Give context to dprintf
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG1 codec / MPEG2 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard.
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file mpeg12.c
25  * MPEG1/2 codec
26  */
27
28 //#define DEBUG
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "mpegvideo.h"
32
33 #include "mpeg12data.h"
34 #include "bytestream.h"
35
36 //#undef NDEBUG
37 //#include <assert.h>
38
39
40 /* Start codes. */
41 #define SEQ_END_CODE            0x000001b7
42 #define SEQ_START_CODE          0x000001b3
43 #define GOP_START_CODE          0x000001b8
44 #define PICTURE_START_CODE      0x00000100
45 #define SLICE_MIN_START_CODE    0x00000101
46 #define SLICE_MAX_START_CODE    0x000001af
47 #define EXT_START_CODE          0x000001b5
48 #define USER_START_CODE         0x000001b2
49
50 #define DC_VLC_BITS 9
51 #define MV_VLC_BITS 9
52 #define MBINCR_VLC_BITS 9
53 #define MB_PAT_VLC_BITS 9
54 #define MB_PTYPE_VLC_BITS 6
55 #define MB_BTYPE_VLC_BITS 6
56 #define TEX_VLC_BITS 9
57
58 #ifdef CONFIG_ENCODERS
59 static void mpeg1_encode_block(MpegEncContext *s,
60                          DCTELEM *block,
61                          int component);
62 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
63 #endif //CONFIG_ENCODERS
64 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
65                               DCTELEM *block,
66                               int n);
67 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
68                               DCTELEM *block,
69                               int n);
70 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
71 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
72                                         DCTELEM *block,
73                                         int n);
74 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
75                                     DCTELEM *block,
76                                     int n);
77 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
78 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
79 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
80 static void exchange_uv(MpegEncContext *s);
81
82 #ifdef HAVE_XVMC
83 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
84 extern int XVMC_field_end(MpegEncContext *s);
85 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
86 extern void XVMC_init_block(MpegEncContext *s);//set s->block
87 #endif
88
89 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
90 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
91 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
92 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
93                                            PIX_FMT_XVMC_MPEG2_IDCT,
94                                            PIX_FMT_XVMC_MPEG2_MC,
95                                            -1};
96 #ifdef CONFIG_ENCODERS
97 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
98 static uint8_t fcode_tab[MAX_MV*2+1];
99
100 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
101 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
102
103 /* simple include everything table for dc, first byte is bits number next 3 are code*/
104 static uint32_t mpeg1_lum_dc_uni[512];
105 static uint32_t mpeg1_chr_dc_uni[512];
106
107 static uint8_t mpeg1_index_run[2][64];
108 static int8_t mpeg1_max_level[2][64];
109 #endif //CONFIG_ENCODERS
110
111 static void init_2d_vlc_rl(RLTable *rl, int use_static)
112 {
113     int i;
114
115     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
116              &rl->table_vlc[0][1], 4, 2,
117              &rl->table_vlc[0][0], 4, 2, use_static);
118
119     if(use_static)
120         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
121     else
122         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
123
124     for(i=0; i<rl->vlc.table_size; i++){
125         int code= rl->vlc.table[i][0];
126         int len = rl->vlc.table[i][1];
127         int level, run;
128
129         if(len==0){ // illegal code
130             run= 65;
131             level= MAX_LEVEL;
132         }else if(len<0){ //more bits needed
133             run= 0;
134             level= code;
135         }else{
136             if(code==rl->n){ //esc
137                 run= 65;
138                 level= 0;
139             }else if(code==rl->n+1){ //eob
140                 run= 0;
141                 level= 127;
142             }else{
143                 run=   rl->table_run  [code] + 1;
144                 level= rl->table_level[code];
145             }
146         }
147         rl->rl_vlc[0][i].len= len;
148         rl->rl_vlc[0][i].level= level;
149         rl->rl_vlc[0][i].run= run;
150     }
151 }
152
153 #ifdef CONFIG_ENCODERS
154 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
155     int i;
156
157     for(i=0; i<128; i++){
158         int level= i-64;
159         int run;
160         for(run=0; run<64; run++){
161             int len, bits, code;
162
163             int alevel= FFABS(level);
164             int sign= (level>>31)&1;
165
166             if (alevel > rl->max_level[0][run])
167                 code= 111; /*rl->n*/
168             else
169                 code= rl->index_run[0][run] + alevel - 1;
170
171             if (code < 111 /* rl->n */) {
172                 /* store the vlc & sign at once */
173                 len=   rl->table_vlc[code][1]+1;
174                 bits= (rl->table_vlc[code][0]<<1) + sign;
175             } else {
176                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
177                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
178
179                 bits|= run;
180                 if (alevel < 128) {
181                     bits<<=8; len+=8;
182                     bits|= level & 0xff;
183                 } else {
184                     bits<<=16; len+=16;
185                     bits|= level & 0xff;
186                     if (level < 0) {
187                         bits|= 0x8001 + level + 255;
188                     } else {
189                         bits|= level & 0xffff;
190                     }
191                 }
192             }
193
194             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
195         }
196     }
197 }
198
199
200 static int find_frame_rate_index(MpegEncContext *s){
201     int i;
202     int64_t dmin= INT64_MAX;
203     int64_t d;
204
205     for(i=1;i<14;i++) {
206         int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
207         int64_t n1= 1001LL*s->avctx->time_base.den;
208         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
209
210         d = FFABS(n0 - n1);
211         if(d < dmin){
212             dmin=d;
213             s->frame_rate_index= i;
214         }
215     }
216     if(dmin)
217         return -1;
218     else
219         return 0;
220 }
221
222 static int encode_init(AVCodecContext *avctx)
223 {
224     MpegEncContext *s = avctx->priv_data;
225
226     if(MPV_encode_init(avctx) < 0)
227         return -1;
228
229     if(find_frame_rate_index(s) < 0){
230         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
231             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
232             return -1;
233         }else{
234             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
235         }
236     }
237
238     if(avctx->profile == FF_PROFILE_UNKNOWN){
239         if(avctx->level != FF_LEVEL_UNKNOWN){
240             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
241             return -1;
242         }
243         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
244     }
245
246     if(avctx->level == FF_LEVEL_UNKNOWN){
247         if(avctx->profile == 0){ /* 4:2:2 */
248             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
249             else                                            avctx->level = 2; /* High */
250         }else{
251             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
252                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
253                 return -1;
254             }
255             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
256             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
257             else                                            avctx->level = 4; /* High */
258         }
259     }
260
261     if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
262         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
263         return -1;
264     }
265
266     return 0;
267 }
268
269 static void put_header(MpegEncContext *s, int header)
270 {
271     align_put_bits(&s->pb);
272     put_bits(&s->pb, 16, header>>16);
273     put_bits(&s->pb, 16, header&0xFFFF);
274 }
275
276 /* put sequence header if needed */
277 static void mpeg1_encode_sequence_header(MpegEncContext *s)
278 {
279         unsigned int vbv_buffer_size;
280         unsigned int fps, v;
281         int i;
282         uint64_t time_code;
283         float best_aspect_error= 1E10;
284         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
285         int constraint_parameter_flag;
286
287         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
288
289         if (s->current_picture.key_frame) {
290             AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
291
292             /* mpeg1 header repeated every gop */
293             put_header(s, SEQ_START_CODE);
294
295             put_bits(&s->pb, 12, s->width);
296             put_bits(&s->pb, 12, s->height);
297
298             for(i=1; i<15; i++){
299                 float error= aspect_ratio;
300                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
301                     error-= 1.0/mpeg1_aspect[i];
302                 else
303                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
304
305                 error= FFABS(error);
306
307                 if(error < best_aspect_error){
308                     best_aspect_error= error;
309                     s->aspect_ratio_info= i;
310                 }
311             }
312
313             put_bits(&s->pb, 4, s->aspect_ratio_info);
314             put_bits(&s->pb, 4, s->frame_rate_index);
315
316             if(s->avctx->rc_max_rate){
317                 v = (s->avctx->rc_max_rate + 399) / 400;
318                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
319                     v = 0x3ffff;
320             }else{
321                 v= 0x3FFFF;
322             }
323
324             if(s->avctx->rc_buffer_size)
325                 vbv_buffer_size = s->avctx->rc_buffer_size;
326             else
327                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
328                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
329             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
330
331             put_bits(&s->pb, 18, v & 0x3FFFF);
332             put_bits(&s->pb, 1, 1); /* marker */
333             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
334
335             constraint_parameter_flag=
336                 s->width <= 768 && s->height <= 576 &&
337                 s->mb_width * s->mb_height <= 396 &&
338                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
339                 framerate.num <= framerate.den*30 &&
340                 s->avctx->me_range && s->avctx->me_range < 128 &&
341                 vbv_buffer_size <= 20 &&
342                 v <= 1856000/400 &&
343                 s->codec_id == CODEC_ID_MPEG1VIDEO;
344
345             put_bits(&s->pb, 1, constraint_parameter_flag);
346
347             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
348             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
349
350             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
351                 put_header(s, EXT_START_CODE);
352                 put_bits(&s->pb, 4, 1); //seq ext
353
354                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
355
356                 put_bits(&s->pb, 3, s->avctx->profile); //profile
357                 put_bits(&s->pb, 4, s->avctx->level); //level
358
359                 put_bits(&s->pb, 1, s->progressive_sequence);
360                 put_bits(&s->pb, 2, s->chroma_format);
361                 put_bits(&s->pb, 2, 0); //horizontal size ext
362                 put_bits(&s->pb, 2, 0); //vertical size ext
363                 put_bits(&s->pb, 12, v>>18); //bitrate ext
364                 put_bits(&s->pb, 1, 1); //marker
365                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
366                 put_bits(&s->pb, 1, s->low_delay);
367                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
368                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
369             }
370
371             put_header(s, GOP_START_CODE);
372             put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
373             /* time code : we must convert from the real frame rate to a
374                fake mpeg frame rate in case of low frame rate */
375             fps = (framerate.num + framerate.den/2)/ framerate.den;
376             time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
377
378             s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
379             if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
380                 /* only works for NTSC 29.97 */
381                 int d = time_code / 17982;
382                 int m = time_code % 17982;
383                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
384                 time_code += 18 * d + 2 * ((m - 2) / 1798);
385             }
386             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
387             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
388             put_bits(&s->pb, 1, 1);
389             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
390             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
391             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
392             put_bits(&s->pb, 1, 0); /* broken link */
393         }
394 }
395
396 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
397     while (run >= 33) {
398         put_bits(&s->pb, 11, 0x008);
399         run -= 33;
400     }
401     put_bits(&s->pb, mbAddrIncrTable[run][1],
402              mbAddrIncrTable[run][0]);
403 }
404 #endif //CONFIG_ENCODERS
405
406 static void common_init(MpegEncContext *s)
407 {
408
409     s->y_dc_scale_table=
410     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
411
412 }
413
414 void ff_mpeg1_clean_buffers(MpegEncContext *s){
415     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
416     s->last_dc[1] = s->last_dc[0];
417     s->last_dc[2] = s->last_dc[0];
418     memset(s->last_mv, 0, sizeof(s->last_mv));
419 }
420
421 #ifdef CONFIG_ENCODERS
422
423 static av_always_inline void put_qscale(MpegEncContext *s)
424 {
425     if(s->q_scale_type){
426         assert(s->qscale>=1 && s->qscale <=12);
427         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
428     }else{
429         put_bits(&s->pb, 5, s->qscale);
430     }
431 }
432
433 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
434     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
435     put_qscale(s);
436     put_bits(&s->pb, 1, 0); /* slice extra information */
437 }
438
439 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
440 {
441     mpeg1_encode_sequence_header(s);
442
443     /* mpeg1 picture header */
444     put_header(s, PICTURE_START_CODE);
445     /* temporal reference */
446
447     // RAL: s->picture_number instead of s->fake_picture_number
448     put_bits(&s->pb, 10, (s->picture_number -
449                           s->gop_picture_number) & 0x3ff);
450     put_bits(&s->pb, 3, s->pict_type);
451
452     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
453     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
454
455     // RAL: Forward f_code also needed for B frames
456     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
457         put_bits(&s->pb, 1, 0); /* half pel coordinates */
458         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
459             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
460         else
461             put_bits(&s->pb, 3, 7); /* forward_f_code */
462     }
463
464     // RAL: Backward f_code necessary for B frames
465     if (s->pict_type == B_TYPE) {
466         put_bits(&s->pb, 1, 0); /* half pel coordinates */
467         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
468             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
469         else
470             put_bits(&s->pb, 3, 7); /* backward_f_code */
471     }
472
473     put_bits(&s->pb, 1, 0); /* extra bit picture */
474
475     s->frame_pred_frame_dct = 1;
476     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
477         put_header(s, EXT_START_CODE);
478         put_bits(&s->pb, 4, 8); //pic ext
479         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
480             put_bits(&s->pb, 4, s->f_code);
481             put_bits(&s->pb, 4, s->f_code);
482         }else{
483             put_bits(&s->pb, 8, 255);
484         }
485         if (s->pict_type == B_TYPE) {
486             put_bits(&s->pb, 4, s->b_code);
