2 * MPEG1 codec / MPEG2 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * MPEG1 codec / MPEG2 decoder.
28 #include "mpegvideo.h"
30 #include "mpeg12data.h"
34 #define SEQ_END_CODE 0x000001b7
35 #define SEQ_START_CODE 0x000001b3
36 #define GOP_START_CODE 0x000001b8
37 #define PICTURE_START_CODE 0x00000100
38 #define SLICE_MIN_START_CODE 0x00000101
39 #define SLICE_MAX_START_CODE 0x000001af
40 #define EXT_START_CODE 0x000001b5
41 #define USER_START_CODE 0x000001b2
45 #define MBINCR_VLC_BITS 9
46 #define MB_PAT_VLC_BITS 9
47 #define MB_PTYPE_VLC_BITS 6
48 #define MB_BTYPE_VLC_BITS 6
49 #define TEX_VLC_BITS 9
51 static void mpeg1_encode_block(MpegEncContext *s,
54 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
55 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
56 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
59 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
62 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
65 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
68 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
70 #ifdef CONFIG_ENCODERS
71 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
72 static uint8_t fcode_tab[MAX_MV*2+1];
74 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
75 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
77 /* simple include everything table for dc, first byte is bits number next 3 are code*/
78 static uint32_t mpeg1_lum_dc_uni[512];
79 static uint32_t mpeg1_chr_dc_uni[512];
81 static uint8_t mpeg1_index_run[2][64];
82 static int8_t mpeg1_max_level[2][64];
85 static void init_2d_vlc_rl(RLTable *rl)
89 init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
90 &rl->table_vlc[0][1], 4, 2,
91 &rl->table_vlc[0][0], 4, 2);
94 rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
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 #ifdef CONFIG_ENCODERS
125 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
128 for(i=0; i<128; i++){
131 for(run=0; run<64; run++){
134 int alevel= ABS(level);
135 int sign= (level>>31)&1;
137 if (alevel > rl->max_level[0][run])
140 code= rl->index_run[0][run] + alevel - 1;
142 if (code < 111 /* rl->n */) {
143 /* store the vlc & sign at once */
144 len= mpeg1_vlc[code][1]+1;
145 bits= (mpeg1_vlc[code][0]<<1) + sign;
147 len= mpeg1_vlc[111/*rl->n*/][1]+6;
148 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
158 bits|= 0x8001 + level + 255;
160 bits|= level & 0xffff;
165 uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
166 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
171 static void put_header(MpegEncContext *s, int header)
173 align_put_bits(&s->pb);
174 put_bits(&s->pb, 16, header>>16);
175 put_bits(&s->pb, 16, header&0xFFFF);
178 /* put sequence header if needed */
179 static void mpeg1_encode_sequence_header(MpegEncContext *s)
181 unsigned int vbv_buffer_size;
185 float best_aspect_error= 1E10;
186 float aspect_ratio= s->avctx->aspect_ratio;
188 if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
190 if (s->current_picture.key_frame) {
191 /* mpeg1 header repeated every gop */
192 put_header(s, SEQ_START_CODE);
194 /* search closest frame rate */
197 s->frame_rate_index = 0;
200 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
202 d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
205 s->frame_rate_index = i;
210 put_bits(&s->pb, 12, s->width);
211 put_bits(&s->pb, 12, s->height);
214 float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
217 if(error < best_aspect_error){
218 best_aspect_error= error;
219 s->aspect_ratio_info= i;
223 put_bits(&s->pb, 4, s->aspect_ratio_info);
224 put_bits(&s->pb, 4, s->frame_rate_index);
225 v = (s->bit_rate + 399) / 400;
228 put_bits(&s->pb, 18, v);
229 put_bits(&s->pb, 1, 1); /* marker */
231 if(s->avctx->rc_buffer_size)
232 vbv_buffer_size = s->avctx->rc_buffer_size;
234 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
235 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
236 put_bits(&s->pb, 10, (vbv_buffer_size + 16383) / 16384);
237 put_bits(&s->pb, 1, 1); /* constrained parameter flag */
238 put_bits(&s->pb, 1, 0); /* no custom intra matrix */
239 put_bits(&s->pb, 1, 0); /* no custom non intra matrix */
241 put_header(s, GOP_START_CODE);
242 put_bits(&s->pb, 1, 0); /* do drop frame */
243 /* time code : we must convert from the real frame rate to a
244 fake mpeg frame rate in case of low frame rate */
245 fps = frame_rate_tab[s->frame_rate_index];
246 time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
247 s->gop_picture_number = s->fake_picture_number;
248 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
249 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
250 put_bits(&s->pb, 1, 1);
251 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
252 put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
253 put_bits(&s->pb, 1, 1); /* closed gop */
254 put_bits(&s->pb, 1, 0); /* broken link */
257 if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
258 /* insert empty P pictures to slow down to the desired
259 frame rate. Each fake pictures takes about 20 bytes */
260 fps = frame_rate_tab[s->frame_rate_index];
261 n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
262 while (s->fake_picture_number < n) {
263 mpeg1_skip_picture(s, s->fake_picture_number -
264 s->gop_picture_number);
265 s->fake_picture_number++;
271 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
273 put_bits(&s->pb, 11, 0x008);
276 put_bits(&s->pb, mbAddrIncrTable[run][1],
277 mbAddrIncrTable[run][0]);
280 /* insert a fake P picture */
281 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
283 /* mpeg1 picture header */
284 put_header(s, PICTURE_START_CODE);
285 /* temporal reference */
286 put_bits(&s->pb, 10, pict_num & 0x3ff);
288 put_bits(&s->pb, 3, P_TYPE);
289 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
291 put_bits(&s->pb, 1, 1); /* integer coordinates */
292 put_bits(&s->pb, 3, 1); /* forward_f_code */
294 put_bits(&s->pb, 1, 0); /* extra bit picture */
297 put_header(s, SLICE_MIN_START_CODE);
298 put_bits(&s->pb, 5, 1); /* quantizer scale */
