2 * MPEG1 codec / MPEG2 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include "mpegvideo.h"
31 #include "mpeg12data.h"
38 #define SEQ_END_CODE 0x000001b7
39 #define SEQ_START_CODE 0x000001b3
40 #define GOP_START_CODE 0x000001b8
41 #define PICTURE_START_CODE 0x00000100
42 #define SLICE_MIN_START_CODE 0x00000101
43 #define SLICE_MAX_START_CODE 0x000001af
44 #define EXT_START_CODE 0x000001b5
45 #define USER_START_CODE 0x000001b2
49 #define MBINCR_VLC_BITS 9
50 #define MB_PAT_VLC_BITS 9
51 #define MB_PTYPE_VLC_BITS 6
52 #define MB_BTYPE_VLC_BITS 6
53 #define TEX_VLC_BITS 9
55 #ifdef CONFIG_ENCODERS
56 static void mpeg1_encode_block(MpegEncContext *s,
59 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
60 #endif //CONFIG_ENCODERS
61 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
64 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
67 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
68 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
71 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
74 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
75 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
76 static void exchange_uv(MpegEncContext *s);
79 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
80 extern int XVMC_field_end(MpegEncContext *s);
81 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
82 extern void XVMC_init_block(MpegEncContext *s);//set s->block
85 const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
86 const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
87 const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
88 const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
89 PIX_FMT_XVMC_MPEG2_IDCT,
90 PIX_FMT_XVMC_MPEG2_MC,
92 #ifdef CONFIG_ENCODERS
93 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
94 static uint8_t fcode_tab[MAX_MV*2+1];
96 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
97 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
99 /* simple include everything table for dc, first byte is bits number next 3 are code*/
100 static uint32_t mpeg1_lum_dc_uni[512];
101 static uint32_t mpeg1_chr_dc_uni[512];
103 static uint8_t mpeg1_index_run[2][64];
104 static int8_t mpeg1_max_level[2][64];
105 #endif //CONFIG_ENCODERS
107 static void init_2d_vlc_rl(RLTable *rl, int use_static)
111 init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
112 &rl->table_vlc[0][1], 4, 2,
113 &rl->table_vlc[0][0], 4, 2, use_static);
116 rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
118 rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120 for(i=0; i<rl->vlc.table_size; i++){
121 int code= rl->vlc.table[i][0];
122 int len = rl->vlc.table[i][1];
125 if(len==0){ // illegal code
128 }else if(len<0){ //more bits needed
132 if(code==rl->n){ //esc
135 }else if(code==rl->n+1){ //eob
139 run= rl->table_run [code] + 1;
140 level= rl->table_level[code];
143 rl->rl_vlc[0][i].len= len;
144 rl->rl_vlc[0][i].level= level;
145 rl->rl_vlc[0][i].run= run;
149 #ifdef CONFIG_ENCODERS
150 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
153 for(i=0; i<128; i++){
156 for(run=0; run<64; run++){
159 int alevel= ABS(level);
160 int sign= (level>>31)&1;
162 if (alevel > rl->max_level[0][run])
165 code= rl->index_run[0][run] + alevel - 1;
167 if (code < 111 /* rl->n */) {
168 /* store the vlc & sign at once */
169 len= mpeg1_vlc[code][1]+1;
170 bits= (mpeg1_vlc[code][0]<<1) + sign;
172 len= mpeg1_vlc[111/*rl->n*/][1]+6;
173 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
183 bits|= 0x8001 + level + 255;
185 bits|= level & 0xffff;
190 uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
191 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
197 static int find_frame_rate_index(MpegEncContext *s){
199 int64_t dmin= INT64_MAX;
203 int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->frame_rate_base;
204 int64_t n1= 1001LL*s->avctx->frame_rate;
205 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
210 s->frame_rate_index= i;
219 static int encode_init(AVCodecContext *avctx)
221 MpegEncContext *s = avctx->priv_data;
223 if(MPV_encode_init(avctx) < 0)
226 if(find_frame_rate_index(s) < 0){
227 if(s->strict_std_compliance >=0){
228 av_log(avctx, AV_LOG_ERROR, "MPEG1/2 doesnt support %d/%d fps\n", avctx->frame_rate, avctx->frame_rate_base);
231 av_log(avctx, AV_LOG_INFO, "MPEG1/2 doesnt support %d/%d fps, there may be AV sync issues\n", avctx->frame_rate, avctx->frame_rate_base);
238 static void put_header(MpegEncContext *s, int header)
240 align_put_bits(&s->pb);
241 put_bits(&s->pb, 16, header>>16);
242 put_bits(&s->pb, 16, header&0xFFFF);
245 /* put sequence header if needed */
246 static void mpeg1_encode_sequence_header(MpegEncContext *s)
248 unsigned int vbv_buffer_size;
252 float best_aspect_error= 1E10;
253 float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
254 int constraint_parameter_flag;
256 if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
258 if (s->current_picture.key_frame) {
259 AVRational framerate= frame_rate_tab[s->frame_rate_index];
261 /* mpeg1 header repeated every gop */
262 put_header(s, SEQ_START_CODE);
264 put_bits(&s->pb, 12, s->width);
265 put_bits(&s->pb, 12, s->height);
268 float error= aspect_ratio;
269 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
270 error-= 1.0/mpeg1_aspect[i];
272 error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
276 if(error < best_aspect_error){
277 best_aspect_error= error;
278 s->aspect_ratio_info= i;
282 put_bits(&s->pb, 4, s->aspect_ratio_info);
283 put_bits(&s->pb, 4, s->frame_rate_index);
285 if(s->avctx->rc_max_rate){
286 v = (s->avctx->rc_max_rate + 399) / 400;
287 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
293 if(s->avctx->rc_buffer_size)
294 vbv_buffer_size = s->avctx->rc_buffer_size;
296 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
297 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
298 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
300 put_bits(&s->pb, 18, v & 0x3FFFF);
301 put_bits(&s->pb, 1, 1); /* marker */
302 put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
304 constraint_parameter_flag=
305 s->width <= 768 && s->height <= 576 &&
306 s->mb_width * s->mb_height <= 396 &&
307 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
308 framerate.num <= framerate.den*30 &&
309 s->avctx->me_range && s->avctx->me_range < 128 &&
310 vbv_buffer_size <= 20 &&
312 s->codec_id == CODEC_ID_MPEG1VIDEO;
314 put_bits(&s->pb, 1, constraint_parameter_flag);
316 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
317 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
319 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
320 put_header(s, EXT_START_CODE);
321 put_bits(&s->pb, 4, 1); //seq ext
322 put_bits(&s->pb, 1, 0); //esc
324 if(s->avctx->profile == FF_PROFILE_UNKNOWN){
325 put_bits(&s->pb, 3, 4); //profile
327 put_bits(&s->pb, 3, s->avctx->profile); //profile
330 if(s->avctx->level == FF_LEVEL_UNKNOWN){
331 put_bits(&s->pb, 4, 8); //level
333 put_bits(&s->pb, 4, s->avctx->level); //level
336 put_bits(&s->pb, 1, s->progressive_sequence);
337 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
338 put_bits(&s->pb, 2, 0); //horizontal size ext
339 put_bits(&s->pb, 2, 0); //vertical size ext
340 put_bits(&s->pb, 12, v>>18); //bitrate ext
341 put_bits(&s->pb, 1, 1); //marker
342 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
343 put_bits(&s->pb, 1, s->low_delay);
344 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
345 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
348 put_header(s, GOP_START_CODE);
349 put_bits(&s->pb, 1, 0); /* do drop frame */
350 /* time code : we must convert from the real frame rate to a
351 fake mpeg frame rate in case of low frame rate */
352 fps = (framerate.num + framerate.den/2)/ framerate.den;
353 time_code = s->current_picture_ptr->coded_picture_number;
355 s->gop_picture_number = time_code;
356 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
357 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
358 put_bits(&s->pb, 1, 1);
359 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
360 put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
361 put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
362 put_bits(&s->pb, 1, 0); /* broken link */
366 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
368 put_bits(&s->pb, 11, 0x008);
371 put_bits(&s->pb, mbAddrIncrTable[run][1],
372 mbAddrIncrTable[run][0]);
374 #endif //CONFIG_ENCODERS
376 static void common_init(MpegEncContext *s)
380 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
384 void ff_mpeg1_clean_buffers(MpegEncContext *s){
385 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
386 s->last_dc[1] = s->last_dc[0];
387 s->last_dc[2] = s->last_dc[0];
388 memset(s->last_mv, 0, sizeof(s->last_mv));
391 #ifdef CONFIG_ENCODERS
393 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
394 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
395 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