487             put_bits(&s->pb, 4, s->b_code);
488         }else{
489             put_bits(&s->pb, 8, 255);
490         }
491         put_bits(&s->pb, 2, s->intra_dc_precision);
492
493         assert(s->picture_structure == PICT_FRAME);
494         put_bits(&s->pb, 2, s->picture_structure);
495         if (s->progressive_sequence) {
496             put_bits(&s->pb, 1, 0); /* no repeat */
497         } else {
498             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
499         }
500         /* XXX: optimize the generation of this flag with entropy
501            measures */
502         s->frame_pred_frame_dct = s->progressive_sequence;
503
504         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
505         put_bits(&s->pb, 1, s->concealment_motion_vectors);
506         put_bits(&s->pb, 1, s->q_scale_type);
507         put_bits(&s->pb, 1, s->intra_vlc_format);
508         put_bits(&s->pb, 1, s->alternate_scan);
509         put_bits(&s->pb, 1, s->repeat_first_field);
510         s->progressive_frame = s->progressive_sequence;
511         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
512         put_bits(&s->pb, 1, s->progressive_frame);
513         put_bits(&s->pb, 1, 0); //composite_display_flag
514     }
515     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
516         int i;
517
518         put_header(s, USER_START_CODE);
519         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
520             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
521         }
522     }
523
524     s->mb_y=0;
525     ff_mpeg1_encode_slice_header(s);
526 }
527
528 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
529                                 int has_mv, int field_motion)
530 {
531     put_bits(&s->pb, n, bits);
532     if (!s->frame_pred_frame_dct) {
533         if (has_mv)
534             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
535         put_bits(&s->pb, 1, s->interlaced_dct);
536     }
537 }
538
539 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
540                                                    DCTELEM block[6][64],
541                                                    int motion_x, int motion_y,
542                                                    int mb_block_count)
543 {
544     int i, cbp;
545     const int mb_x = s->mb_x;
546     const int mb_y = s->mb_y;
547     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
548
549     /* compute cbp */
550     cbp = 0;
551     for(i=0;i<mb_block_count;i++) {
552         if (s->block_last_index[i] >= 0)
553             cbp |= 1 << (mb_block_count - 1 - i);
554     }
555
556     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
557         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
558         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
559         (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) |
560         ((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))) {
561         s->mb_skip_run++;
562         s->qscale -= s->dquant;
563         s->skip_count++;
564         s->misc_bits++;
565         s->last_bits++;
566         if(s->pict_type == P_TYPE){
567             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
568             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
569         }
570     } else {
571         if(first_mb){
572             assert(s->mb_skip_run == 0);
573             encode_mb_skip_run(s, s->mb_x);
574         }else{
575             encode_mb_skip_run(s, s->mb_skip_run);
576         }
577
578         if (s->pict_type == I_TYPE) {
579             if(s->dquant && cbp){
580                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
581                 put_qscale(s);
582             }else{
583                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
584                 s->qscale -= s->dquant;
585             }
586             s->misc_bits+= get_bits_diff(s);
587             s->i_count++;
588         } else if (s->mb_intra) {
589             if(s->dquant && cbp){
590                 put_mb_modes(s, 6, 0x01, 0, 0);
591                 put_qscale(s);
592             }else{
593                 put_mb_modes(s, 5, 0x03, 0, 0);
594                 s->qscale -= s->dquant;
595             }
596             s->misc_bits+= get_bits_diff(s);
597             s->i_count++;
598             memset(s->last_mv, 0, sizeof(s->last_mv));
599         } else if (s->pict_type == P_TYPE) {
600             if(s->mv_type == MV_TYPE_16X16){
601                 if (cbp != 0) {
602                     if ((motion_x|motion_y) == 0) {
603                         if(s->dquant){
604                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
605                             put_qscale(s);
606                         }else{
607                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
608                         }
609                         s->misc_bits+= get_bits_diff(s);
610                     } else {
611                         if(s->dquant){
612                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
613                             put_qscale(s);
614                         }else{
615                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
616                         }
617                         s->misc_bits+= get_bits_diff(s);
618                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
619                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
620                         s->mv_bits+= get_bits_diff(s);
621                     }
622                 } else {
623                     put_bits(&s->pb, 3, 1); /* motion only */
624                     if (!s->frame_pred_frame_dct)
625                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
626                     s->misc_bits+= get_bits_diff(s);
627                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
628                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
629                     s->qscale -= s->dquant;
630                     s->mv_bits+= get_bits_diff(s);
631                 }
632                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
633                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
634             }else{
635                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
636
637                 if (cbp) {
638                     if(s->dquant){
639                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
640                         put_qscale(s);
641                     }else{
642                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
643                     }
644                 } else {
645                     put_bits(&s->pb, 3, 1); /* motion only */
646                     put_bits(&s->pb, 2, 1); /* motion_type: field */
647                     s->qscale -= s->dquant;
648                 }
649                 s->misc_bits+= get_bits_diff(s);
650                 for(i=0; i<2; i++){
651                     put_bits(&s->pb, 1, s->field_select[0][i]);
652                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
653                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
654                     s->last_mv[0][i][0]=   s->mv[0][i][0];
655                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
656                 }
657                 s->mv_bits+= get_bits_diff(s);
658             }
659             if(cbp) {
660                 if (s->chroma_y_shift) {
661                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
662                 } else {
663                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
664                     put_bits(&s->pb, 2, cbp & 3);
665                 }
666             }
667             s->f_count++;
668         } else{
669             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
670
671             if(s->mv_type == MV_TYPE_16X16){
672                 if (cbp){    // With coded bloc pattern
673                     if (s->dquant) {
674                         if(s->mv_dir == MV_DIR_FORWARD)
675                             put_mb_modes(s, 6, 3, 1, 0);
676                         else
677                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
678                         put_qscale(s);
679                     } else {
680                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
681                     }
682                 }else{    // No coded bloc pattern
683                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
684                     if (!s->frame_pred_frame_dct)
685                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
686                     s->qscale -= s->dquant;
687                 }
688                 s->misc_bits += get_bits_diff(s);
689                 if (s->mv_dir&MV_DIR_FORWARD){
690                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
691                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
692                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
693                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
694                     s->f_count++;
695                 }
696                 if (s->mv_dir&MV_DIR_BACKWARD){
697                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
698                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
699                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
700                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
701                     s->b_count++;
702                 }
703             }else{
704                 assert(s->mv_type == MV_TYPE_FIELD);
705                 assert(!s->frame_pred_frame_dct);
706                 if (cbp){    // With coded bloc pattern
707                     if (s->dquant) {
708                         if(s->mv_dir == MV_DIR_FORWARD)
709                             put_mb_modes(s, 6, 3, 1, 1);
710                         else
711                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
712                         put_qscale(s);
713                     } else {
714                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
715                     }
716                 }else{    // No coded bloc pattern
717                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
718                     put_bits(&s->pb, 2, 1); /* motion_type: field */
719                     s->qscale -= s->dquant;
720                 }
721                 s->misc_bits += get_bits_diff(s);
722                 if (s->mv_dir&MV_DIR_FORWARD){
723                     for(i=0; i<2; i++){
724                         put_bits(&s->pb, 1, s->field_select[0][i]);
725                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
726                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
727                         s->last_mv[0][i][0]=   s->mv[0][i][0];
728                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
729                     }
730                     s->f_count++;
731                 }
732                 if (s->mv_dir&MV_DIR_BACKWARD){
733                     for(i=0; i<2; i++){
734                         put_bits(&s->pb, 1, s->field_select[1][i]);
735                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
736                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
737                         s->last_mv[1][i][0]=   s->mv[1][i][0];
738                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
739                     }
740                     s->b_count++;
741                 }
742             }
743             s->mv_bits += get_bits_diff(s);
744             if(cbp) {
745                 if (s->chroma_y_shift) {
746                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
747                 } else {
748                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
749                     put_bits(&s->pb, 2, cbp & 3);
750                 }
751             }
752         }
753         for(i=0;i<mb_block_count;i++) {
754             if (cbp & (1 << (mb_block_count - 1 - i))) {
755                 mpeg1_encode_block(s, block[i], i);
756             }
757         }
758         s->mb_skip_run = 0;
759         if(s->mb_intra)
760             s->i_tex_bits+= get_bits_diff(s);
761         else
762             s->p_tex_bits+= get_bits_diff(s);
763     }
764 }
765
766 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
767 {
768     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
769     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
770 }
771
772 // RAL: Parameter added: f_or_b_code
773 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
774 {
775     int code, bit_size, l, bits, range, sign;
776
777     if (val == 0) {
778         /* zero vector */
779         code = 0;
780         put_bits(&s->pb,
781                  mbMotionVectorTable[0][1],
782                  mbMotionVectorTable[0][0]);
783     } else {
784         bit_size = f_or_b_code - 1;
785         range = 1 << bit_size;
786         /* modulo encoding */
787         l= INT_BIT - 5 - bit_size;
788         val= (val<<l)>>l;
789
790         if (val >= 0) {
791             val--;
792             code = (val >> bit_size) + 1;
793             bits = val & (range - 1);
794             sign = 0;
795         } else {
796             val = -val;
797             val--;
798             code = (val >> bit_size) + 1;
799             bits = val & (range - 1);
800             sign = 1;
801         }
802
803         assert(code > 0 && code <= 16);
804
805         put_bits(&s->pb,
806                  mbMotionVectorTable[code][1],
807                  mbMotionVectorTable[code][0]);
808
809         put_bits(&s->pb, 1, sign);
810         if (bit_size > 0) {
811             put_bits(&s->pb, bit_size, bits);
812         }
813     }
814 }
815
816 void ff_mpeg1_encode_init(MpegEncContext *s)
817 {
818     static int done=0;
819
820     common_init(s);
821
822     if(!done){
823         int f_code;
824         int mv;
825         int i;
826
827         done=1;
828         init_rl(&rl_mpeg1, 1);
829         if(s->intra_vlc_format)
830             init_rl(&rl_mpeg2, 1);
831
832         for(i=0; i<64; i++)
833         {
834                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
835                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
836         }
837
838         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
839         if(s->intra_vlc_format)
840             init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
841
842         /* build unified dc encoding tables */
843         for(i=-255; i<256; i++)
844         {
845                 int adiff, index;
846                 int bits, code;
847                 int diff=i;
848
849                 adiff = FFABS(diff);
850                 if(diff<0) diff--;
851                 index = av_log2(2*adiff);
852
853                 bits= vlc_dc_lum_bits[index] + index;
854                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
855                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
856
857                 bits= vlc_dc_chroma_bits[index] + index;
858                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
859                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
860         }
861
862         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
863
864         for(f_code=1; f_code<=MAX_FCODE; f_code++){
865             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
866                 int len;
867
868                 if(mv==0) len= mbMotionVectorTable[0][1];
869                 else{
870                     int val, bit_size, range, code;
871
872                     bit_size = f_code - 1;
873                     range = 1 << bit_size;
874
875                     val=mv;
876                     if (val < 0)
877                         val = -val;
878                     val--;
879                     code = (val >> bit_size) + 1;
880                     if(code<17){
881                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
882                     }else{
883                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
884                     }
885                 }
886
887                 mv_penalty[f_code][mv+MAX_MV]= len;
888             }
889         }
890
891
892         for(f_code=MAX_FCODE; f_code>0; f_code--){
893             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
894                 fcode_tab[mv+MAX_MV]= f_code;
895             }
896         }
897     }
898     s->me.mv_penalty= mv_penalty;
899     s->fcode_tab= fcode_tab;
900     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
901         s->min_qcoeff=-255;
902         s->max_qcoeff= 255;
903     }else{
904         s->min_qcoeff=-2047;
905         s->max_qcoeff= 2047;
906     }
907     if (s->intra_vlc_format) {
908         s->intra_ac_vlc_length=
909         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
910     } else {
911         s->intra_ac_vlc_length=
912         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
913     }
914     s->inter_ac_vlc_length=
915     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
916 }
917
