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
24 * @file libavcodec/mpeg12.c
31 #include "mpegvideo.h"
34 #include "mpeg12data.h"
35 #include "mpeg12decdata.h"
36 #include "bytestream.h"
37 #include "vdpau_internal.h"
44 #define MBINCR_VLC_BITS 9
45 #define MB_PAT_VLC_BITS 9
46 #define MB_PTYPE_VLC_BITS 6
47 #define MB_BTYPE_VLC_BITS 6
49 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
52 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
55 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
56 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
59 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
62 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
63 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
64 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
65 static void exchange_uv(MpegEncContext *s);
67 int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
68 int XVMC_field_end(MpegEncContext *s);
69 void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
70 void XVMC_init_block(MpegEncContext *s);//set s->block
72 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
73 PIX_FMT_XVMC_MPEG2_IDCT,
74 PIX_FMT_XVMC_MPEG2_MC,
77 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
80 #define INIT_2D_VLC_RL(rl, static_size)\
82 static RL_VLC_ELEM rl_vlc_table[static_size];\
83 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
84 &rl.table_vlc[0][1], 4, 2,\
85 &rl.table_vlc[0][0], 4, 2, static_size);\
87 rl.rl_vlc[0]= rl_vlc_table;\
91 static void init_2d_vlc_rl(RLTable *rl)
95 for(i=0; i<rl->vlc.table_size; i++){
96 int code= rl->vlc.table[i][0];
97 int len = rl->vlc.table[i][1];
100 if(len==0){ // illegal code
103 }else if(len<0){ //more bits needed
107 if(code==rl->n){ //esc
110 }else if(code==rl->n+1){ //eob
114 run= rl->table_run [code] + 1;
115 level= rl->table_level[code];
118 rl->rl_vlc[0][i].len= len;
119 rl->rl_vlc[0][i].level= level;
120 rl->rl_vlc[0][i].run= run;
124 void ff_mpeg12_common_init(MpegEncContext *s)
128 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
132 void ff_mpeg1_clean_buffers(MpegEncContext *s){
133 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
134 s->last_dc[1] = s->last_dc[0];
135 s->last_dc[2] = s->last_dc[0];
136 memset(s->last_mv, 0, sizeof(s->last_mv));
140 /******************************************/
144 static VLC mbincr_vlc;
145 static VLC mb_ptype_vlc;
146 static VLC mb_btype_vlc;
147 static VLC mb_pat_vlc;
149 av_cold void ff_mpeg12_init_vlcs(void)
156 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
157 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
158 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
159 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
160 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
161 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
162 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
163 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
164 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
165 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
166 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
167 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
168 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
169 &ff_mpeg12_mbPatTable[0][1], 2, 1,
170 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
172 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
173 &table_mb_ptype[0][1], 2, 1,
174 &table_mb_ptype[0][0], 2, 1, 64);
175 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
176 &table_mb_btype[0][1], 2, 1,
177 &table_mb_btype[0][0], 2, 1, 64);
178 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
179 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
181 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
182 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
186 static inline int get_dmv(MpegEncContext *s)
188 if(get_bits1(&s->gb))
189 return 1 - (get_bits1(&s->gb) << 1);
194 static inline int get_qscale(MpegEncContext *s)
196 int qscale = get_bits(&s->gb, 5);
197 if (s->q_scale_type) {
198 return non_linear_qscale[qscale];
204 /* motion type (for MPEG-2) */
210 static int mpeg_decode_mb(MpegEncContext *s,
211 DCTELEM block[12][64])
213 int i, j, k, cbp, val, mb_type, motion_type;
214 const int mb_block_count = 4 + (1<< s->chroma_format);
216 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
218 assert(s->mb_skipped==0);
220 if (s->mb_skip_run-- != 0) {
221 if (s->pict_type == FF_P_TYPE) {
223 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
228 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
230 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
231 if(IS_INTRA(mb_type))
234 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
235 mb_type | MB_TYPE_SKIP;
236 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
238 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
245 switch(s->pict_type) {
248 if (get_bits1(&s->gb) == 0) {
249 if (get_bits1(&s->gb) == 0){
250 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
253 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
255 mb_type = MB_TYPE_INTRA;
259 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
261 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
264 mb_type = ptype2mb_type[ mb_type ];
267 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
269 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
272 mb_type = btype2mb_type[ mb_type ];
275 dprintf(s->avctx, "mb_type=%x\n", mb_type);
276 // motion_type = 0; /* avoid warning */
277 if (IS_INTRA(mb_type)) {
278 s->dsp.clear_blocks(s->block[0]);
280 if(!s->chroma_y_shift){
281 s->dsp.clear_blocks(s->block[6]);
284 /* compute DCT type */
285 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
286 !s->frame_pred_frame_dct) {
287 s->interlaced_dct = get_bits1(&s->gb);
290 if (IS_QUANT(mb_type))
291 s->qscale = get_qscale(s);
293 if (s->concealment_motion_vectors) {
294 /* just parse them */
295 if (s->picture_structure != PICT_FRAME)
296 skip_bits1(&s->gb); /* field select */
298 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
299 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
300 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
301 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
303 skip_bits1(&s->gb); /* marker */
305 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
308 //if 1, we memcpy blocks in xvmcvideo
309 if(s->avctx->xvmc_acceleration > 1){
310 XVMC_pack_pblocks(s,-1);//inter are always full blocks
317 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
318 if(s->flags2 & CODEC_FLAG2_FAST){
320 mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
323 for(i=0;i<mb_block_count;i++) {
324 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
330 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
335 if (mb_type & MB_TYPE_ZERO_MV){
336 assert(mb_type & MB_TYPE_CBP);
338 s->mv_dir = MV_DIR_FORWARD;
339 if(s->picture_structure == PICT_FRAME){
340 if(!s->frame_pred_frame_dct)
