47c78874249449a819e69c7b56660ebe73bde734
[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 library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20  
21 /**
22  * @file mpeg12.c
23  * MPEG1/2 codec
24  */
25  
26 //#define DEBUG
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "mpegvideo.h"
30
31 #include "mpeg12data.h"
32
33 //#undef NDEBUG
34 //#include <assert.h>
35
36
37 /* Start codes. */
38 #define SEQ_END_CODE            0x000001b7
39 #define SEQ_START_CODE          0x000001b3
40 #define GOP_START_CODE          0x000001b8
41 #define PICTURE_START_CODE      0x00000100
42 #define SLICE_MIN_START_CODE    0x00000101
43 #define SLICE_MAX_START_CODE    0x000001af
44 #define EXT_START_CODE          0x000001b5
45 #define USER_START_CODE         0x000001b2
46
47 #define DC_VLC_BITS 9
48 #define MV_VLC_BITS 9
49 #define MBINCR_VLC_BITS 9
50 #define MB_PAT_VLC_BITS 9
51 #define MB_PTYPE_VLC_BITS 6
52 #define MB_BTYPE_VLC_BITS 6
53 #define TEX_VLC_BITS 9
54
55 #ifdef CONFIG_ENCODERS
56 static void mpeg1_encode_block(MpegEncContext *s, 
57                          DCTELEM *block, 
58                          int component);
59 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
60 #endif //CONFIG_ENCODERS
61 static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
62                               DCTELEM *block, 
63                               int n);
64 static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
65                               DCTELEM *block, 
66                               int n);
67 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
68 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
69                                         DCTELEM *block, 
70                                         int n);
71 static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
72                                     DCTELEM *block, 
73                                     int n);
74 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
75 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
76 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
77 static void exchange_uv(MpegEncContext *s);
78
79 #ifdef HAVE_XVMC
80 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
81 extern int XVMC_field_end(MpegEncContext *s);
82 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
83 extern void XVMC_init_block(MpegEncContext *s);//set s->block
84 #endif
85
86 const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
87 const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
88 const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
89 const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
90                                            PIX_FMT_XVMC_MPEG2_IDCT,
91                                            PIX_FMT_XVMC_MPEG2_MC,
92                                            -1};
93 #ifdef CONFIG_ENCODERS
94 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
95 static uint8_t fcode_tab[MAX_MV*2+1];
96
97 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
98 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
99
100 /* simple include everything table for dc, first byte is bits number next 3 are code*/
101 static uint32_t mpeg1_lum_dc_uni[512];
102 static uint32_t mpeg1_chr_dc_uni[512];
103
104 static uint8_t mpeg1_index_run[2][64];
105 static int8_t mpeg1_max_level[2][64];
106 #endif //CONFIG_ENCODERS
107
108 static void init_2d_vlc_rl(RLTable *rl, int use_static)
109 {
110     int i;
111     
112     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
113              &rl->table_vlc[0][1], 4, 2,
114              &rl->table_vlc[0][0], 4, 2, use_static);
115
116     if(use_static)    
117         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
118     else
119         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120
121     for(i=0; i<rl->vlc.table_size; i++){
122         int code= rl->vlc.table[i][0];
123         int len = rl->vlc.table[i][1];
124         int level, run;
125     
126         if(len==0){ // illegal code
127             run= 65;
128             level= MAX_LEVEL;
129         }else if(len<0){ //more bits needed
130             run= 0;
131             level= code;
132         }else{
133             if(code==rl->n){ //esc
134                 run= 65;
135                 level= 0;
136             }else if(code==rl->n+1){ //eob
137                 run= 0;
138                 level= 127;
139             }else{
140                 run=   rl->table_run  [code] + 1;
141                 level= rl->table_level[code];
142             }
143         }
144         rl->rl_vlc[0][i].len= len;
145         rl->rl_vlc[0][i].level= level;
146         rl->rl_vlc[0][i].run= run;
147     }
148 }
149
150 #ifdef CONFIG_ENCODERS
151 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
152     int i;
153
154     for(i=0; i<128; i++){
155         int level= i-64;
156         int run;
157         for(run=0; run<64; run++){
158             int len, bits, code;
159             
160             int alevel= ABS(level);
161             int sign= (level>>31)&1;
162
163             if (alevel > rl->max_level[0][run])
164                 code= 111; /*rl->n*/
165             else
166                 code= rl->index_run[0][run] + alevel - 1;
167
168             if (code < 111 /* rl->n */) {
169                 /* store the vlc & sign at once */
170                 len=   mpeg1_vlc[code][1]+1;
171                 bits= (mpeg1_vlc[code][0]<<1) + sign;
172             } else {
173                 len=  mpeg1_vlc[111/*rl->n*/][1]+6;
174                 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
175
176                 bits|= run;
177                 if (alevel < 128) {
178                     bits<<=8; len+=8;
179                     bits|= level & 0xff;
180                 } else {
181                     bits<<=16; len+=16;
182                     bits|= level & 0xff;
183                     if (level < 0) {
184                         bits|= 0x8001 + level + 255;
185                     } else {
186                         bits|= level & 0xffff;
187                     }
188                 }
189             }
190
191             uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
192             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
193         }
194     }
195 }
196
197
198 static int find_frame_rate_index(MpegEncContext *s){
199     int i;
200     int64_t dmin= INT64_MAX;
201     int64_t d;
202
203     for(i=1;i<14;i++) {
204         int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->time_base.num;
205         int64_t n1= 1001LL*s->avctx->time_base.den;
206         if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
207
208         d = ABS(n0 - n1);
209         if(d < dmin){
210             dmin=d;
211             s->frame_rate_index= i;
212         }
213     }
214     if(dmin)
215         return -1;
216     else
217         return 0;
218 }
219
220 static int encode_init(AVCodecContext *avctx)
221 {
222     MpegEncContext *s = avctx->priv_data;
223
224     if(MPV_encode_init(avctx) < 0)
225         return -1;
226
227     if(find_frame_rate_index(s) < 0){
228         if(s->strict_std_compliance >=0){
229             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
230             return -1;
231         }else{
232             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);
233         }
234     }
235     
236     return 0;
237 }
238
239 static void put_header(MpegEncContext *s, int header)
240 {
241     align_put_bits(&s->pb);
242     put_bits(&s->pb, 16, header>>16);
243     put_bits(&s->pb, 16, header&0xFFFF);
244 }
245
246 /* put sequence header if needed */
247 static void mpeg1_encode_sequence_header(MpegEncContext *s)
248 {
249         unsigned int vbv_buffer_size;
250         unsigned int fps, v;
251         int i;
252         uint64_t time_code;
253         float best_aspect_error= 1E10;
254         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
255         int constraint_parameter_flag;
256         
257         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
258         
259         if (s->current_picture.key_frame) {
260             AVRational framerate= frame_rate_tab[s->frame_rate_index];
261
262             /* mpeg1 header repeated every gop */
263             put_header(s, SEQ_START_CODE);
264  
265             put_bits(&s->pb, 12, s->width);
266             put_bits(&s->pb, 12, s->height);
267             
268             for(i=1; i<15; i++){
269                 float error= aspect_ratio;
270                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
271                     error-= 1.0/mpeg1_aspect[i];
272                 else
273                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
274              
275                 error= ABS(error);
276                 
277                 if(error < best_aspect_error){
278                     best_aspect_error= error;
279                     s->aspect_ratio_info= i;
280                 }
281             }
282             
283             put_bits(&s->pb, 4, s->aspect_ratio_info);
284             put_bits(&s->pb, 4, s->frame_rate_index);
285             
286             if(s->avctx->rc_max_rate){
287                 v = (s->avctx->rc_max_rate + 399) / 400;
288                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
289                     v = 0x3ffff;
290             }else{
291                 v= 0x3FFFF;
292             }
293
294             if(s->avctx->rc_buffer_size)
295                 vbv_buffer_size = s->avctx->rc_buffer_size;
296             else
297                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
298                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
299             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
300
301             put_bits(&s->pb, 18, v & 0x3FFFF);
302             put_bits(&s->pb, 1, 1); /* marker */
303             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
304
305             constraint_parameter_flag= 
306                 s->width <= 768 && s->height <= 576 && 
307                 s->mb_width * s->mb_height <= 396 &&
308                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
309                 framerate.num <= framerate.den*30 &&
310                 s->avctx->me_range && s->avctx->me_range < 128 &&
311                 vbv_buffer_size <= 20 &&
312                 v <= 1856000/400 &&
313                 s->codec_id == CODEC_ID_MPEG1VIDEO;
314                 
315             put_bits(&s->pb, 1, constraint_parameter_flag);
316             
317             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
318             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
319
320             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
321                 put_header(s, EXT_START_CODE);
322                 put_bits(&s->pb, 4, 1); //seq ext
323                 put_bits(&s->pb, 1, 0); //esc
324                 
325                 if(s->avctx->profile == FF_PROFILE_UNKNOWN){
326                     put_bits(&s->pb, 3, 4); //profile
327                 }else{
328                     put_bits(&s->pb, 3, s->avctx->profile); //profile
329                 }
330
331                 if(s->avctx->level == FF_LEVEL_UNKNOWN){
332                     put_bits(&s->pb, 4, 8); //level
333                 }else{
334                     put_bits(&s->pb, 4, s->avctx->level); //level
335                 }
336
337                 put_bits(&s->pb, 1, s->progressive_sequence);
338                 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
339                 put_bits(&s->pb, 2, 0); //horizontal size ext
340                 put_bits(&s->pb, 2, 0); //vertical size ext
341                 put_bits(&s->pb, 12, v>>18); //bitrate ext
342                 put_bits(&s->pb, 1, 1); //marker
343                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
344                 put_bits(&s->pb, 1, s->low_delay);
345                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
346                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
347             }
348             
349             put_header(s, GOP_START_CODE);
350             put_bits(&s->pb, 1, 0); /* do drop frame */
351             /* time code : we must convert from the real frame rate to a
352                fake mpeg frame rate in case of low frame rate */
353             fps = (framerate.num + framerate.den/2)/ framerate.den;
354             time_code = s->current_picture_ptr->coded_picture_number;
355
356             s->gop_picture_number = time_code;
357             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
358             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
359             put_bits(&s->pb, 1, 1);
360             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
361             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
362             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
363             put_bits(&s->pb, 1, 0); /* broken link */
364         }
365 }
366
367 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
368     while (run >= 33) {
369         put_bits(&s->pb, 11, 0x008);
370         run -= 33;
371     }
372     put_bits(&s->pb, mbAddrIncrTable[run][1], 
373              mbAddrIncrTable[run][0]);
374 }
375 #endif //CONFIG_ENCODERS
376
377 static void common_init(MpegEncContext *s)
378 {
379
380     s->y_dc_scale_table=
381     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
382
383 }
384
385 void ff_mpeg1_clean_buffers(MpegEncContext *s){
386     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
387     s->last_dc[1] = s->last_dc[0];
388     s->last_dc[2] = s->last_dc[0];
389     memset(s->last_mv, 0, sizeof(s->last_mv));
390 }
391
392 #ifdef CONFIG_ENCODERS
393
394 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
395     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
396     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
397     put_bits(&s->pb, 1, 0); /* slice extra information */
398 }
399
400 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
401 {
402     mpeg1_encode_sequence_header(s);
403
404     /* mpeg1 picture header */
405     put_header(s, PICTURE_START_CODE);
406     /* temporal reference */
407
408     // RAL: s->picture_number instead of s->fake_picture_number
409     put_bits(&s->pb, 10, (s->picture_number - 
410                           s->gop_picture_number) & 0x3ff); 
411     put_bits(&s->pb, 3, s->pict_type);
412
413     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
414     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
415     
416     // RAL: Forward f_code also needed for B frames
417     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
418         put_bits(&s->pb, 1, 0); /* half pel coordinates */
419         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
420             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
421         else
422             put_bits(&s->pb, 3, 7); /* forward_f_code */
423     }
424     
425     // RAL: Backward f_code necessary for B frames
426     if (s->pict_type == B_TYPE) {
427         put_bits(&s->pb, 1, 0); /* half pel coordinates */
428         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
429             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
430         else
431             put_bits(&s->pb, 3, 7); /* backward_f_code */
