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ffmpeg / libavcodec / mpeg12.c @ dfd2a005

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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
25
 * MPEG-1/2 decoder
26
 */
27

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

    
34
#include "mpeg12.h"
35
#include "mpeg12data.h"
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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
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#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
49
#define MB_BTYPE_VLC_BITS 6
50

    
51
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
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                              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);
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static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
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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[] = {
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                                           PIX_FMT_XVMC_MPEG2_IDCT,
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                                           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
VLC ff_dc_lum_vlc;
141
VLC ff_dc_chroma_vlc;
142

    
143
static VLC mv_vlc;
144
static VLC mbincr_vlc;
145
static VLC mb_ptype_vlc;
146
static VLC mb_btype_vlc;
147
static VLC mb_pat_vlc;
148

    
149
av_cold void ff_mpeg12_init_vlcs(void)
150
{
151
    static int done = 0;
152

    
153
    if (!done) {
154
        done = 1;
155

    
156
        INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
157
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
158
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
159
        INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
160
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
161
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
162
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
163
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
164
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
165
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
166
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
167
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
168
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
169
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
170
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
171

    
172
        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
173
                 &table_mb_ptype[0][1], 2, 1,
174
                 &table_mb_ptype[0][0], 2, 1, 64);
175
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
176
                 &table_mb_btype[0][1], 2, 1,
177
                 &table_mb_btype[0][0], 2, 1, 64);
178
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
179
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
180

    
181
        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
182
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
183
    }
184
}
185

    
186
static inline int get_dmv(MpegEncContext *s)
187
{
188
    if(get_bits1(&s->gb))
189
        return 1 - (get_bits1(&s->gb) << 1);
190
    else
191
        return 0;
192
}
193

    
194
static inline int get_qscale(MpegEncContext *s)
195
{
196
    int qscale = get_bits(&s->gb, 5);
197
    if (s->q_scale_type) {
198
        return non_linear_qscale[qscale];
199
    } else {
200
        return qscale << 1;
201
    }
202
}
203

    
204
/* motion type (for MPEG-2) */
205
#define MT_FIELD 1
206
#define MT_FRAME 2
207
#define MT_16X8  2
208
#define MT_DMV   3
209

    
210
static int mpeg_decode_mb(MpegEncContext *s,
211
                          DCTELEM block[12][64])
212
{
213
    int i, j, k, cbp, val, mb_type, motion_type;
214
    const int mb_block_count = 4 + (1<< s->chroma_format);
215

    
216
    av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
217

    
218
    assert(s->mb_skipped==0);
219

    
220
    if (s->mb_skip_run-- != 0) {
221
        if (s->pict_type == FF_P_TYPE) {
222
            s->mb_skipped = 1;
223
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
224
        } else {
225
            int mb_type;
226

    
227
            if(s->mb_x)
228
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
229
            else
230
                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
231
            if(IS_INTRA(mb_type))
232
                return -1;
233

    
234
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
235
                mb_type | MB_TYPE_SKIP;
236
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
237

    
238
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
239
                s->mb_skipped = 1;
240
        }
241

    
242
        return 0;
243
    }
244

    
245
    switch(s->pict_type) {
246
    default:
247
    case FF_I_TYPE:
248
        if (get_bits1(&s->gb) == 0) {
249
            if (get_bits1(&s->gb) == 0){
250
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
251
                return -1;
252
            }
253
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
254
        } else {
255
            mb_type = MB_TYPE_INTRA;
256
        }
257
        break;
258
    case FF_P_TYPE:
259
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
260
        if (mb_type < 0){
261
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
262
            return -1;
263
        }
264
        mb_type = ptype2mb_type[ mb_type ];
265
        break;
266
    case FF_B_TYPE:
267
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
268
        if (mb_type < 0){
269
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
270
            return -1;
271
        }
272
        mb_type = btype2mb_type[ mb_type ];
273
        break;
274
    }
275
    av_dlog(s->avctx, "mb_type=%x\n", mb_type);
276
//    motion_type = 0; /* avoid warning */
277
    if (IS_INTRA(mb_type)) {
278
        s->dsp.clear_blocks(s->block[0]);
279

    
280
        if(!s->chroma_y_shift){
281
            s->dsp.clear_blocks(s->block[6]);
282
        }
283

    
284
        /* compute DCT type */
285
        if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
286
            !s->frame_pred_frame_dct) {
287
            s->interlaced_dct = get_bits1(&s->gb);
288
        }
289

    
290
        if (IS_QUANT(mb_type))
291
            s->qscale = get_qscale(s);
292

    
293
        if (s->concealment_motion_vectors) {
294
            /* just parse them */
295
            if (s->picture_structure != PICT_FRAME)
296
                skip_bits1(&s->gb); /* field select */
297

    
298
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
299
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
300
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
301
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
302

    
303
            skip_bits1(&s->gb); /* marker */
304
        }else
305
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
306
        s->mb_intra = 1;
307
        //if 1, we memcpy blocks in xvmcvideo
308
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
309
            ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
310
            if(s->swap_uv){
311
                exchange_uv(s);
312
            }
313
        }
314

    
315
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
316
            if(s->flags2 & CODEC_FLAG2_FAST){
317
                for(i=0;i<6;i++) {
318
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
319
                }
320
            }else{
321
                for(i=0;i<mb_block_count;i++) {
322
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
323
                        return -1;
324
                }
325
            }
326
        } else {
327
            for(i=0;i<6;i++) {
328
                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
329
                    return -1;
330
            }
331
        }
332
    } else {
333
        if (mb_type & MB_TYPE_ZERO_MV){
334
            assert(mb_type & MB_TYPE_CBP);
335

    
336
            s->mv_dir = MV_DIR_FORWARD;
337
            if(s->picture_structure == PICT_FRAME){
338
                if(!s->frame_pred_frame_dct)
339
                    s->interlaced_dct = get_bits1(&s->gb);
340
                s->mv_type = MV_TYPE_16X16;
341
            }else{
342
                s->mv_type = MV_TYPE_FIELD;
343
                mb_type |= MB_TYPE_INTERLACED;
344
                s->field_select[0][0]= s->picture_structure - 1;
345
            }
346

    
347
            if (IS_QUANT(mb_type))
348
                s->qscale = get_qscale(s);
349

    
350
            s->last_mv[0][0][0] = 0;
351
            s->last_mv[0][0][1] = 0;
352
            s->last_mv[0][1][0] = 0;
353
            s->last_mv[0][1][1] = 0;
354
            s->mv[0][0][0] = 0;
355
            s->mv[0][0][1] = 0;
356
        }else{
357
            assert(mb_type & MB_TYPE_L0L1);
358
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
359
            /* get additional motion vector type */
360
            if (s->frame_pred_frame_dct)
361
                motion_type = MT_FRAME;
362
            else{
363
                motion_type = get_bits(&s->gb, 2);
364
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
365
                    s->interlaced_dct = get_bits1(&s->gb);
366
            }
367

    
368
            if (IS_QUANT(mb_type))
369
                s->qscale = get_qscale(s);
370

    
371
            /* motion vectors */
372
            s->mv_dir= (mb_type>>13)&3;
373
            av_dlog(s->avctx, "motion_type=%d\n", motion_type);
374
            switch(motion_type) {
375
            case MT_FRAME: /* or MT_16X8 */
376
                if (s->picture_structure == PICT_FRAME) {
377
                    mb_type |= MB_TYPE_16x16;
378
                    s->mv_type = MV_TYPE_16X16;
379
                    for(i=0;i<2;i++) {
380
                        if (USES_LIST(mb_type, i)) {
381
                            /* MT_FRAME */
382
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
383
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
384
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
385
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
386
                            /* full_pel: only for MPEG-1 */
387
                            if (s->full_pel[i]){
388
                                s->mv[i][0][0] <<= 1;
389
                                s->mv[i][0][1] <<= 1;
390
                            }
391
                        }
392
                    }
393
                } else {
394
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
395
                    s->mv_type = MV_TYPE_16X8;
396
                    for(i=0;i<2;i++) {
397
                        if (USES_LIST(mb_type, i)) {
398
                            /* MT_16X8 */
399
                            for(j=0;j<2;j++) {
400
                                s->field_select[i][j] = get_bits1(&s->gb);
401
                                for(k=0;k<2;k++) {
402
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
403
                                                             s->last_mv[i][j][k]);
404
                                    s->last_mv[i][j][k] = val;
405
                                    s->mv[i][j][k] = val;
406
                                }
407
                            }
408
                        }
409
                    }
410
                }
411
                break;
412
            case MT_FIELD:
413
                s->mv_type = MV_TYPE_FIELD;
414
                if (s->picture_structure == PICT_FRAME) {
415
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
416
                    for(i=0;i<2;i++) {
417
                        if (USES_LIST(mb_type, i)) {
418
                            for(j=0;j<2;j++) {
419
                                s->field_select[i][j] = get_bits1(&s->gb);
420
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
421
                                                         s->last_mv[i][j][0]);
422
                                s->last_mv[i][j][0] = val;
423
                                s->mv[i][j][0] = val;
424
                                av_dlog(s->avctx, "fmx=%d\n", val);
425
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
426
                                                         s->last_mv[i][j][1] >> 1);
427
                                s->last_mv[i][j][1] = val << 1;
428
                                s->mv[i][j][1] = val;
429
                                av_dlog(s->avctx, "fmy=%d\n", val);
430
                            }
431
                        }
432
                    }
433
                } else {
434
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
435
                    for(i=0;i<2;i++) {
436
                        if (USES_LIST(mb_type, i)) {
437
                            s->field_select[i][0] = get_bits1(&s->gb);
438
                            for(k=0;k<2;k++) {
439
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
440
                                                         s->last_mv[i][0][k]);
441
                                s->last_mv[i][0][k] = val;
442
                                s->last_mv[i][1][k] = val;
443
                                s->mv[i][0][k] = val;
444
                            }
445
                        }
446
                    }
447
                }
448
                break;
449
            case MT_DMV:
450
                s->mv_type = MV_TYPE_DMV;
451
                for(i=0;i<2;i++) {
452
                    if (USES_LIST(mb_type, i)) {
453
                        int dmx, dmy, mx, my, m;
454
                        const int my_shift= s->picture_structure == PICT_FRAME;
455