299 put_bits(&s->pb, 1, 0); /* slice extra information */
301 encode_mb_skip_run(s, 0);
303 /* empty macroblock */
304 put_bits(&s->pb, 3, 1); /* motion only */
306 /* zero motion x & y */
307 put_bits(&s->pb, 1, 1);
308 put_bits(&s->pb, 1, 1);
310 /* output a number of empty slice */
311 encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
313 /* empty macroblock */
314 put_bits(&s->pb, 3, 1); /* motion only */
316 /* zero motion x & y */
317 put_bits(&s->pb, 1, 1);
318 put_bits(&s->pb, 1, 1);
322 static void common_init(MpegEncContext *s)
325 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
328 void ff_mpeg1_clean_buffers(MpegEncContext *s){
329 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
330 s->last_dc[1] = s->last_dc[0];
331 s->last_dc[2] = s->last_dc[0];
332 memset(s->last_mv, 0, sizeof(s->last_mv));
335 #ifdef CONFIG_ENCODERS
337 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
338 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
339 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
340 put_bits(&s->pb, 1, 0); /* slice extra information */
343 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
345 mpeg1_encode_sequence_header(s);
347 /* mpeg1 picture header */
348 put_header(s, PICTURE_START_CODE);
349 /* temporal reference */
351 // RAL: s->picture_number instead of s->fake_picture_number
352 put_bits(&s->pb, 10, (s->picture_number -
353 s->gop_picture_number) & 0x3ff);
354 s->fake_picture_number++;
356 put_bits(&s->pb, 3, s->pict_type);
357 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
359 // RAL: Forward f_code also needed for B frames
360 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
361 put_bits(&s->pb, 1, 0); /* half pel coordinates */
362 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
365 // RAL: Backward f_code necessary for B frames
366 if (s->pict_type == B_TYPE) {
367 put_bits(&s->pb, 1, 0); /* half pel coordinates */
368 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
371 put_bits(&s->pb, 1, 0); /* extra bit picture */
374 ff_mpeg1_encode_slice_header(s);
377 void mpeg1_encode_mb(MpegEncContext *s,
378 DCTELEM block[6][64],
379 int motion_x, int motion_y)
382 const int mb_x = s->mb_x;
383 const int mb_y = s->mb_y;
384 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
389 if (s->block_last_index[i] >= 0)
393 if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || mb_y != s->mb_height - 1) &&
394 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
395 (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
396 ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
398 s->qscale -= s->dquant;
404 assert(s->mb_skip_run == 0);
405 encode_mb_skip_run(s, s->mb_x);
407 encode_mb_skip_run(s, s->mb_skip_run);
410 if (s->pict_type == I_TYPE) {
411 if(s->dquant && cbp){
412 put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
413 put_bits(&s->pb, 5, s->qscale);
415 put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
416 s->qscale -= s->dquant;
418 s->misc_bits+= get_bits_diff(s);
420 } else if (s->mb_intra) {
421 if(s->dquant && cbp){
422 put_bits(&s->pb, 6, 0x01);
423 put_bits(&s->pb, 5, s->qscale);
425 put_bits(&s->pb, 5, 0x03);
426 s->qscale -= s->dquant;
428 s->misc_bits+= get_bits_diff(s);
430 s->last_mv[0][0][0] =
431 s->last_mv[0][0][1] = 0;
432 } else if (s->pict_type == P_TYPE) {
434 if (motion_x == 0 && motion_y == 0) {
436 put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
437 put_bits(&s->pb, 5, s->qscale);
439 put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
441 s->misc_bits+= get_bits_diff(s);
442 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
445 put_bits(&s->pb, 5, 2); /* motion + cbp */
446 put_bits(&s->pb, 5, s->qscale);
448 put_bits(&s->pb, 1, 1); /* motion + cbp */
450 s->misc_bits+= get_bits_diff(s);
451 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
452 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
453 s->mv_bits+= get_bits_diff(s);
454 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
457 put_bits(&s->pb, 3, 1); /* motion only */
458 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
459 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
460 s->qscale -= s->dquant;
461 s->mv_bits+= get_bits_diff(s);
465 { // RAL: All the following bloc added for B frames:
467 { // With coded bloc pattern
468 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
469 { // Bi-directional motion
472 put_bits(&s->pb, 5, 2);
473 put_bits(&s->pb, 5, s->qscale);
475 else // Without QScale
476 put_bits(&s->pb, 2, 3);
477 s->misc_bits += get_bits_diff(s);
478 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
479 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
480 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
481 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
484 s->mv_bits += get_bits_diff(s);
485 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
487 else if (s->mv_dir == MV_DIR_BACKWARD)
491 put_bits(&s->pb, 6, 2);
492 put_bits(&s->pb, 5, s->qscale);
494 else // Without QScale
495 put_bits(&s->pb, 3, 3);
496 s->misc_bits += get_bits_diff(s);
497 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
498 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
500 s->mv_bits += get_bits_diff(s);
501 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
503 else if (s->mv_dir == MV_DIR_FORWARD)
507 put_bits(&s->pb, 6, 3);
508 put_bits(&s->pb, 5, s->qscale);
510 else // Without QScale
511 put_bits(&s->pb, 4, 3);
512 s->misc_bits += get_bits_diff(s);
513 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
514 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
516 s->mv_bits += get_bits_diff(s);
517 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
521 { // No coded bloc pattern
522 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
523 { // Bi-directional motion
524 put_bits(&s->pb, 2, 2); /* backward & forward motion */
525 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
526 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
527 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
