0b7cb47e80f61be43eba6ff40a2992e55edffdfe
[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
35 //#undef NDEBUG
36 //#include <assert.h>
37
38
39 /* Start codes. */
40 #define SEQ_END_CODE            0x000001b7
41 #define SEQ_START_CODE          0x000001b3
42 #define GOP_START_CODE          0x000001b8
43 #define PICTURE_START_CODE      0x00000100
44 #define SLICE_MIN_START_CODE    0x00000101
45 #define SLICE_MAX_START_CODE    0x000001af
46 #define EXT_START_CODE          0x000001b5
47 #define USER_START_CODE         0x000001b2
48
49 #define DC_VLC_BITS 9
50 #define MV_VLC_BITS 9
51 #define MBINCR_VLC_BITS 9
52 #define MB_PAT_VLC_BITS 9
53 #define MB_PTYPE_VLC_BITS 6
54 #define MB_BTYPE_VLC_BITS 6
55 #define TEX_VLC_BITS 9
56
57 #ifdef CONFIG_ENCODERS
58 static void mpeg1_encode_block(MpegEncContext *s,
59                          DCTELEM *block,
60                          int component);
61 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
62 #endif //CONFIG_ENCODERS
63 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
64                               DCTELEM *block,
65                               int n);
66 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
67                               DCTELEM *block,
68                               int n);
69 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
70 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
71                                         DCTELEM *block,
72                                         int n);
73 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
74                                     DCTELEM *block,
75                                     int n);
76 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
77 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
78 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
79 static void exchange_uv(MpegEncContext *s);
80
81 #ifdef HAVE_XVMC
82 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
83 extern int XVMC_field_end(MpegEncContext *s);
84 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
85 extern void XVMC_init_block(MpegEncContext *s);//set s->block
86 #endif
87
88 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
89 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
90 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
91 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
92                                            PIX_FMT_XVMC_MPEG2_IDCT,
93                                            PIX_FMT_XVMC_MPEG2_MC,
94                                            -1};
95 #ifdef CONFIG_ENCODERS
96 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
97 static uint8_t fcode_tab[MAX_MV*2+1];
98
99 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
100 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
101
102 /* simple include everything table for dc, first byte is bits number next 3 are code*/
103 static uint32_t mpeg1_lum_dc_uni[512];
104 static uint32_t mpeg1_chr_dc_uni[512];
105
106 static uint8_t mpeg1_index_run[2][64];
107 static int8_t mpeg1_max_level[2][64];
108 #endif //CONFIG_ENCODERS
109
110 static void init_2d_vlc_rl(RLTable *rl, int use_static)
111 {
112     int i;
113
114     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
115              &rl->table_vlc[0][1], 4, 2,
116              &rl->table_vlc[0][0], 4, 2, use_static);
117
118     if(use_static)
119         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120     else
121         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
122
123     for(i=0; i<rl->vlc.table_size; i++){
124         int code= rl->vlc.table[i][0];
125         int len = rl->vlc.table[i][1];
126         int level, run;
127
128         if(len==0){ // illegal code
129             run= 65;
130             level= MAX_LEVEL;
131         }else if(len<0){ //more bits needed
132             run= 0;
133             level= code;
134         }else{
135             if(code==rl->n){ //esc
136                 run= 65;
137                 level= 0;
138             }else if(code==rl->n+1){ //eob
139                 run= 0;
140                 level= 127;
141             }else{
142                 run=   rl->table_run  [code] + 1;
143                 level= rl->table_level[code];
144             }
145         }
146         rl->rl_vlc[0][i].len= len;
147         rl->rl_vlc[0][i].level= level;
148         rl->rl_vlc[0][i].run= run;
149     }
150 }
151
152 #ifdef CONFIG_ENCODERS
153 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
154     int i;
155
156     for(i=0; i<128; i++){
157         int level= i-64;
158         int run;
159         for(run=0; run<64; run++){
160             int len, bits, code;
161
162             int alevel= FFABS(level);
163             int sign= (level>>31)&1;
164
165             if (alevel > rl->max_level[0][run])
166                 code= 111; /*rl->n*/
167             else
168                 code= rl->index_run[0][run] + alevel - 1;
169
170             if (code < 111 /* rl->n */) {
171                 /* store the vlc & sign at once */
172                 len=   rl->table_vlc[code][1]+1;
173                 bits= (rl->table_vlc[code][0]<<1) + sign;
174             } else {
175                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
176                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
177
178                 bits|= run;
179                 if (alevel < 128) {
180                     bits<<=8; len+=8;
181                     bits|= level & 0xff;
182                 } else {
183                     bits<<=16; len+=16;
184                     bits|= level & 0xff;
185                     if (level < 0) {
186                         bits|= 0x8001 + level + 255;
187                     } else {
188                         bits|= level & 0xffff;
189                     }
190                 }
191             }
192
193             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
194         }
195     }
196 }
197
198
199 static int find_frame_rate_index(MpegEncContext *s){
200     int i;
201     int64_t dmin= INT64_MAX;
202     int64_t d;
203
204     for(i=1;i<14;i++) {
205         int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
206         int64_t n1= 1001LL*s->avctx->time_base.den;
207         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
208
209         d = FFABS(n0 - n1);
210         if(d < dmin){
211             dmin=d;
212             s->frame_rate_index= i;
213         }
214     }
215     if(dmin)
216         return -1;
217     else
218         return 0;
219 }
220
221 static int encode_init(AVCodecContext *avctx)
222 {
223     MpegEncContext *s = avctx->priv_data;
224
225     if(MPV_encode_init(avctx) < 0)
226         return -1;
227
228     if(find_frame_rate_index(s) < 0){
229         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
230             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
231             return -1;
232         }else{
233             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);
234         }
235     }
236
237     if(avctx->profile == FF_PROFILE_UNKNOWN){
238         if(avctx->level != FF_LEVEL_UNKNOWN){
239             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
240             return -1;
241         }
242         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
243     }
244
245     if(avctx->level == FF_LEVEL_UNKNOWN){
246         if(avctx->profile == 0){ /* 4:2:2 */
247             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
248             else                                            avctx->level = 2; /* High */
249         }else{
250             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
251                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
252                 return -1;
253             }
254             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
255             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
256             else                                            avctx->level = 4; /* High */
257         }
258     }
259
260     if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
261         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
262         return -1;
263     }
264
265     return 0;
266 }
267
268 static void put_header(MpegEncContext *s, int header)
269 {
270     align_put_bits(&s->pb);
271     put_bits(&s->pb, 16, header>>16);
272     put_bits(&s->pb, 16, header&0xFFFF);
273 }
274
275 /* put sequence header if needed */
276 static void mpeg1_encode_sequence_header(MpegEncContext *s)
277 {
278         unsigned int vbv_buffer_size;
279         unsigned int fps, v;
280         int i;
281         uint64_t time_code;
282         float best_aspect_error= 1E10;
283         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
284         int constraint_parameter_flag;
285
286         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
287
288         if (s->current_picture.key_frame) {
289             AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
290
291             /* mpeg1 header repeated every gop */
292             put_header(s, SEQ_START_CODE);
293
294             put_bits(&s->pb, 12, s->width);
295             put_bits(&s->pb, 12, s->height);
296
297             for(i=1; i<15; i++){
298                 float error= aspect_ratio;
299                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
300                     error-= 1.0/mpeg1_aspect[i];
301                 else
302                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
303
304                 error= FFABS(error);
305
306                 if(error < best_aspect_error){
307                     best_aspect_error= error;
308                     s->aspect_ratio_info= i;
309                 }
310             }
311
312             put_bits(&s->pb, 4, s->aspect_ratio_info);
313             put_bits(&s->pb, 4, s->frame_rate_index);
314
315             if(s->avctx->rc_max_rate){
316                 v = (s->avctx->rc_max_rate + 399) / 400;
317                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
318                     v = 0x3ffff;
319             }else{
320                 v= 0x3FFFF;
321             }
322
323             if(s->avctx->rc_buffer_size)
324                 vbv_buffer_size = s->avctx->rc_buffer_size;
325             else
326                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
327                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
328             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
329
330             put_bits(&s->pb, 18, v & 0x3FFFF);
331             put_bits(&s->pb, 1, 1); /* marker */
332             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
333
334             constraint_parameter_flag=
335                 s->width <= 768 && s->height <= 576 &&
336                 s->mb_width * s->mb_height <= 396 &&
337                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
338                 framerate.num <= framerate.den*30 &&
339                 s->avctx->me_range && s->avctx->me_range < 128 &&
340                 vbv_buffer_size <= 20 &&
341                 v <= 1856000/400 &&
342                 s->codec_id == CODEC_ID_MPEG1VIDEO;
343
344             put_bits(&s->pb, 1, constraint_parameter_flag);
345
346             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
347             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
348
349             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
350                 put_header(s, EXT_START_CODE);
351                 put_bits(&s->pb, 4, 1); //seq ext
352
353                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
354
355                 put_bits(&s->pb, 3, s->avctx->profile); //profile
356                 put_bits(&s->pb, 4, s->avctx->level); //level
357
358                 put_bits(&s->pb, 1, s->progressive_sequence);
359                 put_bits(&s->pb, 2, s->chroma_format);
360                 put_bits(&s->pb, 2, 0); //horizontal size ext
361                 put_bits(&s->pb, 2, 0); //vertical size ext
362                 put_bits(&s->pb, 12, v>>18); //bitrate ext
363                 put_bits(&s->pb, 1, 1); //marker
364                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
365                 put_bits(&s->pb, 1, s->low_delay);
366                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
367                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
368             }
369
370             put_header(s, GOP_START_CODE);
371             put_bits(&s->pb, 1, !!(s->avctx->flags & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
372             /* time code : we must convert from the real frame rate to a
373                fake mpeg frame rate in case of low frame rate */
374             fps = (framerate.num + framerate.den/2)/ framerate.den;
375             time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
376
377             s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
378             if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
379                 /* only works for NTSC 29.97 */
380                 int d = time_code / 17982;
381                 int m = time_code % 17982;
382                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
383                 time_code += 18 * d + 2 * ((m - 2) / 1798);
384             }
385             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
386             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
387             put_bits(&s->pb, 1, 1);
388             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
389             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
390             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
391             put_bits(&s->pb, 1, 0); /* broken link */
392         }
393 }
394
395 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
396     while (run >= 33) {
397         put_bits(&s->pb, 11, 0x008);
398         run -= 33;
399     }
400     put_bits(&s->pb, mbAddrIncrTable[run][1],
401              mbAddrIncrTable[run][0]);
402 }
403 #endif //CONFIG_ENCODERS
404
405 static void common_init(MpegEncContext *s)
406 {
407
408     s->y_dc_scale_table=
409     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
410
411 }
412
413 void ff_mpeg1_clean_buffers(MpegEncContext *s){
414     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
415     s->last_dc[1] = s->last_dc[0];
416     s->last_dc[2] = s->last_dc[0];
417     memset(s->last_mv, 0, sizeof(s->last_mv));
418 }
419
420 #ifdef CONFIG_ENCODERS
421
422 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
423     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
424     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
425     put_bits(&s->pb, 1, 0); /* slice extra information */
426 }
427
428 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
429 {
430     mpeg1_encode_sequence_header(s);
431
432     /* mpeg1 picture header */
433     put_header(s, PICTURE_START_CODE);
434     /* temporal reference */
435
436     // RAL: s->picture_number instead of s->fake_picture_number
437     put_bits(&s->pb, 10, (s->picture_number -
438                           s->gop_picture_number) & 0x3ff);
439     put_bits(&s->pb, 3, s->pict_type);
440
441     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
442     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
443
444     // RAL: Forward f_code also needed for B frames
445     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
446         put_bits(&s->pb, 1, 0); /* half pel coordinates */
447         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
448             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
449         else
450             put_bits(&s->pb, 3, 7); /* forward_f_code */
451     }
452
453     // RAL: Backward f_code necessary for B frames
454     if (s->pict_type == B_TYPE) {
455         put_bits(&s->pb, 1, 0); /* half pel coordinates */
456         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
457             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
458         else
459             put_bits(&s->pb, 3, 7); /* backward_f_code */
460     }
461
462     put_bits(&s->pb, 1, 0); /* extra bit picture */
463
464     s->frame_pred_frame_dct = 1;
465     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
466         put_header(s, EXT_START_CODE);
467         put_bits(&s->pb, 4, 8); //pic ext
468         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
469             put_bits(&s->pb, 4, s->f_code);
470             put_bits(&s->pb, 4, s->f_code);
471         }else{
472             put_bits(&s->pb, 8, 255);
473         }
474         if (s->pict_type == B_TYPE) {
475             put_bits(&s->pb, 4, s->b_code);
476             put_bits(&s->pb, 4, s->b_code);
477         }else{
478             put_bits(&s->pb, 8, 255);
479         }
480         put_bits(&s->pb, 2, s->intra_dc_precision);
481
482         assert(s->picture_structure == PICT_FRAME);
483         put_bits(&s->pb, 2, s->picture_structure);
484         if (s->progressive_sequence) {
485             put_bits(&s->pb, 1, 0); /* no repeat */
486         } else {
487             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
