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ffmpeg / libavcodec / mpeg12.c @ 72415b2a

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

    
23
/**
24
 * @file libavcodec/mpeg12.c
25
 * MPEG-1/2 decoder
26
 */
27

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

    
34
#include "mpeg12.h"
35
#include "mpeg12data.h"
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#include "mpeg12decdata.h"
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#include "bytestream.h"
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#include "vdpau_internal.h"
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#include "xvmc_internal.h"
40

    
41
//#undef NDEBUG
42
//#include <assert.h>
43

    
44

    
45
#define MV_VLC_BITS 9
46
#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
50

    
51
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
53
                              int n);
54
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
56
                              int n);
57
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
58
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
60
                                        int n);
61
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
63
                                    int n);
64
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
65
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
66
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
67
static void exchange_uv(MpegEncContext *s);
68

    
69
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
70
                                           PIX_FMT_XVMC_MPEG2_IDCT,
71
                                           PIX_FMT_XVMC_MPEG2_MC,
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                                           PIX_FMT_NONE};
73

    
74
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
75

    
76

    
77
#define INIT_2D_VLC_RL(rl, static_size)\
78
{\
79
    static RL_VLC_ELEM rl_vlc_table[static_size];\
80
    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
81
             &rl.table_vlc[0][1], 4, 2,\
82
             &rl.table_vlc[0][0], 4, 2, static_size);\
83
\
84
    rl.rl_vlc[0]= rl_vlc_table;\
85
    init_2d_vlc_rl(&rl);\
86
}
87

    
88
static void init_2d_vlc_rl(RLTable *rl)
89
{
90
    int i;
91

    
92
    for(i=0; i<rl->vlc.table_size; i++){
93
        int code= rl->vlc.table[i][0];
94
        int len = rl->vlc.table[i][1];
95
        int level, run;
96

    
97
        if(len==0){ // illegal code
98
            run= 65;
99
            level= MAX_LEVEL;
100
        }else if(len<0){ //more bits needed
101
            run= 0;
102
            level= code;
103
        }else{
104
            if(code==rl->n){ //esc
105
                run= 65;
106
                level= 0;
107
            }else if(code==rl->n+1){ //eob
108
                run= 0;
109
                level= 127;
110
            }else{
111
                run=   rl->table_run  [code] + 1;
112
                level= rl->table_level[code];
113
            }
114
        }
115
        rl->rl_vlc[0][i].len= len;
116
        rl->rl_vlc[0][i].level= level;
117
        rl->rl_vlc[0][i].run= run;
118
    }
119
}
120

    
121
void ff_mpeg12_common_init(MpegEncContext *s)
122
{
123

    
124
    s->y_dc_scale_table=
125
    s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
126

    
127
}
128

    
129
void ff_mpeg1_clean_buffers(MpegEncContext *s){
130
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
131
    s->last_dc[1] = s->last_dc[0];
132
    s->last_dc[2] = s->last_dc[0];
133
    memset(s->last_mv, 0, sizeof(s->last_mv));
134
}
135

    
136

    
137
/******************************************/
138
/* decoding */
139

    
140
static VLC mv_vlc;
141
static VLC mbincr_vlc;
142
static VLC mb_ptype_vlc;
143
static VLC mb_btype_vlc;
144
static VLC mb_pat_vlc;
145

    
146
av_cold void ff_mpeg12_init_vlcs(void)
147
{
148
    static int done = 0;
149

    
150
    if (!done) {
151
        done = 1;
152

    
153
        INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
154
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
155
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
156
        INIT_VLC_STATIC(&dc_chroma_vlc,  DC_VLC_BITS, 12,
157
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
158
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
159
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
160
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
161
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
162
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
163
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
164
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
165
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
166
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
167
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
168

    
169
        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
170
                 &table_mb_ptype[0][1], 2, 1,
171
                 &table_mb_ptype[0][0], 2, 1, 64);
172
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
173
                 &table_mb_btype[0][1], 2, 1,
174
                 &table_mb_btype[0][0], 2, 1, 64);
175
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
176
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
177

    
178
        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
179
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
180
    }
181
}
182

    
183
static inline int get_dmv(MpegEncContext *s)
184
{
185
    if(get_bits1(&s->gb))
186
        return 1 - (get_bits1(&s->gb) << 1);
187
    else
188
        return 0;
189
}
190

    
191
static inline int get_qscale(MpegEncContext *s)
192
{
193
    int qscale = get_bits(&s->gb, 5);
194
    if (s->q_scale_type) {
195
        return non_linear_qscale[qscale];
196
    } else {
197
        return qscale << 1;
198
    }
199
}
200

    
201
/* motion type (for MPEG-2) */
202
#define MT_FIELD 1
203
#define MT_FRAME 2
204
#define MT_16X8  2
205
#define MT_DMV   3
206

    
207
static int mpeg_decode_mb(MpegEncContext *s,
208
                          DCTELEM block[12][64])
209
{
210
    int i, j, k, cbp, val, mb_type, motion_type;
211
    const int mb_block_count = 4 + (1<< s->chroma_format);
212

    
213
    dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
214

    
215
    assert(s->mb_skipped==0);
216

    
217
    if (s->mb_skip_run-- != 0) {
218
        if (s->pict_type == FF_P_TYPE) {
219
            s->mb_skipped = 1;
220
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
221
        } else {
222
            int mb_type;
223

    
224
            if(s->mb_x)
225
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
226
            else
227
                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
228
            if(IS_INTRA(mb_type))
229
                return -1;
230

    
231
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
232
                mb_type | MB_TYPE_SKIP;
233
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
234

    
235
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
236
                s->mb_skipped = 1;
237
        }
238

    
239
        return 0;
240
    }
241

    
242
    switch(s->pict_type) {
243
    default:
244
    case FF_I_TYPE:
245
        if (get_bits1(&s->gb) == 0) {
246
            if (get_bits1(&s->gb) == 0){
247
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
248
                return -1;
249
            }
250
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
251
        } else {
252
            mb_type = MB_TYPE_INTRA;
253
        }
254
        break;
255
    case FF_P_TYPE:
256
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
257
        if (mb_type < 0){
258
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
259
            return -1;
260
        }
261
        mb_type = ptype2mb_type[ mb_type ];
262
        break;
263
    case FF_B_TYPE:
264
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
265
        if (mb_type < 0){
266
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
267
            return -1;
268
        }
269
        mb_type = btype2mb_type[ mb_type ];
270
        break;
271
    }
272
    dprintf(s->avctx, "mb_type=%x\n", mb_type);
273
//    motion_type = 0; /* avoid warning */
274
    if (IS_INTRA(mb_type)) {
275
        s->dsp.clear_blocks(s->block[0]);
276

    
277
        if(!s->chroma_y_shift){
278
            s->dsp.clear_blocks(s->block[6]);
279
        }
280

    
281
        /* compute DCT type */
282
        if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
283
            !s->frame_pred_frame_dct) {
284
            s->interlaced_dct = get_bits1(&s->gb);
285
        }
286

    
287
        if (IS_QUANT(mb_type))
288
            s->qscale = get_qscale(s);
289

    
290
        if (s->concealment_motion_vectors) {
291
            /* just parse them */
292
            if (s->picture_structure != PICT_FRAME)
293
                skip_bits1(&s->gb); /* field select */
294

    
295
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
296
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
297
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
298
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
299

    
300
            skip_bits1(&s->gb); /* marker */
301
        }else
302
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
303
        s->mb_intra = 1;
304
        //if 1, we memcpy blocks in xvmcvideo
305
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
306
            ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
307
            if(s->swap_uv){
308
                exchange_uv(s);
309
            }
310
        }
311

    
312
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
313
            if(s->flags2 & CODEC_FLAG2_FAST){
314
                for(i=0;i<6;i++) {
315
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
316
                }
317
            }else{
318
                for(i=0;i<mb_block_count;i++) {
319
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
320
                        return -1;
321
                }
322
            }
323
        } else {
324
            for(i=0;i<6;i++) {
325
                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
326
                    return -1;
327
            }
328
        }
329
    } else {
330
        if (mb_type & MB_TYPE_ZERO_MV){
331
            assert(mb_type & MB_TYPE_CBP);
332

    
333
            s->mv_dir = MV_DIR_FORWARD;
334
            if(s->picture_structure == PICT_FRAME){
335
                if(!s->frame_pred_frame_dct)
336
                    s->interlaced_dct = get_bits1(&s->gb);
337
                s->mv_type = MV_TYPE_16X16;
338
            }else{
339
                s->mv_type = MV_TYPE_FIELD;
340
                mb_type |= MB_TYPE_INTERLACED;
341
                s->field_select[0][0]= s->picture_structure - 1;
342
            }
343

    
344
            if (IS_QUANT(mb_type))
345
                s->qscale = get_qscale(s);
346

    
347
            s->last_mv[0][0][0] = 0;
348
            s->last_mv[0][0][1] = 0;
349
            s->last_mv[0][1][0] = 0;
350
            s->last_mv[0][1][1] = 0;
351
            s->mv[0][0][0] = 0;
352
            s->mv[0][0][1] = 0;
353
        }else{
354
            assert(mb_type & MB_TYPE_L0L1);
355
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
356
            /* get additional motion vector type */
357
            if (s->frame_pred_frame_dct)
358
                motion_type = MT_FRAME;
359
            else{
360
                motion_type = get_bits(&s->gb, 2);
361
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
362
                    s->interlaced_dct = get_bits1(&s->gb);
363
            }
364

    
365
            if (IS_QUANT(mb_type))
366
                s->qscale = get_qscale(s);
367