    
456
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
457
                                                s->last_mv[i][0][0]);
458
                        s->last_mv[i][0][0] = mx;
459
                        s->last_mv[i][1][0] = mx;
460
                        dmx = get_dmv(s);
461
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
462
                                                s->last_mv[i][0][1] >> my_shift);
463
                        dmy = get_dmv(s);
464

    
465

    
466
                        s->last_mv[i][0][1] = my<<my_shift;
467
                        s->last_mv[i][1][1] = my<<my_shift;
468

    
469
                        s->mv[i][0][0] = mx;
470
                        s->mv[i][0][1] = my;
471
                        s->mv[i][1][0] = mx;//not used
472
                        s->mv[i][1][1] = my;//not used
473

    
474
                        if (s->picture_structure == PICT_FRAME) {
475
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
476

    
477
                            //m = 1 + 2 * s->top_field_first;
478
                            m = s->top_field_first ? 1 : 3;
479

    
480
                            /* top -> top pred */
481
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
483
                            m = 4 - m;
484
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
485
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
486
                        } else {
487
                            mb_type |= MB_TYPE_16x16;
488

    
489
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
490
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
491
                            if(s->picture_structure == PICT_TOP_FIELD)
492
                                s->mv[i][2][1]--;
493
                            else
494
                                s->mv[i][2][1]++;
495
                        }
496
                    }
497
                }
498
                break;
499
            default:
500
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
501
                return -1;
502
            }
503
        }
504

    
505
        s->mb_intra = 0;
506
        if (HAS_CBP(mb_type)) {
507
            s->dsp.clear_blocks(s->block[0]);
508

    
509
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
510
            if(mb_block_count > 6){
511
                 cbp<<= mb_block_count-6;
512
                 cbp |= get_bits(&s->gb, mb_block_count-6);
513
                 s->dsp.clear_blocks(s->block[6]);
514
            }
515
            if (cbp <= 0){
516
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
517
                return -1;
518
            }
519

    
520
            //if 1, we memcpy blocks in xvmcvideo
521
            if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
522
                ff_xvmc_pack_pblocks(s,cbp);
523
                if(s->swap_uv){
524
                    exchange_uv(s);
525
                }
526
            }
527

    
528
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
529
                if(s->flags2 & CODEC_FLAG2_FAST){
530
                    for(i=0;i<6;i++) {
531
                        if(cbp & 32) {
532
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
533
                        } else {
534
                            s->block_last_index[i] = -1;
535
                        }
536
                        cbp+=cbp;
537
                    }
538
                }else{
539
                    cbp<<= 12-mb_block_count;
540

    
541
                    for(i=0;i<mb_block_count;i++) {
542
                        if ( cbp & (1<<11) ) {
543
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
544
                                return -1;
545
                        } else {
546
                            s->block_last_index[i] = -1;
547
                        }
548
                        cbp+=cbp;
549
                    }
550
                }
551
            } else {
552
                if(s->flags2 & CODEC_FLAG2_FAST){
553
                    for(i=0;i<6;i++) {
554
                        if (cbp & 32) {
555
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
556
                        } else {
557
                            s->block_last_index[i] = -1;
558
                        }
559
                        cbp+=cbp;
560
                    }
561
                }else{
562
                    for(i=0;i<6;i++) {
563
                        if (cbp & 32) {
564
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
565
                                return -1;
566
                        } else {
567
                            s->block_last_index[i] = -1;
568
                        }
569
                        cbp+=cbp;
570
                    }
571
                }
572
            }
573
        }else{
574
            for(i=0;i<12;i++)
575
                s->block_last_index[i] = -1;
576
        }
577
    }
578

    
579
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
580

    
581
    return 0;
582
}
583

    
584
/* as H.263, but only 17 codes */
585
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
586
{
587
    int code, sign, val, l, shift;
588

    
589
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
590
    if (code == 0) {
591
        return pred;
592
    }
593
    if (code < 0) {
594
        return 0xffff;
595
    }
596

    
597
    sign = get_bits1(&s->gb);
598
    shift = fcode - 1;
599
    val = code;
600
    if (shift) {
601
        val = (val - 1) << shift;
602
        val |= get_bits(&s->gb, shift);
603
        val++;
604
    }
605
    if (sign)
606
        val = -val;
607
    val += pred;
608

    
609
    /* modulo decoding */
610
    l= INT_BIT - 5 - shift;
611
    val = (val<<l)>>l;
612
    return val;
613
}
614

    
615
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
616
                               DCTELEM *block,
617
                               int n)
618
{
619
    int level, dc, diff, i, j, run;
620
    int component;
621
    RLTable *rl = &ff_rl_mpeg1;
622
    uint8_t * const scantable= s->intra_scantable.permutated;
623
    const uint16_t *quant_matrix= s->intra_matrix;
624
    const int qscale= s->qscale;
625

    
626
    /* DC coefficient */
627
    component = (n <= 3 ? 0 : n - 4 + 1);
628
    diff = decode_dc(&s->gb, component);
629
    if (diff >= 0xffff)
630
        return -1;
631
    dc = s->last_dc[component];
632
    dc += diff;
633
    s->last_dc[component] = dc;
634
    block[0] = dc*quant_matrix[0];
635
    av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
636
    i = 0;
637
    {
638
        OPEN_READER(re, &s->gb);
639
        /* now quantify & encode AC coefficients */
640
        for(;;) {
641
            UPDATE_CACHE(re, &s->gb);
642
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
643

    
644
            if(level == 127){
645
                break;
646
            } else if(level != 0) {
647
                i += run;
648
                j = scantable[i];
649
                level= (level*qscale*quant_matrix[j])>>4;
650
                level= (level-1)|1;
651
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
652
                LAST_SKIP_BITS(re, &s->gb, 1);
653
            } else {
654
                /* escape */
655
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
656
                UPDATE_CACHE(re, &s->gb);
657
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
658
                if (level == -128) {
659
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
660
                } else if (level == 0) {
661
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
662
                }
663
                i += run;
664
                j = scantable[i];
665
                if(level<0){
666
                    level= -level;
667
                    level= (level*qscale*quant_matrix[j])>>4;
668
                    level= (level-1)|1;
669
                    level= -level;
670
                }else{
671
                    level= (level*qscale*quant_matrix[j])>>4;
672
                    level= (level-1)|1;
673
                }
674
            }
675
            if (i > 63){
676
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
677
                return -1;
678
            }
679

    
680
            block[j] = level;
681
        }
682
        CLOSE_READER(re, &s->gb);
683
    }
684
    s->block_last_index[n] = i;
685
   return 0;
686
}
687

    
688
int ff_mpeg1_decode_block_intra(MpegEncContext *s,
689
                                DCTELEM *block,
690
                                int n)
691
{
692
    return mpeg1_decode_block_intra(s, block, n);
693
}
694

    
695
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
696
                               DCTELEM *block,
697
                               int n)
698
{
699
    int level, i, j, run;
700
    RLTable *rl = &ff_rl_mpeg1;
701
    uint8_t * const scantable= s->intra_scantable.permutated;
702
    const uint16_t *quant_matrix= s->inter_matrix;
703
    const int qscale= s->qscale;
704

    
705
    {
706
        OPEN_READER(re, &s->gb);
707
        i = -1;
708
        // special case for first coefficient, no need to add second VLC table
709
        UPDATE_CACHE(re, &s->gb);
710
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
711
            level= (3*qscale*quant_matrix[0])>>5;
712
            level= (level-1)|1;
713
            if(GET_CACHE(re, &s->gb)&0x40000000)
714
                level= -level;
715
            block[0] = level;
716
            i++;
717
            SKIP_BITS(re, &s->gb, 2);
718
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
719
                goto end;
720
        }
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(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
761
                break;
762
            UPDATE_CACHE(re, &s->gb);
763
        }
764
end:
765
        LAST_SKIP_BITS(re, &s->gb, 2);
766
        CLOSE_READER(re, &s->gb);
767
    }
768
    s->block_last_index[n] = i;
769
    return 0;
770
}
771