396 put_bits(&s->pb, 1, 0); /* slice extra information */
399 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
401 mpeg1_encode_sequence_header(s);
403 /* mpeg1 picture header */
404 put_header(s, PICTURE_START_CODE);
405 /* temporal reference */
407 // RAL: s->picture_number instead of s->fake_picture_number
408 put_bits(&s->pb, 10, (s->picture_number -
409 s->gop_picture_number) & 0x3ff);
410 put_bits(&s->pb, 3, s->pict_type);
412 s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
413 put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
415 // RAL: Forward f_code also needed for B frames
416 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
417 put_bits(&s->pb, 1, 0); /* half pel coordinates */
418 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
419 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
421 put_bits(&s->pb, 3, 7); /* forward_f_code */
424 // RAL: Backward f_code necessary for B frames
425 if (s->pict_type == B_TYPE) {
426 put_bits(&s->pb, 1, 0); /* half pel coordinates */
427 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
428 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
430 put_bits(&s->pb, 3, 7); /* backward_f_code */
433 put_bits(&s->pb, 1, 0); /* extra bit picture */
435 s->frame_pred_frame_dct = 1;
436 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
437 put_header(s, EXT_START_CODE);
438 put_bits(&s->pb, 4, 8); //pic ext
439 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
440 put_bits(&s->pb, 4, s->f_code);
441 put_bits(&s->pb, 4, s->f_code);
443 put_bits(&s->pb, 8, 255);
445 if (s->pict_type == B_TYPE) {
446 put_bits(&s->pb, 4, s->b_code);
447 put_bits(&s->pb, 4, s->b_code);
449 put_bits(&s->pb, 8, 255);
451 put_bits(&s->pb, 2, s->intra_dc_precision);
453 assert(s->picture_structure == PICT_FRAME);
454 put_bits(&s->pb, 2, s->picture_structure);
455 if (s->progressive_sequence) {
456 put_bits(&s->pb, 1, 0); /* no repeat */
458 put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
460 /* XXX: optimize the generation of this flag with entropy
462 s->frame_pred_frame_dct = s->progressive_sequence;
464 put_bits(&s->pb, 1, s->frame_pred_frame_dct);
465 put_bits(&s->pb, 1, s->concealment_motion_vectors);
466 put_bits(&s->pb, 1, s->q_scale_type);
467 put_bits(&s->pb, 1, s->intra_vlc_format);
468 put_bits(&s->pb, 1, s->alternate_scan);
469 put_bits(&s->pb, 1, s->repeat_first_field);
470 put_bits(&s->pb, 1, s->chroma_420_type=1);
471 s->progressive_frame = s->progressive_sequence;
472 put_bits(&s->pb, 1, s->progressive_frame);
473 put_bits(&s->pb, 1, 0); //composite_display_flag
475 if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
478 put_header(s, USER_START_CODE);
479 for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
480 put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
485 ff_mpeg1_encode_slice_header(s);
488 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
489 int has_mv, int field_motion)
491 put_bits(&s->pb, n, bits);
492 if (!s->frame_pred_frame_dct) {
494 put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
495 put_bits(&s->pb, 1, s->interlaced_dct);
499 void mpeg1_encode_mb(MpegEncContext *s,
500 DCTELEM block[6][64],
501 int motion_x, int motion_y)
504 const int mb_x = s->mb_x;
505 const int mb_y = s->mb_y;
506 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
511 if (s->block_last_index[i] >= 0)
515 if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
516 (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
517 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
518 (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) |
519 ((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))) {
521 s->qscale -= s->dquant;
525 if(s->pict_type == P_TYPE){
526 s->last_mv[0][1][0]= s->last_mv[0][0][0]=
527 s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
531 assert(s->mb_skip_run == 0);
532 encode_mb_skip_run(s, s->mb_x);
534 encode_mb_skip_run(s, s->mb_skip_run);
537 if (s->pict_type == I_TYPE) {
538 if(s->dquant && cbp){
539 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
540 put_bits(&s->pb, 5, s->qscale);
542 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
543 s->qscale -= s->dquant;
545 s->misc_bits+= get_bits_diff(s);
547 } else if (s->mb_intra) {
548 if(s->dquant && cbp){
549 put_mb_modes(s, 6, 0x01, 0, 0);
550 put_bits(&s->pb, 5, s->qscale);
552 put_mb_modes(s, 5, 0x03, 0, 0);
553 s->qscale -= s->dquant;
555 s->misc_bits+= get_bits_diff(s);
557 memset(s->last_mv, 0, sizeof(s->last_mv));
558 } else if (s->pict_type == P_TYPE) {
559 if(s->mv_type == MV_TYPE_16X16){
561 if ((motion_x|motion_y) == 0) {
563 put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
564 put_bits(&s->pb, 5, s->qscale);
566 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
568 s->misc_bits+= get_bits_diff(s);
571 put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
572 put_bits(&s->pb, 5, s->qscale);
574 put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
576 s->misc_bits+= get_bits_diff(s);
577 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
578 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
579 s->mv_bits+= get_bits_diff(s);
582 put_bits(&s->pb, 3, 1); /* motion only */
583 if (!s->frame_pred_frame_dct)
584 put_bits(&s->pb, 2, 2); /* motion_type: frame */
585 s->misc_bits+= get_bits_diff(s);
586 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
587 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
588 s->qscale -= s->dquant;
589 s->mv_bits+= get_bits_diff(s);
591 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
592 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
594 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
598 put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
599 put_bits(&s->pb, 5, s->qscale);
601 put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
604 put_bits(&s->pb, 3, 1); /* motion only */
605 put_bits(&s->pb, 2, 1); /* motion_type: field */
606 s->qscale -= s->dquant;
608 s->misc_bits+= get_bits_diff(s);
610 put_bits(&s->pb, 1, s->field_select[0][i]);
611 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
612 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
613 s->last_mv[0][i][0]= s->mv[0][i][0];
614 s->last_mv[0][i][1]= 2*s->mv[0][i][1];
616 s->mv_bits+= get_bits_diff(s);
619 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
622 static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
624 if(s->mv_type == MV_TYPE_16X16){
625 if (cbp){ // With coded bloc pattern
627 if(s->mv_dir == MV_DIR_FORWARD)
628 put_mb_modes(s, 6, 3, 1, 0);
630 put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
631 put_bits(&s->pb, 5, s->qscale);
633 put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
635 }else{ // No coded bloc pattern
636 put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
637 if (!s->frame_pred_frame_dct)
638 put_bits(&s->pb, 2, 2); /* motion_type: frame */
639 s->qscale -= s->dquant;
641 s->misc_bits += get_bits_diff(s);
642 if (s->mv_dir&MV_DIR_FORWARD){
643 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
644 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
645 s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
646 s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
649 if (s->mv_dir&MV_DIR_BACKWARD){
650 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
651 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
652 s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
653 s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
657 assert(s->mv_type == MV_TYPE_FIELD);
658 assert(!s->frame_pred_frame_dct);
659 if (cbp){ // With coded bloc pattern
661 if(s->mv_dir == MV_DIR_FORWARD)
662 put_mb_modes(s, 6, 3, 1, 1);
664 put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
665 put_bits(&s->pb, 5, s->qscale);
667 put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
669 }else{ // No coded bloc pattern
670 put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
671 put_bits(&s->pb, 2, 1); /* motion_type: field */
672 s->qscale -= s->dquant;
674 s->misc_bits += get_bits_diff(s);
675 if (s->mv_dir&MV_DIR_FORWARD){
677 put_bits(&s->pb, 1, s->field_select[0][i]);
678 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
679 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
680 s->last_mv[0][i][0]= s->mv[0][i][0];
681 s->last_mv[0][i][1]= 2*s->mv[0][i][1];
685 if (s->mv_dir&MV_DIR_BACKWARD){
687 put_bits(&s->pb, 1, s->field_select[1][i]);
688 mpeg1_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code);
689 mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
690 s->last_mv[1][i][0]= s->mv[1][i][0];
691 s->last_mv[1][i][1]= 2*s->mv[1][i][1];
696 s->mv_bits += get_bits_diff(s);
698 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
701 if (cbp & (1 << (5 - i))) {
702 mpeg1_encode_block(s, block[i], i);
707 s->i_tex_bits+= get_bits_diff(s);
709 s->p_tex_bits+= get_bits_diff(s);
713 // RAL: Parameter added: f_or_b_code
714 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