    
368
            /* motion vectors */
369
            s->mv_dir= (mb_type>>13)&3;
370
            dprintf(s->avctx, "motion_type=%d\n", motion_type);
371
            switch(motion_type) {
372
            case MT_FRAME: /* or MT_16X8 */
373
                if (s->picture_structure == PICT_FRAME) {
374
                    mb_type |= MB_TYPE_16x16;
375
                    s->mv_type = MV_TYPE_16X16;
376
                    for(i=0;i<2;i++) {
377
                        if (USES_LIST(mb_type, i)) {
378
                            /* MT_FRAME */
379
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
380
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
381
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
382
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
383
                            /* full_pel: only for MPEG-1 */
384
                            if (s->full_pel[i]){
385
                                s->mv[i][0][0] <<= 1;
386
                                s->mv[i][0][1] <<= 1;
387
                            }
388
                        }
389
                    }
390
                } else {
391
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
392
                    s->mv_type = MV_TYPE_16X8;
393
                    for(i=0;i<2;i++) {
394
                        if (USES_LIST(mb_type, i)) {
395
                            /* MT_16X8 */
396
                            for(j=0;j<2;j++) {
397
                                s->field_select[i][j] = get_bits1(&s->gb);
398
                                for(k=0;k<2;k++) {
399
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
400
                                                             s->last_mv[i][j][k]);
401
                                    s->last_mv[i][j][k] = val;
402
                                    s->mv[i][j][k] = val;
403
                                }
404
                            }
405
                        }
406
                    }
407
                }
408
                break;
409
            case MT_FIELD:
410
                s->mv_type = MV_TYPE_FIELD;
411
                if (s->picture_structure == PICT_FRAME) {
412
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
413
                    for(i=0;i<2;i++) {
414
                        if (USES_LIST(mb_type, i)) {
415
                            for(j=0;j<2;j++) {
416
                                s->field_select[i][j] = get_bits1(&s->gb);
417
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
418
                                                         s->last_mv[i][j][0]);
419
                                s->last_mv[i][j][0] = val;
420
                                s->mv[i][j][0] = val;
421
                                dprintf(s->avctx, "fmx=%d\n", val);
422
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
423
                                                         s->last_mv[i][j][1] >> 1);
424
                                s->last_mv[i][j][1] = val << 1;
425
                                s->mv[i][j][1] = val;
426
                                dprintf(s->avctx, "fmy=%d\n", val);
427
                            }
428
                        }
429
                    }
430
                } else {
431
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
432
                    for(i=0;i<2;i++) {
433
                        if (USES_LIST(mb_type, i)) {
434
                            s->field_select[i][0] = get_bits1(&s->gb);
435
                            for(k=0;k<2;k++) {
436
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
437
                                                         s->last_mv[i][0][k]);
438
                                s->last_mv[i][0][k] = val;
439
                                s->last_mv[i][1][k] = val;
440
                                s->mv[i][0][k] = val;
441
                            }
442
                        }
443
                    }
444
                }
445
                break;
446
            case MT_DMV:
447
                s->mv_type = MV_TYPE_DMV;
448
                for(i=0;i<2;i++) {
449
                    if (USES_LIST(mb_type, i)) {
450
                        int dmx, dmy, mx, my, m;
451
                        const int my_shift= s->picture_structure == PICT_FRAME;
452

    
453
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
454
                                                s->last_mv[i][0][0]);
455
                        s->last_mv[i][0][0] = mx;
456
                        s->last_mv[i][1][0] = mx;
457
                        dmx = get_dmv(s);
458
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
459
                                                s->last_mv[i][0][1] >> my_shift);
460
                        dmy = get_dmv(s);
461

    
462

    
463
                        s->last_mv[i][0][1] = my<<my_shift;
464
                        s->last_mv[i][1][1] = my<<my_shift;
465

    
466
                        s->mv[i][0][0] = mx;
467
                        s->mv[i][0][1] = my;
468
                        s->mv[i][1][0] = mx;//not used
469
                        s->mv[i][1][1] = my;//not used
470

    
471
                        if (s->picture_structure == PICT_FRAME) {
472
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
473

    
474
                            //m = 1 + 2 * s->top_field_first;
475
                            m = s->top_field_first ? 1 : 3;
476

    
477
                            /* top -> top pred */
478
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
479
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
480
                            m = 4 - m;
481
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
483
                        } else {
484
                            mb_type |= MB_TYPE_16x16;
485

    
486
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
487
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
488
                            if(s->picture_structure == PICT_TOP_FIELD)
489
                                s->mv[i][2][1]--;
490
                            else
491
                                s->mv[i][2][1]++;
492
                        }
493
                    }
494
                }
495
                break;
496
            default:
497
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
498
                return -1;
499
            }
500
        }
501

    
502
        s->mb_intra = 0;
503
        if (HAS_CBP(mb_type)) {
504
            s->dsp.clear_blocks(s->block[0]);
505

    
506
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
507
            if(mb_block_count > 6){
508
                 cbp<<= mb_block_count-6;
509
                 cbp |= get_bits(&s->gb, mb_block_count-6);
510
                 s->dsp.clear_blocks(s->block[6]);
511
            }
512
            if (cbp <= 0){
513
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
514
                return -1;
515
            }
516

    
517
            //if 1, we memcpy blocks in xvmcvideo
518
            if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
519
                ff_xvmc_pack_pblocks(s,cbp);
520
                if(s->swap_uv){
521
                    exchange_uv(s);
522
                }
523
            }
524

    
525
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
526
                if(s->flags2 & CODEC_FLAG2_FAST){
527
                    for(i=0;i<6;i++) {
528
                        if(cbp & 32) {
529
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
530
                        } else {
531
                            s->block_last_index[i] = -1;
532
                        }
533
                        cbp+=cbp;
534
                    }
535
                }else{
536
                    cbp<<= 12-mb_block_count;
537

    
538
                    for(i=0;i<mb_block_count;i++) {
539
                        if ( cbp & (1<<11) ) {
540
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
541
                                return -1;
542
                        } else {
543
                            s->block_last_index[i] = -1;
544
                        }
545
                        cbp+=cbp;
546
                    }
547
                }
548
            } else {
549
                if(s->flags2 & CODEC_FLAG2_FAST){
550
                    for(i=0;i<6;i++) {
551
                        if (cbp & 32) {
552
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
553
                        } else {
554
                            s->block_last_index[i] = -1;
555
                        }
556
                        cbp+=cbp;
557
                    }
558
                }else{
559
                    for(i=0;i<6;i++) {
560
                        if (cbp & 32) {
561
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
562
                                return -1;
563
                        } else {
564
                            s->block_last_index[i] = -1;
565
                        }
566
                        cbp+=cbp;
567
                    }
568
                }
569
            }
570
        }else{
571
            for(i=0;i<12;i++)
572
                s->block_last_index[i] = -1;
573
        }
574
    }
575

    
576
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
577

    
578
    return 0;
579
}
580

    
581
/* as H.263, but only 17 codes */
582
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
583
{
584
    int code, sign, val, l, shift;
585

    
586
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
587
    if (code == 0) {
588
        return pred;
589
    }
590
    if (code < 0) {
591
        return 0xffff;
592
    }
593

    
594
    sign = get_bits1(&s->gb);
595
    shift = fcode - 1;
596
    val = code;
597
    if (shift) {
598
        val = (val - 1) << shift;
599
        val |= get_bits(&s->gb, shift);
600
        val++;
601
    }
602
    if (sign)
603
        val = -val;
604
    val += pred;
605

    
606
    /* modulo decoding */
607
    l= INT_BIT - 5 - shift;
608
    val = (val<<l)>>l;
609
    return val;
610
}
611

    
612
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
613
                               DCTELEM *block,
614
                               int n)
615
{
616
    int level, dc, diff, i, j, run;
617
    int component;
618
    RLTable *rl = &ff_rl_mpeg1;
619
    uint8_t * const scantable= s->intra_scantable.permutated;
620
    const uint16_t *quant_matrix= s->intra_matrix;
621
    const int qscale= s->qscale;
622

    
623
    /* DC coefficient */
624
    component = (n <= 3 ? 0 : n - 4 + 1);
625
    diff = decode_dc(&s->gb, component);
626
    if (diff >= 0xffff)
627
        return -1;
628
    dc = s->last_dc[component];
629
    dc += diff;
630
    s->last_dc[component] = dc;
631
    block[0] = dc*quant_matrix[0];
632
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
633
    i = 0;
634
    {
635
        OPEN_READER(re, &s->gb);
636
        /* now quantify & encode AC coefficients */
637
        for(;;) {
638
            UPDATE_CACHE(re, &s->gb);
639
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
640

    
641
            if(level == 127){
642
                break;
643
            } else if(level != 0) {
644
                i += run;
645
                j = scantable[i];
646
                level= (level*qscale*quant_matrix[j])>>4;
647
                level= (level-1)|1;
648
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
649
                LAST_SKIP_BITS(re, &s->gb, 1);
650
            } else {
651
                /* escape */
652
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
653
                UPDATE_CACHE(re, &s->gb);
654
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
655
                if (level == -128) {
656
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
657
                } else if (level == 0) {
658
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
659
                }
660
                i += run;
661
                j = scantable[i];
662
                if(level<0){
663
                    level= -level;
664
                    level= (level*qscale*quant_matrix[j])>>4;
665
                    level= (level-1)|1;
666
                    level= -level;
667
                }else{
668
                    level= (level*qscale*quant_matrix[j])>>4;
669
                    level= (level-1)|1;
670
                }
671
            }
672
            if (i > 63){
673
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
674
                return -1;
675
            }
676

    
677
            block[j] = level;
678
        }
679
        CLOSE_READER(re, &s->gb);
680
    }
681
    s->block_last_index[n] = i;
682
   return 0;
683
}
684

