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[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 > FF_COMPLIANCE_INOFFICIAL && 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 > FF_COMPLIANCE_EXPERIMENTAL){
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         s->progressive_frame = s->progressive_sequence;
472         put_bits(&s->pb, 1, s->chroma_420_type=s->progressive_frame);
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             ParseContext pc= s->parse_context;
2087             s->parse_context.buffer=0;
2088             MPV_common_end(s);
2089             s->parse_context= pc;
2090         }
2091
2092         if( (s->width == 0 )||(s->height == 0))
2093             return -2;
2094
2095         avcodec_set_dimensions(avctx, s->width, s->height);
2096         avctx->bit_rate = s->bit_rate;
2097         s1->save_aspect_info = s->aspect_ratio_info;
2098
2099      //low_delay may be forced, in this case we will have B frames
2100      //that behave like P frames
2101         avctx->has_b_frames = !(s->low_delay);
2102
2103         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2104             //mpeg1 fps
2105             avctx->time_base.den     = frame_rate_tab[s->frame_rate_index].num;
2106             avctx->time_base.num= frame_rate_tab[s->frame_rate_index].den;
2107             //mpeg1 aspect
2108             avctx->sample_aspect_ratio= av_d2q(
2109                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2110
2111         }else{//mpeg2
2112         //mpeg2 fps
2113             av_reduce(
2114                 &s->avctx->time_base.den, 
2115                 &s->avctx->time_base.num, 
2116                 frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2117                 frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2118                 1<<30);
2119         //mpeg2 aspect
2120             if(s->aspect_ratio_info > 1){
2121                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2122                     s->avctx->sample_aspect_ratio= 
2123                         av_div_q(
2124                          mpeg2_aspect[s->aspect_ratio_info], 
2125                          (AVRational){s->width, s->height}
2126                          );
2127                 }else{
2128                     s->avctx->sample_aspect_ratio= 
2129                         av_div_q(
2130                          mpeg2_aspect[s->aspect_ratio_info], 
2131                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2132                         );
2133                 }
2134             }else{
2135                 s->avctx->sample_aspect_ratio= 
2136                     mpeg2_aspect[s->aspect_ratio_info];
2137             }
2138         }//mpeg2
2139
2140         if(avctx->xvmc_acceleration){
2141             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2142         }else{
2143             if(s->chroma_format <  2){
2144                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2145             }else
2146             if(s->chroma_format == 2){
2147                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2148             }else
2149             if(s->chroma_format >  2){
2150                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2151             }
2152         }
2153         //until then pix_fmt may be changed right after codec init
2154         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2155             if( avctx->idct_algo == FF_IDCT_AUTO )
2156                 avctx->idct_algo = FF_IDCT_SIMPLE;
2157
2158         //quantization matrixes may need reordering 
2159         //if dct permutation is changed
2160         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2161
2162         if (MPV_common_init(s) < 0)
2163             return -2;
2164
2165         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2166         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2167         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2168         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2169
2170         s1->mpeg_enc_ctx_allocated = 1;
2171     }
2172     return 0;
2173 }
2174
2175 /* return the 8 bit start code value and update the search
2176    state. Return -1 if no start code found */
2177 static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
2178 {
2179     const uint8_t *buf_ptr= *pbuf_ptr;
2180
2181     buf_ptr++; //gurantees that -1 is within the array
2182     buf_end -= 2; // gurantees that +2 is within the array
2183
2184     while (buf_ptr < buf_end) {
2185         if(*buf_ptr==0){
2186             while(buf_ptr < buf_end && buf_ptr[1]==0)
2187                 buf_ptr++;
2188
2189             if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
2190                 *pbuf_ptr = buf_ptr+3;
2191                 return buf_ptr[2] + 0x100;
2192             }
2193         }
2194         buf_ptr += 2;
2195     }
2196     buf_end += 2; //undo the hack above
2197     
2198     *pbuf_ptr = buf_end;
2199     return -1;
2200 }
2201
2202 static int mpeg1_decode_picture(AVCodecContext *avctx, 
2203                                 const uint8_t *buf, int buf_size)
2204 {
2205     Mpeg1Context *s1 = avctx->priv_data;
2206     MpegEncContext *s = &s1->mpeg_enc_ctx;
2207     int ref, f_code, vbv_delay;
2208
2209     if(mpeg_decode_postinit(s->avctx) < 0) 
2210        return -2;
2211
2212     init_get_bits(&s->gb, buf, buf_size*8);
2213
2214     ref = get_bits(&s->gb, 10); /* temporal ref */
2215     s->pict_type = get_bits(&s->gb, 3);
2216     if(s->pict_type == 0 || s->pict_type > 3)
2217         return -1;
2218
2219     vbv_delay= get_bits(&s->gb, 16);
2220     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2221         s->full_pel[0] = get_bits1(&s->gb);
2222         f_code = get_bits(&s->gb, 3);
2223         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2224             return -1;
2225         s->mpeg_f_code[0][0] = f_code;
2226         s->mpeg_f_code[0][1] = f_code;
2227     }
2228     if (s->pict_type == B_TYPE) {
2229         s->full_pel[1] = get_bits1(&s->gb);
