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ffmpeg / libavcodec / mpeg12.c @ e9ccdae0

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1
/*
2
 * MPEG-1/2 decoder
3
 * Copyright (c) 2000,2001 Fabrice Bellard
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file
25
 * MPEG-1/2 decoder
26
 */
27

    
28
//#define DEBUG
29
#include "internal.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
33

    
34
#include "mpeg12.h"
35
#include "mpeg12data.h"
36
#include "mpeg12decdata.h"
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#include "bytestream.h"
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#include "vdpau_internal.h"
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#include "xvmc_internal.h"
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#include "thread.h"
41

    
42
//#undef NDEBUG
43
//#include <assert.h>
44

    
45

    
46
#define MV_VLC_BITS 9
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#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
49
#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
51

    
52
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
54
                              int n);
55
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
57
                              int n);
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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
59
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
60
                                        DCTELEM *block,
61
                                        int n);
62
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
64
                                    int n);
65
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
66
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
67
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
68
static void exchange_uv(MpegEncContext *s);
69

    
70
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
71
                                           PIX_FMT_XVMC_MPEG2_IDCT,
72
                                           PIX_FMT_XVMC_MPEG2_MC,
73
                                           PIX_FMT_NONE};
74

    
75
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
76

    
77

    
78
#define INIT_2D_VLC_RL(rl, static_size)\
79
{\
80
    static RL_VLC_ELEM rl_vlc_table[static_size];\
81
    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
82
             &rl.table_vlc[0][1], 4, 2,\
83
             &rl.table_vlc[0][0], 4, 2, static_size);\
84
\
85
    rl.rl_vlc[0]= rl_vlc_table;\
86
    init_2d_vlc_rl(&rl);\
87
}
88

    
89
static void init_2d_vlc_rl(RLTable *rl)
90
{
91
    int i;
92

    
93
    for(i=0; i<rl->vlc.table_size; i++){
94
        int code= rl->vlc.table[i][0];
95
        int len = rl->vlc.table[i][1];
96
        int level, run;
97

    
98
        if(len==0){ // illegal code
99
            run= 65;
100
            level= MAX_LEVEL;
101
        }else if(len<0){ //more bits needed
102
            run= 0;
103
            level= code;
104
        }else{
105
            if(code==rl->n){ //esc
106
                run= 65;
107
                level= 0;
108
            }else if(code==rl->n+1){ //eob
109
                run= 0;
110
                level= 127;
111
            }else{
112
                run=   rl->table_run  [code] + 1;
113
                level= rl->table_level[code];
114
            }
115
        }
116
        rl->rl_vlc[0][i].len= len;
117
        rl->rl_vlc[0][i].level= level;
118
        rl->rl_vlc[0][i].run= run;
119
    }
120
}
121

    
122
void ff_mpeg12_common_init(MpegEncContext *s)
123
{
124

    
125
    s->y_dc_scale_table=
126
    s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
127

    
128
}
129

    
130
void ff_mpeg1_clean_buffers(MpegEncContext *s){
131
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
132
    s->last_dc[1] = s->last_dc[0];
133
    s->last_dc[2] = s->last_dc[0];
134
    memset(s->last_mv, 0, sizeof(s->last_mv));
135
}
136

    
137

    
138
/******************************************/
139
/* decoding */
140

    
141
VLC ff_dc_lum_vlc;
142
VLC ff_dc_chroma_vlc;
143

    
144
static VLC mv_vlc;
145
static VLC mbincr_vlc;
146
static VLC mb_ptype_vlc;
147
static VLC mb_btype_vlc;
148
static VLC mb_pat_vlc;
149

    
150
av_cold void ff_mpeg12_init_vlcs(void)
151
{
152
    static int done = 0;
153

    
154
    if (!done) {
155
        done = 1;
156

    
157
        INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
158
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
159
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
160
        INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
161
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
162
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
163
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
164
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
165
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
166
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
167
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
168
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
169
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
170
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
171
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
172

    
173
        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
174
                 &table_mb_ptype[0][1], 2, 1,
175
                 &table_mb_ptype[0][0], 2, 1, 64);
176
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
177
                 &table_mb_btype[0][1], 2, 1,
178
                 &table_mb_btype[0][0], 2, 1, 64);
179
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
180
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
181

    
182
        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
183
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
184
    }
185
}
186

    
187
static inline int get_dmv(MpegEncContext *s)
188
{
189
    if(get_bits1(&s->gb))
190
        return 1 - (get_bits1(&s->gb) << 1);
191
    else
192
        return 0;
193
}
194

    
195
static inline int get_qscale(MpegEncContext *s)
196
{
197
    int qscale = get_bits(&s->gb, 5);
198
    if (s->q_scale_type) {
199
        return non_linear_qscale[qscale];
200
    } else {
201
        return qscale << 1;
202
    }
203
}
204

    
205
/* motion type (for MPEG-2) */
206
#define MT_FIELD 1
207
#define MT_FRAME 2
208
#define MT_16X8  2
209
#define MT_DMV   3
210

    
211
static int mpeg_decode_mb(MpegEncContext *s,
212
                          DCTELEM block[12][64])
213
{
214
    int i, j, k, cbp, val, mb_type, motion_type;
215
    const int mb_block_count = 4 + (1<< s->chroma_format);
216

    
217
    av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
218

    
219
    assert(s->mb_skipped==0);
220

    
221
    if (s->mb_skip_run-- != 0) {
222
        if (s->pict_type == FF_P_TYPE) {
223
            s->mb_skipped = 1;
224
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
225
        } else {
226
            int mb_type;
227

    
228
            if(s->mb_x)
229
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
230
            else
231
                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
232
            if(IS_INTRA(mb_type))
233
                return -1;
234

    
235
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
236
                mb_type | MB_TYPE_SKIP;
237
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
238

    
239
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
240
                s->mb_skipped = 1;
241
        }
242

    
243
        return 0;
244
    }
245

    
246
    switch(s->pict_type) {
247
    default:
248
    case FF_I_TYPE:
249
        if (get_bits1(&s->gb) == 0) {
250
            if (get_bits1(&s->gb) == 0){
251
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
252
                return -1;
253
            }
254
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
255
        } else {
256
            mb_type = MB_TYPE_INTRA;
257
        }
258
        break;
259
    case FF_P_TYPE:
260
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
261
        if (mb_type < 0){
262
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
263
            return -1;
264
        }
265
        mb_type = ptype2mb_type[ mb_type ];
266
        break;
267
    case FF_B_TYPE:
268
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
269
        if (mb_type < 0){
270
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
271
            return -1;
272
        }
273
        mb_type = btype2mb_type[ mb_type ];
274
        break;
275
    }
276
    av_dlog(s->avctx, "mb_type=%x\n", mb_type);
277
//    motion_type = 0; /* avoid warning */
278
    if (IS_INTRA(mb_type)) {
279
        s->dsp.clear_blocks(s->block[0]);
280

    
281
        if(!s->chroma_y_shift){
282
            s->dsp.clear_blocks(s->block[6]);
283
        }
284

    
285
        /* compute DCT type */
286
        if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
287
            !s->frame_pred_frame_dct) {
288
            s->interlaced_dct = get_bits1(&s->gb);
289
        }
290

    
291
        if (IS_QUANT(mb_type))
292
            s->qscale = get_qscale(s);
293

    
294
        if (s->concealment_motion_vectors) {
295
            /* just parse them */
296
            if (s->picture_structure != PICT_FRAME)
297
                skip_bits1(&s->gb); /* field select */
298

    
299
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
300
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
301
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
302
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
303

    
304
            skip_bits1(&s->gb); /* marker */
305
        }else
306
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
307
        s->mb_intra = 1;
308
        //if 1, we memcpy blocks in xvmcvideo
309
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
310
            ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
311
            if(s->swap_uv){
312
                exchange_uv(s);
313
            }
314
        }
315

    
316
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
317
            if(s->flags2 & CODEC_FLAG2_FAST){
318
                for(i=0;i<6;i++) {
319
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
320
                }
321
            }else{
322
                for(i=0;i<mb_block_count;i++) {
323
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
324
                        return -1;
325
                }
326
            }
327
        } else {
328
            for(i=0;i<6;i++) {
329
                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
330
                    return -1;
331
            }
332
        }
333
    } else {
334
        if (mb_type & MB_TYPE_ZERO_MV){
335
            assert(mb_type & MB_TYPE_CBP);
336

    
337
            s->mv_dir = MV_DIR_FORWARD;
338
            if(s->picture_structure == PICT_FRAME){
339
                if(!s->frame_pred_frame_dct)
340
                    s->interlaced_dct = get_bits1(&s->gb);
341
                s->mv_type = MV_TYPE_16X16;
342
            }else{
343
                s->mv_type = MV_TYPE_FIELD;
344
                mb_type |= MB_TYPE_INTERLACED;
345
                s->field_select[0][0]= s->picture_structure - 1;
346
            }
347

    
348
            if (IS_QUANT(mb_type))
349
                s->qscale = get_qscale(s);
350

    
351
            s->last_mv[0][0][0] = 0;
352
            s->last_mv[0][0][1] = 0;
353
            s->last_mv[0][1][0] = 0;
354
            s->last_mv[0][1][1] = 0;
355
            s->mv[0][0][0] = 0;
356
            s->mv[0][0][1] = 0;
357
        }else{
358
            assert(mb_type & MB_TYPE_L0L1);
359
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
360
            /* get additional motion vector type */
361
            if (s->frame_pred_frame_dct)
362
                motion_type = MT_FRAME;
363
            else{
364
                motion_type = get_bits(&s->gb, 2);
365
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
366
                    s->interlaced_dct = get_bits1(&s->gb);
367
            }
368

    
369
            if (IS_QUANT(mb_type))
370
                s->qscale = get_qscale(s);
371

