3 * Copyright (c) 2000,2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include "mpegvideo.h"
34 #include "mpeg12data.h"
35 #include "mpeg12decdata.h"
36 #include "bytestream.h"
43 #define MBINCR_VLC_BITS 9
44 #define MB_PAT_VLC_BITS 9
45 #define MB_PTYPE_VLC_BITS 6
46 #define MB_BTYPE_VLC_BITS 6
48 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
51 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
54 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
55 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
58 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
61 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
62 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
63 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
64 static void exchange_uv(MpegEncContext *s);
66 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
67 extern int XVMC_field_end(MpegEncContext *s);
68 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
69 extern void XVMC_init_block(MpegEncContext *s);//set s->block
71 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
72 PIX_FMT_XVMC_MPEG2_IDCT,
73 PIX_FMT_XVMC_MPEG2_MC,
76 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
79 #define INIT_2D_VLC_RL(rl, static_size)\
81 static RL_VLC_ELEM rl_vlc_table[static_size];\
82 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
83 &rl.table_vlc[0][1], 4, 2,\
84 &rl.table_vlc[0][0], 4, 2, static_size);\
86 rl.rl_vlc[0]= rl_vlc_table;\
90 static void init_2d_vlc_rl(RLTable *rl)
94 for(i=0; i<rl->vlc.table_size; i++){
95 int code= rl->vlc.table[i][0];
96 int len = rl->vlc.table[i][1];
99 if(len==0){ // illegal code
102 }else if(len<0){ //more bits needed
106 if(code==rl->n){ //esc
109 }else if(code==rl->n+1){ //eob
113 run= rl->table_run [code] + 1;
114 level= rl->table_level[code];
117 rl->rl_vlc[0][i].len= len;
118 rl->rl_vlc[0][i].level= level;
119 rl->rl_vlc[0][i].run= run;
123 void ff_mpeg12_common_init(MpegEncContext *s)
127 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
131 void ff_mpeg1_clean_buffers(MpegEncContext *s){
132 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
133 s->last_dc[1] = s->last_dc[0];
134 s->last_dc[2] = s->last_dc[0];
135 memset(s->last_mv, 0, sizeof(s->last_mv));
139 /******************************************/
143 static VLC mbincr_vlc;
144 static VLC mb_ptype_vlc;
145 static VLC mb_btype_vlc;
146 static VLC mb_pat_vlc;
148 av_cold void ff_mpeg12_init_vlcs(void)
155 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
156 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
157 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
158 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
159 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
160 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
161 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
162 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
163 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
164 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
165 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
166 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
167 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
168 &ff_mpeg12_mbPatTable[0][1], 2, 1,
169 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
171 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
172 &table_mb_ptype[0][1], 2, 1,
173 &table_mb_ptype[0][0], 2, 1, 64);
174 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
175 &table_mb_btype[0][1], 2, 1,
176 &table_mb_btype[0][0], 2, 1, 64);
177 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
178 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
180 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
181 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
185 static inline int get_dmv(MpegEncContext *s)
187 if(get_bits1(&s->gb))
188 return 1 - (get_bits1(&s->gb) << 1);
193 static inline int get_qscale(MpegEncContext *s)
195 int qscale = get_bits(&s->gb, 5);
196 if (s->q_scale_type) {
197 return non_linear_qscale[qscale];
203 /* motion type (for MPEG-2) */
209 static int mpeg_decode_mb(MpegEncContext *s,
210 DCTELEM block[12][64])
212 int i, j, k, cbp, val, mb_type, motion_type;
213 const int mb_block_count = 4 + (1<< s->chroma_format);
215 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
217 assert(s->mb_skipped==0);
219 if (s->mb_skip_run-- != 0) {
220 if (s->pict_type == FF_P_TYPE) {
222 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
227 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
229 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
230 if(IS_INTRA(mb_type))
233 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
234 mb_type | MB_TYPE_SKIP;
235 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
237 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
244 switch(s->pict_type) {
247 if (get_bits1(&s->gb) == 0) {
248 if (get_bits1(&s->gb) == 0){
249 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
252 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
254 mb_type = MB_TYPE_INTRA;
258 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
260 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
263 mb_type = ptype2mb_type[ mb_type ];
266 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
268 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
271 mb_type = btype2mb_type[ mb_type ];
274 dprintf(s->avctx, "mb_type=%x\n", mb_type);
275 // motion_type = 0; /* avoid warning */
276 if (IS_INTRA(mb_type)) {
277 s->dsp.clear_blocks(s->block[0]);
279 if(!s->chroma_y_shift){
280 s->dsp.clear_blocks(s->block[6]);
283 /* compute DCT type */
284 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
285 !s->frame_pred_frame_dct) {
286 s->interlaced_dct = get_bits1(&s->gb);
289 if (IS_QUANT(mb_type))
290 s->qscale = get_qscale(s);
292 if (s->concealment_motion_vectors) {
293 /* just parse them */
294 if (s->picture_structure != PICT_FRAME)
295 skip_bits1(&s->gb); /* field select */
297 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
298 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
299 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
300 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
302 skip_bits1(&s->gb); /* marker */
304 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
307 //if 1, we memcpy blocks in xvmcvideo
308 if(s->avctx->xvmc_acceleration > 1){
309 XVMC_pack_pblocks(s,-1);//inter are always full blocks
316 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
317 if(s->flags2 & CODEC_FLAG2_FAST){
319 mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
322 for(i=0;i<mb_block_count;i++) {
323 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
329 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
334 if (mb_type & MB_TYPE_ZERO_MV){
335 assert(mb_type & MB_TYPE_CBP);