716 int code, bit_size, l, bits, range, sign;
722 mbMotionVectorTable[0][1],
723 mbMotionVectorTable[0][0]);
725 bit_size = f_or_b_code - 1;
726 range = 1 << bit_size;
727 /* modulo encoding */
728 l= INT_BIT - 5 - bit_size;
733 code = (val >> bit_size) + 1;
734 bits = val & (range - 1);
739 code = (val >> bit_size) + 1;
740 bits = val & (range - 1);
744 assert(code > 0 && code <= 16);
747 mbMotionVectorTable[code][1],
748 mbMotionVectorTable[code][0]);
750 put_bits(&s->pb, 1, sign);
752 put_bits(&s->pb, bit_size, bits);
757 void ff_mpeg1_encode_init(MpegEncContext *s)
769 init_rl(&rl_mpeg1, 1);
773 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
774 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
777 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
779 /* build unified dc encoding tables */
780 for(i=-255; i<256; i++)
788 index = av_log2(2*adiff);
790 bits= vlc_dc_lum_bits[index] + index;
791 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
792 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
794 bits= vlc_dc_chroma_bits[index] + index;
795 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
796 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
799 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
801 for(f_code=1; f_code<=MAX_FCODE; f_code++){
802 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
805 if(mv==0) len= mbMotionVectorTable[0][1];
807 int val, bit_size, range, code;
809 bit_size = f_code - 1;
810 range = 1 << bit_size;
816 code = (val >> bit_size) + 1;
818 len= mbMotionVectorTable[code][1] + 1 + bit_size;
820 len= mbMotionVectorTable[16][1] + 2 + bit_size;
824 mv_penalty[f_code][mv+MAX_MV]= len;
829 for(f_code=MAX_FCODE; f_code>0; f_code--){
830 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
831 fcode_tab[mv+MAX_MV]= f_code;
835 s->me.mv_penalty= mv_penalty;
836 s->fcode_tab= fcode_tab;
837 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
844 s->intra_ac_vlc_length=
845 s->inter_ac_vlc_length=
846 s->intra_ac_vlc_last_length=
847 s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
850 static inline void encode_dc(MpegEncContext *s, int diff, int component)
852 if(((unsigned) (diff+255)) >= 511){
856 index= av_log2_16bit(-2*diff);
859 index= av_log2_16bit(2*diff);
861 if (component == 0) {
864 vlc_dc_lum_bits[index] + index,
865 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
869 vlc_dc_chroma_bits[index] + index,
870 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
873 if (component == 0) {
876 mpeg1_lum_dc_uni[diff+255]&0xFF,
877 mpeg1_lum_dc_uni[diff+255]>>8);
881 mpeg1_chr_dc_uni[diff+255]&0xFF,
882 mpeg1_chr_dc_uni[diff+255]>>8);
887 static void mpeg1_encode_block(MpegEncContext *s,
891 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
893 // RLTable *rl = &rl_mpeg1;
895 last_index = s->block_last_index[n];
899 component = (n <= 3 ? 0 : n - 4 + 1);
900 dc = block[0]; /* overflow is impossible */
901 diff = dc - s->last_dc[component];
902 encode_dc(s, diff, component);
903 s->last_dc[component] = dc;
906 if (s->intra_vlc_format)
912 /* encode the first coefficient : needs to be done here because
913 it is handled slightly differently */
915 if (abs(level) == 1) {
916 code = ((uint32_t)level >> 31); /* the sign bit */
917 put_bits(&s->pb, 2, code | 0x02);
926 /* now quantify & encode AC coefs */
927 last_non_zero = i - 1;
929 for(;i<=last_index;i++) {
930 j = s->intra_scantable.permutated[i];
935 dprintf("level[%d]=%d\n", i, level);
937 /* encode using VLC */
939 run = i - last_non_zero - 1;
942 MASK_ABS(sign, alevel)
945 // code = get_rl_index(rl, 0, run, alevel);
946 if (alevel <= mpeg1_max_level[0][run]){
947 code= mpeg1_index_run[0][run] + alevel - 1;
948 /* store the vlc & sign at once */
949 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
951 /* escape seems to be pretty rare <5% so i dont optimize it */
952 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
953 /* escape: only clip in this case */
954 put_bits(&s->pb, 6, run);
955 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
957 put_bits(&s->pb, 8, level & 0xff);
960 put_bits(&s->pb, 16, 0x8001 + level + 255);
962 put_bits(&s->pb, 16, level & 0xffff);
966 put_bits(&s->pb, 12, level & 0xfff);
973 put_bits(&s->pb, 2, 0x2);
975 #endif //CONFIG_ENCODERS
977 /******************************************/
980 static VLC dc_lum_vlc;
981 static VLC dc_chroma_vlc;
983 static VLC mbincr_vlc;
984 static VLC mb_ptype_vlc;
985 static VLC mb_btype_vlc;
986 static VLC mb_pat_vlc;
988 static void init_vlcs(void)
995 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
996 vlc_dc_lum_bits, 1, 1,
997 vlc_dc_lum_code, 2, 2, 1);
998 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
999 vlc_dc_chroma_bits, 1, 1,
1000 vlc_dc_chroma_code, 2, 2, 1);
1001 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1002 &mbMotionVectorTable[0][1], 2, 1,
1003 &mbMotionVectorTable[0][0], 2, 1, 1);
1004 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1005 &mbAddrIncrTable[0][1], 2, 1,
1006 &mbAddrIncrTable[0][0], 2, 1, 1);
1007 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1008 &mbPatTable[0][1], 2, 1,
1009 &mbPatTable[0][0], 2, 1, 1);
1011 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1012 &table_mb_ptype[0][1], 2, 1,
1013 &table_mb_ptype[0][0], 2, 1, 1);
1014 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1015 &table_mb_btype[0][1], 2, 1,
1016 &table_mb_btype[0][0], 2, 1, 1);
1017 init_rl(&rl_mpeg1, 1);
1018 init_rl(&rl_mpeg2, 1);
1020 init_2d_vlc_rl(&rl_mpeg1, 1);
1021 init_2d_vlc_rl(&rl_mpeg2, 1);
1025 static inline int get_dmv(MpegEncContext *s)
1027 if(get_bits1(&s->gb))
1028 return 1 - (get_bits1(&s->gb) << 1);
1033 static inline int get_qscale(MpegEncContext *s)
1035 int qscale = get_bits(&s->gb, 5);
1036 if (s->q_scale_type) {
1037 return non_linear_qscale[qscale];
1043 /* motion type (for mpeg2) */
1049 static int mpeg_decode_mb(MpegEncContext *s,
1050 DCTELEM block[12][64])
1052 int i, j, k, cbp, val, mb_type, motion_type;
1053 const int mb_block_count = 4 + (1<< s->chroma_format);
1055 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1057 assert(s->mb_skiped==0);
1059 if (s->mb_skip_run-- != 0) {
1060 if(s->pict_type == I_TYPE){
1061 av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1068 s->block_last_index[i] = -1;
1069 if(s->picture_structure == PICT_FRAME)
1070 s->mv_type = MV_TYPE_16X16;
1072 s->mv_type = MV_TYPE_FIELD;
1073 if (s->pict_type == P_TYPE) {
1074 /* if P type, zero motion vector is implied */
1075 s->mv_dir = MV_DIR_FORWARD;
1076 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1077 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1078 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1079 s->field_select[0][0]= s->picture_structure - 1;
1081 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1086 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1088 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
1089 if(IS_INTRA(mb_type))
1092 /* if B type, reuse previous vectors and directions */
1093 s->mv[0][0][0] = s->last_mv[0][0][0];
1094 s->mv[0][0][1] = s->last_mv[0][0][1];
1095 s->mv[1][0][0] = s->last_mv[1][0][0];
1096 s->mv[1][0][1] = s->last_mv[1][0][1];
1098 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1099 mb_type | MB_TYPE_SKIP;
1100 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1102 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1109 switch(s->pict_type) {
1112 if (get_bits1(&s->gb) == 0) {
1113 if (get_bits1(&s->gb) == 0){
1114 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1117 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1119 mb_type = MB_TYPE_INTRA;
1123 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1125 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1128 mb_type = ptype2mb_type[ mb_type ];
1131 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1133 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1136 mb_type = btype2mb_type[ mb_type ];
1139 dprintf("mb_type=%x\n", mb_type);
1140 // motion_type = 0; /* avoid warning */
1141 if (IS_INTRA(mb_type)) {
1142 /* compute dct type */
1143 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1144 !s->frame_pred_frame_dct) {
1145 s->interlaced_dct = get_bits1(&s->gb);
1148 if (IS_QUANT(mb_type))
1149 s->qscale = get_qscale(s);
1151 if (s->concealment_motion_vectors) {
1152 /* just parse them */
1153 if (s->picture_structure != PICT_FRAME)
1154 skip_bits1(&s->gb); /* field select */
1156 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1157 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1158 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1159 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1161 skip_bits1(&s->gb); /* marker */
1163 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1166 //one 1 we memcpy blocks in xvmcvideo
1167 if(s->avctx->xvmc_acceleration > 1){
1168 XVMC_pack_pblocks(s,-1);//inter are always full blocks
