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ffmpeg / libavcodec / mpeg12.c @ 2952d13a

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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,
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                                        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,
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                                           PIX_FMT_XVMC_MPEG2_MC,
79
                                           -1};
80

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

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

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

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

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

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

    
125
void ff_mpeg12_common_init(MpegEncContext *s)
126
{
127

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

    
131
}
132

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

    
140

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
230
            if(s->mb_x)
231
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
232
            else
233
                mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
234
            if(IS_INTRA(mb_type))
235
                return -1;
236

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

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

    
245
        return 0;
246
    }
247

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

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

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

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

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

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

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

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

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

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

    
355
            s->last_mv[0][0][0] = 0;
356
            s->last_mv[0][0][1] = 0;
357
            s->last_mv[0][1][0] = 0;
358
            s->last_mv[0][1][1] = 0;
359
            s->mv[0][0][0] = 0;
360
            s->mv[0][0][1] = 0;
361
        }else{
362
            assert(mb_type & MB_TYPE_L0L1);
363
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
364
            /* get additional motion vector type */
365
            if (s->frame_pred_frame_dct)
366
                motion_type = MT_FRAME;
367
            else{
368
                motion_type = get_bits(&s->gb, 2);
369
                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 = 0;
378
            for(i=0;i<2;i++) {
379
                if (USES_LIST(mb_type, i)) {
380
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
381
                    dprintf(s->avctx, "motion_type=%d\n", motion_type);
382
                    switch(motion_type) {
383
                    case MT_FRAME: /* or MT_16X8 */
384
                        if (s->picture_structure == PICT_FRAME) {
385
                            /* MT_FRAME */
386
                            mb_type |= MB_TYPE_16x16;
387
                            s->mv_type = MV_TYPE_16X16;
388
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
389
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
390
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
391
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
392
                            /* full_pel: only for mpeg1 */
393
                            if (s->full_pel[i]){
394
                                s->mv[i][0][0] <<= 1;
395
                                s->mv[i][0][1] <<= 1;
396
                            }
397
                        } else {
398
                            /* MT_16X8 */
399
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
400
                            s->mv_type = MV_TYPE_16X8;
401
                            for(j=0;j<2;j++) {
402
                                s->field_select[i][j] = get_bits1(&s->gb);
403
                                for(k=0;k<2;k++) {
404
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
405
                                                             s->last_mv[i][j][k]);
406
                                    s->last_mv[i][j][k] = val;
407
                                    s->mv[i][j][k] = val;
408
                                }
409
                            }
410
                        }
411
                        break;
412
                    case MT_FIELD:
413
                        s->mv_type = MV_TYPE_FIELD;
414
                        if (s->picture_structure == PICT_FRAME) {
415
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
416
                            for(j=0;j<2;j++) {
417
                                s->field_select[i][j] = get_bits1(&s->gb);
418
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
419
                                                         s->last_mv[i][j][0]);
420
                                s->last_mv[i][j][0] = val;
421
                                s->mv[i][j][0] = val;
422
                                dprintf(s->avctx, "fmx=%d\n", val);
423
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
424
                                                         s->last_mv[i][j][1] >> 1);
425
                                s->last_mv[i][j][1] = val << 1;
426
                                s->mv[i][j][1] = val;
427
                                dprintf(s->avctx, "fmy=%d\n", val);
428
                            }
429
                        } else {
430
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
431
                            s->field_select[i][0] = get_bits1(&s->gb);
432
                            for(k=0;k<2;k++) {
433
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
434
                                                         s->last_mv[i][0][k]);
435
                                s->last_mv[i][0][k] = val;
436
                                s->last_mv[i][1][k] = val;
437
                                s->mv[i][0][k] = val;
438
                            }
439
                        }
440
                        break;
441
                    case MT_DMV:
442
                        {
443
                            int dmx, dmy, mx, my, m;
444

    
445
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
446
                                                    s->last_mv[i][0][0]);
447
                            s->last_mv[i][0][0] = mx;
448
                            s->last_mv[i][1][0] = mx;
449
                            dmx = get_dmv(s);
450
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
451
                                                    s->last_mv[i][0][1] >> 1);
452
                            dmy = get_dmv(s);
453
                            s->mv_type = MV_TYPE_DMV;
454

    
455

    
456
                            s->last_mv[i][0][1] = my<<1;
457
                            s->last_mv[i][1][1] = my<<1;
458

    
459
                            s->mv[i][0][0] = mx;
460
                            s->mv[i][0][1] = my;
461
                            s->mv[i][1][0] = mx;//not used
462
                            s->mv[i][1][1] = my;//not used
463

    
464
                            if (s->picture_structure == PICT_FRAME) {
465
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
466

    
467
                                //m = 1 + 2 * s->top_field_first;
468
                                m = s->top_field_first ? 1 : 3;
469

    
470
                                /* top -> top pred */
471
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
472
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
473
                                m = 4 - m;
474
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
475
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
476
                            } else {
477
                                mb_type |= MB_TYPE_16x16;
478

    
479
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
480
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
481
                                if(s->picture_structure == PICT_TOP_FIELD)
482
                                    s->mv[i][2][1]--;
483
                                else
484
                                    s->mv[i][2][1]++;
485
                            }
486
                        }
487
                        break;
488
                    default:
489
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
490
                        return -1;
491
                    }
492
                }
493
            }
494
        }
495

    
496
        s->mb_intra = 0;
497
        if (HAS_CBP(mb_type)) {
498
            s->dsp.clear_blocks(s->block[0]);
499

    
500
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
501
            if(mb_block_count > 6){
502
                 cbp<<= mb_block_count-6;
503
                 cbp |= get_bits(&s->gb, mb_block_count-6);
504
                 s->dsp.clear_blocks(s->block[6]);
505
            }
506
            if (cbp <= 0){
507
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
508
                return -1;
509
            }
510

    
511
#ifdef HAVE_XVMC
512
            //on 1 we memcpy blocks in xvmcvideo
513
            if(s->avctx->xvmc_acceleration > 1){
514
                XVMC_pack_pblocks(s,cbp);
515
                if(s->swap_uv){
516
                    exchange_uv(s);
517
                }
518
            }
519
#endif
520

    
521
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
522
                if(s->flags2 & CODEC_FLAG2_FAST){
523
                    for(i=0;i<6;i++) {
524
                        if(cbp & 32) {
525
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
526
                        } else {
527
                            s->block_last_index[i] = -1;
528
                        }
529
                        cbp+=cbp;
530
                    }
531
                }else{
532
                    cbp<<= 12-mb_block_count;
533

    
534
                    for(i=0;i<mb_block_count;i++) {
535
                        if ( cbp & (1<<11) ) {
536
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
537
                                return -1;
538
                        } else {
539
                            s->block_last_index[i] = -1;
540
                        }
541
                        cbp+=cbp;
542
                    }
543
                }
544
            } else {
545
                if(s->flags2 & CODEC_FLAG2_FAST){
546
                    for(i=0;i<6;i++) {
547
                        if (cbp & 32) {
548
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
549
                        } else {
550
                            s->block_last_index[i] = -1;
551
                        }
552
                        cbp+=cbp;
553
                    }
554
                }else{
555
                    for(i=0;i<6;i++) {
556
                        if (cbp & 32) {
557
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
558
                                return -1;
559
                        } else {
560
                            s->block_last_index[i] = -1;
561
                        }
562
                        cbp+=cbp;
563
                    }
564
                }
565
            }
566
        }else{
567
            for(i=0;i<12;i++)
568
                s->block_last_index[i] = -1;
569
        }
570
    }
571