337 s->mv_dir = MV_DIR_FORWARD;
338 if(s->picture_structure == PICT_FRAME){
339 if(!s->frame_pred_frame_dct)
340 s->interlaced_dct = get_bits1(&s->gb);
341 s->mv_type = MV_TYPE_16X16;
343 s->mv_type = MV_TYPE_FIELD;
344 mb_type |= MB_TYPE_INTERLACED;
345 s->field_select[0][0]= s->picture_structure - 1;
348 if (IS_QUANT(mb_type))
349 s->qscale = get_qscale(s);
351 s->last_mv[0][0][0] = 0;
352 s->last_mv[0][0][1] = 0;
353 s->last_mv[0][1][0] = 0;
354 s->last_mv[0][1][1] = 0;
358 assert(mb_type & MB_TYPE_L0L1);
359 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
360 /* get additional motion vector type */
361 if (s->frame_pred_frame_dct)
362 motion_type = MT_FRAME;
364 motion_type = get_bits(&s->gb, 2);
365 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
366 s->interlaced_dct = get_bits1(&s->gb);
369 if (IS_QUANT(mb_type))
370 s->qscale = get_qscale(s);
373 s->mv_dir= (mb_type>>13)&3;
374 dprintf(s->avctx, "motion_type=%d\n", motion_type);
375 switch(motion_type) {
376 case MT_FRAME: /* or MT_16X8 */
377 if (s->picture_structure == PICT_FRAME) {
378 mb_type |= MB_TYPE_16x16;
379 s->mv_type = MV_TYPE_16X16;
381 if (USES_LIST(mb_type, i)) {
383 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
384 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
385 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
386 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
387 /* full_pel: only for MPEG-1 */
389 s->mv[i][0][0] <<= 1;
390 s->mv[i][0][1] <<= 1;
395 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
396 s->mv_type = MV_TYPE_16X8;
398 if (USES_LIST(mb_type, i)) {
401 s->field_select[i][j] = get_bits1(&s->gb);
403 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
404 s->last_mv[i][j][k]);
405 s->last_mv[i][j][k] = val;
406 s->mv[i][j][k] = val;
414 s->mv_type = MV_TYPE_FIELD;
415 if (s->picture_structure == PICT_FRAME) {
416 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
418 if (USES_LIST(mb_type, i)) {
420 s->field_select[i][j] = get_bits1(&s->gb);
421 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
422 s->last_mv[i][j][0]);
423 s->last_mv[i][j][0] = val;
424 s->mv[i][j][0] = val;
425 dprintf(s->avctx, "fmx=%d\n", val);
426 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
427 s->last_mv[i][j][1] >> 1);
428 s->last_mv[i][j][1] = val << 1;
429 s->mv[i][j][1] = val;
430 dprintf(s->avctx, "fmy=%d\n", val);
435 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
437 if (USES_LIST(mb_type, i)) {
438 s->field_select[i][0] = get_bits1(&s->gb);
440 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441 s->last_mv[i][0][k]);
442 s->last_mv[i][0][k] = val;
443 s->last_mv[i][1][k] = val;
444 s->mv[i][0][k] = val;
451 s->mv_type = MV_TYPE_DMV;
453 if (USES_LIST(mb_type, i)) {
454 int dmx, dmy, mx, my, m;
455 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
456 s->last_mv[i][0][0]);
457 s->last_mv[i][0][0] = mx;
458 s->last_mv[i][1][0] = mx;
460 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
461 s->last_mv[i][0][1] >> 1);
465 s->last_mv[i][0][1] = my<<1;
466 s->last_mv[i][1][1] = my<<1;
470 s->mv[i][1][0] = mx;//not used
471 s->mv[i][1][1] = my;//not used
473 if (s->picture_structure == PICT_FRAME) {
474 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
476 //m = 1 + 2 * s->top_field_first;
477 m = s->top_field_first ? 1 : 3;
479 /* top -> top pred */
480 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
481 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
483 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
484 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
486 mb_type |= MB_TYPE_16x16;
488 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
489 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
490 if(s->picture_structure == PICT_TOP_FIELD)
499 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
505 if (HAS_CBP(mb_type)) {
506 s->dsp.clear_blocks(s->block[0]);
508 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
509 if(mb_block_count > 6){
510 cbp<<= mb_block_count-6;
511 cbp |= get_bits(&s->gb, mb_block_count-6);
512 s->dsp.clear_blocks(s->block[6]);
515 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
520 //if 1, we memcpy blocks in xvmcvideo
521 if(s->avctx->xvmc_acceleration > 1){
522 XVMC_pack_pblocks(s,cbp);
529 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
530 if(s->flags2 & CODEC_FLAG2_FAST){
533 mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
535 s->block_last_index[i] = -1;
540 cbp<<= 12-mb_block_count;
542 for(i=0;i<mb_block_count;i++) {
543 if ( cbp & (1<<11) ) {
544 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
547 s->block_last_index[i] = -1;
553 if(s->flags2 & CODEC_FLAG2_FAST){
556 mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
558 s->block_last_index[i] = -1;
565 if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
568 s->block_last_index[i] = -1;
576 s->block_last_index[i] = -1;
580 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
585 /* as H.263, but only 17 codes */
586 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
588 int code, sign, val, l, shift;
590 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
598 sign = get_bits1(&s->gb);
602 val = (val - 1) << shift;
603 val |= get_bits(&s->gb, shift);
610 /* modulo decoding */
611 l= INT_BIT - 5 - shift;
616 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
620 int level, dc, diff, i, j, run;
622 RLTable *rl = &ff_rl_mpeg1;
623 uint8_t * const scantable= s->intra_scantable.permutated;
624 const uint16_t *quant_matrix= s->intra_matrix;
625 const int qscale= s->qscale;
628 component = (n <= 3 ? 0 : n - 4 + 1);
629 diff = decode_dc(&s->gb, component);
632 dc = s->last_dc[component];
634 s->last_dc[component] = dc;
636 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
639 OPEN_READER(re, &s->gb);
640 /* now quantify & encode AC coefficients */
642 UPDATE_CACHE(re, &s->gb);
643 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
647 } else if(level != 0) {
650 level= (level*qscale*quant_matrix[j])>>4;
652 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
653 LAST_SKIP_BITS(re, &s->gb, 1);
656 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
657 UPDATE_CACHE(re, &s->gb);
658 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
660 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
661 } else if (level == 0) {
662 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
668 level= (level*qscale*quant_matrix[j])>>4;
672 level= (level*qscale*quant_matrix[j])>>4;
677 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
683 CLOSE_READER(re, &s->gb);
685 s->block_last_index[n] = i;
689 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
693 int level, i, j, run;
694 RLTable *rl = &ff_rl_mpeg1;
695 uint8_t * const scantable= s->intra_scantable.permutated;
696 const uint16_t *quant_matrix= s->inter_matrix;
