reindentation, patch by From: Steve Lhomme, slhomme divxcorp com
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG1 codec / MPEG2 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard.
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file mpeg12.c
25  * MPEG1/2 codec
26  */
27
28 //#define DEBUG
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "mpegvideo.h"
32
33 #include "mpeg12data.h"
34
35 //#undef NDEBUG
36 //#include <assert.h>
37
38
39 /* Start codes. */
40 #define SEQ_END_CODE            0x000001b7
41 #define SEQ_START_CODE          0x000001b3
42 #define GOP_START_CODE          0x000001b8
43 #define PICTURE_START_CODE      0x00000100
44 #define SLICE_MIN_START_CODE    0x00000101
45 #define SLICE_MAX_START_CODE    0x000001af
46 #define EXT_START_CODE          0x000001b5
47 #define USER_START_CODE         0x000001b2
48
49 #define DC_VLC_BITS 9
50 #define MV_VLC_BITS 9
51 #define MBINCR_VLC_BITS 9
52 #define MB_PAT_VLC_BITS 9
53 #define MB_PTYPE_VLC_BITS 6
54 #define MB_BTYPE_VLC_BITS 6
55 #define TEX_VLC_BITS 9
56
57 #ifdef CONFIG_ENCODERS
58 static void mpeg1_encode_block(MpegEncContext *s,
59                          DCTELEM *block,
60                          int component);
61 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
62 #endif //CONFIG_ENCODERS
63 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
64                               DCTELEM *block,
65                               int n);
66 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
67                               DCTELEM *block,
68                               int n);
69 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
70 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
71                                         DCTELEM *block,
72                                         int n);
73 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
74                                     DCTELEM *block,
75                                     int n);
76 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
77 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
78 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
79 static void exchange_uv(MpegEncContext *s);
80
81 #ifdef HAVE_XVMC
82 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
83 extern int XVMC_field_end(MpegEncContext *s);
84 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
85 extern void XVMC_init_block(MpegEncContext *s);//set s->block
86 #endif
87
88 const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
89 const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
90 const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
91 const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
92                                            PIX_FMT_XVMC_MPEG2_IDCT,
93                                            PIX_FMT_XVMC_MPEG2_MC,
94                                            -1};
95 #ifdef CONFIG_ENCODERS
96 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
97 static uint8_t fcode_tab[MAX_MV*2+1];
98
99 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
100 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
101
102 /* simple include everything table for dc, first byte is bits number next 3 are code*/
103 static uint32_t mpeg1_lum_dc_uni[512];
104 static uint32_t mpeg1_chr_dc_uni[512];
105
106 static uint8_t mpeg1_index_run[2][64];
107 static int8_t mpeg1_max_level[2][64];
108 #endif //CONFIG_ENCODERS
109
110 static void init_2d_vlc_rl(RLTable *rl, int use_static)
111 {
112     int i;
113
114     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
115              &rl->table_vlc[0][1], 4, 2,
116              &rl->table_vlc[0][0], 4, 2, use_static);
117
118     if(use_static)
119         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120     else
121         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
122
123     for(i=0; i<rl->vlc.table_size; i++){
124         int code= rl->vlc.table[i][0];
125         int len = rl->vlc.table[i][1];
126         int level, run;
127
128         if(len==0){ // illegal code
129             run= 65;
130             level= MAX_LEVEL;
131         }else if(len<0){ //more bits needed
132             run= 0;
133             level= code;
134         }else{
135             if(code==rl->n){ //esc
136                 run= 65;
137                 level= 0;
138             }else if(code==rl->n+1){ //eob
139                 run= 0;
140                 level= 127;
141             }else{
142                 run=   rl->table_run  [code] + 1;
143                 level= rl->table_level[code];
144             }
145         }
146         rl->rl_vlc[0][i].len= len;
147         rl->rl_vlc[0][i].level= level;
148         rl->rl_vlc[0][i].run= run;
149     }
150 }
151
152 #ifdef CONFIG_ENCODERS
153 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
154     int i;
155
156     for(i=0; i<128; i++){
157         int level= i-64;
158         int run;
159         for(run=0; run<64; run++){
160             int len, bits, code;
161
162             int alevel= FFABS(level);
163             int sign= (level>>31)&1;
164
165             if (alevel > rl->max_level[0][run])
166                 code= 111; /*rl->n*/
167             else
168                 code= rl->index_run[0][run] + alevel - 1;
169
170             if (code < 111 /* rl->n */) {
171                 /* store the vlc & sign at once */
172                 len=   rl->table_vlc[code][1]+1;
173                 bits= (rl->table_vlc[code][0]<<1) + sign;
174             } else {
175                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
176                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
177
178                 bits|= run;
179                 if (alevel < 128) {
180                     bits<<=8; len+=8;
181                     bits|= level & 0xff;
182                 } else {
183                     bits<<=16; len+=16;
184                     bits|= level & 0xff;
185                     if (level < 0) {
186                         bits|= 0x8001 + level + 255;
187                     } else {
188                         bits|= level & 0xffff;
189                     }
190                 }
191             }
192
193             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
194         }
195     }
196 }
197
198
199 static int find_frame_rate_index(MpegEncContext *s){
200     int i;
201     int64_t dmin= INT64_MAX;
202     int64_t d;
203
204     for(i=1;i<14;i++) {
205         int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
206         int64_t n1= 1001LL*s->avctx->time_base.den;
207         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
208
209         d = FFABS(n0 - n1);
210         if(d < dmin){
211             dmin=d;
212             s->frame_rate_index= i;
213         }
214     }
215     if(dmin)
216         return -1;
217     else
218         return 0;
219 }
220
221 static int encode_init(AVCodecContext *avctx)
222 {
223     MpegEncContext *s = avctx->priv_data;
224
225     if(MPV_encode_init(avctx) < 0)
226         return -1;
227
228     if(find_frame_rate_index(s) < 0){
229         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
230             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
231             return -1;
232         }else{
233             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
234         }
235     }
236
237     if(avctx->profile == FF_PROFILE_UNKNOWN)
238         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
239
240     if(avctx->level == FF_LEVEL_UNKNOWN)
241         avctx->level = s->chroma_format == CHROMA_420 ? 8 : 5;
242
243     return 0;
244 }
245
246 static void put_header(MpegEncContext *s, int header)
247 {
248     align_put_bits(&s->pb);
249     put_bits(&s->pb, 16, header>>16);
250     put_bits(&s->pb, 16, header&0xFFFF);
251 }
252
253 /* put sequence header if needed */
254 static void mpeg1_encode_sequence_header(MpegEncContext *s)
255 {
256         unsigned int vbv_buffer_size;
257         unsigned int fps, v;
258         int i;
259         uint64_t time_code;
260         float best_aspect_error= 1E10;
261         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
262         int constraint_parameter_flag;
263
264         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
265
266         if (s->current_picture.key_frame) {
267             AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
268
269             /* mpeg1 header repeated every gop */
270             put_header(s, SEQ_START_CODE);
271
272             put_bits(&s->pb, 12, s->width);
273             put_bits(&s->pb, 12, s->height);
274
275             for(i=1; i<15; i++){
276                 float error= aspect_ratio;
277                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
278                     error-= 1.0/mpeg1_aspect[i];
279                 else
280                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
281
282                 error= FFABS(error);
283
284                 if(error < best_aspect_error){
285                     best_aspect_error= error;
286                     s->aspect_ratio_info= i;
287                 }
288             }
289
290             put_bits(&s->pb, 4, s->aspect_ratio_info);
291             put_bits(&s->pb, 4, s->frame_rate_index);
292
293             if(s->avctx->rc_max_rate){
294                 v = (s->avctx->rc_max_rate + 399) / 400;
295                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
296                     v = 0x3ffff;
297             }else{
298                 v= 0x3FFFF;
299             }
300
301             if(s->avctx->rc_buffer_size)
302                 vbv_buffer_size = s->avctx->rc_buffer_size;
303             else
304                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
305                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
306             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
307
308             put_bits(&s->pb, 18, v & 0x3FFFF);
309             put_bits(&s->pb, 1, 1); /* marker */
310             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
311
312             constraint_parameter_flag=
313                 s->width <= 768 && s->height <= 576 &&
314                 s->mb_width * s->mb_height <= 396 &&
315                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
316                 framerate.num <= framerate.den*30 &&
317                 s->avctx->me_range && s->avctx->me_range < 128 &&
318                 vbv_buffer_size <= 20 &&
319                 v <= 1856000/400 &&
320                 s->codec_id == CODEC_ID_MPEG1VIDEO;
321
322             put_bits(&s->pb, 1, constraint_parameter_flag);
323
324             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
325             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
326
327             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
328                 put_header(s, EXT_START_CODE);
329                 put_bits(&s->pb, 4, 1); //seq ext
330
331                 put_bits(&s->pb, 1, s->chroma_format == CHROMA_422); //escx
332
333                 put_bits(&s->pb, 3, s->avctx->profile); //profile
334                 put_bits(&s->pb, 4, s->avctx->level); //level
335
336                 put_bits(&s->pb, 1, s->progressive_sequence);
337                 put_bits(&s->pb, 2, s->chroma_format);
338                 put_bits(&s->pb, 2, 0); //horizontal size ext
339                 put_bits(&s->pb, 2, 0); //vertical size ext
340                 put_bits(&s->pb, 12, v>>18); //bitrate ext
341                 put_bits(&s->pb, 1, 1); //marker
342                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
343                 put_bits(&s->pb, 1, s->low_delay);
344                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
345                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
346             }
347
348             put_header(s, GOP_START_CODE);
349             put_bits(&s->pb, 1, 0); /* do drop frame */
350             /* time code : we must convert from the real frame rate to a
351                fake mpeg frame rate in case of low frame rate */
352             fps = (framerate.num + framerate.den/2)/ framerate.den;
353             time_code = s->current_picture_ptr->coded_picture_number;
354
355             s->gop_picture_number = time_code;
356             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
357             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
358             put_bits(&s->pb, 1, 1);
359             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
360             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
361             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
362             put_bits(&s->pb, 1, 0); /* broken link */
363         }
364 }
365
366 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
367     while (run >= 33) {
368         put_bits(&s->pb, 11, 0x008);
369         run -= 33;
370     }
371     put_bits(&s->pb, mbAddrIncrTable[run][1],
372              mbAddrIncrTable[run][0]);
373 }
374 #endif //CONFIG_ENCODERS
375
376 static void common_init(MpegEncContext *s)
377 {
378
379     s->y_dc_scale_table=
380     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
381
382 }
383
384 void ff_mpeg1_clean_buffers(MpegEncContext *s){
385     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
386     s->last_dc[1] = s->last_dc[0];
387     s->last_dc[2] = s->last_dc[0];
388     memset(s->last_mv, 0, sizeof(s->last_mv));
389 }
390
391 #ifdef CONFIG_ENCODERS
392
393 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
394     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
395     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
396     put_bits(&s->pb, 1, 0); /* slice extra information */
397 }
398
399 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
400 {
401     mpeg1_encode_sequence_header(s);
402
403     /* mpeg1 picture header */
404     put_header(s, PICTURE_START_CODE);
405     /* temporal reference */
406
407     // RAL: s->picture_number instead of s->fake_picture_number
408     put_bits(&s->pb, 10, (s->picture_number -
409                           s->gop_picture_number) & 0x3ff);
410     put_bits(&s->pb, 3, s->pict_type);
411
412     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
413     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
414
415     // RAL: Forward f_code also needed for B frames
416     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
417         put_bits(&s->pb, 1, 0); /* half pel coordinates */
418         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
419             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
420         else
421             put_bits(&s->pb, 3, 7); /* forward_f_code */
422     }
423
424     // RAL: Backward f_code necessary for B frames
425     if (s->pict_type == B_TYPE) {
426         put_bits(&s->pb, 1, 0); /* half pel coordinates */
427         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
428             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
429         else
430             put_bits(&s->pb, 3, 7); /* backward_f_code */
431     }
432
433     put_bits(&s->pb, 1, 0); /* extra bit picture */
434
435     s->frame_pred_frame_dct = 1;
436     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
437         put_header(s, EXT_START_CODE);
438         put_bits(&s->pb, 4, 8); //pic ext
