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ffmpeg / libavcodec / mpeg12.c @ 037df60e

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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
 *
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 * 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

    
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
53
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
56
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
57
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
58
                                        DCTELEM *block,
59
                                        int n);
60
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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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);
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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,
78
                                           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
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
370
                    s->interlaced_dct = get_bits1(&s->gb);
371
            }
372

    
373
            if (IS_QUANT(mb_type))
374
                s->qscale = get_qscale(s);
375

    
376
            /* motion vectors */
377
            s->mv_dir= (mb_type>>13)&3;
378
            dprintf(s->avctx, "motion_type=%d\n", motion_type);
379
            switch(motion_type) {
380
            case MT_FRAME: /* or MT_16X8 */
381
                if (s->picture_structure == PICT_FRAME) {
382
                    mb_type |= MB_TYPE_16x16;
383
                    s->mv_type = MV_TYPE_16X16;
384
                    for(i=0;i<2;i++) {
385
                        if (USES_LIST(mb_type, i)) {
386
                            /* MT_FRAME */
387
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
388
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
389
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
390
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
391
                            /* full_pel: only for mpeg1 */
392
                            if (s->full_pel[i]){
393
                                s->mv[i][0][0] <<= 1;
394
                                s->mv[i][0][1] <<= 1;
395
                            }
396
                        }
397
                    }
398
                } else {
399
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
400
                    s->mv_type = MV_TYPE_16X8;
401
                    for(i=0;i<2;i++) {
402
                        if (USES_LIST(mb_type, i)) {
403
                            /* MT_16X8 */
404
                            for(j=0;j<2;j++) {
405
                                s->field_select[i][j] = get_bits1(&s->gb);
406
                                for(k=0;k<2;k++) {
407
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
408
                                                             s->last_mv[i][j][k]);
409
                                    s->last_mv[i][j][k] = val;
410
                                    s->mv[i][j][k] = val;
411
                                }
412
                            }
413
                        }
414
                    }
415
                }
416
                break;
417
            case MT_FIELD:
418
                s->mv_type = MV_TYPE_FIELD;
419
                if (s->picture_structure == PICT_FRAME) {
420
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
421
                    for(i=0;i<2;i++) {
422
                        if (USES_LIST(mb_type, i)) {
423
                            for(j=0;j<2;j++) {
424
                                s->field_select[i][j] = get_bits1(&s->gb);
425
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
426
                                                         s->last_mv[i][j][0]);
427
                                s->last_mv[i][j][0] = val;
428
                                s->mv[i][j][0] = val;
429
                                dprintf(s->avctx, "fmx=%d\n", val);
430
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
431
                                                         s->last_mv[i][j][1] >> 1);
432
                                s->last_mv[i][j][1] = val << 1;
433
                                s->mv[i][j][1] = val;
434
                                dprintf(s->avctx, "fmy=%d\n", val);
435
                            }
436
                        }
437
                    }
438
                } else {
439
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
440
                    for(i=0;i<2;i++) {
441
                        if (USES_LIST(mb_type, i)) {
442
                            s->field_select[i][0] = get_bits1(&s->gb);
443
                            for(k=0;k<2;k++) {
444
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
445
                                                         s->last_mv[i][0][k]);
446
                                s->last_mv[i][0][k] = val;
447
                                s->last_mv[i][1][k] = val;
448
                                s->mv[i][0][k] = val;
449
                            }
450
                        }
451
                    }
452
                }
453
                break;
454
            case MT_DMV:
455
                s->mv_type = MV_TYPE_DMV;
456
                for(i=0;i<2;i++) {
457
                    if (USES_LIST(mb_type, i)) {
458
                        int dmx, dmy, mx, my, m;
459
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
460
                                                s->last_mv[i][0][0]);
461
                        s->last_mv[i][0][0] = mx;
462
                        s->last_mv[i][1][0] = mx;
463
                        dmx = get_dmv(s);
464
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
465
                                                s->last_mv[i][0][1] >> 1);
466
                        dmy = get_dmv(s);
467

    
468

    
469
                        s->last_mv[i][0][1] = my<<1;
470
                        s->last_mv[i][1][1] = my<<1;
471

    
472
                        s->mv[i][0][0] = mx;
473
                        s->mv[i][0][1] = my;
474
                        s->mv[i][1][0] = mx;//not used
475
                        s->mv[i][1][1] = my;//not used
476

    
477
                        if (s->picture_structure == PICT_FRAME) {
478
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
479

    
480
                            //m = 1 + 2 * s->top_field_first;
481
                            m = s->top_field_first ? 1 : 3;
482

    
483
                            /* top -> top pred */
484
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
485
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
486
                            m = 4 - m;
487
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
488
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
489
                        } else {
490
                            mb_type |= MB_TYPE_16x16;
491

    
492
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
493
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
494
                            if(s->picture_structure == PICT_TOP_FIELD)
495
                                s->mv[i][2][1]--;
496
                            else
497
                                s->mv[i][2][1]++;
498
                        }
499
                    }
500
                }
501
                break;
502
            default:
503
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
504
                return -1;
505
            }
506
        }
507

    
508
        s->mb_intra = 0;
509
        if (HAS_CBP(mb_type)) {
510
            s->dsp.clear_blocks(s->block[0]);
511

    
512
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
513
            if(mb_block_count > 6){
514
                 cbp<<= mb_block_count-6;
515
                 cbp |= get_bits(&s->gb, mb_block_count-6);
516
                 s->dsp.clear_blocks(s->block[6]);
517
            }
518
            if (cbp <= 0){
519
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
520
                return -1;
521
            }
522

    
523
#ifdef HAVE_XVMC
524
            //on 1 we memcpy blocks in xvmcvideo
525
            if(s->avctx->xvmc_acceleration > 1){
526
                XVMC_pack_pblocks(s,cbp);
527
                if(s->swap_uv){
528
                    exchange_uv(s);
529
                }
530
            }
531
#endif
532

    
533
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
534
                if(s->flags2 & CODEC_FLAG2_FAST){
535
                    for(i=0;i<6;i++) {
536
                        if(cbp & 32) {
537
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
538
                        } else {
539
                            s->block_last_index[i] = -1;
540
                        }
541
                        cbp+=cbp;
542
                    }
543
                }else{
544
                    cbp<<= 12-mb_block_count;
545

    
546
                    for(i=0;i<mb_block_count;i++) {
547
                        if ( cbp & (1<<11) ) {
548
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
549
                                return -1;
550
                        } else {
551
                            s->block_last_index[i] = -1;
552
                        }
553
                        cbp+=cbp;
554
                    }
555
                }
556
            } else {
557
                if(s->flags2 & CODEC_FLAG2_FAST){
558
                    for(i=0;i<6;i++) {
559
                        if (cbp & 32) {
560
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
561
                        } else {
562
                            s->block_last_index[i] = -1;
563
                        }
564
                        cbp+=cbp;
565
                    }
566
                }else{
567
                    for(i=0;i<6;i++) {
568
                        if (cbp & 32) {
569
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
570
                                return -1;
571
                        } else {
572
                            s->block_last_index[i] = -1;
573
                        }
574
                        cbp+=cbp;
575
                    }
576
                }
577
            }
578
        }else{
579
            for(i=0;i<12;i++)
580
                s->block_last_index[i] = -1;
581
        }
582
    }
583

    
584
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
585

    
586
    return 0;
587
}
588

    
589
/* as h263, but only 17 codes */
590
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
591
{
592
    int code, sign, val, l, shift;
593

    
594
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
595
    if (code == 0) {
596
        return pred;
597
    }
598
    if (code < 0) {
599
        return 0xffff;
600
    }
601

    
602
    sign = get_bits1(&s->gb);
603
    shift = fcode - 1;
604
    val = code;
605
    if (shift) {
606
        val = (val - 1) << shift;
607
        val |= get_bits(&s->gb, shift);
608
        val++;
609
    }
610
    if (sign)
611
        val = -val;
612
    val += pred;
613

