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ffmpeg / libavcodec / mpeg12.c @ 6ec87fbd

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1
/*
2
 * MPEG1/2 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
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 * 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 mpeg12.c
25
 * MPEG1/2 decoder
26
 */
27

    
28
//#define DEBUG
29
#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
32

    
33
#include "mpeg12.h"
34
#include "mpeg12data.h"
35
#include "mpeg12decdata.h"
36
#include "bytestream.h"
37

    
38
//#undef NDEBUG
39
//#include <assert.h>
40

    
41

    
42
#define DC_VLC_BITS 9
43
#define MV_VLC_BITS 9
44
#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
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#define TEX_VLC_BITS 9
49

    
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
53
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
56
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
57
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
58
                                        DCTELEM *block,
59
                                        int n);
60
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
61
                                    DCTELEM *block,
62
                                    int n);
63
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
64
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
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static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
66
static void exchange_uv(MpegEncContext *s);
67

    
68
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
69
extern int XVMC_field_end(MpegEncContext *s);
70
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
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extern void XVMC_init_block(MpegEncContext *s);//set s->block
72

    
73
static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,PIX_FMT_NONE};
74
static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,PIX_FMT_NONE};
75
static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,PIX_FMT_NONE};
76
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
77
                                           PIX_FMT_XVMC_MPEG2_IDCT,
78
                                           PIX_FMT_XVMC_MPEG2_MC,
79
                                           PIX_FMT_NONE};
80

    
81
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
82

    
83

    
84
#define INIT_2D_VLC_RL(rl, static_size)\
85
{\
86
    static RL_VLC_ELEM rl_vlc_table[static_size];\
87
    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
88
             &rl.table_vlc[0][1], 4, 2,\
89
             &rl.table_vlc[0][0], 4, 2, static_size);\
90
\
91
    rl.rl_vlc[0]= rl_vlc_table;\
92
    init_2d_vlc_rl(&rl);\
93
}
94

    
95
static void init_2d_vlc_rl(RLTable *rl)
96
{
97
    int i;
98

    
99
    for(i=0; i<rl->vlc.table_size; i++){
100
        int code= rl->vlc.table[i][0];
101
        int len = rl->vlc.table[i][1];
102
        int level, run;
103

    
104
        if(len==0){ // illegal code
105
            run= 65;
106
            level= MAX_LEVEL;
107
        }else if(len<0){ //more bits needed
108
            run= 0;
109
            level= code;
110
        }else{
111
            if(code==rl->n){ //esc
112
                run= 65;
113
                level= 0;
114
            }else if(code==rl->n+1){ //eob
115
                run= 0;
116
                level= 127;
117
            }else{
118
                run=   rl->table_run  [code] + 1;
119
                level= rl->table_level[code];
120
            }
121
        }
122
        rl->rl_vlc[0][i].len= len;
123
        rl->rl_vlc[0][i].level= level;
124
        rl->rl_vlc[0][i].run= run;
125
    }
126
}
127

    
128
void ff_mpeg12_common_init(MpegEncContext *s)
129
{
130

    
131
    s->y_dc_scale_table=
132
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
133

    
134
}
135

    
136
void ff_mpeg1_clean_buffers(MpegEncContext *s){
137
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
138
    s->last_dc[1] = s->last_dc[0];
139
    s->last_dc[2] = s->last_dc[0];
140
    memset(s->last_mv, 0, sizeof(s->last_mv));
141
}
142

    
143

    
144
/******************************************/
145
/* decoding */
146

    
147
static VLC dc_lum_vlc;
148
static VLC dc_chroma_vlc;
149
static VLC mv_vlc;
150
static VLC mbincr_vlc;
151
static VLC mb_ptype_vlc;
152
static VLC mb_btype_vlc;
153
static VLC mb_pat_vlc;
154

    
155
static av_cold void init_vlcs(void)
156
{
157
    static int done = 0;
158

    
159
    if (!done) {
160
        done = 1;
161

    
162
        INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
163
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
164
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
165
        INIT_VLC_STATIC(&dc_chroma_vlc,  DC_VLC_BITS, 12,
166
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
167
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
168
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
169
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
170
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
171
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
172
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
173
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
174
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
175
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
176
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
177

    
178
        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
179
                 &table_mb_ptype[0][1], 2, 1,
180
                 &table_mb_ptype[0][0], 2, 1, 64);
181
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
182
                 &table_mb_btype[0][1], 2, 1,
183
                 &table_mb_btype[0][0], 2, 1, 64);
184
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
185
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
186

    
187
        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
188
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
189
    }
190
}
191

    
192
static inline int get_dmv(MpegEncContext *s)
193
{
194
    if(get_bits1(&s->gb))
195
        return 1 - (get_bits1(&s->gb) << 1);
196
    else
197
        return 0;
198
}
199

    
200
static inline int get_qscale(MpegEncContext *s)
201
{
202
    int qscale = get_bits(&s->gb, 5);
203
    if (s->q_scale_type) {
204
        return non_linear_qscale[qscale];
205
    } else {
206
        return qscale << 1;
207
    }
208
}
209

    
210
/* motion type (for mpeg2) */
211
#define MT_FIELD 1
212
#define MT_FRAME 2
213
#define MT_16X8  2
214
#define MT_DMV   3
215

    
216
static int mpeg_decode_mb(MpegEncContext *s,
217
                          DCTELEM block[12][64])
218
{
219
    int i, j, k, cbp, val, mb_type, motion_type;
220
    const int mb_block_count = 4 + (1<< s->chroma_format);
221

    
222
    dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
223

    
224
    assert(s->mb_skipped==0);
225

    
226
    if (s->mb_skip_run-- != 0) {
227
        if (s->pict_type == FF_P_TYPE) {
228
            s->mb_skipped = 1;
229
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
230
        } else {
231
            int mb_type;
232

    
233
            if(s->mb_x)
234
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
235
            else
236
                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,
237
            if(IS_INTRA(mb_type))
238
                return -1;
239

    
240
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
241
                mb_type | MB_TYPE_SKIP;
242
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
243

    
244
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
245
                s->mb_skipped = 1;
246
        }
247

    
248
        return 0;
249
    }
250

    
251
    switch(s->pict_type) {
252
    default:
253
    case FF_I_TYPE:
254
        if (get_bits1(&s->gb) == 0) {
255
            if (get_bits1(&s->gb) == 0){
256
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
257
                return -1;
258
            }
259
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
260
        } else {
261
            mb_type = MB_TYPE_INTRA;
262
        }
263
        break;
264
    case FF_P_TYPE:
265
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
266
        if (mb_type < 0){
267
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
268
            return -1;
269
        }
270
        mb_type = ptype2mb_type[ mb_type ];
271
        break;
272
    case FF_B_TYPE:
273
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
274
        if (mb_type < 0){
275
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
276
            return -1;
277
        }
278
        mb_type = btype2mb_type[ mb_type ];
279
        break;
280
    }
281
    dprintf(s->avctx, "mb_type=%x\n", mb_type);
282
//    motion_type = 0; /* avoid warning */
283
    if (IS_INTRA(mb_type)) {
284
        s->dsp.clear_blocks(s->block[0]);
285

    
286
        if(!s->chroma_y_shift){
287
            s->dsp.clear_blocks(s->block[6]);
288
        }
289

    
290
        /* compute dct type */
291
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
292
            !s->frame_pred_frame_dct) {
293
            s->interlaced_dct = get_bits1(&s->gb);
294
        }
295

    
296
        if (IS_QUANT(mb_type))
297
            s->qscale = get_qscale(s);
298

    
299
        if (s->concealment_motion_vectors) {
300
            /* just parse them */
301
            if (s->picture_structure != PICT_FRAME)
302
                skip_bits1(&s->gb); /* field select */
303

    
304
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
305
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
306
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
307
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
308

    
309
            skip_bits1(&s->gb); /* marker */
310
        }else
311
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
312
        s->mb_intra = 1;
313
#ifdef HAVE_XVMC
314
        //one 1 we memcpy blocks in xvmcvideo
315
        if(s->avctx->xvmc_acceleration > 1){
316
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
317
            if(s->swap_uv){
318
                exchange_uv(s);
319
            }
320
        }
321
#endif
322

    
323
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
324
            if(s->flags2 & CODEC_FLAG2_FAST){
325
                for(i=0;i<6;i++) {
326
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
327
                }
328
            }else{
329
                for(i=0;i<mb_block_count;i++) {
330
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
331
                        return -1;
332
                }
333
            }
334
        } else {
335
            for(i=0;i<6;i++) {
336
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
337
                    return -1;
338
            }
339
        }
340
    } else {
341
        if (mb_type & MB_TYPE_ZERO_MV){
342
            assert(mb_type & MB_TYPE_CBP);
343

    
344
            s->mv_dir = MV_DIR_FORWARD;
345
            if(s->picture_structure == PICT_FRAME){
346
                if(!s->frame_pred_frame_dct)
347
                    s->interlaced_dct = get_bits1(&s->gb);
348
                s->mv_type = MV_TYPE_16X16;
349
            }else{
350
                s->mv_type = MV_TYPE_FIELD;
351
                mb_type |= MB_TYPE_INTERLACED;
352
                s->field_select[0][0]= s->picture_structure - 1;
353
            }
354

    
355
            if (IS_QUANT(mb_type))
356
                s->qscale = get_qscale(s);
357