439         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
440             put_bits(&s->pb, 4, s->f_code);
441             put_bits(&s->pb, 4, s->f_code);
442         }else{
443             put_bits(&s->pb, 8, 255);
444         }
445         if (s->pict_type == B_TYPE) {
446             put_bits(&s->pb, 4, s->b_code);
447             put_bits(&s->pb, 4, s->b_code);
448         }else{
449             put_bits(&s->pb, 8, 255);
450         }
451         put_bits(&s->pb, 2, s->intra_dc_precision);
452
453         assert(s->picture_structure == PICT_FRAME);
454         put_bits(&s->pb, 2, s->picture_structure);
455         if (s->progressive_sequence) {
456             put_bits(&s->pb, 1, 0); /* no repeat */
457         } else {
458             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
459         }
460         /* XXX: optimize the generation of this flag with entropy
461            measures */
462         s->frame_pred_frame_dct = s->progressive_sequence;
463
464         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
465         put_bits(&s->pb, 1, s->concealment_motion_vectors);
466         put_bits(&s->pb, 1, s->q_scale_type);
467         put_bits(&s->pb, 1, s->intra_vlc_format);
468         put_bits(&s->pb, 1, s->alternate_scan);
469         put_bits(&s->pb, 1, s->repeat_first_field);
470         s->progressive_frame = s->progressive_sequence;
471         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
472         put_bits(&s->pb, 1, s->progressive_frame);
473         put_bits(&s->pb, 1, 0); //composite_display_flag
474     }
475     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
476         int i;
477
478         put_header(s, USER_START_CODE);
479         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
480             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
481         }
482     }
483
484     s->mb_y=0;
485     ff_mpeg1_encode_slice_header(s);
486 }
487
488 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
489                                 int has_mv, int field_motion)
490 {
491     put_bits(&s->pb, n, bits);
492     if (!s->frame_pred_frame_dct) {
493         if (has_mv)
494             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
495         put_bits(&s->pb, 1, s->interlaced_dct);
496     }
497 }
498
499 static always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
500                                                    DCTELEM block[6][64],
501                                                    int motion_x, int motion_y,
502                                                    int mb_block_count)
503 {
504     int i, cbp;
505     const int mb_x = s->mb_x;
506     const int mb_y = s->mb_y;
507     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
508
509     /* compute cbp */
510     cbp = 0;
511     for(i=0;i<mb_block_count;i++) {
512         if (s->block_last_index[i] >= 0)
513             cbp |= 1 << (mb_block_count - 1 - i);
514     }
515
516     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
517         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
518         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
519         (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
520         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
521         s->mb_skip_run++;
522         s->qscale -= s->dquant;
523         s->skip_count++;
524         s->misc_bits++;
525         s->last_bits++;
526         if(s->pict_type == P_TYPE){
527             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
528             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
529         }
530     } else {
531         if(first_mb){
532             assert(s->mb_skip_run == 0);
533             encode_mb_skip_run(s, s->mb_x);
534         }else{
535             encode_mb_skip_run(s, s->mb_skip_run);
536         }
537
538         if (s->pict_type == I_TYPE) {
539             if(s->dquant && cbp){
540                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
541                 put_bits(&s->pb, 5, s->qscale);
542             }else{
543                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
544                 s->qscale -= s->dquant;
545             }
546             s->misc_bits+= get_bits_diff(s);
547             s->i_count++;
548         } else if (s->mb_intra) {
549             if(s->dquant && cbp){
550                 put_mb_modes(s, 6, 0x01, 0, 0);
551                 put_bits(&s->pb, 5, s->qscale);
552             }else{
553                 put_mb_modes(s, 5, 0x03, 0, 0);
554                 s->qscale -= s->dquant;
555             }
556             s->misc_bits+= get_bits_diff(s);
557             s->i_count++;
558             memset(s->last_mv, 0, sizeof(s->last_mv));
559         } else if (s->pict_type == P_TYPE) {
560             if(s->mv_type == MV_TYPE_16X16){
561                 if (cbp != 0) {
562                     if ((motion_x|motion_y) == 0) {
563                         if(s->dquant){
564                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
565                             put_bits(&s->pb, 5, s->qscale);
566                         }else{
567                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
568                         }
569                         s->misc_bits+= get_bits_diff(s);
570                     } else {
571                         if(s->dquant){
572                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
573                             put_bits(&s->pb, 5, s->qscale);
574                         }else{
575                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
576                         }
577                         s->misc_bits+= get_bits_diff(s);
578                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
579                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
580                         s->mv_bits+= get_bits_diff(s);
581                     }
582                 } else {
583                     put_bits(&s->pb, 3, 1); /* motion only */
584                     if (!s->frame_pred_frame_dct)
585                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
586                     s->misc_bits+= get_bits_diff(s);
587                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
588                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
589                     s->qscale -= s->dquant;
590                     s->mv_bits+= get_bits_diff(s);
591                 }
592                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
593                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
594             }else{
595                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
596
597                 if (cbp) {
598                     if(s->dquant){
599                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
600                         put_bits(&s->pb, 5, s->qscale);
601                     }else{
602                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
603                     }
604                 } else {
605                     put_bits(&s->pb, 3, 1); /* motion only */
606                     put_bits(&s->pb, 2, 1); /* motion_type: field */
607                     s->qscale -= s->dquant;
608                 }
609                 s->misc_bits+= get_bits_diff(s);
610                 for(i=0; i<2; i++){
611                     put_bits(&s->pb, 1, s->field_select[0][i]);
612                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
613                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
614                     s->last_mv[0][i][0]=   s->mv[0][i][0];
615                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
616                 }
617                 s->mv_bits+= get_bits_diff(s);
618             }
619             if(cbp) {
620                 if (s->chroma_y_shift) {
621                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
622                 } else {
623                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
624                     put_bits(&s->pb, 2, cbp & 3);
625                 }
626             }
627             s->f_count++;
628         } else{
629             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
630
631             if(s->mv_type == MV_TYPE_16X16){
632                 if (cbp){    // With coded bloc pattern
633                     if (s->dquant) {
634                         if(s->mv_dir == MV_DIR_FORWARD)
635                             put_mb_modes(s, 6, 3, 1, 0);
636                         else
637                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
638                         put_bits(&s->pb, 5, s->qscale);
639                     } else {
640                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
641                     }
642                 }else{    // No coded bloc pattern
643                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
644                     if (!s->frame_pred_frame_dct)
645                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
646                     s->qscale -= s->dquant;
647                 }
648                 s->misc_bits += get_bits_diff(s);
649                 if (s->mv_dir&MV_DIR_FORWARD){
650                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
651                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
652                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
653                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
654                     s->f_count++;
655                 }
656                 if (s->mv_dir&MV_DIR_BACKWARD){
657                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
658                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
659                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
660                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
661                     s->b_count++;
662                 }
663             }else{
664                 assert(s->mv_type == MV_TYPE_FIELD);
665                 assert(!s->frame_pred_frame_dct);
666                 if (cbp){    // With coded bloc pattern
667                     if (s->dquant) {
668                         if(s->mv_dir == MV_DIR_FORWARD)
669                             put_mb_modes(s, 6, 3, 1, 1);
670                         else
671                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
672                         put_bits(&s->pb, 5, s->qscale);
673                     } else {
674                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
675                     }
676                 }else{    // No coded bloc pattern
677                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
678                     put_bits(&s->pb, 2, 1); /* motion_type: field */
679                     s->qscale -= s->dquant;
680                 }
681                 s->misc_bits += get_bits_diff(s);
682                 if (s->mv_dir&MV_DIR_FORWARD){
683                     for(i=0; i<2; i++){
684                         put_bits(&s->pb, 1, s->field_select[0][i]);
685                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
686                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
687                         s->last_mv[0][i][0]=   s->mv[0][i][0];
688                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
689                     }
690                     s->f_count++;
691                 }
692                 if (s->mv_dir&MV_DIR_BACKWARD){
693                     for(i=0; i<2; i++){
694                         put_bits(&s->pb, 1, s->field_select[1][i]);
695                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
696                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
697                         s->last_mv[1][i][0]=   s->mv[1][i][0];
698                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
699                     }
700                     s->b_count++;
701                 }
702             }
703             s->mv_bits += get_bits_diff(s);
704             if(cbp) {
705                 if (s->chroma_y_shift) {
706                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
707                 } else {
708                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
709                     put_bits(&s->pb, 2, cbp & 3);
710                 }
711             }
712         }
713         for(i=0;i<mb_block_count;i++) {
714             if (cbp & (1 << (mb_block_count - 1 - i))) {
715                 mpeg1_encode_block(s, block[i], i);
716             }
717         }
718         s->mb_skip_run = 0;
719         if(s->mb_intra)
720             s->i_tex_bits+= get_bits_diff(s);
721         else
722             s->p_tex_bits+= get_bits_diff(s);
723     }
724 }
725
726 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
727 {
728     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
729     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
730 }
731
732 // RAL: Parameter added: f_or_b_code
733 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
734 {
735     int code, bit_size, l, bits, range, sign;
736
737     if (val == 0) {
738         /* zero vector */
739         code = 0;
740         put_bits(&s->pb,
741                  mbMotionVectorTable[0][1],
742                  mbMotionVectorTable[0][0]);
743     } else {
744         bit_size = f_or_b_code - 1;
745         range = 1 << bit_size;
746         /* modulo encoding */
747         l= INT_BIT - 5 - bit_size;
748         val= (val<<l)>>l;
749
750         if (val >= 0) {
751             val--;
752             code = (val >> bit_size) + 1;
753             bits = val & (range - 1);
754             sign = 0;
755         } else {
756             val = -val;
757             val--;
758             code = (val >> bit_size) + 1;
759             bits = val & (range - 1);
760             sign = 1;
761         }
762
763         assert(code > 0 && code <= 16);
764
765         put_bits(&s->pb,
766                  mbMotionVectorTable[code][1],
767                  mbMotionVectorTable[code][0]);
768
769         put_bits(&s->pb, 1, sign);
770         if (bit_size > 0) {
771             put_bits(&s->pb, bit_size, bits);
772         }
773     }
774 }
775
776 void ff_mpeg1_encode_init(MpegEncContext *s)
777 {
778     static int done=0;
779
780     common_init(s);
781
782     if(!done){
783         int f_code;
784         int mv;
785         int i;
786
787         done=1;
788         init_rl(&rl_mpeg1, 1);
789         if(s->intra_vlc_format)
790             init_rl(&rl_mpeg2, 1);
791
792         for(i=0; i<64; i++)
793         {
794                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
795                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
796         }
797
798         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
799         if(s->intra_vlc_format)
800             init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
801
802         /* build unified dc encoding tables */
803         for(i=-255; i<256; i++)
804         {
805                 int adiff, index;
806                 int bits, code;
807                 int diff=i;
808
809                 adiff = FFABS(diff);
810                 if(diff<0) diff--;
