2 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
3 * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @file libavcodec/cavsdec.c
24 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder
25 * @author Stefan Gehrer <stefan.gehrer@gmx.de>
29 #include "bitstream.h"
33 static const uint8_t mv_scan[4] = {
38 static const uint8_t cbp_tab[64][2] = {
39 {63, 0},{15,15},{31,63},{47,31},{ 0,16},{14,32},{13,47},{11,13},
40 { 7,14},{ 5,11},{10,12},{ 8, 5},{12,10},{61, 7},{ 4,48},{55, 3},
41 { 1, 2},{ 2, 8},{59, 4},{ 3, 1},{62,61},{ 9,55},{ 6,59},{29,62},
42 {45,29},{51,27},{23,23},{39,19},{27,30},{46,28},{53, 9},{30, 6},
43 {43,60},{37,21},{60,44},{16,26},{21,51},{28,35},{19,18},{35,20},
44 {42,24},{26,53},{44,17},{32,37},{58,39},{24,45},{20,58},{17,43},
45 {18,42},{48,46},{22,36},{33,33},{25,34},{49,40},{40,52},{36,49},
46 {34,50},{50,56},{52,25},{54,22},{41,54},{56,57},{38,41},{57,38}
49 /*****************************************************************************
51 * motion vector prediction
53 ****************************************************************************/
55 static inline void store_mvs(AVSContext *h) {
56 h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 0] = h->mv[MV_FWD_X0];
57 h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 1] = h->mv[MV_FWD_X1];
58 h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2];
59 h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3];
62 static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
63 cavs_vector *col_mv) {
64 cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
65 int den = h->direct_den[col_mv->ref];
66 int m = col_mv->x >> 31;
68 pmv_fw->dist = h->dist[1];
69 pmv_bw->dist = h->dist[0];
72 /* scale the co-located motion vector according to its temporal span */
73 pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m;
74 pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m);
76 pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m;
77 pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m);
80 static inline void mv_pred_sym(AVSContext *h, cavs_vector *src, enum cavs_block size) {
81 cavs_vector *dst = src + MV_BWD_OFFS;
83 /* backward mv is the scaled and negated forward mv */
84 dst->x = -((src->x * h->sym_factor + 256) >> 9);
85 dst->y = -((src->y * h->sym_factor + 256) >> 9);
87 dst->dist = h->dist[0];
91 /*****************************************************************************
93 * residual data decoding
95 ****************************************************************************/
97 /** kth-order exponential golomb code */
98 static inline int get_ue_code(GetBitContext *gb, int order) {
100 int ret = get_ue_golomb(gb) << order;
101 return ret + get_bits(gb,order);
103 return get_ue_golomb(gb);
107 * decode coefficients from one 8x8 block, dequantize, inverse transform
108 * and add them to sample block
109 * @param r pointer to 2D VLC table
110 * @param esc_golomb_order escape codes are k-golomb with this order k
111 * @param qp quantizer
112 * @param dst location of sample block
113 * @param stride line stride in frame buffer
115 static int decode_residual_block(AVSContext *h, GetBitContext *gb,
116 const struct dec_2dvlc *r, int esc_golomb_order,
117 int qp, uint8_t *dst, int stride) {
118 int i, level_code, esc_code, level, run, mask;
119 DCTELEM level_buf[65];
121 DCTELEM *block = h->block;
124 level_code = get_ue_code(gb,r->golomb_order);
125 if(level_code >= ESCAPE_CODE) {
126 run = ((level_code - ESCAPE_CODE) >> 1) + 1;
127 esc_code = get_ue_code(gb,esc_golomb_order);
128 level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
129 while(level > r->inc_limit)
131 mask = -(level_code & 1);
132 level = (level^mask) - mask;
134 level = r->rltab[level_code][0];
135 if(!level) //end of block signal
137 run = r->rltab[level_code][1];
138 r += r->rltab[level_code][2];
140 level_buf[i] = level;
143 if(dequant(h,level_buf, run_buf, block, ff_cavs_dequant_mul[qp],
144 ff_cavs_dequant_shift[qp], i))
146 h->s.dsp.cavs_idct8_add(dst,block,stride);
147 h->s.dsp.clear_block(block);
152 static inline void decode_residual_chroma(AVSContext *h) {
154 decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0,
155 ff_cavs_chroma_qp[h->qp],h->cu,h->c_stride);
157 decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0,
158 ff_cavs_chroma_qp[h->qp],h->cv,h->c_stride);
161 static inline int decode_residual_inter(AVSContext *h) {
164 /* get coded block pattern */
165 int cbp= get_ue_golomb(&h->s.gb);
167 av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n");
170 h->cbp = cbp_tab[cbp][1];
173 if(h->cbp && !h->qp_fixed)
174 h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63;
175 for(block=0;block<4;block++)
176 if(h->cbp & (1<<block))
177 decode_residual_block(h,&h->s.gb,ff_cavs_inter_dec,0,h->qp,