    
358
            s->last_mv[0][0][0] = 0;
359
            s->last_mv[0][0][1] = 0;
360
            s->last_mv[0][1][0] = 0;
361
            s->last_mv[0][1][1] = 0;
362
            s->mv[0][0][0] = 0;
363
            s->mv[0][0][1] = 0;
364
        }else{
365
            assert(mb_type & MB_TYPE_L0L1);
366
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
367
            /* get additional motion vector type */
368
            if (s->frame_pred_frame_dct)
369
                motion_type = MT_FRAME;
370
            else{
371
                motion_type = get_bits(&s->gb, 2);
372
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
373
                    s->interlaced_dct = get_bits1(&s->gb);
374
            }
375

    
376
            if (IS_QUANT(mb_type))
377
                s->qscale = get_qscale(s);
378

    
379
            /* motion vectors */
380
            s->mv_dir= (mb_type>>13)&3;
381
            dprintf(s->avctx, "motion_type=%d\n", motion_type);
382
            switch(motion_type) {
383
            case MT_FRAME: /* or MT_16X8 */
384
                if (s->picture_structure == PICT_FRAME) {
385
                    mb_type |= MB_TYPE_16x16;
386
                    s->mv_type = MV_TYPE_16X16;
387
                    for(i=0;i<2;i++) {
388
                        if (USES_LIST(mb_type, i)) {
389
                            /* MT_FRAME */
390
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
391
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
392
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
393
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
394
                            /* full_pel: only for mpeg1 */
395
                            if (s->full_pel[i]){
396
                                s->mv[i][0][0] <<= 1;
397
                                s->mv[i][0][1] <<= 1;
398
                            }
399
                        }
400
                    }
401
                } else {
402
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
403
                    s->mv_type = MV_TYPE_16X8;
404
                    for(i=0;i<2;i++) {
405
                        if (USES_LIST(mb_type, i)) {
406
                            /* MT_16X8 */
407
                            for(j=0;j<2;j++) {
408
                                s->field_select[i][j] = get_bits1(&s->gb);
409
                                for(k=0;k<2;k++) {
410
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
411
                                                             s->last_mv[i][j][k]);
412
                                    s->last_mv[i][j][k] = val;
413
                                    s->mv[i][j][k] = val;
414
                                }
415
                            }
416
                        }
417
                    }
418
                }
419
                break;
420
            case MT_FIELD:
421
                s->mv_type = MV_TYPE_FIELD;
422
                if (s->picture_structure == PICT_FRAME) {
423
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
424
                    for(i=0;i<2;i++) {
425
                        if (USES_LIST(mb_type, i)) {
426
                            for(j=0;j<2;j++) {
427
                                s->field_select[i][j] = get_bits1(&s->gb);
428
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
429
                                                         s->last_mv[i][j][0]);
430
                                s->last_mv[i][j][0] = val;
431
                                s->mv[i][j][0] = val;
432
                                dprintf(s->avctx, "fmx=%d\n", val);
433
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
434
                                                         s->last_mv[i][j][1] >> 1);
435
                                s->last_mv[i][j][1] = val << 1;
436
                                s->mv[i][j][1] = val;
437
                                dprintf(s->avctx, "fmy=%d\n", val);
438
                            }
439
                        }
440
                    }
441
                } else {
442
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
443
                    for(i=0;i<2;i++) {
444
                        if (USES_LIST(mb_type, i)) {
445
                            s->field_select[i][0] = get_bits1(&s->gb);
446
                            for(k=0;k<2;k++) {
447
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
448
                                                         s->last_mv[i][0][k]);
449
                                s->last_mv[i][0][k] = val;
450
                                s->last_mv[i][1][k] = val;
451
                                s->mv[i][0][k] = val;
452
                            }
453
                        }
454
                    }
455
                }
456
                break;
457
            case MT_DMV:
458
                s->mv_type = MV_TYPE_DMV;
459
                for(i=0;i<2;i++) {
460
                    if (USES_LIST(mb_type, i)) {
461
                        int dmx, dmy, mx, my, m;
462
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
463
                                                s->last_mv[i][0][0]);
464
                        s->last_mv[i][0][0] = mx;
465
                        s->last_mv[i][1][0] = mx;
466
                        dmx = get_dmv(s);
467
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
468
                                                s->last_mv[i][0][1] >> 1);
469
                        dmy = get_dmv(s);
470

    
471

    
472
                        s->last_mv[i][0][1] = my<<1;
473
                        s->last_mv[i][1][1] = my<<1;
474

    
475
                        s->mv[i][0][0] = mx;
476
                        s->mv[i][0][1] = my;
477
                        s->mv[i][1][0] = mx;//not used
478
                        s->mv[i][1][1] = my;//not used
479

    
480
                        if (s->picture_structure == PICT_FRAME) {
481
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
482

    
483
                            //m = 1 + 2 * s->top_field_first;
484
                            m = s->top_field_first ? 1 : 3;
485

    
486
                            /* top -> top pred */
487
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
488
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
489
                            m = 4 - m;
490
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
491
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
492
                        } else {
493
                            mb_type |= MB_TYPE_16x16;
494

    
495
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
496
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
497
                            if(s->picture_structure == PICT_TOP_FIELD)
498
                                s->mv[i][2][1]--;
499
                            else
500
                                s->mv[i][2][1]++;
501
                        }
502
                    }
503
                }
504
                break;
505
            default:
506
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
507
                return -1;
508
            }
509
        }
510

    
511
        s->mb_intra = 0;
512
        if (HAS_CBP(mb_type)) {
513
            s->dsp.clear_blocks(s->block[0]);
514

    
515
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
516
            if(mb_block_count > 6){
517
                 cbp<<= mb_block_count-6;
518
                 cbp |= get_bits(&s->gb, mb_block_count-6);
519
                 s->dsp.clear_blocks(s->block[6]);
520
            }
521
            if (cbp <= 0){
522
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
523
                return -1;
524
            }
525

    
526
#ifdef HAVE_XVMC
527
            //on 1 we memcpy blocks in xvmcvideo
528
            if(s->avctx->xvmc_acceleration > 1){
529
                XVMC_pack_pblocks(s,cbp);
530
                if(s->swap_uv){
531
                    exchange_uv(s);
532
                }
533
            }
534
#endif
535

    
536
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
537
                if(s->flags2 & CODEC_FLAG2_FAST){
538
                    for(i=0;i<6;i++) {
539
                        if(cbp & 32) {
540
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
541
                        } else {
542
                            s->block_last_index[i] = -1;
543
                        }
544
                        cbp+=cbp;
545
                    }
546
                }else{
547
                    cbp<<= 12-mb_block_count;
548

    
549
                    for(i=0;i<mb_block_count;i++) {
550
                        if ( cbp & (1<<11) ) {
551
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
552
                                return -1;
553
                        } else {
554
                            s->block_last_index[i] = -1;
555
                        }
556
                        cbp+=cbp;
557
                    }
558
                }
559
            } else {
560
                if(s->flags2 & CODEC_FLAG2_FAST){
561
                    for(i=0;i<6;i++) {
562
                        if (cbp & 32) {
563
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
564
                        } else {
565
                            s->block_last_index[i] = -1;
566
                        }
567
                        cbp+=cbp;
568
                    }
569
                }else{
570
                    for(i=0;i<6;i++) {
571
                        if (cbp & 32) {
572
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
573
                                return -1;
574
                        } else {
575
                            s->block_last_index[i] = -1;
576
                        }
577
                        cbp+=cbp;
578
                    }
579
                }
580
            }
581
        }else{
582
            for(i=0;i<12;i++)
583
                s->block_last_index[i] = -1;
584
        }
585
    }
586

    
587
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
588

    
589
    return 0;
590
}
591

    
592
/* as h263, but only 17 codes */
593
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
594
{
595
    int code, sign, val, l, shift;
596

    
597
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
598
    if (code == 0) {
599
        return pred;
600
    }
601
    if (code < 0) {
602
        return 0xffff;
603
    }
604

    
605
    sign = get_bits1(&s->gb);
606
    shift = fcode - 1;
607
    val = code;
608
    if (shift) {
609
        val = (val - 1) << shift;
610
        val |= get_bits(&s->gb, shift);
611
        val++;
612
    }
613
    if (sign)
614
        val = -val;
615
    val += pred;
616

    
617
    /* modulo decoding */
618
    l= INT_BIT - 5 - shift;
619
    val = (val<<l)>>l;
620
    return val;
621
}
622

    
623
static inline int decode_dc(GetBitContext *gb, int component)
624
{
625
    int code, diff;
626

    
627
    if (component == 0) {
628
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
629
    } else {
630
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
631
    }
632
    if (code < 0){
633
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
634
        return 0xffff;
635
    }
636
    if (code == 0) {
637
        diff = 0;
638
    } else {
639
        diff = get_xbits(gb, code);
640
    }
641
    return diff;
642
}
643

    
644
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
645
                               DCTELEM *block,
646
                               int n)
647
{
648
    int level, dc, diff, i, j, run;
649
    int component;
650
    RLTable *rl = &ff_rl_mpeg1;
651
    uint8_t * const scantable= s->intra_scantable.permutated;
652
    const uint16_t *quant_matrix= s->intra_matrix;
653
    const int qscale= s->qscale;
654