811                 index = av_log2(2*adiff);
812
813                 bits= vlc_dc_lum_bits[index] + index;
814                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
815                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
816
817                 bits= vlc_dc_chroma_bits[index] + index;
818                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
819                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
820         }
821
822         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
823
824         for(f_code=1; f_code<=MAX_FCODE; f_code++){
825             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
826                 int len;
827
828                 if(mv==0) len= mbMotionVectorTable[0][1];
829                 else{
830                     int val, bit_size, range, code;
831
832                     bit_size = f_code - 1;
833                     range = 1 << bit_size;
834
835                     val=mv;
836                     if (val < 0)
837                         val = -val;
838                     val--;
839                     code = (val >> bit_size) + 1;
840                     if(code<17){
841                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
842                     }else{
843                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
844                     }
845                 }
846
847                 mv_penalty[f_code][mv+MAX_MV]= len;
848             }
849         }
850
851
852         for(f_code=MAX_FCODE; f_code>0; f_code--){
853             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
854                 fcode_tab[mv+MAX_MV]= f_code;
855             }
856         }
857     }
858     s->me.mv_penalty= mv_penalty;
859     s->fcode_tab= fcode_tab;
860     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
861         s->min_qcoeff=-255;
862         s->max_qcoeff= 255;
863     }else{
864         s->min_qcoeff=-2047;
865         s->max_qcoeff= 2047;
866     }
867     if (s->intra_vlc_format) {
868         s->intra_ac_vlc_length=
869         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
870     } else {
871         s->intra_ac_vlc_length=
872         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
873     }
874     s->inter_ac_vlc_length=
875     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
876 }
877
878 static inline void encode_dc(MpegEncContext *s, int diff, int component)
879 {
880   if(((unsigned) (diff+255)) >= 511){
881         int index;
882
883         if(diff<0){
884             index= av_log2_16bit(-2*diff);
885             diff--;
886         }else{
887             index= av_log2_16bit(2*diff);
888         }
889         if (component == 0) {
890             put_bits(
891                 &s->pb,
892                 vlc_dc_lum_bits[index] + index,
893                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
894         }else{
895             put_bits(
896                 &s->pb,
897                 vlc_dc_chroma_bits[index] + index,
898                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
899         }
900   }else{
901     if (component == 0) {
902         put_bits(
903             &s->pb,
904             mpeg1_lum_dc_uni[diff+255]&0xFF,
905             mpeg1_lum_dc_uni[diff+255]>>8);
906     } else {
907         put_bits(
908             &s->pb,
909             mpeg1_chr_dc_uni[diff+255]&0xFF,
910             mpeg1_chr_dc_uni[diff+255]>>8);
911     }
912   }
913 }
914
915 static void mpeg1_encode_block(MpegEncContext *s,
916                                DCTELEM *block,
917                                int n)
918 {
919     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
920     int code, component;
921     const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
922
923     last_index = s->block_last_index[n];
924
925     /* DC coef */
926     if (s->mb_intra) {
927         component = (n <= 3 ? 0 : (n&1) + 1);
928         dc = block[0]; /* overflow is impossible */
929         diff = dc - s->last_dc[component];
930         encode_dc(s, diff, component);
931         s->last_dc[component] = dc;
932         i = 1;
933         if (s->intra_vlc_format)
934             table_vlc = rl_mpeg2.table_vlc;
935     } else {
936         /* encode the first coefficient : needs to be done here because
937            it is handled slightly differently */
938         level = block[0];
939         if (abs(level) == 1) {
940                 code = ((uint32_t)level >> 31); /* the sign bit */
941                 put_bits(&s->pb, 2, code | 0x02);
942                 i = 1;
943         } else {
944             i = 0;
945             last_non_zero = -1;
946             goto next_coef;
947         }
948     }
949
950     /* now quantify & encode AC coefs */
951     last_non_zero = i - 1;
952
953     for(;i<=last_index;i++) {
954         j = s->intra_scantable.permutated[i];
955         level = block[j];
956     next_coef:
957 #if 0
958         if (level != 0)
959             dprintf("level[%d]=%d\n", i, level);
960 #endif
961         /* encode using VLC */
962         if (level != 0) {
963             run = i - last_non_zero - 1;
964
965             alevel= level;
966             MASK_ABS(sign, alevel)
967             sign&=1;
968
969             if (alevel <= mpeg1_max_level[0][run]){
970                 code= mpeg1_index_run[0][run] + alevel - 1;
971                 /* store the vlc & sign at once */
972                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
973             } else {
974                 /* escape seems to be pretty rare <5% so i dont optimize it */
975                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
976                 /* escape: only clip in this case */
977                 put_bits(&s->pb, 6, run);
978                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
979                     if (alevel < 128) {
980                         put_bits(&s->pb, 8, level & 0xff);
981                     } else {
982                         if (level < 0) {
983                             put_bits(&s->pb, 16, 0x8001 + level + 255);
984                         } else {
985                             put_bits(&s->pb, 16, level & 0xffff);
986                         }
987                     }
988                 }else{
989                     put_bits(&s->pb, 12, level & 0xfff);
990                 }
991             }
992             last_non_zero = i;
993         }
994     }
995     /* end of block */
996     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
997 }
998 #endif //CONFIG_ENCODERS
999
1000 /******************************************/
1001 /* decoding */
1002
1003 static VLC dc_lum_vlc;
1004 static VLC dc_chroma_vlc;
1005 static VLC mv_vlc;
1006 static VLC mbincr_vlc;
1007 static VLC mb_ptype_vlc;
1008 static VLC mb_btype_vlc;
1009 static VLC mb_pat_vlc;
1010
1011 static void init_vlcs(void)
1012 {
1013     static int done = 0;
1014
1015     if (!done) {
1016         done = 1;
1017
1018         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1019                  vlc_dc_lum_bits, 1, 1,
1020                  vlc_dc_lum_code, 2, 2, 1);
1021         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1022                  vlc_dc_chroma_bits, 1, 1,
1023                  vlc_dc_chroma_code, 2, 2, 1);
1024         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1025                  &mbMotionVectorTable[0][1], 2, 1,
1026                  &mbMotionVectorTable[0][0], 2, 1, 1);
1027         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1028                  &mbAddrIncrTable[0][1], 2, 1,
1029                  &mbAddrIncrTable[0][0], 2, 1, 1);
1030         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1031                  &mbPatTable[0][1], 2, 1,
1032                  &mbPatTable[0][0], 2, 1, 1);
1033
1034         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1035                  &table_mb_ptype[0][1], 2, 1,
1036                  &table_mb_ptype[0][0], 2, 1, 1);
1037         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1038                  &table_mb_btype[0][1], 2, 1,
1039                  &table_mb_btype[0][0], 2, 1, 1);
1040         init_rl(&rl_mpeg1, 1);
1041         init_rl(&rl_mpeg2, 1);
1042
1043         init_2d_vlc_rl(&rl_mpeg1, 1);
1044         init_2d_vlc_rl(&rl_mpeg2, 1);
1045     }
1046 }
1047
1048 static inline int get_dmv(MpegEncContext *s)
1049 {
1050     if(get_bits1(&s->gb))
1051         return 1 - (get_bits1(&s->gb) << 1);
1052     else
1053         return 0;
1054 }
1055
1056 static inline int get_qscale(MpegEncContext *s)
1057 {
1058     int qscale = get_bits(&s->gb, 5);
1059     if (s->q_scale_type) {
1060         return non_linear_qscale[qscale];
1061     } else {
1062         return qscale << 1;
1063     }
1064 }
1065
1066 /* motion type (for mpeg2) */
1067 #define MT_FIELD 1
1068 #define MT_FRAME 2
1069 #define MT_16X8  2
1070 #define MT_DMV   3
1071
1072 static int mpeg_decode_mb(MpegEncContext *s,
1073                           DCTELEM block[12][64])
1074 {
1075     int i, j, k, cbp, val, mb_type, motion_type;
1076     const int mb_block_count = 4 + (1<< s->chroma_format);
1077
1078     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1079
1080     assert(s->mb_skipped==0);
1081
1082     if (s->mb_skip_run-- != 0) {
1083         if(s->pict_type == I_TYPE){
1084             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1085             return -1;
1086         }
1087
1088         /* skip mb */
1089         s->mb_intra = 0;
1090         for(i=0;i<12;i++)
1091             s->block_last_index[i] = -1;
1092         if(s->picture_structure == PICT_FRAME)
1093             s->mv_type = MV_TYPE_16X16;
1094         else
1095             s->mv_type = MV_TYPE_FIELD;
1096         if (s->pict_type == P_TYPE) {
1097             /* if P type, zero motion vector is implied */
1098             s->mv_dir = MV_DIR_FORWARD;
1099             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1100             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1101             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1102             s->field_select[0][0]= s->picture_structure - 1;
1103             s->mb_skipped = 1;
1104             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1105         } else {
1106             int mb_type;
1107
1108             if(s->mb_x)
1109                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1110             else
1111                 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
1112             if(IS_INTRA(mb_type))
1113                 return -1;
1114
1115             /* if B type, reuse previous vectors and directions */
1116             s->mv[0][0][0] = s->last_mv[0][0][0];
1117             s->mv[0][0][1] = s->last_mv[0][0][1];
1118             s->mv[1][0][0] = s->last_mv[1][0][0];
1119             s->mv[1][0][1] = s->last_mv[1][0][1];
1120
1121             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1122                 mb_type | MB_TYPE_SKIP;
1123 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1124
1125             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1126                 s->mb_skipped = 1;
1127         }
1128
1129         return 0;
1130     }
1131
1132     switch(s->pict_type) {
1133     default:
1134     case I_TYPE:
1135         if (get_bits1(&s->gb) == 0) {
1136             if (get_bits1(&s->gb) == 0){
1137                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1138                 return -1;
1139             }
1140             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1141         } else {
1142             mb_type = MB_TYPE_INTRA;
1143         }
1144         break;
1145     case P_TYPE:
1146         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1147         if (mb_type < 0){
1148             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1149             return -1;
1150         }
1151         mb_type = ptype2mb_type[ mb_type ];
1152         break;
1153     case B_TYPE:
1154         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1155         if (mb_type < 0){
1156             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1157             return -1;
1158         }
1159         mb_type = btype2mb_type[ mb_type ];
1160         break;
1161     }
1162     dprintf("mb_type=%x\n", mb_type);
1163 //    motion_type = 0; /* avoid warning */
1164     if (IS_INTRA(mb_type)) {
1165         s->dsp.clear_blocks(s->block[0]);
1166
1167         if(!s->chroma_y_shift){
1168             s->dsp.clear_blocks(s->block[6]);
1169         }
1170
1171         /* compute dct type */
1172         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1173             !s->frame_pred_frame_dct) {
1174             s->interlaced_dct = get_bits1(&s->gb);
1175         }
1176
1177         if (IS_QUANT(mb_type))
1178             s->qscale = get_qscale(s);
1179
1180         if (s->concealment_motion_vectors) {
1181             /* just parse them */
1182             if (s->picture_structure != PICT_FRAME)
1183                 skip_bits1(&s->gb); /* field select */
1184
1185             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1186                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1187             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1188                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1189
1190             skip_bits1(&s->gb); /* marker */
1191         }else
1192             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1193         s->mb_intra = 1;
1194 #ifdef HAVE_XVMC
1195         //one 1 we memcpy blocks in xvmcvideo
1196         if(s->avctx->xvmc_acceleration > 1){
1197             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1198             if(s->swap_uv){
1199                 exchange_uv(s);
1200             }
1201         }
1202 #endif
1203
1204         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1205             if(s->flags2 & CODEC_FLAG2_FAST){
1206                 for(i=0;i<6;i++) {
1207                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1208                 }
1209             }else{
1210                 for(i=0;i<mb_block_count;i++) {
1211                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1212                         return -1;
1213                 }
1214             }
1215         } else {
1216             for(i=0;i<6;i++) {
1217                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1218                     return -1;
1219             }
1220         }
1221     } else {
1222         if (mb_type & MB_TYPE_ZERO_MV){
1223             assert(mb_type & MB_TYPE_CBP);
1224
1225             /* compute dct type */
1226             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1227                 !s->frame_pred_frame_dct) {
1228                 s->interlaced_dct = get_bits1(&s->gb);
1229             }
1230
1231             if (IS_QUANT(mb_type))
1232                 s->qscale = get_qscale(s);
1233
1234             s->mv_dir = MV_DIR_FORWARD;
1235             if(s->picture_structure == PICT_FRAME)
1236                 s->mv_type = MV_TYPE_16X16;
1237             else{
1238                 s->mv_type = MV_TYPE_FIELD;
1239                 mb_type |= MB_TYPE_INTERLACED;
