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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"
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#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
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#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
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#define TEX_VLC_BITS 9
49

    
50
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,
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                                    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,-1};
74
static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
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static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
76
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
77
                                           PIX_FMT_XVMC_MPEG2_IDCT,
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                                           PIX_FMT_XVMC_MPEG2_MC,
79
                                           -1};
80

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

    
83
static void init_2d_vlc_rl(RLTable *rl, int use_static)
84
{
85
    int i;
86

    
87
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
88
             &rl->table_vlc[0][1], 4, 2,
89
             &rl->table_vlc[0][0], 4, 2, use_static);
90

    
91
    if(use_static)
92
        rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
93
    else
94
        rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
95

    
96
    for(i=0; i<rl->vlc.table_size; i++){
97
        int code= rl->vlc.table[i][0];
98
        int len = rl->vlc.table[i][1];
99
        int level, run;
100

    
101
        if(len==0){ // illegal code
102
            run= 65;
103
            level= MAX_LEVEL;
104
        }else if(len<0){ //more bits needed
105
            run= 0;
106
            level= code;
107
        }else{
108
            if(code==rl->n){ //esc
109
                run= 65;
110
                level= 0;
111
            }else if(code==rl->n+1){ //eob
112
                run= 0;
113
                level= 127;
114
            }else{
115
                run=   rl->table_run  [code] + 1;
116
                level= rl->table_level[code];
117
            }
118
        }
119
        rl->rl_vlc[0][i].len= len;
120
        rl->rl_vlc[0][i].level= level;
121
        rl->rl_vlc[0][i].run= run;
122
    }
123
}
124

    
125
void ff_mpeg12_common_init(MpegEncContext *s)
126
{
127

    
128
    s->y_dc_scale_table=
129
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
130

    
131
}
132

    
133
void ff_mpeg1_clean_buffers(MpegEncContext *s){
134
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
135
    s->last_dc[1] = s->last_dc[0];
136
    s->last_dc[2] = s->last_dc[0];
137
    memset(s->last_mv, 0, sizeof(s->last_mv));
138
}
139

    
140

    
141
/******************************************/
142
/* decoding */
143

    
144
static VLC dc_lum_vlc;
145
static VLC dc_chroma_vlc;
146
static VLC mv_vlc;
147
static VLC mbincr_vlc;
148
static VLC mb_ptype_vlc;
149
static VLC mb_btype_vlc;
150
static VLC mb_pat_vlc;
151

    
152
static void init_vlcs(void)
153
{
154
    static int done = 0;
155

    
156
    if (!done) {
157
        done = 1;
158

    
159
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
160
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
161
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 1);
162
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
163
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
164
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 1);
165
        init_vlc(&mv_vlc, MV_VLC_BITS, 17,
166
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
167
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 1);
168
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
169
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
170
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 1);
171
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
172
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
173
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 1);
174

    
175
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
176
                 &table_mb_ptype[0][1], 2, 1,
177
                 &table_mb_ptype[0][0], 2, 1, 1);
178
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
179
                 &table_mb_btype[0][1], 2, 1,
180
                 &table_mb_btype[0][0], 2, 1, 1);
181
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
182
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
183

    
184
        init_2d_vlc_rl(&ff_rl_mpeg1, 1);
185
        init_2d_vlc_rl(&ff_rl_mpeg2, 1);
186
    }
187
}
188

    
189
static inline int get_dmv(MpegEncContext *s)
190
{
191
    if(get_bits1(&s->gb))
192
        return 1 - (get_bits1(&s->gb) << 1);
193
    else
194
        return 0;
195
}
196

    
197
static inline int get_qscale(MpegEncContext *s)
198
{
199
    int qscale = get_bits(&s->gb, 5);
200
    if (s->q_scale_type) {
201
        return non_linear_qscale[qscale];
202
    } else {
203
        return qscale << 1;
204
    }
205
}
206

    
207
/* motion type (for mpeg2) */
208
#define MT_FIELD 1
209
#define MT_FRAME 2
210
#define MT_16X8  2
211
#define MT_DMV   3
212

    
213
static int mpeg_decode_mb(MpegEncContext *s,
214
                          DCTELEM block[12][64])
215
{
216
    int i, j, k, cbp, val, mb_type, motion_type;
217
    const int mb_block_count = 4 + (1<< s->chroma_format);
218

    
219
    dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
220

    
221
    assert(s->mb_skipped==0);
222

    
223
    if (s->mb_skip_run-- != 0) {
224
        if (s->pict_type == P_TYPE) {
225
            s->mb_skipped = 1;
226
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
227
        } else {
228
            int mb_type;
229

    
230
            if(s->mb_x)
231
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
232
            else
233
                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,
234
            if(IS_INTRA(mb_type))
235
                return -1;
236

    
237
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
238
                mb_type | MB_TYPE_SKIP;
239
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
240

    
241
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
242
                s->mb_skipped = 1;
243
        }
244

    
245
        return 0;
246
    }
247

    
248
    switch(s->pict_type) {
249
    default:
250
    case I_TYPE:
251
        if (get_bits1(&s->gb) == 0) {
252
            if (get_bits1(&s->gb) == 0){
253
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
254
                return -1;
255
            }
256
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
257
        } else {
258
            mb_type = MB_TYPE_INTRA;
259
        }
260
        break;
261
    case P_TYPE:
262
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
263
        if (mb_type < 0){
264
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
265
            return -1;
266
        }
267
        mb_type = ptype2mb_type[ mb_type ];
268
        break;
269
    case B_TYPE:
270
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
271
        if (mb_type < 0){
272
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
273
            return -1;
274
        }
275
        mb_type = btype2mb_type[ mb_type ];
276
        break;
277
    }
278
    dprintf(s->avctx, "mb_type=%x\n", mb_type);
279
//    motion_type = 0; /* avoid warning */
280
    if (IS_INTRA(mb_type)) {
281
        s->dsp.clear_blocks(s->block[0]);
282

    
283
        if(!s->chroma_y_shift){
284
            s->dsp.clear_blocks(s->block[6]);
285
        }
286

    
287
        /* compute dct type */
288
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
289
            !s->frame_pred_frame_dct) {
290
            s->interlaced_dct = get_bits1(&s->gb);
291
        }
292

    
293
        if (IS_QUANT(mb_type))
294
            s->qscale = get_qscale(s);
295

    
296
        if (s->concealment_motion_vectors) {
297
            /* just parse them */
298
            if (s->picture_structure != PICT_FRAME)
299
                skip_bits1(&s->gb); /* field select */
300

    
301
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
302
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
303
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
304
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
305

    
306
            skip_bits1(&s->gb); /* marker */
307
        }else
308
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
309
        s->mb_intra = 1;
310
#ifdef HAVE_XVMC
311
        //one 1 we memcpy blocks in xvmcvideo
312
        if(s->avctx->xvmc_acceleration > 1){
313
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
314
            if(s->swap_uv){
315
                exchange_uv(s);
316
            }
317
        }
318
#endif
319

    
320
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
321
            if(s->flags2 & CODEC_FLAG2_FAST){
322
                for(i=0;i<6;i++) {
323
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
324
                }
325
            }else{
326
                for(i=0;i<mb_block_count;i++) {
327
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
328
                        return -1;
329
                }
330
            }
331
        } else {
332
            for(i=0;i<6;i++) {
333
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
334
                    return -1;
335
            }
336
        }
337
    } else {
338
        if (mb_type & MB_TYPE_ZERO_MV){
339
            assert(mb_type & MB_TYPE_CBP);
340

    
341
            s->mv_dir = MV_DIR_FORWARD;
342
            if(s->picture_structure == PICT_FRAME){
343
                if(!s->frame_pred_frame_dct)
344
                    s->interlaced_dct = get_bits1(&s->gb);
345
                s->mv_type = MV_TYPE_16X16;
346
            }else{
347
                s->mv_type = MV_TYPE_FIELD;
348
                mb_type |= MB_TYPE_INTERLACED;
349
                s->field_select[0][0]= s->picture_structure - 1;
350
            }
351

    
352
            if (IS_QUANT(mb_type))
353
                s->qscale = get_qscale(s);
354