697 const int qscale= s->qscale;
700 OPEN_READER(re, &s->gb);
702 // special case for first coefficient, no need to add second VLC table
703 UPDATE_CACHE(re, &s->gb);
704 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
705 level= (3*qscale*quant_matrix[0])>>5;
707 if(GET_CACHE(re, &s->gb)&0x40000000)
711 SKIP_BITS(re, &s->gb, 2);
712 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
715 #if MIN_CACHE_BITS < 19
716 UPDATE_CACHE(re, &s->gb);
718 /* now quantify & encode AC coefficients */
720 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
725 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
727 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
728 SKIP_BITS(re, &s->gb, 1);
731 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
732 UPDATE_CACHE(re, &s->gb);
733 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
735 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
736 } else if (level == 0) {
737 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
743 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
747 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
752 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
757 #if MIN_CACHE_BITS < 19
758 UPDATE_CACHE(re, &s->gb);
760 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
762 #if MIN_CACHE_BITS >= 19
763 UPDATE_CACHE(re, &s->gb);
767 LAST_SKIP_BITS(re, &s->gb, 2);
768 CLOSE_READER(re, &s->gb);
770 s->block_last_index[n] = i;
774 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
776 int level, i, j, run;
777 RLTable *rl = &ff_rl_mpeg1;
778 uint8_t * const scantable= s->intra_scantable.permutated;
779 const int qscale= s->qscale;
782 OPEN_READER(re, &s->gb);
784 // special case for first coefficient, no need to add second VLC table
785 UPDATE_CACHE(re, &s->gb);
786 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
787 level= (3*qscale)>>1;
789 if(GET_CACHE(re, &s->gb)&0x40000000)
793 SKIP_BITS(re, &s->gb, 2);
794 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
797 #if MIN_CACHE_BITS < 19
798 UPDATE_CACHE(re, &s->gb);
801 /* now quantify & encode AC coefficients */
803 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
808 level= ((level*2+1)*qscale)>>1;
810 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
811 SKIP_BITS(re, &s->gb, 1);
814 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
815 UPDATE_CACHE(re, &s->gb);
816 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
818 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
819 } else if (level == 0) {
820 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
826 level= ((level*2+1)*qscale)>>1;
830 level= ((level*2+1)*qscale)>>1;
836 #if MIN_CACHE_BITS < 19
837 UPDATE_CACHE(re, &s->gb);
839 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
841 #if MIN_CACHE_BITS >= 19
842 UPDATE_CACHE(re, &s->gb);
846 LAST_SKIP_BITS(re, &s->gb, 2);
847 CLOSE_READER(re, &s->gb);
849 s->block_last_index[n] = i;
854 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
858 int level, i, j, run;
859 RLTable *rl = &ff_rl_mpeg1;
860 uint8_t * const scantable= s->intra_scantable.permutated;
861 const uint16_t *quant_matrix;
862 const int qscale= s->qscale;
868 OPEN_READER(re, &s->gb);
871 quant_matrix = s->inter_matrix;
873 quant_matrix = s->chroma_inter_matrix;
875 // special case for first coefficient, no need to add second VLC table
876 UPDATE_CACHE(re, &s->gb);
877 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
878 level= (3*qscale*quant_matrix[0])>>5;
879 if(GET_CACHE(re, &s->gb)&0x40000000)
884 SKIP_BITS(re, &s->gb, 2);
885 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
888 #if MIN_CACHE_BITS < 19
889 UPDATE_CACHE(re, &s->gb);
892 /* now quantify & encode AC coefficients */
894 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
899 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
900 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
901 SKIP_BITS(re, &s->gb, 1);
904 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
905 UPDATE_CACHE(re, &s->gb);
906 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
911 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
914 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
918 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
924 #if MIN_CACHE_BITS < 19
925 UPDATE_CACHE(re, &s->gb);
927 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
929 #if MIN_CACHE_BITS >= 19
930 UPDATE_CACHE(re, &s->gb);
934 LAST_SKIP_BITS(re, &s->gb, 2);
935 CLOSE_READER(re, &s->gb);
937 block[63] ^= (mismatch & 1);
939 s->block_last_index[n] = i;
943 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
947 int level, i, j, run;
948 RLTable *rl = &ff_rl_mpeg1;
949 uint8_t * const scantable= s->intra_scantable.permutated;
950 const int qscale= s->qscale;
951 OPEN_READER(re, &s->gb);
954 // special case for first coefficient, no need to add second VLC table
955 UPDATE_CACHE(re, &s->gb);
956 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
957 level= (3*qscale)>>1;
958 if(GET_CACHE(re, &s->gb)&0x40000000)
962 SKIP_BITS(re, &s->gb, 2);
963 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
966 #if MIN_CACHE_BITS < 19
967 UPDATE_CACHE(re, &s->gb);
970 /* now quantify & encode AC coefficients */
972 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
977 level= ((level*2+1)*qscale)>>1;
978 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
979 SKIP_BITS(re, &s->gb, 1);
982 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
983 UPDATE_CACHE(re, &s->gb);
984 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
989 level= ((-level*2+1)*qscale)>>1;
992 level= ((level*2+1)*qscale)>>1;
997 #if MIN_CACHE_BITS < 19
998 UPDATE_CACHE(re, &s->gb);
1000 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1002 #if MIN_CACHE_BITS >=19
1003 UPDATE_CACHE(re, &s->gb);
1007 LAST_SKIP_BITS(re, &s->gb, 2);
1008 CLOSE_READER(re, &s->gb);
1009 s->block_last_index[n] = i;
1014 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1018 int level, dc, diff, i, j, run;
1021 uint8_t * const scantable= s->intra_scantable.permutated;
1022 const uint16_t *quant_matrix;
1023 const int qscale= s->qscale;
1026 /* DC coefficient */
1028 quant_matrix = s->intra_matrix;
1031 quant_matrix = s->chroma_intra_matrix;
1032 component = (n&1) + 1;
1034 diff = decode_dc(&s->gb, component);
1037 dc = s->last_dc[component];
1039 s->last_dc[component] = dc;
1040 block[0] = dc << (3 - s->intra_dc_precision);
1041 dprintf(s->avctx, "dc=%d\n", block[0]);
1042 mismatch = block[0] ^ 1;
1044 if (s->intra_vlc_format)
1050 OPEN_READER(re, &s->gb);
1051 /* now quantify & encode AC coefficients */
1053 UPDATE_CACHE(re, &s->gb);
1054 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1058 } else if(level != 0) {
1061 level= (level*qscale*quant_matrix[j])>>4;
1062 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1063 LAST_SKIP_BITS(re, &s->gb, 1);