1240                 s->field_select[0][0]= s->picture_structure - 1;
1241             }
1242             s->last_mv[0][0][0] = 0;
1243             s->last_mv[0][0][1] = 0;
1244             s->last_mv[0][1][0] = 0;
1245             s->last_mv[0][1][1] = 0;
1246             s->mv[0][0][0] = 0;
1247             s->mv[0][0][1] = 0;
1248         }else{
1249             assert(mb_type & MB_TYPE_L0L1);
1250 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1251             /* get additionnal motion vector type */
1252             if (s->frame_pred_frame_dct)
1253                 motion_type = MT_FRAME;
1254             else{
1255                 motion_type = get_bits(&s->gb, 2);
1256             }
1257
1258             /* compute dct type */
1259             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1260                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1261                 s->interlaced_dct = get_bits1(&s->gb);
1262             }
1263
1264             if (IS_QUANT(mb_type))
1265                 s->qscale = get_qscale(s);
1266
1267             /* motion vectors */
1268             s->mv_dir = 0;
1269             for(i=0;i<2;i++) {
1270                 if (USES_LIST(mb_type, i)) {
1271                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1272                     dprintf("motion_type=%d\n", motion_type);
1273                     switch(motion_type) {
1274                     case MT_FRAME: /* or MT_16X8 */
1275                         if (s->picture_structure == PICT_FRAME) {
1276                             /* MT_FRAME */
1277                             mb_type |= MB_TYPE_16x16;
1278                             s->mv_type = MV_TYPE_16X16;
1279                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1280                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1281                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1282                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1283                             /* full_pel: only for mpeg1 */
1284                             if (s->full_pel[i]){
1285                                 s->mv[i][0][0] <<= 1;
1286                                 s->mv[i][0][1] <<= 1;
1287                             }
1288                         } else {
1289                             /* MT_16X8 */
1290                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1291                             s->mv_type = MV_TYPE_16X8;
1292                             for(j=0;j<2;j++) {
1293                                 s->field_select[i][j] = get_bits1(&s->gb);
1294                                 for(k=0;k<2;k++) {
1295                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1296                                                              s->last_mv[i][j][k]);
1297                                     s->last_mv[i][j][k] = val;
1298                                     s->mv[i][j][k] = val;
1299                                 }
1300                             }
1301                         }
1302                         break;
1303                     case MT_FIELD:
1304                         s->mv_type = MV_TYPE_FIELD;
1305                         if (s->picture_structure == PICT_FRAME) {
1306                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1307                             for(j=0;j<2;j++) {
1308                                 s->field_select[i][j] = get_bits1(&s->gb);
1309                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1310                                                          s->last_mv[i][j][0]);
1311                                 s->last_mv[i][j][0] = val;
1312                                 s->mv[i][j][0] = val;
1313                                 dprintf("fmx=%d\n", val);
1314                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1315                                                          s->last_mv[i][j][1] >> 1);
1316                                 s->last_mv[i][j][1] = val << 1;
1317                                 s->mv[i][j][1] = val;
1318                                 dprintf("fmy=%d\n", val);
1319                             }
1320                         } else {
1321                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1322                             s->field_select[i][0] = get_bits1(&s->gb);
1323                             for(k=0;k<2;k++) {
1324                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1325                                                          s->last_mv[i][0][k]);
1326                                 s->last_mv[i][0][k] = val;
1327                                 s->last_mv[i][1][k] = val;
1328                                 s->mv[i][0][k] = val;
1329                             }
1330                         }
1331                         break;
1332                     case MT_DMV:
1333                         {
1334                             int dmx, dmy, mx, my, m;
1335
1336                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1337                                                     s->last_mv[i][0][0]);
1338                             s->last_mv[i][0][0] = mx;
1339                             s->last_mv[i][1][0] = mx;
1340                             dmx = get_dmv(s);
1341                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1342                                                     s->last_mv[i][0][1] >> 1);
1343                             dmy = get_dmv(s);
1344                             s->mv_type = MV_TYPE_DMV;
1345
1346
1347                             s->last_mv[i][0][1] = my<<1;
1348                             s->last_mv[i][1][1] = my<<1;
1349
1350                             s->mv[i][0][0] = mx;
1351                             s->mv[i][0][1] = my;
1352                             s->mv[i][1][0] = mx;//not used
1353                             s->mv[i][1][1] = my;//not used
1354
1355                             if (s->picture_structure == PICT_FRAME) {
1356                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1357
1358                                 //m = 1 + 2 * s->top_field_first;
1359                                 m = s->top_field_first ? 1 : 3;
1360
1361                                 /* top -> top pred */
1362                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1363                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1364                                 m = 4 - m;
1365                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1366                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1367                             } else {
1368                                 mb_type |= MB_TYPE_16x16;
1369
1370                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1371                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1372                                 if(s->picture_structure == PICT_TOP_FIELD)
1373                                     s->mv[i][2][1]--;
1374                                 else
1375                                     s->mv[i][2][1]++;
1376                             }
1377                         }
1378                         break;
1379                     default:
1380                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1381                         return -1;
1382                     }
1383                 }
1384             }
1385         }
1386
1387         s->mb_intra = 0;
1388         if (HAS_CBP(mb_type)) {
1389             s->dsp.clear_blocks(s->block[0]);
1390
1391             if(!s->chroma_y_shift){
1392                 s->dsp.clear_blocks(s->block[6]);
1393             }
1394
1395             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1396             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1397                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1398                 return -1;
1399             }
1400             if(mb_block_count > 6){
1401                  cbp<<= mb_block_count-6;
1402                  cbp |= get_bits(&s->gb, mb_block_count-6);
1403             }
1404
1405 #ifdef HAVE_XVMC
1406             //on 1 we memcpy blocks in xvmcvideo
1407             if(s->avctx->xvmc_acceleration > 1){
1408                 XVMC_pack_pblocks(s,cbp);
1409                 if(s->swap_uv){
1410                     exchange_uv(s);
1411                 }
1412             }
1413 #endif
1414
1415             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1416                 if(s->flags2 & CODEC_FLAG2_FAST){
1417                     for(i=0;i<6;i++) {
1418                         if(cbp & 32) {
1419                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1420                         } else {
1421                             s->block_last_index[i] = -1;
1422                         }
1423                         cbp+=cbp;
1424                     }
1425                 }else{
1426                     cbp<<= 12-mb_block_count;
1427
1428                     for(i=0;i<mb_block_count;i++) {
1429                         if ( cbp & (1<<11) ) {
1430                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1431                                 return -1;
1432                         } else {
1433                             s->block_last_index[i] = -1;
1434                         }
1435                         cbp+=cbp;
1436                     }
1437                 }
1438             } else {
1439                 if(s->flags2 & CODEC_FLAG2_FAST){
1440                     for(i=0;i<6;i++) {
1441                         if (cbp & 32) {
1442                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1443                         } else {
1444                             s->block_last_index[i] = -1;
1445                         }
1446                         cbp+=cbp;
1447                     }
1448                 }else{
1449                     for(i=0;i<6;i++) {
1450                         if (cbp & 32) {
1451                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1452                                 return -1;
1453                         } else {
1454                             s->block_last_index[i] = -1;
1455                         }
1456                         cbp+=cbp;
1457                     }
1458                 }
1459             }
1460         }else{
1461             for(i=0;i<12;i++)
1462                 s->block_last_index[i] = -1;
1463         }
1464     }
1465
1466     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1467
1468     return 0;
1469 }
1470
1471 /* as h263, but only 17 codes */
1472 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1473 {
1474     int code, sign, val, l, shift;
1475
1476     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1477     if (code == 0) {
1478         return pred;
1479     }
1480     if (code < 0) {
1481         return 0xffff;
1482     }
1483
1484     sign = get_bits1(&s->gb);
1485     shift = fcode - 1;
1486     val = code;
1487     if (shift) {
1488         val = (val - 1) << shift;
1489         val |= get_bits(&s->gb, shift);
1490         val++;
1491     }
1492     if (sign)
1493         val = -val;
1494     val += pred;
1495
1496     /* modulo decoding */
1497     l= INT_BIT - 5 - shift;
1498     val = (val<<l)>>l;
1499     return val;
1500 }
1501
1502 static inline int decode_dc(GetBitContext *gb, int component)
1503 {
1504     int code, diff;
1505
1506     if (component == 0) {
1507         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1508     } else {
1509         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1510     }
1511     if (code < 0){
1512         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1513         return 0xffff;
1514     }
1515     if (code == 0) {
1516         diff = 0;
1517     } else {
1518         diff = get_xbits(gb, code);
1519     }
1520     return diff;
1521 }
1522
1523 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1524                                DCTELEM *block,
1525                                int n)
1526 {
1527     int level, dc, diff, i, j, run;
1528     int component;
1529     RLTable *rl = &rl_mpeg1;
1530     uint8_t * const scantable= s->intra_scantable.permutated;
1531     const uint16_t *quant_matrix= s->intra_matrix;
1532     const int qscale= s->qscale;
1533
1534     /* DC coef */
1535     component = (n <= 3 ? 0 : n - 4 + 1);
1536     diff = decode_dc(&s->gb, component);
1537     if (diff >= 0xffff)
1538         return -1;
1539     dc = s->last_dc[component];
1540     dc += diff;
1541     s->last_dc[component] = dc;
1542     block[0] = dc<<3;
1543     dprintf("dc=%d diff=%d\n", dc, diff);
1544     i = 0;
1545     {
1546         OPEN_READER(re, &s->gb);
1547         /* now quantify & encode AC coefs */
1548         for(;;) {
1549             UPDATE_CACHE(re, &s->gb);
1550             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1551
1552             if(level == 127){
1553                 break;
1554             } else if(level != 0) {
1555                 i += run;
1556                 j = scantable[i];
1557                 level= (level*qscale*quant_matrix[j])>>4;
1558                 level= (level-1)|1;
1559                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1560                 LAST_SKIP_BITS(re, &s->gb, 1);
1561             } else {
1562                 /* escape */
1563                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1564                 UPDATE_CACHE(re, &s->gb);
1565                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1566                 if (level == -128) {
1567                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1568                 } else if (level == 0) {
1569                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1570                 }
1571                 i += run;
1572                 j = scantable[i];
1573                 if(level<0){
1574                     level= -level;
1575                     level= (level*qscale*quant_matrix[j])>>4;
1576                     level= (level-1)|1;
1577                     level= -level;
1578                 }else{
1579                     level= (level*qscale*quant_matrix[j])>>4;
1580                     level= (level-1)|1;
1581                 }
1582             }
1583             if (i > 63){
1584                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1585                 return -1;
1586             }
1587
1588             block[j] = level;
1589         }
1590         CLOSE_READER(re, &s->gb);
1591     }
1592     s->block_last_index[n] = i;
1593    return 0;
1594 }
1595
1596 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1597                                DCTELEM *block,
1598                                int n)
1599 {
1600     int level, i, j, run;
1601     RLTable *rl = &rl_mpeg1;
1602     uint8_t * const scantable= s->intra_scantable.permutated;
1603     const uint16_t *quant_matrix= s->inter_matrix;
1604     const int qscale= s->qscale;
1605
1606     {
1607         OPEN_READER(re, &s->gb);
1608         i = -1;
1609         /* special case for the first coef. no need to add a second vlc table */
1610         UPDATE_CACHE(re, &s->gb);
1611         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1612             level= (3*qscale*quant_matrix[0])>>5;
