Statistics
| Branch: | Revision:

ffmpeg / libavcodec / mpeg12.c @ 307eb248

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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
98
static uint8_t  uni_mpeg2_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, 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=   rl->table_vlc[code][1]+1;
171
                bits= (rl->table_vlc[code][0]<<1) + sign;
172
            } else {
173
                len=  rl->table_vlc[111/*rl->n*/][1]+6;
174
                bits= rl->table_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_len [UNI_AC_ENC_INDEX(run, i)]= len;
192
        }
193
    }
194
}
195

    
196

    
197
static int find_frame_rate_index(MpegEncContext *s){
198
    int i;
199
    int64_t dmin= INT64_MAX;
200
    int64_t d;
201

    
202
    for(i=1;i<14;i++) {
203
        int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->time_base.num;
204
        int64_t n1= 1001LL*s->avctx->time_base.den;
205
        if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
206

    
207
        d = ABS(n0 - n1);
208
        if(d < dmin){
209
            dmin=d;
210
            s->frame_rate_index= i;
211
        }
212
    }
213
    if(dmin)
214
        return -1;
215
    else
216
        return 0;
217
}
218

    
219
static int encode_init(AVCodecContext *avctx)
220
{
221
    MpegEncContext *s = avctx->priv_data;
222

    
223
    if(MPV_encode_init(avctx) < 0)
224
        return -1;
225

    
226
    if(find_frame_rate_index(s) < 0){
227
        if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
228
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
229
            return -1;
230
        }else{
231
            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);
232
        }
233
    }
234

    
235
    return 0;
236
}
237

    
238
static void put_header(MpegEncContext *s, int header)
239
{
240
    align_put_bits(&s->pb);
241
    put_bits(&s->pb, 16, header>>16);
242
    put_bits(&s->pb, 16, header&0xFFFF);
243
}
244

    
245
/* put sequence header if needed */
246
static void mpeg1_encode_sequence_header(MpegEncContext *s)
247
{
248
        unsigned int vbv_buffer_size;
249
        unsigned int fps, v;
250
        int i;
251
        uint64_t time_code;
252
        float best_aspect_error= 1E10;
253
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
254
        int constraint_parameter_flag;
255

    
256
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
257

    
258
        if (s->current_picture.key_frame) {
259
            AVRational framerate= frame_rate_tab[s->frame_rate_index];
260

    
261
            /* mpeg1 header repeated every gop */
262
            put_header(s, SEQ_START_CODE);
263

    
264
            put_bits(&s->pb, 12, s->width);
265
            put_bits(&s->pb, 12, s->height);
266

    
267
            for(i=1; i<15; i++){
268
                float error= aspect_ratio;
269
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
270
                    error-= 1.0/mpeg1_aspect[i];
271
                else
272
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
273

    
274
                error= ABS(error);
275

    
276
                if(error < best_aspect_error){
277
                    best_aspect_error= error;
278
                    s->aspect_ratio_info= i;
279
                }
280
            }
281

    
282
            put_bits(&s->pb, 4, s->aspect_ratio_info);
283
            put_bits(&s->pb, 4, s->frame_rate_index);
284

    
285
            if(s->avctx->rc_max_rate){
286
                v = (s->avctx->rc_max_rate + 399) / 400;
287
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
288
                    v = 0x3ffff;
289
            }else{
290
                v= 0x3FFFF;
291
            }
292

    
293
            if(s->avctx->rc_buffer_size)
294
                vbv_buffer_size = s->avctx->rc_buffer_size;
295
            else
296
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
297
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
298
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
299

    
300
            put_bits(&s->pb, 18, v & 0x3FFFF);
301
            put_bits(&s->pb, 1, 1); /* marker */
302
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
303

    
304
            constraint_parameter_flag=
305
                s->width <= 768 && s->height <= 576 &&
306
                s->mb_width * s->mb_height <= 396 &&
307
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
308
                framerate.num <= framerate.den*30 &&
309
                s->avctx->me_range && s->avctx->me_range < 128 &&
310
                vbv_buffer_size <= 20 &&
311
                v <= 1856000/400 &&
312
                s->codec_id == CODEC_ID_MPEG1VIDEO;
313

    
314
            put_bits(&s->pb, 1, constraint_parameter_flag);
315

    
316
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
317
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
318

    
319
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
320
                put_header(s, EXT_START_CODE);
321
                put_bits(&s->pb, 4, 1); //seq ext
322
                put_bits(&s->pb, 1, 0); //esc
323

    
324
                if(s->avctx->profile == FF_PROFILE_UNKNOWN){
325
                    put_bits(&s->pb, 3, 4); //profile
326
                }else{
327
                    put_bits(&s->pb, 3, s->avctx->profile); //profile
328
                }
329

    
330
                if(s->avctx->level == FF_LEVEL_UNKNOWN){
331
                    put_bits(&s->pb, 4, 8); //level
332
                }else{
333
                    put_bits(&s->pb, 4, s->avctx->level); //level
334
                }
335

    
336
                put_bits(&s->pb, 1, s->progressive_sequence);
337
                put_bits(&s->pb, 2, 1); //chroma format 4:2:0
338
                put_bits(&s->pb, 2, 0); //horizontal size ext
339
                put_bits(&s->pb, 2, 0); //vertical size ext
340
                put_bits(&s->pb, 12, v>>18); //bitrate ext
341
                put_bits(&s->pb, 1, 1); //marker
342
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
343
                put_bits(&s->pb, 1, s->low_delay);
344
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
345
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
346
            }
347

    
348
            put_header(s, GOP_START_CODE);
349
            put_bits(&s->pb, 1, 0); /* do drop frame */
350
            /* time code : we must convert from the real frame rate to a
351
               fake mpeg frame rate in case of low frame rate */
352
            fps = (framerate.num + framerate.den/2)/ framerate.den;
353
            time_code = s->current_picture_ptr->coded_picture_number;
354

    
355
            s->gop_picture_number = time_code;
356
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
357
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
358
            put_bits(&s->pb, 1, 1);
359
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
360
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
361
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
362
            put_bits(&s->pb, 1, 0); /* broken link */
363
        }
364
}
365

    
366
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
367
    while (run >= 33) {
368
        put_bits(&s->pb, 11, 0x008);
369
        run -= 33;
370
    }
371
    put_bits(&s->pb, mbAddrIncrTable[run][1],
372
             mbAddrIncrTable[run][0]);
373
}
374
#endif //CONFIG_ENCODERS
375

    
376
static void common_init(MpegEncContext *s)
377
{
378

    
379
    s->y_dc_scale_table=
380
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
381

    
382
}
383

    
384
void ff_mpeg1_clean_buffers(MpegEncContext *s){
385
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
386
    s->last_dc[1] = s->last_dc[0];
387
    s->last_dc[2] = s->last_dc[0];
388
    memset(s->last_mv, 0, sizeof(s->last_mv));
389
}
390

    
391
#ifdef CONFIG_ENCODERS
392

    
393
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
394
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
395
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
396
    put_bits(&s->pb, 1, 0); /* slice extra information */
397
}
398

    
399
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
400
{
401
    mpeg1_encode_sequence_header(s);
402

    
403
    /* mpeg1 picture header */
404
    put_header(s, PICTURE_START_CODE);
405
    /* temporal reference */
406

    
407
    // RAL: s->picture_number instead of s->fake_picture_number
408
    put_bits(&s->pb, 10, (s->picture_number -
409
                          s->gop_picture_number) & 0x3ff);
410
    put_bits(&s->pb, 3, s->pict_type);
411

    
412
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
413
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
414

    
415
    // RAL: Forward f_code also needed for B frames
416
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
417
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
418
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
419
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
420
        else
421
            put_bits(&s->pb, 3, 7); /* forward_f_code */
422
    }
423

    
424
    // RAL: Backward f_code necessary for B frames
425
    if (s->pict_type == B_TYPE) {
426
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
427
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
428
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
429
        else
430
            put_bits(&s->pb, 3, 7); /* backward_f_code */
431
    }
432

    
433
    put_bits(&s->pb, 1, 0); /* extra bit picture */
434

    
435
    s->frame_pred_frame_dct = 1;
436
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
437
        put_header(s, EXT_START_CODE);
438
        put_bits(&s->pb, 4, 8); //pic ext
439
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
440
            put_bits(&s->pb, 4, s->f_code);
441
            put_bits(&s->pb, 4, s->f_code);
442
        }else{
443
            put_bits(&s->pb, 8, 255);
444
        }
445
        if (s->pict_type == B_TYPE) {
446
            put_bits(&s->pb, 4, s->b_code);
447
            put_bits(&s->pb, 4, s->b_code);
448
        }else{
449
            put_bits(&s->pb, 8, 255);
450
        }
451
        put_bits(&s->pb, 2, s->intra_dc_precision);
452

    
453
        assert(s->picture_structure == PICT_FRAME);
454
        put_bits(&s->pb, 2, s->picture_structure);
455
        if (s->progressive_sequence) {
456
            put_bits(&s->pb, 1, 0); /* no repeat */
457
        } else {
458
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
459
        }
460
        /* XXX: optimize the generation of this flag with entropy
461
           measures */
462
        s->frame_pred_frame_dct = s->progressive_sequence;
463

    
464
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
465
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
466
        put_bits(&s->pb, 1, s->q_scale_type);
467
        put_bits(&s->pb, 1, s->intra_vlc_format);
468
        put_bits(&s->pb, 1, s->alternate_scan);
469
        put_bits(&s->pb, 1, s->repeat_first_field);
470
        s->progressive_frame = s->progressive_sequence;
471
        put_bits(&s->pb, 1, s->chroma_420_type=s->progressive_frame);
472
        put_bits(&s->pb, 1, s->progressive_frame);
473
        put_bits(&s->pb, 1, 0); //composite_display_flag
474
    }
475
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
476
        int i;
477

    
478
        put_header(s, USER_START_CODE);
479
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
480
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
481
        }
482
    }
483

    
484
    s->mb_y=0;
485
    ff_mpeg1_encode_slice_header(s);
486
}
487

    
488
static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
489
                                int has_mv, int field_motion)
490
{
491
    put_bits(&s->pb, n, bits);
492
    if (!s->frame_pred_frame_dct) {
493
        if (has_mv)
494
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
495
        put_bits(&s->pb, 1, s->interlaced_dct);
496
    }
497
}
498

    
499
void mpeg1_encode_mb(MpegEncContext *s,
500
                     DCTELEM block[6][64],
501
                     int motion_x, int motion_y)
502
{
503
    int i, cbp;
504
    const int mb_x = s->mb_x;
505
    const int mb_y = s->mb_y;
506
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
507

    
508
    /* compute cbp */
509
    cbp = 0;
510
    for(i=0;i<6;i++) {
511
        if (s->block_last_index[i] >= 0)
512
            cbp |= 1 << (5 - i);
513
    }
514

    
515
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
516
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
517
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
518
        (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
519
        ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
520
        s->mb_skip_run++;
521
        s->qscale -= s->dquant;
522
        s->skip_count++;
523
        s->misc_bits++;
524
        s->last_bits++;
525
        if(s->pict_type == P_TYPE){
526
            s->last_mv[0][1][0]= s->last_mv[0][0][0]=
527
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
528
        }
529
    } else {
530
        if(first_mb){
531
            assert(s->mb_skip_run == 0);
532
            encode_mb_skip_run(s, s->mb_x);
533
        }else{
534
            encode_mb_skip_run(s, s->mb_skip_run);
535
        }
536