    
572
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
573

    
574
    return 0;
575
}
576

    
577
/* as h263, but only 17 codes */
578
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
579
{
580
    int code, sign, val, l, shift;
581

    
582
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
583
    if (code == 0) {
584
        return pred;
585
    }
586
    if (code < 0) {
587
        return 0xffff;
588
    }
589

    
590
    sign = get_bits1(&s->gb);
591
    shift = fcode - 1;
592
    val = code;
593
    if (shift) {
594
        val = (val - 1) << shift;
595
        val |= get_bits(&s->gb, shift);
596
        val++;
597
    }
598
    if (sign)
599
        val = -val;
600
    val += pred;
601

    
602
    /* modulo decoding */
603
    l= INT_BIT - 5 - shift;
604
    val = (val<<l)>>l;
605
    return val;
606
}
607

    
608
static inline int decode_dc(GetBitContext *gb, int component)
609
{
610
    int code, diff;
611

    
612
    if (component == 0) {
613
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
614
    } else {
615
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
616
    }
617
    if (code < 0){
618
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
619
        return 0xffff;
620
    }
621
    if (code == 0) {
622
        diff = 0;
623
    } else {
624
        diff = get_xbits(gb, code);
625
    }
626
    return diff;
627
}
628

    
629
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
630
                               DCTELEM *block,
631
                               int n)
632
{
633
    int level, dc, diff, i, j, run;
634
    int component;
635
    RLTable *rl = &ff_rl_mpeg1;
636
    uint8_t * const scantable= s->intra_scantable.permutated;
637
    const uint16_t *quant_matrix= s->intra_matrix;
638
    const int qscale= s->qscale;
639

    
640
    /* DC coef */
641
    component = (n <= 3 ? 0 : n - 4 + 1);
642
    diff = decode_dc(&s->gb, component);
643
    if (diff >= 0xffff)
644
        return -1;
645
    dc = s->last_dc[component];
646
    dc += diff;
647
    s->last_dc[component] = dc;
648
    block[0] = dc<<3;
649
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
650
    i = 0;
651
    {
652
        OPEN_READER(re, &s->gb);
653
        /* now quantify & encode AC coefs */
654
        for(;;) {
655
            UPDATE_CACHE(re, &s->gb);
656
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
657

    
658
            if(level == 127){
659
                break;
660
            } else if(level != 0) {
661
                i += run;
662
                j = scantable[i];
663
                level= (level*qscale*quant_matrix[j])>>4;
664
                level= (level-1)|1;
665
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
666
                LAST_SKIP_BITS(re, &s->gb, 1);
667
            } else {
668
                /* escape */
669
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
670
                UPDATE_CACHE(re, &s->gb);
671
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
672
                if (level == -128) {
673
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
674
                } else if (level == 0) {
675
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
676
                }
677
                i += run;
678
                j = scantable[i];
679
                if(level<0){
680
                    level= -level;
681
                    level= (level*qscale*quant_matrix[j])>>4;
682
                    level= (level-1)|1;
683
                    level= -level;
684
                }else{
685
                    level= (level*qscale*quant_matrix[j])>>4;
686
                    level= (level-1)|1;
687
                }
688
            }
689
            if (i > 63){
690
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
691
                return -1;
692
            }
693

    
694
            block[j] = level;
695
        }
696
        CLOSE_READER(re, &s->gb);
697
    }
698
    s->block_last_index[n] = i;
699
   return 0;
700
}
701

    
702
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
703
                               DCTELEM *block,
704
                               int n)
705
{
706
    int level, i, j, run;
707
    RLTable *rl = &ff_rl_mpeg1;
708
    uint8_t * const scantable= s->intra_scantable.permutated;
709
    const uint16_t *quant_matrix= s->inter_matrix;
710
    const int qscale= s->qscale;
711

    
712
    {
713
        OPEN_READER(re, &s->gb);
714
        i = -1;
715
        /* special case for the first coef. no need to add a second vlc table */
716
        UPDATE_CACHE(re, &s->gb);
717
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
718
            level= (3*qscale*quant_matrix[0])>>5;
719
            level= (level-1)|1;
720
            if(GET_CACHE(re, &s->gb)&0x40000000)
721
                level= -level;
722
            block[0] = level;
723
            i++;
724
            SKIP_BITS(re, &s->gb, 2);
725
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
726
                goto end;
727
        }
728

    
729
        /* now quantify & encode AC coefs */
730
        for(;;) {
731
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
732

    
733
            if(level != 0) {
734
                i += run;
735
                j = scantable[i];
736
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
737
                level= (level-1)|1;
738
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
739
                SKIP_BITS(re, &s->gb, 1);
740
            } else {
741
                /* escape */
742
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
743
                UPDATE_CACHE(re, &s->gb);
744
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
745
                if (level == -128) {
746
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
747
                } else if (level == 0) {
748
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
749
                }
750
                i += run;
751
                j = scantable[i];
752
                if(level<0){
753
                    level= -level;
754
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
755
                    level= (level-1)|1;
756
                    level= -level;
757
                }else{
758
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
759
                    level= (level-1)|1;
760
                }
761
            }
762
            if (i > 63){
763
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
764
                return -1;
765
            }
766

    
767
            block[j] = level;
768
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
769
                break;
770
            UPDATE_CACHE(re, &s->gb);
771
        }
772
end:
773
        LAST_SKIP_BITS(re, &s->gb, 2);
774
        CLOSE_READER(re, &s->gb);
775
    }
776
    s->block_last_index[n] = i;
777
    return 0;
778
}
779

    
780
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
781
{
782
    int level, i, j, run;
783
    RLTable *rl = &ff_rl_mpeg1;
784
    uint8_t * const scantable= s->intra_scantable.permutated;
785
    const int qscale= s->qscale;
786

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

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

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

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

    
851

    
852
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
853
                               DCTELEM *block,
854
                               int n)
855
{
856
    int level, i, j, run;
857
    RLTable *rl = &ff_rl_mpeg1;
858
    uint8_t * const scantable= s->intra_scantable.permutated;
859
    const uint16_t *quant_matrix;
860
    const int qscale= s->qscale;
861
    int mismatch;
862

    
863
    mismatch = 1;
864

    
865
    {
866
        OPEN_READER(re, &s->gb);
867
        i = -1;
868
        if (n < 4)
869
            quant_matrix = s->inter_matrix;
870
        else
871
            quant_matrix = s->chroma_inter_matrix;
872

    
873
        /* special case for the first coef. no need to add a second vlc table */
874
        UPDATE_CACHE(re, &s->gb);
875
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
876
            level= (3*qscale*quant_matrix[0])>>5;
877
            if(GET_CACHE(re, &s->gb)&0x40000000)
878
                level= -level;
879
            block[0] = level;
880
            mismatch ^= level;
881
            i++;
882
            SKIP_BITS(re, &s->gb, 2);
883
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
884
                goto end;
885
        }
886

