initial chroma_format changes,xvmc tweaks and codec_cap
[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 mpeg2_decode_block_non_intra(MpegEncContext *s, 
68                                         DCTELEM *block, 
69                                         int n);
70 static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
71                                     DCTELEM *block, 
72                                     int n);
73 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
74 static void exchange_uv(MpegEncContext *s);
75
76 #ifdef HAVE_XVMC
77 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
78 extern int XVMC_field_end(MpegEncContext *s);
79 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
80 extern void XVMC_init_block(MpegEncContext *s);//set s->block
81 #endif
82
83 const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
84 const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
85 const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
86 const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
87                                            PIX_FMT_XVMC_MPEG2_IDCT,
88                                            PIX_FMT_XVMC_MPEG2_MC,
89                                            -1};
90 #ifdef CONFIG_ENCODERS
91 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
92 static uint8_t fcode_tab[MAX_MV*2+1];
93
94 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
95 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
96
97 /* simple include everything table for dc, first byte is bits number next 3 are code*/
98 static uint32_t mpeg1_lum_dc_uni[512];
99 static uint32_t mpeg1_chr_dc_uni[512];
100
101 static uint8_t mpeg1_index_run[2][64];
102 static int8_t mpeg1_max_level[2][64];
103 #endif //CONFIG_ENCODERS
104
105 static void init_2d_vlc_rl(RLTable *rl)
106 {
107     int i;
108     
109     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
110              &rl->table_vlc[0][1], 4, 2,
111              &rl->table_vlc[0][0], 4, 2);
112
113     
114     rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
115     for(i=0; i<rl->vlc.table_size; i++){
116         int code= rl->vlc.table[i][0];
117         int len = rl->vlc.table[i][1];
118         int level, run;
119     
120         if(len==0){ // illegal code
121             run= 65;
122             level= MAX_LEVEL;
123         }else if(len<0){ //more bits needed
124             run= 0;
125             level= code;
126         }else{
127             if(code==rl->n){ //esc
128                 run= 65;
129                 level= 0;
130             }else if(code==rl->n+1){ //eob
131                 run= 0;
132                 level= 127;
133             }else{
134                 run=   rl->table_run  [code] + 1;
135                 level= rl->table_level[code];
136             }
137         }
138         rl->rl_vlc[0][i].len= len;
139         rl->rl_vlc[0][i].level= level;
140         rl->rl_vlc[0][i].run= run;
141     }
142 }
143
144 #ifdef CONFIG_ENCODERS
145 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
146     int i;
147
148     for(i=0; i<128; i++){
149         int level= i-64;
150         int run;
151         for(run=0; run<64; run++){
152             int len, bits, code;
153             
154             int alevel= ABS(level);
155             int sign= (level>>31)&1;
156
157             if (alevel > rl->max_level[0][run])
158                 code= 111; /*rl->n*/
159             else
160                 code= rl->index_run[0][run] + alevel - 1;
161
162             if (code < 111 /* rl->n */) {
163                 /* store the vlc & sign at once */
164                 len=   mpeg1_vlc[code][1]+1;
165                 bits= (mpeg1_vlc[code][0]<<1) + sign;
166             } else {
167                 len=  mpeg1_vlc[111/*rl->n*/][1]+6;
168                 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
169
170                 bits|= run;
171                 if (alevel < 128) {
172                     bits<<=8; len+=8;
173                     bits|= level & 0xff;
174                 } else {
175                     bits<<=16; len+=16;
176                     bits|= level & 0xff;
177                     if (level < 0) {
178                         bits|= 0x8001 + level + 255;
179                     } else {
180                         bits|= level & 0xffff;
181                     }
182                 }
183             }
184
185             uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
186             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
187         }
188     }
189 }
190
191
192 static int find_frame_rate_index(MpegEncContext *s){
193     int i;
194     int64_t dmin= INT64_MAX;
195     int64_t d;
196
197     for(i=1;i<14;i++) {
198         int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->frame_rate_base;
199         int64_t n1= 1001LL*s->avctx->frame_rate;
200         if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
201
202         d = ABS(n0 - n1);
203         if(d < dmin){
204             dmin=d;
205             s->frame_rate_index= i;
206         }
207     }
208     if(dmin)
209         return -1;
210     else
211         return 0;
212 }
213
214 static int encode_init(AVCodecContext *avctx)
215 {
216     MpegEncContext *s = avctx->priv_data;
217
218     if(MPV_encode_init(avctx) < 0)
219         return -1;
220
221     if(find_frame_rate_index(s) < 0){
222         if(s->strict_std_compliance >=0){
223             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 doesnt support %d/%d fps\n", avctx->frame_rate, avctx->frame_rate_base);
224             return -1;
225         }else{
226             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);
227         }
228     }
229     
230     return 0;
231 }
232
233 static void put_header(MpegEncContext *s, int header)
234 {
235     align_put_bits(&s->pb);
236     put_bits(&s->pb, 16, header>>16);
237     put_bits(&s->pb, 16, header&0xFFFF);
238 }
239
240 /* put sequence header if needed */
241 static void mpeg1_encode_sequence_header(MpegEncContext *s)
242 {
243         unsigned int vbv_buffer_size;
244         unsigned int fps, v;
245         int n, i;
246         uint64_t time_code;
247         float best_aspect_error= 1E10;
248         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
249         int constraint_parameter_flag;
250         
251         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
252         
253         if (s->current_picture.key_frame) {
254             AVRational framerate= frame_rate_tab[s->frame_rate_index];
255
256             /* mpeg1 header repeated every gop */
257             put_header(s, SEQ_START_CODE);
258  
259             put_bits(&s->pb, 12, s->width);
260             put_bits(&s->pb, 12, s->height);
261             
262             for(i=1; i<15; i++){
263                 float error= aspect_ratio;
264                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
265                     error-= 1.0/mpeg1_aspect[i];
266                 else
267                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
268              
269                 error= ABS(error);
270                 
271                 if(error < best_aspect_error){
272                     best_aspect_error= error;
273                     s->aspect_ratio_info= i;
274                 }
275             }
276             
277             put_bits(&s->pb, 4, s->aspect_ratio_info);
278             put_bits(&s->pb, 4, s->frame_rate_index);
279             
280             if(s->avctx->rc_max_rate){
281                 v = (s->avctx->rc_max_rate + 399) / 400;
282                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
283                     v = 0x3ffff;
284             }else{
285                 v= 0x3FFFF;
286             }
287
288             if(s->avctx->rc_buffer_size)
289                 vbv_buffer_size = s->avctx->rc_buffer_size;
290             else
291                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
292                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
293             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
294
295             put_bits(&s->pb, 18, v & 0x3FFFF);
296             put_bits(&s->pb, 1, 1); /* marker */
297             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
298
299             constraint_parameter_flag= 
300                 s->width <= 768 && s->height <= 576 && 
301                 s->mb_width * s->mb_height <= 396 &&
302                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
303                 framerate.num <= framerate.den*30 &&
304                 vbv_buffer_size <= 20 &&
305                 v <= 1856000/400 &&
306                 s->codec_id == CODEC_ID_MPEG1VIDEO;
307                 
308             put_bits(&s->pb, 1, constraint_parameter_flag);
309             
310             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
311             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
312
313             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
314                 put_header(s, EXT_START_CODE);
315                 put_bits(&s->pb, 4, 1); //seq ext
316                 put_bits(&s->pb, 1, 0); //esc
317                 put_bits(&s->pb, 3, 4); //profile
318                 put_bits(&s->pb, 4, 8); //level
319                 put_bits(&s->pb, 1, s->progressive_sequence);
320                 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
321                 put_bits(&s->pb, 2, 0); //horizontal size ext
322                 put_bits(&s->pb, 2, 0); //vertical size ext
323                 put_bits(&s->pb, 12, v>>18); //bitrate ext
324                 put_bits(&s->pb, 1, 1); //marker
325                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
326                 put_bits(&s->pb, 1, s->low_delay);
327                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
328                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
329             }
330             
331             put_header(s, GOP_START_CODE);
332             put_bits(&s->pb, 1, 0); /* do drop frame */
333             /* time code : we must convert from the real frame rate to a
334                fake mpeg frame rate in case of low frame rate */
335             fps = (framerate.num + framerate.den/2)/ framerate.den;
336             time_code = s->current_picture_ptr->coded_picture_number;
337
338             s->gop_picture_number = time_code;
339             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
340             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
341             put_bits(&s->pb, 1, 1);
342             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
343             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
344             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
345             put_bits(&s->pb, 1, 0); /* broken link */
346         }
347 }
348
349 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
350     while (run >= 33) {
351         put_bits(&s->pb, 11, 0x008);
352         run -= 33;
353     }
354     put_bits(&s->pb, mbAddrIncrTable[run][1], 
355              mbAddrIncrTable[run][0]);
356 }
357 #endif //CONFIG_ENCODERS
358
359 static void common_init(MpegEncContext *s)
360 {
361     s->y_dc_scale_table=
362     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
363 }
364
365 void ff_mpeg1_clean_buffers(MpegEncContext *s){
366     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
367     s->last_dc[1] = s->last_dc[0];
368     s->last_dc[2] = s->last_dc[0];
369     memset(s->last_mv, 0, sizeof(s->last_mv));
370 }
371
372 #ifdef CONFIG_ENCODERS
373
374 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
375     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
376     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
377     put_bits(&s->pb, 1, 0); /* slice extra information */
378 }
379
380 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
381 {
382     mpeg1_encode_sequence_header(s);
383
384     /* mpeg1 picture header */
385     put_header(s, PICTURE_START_CODE);
386     /* temporal reference */
387
388     // RAL: s->picture_number instead of s->fake_picture_number
389     put_bits(&s->pb, 10, (s->picture_number - 
390                           s->gop_picture_number) & 0x3ff); 
391     put_bits(&s->pb, 3, s->pict_type);
392
393     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
394     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
395     
396     // RAL: Forward f_code also needed for B frames
397     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
398         put_bits(&s->pb, 1, 0); /* half pel coordinates */
399         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
400             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
401         else
402             put_bits(&s->pb, 3, 7); /* forward_f_code */
403     }
404     
405     // RAL: Backward f_code necessary for B frames
406     if (s->pict_type == B_TYPE) {
407         put_bits(&s->pb, 1, 0); /* half pel coordinates */
408         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
409             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
410         else
411             put_bits(&s->pb, 3, 7); /* backward_f_code */
412     }
413
414     put_bits(&s->pb, 1, 0); /* extra bit picture */
415
416     s->frame_pred_frame_dct = 1;
417     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
418         put_header(s, EXT_START_CODE);
419         put_bits(&s->pb, 4, 8); //pic ext
420         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
421             put_bits(&s->pb, 4, s->f_code);
422             put_bits(&s->pb, 4, s->f_code);
423         }else{
424             put_bits(&s->pb, 8, 255);
425         }
426         if (s->pict_type == B_TYPE) {
427             put_bits(&s->pb, 4, s->b_code);
428             put_bits(&s->pb, 4, s->b_code);
429         }else{
430             put_bits(&s->pb, 8, 255);
431         }
432         put_bits(&s->pb, 2, s->intra_dc_precision);
433         
434         assert(s->picture_structure == PICT_FRAME);
435         put_bits(&s->pb, 2, s->picture_structure);
436         if (s->progressive_sequence) {
437             put_bits(&s->pb, 1, 0); /* no repeat */
438         } else {
