1000l to myself - get correct quantization for blocks 1 and 2
[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_FCODE+1][MAX_MV*2+1];
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 uint8_t static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
112
113 static void init_2d_vlc_rl(RLTable *rl, int use_static)
114 {
115     int i;
116
117     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
118              &rl->table_vlc[0][1], 4, 2,
119              &rl->table_vlc[0][0], 4, 2, use_static);
120
121     if(use_static)
122         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
123     else
124         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
125
126     for(i=0; i<rl->vlc.table_size; i++){
127         int code= rl->vlc.table[i][0];
128         int len = rl->vlc.table[i][1];
129         int level, run;
130
131         if(len==0){ // illegal code
132             run= 65;
133             level= MAX_LEVEL;
134         }else if(len<0){ //more bits needed
135             run= 0;
136             level= code;
137         }else{
138             if(code==rl->n){ //esc
139                 run= 65;
140                 level= 0;
141             }else if(code==rl->n+1){ //eob
142                 run= 0;
143                 level= 127;
144             }else{
145                 run=   rl->table_run  [code] + 1;
146                 level= rl->table_level[code];
147             }
148         }
149         rl->rl_vlc[0][i].len= len;
150         rl->rl_vlc[0][i].level= level;
151         rl->rl_vlc[0][i].run= run;
152     }
153 }
154
155 #ifdef CONFIG_ENCODERS
156 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
157     int i;
158
159     for(i=0; i<128; i++){
160         int level= i-64;
161         int run;
162         for(run=0; run<64; run++){
163             int len, bits, code;
164
165             int alevel= FFABS(level);
166             int sign= (level>>31)&1;
167
168             if (alevel > rl->max_level[0][run])
169                 code= 111; /*rl->n*/
170             else
171                 code= rl->index_run[0][run] + alevel - 1;
172
173             if (code < 111 /* rl->n */) {
174                 /* store the vlc & sign at once */
175                 len=   rl->table_vlc[code][1]+1;
176                 bits= (rl->table_vlc[code][0]<<1) + sign;
177             } else {
178                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
179                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
180
181                 bits|= run;
182                 if (alevel < 128) {
183                     bits<<=8; len+=8;
184                     bits|= level & 0xff;
185                 } else {
186                     bits<<=16; len+=16;
187                     bits|= level & 0xff;
188                     if (level < 0) {
189                         bits|= 0x8001 + level + 255;
190                     } else {
191                         bits|= level & 0xffff;
192                     }
193                 }
194             }
195
196             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
197         }
198     }
199 }
200
201
202 static int find_frame_rate_index(MpegEncContext *s){
203     int i;
204     int64_t dmin= INT64_MAX;
205     int64_t d;
206
207     for(i=1;i<14;i++) {
208         int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
209         int64_t n1= 1001LL*s->avctx->time_base.den;
210         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
211
212         d = FFABS(n0 - n1);
213         if(d < dmin){
214             dmin=d;
215             s->frame_rate_index= i;
216         }
217     }
218     if(dmin)
219         return -1;
220     else
221         return 0;
222 }
223
224 static int encode_init(AVCodecContext *avctx)
225 {
226     MpegEncContext *s = avctx->priv_data;
227
228     if(MPV_encode_init(avctx) < 0)
229         return -1;
230
231     if(find_frame_rate_index(s) < 0){
232         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
233             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
234             return -1;
235         }else{
236             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);
237         }
238     }
239
240     if(avctx->profile == FF_PROFILE_UNKNOWN){
241         if(avctx->level != FF_LEVEL_UNKNOWN){
242             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
243             return -1;
244         }
245         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
246     }
247
248     if(avctx->level == FF_LEVEL_UNKNOWN){
249         if(avctx->profile == 0){ /* 4:2:2 */
250             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
251             else                                            avctx->level = 2; /* High */
252         }else{
253             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
254                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
255                 return -1;
256             }
257             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
258             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
259             else                                            avctx->level = 4; /* High */
260         }
261     }
262
263     if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
264         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
265         return -1;
266     }
267
268     return 0;
269 }
270
271 static void put_header(MpegEncContext *s, int header)
272 {
273     align_put_bits(&s->pb);
274     put_bits(&s->pb, 16, header>>16);
275     put_bits(&s->pb, 16, header&0xFFFF);
276 }
277
278 /* put sequence header if needed */
279 static void mpeg1_encode_sequence_header(MpegEncContext *s)
280 {
281         unsigned int vbv_buffer_size;
282         unsigned int fps, v;
283         int i;
284         uint64_t time_code;
285         float best_aspect_error= 1E10;
286         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
287         int constraint_parameter_flag;
288
289         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
290
291         if (s->current_picture.key_frame) {
292             AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
293
294             /* mpeg1 header repeated every gop */
295             put_header(s, SEQ_START_CODE);
296
297             put_bits(&s->pb, 12, s->width);
298             put_bits(&s->pb, 12, s->height);
299
300             for(i=1; i<15; i++){
301                 float error= aspect_ratio;
302                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
303                     error-= 1.0/mpeg1_aspect[i];
304                 else
305                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
306
307                 error= FFABS(error);
308
309                 if(error < best_aspect_error){
310                     best_aspect_error= error;
311                     s->aspect_ratio_info= i;
312                 }
313             }
314
315             put_bits(&s->pb, 4, s->aspect_ratio_info);
316             put_bits(&s->pb, 4, s->frame_rate_index);
317
318             if(s->avctx->rc_max_rate){
319                 v = (s->avctx->rc_max_rate + 399) / 400;
320                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
321                     v = 0x3ffff;
322             }else{
323                 v= 0x3FFFF;
324             }
325
326             if(s->avctx->rc_buffer_size)
327                 vbv_buffer_size = s->avctx->rc_buffer_size;
328             else
329                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
330                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
331             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
332
333             put_bits(&s->pb, 18, v & 0x3FFFF);
334             put_bits(&s->pb, 1, 1); /* marker */
335             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
336
337             constraint_parameter_flag=
338                 s->width <= 768 && s->height <= 576 &&
339                 s->mb_width * s->mb_height <= 396 &&
340                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
341                 framerate.num <= framerate.den*30 &&
342                 s->avctx->me_range && s->avctx->me_range < 128 &&
343                 vbv_buffer_size <= 20 &&
344                 v <= 1856000/400 &&
345                 s->codec_id == CODEC_ID_MPEG1VIDEO;
346
347             put_bits(&s->pb, 1, constraint_parameter_flag);
348
349             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
350             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
351
352             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
353                 put_header(s, EXT_START_CODE);
354                 put_bits(&s->pb, 4, 1); //seq ext
355
356                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
357
358                 put_bits(&s->pb, 3, s->avctx->profile); //profile
359                 put_bits(&s->pb, 4, s->avctx->level); //level
360
361                 put_bits(&s->pb, 1, s->progressive_sequence);
362                 put_bits(&s->pb, 2, s->chroma_format);
363                 put_bits(&s->pb, 2, 0); //horizontal size ext
364                 put_bits(&s->pb, 2, 0); //vertical size ext
365                 put_bits(&s->pb, 12, v>>18); //bitrate ext
366                 put_bits(&s->pb, 1, 1); //marker
367                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
368                 put_bits(&s->pb, 1, s->low_delay);
369                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
370                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
371             }
372
373             put_header(s, GOP_START_CODE);
374             put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
375             /* time code : we must convert from the real frame rate to a
376                fake mpeg frame rate in case of low frame rate */
377             fps = (framerate.num + framerate.den/2)/ framerate.den;
378             time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
379
380             s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
381             if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
382                 /* only works for NTSC 29.97 */
383                 int d = time_code / 17982;
384                 int m = time_code % 17982;
385                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
386                 time_code += 18 * d + 2 * ((m - 2) / 1798);
387             }
388             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
389             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
390             put_bits(&s->pb, 1, 1);
391             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
392             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
393             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
394             put_bits(&s->pb, 1, 0); /* broken link */
395         }
396 }
397
398 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
399     while (run >= 33) {
400         put_bits(&s->pb, 11, 0x008);
401         run -= 33;
402     }
403     put_bits(&s->pb, mbAddrIncrTable[run][1],
404              mbAddrIncrTable[run][0]);
405 }
406 #endif //CONFIG_ENCODERS
407
408 static void common_init(MpegEncContext *s)
409 {
410
411     s->y_dc_scale_table=
412     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
413
414 }
415
416 void ff_mpeg1_clean_buffers(MpegEncContext *s){
417     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
418     s->last_dc[1] = s->last_dc[0];
419     s->last_dc[2] = s->last_dc[0];
420     memset(s->last_mv, 0, sizeof(s->last_mv));
421 }
422
423 #ifdef CONFIG_ENCODERS
424
425 static av_always_inline void put_qscale(MpegEncContext *s)
426 {
427     if(s->q_scale_type){
428         assert(s->qscale>=1 && s->qscale <=12);
429         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
430     }else{
431         put_bits(&s->pb, 5, s->qscale);
432     }
433 }
434
435 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
436     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
437     put_qscale(s);
438     put_bits(&s->pb, 1, 0); /* slice extra information */
439 }
440
441 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
442 {
443     mpeg1_encode_sequence_header(s);
444
445     /* mpeg1 picture header */
446     put_header(s, PICTURE_START_CODE);
447     /* temporal reference */
448
449     // RAL: s->picture_number instead of s->fake_picture_number
450     put_bits(&s->pb, 10, (s->picture_number -
451                           s->gop_picture_number) & 0x3ff);
452     put_bits(&s->pb, 3, s->pict_type);
453
454     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
455     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
456
457     // RAL: Forward f_code also needed for B frames
458     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
459         put_bits(&s->pb, 1, 0); /* half pel coordinates */
460         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
461             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
462         else
463             put_bits(&s->pb, 3, 7); /* forward_f_code */
464     }
465
466     // RAL: Backward f_code necessary for B frames
467     if (s->pict_type == B_TYPE) {
468         put_bits(&s->pb, 1, 0); /* half pel coordinates */
469         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
470             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
471         else
472             put_bits(&s->pb, 3, 7); /* backward_f_code */
473     }
474
475     put_bits(&s->pb, 1, 0); /* extra bit picture */
476
477     s->frame_pred_frame_dct = 1;
478     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
479         put_header(s, EXT_START_CODE);
480         put_bits(&s->pb, 4, 8); //pic ext
481         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
482             put_bits(&s->pb, 4, s->f_code);
483             put_bits(&s->pb, 4, s->f_code);
484         }else{
485             put_bits(&s->pb, 8, 255);
486         }
487         if (s->pict_type == B_TYPE) {
488             put_bits(&s->pb, 4, s->b_code);
489             put_bits(&s->pb, 4, s->b_code);
490         }else{
491             put_bits(&s->pb, 8, 255);
492         }
493         put_bits(&s->pb, 2, s->intra_dc_precision);
494
495         assert(s->picture_structure == PICT_FRAME);
496         put_bits(&s->pb, 2, s->picture_structure);
497         if (s->progressive_sequence) {
498             put_bits(&s->pb, 1, 0); /* no repeat */
499         } else {
500             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
501         }
502         /* XXX: optimize the generation of this flag with entropy
503            measures */
504         s->frame_pred_frame_dct = s->progressive_sequence;
505
506         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
507         put_bits(&s->pb, 1, s->concealment_motion_vectors);
508         put_bits(&s->pb, 1, s->q_scale_type);
509         put_bits(&s->pb, 1, s->intra_vlc_format);
510         put_bits(&s->pb, 1, s->alternate_scan);
511         put_bits(&s->pb, 1, s->repeat_first_field);
512         s->progressive_frame = s->progressive_sequence;
513         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
514         put_bits(&s->pb, 1, s->progressive_frame);
515         put_bits(&s->pb, 1, 0); //composite_display_flag
516     }
517     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
518         int i;
519
520         put_header(s, USER_START_CODE);
521         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
522             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
523         }
524     }
525
526     s->mb_y=0;
527     ff_mpeg1_encode_slice_header(s);
528 }
529
530 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
531                                 int has_mv, int field_motion)
532 {
533     put_bits(&s->pb, n, bits);
534     if (!s->frame_pred_frame_dct) {
535         if (has_mv)
536             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
537         put_bits(&s->pb, 1, s->interlaced_dct);
538     }
539 }
540
541 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
542                                                    DCTELEM block[6][64],
543                                                    int motion_x, int motion_y,
544                                                    int mb_block_count)
545 {
546     int i, cbp;
547     const int mb_x = s->mb_x;
548     const int mb_y = s->mb_y;
549     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
550
551     /* compute cbp */
552     cbp = 0;
553     for(i=0;i<mb_block_count;i++) {
554         if (s->block_last_index[i] >= 0)
555             cbp |= 1 << (mb_block_count - 1 - i);
556     }
557
