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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.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

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

    
28
//#define DEBUG
29
#include "internal.h"
30
#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"
39
#include "xvmc_internal.h"
40
#include "thread.h"
41

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

    
45

    
46
#define MV_VLC_BITS 9
47
#define MBINCR_VLC_BITS 9
48
#define MB_PAT_VLC_BITS 9
49
#define MB_PTYPE_VLC_BITS 6
50
#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,
56
                              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,
63
                                    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
                //we ignore the spec here as reality does not match the spec, see for example
1297
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1298
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1299
                    s->avctx->sample_aspect_ratio=
1300
                        av_div_q(
1301
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1302
                         (AVRational){s->width, s->height}
1303
                         );
1304
                }else{
1305
                    s->avctx->sample_aspect_ratio=
1306
                        av_div_q(
1307
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1308
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1309
                        );
1310
                }
1311
            }else{
1312
                s->avctx->sample_aspect_ratio=
1313
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1314
            }
1315
        }//MPEG-2
1316

    
1317
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1318
        avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1319
        //until then pix_fmt may be changed right after codec init
1320
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1321
            avctx->hwaccel ||
1322
            s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1323
            if( avctx->idct_algo == FF_IDCT_AUTO )
1324
                avctx->idct_algo = FF_IDCT_SIMPLE;
1325

    
1326
        /* Quantization matrices may need reordering
1327
         * if DCT permutation is changed. */
1328
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1329

    
1330
        if (MPV_common_init(s) < 0)
1331
            return -2;
1332

    
1333
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1334
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1335
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1336
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1337

    
1338
        s1->mpeg_enc_ctx_allocated = 1;
1339
    }
1340
    return 0;
1341
}
1342

    
1343
static int mpeg1_decode_picture(AVCodecContext *avctx,
1344
                                const uint8_t *buf, int buf_size)
1345
{
1346
    Mpeg1Context *s1 = avctx->priv_data;
1347
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1348
    int ref, f_code, vbv_delay;
1349

    
1350
    init_get_bits(&s->gb, buf, buf_size*8);
1351

    
1352
    ref = get_bits(&s->gb, 10); /* temporal ref */
1353
    s->pict_type = get_bits(&s->gb, 3);
1354
    if(s->pict_type == 0 || s->pict_type > 3)
1355
        return -1;
1356

    
1357
    vbv_delay= get_bits(&s->gb, 16);
1358
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1359
        s->full_pel[0] = get_bits1(&s->gb);
1360
        f_code = get_bits(&s->gb, 3);
1361
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1362
            return -1;
1363
        s->mpeg_f_code[0][0] = f_code;
1364
        s->mpeg_f_code[0][1] = f_code;
1365
    }
1366
    if (s->pict_type == FF_B_TYPE) {
1367
        s->full_pel[1] = get_bits1(&s->gb);
1368
        f_code = get_bits(&s->gb, 3);
1369
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1370
            return -1;
1371
        s->mpeg_f_code[1][0] = f_code;
1372
        s->mpeg_f_code[1][1] = f_code;
1373
    }
1374
    s->current_picture.pict_type= s->pict_type;
1375
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1376

    
1377
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1378
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1379

    
1380
    s->y_dc_scale = 8;
1381
    s->c_dc_scale = 8;
1382
    return 0;
1383
}
1384

    
1385
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1386
{
1387
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1388
    int horiz_size_ext, vert_size_ext;
1389
    int bit_rate_ext;
1390

    
1391
    skip_bits(&s->gb, 1); /* profile and level esc*/
1392
    s->avctx->profile= get_bits(&s->gb, 3);
1393
    s->avctx->level= get_bits(&s->gb, 4);
1394
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1395
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1396
    horiz_size_ext = get_bits(&s->gb, 2);
1397
    vert_size_ext = get_bits(&s->gb, 2);
1398
    s->width |= (horiz_size_ext << 12);
1399
    s->height |= (vert_size_ext << 12);
1400
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1401
    s->bit_rate += (bit_rate_ext << 18) * 400;
1402
    skip_bits1(&s->gb); /* marker */
1403
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1404

    
1405
    s->low_delay = get_bits1(&s->gb);
1406
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1407

    
1408
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1409
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1410

    
1411
    av_dlog(s->avctx, "sequence extension\n");
1412
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1413
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1414

    
1415
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1416
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1417
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1418

    
1419
}
1420

    
1421
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1422
{
1423
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1424
    int color_description, w, h;
1425

    
1426
    skip_bits(&s->gb, 3); /* video format */
1427
    color_description= get_bits1(&s->gb);
1428
    if(color_description){
1429
        s->avctx->color_primaries= get_bits(&s->gb, 8);
1430
        s->avctx->color_trc      = get_bits(&s->gb, 8);
1431
        s->avctx->colorspace     = get_bits(&s->gb, 8);
1432
    }
1433
    w= get_bits(&s->gb, 14);
1434
    skip_bits(&s->gb, 1); //marker
1435
    h= get_bits(&s->gb, 14);
1436
    // remaining 3 bits are zero padding
1437

    
1438
    s1->pan_scan.width= 16*w;
1439
    s1->pan_scan.height=16*h;
1440

    
1441
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1442
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1443
}
1444

