2 * Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
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.
12 #include "onyxd_int.h"
14 #include "reconintra.h"
15 #include "reconintra4x4.h"
17 #include "reconinter.h"
18 #include "dequantize.h"
19 #include "detokenize.h"
21 #include "alloccommon.h"
22 #include "entropymode.h"
23 #include "quant_common.h"
24 #include "segmentation_common.h"
25 #include "setupintrarecon.h"
29 #include "vpx_mem/vpx_mem.h"
31 #include "dequantize.h"
32 #include "predictdc.h"
33 #include "threading.h"
34 #include "decoderthreading.h"
35 #include "dboolhuff.h"
40 void vp8cx_init_de_quantizer(VP8D_COMP *pbi)
45 VP8_COMMON *const pc = & pbi->common;
47 for (Q = 0; Q < QINDEX_RANGE; Q++)
49 pc->Y1dequant[Q][0][0] = (short)vp8_dc_quant(Q, pc->y1dc_delta_q);
50 pc->Y2dequant[Q][0][0] = (short)vp8_dc2quant(Q, pc->y2dc_delta_q);
51 pc->UVdequant[Q][0][0] = (short)vp8_dc_uv_quant(Q, pc->uvdc_delta_q);
53 // all the ac values = ;
54 for (i = 1; i < 16; i++)
56 int rc = vp8_default_zig_zag1d[i];
60 pc->Y1dequant[Q][r][c] = (short)vp8_ac_yquant(Q);
61 pc->Y2dequant[Q][r][c] = (short)vp8_ac2quant(Q, pc->y2ac_delta_q);
62 pc->UVdequant[Q][r][c] = (short)vp8_ac_uv_quant(Q, pc->uvac_delta_q);
67 static void mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
71 MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
72 VP8_COMMON *const pc = & pbi->common;
74 // Decide whether to use the default or alternate baseline Q value.
75 if (xd->segmentation_enabled)
78 if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
79 QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
84 QIndex = pc->base_qindex + xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
85 QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0; // Clamp to valid range
89 QIndex = pc->base_qindex;
91 // Set up the block level dequant pointers
92 for (i = 0; i < 16; i++)
94 xd->block[i].dequant = pc->Y1dequant[QIndex];
97 for (i = 16; i < 24; i++)
99 xd->block[i].dequant = pc->UVdequant[QIndex];
102 xd->block[24].dequant = pc->Y2dequant[QIndex];
106 #if CONFIG_RUNTIME_CPU_DETECT
107 #define RTCD_VTABLE(x) (&(pbi)->common.rtcd.x)
109 #define RTCD_VTABLE(x) NULL
112 //skip_recon_mb() is Modified: Instead of writing the result to predictor buffer and then copying it
113 // to dst buffer, we can write the result directly to dst buffer. This eliminates unnecessary copy.
114 static void skip_recon_mb(VP8D_COMP *pbi, MACROBLOCKD *xd)
116 if (xd->frame_type == KEY_FRAME || xd->mbmi.ref_frame == INTRA_FRAME)
119 vp8_build_intra_predictors_mbuv_s(xd);
120 vp8_build_intra_predictors_mby_s_ptr(xd);
125 vp8_build_inter_predictors_mb_s(xd);
130 static void clamp_mv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
132 /* If the MV points so far into the UMV border that no visible pixels
133 * are used for reconstruction, the subpel part of the MV can be
134 * discarded and the MV limited to 16 pixels with equivalent results.
136 * This limit kicks in at 19 pixels for the top and left edges, for
137 * the 16 pixels plus 3 taps right of the central pixel when subpel
138 * filtering. The bottom and right edges use 16 pixels plus 2 pixels
139 * left of the central pixel when filtering.