558     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
559         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
560         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
561         (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) |
562         ((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))) {
563         s->mb_skip_run++;
564         s->qscale -= s->dquant;
565         s->skip_count++;
566         s->misc_bits++;
567         s->last_bits++;
568         if(s->pict_type == P_TYPE){
569             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
570             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
571         }
572     } else {
573         if(first_mb){
574             assert(s->mb_skip_run == 0);
575             encode_mb_skip_run(s, s->mb_x);
576         }else{
577             encode_mb_skip_run(s, s->mb_skip_run);
578         }
579
580         if (s->pict_type == I_TYPE) {
581             if(s->dquant && cbp){
582                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
583                 put_qscale(s);
584             }else{
585                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
586                 s->qscale -= s->dquant;
587             }
588             s->misc_bits+= get_bits_diff(s);
589             s->i_count++;
590         } else if (s->mb_intra) {
591             if(s->dquant && cbp){
592                 put_mb_modes(s, 6, 0x01, 0, 0);
593                 put_qscale(s);
594             }else{
595                 put_mb_modes(s, 5, 0x03, 0, 0);
596                 s->qscale -= s->dquant;
597             }
598             s->misc_bits+= get_bits_diff(s);
599             s->i_count++;
600             memset(s->last_mv, 0, sizeof(s->last_mv));
601         } else if (s->pict_type == P_TYPE) {
602             if(s->mv_type == MV_TYPE_16X16){
603                 if (cbp != 0) {
604                     if ((motion_x|motion_y) == 0) {
605                         if(s->dquant){
606                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
607                             put_qscale(s);
608                         }else{
609                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
610                         }
611                         s->misc_bits+= get_bits_diff(s);
612                     } else {
613                         if(s->dquant){
614                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
615                             put_qscale(s);
616                         }else{
617                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
618                         }
619                         s->misc_bits+= get_bits_diff(s);
620                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
621                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
622                         s->mv_bits+= get_bits_diff(s);
623                     }
624                 } else {
625                     put_bits(&s->pb, 3, 1); /* motion only */
626                     if (!s->frame_pred_frame_dct)
627                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
628                     s->misc_bits+= get_bits_diff(s);
629                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
630                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
631                     s->qscale -= s->dquant;
632                     s->mv_bits+= get_bits_diff(s);
633                 }
634                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
635                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
636             }else{
637                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
638
639                 if (cbp) {
640                     if(s->dquant){
641                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
642                         put_qscale(s);
643                     }else{
644                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
645                     }
646                 } else {
647                     put_bits(&s->pb, 3, 1); /* motion only */
648                     put_bits(&s->pb, 2, 1); /* motion_type: field */
649                     s->qscale -= s->dquant;
650                 }
651                 s->misc_bits+= get_bits_diff(s);
652                 for(i=0; i<2; i++){
653                     put_bits(&s->pb, 1, s->field_select[0][i]);
654                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
655                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
656                     s->last_mv[0][i][0]=   s->mv[0][i][0];
657                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
658                 }
659                 s->mv_bits+= get_bits_diff(s);
660             }
661             if(cbp) {
662                 if (s->chroma_y_shift) {
663                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
664                 } else {
665                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
666                     put_bits(&s->pb, 2, cbp & 3);
667                 }
668             }
669             s->f_count++;
670         } else{
671             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
672
673             if(s->mv_type == MV_TYPE_16X16){
674                 if (cbp){    // With coded bloc pattern
675                     if (s->dquant) {
676                         if(s->mv_dir == MV_DIR_FORWARD)
677                             put_mb_modes(s, 6, 3, 1, 0);
678                         else
679                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
680                         put_qscale(s);
681                     } else {
682                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
683                     }
684                 }else{    // No coded bloc pattern
685                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
686                     if (!s->frame_pred_frame_dct)
687                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
688                     s->qscale -= s->dquant;
689                 }
690                 s->misc_bits += get_bits_diff(s);
691                 if (s->mv_dir&MV_DIR_FORWARD){
692                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
693                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
694                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
695                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
696                     s->f_count++;
697                 }
698                 if (s->mv_dir&MV_DIR_BACKWARD){
699                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
700                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
701                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
702                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
703                     s->b_count++;
704                 }
705             }else{
706                 assert(s->mv_type == MV_TYPE_FIELD);
707                 assert(!s->frame_pred_frame_dct);
708                 if (cbp){    // With coded bloc pattern
709                     if (s->dquant) {
710                         if(s->mv_dir == MV_DIR_FORWARD)
711                             put_mb_modes(s, 6, 3, 1, 1);
712                         else
713                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
714                         put_qscale(s);
715                     } else {
716                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
717                     }
718                 }else{    // No coded bloc pattern
719                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
720                     put_bits(&s->pb, 2, 1); /* motion_type: field */
721                     s->qscale -= s->dquant;
722                 }
723                 s->misc_bits += get_bits_diff(s);
724                 if (s->mv_dir&MV_DIR_FORWARD){
725                     for(i=0; i<2; i++){
726                         put_bits(&s->pb, 1, s->field_select[0][i]);
727                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
728                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
729                         s->last_mv[0][i][0]=   s->mv[0][i][0];
730                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
731                     }
732                     s->f_count++;
733                 }
734                 if (s->mv_dir&MV_DIR_BACKWARD){
735                     for(i=0; i<2; i++){
736                         put_bits(&s->pb, 1, s->field_select[1][i]);
737                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
738                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
739                         s->last_mv[1][i][0]=   s->mv[1][i][0];
740                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
741                     }
742                     s->b_count++;
743                 }
744             }
745             s->mv_bits += get_bits_diff(s);
746             if(cbp) {
747                 if (s->chroma_y_shift) {
748                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
749                 } else {
750                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
751                     put_bits(&s->pb, 2, cbp & 3);
752                 }
753             }
754         }
755         for(i=0;i<mb_block_count;i++) {
756             if (cbp & (1 << (mb_block_count - 1 - i))) {
757                 mpeg1_encode_block(s, block[i], i);
758             }
759         }
760         s->mb_skip_run = 0;
761         if(s->mb_intra)
762             s->i_tex_bits+= get_bits_diff(s);
763         else
764             s->p_tex_bits+= get_bits_diff(s);
765     }
766 }
767
768 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
769 {
770     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
771     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
772 }
773
774 // RAL: Parameter added: f_or_b_code
775 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
776 {
777     int code, bit_size, l, bits, range, sign;
778
779     if (val == 0) {
780         /* zero vector */
781         code = 0;
782         put_bits(&s->pb,
783                  mbMotionVectorTable[0][1],
784                  mbMotionVectorTable[0][0]);
785     } else {
786         bit_size = f_or_b_code - 1;
787         range = 1 << bit_size;
788         /* modulo encoding */
789         l= INT_BIT - 5 - bit_size;
790         val= (val<<l)>>l;
791
792         if (val >= 0) {
793             val--;
794             code = (val >> bit_size) + 1;
795             bits = val & (range - 1);
796             sign = 0;
797         } else {
798             val = -val;
799             val--;
800             code = (val >> bit_size) + 1;
801             bits = val & (range - 1);
802             sign = 1;
803         }
804
805         assert(code > 0 && code <= 16);
806
807         put_bits(&s->pb,
808                  mbMotionVectorTable[code][1],
809                  mbMotionVectorTable[code][0]);
810
811         put_bits(&s->pb, 1, sign);
812         if (bit_size > 0) {
813             put_bits(&s->pb, bit_size, bits);
814         }
815     }
816 }
817
818 void ff_mpeg1_encode_init(MpegEncContext *s)
819 {
820     static int done=0;
821
822     common_init(s);
823
824     if(!done){
825         int f_code;
826         int mv;
827         int i;
828
829         done=1;
830         init_rl(&rl_mpeg1, static_rl_table_store[0]);
831         init_rl(&rl_mpeg2, static_rl_table_store[1]);
832
833         for(i=0; i<64; i++)
834         {
835                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
836                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
837         }
838
839         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
840         if(s->intra_vlc_format)
841             init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
842
843         /* build unified dc encoding tables */
844         for(i=-255; i<256; i++)
845         {
846                 int adiff, index;
847                 int bits, code;
848                 int diff=i;
849
850                 adiff = FFABS(diff);
851                 if(diff<0) diff--;
852                 index = av_log2(2*adiff);
853
854                 bits= vlc_dc_lum_bits[index] + index;
855                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
856                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
857
858                 bits= vlc_dc_chroma_bits[index] + index;
859                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
860                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
861         }
862
863         for(f_code=1; f_code<=MAX_FCODE; f_code++){
864             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
865                 int len;
866
867                 if(mv==0) len= mbMotionVectorTable[0][1];
868                 else{
869                     int val, bit_size, range, code;
870
871                     bit_size = f_code - 1;
872                     range = 1 << bit_size;
873
874                     val=mv;
875                     if (val < 0)
876                         val = -val;
877                     val--;
878                     code = (val >> bit_size) + 1;
879                     if(code<17){
880                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
881                     }else{
882                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
883                     }
884                 }
885
886                 mv_penalty[f_code][mv+MAX_MV]= len;
887             }
888         }
889
890
891         for(f_code=MAX_FCODE; f_code>0; f_code--){
892             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
893                 fcode_tab[mv+MAX_MV]= f_code;
894             }
895         }
896     }
897     s->me.mv_penalty= mv_penalty;
898     s->fcode_tab= fcode_tab;
899     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
900         s->min_qcoeff=-255;
901         s->max_qcoeff= 255;
902     }else{
903         s->min_qcoeff=-2047;
904         s->max_qcoeff= 2047;
905     }
906     if (s->intra_vlc_format) {
907         s->intra_ac_vlc_length=
908         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
909     } else {
910         s->intra_ac_vlc_length=
911         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
912     }
913     s->inter_ac_vlc_length=
914     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
915 }
916
917 static inline void encode_dc(MpegEncContext *s, int diff, int component)
918 {
919   if(((unsigned) (diff+255)) >= 511){
920         int index;
921
922         if(diff<0){
923             index= av_log2_16bit(-2*diff);
924             diff--;
925         }else{
926             index= av_log2_16bit(2*diff);
927         }
928         if (component == 0) {
929             put_bits(
930                 &s->pb,
931                 vlc_dc_lum_bits[index] + index,
932                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
933         }else{
934             put_bits(
935                 &s->pb,
936                 vlc_dc_chroma_bits[index] + index,
937                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
938         }
939   }else{
940     if (component == 0) {
941         put_bits(
942             &s->pb,
943             mpeg1_lum_dc_uni[diff+255]&0xFF,
944             mpeg1_lum_dc_uni[diff+255]>>8);
945     } else {
946         put_bits(
947             &s->pb,
948             mpeg1_chr_dc_uni[diff+255]&0xFF,
949             mpeg1_chr_dc_uni[diff+255]>>8);
950     }
951   }
952 }
953
954 static void mpeg1_encode_block(MpegEncContext *s,
955                                DCTELEM *block,
956                                int n)
957 {
958     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
959     int code, component;
960     const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
961
962     last_index = s->block_last_index[n];
963
964     /* DC coef */
965     if (s->mb_intra) {
966         component = (n <= 3 ? 0 : (n&1) + 1);
967         dc = block[0]; /* overflow is impossible */
968         diff = dc - s->last_dc[component];
969         encode_dc(s, diff, component);
970         s->last_dc[component] = dc;
971         i = 1;
972         if (s->intra_vlc_format)
973             table_vlc = rl_mpeg2.table_vlc;
974     } else {
975         /* encode the first coefficient : needs to be done here because
976            it is handled slightly differently */
977         level = block[0];
978         if (abs(level) == 1) {
979                 code = ((uint32_t)level >> 31); /* the sign bit */
980                 put_bits(&s->pb, 2, code | 0x02);