    
355
            s->last_mv[0][0][0] = 0;
356
            s->last_mv[0][0][1] = 0;
357
            s->last_mv[0][1][0] = 0;
358
            s->last_mv[0][1][1] = 0;
359
            s->mv[0][0][0] = 0;
360
            s->mv[0][0][1] = 0;
361
        }else{
362
            assert(mb_type & MB_TYPE_L0L1);
363
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
364
            /* get additional motion vector type */
365
            if (s->frame_pred_frame_dct)
366
                motion_type = MT_FRAME;
367
            else{
368
                motion_type = get_bits(&s->gb, 2);
369
            }
370

    
371
            /* compute dct type */
372
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
373
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
374
                s->interlaced_dct = get_bits1(&s->gb);
375
            }
376

    
377
            if (IS_QUANT(mb_type))
378
                s->qscale = get_qscale(s);
379

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

    
449
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
450
                                                    s->last_mv[i][0][0]);
451
                            s->last_mv[i][0][0] = mx;
452
                            s->last_mv[i][1][0] = mx;
453
                            dmx = get_dmv(s);
454
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
455
                                                    s->last_mv[i][0][1] >> 1);
456
                            dmy = get_dmv(s);
457
                            s->mv_type = MV_TYPE_DMV;
458

    
459

    
460
                            s->last_mv[i][0][1] = my<<1;
461
                            s->last_mv[i][1][1] = my<<1;
462

    
463
                            s->mv[i][0][0] = mx;
464
                            s->mv[i][0][1] = my;
465
                            s->mv[i][1][0] = mx;//not used
466
                            s->mv[i][1][1] = my;//not used
467

    
468
                            if (s->picture_structure == PICT_FRAME) {
469
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
470

    
471
                                //m = 1 + 2 * s->top_field_first;
472
                                m = s->top_field_first ? 1 : 3;
473

    
474
                                /* top -> top pred */
475
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
476
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
477
                                m = 4 - m;
478
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
479
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
480
                            } else {
481
                                mb_type |= MB_TYPE_16x16;
482

    
483
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
484
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
485
                                if(s->picture_structure == PICT_TOP_FIELD)
486
                                    s->mv[i][2][1]--;
487
                                else
488
                                    s->mv[i][2][1]++;
489
                            }
490
                        }
491
                        break;
492
                    default:
493
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
494
                        return -1;
495
                    }
496
                }
497
            }
498
        }
499

    
500
        s->mb_intra = 0;
501
        if (HAS_CBP(mb_type)) {
502
            s->dsp.clear_blocks(s->block[0]);
503

    
504
            if(!s->chroma_y_shift){
505
                s->dsp.clear_blocks(s->block[6]);
506
            }
507

    
508
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
509
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
510
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
511
                return -1;
512
            }
513
            if(mb_block_count > 6){
514
                 cbp<<= mb_block_count-6;
515
                 cbp |= get_bits(&s->gb, mb_block_count-6);
516
            }
517

    
518
#ifdef HAVE_XVMC
519
            //on 1 we memcpy blocks in xvmcvideo
520
            if(s->avctx->xvmc_acceleration > 1){
521
                XVMC_pack_pblocks(s,cbp);
522
                if(s->swap_uv){
523
                    exchange_uv(s);
524
                }
525
            }
526
#endif
527

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

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

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

    
581
    return 0;
582
}
583

    
584
/* as h263, but only 17 codes */
585
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
586
{
587
    int code, sign, val, l, shift;
588

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

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

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

    
615
static inline int decode_dc(GetBitContext *gb, int component)
616
{
617
    int code, diff;
618

    
619
    if (component == 0) {
620
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
621
    } else {
622
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
623
    }
624
    if (code < 0){
625
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
626
        return 0xffff;
627
    }
628
    if (code == 0) {
629
        diff = 0;
630
    } else {
631
        diff = get_xbits(gb, code);
632
    }
633
    return diff;
634
}
635

    
636
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
637
                               DCTELEM *block,
638
                               int n)
639
{
640
    int level, dc, diff, i, j, run;
641
    int component;
642
    RLTable *rl = &ff_rl_mpeg1;
643
    uint8_t * const scantable= s->intra_scantable.permutated;
644
    const uint16_t *quant_matrix= s->intra_matrix;
645
    const int qscale= s->qscale;
646

    
647
    /* DC coef */
648
    component = (n <= 3 ? 0 : n - 4 + 1);
649
    diff = decode_dc(&s->gb, component);
650
    if (diff >= 0xffff)
651
        return -1;
652
    dc = s->last_dc[component];
653
    dc += diff;
654
    s->last_dc[component] = dc;
655
    block[0] = dc<<3;
656
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
657
    i = 0;
658
    {
659
        OPEN_READER(re, &s->gb);
660
        /* now quantify & encode AC coefs */
661
        for(;;) {
662
            UPDATE_CACHE(re, &s->gb);
663
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
664

    
665
            if(level == 127){
666
                break;
667
            } else if(level != 0) {
668
                i += run;
669
                j = scantable[i];
670
                level= (level*qscale*quant_matrix[j])>>4;
671
                level= (level-1)|1;
672
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
673
                LAST_SKIP_BITS(re, &s->gb, 1);
674
            } else {
675
                /* escape */
676
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
677
                UPDATE_CACHE(re, &s->gb);
678
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
679
                if (level == -128) {
680
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
681
                } else if (level == 0) {
682
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
683
                }
684
                i += run;
685
                j = scantable[i];
686
                if(level<0){
687
                    level= -level;
688
                    level= (level*qscale*quant_matrix[j])>>4;
689
                    level= (level-1)|1;
690
                    level= -level;
691
                }else{
692
                    level= (level*qscale*quant_matrix[j])>>4;
693
                    level= (level-1)|1;
694
                }
695
            }
696
            if (i > 63){
697
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
698
                return -1;
699
            }
700

    
701
            block[j] = level;
702
        }
703
        CLOSE_READER(re, &s->gb);
704
    }
705
    s->block_last_index[n] = i;
706
   return 0;
707
}
708

    
709
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
710
                               DCTELEM *block,
711
                               int n)
712
{
713
    int level, i, j, run;
714
    RLTable *rl = &ff_rl_mpeg1;
715
    uint8_t * const scantable= s->intra_scantable.permutated;
716
    const uint16_t *quant_matrix= s->inter_matrix;
717
    const int qscale= s->qscale;
718

    
719
    {
720
        OPEN_READER(re, &s->gb);
721
        i = -1;
722
        /* special case for the first coef. no need to add a second vlc table */
723
        UPDATE_CACHE(re, &s->gb);
724
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
725
            level= (3*qscale*quant_matrix[0])>>5;
726
            level= (level-1)|1;
727
            if(GET_CACHE(re, &s->gb)&0x40000000)
728
                level= -level;
729
            block[0] = level;
730
            i++;
731
            SKIP_BITS(re, &s->gb, 2);
732
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
733
                goto end;
734
        }
735

    
736
        /* now quantify & encode AC coefs */
737
        for(;;) {
738
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
739

    
740
            if(level != 0) {
741
                i += run;
742
                j = scantable[i];
743
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
744
                level= (level-1)|1;
745
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
746
                SKIP_BITS(re, &s->gb, 1);
747
            } else {
748
                /* escape */
749
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
750
                UPDATE_CACHE(re, &s->gb);
751
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
752
                if (level == -128) {
753
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
754
                } else if (level == 0) {
755
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
756
                }
757
                i += run;
758
                j = scantable[i];
759
                if(level<0){
760
                    level= -level;
761
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
762
                    level= (level-1)|1;
763
                    level= -level;
764
                }else{
765
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
766
                    level= (level-1)|1;
767
                }
768
            }
769
            if (i > 63){
770
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
771
                return -1;
772
            }
773

    
774
            block[j] = level;
775
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
776
                break;
777
            UPDATE_CACHE(re, &s->gb);
778
        }
779
end:
780
        LAST_SKIP_BITS(re, &s->gb, 2);
781
        CLOSE_READER(re, &s->gb);
782
    }
783
    s->block_last_index[n] = i;
784
    return 0;
785
}
786