    
772
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
773
{
774
    int level, i, j, run;
775
    RLTable *rl = &ff_rl_mpeg1;
776
    uint8_t * const scantable= s->intra_scantable.permutated;
777
    const int qscale= s->qscale;
778

    
779
    {
780
        OPEN_READER(re, &s->gb);
781
        i = -1;
782
        // special case for first coefficient, no need to add second VLC table
783
        UPDATE_CACHE(re, &s->gb);
784
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
785
            level= (3*qscale)>>1;
786
            level= (level-1)|1;
787
            if(GET_CACHE(re, &s->gb)&0x40000000)
788
                level= -level;
789
            block[0] = level;
790
            i++;
791
            SKIP_BITS(re, &s->gb, 2);
792
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
793
                goto end;
794
        }
795

    
796
        /* now quantify & encode AC coefficients */
797
        for(;;) {
798
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
799

    
800
            if(level != 0) {
801
                i += run;
802
                j = scantable[i];
803
                level= ((level*2+1)*qscale)>>1;
804
                level= (level-1)|1;
805
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
806
                SKIP_BITS(re, &s->gb, 1);
807
            } else {
808
                /* escape */
809
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
810
                UPDATE_CACHE(re, &s->gb);
811
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
812
                if (level == -128) {
813
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
814
                } else if (level == 0) {
815
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
816
                }
817
                i += run;
818
                j = scantable[i];
819
                if(level<0){
820
                    level= -level;
821
                    level= ((level*2+1)*qscale)>>1;
822
                    level= (level-1)|1;
823
                    level= -level;
824
                }else{
825
                    level= ((level*2+1)*qscale)>>1;
826
                    level= (level-1)|1;
827
                }
828
            }
829

    
830
            block[j] = level;
831
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
832
                break;
833
            UPDATE_CACHE(re, &s->gb);
834
        }
835
end:
836
        LAST_SKIP_BITS(re, &s->gb, 2);
837
        CLOSE_READER(re, &s->gb);
838
    }
839
    s->block_last_index[n] = i;
840
    return 0;
841
}
842

    
843

    
844
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
845
                               DCTELEM *block,
846
                               int n)
847
{
848
    int level, i, j, run;
849
    RLTable *rl = &ff_rl_mpeg1;
850
    uint8_t * const scantable= s->intra_scantable.permutated;
851
    const uint16_t *quant_matrix;
852
    const int qscale= s->qscale;
853
    int mismatch;
854

    
855
    mismatch = 1;
856

    
857
    {
858
        OPEN_READER(re, &s->gb);
859
        i = -1;
860
        if (n < 4)
861
            quant_matrix = s->inter_matrix;
862
        else
863
            quant_matrix = s->chroma_inter_matrix;
864

    
865
        // special case for first coefficient, no need to add second VLC table
866
        UPDATE_CACHE(re, &s->gb);
867
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
868
            level= (3*qscale*quant_matrix[0])>>5;
869
            if(GET_CACHE(re, &s->gb)&0x40000000)
870
                level= -level;
871
            block[0] = level;
872
            mismatch ^= level;
873
            i++;
874
            SKIP_BITS(re, &s->gb, 2);
875
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
876
                goto end;
877
        }
878

    
879
        /* now quantify & encode AC coefficients */
880
        for(;;) {
881
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
882

    
883
            if(level != 0) {
884
                i += run;
885
                j = scantable[i];
886
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
887
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
888
                SKIP_BITS(re, &s->gb, 1);
889
            } else {
890
                /* escape */
891
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
892
                UPDATE_CACHE(re, &s->gb);
893
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
894

    
895
                i += run;
896
                j = scantable[i];
897
                if(level<0){
898
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
899
                    level= -level;
900
                }else{
901
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
902
                }
903
            }
904
            if (i > 63){
905
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
906
                return -1;
907
            }
908

    
909
            mismatch ^= level;
910
            block[j] = level;
911
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
912
                break;
913
            UPDATE_CACHE(re, &s->gb);
914
        }
915
end:
916
        LAST_SKIP_BITS(re, &s->gb, 2);
917
        CLOSE_READER(re, &s->gb);
918
    }
919
    block[63] ^= (mismatch & 1);
920

    
921
    s->block_last_index[n] = i;
922
    return 0;
923
}
924

    
925
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
926
                               DCTELEM *block,
927
                               int n)
928
{
929
    int level, i, j, run;
930
    RLTable *rl = &ff_rl_mpeg1;
931
    uint8_t * const scantable= s->intra_scantable.permutated;
932
    const int qscale= s->qscale;
933
    OPEN_READER(re, &s->gb);
934
    i = -1;
935

    
936
    // special case for first coefficient, no need to add second VLC table
937
    UPDATE_CACHE(re, &s->gb);
938
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
939
        level= (3*qscale)>>1;
940
        if(GET_CACHE(re, &s->gb)&0x40000000)
941
            level= -level;
942
        block[0] = level;
943
        i++;
944
        SKIP_BITS(re, &s->gb, 2);
945
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
946
            goto end;
947
    }
948

    
949
    /* now quantify & encode AC coefficients */
950
    for(;;) {
951
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
952

    
953
        if(level != 0) {
954
            i += run;
955
            j = scantable[i];
956
            level= ((level*2+1)*qscale)>>1;
957
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
958
            SKIP_BITS(re, &s->gb, 1);
959
        } else {
960
            /* escape */
961
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
962
            UPDATE_CACHE(re, &s->gb);
963
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
964

    
965
            i += run;
966
            j = scantable[i];
967
            if(level<0){
968
                level= ((-level*2+1)*qscale)>>1;
969
                level= -level;
970
            }else{
971
                level= ((level*2+1)*qscale)>>1;
972
            }
973
        }
974

    
975
        block[j] = level;
976
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
977
            break;
978
        UPDATE_CACHE(re, &s->gb);
979
    }
980
end:
981
    LAST_SKIP_BITS(re, &s->gb, 2);
982
    CLOSE_READER(re, &s->gb);
983
    s->block_last_index[n] = i;
984
    return 0;
985
}
986

    
987

    
988
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
989
                               DCTELEM *block,
990
                               int n)
991
{
992
    int level, dc, diff, i, j, run;
993
    int component;
994
    RLTable *rl;
995
    uint8_t * const scantable= s->intra_scantable.permutated;
996
    const uint16_t *quant_matrix;
997
    const int qscale= s->qscale;
998
    int mismatch;
999

    
1000
    /* DC coefficient */
1001
    if (n < 4){
1002
        quant_matrix = s->intra_matrix;
1003
        component = 0;
1004
    }else{
1005
        quant_matrix = s->chroma_intra_matrix;
1006
        component = (n&1) + 1;
1007
    }
1008
    diff = decode_dc(&s->gb, component);
1009
    if (diff >= 0xffff)
1010
        return -1;
1011
    dc = s->last_dc[component];
1012
    dc += diff;
1013
    s->last_dc[component] = dc;
1014
    block[0] = dc << (3 - s->intra_dc_precision);
1015
    av_dlog(s->avctx, "dc=%d\n", block[0]);
1016
    mismatch = block[0] ^ 1;
1017
    i = 0;
1018
    if (s->intra_vlc_format)
1019
        rl = &ff_rl_mpeg2;
1020
    else
1021
        rl = &ff_rl_mpeg1;
1022

    
1023
    {
1024
        OPEN_READER(re, &s->gb);
1025
        /* now quantify & encode AC coefficients */
1026
        for(;;) {
1027
            UPDATE_CACHE(re, &s->gb);
1028
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1029

    
1030
            if(level == 127){
1031
                break;
1032
            } else if(level != 0) {
1033
                i += run;
1034
                j = scantable[i];
1035
                level= (level*qscale*quant_matrix[j])>>4;
1036
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1037
                LAST_SKIP_BITS(re, &s->gb, 1);
1038
            } else {
1039
                /* escape */
1040
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1041
                UPDATE_CACHE(re, &s->gb);
1042
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1043
                i += run;
1044
                j = scantable[i];
1045
                if(level<0){
1046
                    level= (-level*qscale*quant_matrix[j])>>4;
1047
                    level= -level;
1048
                }else{
1049
                    level= (level*qscale*quant_matrix[j])>>4;
1050
                }
1051
            }
1052
            if (i > 63){
1053
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1054
                return -1;
1055
            }
1056

    
1057
            mismatch^= level;
1058
            block[j] = level;
1059
        }
1060
        CLOSE_READER(re, &s->gb);
1061
    }
1062
    block[63]^= mismatch&1;
1063

    
1064
    s->block_last_index[n] = i;
1065
    return 0;
1066
}
1067

    
1068
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1069
                               DCTELEM *block,
1070
                               int n)
1071
{
1072
    int level, dc, diff, j, run;
1073
    int component;
1074
    RLTable *rl;
1075
    uint8_t * scantable= s->intra_scantable.permutated;
1076
    const uint16_t *quant_matrix;
1077
    const int qscale= s->qscale;
1078