439             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
440         }
441         /* XXX: optimize the generation of this flag with entropy
442            measures */
443         s->frame_pred_frame_dct = s->progressive_sequence;
444         
445         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
446         put_bits(&s->pb, 1, s->concealment_motion_vectors);
447         put_bits(&s->pb, 1, s->q_scale_type);
448         put_bits(&s->pb, 1, s->intra_vlc_format);
449         put_bits(&s->pb, 1, s->alternate_scan);
450         put_bits(&s->pb, 1, s->repeat_first_field);
451         put_bits(&s->pb, 1, s->chroma_420_type=1);
452         s->progressive_frame = s->progressive_sequence;
453         put_bits(&s->pb, 1, s->progressive_frame);
454         put_bits(&s->pb, 1, 0); //composite_display_flag
455     }
456     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
457         int i;
458
459         put_header(s, USER_START_CODE);
460         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
461             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
462         }
463     }
464     
465     s->mb_y=0;
466     ff_mpeg1_encode_slice_header(s);
467 }
468
469 static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
470                                 int has_mv, int field_motion)
471 {
472     put_bits(&s->pb, n, bits);
473     if (!s->frame_pred_frame_dct) {
474         if (has_mv) 
475             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
476         put_bits(&s->pb, 1, s->interlaced_dct);
477     }
478 }
479
480 void mpeg1_encode_mb(MpegEncContext *s,
481                      DCTELEM block[6][64],
482                      int motion_x, int motion_y)
483 {
484     int i, cbp;
485     const int mb_x = s->mb_x;
486     const int mb_y = s->mb_y;
487     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
488
489     /* compute cbp */
490     cbp = 0;
491     for(i=0;i<6;i++) {
492         if (s->block_last_index[i] >= 0)
493             cbp |= 1 << (5 - i);
494     }
495     
496     if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
497         ((s->pict_type == P_TYPE && s->mv_type == MV_TYPE_16X16 && (motion_x | motion_y) == 0) ||
498         (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) |
499         ((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))) {
500         s->mb_skip_run++;
501         s->qscale -= s->dquant;
502         s->skip_count++;
503         s->misc_bits++;
504         s->last_bits++;
505         if(s->pict_type == P_TYPE){
506             s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
507             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
508         }
509     } else {
510         if(first_mb){
511             assert(s->mb_skip_run == 0);
512             encode_mb_skip_run(s, s->mb_x);
513         }else{
514             encode_mb_skip_run(s, s->mb_skip_run);
515         }
516         
517         if (s->pict_type == I_TYPE) {
518             if(s->dquant && cbp){
519                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
520                 put_bits(&s->pb, 5, s->qscale);
521             }else{
522                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
523                 s->qscale -= s->dquant;
524             }
525             s->misc_bits+= get_bits_diff(s);
526             s->i_count++;
527         } else if (s->mb_intra) {
528             if(s->dquant && cbp){
529                 put_mb_modes(s, 6, 0x01, 0, 0);
530                 put_bits(&s->pb, 5, s->qscale);
531             }else{
532                 put_mb_modes(s, 5, 0x03, 0, 0);
533                 s->qscale -= s->dquant;
534             }
535             s->misc_bits+= get_bits_diff(s);
536             s->i_count++;
537             memset(s->last_mv, 0, sizeof(s->last_mv));
538         } else if (s->pict_type == P_TYPE) { 
539             if(s->mv_type == MV_TYPE_16X16){
540                 if (cbp != 0) {
541                     if ((motion_x|motion_y) == 0) {
542                         if(s->dquant){
543                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
544                             put_bits(&s->pb, 5, s->qscale);
545                         }else{
546                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
547                         }
548                         s->misc_bits+= get_bits_diff(s);
549                     } else {
550                         if(s->dquant){
551                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
552                             put_bits(&s->pb, 5, s->qscale);
553                         }else{
554                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
555                         }
556                         s->misc_bits+= get_bits_diff(s);
557                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
558                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
559                         s->mv_bits+= get_bits_diff(s);
560                     }
561                 } else {
562                     put_bits(&s->pb, 3, 1); /* motion only */
563                     if (!s->frame_pred_frame_dct)
564                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
565                     s->misc_bits+= get_bits_diff(s);
566                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
567                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
568                     s->qscale -= s->dquant;
569                     s->mv_bits+= get_bits_diff(s);
570                 }
571                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
572                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
573             }else{
574                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
575
576                 if (cbp) {
577                     if(s->dquant){
578                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
579                         put_bits(&s->pb, 5, s->qscale);
580                     }else{
581                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
582                     }
583                 } else {
584                     put_bits(&s->pb, 3, 1); /* motion only */
585                     put_bits(&s->pb, 2, 1); /* motion_type: field */
586                     s->qscale -= s->dquant;
587                 }
588                 s->misc_bits+= get_bits_diff(s);
589                 for(i=0; i<2; i++){
590                     put_bits(&s->pb, 1, s->field_select[0][i]);
591                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
592                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
593                     s->last_mv[0][i][0]=   s->mv[0][i][0];
594                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
595                 }
596                 s->mv_bits+= get_bits_diff(s);
597             }
598             if(cbp)
599                 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
600             s->f_count++;
601         } else{  
602             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
603
604             if(s->mv_type == MV_TYPE_16X16){
605                 if (cbp){    // With coded bloc pattern
606                     if (s->dquant) {
607                         if(s->mv_dir == MV_DIR_FORWARD)
608                             put_mb_modes(s, 6, 3, 1, 0);
609                         else
610                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
611                         put_bits(&s->pb, 5, s->qscale);
612                     } else {
613                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
614                     }
615                 }else{    // No coded bloc pattern
616                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
617                     if (!s->frame_pred_frame_dct)
618                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
619                     s->qscale -= s->dquant;
620                 }
621                 s->misc_bits += get_bits_diff(s);
622                 if (s->mv_dir&MV_DIR_FORWARD){
623                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
624                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
625                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
626                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
627                     s->f_count++;
628                 }
629                 if (s->mv_dir&MV_DIR_BACKWARD){
630                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
631                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
632                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
633                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
634                     s->b_count++;
635                 }
636             }else{
637                 assert(s->mv_type == MV_TYPE_FIELD);
638                 assert(!s->frame_pred_frame_dct);
639                 if (cbp){    // With coded bloc pattern
640                     if (s->dquant) {
641                         if(s->mv_dir == MV_DIR_FORWARD)
642                             put_mb_modes(s, 6, 3, 1, 1);
643                         else
644                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
645                         put_bits(&s->pb, 5, s->qscale);
646                     } else {
647                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
648                     }
649                 }else{    // No coded bloc pattern
650                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
651                     put_bits(&s->pb, 2, 1); /* motion_type: field */
652                     s->qscale -= s->dquant;
653                 }
654                 s->misc_bits += get_bits_diff(s);
655                 if (s->mv_dir&MV_DIR_FORWARD){
656                     for(i=0; i<2; i++){
657                         put_bits(&s->pb, 1, s->field_select[0][i]);
658                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
659                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
660                         s->last_mv[0][i][0]=   s->mv[0][i][0];
661                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
662                     }
663                     s->f_count++;
664                 }
665                 if (s->mv_dir&MV_DIR_BACKWARD){
666                     for(i=0; i<2; i++){
667                         put_bits(&s->pb, 1, s->field_select[1][i]);
668                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
669                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
670                         s->last_mv[1][i][0]=   s->mv[1][i][0];
671                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
672                     }
673                     s->b_count++;
674                 }
675             }
676             s->mv_bits += get_bits_diff(s);
677             if(cbp)
678                 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
679         }
680         for(i=0;i<6;i++) {
681             if (cbp & (1 << (5 - i))) {
682                 mpeg1_encode_block(s, block[i], i);
683             }
684         }
685         s->mb_skip_run = 0;
686         if(s->mb_intra)
687             s->i_tex_bits+= get_bits_diff(s);
688         else
689             s->p_tex_bits+= get_bits_diff(s);
690     }
691 }
692
693 // RAL: Parameter added: f_or_b_code
694 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
695 {
696     int code, bit_size, l, m, bits, range, sign;
697
698     if (val == 0) {
699         /* zero vector */
700         code = 0;
701         put_bits(&s->pb,
702                  mbMotionVectorTable[0][1], 
703                  mbMotionVectorTable[0][0]); 
704     } else {
705         bit_size = f_or_b_code - 1;
706         range = 1 << bit_size;
707         /* modulo encoding */
708         l = 16 * range;
709         m = 2 * l;
710         if (val < -l) {
711             val += m;
712         } else if (val >= l) {
713             val -= m;
714         }
715
716         if (val >= 0) {
717             val--;
718             code = (val >> bit_size) + 1;
719             bits = val & (range - 1);
720             sign = 0;
721         } else {
722             val = -val;
723             val--;
724             code = (val >> bit_size) + 1;
725             bits = val & (range - 1);
726             sign = 1;
727         }
728
729         assert(code > 0 && code <= 16);
730
731         put_bits(&s->pb,
732                  mbMotionVectorTable[code][1], 
733                  mbMotionVectorTable[code][0]); 
734
735         put_bits(&s->pb, 1, sign);
736         if (bit_size > 0) {
737             put_bits(&s->pb, bit_size, bits);
738         }
739     }
740 }
741
742 void ff_mpeg1_encode_init(MpegEncContext *s)
743 {
744     static int done=0;
745
746     common_init(s);
747
748     if(!done){
749         int f_code;
750         int mv;
751         int i;
752
753         done=1;
754         init_rl(&rl_mpeg1);
755
756         for(i=0; i<64; i++)
757         {
758                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
759                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
760         }
761         
762         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
763
764         /* build unified dc encoding tables */
765         for(i=-255; i<256; i++)
766         {
767                 int adiff, index;
768                 int bits, code;
769                 int diff=i;
770
771                 adiff = ABS(diff);
772                 if(diff<0) diff--;
773                 index = vlc_dc_table[adiff];
774
775                 bits= vlc_dc_lum_bits[index] + index;
776                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
777                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
778                 
779                 bits= vlc_dc_chroma_bits[index] + index;
780                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
781                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
782         }
783
784         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
785