1066 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1067 UPDATE_CACHE(re, &s->gb);
1068 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1072 level= (-level*qscale*quant_matrix[j])>>4;
1075 level= (level*qscale*quant_matrix[j])>>4;
1079 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1086 CLOSE_READER(re, &s->gb);
1088 block[63]^= mismatch&1;
1090 s->block_last_index[n] = i;
1094 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1098 int level, dc, diff, j, run;
1101 uint8_t * scantable= s->intra_scantable.permutated;
1102 const uint16_t *quant_matrix;
1103 const int qscale= s->qscale;
1105 /* DC coefficient */
1107 quant_matrix = s->intra_matrix;
1110 quant_matrix = s->chroma_intra_matrix;
1111 component = (n&1) + 1;
1113 diff = decode_dc(&s->gb, component);
1116 dc = s->last_dc[component];
1118 s->last_dc[component] = dc;
1119 block[0] = dc << (3 - s->intra_dc_precision);
1120 if (s->intra_vlc_format)
1126 OPEN_READER(re, &s->gb);
1127 /* now quantify & encode AC coefficients */
1129 UPDATE_CACHE(re, &s->gb);
1130 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1134 } else if(level != 0) {
1137 level= (level*qscale*quant_matrix[j])>>4;
1138 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1139 LAST_SKIP_BITS(re, &s->gb, 1);
1142 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1143 UPDATE_CACHE(re, &s->gb);
1144 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1148 level= (-level*qscale*quant_matrix[j])>>4;
1151 level= (level*qscale*quant_matrix[j])>>4;
1157 CLOSE_READER(re, &s->gb);
1160 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1164 typedef struct Mpeg1Context {
1165 MpegEncContext mpeg_enc_ctx;
1166 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1167 int repeat_field; /* true if we must repeat the field */
1168 AVPanScan pan_scan; /** some temporary storage for the panscan */
1170 int swap_uv;//indicate VCR2
1171 int save_aspect_info;
1172 int save_width, save_height;
1173 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1177 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1179 Mpeg1Context *s = avctx->priv_data;
1180 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1183 /* we need some permutation to store matrices,
1184 * until MPV_common_init() sets the real permutation. */
1186 s2->dsp.idct_permutation[i]=i;
1188 MPV_decode_defaults(s2);
1190 s->mpeg_enc_ctx.avctx= avctx;
1191 s->mpeg_enc_ctx.flags= avctx->flags;
1192 s->mpeg_enc_ctx.flags2= avctx->flags2;
1193 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1194 ff_mpeg12_init_vlcs();
1196 s->mpeg_enc_ctx_allocated = 0;
1197 s->mpeg_enc_ctx.picture_number = 0;
1198 s->repeat_field = 0;
1199 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1203 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1204 const uint8_t *new_perm){
1205 uint16_t temp_matrix[64];
1208 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1211 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1215 /* Call this function when we know all parameters.
1216 * It may be called in different places for MPEG-1 and MPEG-2. */
1217 static int mpeg_decode_postinit(AVCodecContext *avctx){
1218 Mpeg1Context *s1 = avctx->priv_data;
1219 MpegEncContext *s = &s1->mpeg_enc_ctx;
1220 uint8_t old_permutation[64];
1223 (s1->mpeg_enc_ctx_allocated == 0)||
1224 avctx->coded_width != s->width ||
1225 avctx->coded_height != s->height||
1226 s1->save_width != s->width ||
1227 s1->save_height != s->height ||
1228 s1->save_aspect_info != s->aspect_ratio_info||
1232 if (s1->mpeg_enc_ctx_allocated) {
1233 ParseContext pc= s->parse_context;
1234 s->parse_context.buffer=0;
1236 s->parse_context= pc;
1239 if( (s->width == 0 )||(s->height == 0))
1242 avcodec_set_dimensions(avctx, s->width, s->height);
1243 avctx->bit_rate = s->bit_rate;
1244 s1->save_aspect_info = s->aspect_ratio_info;
1245 s1->save_width = s->width;
1246 s1->save_height = s->height;
1248 /* low_delay may be forced, in this case we will have B-frames
1249 * that behave like P-frames. */
1250 avctx->has_b_frames = !(s->low_delay);
1252 if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1254 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1255 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1257 avctx->sample_aspect_ratio= av_d2q(
1258 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1263 &s->avctx->time_base.den,
1264 &s->avctx->time_base.num,
1265 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1266 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1269 if(s->aspect_ratio_info > 1){
1270 //we ignore the spec here as reality does not match the spec, see for example
1271 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1272 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1273 s->avctx->sample_aspect_ratio=
1275 ff_mpeg2_aspect[s->aspect_ratio_info],
1276 (AVRational){s->width, s->height}
1279 s->avctx->sample_aspect_ratio=
1281 ff_mpeg2_aspect[s->aspect_ratio_info],
1282 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1286 s->avctx->sample_aspect_ratio=
1287 ff_mpeg2_aspect[s->aspect_ratio_info];
1291 if(avctx->xvmc_acceleration){
1292 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1294 if(s->chroma_format < 2){
1295 avctx->pix_fmt = PIX_FMT_YUV420P;
1297 if(s->chroma_format == 2){
1298 avctx->pix_fmt = PIX_FMT_YUV422P;
1300 if(s->chroma_format > 2){
1301 avctx->pix_fmt = PIX_FMT_YUV444P;
1304 //until then pix_fmt may be changed right after codec init
1305 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1306 if( avctx->idct_algo == FF_IDCT_AUTO )
1307 avctx->idct_algo = FF_IDCT_SIMPLE;
1309 /* Quantization matrices may need reordering
1310 * if DCT permutation is changed. */
1311 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1313 if (MPV_common_init(s) < 0)
1316 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1317 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1318 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1319 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1321 s1->mpeg_enc_ctx_allocated = 1;
1326 static int mpeg1_decode_picture(AVCodecContext *avctx,
1327 const uint8_t *buf, int buf_size)
1329 Mpeg1Context *s1 = avctx->priv_data;
1330 MpegEncContext *s = &s1->mpeg_enc_ctx;
1331 int ref, f_code, vbv_delay;
1333 if(mpeg_decode_postinit(s->avctx) < 0)
1336 init_get_bits(&s->gb, buf, buf_size*8);
1338 ref = get_bits(&s->gb, 10); /* temporal ref */
1339 s->pict_type = get_bits(&s->gb, 3);
1340 if(s->pict_type == 0 || s->pict_type > 3)
1343 vbv_delay= get_bits(&s->gb, 16);
1344 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1345 s->full_pel[0] = get_bits1(&s->gb);
1346 f_code = get_bits(&s->gb, 3);
1347 if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1349 s->mpeg_f_code[0][0] = f_code;
1350 s->mpeg_f_code[0][1] = f_code;
1352 if (s->pict_type == FF_B_TYPE) {