    
887
        /* now quantify & encode AC coefs */
888
        for(;;) {
889
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
890

    
891
            if(level != 0) {
892
                i += run;
893
                j = scantable[i];
894
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
895
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
896
                SKIP_BITS(re, &s->gb, 1);
897
            } else {
898
                /* escape */
899
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
900
                UPDATE_CACHE(re, &s->gb);
901
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
902

    
903
                i += run;
904
                j = scantable[i];
905
                if(level<0){
906
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
907
                    level= -level;
908
                }else{
909
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
910
                }
911
            }
912
            if (i > 63){
913
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
914
                return -1;
915
            }
916

    
917
            mismatch ^= level;
918
            block[j] = level;
919
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
920
                break;
921
            UPDATE_CACHE(re, &s->gb);
922
        }
923
end:
924
        LAST_SKIP_BITS(re, &s->gb, 2);
925
        CLOSE_READER(re, &s->gb);
926
    }
927
    block[63] ^= (mismatch & 1);
928

    
929
    s->block_last_index[n] = i;
930
    return 0;
931
}
932

    
933
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
934
                               DCTELEM *block,
935
                               int n)
936
{
937
    int level, i, j, run;
938
    RLTable *rl = &ff_rl_mpeg1;
939
    uint8_t * const scantable= s->intra_scantable.permutated;
940
    const int qscale= s->qscale;
941
    OPEN_READER(re, &s->gb);
942
    i = -1;
943

    
944
    /* special case for the first coef. no need to add a second vlc table */
945
    UPDATE_CACHE(re, &s->gb);
946
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
947
        level= (3*qscale)>>1;
948
        if(GET_CACHE(re, &s->gb)&0x40000000)
949
            level= -level;
950
        block[0] = level;
951
        i++;
952
        SKIP_BITS(re, &s->gb, 2);
953
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
954
            goto end;
955
    }
956

    
957
    /* now quantify & encode AC coefs */
958
    for(;;) {
959
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
960

    
961
        if(level != 0) {
962
            i += run;
963
            j = scantable[i];
964
            level= ((level*2+1)*qscale)>>1;
965
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
966
            SKIP_BITS(re, &s->gb, 1);
967
        } else {
968
            /* escape */
969
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
970
            UPDATE_CACHE(re, &s->gb);
971
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
972

    
973
            i += run;
974
            j = scantable[i];
975
            if(level<0){
976
                level= ((-level*2+1)*qscale)>>1;
977
                level= -level;
978
            }else{
979
                level= ((level*2+1)*qscale)>>1;
980
            }
981
        }
982

    
983
        block[j] = level;
984
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
985
            break;
986
        UPDATE_CACHE(re, &s->gb);
987
    }
988
end:
989
    LAST_SKIP_BITS(re, &s->gb, 2);
990
    CLOSE_READER(re, &s->gb);
991
    s->block_last_index[n] = i;
992
    return 0;
993
}
994

    
995

    
996
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
997
                               DCTELEM *block,
998
                               int n)
999
{
1000
    int level, dc, diff, i, j, run;
1001
    int component;
1002
    RLTable *rl;
1003
    uint8_t * const scantable= s->intra_scantable.permutated;
1004
    const uint16_t *quant_matrix;
1005
    const int qscale= s->qscale;
1006
    int mismatch;
1007

    
1008
    /* DC coef */
1009
    if (n < 4){
1010
        quant_matrix = s->intra_matrix;
1011
        component = 0;
1012
    }else{
1013
        quant_matrix = s->chroma_intra_matrix;
1014
        component = (n&1) + 1;
1015
    }
1016
    diff = decode_dc(&s->gb, component);
1017
    if (diff >= 0xffff)
1018
        return -1;
1019
    dc = s->last_dc[component];
1020
    dc += diff;
1021
    s->last_dc[component] = dc;
1022
    block[0] = dc << (3 - s->intra_dc_precision);
1023
    dprintf(s->avctx, "dc=%d\n", block[0]);
1024
    mismatch = block[0] ^ 1;
1025
    i = 0;
1026
    if (s->intra_vlc_format)
1027
        rl = &ff_rl_mpeg2;
1028
    else
1029
        rl = &ff_rl_mpeg1;
1030

    
1031
    {
1032
        OPEN_READER(re, &s->gb);
1033
        /* now quantify & encode AC coefs */
1034
        for(;;) {
1035
            UPDATE_CACHE(re, &s->gb);
1036
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1037

    
1038
            if(level == 127){
1039
                break;
1040
            } else if(level != 0) {
1041
                i += run;
1042
                j = scantable[i];
1043
                level= (level*qscale*quant_matrix[j])>>4;
1044
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1045
                LAST_SKIP_BITS(re, &s->gb, 1);
1046
            } else {
1047
                /* escape */
1048
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1049
                UPDATE_CACHE(re, &s->gb);
1050
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1051
                i += run;
1052
                j = scantable[i];
1053
                if(level<0){
1054
                    level= (-level*qscale*quant_matrix[j])>>4;
1055
                    level= -level;
1056
                }else{
1057
                    level= (level*qscale*quant_matrix[j])>>4;
1058
                }
1059
            }
1060
            if (i > 63){
1061
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1062
                return -1;
1063
            }
1064

    
1065
            mismatch^= level;
1066
            block[j] = level;
1067
        }
1068
        CLOSE_READER(re, &s->gb);
1069
    }
1070
    block[63]^= mismatch&1;
1071

    
1072
    s->block_last_index[n] = i;
1073
    return 0;
1074
}
1075

    
1076
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1077
                               DCTELEM *block,
1078
                               int n)
1079
{
1080
    int level, dc, diff, j, run;
1081
    int component;
1082
    RLTable *rl;
1083
    uint8_t * scantable= s->intra_scantable.permutated;
1084
    const uint16_t *quant_matrix;
1085
    const int qscale= s->qscale;
1086

    
1087
    /* DC coef */
1088
    if (n < 4){
1089
        quant_matrix = s->intra_matrix;
1090
        component = 0;
1091
    }else{
1092
        quant_matrix = s->chroma_intra_matrix;
1093
        component = (n&1) + 1;
1094
    }
1095
    diff = decode_dc(&s->gb, component);
1096
    if (diff >= 0xffff)
1097
        return -1;
1098
    dc = s->last_dc[component];
1099
    dc += diff;
1100
    s->last_dc[component] = dc;
1101
    block[0] = dc << (3 - s->intra_dc_precision);
1102
    if (s->intra_vlc_format)
1103
        rl = &ff_rl_mpeg2;
1104
    else
1105
        rl = &ff_rl_mpeg1;
1106

    
1107
    {
1108
        OPEN_READER(re, &s->gb);
1109
        /* now quantify & encode AC coefs */
1110
        for(;;) {
1111
            UPDATE_CACHE(re, &s->gb);
1112
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1113

    
1114
            if(level == 127){
1115
                break;
1116
            } else if(level != 0) {
1117
                scantable += run;
1118
                j = *scantable;
1119
                level= (level*qscale*quant_matrix[j])>>4;
1120
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1121
                LAST_SKIP_BITS(re, &s->gb, 1);
1122
            } else {
1123
                /* escape */
1124
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1125
                UPDATE_CACHE(re, &s->gb);
1126
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1127
                scantable += run;
1128
                j = *scantable;
1129
                if(level<0){
1130
                    level= (-level*qscale*quant_matrix[j])>>4;
1131
                    level= -level;
1132
                }else{
1133
                    level= (level*qscale*quant_matrix[j])>>4;
1134
                }
1135
            }
1136

