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);
71 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
72 extern int XVMC_field_end(MpegEncContext *s);
75 #ifdef CONFIG_ENCODERS
76 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
77 static uint8_t fcode_tab[MAX_MV*2+1];
79 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
80 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
82 /* simple include everything table for dc, first byte is bits number next 3 are code*/
83 static uint32_t mpeg1_lum_dc_uni[512];
84 static uint32_t mpeg1_chr_dc_uni[512];
86 static uint8_t mpeg1_index_run[2][64];
87 static int8_t mpeg1_max_level[2][64];
90 static void init_2d_vlc_rl(RLTable *rl)
94 init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
95 &rl->table_vlc[0][1], 4, 2,
96 &rl->table_vlc[0][0], 4, 2);
99 rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
100 for(i=0; i<rl->vlc.table_size; i++){
101 int code= rl->vlc.table[i][0];
102 int len = rl->vlc.table[i][1];
105 if(len==0){ // illegal code
108 }else if(len<0){ //more bits needed
112 if(code==rl->n){ //esc
115 }else if(code==rl->n+1){ //eob
119 run= rl->table_run [code] + 1;
120 level= rl->table_level[code];
123 rl->rl_vlc[0][i].len= len;
124 rl->rl_vlc[0][i].level= level;
125 rl->rl_vlc[0][i].run= run;
129 #ifdef CONFIG_ENCODERS
130 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
133 for(i=0; i<128; i++){
136 for(run=0; run<64; run++){
139 int alevel= ABS(level);
140 int sign= (level>>31)&1;
142 if (alevel > rl->max_level[0][run])
145 code= rl->index_run[0][run] + alevel - 1;
147 if (code < 111 /* rl->n */) {
148 /* store the vlc & sign at once */
149 len= mpeg1_vlc[code][1]+1;
150 bits= (mpeg1_vlc[code][0]<<1) + sign;
152 len= mpeg1_vlc[111/*rl->n*/][1]+6;
153 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
163 bits|= 0x8001 + level + 255;
165 bits|= level & 0xffff;
170 uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
171 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
176 static void put_header(MpegEncContext *s, int header)
178 align_put_bits(&s->pb);
179 put_bits(&s->pb, 16, header>>16);
180 put_bits(&s->pb, 16, header&0xFFFF);
183 /* put sequence header if needed */
184 static void mpeg1_encode_sequence_header(MpegEncContext *s)
186 unsigned int vbv_buffer_size;
190 float best_aspect_error= 1E10;
191 float aspect_ratio= s->avctx->aspect_ratio;
193 if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
195 if (s->current_picture.key_frame) {
196 /* mpeg1 header repeated every gop */
197 put_header(s, SEQ_START_CODE);
199 /* search closest frame rate */
202 s->frame_rate_index = 0;
205 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
207 d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
210 s->frame_rate_index = i;
215 put_bits(&s->pb, 12, s->width);
216 put_bits(&s->pb, 12, s->height);
219 float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
222 if(error < best_aspect_error){
223 best_aspect_error= error;
224 s->aspect_ratio_info= i;
228 put_bits(&s->pb, 4, s->aspect_ratio_info);
229 put_bits(&s->pb, 4, s->frame_rate_index);
230 v = (s->bit_rate + 399) / 400;
233 put_bits(&s->pb, 18, v);
234 put_bits(&s->pb, 1, 1); /* marker */
236 if(s->avctx->rc_buffer_size)
237 vbv_buffer_size = s->avctx->rc_buffer_size;
239 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
240 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
241 put_bits(&s->pb, 10, (vbv_buffer_size + 16383) / 16384);
242 put_bits(&s->pb, 1, 1); /* constrained parameter flag */
243 put_bits(&s->pb, 1, 0); /* no custom intra matrix */
244 put_bits(&s->pb, 1, 0); /* no custom non intra matrix */
246 put_header(s, GOP_START_CODE);
247 put_bits(&s->pb, 1, 0); /* do drop frame */
248 /* time code : we must convert from the real frame rate to a
249 fake mpeg frame rate in case of low frame rate */
250 fps = frame_rate_tab[s->frame_rate_index];
251 time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
252 s->gop_picture_number = s->fake_picture_number;
253 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
254 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
255 put_bits(&s->pb, 1, 1);
256 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
257 put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
258 put_bits(&s->pb, 1, 1); /* closed gop */
259 put_bits(&s->pb, 1, 0); /* broken link */
262 if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
263 /* insert empty P pictures to slow down to the desired
264 frame rate. Each fake pictures takes about 20 bytes */
265 fps = frame_rate_tab[s->frame_rate_index];
266 n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
267 while (s->fake_picture_number < n) {
268 mpeg1_skip_picture(s, s->fake_picture_number -
269 s->gop_picture_number);
270 s->fake_picture_number++;
276 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
278 put_bits(&s->pb, 11, 0x008);
281 put_bits(&s->pb, mbAddrIncrTable[run][1],
282 mbAddrIncrTable[run][0]);
285 /* insert a fake P picture */
286 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
288 /* mpeg1 picture header */
289 put_header(s, PICTURE_START_CODE);
290 /* temporal reference */
291 put_bits(&s->pb, 10, pict_num & 0x3ff);
293 put_bits(&s->pb, 3, P_TYPE);
294 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
296 put_bits(&s->pb, 1, 1); /* integer coordinates */
297 put_bits(&s->pb, 3, 1); /* forward_f_code */
299 put_bits(&s->pb, 1, 0); /* extra bit picture */
302 put_header(s, SLICE_MIN_START_CODE);
303 put_bits(&s->pb, 5, 1); /* quantizer scale */
304 put_bits(&s->pb, 1, 0); /* slice extra information */
306 encode_mb_skip_run(s, 0);
308 /* empty macroblock */
309 put_bits(&s->pb, 3, 1); /* motion only */
311 /* zero motion x & y */
312 put_bits(&s->pb, 1, 1);
313 put_bits(&s->pb, 1, 1);
315 /* output a number of empty slice */
316 encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
318 /* empty macroblock */
319 put_bits(&s->pb, 3, 1); /* motion only */
321 /* zero motion x & y */
322 put_bits(&s->pb, 1, 1);
323 put_bits(&s->pb, 1, 1);
327 static void common_init(MpegEncContext *s)
330 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
333 void ff_mpeg1_clean_buffers(MpegEncContext *s){
334 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
335 s->last_dc[1] = s->last_dc[0];
336 s->last_dc[2] = s->last_dc[0];
337 memset(s->last_mv, 0, sizeof(s->last_mv));
340 #ifdef CONFIG_ENCODERS
342 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
343 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
344 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
345 put_bits(&s->pb, 1, 0); /* slice extra information */