    
655
    /* DC coef */
656
    component = (n <= 3 ? 0 : n - 4 + 1);
657
    diff = decode_dc(&s->gb, component);
658
    if (diff >= 0xffff)
659
        return -1;
660
    dc = s->last_dc[component];
661
    dc += diff;
662
    s->last_dc[component] = dc;
663
    block[0] = dc<<3;
664
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
665
    i = 0;
666
    {
667
        OPEN_READER(re, &s->gb);
668
        /* now quantify & encode AC coefs */
669
        for(;;) {
670
            UPDATE_CACHE(re, &s->gb);
671
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
672

    
673
            if(level == 127){
674
                break;
675
            } else if(level != 0) {
676
                i += run;
677
                j = scantable[i];
678
                level= (level*qscale*quant_matrix[j])>>4;
679
                level= (level-1)|1;
680
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
681
                LAST_SKIP_BITS(re, &s->gb, 1);
682
            } else {
683
                /* escape */
684
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
685
                UPDATE_CACHE(re, &s->gb);
686
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
687
                if (level == -128) {
688
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
689
                } else if (level == 0) {
690
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
691
                }
692
                i += run;
693
                j = scantable[i];
694
                if(level<0){
695
                    level= -level;
696
                    level= (level*qscale*quant_matrix[j])>>4;
697
                    level= (level-1)|1;
698
                    level= -level;
699
                }else{
700
                    level= (level*qscale*quant_matrix[j])>>4;
701
                    level= (level-1)|1;
702
                }
703
            }
704
            if (i > 63){
705
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
706
                return -1;
707
            }
708

    
709
            block[j] = level;
710
        }
711
        CLOSE_READER(re, &s->gb);
712
    }
713
    s->block_last_index[n] = i;
714
   return 0;
715
}
716

    
717
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
718
                               DCTELEM *block,
719
                               int n)
720
{
721
    int level, i, j, run;
722
    RLTable *rl = &ff_rl_mpeg1;
723
    uint8_t * const scantable= s->intra_scantable.permutated;
724
    const uint16_t *quant_matrix= s->inter_matrix;
725
    const int qscale= s->qscale;
726

    
727
    {
728
        OPEN_READER(re, &s->gb);
729
        i = -1;
730
        /* special case for the first coef. no need to add a second vlc table */
731
        UPDATE_CACHE(re, &s->gb);
732
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
733
            level= (3*qscale*quant_matrix[0])>>5;
734
            level= (level-1)|1;
735
            if(GET_CACHE(re, &s->gb)&0x40000000)
736
                level= -level;
737
            block[0] = level;
738
            i++;
739
            SKIP_BITS(re, &s->gb, 2);
740
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
741
                goto end;
742
        }
743
#if MIN_CACHE_BITS < 19
744
        UPDATE_CACHE(re, &s->gb);
745
#endif
746
        /* now quantify & encode AC coefs */
747
        for(;;) {
748
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
749

    
750
            if(level != 0) {
751
                i += run;
752
                j = scantable[i];
753
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
754
                level= (level-1)|1;
755
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
756
                SKIP_BITS(re, &s->gb, 1);
757
            } else {
758
                /* escape */
759
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
760
                UPDATE_CACHE(re, &s->gb);
761
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
762
                if (level == -128) {
763
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
764
                } else if (level == 0) {
765
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
766
                }
767
                i += run;
768
                j = scantable[i];
769
                if(level<0){
770
                    level= -level;
771
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
772
                    level= (level-1)|1;
773
                    level= -level;
774
                }else{
775
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
776
                    level= (level-1)|1;
777
                }
778
            }
779
            if (i > 63){
780
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
781
                return -1;
782
            }
783

    
784
            block[j] = level;
785
#if MIN_CACHE_BITS < 19
786
            UPDATE_CACHE(re, &s->gb);
787
#endif
788
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
789
                break;
790
#if MIN_CACHE_BITS >= 19
791
            UPDATE_CACHE(re, &s->gb);
792
#endif
793
        }
794
end:
795
        LAST_SKIP_BITS(re, &s->gb, 2);
796
        CLOSE_READER(re, &s->gb);
797
    }
798
    s->block_last_index[n] = i;
799
    return 0;
800
}
801

    
802
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
803
{
804
    int level, i, j, run;
805
    RLTable *rl = &ff_rl_mpeg1;
806
    uint8_t * const scantable= s->intra_scantable.permutated;
807
    const int qscale= s->qscale;
808

    
809
    {
810
        OPEN_READER(re, &s->gb);
811
        i = -1;
812
        /* special case for the first coef. no need to add a second vlc table */
813
        UPDATE_CACHE(re, &s->gb);
814
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
815
            level= (3*qscale)>>1;
816
            level= (level-1)|1;
817
            if(GET_CACHE(re, &s->gb)&0x40000000)
818
                level= -level;
819
            block[0] = level;
820
            i++;
821
            SKIP_BITS(re, &s->gb, 2);
822
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
823
                goto end;
824
        }
825
#if MIN_CACHE_BITS < 19
826
        UPDATE_CACHE(re, &s->gb);
827
#endif
828

    
829
        /* now quantify & encode AC coefs */
830
        for(;;) {
831
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
832

    
833
            if(level != 0) {
834
                i += run;
835
                j = scantable[i];
836
                level= ((level*2+1)*qscale)>>1;
837
                level= (level-1)|1;
838
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
839
                SKIP_BITS(re, &s->gb, 1);
840
            } else {
841
                /* escape */
842
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
843
                UPDATE_CACHE(re, &s->gb);
844
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
845
                if (level == -128) {
846
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
847
                } else if (level == 0) {
848
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
849
                }
850
                i += run;
851
                j = scantable[i];
852
                if(level<0){
853
                    level= -level;
854
                    level= ((level*2+1)*qscale)>>1;
855
                    level= (level-1)|1;
856
                    level= -level;
857
                }else{
858
                    level= ((level*2+1)*qscale)>>1;
859
                    level= (level-1)|1;
860
                }
861
            }
862

    
863
            block[j] = level;
864
#if MIN_CACHE_BITS < 19
865
            UPDATE_CACHE(re, &s->gb);
866
#endif
867
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
868
                break;
869
#if MIN_CACHE_BITS >= 19
870
            UPDATE_CACHE(re, &s->gb);
871
#endif
872
        }
873
end:
874
        LAST_SKIP_BITS(re, &s->gb, 2);
875
        CLOSE_READER(re, &s->gb);
876
    }
877
    s->block_last_index[n] = i;
878
    return 0;
879
}
880

    
881

    
882
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
883
                               DCTELEM *block,
884
                               int n)
885
{
886
    int level, i, j, run;
887
    RLTable *rl = &ff_rl_mpeg1;
888
    uint8_t * const scantable= s->intra_scantable.permutated;
889
    const uint16_t *quant_matrix;
890
    const int qscale= s->qscale;
891
    int mismatch;
892

    
893
    mismatch = 1;
894

    
895
    {
896
        OPEN_READER(re, &s->gb);
897
        i = -1;
898
        if (n < 4)
899
            quant_matrix = s->inter_matrix;
900
        else
901
            quant_matrix = s->chroma_inter_matrix;
902

    
903
        /* special case for the first coef. no need to add a second vlc table */
904
        UPDATE_CACHE(re, &s->gb);
905
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
906
            level= (3*qscale*quant_matrix[0])>>5;
907
            if(GET_CACHE(re, &s->gb)&0x40000000)
908
                level= -level;
909
            block[0] = level;
910
            mismatch ^= level;
911
            i++;
912
            SKIP_BITS(re, &s->gb, 2);
913
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
914
                goto end;
915
        }
916
#if MIN_CACHE_BITS < 19
917
        UPDATE_CACHE(re, &s->gb);
918
#endif
919

    
920
        /* now quantify & encode AC coefs */
921
        for(;;) {
922
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
923

    
924
            if(level != 0) {
925
                i += run;
926
                j = scantable[i];
927
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
928
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
929
                SKIP_BITS(re, &s->gb, 1);
930
            } else {
931
                /* escape */
932
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
933
                UPDATE_CACHE(re, &s->gb);
934
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
935

    
936
                i += run;
937
                j = scantable[i];
938
                if(level<0){
939
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
940
                    level= -level;
941
                }else{
942
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
943
                }
944
            }
945
            if (i > 63){
946
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
947
                return -1;
948
            }
949

    
950
            mismatch ^= level;
951
            block[j] = level;
952
#if MIN_CACHE_BITS < 19
953
            UPDATE_CACHE(re, &s->gb);
954
#endif
955
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
956
                break;
957
#if MIN_CACHE_BITS >= 19
958
            UPDATE_CACHE(re, &s->gb);
959
#endif
960
        }
961
end:
962
        LAST_SKIP_BITS(re, &s->gb, 2);
963
        CLOSE_READER(re, &s->gb);
964
    }
965
    block[63] ^= (mismatch & 1);
966

    
967
    s->block_last_index[n] = i;
968
    return 0;
969
}
970

    
971
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
972
                               DCTELEM *block,
973
                               int n)
974
{
975
    int level, i, j, run;
976
    RLTable *rl = &ff_rl_mpeg1;
977
    uint8_t * const scantable= s->intra_scantable.permutated;
978
    const int qscale= s->qscale;
979
    OPEN_READER(re, &s->gb);
980
    i = -1;
981