786         for(f_code=1; f_code<=MAX_FCODE; f_code++){
787             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
788                 int len;
789
790                 if(mv==0) len= mbMotionVectorTable[0][1];
791                 else{
792                     int val, bit_size, range, code;
793
794                     bit_size = s->f_code - 1;
795                     range = 1 << bit_size;
796
797                     val=mv;
798                     if (val < 0) 
799                         val = -val;
800                     val--;
801                     code = (val >> bit_size) + 1;
802                     if(code<17){
803                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
804                     }else{
805                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
806                     }
807                 }
808
809                 mv_penalty[f_code][mv+MAX_MV]= len;
810             }
811         }
812         
813
814         for(f_code=MAX_FCODE; f_code>0; f_code--){
815             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
816                 fcode_tab[mv+MAX_MV]= f_code;
817             }
818         }
819     }
820     s->me.mv_penalty= mv_penalty;
821     s->fcode_tab= fcode_tab;
822     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
823         s->min_qcoeff=-255;
824         s->max_qcoeff= 255;
825     }else{
826         s->min_qcoeff=-2047;
827         s->max_qcoeff= 2047;
828     }
829     s->intra_ac_vlc_length=
830     s->inter_ac_vlc_length=
831     s->intra_ac_vlc_last_length=
832     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
833 }
834
835 static inline void encode_dc(MpegEncContext *s, int diff, int component)
836 {
837     if (component == 0) {
838         put_bits(
839             &s->pb, 
840             mpeg1_lum_dc_uni[diff+255]&0xFF,
841             mpeg1_lum_dc_uni[diff+255]>>8);
842     } else {
843         put_bits(
844             &s->pb, 
845             mpeg1_chr_dc_uni[diff+255]&0xFF,
846             mpeg1_chr_dc_uni[diff+255]>>8);
847     }
848 }
849
850 static void mpeg1_encode_block(MpegEncContext *s, 
851                                DCTELEM *block, 
852                                int n)
853 {
854     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
855     int code, component;
856 //    RLTable *rl = &rl_mpeg1;
857
858     last_index = s->block_last_index[n];
859
860     /* DC coef */
861     if (s->mb_intra) {
862         component = (n <= 3 ? 0 : n - 4 + 1);
863         dc = block[0]; /* overflow is impossible */
864         diff = dc - s->last_dc[component];
865         encode_dc(s, diff, component);
866         s->last_dc[component] = dc;
867         i = 1;
868 /*
869         if (s->intra_vlc_format)
870             rl = &rl_mpeg2;
871         else
872             rl = &rl_mpeg1;
873 */
874     } else {
875         /* encode the first coefficient : needs to be done here because
876            it is handled slightly differently */
877         level = block[0];
878         if (abs(level) == 1) {
879                 code = ((uint32_t)level >> 31); /* the sign bit */
880                 put_bits(&s->pb, 2, code | 0x02);
881                 i = 1;
882         } else {
883             i = 0;
884             last_non_zero = -1;
885             goto next_coef;
886         }
887     }
888
889     /* now quantify & encode AC coefs */
890     last_non_zero = i - 1;
891
892     for(;i<=last_index;i++) {
893         j = s->intra_scantable.permutated[i];
894         level = block[j];
895     next_coef:
896 #if 0
897         if (level != 0)
898             dprintf("level[%d]=%d\n", i, level);
899 #endif            
900         /* encode using VLC */
901         if (level != 0) {
902             run = i - last_non_zero - 1;
903             
904             alevel= level;
905             MASK_ABS(sign, alevel)
906             sign&=1;
907
908 //            code = get_rl_index(rl, 0, run, alevel);
909             if (alevel <= mpeg1_max_level[0][run]){
910                 code= mpeg1_index_run[0][run] + alevel - 1;
911                 /* store the vlc & sign at once */
912                 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
913             } else {
914                 /* escape seems to be pretty rare <5% so i dont optimize it */
915                 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
916                 /* escape: only clip in this case */
917                 put_bits(&s->pb, 6, run);
918                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
919                     if (alevel < 128) {
920                         put_bits(&s->pb, 8, level & 0xff);
921                     } else {
922                         if (level < 0) {
923                             put_bits(&s->pb, 16, 0x8001 + level + 255);
924                         } else {
925                             put_bits(&s->pb, 16, level & 0xffff);
926                         }
927                     }
928                 }else{
929                     put_bits(&s->pb, 12, level & 0xfff);
930                 }
931             }
932             last_non_zero = i;
933         }
934     }
935     /* end of block */
936     put_bits(&s->pb, 2, 0x2);
937 }
938 #endif //CONFIG_ENCODERS
939
940 /******************************************/
941 /* decoding */
942
943 static VLC dc_lum_vlc;
944 static VLC dc_chroma_vlc;
945 static VLC mv_vlc;
946 static VLC mbincr_vlc;
947 static VLC mb_ptype_vlc;
948 static VLC mb_btype_vlc;
949 static VLC mb_pat_vlc;
950
951 static void init_vlcs()
952 {
953     static int done = 0;
954
955     if (!done) {
956         done = 1;
957
958         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
959                  vlc_dc_lum_bits, 1, 1,
960                  vlc_dc_lum_code, 2, 2);
961         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
962                  vlc_dc_chroma_bits, 1, 1,
963                  vlc_dc_chroma_code, 2, 2);
964         init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
965                  &mbMotionVectorTable[0][1], 2, 1,
966                  &mbMotionVectorTable[0][0], 2, 1);
967         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
968                  &mbAddrIncrTable[0][1], 2, 1,
969                  &mbAddrIncrTable[0][0], 2, 1);
970         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63, 
971                  &mbPatTable[0][1], 2, 1,
972                  &mbPatTable[0][0], 2, 1);
973         
974         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
975                  &table_mb_ptype[0][1], 2, 1,
976                  &table_mb_ptype[0][0], 2, 1);
977         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
978                  &table_mb_btype[0][1], 2, 1,
979                  &table_mb_btype[0][0], 2, 1);
980         init_rl(&rl_mpeg1);
981         init_rl(&rl_mpeg2);
982
983         init_2d_vlc_rl(&rl_mpeg1);
984         init_2d_vlc_rl(&rl_mpeg2);
985     }
986 }
987
988 static inline int get_dmv(MpegEncContext *s)
989 {
990     if(get_bits1(&s->gb)) 
991         return 1 - (get_bits1(&s->gb) << 1);
992     else
993         return 0;
994 }
995
996 static inline int get_qscale(MpegEncContext *s)
997 {
998     int qscale = get_bits(&s->gb, 5);
999     if (s->q_scale_type) {
1000         return non_linear_qscale[qscale];
1001     } else {
1002         return qscale << 1;
1003     }
1004 }
1005
1006 /* motion type (for mpeg2) */
1007 #define MT_FIELD 1
1008 #define MT_FRAME 2
1009 #define MT_16X8  2
1010 #define MT_DMV   3
1011
1012 static int mpeg_decode_mb(MpegEncContext *s,
1013                           DCTELEM block[12][64])
1014 {
1015     int i, j, k, cbp, val, mb_type, motion_type;
1016     
1017     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1018
1019     assert(s->mb_skiped==0);
1020
1021     if (s->mb_skip_run-- != 0) {
1022         if(s->pict_type == I_TYPE){
1023             av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1024             return -1;
1025         }
1026     
1027         /* skip mb */
1028         s->mb_intra = 0;
1029         for(i=0;i<12;i++)
1030             s->block_last_index[i] = -1;
1031         if(s->picture_structure == PICT_FRAME)
1032             s->mv_type = MV_TYPE_16X16;
1033         else
1034             s->mv_type = MV_TYPE_FIELD;
1035         if (s->pict_type == P_TYPE) {
1036             /* if P type, zero motion vector is implied */
1037             s->mv_dir = MV_DIR_FORWARD;
1038             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1039             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1040             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1041             s->field_select[0][0]= s->picture_structure - 1;
1042             s->mb_skiped = 1;
1043             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1044         } else {
1045             /* if B type, reuse previous vectors and directions */
1046             s->mv[0][0][0] = s->last_mv[0][0][0];
1047             s->mv[0][0][1] = s->last_mv[0][0][1];
1048             s->mv[1][0][0] = s->last_mv[1][0][0];
1049             s->mv[1][0][1] = s->last_mv[1][0][1];
1050
1051             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1052                 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1053 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1054
1055             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1056                 s->mb_skiped = 1;
1057         }
1058
1059         return 0;
1060     }
1061
1062     switch(s->pict_type) {
1063     default:
1064     case I_TYPE:
1065         if (get_bits1(&s->gb) == 0) {
1066             if (get_bits1(&s->gb) == 0){
1067                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1068                 return -1;
1069             }
1070             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1071         } else {
1072             mb_type = MB_TYPE_INTRA;
1073         }
1074         break;
1075     case P_TYPE:
1076         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1077         if (mb_type < 0){
1078             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1079             return -1;
1080         }
1081         mb_type = ptype2mb_type[ mb_type ];
1082         break;
1083     case B_TYPE:
1084         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1085         if (mb_type < 0){
1086             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1087             return -1;
1088         }
1089         mb_type = btype2mb_type[ mb_type ];
1090         break;
1091     }
1092     dprintf("mb_type=%x\n", mb_type);
1093 //    motion_type = 0; /* avoid warning */
1094     if (IS_INTRA(mb_type)) {
1095         /* compute dct type */
1096         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1097             !s->frame_pred_frame_dct) {
1098             s->interlaced_dct = get_bits1(&s->gb);
1099         }
1100
1101         if (IS_QUANT(mb_type))
1102             s->qscale = get_qscale(s);
1103         
1104         if (s->concealment_motion_vectors) {
1105             /* just parse them */
1106             if (s->picture_structure != PICT_FRAME) 
1107                 skip_bits1(&s->gb); /* field select */
1108             
1109             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1110                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1111             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1112                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1113
1114             skip_bits1(&s->gb); /* marker */
1115         }else
1116             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1117         s->mb_intra = 1;
1118 #ifdef HAVE_XVMC
1119         //one 1 we memcpy blocks in xvmcvideo
1120         if(s->avctx->xvmc_acceleration > 1){
1121             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1122             if(s->swap_uv){
1123                 exchange_uv(s);
1124             }
1125         }
1126 #endif
1127
1128         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1129             for(i=0;i<4+(1<<s->chroma_format);i++) {
1130                 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1131                     return -1;
1132             }
1133         } else {
1134             for(i=0;i<6;i++) {
1135                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1136                     return -1;
1137             }
1138         }
1139     } else {
1140         if (mb_type & MB_TYPE_ZERO_MV){
1141             assert(mb_type & MB_TYPE_CBP);
1142
1143             /* compute dct type */
1144             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1145                 !s->frame_pred_frame_dct) {
1146                 s->interlaced_dct = get_bits1(&s->gb);
1147             }
1148
1149             if (IS_QUANT(mb_type))
1150                 s->qscale = get_qscale(s);
1151
1152             s->mv_dir = MV_DIR_FORWARD;
1153             if(s->picture_structure == PICT_FRAME)
1154                 s->mv_type = MV_TYPE_16X16;
1155             else{
1156                 s->mv_type = MV_TYPE_FIELD;
1157                 mb_type |= MB_TYPE_INTERLACED;
1158                 s->field_select[0][0]= s->picture_structure - 1;
1159             }
1160             s->last_mv[0][0][0] = 0;
1161             s->last_mv[0][0][1] = 0;
1162             s->last_mv[0][1][0] = 0;
1163             s->last_mv[0][1][1] = 0;
1164             s->mv[0][0][0] = 0;
1165             s->mv[0][0][1] = 0;
1166         }else{
1167             assert(mb_type & MB_TYPE_L0L1);
1168 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1169             /* get additionnal motion vector type */
1170             if (s->frame_pred_frame_dct) 
1171                 motion_type = MT_FRAME;
1172             else{
1173                 motion_type = get_bits(&s->gb, 2);
1174             }
1175
1176             /* compute dct type */
1177             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1178                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1179                 s->interlaced_dct = get_bits1(&s->gb);
1180             }
1181
1182             if (IS_QUANT(mb_type))
1183                 s->qscale = get_qscale(s);
1184
1185             /* motion vectors */