488         }
489         /* XXX: optimize the generation of this flag with entropy
490            measures */
491         s->frame_pred_frame_dct = s->progressive_sequence;
492
493         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
494         put_bits(&s->pb, 1, s->concealment_motion_vectors);
495         put_bits(&s->pb, 1, s->q_scale_type);
496         put_bits(&s->pb, 1, s->intra_vlc_format);
497         put_bits(&s->pb, 1, s->alternate_scan);
498         put_bits(&s->pb, 1, s->repeat_first_field);
499         s->progressive_frame = s->progressive_sequence;
500         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
501         put_bits(&s->pb, 1, s->progressive_frame);
502         put_bits(&s->pb, 1, 0); //composite_display_flag
503     }
504     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
505         int i;
506
507         put_header(s, USER_START_CODE);
508         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
509             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
510         }
511     }
512
513     s->mb_y=0;
514     ff_mpeg1_encode_slice_header(s);
515 }
516
517 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
518                                 int has_mv, int field_motion)
519 {
520     put_bits(&s->pb, n, bits);
521     if (!s->frame_pred_frame_dct) {
522         if (has_mv)
523             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
524         put_bits(&s->pb, 1, s->interlaced_dct);
525     }
526 }
527
528 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
529                                                    DCTELEM block[6][64],
530                                                    int motion_x, int motion_y,
531                                                    int mb_block_count)
532 {
533     int i, cbp;
534     const int mb_x = s->mb_x;
535     const int mb_y = s->mb_y;
536     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
537
538     /* compute cbp */
539     cbp = 0;
540     for(i=0;i<mb_block_count;i++) {
541         if (s->block_last_index[i] >= 0)
542             cbp |= 1 << (mb_block_count - 1 - i);
543     }
544
545     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
546         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
547         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
548         (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) |
549         ((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))) {
550         s->mb_skip_run++;
551         s->qscale -= s->dquant;
552         s->skip_count++;
553         s->misc_bits++;
554         s->last_bits++;
555         if(s->pict_type == P_TYPE){
556             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
557             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
558         }
559     } else {
560         if(first_mb){
561             assert(s->mb_skip_run == 0);
562             encode_mb_skip_run(s, s->mb_x);
563         }else{
564             encode_mb_skip_run(s, s->mb_skip_run);
565         }
566
567         if (s->pict_type == I_TYPE) {
568             if(s->dquant && cbp){
569                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
570                 put_bits(&s->pb, 5, s->qscale);
571             }else{
572                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
573                 s->qscale -= s->dquant;
574             }
575             s->misc_bits+= get_bits_diff(s);
576             s->i_count++;
577         } else if (s->mb_intra) {
578             if(s->dquant && cbp){
579                 put_mb_modes(s, 6, 0x01, 0, 0);
580                 put_bits(&s->pb, 5, s->qscale);
581             }else{
582                 put_mb_modes(s, 5, 0x03, 0, 0);
583                 s->qscale -= s->dquant;
584             }
585             s->misc_bits+= get_bits_diff(s);
586             s->i_count++;
587             memset(s->last_mv, 0, sizeof(s->last_mv));
588         } else if (s->pict_type == P_TYPE) {
589             if(s->mv_type == MV_TYPE_16X16){
590                 if (cbp != 0) {
591                     if ((motion_x|motion_y) == 0) {
592                         if(s->dquant){
593                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
594                             put_bits(&s->pb, 5, s->qscale);
595                         }else{
596                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
597                         }
598                         s->misc_bits+= get_bits_diff(s);
599                     } else {
600                         if(s->dquant){
601                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
602                             put_bits(&s->pb, 5, s->qscale);
603                         }else{
604                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
605                         }
606                         s->misc_bits+= get_bits_diff(s);
607                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
608                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
609                         s->mv_bits+= get_bits_diff(s);
610                     }
611                 } else {
612                     put_bits(&s->pb, 3, 1); /* motion only */
613                     if (!s->frame_pred_frame_dct)
614                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
615                     s->misc_bits+= get_bits_diff(s);
616                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
617                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
618                     s->qscale -= s->dquant;
619                     s->mv_bits+= get_bits_diff(s);
620                 }
621                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
622                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
623             }else{
624                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
625
626                 if (cbp) {
627                     if(s->dquant){
628                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
629                         put_bits(&s->pb, 5, s->qscale);
630                     }else{
631                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
632                     }
633                 } else {
634                     put_bits(&s->pb, 3, 1); /* motion only */
635                     put_bits(&s->pb, 2, 1); /* motion_type: field */
636                     s->qscale -= s->dquant;
637                 }
638                 s->misc_bits+= get_bits_diff(s);
639                 for(i=0; i<2; i++){
640                     put_bits(&s->pb, 1, s->field_select[0][i]);
641                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
642                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
643                     s->last_mv[0][i][0]=   s->mv[0][i][0];
644                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
645                 }
646                 s->mv_bits+= get_bits_diff(s);
647             }
648             if(cbp) {
649                 if (s->chroma_y_shift) {
650                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
651                 } else {
652                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
653                     put_bits(&s->pb, 2, cbp & 3);
654                 }
655             }
656             s->f_count++;
657         } else{
658             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
659
660             if(s->mv_type == MV_TYPE_16X16){
661                 if (cbp){    // With coded bloc pattern
662                     if (s->dquant) {
663                         if(s->mv_dir == MV_DIR_FORWARD)
664                             put_mb_modes(s, 6, 3, 1, 0);
665                         else
666                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
667                         put_bits(&s->pb, 5, s->qscale);
668                     } else {
669                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
670                     }
671                 }else{    // No coded bloc pattern
672                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
673                     if (!s->frame_pred_frame_dct)
674                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
675                     s->qscale -= s->dquant;
676                 }
677                 s->misc_bits += get_bits_diff(s);
678                 if (s->mv_dir&MV_DIR_FORWARD){
679                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
680                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
681                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
682                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
683                     s->f_count++;
684                 }
685                 if (s->mv_dir&MV_DIR_BACKWARD){
686                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
687                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
688                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
689                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
690                     s->b_count++;
691                 }
692             }else{
693                 assert(s->mv_type == MV_TYPE_FIELD);
694                 assert(!s->frame_pred_frame_dct);
695                 if (cbp){    // With coded bloc pattern
696                     if (s->dquant) {
697                         if(s->mv_dir == MV_DIR_FORWARD)
698                             put_mb_modes(s, 6, 3, 1, 1);
699                         else
700                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
701                         put_bits(&s->pb, 5, s->qscale);
702                     } else {
703                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
704                     }
705                 }else{    // No coded bloc pattern
706                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
707                     put_bits(&s->pb, 2, 1); /* motion_type: field */
708                     s->qscale -= s->dquant;
709                 }
710                 s->misc_bits += get_bits_diff(s);
711                 if (s->mv_dir&MV_DIR_FORWARD){
712                     for(i=0; i<2; i++){
713                         put_bits(&s->pb, 1, s->field_select[0][i]);
714                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
715                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
716                         s->last_mv[0][i][0]=   s->mv[0][i][0];
717                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
718                     }
719                     s->f_count++;
720                 }
721                 if (s->mv_dir&MV_DIR_BACKWARD){
722                     for(i=0; i<2; i++){
723                         put_bits(&s->pb, 1, s->field_select[1][i]);
724                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
725                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
726                         s->last_mv[1][i][0]=   s->mv[1][i][0];
727                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
728                     }
729                     s->b_count++;
730                 }
731             }
732             s->mv_bits += get_bits_diff(s);
733             if(cbp) {
734                 if (s->chroma_y_shift) {
735                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
736                 } else {
737                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
738                     put_bits(&s->pb, 2, cbp & 3);
739                 }
740             }
741         }
742         for(i=0;i<mb_block_count;i++) {
743             if (cbp & (1 << (mb_block_count - 1 - i))) {
744                 mpeg1_encode_block(s, block[i], i);
745             }
746         }
747         s->mb_skip_run = 0;
748         if(s->mb_intra)
749             s->i_tex_bits+= get_bits_diff(s);
750         else
751             s->p_tex_bits+= get_bits_diff(s);
752     }
753 }
754
755 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
756 {
757     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
758     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
759 }
760
761 // RAL: Parameter added: f_or_b_code
762 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
763 {
764     int code, bit_size, l, bits, range, sign;
765
766     if (val == 0) {
767         /* zero vector */
768         code = 0;
769         put_bits(&s->pb,
770                  mbMotionVectorTable[0][1],
771                  mbMotionVectorTable[0][0]);
772     } else {
773         bit_size = f_or_b_code - 1;
774         range = 1 << bit_size;
775         /* modulo encoding */
776         l= INT_BIT - 5 - bit_size;
777         val= (val<<l)>>l;
778
779         if (val >= 0) {
780             val--;
781             code = (val >> bit_size) + 1;
782             bits = val & (range - 1);
783             sign = 0;
784         } else {
785             val = -val;
786             val--;
787             code = (val >> bit_size) + 1;
788             bits = val & (range - 1);
789             sign = 1;
790         }
791
792         assert(code > 0 && code <= 16);
793
794         put_bits(&s->pb,
795                  mbMotionVectorTable[code][1],
796                  mbMotionVectorTable[code][0]);
797
798         put_bits(&s->pb, 1, sign);
799         if (bit_size > 0) {
800             put_bits(&s->pb, bit_size, bits);
801         }
802     }
803 }
804
805 void ff_mpeg1_encode_init(MpegEncContext *s)
806 {
807     static int done=0;
808
809     common_init(s);
810
811     if(!done){
812         int f_code;
813         int mv;
814         int i;
815
816         done=1;
817         init_rl(&rl_mpeg1, 1);
818         if(s->intra_vlc_format)
819             init_rl(&rl_mpeg2, 1);
820
821         for(i=0; i<64; i++)
822         {
823                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
824                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
825         }
826
827         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
828         if(s->intra_vlc_format)
829             init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
830
831         /* build unified dc encoding tables */
832         for(i=-255; i<256; i++)
833         {
834                 int adiff, index;
835                 int bits, code;
836                 int diff=i;
837
838                 adiff = FFABS(diff);
839                 if(diff<0) diff--;
840                 index = av_log2(2*adiff);
841
842                 bits= vlc_dc_lum_bits[index] + index;
843                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
844                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
845
846                 bits= vlc_dc_chroma_bits[index] + index;
847                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
848                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
849         }
850
851         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
852
853         for(f_code=1; f_code<=MAX_FCODE; f_code++){
854             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
855                 int len;
856
857                 if(mv==0) len= mbMotionVectorTable[0][1];
858                 else{
859                     int val, bit_size, range, code;
860
861                     bit_size = f_code - 1;
862                     range = 1 << bit_size;
863
864                     val=mv;
865                     if (val < 0)
866                         val = -val;
867                     val--;
868                     code = (val >> bit_size) + 1;
869                     if(code<17){
870                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
871                     }else{
872                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
873                     }
874                 }
875
876                 mv_penalty[f_code][mv+MAX_MV]= len;
877             }
878         }
879
880
881         for(f_code=MAX_FCODE; f_code>0; f_code--){
882             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
883                 fcode_tab[mv+MAX_MV]= f_code;
884             }
885         }
886     }
887     s->me.mv_penalty= mv_penalty;
888     s->fcode_tab= fcode_tab;
889     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
890         s->min_qcoeff=-255;
891         s->max_qcoeff= 255;
892     }else{
893         s->min_qcoeff=-2047;
894         s->max_qcoeff= 2047;
895     }
896     if (s->intra_vlc_format) {
897         s->intra_ac_vlc_length=
898         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
899     } else {
900         s->intra_ac_vlc_length=
901         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
902     }
903     s->inter_ac_vlc_length=
904     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
905 }
906
907 static inline void encode_dc(MpegEncContext *s, int diff, int component)
908 {
909   if(((unsigned) (diff+255)) >= 511){
910         int index;
911
912         if(diff<0){
913             index= av_log2_16bit(-2*diff);
914             diff--;
915         }else{