981                 i = 1;
982         } else {
983             i = 0;
984             last_non_zero = -1;
985             goto next_coef;
986         }
987     }
988
989     /* now quantify & encode AC coefs */
990     last_non_zero = i - 1;
991
992     for(;i<=last_index;i++) {
993         j = s->intra_scantable.permutated[i];
994         level = block[j];
995     next_coef:
996 #if 0
997         if (level != 0)
998             dprintf(s->avctx, "level[%d]=%d\n", i, level);
999 #endif
1000         /* encode using VLC */
1001         if (level != 0) {
1002             run = i - last_non_zero - 1;
1003
1004             alevel= level;
1005             MASK_ABS(sign, alevel)
1006             sign&=1;
1007
1008             if (alevel <= mpeg1_max_level[0][run]){
1009                 code= mpeg1_index_run[0][run] + alevel - 1;
1010                 /* store the vlc & sign at once */
1011                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
1012             } else {
1013                 /* escape seems to be pretty rare <5% so i dont optimize it */
1014                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
1015                 /* escape: only clip in this case */
1016                 put_bits(&s->pb, 6, run);
1017                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
1018                     if (alevel < 128) {
1019                         put_bits(&s->pb, 8, level & 0xff);
1020                     } else {
1021                         if (level < 0) {
1022                             put_bits(&s->pb, 16, 0x8001 + level + 255);
1023                         } else {
1024                             put_bits(&s->pb, 16, level & 0xffff);
1025                         }
1026                     }
1027                 }else{
1028                     put_bits(&s->pb, 12, level & 0xfff);
1029                 }
1030             }
1031             last_non_zero = i;
1032         }
1033     }
1034     /* end of block */
1035     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
1036 }
1037 #endif //CONFIG_ENCODERS
1038
1039 /******************************************/
1040 /* decoding */
1041
1042 static VLC dc_lum_vlc;
1043 static VLC dc_chroma_vlc;
1044 static VLC mv_vlc;
1045 static VLC mbincr_vlc;
1046 static VLC mb_ptype_vlc;
1047 static VLC mb_btype_vlc;
1048 static VLC mb_pat_vlc;
1049
1050 static void init_vlcs(void)
1051 {
1052     static int done = 0;
1053
1054     if (!done) {
1055         done = 1;
1056
1057         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1058                  vlc_dc_lum_bits, 1, 1,
1059                  vlc_dc_lum_code, 2, 2, 1);
1060         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1061                  vlc_dc_chroma_bits, 1, 1,
1062                  vlc_dc_chroma_code, 2, 2, 1);
1063         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1064                  &mbMotionVectorTable[0][1], 2, 1,
1065                  &mbMotionVectorTable[0][0], 2, 1, 1);
1066         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1067                  &mbAddrIncrTable[0][1], 2, 1,
1068                  &mbAddrIncrTable[0][0], 2, 1, 1);
1069         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1070                  &mbPatTable[0][1], 2, 1,
1071                  &mbPatTable[0][0], 2, 1, 1);
1072
1073         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1074                  &table_mb_ptype[0][1], 2, 1,
1075                  &table_mb_ptype[0][0], 2, 1, 1);
1076         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1077                  &table_mb_btype[0][1], 2, 1,
1078                  &table_mb_btype[0][0], 2, 1, 1);
1079         init_rl(&rl_mpeg1, static_rl_table_store[0]);
1080         init_rl(&rl_mpeg2, static_rl_table_store[1]);
1081
1082         init_2d_vlc_rl(&rl_mpeg1, 1);
1083         init_2d_vlc_rl(&rl_mpeg2, 1);
1084     }
1085 }
1086
1087 static inline int get_dmv(MpegEncContext *s)
1088 {
1089     if(get_bits1(&s->gb))
1090         return 1 - (get_bits1(&s->gb) << 1);
1091     else
1092         return 0;
1093 }
1094
1095 static inline int get_qscale(MpegEncContext *s)
1096 {
1097     int qscale = get_bits(&s->gb, 5);
1098     if (s->q_scale_type) {
1099         return non_linear_qscale[qscale];
1100     } else {
1101         return qscale << 1;
1102     }
1103 }
1104
1105 /* motion type (for mpeg2) */
1106 #define MT_FIELD 1
1107 #define MT_FRAME 2
1108 #define MT_16X8  2
1109 #define MT_DMV   3
1110
1111 static int mpeg_decode_mb(MpegEncContext *s,
1112                           DCTELEM block[12][64])
1113 {
1114     int i, j, k, cbp, val, mb_type, motion_type;
1115     const int mb_block_count = 4 + (1<< s->chroma_format);
1116
1117     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1118
1119     assert(s->mb_skipped==0);
1120
1121     if (s->mb_skip_run-- != 0) {
1122         if(s->pict_type == I_TYPE){
1123             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1124             return -1;
1125         }
1126
1127         /* skip mb */
1128         s->mb_intra = 0;
1129         for(i=0;i<12;i++)
1130             s->block_last_index[i] = -1;
1131         if(s->picture_structure == PICT_FRAME)
1132             s->mv_type = MV_TYPE_16X16;
1133         else
1134             s->mv_type = MV_TYPE_FIELD;
1135         if (s->pict_type == P_TYPE) {
1136             /* if P type, zero motion vector is implied */
1137             s->mv_dir = MV_DIR_FORWARD;
1138             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1139             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1140             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1141             s->field_select[0][0]= s->picture_structure - 1;
1142             s->mb_skipped = 1;
1143             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1144         } else {
1145             int mb_type;
1146
1147             if(s->mb_x)
1148                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1149             else
1150                 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,
1151             if(IS_INTRA(mb_type))
1152                 return -1;
1153
1154             /* if B type, reuse previous vectors and directions */
1155             s->mv[0][0][0] = s->last_mv[0][0][0];
1156             s->mv[0][0][1] = s->last_mv[0][0][1];
1157             s->mv[1][0][0] = s->last_mv[1][0][0];
1158             s->mv[1][0][1] = s->last_mv[1][0][1];
1159
1160             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1161                 mb_type | MB_TYPE_SKIP;
1162 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1163
1164             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1165                 s->mb_skipped = 1;
1166         }
1167
1168         return 0;
1169     }
1170
1171     switch(s->pict_type) {
1172     default:
1173     case I_TYPE:
1174         if (get_bits1(&s->gb) == 0) {
1175             if (get_bits1(&s->gb) == 0){
1176                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1177                 return -1;
1178             }
1179             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1180         } else {
1181             mb_type = MB_TYPE_INTRA;
1182         }
1183         break;
1184     case P_TYPE:
1185         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1186         if (mb_type < 0){
1187             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1188             return -1;
1189         }
1190         mb_type = ptype2mb_type[ mb_type ];
1191         break;
1192     case B_TYPE:
1193         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1194         if (mb_type < 0){
1195             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1196             return -1;
1197         }
1198         mb_type = btype2mb_type[ mb_type ];
1199         break;
1200     }
1201     dprintf(s->avctx, "mb_type=%x\n", mb_type);
1202 //    motion_type = 0; /* avoid warning */
1203     if (IS_INTRA(mb_type)) {
1204         s->dsp.clear_blocks(s->block[0]);
1205
1206         if(!s->chroma_y_shift){
1207             s->dsp.clear_blocks(s->block[6]);
1208         }
1209
1210         /* compute dct type */
1211         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1212             !s->frame_pred_frame_dct) {
1213             s->interlaced_dct = get_bits1(&s->gb);
1214         }
1215
1216         if (IS_QUANT(mb_type))
1217             s->qscale = get_qscale(s);
1218
1219         if (s->concealment_motion_vectors) {
1220             /* just parse them */
1221             if (s->picture_structure != PICT_FRAME)
1222                 skip_bits1(&s->gb); /* field select */
1223
1224             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1225                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1226             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1227                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1228
1229             skip_bits1(&s->gb); /* marker */
1230         }else
1231             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1232         s->mb_intra = 1;
1233 #ifdef HAVE_XVMC
1234         //one 1 we memcpy blocks in xvmcvideo
1235         if(s->avctx->xvmc_acceleration > 1){
1236             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1237             if(s->swap_uv){
1238                 exchange_uv(s);
1239             }
1240         }
1241 #endif
1242
1243         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1244             if(s->flags2 & CODEC_FLAG2_FAST){
1245                 for(i=0;i<6;i++) {
1246                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1247                 }
1248             }else{
1249                 for(i=0;i<mb_block_count;i++) {
1250                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1251                         return -1;
1252                 }
1253             }
1254         } else {
1255             for(i=0;i<6;i++) {
1256                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1257                     return -1;
1258             }
1259         }
1260     } else {
1261         if (mb_type & MB_TYPE_ZERO_MV){
1262             assert(mb_type & MB_TYPE_CBP);
1263
1264             /* compute dct type */
1265             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1266                 !s->frame_pred_frame_dct) {
1267                 s->interlaced_dct = get_bits1(&s->gb);
1268             }
1269
1270             if (IS_QUANT(mb_type))
1271                 s->qscale = get_qscale(s);
1272
1273             s->mv_dir = MV_DIR_FORWARD;
1274             if(s->picture_structure == PICT_FRAME)
1275                 s->mv_type = MV_TYPE_16X16;
1276             else{
1277                 s->mv_type = MV_TYPE_FIELD;
1278                 mb_type |= MB_TYPE_INTERLACED;
1279                 s->field_select[0][0]= s->picture_structure - 1;
1280             }
1281             s->last_mv[0][0][0] = 0;
1282             s->last_mv[0][0][1] = 0;
1283             s->last_mv[0][1][0] = 0;
1284             s->last_mv[0][1][1] = 0;
1285             s->mv[0][0][0] = 0;
1286             s->mv[0][0][1] = 0;
1287         }else{
1288             assert(mb_type & MB_TYPE_L0L1);
1289 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1290             /* get additionnal motion vector type */
1291             if (s->frame_pred_frame_dct)
1292                 motion_type = MT_FRAME;
1293             else{
1294                 motion_type = get_bits(&s->gb, 2);
1295             }
1296
1297             /* compute dct type */
1298             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1299                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1300                 s->interlaced_dct = get_bits1(&s->gb);
1301             }
1302
1303             if (IS_QUANT(mb_type))
1304                 s->qscale = get_qscale(s);
1305
1306             /* motion vectors */
1307             s->mv_dir = 0;
1308             for(i=0;i<2;i++) {
1309                 if (USES_LIST(mb_type, i)) {
1310                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1311                     dprintf(s->avctx, "motion_type=%d\n", motion_type);
1312                     switch(motion_type) {
1313                     case MT_FRAME: /* or MT_16X8 */
1314                         if (s->picture_structure == PICT_FRAME) {
1315                             /* MT_FRAME */
1316                             mb_type |= MB_TYPE_16x16;
1317                             s->mv_type = MV_TYPE_16X16;
1318                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1319                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1320                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1321                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1322                             /* full_pel: only for mpeg1 */
1323                             if (s->full_pel[i]){
1324                                 s->mv[i][0][0] <<= 1;
1325                                 s->mv[i][0][1] <<= 1;
1326                             }
1327                         } else {
1328                             /* MT_16X8 */
1329                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1330                             s->mv_type = MV_TYPE_16X8;
1331                             for(j=0;j<2;j++) {
1332                                 s->field_select[i][j] = get_bits1(&s->gb);
1333                                 for(k=0;k<2;k++) {
1334                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1335                                                              s->last_mv[i][j][k]);
1336                                     s->last_mv[i][j][k] = val;
1337                                     s->mv[i][j][k] = val;
1338                                 }
1339                             }
1340                         }
1341                         break;
1342                     case MT_FIELD:
1343                         s->mv_type = MV_TYPE_FIELD;
1344                         if (s->picture_structure == PICT_FRAME) {
1345                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1346                             for(j=0;j<2;j++) {
1347                                 s->field_select[i][j] = get_bits1(&s->gb);
1348                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1349                                                          s->last_mv[i][j][0]);
1350                                 s->last_mv[i][j][0] = val;
1351                                 s->mv[i][j][0] = val;
1352                                 dprintf(s->avctx, "fmx=%d\n", val);
1353                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1354                                                          s->last_mv[i][j][1] >> 1);
1355                                 s->last_mv[i][j][1] = val << 1;
1356                                 s->mv[i][j][1] = val;
1357                                 dprintf(s->avctx, "fmy=%d\n", val);
1358                             }
1359                         } else {
1360                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1361                             s->field_select[i][0] = get_bits1(&s->gb);
1362                             for(k=0;k<2;k++) {
1363                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1364                                                          s->last_mv[i][0][k]);
1365                                 s->last_mv[i][0][k] = val;
1366                                 s->last_mv[i][1][k] = val;
1367                                 s->mv[i][0][k] = val;
1368                             }
1369                         }
1370                         break;
1371                     case MT_DMV:
1372                         {
1373                             int dmx, dmy, mx, my, m;
1374
1375                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1376                                                     s->last_mv[i][0][0]);
1377                             s->last_mv[i][0][0] = mx;
1378                             s->last_mv[i][1][0] = mx;
1379                             dmx = get_dmv(s);
1380                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1381                                                     s->last_mv[i][0][1] >> 1);
1382                             dmy = get_dmv(s);
1383                             s->mv_type = MV_TYPE_DMV;
1384
1385
1386                             s->last_mv[i][0][1] = my<<1;
1387                             s->last_mv[i][1][1] = my<<1;
1388
1389                             s->mv[i][0][0] = mx;
1390                             s->mv[i][0][1] = my;
1391                             s->mv[i][1][0] = mx;//not used