    
537
        if (s->pict_type == I_TYPE) {
538
            if(s->dquant && cbp){
539
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
540
                put_bits(&s->pb, 5, s->qscale);
541
            }else{
542
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
543
                s->qscale -= s->dquant;
544
            }
545
            s->misc_bits+= get_bits_diff(s);
546
            s->i_count++;
547
        } else if (s->mb_intra) {
548
            if(s->dquant && cbp){
549
                put_mb_modes(s, 6, 0x01, 0, 0);
550
                put_bits(&s->pb, 5, s->qscale);
551
            }else{
552
                put_mb_modes(s, 5, 0x03, 0, 0);
553
                s->qscale -= s->dquant;
554
            }
555
            s->misc_bits+= get_bits_diff(s);
556
            s->i_count++;
557
            memset(s->last_mv, 0, sizeof(s->last_mv));
558
        } else if (s->pict_type == P_TYPE) {
559
            if(s->mv_type == MV_TYPE_16X16){
560
                if (cbp != 0) {
561
                    if ((motion_x|motion_y) == 0) {
562
                        if(s->dquant){
563
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
564
                            put_bits(&s->pb, 5, s->qscale);
565
                        }else{
566
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
567
                        }
568
                        s->misc_bits+= get_bits_diff(s);
569
                    } else {
570
                        if(s->dquant){
571
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
572
                            put_bits(&s->pb, 5, s->qscale);
573
                        }else{
574
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
575
                        }
576
                        s->misc_bits+= get_bits_diff(s);
577
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
578
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
579
                        s->mv_bits+= get_bits_diff(s);
580
                    }
581
                } else {
582
                    put_bits(&s->pb, 3, 1); /* motion only */
583
                    if (!s->frame_pred_frame_dct)
584
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
585
                    s->misc_bits+= get_bits_diff(s);
586
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
587
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
588
                    s->qscale -= s->dquant;
589
                    s->mv_bits+= get_bits_diff(s);
590
                }
591
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
592
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
593
            }else{
594
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
595

    
596
                if (cbp) {
597
                    if(s->dquant){
598
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
599
                        put_bits(&s->pb, 5, s->qscale);
600
                    }else{
601
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
602
                    }
603
                } else {
604
                    put_bits(&s->pb, 3, 1); /* motion only */
605
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
606
                    s->qscale -= s->dquant;
607
                }
608
                s->misc_bits+= get_bits_diff(s);
609
                for(i=0; i<2; i++){
610
                    put_bits(&s->pb, 1, s->field_select[0][i]);
611
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
612
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
613
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
614
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
615
                }
616
                s->mv_bits+= get_bits_diff(s);
617
            }
618
            if(cbp)
619
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
620
            s->f_count++;
621
        } else{
622
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
623

    
624
            if(s->mv_type == MV_TYPE_16X16){
625
                if (cbp){    // With coded bloc pattern
626
                    if (s->dquant) {
627
                        if(s->mv_dir == MV_DIR_FORWARD)
628
                            put_mb_modes(s, 6, 3, 1, 0);
629
                        else
630
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
631
                        put_bits(&s->pb, 5, s->qscale);
632
                    } else {
633
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
634
                    }
635
                }else{    // No coded bloc pattern
636
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
637
                    if (!s->frame_pred_frame_dct)
638
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
639
                    s->qscale -= s->dquant;
640
                }
641
                s->misc_bits += get_bits_diff(s);
642
                if (s->mv_dir&MV_DIR_FORWARD){
643
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
644
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
645
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
646
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
647
                    s->f_count++;
648
                }
649
                if (s->mv_dir&MV_DIR_BACKWARD){
650
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
651
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
652
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
653
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
654
                    s->b_count++;
655
                }
656
            }else{
657
                assert(s->mv_type == MV_TYPE_FIELD);
658
                assert(!s->frame_pred_frame_dct);
659
                if (cbp){    // With coded bloc pattern
660
                    if (s->dquant) {
661
                        if(s->mv_dir == MV_DIR_FORWARD)
662
                            put_mb_modes(s, 6, 3, 1, 1);
663
                        else
664
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
665
                        put_bits(&s->pb, 5, s->qscale);
666
                    } else {
667
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
668
                    }
669
                }else{    // No coded bloc pattern
670
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
671
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
672
                    s->qscale -= s->dquant;
673
                }
674
                s->misc_bits += get_bits_diff(s);
675
                if (s->mv_dir&MV_DIR_FORWARD){
676
                    for(i=0; i<2; i++){
677
                        put_bits(&s->pb, 1, s->field_select[0][i]);
678
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
679
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
680
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
681
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
682
                    }
683
                    s->f_count++;
684
                }
685
                if (s->mv_dir&MV_DIR_BACKWARD){
686
                    for(i=0; i<2; i++){
687
                        put_bits(&s->pb, 1, s->field_select[1][i]);
688
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
689
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
690
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
691
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
692
                    }
693
                    s->b_count++;
694
                }
695
            }
696
            s->mv_bits += get_bits_diff(s);
697
            if(cbp)
698
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
699
        }
700
        for(i=0;i<6;i++) {
701
            if (cbp & (1 << (5 - i))) {
702
                mpeg1_encode_block(s, block[i], i);
703
            }
704
        }
705
        s->mb_skip_run = 0;
706
        if(s->mb_intra)
707
            s->i_tex_bits+= get_bits_diff(s);
708
        else
709
            s->p_tex_bits+= get_bits_diff(s);
710
    }
711
}
712

    
713
// RAL: Parameter added: f_or_b_code
714
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
715
{
716
    int code, bit_size, l, bits, range, sign;
717

    
718
    if (val == 0) {
719
        /* zero vector */
720
        code = 0;
721
        put_bits(&s->pb,
722
                 mbMotionVectorTable[0][1],
723
                 mbMotionVectorTable[0][0]);
724
    } else {
725
        bit_size = f_or_b_code - 1;
726
        range = 1 << bit_size;
727
        /* modulo encoding */
728
        l= INT_BIT - 5 - bit_size;
729
        val= (val<<l)>>l;
730

    
731
        if (val >= 0) {
732
            val--;
733
            code = (val >> bit_size) + 1;
734
            bits = val & (range - 1);
735
            sign = 0;
736
        } else {
737
            val = -val;
738
            val--;
739
            code = (val >> bit_size) + 1;
740
            bits = val & (range - 1);
741
            sign = 1;
742
        }
743

    
744
        assert(code > 0 && code <= 16);
745

    
746
        put_bits(&s->pb,
747
                 mbMotionVectorTable[code][1],
748
                 mbMotionVectorTable[code][0]);
749

    
750
        put_bits(&s->pb, 1, sign);
751
        if (bit_size > 0) {
752
            put_bits(&s->pb, bit_size, bits);
753
        }
754
    }
755
}
756

    
757
void ff_mpeg1_encode_init(MpegEncContext *s)
758
{
759
    static int done=0;
760

    
761
    common_init(s);
762

    
763
    if(!done){
764
        int f_code;
765
        int mv;
766
        int i;
767

    
768
        done=1;
769
        init_rl(&rl_mpeg1, 1);
770
        if(s->intra_vlc_format)
771
            init_rl(&rl_mpeg2, 1);
772

    
773
        for(i=0; i<64; i++)
774
        {
775
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
776
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
777
        }
778

    
779
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
780
        if(s->intra_vlc_format)
781
            init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
782

    
783
        /* build unified dc encoding tables */
784
        for(i=-255; i<256; i++)
785
        {
786
                int adiff, index;
787
                int bits, code;
788
                int diff=i;
789

    
790
                adiff = ABS(diff);
791
                if(diff<0) diff--;
792
                index = av_log2(2*adiff);
793

    
794
                bits= vlc_dc_lum_bits[index] + index;
795
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
796
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
797

    
798
                bits= vlc_dc_chroma_bits[index] + index;
799
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
800
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
801
        }
802

    
803
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
804

    
805
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
806
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
807
                int len;
808

    
809
                if(mv==0) len= mbMotionVectorTable[0][1];
810
                else{
811
                    int val, bit_size, range, code;
812

    
813
                    bit_size = f_code - 1;
814
                    range = 1 << bit_size;
815

    
816
                    val=mv;
817
                    if (val < 0)
818
                        val = -val;
819
                    val--;
820
                    code = (val >> bit_size) + 1;
821
                    if(code<17){
822
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
823
                    }else{
824
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
825
                    }
826
                }
827

    
828
                mv_penalty[f_code][mv+MAX_MV]= len;
829
            }
830
        }
831

    
832

    
833
        for(f_code=MAX_FCODE; f_code>0; f_code--){
834
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
835
                fcode_tab[mv+MAX_MV]= f_code;
836
            }
837
        }
838
    }
839
    s->me.mv_penalty= mv_penalty;
840
    s->fcode_tab= fcode_tab;
841
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
842
        s->min_qcoeff=-255;
843
        s->max_qcoeff= 255;
844
    }else{
845
        s->min_qcoeff=-2047;
846
        s->max_qcoeff= 2047;
847
    }
848
    if (s->intra_vlc_format) {
849
        s->intra_ac_vlc_length=
850
        s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
851
    } else {
852
        s->intra_ac_vlc_length=
853
        s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
854
    }
855
    s->inter_ac_vlc_length=
856
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
857
}
858

    
859
static inline void encode_dc(MpegEncContext *s, int diff, int component)
860
{
861
  if(((unsigned) (diff+255)) >= 511){
862
        int index;
863

    
864
        if(diff<0){
865
            index= av_log2_16bit(-2*diff);
866
            diff--;
867
        }else{
868
            index= av_log2_16bit(2*diff);
869
        }
870
        if (component == 0) {
871
            put_bits(
872
                &s->pb,
873
                vlc_dc_lum_bits[index] + index,
874
                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
875
        }else{
876
            put_bits(
877
                &s->pb,
878
                vlc_dc_chroma_bits[index] + index,
879
                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
880
        }
881
  }else{
882
    if (component == 0) {
883
        put_bits(
884
            &s->pb,
885
            mpeg1_lum_dc_uni[diff+255]&0xFF,
886
            mpeg1_lum_dc_uni[diff+255]>>8);
887
    } else {
888
        put_bits(
889
            &s->pb,
890
            mpeg1_chr_dc_uni[diff+255]&0xFF,
891
            mpeg1_chr_dc_uni[diff+255]>>8);
892
    }
893
  }
894
}
895

    
896
static void mpeg1_encode_block(MpegEncContext *s,
897
                               DCTELEM *block,
898
                               int n)
899
{
900
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
901
    int code, component;
902
    const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
903

    
904
    last_index = s->block_last_index[n];
905

    
906
    /* DC coef */
907
    if (s->mb_intra) {
908
        component = (n <= 3 ? 0 : n - 4 + 1);
909
        dc = block[0]; /* overflow is impossible */
910
        diff = dc - s->last_dc[component];
911
        encode_dc(s, diff, component);
912
        s->last_dc[component] = dc;
913
        i = 1;
914
        if (s->intra_vlc_format)
915
            table_vlc = rl_mpeg2.table_vlc;
916
    } else {
917
        /* encode the first coefficient : needs to be done here because
918
           it is handled slightly differently */
919
        level = block[0];
920
        if (abs(level) == 1) {
921
                code = ((uint32_t)level >> 31); /* the sign bit */
922
                put_bits(&s->pb, 2, code | 0x02);
923
                i = 1;
924
        } else {
925
            i = 0;
926
            last_non_zero = -1;
927
            goto next_coef;
928
        }
929
    }
930

    
931
    /* now quantify & encode AC coefs */
932
    last_non_zero = i - 1;
933

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

    
946
            alevel= level;
947
            MASK_ABS(sign, alevel)
948
            sign&=1;
949

    
950
            if (alevel <= mpeg1_max_level[0][run]){
951
                code= mpeg1_index_run[0][run] + alevel - 1;
952
                /* store the vlc & sign at once */
953
                put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
954
            } else {
955
                /* escape seems to be pretty rare <5% so i dont optimize it */
956
                put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
957
                /* escape: only clip in this case */
958
                put_bits(&s->pb, 6, run);
959
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
960
                    if (alevel < 128) {
961
                        put_bits(&s->pb, 8, level & 0xff);
962
                    } else {
963
                        if (level < 0) {
964
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
965
                        } else {
966
                            put_bits(&s->pb, 16, level & 0xffff);
967
                        }
968
                    }
969
                }else{
970
                    put_bits(&s->pb, 12, level & 0xfff);
971
                }
972
            }
973
            last_non_zero = i;
974
        }
975
    }
976
    /* end of block */
977
    put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
978
}
979
#endif //CONFIG_ENCODERS
980