    
614
    /* modulo decoding */
615
    l= INT_BIT - 5 - shift;
616
    val = (val<<l)>>l;
617
    return val;
618
}
619

    
620
static inline int decode_dc(GetBitContext *gb, int component)
621
{
622
    int code, diff;
623

    
624
    if (component == 0) {
625
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
626
    } else {
627
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
628
    }
629
    if (code < 0){
630
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
631
        return 0xffff;
632
    }
633
    if (code == 0) {
634
        diff = 0;
635
    } else {
636
        diff = get_xbits(gb, code);
637
    }
638
    return diff;
639
}
640

    
641
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
642
                               DCTELEM *block,
643
                               int n)
644
{
645
    int level, dc, diff, i, j, run;
646
    int component;
647
    RLTable *rl = &ff_rl_mpeg1;
648
    uint8_t * const scantable= s->intra_scantable.permutated;
649
    const uint16_t *quant_matrix= s->intra_matrix;
650
    const int qscale= s->qscale;
651

    
652
    /* DC coef */
653
    component = (n <= 3 ? 0 : n - 4 + 1);
654
    diff = decode_dc(&s->gb, component);
655
    if (diff >= 0xffff)
656
        return -1;
657
    dc = s->last_dc[component];
658
    dc += diff;
659
    s->last_dc[component] = dc;
660
    block[0] = dc<<3;
661
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
662
    i = 0;
663
    {
664
        OPEN_READER(re, &s->gb);
665
        /* now quantify & encode AC coefs */
666
        for(;;) {
667
            UPDATE_CACHE(re, &s->gb);
668
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
669

    
670
            if(level == 127){
671
                break;
672
            } else if(level != 0) {
673
                i += run;
674
                j = scantable[i];
675
                level= (level*qscale*quant_matrix[j])>>4;
676
                level= (level-1)|1;
677
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
678
                LAST_SKIP_BITS(re, &s->gb, 1);
679
            } else {
680
                /* escape */
681
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
682
                UPDATE_CACHE(re, &s->gb);
683
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
684
                if (level == -128) {
685
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
686
                } else if (level == 0) {
687
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
688
                }
689
                i += run;
690
                j = scantable[i];
691
                if(level<0){
692
                    level= -level;
693
                    level= (level*qscale*quant_matrix[j])>>4;
694
                    level= (level-1)|1;
695
                    level= -level;
696
                }else{
697
                    level= (level*qscale*quant_matrix[j])>>4;
698
                    level= (level-1)|1;
699
                }
700
            }
701
            if (i > 63){
702
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
703
                return -1;
704
            }
705

    
706
            block[j] = level;
707
        }
708
        CLOSE_READER(re, &s->gb);
709
    }
710
    s->block_last_index[n] = i;
711
   return 0;
712
}
713

    
714
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
715
                               DCTELEM *block,
716
                               int n)
717
{
718
    int level, i, j, run;
719
    RLTable *rl = &ff_rl_mpeg1;
720
    uint8_t * const scantable= s->intra_scantable.permutated;
721
    const uint16_t *quant_matrix= s->inter_matrix;
722
    const int qscale= s->qscale;
723

    
724
    {
725
        OPEN_READER(re, &s->gb);
726
        i = -1;
727
        /* special case for the first coef. no need to add a second vlc table */
728
        UPDATE_CACHE(re, &s->gb);
729
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
730
            level= (3*qscale*quant_matrix[0])>>5;
731
            level= (level-1)|1;
732
            if(GET_CACHE(re, &s->gb)&0x40000000)
733
                level= -level;
734
            block[0] = level;
735
            i++;
736
            SKIP_BITS(re, &s->gb, 2);
737
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
738
                goto end;
739
        }
740

    
741
        /* now quantify & encode AC coefs */
742
        for(;;) {
743
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
744

    
745
            if(level != 0) {
746
                i += run;
747
                j = scantable[i];
748
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
749
                level= (level-1)|1;
750
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
751
                SKIP_BITS(re, &s->gb, 1);
752
            } else {
753
                /* escape */
754
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
755
                UPDATE_CACHE(re, &s->gb);
756
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
757
                if (level == -128) {
758
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
759
                } else if (level == 0) {
760
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
761
                }
762
                i += run;
763
                j = scantable[i];
764
                if(level<0){
765
                    level= -level;
766
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
767
                    level= (level-1)|1;
768
                    level= -level;
769
                }else{
770
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
771
                    level= (level-1)|1;
772
                }
773
            }
774
            if (i > 63){
775
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
776
                return -1;
777
            }
778

    
779
            block[j] = level;
780
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
781
                break;
782
            UPDATE_CACHE(re, &s->gb);
783
        }
784
end:
785
        LAST_SKIP_BITS(re, &s->gb, 2);
786
        CLOSE_READER(re, &s->gb);
787
    }
788
    s->block_last_index[n] = i;
789
    return 0;
790
}
791

    
792
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
793
{
794
    int level, i, j, run;
795
    RLTable *rl = &ff_rl_mpeg1;
796
    uint8_t * const scantable= s->intra_scantable.permutated;
797
    const int qscale= s->qscale;
798

    
799
    {
800
        OPEN_READER(re, &s->gb);
801
        i = -1;
802
        /* special case for the first coef. no need to add a second vlc table */
803
        UPDATE_CACHE(re, &s->gb);
804
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
805
            level= (3*qscale)>>1;
806
            level= (level-1)|1;
807
            if(GET_CACHE(re, &s->gb)&0x40000000)
808
                level= -level;
809
            block[0] = level;
810
            i++;
811
            SKIP_BITS(re, &s->gb, 2);
812
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
813
                goto end;
814
        }
815

    
816
        /* now quantify & encode AC coefs */
817
        for(;;) {
818
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
819

    
820
            if(level != 0) {
821
                i += run;
822
                j = scantable[i];
823
                level= ((level*2+1)*qscale)>>1;
824
                level= (level-1)|1;
825
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
826
                SKIP_BITS(re, &s->gb, 1);
827
            } else {
828
                /* escape */
829
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
830
                UPDATE_CACHE(re, &s->gb);
831
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
832
                if (level == -128) {
833
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
834
                } else if (level == 0) {
835
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
836
                }
837
                i += run;
838
                j = scantable[i];
839
                if(level<0){
840
                    level= -level;
841
                    level= ((level*2+1)*qscale)>>1;
842
                    level= (level-1)|1;
843
                    level= -level;
844
                }else{
845
                    level= ((level*2+1)*qscale)>>1;
846
                    level= (level-1)|1;
847
                }
848
            }
849

    
850
            block[j] = level;
851
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
852
                break;
853
            UPDATE_CACHE(re, &s->gb);
854
        }
855
end:
856
        LAST_SKIP_BITS(re, &s->gb, 2);
857
        CLOSE_READER(re, &s->gb);
858
    }
859
    s->block_last_index[n] = i;
860
    return 0;
861
}
862

    
863

    
864
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
865
                               DCTELEM *block,
866
                               int n)
867
{
868
    int level, i, j, run;
869
    RLTable *rl = &ff_rl_mpeg1;
870
    uint8_t * const scantable= s->intra_scantable.permutated;
871
    const uint16_t *quant_matrix;
872
    const int qscale= s->qscale;
873
    int mismatch;
874

    
875
    mismatch = 1;
876

    
877
    {
878
        OPEN_READER(re, &s->gb);
879
        i = -1;
880
        if (n < 4)
881
            quant_matrix = s->inter_matrix;
882
        else
883
            quant_matrix = s->chroma_inter_matrix;
884

    
885
        /* special case for the first coef. no need to add a second vlc table */
886
        UPDATE_CACHE(re, &s->gb);
887
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
888
            level= (3*qscale*quant_matrix[0])>>5;
889
            if(GET_CACHE(re, &s->gb)&0x40000000)
890
                level= -level;
891
            block[0] = level;
892
            mismatch ^= level;
893
            i++;
894
            SKIP_BITS(re, &s->gb, 2);
895
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
896
                goto end;
897
        }
898