178 h->cy + h->luma_scan[block], h->l_stride);
179 decode_residual_chroma(h);
184 /*****************************************************************************
188 ****************************************************************************/
190 static int decode_mb_i(AVSContext *h, int cbp_code) {
191 GetBitContext *gb = &h->s.gb;
192 int block, pred_mode_uv;
194 uint8_t *left = NULL;
199 /* get intra prediction modes from stream */
200 for(block=0;block<4;block++) {
202 int pos = ff_cavs_scan3x3[block];
204 nA = h->pred_mode_Y[pos-1];
205 nB = h->pred_mode_Y[pos-3];
206 predpred = FFMIN(nA,nB);
207 if(predpred == NOT_AVAIL) // if either is not available
208 predpred = INTRA_L_LP;
210 int rem_mode= get_bits(gb, 2);
211 predpred = rem_mode + (rem_mode >= predpred);
213 h->pred_mode_Y[pos] = predpred;
215 pred_mode_uv = get_ue_golomb(gb);
216 if(pred_mode_uv > 6) {
217 av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
220 ff_cavs_modify_mb_i(h, &pred_mode_uv);
222 /* get coded block pattern */
223 if(h->pic_type == FF_I_TYPE)
224 cbp_code = get_ue_golomb(gb);
226 av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n");
229 h->cbp = cbp_tab[cbp_code][0];
230 if(h->cbp && !h->qp_fixed)
231 h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
233 /* luma intra prediction interleaved with residual decode/transform/add */
234 for(block=0;block<4;block++) {
235 d = h->cy + h->luma_scan[block];
236 ff_cavs_load_intra_pred_luma(h, top, &left, block);
237 h->intra_pred_l[h->pred_mode_Y[ff_cavs_scan3x3[block]]]
238 (d, top, left, h->l_stride);
239 if(h->cbp & (1<<block))
240 decode_residual_block(h,gb,ff_cavs_intra_dec,1,h->qp,d,h->l_stride);
243 /* chroma intra prediction */
244 ff_cavs_load_intra_pred_chroma(h);
245 h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10],
246 h->left_border_u, h->c_stride);
247 h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10],
248 h->left_border_v, h->c_stride);
250 decode_residual_chroma(h);
251 ff_cavs_filter(h,I_8X8);
256 static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type) {
257 GetBitContext *gb = &h->s.gb;
263 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
266 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
267 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]);
270 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
271 ref[2] = h->ref_flag ? 0 : get_bits1(gb);
272 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
273 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
276 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
277 ref[1] = h->ref_flag ? 0 : get_bits1(gb);
278 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
279 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, ref[1]);
282 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
283 ref[1] = h->ref_flag ? 0 : get_bits1(gb);
284 ref[2] = h->ref_flag ? 0 : get_bits1(gb);
285 ref[3] = h->ref_flag ? 0 : get_bits1(gb);
286 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
287 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
288 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
289 ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
291 ff_cavs_inter(h, mb_type);
292 set_intra_mode_default(h);
294 if(mb_type != P_SKIP)
295 decode_residual_inter(h);
296 ff_cavs_filter(h,mb_type);
297 *h->col_type = mb_type;
300 static void decode_mb_b(AVSContext *h, enum cavs_mb mb_type) {
302 enum cavs_sub_mb sub_type[4];
308 h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
309 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
310 h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
311 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
315 if(!(*h->col_type)) {
316 /* intra MB at co-location, do in-plane prediction */
317 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
318 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
320 /* direct prediction from co-located P MB, block-wise */
321 for(block=0;block<4;block++)
322 mv_pred_direct(h,&h->mv[mv_scan[block]],
323 &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);
326 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
329 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
330 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
333 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
336 for(block=0;block<4;block++)
337 sub_type[block] = get_bits(&h->s.gb,2);
338 for(block=0;block<4;block++) {
339 switch(sub_type[block]) {
341 if(!(*h->col_type)) {
342 /* intra MB at co-location, do in-plane prediction */
343 ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
344 MV_PRED_BSKIP, BLK_8X8, 1);
345 ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS,
346 mv_scan[block]-3+MV_BWD_OFFS,
347 MV_PRED_BSKIP, BLK_8X8, 0);
349 mv_pred_direct(h,&h->mv[mv_scan[block]],