    
981
/******************************************/
982
/* decoding */
983

    
984
static VLC dc_lum_vlc;
985
static VLC dc_chroma_vlc;
986
static VLC mv_vlc;
987
static VLC mbincr_vlc;
988
static VLC mb_ptype_vlc;
989
static VLC mb_btype_vlc;
990
static VLC mb_pat_vlc;
991

    
992
static void init_vlcs(void)
993
{
994
    static int done = 0;
995

    
996
    if (!done) {
997
        done = 1;
998

    
999
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1000
                 vlc_dc_lum_bits, 1, 1,
1001
                 vlc_dc_lum_code, 2, 2, 1);
1002
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1003
                 vlc_dc_chroma_bits, 1, 1,
1004
                 vlc_dc_chroma_code, 2, 2, 1);
1005
        init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1006
                 &mbMotionVectorTable[0][1], 2, 1,
1007
                 &mbMotionVectorTable[0][0], 2, 1, 1);
1008
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1009
                 &mbAddrIncrTable[0][1], 2, 1,
1010
                 &mbAddrIncrTable[0][0], 2, 1, 1);
1011
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1012
                 &mbPatTable[0][1], 2, 1,
1013
                 &mbPatTable[0][0], 2, 1, 1);
1014

    
1015
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1016
                 &table_mb_ptype[0][1], 2, 1,
1017
                 &table_mb_ptype[0][0], 2, 1, 1);
1018
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1019
                 &table_mb_btype[0][1], 2, 1,
1020
                 &table_mb_btype[0][0], 2, 1, 1);
1021
        init_rl(&rl_mpeg1, 1);
1022
        init_rl(&rl_mpeg2, 1);
1023

    
1024
        init_2d_vlc_rl(&rl_mpeg1, 1);
1025
        init_2d_vlc_rl(&rl_mpeg2, 1);
1026
    }
1027
}
1028

    
1029
static inline int get_dmv(MpegEncContext *s)
1030
{
1031
    if(get_bits1(&s->gb))
1032
        return 1 - (get_bits1(&s->gb) << 1);
1033
    else
1034
        return 0;
1035
}
1036

    
1037
static inline int get_qscale(MpegEncContext *s)
1038
{
1039
    int qscale = get_bits(&s->gb, 5);
1040
    if (s->q_scale_type) {
1041
        return non_linear_qscale[qscale];
1042
    } else {
1043
        return qscale << 1;
1044
    }
1045
}
1046

    
1047
/* motion type (for mpeg2) */
1048
#define MT_FIELD 1
1049
#define MT_FRAME 2
1050
#define MT_16X8  2
1051
#define MT_DMV   3
1052

    
1053
static int mpeg_decode_mb(MpegEncContext *s,
1054
                          DCTELEM block[12][64])
1055
{
1056
    int i, j, k, cbp, val, mb_type, motion_type;
1057
    const int mb_block_count = 4 + (1<< s->chroma_format);
1058

    
1059
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1060

    
1061
    assert(s->mb_skipped==0);
1062

    
1063
    if (s->mb_skip_run-- != 0) {
1064
        if(s->pict_type == I_TYPE){
1065
            av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1066
            return -1;
1067
        }
1068

    
1069
        /* skip mb */
1070
        s->mb_intra = 0;
1071
        for(i=0;i<12;i++)
1072
            s->block_last_index[i] = -1;
1073
        if(s->picture_structure == PICT_FRAME)
1074
            s->mv_type = MV_TYPE_16X16;
1075
        else
1076
            s->mv_type = MV_TYPE_FIELD;
1077
        if (s->pict_type == P_TYPE) {
1078
            /* if P type, zero motion vector is implied */
1079
            s->mv_dir = MV_DIR_FORWARD;
1080
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1081
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1082
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1083
            s->field_select[0][0]= s->picture_structure - 1;
1084
            s->mb_skipped = 1;
1085
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1086
        } else {
1087
            int mb_type;
1088

    
1089
            if(s->mb_x)
1090
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1091
            else
1092
                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,
1093
            if(IS_INTRA(mb_type))
1094
                return -1;
1095

    
1096
            /* if B type, reuse previous vectors and directions */
1097
            s->mv[0][0][0] = s->last_mv[0][0][0];
1098
            s->mv[0][0][1] = s->last_mv[0][0][1];
1099
            s->mv[1][0][0] = s->last_mv[1][0][0];
1100
            s->mv[1][0][1] = s->last_mv[1][0][1];
1101

    
1102
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1103
                mb_type | MB_TYPE_SKIP;
1104
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1105

    
1106
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1107
                s->mb_skipped = 1;
1108
        }
1109

    
1110
        return 0;
1111
    }
1112

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

    
1148
        if(!s->chroma_y_shift){
1149
            s->dsp.clear_blocks(s->block[6]);
1150
        }
1151

    
1152
        /* compute dct type */
1153
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1154
            !s->frame_pred_frame_dct) {
1155
            s->interlaced_dct = get_bits1(&s->gb);
1156
        }
1157

    
1158
        if (IS_QUANT(mb_type))
1159
            s->qscale = get_qscale(s);
1160

    
1161
        if (s->concealment_motion_vectors) {
1162
            /* just parse them */
1163
            if (s->picture_structure != PICT_FRAME)
1164
                skip_bits1(&s->gb); /* field select */
1165

    
1166
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1167
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1168
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1169
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1170

    
1171
            skip_bits1(&s->gb); /* marker */
1172
        }else
1173
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1174
        s->mb_intra = 1;
1175
#ifdef HAVE_XVMC
1176
        //one 1 we memcpy blocks in xvmcvideo
1177
        if(s->avctx->xvmc_acceleration > 1){
1178
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1179
            if(s->swap_uv){
1180
                exchange_uv(s);
1181
            }
1182
        }
1183
#endif
1184

    
1185
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1186
            if(s->flags2 & CODEC_FLAG2_FAST){
1187
                for(i=0;i<6;i++) {
1188
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1189
                }
1190
            }else{
1191
                for(i=0;i<mb_block_count;i++) {
1192
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1193
                        return -1;
1194
                }
1195
            }
1196
        } else {
1197
            for(i=0;i<6;i++) {
1198
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1199
                    return -1;
1200
            }
1201
        }
1202
    } else {
1203
        if (mb_type & MB_TYPE_ZERO_MV){
1204
            assert(mb_type & MB_TYPE_CBP);
1205

    
1206
            /* compute dct type */
1207
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1208
                !s->frame_pred_frame_dct) {
1209
                s->interlaced_dct = get_bits1(&s->gb);
1210
            }
1211

    
1212
            if (IS_QUANT(mb_type))
1213
                s->qscale = get_qscale(s);
1214

    
1215
            s->mv_dir = MV_DIR_FORWARD;
1216
            if(s->picture_structure == PICT_FRAME)
1217
                s->mv_type = MV_TYPE_16X16;
1218
            else{
1219
                s->mv_type = MV_TYPE_FIELD;
1220
                mb_type |= MB_TYPE_INTERLACED;
1221
                s->field_select[0][0]= s->picture_structure - 1;
1222
            }
1223
            s->last_mv[0][0][0] = 0;
1224
            s->last_mv[0][0][1] = 0;
1225
            s->last_mv[0][1][0] = 0;
1226
            s->last_mv[0][1][1] = 0;
1227
            s->mv[0][0][0] = 0;
1228
            s->mv[0][0][1] = 0;
1229
        }else{
1230
            assert(mb_type & MB_TYPE_L0L1);
1231
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1232
            /* get additionnal motion vector type */
1233
            if (s->frame_pred_frame_dct)
1234
                motion_type = MT_FRAME;
1235
            else{
1236
                motion_type = get_bits(&s->gb, 2);
1237
            }
1238

    
1239
            /* compute dct type */
1240
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1241
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1242
                s->interlaced_dct = get_bits1(&s->gb);
1243
            }
1244

    
1245
            if (IS_QUANT(mb_type))
1246
                s->qscale = get_qscale(s);
1247

    
1248
            /* motion vectors */
1249
            s->mv_dir = 0;
1250
            for(i=0;i<2;i++) {
1251
                if (USES_LIST(mb_type, i)) {
1252
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1253
                    dprintf("motion_type=%d\n", motion_type);
1254
                    switch(motion_type) {
1255
                    case MT_FRAME: /* or MT_16X8 */
1256
                        if (s->picture_structure == PICT_FRAME) {
1257
                            /* MT_FRAME */
1258
                            mb_type |= MB_TYPE_16x16;
1259
                            s->mv_type = MV_TYPE_16X16;
1260
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1261
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1262
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1263
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1264
                            /* full_pel: only for mpeg1 */
1265
                            if (s->full_pel[i]){
1266
                                s->mv[i][0][0] <<= 1;
1267
                                s->mv[i][0][1] <<= 1;
1268
                            }
1269
                        } else {
1270
                            /* MT_16X8 */
1271
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1272
                            s->mv_type = MV_TYPE_16X8;
1273
                            for(j=0;j<2;j++) {
1274
                                s->field_select[i][j] = get_bits1(&s->gb);
1275
                                for(k=0;k<2;k++) {
1276
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1277
                                                             s->last_mv[i][j][k]);
1278
                                    s->last_mv[i][j][k] = val;
1279
                                    s->mv[i][j][k] = val;
1280
                                }
1281
                            }
1282
                        }
1283
                        break;
1284
                    case MT_FIELD:
1285
                        s->mv_type = MV_TYPE_FIELD;
1286
                        if (s->picture_structure == PICT_FRAME) {
1287
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1288
                            for(j=0;j<2;j++) {
1289
                                s->field_select[i][j] = get_bits1(&s->gb);
1290
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1291
                                                         s->last_mv[i][j][0]);
1292
                                s->last_mv[i][j][0] = val;
1293
                                s->mv[i][j][0] = val;
1294
                                dprintf("fmx=%d\n", val);
1295
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1296
                                                         s->last_mv[i][j][1] >> 1);
1297
                                s->last_mv[i][j][1] = val << 1;
1298
                                s->mv[i][j][1] = val;
1299
                                dprintf("fmy=%d\n", val);
1300
                            }
1301
                        } else {
1302
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1303
                            s->field_select[i][0] = get_bits1(&s->gb);
1304
                            for(k=0;k<2;k++) {
1305
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1306
                                                         s->last_mv[i][0][k]);
1307
                                s->last_mv[i][0][k] = val;
1308
                                s->last_mv[i][1][k] = val;
1309
                                s->mv[i][0][k] = val;
1310
                            }
1311
                        }
1312
                        break;
1313
                    case MT_DMV:
1314
                        {
1315
                            int dmx, dmy, mx, my, m;
1316

    
1317
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1318
                                                    s->last_mv[i][0][0]);
1319
                            s->last_mv[i][0][0] = mx;
1320
                            s->last_mv[i][1][0] = mx;
1321
                            dmx = get_dmv(s);
1322
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1323
                                                    s->last_mv[i][0][1] >> 1);
1324
                            dmy = get_dmv(s);
1325
                            s->mv_type = MV_TYPE_DMV;
1326

    
1327

    
1328
                            s->last_mv[i][0][1] = my<<1;
1329
                            s->last_mv[i][1][1] = my<<1;
1330

    
1331
                            s->mv[i][0][0] = mx;
1332
                            s->mv[i][0][1] = my;
1333
                            s->mv[i][1][0] = mx;//not used
1334
                            s->mv[i][1][1] = my;//not used
1335

    
1336
                            if (s->picture_structure == PICT_FRAME) {
1337
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1338

    
1339
                                //m = 1 + 2 * s->top_field_first;
1340
                                m = s->top_field_first ? 1 : 3;
1341

    
1342
                                /* top -> top pred */
1343
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1344
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1345
                                m = 4 - m;
1346
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1347
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1348
                            } else {
1349
                                mb_type |= MB_TYPE_16x16;
1350

