Statistics
| Branch: | Revision:

ffmpeg / libavcodec / mpeg12.c @ 31a78b71

History | View | Annotate | Download (112 KB)

1
/*
2
 * MPEG1 codec / MPEG2 decoder
3
 * Copyright (c) 2000,2001 Fabrice Bellard.
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> 
5
 *
6
 * This library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10
 *
11
 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with this library; if not, write to the Free Software
18
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19
 */
20
 
21
/**
22
 * @file mpeg12.c
23
 * MPEG1/2 codec
24
 */
25
 
26
//#define DEBUG
27
#include "avcodec.h"
28
#include "dsputil.h"
29
#include "mpegvideo.h"
30

    
31
#include "mpeg12data.h"
32

    
33
//#undef NDEBUG
34
//#include <assert.h>
35

    
36

    
37
/* Start codes. */
38
#define SEQ_END_CODE                0x000001b7
39
#define SEQ_START_CODE                0x000001b3
40
#define GOP_START_CODE                0x000001b8
41
#define PICTURE_START_CODE        0x00000100
42
#define SLICE_MIN_START_CODE        0x00000101
43
#define SLICE_MAX_START_CODE        0x000001af
44
#define EXT_START_CODE                0x000001b5
45
#define USER_START_CODE                0x000001b2
46

    
47
#define DC_VLC_BITS 9
48
#define MV_VLC_BITS 9
49
#define MBINCR_VLC_BITS 9
50
#define MB_PAT_VLC_BITS 9
51
#define MB_PTYPE_VLC_BITS 6
52
#define MB_BTYPE_VLC_BITS 6
53
#define TEX_VLC_BITS 9
54

    
55
#ifdef CONFIG_ENCODERS
56
static void mpeg1_encode_block(MpegEncContext *s, 
57
                         DCTELEM *block, 
58
                         int component);
59
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
60
#endif //CONFIG_ENCODERS
61
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
62
                              DCTELEM *block, 
63
                              int n);
64
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
65
                              DCTELEM *block, 
66
                              int n);
67
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
68
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
69
                                        DCTELEM *block, 
70
                                        int n);
71
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
72
                                    DCTELEM *block, 
73
                                    int n);
74
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
75
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
76
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
77
static void exchange_uv(MpegEncContext *s);
78

    
79
#ifdef HAVE_XVMC
80
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
81
extern int XVMC_field_end(MpegEncContext *s);
82
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
83
extern void XVMC_init_block(MpegEncContext *s);//set s->block
84
#endif
85

    
86
const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
87
const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
88
const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
89
const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
90
                                           PIX_FMT_XVMC_MPEG2_IDCT,
91
                                           PIX_FMT_XVMC_MPEG2_MC,
92
                                           -1};
93
#ifdef CONFIG_ENCODERS
94
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
95
static uint8_t fcode_tab[MAX_MV*2+1];
96

    
97
static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
98
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
99

    
100
/* simple include everything table for dc, first byte is bits number next 3 are code*/
101
static uint32_t mpeg1_lum_dc_uni[512];
102
static uint32_t mpeg1_chr_dc_uni[512];
103

    
104
static uint8_t mpeg1_index_run[2][64];
105
static int8_t mpeg1_max_level[2][64];
106
#endif //CONFIG_ENCODERS
107

    
108
static void init_2d_vlc_rl(RLTable *rl, int use_static)
109
{
110
    int i;
111
    
112
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
113
             &rl->table_vlc[0][1], 4, 2,
114
             &rl->table_vlc[0][0], 4, 2, use_static);
115

    
116
    if(use_static)    
117
        rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
118
    else
119
        rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120

    
121
    for(i=0; i<rl->vlc.table_size; i++){
122
        int code= rl->vlc.table[i][0];
123
        int len = rl->vlc.table[i][1];
124
        int level, run;
125
    
126
        if(len==0){ // illegal code
127
            run= 65;
128
            level= MAX_LEVEL;
129
        }else if(len<0){ //more bits needed
130
            run= 0;
131
            level= code;
132
        }else{
133
            if(code==rl->n){ //esc
134
                run= 65;
135
                level= 0;
136
            }else if(code==rl->n+1){ //eob
137
                run= 0;
138
                level= 127;
139
            }else{
140
                run=   rl->table_run  [code] + 1;
141
                level= rl->table_level[code];
142
            }
143
        }
144
        rl->rl_vlc[0][i].len= len;
145
        rl->rl_vlc[0][i].level= level;
146
        rl->rl_vlc[0][i].run= run;
147
    }
148
}
149

    
150
#ifdef CONFIG_ENCODERS
151
static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
152
    int i;
153

    
154
    for(i=0; i<128; i++){
155
        int level= i-64;
156
        int run;
157
        for(run=0; run<64; run++){
158
            int len, bits, code;
159
            
160
            int alevel= ABS(level);
161
            int sign= (level>>31)&1;
162

    
163
            if (alevel > rl->max_level[0][run])
164
                code= 111; /*rl->n*/
165
            else
166
                code= rl->index_run[0][run] + alevel - 1;
167

    
168
            if (code < 111 /* rl->n */) {
169
                    /* store the vlc & sign at once */
170
                len=   mpeg1_vlc[code][1]+1;
171
                bits= (mpeg1_vlc[code][0]<<1) + sign;
172
            } else {
173
                len=  mpeg1_vlc[111/*rl->n*/][1]+6;
174
                bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
175

    
176
                bits|= run;
177
                if (alevel < 128) {
178
                    bits<<=8; len+=8;
179
                    bits|= level & 0xff;
180
                } else {
181
                    bits<<=16; len+=16;
182
                    bits|= level & 0xff;
183
                    if (level < 0) {
184
                        bits|= 0x8001 + level + 255;
185
                    } else {
186
                        bits|= level & 0xffff;
187
                    }
188
                }
189
            }
190

    
191
            uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
192
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
193
        }
194
    }
195
}
196

    
197

    
198
static int find_frame_rate_index(MpegEncContext *s){
199
    int i;
200
    int64_t dmin= INT64_MAX;
201
    int64_t d;
202

    
203
    for(i=1;i<14;i++) {
204
        int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->time_base.num;
205
        int64_t n1= 1001LL*s->avctx->time_base.den;
206
        if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
207

    
208
        d = ABS(n0 - n1);
209
        if(d < dmin){
210
            dmin=d;
211
            s->frame_rate_index= i;
212
        }
213
    }
214
    if(dmin)
215
        return -1;
216
    else
217
        return 0;
218
}
219

    
220
static int encode_init(AVCodecContext *avctx)
221
{
222
    MpegEncContext *s = avctx->priv_data;
223

    
224
    if(MPV_encode_init(avctx) < 0)
225
        return -1;
226

    
227
    if(find_frame_rate_index(s) < 0){
228
        if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
229
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
230
            return -1;
231
        }else{
232
            av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
233
        }
234
    }
235
    
236
    return 0;
237
}
238

    
239
static void put_header(MpegEncContext *s, int header)
240
{
241
    align_put_bits(&s->pb);
242
    put_bits(&s->pb, 16, header>>16);
243
    put_bits(&s->pb, 16, header&0xFFFF);
244
}
245

    
246
/* put sequence header if needed */
247
static void mpeg1_encode_sequence_header(MpegEncContext *s)
248
{
249
        unsigned int vbv_buffer_size;
250
        unsigned int fps, v;
251
        int i;
252
        uint64_t time_code;
253
        float best_aspect_error= 1E10;
254
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
255
        int constraint_parameter_flag;
256
        
257
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
258
        
259
        if (s->current_picture.key_frame) {
260
            AVRational framerate= frame_rate_tab[s->frame_rate_index];
261

    
262
            /* mpeg1 header repeated every gop */
263
            put_header(s, SEQ_START_CODE);
264
 
265
            put_bits(&s->pb, 12, s->width);
266
            put_bits(&s->pb, 12, s->height);
267
            
268
            for(i=1; i<15; i++){
269
                float error= aspect_ratio;
270
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
271
                    error-= 1.0/mpeg1_aspect[i];
272
                else
273
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
274
             
275
                error= ABS(error);
276
                
277
                if(error < best_aspect_error){
278
                    best_aspect_error= error;
279
                    s->aspect_ratio_info= i;
280
                }
281
            }
282
            
283
            put_bits(&s->pb, 4, s->aspect_ratio_info);
284
            put_bits(&s->pb, 4, s->frame_rate_index);
285
            
286
            if(s->avctx->rc_max_rate){
287
                v = (s->avctx->rc_max_rate + 399) / 400;
288
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
289
                    v = 0x3ffff;
290
            }else{
291
                v= 0x3FFFF;
292
            }
293

    
294
            if(s->avctx->rc_buffer_size)
295
                vbv_buffer_size = s->avctx->rc_buffer_size;
296
            else
297
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
298
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
299
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
300

    
301
            put_bits(&s->pb, 18, v & 0x3FFFF);
302
            put_bits(&s->pb, 1, 1); /* marker */
303
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
304

    
305
            constraint_parameter_flag= 
306
                s->width <= 768 && s->height <= 576 && 
307
                s->mb_width * s->mb_height <= 396 &&
308
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
309
                framerate.num <= framerate.den*30 &&
310
                s->avctx->me_range && s->avctx->me_range < 128 &&
311
                vbv_buffer_size <= 20 &&
312
                v <= 1856000/400 &&
313
                s->codec_id == CODEC_ID_MPEG1VIDEO;
314
                
315
            put_bits(&s->pb, 1, constraint_parameter_flag);
316
            
317
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
318
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
319

    
320
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
321
                put_header(s, EXT_START_CODE);
322
                put_bits(&s->pb, 4, 1); //seq ext
323
                put_bits(&s->pb, 1, 0); //esc
324
                
325
                if(s->avctx->profile == FF_PROFILE_UNKNOWN){
326
                    put_bits(&s->pb, 3, 4); //profile
327
                }else{
328
                    put_bits(&s->pb, 3, s->avctx->profile); //profile
329
                }
330

    
331
                if(s->avctx->level == FF_LEVEL_UNKNOWN){
332
                    put_bits(&s->pb, 4, 8); //level
333
                }else{
334
                    put_bits(&s->pb, 4, s->avctx->level); //level
335
                }
336

    
337
                put_bits(&s->pb, 1, s->progressive_sequence);
338
                put_bits(&s->pb, 2, 1); //chroma format 4:2:0
339
                put_bits(&s->pb, 2, 0); //horizontal size ext
340
                put_bits(&s->pb, 2, 0); //vertical size ext
341
                put_bits(&s->pb, 12, v>>18); //bitrate ext
342
                put_bits(&s->pb, 1, 1); //marker
343
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
344
                put_bits(&s->pb, 1, s->low_delay);
345
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
346
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
347
            }
348
            
349
            put_header(s, GOP_START_CODE);
350
            put_bits(&s->pb, 1, 0); /* do drop frame */
351
            /* time code : we must convert from the real frame rate to a
352
               fake mpeg frame rate in case of low frame rate */
353
            fps = (framerate.num + framerate.den/2)/ framerate.den;
354
            time_code = s->current_picture_ptr->coded_picture_number;
355

    
356
            s->gop_picture_number = time_code;
357
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
358
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
359
            put_bits(&s->pb, 1, 1);
360
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
361
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
362
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
363
            put_bits(&s->pb, 1, 0); /* broken link */
364
        }
365
}
366

    
367
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
368
    while (run >= 33) {
369
        put_bits(&s->pb, 11, 0x008);
370
        run -= 33;
371
    }
372
    put_bits(&s->pb, mbAddrIncrTable[run][1], 
373
             mbAddrIncrTable[run][0]);
374
}
375
#endif //CONFIG_ENCODERS
376

    
377
static void common_init(MpegEncContext *s)
378
{
379

    
380
    s->y_dc_scale_table=
381
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
382

    
383
}
384

    
385
void ff_mpeg1_clean_buffers(MpegEncContext *s){
386
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
387
    s->last_dc[1] = s->last_dc[0];
388
    s->last_dc[2] = s->last_dc[0];
389
    memset(s->last_mv, 0, sizeof(s->last_mv));
390
}
391

    
392
#ifdef CONFIG_ENCODERS
393

    
394
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
395
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
396
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
397
    put_bits(&s->pb, 1, 0); /* slice extra information */
398
}
399

    
400
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
401
{
402
    mpeg1_encode_sequence_header(s);
403

    
404
    /* mpeg1 picture header */
405
    put_header(s, PICTURE_START_CODE);
406
    /* temporal reference */
407

    
408
    // RAL: s->picture_number instead of s->fake_picture_number
409
    put_bits(&s->pb, 10, (s->picture_number - 
410
                          s->gop_picture_number) & 0x3ff); 
411
    put_bits(&s->pb, 3, s->pict_type);
412