    
1079
    /* DC coefficient */
1080
    if (n < 4){
1081
        quant_matrix = s->intra_matrix;
1082
        component = 0;
1083
    }else{
1084
        quant_matrix = s->chroma_intra_matrix;
1085
        component = (n&1) + 1;
1086
    }
1087
    diff = decode_dc(&s->gb, component);
1088
    if (diff >= 0xffff)
1089
        return -1;
1090
    dc = s->last_dc[component];
1091
    dc += diff;
1092
    s->last_dc[component] = dc;
1093
    block[0] = dc << (3 - s->intra_dc_precision);
1094
    if (s->intra_vlc_format)
1095
        rl = &ff_rl_mpeg2;
1096
    else
1097
        rl = &ff_rl_mpeg1;
1098

    
1099
    {
1100
        OPEN_READER(re, &s->gb);
1101
        /* now quantify & encode AC coefficients */
1102
        for(;;) {
1103
            UPDATE_CACHE(re, &s->gb);
1104
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1105

    
1106
            if(level == 127){
1107
                break;
1108
            } else if(level != 0) {
1109
                scantable += run;
1110
                j = *scantable;
1111
                level= (level*qscale*quant_matrix[j])>>4;
1112
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1113
                LAST_SKIP_BITS(re, &s->gb, 1);
1114
            } else {
1115
                /* escape */
1116
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1117
                UPDATE_CACHE(re, &s->gb);
1118
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1119
                scantable += run;
1120
                j = *scantable;
1121
                if(level<0){
1122
                    level= (-level*qscale*quant_matrix[j])>>4;
1123
                    level= -level;
1124
                }else{
1125
                    level= (level*qscale*quant_matrix[j])>>4;
1126
                }
1127
            }
1128

    
1129
            block[j] = level;
1130
        }
1131
        CLOSE_READER(re, &s->gb);
1132
    }
1133

    
1134
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1135
    return 0;
1136
}
1137

    
1138
typedef struct Mpeg1Context {
1139
    MpegEncContext mpeg_enc_ctx;
1140
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1141
    int repeat_field; /* true if we must repeat the field */
1142
    AVPanScan pan_scan;              /**< some temporary storage for the panscan */
1143
    int slice_count;
1144
    int swap_uv;//indicate VCR2
1145
    int save_aspect_info;
1146
    int save_width, save_height, save_progressive_seq;
1147
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1148
    int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1149
} Mpeg1Context;
1150

    
1151
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1152
{
1153
    Mpeg1Context *s = avctx->priv_data;
1154
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1155
    int i;
1156

    
1157
    /* we need some permutation to store matrices,
1158
     * until MPV_common_init() sets the real permutation. */
1159
    for(i=0;i<64;i++)
1160
       s2->dsp.idct_permutation[i]=i;
1161

    
1162
    MPV_decode_defaults(s2);
1163

    
1164
    s->mpeg_enc_ctx.avctx= avctx;
1165
    s->mpeg_enc_ctx.flags= avctx->flags;
1166
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1167
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1168
    ff_mpeg12_init_vlcs();
1169

    
1170
    s->mpeg_enc_ctx_allocated = 0;
1171
    s->mpeg_enc_ctx.picture_number = 0;
1172
    s->repeat_field = 0;
1173
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1174
    avctx->color_range= AVCOL_RANGE_MPEG;
1175
    if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1176
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1177
    else
1178
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1179
    return 0;
1180
}
1181

    
1182
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1183
                                     const uint8_t *new_perm){
1184
    uint16_t temp_matrix[64];
1185
    int i;
1186

    
1187
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1188

    
1189
    for(i=0;i<64;i++){
1190
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1191
    }
1192
}
1193

    
1194
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1195
    Mpeg1Context *s1 = avctx->priv_data;
1196
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1197

    
1198
    if(avctx->xvmc_acceleration)
1199
        return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1200
    else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1201
        if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1202
            return PIX_FMT_VDPAU_MPEG1;
1203
        else
1204
            return PIX_FMT_VDPAU_MPEG2;
1205
    }else{
1206
        if(s->chroma_format <  2)
1207
            return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1208
        else if(s->chroma_format == 2)
1209
            return PIX_FMT_YUV422P;
1210
        else
1211
            return PIX_FMT_YUV444P;
1212
    }
1213
}
1214

    
1215
/* Call this function when we know all parameters.
1216
 * It may be called in different places for MPEG-1 and MPEG-2. */
1217
static int mpeg_decode_postinit(AVCodecContext *avctx){
1218
    Mpeg1Context *s1 = avctx->priv_data;
1219
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1220
    uint8_t old_permutation[64];
1221

    
1222
    if (
1223
        (s1->mpeg_enc_ctx_allocated == 0)||
1224
        avctx->coded_width  != s->width ||
1225
        avctx->coded_height != s->height||
1226
        s1->save_width != s->width ||
1227
        s1->save_height != s->height ||
1228
        s1->save_aspect_info != s->aspect_ratio_info||
1229
        s1->save_progressive_seq != s->progressive_sequence ||
1230
        0)
1231
    {
1232

    
1233
        if (s1->mpeg_enc_ctx_allocated) {
1234
            ParseContext pc= s->parse_context;
1235
            s->parse_context.buffer=0;
1236
            MPV_common_end(s);
1237
            s->parse_context= pc;
1238
        }
1239

    
1240
        if( (s->width == 0 )||(s->height == 0))
1241
            return -2;
1242

    
1243
        avcodec_set_dimensions(avctx, s->width, s->height);
1244
        avctx->bit_rate = s->bit_rate;
1245
        s1->save_aspect_info = s->aspect_ratio_info;
1246
        s1->save_width = s->width;
1247
        s1->save_height = s->height;
1248
        s1->save_progressive_seq = s->progressive_sequence;
1249

    
1250
        /* low_delay may be forced, in this case we will have B-frames
1251
         * that behave like P-frames. */
1252
        avctx->has_b_frames = !(s->low_delay);
1253

    
1254
        assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1255
        if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1256
            //MPEG-1 fps
1257
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1258
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1259
            //MPEG-1 aspect
1260
            avctx->sample_aspect_ratio= av_d2q(
1261
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1262
            avctx->ticks_per_frame=1;
1263
        }else{//MPEG-2
1264
        //MPEG-2 fps
1265
            av_reduce(
1266
                &s->avctx->time_base.den,
1267
                &s->avctx->time_base.num,
1268
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1269
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1270
                1<<30);
1271
            avctx->ticks_per_frame=2;
1272
        //MPEG-2 aspect
1273
            if(s->aspect_ratio_info > 1){
1274
                //we ignore the spec here as reality does not match the spec, see for example
1275
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1276
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1277
                    s->avctx->sample_aspect_ratio=
1278
                        av_div_q(
1279
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1280
                         (AVRational){s->width, s->height}
1281
                         );
1282
                }else{
1283
                    s->avctx->sample_aspect_ratio=
1284
                        av_div_q(
1285
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1286
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1287
                        );
1288
                }
1289
            }else{
1290
                s->avctx->sample_aspect_ratio=
1291
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1292
            }
1293
        }//MPEG-2
1294

    
1295
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1296
        avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1297
        //until then pix_fmt may be changed right after codec init
1298
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1299
            avctx->hwaccel ||
1300
            s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1301
            if( avctx->idct_algo == FF_IDCT_AUTO )
1302
                avctx->idct_algo = FF_IDCT_SIMPLE;
1303

    
1304
        /* Quantization matrices may need reordering
1305
         * if DCT permutation is changed. */
1306
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1307

    
1308
        if (MPV_common_init(s) < 0)
1309
            return -2;
1310

    
1311
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1312
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1313
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1314
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1315

    
1316
        s1->mpeg_enc_ctx_allocated = 1;
1317
    }
1318
    return 0;
1319
}
1320

    
1321
static int mpeg1_decode_picture(AVCodecContext *avctx,
1322
                                const uint8_t *buf, int buf_size)
1323
{
1324
    Mpeg1Context *s1 = avctx->priv_data;
1325
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1326
    int ref, f_code, vbv_delay;
1327

    
1328
    init_get_bits(&s->gb, buf, buf_size*8);
1329

    
1330
    ref = get_bits(&s->gb, 10); /* temporal ref */
1331
    s->pict_type = get_bits(&s->gb, 3);
1332
    if(s->pict_type == 0 || s->pict_type > 3)
1333
        return -1;
1334

    
1335
    vbv_delay= get_bits(&s->gb, 16);
1336
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1337
        s->full_pel[0] = get_bits1(&s->gb);
1338
        f_code = get_bits(&s->gb, 3);
1339
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1340
            return -1;
1341
        s->mpeg_f_code[0][0] = f_code;
1342
        s->mpeg_f_code[0][1] = f_code;
1343
    }
1344
    if (s->pict_type == FF_B_TYPE) {
1345
        s->full_pel[1] = get_bits1(&s->gb);
1346
        f_code = get_bits(&s->gb, 3);
1347
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1348
            return -1;
1349
        s->mpeg_f_code[1][0] = f_code;
1350
        s->mpeg_f_code[1][1] = f_code;
1351
    }
1352
    s->current_picture.pict_type= s->pict_type;
1353
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1354

    
1355
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1356
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1357

    
1358
    s->y_dc_scale = 8;
1359
    s->c_dc_scale = 8;
1360
    return 0;
1361
}
1362