    
372
            /* motion vectors */
373
            s->mv_dir= (mb_type>>13)&3;
374
            av_dlog(s->avctx, "motion_type=%d\n", motion_type);
375
            switch(motion_type) {
376
            case MT_FRAME: /* or MT_16X8 */
377
                if (s->picture_structure == PICT_FRAME) {
378
                    mb_type |= MB_TYPE_16x16;
379
                    s->mv_type = MV_TYPE_16X16;
380
                    for(i=0;i<2;i++) {
381
                        if (USES_LIST(mb_type, i)) {
382
                            /* MT_FRAME */
383
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
384
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
385
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
386
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
387
                            /* full_pel: only for MPEG-1 */
388
                            if (s->full_pel[i]){
389
                                s->mv[i][0][0] <<= 1;
390
                                s->mv[i][0][1] <<= 1;
391
                            }
392
                        }
393
                    }
394
                } else {
395
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
396
                    s->mv_type = MV_TYPE_16X8;
397
                    for(i=0;i<2;i++) {
398
                        if (USES_LIST(mb_type, i)) {
399
                            /* MT_16X8 */
400
                            for(j=0;j<2;j++) {
401
                                s->field_select[i][j] = get_bits1(&s->gb);
402
                                for(k=0;k<2;k++) {
403
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
404
                                                             s->last_mv[i][j][k]);
405
                                    s->last_mv[i][j][k] = val;
406
                                    s->mv[i][j][k] = val;
407
                                }
408
                            }
409
                        }
410
                    }
411
                }
412
                break;
413
            case MT_FIELD:
414
                s->mv_type = MV_TYPE_FIELD;
415
                if (s->picture_structure == PICT_FRAME) {
416
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
417
                    for(i=0;i<2;i++) {
418
                        if (USES_LIST(mb_type, i)) {
419
                            for(j=0;j<2;j++) {
420
                                s->field_select[i][j] = get_bits1(&s->gb);
421
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
422
                                                         s->last_mv[i][j][0]);
423
                                s->last_mv[i][j][0] = val;
424
                                s->mv[i][j][0] = val;
425
                                av_dlog(s->avctx, "fmx=%d\n", val);
426
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
427
                                                         s->last_mv[i][j][1] >> 1);
428
                                s->last_mv[i][j][1] = val << 1;
429
                                s->mv[i][j][1] = val;
430
                                av_dlog(s->avctx, "fmy=%d\n", val);
431
                            }
432
                        }
433
                    }
434
                } else {
435
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
436
                    for(i=0;i<2;i++) {
437
                        if (USES_LIST(mb_type, i)) {
438
                            s->field_select[i][0] = get_bits1(&s->gb);
439
                            for(k=0;k<2;k++) {
440
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441
                                                         s->last_mv[i][0][k]);
442
                                s->last_mv[i][0][k] = val;
443
                                s->last_mv[i][1][k] = val;
444
                                s->mv[i][0][k] = val;
445
                            }
446
                        }
447
                    }
448
                }
449
                break;
450
            case MT_DMV:
451
                s->mv_type = MV_TYPE_DMV;
452
                for(i=0;i<2;i++) {
453
                    if (USES_LIST(mb_type, i)) {
454
                        int dmx, dmy, mx, my, m;
455
                        const int my_shift= s->picture_structure == PICT_FRAME;
456

    
457
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
458
                                                s->last_mv[i][0][0]);
459
                        s->last_mv[i][0][0] = mx;
460
                        s->last_mv[i][1][0] = mx;
461
                        dmx = get_dmv(s);
462
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
463
                                                s->last_mv[i][0][1] >> my_shift);
464
                        dmy = get_dmv(s);
465

    
466

    
467
                        s->last_mv[i][0][1] = my<<my_shift;
468
                        s->last_mv[i][1][1] = my<<my_shift;
469

    
470
                        s->mv[i][0][0] = mx;
471
                        s->mv[i][0][1] = my;
472
                        s->mv[i][1][0] = mx;//not used
473
                        s->mv[i][1][1] = my;//not used
474

    
475
                        if (s->picture_structure == PICT_FRAME) {
476
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
477

    
478
                            //m = 1 + 2 * s->top_field_first;
479
                            m = s->top_field_first ? 1 : 3;
480

    
481
                            /* top -> top pred */
482
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
483
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
484
                            m = 4 - m;
485
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
486
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
487
                        } else {
488
                            mb_type |= MB_TYPE_16x16;
489

    
490
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
491
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
492
                            if(s->picture_structure == PICT_TOP_FIELD)
493
                                s->mv[i][2][1]--;
494
                            else
495
                                s->mv[i][2][1]++;
496
                        }
497
                    }
498
                }
499
                break;
500
            default:
501
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
502
                return -1;
503
            }
504
        }
505

    
506
        s->mb_intra = 0;
507
        if (HAS_CBP(mb_type)) {
508
            s->dsp.clear_blocks(s->block[0]);
509

    
510
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
511
            if(mb_block_count > 6){
512
                 cbp<<= mb_block_count-6;
513
                 cbp |= get_bits(&s->gb, mb_block_count-6);
514
                 s->dsp.clear_blocks(s->block[6]);
515
            }
516
            if (cbp <= 0){
517
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
518
                return -1;
519
            }
520

    
521
            //if 1, we memcpy blocks in xvmcvideo
522
            if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
523
                ff_xvmc_pack_pblocks(s,cbp);
524
                if(s->swap_uv){
525
                    exchange_uv(s);
526
                }
527
            }
528

    
529
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
530
                if(s->flags2 & CODEC_FLAG2_FAST){
531
                    for(i=0;i<6;i++) {
532
                        if(cbp & 32) {
533
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
534
                        } else {
535
                            s->block_last_index[i] = -1;
536
                        }
537
                        cbp+=cbp;
538
                    }
539
                }else{
540
                    cbp<<= 12-mb_block_count;
541

    
542
                    for(i=0;i<mb_block_count;i++) {
543
                        if ( cbp & (1<<11) ) {
544
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
545
                                return -1;
546
                        } else {
547
                            s->block_last_index[i] = -1;
548
                        }
549
                        cbp+=cbp;
550
                    }
551
                }
552
            } else {
553
                if(s->flags2 & CODEC_FLAG2_FAST){
554
                    for(i=0;i<6;i++) {
555
                        if (cbp & 32) {
556
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
557
                        } else {
558
                            s->block_last_index[i] = -1;
559
                        }
560
                        cbp+=cbp;
561
                    }
562
                }else{
563
                    for(i=0;i<6;i++) {
564
                        if (cbp & 32) {
565
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
566
                                return -1;
567
                        } else {
568
                            s->block_last_index[i] = -1;
569
                        }
570
                        cbp+=cbp;
571
                    }
572
                }
573
            }
574
        }else{
575
            for(i=0;i<12;i++)
576
                s->block_last_index[i] = -1;
577
        }
578
    }
579

    
580
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
581

    
582
    return 0;
583
}
584

    
585
/* as H.263, but only 17 codes */
586
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
587
{
588
    int code, sign, val, l, shift;
589

    
590
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
591
    if (code == 0) {
592
        return pred;
593
    }
594
    if (code < 0) {
595
        return 0xffff;
596
    }
597

    
598
    sign = get_bits1(&s->gb);
599
    shift = fcode - 1;
600
    val = code;
601
    if (shift) {
602
        val = (val - 1) << shift;
603
        val |= get_bits(&s->gb, shift);
604
        val++;
605
    }
606
    if (sign)
607
        val = -val;
608
    val += pred;
609

    
610
    /* modulo decoding */
611
    l= INT_BIT - 5 - shift;
612
    val = (val<<l)>>l;
613
    return val;
614
}
615

    
616
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
617
                               DCTELEM *block,
618
                               int n)
619
{
620
    int level, dc, diff, i, j, run;
621
    int component;
622
    RLTable *rl = &ff_rl_mpeg1;
623
    uint8_t * const scantable= s->intra_scantable.permutated;
624
    const uint16_t *quant_matrix= s->intra_matrix;
625
    const int qscale= s->qscale;
626

    
627
    /* DC coefficient */
628
    component = (n <= 3 ? 0 : n - 4 + 1);
629
    diff = decode_dc(&s->gb, component);
630
    if (diff >= 0xffff)
631
        return -1;
632
    dc = s->last_dc[component];
633
    dc += diff;
634
    s->last_dc[component] = dc;
635
    block[0] = dc*quant_matrix[0];
636
    av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
637
    i = 0;
638
    {
639
        OPEN_READER(re, &s->gb);
640
        /* now quantify & encode AC coefficients */
641
        for(;;) {
642
            UPDATE_CACHE(re, &s->gb);
643
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
644

    
645
            if(level == 127){
646
                break;
647
            } else if(level != 0) {
648
                i += run;
649
                j = scantable[i];
650
                level= (level*qscale*quant_matrix[j])>>4;
651
                level= (level-1)|1;
652
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
653
                LAST_SKIP_BITS(re, &s->gb, 1);
654
            } else {
655
                /* escape */
656
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
657
                UPDATE_CACHE(re, &s->gb);
658
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
659
                if (level == -128) {
660
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
661
                } else if (level == 0) {
662
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
663
                }
664
                i += run;
665
                j = scantable[i];
666
                if(level<0){
667
                    level= -level;
668
                    level= (level*qscale*quant_matrix[j])>>4;
669
                    level= (level-1)|1;
670
                    level= -level;
671
                }else{
672
                    level= (level*qscale*quant_matrix[j])>>4;
673
                    level= (level-1)|1;
674
                }
675
            }
676
            if (i > 63){
677
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
678
                return -1;
679
            }
680

    
681
            block[j] = level;
682
        }
683
        CLOSE_READER(re, &s->gb);
684
    }
685
    s->block_last_index[n] = i;
686
   return 0;
687
}
688

    
689
int ff_mpeg1_decode_block_intra(MpegEncContext *s,
690
                                DCTELEM *block,
691
                                int n)
692
{
693
    return mpeg1_decode_block_intra(s, block, n);
694
}
695