916             index= av_log2_16bit(2*diff);
917         }
918         if (component == 0) {
919             put_bits(
920                 &s->pb,
921                 vlc_dc_lum_bits[index] + index,
922                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
923         }else{
924             put_bits(
925                 &s->pb,
926                 vlc_dc_chroma_bits[index] + index,
927                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
928         }
929   }else{
930     if (component == 0) {
931         put_bits(
932             &s->pb,
933             mpeg1_lum_dc_uni[diff+255]&0xFF,
934             mpeg1_lum_dc_uni[diff+255]>>8);
935     } else {
936         put_bits(
937             &s->pb,
938             mpeg1_chr_dc_uni[diff+255]&0xFF,
939             mpeg1_chr_dc_uni[diff+255]>>8);
940     }
941   }
942 }
943
944 static void mpeg1_encode_block(MpegEncContext *s,
945                                DCTELEM *block,
946                                int n)
947 {
948     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
949     int code, component;
950     const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
951
952     last_index = s->block_last_index[n];
953
954     /* DC coef */
955     if (s->mb_intra) {
956         component = (n <= 3 ? 0 : (n&1) + 1);
957         dc = block[0]; /* overflow is impossible */
958         diff = dc - s->last_dc[component];
959         encode_dc(s, diff, component);
960         s->last_dc[component] = dc;
961         i = 1;
962         if (s->intra_vlc_format)
963             table_vlc = rl_mpeg2.table_vlc;
964     } else {
965         /* encode the first coefficient : needs to be done here because
966            it is handled slightly differently */
967         level = block[0];
968         if (abs(level) == 1) {
969                 code = ((uint32_t)level >> 31); /* the sign bit */
970                 put_bits(&s->pb, 2, code | 0x02);
971                 i = 1;
972         } else {
973             i = 0;
974             last_non_zero = -1;
975             goto next_coef;
976         }
977     }
978
979     /* now quantify & encode AC coefs */
980     last_non_zero = i - 1;
981
982     for(;i<=last_index;i++) {
983         j = s->intra_scantable.permutated[i];
984         level = block[j];
985     next_coef:
986 #if 0
987         if (level != 0)
988             dprintf("level[%d]=%d\n", i, level);
989 #endif
990         /* encode using VLC */
991         if (level != 0) {
992             run = i - last_non_zero - 1;
993
994             alevel= level;
995             MASK_ABS(sign, alevel)
996             sign&=1;
997
998             if (alevel <= mpeg1_max_level[0][run]){
999                 code= mpeg1_index_run[0][run] + alevel - 1;
1000                 /* store the vlc & sign at once */
1001                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
1002             } else {
1003                 /* escape seems to be pretty rare <5% so i dont optimize it */
1004                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
1005                 /* escape: only clip in this case */
1006                 put_bits(&s->pb, 6, run);
1007                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
1008                     if (alevel < 128) {
1009                         put_bits(&s->pb, 8, level & 0xff);
1010                     } else {
1011                         if (level < 0) {
1012                             put_bits(&s->pb, 16, 0x8001 + level + 255);
1013                         } else {
1014                             put_bits(&s->pb, 16, level & 0xffff);
1015                         }
1016                     }
1017                 }else{
1018                     put_bits(&s->pb, 12, level & 0xfff);
1019                 }
1020             }
1021             last_non_zero = i;
1022         }
1023     }
1024     /* end of block */
1025     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
1026 }
1027 #endif //CONFIG_ENCODERS
1028
1029 /******************************************/
1030 /* decoding */
1031
1032 static VLC dc_lum_vlc;
1033 static VLC dc_chroma_vlc;
1034 static VLC mv_vlc;
1035 static VLC mbincr_vlc;
1036 static VLC mb_ptype_vlc;
1037 static VLC mb_btype_vlc;
1038 static VLC mb_pat_vlc;
1039
1040 static void init_vlcs(void)
1041 {
1042     static int done = 0;
1043
1044     if (!done) {
1045         done = 1;
1046
1047         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1048                  vlc_dc_lum_bits, 1, 1,
1049                  vlc_dc_lum_code, 2, 2, 1);
1050         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1051                  vlc_dc_chroma_bits, 1, 1,
1052                  vlc_dc_chroma_code, 2, 2, 1);
1053         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1054                  &mbMotionVectorTable[0][1], 2, 1,
1055                  &mbMotionVectorTable[0][0], 2, 1, 1);
1056         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1057                  &mbAddrIncrTable[0][1], 2, 1,
1058                  &mbAddrIncrTable[0][0], 2, 1, 1);
1059         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1060                  &mbPatTable[0][1], 2, 1,
1061                  &mbPatTable[0][0], 2, 1, 1);
1062
1063         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1064                  &table_mb_ptype[0][1], 2, 1,
1065                  &table_mb_ptype[0][0], 2, 1, 1);
1066         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1067                  &table_mb_btype[0][1], 2, 1,
1068                  &table_mb_btype[0][0], 2, 1, 1);
1069         init_rl(&rl_mpeg1, 1);
1070         init_rl(&rl_mpeg2, 1);
1071
1072         init_2d_vlc_rl(&rl_mpeg1, 1);
1073         init_2d_vlc_rl(&rl_mpeg2, 1);
1074     }
1075 }
1076
1077 static inline int get_dmv(MpegEncContext *s)
1078 {
1079     if(get_bits1(&s->gb))
1080         return 1 - (get_bits1(&s->gb) << 1);
1081     else
1082         return 0;
1083 }
1084
1085 static inline int get_qscale(MpegEncContext *s)
1086 {
1087     int qscale = get_bits(&s->gb, 5);
1088     if (s->q_scale_type) {
1089         return non_linear_qscale[qscale];
1090     } else {
1091         return qscale << 1;
1092     }
1093 }
1094
1095 /* motion type (for mpeg2) */
1096 #define MT_FIELD 1
1097 #define MT_FRAME 2
1098 #define MT_16X8  2
1099 #define MT_DMV   3
1100
1101 static int mpeg_decode_mb(MpegEncContext *s,
1102                           DCTELEM block[12][64])
1103 {
1104     int i, j, k, cbp, val, mb_type, motion_type;
1105     const int mb_block_count = 4 + (1<< s->chroma_format);
1106
1107     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1108
1109     assert(s->mb_skipped==0);
1110
1111     if (s->mb_skip_run-- != 0) {
1112         if(s->pict_type == I_TYPE){
1113             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1114             return -1;
1115         }
1116
1117         /* skip mb */
1118         s->mb_intra = 0;
1119         for(i=0;i<12;i++)
1120             s->block_last_index[i] = -1;
1121         if(s->picture_structure == PICT_FRAME)
1122             s->mv_type = MV_TYPE_16X16;
1123         else
1124             s->mv_type = MV_TYPE_FIELD;
1125         if (s->pict_type == P_TYPE) {
1126             /* if P type, zero motion vector is implied */
1127             s->mv_dir = MV_DIR_FORWARD;
1128             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1129             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1130             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1131             s->field_select[0][0]= s->picture_structure - 1;
1132             s->mb_skipped = 1;
1133             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1134         } else {
1135             int mb_type;
1136
1137             if(s->mb_x)
1138                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1139             else
1140                 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,
1141             if(IS_INTRA(mb_type))
1142                 return -1;
1143
1144             /* if B type, reuse previous vectors and directions */
1145             s->mv[0][0][0] = s->last_mv[0][0][0];
1146             s->mv[0][0][1] = s->last_mv[0][0][1];
1147             s->mv[1][0][0] = s->last_mv[1][0][0];
1148             s->mv[1][0][1] = s->last_mv[1][0][1];
1149
1150             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1151                 mb_type | MB_TYPE_SKIP;
1152 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1153
1154             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1155                 s->mb_skipped = 1;
1156         }
1157
1158         return 0;
1159     }
1160
1161     switch(s->pict_type) {
1162     default:
1163     case I_TYPE:
1164         if (get_bits1(&s->gb) == 0) {
1165             if (get_bits1(&s->gb) == 0){
1166                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1167                 return -1;
1168             }
1169             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1170         } else {
1171             mb_type = MB_TYPE_INTRA;
1172         }
1173         break;
1174     case P_TYPE:
1175         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1176         if (mb_type < 0){
1177             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1178             return -1;
1179         }
1180         mb_type = ptype2mb_type[ mb_type ];
1181         break;
1182     case B_TYPE:
1183         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1184         if (mb_type < 0){
1185             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1186             return -1;
1187         }
1188         mb_type = btype2mb_type[ mb_type ];
1189         break;
1190     }
1191     dprintf("mb_type=%x\n", mb_type);
1192 //    motion_type = 0; /* avoid warning */
1193     if (IS_INTRA(mb_type)) {
1194         s->dsp.clear_blocks(s->block[0]);
1195
1196         if(!s->chroma_y_shift){
1197             s->dsp.clear_blocks(s->block[6]);
1198         }
1199
1200         /* compute dct type */
1201         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1202             !s->frame_pred_frame_dct) {
1203             s->interlaced_dct = get_bits1(&s->gb);
1204         }
1205
1206         if (IS_QUANT(mb_type))
1207             s->qscale = get_qscale(s);
1208
1209         if (s->concealment_motion_vectors) {
1210             /* just parse them */
1211             if (s->picture_structure != PICT_FRAME)
1212                 skip_bits1(&s->gb); /* field select */
1213
1214             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1215                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1216             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1217                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1218
1219             skip_bits1(&s->gb); /* marker */
1220         }else
1221             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1222         s->mb_intra = 1;
1223 #ifdef HAVE_XVMC
1224         //one 1 we memcpy blocks in xvmcvideo
1225         if(s->avctx->xvmc_acceleration > 1){
1226             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1227             if(s->swap_uv){
1228                 exchange_uv(s);
1229             }
1230         }
1231 #endif
1232
1233         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1234             if(s->flags2 & CODEC_FLAG2_FAST){
1235                 for(i=0;i<6;i++) {
1236                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1237                 }
1238             }else{
1239                 for(i=0;i<mb_block_count;i++) {
1240                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1241                         return -1;
1242                 }
1243             }
1244         } else {
1245             for(i=0;i<6;i++) {
1246                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1247                     return -1;
1248             }
1249         }
1250     } else {
1251         if (mb_type & MB_TYPE_ZERO_MV){
1252             assert(mb_type & MB_TYPE_CBP);
1253
1254             /* compute dct type */
1255             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1256                 !s->frame_pred_frame_dct) {
1257                 s->interlaced_dct = get_bits1(&s->gb);
1258             }
1259
1260             if (IS_QUANT(mb_type))
1261                 s->qscale = get_qscale(s);
1262
1263             s->mv_dir = MV_DIR_FORWARD;
1264             if(s->picture_structure == PICT_FRAME)
1265                 s->mv_type = MV_TYPE_16X16;
1266             else{
1267                 s->mv_type = MV_TYPE_FIELD;
1268                 mb_type |= MB_TYPE_INTERLACED;
1269                 s->field_select[0][0]= s->picture_structure - 1;
1270             }
1271             s->last_mv[0][0][0] = 0;
1272             s->last_mv[0][0][1] = 0;
1273             s->last_mv[0][1][0] = 0;
1274             s->last_mv[0][1][1] = 0;
1275             s->mv[0][0][0] = 0;
1276             s->mv[0][0][1] = 0;
1277         }else{
1278             assert(mb_type & MB_TYPE_L0L1);
1279 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1280             /* get additionnal motion vector type */
1281             if (s->frame_pred_frame_dct)
1282                 motion_type = MT_FRAME;
1283             else{
1284                 motion_type = get_bits(&s->gb, 2);
1285             }
1286
1287             /* compute dct type */
1288             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1289                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1290                 s->interlaced_dct = get_bits1(&s->gb);
1291             }
1292
1293             if (IS_QUANT(mb_type))
1294                 s->qscale = get_qscale(s);
1295
1296             /* motion vectors */
1297             s->mv_dir = 0;
1298             for(i=0;i<2;i++) {
1299                 if (USES_LIST(mb_type, i)) {
1300                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1301                     dprintf("motion_type=%d\n", motion_type);
1302                     switch(motion_type) {
1303                     case MT_FRAME: /* or MT_16X8 */
1304                         if (s->picture_structure == PICT_FRAME) {
1305                             /* MT_FRAME */
1306                             mb_type |= MB_TYPE_16x16;
1307                             s->mv_type = MV_TYPE_16X16;
1308                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1309                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1310                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1311                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1312                             /* full_pel: only for mpeg1 */
1313                             if (s->full_pel[i]){
1314                                 s->mv[i][0][0] <<= 1;
1315                                 s->mv[i][0][1] <<= 1;
1316                             }
1317                         } else {
1318                             /* MT_16X8 */
1319                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1320                             s->mv_type = MV_TYPE_16X8;
1321                             for(j=0;j<2;j++) {
1322                                 s->field_select[i][j] = get_bits1(&s->gb);
1323                                 for(k=0;k<2;k++) {
1324                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1325                                                              s->last_mv[i][j][k]);
1326                                     s->last_mv[i][j][k] = val;
1327                                     s->mv[i][j][k] = val;
1328                                 }
1329                             }
1330                         }
1331                         break;
1332                     case MT_FIELD:
1333                         s->mv_type = MV_TYPE_FIELD;
1334                         if (s->picture_structure == PICT_FRAME) {
1335                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1336                             for(j=0;j<2;j++) {
1337                                 s->field_select[i][j] = get_bits1(&s->gb);
1338                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1339                                                          s->last_mv[i][j][0]);
1340                                 s->last_mv[i][j][0] = val;
1341                                 s->mv[i][j][0] = val;
1342                                 dprintf("fmx=%d\n", val);
1343                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1344                                                          s->last_mv[i][j][1] >> 1);
1345                                 s->last_mv[i][j][1] = val << 1;
1346                                 s->mv[i][j][1] = val;
1347                                 dprintf("fmy=%d\n", val);
1348                             }
1349                         } else {
1350                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1351                             s->field_select[i][0] = get_bits1(&s->gb);
1352                             for(k=0;k<2;k++) {
1353                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1354                                                          s->last_mv[i][0][k]);