    
787
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
788
{
789
    int level, i, j, run;
790
    RLTable *rl = &ff_rl_mpeg1;
791
    uint8_t * const scantable= s->intra_scantable.permutated;
792
    const int qscale= s->qscale;
793

    
794
    {
795
        OPEN_READER(re, &s->gb);
796
        i = -1;
797
        /* special case for the first coef. no need to add a second vlc table */
798
        UPDATE_CACHE(re, &s->gb);
799
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
800
            level= (3*qscale)>>1;
801
            level= (level-1)|1;
802
            if(GET_CACHE(re, &s->gb)&0x40000000)
803
                level= -level;
804
            block[0] = level;
805
            i++;
806
            SKIP_BITS(re, &s->gb, 2);
807
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
808
                goto end;
809
        }
810

    
811
        /* now quantify & encode AC coefs */
812
        for(;;) {
813
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
814

    
815
            if(level != 0) {
816
                i += run;
817
                j = scantable[i];
818
                level= ((level*2+1)*qscale)>>1;
819
                level= (level-1)|1;
820
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
821
                SKIP_BITS(re, &s->gb, 1);
822
            } else {
823
                /* escape */
824
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
825
                UPDATE_CACHE(re, &s->gb);
826
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
827
                if (level == -128) {
828
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
829
                } else if (level == 0) {
830
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
831
                }
832
                i += run;
833
                j = scantable[i];
834
                if(level<0){
835
                    level= -level;
836
                    level= ((level*2+1)*qscale)>>1;
837
                    level= (level-1)|1;
838
                    level= -level;
839
                }else{
840
                    level= ((level*2+1)*qscale)>>1;
841
                    level= (level-1)|1;
842
                }
843
            }
844

    
845
            block[j] = level;
846
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
847
                break;
848
            UPDATE_CACHE(re, &s->gb);
849
        }
850
end:
851
        LAST_SKIP_BITS(re, &s->gb, 2);
852
        CLOSE_READER(re, &s->gb);
853
    }
854
    s->block_last_index[n] = i;
855
    return 0;
856
}
857

    
858

    
859
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
860
                               DCTELEM *block,
861
                               int n)
862
{
863
    int level, i, j, run;
864
    RLTable *rl = &ff_rl_mpeg1;
865
    uint8_t * const scantable= s->intra_scantable.permutated;
866
    const uint16_t *quant_matrix;
867
    const int qscale= s->qscale;
868
    int mismatch;
869

    
870
    mismatch = 1;
871

    
872
    {
873
        OPEN_READER(re, &s->gb);
874
        i = -1;
875
        if (n < 4)
876
            quant_matrix = s->inter_matrix;
877
        else
878
            quant_matrix = s->chroma_inter_matrix;
879

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

    
894
        /* now quantify & encode AC coefs */
895
        for(;;) {
896
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
897

    
898
            if(level != 0) {
899
                i += run;
900
                j = scantable[i];
901
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
902
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
903
                SKIP_BITS(re, &s->gb, 1);
904
            } else {
905
                /* escape */
906
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
907
                UPDATE_CACHE(re, &s->gb);
908
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
909

    
910
                i += run;
911
                j = scantable[i];
912
                if(level<0){
913
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
914
                    level= -level;
915
                }else{
916
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
917
                }
918
            }
919
            if (i > 63){
920
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
921
                return -1;
922
            }
923

    
924
            mismatch ^= level;
925
            block[j] = level;
926
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
927
                break;
928
            UPDATE_CACHE(re, &s->gb);
929
        }
930
end:
931
        LAST_SKIP_BITS(re, &s->gb, 2);
932
        CLOSE_READER(re, &s->gb);
933
    }
934
    block[63] ^= (mismatch & 1);
935

    
936
    s->block_last_index[n] = i;
937
    return 0;
938
}
939

    
940
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
941
                               DCTELEM *block,
942
                               int n)
943
{
944
    int level, i, j, run;
945
    RLTable *rl = &ff_rl_mpeg1;
946
    uint8_t * const scantable= s->intra_scantable.permutated;
947
    const int qscale= s->qscale;
948
    OPEN_READER(re, &s->gb);
949
    i = -1;
950

    
951
    /* special case for the first coef. no need to add a second vlc table */
952
    UPDATE_CACHE(re, &s->gb);
953
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
954
        level= (3*qscale)>>1;
955
        if(GET_CACHE(re, &s->gb)&0x40000000)
956
            level= -level;
957
        block[0] = level;
958
        i++;
959
        SKIP_BITS(re, &s->gb, 2);
960
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
961
            goto end;
962
    }
963

    
964
    /* now quantify & encode AC coefs */
965
    for(;;) {
966
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
967

    
968
        if(level != 0) {
969
            i += run;
970
            j = scantable[i];
971
            level= ((level*2+1)*qscale)>>1;
972
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
973
            SKIP_BITS(re, &s->gb, 1);
974
        } else {
975
            /* escape */
976
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
977
            UPDATE_CACHE(re, &s->gb);
978
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
979

    
980
            i += run;
981
            j = scantable[i];
982
            if(level<0){
983
                level= ((-level*2+1)*qscale)>>1;
984
                level= -level;
985
            }else{
986
                level= ((level*2+1)*qscale)>>1;
987
            }
988
        }
989

    
990
        block[j] = level;
991
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
992
            break;
993
        UPDATE_CACHE(re, &s->gb);
994
    }
995
end:
996
    LAST_SKIP_BITS(re, &s->gb, 2);
997
    CLOSE_READER(re, &s->gb);
998
    s->block_last_index[n] = i;
999
    return 0;
1000
}
1001

    
1002

    
1003
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1004
                               DCTELEM *block,
1005
                               int n)
1006
{
1007
    int level, dc, diff, i, j, run;
1008
    int component;
1009
    RLTable *rl;
1010
    uint8_t * const scantable= s->intra_scantable.permutated;
1011
    const uint16_t *quant_matrix;
1012
    const int qscale= s->qscale;
1013
    int mismatch;
1014

    
1015
    /* DC coef */
1016
    if (n < 4){
1017
        quant_matrix = s->intra_matrix;
1018
        component = 0;
1019
    }else{
1020
        quant_matrix = s->chroma_intra_matrix;
1021
        component = (n&1) + 1;
1022
    }
1023
    diff = decode_dc(&s->gb, component);
1024
    if (diff >= 0xffff)
1025
        return -1;
1026
    dc = s->last_dc[component];
1027
    dc += diff;
1028
    s->last_dc[component] = dc;
1029
    block[0] = dc << (3 - s->intra_dc_precision);
1030
    dprintf(s->avctx, "dc=%d\n", block[0]);
1031
    mismatch = block[0] ^ 1;
1032
    i = 0;
1033
    if (s->intra_vlc_format)
1034
        rl = &ff_rl_mpeg2;
1035
    else
1036
        rl = &ff_rl_mpeg1;
1037

    
1038
    {
1039
        OPEN_READER(re, &s->gb);
1040
        /* now quantify & encode AC coefs */
1041
        for(;;) {
1042
            UPDATE_CACHE(re, &s->gb);
1043
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1044

    
1045
            if(level == 127){
1046
                break;
1047
            } else if(level != 0) {
1048
                i += run;
1049
                j = scantable[i];
1050
                level= (level*qscale*quant_matrix[j])>>4;
1051
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1052
                LAST_SKIP_BITS(re, &s->gb, 1);
1053
            } else {
1054
                /* escape */
1055
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1056
                UPDATE_CACHE(re, &s->gb);
1057
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1058
                i += run;
1059
                j = scantable[i];
1060
                if(level<0){
1061
                    level= (-level*qscale*quant_matrix[j])>>4;
1062
                    level= -level;
1063
                }else{
1064
                    level= (level*qscale*quant_matrix[j])>>4;
1065
                }
1066
            }
1067
            if (i > 63){
1068
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1069
                return -1;
1070
            }
1071

    
1072
            mismatch^= level;
1073
            block[j] = level;
1074
        }
1075
        CLOSE_READER(re, &s->gb);
1076
    }
1077
    block[63]^= mismatch&1;
1078