528 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
532 else if (s->mv_dir == MV_DIR_BACKWARD)
534 put_bits(&s->pb, 3, 2); /* backward motion only */
535 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
536 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
539 else if (s->mv_dir == MV_DIR_FORWARD)
541 put_bits(&s->pb, 4, 2); /* forward motion only */
542 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
543 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
546 s->qscale -= s->dquant;
547 s->mv_bits += get_bits_diff(s);
549 // End of bloc from RAL
552 if (cbp & (1 << (5 - i))) {
553 mpeg1_encode_block(s, block[i], i);
558 s->i_tex_bits+= get_bits_diff(s);
560 s->p_tex_bits+= get_bits_diff(s);
564 if (s->mv_dir & MV_DIR_FORWARD)
566 s->last_mv[0][0][0]= s->mv[0][0][0];
567 s->last_mv[0][0][1]= s->mv[0][0][1];
569 if (s->mv_dir & MV_DIR_BACKWARD)
571 s->last_mv[1][0][0]= s->mv[1][0][0];
572 s->last_mv[1][0][1]= s->mv[1][0][1];
576 // RAL: Parameter added: f_or_b_code
577 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
579 int code, bit_size, l, m, bits, range, sign;
585 mbMotionVectorTable[0][1],
586 mbMotionVectorTable[0][0]);
588 bit_size = f_or_b_code - 1;
589 range = 1 << bit_size;
590 /* modulo encoding */
595 } else if (val >= l) {
601 code = (val >> bit_size) + 1;
602 bits = val & (range - 1);
607 code = (val >> bit_size) + 1;
608 bits = val & (range - 1);
612 assert(code > 0 && code <= 16);
615 mbMotionVectorTable[code][1],
616 mbMotionVectorTable[code][0]);
618 put_bits(&s->pb, 1, sign);
620 put_bits(&s->pb, bit_size, bits);
625 void ff_mpeg1_encode_init(MpegEncContext *s)
641 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
642 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
645 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
647 /* build unified dc encoding tables */
648 for(i=-255; i<256; i++)
656 index = vlc_dc_table[adiff];
658 bits= vlc_dc_lum_bits[index] + index;
659 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
660 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
662 bits= vlc_dc_chroma_bits[index] + index;
663 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
664 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
667 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
669 for(f_code=1; f_code<=MAX_FCODE; f_code++){
670 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
673 if(mv==0) len= mbMotionVectorTable[0][1];
675 int val, bit_size, range, code;
677 bit_size = s->f_code - 1;
678 range = 1 << bit_size;
684 code = (val >> bit_size) + 1;
686 len= mbMotionVectorTable[code][1] + 1 + bit_size;
688 len= mbMotionVectorTable[16][1] + 2 + bit_size;
692 mv_penalty[f_code][mv+MAX_MV]= len;
697 for(f_code=MAX_FCODE; f_code>0; f_code--){
698 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
699 fcode_tab[mv+MAX_MV]= f_code;
703 s->me.mv_penalty= mv_penalty;
704 s->fcode_tab= fcode_tab;
707 s->intra_ac_vlc_length=
708 s->inter_ac_vlc_length= uni_mpeg1_ac_vlc_len;
711 static inline void encode_dc(MpegEncContext *s, int diff, int component)
713 if (component == 0) {
716 mpeg1_lum_dc_uni[diff+255]&0xFF,
717 mpeg1_lum_dc_uni[diff+255]>>8);
721 mpeg1_chr_dc_uni[diff+255]&0xFF,
722 mpeg1_chr_dc_uni[diff+255]>>8);
726 static void mpeg1_encode_block(MpegEncContext *s,
730 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
732 // RLTable *rl = &rl_mpeg1;
734 last_index = s->block_last_index[n];
738 component = (n <= 3 ? 0 : n - 4 + 1);
739 dc = block[0]; /* overflow is impossible */
740 diff = dc - s->last_dc[component];
741 encode_dc(s, diff, component);
742 s->last_dc[component] = dc;
745 /* encode the first coefficient : needs to be done here because
746 it is handled slightly differently */
748 if (abs(level) == 1) {
749 code = ((uint32_t)level >> 31); /* the sign bit */
750 put_bits(&s->pb, 2, code | 0x02);
759 /* now quantify & encode AC coefs */
760 last_non_zero = i - 1;
762 for(;i<=last_index;i++) {
763 j = s->intra_scantable.permutated[i];
768 dprintf("level[%d]=%d\n", i, level);
770 /* encode using VLC */
772 run = i - last_non_zero - 1;
775 MASK_ABS(sign, alevel)
778 // code = get_rl_index(rl, 0, run, alevel);
779 if (alevel <= mpeg1_max_level[0][run]){
780 code= mpeg1_index_run[0][run] + alevel - 1;
781 /* store the vlc & sign at once */
782 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
784 /* escape seems to be pretty rare <5% so i dont optimize it */
785 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
786 /* escape: only clip in this case */
787 put_bits(&s->pb, 6, run);
789 put_bits(&s->pb, 8, level & 0xff);
792 put_bits(&s->pb, 16, 0x8001 + level + 255);
794 put_bits(&s->pb, 16, level & 0xffff);
802 put_bits(&s->pb, 2, 0x2);
804 #endif //CONFIG_ENCODERS
806 /******************************************/
809 static VLC dc_lum_vlc;
810 static VLC dc_chroma_vlc;
812 static VLC mbincr_vlc;
813 static VLC mb_ptype_vlc;
814 static VLC mb_btype_vlc;
815 static VLC mb_pat_vlc;
817 static void init_vlcs(MpegEncContext *s)
824 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
825 vlc_dc_lum_bits, 1, 1,
826 vlc_dc_lum_code, 2, 2);
827 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
828 vlc_dc_chroma_bits, 1, 1,
829 vlc_dc_chroma_code, 2, 2);
830 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
831 &mbMotionVectorTable[0][1], 2, 1,
832 &mbMotionVectorTable[0][0], 2, 1);
833 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
834 &mbAddrIncrTable[0][1], 2, 1,
835 &mbAddrIncrTable[0][0], 2, 1);
836 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
837 &mbPatTable[0][1], 2, 1,
838 &mbPatTable[0][0], 2, 1);
840 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
841 &table_mb_ptype[0][1], 2, 1,
842 &table_mb_ptype[0][0], 2, 1);
843 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
844 &table_mb_btype[0][1], 2, 1,
845 &table_mb_btype[0][0], 2, 1);
849 init_2d_vlc_rl(&rl_mpeg1);
850 init_2d_vlc_rl(&rl_mpeg2);
854 static inline int get_dmv(MpegEncContext *s)
856 if(get_bits1(&s->gb))
857 return 1 - (get_bits1(&s->gb) << 1);