1355                                 s->last_mv[i][0][k] = val;
1356                                 s->last_mv[i][1][k] = val;
1357                                 s->mv[i][0][k] = val;
1358                             }
1359                         }
1360                         break;
1361                     case MT_DMV:
1362                         {
1363                             int dmx, dmy, mx, my, m;
1364
1365                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1366                                                     s->last_mv[i][0][0]);
1367                             s->last_mv[i][0][0] = mx;
1368                             s->last_mv[i][1][0] = mx;
1369                             dmx = get_dmv(s);
1370                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1371                                                     s->last_mv[i][0][1] >> 1);
1372                             dmy = get_dmv(s);
1373                             s->mv_type = MV_TYPE_DMV;
1374
1375
1376                             s->last_mv[i][0][1] = my<<1;
1377                             s->last_mv[i][1][1] = my<<1;
1378
1379                             s->mv[i][0][0] = mx;
1380                             s->mv[i][0][1] = my;
1381                             s->mv[i][1][0] = mx;//not used
1382                             s->mv[i][1][1] = my;//not used
1383
1384                             if (s->picture_structure == PICT_FRAME) {
1385                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1386
1387                                 //m = 1 + 2 * s->top_field_first;
1388                                 m = s->top_field_first ? 1 : 3;
1389
1390                                 /* top -> top pred */
1391                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1392                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1393                                 m = 4 - m;
1394                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1395                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1396                             } else {
1397                                 mb_type |= MB_TYPE_16x16;
1398
1399                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1400                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1401                                 if(s->picture_structure == PICT_TOP_FIELD)
1402                                     s->mv[i][2][1]--;
1403                                 else
1404                                     s->mv[i][2][1]++;
1405                             }
1406                         }
1407                         break;
1408                     default:
1409                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1410                         return -1;
1411                     }
1412                 }
1413             }
1414         }
1415
1416         s->mb_intra = 0;
1417         if (HAS_CBP(mb_type)) {
1418             s->dsp.clear_blocks(s->block[0]);
1419
1420             if(!s->chroma_y_shift){
1421                 s->dsp.clear_blocks(s->block[6]);
1422             }
1423
1424             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1425             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1426                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1427                 return -1;
1428             }
1429             if(mb_block_count > 6){
1430                  cbp<<= mb_block_count-6;
1431                  cbp |= get_bits(&s->gb, mb_block_count-6);
1432             }
1433
1434 #ifdef HAVE_XVMC
1435             //on 1 we memcpy blocks in xvmcvideo
1436             if(s->avctx->xvmc_acceleration > 1){
1437                 XVMC_pack_pblocks(s,cbp);
1438                 if(s->swap_uv){
1439                     exchange_uv(s);
1440                 }
1441             }
1442 #endif
1443
1444             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1445                 if(s->flags2 & CODEC_FLAG2_FAST){
1446                     for(i=0;i<6;i++) {
1447                         if(cbp & 32) {
1448                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1449                         } else {
1450                             s->block_last_index[i] = -1;
1451                         }
1452                         cbp+=cbp;
1453                     }
1454                 }else{
1455                     cbp<<= 12-mb_block_count;
1456
1457                     for(i=0;i<mb_block_count;i++) {
1458                         if ( cbp & (1<<11) ) {
1459                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1460                                 return -1;
1461                         } else {
1462                             s->block_last_index[i] = -1;
1463                         }
1464                         cbp+=cbp;
1465                     }
1466                 }
1467             } else {
1468                 if(s->flags2 & CODEC_FLAG2_FAST){
1469                     for(i=0;i<6;i++) {
1470                         if (cbp & 32) {
1471                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1472                         } else {
1473                             s->block_last_index[i] = -1;
1474                         }
1475                         cbp+=cbp;
1476                     }
1477                 }else{
1478                     for(i=0;i<6;i++) {
1479                         if (cbp & 32) {
1480                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1481                                 return -1;
1482                         } else {
1483                             s->block_last_index[i] = -1;
1484                         }
1485                         cbp+=cbp;
1486                     }
1487                 }
1488             }
1489         }else{
1490             for(i=0;i<12;i++)
1491                 s->block_last_index[i] = -1;
1492         }
1493     }
1494
1495     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1496
1497     return 0;
1498 }
1499
1500 /* as h263, but only 17 codes */
1501 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1502 {
1503     int code, sign, val, l, shift;
1504
1505     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1506     if (code == 0) {
1507         return pred;
1508     }
1509     if (code < 0) {
1510         return 0xffff;
1511     }
1512
1513     sign = get_bits1(&s->gb);
1514     shift = fcode - 1;
1515     val = code;
1516     if (shift) {
1517         val = (val - 1) << shift;
1518         val |= get_bits(&s->gb, shift);
1519         val++;
1520     }
1521     if (sign)
1522         val = -val;
1523     val += pred;
1524
1525     /* modulo decoding */
1526     l= INT_BIT - 5 - shift;
1527     val = (val<<l)>>l;
1528     return val;
1529 }
1530
1531 static inline int decode_dc(GetBitContext *gb, int component)
1532 {
1533     int code, diff;
1534
1535     if (component == 0) {
1536         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1537     } else {
1538         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1539     }
1540     if (code < 0){
1541         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1542         return 0xffff;
1543     }
1544     if (code == 0) {
1545         diff = 0;
1546     } else {
1547         diff = get_xbits(gb, code);
1548     }
1549     return diff;
1550 }
1551
1552 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1553                                DCTELEM *block,
1554                                int n)
1555 {
1556     int level, dc, diff, i, j, run;
1557     int component;
1558     RLTable *rl = &rl_mpeg1;
1559     uint8_t * const scantable= s->intra_scantable.permutated;
1560     const uint16_t *quant_matrix= s->intra_matrix;
1561     const int qscale= s->qscale;
1562
1563     /* DC coef */
1564     component = (n <= 3 ? 0 : n - 4 + 1);
1565     diff = decode_dc(&s->gb, component);
1566     if (diff >= 0xffff)
1567         return -1;
1568     dc = s->last_dc[component];
1569     dc += diff;
1570     s->last_dc[component] = dc;
1571     block[0] = dc<<3;
1572     dprintf("dc=%d diff=%d\n", dc, diff);
1573     i = 0;
1574     {
1575         OPEN_READER(re, &s->gb);
1576         /* now quantify & encode AC coefs */
1577         for(;;) {
1578             UPDATE_CACHE(re, &s->gb);
1579             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1580
1581             if(level == 127){
1582                 break;
1583             } else if(level != 0) {
1584                 i += run;
1585                 j = scantable[i];
1586                 level= (level*qscale*quant_matrix[j])>>4;
1587                 level= (level-1)|1;
1588                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1589                 LAST_SKIP_BITS(re, &s->gb, 1);
1590             } else {
1591                 /* escape */
1592                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1593                 UPDATE_CACHE(re, &s->gb);
1594                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1595                 if (level == -128) {
1596                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1597                 } else if (level == 0) {
1598                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1599                 }
1600                 i += run;
1601                 j = scantable[i];
1602                 if(level<0){
1603                     level= -level;
1604                     level= (level*qscale*quant_matrix[j])>>4;
1605                     level= (level-1)|1;
1606                     level= -level;
1607                 }else{
1608                     level= (level*qscale*quant_matrix[j])>>4;
1609                     level= (level-1)|1;
1610                 }
1611             }
1612             if (i > 63){
1613                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1614                 return -1;
1615             }
1616
1617             block[j] = level;
1618         }
1619         CLOSE_READER(re, &s->gb);
1620     }
1621     s->block_last_index[n] = i;
1622    return 0;
1623 }
1624
1625 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1626                                DCTELEM *block,
1627                                int n)
1628 {
1629     int level, i, j, run;
1630     RLTable *rl = &rl_mpeg1;
1631     uint8_t * const scantable= s->intra_scantable.permutated;
1632     const uint16_t *quant_matrix= s->inter_matrix;
1633     const int qscale= s->qscale;
1634
1635     {
1636         OPEN_READER(re, &s->gb);
1637         i = -1;
1638         /* special case for the first coef. no need to add a second vlc table */
1639         UPDATE_CACHE(re, &s->gb);
1640         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1641             level= (3*qscale*quant_matrix[0])>>5;
1642             level= (level-1)|1;
1643             if(GET_CACHE(re, &s->gb)&0x40000000)
1644                 level= -level;
1645             block[0] = level;
1646             i++;
1647             SKIP_BITS(re, &s->gb, 2);
1648             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1649                 goto end;
1650         }
1651
1652         /* now quantify & encode AC coefs */
1653         for(;;) {
1654             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1655
1656             if(level != 0) {
1657                 i += run;
1658                 j = scantable[i];
1659                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1660                 level= (level-1)|1;
1661                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1662                 SKIP_BITS(re, &s->gb, 1);
1663             } else {
1664                 /* escape */
1665                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1666                 UPDATE_CACHE(re, &s->gb);
1667                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1668                 if (level == -128) {
1669                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1670                 } else if (level == 0) {
1671                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1672                 }
1673                 i += run;
1674                 j = scantable[i];
1675                 if(level<0){
1676                     level= -level;
1677                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1678                     level= (level-1)|1;
1679                     level= -level;
1680                 }else{
1681                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1682                     level= (level-1)|1;
1683                 }
1684             }
1685             if (i > 63){
1686                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1687                 return -1;
1688             }
1689
1690             block[j] = level;
1691             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1692                 break;
1693             UPDATE_CACHE(re, &s->gb);
1694         }
1695 end:
1696         LAST_SKIP_BITS(re, &s->gb, 2);
1697         CLOSE_READER(re, &s->gb);
1698     }
1699     s->block_last_index[n] = i;
1700     return 0;
1701 }
1702
1703 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1704 {
1705     int level, i, j, run;
1706     RLTable *rl = &rl_mpeg1;
1707     uint8_t * const scantable= s->intra_scantable.permutated;
1708     const int qscale= s->qscale;
1709
1710     {
1711         OPEN_READER(re, &s->gb);
1712         i = -1;
1713         /* special case for the first coef. no need to add a second vlc table */
1714         UPDATE_CACHE(re, &s->gb);
1715         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1716             level= (3*qscale)>>1;
1717             level= (level-1)|1;
1718             if(GET_CACHE(re, &s->gb)&0x40000000)
1719                 level= -level;
1720             block[0] = level;
1721             i++;
1722             SKIP_BITS(re, &s->gb, 2);
1723             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1724                 goto end;
1725         }
1726
1727         /* now quantify & encode AC coefs */
1728         for(;;) {
1729             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1730
1731             if(level != 0) {
1732                 i += run;
1733                 j = scantable[i];
1734                 level= ((level*2+1)*qscale)>>1;
1735                 level= (level-1)|1;
1736                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1737                 SKIP_BITS(re, &s->gb, 1);
1738             } else {
1739                 /* escape */
1740                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1741                 UPDATE_CACHE(re, &s->gb);
1742                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1743                 if (level == -128) {
1744                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1745                 } else if (level == 0) {
1746                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1747                 }
1748                 i += run;
1749                 j = scantable[i];
1750                 if(level<0){
1751                     level= -level;
1752                     level= ((level*2+1)*qscale)>>1;
1753                     level= (level-1)|1;
1754                     level= -level;
1755                 }else{
1756                     level= ((level*2+1)*qscale)>>1;
1757                     level= (level-1)|1;
1758                 }
1759             }
1760
1761             block[j] = level;
1762             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1763                 break;
1764             UPDATE_CACHE(re, &s->gb);
1765         }
1766 end:
1767         LAST_SKIP_BITS(re, &s->gb, 2);
1768         CLOSE_READER(re, &s->gb);
1769     }
1770     s->block_last_index[n] = i;
1771     return 0;
1772 }
1773
1774
1775 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1776                                DCTELEM *block,
1777                                int n)
1778 {
1779     int level, i, j, run;
1780     RLTable *rl = &rl_mpeg1;
1781     uint8_t * const scantable= s->intra_scantable.permutated;
1782     const uint16_t *quant_matrix;
1783     const int qscale= s->qscale;
1784     int mismatch;
1785
1786     mismatch = 1;
1787
1788     {
1789         OPEN_READER(re, &s->gb);
1790         i = -1;
1791         if (n < 4)
1792             quant_matrix = s->inter_matrix;
1793         else
1794             quant_matrix = s->chroma_inter_matrix;
1795
1796         /* special case for the first coef. no need to add a second vlc table */
1797         UPDATE_CACHE(re, &s->gb);
1798         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1799             level= (3*qscale*quant_matrix[0])>>5;
1800             if(GET_CACHE(re, &s->gb)&0x40000000)
1801                 level= -level;
1802             block[0] = level;
1803             mismatch ^= level;
1804             i++;
1805             SKIP_BITS(re, &s->gb, 2);
1806             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1807                 goto end;
1808         }
1809
1810         /* now quantify & encode AC coefs */
1811         for(;;) {