    
1445
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1446
{
1447
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1448
    int i,nofco;
1449

    
1450
    nofco = 1;
1451
    if(s->progressive_sequence){
1452
        if(s->repeat_first_field){
1453
            nofco++;
1454
            if(s->top_field_first)
1455
                nofco++;
1456
        }
1457
    }else{
1458
        if(s->picture_structure == PICT_FRAME){
1459
            nofco++;
1460
            if(s->repeat_first_field)
1461
                nofco++;
1462
        }
1463
    }
1464
    for(i=0; i<nofco; i++){
1465
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1466
        skip_bits(&s->gb, 1); //marker
1467
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1468
        skip_bits(&s->gb, 1); //marker
1469
    }
1470

    
1471
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1472
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1473
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1474
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1475
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1476
        );
1477
}
1478

    
1479
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1480
    int i;
1481

    
1482
    for(i=0; i<64; i++) {
1483
        int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1484
        int v = get_bits(&s->gb, 8);
1485
        if(v==0){
1486
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1487
            return -1;
1488
        }
1489
        if(intra && i==0 && v!=8){
1490
            av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1491
            v= 8; // needed by pink.mpg / issue1046
1492
        }
1493
        matrix0[j] = v;
1494
        if(matrix1)
1495
            matrix1[j] = v;
1496
    }
1497
    return 0;
1498
}
1499

    
1500
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1501
{
1502
    av_dlog(s->avctx, "matrix extension\n");
1503

    
1504
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1505
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1506
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1507
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1508
}
1509

    
1510
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1511
{
1512
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1513

    
1514
    s->full_pel[0] = s->full_pel[1] = 0;
1515
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1516
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1517
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1518
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1519
    if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1520
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1521
        if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1522
            if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1523
                s->pict_type= FF_I_TYPE;
1524
            else
1525
                s->pict_type= FF_P_TYPE;
1526
        }else
1527
            s->pict_type= FF_B_TYPE;
1528
        s->current_picture.pict_type= s->pict_type;
1529
        s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1530
    }
1531
    s->intra_dc_precision = get_bits(&s->gb, 2);
1532
    s->picture_structure = get_bits(&s->gb, 2);
1533
    s->top_field_first = get_bits1(&s->gb);
1534
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1535
    s->concealment_motion_vectors = get_bits1(&s->gb);
1536
    s->q_scale_type = get_bits1(&s->gb);
1537
    s->intra_vlc_format = get_bits1(&s->gb);
1538
    s->alternate_scan = get_bits1(&s->gb);
1539
    s->repeat_first_field = get_bits1(&s->gb);
1540
    s->chroma_420_type = get_bits1(&s->gb);
1541
    s->progressive_frame = get_bits1(&s->gb);
1542

    
1543
    if(s->progressive_sequence && !s->progressive_frame){
1544
        s->progressive_frame= 1;
1545
        av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1546
    }
1547

    
1548
    if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1549
        av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1550
        s->picture_structure= PICT_FRAME;
1551
    }
1552

    
1553
    if(s->progressive_sequence && !s->frame_pred_frame_dct){
1554
        av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1555
        s->frame_pred_frame_dct= 1;
1556
    }
1557

    
1558
    if(s->picture_structure == PICT_FRAME){
1559
        s->first_field=0;
1560
        s->v_edge_pos= 16*s->mb_height;
1561
    }else{
1562
        s->first_field ^= 1;
1563
        s->v_edge_pos=  8*s->mb_height;
1564
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1565
    }
1566

    
1567
    if(s->alternate_scan){
1568
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1569
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1570
    }else{
1571
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1572
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1573
    }
1574

    
1575
    /* composite display not parsed */
1576
    av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1577
    av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1578
    av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1579
    av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1580
    av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1581
    av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1582
    av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1583
    av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1584
    av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1585
}
1586

    
1587
static void exchange_uv(MpegEncContext *s){
1588
    DCTELEM (*tmp)[64];
1589

    
1590
    tmp           = s->pblocks[4];
1591
    s->pblocks[4] = s->pblocks[5];
1592
    s->pblocks[5] = tmp;
1593
}
1594

    
1595
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1596
    AVCodecContext *avctx= s->avctx;
1597
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1598

    
1599
    /* start frame decoding */
1600
    if(s->first_field || s->picture_structure==PICT_FRAME){
1601
        if(MPV_frame_start(s, avctx) < 0)
1602
            return -1;
1603

    
1604
        ff_er_frame_start(s);
1605

    
1606
        /* first check if we must repeat the frame */
1607
        s->current_picture_ptr->repeat_pict = 0;
1608
        if (s->repeat_first_field) {
1609
            if (s->progressive_sequence) {
1610
                if (s->top_field_first)
1611
                    s->current_picture_ptr->repeat_pict = 4;
1612
                else
1613
                    s->current_picture_ptr->repeat_pict = 2;
1614
            } else if (s->progressive_frame) {
1615
                s->current_picture_ptr->repeat_pict = 1;
1616
            }
1617
        }
1618