    
1137
            block[j] = level;
1138
        }
1139
        CLOSE_READER(re, &s->gb);
1140
    }
1141

    
1142
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1143
    return 0;
1144
}
1145

    
1146
typedef struct Mpeg1Context {
1147
    MpegEncContext mpeg_enc_ctx;
1148
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1149
    int repeat_field; /* true if we must repeat the field */
1150
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1151
    int slice_count;
1152
    int swap_uv;//indicate VCR2
1153
    int save_aspect_info;
1154
    int save_width, save_height;
1155
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1156

    
1157
} Mpeg1Context;
1158

    
1159
static int mpeg_decode_init(AVCodecContext *avctx)
1160
{
1161
    Mpeg1Context *s = avctx->priv_data;
1162
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1163
    int i;
1164

    
1165
    //we need some parmutation to store
1166
    //matrixes, until MPV_common_init()
1167
    //set the real permutatuon
1168
    for(i=0;i<64;i++)
1169
       s2->dsp.idct_permutation[i]=i;
1170

    
1171
    MPV_decode_defaults(s2);
1172

    
1173
    s->mpeg_enc_ctx.avctx= avctx;
1174
    s->mpeg_enc_ctx.flags= avctx->flags;
1175
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1176
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1177
    init_vlcs();
1178

    
1179
    s->mpeg_enc_ctx_allocated = 0;
1180
    s->mpeg_enc_ctx.picture_number = 0;
1181
    s->repeat_field = 0;
1182
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1183
    return 0;
1184
}
1185

    
1186
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1187
                                     const uint8_t *new_perm){
1188
    uint16_t temp_matrix[64];
1189
    int i;
1190

    
1191
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1192

    
1193
    for(i=0;i<64;i++){
1194
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1195
    }
1196
}
1197

    
1198
//Call this function when we know all parameters
1199
//it may be called in different places for mpeg1 and mpeg2
1200
static int mpeg_decode_postinit(AVCodecContext *avctx){
1201
    Mpeg1Context *s1 = avctx->priv_data;
1202
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1203
    uint8_t old_permutation[64];
1204

    
1205
    if (
1206
        (s1->mpeg_enc_ctx_allocated == 0)||
1207
        avctx->coded_width  != s->width ||
1208
        avctx->coded_height != s->height||
1209
        s1->save_width != s->width ||
1210
        s1->save_height != s->height ||
1211
        s1->save_aspect_info != s->aspect_ratio_info||
1212
        0)
1213
    {
1214

    
1215
        if (s1->mpeg_enc_ctx_allocated) {
1216
            ParseContext pc= s->parse_context;
1217
            s->parse_context.buffer=0;
1218
            MPV_common_end(s);
1219
            s->parse_context= pc;
1220
        }
1221

    
1222
        if( (s->width == 0 )||(s->height == 0))
1223
            return -2;
1224

    
1225
        avcodec_set_dimensions(avctx, s->width, s->height);
1226
        avctx->bit_rate = s->bit_rate;
1227
        s1->save_aspect_info = s->aspect_ratio_info;
1228
        s1->save_width = s->width;
1229
        s1->save_height = s->height;
1230

    
1231
     //low_delay may be forced, in this case we will have B frames
1232
     //that behave like P frames
1233
        avctx->has_b_frames = !(s->low_delay);
1234

    
1235
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1236
            //mpeg1 fps
1237
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1238
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1239
            //mpeg1 aspect
1240
            avctx->sample_aspect_ratio= av_d2q(
1241
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1242

    
1243
        }else{//mpeg2
1244
        //mpeg2 fps
1245
            av_reduce(
1246
                &s->avctx->time_base.den,
1247
                &s->avctx->time_base.num,
1248
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1249
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1250
                1<<30);
1251
        //mpeg2 aspect
1252
            if(s->aspect_ratio_info > 1){
1253
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1254
                    s->avctx->sample_aspect_ratio=
1255
                        av_div_q(
1256
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1257
                         (AVRational){s->width, s->height}
1258
                         );
1259
                }else{
1260
                    s->avctx->sample_aspect_ratio=
1261
                        av_div_q(
1262
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1263
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1264
                        );
1265
                }
1266
            }else{
1267
                s->avctx->sample_aspect_ratio=
1268
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1269
            }
1270
        }//mpeg2
1271

    
1272
        if(avctx->xvmc_acceleration){
1273
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1274
        }else{
1275
            if(s->chroma_format <  2){
1276
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1277
            }else
1278
            if(s->chroma_format == 2){
1279
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1280
            }else
1281
            if(s->chroma_format >  2){
1282
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1283
            }
1284
        }
1285
        //until then pix_fmt may be changed right after codec init
1286
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1287
            if( avctx->idct_algo == FF_IDCT_AUTO )
1288
                avctx->idct_algo = FF_IDCT_SIMPLE;
1289

    
1290
        //quantization matrixes may need reordering
1291
        //if dct permutation is changed
1292
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1293

    
1294
        if (MPV_common_init(s) < 0)
1295
            return -2;
1296

    
1297
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1298
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1299
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1300
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1301

    
1302
        s1->mpeg_enc_ctx_allocated = 1;
1303
    }
1304
    return 0;
1305
}
1306

    
1307
static int mpeg1_decode_picture(AVCodecContext *avctx,
1308
                                const uint8_t *buf, int buf_size)
1309
{
1310
    Mpeg1Context *s1 = avctx->priv_data;
1311
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1312
    int ref, f_code, vbv_delay;
1313

    
1314
    if(mpeg_decode_postinit(s->avctx) < 0)
1315
       return -2;
1316

    
1317
    init_get_bits(&s->gb, buf, buf_size*8);
1318

    
1319
    ref = get_bits(&s->gb, 10); /* temporal ref */
1320
    s->pict_type = get_bits(&s->gb, 3);
1321
    if(s->pict_type == 0 || s->pict_type > 3)
1322
        return -1;
1323

    
1324
    vbv_delay= get_bits(&s->gb, 16);
1325
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1326
        s->full_pel[0] = get_bits1(&s->gb);
1327
        f_code = get_bits(&s->gb, 3);
1328
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1329
            return -1;
1330
        s->mpeg_f_code[0][0] = f_code;
1331
        s->mpeg_f_code[0][1] = f_code;
1332
    }
1333
    if (s->pict_type == B_TYPE) {
1334
        s->full_pel[1] = get_bits1(&s->gb);
1335
        f_code = get_bits(&s->gb, 3);
1336
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1337
            return -1;
1338
        s->mpeg_f_code[1][0] = f_code;
1339
        s->mpeg_f_code[1][1] = f_code;
1340
    }
1341
    s->current_picture.pict_type= s->pict_type;
1342
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1343

    
1344
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1345
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1346

    
1347
    s->y_dc_scale = 8;
1348
    s->c_dc_scale = 8;
1349
    s->first_slice = 1;
1350
    return 0;
1351
}
1352