1353 s->full_pel[1] = get_bits1(&s->gb);
1354 f_code = get_bits(&s->gb, 3);
1355 if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1357 s->mpeg_f_code[1][0] = f_code;
1358 s->mpeg_f_code[1][1] = f_code;
1360 s->current_picture.pict_type= s->pict_type;
1361 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1363 if(avctx->debug & FF_DEBUG_PICT_INFO)
1364 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1372 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1374 MpegEncContext *s= &s1->mpeg_enc_ctx;
1375 int horiz_size_ext, vert_size_ext;
1378 skip_bits(&s->gb, 1); /* profile and level esc*/
1379 s->avctx->profile= get_bits(&s->gb, 3);
1380 s->avctx->level= get_bits(&s->gb, 4);
1381 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1382 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1383 horiz_size_ext = get_bits(&s->gb, 2);
1384 vert_size_ext = get_bits(&s->gb, 2);
1385 s->width |= (horiz_size_ext << 12);
1386 s->height |= (vert_size_ext << 12);
1387 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1388 s->bit_rate += (bit_rate_ext << 18) * 400;
1389 skip_bits1(&s->gb); /* marker */
1390 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1392 s->low_delay = get_bits1(&s->gb);
1393 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1395 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1396 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1398 dprintf(s->avctx, "sequence extension\n");
1399 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1400 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1402 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1403 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1404 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1408 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1410 MpegEncContext *s= &s1->mpeg_enc_ctx;
1411 int color_description, w, h;
1413 skip_bits(&s->gb, 3); /* video format */
1414 color_description= get_bits1(&s->gb);
1415 if(color_description){
1416 skip_bits(&s->gb, 8); /* color primaries */
1417 skip_bits(&s->gb, 8); /* transfer_characteristics */
1418 skip_bits(&s->gb, 8); /* matrix_coefficients */
1420 w= get_bits(&s->gb, 14);
1421 skip_bits(&s->gb, 1); //marker
1422 h= get_bits(&s->gb, 14);
1423 skip_bits(&s->gb, 1); //marker
1425 s1->pan_scan.width= 16*w;
1426 s1->pan_scan.height=16*h;
1428 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1429 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1432 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1434 MpegEncContext *s= &s1->mpeg_enc_ctx;
1438 if(s->progressive_sequence){
1439 if(s->repeat_first_field){
1441 if(s->top_field_first)
1445 if(s->picture_structure == PICT_FRAME){
1447 if(s->repeat_first_field)
1451 for(i=0; i<nofco; i++){
1452 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1453 skip_bits(&s->gb, 1); //marker
1454 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1455 skip_bits(&s->gb, 1); //marker
1458 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1459 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1460 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1461 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1462 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1466 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1470 dprintf(s->avctx, "matrix extension\n");
1472 if (get_bits1(&s->gb)) {
1474 v = get_bits(&s->gb, 8);
1475 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1476 s->intra_matrix[j] = v;
1477 s->chroma_intra_matrix[j] = v;
1480 if (get_bits1(&s->gb)) {
1482 v = get_bits(&s->gb, 8);
1483 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1484 s->inter_matrix[j] = v;
1485 s->chroma_inter_matrix[j] = v;
1488 if (get_bits1(&s->gb)) {
1490 v = get_bits(&s->gb, 8);
1491 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1492 s->chroma_intra_matrix[j] = v;
1495 if (get_bits1(&s->gb)) {
1497 v = get_bits(&s->gb, 8);
1498 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1499 s->chroma_inter_matrix[j] = v;
1504 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1506 s->full_pel[0] = s->full_pel[1] = 0;
1507 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1508 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1509 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1510 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1511 s->intra_dc_precision = get_bits(&s->gb, 2);
1512 s->picture_structure = get_bits(&s->gb, 2);
1513 s->top_field_first = get_bits1(&s->gb);
1514 s->frame_pred_frame_dct = get_bits1(&s->gb);
1515 s->concealment_motion_vectors = get_bits1(&s->gb);
1516 s->q_scale_type = get_bits1(&s->gb);
1517 s->intra_vlc_format = get_bits1(&s->gb);
1518 s->alternate_scan = get_bits1(&s->gb);
1519 s->repeat_first_field = get_bits1(&s->gb);
1520 s->chroma_420_type = get_bits1(&s->gb);
1521 s->progressive_frame = get_bits1(&s->gb);
1523 if(s->picture_structure == PICT_FRAME){
1525 s->v_edge_pos= 16*s->mb_height;
1527 s->first_field ^= 1;
1528 s->v_edge_pos= 8*s->mb_height;
1529 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1532 if(s->alternate_scan){
1533 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1534 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1536 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1537 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1540 /* composite display not parsed */
1541 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1542 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1543 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1544 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1545 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1546 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1547 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1548 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1549 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1552 static void mpeg_decode_extension(AVCodecContext *avctx,
1553 const uint8_t *buf, int buf_size)
1555 Mpeg1Context *s1 = avctx->priv_data;
1556 MpegEncContext *s = &s1->mpeg_enc_ctx;
1559 init_get_bits(&s->gb, buf, buf_size*8);
1561 ext_type = get_bits(&s->gb, 4);
1564 mpeg_decode_sequence_extension(s1);
1567 mpeg_decode_sequence_display_extension(s1);
1570 mpeg_decode_quant_matrix_extension(s);
1573 mpeg_decode_picture_display_extension(s1);
1576 mpeg_decode_picture_coding_extension(s);
1581 static void exchange_uv(MpegEncContext *s){
1582 short * tmp = s->pblocks[4];
1583 s->pblocks[4] = s->pblocks[5];
1584 s->pblocks[5] = tmp;
1587 static int mpeg_field_start(MpegEncContext *s){
1588 AVCodecContext *avctx= s->avctx;
1589 Mpeg1Context *s1 = (Mpeg1Context*)s;
1591 /* start frame decoding */
1592 if(s->first_field || s->picture_structure==PICT_FRAME){
1593 if(MPV_frame_start(s, avctx) < 0)
1596 ff_er_frame_start(s);