341 s->interlaced_dct = get_bits1(&s->gb);
342 s->mv_type = MV_TYPE_16X16;
344 s->mv_type = MV_TYPE_FIELD;
345 mb_type |= MB_TYPE_INTERLACED;
346 s->field_select[0][0]= s->picture_structure - 1;
349 if (IS_QUANT(mb_type))
350 s->qscale = get_qscale(s);
352 s->last_mv[0][0][0] = 0;
353 s->last_mv[0][0][1] = 0;
354 s->last_mv[0][1][0] = 0;
355 s->last_mv[0][1][1] = 0;
359 assert(mb_type & MB_TYPE_L0L1);
360 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
361 /* get additional motion vector type */
362 if (s->frame_pred_frame_dct)
363 motion_type = MT_FRAME;
365 motion_type = get_bits(&s->gb, 2);
366 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
367 s->interlaced_dct = get_bits1(&s->gb);
370 if (IS_QUANT(mb_type))
371 s->qscale = get_qscale(s);
374 s->mv_dir= (mb_type>>13)&3;
375 dprintf(s->avctx, "motion_type=%d\n", motion_type);
376 switch(motion_type) {
377 case MT_FRAME: /* or MT_16X8 */
378 if (s->picture_structure == PICT_FRAME) {
379 mb_type |= MB_TYPE_16x16;
380 s->mv_type = MV_TYPE_16X16;
382 if (USES_LIST(mb_type, i)) {
384 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
385 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
386 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
387 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
388 /* full_pel: only for MPEG-1 */
390 s->mv[i][0][0] <<= 1;
391 s->mv[i][0][1] <<= 1;
396 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
397 s->mv_type = MV_TYPE_16X8;
399 if (USES_LIST(mb_type, i)) {
402 s->field_select[i][j] = get_bits1(&s->gb);
404 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
405 s->last_mv[i][j][k]);
406 s->last_mv[i][j][k] = val;
407 s->mv[i][j][k] = val;
415 s->mv_type = MV_TYPE_FIELD;
416 if (s->picture_structure == PICT_FRAME) {
417 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
419 if (USES_LIST(mb_type, i)) {
421 s->field_select[i][j] = get_bits1(&s->gb);
422 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
423 s->last_mv[i][j][0]);
424 s->last_mv[i][j][0] = val;
425 s->mv[i][j][0] = val;
426 dprintf(s->avctx, "fmx=%d\n", val);
427 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
428 s->last_mv[i][j][1] >> 1);
429 s->last_mv[i][j][1] = val << 1;
430 s->mv[i][j][1] = val;
431 dprintf(s->avctx, "fmy=%d\n", val);
436 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
438 if (USES_LIST(mb_type, i)) {
439 s->field_select[i][0] = get_bits1(&s->gb);
441 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
442 s->last_mv[i][0][k]);
443 s->last_mv[i][0][k] = val;
444 s->last_mv[i][1][k] = val;
445 s->mv[i][0][k] = val;
452 s->mv_type = MV_TYPE_DMV;
454 if (USES_LIST(mb_type, i)) {
455 int dmx, dmy, mx, my, m;
456 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
457 s->last_mv[i][0][0]);
458 s->last_mv[i][0][0] = mx;
459 s->last_mv[i][1][0] = mx;
461 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
462 s->last_mv[i][0][1] >> 1);
466 s->last_mv[i][0][1] = my<<1;
467 s->last_mv[i][1][1] = my<<1;
471 s->mv[i][1][0] = mx;//not used
472 s->mv[i][1][1] = my;//not used
474 if (s->picture_structure == PICT_FRAME) {
475 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
477 //m = 1 + 2 * s->top_field_first;
478 m = s->top_field_first ? 1 : 3;
480 /* top -> top pred */
481 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
484 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
485 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
487 mb_type |= MB_TYPE_16x16;
489 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
490 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
491 if(s->picture_structure == PICT_TOP_FIELD)
500 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
506 if (HAS_CBP(mb_type)) {
507 s->dsp.clear_blocks(s->block[0]);
509 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
510 if(mb_block_count > 6){
511 cbp<<= mb_block_count-6;
512 cbp |= get_bits(&s->gb, mb_block_count-6);
513 s->dsp.clear_blocks(s->block[6]);
516 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
521 //if 1, we memcpy blocks in xvmcvideo
522 if(s->avctx->xvmc_acceleration > 1){
523 XVMC_pack_pblocks(s,cbp);
530 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
531 if(s->flags2 & CODEC_FLAG2_FAST){
534 mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
536 s->block_last_index[i] = -1;
541 cbp<<= 12-mb_block_count;
543 for(i=0;i<mb_block_count;i++) {
544 if ( cbp & (1<<11) ) {
545 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
548 s->block_last_index[i] = -1;
554 if(s->flags2 & CODEC_FLAG2_FAST){
557 mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
559 s->block_last_index[i] = -1;
566 if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
569 s->block_last_index[i] = -1;
577 s->block_last_index[i] = -1;
581 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
586 /* as H.263, but only 17 codes */
587 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
589 int code, sign, val, l, shift;
591 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
599 sign = get_bits1(&s->gb);
603 val = (val - 1) << shift;
604 val |= get_bits(&s->gb, shift);
611 /* modulo decoding */
612 l= INT_BIT - 5 - shift;
617 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
621 int level, dc, diff, i, j, run;
623 RLTable *rl = &ff_rl_mpeg1;
624 uint8_t * const scantable= s->intra_scantable.permutated;
625 const uint16_t *quant_matrix= s->intra_matrix;
626 const int qscale= s->qscale;
629 component = (n <= 3 ? 0 : n - 4 + 1);
630 diff = decode_dc(&s->gb, component);
633 dc = s->last_dc[component];
635 s->last_dc[component] = dc;
637 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
640 OPEN_READER(re, &s->gb);
641 /* now quantify & encode AC coefficients */
643 UPDATE_CACHE(re, &s->gb);
644 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
648 } else if(level != 0) {
651 level= (level*qscale*quant_matrix[j])>>4;
653 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
654 LAST_SKIP_BITS(re, &s->gb, 1);
657 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
658 UPDATE_CACHE(re, &s->gb);
659 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
661 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
662 } else if (level == 0) {
663 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
669 level= (level*qscale*quant_matrix[j])>>4;
673 level= (level*qscale*quant_matrix[j])>>4;
678 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
684 CLOSE_READER(re, &s->gb);
686 s->block_last_index[n] = i;
690 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
694 int level, i, j, run;
695 RLTable *rl = &ff_rl_mpeg1;
696 uint8_t * const scantable= s->intra_scantable.permutated;
697 const uint16_t *quant_matrix= s->inter_matrix;
698 const int qscale= s->qscale;
701 OPEN_READER(re, &s->gb);
703 // special case for first coefficient, no need to add second VLC table
704 UPDATE_CACHE(re, &s->gb);
705 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
706 level= (3*qscale*quant_matrix[0])>>5;
708 if(GET_CACHE(re, &s->gb)&0x40000000)
712 SKIP_BITS(re, &s->gb, 2);