    
1619
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1620

    
1621
        if (HAVE_PTHREADS && avctx->active_thread_type&FF_THREAD_FRAME)
1622
            ff_thread_finish_setup(avctx);
1623
    }else{ //second field
1624
            int i;
1625

    
1626
            if(!s->current_picture_ptr){
1627
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1628
                return -1;
1629
            }
1630

    
1631
            for(i=0; i<4; i++){
1632
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1633
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1634
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1635
                }
1636
            }
1637
    }
1638

    
1639
    if (avctx->hwaccel) {
1640
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1641
            return -1;
1642
    }
1643

    
1644
// MPV_frame_start will call this function too,
1645
// but we need to call it on every field
1646
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1647
        if(ff_xvmc_field_start(s,avctx) < 0)
1648
            return -1;
1649

    
1650
    return 0;
1651
}
1652

    
1653
#define DECODE_SLICE_ERROR -1
1654
#define DECODE_SLICE_OK 0
1655

    
1656
/**
1657
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1658
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1659
 *         DECODE_SLICE_OK if this slice is ok<br>
1660
 */
1661
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1662
                             const uint8_t **buf, int buf_size)
1663
{
1664
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1665
    AVCodecContext *avctx= s->avctx;
1666
    const int field_pic= s->picture_structure != PICT_FRAME;
1667
    const int lowres= s->avctx->lowres;
1668

    
1669
    s->resync_mb_x=
1670
    s->resync_mb_y= -1;
1671

    
1672
    assert(mb_y < s->mb_height);
1673

    
1674
    init_get_bits(&s->gb, *buf, buf_size*8);
1675

    
1676
    ff_mpeg1_clean_buffers(s);
1677
    s->interlaced_dct = 0;
1678

    
1679
    s->qscale = get_qscale(s);
1680

    
1681
    if(s->qscale == 0){
1682
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1683
        return -1;
1684
    }
1685

    
1686
    /* extra slice info */
1687
    while (get_bits1(&s->gb) != 0) {
1688
        skip_bits(&s->gb, 8);
1689
    }
1690

    
1691
    s->mb_x=0;
1692

    
1693
    if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1694
        skip_bits1(&s->gb);
1695
    }else{
1696
        for(;;) {
1697
            int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1698
            if (code < 0){
1699
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1700
                return -1;
1701
            }
1702
            if (code >= 33) {
1703
                if (code == 33) {
1704
                    s->mb_x += 33;
1705
                }
1706
                /* otherwise, stuffing, nothing to do */
1707
            } else {
1708
                s->mb_x += code;
1709
                break;
1710
            }
1711
        }
1712
    }
1713

    
1714
    if(s->mb_x >= (unsigned)s->mb_width){
1715
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1716
        return -1;
1717
    }
1718

    
1719
    if (avctx->hwaccel) {
1720
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1721
        int start_code = -1;
1722
        buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1723
        if (buf_end < *buf + buf_size)
1724
            buf_end -= 4;
1725
        s->mb_y = mb_y;
1726
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1727
            return DECODE_SLICE_ERROR;
1728
        *buf = buf_end;
1729
        return DECODE_SLICE_OK;
1730
    }
1731

    
1732
    s->resync_mb_x= s->mb_x;
1733
    s->resync_mb_y= s->mb_y= mb_y;
1734
    s->mb_skip_run= 0;
1735
    ff_init_block_index(s);
1736

    
1737
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1738
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1739
             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",
1740
                 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],
1741
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1742
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1743
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1744
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1745
        }
1746
    }
1747

    
1748
    for(;;) {
1749
        //If 1, we memcpy blocks in xvmcvideo.
1750
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1751
            ff_xvmc_init_block(s);//set s->block
1752

    
1753
        if(mpeg_decode_mb(s, s->block) < 0)
1754
            return -1;
1755

    
1756
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1757
            const int wrap = s->b8_stride;
1758
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1759
            int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1760
            int motion_x, motion_y, dir, i;
1761

    
1762
            for(i=0; i<2; i++){
1763
                for(dir=0; dir<2; dir++){
1764
                    if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1765
                        motion_x = motion_y = 0;
1766
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1767
                        motion_x = s->mv[dir][0][0];
1768
                        motion_y = s->mv[dir][0][1];
1769
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1770
                        motion_x = s->mv[dir][i][0];
1771
                        motion_y = s->mv[dir][i][1];
1772
                    }
1773

    
1774
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1775
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1776
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1777
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1778
                    s->current_picture.ref_index [dir][b8_xy    ]=
1779
                    s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1780
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1781
                }
1782
                xy += wrap;
1783
                b8_xy +=2;
1784
            }
1785
        }
1786

    
1787
        s->dest[0] += 16 >> lowres;
1788
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1789
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1790

    
1791
        MPV_decode_mb(s, s->block);
1792

    
1793
        if (++s->mb_x >= s->mb_width) {
1794
            const int mb_size= 16>>s->avctx->lowres;
1795

    
1796
            ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1797
            MPV_report_decode_progress(s);
1798

    
1799
            s->mb_x = 0;
1800
            s->mb_y += 1<<field_pic;
1801

    
1802
            if(s->mb_y >= s->mb_height){
1803
                int left= get_bits_left(&s->gb);
1804
                int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1805
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1806
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1807