    
413
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
414
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
415
    
416
    // RAL: Forward f_code also needed for B frames
417
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
418
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
419
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
420
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
421
        else
422
            put_bits(&s->pb, 3, 7); /* forward_f_code */
423
    }
424
    
425
    // RAL: Backward f_code necessary for B frames
426
    if (s->pict_type == B_TYPE) {
427
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
428
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
429
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
430
        else
431
            put_bits(&s->pb, 3, 7); /* backward_f_code */
432
    }
433

    
434
    put_bits(&s->pb, 1, 0); /* extra bit picture */
435

    
436
    s->frame_pred_frame_dct = 1;
437
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
438
        put_header(s, EXT_START_CODE);
439
        put_bits(&s->pb, 4, 8); //pic ext
440
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
441
            put_bits(&s->pb, 4, s->f_code);
442
            put_bits(&s->pb, 4, s->f_code);
443
        }else{
444
            put_bits(&s->pb, 8, 255);
445
        }
446
        if (s->pict_type == B_TYPE) {
447
            put_bits(&s->pb, 4, s->b_code);
448
            put_bits(&s->pb, 4, s->b_code);
449
        }else{
450
            put_bits(&s->pb, 8, 255);
451
        }
452
        put_bits(&s->pb, 2, s->intra_dc_precision);
453
        
454
        assert(s->picture_structure == PICT_FRAME);
455
        put_bits(&s->pb, 2, s->picture_structure);
456
        if (s->progressive_sequence) {
457
            put_bits(&s->pb, 1, 0); /* no repeat */
458
        } else {
459
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
460
        }
461
        /* XXX: optimize the generation of this flag with entropy
462
           measures */
463
        s->frame_pred_frame_dct = s->progressive_sequence;
464
        
465
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
466
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
467
        put_bits(&s->pb, 1, s->q_scale_type);
468
        put_bits(&s->pb, 1, s->intra_vlc_format);
469
        put_bits(&s->pb, 1, s->alternate_scan);
470
        put_bits(&s->pb, 1, s->repeat_first_field);
471
        s->progressive_frame = s->progressive_sequence;
472
        put_bits(&s->pb, 1, s->chroma_420_type=s->progressive_frame);
473
        put_bits(&s->pb, 1, s->progressive_frame);
474
        put_bits(&s->pb, 1, 0); //composite_display_flag
475
    }
476
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
477
        int i;
478

    
479
        put_header(s, USER_START_CODE);
480
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
481
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
482
        }
483
    }
484
    
485
    s->mb_y=0;
486
    ff_mpeg1_encode_slice_header(s);
487
}
488

    
489
static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
490
                                int has_mv, int field_motion)
491
{
492
    put_bits(&s->pb, n, bits);
493
    if (!s->frame_pred_frame_dct) {
494
        if (has_mv) 
495
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
496
        put_bits(&s->pb, 1, s->interlaced_dct);
497
    }
498
}
499

    
500
void mpeg1_encode_mb(MpegEncContext *s,
501
                     DCTELEM block[6][64],
502
                     int motion_x, int motion_y)
503
{
504
    int i, cbp;
505
    const int mb_x = s->mb_x;
506
    const int mb_y = s->mb_y;
507
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
508

    
509
    /* compute cbp */
510
    cbp = 0;
511
    for(i=0;i<6;i++) {
512
        if (s->block_last_index[i] >= 0)
513
            cbp |= 1 << (5 - i);
514
    }
515
    
516
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
517
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
518
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
519
        (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
520
        ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
521
        s->mb_skip_run++;
522
        s->qscale -= s->dquant;
523
        s->skip_count++;
524
        s->misc_bits++;
525
        s->last_bits++;
526
        if(s->pict_type == P_TYPE){
527
            s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
528
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
529
        }
530
    } else {
531
        if(first_mb){
532
            assert(s->mb_skip_run == 0);
533
            encode_mb_skip_run(s, s->mb_x);
534
        }else{
535
            encode_mb_skip_run(s, s->mb_skip_run);
536
        }
537
        
538
        if (s->pict_type == I_TYPE) {
539
            if(s->dquant && cbp){
540
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
541
                put_bits(&s->pb, 5, s->qscale);
542
            }else{
543
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
544
                s->qscale -= s->dquant;
545
            }
546
            s->misc_bits+= get_bits_diff(s);
547
            s->i_count++;
548
        } else if (s->mb_intra) {
549
            if(s->dquant && cbp){
550
                put_mb_modes(s, 6, 0x01, 0, 0);
551
                put_bits(&s->pb, 5, s->qscale);
552
            }else{
553
                put_mb_modes(s, 5, 0x03, 0, 0);
554
                s->qscale -= s->dquant;
555
            }
556
            s->misc_bits+= get_bits_diff(s);
557
            s->i_count++;
558
            memset(s->last_mv, 0, sizeof(s->last_mv));
559
        } else if (s->pict_type == P_TYPE) { 
560
            if(s->mv_type == MV_TYPE_16X16){
561
                if (cbp != 0) {
562
                    if ((motion_x|motion_y) == 0) {
563
                        if(s->dquant){
564
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
565
                            put_bits(&s->pb, 5, s->qscale);
566
                        }else{
567
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
568
                        }
569
                        s->misc_bits+= get_bits_diff(s);
570
                    } else {
571
                        if(s->dquant){
572
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
573
                            put_bits(&s->pb, 5, s->qscale);
574
                        }else{
575
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
576
                        }
577
                        s->misc_bits+= get_bits_diff(s);
578
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
579
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
580
                        s->mv_bits+= get_bits_diff(s);
581
                    }
582
                } else {
583
                    put_bits(&s->pb, 3, 1); /* motion only */
584
                    if (!s->frame_pred_frame_dct)
585
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
586
                    s->misc_bits+= get_bits_diff(s);
587
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
588
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
589
                    s->qscale -= s->dquant;
590
                    s->mv_bits+= get_bits_diff(s);
591
                }
592
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
593
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
594
            }else{
595
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
596

    
597
                if (cbp) {
598
                    if(s->dquant){
599
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
600
                        put_bits(&s->pb, 5, s->qscale);
601
                    }else{
602
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
603
                    }
604
                } else {
605
                    put_bits(&s->pb, 3, 1); /* motion only */
606
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
607
                    s->qscale -= s->dquant;
608
                }
609
                s->misc_bits+= get_bits_diff(s);
610
                for(i=0; i<2; i++){
611
                    put_bits(&s->pb, 1, s->field_select[0][i]);
612
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
613
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
614
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
615
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
616
                }
617
                s->mv_bits+= get_bits_diff(s);
618
            }
619
            if(cbp)
620
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
621
            s->f_count++;
622
        } else{  
623
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
624

    
625
            if(s->mv_type == MV_TYPE_16X16){
626
                if (cbp){    // With coded bloc pattern
627
                    if (s->dquant) {
628
                        if(s->mv_dir == MV_DIR_FORWARD)
629
                            put_mb_modes(s, 6, 3, 1, 0);
630
                        else
631
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
632
                        put_bits(&s->pb, 5, s->qscale);
633
                    } else {
634
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
635
                    }
636
                }else{    // No coded bloc pattern
637
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
638
                    if (!s->frame_pred_frame_dct)
639
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
640
                    s->qscale -= s->dquant;
641
                }
642
                s->misc_bits += get_bits_diff(s);
643
                if (s->mv_dir&MV_DIR_FORWARD){
644
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
645
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
646
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
647
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
648
                    s->f_count++;
649
                }
650
                if (s->mv_dir&MV_DIR_BACKWARD){
651
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
652
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
653
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
654
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
655
                    s->b_count++;
656
                }
657
            }else{
658
                assert(s->mv_type == MV_TYPE_FIELD);
659
                assert(!s->frame_pred_frame_dct);
660
                if (cbp){    // With coded bloc pattern
661
                    if (s->dquant) {
662
                        if(s->mv_dir == MV_DIR_FORWARD)
663
                            put_mb_modes(s, 6, 3, 1, 1);
664
                        else
665
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
666
                        put_bits(&s->pb, 5, s->qscale);
667
                    } else {
668
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
669
                    }
670
                }else{    // No coded bloc pattern
671
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
672
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
673
                    s->qscale -= s->dquant;
674
                }
675
                s->misc_bits += get_bits_diff(s);
676
                if (s->mv_dir&MV_DIR_FORWARD){
677
                    for(i=0; i<2; i++){
678
                        put_bits(&s->pb, 1, s->field_select[0][i]);
679
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
680
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
681
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
682
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
683
                    }
684
                    s->f_count++;
685
                }
686
                if (s->mv_dir&MV_DIR_BACKWARD){
687
                    for(i=0; i<2; i++){
688
                        put_bits(&s->pb, 1, s->field_select[1][i]);
689
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
690
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
691
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
692
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
693
                    }
694
                    s->b_count++;
695
                }
696
            }
697
            s->mv_bits += get_bits_diff(s);
698
            if(cbp)
699
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
700
        }
701
        for(i=0;i<6;i++) {
702
            if (cbp & (1 << (5 - i))) {
703
                mpeg1_encode_block(s, block[i], i);
704
            }
705
        }
706
        s->mb_skip_run = 0;
707
        if(s->mb_intra)
708
            s->i_tex_bits+= get_bits_diff(s);
709
        else
710
            s->p_tex_bits+= get_bits_diff(s);
711
    }
712
}
713

    
714
// RAL: Parameter added: f_or_b_code
715
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
716
{
717
    int code, bit_size, l, bits, range, sign;
718

    
719
    if (val == 0) {
720
        /* zero vector */
721
        code = 0;
722
        put_bits(&s->pb,
723
                 mbMotionVectorTable[0][1], 
724
                 mbMotionVectorTable[0][0]); 
725
    } else {
726
        bit_size = f_or_b_code - 1;
727
        range = 1 << bit_size;
728
        /* modulo encoding */
729
        l= INT_BIT - 5 - bit_size;
730
        val= (val<<l)>>l;
731

    
732
        if (val >= 0) {
733
            val--;
734
            code = (val >> bit_size) + 1;
735
            bits = val & (range - 1);
736
            sign = 0;
737
        } else {
738
            val = -val;
739
            val--;
740
            code = (val >> bit_size) + 1;
741
            bits = val & (range - 1);
742
            sign = 1;
743
        }
744

    
745
        assert(code > 0 && code <= 16);
746

    
747
        put_bits(&s->pb,
748
                 mbMotionVectorTable[code][1], 
749
                 mbMotionVectorTable[code][0]); 
750

    
751
        put_bits(&s->pb, 1, sign);
752
        if (bit_size > 0) {
753
            put_bits(&s->pb, bit_size, bits);
754
        }
755
    }
756
}
757

    
758
void ff_mpeg1_encode_init(MpegEncContext *s)
759
{
760
    static int done=0;
761

    
762
    common_init(s);
763

    
764
    if(!done){
765
        int f_code;
766
        int mv;
767
        int i;
768

    
769
        done=1;
770
        init_rl(&rl_mpeg1, 1);
771

    
772
        for(i=0; i<64; i++)
773
        {
774
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
775
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
776
        }
777
        
778
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
779

    
780
        /* build unified dc encoding tables */
781
        for(i=-255; i<256; i++)
782
        {
783
                int adiff, index;
784
                int bits, code;
785
                int diff=i;
786

    
787
                adiff = ABS(diff);
788
                if(diff<0) diff--;
789
                index = av_log2(2*adiff);
790

    
791
                bits= vlc_dc_lum_bits[index] + index;
792
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
793
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
794
                
795
                bits= vlc_dc_chroma_bits[index] + index;
796
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
797
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
798
        }
799

    
800
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
801

    
802
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
803
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
804
                int len;
805

    
806
                if(mv==0) len= mbMotionVectorTable[0][1];
807
                else{
808
                    int val, bit_size, range, code;
809

    
810
                    bit_size = f_code - 1;
811
                    range = 1 << bit_size;
812

    
813
                    val=mv;
814
                    if (val < 0) 
815
                        val = -val;
816
                    val--;
817
                    code = (val >> bit_size) + 1;
818
                    if(code<17){
819
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
820
                    }else{
821
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
822
                    }
823
                }
824

    
825
                mv_penalty[f_code][mv+MAX_MV]= len;
826
            }
827
        }
828
        
829

    
830
        for(f_code=MAX_FCODE; f_code>0; f_code--){
831
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
832
                fcode_tab[mv+MAX_MV]= f_code;
833
            }
834
        }
835
    }
836
    s->me.mv_penalty= mv_penalty;
837
    s->fcode_tab= fcode_tab;
838
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
839
        s->min_qcoeff=-255;
840
        s->max_qcoeff= 255;
841
    }else{
842
        s->min_qcoeff=-2047;
843
        s->max_qcoeff= 2047;
844
    }
845
    s->intra_ac_vlc_length=
846
    s->inter_ac_vlc_length=
847
    s->intra_ac_vlc_last_length=
848
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
849
}
850