    
685
int ff_mpeg1_decode_block_intra(MpegEncContext *s,
686
                                DCTELEM *block,
687
                                int n)
688
{
689
    return mpeg1_decode_block_intra(s, block, n);
690
}
691

    
692
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
693
                               DCTELEM *block,
694
                               int n)
695
{
696
    int level, i, j, run;
697
    RLTable *rl = &ff_rl_mpeg1;
698
    uint8_t * const scantable= s->intra_scantable.permutated;
699
    const uint16_t *quant_matrix= s->inter_matrix;
700
    const int qscale= s->qscale;
701

    
702
    {
703
        OPEN_READER(re, &s->gb);
704
        i = -1;
705
        // special case for first coefficient, no need to add second VLC table
706
        UPDATE_CACHE(re, &s->gb);
707
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
708
            level= (3*qscale*quant_matrix[0])>>5;
709
            level= (level-1)|1;
710
            if(GET_CACHE(re, &s->gb)&0x40000000)
711
                level= -level;
712
            block[0] = level;
713
            i++;
714
            SKIP_BITS(re, &s->gb, 2);
715
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
716
                goto end;
717
        }
718
#if MIN_CACHE_BITS < 19
719
        UPDATE_CACHE(re, &s->gb);
720
#endif
721
        /* now quantify & encode AC coefficients */
722
        for(;;) {
723
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
724

    
725
            if(level != 0) {
726
                i += run;
727
                j = scantable[i];
728
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
729
                level= (level-1)|1;
730
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
731
                SKIP_BITS(re, &s->gb, 1);
732
            } else {
733
                /* escape */
734
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
735
                UPDATE_CACHE(re, &s->gb);
736
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
737
                if (level == -128) {
738
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
739
                } else if (level == 0) {
740
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
741
                }
742
                i += run;
743
                j = scantable[i];
744
                if(level<0){
745
                    level= -level;
746
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
747
                    level= (level-1)|1;
748
                    level= -level;
749
                }else{
750
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
751
                    level= (level-1)|1;
752
                }
753
            }
754
            if (i > 63){
755
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
756
                return -1;
757
            }
758

    
759
            block[j] = level;
760
#if MIN_CACHE_BITS < 19
761
            UPDATE_CACHE(re, &s->gb);
762
#endif
763
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
764
                break;
765
#if MIN_CACHE_BITS >= 19
766
            UPDATE_CACHE(re, &s->gb);
767
#endif
768
        }
769
end:
770
        LAST_SKIP_BITS(re, &s->gb, 2);
771
        CLOSE_READER(re, &s->gb);
772
    }
773
    s->block_last_index[n] = i;
774
    return 0;
775
}
776

    
777
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
778
{
779
    int level, i, j, run;
780
    RLTable *rl = &ff_rl_mpeg1;
781
    uint8_t * const scantable= s->intra_scantable.permutated;
782
    const int qscale= s->qscale;
783

    
784
    {
785
        OPEN_READER(re, &s->gb);
786
        i = -1;
787
        // special case for first coefficient, no need to add second VLC table
788
        UPDATE_CACHE(re, &s->gb);
789
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
790
            level= (3*qscale)>>1;
791
            level= (level-1)|1;
792
            if(GET_CACHE(re, &s->gb)&0x40000000)
793
                level= -level;
794
            block[0] = level;
795
            i++;
796
            SKIP_BITS(re, &s->gb, 2);
797
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
798
                goto end;
799
        }
800
#if MIN_CACHE_BITS < 19
801
        UPDATE_CACHE(re, &s->gb);
802
#endif
803

    
804
        /* now quantify & encode AC coefficients */
805
        for(;;) {
806
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
807

    
808
            if(level != 0) {
809
                i += run;
810
                j = scantable[i];
811
                level= ((level*2+1)*qscale)>>1;
812
                level= (level-1)|1;
813
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
814
                SKIP_BITS(re, &s->gb, 1);
815
            } else {
816
                /* escape */
817
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
818
                UPDATE_CACHE(re, &s->gb);
819
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
820
                if (level == -128) {
821
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
822
                } else if (level == 0) {
823
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
824
                }
825
                i += run;
826
                j = scantable[i];
827
                if(level<0){
828
                    level= -level;
829
                    level= ((level*2+1)*qscale)>>1;
830
                    level= (level-1)|1;
831
                    level= -level;
832
                }else{
833
                    level= ((level*2+1)*qscale)>>1;
834
                    level= (level-1)|1;
835
                }
836
            }
837

    
838
            block[j] = level;
839
#if MIN_CACHE_BITS < 19
840
            UPDATE_CACHE(re, &s->gb);
841
#endif
842
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
843
                break;
844
#if MIN_CACHE_BITS >= 19
845
            UPDATE_CACHE(re, &s->gb);
846
#endif
847
        }
848
end:
849
        LAST_SKIP_BITS(re, &s->gb, 2);
850
        CLOSE_READER(re, &s->gb);
851
    }
852
    s->block_last_index[n] = i;
853
    return 0;
854
}
855

    
856

    
857
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
858
                               DCTELEM *block,
859
                               int n)
860
{
861
    int level, i, j, run;
862
    RLTable *rl = &ff_rl_mpeg1;
863
    uint8_t * const scantable= s->intra_scantable.permutated;
864
    const uint16_t *quant_matrix;
865
    const int qscale= s->qscale;
866
    int mismatch;
867

    
868
    mismatch = 1;
869

    
870
    {
871
        OPEN_READER(re, &s->gb);
872
        i = -1;
873
        if (n < 4)
874
            quant_matrix = s->inter_matrix;
875
        else
876
            quant_matrix = s->chroma_inter_matrix;
877

    
878
        // special case for first coefficient, no need to add second VLC table
879
        UPDATE_CACHE(re, &s->gb);
880
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
881
            level= (3*qscale*quant_matrix[0])>>5;
882
            if(GET_CACHE(re, &s->gb)&0x40000000)
883
                level= -level;
884
            block[0] = level;
885
            mismatch ^= level;
886
            i++;
887
            SKIP_BITS(re, &s->gb, 2);
888
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
889
                goto end;
890
        }
891
#if MIN_CACHE_BITS < 19
892
        UPDATE_CACHE(re, &s->gb);
893
#endif
894

    
895
        /* now quantify & encode AC coefficients */
896
        for(;;) {
897
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
898

    
899
            if(level != 0) {
900
                i += run;
901
                j = scantable[i];
902
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
904
                SKIP_BITS(re, &s->gb, 1);
905
            } else {
906
                /* escape */
907
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
908
                UPDATE_CACHE(re, &s->gb);
909
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
910

    
911
                i += run;
912
                j = scantable[i];
913
                if(level<0){
914
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
915
                    level= -level;
916
                }else{
917
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
918
                }
919
            }
920
            if (i > 63){
921
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
922
                return -1;
923
            }
924

    
925
            mismatch ^= level;
926
            block[j] = level;
927
#if MIN_CACHE_BITS < 19
928
            UPDATE_CACHE(re, &s->gb);
929
#endif
930
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
931
                break;
932
#if MIN_CACHE_BITS >= 19
933
            UPDATE_CACHE(re, &s->gb);
934
#endif
935
        }
936
end:
937
        LAST_SKIP_BITS(re, &s->gb, 2);
938
        CLOSE_READER(re, &s->gb);
939
    }
940
    block[63] ^= (mismatch & 1);
941

    
942
    s->block_last_index[n] = i;
943
    return 0;
944
}
945

    
946
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
947
                               DCTELEM *block,
948
                               int n)
949
{
950
    int level, i, j, run;
951
    RLTable *rl = &ff_rl_mpeg1;
952
    uint8_t * const scantable= s->intra_scantable.permutated;
953
    const int qscale= s->qscale;
954
    OPEN_READER(re, &s->gb);
955
    i = -1;
956

    
957
    // special case for first coefficient, no need to add second VLC table
958
    UPDATE_CACHE(re, &s->gb);
959
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
960
        level= (3*qscale)>>1;
961
        if(GET_CACHE(re, &s->gb)&0x40000000)
962
            level= -level;
963
        block[0] = level;
964
        i++;
965
        SKIP_BITS(re, &s->gb, 2);
966
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
967
            goto end;
968
    }
969
#if MIN_CACHE_BITS < 19
970
    UPDATE_CACHE(re, &s->gb);
971
#endif
972

    
973
    /* now quantify & encode AC coefficients */
974
    for(;;) {
975
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
976

    
977
        if(level != 0) {
978
            i += run;
979
            j = scantable[i];
980
            level= ((level*2+1)*qscale)>>1;
981
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
982
            SKIP_BITS(re, &s->gb, 1);
983
        } else {
984
            /* escape */
985
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
986
            UPDATE_CACHE(re, &s->gb);
987
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
988

    
989
            i += run;
990
            j = scantable[i];
991
            if(level<0){
992
                level= ((-level*2+1)*qscale)>>1;
993
                level= -level;
994
            }else{
995
                level= ((level*2+1)*qscale)>>1;
996
            }
997
        }
998

    
999
        block[j] = level;
1000
#if MIN_CACHE_BITS < 19
1001
        UPDATE_CACHE(re, &s->gb);
1002
#endif
1003
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1004
            break;
1005
#if MIN_CACHE_BITS >=19
1006
        UPDATE_CACHE(re, &s->gb);
1007
#endif
1008
    }
1009
end:
1010
    LAST_SKIP_BITS(re, &s->gb, 2);
1011
    CLOSE_READER(re, &s->gb);
1012
    s->block_last_index[n] = i;
1013
    return 0;
1014
}
1015