    
1353
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1354
{
1355
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1356
    int horiz_size_ext, vert_size_ext;
1357
    int bit_rate_ext;
1358

    
1359
    skip_bits(&s->gb, 1); /* profil and level esc*/
1360
    s->avctx->profile= get_bits(&s->gb, 3);
1361
    s->avctx->level= get_bits(&s->gb, 4);
1362
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1363
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1364
    horiz_size_ext = get_bits(&s->gb, 2);
1365
    vert_size_ext = get_bits(&s->gb, 2);
1366
    s->width |= (horiz_size_ext << 12);
1367
    s->height |= (vert_size_ext << 12);
1368
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1369
    s->bit_rate += (bit_rate_ext << 18) * 400;
1370
    skip_bits1(&s->gb); /* marker */
1371
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1372

    
1373
    s->low_delay = get_bits1(&s->gb);
1374
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1375

    
1376
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1377
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1378

    
1379
    dprintf(s->avctx, "sequence extension\n");
1380
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1381
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1382

    
1383
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1384
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1385
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1386

    
1387
}
1388

    
1389
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1390
{
1391
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1392
    int color_description, w, h;
1393

    
1394
    skip_bits(&s->gb, 3); /* video format */
1395
    color_description= get_bits1(&s->gb);
1396
    if(color_description){
1397
        skip_bits(&s->gb, 8); /* color primaries */
1398
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1399
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1400
    }
1401
    w= get_bits(&s->gb, 14);
1402
    skip_bits(&s->gb, 1); //marker
1403
    h= get_bits(&s->gb, 14);
1404
    skip_bits(&s->gb, 1); //marker
1405

    
1406
    s1->pan_scan.width= 16*w;
1407
    s1->pan_scan.height=16*h;
1408

    
1409
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1410
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1411
}
1412

    
1413
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1414
{
1415
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1416
    int i,nofco;
1417

    
1418
    nofco = 1;
1419
    if(s->progressive_sequence){
1420
        if(s->repeat_first_field){
1421
            nofco++;
1422
            if(s->top_field_first)
1423
                nofco++;
1424
        }
1425
    }else{
1426
        if(s->picture_structure == PICT_FRAME){
1427
            nofco++;
1428
            if(s->repeat_first_field)
1429
                nofco++;
1430
        }
1431
    }
1432
    for(i=0; i<nofco; i++){
1433
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1434
        skip_bits(&s->gb, 1); //marker
1435
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1436
        skip_bits(&s->gb, 1); //marker
1437
    }
1438

    
1439
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1440
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1441
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1442
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1443
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1444
        );
1445
}
1446

    
1447
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1448
{
1449
    int i, v, j;
1450

    
1451
    dprintf(s->avctx, "matrix extension\n");
1452

    
1453
    if (get_bits1(&s->gb)) {
1454
        for(i=0;i<64;i++) {
1455
            v = get_bits(&s->gb, 8);
1456
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1457
            s->intra_matrix[j] = v;
1458
            s->chroma_intra_matrix[j] = v;
1459
        }
1460
    }
1461
    if (get_bits1(&s->gb)) {
1462
        for(i=0;i<64;i++) {
1463
            v = get_bits(&s->gb, 8);
1464
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1465
            s->inter_matrix[j] = v;
1466
            s->chroma_inter_matrix[j] = v;
1467
        }
1468
    }
1469
    if (get_bits1(&s->gb)) {
1470
        for(i=0;i<64;i++) {
1471
            v = get_bits(&s->gb, 8);
1472
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1473
            s->chroma_intra_matrix[j] = v;
1474
        }
1475
    }
1476
    if (get_bits1(&s->gb)) {
1477
        for(i=0;i<64;i++) {
1478
            v = get_bits(&s->gb, 8);
1479
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1480
            s->chroma_inter_matrix[j] = v;
1481
        }
1482
    }
1483
}
1484

    
1485
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1486
{
1487
    s->full_pel[0] = s->full_pel[1] = 0;
1488
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1489
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1490
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1491
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1492
    s->intra_dc_precision = get_bits(&s->gb, 2);
1493
    s->picture_structure = get_bits(&s->gb, 2);
1494
    s->top_field_first = get_bits1(&s->gb);
1495
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1496
    s->concealment_motion_vectors = get_bits1(&s->gb);
1497
    s->q_scale_type = get_bits1(&s->gb);
1498
    s->intra_vlc_format = get_bits1(&s->gb);
1499
    s->alternate_scan = get_bits1(&s->gb);
1500
    s->repeat_first_field = get_bits1(&s->gb);
1501
    s->chroma_420_type = get_bits1(&s->gb);
1502
    s->progressive_frame = get_bits1(&s->gb);
1503

    
1504
    if(s->picture_structure == PICT_FRAME){
1505
        s->first_field=0;
1506
        s->v_edge_pos= 16*s->mb_height;
1507
    }else{
1508
        s->first_field ^= 1;
1509
        s->v_edge_pos=  8*s->mb_height;
1510
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1511
    }
1512

    
1513
    if(s->alternate_scan){
1514
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1515
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1516
    }else{
1517
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1518
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1519
    }
1520

    
1521
    /* composite display not parsed */
1522
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1523
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1524
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1525
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1526
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1527
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1528
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1529
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1530
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1531
}
1532

    
1533
static void mpeg_decode_extension(AVCodecContext *avctx,
1534
                                  const uint8_t *buf, int buf_size)
1535
{
1536
    Mpeg1Context *s1 = avctx->priv_data;
1537
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1538
    int ext_type;
1539

    
1540
    init_get_bits(&s->gb, buf, buf_size*8);
1541

    
1542
    ext_type = get_bits(&s->gb, 4);
1543
    switch(ext_type) {
1544
    case 0x1:
1545
        mpeg_decode_sequence_extension(s1);
1546
        break;
1547
    case 0x2:
1548
        mpeg_decode_sequence_display_extension(s1);
1549
        break;
1550
    case 0x3:
1551
        mpeg_decode_quant_matrix_extension(s);
1552
        break;
1553
    case 0x7:
1554
        mpeg_decode_picture_display_extension(s1);
1555
        break;
1556
    case 0x8:
1557
        mpeg_decode_picture_coding_extension(s);
1558
        break;
1559
    }
1560
}
1561

    
1562
static void exchange_uv(MpegEncContext *s){
1563
    short * tmp = s->pblocks[4];
1564
    s->pblocks[4] = s->pblocks[5];
1565
    s->pblocks[5] = tmp;
1566
}
1567

    
1568
static int mpeg_field_start(MpegEncContext *s){
1569
    AVCodecContext *avctx= s->avctx;
1570
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1571

    
1572
    /* start frame decoding */
1573
    if(s->first_field || s->picture_structure==PICT_FRAME){
1574
        if(MPV_frame_start(s, avctx) < 0)
1575
            return -1;
1576

    
1577
        ff_er_frame_start(s);
1578

    
1579
        /* first check if we must repeat the frame */
1580
        s->current_picture_ptr->repeat_pict = 0;
1581
        if (s->repeat_first_field) {
1582
            if (s->progressive_sequence) {
1583
                if (s->top_field_first)
1584
                    s->current_picture_ptr->repeat_pict = 4;
1585
                else
1586
                    s->current_picture_ptr->repeat_pict = 2;
1587
            } else if (s->progressive_frame) {
1588
                s->current_picture_ptr->repeat_pict = 1;
1589
            }
1590
        }
1591