1175 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1176 for(i=0;i<mb_block_count;i++) {
1177 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1182 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1187 if (mb_type & MB_TYPE_ZERO_MV){
1188 assert(mb_type & MB_TYPE_CBP);
1190 /* compute dct type */
1191 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1192 !s->frame_pred_frame_dct) {
1193 s->interlaced_dct = get_bits1(&s->gb);
1196 if (IS_QUANT(mb_type))
1197 s->qscale = get_qscale(s);
1199 s->mv_dir = MV_DIR_FORWARD;
1200 if(s->picture_structure == PICT_FRAME)
1201 s->mv_type = MV_TYPE_16X16;
1203 s->mv_type = MV_TYPE_FIELD;
1204 mb_type |= MB_TYPE_INTERLACED;
1205 s->field_select[0][0]= s->picture_structure - 1;
1207 s->last_mv[0][0][0] = 0;
1208 s->last_mv[0][0][1] = 0;
1209 s->last_mv[0][1][0] = 0;
1210 s->last_mv[0][1][1] = 0;
1214 assert(mb_type & MB_TYPE_L0L1);
1215 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1216 /* get additionnal motion vector type */
1217 if (s->frame_pred_frame_dct)
1218 motion_type = MT_FRAME;
1220 motion_type = get_bits(&s->gb, 2);
1223 /* compute dct type */
1224 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1225 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1226 s->interlaced_dct = get_bits1(&s->gb);
1229 if (IS_QUANT(mb_type))
1230 s->qscale = get_qscale(s);
1232 /* motion vectors */
1235 if (USES_LIST(mb_type, i)) {
1236 s->mv_dir |= (MV_DIR_FORWARD >> i);
1237 dprintf("motion_type=%d\n", motion_type);
1238 switch(motion_type) {
1239 case MT_FRAME: /* or MT_16X8 */
1240 if (s->picture_structure == PICT_FRAME) {
1242 mb_type |= MB_TYPE_16x16;
1243 s->mv_type = MV_TYPE_16X16;
1244 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1245 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1246 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1247 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1248 /* full_pel: only for mpeg1 */
1249 if (s->full_pel[i]){
1250 s->mv[i][0][0] <<= 1;
1251 s->mv[i][0][1] <<= 1;
1255 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1256 s->mv_type = MV_TYPE_16X8;
1258 s->field_select[i][j] = get_bits1(&s->gb);
1260 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1261 s->last_mv[i][j][k]);
1262 s->last_mv[i][j][k] = val;
1263 s->mv[i][j][k] = val;
1269 s->mv_type = MV_TYPE_FIELD;
1270 if (s->picture_structure == PICT_FRAME) {
1271 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1273 s->field_select[i][j] = get_bits1(&s->gb);
1274 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1275 s->last_mv[i][j][0]);
1276 s->last_mv[i][j][0] = val;
1277 s->mv[i][j][0] = val;
1278 dprintf("fmx=%d\n", val);
1279 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1280 s->last_mv[i][j][1] >> 1);
1281 s->last_mv[i][j][1] = val << 1;
1282 s->mv[i][j][1] = val;
1283 dprintf("fmy=%d\n", val);
1286 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1287 s->field_select[i][0] = get_bits1(&s->gb);
1289 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1290 s->last_mv[i][0][k]);
1291 s->last_mv[i][0][k] = val;
1292 s->last_mv[i][1][k] = val;
1293 s->mv[i][0][k] = val;
1299 int dmx, dmy, mx, my, m;
1301 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1302 s->last_mv[i][0][0]);
1303 s->last_mv[i][0][0] = mx;
1304 s->last_mv[i][1][0] = mx;
1306 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1307 s->last_mv[i][0][1] >> 1);
1309 s->mv_type = MV_TYPE_DMV;
1312 s->last_mv[i][0][1] = my<<1;
1313 s->last_mv[i][1][1] = my<<1;
1315 s->mv[i][0][0] = mx;
1316 s->mv[i][0][1] = my;
1317 s->mv[i][1][0] = mx;//not used
1318 s->mv[i][1][1] = my;//not used
1320 if (s->picture_structure == PICT_FRAME) {
1321 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1323 //m = 1 + 2 * s->top_field_first;
1324 m = s->top_field_first ? 1 : 3;
1326 /* top -> top pred */
1327 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1328 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1330 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1331 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1333 mb_type |= MB_TYPE_16x16;
1335 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1336 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1337 if(s->picture_structure == PICT_TOP_FIELD)
1345 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1354 if (HAS_CBP(mb_type)) {
1355 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1356 if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1357 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1360 if(mb_block_count > 6){
1361 cbp<<= mb_block_count-6;
1362 cbp |= get_bits(&s->gb, mb_block_count-6);
1366 //on 1 we memcpy blocks in xvmcvideo
1367 if(s->avctx->xvmc_acceleration > 1){
1368 XVMC_pack_pblocks(s,cbp);
1375 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1376 if(s->flags2 & CODEC_FLAG2_FAST){
1379 mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1381 s->block_last_index[i] = -1;
1386 cbp<<= 12-mb_block_count;
1388 for(i=0;i<mb_block_count;i++) {
1389 if ( cbp & (1<<11) ) {
1390 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1393 s->block_last_index[i] = -1;
1399 if(s->flags2 & CODEC_FLAG2_FAST){
1402 mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1404 s->block_last_index[i] = -1;
1411 if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1414 s->block_last_index[i] = -1;
1422 s->block_last_index[i] = -1;
1426 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1431 /* as h263, but only 17 codes */
1432 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1434 int code, sign, val, l, shift;
1436 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1444 sign = get_bits1(&s->gb);
1448 val = (val - 1) << shift;
1449 val |= get_bits(&s->gb, shift);
1456 /* modulo decoding */
1457 l= INT_BIT - 5 - shift;
1462 static inline int decode_dc(GetBitContext *gb, int component)
1466 if (component == 0) {
1467 code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1469 code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1472 av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1478 diff = get_xbits(gb, code);
1483 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1487 int level, dc, diff, i, j, run;
1489 RLTable *rl = &rl_mpeg1;
1490 uint8_t * const scantable= s->intra_scantable.permutated;
1491 const uint16_t *quant_matrix= s->intra_matrix;
1492 const int qscale= s->qscale;
1495 component = (n <= 3 ? 0 : n - 4 + 1);
1496 diff = decode_dc(&s->gb, component);
1499 dc = s->last_dc[component];
1501 s->last_dc[component] = dc;
1503 dprintf("dc=%d diff=%d\n", dc, diff);
1506 OPEN_READER(re, &s->gb);
1507 /* now quantify & encode AC coefs */
1509 UPDATE_CACHE(re, &s->gb);
1510 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1514 } else if(level != 0) {
1517 level= (level*qscale*quant_matrix[j])>>4;
1519 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1520 LAST_SKIP_BITS(re, &s->gb, 1);
1523 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1524 UPDATE_CACHE(re, &s->gb);
1525 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1526 if (level == -128) {
1527 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1528 } else if (level == 0) {
1529 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1535 level= (level*qscale*quant_matrix[j])>>4;
1539 level= (level*qscale*quant_matrix[j])>>4;
1544 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1550 CLOSE_READER(re, &s->gb);
1552 s->block_last_index[n] = i;
1556 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1560 int level, i, j, run;
1561 RLTable *rl = &rl_mpeg1;
1562 uint8_t * const scantable= s->intra_scantable.permutated;
1563 const uint16_t *quant_matrix= s->inter_matrix;
1564 const int qscale= s->qscale;
1567 OPEN_READER(re, &s->gb);
1569 /* special case for the first coef. no need to add a second vlc table */
1570 UPDATE_CACHE(re, &s->gb);
1571 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1572 level= (3*qscale*quant_matrix[0])>>5;
1574 if(GET_CACHE(re, &s->gb)&0x40000000)
1578 SKIP_BITS(re, &s->gb, 2);
1579 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1583 /* now quantify & encode AC coefs */
1585 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1590 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1592 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1593 SKIP_BITS(re, &s->gb, 1);
1596 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1597 UPDATE_CACHE(re, &s->gb);
1598 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1599 if (level == -128) {
1600 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1601 } else if (level == 0) {
1602 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
1608 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1612 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1617 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1622 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1624 UPDATE_CACHE(re, &s->gb);
1627 LAST_SKIP_BITS(re, &s->gb, 2);
1628 CLOSE_READER(re, &s->gb);
1630 s->block_last_index[n] = i;