1186             s->mv_dir = 0;
1187             for(i=0;i<2;i++) {
1188                 if (USES_LIST(mb_type, i)) {
1189                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1190                     dprintf("motion_type=%d\n", motion_type);
1191                     switch(motion_type) {
1192                     case MT_FRAME: /* or MT_16X8 */
1193                         if (s->picture_structure == PICT_FRAME) {
1194                             /* MT_FRAME */
1195                             mb_type |= MB_TYPE_16x16; 
1196                             s->mv_type = MV_TYPE_16X16;
1197                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1198                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1199                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1200                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1201                             /* full_pel: only for mpeg1 */
1202                             if (s->full_pel[i]){
1203                                 s->mv[i][0][0] <<= 1;
1204                                 s->mv[i][0][1] <<= 1;
1205                             }
1206                         } else {
1207                             /* MT_16X8 */
1208                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1209                             s->mv_type = MV_TYPE_16X8;
1210                             for(j=0;j<2;j++) {
1211                                 s->field_select[i][j] = get_bits1(&s->gb);
1212                                 for(k=0;k<2;k++) {
1213                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1214                                                              s->last_mv[i][j][k]);
1215                                     s->last_mv[i][j][k] = val;
1216                                     s->mv[i][j][k] = val;
1217                                 }
1218                             }
1219                         }
1220                         break;
1221                     case MT_FIELD:
1222                         s->mv_type = MV_TYPE_FIELD;
1223                         if (s->picture_structure == PICT_FRAME) {
1224                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1225                             for(j=0;j<2;j++) {
1226                                 s->field_select[i][j] = get_bits1(&s->gb);
1227                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1228                                                          s->last_mv[i][j][0]);
1229                                 s->last_mv[i][j][0] = val;
1230                                 s->mv[i][j][0] = val;
1231                                 dprintf("fmx=%d\n", val);
1232                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1233                                                          s->last_mv[i][j][1] >> 1);
1234                                 s->last_mv[i][j][1] = val << 1;
1235                                 s->mv[i][j][1] = val;
1236                                 dprintf("fmy=%d\n", val);
1237                             }
1238                         } else {
1239                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1240                             s->field_select[i][0] = get_bits1(&s->gb);
1241                             for(k=0;k<2;k++) {
1242                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1243                                                          s->last_mv[i][0][k]);
1244                                 s->last_mv[i][0][k] = val;
1245                                 s->last_mv[i][1][k] = val;
1246                                 s->mv[i][0][k] = val;
1247                             }
1248                         }
1249                         break;
1250                     case MT_DMV:
1251                         {
1252                             int dmx, dmy, mx, my, m;
1253
1254                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1255                                                     s->last_mv[i][0][0]);
1256                             s->last_mv[i][0][0] = mx;
1257                             s->last_mv[i][1][0] = mx;
1258                             dmx = get_dmv(s);
1259                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1260                                                     s->last_mv[i][0][1] >> 1);
1261                             dmy = get_dmv(s);
1262                             s->mv_type = MV_TYPE_DMV;
1263
1264
1265                             s->last_mv[i][0][1] = my<<1;
1266                             s->last_mv[i][1][1] = my<<1;
1267
1268                             s->mv[i][0][0] = mx;
1269                             s->mv[i][0][1] = my;
1270                             s->mv[i][1][0] = mx;//not used
1271                             s->mv[i][1][1] = my;//not used
1272
1273                             if (s->picture_structure == PICT_FRAME) {
1274                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1275
1276                                 //m = 1 + 2 * s->top_field_first;
1277                                 m = s->top_field_first ? 1 : 3;
1278
1279                                 /* top -> top pred */
1280                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1281                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1282                                 m = 4 - m;
1283                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1284                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1285                             } else {
1286                                 mb_type |= MB_TYPE_16x16;
1287
1288                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1289                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1290                                 if(s->picture_structure == PICT_TOP_FIELD)
1291                                     s->mv[i][2][1]--;
1292                                 else 
1293                                     s->mv[i][2][1]++;
1294                             }
1295                         }
1296                         break;
1297                     default:
1298                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1299                         return -1;
1300                     }
1301                 }
1302             }
1303         }
1304         
1305         s->mb_intra = 0;
1306
1307         if (HAS_CBP(mb_type)) {
1308             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1309             if (cbp < 0){
1310                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1311                 return -1;
1312             }
1313             cbp++;
1314             if(s->chroma_format == 2){//CHROMA422
1315                  cbp|= ( get_bits(&s->gb,2) ) << 6;
1316             }else
1317             if(s->chroma_format >  2){//CHROMA444
1318                  cbp|= ( get_bits(&s->gb,6) ) << 6;
1319             }
1320
1321 #ifdef HAVE_XVMC
1322             //on 1 we memcpy blocks in xvmcvideo
1323             if(s->avctx->xvmc_acceleration > 1){
1324                 XVMC_pack_pblocks(s,cbp);
1325                 if(s->swap_uv){
1326                     exchange_uv(s);
1327                 }
1328             }    
1329 #endif
1330
1331             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1332                 for(i=0;i<6;i++) {
1333                     if (cbp & (1<<(5-i)) ) {
1334                         if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1335                             return -1;
1336                     } else {
1337                         s->block_last_index[i] = -1;
1338                     }
1339                 }
1340                 if (s->chroma_format >= 2) {
1341                     if (s->chroma_format == 2) {//CHROMA_422)
1342                         for(i=6;i<8;i++) {
1343                             if (cbp & (1<<(6+7-i)) ) {
1344                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1345                                     return -1;
1346                             } else {
1347                                 s->block_last_index[i] = -1;
1348                             }
1349                         }
1350                     }else{ /*CHROMA_444*/
1351                         for(i=6;i<12;i++) {
1352                             if (cbp & (1<<(6+11-i)) ) {
1353                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1354                                     return -1;
1355                             } else {
1356                                 s->block_last_index[i] = -1;
1357                             }
1358                         }
1359                     }
1360                 }
1361             } else {
1362                 for(i=0;i<6;i++) {
1363                     if (cbp & 32) {
1364                         if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1365                             return -1;
1366                     } else {
1367                         s->block_last_index[i] = -1;
1368                     }
1369                     cbp+=cbp;
1370                 }
1371             }
1372         }else{
1373             for(i=0;i<6;i++)
1374                 s->block_last_index[i] = -1;
1375         }
1376     }
1377
1378     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1379
1380     return 0;
1381 }
1382
1383 /* as h263, but only 17 codes */
1384 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1385 {
1386     int code, sign, val, l, shift;
1387
1388     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1389     if (code == 0) {
1390         return pred;
1391     }
1392     if (code < 0) {
1393         return 0xffff;
1394     }
1395
1396     sign = get_bits1(&s->gb);
1397     shift = fcode - 1;
1398     val = code;
1399     if (shift) {
1400         val = (val - 1) << shift;
1401         val |= get_bits(&s->gb, shift);
1402         val++;
1403     }
1404     if (sign)
1405         val = -val;
1406     val += pred;
1407     
1408     /* modulo decoding */
1409     l = 1 << (shift+4);
1410     val = ((val + l)&(l*2-1)) - l;
1411     return val;
1412 }
1413
1414 static inline int decode_dc(GetBitContext *gb, int component)
1415 {
1416     int code, diff;
1417
1418     if (component == 0) {
1419         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1420     } else {
1421         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1422     }
1423     if (code < 0){
1424         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1425         return 0xffff;
1426     }
1427     if (code == 0) {
1428         diff = 0;
1429     } else {
1430         diff = get_xbits(gb, code);
1431     }
1432     return diff;
1433 }
1434
1435 static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1436                                DCTELEM *block, 
1437                                int n)
1438 {
1439     int level, dc, diff, i, j, run;
1440     int component;
1441     RLTable *rl = &rl_mpeg1;
1442     uint8_t * const scantable= s->intra_scantable.permutated;
1443     const uint16_t *quant_matrix= s->intra_matrix;
1444     const int qscale= s->qscale;
1445
1446     /* DC coef */
1447     component = (n <= 3 ? 0 : n - 4 + 1);
1448     diff = decode_dc(&s->gb, component);
1449     if (diff >= 0xffff)
1450         return -1;
1451     dc = s->last_dc[component];
1452     dc += diff;
1453     s->last_dc[component] = dc;
1454     block[0] = dc<<3;
1455     dprintf("dc=%d diff=%d\n", dc, diff);
1456     i = 0;
1457     {
1458         OPEN_READER(re, &s->gb);    
1459         /* now quantify & encode AC coefs */
1460         for(;;) {
1461             UPDATE_CACHE(re, &s->gb);
1462             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1463             
1464             if(level == 127){
1465                 break;
1466             } else if(level != 0) {
1467                 i += run;
1468                 j = scantable[i];
1469                 level= (level*qscale*quant_matrix[j])>>4;
1470                 level= (level-1)|1;
1471                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1472                 LAST_SKIP_BITS(re, &s->gb, 1);
1473             } else {
1474                 /* escape */
1475                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1476                 UPDATE_CACHE(re, &s->gb);
1477                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1478                 if (level == -128) {
1479                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1480                 } else if (level == 0) {
1481                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1482                 }
1483                 i += run;
1484                 j = scantable[i];
1485                 if(level<0){
1486                     level= -level;
1487                     level= (level*qscale*quant_matrix[j])>>4;
1488                     level= (level-1)|1;
1489                     level= -level;
1490                 }else{
1491                     level= (level*qscale*quant_matrix[j])>>4;
1492                     level= (level-1)|1;
1493                 }
1494             }
1495             if (i > 63){
1496                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1497                 return -1;
1498             }
1499
1500             block[j] = level;
1501         }
1502         CLOSE_READER(re, &s->gb);
1503     }
1504     s->block_last_index[n] = i;
1505    return 0;
1506 }
1507
1508 static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1509                                DCTELEM *block, 
1510                                int n)
1511 {
1512     int level, i, j, run;
1513     RLTable *rl = &rl_mpeg1;
1514     uint8_t * const scantable= s->intra_scantable.permutated;
1515     const uint16_t *quant_matrix= s->inter_matrix;
1516     const int qscale= s->qscale;
1517
1518     {
1519         int v;
1520         OPEN_READER(re, &s->gb);
1521         i = -1;
1522         /* special case for the first coef. no need to add a second vlc table */
1523         UPDATE_CACHE(re, &s->gb);
1524         v= SHOW_UBITS(re, &s->gb, 2);
1525         if (v & 2) {
1526             LAST_SKIP_BITS(re, &s->gb, 2);