862 static inline int get_qscale(MpegEncContext *s)
864 int qscale = get_bits(&s->gb, 5);
866 if (s->q_scale_type) {
867 return non_linear_qscale[qscale];
875 /* motion type (for mpeg2) */
881 static int mpeg_decode_mb(MpegEncContext *s,
882 DCTELEM block[6][64])
884 int i, j, k, cbp, val, mb_type, motion_type;
886 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
888 assert(s->mb_skiped==0);
890 if (s->mb_skip_run-- != 0) {
891 if(s->pict_type == I_TYPE){
892 fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
899 s->block_last_index[i] = -1;
900 s->mv_type = MV_TYPE_16X16;
901 if (s->pict_type == P_TYPE) {
902 /* if P type, zero motion vector is implied */
903 s->mv_dir = MV_DIR_FORWARD;
904 s->mv[0][0][0] = s->mv[0][0][1] = 0;
905 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
906 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
908 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
910 /* if B type, reuse previous vectors and directions */
911 s->mv[0][0][0] = s->last_mv[0][0][0];
912 s->mv[0][0][1] = s->last_mv[0][0][1];
913 s->mv[1][0][0] = s->last_mv[1][0][0];
914 s->mv[1][0][1] = s->last_mv[1][0][1];
916 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
917 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
918 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
920 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
927 switch(s->pict_type) {
930 if (get_bits1(&s->gb) == 0) {
931 if (get_bits1(&s->gb) == 0)
933 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
935 mb_type = MB_TYPE_INTRA;
939 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
941 fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
944 mb_type = ptype2mb_type[ mb_type ];
947 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
949 fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
952 mb_type = btype2mb_type[ mb_type ];
955 dprintf("mb_type=%x\n", mb_type);
956 // motion_type = 0; /* avoid warning */
957 if (IS_INTRA(mb_type)) {
958 /* compute dct type */
959 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
960 !s->frame_pred_frame_dct) {
961 s->interlaced_dct = get_bits1(&s->gb);
964 if (IS_QUANT(mb_type))
965 s->qscale = get_qscale(s);
967 if (s->concealment_motion_vectors) {
968 /* just parse them */
969 if (s->picture_structure != PICT_FRAME)
970 skip_bits1(&s->gb); /* field select */
972 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
973 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
974 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
975 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
977 skip_bits1(&s->gb); /* marker */
979 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
984 if (mpeg2_decode_block_intra(s, block[i], i) < 0)
989 if (mpeg1_decode_block_intra(s, block[i], i) < 0)
994 if (mb_type & MB_TYPE_ZERO_MV){
995 assert(mb_type & MB_TYPE_PAT);
997 /* compute dct type */
998 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
999 !s->frame_pred_frame_dct) {
1000 s->interlaced_dct = get_bits1(&s->gb);
1003 if (IS_QUANT(mb_type))
1004 s->qscale = get_qscale(s);
1006 s->mv_dir = MV_DIR_FORWARD;
1007 s->mv_type = MV_TYPE_16X16;
1008 s->last_mv[0][0][0] = 0;
1009 s->last_mv[0][0][1] = 0;
1010 s->last_mv[0][1][0] = 0;
1011 s->last_mv[0][1][1] = 0;
1015 assert(mb_type & MB_TYPE_L0L1);
1016 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1017 /* get additionnal motion vector type */
1018 if (s->frame_pred_frame_dct)
1019 motion_type = MT_FRAME;
1021 motion_type = get_bits(&s->gb, 2);
1024 /* compute dct type */
1025 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1026 !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1027 s->interlaced_dct = get_bits1(&s->gb);
1030 if (IS_QUANT(mb_type))
1031 s->qscale = get_qscale(s);
1033 /* motion vectors */
1036 if (USES_LIST(mb_type, i)) {
1037 s->mv_dir |= (MV_DIR_FORWARD >> i);
1038 dprintf("motion_type=%d\n", motion_type);
1039 switch(motion_type) {
1040 case MT_FRAME: /* or MT_16X8 */
1041 if (s->picture_structure == PICT_FRAME) {
1043 mb_type |= MB_TYPE_16x16;
1044 s->mv_type = MV_TYPE_16X16;
1045 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1046 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1047 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1048 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1049 /* full_pel: only for mpeg1 */
1050 if (s->full_pel[i]){
1051 s->mv[i][0][0] <<= 1;
1052 s->mv[i][0][1] <<= 1;
1056 mb_type |= MB_TYPE_16x8;
1057 s->mv_type = MV_TYPE_16X8;
1059 s->field_select[i][j] = get_bits1(&s->gb);
1061 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1062 s->last_mv[i][j][k]);
1063 s->last_mv[i][j][k] = val;
1064 s->mv[i][j][k] = val;
1070 s->mv_type = MV_TYPE_FIELD;
1071 if (s->picture_structure == PICT_FRAME) {
1072 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1074 s->field_select[i][j] = get_bits1(&s->gb);
1075 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1076 s->last_mv[i][j][0]);
1077 s->last_mv[i][j][0] = val;
1078 s->mv[i][j][0] = val;
1079 dprintf("fmx=%d\n", val);
1080 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1081 s->last_mv[i][j][1] >> 1);
1082 s->last_mv[i][j][1] = val << 1;
1083 s->mv[i][j][1] = val;
1084 dprintf("fmy=%d\n", val);
1087 mb_type |= MB_TYPE_16x16;
1088 s->field_select[i][0] = get_bits1(&s->gb);
1090 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1091 s->last_mv[i][0][k]);
1092 s->last_mv[i][0][k] = val;
1093 s->last_mv[i][1][k] = val;
1094 s->mv[i][0][k] = val;
1100 int dmx, dmy, mx, my, m;
1102 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1103 s->last_mv[i][0][0]);
1104 s->last_mv[i][0][0] = mx;
1105 s->last_mv[i][1][0] = mx;
1107 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1108 s->last_mv[i][0][1] >> 1);
1110 s->mv_type = MV_TYPE_DMV;
1113 s->last_mv[i][0][1] = my<<1;
1114 s->last_mv[i][1][1] = my<<1;
1116 s->mv[i][0][0] = mx;
1117 s->mv[i][0][1] = my;
1118 s->mv[i][1][0] = mx;//not used
1119 s->mv[i][1][1] = my;//not used
1121 if (s->picture_structure == PICT_FRAME) {