1613             level= (level-1)|1;
1614             if(GET_CACHE(re, &s->gb)&0x40000000)
1615                 level= -level;
1616             block[0] = level;
1617             i++;
1618             SKIP_BITS(re, &s->gb, 2);
1619             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1620                 goto end;
1621         }
1622
1623         /* now quantify & encode AC coefs */
1624         for(;;) {
1625             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1626
1627             if(level != 0) {
1628                 i += run;
1629                 j = scantable[i];
1630                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1631                 level= (level-1)|1;
1632                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1633                 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, 8); SKIP_BITS(re, &s->gb, 8);
1639                 if (level == -128) {
1640                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1641                 } else if (level == 0) {
1642                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1643                 }
1644                 i += run;
1645                 j = scantable[i];
1646                 if(level<0){
1647                     level= -level;
1648                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1649                     level= (level-1)|1;
1650                     level= -level;
1651                 }else{
1652                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1653                     level= (level-1)|1;
1654                 }
1655             }
1656             if (i > 63){
1657                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1658                 return -1;
1659             }
1660
1661             block[j] = level;
1662             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1663                 break;
1664             UPDATE_CACHE(re, &s->gb);
1665         }
1666 end:
1667         LAST_SKIP_BITS(re, &s->gb, 2);
1668         CLOSE_READER(re, &s->gb);
1669     }
1670     s->block_last_index[n] = i;
1671     return 0;
1672 }
1673
1674 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1675 {
1676     int level, i, j, run;
1677     RLTable *rl = &rl_mpeg1;
1678     uint8_t * const scantable= s->intra_scantable.permutated;
1679     const int qscale= s->qscale;
1680
1681     {
1682         OPEN_READER(re, &s->gb);
1683         i = -1;
1684         /* special case for the first coef. no need to add a second vlc table */
1685         UPDATE_CACHE(re, &s->gb);
1686         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1687             level= (3*qscale)>>1;
1688             level= (level-1)|1;
1689             if(GET_CACHE(re, &s->gb)&0x40000000)
1690                 level= -level;
1691             block[0] = level;
1692             i++;
1693             SKIP_BITS(re, &s->gb, 2);
1694             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1695                 goto end;
1696         }
1697
1698         /* now quantify & encode AC coefs */
1699         for(;;) {
1700             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1701
1702             if(level != 0) {
1703                 i += run;
1704                 j = scantable[i];
1705                 level= ((level*2+1)*qscale)>>1;
1706                 level= (level-1)|1;
1707                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1708                 SKIP_BITS(re, &s->gb, 1);
1709             } else {
1710                 /* escape */
1711                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1712                 UPDATE_CACHE(re, &s->gb);
1713                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1714                 if (level == -128) {
1715                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1716                 } else if (level == 0) {
1717                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1718                 }
1719                 i += run;
1720                 j = scantable[i];
1721                 if(level<0){
1722                     level= -level;
1723                     level= ((level*2+1)*qscale)>>1;
1724                     level= (level-1)|1;
1725                     level= -level;
1726                 }else{
1727                     level= ((level*2+1)*qscale)>>1;
1728                     level= (level-1)|1;
1729                 }
1730             }
1731
1732             block[j] = level;
1733             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1734                 break;
1735             UPDATE_CACHE(re, &s->gb);
1736         }
1737 end:
1738         LAST_SKIP_BITS(re, &s->gb, 2);
1739         CLOSE_READER(re, &s->gb);
1740     }
1741     s->block_last_index[n] = i;
1742     return 0;
1743 }
1744
1745
1746 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1747                                DCTELEM *block,
1748                                int n)
1749 {
1750     int level, i, j, run;
1751     RLTable *rl = &rl_mpeg1;
1752     uint8_t * const scantable= s->intra_scantable.permutated;
1753     const uint16_t *quant_matrix;
1754     const int qscale= s->qscale;
1755     int mismatch;
1756
1757     mismatch = 1;
1758
1759     {
1760         OPEN_READER(re, &s->gb);
1761         i = -1;
1762         if (n < 4)
1763             quant_matrix = s->inter_matrix;
1764         else
1765             quant_matrix = s->chroma_inter_matrix;
1766
1767         /* special case for the first coef. no need to add a second vlc table */
1768         UPDATE_CACHE(re, &s->gb);
1769         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1770             level= (3*qscale*quant_matrix[0])>>5;
1771             if(GET_CACHE(re, &s->gb)&0x40000000)
1772                 level= -level;
1773             block[0] = level;
1774             mismatch ^= level;
1775             i++;
1776             SKIP_BITS(re, &s->gb, 2);
1777             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1778                 goto end;
1779         }
1780
1781         /* now quantify & encode AC coefs */
1782         for(;;) {
1783             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1784
1785             if(level != 0) {
1786                 i += run;
1787                 j = scantable[i];
1788                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1789                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1790                 SKIP_BITS(re, &s->gb, 1);
1791             } else {
1792                 /* escape */
1793                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1794                 UPDATE_CACHE(re, &s->gb);
1795                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1796
1797                 i += run;
1798                 j = scantable[i];
1799                 if(level<0){
1800                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1801                     level= -level;
1802                 }else{
1803                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1804                 }
1805             }
1806             if (i > 63){
1807                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1808                 return -1;
1809             }
1810
1811             mismatch ^= level;
1812             block[j] = level;
1813             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1814                 break;
1815             UPDATE_CACHE(re, &s->gb);
1816         }
1817 end:
1818         LAST_SKIP_BITS(re, &s->gb, 2);
1819         CLOSE_READER(re, &s->gb);
1820     }
1821     block[63] ^= (mismatch & 1);
1822
1823     s->block_last_index[n] = i;
1824     return 0;
1825 }
1826
1827 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1828                                DCTELEM *block,
1829                                int n)
1830 {
1831     int level, i, j, run;
1832     RLTable *rl = &rl_mpeg1;
1833     uint8_t * const scantable= s->intra_scantable.permutated;
1834     const int qscale= s->qscale;
1835     OPEN_READER(re, &s->gb);
1836     i = -1;
1837
1838     /* special case for the first coef. no need to add a second vlc table */
1839     UPDATE_CACHE(re, &s->gb);
1840     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1841         level= (3*qscale)>>1;
1842         if(GET_CACHE(re, &s->gb)&0x40000000)
1843             level= -level;
1844         block[0] = level;
1845         i++;
1846         SKIP_BITS(re, &s->gb, 2);
1847         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1848             goto end;
1849     }
1850
1851     /* now quantify & encode AC coefs */
1852     for(;;) {
1853         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1854
1855         if(level != 0) {
1856             i += run;
1857             j = scantable[i];
1858             level= ((level*2+1)*qscale)>>1;
1859             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1860             SKIP_BITS(re, &s->gb, 1);
1861         } else {
1862             /* escape */
1863             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1864             UPDATE_CACHE(re, &s->gb);
1865             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1866
1867             i += run;
1868             j = scantable[i];
1869             if(level<0){
1870                 level= ((-level*2+1)*qscale)>>1;
1871                 level= -level;
1872             }else{
1873                 level= ((level*2+1)*qscale)>>1;
1874             }
1875         }
1876
1877         block[j] = level;
1878         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1879             break;
1880         UPDATE_CACHE(re, &s->gb);
1881     }
1882 end:
1883     LAST_SKIP_BITS(re, &s->gb, 2);
1884     CLOSE_READER(re, &s->gb);
1885     s->block_last_index[n] = i;
1886     return 0;
1887 }
1888
1889
1890 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1891                                DCTELEM *block,
1892                                int n)
1893 {
1894     int level, dc, diff, i, j, run;
1895     int component;
1896     RLTable *rl;
1897     uint8_t * const scantable= s->intra_scantable.permutated;
1898     const uint16_t *quant_matrix;
1899     const int qscale= s->qscale;
1900     int mismatch;
1901
1902     /* DC coef */
1903     if (n < 4){
1904         quant_matrix = s->intra_matrix;
1905         component = 0;
1906     }else{
1907         quant_matrix = s->chroma_intra_matrix;
1908         component = (n&1) + 1;
1909     }
1910     diff = decode_dc(&s->gb, component);
1911     if (diff >= 0xffff)
1912         return -1;
1913     dc = s->last_dc[component];
1914     dc += diff;
1915     s->last_dc[component] = dc;
1916     block[0] = dc << (3 - s->intra_dc_precision);
1917     dprintf("dc=%d\n", block[0]);
1918     mismatch = block[0] ^ 1;
1919     i = 0;
1920     if (s->intra_vlc_format)
1921         rl = &rl_mpeg2;
1922     else
1923         rl = &rl_mpeg1;
1924
1925     {
1926         OPEN_READER(re, &s->gb);
1927         /* now quantify & encode AC coefs */
1928         for(;;) {
1929             UPDATE_CACHE(re, &s->gb);
1930             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1931
1932             if(level == 127){
1933                 break;
1934             } else if(level != 0) {
1935                 i += run;
1936                 j = scantable[i];
1937                 level= (level*qscale*quant_matrix[j])>>4;
1938                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1939                 LAST_SKIP_BITS(re, &s->gb, 1);
1940             } else {
1941                 /* escape */
1942                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1943                 UPDATE_CACHE(re, &s->gb);
1944                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1945                 i += run;
1946                 j = scantable[i];
1947                 if(level<0){
1948                     level= (-level*qscale*quant_matrix[j])>>4;
1949                     level= -level;
1950                 }else{
1951                     level= (level*qscale*quant_matrix[j])>>4;
1952                 }
1953             }
1954             if (i > 63){
1955                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1956                 return -1;
1957             }
1958
1959             mismatch^= level;
1960             block[j] = level;
1961         }
1962         CLOSE_READER(re, &s->gb);
1963     }
1964     block[63]^= mismatch&1;
1965
1966     s->block_last_index[n] = i;
1967     return 0;
1968 }
1969
1970 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1971                                DCTELEM *block,
1972                                int n)
1973 {
1974     int level, dc, diff, j, run;
1975     int component;
1976     RLTable *rl;
1977     uint8_t * scantable= s->intra_scantable.permutated;
1978     const uint16_t *quant_matrix;
1979     const int qscale= s->qscale;
1980
1981     /* DC coef */
1982     if (n < 4){
1983         quant_matrix = s->intra_matrix;
1984         component = 0;
1985     }else{
1986         quant_matrix = s->chroma_intra_matrix;
1987         component = (n&1) + 1;
1988     }
1989     diff = decode_dc(&s->gb, component);
1990     if (diff >= 0xffff)
1991         return -1;
1992     dc = s->last_dc[component];
1993     dc += diff;
1994     s->last_dc[component] = dc;
1995     block[0] = dc << (3 - s->intra_dc_precision);
1996     if (s->intra_vlc_format)
1997         rl = &rl_mpeg2;
1998     else
1999         rl = &rl_mpeg1;
2000
2001     {
2002         OPEN_READER(re, &s->gb);
2003         /* now quantify & encode AC coefs */
2004         for(;;) {
2005             UPDATE_CACHE(re, &s->gb);
2006             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2007
2008             if(level == 127){
2009                 break;
2010             } else if(level != 0) {
2011                 scantable += run;
2012                 j = *scantable;
2013                 level= (level*qscale*quant_matrix[j])>>4;
2014                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2015                 LAST_SKIP_BITS(re, &s->gb, 1);
2016             } else {
2017                 /* escape */
2018                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2019                 UPDATE_CACHE(re, &s->gb);
2020                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2021                 scantable += run;
2022                 j = *scantable;
2023                 if(level<0){
2024                     level= (-level*qscale*quant_matrix[j])>>4;
2025                     level= -level;
2026                 }else{
2027                     level= (level*qscale*quant_matrix[j])>>4;
2028                 }
2029             }
2030
2031             block[j] = level;
2032         }
2033         CLOSE_READER(re, &s->gb);
2034     }
2035
2036     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2037     return 0;
2038 }
2039
2040 typedef struct Mpeg1Context {
2041     MpegEncContext mpeg_enc_ctx;
2042     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2043     int repeat_field; /* true if we must repeat the field */
2044     AVPanScan pan_scan; /** some temporary storage for the panscan */
2045     int slice_count;
2046     int swap_uv;//indicate VCR2
2047     int save_aspect_info;
2048     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2049