1527             level= (3*qscale*quant_matrix[0])>>5;
1528             level= (level-1)|1;
1529             if(v&1)
1530                 level= -level;
1531             block[0] = level;
1532             i++;
1533         }
1534
1535         /* now quantify & encode AC coefs */
1536         for(;;) {
1537             UPDATE_CACHE(re, &s->gb);
1538             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1539             
1540             if(level == 127){
1541                 break;
1542             } else if(level != 0) {
1543                 i += run;
1544                 j = scantable[i];
1545                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1546                 level= (level-1)|1;
1547                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1548                 LAST_SKIP_BITS(re, &s->gb, 1);
1549             } else {
1550                 /* escape */
1551                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1552                 UPDATE_CACHE(re, &s->gb);
1553                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1554                 if (level == -128) {
1555                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1556                 } else if (level == 0) {
1557                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1558                 }
1559                 i += run;
1560                 j = scantable[i];
1561                 if(level<0){
1562                     level= -level;
1563                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1564                     level= (level-1)|1;
1565                     level= -level;
1566                 }else{
1567                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1568                     level= (level-1)|1;
1569                 }
1570             }
1571             if (i > 63){
1572                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1573                 return -1;
1574             }
1575
1576             block[j] = level;
1577         }
1578         CLOSE_READER(re, &s->gb);
1579     }
1580     s->block_last_index[n] = i;
1581     return 0;
1582 }
1583
1584 /* Also does unquantization here, since I will never support mpeg2
1585    encoding */
1586 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1587                                DCTELEM *block, 
1588                                int n)
1589 {
1590     int level, i, j, run;
1591     RLTable *rl = &rl_mpeg1;
1592     uint8_t * const scantable= s->intra_scantable.permutated;
1593     const uint16_t *quant_matrix;
1594     const int qscale= s->qscale;
1595     int mismatch;
1596
1597     mismatch = 1;
1598
1599     {
1600         int v;
1601         OPEN_READER(re, &s->gb);
1602         i = -1;
1603         if (n < 4)
1604             quant_matrix = s->inter_matrix;
1605         else
1606             quant_matrix = s->chroma_inter_matrix;
1607
1608         /* special case for the first coef. no need to add a second vlc table */
1609         UPDATE_CACHE(re, &s->gb);
1610         v= SHOW_UBITS(re, &s->gb, 2);
1611         if (v & 2) {
1612             LAST_SKIP_BITS(re, &s->gb, 2);
1613             level= (3*qscale*quant_matrix[0])>>5;
1614             if(v&1)
1615                 level= -level;
1616             block[0] = level;
1617             mismatch ^= level;
1618             i++;
1619         }
1620
1621         /* now quantify & encode AC coefs */
1622         for(;;) {
1623             UPDATE_CACHE(re, &s->gb);
1624             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1625             
1626             if(level == 127){
1627                 break;
1628             } else if(level != 0) {
1629                 i += run;
1630                 j = scantable[i];
1631                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1632                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1633                 LAST_SKIP_BITS(re, &s->gb, 1);
1634             } else {
1635                 /* escape */
1636                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1637                 UPDATE_CACHE(re, &s->gb);
1638                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1639
1640                 i += run;
1641                 j = scantable[i];
1642                 if(level<0){
1643                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1644                     level= -level;
1645                 }else{
1646                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1647                 }
1648             }
1649             if (i > 63){
1650                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1651                 return -1;
1652             }
1653             
1654             mismatch ^= level;
1655             block[j] = level;
1656         }
1657         CLOSE_READER(re, &s->gb);
1658     }
1659     block[63] ^= (mismatch & 1);
1660     
1661     s->block_last_index[n] = i;
1662     return 0;
1663 }
1664
1665 static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1666                                DCTELEM *block, 
1667                                int n)
1668 {
1669     int level, dc, diff, i, j, run;
1670     int component;
1671     RLTable *rl;
1672     uint8_t * const scantable= s->intra_scantable.permutated;
1673     const uint16_t *quant_matrix;
1674     const int qscale= s->qscale;
1675     int mismatch;
1676
1677     /* DC coef */
1678     if (n < 4){
1679         quant_matrix = s->intra_matrix;
1680         component = 0; 
1681     }else{
1682         quant_matrix = s->chroma_intra_matrix;
1683         component = (n&1) + 1;
1684     }
1685     diff = decode_dc(&s->gb, component);
1686     if (diff >= 0xffff)
1687         return -1;
1688     dc = s->last_dc[component];
1689     dc += diff;
1690     s->last_dc[component] = dc;
1691     block[0] = dc << (3 - s->intra_dc_precision);
1692     dprintf("dc=%d\n", block[0]);
1693     mismatch = block[0] ^ 1;
1694     i = 0;
1695     if (s->intra_vlc_format)
1696         rl = &rl_mpeg2;
1697     else
1698         rl = &rl_mpeg1;
1699
1700     {
1701         OPEN_READER(re, &s->gb);    
1702         /* now quantify & encode AC coefs */
1703         for(;;) {
1704             UPDATE_CACHE(re, &s->gb);
1705             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1706             
1707             if(level == 127){
1708                 break;
1709             } else if(level != 0) {
1710                 i += run;
1711                 j = scantable[i];
1712                 level= (level*qscale*quant_matrix[j])>>4;
1713                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1714                 LAST_SKIP_BITS(re, &s->gb, 1);
1715             } else {
1716                 /* escape */
1717                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1718                 UPDATE_CACHE(re, &s->gb);
1719                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1720                 i += run;
1721                 j = scantable[i];
1722                 if(level<0){
1723                     level= (-level*qscale*quant_matrix[j])>>4;
1724                     level= -level;
1725                 }else{
1726                     level= (level*qscale*quant_matrix[j])>>4;
1727                 }
1728             }
1729             if (i > 63){
1730                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1731                 return -1;
1732             }
1733             
1734             mismatch^= level;
1735             block[j] = level;
1736         }
1737         CLOSE_READER(re, &s->gb);
1738     }
1739     block[63]^= mismatch&1;
1740     
1741     s->block_last_index[n] = i;
1742     return 0;
1743 }
1744
1745 typedef struct Mpeg1Context {
1746     MpegEncContext mpeg_enc_ctx;
1747     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1748     int repeat_field; /* true if we must repeat the field */
1749     AVPanScan pan_scan; /** some temporary storage for the panscan */
1750     int slice_count;
1751 } Mpeg1Context;
1752
1753 static int mpeg_decode_init(AVCodecContext *avctx)
1754 {
1755     Mpeg1Context *s = avctx->priv_data;
1756     
1757     s->mpeg_enc_ctx.avctx= avctx;
1758     s->mpeg_enc_ctx.flags= avctx->flags;
1759     s->mpeg_enc_ctx.flags2= avctx->flags2;
1760     common_init(&s->mpeg_enc_ctx);
1761     init_vlcs();
1762
1763     s->mpeg_enc_ctx_allocated = 0;
1764     s->mpeg_enc_ctx.picture_number = 0;
1765     s->repeat_field = 0;
1766     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1767     return 0;
1768 }
1769
1770 /* return the 8 bit start code value and update the search
1771    state. Return -1 if no start code found */
1772 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1773 {
1774     uint8_t *buf_ptr;
1775     unsigned int state=0xFFFFFFFF, v;
1776     int val;
1777
1778     buf_ptr = *pbuf_ptr;
1779     while (buf_ptr < buf_end) {
1780         v = *buf_ptr++;
1781         if (state == 0x000001) {
1782             state = ((state << 8) | v) & 0xffffff;
1783             val = state;
1784             goto found;
1785         }
1786         state = ((state << 8) | v) & 0xffffff;
1787     }
1788     val = -1;
1789  found:
1790     *pbuf_ptr = buf_ptr;
1791     return val;
1792 }
1793
1794 static int mpeg1_decode_picture(AVCodecContext *avctx, 
1795                                 uint8_t *buf, int buf_size)
1796 {
1797     Mpeg1Context *s1 = avctx->priv_data;
1798     MpegEncContext *s = &s1->mpeg_enc_ctx;
1799     int ref, f_code, vbv_delay;
1800
1801     init_get_bits(&s->gb, buf, buf_size*8);
1802
1803     ref = get_bits(&s->gb, 10); /* temporal ref */
1804     s->pict_type = get_bits(&s->gb, 3);
1805
1806     vbv_delay= get_bits(&s->gb, 16);
1807     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1808         s->full_pel[0] = get_bits1(&s->gb);
1809         f_code = get_bits(&s->gb, 3);
1810         if (f_code == 0)
1811             return -1;
1812         s->mpeg_f_code[0][0] = f_code;
1813         s->mpeg_f_code[0][1] = f_code;
1814     }
1815     if (s->pict_type == B_TYPE) {
1816         s->full_pel[1] = get_bits1(&s->gb);
1817         f_code = get_bits(&s->gb, 3);
1818         if (f_code == 0)
1819             return -1;
1820         s->mpeg_f_code[1][0] = f_code;
1821         s->mpeg_f_code[1][1] = f_code;
1822     }
1823     s->current_picture.pict_type= s->pict_type;
1824     s->current_picture.key_frame= s->pict_type == I_TYPE;
1825     
1826 //    if(avctx->debug & FF_DEBUG_PICT_INFO)
1827 //        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
1828     
1829     s->y_dc_scale = 8;
1830     s->c_dc_scale = 8;
1831     s->first_slice = 1;
1832     return 0;
1833 }
1834
1835 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1836 {
1837     int horiz_size_ext, vert_size_ext;
1838     int bit_rate_ext;
1839     int frame_rate_ext_n, frame_rate_ext_d;
1840     int level, profile;
1841
1842     skip_bits(&s->gb, 1); /* profil and level esc*/
1843     profile= get_bits(&s->gb, 3);
1844     level= get_bits(&s->gb, 4);
1845     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1846     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1847     horiz_size_ext = get_bits(&s->gb, 2);
1848     vert_size_ext = get_bits(&s->gb, 2);
1849     s->width |= (horiz_size_ext << 12);
1850     s->height |= (vert_size_ext << 12);
1851     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1852     s->bit_rate += (bit_rate_ext << 12) * 400;
1853     skip_bits1(&s->gb); /* marker */
1854     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1855
1856     s->low_delay = get_bits1(&s->gb);
1857     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1858
1859     frame_rate_ext_n = get_bits(&s->gb, 2);
1860     frame_rate_ext_d = get_bits(&s->gb, 5);
1861     av_reduce(
1862         &s->avctx->frame_rate, 
1863         &s->avctx->frame_rate_base, 
1864         frame_rate_tab[s->frame_rate_index].num * (frame_rate_ext_n+1),
1865         frame_rate_tab[s->frame_rate_index].den * (frame_rate_ext_d+1),
1866         1<<30);
1867
1868     dprintf("sequence extension\n");
1869     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1870     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1871
1872     if(s->aspect_ratio_info <= 1)
1873         s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
1874     else{
1875         s->avctx->sample_aspect_ratio= 
1876             av_div_q(
1877                 mpeg2_aspect[s->aspect_ratio_info], 
1878                 (AVRational){s->width, s->height}
1879             );
1880     }
1881     
1882     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1883         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
1884                profile, level, s->avctx->rc_buffer_size, s->bit_rate);
1885 }
1886
1887 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1888 {
1889     MpegEncContext *s= &s1->mpeg_enc_ctx;
1890     int color_description, w, h;
1891
1892     skip_bits(&s->gb, 3); /* video format */
1893     color_description= get_bits1(&s->gb);
1894     if(color_description){
1895         skip_bits(&s->gb, 8); /* color primaries */
1896         skip_bits(&s->gb, 8); /* transfer_characteristics */
1897         skip_bits(&s->gb, 8); /* matrix_coefficients */
1898     }
1899     w= get_bits(&s->gb, 14);
1900     skip_bits(&s->gb, 1); //marker
1901     h= get_bits(&s->gb, 14);
1902     skip_bits(&s->gb, 1); //marker
1903     
1904     s1->pan_scan.width= 16*w;
1905     s1->pan_scan.height=16*h;
1906
1907     if(s->aspect_ratio_info > 1)
1908         s->avctx->sample_aspect_ratio= 
1909             av_div_q(
1910                 mpeg2_aspect[s->aspect_ratio_info], 
1911                 (AVRational){w, h}
1912             );
1913     
1914     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1915         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1916 }
1917
1918 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1919 {
1920     MpegEncContext *s= &s1->mpeg_enc_ctx;
1921     int i;
1922
1923     for(i=0; i<1; i++){ //FIXME count
1924         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1925         skip_bits(&s->gb, 1); //marker
1926         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1927         skip_bits(&s->gb, 1); //marker
1928     }
1929    