    
899
        /* now quantify & encode AC coefs */
900
        for(;;) {
901
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
902

    
903
            if(level != 0) {
904
                i += run;
905
                j = scantable[i];
906
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
907
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
908
                SKIP_BITS(re, &s->gb, 1);
909
            } else {
910
                /* escape */
911
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
912
                UPDATE_CACHE(re, &s->gb);
913
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
914

    
915
                i += run;
916
                j = scantable[i];
917
                if(level<0){
918
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
919
                    level= -level;
920
                }else{
921
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
922
                }
923
            }
924
            if (i > 63){
925
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
926
                return -1;
927
            }
928

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

    
941
    s->block_last_index[n] = i;
942
    return 0;
943
}
944

    
945
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
946
                               DCTELEM *block,
947
                               int n)
948
{
949
    int level, i, j, run;
950
    RLTable *rl = &ff_rl_mpeg1;
951
    uint8_t * const scantable= s->intra_scantable.permutated;
952
    const int qscale= s->qscale;
953
    OPEN_READER(re, &s->gb);
954
    i = -1;
955

    
956
    /* special case for the first coef. no need to add a second vlc table */
957
    UPDATE_CACHE(re, &s->gb);
958
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
959
        level= (3*qscale)>>1;
960
        if(GET_CACHE(re, &s->gb)&0x40000000)
961
            level= -level;
962
        block[0] = level;
963
        i++;
964
        SKIP_BITS(re, &s->gb, 2);
965
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
966
            goto end;
967
    }
968

    
969
    /* now quantify & encode AC coefs */
970
    for(;;) {
971
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
972

    
973
        if(level != 0) {
974
            i += run;
975
            j = scantable[i];
976
            level= ((level*2+1)*qscale)>>1;
977
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
978
            SKIP_BITS(re, &s->gb, 1);
979
        } else {
980
            /* escape */
981
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
982
            UPDATE_CACHE(re, &s->gb);
983
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
984

    
985
            i += run;
986
            j = scantable[i];
987
            if(level<0){
988
                level= ((-level*2+1)*qscale)>>1;
989
                level= -level;
990
            }else{
991
                level= ((level*2+1)*qscale)>>1;
992
            }
993
        }
994

    
995
        block[j] = level;
996
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
997
            break;
998
        UPDATE_CACHE(re, &s->gb);
999
    }
1000
end:
1001
    LAST_SKIP_BITS(re, &s->gb, 2);
1002
    CLOSE_READER(re, &s->gb);
1003
    s->block_last_index[n] = i;
1004
    return 0;
1005
}
1006

    
1007

    
1008
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1009
                               DCTELEM *block,
1010
                               int n)
1011
{
1012
    int level, dc, diff, i, j, run;
1013
    int component;
1014
    RLTable *rl;
1015
    uint8_t * const scantable= s->intra_scantable.permutated;
1016
    const uint16_t *quant_matrix;
1017
    const int qscale= s->qscale;
1018
    int mismatch;
1019

    
1020
    /* DC coef */
1021
    if (n < 4){
1022
        quant_matrix = s->intra_matrix;
1023
        component = 0;
1024
    }else{
1025
        quant_matrix = s->chroma_intra_matrix;
1026
        component = (n&1) + 1;
1027
    }
1028
    diff = decode_dc(&s->gb, component);
1029
    if (diff >= 0xffff)
1030
        return -1;
1031
    dc = s->last_dc[component];
1032
    dc += diff;
1033
    s->last_dc[component] = dc;
1034
    block[0] = dc << (3 - s->intra_dc_precision);
1035
    dprintf(s->avctx, "dc=%d\n", block[0]);
1036
    mismatch = block[0] ^ 1;
1037
    i = 0;
1038
    if (s->intra_vlc_format)
1039
        rl = &ff_rl_mpeg2;
1040
    else
1041
        rl = &ff_rl_mpeg1;
1042

    
1043
    {
1044
        OPEN_READER(re, &s->gb);
1045
        /* now quantify & encode AC coefs */
1046
        for(;;) {
1047
            UPDATE_CACHE(re, &s->gb);
1048
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1049

    
1050
            if(level == 127){
1051
                break;
1052
            } else if(level != 0) {
1053
                i += run;
1054
                j = scantable[i];
1055
                level= (level*qscale*quant_matrix[j])>>4;
1056
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1057
                LAST_SKIP_BITS(re, &s->gb, 1);
1058
            } else {
1059
                /* escape */
1060
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1061
                UPDATE_CACHE(re, &s->gb);
1062
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1063
                i += run;
1064
                j = scantable[i];
1065
                if(level<0){
1066
                    level= (-level*qscale*quant_matrix[j])>>4;
1067
                    level= -level;
1068
                }else{
1069
                    level= (level*qscale*quant_matrix[j])>>4;
1070
                }
1071
            }
1072
            if (i > 63){
1073
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1074
                return -1;
1075
            }
1076

    
1077
            mismatch^= level;
1078
            block[j] = level;
1079
        }
1080
        CLOSE_READER(re, &s->gb);
1081
    }
1082
    block[63]^= mismatch&1;
1083

    
1084
    s->block_last_index[n] = i;
1085
    return 0;
1086
}
1087

    
1088
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1089
                               DCTELEM *block,
1090
                               int n)
1091
{
1092
    int level, dc, diff, j, run;
1093
    int component;
1094
    RLTable *rl;
1095
    uint8_t * scantable= s->intra_scantable.permutated;
1096
    const uint16_t *quant_matrix;
1097
    const int qscale= s->qscale;
1098

    
1099
    /* DC coef */
1100
    if (n < 4){
1101
        quant_matrix = s->intra_matrix;
1102
        component = 0;
1103
    }else{
1104
        quant_matrix = s->chroma_intra_matrix;
1105
        component = (n&1) + 1;
1106
    }
1107
    diff = decode_dc(&s->gb, component);
1108
    if (diff >= 0xffff)
1109
        return -1;
1110
    dc = s->last_dc[component];
1111
    dc += diff;
1112
    s->last_dc[component] = dc;
1113
    block[0] = dc << (3 - s->intra_dc_precision);
1114
    if (s->intra_vlc_format)
1115
        rl = &ff_rl_mpeg2;
1116
    else
1117
        rl = &ff_rl_mpeg1;
1118

    
1119
    {
1120
        OPEN_READER(re, &s->gb);
1121
        /* now quantify & encode AC coefs */
1122
        for(;;) {
1123
            UPDATE_CACHE(re, &s->gb);
1124
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1125

    
1126
            if(level == 127){
1127
                break;
1128
            } else if(level != 0) {
1129
                scantable += run;
1130
                j = *scantable;
1131
                level= (level*qscale*quant_matrix[j])>>4;
1132
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1133
                LAST_SKIP_BITS(re, &s->gb, 1);
1134
            } else {
1135
                /* escape */
1136
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1137
                UPDATE_CACHE(re, &s->gb);
1138
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1139
                scantable += run;
1140
                j = *scantable;
1141
                if(level<0){
1142
                    level= (-level*qscale*quant_matrix[j])>>4;
1143
                    level= -level;
1144
                }else{
1145
                    level= (level*qscale*quant_matrix[j])>>4;
1146
                }
1147
            }
1148

    
1149
            block[j] = level;
1150
        }
1151
        CLOSE_READER(re, &s->gb);
1152
    }
1153

    
1154
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1155
    return 0;
1156
}
1157

    
1158
typedef struct Mpeg1Context {
1159
    MpegEncContext mpeg_enc_ctx;
1160
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1161
    int repeat_field; /* true if we must repeat the field */
1162
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1163
    int slice_count;
1164
    int swap_uv;//indicate VCR2
1165
    int save_aspect_info;
1166
    int save_width, save_height;
1167
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1168