141 if (mv->col < (xd->mb_to_left_edge - (19 << 3)))
142 mv->col = xd->mb_to_left_edge - (16 << 3);
143 else if (mv->col > xd->mb_to_right_edge + (18 << 3))
144 mv->col = xd->mb_to_right_edge + (16 << 3);
146 if (mv->row < (xd->mb_to_top_edge - (19 << 3)))
147 mv->row = xd->mb_to_top_edge - (16 << 3);
148 else if (mv->row > xd->mb_to_bottom_edge + (18 << 3))
149 mv->row = xd->mb_to_bottom_edge + (16 << 3);
152 /* A version of the above function for chroma block MVs.*/
153 static void clamp_uvmv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
155 if (2*mv->col < (xd->mb_to_left_edge - (19 << 3)))
156 mv->col = (xd->mb_to_left_edge - (16 << 3)) >> 1;
157 else if (2*mv->col > xd->mb_to_right_edge + (18 << 3))
158 mv->col = (xd->mb_to_right_edge + (16 << 3)) >> 1;
160 if (2*mv->row < (xd->mb_to_top_edge - (19 << 3)))
161 mv->row = (xd->mb_to_top_edge - (16 << 3)) >> 1;
162 else if (2*mv->row > xd->mb_to_bottom_edge + (18 << 3))
163 mv->row = (xd->mb_to_bottom_edge + (16 << 3)) >> 1;
166 static void clamp_mvs(MACROBLOCKD *xd)
168 if (xd->mbmi.mode == SPLITMV)
173 clamp_mv_to_umv_border(&xd->block[i].bmi.mv.as_mv, xd);
174 for (i=16; i<24; i++)
175 clamp_uvmv_to_umv_border(&xd->block[i].bmi.mv.as_mv, xd);
179 clamp_mv_to_umv_border(&xd->mbmi.mv.as_mv, xd);
180 clamp_uvmv_to_umv_border(&xd->block[16].bmi.mv.as_mv, xd);
185 static void reconstruct_mb(VP8D_COMP *pbi, MACROBLOCKD *xd)
187 if (xd->frame_type == KEY_FRAME || xd->mbmi.ref_frame == INTRA_FRAME)
189 vp8_build_intra_predictors_mbuv(xd);
191 if (xd->mbmi.mode != B_PRED)
193 vp8_build_intra_predictors_mby_ptr(xd);
194 vp8_recon16x16mb(RTCD_VTABLE(recon), xd);
198 vp8_recon_intra4x4mb(RTCD_VTABLE(recon), xd);
203 vp8_build_inter_predictors_mb(xd);
204 vp8_recon16x16mb(RTCD_VTABLE(recon), xd);
209 static void de_quantand_idct(VP8D_COMP *pbi, MACROBLOCKD *xd)
212 BLOCKD *b = &xd->block[24];
215 if (xd->mbmi.mode != B_PRED && xd->mbmi.mode != SPLITMV)
217 DEQUANT_INVOKE(&pbi->dequant, block)(b);
219 // do 2nd order transform on the dc block
222 IDCT_INVOKE(RTCD_VTABLE(idct), iwalsh16)(&b->dqcoeff[0], b->diff);
223 ((int *)b->qcoeff)[0] = 0;
224 ((int *)b->qcoeff)[1] = 0;
225 ((int *)b->qcoeff)[2] = 0;
226 ((int *)b->qcoeff)[3] = 0;
227 ((int *)b->qcoeff)[4] = 0;
228 ((int *)b->qcoeff)[5] = 0;
229 ((int *)b->qcoeff)[6] = 0;
230 ((int *)b->qcoeff)[7] = 0;
234 IDCT_INVOKE(RTCD_VTABLE(idct), iwalsh1)(&b->dqcoeff[0], b->diff);
235 ((int *)b->qcoeff)[0] = 0;
239 for (i = 0; i < 16; i++)
246 DEQUANT_INVOKE(&pbi->dequant, idct_dc)(b->qcoeff, &b->dequant[0][0], b->diff, 32, xd->block[24].diff[i]);
250 IDCT_INVOKE(RTCD_VTABLE(idct), idct1_scalar)(xd->block[24].diff[i], b->diff, 32);
254 for (i = 16; i < 24; i++)
260 DEQUANT_INVOKE(&pbi->dequant, idct)(b->qcoeff, &b->dequant[0][0], b->diff, 16);
264 IDCT_INVOKE(RTCD_VTABLE(idct), idct1_scalar)(b->qcoeff[0] * b->dequant[0][0], b->diff, 16);
265 ((int *)b->qcoeff)[0] = 0;
271 for (i = 0; i < 24; i++)