    
1079
    s->block_last_index[n] = i;
1080
    return 0;
1081
}
1082

    
1083
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1084
                               DCTELEM *block,
1085
                               int n)
1086
{
1087
    int level, dc, diff, j, run;
1088
    int component;
1089
    RLTable *rl;
1090
    uint8_t * scantable= s->intra_scantable.permutated;
1091
    const uint16_t *quant_matrix;
1092
    const int qscale= s->qscale;
1093

    
1094
    /* DC coef */
1095
    if (n < 4){
1096
        quant_matrix = s->intra_matrix;
1097
        component = 0;
1098
    }else{
1099
        quant_matrix = s->chroma_intra_matrix;
1100
        component = (n&1) + 1;
1101
    }
1102
    diff = decode_dc(&s->gb, component);
1103
    if (diff >= 0xffff)
1104
        return -1;
1105
    dc = s->last_dc[component];
1106
    dc += diff;
1107
    s->last_dc[component] = dc;
1108
    block[0] = dc << (3 - s->intra_dc_precision);
1109
    if (s->intra_vlc_format)
1110
        rl = &ff_rl_mpeg2;
1111
    else
1112
        rl = &ff_rl_mpeg1;
1113

    
1114
    {
1115
        OPEN_READER(re, &s->gb);
1116
        /* now quantify & encode AC coefs */
1117
        for(;;) {
1118
            UPDATE_CACHE(re, &s->gb);
1119
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1120

    
1121
            if(level == 127){
1122
                break;
1123
            } else if(level != 0) {
1124
                scantable += run;
1125
                j = *scantable;
1126
                level= (level*qscale*quant_matrix[j])>>4;
1127
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1128
                LAST_SKIP_BITS(re, &s->gb, 1);
1129
            } else {
1130
                /* escape */
1131
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1132
                UPDATE_CACHE(re, &s->gb);
1133
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1134
                scantable += run;
1135
                j = *scantable;
1136
                if(level<0){
1137
                    level= (-level*qscale*quant_matrix[j])>>4;
1138
                    level= -level;
1139
                }else{
1140
                    level= (level*qscale*quant_matrix[j])>>4;
1141
                }
1142
            }
1143

    
1144
            block[j] = level;
1145
        }
1146
        CLOSE_READER(re, &s->gb);
1147
    }
1148

    
1149
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1150
    return 0;
1151
}
1152

    
1153
typedef struct Mpeg1Context {
1154
    MpegEncContext mpeg_enc_ctx;
1155
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1156
    int repeat_field; /* true if we must repeat the field */
1157
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1158
    int slice_count;
1159
    int swap_uv;//indicate VCR2
1160
    int save_aspect_info;
1161
    int save_width, save_height;
1162
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1163

    
1164
} Mpeg1Context;
1165

    
1166
static int mpeg_decode_init(AVCodecContext *avctx)
1167
{
1168
    Mpeg1Context *s = avctx->priv_data;
1169
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1170
    int i;
1171

    
1172
    //we need some parmutation to store
1173
    //matrixes, until MPV_common_init()
1174
    //set the real permutatuon
1175
    for(i=0;i<64;i++)
1176
       s2->dsp.idct_permutation[i]=i;
1177

    
1178
    MPV_decode_defaults(s2);
1179

    
1180
    s->mpeg_enc_ctx.avctx= avctx;
1181
    s->mpeg_enc_ctx.flags= avctx->flags;
1182
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1183
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1184
    init_vlcs();
1185

    
1186
    s->mpeg_enc_ctx_allocated = 0;
1187
    s->mpeg_enc_ctx.picture_number = 0;
1188
    s->repeat_field = 0;
1189
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1190
    return 0;
1191
}
1192

    
1193
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1194
                                     const uint8_t *new_perm){
1195
    uint16_t temp_matrix[64];
1196
    int i;
1197

    
1198
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1199

    
1200
    for(i=0;i<64;i++){
1201
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1202
    }
1203
}
1204

    
1205
//Call this function when we know all parameters
1206
//it may be called in different places for mpeg1 and mpeg2
1207
static int mpeg_decode_postinit(AVCodecContext *avctx){
1208
    Mpeg1Context *s1 = avctx->priv_data;
1209
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1210
    uint8_t old_permutation[64];
1211

    
1212
    if (
1213
        (s1->mpeg_enc_ctx_allocated == 0)||
1214
        avctx->coded_width  != s->width ||
1215
        avctx->coded_height != s->height||
1216
        s1->save_width != s->width ||
1217
        s1->save_height != s->height ||
1218
        s1->save_aspect_info != s->aspect_ratio_info||
1219
        0)
1220
    {
1221

    
1222
        if (s1->mpeg_enc_ctx_allocated) {
1223
            ParseContext pc= s->parse_context;
1224
            s->parse_context.buffer=0;
1225
            MPV_common_end(s);
1226
            s->parse_context= pc;
1227
        }
1228

    
1229
        if( (s->width == 0 )||(s->height == 0))
1230
            return -2;
1231

    
1232
        avcodec_set_dimensions(avctx, s->width, s->height);
1233
        avctx->bit_rate = s->bit_rate;
1234
        s1->save_aspect_info = s->aspect_ratio_info;
1235
        s1->save_width = s->width;
1236
        s1->save_height = s->height;
1237

    
1238
     //low_delay may be forced, in this case we will have B frames
1239
     //that behave like P frames
1240
        avctx->has_b_frames = !(s->low_delay);
1241

    
1242
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1243
            //mpeg1 fps
1244
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1245
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1246
            //mpeg1 aspect
1247
            avctx->sample_aspect_ratio= av_d2q(
1248
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1249

    
1250
        }else{//mpeg2
1251
        //mpeg2 fps
1252
            av_reduce(
1253
                &s->avctx->time_base.den,
1254
                &s->avctx->time_base.num,
1255
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1256
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1257
                1<<30);
1258
        //mpeg2 aspect
1259
            if(s->aspect_ratio_info > 1){
1260
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1261
                    s->avctx->sample_aspect_ratio=
1262
                        av_div_q(
1263
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1264
                         (AVRational){s->width, s->height}
1265
                         );
1266
                }else{
1267
                    s->avctx->sample_aspect_ratio=
1268
                        av_div_q(
1269
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1270
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1271
                        );
1272
                }
1273
            }else{
1274
                s->avctx->sample_aspect_ratio=
1275
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1276
            }
1277
        }//mpeg2
1278

    
1279
        if(avctx->xvmc_acceleration){
1280
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1281
        }else{
1282
            if(s->chroma_format <  2){
1283
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1284
            }else
1285
            if(s->chroma_format == 2){
1286
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1287
            }else
1288
            if(s->chroma_format >  2){
1289
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1290
            }
1291
        }
1292
        //until then pix_fmt may be changed right after codec init
1293
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1294
            if( avctx->idct_algo == FF_IDCT_AUTO )
1295
                avctx->idct_algo = FF_IDCT_SIMPLE;
1296

    
1297
        //quantization matrixes may need reordering
1298
        //if dct permutation is changed
1299
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1300

    
1301
        if (MPV_common_init(s) < 0)
1302
            return -2;
1303

    
1304
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1305
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1306
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1307
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1308

    
1309
        s1->mpeg_enc_ctx_allocated = 1;
1310
    }
1311
    return 0;
1312
}
1313

    
1314
static int mpeg1_decode_picture(AVCodecContext *avctx,
1315
                                const uint8_t *buf, int buf_size)
1316
{
1317
    Mpeg1Context *s1 = avctx->priv_data;
1318
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1319
    int ref, f_code, vbv_delay;
1320

    
1321
    if(mpeg_decode_postinit(s->avctx) < 0)
1322
       return -2;
1323

    
1324
    init_get_bits(&s->gb, buf, buf_size*8);
1325

    
1326
    ref = get_bits(&s->gb, 10); /* temporal ref */
1327
    s->pict_type = get_bits(&s->gb, 3);
1328
    if(s->pict_type == 0 || s->pict_type > 3)
1329
        return -1;
1330