    
1169
} Mpeg1Context;
1170

    
1171
static int mpeg_decode_init(AVCodecContext *avctx)
1172
{
1173
    Mpeg1Context *s = avctx->priv_data;
1174
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1175
    int i;
1176

    
1177
    //we need some parmutation to store
1178
    //matrixes, until MPV_common_init()
1179
    //set the real permutatuon
1180
    for(i=0;i<64;i++)
1181
       s2->dsp.idct_permutation[i]=i;
1182

    
1183
    MPV_decode_defaults(s2);
1184

    
1185
    s->mpeg_enc_ctx.avctx= avctx;
1186
    s->mpeg_enc_ctx.flags= avctx->flags;
1187
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1188
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1189
    init_vlcs();
1190

    
1191
    s->mpeg_enc_ctx_allocated = 0;
1192
    s->mpeg_enc_ctx.picture_number = 0;
1193
    s->repeat_field = 0;
1194
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1195
    return 0;
1196
}
1197

    
1198
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1199
                                     const uint8_t *new_perm){
1200
    uint16_t temp_matrix[64];
1201
    int i;
1202

    
1203
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1204

    
1205
    for(i=0;i<64;i++){
1206
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1207
    }
1208
}
1209

    
1210
//Call this function when we know all parameters
1211
//it may be called in different places for mpeg1 and mpeg2
1212
static int mpeg_decode_postinit(AVCodecContext *avctx){
1213
    Mpeg1Context *s1 = avctx->priv_data;
1214
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1215
    uint8_t old_permutation[64];
1216

    
1217
    if (
1218
        (s1->mpeg_enc_ctx_allocated == 0)||
1219
        avctx->coded_width  != s->width ||
1220
        avctx->coded_height != s->height||
1221
        s1->save_width != s->width ||
1222
        s1->save_height != s->height ||
1223
        s1->save_aspect_info != s->aspect_ratio_info||
1224
        0)
1225
    {
1226

    
1227
        if (s1->mpeg_enc_ctx_allocated) {
1228
            ParseContext pc= s->parse_context;
1229
            s->parse_context.buffer=0;
1230
            MPV_common_end(s);
1231
            s->parse_context= pc;
1232
        }
1233

    
1234
        if( (s->width == 0 )||(s->height == 0))
1235
            return -2;
1236

    
1237
        avcodec_set_dimensions(avctx, s->width, s->height);
1238
        avctx->bit_rate = s->bit_rate;
1239
        s1->save_aspect_info = s->aspect_ratio_info;
1240
        s1->save_width = s->width;
1241
        s1->save_height = s->height;
1242

    
1243
     //low_delay may be forced, in this case we will have B frames
1244
     //that behave like P frames
1245
        avctx->has_b_frames = !(s->low_delay);
1246

    
1247
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1248
            //mpeg1 fps
1249
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1250
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1251
            //mpeg1 aspect
1252
            avctx->sample_aspect_ratio= av_d2q(
1253
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1254

    
1255
        }else{//mpeg2
1256
        //mpeg2 fps
1257
            av_reduce(
1258
                &s->avctx->time_base.den,
1259
                &s->avctx->time_base.num,
1260
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1261
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1262
                1<<30);
1263
        //mpeg2 aspect
1264
            if(s->aspect_ratio_info > 1){
1265
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1266
                    s->avctx->sample_aspect_ratio=
1267
                        av_div_q(
1268
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1269
                         (AVRational){s->width, s->height}
1270
                         );
1271
                }else{
1272
                    s->avctx->sample_aspect_ratio=
1273
                        av_div_q(
1274
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1275
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1276
                        );
1277
                }
1278
            }else{
1279
                s->avctx->sample_aspect_ratio=
1280
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1281
            }
1282
        }//mpeg2
1283

    
1284
        if(avctx->xvmc_acceleration){
1285
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1286
        }else{
1287
            if(s->chroma_format <  2){
1288
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1289
            }else
1290
            if(s->chroma_format == 2){
1291
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1292
            }else
1293
            if(s->chroma_format >  2){
1294
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1295
            }
1296
        }
1297
        //until then pix_fmt may be changed right after codec init
1298
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1299
            if( avctx->idct_algo == FF_IDCT_AUTO )
1300
                avctx->idct_algo = FF_IDCT_SIMPLE;
1301

    
1302
        //quantization matrixes may need reordering
1303
        //if dct permutation is changed
1304
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1305

    
1306
        if (MPV_common_init(s) < 0)
1307
            return -2;
1308

    
1309
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1310
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1311
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1312
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1313

    
1314
        s1->mpeg_enc_ctx_allocated = 1;
1315
    }
1316
    return 0;
1317
}
1318

    
1319
static int mpeg1_decode_picture(AVCodecContext *avctx,
1320
                                const uint8_t *buf, int buf_size)
1321
{
1322
    Mpeg1Context *s1 = avctx->priv_data;
1323
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1324
    int ref, f_code, vbv_delay;
1325

    
1326
    if(mpeg_decode_postinit(s->avctx) < 0)
1327
       return -2;
1328

    
1329
    init_get_bits(&s->gb, buf, buf_size*8);
1330

    
1331
    ref = get_bits(&s->gb, 10); /* temporal ref */
1332
    s->pict_type = get_bits(&s->gb, 3);
1333
    if(s->pict_type == 0 || s->pict_type > 3)
1334
        return -1;
1335

    
1336
    vbv_delay= get_bits(&s->gb, 16);
1337
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1338
        s->full_pel[0] = get_bits1(&s->gb);
1339
        f_code = get_bits(&s->gb, 3);
1340
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1341
            return -1;
1342
        s->mpeg_f_code[0][0] = f_code;
1343
        s->mpeg_f_code[0][1] = f_code;
1344
    }
1345
    if (s->pict_type == B_TYPE) {
1346
        s->full_pel[1] = get_bits1(&s->gb);
1347
        f_code = get_bits(&s->gb, 3);
1348
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1349
            return -1;
1350
        s->mpeg_f_code[1][0] = f_code;
1351
        s->mpeg_f_code[1][1] = f_code;
1352
    }
1353
    s->current_picture.pict_type= s->pict_type;
1354
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1355

    
1356
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1357
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1358

    
1359
    s->y_dc_scale = 8;
1360
    s->c_dc_scale = 8;
1361
    s->first_slice = 1;
1362
    return 0;
1363
}
1364

    
1365
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1366
{
1367
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1368
    int horiz_size_ext, vert_size_ext;
1369
    int bit_rate_ext;
1370

    
1371
    skip_bits(&s->gb, 1); /* profil and level esc*/
1372
    s->avctx->profile= get_bits(&s->gb, 3);
1373
    s->avctx->level= get_bits(&s->gb, 4);
1374
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1375
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1376
    horiz_size_ext = get_bits(&s->gb, 2);
1377
    vert_size_ext = get_bits(&s->gb, 2);
1378
    s->width |= (horiz_size_ext << 12);
1379
    s->height |= (vert_size_ext << 12);
1380
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1381
    s->bit_rate += (bit_rate_ext << 18) * 400;
1382
    skip_bits1(&s->gb); /* marker */
1383
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1384

    
1385
    s->low_delay = get_bits1(&s->gb);
1386
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1387

    
1388
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1389
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1390

    
1391
    dprintf(s->avctx, "sequence extension\n");
1392
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1393
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1394

    
1395
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1396
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1397
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1398

    
1399
}
1400

    
1401
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1402
{
1403
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1404
    int color_description, w, h;
1405

    
1406
    skip_bits(&s->gb, 3); /* video format */
1407
    color_description= get_bits1(&s->gb);
1408
    if(color_description){
1409
        skip_bits(&s->gb, 8); /* color primaries */
1410
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1411
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1412
    }
1413
    w= get_bits(&s->gb, 14);
1414
    skip_bits(&s->gb, 1); //marker
1415
    h= get_bits(&s->gb, 14);
1416
    skip_bits(&s->gb, 1); //marker
1417