1392                             s->mv[i][1][1] = my;//not used
1393
1394                             if (s->picture_structure == PICT_FRAME) {
1395                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1396
1397                                 //m = 1 + 2 * s->top_field_first;
1398                                 m = s->top_field_first ? 1 : 3;
1399
1400                                 /* top -> top pred */
1401                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1402                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1403                                 m = 4 - m;
1404                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1405                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1406                             } else {
1407                                 mb_type |= MB_TYPE_16x16;
1408
1409                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1410                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1411                                 if(s->picture_structure == PICT_TOP_FIELD)
1412                                     s->mv[i][2][1]--;
1413                                 else
1414                                     s->mv[i][2][1]++;
1415                             }
1416                         }
1417                         break;
1418                     default:
1419                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1420                         return -1;
1421                     }
1422                 }
1423             }
1424         }
1425
1426         s->mb_intra = 0;
1427         if (HAS_CBP(mb_type)) {
1428             s->dsp.clear_blocks(s->block[0]);
1429
1430             if(!s->chroma_y_shift){
1431                 s->dsp.clear_blocks(s->block[6]);
1432             }
1433
1434             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1435             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1436                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1437                 return -1;
1438             }
1439             if(mb_block_count > 6){
1440                  cbp<<= mb_block_count-6;
1441                  cbp |= get_bits(&s->gb, mb_block_count-6);
1442             }
1443
1444 #ifdef HAVE_XVMC
1445             //on 1 we memcpy blocks in xvmcvideo
1446             if(s->avctx->xvmc_acceleration > 1){
1447                 XVMC_pack_pblocks(s,cbp);
1448                 if(s->swap_uv){
1449                     exchange_uv(s);
1450                 }
1451             }
1452 #endif
1453
1454             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1455                 if(s->flags2 & CODEC_FLAG2_FAST){
1456                     for(i=0;i<6;i++) {
1457                         if(cbp & 32) {
1458                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1459                         } else {
1460                             s->block_last_index[i] = -1;
1461                         }
1462                         cbp+=cbp;
1463                     }
1464                 }else{
1465                     cbp<<= 12-mb_block_count;
1466
1467                     for(i=0;i<mb_block_count;i++) {
1468                         if ( cbp & (1<<11) ) {
1469                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1470                                 return -1;
1471                         } else {
1472                             s->block_last_index[i] = -1;
1473                         }
1474                         cbp+=cbp;
1475                     }
1476                 }
1477             } else {
1478                 if(s->flags2 & CODEC_FLAG2_FAST){
1479                     for(i=0;i<6;i++) {
1480                         if (cbp & 32) {
1481                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1482                         } else {
1483                             s->block_last_index[i] = -1;
1484                         }
1485                         cbp+=cbp;
1486                     }
1487                 }else{
1488                     for(i=0;i<6;i++) {
1489                         if (cbp & 32) {
1490                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1491                                 return -1;
1492                         } else {
1493                             s->block_last_index[i] = -1;
1494                         }
1495                         cbp+=cbp;
1496                     }
1497                 }
1498             }
1499         }else{
1500             for(i=0;i<12;i++)
1501                 s->block_last_index[i] = -1;
1502         }
1503     }
1504
1505     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1506
1507     return 0;
1508 }
1509
1510 /* as h263, but only 17 codes */
1511 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1512 {
1513     int code, sign, val, l, shift;
1514
1515     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1516     if (code == 0) {
1517         return pred;
1518     }
1519     if (code < 0) {
1520         return 0xffff;
1521     }
1522
1523     sign = get_bits1(&s->gb);
1524     shift = fcode - 1;
1525     val = code;
1526     if (shift) {
1527         val = (val - 1) << shift;
1528         val |= get_bits(&s->gb, shift);
1529         val++;
1530     }
1531     if (sign)
1532         val = -val;
1533     val += pred;
1534
1535     /* modulo decoding */
1536     l= INT_BIT - 5 - shift;
1537     val = (val<<l)>>l;
1538     return val;
1539 }
1540
1541 static inline int decode_dc(GetBitContext *gb, int component)
1542 {
1543     int code, diff;
1544
1545     if (component == 0) {
1546         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1547     } else {
1548         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1549     }
1550     if (code < 0){
1551         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1552         return 0xffff;
1553     }
1554     if (code == 0) {
1555         diff = 0;
1556     } else {
1557         diff = get_xbits(gb, code);
1558     }
1559     return diff;
1560 }
1561
1562 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1563                                DCTELEM *block,
1564                                int n)
1565 {
1566     int level, dc, diff, i, j, run;
1567     int component;
1568     RLTable *rl = &rl_mpeg1;
1569     uint8_t * const scantable= s->intra_scantable.permutated;
1570     const uint16_t *quant_matrix= s->intra_matrix;
1571     const int qscale= s->qscale;
1572
1573     /* DC coef */
1574     component = (n <= 3 ? 0 : n - 4 + 1);
1575     diff = decode_dc(&s->gb, component);
1576     if (diff >= 0xffff)
1577         return -1;
1578     dc = s->last_dc[component];
1579     dc += diff;
1580     s->last_dc[component] = dc;
1581     block[0] = dc<<3;
1582     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
1583     i = 0;
1584     {
1585         OPEN_READER(re, &s->gb);
1586         /* now quantify & encode AC coefs */
1587         for(;;) {
1588             UPDATE_CACHE(re, &s->gb);
1589             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1590
1591             if(level == 127){
1592                 break;
1593             } else if(level != 0) {
1594                 i += run;
1595                 j = scantable[i];
1596                 level= (level*qscale*quant_matrix[j])>>4;
1597                 level= (level-1)|1;
1598                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1599                 LAST_SKIP_BITS(re, &s->gb, 1);
1600             } else {
1601                 /* escape */
1602                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1603                 UPDATE_CACHE(re, &s->gb);
1604                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1605                 if (level == -128) {
1606                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1607                 } else if (level == 0) {
1608                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1609                 }
1610                 i += run;
1611                 j = scantable[i];
1612                 if(level<0){
1613                     level= -level;
1614                     level= (level*qscale*quant_matrix[j])>>4;
1615                     level= (level-1)|1;
1616                     level= -level;
1617                 }else{
1618                     level= (level*qscale*quant_matrix[j])>>4;
1619                     level= (level-1)|1;
1620                 }
1621             }
1622             if (i > 63){
1623                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1624                 return -1;
1625             }
1626
1627             block[j] = level;
1628         }
1629         CLOSE_READER(re, &s->gb);
1630     }
1631     s->block_last_index[n] = i;
1632    return 0;
1633 }
1634
1635 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1636                                DCTELEM *block,
1637                                int n)
1638 {
1639     int level, i, j, run;
1640     RLTable *rl = &rl_mpeg1;
1641     uint8_t * const scantable= s->intra_scantable.permutated;
1642     const uint16_t *quant_matrix= s->inter_matrix;
1643     const int qscale= s->qscale;
1644
1645     {
1646         OPEN_READER(re, &s->gb);
1647         i = -1;
1648         /* special case for the first coef. no need to add a second vlc table */
1649         UPDATE_CACHE(re, &s->gb);
1650         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1651             level= (3*qscale*quant_matrix[0])>>5;
1652             level= (level-1)|1;
1653             if(GET_CACHE(re, &s->gb)&0x40000000)
1654                 level= -level;
1655             block[0] = level;
1656             i++;
1657             SKIP_BITS(re, &s->gb, 2);
1658             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1659                 goto end;
1660         }
1661
1662         /* now quantify & encode AC coefs */
1663         for(;;) {
1664             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1665
1666             if(level != 0) {
1667                 i += run;
1668                 j = scantable[i];
1669                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1670                 level= (level-1)|1;
1671                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1672                 SKIP_BITS(re, &s->gb, 1);
1673             } else {
1674                 /* escape */
1675                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1676                 UPDATE_CACHE(re, &s->gb);
1677                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1678                 if (level == -128) {
1679                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1680                 } else if (level == 0) {
1681                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1682                 }
1683                 i += run;
1684                 j = scantable[i];
1685                 if(level<0){
1686                     level= -level;
1687                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1688                     level= (level-1)|1;
1689                     level= -level;
1690                 }else{
1691                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1692                     level= (level-1)|1;
1693                 }
1694             }
1695             if (i > 63){
1696                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1697                 return -1;
1698             }
1699
1700             block[j] = level;
1701             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1702                 break;
1703             UPDATE_CACHE(re, &s->gb);
1704         }
1705 end:
1706         LAST_SKIP_BITS(re, &s->gb, 2);
1707         CLOSE_READER(re, &s->gb);
1708     }
1709     s->block_last_index[n] = i;
1710     return 0;
1711 }
1712
1713 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1714 {
1715     int level, i, j, run;
1716     RLTable *rl = &rl_mpeg1;
1717     uint8_t * const scantable= s->intra_scantable.permutated;
1718     const int qscale= s->qscale;
1719
1720     {
1721         OPEN_READER(re, &s->gb);
1722         i = -1;
1723         /* special case for the first coef. no need to add a second vlc table */
1724         UPDATE_CACHE(re, &s->gb);
1725         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1726             level= (3*qscale)>>1;
1727             level= (level-1)|1;
1728             if(GET_CACHE(re, &s->gb)&0x40000000)
1729                 level= -level;
1730             block[0] = level;
1731             i++;
1732             SKIP_BITS(re, &s->gb, 2);
1733             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1734                 goto end;
1735         }
1736
1737         /* now quantify & encode AC coefs */
1738         for(;;) {
1739             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1740
1741             if(level != 0) {
1742                 i += run;
1743                 j = scantable[i];
1744                 level= ((level*2+1)*qscale)>>1;
1745                 level= (level-1)|1;
1746                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1747                 SKIP_BITS(re, &s->gb, 1);
1748             } else {
1749                 /* escape */
1750                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1751                 UPDATE_CACHE(re, &s->gb);
1752                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1753                 if (level == -128) {
1754                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1755                 } else if (level == 0) {
1756                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1757                 }
1758                 i += run;
1759                 j = scantable[i];
1760                 if(level<0){
1761                     level= -level;
1762                     level= ((level*2+1)*qscale)>>1;
1763                     level= (level-1)|1;
1764                     level= -level;
1765                 }else{
1766                     level= ((level*2+1)*qscale)>>1;
1767                     level= (level-1)|1;
1768                 }
1769             }
1770
1771             block[j] = level;
1772             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1773                 break;
1774             UPDATE_CACHE(re, &s->gb);
1775         }
1776 end:
1777         LAST_SKIP_BITS(re, &s->gb, 2);
1778         CLOSE_READER(re, &s->gb);
1779     }
1780     s->block_last_index[n] = i;
1781     return 0;
1782 }
1783
1784
1785 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1786                                DCTELEM *block,
1787                                int n)
1788 {
1789     int level, i, j, run;
1790     RLTable *rl = &rl_mpeg1;
1791     uint8_t * const scantable= s->intra_scantable.permutated;
1792     const uint16_t *quant_matrix;
1793     const int qscale= s->qscale;
1794     int mismatch;
1795
1796     mismatch = 1;
1797
1798     {
1799         OPEN_READER(re, &s->gb);
1800         i = -1;
1801         if (n < 4)
1802             quant_matrix = s->inter_matrix;
1803         else
1804             quant_matrix = s->chroma_inter_matrix;
1805
1806         /* special case for the first coef. no need to add a second vlc table */
1807         UPDATE_CACHE(re, &s->gb);
1808         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1809             level= (3*qscale*quant_matrix[0])>>5;
1810             if(GET_CACHE(re, &s->gb)&0x40000000)
1811                 level= -level;
1812             block[0] = level;
1813             mismatch ^= level;
1814             i++;
1815             SKIP_BITS(re, &s->gb, 2);
1816             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1817                 goto end;
1818         }
1819
1820         /* now quantify & encode AC coefs */
1821         for(;;) {
1822             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1823
1824             if(level != 0) {
1825                 i += run;
1826                 j = scantable[i];
1827                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1828                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1829                 SKIP_BITS(re, &s->gb, 1);
1830             } else {
1831                 /* escape */
1832                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1833                 UPDATE_CACHE(re, &s->gb);
1834                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1835
1836                 i += run;
1837                 j = scantable[i];
1838                 if(level<0){
1839                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1840                     level= -level;
1841                 }else{
1842                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1843                 }