918 static inline void encode_dc(MpegEncContext *s, int diff, int component)
919 {
920   if(((unsigned) (diff+255)) >= 511){
921         int index;
922
923         if(diff<0){
924             index= av_log2_16bit(-2*diff);
925             diff--;
926         }else{
927             index= av_log2_16bit(2*diff);
928         }
929         if (component == 0) {
930             put_bits(
931                 &s->pb,
932                 vlc_dc_lum_bits[index] + index,
933                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
934         }else{
935             put_bits(
936                 &s->pb,
937                 vlc_dc_chroma_bits[index] + index,
938                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
939         }
940   }else{
941     if (component == 0) {
942         put_bits(
943             &s->pb,
944             mpeg1_lum_dc_uni[diff+255]&0xFF,
945             mpeg1_lum_dc_uni[diff+255]>>8);
946     } else {
947         put_bits(
948             &s->pb,
949             mpeg1_chr_dc_uni[diff+255]&0xFF,
950             mpeg1_chr_dc_uni[diff+255]>>8);
951     }
952   }
953 }
954
955 static void mpeg1_encode_block(MpegEncContext *s,
956                                DCTELEM *block,
957                                int n)
958 {
959     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
960     int code, component;
961     const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
962
963     last_index = s->block_last_index[n];
964
965     /* DC coef */
966     if (s->mb_intra) {
967         component = (n <= 3 ? 0 : (n&1) + 1);
968         dc = block[0]; /* overflow is impossible */
969         diff = dc - s->last_dc[component];
970         encode_dc(s, diff, component);
971         s->last_dc[component] = dc;
972         i = 1;
973         if (s->intra_vlc_format)
974             table_vlc = rl_mpeg2.table_vlc;
975     } else {
976         /* encode the first coefficient : needs to be done here because
977            it is handled slightly differently */
978         level = block[0];
979         if (abs(level) == 1) {
980                 code = ((uint32_t)level >> 31); /* the sign bit */
981                 put_bits(&s->pb, 2, code | 0x02);
982                 i = 1;
983         } else {
984             i = 0;
985             last_non_zero = -1;
986             goto next_coef;
987         }
988     }
989
990     /* now quantify & encode AC coefs */
991     last_non_zero = i - 1;
992
993     for(;i<=last_index;i++) {
994         j = s->intra_scantable.permutated[i];
995         level = block[j];
996     next_coef:
997 #if 0
998         if (level != 0)
999             dprintf(s->avctx, "level[%d]=%d\n", i, level);
1000 #endif
1001         /* encode using VLC */
1002         if (level != 0) {
1003             run = i - last_non_zero - 1;
1004
1005             alevel= level;
1006             MASK_ABS(sign, alevel)
1007             sign&=1;
1008
1009             if (alevel <= mpeg1_max_level[0][run]){
1010                 code= mpeg1_index_run[0][run] + alevel - 1;
1011                 /* store the vlc & sign at once */
1012                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
1013             } else {
1014                 /* escape seems to be pretty rare <5% so i dont optimize it */
1015                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
1016                 /* escape: only clip in this case */
1017                 put_bits(&s->pb, 6, run);
1018                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
1019                     if (alevel < 128) {
1020                         put_bits(&s->pb, 8, level & 0xff);
1021                     } else {
1022                         if (level < 0) {
1023                             put_bits(&s->pb, 16, 0x8001 + level + 255);
1024                         } else {
1025                             put_bits(&s->pb, 16, level & 0xffff);
1026                         }
1027                     }
1028                 }else{
1029                     put_bits(&s->pb, 12, level & 0xfff);
1030                 }
1031             }
1032             last_non_zero = i;
1033         }
1034     }
1035     /* end of block */
1036     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
1037 }
1038 #endif //CONFIG_ENCODERS
1039
1040 /******************************************/
1041 /* decoding */
1042
1043 static VLC dc_lum_vlc;
1044 static VLC dc_chroma_vlc;
1045 static VLC mv_vlc;
1046 static VLC mbincr_vlc;
1047 static VLC mb_ptype_vlc;
1048 static VLC mb_btype_vlc;
1049 static VLC mb_pat_vlc;
1050
1051 static void init_vlcs(void)
1052 {
1053     static int done = 0;
1054
1055     if (!done) {
1056         done = 1;
1057
1058         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1059                  vlc_dc_lum_bits, 1, 1,
1060                  vlc_dc_lum_code, 2, 2, 1);
1061         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1062                  vlc_dc_chroma_bits, 1, 1,
1063                  vlc_dc_chroma_code, 2, 2, 1);
1064         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1065                  &mbMotionVectorTable[0][1], 2, 1,
1066                  &mbMotionVectorTable[0][0], 2, 1, 1);
1067         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1068                  &mbAddrIncrTable[0][1], 2, 1,
1069                  &mbAddrIncrTable[0][0], 2, 1, 1);
1070         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1071                  &mbPatTable[0][1], 2, 1,
1072                  &mbPatTable[0][0], 2, 1, 1);
1073
1074         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1075                  &table_mb_ptype[0][1], 2, 1,
1076                  &table_mb_ptype[0][0], 2, 1, 1);
1077         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1078                  &table_mb_btype[0][1], 2, 1,
1079                  &table_mb_btype[0][0], 2, 1, 1);
1080         init_rl(&rl_mpeg1, 1);
1081         init_rl(&rl_mpeg2, 1);
1082
1083         init_2d_vlc_rl(&rl_mpeg1, 1);
1084         init_2d_vlc_rl(&rl_mpeg2, 1);
1085     }
1086 }
1087
1088 static inline int get_dmv(MpegEncContext *s)
1089 {
1090     if(get_bits1(&s->gb))
1091         return 1 - (get_bits1(&s->gb) << 1);
1092     else
1093         return 0;
1094 }
1095
1096 static inline int get_qscale(MpegEncContext *s)
1097 {
1098     int qscale = get_bits(&s->gb, 5);
1099     if (s->q_scale_type) {
1100         return non_linear_qscale[qscale];
1101     } else {
1102         return qscale << 1;
1103     }
1104 }
1105
1106 /* motion type (for mpeg2) */
1107 #define MT_FIELD 1
1108 #define MT_FRAME 2
1109 #define MT_16X8  2
1110 #define MT_DMV   3
1111
1112 static int mpeg_decode_mb(MpegEncContext *s,
1113                           DCTELEM block[12][64])
1114 {
1115     int i, j, k, cbp, val, mb_type, motion_type;
1116     const int mb_block_count = 4 + (1<< s->chroma_format);
1117
1118     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1119
1120     assert(s->mb_skipped==0);
1121
1122     if (s->mb_skip_run-- != 0) {
1123         if(s->pict_type == I_TYPE){
1124             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1125             return -1;
1126         }
1127
1128         /* skip mb */
1129         s->mb_intra = 0;
1130         for(i=0;i<12;i++)
1131             s->block_last_index[i] = -1;
1132         if(s->picture_structure == PICT_FRAME)
1133             s->mv_type = MV_TYPE_16X16;
1134         else
1135             s->mv_type = MV_TYPE_FIELD;
1136         if (s->pict_type == P_TYPE) {
1137             /* if P type, zero motion vector is implied */
1138             s->mv_dir = MV_DIR_FORWARD;
1139             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1140             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1141             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1142             s->field_select[0][0]= s->picture_structure - 1;
1143             s->mb_skipped = 1;
1144             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1145         } else {
1146             int mb_type;
1147
1148             if(s->mb_x)
1149                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1150             else
1151                 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,
1152             if(IS_INTRA(mb_type))
1153                 return -1;
1154
1155             /* if B type, reuse previous vectors and directions */
1156             s->mv[0][0][0] = s->last_mv[0][0][0];
1157             s->mv[0][0][1] = s->last_mv[0][0][1];
1158             s->mv[1][0][0] = s->last_mv[1][0][0];
1159             s->mv[1][0][1] = s->last_mv[1][0][1];
1160
1161             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1162                 mb_type | MB_TYPE_SKIP;
1163 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1164
1165             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1166                 s->mb_skipped = 1;
1167         }
1168
1169         return 0;
1170     }
1171
1172     switch(s->pict_type) {
1173     default:
1174     case I_TYPE:
1175         if (get_bits1(&s->gb) == 0) {
1176             if (get_bits1(&s->gb) == 0){
1177                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1178                 return -1;
1179             }
1180             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1181         } else {
1182             mb_type = MB_TYPE_INTRA;
1183         }
1184         break;
1185     case P_TYPE:
1186         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1187         if (mb_type < 0){
1188             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1189             return -1;
1190         }
1191         mb_type = ptype2mb_type[ mb_type ];
1192         break;
1193     case B_TYPE:
1194         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1195         if (mb_type < 0){
1196             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1197             return -1;
1198         }
1199         mb_type = btype2mb_type[ mb_type ];
1200         break;
1201     }
1202     dprintf(s->avctx, "mb_type=%x\n", mb_type);
1203 //    motion_type = 0; /* avoid warning */
1204     if (IS_INTRA(mb_type)) {
1205         s->dsp.clear_blocks(s->block[0]);
1206
1207         if(!s->chroma_y_shift){
1208             s->dsp.clear_blocks(s->block[6]);
1209         }
1210
1211         /* compute dct type */
1212         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1213             !s->frame_pred_frame_dct) {
1214             s->interlaced_dct = get_bits1(&s->gb);
1215         }
1216
1217         if (IS_QUANT(mb_type))
1218             s->qscale = get_qscale(s);
1219
1220         if (s->concealment_motion_vectors) {
1221             /* just parse them */
1222             if (s->picture_structure != PICT_FRAME)
1223                 skip_bits1(&s->gb); /* field select */
1224
1225             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1226                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1227             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1228                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1229
1230             skip_bits1(&s->gb); /* marker */
1231         }else
1232             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1233         s->mb_intra = 1;
1234 #ifdef HAVE_XVMC
1235         //one 1 we memcpy blocks in xvmcvideo
1236         if(s->avctx->xvmc_acceleration > 1){
1237             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1238             if(s->swap_uv){
1239                 exchange_uv(s);
1240             }
1241         }
1242 #endif
1243
1244         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1245             if(s->flags2 & CODEC_FLAG2_FAST){
1246                 for(i=0;i<6;i++) {
1247                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1248                 }
1249             }else{
1250                 for(i=0;i<mb_block_count;i++) {
1251                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1252                         return -1;
1253                 }
1254             }
1255         } else {
1256             for(i=0;i<6;i++) {
1257                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1258                     return -1;
1259             }
1260         }
1261     } else {
1262         if (mb_type & MB_TYPE_ZERO_MV){
1263             assert(mb_type & MB_TYPE_CBP);
1264
1265             /* compute dct type */
1266             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1267                 !s->frame_pred_frame_dct) {
1268                 s->interlaced_dct = get_bits1(&s->gb);
1269             }
1270
1271             if (IS_QUANT(mb_type))
1272                 s->qscale = get_qscale(s);
1273
1274             s->mv_dir = MV_DIR_FORWARD;
1275             if(s->picture_structure == PICT_FRAME)
1276                 s->mv_type = MV_TYPE_16X16;
1277             else{
1278                 s->mv_type = MV_TYPE_FIELD;
1279                 mb_type |= MB_TYPE_INTERLACED;
1280                 s->field_select[0][0]= s->picture_structure - 1;
1281             }
1282             s->last_mv[0][0][0] = 0;
1283             s->last_mv[0][0][1] = 0;
1284             s->last_mv[0][1][0] = 0;
1285             s->last_mv[0][1][1] = 0;
1286             s->mv[0][0][0] = 0;
1287             s->mv[0][0][1] = 0;
1288         }else{
1289             assert(mb_type & MB_TYPE_L0L1);
1290 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1291             /* get additionnal motion vector type */
1292             if (s->frame_pred_frame_dct)
1293                 motion_type = MT_FRAME;
1294             else{
1295                 motion_type = get_bits(&s->gb, 2);
1296             }
1297
1298             /* compute dct type */
1299             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1300                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1301                 s->interlaced_dct = get_bits1(&s->gb);
1302             }
1303
1304             if (IS_QUANT(mb_type))
1305                 s->qscale = get_qscale(s);
1306
1307             /* motion vectors */
1308             s->mv_dir = 0;
1309             for(i=0;i<2;i++) {
1310                 if (USES_LIST(mb_type, i)) {
1311                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1312                     dprintf(s->avctx, "motion_type=%d\n", motion_type);
1313                     switch(motion_type) {
1314                     case MT_FRAME: /* or MT_16X8 */
1315                         if (s->picture_structure == PICT_FRAME) {
1316                             /* MT_FRAME */
1317                             mb_type |= MB_TYPE_16x16;
1318                             s->mv_type = MV_TYPE_16X16;
1319                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1320                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1321                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1322                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1323                             /* full_pel: only for mpeg1 */
1324                             if (s->full_pel[i]){
1325                                 s->mv[i][0][0] <<= 1;
1326                                 s->mv[i][0][1] <<= 1;
1327                             }
1328                         } else {
1329                             /* MT_16X8 */
1330                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1331                             s->mv_type = MV_TYPE_16X8;
1332                             for(j=0;j<2;j++) {
1333                                 s->field_select[i][j] = get_bits1(&s->gb);
1334                                 for(k=0;k<2;k++) {
1335                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1336                                                              s->last_mv[i][j][k]);
1337                                     s->last_mv[i][j][k] = val;
1338                                     s->mv[i][j][k] = val;
1339                                 }
1340                             }
1341                         }
1342                         break;
1343                     case MT_FIELD:
1344                         s->mv_type = MV_TYPE_FIELD;
1345                         if (s->picture_structure == PICT_FRAME) {
1346                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1347                             for(j=0;j<2;j++) {
1348                                 s->field_select[i][j] = get_bits1(&s->gb);
1349                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1350                                                          s->last_mv[i][j][0]);
1351                                 s->last_mv[i][j][0] = val;
1352                                 s->mv[i][j][0] = val;
1353                                 dprintf(s->avctx, "fmx=%d\n", val);
1354                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1355                                                          s->last_mv[i][j][1] >> 1);
1356                                 s->last_mv[i][j][1] = val << 1;
1357                                 s->mv[i][j][1] = val;
1358                                 dprintf(s->avctx, "fmy=%d\n", val);
1359                             }
1360                         } else {