1122 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1124 //m = 1 + 2 * s->top_field_first;
1125 m = s->top_field_first ? 1 : 3;
1127 /* top -> top pred */
1128 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1129 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1131 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1132 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1134 mb_type |= MB_TYPE_16x16;
1136 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1137 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1138 if(s->picture_structure == PICT_TOP_FIELD)
1152 if (IS_PAT(mb_type)) {
1153 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1155 fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1163 if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
1166 s->block_last_index[i] = -1;
1173 if (mpeg1_decode_block_inter(s, block[i], i) < 0)
1176 s->block_last_index[i] = -1;
1183 s->block_last_index[i] = -1;
1187 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1192 /* as h263, but only 17 codes */
1193 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1195 int code, sign, val, l, shift;
1197 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1205 sign = get_bits1(&s->gb);
1209 val = (val - 1) << shift;
1210 val |= get_bits(&s->gb, shift);
1217 /* modulo decoding */
1219 val = ((val + l)&(l*2-1)) - l;
1223 static inline int decode_dc(MpegEncContext *s, int component)
1227 if (component == 0) {
1228 code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1230 code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1233 fprintf(stderr, "invalid dc code at %d %d\n", s->mb_x, s->mb_y);
1239 diff = get_xbits(&s->gb, code);
1244 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1248 int level, dc, diff, i, j, run;
1250 RLTable *rl = &rl_mpeg1;
1251 uint8_t * const scantable= s->intra_scantable.permutated;
1252 const uint16_t *quant_matrix= s->intra_matrix;
1253 const int qscale= s->qscale;
1256 component = (n <= 3 ? 0 : n - 4 + 1);
1257 diff = decode_dc(s, component);
1260 dc = s->last_dc[component];
1262 s->last_dc[component] = dc;
1264 dprintf("dc=%d diff=%d\n", dc, diff);
1267 OPEN_READER(re, &s->gb);
1268 /* now quantify & encode AC coefs */
1270 UPDATE_CACHE(re, &s->gb);
1271 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1275 } else if(level != 0) {
1278 level= (level*qscale*quant_matrix[j])>>3;
1280 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1281 LAST_SKIP_BITS(re, &s->gb, 1);
1284 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1285 UPDATE_CACHE(re, &s->gb);
1286 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1287 if (level == -128) {
1288 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1289 } else if (level == 0) {
1290 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1296 level= (level*qscale*quant_matrix[j])>>3;
1300 level= (level*qscale*quant_matrix[j])>>3;
1305 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1311 CLOSE_READER(re, &s->gb);
1313 s->block_last_index[n] = i;
1317 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1321 int level, i, j, run;
1322 RLTable *rl = &rl_mpeg1;
1323 uint8_t * const scantable= s->intra_scantable.permutated;
1324 const uint16_t *quant_matrix= s->inter_matrix;
1325 const int qscale= s->qscale;
1329 OPEN_READER(re, &s->gb);
1331 /* special case for the first coef. no need to add a second vlc table */
1332 UPDATE_CACHE(re, &s->gb);
1333 v= SHOW_UBITS(re, &s->gb, 2);
1335 LAST_SKIP_BITS(re, &s->gb, 2);
1336 level= (3*qscale*quant_matrix[0])>>4;
1344 /* now quantify & encode AC coefs */
1346 UPDATE_CACHE(re, &s->gb);
1347 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1351 } else if(level != 0) {
1354 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1356 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1357 LAST_SKIP_BITS(re, &s->gb, 1);
1360 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1361 UPDATE_CACHE(re, &s->gb);
1362 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1363 if (level == -128) {
1364 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1365 } else if (level == 0) {
1366 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1372 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1376 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1381 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1387 CLOSE_READER(re, &s->gb);
1389 s->block_last_index[n] = i;
1393 /* Also does unquantization here, since I will never support mpeg2
1395 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1399 int level, i, j, run;
1400 RLTable *rl = &rl_mpeg1;
1401 uint8_t * const scantable= s->intra_scantable.permutated;
1402 const uint16_t *quant_matrix;
1403 const int qscale= s->qscale;
1410 OPEN_READER(re, &s->gb);
1413 quant_matrix = s->inter_matrix;
1415 quant_matrix = s->chroma_inter_matrix;
1417 /* special case for the first coef. no need to add a second vlc table */
1418 UPDATE_CACHE(re, &s->gb);
1419 v= SHOW_UBITS(re, &s->gb, 2);
1421 LAST_SKIP_BITS(re, &s->gb, 2);
1422 level= (3*qscale*quant_matrix[0])>>5;
1430 /* now quantify & encode AC coefs */
1432 UPDATE_CACHE(re, &s->gb);
1433 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1437 } else if(level != 0) {
1440 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1441 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1442 LAST_SKIP_BITS(re, &s->gb, 1);
1445 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1446 UPDATE_CACHE(re, &s->gb);
1447 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1452 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1455 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1459 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1466 CLOSE_READER(re, &s->gb);
1468 block[63] ^= (mismatch & 1);
1470 s->block_last_index[n] = i;
1474 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1478 int level, dc, diff, i, j, run;
1481 uint8_t * const scantable= s->intra_scantable.permutated;
1482 const uint16_t *quant_matrix;
1483 const int qscale= s->qscale;
1488 quant_matrix = s->intra_matrix;
1491 quant_matrix = s->chroma_intra_matrix;