2230         f_code = get_bits(&s->gb, 3);
2231         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2232             return -1;
2233         s->mpeg_f_code[1][0] = f_code;
2234         s->mpeg_f_code[1][1] = f_code;
2235     }
2236     s->current_picture.pict_type= s->pict_type;
2237     s->current_picture.key_frame= s->pict_type == I_TYPE;
2238     
2239     if(avctx->debug & FF_DEBUG_PICT_INFO)
2240         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2241     
2242     s->y_dc_scale = 8;
2243     s->c_dc_scale = 8;
2244     s->first_slice = 1;
2245     return 0;
2246 }
2247
2248 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2249 {
2250     MpegEncContext *s= &s1->mpeg_enc_ctx;
2251     int horiz_size_ext, vert_size_ext;
2252     int bit_rate_ext;
2253
2254     skip_bits(&s->gb, 1); /* profil and level esc*/
2255     s->avctx->profile= get_bits(&s->gb, 3);
2256     s->avctx->level= get_bits(&s->gb, 4);
2257     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2258     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2259     horiz_size_ext = get_bits(&s->gb, 2);
2260     vert_size_ext = get_bits(&s->gb, 2);
2261     s->width |= (horiz_size_ext << 12);
2262     s->height |= (vert_size_ext << 12);
2263     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2264     s->bit_rate += (bit_rate_ext << 18) * 400;
2265     skip_bits1(&s->gb); /* marker */
2266     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2267
2268     s->low_delay = get_bits1(&s->gb);
2269     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2270
2271     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2272     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2273
2274     dprintf("sequence extension\n");
2275     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2276     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2277
2278     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2279         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
2280                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2281
2282 }
2283
2284 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2285 {
2286     MpegEncContext *s= &s1->mpeg_enc_ctx;
2287     int color_description, w, h;
2288
2289     skip_bits(&s->gb, 3); /* video format */
2290     color_description= get_bits1(&s->gb);
2291     if(color_description){
2292         skip_bits(&s->gb, 8); /* color primaries */
2293         skip_bits(&s->gb, 8); /* transfer_characteristics */
2294         skip_bits(&s->gb, 8); /* matrix_coefficients */
2295     }
2296     w= get_bits(&s->gb, 14);
2297     skip_bits(&s->gb, 1); //marker
2298     h= get_bits(&s->gb, 14);
2299     skip_bits(&s->gb, 1); //marker
2300     
2301     s1->pan_scan.width= 16*w;
2302     s1->pan_scan.height=16*h;
2303         
2304     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2305         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2306 }
2307
2308 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2309 {
2310     MpegEncContext *s= &s1->mpeg_enc_ctx;
2311     int i,nofco;
2312
2313     nofco = 1;
2314     if(s->progressive_sequence){
2315         if(s->repeat_first_field){
2316             nofco++;
2317             if(s->top_field_first)
2318                 nofco++;        
2319         }
2320     }else{
2321         if(s->picture_structure == PICT_FRAME){
2322             nofco++;
2323             if(s->repeat_first_field)
2324                 nofco++;
2325         }
2326     }
2327     for(i=0; i<nofco; i++){
2328         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2329         skip_bits(&s->gb, 1); //marker
2330         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2331         skip_bits(&s->gb, 1); //marker
2332     }
2333    
2334     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2335         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
2336             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
2337             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
2338             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2339         );
2340 }
2341
2342 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2343 {
2344     int i, v, j;
2345
2346     dprintf("matrix extension\n");
2347
2348     if (get_bits1(&s->gb)) {
2349         for(i=0;i<64;i++) {
2350             v = get_bits(&s->gb, 8);
2351             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2352             s->intra_matrix[j] = v;
2353             s->chroma_intra_matrix[j] = v;
2354         }
2355     }
2356     if (get_bits1(&s->gb)) {
2357         for(i=0;i<64;i++) {
2358             v = get_bits(&s->gb, 8);
2359             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2360             s->inter_matrix[j] = v;
2361             s->chroma_inter_matrix[j] = v;
2362         }
2363     }
2364     if (get_bits1(&s->gb)) {
2365         for(i=0;i<64;i++) {
2366             v = get_bits(&s->gb, 8);
2367             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2368             s->chroma_intra_matrix[j] = v;
2369         }
2370     }
2371     if (get_bits1(&s->gb)) {
2372         for(i=0;i<64;i++) {
2373             v = get_bits(&s->gb, 8);
2374             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2375             s->chroma_inter_matrix[j] = v;
2376         }
2377     }
2378 }
2379
2380 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2381 {
2382     s->full_pel[0] = s->full_pel[1] = 0;
2383     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2384     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2385     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2386     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2387     s->intra_dc_precision = get_bits(&s->gb, 2);
2388     s->picture_structure = get_bits(&s->gb, 2);
2389     s->top_field_first = get_bits1(&s->gb);
2390     s->frame_pred_frame_dct = get_bits1(&s->gb);
2391     s->concealment_motion_vectors = get_bits1(&s->gb);
2392     s->q_scale_type = get_bits1(&s->gb);
2393     s->intra_vlc_format = get_bits1(&s->gb);
2394     s->alternate_scan = get_bits1(&s->gb);