    
696
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
697
                               DCTELEM *block,
698
                               int n)
699
{
700
    int level, i, j, run;
701
    RLTable *rl = &ff_rl_mpeg1;
702
    uint8_t * const scantable= s->intra_scantable.permutated;
703
    const uint16_t *quant_matrix= s->inter_matrix;
704
    const int qscale= s->qscale;
705

    
706
    {
707
        OPEN_READER(re, &s->gb);
708
        i = -1;
709
        // special case for first coefficient, no need to add second VLC table
710
        UPDATE_CACHE(re, &s->gb);
711
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
712
            level= (3*qscale*quant_matrix[0])>>5;
713
            level= (level-1)|1;
714
            if(GET_CACHE(re, &s->gb)&0x40000000)
715
                level= -level;
716
            block[0] = level;
717
            i++;
718
            SKIP_BITS(re, &s->gb, 2);
719
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
720
                goto end;
721
        }
722
        /* now quantify & encode AC coefficients */
723
        for(;;) {
724
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
725

    
726
            if(level != 0) {
727
                i += run;
728
                j = scantable[i];
729
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
730
                level= (level-1)|1;
731
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
732
                SKIP_BITS(re, &s->gb, 1);
733
            } else {
734
                /* escape */
735
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
736
                UPDATE_CACHE(re, &s->gb);
737
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
738
                if (level == -128) {
739
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
740
                } else if (level == 0) {
741
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
742
                }
743
                i += run;
744
                j = scantable[i];
745
                if(level<0){
746
                    level= -level;
747
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
748
                    level= (level-1)|1;
749
                    level= -level;
750
                }else{
751
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
752
                    level= (level-1)|1;
753
                }
754
            }
755
            if (i > 63){
756
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
757
                return -1;
758
            }
759

    
760
            block[j] = level;
761
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
762
                break;
763
            UPDATE_CACHE(re, &s->gb);
764
        }
765
end:
766
        LAST_SKIP_BITS(re, &s->gb, 2);
767
        CLOSE_READER(re, &s->gb);
768
    }
769
    s->block_last_index[n] = i;
770
    return 0;
771
}
772

    
773
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
774
{
775
    int level, i, j, run;
776
    RLTable *rl = &ff_rl_mpeg1;
777
    uint8_t * const scantable= s->intra_scantable.permutated;
778
    const int qscale= s->qscale;
779

    
780
    {
781
        OPEN_READER(re, &s->gb);
782
        i = -1;
783
        // special case for first coefficient, no need to add second VLC table
784
        UPDATE_CACHE(re, &s->gb);
785
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
786
            level= (3*qscale)>>1;
787
            level= (level-1)|1;
788
            if(GET_CACHE(re, &s->gb)&0x40000000)
789
                level= -level;
790
            block[0] = level;
791
            i++;
792
            SKIP_BITS(re, &s->gb, 2);
793
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
794
                goto end;
795
        }
796

    
797
        /* now quantify & encode AC coefficients */
798
        for(;;) {
799
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
800

    
801
            if(level != 0) {
802
                i += run;
803
                j = scantable[i];
804
                level= ((level*2+1)*qscale)>>1;
805
                level= (level-1)|1;
806
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
807
                SKIP_BITS(re, &s->gb, 1);
808
            } else {
809
                /* escape */
810
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
811
                UPDATE_CACHE(re, &s->gb);
812
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
813
                if (level == -128) {
814
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
815
                } else if (level == 0) {
816
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
817
                }
818
                i += run;
819
                j = scantable[i];
820
                if(level<0){
821
                    level= -level;
822
                    level= ((level*2+1)*qscale)>>1;
823
                    level= (level-1)|1;
824
                    level= -level;
825
                }else{
826
                    level= ((level*2+1)*qscale)>>1;
827
                    level= (level-1)|1;
828
                }
829
            }
830

    
831
            block[j] = level;
832
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
833
                break;
834
            UPDATE_CACHE(re, &s->gb);
835
        }
836
end:
837
        LAST_SKIP_BITS(re, &s->gb, 2);
838
        CLOSE_READER(re, &s->gb);
839
    }
840
    s->block_last_index[n] = i;
841
    return 0;
842
}
843

    
844

    
845
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
846
                               DCTELEM *block,
847
                               int n)
848
{
849
    int level, i, j, run;
850
    RLTable *rl = &ff_rl_mpeg1;
851
    uint8_t * const scantable= s->intra_scantable.permutated;
852
    const uint16_t *quant_matrix;
853
    const int qscale= s->qscale;
854
    int mismatch;
855

    
856
    mismatch = 1;
857

    
858
    {
859
        OPEN_READER(re, &s->gb);
860
        i = -1;
861
        if (n < 4)
862
            quant_matrix = s->inter_matrix;
863
        else
864
            quant_matrix = s->chroma_inter_matrix;
865

    
866
        // special case for first coefficient, no need to add second VLC table
867
        UPDATE_CACHE(re, &s->gb);
868
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
869
            level= (3*qscale*quant_matrix[0])>>5;
870
            if(GET_CACHE(re, &s->gb)&0x40000000)
871
                level= -level;
872
            block[0] = level;
873
            mismatch ^= level;
874
            i++;
875
            SKIP_BITS(re, &s->gb, 2);
876
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
877
                goto end;
878
        }
879

    
880
        /* now quantify & encode AC coefficients */
881
        for(;;) {
882
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
883

    
884
            if(level != 0) {
885
                i += run;
886
                j = scantable[i];
887
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
888
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
889
                SKIP_BITS(re, &s->gb, 1);
890
            } else {
891
                /* escape */
892
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
893
                UPDATE_CACHE(re, &s->gb);
894
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
895

    
896
                i += run;
897
                j = scantable[i];
898
                if(level<0){
899
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
900
                    level= -level;
901
                }else{
902
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903
                }
904
            }
905
            if (i > 63){
906
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
907
                return -1;
908
            }
909

    
910
            mismatch ^= level;
911
            block[j] = level;
912
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
913
                break;
914
            UPDATE_CACHE(re, &s->gb);
915
        }
916
end:
917
        LAST_SKIP_BITS(re, &s->gb, 2);
918
        CLOSE_READER(re, &s->gb);
919
    }
920
    block[63] ^= (mismatch & 1);
921

    
922
    s->block_last_index[n] = i;
923
    return 0;
924
}
925

    
926
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
927
                               DCTELEM *block,
928
                               int n)
929
{
930
    int level, i, j, run;
931
    RLTable *rl = &ff_rl_mpeg1;
932
    uint8_t * const scantable= s->intra_scantable.permutated;
933
    const int qscale= s->qscale;
934
    OPEN_READER(re, &s->gb);
935
    i = -1;
936

    
937
    // special case for first coefficient, no need to add second VLC table
938
    UPDATE_CACHE(re, &s->gb);
939
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
940
        level= (3*qscale)>>1;
941
        if(GET_CACHE(re, &s->gb)&0x40000000)
942
            level= -level;
943
        block[0] = level;
944
        i++;
945
        SKIP_BITS(re, &s->gb, 2);
946
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
947
            goto end;
948
    }
949

    
950
    /* now quantify & encode AC coefficients */
951
    for(;;) {
952
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
953

    
954
        if(level != 0) {
955
            i += run;
956
            j = scantable[i];
957
            level= ((level*2+1)*qscale)>>1;
958
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
959
            SKIP_BITS(re, &s->gb, 1);
960
        } else {
961
            /* escape */
962
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
963
            UPDATE_CACHE(re, &s->gb);
964
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
965

    
966
            i += run;
967
            j = scantable[i];
968
            if(level<0){
969
                level= ((-level*2+1)*qscale)>>1;
970
                level= -level;
971
            }else{
972
                level= ((level*2+1)*qscale)>>1;
973
            }
974
        }
975

    
976
        block[j] = level;
977
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
978
            break;
979
        UPDATE_CACHE(re, &s->gb);
980
    }
981
end:
982
    LAST_SKIP_BITS(re, &s->gb, 2);
983
    CLOSE_READER(re, &s->gb);
984
    s->block_last_index[n] = i;
985
    return 0;
986
}
987

    
988

    
989
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
990
                               DCTELEM *block,
991
                               int n)
992
{
993
    int level, dc, diff, i, j, run;
994
    int component;
995
    RLTable *rl;
996
    uint8_t * const scantable= s->intra_scantable.permutated;
997
    const uint16_t *quant_matrix;
998
    const int qscale= s->qscale;
999
    int mismatch;
1000

    
1001
    /* DC coefficient */
1002
    if (n < 4){
1003
        quant_matrix = s->intra_matrix;
1004
        component = 0;
1005
    }else{
1006
        quant_matrix = s->chroma_intra_matrix;
1007
        component = (n&1) + 1;
1008
    }
1009
    diff = decode_dc(&s->gb, component);
1010
    if (diff >= 0xffff)
1011
        return -1;
1012
    dc = s->last_dc[component];
1013
    dc += diff;
1014
    s->last_dc[component] = dc;
1015
    block[0] = dc << (3 - s->intra_dc_precision);
1016
    av_dlog(s->avctx, "dc=%d\n", block[0]);
1017
    mismatch = block[0] ^ 1;
1018
    i = 0;
1019
    if (s->intra_vlc_format)
1020
        rl = &ff_rl_mpeg2;
1021
    else
1022
        rl = &ff_rl_mpeg1;
1023

    
1024
    {
1025
        OPEN_READER(re, &s->gb);
1026
        /* now quantify & encode AC coefficients */
1027
        for(;;) {
1028
            UPDATE_CACHE(re, &s->gb);
1029
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1030

    
1031
            if(level == 127){
1032
                break;
1033
            } else if(level != 0) {
1034
                i += run;
1035
                j = scantable[i];
1036
                level= (level*qscale*quant_matrix[j])>>4;
1037
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1038
                LAST_SKIP_BITS(re, &s->gb, 1);
1039
            } else {
1040
                /* escape */
1041
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1042
                UPDATE_CACHE(re, &s->gb);
1043
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1044
                i += run;
1045
                j = scantable[i];
1046
                if(level<0){
1047
                    level= (-level*qscale*quant_matrix[j])>>4;
1048
                    level= -level;
1049
                }else{
1050
                    level= (level*qscale*quant_matrix[j])>>4;
1051
                }
1052
            }
1053
            if (i > 63){
1054
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1055
                return -1;
1056
            }
1057