432     }
433
434     put_bits(&s->pb, 1, 0); /* extra bit picture */
435
436     s->frame_pred_frame_dct = 1;
437     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
438         put_header(s, EXT_START_CODE);
439         put_bits(&s->pb, 4, 8); //pic ext
440         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
441             put_bits(&s->pb, 4, s->f_code);
442             put_bits(&s->pb, 4, s->f_code);
443         }else{
444             put_bits(&s->pb, 8, 255);
445         }
446         if (s->pict_type == B_TYPE) {
447             put_bits(&s->pb, 4, s->b_code);
448             put_bits(&s->pb, 4, s->b_code);
449         }else{
450             put_bits(&s->pb, 8, 255);
451         }
452         put_bits(&s->pb, 2, s->intra_dc_precision);
453         
454         assert(s->picture_structure == PICT_FRAME);
455         put_bits(&s->pb, 2, s->picture_structure);
456         if (s->progressive_sequence) {
457             put_bits(&s->pb, 1, 0); /* no repeat */
458         } else {
459             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
460         }
461         /* XXX: optimize the generation of this flag with entropy
462            measures */
463         s->frame_pred_frame_dct = s->progressive_sequence;
464         
465         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
466         put_bits(&s->pb, 1, s->concealment_motion_vectors);
467         put_bits(&s->pb, 1, s->q_scale_type);
468         put_bits(&s->pb, 1, s->intra_vlc_format);
469         put_bits(&s->pb, 1, s->alternate_scan);
470         put_bits(&s->pb, 1, s->repeat_first_field);
471         put_bits(&s->pb, 1, s->chroma_420_type=1);
472         s->progressive_frame = s->progressive_sequence;
473         put_bits(&s->pb, 1, s->progressive_frame);
474         put_bits(&s->pb, 1, 0); //composite_display_flag
475     }
476     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
477         int i;
478
479         put_header(s, USER_START_CODE);
480         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
481             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
482         }
483     }
484     
485     s->mb_y=0;
486     ff_mpeg1_encode_slice_header(s);
487 }
488
489 static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
490                                 int has_mv, int field_motion)
491 {
492     put_bits(&s->pb, n, bits);
493     if (!s->frame_pred_frame_dct) {
494         if (has_mv) 
495             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
496         put_bits(&s->pb, 1, s->interlaced_dct);
497     }
498 }
499
500 void mpeg1_encode_mb(MpegEncContext *s,
501                      DCTELEM block[6][64],
502                      int motion_x, int motion_y)
503 {
504     int i, cbp;
505     const int mb_x = s->mb_x;
506     const int mb_y = s->mb_y;
507     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
508
509     /* compute cbp */
510     cbp = 0;
511     for(i=0;i<6;i++) {
512         if (s->block_last_index[i] >= 0)
513             cbp |= 1 << (5 - i);
514     }
515     
516     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
517         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
518         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
519         (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) |
520         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
521         s->mb_skip_run++;
522         s->qscale -= s->dquant;
523         s->skip_count++;
524         s->misc_bits++;
525         s->last_bits++;
526         if(s->pict_type == P_TYPE){
527             s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
528             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
529         }
530     } else {
531         if(first_mb){
532             assert(s->mb_skip_run == 0);
533             encode_mb_skip_run(s, s->mb_x);
534         }else{
535             encode_mb_skip_run(s, s->mb_skip_run);
536         }
537         
538         if (s->pict_type == I_TYPE) {
539             if(s->dquant && cbp){
540                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
541                 put_bits(&s->pb, 5, s->qscale);
542             }else{
543                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
544                 s->qscale -= s->dquant;
545             }
546             s->misc_bits+= get_bits_diff(s);
547             s->i_count++;
548         } else if (s->mb_intra) {
549             if(s->dquant && cbp){
550                 put_mb_modes(s, 6, 0x01, 0, 0);
551                 put_bits(&s->pb, 5, s->qscale);
552             }else{
553                 put_mb_modes(s, 5, 0x03, 0, 0);
554                 s->qscale -= s->dquant;
555             }
556             s->misc_bits+= get_bits_diff(s);
557             s->i_count++;
558             memset(s->last_mv, 0, sizeof(s->last_mv));
559         } else if (s->pict_type == P_TYPE) { 
560             if(s->mv_type == MV_TYPE_16X16){
561                 if (cbp != 0) {
562                     if ((motion_x|motion_y) == 0) {
563                         if(s->dquant){
564                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
565                             put_bits(&s->pb, 5, s->qscale);
566                         }else{
567                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
568                         }
569                         s->misc_bits+= get_bits_diff(s);
570                     } else {
571                         if(s->dquant){
572                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
573                             put_bits(&s->pb, 5, s->qscale);
574                         }else{
575                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
576                         }
577                         s->misc_bits+= get_bits_diff(s);
578                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
579                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
580                         s->mv_bits+= get_bits_diff(s);
581                     }
582                 } else {
583                     put_bits(&s->pb, 3, 1); /* motion only */
584                     if (!s->frame_pred_frame_dct)
585                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
586                     s->misc_bits+= get_bits_diff(s);
587                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
588                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
589                     s->qscale -= s->dquant;
590                     s->mv_bits+= get_bits_diff(s);
591                 }
592                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
593                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
594             }else{
595                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
596
597                 if (cbp) {
598                     if(s->dquant){
599                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
600                         put_bits(&s->pb, 5, s->qscale);
601                     }else{
602                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
603                     }
604                 } else {
605                     put_bits(&s->pb, 3, 1); /* motion only */
606                     put_bits(&s->pb, 2, 1); /* motion_type: field */
607                     s->qscale -= s->dquant;
608                 }
609                 s->misc_bits+= get_bits_diff(s);
610                 for(i=0; i<2; i++){
611                     put_bits(&s->pb, 1, s->field_select[0][i]);
612                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
613                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
614                     s->last_mv[0][i][0]=   s->mv[0][i][0];
615                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
616                 }
617                 s->mv_bits+= get_bits_diff(s);
618             }
619             if(cbp)
620                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
621             s->f_count++;
622         } else{  
623             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
624
625             if(s->mv_type == MV_TYPE_16X16){
626                 if (cbp){    // With coded bloc pattern
627                     if (s->dquant) {
628                         if(s->mv_dir == MV_DIR_FORWARD)
629                             put_mb_modes(s, 6, 3, 1, 0);
630                         else
631                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
632                         put_bits(&s->pb, 5, s->qscale);
633                     } else {
634                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
635                     }
636                 }else{    // No coded bloc pattern
637                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
638                     if (!s->frame_pred_frame_dct)
639                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
640                     s->qscale -= s->dquant;
641                 }
642                 s->misc_bits += get_bits_diff(s);
643                 if (s->mv_dir&MV_DIR_FORWARD){
644                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
645                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
646                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
647                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
648                     s->f_count++;
649                 }
650                 if (s->mv_dir&MV_DIR_BACKWARD){
651                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
652                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
653                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
654                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
655                     s->b_count++;
656                 }
657             }else{
658                 assert(s->mv_type == MV_TYPE_FIELD);
659                 assert(!s->frame_pred_frame_dct);
660                 if (cbp){    // With coded bloc pattern
661                     if (s->dquant) {
662                         if(s->mv_dir == MV_DIR_FORWARD)
663                             put_mb_modes(s, 6, 3, 1, 1);
664                         else
665                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
666                         put_bits(&s->pb, 5, s->qscale);
667                     } else {
668                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
669                     }
670                 }else{    // No coded bloc pattern
671                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
672                     put_bits(&s->pb, 2, 1); /* motion_type: field */
673                     s->qscale -= s->dquant;
674                 }
675                 s->misc_bits += get_bits_diff(s);
676                 if (s->mv_dir&MV_DIR_FORWARD){
677                     for(i=0; i<2; i++){
678                         put_bits(&s->pb, 1, s->field_select[0][i]);
679                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
680                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
681                         s->last_mv[0][i][0]=   s->mv[0][i][0];
682                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
683                     }
684                     s->f_count++;
685                 }
686                 if (s->mv_dir&MV_DIR_BACKWARD){
687                     for(i=0; i<2; i++){
688                         put_bits(&s->pb, 1, s->field_select[1][i]);
689                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
690                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
691                         s->last_mv[1][i][0]=   s->mv[1][i][0];
692                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
693                     }
694                     s->b_count++;
695                 }
696             }
697             s->mv_bits += get_bits_diff(s);
698             if(cbp)
699                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
700         }
701         for(i=0;i<6;i++) {
702             if (cbp & (1 << (5 - i))) {
703                 mpeg1_encode_block(s, block[i], i);
704             }
705         }
706         s->mb_skip_run = 0;
707         if(s->mb_intra)
708             s->i_tex_bits+= get_bits_diff(s);
709         else
710             s->p_tex_bits+= get_bits_diff(s);
711     }
712 }
713
714 // RAL: Parameter added: f_or_b_code
715 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
716 {
717     int code, bit_size, l, bits, range, sign;
718
719     if (val == 0) {
720         /* zero vector */
721         code = 0;
722         put_bits(&s->pb,
723                  mbMotionVectorTable[0][1], 
724                  mbMotionVectorTable[0][0]); 
725     } else {
726         bit_size = f_or_b_code - 1;
727         range = 1 << bit_size;
728         /* modulo encoding */
729         l= INT_BIT - 5 - bit_size;
730         val= (val<<l)>>l;
731
732         if (val >= 0) {
733             val--;
734             code = (val >> bit_size) + 1;
735             bits = val & (range - 1);
736             sign = 0;
737         } else {
738             val = -val;
739             val--;
740             code = (val >> bit_size) + 1;
741             bits = val & (range - 1);
742             sign = 1;
743         }
744
745         assert(code > 0 && code <= 16);
746
747         put_bits(&s->pb,
748                  mbMotionVectorTable[code][1], 
749                  mbMotionVectorTable[code][0]); 
750
751         put_bits(&s->pb, 1, sign);
752         if (bit_size > 0) {
753             put_bits(&s->pb, bit_size, bits);
754         }
755     }
756 }
757
758 void ff_mpeg1_encode_init(MpegEncContext *s)
759 {
760     static int done=0;
761
762     common_init(s);
763
764     if(!done){
765         int f_code;
766         int mv;
767         int i;
768
769         done=1;
770         init_rl(&rl_mpeg1, 1);
771
772         for(i=0; i<64; i++)
773         {
774                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
775                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
776         }
777         
778         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
779
780         /* build unified dc encoding tables */
781         for(i=-255; i<256; i++)
782         {
783                 int adiff, index;
784                 int bits, code;
785                 int diff=i;
786
787                 adiff = ABS(diff);
788                 if(diff<0) diff--;
789                 index = av_log2(2*adiff);
790
791                 bits= vlc_dc_lum_bits[index] + index;
792                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
793                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
794                 
795                 bits= vlc_dc_chroma_bits[index] + index;
796                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
797                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
798         }
799
800         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
801
802         for(f_code=1; f_code<=MAX_FCODE; f_code++){
803             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
804                 int len;
805
806                 if(mv==0) len= mbMotionVectorTable[0][1];