2395     s->repeat_first_field = get_bits1(&s->gb);
2396     s->chroma_420_type = get_bits1(&s->gb);
2397     s->progressive_frame = get_bits1(&s->gb);
2398
2399     if(s->picture_structure == PICT_FRAME)
2400         s->first_field=0;
2401     else{
2402         s->first_field ^= 1;
2403         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2404     }
2405     
2406     if(s->alternate_scan){
2407         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2408         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2409     }else{
2410         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2411         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2412     }
2413     
2414     /* composite display not parsed */
2415     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2416     dprintf("picture_structure=%d\n", s->picture_structure);
2417     dprintf("top field first=%d\n", s->top_field_first);
2418     dprintf("repeat first field=%d\n", s->repeat_first_field);
2419     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2420     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2421     dprintf("alternate_scan=%d\n", s->alternate_scan);
2422     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2423     dprintf("progressive_frame=%d\n", s->progressive_frame);
2424 }
2425
2426 static void mpeg_decode_extension(AVCodecContext *avctx, 
2427                                   const uint8_t *buf, int buf_size)
2428 {
2429     Mpeg1Context *s1 = avctx->priv_data;
2430     MpegEncContext *s = &s1->mpeg_enc_ctx;
2431     int ext_type;
2432
2433     init_get_bits(&s->gb, buf, buf_size*8);
2434     
2435     ext_type = get_bits(&s->gb, 4);
2436     switch(ext_type) {
2437     case 0x1:
2438         mpeg_decode_sequence_extension(s1);
2439         break;
2440     case 0x2:
2441         mpeg_decode_sequence_display_extension(s1);
2442         break;
2443     case 0x3:
2444         mpeg_decode_quant_matrix_extension(s);
2445         break;
2446     case 0x7:
2447         mpeg_decode_picture_display_extension(s1);
2448         break;
2449     case 0x8:
2450         mpeg_decode_picture_coding_extension(s);
2451         break;
2452     }
2453 }
2454
2455 static void exchange_uv(MpegEncContext *s){
2456     short * tmp = s->pblocks[4];
2457     s->pblocks[4] = s->pblocks[5];
2458     s->pblocks[5] = tmp;
2459 }
2460
2461 static int mpeg_field_start(MpegEncContext *s){
2462     AVCodecContext *avctx= s->avctx;
2463     Mpeg1Context *s1 = (Mpeg1Context*)s;
2464
2465     /* start frame decoding */
2466     if(s->first_field || s->picture_structure==PICT_FRAME){
2467         if(MPV_frame_start(s, avctx) < 0)
2468             return -1;
2469
2470         ff_er_frame_start(s);
2471
2472         /* first check if we must repeat the frame */
2473         s->current_picture_ptr->repeat_pict = 0;
2474         if (s->repeat_first_field) {
2475             if (s->progressive_sequence) {
2476                 if (s->top_field_first)
2477                     s->current_picture_ptr->repeat_pict = 4;
2478                 else
2479                     s->current_picture_ptr->repeat_pict = 2;
2480             } else if (s->progressive_frame) {
2481                 s->current_picture_ptr->repeat_pict = 1;
2482             }
2483         }         
2484
2485         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2486     }else{ //second field
2487             int i;
2488             
2489             if(!s->current_picture_ptr){
2490                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2491                 return -1;
2492             }
2493             
2494             for(i=0; i<4; i++){
2495                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2496                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2497                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2498                 } 
2499             }
2500     }
2501 #ifdef HAVE_XVMC
2502 // MPV_frame_start will call this function too,
2503 // but we need to call it on every field
2504     if(s->avctx->xvmc_acceleration)
2505          XVMC_field_start(s,avctx);
2506 #endif
2507
2508     return 0;
2509 }
2510
2511 #define DECODE_SLICE_ERROR -1
2512 #define DECODE_SLICE_OK 0
2513
2514 /**
2515  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2516  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2517  *         DECODE_SLICE_OK if this slice is ok<br>
2518  */
2519 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2520                              const uint8_t **buf, int buf_size)
2521 {
2522     MpegEncContext *s = &s1->mpeg_enc_ctx;
2523     AVCodecContext *avctx= s->avctx;
2524     int ret;
2525     const int field_pic= s->picture_structure != PICT_FRAME;
2526     const int lowres= s->avctx->lowres;
2527
2528     s->resync_mb_x=
2529     s->resync_mb_y= -1;
2530
2531     if (mb_y<<field_pic >= s->mb_height){
2532         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2533         return -1;
2534     }
2535     
2536     init_get_bits(&s->gb, *buf, buf_size*8);
2537
2538     ff_mpeg1_clean_buffers(s);
2539     s->interlaced_dct = 0;
2540
2541     s->qscale = get_qscale(s);
2542
2543     if(s->qscale == 0){
2544         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2545         return -1;
2546     }
2547     
2548     /* extra slice info */
2549     while (get_bits1(&s->gb) != 0) {
2550         skip_bits(&s->gb, 8);
2551     }
2552     
2553     s->mb_x=0;
2554
2555     for(;;) {
2556         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2557         if (code < 0){
2558             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2559             return -1;
2560         }
2561         if (code >= 33) {
2562             if (code == 33) {
2563                 s->mb_x += 33;
2564             }
2565             /* otherwise, stuffing, nothing to do */
2566         } else {
2567             s->mb_x += code;
2568             break;
2569         }
2570     }
2571
2572     s->resync_mb_x= s->mb_x;
2573     s->resync_mb_y= s->mb_y= mb_y;
2574     s->mb_skip_run= 0;