1844             }
1845             if (i > 63){
1846                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1847                 return -1;
1848             }
1849
1850             mismatch ^= level;
1851             block[j] = level;
1852             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1853                 break;
1854             UPDATE_CACHE(re, &s->gb);
1855         }
1856 end:
1857         LAST_SKIP_BITS(re, &s->gb, 2);
1858         CLOSE_READER(re, &s->gb);
1859     }
1860     block[63] ^= (mismatch & 1);
1861
1862     s->block_last_index[n] = i;
1863     return 0;
1864 }
1865
1866 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1867                                DCTELEM *block,
1868                                int n)
1869 {
1870     int level, i, j, run;
1871     RLTable *rl = &rl_mpeg1;
1872     uint8_t * const scantable= s->intra_scantable.permutated;
1873     const int qscale= s->qscale;
1874     OPEN_READER(re, &s->gb);
1875     i = -1;
1876
1877     /* special case for the first coef. no need to add a second vlc table */
1878     UPDATE_CACHE(re, &s->gb);
1879     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1880         level= (3*qscale)>>1;
1881         if(GET_CACHE(re, &s->gb)&0x40000000)
1882             level= -level;
1883         block[0] = level;
1884         i++;
1885         SKIP_BITS(re, &s->gb, 2);
1886         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1887             goto end;
1888     }
1889
1890     /* now quantify & encode AC coefs */
1891     for(;;) {
1892         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1893
1894         if(level != 0) {
1895             i += run;
1896             j = scantable[i];
1897             level= ((level*2+1)*qscale)>>1;
1898             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1899             SKIP_BITS(re, &s->gb, 1);
1900         } else {
1901             /* escape */
1902             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1903             UPDATE_CACHE(re, &s->gb);
1904             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1905
1906             i += run;
1907             j = scantable[i];
1908             if(level<0){
1909                 level= ((-level*2+1)*qscale)>>1;
1910                 level= -level;
1911             }else{
1912                 level= ((level*2+1)*qscale)>>1;
1913             }
1914         }
1915
1916         block[j] = level;
1917         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1918             break;
1919         UPDATE_CACHE(re, &s->gb);
1920     }
1921 end:
1922     LAST_SKIP_BITS(re, &s->gb, 2);
1923     CLOSE_READER(re, &s->gb);
1924     s->block_last_index[n] = i;
1925     return 0;
1926 }
1927
1928
1929 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1930                                DCTELEM *block,
1931                                int n)
1932 {
1933     int level, dc, diff, i, j, run;
1934     int component;
1935     RLTable *rl;
1936     uint8_t * const scantable= s->intra_scantable.permutated;
1937     const uint16_t *quant_matrix;
1938     const int qscale= s->qscale;
1939     int mismatch;
1940
1941     /* DC coef */
1942     if (n < 4){
1943         quant_matrix = s->intra_matrix;
1944         component = 0;
1945     }else{
1946         quant_matrix = s->chroma_intra_matrix;
1947         component = (n&1) + 1;
1948     }
1949     diff = decode_dc(&s->gb, component);
1950     if (diff >= 0xffff)
1951         return -1;
1952     dc = s->last_dc[component];
1953     dc += diff;
1954     s->last_dc[component] = dc;
1955     block[0] = dc << (3 - s->intra_dc_precision);
1956     dprintf(s->avctx, "dc=%d\n", block[0]);
1957     mismatch = block[0] ^ 1;
1958     i = 0;
1959     if (s->intra_vlc_format)
1960         rl = &rl_mpeg2;
1961     else
1962         rl = &rl_mpeg1;
1963
1964     {
1965         OPEN_READER(re, &s->gb);
1966         /* now quantify & encode AC coefs */
1967         for(;;) {
1968             UPDATE_CACHE(re, &s->gb);
1969             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1970
1971             if(level == 127){
1972                 break;
1973             } else if(level != 0) {
1974                 i += run;
1975                 j = scantable[i];
1976                 level= (level*qscale*quant_matrix[j])>>4;
1977                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1978                 LAST_SKIP_BITS(re, &s->gb, 1);
1979             } else {
1980                 /* escape */
1981                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1982                 UPDATE_CACHE(re, &s->gb);
1983                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1984                 i += run;
1985                 j = scantable[i];
1986                 if(level<0){
1987                     level= (-level*qscale*quant_matrix[j])>>4;
1988                     level= -level;
1989                 }else{
1990                     level= (level*qscale*quant_matrix[j])>>4;
1991                 }
1992             }
1993             if (i > 63){
1994                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1995                 return -1;
1996             }
1997
1998             mismatch^= level;
1999             block[j] = level;
2000         }
2001         CLOSE_READER(re, &s->gb);
2002     }
2003     block[63]^= mismatch&1;
2004
2005     s->block_last_index[n] = i;
2006     return 0;
2007 }
2008
2009 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
2010                                DCTELEM *block,
2011                                int n)
2012 {
2013     int level, dc, diff, j, run;
2014     int component;
2015     RLTable *rl;
2016     uint8_t * scantable= s->intra_scantable.permutated;
2017     const uint16_t *quant_matrix;
2018     const int qscale= s->qscale;
2019
2020     /* DC coef */
2021     if (n < 4){
2022         quant_matrix = s->intra_matrix;
2023         component = 0;
2024     }else{
2025         quant_matrix = s->chroma_intra_matrix;
2026         component = (n&1) + 1;
2027     }
2028     diff = decode_dc(&s->gb, component);
2029     if (diff >= 0xffff)
2030         return -1;
2031     dc = s->last_dc[component];
2032     dc += diff;
2033     s->last_dc[component] = dc;
2034     block[0] = dc << (3 - s->intra_dc_precision);
2035     if (s->intra_vlc_format)
2036         rl = &rl_mpeg2;
2037     else
2038         rl = &rl_mpeg1;
2039
2040     {
2041         OPEN_READER(re, &s->gb);
2042         /* now quantify & encode AC coefs */
2043         for(;;) {
2044             UPDATE_CACHE(re, &s->gb);
2045             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2046
2047             if(level == 127){
2048                 break;
2049             } else if(level != 0) {
2050                 scantable += run;
2051                 j = *scantable;
2052                 level= (level*qscale*quant_matrix[j])>>4;
2053                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2054                 LAST_SKIP_BITS(re, &s->gb, 1);
2055             } else {
2056                 /* escape */
2057                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2058                 UPDATE_CACHE(re, &s->gb);
2059                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2060                 scantable += run;
2061                 j = *scantable;
2062                 if(level<0){
2063                     level= (-level*qscale*quant_matrix[j])>>4;
2064                     level= -level;
2065                 }else{
2066                     level= (level*qscale*quant_matrix[j])>>4;
2067                 }
2068             }
2069
2070             block[j] = level;
2071         }
2072         CLOSE_READER(re, &s->gb);
2073     }
2074
2075     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2076     return 0;
2077 }
2078
2079 typedef struct Mpeg1Context {
2080     MpegEncContext mpeg_enc_ctx;
2081     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2082     int repeat_field; /* true if we must repeat the field */
2083     AVPanScan pan_scan; /** some temporary storage for the panscan */
2084     int slice_count;
2085     int swap_uv;//indicate VCR2
2086     int save_aspect_info;
2087     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2088
2089 } Mpeg1Context;
2090
2091 static int mpeg_decode_init(AVCodecContext *avctx)
2092 {
2093     Mpeg1Context *s = avctx->priv_data;
2094     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2095     int i;
2096
2097     //we need some parmutation to store
2098     //matrixes, until MPV_common_init()
2099     //set the real permutatuon
2100     for(i=0;i<64;i++)
2101        s2->dsp.idct_permutation[i]=i;
2102
2103     MPV_decode_defaults(s2);
2104
2105     s->mpeg_enc_ctx.avctx= avctx;
2106     s->mpeg_enc_ctx.flags= avctx->flags;
2107     s->mpeg_enc_ctx.flags2= avctx->flags2;
2108     common_init(&s->mpeg_enc_ctx);
2109     init_vlcs();
2110
2111     s->mpeg_enc_ctx_allocated = 0;
2112     s->mpeg_enc_ctx.picture_number = 0;
2113     s->repeat_field = 0;
2114     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2115     return 0;
2116 }
2117
2118 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2119                                      const uint8_t *new_perm){
2120     uint16_t temp_matrix[64];
2121     int i;
2122
2123     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2124
2125     for(i=0;i<64;i++){
2126         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2127     }
2128 }
2129
2130 //Call this function when we know all parameters
2131 //it may be called in different places for mpeg1 and mpeg2
2132 static int mpeg_decode_postinit(AVCodecContext *avctx){
2133     Mpeg1Context *s1 = avctx->priv_data;
2134     MpegEncContext *s = &s1->mpeg_enc_ctx;
2135     uint8_t old_permutation[64];
2136
2137     if (
2138         (s1->mpeg_enc_ctx_allocated == 0)||
2139         avctx->coded_width  != s->width ||
2140         avctx->coded_height != s->height||
2141         s1->save_aspect_info != s->aspect_ratio_info||
2142         0)
2143     {
2144
2145         if (s1->mpeg_enc_ctx_allocated) {
2146             ParseContext pc= s->parse_context;
2147             s->parse_context.buffer=0;
2148             MPV_common_end(s);
2149             s->parse_context= pc;
2150         }
2151
2152         if( (s->width == 0 )||(s->height == 0))
2153             return -2;
2154
2155         avcodec_set_dimensions(avctx, s->width, s->height);
2156         avctx->bit_rate = s->bit_rate;
2157         s1->save_aspect_info = s->aspect_ratio_info;
2158
2159      //low_delay may be forced, in this case we will have B frames
2160      //that behave like P frames
2161         avctx->has_b_frames = !(s->low_delay);
2162
2163         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2164             //mpeg1 fps
2165             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2166             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2167             //mpeg1 aspect
2168             avctx->sample_aspect_ratio= av_d2q(
2169                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2170
2171         }else{//mpeg2
2172         //mpeg2 fps
2173             av_reduce(
2174                 &s->avctx->time_base.den,
2175                 &s->avctx->time_base.num,
2176                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2177                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2178                 1<<30);
2179         //mpeg2 aspect
2180             if(s->aspect_ratio_info > 1){
2181                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2182                     s->avctx->sample_aspect_ratio=
2183                         av_div_q(
2184                          mpeg2_aspect[s->aspect_ratio_info],
2185                          (AVRational){s->width, s->height}
2186                          );
2187                 }else{
2188                     s->avctx->sample_aspect_ratio=
2189                         av_div_q(
2190                          mpeg2_aspect[s->aspect_ratio_info],
2191                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2192                         );
2193                 }
2194             }else{
2195                 s->avctx->sample_aspect_ratio=
2196                     mpeg2_aspect[s->aspect_ratio_info];
2197             }
2198         }//mpeg2
2199
2200         if(avctx->xvmc_acceleration){
2201             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2202         }else{
2203             if(s->chroma_format <  2){
2204                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2205             }else
2206             if(s->chroma_format == 2){
2207                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2208             }else
2209             if(s->chroma_format >  2){
2210                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2211             }
2212         }
2213         //until then pix_fmt may be changed right after codec init
2214         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2215             if( avctx->idct_algo == FF_IDCT_AUTO )
2216                 avctx->idct_algo = FF_IDCT_SIMPLE;
2217
2218         //quantization matrixes may need reordering
2219         //if dct permutation is changed
2220         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2221
2222         if (MPV_common_init(s) < 0)
2223             return -2;
2224
2225         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2226         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2227         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2228         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2229
2230         s1->mpeg_enc_ctx_allocated = 1;
2231     }
2232     return 0;
2233 }
2234
2235 static int mpeg1_decode_picture(AVCodecContext *avctx,
2236                                 const uint8_t *buf, int buf_size)
2237 {
2238     Mpeg1Context *s1 = avctx->priv_data;
2239     MpegEncContext *s = &s1->mpeg_enc_ctx;
2240     int ref, f_code, vbv_delay;
2241
2242     if(mpeg_decode_postinit(s->avctx) < 0)
2243        return -2;
2244
2245     init_get_bits(&s->gb, buf, buf_size*8);
2246
2247     ref = get_bits(&s->gb, 10); /* temporal ref */
2248     s->pict_type = get_bits(&s->gb, 3);
2249     if(s->pict_type == 0 || s->pict_type > 3)
2250         return -1;
2251
2252     vbv_delay= get_bits(&s->gb, 16);
2253     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2254         s->full_pel[0] = get_bits1(&s->gb);
2255         f_code = get_bits(&s->gb, 3);
2256         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2257             return -1;
2258         s->mpeg_f_code[0][0] = f_code;
2259         s->mpeg_f_code[0][1] = f_code;
2260     }
2261     if (s->pict_type == B_TYPE) {
2262         s->full_pel[1] = get_bits1(&s->gb);
2263         f_code = get_bits(&s->gb, 3);
2264         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2265             return -1;
2266         s->mpeg_f_code[1][0] = f_code;
2267         s->mpeg_f_code[1][1] = f_code;
2268     }
2269     s->current_picture.pict_type= s->pict_type;
2270     s->current_picture.key_frame= s->pict_type == I_TYPE;
2271
2272     if(avctx->debug & FF_DEBUG_PICT_INFO)
2273         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2274
2275     s->y_dc_scale = 8;
2276     s->c_dc_scale = 8;
2277     s->first_slice = 1;
2278     return 0;
2279 }
2280
2281 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2282 {
2283     MpegEncContext *s= &s1->mpeg_enc_ctx;
2284     int horiz_size_ext, vert_size_ext;
2285     int bit_rate_ext;
2286
2287     skip_bits(&s->gb, 1); /* profil and level esc*/
2288     s->avctx->profile= get_bits(&s->gb, 3);
2289     s->avctx->level= get_bits(&s->gb, 4);
2290     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2291     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2292     horiz_size_ext = get_bits(&s->gb, 2);
2293     vert_size_ext = get_bits(&s->gb, 2);
2294     s->width |= (horiz_size_ext << 12);
2295     s->height |= (vert_size_ext << 12);
2296     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2297     s->bit_rate += (bit_rate_ext << 18) * 400;
2298     skip_bits1(&s->gb); /* marker */
2299     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2300
2301     s->low_delay = get_bits1(&s->gb);
2302     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2303
2304     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2305     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2306
2307     dprintf(s->avctx, "sequence extension\n");
2308     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2309     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2310