    
1418
    s1->pan_scan.width= 16*w;
1419
    s1->pan_scan.height=16*h;
1420

    
1421
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1422
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1423
}
1424

    
1425
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1426
{
1427
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1428
    int i,nofco;
1429

    
1430
    nofco = 1;
1431
    if(s->progressive_sequence){
1432
        if(s->repeat_first_field){
1433
            nofco++;
1434
            if(s->top_field_first)
1435
                nofco++;
1436
        }
1437
    }else{
1438
        if(s->picture_structure == PICT_FRAME){
1439
            nofco++;
1440
            if(s->repeat_first_field)
1441
                nofco++;
1442
        }
1443
    }
1444
    for(i=0; i<nofco; i++){
1445
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1446
        skip_bits(&s->gb, 1); //marker
1447
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1448
        skip_bits(&s->gb, 1); //marker
1449
    }
1450

    
1451
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1452
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1453
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1454
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1455
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1456
        );
1457
}
1458

    
1459
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1460
{
1461
    int i, v, j;
1462

    
1463
    dprintf(s->avctx, "matrix extension\n");
1464

    
1465
    if (get_bits1(&s->gb)) {
1466
        for(i=0;i<64;i++) {
1467
            v = get_bits(&s->gb, 8);
1468
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1469
            s->intra_matrix[j] = v;
1470
            s->chroma_intra_matrix[j] = v;
1471
        }
1472
    }
1473
    if (get_bits1(&s->gb)) {
1474
        for(i=0;i<64;i++) {
1475
            v = get_bits(&s->gb, 8);
1476
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1477
            s->inter_matrix[j] = v;
1478
            s->chroma_inter_matrix[j] = v;
1479
        }
1480
    }
1481
    if (get_bits1(&s->gb)) {
1482
        for(i=0;i<64;i++) {
1483
            v = get_bits(&s->gb, 8);
1484
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1485
            s->chroma_intra_matrix[j] = v;
1486
        }
1487
    }
1488
    if (get_bits1(&s->gb)) {
1489
        for(i=0;i<64;i++) {
1490
            v = get_bits(&s->gb, 8);
1491
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1492
            s->chroma_inter_matrix[j] = v;
1493
        }
1494
    }
1495
}
1496

    
1497
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1498
{
1499
    s->full_pel[0] = s->full_pel[1] = 0;
1500
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1501
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1502
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1503
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1504
    s->intra_dc_precision = get_bits(&s->gb, 2);
1505
    s->picture_structure = get_bits(&s->gb, 2);
1506
    s->top_field_first = get_bits1(&s->gb);
1507
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1508
    s->concealment_motion_vectors = get_bits1(&s->gb);
1509
    s->q_scale_type = get_bits1(&s->gb);
1510
    s->intra_vlc_format = get_bits1(&s->gb);
1511
    s->alternate_scan = get_bits1(&s->gb);
1512
    s->repeat_first_field = get_bits1(&s->gb);
1513
    s->chroma_420_type = get_bits1(&s->gb);
1514
    s->progressive_frame = get_bits1(&s->gb);
1515

    
1516
    if(s->picture_structure == PICT_FRAME){
1517
        s->first_field=0;
1518
        s->v_edge_pos= 16*s->mb_height;
1519
    }else{
1520
        s->first_field ^= 1;
1521
        s->v_edge_pos=  8*s->mb_height;
1522
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1523
    }
1524

    
1525
    if(s->alternate_scan){
1526
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1527
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1528
    }else{
1529
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1530
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1531
    }
1532

    
1533
    /* composite display not parsed */
1534
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1535
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1536
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1537
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1538
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1539
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1540
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1541
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1542
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1543
}
1544

    
1545
static void mpeg_decode_extension(AVCodecContext *avctx,
1546
                                  const uint8_t *buf, int buf_size)
1547
{
1548
    Mpeg1Context *s1 = avctx->priv_data;
1549
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1550
    int ext_type;
1551

    
1552
    init_get_bits(&s->gb, buf, buf_size*8);
1553

    
1554
    ext_type = get_bits(&s->gb, 4);
1555
    switch(ext_type) {
1556
    case 0x1:
1557
        mpeg_decode_sequence_extension(s1);
1558
        break;
1559
    case 0x2:
1560
        mpeg_decode_sequence_display_extension(s1);
1561
        break;
1562
    case 0x3:
1563
        mpeg_decode_quant_matrix_extension(s);
1564
        break;
1565
    case 0x7:
1566
        mpeg_decode_picture_display_extension(s1);
1567
        break;
1568
    case 0x8:
1569
        mpeg_decode_picture_coding_extension(s);
1570
        break;
1571
    }
1572
}
1573

    
1574
static void exchange_uv(MpegEncContext *s){
1575
    short * tmp = s->pblocks[4];
1576
    s->pblocks[4] = s->pblocks[5];
1577
    s->pblocks[5] = tmp;
1578
}
1579

    
1580
static int mpeg_field_start(MpegEncContext *s){
1581
    AVCodecContext *avctx= s->avctx;
1582
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1583

    
1584
    /* start frame decoding */
1585
    if(s->first_field || s->picture_structure==PICT_FRAME){
1586
        if(MPV_frame_start(s, avctx) < 0)
1587
            return -1;
1588

    
1589
        ff_er_frame_start(s);
1590

    
1591
        /* first check if we must repeat the frame */
1592
        s->current_picture_ptr->repeat_pict = 0;
1593
        if (s->repeat_first_field) {
1594
            if (s->progressive_sequence) {
1595
                if (s->top_field_first)
1596
                    s->current_picture_ptr->repeat_pict = 4;
1597
                else
1598
                    s->current_picture_ptr->repeat_pict = 2;
1599
            } else if (s->progressive_frame) {
1600
                s->current_picture_ptr->repeat_pict = 1;
1601
            }
1602
        }
1603

    
1604
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1605
    }else{ //second field
1606
            int i;
1607

    
1608
            if(!s->current_picture_ptr){
1609
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1610
                return -1;
1611
            }
1612

    
1613
            for(i=0; i<4; i++){
1614
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1615
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1616
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1617
                }
1618
            }
1619
    }
1620
#ifdef HAVE_XVMC
1621
// MPV_frame_start will call this function too,
1622
// but we need to call it on every field
1623
    if(s->avctx->xvmc_acceleration)
1624
         XVMC_field_start(s,avctx);
1625
#endif
1626

    
1627
    return 0;
1628
}
1629

    
1630
#define DECODE_SLICE_ERROR -1
1631
#define DECODE_SLICE_OK 0
1632

    
1633
/**
1634
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1635
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1636
 *         DECODE_SLICE_OK if this slice is ok<br>
1637
 */
1638
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1639
                             const uint8_t **buf, int buf_size)
1640
{
1641
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1642
    AVCodecContext *avctx= s->avctx;
1643
    const int field_pic= s->picture_structure != PICT_FRAME;
1644
    const int lowres= s->avctx->lowres;
1645

    
1646
    s->resync_mb_x=
1647
    s->resync_mb_y= -1;
1648

    
1649
    if (mb_y<<field_pic >= s->mb_height){
1650
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1651
        return -1;
1652
    }
1653

    
1654
    init_get_bits(&s->gb, *buf, buf_size*8);
1655

    
1656
    ff_mpeg1_clean_buffers(s);
1657
    s->interlaced_dct = 0;
1658

    
1659
    s->qscale = get_qscale(s);
1660

    
1661
    if(s->qscale == 0){
1662
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1663
        return -1;
1664
    }
1665

    
1666
    /* extra slice info */
1667
    while (get_bits1(&s->gb) != 0) {
1668
        skip_bits(&s->gb, 8);
1669
    }
1670