1812             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1813
1814             if(level != 0) {
1815                 i += run;
1816                 j = scantable[i];
1817                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1818                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1819                 SKIP_BITS(re, &s->gb, 1);
1820             } else {
1821                 /* escape */
1822                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1823                 UPDATE_CACHE(re, &s->gb);
1824                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1825
1826                 i += run;
1827                 j = scantable[i];
1828                 if(level<0){
1829                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1830                     level= -level;
1831                 }else{
1832                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1833                 }
1834             }
1835             if (i > 63){
1836                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1837                 return -1;
1838             }
1839
1840             mismatch ^= level;
1841             block[j] = level;
1842             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1843                 break;
1844             UPDATE_CACHE(re, &s->gb);
1845         }
1846 end:
1847         LAST_SKIP_BITS(re, &s->gb, 2);
1848         CLOSE_READER(re, &s->gb);
1849     }
1850     block[63] ^= (mismatch & 1);
1851
1852     s->block_last_index[n] = i;
1853     return 0;
1854 }
1855
1856 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1857                                DCTELEM *block,
1858                                int n)
1859 {
1860     int level, i, j, run;
1861     RLTable *rl = &rl_mpeg1;
1862     uint8_t * const scantable= s->intra_scantable.permutated;
1863     const int qscale= s->qscale;
1864     OPEN_READER(re, &s->gb);
1865     i = -1;
1866
1867     /* special case for the first coef. no need to add a second vlc table */
1868     UPDATE_CACHE(re, &s->gb);
1869     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1870         level= (3*qscale)>>1;
1871         if(GET_CACHE(re, &s->gb)&0x40000000)
1872             level= -level;
1873         block[0] = level;
1874         i++;
1875         SKIP_BITS(re, &s->gb, 2);
1876         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1877             goto end;
1878     }
1879
1880     /* now quantify & encode AC coefs */
1881     for(;;) {
1882         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1883
1884         if(level != 0) {
1885             i += run;
1886             j = scantable[i];
1887             level= ((level*2+1)*qscale)>>1;
1888             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1889             SKIP_BITS(re, &s->gb, 1);
1890         } else {
1891             /* escape */
1892             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1893             UPDATE_CACHE(re, &s->gb);
1894             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1895
1896             i += run;
1897             j = scantable[i];
1898             if(level<0){
1899                 level= ((-level*2+1)*qscale)>>1;
1900                 level= -level;
1901             }else{
1902                 level= ((level*2+1)*qscale)>>1;
1903             }
1904         }
1905
1906         block[j] = level;
1907         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1908             break;
1909         UPDATE_CACHE(re, &s->gb);
1910     }
1911 end:
1912     LAST_SKIP_BITS(re, &s->gb, 2);
1913     CLOSE_READER(re, &s->gb);
1914     s->block_last_index[n] = i;
1915     return 0;
1916 }
1917
1918
1919 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1920                                DCTELEM *block,
1921                                int n)
1922 {
1923     int level, dc, diff, i, j, run;
1924     int component;
1925     RLTable *rl;
1926     uint8_t * const scantable= s->intra_scantable.permutated;
1927     const uint16_t *quant_matrix;
1928     const int qscale= s->qscale;
1929     int mismatch;
1930
1931     /* DC coef */
1932     if (n < 4){
1933         quant_matrix = s->intra_matrix;
1934         component = 0;
1935     }else{
1936         quant_matrix = s->chroma_intra_matrix;
1937         component = (n&1) + 1;
1938     }
1939     diff = decode_dc(&s->gb, component);
1940     if (diff >= 0xffff)
1941         return -1;
1942     dc = s->last_dc[component];
1943     dc += diff;
1944     s->last_dc[component] = dc;
1945     block[0] = dc << (3 - s->intra_dc_precision);
1946     dprintf("dc=%d\n", block[0]);
1947     mismatch = block[0] ^ 1;
1948     i = 0;
1949     if (s->intra_vlc_format)
1950         rl = &rl_mpeg2;
1951     else
1952         rl = &rl_mpeg1;
1953
1954     {
1955         OPEN_READER(re, &s->gb);
1956         /* now quantify & encode AC coefs */
1957         for(;;) {
1958             UPDATE_CACHE(re, &s->gb);
1959             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1960
1961             if(level == 127){
1962                 break;
1963             } else if(level != 0) {
1964                 i += run;
1965                 j = scantable[i];
1966                 level= (level*qscale*quant_matrix[j])>>4;
1967                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1968                 LAST_SKIP_BITS(re, &s->gb, 1);
1969             } else {
1970                 /* escape */
1971                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1972                 UPDATE_CACHE(re, &s->gb);
1973                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1974                 i += run;
1975                 j = scantable[i];
1976                 if(level<0){
1977                     level= (-level*qscale*quant_matrix[j])>>4;
1978                     level= -level;
1979                 }else{
1980                     level= (level*qscale*quant_matrix[j])>>4;
1981                 }
1982             }
1983             if (i > 63){
1984                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1985                 return -1;
1986             }
1987
1988             mismatch^= level;
1989             block[j] = level;
1990         }
1991         CLOSE_READER(re, &s->gb);
1992     }
1993     block[63]^= mismatch&1;
1994
1995     s->block_last_index[n] = i;
1996     return 0;
1997 }
1998
1999 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
2000                                DCTELEM *block,
2001                                int n)
2002 {
2003     int level, dc, diff, j, run;
2004     int component;
2005     RLTable *rl;
2006     uint8_t * scantable= s->intra_scantable.permutated;
2007     const uint16_t *quant_matrix;
2008     const int qscale= s->qscale;
2009
2010     /* DC coef */
2011     if (n < 4){
2012         quant_matrix = s->intra_matrix;
2013         component = 0;
2014     }else{
2015         quant_matrix = s->chroma_intra_matrix;
2016         component = (n&1) + 1;
2017     }
2018     diff = decode_dc(&s->gb, component);
2019     if (diff >= 0xffff)
2020         return -1;
2021     dc = s->last_dc[component];
2022     dc += diff;
2023     s->last_dc[component] = dc;
2024     block[0] = dc << (3 - s->intra_dc_precision);
2025     if (s->intra_vlc_format)
2026         rl = &rl_mpeg2;
2027     else
2028         rl = &rl_mpeg1;
2029
2030     {
2031         OPEN_READER(re, &s->gb);
2032         /* now quantify & encode AC coefs */
2033         for(;;) {
2034             UPDATE_CACHE(re, &s->gb);
2035             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2036
2037             if(level == 127){
2038                 break;
2039             } else if(level != 0) {
2040                 scantable += run;
2041                 j = *scantable;
2042                 level= (level*qscale*quant_matrix[j])>>4;
2043                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2044                 LAST_SKIP_BITS(re, &s->gb, 1);
2045             } else {
2046                 /* escape */
2047                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2048                 UPDATE_CACHE(re, &s->gb);
2049                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2050                 scantable += run;
2051                 j = *scantable;
2052                 if(level<0){
2053                     level= (-level*qscale*quant_matrix[j])>>4;
2054                     level= -level;
2055                 }else{
2056                     level= (level*qscale*quant_matrix[j])>>4;
2057                 }
2058             }
2059
2060             block[j] = level;
2061         }
2062         CLOSE_READER(re, &s->gb);
2063     }
2064
2065     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2066     return 0;
2067 }
2068
2069 typedef struct Mpeg1Context {
2070     MpegEncContext mpeg_enc_ctx;
2071     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2072     int repeat_field; /* true if we must repeat the field */
2073     AVPanScan pan_scan; /** some temporary storage for the panscan */
2074     int slice_count;
2075     int swap_uv;//indicate VCR2
2076     int save_aspect_info;
2077     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2078
2079 } Mpeg1Context;
2080
2081 static int mpeg_decode_init(AVCodecContext *avctx)
2082 {
2083     Mpeg1Context *s = avctx->priv_data;
2084     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2085     int i;
2086
2087     //we need some parmutation to store
2088     //matrixes, until MPV_common_init()
2089     //set the real permutatuon
2090     for(i=0;i<64;i++)
2091        s2->dsp.idct_permutation[i]=i;
2092
2093     MPV_decode_defaults(s2);
2094
2095     s->mpeg_enc_ctx.avctx= avctx;
2096     s->mpeg_enc_ctx.flags= avctx->flags;
2097     s->mpeg_enc_ctx.flags2= avctx->flags2;
2098     common_init(&s->mpeg_enc_ctx);
2099     init_vlcs();
2100
2101     s->mpeg_enc_ctx_allocated = 0;
2102     s->mpeg_enc_ctx.picture_number = 0;
2103     s->repeat_field = 0;
2104     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2105     return 0;
2106 }
2107
2108 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2109                                      const uint8_t *new_perm){
2110     uint16_t temp_matrix[64];
2111     int i;
2112
2113     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2114
2115     for(i=0;i<64;i++){
2116         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2117     }
2118 }
2119
2120 //Call this function when we know all parameters
2121 //it may be called in different places for mpeg1 and mpeg2
2122 static int mpeg_decode_postinit(AVCodecContext *avctx){
2123     Mpeg1Context *s1 = avctx->priv_data;
2124     MpegEncContext *s = &s1->mpeg_enc_ctx;
2125     uint8_t old_permutation[64];
2126
2127     if (
2128         (s1->mpeg_enc_ctx_allocated == 0)||
2129         avctx->coded_width  != s->width ||
2130         avctx->coded_height != s->height||
2131         s1->save_aspect_info != s->aspect_ratio_info||
2132         0)
2133     {
2134
2135         if (s1->mpeg_enc_ctx_allocated) {
2136             ParseContext pc= s->parse_context;
2137             s->parse_context.buffer=0;
2138             MPV_common_end(s);
2139             s->parse_context= pc;
2140         }
2141
2142         if( (s->width == 0 )||(s->height == 0))
2143             return -2;
2144
2145         avcodec_set_dimensions(avctx, s->width, s->height);
2146         avctx->bit_rate = s->bit_rate;
2147         s1->save_aspect_info = s->aspect_ratio_info;
2148
2149      //low_delay may be forced, in this case we will have B frames
2150      //that behave like P frames
2151         avctx->has_b_frames = !(s->low_delay);
2152
2153         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2154             //mpeg1 fps
2155             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2156             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2157             //mpeg1 aspect
2158             avctx->sample_aspect_ratio= av_d2q(
2159                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2160
2161         }else{//mpeg2
2162         //mpeg2 fps
2163             av_reduce(
2164                 &s->avctx->time_base.den,
2165                 &s->avctx->time_base.num,
2166                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2167                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2168                 1<<30);
2169         //mpeg2 aspect
2170             if(s->aspect_ratio_info > 1){
2171                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2172                     s->avctx->sample_aspect_ratio=
2173                         av_div_q(
2174                          mpeg2_aspect[s->aspect_ratio_info],
2175                          (AVRational){s->width, s->height}
2176                          );
2177                 }else{
2178                     s->avctx->sample_aspect_ratio=
2179                         av_div_q(
2180                          mpeg2_aspect[s->aspect_ratio_info],
2181                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2182                         );
2183                 }
2184             }else{
2185                 s->avctx->sample_aspect_ratio=
2186                     mpeg2_aspect[s->aspect_ratio_info];
2187             }
2188         }//mpeg2
2189
2190         if(avctx->xvmc_acceleration){
2191             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2192         }else{
2193             if(s->chroma_format <  2){
2194                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2195             }else
2196             if(s->chroma_format == 2){
2197                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2198             }else
2199             if(s->chroma_format >  2){
2200                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2201             }
2202         }
2203         //until then pix_fmt may be changed right after codec init
2204         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2205             if( avctx->idct_algo == FF_IDCT_AUTO )
2206                 avctx->idct_algo = FF_IDCT_SIMPLE;
2207
2208         //quantization matrixes may need reordering
2209         //if dct permutation is changed
2210         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2211
2212         if (MPV_common_init(s) < 0)
2213             return -2;
2214
2215         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2216         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2217         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2218         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2219
2220         s1->mpeg_enc_ctx_allocated = 1;
2221     }
2222     return 0;
2223 }
2224
2225 static int mpeg1_decode_picture(AVCodecContext *avctx,
2226                                 const uint8_t *buf, int buf_size)
2227 {
2228     Mpeg1Context *s1 = avctx->priv_data;
2229     MpegEncContext *s = &s1->mpeg_enc_ctx;
2230     int ref, f_code, vbv_delay;
2231
2232     if(mpeg_decode_postinit(s->avctx) < 0)
2233        return -2;
2234
2235     init_get_bits(&s->gb, buf, buf_size*8);
2236
2237     ref = get_bits(&s->gb, 10); /* temporal ref */
2238     s->pict_type = get_bits(&s->gb, 3);
2239     if(s->pict_type == 0 || s->pict_type > 3)
2240         return -1;
2241
2242     vbv_delay= get_bits(&s->gb, 16);
2243     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2244         s->full_pel[0] = get_bits1(&s->gb);
2245         f_code = get_bits(&s->gb, 3);
2246         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2247             return -1;
2248         s->mpeg_f_code[0][0] = f_code;
2249         s->mpeg_f_code[0][1] = f_code;
2250     }
2251     if (s->pict_type == B_TYPE) {
2252         s->full_pel[1] = get_bits1(&s->gb);
2253         f_code = get_bits(&s->gb, 3);
2254         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2255             return -1;
2256         s->mpeg_f_code[1][0] = f_code;
2257         s->mpeg_f_code[1][1] = f_code;
2258     }
2259     s->current_picture.pict_type= s->pict_type;
2260     s->current_picture.key_frame= s->pict_type == I_TYPE;
2261
2262     if(avctx->debug & FF_DEBUG_PICT_INFO)
2263         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2264
2265     s->y_dc_scale = 8;
2266     s->c_dc_scale = 8;
2267     s->first_slice = 1;
2268     return 0;
2269 }
2270
2271 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2272 {
2273     MpegEncContext *s= &s1->mpeg_enc_ctx;
2274     int horiz_size_ext, vert_size_ext;
2275     int bit_rate_ext;
2276
2277     skip_bits(&s->gb, 1); /* profil and level esc*/
2278     s->avctx->profile= get_bits(&s->gb, 3);
2279     s->avctx->level= get_bits(&s->gb, 4);
2280     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2281     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2282     horiz_size_ext = get_bits(&s->gb, 2);
2283     vert_size_ext = get_bits(&s->gb, 2);
2284     s->width |= (horiz_size_ext << 12);
2285     s->height |= (vert_size_ext << 12);
2286     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2287     s->bit_rate += (bit_rate_ext << 18) * 400;
2288     skip_bits1(&s->gb); /* marker */
2289     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2290