2050 } Mpeg1Context;
2051
2052 static int mpeg_decode_init(AVCodecContext *avctx)
2053 {
2054     Mpeg1Context *s = avctx->priv_data;
2055     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2056     int i;
2057
2058     //we need some parmutation to store
2059     //matrixes, until MPV_common_init()
2060     //set the real permutatuon
2061     for(i=0;i<64;i++)
2062        s2->dsp.idct_permutation[i]=i;
2063
2064     MPV_decode_defaults(s2);
2065
2066     s->mpeg_enc_ctx.avctx= avctx;
2067     s->mpeg_enc_ctx.flags= avctx->flags;
2068     s->mpeg_enc_ctx.flags2= avctx->flags2;
2069     common_init(&s->mpeg_enc_ctx);
2070     init_vlcs();
2071
2072     s->mpeg_enc_ctx_allocated = 0;
2073     s->mpeg_enc_ctx.picture_number = 0;
2074     s->repeat_field = 0;
2075     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2076     return 0;
2077 }
2078
2079 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2080                                      const uint8_t *new_perm){
2081     uint16_t temp_matrix[64];
2082     int i;
2083
2084     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2085
2086     for(i=0;i<64;i++){
2087         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2088     }
2089 }
2090
2091 //Call this function when we know all parameters
2092 //it may be called in different places for mpeg1 and mpeg2
2093 static int mpeg_decode_postinit(AVCodecContext *avctx){
2094     Mpeg1Context *s1 = avctx->priv_data;
2095     MpegEncContext *s = &s1->mpeg_enc_ctx;
2096     uint8_t old_permutation[64];
2097
2098     if (
2099         (s1->mpeg_enc_ctx_allocated == 0)||
2100         avctx->coded_width  != s->width ||
2101         avctx->coded_height != s->height||
2102         s1->save_aspect_info != s->aspect_ratio_info||
2103         0)
2104     {
2105
2106         if (s1->mpeg_enc_ctx_allocated) {
2107             ParseContext pc= s->parse_context;
2108             s->parse_context.buffer=0;
2109             MPV_common_end(s);
2110             s->parse_context= pc;
2111         }
2112
2113         if( (s->width == 0 )||(s->height == 0))
2114             return -2;
2115
2116         avcodec_set_dimensions(avctx, s->width, s->height);
2117         avctx->bit_rate = s->bit_rate;
2118         s1->save_aspect_info = s->aspect_ratio_info;
2119
2120      //low_delay may be forced, in this case we will have B frames
2121      //that behave like P frames
2122         avctx->has_b_frames = !(s->low_delay);
2123
2124         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2125             //mpeg1 fps
2126             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2127             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2128             //mpeg1 aspect
2129             avctx->sample_aspect_ratio= av_d2q(
2130                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2131
2132         }else{//mpeg2
2133         //mpeg2 fps
2134             av_reduce(
2135                 &s->avctx->time_base.den,
2136                 &s->avctx->time_base.num,
2137                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2138                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2139                 1<<30);
2140         //mpeg2 aspect
2141             if(s->aspect_ratio_info > 1){
2142                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2143                     s->avctx->sample_aspect_ratio=
2144                         av_div_q(
2145                          mpeg2_aspect[s->aspect_ratio_info],
2146                          (AVRational){s->width, s->height}
2147                          );
2148                 }else{
2149                     s->avctx->sample_aspect_ratio=
2150                         av_div_q(
2151                          mpeg2_aspect[s->aspect_ratio_info],
2152                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2153                         );
2154                 }
2155             }else{
2156                 s->avctx->sample_aspect_ratio=
2157                     mpeg2_aspect[s->aspect_ratio_info];
2158             }
2159         }//mpeg2
2160
2161         if(avctx->xvmc_acceleration){
2162             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2163         }else{
2164             if(s->chroma_format <  2){
2165                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2166             }else
2167             if(s->chroma_format == 2){
2168                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2169             }else
2170             if(s->chroma_format >  2){
2171                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2172             }
2173         }
2174         //until then pix_fmt may be changed right after codec init
2175         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2176             if( avctx->idct_algo == FF_IDCT_AUTO )
2177                 avctx->idct_algo = FF_IDCT_SIMPLE;
2178
2179         //quantization matrixes may need reordering
2180         //if dct permutation is changed
2181         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2182
2183         if (MPV_common_init(s) < 0)
2184             return -2;
2185
2186         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2187         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2188         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2189         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2190
2191         s1->mpeg_enc_ctx_allocated = 1;
2192     }
2193     return 0;
2194 }
2195
2196 static int mpeg1_decode_picture(AVCodecContext *avctx,
2197                                 const uint8_t *buf, int buf_size)
2198 {
2199     Mpeg1Context *s1 = avctx->priv_data;
2200     MpegEncContext *s = &s1->mpeg_enc_ctx;
2201     int ref, f_code, vbv_delay;
2202
2203     if(mpeg_decode_postinit(s->avctx) < 0)
2204        return -2;
2205
2206     init_get_bits(&s->gb, buf, buf_size*8);
2207
2208     ref = get_bits(&s->gb, 10); /* temporal ref */
2209     s->pict_type = get_bits(&s->gb, 3);
2210     if(s->pict_type == 0 || s->pict_type > 3)
2211         return -1;
2212
2213     vbv_delay= get_bits(&s->gb, 16);
2214     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2215         s->full_pel[0] = get_bits1(&s->gb);
2216         f_code = get_bits(&s->gb, 3);
2217         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2218             return -1;
2219         s->mpeg_f_code[0][0] = f_code;
2220         s->mpeg_f_code[0][1] = f_code;
2221     }
2222     if (s->pict_type == B_TYPE) {
2223         s->full_pel[1] = get_bits1(&s->gb);
2224         f_code = get_bits(&s->gb, 3);
2225         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2226             return -1;
2227         s->mpeg_f_code[1][0] = f_code;
2228         s->mpeg_f_code[1][1] = f_code;
2229     }
2230     s->current_picture.pict_type= s->pict_type;
2231     s->current_picture.key_frame= s->pict_type == I_TYPE;
2232
2233     if(avctx->debug & FF_DEBUG_PICT_INFO)
2234         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2235
2236     s->y_dc_scale = 8;
2237     s->c_dc_scale = 8;
2238     s->first_slice = 1;
2239     return 0;
2240 }
2241
2242 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2243 {
2244     MpegEncContext *s= &s1->mpeg_enc_ctx;
2245     int horiz_size_ext, vert_size_ext;
2246     int bit_rate_ext;
2247
2248     skip_bits(&s->gb, 1); /* profil and level esc*/
2249     s->avctx->profile= get_bits(&s->gb, 3);
2250     s->avctx->level= get_bits(&s->gb, 4);
2251     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2252     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2253     horiz_size_ext = get_bits(&s->gb, 2);
2254     vert_size_ext = get_bits(&s->gb, 2);
2255     s->width |= (horiz_size_ext << 12);
2256     s->height |= (vert_size_ext << 12);
2257     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2258     s->bit_rate += (bit_rate_ext << 18) * 400;
2259     skip_bits1(&s->gb); /* marker */
2260     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2261
2262     s->low_delay = get_bits1(&s->gb);
2263     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2264
2265     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2266     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2267
2268     dprintf("sequence extension\n");
2269     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2270     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2271
2272     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2273         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2274                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2275
2276 }
2277
2278 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2279 {
2280     MpegEncContext *s= &s1->mpeg_enc_ctx;
2281     int color_description, w, h;
2282
2283     skip_bits(&s->gb, 3); /* video format */
2284     color_description= get_bits1(&s->gb);
2285     if(color_description){
2286         skip_bits(&s->gb, 8); /* color primaries */
2287         skip_bits(&s->gb, 8); /* transfer_characteristics */
2288         skip_bits(&s->gb, 8); /* matrix_coefficients */
2289     }
2290     w= get_bits(&s->gb, 14);
2291     skip_bits(&s->gb, 1); //marker
2292     h= get_bits(&s->gb, 14);
2293     skip_bits(&s->gb, 1); //marker
2294
2295     s1->pan_scan.width= 16*w;
2296     s1->pan_scan.height=16*h;
2297
2298     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2299         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2300 }
2301
2302 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2303 {
2304     MpegEncContext *s= &s1->mpeg_enc_ctx;
2305     int i,nofco;
2306
2307     nofco = 1;
2308     if(s->progressive_sequence){
2309         if(s->repeat_first_field){
2310             nofco++;
2311             if(s->top_field_first)
2312                 nofco++;
2313         }
2314     }else{
2315         if(s->picture_structure == PICT_FRAME){
2316             nofco++;
2317             if(s->repeat_first_field)
2318                 nofco++;
2319         }
2320     }
2321     for(i=0; i<nofco; i++){
2322         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2323         skip_bits(&s->gb, 1); //marker
2324         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2325         skip_bits(&s->gb, 1); //marker
2326     }
2327
2328     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2329         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2330             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2331             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2332             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2333         );
2334 }
2335
2336 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2337 {
2338     int i, v, j;
2339
2340     dprintf("matrix extension\n");
2341
2342     if (get_bits1(&s->gb)) {
2343         for(i=0;i<64;i++) {
2344             v = get_bits(&s->gb, 8);
2345             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2346             s->intra_matrix[j] = v;
2347             s->chroma_intra_matrix[j] = v;
2348         }
2349     }
2350     if (get_bits1(&s->gb)) {
2351         for(i=0;i<64;i++) {
2352             v = get_bits(&s->gb, 8);
2353             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2354             s->inter_matrix[j] = v;
2355             s->chroma_inter_matrix[j] = v;
2356         }
2357     }
2358     if (get_bits1(&s->gb)) {
2359         for(i=0;i<64;i++) {
2360             v = get_bits(&s->gb, 8);
2361             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2362             s->chroma_intra_matrix[j] = v;
2363         }
2364     }
2365     if (get_bits1(&s->gb)) {
2366         for(i=0;i<64;i++) {
2367             v = get_bits(&s->gb, 8);
2368             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2369             s->chroma_inter_matrix[j] = v;
2370         }
2371     }
2372 }
2373
2374 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2375 {
2376     s->full_pel[0] = s->full_pel[1] = 0;
2377     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2378     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2379     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2380     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2381     s->intra_dc_precision = get_bits(&s->gb, 2);
2382     s->picture_structure = get_bits(&s->gb, 2);
2383     s->top_field_first = get_bits1(&s->gb);
2384     s->frame_pred_frame_dct = get_bits1(&s->gb);
2385     s->concealment_motion_vectors = get_bits1(&s->gb);
2386     s->q_scale_type = get_bits1(&s->gb);
2387     s->intra_vlc_format = get_bits1(&s->gb);
2388     s->alternate_scan = get_bits1(&s->gb);
2389     s->repeat_first_field = get_bits1(&s->gb);
2390     s->chroma_420_type = get_bits1(&s->gb);
2391     s->progressive_frame = get_bits1(&s->gb);
2392
2393     if(s->picture_structure == PICT_FRAME){
2394         s->first_field=0;
2395         s->v_edge_pos= 16*s->mb_height;
2396     }else{
2397         s->first_field ^= 1;
2398         s->v_edge_pos=  8*s->mb_height;
2399         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2400     }
2401
2402     if(s->alternate_scan){
2403         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2404         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2405     }else{
2406         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2407         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2408     }
2409
2410     /* composite display not parsed */
2411     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2412     dprintf("picture_structure=%d\n", s->picture_structure);
2413     dprintf("top field first=%d\n", s->top_field_first);
2414     dprintf("repeat first field=%d\n", s->repeat_first_field);
2415     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2416     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2417     dprintf("alternate_scan=%d\n", s->alternate_scan);
2418     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2419     dprintf("progressive_frame=%d\n", s->progressive_frame);
2420 }
2421
2422 static void mpeg_decode_extension(AVCodecContext *avctx,
2423                                   const uint8_t *buf, int buf_size)
2424 {
2425     Mpeg1Context *s1 = avctx->priv_data;
2426     MpegEncContext *s = &s1->mpeg_enc_ctx;
2427     int ext_type;
2428
2429     init_get_bits(&s->gb, buf, buf_size*8);
2430
2431     ext_type = get_bits(&s->gb, 4);
2432     switch(ext_type) {
2433     case 0x1:
2434         mpeg_decode_sequence_extension(s1);
2435         break;
2436     case 0x2:
2437         mpeg_decode_sequence_display_extension(s1);
2438         break;
2439     case 0x3:
2440         mpeg_decode_quant_matrix_extension(s);
2441         break;
2442     case 0x7:
2443         mpeg_decode_picture_display_extension(s1);
2444         break;
2445     case 0x8:
2446         mpeg_decode_picture_coding_extension(s);
2447         break;
2448     }
2449 }
2450
2451 static void exchange_uv(MpegEncContext *s){
2452     short * tmp = s->pblocks[4];
2453     s->pblocks[4] = s->pblocks[5];
2454     s->pblocks[5] = tmp;
2455 }
2456
2457 static int mpeg_field_start(MpegEncContext *s){
2458     AVCodecContext *avctx= s->avctx;
2459     Mpeg1Context *s1 = (Mpeg1Context*)s;
2460
2461     /* start frame decoding */
2462     if(s->first_field || s->picture_structure==PICT_FRAME){
2463         if(MPV_frame_start(s, avctx) < 0)