    
1671
    s->mb_x=0;
1672

    
1673
    for(;;) {
1674
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1675
        if (code < 0){
1676
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1677
            return -1;
1678
        }
1679
        if (code >= 33) {
1680
            if (code == 33) {
1681
                s->mb_x += 33;
1682
            }
1683
            /* otherwise, stuffing, nothing to do */
1684
        } else {
1685
            s->mb_x += code;
1686
            break;
1687
        }
1688
    }
1689
    if(s->mb_x >= (unsigned)s->mb_width){
1690
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1691
        return -1;
1692
    }
1693

    
1694
    s->resync_mb_x= s->mb_x;
1695
    s->resync_mb_y= s->mb_y= mb_y;
1696
    s->mb_skip_run= 0;
1697
    ff_init_block_index(s);
1698

    
1699
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1700
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1701
             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",
1702
                 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],
1703
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1704
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1705
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1706
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1707
        }
1708
    }
1709

    
1710
    for(;;) {
1711
#ifdef HAVE_XVMC
1712
        //one 1 we memcpy blocks in xvmcvideo
1713
        if(s->avctx->xvmc_acceleration > 1)
1714
            XVMC_init_block(s);//set s->block
1715
#endif
1716

    
1717
        if(mpeg_decode_mb(s, s->block) < 0)
1718
            return -1;
1719

    
1720
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1721
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1722
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1723
            int motion_x, motion_y, dir, i;
1724
            if(field_pic && !s->first_field)
1725
                xy += wrap/2;
1726

    
1727
            for(i=0; i<2; i++){
1728
                for(dir=0; dir<2; dir++){
1729
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1730
                        motion_x = motion_y = 0;
1731
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1732
                        motion_x = s->mv[dir][0][0];
1733
                        motion_y = s->mv[dir][0][1];
1734
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1735
                        motion_x = s->mv[dir][i][0];
1736
                        motion_y = s->mv[dir][i][1];
1737
                    }
1738

    
1739
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1740
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1741
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1742
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1743
                    s->current_picture.ref_index [dir][xy    ]=
1744
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1745
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1746
                }
1747
                xy += wrap;
1748
            }
1749
        }
1750

    
1751
        s->dest[0] += 16 >> lowres;
1752
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1753
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1754

    
1755
        MPV_decode_mb(s, s->block);
1756

    
1757
        if (++s->mb_x >= s->mb_width) {
1758
            const int mb_size= 16>>s->avctx->lowres;
1759

    
1760
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1761

    
1762
            s->mb_x = 0;
1763
            s->mb_y++;
1764

    
1765
            if(s->mb_y<<field_pic >= s->mb_height){
1766
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1767
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1768
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1769
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1770

    
1771
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1772
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1773
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1774
                    return -1;
1775
                }else
1776
                    goto eos;
1777
            }
1778

    
1779
            ff_init_block_index(s);
1780
        }
1781

    
1782
        /* skip mb handling */
1783
        if (s->mb_skip_run == -1) {
1784
            /* read again increment */
1785
            s->mb_skip_run = 0;
1786
            for(;;) {
1787
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1788
                if (code < 0){
1789
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1790
                    return -1;
1791
                }
1792
                if (code >= 33) {
1793
                    if (code == 33) {
1794
                        s->mb_skip_run += 33;
1795
                    }else if(code == 35){
1796
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1797
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1798
                            return -1;
1799
                        }
1800
                        goto eos; /* end of slice */
1801
                    }
1802
                    /* otherwise, stuffing, nothing to do */
1803
                } else {
1804
                    s->mb_skip_run += code;
1805
                    break;
1806
                }
1807
            }
1808
            if(s->mb_skip_run){
1809
                int i;
1810
                if(s->pict_type == I_TYPE){
1811
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1812
                    return -1;
1813
                }
1814

    
1815
                /* skip mb */
1816
                s->mb_intra = 0;
1817
                for(i=0;i<12;i++)
1818
                    s->block_last_index[i] = -1;
1819
                if(s->picture_structure == PICT_FRAME)
1820
                    s->mv_type = MV_TYPE_16X16;
1821
                else
1822
                    s->mv_type = MV_TYPE_FIELD;
1823
                if (s->pict_type == P_TYPE) {
1824
                    /* if P type, zero motion vector is implied */
1825
                    s->mv_dir = MV_DIR_FORWARD;
1826
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1827
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1828
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1829
                    s->field_select[0][0]= s->picture_structure - 1;
1830
                } else {
1831
                    /* if B type, reuse previous vectors and directions */
1832
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1833
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1834
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1835
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1836
                }
1837
            }
1838
        }
1839
    }
1840
eos: // end of slice
1841
    *buf += get_bits_count(&s->gb)/8 - 1;
1842
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1843
    return 0;
1844
}
1845

    
1846
static int slice_decode_thread(AVCodecContext *c, void *arg){
1847
    MpegEncContext *s= arg;
1848
    const uint8_t *buf= s->gb.buffer;
1849
    int mb_y= s->start_mb_y;
1850

    
1851
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1852

    
1853
    for(;;){
1854
        uint32_t start_code;
1855
        int ret;
1856

    
1857
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1858
        emms_c();
1859
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1860
//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);
1861
        if(ret < 0){
1862
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1863
                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);
1864
        }else{
1865
            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);
1866
        }
1867

    
1868
        if(s->mb_y == s->end_mb_y)
1869
            return 0;
1870

    
1871
        start_code= -1;
1872
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1873
        mb_y= start_code - SLICE_MIN_START_CODE;
1874
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1875
            return -1;
1876
    }
1877

    
1878
    return 0; //not reached
1879
}
1880

    
1881
/**
1882
 * handles slice ends.
1883
 * @return 1 if it seems to be the last slice of
1884
 */
1885
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1886
{
1887
    Mpeg1Context *s1 = avctx->priv_data;
1888
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1889

    
1890
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1891
        return 0;
1892

    
1893
#ifdef HAVE_XVMC
1894
    if(s->avctx->xvmc_acceleration)
1895
        XVMC_field_end(s);
1896
#endif
1897
    /* end of slice reached */
1898
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1899
        /* end of image */
1900

    
1901
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1902

    
1903
        ff_er_frame_end(s);
1904

    
1905
        MPV_frame_end(s);
1906

    
1907
        if (s->pict_type == B_TYPE || s->low_delay) {
1908
            *pict= *(AVFrame*)s->current_picture_ptr;
1909
            ff_print_debug_info(s, pict);
1910
        } else {
1911
            s->picture_number++;
1912
            /* latency of 1 frame for I and P frames */
1913
            /* XXX: use another variable than picture_number */
1914
            if (s->last_picture_ptr != NULL) {
1915
                *pict= *(AVFrame*)s->last_picture_ptr;
1916
                 ff_print_debug_info(s, pict);
1917
            }
1918
        }
1919

    
1920
        return 1;
1921
    } else {
1922
        return 0;
1923
    }
1924
}
1925

    
1926
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1927
                                 const uint8_t *buf, int buf_size)
1928
{
1929
    Mpeg1Context *s1 = avctx->priv_data;
1930
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1931
    int width,height;
1932
    int i, v, j;
1933

    
1934
    init_get_bits(&s->gb, buf, buf_size*8);
1935

    
1936
    width = get_bits(&s->gb, 12);
1937
    height = get_bits(&s->gb, 12);
1938
    if (width <= 0 || height <= 0 ||
1939
        (width % 2) != 0 || (height % 2) != 0)
1940
        return -1;
1941
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1942
    if (s->aspect_ratio_info == 0)
1943
        return -1;
1944
    s->frame_rate_index = get_bits(&s->gb, 4);
1945
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1946
        return -1;
1947
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1948
    if (get_bits1(&s->gb) == 0) /* marker */
1949
        return -1;
1950
    s->width = width;
1951
    s->height = height;
1952

    
1953
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1954
    skip_bits(&s->gb, 1);
1955