    
1808
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1809
                   || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1810
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1811
                    return -1;
1812
                }else
1813
                    goto eos;
1814
            }
1815

    
1816
            ff_init_block_index(s);
1817
        }
1818

    
1819
        /* skip mb handling */
1820
        if (s->mb_skip_run == -1) {
1821
            /* read increment again */
1822
            s->mb_skip_run = 0;
1823
            for(;;) {
1824
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1825
                if (code < 0){
1826
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1827
                    return -1;
1828
                }
1829
                if (code >= 33) {
1830
                    if (code == 33) {
1831
                        s->mb_skip_run += 33;
1832
                    }else if(code == 35){
1833
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1834
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1835
                            return -1;
1836
                        }
1837
                        goto eos; /* end of slice */
1838
                    }
1839
                    /* otherwise, stuffing, nothing to do */
1840
                } else {
1841
                    s->mb_skip_run += code;
1842
                    break;
1843
                }
1844
            }
1845
            if(s->mb_skip_run){
1846
                int i;
1847
                if(s->pict_type == FF_I_TYPE){
1848
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1849
                    return -1;
1850
                }
1851

    
1852
                /* skip mb */
1853
                s->mb_intra = 0;
1854
                for(i=0;i<12;i++)
1855
                    s->block_last_index[i] = -1;
1856
                if(s->picture_structure == PICT_FRAME)
1857
                    s->mv_type = MV_TYPE_16X16;
1858
                else
1859
                    s->mv_type = MV_TYPE_FIELD;
1860
                if (s->pict_type == FF_P_TYPE) {
1861
                    /* if P type, zero motion vector is implied */
1862
                    s->mv_dir = MV_DIR_FORWARD;
1863
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1864
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1865
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1866
                    s->field_select[0][0]= (s->picture_structure - 1) & 1;
1867
                } else {
1868
                    /* if B type, reuse previous vectors and directions */
1869
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1870
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1871
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1872
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1873
                }
1874
            }
1875
        }
1876
    }
1877
eos: // end of slice
1878
    *buf += (get_bits_count(&s->gb)-1)/8;
1879
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1880
    return 0;
1881
}
1882

    
1883
static int slice_decode_thread(AVCodecContext *c, void *arg){
1884
    MpegEncContext *s= *(void**)arg;
1885
    const uint8_t *buf= s->gb.buffer;
1886
    int mb_y= s->start_mb_y;
1887
    const int field_pic= s->picture_structure != PICT_FRAME;
1888

    
1889
    s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1890

    
1891
    for(;;){
1892
        uint32_t start_code;
1893
        int ret;
1894

    
1895
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1896
        emms_c();
1897
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1898
//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);
1899
        if(ret < 0){
1900
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1901
                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);
1902
        }else{
1903
            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);
1904
        }
1905

    
1906
        if(s->mb_y == s->end_mb_y)
1907
            return 0;
1908

    
1909
        start_code= -1;
1910
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1911
        mb_y= start_code - SLICE_MIN_START_CODE;
1912
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1913
            return -1;
1914
    }
1915

    
1916
    return 0; //not reached
1917
}
1918

    
1919
/**
1920
 * Handle slice ends.
1921
 * @return 1 if it seems to be the last slice
1922
 */
1923
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1924
{
1925
    Mpeg1Context *s1 = avctx->priv_data;
1926
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1927

    
1928
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1929
        return 0;
1930

    
1931
    if (s->avctx->hwaccel) {
1932
        if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1933
            av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1934
    }
1935

    
1936
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1937
        ff_xvmc_field_end(s);
1938

    
1939
    /* end of slice reached */
1940
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1941
        /* end of image */
1942

    
1943
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1944

    
1945
        ff_er_frame_end(s);
1946

    
1947
        MPV_frame_end(s);
1948

    
1949
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1950
            *pict= *(AVFrame*)s->current_picture_ptr;
1951
            ff_print_debug_info(s, pict);
1952
        } else {
1953
            if (avctx->active_thread_type&FF_THREAD_FRAME)
1954
                s->picture_number++;
1955
            /* latency of 1 frame for I- and P-frames */
1956
            /* XXX: use another variable than picture_number */
1957
            if (s->last_picture_ptr != NULL) {
1958
                *pict= *(AVFrame*)s->last_picture_ptr;
1959
                 ff_print_debug_info(s, pict);
1960
            }
1961
        }
1962

    
1963
        return 1;
1964
    } else {
1965
        return 0;
1966
    }
1967
}
1968

    
1969
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1970
                                 const uint8_t *buf, int buf_size)
1971
{
1972
    Mpeg1Context *s1 = avctx->priv_data;
1973
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1974
    int width,height;
1975
    int i, v, j;
1976

    
1977
    init_get_bits(&s->gb, buf, buf_size*8);
1978

    
1979
    width = get_bits(&s->gb, 12);
1980
    height = get_bits(&s->gb, 12);
1981
    if (width <= 0 || height <= 0)
1982
        return -1;
1983
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1984
    if (s->aspect_ratio_info == 0) {
1985
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1986
        if (avctx->error_recognition >= FF_ER_COMPLIANT)
1987
            return -1;
1988
    }
1989
    s->frame_rate_index = get_bits(&s->gb, 4);
1990
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1991
        return -1;
1992
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1993
    if (get_bits1(&s->gb) == 0) /* marker */
1994
        return -1;
1995
    s->width = width;
1996
    s->height = height;
1997