    
1331
    vbv_delay= get_bits(&s->gb, 16);
1332
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1333
        s->full_pel[0] = get_bits1(&s->gb);
1334
        f_code = get_bits(&s->gb, 3);
1335
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1336
            return -1;
1337
        s->mpeg_f_code[0][0] = f_code;
1338
        s->mpeg_f_code[0][1] = f_code;
1339
    }
1340
    if (s->pict_type == B_TYPE) {
1341
        s->full_pel[1] = get_bits1(&s->gb);
1342
        f_code = get_bits(&s->gb, 3);
1343
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1344
            return -1;
1345
        s->mpeg_f_code[1][0] = f_code;
1346
        s->mpeg_f_code[1][1] = f_code;
1347
    }
1348
    s->current_picture.pict_type= s->pict_type;
1349
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1350

    
1351
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1352
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1353

    
1354
    s->y_dc_scale = 8;
1355
    s->c_dc_scale = 8;
1356
    s->first_slice = 1;
1357
    return 0;
1358
}
1359

    
1360
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1361
{
1362
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1363
    int horiz_size_ext, vert_size_ext;
1364
    int bit_rate_ext;
1365

    
1366
    skip_bits(&s->gb, 1); /* profil and level esc*/
1367
    s->avctx->profile= get_bits(&s->gb, 3);
1368
    s->avctx->level= get_bits(&s->gb, 4);
1369
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1370
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1371
    horiz_size_ext = get_bits(&s->gb, 2);
1372
    vert_size_ext = get_bits(&s->gb, 2);
1373
    s->width |= (horiz_size_ext << 12);
1374
    s->height |= (vert_size_ext << 12);
1375
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1376
    s->bit_rate += (bit_rate_ext << 18) * 400;
1377
    skip_bits1(&s->gb); /* marker */
1378
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1379

    
1380
    s->low_delay = get_bits1(&s->gb);
1381
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1382

    
1383
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1384
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1385

    
1386
    dprintf(s->avctx, "sequence extension\n");
1387
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1388
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1389

    
1390
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1391
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1392
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1393

    
1394
}
1395

    
1396
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1397
{
1398
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1399
    int color_description, w, h;
1400

    
1401
    skip_bits(&s->gb, 3); /* video format */
1402
    color_description= get_bits1(&s->gb);
1403
    if(color_description){
1404
        skip_bits(&s->gb, 8); /* color primaries */
1405
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1406
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1407
    }
1408
    w= get_bits(&s->gb, 14);
1409
    skip_bits(&s->gb, 1); //marker
1410
    h= get_bits(&s->gb, 14);
1411
    skip_bits(&s->gb, 1); //marker
1412

    
1413
    s1->pan_scan.width= 16*w;
1414
    s1->pan_scan.height=16*h;
1415

    
1416
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1417
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1418
}
1419

    
1420
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1421
{
1422
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1423
    int i,nofco;
1424

    
1425
    nofco = 1;
1426
    if(s->progressive_sequence){
1427
        if(s->repeat_first_field){
1428
            nofco++;
1429
            if(s->top_field_first)
1430
                nofco++;
1431
        }
1432
    }else{
1433
        if(s->picture_structure == PICT_FRAME){
1434
            nofco++;
1435
            if(s->repeat_first_field)
1436
                nofco++;
1437
        }
1438
    }
1439
    for(i=0; i<nofco; i++){
1440
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1441
        skip_bits(&s->gb, 1); //marker
1442
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1443
        skip_bits(&s->gb, 1); //marker
1444
    }
1445

    
1446
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1447
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1448
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1449
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1450
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1451
        );
1452
}
1453

    
1454
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1455
{
1456
    int i, v, j;
1457

    
1458
    dprintf(s->avctx, "matrix extension\n");
1459

    
1460
    if (get_bits1(&s->gb)) {
1461
        for(i=0;i<64;i++) {
1462
            v = get_bits(&s->gb, 8);
1463
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1464
            s->intra_matrix[j] = v;
1465
            s->chroma_intra_matrix[j] = v;
1466
        }
1467
    }
1468
    if (get_bits1(&s->gb)) {
1469
        for(i=0;i<64;i++) {
1470
            v = get_bits(&s->gb, 8);
1471
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1472
            s->inter_matrix[j] = v;
1473
            s->chroma_inter_matrix[j] = v;
1474
        }
1475
    }
1476
    if (get_bits1(&s->gb)) {
1477
        for(i=0;i<64;i++) {
1478
            v = get_bits(&s->gb, 8);
1479
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1480
            s->chroma_intra_matrix[j] = v;
1481
        }
1482
    }
1483
    if (get_bits1(&s->gb)) {
1484
        for(i=0;i<64;i++) {
1485
            v = get_bits(&s->gb, 8);
1486
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1487
            s->chroma_inter_matrix[j] = v;
1488
        }
1489
    }
1490
}
1491

    
1492
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1493
{
1494
    s->full_pel[0] = s->full_pel[1] = 0;
1495
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1496
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1497
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1498
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1499
    s->intra_dc_precision = get_bits(&s->gb, 2);
1500
    s->picture_structure = get_bits(&s->gb, 2);
1501
    s->top_field_first = get_bits1(&s->gb);
1502
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1503
    s->concealment_motion_vectors = get_bits1(&s->gb);
1504
    s->q_scale_type = get_bits1(&s->gb);
1505
    s->intra_vlc_format = get_bits1(&s->gb);
1506
    s->alternate_scan = get_bits1(&s->gb);
1507
    s->repeat_first_field = get_bits1(&s->gb);
1508
    s->chroma_420_type = get_bits1(&s->gb);
1509
    s->progressive_frame = get_bits1(&s->gb);
1510

    
1511
    if(s->picture_structure == PICT_FRAME){
1512
        s->first_field=0;
1513
        s->v_edge_pos= 16*s->mb_height;
1514
    }else{
1515
        s->first_field ^= 1;
1516
        s->v_edge_pos=  8*s->mb_height;
1517
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1518
    }
1519

    
1520
    if(s->alternate_scan){
1521
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1522
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1523
    }else{
1524
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1525
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1526
    }
1527

    
1528
    /* composite display not parsed */
1529
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1530
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1531
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1532
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1533
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1534
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1535
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1536
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1537
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1538
}
1539

    
1540
static void mpeg_decode_extension(AVCodecContext *avctx,
1541
                                  const uint8_t *buf, int buf_size)
1542
{
1543
    Mpeg1Context *s1 = avctx->priv_data;
1544
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1545
    int ext_type;
1546

    
1547
    init_get_bits(&s->gb, buf, buf_size*8);
1548

    
1549
    ext_type = get_bits(&s->gb, 4);
1550
    switch(ext_type) {
1551
    case 0x1:
1552
        mpeg_decode_sequence_extension(s1);
1553
        break;
1554
    case 0x2:
1555
        mpeg_decode_sequence_display_extension(s1);
1556
        break;
1557
    case 0x3:
1558
        mpeg_decode_quant_matrix_extension(s);
1559
        break;
1560
    case 0x7:
1561
        mpeg_decode_picture_display_extension(s1);
1562
        break;
1563
    case 0x8:
1564
        mpeg_decode_picture_coding_extension(s);
1565
        break;
1566
    }
1567
}
1568

    
1569
static void exchange_uv(MpegEncContext *s){
1570
    short * tmp = s->pblocks[4];
1571
    s->pblocks[4] = s->pblocks[5];
1572
    s->pblocks[5] = tmp;
1573
}
1574

    
1575
static int mpeg_field_start(MpegEncContext *s){
1576
    AVCodecContext *avctx= s->avctx;
1577
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1578

    
1579
    /* start frame decoding */
1580
    if(s->first_field || s->picture_structure==PICT_FRAME){
1581
        if(MPV_frame_start(s, avctx) < 0)
1582
            return -1;
1583

    
1584
        ff_er_frame_start(s);
1585

    
1586
        /* first check if we must repeat the frame */
1587
        s->current_picture_ptr->repeat_pict = 0;
1588
        if (s->repeat_first_field) {
1589
            if (s->progressive_sequence) {
1590
                if (s->top_field_first)
1591
                    s->current_picture_ptr->repeat_pict = 4;
1592
                else
1593
                    s->current_picture_ptr->repeat_pict = 2;
1594
            } else if (s->progressive_frame) {
1595
                s->current_picture_ptr->repeat_pict = 1;
1596
            }
1597
        }
1598

    
1599
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1600
    }else{ //second field
1601
            int i;
1602