2575     ff_init_block_index(s);
2576
2577     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2578         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2579              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", 
2580                  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],
2581                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2582                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2583                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2584                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2585         }
2586     }    
2587     
2588     for(;;) {
2589 #ifdef HAVE_XVMC
2590         //one 1 we memcpy blocks in xvmcvideo
2591         if(s->avctx->xvmc_acceleration > 1)
2592             XVMC_init_block(s);//set s->block
2593 #endif
2594
2595         ret = mpeg_decode_mb(s, s->block);
2596         s->chroma_qscale= s->qscale;
2597
2598         dprintf("ret=%d\n", ret);
2599         if (ret < 0)
2600             return -1;
2601
2602         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2603             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2604             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2605             int motion_x, motion_y, dir, i;
2606             if(field_pic && !s->first_field)
2607                 xy += wrap/2;
2608
2609             for(i=0; i<2; i++){
2610                 for(dir=0; dir<2; dir++){
2611                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2612                         motion_x = motion_y = 0;
2613                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2614                         motion_x = s->mv[dir][0][0];
2615                         motion_y = s->mv[dir][0][1];
2616                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2617                         motion_x = s->mv[dir][i][0];
2618                         motion_y = s->mv[dir][i][1];
2619                     }
2620
2621                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2622                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2623                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2624                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2625                     s->current_picture.ref_index [dir][xy    ]=
2626                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2627                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2628                 }
2629                 xy += wrap;
2630             }
2631         }
2632
2633         s->dest[0] += 16 >> lowres;
2634         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2635         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2636
2637         MPV_decode_mb(s, s->block);
2638         
2639         if (++s->mb_x >= s->mb_width) {
2640             const int mb_size= 16>>s->avctx->lowres;
2641
2642             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2643
2644             s->mb_x = 0;
2645             s->mb_y++;
2646
2647             if(s->mb_y<<field_pic >= s->mb_height){
2648                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2649
2650                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2651                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2652                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2653                     return -1;
2654                 }else
2655                     goto eos;
2656             }
2657             
2658             ff_init_block_index(s);
2659         }
2660
2661         /* skip mb handling */
2662         if (s->mb_skip_run == -1) {
2663             /* read again increment */
2664             s->mb_skip_run = 0;
2665             for(;;) {
2666                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2667                 if (code < 0){
2668                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2669                     return -1;
2670                 }
2671                 if (code >= 33) {
2672                     if (code == 33) {
2673                         s->mb_skip_run += 33;
2674                     }else if(code == 35){
2675                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2676                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2677                             return -1;
2678                         }
2679                         goto eos; /* end of slice */
2680                     }
2681                     /* otherwise, stuffing, nothing to do */
2682                 } else {
2683                     s->mb_skip_run += code;
2684                     break;
2685                 }
2686             }
2687         }
2688     }
2689 eos: // end of slice
2690     *buf += get_bits_count(&s->gb)/8 - 1;
2691 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2692     return 0;
2693 }
2694
2695 static int slice_decode_thread(AVCodecContext *c, void *arg){
2696     MpegEncContext *s= arg;
2697     const uint8_t *buf= s->gb.buffer;
2698     int mb_y= s->start_mb_y;
2699
2700     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2701
2702     for(;;){
2703         int start_code, ret;
2704
2705         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2706         emms_c();
2707 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2708 //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);
2709         if(ret < 0){
2710             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2711                 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);
2712         }else{
2713             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);
2714         }
2715         
2716         if(s->mb_y == s->end_mb_y)
2717             return 0;
2718         
2719         start_code = find_start_code(&buf, s->gb.buffer_end);
2720         mb_y= start_code - SLICE_MIN_START_CODE;
2721         if(mb_y < 0 || mb_y >= s->end_mb_y)
2722             return -1;
2723     }
2724     
2725     return 0; //not reached
2726 }
2727
2728 /**
2729  * handles slice ends.