    
1363
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1364
{
1365
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1366
    int horiz_size_ext, vert_size_ext;
1367
    int bit_rate_ext;
1368

    
1369
    skip_bits(&s->gb, 1); /* profile and level esc*/
1370
    s->avctx->profile= get_bits(&s->gb, 3);
1371
    s->avctx->level= get_bits(&s->gb, 4);
1372
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1373
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1374
    horiz_size_ext = get_bits(&s->gb, 2);
1375
    vert_size_ext = get_bits(&s->gb, 2);
1376
    s->width |= (horiz_size_ext << 12);
1377
    s->height |= (vert_size_ext << 12);
1378
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1379
    s->bit_rate += (bit_rate_ext << 18) * 400;
1380
    skip_bits1(&s->gb); /* marker */
1381
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1382

    
1383
    s->low_delay = get_bits1(&s->gb);
1384
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1385

    
1386
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1387
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1388

    
1389
    av_dlog(s->avctx, "sequence extension\n");
1390
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1391
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1392

    
1393
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1394
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1395
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1396

    
1397
}
1398

    
1399
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1400
{
1401
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1402
    int color_description, w, h;
1403

    
1404
    skip_bits(&s->gb, 3); /* video format */
1405
    color_description= get_bits1(&s->gb);
1406
    if(color_description){
1407
        s->avctx->color_primaries= get_bits(&s->gb, 8);
1408
        s->avctx->color_trc      = get_bits(&s->gb, 8);
1409
        s->avctx->colorspace     = get_bits(&s->gb, 8);
1410
    }
1411
    w= get_bits(&s->gb, 14);
1412
    skip_bits(&s->gb, 1); //marker
1413
    h= get_bits(&s->gb, 14);
1414
    // remaining 3 bits are zero padding
1415

    
1416
    s1->pan_scan.width= 16*w;
1417
    s1->pan_scan.height=16*h;
1418

    
1419
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1420
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1421
}
1422

    
1423
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1424
{
1425
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1426
    int i,nofco;
1427

    
1428
    nofco = 1;
1429
    if(s->progressive_sequence){
1430
        if(s->repeat_first_field){
1431
            nofco++;
1432
            if(s->top_field_first)
1433
                nofco++;
1434
        }
1435
    }else{
1436
        if(s->picture_structure == PICT_FRAME){
1437
            nofco++;
1438
            if(s->repeat_first_field)
1439
                nofco++;
1440
        }
1441
    }
1442
    for(i=0; i<nofco; i++){
1443
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1444
        skip_bits(&s->gb, 1); //marker
1445
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1446
        skip_bits(&s->gb, 1); //marker
1447
    }
1448

    
1449
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1450
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1451
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1452
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1453
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1454
        );
1455
}
1456

    
1457
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1458
    int i;
1459

    
1460
    for(i=0; i<64; i++) {
1461
        int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1462
        int v = get_bits(&s->gb, 8);
1463
        if(v==0){
1464
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1465
            return -1;
1466
        }
1467
        if(intra && i==0 && v!=8){
1468
            av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1469
            v= 8; // needed by pink.mpg / issue1046
1470
        }
1471
        matrix0[j] = v;
1472
        if(matrix1)
1473
            matrix1[j] = v;
1474
    }
1475
    return 0;
1476
}
1477

    
1478
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1479
{
1480
    av_dlog(s->avctx, "matrix extension\n");
1481

    
1482
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1483
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1484
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1485
    if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1486
}
1487

    
1488
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1489
{
1490
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1491

    
1492
    s->full_pel[0] = s->full_pel[1] = 0;
1493
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1494
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1495
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1496
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1497
    if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1498
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1499
        if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1500
            if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1501
                s->pict_type= FF_I_TYPE;
1502
            else
1503
                s->pict_type= FF_P_TYPE;
1504
        }else
1505
            s->pict_type= FF_B_TYPE;
1506
        s->current_picture.pict_type= s->pict_type;
1507
        s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1508
    }
1509
    s->intra_dc_precision = get_bits(&s->gb, 2);
1510
    s->picture_structure = get_bits(&s->gb, 2);
1511
    s->top_field_first = get_bits1(&s->gb);
1512
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1513
    s->concealment_motion_vectors = get_bits1(&s->gb);
1514
    s->q_scale_type = get_bits1(&s->gb);
1515
    s->intra_vlc_format = get_bits1(&s->gb);
1516
    s->alternate_scan = get_bits1(&s->gb);
1517
    s->repeat_first_field = get_bits1(&s->gb);
1518
    s->chroma_420_type = get_bits1(&s->gb);
1519
    s->progressive_frame = get_bits1(&s->gb);
1520

    
1521
    if(s->progressive_sequence && !s->progressive_frame){
1522
        s->progressive_frame= 1;
1523
        av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1524
    }
1525

    
1526
    if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1527
        av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1528
        s->picture_structure= PICT_FRAME;
1529
    }
1530

    
1531
    if(s->progressive_sequence && !s->frame_pred_frame_dct){
1532
        av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1533
        s->frame_pred_frame_dct= 1;
1534
    }
1535

    
1536
    if(s->picture_structure == PICT_FRAME){
1537
        s->first_field=0;
1538
        s->v_edge_pos= 16*s->mb_height;
1539
    }else{
1540
        s->first_field ^= 1;
1541
        s->v_edge_pos=  8*s->mb_height;
1542
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1543
    }
1544

    
1545
    if(s->alternate_scan){
1546
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1547
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1548
    }else{
1549
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1550
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1551
    }
1552

    
1553
    /* composite display not parsed */
1554
    av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1555
    av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1556
    av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1557
    av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1558
    av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1559
    av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1560
    av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1561
    av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1562
    av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1563
}
1564

    
1565
static void exchange_uv(MpegEncContext *s){
1566
    DCTELEM (*tmp)[64];
1567

    
1568
    tmp           = s->pblocks[4];
1569
    s->pblocks[4] = s->pblocks[5];
1570
    s->pblocks[5] = tmp;
1571
}
1572

    
1573
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1574
    AVCodecContext *avctx= s->avctx;
1575
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1576

    
1577
    /* start frame decoding */
1578
    if(s->first_field || s->picture_structure==PICT_FRAME){
1579
        if(MPV_frame_start(s, avctx) < 0)
1580
            return -1;
1581

    
1582
        ff_er_frame_start(s);
1583

    
1584
        /* first check if we must repeat the frame */
1585
        s->current_picture_ptr->repeat_pict = 0;
1586
        if (s->repeat_first_field) {
1587
            if (s->progressive_sequence) {
1588
                if (s->top_field_first)
1589
                    s->current_picture_ptr->repeat_pict = 4;
1590
                else
1591
                    s->current_picture_ptr->repeat_pict = 2;
1592
            } else if (s->progressive_frame) {
1593
                s->current_picture_ptr->repeat_pict = 1;
1594
            }
1595
        }
1596

    
1597
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1598
    }else{ //second field
1599
            int i;
1600

    
1601
            if(!s->current_picture_ptr){
1602
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1603
                return -1;
1604
            }
1605

    
1606
            for(i=0; i<4; i++){
1607
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1608
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1609
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1610
                }
1611
            }
1612
    }
1613

    
1614
    if (avctx->hwaccel) {
1615
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1616
            return -1;
1617
    }
1618

    
1619
// MPV_frame_start will call this function too,
1620
// but we need to call it on every field
1621
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1622
        if(ff_xvmc_field_start(s,avctx) < 0)
1623
            return -1;
1624

    
1625
    return 0;
1626
}
1627

    
1628
#define DECODE_SLICE_ERROR -1
1629
#define DECODE_SLICE_OK 0
1630

    
1631
/**
1632
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1633
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1634
 *         DECODE_SLICE_OK if this slice is ok<br>
1635
 */
1636
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1637
                             const uint8_t **buf, int buf_size)
1638
{
1639
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1640
    AVCodecContext *avctx= s->avctx;
1641
    const int field_pic= s->picture_structure != PICT_FRAME;
1642
    const int lowres= s->avctx->lowres;
1643

    
1644
    s->resync_mb_x=
1645
    s->resync_mb_y= -1;
1646

    
1647
    assert(mb_y < s->mb_height);
1648

    
1649
    init_get_bits(&s->gb, *buf, buf_size*8);
1650

    
1651
    ff_mpeg1_clean_buffers(s);
1652
    s->interlaced_dct = 0;
1653

    
1654
    s->qscale = get_qscale(s);
1655

    
1656
    if(s->qscale == 0){
1657
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1658
        return -1;
1659
    }
1660

    
1661
    /* extra slice info */
1662
    while (get_bits1(&s->gb) != 0) {
1663
        skip_bits(&s->gb, 8);
1664
    }
1665

    
1666
    s->mb_x=0;
1667

    
1668
    if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1669
        skip_bits1(&s->gb);
1670
    }else{
1671
        for(;;) {
1672
            int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1673
            if (code < 0){
1674
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1675
                return -1;
1676
            }
1677
            if (code >= 33) {
1678
                if (code == 33) {
1679
                    s->mb_x += 33;
1680
                }
1681
                /* otherwise, stuffing, nothing to do */
1682
            } else {
1683
                s->mb_x += code;
1684
                break;
1685
            }
1686
        }
1687
    }
1688