1361                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1362                             s->field_select[i][0] = get_bits1(&s->gb);
1363                             for(k=0;k<2;k++) {
1364                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1365                                                          s->last_mv[i][0][k]);
1366                                 s->last_mv[i][0][k] = val;
1367                                 s->last_mv[i][1][k] = val;
1368                                 s->mv[i][0][k] = val;
1369                             }
1370                         }
1371                         break;
1372                     case MT_DMV:
1373                         {
1374                             int dmx, dmy, mx, my, m;
1375
1376                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1377                                                     s->last_mv[i][0][0]);
1378                             s->last_mv[i][0][0] = mx;
1379                             s->last_mv[i][1][0] = mx;
1380                             dmx = get_dmv(s);
1381                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1382                                                     s->last_mv[i][0][1] >> 1);
1383                             dmy = get_dmv(s);
1384                             s->mv_type = MV_TYPE_DMV;
1385
1386
1387                             s->last_mv[i][0][1] = my<<1;
1388                             s->last_mv[i][1][1] = my<<1;
1389
1390                             s->mv[i][0][0] = mx;
1391                             s->mv[i][0][1] = my;
1392                             s->mv[i][1][0] = mx;//not used
1393                             s->mv[i][1][1] = my;//not used
1394
1395                             if (s->picture_structure == PICT_FRAME) {
1396                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1397
1398                                 //m = 1 + 2 * s->top_field_first;
1399                                 m = s->top_field_first ? 1 : 3;
1400
1401                                 /* top -> top pred */
1402                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1403                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1404                                 m = 4 - m;
1405                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1406                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1407                             } else {
1408                                 mb_type |= MB_TYPE_16x16;
1409
1410                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1411                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1412                                 if(s->picture_structure == PICT_TOP_FIELD)
1413                                     s->mv[i][2][1]--;
1414                                 else
1415                                     s->mv[i][2][1]++;
1416                             }
1417                         }
1418                         break;
1419                     default:
1420                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1421                         return -1;
1422                     }
1423                 }
1424             }
1425         }
1426
1427         s->mb_intra = 0;
1428         if (HAS_CBP(mb_type)) {
1429             s->dsp.clear_blocks(s->block[0]);
1430
1431             if(!s->chroma_y_shift){
1432                 s->dsp.clear_blocks(s->block[6]);
1433             }
1434
1435             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1436             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1437                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1438                 return -1;
1439             }
1440             if(mb_block_count > 6){
1441                  cbp<<= mb_block_count-6;
1442                  cbp |= get_bits(&s->gb, mb_block_count-6);
1443             }
1444
1445 #ifdef HAVE_XVMC
1446             //on 1 we memcpy blocks in xvmcvideo
1447             if(s->avctx->xvmc_acceleration > 1){
1448                 XVMC_pack_pblocks(s,cbp);
1449                 if(s->swap_uv){
1450                     exchange_uv(s);
1451                 }
1452             }
1453 #endif
1454
1455             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1456                 if(s->flags2 & CODEC_FLAG2_FAST){
1457                     for(i=0;i<6;i++) {
1458                         if(cbp & 32) {
1459                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1460                         } else {
1461                             s->block_last_index[i] = -1;
1462                         }
1463                         cbp+=cbp;
1464                     }
1465                 }else{
1466                     cbp<<= 12-mb_block_count;
1467
1468                     for(i=0;i<mb_block_count;i++) {
1469                         if ( cbp & (1<<11) ) {
1470                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1471                                 return -1;
1472                         } else {
1473                             s->block_last_index[i] = -1;
1474                         }
1475                         cbp+=cbp;
1476                     }
1477                 }
1478             } else {
1479                 if(s->flags2 & CODEC_FLAG2_FAST){
1480                     for(i=0;i<6;i++) {
1481                         if (cbp & 32) {
1482                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1483                         } else {
1484                             s->block_last_index[i] = -1;
1485                         }
1486                         cbp+=cbp;
1487                     }
1488                 }else{
1489                     for(i=0;i<6;i++) {
1490                         if (cbp & 32) {
1491                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1492                                 return -1;
1493                         } else {
1494                             s->block_last_index[i] = -1;
1495                         }
1496                         cbp+=cbp;
1497                     }
1498                 }
1499             }
1500         }else{
1501             for(i=0;i<12;i++)
1502                 s->block_last_index[i] = -1;
1503         }
1504     }
1505
1506     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1507
1508     return 0;
1509 }
1510
1511 /* as h263, but only 17 codes */
1512 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1513 {
1514     int code, sign, val, l, shift;
1515
1516     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1517     if (code == 0) {
1518         return pred;
1519     }
1520     if (code < 0) {
1521         return 0xffff;
1522     }
1523
1524     sign = get_bits1(&s->gb);
1525     shift = fcode - 1;
1526     val = code;
1527     if (shift) {
1528         val = (val - 1) << shift;
1529         val |= get_bits(&s->gb, shift);
1530         val++;
1531     }
1532     if (sign)
1533         val = -val;
1534     val += pred;
1535
1536     /* modulo decoding */
1537     l= INT_BIT - 5 - shift;
1538     val = (val<<l)>>l;
1539     return val;
1540 }
1541
1542 static inline int decode_dc(GetBitContext *gb, int component)
1543 {
1544     int code, diff;
1545
1546     if (component == 0) {
1547         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1548     } else {
1549         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1550     }
1551     if (code < 0){
1552         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1553         return 0xffff;
1554     }
1555     if (code == 0) {
1556         diff = 0;
1557     } else {
1558         diff = get_xbits(gb, code);
1559     }
1560     return diff;
1561 }
1562
1563 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1564                                DCTELEM *block,
1565                                int n)
1566 {
1567     int level, dc, diff, i, j, run;
1568     int component;
1569     RLTable *rl = &rl_mpeg1;
1570     uint8_t * const scantable= s->intra_scantable.permutated;
1571     const uint16_t *quant_matrix= s->intra_matrix;
1572     const int qscale= s->qscale;
1573
1574     /* DC coef */
1575     component = (n <= 3 ? 0 : n - 4 + 1);
1576     diff = decode_dc(&s->gb, component);
1577     if (diff >= 0xffff)
1578         return -1;
1579     dc = s->last_dc[component];
1580     dc += diff;
1581     s->last_dc[component] = dc;
1582     block[0] = dc<<3;
1583     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
1584     i = 0;
1585     {
1586         OPEN_READER(re, &s->gb);
1587         /* now quantify & encode AC coefs */
1588         for(;;) {
1589             UPDATE_CACHE(re, &s->gb);
1590             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1591
1592             if(level == 127){
1593                 break;
1594             } else if(level != 0) {
1595                 i += run;
1596                 j = scantable[i];
1597                 level= (level*qscale*quant_matrix[j])>>4;
1598                 level= (level-1)|1;
1599                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1600                 LAST_SKIP_BITS(re, &s->gb, 1);
1601             } else {
1602                 /* escape */
1603                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1604                 UPDATE_CACHE(re, &s->gb);
1605                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1606                 if (level == -128) {
1607                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1608                 } else if (level == 0) {
1609                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1610                 }
1611                 i += run;
1612                 j = scantable[i];
1613                 if(level<0){
1614                     level= -level;
1615                     level= (level*qscale*quant_matrix[j])>>4;
1616                     level= (level-1)|1;
1617                     level= -level;
1618                 }else{
1619                     level= (level*qscale*quant_matrix[j])>>4;
1620                     level= (level-1)|1;
1621                 }
1622             }
1623             if (i > 63){
1624                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1625                 return -1;
1626             }
1627
1628             block[j] = level;
1629         }
1630         CLOSE_READER(re, &s->gb);
1631     }
1632     s->block_last_index[n] = i;
1633    return 0;
1634 }
1635
1636 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1637                                DCTELEM *block,
1638                                int n)
1639 {
1640     int level, i, j, run;
1641     RLTable *rl = &rl_mpeg1;
1642     uint8_t * const scantable= s->intra_scantable.permutated;
1643     const uint16_t *quant_matrix= s->inter_matrix;
1644     const int qscale= s->qscale;
1645
1646     {
1647         OPEN_READER(re, &s->gb);
1648         i = -1;
1649         /* special case for the first coef. no need to add a second vlc table */
1650         UPDATE_CACHE(re, &s->gb);
1651         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1652             level= (3*qscale*quant_matrix[0])>>5;
1653             level= (level-1)|1;
1654             if(GET_CACHE(re, &s->gb)&0x40000000)
1655                 level= -level;
1656             block[0] = level;
1657             i++;
1658             SKIP_BITS(re, &s->gb, 2);
1659             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1660                 goto end;
1661         }
1662
1663         /* now quantify & encode AC coefs */
1664         for(;;) {
1665             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1666
1667             if(level != 0) {
1668                 i += run;
1669                 j = scantable[i];
1670                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1671                 level= (level-1)|1;
1672                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1673                 SKIP_BITS(re, &s->gb, 1);
1674             } else {
1675                 /* escape */
1676                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1677                 UPDATE_CACHE(re, &s->gb);
1678                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1679                 if (level == -128) {
1680                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1681                 } else if (level == 0) {
1682                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1683                 }
1684                 i += run;
1685                 j = scantable[i];
1686                 if(level<0){
1687                     level= -level;
1688                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1689                     level= (level-1)|1;
1690                     level= -level;
1691                 }else{
1692                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1693                     level= (level-1)|1;
1694                 }
1695             }
1696             if (i > 63){
1697                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1698                 return -1;
1699             }
1700
1701             block[j] = level;
1702             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1703                 break;
1704             UPDATE_CACHE(re, &s->gb);
1705         }
1706 end:
1707         LAST_SKIP_BITS(re, &s->gb, 2);
1708         CLOSE_READER(re, &s->gb);
1709     }
1710     s->block_last_index[n] = i;
1711     return 0;
1712 }
1713
1714 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1715 {
1716     int level, i, j, run;
1717     RLTable *rl = &rl_mpeg1;
1718     uint8_t * const scantable= s->intra_scantable.permutated;
1719     const int qscale= s->qscale;
1720
1721     {
1722         OPEN_READER(re, &s->gb);
1723         i = -1;
1724         /* special case for the first coef. no need to add a second vlc table */
1725         UPDATE_CACHE(re, &s->gb);
1726         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1727             level= (3*qscale)>>1;
1728             level= (level-1)|1;
1729             if(GET_CACHE(re, &s->gb)&0x40000000)
1730                 level= -level;
1731             block[0] = level;
1732             i++;
1733             SKIP_BITS(re, &s->gb, 2);
1734             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1735                 goto end;
1736         }
1737
1738         /* now quantify & encode AC coefs */
1739         for(;;) {
1740             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1741
1742             if(level != 0) {
1743                 i += run;
1744                 j = scantable[i];
1745                 level= ((level*2+1)*qscale)>>1;
1746                 level= (level-1)|1;
1747                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1748                 SKIP_BITS(re, &s->gb, 1);
1749             } else {
1750                 /* escape */
1751                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1752                 UPDATE_CACHE(re, &s->gb);
1753                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1754                 if (level == -128) {
1755                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1756                 } else if (level == 0) {
1757                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1758                 }
1759                 i += run;
1760                 j = scantable[i];
1761                 if(level<0){
1762                     level= -level;
1763                     level= ((level*2+1)*qscale)>>1;
1764                     level= (level-1)|1;
1765                     level= -level;
1766                 }else{
1767                     level= ((level*2+1)*qscale)>>1;
1768                     level= (level-1)|1;
1769                 }
1770             }
1771
1772             block[j] = level;
1773             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1774                 break;
1775             UPDATE_CACHE(re, &s->gb);
1776         }
1777 end:
1778         LAST_SKIP_BITS(re, &s->gb, 2);
1779         CLOSE_READER(re, &s->gb);
1780     }
1781     s->block_last_index[n] = i;
1782     return 0;
1783 }
1784
1785
1786 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1787                                DCTELEM *block,
1788                                int n)
1789 {
1790     int level, i, j, run;
1791     RLTable *rl = &rl_mpeg1;
1792     uint8_t * const scantable= s->intra_scantable.permutated;
1793     const uint16_t *quant_matrix;
1794     const int qscale= s->qscale;
1795     int mismatch;
1796
1797     mismatch = 1;
1798
1799     {
1800         OPEN_READER(re, &s->gb);
1801         i = -1;
1802         if (n < 4)
1803             quant_matrix = s->inter_matrix;
1804         else
1805             quant_matrix = s->chroma_inter_matrix;
1806
1807         /* special case for the first coef. no need to add a second vlc table */
1808         UPDATE_CACHE(re, &s->gb);
1809         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1810             level= (3*qscale*quant_matrix[0])>>5;
1811             if(GET_CACHE(re, &s->gb)&0x40000000)
1812                 level= -level;
1813             block[0] = level;
1814             mismatch ^= level;
1815             i++;
1816             SKIP_BITS(re, &s->gb, 2);