    
1351
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1352
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1353
                                if(s->picture_structure == PICT_TOP_FIELD)
1354
                                    s->mv[i][2][1]--;
1355
                                else
1356
                                    s->mv[i][2][1]++;
1357
                            }
1358
                        }
1359
                        break;
1360
                    default:
1361
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1362
                        return -1;
1363
                    }
1364
                }
1365
            }
1366
        }
1367

    
1368
        s->mb_intra = 0;
1369
        if (HAS_CBP(mb_type)) {
1370
            s->dsp.clear_blocks(s->block[0]);
1371

    
1372
            if(!s->chroma_y_shift){
1373
                s->dsp.clear_blocks(s->block[6]);
1374
            }
1375

    
1376
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1377
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1378
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1379
                return -1;
1380
            }
1381
            if(mb_block_count > 6){
1382
                 cbp<<= mb_block_count-6;
1383
                 cbp |= get_bits(&s->gb, mb_block_count-6);
1384
            }
1385

    
1386
#ifdef HAVE_XVMC
1387
            //on 1 we memcpy blocks in xvmcvideo
1388
            if(s->avctx->xvmc_acceleration > 1){
1389
                XVMC_pack_pblocks(s,cbp);
1390
                if(s->swap_uv){
1391
                    exchange_uv(s);
1392
                }
1393
            }
1394
#endif
1395

    
1396
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1397
                if(s->flags2 & CODEC_FLAG2_FAST){
1398
                    for(i=0;i<6;i++) {
1399
                        if(cbp & 32) {
1400
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1401
                        } else {
1402
                            s->block_last_index[i] = -1;
1403
                        }
1404
                        cbp+=cbp;
1405
                    }
1406
                }else{
1407
                    cbp<<= 12-mb_block_count;
1408

    
1409
                    for(i=0;i<mb_block_count;i++) {
1410
                        if ( cbp & (1<<11) ) {
1411
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1412
                                return -1;
1413
                        } else {
1414
                            s->block_last_index[i] = -1;
1415
                        }
1416
                        cbp+=cbp;
1417
                    }
1418
                }
1419
            } else {
1420
                if(s->flags2 & CODEC_FLAG2_FAST){
1421
                    for(i=0;i<6;i++) {
1422
                        if (cbp & 32) {
1423
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1424
                        } else {
1425
                            s->block_last_index[i] = -1;
1426
                        }
1427
                        cbp+=cbp;
1428
                    }
1429
                }else{
1430
                    for(i=0;i<6;i++) {
1431
                        if (cbp & 32) {
1432
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1433
                                return -1;
1434
                        } else {
1435
                            s->block_last_index[i] = -1;
1436
                        }
1437
                        cbp+=cbp;
1438
                    }
1439
                }
1440
            }
1441
        }else{
1442
            for(i=0;i<12;i++)
1443
                s->block_last_index[i] = -1;
1444
        }
1445
    }
1446

    
1447
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1448

    
1449
    return 0;
1450
}
1451

    
1452
/* as h263, but only 17 codes */
1453
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1454
{
1455
    int code, sign, val, l, shift;
1456

    
1457
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1458
    if (code == 0) {
1459
        return pred;
1460
    }
1461
    if (code < 0) {
1462
        return 0xffff;
1463
    }
1464

    
1465
    sign = get_bits1(&s->gb);
1466
    shift = fcode - 1;
1467
    val = code;
1468
    if (shift) {
1469
        val = (val - 1) << shift;
1470
        val |= get_bits(&s->gb, shift);
1471
        val++;
1472
    }
1473
    if (sign)
1474
        val = -val;
1475
    val += pred;
1476

    
1477
    /* modulo decoding */
1478
    l= INT_BIT - 5 - shift;
1479
    val = (val<<l)>>l;
1480
    return val;
1481
}
1482

    
1483
static inline int decode_dc(GetBitContext *gb, int component)
1484
{
1485
    int code, diff;
1486

    
1487
    if (component == 0) {
1488
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1489
    } else {
1490
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1491
    }
1492
    if (code < 0){
1493
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1494
        return 0xffff;
1495
    }
1496
    if (code == 0) {
1497
        diff = 0;
1498
    } else {
1499
        diff = get_xbits(gb, code);
1500
    }
1501
    return diff;
1502
}
1503

    
1504
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1505
                               DCTELEM *block,
1506
                               int n)
1507
{
1508
    int level, dc, diff, i, j, run;
1509
    int component;
1510
    RLTable *rl = &rl_mpeg1;
1511
    uint8_t * const scantable= s->intra_scantable.permutated;
1512
    const uint16_t *quant_matrix= s->intra_matrix;
1513
    const int qscale= s->qscale;
1514

    
1515
    /* DC coef */
1516
    component = (n <= 3 ? 0 : n - 4 + 1);
1517
    diff = decode_dc(&s->gb, component);
1518
    if (diff >= 0xffff)
1519
        return -1;
1520
    dc = s->last_dc[component];
1521
    dc += diff;
1522
    s->last_dc[component] = dc;
1523
    block[0] = dc<<3;
1524
    dprintf("dc=%d diff=%d\n", dc, diff);
1525
    i = 0;
1526
    {
1527
        OPEN_READER(re, &s->gb);
1528
        /* now quantify & encode AC coefs */
1529
        for(;;) {
1530
            UPDATE_CACHE(re, &s->gb);
1531
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1532

    
1533
            if(level == 127){
1534
                break;
1535
            } else if(level != 0) {
1536
                i += run;
1537
                j = scantable[i];
1538
                level= (level*qscale*quant_matrix[j])>>4;
1539
                level= (level-1)|1;
1540
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1541
                LAST_SKIP_BITS(re, &s->gb, 1);
1542
            } else {
1543
                /* escape */
1544
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1545
                UPDATE_CACHE(re, &s->gb);
1546
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1547
                if (level == -128) {
1548
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1549
                } else if (level == 0) {
1550
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1551
                }
1552
                i += run;
1553
                j = scantable[i];
1554
                if(level<0){
1555
                    level= -level;
1556
                    level= (level*qscale*quant_matrix[j])>>4;
1557
                    level= (level-1)|1;
1558
                    level= -level;
1559
                }else{
1560
                    level= (level*qscale*quant_matrix[j])>>4;
1561
                    level= (level-1)|1;
1562
                }
1563
            }
1564
            if (i > 63){
1565
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1566
                return -1;
1567
            }
1568

    
1569
            block[j] = level;
1570
        }
1571
        CLOSE_READER(re, &s->gb);
1572
    }
1573
    s->block_last_index[n] = i;
1574
   return 0;
1575
}
1576

    
1577
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1578
                               DCTELEM *block,
1579
                               int n)
1580
{
1581
    int level, i, j, run;
1582
    RLTable *rl = &rl_mpeg1;
1583
    uint8_t * const scantable= s->intra_scantable.permutated;
1584
    const uint16_t *quant_matrix= s->inter_matrix;
1585
    const int qscale= s->qscale;
1586

    
1587
    {
1588
        OPEN_READER(re, &s->gb);
1589
        i = -1;
1590
        /* special case for the first coef. no need to add a second vlc table */
1591
        UPDATE_CACHE(re, &s->gb);
1592
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1593
            level= (3*qscale*quant_matrix[0])>>5;
1594
            level= (level-1)|1;
1595
            if(GET_CACHE(re, &s->gb)&0x40000000)
1596
                level= -level;
1597
            block[0] = level;
1598
            i++;
1599
            SKIP_BITS(re, &s->gb, 2);
1600
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1601
                goto end;
1602
        }
1603

    
1604
        /* now quantify & encode AC coefs */
1605
        for(;;) {
1606
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1607

    
1608
            if(level != 0) {
1609
                i += run;
1610
                j = scantable[i];
1611
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1612
                level= (level-1)|1;
1613
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1614
                SKIP_BITS(re, &s->gb, 1);
1615
            } else {
1616
                /* escape */
1617
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1618
                UPDATE_CACHE(re, &s->gb);
1619
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1620
                if (level == -128) {
1621
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1622
                } else if (level == 0) {
1623
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1624
                }
1625
                i += run;
1626
                j = scantable[i];
1627
                if(level<0){
1628
                    level= -level;
1629
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1630
                    level= (level-1)|1;
1631
                    level= -level;
1632
                }else{
1633
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1634
                    level= (level-1)|1;
1635
                }
1636
            }
1637
            if (i > 63){
1638
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1639
                return -1;
1640
            }
1641

    
1642
            block[j] = level;
1643
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1644
                break;
1645
            UPDATE_CACHE(re, &s->gb);
1646
        }
1647
end:
1648
        LAST_SKIP_BITS(re, &s->gb, 2);
1649
        CLOSE_READER(re, &s->gb);
1650
    }
1651
    s->block_last_index[n] = i;
1652
    return 0;
1653
}
1654

    
1655
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1656
{
1657
    int level, i, j, run;
1658
    RLTable *rl = &rl_mpeg1;
1659
    uint8_t * const scantable= s->intra_scantable.permutated;
1660
    const int qscale= s->qscale;
1661

    
1662
    {
1663
        OPEN_READER(re, &s->gb);
1664
        i = -1;
1665
        /* special case for the first coef. no need to add a second vlc table */
1666
        UPDATE_CACHE(re, &s->gb);
1667
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1668
            level= (3*qscale)>>1;
1669
            level= (level-1)|1;
1670
            if(GET_CACHE(re, &s->gb)&0x40000000)
1671
                level= -level;
1672
            block[0] = level;
1673
            i++;
1674
            SKIP_BITS(re, &s->gb, 2);
1675
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1676
                goto end;
1677
        }
1678

    
1679
        /* now quantify & encode AC coefs */
1680
        for(;;) {
1681
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1682

    
1683
            if(level != 0) {
1684
                i += run;
1685
                j = scantable[i];
1686
                level= ((level*2+1)*qscale)>>1;
1687
                level= (level-1)|1;
1688
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1689
                SKIP_BITS(re, &s->gb, 1);
1690
            } else {
1691
                /* escape */
1692
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1693
                UPDATE_CACHE(re, &s->gb);
1694
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1695
                if (level == -128) {
1696
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1697
                } else if (level == 0) {
1698
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1699
                }
1700
                i += run;
1701
                j = scantable[i];
1702
                if(level<0){
1703
                    level= -level;
1704
                    level= ((level*2+1)*qscale)>>1;
1705
                    level= (level-1)|1;
1706
                    level= -level;
1707
                }else{
1708
                    level= ((level*2+1)*qscale)>>1;
1709
                    level= (level-1)|1;
1710
                }
1711
            }
1712

    
1713
            block[j] = level;
1714
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1715
                break;
1716
            UPDATE_CACHE(re, &s->gb);
1717
        }
1718
end:
1719
        LAST_SKIP_BITS(re, &s->gb, 2);
1720
        CLOSE_READER(re, &s->gb);
1721
    }
1722
    s->block_last_index[n] = i;
1723
    return 0;
1724
}
1725

    
1726

    
1727
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1728
                               DCTELEM *block,
1729
                               int n)
1730
{
1731
    int level, i, j, run;
1732
    RLTable *rl = &rl_mpeg1;
1733
    uint8_t * const scantable= s->intra_scantable.permutated;
1734
    const uint16_t *quant_matrix;
1735
    const int qscale= s->qscale;
1736
    int mismatch;
1737

    
1738
    mismatch = 1;
1739

    
1740
    {
1741
        OPEN_READER(re, &s->gb);
1742
        i = -1;
1743
        if (n < 4)
1744
            quant_matrix = s->inter_matrix;
1745
        else
1746
            quant_matrix = s->chroma_inter_matrix;
1747

    
1748
        /* special case for the first coef. no need to add a second vlc table */
1749
        UPDATE_CACHE(re, &s->gb);
1750
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1751
            level= (3*qscale*quant_matrix[0])>>5;
1752
            if(GET_CACHE(re, &s->gb)&0x40000000)
1753
                level= -level;
1754
            block[0] = level;
1755
            mismatch ^= level;
1756
            i++;
1757
            SKIP_BITS(re, &s->gb, 2);
1758
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1759
                goto end;
1760
        }
1761