348 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
350 mpeg1_encode_sequence_header(s);
352 /* mpeg1 picture header */
353 put_header(s, PICTURE_START_CODE);
354 /* temporal reference */
356 // RAL: s->picture_number instead of s->fake_picture_number
357 put_bits(&s->pb, 10, (s->picture_number -
358 s->gop_picture_number) & 0x3ff);
359 s->fake_picture_number++;
361 put_bits(&s->pb, 3, s->pict_type);
362 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
364 // RAL: Forward f_code also needed for B frames
365 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
366 put_bits(&s->pb, 1, 0); /* half pel coordinates */
367 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
370 // RAL: Backward f_code necessary for B frames
371 if (s->pict_type == B_TYPE) {
372 put_bits(&s->pb, 1, 0); /* half pel coordinates */
373 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
376 put_bits(&s->pb, 1, 0); /* extra bit picture */
379 ff_mpeg1_encode_slice_header(s);
382 void mpeg1_encode_mb(MpegEncContext *s,
383 DCTELEM block[6][64],
384 int motion_x, int motion_y)
387 const int mb_x = s->mb_x;
388 const int mb_y = s->mb_y;
389 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
394 if (s->block_last_index[i] >= 0)
398 if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || mb_y != s->mb_height - 1) &&
399 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
400 (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) |
401 ((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))) {
403 s->qscale -= s->dquant;
409 assert(s->mb_skip_run == 0);
410 encode_mb_skip_run(s, s->mb_x);
412 encode_mb_skip_run(s, s->mb_skip_run);
415 if (s->pict_type == I_TYPE) {
416 if(s->dquant && cbp){
417 put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
418 put_bits(&s->pb, 5, s->qscale);
420 put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
421 s->qscale -= s->dquant;
423 s->misc_bits+= get_bits_diff(s);
425 } else if (s->mb_intra) {
426 if(s->dquant && cbp){
427 put_bits(&s->pb, 6, 0x01);
428 put_bits(&s->pb, 5, s->qscale);
430 put_bits(&s->pb, 5, 0x03);
431 s->qscale -= s->dquant;
433 s->misc_bits+= get_bits_diff(s);
435 s->last_mv[0][0][0] =
436 s->last_mv[0][0][1] = 0;
437 } else if (s->pict_type == P_TYPE) {
439 if (motion_x == 0 && motion_y == 0) {
441 put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
442 put_bits(&s->pb, 5, s->qscale);
444 put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
446 s->misc_bits+= get_bits_diff(s);
447 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
450 put_bits(&s->pb, 5, 2); /* motion + cbp */
451 put_bits(&s->pb, 5, s->qscale);
453 put_bits(&s->pb, 1, 1); /* motion + cbp */
455 s->misc_bits+= get_bits_diff(s);
456 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
457 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
458 s->mv_bits+= get_bits_diff(s);
459 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
462 put_bits(&s->pb, 3, 1); /* motion only */
463 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
464 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
465 s->qscale -= s->dquant;
466 s->mv_bits+= get_bits_diff(s);
470 { // RAL: All the following bloc added for B frames:
472 { // With coded bloc pattern
473 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
474 { // Bi-directional motion
477 put_bits(&s->pb, 5, 2);
478 put_bits(&s->pb, 5, s->qscale);
480 else // Without QScale
481 put_bits(&s->pb, 2, 3);
482 s->misc_bits += get_bits_diff(s);
483 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
484 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
485 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
486 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
489 s->mv_bits += get_bits_diff(s);
490 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
492 else if (s->mv_dir == MV_DIR_BACKWARD)
496 put_bits(&s->pb, 6, 2);
497 put_bits(&s->pb, 5, s->qscale);
499 else // Without QScale
500 put_bits(&s->pb, 3, 3);
501 s->misc_bits += get_bits_diff(s);
502 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
503 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
505 s->mv_bits += get_bits_diff(s);
506 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
508 else if (s->mv_dir == MV_DIR_FORWARD)
512 put_bits(&s->pb, 6, 3);
513 put_bits(&s->pb, 5, s->qscale);
515 else // Without QScale
516 put_bits(&s->pb, 4, 3);
517 s->misc_bits += get_bits_diff(s);
518 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
519 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
521 s->mv_bits += get_bits_diff(s);
522 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
526 { // No coded bloc pattern
527 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
528 { // Bi-directional motion
529 put_bits(&s->pb, 2, 2); /* backward & forward motion */
530 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
531 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
532 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
533 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
537 else if (s->mv_dir == MV_DIR_BACKWARD)
539 put_bits(&s->pb, 3, 2); /* backward motion only */
540 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
541 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
544 else if (s->mv_dir == MV_DIR_FORWARD)
546 put_bits(&s->pb, 4, 2); /* forward motion only */
547 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
548 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
551 s->qscale -= s->dquant;
552 s->mv_bits += get_bits_diff(s);
554 // End of bloc from RAL
557 if (cbp & (1 << (5 - i))) {
558 mpeg1_encode_block(s, block[i], i);
563 s->i_tex_bits+= get_bits_diff(s);
565 s->p_tex_bits+= get_bits_diff(s);
569 if (s->mv_dir & MV_DIR_FORWARD)
571 s->last_mv[0][0][0]= s->mv[0][0][0];
572 s->last_mv[0][0][1]= s->mv[0][0][1];
574 if (s->mv_dir & MV_DIR_BACKWARD)
576 s->last_mv[1][0][0]= s->mv[1][0][0];
577 s->last_mv[1][0][1]= s->mv[1][0][1];
581 // RAL: Parameter added: f_or_b_code
582 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
584 int code, bit_size, l, m, bits, range, sign;
590 mbMotionVectorTable[0][1],
591 mbMotionVectorTable[0][0]);
593 bit_size = f_or_b_code - 1;
594 range = 1 << bit_size;
595 /* modulo encoding */
600 } else if (val >= l) {
606 code = (val >> bit_size) + 1;
607 bits = val & (range - 1);
612 code = (val >> bit_size) + 1;
613 bits = val & (range - 1);
617 assert(code > 0 && code <= 16);
620 mbMotionVectorTable[code][1],
621 mbMotionVectorTable[code][0]);
623 put_bits(&s->pb, 1, sign);
625 put_bits(&s->pb, bit_size, bits);
630 void ff_mpeg1_encode_init(MpegEncContext *s)