2311     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2312         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2313                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2314
2315 }
2316
2317 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2318 {
2319     MpegEncContext *s= &s1->mpeg_enc_ctx;
2320     int color_description, w, h;
2321
2322     skip_bits(&s->gb, 3); /* video format */
2323     color_description= get_bits1(&s->gb);
2324     if(color_description){
2325         skip_bits(&s->gb, 8); /* color primaries */
2326         skip_bits(&s->gb, 8); /* transfer_characteristics */
2327         skip_bits(&s->gb, 8); /* matrix_coefficients */
2328     }
2329     w= get_bits(&s->gb, 14);
2330     skip_bits(&s->gb, 1); //marker
2331     h= get_bits(&s->gb, 14);
2332     skip_bits(&s->gb, 1); //marker
2333
2334     s1->pan_scan.width= 16*w;
2335     s1->pan_scan.height=16*h;
2336
2337     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2338         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2339 }
2340
2341 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2342 {
2343     MpegEncContext *s= &s1->mpeg_enc_ctx;
2344     int i,nofco;
2345
2346     nofco = 1;
2347     if(s->progressive_sequence){
2348         if(s->repeat_first_field){
2349             nofco++;
2350             if(s->top_field_first)
2351                 nofco++;
2352         }
2353     }else{
2354         if(s->picture_structure == PICT_FRAME){
2355             nofco++;
2356             if(s->repeat_first_field)
2357                 nofco++;
2358         }
2359     }
2360     for(i=0; i<nofco; i++){
2361         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2362         skip_bits(&s->gb, 1); //marker
2363         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2364         skip_bits(&s->gb, 1); //marker
2365     }
2366
2367     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2368         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2369             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2370             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2371             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2372         );
2373 }
2374
2375 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2376 {
2377     int i, v, j;
2378
2379     dprintf(s->avctx, "matrix extension\n");
2380
2381     if (get_bits1(&s->gb)) {
2382         for(i=0;i<64;i++) {
2383             v = get_bits(&s->gb, 8);
2384             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2385             s->intra_matrix[j] = v;
2386             s->chroma_intra_matrix[j] = v;
2387         }
2388     }
2389     if (get_bits1(&s->gb)) {
2390         for(i=0;i<64;i++) {
2391             v = get_bits(&s->gb, 8);
2392             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2393             s->inter_matrix[j] = v;
2394             s->chroma_inter_matrix[j] = v;
2395         }
2396     }
2397     if (get_bits1(&s->gb)) {
2398         for(i=0;i<64;i++) {
2399             v = get_bits(&s->gb, 8);
2400             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2401             s->chroma_intra_matrix[j] = v;
2402         }
2403     }
2404     if (get_bits1(&s->gb)) {
2405         for(i=0;i<64;i++) {
2406             v = get_bits(&s->gb, 8);
2407             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2408             s->chroma_inter_matrix[j] = v;
2409         }
2410     }
2411 }
2412
2413 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2414 {
2415     s->full_pel[0] = s->full_pel[1] = 0;
2416     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2417     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2418     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2419     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2420     s->intra_dc_precision = get_bits(&s->gb, 2);
2421     s->picture_structure = get_bits(&s->gb, 2);
2422     s->top_field_first = get_bits1(&s->gb);
2423     s->frame_pred_frame_dct = get_bits1(&s->gb);
2424     s->concealment_motion_vectors = get_bits1(&s->gb);
2425     s->q_scale_type = get_bits1(&s->gb);
2426     s->intra_vlc_format = get_bits1(&s->gb);
2427     s->alternate_scan = get_bits1(&s->gb);
2428     s->repeat_first_field = get_bits1(&s->gb);
2429     s->chroma_420_type = get_bits1(&s->gb);
2430     s->progressive_frame = get_bits1(&s->gb);
2431
2432     if(s->picture_structure == PICT_FRAME){
2433         s->first_field=0;
2434         s->v_edge_pos= 16*s->mb_height;
2435     }else{
2436         s->first_field ^= 1;
2437         s->v_edge_pos=  8*s->mb_height;
2438         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2439     }
2440
2441     if(s->alternate_scan){
2442         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2443         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2444     }else{
2445         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2446         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2447     }
2448
2449     /* composite display not parsed */
2450     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
2451     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
2452     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
2453     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
2454     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
2455     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
2456     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
2457     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2458     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
2459 }
2460
2461 static void mpeg_decode_extension(AVCodecContext *avctx,
2462                                   const uint8_t *buf, int buf_size)
2463 {
2464     Mpeg1Context *s1 = avctx->priv_data;
2465     MpegEncContext *s = &s1->mpeg_enc_ctx;
2466     int ext_type;
2467
2468     init_get_bits(&s->gb, buf, buf_size*8);
2469
2470     ext_type = get_bits(&s->gb, 4);
2471     switch(ext_type) {
2472     case 0x1:
2473         mpeg_decode_sequence_extension(s1);
2474         break;
2475     case 0x2:
2476         mpeg_decode_sequence_display_extension(s1);
2477         break;
2478     case 0x3:
2479         mpeg_decode_quant_matrix_extension(s);
2480         break;
2481     case 0x7:
2482         mpeg_decode_picture_display_extension(s1);
2483         break;
2484     case 0x8:
2485         mpeg_decode_picture_coding_extension(s);
2486         break;
2487     }
2488 }
2489
2490 static void exchange_uv(MpegEncContext *s){
2491     short * tmp = s->pblocks[4];
2492     s->pblocks[4] = s->pblocks[5];
2493     s->pblocks[5] = tmp;
2494 }
2495
2496 static int mpeg_field_start(MpegEncContext *s){
2497     AVCodecContext *avctx= s->avctx;
2498     Mpeg1Context *s1 = (Mpeg1Context*)s;
2499
2500     /* start frame decoding */
2501     if(s->first_field || s->picture_structure==PICT_FRAME){
2502         if(MPV_frame_start(s, avctx) < 0)
2503             return -1;
2504
2505         ff_er_frame_start(s);
2506
2507         /* first check if we must repeat the frame */
2508         s->current_picture_ptr->repeat_pict = 0;
2509         if (s->repeat_first_field) {
2510             if (s->progressive_sequence) {
2511                 if (s->top_field_first)
2512                     s->current_picture_ptr->repeat_pict = 4;
2513                 else
2514                     s->current_picture_ptr->repeat_pict = 2;
2515             } else if (s->progressive_frame) {
2516                 s->current_picture_ptr->repeat_pict = 1;
2517             }
2518         }
2519
2520         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2521     }else{ //second field
2522             int i;
2523
2524             if(!s->current_picture_ptr){
2525                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2526                 return -1;
2527             }
2528
2529             for(i=0; i<4; i++){
2530                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2531                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2532                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2533                 }
2534             }
2535     }
2536 #ifdef HAVE_XVMC
2537 // MPV_frame_start will call this function too,
2538 // but we need to call it on every field
2539     if(s->avctx->xvmc_acceleration)
2540          XVMC_field_start(s,avctx);
2541 #endif
2542
2543     return 0;
2544 }
2545
2546 #define DECODE_SLICE_ERROR -1
2547 #define DECODE_SLICE_OK 0
2548
2549 /**
2550  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2551  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2552  *         DECODE_SLICE_OK if this slice is ok<br>
2553  */
2554 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2555                              const uint8_t **buf, int buf_size)
2556 {
2557     MpegEncContext *s = &s1->mpeg_enc_ctx;
2558     AVCodecContext *avctx= s->avctx;
2559     int ret;
2560     const int field_pic= s->picture_structure != PICT_FRAME;
2561     const int lowres= s->avctx->lowres;
2562
2563     s->resync_mb_x=
2564     s->resync_mb_y= -1;
2565
2566     if (mb_y<<field_pic >= s->mb_height){
2567         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2568         return -1;
2569     }
2570
2571     init_get_bits(&s->gb, *buf, buf_size*8);
2572
2573     ff_mpeg1_clean_buffers(s);
2574     s->interlaced_dct = 0;
2575
2576     s->qscale = get_qscale(s);
2577
2578     if(s->qscale == 0){
2579         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2580         return -1;
2581     }
2582
2583     /* extra slice info */
2584     while (get_bits1(&s->gb) != 0) {
2585         skip_bits(&s->gb, 8);
2586     }
2587
2588     s->mb_x=0;
2589
2590     for(;;) {
2591         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2592         if (code < 0){
2593             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2594             return -1;
2595         }
2596         if (code >= 33) {
2597             if (code == 33) {
2598                 s->mb_x += 33;
2599             }
2600             /* otherwise, stuffing, nothing to do */
2601         } else {
2602             s->mb_x += code;
2603             break;
2604         }
2605     }
2606     if(s->mb_x >= (unsigned)s->mb_width){
2607         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
2608         return -1;
2609     }
2610
2611     s->resync_mb_x= s->mb_x;
2612     s->resync_mb_y= s->mb_y= mb_y;
2613     s->mb_skip_run= 0;
2614     ff_init_block_index(s);
2615
2616     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2617         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2618              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",
2619                  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],
2620                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2621                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2622                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2623                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2624         }
2625     }
2626
2627     for(;;) {
2628 #ifdef HAVE_XVMC
2629         //one 1 we memcpy blocks in xvmcvideo
2630         if(s->avctx->xvmc_acceleration > 1)
2631             XVMC_init_block(s);//set s->block
2632 #endif
2633
2634         ret = mpeg_decode_mb(s, s->block);
2635         s->chroma_qscale= s->qscale;
2636
2637         dprintf(s->avctx, "ret=%d\n", ret);
2638         if (ret < 0)
2639             return -1;
2640
2641         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2642             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2643             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2644             int motion_x, motion_y, dir, i;
2645             if(field_pic && !s->first_field)
2646                 xy += wrap/2;
2647
2648             for(i=0; i<2; i++){
2649                 for(dir=0; dir<2; dir++){
2650                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2651                         motion_x = motion_y = 0;
2652                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2653                         motion_x = s->mv[dir][0][0];
2654                         motion_y = s->mv[dir][0][1];
2655                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2656                         motion_x = s->mv[dir][i][0];
2657                         motion_y = s->mv[dir][i][1];
2658                     }
2659
2660                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2661                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2662                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2663                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2664                     s->current_picture.ref_index [dir][xy    ]=
2665                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2666                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2667                 }
2668                 xy += wrap;
2669             }
2670         }
2671
2672         s->dest[0] += 16 >> lowres;
2673         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2674         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2675
2676         MPV_decode_mb(s, s->block);
2677
2678         if (++s->mb_x >= s->mb_width) {
2679             const int mb_size= 16>>s->avctx->lowres;
2680
2681             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2682
2683             s->mb_x = 0;
2684             s->mb_y++;
2685
2686             if(s->mb_y<<field_pic >= s->mb_height){
2687                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2688                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2689                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2690                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2691
2692                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2693                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2694                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2695                     return -1;
2696                 }else
2697                     goto eos;
2698             }
2699
2700             ff_init_block_index(s);
2701         }
2702
2703         /* skip mb handling */
2704         if (s->mb_skip_run == -1) {
2705             /* read again increment */
2706             s->mb_skip_run = 0;
2707             for(;;) {
2708                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2709                 if (code < 0){
2710                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2711                     return -1;
2712                 }
2713                 if (code >= 33) {
2714                     if (code == 33) {
2715                         s->mb_skip_run += 33;
2716                     }else if(code == 35){
2717                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2718                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2719                             return -1;
2720                         }
2721                         goto eos; /* end of slice */
2722                     }
2723                     /* otherwise, stuffing, nothing to do */
2724                 } else {
2725                     s->mb_skip_run += code;
2726                     break;
2727                 }
2728             }
2729         }
2730     }
2731 eos: // end of slice
2732     *buf += get_bits_count(&s->gb)/8 - 1;
2733 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2734     return 0;
2735 }
2736
2737 static int slice_decode_thread(AVCodecContext *c, void *arg){
2738     MpegEncContext *s= arg;
2739     const uint8_t *buf= s->gb.buffer;
2740     int mb_y= s->start_mb_y;
2741
2742     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2743
2744     for(;;){
2745         uint32_t start_code;
2746         int ret;
2747
2748         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2749         emms_c();
2750 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2751 //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);
2752         if(ret < 0){
2753             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2754                 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);
2755         }else{
2756             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);
2757         }
2758
2759         if(s->mb_y == s->end_mb_y)
2760             return 0;
2761
2762         start_code= -1;
2763         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2764         mb_y= start_code - SLICE_MIN_START_CODE;
2765         if(mb_y < 0 || mb_y >= s->end_mb_y)
2766             return -1;
2767     }
2768
2769     return 0; //not reached
2770 }
2771
2772 /**
2773  * handles slice ends.