    
1762
        /* now quantify & encode AC coefs */
1763
        for(;;) {
1764
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1765

    
1766
            if(level != 0) {
1767
                i += run;
1768
                j = scantable[i];
1769
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1770
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1771
                SKIP_BITS(re, &s->gb, 1);
1772
            } else {
1773
                /* escape */
1774
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1775
                UPDATE_CACHE(re, &s->gb);
1776
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1777

    
1778
                i += run;
1779
                j = scantable[i];
1780
                if(level<0){
1781
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1782
                    level= -level;
1783
                }else{
1784
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1785
                }
1786
            }
1787
            if (i > 63){
1788
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1789
                return -1;
1790
            }
1791

    
1792
            mismatch ^= level;
1793
            block[j] = level;
1794
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1795
                break;
1796
            UPDATE_CACHE(re, &s->gb);
1797
        }
1798
end:
1799
        LAST_SKIP_BITS(re, &s->gb, 2);
1800
        CLOSE_READER(re, &s->gb);
1801
    }
1802
    block[63] ^= (mismatch & 1);
1803

    
1804
    s->block_last_index[n] = i;
1805
    return 0;
1806
}
1807

    
1808
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1809
                               DCTELEM *block,
1810
                               int n)
1811
{
1812
    int level, i, j, run;
1813
    RLTable *rl = &rl_mpeg1;
1814
    uint8_t * const scantable= s->intra_scantable.permutated;
1815
    const int qscale= s->qscale;
1816
    OPEN_READER(re, &s->gb);
1817
    i = -1;
1818

    
1819
    /* special case for the first coef. no need to add a second vlc table */
1820
    UPDATE_CACHE(re, &s->gb);
1821
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1822
        level= (3*qscale)>>1;
1823
        if(GET_CACHE(re, &s->gb)&0x40000000)
1824
            level= -level;
1825
        block[0] = level;
1826
        i++;
1827
        SKIP_BITS(re, &s->gb, 2);
1828
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1829
            goto end;
1830
    }
1831

    
1832
    /* now quantify & encode AC coefs */
1833
    for(;;) {
1834
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1835

    
1836
        if(level != 0) {
1837
            i += run;
1838
            j = scantable[i];
1839
            level= ((level*2+1)*qscale)>>1;
1840
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1841
            SKIP_BITS(re, &s->gb, 1);
1842
        } else {
1843
            /* escape */
1844
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1845
            UPDATE_CACHE(re, &s->gb);
1846
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1847

    
1848
            i += run;
1849
            j = scantable[i];
1850
            if(level<0){
1851
                level= ((-level*2+1)*qscale)>>1;
1852
                level= -level;
1853
            }else{
1854
                level= ((level*2+1)*qscale)>>1;
1855
            }
1856
        }
1857

    
1858
        block[j] = level;
1859
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1860
            break;
1861
        UPDATE_CACHE(re, &s->gb);
1862
    }
1863
end:
1864
    LAST_SKIP_BITS(re, &s->gb, 2);
1865
    CLOSE_READER(re, &s->gb);
1866
    s->block_last_index[n] = i;
1867
    return 0;
1868
}
1869

    
1870

    
1871
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1872
                               DCTELEM *block,
1873
                               int n)
1874
{
1875
    int level, dc, diff, i, j, run;
1876
    int component;
1877
    RLTable *rl;
1878
    uint8_t * const scantable= s->intra_scantable.permutated;
1879
    const uint16_t *quant_matrix;
1880
    const int qscale= s->qscale;
1881
    int mismatch;
1882

    
1883
    /* DC coef */
1884
    if (n < 4){
1885
        quant_matrix = s->intra_matrix;
1886
        component = 0;
1887
    }else{
1888
        quant_matrix = s->chroma_intra_matrix;
1889
        component = (n&1) + 1;
1890
    }
1891
    diff = decode_dc(&s->gb, component);
1892
    if (diff >= 0xffff)
1893
        return -1;
1894
    dc = s->last_dc[component];
1895
    dc += diff;
1896
    s->last_dc[component] = dc;
1897
    block[0] = dc << (3 - s->intra_dc_precision);
1898
    dprintf("dc=%d\n", block[0]);
1899
    mismatch = block[0] ^ 1;
1900
    i = 0;
1901
    if (s->intra_vlc_format)
1902
        rl = &rl_mpeg2;
1903
    else
1904
        rl = &rl_mpeg1;
1905

    
1906
    {
1907
        OPEN_READER(re, &s->gb);
1908
        /* now quantify & encode AC coefs */
1909
        for(;;) {
1910
            UPDATE_CACHE(re, &s->gb);
1911
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1912

    
1913
            if(level == 127){
1914
                break;
1915
            } else if(level != 0) {
1916
                i += run;
1917
                j = scantable[i];
1918
                level= (level*qscale*quant_matrix[j])>>4;
1919
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1920
                LAST_SKIP_BITS(re, &s->gb, 1);
1921
            } else {
1922
                /* escape */
1923
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1924
                UPDATE_CACHE(re, &s->gb);
1925
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1926
                i += run;
1927
                j = scantable[i];
1928
                if(level<0){
1929
                    level= (-level*qscale*quant_matrix[j])>>4;
1930
                    level= -level;
1931
                }else{
1932
                    level= (level*qscale*quant_matrix[j])>>4;
1933
                }
1934
            }
1935
            if (i > 63){
1936
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1937
                return -1;
1938
            }
1939

    
1940
            mismatch^= level;
1941
            block[j] = level;
1942
        }
1943
        CLOSE_READER(re, &s->gb);
1944
    }
1945
    block[63]^= mismatch&1;
1946

    
1947
    s->block_last_index[n] = i;
1948
    return 0;
1949
}
1950

    
1951
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1952
                               DCTELEM *block,
1953
                               int n)
1954
{
1955
    int level, dc, diff, j, run;
1956
    int component;
1957
    RLTable *rl;
1958
    uint8_t * scantable= s->intra_scantable.permutated;
1959
    const uint16_t *quant_matrix;
1960
    const int qscale= s->qscale;
1961

    
1962
    /* DC coef */
1963
    if (n < 4){
1964
        quant_matrix = s->intra_matrix;
1965
        component = 0;
1966
    }else{
1967
        quant_matrix = s->chroma_intra_matrix;
1968
        component = (n&1) + 1;
1969
    }
1970
    diff = decode_dc(&s->gb, component);
1971
    if (diff >= 0xffff)
1972
        return -1;
1973
    dc = s->last_dc[component];
1974
    dc += diff;
1975
    s->last_dc[component] = dc;
1976
    block[0] = dc << (3 - s->intra_dc_precision);
1977
    if (s->intra_vlc_format)
1978
        rl = &rl_mpeg2;
1979
    else
1980
        rl = &rl_mpeg1;
1981

    
1982
    {
1983
        OPEN_READER(re, &s->gb);
1984
        /* now quantify & encode AC coefs */
1985
        for(;;) {
1986
            UPDATE_CACHE(re, &s->gb);
1987
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1988

    
1989
            if(level == 127){
1990
                break;
1991
            } else if(level != 0) {
1992
                scantable += run;
1993
                j = *scantable;
1994
                level= (level*qscale*quant_matrix[j])>>4;
1995
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1996
                LAST_SKIP_BITS(re, &s->gb, 1);
1997
            } else {
1998
                /* escape */
1999
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2000
                UPDATE_CACHE(re, &s->gb);
2001
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2002
                scantable += run;
2003
                j = *scantable;
2004
                if(level<0){
2005
                    level= (-level*qscale*quant_matrix[j])>>4;
2006
                    level= -level;
2007
                }else{
2008
                    level= (level*qscale*quant_matrix[j])>>4;
2009
                }
2010
            }
2011

    
2012
            block[j] = level;
2013
        }
2014
        CLOSE_READER(re, &s->gb);
2015
    }
2016

    
2017
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2018
    return 0;
2019
}
2020

    
2021
typedef struct Mpeg1Context {
2022
    MpegEncContext mpeg_enc_ctx;
2023
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2024
    int repeat_field; /* true if we must repeat the field */
2025
    AVPanScan pan_scan; /** some temporary storage for the panscan */
2026
    int slice_count;
2027
    int swap_uv;//indicate VCR2
2028
    int save_aspect_info;
2029
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2030

    
2031
} Mpeg1Context;
2032

    
2033
static int mpeg_decode_init(AVCodecContext *avctx)
2034
{
2035
    Mpeg1Context *s = avctx->priv_data;
2036
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2037
    int i;
2038

    
2039
    //we need some parmutation to store
2040
    //matrixes, until MPV_common_init()
2041
    //set the real permutatuon
2042
    for(i=0;i<64;i++)
2043
       s2->dsp.idct_permutation[i]=i;
2044

    
2045
    MPV_decode_defaults(s2);
2046

    
2047
    s->mpeg_enc_ctx.avctx= avctx;
2048
    s->mpeg_enc_ctx.flags= avctx->flags;
2049
    s->mpeg_enc_ctx.flags2= avctx->flags2;
2050
    common_init(&s->mpeg_enc_ctx);
2051
    init_vlcs();
2052

    
2053
    s->mpeg_enc_ctx_allocated = 0;
2054
    s->mpeg_enc_ctx.picture_number = 0;
2055
    s->repeat_field = 0;
2056
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2057
    return 0;
2058
}
2059

    
2060
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2061
                                     const uint8_t *new_perm){
2062
    uint16_t temp_matrix[64];
2063
    int i;
2064

    
2065
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2066

    
2067
    for(i=0;i<64;i++){
2068
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2069
    }
2070
}
2071

    
2072
//Call this function when we know all parameters
2073
//it may be called in different places for mpeg1 and mpeg2
2074
static int mpeg_decode_postinit(AVCodecContext *avctx){
2075
    Mpeg1Context *s1 = avctx->priv_data;
2076
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2077
    uint8_t old_permutation[64];
2078

    
2079
    if (
2080
        (s1->mpeg_enc_ctx_allocated == 0)||
2081
        avctx->coded_width  != s->width ||
2082
        avctx->coded_height != s->height||
2083
        s1->save_aspect_info != s->aspect_ratio_info||
2084
        0)
2085
    {
2086

    
2087
        if (s1->mpeg_enc_ctx_allocated) {
2088
            ParseContext pc= s->parse_context;
2089
            s->parse_context.buffer=0;
2090
            MPV_common_end(s);
2091
            s->parse_context= pc;
2092
        }
2093

    
2094
        if( (s->width == 0 )||(s->height == 0))
2095
            return -2;
2096

    
2097
        avcodec_set_dimensions(avctx, s->width, s->height);
2098
        avctx->bit_rate = s->bit_rate;
2099
        s1->save_aspect_info = s->aspect_ratio_info;
2100

    
2101
     //low_delay may be forced, in this case we will have B frames
2102
     //that behave like P frames
2103
        avctx->has_b_frames = !(s->low_delay);
2104

    
2105
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2106
            //mpeg1 fps
2107
            avctx->time_base.den     = frame_rate_tab[s->frame_rate_index].num;
2108
            avctx->time_base.num= frame_rate_tab[s->frame_rate_index].den;
2109
            //mpeg1 aspect
2110
            avctx->sample_aspect_ratio= av_d2q(
2111
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2112

    
2113
        }else{//mpeg2
2114
        //mpeg2 fps
2115
            av_reduce(
2116
                &s->avctx->time_base.den,
2117
                &s->avctx->time_base.num,
2118
                frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2119
                frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2120
                1<<30);
2121
        //mpeg2 aspect
2122
            if(s->aspect_ratio_info > 1){
2123
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2124
                    s->avctx->sample_aspect_ratio=
2125
                        av_div_q(
2126
                         mpeg2_aspect[s->aspect_ratio_info],
2127
                         (AVRational){s->width, s->height}
2128
                         );
2129
                }else{
2130
                    s->avctx->sample_aspect_ratio=
2131
                        av_div_q(
2132
                         mpeg2_aspect[s->aspect_ratio_info],
2133
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2134
                        );
2135
                }
2136
            }else{
2137
                s->avctx->sample_aspect_ratio=
2138
                    mpeg2_aspect[s->aspect_ratio_info];
2139
            }
2140
        }//mpeg2
2141