646 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
647 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
650 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
652 /* build unified dc encoding tables */
653 for(i=-255; i<256; i++)
661 index = vlc_dc_table[adiff];
663 bits= vlc_dc_lum_bits[index] + index;
664 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
665 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
667 bits= vlc_dc_chroma_bits[index] + index;
668 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
669 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
672 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
674 for(f_code=1; f_code<=MAX_FCODE; f_code++){
675 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
678 if(mv==0) len= mbMotionVectorTable[0][1];
680 int val, bit_size, range, code;
682 bit_size = s->f_code - 1;
683 range = 1 << bit_size;
689 code = (val >> bit_size) + 1;
691 len= mbMotionVectorTable[code][1] + 1 + bit_size;
693 len= mbMotionVectorTable[16][1] + 2 + bit_size;
697 mv_penalty[f_code][mv+MAX_MV]= len;
702 for(f_code=MAX_FCODE; f_code>0; f_code--){
703 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
704 fcode_tab[mv+MAX_MV]= f_code;
708 s->me.mv_penalty= mv_penalty;
709 s->fcode_tab= fcode_tab;
712 s->intra_ac_vlc_length=
713 s->inter_ac_vlc_length= uni_mpeg1_ac_vlc_len;
716 static inline void encode_dc(MpegEncContext *s, int diff, int component)
718 if (component == 0) {
721 mpeg1_lum_dc_uni[diff+255]&0xFF,
722 mpeg1_lum_dc_uni[diff+255]>>8);
726 mpeg1_chr_dc_uni[diff+255]&0xFF,
727 mpeg1_chr_dc_uni[diff+255]>>8);
731 static void mpeg1_encode_block(MpegEncContext *s,
735 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
737 // RLTable *rl = &rl_mpeg1;
739 last_index = s->block_last_index[n];
743 component = (n <= 3 ? 0 : n - 4 + 1);
744 dc = block[0]; /* overflow is impossible */
745 diff = dc - s->last_dc[component];
746 encode_dc(s, diff, component);
747 s->last_dc[component] = dc;
750 /* encode the first coefficient : needs to be done here because
751 it is handled slightly differently */
753 if (abs(level) == 1) {
754 code = ((uint32_t)level >> 31); /* the sign bit */
755 put_bits(&s->pb, 2, code | 0x02);
764 /* now quantify & encode AC coefs */
765 last_non_zero = i - 1;
767 for(;i<=last_index;i++) {
768 j = s->intra_scantable.permutated[i];
773 dprintf("level[%d]=%d\n", i, level);
775 /* encode using VLC */
777 run = i - last_non_zero - 1;
780 MASK_ABS(sign, alevel)
783 // code = get_rl_index(rl, 0, run, alevel);
784 if (alevel <= mpeg1_max_level[0][run]){
785 code= mpeg1_index_run[0][run] + alevel - 1;
786 /* store the vlc & sign at once */
787 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
789 /* escape seems to be pretty rare <5% so i dont optimize it */
790 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
791 /* escape: only clip in this case */
792 put_bits(&s->pb, 6, run);
794 put_bits(&s->pb, 8, level & 0xff);
797 put_bits(&s->pb, 16, 0x8001 + level + 255);
799 put_bits(&s->pb, 16, level & 0xffff);
807 put_bits(&s->pb, 2, 0x2);
809 #endif //CONFIG_ENCODERS
811 /******************************************/
814 static VLC dc_lum_vlc;
815 static VLC dc_chroma_vlc;
817 static VLC mbincr_vlc;
818 static VLC mb_ptype_vlc;
819 static VLC mb_btype_vlc;
820 static VLC mb_pat_vlc;
822 static void init_vlcs(MpegEncContext *s)
829 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
830 vlc_dc_lum_bits, 1, 1,
831 vlc_dc_lum_code, 2, 2);
832 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
833 vlc_dc_chroma_bits, 1, 1,
834 vlc_dc_chroma_code, 2, 2);
835 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
836 &mbMotionVectorTable[0][1], 2, 1,
837 &mbMotionVectorTable[0][0], 2, 1);
838 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
839 &mbAddrIncrTable[0][1], 2, 1,
840 &mbAddrIncrTable[0][0], 2, 1);
841 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
842 &mbPatTable[0][1], 2, 1,
843 &mbPatTable[0][0], 2, 1);
845 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
846 &table_mb_ptype[0][1], 2, 1,
847 &table_mb_ptype[0][0], 2, 1);
848 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
849 &table_mb_btype[0][1], 2, 1,
850 &table_mb_btype[0][0], 2, 1);
854 init_2d_vlc_rl(&rl_mpeg1);
855 init_2d_vlc_rl(&rl_mpeg2);
859 static inline int get_dmv(MpegEncContext *s)
861 if(get_bits1(&s->gb))
862 return 1 - (get_bits1(&s->gb) << 1);
867 static inline int get_qscale(MpegEncContext *s)
869 int qscale = get_bits(&s->gb, 5);
871 if (s->q_scale_type) {
872 return non_linear_qscale[qscale];
880 /* motion type (for mpeg2) */
886 static int mpeg_decode_mb(MpegEncContext *s,
887 DCTELEM block[6][64])
889 int i, j, k, cbp, val, mb_type, motion_type;
891 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
893 assert(s->mb_skiped==0);
895 if (s->mb_skip_run-- != 0) {
896 if(s->pict_type == I_TYPE){
897 fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
904 s->block_last_index[i] = -1;
905 s->mv_type = MV_TYPE_16X16;
906 if (s->pict_type == P_TYPE) {
907 /* if P type, zero motion vector is implied */
908 s->mv_dir = MV_DIR_FORWARD;
909 s->mv[0][0][0] = s->mv[0][0][1] = 0;
910 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
911 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
913 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
915 /* if B type, reuse previous vectors and directions */
916 s->mv[0][0][0] = s->last_mv[0][0][0];
917 s->mv[0][0][1] = s->last_mv[0][0][1];
918 s->mv[1][0][0] = s->last_mv[1][0][0];
919 s->mv[1][0][1] = s->last_mv[1][0][1];
921 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
922 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
923 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
925 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
932 switch(s->pict_type) {
935 if (get_bits1(&s->gb) == 0) {
936 if (get_bits1(&s->gb) == 0){
937 fprintf(stderr, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
940 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
942 mb_type = MB_TYPE_INTRA;
946 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
948 fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
951 mb_type = ptype2mb_type[ mb_type ];
954 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
956 fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
959 mb_type = btype2mb_type[ mb_type ];
962 dprintf("mb_type=%x\n", mb_type);
963 // motion_type = 0; /* avoid warning */
964 if (IS_INTRA(mb_type)) {
965 /* compute dct type */
966 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
967 !s->frame_pred_frame_dct) {