    
1016

    
1017
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1018
                               DCTELEM *block,
1019
                               int n)
1020
{
1021
    int level, dc, diff, i, j, run;
1022
    int component;
1023
    RLTable *rl;
1024
    uint8_t * const scantable= s->intra_scantable.permutated;
1025
    const uint16_t *quant_matrix;
1026
    const int qscale= s->qscale;
1027
    int mismatch;
1028

    
1029
    /* DC coefficient */
1030
    if (n < 4){
1031
        quant_matrix = s->intra_matrix;
1032
        component = 0;
1033
    }else{
1034
        quant_matrix = s->chroma_intra_matrix;
1035
        component = (n&1) + 1;
1036
    }
1037
    diff = decode_dc(&s->gb, component);
1038
    if (diff >= 0xffff)
1039
        return -1;
1040
    dc = s->last_dc[component];
1041
    dc += diff;
1042
    s->last_dc[component] = dc;
1043
    block[0] = dc << (3 - s->intra_dc_precision);
1044
    dprintf(s->avctx, "dc=%d\n", block[0]);
1045
    mismatch = block[0] ^ 1;
1046
    i = 0;
1047
    if (s->intra_vlc_format)
1048
        rl = &ff_rl_mpeg2;
1049
    else
1050
        rl = &ff_rl_mpeg1;
1051

    
1052
    {
1053
        OPEN_READER(re, &s->gb);
1054
        /* now quantify & encode AC coefficients */
1055
        for(;;) {
1056
            UPDATE_CACHE(re, &s->gb);
1057
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1058

    
1059
            if(level == 127){
1060
                break;
1061
            } else if(level != 0) {
1062
                i += run;
1063
                j = scantable[i];
1064
                level= (level*qscale*quant_matrix[j])>>4;
1065
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1066
                LAST_SKIP_BITS(re, &s->gb, 1);
1067
            } else {
1068
                /* escape */
1069
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1070
                UPDATE_CACHE(re, &s->gb);
1071
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1072
                i += run;
1073
                j = scantable[i];
1074
                if(level<0){
1075
                    level= (-level*qscale*quant_matrix[j])>>4;
1076
                    level= -level;
1077
                }else{
1078
                    level= (level*qscale*quant_matrix[j])>>4;
1079
                }
1080
            }
1081
            if (i > 63){
1082
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1083
                return -1;
1084
            }
1085

    
1086
            mismatch^= level;
1087
            block[j] = level;
1088
        }
1089
        CLOSE_READER(re, &s->gb);
1090
    }
1091
    block[63]^= mismatch&1;
1092

    
1093
    s->block_last_index[n] = i;
1094
    return 0;
1095
}
1096

    
1097
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1098
                               DCTELEM *block,
1099
                               int n)
1100
{
1101
    int level, dc, diff, j, run;
1102
    int component;
1103
    RLTable *rl;
1104
    uint8_t * scantable= s->intra_scantable.permutated;
1105
    const uint16_t *quant_matrix;
1106
    const int qscale= s->qscale;
1107

    
1108
    /* DC coefficient */
1109
    if (n < 4){
1110
        quant_matrix = s->intra_matrix;
1111
        component = 0;
1112
    }else{
1113
        quant_matrix = s->chroma_intra_matrix;
1114
        component = (n&1) + 1;
1115
    }
1116
    diff = decode_dc(&s->gb, component);
1117
    if (diff >= 0xffff)
1118
        return -1;
1119
    dc = s->last_dc[component];
1120
    dc += diff;
1121
    s->last_dc[component] = dc;
1122
    block[0] = dc << (3 - s->intra_dc_precision);
1123
    if (s->intra_vlc_format)
1124
        rl = &ff_rl_mpeg2;
1125
    else
1126
        rl = &ff_rl_mpeg1;
1127

    
1128
    {
1129
        OPEN_READER(re, &s->gb);
1130
        /* now quantify & encode AC coefficients */
1131
        for(;;) {
1132
            UPDATE_CACHE(re, &s->gb);
1133
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1134

    
1135
            if(level == 127){
1136
                break;
1137
            } else if(level != 0) {
1138
                scantable += run;
1139
                j = *scantable;
1140
                level= (level*qscale*quant_matrix[j])>>4;
1141
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1142
                LAST_SKIP_BITS(re, &s->gb, 1);
1143
            } else {
1144
                /* escape */
1145
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1146
                UPDATE_CACHE(re, &s->gb);
1147
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1148
                scantable += run;
1149
                j = *scantable;
1150
                if(level<0){
1151
                    level= (-level*qscale*quant_matrix[j])>>4;
1152
                    level= -level;
1153
                }else{
1154
                    level= (level*qscale*quant_matrix[j])>>4;
1155
                }
1156
            }
1157

    
1158
            block[j] = level;
1159
        }
1160
        CLOSE_READER(re, &s->gb);
1161
    }
1162

    
1163
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1164
    return 0;
1165
}
1166

    
1167
typedef struct Mpeg1Context {
1168
    MpegEncContext mpeg_enc_ctx;
1169
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1170
    int repeat_field; /* true if we must repeat the field */
1171
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1172
    int slice_count;
1173
    int swap_uv;//indicate VCR2
1174
    int save_aspect_info;
1175
    int save_width, save_height, save_progressive_seq;
1176
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1177
    int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1178
} Mpeg1Context;
1179

    
1180
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1181
{
1182
    Mpeg1Context *s = avctx->priv_data;
1183
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1184
    int i;
1185

    
1186
    /* we need some permutation to store matrices,
1187
     * until MPV_common_init() sets the real permutation. */
1188
    for(i=0;i<64;i++)
1189
       s2->dsp.idct_permutation[i]=i;
1190

    
1191
    MPV_decode_defaults(s2);
1192

    
1193
    s->mpeg_enc_ctx.avctx= avctx;
1194
    s->mpeg_enc_ctx.flags= avctx->flags;
1195
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1196
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1197
    ff_mpeg12_init_vlcs();
1198

    
1199
    s->mpeg_enc_ctx_allocated = 0;
1200
    s->mpeg_enc_ctx.picture_number = 0;
1201
    s->repeat_field = 0;
1202
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1203
    avctx->color_range= AVCOL_RANGE_MPEG;
1204
    if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1205
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1206
    else
1207
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1208
    return 0;
1209
}
1210

    
1211
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1212
                                     const uint8_t *new_perm){
1213
    uint16_t temp_matrix[64];
1214
    int i;
1215

    
1216
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1217

    
1218
    for(i=0;i<64;i++){
1219
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1220
    }
1221
}
1222

    
1223
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1224
    Mpeg1Context *s1 = avctx->priv_data;
1225
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1226

    
1227
    if(avctx->xvmc_acceleration)
1228
        return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1229
    else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1230
        if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1231
            return PIX_FMT_VDPAU_MPEG1;
1232
        else
1233
            return PIX_FMT_VDPAU_MPEG2;
1234
    }else{
1235
        if(s->chroma_format <  2)
1236
            return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1237
        else if(s->chroma_format == 2)
1238
            return PIX_FMT_YUV422P;
1239
        else
1240
            return PIX_FMT_YUV444P;
1241
    }
1242
}
1243

    
1244
/* Call this function when we know all parameters.
1245
 * It may be called in different places for MPEG-1 and MPEG-2. */
1246
static int mpeg_decode_postinit(AVCodecContext *avctx){
1247
    Mpeg1Context *s1 = avctx->priv_data;
1248
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1249
    uint8_t old_permutation[64];
1250

    
1251
    if (
1252
        (s1->mpeg_enc_ctx_allocated == 0)||
1253
        avctx->coded_width  != s->width ||
1254
        avctx->coded_height != s->height||
1255
        s1->save_width != s->width ||
1256
        s1->save_height != s->height ||
1257
        s1->save_aspect_info != s->aspect_ratio_info||
1258
        s1->save_progressive_seq != s->progressive_sequence ||
1259
        0)
1260
    {
1261

    
1262
        if (s1->mpeg_enc_ctx_allocated) {
1263
            ParseContext pc= s->parse_context;
1264
            s->parse_context.buffer=0;
1265
            MPV_common_end(s);
1266
            s->parse_context= pc;
1267
        }
1268

    
1269
        if( (s->width == 0 )||(s->height == 0))
1270
            return -2;
1271

    
1272
        avcodec_set_dimensions(avctx, s->width, s->height);
1273
        avctx->bit_rate = s->bit_rate;
1274
        s1->save_aspect_info = s->aspect_ratio_info;
1275
        s1->save_width = s->width;
1276
        s1->save_height = s->height;
1277
        s1->save_progressive_seq = s->progressive_sequence;
1278

    
1279
        /* low_delay may be forced, in this case we will have B-frames
1280
         * that behave like P-frames. */
1281
        avctx->has_b_frames = !(s->low_delay);
1282

    
1283
        assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1284
        if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1285
            //MPEG-1 fps
1286
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1287
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1288
            //MPEG-1 aspect
1289
            avctx->sample_aspect_ratio= av_d2q(
1290
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1291
            avctx->ticks_per_frame=1;
1292
        }else{//MPEG-2
1293
        //MPEG-2 fps
1294
            av_reduce(
1295
                &s->avctx->time_base.den,
1296
                &s->avctx->time_base.num,
1297
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1298
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1299
                1<<30);
1300
            avctx->ticks_per_frame=2;
1301
        //MPEG-2 aspect
1302
            if(s->aspect_ratio_info > 1){
1303
                //we ignore the spec here as reality does not match the spec, see for example
1304
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1305
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1306
                    s->avctx->sample_aspect_ratio=
1307
                        av_div_q(
1308
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1309
                         (AVRational){s->width, s->height}
1310
                         );
1311
                }else{
1312
                    s->avctx->sample_aspect_ratio=
1313
                        av_div_q(
1314
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1315
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1316
                        );
1317
                }
1318
            }else{
1319
                s->avctx->sample_aspect_ratio=
1320
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1321
            }
1322
        }//MPEG-2
1323