    
851
static inline void encode_dc(MpegEncContext *s, int diff, int component)
852
{
853
  if(((unsigned) (diff+255)) >= 511){
854
        int index;
855

    
856
        if(diff<0){
857
            index= av_log2_16bit(-2*diff);
858
            diff--;
859
        }else{
860
            index= av_log2_16bit(2*diff);
861
        }
862
        if (component == 0) {
863
            put_bits(
864
                &s->pb, 
865
                vlc_dc_lum_bits[index] + index,
866
                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
867
        }else{
868
            put_bits(
869
                &s->pb, 
870
                vlc_dc_chroma_bits[index] + index,
871
                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
872
        }
873
  }else{
874
    if (component == 0) {
875
        put_bits(
876
            &s->pb, 
877
            mpeg1_lum_dc_uni[diff+255]&0xFF,
878
            mpeg1_lum_dc_uni[diff+255]>>8);
879
    } else {
880
        put_bits(
881
            &s->pb, 
882
            mpeg1_chr_dc_uni[diff+255]&0xFF,
883
            mpeg1_chr_dc_uni[diff+255]>>8);
884
    }
885
  }
886
}
887

    
888
static void mpeg1_encode_block(MpegEncContext *s, 
889
                               DCTELEM *block, 
890
                               int n)
891
{
892
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
893
    int code, component;
894
//    RLTable *rl = &rl_mpeg1;
895

    
896
    last_index = s->block_last_index[n];
897

    
898
    /* DC coef */
899
    if (s->mb_intra) {
900
        component = (n <= 3 ? 0 : n - 4 + 1);
901
        dc = block[0]; /* overflow is impossible */
902
        diff = dc - s->last_dc[component];
903
        encode_dc(s, diff, component);
904
        s->last_dc[component] = dc;
905
        i = 1;
906
/*
907
        if (s->intra_vlc_format)
908
            rl = &rl_mpeg2;
909
        else
910
            rl = &rl_mpeg1;
911
*/
912
    } else {
913
        /* encode the first coefficient : needs to be done here because
914
           it is handled slightly differently */
915
        level = block[0];
916
        if (abs(level) == 1) {
917
                code = ((uint32_t)level >> 31); /* the sign bit */
918
                put_bits(&s->pb, 2, code | 0x02);
919
                i = 1;
920
        } else {
921
            i = 0;
922
            last_non_zero = -1;
923
            goto next_coef;
924
        }
925
    }
926

    
927
    /* now quantify & encode AC coefs */
928
    last_non_zero = i - 1;
929

    
930
    for(;i<=last_index;i++) {
931
        j = s->intra_scantable.permutated[i];
932
        level = block[j];
933
    next_coef:
934
#if 0
935
        if (level != 0)
936
            dprintf("level[%d]=%d\n", i, level);
937
#endif            
938
        /* encode using VLC */
939
        if (level != 0) {
940
            run = i - last_non_zero - 1;
941
            
942
            alevel= level;
943
            MASK_ABS(sign, alevel)
944
            sign&=1;
945

    
946
//            code = get_rl_index(rl, 0, run, alevel);
947
            if (alevel <= mpeg1_max_level[0][run]){
948
                code= mpeg1_index_run[0][run] + alevel - 1;
949
                    /* store the vlc & sign at once */
950
                put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
951
            } else {
952
                /* escape seems to be pretty rare <5% so i dont optimize it */
953
                put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
954
                /* escape: only clip in this case */
955
                put_bits(&s->pb, 6, run);
956
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
957
                    if (alevel < 128) {
958
                        put_bits(&s->pb, 8, level & 0xff);
959
                    } else {
960
                        if (level < 0) {
961
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
962
                        } else {
963
                            put_bits(&s->pb, 16, level & 0xffff);
964
                        }
965
                    }
966
                }else{
967
                    put_bits(&s->pb, 12, level & 0xfff);
968
                }
969
            }
970
            last_non_zero = i;
971
        }
972
    }
973
    /* end of block */
974
    put_bits(&s->pb, 2, 0x2);
975
}
976
#endif //CONFIG_ENCODERS
977

    
978
/******************************************/
979
/* decoding */
980

    
981
static VLC dc_lum_vlc;
982
static VLC dc_chroma_vlc;
983
static VLC mv_vlc;
984
static VLC mbincr_vlc;
985
static VLC mb_ptype_vlc;
986
static VLC mb_btype_vlc;
987
static VLC mb_pat_vlc;
988

    
989
static void init_vlcs(void)
990
{
991
    static int done = 0;
992

    
993
    if (!done) {
994
        done = 1;
995

    
996
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
997
                 vlc_dc_lum_bits, 1, 1,
998
                 vlc_dc_lum_code, 2, 2, 1);
999
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
1000
                 vlc_dc_chroma_bits, 1, 1,
1001
                 vlc_dc_chroma_code, 2, 2, 1);
1002
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
1003
                 &mbMotionVectorTable[0][1], 2, 1,
1004
                 &mbMotionVectorTable[0][0], 2, 1, 1);
1005
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
1006
                 &mbAddrIncrTable[0][1], 2, 1,
1007
                 &mbAddrIncrTable[0][0], 2, 1, 1);
1008
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1009
                 &mbPatTable[0][1], 2, 1,
1010
                 &mbPatTable[0][0], 2, 1, 1);
1011
        
1012
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
1013
                 &table_mb_ptype[0][1], 2, 1,
1014
                 &table_mb_ptype[0][0], 2, 1, 1);
1015
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
1016
                 &table_mb_btype[0][1], 2, 1,
1017
                 &table_mb_btype[0][0], 2, 1, 1);
1018
        init_rl(&rl_mpeg1, 1);
1019
        init_rl(&rl_mpeg2, 1);
1020

    
1021
        init_2d_vlc_rl(&rl_mpeg1, 1);
1022
        init_2d_vlc_rl(&rl_mpeg2, 1);
1023
    }
1024
}
1025

    
1026
static inline int get_dmv(MpegEncContext *s)
1027
{
1028
    if(get_bits1(&s->gb)) 
1029
        return 1 - (get_bits1(&s->gb) << 1);
1030
    else
1031
        return 0;
1032
}
1033

    
1034
static inline int get_qscale(MpegEncContext *s)
1035
{
1036
    int qscale = get_bits(&s->gb, 5);
1037
    if (s->q_scale_type) {
1038
        return non_linear_qscale[qscale];
1039
    } else {
1040
        return qscale << 1;
1041
    }
1042
}
1043

    
1044
/* motion type (for mpeg2) */
1045
#define MT_FIELD 1
1046
#define MT_FRAME 2
1047
#define MT_16X8  2
1048
#define MT_DMV   3
1049

    
1050
static int mpeg_decode_mb(MpegEncContext *s,
1051
                          DCTELEM block[12][64])
1052
{
1053
    int i, j, k, cbp, val, mb_type, motion_type;
1054
    const int mb_block_count = 4 + (1<< s->chroma_format);
1055

    
1056
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1057

    
1058
    assert(s->mb_skipped==0);
1059

    
1060
    if (s->mb_skip_run-- != 0) {
1061
        if(s->pict_type == I_TYPE){
1062
            av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1063
            return -1;
1064
        }
1065
    
1066
        /* skip mb */
1067
        s->mb_intra = 0;
1068
        for(i=0;i<12;i++)
1069
            s->block_last_index[i] = -1;
1070
        if(s->picture_structure == PICT_FRAME)
1071
            s->mv_type = MV_TYPE_16X16;
1072
        else
1073
            s->mv_type = MV_TYPE_FIELD;
1074
        if (s->pict_type == P_TYPE) {
1075
            /* if P type, zero motion vector is implied */
1076
            s->mv_dir = MV_DIR_FORWARD;
1077
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1078
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1079
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1080
            s->field_select[0][0]= s->picture_structure - 1;
1081
            s->mb_skipped = 1;
1082
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1083
        } else {
1084
            int mb_type;
1085
            
1086
            if(s->mb_x)
1087
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1088
            else
1089
                mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all, 
1090
            if(IS_INTRA(mb_type))
1091
                return -1;
1092
            
1093
            /* if B type, reuse previous vectors and directions */
1094
            s->mv[0][0][0] = s->last_mv[0][0][0];
1095
            s->mv[0][0][1] = s->last_mv[0][0][1];
1096
            s->mv[1][0][0] = s->last_mv[1][0][0];
1097
            s->mv[1][0][1] = s->last_mv[1][0][1];
1098

    
1099
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1100
                mb_type | MB_TYPE_SKIP;
1101
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1102

    
1103
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1104
                s->mb_skipped = 1;
1105
        }
1106

    
1107
        return 0;
1108
    }
1109

    
1110
    switch(s->pict_type) {
1111
    default:
1112
    case I_TYPE:
1113
        if (get_bits1(&s->gb) == 0) {
1114
            if (get_bits1(&s->gb) == 0){
1115
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1116
                return -1;
1117
            }
1118
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1119
        } else {
1120
            mb_type = MB_TYPE_INTRA;
1121
        }
1122
        break;
1123
    case P_TYPE:
1124
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1125
        if (mb_type < 0){
1126
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1127
            return -1;
1128
        }
1129
        mb_type = ptype2mb_type[ mb_type ];
1130
        break;
1131
    case B_TYPE:
1132
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1133
        if (mb_type < 0){
1134
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1135
            return -1;
1136
        }
1137
        mb_type = btype2mb_type[ mb_type ];
1138
        break;
1139
    }
1140
    dprintf("mb_type=%x\n", mb_type);
1141
//    motion_type = 0; /* avoid warning */
1142
    if (IS_INTRA(mb_type)) {
1143
        s->dsp.clear_blocks(s->block[0]);
1144
    
1145
        if(!s->chroma_y_shift){
1146
            s->dsp.clear_blocks(s->block[6]);
1147
        }
1148
    
1149
        /* compute dct type */
1150
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1151
            !s->frame_pred_frame_dct) {
1152
            s->interlaced_dct = get_bits1(&s->gb);
1153
        }
1154

    
1155
        if (IS_QUANT(mb_type))
1156
            s->qscale = get_qscale(s);
1157
        
1158
        if (s->concealment_motion_vectors) {
1159
            /* just parse them */
1160
            if (s->picture_structure != PICT_FRAME) 
1161
                skip_bits1(&s->gb); /* field select */
1162
            
1163
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1164
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1165
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1166
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1167

    
1168
            skip_bits1(&s->gb); /* marker */
1169
        }else
1170
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1171
        s->mb_intra = 1;
1172
#ifdef HAVE_XVMC
1173
        //one 1 we memcpy blocks in xvmcvideo
1174
        if(s->avctx->xvmc_acceleration > 1){
1175
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1176
            if(s->swap_uv){
1177
                exchange_uv(s);
1178
            }
1179
        }
1180
#endif
1181

    
1182
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1183
            if(s->flags2 & CODEC_FLAG2_FAST){
1184
                for(i=0;i<6;i++) {
1185
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1186
                }
1187
            }else{
1188
                for(i=0;i<mb_block_count;i++) {
1189
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1190
                        return -1;
1191
                }
1192
            }
1193
        } else {
1194
            for(i=0;i<6;i++) {
1195
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1196
                    return -1;
1197
            }
1198
        }
1199
    } else {
1200
        if (mb_type & MB_TYPE_ZERO_MV){
1201
            assert(mb_type & MB_TYPE_CBP);
1202

    
1203
            /* compute dct type */
1204
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1205
                !s->frame_pred_frame_dct) {
1206
                s->interlaced_dct = get_bits1(&s->gb);
1207
            }
1208

    
1209
            if (IS_QUANT(mb_type))
1210
                s->qscale = get_qscale(s);
1211

    
1212
            s->mv_dir = MV_DIR_FORWARD;
1213
            if(s->picture_structure == PICT_FRAME)
1214
                s->mv_type = MV_TYPE_16X16;
1215
            else{
1216
                s->mv_type = MV_TYPE_FIELD;
1217
                mb_type |= MB_TYPE_INTERLACED;
1218
                s->field_select[0][0]= s->picture_structure - 1;
1219
            }
1220
            s->last_mv[0][0][0] = 0;
1221
            s->last_mv[0][0][1] = 0;
1222
            s->last_mv[0][1][0] = 0;
1223
            s->last_mv[0][1][1] = 0;
1224
            s->mv[0][0][0] = 0;
1225
            s->mv[0][0][1] = 0;
1226
        }else{
1227
            assert(mb_type & MB_TYPE_L0L1);
1228
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1229
            /* get additionnal motion vector type */
1230
            if (s->frame_pred_frame_dct) 
1231
                motion_type = MT_FRAME;
1232
            else{
1233
                motion_type = get_bits(&s->gb, 2);
1234
            }
1235