807                 else{
808                     int val, bit_size, range, code;
809
810                     bit_size = f_code - 1;
811                     range = 1 << bit_size;
812
813                     val=mv;
814                     if (val < 0) 
815                         val = -val;
816                     val--;
817                     code = (val >> bit_size) + 1;
818                     if(code<17){
819                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
820                     }else{
821                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
822                     }
823                 }
824
825                 mv_penalty[f_code][mv+MAX_MV]= len;
826             }
827         }
828         
829
830         for(f_code=MAX_FCODE; f_code>0; f_code--){
831             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
832                 fcode_tab[mv+MAX_MV]= f_code;
833             }
834         }
835     }
836     s->me.mv_penalty= mv_penalty;
837     s->fcode_tab= fcode_tab;
838     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
839         s->min_qcoeff=-255;
840         s->max_qcoeff= 255;
841     }else{
842         s->min_qcoeff=-2047;
843         s->max_qcoeff= 2047;
844     }
845     s->intra_ac_vlc_length=
846     s->inter_ac_vlc_length=
847     s->intra_ac_vlc_last_length=
848     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
849 }
850
851 static inline void encode_dc(MpegEncContext *s, int diff, int component)
852 {
853   if(((unsigned) (diff+255)) >= 511){
854         int index;
855
856         if(diff<0){
857             index= av_log2_16bit(-2*diff);
858             diff--;
859         }else{
860             index= av_log2_16bit(2*diff);
861         }
862         if (component == 0) {
863             put_bits(
864                 &s->pb, 
865                 vlc_dc_lum_bits[index] + index,
866                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
867         }else{
868             put_bits(
869                 &s->pb, 
870                 vlc_dc_chroma_bits[index] + index,
871                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
872         }
873   }else{
874     if (component == 0) {
875         put_bits(
876             &s->pb, 
877             mpeg1_lum_dc_uni[diff+255]&0xFF,
878             mpeg1_lum_dc_uni[diff+255]>>8);
879     } else {
880         put_bits(
881             &s->pb, 
882             mpeg1_chr_dc_uni[diff+255]&0xFF,
883             mpeg1_chr_dc_uni[diff+255]>>8);
884     }
885   }
886 }
887
888 static void mpeg1_encode_block(MpegEncContext *s, 
889                                DCTELEM *block, 
890                                int n)
891 {
892     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
893     int code, component;
894 //    RLTable *rl = &rl_mpeg1;
895
896     last_index = s->block_last_index[n];
897
898     /* DC coef */
899     if (s->mb_intra) {
900         component = (n <= 3 ? 0 : n - 4 + 1);
901         dc = block[0]; /* overflow is impossible */
902         diff = dc - s->last_dc[component];
903         encode_dc(s, diff, component);
904         s->last_dc[component] = dc;
905         i = 1;
906 /*
907         if (s->intra_vlc_format)
908             rl = &rl_mpeg2;
909         else
910             rl = &rl_mpeg1;
911 */
912     } else {
913         /* encode the first coefficient : needs to be done here because
914            it is handled slightly differently */
915         level = block[0];
916         if (abs(level) == 1) {
917                 code = ((uint32_t)level >> 31); /* the sign bit */
918                 put_bits(&s->pb, 2, code | 0x02);
919                 i = 1;
920         } else {
921             i = 0;
922             last_non_zero = -1;
923             goto next_coef;
924         }
925     }
926
927     /* now quantify & encode AC coefs */
928     last_non_zero = i - 1;
929
930     for(;i<=last_index;i++) {
931         j = s->intra_scantable.permutated[i];
932         level = block[j];
933     next_coef:
934 #if 0
935         if (level != 0)
936             dprintf("level[%d]=%d\n", i, level);
937 #endif            
938         /* encode using VLC */
939         if (level != 0) {
940             run = i - last_non_zero - 1;
941             
942             alevel= level;
943             MASK_ABS(sign, alevel)
944             sign&=1;
945
946 //            code = get_rl_index(rl, 0, run, alevel);
947             if (alevel <= mpeg1_max_level[0][run]){
948                 code= mpeg1_index_run[0][run] + alevel - 1;
949                 /* store the vlc & sign at once */
950                 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
951             } else {
952                 /* escape seems to be pretty rare <5% so i dont optimize it */
953                 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
954                 /* escape: only clip in this case */
955                 put_bits(&s->pb, 6, run);
956                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
957                     if (alevel < 128) {
958                         put_bits(&s->pb, 8, level & 0xff);
959                     } else {
960                         if (level < 0) {
961                             put_bits(&s->pb, 16, 0x8001 + level + 255);
962                         } else {
963                             put_bits(&s->pb, 16, level & 0xffff);
964                         }
965                     }
966                 }else{
967                     put_bits(&s->pb, 12, level & 0xfff);
968                 }
969             }
970             last_non_zero = i;
971         }
972     }
973     /* end of block */
974     put_bits(&s->pb, 2, 0x2);
975 }
976 #endif //CONFIG_ENCODERS
977
978 /******************************************/
979 /* decoding */
980
981 static VLC dc_lum_vlc;
982 static VLC dc_chroma_vlc;
983 static VLC mv_vlc;
984 static VLC mbincr_vlc;
985 static VLC mb_ptype_vlc;
986 static VLC mb_btype_vlc;
987 static VLC mb_pat_vlc;
988
989 static void init_vlcs(void)
990 {
991     static int done = 0;
992
993     if (!done) {
994         done = 1;
995
996         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
997                  vlc_dc_lum_bits, 1, 1,
998                  vlc_dc_lum_code, 2, 2, 1);
999         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
1000                  vlc_dc_chroma_bits, 1, 1,
1001                  vlc_dc_chroma_code, 2, 2, 1);
1002         init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
1003                  &mbMotionVectorTable[0][1], 2, 1,
1004                  &mbMotionVectorTable[0][0], 2, 1, 1);
1005         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
1006                  &mbAddrIncrTable[0][1], 2, 1,
1007                  &mbAddrIncrTable[0][0], 2, 1, 1);
1008         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1009                  &mbPatTable[0][1], 2, 1,
1010                  &mbPatTable[0][0], 2, 1, 1);
1011         
1012         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
1013                  &table_mb_ptype[0][1], 2, 1,
1014                  &table_mb_ptype[0][0], 2, 1, 1);
1015         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
1016                  &table_mb_btype[0][1], 2, 1,
1017                  &table_mb_btype[0][0], 2, 1, 1);
1018         init_rl(&rl_mpeg1, 1);
1019         init_rl(&rl_mpeg2, 1);
1020
1021         init_2d_vlc_rl(&rl_mpeg1, 1);
1022         init_2d_vlc_rl(&rl_mpeg2, 1);
1023     }
1024 }
1025
1026 static inline int get_dmv(MpegEncContext *s)
1027 {
1028     if(get_bits1(&s->gb)) 
1029         return 1 - (get_bits1(&s->gb) << 1);
1030     else
1031         return 0;
1032 }
1033
1034 static inline int get_qscale(MpegEncContext *s)
1035 {
1036     int qscale = get_bits(&s->gb, 5);
1037     if (s->q_scale_type) {
1038         return non_linear_qscale[qscale];
1039     } else {
1040         return qscale << 1;
1041     }
1042 }
1043
1044 /* motion type (for mpeg2) */
1045 #define MT_FIELD 1
1046 #define MT_FRAME 2
1047 #define MT_16X8  2
1048 #define MT_DMV   3
1049
1050 static int mpeg_decode_mb(MpegEncContext *s,
1051                           DCTELEM block[12][64])
1052 {
1053     int i, j, k, cbp, val, mb_type, motion_type;
1054     const int mb_block_count = 4 + (1<< s->chroma_format);
1055
1056     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1057
1058     assert(s->mb_skipped==0);
1059
1060     if (s->mb_skip_run-- != 0) {
1061         if(s->pict_type == I_TYPE){
1062             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1063             return -1;
1064         }
1065     
1066         /* skip mb */
1067         s->mb_intra = 0;
1068         for(i=0;i<12;i++)
1069             s->block_last_index[i] = -1;
1070         if(s->picture_structure == PICT_FRAME)
1071             s->mv_type = MV_TYPE_16X16;
1072         else
1073             s->mv_type = MV_TYPE_FIELD;
1074         if (s->pict_type == P_TYPE) {
1075             /* if P type, zero motion vector is implied */
1076             s->mv_dir = MV_DIR_FORWARD;
1077             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1078             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1079             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1080             s->field_select[0][0]= s->picture_structure - 1;
1081             s->mb_skipped = 1;
1082             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1083         } else {
1084             int mb_type;
1085             
1086             if(s->mb_x)
1087                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1088             else
1089                 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, 
1090             if(IS_INTRA(mb_type))
1091                 return -1;
1092             
1093             /* if B type, reuse previous vectors and directions */
1094             s->mv[0][0][0] = s->last_mv[0][0][0];
1095             s->mv[0][0][1] = s->last_mv[0][0][1];
1096             s->mv[1][0][0] = s->last_mv[1][0][0];
1097             s->mv[1][0][1] = s->last_mv[1][0][1];
1098
1099             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1100                 mb_type | MB_TYPE_SKIP;
1101 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1102
1103             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1104                 s->mb_skipped = 1;
1105         }
1106
1107         return 0;
1108     }
1109
1110     switch(s->pict_type) {
1111     default:
1112     case I_TYPE:
1113         if (get_bits1(&s->gb) == 0) {
1114             if (get_bits1(&s->gb) == 0){
1115                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1116                 return -1;
1117             }
1118             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1119         } else {
1120             mb_type = MB_TYPE_INTRA;
1121         }
1122         break;
1123     case P_TYPE:
1124         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1125         if (mb_type < 0){
1126             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1127             return -1;
1128         }
1129         mb_type = ptype2mb_type[ mb_type ];
1130         break;
1131     case B_TYPE:
1132         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1133         if (mb_type < 0){
1134             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1135             return -1;
1136         }
1137         mb_type = btype2mb_type[ mb_type ];
1138         break;
1139     }
1140     dprintf("mb_type=%x\n", mb_type);
1141 //    motion_type = 0; /* avoid warning */
1142     if (IS_INTRA(mb_type)) {
1143         s->dsp.clear_blocks(s->block[0]);
1144     
1145         if(!s->chroma_y_shift){
1146             s->dsp.clear_blocks(s->block[6]);
1147         }
1148     
1149         /* compute dct type */
1150         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1151             !s->frame_pred_frame_dct) {
1152             s->interlaced_dct = get_bits1(&s->gb);
1153         }
1154
1155         if (IS_QUANT(mb_type))
1156             s->qscale = get_qscale(s);
1157         
1158         if (s->concealment_motion_vectors) {
1159             /* just parse them */
1160             if (s->picture_structure != PICT_FRAME) 
1161                 skip_bits1(&s->gb); /* field select */
1162             
1163             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1164                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1165             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1166                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1167
1168             skip_bits1(&s->gb); /* marker */
1169         }else
1170             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1171         s->mb_intra = 1;
1172 #ifdef HAVE_XVMC
1173         //one 1 we memcpy blocks in xvmcvideo
1174         if(s->avctx->xvmc_acceleration > 1){
1175             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1176             if(s->swap_uv){
1177                 exchange_uv(s);
1178             }
1179         }
1180 #endif
1181
1182         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1183             if(s->flags2 & CODEC_FLAG2_FAST){
1184                 for(i=0;i<6;i++) {
1185                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1186                 }
1187             }else{
1188                 for(i=0;i<mb_block_count;i++) {
1189                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1190                         return -1;
1191                 }
1192             }
1193         } else {
1194             for(i=0;i<6;i++) {
1195                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1196                     return -1;
1197             }
1198         }
1199     } else {
1200         if (mb_type & MB_TYPE_ZERO_MV){
1201             assert(mb_type & MB_TYPE_CBP);
1202
1203             /* compute dct type */
1204             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1205                 !s->frame_pred_frame_dct) {
1206                 s->interlaced_dct = get_bits1(&s->gb);
1207             }
1208
1209             if (IS_QUANT(mb_type))
1210                 s->qscale = get_qscale(s);
1211
1212             s->mv_dir = MV_DIR_FORWARD;
1213             if(s->picture_structure == PICT_FRAME)
1214                 s->mv_type = MV_TYPE_16X16;
1215             else{
1216                 s->mv_type = MV_TYPE_FIELD;
1217                 mb_type |= MB_TYPE_INTERLACED;
1218                 s->field_select[0][0]= s->picture_structure - 1;
1219             }
1220             s->last_mv[0][0][0] = 0;
1221             s->last_mv[0][0][1] = 0;
1222             s->last_mv[0][1][0] = 0;
1223             s->last_mv[0][1][1] = 0;
1224             s->mv[0][0][0] = 0;
1225             s->mv[0][0][1] = 0;
1226         }else{
1227             assert(mb_type & MB_TYPE_L0L1);
1228 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1229             /* get additionnal motion vector type */
1230             if (s->frame_pred_frame_dct) 
1231                 motion_type = MT_FRAME;
1232             else{
1233                 motion_type = get_bits(&s->gb, 2);
1234             }
1235
1236             /* compute dct type */
1237             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1238                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1239                 s->interlaced_dct = get_bits1(&s->gb);