968 s->interlaced_dct = get_bits1(&s->gb);
971 if (IS_QUANT(mb_type))
972 s->qscale = get_qscale(s);
974 if (s->concealment_motion_vectors) {
975 /* just parse them */
976 if (s->picture_structure != PICT_FRAME)
977 skip_bits1(&s->gb); /* field select */
979 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
980 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
981 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
982 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
984 skip_bits1(&s->gb); /* marker */
986 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
991 if (mpeg2_decode_block_intra(s, block[i], i) < 0)
996 if (mpeg1_decode_block_intra(s, block[i], i) < 0)
1001 if (mb_type & MB_TYPE_ZERO_MV){
1002 assert(mb_type & MB_TYPE_PAT);
1004 /* compute dct type */
1005 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1006 !s->frame_pred_frame_dct) {
1007 s->interlaced_dct = get_bits1(&s->gb);
1010 if (IS_QUANT(mb_type))
1011 s->qscale = get_qscale(s);
1013 s->mv_dir = MV_DIR_FORWARD;
1014 s->mv_type = MV_TYPE_16X16;
1015 s->last_mv[0][0][0] = 0;
1016 s->last_mv[0][0][1] = 0;
1017 s->last_mv[0][1][0] = 0;
1018 s->last_mv[0][1][1] = 0;
1022 assert(mb_type & MB_TYPE_L0L1);
1023 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1024 /* get additionnal motion vector type */
1025 if (s->frame_pred_frame_dct)
1026 motion_type = MT_FRAME;
1028 motion_type = get_bits(&s->gb, 2);
1031 /* compute dct type */
1032 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1033 !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1034 s->interlaced_dct = get_bits1(&s->gb);
1037 if (IS_QUANT(mb_type))
1038 s->qscale = get_qscale(s);
1040 /* motion vectors */
1043 if (USES_LIST(mb_type, i)) {
1044 s->mv_dir |= (MV_DIR_FORWARD >> i);
1045 dprintf("motion_type=%d\n", motion_type);
1046 switch(motion_type) {
1047 case MT_FRAME: /* or MT_16X8 */
1048 if (s->picture_structure == PICT_FRAME) {
1050 mb_type |= MB_TYPE_16x16;
1051 s->mv_type = MV_TYPE_16X16;
1052 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1053 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1054 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1055 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1056 /* full_pel: only for mpeg1 */
1057 if (s->full_pel[i]){
1058 s->mv[i][0][0] <<= 1;
1059 s->mv[i][0][1] <<= 1;
1063 mb_type |= MB_TYPE_16x8;
1064 s->mv_type = MV_TYPE_16X8;
1066 s->field_select[i][j] = get_bits1(&s->gb);
1068 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1069 s->last_mv[i][j][k]);
1070 s->last_mv[i][j][k] = val;
1071 s->mv[i][j][k] = val;
1077 s->mv_type = MV_TYPE_FIELD;
1078 if (s->picture_structure == PICT_FRAME) {
1079 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1081 s->field_select[i][j] = get_bits1(&s->gb);
1082 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1083 s->last_mv[i][j][0]);
1084 s->last_mv[i][j][0] = val;
1085 s->mv[i][j][0] = val;
1086 dprintf("fmx=%d\n", val);
1087 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1088 s->last_mv[i][j][1] >> 1);
1089 s->last_mv[i][j][1] = val << 1;
1090 s->mv[i][j][1] = val;
1091 dprintf("fmy=%d\n", val);
1094 mb_type |= MB_TYPE_16x16;
1095 s->field_select[i][0] = get_bits1(&s->gb);
1097 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1098 s->last_mv[i][0][k]);
1099 s->last_mv[i][0][k] = val;
1100 s->last_mv[i][1][k] = val;
1101 s->mv[i][0][k] = val;
1107 int dmx, dmy, mx, my, m;
1109 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1110 s->last_mv[i][0][0]);
1111 s->last_mv[i][0][0] = mx;
1112 s->last_mv[i][1][0] = mx;
1114 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1115 s->last_mv[i][0][1] >> 1);
1117 s->mv_type = MV_TYPE_DMV;
1120 s->last_mv[i][0][1] = my<<1;
1121 s->last_mv[i][1][1] = my<<1;
1123 s->mv[i][0][0] = mx;
1124 s->mv[i][0][1] = my;
1125 s->mv[i][1][0] = mx;//not used
1126 s->mv[i][1][1] = my;//not used
1128 if (s->picture_structure == PICT_FRAME) {
1129 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1131 //m = 1 + 2 * s->top_field_first;
1132 m = s->top_field_first ? 1 : 3;
1134 /* top -> top pred */
1135 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1136 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1138 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1139 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1141 mb_type |= MB_TYPE_16x16;
1143 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1144 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1145 if(s->picture_structure == PICT_TOP_FIELD)
1159 if (IS_PAT(mb_type)) {
1160 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1162 fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1170 if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
1173 s->block_last_index[i] = -1;
1180 if (mpeg1_decode_block_inter(s, block[i], i) < 0)
1183 s->block_last_index[i] = -1;
1190 s->block_last_index[i] = -1;
1194 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1199 /* as h263, but only 17 codes */
1200 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1202 int code, sign, val, l, shift;
1204 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1212 sign = get_bits1(&s->gb);
1216 val = (val - 1) << shift;
1217 val |= get_bits(&s->gb, shift);
1224 /* modulo decoding */
1226 val = ((val + l)&(l*2-1)) - l;
1230 static inline int decode_dc(MpegEncContext *s, int component)
1234 if (component == 0) {
1235 code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1237 code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1240 fprintf(stderr, "invalid dc code at %d %d\n", s->mb_x, s->mb_y);
1246 diff = get_xbits(&s->gb, code);
1251 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1255 int level, dc, diff, i, j, run;
1257 RLTable *rl = &rl_mpeg1;
1258 uint8_t * const scantable= s->intra_scantable.permutated;
1259 const uint16_t *quant_matrix= s->intra_matrix;
1260 const int qscale= s->qscale;
1263 component = (n <= 3 ? 0 : n - 4 + 1);
1264 diff = decode_dc(s, component);
1267 dc = s->last_dc[component];
1269 s->last_dc[component] = dc;
1271 dprintf("dc=%d diff=%d\n", dc, diff);
1274 OPEN_READER(re, &s->gb);
1275 /* now quantify & encode AC coefs */
1277 UPDATE_CACHE(re, &s->gb);
1278 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1282 } else if(level != 0) {
1285 level= (level*qscale*quant_matrix[j])>>3;
1287 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1288 LAST_SKIP_BITS(re, &s->gb, 1);
1291 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1292 UPDATE_CACHE(re, &s->gb);
1293 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1294 if (level == -128) {
1295 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1296 } else if (level == 0) {