2730  * @return 1 if it seems to be the last slice of 
2731  */
2732 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2733 {
2734     Mpeg1Context *s1 = avctx->priv_data;
2735     MpegEncContext *s = &s1->mpeg_enc_ctx;
2736        
2737     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2738         return 0;
2739
2740 #ifdef HAVE_XVMC
2741     if(s->avctx->xvmc_acceleration)
2742         XVMC_field_end(s);
2743 #endif
2744     /* end of slice reached */
2745     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2746         /* end of image */
2747
2748         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2749
2750         ff_er_frame_end(s);
2751
2752         MPV_frame_end(s);
2753
2754         if (s->pict_type == B_TYPE || s->low_delay) {
2755             *pict= *(AVFrame*)s->current_picture_ptr;
2756             ff_print_debug_info(s, pict);
2757         } else {
2758             s->picture_number++;
2759             /* latency of 1 frame for I and P frames */
2760             /* XXX: use another variable than picture_number */
2761             if (s->last_picture_ptr != NULL) {
2762                 *pict= *(AVFrame*)s->last_picture_ptr;
2763                  ff_print_debug_info(s, pict);
2764             }
2765         }
2766
2767         return 1;
2768     } else {
2769         return 0;
2770     }
2771 }
2772
2773 static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2774                                  const uint8_t *buf, int buf_size)
2775 {
2776     Mpeg1Context *s1 = avctx->priv_data;
2777     MpegEncContext *s = &s1->mpeg_enc_ctx;
2778     int width,height;
2779     int i, v, j;
2780
2781     init_get_bits(&s->gb, buf, buf_size*8);
2782
2783     width = get_bits(&s->gb, 12);
2784     height = get_bits(&s->gb, 12);
2785     if (width <= 0 || height <= 0 ||
2786         (width % 2) != 0 || (height % 2) != 0)
2787         return -1;
2788     s->aspect_ratio_info= get_bits(&s->gb, 4);
2789     if (s->aspect_ratio_info == 0)
2790         return -1;
2791     s->frame_rate_index = get_bits(&s->gb, 4);
2792     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2793         return -1;
2794     s->bit_rate = get_bits(&s->gb, 18) * 400;
2795     if (get_bits1(&s->gb) == 0) /* marker */
2796         return -1;
2797     s->width = width;
2798     s->height = height;
2799
2800     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2801     skip_bits(&s->gb, 1);
2802
2803     /* get matrix */
2804     if (get_bits1(&s->gb)) {
2805         for(i=0;i<64;i++) {
2806             v = get_bits(&s->gb, 8);
2807             if(v==0){
2808                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2809                 return -1;
2810             }
2811             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2812             s->intra_matrix[j] = v;
2813             s->chroma_intra_matrix[j] = v;
2814         }
2815 #ifdef DEBUG
2816         dprintf("intra matrix present\n");
2817         for(i=0;i<64;i++)
2818             dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2819         printf("\n");
2820 #endif
2821     } else {
2822         for(i=0;i<64;i++) {
2823             j = s->dsp.idct_permutation[i];
2824             v = ff_mpeg1_default_intra_matrix[i];
2825             s->intra_matrix[j] = v;
2826             s->chroma_intra_matrix[j] = v;
2827         }
2828     }
2829     if (get_bits1(&s->gb)) {
2830         for(i=0;i<64;i++) {
2831             v = get_bits(&s->gb, 8);
2832             if(v==0){
2833                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2834                 return -1;
2835             }
2836             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2837             s->inter_matrix[j] = v;
2838             s->chroma_inter_matrix[j] = v;
2839         }
2840 #ifdef DEBUG
2841         dprintf("non intra matrix present\n");
2842         for(i=0;i<64;i++)
2843             dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2844         printf("\n");
2845 #endif
2846     } else {
2847         for(i=0;i<64;i++) {
2848             int j= s->dsp.idct_permutation[i];
2849             v = ff_mpeg1_default_non_intra_matrix[i];
2850             s->inter_matrix[j] = v;
2851             s->chroma_inter_matrix[j] = v;
2852         }
2853     }
2854     
2855     if(show_bits(&s->gb, 23) != 0){
2856         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2857         return -1;
2858     }
2859
2860     /* we set mpeg2 parameters so that it emulates mpeg1 */
2861     s->progressive_sequence = 1;
2862     s->progressive_frame = 1;
2863     s->picture_structure = PICT_FRAME;
2864     s->frame_pred_frame_dct = 1;
2865     s->chroma_format = 1;
2866     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2867     avctx->sub_id = 1; /* indicates mpeg1 */
2868     s->out_format = FMT_MPEG1;
2869     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2870     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2871     
2872     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2873         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2874                s->avctx->rc_buffer_size, s->bit_rate);
2875     
2876     return 0;
2877 }
2878
2879 static int vcr2_init_sequence(AVCodecContext *avctx)
2880 {
2881     Mpeg1Context *s1 = avctx->priv_data;
2882     MpegEncContext *s = &s1->mpeg_enc_ctx;
2883     int i, v;
2884
2885     /* start new mpeg1 context decoding */
2886     s->out_format = FMT_MPEG1;
2887     if (s1->mpeg_enc_ctx_allocated) {
2888         MPV_common_end(s);
2889     }
2890     s->width  = avctx->coded_width;
2891     s->height = avctx->coded_height;
2892     avctx->has_b_frames= 0; //true?