1494 diff = decode_dc(s, component);
1497 dc = s->last_dc[component];
1499 s->last_dc[component] = dc;
1500 block[0] = dc << (3 - s->intra_dc_precision);
1501 dprintf("dc=%d\n", block[0]);
1502 mismatch = block[0] ^ 1;
1504 if (s->intra_vlc_format)
1510 OPEN_READER(re, &s->gb);
1511 /* now quantify & encode AC coefs */
1513 UPDATE_CACHE(re, &s->gb);
1514 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1518 } else if(level != 0) {
1521 level= (level*qscale*quant_matrix[j])>>4;
1522 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1523 LAST_SKIP_BITS(re, &s->gb, 1);
1526 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1527 UPDATE_CACHE(re, &s->gb);
1528 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1532 level= (-level*qscale*quant_matrix[j])>>4;
1535 level= (level*qscale*quant_matrix[j])>>4;
1539 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1546 CLOSE_READER(re, &s->gb);
1548 block[63]^= mismatch&1;
1550 s->block_last_index[n] = i;
1554 typedef struct Mpeg1Context {
1555 MpegEncContext mpeg_enc_ctx;
1556 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1557 int repeat_field; /* true if we must repeat the field */
1560 static int mpeg_decode_init(AVCodecContext *avctx)
1562 Mpeg1Context *s = avctx->priv_data;
1564 s->mpeg_enc_ctx.flags= avctx->flags;
1565 common_init(&s->mpeg_enc_ctx);
1566 init_vlcs(&s->mpeg_enc_ctx);
1568 s->mpeg_enc_ctx_allocated = 0;
1569 s->mpeg_enc_ctx.picture_number = 0;
1570 s->repeat_field = 0;
1571 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1575 /* return the 8 bit start code value and update the search
1576 state. Return -1 if no start code found */
1577 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1580 unsigned int state=0xFFFFFFFF, v;
1583 buf_ptr = *pbuf_ptr;
1584 while (buf_ptr < buf_end) {
1586 if (state == 0x000001) {
1587 state = ((state << 8) | v) & 0xffffff;
1591 state = ((state << 8) | v) & 0xffffff;
1595 *pbuf_ptr = buf_ptr;
1599 static int mpeg1_decode_picture(AVCodecContext *avctx,
1600 uint8_t *buf, int buf_size)
1602 Mpeg1Context *s1 = avctx->priv_data;
1603 MpegEncContext *s = &s1->mpeg_enc_ctx;
1606 init_get_bits(&s->gb, buf, buf_size*8);
1608 ref = get_bits(&s->gb, 10); /* temporal ref */
1609 s->pict_type = get_bits(&s->gb, 3);
1610 dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1612 skip_bits(&s->gb, 16);
1613 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1614 s->full_pel[0] = get_bits1(&s->gb);
1615 f_code = get_bits(&s->gb, 3);
1618 s->mpeg_f_code[0][0] = f_code;
1619 s->mpeg_f_code[0][1] = f_code;
1621 if (s->pict_type == B_TYPE) {
1622 s->full_pel[1] = get_bits1(&s->gb);
1623 f_code = get_bits(&s->gb, 3);
1626 s->mpeg_f_code[1][0] = f_code;
1627 s->mpeg_f_code[1][1] = f_code;
1629 s->current_picture.pict_type= s->pict_type;
1630 s->current_picture.key_frame= s->pict_type == I_TYPE;
1638 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1640 int horiz_size_ext, vert_size_ext;
1641 int bit_rate_ext, vbv_buf_ext;
1642 int frame_rate_ext_n, frame_rate_ext_d;
1645 skip_bits(&s->gb, 8); /* profil and level */
1646 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1647 skip_bits(&s->gb, 2); /* chroma_format */
1648 horiz_size_ext = get_bits(&s->gb, 2);
1649 vert_size_ext = get_bits(&s->gb, 2);
1650 s->width |= (horiz_size_ext << 12);
1651 s->height |= (vert_size_ext << 12);
1652 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1653 s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1654 skip_bits1(&s->gb); /* marker */
1655 vbv_buf_ext = get_bits(&s->gb, 8);
1657 s->low_delay = get_bits1(&s->gb);
1658 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1660 frame_rate_ext_n = get_bits(&s->gb, 2);
1661 frame_rate_ext_d = get_bits(&s->gb, 5);
1663 &s->avctx->frame_rate,
1664 &s->avctx->frame_rate_base,
1665 frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1666 MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1669 dprintf("sequence extension\n");
1671 s->avctx->sub_id = 2; /* indicates mpeg2 found */
1673 aspect= mpeg2_aspect[s->aspect_ratio_info];
1674 if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
1675 else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
1678 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1682 dprintf("matrix extension\n");
1684 if (get_bits1(&s->gb)) {
1686 v = get_bits(&s->gb, 8);
1687 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1688 s->intra_matrix[j] = v;
1689 s->chroma_intra_matrix[j] = v;
1692 if (get_bits1(&s->gb)) {
1694 v = get_bits(&s->gb, 8);
1695 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1696 s->inter_matrix[j] = v;
1697 s->chroma_inter_matrix[j] = v;
1700 if (get_bits1(&s->gb)) {
1702 v = get_bits(&s->gb, 8);
1703 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1704 s->chroma_intra_matrix[j] = v;
1707 if (get_bits1(&s->gb)) {
1709 v = get_bits(&s->gb, 8);
1710 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1711 s->chroma_inter_matrix[j] = v;
1716 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1718 s->full_pel[0] = s->full_pel[1] = 0;
1719 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1720 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1721 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1722 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1723 s->intra_dc_precision = get_bits(&s->gb, 2);
1724 s->picture_structure = get_bits(&s->gb, 2);
1725 s->top_field_first = get_bits1(&s->gb);
1726 s->frame_pred_frame_dct = get_bits1(&s->gb);
1727 s->concealment_motion_vectors = get_bits1(&s->gb);
1728 s->q_scale_type = get_bits1(&s->gb);
1729 s->intra_vlc_format = get_bits1(&s->gb);
1730 s->alternate_scan = get_bits1(&s->gb);
1731 s->repeat_first_field = get_bits1(&s->gb);
1732 s->chroma_420_type = get_bits1(&s->gb);
1733 s->progressive_frame = get_bits1(&s->gb);
1735 if(s->picture_structure == PICT_FRAME)
1738 s->first_field ^= 1;
1739 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1742 if(s->alternate_scan){