    
1236
            /* compute dct type */
1237
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1238
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1239
                s->interlaced_dct = get_bits1(&s->gb);
1240
            }
1241

    
1242
            if (IS_QUANT(mb_type))
1243
                s->qscale = get_qscale(s);
1244

    
1245
            /* motion vectors */
1246
            s->mv_dir = 0;
1247
            for(i=0;i<2;i++) {
1248
                if (USES_LIST(mb_type, i)) {
1249
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1250
                    dprintf("motion_type=%d\n", motion_type);
1251
                    switch(motion_type) {
1252
                    case MT_FRAME: /* or MT_16X8 */
1253
                        if (s->picture_structure == PICT_FRAME) {
1254
                            /* MT_FRAME */
1255
                            mb_type |= MB_TYPE_16x16; 
1256
                            s->mv_type = MV_TYPE_16X16;
1257
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1258
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1259
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1260
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1261
                            /* full_pel: only for mpeg1 */
1262
                            if (s->full_pel[i]){
1263
                                s->mv[i][0][0] <<= 1;
1264
                                s->mv[i][0][1] <<= 1;
1265
                            }
1266
                        } else {
1267
                            /* MT_16X8 */
1268
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1269
                            s->mv_type = MV_TYPE_16X8;
1270
                            for(j=0;j<2;j++) {
1271
                                s->field_select[i][j] = get_bits1(&s->gb);
1272
                                for(k=0;k<2;k++) {
1273
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1274
                                                             s->last_mv[i][j][k]);
1275
                                    s->last_mv[i][j][k] = val;
1276
                                    s->mv[i][j][k] = val;
1277
                                }
1278
                            }
1279
                        }
1280
                        break;
1281
                    case MT_FIELD:
1282
                        s->mv_type = MV_TYPE_FIELD;
1283
                        if (s->picture_structure == PICT_FRAME) {
1284
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1285
                            for(j=0;j<2;j++) {
1286
                                s->field_select[i][j] = get_bits1(&s->gb);
1287
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1288
                                                         s->last_mv[i][j][0]);
1289
                                s->last_mv[i][j][0] = val;
1290
                                s->mv[i][j][0] = val;
1291
                                dprintf("fmx=%d\n", val);
1292
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1293
                                                         s->last_mv[i][j][1] >> 1);
1294
                                s->last_mv[i][j][1] = val << 1;
1295
                                s->mv[i][j][1] = val;
1296
                                dprintf("fmy=%d\n", val);
1297
                            }
1298
                        } else {
1299
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1300
                            s->field_select[i][0] = get_bits1(&s->gb);
1301
                            for(k=0;k<2;k++) {
1302
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1303
                                                         s->last_mv[i][0][k]);
1304
                                s->last_mv[i][0][k] = val;
1305
                                s->last_mv[i][1][k] = val;
1306
                                s->mv[i][0][k] = val;
1307
                            }
1308
                        }
1309
                        break;
1310
                    case MT_DMV:
1311
                        {
1312
                            int dmx, dmy, mx, my, m;
1313

    
1314
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1315
                                                    s->last_mv[i][0][0]);
1316
                            s->last_mv[i][0][0] = mx;
1317
                            s->last_mv[i][1][0] = mx;
1318
                            dmx = get_dmv(s);
1319
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1320
                                                    s->last_mv[i][0][1] >> 1);
1321
                            dmy = get_dmv(s);
1322
                            s->mv_type = MV_TYPE_DMV;
1323

    
1324

    
1325
                            s->last_mv[i][0][1] = my<<1;
1326
                            s->last_mv[i][1][1] = my<<1;
1327

    
1328
                            s->mv[i][0][0] = mx;
1329
                            s->mv[i][0][1] = my;
1330
                            s->mv[i][1][0] = mx;//not used
1331
                            s->mv[i][1][1] = my;//not used
1332

    
1333
                            if (s->picture_structure == PICT_FRAME) {
1334
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1335

    
1336
                                //m = 1 + 2 * s->top_field_first;
1337
                                m = s->top_field_first ? 1 : 3;
1338

    
1339
                                /* top -> top pred */
1340
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1341
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1342
                                m = 4 - m;
1343
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1344
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1345
                            } else {
1346
                                mb_type |= MB_TYPE_16x16;
1347

    
1348
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1349
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1350
                                if(s->picture_structure == PICT_TOP_FIELD)
1351
                                    s->mv[i][2][1]--;
1352
                                else 
1353
                                    s->mv[i][2][1]++;
1354
                            }
1355
                        }
1356
                        break;
1357
                    default:
1358
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1359
                        return -1;
1360
                    }
1361
                }
1362
            }
1363
        }
1364
        
1365
        s->mb_intra = 0;
1366
        if (HAS_CBP(mb_type)) {
1367
            s->dsp.clear_blocks(s->block[0]);
1368
        
1369
            if(!s->chroma_y_shift){
1370
                s->dsp.clear_blocks(s->block[6]);
1371
            }
1372

    
1373
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1374
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1375
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1376
                return -1;
1377
            }
1378
            if(mb_block_count > 6){
1379
                 cbp<<= mb_block_count-6;
1380
                 cbp |= get_bits(&s->gb, mb_block_count-6);
1381
            }
1382

    
1383
#ifdef HAVE_XVMC
1384
            //on 1 we memcpy blocks in xvmcvideo
1385
            if(s->avctx->xvmc_acceleration > 1){
1386
                XVMC_pack_pblocks(s,cbp);
1387
                if(s->swap_uv){
1388
                    exchange_uv(s);
1389
                }
1390
            }    
1391
#endif
1392

    
1393
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1394
                if(s->flags2 & CODEC_FLAG2_FAST){
1395
                    for(i=0;i<6;i++) {
1396
                        if(cbp & 32) {
1397
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1398
                        } else {
1399
                            s->block_last_index[i] = -1;
1400
                        }
1401
                        cbp+=cbp;
1402
                    }
1403
                }else{
1404
                    cbp<<= 12-mb_block_count;
1405
    
1406
                    for(i=0;i<mb_block_count;i++) {
1407
                        if ( cbp & (1<<11) ) {
1408
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1409
                                return -1;
1410
                        } else {
1411
                            s->block_last_index[i] = -1;
1412
                        }
1413
                        cbp+=cbp;
1414
                    }
1415
                }
1416
            } else {
1417
                if(s->flags2 & CODEC_FLAG2_FAST){
1418
                    for(i=0;i<6;i++) {
1419
                        if (cbp & 32) {
1420
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1421
                        } else {
1422
                            s->block_last_index[i] = -1;
1423
                        }
1424
                        cbp+=cbp;
1425
                    }
1426
                }else{
1427
                    for(i=0;i<6;i++) {
1428
                        if (cbp & 32) {
1429
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1430
                                return -1;
1431
                        } else {
1432
                            s->block_last_index[i] = -1;
1433
                        }
1434
                        cbp+=cbp;
1435
                    }
1436
                }
1437
            }
1438
        }else{
1439
            for(i=0;i<12;i++)
1440
                s->block_last_index[i] = -1;
1441
        }
1442
    }
1443

    
1444
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1445

    
1446
    return 0;
1447
}
1448

    
1449
/* as h263, but only 17 codes */
1450
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1451
{
1452
    int code, sign, val, l, shift;
1453

    
1454
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1455
    if (code == 0) {
1456
        return pred;
1457
    }
1458
    if (code < 0) {
1459
        return 0xffff;
1460
    }
1461

    
1462
    sign = get_bits1(&s->gb);
1463
    shift = fcode - 1;
1464
    val = code;
1465
    if (shift) {
1466
        val = (val - 1) << shift;
1467
        val |= get_bits(&s->gb, shift);
1468
        val++;
1469
    }
1470
    if (sign)
1471
        val = -val;
1472
    val += pred;
1473
    
1474
    /* modulo decoding */
1475
    l= INT_BIT - 5 - shift;
1476
    val = (val<<l)>>l;
1477
    return val;
1478
}
1479

    
1480
static inline int decode_dc(GetBitContext *gb, int component)
1481
{
1482
    int code, diff;
1483

    
1484
    if (component == 0) {
1485
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1486
    } else {
1487
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1488
    }
1489
    if (code < 0){
1490
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1491
        return 0xffff;
1492
    }
1493
    if (code == 0) {
1494
        diff = 0;
1495
    } else {
1496
        diff = get_xbits(gb, code);
1497
    }
1498
    return diff;
1499
}
1500

    
1501
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1502
                               DCTELEM *block, 
1503
                               int n)
1504
{
1505
    int level, dc, diff, i, j, run;
1506
    int component;
1507
    RLTable *rl = &rl_mpeg1;
1508
    uint8_t * const scantable= s->intra_scantable.permutated;
1509
    const uint16_t *quant_matrix= s->intra_matrix;
1510
    const int qscale= s->qscale;
1511

    
1512
    /* DC coef */
1513
    component = (n <= 3 ? 0 : n - 4 + 1);
1514
    diff = decode_dc(&s->gb, component);
1515
    if (diff >= 0xffff)
1516
        return -1;
1517
    dc = s->last_dc[component];
1518
    dc += diff;
1519
    s->last_dc[component] = dc;
1520
    block[0] = dc<<3;
1521
    dprintf("dc=%d diff=%d\n", dc, diff);
1522
    i = 0;
1523
    {
1524
        OPEN_READER(re, &s->gb);    
1525
        /* now quantify & encode AC coefs */
1526
        for(;;) {
1527
            UPDATE_CACHE(re, &s->gb);
1528
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1529
            
1530
            if(level == 127){
1531
                break;
1532
            } else if(level != 0) {
1533
                i += run;
1534
                j = scantable[i];
1535
                level= (level*qscale*quant_matrix[j])>>4;
1536
                level= (level-1)|1;
1537
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1538
                LAST_SKIP_BITS(re, &s->gb, 1);
1539
            } else {
1540
                /* escape */
1541
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1542
                UPDATE_CACHE(re, &s->gb);
1543
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1544
                if (level == -128) {
1545
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1546
                } else if (level == 0) {
1547
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1548
                }
1549
                i += run;
1550
                j = scantable[i];
1551
                if(level<0){
1552
                    level= -level;
1553
                    level= (level*qscale*quant_matrix[j])>>4;
1554
                    level= (level-1)|1;
1555
                    level= -level;
1556
                }else{
1557
                    level= (level*qscale*quant_matrix[j])>>4;
1558
                    level= (level-1)|1;
1559
                }
1560
            }
1561
            if (i > 63){
1562
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1563
                return -1;
1564
            }
1565

    
1566
            block[j] = level;
1567
        }
1568
        CLOSE_READER(re, &s->gb);
1569
    }
1570
    s->block_last_index[n] = i;
1571
   return 0;
1572
}
1573

    
1574
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1575
                               DCTELEM *block, 
1576
                               int n)
1577
{
1578
    int level, i, j, run;
1579
    RLTable *rl = &rl_mpeg1;
1580
    uint8_t * const scantable= s->intra_scantable.permutated;
1581
    const uint16_t *quant_matrix= s->inter_matrix;
1582
    const int qscale= s->qscale;
1583

    
1584
    {
1585
        OPEN_READER(re, &s->gb);
1586
        i = -1;
1587
        /* special case for the first coef. no need to add a second vlc table */
1588
        UPDATE_CACHE(re, &s->gb);
1589
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1590
            level= (3*qscale*quant_matrix[0])>>5;
1591
            level= (level-1)|1;
1592
            if(GET_CACHE(re, &s->gb)&0x40000000)
1593
                level= -level;
1594
            block[0] = level;
1595
            i++;
1596
            SKIP_BITS(re, &s->gb, 2);
1597
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1598
                goto end;
1599
        }
1600

    
1601
        /* now quantify & encode AC coefs */
1602
        for(;;) {
1603
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1604
            
1605
            if(level != 0) {
1606
                i += run;
1607
                j = scantable[i];
1608
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1609
                level= (level-1)|1;
1610
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1611
                SKIP_BITS(re, &s->gb, 1);
1612
            } else {
1613
                /* escape */
1614
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1615
                UPDATE_CACHE(re, &s->gb);
1616
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1617
                if (level == -128) {
1618
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1619
                } else if (level == 0) {
1620
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1621
                }
1622
                i += run;
1623
                j = scantable[i];
1624
                if(level<0){
1625
                    level= -level;
1626
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1627
                    level= (level-1)|1;
1628
                    level= -level;
1629
                }else{
1630
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1631
                    level= (level-1)|1;
1632
                }
1633
            }
1634
            if (i > 63){
1635
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1636
                return -1;
1637
            }
1638