    
1592
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1593
    }else{ //second field
1594
            int i;
1595

    
1596
            if(!s->current_picture_ptr){
1597
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1598
                return -1;
1599
            }
1600

    
1601
            for(i=0; i<4; i++){
1602
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1603
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1604
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1605
                }
1606
            }
1607
    }
1608
#ifdef HAVE_XVMC
1609
// MPV_frame_start will call this function too,
1610
// but we need to call it on every field
1611
    if(s->avctx->xvmc_acceleration)
1612
         XVMC_field_start(s,avctx);
1613
#endif
1614

    
1615
    return 0;
1616
}
1617

    
1618
#define DECODE_SLICE_ERROR -1
1619
#define DECODE_SLICE_OK 0
1620

    
1621
/**
1622
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1623
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1624
 *         DECODE_SLICE_OK if this slice is ok<br>
1625
 */
1626
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1627
                             const uint8_t **buf, int buf_size)
1628
{
1629
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1630
    AVCodecContext *avctx= s->avctx;
1631
    const int field_pic= s->picture_structure != PICT_FRAME;
1632
    const int lowres= s->avctx->lowres;
1633

    
1634
    s->resync_mb_x=
1635
    s->resync_mb_y= -1;
1636

    
1637
    if (mb_y<<field_pic >= s->mb_height){
1638
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1639
        return -1;
1640
    }
1641

    
1642
    init_get_bits(&s->gb, *buf, buf_size*8);
1643

    
1644
    ff_mpeg1_clean_buffers(s);
1645
    s->interlaced_dct = 0;
1646

    
1647
    s->qscale = get_qscale(s);
1648

    
1649
    if(s->qscale == 0){
1650
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1651
        return -1;
1652
    }
1653

    
1654
    /* extra slice info */
1655
    while (get_bits1(&s->gb) != 0) {
1656
        skip_bits(&s->gb, 8);
1657
    }
1658

    
1659
    s->mb_x=0;
1660

    
1661
    for(;;) {
1662
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1663
        if (code < 0){
1664
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1665
            return -1;
1666
        }
1667
        if (code >= 33) {
1668
            if (code == 33) {
1669
                s->mb_x += 33;
1670
            }
1671
            /* otherwise, stuffing, nothing to do */
1672
        } else {
1673
            s->mb_x += code;
1674
            break;
1675
        }
1676
    }
1677
    if(s->mb_x >= (unsigned)s->mb_width){
1678
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1679
        return -1;
1680
    }
1681

    
1682
    s->resync_mb_x= s->mb_x;
1683
    s->resync_mb_y= s->mb_y= mb_y;
1684
    s->mb_skip_run= 0;
1685
    ff_init_block_index(s);
1686

    
1687
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1688
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1689
             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",
1690
                 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],
1691
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1692
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1693
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1694
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1695
        }
1696
    }
1697

    
1698
    for(;;) {
1699
#ifdef HAVE_XVMC
1700
        //one 1 we memcpy blocks in xvmcvideo
1701
        if(s->avctx->xvmc_acceleration > 1)
1702
            XVMC_init_block(s);//set s->block
1703
#endif
1704

    
1705
        if(mpeg_decode_mb(s, s->block) < 0)
1706
            return -1;
1707

    
1708
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1709
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1710
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1711
            int motion_x, motion_y, dir, i;
1712
            if(field_pic && !s->first_field)
1713
                xy += wrap/2;
1714

    
1715
            for(i=0; i<2; i++){
1716
                for(dir=0; dir<2; dir++){
1717
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1718
                        motion_x = motion_y = 0;
1719
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1720
                        motion_x = s->mv[dir][0][0];
1721
                        motion_y = s->mv[dir][0][1];
1722
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1723
                        motion_x = s->mv[dir][i][0];
1724
                        motion_y = s->mv[dir][i][1];
1725
                    }
1726

    
1727
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1728
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1729
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1730
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1731
                    s->current_picture.ref_index [dir][xy    ]=
1732
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1733
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1734
                }
1735
                xy += wrap;
1736
            }
1737
        }
1738

    
1739
        s->dest[0] += 16 >> lowres;
1740
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1741
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1742

    
1743
        MPV_decode_mb(s, s->block);
1744

    
1745
        if (++s->mb_x >= s->mb_width) {
1746
            const int mb_size= 16>>s->avctx->lowres;
1747

    
1748
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1749

    
1750
            s->mb_x = 0;
1751
            s->mb_y++;
1752

    
1753
            if(s->mb_y<<field_pic >= s->mb_height){
1754
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1755
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1756
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1757
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1758

    
1759
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1760
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1761
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1762
                    return -1;
1763
                }else
1764
                    goto eos;
1765
            }
1766

    
1767
            ff_init_block_index(s);
1768
        }
1769

    
1770
        /* skip mb handling */
1771
        if (s->mb_skip_run == -1) {
1772
            /* read again increment */
1773
            s->mb_skip_run = 0;
1774
            for(;;) {
1775
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1776
                if (code < 0){
1777
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1778
                    return -1;
1779
                }
1780
                if (code >= 33) {
1781
                    if (code == 33) {
1782
                        s->mb_skip_run += 33;
1783
                    }else if(code == 35){
1784
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1785
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1786
                            return -1;
1787
                        }
1788
                        goto eos; /* end of slice */
1789
                    }
1790
                    /* otherwise, stuffing, nothing to do */
1791
                } else {
1792
                    s->mb_skip_run += code;
1793
                    break;
1794
                }
1795
            }
1796
            if(s->mb_skip_run){
1797
                int i;
1798
                if(s->pict_type == I_TYPE){
1799
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1800
                    return -1;
1801
                }
1802

    
1803
                /* skip mb */
1804
                s->mb_intra = 0;
1805
                for(i=0;i<12;i++)
1806
                    s->block_last_index[i] = -1;
1807
                if(s->picture_structure == PICT_FRAME)
1808
                    s->mv_type = MV_TYPE_16X16;
1809
                else
1810
                    s->mv_type = MV_TYPE_FIELD;
1811
                if (s->pict_type == P_TYPE) {
1812
                    /* if P type, zero motion vector is implied */
1813
                    s->mv_dir = MV_DIR_FORWARD;
1814
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1815
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1816
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1817
                    s->field_select[0][0]= s->picture_structure - 1;
1818
                } else {
1819
                    /* if B type, reuse previous vectors and directions */
1820
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1821
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1822
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1823
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1824
                }
1825
            }
1826
        }
1827
    }
1828
eos: // end of slice
1829
    *buf += get_bits_count(&s->gb)/8 - 1;
1830
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1831
    return 0;
1832
}
1833

    
1834
static int slice_decode_thread(AVCodecContext *c, void *arg){
1835
    MpegEncContext *s= arg;
1836
    const uint8_t *buf= s->gb.buffer;
1837
    int mb_y= s->start_mb_y;
1838

    
1839
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1840

    
1841
    for(;;){
1842
        uint32_t start_code;
1843
        int ret;
1844

    
1845
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1846
        emms_c();
1847
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1848
//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);
1849
        if(ret < 0){
1850
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1851
                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);
1852
        }else{
1853
            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);
1854
        }
1855