    
1603
            if(!s->current_picture_ptr){
1604
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1605
                return -1;
1606
            }
1607

    
1608
            for(i=0; i<4; i++){
1609
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1610
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1611
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1612
                }
1613
            }
1614
    }
1615
#ifdef HAVE_XVMC
1616
// MPV_frame_start will call this function too,
1617
// but we need to call it on every field
1618
    if(s->avctx->xvmc_acceleration)
1619
         XVMC_field_start(s,avctx);
1620
#endif
1621

    
1622
    return 0;
1623
}
1624

    
1625
#define DECODE_SLICE_ERROR -1
1626
#define DECODE_SLICE_OK 0
1627

    
1628
/**
1629
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1630
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1631
 *         DECODE_SLICE_OK if this slice is ok<br>
1632
 */
1633
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1634
                             const uint8_t **buf, int buf_size)
1635
{
1636
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1637
    AVCodecContext *avctx= s->avctx;
1638
    const int field_pic= s->picture_structure != PICT_FRAME;
1639
    const int lowres= s->avctx->lowres;
1640

    
1641
    s->resync_mb_x=
1642
    s->resync_mb_y= -1;
1643

    
1644
    if (mb_y<<field_pic >= s->mb_height){
1645
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1646
        return -1;
1647
    }
1648

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

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

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

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

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

    
1666
    s->mb_x=0;
1667

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

    
1689
    s->resync_mb_x= s->mb_x;
1690
    s->resync_mb_y= s->mb_y= mb_y;
1691
    s->mb_skip_run= 0;
1692
    ff_init_block_index(s);
1693

    
1694
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1695
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1696
             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",
1697
                 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],
1698
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1699
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1700
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1701
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1702
        }
1703
    }
1704

    
1705
    for(;;) {
1706
#ifdef HAVE_XVMC
1707
        //one 1 we memcpy blocks in xvmcvideo
1708
        if(s->avctx->xvmc_acceleration > 1)
1709
            XVMC_init_block(s);//set s->block
1710
#endif
1711

    
1712
        if(mpeg_decode_mb(s, s->block) < 0)
1713
            return -1;
1714

    
1715
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1716
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1717
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1718
            int motion_x, motion_y, dir, i;
1719
            if(field_pic && !s->first_field)
1720
                xy += wrap/2;
1721

    
1722
            for(i=0; i<2; i++){
1723
                for(dir=0; dir<2; dir++){
1724
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1725
                        motion_x = motion_y = 0;
1726
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1727
                        motion_x = s->mv[dir][0][0];
1728
                        motion_y = s->mv[dir][0][1];
1729
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1730
                        motion_x = s->mv[dir][i][0];
1731
                        motion_y = s->mv[dir][i][1];
1732
                    }
1733

    
1734
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1735
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1736
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1737
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1738
                    s->current_picture.ref_index [dir][xy    ]=
1739
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1740
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1741
                }
1742
                xy += wrap;
1743
            }
1744
        }
1745

    
1746
        s->dest[0] += 16 >> lowres;
1747
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1748
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1749

    
1750
        MPV_decode_mb(s, s->block);
1751

    
1752
        if (++s->mb_x >= s->mb_width) {
1753
            const int mb_size= 16>>s->avctx->lowres;
1754

    
1755
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1756

    
1757
            s->mb_x = 0;
1758
            s->mb_y++;
1759

    
1760
            if(s->mb_y<<field_pic >= s->mb_height){
1761
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1762
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1763
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1764
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1765

    
1766
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1767
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1768
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1769
                    return -1;
1770
                }else
1771
                    goto eos;
1772
            }
1773

    
1774
            ff_init_block_index(s);
1775
        }
1776

    
1777
        /* skip mb handling */
1778
        if (s->mb_skip_run == -1) {
1779
            /* read again increment */
1780
            s->mb_skip_run = 0;
1781
            for(;;) {
1782
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1783
                if (code < 0){
1784
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1785
                    return -1;
1786
                }
1787
                if (code >= 33) {
1788
                    if (code == 33) {
1789
                        s->mb_skip_run += 33;
1790
                    }else if(code == 35){
1791
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1792
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1793
                            return -1;
1794
                        }
1795
                        goto eos; /* end of slice */
1796
                    }
1797
                    /* otherwise, stuffing, nothing to do */
1798
                } else {
1799
                    s->mb_skip_run += code;
1800
                    break;
1801
                }
1802
            }
1803
            if(s->mb_skip_run){
1804
                int i;
1805
                if(s->pict_type == I_TYPE){
1806
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1807
                    return -1;
1808
                }
1809

    
1810
                /* skip mb */
1811
                s->mb_intra = 0;
1812
                for(i=0;i<12;i++)
1813
                    s->block_last_index[i] = -1;
1814
                if(s->picture_structure == PICT_FRAME)
1815
                    s->mv_type = MV_TYPE_16X16;
1816
                else
1817
                    s->mv_type = MV_TYPE_FIELD;
1818
                if (s->pict_type == P_TYPE) {
1819
                    /* if P type, zero motion vector is implied */
1820
                    s->mv_dir = MV_DIR_FORWARD;
1821
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1822
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1823
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1824
                    s->field_select[0][0]= s->picture_structure - 1;
1825
                } else {
1826
                    /* if B type, reuse previous vectors and directions */
1827
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1828
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1829
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1830
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1831
                }
1832
            }
1833
        }
1834
    }
1835
eos: // end of slice
1836
    *buf += get_bits_count(&s->gb)/8 - 1;
1837
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1838
    return 0;
1839
}
1840

    
1841
static int slice_decode_thread(AVCodecContext *c, void *arg){
1842
    MpegEncContext *s= arg;
1843
    const uint8_t *buf= s->gb.buffer;
1844
    int mb_y= s->start_mb_y;
1845

    
1846
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1847

    
1848
    for(;;){
1849
        uint32_t start_code;
1850
        int ret;
1851

    
1852
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1853
        emms_c();
1854
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1855
//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);
1856
        if(ret < 0){
1857
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1858
                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);
1859
        }else{
1860
            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);
1861
        }
1862

    
1863
        if(s->mb_y == s->end_mb_y)
1864
            return 0;
1865

    
1866
        start_code= -1;
1867
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1868
        mb_y= start_code - SLICE_MIN_START_CODE;
1869
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1870
            return -1;
1871
    }
1872

    
1873
    return 0; //not reached
1874
}
1875

    
1876
/**
1877
 * handles slice ends.
1878
 * @return 1 if it seems to be the last slice of
1879
 */
1880
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1881
{
1882
    Mpeg1Context *s1 = avctx->priv_data;
1883
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1884

    
1885
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1886
        return 0;
1887

    
1888
#ifdef HAVE_XVMC
1889
    if(s->avctx->xvmc_acceleration)
1890
        XVMC_field_end(s);
1891
#endif
1892
    /* end of slice reached */
1893
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1894
        /* end of image */
1895

    
1896
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1897

    
1898
        ff_er_frame_end(s);
1899

    
1900
        MPV_frame_end(s);
1901

    
1902
        if (s->pict_type == B_TYPE || s->low_delay) {
1903
            *pict= *(AVFrame*)s->current_picture_ptr;
1904
            ff_print_debug_info(s, pict);
1905
        } else {
1906
            s->picture_number++;
1907
            /* latency of 1 frame for I and P frames */
1908
            /* XXX: use another variable than picture_number */
1909
            if (s->last_picture_ptr != NULL) {
1910
                *pict= *(AVFrame*)s->last_picture_ptr;
1911
                 ff_print_debug_info(s, pict);
1912
            }
1913
        }
1914

    
1915
        return 1;
1916
    } else {
1917
        return 0;
1918
    }
1919
}
1920

    
1921
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1922
                                 const uint8_t *buf, int buf_size)
1923
{
1924
    Mpeg1Context *s1 = avctx->priv_data;
1925
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1926
    int width,height;
1927
    int i, v, j;
1928