278 DEQUANT_INVOKE(&pbi->dequant, idct)(b->qcoeff, &b->dequant[0][0], b->diff, (32 - (i & 16)));
282 IDCT_INVOKE(RTCD_VTABLE(idct), idct1_scalar)(b->qcoeff[0] * b->dequant[0][0], b->diff, (32 - (i & 16)));
283 ((int *)b->qcoeff)[0] = 0;
289 void vp8_decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd)
293 int i, do_clamp = xd->mbmi.need_to_clamp_mvs;
295 if (xd->mbmi.mb_skip_coeff)
297 vp8_reset_mb_tokens_context(xd);
301 eobtotal = vp8_decode_mb_tokens(pbi, xd);
304 /* Perform temporary clamping of the MV to be used for prediction */
307 if (xd->mbmi.mode == SPLITMV)
309 orig_mvs[i] = xd->block[i].bmi.mv.as_mv;
312 orig_mvs[0] = xd->mbmi.mv.as_mv;
313 orig_mvs[1] = xd->block[16].bmi.mv.as_mv;
318 xd->mode_info_context->mbmi.dc_diff = 1;
320 if (xd->mbmi.mode != B_PRED && xd->mbmi.mode != SPLITMV && eobtotal == 0)
322 xd->mode_info_context->mbmi.dc_diff = 0;
323 skip_recon_mb(pbi, xd);
327 if (xd->segmentation_enabled)
328 mb_init_dequantizer(pbi, xd);
330 de_quantand_idct(pbi, xd);
331 reconstruct_mb(pbi, xd);
335 /* Restore the original MV so as not to affect the entropy context. */
338 if (xd->mbmi.mode == SPLITMV)
340 xd->block[i].bmi.mv.as_mv = orig_mvs[i];
343 xd->mbmi.mv.as_mv = orig_mvs[0];
344 xd->block[16].bmi.mv.as_mv = orig_mvs[1];
349 static int get_delta_q(vp8_reader *bc, int prev, int *q_update)
353 if (vp8_read_bit(bc))
355 ret_val = vp8_read_literal(bc, 4);
357 if (vp8_read_bit(bc))
361 /* Trigger a quantizer update if the delta-q value has changed */
368 #ifdef PACKET_TESTING
375 void vp8_decode_mb_row(VP8D_COMP *pbi,
382 int recon_yoffset, recon_uvoffset;
384 int ref_fb_idx = pc->lst_fb_idx;
385 int dst_fb_idx = pc->new_fb_idx;
386 int recon_y_stride = pc->yv12_fb[ref_fb_idx].y_stride;
387 int recon_uv_stride = pc->yv12_fb[ref_fb_idx].uv_stride;
389 vpx_memset(pc->left_context, 0, sizeof(pc->left_context));
390 recon_yoffset = mb_row * recon_y_stride * 16;
391 recon_uvoffset = mb_row * recon_uv_stride * 8;
392 // reset above block coeffs
394 xd->above_context[Y1CONTEXT] = pc->above_context[Y1CONTEXT];
395 xd->above_context[UCONTEXT ] = pc->above_context[UCONTEXT];
396 xd->above_context[VCONTEXT ] = pc->above_context[VCONTEXT];
397 xd->above_context[Y2CONTEXT] = pc->above_context[Y2CONTEXT];
398 xd->up_available = (mb_row != 0);
400 xd->mb_to_top_edge = -((mb_row * 16)) << 3;
401 xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
403 for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
405 // Take a copy of the mode and Mv information for this macroblock into the xd->mbmi
406 // the partition_bmi array is unused in the decoder, so don't copy it.
407 vpx_memcpy(&xd->mbmi, &xd->mode_info_context->mbmi,
408 sizeof(MB_MODE_INFO) - sizeof(xd->mbmi.partition_bmi));
410 if (xd->mbmi.mode == SPLITMV || xd->mbmi.mode == B_PRED)
412 for (i = 0; i < 16; i++)
414 BLOCKD *d = &xd->block[i];
415 vpx_memcpy(&d->bmi, &xd->mode_info_context->bmi[i], sizeof(B_MODE_INFO));
419 // Distance of Mb to the various image edges.