713 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
716 #if MIN_CACHE_BITS < 19
717 UPDATE_CACHE(re, &s->gb);
719 /* now quantify & encode AC coefficients */
721 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
726 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
728 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
729 SKIP_BITS(re, &s->gb, 1);
732 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
733 UPDATE_CACHE(re, &s->gb);
734 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
736 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
737 } else if (level == 0) {
738 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
744 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
748 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
753 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
758 #if MIN_CACHE_BITS < 19
759 UPDATE_CACHE(re, &s->gb);
761 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
763 #if MIN_CACHE_BITS >= 19
764 UPDATE_CACHE(re, &s->gb);
768 LAST_SKIP_BITS(re, &s->gb, 2);
769 CLOSE_READER(re, &s->gb);
771 s->block_last_index[n] = i;
775 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
777 int level, i, j, run;
778 RLTable *rl = &ff_rl_mpeg1;
779 uint8_t * const scantable= s->intra_scantable.permutated;
780 const int qscale= s->qscale;
783 OPEN_READER(re, &s->gb);
785 // special case for first coefficient, no need to add second VLC table
786 UPDATE_CACHE(re, &s->gb);
787 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
788 level= (3*qscale)>>1;
790 if(GET_CACHE(re, &s->gb)&0x40000000)
794 SKIP_BITS(re, &s->gb, 2);
795 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
798 #if MIN_CACHE_BITS < 19
799 UPDATE_CACHE(re, &s->gb);
802 /* now quantify & encode AC coefficients */
804 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
809 level= ((level*2+1)*qscale)>>1;
811 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
812 SKIP_BITS(re, &s->gb, 1);
815 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
816 UPDATE_CACHE(re, &s->gb);
817 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
819 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
820 } else if (level == 0) {
821 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
827 level= ((level*2+1)*qscale)>>1;
831 level= ((level*2+1)*qscale)>>1;
837 #if MIN_CACHE_BITS < 19
838 UPDATE_CACHE(re, &s->gb);
840 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
842 #if MIN_CACHE_BITS >= 19
843 UPDATE_CACHE(re, &s->gb);
847 LAST_SKIP_BITS(re, &s->gb, 2);
848 CLOSE_READER(re, &s->gb);
850 s->block_last_index[n] = i;
855 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
859 int level, i, j, run;
860 RLTable *rl = &ff_rl_mpeg1;
861 uint8_t * const scantable= s->intra_scantable.permutated;
862 const uint16_t *quant_matrix;
863 const int qscale= s->qscale;
869 OPEN_READER(re, &s->gb);
872 quant_matrix = s->inter_matrix;
874 quant_matrix = s->chroma_inter_matrix;
876 // special case for first coefficient, no need to add second VLC table
877 UPDATE_CACHE(re, &s->gb);
878 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
879 level= (3*qscale*quant_matrix[0])>>5;
880 if(GET_CACHE(re, &s->gb)&0x40000000)
885 SKIP_BITS(re, &s->gb, 2);
886 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
889 #if MIN_CACHE_BITS < 19
890 UPDATE_CACHE(re, &s->gb);
893 /* now quantify & encode AC coefficients */
895 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
900 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
901 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
902 SKIP_BITS(re, &s->gb, 1);
905 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
906 UPDATE_CACHE(re, &s->gb);
907 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
912 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
915 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
919 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
925 #if MIN_CACHE_BITS < 19
926 UPDATE_CACHE(re, &s->gb);
928 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
930 #if MIN_CACHE_BITS >= 19
931 UPDATE_CACHE(re, &s->gb);
935 LAST_SKIP_BITS(re, &s->gb, 2);
936 CLOSE_READER(re, &s->gb);
938 block[63] ^= (mismatch & 1);
940 s->block_last_index[n] = i;
944 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
948 int level, i, j, run;
949 RLTable *rl = &ff_rl_mpeg1;
950 uint8_t * const scantable= s->intra_scantable.permutated;
951 const int qscale= s->qscale;
952 OPEN_READER(re, &s->gb);
955 // special case for first coefficient, no need to add second VLC table
956 UPDATE_CACHE(re, &s->gb);
957 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
958 level= (3*qscale)>>1;
959 if(GET_CACHE(re, &s->gb)&0x40000000)
963 SKIP_BITS(re, &s->gb, 2);
964 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
967 #if MIN_CACHE_BITS < 19
968 UPDATE_CACHE(re, &s->gb);
971 /* now quantify & encode AC coefficients */
973 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
978 level= ((level*2+1)*qscale)>>1;
979 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
980 SKIP_BITS(re, &s->gb, 1);
983 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
984 UPDATE_CACHE(re, &s->gb);
985 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
990 level= ((-level*2+1)*qscale)>>1;
993 level= ((level*2+1)*qscale)>>1;
998 #if MIN_CACHE_BITS < 19
999 UPDATE_CACHE(re, &s->gb);
1001 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1003 #if MIN_CACHE_BITS >=19
1004 UPDATE_CACHE(re, &s->gb);
1008 LAST_SKIP_BITS(re, &s->gb, 2);
1009 CLOSE_READER(re, &s->gb);
1010 s->block_last_index[n] = i;
1015 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1019 int level, dc, diff, i, j, run;
1022 uint8_t * const scantable= s->intra_scantable.permutated;
1023 const uint16_t *quant_matrix;
1024 const int qscale= s->qscale;
1027 /* DC coefficient */
1029 quant_matrix = s->intra_matrix;
1032 quant_matrix = s->chroma_intra_matrix;
1033 component = (n&1) + 1;
1035 diff = decode_dc(&s->gb, component);
1038 dc = s->last_dc[component];
1040 s->last_dc[component] = dc;
1041 block[0] = dc << (3 - s->intra_dc_precision);
1042 dprintf(s->avctx, "dc=%d\n", block[0]);
1043 mismatch = block[0] ^ 1;
1045 if (s->intra_vlc_format)
1051 OPEN_READER(re, &s->gb);
1052 /* now quantify & encode AC coefficients */
1054 UPDATE_CACHE(re, &s->gb);
1055 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1059 } else if(level != 0) {
1062 level= (level*qscale*quant_matrix[j])>>4;
1063 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1064 LAST_SKIP_BITS(re, &s->gb, 1);
1067 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1068 UPDATE_CACHE(re, &s->gb);
1069 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1073 level= (-level*qscale*quant_matrix[j])>>4;
1076 level= (level*qscale*quant_matrix[j])>>4;
1080 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1087 CLOSE_READER(re, &s->gb);
1089 block[63]^= mismatch&1;
1091 s->block_last_index[n] = i;
1095 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1099 int level, dc, diff, j, run;