    
2142
        if(avctx->xvmc_acceleration){
2143
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2144
        }else{
2145
            if(s->chroma_format <  2){
2146
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2147
            }else
2148
            if(s->chroma_format == 2){
2149
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2150
            }else
2151
            if(s->chroma_format >  2){
2152
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2153
            }
2154
        }
2155
        //until then pix_fmt may be changed right after codec init
2156
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2157
            if( avctx->idct_algo == FF_IDCT_AUTO )
2158
                avctx->idct_algo = FF_IDCT_SIMPLE;
2159

    
2160
        //quantization matrixes may need reordering
2161
        //if dct permutation is changed
2162
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2163

    
2164
        if (MPV_common_init(s) < 0)
2165
            return -2;
2166

    
2167
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2168
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2169
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2170
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2171

    
2172
        s1->mpeg_enc_ctx_allocated = 1;
2173
    }
2174
    return 0;
2175
}
2176

    
2177
static int mpeg1_decode_picture(AVCodecContext *avctx,
2178
                                const uint8_t *buf, int buf_size)
2179
{
2180
    Mpeg1Context *s1 = avctx->priv_data;
2181
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2182
    int ref, f_code, vbv_delay;
2183

    
2184
    if(mpeg_decode_postinit(s->avctx) < 0)
2185
       return -2;
2186

    
2187
    init_get_bits(&s->gb, buf, buf_size*8);
2188

    
2189
    ref = get_bits(&s->gb, 10); /* temporal ref */
2190
    s->pict_type = get_bits(&s->gb, 3);
2191
    if(s->pict_type == 0 || s->pict_type > 3)
2192
        return -1;
2193

    
2194
    vbv_delay= get_bits(&s->gb, 16);
2195
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2196
        s->full_pel[0] = get_bits1(&s->gb);
2197
        f_code = get_bits(&s->gb, 3);
2198
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2199
            return -1;
2200
        s->mpeg_f_code[0][0] = f_code;
2201
        s->mpeg_f_code[0][1] = f_code;
2202
    }
2203
    if (s->pict_type == B_TYPE) {
2204
        s->full_pel[1] = get_bits1(&s->gb);
2205
        f_code = get_bits(&s->gb, 3);
2206
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2207
            return -1;
2208
        s->mpeg_f_code[1][0] = f_code;
2209
        s->mpeg_f_code[1][1] = f_code;
2210
    }
2211
    s->current_picture.pict_type= s->pict_type;
2212
    s->current_picture.key_frame= s->pict_type == I_TYPE;
2213

    
2214
    if(avctx->debug & FF_DEBUG_PICT_INFO)
2215
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2216

    
2217
    s->y_dc_scale = 8;
2218
    s->c_dc_scale = 8;
2219
    s->first_slice = 1;
2220
    return 0;
2221
}
2222

    
2223
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2224
{
2225
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2226
    int horiz_size_ext, vert_size_ext;
2227
    int bit_rate_ext;
2228

    
2229
    skip_bits(&s->gb, 1); /* profil and level esc*/
2230
    s->avctx->profile= get_bits(&s->gb, 3);
2231
    s->avctx->level= get_bits(&s->gb, 4);
2232
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2233
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2234
    horiz_size_ext = get_bits(&s->gb, 2);
2235
    vert_size_ext = get_bits(&s->gb, 2);
2236
    s->width |= (horiz_size_ext << 12);
2237
    s->height |= (vert_size_ext << 12);
2238
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2239
    s->bit_rate += (bit_rate_ext << 18) * 400;
2240
    skip_bits1(&s->gb); /* marker */
2241
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2242

    
2243
    s->low_delay = get_bits1(&s->gb);
2244
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2245

    
2246
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2247
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2248

    
2249
    dprintf("sequence extension\n");
2250
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2251
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
2252

    
2253
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2254
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2255
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2256

    
2257
}
2258

    
2259
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2260
{
2261
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2262
    int color_description, w, h;
2263

    
2264
    skip_bits(&s->gb, 3); /* video format */
2265
    color_description= get_bits1(&s->gb);
2266
    if(color_description){
2267
        skip_bits(&s->gb, 8); /* color primaries */
2268
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2269
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2270
    }
2271
    w= get_bits(&s->gb, 14);
2272
    skip_bits(&s->gb, 1); //marker
2273
    h= get_bits(&s->gb, 14);
2274
    skip_bits(&s->gb, 1); //marker
2275

    
2276
    s1->pan_scan.width= 16*w;
2277
    s1->pan_scan.height=16*h;
2278

    
2279
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2280
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2281
}
2282

    
2283
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2284
{
2285
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2286
    int i,nofco;
2287

    
2288
    nofco = 1;
2289
    if(s->progressive_sequence){
2290
        if(s->repeat_first_field){
2291
            nofco++;
2292
            if(s->top_field_first)
2293
                nofco++;
2294
        }
2295
    }else{
2296
        if(s->picture_structure == PICT_FRAME){
2297
            nofco++;
2298
            if(s->repeat_first_field)
2299
                nofco++;
2300
        }
2301
    }
2302
    for(i=0; i<nofco; i++){
2303
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2304
        skip_bits(&s->gb, 1); //marker
2305
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2306
        skip_bits(&s->gb, 1); //marker
2307
    }
2308

    
2309
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2310
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2311
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2312
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2313
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2314
        );
2315
}
2316

    
2317
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2318
{
2319
    int i, v, j;
2320

    
2321
    dprintf("matrix extension\n");
2322

    
2323
    if (get_bits1(&s->gb)) {
2324
        for(i=0;i<64;i++) {
2325
            v = get_bits(&s->gb, 8);
2326
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2327
            s->intra_matrix[j] = v;
2328
            s->chroma_intra_matrix[j] = v;
2329
        }
2330
    }
2331
    if (get_bits1(&s->gb)) {
2332
        for(i=0;i<64;i++) {
2333
            v = get_bits(&s->gb, 8);
2334
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2335
            s->inter_matrix[j] = v;
2336
            s->chroma_inter_matrix[j] = v;
2337
        }
2338
    }
2339
    if (get_bits1(&s->gb)) {
2340
        for(i=0;i<64;i++) {
2341
            v = get_bits(&s->gb, 8);
2342
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2343
            s->chroma_intra_matrix[j] = v;
2344
        }
2345
    }
2346
    if (get_bits1(&s->gb)) {
2347
        for(i=0;i<64;i++) {
2348
            v = get_bits(&s->gb, 8);
2349
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2350
            s->chroma_inter_matrix[j] = v;
2351
        }
2352
    }
2353
}
2354

    
2355
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2356
{
2357
    s->full_pel[0] = s->full_pel[1] = 0;
2358
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2359
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2360
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2361
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2362
    s->intra_dc_precision = get_bits(&s->gb, 2);
2363
    s->picture_structure = get_bits(&s->gb, 2);
2364
    s->top_field_first = get_bits1(&s->gb);
2365
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2366
    s->concealment_motion_vectors = get_bits1(&s->gb);
2367
    s->q_scale_type = get_bits1(&s->gb);
2368
    s->intra_vlc_format = get_bits1(&s->gb);
2369
    s->alternate_scan = get_bits1(&s->gb);
2370
    s->repeat_first_field = get_bits1(&s->gb);
2371
    s->chroma_420_type = get_bits1(&s->gb);
2372
    s->progressive_frame = get_bits1(&s->gb);
2373

    
2374
    if(s->picture_structure == PICT_FRAME)
2375
        s->first_field=0;
2376
    else{
2377
        s->first_field ^= 1;
2378
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2379
    }
2380

    
2381
    if(s->alternate_scan){
2382
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2383
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2384
    }else{
2385
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2386
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2387
    }
2388

    
2389
    /* composite display not parsed */
2390
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2391
    dprintf("picture_structure=%d\n", s->picture_structure);
2392
    dprintf("top field first=%d\n", s->top_field_first);
2393
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2394
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2395
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2396
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2397
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2398
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2399
}
2400

    
2401
static void mpeg_decode_extension(AVCodecContext *avctx,
2402
                                  const uint8_t *buf, int buf_size)
2403
{
2404
    Mpeg1Context *s1 = avctx->priv_data;
2405
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2406
    int ext_type;
2407

    
2408
    init_get_bits(&s->gb, buf, buf_size*8);
2409

    
2410
    ext_type = get_bits(&s->gb, 4);
2411
    switch(ext_type) {
2412
    case 0x1:
2413
        mpeg_decode_sequence_extension(s1);
2414
        break;
2415
    case 0x2:
2416
        mpeg_decode_sequence_display_extension(s1);
2417
        break;
2418
    case 0x3:
2419
        mpeg_decode_quant_matrix_extension(s);
2420
        break;
2421
    case 0x7:
2422
        mpeg_decode_picture_display_extension(s1);
2423
        break;
2424
    case 0x8:
2425
        mpeg_decode_picture_coding_extension(s);
2426
        break;
2427
    }
2428
}
2429

    
2430
static void exchange_uv(MpegEncContext *s){
2431
    short * tmp = s->pblocks[4];
2432
    s->pblocks[4] = s->pblocks[5];
2433
    s->pblocks[5] = tmp;
2434
}
2435

    
2436
static int mpeg_field_start(MpegEncContext *s){
2437
    AVCodecContext *avctx= s->avctx;
2438
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2439

    
2440
    /* start frame decoding */
2441
    if(s->first_field || s->picture_structure==PICT_FRAME){
2442
        if(MPV_frame_start(s, avctx) < 0)
2443
            return -1;
2444

    
2445
        ff_er_frame_start(s);
2446

    
2447
        /* first check if we must repeat the frame */
2448
        s->current_picture_ptr->repeat_pict = 0;
2449
        if (s->repeat_first_field) {
2450
            if (s->progressive_sequence) {
2451
                if (s->top_field_first)
2452
                    s->current_picture_ptr->repeat_pict = 4;
2453
                else
2454
                    s->current_picture_ptr->repeat_pict = 2;
2455
            } else if (s->progressive_frame) {
2456
                s->current_picture_ptr->repeat_pict = 1;
2457
            }
2458
        }
2459

    
2460
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2461
    }else{ //second field
2462
            int i;
2463

    
2464
            if(!s->current_picture_ptr){
2465
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2466
                return -1;
2467
            }
2468

    
2469
            for(i=0; i<4; i++){
2470
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2471
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2472
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2473
                }
2474
            }
2475
    }
2476
#ifdef HAVE_XVMC
2477
// MPV_frame_start will call this function too,
2478
// but we need to call it on every field
2479
    if(s->avctx->xvmc_acceleration)
2480
         XVMC_field_start(s,avctx);
2481
#endif
2482

    
2483
    return 0;
2484
}
2485

    
2486
#define DECODE_SLICE_ERROR -1
2487
#define DECODE_SLICE_OK 0
2488

    
2489
/**
2490
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2491
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2492
 *         DECODE_SLICE_OK if this slice is ok<br>
2493
 */
2494
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2495
                             const uint8_t **buf, int buf_size)
2496
{
2497
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2498
    AVCodecContext *avctx= s->avctx;
2499
    int ret;
2500
    const int field_pic= s->picture_structure != PICT_FRAME;
2501
    const int lowres= s->avctx->lowres;
2502

    
2503
    s->resync_mb_x=
2504
    s->resync_mb_y= -1;
2505

    
2506
    if (mb_y<<field_pic >= s->mb_height){
2507
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2508
        return -1;
2509
    }
2510

    
2511
    init_get_bits(&s->gb, *buf, buf_size*8);
2512

    
2513
    ff_mpeg1_clean_buffers(s);
2514
    s->interlaced_dct = 0;
2515

    
2516
    s->qscale = get_qscale(s);
2517

    
2518
    if(s->qscale == 0){
2519
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2520
        return -1;
2521
    }
2522