2464             return -1;
2465
2466         ff_er_frame_start(s);
2467
2468         /* first check if we must repeat the frame */
2469         s->current_picture_ptr->repeat_pict = 0;
2470         if (s->repeat_first_field) {
2471             if (s->progressive_sequence) {
2472                 if (s->top_field_first)
2473                     s->current_picture_ptr->repeat_pict = 4;
2474                 else
2475                     s->current_picture_ptr->repeat_pict = 2;
2476             } else if (s->progressive_frame) {
2477                 s->current_picture_ptr->repeat_pict = 1;
2478             }
2479         }
2480
2481         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2482     }else{ //second field
2483             int i;
2484
2485             if(!s->current_picture_ptr){
2486                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2487                 return -1;
2488             }
2489
2490             for(i=0; i<4; i++){
2491                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2492                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2493                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2494                 }
2495             }
2496     }
2497 #ifdef HAVE_XVMC
2498 // MPV_frame_start will call this function too,
2499 // but we need to call it on every field
2500     if(s->avctx->xvmc_acceleration)
2501          XVMC_field_start(s,avctx);
2502 #endif
2503
2504     return 0;
2505 }
2506
2507 #define DECODE_SLICE_ERROR -1
2508 #define DECODE_SLICE_OK 0
2509
2510 /**
2511  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2512  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2513  *         DECODE_SLICE_OK if this slice is ok<br>
2514  */
2515 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2516                              const uint8_t **buf, int buf_size)
2517 {
2518     MpegEncContext *s = &s1->mpeg_enc_ctx;
2519     AVCodecContext *avctx= s->avctx;
2520     int ret;
2521     const int field_pic= s->picture_structure != PICT_FRAME;
2522     const int lowres= s->avctx->lowres;
2523
2524     s->resync_mb_x=
2525     s->resync_mb_y= -1;
2526
2527     if (mb_y<<field_pic >= s->mb_height){
2528         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2529         return -1;
2530     }
2531
2532     init_get_bits(&s->gb, *buf, buf_size*8);
2533
2534     ff_mpeg1_clean_buffers(s);
2535     s->interlaced_dct = 0;
2536
2537     s->qscale = get_qscale(s);
2538
2539     if(s->qscale == 0){
2540         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2541         return -1;
2542     }
2543
2544     /* extra slice info */
2545     while (get_bits1(&s->gb) != 0) {
2546         skip_bits(&s->gb, 8);
2547     }
2548
2549     s->mb_x=0;
2550
2551     for(;;) {
2552         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2553         if (code < 0){
2554             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2555             return -1;
2556         }
2557         if (code >= 33) {
2558             if (code == 33) {
2559                 s->mb_x += 33;
2560             }
2561             /* otherwise, stuffing, nothing to do */
2562         } else {
2563             s->mb_x += code;
2564             break;
2565         }
2566     }
2567
2568     s->resync_mb_x= s->mb_x;
2569     s->resync_mb_y= s->mb_y= mb_y;
2570     s->mb_skip_run= 0;
2571     ff_init_block_index(s);
2572
2573     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2574         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2575              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",
2576                  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],
2577                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2578                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2579                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2580                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2581         }
2582     }
2583
2584     for(;;) {
2585 #ifdef HAVE_XVMC
2586         //one 1 we memcpy blocks in xvmcvideo
2587         if(s->avctx->xvmc_acceleration > 1)
2588             XVMC_init_block(s);//set s->block
2589 #endif
2590
2591         ret = mpeg_decode_mb(s, s->block);
2592         s->chroma_qscale= s->qscale;
2593
2594         dprintf("ret=%d\n", ret);
2595         if (ret < 0)
2596             return -1;
2597
2598         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2599             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2600             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2601             int motion_x, motion_y, dir, i;
2602             if(field_pic && !s->first_field)
2603                 xy += wrap/2;
2604
2605             for(i=0; i<2; i++){
2606                 for(dir=0; dir<2; dir++){
2607                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2608                         motion_x = motion_y = 0;
2609                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2610                         motion_x = s->mv[dir][0][0];
2611                         motion_y = s->mv[dir][0][1];
2612                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2613                         motion_x = s->mv[dir][i][0];
2614                         motion_y = s->mv[dir][i][1];
2615                     }
2616
2617                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2618                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2619                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2620                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2621                     s->current_picture.ref_index [dir][xy    ]=
2622                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2623                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2624                 }
2625                 xy += wrap;
2626             }
2627         }
2628
2629         s->dest[0] += 16 >> lowres;
2630         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2631         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2632
2633         MPV_decode_mb(s, s->block);
2634
2635         if (++s->mb_x >= s->mb_width) {
2636             const int mb_size= 16>>s->avctx->lowres;
2637
2638             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2639
2640             s->mb_x = 0;
2641             s->mb_y++;
2642
2643             if(s->mb_y<<field_pic >= s->mb_height){
2644                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2645                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2646                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2647                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2648
2649                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2650                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2651                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2652                     return -1;
2653                 }else
2654                     goto eos;
2655             }
2656
2657             ff_init_block_index(s);
2658         }
2659
2660         /* skip mb handling */
2661         if (s->mb_skip_run == -1) {
2662             /* read again increment */
2663             s->mb_skip_run = 0;
2664             for(;;) {
2665                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2666                 if (code < 0){
2667                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2668                     return -1;
2669                 }
2670                 if (code >= 33) {
2671                     if (code == 33) {
2672                         s->mb_skip_run += 33;
2673                     }else if(code == 35){
2674                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2675                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2676                             return -1;
2677                         }
2678                         goto eos; /* end of slice */
2679                     }
2680                     /* otherwise, stuffing, nothing to do */
2681                 } else {
2682                     s->mb_skip_run += code;
2683                     break;
2684                 }
2685             }
2686         }
2687     }
2688 eos: // end of slice
2689     *buf += get_bits_count(&s->gb)/8 - 1;
2690 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2691     return 0;
2692 }
2693
2694 static int slice_decode_thread(AVCodecContext *c, void *arg){
2695     MpegEncContext *s= arg;
2696     const uint8_t *buf= s->gb.buffer;
2697     int mb_y= s->start_mb_y;
2698
2699     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2700
2701     for(;;){
2702         uint32_t start_code;
2703         int ret;
2704
2705         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2706         emms_c();
2707 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2708 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
2709         if(ret < 0){
2710             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2711                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2712         }else{
2713             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
2714         }
2715
2716         if(s->mb_y == s->end_mb_y)
2717             return 0;
2718
2719         start_code= -1;
2720         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2721         mb_y= start_code - SLICE_MIN_START_CODE;
2722         if(mb_y < 0 || mb_y >= s->end_mb_y)
2723             return -1;
2724     }
2725
2726     return 0; //not reached
2727 }
2728
2729 /**
2730  * handles slice ends.
2731  * @return 1 if it seems to be the last slice of
2732  */
2733 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2734 {
2735     Mpeg1Context *s1 = avctx->priv_data;
2736     MpegEncContext *s = &s1->mpeg_enc_ctx;
2737
2738     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2739         return 0;
2740
2741 #ifdef HAVE_XVMC
2742     if(s->avctx->xvmc_acceleration)
2743         XVMC_field_end(s);
2744 #endif
2745     /* end of slice reached */
2746     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2747         /* end of image */
2748
2749         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2750
2751         ff_er_frame_end(s);
2752
2753         MPV_frame_end(s);
2754
2755         if (s->pict_type == B_TYPE || s->low_delay) {
2756             *pict= *(AVFrame*)s->current_picture_ptr;
2757             ff_print_debug_info(s, pict);
2758         } else {
2759             s->picture_number++;
2760             /* latency of 1 frame for I and P frames */
2761             /* XXX: use another variable than picture_number */
2762             if (s->last_picture_ptr != NULL) {
2763                 *pict= *(AVFrame*)s->last_picture_ptr;
2764                  ff_print_debug_info(s, pict);
2765             }
2766         }
2767
2768         return 1;
2769     } else {
2770         return 0;
2771     }
2772 }
2773
2774 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2775                                  const uint8_t *buf, int buf_size)
2776 {
2777     Mpeg1Context *s1 = avctx->priv_data;
2778     MpegEncContext *s = &s1->mpeg_enc_ctx;
2779     int width,height;
2780     int i, v, j;
2781
2782     init_get_bits(&s->gb, buf, buf_size*8);
2783
2784     width = get_bits(&s->gb, 12);
2785     height = get_bits(&s->gb, 12);
2786     if (width <= 0 || height <= 0 ||
2787         (width % 2) != 0 || (height % 2) != 0)
2788         return -1;
2789     s->aspect_ratio_info= get_bits(&s->gb, 4);
2790     if (s->aspect_ratio_info == 0)
2791         return -1;
2792     s->frame_rate_index = get_bits(&s->gb, 4);
2793     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2794         return -1;
2795     s->bit_rate = get_bits(&s->gb, 18) * 400;
2796     if (get_bits1(&s->gb) == 0) /* marker */
2797         return -1;
2798     s->width = width;
2799     s->height = height;
2800
2801     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2802     skip_bits(&s->gb, 1);
2803
2804     /* get matrix */
2805     if (get_bits1(&s->gb)) {
2806         for(i=0;i<64;i++) {
2807             v = get_bits(&s->gb, 8);
2808             if(v==0){
2809                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2810                 return -1;
2811             }
2812             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2813             s->intra_matrix[j] = v;
2814             s->chroma_intra_matrix[j] = v;
2815         }
2816 #ifdef DEBUG
2817         dprintf("intra matrix present\n");
2818         for(i=0;i<64;i++)
2819             dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2820         dprintf("\n");
2821 #endif
2822     } else {
2823         for(i=0;i<64;i++) {
2824             j = s->dsp.idct_permutation[i];
2825             v = ff_mpeg1_default_intra_matrix[i];
2826             s->intra_matrix[j] = v;
2827             s->chroma_intra_matrix[j] = v;
2828         }
2829     }
2830     if (get_bits1(&s->gb)) {
2831         for(i=0;i<64;i++) {
2832             v = get_bits(&s->gb, 8);
2833             if(v==0){
2834                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2835                 return -1;
2836             }
2837             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2838             s->inter_matrix[j] = v;
2839             s->chroma_inter_matrix[j] = v;
2840         }
2841 #ifdef DEBUG
2842         dprintf("non intra matrix present\n");
2843         for(i=0;i<64;i++)
2844             dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2845         dprintf("\n");
2846 #endif
2847     } else {
2848         for(i=0;i<64;i++) {
2849             int j= s->dsp.idct_permutation[i];
2850             v = ff_mpeg1_default_non_intra_matrix[i];
2851             s->inter_matrix[j] = v;
2852             s->chroma_inter_matrix[j] = v;
2853         }
2854     }
2855
2856     if(show_bits(&s->gb, 23) != 0){
2857         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2858         return -1;
2859     }
2860
2861     /* we set mpeg2 parameters so that it emulates mpeg1 */
2862     s->progressive_sequence = 1;
2863     s->progressive_frame = 1;
2864     s->picture_structure = PICT_FRAME;
2865     s->frame_pred_frame_dct = 1;
2866     s->chroma_format = 1;
2867     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2868     avctx->sub_id = 1; /* indicates mpeg1 */
2869     s->out_format = FMT_MPEG1;
2870     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2871     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2872
2873     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2874         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2875                s->avctx->rc_buffer_size, s->bit_rate);
2876
2877     return 0;
2878 }
2879
2880 static int vcr2_init_sequence(AVCodecContext *avctx)
2881 {
2882     Mpeg1Context *s1 = avctx->priv_data;
2883     MpegEncContext *s = &s1->mpeg_enc_ctx;
2884     int i, v;
2885
2886     /* start new mpeg1 context decoding */
2887     s->out_format = FMT_MPEG1;
2888     if (s1->mpeg_enc_ctx_allocated) {
2889         MPV_common_end(s);
2890     }
2891     s->width  = avctx->coded_width;
2892     s->height = avctx->coded_height;
2893     avctx->has_b_frames= 0; //true?