1598 /* first check if we must repeat the frame */
1599 s->current_picture_ptr->repeat_pict = 0;
1600 if (s->repeat_first_field) {
1601 if (s->progressive_sequence) {
1602 if (s->top_field_first)
1603 s->current_picture_ptr->repeat_pict = 4;
1605 s->current_picture_ptr->repeat_pict = 2;
1606 } else if (s->progressive_frame) {
1607 s->current_picture_ptr->repeat_pict = 1;
1611 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1612 }else{ //second field
1615 if(!s->current_picture_ptr){
1616 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1621 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1622 if(s->picture_structure == PICT_BOTTOM_FIELD){
1623 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1628 // MPV_frame_start will call this function too,
1629 // but we need to call it on every field
1630 if(s->avctx->xvmc_acceleration)
1631 XVMC_field_start(s,avctx);
1637 #define DECODE_SLICE_ERROR -1
1638 #define DECODE_SLICE_OK 0
1641 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1642 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1643 * DECODE_SLICE_OK if this slice is ok<br>
1645 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1646 const uint8_t **buf, int buf_size)
1648 MpegEncContext *s = &s1->mpeg_enc_ctx;
1649 AVCodecContext *avctx= s->avctx;
1650 const int field_pic= s->picture_structure != PICT_FRAME;
1651 const int lowres= s->avctx->lowres;
1656 if (mb_y<<field_pic >= s->mb_height){
1657 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1661 init_get_bits(&s->gb, *buf, buf_size*8);
1663 ff_mpeg1_clean_buffers(s);
1664 s->interlaced_dct = 0;
1666 s->qscale = get_qscale(s);
1669 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1673 /* extra slice info */
1674 while (get_bits1(&s->gb) != 0) {
1675 skip_bits(&s->gb, 8);
1681 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1683 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1690 /* otherwise, stuffing, nothing to do */
1696 if(s->mb_x >= (unsigned)s->mb_width){
1697 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1701 s->resync_mb_x= s->mb_x;
1702 s->resync_mb_y= s->mb_y= mb_y;
1704 ff_init_block_index(s);
1706 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1707 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1708 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1709 s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
1710 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1711 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1712 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1713 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1719 //If 1, we memcpy blocks in xvmcvideo.
1720 if(s->avctx->xvmc_acceleration > 1)
1721 XVMC_init_block(s);//set s->block
1724 if(mpeg_decode_mb(s, s->block) < 0)
1727 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1728 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1729 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1730 int motion_x, motion_y, dir, i;
1731 if(field_pic && !s->first_field)
1735 for(dir=0; dir<2; dir++){
1736 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1737 motion_x = motion_y = 0;
1738 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1739 motion_x = s->mv[dir][0][0];
1740 motion_y = s->mv[dir][0][1];
1741 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1742 motion_x = s->mv[dir][i][0];
1743 motion_y = s->mv[dir][i][1];
1746 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1747 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1748 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1749 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1750 s->current_picture.ref_index [dir][xy ]=
1751 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1752 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1758 s->dest[0] += 16 >> lowres;
1759 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1760 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1762 MPV_decode_mb(s, s->block);
1764 if (++s->mb_x >= s->mb_width) {
1765 const int mb_size= 16>>s->avctx->lowres;
1767 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1772 if(s->mb_y<<field_pic >= s->mb_height){
1773 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1774 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1775 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1776 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1778 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1779 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1780 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1786 ff_init_block_index(s);
1789 /* skip mb handling */
1790 if (s->mb_skip_run == -1) {
1791 /* read increment again */
1794 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1796 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1801 s->mb_skip_run += 33;
1802 }else if(code == 35){
1803 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1804 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1807 goto eos; /* end of slice */
1809 /* otherwise, stuffing, nothing to do */
1811 s->mb_skip_run += code;
1817 if(s->pict_type == FF_I_TYPE){
1818 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1825 s->block_last_index[i] = -1;
1826 if(s->picture_structure == PICT_FRAME)
1827 s->mv_type = MV_TYPE_16X16;
1829 s->mv_type = MV_TYPE_FIELD;
1830 if (s->pict_type == FF_P_TYPE) {
1831 /* if P type, zero motion vector is implied */
1832 s->mv_dir = MV_DIR_FORWARD;
1833 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1834 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1835 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1836 s->field_select[0][0]= s->picture_structure - 1;
1838 /* if B type, reuse previous vectors and directions */
1839 s->mv[0][0][0] = s->last_mv[0][0][0];
1840 s->mv[0][0][1] = s->last_mv[0][0][1];
1841 s->mv[1][0][0] = s->last_mv[1][0][0];
1842 s->mv[1][0][1] = s->last_mv[1][0][1];
1847 eos: // end of slice
1848 *buf += (get_bits_count(&s->gb)-1)/8;
1849 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1853 static int slice_decode_thread(AVCodecContext *c, void *arg){
1854 MpegEncContext *s= arg;
1855 const uint8_t *buf= s->gb.buffer;
1856 int mb_y= s->start_mb_y;
1858 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1861 uint32_t start_code;
1864 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1866 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1867 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1869 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1870 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1872 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1875 if(s->mb_y == s->end_mb_y)
1879 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1880 mb_y= start_code - SLICE_MIN_START_CODE;
1881 if(mb_y < 0 || mb_y >= s->end_mb_y)
1885 return 0; //not reached
1889 * Handles slice ends.