1634 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1636 int level, i, j, run;
1637 RLTable *rl = &rl_mpeg1;
1638 uint8_t * const scantable= s->intra_scantable.permutated;
1639 const int qscale= s->qscale;
1642 OPEN_READER(re, &s->gb);
1644 /* special case for the first coef. no need to add a second vlc table */
1645 UPDATE_CACHE(re, &s->gb);
1646 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1647 level= (3*qscale)>>1;
1649 if(GET_CACHE(re, &s->gb)&0x40000000)
1653 SKIP_BITS(re, &s->gb, 2);
1654 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1658 /* now quantify & encode AC coefs */
1660 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1665 level= ((level*2+1)*qscale)>>1;
1667 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1668 SKIP_BITS(re, &s->gb, 1);
1671 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1672 UPDATE_CACHE(re, &s->gb);
1673 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1674 if (level == -128) {
1675 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1676 } else if (level == 0) {
1677 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
1683 level= ((level*2+1)*qscale)>>1;
1687 level= ((level*2+1)*qscale)>>1;
1693 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1695 UPDATE_CACHE(re, &s->gb);
1698 LAST_SKIP_BITS(re, &s->gb, 2);
1699 CLOSE_READER(re, &s->gb);
1701 s->block_last_index[n] = i;
1706 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1710 int level, i, j, run;
1711 RLTable *rl = &rl_mpeg1;
1712 uint8_t * const scantable= s->intra_scantable.permutated;
1713 const uint16_t *quant_matrix;
1714 const int qscale= s->qscale;
1720 OPEN_READER(re, &s->gb);
1723 quant_matrix = s->inter_matrix;
1725 quant_matrix = s->chroma_inter_matrix;
1727 /* special case for the first coef. no need to add a second vlc table */
1728 UPDATE_CACHE(re, &s->gb);
1729 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1730 level= (3*qscale*quant_matrix[0])>>5;
1731 if(GET_CACHE(re, &s->gb)&0x40000000)
1736 SKIP_BITS(re, &s->gb, 2);
1737 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1741 /* now quantify & encode AC coefs */
1743 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1748 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1749 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1750 SKIP_BITS(re, &s->gb, 1);
1753 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1754 UPDATE_CACHE(re, &s->gb);
1755 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1760 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1763 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1767 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1773 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1775 UPDATE_CACHE(re, &s->gb);
1778 LAST_SKIP_BITS(re, &s->gb, 2);
1779 CLOSE_READER(re, &s->gb);
1781 block[63] ^= (mismatch & 1);
1783 s->block_last_index[n] = i;
1787 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1791 int level, i, j, run;
1792 RLTable *rl = &rl_mpeg1;
1793 uint8_t * const scantable= s->intra_scantable.permutated;
1794 const int qscale= s->qscale;
1796 OPEN_READER(re, &s->gb);
1799 /* special case for the first coef. no need to add a second vlc table */
1800 UPDATE_CACHE(re, &s->gb);
1801 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1802 level= (3*qscale)>>1;
1803 if(GET_CACHE(re, &s->gb)&0x40000000)
1807 SKIP_BITS(re, &s->gb, 2);
1808 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1812 /* now quantify & encode AC coefs */
1814 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1819 level= ((level*2+1)*qscale)>>1;
1820 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1821 SKIP_BITS(re, &s->gb, 1);
1824 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1825 UPDATE_CACHE(re, &s->gb);
1826 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1831 level= ((-level*2+1)*qscale)>>1;
1834 level= ((level*2+1)*qscale)>>1;
1839 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1841 UPDATE_CACHE(re, &s->gb);
1844 LAST_SKIP_BITS(re, &s->gb, 2);
1845 CLOSE_READER(re, &s->gb);
1846 s->block_last_index[n] = i;
1851 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1855 int level, dc, diff, i, j, run;
1858 uint8_t * const scantable= s->intra_scantable.permutated;
1859 const uint16_t *quant_matrix;
1860 const int qscale= s->qscale;
1865 quant_matrix = s->intra_matrix;
1868 quant_matrix = s->chroma_intra_matrix;
1869 component = (n&1) + 1;
1871 diff = decode_dc(&s->gb, component);
1874 dc = s->last_dc[component];
1876 s->last_dc[component] = dc;
1877 block[0] = dc << (3 - s->intra_dc_precision);
1878 dprintf("dc=%d\n", block[0]);
1879 mismatch = block[0] ^ 1;
1881 if (s->intra_vlc_format)
1887 OPEN_READER(re, &s->gb);
1888 /* now quantify & encode AC coefs */
1890 UPDATE_CACHE(re, &s->gb);
1891 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1895 } else if(level != 0) {
1898 level= (level*qscale*quant_matrix[j])>>4;
1899 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1900 LAST_SKIP_BITS(re, &s->gb, 1);
1903 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1904 UPDATE_CACHE(re, &s->gb);
1905 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1909 level= (-level*qscale*quant_matrix[j])>>4;
1912 level= (level*qscale*quant_matrix[j])>>4;
1916 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1923 CLOSE_READER(re, &s->gb);
1925 block[63]^= mismatch&1;
1927 s->block_last_index[n] = i;
1931 typedef struct Mpeg1Context {
1932 MpegEncContext mpeg_enc_ctx;
1933 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1934 int repeat_field; /* true if we must repeat the field */
1935 AVPanScan pan_scan; /** some temporary storage for the panscan */
1937 int swap_uv;//indicate VCR2
1938 int save_aspect_info;
1939 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1943 static int mpeg_decode_init(AVCodecContext *avctx)
1945 Mpeg1Context *s = avctx->priv_data;
1946 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1949 //we need some parmutation to store
1950 //matrixes, until MPV_common_init()
1951 //set the real permutatuon
1953 s2->dsp.idct_permutation[i]=i;
1955 MPV_decode_defaults(s2);
1957 s->mpeg_enc_ctx.avctx= avctx;
1958 s->mpeg_enc_ctx.flags= avctx->flags;
1959 s->mpeg_enc_ctx.flags2= avctx->flags2;
1960 common_init(&s->mpeg_enc_ctx);
1963 s->mpeg_enc_ctx_allocated = 0;
1964 s->mpeg_enc_ctx.picture_number = 0;
1965 s->repeat_field = 0;
1966 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1970 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1971 const uint8_t *new_perm){
1972 uint16_t temp_matrix[64];
1975 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1978 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1982 //Call this function when we know all parameters
1983 //it may be called in different places for mpeg1 and mpeg2
1984 static int mpeg_decode_postinit(AVCodecContext *avctx){
1985 Mpeg1Context *s1 = avctx->priv_data;
1986 MpegEncContext *s = &s1->mpeg_enc_ctx;
1987 uint8_t old_permutation[64];
1990 (s1->mpeg_enc_ctx_allocated == 0)||
1991 avctx->coded_width != s->width ||
1992 avctx->coded_height != s->height||
1993 s1->save_aspect_info != s->aspect_ratio_info||
1997 if (s1->mpeg_enc_ctx_allocated) {
2001 if( (s->width == 0 )||(s->height == 0))
2004 avcodec_set_dimensions(avctx, s->width, s->height);
2005 avctx->bit_rate = s->bit_rate;
2006 s1->save_aspect_info = s->aspect_ratio_info;
2008 //low_delay may be forced, in this case we will have B frames
2009 //that behave like P frames
2010 avctx->has_b_frames = !(s->low_delay);
2012 if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2014 avctx->frame_rate = frame_rate_tab[s->frame_rate_index].num;
2015 avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
2017 avctx->sample_aspect_ratio= av_d2q(
2018 1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2023 &s->avctx->frame_rate,
2024 &s->avctx->frame_rate_base,
2025 frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2026 frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2029 if(s->aspect_ratio_info > 1){
2030 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2031 s->avctx->sample_aspect_ratio=
2033 mpeg2_aspect[s->aspect_ratio_info],
2034 (AVRational){s->width, s->height}
2037 s->avctx->sample_aspect_ratio=
2039 mpeg2_aspect[s->aspect_ratio_info],
2040 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2044 s->avctx->sample_aspect_ratio=
2045 mpeg2_aspect[s->aspect_ratio_info];
2049 if(avctx->xvmc_acceleration){
2050 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2052 if(s->chroma_format < 2){
2053 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2055 if(s->chroma_format == 2){
2056 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2058 if(s->chroma_format > 2){
2059 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2062 //until then pix_fmt may be changed right after codec init
2063 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2064 if( avctx->idct_algo == FF_IDCT_AUTO )
2065 avctx->idct_algo = FF_IDCT_SIMPLE;
2067 //quantization matrixes may need reordering