    
1856
        if(s->mb_y == s->end_mb_y)
1857
            return 0;
1858

    
1859
        start_code= -1;
1860
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1861
        mb_y= start_code - SLICE_MIN_START_CODE;
1862
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1863
            return -1;
1864
    }
1865

    
1866
    return 0; //not reached
1867
}
1868

    
1869
/**
1870
 * handles slice ends.
1871
 * @return 1 if it seems to be the last slice of
1872
 */
1873
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1874
{
1875
    Mpeg1Context *s1 = avctx->priv_data;
1876
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1877

    
1878
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1879
        return 0;
1880

    
1881
#ifdef HAVE_XVMC
1882
    if(s->avctx->xvmc_acceleration)
1883
        XVMC_field_end(s);
1884
#endif
1885
    /* end of slice reached */
1886
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1887
        /* end of image */
1888

    
1889
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1890

    
1891
        ff_er_frame_end(s);
1892

    
1893
        MPV_frame_end(s);
1894

    
1895
        if (s->pict_type == B_TYPE || s->low_delay) {
1896
            *pict= *(AVFrame*)s->current_picture_ptr;
1897
            ff_print_debug_info(s, pict);
1898
        } else {
1899
            s->picture_number++;
1900
            /* latency of 1 frame for I and P frames */
1901
            /* XXX: use another variable than picture_number */
1902
            if (s->last_picture_ptr != NULL) {
1903
                *pict= *(AVFrame*)s->last_picture_ptr;
1904
                 ff_print_debug_info(s, pict);
1905
            }
1906
        }
1907

    
1908
        return 1;
1909
    } else {
1910
        return 0;
1911
    }
1912
}
1913

    
1914
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1915
                                 const uint8_t *buf, int buf_size)
1916
{
1917
    Mpeg1Context *s1 = avctx->priv_data;
1918
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1919
    int width,height;
1920
    int i, v, j;
1921

    
1922
    init_get_bits(&s->gb, buf, buf_size*8);
1923

    
1924
    width = get_bits(&s->gb, 12);
1925
    height = get_bits(&s->gb, 12);
1926
    if (width <= 0 || height <= 0 ||
1927
        (width % 2) != 0 || (height % 2) != 0)
1928
        return -1;
1929
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1930
    if (s->aspect_ratio_info == 0)
1931
        return -1;
1932
    s->frame_rate_index = get_bits(&s->gb, 4);
1933
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1934
        return -1;
1935
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1936
    if (get_bits1(&s->gb) == 0) /* marker */
1937
        return -1;
1938
    s->width = width;
1939
    s->height = height;
1940

    
1941
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1942
    skip_bits(&s->gb, 1);
1943

    
1944
    /* get matrix */
1945
    if (get_bits1(&s->gb)) {
1946
        for(i=0;i<64;i++) {
1947
            v = get_bits(&s->gb, 8);
1948
            if(v==0){
1949
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1950
                return -1;
1951
            }
1952
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1953
            s->intra_matrix[j] = v;
1954
            s->chroma_intra_matrix[j] = v;
1955
        }
1956
#ifdef DEBUG
1957
        dprintf(s->avctx, "intra matrix present\n");
1958
        for(i=0;i<64;i++)
1959
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1960
        dprintf(s->avctx, "\n");
1961
#endif
1962
    } else {
1963
        for(i=0;i<64;i++) {
1964
            j = s->dsp.idct_permutation[i];
1965
            v = ff_mpeg1_default_intra_matrix[i];
1966
            s->intra_matrix[j] = v;
1967
            s->chroma_intra_matrix[j] = v;
1968
        }
1969
    }
1970
    if (get_bits1(&s->gb)) {
1971
        for(i=0;i<64;i++) {
1972
            v = get_bits(&s->gb, 8);
1973
            if(v==0){
1974
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1975
                return -1;
1976
            }
1977
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1978
            s->inter_matrix[j] = v;
1979
            s->chroma_inter_matrix[j] = v;
1980
        }
1981
#ifdef DEBUG
1982
        dprintf(s->avctx, "non intra matrix present\n");
1983
        for(i=0;i<64;i++)
1984
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1985
        dprintf(s->avctx, "\n");
1986
#endif
1987
    } else {
1988
        for(i=0;i<64;i++) {
1989
            int j= s->dsp.idct_permutation[i];
1990
            v = ff_mpeg1_default_non_intra_matrix[i];
1991
            s->inter_matrix[j] = v;
1992
            s->chroma_inter_matrix[j] = v;
1993
        }
1994
    }
1995

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

    
2001
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2002
    s->progressive_sequence = 1;
2003
    s->progressive_frame = 1;
2004
    s->picture_structure = PICT_FRAME;
2005
    s->frame_pred_frame_dct = 1;
2006
    s->chroma_format = 1;
2007
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2008
    avctx->sub_id = 1; /* indicates mpeg1 */
2009
    s->out_format = FMT_MPEG1;
2010
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2011
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2012

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

    
2017
    return 0;
2018
}
2019

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

    
2026
    /* start new mpeg1 context decoding */
2027
    s->out_format = FMT_MPEG1;
2028
    if (s1->mpeg_enc_ctx_allocated) {
2029
        MPV_common_end(s);
2030
    }
2031
    s->width  = avctx->coded_width;
2032
    s->height = avctx->coded_height;
2033
    avctx->has_b_frames= 0; //true?
2034
    s->low_delay= 1;
2035

    
2036
    if(avctx->xvmc_acceleration){
2037
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2038
    }else{
2039
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2040
    }
2041

    
2042
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2043
        if( avctx->idct_algo == FF_IDCT_AUTO )
2044
            avctx->idct_algo = FF_IDCT_SIMPLE;
2045

    
2046
    if (MPV_common_init(s) < 0)
2047
        return -1;
2048
    exchange_uv(s);//common init reset pblocks, so we swap them here
2049
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2050
    s1->mpeg_enc_ctx_allocated = 1;
2051

    
2052
    for(i=0;i<64;i++) {
2053
        int j= s->dsp.idct_permutation[i];
2054
        v = ff_mpeg1_default_intra_matrix[i];
2055
        s->intra_matrix[j] = v;
2056
        s->chroma_intra_matrix[j] = v;
2057

    
2058
        v = ff_mpeg1_default_non_intra_matrix[i];
2059
        s->inter_matrix[j] = v;
2060
        s->chroma_inter_matrix[j] = v;
2061
    }
2062

    
2063
    s->progressive_sequence = 1;
2064
    s->progressive_frame = 1;
2065
    s->picture_structure = PICT_FRAME;
2066
    s->frame_pred_frame_dct = 1;
2067
    s->chroma_format = 1;
2068
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2069
    avctx->sub_id = 2; /* indicates mpeg2 */
2070
    return 0;
2071
}
2072

    
2073

    
2074
static void mpeg_decode_user_data(AVCodecContext *avctx,
2075
                                  const uint8_t *buf, int buf_size)
2076
{
2077
    const uint8_t *p;
2078
    int len, flags;
2079
    p = buf;
2080
    len = buf_size;
2081