1240             }
1241
1242             if (IS_QUANT(mb_type))
1243                 s->qscale = get_qscale(s);
1244
1245             /* motion vectors */
1246             s->mv_dir = 0;
1247             for(i=0;i<2;i++) {
1248                 if (USES_LIST(mb_type, i)) {
1249                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1250                     dprintf("motion_type=%d\n", motion_type);
1251                     switch(motion_type) {
1252                     case MT_FRAME: /* or MT_16X8 */
1253                         if (s->picture_structure == PICT_FRAME) {
1254                             /* MT_FRAME */
1255                             mb_type |= MB_TYPE_16x16; 
1256                             s->mv_type = MV_TYPE_16X16;
1257                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1258                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1259                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1260                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1261                             /* full_pel: only for mpeg1 */
1262                             if (s->full_pel[i]){
1263                                 s->mv[i][0][0] <<= 1;
1264                                 s->mv[i][0][1] <<= 1;
1265                             }
1266                         } else {
1267                             /* MT_16X8 */
1268                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1269                             s->mv_type = MV_TYPE_16X8;
1270                             for(j=0;j<2;j++) {
1271                                 s->field_select[i][j] = get_bits1(&s->gb);
1272                                 for(k=0;k<2;k++) {
1273                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1274                                                              s->last_mv[i][j][k]);
1275                                     s->last_mv[i][j][k] = val;
1276                                     s->mv[i][j][k] = val;
1277                                 }
1278                             }
1279                         }
1280                         break;
1281                     case MT_FIELD:
1282                         s->mv_type = MV_TYPE_FIELD;
1283                         if (s->picture_structure == PICT_FRAME) {
1284                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1285                             for(j=0;j<2;j++) {
1286                                 s->field_select[i][j] = get_bits1(&s->gb);
1287                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1288                                                          s->last_mv[i][j][0]);
1289                                 s->last_mv[i][j][0] = val;
1290                                 s->mv[i][j][0] = val;
1291                                 dprintf("fmx=%d\n", val);
1292                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1293                                                          s->last_mv[i][j][1] >> 1);
1294                                 s->last_mv[i][j][1] = val << 1;
1295                                 s->mv[i][j][1] = val;
1296                                 dprintf("fmy=%d\n", val);
1297                             }
1298                         } else {
1299                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1300                             s->field_select[i][0] = get_bits1(&s->gb);
1301                             for(k=0;k<2;k++) {
1302                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1303                                                          s->last_mv[i][0][k]);
1304                                 s->last_mv[i][0][k] = val;
1305                                 s->last_mv[i][1][k] = val;
1306                                 s->mv[i][0][k] = val;
1307                             }
1308                         }
1309                         break;
1310                     case MT_DMV:
1311                         {
1312                             int dmx, dmy, mx, my, m;
1313
1314                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1315                                                     s->last_mv[i][0][0]);
1316                             s->last_mv[i][0][0] = mx;
1317                             s->last_mv[i][1][0] = mx;
1318                             dmx = get_dmv(s);
1319                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1320                                                     s->last_mv[i][0][1] >> 1);
1321                             dmy = get_dmv(s);
1322                             s->mv_type = MV_TYPE_DMV;
1323
1324
1325                             s->last_mv[i][0][1] = my<<1;
1326                             s->last_mv[i][1][1] = my<<1;
1327
1328                             s->mv[i][0][0] = mx;
1329                             s->mv[i][0][1] = my;
1330                             s->mv[i][1][0] = mx;//not used
1331                             s->mv[i][1][1] = my;//not used
1332
1333                             if (s->picture_structure == PICT_FRAME) {
1334                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1335
1336                                 //m = 1 + 2 * s->top_field_first;
1337                                 m = s->top_field_first ? 1 : 3;
1338
1339                                 /* top -> top pred */
1340                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1341                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1342                                 m = 4 - m;
1343                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1344                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1345                             } else {
1346                                 mb_type |= MB_TYPE_16x16;
1347
1348                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1349                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1350                                 if(s->picture_structure == PICT_TOP_FIELD)
1351                                     s->mv[i][2][1]--;
1352                                 else 
1353                                     s->mv[i][2][1]++;
1354                             }
1355                         }
1356                         break;
1357                     default:
1358                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1359                         return -1;
1360                     }
1361                 }
1362             }
1363         }
1364         
1365         s->mb_intra = 0;
1366         if (HAS_CBP(mb_type)) {
1367             s->dsp.clear_blocks(s->block[0]);
1368         
1369             if(!s->chroma_y_shift){
1370                 s->dsp.clear_blocks(s->block[6]);
1371             }
1372
1373             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1374             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1375                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1376                 return -1;
1377             }
1378             if(mb_block_count > 6){
1379                  cbp<<= mb_block_count-6;
1380                  cbp |= get_bits(&s->gb, mb_block_count-6);
1381             }
1382
1383 #ifdef HAVE_XVMC
1384             //on 1 we memcpy blocks in xvmcvideo
1385             if(s->avctx->xvmc_acceleration > 1){
1386                 XVMC_pack_pblocks(s,cbp);
1387                 if(s->swap_uv){
1388                     exchange_uv(s);
1389                 }
1390             }    
1391 #endif
1392
1393             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1394                 if(s->flags2 & CODEC_FLAG2_FAST){
1395                     for(i=0;i<6;i++) {
1396                         if(cbp & 32) {
1397                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1398                         } else {
1399                             s->block_last_index[i] = -1;
1400                         }
1401                         cbp+=cbp;
1402                     }
1403                 }else{
1404                     cbp<<= 12-mb_block_count;
1405     
1406                     for(i=0;i<mb_block_count;i++) {
1407                         if ( cbp & (1<<11) ) {
1408                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1409                                 return -1;
1410                         } else {
1411                             s->block_last_index[i] = -1;
1412                         }
1413                         cbp+=cbp;
1414                     }
1415                 }
1416             } else {
1417                 if(s->flags2 & CODEC_FLAG2_FAST){
1418                     for(i=0;i<6;i++) {
1419                         if (cbp & 32) {
1420                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1421                         } else {
1422                             s->block_last_index[i] = -1;
1423                         }
1424                         cbp+=cbp;
1425                     }
1426                 }else{
1427                     for(i=0;i<6;i++) {
1428                         if (cbp & 32) {
1429                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1430                                 return -1;
1431                         } else {
1432                             s->block_last_index[i] = -1;
1433                         }
1434                         cbp+=cbp;
1435                     }
1436                 }
1437             }
1438         }else{
1439             for(i=0;i<6;i++)
1440                 s->block_last_index[i] = -1;
1441         }
1442     }
1443
1444     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1445
1446     return 0;
1447 }
1448
1449 /* as h263, but only 17 codes */
1450 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1451 {
1452     int code, sign, val, l, shift;
1453
1454     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1455     if (code == 0) {
1456         return pred;
1457     }
1458     if (code < 0) {
1459         return 0xffff;
1460     }
1461
1462     sign = get_bits1(&s->gb);
1463     shift = fcode - 1;
1464     val = code;
1465     if (shift) {
1466         val = (val - 1) << shift;
1467         val |= get_bits(&s->gb, shift);
1468         val++;
1469     }
1470     if (sign)
1471         val = -val;
1472     val += pred;
1473     
1474     /* modulo decoding */
1475     l= INT_BIT - 5 - shift;
1476     val = (val<<l)>>l;
1477     return val;
1478 }
1479
1480 static inline int decode_dc(GetBitContext *gb, int component)
1481 {
1482     int code, diff;
1483
1484     if (component == 0) {
1485         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1486     } else {
1487         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1488     }
1489     if (code < 0){
1490         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1491         return 0xffff;
1492     }
1493     if (code == 0) {
1494         diff = 0;
1495     } else {
1496         diff = get_xbits(gb, code);
1497     }
1498     return diff;
1499 }
1500
1501 static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1502                                DCTELEM *block, 
1503                                int n)
1504 {
1505     int level, dc, diff, i, j, run;
1506     int component;
1507     RLTable *rl = &rl_mpeg1;
1508     uint8_t * const scantable= s->intra_scantable.permutated;
1509     const uint16_t *quant_matrix= s->intra_matrix;
1510     const int qscale= s->qscale;
1511
1512     /* DC coef */
1513     component = (n <= 3 ? 0 : n - 4 + 1);
1514     diff = decode_dc(&s->gb, component);
1515     if (diff >= 0xffff)
1516         return -1;
1517     dc = s->last_dc[component];
1518     dc += diff;
1519     s->last_dc[component] = dc;
1520     block[0] = dc<<3;
1521     dprintf("dc=%d diff=%d\n", dc, diff);
1522     i = 0;
1523     {
1524         OPEN_READER(re, &s->gb);    
1525         /* now quantify & encode AC coefs */
1526         for(;;) {
1527             UPDATE_CACHE(re, &s->gb);
1528             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1529             
1530             if(level == 127){
1531                 break;
1532             } else if(level != 0) {
1533                 i += run;
1534                 j = scantable[i];
1535                 level= (level*qscale*quant_matrix[j])>>4;
1536                 level= (level-1)|1;
1537                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1538                 LAST_SKIP_BITS(re, &s->gb, 1);
1539             } else {
1540                 /* escape */
1541                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1542                 UPDATE_CACHE(re, &s->gb);
1543                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1544                 if (level == -128) {
1545                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1546                 } else if (level == 0) {
1547                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1548                 }
1549                 i += run;
1550                 j = scantable[i];
1551                 if(level<0){
1552                     level= -level;
1553                     level= (level*qscale*quant_matrix[j])>>4;
1554                     level= (level-1)|1;
1555                     level= -level;
1556                 }else{
1557                     level= (level*qscale*quant_matrix[j])>>4;
1558                     level= (level-1)|1;
1559                 }
1560             }
1561             if (i > 63){
1562                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1563                 return -1;
1564             }
1565
1566             block[j] = level;
1567         }
1568         CLOSE_READER(re, &s->gb);
1569     }
1570     s->block_last_index[n] = i;
1571    return 0;
1572 }
1573
1574 static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1575                                DCTELEM *block, 
1576                                int n)
1577 {
1578     int level, i, j, run;
1579     RLTable *rl = &rl_mpeg1;
1580     uint8_t * const scantable= s->intra_scantable.permutated;
1581     const uint16_t *quant_matrix= s->inter_matrix;
1582     const int qscale= s->qscale;
1583
1584     {
1585         OPEN_READER(re, &s->gb);
1586         i = -1;
1587         /* special case for the first coef. no need to add a second vlc table */
1588         UPDATE_CACHE(re, &s->gb);
1589         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1590             level= (3*qscale*quant_matrix[0])>>5;
1591             level= (level-1)|1;
1592             if(GET_CACHE(re, &s->gb)&0x40000000)
1593                 level= -level;
1594             block[0] = level;
1595             i++;
1596             SKIP_BITS(re, &s->gb, 2);
1597             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1598                 goto end;
1599         }
1600
1601         /* now quantify & encode AC coefs */
1602         for(;;) {
1603             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1604             
1605             if(level != 0) {
1606                 i += run;
1607                 j = scantable[i];
1608                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1609                 level= (level-1)|1;
1610                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1611                 SKIP_BITS(re, &s->gb, 1);