    
1998
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1999
    skip_bits(&s->gb, 1);
2000

    
2001
    /* get matrix */
2002
    if (get_bits1(&s->gb)) {
2003
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2004
    } else {
2005
        for(i=0;i<64;i++) {
2006
            j = s->dsp.idct_permutation[i];
2007
            v = ff_mpeg1_default_intra_matrix[i];
2008
            s->intra_matrix[j] = v;
2009
            s->chroma_intra_matrix[j] = v;
2010
        }
2011
    }
2012
    if (get_bits1(&s->gb)) {
2013
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2014
    } else {
2015
        for(i=0;i<64;i++) {
2016
            int j= s->dsp.idct_permutation[i];
2017
            v = ff_mpeg1_default_non_intra_matrix[i];
2018
            s->inter_matrix[j] = v;
2019
            s->chroma_inter_matrix[j] = v;
2020
        }
2021
    }
2022

    
2023
    if(show_bits(&s->gb, 23) != 0){
2024
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2025
        return -1;
2026
    }
2027

    
2028
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2029
    s->progressive_sequence = 1;
2030
    s->progressive_frame = 1;
2031
    s->picture_structure = PICT_FRAME;
2032
    s->frame_pred_frame_dct = 1;
2033
    s->chroma_format = 1;
2034
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2035
    avctx->sub_id = 1; /* indicates MPEG-1 */
2036
    s->out_format = FMT_MPEG1;
2037
    s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2038
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2039

    
2040
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2041
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2042
               s->avctx->rc_buffer_size, s->bit_rate);
2043

    
2044
    return 0;
2045
}
2046

    
2047
static int vcr2_init_sequence(AVCodecContext *avctx)
2048
{
2049
    Mpeg1Context *s1 = avctx->priv_data;
2050
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2051
    int i, v;
2052

    
2053
    /* start new MPEG-1 context decoding */
2054
    s->out_format = FMT_MPEG1;
2055
    if (s1->mpeg_enc_ctx_allocated) {
2056
        MPV_common_end(s);
2057
    }
2058
    s->width  = avctx->coded_width;
2059
    s->height = avctx->coded_height;
2060
    avctx->has_b_frames= 0; //true?
2061
    s->low_delay= 1;
2062

    
2063
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2064
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2065

    
2066
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2067
        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2068
        if( avctx->idct_algo == FF_IDCT_AUTO )
2069
            avctx->idct_algo = FF_IDCT_SIMPLE;
2070

    
2071
    if (MPV_common_init(s) < 0)
2072
        return -1;
2073
    exchange_uv(s);//common init reset pblocks, so we swap them here
2074
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2075
    s1->mpeg_enc_ctx_allocated = 1;
2076

    
2077
    for(i=0;i<64;i++) {
2078
        int j= s->dsp.idct_permutation[i];
2079
        v = ff_mpeg1_default_intra_matrix[i];
2080
        s->intra_matrix[j] = v;
2081
        s->chroma_intra_matrix[j] = v;
2082

    
2083
        v = ff_mpeg1_default_non_intra_matrix[i];
2084
        s->inter_matrix[j] = v;
2085
        s->chroma_inter_matrix[j] = v;
2086
    }
2087

    
2088
    s->progressive_sequence = 1;
2089
    s->progressive_frame = 1;
2090
    s->picture_structure = PICT_FRAME;
2091
    s->frame_pred_frame_dct = 1;
2092
    s->chroma_format = 1;
2093
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2094
    avctx->sub_id = 2; /* indicates MPEG-2 */
2095
    s1->save_width           = s->width;
2096
    s1->save_height          = s->height;
2097
    s1->save_progressive_seq = s->progressive_sequence;
2098
    return 0;
2099
}
2100

    
2101

    
2102
static void mpeg_decode_user_data(AVCodecContext *avctx,
2103
                                  const uint8_t *p, int buf_size)
2104
{
2105
    const uint8_t *buf_end = p+buf_size;
2106

    
2107
    /* we parse the DTG active format information */
2108
    if (buf_end - p >= 5 &&
2109
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2110
        int flags = p[4];
2111
        p += 5;
2112
        if (flags & 0x80) {
2113
            /* skip event id */
2114
            p += 2;
2115
        }
2116
        if (flags & 0x40) {
2117
            if (buf_end - p < 1)
2118
                return;
2119
            avctx->dtg_active_format = p[0] & 0x0f;
2120
        }
2121
    }
2122
}
2123

    
2124
static void mpeg_decode_gop(AVCodecContext *avctx,
2125
                            const uint8_t *buf, int buf_size){
2126
    Mpeg1Context *s1 = avctx->priv_data;
2127
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2128

    
2129
    int drop_frame_flag;
2130
    int time_code_hours, time_code_minutes;
2131
    int time_code_seconds, time_code_pictures;
2132
    int broken_link;
2133