1743 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1744 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1745 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1746 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1748 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1749 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1750 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1751 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1754 /* composite display not parsed */
1755 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1756 dprintf("picture_structure=%d\n", s->picture_structure);
1757 dprintf("top field first=%d\n", s->top_field_first);
1758 dprintf("repeat first field=%d\n", s->repeat_first_field);
1759 dprintf("conceal=%d\n", s->concealment_motion_vectors);
1760 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1761 dprintf("alternate_scan=%d\n", s->alternate_scan);
1762 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1763 dprintf("progressive_frame=%d\n", s->progressive_frame);
1766 static void mpeg_decode_extension(AVCodecContext *avctx,
1767 uint8_t *buf, int buf_size)
1769 Mpeg1Context *s1 = avctx->priv_data;
1770 MpegEncContext *s = &s1->mpeg_enc_ctx;
1773 init_get_bits(&s->gb, buf, buf_size*8);
1775 ext_type = get_bits(&s->gb, 4);
1779 mpeg_decode_sequence_extension(s);
1782 /* quant matrix extension */
1783 mpeg_decode_quant_matrix_extension(s);
1786 /* picture extension */
1787 mpeg_decode_picture_coding_extension(s);
1792 #define DECODE_SLICE_FATAL_ERROR -2
1793 #define DECODE_SLICE_ERROR -1
1794 #define DECODE_SLICE_OK 0
1798 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1799 * DECODE_SLICE_ERROR if the slice is damaged<br>
1800 * DECODE_SLICE_OK if this slice is ok<br>
1802 static int mpeg_decode_slice(AVCodecContext *avctx,
1805 uint8_t **buf, int buf_size)
1807 Mpeg1Context *s1 = avctx->priv_data;
1808 MpegEncContext *s = &s1->mpeg_enc_ctx;
1810 const int field_pic= s->picture_structure != PICT_FRAME;
1812 s->resync_mb_x= s->mb_x =
1813 s->resync_mb_y= s->mb_y = -1;
1815 start_code = (start_code - 1) & 0xff;
1816 if (start_code >= s->mb_height){
1817 fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
1821 ff_mpeg1_clean_buffers(s);
1822 s->interlaced_dct = 0;
1824 /* start frame decoding */
1825 if (s->first_slice) {
1826 if(s->first_field || s->picture_structure==PICT_FRAME){
1827 if(MPV_frame_start(s, avctx) < 0)
1828 return DECODE_SLICE_FATAL_ERROR;
1830 ff_er_frame_start(s);
1832 /* first check if we must repeat the frame */
1833 s->current_picture.repeat_pict = 0;
1835 if (s->repeat_first_field) {
1836 if (s->progressive_sequence) {
1837 if (s->top_field_first)
1838 s->current_picture.repeat_pict = 4;
1840 s->current_picture.repeat_pict = 2;
1841 } else if (s->progressive_frame) {
1842 s->current_picture.repeat_pict = 1;
1845 // printf("%d \n", s->current_picture.repeat_pict);
1847 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1848 printf("qp:%d fc:%2d%2d%2d%2d %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1849 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],
1850 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1851 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1852 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1853 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1855 }else{ //second field
1858 if(!s->current_picture_ptr){
1859 fprintf(stderr, "first field missing\n");
1864 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1865 if(s->picture_structure == PICT_BOTTOM_FIELD){
1866 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1873 init_get_bits(&s->gb, *buf, buf_size*8);
1875 s->qscale = get_qscale(s);
1877 fprintf(stderr, "qscale == 0\n");
1881 /* extra slice info */
1882 while (get_bits1(&s->gb) != 0) {
1883 skip_bits(&s->gb, 8);
1889 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1891 fprintf(stderr, "first mb_incr damaged\n");
1898 /* otherwise, stuffing, nothing to do */
1905 s->resync_mb_x= s->mb_x;
1906 s->resync_mb_y= s->mb_y = start_code;
1910 s->dsp.clear_blocks(s->block[0]);
1912 ret = mpeg_decode_mb(s, s->block);
1914 dprintf("ret=%d\n", ret);
1918 if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
1919 const int wrap = s->block_wrap[0];
1920 const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
1921 int motion_x, motion_y;
1924 motion_x = motion_y = 0;
1925 }else if (s->mv_type == MV_TYPE_16X16) {
1926 motion_x = s->mv[0][0][0];
1927 motion_y = s->mv[0][0][1];
1928 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
1929 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
1930 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
1931 motion_x = (motion_x>>1) | (motion_x&1);
1933 s->motion_val[xy][0] = motion_x;
1934 s->motion_val[xy][1] = motion_y;
1935 s->motion_val[xy + 1][0] = motion_x;
1936 s->motion_val[xy + 1][1] = motion_y;
1937 s->motion_val[xy + wrap][0] = motion_x;
1938 s->motion_val[xy + wrap][1] = motion_y;
1939 s->motion_val[xy + 1 + wrap][0] = motion_x;
1940 s->motion_val[xy + 1 + wrap][1] = motion_y;
1943 MPV_decode_mb(s, s->block);
1945 if (++s->mb_x >= s->mb_width) {
1946 if(s->picture_structure==PICT_FRAME){
1947 ff_draw_horiz_band(s, 16*s->mb_y, 16);
1949 if(!s->first_field){
1950 ff_draw_horiz_band(s, 32*s->mb_y, 32);
1957 if(s->mb_y<<field_pic >= s->mb_height){
1958 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1960 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
1961 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1962 fprintf(stderr, "end missmatch left=%d\n", left);
1969 /* skip mb handling */
1970 if (s->mb_skip_run == -1) {
1971 /* read again increment */
1974 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1976 fprintf(stderr, "mb incr damaged\n");
1981 s->mb_skip_run += 33;
1982 }else if(code == 35){
1983 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1984 fprintf(stderr, "slice missmatch\n");
1987 goto eos; /* end of slice */
1989 /* otherwise, stuffing, nothing to do */
1991 s->mb_skip_run += code;
1997 eos: // end of slice
1998 *buf += get_bits_count(&s->gb)/8 - 1;
1999 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2004 * handles slice ends.