    
1324
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1325
        avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1326
        //until then pix_fmt may be changed right after codec init
1327
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1328
            avctx->hwaccel ||
1329
            s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1330
            if( avctx->idct_algo == FF_IDCT_AUTO )
1331
                avctx->idct_algo = FF_IDCT_SIMPLE;
1332

    
1333
        /* Quantization matrices may need reordering
1334
         * if DCT permutation is changed. */
1335
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1336

    
1337
        if (MPV_common_init(s) < 0)
1338
            return -2;
1339

    
1340
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1341
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1342
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1343
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1344

    
1345
        s1->mpeg_enc_ctx_allocated = 1;
1346
    }
1347
    return 0;
1348
}
1349

    
1350
static int mpeg1_decode_picture(AVCodecContext *avctx,
1351
                                const uint8_t *buf, int buf_size)
1352
{
1353
    Mpeg1Context *s1 = avctx->priv_data;
1354
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1355
    int ref, f_code, vbv_delay;
1356

    
1357
    init_get_bits(&s->gb, buf, buf_size*8);
1358

    
1359
    ref = get_bits(&s->gb, 10); /* temporal ref */
1360
    s->pict_type = get_bits(&s->gb, 3);
1361
    if(s->pict_type == 0 || s->pict_type > 3)
1362
        return -1;
1363

    
1364
    vbv_delay= get_bits(&s->gb, 16);
1365
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1366
        s->full_pel[0] = get_bits1(&s->gb);
1367
        f_code = get_bits(&s->gb, 3);
1368
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1369
            return -1;
1370
        s->mpeg_f_code[0][0] = f_code;
1371
        s->mpeg_f_code[0][1] = f_code;
1372
    }
1373
    if (s->pict_type == FF_B_TYPE) {
1374
        s->full_pel[1] = get_bits1(&s->gb);
1375
        f_code = get_bits(&s->gb, 3);
1376
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1377
            return -1;
1378
        s->mpeg_f_code[1][0] = f_code;
1379
        s->mpeg_f_code[1][1] = f_code;
1380
    }
1381
    s->current_picture.pict_type= s->pict_type;
1382
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1383

    
1384
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1385
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1386

    
1387
    s->y_dc_scale = 8;
1388
    s->c_dc_scale = 8;
1389
    return 0;
1390
}
1391

    
1392
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1393
{
1394
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1395
    int horiz_size_ext, vert_size_ext;
1396
    int bit_rate_ext;
1397

    
1398
    skip_bits(&s->gb, 1); /* profile and level esc*/
1399
    s->avctx->profile= get_bits(&s->gb, 3);
1400
    s->avctx->level= get_bits(&s->gb, 4);
1401
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1402
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1403
    horiz_size_ext = get_bits(&s->gb, 2);
1404
    vert_size_ext = get_bits(&s->gb, 2);
1405
    s->width |= (horiz_size_ext << 12);
1406
    s->height |= (vert_size_ext << 12);
1407
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1408
    s->bit_rate += (bit_rate_ext << 18) * 400;
1409
    skip_bits1(&s->gb); /* marker */
1410
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1411

    
1412
    s->low_delay = get_bits1(&s->gb);
1413
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1414

    
1415
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1416
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1417

    
1418
    dprintf(s->avctx, "sequence extension\n");
1419
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1420
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1421

    
1422
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1423
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1424
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1425

    
1426
}
1427

    
1428
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1429
{
1430
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1431
    int color_description, w, h;
1432

    
1433
    skip_bits(&s->gb, 3); /* video format */
1434
    color_description= get_bits1(&s->gb);
1435
    if(color_description){
1436
        s->avctx->color_primaries= get_bits(&s->gb, 8);
1437
        s->avctx->color_trc      = get_bits(&s->gb, 8);
1438
        s->avctx->colorspace     = get_bits(&s->gb, 8);
1439
    }
1440
    w= get_bits(&s->gb, 14);
1441
    skip_bits(&s->gb, 1); //marker
1442
    h= get_bits(&s->gb, 14);
1443
    skip_bits(&s->gb, 1); //marker
1444

    
1445
    s1->pan_scan.width= 16*w;
1446
    s1->pan_scan.height=16*h;
1447

    
1448
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1449
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1450
}
1451

    
1452
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1453
{
1454
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1455
    int i,nofco;
1456

    
1457
    nofco = 1;
1458
    if(s->progressive_sequence){
1459
        if(s->repeat_first_field){
1460
            nofco++;
1461
            if(s->top_field_first)
1462
                nofco++;
1463
        }
1464
    }else{
1465
        if(s->picture_structure == PICT_FRAME){
1466
            nofco++;
1467
            if(s->repeat_first_field)
1468
                nofco++;
1469
        }
1470
    }
1471
    for(i=0; i<nofco; i++){
1472
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1473
        skip_bits(&s->gb, 1); //marker
1474
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1475
        skip_bits(&s->gb, 1); //marker
1476
    }
1477

    
1478
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1479
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1480
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1481
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1482
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1483
        );
1484
}
1485

    
1486
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1487
    int i;
1488

    
1489
    for(i=0; i<64; i++) {
1490
        int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1491
        int v = get_bits(&s->gb, 8);
1492
        if(v==0){
1493
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1494
            return -1;
1495
        }
1496
        if(intra && i==0 && v!=8){
1497
            av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1498
            v= 8; // needed by pink.mpg / issue1046
1499
        }
1500
        matrix0[j] = v;
1501
        if(matrix1)
1502
            matrix1[j] = v;
1503
    }
1504
    return 0;
1505
}
1506

    
1507
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1508
{
1509
    dprintf(s->avctx, "matrix extension\n");
1510

    
1511
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1512
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1513
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1514
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1515
}
1516

    
1517
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1518
{
1519
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1520

    
1521
    s->full_pel[0] = s->full_pel[1] = 0;
1522
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1523
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1524
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1525
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1526
    if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1527
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1528
        if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1529
            if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1530
                s->pict_type= FF_I_TYPE;
1531
            else
1532
                s->pict_type= FF_P_TYPE;
1533
        }else
1534
            s->pict_type= FF_B_TYPE;
1535
        s->current_picture.pict_type= s->pict_type;
1536
        s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1537
    }
1538
    s->intra_dc_precision = get_bits(&s->gb, 2);
1539
    s->picture_structure = get_bits(&s->gb, 2);
1540
    s->top_field_first = get_bits1(&s->gb);
1541
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1542
    s->concealment_motion_vectors = get_bits1(&s->gb);
1543
    s->q_scale_type = get_bits1(&s->gb);
1544
    s->intra_vlc_format = get_bits1(&s->gb);
1545
    s->alternate_scan = get_bits1(&s->gb);
1546
    s->repeat_first_field = get_bits1(&s->gb);
1547
    s->chroma_420_type = get_bits1(&s->gb);
1548
    s->progressive_frame = get_bits1(&s->gb);
1549

    
1550
    if(s->progressive_sequence && !s->progressive_frame){
1551
        s->progressive_frame= 1;
1552
        av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1553
    }
1554

    
1555
    if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1556
        av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1557
        s->picture_structure= PICT_FRAME;
1558
    }
1559

    
1560
    if(s->progressive_sequence && !s->frame_pred_frame_dct){
1561
        av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1562
        s->frame_pred_frame_dct= 1;
1563
    }
1564

    
1565
    if(s->picture_structure == PICT_FRAME){
1566
        s->first_field=0;
1567
        s->v_edge_pos= 16*s->mb_height;
1568
    }else{
1569
        s->first_field ^= 1;
1570
        s->v_edge_pos=  8*s->mb_height;
1571
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1572
    }
1573

    
1574
    if(s->alternate_scan){
1575
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1576
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1577
    }else{
1578
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1579
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1580
    }
1581

    
1582
    /* composite display not parsed */
1583
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1584
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1585
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1586
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1587
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1588
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1589
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1590
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1591
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1592
}
1593

    
1594
static void exchange_uv(MpegEncContext *s){
1595
    DCTELEM (*tmp)[64];
1596

    
1597
    tmp           = s->pblocks[4];
1598
    s->pblocks[4] = s->pblocks[5];
1599
    s->pblocks[5] = tmp;
1600
}
1601

    
1602
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1603
    AVCodecContext *avctx= s->avctx;
1604
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1605

    
1606
    /* start frame decoding */
1607
    if(s->first_field || s->picture_structure==PICT_FRAME){
1608
        if(MPV_frame_start(s, avctx) < 0)
1609
            return -1;
1610

    
1611
        ff_er_frame_start(s);
1612

    
1613
        /* first check if we must repeat the frame */
1614
        s->current_picture_ptr->repeat_pict = 0;
1615
        if (s->repeat_first_field) {
1616
            if (s->progressive_sequence) {
1617
                if (s->top_field_first)
1618
                    s->current_picture_ptr->repeat_pict = 4;
1619
                else
1620
                    s->current_picture_ptr->repeat_pict = 2;
1621
            } else if (s->progressive_frame) {
1622
                s->current_picture_ptr->repeat_pict = 1;
1623
            }
1624
        }
1625

    
1626
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1627
    }else{ //second field
1628
            int i;
1629

    
1630
            if(!s->current_picture_ptr){
1631
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1632
                return -1;
1633
            }
1634

    
1635
            for(i=0; i<4; i++){
1636
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1637
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1638
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1639
                }
1640
            }
1641
    }
1642

    
1643
    if (avctx->hwaccel) {
1644
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1645
            return -1;
1646
    }
1647

    
1648
// MPV_frame_start will call this function too,
1649
// but we need to call it on every field
1650
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1651
        if(ff_xvmc_field_start(s,avctx) < 0)
1652
            return -1;
1653