2894     s->low_delay= 1;
2895
2896     if(avctx->xvmc_acceleration){
2897         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2898     }else{
2899         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2900     }
2901
2902     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2903         if( avctx->idct_algo == FF_IDCT_AUTO )
2904             avctx->idct_algo = FF_IDCT_SIMPLE;
2905
2906     if (MPV_common_init(s) < 0)
2907         return -1;
2908     exchange_uv(s);//common init reset pblocks, so we swap them here
2909     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2910     s1->mpeg_enc_ctx_allocated = 1;
2911
2912     for(i=0;i<64;i++) {
2913         int j= s->dsp.idct_permutation[i];
2914         v = ff_mpeg1_default_intra_matrix[i];
2915         s->intra_matrix[j] = v;
2916         s->chroma_intra_matrix[j] = v;
2917
2918         v = ff_mpeg1_default_non_intra_matrix[i];
2919         s->inter_matrix[j] = v;
2920         s->chroma_inter_matrix[j] = v;
2921     }
2922
2923     s->progressive_sequence = 1;
2924     s->progressive_frame = 1;
2925     s->picture_structure = PICT_FRAME;
2926     s->frame_pred_frame_dct = 1;
2927     s->chroma_format = 1;
2928     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2929     avctx->sub_id = 2; /* indicates mpeg2 */
2930     return 0;
2931 }
2932
2933
2934 static void mpeg_decode_user_data(AVCodecContext *avctx,
2935                                   const uint8_t *buf, int buf_size)
2936 {
2937     const uint8_t *p;
2938     int len, flags;
2939     p = buf;
2940     len = buf_size;
2941
2942     /* we parse the DTG active format information */
2943     if (len >= 5 &&
2944         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2945         flags = p[4];
2946         p += 5;
2947         len -= 5;
2948         if (flags & 0x80) {
2949             /* skip event id */
2950             if (len < 2)
2951                 return;
2952             p += 2;
2953             len -= 2;
2954         }
2955         if (flags & 0x40) {
2956             if (len < 1)
2957                 return;
2958             avctx->dtg_active_format = p[0] & 0x0f;
2959         }
2960     }
2961 }
2962
2963 static void mpeg_decode_gop(AVCodecContext *avctx,
2964                             const uint8_t *buf, int buf_size){
2965     Mpeg1Context *s1 = avctx->priv_data;
2966     MpegEncContext *s = &s1->mpeg_enc_ctx;
2967
2968     int drop_frame_flag;
2969     int time_code_hours, time_code_minutes;
2970     int time_code_seconds, time_code_pictures;
2971     int broken_link;
2972
2973     init_get_bits(&s->gb, buf, buf_size*8);
2974
2975     drop_frame_flag = get_bits1(&s->gb);
2976
2977     time_code_hours=get_bits(&s->gb,5);
2978     time_code_minutes = get_bits(&s->gb,6);
2979     skip_bits1(&s->gb);//marker bit
2980     time_code_seconds = get_bits(&s->gb,6);
2981     time_code_pictures = get_bits(&s->gb,6);
2982
2983     /*broken_link indicate that after editing the
2984       reference frames of the first B-Frames after GOP I-Frame
2985       are missing (open gop)*/
2986     broken_link = get_bits1(&s->gb);
2987
2988     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2989         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2990             time_code_hours, time_code_minutes, time_code_seconds,
2991             time_code_pictures, broken_link);
2992 }
2993 /**
2994  * finds the end of the current frame in the bitstream.
2995  * @return the position of the first byte of the next frame, or -1
2996  */
2997 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2998 {
2999     int i;
3000     uint32_t state= pc->state;
3001
3002     i=0;
3003     if(!pc->frame_start_found){
3004         for(i=0; i<buf_size; i++){
3005             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3006             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3007                 i++;
3008                 pc->frame_start_found=1;
3009                 break;
3010             }
3011         }
3012     }
3013
3014     if(pc->frame_start_found){
3015         /* EOF considered as end of frame */
3016         if (buf_size == 0)
3017             return 0;
3018         for(; i<buf_size; i++){
3019             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3020             if((state&0xFFFFFF00) == 0x100){
3021                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3022                     pc->frame_start_found=0;
3023                     pc->state=-1;
3024                     return i-3;
3025                 }
3026             }
3027         }
3028     }
3029     pc->state= state;
3030     return END_NOT_FOUND;
3031 }
3032
3033 /* handle buffering and image synchronisation */
3034 static int mpeg_decode_frame(AVCodecContext *avctx,
3035                              void *data, int *data_size,
3036                              uint8_t *buf, int buf_size)
3037 {
3038     Mpeg1Context *s = avctx->priv_data;
3039     const uint8_t *buf_end;
3040     const uint8_t *buf_ptr;
3041     uint32_t start_code;
3042     int ret, input_size;
3043     AVFrame *picture = data;
3044     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3045     dprintf("fill_buffer\n");
3046
3047     if (buf_size == 0) {
3048         /* special case for last picture */
3049         if (s2->low_delay==0 && s2->next_picture_ptr) {
3050             *picture= *(AVFrame*)s2->next_picture_ptr;
3051             s2->next_picture_ptr= NULL;
3052
3053             *data_size = sizeof(AVFrame);
3054         }
3055         return 0;
3056     }
3057
3058     if(s2->flags&CODEC_FLAG_TRUNCATED){
3059         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3060
3061         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3062             return buf_size;
3063     }
3064
3065     buf_ptr = buf;
3066     buf_end = buf + buf_size;
3067
3068 #if 0
3069     if (s->repeat_field % 2 == 1) {
3070         s->repeat_field++;
3071         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3072         //        s2->picture_number, s->repeat_field);
3073         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3074             *data_size = sizeof(AVPicture);
3075             goto the_end;
3076         }
3077     }
3078 #endif
3079
3080     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3081         vcr2_init_sequence(avctx);
3082
3083     s->slice_count= 0;
3084
3085     for(;;) {
3086         /* find start next code */
3087         start_code = -1;
3088         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3089         if (start_code > 0x1ff){
3090             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3091                 if(avctx->thread_count > 1){
3092                     int i;
3093
3094                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3095                     for(i=0; i<s->slice_count; i++)
3096                         s2->error_count += s2->thread_context[i]->error_count;
3097                 }
3098                 if (slice_end(avctx, picture)) {
3099                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3100                         *data_size = sizeof(AVPicture);
3101                 }
3102             }
3103             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3104         }
3105
3106         input_size = buf_end - buf_ptr;
3107
3108         if(avctx->debug & FF_DEBUG_STARTCODE){
3109             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3110         }
3111
3112         /* prepare data for next start code */
3113         switch(start_code) {
3114         case SEQ_START_CODE:
3115             mpeg1_decode_sequence(avctx, buf_ptr,
3116                                     input_size);
3117             break;
3118
3119         case PICTURE_START_CODE:
3120             /* we have a complete image : we try to decompress it */
3121             mpeg1_decode_picture(avctx,
3122                                     buf_ptr, input_size);
3123             break;
3124         case EXT_START_CODE:
3125             mpeg_decode_extension(avctx,
3126                                     buf_ptr, input_size);
3127             break;
3128         case USER_START_CODE:
3129             mpeg_decode_user_data(avctx,
3130                                     buf_ptr, input_size);
3131             break;
3132         case GOP_START_CODE:
3133             s2->first_field=0;
3134             mpeg_decode_gop(avctx,
3135                                     buf_ptr, input_size);
3136             break;
3137         default:
3138             if (start_code >= SLICE_MIN_START_CODE &&
3139                 start_code <= SLICE_MAX_START_CODE) {
3140                 int mb_y= start_code - SLICE_MIN_START_CODE;
3141
3142                 if(s2->last_picture_ptr==NULL){
3143                 /* skip b frames if we dont have reference frames */
3144                     if(s2->pict_type==B_TYPE) break;
3145                 /* skip P frames if we dont have reference frame no valid header */
3146 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3147                 }
3148                 /* skip b frames if we are in a hurry */
3149                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3150                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3151                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3152                     || avctx->skip_frame >= AVDISCARD_ALL)
3153                     break;
3154                 /* skip everything if we are in a hurry>=5 */
3155                 if(avctx->hurry_up>=5) break;
3156
3157                 if (!s->mpeg_enc_ctx_allocated) break;
3158
3159                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3160                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3161                         break;
3162                 }
3163
3164                 if(s2->first_slice){
3165                     s2->first_slice=0;
3166                             if(mpeg_field_start(s2) < 0)
3167                         return -1;
3168                     }
3169
3170                 if(avctx->thread_count > 1){
3171                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3172                     if(threshold <= mb_y){
3173                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3174
3175                         thread_context->start_mb_y= mb_y;
3176                         thread_context->end_mb_y  = s2->mb_height;
3177                         if(s->slice_count){
3178                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3179                             ff_update_duplicate_context(thread_context, s2);
3180                         }
3181                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3182                         s->slice_count++;
3183                     }
3184                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
3185                 }else{
3186                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3187                     emms_c();
3188
3189                     if(ret < 0){
3190                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3191                             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);
3192                     }else{
3193                         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);
3194                     }
3195                 }
3196             }
3197             break;
3198         }
3199     }
3200 }
3201
3202 static int mpeg_decode_end(AVCodecContext *avctx)
3203 {
3204     Mpeg1Context *s = avctx->priv_data;
3205
3206     if (s->mpeg_enc_ctx_allocated)
3207         MPV_common_end(&s->mpeg_enc_ctx);
3208     return 0;
3209 }
3210
3211 AVCodec mpeg1video_decoder = {
3212     "mpeg1video",
3213     CODEC_TYPE_VIDEO,
3214     CODEC_ID_MPEG1VIDEO,
3215     sizeof(Mpeg1Context),
3216     mpeg_decode_init,
3217     NULL,
3218     mpeg_decode_end,
3219     mpeg_decode_frame,
3220     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3221     .flush= ff_mpeg_flush,
3222 };
3223
3224 AVCodec mpeg2video_decoder = {
3225     "mpeg2video",
3226     CODEC_TYPE_VIDEO,
3227     CODEC_ID_MPEG2VIDEO,
3228     sizeof(Mpeg1Context),
3229     mpeg_decode_init,
3230     NULL,
3231     mpeg_decode_end,
3232     mpeg_decode_frame,
3233     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3234     .flush= ff_mpeg_flush,
3235 };
3236
3237 //legacy decoder
3238 AVCodec mpegvideo_decoder = {
3239     "mpegvideo",
3240     CODEC_TYPE_VIDEO,
3241     CODEC_ID_MPEG2VIDEO,
3242     sizeof(Mpeg1Context),
3243     mpeg_decode_init,
3244     NULL,
3245     mpeg_decode_end,
3246     mpeg_decode_frame,
3247     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3248     .flush= ff_mpeg_flush,
3249 };
3250
3251 #ifdef CONFIG_ENCODERS
3252
3253 AVCodec mpeg1video_encoder = {
3254     "mpeg1video",
3255     CODEC_TYPE_VIDEO,
3256     CODEC_ID_MPEG1VIDEO,
3257     sizeof(MpegEncContext),
3258     encode_init,
3259     MPV_encode_picture,
3260     MPV_encode_end,
3261     .supported_framerates= ff_frame_rate_tab+1,
3262     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3263     .capabilities= CODEC_CAP_DELAY,
3264 };
3265
3266 AVCodec mpeg2video_encoder = {
3267     "mpeg2video",
3268     CODEC_TYPE_VIDEO,
3269     CODEC_ID_MPEG2VIDEO,
3270     sizeof(MpegEncContext),
3271     encode_init,
3272     MPV_encode_picture,
3273     MPV_encode_end,
3274     .supported_framerates= ff_frame_rate_tab+1,
3275     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3276     .capabilities= CODEC_CAP_DELAY,
3277 };
3278 #endif
3279
3280 #ifdef HAVE_XVMC
3281 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3282     Mpeg1Context *s;
3283
3284     if( avctx->thread_count > 1)
3285         return -1;
3286     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3287         return -1;
3288     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3289         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3290     }
3291     mpeg_decode_init(avctx);
3292     s = avctx->priv_data;
3293
3294     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3295     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3296
3297     return 0;
3298 }
3299
3300 AVCodec mpeg_xvmc_decoder = {
3301     "mpegvideo_xvmc",
3302     CODEC_TYPE_VIDEO,
3303     CODEC_ID_MPEG2VIDEO_XVMC,
3304     sizeof(Mpeg1Context),
3305     mpeg_mc_decode_init,
3306     NULL,
3307     mpeg_decode_end,
3308     mpeg_decode_frame,
3309     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3310     .flush= ff_mpeg_flush,
3311 };
3312
3313 #endif
3314
3315 /* this is ugly i know, but the alternative is too make
3316    hundreds of vars global and prefix them with ff_mpeg1_
3317    which is far uglier. */
3318 #include "mdec.c"