1102 uint8_t * scantable= s->intra_scantable.permutated;
1103 const uint16_t *quant_matrix;
1104 const int qscale= s->qscale;
1106 /* DC coefficient */
1108 quant_matrix = s->intra_matrix;
1111 quant_matrix = s->chroma_intra_matrix;
1112 component = (n&1) + 1;
1114 diff = decode_dc(&s->gb, component);
1117 dc = s->last_dc[component];
1119 s->last_dc[component] = dc;
1120 block[0] = dc << (3 - s->intra_dc_precision);
1121 if (s->intra_vlc_format)
1127 OPEN_READER(re, &s->gb);
1128 /* now quantify & encode AC coefficients */
1130 UPDATE_CACHE(re, &s->gb);
1131 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1135 } else if(level != 0) {
1138 level= (level*qscale*quant_matrix[j])>>4;
1139 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1140 LAST_SKIP_BITS(re, &s->gb, 1);
1143 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1144 UPDATE_CACHE(re, &s->gb);
1145 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1149 level= (-level*qscale*quant_matrix[j])>>4;
1152 level= (level*qscale*quant_matrix[j])>>4;
1158 CLOSE_READER(re, &s->gb);
1161 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1165 typedef struct Mpeg1Context {
1166 MpegEncContext mpeg_enc_ctx;
1167 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1168 int repeat_field; /* true if we must repeat the field */
1169 AVPanScan pan_scan; /** some temporary storage for the panscan */
1171 int swap_uv;//indicate VCR2
1172 int save_aspect_info;
1173 int save_width, save_height;
1174 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1178 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1180 Mpeg1Context *s = avctx->priv_data;
1181 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1184 /* we need some permutation to store matrices,
1185 * until MPV_common_init() sets the real permutation. */
1187 s2->dsp.idct_permutation[i]=i;
1189 MPV_decode_defaults(s2);
1191 s->mpeg_enc_ctx.avctx= avctx;
1192 s->mpeg_enc_ctx.flags= avctx->flags;
1193 s->mpeg_enc_ctx.flags2= avctx->flags2;
1194 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1195 ff_mpeg12_init_vlcs();
1197 s->mpeg_enc_ctx_allocated = 0;
1198 s->mpeg_enc_ctx.picture_number = 0;
1199 s->repeat_field = 0;
1200 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1204 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1205 const uint8_t *new_perm){
1206 uint16_t temp_matrix[64];
1209 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1212 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1216 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1217 Mpeg1Context *s1 = avctx->priv_data;
1218 MpegEncContext *s = &s1->mpeg_enc_ctx;
1220 if(avctx->xvmc_acceleration)
1221 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1222 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1223 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1224 return PIX_FMT_VDPAU_MPEG1;
1226 return PIX_FMT_VDPAU_MPEG2;
1228 if(s->chroma_format < 2)
1229 return PIX_FMT_YUV420P;
1230 else if(s->chroma_format == 2)
1231 return PIX_FMT_YUV422P;
1233 return PIX_FMT_YUV444P;
1237 /* Call this function when we know all parameters.
1238 * It may be called in different places for MPEG-1 and MPEG-2. */
1239 static int mpeg_decode_postinit(AVCodecContext *avctx){
1240 Mpeg1Context *s1 = avctx->priv_data;
1241 MpegEncContext *s = &s1->mpeg_enc_ctx;
1242 uint8_t old_permutation[64];
1245 (s1->mpeg_enc_ctx_allocated == 0)||
1246 avctx->coded_width != s->width ||
1247 avctx->coded_height != s->height||
1248 s1->save_width != s->width ||
1249 s1->save_height != s->height ||
1250 s1->save_aspect_info != s->aspect_ratio_info||
1254 if (s1->mpeg_enc_ctx_allocated) {
1255 ParseContext pc= s->parse_context;
1256 s->parse_context.buffer=0;
1258 s->parse_context= pc;
1261 if( (s->width == 0 )||(s->height == 0))
1264 avcodec_set_dimensions(avctx, s->width, s->height);
1265 avctx->bit_rate = s->bit_rate;
1266 s1->save_aspect_info = s->aspect_ratio_info;
1267 s1->save_width = s->width;
1268 s1->save_height = s->height;
1270 /* low_delay may be forced, in this case we will have B-frames
1271 * that behave like P-frames. */
1272 avctx->has_b_frames = !(s->low_delay);
1274 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1275 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1277 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1278 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1280 avctx->sample_aspect_ratio= av_d2q(
1281 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1286 &s->avctx->time_base.den,
1287 &s->avctx->time_base.num,
1288 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1289 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1292 if(s->aspect_ratio_info > 1){
1293 //we ignore the spec here as reality does not match the spec, see for example
1294 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1295 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1296 s->avctx->sample_aspect_ratio=
1298 ff_mpeg2_aspect[s->aspect_ratio_info],
1299 (AVRational){s->width, s->height}
1302 s->avctx->sample_aspect_ratio=
1304 ff_mpeg2_aspect[s->aspect_ratio_info],
1305 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1309 s->avctx->sample_aspect_ratio=
1310 ff_mpeg2_aspect[s->aspect_ratio_info];
1314 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1315 //until then pix_fmt may be changed right after codec init
1316 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1317 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1318 if( avctx->idct_algo == FF_IDCT_AUTO )
1319 avctx->idct_algo = FF_IDCT_SIMPLE;
1321 /* Quantization matrices may need reordering
1322 * if DCT permutation is changed. */
1323 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1325 if (MPV_common_init(s) < 0)
1328 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1329 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1330 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1331 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1333 s1->mpeg_enc_ctx_allocated = 1;
1338 static int mpeg1_decode_picture(AVCodecContext *avctx,
1339 const uint8_t *buf, int buf_size)
1341 Mpeg1Context *s1 = avctx->priv_data;
1342 MpegEncContext *s = &s1->mpeg_enc_ctx;
1343 int ref, f_code, vbv_delay;
1345 if(mpeg_decode_postinit(s->avctx) < 0)
1348 init_get_bits(&s->gb, buf, buf_size*8);
1350 ref = get_bits(&s->gb, 10); /* temporal ref */
1351 s->pict_type = get_bits(&s->gb, 3);
1352 if(s->pict_type == 0 || s->pict_type > 3)
1355 vbv_delay= get_bits(&s->gb, 16);
1356 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1357 s->full_pel[0] = get_bits1(&s->gb);
1358 f_code = get_bits(&s->gb, 3);
1359 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1361 s->mpeg_f_code[0][0] = f_code;
1362 s->mpeg_f_code[0][1] = f_code;
1364 if (s->pict_type == FF_B_TYPE) {
1365 s->full_pel[1] = get_bits1(&s->gb);
1366 f_code = get_bits(&s->gb, 3);
1367 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1369 s->mpeg_f_code[1][0] = f_code;
1370 s->mpeg_f_code[1][1] = f_code;