    
2134
    init_get_bits(&s->gb, buf, buf_size*8);
2135

    
2136
    drop_frame_flag = get_bits1(&s->gb);
2137

    
2138
    time_code_hours=get_bits(&s->gb,5);
2139
    time_code_minutes = get_bits(&s->gb,6);
2140
    skip_bits1(&s->gb);//marker bit
2141
    time_code_seconds = get_bits(&s->gb,6);
2142
    time_code_pictures = get_bits(&s->gb,6);
2143

    
2144
    s->closed_gop = get_bits1(&s->gb);
2145
    /*broken_link indicate that after editing the
2146
      reference frames of the first B-Frames after GOP I-Frame
2147
      are missing (open gop)*/
2148
    broken_link = get_bits1(&s->gb);
2149

    
2150
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2151
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2152
            time_code_hours, time_code_minutes, time_code_seconds,
2153
            time_code_pictures, s->closed_gop, broken_link);
2154
}
2155
/**
2156
 * Find the end of the current frame in the bitstream.
2157
 * @return the position of the first byte of the next frame, or -1
2158
 */
2159
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2160
{
2161
    int i;
2162
    uint32_t state= pc->state;
2163

    
2164
    /* EOF considered as end of frame */
2165
    if (buf_size == 0)
2166
        return 0;
2167

    
2168
/*
2169
 0  frame start         -> 1/4
2170
 1  first_SEQEXT        -> 0/2
2171
 2  first field start   -> 3/0
2172
 3  second_SEQEXT       -> 2/0
2173
 4  searching end
2174
*/
2175

    
2176
    for(i=0; i<buf_size; i++){
2177
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2178
        if(pc->frame_start_found&1){
2179
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2180
                pc->frame_start_found--;
2181
            else if(state == EXT_START_CODE+2){
2182
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2183
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2184
            }
2185
            state++;
2186
        }else{
2187
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2188
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2189
                i++;
2190
                pc->frame_start_found=4;
2191
            }
2192
            if(state == SEQ_END_CODE){
2193
                pc->state=-1;
2194
                return i+1;
2195
            }
2196
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2197
                pc->frame_start_found= 0;
2198
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2199
                pc->frame_start_found++;
2200
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2201
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2202
                    pc->frame_start_found=0;
2203
                    pc->state=-1;
2204
                    return i-3;
2205
                }
2206
            }
2207
            if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2208
                ff_fetch_timestamp(s, i-3, 1);
2209
            }
2210
        }
2211
    }
2212
    pc->state= state;
2213
    return END_NOT_FOUND;
2214
}
2215

    
2216
static int decode_chunks(AVCodecContext *avctx,
2217
                             AVFrame *picture, int *data_size,
2218
                             const uint8_t *buf, int buf_size);
2219

    
2220
/* handle buffering and image synchronisation */
2221
static int mpeg_decode_frame(AVCodecContext *avctx,
2222
                             void *data, int *data_size,
2223
                             AVPacket *avpkt)
2224
{
2225
    const uint8_t *buf = avpkt->data;
2226
    int buf_size = avpkt->size;
2227
    Mpeg1Context *s = avctx->priv_data;
2228
    AVFrame *picture = data;
2229
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2230
    av_dlog(avctx, "fill_buffer\n");
2231

    
2232
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2233
        /* special case for last picture */
2234
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2235
            *picture= *(AVFrame*)s2->next_picture_ptr;
2236
            s2->next_picture_ptr= NULL;
2237

    
2238
            *data_size = sizeof(AVFrame);
2239
        }
2240
        return buf_size;
2241
    }
2242

    
2243
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2244
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2245

    
2246
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2247
            return buf_size;
2248
    }
2249

    
2250
#if 0
2251
    if (s->repeat_field % 2 == 1) {
2252
        s->repeat_field++;
2253
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2254
        //        s2->picture_number, s->repeat_field);
2255
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2256
            *data_size = sizeof(AVPicture);
2257
            goto the_end;
2258
        }
2259
    }
2260
#endif
2261

    
2262
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2263
        vcr2_init_sequence(avctx);
2264

    
2265
    s->slice_count= 0;
2266

    
2267
    if(avctx->extradata && !avctx->frame_number)
2268
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2269

    
2270
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2271
}
2272

    
2273
static int decode_chunks(AVCodecContext *avctx,
2274
                             AVFrame *picture, int *data_size,
2275
                             const uint8_t *buf, int buf_size)
2276
{
2277
    Mpeg1Context *s = avctx->priv_data;
2278
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2279
    const uint8_t *buf_ptr = buf;
2280
    const uint8_t *buf_end = buf + buf_size;
2281
    int ret, input_size;
2282
    int last_code= 0;
2283

    
2284
    for(;;) {
2285
        /* find next start code */
2286
        uint32_t start_code = -1;
2287
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2288
        if (start_code > 0x1ff){
2289
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2290
                if(HAVE_THREADS && avctx->active_thread_type&FF_THREAD_SLICE){
2291
                    int i;
2292

    
2293
                    avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2294
                    for(i=0; i<s->slice_count; i++)
2295
                        s2->error_count += s2->thread_context[i]->error_count;
2296
                }
2297

    
2298
                if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2299
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2300