    
1689
    if(s->mb_x >= (unsigned)s->mb_width){
1690
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1691
        return -1;
1692
    }
1693

    
1694
    if (avctx->hwaccel) {
1695
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1696
        int start_code = -1;
1697
        buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1698
        if (buf_end < *buf + buf_size)
1699
            buf_end -= 4;
1700
        s->mb_y = mb_y;
1701
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1702
            return DECODE_SLICE_ERROR;
1703
        *buf = buf_end;
1704
        return DECODE_SLICE_OK;
1705
    }
1706

    
1707
    s->resync_mb_x= s->mb_x;
1708
    s->resync_mb_y= s->mb_y= mb_y;
1709
    s->mb_skip_run= 0;
1710
    ff_init_block_index(s);
1711

    
1712
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1713
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1714
             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",
1715
                 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],
1716
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1717
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1718
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1719
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1720
        }
1721
    }
1722

    
1723
    for(;;) {
1724
        //If 1, we memcpy blocks in xvmcvideo.
1725
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1726
            ff_xvmc_init_block(s);//set s->block
1727

    
1728
        if(mpeg_decode_mb(s, s->block) < 0)
1729
            return -1;
1730

    
1731
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1732
            const int wrap = s->b8_stride;
1733
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1734
            int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1735
            int motion_x, motion_y, dir, i;
1736

    
1737
            for(i=0; i<2; i++){
1738
                for(dir=0; dir<2; dir++){
1739
                    if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1740
                        motion_x = motion_y = 0;
1741
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1742
                        motion_x = s->mv[dir][0][0];
1743
                        motion_y = s->mv[dir][0][1];
1744
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1745
                        motion_x = s->mv[dir][i][0];
1746
                        motion_y = s->mv[dir][i][1];
1747
                    }
1748

    
1749
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1750
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1751
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1752
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1753
                    s->current_picture.ref_index [dir][b8_xy    ]=
1754
                    s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1755
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1756
                }
1757
                xy += wrap;
1758
                b8_xy +=2;
1759
            }
1760
        }
1761

    
1762
        s->dest[0] += 16 >> lowres;
1763
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1764
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1765

    
1766
        MPV_decode_mb(s, s->block);
1767

    
1768
        if (++s->mb_x >= s->mb_width) {
1769
            const int mb_size= 16>>s->avctx->lowres;
1770

    
1771
            ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1772

    
1773
            s->mb_x = 0;
1774
            s->mb_y += 1<<field_pic;
1775

    
1776
            if(s->mb_y >= s->mb_height){
1777
                int left= get_bits_left(&s->gb);
1778
                int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1779
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1780
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1781

    
1782
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1783
                   || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1784
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1785
                    return -1;
1786
                }else
1787
                    goto eos;
1788
            }
1789

    
1790
            ff_init_block_index(s);
1791
        }
1792

    
1793
        /* skip mb handling */
1794
        if (s->mb_skip_run == -1) {
1795
            /* read increment again */
1796
            s->mb_skip_run = 0;
1797
            for(;;) {
1798
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1799
                if (code < 0){
1800
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1801
                    return -1;
1802
                }
1803
                if (code >= 33) {
1804
                    if (code == 33) {
1805
                        s->mb_skip_run += 33;
1806
                    }else if(code == 35){
1807
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1808
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1809
                            return -1;
1810
                        }
1811
                        goto eos; /* end of slice */
1812
                    }
1813
                    /* otherwise, stuffing, nothing to do */
1814
                } else {
1815
                    s->mb_skip_run += code;
1816
                    break;
1817
                }
1818
            }
1819
            if(s->mb_skip_run){
1820
                int i;
1821
                if(s->pict_type == FF_I_TYPE){
1822
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1823
                    return -1;
1824
                }
1825

    
1826
                /* skip mb */
1827
                s->mb_intra = 0;
1828
                for(i=0;i<12;i++)
1829
                    s->block_last_index[i] = -1;
1830
                if(s->picture_structure == PICT_FRAME)
1831
                    s->mv_type = MV_TYPE_16X16;
1832
                else
1833
                    s->mv_type = MV_TYPE_FIELD;
1834
                if (s->pict_type == FF_P_TYPE) {
1835
                    /* if P type, zero motion vector is implied */
1836
                    s->mv_dir = MV_DIR_FORWARD;
1837
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1838
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1839
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1840
                    s->field_select[0][0]= (s->picture_structure - 1) & 1;
1841
                } else {
1842
                    /* if B type, reuse previous vectors and directions */
1843
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1844
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1845
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1846
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1847
                }
1848
            }
1849
        }
1850
    }
1851
eos: // end of slice
1852
    *buf += (get_bits_count(&s->gb)-1)/8;
1853
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1854
    return 0;
1855
}
1856

    
1857
static int slice_decode_thread(AVCodecContext *c, void *arg){
1858
    MpegEncContext *s= *(void**)arg;
1859
    const uint8_t *buf= s->gb.buffer;
1860
    int mb_y= s->start_mb_y;
1861
    const int field_pic= s->picture_structure != PICT_FRAME;
1862

    
1863
    s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1864

    
1865
    for(;;){
1866
        uint32_t start_code;
1867
        int ret;
1868

    
1869
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1870
        emms_c();
1871
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1872
//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);
1873
        if(ret < 0){
1874
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1875
                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);
1876
        }else{
1877
            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);
1878
        }
1879

    
1880
        if(s->mb_y == s->end_mb_y)
1881
            return 0;
1882

    
1883
        start_code= -1;
1884
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1885
        mb_y= start_code - SLICE_MIN_START_CODE;
1886
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1887
            return -1;
1888
    }
1889

    
1890
    return 0; //not reached
1891
}
1892

    
1893
/**
1894
 * Handle slice ends.
1895
 * @return 1 if it seems to be the last slice
1896
 */
1897
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1898
{
1899
    Mpeg1Context *s1 = avctx->priv_data;
1900
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1901

    
1902
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1903
        return 0;
1904

    
1905
    if (s->avctx->hwaccel) {
1906
        if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1907
            av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1908
    }
1909

    
1910
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1911
        ff_xvmc_field_end(s);
1912

    
1913
    /* end of slice reached */
1914
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1915
        /* end of image */
1916

    
1917
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1918

    
1919
        ff_er_frame_end(s);
1920

    
1921
        MPV_frame_end(s);
1922

    
1923
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1924
            *pict= *(AVFrame*)s->current_picture_ptr;
1925
            ff_print_debug_info(s, pict);
1926
        } else {
1927
            s->picture_number++;
1928
            /* latency of 1 frame for I- and P-frames */
1929
            /* XXX: use another variable than picture_number */
1930
            if (s->last_picture_ptr != NULL) {
1931
                *pict= *(AVFrame*)s->last_picture_ptr;
1932
                 ff_print_debug_info(s, pict);
1933
            }
1934
        }
1935

    
1936
        return 1;
1937
    } else {
1938
        return 0;
1939
    }
1940
}
1941

    
1942
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1943
                                 const uint8_t *buf, int buf_size)
1944
{
1945
    Mpeg1Context *s1 = avctx->priv_data;
1946
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1947
    int width,height;
1948
    int i, v, j;
1949

    
1950
    init_get_bits(&s->gb, buf, buf_size*8);
1951

    
1952
    width = get_bits(&s->gb, 12);
1953
    height = get_bits(&s->gb, 12);
1954
    if (width <= 0 || height <= 0)
1955
        return -1;
1956
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1957
    if (s->aspect_ratio_info == 0) {
1958
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1959
        if (avctx->error_recognition >= FF_ER_COMPLIANT)
1960
            return -1;
1961
    }
1962
    s->frame_rate_index = get_bits(&s->gb, 4);
1963
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1964
        return -1;
1965
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1966
    if (get_bits1(&s->gb) == 0) /* marker */
1967
        return -1;
1968
    s->width = width;
1969
    s->height = height;
1970

    
1971
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1972
    skip_bits(&s->gb, 1);
1973

    
1974
    /* get matrix */
1975
    if (get_bits1(&s->gb)) {
1976
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1977
    } else {
1978
        for(i=0;i<64;i++) {
1979
            j = s->dsp.idct_permutation[i];
1980
            v = ff_mpeg1_default_intra_matrix[i];
1981
            s->intra_matrix[j] = v;
1982
            s->chroma_intra_matrix[j] = v;
1983
        }
1984
    }
1985
    if (get_bits1(&s->gb)) {
1986
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1987
    } else {
1988
        for(i=0;i<64;i++) {
1989
            int j= s->dsp.idct_permutation[i];
1990
            v = ff_mpeg1_default_non_intra_matrix[i];
1991
            s->inter_matrix[j] = v;
1992
            s->chroma_inter_matrix[j] = v;
1993
        }
1994
    }
1995

    
1996
    if(show_bits(&s->gb, 23) != 0){
1997
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
1998
        return -1;
1999
    }
2000

    
2001
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2002
    s->progressive_sequence = 1;
2003
    s->progressive_frame = 1;
2004
    s->picture_structure = PICT_FRAME;
2005
    s->frame_pred_frame_dct = 1;
2006
    s->chroma_format = 1;
2007
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2008
    avctx->sub_id = 1; /* indicates MPEG-1 */
2009
    s->out_format = FMT_MPEG1;
2010
    s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2011
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2012