1817             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1818                 goto end;
1819         }
1820
1821         /* now quantify & encode AC coefs */
1822         for(;;) {
1823             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1824
1825             if(level != 0) {
1826                 i += run;
1827                 j = scantable[i];
1828                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1829                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1830                 SKIP_BITS(re, &s->gb, 1);
1831             } else {
1832                 /* escape */
1833                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1834                 UPDATE_CACHE(re, &s->gb);
1835                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1836
1837                 i += run;
1838                 j = scantable[i];
1839                 if(level<0){
1840                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1841                     level= -level;
1842                 }else{
1843                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1844                 }
1845             }
1846             if (i > 63){
1847                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1848                 return -1;
1849             }
1850
1851             mismatch ^= level;
1852             block[j] = level;
1853             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1854                 break;
1855             UPDATE_CACHE(re, &s->gb);
1856         }
1857 end:
1858         LAST_SKIP_BITS(re, &s->gb, 2);
1859         CLOSE_READER(re, &s->gb);
1860     }
1861     block[63] ^= (mismatch & 1);
1862
1863     s->block_last_index[n] = i;
1864     return 0;
1865 }
1866
1867 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1868                                DCTELEM *block,
1869                                int n)
1870 {
1871     int level, i, j, run;
1872     RLTable *rl = &rl_mpeg1;
1873     uint8_t * const scantable= s->intra_scantable.permutated;
1874     const int qscale= s->qscale;
1875     OPEN_READER(re, &s->gb);
1876     i = -1;
1877
1878     /* special case for the first coef. no need to add a second vlc table */
1879     UPDATE_CACHE(re, &s->gb);
1880     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1881         level= (3*qscale)>>1;
1882         if(GET_CACHE(re, &s->gb)&0x40000000)
1883             level= -level;
1884         block[0] = level;
1885         i++;
1886         SKIP_BITS(re, &s->gb, 2);
1887         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1888             goto end;
1889     }
1890
1891     /* now quantify & encode AC coefs */
1892     for(;;) {
1893         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1894
1895         if(level != 0) {
1896             i += run;
1897             j = scantable[i];
1898             level= ((level*2+1)*qscale)>>1;
1899             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1900             SKIP_BITS(re, &s->gb, 1);
1901         } else {
1902             /* escape */
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);
1906
1907             i += run;
1908             j = scantable[i];
1909             if(level<0){
1910                 level= ((-level*2+1)*qscale)>>1;
1911                 level= -level;
1912             }else{
1913                 level= ((level*2+1)*qscale)>>1;
1914             }
1915         }
1916
1917         block[j] = level;
1918         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1919             break;
1920         UPDATE_CACHE(re, &s->gb);
1921     }
1922 end:
1923     LAST_SKIP_BITS(re, &s->gb, 2);
1924     CLOSE_READER(re, &s->gb);
1925     s->block_last_index[n] = i;
1926     return 0;
1927 }
1928
1929
1930 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1931                                DCTELEM *block,
1932                                int n)
1933 {
1934     int level, dc, diff, i, j, run;
1935     int component;
1936     RLTable *rl;
1937     uint8_t * const scantable= s->intra_scantable.permutated;
1938     const uint16_t *quant_matrix;
1939     const int qscale= s->qscale;
1940     int mismatch;
1941
1942     /* DC coef */
1943     if (n < 4){
1944         quant_matrix = s->intra_matrix;
1945         component = 0;
1946     }else{
1947         quant_matrix = s->chroma_intra_matrix;
1948         component = (n&1) + 1;
1949     }
1950     diff = decode_dc(&s->gb, component);
1951     if (diff >= 0xffff)
1952         return -1;
1953     dc = s->last_dc[component];
1954     dc += diff;
1955     s->last_dc[component] = dc;
1956     block[0] = dc << (3 - s->intra_dc_precision);
1957     dprintf(s->avctx, "dc=%d\n", block[0]);
1958     mismatch = block[0] ^ 1;
1959     i = 0;
1960     if (s->intra_vlc_format)
1961         rl = &rl_mpeg2;
1962     else
1963         rl = &rl_mpeg1;
1964
1965     {
1966         OPEN_READER(re, &s->gb);
1967         /* now quantify & encode AC coefs */
1968         for(;;) {
1969             UPDATE_CACHE(re, &s->gb);
1970             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1971
1972             if(level == 127){
1973                 break;
1974             } else if(level != 0) {
1975                 i += run;
1976                 j = scantable[i];
1977                 level= (level*qscale*quant_matrix[j])>>4;
1978                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1979                 LAST_SKIP_BITS(re, &s->gb, 1);
1980             } else {
1981                 /* escape */
1982                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1983                 UPDATE_CACHE(re, &s->gb);
1984                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1985                 i += run;
1986                 j = scantable[i];
1987                 if(level<0){
1988                     level= (-level*qscale*quant_matrix[j])>>4;
1989                     level= -level;
1990                 }else{
1991                     level= (level*qscale*quant_matrix[j])>>4;
1992                 }
1993             }
1994             if (i > 63){
1995                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1996                 return -1;
1997             }
1998
1999             mismatch^= level;
2000             block[j] = level;
2001         }
2002         CLOSE_READER(re, &s->gb);
2003     }
2004     block[63]^= mismatch&1;
2005
2006     s->block_last_index[n] = i;
2007     return 0;
2008 }
2009
2010 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
2011                                DCTELEM *block,
2012                                int n)
2013 {
2014     int level, dc, diff, j, run;
2015     int component;
2016     RLTable *rl;
2017     uint8_t * scantable= s->intra_scantable.permutated;
2018     const uint16_t *quant_matrix;
2019     const int qscale= s->qscale;
2020
2021     /* DC coef */
2022     if (n < 4){
2023         quant_matrix = s->intra_matrix;
2024         component = 0;
2025     }else{
2026         quant_matrix = s->chroma_intra_matrix;
2027         component = (n&1) + 1;
2028     }
2029     diff = decode_dc(&s->gb, component);
2030     if (diff >= 0xffff)
2031         return -1;
2032     dc = s->last_dc[component];
2033     dc += diff;
2034     s->last_dc[component] = dc;
2035     block[0] = dc << (3 - s->intra_dc_precision);
2036     if (s->intra_vlc_format)
2037         rl = &rl_mpeg2;
2038     else
2039         rl = &rl_mpeg1;
2040
2041     {
2042         OPEN_READER(re, &s->gb);
2043         /* now quantify & encode AC coefs */
2044         for(;;) {
2045             UPDATE_CACHE(re, &s->gb);
2046             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2047
2048             if(level == 127){
2049                 break;
2050             } else if(level != 0) {
2051                 scantable += run;
2052                 j = *scantable;
2053                 level= (level*qscale*quant_matrix[j])>>4;
2054                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2055                 LAST_SKIP_BITS(re, &s->gb, 1);
2056             } else {
2057                 /* escape */
2058                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2059                 UPDATE_CACHE(re, &s->gb);
2060                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2061                 scantable += run;
2062                 j = *scantable;
2063                 if(level<0){
2064                     level= (-level*qscale*quant_matrix[j])>>4;
2065                     level= -level;
2066                 }else{
2067                     level= (level*qscale*quant_matrix[j])>>4;
2068                 }
2069             }
2070
2071             block[j] = level;
2072         }
2073         CLOSE_READER(re, &s->gb);
2074     }
2075
2076     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2077     return 0;
2078 }
2079
2080 typedef struct Mpeg1Context {
2081     MpegEncContext mpeg_enc_ctx;
2082     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2083     int repeat_field; /* true if we must repeat the field */
2084     AVPanScan pan_scan; /** some temporary storage for the panscan */
2085     int slice_count;
2086     int swap_uv;//indicate VCR2
2087     int save_aspect_info;
2088     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2089
2090 } Mpeg1Context;
2091
2092 static int mpeg_decode_init(AVCodecContext *avctx)
2093 {
2094     Mpeg1Context *s = avctx->priv_data;
2095     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2096     int i;
2097
2098     //we need some parmutation to store
2099     //matrixes, until MPV_common_init()
2100     //set the real permutatuon
2101     for(i=0;i<64;i++)
2102        s2->dsp.idct_permutation[i]=i;
2103
2104     MPV_decode_defaults(s2);
2105
2106     s->mpeg_enc_ctx.avctx= avctx;
2107     s->mpeg_enc_ctx.flags= avctx->flags;
2108     s->mpeg_enc_ctx.flags2= avctx->flags2;
2109     common_init(&s->mpeg_enc_ctx);
2110     init_vlcs();
2111
2112     s->mpeg_enc_ctx_allocated = 0;
2113     s->mpeg_enc_ctx.picture_number = 0;
2114     s->repeat_field = 0;
2115     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2116     return 0;
2117 }
2118
2119 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2120                                      const uint8_t *new_perm){
2121     uint16_t temp_matrix[64];
2122     int i;
2123
2124     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2125
2126     for(i=0;i<64;i++){
2127         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2128     }
2129 }
2130
2131 //Call this function when we know all parameters
2132 //it may be called in different places for mpeg1 and mpeg2
2133 static int mpeg_decode_postinit(AVCodecContext *avctx){
2134     Mpeg1Context *s1 = avctx->priv_data;
2135     MpegEncContext *s = &s1->mpeg_enc_ctx;
2136     uint8_t old_permutation[64];
2137
2138     if (
2139         (s1->mpeg_enc_ctx_allocated == 0)||
2140         avctx->coded_width  != s->width ||
2141         avctx->coded_height != s->height||
2142         s1->save_aspect_info != s->aspect_ratio_info||
2143         0)
2144     {
2145
2146         if (s1->mpeg_enc_ctx_allocated) {
2147             ParseContext pc= s->parse_context;
2148             s->parse_context.buffer=0;
2149             MPV_common_end(s);
2150             s->parse_context= pc;
2151         }
2152
2153         if( (s->width == 0 )||(s->height == 0))
2154             return -2;
2155
2156         avcodec_set_dimensions(avctx, s->width, s->height);
2157         avctx->bit_rate = s->bit_rate;
2158         s1->save_aspect_info = s->aspect_ratio_info;
2159
2160      //low_delay may be forced, in this case we will have B frames
2161      //that behave like P frames
2162         avctx->has_b_frames = !(s->low_delay);
2163
2164         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2165             //mpeg1 fps
2166             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2167             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2168             //mpeg1 aspect
2169             avctx->sample_aspect_ratio= av_d2q(
2170                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2171
2172         }else{//mpeg2
2173         //mpeg2 fps
2174             av_reduce(
2175                 &s->avctx->time_base.den,
2176                 &s->avctx->time_base.num,
2177                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2178                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2179                 1<<30);
2180         //mpeg2 aspect
2181             if(s->aspect_ratio_info > 1){
2182                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2183                     s->avctx->sample_aspect_ratio=
2184                         av_div_q(
2185                          mpeg2_aspect[s->aspect_ratio_info],
2186                          (AVRational){s->width, s->height}
2187                          );
2188                 }else{
2189                     s->avctx->sample_aspect_ratio=
2190                         av_div_q(
2191                          mpeg2_aspect[s->aspect_ratio_info],
2192                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2193                         );
2194                 }
2195             }else{
2196                 s->avctx->sample_aspect_ratio=
2197                     mpeg2_aspect[s->aspect_ratio_info];
2198             }
2199         }//mpeg2
2200
2201         if(avctx->xvmc_acceleration){
2202             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2203         }else{
2204             if(s->chroma_format <  2){
2205                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2206             }else
2207             if(s->chroma_format == 2){
2208                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2209             }else
2210             if(s->chroma_format >  2){
2211                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2212             }
2213         }
2214         //until then pix_fmt may be changed right after codec init
2215         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2216             if( avctx->idct_algo == FF_IDCT_AUTO )
2217                 avctx->idct_algo = FF_IDCT_SIMPLE;
2218
2219         //quantization matrixes may need reordering
2220         //if dct permutation is changed
2221         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2222
2223         if (MPV_common_init(s) < 0)
2224             return -2;
2225
2226         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2227         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2228         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2229         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2230
2231         s1->mpeg_enc_ctx_allocated = 1;
2232     }
2233     return 0;
2234 }
2235
2236 static int mpeg1_decode_picture(AVCodecContext *avctx,
2237                                 const uint8_t *buf, int buf_size)
2238 {
2239     Mpeg1Context *s1 = avctx->priv_data;
2240     MpegEncContext *s = &s1->mpeg_enc_ctx;
2241     int ref, f_code, vbv_delay;
2242
2243     if(mpeg_decode_postinit(s->avctx) < 0)
2244        return -2;
2245
2246     init_get_bits(&s->gb, buf, buf_size*8);
2247
2248     ref = get_bits(&s->gb, 10); /* temporal ref */
2249     s->pict_type = get_bits(&s->gb, 3);
2250     if(s->pict_type == 0 || s->pict_type > 3)
2251         return -1;
2252
2253     vbv_delay= get_bits(&s->gb, 16);
2254     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2255         s->full_pel[0] = get_bits1(&s->gb);
2256         f_code = get_bits(&s->gb, 3);
2257         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2258             return -1;
2259         s->mpeg_f_code[0][0] = f_code;
2260         s->mpeg_f_code[0][1] = f_code;
2261     }
2262     if (s->pict_type == B_TYPE) {
2263         s->full_pel[1] = get_bits1(&s->gb);
2264         f_code = get_bits(&s->gb, 3);
2265         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2266             return -1;
2267         s->mpeg_f_code[1][0] = f_code;
2268         s->mpeg_f_code[1][1] = f_code;
2269     }
2270     s->current_picture.pict_type= s->pict_type;
2271     s->current_picture.key_frame= s->pict_type == I_TYPE;
2272
2273     if(avctx->debug & FF_DEBUG_PICT_INFO)
2274         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2275
2276     s->y_dc_scale = 8;
2277     s->c_dc_scale = 8;
2278     s->first_slice = 1;
2279     return 0;
2280 }
2281
2282 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2283 {
2284     MpegEncContext *s= &s1->mpeg_enc_ctx;
2285     int horiz_size_ext, vert_size_ext;
2286     int bit_rate_ext;
2287
2288     skip_bits(&s->gb, 1); /* profil and level esc*/
2289     s->avctx->profile= get_bits(&s->gb, 3);
2290     s->avctx->level= get_bits(&s->gb, 4);
2291     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2292     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2293     horiz_size_ext = get_bits(&s->gb, 2);
2294     vert_size_ext = get_bits(&s->gb, 2);
2295     s->width |= (horiz_size_ext << 12);
2296     s->height |= (vert_size_ext << 12);
2297     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2298     s->bit_rate += (bit_rate_ext << 18) * 400;
2299     skip_bits1(&s->gb); /* marker */
2300     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2301