    
1654
    return 0;
1655
}
1656

    
1657
#define DECODE_SLICE_ERROR -1
1658
#define DECODE_SLICE_OK 0
1659

    
1660
/**
1661
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1662
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1663
 *         DECODE_SLICE_OK if this slice is ok<br>
1664
 */
1665
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1666
                             const uint8_t **buf, int buf_size)
1667
{
1668
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1669
    AVCodecContext *avctx= s->avctx;
1670
    const int field_pic= s->picture_structure != PICT_FRAME;
1671
    const int lowres= s->avctx->lowres;
1672

    
1673
    s->resync_mb_x=
1674
    s->resync_mb_y= -1;
1675

    
1676
    assert(mb_y < s->mb_height);
1677

    
1678
    init_get_bits(&s->gb, *buf, buf_size*8);
1679

    
1680
    ff_mpeg1_clean_buffers(s);
1681
    s->interlaced_dct = 0;
1682

    
1683
    s->qscale = get_qscale(s);
1684

    
1685
    if(s->qscale == 0){
1686
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1687
        return -1;
1688
    }
1689

    
1690
    /* extra slice info */
1691
    while (get_bits1(&s->gb) != 0) {
1692
        skip_bits(&s->gb, 8);
1693
    }
1694

    
1695
    s->mb_x=0;
1696

    
1697
    if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1698
        skip_bits1(&s->gb);
1699
    }else{
1700
        for(;;) {
1701
            int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1702
            if (code < 0){
1703
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1704
                return -1;
1705
            }
1706
            if (code >= 33) {
1707
                if (code == 33) {
1708
                    s->mb_x += 33;
1709
                }
1710
                /* otherwise, stuffing, nothing to do */
1711
            } else {
1712
                s->mb_x += code;
1713
                break;
1714
            }
1715
        }
1716
    }
1717

    
1718
    if(s->mb_x >= (unsigned)s->mb_width){
1719
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1720
        return -1;
1721
    }
1722

    
1723
    if (avctx->hwaccel) {
1724
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1725
        int start_code = -1;
1726
        buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1727
        if (buf_end < *buf + buf_size)
1728
            buf_end -= 4;
1729
        s->mb_y = mb_y;
1730
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1731
            return DECODE_SLICE_ERROR;
1732
        *buf = buf_end;
1733
        return DECODE_SLICE_OK;
1734
    }
1735

    
1736
    s->resync_mb_x= s->mb_x;
1737
    s->resync_mb_y= s->mb_y= mb_y;
1738
    s->mb_skip_run= 0;
1739
    ff_init_block_index(s);
1740

    
1741
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1742
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1743
             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",
1744
                 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],
1745
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1746
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1747
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1748
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1749
        }
1750
    }
1751

    
1752
    for(;;) {
1753
        //If 1, we memcpy blocks in xvmcvideo.
1754
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1755
            ff_xvmc_init_block(s);//set s->block
1756

    
1757
        if(mpeg_decode_mb(s, s->block) < 0)
1758
            return -1;
1759

    
1760
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1761
            const int wrap = s->b8_stride;
1762
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1763
            int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1764
            int motion_x, motion_y, dir, i;
1765

    
1766
            for(i=0; i<2; i++){
1767
                for(dir=0; dir<2; dir++){
1768
                    if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1769
                        motion_x = motion_y = 0;
1770
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1771
                        motion_x = s->mv[dir][0][0];
1772
                        motion_y = s->mv[dir][0][1];
1773
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1774
                        motion_x = s->mv[dir][i][0];
1775
                        motion_y = s->mv[dir][i][1];
1776
                    }
1777

    
1778
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1779
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1780
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1781
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1782
                    s->current_picture.ref_index [dir][b8_xy    ]=
1783
                    s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1784
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1785
                }
1786
                xy += wrap;
1787
                b8_xy +=2;
1788
            }
1789
        }
1790

    
1791
        s->dest[0] += 16 >> lowres;
1792
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1793
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1794

    
1795
        MPV_decode_mb(s, s->block);
1796

    
1797
        if (++s->mb_x >= s->mb_width) {
1798
            const int mb_size= 16>>s->avctx->lowres;
1799

    
1800
            ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1801

    
1802
            s->mb_x = 0;
1803
            s->mb_y += 1<<field_pic;
1804

    
1805
            if(s->mb_y >= s->mb_height){
1806
                int left= get_bits_left(&s->gb);
1807
                int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1808
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1809
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1810

    
1811
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1812
                   || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1813
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1814
                    return -1;
1815
                }else
1816
                    goto eos;
1817
            }
1818

    
1819
            ff_init_block_index(s);
1820
        }
1821

    
1822
        /* skip mb handling */
1823
        if (s->mb_skip_run == -1) {
1824
            /* read increment again */
1825
            s->mb_skip_run = 0;
1826
            for(;;) {
1827
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1828
                if (code < 0){
1829
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1830
                    return -1;
1831
                }
1832
                if (code >= 33) {
1833
                    if (code == 33) {
1834
                        s->mb_skip_run += 33;
1835
                    }else if(code == 35){
1836
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1837
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1838
                            return -1;
1839
                        }
1840
                        goto eos; /* end of slice */
1841
                    }
1842
                    /* otherwise, stuffing, nothing to do */
1843
                } else {
1844
                    s->mb_skip_run += code;
1845
                    break;
1846
                }
1847
            }
1848
            if(s->mb_skip_run){
1849
                int i;
1850
                if(s->pict_type == FF_I_TYPE){
1851
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1852
                    return -1;
1853
                }
1854

    
1855
                /* skip mb */
1856
                s->mb_intra = 0;
1857
                for(i=0;i<12;i++)
1858
                    s->block_last_index[i] = -1;
1859
                if(s->picture_structure == PICT_FRAME)
1860
                    s->mv_type = MV_TYPE_16X16;
1861
                else
1862
                    s->mv_type = MV_TYPE_FIELD;
1863
                if (s->pict_type == FF_P_TYPE) {
1864
                    /* if P type, zero motion vector is implied */
1865
                    s->mv_dir = MV_DIR_FORWARD;
1866
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1867
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1868
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1869
                    s->field_select[0][0]= (s->picture_structure - 1) & 1;
1870
                } else {
1871
                    /* if B type, reuse previous vectors and directions */
1872
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1873
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1874
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1875
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1876
                }
1877
            }
1878
        }
1879
    }
1880
eos: // end of slice
1881
    *buf += (get_bits_count(&s->gb)-1)/8;
1882
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1883
    return 0;
1884
}
1885

    
1886
static int slice_decode_thread(AVCodecContext *c, void *arg){
1887
    MpegEncContext *s= *(void**)arg;
1888
    const uint8_t *buf= s->gb.buffer;
1889
    int mb_y= s->start_mb_y;
1890
    const int field_pic= s->picture_structure != PICT_FRAME;
1891

    
1892
    s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1893

    
1894
    for(;;){
1895
        uint32_t start_code;
1896
        int ret;
1897

    
1898
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1899
        emms_c();
1900
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1901
//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);
1902
        if(ret < 0){
1903
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1904
                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);
1905
        }else{
1906
            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);
1907
        }
1908

    
1909
        if(s->mb_y == s->end_mb_y)
1910
            return 0;
1911

    
1912
        start_code= -1;
1913
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1914
        mb_y= start_code - SLICE_MIN_START_CODE;
1915
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1916
            return -1;
1917
    }
1918

    
1919
    return 0; //not reached
1920
}
1921

    
1922
/**
1923
 * Handles slice ends.
1924
 * @return 1 if it seems to be the last slice
1925
 */
1926
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1927
{
1928
    Mpeg1Context *s1 = avctx->priv_data;
1929
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1930

    
1931
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1932
        return 0;
1933

    
1934
    if (s->avctx->hwaccel) {
1935
        if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1936
            av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1937
    }
1938

    
1939
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1940
        ff_xvmc_field_end(s);
1941

    
1942
    /* end of slice reached */
1943
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1944
        /* end of image */
1945

    
1946
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1947

    
1948
        ff_er_frame_end(s);
1949

    
1950
        MPV_frame_end(s);
1951

    
1952
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1953
            *pict= *(AVFrame*)s->current_picture_ptr;
1954
            ff_print_debug_info(s, pict);
1955
        } else {
1956
            s->picture_number++;
1957
            /* latency of 1 frame for I- and P-frames */
1958
            /* XXX: use another variable than picture_number */
1959
            if (s->last_picture_ptr != NULL) {
1960
                *pict= *(AVFrame*)s->last_picture_ptr;
1961
                 ff_print_debug_info(s, pict);
1962
            }
1963
        }
1964

    
1965
        return 1;
1966
    } else {
1967
        return 0;
1968
    }
1969
}
1970

    
1971
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1972
                                 const uint8_t *buf, int buf_size)
1973
{
1974
    Mpeg1Context *s1 = avctx->priv_data;
1975
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1976
    int width,height;
1977
    int i, v, j;
1978

    
1979
    init_get_bits(&s->gb, buf, buf_size*8);
1980

    
1981
    width = get_bits(&s->gb, 12);
1982
    height = get_bits(&s->gb, 12);
1983
    if (width <= 0 || height <= 0)
1984
        return -1;
1985
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1986
    if (s->aspect_ratio_info == 0) {
1987
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1988
        if (avctx->error_recognition >= FF_ER_COMPLIANT)
1989
            return -1;
1990
    }
1991
    s->frame_rate_index = get_bits(&s->gb, 4);
1992
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1993
        return -1;
1994
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1995
    if (get_bits1(&s->gb) == 0) /* marker */
1996
        return -1;
1997
    s->width = width;
1998
    s->height = height;
1999