1612             } else {
1613                 /* escape */
1614                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1615                 UPDATE_CACHE(re, &s->gb);
1616                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1617                 if (level == -128) {
1618                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1619                 } else if (level == 0) {
1620                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1621                 }
1622                 i += run;
1623                 j = scantable[i];
1624                 if(level<0){
1625                     level= -level;
1626                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1627                     level= (level-1)|1;
1628                     level= -level;
1629                 }else{
1630                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1631                     level= (level-1)|1;
1632                 }
1633             }
1634             if (i > 63){
1635                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1636                 return -1;
1637             }
1638
1639             block[j] = level;
1640             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1641                 break;
1642             UPDATE_CACHE(re, &s->gb);
1643         }
1644 end:
1645         LAST_SKIP_BITS(re, &s->gb, 2);
1646         CLOSE_READER(re, &s->gb);
1647     }
1648     s->block_last_index[n] = i;
1649     return 0;
1650 }
1651
1652 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1653 {
1654     int level, i, j, run;
1655     RLTable *rl = &rl_mpeg1;
1656     uint8_t * const scantable= s->intra_scantable.permutated;
1657     const int qscale= s->qscale;
1658
1659     {
1660         OPEN_READER(re, &s->gb);
1661         i = -1;
1662         /* special case for the first coef. no need to add a second vlc table */
1663         UPDATE_CACHE(re, &s->gb);
1664         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1665             level= (3*qscale)>>1;
1666             level= (level-1)|1;
1667             if(GET_CACHE(re, &s->gb)&0x40000000)
1668                 level= -level;
1669             block[0] = level;
1670             i++;
1671             SKIP_BITS(re, &s->gb, 2);
1672             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1673                 goto end;
1674         }
1675
1676         /* now quantify & encode AC coefs */
1677         for(;;) {
1678             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1679             
1680             if(level != 0) {
1681                 i += run;
1682                 j = scantable[i];
1683                 level= ((level*2+1)*qscale)>>1;
1684                 level= (level-1)|1;
1685                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1686                 SKIP_BITS(re, &s->gb, 1);
1687             } else {
1688                 /* escape */
1689                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1690                 UPDATE_CACHE(re, &s->gb);
1691                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1692                 if (level == -128) {
1693                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1694                 } else if (level == 0) {
1695                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1696                 }
1697                 i += run;
1698                 j = scantable[i];
1699                 if(level<0){
1700                     level= -level;
1701                     level= ((level*2+1)*qscale)>>1;
1702                     level= (level-1)|1;
1703                     level= -level;
1704                 }else{
1705                     level= ((level*2+1)*qscale)>>1;
1706                     level= (level-1)|1;
1707                 }
1708             }
1709
1710             block[j] = level;
1711             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1712                 break;
1713             UPDATE_CACHE(re, &s->gb);
1714         }
1715 end:
1716         LAST_SKIP_BITS(re, &s->gb, 2);
1717         CLOSE_READER(re, &s->gb);
1718     }
1719     s->block_last_index[n] = i;
1720     return 0;
1721 }
1722
1723
1724 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1725                                DCTELEM *block, 
1726                                int n)
1727 {
1728     int level, i, j, run;
1729     RLTable *rl = &rl_mpeg1;
1730     uint8_t * const scantable= s->intra_scantable.permutated;
1731     const uint16_t *quant_matrix;
1732     const int qscale= s->qscale;
1733     int mismatch;
1734
1735     mismatch = 1;
1736
1737     {
1738         OPEN_READER(re, &s->gb);
1739         i = -1;
1740         if (n < 4)
1741             quant_matrix = s->inter_matrix;
1742         else
1743             quant_matrix = s->chroma_inter_matrix;
1744
1745         /* special case for the first coef. no need to add a second vlc table */
1746         UPDATE_CACHE(re, &s->gb);
1747         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1748             level= (3*qscale*quant_matrix[0])>>5;
1749             if(GET_CACHE(re, &s->gb)&0x40000000)
1750                 level= -level;
1751             block[0] = level;
1752             mismatch ^= level;
1753             i++;
1754             SKIP_BITS(re, &s->gb, 2);
1755             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1756                 goto end;
1757         }
1758
1759         /* now quantify & encode AC coefs */
1760         for(;;) {
1761             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1762             
1763             if(level != 0) {
1764                 i += run;
1765                 j = scantable[i];
1766                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1767                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1768                 SKIP_BITS(re, &s->gb, 1);
1769             } else {
1770                 /* escape */
1771                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1772                 UPDATE_CACHE(re, &s->gb);
1773                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1774
1775                 i += run;
1776                 j = scantable[i];
1777                 if(level<0){
1778                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1779                     level= -level;
1780                 }else{
1781                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1782                 }
1783             }
1784             if (i > 63){
1785                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1786                 return -1;
1787             }
1788             
1789             mismatch ^= level;
1790             block[j] = level;
1791             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1792                 break;
1793             UPDATE_CACHE(re, &s->gb);
1794         }
1795 end:
1796         LAST_SKIP_BITS(re, &s->gb, 2);
1797         CLOSE_READER(re, &s->gb);
1798     }
1799     block[63] ^= (mismatch & 1);
1800     
1801     s->block_last_index[n] = i;
1802     return 0;
1803 }
1804
1805 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, 
1806                                DCTELEM *block, 
1807                                int n)
1808 {
1809     int level, i, j, run;
1810     RLTable *rl = &rl_mpeg1;
1811     uint8_t * const scantable= s->intra_scantable.permutated;
1812     const int qscale= s->qscale;
1813     int v;
1814     OPEN_READER(re, &s->gb);
1815     i = -1;
1816
1817     /* special case for the first coef. no need to add a second vlc table */
1818     UPDATE_CACHE(re, &s->gb);
1819     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1820         level= (3*qscale)>>1;
1821         if(GET_CACHE(re, &s->gb)&0x40000000)
1822             level= -level;
1823         block[0] = level;
1824         i++;
1825         SKIP_BITS(re, &s->gb, 2);
1826         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1827             goto end;
1828     }
1829
1830     /* now quantify & encode AC coefs */
1831     for(;;) {
1832         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1833         
1834         if(level != 0) {
1835             i += run;
1836             j = scantable[i];
1837             level= ((level*2+1)*qscale)>>1;
1838             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1839             SKIP_BITS(re, &s->gb, 1);
1840         } else {
1841             /* escape */
1842             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1843             UPDATE_CACHE(re, &s->gb);
1844             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1845
1846             i += run;
1847             j = scantable[i];
1848             if(level<0){
1849                 level= ((-level*2+1)*qscale)>>1;
1850                 level= -level;
1851             }else{
1852                 level= ((level*2+1)*qscale)>>1;
1853             }
1854         }
1855         
1856         block[j] = level;
1857         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1858             break;
1859         UPDATE_CACHE(re, &s->gb);
1860     }
1861 end:
1862     LAST_SKIP_BITS(re, &s->gb, 2);    
1863     CLOSE_READER(re, &s->gb);
1864     s->block_last_index[n] = i;
1865     return 0;
1866 }
1867
1868
1869 static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1870                                DCTELEM *block, 
1871                                int n)
1872 {
1873     int level, dc, diff, i, j, run;
1874     int component;
1875     RLTable *rl;
1876     uint8_t * const scantable= s->intra_scantable.permutated;
1877     const uint16_t *quant_matrix;
1878     const int qscale= s->qscale;
1879     int mismatch;
1880
1881     /* DC coef */
1882     if (n < 4){
1883         quant_matrix = s->intra_matrix;
1884         component = 0; 
1885     }else{
1886         quant_matrix = s->chroma_intra_matrix;
1887         component = (n&1) + 1;
1888     }
1889     diff = decode_dc(&s->gb, component);
1890     if (diff >= 0xffff)
1891         return -1;
1892     dc = s->last_dc[component];
1893     dc += diff;
1894     s->last_dc[component] = dc;
1895     block[0] = dc << (3 - s->intra_dc_precision);
1896     dprintf("dc=%d\n", block[0]);
1897     mismatch = block[0] ^ 1;
1898     i = 0;
1899     if (s->intra_vlc_format)
1900         rl = &rl_mpeg2;
1901     else
1902         rl = &rl_mpeg1;
1903
1904     {
1905         OPEN_READER(re, &s->gb);    
1906         /* now quantify & encode AC coefs */
1907         for(;;) {
1908             UPDATE_CACHE(re, &s->gb);
1909             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1910             
1911             if(level == 127){
1912                 break;
1913             } else if(level != 0) {
1914                 i += run;
1915                 j = scantable[i];
1916                 level= (level*qscale*quant_matrix[j])>>4;
1917                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1918                 LAST_SKIP_BITS(re, &s->gb, 1);
1919             } else {
1920                 /* escape */
1921                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1922                 UPDATE_CACHE(re, &s->gb);
1923                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1924                 i += run;
1925                 j = scantable[i];
1926                 if(level<0){
1927                     level= (-level*qscale*quant_matrix[j])>>4;
1928                     level= -level;
1929                 }else{
1930                     level= (level*qscale*quant_matrix[j])>>4;
1931                 }
1932             }
1933             if (i > 63){
1934                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1935                 return -1;
1936             }
1937             
1938             mismatch^= level;
1939             block[j] = level;
1940         }
1941         CLOSE_READER(re, &s->gb);
1942     }
1943     block[63]^= mismatch&1;
1944     
1945     s->block_last_index[n] = i;
1946     return 0;
1947 }
1948
1949 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, 
1950                                DCTELEM *block, 
1951                                int n)
1952 {
1953     int level, dc, diff, j, run;
1954     int component;
1955     RLTable *rl;
1956     uint8_t * scantable= s->intra_scantable.permutated;
1957     const uint16_t *quant_matrix;
1958     const int qscale= s->qscale;
1959
1960     /* DC coef */
1961     if (n < 4){
1962         quant_matrix = s->intra_matrix;
1963         component = 0; 
1964     }else{
1965         quant_matrix = s->chroma_intra_matrix;
1966         component = (n&1) + 1;
1967     }
1968     diff = decode_dc(&s->gb, component);
1969     if (diff >= 0xffff)
1970         return -1;
1971     dc = s->last_dc[component];
1972     dc += diff;
1973     s->last_dc[component] = dc;
1974     block[0] = dc << (3 - s->intra_dc_precision);
1975     if (s->intra_vlc_format)
1976         rl = &rl_mpeg2;
1977     else
1978         rl = &rl_mpeg1;
1979
1980     {
1981         OPEN_READER(re, &s->gb);    
1982         /* now quantify & encode AC coefs */
1983         for(;;) {
1984             UPDATE_CACHE(re, &s->gb);
1985             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1986             
1987             if(level == 127){
1988                 break;
1989             } else if(level != 0) {
1990                 scantable += run;
1991                 j = *scantable;
1992                 level= (level*qscale*quant_matrix[j])>>4;
1993                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1994                 LAST_SKIP_BITS(re, &s->gb, 1);
1995             } else {
1996                 /* escape */
1997                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1998                 UPDATE_CACHE(re, &s->gb);
1999                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2000                 scantable += run;
2001                 j = *scantable;
2002                 if(level<0){
2003                     level= (-level*qscale*quant_matrix[j])>>4;
2004                     level= -level;
2005                 }else{
2006                     level= (level*qscale*quant_matrix[j])>>4;
2007                 }
2008             }
2009             
2010             block[j] = level;
2011         }
2012         CLOSE_READER(re, &s->gb);
2013     }
2014     
2015     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2016     return 0;
2017 }
2018
2019 typedef struct Mpeg1Context {
2020     MpegEncContext mpeg_enc_ctx;
2021     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2022     int repeat_field; /* true if we must repeat the field */
2023     AVPanScan pan_scan; /** some temporary storage for the panscan */
2024     int slice_count;
2025     int swap_uv;//indicate VCR2
2026     int save_aspect_info;
2027     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2028
2029 } Mpeg1Context;
2030
2031 static int mpeg_decode_init(AVCodecContext *avctx)
2032 {
2033     Mpeg1Context *s = avctx->priv_data;
2034     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2035     int i;
2036     
2037     //we need some parmutation to store
2038     //matrixes, until MPV_common_init()
2039     //set the real permutatuon 
2040     for(i=0;i<64;i++)
2041        s2->dsp.idct_permutation[i]=i;
2042
2043     MPV_decode_defaults(s2);
2044     