1930     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1931         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
1932             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
1933             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
1934             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1935         );
1936 }
1937
1938 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1939 {
1940     int i, v, j;
1941
1942     dprintf("matrix extension\n");
1943
1944     if (get_bits1(&s->gb)) {
1945         for(i=0;i<64;i++) {
1946             v = get_bits(&s->gb, 8);
1947             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1948             s->intra_matrix[j] = v;
1949             s->chroma_intra_matrix[j] = v;
1950         }
1951     }
1952     if (get_bits1(&s->gb)) {
1953         for(i=0;i<64;i++) {
1954             v = get_bits(&s->gb, 8);
1955             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1956             s->inter_matrix[j] = v;
1957             s->chroma_inter_matrix[j] = v;
1958         }
1959     }
1960     if (get_bits1(&s->gb)) {
1961         for(i=0;i<64;i++) {
1962             v = get_bits(&s->gb, 8);
1963             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1964             s->chroma_intra_matrix[j] = v;
1965         }
1966     }
1967     if (get_bits1(&s->gb)) {
1968         for(i=0;i<64;i++) {
1969             v = get_bits(&s->gb, 8);
1970             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1971             s->chroma_inter_matrix[j] = v;
1972         }
1973     }
1974 }
1975
1976 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1977 {
1978     s->full_pel[0] = s->full_pel[1] = 0;
1979     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1980     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1981     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1982     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1983     s->intra_dc_precision = get_bits(&s->gb, 2);
1984     s->picture_structure = get_bits(&s->gb, 2);
1985     s->top_field_first = get_bits1(&s->gb);
1986     s->frame_pred_frame_dct = get_bits1(&s->gb);
1987     s->concealment_motion_vectors = get_bits1(&s->gb);
1988     s->q_scale_type = get_bits1(&s->gb);
1989     s->intra_vlc_format = get_bits1(&s->gb);
1990     s->alternate_scan = get_bits1(&s->gb);
1991     s->repeat_first_field = get_bits1(&s->gb);
1992     s->chroma_420_type = get_bits1(&s->gb);
1993     s->progressive_frame = get_bits1(&s->gb);
1994
1995     if(s->picture_structure == PICT_FRAME)
1996         s->first_field=0;
1997     else{
1998         s->first_field ^= 1;
1999         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2000     }
2001     
2002     if(s->alternate_scan){
2003         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2004         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2005     }else{
2006         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2007         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2008     }
2009     
2010     /* composite display not parsed */
2011     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2012     dprintf("picture_structure=%d\n", s->picture_structure);
2013     dprintf("top field first=%d\n", s->top_field_first);
2014     dprintf("repeat first field=%d\n", s->repeat_first_field);
2015     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2016     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2017     dprintf("alternate_scan=%d\n", s->alternate_scan);
2018     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2019     dprintf("progressive_frame=%d\n", s->progressive_frame);
2020 }
2021
2022 static void mpeg_decode_extension(AVCodecContext *avctx, 
2023                                   uint8_t *buf, int buf_size)
2024 {
2025     Mpeg1Context *s1 = avctx->priv_data;
2026     MpegEncContext *s = &s1->mpeg_enc_ctx;
2027     int ext_type;
2028
2029     init_get_bits(&s->gb, buf, buf_size*8);
2030     
2031     ext_type = get_bits(&s->gb, 4);
2032     switch(ext_type) {
2033     case 0x1:
2034         mpeg_decode_sequence_extension(s);
2035         break;
2036     case 0x2:
2037         mpeg_decode_sequence_display_extension(s1);
2038         break;
2039     case 0x3:
2040         mpeg_decode_quant_matrix_extension(s);
2041         break;
2042     case 0x7:
2043         mpeg_decode_picture_display_extension(s1);
2044         break;
2045     case 0x8:
2046         mpeg_decode_picture_coding_extension(s);
2047         break;
2048     }
2049 }
2050
2051 static void exchange_uv(MpegEncContext *s){
2052 short * tmp;
2053
2054     tmp = s->pblocks[4];
2055     s->pblocks[4] = s->pblocks[5];
2056     s->pblocks[5] = tmp;
2057 }
2058
2059 static int mpeg_field_start(MpegEncContext *s){
2060     AVCodecContext *avctx= s->avctx;
2061     Mpeg1Context *s1 = (Mpeg1Context*)s;
2062
2063     /* start frame decoding */
2064     if(s->first_field || s->picture_structure==PICT_FRAME){
2065         if(MPV_frame_start(s, avctx) < 0)
2066             return -1;
2067
2068         ff_er_frame_start(s);
2069
2070         /* first check if we must repeat the frame */
2071         s->current_picture_ptr->repeat_pict = 0;
2072         if (s->repeat_first_field) {
2073             if (s->progressive_sequence) {
2074                 if (s->top_field_first)
2075                     s->current_picture_ptr->repeat_pict = 4;
2076                 else
2077                     s->current_picture_ptr->repeat_pict = 2;
2078             } else if (s->progressive_frame) {
2079                 s->current_picture_ptr->repeat_pict = 1;
2080             }
2081         }         
2082
2083         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2084     }else{ //second field
2085             int i;
2086             
2087             if(!s->current_picture_ptr){
2088                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2089                 return -1;
2090             }
2091             
2092             for(i=0; i<4; i++){
2093                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2094                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2095                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2096                 } 
2097             }
2098     }
2099 #ifdef HAVE_XVMC
2100 // MPV_frame_start will call this function too,
2101 // but we need to call it on every field
2102     if(s->avctx->xvmc_acceleration)
2103          XVMC_field_start(s,avctx);
2104 #endif
2105
2106     return 0;
2107 }
2108
2109 #define DECODE_SLICE_ERROR -1
2110 #define DECODE_SLICE_OK 0
2111
2112 /**
2113  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2114  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2115  *         DECODE_SLICE_OK if this slice is ok<br>
2116  */
2117 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2118                               uint8_t **buf, int buf_size)
2119 {
2120     MpegEncContext *s = &s1->mpeg_enc_ctx;
2121     AVCodecContext *avctx= s->avctx;
2122     int ret;
2123     const int field_pic= s->picture_structure != PICT_FRAME;
2124
2125     s->resync_mb_x=
2126     s->resync_mb_y= -1;
2127
2128     if (mb_y >= s->mb_height){
2129         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", s->mb_y, s->mb_height);
2130         return -1;
2131     }
2132     
2133     init_get_bits(&s->gb, *buf, buf_size*8);
2134
2135     ff_mpeg1_clean_buffers(s);
2136     s->interlaced_dct = 0;
2137
2138     s->qscale = get_qscale(s);
2139
2140     if(s->qscale == 0){
2141         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2142         return -1;
2143     }
2144     
2145     /* extra slice info */
2146     while (get_bits1(&s->gb) != 0) {
2147         skip_bits(&s->gb, 8);
2148     }
2149     
2150     s->mb_x=0;
2151
2152     for(;;) {
2153         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2154         if (code < 0){
2155             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2156             return -1;
2157         }
2158         if (code >= 33) {
2159             if (code == 33) {
2160                 s->mb_x += 33;
2161             }
2162             /* otherwise, stuffing, nothing to do */
2163         } else {
2164             s->mb_x += code;
2165             break;
2166         }
2167     }
2168
2169     s->resync_mb_x= s->mb_x;
2170     s->resync_mb_y= s->mb_y= mb_y;
2171     s->mb_skip_run= 0;
2172     ff_init_block_index(s);
2173
2174     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2175         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2176              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", 
2177                  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],
2178                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2179                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2180                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2181                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2182         }
2183     }    
2184     
2185     for(;;) {
2186 #ifdef HAVE_XVMC
2187         //one 1 we memcpy blocks in xvmcvideo
2188         if(s->avctx->xvmc_acceleration > 1)
2189             XVMC_init_block(s);//set s->block
2190 #endif
2191
2192         s->dsp.clear_blocks(s->block[0]);
2193
2194         ret = mpeg_decode_mb(s, s->block);
2195         s->chroma_qscale= s->qscale;
2196
2197         dprintf("ret=%d\n", ret);
2198         if (ret < 0)
2199             return -1;
2200
2201         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2202             const int wrap = field_pic ? 2*s->block_wrap[0] : s->block_wrap[0];
2203             int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2204             int motion_x, motion_y, dir, i;
2205             if(field_pic && !s->first_field)
2206                 xy += wrap/2;
2207
2208             for(dir=0; dir<2; dir++){
2209                 for(i=0; i<2; i++){
2210                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2211                         motion_x = motion_y = 0;
2212                     }else if (s->mv_type == MV_TYPE_16X16){
2213                         motion_x = s->mv[dir][0][0];
2214                         motion_y = s->mv[dir][0][1];
2215                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2216                         motion_x = s->mv[dir][i][0];
2217                         motion_y = s->mv[dir][i][1];
2218                     }
2219                     
2220                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2221                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2222                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2223                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2224                     xy += wrap;
2225                 }
2226             }
2227         }
2228
2229         s->dest[0] += 16;
2230         s->dest[1] += 8;
2231         s->dest[2] += 8;
2232
2233         MPV_decode_mb(s, s->block);
2234         
2235         if (++s->mb_x >= s->mb_width) {
2236
2237             ff_draw_horiz_band(s, 16*s->mb_y, 16);
2238
2239             s->mb_x = 0;
2240             s->mb_y++;
2241
2242             if(s->mb_y<<field_pic >= s->mb_height){
2243                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2244
2245                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2246                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2247                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2248                     return -1;
2249                 }else
2250                     goto eos;
2251             }
2252             
2253             ff_init_block_index(s);
2254         }
2255
2256         /* skip mb handling */
2257         if (s->mb_skip_run == -1) {
2258             /* read again increment */
2259             s->mb_skip_run = 0;
2260             for(;;) {
2261                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2262                 if (code < 0){
2263                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2264                     return -1;
2265                 }
2266                 if (code >= 33) {
2267                     if (code == 33) {
2268                         s->mb_skip_run += 33;
2269                     }else if(code == 35){
2270                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2271                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2272                             return -1;
2273                         }
2274                         goto eos; /* end of slice */
2275                     }
2276                     /* otherwise, stuffing, nothing to do */
2277                 } else {
2278                     s->mb_skip_run += code;
2279                     break;
2280                 }
2281             }
2282         }
2283     }
2284 eos: // end of slice
2285     *buf += get_bits_count(&s->gb)/8 - 1;
2286 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2287     return 0;
2288 }
2289
2290 static int slice_decode_thread(AVCodecContext *c, void *arg){
2291     MpegEncContext *s= arg;
2292     uint8_t *buf= s->gb.buffer;
2293     int mb_y= s->start_mb_y;
2294
2295     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2296
2297     for(;;){
2298         int start_code, ret;
2299
2300         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2301         emms_c();
2302 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2303 //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);
2304         if(ret < 0){
2305             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2306                 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);
2307         }else{
2308             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);
2309         }
2310         
2311         if(s->mb_y == s->end_mb_y)
2312             return 0;
2313         
2314         start_code = find_start_code(&buf, s->gb.buffer_end);
2315         mb_y= start_code - SLICE_MIN_START_CODE;
2316         if(mb_y < 0 || mb_y >= s->end_mb_y)
2317             return -1;
2318     }
2319     
2320     return 0; //not reached
2321 }
2322
2323 /**
2324  * handles slice ends.