    
2000
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2001
    skip_bits(&s->gb, 1);
2002

    
2003
    /* get matrix */
2004
    if (get_bits1(&s->gb)) {
2005
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2006
    } else {
2007
        for(i=0;i<64;i++) {
2008
            j = s->dsp.idct_permutation[i];
2009
            v = ff_mpeg1_default_intra_matrix[i];
2010
            s->intra_matrix[j] = v;
2011
            s->chroma_intra_matrix[j] = v;
2012
        }
2013
    }
2014
    if (get_bits1(&s->gb)) {
2015
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2016
    } else {
2017
        for(i=0;i<64;i++) {
2018
            int j= s->dsp.idct_permutation[i];
2019
            v = ff_mpeg1_default_non_intra_matrix[i];
2020
            s->inter_matrix[j] = v;
2021
            s->chroma_inter_matrix[j] = v;
2022
        }
2023
    }
2024

    
2025
    if(show_bits(&s->gb, 23) != 0){
2026
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2027
        return -1;
2028
    }
2029

    
2030
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2031
    s->progressive_sequence = 1;
2032
    s->progressive_frame = 1;
2033
    s->picture_structure = PICT_FRAME;
2034
    s->frame_pred_frame_dct = 1;
2035
    s->chroma_format = 1;
2036
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2037
    avctx->sub_id = 1; /* indicates MPEG-1 */
2038
    s->out_format = FMT_MPEG1;
2039
    s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2040
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2041

    
2042
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2043
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2044
               s->avctx->rc_buffer_size, s->bit_rate);
2045

    
2046
    return 0;
2047
}
2048

    
2049
static int vcr2_init_sequence(AVCodecContext *avctx)
2050
{
2051
    Mpeg1Context *s1 = avctx->priv_data;
2052
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2053
    int i, v;
2054

    
2055
    /* start new MPEG-1 context decoding */
2056
    s->out_format = FMT_MPEG1;
2057
    if (s1->mpeg_enc_ctx_allocated) {
2058
        MPV_common_end(s);
2059
    }
2060
    s->width  = avctx->coded_width;
2061
    s->height = avctx->coded_height;
2062
    avctx->has_b_frames= 0; //true?
2063
    s->low_delay= 1;
2064

    
2065
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2066
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2067

    
2068
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2069
        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2070
        if( avctx->idct_algo == FF_IDCT_AUTO )
2071
            avctx->idct_algo = FF_IDCT_SIMPLE;
2072

    
2073
    if (MPV_common_init(s) < 0)
2074
        return -1;
2075
    exchange_uv(s);//common init reset pblocks, so we swap them here
2076
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2077
    s1->mpeg_enc_ctx_allocated = 1;
2078

    
2079
    for(i=0;i<64;i++) {
2080
        int j= s->dsp.idct_permutation[i];
2081
        v = ff_mpeg1_default_intra_matrix[i];
2082
        s->intra_matrix[j] = v;
2083
        s->chroma_intra_matrix[j] = v;
2084

    
2085
        v = ff_mpeg1_default_non_intra_matrix[i];
2086
        s->inter_matrix[j] = v;
2087
        s->chroma_inter_matrix[j] = v;
2088
    }
2089

    
2090
    s->progressive_sequence = 1;
2091
    s->progressive_frame = 1;
2092
    s->picture_structure = PICT_FRAME;
2093
    s->frame_pred_frame_dct = 1;
2094
    s->chroma_format = 1;
2095
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2096
    avctx->sub_id = 2; /* indicates MPEG-2 */
2097
    s1->save_width           = s->width;
2098
    s1->save_height          = s->height;
2099
    s1->save_progressive_seq = s->progressive_sequence;
2100
    return 0;
2101
}
2102

    
2103

    
2104
static void mpeg_decode_user_data(AVCodecContext *avctx,
2105
                                  const uint8_t *p, int buf_size)
2106
{
2107
    const uint8_t *buf_end = p+buf_size;
2108

    
2109
    /* we parse the DTG active format information */
2110
    if (buf_end - p >= 5 &&
2111
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2112
        int flags = p[4];
2113
        p += 5;
2114
        if (flags & 0x80) {
2115
            /* skip event id */
2116
            p += 2;
2117
        }
2118
        if (flags & 0x40) {
2119
            if (buf_end - p < 1)
2120
                return;
2121
            avctx->dtg_active_format = p[0] & 0x0f;
2122
        }
2123
    }
2124
}
2125

    
2126
static void mpeg_decode_gop(AVCodecContext *avctx,
2127
                            const uint8_t *buf, int buf_size){
2128
    Mpeg1Context *s1 = avctx->priv_data;
2129
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2130

    
2131
    int drop_frame_flag;
2132
    int time_code_hours, time_code_minutes;
2133
    int time_code_seconds, time_code_pictures;
2134
    int broken_link;
2135

    
2136
    init_get_bits(&s->gb, buf, buf_size*8);
2137

    
2138
    drop_frame_flag = get_bits1(&s->gb);
2139

    
2140
    time_code_hours=get_bits(&s->gb,5);
2141
    time_code_minutes = get_bits(&s->gb,6);
2142
    skip_bits1(&s->gb);//marker bit
2143
    time_code_seconds = get_bits(&s->gb,6);
2144
    time_code_pictures = get_bits(&s->gb,6);
2145

    
2146
    s->closed_gop = get_bits1(&s->gb);
2147
    /*broken_link indicate that after editing the
2148
      reference frames of the first B-Frames after GOP I-Frame
2149
      are missing (open gop)*/
2150
    broken_link = get_bits1(&s->gb);
2151

    
2152
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2153
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2154
            time_code_hours, time_code_minutes, time_code_seconds,
2155
            time_code_pictures, s->closed_gop, broken_link);
2156
}
2157
/**
2158
 * Finds the end of the current frame in the bitstream.
2159
 * @return the position of the first byte of the next frame, or -1
2160
 */
2161
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2162
{
2163
    int i;
2164
    uint32_t state= pc->state;
2165

    
2166
    /* EOF considered as end of frame */
2167
    if (buf_size == 0)
2168
        return 0;
2169

    
2170
/*
2171
 0  frame start         -> 1/4
2172
 1  first_SEQEXT        -> 0/2
2173
 2  first field start   -> 3/0
2174
 3  second_SEQEXT       -> 2/0
2175
 4  searching end
2176
*/
2177

    
2178
    for(i=0; i<buf_size; i++){
2179
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2180
        if(pc->frame_start_found&1){
2181
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2182
                pc->frame_start_found--;
2183
            else if(state == EXT_START_CODE+2){
2184
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2185
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2186
            }
2187
            state++;
2188
        }else{
2189
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2190
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2191
                i++;
2192
                pc->frame_start_found=4;
2193
            }
2194
            if(state == SEQ_END_CODE){
2195
                pc->state=-1;
2196
                return i+1;
2197
            }
2198
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2199
                pc->frame_start_found= 0;
2200
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2201
                pc->frame_start_found++;
2202
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2203
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2204
                    pc->frame_start_found=0;
2205
                    pc->state=-1;
2206
                    return i-3;
2207
                }
2208
            }
2209
            if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2210
                ff_fetch_timestamp(s, i-3, 1);
2211
            }
2212
        }
2213
    }
2214
    pc->state= state;
2215
    return END_NOT_FOUND;
2216
}
2217

    
2218
static int decode_chunks(AVCodecContext *avctx,
2219
                             AVFrame *picture, int *data_size,
2220
                             const uint8_t *buf, int buf_size);
2221

    
2222
/* handle buffering and image synchronisation */
2223
static int mpeg_decode_frame(AVCodecContext *avctx,
2224
                             void *data, int *data_size,
2225
                             AVPacket *avpkt)
2226
{
2227
    const uint8_t *buf = avpkt->data;
2228
    int buf_size = avpkt->size;
2229
    Mpeg1Context *s = avctx->priv_data;
2230
    AVFrame *picture = data;
2231
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2232
    dprintf(avctx, "fill_buffer\n");
2233

    
2234
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2235
        /* special case for last picture */
2236
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2237
            *picture= *(AVFrame*)s2->next_picture_ptr;
2238
            s2->next_picture_ptr= NULL;
2239

    
2240
            *data_size = sizeof(AVFrame);
2241
        }
2242
        return buf_size;
2243
    }
2244

    
2245
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2246
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2247

    
2248
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2249
            return buf_size;
2250
    }
2251

    
2252
#if 0
2253
    if (s->repeat_field % 2 == 1) {
2254
        s->repeat_field++;
2255
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2256
        //        s2->picture_number, s->repeat_field);
2257
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2258
            *data_size = sizeof(AVPicture);
2259
            goto the_end;
2260
        }
2261
    }
2262
#endif
2263

    
2264
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2265
        vcr2_init_sequence(avctx);
2266

    
2267
    s->slice_count= 0;
2268

    
2269
    if(avctx->extradata && !avctx->frame_number)
2270
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2271

    
2272
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2273
}
2274

    
2275
static int decode_chunks(AVCodecContext *avctx,
2276
                             AVFrame *picture, int *data_size,
2277
                             const uint8_t *buf, int buf_size)
2278
{
2279
    Mpeg1Context *s = avctx->priv_data;
2280
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2281
    const uint8_t *buf_ptr = buf;
2282
    const uint8_t *buf_end = buf + buf_size;
2283
    int ret, input_size;
2284
    int last_code= 0;
2285

    
2286
    for(;;) {
2287
        /* find next start code */
2288
        uint32_t start_code = -1;
2289
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2290
        if (start_code > 0x1ff){
2291
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2292
                if(avctx->thread_count > 1){
2293
                    int i;
2294