    
1929
    init_get_bits(&s->gb, buf, buf_size*8);
1930

    
1931
    width = get_bits(&s->gb, 12);
1932
    height = get_bits(&s->gb, 12);
1933
    if (width <= 0 || height <= 0 ||
1934
        (width % 2) != 0 || (height % 2) != 0)
1935
        return -1;
1936
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1937
    if (s->aspect_ratio_info == 0)
1938
        return -1;
1939
    s->frame_rate_index = get_bits(&s->gb, 4);
1940
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1941
        return -1;
1942
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1943
    if (get_bits1(&s->gb) == 0) /* marker */
1944
        return -1;
1945
    s->width = width;
1946
    s->height = height;
1947

    
1948
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1949
    skip_bits(&s->gb, 1);
1950

    
1951
    /* get matrix */
1952
    if (get_bits1(&s->gb)) {
1953
        for(i=0;i<64;i++) {
1954
            v = get_bits(&s->gb, 8);
1955
            if(v==0){
1956
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1957
                return -1;
1958
            }
1959
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1960
            s->intra_matrix[j] = v;
1961
            s->chroma_intra_matrix[j] = v;
1962
        }
1963
#ifdef DEBUG
1964
        dprintf(s->avctx, "intra matrix present\n");
1965
        for(i=0;i<64;i++)
1966
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1967
        dprintf(s->avctx, "\n");
1968
#endif
1969
    } else {
1970
        for(i=0;i<64;i++) {
1971
            j = s->dsp.idct_permutation[i];
1972
            v = ff_mpeg1_default_intra_matrix[i];
1973
            s->intra_matrix[j] = v;
1974
            s->chroma_intra_matrix[j] = v;
1975
        }
1976
    }
1977
    if (get_bits1(&s->gb)) {
1978
        for(i=0;i<64;i++) {
1979
            v = get_bits(&s->gb, 8);
1980
            if(v==0){
1981
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1982
                return -1;
1983
            }
1984
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1985
            s->inter_matrix[j] = v;
1986
            s->chroma_inter_matrix[j] = v;
1987
        }
1988
#ifdef DEBUG
1989
        dprintf(s->avctx, "non intra matrix present\n");
1990
        for(i=0;i<64;i++)
1991
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1992
        dprintf(s->avctx, "\n");
1993
#endif
1994
    } else {
1995
        for(i=0;i<64;i++) {
1996
            int j= s->dsp.idct_permutation[i];
1997
            v = ff_mpeg1_default_non_intra_matrix[i];
1998
            s->inter_matrix[j] = v;
1999
            s->chroma_inter_matrix[j] = v;
2000
        }
2001
    }
2002

    
2003
    if(show_bits(&s->gb, 23) != 0){
2004
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2005
        return -1;
2006
    }
2007

    
2008
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2009
    s->progressive_sequence = 1;
2010
    s->progressive_frame = 1;
2011
    s->picture_structure = PICT_FRAME;
2012
    s->frame_pred_frame_dct = 1;
2013
    s->chroma_format = 1;
2014
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2015
    avctx->sub_id = 1; /* indicates mpeg1 */
2016
    s->out_format = FMT_MPEG1;
2017
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2018
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2019

    
2020
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2021
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2022
               s->avctx->rc_buffer_size, s->bit_rate);
2023

    
2024
    return 0;
2025
}
2026

    
2027
static int vcr2_init_sequence(AVCodecContext *avctx)
2028
{
2029
    Mpeg1Context *s1 = avctx->priv_data;
2030
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2031
    int i, v;
2032

    
2033
    /* start new mpeg1 context decoding */
2034
    s->out_format = FMT_MPEG1;
2035
    if (s1->mpeg_enc_ctx_allocated) {
2036
        MPV_common_end(s);
2037
    }
2038
    s->width  = avctx->coded_width;
2039
    s->height = avctx->coded_height;
2040
    avctx->has_b_frames= 0; //true?
2041
    s->low_delay= 1;
2042

    
2043
    if(avctx->xvmc_acceleration){
2044
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2045
    }else{
2046
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2047
    }
2048

    
2049
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2050
        if( avctx->idct_algo == FF_IDCT_AUTO )
2051
            avctx->idct_algo = FF_IDCT_SIMPLE;
2052

    
2053
    if (MPV_common_init(s) < 0)
2054
        return -1;
2055
    exchange_uv(s);//common init reset pblocks, so we swap them here
2056
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2057
    s1->mpeg_enc_ctx_allocated = 1;
2058

    
2059
    for(i=0;i<64;i++) {
2060
        int j= s->dsp.idct_permutation[i];
2061
        v = ff_mpeg1_default_intra_matrix[i];
2062
        s->intra_matrix[j] = v;
2063
        s->chroma_intra_matrix[j] = v;
2064

    
2065
        v = ff_mpeg1_default_non_intra_matrix[i];
2066
        s->inter_matrix[j] = v;
2067
        s->chroma_inter_matrix[j] = v;
2068
    }
2069

    
2070
    s->progressive_sequence = 1;
2071
    s->progressive_frame = 1;
2072
    s->picture_structure = PICT_FRAME;
2073
    s->frame_pred_frame_dct = 1;
2074
    s->chroma_format = 1;
2075
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2076
    avctx->sub_id = 2; /* indicates mpeg2 */
2077
    return 0;
2078
}
2079

    
2080

    
2081
static void mpeg_decode_user_data(AVCodecContext *avctx,
2082
                                  const uint8_t *buf, int buf_size)
2083
{
2084
    const uint8_t *p;
2085
    int len, flags;
2086
    p = buf;
2087
    len = buf_size;
2088

    
2089
    /* we parse the DTG active format information */
2090
    if (len >= 5 &&
2091
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2092
        flags = p[4];
2093
        p += 5;
2094
        len -= 5;
2095
        if (flags & 0x80) {
2096
            /* skip event id */
2097
            if (len < 2)
2098
                return;
2099
            p += 2;
2100
            len -= 2;
2101
        }
2102
        if (flags & 0x40) {
2103
            if (len < 1)
2104
                return;
2105
            avctx->dtg_active_format = p[0] & 0x0f;
2106
        }
2107
    }
2108
}
2109

    
2110
static void mpeg_decode_gop(AVCodecContext *avctx,
2111
                            const uint8_t *buf, int buf_size){
2112
    Mpeg1Context *s1 = avctx->priv_data;
2113
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2114

    
2115
    int drop_frame_flag;
2116
    int time_code_hours, time_code_minutes;
2117
    int time_code_seconds, time_code_pictures;
2118
    int broken_link;
2119

    
2120
    init_get_bits(&s->gb, buf, buf_size*8);
2121

    
2122
    drop_frame_flag = get_bits1(&s->gb);
2123

    
2124
    time_code_hours=get_bits(&s->gb,5);
2125
    time_code_minutes = get_bits(&s->gb,6);
2126
    skip_bits1(&s->gb);//marker bit
2127
    time_code_seconds = get_bits(&s->gb,6);
2128
    time_code_pictures = get_bits(&s->gb,6);
2129

    
2130
    /*broken_link indicate that after editing the
2131
      reference frames of the first B-Frames after GOP I-Frame
2132
      are missing (open gop)*/
2133
    broken_link = get_bits1(&s->gb);
2134

    
2135
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2136
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2137
            time_code_hours, time_code_minutes, time_code_seconds,
2138
            time_code_pictures, broken_link);
2139
}
2140
/**
2141
 * finds the end of the current frame in the bitstream.
2142
 * @return the position of the first byte of the next frame, or -1
2143
 */
2144
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2145
{
2146
    int i;
2147
    uint32_t state= pc->state;
2148

    
2149
    i=0;
2150
    if(!pc->frame_start_found){
2151
        for(i=0; i<buf_size; i++){
2152
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2153
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2154
                i++;
2155
                pc->frame_start_found=1;
2156
                break;
2157
            }
2158
        }
2159
    }
2160

    
2161
    if(pc->frame_start_found){
2162
        /* EOF considered as end of frame */
2163
        if (buf_size == 0)
2164
            return 0;
2165
        for(; i<buf_size; i++){
2166
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2167
            if((state&0xFFFFFF00) == 0x100){
2168
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2169
                    pc->frame_start_found=0;
2170
                    pc->state=-1;
2171
                    return i-3;
2172
                }
2173
            }
2174
        }
2175
    }
2176
    pc->state= state;
2177
    return END_NOT_FOUND;
2178
}
2179