    
982
    /* special case for the first coef. no need to add a second vlc table */
983
    UPDATE_CACHE(re, &s->gb);
984
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
985
        level= (3*qscale)>>1;
986
        if(GET_CACHE(re, &s->gb)&0x40000000)
987
            level= -level;
988
        block[0] = level;
989
        i++;
990
        SKIP_BITS(re, &s->gb, 2);
991
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
992
            goto end;
993
    }
994
#if MIN_CACHE_BITS < 19
995
    UPDATE_CACHE(re, &s->gb);
996
#endif
997

    
998
    /* now quantify & encode AC coefs */
999
    for(;;) {
1000
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1001

    
1002
        if(level != 0) {
1003
            i += run;
1004
            j = scantable[i];
1005
            level= ((level*2+1)*qscale)>>1;
1006
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1007
            SKIP_BITS(re, &s->gb, 1);
1008
        } else {
1009
            /* escape */
1010
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1011
            UPDATE_CACHE(re, &s->gb);
1012
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1013

    
1014
            i += run;
1015
            j = scantable[i];
1016
            if(level<0){
1017
                level= ((-level*2+1)*qscale)>>1;
1018
                level= -level;
1019
            }else{
1020
                level= ((level*2+1)*qscale)>>1;
1021
            }
1022
        }
1023

    
1024
        block[j] = level;
1025
#if MIN_CACHE_BITS < 19
1026
        UPDATE_CACHE(re, &s->gb);
1027
#endif
1028
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1029
            break;
1030
#if MIN_CACHE_BITS >=19
1031
        UPDATE_CACHE(re, &s->gb);
1032
#endif
1033
    }
1034
end:
1035
    LAST_SKIP_BITS(re, &s->gb, 2);
1036
    CLOSE_READER(re, &s->gb);
1037
    s->block_last_index[n] = i;
1038
    return 0;
1039
}
1040

    
1041

    
1042
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1043
                               DCTELEM *block,
1044
                               int n)
1045
{
1046
    int level, dc, diff, i, j, run;
1047
    int component;
1048
    RLTable *rl;
1049
    uint8_t * const scantable= s->intra_scantable.permutated;
1050
    const uint16_t *quant_matrix;
1051
    const int qscale= s->qscale;
1052
    int mismatch;
1053

    
1054
    /* DC coef */
1055
    if (n < 4){
1056
        quant_matrix = s->intra_matrix;
1057
        component = 0;
1058
    }else{
1059
        quant_matrix = s->chroma_intra_matrix;
1060
        component = (n&1) + 1;
1061
    }
1062
    diff = decode_dc(&s->gb, component);
1063
    if (diff >= 0xffff)
1064
        return -1;
1065
    dc = s->last_dc[component];
1066
    dc += diff;
1067
    s->last_dc[component] = dc;
1068
    block[0] = dc << (3 - s->intra_dc_precision);
1069
    dprintf(s->avctx, "dc=%d\n", block[0]);
1070
    mismatch = block[0] ^ 1;
1071
    i = 0;
1072
    if (s->intra_vlc_format)
1073
        rl = &ff_rl_mpeg2;
1074
    else
1075
        rl = &ff_rl_mpeg1;
1076

    
1077
    {
1078
        OPEN_READER(re, &s->gb);
1079
        /* now quantify & encode AC coefs */
1080
        for(;;) {
1081
            UPDATE_CACHE(re, &s->gb);
1082
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1083

    
1084
            if(level == 127){
1085
                break;
1086
            } else if(level != 0) {
1087
                i += run;
1088
                j = scantable[i];
1089
                level= (level*qscale*quant_matrix[j])>>4;
1090
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1091
                LAST_SKIP_BITS(re, &s->gb, 1);
1092
            } else {
1093
                /* escape */
1094
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1095
                UPDATE_CACHE(re, &s->gb);
1096
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1097
                i += run;
1098
                j = scantable[i];
1099
                if(level<0){
1100
                    level= (-level*qscale*quant_matrix[j])>>4;
1101
                    level= -level;
1102
                }else{
1103
                    level= (level*qscale*quant_matrix[j])>>4;
1104
                }
1105
            }
1106
            if (i > 63){
1107
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1108
                return -1;
1109
            }
1110

    
1111
            mismatch^= level;
1112
            block[j] = level;
1113
        }
1114
        CLOSE_READER(re, &s->gb);
1115
    }
1116
    block[63]^= mismatch&1;
1117

    
1118
    s->block_last_index[n] = i;
1119
    return 0;
1120
}
1121

    
1122
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1123
                               DCTELEM *block,
1124
                               int n)
1125
{
1126
    int level, dc, diff, j, run;
1127
    int component;
1128
    RLTable *rl;
1129
    uint8_t * scantable= s->intra_scantable.permutated;
1130
    const uint16_t *quant_matrix;
1131
    const int qscale= s->qscale;
1132

    
1133
    /* DC coef */
1134
    if (n < 4){
1135
        quant_matrix = s->intra_matrix;
1136
        component = 0;
1137
    }else{
1138
        quant_matrix = s->chroma_intra_matrix;
1139
        component = (n&1) + 1;
1140
    }
1141
    diff = decode_dc(&s->gb, component);
1142
    if (diff >= 0xffff)
1143
        return -1;
1144
    dc = s->last_dc[component];
1145
    dc += diff;
1146
    s->last_dc[component] = dc;
1147
    block[0] = dc << (3 - s->intra_dc_precision);
1148
    if (s->intra_vlc_format)
1149
        rl = &ff_rl_mpeg2;
1150
    else
1151
        rl = &ff_rl_mpeg1;
1152

    
1153
    {
1154
        OPEN_READER(re, &s->gb);
1155
        /* now quantify & encode AC coefs */
1156
        for(;;) {
1157
            UPDATE_CACHE(re, &s->gb);
1158
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1159

    
1160
            if(level == 127){
1161
                break;
1162
            } else if(level != 0) {
1163
                scantable += run;
1164
                j = *scantable;
1165
                level= (level*qscale*quant_matrix[j])>>4;
1166
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1167
                LAST_SKIP_BITS(re, &s->gb, 1);
1168
            } else {
1169
                /* escape */
1170
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1171
                UPDATE_CACHE(re, &s->gb);
1172
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1173
                scantable += run;
1174
                j = *scantable;
1175
                if(level<0){
1176
                    level= (-level*qscale*quant_matrix[j])>>4;
1177
                    level= -level;
1178
                }else{
1179
                    level= (level*qscale*quant_matrix[j])>>4;
1180
                }
1181
            }
1182

    
1183
            block[j] = level;
1184
        }
1185
        CLOSE_READER(re, &s->gb);
1186
    }
1187

    
1188
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1189
    return 0;
1190
}
1191

    
1192
typedef struct Mpeg1Context {
1193
    MpegEncContext mpeg_enc_ctx;
1194
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1195
    int repeat_field; /* true if we must repeat the field */
1196
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1197
    int slice_count;
1198
    int swap_uv;//indicate VCR2
1199
    int save_aspect_info;
1200
    int save_width, save_height;
1201
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1202

    
1203
} Mpeg1Context;
1204

    
1205
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1206
{
1207
    Mpeg1Context *s = avctx->priv_data;
1208
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1209
    int i;
1210

    
1211
    //we need some parmutation to store
1212
    //matrixes, until MPV_common_init()
1213
    //set the real permutatuon
1214
    for(i=0;i<64;i++)
1215
       s2->dsp.idct_permutation[i]=i;
1216

    
1217
    MPV_decode_defaults(s2);
1218

    
1219
    s->mpeg_enc_ctx.avctx= avctx;
1220
    s->mpeg_enc_ctx.flags= avctx->flags;
1221
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1222
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1223
    init_vlcs();
1224

    
1225
    s->mpeg_enc_ctx_allocated = 0;
1226
    s->mpeg_enc_ctx.picture_number = 0;
1227
    s->repeat_field = 0;
1228
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1229
    return 0;
1230
}
1231

    
1232
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1233
                                     const uint8_t *new_perm){
1234
    uint16_t temp_matrix[64];
1235
    int i;
1236

    
1237
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1238

    
1239
    for(i=0;i<64;i++){
1240
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1241
    }
1242
}
1243

    
1244
//Call this function when we know all parameters
1245
//it may be called in different places for mpeg1 and mpeg2
1246
static int mpeg_decode_postinit(AVCodecContext *avctx){
1247
    Mpeg1Context *s1 = avctx->priv_data;
1248
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1249
    uint8_t old_permutation[64];
1250

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

    
1261
        if (s1->mpeg_enc_ctx_allocated) {
1262
            ParseContext pc= s->parse_context;
1263
            s->parse_context.buffer=0;
1264
            MPV_common_end(s);
1265
            s->parse_context= pc;
1266
        }
1267

    
1268
        if( (s->width == 0 )||(s->height == 0))
1269
            return -2;
1270

    
1271
        avcodec_set_dimensions(avctx, s->width, s->height);
1272
        avctx->bit_rate = s->bit_rate;
1273
        s1->save_aspect_info = s->aspect_ratio_info;
1274
        s1->save_width = s->width;
1275
        s1->save_height = s->height;
1276

    
1277
     //low_delay may be forced, in this case we will have B frames
1278
     //that behave like P frames
1279
        avctx->has_b_frames = !(s->low_delay);
1280

    
1281
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1282
            //mpeg1 fps
1283
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1284
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1285
            //mpeg1 aspect
1286
            avctx->sample_aspect_ratio= av_d2q(
1287
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1288