1372 s->current_picture.pict_type= s->pict_type;
1373 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1375 if(avctx->debug & FF_DEBUG_PICT_INFO)
1376 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1384 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1386 MpegEncContext *s= &s1->mpeg_enc_ctx;
1387 int horiz_size_ext, vert_size_ext;
1390 skip_bits(&s->gb, 1); /* profile and level esc*/
1391 s->avctx->profile= get_bits(&s->gb, 3);
1392 s->avctx->level= get_bits(&s->gb, 4);
1393 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1394 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1395 horiz_size_ext = get_bits(&s->gb, 2);
1396 vert_size_ext = get_bits(&s->gb, 2);
1397 s->width |= (horiz_size_ext << 12);
1398 s->height |= (vert_size_ext << 12);
1399 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1400 s->bit_rate += (bit_rate_ext << 18) * 400;
1401 skip_bits1(&s->gb); /* marker */
1402 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1404 s->low_delay = get_bits1(&s->gb);
1405 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1407 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1408 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1410 dprintf(s->avctx, "sequence extension\n");
1411 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1412 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1414 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1415 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1416 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1420 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1422 MpegEncContext *s= &s1->mpeg_enc_ctx;
1423 int color_description, w, h;
1425 skip_bits(&s->gb, 3); /* video format */
1426 color_description= get_bits1(&s->gb);
1427 if(color_description){
1428 skip_bits(&s->gb, 8); /* color primaries */
1429 skip_bits(&s->gb, 8); /* transfer_characteristics */
1430 skip_bits(&s->gb, 8); /* matrix_coefficients */
1432 w= get_bits(&s->gb, 14);
1433 skip_bits(&s->gb, 1); //marker
1434 h= get_bits(&s->gb, 14);
1435 skip_bits(&s->gb, 1); //marker
1437 s1->pan_scan.width= 16*w;
1438 s1->pan_scan.height=16*h;
1440 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1441 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1444 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1446 MpegEncContext *s= &s1->mpeg_enc_ctx;
1450 if(s->progressive_sequence){
1451 if(s->repeat_first_field){
1453 if(s->top_field_first)
1457 if(s->picture_structure == PICT_FRAME){
1459 if(s->repeat_first_field)
1463 for(i=0; i<nofco; i++){
1464 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1465 skip_bits(&s->gb, 1); //marker
1466 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1467 skip_bits(&s->gb, 1); //marker
1470 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1471 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1472 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1473 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1474 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1478 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1482 dprintf(s->avctx, "matrix extension\n");
1484 if (get_bits1(&s->gb)) {
1486 v = get_bits(&s->gb, 8);
1487 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1488 s->intra_matrix[j] = v;
1489 s->chroma_intra_matrix[j] = v;
1492 if (get_bits1(&s->gb)) {
1494 v = get_bits(&s->gb, 8);
1495 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1496 s->inter_matrix[j] = v;
1497 s->chroma_inter_matrix[j] = v;
1500 if (get_bits1(&s->gb)) {
1502 v = get_bits(&s->gb, 8);
1503 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1504 s->chroma_intra_matrix[j] = v;
1507 if (get_bits1(&s->gb)) {
1509 v = get_bits(&s->gb, 8);
1510 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1511 s->chroma_inter_matrix[j] = v;
1516 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1518 MpegEncContext *s= &s1->mpeg_enc_ctx;
1520 s->full_pel[0] = s->full_pel[1] = 0;
1521 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1522 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1523 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1524 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1525 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1526 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1527 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1528 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1529 s->pict_type= FF_I_TYPE;
1531 s->pict_type= FF_P_TYPE;
1533 s->pict_type= FF_B_TYPE;
1534 s->current_picture.pict_type= s->pict_type;
1535 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1538 s->intra_dc_precision = get_bits(&s->gb, 2);
1539 s->picture_structure = get_bits(&s->gb, 2);
1540 s->top_field_first = get_bits1(&s->gb);
1541 s->frame_pred_frame_dct = get_bits1(&s->gb);
1542 s->concealment_motion_vectors = get_bits1(&s->gb);
1543 s->q_scale_type = get_bits1(&s->gb);
1544 s->intra_vlc_format = get_bits1(&s->gb);
1545 s->alternate_scan = get_bits1(&s->gb);
1546 s->repeat_first_field = get_bits1(&s->gb);
1547 s->chroma_420_type = get_bits1(&s->gb);
1548 s->progressive_frame = get_bits1(&s->gb);
1550 if(s->picture_structure == PICT_FRAME){
1552 s->v_edge_pos= 16*s->mb_height;
1554 s->first_field ^= 1;
1555 s->v_edge_pos= 8*s->mb_height;
1556 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1559 if(s->alternate_scan){
1560 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1561 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1563 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1564 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1567 /* composite display not parsed */
1568 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1569 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1570 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1571 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1572 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1573 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1574 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1575 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1576 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1579 static void mpeg_decode_extension(AVCodecContext *avctx,
1580 const uint8_t *buf, int buf_size)
1582 Mpeg1Context *s1 = avctx->priv_data;
1583 MpegEncContext *s = &s1->mpeg_enc_ctx;
1586 init_get_bits(&s->gb, buf, buf_size*8);
1588 ext_type = get_bits(&s->gb, 4);
1591 mpeg_decode_sequence_extension(s1);
1594 mpeg_decode_sequence_display_extension(s1);
1597 mpeg_decode_quant_matrix_extension(s);
1600 mpeg_decode_picture_display_extension(s1);
1603 mpeg_decode_picture_coding_extension(s1);
1608 static void exchange_uv(MpegEncContext *s){
1609 short * tmp = s->pblocks[4];
1610 s->pblocks[4] = s->pblocks[5];
1611 s->pblocks[5] = tmp;
1614 static int mpeg_field_start(MpegEncContext *s){
1615 AVCodecContext *avctx= s->avctx;
1616 Mpeg1Context *s1 = (Mpeg1Context*)s;
1618 /* start frame decoding */