2045     s->mpeg_enc_ctx.avctx= avctx;
2046     s->mpeg_enc_ctx.flags= avctx->flags;
2047     s->mpeg_enc_ctx.flags2= avctx->flags2;
2048     common_init(&s->mpeg_enc_ctx);
2049     init_vlcs();
2050
2051     s->mpeg_enc_ctx_allocated = 0;
2052     s->mpeg_enc_ctx.picture_number = 0;
2053     s->repeat_field = 0;
2054     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2055     return 0;
2056 }
2057
2058 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, 
2059                                      const uint8_t *new_perm){
2060     uint16_t temp_matrix[64];
2061     int i;
2062
2063     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2064     
2065     for(i=0;i<64;i++){
2066         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2067     }      
2068 }
2069
2070 //Call this function when we know all parameters
2071 //it may be called in different places for mpeg1 and mpeg2
2072 static int mpeg_decode_postinit(AVCodecContext *avctx){
2073     Mpeg1Context *s1 = avctx->priv_data;
2074     MpegEncContext *s = &s1->mpeg_enc_ctx;
2075     uint8_t old_permutation[64];
2076
2077     if (
2078         (s1->mpeg_enc_ctx_allocated == 0)|| 
2079         avctx->coded_width  != s->width ||
2080         avctx->coded_height != s->height||
2081         s1->save_aspect_info != s->aspect_ratio_info||
2082         0)
2083     {
2084     
2085         if (s1->mpeg_enc_ctx_allocated) {
2086             MPV_common_end(s);
2087         }
2088
2089         if( (s->width == 0 )||(s->height == 0))
2090             return -2;
2091
2092         avcodec_set_dimensions(avctx, s->width, s->height);
2093         avctx->bit_rate = s->bit_rate;
2094         s1->save_aspect_info = s->aspect_ratio_info;
2095
2096      //low_delay may be forced, in this case we will have B frames
2097      //that behave like P frames
2098         avctx->has_b_frames = !(s->low_delay);
2099
2100         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2101             //mpeg1 fps
2102             avctx->time_base.den     = frame_rate_tab[s->frame_rate_index].num;
2103             avctx->time_base.num= frame_rate_tab[s->frame_rate_index].den;
2104             //mpeg1 aspect
2105             avctx->sample_aspect_ratio= av_d2q(
2106                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2107
2108         }else{//mpeg2
2109         //mpeg2 fps
2110             av_reduce(
2111                 &s->avctx->time_base.den, 
2112                 &s->avctx->time_base.num, 
2113                 frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2114                 frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2115                 1<<30);
2116         //mpeg2 aspect
2117             if(s->aspect_ratio_info > 1){
2118                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2119                     s->avctx->sample_aspect_ratio= 
2120                         av_div_q(
2121                          mpeg2_aspect[s->aspect_ratio_info], 
2122                          (AVRational){s->width, s->height}
2123                          );
2124                 }else{
2125                     s->avctx->sample_aspect_ratio= 
2126                         av_div_q(
2127                          mpeg2_aspect[s->aspect_ratio_info], 
2128                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2129                         );
2130                 }
2131             }else{
2132                 s->avctx->sample_aspect_ratio= 
2133                     mpeg2_aspect[s->aspect_ratio_info];
2134             }
2135         }//mpeg2
2136
2137         if(avctx->xvmc_acceleration){
2138             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2139         }else{
2140             if(s->chroma_format <  2){
2141                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2142             }else
2143             if(s->chroma_format == 2){
2144                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2145             }else
2146             if(s->chroma_format >  2){
2147                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2148             }
2149         }
2150         //until then pix_fmt may be changed right after codec init
2151         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2152             if( avctx->idct_algo == FF_IDCT_AUTO )
2153                 avctx->idct_algo = FF_IDCT_SIMPLE;
2154
2155         //quantization matrixes may need reordering 
2156         //if dct permutation is changed
2157         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2158
2159         if (MPV_common_init(s) < 0)
2160             return -2;
2161
2162         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2163         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2164         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2165         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2166
2167         s1->mpeg_enc_ctx_allocated = 1;
2168     }
2169     return 0;
2170 }
2171
2172 /* return the 8 bit start code value and update the search
2173    state. Return -1 if no start code found */
2174 static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
2175 {
2176     const uint8_t *buf_ptr= *pbuf_ptr;
2177
2178     buf_ptr++; //gurantees that -1 is within the array
2179     buf_end -= 2; // gurantees that +2 is within the array
2180
2181     while (buf_ptr < buf_end) {
2182         if(*buf_ptr==0){
2183             while(buf_ptr < buf_end && buf_ptr[1]==0)
2184                 buf_ptr++;
2185
2186             if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
2187                 *pbuf_ptr = buf_ptr+3;
2188                 return buf_ptr[2] + 0x100;
2189             }
2190         }
2191         buf_ptr += 2;
2192     }
2193     buf_end += 2; //undo the hack above
2194     
2195     *pbuf_ptr = buf_end;
2196     return -1;
2197 }
2198
2199 static int mpeg1_decode_picture(AVCodecContext *avctx, 
2200                                 const uint8_t *buf, int buf_size)
2201 {
2202     Mpeg1Context *s1 = avctx->priv_data;
2203     MpegEncContext *s = &s1->mpeg_enc_ctx;
2204     int ref, f_code, vbv_delay;
2205
2206     if(mpeg_decode_postinit(s->avctx) < 0) 
2207        return -2;
2208
2209     init_get_bits(&s->gb, buf, buf_size*8);
2210
2211     ref = get_bits(&s->gb, 10); /* temporal ref */
2212     s->pict_type = get_bits(&s->gb, 3);
2213     if(s->pict_type == 0 || s->pict_type > 3)
2214         return -1;
2215
2216     vbv_delay= get_bits(&s->gb, 16);
2217     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2218         s->full_pel[0] = get_bits1(&s->gb);
2219         f_code = get_bits(&s->gb, 3);
2220         if (f_code == 0)
2221             return -1;
2222         s->mpeg_f_code[0][0] = f_code;
2223         s->mpeg_f_code[0][1] = f_code;
2224     }
2225     if (s->pict_type == B_TYPE) {
2226         s->full_pel[1] = get_bits1(&s->gb);
2227         f_code = get_bits(&s->gb, 3);
2228         if (f_code == 0)
2229             return -1;
2230         s->mpeg_f_code[1][0] = f_code;
2231         s->mpeg_f_code[1][1] = f_code;
2232     }
2233     s->current_picture.pict_type= s->pict_type;
2234     s->current_picture.key_frame= s->pict_type == I_TYPE;
2235     
2236     if(avctx->debug & FF_DEBUG_PICT_INFO)
2237         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2238     
2239     s->y_dc_scale = 8;
2240     s->c_dc_scale = 8;
2241     s->first_slice = 1;
2242     return 0;
2243 }
2244
2245 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2246 {
2247     MpegEncContext *s= &s1->mpeg_enc_ctx;
2248     int horiz_size_ext, vert_size_ext;
2249     int bit_rate_ext;
2250
2251     skip_bits(&s->gb, 1); /* profil and level esc*/
2252     s->avctx->profile= get_bits(&s->gb, 3);
2253     s->avctx->level= get_bits(&s->gb, 4);
2254     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2255     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2256     horiz_size_ext = get_bits(&s->gb, 2);
2257     vert_size_ext = get_bits(&s->gb, 2);
2258     s->width |= (horiz_size_ext << 12);
2259     s->height |= (vert_size_ext << 12);
2260     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2261     s->bit_rate += (bit_rate_ext << 18) * 400;
2262     skip_bits1(&s->gb); /* marker */
2263     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2264
2265     s->low_delay = get_bits1(&s->gb);
2266     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2267
2268     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2269     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2270
2271     dprintf("sequence extension\n");
2272     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2273     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2274
2275     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2276         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
2277                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2278
2279 }
2280
2281 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2282 {
2283     MpegEncContext *s= &s1->mpeg_enc_ctx;
2284     int color_description, w, h;
2285
2286     skip_bits(&s->gb, 3); /* video format */
2287     color_description= get_bits1(&s->gb);
2288     if(color_description){
2289         skip_bits(&s->gb, 8); /* color primaries */
2290         skip_bits(&s->gb, 8); /* transfer_characteristics */
2291         skip_bits(&s->gb, 8); /* matrix_coefficients */
2292     }
2293     w= get_bits(&s->gb, 14);
2294     skip_bits(&s->gb, 1); //marker
2295     h= get_bits(&s->gb, 14);
2296     skip_bits(&s->gb, 1); //marker
2297     
2298     s1->pan_scan.width= 16*w;
2299     s1->pan_scan.height=16*h;
2300         
2301     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2302         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2303 }
2304
2305 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2306 {
2307     MpegEncContext *s= &s1->mpeg_enc_ctx;
2308     int i,nofco;
2309
2310     nofco = 1;
2311     if(s->progressive_sequence){
2312         if(s->repeat_first_field){
2313             nofco++;
2314             if(s->top_field_first)
2315                 nofco++;        
2316         }
2317     }else{
2318         if(s->picture_structure == PICT_FRAME){
2319             nofco++;
2320             if(s->repeat_first_field)
2321                 nofco++;
2322         }
2323     }
2324     for(i=0; i<nofco; i++){
2325         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2326         skip_bits(&s->gb, 1); //marker
2327         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2328         skip_bits(&s->gb, 1); //marker
2329     }
2330    
2331     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2332         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
2333             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
2334             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
2335             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2336         );
2337 }
2338
2339 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2340 {
2341     int i, v, j;
2342
2343     dprintf("matrix extension\n");
2344
2345     if (get_bits1(&s->gb)) {
2346         for(i=0;i<64;i++) {
2347             v = get_bits(&s->gb, 8);
2348             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2349             s->intra_matrix[j] = v;
2350             s->chroma_intra_matrix[j] = v;
2351         }
2352     }
2353     if (get_bits1(&s->gb)) {
2354         for(i=0;i<64;i++) {
2355             v = get_bits(&s->gb, 8);
2356             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2357             s->inter_matrix[j] = v;
2358             s->chroma_inter_matrix[j] = v;
2359         }
2360     }
2361     if (get_bits1(&s->gb)) {
2362         for(i=0;i<64;i++) {
2363             v = get_bits(&s->gb, 8);
2364             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2365             s->chroma_intra_matrix[j] = v;
2366         }
2367     }
2368     if (get_bits1(&s->gb)) {
2369         for(i=0;i<64;i++) {
2370             v = get_bits(&s->gb, 8);
2371             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2372             s->chroma_inter_matrix[j] = v;
2373         }
2374     }
2375 }
2376
2377 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2378 {
2379     s->full_pel[0] = s->full_pel[1] = 0;
2380     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2381     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2382     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2383     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2384     s->intra_dc_precision = get_bits(&s->gb, 2);
2385     s->picture_structure = get_bits(&s->gb, 2);
2386     s->top_field_first = get_bits1(&s->gb);
2387     s->frame_pred_frame_dct = get_bits1(&s->gb);
2388     s->concealment_motion_vectors = get_bits1(&s->gb);
2389     s->q_scale_type = get_bits1(&s->gb);
2390     s->intra_vlc_format = get_bits1(&s->gb);
2391     s->alternate_scan = get_bits1(&s->gb);
2392     s->repeat_first_field = get_bits1(&s->gb);
2393     s->chroma_420_type = get_bits1(&s->gb);
2394     s->progressive_frame = get_bits1(&s->gb);
2395
2396     if(s->picture_structure == PICT_FRAME)
2397         s->first_field=0;
2398     else{
2399         s->first_field ^= 1;
2400         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2401     }
2402     
2403     if(s->alternate_scan){
2404         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2405         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2406     }else{
2407         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2408         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2409     }
2410     
2411     /* composite display not parsed */
2412     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2413     dprintf("picture_structure=%d\n", s->picture_structure);
2414     dprintf("top field first=%d\n", s->top_field_first);
2415     dprintf("repeat first field=%d\n", s->repeat_first_field);
2416     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2417     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2418     dprintf("alternate_scan=%d\n", s->alternate_scan);
2419     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2420     dprintf("progressive_frame=%d\n", s->progressive_frame);
2421 }
2422
2423 static void mpeg_decode_extension(AVCodecContext *avctx, 
2424                                   const uint8_t *buf, int buf_size)
2425 {
2426     Mpeg1Context *s1 = avctx->priv_data;
2427     MpegEncContext *s = &s1->mpeg_enc_ctx;
2428     int ext_type;
2429
2430     init_get_bits(&s->gb, buf, buf_size*8);
2431     
2432     ext_type = get_bits(&s->gb, 4);
2433     switch(ext_type) {
2434     case 0x1:
2435         mpeg_decode_sequence_extension(s1);
2436         break;
2437     case 0x2:
2438         mpeg_decode_sequence_display_extension(s1);
2439         break;
2440     case 0x3:
2441         mpeg_decode_quant_matrix_extension(s);
2442         break;
2443     case 0x7:
2444         mpeg_decode_picture_display_extension(s1);
2445         break;
2446     case 0x8:
2447         mpeg_decode_picture_coding_extension(s);
2448         break;
2449     }
2450 }
2451
2452 static void exchange_uv(MpegEncContext *s){
2453     short * tmp = s->pblocks[4];
2454     s->pblocks[4] = s->pblocks[5];
2455     s->pblocks[5] = tmp;
2456 }
2457
2458 static int mpeg_field_start(MpegEncContext *s){