1297 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1303 level= (level*qscale*quant_matrix[j])>>3;
1307 level= (level*qscale*quant_matrix[j])>>3;
1312 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1318 CLOSE_READER(re, &s->gb);
1320 s->block_last_index[n] = i;
1324 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1328 int level, i, j, run;
1329 RLTable *rl = &rl_mpeg1;
1330 uint8_t * const scantable= s->intra_scantable.permutated;
1331 const uint16_t *quant_matrix= s->inter_matrix;
1332 const int qscale= s->qscale;
1336 OPEN_READER(re, &s->gb);
1338 /* special case for the first coef. no need to add a second vlc table */
1339 UPDATE_CACHE(re, &s->gb);
1340 v= SHOW_UBITS(re, &s->gb, 2);
1342 LAST_SKIP_BITS(re, &s->gb, 2);
1343 level= (3*qscale*quant_matrix[0])>>4;
1351 /* now quantify & encode AC coefs */
1353 UPDATE_CACHE(re, &s->gb);
1354 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1358 } else if(level != 0) {
1361 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1363 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1364 LAST_SKIP_BITS(re, &s->gb, 1);
1367 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1368 UPDATE_CACHE(re, &s->gb);
1369 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1370 if (level == -128) {
1371 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1372 } else if (level == 0) {
1373 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1379 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1383 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1388 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1394 CLOSE_READER(re, &s->gb);
1396 s->block_last_index[n] = i;
1400 /* Also does unquantization here, since I will never support mpeg2
1402 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1406 int level, i, j, run;
1407 RLTable *rl = &rl_mpeg1;
1408 uint8_t * const scantable= s->intra_scantable.permutated;
1409 const uint16_t *quant_matrix;
1410 const int qscale= s->qscale;
1417 OPEN_READER(re, &s->gb);
1420 quant_matrix = s->inter_matrix;
1422 quant_matrix = s->chroma_inter_matrix;
1424 /* special case for the first coef. no need to add a second vlc table */
1425 UPDATE_CACHE(re, &s->gb);
1426 v= SHOW_UBITS(re, &s->gb, 2);
1428 LAST_SKIP_BITS(re, &s->gb, 2);
1429 level= (3*qscale*quant_matrix[0])>>5;
1437 /* now quantify & encode AC coefs */
1439 UPDATE_CACHE(re, &s->gb);
1440 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1444 } else if(level != 0) {
1447 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1448 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1449 LAST_SKIP_BITS(re, &s->gb, 1);
1452 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1453 UPDATE_CACHE(re, &s->gb);
1454 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1459 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1462 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1466 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1473 CLOSE_READER(re, &s->gb);
1475 block[63] ^= (mismatch & 1);
1477 s->block_last_index[n] = i;
1481 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1485 int level, dc, diff, i, j, run;
1488 uint8_t * const scantable= s->intra_scantable.permutated;
1489 const uint16_t *quant_matrix;
1490 const int qscale= s->qscale;
1495 quant_matrix = s->intra_matrix;
1498 quant_matrix = s->chroma_intra_matrix;
1501 diff = decode_dc(s, component);
1504 dc = s->last_dc[component];
1506 s->last_dc[component] = dc;
1507 block[0] = dc << (3 - s->intra_dc_precision);
1508 dprintf("dc=%d\n", block[0]);
1509 mismatch = block[0] ^ 1;
1511 if (s->intra_vlc_format)
1517 OPEN_READER(re, &s->gb);
1518 /* now quantify & encode AC coefs */
1520 UPDATE_CACHE(re, &s->gb);
1521 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1525 } else if(level != 0) {
1528 level= (level*qscale*quant_matrix[j])>>4;
1529 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1530 LAST_SKIP_BITS(re, &s->gb, 1);
1533 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1534 UPDATE_CACHE(re, &s->gb);
1535 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1539 level= (-level*qscale*quant_matrix[j])>>4;
1542 level= (level*qscale*quant_matrix[j])>>4;
1546 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1553 CLOSE_READER(re, &s->gb);
1555 block[63]^= mismatch&1;
1557 s->block_last_index[n] = i;
1561 typedef struct Mpeg1Context {
1562 MpegEncContext mpeg_enc_ctx;
1563 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1564 int repeat_field; /* true if we must repeat the field */
1567 static int mpeg_decode_init(AVCodecContext *avctx)
1569 Mpeg1Context *s = avctx->priv_data;
1571 s->mpeg_enc_ctx.flags= avctx->flags;
1572 common_init(&s->mpeg_enc_ctx);
1573 init_vlcs(&s->mpeg_enc_ctx);
1575 s->mpeg_enc_ctx_allocated = 0;
1576 s->mpeg_enc_ctx.picture_number = 0;
1577 s->repeat_field = 0;
1578 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1582 /* return the 8 bit start code value and update the search
1583 state. Return -1 if no start code found */
1584 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1587 unsigned int state=0xFFFFFFFF, v;
1590 buf_ptr = *pbuf_ptr;
1591 while (buf_ptr < buf_end) {
1593 if (state == 0x000001) {
1594 state = ((state << 8) | v) & 0xffffff;
1598 state = ((state << 8) | v) & 0xffffff;
1602 *pbuf_ptr = buf_ptr;
1606 static int mpeg1_decode_picture(AVCodecContext *avctx,
1607 uint8_t *buf, int buf_size)
1609 Mpeg1Context *s1 = avctx->priv_data;
1610 MpegEncContext *s = &s1->mpeg_enc_ctx;
1613 init_get_bits(&s->gb, buf, buf_size*8);
1615 ref = get_bits(&s->gb, 10); /* temporal ref */
1616 s->pict_type = get_bits(&s->gb, 3);
1617 dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1619 skip_bits(&s->gb, 16);
1620 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1621 s->full_pel[0] = get_bits1(&s->gb);
1622 f_code = get_bits(&s->gb, 3);
1625 s->mpeg_f_code[0][0] = f_code;
1626 s->mpeg_f_code[0][1] = f_code;
1628 if (s->pict_type == B_TYPE) {
1629 s->full_pel[1] = get_bits1(&s->gb);
1630 f_code = get_bits(&s->gb, 3);
1633 s->mpeg_f_code[1][0] = f_code;
1634 s->mpeg_f_code[1][1] = f_code;
1636 s->current_picture.pict_type= s->pict_type;
1637 s->current_picture.key_frame= s->pict_type == I_TYPE;
1645 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1647 int horiz_size_ext, vert_size_ext;
1648 int bit_rate_ext, vbv_buf_ext;
1649 int frame_rate_ext_n, frame_rate_ext_d;
1652 skip_bits(&s->gb, 8); /* profil and level */
1653 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1654 skip_bits(&s->gb, 2); /* chroma_format */
1655 horiz_size_ext = get_bits(&s->gb, 2);