    
2180
/* handle buffering and image synchronisation */
2181
static int mpeg_decode_frame(AVCodecContext *avctx,
2182
                             void *data, int *data_size,
2183
                             uint8_t *buf, int buf_size)
2184
{
2185
    Mpeg1Context *s = avctx->priv_data;
2186
    const uint8_t *buf_end;
2187
    const uint8_t *buf_ptr;
2188
    uint32_t start_code;
2189
    int ret, input_size;
2190
    AVFrame *picture = data;
2191
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2192
    dprintf(avctx, "fill_buffer\n");
2193

    
2194
    if (buf_size == 0) {
2195
        /* special case for last picture */
2196
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2197
            *picture= *(AVFrame*)s2->next_picture_ptr;
2198
            s2->next_picture_ptr= NULL;
2199

    
2200
            *data_size = sizeof(AVFrame);
2201
        }
2202
        return 0;
2203
    }
2204

    
2205
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2206
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2207

    
2208
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2209
            return buf_size;
2210
    }
2211

    
2212
    buf_ptr = buf;
2213
    buf_end = buf + buf_size;
2214

    
2215
#if 0
2216
    if (s->repeat_field % 2 == 1) {
2217
        s->repeat_field++;
2218
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2219
        //        s2->picture_number, s->repeat_field);
2220
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2221
            *data_size = sizeof(AVPicture);
2222
            goto the_end;
2223
        }
2224
    }
2225
#endif
2226

    
2227
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2228
        vcr2_init_sequence(avctx);
2229

    
2230
    s->slice_count= 0;
2231

    
2232
    for(;;) {
2233
        /* find start next code */
2234
        start_code = -1;
2235
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2236
        if (start_code > 0x1ff){
2237
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2238
                if(avctx->thread_count > 1){
2239
                    int i;
2240

    
2241
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2242
                    for(i=0; i<s->slice_count; i++)
2243
                        s2->error_count += s2->thread_context[i]->error_count;
2244
                }
2245
                if (slice_end(avctx, picture)) {
2246
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2247
                        *data_size = sizeof(AVPicture);
2248
                }
2249
            }
2250
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2251
        }
2252

    
2253
        input_size = buf_end - buf_ptr;
2254

    
2255
        if(avctx->debug & FF_DEBUG_STARTCODE){
2256
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2257
        }
2258

    
2259
        /* prepare data for next start code */
2260
        switch(start_code) {
2261
        case SEQ_START_CODE:
2262
            mpeg1_decode_sequence(avctx, buf_ptr,
2263
                                    input_size);
2264
            break;
2265

    
2266
        case PICTURE_START_CODE:
2267
            /* we have a complete image : we try to decompress it */
2268
            mpeg1_decode_picture(avctx,
2269
                                    buf_ptr, input_size);
2270
            break;
2271
        case EXT_START_CODE:
2272
            mpeg_decode_extension(avctx,
2273
                                    buf_ptr, input_size);
2274
            break;
2275
        case USER_START_CODE:
2276
            mpeg_decode_user_data(avctx,
2277
                                    buf_ptr, input_size);
2278
            break;
2279
        case GOP_START_CODE:
2280
            s2->first_field=0;
2281
            mpeg_decode_gop(avctx,
2282
                                    buf_ptr, input_size);
2283
            break;
2284
        default:
2285
            if (start_code >= SLICE_MIN_START_CODE &&
2286
                start_code <= SLICE_MAX_START_CODE) {
2287
                int mb_y= start_code - SLICE_MIN_START_CODE;
2288

    
2289
                if(s2->last_picture_ptr==NULL){
2290
                /* Skip B-frames if we do not have reference frames. */
2291
                    if(s2->pict_type==B_TYPE) break;
2292
                /* Skip P-frames if we do not have reference frame no valid header. */
2293
//                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2294
                }
2295
                /* Skip B-frames if we are in a hurry. */
2296
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2297
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2298
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2299
                    || avctx->skip_frame >= AVDISCARD_ALL)
2300
                    break;
2301
                /* Skip everything if we are in a hurry>=5. */
2302
                if(avctx->hurry_up>=5) break;
2303

    
2304
                if (!s->mpeg_enc_ctx_allocated) break;
2305

    
2306
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2307
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2308
                        break;
2309
                }
2310

    
2311
                if(s2->first_slice){
2312
                    s2->first_slice=0;
2313
                            if(mpeg_field_start(s2) < 0)
2314
                        return -1;
2315
                    }
2316
                if(!s2->current_picture_ptr){
2317
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2318
                    return -1;
2319
                }
2320

    
2321
                if(avctx->thread_count > 1){
2322
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2323
                    if(threshold <= mb_y){
2324
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2325

    
2326
                        thread_context->start_mb_y= mb_y;
2327
                        thread_context->end_mb_y  = s2->mb_height;
2328
                        if(s->slice_count){
2329
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2330
                            ff_update_duplicate_context(thread_context, s2);
2331
                        }
2332
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2333
                        s->slice_count++;
2334
                    }
2335
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
2336
                }else{
2337
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2338
                    emms_c();
2339

    
2340
                    if(ret < 0){
2341
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2342
                            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);
2343
                    }else{
2344
                        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);
2345
                    }
2346
                }
2347
            }
2348
            break;
2349
        }
2350
    }
2351
}
2352

    
2353
static int mpeg_decode_end(AVCodecContext *avctx)
2354
{
2355
    Mpeg1Context *s = avctx->priv_data;
2356

    
2357
    if (s->mpeg_enc_ctx_allocated)
2358
        MPV_common_end(&s->mpeg_enc_ctx);
2359
    return 0;
2360
}
2361

    
2362
AVCodec mpeg1video_decoder = {
2363
    "mpeg1video",
2364
    CODEC_TYPE_VIDEO,
2365
    CODEC_ID_MPEG1VIDEO,
2366
    sizeof(Mpeg1Context),
2367
    mpeg_decode_init,
2368
    NULL,
2369
    mpeg_decode_end,
2370
    mpeg_decode_frame,
2371
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2372
    .flush= ff_mpeg_flush,
2373
};
2374

    
2375
AVCodec mpeg2video_decoder = {
2376
    "mpeg2video",
2377
    CODEC_TYPE_VIDEO,
2378
    CODEC_ID_MPEG2VIDEO,
2379
    sizeof(Mpeg1Context),
2380
    mpeg_decode_init,
2381
    NULL,
2382
    mpeg_decode_end,
2383
    mpeg_decode_frame,
2384
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2385
    .flush= ff_mpeg_flush,
2386
};
2387

    
2388
//legacy decoder
2389
AVCodec mpegvideo_decoder = {
2390
    "mpegvideo",
2391
    CODEC_TYPE_VIDEO,
2392
    CODEC_ID_MPEG2VIDEO,
2393
    sizeof(Mpeg1Context),
2394
    mpeg_decode_init,
2395
    NULL,
2396
    mpeg_decode_end,
2397
    mpeg_decode_frame,
2398
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2399
    .flush= ff_mpeg_flush,
2400
};
2401

    
2402
#ifdef HAVE_XVMC
2403
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2404
    Mpeg1Context *s;
2405

    
2406
    if( avctx->thread_count > 1)
2407
        return -1;
2408
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2409
        return -1;
2410
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2411
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2412
    }
2413
    mpeg_decode_init(avctx);
2414
    s = avctx->priv_data;
2415

    
2416
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2417
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2418

    
2419
    return 0;
2420
}
2421

    
2422
AVCodec mpeg_xvmc_decoder = {
2423
    "mpegvideo_xvmc",
2424
    CODEC_TYPE_VIDEO,
2425
    CODEC_ID_MPEG2VIDEO_XVMC,
2426
    sizeof(Mpeg1Context),
2427
    mpeg_mc_decode_init,
2428
    NULL,
2429
    mpeg_decode_end,
2430
    mpeg_decode_frame,
2431
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2432
    .flush= ff_mpeg_flush,
2433
};
2434

    
2435
#endif
2436

    
2437
/* this is ugly i know, but the alternative is too make
2438
   hundreds of vars global and prefix them with ff_mpeg1_
2439
   which is far uglier. */
2440
#include "mdec.c"