    
1289
        }else{//mpeg2
1290
        //mpeg2 fps
1291
            av_reduce(
1292
                &s->avctx->time_base.den,
1293
                &s->avctx->time_base.num,
1294
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1295
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1296
                1<<30);
1297
        //mpeg2 aspect
1298
            if(s->aspect_ratio_info > 1){
1299
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1300
                    s->avctx->sample_aspect_ratio=
1301
                        av_div_q(
1302
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1303
                         (AVRational){s->width, s->height}
1304
                         );
1305
                }else{
1306
                    s->avctx->sample_aspect_ratio=
1307
                        av_div_q(
1308
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1309
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1310
                        );
1311
                }
1312
            }else{
1313
                s->avctx->sample_aspect_ratio=
1314
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1315
            }
1316
        }//mpeg2
1317

    
1318
        if(avctx->xvmc_acceleration){
1319
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1320
        }else{
1321
            if(s->chroma_format <  2){
1322
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1323
            }else
1324
            if(s->chroma_format == 2){
1325
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1326
            }else
1327
            if(s->chroma_format >  2){
1328
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1329
            }
1330
        }
1331
        //until then pix_fmt may be changed right after codec init
1332
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1333
            if( avctx->idct_algo == FF_IDCT_AUTO )
1334
                avctx->idct_algo = FF_IDCT_SIMPLE;
1335

    
1336
        //quantization matrixes may need reordering
1337
        //if dct permutation is changed
1338
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1339

    
1340
        if (MPV_common_init(s) < 0)
1341
            return -2;
1342

    
1343
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1344
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1345
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1346
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1347

    
1348
        s1->mpeg_enc_ctx_allocated = 1;
1349
    }
1350
    return 0;
1351
}
1352

    
1353
static int mpeg1_decode_picture(AVCodecContext *avctx,
1354
                                const uint8_t *buf, int buf_size)
1355
{
1356
    Mpeg1Context *s1 = avctx->priv_data;
1357
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1358
    int ref, f_code, vbv_delay;
1359

    
1360
    if(mpeg_decode_postinit(s->avctx) < 0)
1361
       return -2;
1362

    
1363
    init_get_bits(&s->gb, buf, buf_size*8);
1364

    
1365
    ref = get_bits(&s->gb, 10); /* temporal ref */
1366
    s->pict_type = get_bits(&s->gb, 3);
1367
    if(s->pict_type == 0 || s->pict_type > 3)
1368
        return -1;
1369

    
1370
    vbv_delay= get_bits(&s->gb, 16);
1371
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1372
        s->full_pel[0] = get_bits1(&s->gb);
1373
        f_code = get_bits(&s->gb, 3);
1374
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1375
            return -1;
1376
        s->mpeg_f_code[0][0] = f_code;
1377
        s->mpeg_f_code[0][1] = f_code;
1378
    }
1379
    if (s->pict_type == FF_B_TYPE) {
1380
        s->full_pel[1] = get_bits1(&s->gb);
1381
        f_code = get_bits(&s->gb, 3);
1382
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1383
            return -1;
1384
        s->mpeg_f_code[1][0] = f_code;
1385
        s->mpeg_f_code[1][1] = f_code;
1386
    }
1387
    s->current_picture.pict_type= s->pict_type;
1388
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1389

    
1390
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1391
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1392

    
1393
    s->y_dc_scale = 8;
1394
    s->c_dc_scale = 8;
1395
    s->first_slice = 1;
1396
    return 0;
1397
}
1398

    
1399
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1400
{
1401
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1402
    int horiz_size_ext, vert_size_ext;
1403
    int bit_rate_ext;
1404

    
1405
    skip_bits(&s->gb, 1); /* profil and level esc*/
1406
    s->avctx->profile= get_bits(&s->gb, 3);
1407
    s->avctx->level= get_bits(&s->gb, 4);
1408
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1409
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1410
    horiz_size_ext = get_bits(&s->gb, 2);
1411
    vert_size_ext = get_bits(&s->gb, 2);
1412
    s->width |= (horiz_size_ext << 12);
1413
    s->height |= (vert_size_ext << 12);
1414
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1415
    s->bit_rate += (bit_rate_ext << 18) * 400;
1416
    skip_bits1(&s->gb); /* marker */
1417
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1418

    
1419
    s->low_delay = get_bits1(&s->gb);
1420
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1421

    
1422
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1423
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1424

    
1425
    dprintf(s->avctx, "sequence extension\n");
1426
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1427
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1428

    
1429
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1430
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1431
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1432

    
1433
}
1434

    
1435
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1436
{
1437
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1438
    int color_description, w, h;
1439

    
1440
    skip_bits(&s->gb, 3); /* video format */
1441
    color_description= get_bits1(&s->gb);
1442
    if(color_description){
1443
        skip_bits(&s->gb, 8); /* color primaries */
1444
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1445
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1446
    }
1447
    w= get_bits(&s->gb, 14);
1448
    skip_bits(&s->gb, 1); //marker
1449
    h= get_bits(&s->gb, 14);
1450
    skip_bits(&s->gb, 1); //marker
1451

    
1452
    s1->pan_scan.width= 16*w;
1453
    s1->pan_scan.height=16*h;
1454

    
1455
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1456
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1457
}
1458

    
1459
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1460
{
1461
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1462
    int i,nofco;
1463

    
1464
    nofco = 1;
1465
    if(s->progressive_sequence){
1466
        if(s->repeat_first_field){
1467
            nofco++;
1468
            if(s->top_field_first)
1469
                nofco++;
1470
        }
1471
    }else{
1472
        if(s->picture_structure == PICT_FRAME){
1473
            nofco++;
1474
            if(s->repeat_first_field)
1475
                nofco++;
1476
        }
1477
    }
1478
    for(i=0; i<nofco; i++){
1479
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1480
        skip_bits(&s->gb, 1); //marker
1481
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1482
        skip_bits(&s->gb, 1); //marker
1483
    }
1484

    
1485
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1486
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1487
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1488
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1489
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1490
        );
1491
}
1492

    
1493
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1494
{
1495
    int i, v, j;
1496

    
1497
    dprintf(s->avctx, "matrix extension\n");
1498

    
1499
    if (get_bits1(&s->gb)) {
1500
        for(i=0;i<64;i++) {
1501
            v = get_bits(&s->gb, 8);
1502
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1503
            s->intra_matrix[j] = v;
1504
            s->chroma_intra_matrix[j] = v;
1505
        }
1506
    }
1507
    if (get_bits1(&s->gb)) {
1508
        for(i=0;i<64;i++) {
1509
            v = get_bits(&s->gb, 8);
1510
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1511
            s->inter_matrix[j] = v;
1512
            s->chroma_inter_matrix[j] = v;
1513
        }
1514
    }
1515
    if (get_bits1(&s->gb)) {
1516
        for(i=0;i<64;i++) {
1517
            v = get_bits(&s->gb, 8);
1518
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1519
            s->chroma_intra_matrix[j] = v;
1520
        }
1521
    }
1522
    if (get_bits1(&s->gb)) {
1523
        for(i=0;i<64;i++) {
1524
            v = get_bits(&s->gb, 8);
1525
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1526
            s->chroma_inter_matrix[j] = v;
1527
        }
1528
    }
1529
}
1530

    
1531
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1532
{
1533
    s->full_pel[0] = s->full_pel[1] = 0;
1534
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1535
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1536
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1537
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1538
    s->intra_dc_precision = get_bits(&s->gb, 2);
1539
    s->picture_structure = get_bits(&s->gb, 2);
1540
    s->top_field_first = get_bits1(&s->gb);
1541
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1542
    s->concealment_motion_vectors = get_bits1(&s->gb);
1543
    s->q_scale_type = get_bits1(&s->gb);
1544
    s->intra_vlc_format = get_bits1(&s->gb);
1545
    s->alternate_scan = get_bits1(&s->gb);
1546
    s->repeat_first_field = get_bits1(&s->gb);
1547
    s->chroma_420_type = get_bits1(&s->gb);
1548
    s->progressive_frame = get_bits1(&s->gb);
1549

    
1550
    if(s->picture_structure == PICT_FRAME){
1551
        s->first_field=0;
1552
        s->v_edge_pos= 16*s->mb_height;
1553
    }else{
1554
        s->first_field ^= 1;
1555
        s->v_edge_pos=  8*s->mb_height;
1556
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1557
    }
1558

    
1559
    if(s->alternate_scan){
1560
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1561
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1562
    }else{
1563
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1564
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1565
    }
1566

    
1567
    /* composite display not parsed */
1568
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1569
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1570
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1571
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1572
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1573
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1574
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1575
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1576
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1577
}
1578

    
1579
static void mpeg_decode_extension(AVCodecContext *avctx,
1580
                                  const uint8_t *buf, int buf_size)
1581
{
1582
    Mpeg1Context *s1 = avctx->priv_data;
1583
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1584
    int ext_type;
1585

    
1586
    init_get_bits(&s->gb, buf, buf_size*8);
1587

    
1588
    ext_type = get_bits(&s->gb, 4);
1589
    switch(ext_type) {
1590
    case 0x1:
1591
        mpeg_decode_sequence_extension(s1);
1592
        break;
1593
    case 0x2:
1594
        mpeg_decode_sequence_display_extension(s1);
1595
        break;
1596
    case 0x3:
1597
        mpeg_decode_quant_matrix_extension(s);
1598
        break;
1599
    case 0x7:
1600
        mpeg_decode_picture_display_extension(s1);
1601
        break;
1602
    case 0x8:
1603
        mpeg_decode_picture_coding_extension(s);
1604
        break;
1605
    }
1606
}
1607