420 // These specified to 8th pel as they are always compared to values that are in 1/8th pel units
421 xd->mb_to_left_edge = -((mb_col * 16) << 3);
422 xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
424 xd->dst.y_buffer = pc->yv12_fb[dst_fb_idx].y_buffer + recon_yoffset;
425 xd->dst.u_buffer = pc->yv12_fb[dst_fb_idx].u_buffer + recon_uvoffset;
426 xd->dst.v_buffer = pc->yv12_fb[dst_fb_idx].v_buffer + recon_uvoffset;
428 xd->left_available = (mb_col != 0);
430 // Select the appropriate reference frame for this MB
431 if (xd->mbmi.ref_frame == LAST_FRAME)
432 ref_fb_idx = pc->lst_fb_idx;
433 else if (xd->mbmi.ref_frame == GOLDEN_FRAME)
434 ref_fb_idx = pc->gld_fb_idx;
436 ref_fb_idx = pc->alt_fb_idx;
438 xd->pre.y_buffer = pc->yv12_fb[ref_fb_idx].y_buffer + recon_yoffset;
439 xd->pre.u_buffer = pc->yv12_fb[ref_fb_idx].u_buffer + recon_uvoffset;
440 xd->pre.v_buffer = pc->yv12_fb[ref_fb_idx].v_buffer + recon_uvoffset;
442 vp8_build_uvmvs(xd, pc->full_pixel);
445 if(pc->current_video_frame==0 &&mb_col==1 && mb_row==0)
450 vp8_decode_macroblock(pbi, xd);
456 ++xd->mode_info_context; /* next mb */
458 xd->gf_active_ptr++; // GF useage flag for next MB
460 xd->above_context[Y1CONTEXT] += 4;
461 xd->above_context[UCONTEXT ] += 2;
462 xd->above_context[VCONTEXT ] += 2;
463 xd->above_context[Y2CONTEXT] ++;
465 pbi->current_mb_col_main = mb_col;
468 // adjust to the next row of mbs
470 &pc->yv12_fb[dst_fb_idx],
471 xd->dst.y_buffer + 16, xd->dst.u_buffer + 8, xd->dst.v_buffer + 8
474 ++xd->mode_info_context; /* skip prediction column */
476 pbi->last_mb_row_decoded = mb_row;
480 static unsigned int read_partition_size(const unsigned char *cx_size)
482 const unsigned int size =
483 cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);
488 static void setup_token_decoder(VP8D_COMP *pbi,
489 const unsigned char *cx_data)
493 VP8_COMMON *pc = &pbi->common;
494 const unsigned char *user_data_end = pbi->Source + pbi->source_sz;
495 vp8_reader *bool_decoder;
496 const unsigned char *partition;
498 /* Parse number of token partitions to use */
499 pc->multi_token_partition = (TOKEN_PARTITION)vp8_read_literal(&pbi->bc, 2);
500 num_part = 1 << pc->multi_token_partition;
502 /* Set up pointers to the first partition */
504 bool_decoder = &pbi->bc2;
508 CHECK_MEM_ERROR(pbi->mbc, vpx_malloc(num_part * sizeof(vp8_reader)));
509 bool_decoder = pbi->mbc;
510 partition += 3 * (num_part - 1);
513 for (i = 0; i < num_part; i++)
515 const unsigned char *partition_size_ptr = cx_data + i * 3;
516 unsigned int partition_size;
518 /* Calculate the length of this partition. The last partition
521 if (i < num_part - 1)
523 partition_size = read_partition_size(partition_size_ptr);
527 partition_size = user_data_end - partition;
530 if (partition + partition_size > user_data_end)
531 vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
532 "Truncated packet or corrupt partition "
535 if (vp8dx_start_decode(bool_decoder, IF_RTCD(&pbi->dboolhuff),
536 partition, partition_size))
537 vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
538 "Failed to allocate bool decoder %d", i + 1);
540 /* Advance to the next partition */
541 partition += partition_size;
545 /* Clamp number of decoder threads */
546 if (pbi->decoding_thread_count > num_part - 1)
547 pbi->decoding_thread_count = num_part - 1;
551 static void stop_token_decoder(VP8D_COMP *pbi)
554 VP8_COMMON *pc = &pbi->common;
556 if (pc->multi_token_partition != ONE_PARTITION)
560 static void init_frame(VP8D_COMP *pbi)
562 VP8_COMMON *const pc = & pbi->common;
563 MACROBLOCKD *const xd = & pbi->mb;
565 if (pc->frame_type == KEY_FRAME)
567 // Various keyframe initializations
568 vpx_memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
570 vp8_init_mbmode_probs(pc);
572 vp8_default_coef_probs(pc);
573 vp8_kf_default_bmode_probs(pc->kf_bmode_prob);
575 // reset the segment feature data to 0 with delta coding (Default state).
576 vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
577 xd->mb_segement_abs_delta = SEGMENT_DELTADATA;
579 // reset the mode ref deltasa for loop filter
580 vpx_memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));
581 vpx_memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));
583 // All buffers are implicitly updated on key frames.