    
1639
            block[j] = level;
1640
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1641
                break;
1642
            UPDATE_CACHE(re, &s->gb);
1643
        }
1644
end:
1645
        LAST_SKIP_BITS(re, &s->gb, 2);
1646
        CLOSE_READER(re, &s->gb);
1647
    }
1648
    s->block_last_index[n] = i;
1649
    return 0;
1650
}
1651

    
1652
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1653
{
1654
    int level, i, j, run;
1655
    RLTable *rl = &rl_mpeg1;
1656
    uint8_t * const scantable= s->intra_scantable.permutated;
1657
    const int qscale= s->qscale;
1658

    
1659
    {
1660
        OPEN_READER(re, &s->gb);
1661
        i = -1;
1662
        /* special case for the first coef. no need to add a second vlc table */
1663
        UPDATE_CACHE(re, &s->gb);
1664
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1665
            level= (3*qscale)>>1;
1666
            level= (level-1)|1;
1667
            if(GET_CACHE(re, &s->gb)&0x40000000)
1668
                level= -level;
1669
            block[0] = level;
1670
            i++;
1671
            SKIP_BITS(re, &s->gb, 2);
1672
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1673
                goto end;
1674
        }
1675

    
1676
        /* now quantify & encode AC coefs */
1677
        for(;;) {
1678
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1679
            
1680
            if(level != 0) {
1681
                i += run;
1682
                j = scantable[i];
1683
                level= ((level*2+1)*qscale)>>1;
1684
                level= (level-1)|1;
1685
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1686
                SKIP_BITS(re, &s->gb, 1);
1687
            } else {
1688
                /* escape */
1689
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1690
                UPDATE_CACHE(re, &s->gb);
1691
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1692
                if (level == -128) {
1693
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1694
                } else if (level == 0) {
1695
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1696
                }
1697
                i += run;
1698
                j = scantable[i];
1699
                if(level<0){
1700
                    level= -level;
1701
                    level= ((level*2+1)*qscale)>>1;
1702
                    level= (level-1)|1;
1703
                    level= -level;
1704
                }else{
1705
                    level= ((level*2+1)*qscale)>>1;
1706
                    level= (level-1)|1;
1707
                }
1708
            }
1709

    
1710
            block[j] = level;
1711
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1712
                break;
1713
            UPDATE_CACHE(re, &s->gb);
1714
        }
1715
end:
1716
        LAST_SKIP_BITS(re, &s->gb, 2);
1717
        CLOSE_READER(re, &s->gb);
1718
    }
1719
    s->block_last_index[n] = i;
1720
    return 0;
1721
}
1722

    
1723

    
1724
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1725
                               DCTELEM *block, 
1726
                               int n)
1727
{
1728
    int level, i, j, run;
1729
    RLTable *rl = &rl_mpeg1;
1730
    uint8_t * const scantable= s->intra_scantable.permutated;
1731
    const uint16_t *quant_matrix;
1732
    const int qscale= s->qscale;
1733
    int mismatch;
1734

    
1735
    mismatch = 1;
1736

    
1737
    {
1738
        OPEN_READER(re, &s->gb);
1739
        i = -1;
1740
        if (n < 4)
1741
            quant_matrix = s->inter_matrix;
1742
        else
1743
            quant_matrix = s->chroma_inter_matrix;
1744

    
1745
        /* special case for the first coef. no need to add a second vlc table */
1746
        UPDATE_CACHE(re, &s->gb);
1747
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1748
            level= (3*qscale*quant_matrix[0])>>5;
1749
            if(GET_CACHE(re, &s->gb)&0x40000000)
1750
                level= -level;
1751
            block[0] = level;
1752
            mismatch ^= level;
1753
            i++;
1754
            SKIP_BITS(re, &s->gb, 2);
1755
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1756
                goto end;
1757
        }
1758

    
1759
        /* now quantify & encode AC coefs */
1760
        for(;;) {
1761
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1762
            
1763
            if(level != 0) {
1764
                i += run;
1765
                j = scantable[i];
1766
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1767
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1768
                SKIP_BITS(re, &s->gb, 1);
1769
            } else {
1770
                /* escape */
1771
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1772
                UPDATE_CACHE(re, &s->gb);
1773
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1774

    
1775
                i += run;
1776
                j = scantable[i];
1777
                if(level<0){
1778
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1779
                    level= -level;
1780
                }else{
1781
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1782
                }
1783
            }
1784
            if (i > 63){
1785
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1786
                return -1;
1787
            }
1788
            
1789
            mismatch ^= level;
1790
            block[j] = level;
1791
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1792
                break;
1793
            UPDATE_CACHE(re, &s->gb);
1794
        }
1795
end:
1796
        LAST_SKIP_BITS(re, &s->gb, 2);
1797
        CLOSE_READER(re, &s->gb);
1798
    }
1799
    block[63] ^= (mismatch & 1);
1800
    
1801
    s->block_last_index[n] = i;
1802
    return 0;
1803
}
1804

    
1805
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, 
1806
                               DCTELEM *block, 
1807
                               int n)
1808
{
1809
    int level, i, j, run;
1810
    RLTable *rl = &rl_mpeg1;
1811
    uint8_t * const scantable= s->intra_scantable.permutated;
1812
    const int qscale= s->qscale;
1813
    OPEN_READER(re, &s->gb);
1814
    i = -1;
1815

    
1816
    /* special case for the first coef. no need to add a second vlc table */
1817
    UPDATE_CACHE(re, &s->gb);
1818
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1819
        level= (3*qscale)>>1;
1820
        if(GET_CACHE(re, &s->gb)&0x40000000)
1821
            level= -level;
1822
        block[0] = level;
1823
        i++;
1824
        SKIP_BITS(re, &s->gb, 2);
1825
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1826
            goto end;
1827
    }
1828

    
1829
    /* now quantify & encode AC coefs */
1830
    for(;;) {
1831
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1832
        
1833
        if(level != 0) {
1834
            i += run;
1835
            j = scantable[i];
1836
            level= ((level*2+1)*qscale)>>1;
1837
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1838
            SKIP_BITS(re, &s->gb, 1);
1839
        } else {
1840
            /* escape */
1841
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1842
            UPDATE_CACHE(re, &s->gb);
1843
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1844

    
1845
            i += run;
1846
            j = scantable[i];
1847
            if(level<0){
1848
                level= ((-level*2+1)*qscale)>>1;
1849
                level= -level;
1850
            }else{
1851
                level= ((level*2+1)*qscale)>>1;
1852
            }
1853
        }
1854
        
1855
        block[j] = level;
1856
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1857
            break;
1858
        UPDATE_CACHE(re, &s->gb);
1859
    }
1860
end:
1861
    LAST_SKIP_BITS(re, &s->gb, 2);    
1862
    CLOSE_READER(re, &s->gb);
1863
    s->block_last_index[n] = i;
1864
    return 0;
1865
}
1866

    
1867

    
1868
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1869
                               DCTELEM *block, 
1870
                               int n)
1871
{
1872
    int level, dc, diff, i, j, run;
1873
    int component;
1874
    RLTable *rl;
1875
    uint8_t * const scantable= s->intra_scantable.permutated;
1876
    const uint16_t *quant_matrix;
1877
    const int qscale= s->qscale;
1878
    int mismatch;
1879

    
1880
    /* DC coef */
1881
    if (n < 4){
1882
        quant_matrix = s->intra_matrix;
1883
        component = 0; 
1884
    }else{
1885
        quant_matrix = s->chroma_intra_matrix;
1886
        component = (n&1) + 1;
1887
    }
1888
    diff = decode_dc(&s->gb, component);
1889
    if (diff >= 0xffff)
1890
        return -1;
1891
    dc = s->last_dc[component];
1892
    dc += diff;
1893
    s->last_dc[component] = dc;
1894
    block[0] = dc << (3 - s->intra_dc_precision);
1895
    dprintf("dc=%d\n", block[0]);
1896
    mismatch = block[0] ^ 1;
1897
    i = 0;
1898
    if (s->intra_vlc_format)
1899
        rl = &rl_mpeg2;
1900
    else
1901
        rl = &rl_mpeg1;
1902

    
1903
    {
1904
        OPEN_READER(re, &s->gb);    
1905
        /* now quantify & encode AC coefs */
1906
        for(;;) {
1907
            UPDATE_CACHE(re, &s->gb);
1908
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1909
            
1910
            if(level == 127){
1911
                break;
1912
            } else if(level != 0) {
1913
                i += run;
1914
                j = scantable[i];
1915
                level= (level*qscale*quant_matrix[j])>>4;
1916
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1917
                LAST_SKIP_BITS(re, &s->gb, 1);
1918
            } else {
1919
                /* escape */
1920
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1921
                UPDATE_CACHE(re, &s->gb);
1922
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1923
                i += run;
1924
                j = scantable[i];
1925
                if(level<0){
1926
                    level= (-level*qscale*quant_matrix[j])>>4;
1927
                    level= -level;
1928
                }else{
1929
                    level= (level*qscale*quant_matrix[j])>>4;
1930
                }
1931
            }
1932
            if (i > 63){
1933
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1934
                return -1;
1935
            }
1936
            
1937
            mismatch^= level;
1938
            block[j] = level;
1939
        }
1940
        CLOSE_READER(re, &s->gb);
1941
    }
1942
    block[63]^= mismatch&1;
1943
    
1944
    s->block_last_index[n] = i;
1945
    return 0;
1946
}
1947

    
1948
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, 
1949
                               DCTELEM *block, 
1950
                               int n)
1951
{
1952
    int level, dc, diff, j, run;
1953
    int component;
1954
    RLTable *rl;
1955
    uint8_t * scantable= s->intra_scantable.permutated;
1956
    const uint16_t *quant_matrix;
1957
    const int qscale= s->qscale;
1958

    
1959
    /* DC coef */
1960
    if (n < 4){
1961
        quant_matrix = s->intra_matrix;
1962
        component = 0; 
1963
    }else{
1964
        quant_matrix = s->chroma_intra_matrix;
1965
        component = (n&1) + 1;
1966
    }
1967
    diff = decode_dc(&s->gb, component);
1968
    if (diff >= 0xffff)
1969
        return -1;
1970
    dc = s->last_dc[component];
1971
    dc += diff;
1972
    s->last_dc[component] = dc;
1973
    block[0] = dc << (3 - s->intra_dc_precision);
1974
    if (s->intra_vlc_format)
1975
        rl = &rl_mpeg2;
1976
    else
1977
        rl = &rl_mpeg1;
1978

    
1979
    {
1980
        OPEN_READER(re, &s->gb);    
1981
        /* now quantify & encode AC coefs */
1982
        for(;;) {
1983
            UPDATE_CACHE(re, &s->gb);
1984
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1985
            
1986
            if(level == 127){
1987
                break;
1988
            } else if(level != 0) {
1989
                scantable += run;
1990
                j = *scantable;
1991
                level= (level*qscale*quant_matrix[j])>>4;
1992
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1993
                LAST_SKIP_BITS(re, &s->gb, 1);
1994
            } else {
1995
                /* escape */
1996
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1997
                UPDATE_CACHE(re, &s->gb);
1998
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1999
                scantable += run;
2000
                j = *scantable;
2001
                if(level<0){
2002
                    level= (-level*qscale*quant_matrix[j])>>4;
2003
                    level= -level;
2004
                }else{
2005
                    level= (level*qscale*quant_matrix[j])>>4;
2006
                }
2007
            }
2008
            
2009
            block[j] = level;
2010
        }
2011
        CLOSE_READER(re, &s->gb);
2012
    }
2013
    
2014
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2015
    return 0;
2016
}
2017

    
2018
typedef struct Mpeg1Context {
2019
    MpegEncContext mpeg_enc_ctx;
2020
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2021
    int repeat_field; /* true if we must repeat the field */
2022
    AVPanScan pan_scan; /** some temporary storage for the panscan */
2023
    int slice_count;
2024
    int swap_uv;//indicate VCR2
2025
    int save_aspect_info;
2026
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2027

    
2028
} Mpeg1Context;
2029

    
2030
static int mpeg_decode_init(AVCodecContext *avctx)
2031
{
2032
    Mpeg1Context *s = avctx->priv_data;
2033
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2034
    int i;
2035
    
2036
    //we need some parmutation to store
2037
    //matrixes, until MPV_common_init()
2038
    //set the real permutatuon 
2039
    for(i=0;i<64;i++)
2040
       s2->dsp.idct_permutation[i]=i;
2041