    
2295
                    avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2296
                    for(i=0; i<s->slice_count; i++)
2297
                        s2->error_count += s2->thread_context[i]->error_count;
2298
                }
2299

    
2300
                if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2301
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2302

    
2303
                if (slice_end(avctx, picture)) {
2304
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2305
                        *data_size = sizeof(AVPicture);
2306
                }
2307
            }
2308
            s2->pict_type= 0;
2309
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2310
        }
2311

    
2312
        input_size = buf_end - buf_ptr;
2313

    
2314
        if(avctx->debug & FF_DEBUG_STARTCODE){
2315
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2316
        }
2317

    
2318
        /* prepare data for next start code */
2319
        switch(start_code) {
2320
        case SEQ_START_CODE:
2321
            if(last_code == 0){
2322
            mpeg1_decode_sequence(avctx, buf_ptr,
2323
                                    input_size);
2324
                s->sync=1;
2325
            }else{
2326
                av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2327
            }
2328
            break;
2329

    
2330
        case PICTURE_START_CODE:
2331
            if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2332
            if(mpeg_decode_postinit(avctx) < 0){
2333
                av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2334
                return -1;
2335
            }
2336

    
2337
            /* we have a complete image: we try to decompress it */
2338
            if(mpeg1_decode_picture(avctx,
2339
                                    buf_ptr, input_size) < 0)
2340
                s2->pict_type=0;
2341
                s2->first_slice = 1;
2342
            last_code= PICTURE_START_CODE;
2343
            }else{
2344
                av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2345
            }
2346
            break;
2347
        case EXT_START_CODE:
2348
            init_get_bits(&s2->gb, buf_ptr, input_size*8);
2349

    
2350
            switch(get_bits(&s2->gb, 4)) {
2351
            case 0x1:
2352
                if(last_code == 0){
2353
                mpeg_decode_sequence_extension(s);
2354
                }else{
2355
                    av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2356
                }
2357
                break;
2358
            case 0x2:
2359
                mpeg_decode_sequence_display_extension(s);
2360
                break;
2361
            case 0x3:
2362
                mpeg_decode_quant_matrix_extension(s2);
2363
                break;
2364
            case 0x7:
2365
                mpeg_decode_picture_display_extension(s);
2366
                break;
2367
            case 0x8:
2368
                if(last_code == PICTURE_START_CODE){
2369
                mpeg_decode_picture_coding_extension(s);
2370
                }else{
2371
                    av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2372
                }
2373
                break;
2374
            }
2375
            break;
2376
        case USER_START_CODE:
2377
            mpeg_decode_user_data(avctx,
2378
                                    buf_ptr, input_size);
2379
            break;
2380
        case GOP_START_CODE:
2381
            if(last_code == 0){
2382
            s2->first_field=0;
2383
            mpeg_decode_gop(avctx,
2384
                                    buf_ptr, input_size);
2385
                s->sync=1;
2386
            }else{
2387
                av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2388
            }
2389
            break;
2390
        default:
2391
            if (start_code >= SLICE_MIN_START_CODE &&
2392
                start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2393
                const int field_pic= s2->picture_structure != PICT_FRAME;
2394
                int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2395
                last_code= SLICE_MIN_START_CODE;
2396

    
2397
                if(s2->picture_structure == PICT_BOTTOM_FIELD)
2398
                    mb_y++;
2399

    
2400
                if (mb_y >= s2->mb_height){
2401
                    av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2402
                    return -1;
2403
                }
2404

    
2405
                if(s2->last_picture_ptr==NULL){
2406
                /* Skip B-frames if we do not have reference frames and gop is not closed */
2407
                    if(s2->pict_type==FF_B_TYPE){
2408
                        if(!s2->closed_gop)
2409
                            break;
2410
                    }
2411
                }
2412
                if(s2->pict_type==FF_I_TYPE)
2413
                    s->sync=1;
2414
                if(s2->next_picture_ptr==NULL){
2415
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2416
                    if(s2->pict_type==FF_P_TYPE && !s->sync) break;
2417
                }
2418
                /* Skip B-frames if we are in a hurry. */
2419
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2420
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2421
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2422
                    || avctx->skip_frame >= AVDISCARD_ALL)
2423
                    break;
2424
                /* Skip everything if we are in a hurry>=5. */
2425
                if(avctx->hurry_up>=5) break;
2426

    
2427
                if (!s->mpeg_enc_ctx_allocated) break;
2428

    
2429
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2430
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2431
                        break;
2432
                }
2433

    
2434
                if(!s2->pict_type){
2435
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2436
                    break;
2437
                }
2438

    
2439
                if(s2->first_slice){
2440
                    s2->first_slice=0;
2441
                    if(mpeg_field_start(s2, buf, buf_size) < 0)
2442
                        return -1;
2443
                }
2444
                if(!s2->current_picture_ptr){
2445
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2446
                    return -1;
2447
                }
2448

    
2449
                if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2450
                    s->slice_count++;
2451
                    break;
2452
                }
2453

    
2454
                if(avctx->thread_count > 1){
2455
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2456
                    if(threshold <= mb_y){
2457
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2458

    
2459
                        thread_context->start_mb_y= mb_y;
2460
                        thread_context->end_mb_y  = s2->mb_height;
2461
                        if(s->slice_count){
2462
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2463
                            ff_update_duplicate_context(thread_context, s2);
2464
                        }
2465
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2466
                        s->slice_count++;
2467
                    }
2468
                    buf_ptr += 2; //FIXME add minimum number of bytes per slice
2469
                }else{
2470
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2471
                    emms_c();
2472

    
2473
                    if(ret < 0){
2474
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2475
                            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);
2476
                    }else{
2477
                        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);
2478
                    }
2479
                }
2480
            }
2481
            break;
2482
        }
2483
    }
2484
}
2485

    
2486
static void flush(AVCodecContext *avctx){
2487
    Mpeg1Context *s = avctx->priv_data;
2488

    
2489
    s->sync=0;
2490

    
2491
    ff_mpeg_flush(avctx);
2492
}
2493

    
2494
static int mpeg_decode_end(AVCodecContext *avctx)
2495
{
2496
    Mpeg1Context *s = avctx->priv_data;
2497

    
2498
    if (s->mpeg_enc_ctx_allocated)
2499
        MPV_common_end(&s->mpeg_enc_ctx);
2500
    return 0;
2501
}
2502

    
2503
AVCodec mpeg1video_decoder = {
2504
    "mpeg1video",
2505
    AVMEDIA_TYPE_VIDEO,
2506
    CODEC_ID_MPEG1VIDEO,
2507
    sizeof(Mpeg1Context),
2508
    mpeg_decode_init,
2509
    NULL,
2510
    mpeg_decode_end,
2511
    mpeg_decode_frame,
2512
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2513
    .flush= flush,
2514
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2515
};
2516

    
2517
AVCodec mpeg2video_decoder = {
2518
    "mpeg2video",
2519
    AVMEDIA_TYPE_VIDEO,
2520
    CODEC_ID_MPEG2VIDEO,
2521
    sizeof(Mpeg1Context),
2522
    mpeg_decode_init,
2523
    NULL,
2524
    mpeg_decode_end,
2525
    mpeg_decode_frame,
2526
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2527
    .flush= flush,
2528
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2529
};
2530

    
2531
//legacy decoder
2532
AVCodec mpegvideo_decoder = {
2533
    "mpegvideo",
2534
    AVMEDIA_TYPE_VIDEO,
2535
    CODEC_ID_MPEG2VIDEO,
2536
    sizeof(Mpeg1Context),
2537
    mpeg_decode_init,
2538
    NULL,
2539
    mpeg_decode_end,
2540
    mpeg_decode_frame,
2541
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2542
    .flush= flush,
2543
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2544
};
2545

    
2546
#if CONFIG_MPEG_XVMC_DECODER
2547
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2548
    if( avctx->thread_count > 1)
2549
        return -1;
2550
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2551
        return -1;
2552
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2553
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2554
    }
2555
    mpeg_decode_init(avctx);
2556

    
2557
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2558
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2559

    
2560
    return 0;
2561
}
2562

    
2563
AVCodec mpeg_xvmc_decoder = {
2564
    "mpegvideo_xvmc",
2565
    AVMEDIA_TYPE_VIDEO,
2566
    CODEC_ID_MPEG2VIDEO_XVMC,
2567
    sizeof(Mpeg1Context),
2568
    mpeg_mc_decode_init,
2569
    NULL,
2570
    mpeg_decode_end,
2571
    mpeg_decode_frame,
2572
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2573
    .flush= flush,
2574
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2575
};
2576

    
2577
#endif
2578

    
2579
#if CONFIG_MPEG_VDPAU_DECODER
2580
AVCodec mpeg_vdpau_decoder = {
2581
    "mpegvideo_vdpau",
2582
    AVMEDIA_TYPE_VIDEO,
2583
    CODEC_ID_MPEG2VIDEO,
2584
    sizeof(Mpeg1Context),
2585
    mpeg_decode_init,
2586
    NULL,
2587
    mpeg_decode_end,
2588
    mpeg_decode_frame,
2589
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2590
    .flush= flush,
2591
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2592
};
2593
#endif
2594

    
2595
#if CONFIG_MPEG1_VDPAU_DECODER
2596
AVCodec mpeg1_vdpau_decoder = {
2597
    "mpeg1video_vdpau",
2598
    AVMEDIA_TYPE_VIDEO,
2599
    CODEC_ID_MPEG1VIDEO,
2600
    sizeof(Mpeg1Context),
2601
    mpeg_decode_init,
2602
    NULL,
2603
    mpeg_decode_end,
2604
    mpeg_decode_frame,
2605
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2606
    .flush= flush,
2607
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2608
};
2609
#endif
2610