584 pc->refresh_golden_frame = 1;
585 pc->refresh_alt_ref_frame = 1;
586 pc->copy_buffer_to_gf = 0;
587 pc->copy_buffer_to_arf = 0;
589 // Note that Golden and Altref modes cannot be used on a key frame so
590 // ref_frame_sign_bias[] is undefined and meaningless
591 pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;
592 pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;
596 if (!pc->use_bilinear_mc_filter)
597 pc->mcomp_filter_type = SIXTAP;
599 pc->mcomp_filter_type = BILINEAR;
601 // To enable choice of different interploation filters
602 if (pc->mcomp_filter_type == SIXTAP)
604 xd->subpixel_predict = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap4x4);
605 xd->subpixel_predict8x4 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap8x4);
606 xd->subpixel_predict8x8 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap8x8);
607 xd->subpixel_predict16x16 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap16x16);
611 xd->subpixel_predict = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear4x4);
612 xd->subpixel_predict8x4 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear8x4);
613 xd->subpixel_predict8x8 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear8x8);
614 xd->subpixel_predict16x16 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear16x16);
618 xd->left_context = pc->left_context;
619 xd->mode_info_context = pc->mi;
620 xd->frame_type = pc->frame_type;
621 xd->mbmi.mode = DC_PRED;
622 xd->mode_info_stride = pc->mode_info_stride;
625 int vp8_decode_frame(VP8D_COMP *pbi)
627 vp8_reader *const bc = & pbi->bc;
628 VP8_COMMON *const pc = & pbi->common;
629 MACROBLOCKD *const xd = & pbi->mb;
630 const unsigned char *data = (const unsigned char *)pbi->Source;
631 const unsigned char *const data_end = data + pbi->source_sz;
632 int first_partition_length_in_bytes;
636 const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;
638 pc->frame_type = (FRAME_TYPE)(data[0] & 1);
639 pc->version = (data[0] >> 1) & 7;
640 pc->show_frame = (data[0] >> 4) & 1;
641 first_partition_length_in_bytes =
642 (data[0] | (data[1] << 8) | (data[2] << 16)) >> 5;
645 if (data + first_partition_length_in_bytes > data_end)
646 vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
647 "Truncated packet or corrupt partition 0 length");
648 vp8_setup_version(pc);
650 if (pc->frame_type == KEY_FRAME)
652 const int Width = pc->Width;
653 const int Height = pc->Height;
656 if (data[0] != 0x9d || data[1] != 0x01 || data[2] != 0x2a)
657 vpx_internal_error(&pc->error, VPX_CODEC_UNSUP_BITSTREAM,
658 "Invalid frame sync code");
660 pc->Width = (data[3] | (data[4] << 8)) & 0x3fff;
661 pc->horiz_scale = data[4] >> 6;
662 pc->Height = (data[5] | (data[6] << 8)) & 0x3fff;
663 pc->vert_scale = data[6] >> 6;
666 if (Width != pc->Width || Height != pc->Height)
671 vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
672 "Invalid frame width");
678 vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
679 "Invalid frame height");
682 if (vp8_alloc_frame_buffers(pc, pc->Width, pc->Height))
683 vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
684 "Failed to allocate frame buffers");
688 if (pc->Width == 0 || pc->Height == 0)
695 if (vp8dx_start_decode(bc, IF_RTCD(&pbi->dboolhuff),
696 data, data_end - data))
697 vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
698 "Failed to allocate bool decoder 0");
699 if (pc->frame_type == KEY_FRAME) {
700 pc->clr_type = (YUV_TYPE)vp8_read_bit(bc);
701 pc->clamp_type = (CLAMP_TYPE)vp8_read_bit(bc);
704 // Is segmentation enabled
705 xd->segmentation_enabled = (unsigned char)vp8_read_bit(bc);
707 if (xd->segmentation_enabled)
709 // Signal whether or not the segmentation map is being explicitly updated this frame.