2459     AVCodecContext *avctx= s->avctx;
2460     Mpeg1Context *s1 = (Mpeg1Context*)s;
2461
2462     /* start frame decoding */
2463     if(s->first_field || s->picture_structure==PICT_FRAME){
2464         if(MPV_frame_start(s, avctx) < 0)
2465             return -1;
2466
2467         ff_er_frame_start(s);
2468
2469         /* first check if we must repeat the frame */
2470         s->current_picture_ptr->repeat_pict = 0;
2471         if (s->repeat_first_field) {
2472             if (s->progressive_sequence) {
2473                 if (s->top_field_first)
2474                     s->current_picture_ptr->repeat_pict = 4;
2475                 else
2476                     s->current_picture_ptr->repeat_pict = 2;
2477             } else if (s->progressive_frame) {
2478                 s->current_picture_ptr->repeat_pict = 1;
2479             }
2480         }         
2481
2482         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2483     }else{ //second field
2484             int i;
2485             
2486             if(!s->current_picture_ptr){
2487                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2488                 return -1;
2489             }
2490             
2491             for(i=0; i<4; i++){
2492                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2493                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2494                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2495                 } 
2496             }
2497     }
2498 #ifdef HAVE_XVMC
2499 // MPV_frame_start will call this function too,
2500 // but we need to call it on every field
2501     if(s->avctx->xvmc_acceleration)
2502          XVMC_field_start(s,avctx);
2503 #endif
2504
2505     return 0;
2506 }
2507
2508 #define DECODE_SLICE_ERROR -1
2509 #define DECODE_SLICE_OK 0
2510
2511 /**
2512  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2513  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2514  *         DECODE_SLICE_OK if this slice is ok<br>
2515  */
2516 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2517                              const uint8_t **buf, int buf_size)
2518 {
2519     MpegEncContext *s = &s1->mpeg_enc_ctx;
2520     AVCodecContext *avctx= s->avctx;
2521     int ret;
2522     const int field_pic= s->picture_structure != PICT_FRAME;
2523     const int lowres= s->avctx->lowres;
2524
2525     s->resync_mb_x=
2526     s->resync_mb_y= -1;
2527
2528     if (mb_y<<field_pic >= s->mb_height){
2529         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2530         return -1;
2531     }
2532     
2533     init_get_bits(&s->gb, *buf, buf_size*8);
2534
2535     ff_mpeg1_clean_buffers(s);
2536     s->interlaced_dct = 0;
2537
2538     s->qscale = get_qscale(s);
2539
2540     if(s->qscale == 0){
2541         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2542         return -1;
2543     }
2544     
2545     /* extra slice info */
2546     while (get_bits1(&s->gb) != 0) {
2547         skip_bits(&s->gb, 8);
2548     }
2549     
2550     s->mb_x=0;
2551
2552     for(;;) {
2553         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2554         if (code < 0){
2555             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2556             return -1;
2557         }
2558         if (code >= 33) {
2559             if (code == 33) {
2560                 s->mb_x += 33;
2561             }
2562             /* otherwise, stuffing, nothing to do */
2563         } else {
2564             s->mb_x += code;
2565             break;
2566         }
2567     }
2568
2569     s->resync_mb_x= s->mb_x;
2570     s->resync_mb_y= s->mb_y= mb_y;
2571     s->mb_skip_run= 0;
2572     ff_init_block_index(s);
2573
2574     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2575         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2576              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", 
2577                  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],
2578                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2579                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2580                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2581                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2582         }
2583     }    
2584     
2585     for(;;) {
2586 #ifdef HAVE_XVMC
2587         //one 1 we memcpy blocks in xvmcvideo
2588         if(s->avctx->xvmc_acceleration > 1)
2589             XVMC_init_block(s);//set s->block
2590 #endif
2591
2592         ret = mpeg_decode_mb(s, s->block);
2593         s->chroma_qscale= s->qscale;
2594
2595         dprintf("ret=%d\n", ret);
2596         if (ret < 0)
2597             return -1;
2598
2599         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2600             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2601             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2602             int motion_x, motion_y, dir, i;
2603             if(field_pic && !s->first_field)
2604                 xy += wrap/2;
2605
2606             for(i=0; i<2; i++){
2607                 for(dir=0; dir<2; dir++){
2608                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2609                         motion_x = motion_y = 0;
2610                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2611                         motion_x = s->mv[dir][0][0];
2612                         motion_y = s->mv[dir][0][1];
2613                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2614                         motion_x = s->mv[dir][i][0];
2615                         motion_y = s->mv[dir][i][1];
2616                     }
2617
2618                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2619                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2620                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2621                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2622                     s->current_picture.ref_index [dir][xy    ]=
2623                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2624                 }
2625                 xy += wrap;
2626             }
2627         }
2628
2629         s->dest[0] += 16 >> lowres;
2630         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2631         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2632
2633         MPV_decode_mb(s, s->block);
2634         
2635         if (++s->mb_x >= s->mb_width) {
2636             const int mb_size= 16>>s->avctx->lowres;
2637
2638             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2639
2640             s->mb_x = 0;
2641             s->mb_y++;
2642
2643             if(s->mb_y<<field_pic >= s->mb_height){
2644                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2645
2646                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2647                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2648                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2649                     return -1;
2650                 }else
2651                     goto eos;
2652             }
2653             
2654             ff_init_block_index(s);
2655         }
2656
2657         /* skip mb handling */
2658         if (s->mb_skip_run == -1) {
2659             /* read again increment */
2660             s->mb_skip_run = 0;
2661             for(;;) {
2662                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2663                 if (code < 0){
2664                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2665                     return -1;
2666                 }
2667                 if (code >= 33) {
2668                     if (code == 33) {
2669                         s->mb_skip_run += 33;
2670                     }else if(code == 35){
2671                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2672                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2673                             return -1;
2674                         }
2675                         goto eos; /* end of slice */
2676                     }
2677                     /* otherwise, stuffing, nothing to do */
2678                 } else {
2679                     s->mb_skip_run += code;
2680                     break;
2681                 }
2682             }
2683         }
2684     }
2685 eos: // end of slice
2686     *buf += get_bits_count(&s->gb)/8 - 1;
2687 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2688     return 0;
2689 }
2690
2691 static int slice_decode_thread(AVCodecContext *c, void *arg){
2692     MpegEncContext *s= arg;
2693     const uint8_t *buf= s->gb.buffer;
2694     int mb_y= s->start_mb_y;
2695
2696     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2697
2698     for(;;){
2699         int start_code, ret;
2700
2701         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2702         emms_c();
2703 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2704 //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);
2705         if(ret < 0){
2706             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2707                 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);
2708         }else{
2709             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);
2710         }
2711         
2712         if(s->mb_y == s->end_mb_y)
2713             return 0;
2714         
2715         start_code = find_start_code(&buf, s->gb.buffer_end);
2716         mb_y= start_code - SLICE_MIN_START_CODE;
2717         if(mb_y < 0 || mb_y >= s->end_mb_y)
2718             return -1;
2719     }
2720     
2721     return 0; //not reached
2722 }
2723
2724 /**
2725  * handles slice ends.
2726  * @return 1 if it seems to be the last slice of 
2727  */
2728 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2729 {
2730     Mpeg1Context *s1 = avctx->priv_data;
2731     MpegEncContext *s = &s1->mpeg_enc_ctx;
2732        
2733     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2734         return 0;
2735
2736 #ifdef HAVE_XVMC
2737     if(s->avctx->xvmc_acceleration)
2738         XVMC_field_end(s);
2739 #endif
2740     /* end of slice reached */
2741     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2742         /* end of image */
2743
2744         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2745
2746         ff_er_frame_end(s);
2747
2748         MPV_frame_end(s);
2749
2750         if (s->pict_type == B_TYPE || s->low_delay) {
2751             *pict= *(AVFrame*)s->current_picture_ptr;
2752             ff_print_debug_info(s, pict);
2753         } else {
2754             s->picture_number++;
2755             /* latency of 1 frame for I and P frames */
2756             /* XXX: use another variable than picture_number */
2757             if (s->last_picture_ptr != NULL) {
2758                 *pict= *(AVFrame*)s->last_picture_ptr;
2759                  ff_print_debug_info(s, pict);
2760             }
2761         }
2762
2763         return 1;
2764     } else {
2765         return 0;
2766     }
2767 }
2768
2769 static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2770                                  const uint8_t *buf, int buf_size)
2771 {
2772     Mpeg1Context *s1 = avctx->priv_data;
2773     MpegEncContext *s = &s1->mpeg_enc_ctx;
2774     int width,height;
2775     int i, v, j;
2776
2777     init_get_bits(&s->gb, buf, buf_size*8);
2778
2779     width = get_bits(&s->gb, 12);
2780     height = get_bits(&s->gb, 12);
2781     if (width <= 0 || height <= 0 ||
2782         (width % 2) != 0 || (height % 2) != 0)
2783         return -1;
2784     s->aspect_ratio_info= get_bits(&s->gb, 4);
2785     if (s->aspect_ratio_info == 0)
2786         return -1;
2787     s->frame_rate_index = get_bits(&s->gb, 4);
2788     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2789         return -1;
2790     s->bit_rate = get_bits(&s->gb, 18) * 400;
2791     if (get_bits1(&s->gb) == 0) /* marker */
2792         return -1;
2793     s->width = width;
2794     s->height = height;
2795
2796     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2797     skip_bits(&s->gb, 1);
2798
2799     /* get matrix */
2800     if (get_bits1(&s->gb)) {
2801         for(i=0;i<64;i++) {
2802             v = get_bits(&s->gb, 8);
2803             if(v==0){
2804                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2805                 return -1;
2806             }
2807             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2808             s->intra_matrix[j] = v;
2809             s->chroma_intra_matrix[j] = v;
2810         }
2811 #ifdef DEBUG
2812         dprintf("intra matrix present\n");
2813         for(i=0;i<64;i++)
2814             dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2815         printf("\n");
2816 #endif
2817     } else {
2818         for(i=0;i<64;i++) {
2819             j = s->dsp.idct_permutation[i];
2820             v = ff_mpeg1_default_intra_matrix[i];
2821             s->intra_matrix[j] = v;
2822             s->chroma_intra_matrix[j] = v;
2823         }
2824     }
2825     if (get_bits1(&s->gb)) {
2826         for(i=0;i<64;i++) {
2827             v = get_bits(&s->gb, 8);
2828             if(v==0){
2829                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2830                 return -1;
2831             }
2832             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2833             s->inter_matrix[j] = v;
2834             s->chroma_inter_matrix[j] = v;
2835         }
2836 #ifdef DEBUG
2837         dprintf("non intra matrix present\n");
2838         for(i=0;i<64;i++)
2839             dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2840         printf("\n");
2841 #endif
2842     } else {
2843         for(i=0;i<64;i++) {
2844             int j= s->dsp.idct_permutation[i];
2845             v = ff_mpeg1_default_non_intra_matrix[i];
2846             s->inter_matrix[j] = v;
2847             s->chroma_inter_matrix[j] = v;
2848         }
2849     }
2850     
2851     if(show_bits(&s->gb, 23) != 0){
2852         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2853         return -1;
2854     }
2855
2856     /* we set mpeg2 parameters so that it emulates mpeg1 */
2857     s->progressive_sequence = 1;
2858     s->progressive_frame = 1;
2859     s->picture_structure = PICT_FRAME;
2860     s->frame_pred_frame_dct = 1;
2861     s->chroma_format = 1;
2862     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2863     avctx->sub_id = 1; /* indicates mpeg1 */
2864     s->out_format = FMT_MPEG1;
2865     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2866     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2867     
2868     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2869         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2870                s->avctx->rc_buffer_size, s->bit_rate);
2871     
2872     return 0;
2873 }
2874
2875 static int vcr2_init_sequence(AVCodecContext *avctx)
2876 {
2877     Mpeg1Context *s1 = avctx->priv_data;
2878     MpegEncContext *s = &s1->mpeg_enc_ctx;
2879     int i, v;
2880
2881     /* start new mpeg1 context decoding */
2882     s->out_format = FMT_MPEG1;
2883     if (s1->mpeg_enc_ctx_allocated) {
2884         MPV_common_end(s);
2885     }
2886     s->width  = avctx->coded_width;
2887     s->height = avctx->coded_height;
2888     avctx->has_b_frames= 0; //true?