    
2301
                if (slice_end(avctx, picture)) {
2302
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2303
                        *data_size = sizeof(AVPicture);
2304
                }
2305
            }
2306
            s2->pict_type= 0;
2307
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2308
        }
2309

    
2310
        input_size = buf_end - buf_ptr;
2311

    
2312
        if(avctx->debug & FF_DEBUG_STARTCODE){
2313
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2314
        }
2315

    
2316
        /* prepare data for next start code */
2317
        switch(start_code) {
2318
        case SEQ_START_CODE:
2319
            if(last_code == 0){
2320
            mpeg1_decode_sequence(avctx, buf_ptr,
2321
                                    input_size);
2322
                s->sync=1;
2323
            }else{
2324
                av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2325
            }
2326
            break;
2327

    
2328
        case PICTURE_START_CODE:
2329
            if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2330
            if(mpeg_decode_postinit(avctx) < 0){
2331
                av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2332
                return -1;
2333
            }
2334

    
2335
            /* we have a complete image: we try to decompress it */
2336
            if(mpeg1_decode_picture(avctx,
2337
                                    buf_ptr, input_size) < 0)
2338
                s2->pict_type=0;
2339
                s2->first_slice = 1;
2340
            last_code= PICTURE_START_CODE;
2341
            }else{
2342
                av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2343
            }
2344
            break;
2345
        case EXT_START_CODE:
2346
            init_get_bits(&s2->gb, buf_ptr, input_size*8);
2347

    
2348
            switch(get_bits(&s2->gb, 4)) {
2349
            case 0x1:
2350
                if(last_code == 0){
2351
                mpeg_decode_sequence_extension(s);
2352
                }else{
2353
                    av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2354
                }
2355
                break;
2356
            case 0x2:
2357
                mpeg_decode_sequence_display_extension(s);
2358
                break;
2359
            case 0x3:
2360
                mpeg_decode_quant_matrix_extension(s2);
2361
                break;
2362
            case 0x7:
2363
                mpeg_decode_picture_display_extension(s);
2364
                break;
2365
            case 0x8:
2366
                if(last_code == PICTURE_START_CODE){
2367
                mpeg_decode_picture_coding_extension(s);
2368
                }else{
2369
                    av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2370
                }
2371
                break;
2372
            }
2373
            break;
2374
        case USER_START_CODE:
2375
            mpeg_decode_user_data(avctx,
2376
                                    buf_ptr, input_size);
2377
            break;
2378
        case GOP_START_CODE:
2379
            if(last_code == 0){
2380
            s2->first_field=0;
2381
            mpeg_decode_gop(avctx,
2382
                                    buf_ptr, input_size);
2383
                s->sync=1;
2384
            }else{
2385
                av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2386
            }
2387
            break;
2388
        default:
2389
            if (start_code >= SLICE_MIN_START_CODE &&
2390
                start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2391
                const int field_pic= s2->picture_structure != PICT_FRAME;
2392
                int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2393
                last_code= SLICE_MIN_START_CODE;
2394

    
2395
                if(s2->picture_structure == PICT_BOTTOM_FIELD)
2396
                    mb_y++;
2397

    
2398
                if (mb_y >= s2->mb_height){
2399
                    av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2400
                    return -1;
2401
                }
2402

    
2403
                if(s2->last_picture_ptr==NULL){
2404
                /* Skip B-frames if we do not have reference frames and gop is not closed */
2405
                    if(s2->pict_type==FF_B_TYPE){
2406
                        if(!s2->closed_gop)
2407
                            break;
2408
                    }
2409
                }
2410
                if(s2->pict_type==FF_I_TYPE)
2411
                    s->sync=1;
2412
                if(s2->next_picture_ptr==NULL){
2413
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2414
                    if(s2->pict_type==FF_P_TYPE && !s->sync) break;
2415
                }
2416
                /* Skip B-frames if we are in a hurry. */
2417
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2418
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2419
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2420
                    || avctx->skip_frame >= AVDISCARD_ALL)
2421
                    break;
2422
                /* Skip everything if we are in a hurry>=5. */
2423
                if(avctx->hurry_up>=5) break;
2424

    
2425
                if (!s->mpeg_enc_ctx_allocated) break;
2426

    
2427
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2428
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2429
                        break;
2430
                }
2431

    
2432
                if(!s2->pict_type){
2433
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2434
                    break;
2435
                }
2436

    
2437
                if(s2->first_slice){
2438
                    s2->first_slice=0;
2439
                    if(mpeg_field_start(s2, buf, buf_size) < 0)
2440
                        return -1;
2441
                }
2442
                if(!s2->current_picture_ptr){
2443
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2444
                    return -1;
2445
                }
2446

    
2447
                if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2448
                    s->slice_count++;
2449
                    break;
2450
                }
2451

    
2452
                if(HAVE_THREADS && avctx->active_thread_type&FF_THREAD_SLICE){
2453
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2454
                    if(threshold <= mb_y){
2455
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2456