710 xd->update_mb_segmentation_map = (unsigned char)vp8_read_bit(bc);
711 xd->update_mb_segmentation_data = (unsigned char)vp8_read_bit(bc);
713 if (xd->update_mb_segmentation_data)
715 xd->mb_segement_abs_delta = (unsigned char)vp8_read_bit(bc);
717 vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
719 // For each segmentation feature (Quant and loop filter level)
720 for (i = 0; i < MB_LVL_MAX; i++)
722 for (j = 0; j < MAX_MB_SEGMENTS; j++)
725 if (vp8_read_bit(bc))
727 xd->segment_feature_data[i][j] = (signed char)vp8_read_literal(bc, mb_feature_data_bits[i]);
729 if (vp8_read_bit(bc))
730 xd->segment_feature_data[i][j] = -xd->segment_feature_data[i][j];
733 xd->segment_feature_data[i][j] = 0;
738 if (xd->update_mb_segmentation_map)
740 // Which macro block level features are enabled
741 vpx_memset(xd->mb_segment_tree_probs, 255, sizeof(xd->mb_segment_tree_probs));
743 // Read the probs used to decode the segment id for each macro block.
744 for (i = 0; i < MB_FEATURE_TREE_PROBS; i++)
746 // If not explicitly set value is defaulted to 255 by memset above
747 if (vp8_read_bit(bc))
748 xd->mb_segment_tree_probs[i] = (vp8_prob)vp8_read_literal(bc, 8);
753 // Read the loop filter level and type
754 pc->filter_type = (LOOPFILTERTYPE) vp8_read_bit(bc);
755 pc->filter_level = vp8_read_literal(bc, 6);
756 pc->sharpness_level = vp8_read_literal(bc, 3);
758 // Read in loop filter deltas applied at the MB level based on mode or ref frame.
759 xd->mode_ref_lf_delta_update = 0;
760 xd->mode_ref_lf_delta_enabled = (unsigned char)vp8_read_bit(bc);
762 if (xd->mode_ref_lf_delta_enabled)
764 // Do the deltas need to be updated
765 xd->mode_ref_lf_delta_update = (unsigned char)vp8_read_bit(bc);
767 if (xd->mode_ref_lf_delta_update)
770 for (i = 0; i < MAX_REF_LF_DELTAS; i++)
772 if (vp8_read_bit(bc))
774 //sign = vp8_read_bit( bc );
775 xd->ref_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
777 if (vp8_read_bit(bc)) // Apply sign
778 xd->ref_lf_deltas[i] = xd->ref_lf_deltas[i] * -1;
783 for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
785 if (vp8_read_bit(bc))
787 //sign = vp8_read_bit( bc );
788 xd->mode_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
790 if (vp8_read_bit(bc)) // Apply sign
791 xd->mode_lf_deltas[i] = xd->mode_lf_deltas[i] * -1;
797 setup_token_decoder(pbi, data + first_partition_length_in_bytes);
798 xd->current_bc = &pbi->bc2;
800 // Read the default quantizers.
804 Q = vp8_read_literal(bc, 7); // AC 1st order Q = default
807 pc->y1dc_delta_q = get_delta_q(bc, pc->y1dc_delta_q, &q_update);
808 pc->y2dc_delta_q = get_delta_q(bc, pc->y2dc_delta_q, &q_update);
809 pc->y2ac_delta_q = get_delta_q(bc, pc->y2ac_delta_q, &q_update);
810 pc->uvdc_delta_q = get_delta_q(bc, pc->uvdc_delta_q, &q_update);
811 pc->uvac_delta_q = get_delta_q(bc, pc->uvac_delta_q, &q_update);
814 vp8cx_init_de_quantizer(pbi);
816 // MB level dequantizer setup
817 mb_init_dequantizer(pbi, &pbi->mb);
820 // Determine if the golden frame or ARF buffer should be updated and how.
821 // For all non key frames the GF and ARF refresh flags and sign bias
822 // flags must be set explicitly.
823 if (pc->frame_type != KEY_FRAME)
825 // Should the GF or ARF be updated from the current frame
826 pc->refresh_golden_frame = vp8_read_bit(bc);
827 pc->refresh_alt_ref_frame = vp8_read_bit(bc);
829 // Buffer to buffer copy flags.