2893     s->low_delay= 1;
2894
2895     if(avctx->xvmc_acceleration){
2896         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2897     }else{
2898         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2899     }
2900
2901     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2902         if( avctx->idct_algo == FF_IDCT_AUTO )
2903             avctx->idct_algo = FF_IDCT_SIMPLE;
2904     
2905     if (MPV_common_init(s) < 0)
2906         return -1;
2907     exchange_uv(s);//common init reset pblocks, so we swap them here
2908     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2909     s1->mpeg_enc_ctx_allocated = 1;
2910
2911     for(i=0;i<64;i++) {
2912         int j= s->dsp.idct_permutation[i];
2913         v = ff_mpeg1_default_intra_matrix[i];
2914         s->intra_matrix[j] = v;
2915         s->chroma_intra_matrix[j] = v;
2916
2917         v = ff_mpeg1_default_non_intra_matrix[i];
2918         s->inter_matrix[j] = v;
2919         s->chroma_inter_matrix[j] = v;
2920     }
2921
2922     s->progressive_sequence = 1;
2923     s->progressive_frame = 1;
2924     s->picture_structure = PICT_FRAME;
2925     s->frame_pred_frame_dct = 1;
2926     s->chroma_format = 1;
2927     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2928     avctx->sub_id = 2; /* indicates mpeg2 */
2929     return 0;
2930 }
2931
2932
2933 static void mpeg_decode_user_data(AVCodecContext *avctx, 
2934                                   const uint8_t *buf, int buf_size)
2935 {
2936     const uint8_t *p;
2937     int len, flags;
2938     p = buf;
2939     len = buf_size;
2940
2941     /* we parse the DTG active format information */
2942     if (len >= 5 &&
2943         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2944         flags = p[4];
2945         p += 5;
2946         len -= 5;
2947         if (flags & 0x80) {
2948             /* skip event id */
2949             if (len < 2)
2950                 return;
2951             p += 2;
2952             len -= 2;
2953         }
2954         if (flags & 0x40) {
2955             if (len < 1)
2956                 return;
2957             avctx->dtg_active_format = p[0] & 0x0f;
2958         }
2959     }
2960 }
2961
2962 static void mpeg_decode_gop(AVCodecContext *avctx, 
2963                             const uint8_t *buf, int buf_size){
2964     Mpeg1Context *s1 = avctx->priv_data;
2965     MpegEncContext *s = &s1->mpeg_enc_ctx;
2966
2967     int drop_frame_flag;
2968     int time_code_hours, time_code_minutes;
2969     int time_code_seconds, time_code_pictures;
2970     int broken_link;
2971
2972     init_get_bits(&s->gb, buf, buf_size*8);
2973
2974     drop_frame_flag = get_bits1(&s->gb);
2975     
2976     time_code_hours=get_bits(&s->gb,5);
2977     time_code_minutes = get_bits(&s->gb,6);
2978     skip_bits1(&s->gb);//marker bit
2979     time_code_seconds = get_bits(&s->gb,6);
2980     time_code_pictures = get_bits(&s->gb,6);
2981
2982     /*broken_link indicate that after editing the
2983       reference frames of the first B-Frames after GOP I-Frame
2984       are missing (open gop)*/
2985     broken_link = get_bits1(&s->gb);
2986
2987     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2988         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2989             time_code_hours, time_code_minutes, time_code_seconds,
2990             time_code_pictures, broken_link);
2991 }
2992 /**
2993  * finds the end of the current frame in the bitstream.