350 &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);
353 ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
354 MV_PRED_MEDIAN, BLK_8X8, 1);
357 ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
358 MV_PRED_MEDIAN, BLK_8X8, 1);
359 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
363 for(block=0;block<4;block++) {
364 if(sub_type[block] == B_SUB_BWD)
365 ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS,
366 mv_scan[block]+MV_BWD_OFFS-3,
367 MV_PRED_MEDIAN, BLK_8X8, 0);
371 assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));
372 flags = ff_cavs_partition_flags[mb_type];
373 if(mb_type & 1) { /* 16x8 macroblock types */
375 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
377 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
379 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
381 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
383 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
385 ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
386 } else { /* 8x16 macroblock types */
388 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
390 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
392 ff_cavs_mv(h,MV_FWD_X1,MV_FWD_C2,MV_PRED_TOPRIGHT,BLK_8X16,1);
394 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
396 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
398 ff_cavs_mv(h,MV_BWD_X1,MV_BWD_C2,MV_PRED_TOPRIGHT,BLK_8X16,0);
401 ff_cavs_inter(h, mb_type);
402 set_intra_mode_default(h);
403 if(mb_type != B_SKIP)
404 decode_residual_inter(h);
405 ff_cavs_filter(h,mb_type);
408 /*****************************************************************************
412 ****************************************************************************/
414 static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {
416 av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
418 if((h->mby == 0) && (!h->qp_fixed)){
419 h->qp_fixed = get_bits1(gb);
420 h->qp = get_bits(gb,6);
422 /* inter frame or second slice can have weighting params */
423 if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))
424 if(get_bits1(gb)) { //slice_weighting_flag
425 av_log(h->s.avctx, AV_LOG_ERROR,
426 "weighted prediction not yet supported\n");
431 static inline void check_for_slice(AVSContext *h) {
432 GetBitContext *gb = &h->s.gb;
434 align = (-get_bits_count(gb)) & 7;
435 if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {
436 skip_bits_long(gb,24+align);
437 h->stc = get_bits(gb,8);
438 decode_slice_header(h,gb);
442 /*****************************************************************************
446 ****************************************************************************/
448 static int decode_pic(AVSContext *h) {
449 MpegEncContext *s = &h->s;
451 enum cavs_mb mb_type;
453 if (!s->context_initialized) {
454 s->avctx->idct_algo = FF_IDCT_CAVS;
455 if (MPV_common_init(s) < 0)
457 ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);
459 skip_bits(&s->gb,16);//bbv_dwlay
460 if(h->stc == PIC_PB_START_CODE) {
461 h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;
462 if(h->pic_type > FF_B_TYPE) {
463 av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");
466 /* make sure we have the reference frames we need */
467 if(!h->DPB[0].data[0] ||
468 (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))
471 h->pic_type = FF_I_TYPE;
472 if(get_bits1(&s->gb))
473 skip_bits(&s->gb,24);//time_code
475 /* release last B frame */
476 if(h->picture.data[0])
477 s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);
479 s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);
481 h->picture.poc = get_bits(&s->gb,8)*2;
483 /* get temporal distances and MV scaling factors */
484 if(h->pic_type != FF_B_TYPE) {
485 h->dist[0] = (h->picture.poc - h->DPB[0].poc + 512) % 512;
487 h->dist[0] = (h->DPB[0].poc - h->picture.poc + 512) % 512;
489 h->dist[1] = (h->picture.poc - h->DPB[1].poc + 512) % 512;
490 h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
491 h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
492 if(h->pic_type == FF_B_TYPE) {
493 h->sym_factor = h->dist[0]*h->scale_den[1];
495 h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;
496 h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;
500 get_ue_golomb(&s->gb); //bbv_check_times
501 h->progressive = get_bits1(&s->gb);
502 h->pic_structure = 1;
504 h->pic_structure = get_bits1(&s->gb);
505 if(!h->pic_structure && h->stc == PIC_PB_START_CODE)
506 skip_bits1(&s->gb); //advanced_pred_mode_disable
507 skip_bits1(&s->gb); //top_field_first
508 skip_bits1(&s->gb); //repeat_first_field
509 h->qp_fixed = get_bits1(&s->gb);
510 h->qp = get_bits(&s->gb,6);
511 if(h->pic_type == FF_I_TYPE) {
512 if(!h->progressive && !h->pic_structure)
513 skip_bits1(&s->gb);//what is this?