2291     s->low_delay = get_bits1(&s->gb);
2292     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2293
2294     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2295     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2296
2297     dprintf("sequence extension\n");
2298     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2299     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2300
2301     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2302         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2303                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2304
2305 }
2306
2307 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2308 {
2309     MpegEncContext *s= &s1->mpeg_enc_ctx;
2310     int color_description, w, h;
2311
2312     skip_bits(&s->gb, 3); /* video format */
2313     color_description= get_bits1(&s->gb);
2314     if(color_description){
2315         skip_bits(&s->gb, 8); /* color primaries */
2316         skip_bits(&s->gb, 8); /* transfer_characteristics */
2317         skip_bits(&s->gb, 8); /* matrix_coefficients */
2318     }
2319     w= get_bits(&s->gb, 14);
2320     skip_bits(&s->gb, 1); //marker
2321     h= get_bits(&s->gb, 14);
2322     skip_bits(&s->gb, 1); //marker
2323
2324     s1->pan_scan.width= 16*w;
2325     s1->pan_scan.height=16*h;
2326
2327     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2328         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2329 }
2330
2331 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2332 {
2333     MpegEncContext *s= &s1->mpeg_enc_ctx;
2334     int i,nofco;
2335
2336     nofco = 1;
2337     if(s->progressive_sequence){
2338         if(s->repeat_first_field){
2339             nofco++;
2340             if(s->top_field_first)
2341                 nofco++;
2342         }
2343     }else{
2344         if(s->picture_structure == PICT_FRAME){
2345             nofco++;
2346             if(s->repeat_first_field)
2347                 nofco++;
2348         }
2349     }
2350     for(i=0; i<nofco; i++){
2351         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2352         skip_bits(&s->gb, 1); //marker
2353         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2354         skip_bits(&s->gb, 1); //marker
2355     }
2356
2357     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2358         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2359             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2360             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2361             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2362         );
2363 }
2364
2365 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2366 {
2367     int i, v, j;
2368
2369     dprintf("matrix extension\n");
2370
2371     if (get_bits1(&s->gb)) {
2372         for(i=0;i<64;i++) {
2373             v = get_bits(&s->gb, 8);
2374             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2375             s->intra_matrix[j] = v;
2376             s->chroma_intra_matrix[j] = v;
2377         }
2378     }
2379     if (get_bits1(&s->gb)) {
2380         for(i=0;i<64;i++) {
2381             v = get_bits(&s->gb, 8);
2382             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2383             s->inter_matrix[j] = v;
2384             s->chroma_inter_matrix[j] = v;
2385         }
2386     }
2387     if (get_bits1(&s->gb)) {
2388         for(i=0;i<64;i++) {
2389             v = get_bits(&s->gb, 8);
2390             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2391             s->chroma_intra_matrix[j] = v;
2392         }
2393     }
2394     if (get_bits1(&s->gb)) {
2395         for(i=0;i<64;i++) {
2396             v = get_bits(&s->gb, 8);
2397             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2398             s->chroma_inter_matrix[j] = v;
2399         }
2400     }
2401 }
2402
2403 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2404 {
2405     s->full_pel[0] = s->full_pel[1] = 0;
2406     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2407     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2408     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2409     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2410     s->intra_dc_precision = get_bits(&s->gb, 2);
2411     s->picture_structure = get_bits(&s->gb, 2);
2412     s->top_field_first = get_bits1(&s->gb);
2413     s->frame_pred_frame_dct = get_bits1(&s->gb);
2414     s->concealment_motion_vectors = get_bits1(&s->gb);
2415     s->q_scale_type = get_bits1(&s->gb);
2416     s->intra_vlc_format = get_bits1(&s->gb);
2417     s->alternate_scan = get_bits1(&s->gb);
2418     s->repeat_first_field = get_bits1(&s->gb);
2419     s->chroma_420_type = get_bits1(&s->gb);
2420     s->progressive_frame = get_bits1(&s->gb);
2421
2422     if(s->picture_structure == PICT_FRAME){
2423         s->first_field=0;
2424         s->v_edge_pos= 16*s->mb_height;
2425     }else{
2426         s->first_field ^= 1;
2427         s->v_edge_pos=  8*s->mb_height;
2428         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2429     }
2430
2431     if(s->alternate_scan){
2432         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2433         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2434     }else{
2435         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2436         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2437     }
2438
2439     /* composite display not parsed */
2440     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2441     dprintf("picture_structure=%d\n", s->picture_structure);
2442     dprintf("top field first=%d\n", s->top_field_first);
2443     dprintf("repeat first field=%d\n", s->repeat_first_field);
2444     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2445     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2446     dprintf("alternate_scan=%d\n", s->alternate_scan);
2447     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2448     dprintf("progressive_frame=%d\n", s->progressive_frame);
2449 }
2450
2451 static void mpeg_decode_extension(AVCodecContext *avctx,
2452                                   const uint8_t *buf, int buf_size)
2453 {
2454     Mpeg1Context *s1 = avctx->priv_data;
2455     MpegEncContext *s = &s1->mpeg_enc_ctx;
2456     int ext_type;
2457
2458     init_get_bits(&s->gb, buf, buf_size*8);
2459
2460     ext_type = get_bits(&s->gb, 4);
2461     switch(ext_type) {
2462     case 0x1:
2463         mpeg_decode_sequence_extension(s1);
2464         break;
2465     case 0x2:
2466         mpeg_decode_sequence_display_extension(s1);
2467         break;
2468     case 0x3:
2469         mpeg_decode_quant_matrix_extension(s);
2470         break;
2471     case 0x7:
2472         mpeg_decode_picture_display_extension(s1);
2473         break;
2474     case 0x8:
2475         mpeg_decode_picture_coding_extension(s);
2476         break;
2477     }
2478 }
2479
2480 static void exchange_uv(MpegEncContext *s){
2481     short * tmp = s->pblocks[4];
2482     s->pblocks[4] = s->pblocks[5];
2483     s->pblocks[5] = tmp;
2484 }
2485
2486 static int mpeg_field_start(MpegEncContext *s){
2487     AVCodecContext *avctx= s->avctx;
2488     Mpeg1Context *s1 = (Mpeg1Context*)s;
2489
2490     /* start frame decoding */
2491     if(s->first_field || s->picture_structure==PICT_FRAME){
2492         if(MPV_frame_start(s, avctx) < 0)
2493             return -1;
2494
2495         ff_er_frame_start(s);
2496
2497         /* first check if we must repeat the frame */
2498         s->current_picture_ptr->repeat_pict = 0;
2499         if (s->repeat_first_field) {
2500             if (s->progressive_sequence) {
2501                 if (s->top_field_first)
2502                     s->current_picture_ptr->repeat_pict = 4;
2503                 else
2504                     s->current_picture_ptr->repeat_pict = 2;
2505             } else if (s->progressive_frame) {
2506                 s->current_picture_ptr->repeat_pict = 1;
2507             }
2508         }
2509
2510         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2511     }else{ //second field
2512             int i;
2513
2514             if(!s->current_picture_ptr){
2515                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2516                 return -1;
2517             }
2518
2519             for(i=0; i<4; i++){
2520                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2521                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2522                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2523                 }
2524             }
2525     }
2526 #ifdef HAVE_XVMC
2527 // MPV_frame_start will call this function too,
2528 // but we need to call it on every field
2529     if(s->avctx->xvmc_acceleration)
2530          XVMC_field_start(s,avctx);
2531 #endif
2532
2533     return 0;
2534 }
2535
2536 #define DECODE_SLICE_ERROR -1
2537 #define DECODE_SLICE_OK 0
2538
2539 /**
2540  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2541  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2542  *         DECODE_SLICE_OK if this slice is ok<br>
2543  */
2544 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2545                              const uint8_t **buf, int buf_size)
2546 {
2547     MpegEncContext *s = &s1->mpeg_enc_ctx;
2548     AVCodecContext *avctx= s->avctx;
2549     int ret;
2550     const int field_pic= s->picture_structure != PICT_FRAME;
2551     const int lowres= s->avctx->lowres;
2552
2553     s->resync_mb_x=
2554     s->resync_mb_y= -1;
2555
2556     if (mb_y<<field_pic >= s->mb_height){
2557         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2558         return -1;
2559     }
2560
2561     init_get_bits(&s->gb, *buf, buf_size*8);
2562
2563     ff_mpeg1_clean_buffers(s);
2564     s->interlaced_dct = 0;
2565
2566     s->qscale = get_qscale(s);
2567
2568     if(s->qscale == 0){
2569         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2570         return -1;
2571     }
2572
2573     /* extra slice info */
2574     while (get_bits1(&s->gb) != 0) {
2575         skip_bits(&s->gb, 8);
2576     }
2577
2578     s->mb_x=0;
2579
2580     for(;;) {
2581         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2582         if (code < 0){
2583             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2584             return -1;
2585         }
2586         if (code >= 33) {
2587             if (code == 33) {
2588                 s->mb_x += 33;
2589             }
2590             /* otherwise, stuffing, nothing to do */
2591         } else {
2592             s->mb_x += code;
2593             break;
2594         }
2595     }
2596     if(s->mb_x >= (unsigned)s->mb_width){
2597         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
2598         return -1;
2599     }
2600
2601     s->resync_mb_x= s->mb_x;
2602     s->resync_mb_y= s->mb_y= mb_y;
2603     s->mb_skip_run= 0;
2604     ff_init_block_index(s);
2605
2606     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2607         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2608              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",
2609                  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],
2610                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2611                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2612                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2613                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2614         }
2615     }
2616
2617     for(;;) {
2618 #ifdef HAVE_XVMC
2619         //one 1 we memcpy blocks in xvmcvideo
2620         if(s->avctx->xvmc_acceleration > 1)
2621             XVMC_init_block(s);//set s->block
2622 #endif
2623
2624         ret = mpeg_decode_mb(s, s->block);
2625         s->chroma_qscale= s->qscale;
2626
2627         dprintf("ret=%d\n", ret);
2628         if (ret < 0)
2629             return -1;
2630
2631         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2632             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2633             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2634             int motion_x, motion_y, dir, i;
2635             if(field_pic && !s->first_field)
2636                 xy += wrap/2;
2637
2638             for(i=0; i<2; i++){
2639                 for(dir=0; dir<2; dir++){
2640                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2641                         motion_x = motion_y = 0;
2642                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2643                         motion_x = s->mv[dir][0][0];
2644                         motion_y = s->mv[dir][0][1];
2645                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2646                         motion_x = s->mv[dir][i][0];
2647                         motion_y = s->mv[dir][i][1];
2648                     }
2649
2650                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2651                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2652                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2653                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2654                     s->current_picture.ref_index [dir][xy    ]=
2655                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2656                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2657                 }
2658                 xy += wrap;
2659             }
2660         }
2661
2662         s->dest[0] += 16 >> lowres;
2663         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2664         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2665
2666         MPV_decode_mb(s, s->block);
2667
2668         if (++s->mb_x >= s->mb_width) {
2669             const int mb_size= 16>>s->avctx->lowres;
2670
2671             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2672
2673             s->mb_x = 0;
2674             s->mb_y++;
2675
2676             if(s->mb_y<<field_pic >= s->mb_height){
2677                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2678                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2679                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2680                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2681
2682                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2683                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2684                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2685                     return -1;
2686                 }else
2687                     goto eos;
2688             }
2689
2690             ff_init_block_index(s);
2691         }
2692
2693         /* skip mb handling */
2694         if (s->mb_skip_run == -1) {
2695             /* read again increment */
2696             s->mb_skip_run = 0;
2697             for(;;) {
2698                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2699                 if (code < 0){
2700                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2701                     return -1;
2702                 }
2703                 if (code >= 33) {
2704                     if (code == 33) {
2705                         s->mb_skip_run += 33;
2706                     }else if(code == 35){
2707                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2708                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2709                             return -1;
2710                         }
2711                         goto eos; /* end of slice */
2712                     }
2713                     /* otherwise, stuffing, nothing to do */
2714                 } else {
2715                     s->mb_skip_run += code;
2716                     break;
2717                 }
2718             }
2719         }
2720     }
2721 eos: // end of slice
2722     *buf += get_bits_count(&s->gb)/8 - 1;
2723 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2724     return 0;
2725 }
2726
2727 static int slice_decode_thread(AVCodecContext *c, void *arg){
2728     MpegEncContext *s= arg;
2729     const uint8_t *buf= s->gb.buffer;
2730     int mb_y= s->start_mb_y;
2731
2732     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2733
2734     for(;;){
2735         uint32_t start_code;
2736         int ret;
2737
2738         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2739         emms_c();
2740 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2741 //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);
2742         if(ret < 0){
2743             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2744                 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);
2745         }else{
2746             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);
2747         }
2748
2749         if(s->mb_y == s->end_mb_y)
2750             return 0;
2751
2752         start_code= -1;
2753         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2754         mb_y= start_code - SLICE_MIN_START_CODE;
2755         if(mb_y < 0 || mb_y >= s->end_mb_y)
2756             return -1;
2757     }
2758
2759     return 0; //not reached
2760 }
2761
2762 /**
2763  * handles slice ends.