    
2523
    /* extra slice info */
2524
    while (get_bits1(&s->gb) != 0) {
2525
        skip_bits(&s->gb, 8);
2526
    }
2527

    
2528
    s->mb_x=0;
2529

    
2530
    for(;;) {
2531
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2532
        if (code < 0){
2533
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2534
            return -1;
2535
        }
2536
        if (code >= 33) {
2537
            if (code == 33) {
2538
                s->mb_x += 33;
2539
            }
2540
            /* otherwise, stuffing, nothing to do */
2541
        } else {
2542
            s->mb_x += code;
2543
            break;
2544
        }
2545
    }
2546

    
2547
    s->resync_mb_x= s->mb_x;
2548
    s->resync_mb_y= s->mb_y= mb_y;
2549
    s->mb_skip_run= 0;
2550
    ff_init_block_index(s);
2551

    
2552
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2553
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2554
             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",
2555
                 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],
2556
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2557
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2558
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2559
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2560
        }
2561
    }
2562

    
2563
    for(;;) {
2564
#ifdef HAVE_XVMC
2565
        //one 1 we memcpy blocks in xvmcvideo
2566
        if(s->avctx->xvmc_acceleration > 1)
2567
            XVMC_init_block(s);//set s->block
2568
#endif
2569

    
2570
        ret = mpeg_decode_mb(s, s->block);
2571
        s->chroma_qscale= s->qscale;
2572

    
2573
        dprintf("ret=%d\n", ret);
2574
        if (ret < 0)
2575
            return -1;
2576

    
2577
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2578
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2579
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2580
            int motion_x, motion_y, dir, i;
2581
            if(field_pic && !s->first_field)
2582
                xy += wrap/2;
2583

    
2584
            for(i=0; i<2; i++){
2585
                for(dir=0; dir<2; dir++){
2586
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2587
                        motion_x = motion_y = 0;
2588
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2589
                        motion_x = s->mv[dir][0][0];
2590
                        motion_y = s->mv[dir][0][1];
2591
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2592
                        motion_x = s->mv[dir][i][0];
2593
                        motion_y = s->mv[dir][i][1];
2594
                    }
2595

    
2596
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2597
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2598
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2599
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2600
                    s->current_picture.ref_index [dir][xy    ]=
2601
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2602
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2603
                }
2604
                xy += wrap;
2605
            }
2606
        }
2607

    
2608
        s->dest[0] += 16 >> lowres;
2609
        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2610
        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2611

    
2612
        MPV_decode_mb(s, s->block);
2613

    
2614
        if (++s->mb_x >= s->mb_width) {
2615
            const int mb_size= 16>>s->avctx->lowres;
2616

    
2617
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2618

    
2619
            s->mb_x = 0;
2620
            s->mb_y++;
2621

    
2622
            if(s->mb_y<<field_pic >= s->mb_height){
2623
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2624
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2625
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2626
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2627

    
2628
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2629
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2630
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2631
                    return -1;
2632
                }else
2633
                    goto eos;
2634
            }
2635

    
2636
            ff_init_block_index(s);
2637
        }
2638

    
2639
        /* skip mb handling */
2640
        if (s->mb_skip_run == -1) {
2641
            /* read again increment */
2642
            s->mb_skip_run = 0;
2643
            for(;;) {
2644
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2645
                if (code < 0){
2646
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2647
                    return -1;
2648
                }
2649
                if (code >= 33) {
2650
                    if (code == 33) {
2651
                        s->mb_skip_run += 33;
2652
                    }else if(code == 35){
2653
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2654
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2655
                            return -1;
2656
                        }
2657
                        goto eos; /* end of slice */
2658
                    }
2659
                    /* otherwise, stuffing, nothing to do */
2660
                } else {
2661
                    s->mb_skip_run += code;
2662
                    break;
2663
                }
2664
            }
2665
        }
2666
    }
2667
eos: // end of slice
2668
    *buf += get_bits_count(&s->gb)/8 - 1;
2669
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2670
    return 0;
2671
}
2672

    
2673
static int slice_decode_thread(AVCodecContext *c, void *arg){
2674
    MpegEncContext *s= arg;
2675
    const uint8_t *buf= s->gb.buffer;
2676
    int mb_y= s->start_mb_y;
2677

    
2678
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2679

    
2680
    for(;;){
2681
        int start_code, ret;
2682

    
2683
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2684
        emms_c();
2685
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2686
//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);
2687
        if(ret < 0){
2688
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2689
                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);
2690
        }else{
2691
            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);
2692
        }
2693

    
2694
        if(s->mb_y == s->end_mb_y)
2695
            return 0;
2696

    
2697
        start_code= -1;
2698
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2699
        mb_y= start_code - SLICE_MIN_START_CODE;
2700
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2701
            return -1;
2702
    }
2703

    
2704
    return 0; //not reached
2705
}
2706

    
2707
/**
2708
 * handles slice ends.
2709
 * @return 1 if it seems to be the last slice of
2710
 */
2711
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2712
{
2713
    Mpeg1Context *s1 = avctx->priv_data;
2714
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2715

    
2716
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2717
        return 0;
2718

    
2719
#ifdef HAVE_XVMC
2720
    if(s->avctx->xvmc_acceleration)
2721
        XVMC_field_end(s);
2722
#endif
2723
    /* end of slice reached */
2724
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2725
        /* end of image */
2726

    
2727
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2728

    
2729
        ff_er_frame_end(s);
2730

    
2731
        MPV_frame_end(s);
2732

    
2733
        if (s->pict_type == B_TYPE || s->low_delay) {
2734
            *pict= *(AVFrame*)s->current_picture_ptr;
2735
            ff_print_debug_info(s, pict);
2736
        } else {
2737
            s->picture_number++;
2738
            /* latency of 1 frame for I and P frames */
2739
            /* XXX: use another variable than picture_number */
2740
            if (s->last_picture_ptr != NULL) {
2741
                *pict= *(AVFrame*)s->last_picture_ptr;
2742
                 ff_print_debug_info(s, pict);
2743
            }
2744
        }
2745

    
2746
        return 1;
2747
    } else {
2748
        return 0;
2749
    }
2750
}
2751

    
2752
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2753
                                 const uint8_t *buf, int buf_size)
2754
{
2755
    Mpeg1Context *s1 = avctx->priv_data;
2756
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2757
    int width,height;
2758
    int i, v, j;
2759

    
2760
    init_get_bits(&s->gb, buf, buf_size*8);
2761

    
2762
    width = get_bits(&s->gb, 12);
2763
    height = get_bits(&s->gb, 12);
2764
    if (width <= 0 || height <= 0 ||
2765
        (width % 2) != 0 || (height % 2) != 0)
2766
        return -1;
2767
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2768
    if (s->aspect_ratio_info == 0)
2769
        return -1;
2770
    s->frame_rate_index = get_bits(&s->gb, 4);
2771
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2772
        return -1;
2773
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2774
    if (get_bits1(&s->gb) == 0) /* marker */
2775
        return -1;
2776
    s->width = width;
2777
    s->height = height;
2778

    
2779
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2780
    skip_bits(&s->gb, 1);
2781

    
2782
    /* get matrix */
2783
    if (get_bits1(&s->gb)) {
2784
        for(i=0;i<64;i++) {
2785
            v = get_bits(&s->gb, 8);
2786
            if(v==0){
2787
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2788
                return -1;
2789
            }
2790
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2791
            s->intra_matrix[j] = v;
2792
            s->chroma_intra_matrix[j] = v;
2793
        }
2794
#ifdef DEBUG
2795
        dprintf("intra matrix present\n");
2796
        for(i=0;i<64;i++)
2797
            dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2798
        dprintf("\n");
2799
#endif
2800
    } else {
2801
        for(i=0;i<64;i++) {
2802
            j = s->dsp.idct_permutation[i];
2803
            v = ff_mpeg1_default_intra_matrix[i];
2804
            s->intra_matrix[j] = v;
2805
            s->chroma_intra_matrix[j] = v;
2806
        }
2807
    }
2808
    if (get_bits1(&s->gb)) {
2809
        for(i=0;i<64;i++) {
2810
            v = get_bits(&s->gb, 8);
2811
            if(v==0){
2812
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2813
                return -1;
2814
            }
2815
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2816
            s->inter_matrix[j] = v;
2817
            s->chroma_inter_matrix[j] = v;
2818
        }
2819
#ifdef DEBUG
2820
        dprintf("non intra matrix present\n");
2821
        for(i=0;i<64;i++)
2822
            dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2823
        dprintf("\n");
2824
#endif
2825
    } else {
2826
        for(i=0;i<64;i++) {
2827
            int j= s->dsp.idct_permutation[i];
2828
            v = ff_mpeg1_default_non_intra_matrix[i];
2829
            s->inter_matrix[j] = v;
2830
            s->chroma_inter_matrix[j] = v;
2831
        }
2832
    }
2833

    
2834
    if(show_bits(&s->gb, 23) != 0){
2835
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2836
        return -1;
2837
    }
2838

    
2839
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2840
    s->progressive_sequence = 1;
2841
    s->progressive_frame = 1;
2842
    s->picture_structure = PICT_FRAME;
2843
    s->frame_pred_frame_dct = 1;
2844
    s->chroma_format = 1;
2845
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2846
    avctx->sub_id = 1; /* indicates mpeg1 */
2847
    s->out_format = FMT_MPEG1;
2848
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2849
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2850

    
2851
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2852
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2853
               s->avctx->rc_buffer_size, s->bit_rate);
2854

    
2855
    return 0;
2856
}
2857

    
2858
static int vcr2_init_sequence(AVCodecContext *avctx)
2859
{
2860
    Mpeg1Context *s1 = avctx->priv_data;
2861
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2862
    int i, v;
2863

    
2864
    /* start new mpeg1 context decoding */
2865
    s->out_format = FMT_MPEG1;
2866
    if (s1->mpeg_enc_ctx_allocated) {
2867
        MPV_common_end(s);
2868
    }
2869
    s->width  = avctx->coded_width;
2870
    s->height = avctx->coded_height;
2871
    avctx->has_b_frames= 0; //true?
2872
    s->low_delay= 1;
2873

    
2874
    if(avctx->xvmc_acceleration){
2875
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2876
    }else{
2877
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2878
    }
2879

    
2880
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2881
        if( avctx->idct_algo == FF_IDCT_AUTO )
2882
            avctx->idct_algo = FF_IDCT_SIMPLE;
2883

    
2884
    if (MPV_common_init(s) < 0)
2885
        return -1;
2886
    exchange_uv(s);//common init reset pblocks, so we swap them here
2887
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2888
    s1->mpeg_enc_ctx_allocated = 1;
2889

    
2890
    for(i=0;i<64;i++) {
2891
        int j= s->dsp.idct_permutation[i];
2892
        v = ff_mpeg1_default_intra_matrix[i];
2893
        s->intra_matrix[j] = v;
2894
        s->chroma_intra_matrix[j] = v;
2895

    
2896
        v = ff_mpeg1_default_non_intra_matrix[i];
2897
        s->inter_matrix[j] = v;
2898
        s->chroma_inter_matrix[j] = v;
2899
    }
2900

    
2901
    s->progressive_sequence = 1;
2902
    s->progressive_frame = 1;
2903
    s->picture_structure = PICT_FRAME;
2904
    s->frame_pred_frame_dct = 1;
2905
    s->chroma_format = 1;
2906
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2907
    avctx->sub_id = 2; /* indicates mpeg2 */
2908
    return 0;
2909
}
2910

    
2911

    
2912
static void mpeg_decode_user_data(AVCodecContext *avctx,
2913
                                  const uint8_t *buf, int buf_size)
2914
{
2915
    const uint8_t *p;
2916
    int len, flags;
2917
    p = buf;
2918
    len = buf_size;
2919