2889     s->low_delay= 1;
2890
2891     if(avctx->xvmc_acceleration){
2892         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2893     }else{
2894         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2895     }
2896
2897     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2898         if( avctx->idct_algo == FF_IDCT_AUTO )
2899             avctx->idct_algo = FF_IDCT_SIMPLE;
2900     
2901     if (MPV_common_init(s) < 0)
2902         return -1;
2903     exchange_uv(s);//common init reset pblocks, so we swap them here
2904     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2905     s1->mpeg_enc_ctx_allocated = 1;
2906
2907     for(i=0;i<64;i++) {
2908         int j= s->dsp.idct_permutation[i];
2909         v = ff_mpeg1_default_intra_matrix[i];
2910         s->intra_matrix[j] = v;
2911         s->chroma_intra_matrix[j] = v;
2912
2913         v = ff_mpeg1_default_non_intra_matrix[i];
2914         s->inter_matrix[j] = v;
2915         s->chroma_inter_matrix[j] = v;
2916     }
2917
2918     s->progressive_sequence = 1;
2919     s->progressive_frame = 1;
2920     s->picture_structure = PICT_FRAME;
2921     s->frame_pred_frame_dct = 1;
2922     s->chroma_format = 1;
2923     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2924     avctx->sub_id = 2; /* indicates mpeg2 */
2925     return 0;
2926 }
2927
2928
2929 static void mpeg_decode_user_data(AVCodecContext *avctx, 
2930                                   const uint8_t *buf, int buf_size)
2931 {
2932     const uint8_t *p;
2933     int len, flags;
2934     p = buf;
2935     len = buf_size;
2936
2937     /* we parse the DTG active format information */
2938     if (len >= 5 &&
2939         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2940         flags = p[4];
2941         p += 5;
2942         len -= 5;
2943         if (flags & 0x80) {
2944             /* skip event id */
2945             if (len < 2)
2946                 return;
2947             p += 2;
2948             len -= 2;
2949         }
2950         if (flags & 0x40) {
2951             if (len < 1)
2952                 return;
2953             avctx->dtg_active_format = p[0] & 0x0f;
2954         }
2955     }
2956 }
2957
2958 static void mpeg_decode_gop(AVCodecContext *avctx, 
2959                             const uint8_t *buf, int buf_size){
2960     Mpeg1Context *s1 = avctx->priv_data;
2961     MpegEncContext *s = &s1->mpeg_enc_ctx;
2962
2963     int drop_frame_flag;
2964     int time_code_hours, time_code_minutes;
2965     int time_code_seconds, time_code_pictures;
2966     int broken_link;
2967
2968     init_get_bits(&s->gb, buf, buf_size*8);
2969
2970     drop_frame_flag = get_bits1(&s->gb);
2971     
2972     time_code_hours=get_bits(&s->gb,5);
2973     time_code_minutes = get_bits(&s->gb,6);
2974     skip_bits1(&s->gb);//marker bit
2975     time_code_seconds = get_bits(&s->gb,6);
2976     time_code_pictures = get_bits(&s->gb,6);
2977
2978     /*broken_link indicate that after editing the
2979       reference frames of the first B-Frames after GOP I-Frame
2980       are missing (open gop)*/
2981     broken_link = get_bits1(&s->gb);
2982
2983     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2984         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2985             time_code_hours, time_code_minutes, time_code_seconds,
2986             time_code_pictures, broken_link);
2987 }
2988 /**
2989  * finds the end of the current frame in the bitstream.
2990  * @return the position of the first byte of the next frame, or -1
2991  */
2992 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2993 {
2994     int i;
2995     uint32_t state;
2996     
2997     state= pc->state;
2998     
2999     i=0;
3000     if(!pc->frame_start_found){
3001         for(i=0; i<buf_size; i++){
3002             state= (state<<8) | buf[i];
3003             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3004                 i++;
3005                 pc->frame_start_found=1;
3006                 break;
3007             }
3008         }
3009     }
3010     
3011     if(pc->frame_start_found){
3012         /* EOF considered as end of frame */
3013         if (buf_size == 0)
3014             return 0;
3015         for(; i<buf_size; i++){
3016             state= (state<<8) | buf[i];
3017             if((state&0xFFFFFF00) == 0x100){
3018                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3019                     pc->frame_start_found=0;
3020                     pc->state=-1; 
3021                     return i-3;
3022                 }
3023             }
3024         }
3025     }        
3026     pc->state= state;
3027     return END_NOT_FOUND;
3028 }
3029
3030 /* handle buffering and image synchronisation */
3031 static int mpeg_decode_frame(AVCodecContext *avctx, 
3032                              void *data, int *data_size,
3033                              uint8_t *buf, int buf_size)
3034 {
3035     Mpeg1Context *s = avctx->priv_data;
3036     const uint8_t *buf_end;
3037     const uint8_t *buf_ptr;
3038     int ret, start_code, input_size;
3039     AVFrame *picture = data;
3040     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3041     dprintf("fill_buffer\n");
3042
3043     if (buf_size == 0) {
3044         /* special case for last picture */
3045         if (s2->low_delay==0 && s2->next_picture_ptr) {
3046             *picture= *(AVFrame*)s2->next_picture_ptr;
3047             s2->next_picture_ptr= NULL;
3048
3049             *data_size = sizeof(AVFrame);
3050         }
3051         return 0;
3052     }
3053
3054     if(s2->flags&CODEC_FLAG_TRUNCATED){
3055         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3056         
3057         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3058             return buf_size;
3059     }    
3060     
3061     buf_ptr = buf;
3062     buf_end = buf + buf_size;
3063
3064 #if 0    
3065     if (s->repeat_field % 2 == 1) { 
3066         s->repeat_field++;
3067         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3068         //        s2->picture_number, s->repeat_field);
3069         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3070             *data_size = sizeof(AVPicture);
3071             goto the_end;
3072         }
3073     }
3074 #endif
3075
3076     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3077         vcr2_init_sequence(avctx);
3078     
3079     s->slice_count= 0;
3080         
3081     for(;;) {
3082         /* find start next code */
3083         start_code = find_start_code(&buf_ptr, buf_end);
3084         if (start_code < 0){
3085             if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
3086                 if(avctx->thread_count > 1){
3087                     int i;
3088
3089                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3090                     for(i=0; i<s->slice_count; i++)
3091                         s2->error_count += s2->thread_context[i]->error_count;
3092                 }
3093                 if (slice_end(avctx, picture)) {
3094                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3095                         *data_size = sizeof(AVPicture);
3096                 }
3097             }
3098             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3099         }
3100         
3101         input_size = buf_end - buf_ptr;
3102
3103         if(avctx->debug & FF_DEBUG_STARTCODE){
3104             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3105         }
3106
3107                 /* prepare data for next start code */
3108                 switch(start_code) {
3109                 case SEQ_START_CODE:
3110                     mpeg1_decode_sequence(avctx, buf_ptr, 
3111                                           input_size);
3112                     break;
3113                             
3114                 case PICTURE_START_CODE:
3115                     /* we have a complete image : we try to decompress it */
3116                     mpeg1_decode_picture(avctx, 
3117                                          buf_ptr, input_size);
3118                     break;
3119                 case EXT_START_CODE:
3120                     mpeg_decode_extension(avctx,
3121                                           buf_ptr, input_size);
3122                     break;
3123                 case USER_START_CODE:
3124                     mpeg_decode_user_data(avctx, 
3125                                           buf_ptr, input_size);
3126                     break;
3127                 case GOP_START_CODE:
3128                     s2->first_field=0;
3129                     mpeg_decode_gop(avctx, 
3130                                           buf_ptr, input_size);
3131                     break;
3132                 default:
3133                     if (start_code >= SLICE_MIN_START_CODE &&
3134                         start_code <= SLICE_MAX_START_CODE) {
3135                         int mb_y= start_code - SLICE_MIN_START_CODE;
3136                         
3137                         /* skip b frames if we dont have reference frames */
3138                         if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
3139                         /* skip b frames if we are in a hurry */
3140                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3141                         /* skip everything if we are in a hurry>=5 */
3142                         if(avctx->hurry_up>=5) break;
3143                         
3144                         if (!s->mpeg_enc_ctx_allocated) break;
3145
3146                         if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3147                             if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3148                                 break;
3149                         }
3150                         
3151                         if(s2->first_slice){
3152                             s2->first_slice=0;
3153                             if(mpeg_field_start(s2) < 0)
3154                                 return -1;
3155                         }
3156                         
3157                         if(avctx->thread_count > 1){
3158                             int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3159                             if(threshold <= mb_y){
3160                                 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3161                                 
3162                                 thread_context->start_mb_y= mb_y;
3163                                 thread_context->end_mb_y  = s2->mb_height;
3164                                 if(s->slice_count){
3165                                     s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3166                                     ff_update_duplicate_context(thread_context, s2);
3167                                 }
3168                                 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3169                                 s->slice_count++;
3170                             }
3171                             buf_ptr += 2; //FIXME add minimum num of bytes per slice
3172                         }else{
3173                             ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3174                             emms_c();
3175
3176                             if(ret < 0){
3177                                 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3178                                     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);
3179                             }else{
3180                                 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);
3181                             }
3182                         }
3183                     }
3184                     break;
3185                 }
3186     }
3187 }
3188
3189 static int mpeg_decode_end(AVCodecContext *avctx)
3190 {
3191     Mpeg1Context *s = avctx->priv_data;
3192
3193     if (s->mpeg_enc_ctx_allocated)
3194         MPV_common_end(&s->mpeg_enc_ctx);
3195     return 0;
3196 }
3197
3198 AVCodec mpeg1video_decoder = {
3199     "mpeg1video",
3200     CODEC_TYPE_VIDEO,
3201     CODEC_ID_MPEG1VIDEO,
3202     sizeof(Mpeg1Context),
3203     mpeg_decode_init,
3204     NULL,
3205     mpeg_decode_end,
3206     mpeg_decode_frame,
3207     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3208     .flush= ff_mpeg_flush,
3209 };
3210
3211 AVCodec mpeg2video_decoder = {
3212     "mpeg2video",
3213     CODEC_TYPE_VIDEO,
3214     CODEC_ID_MPEG2VIDEO,
3215     sizeof(Mpeg1Context),
3216     mpeg_decode_init,
3217     NULL,
3218     mpeg_decode_end,
3219     mpeg_decode_frame,
3220     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3221     .flush= ff_mpeg_flush,
3222 };
3223
3224 //legacy decoder
3225 AVCodec mpegvideo_decoder = {
3226     "mpegvideo",
3227     CODEC_TYPE_VIDEO,
3228     CODEC_ID_MPEG2VIDEO,
3229     sizeof(Mpeg1Context),
3230     mpeg_decode_init,
3231     NULL,
3232     mpeg_decode_end,
3233     mpeg_decode_frame,
3234     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3235     .flush= ff_mpeg_flush,
3236 };
3237
3238 #ifdef CONFIG_ENCODERS
3239
3240 AVCodec mpeg1video_encoder = {
3241     "mpeg1video",
3242     CODEC_TYPE_VIDEO,
3243     CODEC_ID_MPEG1VIDEO,
3244     sizeof(MpegEncContext),
3245     encode_init,
3246     MPV_encode_picture,
3247     MPV_encode_end,
3248     .supported_framerates= frame_rate_tab+1,
3249     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3250     .capabilities= CODEC_CAP_DELAY,
3251 };
3252
3253 AVCodec mpeg2video_encoder = {
3254     "mpeg2video",
3255     CODEC_TYPE_VIDEO,
3256     CODEC_ID_MPEG2VIDEO,
3257     sizeof(MpegEncContext),
3258     encode_init,
3259     MPV_encode_picture,
3260     MPV_encode_end,
3261     .supported_framerates= frame_rate_tab+1,
3262     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3263     .capabilities= CODEC_CAP_DELAY,
3264 };
3265 #endif
3266
3267 #ifdef HAVE_XVMC
3268 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3269     Mpeg1Context *s;
3270
3271     if( avctx->thread_count > 1) 
3272         return -1;
3273     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3274         return -1;
3275     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3276         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3277     }
3278     mpeg_decode_init(avctx);
3279     s = avctx->priv_data;
3280
3281     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3282     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3283
3284     return 0;
3285 }
3286
3287 AVCodec mpeg_xvmc_decoder = {
3288     "mpegvideo_xvmc",
3289     CODEC_TYPE_VIDEO,
3290     CODEC_ID_MPEG2VIDEO_XVMC,
3291     sizeof(Mpeg1Context),
3292     mpeg_mc_decode_init,
3293     NULL,
3294     mpeg_decode_end,
3295     mpeg_decode_frame,
3296     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3297     .flush= ff_mpeg_flush,
3298 };
3299
3300 #endif
3301
3302 /* this is ugly i know, but the alternative is too make 
3303    hundreds of vars global and prefix them with ff_mpeg1_
3304    which is far uglier. */
3305 #include "mdec.c"