2764  * @return 1 if it seems to be the last slice of
2765  */
2766 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2767 {
2768     Mpeg1Context *s1 = avctx->priv_data;
2769     MpegEncContext *s = &s1->mpeg_enc_ctx;
2770
2771     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2772         return 0;
2773
2774 #ifdef HAVE_XVMC
2775     if(s->avctx->xvmc_acceleration)
2776         XVMC_field_end(s);
2777 #endif
2778     /* end of slice reached */
2779     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2780         /* end of image */
2781
2782         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2783
2784         ff_er_frame_end(s);
2785
2786         MPV_frame_end(s);
2787
2788         if (s->pict_type == B_TYPE || s->low_delay) {
2789             *pict= *(AVFrame*)s->current_picture_ptr;
2790             ff_print_debug_info(s, pict);
2791         } else {
2792             s->picture_number++;
2793             /* latency of 1 frame for I and P frames */
2794             /* XXX: use another variable than picture_number */
2795             if (s->last_picture_ptr != NULL) {
2796                 *pict= *(AVFrame*)s->last_picture_ptr;
2797                  ff_print_debug_info(s, pict);
2798             }
2799         }
2800
2801         return 1;
2802     } else {
2803         return 0;
2804     }
2805 }
2806
2807 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2808                                  const uint8_t *buf, int buf_size)
2809 {
2810     Mpeg1Context *s1 = avctx->priv_data;
2811     MpegEncContext *s = &s1->mpeg_enc_ctx;
2812     int width,height;
2813     int i, v, j;
2814
2815     init_get_bits(&s->gb, buf, buf_size*8);
2816
2817     width = get_bits(&s->gb, 12);
2818     height = get_bits(&s->gb, 12);
2819     if (width <= 0 || height <= 0 ||
2820         (width % 2) != 0 || (height % 2) != 0)
2821         return -1;
2822     s->aspect_ratio_info= get_bits(&s->gb, 4);
2823     if (s->aspect_ratio_info == 0)
2824         return -1;
2825     s->frame_rate_index = get_bits(&s->gb, 4);
2826     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2827         return -1;
2828     s->bit_rate = get_bits(&s->gb, 18) * 400;
2829     if (get_bits1(&s->gb) == 0) /* marker */
2830         return -1;
2831     s->width = width;
2832     s->height = height;
2833
2834     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2835     skip_bits(&s->gb, 1);
2836
2837     /* get matrix */
2838     if (get_bits1(&s->gb)) {
2839         for(i=0;i<64;i++) {
2840             v = get_bits(&s->gb, 8);
2841             if(v==0){
2842                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2843                 return -1;
2844             }
2845             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2846             s->intra_matrix[j] = v;
2847             s->chroma_intra_matrix[j] = v;
2848         }
2849 #ifdef DEBUG
2850         dprintf("intra matrix present\n");
2851         for(i=0;i<64;i++)
2852             dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2853         dprintf("\n");
2854 #endif
2855     } else {
2856         for(i=0;i<64;i++) {
2857             j = s->dsp.idct_permutation[i];
2858             v = ff_mpeg1_default_intra_matrix[i];
2859             s->intra_matrix[j] = v;
2860             s->chroma_intra_matrix[j] = v;
2861         }
2862     }
2863     if (get_bits1(&s->gb)) {
2864         for(i=0;i<64;i++) {
2865             v = get_bits(&s->gb, 8);
2866             if(v==0){
2867                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2868                 return -1;
2869             }
2870             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2871             s->inter_matrix[j] = v;
2872             s->chroma_inter_matrix[j] = v;
2873         }
2874 #ifdef DEBUG
2875         dprintf("non intra matrix present\n");
2876         for(i=0;i<64;i++)
2877             dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2878         dprintf("\n");
2879 #endif
2880     } else {
2881         for(i=0;i<64;i++) {
2882             int j= s->dsp.idct_permutation[i];
2883             v = ff_mpeg1_default_non_intra_matrix[i];
2884             s->inter_matrix[j] = v;
2885             s->chroma_inter_matrix[j] = v;
2886         }
2887     }
2888
2889     if(show_bits(&s->gb, 23) != 0){
2890         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2891         return -1;
2892     }
2893
2894     /* we set mpeg2 parameters so that it emulates mpeg1 */
2895     s->progressive_sequence = 1;
2896     s->progressive_frame = 1;
2897     s->picture_structure = PICT_FRAME;
2898     s->frame_pred_frame_dct = 1;
2899     s->chroma_format = 1;
2900     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2901     avctx->sub_id = 1; /* indicates mpeg1 */
2902     s->out_format = FMT_MPEG1;
2903     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2904     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2905
2906     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2907         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2908                s->avctx->rc_buffer_size, s->bit_rate);
2909
2910     return 0;
2911 }
2912
2913 static int vcr2_init_sequence(AVCodecContext *avctx)
2914 {
2915     Mpeg1Context *s1 = avctx->priv_data;
2916     MpegEncContext *s = &s1->mpeg_enc_ctx;
2917     int i, v;
2918
2919     /* start new mpeg1 context decoding */
2920     s->out_format = FMT_MPEG1;
2921     if (s1->mpeg_enc_ctx_allocated) {
2922         MPV_common_end(s);
2923     }
2924     s->width  = avctx->coded_width;
2925     s->height = avctx->coded_height;
2926     avctx->has_b_frames= 0; //true?
2927     s->low_delay= 1;
2928
2929     if(avctx->xvmc_acceleration){
2930         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2931     }else{
2932         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2933     }
2934
2935     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2936         if( avctx->idct_algo == FF_IDCT_AUTO )
2937             avctx->idct_algo = FF_IDCT_SIMPLE;
2938
2939     if (MPV_common_init(s) < 0)
2940         return -1;
2941     exchange_uv(s);//common init reset pblocks, so we swap them here
2942     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2943     s1->mpeg_enc_ctx_allocated = 1;
2944
2945     for(i=0;i<64;i++) {
2946         int j= s->dsp.idct_permutation[i];
2947         v = ff_mpeg1_default_intra_matrix[i];
2948         s->intra_matrix[j] = v;
2949         s->chroma_intra_matrix[j] = v;
2950
2951         v = ff_mpeg1_default_non_intra_matrix[i];
2952         s->inter_matrix[j] = v;
2953         s->chroma_inter_matrix[j] = v;
2954     }
2955
2956     s->progressive_sequence = 1;
2957     s->progressive_frame = 1;
2958     s->picture_structure = PICT_FRAME;
2959     s->frame_pred_frame_dct = 1;
2960     s->chroma_format = 1;
2961     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2962     avctx->sub_id = 2; /* indicates mpeg2 */
2963     return 0;
2964 }
2965
2966
2967 static void mpeg_decode_user_data(AVCodecContext *avctx,
2968                                   const uint8_t *buf, int buf_size)
2969 {
2970     const uint8_t *p;
2971     int len, flags;
2972     p = buf;
2973     len = buf_size;
2974
2975     /* we parse the DTG active format information */
2976     if (len >= 5 &&
2977         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2978         flags = p[4];
2979         p += 5;
2980         len -= 5;
2981         if (flags & 0x80) {
2982             /* skip event id */
2983             if (len < 2)
2984                 return;
2985             p += 2;
2986             len -= 2;
2987         }
2988         if (flags & 0x40) {
2989             if (len < 1)
2990                 return;
2991             avctx->dtg_active_format = p[0] & 0x0f;
2992         }
2993     }
2994 }
2995
2996 static void mpeg_decode_gop(AVCodecContext *avctx,
2997                             const uint8_t *buf, int buf_size){
2998     Mpeg1Context *s1 = avctx->priv_data;
2999     MpegEncContext *s = &s1->mpeg_enc_ctx;
3000
3001     int drop_frame_flag;
3002     int time_code_hours, time_code_minutes;
3003     int time_code_seconds, time_code_pictures;
3004     int broken_link;
3005
3006     init_get_bits(&s->gb, buf, buf_size*8);
3007
3008     drop_frame_flag = get_bits1(&s->gb);
3009
3010     time_code_hours=get_bits(&s->gb,5);
3011     time_code_minutes = get_bits(&s->gb,6);
3012     skip_bits1(&s->gb);//marker bit
3013     time_code_seconds = get_bits(&s->gb,6);
3014     time_code_pictures = get_bits(&s->gb,6);
3015
3016     /*broken_link indicate that after editing the
3017       reference frames of the first B-Frames after GOP I-Frame
3018       are missing (open gop)*/
3019     broken_link = get_bits1(&s->gb);
3020
3021     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
3022         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
3023             time_code_hours, time_code_minutes, time_code_seconds,
3024             time_code_pictures, broken_link);
3025 }
3026 /**
3027  * finds the end of the current frame in the bitstream.