    
2920
    /* we parse the DTG active format information */
2921
    if (len >= 5 &&
2922
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2923
        flags = p[4];
2924
        p += 5;
2925
        len -= 5;
2926
        if (flags & 0x80) {
2927
            /* skip event id */
2928
            if (len < 2)
2929
                return;
2930
            p += 2;
2931
            len -= 2;
2932
        }
2933
        if (flags & 0x40) {
2934
            if (len < 1)
2935
                return;
2936
            avctx->dtg_active_format = p[0] & 0x0f;
2937
        }
2938
    }
2939
}
2940

    
2941
static void mpeg_decode_gop(AVCodecContext *avctx,
2942
                            const uint8_t *buf, int buf_size){
2943
    Mpeg1Context *s1 = avctx->priv_data;
2944
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2945

    
2946
    int drop_frame_flag;
2947
    int time_code_hours, time_code_minutes;
2948
    int time_code_seconds, time_code_pictures;
2949
    int broken_link;
2950

    
2951
    init_get_bits(&s->gb, buf, buf_size*8);
2952

    
2953
    drop_frame_flag = get_bits1(&s->gb);
2954

    
2955
    time_code_hours=get_bits(&s->gb,5);
2956
    time_code_minutes = get_bits(&s->gb,6);
2957
    skip_bits1(&s->gb);//marker bit
2958
    time_code_seconds = get_bits(&s->gb,6);
2959
    time_code_pictures = get_bits(&s->gb,6);
2960

    
2961
    /*broken_link indicate that after editing the
2962
      reference frames of the first B-Frames after GOP I-Frame
2963
      are missing (open gop)*/
2964
    broken_link = get_bits1(&s->gb);
2965

    
2966
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2967
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2968
            time_code_hours, time_code_minutes, time_code_seconds,
2969
            time_code_pictures, broken_link);
2970
}
2971
/**
2972
 * finds the end of the current frame in the bitstream.
2973
 * @return the position of the first byte of the next frame, or -1
2974
 */
2975
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2976
{
2977
    int i;
2978
    uint32_t state= pc->state;
2979

    
2980
    i=0;
2981
    if(!pc->frame_start_found){
2982
        for(i=0; i<buf_size; i++){
2983
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2984
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2985
                i++;
2986
                pc->frame_start_found=1;
2987
                break;
2988
            }
2989
        }
2990
    }
2991

    
2992
    if(pc->frame_start_found){
2993
        /* EOF considered as end of frame */
2994
        if (buf_size == 0)
2995
            return 0;
2996
        for(; i<buf_size; i++){
2997
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2998
            if((state&0xFFFFFF00) == 0x100){
2999
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3000
                    pc->frame_start_found=0;
3001
                    pc->state=-1;
3002
                    return i-3;
3003
                }
3004
            }
3005
        }
3006
    }
3007
    pc->state= state;
3008
    return END_NOT_FOUND;
3009
}
3010

    
3011
/* handle buffering and image synchronisation */
3012
static int mpeg_decode_frame(AVCodecContext *avctx,
3013
                             void *data, int *data_size,
3014
                             uint8_t *buf, int buf_size)
3015
{
3016
    Mpeg1Context *s = avctx->priv_data;
3017
    const uint8_t *buf_end;
3018
    const uint8_t *buf_ptr;
3019
    int ret, start_code, input_size;
3020
    AVFrame *picture = data;
3021
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
3022
    dprintf("fill_buffer\n");
3023

    
3024
    if (buf_size == 0) {
3025
        /* special case for last picture */
3026
        if (s2->low_delay==0 && s2->next_picture_ptr) {
3027
            *picture= *(AVFrame*)s2->next_picture_ptr;
3028
            s2->next_picture_ptr= NULL;
3029

    
3030
            *data_size = sizeof(AVFrame);
3031
        }
3032
        return 0;
3033
    }
3034

    
3035
    if(s2->flags&CODEC_FLAG_TRUNCATED){
3036
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3037

    
3038
        if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3039
            return buf_size;
3040
    }
3041

    
3042
    buf_ptr = buf;
3043
    buf_end = buf + buf_size;
3044

    
3045
#if 0
3046
    if (s->repeat_field % 2 == 1) {
3047
        s->repeat_field++;
3048
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3049
        //        s2->picture_number, s->repeat_field);
3050
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3051
            *data_size = sizeof(AVPicture);
3052
            goto the_end;
3053
        }
3054
    }
3055
#endif
3056

    
3057
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3058
        vcr2_init_sequence(avctx);
3059

    
3060
    s->slice_count= 0;
3061

    
3062
    for(;;) {
3063
        /* find start next code */
3064
        start_code = -1;
3065
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3066
        if (start_code < 0){
3067
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3068
                if(avctx->thread_count > 1){
3069
                    int i;
3070

    
3071
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3072
                    for(i=0; i<s->slice_count; i++)
3073
                        s2->error_count += s2->thread_context[i]->error_count;
3074
                }
3075
                if (slice_end(avctx, picture)) {
3076
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3077
                        *data_size = sizeof(AVPicture);
3078
                }
3079
            }
3080
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3081
        }
3082

    
3083
        input_size = buf_end - buf_ptr;
3084

    
3085
        if(avctx->debug & FF_DEBUG_STARTCODE){
3086
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3087
        }
3088

    
3089
                /* prepare data for next start code */
3090
                switch(start_code) {
3091
                case SEQ_START_CODE:
3092
                    mpeg1_decode_sequence(avctx, buf_ptr,
3093
                                          input_size);
3094
                    break;
3095

    
3096
                case PICTURE_START_CODE:
3097
                    /* we have a complete image : we try to decompress it */
3098
                    mpeg1_decode_picture(avctx,
3099
                                         buf_ptr, input_size);
3100
                    break;
3101
                case EXT_START_CODE:
3102
                    mpeg_decode_extension(avctx,
3103
                                          buf_ptr, input_size);
3104
                    break;
3105
                case USER_START_CODE:
3106
                    mpeg_decode_user_data(avctx,
3107
                                          buf_ptr, input_size);
3108
                    break;
3109
                case GOP_START_CODE:
3110
                    s2->first_field=0;
3111
                    mpeg_decode_gop(avctx,
3112
                                          buf_ptr, input_size);
3113
                    break;
3114
                default:
3115
                    if (start_code >= SLICE_MIN_START_CODE &&
3116
                        start_code <= SLICE_MAX_START_CODE) {
3117
                        int mb_y= start_code - SLICE_MIN_START_CODE;
3118

    
3119
                        if(s2->last_picture_ptr==NULL){
3120
                        /* skip b frames if we dont have reference frames */
3121
                            if(s2->pict_type==B_TYPE) break;
3122
                        /* skip P frames if we dont have reference frame no valid header */
3123
//                            if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3124
                        }
3125
                        /* skip b frames if we are in a hurry */
3126
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3127
                        if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3128
                           ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3129
                           || avctx->skip_frame >= AVDISCARD_ALL)
3130
                            break;
3131
                        /* skip everything if we are in a hurry>=5 */
3132
                        if(avctx->hurry_up>=5) break;
3133

    
3134
                        if (!s->mpeg_enc_ctx_allocated) break;
3135

    
3136
                        if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3137
                            if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3138
                                break;
3139
                        }
3140

    
3141
                        if(s2->first_slice){
3142
                            s2->first_slice=0;
3143
                            if(mpeg_field_start(s2) < 0)
3144
                                return -1;
3145
                        }
3146

    
3147
                        if(avctx->thread_count > 1){
3148
                            int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3149
                            if(threshold <= mb_y){
3150
                                MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3151

    
3152
                                thread_context->start_mb_y= mb_y;
3153
                                thread_context->end_mb_y  = s2->mb_height;
3154
                                if(s->slice_count){
3155
                                    s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3156
                                    ff_update_duplicate_context(thread_context, s2);
3157
                                }
3158
                                init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3159
                                s->slice_count++;
3160
                            }
3161
                            buf_ptr += 2; //FIXME add minimum num of bytes per slice
3162
                        }else{
3163
                            ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3164
                            emms_c();
3165

    
3166
                            if(ret < 0){
3167
                                if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3168
                                    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);
3169
                            }else{
3170
                                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);
3171
                            }
3172
                        }
3173
                    }
3174
                    break;
3175
                }
3176
    }
3177
}
3178

    
3179
static int mpeg_decode_end(AVCodecContext *avctx)
3180
{
3181
    Mpeg1Context *s = avctx->priv_data;
3182

    
3183
    if (s->mpeg_enc_ctx_allocated)
3184
        MPV_common_end(&s->mpeg_enc_ctx);
3185
    return 0;
3186
}
3187

    
3188
AVCodec mpeg1video_decoder = {
3189
    "mpeg1video",
3190
    CODEC_TYPE_VIDEO,
3191
    CODEC_ID_MPEG1VIDEO,
3192
    sizeof(Mpeg1Context),
3193
    mpeg_decode_init,
3194
    NULL,
3195
    mpeg_decode_end,
3196
    mpeg_decode_frame,
3197
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3198
    .flush= ff_mpeg_flush,
3199
};
3200

    
3201
AVCodec mpeg2video_decoder = {
3202
    "mpeg2video",
3203
    CODEC_TYPE_VIDEO,
3204
    CODEC_ID_MPEG2VIDEO,
3205
    sizeof(Mpeg1Context),
3206
    mpeg_decode_init,
3207
    NULL,
3208
    mpeg_decode_end,
3209
    mpeg_decode_frame,
3210
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3211
    .flush= ff_mpeg_flush,
3212
};
3213

    
3214
//legacy decoder
3215
AVCodec mpegvideo_decoder = {
3216
    "mpegvideo",
3217
    CODEC_TYPE_VIDEO,
3218
    CODEC_ID_MPEG2VIDEO,
3219
    sizeof(Mpeg1Context),
3220
    mpeg_decode_init,
3221
    NULL,
3222
    mpeg_decode_end,
3223
    mpeg_decode_frame,
3224
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3225
    .flush= ff_mpeg_flush,
3226
};
3227

    
3228
#ifdef CONFIG_ENCODERS
3229

    
3230
AVCodec mpeg1video_encoder = {
3231
    "mpeg1video",
3232
    CODEC_TYPE_VIDEO,
3233
    CODEC_ID_MPEG1VIDEO,
3234
    sizeof(MpegEncContext),
3235
    encode_init,
3236
    MPV_encode_picture,
3237
    MPV_encode_end,
3238
    .supported_framerates= frame_rate_tab+1,
3239
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3240
    .capabilities= CODEC_CAP_DELAY,
3241
};
3242

    
3243
AVCodec mpeg2video_encoder = {
3244
    "mpeg2video",
3245
    CODEC_TYPE_VIDEO,
3246
    CODEC_ID_MPEG2VIDEO,
3247
    sizeof(MpegEncContext),
3248
    encode_init,
3249
    MPV_encode_picture,
3250
    MPV_encode_end,
3251
    .supported_framerates= frame_rate_tab+1,
3252
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3253
    .capabilities= CODEC_CAP_DELAY,
3254
};
3255
#endif
3256

    
3257
#ifdef HAVE_XVMC
3258
static int mpeg_mc_decode_init(AVCodecContext *avctx){
3259
    Mpeg1Context *s;
3260

    
3261
    if( avctx->thread_count > 1)
3262
        return -1;
3263
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3264
        return -1;
3265
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3266
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3267
    }
3268
    mpeg_decode_init(avctx);
3269
    s = avctx->priv_data;
3270

    
3271
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3272
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3273

    
3274
    return 0;
3275
}
3276

    
3277
AVCodec mpeg_xvmc_decoder = {
3278
    "mpegvideo_xvmc",
3279
    CODEC_TYPE_VIDEO,
3280
    CODEC_ID_MPEG2VIDEO_XVMC,
3281
    sizeof(Mpeg1Context),
3282
    mpeg_mc_decode_init,
3283
    NULL,
3284
    mpeg_decode_end,
3285
    mpeg_decode_frame,
3286
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3287
    .flush= ff_mpeg_flush,
3288
};
3289

    
3290
#endif
3291

    
3292
/* this is ugly i know, but the alternative is too make
3293
   hundreds of vars global and prefix them with ff_mpeg1_
3294
   which is far uglier. */
3295
#include "mdec.c"