    
1608
static void exchange_uv(MpegEncContext *s){
1609
    short * tmp = s->pblocks[4];
1610
    s->pblocks[4] = s->pblocks[5];
1611
    s->pblocks[5] = tmp;
1612
}
1613

    
1614
static int mpeg_field_start(MpegEncContext *s){
1615
    AVCodecContext *avctx= s->avctx;
1616
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1617

    
1618
    /* start frame decoding */
1619
    if(s->first_field || s->picture_structure==PICT_FRAME){
1620
        if(MPV_frame_start(s, avctx) < 0)
1621
            return -1;
1622

    
1623
        ff_er_frame_start(s);
1624

    
1625
        /* first check if we must repeat the frame */
1626
        s->current_picture_ptr->repeat_pict = 0;
1627
        if (s->repeat_first_field) {
1628
            if (s->progressive_sequence) {
1629
                if (s->top_field_first)
1630
                    s->current_picture_ptr->repeat_pict = 4;
1631
                else
1632
                    s->current_picture_ptr->repeat_pict = 2;
1633
            } else if (s->progressive_frame) {
1634
                s->current_picture_ptr->repeat_pict = 1;
1635
            }
1636
        }
1637

    
1638
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1639
    }else{ //second field
1640
            int i;
1641

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

    
1647
            for(i=0; i<4; i++){
1648
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1649
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1650
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1651
                }
1652
            }
1653
    }
1654
#ifdef HAVE_XVMC
1655
// MPV_frame_start will call this function too,
1656
// but we need to call it on every field
1657
    if(s->avctx->xvmc_acceleration)
1658
         XVMC_field_start(s,avctx);
1659
#endif
1660

    
1661
    return 0;
1662
}
1663

    
1664
#define DECODE_SLICE_ERROR -1
1665
#define DECODE_SLICE_OK 0
1666

    
1667
/**
1668
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1669
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1670
 *         DECODE_SLICE_OK if this slice is ok<br>
1671
 */
1672
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1673
                             const uint8_t **buf, int buf_size)
1674
{
1675
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1676
    AVCodecContext *avctx= s->avctx;
1677
    const int field_pic= s->picture_structure != PICT_FRAME;
1678
    const int lowres= s->avctx->lowres;
1679

    
1680
    s->resync_mb_x=
1681
    s->resync_mb_y= -1;
1682

    
1683
    if (mb_y<<field_pic >= s->mb_height){
1684
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1685
        return -1;
1686
    }
1687

    
1688
    init_get_bits(&s->gb, *buf, buf_size*8);
1689

    
1690
    ff_mpeg1_clean_buffers(s);
1691
    s->interlaced_dct = 0;
1692

    
1693
    s->qscale = get_qscale(s);
1694

    
1695
    if(s->qscale == 0){
1696
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1697
        return -1;
1698
    }
1699

    
1700
    /* extra slice info */
1701
    while (get_bits1(&s->gb) != 0) {
1702
        skip_bits(&s->gb, 8);
1703
    }
1704

    
1705
    s->mb_x=0;
1706

    
1707
    for(;;) {
1708
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1709
        if (code < 0){
1710
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1711
            return -1;
1712
        }
1713
        if (code >= 33) {
1714
            if (code == 33) {
1715
                s->mb_x += 33;
1716
            }
1717
            /* otherwise, stuffing, nothing to do */
1718
        } else {
1719
            s->mb_x += code;
1720
            break;
1721
        }
1722
    }
1723
    if(s->mb_x >= (unsigned)s->mb_width){
1724
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1725
        return -1;
1726
    }
1727

    
1728
    s->resync_mb_x= s->mb_x;
1729
    s->resync_mb_y= s->mb_y= mb_y;
1730
    s->mb_skip_run= 0;
1731
    ff_init_block_index(s);
1732

    
1733
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1734
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1735
             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",
1736
                 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],
1737
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1738
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1739
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1740
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1741
        }
1742
    }
1743

    
1744
    for(;;) {
1745
#ifdef HAVE_XVMC
1746
        //one 1 we memcpy blocks in xvmcvideo
1747
        if(s->avctx->xvmc_acceleration > 1)
1748
            XVMC_init_block(s);//set s->block
1749
#endif
1750

    
1751
        if(mpeg_decode_mb(s, s->block) < 0)
1752
            return -1;
1753

    
1754
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1755
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1756
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1757
            int motion_x, motion_y, dir, i;
1758
            if(field_pic && !s->first_field)
1759
                xy += wrap/2;
1760

    
1761
            for(i=0; i<2; i++){
1762
                for(dir=0; dir<2; dir++){
1763
                    if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1764
                        motion_x = motion_y = 0;
1765
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1766
                        motion_x = s->mv[dir][0][0];
1767
                        motion_y = s->mv[dir][0][1];
1768
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1769
                        motion_x = s->mv[dir][i][0];
1770
                        motion_y = s->mv[dir][i][1];
1771
                    }
1772

    
1773
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1774
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1775
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1776
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1777
                    s->current_picture.ref_index [dir][xy    ]=
1778
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1779
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1780
                }
1781
                xy += wrap;
1782
            }
1783
        }
1784

    
1785
        s->dest[0] += 16 >> lowres;
1786
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1787
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1788

    
1789
        MPV_decode_mb(s, s->block);
1790

    
1791
        if (++s->mb_x >= s->mb_width) {
1792
            const int mb_size= 16>>s->avctx->lowres;
1793

    
1794
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1795

    
1796
            s->mb_x = 0;
1797
            s->mb_y++;
1798

    
1799
            if(s->mb_y<<field_pic >= s->mb_height){
1800
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1801
                int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1802
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1803
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1804

    
1805
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1806
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1807
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1808
                    return -1;
1809
                }else
1810
                    goto eos;
1811
            }
1812

    
1813
            ff_init_block_index(s);
1814
        }
1815

    
1816
        /* skip mb handling */
1817
        if (s->mb_skip_run == -1) {
1818
            /* read again increment */
1819
            s->mb_skip_run = 0;
1820
            for(;;) {
1821
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1822
                if (code < 0){
1823
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1824
                    return -1;
1825
                }
1826
                if (code >= 33) {
1827
                    if (code == 33) {
1828
                        s->mb_skip_run += 33;
1829
                    }else if(code == 35){
1830
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1831
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1832
                            return -1;
1833
                        }
1834
                        goto eos; /* end of slice */
1835
                    }
1836
                    /* otherwise, stuffing, nothing to do */
1837
                } else {
1838
                    s->mb_skip_run += code;
1839
                    break;
1840
                }
1841
            }
1842
            if(s->mb_skip_run){
1843
                int i;
1844
                if(s->pict_type == FF_I_TYPE){
1845
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1846
                    return -1;
1847
                }
1848

    
1849
                /* skip mb */
1850
                s->mb_intra = 0;
1851
                for(i=0;i<12;i++)
1852
                    s->block_last_index[i] = -1;
1853
                if(s->picture_structure == PICT_FRAME)
1854
                    s->mv_type = MV_TYPE_16X16;
1855
                else
1856
                    s->mv_type = MV_TYPE_FIELD;
1857
                if (s->pict_type == FF_P_TYPE) {
1858
                    /* if P type, zero motion vector is implied */
1859
                    s->mv_dir = MV_DIR_FORWARD;
1860
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1861
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1862
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1863
                    s->field_select[0][0]= s->picture_structure - 1;
1864
                } else {
1865
                    /* if B type, reuse previous vectors and directions */
1866
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1867
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1868
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1869
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1870
                }
1871
            }
1872
        }
1873
    }
1874
eos: // end of slice
1875
    *buf += (get_bits_count(&s->gb)-1)/8;
1876
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1877
    return 0;
1878
}
1879

    
1880
static int slice_decode_thread(AVCodecContext *c, void *arg){
1881
    MpegEncContext *s= arg;
1882
    const uint8_t *buf= s->gb.buffer;
1883
    int mb_y= s->start_mb_y;
1884

    
1885
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1886

    
1887
    for(;;){
1888
        uint32_t start_code;
1889
        int ret;
1890

    
1891
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1892
        emms_c();
1893
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1894
//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);
1895
        if(ret < 0){
1896
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1897
                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);
1898
        }else{
1899
            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);
1900
        }
1901

    
1902
        if(s->mb_y == s->end_mb_y)
1903
            return 0;
1904

    
1905
        start_code= -1;
1906
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1907
        mb_y= start_code - SLICE_MIN_START_CODE;
1908
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1909
            return -1;
1910
    }
1911

    
1912
    return 0; //not reached
1913
}
1914

    
1915
/**
1916
 * handles slice ends.
1917
 * @return 1 if it seems to be the last slice of
1918
 */
1919
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1920
{
1921
    Mpeg1Context *s1 = avctx->priv_data;
1922
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1923

    
1924
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1925
        return 0;
1926

    
1927
#ifdef HAVE_XVMC
1928
    if(s->avctx->xvmc_acceleration)
1929
        XVMC_field_end(s);
1930
#endif
1931
    /* end of slice reached */
1932
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1933
        /* end of image */
1934