2068 //if dct permutation is changed
2069 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2071 if (MPV_common_init(s) < 0)
2074 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
2075 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
2076 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2077 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2079 s1->mpeg_enc_ctx_allocated = 1;
2084 /* return the 8 bit start code value and update the search
2085 state. Return -1 if no start code found */
2086 static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
2088 const uint8_t *buf_ptr= *pbuf_ptr;
2090 buf_ptr++; //gurantees that -1 is within the array
2091 buf_end -= 2; // gurantees that +2 is within the array
2093 while (buf_ptr < buf_end) {
2095 while(buf_ptr < buf_end && buf_ptr[1]==0)
2098 if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
2099 *pbuf_ptr = buf_ptr+3;
2100 return buf_ptr[2] + 0x100;
2105 buf_end += 2; //undo the hack above
2107 *pbuf_ptr = buf_end;
2111 static int mpeg1_decode_picture(AVCodecContext *avctx,
2112 const uint8_t *buf, int buf_size)
2114 Mpeg1Context *s1 = avctx->priv_data;
2115 MpegEncContext *s = &s1->mpeg_enc_ctx;
2116 int ref, f_code, vbv_delay;
2118 if(mpeg_decode_postinit(s->avctx) < 0)
2121 init_get_bits(&s->gb, buf, buf_size*8);
2123 ref = get_bits(&s->gb, 10); /* temporal ref */
2124 s->pict_type = get_bits(&s->gb, 3);
2125 if(s->pict_type == 0 || s->pict_type > 3)
2128 vbv_delay= get_bits(&s->gb, 16);
2129 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2130 s->full_pel[0] = get_bits1(&s->gb);
2131 f_code = get_bits(&s->gb, 3);
2134 s->mpeg_f_code[0][0] = f_code;
2135 s->mpeg_f_code[0][1] = f_code;
2137 if (s->pict_type == B_TYPE) {
2138 s->full_pel[1] = get_bits1(&s->gb);
2139 f_code = get_bits(&s->gb, 3);
2142 s->mpeg_f_code[1][0] = f_code;
2143 s->mpeg_f_code[1][1] = f_code;
2145 s->current_picture.pict_type= s->pict_type;
2146 s->current_picture.key_frame= s->pict_type == I_TYPE;
2148 if(avctx->debug & FF_DEBUG_PICT_INFO)
2149 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2157 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2159 MpegEncContext *s= &s1->mpeg_enc_ctx;
2160 int horiz_size_ext, vert_size_ext;
2163 skip_bits(&s->gb, 1); /* profil and level esc*/
2164 s->avctx->profile= get_bits(&s->gb, 3);
2165 s->avctx->level= get_bits(&s->gb, 4);
2166 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2167 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2168 horiz_size_ext = get_bits(&s->gb, 2);
2169 vert_size_ext = get_bits(&s->gb, 2);
2170 s->width |= (horiz_size_ext << 12);
2171 s->height |= (vert_size_ext << 12);
2172 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
2173 s->bit_rate += (bit_rate_ext << 18) * 400;
2174 skip_bits1(&s->gb); /* marker */
2175 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2177 s->low_delay = get_bits1(&s->gb);
2178 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2180 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2181 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2183 dprintf("sequence extension\n");
2184 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2185 s->avctx->sub_id = 2; /* indicates mpeg2 found */
2187 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2188 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2189 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2193 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2195 MpegEncContext *s= &s1->mpeg_enc_ctx;
2196 int color_description, w, h;
2198 skip_bits(&s->gb, 3); /* video format */
2199 color_description= get_bits1(&s->gb);
2200 if(color_description){
2201 skip_bits(&s->gb, 8); /* color primaries */
2202 skip_bits(&s->gb, 8); /* transfer_characteristics */
2203 skip_bits(&s->gb, 8); /* matrix_coefficients */
2205 w= get_bits(&s->gb, 14);
2206 skip_bits(&s->gb, 1); //marker
2207 h= get_bits(&s->gb, 14);
2208 skip_bits(&s->gb, 1); //marker
2210 s1->pan_scan.width= 16*w;
2211 s1->pan_scan.height=16*h;
2213 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2214 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2217 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2219 MpegEncContext *s= &s1->mpeg_enc_ctx;
2223 if(s->progressive_sequence){
2224 if(s->repeat_first_field){
2226 if(s->top_field_first)
2230 if(s->picture_structure == PICT_FRAME){
2232 if(s->repeat_first_field)
2236 for(i=0; i<nofco; i++){
2237 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2238 skip_bits(&s->gb, 1); //marker
2239 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2240 skip_bits(&s->gb, 1); //marker
2243 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2244 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2245 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2246 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2247 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2251 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2255 dprintf("matrix extension\n");
2257 if (get_bits1(&s->gb)) {
2259 v = get_bits(&s->gb, 8);
2260 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2261 s->intra_matrix[j] = v;
2262 s->chroma_intra_matrix[j] = v;
2265 if (get_bits1(&s->gb)) {
2267 v = get_bits(&s->gb, 8);
2268 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2269 s->inter_matrix[j] = v;
2270 s->chroma_inter_matrix[j] = v;
2273 if (get_bits1(&s->gb)) {
2275 v = get_bits(&s->gb, 8);
2276 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2277 s->chroma_intra_matrix[j] = v;
2280 if (get_bits1(&s->gb)) {
2282 v = get_bits(&s->gb, 8);
2283 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2284 s->chroma_inter_matrix[j] = v;
2289 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2291 s->full_pel[0] = s->full_pel[1] = 0;
2292 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2293 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2294 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2295 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2296 s->intra_dc_precision = get_bits(&s->gb, 2);
2297 s->picture_structure = get_bits(&s->gb, 2);
2298 s->top_field_first = get_bits1(&s->gb);
2299 s->frame_pred_frame_dct = get_bits1(&s->gb);
2300 s->concealment_motion_vectors = get_bits1(&s->gb);
2301 s->q_scale_type = get_bits1(&s->gb);
2302 s->intra_vlc_format = get_bits1(&s->gb);
2303 s->alternate_scan = get_bits1(&s->gb);
2304 s->repeat_first_field = get_bits1(&s->gb);
2305 s->chroma_420_type = get_bits1(&s->gb);
2306 s->progressive_frame = get_bits1(&s->gb);
2308 if(s->picture_structure == PICT_FRAME)
2311 s->first_field ^= 1;
2312 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2315 if(s->alternate_scan){
2316 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2317 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2319 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2320 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2323 /* composite display not parsed */
2324 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2325 dprintf("picture_structure=%d\n", s->picture_structure);
2326 dprintf("top field first=%d\n", s->top_field_first);
2327 dprintf("repeat first field=%d\n", s->repeat_first_field);
2328 dprintf("conceal=%d\n", s->concealment_motion_vectors);
2329 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2330 dprintf("alternate_scan=%d\n", s->alternate_scan);
2331 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2332 dprintf("progressive_frame=%d\n", s->progressive_frame);
2335 static void mpeg_decode_extension(AVCodecContext *avctx,
2336 const uint8_t *buf, int buf_size)
2338 Mpeg1Context *s1 = avctx->priv_data;
2339 MpegEncContext *s = &s1->mpeg_enc_ctx;
2342 init_get_bits(&s->gb, buf, buf_size*8);
2344 ext_type = get_bits(&s->gb, 4);
2347 mpeg_decode_sequence_extension(s1);
2350 mpeg_decode_sequence_display_extension(s1);
2353 mpeg_decode_quant_matrix_extension(s);
2356 mpeg_decode_picture_display_extension(s1);
2359 mpeg_decode_picture_coding_extension(s);
2364 static void exchange_uv(MpegEncContext *s){
2365 short * tmp = s->pblocks[4];
2366 s->pblocks[4] = s->pblocks[5];
2367 s->pblocks[5] = tmp;
2370 static int mpeg_field_start(MpegEncContext *s){
2371 AVCodecContext *avctx= s->avctx;
2372 Mpeg1Context *s1 = (Mpeg1Context*)s;
2374 /* start frame decoding */
2375 if(s->first_field || s->picture_structure==PICT_FRAME){
2376 if(MPV_frame_start(s, avctx) < 0)
2379 ff_er_frame_start(s);
2381 /* first check if we must repeat the frame */
2382 s->current_picture_ptr->repeat_pict = 0;
2383 if (s->repeat_first_field) {
2384 if (s->progressive_sequence) {
2385 if (s->top_field_first)
2386 s->current_picture_ptr->repeat_pict = 4;
2388 s->current_picture_ptr->repeat_pict = 2;
2389 } else if (s->progressive_frame) {
2390 s->current_picture_ptr->repeat_pict = 1;
2394 *s->current_picture_ptr->pan_scan= s1->pan_scan;
2395 }else{ //second field
2398 if(!s->current_picture_ptr){