2302     s->low_delay = get_bits1(&s->gb);
2303     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2304
2305     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2306     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2307
2308     dprintf(s->avctx, "sequence extension\n");
2309     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2310     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2311
2312     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2313         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2314                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2315
2316 }
2317
2318 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2319 {
2320     MpegEncContext *s= &s1->mpeg_enc_ctx;
2321     int color_description, w, h;
2322
2323     skip_bits(&s->gb, 3); /* video format */
2324     color_description= get_bits1(&s->gb);
2325     if(color_description){
2326         skip_bits(&s->gb, 8); /* color primaries */
2327         skip_bits(&s->gb, 8); /* transfer_characteristics */
2328         skip_bits(&s->gb, 8); /* matrix_coefficients */
2329     }
2330     w= get_bits(&s->gb, 14);
2331     skip_bits(&s->gb, 1); //marker
2332     h= get_bits(&s->gb, 14);
2333     skip_bits(&s->gb, 1); //marker
2334
2335     s1->pan_scan.width= 16*w;
2336     s1->pan_scan.height=16*h;
2337
2338     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2339         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2340 }
2341
2342 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2343 {
2344     MpegEncContext *s= &s1->mpeg_enc_ctx;
2345     int i,nofco;
2346
2347     nofco = 1;
2348     if(s->progressive_sequence){
2349         if(s->repeat_first_field){
2350             nofco++;
2351             if(s->top_field_first)
2352                 nofco++;
2353         }
2354     }else{
2355         if(s->picture_structure == PICT_FRAME){
2356             nofco++;
2357             if(s->repeat_first_field)
2358                 nofco++;
2359         }
2360     }
2361     for(i=0; i<nofco; i++){
2362         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2363         skip_bits(&s->gb, 1); //marker
2364         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2365         skip_bits(&s->gb, 1); //marker
2366     }
2367
2368     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2369         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2370             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2371             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2372             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2373         );
2374 }
2375
2376 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2377 {
2378     int i, v, j;
2379
2380     dprintf(s->avctx, "matrix extension\n");
2381
2382     if (get_bits1(&s->gb)) {
2383         for(i=0;i<64;i++) {
2384             v = get_bits(&s->gb, 8);
2385             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2386             s->intra_matrix[j] = v;
2387             s->chroma_intra_matrix[j] = v;
2388         }
2389     }
2390     if (get_bits1(&s->gb)) {
2391         for(i=0;i<64;i++) {
2392             v = get_bits(&s->gb, 8);
2393             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2394             s->inter_matrix[j] = v;
2395             s->chroma_inter_matrix[j] = v;
2396         }
2397     }
2398     if (get_bits1(&s->gb)) {
2399         for(i=0;i<64;i++) {
2400             v = get_bits(&s->gb, 8);
2401             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2402             s->chroma_intra_matrix[j] = v;
2403         }
2404     }
2405     if (get_bits1(&s->gb)) {
2406         for(i=0;i<64;i++) {
2407             v = get_bits(&s->gb, 8);
2408             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2409             s->chroma_inter_matrix[j] = v;
2410         }
2411     }
2412 }
2413
2414 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2415 {
2416     s->full_pel[0] = s->full_pel[1] = 0;
2417     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2418     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2419     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2420     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2421     s->intra_dc_precision = get_bits(&s->gb, 2);
2422     s->picture_structure = get_bits(&s->gb, 2);
2423     s->top_field_first = get_bits1(&s->gb);
2424     s->frame_pred_frame_dct = get_bits1(&s->gb);
2425     s->concealment_motion_vectors = get_bits1(&s->gb);
2426     s->q_scale_type = get_bits1(&s->gb);
2427     s->intra_vlc_format = get_bits1(&s->gb);
2428     s->alternate_scan = get_bits1(&s->gb);
2429     s->repeat_first_field = get_bits1(&s->gb);
2430     s->chroma_420_type = get_bits1(&s->gb);
2431     s->progressive_frame = get_bits1(&s->gb);
2432
2433     if(s->picture_structure == PICT_FRAME){
2434         s->first_field=0;
2435         s->v_edge_pos= 16*s->mb_height;
2436     }else{
2437         s->first_field ^= 1;
2438         s->v_edge_pos=  8*s->mb_height;
2439         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2440     }
2441
2442     if(s->alternate_scan){
2443         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2444         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2445     }else{
2446         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2447         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2448     }
2449
2450     /* composite display not parsed */
2451     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
2452     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
2453     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
2454     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
2455     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
2456     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
2457     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
2458     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2459     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
2460 }
2461
2462 static void mpeg_decode_extension(AVCodecContext *avctx,
2463                                   const uint8_t *buf, int buf_size)
2464 {
2465     Mpeg1Context *s1 = avctx->priv_data;
2466     MpegEncContext *s = &s1->mpeg_enc_ctx;
2467     int ext_type;
2468
2469     init_get_bits(&s->gb, buf, buf_size*8);
2470
2471     ext_type = get_bits(&s->gb, 4);
2472     switch(ext_type) {
2473     case 0x1:
2474         mpeg_decode_sequence_extension(s1);
2475         break;
2476     case 0x2:
2477         mpeg_decode_sequence_display_extension(s1);
2478         break;
2479     case 0x3:
2480         mpeg_decode_quant_matrix_extension(s);
2481         break;
2482     case 0x7:
2483         mpeg_decode_picture_display_extension(s1);
2484         break;
2485     case 0x8:
2486         mpeg_decode_picture_coding_extension(s);
2487         break;
2488     }
2489 }
2490
2491 static void exchange_uv(MpegEncContext *s){
2492     short * tmp = s->pblocks[4];
2493     s->pblocks[4] = s->pblocks[5];
2494     s->pblocks[5] = tmp;
2495 }
2496
2497 static int mpeg_field_start(MpegEncContext *s){
2498     AVCodecContext *avctx= s->avctx;
2499     Mpeg1Context *s1 = (Mpeg1Context*)s;
2500
2501     /* start frame decoding */
2502     if(s->first_field || s->picture_structure==PICT_FRAME){
2503         if(MPV_frame_start(s, avctx) < 0)
2504             return -1;
2505
2506         ff_er_frame_start(s);
2507
2508         /* first check if we must repeat the frame */
2509         s->current_picture_ptr->repeat_pict = 0;
2510         if (s->repeat_first_field) {
2511             if (s->progressive_sequence) {
2512                 if (s->top_field_first)
2513                     s->current_picture_ptr->repeat_pict = 4;
2514                 else
2515                     s->current_picture_ptr->repeat_pict = 2;
2516             } else if (s->progressive_frame) {
2517                 s->current_picture_ptr->repeat_pict = 1;
2518             }
2519         }
2520
2521         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2522     }else{ //second field
2523             int i;
2524
2525             if(!s->current_picture_ptr){
2526                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2527                 return -1;
2528             }
2529
2530             for(i=0; i<4; i++){
2531                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2532                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2533                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2534                 }
2535             }
2536     }
2537 #ifdef HAVE_XVMC
2538 // MPV_frame_start will call this function too,
2539 // but we need to call it on every field
2540     if(s->avctx->xvmc_acceleration)
2541          XVMC_field_start(s,avctx);
2542 #endif
2543
2544     return 0;
2545 }
2546
2547 #define DECODE_SLICE_ERROR -1
2548 #define DECODE_SLICE_OK 0
2549
2550 /**
2551  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2552  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2553  *         DECODE_SLICE_OK if this slice is ok<br>
2554  */
2555 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2556                              const uint8_t **buf, int buf_size)
2557 {
2558     MpegEncContext *s = &s1->mpeg_enc_ctx;
2559     AVCodecContext *avctx= s->avctx;
2560     int ret;
2561     const int field_pic= s->picture_structure != PICT_FRAME;
2562     const int lowres= s->avctx->lowres;
2563
2564     s->resync_mb_x=
2565     s->resync_mb_y= -1;
2566
2567     if (mb_y<<field_pic >= s->mb_height){
2568         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2569         return -1;
2570     }
2571
2572     init_get_bits(&s->gb, *buf, buf_size*8);
2573
2574     ff_mpeg1_clean_buffers(s);
2575     s->interlaced_dct = 0;
2576
2577     s->qscale = get_qscale(s);
2578
2579     if(s->qscale == 0){
2580         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2581         return -1;
2582     }
2583
2584     /* extra slice info */
2585     while (get_bits1(&s->gb) != 0) {
2586         skip_bits(&s->gb, 8);
2587     }
2588
2589     s->mb_x=0;
2590
2591     for(;;) {
2592         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2593         if (code < 0){
2594             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2595             return -1;
2596         }
2597         if (code >= 33) {
2598             if (code == 33) {
2599                 s->mb_x += 33;
2600             }
2601             /* otherwise, stuffing, nothing to do */
2602         } else {
2603             s->mb_x += code;
2604             break;
2605         }
2606     }
2607     if(s->mb_x >= (unsigned)s->mb_width){
2608         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
2609         return -1;
2610     }
2611
2612     s->resync_mb_x= s->mb_x;
2613     s->resync_mb_y= s->mb_y= mb_y;
2614     s->mb_skip_run= 0;
2615     ff_init_block_index(s);
2616
2617     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2618         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2619              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",
2620                  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],
2621                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2622                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2623                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2624                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2625         }
2626     }
2627
2628     for(;;) {
2629 #ifdef HAVE_XVMC
2630         //one 1 we memcpy blocks in xvmcvideo
2631         if(s->avctx->xvmc_acceleration > 1)
2632             XVMC_init_block(s);//set s->block
2633 #endif
2634
2635         ret = mpeg_decode_mb(s, s->block);
2636         s->chroma_qscale= s->qscale;
2637
2638         dprintf(s->avctx, "ret=%d\n", ret);
2639         if (ret < 0)
2640             return -1;
2641
2642         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2643             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2644             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2645             int motion_x, motion_y, dir, i;
2646             if(field_pic && !s->first_field)
2647                 xy += wrap/2;
2648
2649             for(i=0; i<2; i++){
2650                 for(dir=0; dir<2; dir++){
2651                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2652                         motion_x = motion_y = 0;
2653                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2654                         motion_x = s->mv[dir][0][0];
2655                         motion_y = s->mv[dir][0][1];
2656                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2657                         motion_x = s->mv[dir][i][0];
2658                         motion_y = s->mv[dir][i][1];
2659                     }
2660
2661                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2662                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2663                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2664                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2665                     s->current_picture.ref_index [dir][xy    ]=
2666                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2667                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2668                 }
2669                 xy += wrap;
2670             }
2671         }
2672
2673         s->dest[0] += 16 >> lowres;
2674         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2675         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2676
2677         MPV_decode_mb(s, s->block);
2678
2679         if (++s->mb_x >= s->mb_width) {
2680             const int mb_size= 16>>s->avctx->lowres;
2681
2682             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2683
2684             s->mb_x = 0;
2685             s->mb_y++;
2686
2687             if(s->mb_y<<field_pic >= s->mb_height){
2688                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2689                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2690                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2691                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2692
2693                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2694                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2695                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2696                     return -1;
2697                 }else
2698                     goto eos;
2699             }
2700
2701             ff_init_block_index(s);
2702         }
2703
2704         /* skip mb handling */
2705         if (s->mb_skip_run == -1) {
2706             /* read again increment */
2707             s->mb_skip_run = 0;
2708             for(;;) {
2709                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2710                 if (code < 0){
2711                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2712                     return -1;
2713                 }
2714                 if (code >= 33) {
2715                     if (code == 33) {
2716                         s->mb_skip_run += 33;
2717                     }else if(code == 35){
2718                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2719                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2720                             return -1;
2721                         }
2722                         goto eos; /* end of slice */
2723                     }
2724                     /* otherwise, stuffing, nothing to do */
2725                 } else {
2726                     s->mb_skip_run += code;
2727                     break;
2728                 }
2729             }
2730         }
2731     }
2732 eos: // end of slice
2733     *buf += get_bits_count(&s->gb)/8 - 1;
2734 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2735     return 0;
2736 }
2737
2738 static int slice_decode_thread(AVCodecContext *c, void *arg){
2739     MpegEncContext *s= arg;
2740     const uint8_t *buf= s->gb.buffer;
2741     int mb_y= s->start_mb_y;
2742
2743     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2744
2745     for(;;){
2746         uint32_t start_code;
2747         int ret;
2748
2749         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2750         emms_c();
2751 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2752 //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);
2753         if(ret < 0){
2754             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2755                 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);
2756         }else{
2757             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);
2758         }
2759
2760         if(s->mb_y == s->end_mb_y)
2761             return 0;
2762
2763         start_code= -1;
2764         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2765         mb_y= start_code - SLICE_MIN_START_CODE;
2766         if(mb_y < 0 || mb_y >= s->end_mb_y)
2767             return -1;
2768     }
2769
2770     return 0; //not reached
2771 }
2772
2773 /**
2774  * handles slice ends.