3028  * @return the position of the first byte of the next frame, or -1
3029  */
3030 static int mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
3031 {
3032     int i;
3033     uint32_t state= pc->state;
3034
3035     i=0;
3036     if(!pc->frame_start_found){
3037         for(i=0; i<buf_size; i++){
3038             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3039             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3040                 i++;
3041                 pc->frame_start_found=1;
3042                 break;
3043             }
3044         }
3045     }
3046
3047     if(pc->frame_start_found){
3048         /* EOF considered as end of frame */
3049         if (buf_size == 0)
3050             return 0;
3051         for(; i<buf_size; i++){
3052             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3053             if((state&0xFFFFFF00) == 0x100){
3054                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3055                     pc->frame_start_found=0;
3056                     pc->state=-1;
3057                     return i-3;
3058                 }
3059             }
3060         }
3061     }
3062     pc->state= state;
3063     return END_NOT_FOUND;
3064 }
3065
3066 /* handle buffering and image synchronisation */
3067 static int mpeg_decode_frame(AVCodecContext *avctx,
3068                              void *data, int *data_size,
3069                              uint8_t *buf, int buf_size)
3070 {
3071     Mpeg1Context *s = avctx->priv_data;
3072     const uint8_t *buf_end;
3073     const uint8_t *buf_ptr;
3074     uint32_t start_code;
3075     int ret, input_size;
3076     AVFrame *picture = data;
3077     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3078     dprintf("fill_buffer\n");
3079
3080     if (buf_size == 0) {
3081         /* special case for last picture */
3082         if (s2->low_delay==0 && s2->next_picture_ptr) {
3083             *picture= *(AVFrame*)s2->next_picture_ptr;
3084             s2->next_picture_ptr= NULL;
3085
3086             *data_size = sizeof(AVFrame);
3087         }
3088         return 0;
3089     }
3090
3091     if(s2->flags&CODEC_FLAG_TRUNCATED){
3092         int next= mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3093
3094         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3095             return buf_size;
3096     }
3097
3098     buf_ptr = buf;
3099     buf_end = buf + buf_size;
3100
3101 #if 0
3102     if (s->repeat_field % 2 == 1) {
3103         s->repeat_field++;
3104         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3105         //        s2->picture_number, s->repeat_field);
3106         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3107             *data_size = sizeof(AVPicture);
3108             goto the_end;
3109         }
3110     }
3111 #endif
3112
3113     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3114         vcr2_init_sequence(avctx);
3115
3116     s->slice_count= 0;
3117
3118     for(;;) {
3119         /* find start next code */
3120         start_code = -1;
3121         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3122         if (start_code > 0x1ff){
3123             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3124                 if(avctx->thread_count > 1){
3125                     int i;
3126
3127                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3128                     for(i=0; i<s->slice_count; i++)
3129                         s2->error_count += s2->thread_context[i]->error_count;
3130                 }
3131                 if (slice_end(avctx, picture)) {
3132                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3133                         *data_size = sizeof(AVPicture);
3134                 }
3135             }
3136             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3137         }
3138
3139         input_size = buf_end - buf_ptr;
3140
3141         if(avctx->debug & FF_DEBUG_STARTCODE){
3142             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3143         }
3144
3145         /* prepare data for next start code */
3146         switch(start_code) {
3147         case SEQ_START_CODE:
3148             mpeg1_decode_sequence(avctx, buf_ptr,
3149                                     input_size);
3150             break;
3151
3152         case PICTURE_START_CODE:
3153             /* we have a complete image : we try to decompress it */
3154             mpeg1_decode_picture(avctx,
3155                                     buf_ptr, input_size);
3156             break;
3157         case EXT_START_CODE:
3158             mpeg_decode_extension(avctx,
3159                                     buf_ptr, input_size);
3160             break;
3161         case USER_START_CODE:
3162             mpeg_decode_user_data(avctx,
3163                                     buf_ptr, input_size);
3164             break;
3165         case GOP_START_CODE:
3166             s2->first_field=0;
3167             mpeg_decode_gop(avctx,
3168                                     buf_ptr, input_size);
3169             break;
3170         default:
3171             if (start_code >= SLICE_MIN_START_CODE &&
3172                 start_code <= SLICE_MAX_START_CODE) {
3173                 int mb_y= start_code - SLICE_MIN_START_CODE;
3174
3175                 if(s2->last_picture_ptr==NULL){
3176                 /* skip b frames if we dont have reference frames */
3177                     if(s2->pict_type==B_TYPE) break;
3178                 /* skip P frames if we dont have reference frame no valid header */
3179 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3180                 }
3181                 /* skip b frames if we are in a hurry */
3182                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3183                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3184                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3185                     || avctx->skip_frame >= AVDISCARD_ALL)
3186                     break;
3187                 /* skip everything if we are in a hurry>=5 */
3188                 if(avctx->hurry_up>=5) break;
3189
3190                 if (!s->mpeg_enc_ctx_allocated) break;
3191
3192                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3193                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3194                         break;
3195                 }
3196
3197                 if(s2->first_slice){
3198                     s2->first_slice=0;
3199                             if(mpeg_field_start(s2) < 0)
3200                         return -1;
3201                     }
3202                 if(!s2->current_picture_ptr){
3203                     av_log(avctx, AV_LOG_ERROR, "current_picture not initalized\n");
3204                     return -1;
3205                 }
3206
3207                 if(avctx->thread_count > 1){
3208                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3209                     if(threshold <= mb_y){
3210                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3211
3212                         thread_context->start_mb_y= mb_y;
3213                         thread_context->end_mb_y  = s2->mb_height;
3214                         if(s->slice_count){
3215                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3216                             ff_update_duplicate_context(thread_context, s2);
3217                         }
3218                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3219                         s->slice_count++;
3220                     }
3221                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
3222                 }else{
3223                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3224                     emms_c();
3225
3226                     if(ret < 0){
3227                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3228                             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);
3229                     }else{
3230                         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);
3231                     }
3232                 }
3233             }
3234             break;
3235         }
3236     }
3237 }
3238
3239 static int mpeg_decode_end(AVCodecContext *avctx)
3240 {
3241     Mpeg1Context *s = avctx->priv_data;
3242
3243     if (s->mpeg_enc_ctx_allocated)
3244         MPV_common_end(&s->mpeg_enc_ctx);
3245     return 0;
3246 }
3247
3248 AVCodec mpeg1video_decoder = {
3249     "mpeg1video",
3250     CODEC_TYPE_VIDEO,
3251     CODEC_ID_MPEG1VIDEO,
3252     sizeof(Mpeg1Context),
3253     mpeg_decode_init,
3254     NULL,
3255     mpeg_decode_end,
3256     mpeg_decode_frame,
3257     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3258     .flush= ff_mpeg_flush,
3259 };
3260
3261 AVCodec mpeg2video_decoder = {
3262     "mpeg2video",
3263     CODEC_TYPE_VIDEO,
3264     CODEC_ID_MPEG2VIDEO,
3265     sizeof(Mpeg1Context),
3266     mpeg_decode_init,
3267     NULL,
3268     mpeg_decode_end,
3269     mpeg_decode_frame,
3270     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3271     .flush= ff_mpeg_flush,
3272 };
3273
3274 //legacy decoder
3275 AVCodec mpegvideo_decoder = {
3276     "mpegvideo",
3277     CODEC_TYPE_VIDEO,
3278     CODEC_ID_MPEG2VIDEO,
3279     sizeof(Mpeg1Context),
3280     mpeg_decode_init,
3281     NULL,
3282     mpeg_decode_end,
3283     mpeg_decode_frame,
3284     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3285     .flush= ff_mpeg_flush,
3286 };
3287
3288 #ifdef CONFIG_ENCODERS
3289
3290 AVCodec mpeg1video_encoder = {
3291     "mpeg1video",
3292     CODEC_TYPE_VIDEO,
3293     CODEC_ID_MPEG1VIDEO,
3294     sizeof(MpegEncContext),
3295     encode_init,
3296     MPV_encode_picture,
3297     MPV_encode_end,
3298     .supported_framerates= ff_frame_rate_tab+1,
3299     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3300     .capabilities= CODEC_CAP_DELAY,
3301 };
3302
3303 AVCodec mpeg2video_encoder = {
3304     "mpeg2video",
3305     CODEC_TYPE_VIDEO,
3306     CODEC_ID_MPEG2VIDEO,
3307     sizeof(MpegEncContext),
3308     encode_init,
3309     MPV_encode_picture,
3310     MPV_encode_end,
3311     .supported_framerates= ff_frame_rate_tab+1,
3312     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3313     .capabilities= CODEC_CAP_DELAY,
3314 };
3315 #endif
3316
3317 #ifdef HAVE_XVMC
3318 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3319     Mpeg1Context *s;
3320
3321     if( avctx->thread_count > 1)
3322         return -1;
3323     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3324         return -1;
3325     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3326         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3327     }
3328     mpeg_decode_init(avctx);
3329     s = avctx->priv_data;
3330
3331     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3332     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3333
3334     return 0;
3335 }
3336
3337 AVCodec mpeg_xvmc_decoder = {
3338     "mpegvideo_xvmc",
3339     CODEC_TYPE_VIDEO,
3340     CODEC_ID_MPEG2VIDEO_XVMC,
3341     sizeof(Mpeg1Context),
3342     mpeg_mc_decode_init,
3343     NULL,
3344     mpeg_decode_end,
3345     mpeg_decode_frame,
3346     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3347     .flush= ff_mpeg_flush,
3348 };
3349
3350 #endif
3351
3352 #ifdef CONFIG_MPEGVIDEO_PARSER
3353 static void mpegvideo_extract_headers(AVCodecParserContext *s,
3354                                       AVCodecContext *avctx,
3355                                       const uint8_t *buf, int buf_size)
3356 {
3357     ParseContext1 *pc = s->priv_data;
3358     const uint8_t *buf_end;
3359     uint32_t start_code;
3360     int frame_rate_index, ext_type, bytes_left;
3361     int frame_rate_ext_n, frame_rate_ext_d;
3362     int picture_structure, top_field_first, repeat_first_field, progressive_frame;
3363     int horiz_size_ext, vert_size_ext, bit_rate_ext;
3364 //FIXME replace the crap with get_bits()
3365     s->repeat_pict = 0;
3366     buf_end = buf + buf_size;
3367     while (buf < buf_end) {
3368         start_code= -1;
3369         buf= ff_find_start_code(buf, buf_end, &start_code);
3370         bytes_left = buf_end - buf;
3371         switch(start_code) {
3372         case PICTURE_START_CODE:
3373             if (bytes_left >= 2) {
3374                 s->pict_type = (buf[1] >> 3) & 7;
3375             }
3376             break;
3377         case SEQ_START_CODE:
3378             if (bytes_left >= 7) {
3379                 pc->width  = (buf[0] << 4) | (buf[1] >> 4);
3380                 pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
3381                 avcodec_set_dimensions(avctx, pc->width, pc->height);
3382                 frame_rate_index = buf[3] & 0xf;
3383                 pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
3384                 pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
3385                 avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
3386                 avctx->codec_id = CODEC_ID_MPEG1VIDEO;
3387                 avctx->sub_id = 1;
3388             }
3389             break;
3390         case EXT_START_CODE:
3391             if (bytes_left >= 1) {
3392                 ext_type = (buf[0] >> 4);
3393                 switch(ext_type) {
3394                 case 0x1: /* sequence extension */
3395                     if (bytes_left >= 6) {
3396                         horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
3397                         vert_size_ext = (buf[2] >> 5) & 3;
3398                         bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
3399                         frame_rate_ext_n = (buf[5] >> 5) & 3;
3400                         frame_rate_ext_d = (buf[5] & 0x1f);
3401                         pc->progressive_sequence = buf[1] & (1 << 3);
3402                         avctx->has_b_frames= !(buf[5] >> 7);
3403
3404                         pc->width  |=(horiz_size_ext << 12);
3405                         pc->height |=( vert_size_ext << 12);
3406                         avctx->bit_rate += (bit_rate_ext << 18) * 400;
3407                         avcodec_set_dimensions(avctx, pc->width, pc->height);
3408                         avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
3409                         avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
3410                         avctx->codec_id = CODEC_ID_MPEG2VIDEO;
3411                         avctx->sub_id = 2; /* forces MPEG2 */
3412                     }
3413                     break;
3414                 case 0x8: /* picture coding extension */
3415                     if (bytes_left >= 5) {
3416                         picture_structure = buf[2]&3;
3417                         top_field_first = buf[3] & (1 << 7);
3418                         repeat_first_field = buf[3] & (1 << 1);
3419                         progressive_frame = buf[4] & (1 << 7);
3420
3421                         /* check if we must repeat the frame */
3422                         if (repeat_first_field) {
3423                             if (pc->progressive_sequence) {
3424                                 if (top_field_first)
3425                                     s->repeat_pict = 4;
3426                                 else
3427                                     s->repeat_pict = 2;
3428                             } else if (progressive_frame) {
3429                                 s->repeat_pict = 1;
3430                             }
3431                         }
3432
3433                         /* the packet only represents half a frame
3434                            XXX,FIXME maybe find a different solution */
3435                         if(picture_structure != 3)
3436                             s->repeat_pict = -1;
3437                     }
3438                     break;
3439                 }
3440             }
3441             break;
3442         case -1:
3443             goto the_end;
3444         default:
3445             /* we stop parsing when we encounter a slice. It ensures
3446                that this function takes a negligible amount of time */
3447             if (start_code >= SLICE_MIN_START_CODE &&
3448                 start_code <= SLICE_MAX_START_CODE)
3449                 goto the_end;
3450             break;
3451         }
3452     }
3453  the_end: ;
3454 }
3455
3456 static int mpegvideo_parse(AVCodecParserContext *s,
3457                            AVCodecContext *avctx,
3458                            uint8_t **poutbuf, int *poutbuf_size,
3459                            const uint8_t *buf, int buf_size)
3460 {
3461     ParseContext1 *pc1 = s->priv_data;
3462     ParseContext *pc= &pc1->pc;
3463     int next;
3464
3465     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
3466         next= buf_size;
3467     }else{
3468         next= mpeg1_find_frame_end(pc, buf, buf_size);
3469
3470         if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
3471             *poutbuf = NULL;
3472             *poutbuf_size = 0;
3473             return buf_size;
3474         }
3475
3476     }
3477     /* we have a full frame : we just parse the first few MPEG headers
3478        to have the full timing information. The time take by this
3479        function should be negligible for uncorrupted streams */
3480     mpegvideo_extract_headers(s, avctx, buf, buf_size);
3481 #if 0
3482     printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
3483            s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
3484 #endif
3485
3486     *poutbuf = (uint8_t *)buf;
3487     *poutbuf_size = buf_size;
3488     return next;
3489 }
3490
3491 static int mpegvideo_split(AVCodecContext *avctx,
3492                            const uint8_t *buf, int buf_size)
3493 {
3494     int i;
3495     uint32_t state= -1;
3496
3497     for(i=0; i<buf_size; i++){
3498         state= (state<<8) | buf[i];
3499         if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
3500             return i-3;
3501     }
3502     return 0;
3503 }
3504
3505 AVCodecParser mpegvideo_parser = {
3506     { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
3507     sizeof(ParseContext1),
3508     NULL,
3509     mpegvideo_parse,
3510     ff_parse1_close,
3511     mpegvideo_split,
3512 };
3513 #endif /* !CONFIG_MPEGVIDEO_PARSER */
3514
3515 /* this is ugly i know, but the alternative is too make
3516    hundreds of vars global and prefix them with ff_mpeg1_
3517    which is far uglier. */
3518 #include "mdec.c"