    
1058
            mismatch^= level;
1059
            block[j] = level;
1060
        }
1061
        CLOSE_READER(re, &s->gb);
1062
    }
1063
    block[63]^= mismatch&1;
1064

    
1065
    s->block_last_index[n] = i;
1066
    return 0;
1067
}
1068

    
1069
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1070
                               DCTELEM *block,
1071
                               int n)
1072
{
1073
    int level, dc, diff, j, run;
1074
    int component;
1075
    RLTable *rl;
1076
    uint8_t * scantable= s->intra_scantable.permutated;
1077
    const uint16_t *quant_matrix;
1078
    const int qscale= s->qscale;
1079

    
1080
    /* DC coefficient */
1081
    if (n < 4){
1082
        quant_matrix = s->intra_matrix;
1083
        component = 0;
1084
    }else{
1085
        quant_matrix = s->chroma_intra_matrix;
1086
        component = (n&1) + 1;
1087
    }
1088
    diff = decode_dc(&s->gb, component);
1089
    if (diff >= 0xffff)
1090
        return -1;
1091
    dc = s->last_dc[component];
1092
    dc += diff;
1093
    s->last_dc[component] = dc;
1094
    block[0] = dc << (3 - s->intra_dc_precision);
1095
    if (s->intra_vlc_format)
1096
        rl = &ff_rl_mpeg2;
1097
    else
1098
        rl = &ff_rl_mpeg1;
1099

    
1100
    {
1101
        OPEN_READER(re, &s->gb);
1102
        /* now quantify & encode AC coefficients */
1103
        for(;;) {
1104
            UPDATE_CACHE(re, &s->gb);
1105
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1106

    
1107
            if(level == 127){
1108
                break;
1109
            } else if(level != 0) {
1110
                scantable += run;
1111
                j = *scantable;
1112
                level= (level*qscale*quant_matrix[j])>>4;
1113
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1114
                LAST_SKIP_BITS(re, &s->gb, 1);
1115
            } else {
1116
                /* escape */
1117
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1118
                UPDATE_CACHE(re, &s->gb);
1119
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1120
                scantable += run;
1121
                j = *scantable;
1122
                if(level<0){
1123
                    level= (-level*qscale*quant_matrix[j])>>4;
1124
                    level= -level;
1125
                }else{
1126
                    level= (level*qscale*quant_matrix[j])>>4;
1127
                }
1128
            }
1129

    
1130
            block[j] = level;
1131
        }
1132
        CLOSE_READER(re, &s->gb);
1133
    }
1134

    
1135
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1136
    return 0;
1137
}
1138

    
1139
typedef struct Mpeg1Context {
1140
    MpegEncContext mpeg_enc_ctx;
1141
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1142
    int repeat_field; /* true if we must repeat the field */
1143
    AVPanScan pan_scan;              /**< some temporary storage for the panscan */
1144
    int slice_count;
1145
    int swap_uv;//indicate VCR2
1146
    int save_aspect_info;
1147
    int save_width, save_height, save_progressive_seq;
1148
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1149
    int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1150
} Mpeg1Context;
1151

    
1152
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1153
{
1154
    Mpeg1Context *s = avctx->priv_data;
1155
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1156
    int i;
1157

    
1158
    /* we need some permutation to store matrices,
1159
     * until MPV_common_init() sets the real permutation. */
1160
    for(i=0;i<64;i++)
1161
       s2->dsp.idct_permutation[i]=i;
1162

    
1163
    MPV_decode_defaults(s2);
1164

    
1165
    s->mpeg_enc_ctx.avctx= avctx;
1166
    s->mpeg_enc_ctx.flags= avctx->flags;
1167
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1168
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1169
    ff_mpeg12_init_vlcs();
1170

    
1171
    s->mpeg_enc_ctx_allocated = 0;
1172
    s->mpeg_enc_ctx.picture_number = 0;
1173
    s->repeat_field = 0;
1174
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1175
    avctx->color_range= AVCOL_RANGE_MPEG;
1176
    if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1177
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1178
    else
1179
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1180
    return 0;
1181
}
1182

    
1183
static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1184
{
1185
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1186
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1187
    int err;
1188

    
1189
    if(avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1190
        return 0;
1191

    
1192
    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1193
    if(err) return err;
1194

    
1195
    if(!ctx->mpeg_enc_ctx_allocated)
1196
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1197

    
1198
    if(!(s->pict_type == FF_B_TYPE || s->low_delay))
1199
        s->picture_number++;
1200

    
1201
    return 0;
1202
}
1203

    
1204
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1205
                                     const uint8_t *new_perm){
1206
    uint16_t temp_matrix[64];
1207
    int i;
1208

    
1209
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1210

    
1211
    for(i=0;i<64;i++){
1212
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1213
    }
1214
}
1215

    
1216
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1217
    Mpeg1Context *s1 = avctx->priv_data;
1218
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1219

    
1220
    if(avctx->xvmc_acceleration)
1221
        return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1222
    else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1223
        if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1224
            return PIX_FMT_VDPAU_MPEG1;
1225
        else
1226
            return PIX_FMT_VDPAU_MPEG2;
1227
    }else{
1228
        if(s->chroma_format <  2)
1229
            return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1230
        else if(s->chroma_format == 2)
1231
            return PIX_FMT_YUV422P;
1232
        else
1233
            return PIX_FMT_YUV444P;
1234
    }
1235
}
1236

    
1237
/* Call this function when we know all parameters.
1238
 * It may be called in different places for MPEG-1 and MPEG-2. */
1239
static int mpeg_decode_postinit(AVCodecContext *avctx){
1240
    Mpeg1Context *s1 = avctx->priv_data;
1241
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1242
    uint8_t old_permutation[64];
1243

    
1244
    if (
1245
        (s1->mpeg_enc_ctx_allocated == 0)||
1246
        avctx->coded_width  != s->width ||
1247
        avctx->coded_height != s->height||
1248
        s1->save_width != s->width ||
1249
        s1->save_height != s->height ||
1250
        s1->save_aspect_info != s->aspect_ratio_info||
1251
        s1->save_progressive_seq != s->progressive_sequence ||
1252
        0)
1253
    {
1254

    
1255
        if (s1->mpeg_enc_ctx_allocated) {
1256
            ParseContext pc= s->parse_context;
1257
            s->parse_context.buffer=0;
1258
            MPV_common_end(s);
1259
            s->parse_context= pc;
1260
        }
1261

    
1262
        if( (s->width == 0 )||(s->height == 0))
1263
            return -2;
1264

    
1265
        avcodec_set_dimensions(avctx, s->width, s->height);
1266
        avctx->bit_rate = s->bit_rate;
1267
        s1->save_aspect_info = s->aspect_ratio_info;
1268
        s1->save_width = s->width;
1269
        s1->save_height = s->height;
1270
        s1->save_progressive_seq = s->progressive_sequence;
1271

    
1272
        /* low_delay may be forced, in this case we will have B-frames
1273
         * that behave like P-frames. */
1274
        avctx->has_b_frames = !(s->low_delay);
1275

    
1276
        assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1277
        if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1278
            //MPEG-1 fps
1279
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1280
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1281
            //MPEG-1 aspect
1282
            avctx->sample_aspect_ratio= av_d2q(
1283
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1284
            avctx->ticks_per_frame=1;
1285
        }else{//MPEG-2
1286
        //MPEG-2 fps
1287
            av_reduce(
1288
                &s->avctx->time_base.den,
1289
                &s->avctx->time_base.num,
1290
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1291
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1292
                1<<30);
1293
            avctx->ticks_per_frame=2;
1294
        //MPEG-2 aspect
1295
            if(s->aspect_ratio_info > 1){
1296
                AVRational dar=
1297
                    av_mul_q(
1298
                        av_div_q(
1299
                            ff_mpeg2_aspect[s->aspect_ratio_info],
1300
                            (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1301
                        ),
1302
                        (AVRational){s->width, s->height});
1303

    
1304
                //we ignore the spec here and guess a bit as reality does not match the spec, see for example
1305
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1306
                //issue1613, 621, 562
1307
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0)
1308
                   || (av_cmp_q(dar,(AVRational){4,3})&&av_cmp_q(dar,(AVRational){16,9}))){
1309
                    s->avctx->sample_aspect_ratio=
1310
                        av_div_q(
1311
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1312
                         (AVRational){s->width, s->height}
1313
                         );
1314
                }else{
1315
                    s->avctx->sample_aspect_ratio=
1316
                        av_div_q(
1317
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1318
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1319
                        );
1320
//issue1613 4/3 16/9 -> 16/9
1321
//res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1322
//widescreen-issue562.mpg 4/3 16/9 -> 16/9
1323
//                    s->avctx->sample_aspect_ratio= av_mul_q(s->avctx->sample_aspect_ratio, (AVRational){s->width, s->height});
1324
//av_log(NULL, AV_LOG_ERROR, "A %d/%d\n",ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1325
//av_log(NULL, AV_LOG_ERROR, "B %d/%d\n",s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
1326
                }
1327
            }else{
1328
                s->avctx->sample_aspect_ratio=
1329
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1330
            }
1331
        }//MPEG-2
1332

    
1333
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1334
        avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1335
        //until then pix_fmt may be changed right after codec init
1336
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1337
            avctx->hwaccel ||
1338
            s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1339
            if( avctx->idct_algo == FF_IDCT_AUTO )
1340
                avctx->idct_algo = FF_IDCT_SIMPLE;
1341

    
1342
        /* Quantization matrices may need reordering
1343
         * if DCT permutation is changed. */
1344
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1345