2994  * @return the position of the first byte of the next frame, or -1
2995  */
2996 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2997 {
2998     int i;
2999     uint32_t state;
3000     
3001     state= pc->state;
3002     
3003     i=0;
3004     if(!pc->frame_start_found){
3005         for(i=0; i<buf_size; i++){
3006             state= (state<<8) | buf[i];
3007             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3008                 i++;
3009                 pc->frame_start_found=1;
3010                 break;
3011             }
3012         }
3013     }
3014     
3015     if(pc->frame_start_found){
3016         /* EOF considered as end of frame */
3017         if (buf_size == 0)
3018             return 0;
3019         for(; i<buf_size; i++){
3020             state= (state<<8) | buf[i];
3021             if((state&0xFFFFFF00) == 0x100){
3022                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3023                     pc->frame_start_found=0;
3024                     pc->state=-1; 
3025                     return i-3;
3026                 }
3027             }
3028         }
3029     }        
3030     pc->state= state;
3031     return END_NOT_FOUND;
3032 }
3033
3034 /* handle buffering and image synchronisation */
3035 static int mpeg_decode_frame(AVCodecContext *avctx, 
3036                              void *data, int *data_size,
3037                              uint8_t *buf, int buf_size)
3038 {
3039     Mpeg1Context *s = avctx->priv_data;
3040     const uint8_t *buf_end;
3041     const uint8_t *buf_ptr;
3042     int ret, start_code, input_size;
3043     AVFrame *picture = data;
3044     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3045     dprintf("fill_buffer\n");
3046
3047     if (buf_size == 0) {
3048         /* special case for last picture */
3049         if (s2->low_delay==0 && s2->next_picture_ptr) {
3050             *picture= *(AVFrame*)s2->next_picture_ptr;
3051             s2->next_picture_ptr= NULL;
3052
3053             *data_size = sizeof(AVFrame);
3054         }
3055         return 0;
3056     }
3057
3058     if(s2->flags&CODEC_FLAG_TRUNCATED){
3059         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3060         
3061         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3062             return buf_size;
3063     }    
3064     
3065     buf_ptr = buf;
3066     buf_end = buf + buf_size;
3067
3068 #if 0    
3069     if (s->repeat_field % 2 == 1) { 
3070         s->repeat_field++;
3071         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3072         //        s2->picture_number, s->repeat_field);
3073         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3074             *data_size = sizeof(AVPicture);
3075             goto the_end;
3076         }
3077     }
3078 #endif
3079
3080     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3081         vcr2_init_sequence(avctx);
3082     
3083     s->slice_count= 0;
3084         
3085     for(;;) {
3086         /* find start next code */
3087         start_code = find_start_code(&buf_ptr, buf_end);
3088         if (start_code < 0){
3089             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3090                 if(avctx->thread_count > 1){
3091                     int i;
3092
3093                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3094                     for(i=0; i<s->slice_count; i++)
3095                         s2->error_count += s2->thread_context[i]->error_count;
3096                 }
3097                 if (slice_end(avctx, picture)) {
3098                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3099                         *data_size = sizeof(AVPicture);
3100                 }
3101             }
3102             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3103         }
3104         
3105         input_size = buf_end - buf_ptr;
3106
3107         if(avctx->debug & FF_DEBUG_STARTCODE){
3108             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3109         }
3110
3111                 /* prepare data for next start code */
3112                 switch(start_code) {
3113                 case SEQ_START_CODE:
3114                     mpeg1_decode_sequence(avctx, buf_ptr, 
3115                                           input_size);
3116                     break;
3117                             
3118                 case PICTURE_START_CODE:
3119                     /* we have a complete image : we try to decompress it */
3120                     mpeg1_decode_picture(avctx, 
3121                                          buf_ptr, input_size);
3122                     break;
3123                 case EXT_START_CODE:
3124                     mpeg_decode_extension(avctx,
3125                                           buf_ptr, input_size);
3126                     break;
3127                 case USER_START_CODE:
3128                     mpeg_decode_user_data(avctx, 
3129                                           buf_ptr, input_size);
3130                     break;
3131                 case GOP_START_CODE:
3132                     s2->first_field=0;
3133                     mpeg_decode_gop(avctx, 
3134                                           buf_ptr, input_size);
3135                     break;
3136                 default:
3137                     if (start_code >= SLICE_MIN_START_CODE &&
3138                         start_code <= SLICE_MAX_START_CODE) {
3139                         int mb_y= start_code - SLICE_MIN_START_CODE;
3140                         
3141                         if(s2->last_picture_ptr==NULL){
3142                         /* skip b frames if we dont have reference frames */
3143                             if(s2->pict_type==B_TYPE) break;
3144                         /* skip P frames if we dont have reference frame no valid header */
3145                             if(s2->pict_type==P_TYPE && !s2->first_slice) break;
3146                         }
3147                         /* skip b frames if we are in a hurry */