2325  * @return 1 if it seems to be the last slice of 
2326  */
2327 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2328 {
2329     Mpeg1Context *s1 = avctx->priv_data;
2330     MpegEncContext *s = &s1->mpeg_enc_ctx;
2331        
2332     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2333         return 0;
2334
2335 #ifdef HAVE_XVMC
2336     if(s->avctx->xvmc_acceleration)
2337         XVMC_field_end(s);
2338 #endif
2339     /* end of slice reached */
2340     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2341         /* end of image */
2342
2343         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2344
2345         ff_er_frame_end(s);
2346
2347         MPV_frame_end(s);
2348
2349         if (s->pict_type == B_TYPE || s->low_delay) {
2350             *pict= *(AVFrame*)s->current_picture_ptr;
2351             ff_print_debug_info(s, pict);
2352         } else {
2353             s->picture_number++;
2354             /* latency of 1 frame for I and P frames */
2355             /* XXX: use another variable than picture_number */
2356             if (s->last_picture_ptr != NULL) {
2357                 *pict= *(AVFrame*)s->last_picture_ptr;
2358                  ff_print_debug_info(s, pict);
2359             }
2360         }
2361
2362         return 1;
2363     } else {
2364         return 0;
2365     }
2366 }
2367
2368 static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2369                                  uint8_t *buf, int buf_size)
2370 {
2371     Mpeg1Context *s1 = avctx->priv_data;
2372     MpegEncContext *s = &s1->mpeg_enc_ctx;
2373     int width, height, i, v, j;
2374     float aspect;
2375
2376     init_get_bits(&s->gb, buf, buf_size*8);
2377
2378     width = get_bits(&s->gb, 12);
2379     height = get_bits(&s->gb, 12);
2380     s->aspect_ratio_info= get_bits(&s->gb, 4);
2381     if (s->aspect_ratio_info == 0)
2382         return -1;
2383     aspect= 1.0/mpeg1_aspect[s->aspect_ratio_info];
2384     avctx->sample_aspect_ratio= av_d2q(aspect, 255);
2385
2386     s->frame_rate_index = get_bits(&s->gb, 4);
2387     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2388         return -1;
2389     s->bit_rate = get_bits(&s->gb, 18) * 400;
2390     if (get_bits1(&s->gb) == 0) /* marker */
2391         return -1;
2392     if (width <= 0 || height <= 0 ||
2393         (width % 2) != 0 || (height % 2) != 0)
2394         return -1;
2395     if (width != s->width ||
2396         height != s->height) {
2397         /* start new mpeg1 context decoding */
2398         s->out_format = FMT_MPEG1;
2399         if (s1->mpeg_enc_ctx_allocated) {
2400             MPV_common_end(s);
2401         }
2402         s->width = width;
2403         s->height = height;
2404         avctx->has_b_frames= 1;
2405         avctx->width = width;
2406         avctx->height = height;
2407         avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
2408         avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
2409         avctx->bit_rate = s->bit_rate;
2410         
2411         if(avctx->xvmc_acceleration){
2412             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2413         }else{
2414             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2415         }
2416         
2417         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2418             if( avctx->idct_algo == FF_IDCT_AUTO )
2419                 avctx->idct_algo = FF_IDCT_SIMPLE;
2420
2421         if (MPV_common_init(s) < 0)
2422             return -1;
2423         s1->mpeg_enc_ctx_allocated = 1;
2424         s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2425     }
2426
2427     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2428     skip_bits(&s->gb, 1);
2429
2430     /* get matrix */
2431     if (get_bits1(&s->gb)) {
2432         for(i=0;i<64;i++) {
2433             v = get_bits(&s->gb, 8);
2434             if(v==0){
2435                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2436                 return -1;
2437             }
2438             j = s->intra_scantable.permutated[i];
2439             s->intra_matrix[j] = v;
2440             s->chroma_intra_matrix[j] = v;
2441         }
2442 #ifdef DEBUG
2443         dprintf("intra matrix present\n");
2444         for(i=0;i<64;i++)
2445             dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2446         printf("\n");
2447 #endif
2448     } else {
2449         for(i=0;i<64;i++) {
2450             int j= s->dsp.idct_permutation[i];
2451             v = ff_mpeg1_default_intra_matrix[i];
2452             s->intra_matrix[j] = v;
2453             s->chroma_intra_matrix[j] = v;
2454         }
2455     }
2456     if (get_bits1(&s->gb)) {
2457         for(i=0;i<64;i++) {
2458             v = get_bits(&s->gb, 8);
2459             if(v==0){
2460                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2461                 return -1;
2462             }
2463             j = s->intra_scantable.permutated[i];
2464             s->inter_matrix[j] = v;
2465             s->chroma_inter_matrix[j] = v;
2466         }
2467 #ifdef DEBUG
2468         dprintf("non intra matrix present\n");
2469         for(i=0;i<64;i++)
2470             dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2471         printf("\n");
2472 #endif
2473     } else {
2474         for(i=0;i<64;i++) {
2475             int j= s->dsp.idct_permutation[i];
2476             v = ff_mpeg1_default_non_intra_matrix[i];
2477             s->inter_matrix[j] = v;
2478             s->chroma_inter_matrix[j] = v;
2479         }
2480     }
2481     
2482     if(show_bits(&s->gb, 23) != 0){
2483         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2484         return -1;
2485     }
2486
2487     /* we set mpeg2 parameters so that it emulates mpeg1 */
2488     s->progressive_sequence = 1;
2489     s->progressive_frame = 1;
2490     s->picture_structure = PICT_FRAME;
2491     s->frame_pred_frame_dct = 1;
2492     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2493     avctx->sub_id = 1; /* indicates mpeg1 */
2494     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2495     
2496     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2497         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2498                s->avctx->rc_buffer_size, s->bit_rate);
2499     
2500     return 0;
2501 }
2502
2503 static int vcr2_init_sequence(AVCodecContext *avctx)
2504 {
2505     Mpeg1Context *s1 = avctx->priv_data;
2506     MpegEncContext *s = &s1->mpeg_enc_ctx;
2507     int i, v;
2508
2509     /* start new mpeg1 context decoding */
2510     s->out_format = FMT_MPEG1;
2511     if (s1->mpeg_enc_ctx_allocated) {
2512         MPV_common_end(s);
2513     }
2514     s->width = avctx->width;
2515     s->height = avctx->height;
2516     avctx->has_b_frames= 0; //true?