    
1346
        if (MPV_common_init(s) < 0)
1347
            return -2;
1348

    
1349
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1350
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1351
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1352
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1353

    
1354
        s1->mpeg_enc_ctx_allocated = 1;
1355
    }
1356
    return 0;
1357
}
1358

    
1359
static int mpeg1_decode_picture(AVCodecContext *avctx,
1360
                                const uint8_t *buf, int buf_size)
1361
{
1362
    Mpeg1Context *s1 = avctx->priv_data;
1363
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1364
    int ref, f_code, vbv_delay;
1365

    
1366
    init_get_bits(&s->gb, buf, buf_size*8);
1367

    
1368
    ref = get_bits(&s->gb, 10); /* temporal ref */
1369
    s->pict_type = get_bits(&s->gb, 3);
1370
    if(s->pict_type == 0 || s->pict_type > 3)
1371
        return -1;
1372

    
1373
    vbv_delay= get_bits(&s->gb, 16);
1374
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1375
        s->full_pel[0] = get_bits1(&s->gb);
1376
        f_code = get_bits(&s->gb, 3);
1377
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1378
            return -1;
1379
        s->mpeg_f_code[0][0] = f_code;
1380
        s->mpeg_f_code[0][1] = f_code;
1381
    }
1382
    if (s->pict_type == FF_B_TYPE) {
1383
        s->full_pel[1] = get_bits1(&s->gb);
1384
        f_code = get_bits(&s->gb, 3);
1385
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1386
            return -1;
1387
        s->mpeg_f_code[1][0] = f_code;
1388
        s->mpeg_f_code[1][1] = f_code;
1389
    }
1390
    s->current_picture.pict_type= s->pict_type;
1391
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1392

    
1393
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1394
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1395

    
1396
    s->y_dc_scale = 8;
1397
    s->c_dc_scale = 8;
1398
    return 0;
1399
}
1400

    
1401
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1402
{
1403
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1404
    int horiz_size_ext, vert_size_ext;
1405
    int bit_rate_ext;
1406

    
1407
    skip_bits(&s->gb, 1); /* profile and level esc*/
1408
    s->avctx->profile= get_bits(&s->gb, 3);
1409
    s->avctx->level= get_bits(&s->gb, 4);
1410
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1411
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1412
    horiz_size_ext = get_bits(&s->gb, 2);
1413
    vert_size_ext = get_bits(&s->gb, 2);
1414
    s->width |= (horiz_size_ext << 12);
1415
    s->height |= (vert_size_ext << 12);
1416
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1417
    s->bit_rate += (bit_rate_ext << 18) * 400;
1418
    skip_bits1(&s->gb); /* marker */
1419
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1420

    
1421
    s->low_delay = get_bits1(&s->gb);
1422
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1423

    
1424
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1425
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1426

    
1427
    av_dlog(s->avctx, "sequence extension\n");
1428
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1429
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1430

    
1431
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1432
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1433
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1434

    
1435
}
1436

    
1437
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1438
{
1439
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1440
    int color_description, w, h;
1441

    
1442
    skip_bits(&s->gb, 3); /* video format */
1443
    color_description= get_bits1(&s->gb);
1444
    if(color_description){
1445
        s->avctx->color_primaries= get_bits(&s->gb, 8);
1446
        s->avctx->color_trc      = get_bits(&s->gb, 8);
1447
        s->avctx->colorspace     = get_bits(&s->gb, 8);
1448
    }
1449
    w= get_bits(&s->gb, 14);
1450
    skip_bits(&s->gb, 1); //marker
1451
    h= get_bits(&s->gb, 14);
1452
    // remaining 3 bits are zero padding
1453

    
1454
    s1->pan_scan.width= 16*w;
1455
    s1->pan_scan.height=16*h;
1456

    
1457
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1458
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1459
}
1460

    
1461
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1462
{
1463
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1464
    int i,nofco;
1465

    
1466
    nofco = 1;
1467
    if(s->progressive_sequence){
1468
        if(s->repeat_first_field){
1469
            nofco++;
1470
            if(s->top_field_first)
1471
                nofco++;
1472
        }
1473
    }else{
1474
        if(s->picture_structure == PICT_FRAME){
1475
            nofco++;
1476
            if(s->repeat_first_field)
1477
                nofco++;
1478
        }
1479
    }
1480
    for(i=0; i<nofco; i++){
1481
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1482
        skip_bits(&s->gb, 1); //marker
1483
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1484
        skip_bits(&s->gb, 1); //marker
1485
    }
1486

    
1487
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1488
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1489
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1490
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1491
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1492
        );
1493
}
1494

    
1495
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1496
    int i;
1497

    
1498
    for(i=0; i<64; i++) {
1499
        int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1500
        int v = get_bits(&s->gb, 8);
1501
        if(v==0){
1502
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1503
            return -1;
1504
        }
1505
        if(intra && i==0 && v!=8){
1506
            av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1507
            v= 8; // needed by pink.mpg / issue1046
1508
        }
1509
        matrix0[j] = v;
1510
        if(matrix1)
1511
            matrix1[j] = v;
1512
    }
1513
    return 0;
1514
}
1515

    
1516
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1517
{
1518
    av_dlog(s->avctx, "matrix extension\n");
1519

    
1520
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1521
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1522
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1523
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1524
}
1525

    
1526
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1527
{
1528
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1529

    
1530
    s->full_pel[0] = s->full_pel[1] = 0;
1531
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1532
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1533
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1534
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1535
    if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1536
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1537
        if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1538
            if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1539
                s->pict_type= FF_I_TYPE;
1540
            else
1541
                s->pict_type= FF_P_TYPE;
1542
        }else
1543
            s->pict_type= FF_B_TYPE;
1544
        s->current_picture.pict_type= s->pict_type;
1545
        s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1546
    }
1547
    s->intra_dc_precision = get_bits(&s->gb, 2);
1548
    s->picture_structure = get_bits(&s->gb, 2);
1549
    s->top_field_first = get_bits1(&s->gb);
1550
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1551
    s->concealment_motion_vectors = get_bits1(&s->gb);
1552
    s->q_scale_type = get_bits1(&s->gb);
1553
    s->intra_vlc_format = get_bits1(&s->gb);
1554
    s->alternate_scan = get_bits1(&s->gb);
1555
    s->repeat_first_field = get_bits1(&s->gb);
1556
    s->chroma_420_type = get_bits1(&s->gb);
1557
    s->progressive_frame = get_bits1(&s->gb);
1558

    
1559
    if(s->progressive_sequence && !s->progressive_frame){
1560
        s->progressive_frame= 1;
1561
        av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1562
    }
1563

    
1564
    if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1565
        av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1566
        s->picture_structure= PICT_FRAME;
1567
    }
1568

    
1569
    if(s->progressive_sequence && !s->frame_pred_frame_dct){
1570
        av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1571
        s->frame_pred_frame_dct= 1;
1572
    }
1573

    
1574
    if(s->picture_structure == PICT_FRAME){
1575
        s->first_field=0;
1576
        s->v_edge_pos= 16*s->mb_height;
1577
    }else{
1578
        s->first_field ^= 1;
1579
        s->v_edge_pos=  8*s->mb_height;
1580
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1581
    }
1582

    
1583
    if(s->alternate_scan){
1584
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1585
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1586
    }else{
1587
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1588
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1589
    }
1590

    
1591
    /* composite display not parsed */
1592
    av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1593
    av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1594
    av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1595
    av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1596
    av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1597
    av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1598
    av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1599
    av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1600
    av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1601
}
1602

    
1603
static void exchange_uv(MpegEncContext *s){
1604
    DCTELEM (*tmp)[64];
1605

    
1606
    tmp           = s->pblocks[4];
1607
    s->pblocks[4] = s->pblocks[5];
1608
    s->pblocks[5] = tmp;
1609
}
1610

    
1611
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1612
    AVCodecContext *avctx= s->avctx;
1613
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1614

    
1615
    /* start frame decoding */
1616
    if(s->first_field || s->picture_structure==PICT_FRAME){
1617
        if(MPV_frame_start(s, avctx) < 0)
1618
            return -1;
1619

    
1620
        ff_er_frame_start(s);
1621

    
1622
        /* first check if we must repeat the frame */
1623
        s->current_picture_ptr->repeat_pict = 0;
1624
        if (s->repeat_first_field) {
1625
            if (s->progressive_sequence) {
1626
                if (s->top_field_first)
1627
                    s->current_picture_ptr->repeat_pict = 4;
1628
                else
1629
                    s->current_picture_ptr->repeat_pict = 2;
1630
            } else if (s->progressive_frame) {
1631
                s->current_picture_ptr->repeat_pict = 1;
1632
            }
1633
        }
1634

    
1635
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1636

    
1637
        if (HAVE_PTHREADS && avctx->active_thread_type&FF_THREAD_FRAME)
1638
            ff_thread_finish_setup(avctx);
1639
    }else{ //second field
1640
            int i;
1641

    
1642
            if(!s->current_picture_ptr){
1643
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1644
                return -1;
1645
            }
1646

    
1647
            for(i=0; i<4; i++){
1648
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1649
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1650
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1651
                }
1652
            }
1653
    }
1654

    
1655
    if (avctx->hwaccel) {
1656
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1657
            return -1;
1658
    }
1659

    
1660
// MPV_frame_start will call this function too,
1661
// but we need to call it on every field
1662
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1663
        if(ff_xvmc_field_start(s,avctx) < 0)
1664
            return -1;
1665

    
1666
    return 0;
1667
}
1668

    
1669
#define DECODE_SLICE_ERROR -1
1670
#define DECODE_SLICE_OK 0
1671

    
1672
/**
1673
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1674
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1675
 *         DECODE_SLICE_OK if this slice is ok<br>
1676
 */
1677
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1678
                             const uint8_t **buf, int buf_size)
1679
{
1680
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1681
    AVCodecContext *avctx= s->avctx;
1682
    const int field_pic= s->picture_structure != PICT_FRAME;
1683
    const int lowres= s->avctx->lowres;
1684