1890 * @return 1 if it seems to be the last slice
1892 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1894 Mpeg1Context *s1 = avctx->priv_data;
1895 MpegEncContext *s = &s1->mpeg_enc_ctx;
1897 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1901 if(s->avctx->xvmc_acceleration)
1904 /* end of slice reached */
1905 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1908 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1914 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1915 *pict= *(AVFrame*)s->current_picture_ptr;
1916 ff_print_debug_info(s, pict);
1918 s->picture_number++;
1919 /* latency of 1 frame for I- and P-frames */
1920 /* XXX: use another variable than picture_number */
1921 if (s->last_picture_ptr != NULL) {
1922 *pict= *(AVFrame*)s->last_picture_ptr;
1923 ff_print_debug_info(s, pict);
1933 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1934 const uint8_t *buf, int buf_size)
1936 Mpeg1Context *s1 = avctx->priv_data;
1937 MpegEncContext *s = &s1->mpeg_enc_ctx;
1941 init_get_bits(&s->gb, buf, buf_size*8);
1943 width = get_bits(&s->gb, 12);
1944 height = get_bits(&s->gb, 12);
1945 if (width <= 0 || height <= 0)
1947 s->aspect_ratio_info= get_bits(&s->gb, 4);
1948 if (s->aspect_ratio_info == 0) {
1949 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1950 if (avctx->error_resilience >= FF_ER_COMPLIANT)
1953 s->frame_rate_index = get_bits(&s->gb, 4);
1954 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1956 s->bit_rate = get_bits(&s->gb, 18) * 400;
1957 if (get_bits1(&s->gb) == 0) /* marker */
1962 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1963 skip_bits(&s->gb, 1);
1966 if (get_bits1(&s->gb)) {
1968 v = get_bits(&s->gb, 8);
1970 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1973 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1974 s->intra_matrix[j] = v;
1975 s->chroma_intra_matrix[j] = v;
1978 dprintf(s->avctx, "intra matrix present\n");
1980 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1981 dprintf(s->avctx, "\n");
1985 j = s->dsp.idct_permutation[i];
1986 v = ff_mpeg1_default_intra_matrix[i];
1987 s->intra_matrix[j] = v;
1988 s->chroma_intra_matrix[j] = v;
1991 if (get_bits1(&s->gb)) {
1993 v = get_bits(&s->gb, 8);
1995 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1998 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1999 s->inter_matrix[j] = v;
2000 s->chroma_inter_matrix[j] = v;
2003 dprintf(s->avctx, "non-intra matrix present\n");
2005 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2006 dprintf(s->avctx, "\n");
2010 int j= s->dsp.idct_permutation[i];
2011 v = ff_mpeg1_default_non_intra_matrix[i];
2012 s->inter_matrix[j] = v;
2013 s->chroma_inter_matrix[j] = v;
2017 if(show_bits(&s->gb, 23) != 0){
2018 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2022 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2023 s->progressive_sequence = 1;
2024 s->progressive_frame = 1;
2025 s->picture_structure = PICT_FRAME;
2026 s->frame_pred_frame_dct = 1;
2027 s->chroma_format = 1;
2028 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2029 avctx->sub_id = 1; /* indicates MPEG-1 */
2030 s->out_format = FMT_MPEG1;
2031 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2032 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2034 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2035 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2036 s->avctx->rc_buffer_size, s->bit_rate);
2041 static int vcr2_init_sequence(AVCodecContext *avctx)
2043 Mpeg1Context *s1 = avctx->priv_data;
2044 MpegEncContext *s = &s1->mpeg_enc_ctx;
2047 /* start new MPEG-1 context decoding */
2048 s->out_format = FMT_MPEG1;
2049 if (s1->mpeg_enc_ctx_allocated) {
2052 s->width = avctx->coded_width;
2053 s->height = avctx->coded_height;
2054 avctx->has_b_frames= 0; //true?
2057 if(avctx->xvmc_acceleration){
2058 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2060 avctx->pix_fmt = PIX_FMT_YUV420P;
2063 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2064 if( avctx->idct_algo == FF_IDCT_AUTO )
2065 avctx->idct_algo = FF_IDCT_SIMPLE;
2067 if (MPV_common_init(s) < 0)
2069 exchange_uv(s);//common init reset pblocks, so we swap them here
2070 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2071 s1->mpeg_enc_ctx_allocated = 1;
2074 int j= s->dsp.idct_permutation[i];
2075 v = ff_mpeg1_default_intra_matrix[i];
2076 s->intra_matrix[j] = v;
2077 s->chroma_intra_matrix[j] = v;
2079 v = ff_mpeg1_default_non_intra_matrix[i];
2080 s->inter_matrix[j] = v;
2081 s->chroma_inter_matrix[j] = v;
2084 s->progressive_sequence = 1;
2085 s->progressive_frame = 1;
2086 s->picture_structure = PICT_FRAME;
2087 s->frame_pred_frame_dct = 1;
2088 s->chroma_format = 1;
2089 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2090 avctx->sub_id = 2; /* indicates MPEG-2 */
2095 static void mpeg_decode_user_data(AVCodecContext *avctx,
2096 const uint8_t *buf, int buf_size)
2103 /* we parse the DTG active format information */
2105 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2119 avctx->dtg_active_format = p[0] & 0x0f;
2124 static void mpeg_decode_gop(AVCodecContext *avctx,
2125 const uint8_t *buf, int buf_size){
2126 Mpeg1Context *s1 = avctx->priv_data;
2127 MpegEncContext *s = &s1->mpeg_enc_ctx;
2129 int drop_frame_flag;
2130 int time_code_hours, time_code_minutes;
2131 int time_code_seconds, time_code_pictures;
2132 int closed_gop, broken_link;
2134 init_get_bits(&s->gb, buf, buf_size*8);
2136 drop_frame_flag = get_bits1(&s->gb);
2138 time_code_hours=get_bits(&s->gb,5);
2139 time_code_minutes = get_bits(&s->gb,6);
2140 skip_bits1(&s->gb);//marker bit
2141 time_code_seconds = get_bits(&s->gb,6);
2142 time_code_pictures = get_bits(&s->gb,6);
2144 closed_gop = get_bits1(&s->gb);
2145 /*broken_link indicate that after editing the
2146 reference frames of the first B-Frames after GOP I-Frame
2147 are missing (open gop)*/
2148 broken_link = get_bits1(&s->gb);
2150 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2151 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2152 time_code_hours, time_code_minutes, time_code_seconds,
2153 time_code_pictures, closed_gop, broken_link);
2156 * Finds the end of the current frame in the bitstream.