    
2013
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2014
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2015
               s->avctx->rc_buffer_size, s->bit_rate);
2016

    
2017
    return 0;
2018
}
2019

    
2020
static int vcr2_init_sequence(AVCodecContext *avctx)
2021
{
2022
    Mpeg1Context *s1 = avctx->priv_data;
2023
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2024
    int i, v;
2025

    
2026
    /* start new MPEG-1 context decoding */
2027
    s->out_format = FMT_MPEG1;
2028
    if (s1->mpeg_enc_ctx_allocated) {
2029
        MPV_common_end(s);
2030
    }
2031
    s->width  = avctx->coded_width;
2032
    s->height = avctx->coded_height;
2033
    avctx->has_b_frames= 0; //true?
2034
    s->low_delay= 1;
2035

    
2036
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2037
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2038

    
2039
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2040
        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2041
        if( avctx->idct_algo == FF_IDCT_AUTO )
2042
            avctx->idct_algo = FF_IDCT_SIMPLE;
2043

    
2044
    if (MPV_common_init(s) < 0)
2045
        return -1;
2046
    exchange_uv(s);//common init reset pblocks, so we swap them here
2047
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2048
    s1->mpeg_enc_ctx_allocated = 1;
2049

    
2050
    for(i=0;i<64;i++) {
2051
        int j= s->dsp.idct_permutation[i];
2052
        v = ff_mpeg1_default_intra_matrix[i];
2053
        s->intra_matrix[j] = v;
2054
        s->chroma_intra_matrix[j] = v;
2055

    
2056
        v = ff_mpeg1_default_non_intra_matrix[i];
2057
        s->inter_matrix[j] = v;
2058
        s->chroma_inter_matrix[j] = v;
2059
    }
2060

    
2061
    s->progressive_sequence = 1;
2062
    s->progressive_frame = 1;
2063
    s->picture_structure = PICT_FRAME;
2064
    s->frame_pred_frame_dct = 1;
2065
    s->chroma_format = 1;
2066
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2067
    avctx->sub_id = 2; /* indicates MPEG-2 */
2068
    s1->save_width           = s->width;
2069
    s1->save_height          = s->height;
2070
    s1->save_progressive_seq = s->progressive_sequence;
2071
    return 0;
2072
}
2073

    
2074

    
2075
static void mpeg_decode_user_data(AVCodecContext *avctx,
2076
                                  const uint8_t *p, int buf_size)
2077
{
2078
    const uint8_t *buf_end = p+buf_size;
2079

    
2080
    /* we parse the DTG active format information */
2081
    if (buf_end - p >= 5 &&
2082
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2083
        int flags = p[4];
2084
        p += 5;
2085
        if (flags & 0x80) {
2086
            /* skip event id */
2087
            p += 2;
2088
        }
2089
        if (flags & 0x40) {
2090
            if (buf_end - p < 1)
2091
                return;
2092
            avctx->dtg_active_format = p[0] & 0x0f;
2093
        }
2094
    }
2095
}
2096

    
2097
static void mpeg_decode_gop(AVCodecContext *avctx,
2098
                            const uint8_t *buf, int buf_size){
2099
    Mpeg1Context *s1 = avctx->priv_data;
2100
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2101

    
2102
    int drop_frame_flag;
2103
    int time_code_hours, time_code_minutes;
2104
    int time_code_seconds, time_code_pictures;
2105
    int broken_link;
2106

    
2107
    init_get_bits(&s->gb, buf, buf_size*8);
2108

    
2109
    drop_frame_flag = get_bits1(&s->gb);
2110

    
2111
    time_code_hours=get_bits(&s->gb,5);
2112
    time_code_minutes = get_bits(&s->gb,6);
2113
    skip_bits1(&s->gb);//marker bit
2114
    time_code_seconds = get_bits(&s->gb,6);
2115
    time_code_pictures = get_bits(&s->gb,6);
2116

    
2117
    s->closed_gop = get_bits1(&s->gb);
2118
    /*broken_link indicate that after editing the
2119
      reference frames of the first B-Frames after GOP I-Frame
2120
      are missing (open gop)*/
2121
    broken_link = get_bits1(&s->gb);
2122

    
2123
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2124
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2125
            time_code_hours, time_code_minutes, time_code_seconds,
2126
            time_code_pictures, s->closed_gop, broken_link);
2127
}
2128
/**
2129
 * Find the end of the current frame in the bitstream.
2130
 * @return the position of the first byte of the next frame, or -1
2131
 */
2132
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2133
{
2134
    int i;
2135
    uint32_t state= pc->state;
2136

    
2137
    /* EOF considered as end of frame */
2138
    if (buf_size == 0)
2139
        return 0;
2140

    
2141
/*
2142
 0  frame start         -> 1/4
2143
 1  first_SEQEXT        -> 0/2
2144
 2  first field start   -> 3/0
2145
 3  second_SEQEXT       -> 2/0
2146
 4  searching end
2147
*/
2148

    
2149
    for(i=0; i<buf_size; i++){
2150
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2151
        if(pc->frame_start_found&1){
2152
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2153
                pc->frame_start_found--;
2154
            else if(state == EXT_START_CODE+2){
2155
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2156
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2157
            }
2158
            state++;
2159
        }else{
2160
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2161
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2162
                i++;
2163
                pc->frame_start_found=4;
2164
            }
2165
            if(state == SEQ_END_CODE){
2166
                pc->state=-1;
2167
                return i+1;
2168
            }
2169
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2170
                pc->frame_start_found= 0;
2171
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2172
                pc->frame_start_found++;
2173
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2174
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2175
                    pc->frame_start_found=0;
2176
                    pc->state=-1;
2177
                    return i-3;
2178
                }
2179
            }
2180
            if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2181
                ff_fetch_timestamp(s, i-3, 1);
2182
            }
2183
        }
2184
    }
2185
    pc->state= state;
2186
    return END_NOT_FOUND;
2187
}
2188

    
2189
static int decode_chunks(AVCodecContext *avctx,
2190
                             AVFrame *picture, int *data_size,
2191
                             const uint8_t *buf, int buf_size);
2192

    
2193
/* handle buffering and image synchronisation */
2194
static int mpeg_decode_frame(AVCodecContext *avctx,
2195
                             void *data, int *data_size,
2196
                             AVPacket *avpkt)
2197
{
2198
    const uint8_t *buf = avpkt->data;
2199
    int buf_size = avpkt->size;
2200
    Mpeg1Context *s = avctx->priv_data;
2201
    AVFrame *picture = data;
2202
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2203
    av_dlog(avctx, "fill_buffer\n");
2204

    
2205
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2206
        /* special case for last picture */
2207
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2208
            *picture= *(AVFrame*)s2->next_picture_ptr;
2209
            s2->next_picture_ptr= NULL;
2210

    
2211
            *data_size = sizeof(AVFrame);
2212
        }
2213
        return buf_size;
2214
    }
2215

    
2216
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2217
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2218

    
2219
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2220
            return buf_size;
2221
    }
2222

    
2223
#if 0
2224
    if (s->repeat_field % 2 == 1) {
2225
        s->repeat_field++;
2226
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2227
        //        s2->picture_number, s->repeat_field);
2228
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2229
            *data_size = sizeof(AVPicture);
2230
            goto the_end;
2231
        }
2232
    }
2233
#endif
2234

    
2235
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2236
        vcr2_init_sequence(avctx);
2237

    
2238
    s->slice_count= 0;
2239

    
2240
    if(avctx->extradata && !avctx->frame_number)
2241
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2242

    
2243
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2244
}
2245

    
2246
static int decode_chunks(AVCodecContext *avctx,
2247
                             AVFrame *picture, int *data_size,
2248
                             const uint8_t *buf, int buf_size)
2249
{
2250
    Mpeg1Context *s = avctx->priv_data;
2251
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2252
    const uint8_t *buf_ptr = buf;
2253
    const uint8_t *buf_end = buf + buf_size;
2254
    int ret, input_size;
2255
    int last_code= 0;
2256

    
2257
    for(;;) {
2258
        /* find next start code */
2259
        uint32_t start_code = -1;
2260
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2261
        if (start_code > 0x1ff){
2262
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2263
                if(avctx->thread_count > 1){
2264
                    int i;
2265

    
2266
                    avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2267
                    for(i=0; i<s->slice_count; i++)
2268
                        s2->error_count += s2->thread_context[i]->error_count;
2269
                }
2270

    
2271
                if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2272
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2273

    
2274
                if (slice_end(avctx, picture)) {
2275
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2276
                        *data_size = sizeof(AVPicture);
2277
                }
2278
            }
2279
            s2->pict_type= 0;
2280
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2281
        }
2282

    
2283
        input_size = buf_end - buf_ptr;
2284

    
2285
        if(avctx->debug & FF_DEBUG_STARTCODE){
2286
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2287
        }
2288