    
1685
    s->resync_mb_x=
1686
    s->resync_mb_y= -1;
1687

    
1688
    assert(mb_y < s->mb_height);
1689

    
1690
    init_get_bits(&s->gb, *buf, buf_size*8);
1691

    
1692
    ff_mpeg1_clean_buffers(s);
1693
    s->interlaced_dct = 0;
1694

    
1695
    s->qscale = get_qscale(s);
1696

    
1697
    if(s->qscale == 0){
1698
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1699
        return -1;
1700
    }
1701

    
1702
    /* extra slice info */
1703
    while (get_bits1(&s->gb) != 0) {
1704
        skip_bits(&s->gb, 8);
1705
    }
1706

    
1707
    s->mb_x=0;
1708

    
1709
    if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1710
        skip_bits1(&s->gb);
1711
    }else{
1712
        for(;;) {
1713
            int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1714
            if (code < 0){
1715
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1716
                return -1;
1717
            }
1718
            if (code >= 33) {
1719
                if (code == 33) {
1720
                    s->mb_x += 33;
1721
                }
1722
                /* otherwise, stuffing, nothing to do */
1723
            } else {
1724
                s->mb_x += code;
1725
                break;
1726
            }
1727
        }
1728
    }
1729

    
1730
    if(s->mb_x >= (unsigned)s->mb_width){
1731
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1732
        return -1;
1733
    }
1734

    
1735
    if (avctx->hwaccel) {
1736
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1737
        int start_code = -1;
1738
        buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1739
        if (buf_end < *buf + buf_size)
1740
            buf_end -= 4;
1741
        s->mb_y = mb_y;
1742
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1743
            return DECODE_SLICE_ERROR;
1744
        *buf = buf_end;
1745
        return DECODE_SLICE_OK;
1746
    }
1747

    
1748
    s->resync_mb_x= s->mb_x;
1749
    s->resync_mb_y= s->mb_y= mb_y;
1750
    s->mb_skip_run= 0;
1751
    ff_init_block_index(s);
1752

    
1753
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1754
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1755
             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",
1756
                 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],
1757
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1758
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1759
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1760
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1761
        }
1762
    }
1763

    
1764
    for(;;) {
1765
        //If 1, we memcpy blocks in xvmcvideo.
1766
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1767
            ff_xvmc_init_block(s);//set s->block
1768

    
1769
        if(mpeg_decode_mb(s, s->block) < 0)
1770
            return -1;
1771

    
1772
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1773
            const int wrap = s->b8_stride;
1774
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1775
            int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1776
            int motion_x, motion_y, dir, i;
1777

    
1778
            for(i=0; i<2; i++){
1779
                for(dir=0; dir<2; dir++){
1780
                    if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1781
                        motion_x = motion_y = 0;
1782
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1783
                        motion_x = s->mv[dir][0][0];
1784
                        motion_y = s->mv[dir][0][1];
1785
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1786
                        motion_x = s->mv[dir][i][0];
1787
                        motion_y = s->mv[dir][i][1];
1788
                    }
1789

    
1790
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1791
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1792
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1793
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1794
                    s->current_picture.ref_index [dir][b8_xy    ]=
1795
                    s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1796
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1797
                }
1798
                xy += wrap;
1799
                b8_xy +=2;
1800
            }
1801
        }
1802

    
1803
        s->dest[0] += 16 >> lowres;
1804
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1805
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1806

    
1807
        MPV_decode_mb(s, s->block);
1808

    
1809
        if (++s->mb_x >= s->mb_width) {
1810
            const int mb_size= 16>>s->avctx->lowres;
1811

    
1812
            ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1813
            MPV_report_decode_progress(s);
1814

    
1815
            s->mb_x = 0;
1816
            s->mb_y += 1<<field_pic;
1817

    
1818
            if(s->mb_y >= s->mb_height){
1819
                int left= get_bits_left(&s->gb);
1820
                int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1821
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1822
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1823

    
1824
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1825
                   || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1826
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1827
                    return -1;
1828
                }else
1829
                    goto eos;
1830
            }
1831

    
1832
            ff_init_block_index(s);
1833
        }
1834

    
1835
        /* skip mb handling */
1836
        if (s->mb_skip_run == -1) {
1837
            /* read increment again */
1838
            s->mb_skip_run = 0;
1839
            for(;;) {
1840
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1841
                if (code < 0){
1842
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1843
                    return -1;
1844
                }
1845
                if (code >= 33) {
1846
                    if (code == 33) {
1847
                        s->mb_skip_run += 33;
1848
                    }else if(code == 35){
1849
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1850
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1851
                            return -1;
1852
                        }
1853
                        goto eos; /* end of slice */
1854
                    }
1855
                    /* otherwise, stuffing, nothing to do */
1856
                } else {
1857
                    s->mb_skip_run += code;
1858
                    break;
1859
                }
1860
            }
1861
            if(s->mb_skip_run){
1862
                int i;
1863
                if(s->pict_type == FF_I_TYPE){
1864
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1865
                    return -1;
1866
                }
1867

    
1868
                /* skip mb */
1869
                s->mb_intra = 0;
1870
                for(i=0;i<12;i++)
1871
                    s->block_last_index[i] = -1;
1872
                if(s->picture_structure == PICT_FRAME)
1873
                    s->mv_type = MV_TYPE_16X16;
1874
                else
1875
                    s->mv_type = MV_TYPE_FIELD;
1876
                if (s->pict_type == FF_P_TYPE) {
1877
                    /* if P type, zero motion vector is implied */
1878
                    s->mv_dir = MV_DIR_FORWARD;
1879
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1880
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1881
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1882
                    s->field_select[0][0]= (s->picture_structure - 1) & 1;
1883
                } else {
1884
                    /* if B type, reuse previous vectors and directions */
1885
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1886
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1887
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1888
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1889
                }
1890
            }
1891
        }
1892
    }
1893
eos: // end of slice
1894
    *buf += (get_bits_count(&s->gb)-1)/8;
1895
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1896
    return 0;
1897
}
1898

    
1899
static int slice_decode_thread(AVCodecContext *c, void *arg){
1900
    MpegEncContext *s= *(void**)arg;
1901
    const uint8_t *buf= s->gb.buffer;
1902
    int mb_y= s->start_mb_y;
1903
    const int field_pic= s->picture_structure != PICT_FRAME;
1904

    
1905
    s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1906

    
1907
    for(;;){
1908
        uint32_t start_code;
1909
        int ret;
1910

    
1911
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1912
        emms_c();
1913
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1914
//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);
1915
        if(ret < 0){
1916
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1917
                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);
1918
        }else{
1919
            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);
1920
        }
1921

    
1922
        if(s->mb_y == s->end_mb_y)
1923
            return 0;
1924

    
1925
        start_code= -1;
1926
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1927
        mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1928
        if (s->picture_structure == PICT_BOTTOM_FIELD)
1929
            mb_y++;
1930
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1931
            return -1;
1932
    }
1933

    
1934
    return 0; //not reached
1935
}
1936

    
1937
/**
1938
 * Handle slice ends.
1939
 * @return 1 if it seems to be the last slice
1940
 */
1941
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1942
{
1943
    Mpeg1Context *s1 = avctx->priv_data;
1944
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1945

    
1946
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1947
        return 0;
1948

    
1949
    if (s->avctx->hwaccel) {
1950
        if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1951
            av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1952
    }
1953

    
1954
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1955
        ff_xvmc_field_end(s);
1956

    
1957
    /* end of slice reached */
1958
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1959
        /* end of image */
1960

    
1961
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1962

    
1963
        ff_er_frame_end(s);
1964

    
1965
        MPV_frame_end(s);
1966

    
1967
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1968
            *pict= *(AVFrame*)s->current_picture_ptr;
1969
            ff_print_debug_info(s, pict);
1970
        } else {
1971
            if (avctx->active_thread_type&FF_THREAD_FRAME)
1972
                s->picture_number++;
1973
            /* latency of 1 frame for I- and P-frames */
1974
            /* XXX: use another variable than picture_number */
1975
            if (s->last_picture_ptr != NULL) {
1976
                *pict= *(AVFrame*)s->last_picture_ptr;
1977
                 ff_print_debug_info(s, pict);
1978
            }
1979
        }
1980

    
1981
        return 1;
1982
    } else {
1983
        return 0;
1984
    }
1985
}
1986

    
1987
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1988
                                 const uint8_t *buf, int buf_size)
1989
{
1990
    Mpeg1Context *s1 = avctx->priv_data;
1991
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1992
    int width,height;
1993
    int i, v, j;
1994

    
1995
    init_get_bits(&s->gb, buf, buf_size*8);
1996

    
1997
    width = get_bits(&s->gb, 12);
1998
    height = get_bits(&s->gb, 12);
1999
    if (width <= 0 || height <= 0)
2000
        return -1;
2001
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2002
    if (s->aspect_ratio_info == 0) {
2003
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2004
        if (avctx->error_recognition >= FF_ER_COMPLIANT)
2005
            return -1;
2006
    }
2007
    s->frame_rate_index = get_bits(&s->gb, 4);
2008
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2009
        return -1;
2010
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2011
    if (get_bits1(&s->gb) == 0) /* marker */
2012
        return -1;
2013
    s->width = width;
2014
    s->height = height;
2015

    
2016
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2017
    skip_bits(&s->gb, 1);
2018

    
2019
    /* get matrix */
2020
    if (get_bits1(&s->gb)) {
2021
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2022
    } else {
2023
        for(i=0;i<64;i++) {
2024
            j = s->dsp.idct_permutation[i];
2025
            v = ff_mpeg1_default_intra_matrix[i];
2026
            s->intra_matrix[j] = v;
2027
            s->chroma_intra_matrix[j] = v;
2028
        }
2029
    }
2030
    if (get_bits1(&s->gb)) {
2031
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2032
    } else {
2033
        for(i=0;i<64;i++) {
2034
            int j= s->dsp.idct_permutation[i];
2035
            v = ff_mpeg1_default_non_intra_matrix[i];
2036
            s->inter_matrix[j] = v;
2037
            s->chroma_inter_matrix[j] = v;
2038
        }
2039
    }
2040