2774  * @return 1 if it seems to be the last slice of
2775  */
2776 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2777 {
2778     Mpeg1Context *s1 = avctx->priv_data;
2779     MpegEncContext *s = &s1->mpeg_enc_ctx;
2780
2781     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2782         return 0;
2783
2784 #ifdef HAVE_XVMC
2785     if(s->avctx->xvmc_acceleration)
2786         XVMC_field_end(s);
2787 #endif
2788     /* end of slice reached */
2789     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2790         /* end of image */
2791
2792         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2793
2794         ff_er_frame_end(s);
2795
2796         MPV_frame_end(s);
2797
2798         if (s->pict_type == B_TYPE || s->low_delay) {
2799             *pict= *(AVFrame*)s->current_picture_ptr;
2800             ff_print_debug_info(s, pict);
2801         } else {
2802             s->picture_number++;
2803             /* latency of 1 frame for I and P frames */
2804             /* XXX: use another variable than picture_number */
2805             if (s->last_picture_ptr != NULL) {
2806                 *pict= *(AVFrame*)s->last_picture_ptr;
2807                  ff_print_debug_info(s, pict);
2808             }
2809         }
2810
2811         return 1;
2812     } else {
2813         return 0;
2814     }
2815 }
2816
2817 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2818                                  const uint8_t *buf, int buf_size)
2819 {
2820     Mpeg1Context *s1 = avctx->priv_data;
2821     MpegEncContext *s = &s1->mpeg_enc_ctx;
2822     int width,height;
2823     int i, v, j;
2824
2825     init_get_bits(&s->gb, buf, buf_size*8);
2826
2827     width = get_bits(&s->gb, 12);
2828     height = get_bits(&s->gb, 12);
2829     if (width <= 0 || height <= 0 ||
2830         (width % 2) != 0 || (height % 2) != 0)
2831         return -1;
2832     s->aspect_ratio_info= get_bits(&s->gb, 4);
2833     if (s->aspect_ratio_info == 0)
2834         return -1;
2835     s->frame_rate_index = get_bits(&s->gb, 4);
2836     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2837         return -1;
2838     s->bit_rate = get_bits(&s->gb, 18) * 400;
2839     if (get_bits1(&s->gb) == 0) /* marker */
2840         return -1;
2841     s->width = width;
2842     s->height = height;
2843
2844     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2845     skip_bits(&s->gb, 1);
2846
2847     /* get matrix */
2848     if (get_bits1(&s->gb)) {
2849         for(i=0;i<64;i++) {
2850             v = get_bits(&s->gb, 8);
2851             if(v==0){
2852                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2853                 return -1;
2854             }
2855             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2856             s->intra_matrix[j] = v;
2857             s->chroma_intra_matrix[j] = v;
2858         }
2859 #ifdef DEBUG
2860         dprintf(s->avctx, "intra matrix present\n");
2861         for(i=0;i<64;i++)
2862             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2863         dprintf(s->avctx, "\n");
2864 #endif
2865     } else {
2866         for(i=0;i<64;i++) {
2867             j = s->dsp.idct_permutation[i];
2868             v = ff_mpeg1_default_intra_matrix[i];
2869             s->intra_matrix[j] = v;
2870             s->chroma_intra_matrix[j] = v;
2871         }
2872     }
2873     if (get_bits1(&s->gb)) {
2874         for(i=0;i<64;i++) {
2875             v = get_bits(&s->gb, 8);
2876             if(v==0){
2877                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2878                 return -1;
2879             }
2880             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2881             s->inter_matrix[j] = v;
2882             s->chroma_inter_matrix[j] = v;
2883         }
2884 #ifdef DEBUG
2885         dprintf(s->avctx, "non intra matrix present\n");
2886         for(i=0;i<64;i++)
2887             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2888         dprintf(s->avctx, "\n");
2889 #endif
2890     } else {
2891         for(i=0;i<64;i++) {
2892             int j= s->dsp.idct_permutation[i];
2893             v = ff_mpeg1_default_non_intra_matrix[i];
2894             s->inter_matrix[j] = v;
2895             s->chroma_inter_matrix[j] = v;
2896         }
2897     }
2898
2899     if(show_bits(&s->gb, 23) != 0){
2900         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2901         return -1;
2902     }
2903
2904     /* we set mpeg2 parameters so that it emulates mpeg1 */
2905     s->progressive_sequence = 1;
2906     s->progressive_frame = 1;
2907     s->picture_structure = PICT_FRAME;
2908     s->frame_pred_frame_dct = 1;
2909     s->chroma_format = 1;
2910     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2911     avctx->sub_id = 1; /* indicates mpeg1 */
2912     s->out_format = FMT_MPEG1;
2913     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2914     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2915
2916     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2917         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2918                s->avctx->rc_buffer_size, s->bit_rate);
2919
2920     return 0;
2921 }
2922
2923 static int vcr2_init_sequence(AVCodecContext *avctx)
2924 {
2925     Mpeg1Context *s1 = avctx->priv_data;
2926     MpegEncContext *s = &s1->mpeg_enc_ctx;
2927     int i, v;
2928
2929     /* start new mpeg1 context decoding */
2930     s->out_format = FMT_MPEG1;
2931     if (s1->mpeg_enc_ctx_allocated) {
2932         MPV_common_end(s);
2933     }
2934     s->width  = avctx->coded_width;
2935     s->height = avctx->coded_height;
2936     avctx->has_b_frames= 0; //true?
2937     s->low_delay= 1;
2938
2939     if(avctx->xvmc_acceleration){
2940         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2941     }else{
2942         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2943     }
2944
2945     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2946         if( avctx->idct_algo == FF_IDCT_AUTO )
2947             avctx->idct_algo = FF_IDCT_SIMPLE;
2948
2949     if (MPV_common_init(s) < 0)
2950         return -1;
2951     exchange_uv(s);//common init reset pblocks, so we swap them here
2952     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2953     s1->mpeg_enc_ctx_allocated = 1;
2954
2955     for(i=0;i<64;i++) {
2956         int j= s->dsp.idct_permutation[i];
2957         v = ff_mpeg1_default_intra_matrix[i];
2958         s->intra_matrix[j] = v;
2959         s->chroma_intra_matrix[j] = v;
2960
2961         v = ff_mpeg1_default_non_intra_matrix[i];
2962         s->inter_matrix[j] = v;
2963         s->chroma_inter_matrix[j] = v;
2964     }
2965
2966     s->progressive_sequence = 1;
2967     s->progressive_frame = 1;
2968     s->picture_structure = PICT_FRAME;
2969     s->frame_pred_frame_dct = 1;
2970     s->chroma_format = 1;
2971     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2972     avctx->sub_id = 2; /* indicates mpeg2 */
2973     return 0;
2974 }
2975
2976
2977 static void mpeg_decode_user_data(AVCodecContext *avctx,
2978                                   const uint8_t *buf, int buf_size)
2979 {
2980     const uint8_t *p;
2981     int len, flags;
2982     p = buf;
2983     len = buf_size;
2984
2985     /* we parse the DTG active format information */
2986     if (len >= 5 &&
2987         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2988         flags = p[4];
2989         p += 5;
2990         len -= 5;
2991         if (flags & 0x80) {
2992             /* skip event id */
2993             if (len < 2)
2994                 return;
2995             p += 2;
2996             len -= 2;
2997         }
2998         if (flags & 0x40) {
2999             if (len < 1)
3000                 return;
3001             avctx->dtg_active_format = p[0] & 0x0f;
3002         }
3003     }
3004 }
3005
3006 static void mpeg_decode_gop(AVCodecContext *avctx,
3007                             const uint8_t *buf, int buf_size){
3008     Mpeg1Context *s1 = avctx->priv_data;
3009     MpegEncContext *s = &s1->mpeg_enc_ctx;
3010
3011     int drop_frame_flag;
3012     int time_code_hours, time_code_minutes;
3013     int time_code_seconds, time_code_pictures;
3014     int broken_link;
3015
3016     init_get_bits(&s->gb, buf, buf_size*8);
3017
3018     drop_frame_flag = get_bits1(&s->gb);
3019
3020     time_code_hours=get_bits(&s->gb,5);
3021     time_code_minutes = get_bits(&s->gb,6);
3022     skip_bits1(&s->gb);//marker bit
3023     time_code_seconds = get_bits(&s->gb,6);
3024     time_code_pictures = get_bits(&s->gb,6);
3025
3026     /*broken_link indicate that after editing the
3027       reference frames of the first B-Frames after GOP I-Frame
3028       are missing (open gop)*/
3029     broken_link = get_bits1(&s->gb);
3030
3031     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
3032         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
3033             time_code_hours, time_code_minutes, time_code_seconds,
3034             time_code_pictures, broken_link);
3035 }
3036 /**
3037  * finds the end of the current frame in the bitstream.