2775  * @return 1 if it seems to be the last slice of
2776  */
2777 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2778 {
2779     Mpeg1Context *s1 = avctx->priv_data;
2780     MpegEncContext *s = &s1->mpeg_enc_ctx;
2781
2782     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2783         return 0;
2784
2785 #ifdef HAVE_XVMC
2786     if(s->avctx->xvmc_acceleration)
2787         XVMC_field_end(s);
2788 #endif
2789     /* end of slice reached */
2790     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2791         /* end of image */
2792
2793         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2794
2795         ff_er_frame_end(s);
2796
2797         MPV_frame_end(s);
2798
2799         if (s->pict_type == B_TYPE || s->low_delay) {
2800             *pict= *(AVFrame*)s->current_picture_ptr;
2801             ff_print_debug_info(s, pict);
2802         } else {
2803             s->picture_number++;
2804             /* latency of 1 frame for I and P frames */
2805             /* XXX: use another variable than picture_number */
2806             if (s->last_picture_ptr != NULL) {
2807                 *pict= *(AVFrame*)s->last_picture_ptr;
2808                  ff_print_debug_info(s, pict);
2809             }
2810         }
2811
2812         return 1;
2813     } else {
2814         return 0;
2815     }
2816 }
2817
2818 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2819                                  const uint8_t *buf, int buf_size)
2820 {
2821     Mpeg1Context *s1 = avctx->priv_data;
2822     MpegEncContext *s = &s1->mpeg_enc_ctx;
2823     int width,height;
2824     int i, v, j;
2825
2826     init_get_bits(&s->gb, buf, buf_size*8);
2827
2828     width = get_bits(&s->gb, 12);
2829     height = get_bits(&s->gb, 12);
2830     if (width <= 0 || height <= 0 ||
2831         (width % 2) != 0 || (height % 2) != 0)
2832         return -1;
2833     s->aspect_ratio_info= get_bits(&s->gb, 4);
2834     if (s->aspect_ratio_info == 0)
2835         return -1;
2836     s->frame_rate_index = get_bits(&s->gb, 4);
2837     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2838         return -1;
2839     s->bit_rate = get_bits(&s->gb, 18) * 400;
2840     if (get_bits1(&s->gb) == 0) /* marker */
2841         return -1;
2842     s->width = width;
2843     s->height = height;
2844
2845     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2846     skip_bits(&s->gb, 1);
2847
2848     /* get matrix */
2849     if (get_bits1(&s->gb)) {
2850         for(i=0;i<64;i++) {
2851             v = get_bits(&s->gb, 8);
2852             if(v==0){
2853                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2854                 return -1;
2855             }
2856             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2857             s->intra_matrix[j] = v;
2858             s->chroma_intra_matrix[j] = v;
2859         }
2860 #ifdef DEBUG
2861         dprintf(s->avctx, "intra matrix present\n");
2862         for(i=0;i<64;i++)
2863             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2864         dprintf(s->avctx, "\n");
2865 #endif
2866     } else {
2867         for(i=0;i<64;i++) {
2868             j = s->dsp.idct_permutation[i];
2869             v = ff_mpeg1_default_intra_matrix[i];
2870             s->intra_matrix[j] = v;
2871             s->chroma_intra_matrix[j] = v;
2872         }
2873     }
2874     if (get_bits1(&s->gb)) {
2875         for(i=0;i<64;i++) {
2876             v = get_bits(&s->gb, 8);
2877             if(v==0){
2878                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2879                 return -1;
2880             }
2881             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2882             s->inter_matrix[j] = v;
2883             s->chroma_inter_matrix[j] = v;
2884         }
2885 #ifdef DEBUG
2886         dprintf(s->avctx, "non intra matrix present\n");
2887         for(i=0;i<64;i++)
2888             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2889         dprintf(s->avctx, "\n");
2890 #endif
2891     } else {
2892         for(i=0;i<64;i++) {
2893             int j= s->dsp.idct_permutation[i];
2894             v = ff_mpeg1_default_non_intra_matrix[i];
2895             s->inter_matrix[j] = v;
2896             s->chroma_inter_matrix[j] = v;
2897         }
2898     }
2899
2900     if(show_bits(&s->gb, 23) != 0){
2901         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2902         return -1;
2903     }
2904
2905     /* we set mpeg2 parameters so that it emulates mpeg1 */
2906     s->progressive_sequence = 1;
2907     s->progressive_frame = 1;
2908     s->picture_structure = PICT_FRAME;
2909     s->frame_pred_frame_dct = 1;
2910     s->chroma_format = 1;
2911     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2912     avctx->sub_id = 1; /* indicates mpeg1 */
2913     s->out_format = FMT_MPEG1;
2914     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2915     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2916
2917     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2918         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2919                s->avctx->rc_buffer_size, s->bit_rate);
2920
2921     return 0;
2922 }
2923
2924 static int vcr2_init_sequence(AVCodecContext *avctx)
2925 {
2926     Mpeg1Context *s1 = avctx->priv_data;
2927     MpegEncContext *s = &s1->mpeg_enc_ctx;
2928     int i, v;
2929
2930     /* start new mpeg1 context decoding */
2931     s->out_format = FMT_MPEG1;
2932     if (s1->mpeg_enc_ctx_allocated) {
2933         MPV_common_end(s);
2934     }
2935     s->width  = avctx->coded_width;
2936     s->height = avctx->coded_height;
2937     avctx->has_b_frames= 0; //true?
2938     s->low_delay= 1;
2939
2940     if(avctx->xvmc_acceleration){
2941         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2942     }else{
2943         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2944     }
2945
2946     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2947         if( avctx->idct_algo == FF_IDCT_AUTO )
2948             avctx->idct_algo = FF_IDCT_SIMPLE;
2949
2950     if (MPV_common_init(s) < 0)
2951         return -1;
2952     exchange_uv(s);//common init reset pblocks, so we swap them here
2953     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2954     s1->mpeg_enc_ctx_allocated = 1;
2955
2956     for(i=0;i<64;i++) {
2957         int j= s->dsp.idct_permutation[i];
2958         v = ff_mpeg1_default_intra_matrix[i];
2959         s->intra_matrix[j] = v;
2960         s->chroma_intra_matrix[j] = v;
2961
2962         v = ff_mpeg1_default_non_intra_matrix[i];
2963         s->inter_matrix[j] = v;
2964         s->chroma_inter_matrix[j] = v;
2965     }
2966
2967     s->progressive_sequence = 1;
2968     s->progressive_frame = 1;
2969     s->picture_structure = PICT_FRAME;
2970     s->frame_pred_frame_dct = 1;
2971     s->chroma_format = 1;
2972     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2973     avctx->sub_id = 2; /* indicates mpeg2 */
2974     return 0;
2975 }
2976
2977
2978 static void mpeg_decode_user_data(AVCodecContext *avctx,
2979                                   const uint8_t *buf, int buf_size)
2980 {
2981     const uint8_t *p;
2982     int len, flags;
2983     p = buf;
2984     len = buf_size;
2985
2986     /* we parse the DTG active format information */
2987     if (len >= 5 &&
2988         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2989         flags = p[4];
2990         p += 5;
2991         len -= 5;
2992         if (flags & 0x80) {
2993             /* skip event id */
2994             if (len < 2)
2995                 return;
2996             p += 2;
2997             len -= 2;
2998         }
2999         if (flags & 0x40) {
3000             if (len < 1)
3001                 return;
3002             avctx->dtg_active_format = p[0] & 0x0f;
3003         }
3004     }
3005 }
3006
3007 static void mpeg_decode_gop(AVCodecContext *avctx,
3008                             const uint8_t *buf, int buf_size){
3009     Mpeg1Context *s1 = avctx->priv_data;
3010     MpegEncContext *s = &s1->mpeg_enc_ctx;
3011
3012     int drop_frame_flag;
3013     int time_code_hours, time_code_minutes;
3014     int time_code_seconds, time_code_pictures;
3015     int broken_link;
3016
3017     init_get_bits(&s->gb, buf, buf_size*8);
3018
3019     drop_frame_flag = get_bits1(&s->gb);
3020
3021     time_code_hours=get_bits(&s->gb,5);
3022     time_code_minutes = get_bits(&s->gb,6);
3023     skip_bits1(&s->gb);//marker bit
3024     time_code_seconds = get_bits(&s->gb,6);
3025     time_code_pictures = get_bits(&s->gb,6);
3026
3027     /*broken_link indicate that after editing the
3028       reference frames of the first B-Frames after GOP I-Frame
3029       are missing (open gop)*/
3030     broken_link = get_bits1(&s->gb);
3031
3032     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
3033         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
3034             time_code_hours, time_code_minutes, time_code_seconds,
3035             time_code_pictures, broken_link);
3036 }
3037 /**
3038  * finds the end of the current frame in the bitstream.