2399 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2404 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2405 if(s->picture_structure == PICT_BOTTOM_FIELD){
2406 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2411 // MPV_frame_start will call this function too,
2412 // but we need to call it on every field
2413 if(s->avctx->xvmc_acceleration)
2414 XVMC_field_start(s,avctx);
2420 #define DECODE_SLICE_ERROR -1
2421 #define DECODE_SLICE_OK 0
2424 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2425 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2426 * DECODE_SLICE_OK if this slice is ok<br>
2428 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2429 const uint8_t **buf, int buf_size)
2431 MpegEncContext *s = &s1->mpeg_enc_ctx;
2432 AVCodecContext *avctx= s->avctx;
2434 const int field_pic= s->picture_structure != PICT_FRAME;
2435 const int lowres= s->avctx->lowres;
2440 if (mb_y<<field_pic >= s->mb_height){
2441 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2445 init_get_bits(&s->gb, *buf, buf_size*8);
2447 ff_mpeg1_clean_buffers(s);
2448 s->interlaced_dct = 0;
2450 s->qscale = get_qscale(s);
2453 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2457 /* extra slice info */
2458 while (get_bits1(&s->gb) != 0) {
2459 skip_bits(&s->gb, 8);
2465 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2467 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2474 /* otherwise, stuffing, nothing to do */
2481 s->resync_mb_x= s->mb_x;
2482 s->resync_mb_y= s->mb_y= mb_y;
2484 ff_init_block_index(s);
2486 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2487 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2488 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
2489 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],
2490 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2491 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2492 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2493 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2499 //one 1 we memcpy blocks in xvmcvideo
2500 if(s->avctx->xvmc_acceleration > 1)
2501 XVMC_init_block(s);//set s->block
2504 s->dsp.clear_blocks(s->block[0]);
2505 if(!s->chroma_y_shift){
2506 s->dsp.clear_blocks(s->block[6]);
2508 ret = mpeg_decode_mb(s, s->block);
2509 s->chroma_qscale= s->qscale;
2511 dprintf("ret=%d\n", ret);
2515 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2516 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2517 int xy = s->mb_x*2 + s->mb_y*2*wrap;
2518 int motion_x, motion_y, dir, i;
2519 if(field_pic && !s->first_field)
2523 for(dir=0; dir<2; dir++){
2524 if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2525 motion_x = motion_y = 0;
2526 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2527 motion_x = s->mv[dir][0][0];
2528 motion_y = s->mv[dir][0][1];
2529 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2530 motion_x = s->mv[dir][i][0];
2531 motion_y = s->mv[dir][i][1];
2534 s->current_picture.motion_val[dir][xy ][0] = motion_x;
2535 s->current_picture.motion_val[dir][xy ][1] = motion_y;
2536 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2537 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2538 s->current_picture.ref_index [dir][xy ]=
2539 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2545 s->dest[0] += 16 >> lowres;
2546 s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2547 s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2549 MPV_decode_mb(s, s->block);
2551 if (++s->mb_x >= s->mb_width) {
2552 const int mb_size= 16>>s->avctx->lowres;
2554 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2559 if(s->mb_y<<field_pic >= s->mb_height){
2560 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2562 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2563 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2564 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2570 ff_init_block_index(s);
2573 /* skip mb handling */
2574 if (s->mb_skip_run == -1) {
2575 /* read again increment */
2578 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2580 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2585 s->mb_skip_run += 33;
2586 }else if(code == 35){
2587 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2588 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2591 goto eos; /* end of slice */
2593 /* otherwise, stuffing, nothing to do */
2595 s->mb_skip_run += code;
2601 eos: // end of slice
2602 *buf += get_bits_count(&s->gb)/8 - 1;
2603 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2607 static int slice_decode_thread(AVCodecContext *c, void *arg){
2608 MpegEncContext *s= arg;
2609 const uint8_t *buf= s->gb.buffer;
2610 int mb_y= s->start_mb_y;
2612 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2615 int start_code, ret;
2617 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2619 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2620 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
2622 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2623 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2625 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
2628 if(s->mb_y == s->end_mb_y)
2631 start_code = find_start_code(&buf, s->gb.buffer_end);
2632 mb_y= start_code - SLICE_MIN_START_CODE;
2633 if(mb_y < 0 || mb_y >= s->end_mb_y)
2637 return 0; //not reached
2641 * handles slice ends.
2642 * @return 1 if it seems to be the last slice of
2644 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2646 Mpeg1Context *s1 = avctx->priv_data;
2647 MpegEncContext *s = &s1->mpeg_enc_ctx;
2649 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2653 if(s->avctx->xvmc_acceleration)
2656 /* end of slice reached */
2657 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2660 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2666 if (s->pict_type == B_TYPE || s->low_delay) {
2667 *pict= *(AVFrame*)s->current_picture_ptr;
2668 ff_print_debug_info(s, pict);
2670 s->picture_number++;
2671 /* latency of 1 frame for I and P frames */
2672 /* XXX: use another variable than picture_number */
2673 if (s->last_picture_ptr != NULL) {
2674 *pict= *(AVFrame*)s->last_picture_ptr;
2675 ff_print_debug_info(s, pict);
2685 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2686 const uint8_t *buf, int buf_size)
2688 Mpeg1Context *s1 = avctx->priv_data;
2689 MpegEncContext *s = &s1->mpeg_enc_ctx;
2693 init_get_bits(&s->gb, buf, buf_size*8);
2695 width = get_bits(&s->gb, 12);
2696 height = get_bits(&s->gb, 12);
2697 if (width <= 0 || height <= 0 ||
2698 (width % 2) != 0 || (height % 2) != 0)
2700 s->aspect_ratio_info= get_bits(&s->gb, 4);
2701 if (s->aspect_ratio_info == 0)
2703 s->frame_rate_index = get_bits(&s->gb, 4);
2704 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2706 s->bit_rate = get_bits(&s->gb, 18) * 400;
2707 if (get_bits1(&s->gb) == 0) /* marker */
2712 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2713 skip_bits(&s->gb, 1);
2716 if (get_bits1(&s->gb)) {
2718 v = get_bits(&s->gb, 8);
2720 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2723 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2724 s->intra_matrix[j] = v;
2725 s->chroma_intra_matrix[j] = v;
2728 dprintf("intra matrix present\n");
2730 dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2735 j = s->dsp.idct_permutation[i];
2736 v = ff_mpeg1_default_intra_matrix[i];
2737 s->intra_matrix[j] = v;
2738 s->chroma_intra_matrix[j] = v;
2741 if (get_bits1(&s->gb)) {
2743 v = get_bits(&s->gb, 8);
2745 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2748 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2749 s->inter_matrix[j] = v;
2750 s->chroma_inter_matrix[j] = v;
2753 dprintf("non intra matrix present\n");
2755 dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2760 int j= s->dsp.idct_permutation[i];
2761 v = ff_mpeg1_default_non_intra_matrix[i];
2762 s->inter_matrix[j] = v;
2763 s->chroma_inter_matrix[j] = v;
2767 if(show_bits(&s->gb, 23) != 0){
2768 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2772 /* we set mpeg2 parameters so that it emulates mpeg1 */
2773 s->progressive_sequence = 1;
2774 s->progressive_frame = 1;
2775 s->picture_structure = PICT_FRAME;
2776 s->frame_pred_frame_dct = 1;
2777 s->chroma_format = 1;
2778 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2779 avctx->sub_id = 1; /* indicates mpeg1 */
2780 s->out_format = FMT_MPEG1;
2781 s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2782 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2784 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2785 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2786 s->avctx->rc_buffer_size, s->bit_rate);
2791 static int vcr2_init_sequence(AVCodecContext *avctx)
2793 Mpeg1Context *s1 = avctx->priv_data;
2794 MpegEncContext *s = &s1->mpeg_enc_ctx;
2797 /* start new mpeg1 context decoding */
2798 s->out_format = FMT_MPEG1;
2799 if (s1->mpeg_enc_ctx_allocated) {
2802 s->width = avctx->coded_width;
2803 s->height = avctx->coded_height;
2804 avctx->has_b_frames= 0; //true?