1656 vert_size_ext = get_bits(&s->gb, 2);
1657 s->width |= (horiz_size_ext << 12);
1658 s->height |= (vert_size_ext << 12);
1659 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1660 s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1661 skip_bits1(&s->gb); /* marker */
1662 vbv_buf_ext = get_bits(&s->gb, 8);
1664 s->low_delay = get_bits1(&s->gb);
1665 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1667 frame_rate_ext_n = get_bits(&s->gb, 2);
1668 frame_rate_ext_d = get_bits(&s->gb, 5);
1670 &s->avctx->frame_rate,
1671 &s->avctx->frame_rate_base,
1672 frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1673 MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1676 dprintf("sequence extension\n");
1678 s->avctx->sub_id = 2; /* indicates mpeg2 found */
1680 aspect= mpeg2_aspect[s->aspect_ratio_info];
1681 if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
1682 else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
1685 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1689 dprintf("matrix extension\n");
1691 if (get_bits1(&s->gb)) {
1693 v = get_bits(&s->gb, 8);
1694 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1695 s->intra_matrix[j] = v;
1696 s->chroma_intra_matrix[j] = v;
1699 if (get_bits1(&s->gb)) {
1701 v = get_bits(&s->gb, 8);
1702 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1703 s->inter_matrix[j] = v;
1704 s->chroma_inter_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_intra_matrix[j] = v;
1714 if (get_bits1(&s->gb)) {
1716 v = get_bits(&s->gb, 8);
1717 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1718 s->chroma_inter_matrix[j] = v;
1723 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1725 s->full_pel[0] = s->full_pel[1] = 0;
1726 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1727 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1728 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1729 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1730 s->intra_dc_precision = get_bits(&s->gb, 2);
1731 s->picture_structure = get_bits(&s->gb, 2);
1732 s->top_field_first = get_bits1(&s->gb);
1733 s->frame_pred_frame_dct = get_bits1(&s->gb);
1734 s->concealment_motion_vectors = get_bits1(&s->gb);
1735 s->q_scale_type = get_bits1(&s->gb);
1736 s->intra_vlc_format = get_bits1(&s->gb);
1737 s->alternate_scan = get_bits1(&s->gb);
1738 s->repeat_first_field = get_bits1(&s->gb);
1739 s->chroma_420_type = get_bits1(&s->gb);
1740 s->progressive_frame = get_bits1(&s->gb);
1742 if(s->picture_structure == PICT_FRAME)
1745 s->first_field ^= 1;
1746 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1749 if(s->alternate_scan){
1750 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1751 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1752 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1753 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1755 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1756 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1757 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1758 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1761 /* composite display not parsed */
1762 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1763 dprintf("picture_structure=%d\n", s->picture_structure);
1764 dprintf("top field first=%d\n", s->top_field_first);
1765 dprintf("repeat first field=%d\n", s->repeat_first_field);
1766 dprintf("conceal=%d\n", s->concealment_motion_vectors);
1767 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1768 dprintf("alternate_scan=%d\n", s->alternate_scan);
1769 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1770 dprintf("progressive_frame=%d\n", s->progressive_frame);
1773 static void mpeg_decode_extension(AVCodecContext *avctx,
1774 uint8_t *buf, int buf_size)
1776 Mpeg1Context *s1 = avctx->priv_data;
1777 MpegEncContext *s = &s1->mpeg_enc_ctx;
1780 init_get_bits(&s->gb, buf, buf_size*8);
1782 ext_type = get_bits(&s->gb, 4);
1786 mpeg_decode_sequence_extension(s);
1789 /* quant matrix extension */
1790 mpeg_decode_quant_matrix_extension(s);
1793 /* picture extension */
1794 mpeg_decode_picture_coding_extension(s);
1799 static void exchange_uv(AVFrame *f){
1800 uint8_t *t= f->data[1];
1801 f->data[1]= f->data[2];
1805 #define DECODE_SLICE_FATAL_ERROR -2
1806 #define DECODE_SLICE_ERROR -1
1807 #define DECODE_SLICE_OK 0
1811 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1812 * DECODE_SLICE_ERROR if the slice is damaged<br>
1813 * DECODE_SLICE_OK if this slice is ok<br>
1815 static int mpeg_decode_slice(AVCodecContext *avctx,
1818 uint8_t **buf, int buf_size)
1820 Mpeg1Context *s1 = avctx->priv_data;
1821 MpegEncContext *s = &s1->mpeg_enc_ctx;
1823 const int field_pic= s->picture_structure != PICT_FRAME;
1825 s->resync_mb_x= s->mb_x =
1826 s->resync_mb_y= s->mb_y = -1;
1828 start_code = (start_code - 1) & 0xff;
1829 if (start_code >= s->mb_height){
1830 fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
1834 ff_mpeg1_clean_buffers(s);
1835 s->interlaced_dct = 0;
1837 /* start frame decoding */
1838 if (s->first_slice) {
1839 if(s->first_field || s->picture_structure==PICT_FRAME){
1840 if(MPV_frame_start(s, avctx) < 0)
1841 return DECODE_SLICE_FATAL_ERROR;
1843 ff_er_frame_start(s);
1845 /* first check if we must repeat the frame */
1846 s->current_picture_ptr->repeat_pict = 0;
1847 if (s->repeat_first_field) {
1848 if (s->progressive_sequence) {
1849 if (s->top_field_first)
1850 s->current_picture_ptr->repeat_pict = 4;
1852 s->current_picture_ptr->repeat_pict = 2;
1853 } else if (s->progressive_frame) {
1854 s->current_picture_ptr->repeat_pict = 1;
1857 //printf("%d\n", s->current_picture_ptr->repeat_pict);
1859 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1860 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",
1861 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],
1862 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1863 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1864 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1865 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1867 }else{ //second field
1870 if(!s->current_picture_ptr){
1871 fprintf(stderr, "first field missing\n");
1876 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1877 if(s->picture_structure == PICT_BOTTOM_FIELD){
1878 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1883 // MPV_frame_start will call this function too,
1884 // but we need to call it on every field
1885 if(s->avctx->xvmc_acceleration)
1886 XVMC_field_start(s,avctx);
1888 }//fi(s->first_slice)
1891 init_get_bits(&s->gb, *buf, buf_size*8);
1893 s->qscale = get_qscale(s);