1619 if(s->first_field || s->picture_structure==PICT_FRAME){
1620 if(MPV_frame_start(s, avctx) < 0)
1623 ff_er_frame_start(s);
1625 /* first check if we must repeat the frame */
1626 s->current_picture_ptr->repeat_pict = 0;
1627 if (s->repeat_first_field) {
1628 if (s->progressive_sequence) {
1629 if (s->top_field_first)
1630 s->current_picture_ptr->repeat_pict = 4;
1632 s->current_picture_ptr->repeat_pict = 2;
1633 } else if (s->progressive_frame) {
1634 s->current_picture_ptr->repeat_pict = 1;
1638 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1639 }else{ //second field
1642 if(!s->current_picture_ptr){
1643 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1648 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1649 if(s->picture_structure == PICT_BOTTOM_FIELD){
1650 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1655 // MPV_frame_start will call this function too,
1656 // but we need to call it on every field
1657 if(s->avctx->xvmc_acceleration)
1658 XVMC_field_start(s,avctx);
1664 #define DECODE_SLICE_ERROR -1
1665 #define DECODE_SLICE_OK 0
1668 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1669 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1670 * DECODE_SLICE_OK if this slice is ok<br>
1672 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1673 const uint8_t **buf, int buf_size)
1675 MpegEncContext *s = &s1->mpeg_enc_ctx;
1676 AVCodecContext *avctx= s->avctx;
1677 const int field_pic= s->picture_structure != PICT_FRAME;
1678 const int lowres= s->avctx->lowres;
1683 if (mb_y<<field_pic >= s->mb_height){
1684 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1688 init_get_bits(&s->gb, *buf, buf_size*8);
1690 ff_mpeg1_clean_buffers(s);
1691 s->interlaced_dct = 0;
1693 s->qscale = get_qscale(s);
1696 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1700 /* extra slice info */
1701 while (get_bits1(&s->gb) != 0) {
1702 skip_bits(&s->gb, 8);
1708 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1710 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1717 /* otherwise, stuffing, nothing to do */
1723 if(s->mb_x >= (unsigned)s->mb_width){
1724 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1728 s->resync_mb_x= s->mb_x;
1729 s->resync_mb_y= s->mb_y= mb_y;
1731 ff_init_block_index(s);
1733 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1734 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1735 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",
1736 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],
1737 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1738 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1739 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1740 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1746 //If 1, we memcpy blocks in xvmcvideo.
1747 if(s->avctx->xvmc_acceleration > 1)
1748 XVMC_init_block(s);//set s->block
1751 if(mpeg_decode_mb(s, s->block) < 0)
1754 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1755 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1756 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1757 int motion_x, motion_y, dir, i;
1758 if(field_pic && !s->first_field)
1762 for(dir=0; dir<2; dir++){
1763 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1764 motion_x = motion_y = 0;
1765 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1766 motion_x = s->mv[dir][0][0];
1767 motion_y = s->mv[dir][0][1];
1768 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1769 motion_x = s->mv[dir][i][0];
1770 motion_y = s->mv[dir][i][1];
1773 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1774 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1775 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1776 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1777 s->current_picture.ref_index [dir][xy ]=
1778 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1779 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1785 s->dest[0] += 16 >> lowres;
1786 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1787 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1789 MPV_decode_mb(s, s->block);
1791 if (++s->mb_x >= s->mb_width) {
1792 const int mb_size= 16>>s->avctx->lowres;
1794 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1799 if(s->mb_y<<field_pic >= s->mb_height){
1800 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1801 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1802 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1803 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1805 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1806 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1807 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1813 ff_init_block_index(s);
1816 /* skip mb handling */
1817 if (s->mb_skip_run == -1) {
1818 /* read increment again */
1821 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1823 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1828 s->mb_skip_run += 33;
1829 }else if(code == 35){
1830 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1831 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1834 goto eos; /* end of slice */
1836 /* otherwise, stuffing, nothing to do */
1838 s->mb_skip_run += code;
1844 if(s->pict_type == FF_I_TYPE){
1845 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1852 s->block_last_index[i] = -1;
1853 if(s->picture_structure == PICT_FRAME)
1854 s->mv_type = MV_TYPE_16X16;
1856 s->mv_type = MV_TYPE_FIELD;
1857 if (s->pict_type == FF_P_TYPE) {
1858 /* if P type, zero motion vector is implied */
1859 s->mv_dir = MV_DIR_FORWARD;
1860 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1861 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1862 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1863 s->field_select[0][0]= s->picture_structure - 1;
1865 /* if B type, reuse previous vectors and directions */
1866 s->mv[0][0][0] = s->last_mv[0][0][0];
1867 s->mv[0][0][1] = s->last_mv[0][0][1];
1868 s->mv[1][0][0] = s->last_mv[1][0][0];
1869 s->mv[1][0][1] = s->last_mv[1][0][1];
1874 eos: // end of slice
1875 *buf += (get_bits_count(&s->gb)-1)/8;
1876 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1880 static int slice_decode_thread(AVCodecContext *c, void *arg){
1881 MpegEncContext *s= *(void**)arg;
1882 const uint8_t *buf= s->gb.buffer;
1883 int mb_y= s->start_mb_y;
1885 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1888 uint32_t start_code;
1891 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1893 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1894 //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);
1896 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1897 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);
1899 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);
1902 if(s->mb_y == s->end_mb_y)
1906 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1907 mb_y= start_code - SLICE_MIN_START_CODE;
1908 if(mb_y < 0 || mb_y >= s->end_mb_y)
1912 return 0; //not reached
1916 * Handles slice ends.