2807 if(avctx->xvmc_acceleration){
2808 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2810 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2813 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2814 if( avctx->idct_algo == FF_IDCT_AUTO )
2815 avctx->idct_algo = FF_IDCT_SIMPLE;
2817 if (MPV_common_init(s) < 0)
2819 exchange_uv(s);//common init reset pblocks, so we swap them here
2820 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2821 s1->mpeg_enc_ctx_allocated = 1;
2824 int j= s->dsp.idct_permutation[i];
2825 v = ff_mpeg1_default_intra_matrix[i];
2826 s->intra_matrix[j] = v;
2827 s->chroma_intra_matrix[j] = v;
2829 v = ff_mpeg1_default_non_intra_matrix[i];
2830 s->inter_matrix[j] = v;
2831 s->chroma_inter_matrix[j] = v;
2834 s->progressive_sequence = 1;
2835 s->progressive_frame = 1;
2836 s->picture_structure = PICT_FRAME;
2837 s->frame_pred_frame_dct = 1;
2838 s->chroma_format = 1;
2839 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2840 avctx->sub_id = 2; /* indicates mpeg2 */
2845 static void mpeg_decode_user_data(AVCodecContext *avctx,
2846 const uint8_t *buf, int buf_size)
2853 /* we parse the DTG active format information */
2855 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2869 avctx->dtg_active_format = p[0] & 0x0f;
2874 static void mpeg_decode_gop(AVCodecContext *avctx,
2875 const uint8_t *buf, int buf_size){
2876 Mpeg1Context *s1 = avctx->priv_data;
2877 MpegEncContext *s = &s1->mpeg_enc_ctx;
2879 int drop_frame_flag;
2880 int time_code_hours, time_code_minutes;
2881 int time_code_seconds, time_code_pictures;
2884 init_get_bits(&s->gb, buf, buf_size*8);
2886 drop_frame_flag = get_bits1(&s->gb);
2888 time_code_hours=get_bits(&s->gb,5);
2889 time_code_minutes = get_bits(&s->gb,6);
2890 skip_bits1(&s->gb);//marker bit
2891 time_code_seconds = get_bits(&s->gb,6);
2892 time_code_pictures = get_bits(&s->gb,6);
2894 /*broken_link indicate that after editing the
2895 reference frames of the first B-Frames after GOP I-Frame
2896 are missing (open gop)*/
2897 broken_link = get_bits1(&s->gb);
2899 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2900 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2901 time_code_hours, time_code_minutes, time_code_seconds,
2902 time_code_pictures, broken_link);
2905 * finds the end of the current frame in the bitstream.
2906 * @return the position of the first byte of the next frame, or -1
2908 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2916 if(!pc->frame_start_found){
2917 for(i=0; i<buf_size; i++){
2918 state= (state<<8) | buf[i];
2919 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2921 pc->frame_start_found=1;
2927 if(pc->frame_start_found){
2928 /* EOF considered as end of frame */
2931 for(; i<buf_size; i++){
2932 state= (state<<8) | buf[i];
2933 if((state&0xFFFFFF00) == 0x100){
2934 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2935 pc->frame_start_found=0;
2943 return END_NOT_FOUND;
2946 /* handle buffering and image synchronisation */
2947 static int mpeg_decode_frame(AVCodecContext *avctx,
2948 void *data, int *data_size,
2949 uint8_t *buf, int buf_size)
2951 Mpeg1Context *s = avctx->priv_data;
2952 const uint8_t *buf_end;
2953 const uint8_t *buf_ptr;
2954 int ret, start_code, input_size;
2955 AVFrame *picture = data;
2956 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2957 dprintf("fill_buffer\n");
2959 if (buf_size == 0) {
2960 /* special case for last picture */
2961 if (s2->low_delay==0 && s2->next_picture_ptr) {
2962 *picture= *(AVFrame*)s2->next_picture_ptr;
2963 s2->next_picture_ptr= NULL;
2965 *data_size = sizeof(AVFrame);
2970 if(s2->flags&CODEC_FLAG_TRUNCATED){
2971 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2973 if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
2978 buf_end = buf + buf_size;
2981 if (s->repeat_field % 2 == 1) {
2983 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2984 // s2->picture_number, s->repeat_field);
2985 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2986 *data_size = sizeof(AVPicture);
2992 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2993 vcr2_init_sequence(avctx);
2998 /* find start next code */
2999 start_code = find_start_code(&buf_ptr, buf_end);
3000 if (start_code < 0){
3001 if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
3002 if(avctx->thread_count > 1){
3005 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3006 for(i=0; i<s->slice_count; i++)
3007 s2->error_count += s2->thread_context[i]->error_count;
3009 if (slice_end(avctx, picture)) {
3010 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3011 *data_size = sizeof(AVPicture);
3014 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3017 input_size = buf_end - buf_ptr;
3019 if(avctx->debug & FF_DEBUG_STARTCODE){
3020 av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3023 /* prepare data for next start code */
3024 switch(start_code) {
3025 case SEQ_START_CODE:
3026 mpeg1_decode_sequence(avctx, buf_ptr,
3030 case PICTURE_START_CODE:
3031 /* we have a complete image : we try to decompress it */
3032 mpeg1_decode_picture(avctx,
3033 buf_ptr, input_size);
3035 case EXT_START_CODE:
3036 mpeg_decode_extension(avctx,
3037 buf_ptr, input_size);
3039 case USER_START_CODE:
3040 mpeg_decode_user_data(avctx,
3041 buf_ptr, input_size);
3043 case GOP_START_CODE:
3045 mpeg_decode_gop(avctx,
3046 buf_ptr, input_size);
3049 if (start_code >= SLICE_MIN_START_CODE &&
3050 start_code <= SLICE_MAX_START_CODE) {
3051 int mb_y= start_code - SLICE_MIN_START_CODE;
3053 /* skip b frames if we dont have reference frames */
3054 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
3055 /* skip b frames if we are in a hurry */
3056 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3057 /* skip everything if we are in a hurry>=5 */
3058 if(avctx->hurry_up>=5) break;
3060 if (!s->mpeg_enc_ctx_allocated) break;
3062 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3063 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3067 if(s2->first_slice){
3069 if(mpeg_field_start(s2) < 0)
3073 if(avctx->thread_count > 1){
3074 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3075 if(threshold <= mb_y){
3076 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3078 thread_context->start_mb_y= mb_y;
3079 thread_context->end_mb_y = s2->mb_height;
3081 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3082 ff_update_duplicate_context(thread_context, s2);
3084 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3087 buf_ptr += 2; //FIXME add minimum num of bytes per slice
3089 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3093 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3094 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);
3096 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);
3105 static int mpeg_decode_end(AVCodecContext *avctx)
3107 Mpeg1Context *s = avctx->priv_data;
3109 if (s->mpeg_enc_ctx_allocated)
3110 MPV_common_end(&s->mpeg_enc_ctx);
3114 AVCodec mpeg1video_decoder = {
3117 CODEC_ID_MPEG1VIDEO,
3118 sizeof(Mpeg1Context),
3123 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3124 .flush= ff_mpeg_flush,
3127 AVCodec mpeg2video_decoder = {
3130 CODEC_ID_MPEG2VIDEO,
3131 sizeof(Mpeg1Context),
3136 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3137 .flush= ff_mpeg_flush,
3141 AVCodec mpegvideo_decoder = {
3144 CODEC_ID_MPEG2VIDEO,
3145 sizeof(Mpeg1Context),
3150 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3151 .flush= ff_mpeg_flush,
3154 #ifdef CONFIG_ENCODERS
3156 AVCodec mpeg1video_encoder = {
3159 CODEC_ID_MPEG1VIDEO,
3160 sizeof(MpegEncContext),
3164 .supported_framerates= frame_rate_tab+1,
3165 .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3166 .capabilities= CODEC_CAP_DELAY,
3169 AVCodec mpeg2video_encoder = {
3172 CODEC_ID_MPEG2VIDEO,
3173 sizeof(MpegEncContext),
3177 .supported_framerates= frame_rate_tab+1,
3178 .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3179 .capabilities= CODEC_CAP_DELAY,
3184 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3187 if( avctx->thread_count > 1)
3189 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3191 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3192 dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3194 mpeg_decode_init(avctx);
3195 s = avctx->priv_data;
3197 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3198 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3203 AVCodec mpeg_xvmc_decoder = {
3206 CODEC_ID_MPEG2VIDEO_XVMC,
3207 sizeof(Mpeg1Context),
3208 mpeg_mc_decode_init,
3212 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3213 .flush= ff_mpeg_flush,
3218 /* this is ugly i know, but the alternative is too make
3219 hundreds of vars global and prefix them with ff_mpeg1_
3220 which is far uglier. */