3038  * @return the position of the first byte of the next frame, or -1
3039  */
3040 static int mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
3041 {
3042     int i;
3043     uint32_t state= pc->state;
3044
3045     i=0;
3046     if(!pc->frame_start_found){
3047         for(i=0; i<buf_size; i++){
3048             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3049             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3050                 i++;
3051                 pc->frame_start_found=1;
3052                 break;
3053             }
3054         }
3055     }
3056
3057     if(pc->frame_start_found){
3058         /* EOF considered as end of frame */
3059         if (buf_size == 0)
3060             return 0;
3061         for(; i<buf_size; i++){
3062             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3063             if((state&0xFFFFFF00) == 0x100){
3064                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3065                     pc->frame_start_found=0;
3066                     pc->state=-1;
3067                     return i-3;
3068                 }
3069             }
3070         }
3071     }
3072     pc->state= state;
3073     return END_NOT_FOUND;
3074 }
3075
3076 /* handle buffering and image synchronisation */
3077 static int mpeg_decode_frame(AVCodecContext *avctx,
3078                              void *data, int *data_size,
3079                              uint8_t *buf, int buf_size)
3080 {
3081     Mpeg1Context *s = avctx->priv_data;
3082     const uint8_t *buf_end;
3083     const uint8_t *buf_ptr;
3084     uint32_t start_code;
3085     int ret, input_size;
3086     AVFrame *picture = data;
3087     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3088     dprintf(avctx, "fill_buffer\n");
3089
3090     if (buf_size == 0) {
3091         /* special case for last picture */
3092         if (s2->low_delay==0 && s2->next_picture_ptr) {
3093             *picture= *(AVFrame*)s2->next_picture_ptr;
3094             s2->next_picture_ptr= NULL;
3095
3096             *data_size = sizeof(AVFrame);
3097         }
3098         return 0;
3099     }
3100
3101     if(s2->flags&CODEC_FLAG_TRUNCATED){
3102         int next= mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3103
3104         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3105             return buf_size;
3106     }
3107
3108     buf_ptr = buf;
3109     buf_end = buf + buf_size;
3110
3111 #if 0
3112     if (s->repeat_field % 2 == 1) {
3113         s->repeat_field++;
3114         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3115         //        s2->picture_number, s->repeat_field);
3116         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3117             *data_size = sizeof(AVPicture);
3118             goto the_end;
3119         }
3120     }
3121 #endif
3122
3123     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3124         vcr2_init_sequence(avctx);
3125
3126     s->slice_count= 0;
3127
3128     for(;;) {
3129         /* find start next code */
3130         start_code = -1;
3131         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3132         if (start_code > 0x1ff){
3133             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3134                 if(avctx->thread_count > 1){
3135                     int i;
3136
3137                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3138                     for(i=0; i<s->slice_count; i++)
3139                         s2->error_count += s2->thread_context[i]->error_count;
3140                 }
3141                 if (slice_end(avctx, picture)) {
3142                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3143                         *data_size = sizeof(AVPicture);
3144                 }
3145             }
3146             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3147         }
3148
3149         input_size = buf_end - buf_ptr;
3150
3151         if(avctx->debug & FF_DEBUG_STARTCODE){
3152             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3153         }
3154
3155         /* prepare data for next start code */
3156         switch(start_code) {
3157         case SEQ_START_CODE:
3158             mpeg1_decode_sequence(avctx, buf_ptr,
3159                                     input_size);
3160             break;
3161
3162         case PICTURE_START_CODE:
3163             /* we have a complete image : we try to decompress it */
3164             mpeg1_decode_picture(avctx,
3165                                     buf_ptr, input_size);
3166             break;
3167         case EXT_START_CODE:
3168             mpeg_decode_extension(avctx,
3169                                     buf_ptr, input_size);
3170             break;
3171         case USER_START_CODE:
3172             mpeg_decode_user_data(avctx,
3173                                     buf_ptr, input_size);
3174             break;
3175         case GOP_START_CODE:
3176             s2->first_field=0;
3177             mpeg_decode_gop(avctx,
3178                                     buf_ptr, input_size);
3179             break;
3180         default:
3181             if (start_code >= SLICE_MIN_START_CODE &&
3182                 start_code <= SLICE_MAX_START_CODE) {
3183                 int mb_y= start_code - SLICE_MIN_START_CODE;
3184
3185                 if(s2->last_picture_ptr==NULL){
3186                 /* skip b frames if we dont have reference frames */
3187                     if(s2->pict_type==B_TYPE) break;
3188                 /* skip P frames if we dont have reference frame no valid header */
3189 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3190                 }
3191                 /* skip b frames if we are in a hurry */
3192                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3193                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3194                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3195                     || avctx->skip_frame >= AVDISCARD_ALL)
3196                     break;
3197                 /* skip everything if we are in a hurry>=5 */
3198                 if(avctx->hurry_up>=5) break;
3199
3200                 if (!s->mpeg_enc_ctx_allocated) break;
3201
3202                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3203                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3204                         break;
3205                 }
3206
3207                 if(s2->first_slice){
3208                     s2->first_slice=0;
3209                             if(mpeg_field_start(s2) < 0)
3210                         return -1;
3211                     }
3212                 if(!s2->current_picture_ptr){
3213                     av_log(avctx, AV_LOG_ERROR, "current_picture not initalized\n");
3214                     return -1;
3215                 }
3216
3217                 if(avctx->thread_count > 1){
3218                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3219                     if(threshold <= mb_y){
3220                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3221
3222                         thread_context->start_mb_y= mb_y;
3223                         thread_context->end_mb_y  = s2->mb_height;
3224                         if(s->slice_count){
3225                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3226                             ff_update_duplicate_context(thread_context, s2);
3227                         }
3228                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3229                         s->slice_count++;
3230                     }
3231                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
3232                 }else{
3233                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3234                     emms_c();
3235
3236                     if(ret < 0){
3237                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3238                             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);
3239                     }else{
3240                         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);
3241                     }
3242                 }
3243             }
3244             break;
3245         }
3246     }
3247 }
3248
3249 static int mpeg_decode_end(AVCodecContext *avctx)
3250 {
3251     Mpeg1Context *s = avctx->priv_data;
3252
3253     if (s->mpeg_enc_ctx_allocated)
3254         MPV_common_end(&s->mpeg_enc_ctx);
3255     return 0;
3256 }
3257
3258 AVCodec mpeg1video_decoder = {
3259     "mpeg1video",
3260     CODEC_TYPE_VIDEO,
3261     CODEC_ID_MPEG1VIDEO,
3262     sizeof(Mpeg1Context),
3263     mpeg_decode_init,
3264     NULL,
3265     mpeg_decode_end,
3266     mpeg_decode_frame,
3267     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3268     .flush= ff_mpeg_flush,
3269 };
3270
3271 AVCodec mpeg2video_decoder = {
3272     "mpeg2video",
3273     CODEC_TYPE_VIDEO,
3274     CODEC_ID_MPEG2VIDEO,
3275     sizeof(Mpeg1Context),
3276     mpeg_decode_init,
3277     NULL,
3278     mpeg_decode_end,
3279     mpeg_decode_frame,
3280     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3281     .flush= ff_mpeg_flush,
3282 };
3283
3284 //legacy decoder
3285 AVCodec mpegvideo_decoder = {
3286     "mpegvideo",
3287     CODEC_TYPE_VIDEO,
3288     CODEC_ID_MPEG2VIDEO,
3289     sizeof(Mpeg1Context),
3290     mpeg_decode_init,
3291     NULL,
3292     mpeg_decode_end,
3293     mpeg_decode_frame,
3294     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3295     .flush= ff_mpeg_flush,
3296 };
3297
3298 #ifdef CONFIG_ENCODERS
3299
3300 AVCodec mpeg1video_encoder = {
3301     "mpeg1video",
3302     CODEC_TYPE_VIDEO,
3303     CODEC_ID_MPEG1VIDEO,
3304     sizeof(MpegEncContext),
3305     encode_init,
3306     MPV_encode_picture,
3307     MPV_encode_end,
3308     .supported_framerates= ff_frame_rate_tab+1,
3309     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3310     .capabilities= CODEC_CAP_DELAY,
3311 };
3312
3313 AVCodec mpeg2video_encoder = {
3314     "mpeg2video",
3315     CODEC_TYPE_VIDEO,
3316     CODEC_ID_MPEG2VIDEO,
3317     sizeof(MpegEncContext),
3318     encode_init,
3319     MPV_encode_picture,
3320     MPV_encode_end,
3321     .supported_framerates= ff_frame_rate_tab+1,
3322     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3323     .capabilities= CODEC_CAP_DELAY,
3324 };
3325 #endif
3326
3327 #ifdef HAVE_XVMC
3328 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3329     Mpeg1Context *s;
3330
3331     if( avctx->thread_count > 1)
3332         return -1;
3333     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3334         return -1;
3335     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3336         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3337     }
3338     mpeg_decode_init(avctx);
3339     s = avctx->priv_data;
3340
3341     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3342     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3343
3344     return 0;
3345 }
3346
3347 AVCodec mpeg_xvmc_decoder = {
3348     "mpegvideo_xvmc",
3349     CODEC_TYPE_VIDEO,
3350     CODEC_ID_MPEG2VIDEO_XVMC,
3351     sizeof(Mpeg1Context),
3352     mpeg_mc_decode_init,
3353     NULL,
3354     mpeg_decode_end,
3355     mpeg_decode_frame,
3356     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3357     .flush= ff_mpeg_flush,
3358 };
3359
3360 #endif
3361
3362 #ifdef CONFIG_MPEGVIDEO_PARSER
3363 static void mpegvideo_extract_headers(AVCodecParserContext *s,
3364                                       AVCodecContext *avctx,
3365                                       const uint8_t *buf, int buf_size)
3366 {
3367     ParseContext1 *pc = s->priv_data;
3368     const uint8_t *buf_end;
3369     uint32_t start_code;
3370     int frame_rate_index, ext_type, bytes_left;
3371     int frame_rate_ext_n, frame_rate_ext_d;
3372     int picture_structure, top_field_first, repeat_first_field, progressive_frame;
3373     int horiz_size_ext, vert_size_ext, bit_rate_ext;
3374 //FIXME replace the crap with get_bits()
3375     s->repeat_pict = 0;
3376     buf_end = buf + buf_size;
3377     while (buf < buf_end) {
3378         start_code= -1;
3379         buf= ff_find_start_code(buf, buf_end, &start_code);
3380         bytes_left = buf_end - buf;
3381         switch(start_code) {
3382         case PICTURE_START_CODE:
3383             if (bytes_left >= 2) {
3384                 s->pict_type = (buf[1] >> 3) & 7;
3385             }
3386             break;
3387         case SEQ_START_CODE:
3388             if (bytes_left >= 7) {
3389                 pc->width  = (buf[0] << 4) | (buf[1] >> 4);
3390                 pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
3391                 avcodec_set_dimensions(avctx, pc->width, pc->height);
3392                 frame_rate_index = buf[3] & 0xf;
3393                 pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
3394                 pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
3395                 avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
3396                 avctx->codec_id = CODEC_ID_MPEG1VIDEO;
3397                 avctx->sub_id = 1;
3398             }
3399             break;
3400         case EXT_START_CODE:
3401             if (bytes_left >= 1) {
3402                 ext_type = (buf[0] >> 4);
3403                 switch(ext_type) {
3404                 case 0x1: /* sequence extension */
3405                     if (bytes_left >= 6) {
3406                         horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
3407                         vert_size_ext = (buf[2] >> 5) & 3;
3408                         bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
3409                         frame_rate_ext_n = (buf[5] >> 5) & 3;
3410                         frame_rate_ext_d = (buf[5] & 0x1f);
3411                         pc->progressive_sequence = buf[1] & (1 << 3);
3412                         avctx->has_b_frames= !(buf[5] >> 7);
3413
3414                         pc->width  |=(horiz_size_ext << 12);
3415                         pc->height |=( vert_size_ext << 12);
3416                         avctx->bit_rate += (bit_rate_ext << 18) * 400;
3417                         avcodec_set_dimensions(avctx, pc->width, pc->height);
3418                         avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
3419                         avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
3420                         avctx->codec_id = CODEC_ID_MPEG2VIDEO;
3421                         avctx->sub_id = 2; /* forces MPEG2 */
3422                     }
3423                     break;
3424                 case 0x8: /* picture coding extension */
3425                     if (bytes_left >= 5) {
3426                         picture_structure = buf[2]&3;
3427                         top_field_first = buf[3] & (1 << 7);
3428                         repeat_first_field = buf[3] & (1 << 1);
3429                         progressive_frame = buf[4] & (1 << 7);
3430
3431                         /* check if we must repeat the frame */
3432                         if (repeat_first_field) {
3433                             if (pc->progressive_sequence) {
3434                                 if (top_field_first)
3435                                     s->repeat_pict = 4;
3436                                 else
3437                                     s->repeat_pict = 2;
3438                             } else if (progressive_frame) {
3439                                 s->repeat_pict = 1;
3440                             }
3441                         }
3442
3443                         /* the packet only represents half a frame
3444                            XXX,FIXME maybe find a different solution */
3445                         if(picture_structure != 3)
3446                             s->repeat_pict = -1;
3447                     }
3448                     break;
3449                 }
3450             }
3451             break;
3452         case -1:
3453             goto the_end;
3454         default:
3455             /* we stop parsing when we encounter a slice. It ensures
3456                that this function takes a negligible amount of time */
3457             if (start_code >= SLICE_MIN_START_CODE &&
3458                 start_code <= SLICE_MAX_START_CODE)
3459                 goto the_end;
3460             break;
3461         }
3462     }
3463  the_end: ;
3464 }
3465
3466 static int mpegvideo_parse(AVCodecParserContext *s,
3467                            AVCodecContext *avctx,
3468                            uint8_t **poutbuf, int *poutbuf_size,
3469