    
1956
    /* get matrix */
1957
    if (get_bits1(&s->gb)) {
1958
        for(i=0;i<64;i++) {
1959
            v = get_bits(&s->gb, 8);
1960
            if(v==0){
1961
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1962
                return -1;
1963
            }
1964
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1965
            s->intra_matrix[j] = v;
1966
            s->chroma_intra_matrix[j] = v;
1967
        }
1968
#ifdef DEBUG
1969
        dprintf(s->avctx, "intra matrix present\n");
1970
        for(i=0;i<64;i++)
1971
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1972
        dprintf(s->avctx, "\n");
1973
#endif
1974
    } else {
1975
        for(i=0;i<64;i++) {
1976
            j = s->dsp.idct_permutation[i];
1977
            v = ff_mpeg1_default_intra_matrix[i];
1978
            s->intra_matrix[j] = v;
1979
            s->chroma_intra_matrix[j] = v;
1980
        }
1981
    }
1982
    if (get_bits1(&s->gb)) {
1983
        for(i=0;i<64;i++) {
1984
            v = get_bits(&s->gb, 8);
1985
            if(v==0){
1986
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1987
                return -1;
1988
            }
1989
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1990
            s->inter_matrix[j] = v;
1991
            s->chroma_inter_matrix[j] = v;
1992
        }
1993
#ifdef DEBUG
1994
        dprintf(s->avctx, "non intra matrix present\n");
1995
        for(i=0;i<64;i++)
1996
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1997
        dprintf(s->avctx, "\n");
1998
#endif
1999
    } else {
2000
        for(i=0;i<64;i++) {
2001
            int j= s->dsp.idct_permutation[i];
2002
            v = ff_mpeg1_default_non_intra_matrix[i];
2003
            s->inter_matrix[j] = v;
2004
            s->chroma_inter_matrix[j] = v;
2005
        }
2006
    }
2007

    
2008
    if(show_bits(&s->gb, 23) != 0){
2009
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2010
        return -1;
2011
    }
2012

    
2013
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2014
    s->progressive_sequence = 1;
2015
    s->progressive_frame = 1;
2016
    s->picture_structure = PICT_FRAME;
2017
    s->frame_pred_frame_dct = 1;
2018
    s->chroma_format = 1;
2019
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2020
    avctx->sub_id = 1; /* indicates mpeg1 */
2021
    s->out_format = FMT_MPEG1;
2022
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2023
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2024

    
2025
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2026
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2027
               s->avctx->rc_buffer_size, s->bit_rate);
2028

    
2029
    return 0;
2030
}
2031

    
2032
static int vcr2_init_sequence(AVCodecContext *avctx)
2033
{
2034
    Mpeg1Context *s1 = avctx->priv_data;
2035
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2036
    int i, v;
2037

    
2038
    /* start new mpeg1 context decoding */
2039
    s->out_format = FMT_MPEG1;
2040
    if (s1->mpeg_enc_ctx_allocated) {
2041
        MPV_common_end(s);
2042
    }
2043
    s->width  = avctx->coded_width;
2044
    s->height = avctx->coded_height;
2045
    avctx->has_b_frames= 0; //true?
2046
    s->low_delay= 1;
2047

    
2048
    if(avctx->xvmc_acceleration){
2049
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2050
    }else{
2051
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2052
    }
2053

    
2054
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2055
        if( avctx->idct_algo == FF_IDCT_AUTO )
2056
            avctx->idct_algo = FF_IDCT_SIMPLE;
2057

    
2058
    if (MPV_common_init(s) < 0)
2059
        return -1;
2060
    exchange_uv(s);//common init reset pblocks, so we swap them here
2061
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2062
    s1->mpeg_enc_ctx_allocated = 1;
2063

    
2064
    for(i=0;i<64;i++) {
2065
        int j= s->dsp.idct_permutation[i];
2066
        v = ff_mpeg1_default_intra_matrix[i];
2067
        s->intra_matrix[j] = v;
2068
        s->chroma_intra_matrix[j] = v;
2069

    
2070
        v = ff_mpeg1_default_non_intra_matrix[i];
2071
        s->inter_matrix[j] = v;
2072
        s->chroma_inter_matrix[j] = v;
2073
    }
2074

    
2075
    s->progressive_sequence = 1;
2076
    s->progressive_frame = 1;
2077
    s->picture_structure = PICT_FRAME;
2078
    s->frame_pred_frame_dct = 1;
2079
    s->chroma_format = 1;
2080
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2081
    avctx->sub_id = 2; /* indicates mpeg2 */
2082
    return 0;
2083
}
2084

    
2085

    
2086
static void mpeg_decode_user_data(AVCodecContext *avctx,
2087
                                  const uint8_t *buf, int buf_size)
2088
{
2089
    const uint8_t *p;
2090
    int len, flags;
2091
    p = buf;
2092
    len = buf_size;
2093

    
2094
    /* we parse the DTG active format information */
2095
    if (len >= 5 &&
2096
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2097
        flags = p[4];
2098
        p += 5;
2099
        len -= 5;
2100
        if (flags & 0x80) {
2101
            /* skip event id */
2102
            if (len < 2)
2103
                return;
2104
            p += 2;
2105
            len -= 2;
2106
        }
2107
        if (flags & 0x40) {
2108
            if (len < 1)
2109
                return;
2110
            avctx->dtg_active_format = p[0] & 0x0f;
2111
        }
2112
    }
2113
}
2114

    
2115
static void mpeg_decode_gop(AVCodecContext *avctx,
2116
                            const uint8_t *buf, int buf_size){
2117
    Mpeg1Context *s1 = avctx->priv_data;
2118
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2119

    
2120
    int drop_frame_flag;
2121
    int time_code_hours, time_code_minutes;
2122
    int time_code_seconds, time_code_pictures;
2123
    int broken_link;
2124

    
2125
    init_get_bits(&s->gb, buf, buf_size*8);
2126

    
2127
    drop_frame_flag = get_bits1(&s->gb);
2128

    
2129
    time_code_hours=get_bits(&s->gb,5);
2130
    time_code_minutes = get_bits(&s->gb,6);
2131
    skip_bits1(&s->gb);//marker bit
2132
    time_code_seconds = get_bits(&s->gb,6);
2133
    time_code_pictures = get_bits(&s->gb,6);
2134

    
2135
    /*broken_link indicate that after editing the
2136
      reference frames of the first B-Frames after GOP I-Frame
2137
      are missing (open gop)*/
2138
    broken_link = get_bits1(&s->gb);
2139

    
2140
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2141
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2142
            time_code_hours, time_code_minutes, time_code_seconds,
2143
            time_code_pictures, broken_link);
2144
}
2145
/**
2146
 * finds the end of the current frame in the bitstream.
2147
 * @return the position of the first byte of the next frame, or -1
2148
 */
2149
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2150
{
2151
    int i;
2152
    uint32_t state= pc->state;
2153

    
2154
    i=0;
2155
    if(!pc->frame_start_found){
2156
        for(i=0; i<buf_size; i++){
2157
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2158
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2159
                i++;
2160
                pc->frame_start_found=1;
2161
                break;
2162
            }
2163
        }
2164
    }
2165

    
2166
    if(pc->frame_start_found){
2167
        /* EOF considered as end of frame */
2168
        if (buf_size == 0)
2169
            return 0;
2170
        for(; i<buf_size; i++){
2171
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2172
            if((state&0xFFFFFF00) == 0x100){
2173
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2174
                    pc->frame_start_found=0;
2175
                    pc->state=-1;
2176
                    return i-3;
2177
                }
2178
            }
2179
        }
2180
    }
2181
    pc->state= state;
2182
    return END_NOT_FOUND;
2183
}
2184

