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