3148                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3149                         if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3150                            ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3151                            || avctx->skip_frame >= AVDISCARD_ALL)
3152                             break;
3153                         /* skip everything if we are in a hurry>=5 */
3154                         if(avctx->hurry_up>=5) break;
3155                         
3156                         if (!s->mpeg_enc_ctx_allocated) break;
3157
3158                         if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3159                             if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3160                                 break;
3161                         }
3162                         
3163                         if(s2->first_slice){
3164                             s2->first_slice=0;
3165                             if(mpeg_field_start(s2) < 0)
3166                                 return -1;
3167                         }
3168                         
3169                         if(avctx->thread_count > 1){
3170                             int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3171                             if(threshold <= mb_y){
3172                                 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3173                                 
3174                                 thread_context->start_mb_y= mb_y;
3175                                 thread_context->end_mb_y  = s2->mb_height;
3176                                 if(s->slice_count){
3177                                     s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3178                                     ff_update_duplicate_context(thread_context, s2);
3179                                 }
3180                                 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3181                                 s->slice_count++;
3182                             }
3183                             buf_ptr += 2; //FIXME add minimum num of bytes per slice
3184                         }else{
3185                             ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3186                             emms_c();
3187
3188                             if(ret < 0){
3189                                 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3190                                     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);
3191                             }else{
3192                                 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);
3193                             }
3194                         }
3195                     }
3196                     break;
3197                 }
3198     }
3199 }
3200
3201 static int mpeg_decode_end(AVCodecContext *avctx)
3202 {
3203     Mpeg1Context *s = avctx->priv_data;
3204
3205     if (s->mpeg_enc_ctx_allocated)
3206         MPV_common_end(&s->mpeg_enc_ctx);
3207     return 0;
3208 }
3209
3210 AVCodec mpeg1video_decoder = {
3211     "mpeg1video",
3212     CODEC_TYPE_VIDEO,
3213     CODEC_ID_MPEG1VIDEO,
3214     sizeof(Mpeg1Context),
3215     mpeg_decode_init,
3216     NULL,
3217     mpeg_decode_end,
3218     mpeg_decode_frame,
3219     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3220     .flush= ff_mpeg_flush,
3221 };
3222
3223 AVCodec mpeg2video_decoder = {
3224     "mpeg2video",
3225     CODEC_TYPE_VIDEO,
3226     CODEC_ID_MPEG2VIDEO,
3227     sizeof(Mpeg1Context),
3228     mpeg_decode_init,
3229     NULL,
3230     mpeg_decode_end,
3231     mpeg_decode_frame,
3232     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3233     .flush= ff_mpeg_flush,
3234 };
3235
3236 //legacy decoder
3237 AVCodec mpegvideo_decoder = {
3238     "mpegvideo",
3239     CODEC_TYPE_VIDEO,
3240     CODEC_ID_MPEG2VIDEO,
3241     sizeof(Mpeg1Context),
3242     mpeg_decode_init,
3243     NULL,
3244     mpeg_decode_end,
3245     mpeg_decode_frame,
3246     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3247     .flush= ff_mpeg_flush,
3248 };
3249
3250 #ifdef CONFIG_ENCODERS
3251
3252 AVCodec mpeg1video_encoder = {
3253     "mpeg1video",
3254     CODEC_TYPE_VIDEO,
3255     CODEC_ID_MPEG1VIDEO,
3256     sizeof(MpegEncContext),
3257     encode_init,
3258     MPV_encode_picture,
3259     MPV_encode_end,
3260     .supported_framerates= frame_rate_tab+1,
3261     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3262     .capabilities= CODEC_CAP_DELAY,
3263 };
3264
3265 AVCodec mpeg2video_encoder = {
3266     "mpeg2video",
3267     CODEC_TYPE_VIDEO,
3268     CODEC_ID_MPEG2VIDEO,
3269     sizeof(MpegEncContext),
3270     encode_init,
3271     MPV_encode_picture,
3272     MPV_encode_end,
3273     .supported_framerates= frame_rate_tab+1,
3274     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3275     .capabilities= CODEC_CAP_DELAY,
3276 };
3277 #endif
3278
3279 #ifdef HAVE_XVMC
3280 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3281     Mpeg1Context *s;
3282
3283     if( avctx->thread_count > 1) 
3284         return -1;
3285     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3286         return -1;
3287     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3288         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3289     }
3290     mpeg_decode_init(avctx);
3291     s = avctx->priv_data;
3292
3293     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3294     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3295
3296     return 0;
3297 }
3298
3299 AVCodec mpeg_xvmc_decoder = {
3300     "mpegvideo_xvmc",
3301     CODEC_TYPE_VIDEO,
3302     CODEC_ID_MPEG2VIDEO_XVMC,
3303     sizeof(Mpeg1Context),
3304     mpeg_mc_decode_init,
3305     NULL,
3306     mpeg_decode_end,
3307     mpeg_decode_frame,
3308     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3309     .flush= ff_mpeg_flush,
3310 };
3311
3312 #endif
3313
3314 /* this is ugly i know, but the alternative is too make 
3315    hundreds of vars global and prefix them with ff_mpeg1_
3316    which is far uglier. */
3317 #include "mdec.c"