf = 0;
 937
 938         /* Note that Golden and Altref modes cannot be used on a key frame so
 939          * ref_frame_sign_bias[] is undefined and meaningless
 940          */
 941         pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;
 942         pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;
 943     }
 944     else
 945     {
 946         /* To enable choice of different interploation filters */
 947         if (!pc->use_bilinear_mc_filter)
 948         {
 949             xd->subpixel_predict        = vp8_sixtap_predict4x4;
 950             xd->subpixel_predict8x4     = vp8_sixtap_predict8x4;
 951             xd->subpixel_predict8x8     = vp8_sixtap_predict8x8;
 952             xd->subpixel_predict16x16   = vp8_sixtap_predict16x16;
 953         }
 954         else
 955         {
 956             xd->subpixel_predict        = vp8_bilinear_predict4x4;
 957             xd->subpixel_predict8x4     = vp8_bilinear_predict8x4;
 958             xd->subpixel_predict8x8     = vp8_bilinear_predict8x8;
 959             xd->subpixel_predict16x16   = vp8_bilinear_predict16x16;
 960         }
 961
 962         if (pbi->decoded_key_frame && pbi->ec_enabled && !pbi->ec_active)
 963             pbi->ec_active = 1;
 964     }
 965
 966     xd->left_context = &pc->left_context;
 967     xd->mode_info_context = pc->mi;
 968     xd->frame_type = pc->frame_type;
 969     xd->mode_info_context->mbmi.mode = DC_PRED;
 970     xd->mode_info_stride = pc->mode_info_stride;
 971     xd->corrupted = 0; /* init without corruption */
 972
 973     xd->fullpixel_mask = 0xffffffff;
 974     if(pc->full_pixel)
 975         xd->fullpixel_mask = 0xfffffff8;
 976
 977 }
 978
 979 int vp8_decode_frame(VP8D_COMP *pbi)
 980 {
 981     vp8_reader *const bc = &pbi->mbc[8];
 982     VP8_COMMON *const pc = &pbi->common;
 983     MACROBLOCKD *const xd  = &pbi->mb;
 984     const unsigned char *data = pbi->fragments.ptrs[0];
 985     const unsigned char *data_end =  data + pbi->fragments.sizes[0];
 986     ptrdiff_t first_partition_length_in_bytes;
 987
 988     int i, j, k, l;
 989     const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;
 990     int corrupt_tokens = 0;
 991     int prev_independent_partitions = pbi->independent_partitions;
 992
 993     YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];
 994
 995     /* start with no corruption of current frame */
 996     xd->corrupted = 0;
 997     yv12_fb_new->corrupted = 0;
 998
 999     if (data_end - data < 3)
1000     {
1001         if (!pbi->ec_active)
1002         {
1003             vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
1004                                "Truncated packet");
1005         }
1006
1007         /* Declare the missing frame as an inter frame since it will
1008            be handled as an inter frame when we have estimated its
1009            motion vectors. */
1010         pc->frame_type = INTER_FRAME;
1011         pc->version = 0;
1012         pc->show_frame = 1;
1013         first_partition_length_in_bytes = 0;
1014     }
1015     else
1016     {
1017         unsigned char clear_buffer[10];
1018         const unsigned char *clear = data;
1019         if (pbi->decrypt_cb)
1020         {
1021             int n = (int)(data_end - data);
1022             if (n > 10) n = 10;
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 }