3039  * @return the position of the first byte of the next frame, or -1
3040  */
3041 static int mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
3042 {
3043     int i;
3044     uint32_t state= pc->state;
3045
3046     i=0;
3047     if(!pc->frame_start_found){
3048         for(i=0; i<buf_size; i++){
3049             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3050             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3051                 i++;
3052                 pc->frame_start_found=1;
3053                 break;
3054             }
3055         }
3056     }
3057
3058     if(pc->frame_start_found){
3059         /* EOF considered as end of frame */
3060         if (buf_size == 0)
3061             return 0;
3062         for(; i<buf_size; i++){
3063             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3064             if((state&0xFFFFFF00) == 0x100){
3065                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3066                     pc->frame_start_found=0;
3067                     pc->state=-1;
3068                     return i-3;
3069                 }
3070             }
3071         }
3072     }
3073     pc->state= state;
3074     return END_NOT_FOUND;
3075 }
3076
3077 /* handle buffering and image synchronisation */
3078 static int mpeg_decode_frame(AVCodecContext *avctx,
3079                              void *data, int *data_size,
3080                              uint8_t *buf, int buf_size)
3081 {
3082     Mpeg1Context *s = avctx->priv_data;
3083     const uint8_t *buf_end;
3084     const uint8_t *buf_ptr;
3085     uint32_t start_code;
3086     int ret, input_size;
3087     AVFrame *picture = data;
3088     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3089     dprintf(avctx, "fill_buffer\n");
3090
3091     if (buf_size == 0) {
3092         /* special case for last picture */
3093         if (s2->low_delay==0 && s2->next_picture_ptr) {
3094             *picture= *(AVFrame*)s2->next_picture_ptr;
3095             s2->next_picture_ptr= NULL;
3096
3097             *data_size = sizeof(AVFrame);
3098         }
3099         return 0;
3100     }
3101
3102     if(s2->flags&CODEC_FLAG_TRUNCATED){
3103         int next= mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3104
3105         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3106             return buf_size;
3107     }
3108
3109     buf_ptr = buf;
3110     buf_end = buf + buf_size;
3111
3112 #if 0
3113     if (s->repeat_field % 2 == 1) {
3114         s->repeat_field++;
3115         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3116         //        s2->picture_number, s->repeat_field);
3117         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3118             *data_size = sizeof(AVPicture);
3119             goto the_end;
3120         }
3121     }
3122 #endif
3123
3124     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3125         vcr2_init_sequence(avctx);
3126
3127     s->slice_count= 0;
3128
3129     for(;;) {
3130         /* find start next code */
3131         start_code = -1;
3132         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3133         if (start_code > 0x1ff){
3134             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3135                 if(avctx->thread_count > 1){
3136                     int i;
3137
3138                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3139                     for(i=0; i<s->slice_count; i++)
3140                         s2->error_count += s2->thread_context[i]->error_count;
3141                 }
3142                 if (slice_end(avctx, picture)) {
3143                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3144                         *data_size = sizeof(AVPicture);
3145                 }
3146             }
3147             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3148         }
3149
3150         input_size = buf_end - buf_ptr;
3151
3152         if(avctx->debug & FF_DEBUG_STARTCODE){
3153             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3154         }
3155
3156         /* prepare data for next start code */
3157         switch(start_code) {
3158         case SEQ_START_CODE:
3159             mpeg1_decode_sequence(avctx, buf_ptr,
3160                                     input_size);
3161             break;
3162
3163         case PICTURE_START_CODE:
3164             /* we have a complete image : we try to decompress it */
3165             mpeg1_decode_picture(avctx,
3166                                     buf_ptr, input_size);
3167             break;
3168         case EXT_START_CODE:
3169             mpeg_decode_extension(avctx,
3170                                     buf_ptr, input_size);
3171             break;
3172         case USER_START_CODE:
3173             mpeg_decode_user_data(avctx,
3174                                     buf_ptr, input_size);
3175             break;
3176         case GOP_START_CODE:
3177             s2->first_field=0;
3178             mpeg_decode_gop(avctx,
3179                                     buf_ptr, input_size);
3180             break;
3181         default:
3182             if (start_code >= SLICE_MIN_START_CODE &&
3183                 start_code <= SLICE_MAX_START_CODE) {
3184                 int mb_y= start_code - SLICE_MIN_START_CODE;
3185
3186                 if(s2->last_picture_ptr==NULL){
3187                 /* skip b frames if we dont have reference frames */
3188                     if(s2->pict_type==B_TYPE) break;
3189                 /* skip P frames if we dont have reference frame no valid header */
3190 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3191                 }
3192                 /* skip b frames if we are in a hurry */
3193                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3194                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3195                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3196                     || avctx->skip_frame >= AVDISCARD_ALL)
3197                     break;
3198                 /* skip everything if we are in a hurry>=5 */
3199                 if(avctx->hurry_up>=5) break;
3200
3201                 if (!s->mpeg_enc_ctx_allocated) break;
3202
3203                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3204                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3205                         break;
3206                 }
3207
3208                 if(s2->first_slice){
3209                     s2->first_slice=0;
3210                             if(mpeg_field_start(s2) < 0)
3211                         return -1;
3212                     }
3213                 if(!s2->current_picture_ptr){
3214                     av_log(avctx, AV_LOG_ERROR, "current_picture not initalized\n");
3215                     return -1;
3216                 }
3217
3218                 if(avctx->thread_count > 1){
3219                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3220                     if(threshold <= mb_y){
3221                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3222
3223                         thread_context->start_mb_y= mb_y;
3224                         thread_context->end_mb_y  = s2->mb_height;
3225                         if(s->slice_count){
3226                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3227                             ff_update_duplicate_context(thread_context, s2);
3228                         }
3229                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3230                         s->slice_count++;
3231                     }
3232                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
3233                 }else{
3234                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3235                     emms_c();
3236
3237                     if(ret < 0){
3238                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3239                             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);
3240                     }else{
3241                         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);
3242                     }
3243                 }
3244             }
3245             break;
3246         }
3247     }
3248 }
3249
3250 static int mpeg_decode_end(AVCodecContext *avctx)
3251 {
3252     Mpeg1Context *s = avctx->priv_data;
3253
3254     if (s->mpeg_enc_ctx_allocated)
3255         MPV_common_end(&s->mpeg_enc_ctx);
3256     return 0;
3257 }
3258
3259 AVCodec mpeg1video_decoder = {
3260     "mpeg1video",
3261     CODEC_TYPE_VIDEO,
3262     CODEC_ID_MPEG1VIDEO,
3263     sizeof(Mpeg1Context),
3264     mpeg_decode_init,
3265     NULL,
3266     mpeg_decode_end,
3267     mpeg_decode_frame,
3268     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3269     .flush= ff_mpeg_flush,
3270 };
3271
3272 AVCodec mpeg2video_decoder = {
3273     "mpeg2video",
3274     CODEC_TYPE_VIDEO,
3275     CODEC_ID_MPEG2VIDEO,
3276     sizeof(Mpeg1Context),
3277     mpeg_decode_init,
3278     NULL,
3279     mpeg_decode_end,
3280     mpeg_decode_frame,
3281     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3282     .flush= ff_mpeg_flush,
3283 };
3284
3285 //legacy decoder
3286 AVCodec mpegvideo_decoder = {
3287     "mpegvideo",
3288     CODEC_TYPE_VIDEO,
3289     CODEC_ID_MPEG2VIDEO,
3290     sizeof(Mpeg1Context),
3291     mpeg_decode_init,
3292     NULL,
3293     mpeg_decode_end,
3294     mpeg_decode_frame,
3295     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3296     .flush= ff_mpeg_flush,
3297 };
3298
3299 #ifdef CONFIG_ENCODERS
3300
3301 AVCodec mpeg1video_encoder = {
3302     "mpeg1video",
3303     CODEC_TYPE_VIDEO,
3304     CODEC_ID_MPEG1VIDEO,
3305     sizeof(MpegEncContext),
3306     encode_init,
3307     MPV_encode_picture,
3308     MPV_encode_end,
3309     .supported_framerates= ff_frame_rate_tab+1,
3310     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3311     .capabilities= CODEC_CAP_DELAY,
3312 };
3313
3314 AVCodec mpeg2video_encoder = {
3315     "mpeg2video",
3316     CODEC_TYPE_VIDEO,
3317     CODEC_ID_MPEG2VIDEO,
3318     sizeof(MpegEncContext),
3319     encode_init,
3320     MPV_encode_picture,
3321     MPV_encode_end,
3322     .supported_framerates= ff_frame_rate_tab+1,
3323     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3324     .capabilities= CODEC_CAP_DELAY,
3325 };
3326 #endif
3327
3328 #ifdef HAVE_XVMC
3329 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3330     Mpeg1Context *s;
3331
3332     if( avctx->thread_count > 1)
3333         return -1;
3334     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3335         return -1;
3336     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3337         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3338     }
3339     mpeg_decode_init(avctx);
3340     s = avctx->priv_data;
3341
3342     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3343     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3344
3345     return 0;
3346 }
3347
3348 AVCodec mpeg_xvmc_decoder = {
3349     "mpegvideo_xvmc",
3350     CODEC_TYPE_VIDEO,
3351     CODEC_ID_MPEG2VIDEO_XVMC,
3352     sizeof(Mpeg1Context),
3353     mpeg_mc_decode_init,
3354     NULL,
3355     mpeg_decode_end,
3356     mpeg_decode_frame,
3357     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3358     .flush= ff_mpeg_flush,
3359 };
3360
3361 #endif
3362
3363 #ifdef CONFIG_MPEGVIDEO_PARSER
3364 static void mpegvideo_extract_headers(AVCodecParserContext *s,
3365                                       AVCodecContext *avctx,
3366                                       const uint8_t *buf, int buf_size)
3367 {
3368     ParseContext1 *pc = s->priv_data;
3369     const uint8_t *buf_end;
3370     uint32_t start_code;
3371     int frame_rate_index, ext_type, bytes_left;
3372     int frame_rate_ext_n, frame_rate_ext_d;
3373     int picture_structure, top_field_first, repeat_first_field, progressive_frame;
3374     int horiz_size_ext, vert_size_ext, bit_rate_ext;
3375 //FIXME replace the crap with get_bits()
3376     s->repeat_pict = 0;
3377     buf_end = buf + buf_size;
3378     while (buf < buf_end) {
3379         start_code= -1;
3380         buf= ff_find_start_code(buf, buf_end, &start_code);
3381         bytes_left = buf_end - buf;
3382         switch(start_code) {
3383         case PICTURE_START_CODE:
3384             if (bytes_left >= 2) {
3385                 s->pict_type = (buf[1] >> 3) & 7;
3386             }
3387             break;
3388         case SEQ_START_CODE:
3389             if (bytes_left >= 7) {
3390                 pc->width  = (buf[0] << 4) | (buf[1] >> 4);
3391                 pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
3392                 avcodec_set_dimensions(avctx, pc->width, pc->height);
3393                 frame_rate_index = buf[3] & 0xf;
3394                 pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
3395                 pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
3396                 avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
3397                 avctx->codec_id = CODEC_ID_MPEG1VIDEO;
3398                 avctx->sub_id = 1;
3399             }
3400             break;
3401         case EXT_START_CODE:
3402             if (bytes_left >= 1) {
3403                 ext_type = (buf[0] >> 4);
3404                 switch(ext_type) {
3405                 case 0x1: /* sequence extension */
3406                     if (bytes_left >= 6) {
3407                         horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
3408                         vert_size_ext = (buf[2] >> 5) & 3;
3409                         bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
3410                         frame_rate_ext_n = (buf[5] >> 5) & 3;
3411                         frame_rate_ext_d = (buf[5] & 0x1f);
3412                         pc->progressive_sequence = buf[1] & (1 << 3);
3413                         avctx->has_b_frames= !(buf[5] >> 7);
3414
3415                         pc->width  |=(horiz_size_ext << 12);
3416                         pc->height |=( vert_size_ext << 12);
3417                         avctx->bit_rate += (bit_rate_ext << 18) * 400;
3418                         avcodec_set_dimensions(avctx, pc->width, pc->height);
3419                         avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
3420                         avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
3421                         avctx->codec_id = CODEC_ID_MPEG2VIDEO;
3422                         avctx->sub_id = 2; /* forces MPEG2 */
3423                     }
3424                     break;
3425                 case 0x8: /* picture coding extension */
3426                     if (bytes_left >= 5) {
3427                         picture_structure = buf[2]&3;
3428                         top_field_first = buf[3] & (1 << 7);
3429                         repeat_first_field = buf[3] & (1 << 1);
3430                         progressive_frame = buf[4] & (1 << 7);
3431
3432                         /* check if we must repeat the frame */
3433                         if (repeat_first_field) {
3434                             if (pc->progressive_sequence) {
3435                                 if (top_field_first)
3436                                     s->repeat_pict = 4;
3437                                 else
3438                                     s->repeat_pict = 2;
3439                             } else if (progressive_frame) {
3440                                 s->repeat_pict = 1;
3441                             }
3442                         }
3443
3444                         /* the packet only represents half a frame
3445                            XXX,FIXME maybe find a different solution */
3446                         if(picture_structure != 3)
3447                             s->repeat_pict = -1;
3448                     }
3449                     break;
3450                 }
3451             }
3452             break;
3453         case -1:
3454             goto the_end;
3455         default:
3456             /* we stop parsing when we encounter a slice. It ensures
3457                that this function takes a negligible amount of time */
3458             if (start_code >= SLICE_MIN_START_CODE &&
3459                 start_code <= SLICE_MAX_START_CODE)
3460                 goto the_end;
3461             break;
3462         }
3463     }
3464  the_end: ;
3465 }
3466
3467 static int mpegvideo_parse(AVCodecParserContext *s,
3468                            AVCodecContext *avctx,
3469                            uint8_t **poutbuf, int *poutbuf_size