    
2042
    MPV_decode_defaults(s2);
2043
    
2044
    s->mpeg_enc_ctx.avctx= avctx;
2045
    s->mpeg_enc_ctx.flags= avctx->flags;
2046
    s->mpeg_enc_ctx.flags2= avctx->flags2;
2047
    common_init(&s->mpeg_enc_ctx);
2048
    init_vlcs();
2049

    
2050
    s->mpeg_enc_ctx_allocated = 0;
2051
    s->mpeg_enc_ctx.picture_number = 0;
2052
    s->repeat_field = 0;
2053
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2054
    return 0;
2055
}
2056

    
2057
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, 
2058
                                     const uint8_t *new_perm){
2059
    uint16_t temp_matrix[64];
2060
    int i;
2061

    
2062
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2063
    
2064
    for(i=0;i<64;i++){
2065
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2066
    }      
2067
}
2068

    
2069
//Call this function when we know all parameters
2070
//it may be called in different places for mpeg1 and mpeg2
2071
static int mpeg_decode_postinit(AVCodecContext *avctx){
2072
    Mpeg1Context *s1 = avctx->priv_data;
2073
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2074
    uint8_t old_permutation[64];
2075

    
2076
    if (
2077
            (s1->mpeg_enc_ctx_allocated == 0)|| 
2078
        avctx->coded_width  != s->width ||
2079
        avctx->coded_height != s->height||
2080
        s1->save_aspect_info != s->aspect_ratio_info||
2081
        0)
2082
    {
2083
    
2084
        if (s1->mpeg_enc_ctx_allocated) {
2085
            ParseContext pc= s->parse_context;
2086
            s->parse_context.buffer=0;
2087
            MPV_common_end(s);
2088
            s->parse_context= pc;
2089
        }
2090

    
2091
        if( (s->width == 0 )||(s->height == 0))
2092
            return -2;
2093

    
2094
        avcodec_set_dimensions(avctx, s->width, s->height);
2095
        avctx->bit_rate = s->bit_rate;
2096
        s1->save_aspect_info = s->aspect_ratio_info;
2097

    
2098
     //low_delay may be forced, in this case we will have B frames
2099
     //that behave like P frames
2100
        avctx->has_b_frames = !(s->low_delay);
2101

    
2102
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2103
            //mpeg1 fps
2104
            avctx->time_base.den     = frame_rate_tab[s->frame_rate_index].num;
2105
            avctx->time_base.num= frame_rate_tab[s->frame_rate_index].den;
2106
            //mpeg1 aspect
2107
            avctx->sample_aspect_ratio= av_d2q(
2108
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2109

    
2110
        }else{//mpeg2
2111
        //mpeg2 fps
2112
            av_reduce(
2113
                &s->avctx->time_base.den, 
2114
                &s->avctx->time_base.num, 
2115
                frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2116
                frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2117
                1<<30);
2118
        //mpeg2 aspect
2119
            if(s->aspect_ratio_info > 1){
2120
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2121
                    s->avctx->sample_aspect_ratio= 
2122
                        av_div_q(
2123
                         mpeg2_aspect[s->aspect_ratio_info], 
2124
                         (AVRational){s->width, s->height}
2125
                         );
2126
                }else{
2127
                    s->avctx->sample_aspect_ratio= 
2128
                        av_div_q(
2129
                         mpeg2_aspect[s->aspect_ratio_info], 
2130
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2131
                        );
2132
                }
2133
            }else{
2134
                s->avctx->sample_aspect_ratio= 
2135
                    mpeg2_aspect[s->aspect_ratio_info];
2136
            }
2137
        }//mpeg2
2138

    
2139
        if(avctx->xvmc_acceleration){
2140
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2141
        }else{
2142
            if(s->chroma_format <  2){
2143
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2144
            }else
2145
            if(s->chroma_format == 2){
2146
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2147
            }else
2148
            if(s->chroma_format >  2){
2149
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2150
            }
2151
        }
2152
        //until then pix_fmt may be changed right after codec init
2153
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2154
            if( avctx->idct_algo == FF_IDCT_AUTO )
2155
                avctx->idct_algo = FF_IDCT_SIMPLE;
2156

    
2157
        //quantization matrixes may need reordering 
2158
        //if dct permutation is changed
2159
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2160

    
2161
        if (MPV_common_init(s) < 0)
2162
            return -2;
2163

    
2164
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2165
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2166
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2167
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2168

    
2169
        s1->mpeg_enc_ctx_allocated = 1;
2170
    }
2171
    return 0;
2172
}
2173

    
2174
/* return the 8 bit start code value and update the search
2175
   state. Return -1 if no start code found */
2176
static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
2177
{
2178
    const uint8_t *buf_ptr= *pbuf_ptr;
2179

    
2180
    buf_ptr++; //gurantees that -1 is within the array
2181
    buf_end -= 2; // gurantees that +2 is within the array
2182

    
2183
    while (buf_ptr < buf_end) {
2184
        if(*buf_ptr==0){
2185
            while(buf_ptr < buf_end && buf_ptr[1]==0)
2186
                buf_ptr++;
2187

    
2188
            if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
2189
                *pbuf_ptr = buf_ptr+3;
2190
                return buf_ptr[2] + 0x100;
2191
            }
2192
        }
2193
        buf_ptr += 2;
2194
    }
2195
    buf_end += 2; //undo the hack above
2196
    
2197
    *pbuf_ptr = buf_end;
2198
    return -1;
2199
}
2200

    
2201
static int mpeg1_decode_picture(AVCodecContext *avctx, 
2202
                                const uint8_t *buf, int buf_size)
2203
{
2204
    Mpeg1Context *s1 = avctx->priv_data;
2205
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2206
    int ref, f_code, vbv_delay;
2207

    
2208
    if(mpeg_decode_postinit(s->avctx) < 0) 
2209
       return -2;
2210

    
2211
    init_get_bits(&s->gb, buf, buf_size*8);
2212

    
2213
    ref = get_bits(&s->gb, 10); /* temporal ref */
2214
    s->pict_type = get_bits(&s->gb, 3);
2215
    if(s->pict_type == 0 || s->pict_type > 3)
2216
        return -1;
2217

    
2218
    vbv_delay= get_bits(&s->gb, 16);
2219
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2220
        s->full_pel[0] = get_bits1(&s->gb);
2221
        f_code = get_bits(&s->gb, 3);
2222
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2223
            return -1;
2224
        s->mpeg_f_code[0][0] = f_code;
2225
        s->mpeg_f_code[0][1] = f_code;
2226
    }
2227
    if (s->pict_type == B_TYPE) {
2228
        s->full_pel[1] = get_bits1(&s->gb);
2229
        f_code = get_bits(&s->gb, 3);
2230
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2231
            return -1;
2232
        s->mpeg_f_code[1][0] = f_code;
2233
        s->mpeg_f_code[1][1] = f_code;
2234
    }
2235
    s->current_picture.pict_type= s->pict_type;
2236
    s->current_picture.key_frame= s->pict_type == I_TYPE;
2237
    
2238
    if(avctx->debug & FF_DEBUG_PICT_INFO)
2239
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2240
    
2241
    s->y_dc_scale = 8;
2242
    s->c_dc_scale = 8;
2243
    s->first_slice = 1;
2244
    return 0;
2245
}
2246

    
2247
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2248
{
2249
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2250
    int horiz_size_ext, vert_size_ext;
2251
    int bit_rate_ext;
2252

    
2253
    skip_bits(&s->gb, 1); /* profil and level esc*/
2254
    s->avctx->profile= get_bits(&s->gb, 3);
2255
    s->avctx->level= get_bits(&s->gb, 4);
2256
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2257
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2258
    horiz_size_ext = get_bits(&s->gb, 2);
2259
    vert_size_ext = get_bits(&s->gb, 2);
2260
    s->width |= (horiz_size_ext << 12);
2261
    s->height |= (vert_size_ext << 12);
2262
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2263
    s->bit_rate += (bit_rate_ext << 18) * 400;
2264
    skip_bits1(&s->gb); /* marker */
2265
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2266

    
2267
    s->low_delay = get_bits1(&s->gb);
2268
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2269

    
2270
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2271
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2272

    
2273
    dprintf("sequence extension\n");
2274
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2275
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
2276

    
2277
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2278
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
2279
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2280

    
2281
}
2282

    
2283
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2284
{
2285
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2286
    int color_description, w, h;
2287

    
2288
    skip_bits(&s->gb, 3); /* video format */
2289
    color_description= get_bits1(&s->gb);
2290
    if(color_description){
2291
        skip_bits(&s->gb, 8); /* color primaries */
2292
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2293
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2294
    }
2295
    w= get_bits(&s->gb, 14);
2296
    skip_bits(&s->gb, 1); //marker
2297
    h= get_bits(&s->gb, 14);
2298
    skip_bits(&s->gb, 1); //marker
2299
    
2300
    s1->pan_scan.width= 16*w;
2301
    s1->pan_scan.height=16*h;
2302
        
2303
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2304
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2305
}
2306

    
2307
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2308
{
2309
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2310
    int i,nofco;
2311

    
2312
    nofco = 1;
2313
    if(s->progressive_sequence){
2314
        if(s->repeat_first_field){
2315
            nofco++;
2316
            if(s->top_field_first)
2317
                nofco++;        
2318
        }
2319
    }else{
2320
        if(s->picture_structure == PICT_FRAME){
2321
            nofco++;
2322
            if(s->repeat_first_field)
2323
                nofco++;
2324
        }
2325
    }
2326
    for(i=0; i<nofco; i++){
2327
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2328
        skip_bits(&s->gb, 1); //marker
2329
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2330
        skip_bits(&s->gb, 1); //marker
2331
    }
2332
   
2333
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2334
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
2335
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
2336
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
2337
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2338
        );
2339
}
2340

    
2341
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2342
{
2343
    int i, v, j;
2344

    
2345
    dprintf("matrix extension\n");
2346

    
2347
    if (get_bits1(&s->gb)) {
2348
        for(i=0;i<64;i++) {
2349
            v = get_bits(&s->gb, 8);
2350
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2351
            s->intra_matrix[j] = v;
2352
            s->chroma_intra_matrix[j] = v;
2353
        }
2354
    }
2355
    if (get_bits1(&s->gb)) {
2356
        for(i=0;i<64;i++) {
2357
            v = get_bits(&s->gb, 8);
2358
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2359
            s->inter_matrix[j] = v;
2360
            s->chroma_inter_matrix[j] = v;
2361
        }
2362
    }
2363
    if (get_bits1(&s->gb)) {
2364
        for(i=0;i<64;i++) {
2365
            v = get_bits(&s->gb, 8);
2366
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2367
            s->chroma_intra_matrix[j] = v;
2368
        }
2369
    }
2370
    if (get_bits1(&s->gb)) {
2371
        for(i=0;i<64;i++) {
2372
            v = get_bits(&s->gb, 8);
2373
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2374
            s->chroma_inter_matrix[j] = v;
2375
        }
2376
    }
2377
}
2378

    
2379
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2380
{
2381
    s->full_pel[0] = s->full_pel[1] = 0;
2382
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2383
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2384
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2385
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2386
    s->intra_dc_precision = get_bits(&s->gb, 2);
2387
    s->picture_structure = get_bits(&s->gb, 2);
2388
    s->top_field_first = get_bits1(&s->gb);
2389
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2390
    s->concealment_motion_vectors = get_bits1(&s->gb);
2391
    s->q_scale_type = get_bits1(&s->gb);
2392
    s->intra_vlc_format = get_bits1(&s->gb);
2393
    s->alternate_scan = get_bits1(&s->gb);
2394
    s->repeat_first_field = get_bits1(&s->gb);
2395
    s->chroma_420_type = get_bits1(&s->gb);
2396
    s->progressive_frame = get_bits1(&s->gb);
2397

    
2398
    if(s->picture_structure == PICT_FRAME)
2399
        s->first_field=0;
2400
    else{
2401
        s->first_field ^= 1;
2402
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2403
    }
2404
    
2405
    if(s->alternate_scan){
2406
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2407
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2408
    }else{
2409
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2410
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2411
    }
2412
    
2413
    /* composite display not parsed */
2414
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2415
    dprintf("picture_structure=%d\n", s->picture_structure);
2416
    dprintf("top field first=%d\n", s->top_field_first);
2417
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2418
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2419
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2420
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2421
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2422
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2423
}
2424

    
2425
static void mpeg_decode_extension(AVCodecContext *avctx, 
2426
                                  const uint8_t *buf, int buf_size)
2427
{
2428
    Mpeg1Context *s1 = avctx->priv_data;
2429
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2430
    int ext_type;
2431