1917 * @return 1 if it seems to be the last slice
1919 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1921 Mpeg1Context *s1 = avctx->priv_data;
1922 MpegEncContext *s = &s1->mpeg_enc_ctx;
1924 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1928 if(s->avctx->xvmc_acceleration)
1931 /* end of slice reached */
1932 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1935 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1941 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1942 *pict= *(AVFrame*)s->current_picture_ptr;
1943 ff_print_debug_info(s, pict);
1945 s->picture_number++;
1946 /* latency of 1 frame for I- and P-frames */
1947 /* XXX: use another variable than picture_number */
1948 if (s->last_picture_ptr != NULL) {
1949 *pict= *(AVFrame*)s->last_picture_ptr;
1950 ff_print_debug_info(s, pict);
1960 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1961 const uint8_t *buf, int buf_size)
1963 Mpeg1Context *s1 = avctx->priv_data;
1964 MpegEncContext *s = &s1->mpeg_enc_ctx;
1968 init_get_bits(&s->gb, buf, buf_size*8);
1970 width = get_bits(&s->gb, 12);
1971 height = get_bits(&s->gb, 12);
1972 if (width <= 0 || height <= 0)
1974 s->aspect_ratio_info= get_bits(&s->gb, 4);
1975 if (s->aspect_ratio_info == 0) {
1976 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1977 if (avctx->error_recognition >= FF_ER_COMPLIANT)
1980 s->frame_rate_index = get_bits(&s->gb, 4);
1981 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1983 s->bit_rate = get_bits(&s->gb, 18) * 400;
1984 if (get_bits1(&s->gb) == 0) /* marker */
1989 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1990 skip_bits(&s->gb, 1);
1993 if (get_bits1(&s->gb)) {
1995 v = get_bits(&s->gb, 8);
1997 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2000 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2001 s->intra_matrix[j] = v;
2002 s->chroma_intra_matrix[j] = v;
2005 dprintf(s->avctx, "intra matrix present\n");
2007 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2008 dprintf(s->avctx, "\n");
2012 j = s->dsp.idct_permutation[i];
2013 v = ff_mpeg1_default_intra_matrix[i];
2014 s->intra_matrix[j] = v;
2015 s->chroma_intra_matrix[j] = v;
2018 if (get_bits1(&s->gb)) {
2020 v = get_bits(&s->gb, 8);
2022 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2025 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2026 s->inter_matrix[j] = v;
2027 s->chroma_inter_matrix[j] = v;
2030 dprintf(s->avctx, "non-intra matrix present\n");
2032 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2033 dprintf(s->avctx, "\n");
2037 int j= s->dsp.idct_permutation[i];
2038 v = ff_mpeg1_default_non_intra_matrix[i];
2039 s->inter_matrix[j] = v;
2040 s->chroma_inter_matrix[j] = v;
2044 if(show_bits(&s->gb, 23) != 0){
2045 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2049 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2050 s->progressive_sequence = 1;
2051 s->progressive_frame = 1;
2052 s->picture_structure = PICT_FRAME;
2053 s->frame_pred_frame_dct = 1;
2054 s->chroma_format = 1;
2055 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2056 avctx->sub_id = 1; /* indicates MPEG-1 */
2057 s->out_format = FMT_MPEG1;
2058 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2059 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2061 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2062 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2063 s->avctx->rc_buffer_size, s->bit_rate);
2068 static int vcr2_init_sequence(AVCodecContext *avctx)
2070 Mpeg1Context *s1 = avctx->priv_data;
2071 MpegEncContext *s = &s1->mpeg_enc_ctx;
2074 /* start new MPEG-1 context decoding */
2075 s->out_format = FMT_MPEG1;
2076 if (s1->mpeg_enc_ctx_allocated) {
2079 s->width = avctx->coded_width;
2080 s->height = avctx->coded_height;
2081 avctx->has_b_frames= 0; //true?
2084 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2086 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
2087 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2088 if( avctx->idct_algo == FF_IDCT_AUTO )
2089 avctx->idct_algo = FF_IDCT_SIMPLE;
2091 if (MPV_common_init(s) < 0)
2093 exchange_uv(s);//common init reset pblocks, so we swap them here
2094 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2095 s1->mpeg_enc_ctx_allocated = 1;
2098 int j= s->dsp.idct_permutation[i];
2099 v = ff_mpeg1_default_intra_matrix[i];
2100 s->intra_matrix[j] = v;
2101 s->chroma_intra_matrix[j] = v;
2103 v = ff_mpeg1_default_non_intra_matrix[i];
2104 s->inter_matrix[j] = v;
2105 s->chroma_inter_matrix[j] = v;
2108 s->progressive_sequence = 1;
2109 s->progressive_frame = 1;
2110 s->picture_structure = PICT_FRAME;
2111 s->frame_pred_frame_dct = 1;
2112 s->chroma_format = 1;
2113 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2114 avctx->sub_id = 2; /* indicates MPEG-2 */
2119 static void mpeg_decode_user_data(AVCodecContext *avctx,
2120 const uint8_t *buf, int buf_size)
2127 /* we parse the DTG active format information */
2129 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2143 avctx->dtg_active_format = p[0] & 0x0f;
2148 static void mpeg_decode_gop(AVCodecContext *avctx,
2149 const uint8_t *buf, int buf_size){
2150 Mpeg1Context *s1 = avctx->priv_data;
2151 MpegEncContext *s = &s1->mpeg_enc_ctx;
2153 int drop_frame_flag;
2154 int time_code_hours, time_code_minutes;
2155 int time_code_seconds, time_code_pictures;
2156 int closed_gop, broken_link;
2158 init_get_bits(&s->gb, buf, buf_size*8);
2160 drop_frame_flag = get_bits1(&s->gb);
2162 time_code_hours=get_bits(&s->gb,5);
2163 time_code_minutes = get_bits(&s->gb,6);
2164 skip_bits1(&s->gb);//marker bit
2165 time_code_seconds = get_bits(&s->gb,6);
2166 time_code_pictures = get_bits(&s->gb,6);
2168 closed_gop = get_bits1(&s->gb);
2169 /*broken_link indicate that after editing the
2170 reference frames of the first B-Frames after GOP I-Frame
2171 are missing (open gop)*/
2172 broken_link = get_bits1(&s->gb);
2174 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2175 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2176 time_code_hours, time_code_minutes, time_code_seconds,
2177 time_code_pictures, closed_gop, broken_link);
2180 * Finds the end of the current frame in the bitstream.