    
2457
                        thread_context->start_mb_y= mb_y;
2458
                        thread_context->end_mb_y  = s2->mb_height;
2459
                        if(s->slice_count){
2460
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2461
                            ff_update_duplicate_context(thread_context, s2);
2462
                        }
2463
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2464
                        s->slice_count++;
2465
                    }
2466
                    buf_ptr += 2; //FIXME add minimum number of bytes per slice
2467
                }else{
2468
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2469
                    emms_c();
2470

    
2471
                    if(ret < 0){
2472
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2473
                            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);
2474
                    }else{
2475
                        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);
2476
                    }
2477
                }
2478
            }
2479
            break;
2480
        }
2481
    }
2482
}
2483

    
2484
static void flush(AVCodecContext *avctx){
2485
    Mpeg1Context *s = avctx->priv_data;
2486

    
2487
    s->sync=0;
2488

    
2489
    ff_mpeg_flush(avctx);
2490
}
2491

    
2492
static int mpeg_decode_end(AVCodecContext *avctx)
2493
{
2494
    Mpeg1Context *s = avctx->priv_data;
2495

    
2496
    if (s->mpeg_enc_ctx_allocated)
2497
        MPV_common_end(&s->mpeg_enc_ctx);
2498
    return 0;
2499
}
2500

    
2501
static const AVProfile mpeg2_video_profiles[] = {
2502
    { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2503
    { FF_PROFILE_MPEG2_HIGH,         "High"               },
2504
    { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2505
    { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2506
    { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2507
    { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2508
    { FF_PROFILE_RESERVED,           "Reserved"           },
2509
    { FF_PROFILE_RESERVED,           "Reserved"           },
2510
};
2511

    
2512

    
2513
AVCodec ff_mpeg1video_decoder = {
2514
    "mpeg1video",
2515
    AVMEDIA_TYPE_VIDEO,
2516
    CODEC_ID_MPEG1VIDEO,
2517
    sizeof(Mpeg1Context),
2518
    mpeg_decode_init,
2519
    NULL,
2520
    mpeg_decode_end,
2521
    mpeg_decode_frame,
2522
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2523
    .flush= flush,
2524
    .max_lowres= 3,
2525
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2526
    .update_thread_context= ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2527
};
2528

    
2529
AVCodec ff_mpeg2video_decoder = {
2530
    "mpeg2video",
2531
    AVMEDIA_TYPE_VIDEO,
2532
    CODEC_ID_MPEG2VIDEO,
2533
    sizeof(Mpeg1Context),
2534
    mpeg_decode_init,
2535
    NULL,
2536
    mpeg_decode_end,
2537
    mpeg_decode_frame,
2538
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2539
    .flush= flush,
2540
    .max_lowres= 3,
2541
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2542
    .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2543
};
2544

    
2545
//legacy decoder
2546
AVCodec ff_mpegvideo_decoder = {
2547
    "mpegvideo",
2548
    AVMEDIA_TYPE_VIDEO,
2549
    CODEC_ID_MPEG2VIDEO,
2550
    sizeof(Mpeg1Context),
2551
    mpeg_decode_init,
2552
    NULL,
2553
    mpeg_decode_end,
2554
    mpeg_decode_frame,
2555
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2556
    .flush= flush,
2557
    .max_lowres= 3,
2558
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2559
};
2560

    
2561
#if CONFIG_MPEG_XVMC_DECODER
2562
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2563
    if( avctx->active_thread_type & FF_THREAD_SLICE )
2564
        return -1;
2565
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2566
        return -1;
2567
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2568
        av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2569
    }
2570
    mpeg_decode_init(avctx);
2571

    
2572
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2573
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2574

    
2575
    return 0;
2576
}
2577

    
2578
AVCodec ff_mpeg_xvmc_decoder = {
2579
    "mpegvideo_xvmc",
2580
    AVMEDIA_TYPE_VIDEO,
2581
    CODEC_ID_MPEG2VIDEO_XVMC,
2582
    sizeof(Mpeg1Context),
2583
    mpeg_mc_decode_init,
2584
    NULL,
2585
    mpeg_decode_end,
2586
    mpeg_decode_frame,
2587
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2588
    .flush= flush,
2589
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2590
};
2591

    
2592
#endif
2593

    
2594
#if CONFIG_MPEG_VDPAU_DECODER
2595
AVCodec ff_mpeg_vdpau_decoder = {
2596
    "mpegvideo_vdpau",
2597
    AVMEDIA_TYPE_VIDEO,
2598
    CODEC_ID_MPEG2VIDEO,
2599
    sizeof(Mpeg1Context),
2600
    mpeg_decode_init,
2601
    NULL,
2602
    mpeg_decode_end,
2603
    mpeg_decode_frame,
2604
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2605
    .flush= flush,
2606
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2607
};
2608
#endif
2609

    
2610
#if CONFIG_MPEG1_VDPAU_DECODER
2611
AVCodec ff_mpeg1_vdpau_decoder = {
2612
    "mpeg1video_vdpau",
2613
    AVMEDIA_TYPE_VIDEO,
2614
    CODEC_ID_MPEG1VIDEO,
2615
    sizeof(Mpeg1Context),
2616
    mpeg_decode_init,
2617
    NULL,
2618
    mpeg_decode_end,
2619
    mpeg_decode_frame,
2620
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2621
    .flush= flush,
2622
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2623
};
2624
#endif
2625