    
2041
    if(show_bits(&s->gb, 23) != 0){
2042
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2043
        return -1;
2044
    }
2045

    
2046
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2047
    s->progressive_sequence = 1;
2048
    s->progressive_frame = 1;
2049
    s->picture_structure = PICT_FRAME;
2050
    s->frame_pred_frame_dct = 1;
2051
    s->chroma_format = 1;
2052
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2053
    avctx->sub_id = 1; /* indicates MPEG-1 */
2054
    s->out_format = FMT_MPEG1;
2055
    s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2056
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2057

    
2058
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2059
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2060
               s->avctx->rc_buffer_size, s->bit_rate);
2061

    
2062
    return 0;
2063
}
2064

    
2065
static int vcr2_init_sequence(AVCodecContext *avctx)
2066
{
2067
    Mpeg1Context *s1 = avctx->priv_data;
2068
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2069
    int i, v;
2070

    
2071
    /* start new MPEG-1 context decoding */
2072
    s->out_format = FMT_MPEG1;
2073
    if (s1->mpeg_enc_ctx_allocated) {
2074
        MPV_common_end(s);
2075
    }
2076
    s->width  = avctx->coded_width;
2077
    s->height = avctx->coded_height;
2078
    avctx->has_b_frames= 0; //true?
2079
    s->low_delay= 1;
2080

    
2081
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2082
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2083

    
2084
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2085
        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2086
        if( avctx->idct_algo == FF_IDCT_AUTO )
2087
            avctx->idct_algo = FF_IDCT_SIMPLE;
2088

    
2089
    if (MPV_common_init(s) < 0)
2090
        return -1;
2091
    exchange_uv(s);//common init reset pblocks, so we swap them here
2092
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2093
    s1->mpeg_enc_ctx_allocated = 1;
2094

    
2095
    for(i=0;i<64;i++) {
2096
        int j= s->dsp.idct_permutation[i];
2097
        v = ff_mpeg1_default_intra_matrix[i];
2098
        s->intra_matrix[j] = v;
2099
        s->chroma_intra_matrix[j] = v;
2100

    
2101
        v = ff_mpeg1_default_non_intra_matrix[i];
2102
        s->inter_matrix[j] = v;
2103
        s->chroma_inter_matrix[j] = v;
2104
    }
2105

    
2106
    s->progressive_sequence = 1;
2107
    s->progressive_frame = 1;
2108
    s->picture_structure = PICT_FRAME;
2109
    s->frame_pred_frame_dct = 1;
2110
    s->chroma_format = 1;
2111
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2112
    avctx->sub_id = 2; /* indicates MPEG-2 */
2113
    s1->save_width           = s->width;
2114
    s1->save_height          = s->height;
2115
    s1->save_progressive_seq = s->progressive_sequence;
2116
    return 0;
2117
}
2118

    
2119

    
2120
static void mpeg_decode_user_data(AVCodecContext *avctx,
2121
                                  const uint8_t *p, int buf_size)
2122
{
2123
    const uint8_t *buf_end = p+buf_size;
2124

    
2125
    /* we parse the DTG active format information */
2126
    if (buf_end - p >= 5 &&
2127
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2128
        int flags = p[4];
2129
        p += 5;
2130
        if (flags & 0x80) {
2131
            /* skip event id */
2132
            p += 2;
2133
        }
2134
        if (flags & 0x40) {
2135
            if (buf_end - p < 1)
2136
                return;
2137
            avctx->dtg_active_format = p[0] & 0x0f;
2138
        }
2139
    }
2140
}
2141

    
2142
static void mpeg_decode_gop(AVCodecContext *avctx,
2143
                            const uint8_t *buf, int buf_size){
2144
    Mpeg1Context *s1 = avctx->priv_data;
2145
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2146

    
2147
    int drop_frame_flag;
2148
    int time_code_hours, time_code_minutes;
2149
    int time_code_seconds, time_code_pictures;
2150
    int broken_link;
2151

    
2152
    init_get_bits(&s->gb, buf, buf_size*8);
2153

    
2154
    drop_frame_flag = get_bits1(&s->gb);
2155

    
2156
    time_code_hours=get_bits(&s->gb,5);
2157
    time_code_minutes = get_bits(&s->gb,6);
2158
    skip_bits1(&s->gb);//marker bit
2159
    time_code_seconds = get_bits(&s->gb,6);
2160
    time_code_pictures = get_bits(&s->gb,6);
2161

    
2162
    s->closed_gop = get_bits1(&s->gb);
2163
    /*broken_link indicate that after editing the
2164
      reference frames of the first B-Frames after GOP I-Frame
2165
      are missing (open gop)*/
2166
    broken_link = get_bits1(&s->gb);
2167

    
2168
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2169
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2170
            time_code_hours, time_code_minutes, time_code_seconds,
2171
            time_code_pictures, s->closed_gop, broken_link);
2172
}
2173
/**
2174
 * Find the end of the current frame in the bitstream.
2175
 * @return the position of the first byte of the next frame, or -1
2176
 */
2177
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2178
{
2179
    int i;
2180
    uint32_t state= pc->state;
2181

    
2182
    /* EOF considered as end of frame */
2183
    if (buf_size == 0)
2184
        return 0;
2185

    
2186
/*
2187
 0  frame start         -> 1/4
2188
 1  first_SEQEXT        -> 0/2
2189
 2  first field start   -> 3/0
2190
 3  second_SEQEXT       -> 2/0
2191
 4  searching end
2192
*/
2193

    
2194
    for(i=0; i<buf_size; i++){
2195
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2196
        if(pc->frame_start_found&1){
2197
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2198
                pc->frame_start_found--;
2199
            else if(state == EXT_START_CODE+2){
2200
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2201
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2202
            }
2203
            state++;
2204
        }else{
2205
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2206
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2207
                i++;
2208
                pc->frame_start_found=4;
2209
            }
2210
            if(state == SEQ_END_CODE){
2211
                pc->state=-1;
2212
                return i+1;
2213
            }
2214
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2215
                pc->frame_start_found= 0;
2216
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2217
                pc->frame_start_found++;
2218
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2219
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2220
                    pc->frame_start_found=0;
2221
                    pc->state=-1;
2222
                    return i-3;
2223
                }
2224
            }
2225
            if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2226
                ff_fetch_timestamp(s, i-3, 1);
2227
            }
2228
        }
2229
    }
2230
    pc->state= state;
2231
    return END_NOT_FOUND;
2232
}
2233

    
2234
static int decode_chunks(AVCodecContext *avctx,
2235
                             AVFrame *picture, int *data_size,
2236
                             const uint8_t *buf, int buf_size);
2237

    
2238
/* handle buffering and image synchronisation */
2239
static int mpeg_decode_frame(AVCodecContext *avctx,
2240
                             void *data, int *data_size,
2241
                             AVPacket *avpkt)
2242
{
2243
    const uint8_t *buf = avpkt->data;
2244
    int buf_size = avpkt->size;
2245
    Mpeg1Context *s = avctx->priv_data;
2246
    AVFrame *picture = data;
2247
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2248
    av_dlog(avctx, "fill_buffer\n");
2249

    
2250
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2251
        /* special case for last picture */
2252
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2253
            *picture= *(AVFrame*)s2->next_picture_ptr;
2254
            s2->next_picture_ptr= NULL;
2255

    
2256
            *data_size = sizeof(AVFrame);
2257
        }
2258
        return buf_size;
2259
    }
2260

    
2261
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2262
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2263

    
2264
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2265
            return buf_size;
2266
    }
2267

    
2268
#if 0
2269
    if (s->repeat_field % 2 == 1) {
2270
        s->repeat_field++;
2271
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2272
        //        s2->picture_number, s->repeat_field);
2273
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2274
            *data_size = sizeof(AVPicture);
2275
            goto the_end;
2276
        }
2277
    }
2278
#endif
2279

    
2280
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2281
        vcr2_init_sequence(avctx);
2282

    
2283
    s->slice_count= 0;
2284

    
2285
    if(avctx->extradata && !avctx->frame_number)
2286
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2287

    
2288
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2289
}
2290

    
2291
static int decode_chunks(AVCodecContext *avctx,
2292
                             AVFrame *picture, int *data_size,
2293
                             const uint8_t *buf, int buf_size)
2294
{
2295
    Mpeg1Context *s = avctx->priv_data;
2296
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2297
    const uint8_t *buf_ptr = buf;
2298
    const uint8_t *buf_end = buf + buf_size;
2299
    int ret, input_size;
2300
    int last_code= 0;
2301

    
2302
    for(;;) {
2303
        /* find next start code */
2304
        uint32_t start_code = -1;
2305
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2306
        if (start_code > 0x1ff){
2307
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2308
                if(HAVE_THREADS && avctx->active_thread_type&FF_THREAD_SLICE){
2309
                    int i;
2310

    
2311
                    avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2312
                    for(i=0; i<s->slice_count; i++)
2313
                        s2->error_count += s2->thread_context[i]->error_count;
2314
                }
2315

    
2316
                if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2317
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2318

    
2319
                if (slice_end(avctx, picture)) {
2320
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2321
                        *data_size = sizeof(AVPicture);
2322
                }
2323
            }
2324
            s2->pict_type= 0;
2325
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2326
        }
2327

    
2328
        input_size = buf_end - buf_ptr;
2329

    
2330
        if(avctx->debug & FF_DEBUG_STARTCODE){
2331
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2332
        }
2333

    
2334
        /* prepare data for next start code */
2335
        switch(start_code) {
2336
        case SEQ_START_CODE:
2337
            if(last_code == 0){
2338
            mpeg1_decode_sequence(avctx, buf_ptr,
2339
                                    input_size);
2340
                s->sync=1;
2341
            }else{
2342
                av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2343
            }
2344
            break;
2345