1895 fprintf(stderr, "qscale == 0\n");
1899 /* extra slice info */
1900 while (get_bits1(&s->gb) != 0) {
1901 skip_bits(&s->gb, 8);
1907 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1909 fprintf(stderr, "first mb_incr damaged\n");
1916 /* otherwise, stuffing, nothing to do */
1923 s->resync_mb_x= s->mb_x;
1924 s->resync_mb_y= s->mb_y = start_code;
1926 ff_init_block_index(s);
1929 s->dsp.clear_blocks(s->block[0]);
1931 ret = mpeg_decode_mb(s, s->block);
1933 dprintf("ret=%d\n", ret);
1937 if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
1938 const int wrap = s->block_wrap[0];
1939 const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
1940 int motion_x, motion_y;
1943 motion_x = motion_y = 0;
1944 }else if (s->mv_type == MV_TYPE_16X16) {
1945 motion_x = s->mv[0][0][0];
1946 motion_y = s->mv[0][0][1];
1947 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
1948 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
1949 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
1950 motion_x = (motion_x>>1) | (motion_x&1);
1952 s->motion_val[xy][0] = motion_x;
1953 s->motion_val[xy][1] = motion_y;
1954 s->motion_val[xy + 1][0] = motion_x;
1955 s->motion_val[xy + 1][1] = motion_y;
1956 s->motion_val[xy + wrap][0] = motion_x;
1957 s->motion_val[xy + wrap][1] = motion_y;
1958 s->motion_val[xy + 1 + wrap][0] = motion_x;
1959 s->motion_val[xy + 1 + wrap][1] = motion_y;
1966 MPV_decode_mb(s, s->block);
1968 if (++s->mb_x >= s->mb_width) {
1969 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
1970 exchange_uv((AVFrame*)s->current_picture_ptr);
1972 ff_draw_horiz_band(s, 16*s->mb_y, 16);
1974 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
1975 exchange_uv((AVFrame*)s->current_picture_ptr);
1980 if(s->mb_y<<field_pic >= s->mb_height){
1981 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1983 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
1984 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1985 fprintf(stderr, "end missmatch left=%d\n", left);
1991 ff_init_block_index(s);
1994 /* skip mb handling */
1995 if (s->mb_skip_run == -1) {
1996 /* read again increment */
1999 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2001 fprintf(stderr, "mb incr damaged\n");
2006 s->mb_skip_run += 33;
2007 }else if(code == 35){
2008 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2009 fprintf(stderr, "slice missmatch\n");
2012 goto eos; /* end of slice */
2014 /* otherwise, stuffing, nothing to do */
2016 s->mb_skip_run += code;
2022 eos: // end of slice
2023 *buf += get_bits_count(&s->gb)/8 - 1;
2024 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2029 * handles slice ends.
2030 * @return 1 if it seems to be the last slice of
2032 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2034 Mpeg1Context *s1 = avctx->priv_data;
2035 MpegEncContext *s = &s1->mpeg_enc_ctx;
2037 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2041 if(s->avctx->xvmc_acceleration)
2044 /* end of slice reached */
2045 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2049 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2051 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2057 if (s->pict_type == B_TYPE || s->low_delay) {
2058 *pict= *(AVFrame*)s->current_picture_ptr;
2059 ff_print_debug_info(s, s->current_picture_ptr);
2061 s->picture_number++;
2062 /* latency of 1 frame for I and P frames */
2063 /* XXX: use another variable than picture_number */
2064 if (s->last_picture_ptr != NULL) {
2065 *pict= *(AVFrame*)s->last_picture_ptr;
2066 ff_print_debug_info(s, s->last_picture_ptr);
2069 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2078 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2079 uint8_t *buf, int buf_size)
2081 Mpeg1Context *s1 = avctx->priv_data;
2082 MpegEncContext *s = &s1->mpeg_enc_ctx;
2083 int width, height, i, v, j;
2086 init_get_bits(&s->gb, buf, buf_size*8);
2088 width = get_bits(&s->gb, 12);
2089 height = get_bits(&s->gb, 12);
2090 s->aspect_ratio_info= get_bits(&s->gb, 4);
2092 aspect= mpeg1_aspect[s->aspect_ratio_info];
2093 if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
2096 s->frame_rate_index = get_bits(&s->gb, 4);
2097 if (s->frame_rate_index == 0)
2099 s->bit_rate = get_bits(&s->gb, 18) * 400;
2100 if (get_bits1(&s->gb) == 0) /* marker */
2102 if (width <= 0 || height <= 0 ||
2103 (width % 2) != 0 || (height % 2) != 0)
2105 if (width != s->width ||
2106 height != s->height) {
2107 /* start new mpeg1 context decoding */
2108 s->out_format = FMT_MPEG1;
2109 if (s1->mpeg_enc_ctx_allocated) {
2114 avctx->has_b_frames= 1;
2116 avctx->width = width;
2117 avctx->height = height;
2120 &avctx->frame_rate_base,
2121 frame_rate_tab[s->frame_rate_index],
2122 MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2125 avctx->bit_rate = s->bit_rate;
2127 //get_format() or set_video(width,height,aspect,pix_fmt);
2128 //until then pix_fmt may be changed right after codec init
2129 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2130 avctx->idct_algo = FF_IDCT_SIMPLE;
2132 if (MPV_common_init(s) < 0)
2134 s1->mpeg_enc_ctx_allocated = 1;
2137 skip_bits(&s->gb, 10); /* vbv_buffer_size */
2138 skip_bits(&s->gb, 1);
2141 if (get_bits1(&s->gb)) {
2143 v = get_bits(&s->gb, 8);
2144 j = s->intra_scantable.permutated[i];
2145 s->intra_matrix[j] = v;
2146 s->chroma_intra_matrix[j] = v;
2149 dprintf("intra matrix present\n");
2151 dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2156 int j= s->dsp.idct_permutation[i];
2157 v = ff_mpeg1_default_intra_matrix[i];
2158 s->intra_matrix[j] = v;
2159 s->chroma_intra_matrix[j] = v;
2162 if (get_bits1(&s->gb)) {
2164 v = get_bits(&s->gb, 8);
2165 j = s->intra_scantable.permutated[i];
2166 s->inter_matrix[j] = v;
2167 s->chroma_inter_matrix[j] = v;
2170 dprintf("non intra matrix present\n");
2172 dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2177 int j= s->dsp.idct_permutation[i];
2178 v = ff_mpeg1_default_non_intra_matrix[i];
2179 s->inter_matrix[j] = v;
2180 s->chroma_inter_matrix[j] = v;
2184 /* we set mpeg2 parameters so that it emulates mpeg1 */
2185 s->progressive_sequence = 1;
2186 s->progressive_frame = 1;
2187 s->picture_structure = PICT_FRAME;
2188 s->frame_pred_frame_dct = 1;
2190 avctx->sub_id = 1; /* indicates mpeg1 */
2194 static int vcr2_init_sequence(AVCodecContext *avctx)
2196 Mpeg1Context *s1 = avctx->priv_data;
2197 MpegEncContext *s = &s1->mpeg_enc_ctx;
2200 /* start new mpeg1 context decoding */
2201 s->out_format = FMT_MPEG1;
2202 if (s1->mpeg_enc_ctx_allocated) {
2205 s->width = avctx->width;
2206 s->height = avctx->height;
2207 avctx->has_b_frames= 0; //true?