2181 * @return the position of the first byte of the next frame, or -1
2183 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2186 uint32_t state= pc->state;
2188 /* EOF considered as end of frame */
2193 0 frame start -> 1/4
2194 1 first_SEQEXT -> 0/2
2195 2 first field start -> 3/0
2196 3 second_SEQEXT -> 2/0
2200 for(i=0; i<buf_size; i++){
2201 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2202 if(pc->frame_start_found&1){
2203 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2204 pc->frame_start_found--;
2205 else if(state == EXT_START_CODE+2){
2206 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2207 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2211 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2212 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2214 pc->frame_start_found=4;
2216 if(state == SEQ_END_CODE){
2220 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2221 pc->frame_start_found= 0;
2222 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2223 pc->frame_start_found++;
2224 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2225 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2226 pc->frame_start_found=0;
2234 return END_NOT_FOUND;
2237 static int decode_chunks(AVCodecContext *avctx,
2238 AVFrame *picture, int *data_size,
2239 const uint8_t *buf, int buf_size);
2241 /* handle buffering and image synchronisation */
2242 static int mpeg_decode_frame(AVCodecContext *avctx,
2243 void *data, int *data_size,
2244 const uint8_t *buf, int buf_size)
2246 Mpeg1Context *s = avctx->priv_data;
2247 AVFrame *picture = data;
2248 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2249 dprintf(avctx, "fill_buffer\n");
2251 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2252 /* special case for last picture */
2253 if (s2->low_delay==0 && s2->next_picture_ptr) {
2254 *picture= *(AVFrame*)s2->next_picture_ptr;
2255 s2->next_picture_ptr= NULL;
2257 *data_size = sizeof(AVFrame);
2262 if(s2->flags&CODEC_FLAG_TRUNCATED){
2263 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2265 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2270 if (s->repeat_field % 2 == 1) {
2272 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2273 // s2->picture_number, s->repeat_field);
2274 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2275 *data_size = sizeof(AVPicture);
2281 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2282 vcr2_init_sequence(avctx);
2286 if(avctx->extradata && !avctx->frame_number)
2287 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2289 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2292 static int decode_chunks(AVCodecContext *avctx,
2293 AVFrame *picture, int *data_size,
2294 const uint8_t *buf, int buf_size)
2296 Mpeg1Context *s = avctx->priv_data;
2297 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2298 const uint8_t *buf_ptr = buf;
2299 const uint8_t *buf_end = buf + buf_size;
2300 int ret, input_size;
2303 /* find next start code */
2304 uint32_t start_code = -1;
2305 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2306 if (start_code > 0x1ff){
2307 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2308 if(avctx->thread_count > 1){
2311 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2312 for(i=0; i<s->slice_count; i++)
2313 s2->error_count += s2->thread_context[i]->error_count;
2316 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2317 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2319 if (slice_end(avctx, picture)) {
2320 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2321 *data_size = sizeof(AVPicture);
2325 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2328 input_size = buf_end - buf_ptr;
2330 if(avctx->debug & FF_DEBUG_STARTCODE){
2331 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2334 /* prepare data for next start code */
2335 switch(start_code) {
2336 case SEQ_START_CODE:
2337 mpeg1_decode_sequence(avctx, buf_ptr,
2341 case PICTURE_START_CODE:
2342 /* we have a complete image: we try to decompress it */
2343 if(mpeg1_decode_picture(avctx,
2344 buf_ptr, input_size) < 0)
2347 case EXT_START_CODE:
2348 mpeg_decode_extension(avctx,
2349 buf_ptr, input_size);
2351 case USER_START_CODE:
2352 mpeg_decode_user_data(avctx,
2353 buf_ptr, input_size);
2355 case GOP_START_CODE:
2357 mpeg_decode_gop(avctx,
2358 buf_ptr, input_size);
2361 if (start_code >= SLICE_MIN_START_CODE &&
2362 start_code <= SLICE_MAX_START_CODE) {
2363 int mb_y= start_code - SLICE_MIN_START_CODE;
2365 if(s2->last_picture_ptr==NULL){
2366 /* Skip B-frames if we do not have reference frames. */
2367 if(s2->pict_type==FF_B_TYPE) break;
2369 if(s2->next_picture_ptr==NULL){
2370 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2371 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2373 /* Skip B-frames if we are in a hurry. */
2374 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2375 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2376 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2377 || avctx->skip_frame >= AVDISCARD_ALL)
2379 /* Skip everything if we are in a hurry>=5. */
2380 if(avctx->hurry_up>=5) break;
2382 if (!s->mpeg_enc_ctx_allocated) break;
2384 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2385 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2390 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2394 if(s2->first_slice){
2396 if(mpeg_field_start(s2) < 0)
2399 if(!s2->current_picture_ptr){
2400 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2404 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2409 if(avctx->thread_count > 1){
2410 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2411 if(threshold <= mb_y){
2412 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2414 thread_context->start_mb_y= mb_y;
2415 thread_context->end_mb_y = s2->mb_height;
2417 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2418 ff_update_duplicate_context(thread_context, s2);
2420 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2423 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2425 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2429 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2430 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);
2432 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);
2441 static int mpeg_decode_end(AVCodecContext *avctx)
2443 Mpeg1Context *s = avctx->priv_data;
2445 if (s->mpeg_enc_ctx_allocated)
2446 MPV_common_end(&s->mpeg_enc_ctx);
2450 AVCodec mpeg1video_decoder = {
2453 CODEC_ID_MPEG1VIDEO,
2454 sizeof(Mpeg1Context),
2459 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2460 .flush= ff_mpeg_flush,
2461 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2464 AVCodec mpeg2video_decoder = {
2467 CODEC_ID_MPEG2VIDEO,
2468 sizeof(Mpeg1Context),
2473 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2474 .flush= ff_mpeg_flush,
2475 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2479 AVCodec mpegvideo_decoder = {
2482 CODEC_ID_MPEG2VIDEO,
2483 sizeof(Mpeg1Context),
2488 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2489 .flush= ff_mpeg_flush,
2490 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2494 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2497 if( avctx->thread_count > 1)
2499 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2501 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2502 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2504 mpeg_decode_init(avctx);
2505 s = avctx->priv_data;
2507 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2508 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2513 AVCodec mpeg_xvmc_decoder = {
2516 CODEC_ID_MPEG2VIDEO_XVMC,
2517 sizeof(Mpeg1Context),
2518 mpeg_mc_decode_init,
2522 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2523 .flush= ff_mpeg_flush,
2524 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),
2529 #if CONFIG_MPEG_VDPAU_DECODER
2530 AVCodec mpeg_vdpau_decoder = {
2533 CODEC_ID_MPEG2VIDEO,
2534 sizeof(Mpeg1Context),
2539 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2540 .flush= ff_mpeg_flush,
2541 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2545 #if CONFIG_MPEG1_VDPAU_DECODER
2546 AVCodec mpeg1_vdpau_decoder = {
2549 CODEC_ID_MPEG1VIDEO,
2550 sizeof(Mpeg1Context),
2555 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2556 .flush= ff_mpeg_flush,
2557 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),