    
1935
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1936

    
1937
        ff_er_frame_end(s);
1938

    
1939
        MPV_frame_end(s);
1940

    
1941
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1942
            *pict= *(AVFrame*)s->current_picture_ptr;
1943
            ff_print_debug_info(s, pict);
1944
        } else {
1945
            s->picture_number++;
1946
            /* latency of 1 frame for I and P frames */
1947
            /* XXX: use another variable than picture_number */
1948
            if (s->last_picture_ptr != NULL) {
1949
                *pict= *(AVFrame*)s->last_picture_ptr;
1950
                 ff_print_debug_info(s, pict);
1951
            }
1952
        }
1953

    
1954
        return 1;
1955
    } else {
1956
        return 0;
1957
    }
1958
}
1959

    
1960
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1961
                                 const uint8_t *buf, int buf_size)
1962
{
1963
    Mpeg1Context *s1 = avctx->priv_data;
1964
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1965
    int width,height;
1966
    int i, v, j;
1967

    
1968
    init_get_bits(&s->gb, buf, buf_size*8);
1969

    
1970
    width = get_bits(&s->gb, 12);
1971
    height = get_bits(&s->gb, 12);
1972
    if (width <= 0 || height <= 0)
1973
        return -1;
1974
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1975
    if (s->aspect_ratio_info == 0) {
1976
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1977
        if (avctx->error_resilience >= FF_ER_COMPLIANT)
1978
            return -1;
1979
    }
1980
    s->frame_rate_index = get_bits(&s->gb, 4);
1981
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1982
        return -1;
1983
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1984
    if (get_bits1(&s->gb) == 0) /* marker */
1985
        return -1;
1986
    s->width = width;
1987
    s->height = height;
1988

    
1989
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1990
    skip_bits(&s->gb, 1);
1991

    
1992
    /* get matrix */
1993
    if (get_bits1(&s->gb)) {
1994
        for(i=0;i<64;i++) {
1995
            v = get_bits(&s->gb, 8);
1996
            if(v==0){
1997
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1998
                return -1;
1999
            }
2000
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2001
            s->intra_matrix[j] = v;
2002
            s->chroma_intra_matrix[j] = v;
2003
        }
2004
#ifdef DEBUG
2005
        dprintf(s->avctx, "intra matrix present\n");
2006
        for(i=0;i<64;i++)
2007
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2008
        dprintf(s->avctx, "\n");
2009
#endif
2010
    } else {
2011
        for(i=0;i<64;i++) {
2012
            j = s->dsp.idct_permutation[i];
2013
            v = ff_mpeg1_default_intra_matrix[i];
2014
            s->intra_matrix[j] = v;
2015
            s->chroma_intra_matrix[j] = v;
2016
        }
2017
    }
2018
    if (get_bits1(&s->gb)) {
2019
        for(i=0;i<64;i++) {
2020
            v = get_bits(&s->gb, 8);
2021
            if(v==0){
2022
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2023
                return -1;
2024
            }
2025
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2026
            s->inter_matrix[j] = v;
2027
            s->chroma_inter_matrix[j] = v;
2028
        }
2029
#ifdef DEBUG
2030
        dprintf(s->avctx, "non intra matrix present\n");
2031
        for(i=0;i<64;i++)
2032
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2033
        dprintf(s->avctx, "\n");
2034
#endif
2035
    } else {
2036
        for(i=0;i<64;i++) {
2037
            int j= s->dsp.idct_permutation[i];
2038
            v = ff_mpeg1_default_non_intra_matrix[i];
2039
            s->inter_matrix[j] = v;
2040
            s->chroma_inter_matrix[j] = v;
2041
        }
2042
    }
2043

    
2044
    if(show_bits(&s->gb, 23) != 0){
2045
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2046
        return -1;
2047
    }
2048

    
2049
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2050
    s->progressive_sequence = 1;
2051
    s->progressive_frame = 1;
2052
    s->picture_structure = PICT_FRAME;
2053
    s->frame_pred_frame_dct = 1;
2054
    s->chroma_format = 1;
2055
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2056
    avctx->sub_id = 1; /* indicates mpeg1 */
2057
    s->out_format = FMT_MPEG1;
2058
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2059
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2060

    
2061
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2062
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2063
               s->avctx->rc_buffer_size, s->bit_rate);
2064

    
2065
    return 0;
2066
}
2067

    
2068
static int vcr2_init_sequence(AVCodecContext *avctx)
2069
{
2070
    Mpeg1Context *s1 = avctx->priv_data;
2071
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2072
    int i, v;
2073

    
2074
    /* start new mpeg1 context decoding */
2075
    s->out_format = FMT_MPEG1;
2076
    if (s1->mpeg_enc_ctx_allocated) {
2077
        MPV_common_end(s);
2078
    }
2079
    s->width  = avctx->coded_width;
2080
    s->height = avctx->coded_height;
2081
    avctx->has_b_frames= 0; //true?
2082
    s->low_delay= 1;
2083

    
2084
    if(avctx->xvmc_acceleration){
2085
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2086
    }else{
2087
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2088
    }
2089

    
2090
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2091
        if( avctx->idct_algo == FF_IDCT_AUTO )
2092
            avctx->idct_algo = FF_IDCT_SIMPLE;
2093

    
2094
    if (MPV_common_init(s) < 0)
2095
        return -1;
2096
    exchange_uv(s);//common init reset pblocks, so we swap them here
2097
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2098
    s1->mpeg_enc_ctx_allocated = 1;
2099

    
2100
    for(i=0;i<64;i++) {
2101
        int j= s->dsp.idct_permutation[i];
2102
        v = ff_mpeg1_default_intra_matrix[i];
2103
        s->intra_matrix[j] = v;
2104
        s->chroma_intra_matrix[j] = v;
2105

    
2106
        v = ff_mpeg1_default_non_intra_matrix[i];
2107
        s->inter_matrix[j] = v;
2108
        s->chroma_inter_matrix[j] = v;
2109
    }
2110

    
2111
    s->progressive_sequence = 1;
2112
    s->progressive_frame = 1;
2113
    s->picture_structure = PICT_FRAME;
2114
    s->frame_pred_frame_dct = 1;
2115
    s->chroma_format = 1;
2116
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2117
    avctx->sub_id = 2; /* indicates mpeg2 */
2118
    return 0;
2119
}
2120

    
2121

    
2122
static void mpeg_decode_user_data(AVCodecContext *avctx,
2123
                                  const uint8_t *buf, int buf_size)
2124
{
2125
    const uint8_t *p;
2126
    int len, flags;
2127
    p = buf;
2128
    len = buf_size;
2129

    
2130
    /* we parse the DTG active format information */
2131
    if (len >= 5 &&
2132
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2133
        flags = p[4];
2134
        p += 5;
2135
        len -= 5;
2136
        if (flags & 0x80) {
2137
            /* skip event id */
2138
            if (len < 2)
2139
                return;
2140
            p += 2;
2141
            len -= 2;
2142
        }
2143
        if (flags & 0x40) {
2144
            if (len < 1)
2145
                return;
2146
            avctx->dtg_active_format = p[0] & 0x0f;
2147
        }
2148
    }
2149
}
2150

    
2151
static void mpeg_decode_gop(AVCodecContext *avctx,
2152
                            const uint8_t *buf, int buf_size){
2153
    Mpeg1Context *s1 = avctx->priv_data;
2154
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2155

    
2156
    int drop_frame_flag;
2157
    int time_code_hours, time_code_minutes;
2158
    int time_code_seconds, time_code_pictures;
2159
    int closed_gop, broken_link;
2160

    
2161
    init_get_bits(&s->gb, buf, buf_size*8);
2162

    
2163
    drop_frame_flag = get_bits1(&s->gb);
2164

    
2165
    time_code_hours=get_bits(&s->gb,5);
2166
    time_code_minutes = get_bits(&s->gb,6);
2167
    skip_bits1(&s->gb);//marker bit
2168
    time_code_seconds = get_bits(&s->gb,6);
2169
    time_code_pictures = get_bits(&s->gb,6);
2170

    
2171
    closed_gop  = get_bits1(&s->gb);
2172
    /*broken_link indicate that after editing the
2173
      reference frames of the first B-Frames after GOP I-Frame
2174
      are missing (open gop)*/
2175
    broken_link = get_bits1(&s->gb);
2176

    
2177
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2178
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2179
            time_code_hours, time_code_minutes, time_code_seconds,
2180
            time_code_pictures, closed_gop, broken_link);
2181
}
2182
/**
2183
 * finds the end of the current frame in the bitstream.
2184
 * @return the position of the first byte of the next frame, or -1
2185
 */
2186
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2187
{
2188
    int i;
2189
    uint32_t state= pc->state;
2190

    
2191
    /* EOF considered as end of frame */
2192
    if (buf_size == 0)
2193
        return 0;
2194

    
2195
/*
2196
 0  frame start         -> 1/4
2197
 1  first_SEQEXT        -> 0/2
2198
 2  first field start   -> 3/0
2199
 3  second_SEQEXT       -> 2/0
2200
 4  searching end
2201
*/
2202