514 skip_bits(&s->gb,4); //reserved bits
516 if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))
517 h->ref_flag = get_bits1(&s->gb);
518 skip_bits(&s->gb,4); //reserved bits
519 h->skip_mode_flag = get_bits1(&s->gb);
521 h->loop_filter_disable = get_bits1(&s->gb);
522 if(!h->loop_filter_disable && get_bits1(&s->gb)) {
523 h->alpha_offset = get_se_golomb(&s->gb);
524 h->beta_offset = get_se_golomb(&s->gb);
526 h->alpha_offset = h->beta_offset = 0;
529 if(h->pic_type == FF_I_TYPE) {
532 } while(ff_cavs_next_mb(h));
533 } else if(h->pic_type == FF_P_TYPE) {
535 if(h->skip_mode_flag) {
536 skip_count = get_ue_golomb(&s->gb);
537 while(skip_count--) {
538 decode_mb_p(h,P_SKIP);
539 if(!ff_cavs_next_mb(h))
542 mb_type = get_ue_golomb(&s->gb) + P_16X16;
544 mb_type = get_ue_golomb(&s->gb) + P_SKIP;
545 if(mb_type > P_8X8) {
546 decode_mb_i(h, mb_type - P_8X8 - 1);
548 decode_mb_p(h,mb_type);
549 } while(ff_cavs_next_mb(h));
550 } else { /* FF_B_TYPE */
552 if(h->skip_mode_flag) {
553 skip_count = get_ue_golomb(&s->gb);
554 while(skip_count--) {
555 decode_mb_b(h,B_SKIP);
556 if(!ff_cavs_next_mb(h))
559 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;
561 mb_type = get_ue_golomb(&s->gb) + B_SKIP;
562 if(mb_type > B_8X8) {
563 decode_mb_i(h, mb_type - B_8X8 - 1);
565 decode_mb_b(h,mb_type);
566 } while(ff_cavs_next_mb(h));
569 if(h->pic_type != FF_B_TYPE) {
570 if(h->DPB[1].data[0])
571 s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);
572 h->DPB[1] = h->DPB[0];
573 h->DPB[0] = h->picture;
574 memset(&h->picture,0,sizeof(Picture));
579 /*****************************************************************************
581 * headers and interface
583 ****************************************************************************/
585 static int decode_seq_header(AVSContext *h) {
586 MpegEncContext *s = &h->s;
589 h->profile = get_bits(&s->gb,8);
590 h->level = get_bits(&s->gb,8);
591 skip_bits1(&s->gb); //progressive sequence
592 s->width = get_bits(&s->gb,14);
593 s->height = get_bits(&s->gb,14);
594 skip_bits(&s->gb,2); //chroma format
595 skip_bits(&s->gb,3); //sample_precision
596 h->aspect_ratio = get_bits(&s->gb,4);
597 frame_rate_code = get_bits(&s->gb,4);
598 skip_bits(&s->gb,18);//bit_rate_lower
599 skip_bits1(&s->gb); //marker_bit
600 skip_bits(&s->gb,12);//bit_rate_upper
601 s->low_delay = get_bits1(&s->gb);
602 h->mb_width = (s->width + 15) >> 4;
603 h->mb_height = (s->height + 15) >> 4;
604 h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;
605 h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;
606 h->s.avctx->width = s->width;
607 h->s.avctx->height = s->height;
609 ff_cavs_init_top_lines(h);
613 static void cavs_flush(AVCodecContext * avctx) {
614 AVSContext *h = avctx->priv_data;
618 static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,
619 const uint8_t * buf, int buf_size) {
620 AVSContext *h = avctx->priv_data;
621 MpegEncContext *s = &h->s;
623 const uint8_t *buf_end;
624 const uint8_t *buf_ptr;
625 AVFrame *picture = data;
631 if(!s->low_delay && h->DPB[0].data[0]) {
632 *data_size = sizeof(AVPicture);
633 *picture = *(AVFrame *) &h->DPB[0];
639 buf_end = buf + buf_size;
641 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);
643 return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);
644 input_size = (buf_end - buf_ptr)*8;
646 case CAVS_START_CODE:
647 init_get_bits(&s->gb, buf_ptr, input_size);
648 decode_seq_header(h);
650 case PIC_I_START_CODE:
651 if(!h->got_keyframe) {
652 if(h->DPB[0].data[0])
653 avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);
654 if(h->DPB[1].data[0])
655 avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);
658 case PIC_PB_START_CODE:
662 init_get_bits(&s->gb, buf_ptr, input_size);
666 *data_size = sizeof(AVPicture);
667 if(h->pic_type != FF_B_TYPE) {
668 if(h->DPB[1].data[0]) {
669 *picture = *(AVFrame *) &h->DPB[1];
674 *picture = *(AVFrame *) &h->picture;
677 //mpeg_decode_extension(avctx,buf_ptr, input_size);
679 case USER_START_CODE:
680 //mpeg_decode_user_data(avctx,buf_ptr, input_size);
683 if (stc <= SLICE_MAX_START_CODE) {
684 init_get_bits(&s->gb, buf_ptr, input_size);
685 decode_slice_header(h, &s->gb);
692 AVCodec cavs_decoder = {
701 CODEC_CAP_DR1 | CODEC_CAP_DELAY,
703 .long_name= NULL_IF_CONFIG_SMALL("Chinese AVS video (AVS1-P2, JiZhun profile)"),