    
2289
        /* prepare data for next start code */
2290
        switch(start_code) {
2291
        case SEQ_START_CODE:
2292
            if(last_code == 0){
2293
            mpeg1_decode_sequence(avctx, buf_ptr,
2294
                                    input_size);
2295
                s->sync=1;
2296
            }else{
2297
                av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2298
            }
2299
            break;
2300

    
2301
        case PICTURE_START_CODE:
2302
            if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2303
            if(mpeg_decode_postinit(avctx) < 0){
2304
                av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2305
                return -1;
2306
            }
2307

    
2308
            /* we have a complete image: we try to decompress it */
2309
            if(mpeg1_decode_picture(avctx,
2310
                                    buf_ptr, input_size) < 0)
2311
                s2->pict_type=0;
2312
                s2->first_slice = 1;
2313
            last_code= PICTURE_START_CODE;
2314
            }else{
2315
                av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2316
            }
2317
            break;
2318
        case EXT_START_CODE:
2319
            init_get_bits(&s2->gb, buf_ptr, input_size*8);
2320

    
2321
            switch(get_bits(&s2->gb, 4)) {
2322
            case 0x1:
2323
                if(last_code == 0){
2324
                mpeg_decode_sequence_extension(s);
2325
                }else{
2326
                    av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2327
                }
2328
                break;
2329
            case 0x2:
2330
                mpeg_decode_sequence_display_extension(s);
2331
                break;
2332
            case 0x3:
2333
                mpeg_decode_quant_matrix_extension(s2);
2334
                break;
2335
            case 0x7:
2336
                mpeg_decode_picture_display_extension(s);
2337
                break;
2338
            case 0x8:
2339
                if(last_code == PICTURE_START_CODE){
2340
                mpeg_decode_picture_coding_extension(s);
2341
                }else{
2342
                    av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2343
                }
2344
                break;
2345
            }
2346
            break;
2347
        case USER_START_CODE:
2348
            mpeg_decode_user_data(avctx,
2349
                                    buf_ptr, input_size);
2350
            break;
2351
        case GOP_START_CODE:
2352
            if(last_code == 0){
2353
            s2->first_field=0;
2354
            mpeg_decode_gop(avctx,
2355
                                    buf_ptr, input_size);
2356
                s->sync=1;
2357
            }else{
2358
                av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2359
            }
2360
            break;
2361
        default:
2362
            if (start_code >= SLICE_MIN_START_CODE &&
2363
                start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2364
                const int field_pic= s2->picture_structure != PICT_FRAME;
2365
                int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2366
                last_code= SLICE_MIN_START_CODE;
2367

    
2368
                if(s2->picture_structure == PICT_BOTTOM_FIELD)
2369
                    mb_y++;
2370

    
2371
                if (mb_y >= s2->mb_height){
2372
                    av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2373
                    return -1;
2374
                }
2375

    
2376
                if(s2->last_picture_ptr==NULL){
2377
                /* Skip B-frames if we do not have reference frames and gop is not closed */
2378
                    if(s2->pict_type==FF_B_TYPE){
2379
                        if(!s2->closed_gop)
2380
                            break;
2381
                    }
2382
                }
2383
                if(s2->pict_type==FF_I_TYPE)
2384
                    s->sync=1;
2385
                if(s2->next_picture_ptr==NULL){
2386
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2387
                    if(s2->pict_type==FF_P_TYPE && !s->sync) break;
2388
                }
2389
                /* Skip B-frames if we are in a hurry. */
2390
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2391
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2392
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2393
                    || avctx->skip_frame >= AVDISCARD_ALL)
2394
                    break;
2395
                /* Skip everything if we are in a hurry>=5. */
2396
                if(avctx->hurry_up>=5) break;
2397

    
2398
                if (!s->mpeg_enc_ctx_allocated) break;
2399

    
2400
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2401
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2402
                        break;
2403
                }
2404

    
2405
                if(!s2->pict_type){
2406
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2407
                    break;
2408
                }
2409

    
2410
                if(s2->first_slice){
2411
                    s2->first_slice=0;
2412
                    if(mpeg_field_start(s2, buf, buf_size) < 0)
2413
                        return -1;
2414
                }
2415
                if(!s2->current_picture_ptr){
2416
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2417
                    return -1;
2418
                }
2419

    
2420
                if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2421
                    s->slice_count++;
2422
                    break;
2423
                }
2424

    
2425
                if(avctx->thread_count > 1){
2426
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2427
                    if(threshold <= mb_y){
2428
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2429

    
2430
                        thread_context->start_mb_y= mb_y;
2431
                        thread_context->end_mb_y  = s2->mb_height;
2432
                        if(s->slice_count){
2433
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2434
                            ff_update_duplicate_context(thread_context, s2);
2435
                        }
2436
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2437
                        s->slice_count++;
2438
                    }
2439
                    buf_ptr += 2; //FIXME add minimum number of bytes per slice
2440
                }else{
2441
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2442
                    emms_c();
2443

    
2444
                    if(ret < 0){
2445
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2446
                            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);
2447
                    }else{
2448
                        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);
2449
                    }
2450
                }
2451
            }
2452
            break;
2453
        }
2454
    }
2455
}
2456

    
2457
static void flush(AVCodecContext *avctx){
2458
    Mpeg1Context *s = avctx->priv_data;
2459

    
2460
    s->sync=0;
2461

    
2462
    ff_mpeg_flush(avctx);
2463
}
2464

    
2465
static int mpeg_decode_end(AVCodecContext *avctx)
2466
{
2467
    Mpeg1Context *s = avctx->priv_data;
2468

    
2469
    if (s->mpeg_enc_ctx_allocated)
2470
        MPV_common_end(&s->mpeg_enc_ctx);
2471
    return 0;
2472
}
2473

    
2474
AVCodec ff_mpeg1video_decoder = {
2475
    "mpeg1video",
2476
    AVMEDIA_TYPE_VIDEO,
2477
    CODEC_ID_MPEG1VIDEO,
2478
    sizeof(Mpeg1Context),
2479
    mpeg_decode_init,
2480
    NULL,
2481
    mpeg_decode_end,
2482
    mpeg_decode_frame,
2483
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2484
    .flush= flush,
2485
    .max_lowres= 3,
2486
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2487
};
2488

    
2489
AVCodec ff_mpeg2video_decoder = {
2490
    "mpeg2video",
2491
    AVMEDIA_TYPE_VIDEO,
2492
    CODEC_ID_MPEG2VIDEO,
2493
    sizeof(Mpeg1Context),
2494
    mpeg_decode_init,
2495
    NULL,
2496
    mpeg_decode_end,
2497
    mpeg_decode_frame,
2498
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2499
    .flush= flush,
2500
    .max_lowres= 3,
2501
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2502
};
2503

    
2504
//legacy decoder
2505
AVCodec ff_mpegvideo_decoder = {
2506
    "mpegvideo",
2507
    AVMEDIA_TYPE_VIDEO,
2508
    CODEC_ID_MPEG2VIDEO,
2509
    sizeof(Mpeg1Context),
2510
    mpeg_decode_init,
2511
    NULL,
2512
    mpeg_decode_end,
2513
    mpeg_decode_frame,
2514
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2515
    .flush= flush,
2516
    .max_lowres= 3,
2517
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2518
};
2519

    
2520
#if CONFIG_MPEG_XVMC_DECODER
2521
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2522
    if( avctx->thread_count > 1)
2523
        return -1;
2524
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2525
        return -1;
2526
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2527
        av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2528
    }
2529
    mpeg_decode_init(avctx);
2530

    
2531
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2532
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2533

    
2534
    return 0;
2535
}
2536

    
2537
AVCodec ff_mpeg_xvmc_decoder = {
2538
    "mpegvideo_xvmc",
2539
    AVMEDIA_TYPE_VIDEO,
2540
    CODEC_ID_MPEG2VIDEO_XVMC,
2541
    sizeof(Mpeg1Context),
2542
    mpeg_mc_decode_init,
2543
    NULL,
2544
    mpeg_decode_end,
2545
    mpeg_decode_frame,
2546
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2547
    .flush= flush,
2548
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2549
};
2550

    
2551
#endif
2552

    
2553
#if CONFIG_MPEG_VDPAU_DECODER
2554
AVCodec ff_mpeg_vdpau_decoder = {
2555
    "mpegvideo_vdpau",
2556
    AVMEDIA_TYPE_VIDEO,
2557
    CODEC_ID_MPEG2VIDEO,
2558
    sizeof(Mpeg1Context),
2559
    mpeg_decode_init,
2560
    NULL,
2561
    mpeg_decode_end,
2562
    mpeg_decode_frame,
2563
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2564
    .flush= flush,
2565
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2566
};
2567
#endif
2568

    
2569
#if CONFIG_MPEG1_VDPAU_DECODER
2570
AVCodec ff_mpeg1_vdpau_decoder = {
2571
    "mpeg1video_vdpau",
2572
    AVMEDIA_TYPE_VIDEO,
2573
    CODEC_ID_MPEG1VIDEO,
2574
    sizeof(Mpeg1Context),
2575
    mpeg_decode_init,
2576
    NULL,
2577
    mpeg_decode_end,
2578
    mpeg_decode_frame,
2579
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2580
    .flush= flush,
2581
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2582
};
2583
#endif
2584