830 pc->copy_buffer_to_gf = 0;
832 if (!pc->refresh_golden_frame)
833 pc->copy_buffer_to_gf = vp8_read_literal(bc, 2);
835 pc->copy_buffer_to_arf = 0;
837 if (!pc->refresh_alt_ref_frame)
838 pc->copy_buffer_to_arf = vp8_read_literal(bc, 2);
840 pc->ref_frame_sign_bias[GOLDEN_FRAME] = vp8_read_bit(bc);
841 pc->ref_frame_sign_bias[ALTREF_FRAME] = vp8_read_bit(bc);
844 pc->refresh_entropy_probs = vp8_read_bit(bc);
845 if (pc->refresh_entropy_probs == 0)
847 vpx_memcpy(&pc->lfc, &pc->fc, sizeof(pc->fc));
850 pc->refresh_last_frame = pc->frame_type == KEY_FRAME || vp8_read_bit(bc);
854 FILE *z = fopen("decodestats.stt", "a");
855 fprintf(z, "%6d F:%d,G:%d,A:%d,L:%d,Q:%d\n",
856 pc->current_video_frame,
858 pc->refresh_golden_frame,
859 pc->refresh_alt_ref_frame,
860 pc->refresh_last_frame,
867 // read coef probability tree
869 for (i = 0; i < BLOCK_TYPES; i++)
870 for (j = 0; j < COEF_BANDS; j++)
871 for (k = 0; k < PREV_COEF_CONTEXTS; k++)
872 for (l = 0; l < MAX_ENTROPY_TOKENS - 1; l++)
875 vp8_prob *const p = pc->fc.coef_probs [i][j][k] + l;
877 if (vp8_read(bc, vp8_coef_update_probs [i][j][k][l]))
879 *p = (vp8_prob)vp8_read_literal(bc, 8);
885 vpx_memcpy(&xd->pre, &pc->yv12_fb[pc->lst_fb_idx], sizeof(YV12_BUFFER_CONFIG));
886 vpx_memcpy(&xd->dst, &pc->yv12_fb[pc->new_fb_idx], sizeof(YV12_BUFFER_CONFIG));
888 // set up frame new frame for intra coded blocks
889 vp8_setup_intra_recon(&pc->yv12_fb[pc->new_fb_idx]);
891 vp8_setup_block_dptrs(xd);
893 vp8_build_block_doffsets(xd);
895 // clear out the coeff buffer
896 vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
898 // Read the mb_no_coeff_skip flag
899 pc->mb_no_coeff_skip = (int)vp8_read_bit(bc);
901 if (pc->frame_type == KEY_FRAME)
902 vp8_kfread_modes(pbi);
904 vp8_decode_mode_mvs(pbi);
906 // reset since these guys are used as iterators
907 vpx_memset(pc->above_context[Y1CONTEXT], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols * 4);
908 vpx_memset(pc->above_context[UCONTEXT ], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols * 2);
909 vpx_memset(pc->above_context[VCONTEXT ], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols * 2);
910 vpx_memset(pc->above_context[Y2CONTEXT], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols);
912 xd->gf_active_ptr = (signed char *)pc->gf_active_flags; // Point to base of GF active flags data structure
915 vpx_memcpy(&xd->block[0].bmi, &xd->mode_info_context->bmi[0], sizeof(B_MODE_INFO));
918 if (pbi->b_multithreaded_lf && pc->filter_level != 0)
919 vp8_start_lfthread(pbi);
921 if (pbi->b_multithreaded_rd && pc->multi_token_partition != ONE_PARTITION)
923 vp8_mtdecode_mb_rows(pbi, xd);
928 int num_part = 1 << pc->multi_token_partition;
930 // Decode the individual macro block
931 for (mb_row = 0; mb_row < pc->mb_rows; mb_row++)
936 xd->current_bc = & pbi->mbc[ibc];
943 vp8_decode_mb_row(pbi, pc, mb_row, xd);
946 pbi->last_mb_row_decoded = mb_row;
950 stop_token_decoder(pbi);
952 // vpx_log("Decoder: Frame Decoded, Size Roughly:%d bytes \n",bc->pos+pbi->bc2.pos);
954 // If this was a kf or Gf note the Q used
955 if ((pc->frame_type == KEY_FRAME) ||
956 pc->refresh_golden_frame || pc->refresh_alt_ref_frame)
958 pc->last_kf_gf_q = pc->base_qindex;
961 if (pc->refresh_entropy_probs == 0)
963 vpx_memcpy(&pc->fc, &pc->lfc, sizeof(pc->fc));
966 #ifdef PACKET_TESTING
968 FILE *f = fopen("decompressor.VP8", "ab");
969 unsigned int size = pbi->bc2.pos + pbi->bc.pos + 8;
970 fwrite((void *) &size, 4, 1, f);
971 fwrite((void *) pbi->Source, size, 1, f);