    
2203
    for(i=0; i<buf_size; i++){
2204
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2205
        if(pc->frame_start_found&1){
2206
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2207
                pc->frame_start_found--;
2208
            else if(state == EXT_START_CODE+2){
2209
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2210
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2211
            }
2212
            state++;
2213
        }else{
2214
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2215
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2216
                i++;
2217
                pc->frame_start_found=4;
2218
            }
2219
            if(state == SEQ_END_CODE){
2220
                pc->state=-1;
2221
                return i+1;
2222
            }
2223
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2224
                pc->frame_start_found= 0;
2225
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2226
                pc->frame_start_found++;
2227
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2228
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2229
                    pc->frame_start_found=0;
2230
                    pc->state=-1;
2231
                    return i-3;
2232
                }
2233
            }
2234
        }
2235
    }
2236
    pc->state= state;
2237
    return END_NOT_FOUND;
2238
}
2239

    
2240
static int decode_chunks(AVCodecContext *avctx,
2241
                             AVFrame *picture, int *data_size,
2242
                             const uint8_t *buf, int buf_size);
2243

    
2244
/* handle buffering and image synchronisation */
2245
static int mpeg_decode_frame(AVCodecContext *avctx,
2246
                             void *data, int *data_size,
2247
                             const uint8_t *buf, int buf_size)
2248
{
2249
    Mpeg1Context *s = avctx->priv_data;
2250
    AVFrame *picture = data;
2251
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2252
    dprintf(avctx, "fill_buffer\n");
2253

    
2254
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2255
        /* special case for last picture */
2256
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2257
            *picture= *(AVFrame*)s2->next_picture_ptr;
2258
            s2->next_picture_ptr= NULL;
2259

    
2260
            *data_size = sizeof(AVFrame);
2261
        }
2262
        return buf_size;
2263
    }
2264

    
2265
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2266
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2267

    
2268
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2269
            return buf_size;
2270
    }
2271

    
2272
#if 0
2273
    if (s->repeat_field % 2 == 1) {
2274
        s->repeat_field++;
2275
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2276
        //        s2->picture_number, s->repeat_field);
2277
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2278
            *data_size = sizeof(AVPicture);
2279
            goto the_end;
2280
        }
2281
    }
2282
#endif
2283

    
2284
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2285
        vcr2_init_sequence(avctx);
2286

    
2287
    s->slice_count= 0;
2288

    
2289
    if(avctx->extradata && !avctx->frame_number)
2290
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2291

    
2292
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2293
}
2294

    
2295
static int decode_chunks(AVCodecContext *avctx,
2296
                             AVFrame *picture, int *data_size,
2297
                             const uint8_t *buf, int buf_size)
2298
{
2299
    Mpeg1Context *s = avctx->priv_data;
2300
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2301
    const uint8_t *buf_ptr = buf;
2302
    const uint8_t *buf_end = buf + buf_size;
2303
    int ret, input_size;
2304

    
2305
    for(;;) {
2306
        /* find start next code */
2307
        uint32_t start_code = -1;
2308
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2309
        if (start_code > 0x1ff){
2310
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2311
                if(avctx->thread_count > 1){
2312
                    int i;
2313

    
2314
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2315
                    for(i=0; i<s->slice_count; i++)
2316
                        s2->error_count += s2->thread_context[i]->error_count;
2317
                }
2318
                if (slice_end(avctx, picture)) {
2319
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2320
                        *data_size = sizeof(AVPicture);
2321
                }
2322
            }
2323
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2324
        }
2325

    
2326
        input_size = buf_end - buf_ptr;
2327

    
2328
        if(avctx->debug & FF_DEBUG_STARTCODE){
2329
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2330
        }
2331

    
2332
        /* prepare data for next start code */
2333
        switch(start_code) {
2334
        case SEQ_START_CODE:
2335
            mpeg1_decode_sequence(avctx, buf_ptr,
2336
                                    input_size);
2337
            break;
2338

    
2339
        case PICTURE_START_CODE:
2340
            /* we have a complete image : we try to decompress it */
2341
            mpeg1_decode_picture(avctx,
2342
                                    buf_ptr, input_size);
2343
            break;
2344
        case EXT_START_CODE:
2345
            mpeg_decode_extension(avctx,
2346
                                    buf_ptr, input_size);
2347
            break;
2348
        case USER_START_CODE:
2349
            mpeg_decode_user_data(avctx,
2350
                                    buf_ptr, input_size);
2351
            break;
2352
        case GOP_START_CODE:
2353
            s2->first_field=0;
2354
            mpeg_decode_gop(avctx,
2355
                                    buf_ptr, input_size);
2356
            break;
2357
        default:
2358
            if (start_code >= SLICE_MIN_START_CODE &&
2359
                start_code <= SLICE_MAX_START_CODE) {
2360
                int mb_y= start_code - SLICE_MIN_START_CODE;
2361

    
2362
                if(s2->last_picture_ptr==NULL){
2363
                /* Skip B-frames if we do not have reference frames. */
2364
                    if(s2->pict_type==FF_B_TYPE) break;
2365
                }
2366
                if(s2->next_picture_ptr==NULL){
2367
                /* Skip P-frames if we do not have reference frame no valid header. */
2368
                    if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2369
                }
2370
                /* Skip B-frames if we are in a hurry. */
2371
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2372
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2373
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2374
                    || avctx->skip_frame >= AVDISCARD_ALL)
2375
                    break;
2376
                /* Skip everything if we are in a hurry>=5. */
2377
                if(avctx->hurry_up>=5) break;
2378

    
2379
                if (!s->mpeg_enc_ctx_allocated) break;
2380

    
2381
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2382
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2383
                        break;
2384
                }
2385

    
2386
                if(s2->first_slice){
2387
                    s2->first_slice=0;
2388
                            if(mpeg_field_start(s2) < 0)
2389
                        return -1;
2390
                    }
2391
                if(!s2->current_picture_ptr){
2392
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2393
                    return -1;
2394
                }
2395

    
2396
                if(avctx->thread_count > 1){
2397
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2398
                    if(threshold <= mb_y){
2399
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2400

    
2401
                        thread_context->start_mb_y= mb_y;
2402
                        thread_context->end_mb_y  = s2->mb_height;
2403
                        if(s->slice_count){
2404
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2405
                            ff_update_duplicate_context(thread_context, s2);
2406
                        }
2407
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2408
                        s->slice_count++;
2409
                    }
2410
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
2411
                }else{
2412
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2413
                    emms_c();
2414

    
2415
                    if(ret < 0){
2416
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2417
                            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);
2418
                    }else{
2419
                        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);
2420
                    }
2421
                }
2422
            }
2423
            break;
2424
        }
2425
    }
2426
}
2427

    
2428
static int mpeg_decode_end(AVCodecContext *avctx)
2429
{
2430
    Mpeg1Context *s = avctx->priv_data;
2431

    
2432
    if (s->mpeg_enc_ctx_allocated)
2433
        MPV_common_end(&s->mpeg_enc_ctx);
2434
    return 0;
2435
}
2436

    
2437
AVCodec mpeg1video_decoder = {
2438
    "mpeg1video",
2439
    CODEC_TYPE_VIDEO,
2440
    CODEC_ID_MPEG1VIDEO,
2441
    sizeof(Mpeg1Context),
2442
    mpeg_decode_init,
2443
    NULL,
2444
    mpeg_decode_end,
2445
    mpeg_decode_frame,
2446
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2447
    .flush= ff_mpeg_flush,
2448
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2449
};
2450

    
2451
AVCodec mpeg2video_decoder = {
2452
    "mpeg2video",
2453
    CODEC_TYPE_VIDEO,
2454
    CODEC_ID_MPEG2VIDEO,
2455
    sizeof(Mpeg1Context),
2456
    mpeg_decode_init,
2457
    NULL,
2458
    mpeg_decode_end,
2459
    mpeg_decode_frame,
2460
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2461
    .flush= ff_mpeg_flush,
2462
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2463
};
2464

    
2465
//legacy decoder
2466
AVCodec mpegvideo_decoder = {
2467
    "mpegvideo",
2468
    CODEC_TYPE_VIDEO,
2469
    CODEC_ID_MPEG2VIDEO,
2470
    sizeof(Mpeg1Context),
2471
    mpeg_decode_init,
2472
    NULL,
2473
    mpeg_decode_end,
2474
    mpeg_decode_frame,
2475
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2476
    .flush= ff_mpeg_flush,
2477
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2478
};
2479

    
2480
#ifdef HAVE_XVMC
2481
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2482
    Mpeg1Context *s;
2483

    
2484
    if( avctx->thread_count > 1)
2485
        return -1;
2486
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2487
        return -1;
2488
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2489
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2490
    }
2491
    mpeg_decode_init(avctx);
2492
    s = avctx->priv_data;
2493

    
2494
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2495
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2496

    
2497
    return 0;
2498
}
2499

    
2500
AVCodec mpeg_xvmc_decoder = {
2501
    "mpegvideo_xvmc",
2502
    CODEC_TYPE_VIDEO,
2503
    CODEC_ID_MPEG2VIDEO_XVMC,
2504
    sizeof(Mpeg1Context),
2505
    mpeg_mc_decode_init,
2506
    NULL,
2507
    mpeg_decode_end,
2508
    mpeg_decode_frame,
2509
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2510
    .flush= ff_mpeg_flush,
2511
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),
2512
};
2513

    
2514
#endif
2515

    
2516
/* this is ugly i know, but the alternative is too make
2517
   hundreds of vars global and prefix them with ff_mpeg1_
2518
   which is far uglier. */
2519
#include "mdec.c"