2517     s->low_delay= 1;
2518
2519     if(avctx->xvmc_acceleration){
2520         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2521     }else{
2522         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2523     }
2524
2525     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2526         if( avctx->idct_algo == FF_IDCT_AUTO )
2527             avctx->idct_algo = FF_IDCT_SIMPLE;
2528     
2529     if (MPV_common_init(s) < 0)
2530         return -1;
2531     exchange_uv(s);//common init reset pblocks, so we swap them here
2532     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2533     s1->mpeg_enc_ctx_allocated = 1;
2534
2535     for(i=0;i<64;i++) {
2536         int j= s->dsp.idct_permutation[i];
2537         v = ff_mpeg1_default_intra_matrix[i];
2538         s->intra_matrix[j] = v;
2539         s->chroma_intra_matrix[j] = v;
2540
2541         v = ff_mpeg1_default_non_intra_matrix[i];
2542         s->inter_matrix[j] = v;
2543         s->chroma_inter_matrix[j] = v;
2544     }
2545
2546     s->progressive_sequence = 1;
2547     s->progressive_frame = 1;
2548     s->picture_structure = PICT_FRAME;
2549     s->frame_pred_frame_dct = 1;
2550     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2551     avctx->sub_id = 2; /* indicates mpeg2 */
2552     return 0;
2553 }
2554
2555
2556 static void mpeg_decode_user_data(AVCodecContext *avctx, 
2557                                   const uint8_t *buf, int buf_size)
2558 {
2559     const uint8_t *p;
2560     int len, flags;
2561     p = buf;
2562     len = buf_size;
2563
2564     /* we parse the DTG active format information */
2565     if (len >= 5 &&
2566         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2567         flags = p[4];
2568         p += 5;
2569         len -= 5;
2570         if (flags & 0x80) {
2571             /* skip event id */
2572             if (len < 2)
2573                 return;
2574             p += 2;
2575             len -= 2;
2576         }
2577         if (flags & 0x40) {
2578             if (len < 1)
2579                 return;
2580             avctx->dtg_active_format = p[0] & 0x0f;
2581         }
2582     }
2583 }
2584
2585 static void mpeg_decode_gop(AVCodecContext *avctx, 
2586                             uint8_t *buf, int buf_size){
2587     Mpeg1Context *s1 = avctx->priv_data;
2588     MpegEncContext *s = &s1->mpeg_enc_ctx;
2589
2590     int drop_frame_flag;
2591     int time_code_hours, time_code_minutes;
2592     int time_code_seconds, time_code_pictures;
2593     int broken_link;
2594
2595     s->first_field = 0;
2596
2597     init_get_bits(&s->gb, buf, buf_size*8);
2598
2599     drop_frame_flag = get_bits1(&s->gb);
2600     
2601     time_code_hours=get_bits(&s->gb,5);
2602     time_code_minutes = get_bits(&s->gb,6);
2603     skip_bits1(&s->gb);//marker bit
2604     time_code_seconds = get_bits(&s->gb,6);
2605     time_code_pictures = get_bits(&s->gb,6);
2606     /*broken_link indicate that after editing the
2607       reference frames of the first B-Frames after GOP I-Frame
2608       are missing (open gop)*/
2609     broken_link = get_bits1(&s->gb);
2610     if(broken_link == 1){
2611 //        avcodec_flush_buffers(avctx);
2612         ff_mpeg_flush(avctx);
2613     }
2614 }
2615
2616 /**
2617  * finds the end of the current frame in the bitstream.
2618  * @return the position of the first byte of the next frame, or -1
2619  */
2620 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2621     ParseContext *pc= &s->parse_context;
2622     int i;
2623     uint32_t state;
2624     
2625     state= pc->state;
2626     
2627     i=0;
2628     if(!pc->frame_start_found){
2629         for(i=0; i<buf_size; i++){
2630             state= (state<<8) | buf[i];
2631             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2632                 i++;
2633                 pc->frame_start_found=1;
2634                 break;
2635             }
2636         }
2637     }
2638     
2639     if(pc->frame_start_found){
2640         for(; i<buf_size; i++){
2641             state= (state<<8) | buf[i];
2642             if((state&0xFFFFFF00) == 0x100){
2643                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2644                     pc->frame_start_found=0;
2645                     pc->state=-1; 
2646                     return i-3;
2647                 }
2648             }
2649         }
2650     }        
2651     pc->state= state;
2652     return END_NOT_FOUND;
2653 }
2654
2655 /* handle buffering and image synchronisation */
2656 static int mpeg_decode_frame(AVCodecContext *avctx, 
2657                              void *data, int *data_size,
2658                              uint8_t *buf, int buf_size)
2659 {
2660     Mpeg1Context *s = avctx->priv_data;
2661     uint8_t *buf_end, *buf_ptr;
2662     int ret, start_code, input_size;
2663     AVFrame *picture = data;
2664     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2665     dprintf("fill_buffer\n");
2666
2667     *data_size = 0;
2668
2669     /* special case for last picture */
2670     if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2671         *picture= *(AVFrame*)s2->next_picture_ptr;
2672         s2->next_picture_ptr= NULL;
2673
2674         *data_size = sizeof(AVFrame);
2675         return 0;
2676     }
2677
2678     if(s2->flags&CODEC_FLAG_TRUNCATED){
2679         int next= mpeg1_find_frame_end(s2, buf, buf_size);
2680         
2681         if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2682             return buf_size;
2683     }    
2684     
2685     buf_ptr = buf;
2686     buf_end = buf + buf_size;
2687
2688 #if 0    
2689     if (s->repeat_field % 2 == 1) { 
2690         s->repeat_field++;
2691         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2692         //        s2->picture_number, s->repeat_field);
2693         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2694             *data_size = sizeof(AVPicture);
2695             goto the_end;
2696         }
2697     }
2698 #endif
2699
2700     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2701         vcr2_init_sequence(avctx);
2702     
2703     s->slice_count= 0;
2704         
2705     for(;;) {
2706         /* find start next code */
2707         start_code = find_start_code(&buf_ptr, buf_end);
2708         if (start_code < 0){
2709             if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2710                 if(avctx->thread_count > 1){
2711                     int i;
2712
2713                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2714                     for(i=0; i<s->slice_count; i++)
2715                         s2->error_count += s2->thread_context[i]->error_count;
2716                 }
2717                 if (slice_end(avctx, picture)) {
2718                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2719                         *data_size = sizeof(AVPicture);
2720                 }
2721             }
2722             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2723         }
2724         
2725         input_size = buf_end - buf_ptr;
2726
2727         if(avctx->debug & FF_DEBUG_STARTCODE){
2728             av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2729         }
2730
2731                 /* prepare data for next start code */
2732                 switch(start_code) {
2733                 case SEQ_START_CODE:
2734                     mpeg1_decode_sequence(avctx, buf_ptr, 
2735                                           input_size);
2736                     break;
2737                             
2738                 case PICTURE_START_CODE:
2739                     /* we have a complete image : we try to decompress it */
2740                     mpeg1_decode_picture(avctx, 
2741                                          buf_ptr, input_size);
2742                     break;
2743                 case EXT_START_CODE:
2744                     mpeg_decode_extension(avctx,
2745                                           buf_ptr, input_size);
2746                     break;
2747                 case USER_START_CODE:
2748                     mpeg_decode_user_data(avctx, 
2749                                           buf_ptr, input_size);
2750                     break;
2751                 case GOP_START_CODE:
2752                     mpeg_decode_gop(avctx, buf_ptr, input_size);
2753                     break;
2754                 default:
2755                     if (start_code >= SLICE_MIN_START_CODE &&
2756                         start_code <= SLICE_MAX_START_CODE) {
2757                         int mb_y= start_code - SLICE_MIN_START_CODE;
2758                         
2759                         /* skip b frames if we dont have reference frames */
2760                         if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2761                         /* skip b frames if we are in a hurry */
2762                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2763                         /* skip everything if we are in a hurry>=5 */
2764                         if(avctx->hurry_up>=5) break;
2765                         
2766                         if (!s->mpeg_enc_ctx_allocated) break;
2767                         
2768                         if(s2->first_slice){
2769                             s2->first_slice=0;
2770                             if(mpeg_field_start(s2) < 0)
2771                                 return -1;
2772                         }
2773                         
2774                         if(avctx->thread_count > 1){
2775                             int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2776                             if(threshold <= mb_y){
2777                                 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2778                                 
2779                                 thread_context->start_mb_y= mb_y;
2780                                 thread_context->end_mb_y  = s2->mb_height;
2781                                 if(s->slice_count){
2782                                     s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2783                                     ff_update_duplicate_context(thread_context, s2);
2784                                 }
2785                                 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2786                                 s->slice_count++;
2787                             }
2788                             buf_ptr += 2; //FIXME add minimum num of bytes per slice
2789                         }else{
2790                             ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2791                             emms_c();
2792
2793                             if(ret < 0){
2794                                 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2795                                     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);
2796                             }else{
2797                                 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);
2798                             }
2799                         }
2800                     }
2801                     break;
2802                 }
2803     }
2804 }
2805
2806 static int mpeg_decode_end(AVCodecContext *avctx)
2807 {
2808     Mpeg1Context *s = avctx->priv_data;
2809
2810     if (s->mpeg_enc_ctx_allocated)
2811         MPV_common_end(&s->mpeg_enc_ctx);
2812     return 0;
2813 }
2814
2815 AVCodec mpeg1video_decoder = {
2816     "mpeg1video",
2817     CODEC_TYPE_VIDEO,
2818     CODEC_ID_MPEG1VIDEO,
2819     sizeof(Mpeg1Context),
2820     mpeg_decode_init,
2821     NULL,
2822     mpeg_decode_end,
2823     mpeg_decode_frame,
2824     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2825     .flush= ff_mpeg_flush,
2826 };
2827
2828 AVCodec mpeg2video_decoder = {
2829     "mpeg2video",
2830     CODEC_TYPE_VIDEO,
2831     CODEC_ID_MPEG2VIDEO,
2832     sizeof(Mpeg1Context),
2833     mpeg_decode_init,
2834     NULL,
2835     mpeg_decode_end,
2836     mpeg_decode_frame,
2837     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2838     .flush= ff_mpeg_flush,
2839 };
2840
2841 //legacy decoder
2842 AVCodec mpegvideo_decoder = {
2843     "mpegvideo",
2844     CODEC_TYPE_VIDEO,
2845     CODEC_ID_MPEG2VIDEO,
2846     sizeof(Mpeg1Context),
2847     mpeg_decode_init,
2848     NULL,
2849     mpeg_decode_end,
2850     mpeg_decode_frame,
2851     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2852     .flush= ff_mpeg_flush,
2853 };
2854
2855 #ifdef CONFIG_ENCODERS
2856
2857 AVCodec mpeg1video_encoder = {
2858     "mpeg1video",
2859     CODEC_TYPE_VIDEO,
2860     CODEC_ID_MPEG1VIDEO,
2861     sizeof(MpegEncContext),
2862     encode_init,
2863     MPV_encode_picture,
2864     MPV_encode_end,
2865     .supported_framerates= frame_rate_tab+1,
2866 };
2867
2868 #ifdef CONFIG_RISKY
2869
2870 AVCodec mpeg2video_encoder = {
2871     "mpeg2video",
2872     CODEC_TYPE_VIDEO,
2873     CODEC_ID_MPEG2VIDEO,
2874     sizeof(MpegEncContext),
2875     encode_init,
2876     MPV_encode_picture,
2877     MPV_encode_end,
2878     .supported_framerates= frame_rate_tab+1,
2879 };
2880 #endif
2881 #endif
2882
2883 #ifdef HAVE_XVMC
2884 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2885     Mpeg1Context *s;
2886
2887     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2888         return -1;
2889     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2890         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2891     }
2892     mpeg_decode_init(avctx);
2893     s = avctx->priv_data;
2894
2895     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2896     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2897
2898     return 0;
2899 }
2900
2901 AVCodec mpeg_xvmc_decoder = {
2902     "mpegvideo_xvmc",
2903     CODEC_TYPE_VIDEO,
2904     CODEC_ID_MPEG2VIDEO_XVMC,
2905     sizeof(Mpeg1Context),
2906     mpeg_mc_decode_init,
2907     NULL,
2908     mpeg_decode_end,
2909     mpeg_decode_frame,
2910     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
2911     .flush= ff_mpeg_flush,
2912 };
2913
2914 #endif
2915
2916 /* this is ugly i know, but the alternative is too make 
2917    hundreds of vars global and prefix them with ff_mpeg1_
2918    which is far uglier. */
2919 #include "mdec.c"