2005 * @return 1 if it seems to be the last slice of
2007 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2009 Mpeg1Context *s1 = avctx->priv_data;
2010 MpegEncContext *s = &s1->mpeg_enc_ctx;
2012 if (!s1->mpeg_enc_ctx_allocated)
2015 /* end of slice reached */
2016 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2020 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2022 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2028 if (s->pict_type == B_TYPE || s->low_delay) {
2029 *pict= *(AVFrame*)s->current_picture_ptr;
2030 ff_print_debug_info(s, s->current_picture_ptr);
2032 s->picture_number++;
2033 /* latency of 1 frame for I and P frames */
2034 /* XXX: use another variable than picture_number */
2035 if (s->last_picture_ptr != NULL) {
2036 *pict= *(AVFrame*)s->last_picture_ptr;
2037 ff_print_debug_info(s, s->last_picture_ptr);
2046 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2047 uint8_t *buf, int buf_size)
2049 Mpeg1Context *s1 = avctx->priv_data;
2050 MpegEncContext *s = &s1->mpeg_enc_ctx;
2051 int width, height, i, v, j;
2054 init_get_bits(&s->gb, buf, buf_size*8);
2056 width = get_bits(&s->gb, 12);
2057 height = get_bits(&s->gb, 12);
2058 s->aspect_ratio_info= get_bits(&s->gb, 4);
2060 aspect= mpeg1_aspect[s->aspect_ratio_info];
2061 if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
2064 s->frame_rate_index = get_bits(&s->gb, 4);
2065 if (s->frame_rate_index == 0)
2067 s->bit_rate = get_bits(&s->gb, 18) * 400;
2068 if (get_bits1(&s->gb) == 0) /* marker */
2070 if (width <= 0 || height <= 0 ||
2071 (width % 2) != 0 || (height % 2) != 0)
2073 if (width != s->width ||
2074 height != s->height) {
2075 /* start new mpeg1 context decoding */
2076 s->out_format = FMT_MPEG1;
2077 if (s1->mpeg_enc_ctx_allocated) {
2082 avctx->has_b_frames= 1;
2084 avctx->width = width;
2085 avctx->height = height;
2088 &avctx->frame_rate_base,
2089 frame_rate_tab[s->frame_rate_index],
2090 MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2093 avctx->bit_rate = s->bit_rate;
2095 if (MPV_common_init(s) < 0)
2097 s1->mpeg_enc_ctx_allocated = 1;
2100 skip_bits(&s->gb, 10); /* vbv_buffer_size */
2101 skip_bits(&s->gb, 1);
2104 if (get_bits1(&s->gb)) {
2106 v = get_bits(&s->gb, 8);
2107 j = s->intra_scantable.permutated[i];
2108 s->intra_matrix[j] = v;
2109 s->chroma_intra_matrix[j] = v;
2112 dprintf("intra matrix present\n");
2114 dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2119 int j= s->dsp.idct_permutation[i];
2120 v = ff_mpeg1_default_intra_matrix[i];
2121 s->intra_matrix[j] = v;
2122 s->chroma_intra_matrix[j] = v;
2125 if (get_bits1(&s->gb)) {
2127 v = get_bits(&s->gb, 8);
2128 j = s->intra_scantable.permutated[i];
2129 s->inter_matrix[j] = v;
2130 s->chroma_inter_matrix[j] = v;
2133 dprintf("non intra matrix present\n");
2135 dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2140 int j= s->dsp.idct_permutation[i];
2141 v = ff_mpeg1_default_non_intra_matrix[i];
2142 s->inter_matrix[j] = v;
2143 s->chroma_inter_matrix[j] = v;
2147 /* we set mpeg2 parameters so that it emulates mpeg1 */
2148 s->progressive_sequence = 1;
2149 s->progressive_frame = 1;
2150 s->picture_structure = PICT_FRAME;
2151 s->frame_pred_frame_dct = 1;
2153 avctx->sub_id = 1; /* indicates mpeg1 */
2157 static void mpeg_decode_user_data(AVCodecContext *avctx,
2158 const uint8_t *buf, int buf_size)
2165 /* we parse the DTG active format information */
2167 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2181 avctx->dtg_active_format = p[0] & 0x0f;
2187 * finds the end of the current frame in the bitstream.
2188 * @return the position of the first byte of the next frame, or -1
2190 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2191 ParseContext *pc= &s->parse_context;
2198 if(!pc->frame_start_found){
2199 for(i=0; i<buf_size; i++){
2200 state= (state<<8) | buf[i];
2201 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2203 pc->frame_start_found=1;
2209 if(pc->frame_start_found){
2210 for(; i<buf_size; i++){
2211 state= (state<<8) | buf[i];
2212 if((state&0xFFFFFF00) == 0x100){
2213 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2214 pc->frame_start_found=0;
2222 return END_NOT_FOUND;
2225 /* handle buffering and image synchronisation */
2226 static int mpeg_decode_frame(AVCodecContext *avctx,
2227 void *data, int *data_size,
2228 uint8_t *buf, int buf_size)
2230 Mpeg1Context *s = avctx->priv_data;
2231 uint8_t *buf_end, *buf_ptr;
2232 int ret, start_code, input_size;
2233 AVFrame *picture = data;
2234 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2235 dprintf("fill_buffer\n");
2239 /* special case for last picture */
2240 if (buf_size == 0) {
2241 if (s2->picture_number > 0) {
2242 *picture= *(AVFrame*)&s2->next_picture;
2244 *data_size = sizeof(AVFrame);
2249 if(s2->flags&CODEC_FLAG_TRUNCATED){
2250 int next= mpeg1_find_frame_end(s2, buf, buf_size);
2252 if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2257 buf_end = buf + buf_size;
2260 if (s->repeat_field % 2 == 1) {
2262 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2263 // s2->picture_number, s->repeat_field);
2264 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2265 *data_size = sizeof(AVPicture);
2271 /* find start next code */
2272 start_code = find_start_code(&buf_ptr, buf_end);
2273 if (start_code < 0){
2274 if (slice_end(avctx, picture)) {
2275 if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2276 *data_size = sizeof(AVPicture);
2278 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2281 input_size = buf_end - buf_ptr;
2283 if(avctx->debug & FF_DEBUG_STARTCODE){
2284 printf("%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2287 /* prepare data for next start code */
2288 switch(start_code) {
2289 case SEQ_START_CODE:
2290 mpeg1_decode_sequence(avctx, buf_ptr,
2294 case PICTURE_START_CODE:
2295 /* we have a complete image : we try to decompress it */
2296 mpeg1_decode_picture(avctx,
2297 buf_ptr, input_size);
2299 case EXT_START_CODE:
2300 mpeg_decode_extension(avctx,
2301 buf_ptr, input_size);
2303 case USER_START_CODE:
2304 mpeg_decode_user_data(avctx,
2305 buf_ptr, input_size);
2307 case GOP_START_CODE:
2311 if (start_code >= SLICE_MIN_START_CODE &&
2312 start_code <= SLICE_MAX_START_CODE) {
2314 /* skip b frames if we dont have reference frames */
2315 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2316 /* skip b frames if we are in a hurry */
2317 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2318 /* skip everything if we are in a hurry>=5 */
2319 if(avctx->hurry_up>=5) break;
2321 if (!s->mpeg_enc_ctx_allocated) break;
2323 ret = mpeg_decode_slice(avctx, picture,
2324 start_code, &buf_ptr, input_size);
2328 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2329 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);
2330 if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2332 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);
2340 static int mpeg_decode_end(AVCodecContext *avctx)
2342 Mpeg1Context *s = avctx->priv_data;
2344 if (s->mpeg_enc_ctx_allocated)
2345 MPV_common_end(&s->mpeg_enc_ctx);
2349 AVCodec mpeg_decoder = {
2352 CODEC_ID_MPEG1VIDEO,
2353 sizeof(Mpeg1Context),
2358 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,