    
2432
    init_get_bits(&s->gb, buf, buf_size*8);
2433
    
2434
    ext_type = get_bits(&s->gb, 4);
2435
    switch(ext_type) {
2436
    case 0x1:
2437
        mpeg_decode_sequence_extension(s1);
2438
        break;
2439
    case 0x2:
2440
        mpeg_decode_sequence_display_extension(s1);
2441
        break;
2442
    case 0x3:
2443
        mpeg_decode_quant_matrix_extension(s);
2444
        break;
2445
    case 0x7:
2446
        mpeg_decode_picture_display_extension(s1);
2447
        break;
2448
    case 0x8:
2449
        mpeg_decode_picture_coding_extension(s);
2450
        break;
2451
    }
2452
}
2453

    
2454
static void exchange_uv(MpegEncContext *s){
2455
    short * tmp = s->pblocks[4];
2456
    s->pblocks[4] = s->pblocks[5];
2457
    s->pblocks[5] = tmp;
2458
}
2459

    
2460
static int mpeg_field_start(MpegEncContext *s){
2461
    AVCodecContext *avctx= s->avctx;
2462
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2463

    
2464
    /* start frame decoding */
2465
    if(s->first_field || s->picture_structure==PICT_FRAME){
2466
        if(MPV_frame_start(s, avctx) < 0)
2467
            return -1;
2468

    
2469
        ff_er_frame_start(s);
2470

    
2471
        /* first check if we must repeat the frame */
2472
        s->current_picture_ptr->repeat_pict = 0;
2473
        if (s->repeat_first_field) {
2474
            if (s->progressive_sequence) {
2475
                if (s->top_field_first)
2476
                    s->current_picture_ptr->repeat_pict = 4;
2477
                else
2478
                    s->current_picture_ptr->repeat_pict = 2;
2479
            } else if (s->progressive_frame) {
2480
                s->current_picture_ptr->repeat_pict = 1;
2481
            }
2482
        }         
2483

    
2484
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2485
    }else{ //second field
2486
            int i;
2487
            
2488
            if(!s->current_picture_ptr){
2489
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2490
                return -1;
2491
            }
2492
            
2493
            for(i=0; i<4; i++){
2494
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2495
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2496
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2497
                } 
2498
            }
2499
    }
2500
#ifdef HAVE_XVMC
2501
// MPV_frame_start will call this function too,
2502
// but we need to call it on every field
2503
    if(s->avctx->xvmc_acceleration)
2504
         XVMC_field_start(s,avctx);
2505
#endif
2506

    
2507
    return 0;
2508
}
2509

    
2510
#define DECODE_SLICE_ERROR -1
2511
#define DECODE_SLICE_OK 0
2512

    
2513
/**
2514
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2515
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2516
 *         DECODE_SLICE_OK if this slice is ok<br>
2517
 */
2518
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2519
                             const uint8_t **buf, int buf_size)
2520
{
2521
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2522
    AVCodecContext *avctx= s->avctx;
2523
    int ret;
2524
    const int field_pic= s->picture_structure != PICT_FRAME;
2525
    const int lowres= s->avctx->lowres;
2526

    
2527
    s->resync_mb_x=
2528
    s->resync_mb_y= -1;
2529

    
2530
    if (mb_y<<field_pic >= s->mb_height){
2531
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2532
        return -1;
2533
    }
2534
    
2535
    init_get_bits(&s->gb, *buf, buf_size*8);
2536

    
2537
    ff_mpeg1_clean_buffers(s);
2538
    s->interlaced_dct = 0;
2539

    
2540
    s->qscale = get_qscale(s);
2541

    
2542
    if(s->qscale == 0){
2543
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2544
        return -1;
2545
    }
2546
    
2547
    /* extra slice info */
2548
    while (get_bits1(&s->gb) != 0) {
2549
        skip_bits(&s->gb, 8);
2550
    }
2551
    
2552
    s->mb_x=0;
2553

    
2554
    for(;;) {
2555
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2556
        if (code < 0){
2557
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2558
            return -1;
2559
        }
2560
        if (code >= 33) {
2561
            if (code == 33) {
2562
                s->mb_x += 33;
2563
            }
2564
            /* otherwise, stuffing, nothing to do */
2565
        } else {
2566
            s->mb_x += code;
2567
            break;
2568
        }
2569
    }
2570

    
2571
    s->resync_mb_x= s->mb_x;
2572
    s->resync_mb_y= s->mb_y= mb_y;
2573
    s->mb_skip_run= 0;
2574
    ff_init_block_index(s);
2575

    
2576
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2577
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2578
             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", 
2579
                 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],
2580
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2581
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2582
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2583
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2584
        }
2585
    }    
2586
    
2587
    for(;;) {
2588
#ifdef HAVE_XVMC
2589
        //one 1 we memcpy blocks in xvmcvideo
2590
        if(s->avctx->xvmc_acceleration > 1)
2591
            XVMC_init_block(s);//set s->block
2592
#endif
2593

    
2594
        ret = mpeg_decode_mb(s, s->block);
2595
        s->chroma_qscale= s->qscale;
2596

    
2597
        dprintf("ret=%d\n", ret);
2598
        if (ret < 0)
2599
            return -1;
2600

    
2601
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2602
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2603
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2604
            int motion_x, motion_y, dir, i;
2605
            if(field_pic && !s->first_field)
2606
                xy += wrap/2;
2607

    
2608
            for(i=0; i<2; i++){
2609
                for(dir=0; dir<2; dir++){
2610
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2611
                        motion_x = motion_y = 0;
2612
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2613
                        motion_x = s->mv[dir][0][0];
2614
                        motion_y = s->mv[dir][0][1];
2615
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2616
                        motion_x = s->mv[dir][i][0];
2617
                        motion_y = s->mv[dir][i][1];
2618
                    }
2619

    
2620
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2621
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2622
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2623
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2624
                    s->current_picture.ref_index [dir][xy    ]=
2625
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2626
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2627
                }
2628
                xy += wrap;
2629
            }
2630
        }
2631

    
2632
        s->dest[0] += 16 >> lowres;
2633
        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2634
        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2635

    
2636
        MPV_decode_mb(s, s->block);
2637
        
2638
        if (++s->mb_x >= s->mb_width) {
2639
            const int mb_size= 16>>s->avctx->lowres;
2640

    
2641
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2642

    
2643
            s->mb_x = 0;
2644
            s->mb_y++;
2645

    
2646
            if(s->mb_y<<field_pic >= s->mb_height){
2647
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2648

    
2649
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2650
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2651
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
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
        int start_code, ret;
2703

    
2704
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2705
        emms_c();
2706
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2707
//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);
2708
        if(ret < 0){
2709
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2710
                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);
2711
        }else{
2712
            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);
2713
        }
2714
        
2715
        if(s->mb_y == s->end_mb_y)
2716
            return 0;
2717
        
2718
        start_code = find_start_code(&buf, s->gb.buffer_end);
2719
        mb_y= start_code - SLICE_MIN_START_CODE;
2720
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2721
            return -1;
2722
    }
2723
    
2724
    return 0; //not reached
2725
}
2726

    
2727
/**
2728
 * handles slice ends.
2729
 * @return 1 if it seems to be the last slice of 
2730
 */
2731
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2732
{
2733
    Mpeg1Context *s1 = avctx->priv_data;
2734
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2735
       
2736
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2737
        return 0;
2738

    
2739
#ifdef HAVE_XVMC
2740
    if(s->avctx->xvmc_acceleration)
2741
        XVMC_field_end(s);
2742
#endif
2743
    /* end of slice reached */
2744
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2745
        /* end of image */
2746

    
2747
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2748

    
2749
        ff_er_frame_end(s);
2750

    
2751
        MPV_frame_end(s);
2752

    
2753
        if (s->pict_type == B_TYPE || s->low_delay) {
2754
            *pict= *(AVFrame*)s->current_picture_ptr;
2755
            ff_print_debug_info(s, pict);
2756
        } else {
2757
            s->picture_number++;
2758
            /* latency of 1 frame for I and P frames */
2759
            /* XXX: use another variable than picture_number */
2760
            if (s->last_picture_ptr != NULL) {
2761
                *pict= *(AVFrame*)s->last_picture_ptr;
2762
                 ff_print_debug_info(s, pict);
2763
            }
2764
        }
2765

    
2766
        return 1;
2767
    } else {
2768
        return 0;
2769
    }
2770
}
2771

    
2772
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2773
                                 const uint8_t *buf, int buf_size)
2774
{
2775
    Mpeg1Context *s1 = avctx->priv_data;
2776
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2777
    int width,height;
2778
    int i, v, j;
2779

    
2780
    init_get_bits(&s->gb, buf, buf_size*8);
2781

    
2782
    width = get_bits(&s->gb, 12);
2783
    height = get_bits(&s->gb, 12);
2784
    if (width <= 0 || height <= 0 ||
2785
        (width % 2) != 0 || (height % 2) != 0)
2786
        return -1;
2787
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2788
    if (s->aspect_ratio_info == 0)
2789
        return -1;
2790
    s->frame_rate_index = get_bits(&s->gb, 4);
2791
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2792
        return -1;
2793
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2794
    if (get_bits1(&s->gb) == 0) /* marker */
2795
        return -1;
2796
    s->width = width;
2797
    s->height = height;
2798

    
2799
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2800
    skip_bits(&s->gb, 1);
2801

    
2802
    /* get matrix */
2803
    if (get_bits1(&s->gb)) {
2804
        for(i=0;i<64;i++) {
2805
            v = get_bits(&s->gb, 8);
2806
            if(v==0){
2807
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2808
                return -1;
2809
            }
2810
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2811
            s->intra_matrix[j] = v;
2812
            s->chroma_intra_matrix[j] = v;
2813
        }
2814
#ifdef DEBUG
2815
        dprintf("intra matrix present\n");
2816
        for(i=0;i<64;i++)
2817
            dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2818
        printf("\n");
2819
#endif
2820
    } else {
2821
        for(i=0;i<64;i++) {
2822
            j = s->dsp.idct_permutation[i];
2823
            v = ff_mpeg1_default_intra_matrix[i];
2824
            s->intra_matrix[j] = v;
2825
            s->chroma_intra_matrix[j] = v;
2826
        }
2827
    }
2828
    if (get_bits1(&s->gb)) {
2829
        for(i=0;i<64;i++) {
2830
            v = get_bits(&s->gb, 8);
2831
            if(v==0){
2832
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2833
                return -1;
2834
            }
2835
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2836
            s->inter_matrix[j] = v;
2837
            s->chroma_inter_matrix[j] = v;
2838
        }
2839
#ifdef DEBUG
2840
        dprintf("non intra matrix present\n");
2841
        for(i=0;i<64;i++)
2842
            dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2843
        printf("\n");
2844
#endif
2845
    } else {
2846
        for(i=0;i<64;i++) {
2847
            int j= s->dsp.idct_permutation[i];
2848
            v = ff_mpeg1_default_non_intra_matrix[i];
2849
            s->inter_matrix[j] = v;
2850
            s->chroma_inter_matrix[j] = v;
2851
        }
2852
    }
2853
    
2854
    if(show_bits(&s->gb, 23) != 0){
2855
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2856
        return -1;
2857
    }
2858

    
2859
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2860
    s->progressive_sequence = 1;
2861
    s->progressive_frame = 1;
2862
    s->picture_structure = PICT_FRAME;
2863
    s->frame_pred_frame_dct = 1;
2864
    s->chroma_format = 1;
2865
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2866
    avctx->sub_id = 1; /* indicates mpeg1 */
2867
    s->out_format = FMT_MPEG1;
2868
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2869
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2870
    
2871
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2872
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2873
               s->avctx->rc_buffer_size, s->bit_rate);
2874
    
2875
    return 0;
2876
}
2877

    
2878
static int vcr2_init_sequence(AVCodecContext *avctx)
2879
{
2880
    Mpeg1Context *s1 = avctx->priv_data;
2881
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2882
    int i, v;
2883

    
2884
    /* start new mpeg1 context decoding */
2885
    s->out_format = FMT_MPEG1;
2886
    if (s1->mpeg_enc_ctx_allocated) {
2887
        MPV_common_end(s);
2888
    }
2889
    s->width  = avctx->coded_width;
2890
    s->height = avctx->coded_height;
2891
    avctx->has_b_frames= 0; //true?
2892
    s->low_delay= 1;
2893

    
2894
    if(avctx->xvmc_acceleration){
2895
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2896
    }else{
2897
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2898
    }
2899

    
2900
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2901
        if( avctx->idct_algo == FF_IDCT_AUTO )
2902
            avctx->idct_algo = FF_IDCT_SIMPLE;
2903
    