    
2346
        case PICTURE_START_CODE:
2347
            if (HAVE_THREADS && (avctx->active_thread_type&FF_THREAD_SLICE) && s->slice_count) {
2348
                int i;
2349

    
2350
                avctx->execute(avctx, slice_decode_thread,
2351
                               s2->thread_context, NULL,
2352
                               s->slice_count, sizeof(void*));
2353
                for (i = 0; i < s->slice_count; i++)
2354
                    s2->error_count += s2->thread_context[i]->error_count;
2355
                s->slice_count = 0;
2356
            }
2357
            if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2358
            if(mpeg_decode_postinit(avctx) < 0){
2359
                av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2360
                return -1;
2361
            }
2362

    
2363
            /* we have a complete image: we try to decompress it */
2364
            if(mpeg1_decode_picture(avctx,
2365
                                    buf_ptr, input_size) < 0)
2366
                s2->pict_type=0;
2367
                s2->first_slice = 1;
2368
            last_code= PICTURE_START_CODE;
2369
            }else{
2370
                av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2371
            }
2372
            break;
2373
        case EXT_START_CODE:
2374
            init_get_bits(&s2->gb, buf_ptr, input_size*8);
2375

    
2376
            switch(get_bits(&s2->gb, 4)) {
2377
            case 0x1:
2378
                if(last_code == 0){
2379
                mpeg_decode_sequence_extension(s);
2380
                }else{
2381
                    av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2382
                }
2383
                break;
2384
            case 0x2:
2385
                mpeg_decode_sequence_display_extension(s);
2386
                break;
2387
            case 0x3:
2388
                mpeg_decode_quant_matrix_extension(s2);
2389
                break;
2390
            case 0x7:
2391
                mpeg_decode_picture_display_extension(s);
2392
                break;
2393
            case 0x8:
2394
                if(last_code == PICTURE_START_CODE){
2395
                mpeg_decode_picture_coding_extension(s);
2396
                }else{
2397
                    av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2398
                }
2399
                break;
2400
            }
2401
            break;
2402
        case USER_START_CODE:
2403
            mpeg_decode_user_data(avctx,
2404
                                    buf_ptr, input_size);
2405
            break;
2406
        case GOP_START_CODE:
2407
            if(last_code == 0){
2408
            s2->first_field=0;
2409
            mpeg_decode_gop(avctx,
2410
                                    buf_ptr, input_size);
2411
                s->sync=1;
2412
            }else{
2413
                av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2414
            }
2415
            break;
2416
        default:
2417
            if (start_code >= SLICE_MIN_START_CODE &&
2418
                start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2419
                const int field_pic= s2->picture_structure != PICT_FRAME;
2420
                int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2421
                last_code= SLICE_MIN_START_CODE;
2422

    
2423
                if(s2->picture_structure == PICT_BOTTOM_FIELD)
2424
                    mb_y++;
2425

    
2426
                if (mb_y >= s2->mb_height){
2427
                    av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2428
                    return -1;
2429
                }
2430

    
2431
                if(s2->last_picture_ptr==NULL){
2432
                /* Skip B-frames if we do not have reference frames and gop is not closed */
2433
                    if(s2->pict_type==FF_B_TYPE){
2434
                        if(!s2->closed_gop)
2435
                            break;
2436
                    }
2437
                }
2438
                if(s2->pict_type==FF_I_TYPE)
2439
                    s->sync=1;
2440
                if(s2->next_picture_ptr==NULL){
2441
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2442
                    if(s2->pict_type==FF_P_TYPE && !s->sync) break;
2443
                }
2444
                /* Skip B-frames if we are in a hurry. */
2445
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2446
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2447
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2448
                    || avctx->skip_frame >= AVDISCARD_ALL)
2449
                    break;
2450
                /* Skip everything if we are in a hurry>=5. */
2451
                if(avctx->hurry_up>=5) break;
2452

    
2453
                if (!s->mpeg_enc_ctx_allocated) break;
2454

    
2455
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2456
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2457
                        break;
2458
                }
2459

    
2460
                if(!s2->pict_type){
2461
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2462
                    break;
2463
                }
2464

    
2465
                if(s2->first_slice){
2466
                    s2->first_slice=0;
2467
                    if(mpeg_field_start(s2, buf, buf_size) < 0)
2468
                        return -1;
2469
                }
2470
                if(!s2->current_picture_ptr){
2471
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2472
                    return -1;
2473
                }
2474

    
2475
                if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2476
                    s->slice_count++;
2477
                    break;
2478
                }
2479

    
2480
                if(HAVE_THREADS && avctx->active_thread_type&FF_THREAD_SLICE){
2481
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2482
                    if(threshold <= mb_y){
2483
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2484

    
2485
                        thread_context->start_mb_y= mb_y;
2486
                        thread_context->end_mb_y  = s2->mb_height;
2487
                        if(s->slice_count){
2488
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2489
                            ff_update_duplicate_context(thread_context, s2);
2490
                        }
2491
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2492
                        s->slice_count++;
2493
                    }
2494
                    buf_ptr += 2; //FIXME add minimum number of bytes per slice
2495
                }else{
2496
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2497
                    emms_c();
2498

    
2499
                    if(ret < 0){
2500
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2501
                            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);
2502
                    }else{
2503
                        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);
2504
                    }
2505
                }
2506
            }
2507
            break;
2508
        }
2509
    }
2510
}
2511

    
2512
static void flush(AVCodecContext *avctx){
2513
    Mpeg1Context *s = avctx->priv_data;
2514

    
2515
    s->sync=0;
2516

    
2517
    ff_mpeg_flush(avctx);
2518
}
2519

    
2520
static int mpeg_decode_end(AVCodecContext *avctx)
2521
{
2522
    Mpeg1Context *s = avctx->priv_data;
2523

    
2524
    if (s->mpeg_enc_ctx_allocated)
2525
        MPV_common_end(&s->mpeg_enc_ctx);
2526
    return 0;
2527
}
2528

    
2529
static const AVProfile mpeg2_video_profiles[] = {
2530
    { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2531
    { FF_PROFILE_MPEG2_HIGH,         "High"               },
2532
    { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2533
    { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2534
    { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2535
    { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2536
    { FF_PROFILE_RESERVED,           "Reserved"           },
2537
    { FF_PROFILE_RESERVED,           "Reserved"           },
2538
};
2539

    
2540

    
2541
AVCodec ff_mpeg1video_decoder = {
2542
    "mpeg1video",
2543
    AVMEDIA_TYPE_VIDEO,
2544
    CODEC_ID_MPEG1VIDEO,
2545
    sizeof(Mpeg1Context),
2546
    mpeg_decode_init,
2547
    NULL,
2548
    mpeg_decode_end,
2549
    mpeg_decode_frame,
2550
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2551
    .flush= flush,
2552
    .max_lowres= 3,
2553
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2554
    .update_thread_context= ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2555
};
2556

    
2557
AVCodec ff_mpeg2video_decoder = {
2558
    "mpeg2video",
2559
    AVMEDIA_TYPE_VIDEO,
2560
    CODEC_ID_MPEG2VIDEO,
2561
    sizeof(Mpeg1Context),
2562
    mpeg_decode_init,
2563
    NULL,
2564
    mpeg_decode_end,
2565
    mpeg_decode_frame,
2566
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2567
    .flush= flush,
2568
    .max_lowres= 3,
2569
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2570
    .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2571
};
2572

    
2573
//legacy decoder
2574
AVCodec ff_mpegvideo_decoder = {
2575
    "mpegvideo",
2576
    AVMEDIA_TYPE_VIDEO,
2577
    CODEC_ID_MPEG2VIDEO,
2578
    sizeof(Mpeg1Context),
2579
    mpeg_decode_init,
2580
    NULL,
2581
    mpeg_decode_end,
2582
    mpeg_decode_frame,
2583
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2584
    .flush= flush,
2585
    .max_lowres= 3,
2586
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2587
};
2588

    
2589
#if CONFIG_MPEG_XVMC_DECODER
2590
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2591
    if( avctx->active_thread_type & FF_THREAD_SLICE )
2592
        return -1;
2593
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2594
        return -1;
2595
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2596
        av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2597
    }
2598
    mpeg_decode_init(avctx);
2599

    
2600
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2601
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2602

    
2603
    return 0;
2604
}
2605

    
2606
AVCodec ff_mpeg_xvmc_decoder = {
2607
    "mpegvideo_xvmc",
2608
    AVMEDIA_TYPE_VIDEO,
2609
    CODEC_ID_MPEG2VIDEO_XVMC,
2610
    sizeof(Mpeg1Context),
2611
    mpeg_mc_decode_init,
2612
    NULL,
2613
    mpeg_decode_end,
2614
    mpeg_decode_frame,
2615
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2616
    .flush= flush,
2617
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2618
};
2619

    
2620
#endif
2621

    
2622
#if CONFIG_MPEG_VDPAU_DECODER
2623
AVCodec ff_mpeg_vdpau_decoder = {
2624
    "mpegvideo_vdpau",
2625
    AVMEDIA_TYPE_VIDEO,
2626
    CODEC_ID_MPEG2VIDEO,
2627
    sizeof(Mpeg1Context),
2628
    mpeg_decode_init,
2629
    NULL,
2630
    mpeg_decode_end,
2631
    mpeg_decode_frame,
2632
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2633
    .flush= flush,
2634
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2635
};
2636
#endif
2637

    
2638
#if CONFIG_MPEG1_VDPAU_DECODER
2639
AVCodec ff_mpeg1_vdpau_decoder = {
2640
    "mpeg1video_vdpau",
2641
    AVMEDIA_TYPE_VIDEO,
2642
    CODEC_ID_MPEG1VIDEO,
2643
    sizeof(Mpeg1Context),
2644
    mpeg_decode_init,
2645
    NULL,
2646
    mpeg_decode_end,
2647
    mpeg_decode_frame,
2648
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2649
    .flush= flush,
2650
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2651
};
2652
#endif
2653