2157 * @return the position of the first byte of the next frame, or -1
2159 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2162 uint32_t state= pc->state;
2164 /* EOF considered as end of frame */
2169 0 frame start -> 1/4
2170 1 first_SEQEXT -> 0/2
2171 2 first field start -> 3/0
2172 3 second_SEQEXT -> 2/0
2176 for(i=0; i<buf_size; i++){
2177 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2178 if(pc->frame_start_found&1){
2179 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2180 pc->frame_start_found--;
2181 else if(state == EXT_START_CODE+2){
2182 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2183 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2187 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2188 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2190 pc->frame_start_found=4;
2192 if(state == SEQ_END_CODE){
2196 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2197 pc->frame_start_found= 0;
2198 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2199 pc->frame_start_found++;
2200 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2201 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2202 pc->frame_start_found=0;
2210 return END_NOT_FOUND;
2213 static int decode_chunks(AVCodecContext *avctx,
2214 AVFrame *picture, int *data_size,
2215 const uint8_t *buf, int buf_size);
2217 /* handle buffering and image synchronisation */
2218 static int mpeg_decode_frame(AVCodecContext *avctx,
2219 void *data, int *data_size,
2220 const uint8_t *buf, int buf_size)
2222 Mpeg1Context *s = avctx->priv_data;
2223 AVFrame *picture = data;
2224 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2225 dprintf(avctx, "fill_buffer\n");
2227 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2228 /* special case for last picture */
2229 if (s2->low_delay==0 && s2->next_picture_ptr) {
2230 *picture= *(AVFrame*)s2->next_picture_ptr;
2231 s2->next_picture_ptr= NULL;
2233 *data_size = sizeof(AVFrame);
2238 if(s2->flags&CODEC_FLAG_TRUNCATED){
2239 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2241 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2246 if (s->repeat_field % 2 == 1) {
2248 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2249 // s2->picture_number, s->repeat_field);
2250 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2251 *data_size = sizeof(AVPicture);
2257 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2258 vcr2_init_sequence(avctx);
2262 if(avctx->extradata && !avctx->frame_number)
2263 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2265 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2268 static int decode_chunks(AVCodecContext *avctx,
2269 AVFrame *picture, int *data_size,
2270 const uint8_t *buf, int buf_size)
2272 Mpeg1Context *s = avctx->priv_data;
2273 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2274 const uint8_t *buf_ptr = buf;
2275 const uint8_t *buf_end = buf + buf_size;
2276 int ret, input_size;
2279 /* find next start code */
2280 uint32_t start_code = -1;
2281 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2282 if (start_code > 0x1ff){
2283 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2284 if(avctx->thread_count > 1){
2287 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2288 for(i=0; i<s->slice_count; i++)
2289 s2->error_count += s2->thread_context[i]->error_count;
2291 if (slice_end(avctx, picture)) {
2292 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2293 *data_size = sizeof(AVPicture);
2296 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2299 input_size = buf_end - buf_ptr;
2301 if(avctx->debug & FF_DEBUG_STARTCODE){
2302 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2305 /* prepare data for next start code */
2306 switch(start_code) {
2307 case SEQ_START_CODE:
2308 mpeg1_decode_sequence(avctx, buf_ptr,
2312 case PICTURE_START_CODE:
2313 /* we have a complete image: we try to decompress it */
2314 mpeg1_decode_picture(avctx,
2315 buf_ptr, input_size);
2317 case EXT_START_CODE:
2318 mpeg_decode_extension(avctx,
2319 buf_ptr, input_size);
2321 case USER_START_CODE:
2322 mpeg_decode_user_data(avctx,
2323 buf_ptr, input_size);
2325 case GOP_START_CODE:
2327 mpeg_decode_gop(avctx,
2328 buf_ptr, input_size);
2331 if (start_code >= SLICE_MIN_START_CODE &&
2332 start_code <= SLICE_MAX_START_CODE) {
2333 int mb_y= start_code - SLICE_MIN_START_CODE;
2335 if(s2->last_picture_ptr==NULL){
2336 /* Skip B-frames if we do not have reference frames. */
2337 if(s2->pict_type==FF_B_TYPE) break;
2339 if(s2->next_picture_ptr==NULL){
2340 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2341 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2343 /* Skip B-frames if we are in a hurry. */
2344 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2345 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2346 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2347 || avctx->skip_frame >= AVDISCARD_ALL)
2349 /* Skip everything if we are in a hurry>=5. */
2350 if(avctx->hurry_up>=5) break;
2352 if (!s->mpeg_enc_ctx_allocated) break;
2354 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2355 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2359 if(s2->first_slice){
2361 if(mpeg_field_start(s2) < 0)
2364 if(!s2->current_picture_ptr){
2365 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2369 if(avctx->thread_count > 1){
2370 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2371 if(threshold <= mb_y){
2372 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2374 thread_context->start_mb_y= mb_y;
2375 thread_context->end_mb_y = s2->mb_height;
2377 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2378 ff_update_duplicate_context(thread_context, s2);
2380 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2383 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2385 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2389 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2390 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2392 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2401 static int mpeg_decode_end(AVCodecContext *avctx)
2403 Mpeg1Context *s = avctx->priv_data;
2405 if (s->mpeg_enc_ctx_allocated)
2406 MPV_common_end(&s->mpeg_enc_ctx);
2410 AVCodec mpeg1video_decoder = {
2413 CODEC_ID_MPEG1VIDEO,
2414 sizeof(Mpeg1Context),
2419 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2420 .flush= ff_mpeg_flush,
2421 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2424 AVCodec mpeg2video_decoder = {
2427 CODEC_ID_MPEG2VIDEO,
2428 sizeof(Mpeg1Context),
2433 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2434 .flush= ff_mpeg_flush,
2435 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2439 AVCodec mpegvideo_decoder = {
2442 CODEC_ID_MPEG2VIDEO,
2443 sizeof(Mpeg1Context),
2448 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2449 .flush= ff_mpeg_flush,
2450 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2454 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2457 if( avctx->thread_count > 1)
2459 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2461 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2462 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2464 mpeg_decode_init(avctx);
2465 s = avctx->priv_data;
2467 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2468 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2473 AVCodec mpeg_xvmc_decoder = {
2476 CODEC_ID_MPEG2VIDEO_XVMC,
2477 sizeof(Mpeg1Context),
2478 mpeg_mc_decode_init,
2482 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2483 .flush= ff_mpeg_flush,
2484 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),