2904
    if (MPV_common_init(s) < 0)
2905
        return -1;
2906
    exchange_uv(s);//common init reset pblocks, so we swap them here
2907
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2908
    s1->mpeg_enc_ctx_allocated = 1;
2909

    
2910
    for(i=0;i<64;i++) {
2911
        int j= s->dsp.idct_permutation[i];
2912
        v = ff_mpeg1_default_intra_matrix[i];
2913
        s->intra_matrix[j] = v;
2914
        s->chroma_intra_matrix[j] = v;
2915

    
2916
        v = ff_mpeg1_default_non_intra_matrix[i];
2917
        s->inter_matrix[j] = v;
2918
        s->chroma_inter_matrix[j] = v;
2919
    }
2920

    
2921
    s->progressive_sequence = 1;
2922
    s->progressive_frame = 1;
2923
    s->picture_structure = PICT_FRAME;
2924
    s->frame_pred_frame_dct = 1;
2925
    s->chroma_format = 1;
2926
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2927
    avctx->sub_id = 2; /* indicates mpeg2 */
2928
    return 0;
2929
}
2930

    
2931

    
2932
static void mpeg_decode_user_data(AVCodecContext *avctx, 
2933
                                  const uint8_t *buf, int buf_size)
2934
{
2935
    const uint8_t *p;
2936
    int len, flags;
2937
    p = buf;
2938
    len = buf_size;
2939

    
2940
    /* we parse the DTG active format information */
2941
    if (len >= 5 &&
2942
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2943
        flags = p[4];
2944
        p += 5;
2945
        len -= 5;
2946
        if (flags & 0x80) {
2947
            /* skip event id */
2948
            if (len < 2)
2949
                return;
2950
            p += 2;
2951
            len -= 2;
2952
        }
2953
        if (flags & 0x40) {
2954
            if (len < 1)
2955
                return;
2956
            avctx->dtg_active_format = p[0] & 0x0f;
2957
        }
2958
    }
2959
}
2960

    
2961
static void mpeg_decode_gop(AVCodecContext *avctx, 
2962
                            const uint8_t *buf, int buf_size){
2963
    Mpeg1Context *s1 = avctx->priv_data;
2964
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2965

    
2966
    int drop_frame_flag;
2967
    int time_code_hours, time_code_minutes;
2968
    int time_code_seconds, time_code_pictures;
2969
    int broken_link;
2970

    
2971
    init_get_bits(&s->gb, buf, buf_size*8);
2972

    
2973
    drop_frame_flag = get_bits1(&s->gb);
2974
    
2975
    time_code_hours=get_bits(&s->gb,5);
2976
    time_code_minutes = get_bits(&s->gb,6);
2977
    skip_bits1(&s->gb);//marker bit
2978
    time_code_seconds = get_bits(&s->gb,6);
2979
    time_code_pictures = get_bits(&s->gb,6);
2980

    
2981
    /*broken_link indicate that after editing the
2982
      reference frames of the first B-Frames after GOP I-Frame
2983
      are missing (open gop)*/
2984
    broken_link = get_bits1(&s->gb);
2985

    
2986
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2987
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2988
            time_code_hours, time_code_minutes, time_code_seconds,
2989
            time_code_pictures, broken_link);
2990
}
2991
/**
2992
 * finds the end of the current frame in the bitstream.
2993
 * @return the position of the first byte of the next frame, or -1
2994
 */
2995
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2996
{
2997
    int i;
2998
    uint32_t state;
2999
    
3000
    state= pc->state;
3001
    
3002
    i=0;
3003
    if(!pc->frame_start_found){
3004
        for(i=0; i<buf_size; i++){
3005
            state= (state<<8) | buf[i];
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
            state= (state<<8) | buf[i];
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
    int ret, start_code, input_size;
3042
    AVFrame *picture = data;
3043
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
3044
    dprintf("fill_buffer\n");
3045

    
3046
    if (buf_size == 0) {
3047
        /* special case for last picture */
3048
        if (s2->low_delay==0 && s2->next_picture_ptr) {
3049
            *picture= *(AVFrame*)s2->next_picture_ptr;
3050
            s2->next_picture_ptr= NULL;
3051

    
3052
            *data_size = sizeof(AVFrame);
3053
        }
3054
        return 0;
3055
    }
3056

    
3057
    if(s2->flags&CODEC_FLAG_TRUNCATED){
3058
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3059
        
3060
        if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3061
            return buf_size;
3062
    }    
3063
    
3064
    buf_ptr = buf;
3065
    buf_end = buf + buf_size;
3066

    
3067
#if 0    
3068
    if (s->repeat_field % 2 == 1) { 
3069
        s->repeat_field++;
3070
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3071
        //        s2->picture_number, s->repeat_field);
3072
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3073
            *data_size = sizeof(AVPicture);
3074
            goto the_end;
3075
        }
3076
    }
3077
#endif
3078

    
3079
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3080
        vcr2_init_sequence(avctx);
3081
    
3082
    s->slice_count= 0;
3083
        
3084
    for(;;) {
3085
        /* find start next code */
3086
        start_code = find_start_code(&buf_ptr, buf_end);
3087
        if (start_code < 0){
3088
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3089
                if(avctx->thread_count > 1){
3090
                    int i;
3091

    
3092
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3093
                    for(i=0; i<s->slice_count; i++)
3094
                        s2->error_count += s2->thread_context[i]->error_count;
3095
                }
3096
                if (slice_end(avctx, picture)) {
3097
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3098
                        *data_size = sizeof(AVPicture);
3099
                }
3100
            }
3101
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3102
        }
3103
        
3104
        input_size = buf_end - buf_ptr;
3105

    
3106
        if(avctx->debug & FF_DEBUG_STARTCODE){
3107
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3108
        }
3109

    
3110
                /* prepare data for next start code */
3111
                switch(start_code) {
3112
                case SEQ_START_CODE:
3113
                    mpeg1_decode_sequence(avctx, buf_ptr, 
3114
                                          input_size);
3115
                    break;
3116
                            
3117
                case PICTURE_START_CODE:
3118
                    /* we have a complete image : we try to decompress it */
3119
                    mpeg1_decode_picture(avctx, 
3120
                                         buf_ptr, input_size);
3121
                    break;
3122
                case EXT_START_CODE:
3123
                    mpeg_decode_extension(avctx,
3124
                                          buf_ptr, input_size);
3125
                    break;
3126
                case USER_START_CODE:
3127
                    mpeg_decode_user_data(avctx, 
3128
                                          buf_ptr, input_size);
3129
                    break;
3130
                case GOP_START_CODE:
3131
                    s2->first_field=0;
3132
                    mpeg_decode_gop(avctx, 
3133
                                          buf_ptr, input_size);
3134
                    break;
3135
                default:
3136
                    if (start_code >= SLICE_MIN_START_CODE &&
3137
                        start_code <= SLICE_MAX_START_CODE) {
3138
                        int mb_y= start_code - SLICE_MIN_START_CODE;
3139
                        
3140
                        if(s2->last_picture_ptr==NULL){
3141
                        /* skip b frames if we dont have reference frames */
3142
                            if(s2->pict_type==B_TYPE) break;
3143
                        /* skip P frames if we dont have reference frame no valid header */
3144
                            if(s2->pict_type==P_TYPE && !s2->first_slice) break;
3145
                        }
3146
                        /* skip b frames if we are in a hurry */
3147
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3148
                        if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3149
                           ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3150
                           || avctx->skip_frame >= AVDISCARD_ALL)
3151
                            break;
3152
                        /* skip everything if we are in a hurry>=5 */
3153
                        if(avctx->hurry_up>=5) break;
3154
                        
3155
                        if (!s->mpeg_enc_ctx_allocated) break;
3156

    
3157
                        if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3158
                            if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3159
                                break;
3160
                        }
3161
                        
3162
                        if(s2->first_slice){
3163
                            s2->first_slice=0;
3164
                            if(mpeg_field_start(s2) < 0)
3165
                                return -1;
3166
                        }
3167
                        
3168
                        if(avctx->thread_count > 1){
3169
                            int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3170
                            if(threshold <= mb_y){
3171
                                MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3172
                                
3173
                                thread_context->start_mb_y= mb_y;
3174
                                thread_context->end_mb_y  = s2->mb_height;
3175
                                if(s->slice_count){
3176
                                    s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3177
                                    ff_update_duplicate_context(thread_context, s2);
3178
                                }
3179
                                init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3180
                                s->slice_count++;
3181
                            }
3182
                            buf_ptr += 2; //FIXME add minimum num of bytes per slice
3183
                        }else{
3184
                            ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3185
                            emms_c();
3186

    
3187
                            if(ret < 0){
3188
                                if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3189
                                    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);
3190
                            }else{
3191
                                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);
3192
                            }
3193
                        }
3194
                    }
3195
                    break;
3196
                }
3197
    }
3198
}
3199

    
3200
static int mpeg_decode_end(AVCodecContext *avctx)
3201
{
3202
    Mpeg1Context *s = avctx->priv_data;
3203

    
3204
    if (s->mpeg_enc_ctx_allocated)
3205
        MPV_common_end(&s->mpeg_enc_ctx);
3206
    return 0;
3207
}
3208

    
3209
AVCodec mpeg1video_decoder = {
3210
    "mpeg1video",
3211
    CODEC_TYPE_VIDEO,
3212
    CODEC_ID_MPEG1VIDEO,
3213
    sizeof(Mpeg1Context),
3214
    mpeg_decode_init,
3215
    NULL,
3216
    mpeg_decode_end,
3217
    mpeg_decode_frame,
3218
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3219
    .flush= ff_mpeg_flush,
3220
};
3221

    
3222
AVCodec mpeg2video_decoder = {
3223
    "mpeg2video",
3224
    CODEC_TYPE_VIDEO,
3225
    CODEC_ID_MPEG2VIDEO,
3226
    sizeof(Mpeg1Context),
3227
    mpeg_decode_init,
3228
    NULL,
3229
    mpeg_decode_end,
3230
    mpeg_decode_frame,
3231
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3232
    .flush= ff_mpeg_flush,
3233
};
3234

    
3235
//legacy decoder
3236
AVCodec mpegvideo_decoder = {
3237
    "mpegvideo",
3238
    CODEC_TYPE_VIDEO,
3239
    CODEC_ID_MPEG2VIDEO,
3240
    sizeof(Mpeg1Context),
3241
    mpeg_decode_init,
3242
    NULL,
3243
    mpeg_decode_end,
3244
    mpeg_decode_frame,
3245
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3246
    .flush= ff_mpeg_flush,
3247
};
3248

    
3249
#ifdef CONFIG_ENCODERS
3250

    
3251
AVCodec mpeg1video_encoder = {
3252
    "mpeg1video",
3253
    CODEC_TYPE_VIDEO,
3254
    CODEC_ID_MPEG1VIDEO,
3255
    sizeof(MpegEncContext),
3256
    encode_init,
3257
    MPV_encode_picture,
3258
    MPV_encode_end,
3259
    .supported_framerates= frame_rate_tab+1,
3260
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3261
    .capabilities= CODEC_CAP_DELAY,
3262
};
3263

    
3264
AVCodec mpeg2video_encoder = {
3265
    "mpeg2video",
3266
    CODEC_TYPE_VIDEO,
3267
    CODEC_ID_MPEG2VIDEO,
3268
    sizeof(MpegEncContext),
3269
    encode_init,
3270
    MPV_encode_picture,
3271
    MPV_encode_end,
3272
    .supported_framerates= frame_rate_tab+1,
3273
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3274
    .capabilities= CODEC_CAP_DELAY,
3275
};
3276
#endif
3277

    
3278
#ifdef HAVE_XVMC
3279
static int mpeg_mc_decode_init(AVCodecContext *avctx){
3280
    Mpeg1Context *s;
3281

    
3282
    if( avctx->thread_count > 1) 
3283
        return -1;
3284
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3285
        return -1;
3286
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3287
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3288
    }
3289
    mpeg_decode_init(avctx);
3290
    s = avctx->priv_data;
3291

    
3292
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3293
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3294

    
3295
    return 0;
3296
}
3297

    
3298
AVCodec mpeg_xvmc_decoder = {
3299
    "mpegvideo_xvmc",
3300
    CODEC_TYPE_VIDEO,
3301
    CODEC_ID_MPEG2VIDEO_XVMC,
3302
    sizeof(Mpeg1Context),
3303
    mpeg_mc_decode_init,
3304
    NULL,
3305
    mpeg_decode_end,
3306
    mpeg_decode_frame,
3307
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3308
    .flush= ff_mpeg_flush,
3309
};
3310

    
3311
#endif
3312

    
3313
/* this is ugly i know, but the alternative is too make 
3314
   hundreds of vars global and prefix them with ff_mpeg1_
3315
   which is far uglier. */
3316
#include "mdec.c"