    
2185
/* handle buffering and image synchronisation */
2186
static int mpeg_decode_frame(AVCodecContext *avctx,
2187
                             void *data, int *data_size,
2188
                             uint8_t *buf, int buf_size)
2189
{
2190
    Mpeg1Context *s = avctx->priv_data;
2191
    const uint8_t *buf_end;
2192
    const uint8_t *buf_ptr;
2193
    uint32_t start_code;
2194
    int ret, input_size;
2195
    AVFrame *picture = data;
2196
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2197
    dprintf(avctx, "fill_buffer\n");
2198

    
2199
    if (buf_size == 0) {
2200
        /* special case for last picture */
2201
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2202
            *picture= *(AVFrame*)s2->next_picture_ptr;
2203
            s2->next_picture_ptr= NULL;
2204

    
2205
            *data_size = sizeof(AVFrame);
2206
        }
2207
        return 0;
2208
    }
2209

    
2210
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2211
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2212

    
2213
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2214
            return buf_size;
2215
    }
2216

    
2217
    buf_ptr = buf;
2218
    buf_end = buf + buf_size;
2219

    
2220
#if 0
2221
    if (s->repeat_field % 2 == 1) {
2222
        s->repeat_field++;
2223
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2224
        //        s2->picture_number, s->repeat_field);
2225
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2226
            *data_size = sizeof(AVPicture);
2227
            goto the_end;
2228
        }
2229
    }
2230
#endif
2231

    
2232
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2233
        vcr2_init_sequence(avctx);
2234

    
2235
    s->slice_count= 0;
2236

    
2237
    for(;;) {
2238
        /* find start next code */
2239
        start_code = -1;
2240
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2241
        if (start_code > 0x1ff){
2242
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2243
                if(avctx->thread_count > 1){
2244
                    int i;
2245

    
2246
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2247
                    for(i=0; i<s->slice_count; i++)
2248
                        s2->error_count += s2->thread_context[i]->error_count;
2249
                }
2250
                if (slice_end(avctx, picture)) {
2251
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2252
                        *data_size = sizeof(AVPicture);
2253
                }
2254
            }
2255
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2256
        }
2257

    
2258
        input_size = buf_end - buf_ptr;
2259

    
2260
        if(avctx->debug & FF_DEBUG_STARTCODE){
2261
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2262
        }
2263

    
2264
        /* prepare data for next start code */
2265
        switch(start_code) {
2266
        case SEQ_START_CODE:
2267
            mpeg1_decode_sequence(avctx, buf_ptr,
2268
                                    input_size);
2269
            break;
2270

    
2271
        case PICTURE_START_CODE:
2272
            /* we have a complete image : we try to decompress it */
2273
            mpeg1_decode_picture(avctx,
2274
                                    buf_ptr, input_size);
2275
            break;
2276
        case EXT_START_CODE:
2277
            mpeg_decode_extension(avctx,
2278
                                    buf_ptr, input_size);
2279
            break;
2280
        case USER_START_CODE:
2281
            mpeg_decode_user_data(avctx,
2282
                                    buf_ptr, input_size);
2283
            break;
2284
        case GOP_START_CODE:
2285
            s2->first_field=0;
2286
            mpeg_decode_gop(avctx,
2287
                                    buf_ptr, input_size);
2288
            break;
2289
        default:
2290
            if (start_code >= SLICE_MIN_START_CODE &&
2291
                start_code <= SLICE_MAX_START_CODE) {
2292
                int mb_y= start_code - SLICE_MIN_START_CODE;
2293

    
2294
                if(s2->last_picture_ptr==NULL){
2295
                /* Skip B-frames if we do not have reference frames. */
2296
                    if(s2->pict_type==B_TYPE) break;
2297
                /* Skip P-frames if we do not have reference frame no valid header. */
2298
//                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2299
                }
2300
                /* Skip B-frames if we are in a hurry. */
2301
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2302
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2303
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2304
                    || avctx->skip_frame >= AVDISCARD_ALL)
2305
                    break;
2306
                /* Skip everything if we are in a hurry>=5. */
2307
                if(avctx->hurry_up>=5) break;
2308

    
2309
                if (!s->mpeg_enc_ctx_allocated) break;
2310

    
2311
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2312
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2313
                        break;
2314
                }
2315

    
2316
                if(s2->first_slice){
2317
                    s2->first_slice=0;
2318
                            if(mpeg_field_start(s2) < 0)
2319
                        return -1;
2320
                    }
2321
                if(!s2->current_picture_ptr){
2322
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2323
                    return -1;
2324
                }
2325

    
2326
                if(avctx->thread_count > 1){
2327
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2328
                    if(threshold <= mb_y){
2329
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2330

    
2331
                        thread_context->start_mb_y= mb_y;
2332
                        thread_context->end_mb_y  = s2->mb_height;
2333
                        if(s->slice_count){
2334
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2335
                            ff_update_duplicate_context(thread_context, s2);
2336
                        }
2337
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2338
                        s->slice_count++;
2339
                    }
2340
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
2341
                }else{
2342
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2343
                    emms_c();
2344

    
2345
                    if(ret < 0){
2346
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2347
                            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);
2348
                    }else{
2349
                        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);
2350
                    }
2351
                }
2352
            }
2353
            break;
2354
        }
2355
    }
2356
}
2357

    
2358
static int mpeg_decode_end(AVCodecContext *avctx)
2359
{
2360
    Mpeg1Context *s = avctx->priv_data;
2361

    
2362
    if (s->mpeg_enc_ctx_allocated)
2363
        MPV_common_end(&s->mpeg_enc_ctx);
2364
    return 0;
2365
}
2366

    
2367
AVCodec mpeg1video_decoder = {
2368
    "mpeg1video",
2369
    CODEC_TYPE_VIDEO,
2370
    CODEC_ID_MPEG1VIDEO,
2371
    sizeof(Mpeg1Context),
2372
    mpeg_decode_init,
2373
    NULL,
2374
    mpeg_decode_end,
2375
    mpeg_decode_frame,
2376
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2377
    .flush= ff_mpeg_flush,
2378
};
2379

    
2380
AVCodec mpeg2video_decoder = {
2381
    "mpeg2video",
2382
    CODEC_TYPE_VIDEO,
2383
    CODEC_ID_MPEG2VIDEO,
2384
    sizeof(Mpeg1Context),
2385
    mpeg_decode_init,
2386
    NULL,
2387
    mpeg_decode_end,
2388
    mpeg_decode_frame,
2389
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2390
    .flush= ff_mpeg_flush,
2391
};
2392

    
2393
//legacy decoder
2394
AVCodec mpegvideo_decoder = {
2395
    "mpegvideo",
2396
    CODEC_TYPE_VIDEO,
2397
    CODEC_ID_MPEG2VIDEO,
2398
    sizeof(Mpeg1Context),
2399
    mpeg_decode_init,
2400
    NULL,
2401
    mpeg_decode_end,
2402
    mpeg_decode_frame,
2403
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2404
    .flush= ff_mpeg_flush,
2405
};
2406

    
2407
#ifdef HAVE_XVMC
2408
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2409
    Mpeg1Context *s;
2410

    
2411
    if( avctx->thread_count > 1)
2412
        return -1;
2413
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2414
        return -1;
2415
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2416
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2417
    }
2418
    mpeg_decode_init(avctx);
2419
    s = avctx->priv_data;
2420

    
2421
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2422
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2423

    
2424
    return 0;
2425
}
2426

    
2427
AVCodec mpeg_xvmc_decoder = {
2428
    "mpegvideo_xvmc",
2429
    CODEC_TYPE_VIDEO,
2430
    CODEC_ID_MPEG2VIDEO_XVMC,
2431
    sizeof(Mpeg1Context),
2432
    mpeg_mc_decode_init,
2433
    NULL,
2434
    mpeg_decode_end,
2435
    mpeg_decode_frame,
2436
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2437
    .flush= ff_mpeg_flush,
2438
};
2439

    
2440
#endif
2441

    
2442
/* this is ugly i know, but the alternative is too make
2443
   hundreds of vars global and prefix them with ff_mpeg1_
2444
   which is far uglier. */
2445
#include "mdec.c"