2211 //get_format() or set_video(width,height,aspect,pix_fmt);
2212 //until then pix_fmt may be changed right after codec init
2213 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2214 avctx->idct_algo = FF_IDCT_SIMPLE;
2216 if (MPV_common_init(s) < 0)
2218 s1->mpeg_enc_ctx_allocated = 1;
2221 int j= s->dsp.idct_permutation[i];
2222 v = ff_mpeg1_default_intra_matrix[i];
2223 s->intra_matrix[j] = v;
2224 s->chroma_intra_matrix[j] = v;
2226 v = ff_mpeg1_default_non_intra_matrix[i];
2227 s->inter_matrix[j] = v;
2228 s->chroma_inter_matrix[j] = v;
2231 s->progressive_sequence = 1;
2232 s->progressive_frame = 1;
2233 s->picture_structure = PICT_FRAME;
2234 s->frame_pred_frame_dct = 1;
2236 avctx->sub_id = 2; /* indicates mpeg2 */
2241 static void mpeg_decode_user_data(AVCodecContext *avctx,
2242 const uint8_t *buf, int buf_size)
2249 /* we parse the DTG active format information */
2251 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2265 avctx->dtg_active_format = p[0] & 0x0f;
2271 * finds the end of the current frame in the bitstream.
2272 * @return the position of the first byte of the next frame, or -1
2274 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2275 ParseContext *pc= &s->parse_context;
2282 if(!pc->frame_start_found){
2283 for(i=0; i<buf_size; i++){
2284 state= (state<<8) | buf[i];
2285 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2287 pc->frame_start_found=1;
2293 if(pc->frame_start_found){
2294 for(; i<buf_size; i++){
2295 state= (state<<8) | buf[i];
2296 if((state&0xFFFFFF00) == 0x100){
2297 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2298 pc->frame_start_found=0;
2306 return END_NOT_FOUND;
2309 /* handle buffering and image synchronisation */
2310 static int mpeg_decode_frame(AVCodecContext *avctx,
2311 void *data, int *data_size,
2312 uint8_t *buf, int buf_size)
2314 Mpeg1Context *s = avctx->priv_data;
2315 uint8_t *buf_end, *buf_ptr;
2316 int ret, start_code, input_size;
2317 AVFrame *picture = data;
2318 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2319 dprintf("fill_buffer\n");
2323 /* special case for last picture */
2324 if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2325 *picture= *(AVFrame*)s2->next_picture_ptr;
2326 s2->next_picture_ptr= NULL;
2328 *data_size = sizeof(AVFrame);
2332 if(s2->flags&CODEC_FLAG_TRUNCATED){
2333 int next= mpeg1_find_frame_end(s2, buf, buf_size);
2335 if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2340 buf_end = buf + buf_size;
2343 if (s->repeat_field % 2 == 1) {
2345 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2346 // s2->picture_number, s->repeat_field);
2347 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2348 *data_size = sizeof(AVPicture);
2354 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2355 vcr2_init_sequence(avctx);
2358 /* find start next code */
2359 start_code = find_start_code(&buf_ptr, buf_end);
2360 if (start_code < 0){
2361 if (slice_end(avctx, picture)) {
2362 if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2363 *data_size = sizeof(AVPicture);
2365 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2368 input_size = buf_end - buf_ptr;
2370 if(avctx->debug & FF_DEBUG_STARTCODE){
2371 printf("%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2374 /* prepare data for next start code */
2375 switch(start_code) {
2376 case SEQ_START_CODE:
2377 mpeg1_decode_sequence(avctx, buf_ptr,
2381 case PICTURE_START_CODE:
2382 /* we have a complete image : we try to decompress it */
2383 mpeg1_decode_picture(avctx,
2384 buf_ptr, input_size);
2386 case EXT_START_CODE:
2387 mpeg_decode_extension(avctx,
2388 buf_ptr, input_size);
2390 case USER_START_CODE:
2391 mpeg_decode_user_data(avctx,
2392 buf_ptr, input_size);
2394 case GOP_START_CODE:
2398 if (start_code >= SLICE_MIN_START_CODE &&
2399 start_code <= SLICE_MAX_START_CODE) {
2401 /* skip b frames if we dont have reference frames */
2402 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2403 /* skip b frames if we are in a hurry */
2404 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2405 /* skip everything if we are in a hurry>=5 */
2406 if(avctx->hurry_up>=5) break;
2408 if (!s->mpeg_enc_ctx_allocated) break;
2410 ret = mpeg_decode_slice(avctx, picture,
2411 start_code, &buf_ptr, input_size);
2415 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2416 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);
2417 if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2419 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);
2427 static int mpeg_decode_end(AVCodecContext *avctx)
2429 Mpeg1Context *s = avctx->priv_data;
2431 if (s->mpeg_enc_ctx_allocated)
2432 MPV_common_end(&s->mpeg_enc_ctx);
2436 AVCodec mpeg_decoder = {
2439 CODEC_ID_MPEG1VIDEO,
2440 sizeof(Mpeg1Context),
2445 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2446 .flush= ff_mpeg_flush,
2450 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2453 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2455 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) )
2456 dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2458 mpeg_decode_init(avctx);
2459 s = avctx->priv_data;
2461 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2462 avctx->xvmc_acceleration = 1;
2467 AVCodec mpeg_xvmc_decoder = {
2470 CODEC_ID_MPEG2VIDEO_XVMC,
2471 sizeof(Mpeg1Context),
2472 mpeg_mc_decode_init,
2476 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,