    
2082
    /* we parse the DTG active format information */
2083
    if (len >= 5 &&
2084
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2085
        flags = p[4];
2086
        p += 5;
2087
        len -= 5;
2088
        if (flags & 0x80) {
2089
            /* skip event id */
2090
            if (len < 2)
2091
                return;
2092
            p += 2;
2093
            len -= 2;
2094
        }
2095
        if (flags & 0x40) {
2096
            if (len < 1)
2097
                return;
2098
            avctx->dtg_active_format = p[0] & 0x0f;
2099
        }
2100
    }
2101
}
2102

    
2103
static void mpeg_decode_gop(AVCodecContext *avctx,
2104
                            const uint8_t *buf, int buf_size){
2105
    Mpeg1Context *s1 = avctx->priv_data;
2106
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2107

    
2108
    int drop_frame_flag;
2109
    int time_code_hours, time_code_minutes;
2110
    int time_code_seconds, time_code_pictures;
2111
    int broken_link;
2112

    
2113
    init_get_bits(&s->gb, buf, buf_size*8);
2114

    
2115
    drop_frame_flag = get_bits1(&s->gb);
2116

    
2117
    time_code_hours=get_bits(&s->gb,5);
2118
    time_code_minutes = get_bits(&s->gb,6);
2119
    skip_bits1(&s->gb);//marker bit
2120
    time_code_seconds = get_bits(&s->gb,6);
2121
    time_code_pictures = get_bits(&s->gb,6);
2122

    
2123
    /*broken_link indicate that after editing the
2124
      reference frames of the first B-Frames after GOP I-Frame
2125
      are missing (open gop)*/
2126
    broken_link = get_bits1(&s->gb);
2127

    
2128
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2129
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2130
            time_code_hours, time_code_minutes, time_code_seconds,
2131
            time_code_pictures, broken_link);
2132
}
2133
/**
2134
 * finds the end of the current frame in the bitstream.
2135
 * @return the position of the first byte of the next frame, or -1
2136
 */
2137
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2138
{
2139
    int i;
2140
    uint32_t state= pc->state;
2141

    
2142
    i=0;
2143
    if(!pc->frame_start_found){
2144
        for(i=0; i<buf_size; i++){
2145
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2146
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2147
                i++;
2148
                pc->frame_start_found=1;
2149
                break;
2150
            }
2151
        }
2152
    }
2153

    
2154
    if(pc->frame_start_found){
2155
        /* EOF considered as end of frame */
2156
        if (buf_size == 0)
2157
            return 0;
2158
        for(; i<buf_size; i++){
2159
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2160
            if((state&0xFFFFFF00) == 0x100){
2161
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2162
                    pc->frame_start_found=0;
2163
                    pc->state=-1;
2164
                    return i-3;
2165
                }
2166
            }
2167
        }
2168
    }
2169
    pc->state= state;
2170
    return END_NOT_FOUND;
2171
}
2172

    
2173
/* handle buffering and image synchronisation */
2174
static int mpeg_decode_frame(AVCodecContext *avctx,
2175
                             void *data, int *data_size,
2176
                             uint8_t *buf, int buf_size)
2177
{
2178
    Mpeg1Context *s = avctx->priv_data;
2179
    const uint8_t *buf_end;
2180
    const uint8_t *buf_ptr;
2181
    uint32_t start_code;
2182
    int ret, input_size;
2183
    AVFrame *picture = data;
2184
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2185
    dprintf(avctx, "fill_buffer\n");
2186

    
2187
    if (buf_size == 0) {
2188
        /* special case for last picture */
2189
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2190
            *picture= *(AVFrame*)s2->next_picture_ptr;
2191
            s2->next_picture_ptr= NULL;
2192

    
2193
            *data_size = sizeof(AVFrame);
2194
        }
2195
        return 0;
2196
    }
2197

    
2198
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2199
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2200

    
2201
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2202
            return buf_size;
2203
    }
2204

    
2205
    buf_ptr = buf;
2206
    buf_end = buf + buf_size;
2207

    
2208
#if 0
2209
    if (s->repeat_field % 2 == 1) {
2210
        s->repeat_field++;
2211
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2212
        //        s2->picture_number, s->repeat_field);
2213
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2214
            *data_size = sizeof(AVPicture);
2215
            goto the_end;
2216
        }
2217
    }
2218
#endif
2219

    
2220
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2221
        vcr2_init_sequence(avctx);
2222

    
2223
    s->slice_count= 0;
2224

    
2225
    for(;;) {
2226
        /* find start next code */
2227
        start_code = -1;
2228
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2229
        if (start_code > 0x1ff){
2230
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2231
                if(avctx->thread_count > 1){
2232
                    int i;
2233

    
2234
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2235
                    for(i=0; i<s->slice_count; i++)
2236
                        s2->error_count += s2->thread_context[i]->error_count;
2237
                }
2238
                if (slice_end(avctx, picture)) {
2239
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2240
                        *data_size = sizeof(AVPicture);
2241
                }
2242
            }
2243
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2244
        }
2245

    
2246
        input_size = buf_end - buf_ptr;
2247

    
2248
        if(avctx->debug & FF_DEBUG_STARTCODE){
2249
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2250
        }
2251

    
2252
        /* prepare data for next start code */
2253
        switch(start_code) {
2254
        case SEQ_START_CODE:
2255
            mpeg1_decode_sequence(avctx, buf_ptr,
2256
                                    input_size);
2257
            break;
2258

    
2259
        case PICTURE_START_CODE:
2260
            /* we have a complete image : we try to decompress it */
2261
            mpeg1_decode_picture(avctx,
2262
                                    buf_ptr, input_size);
2263
            break;
2264
        case EXT_START_CODE:
2265
            mpeg_decode_extension(avctx,
2266
                                    buf_ptr, input_size);
2267
            break;
2268
        case USER_START_CODE:
2269
            mpeg_decode_user_data(avctx,
2270
                                    buf_ptr, input_size);
2271
            break;
2272
        case GOP_START_CODE:
2273
            s2->first_field=0;
2274
            mpeg_decode_gop(avctx,
2275
                                    buf_ptr, input_size);
2276
            break;
2277
        default:
2278
            if (start_code >= SLICE_MIN_START_CODE &&
2279
                start_code <= SLICE_MAX_START_CODE) {
2280
                int mb_y= start_code - SLICE_MIN_START_CODE;
2281

    
2282
                if(s2->last_picture_ptr==NULL){
2283
                /* Skip B-frames if we do not have reference frames. */
2284
                    if(s2->pict_type==B_TYPE) break;
2285
                /* Skip P-frames if we do not have reference frame no valid header. */
2286
//                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2287
                }
2288
                /* Skip B-frames if we are in a hurry. */
2289
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2290
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2291
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2292
                    || avctx->skip_frame >= AVDISCARD_ALL)
2293
                    break;
2294
                /* Skip everything if we are in a hurry>=5. */
2295
                if(avctx->hurry_up>=5) break;
2296

    
2297
                if (!s->mpeg_enc_ctx_allocated) break;
2298

    
2299
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2300
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2301
                        break;
2302
                }
2303

    
2304
                if(s2->first_slice){
2305
                    s2->first_slice=0;
2306
                            if(mpeg_field_start(s2) < 0)
2307
                        return -1;
2308
                    }
2309
                if(!s2->current_picture_ptr){
2310
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2311
                    return -1;
2312
                }
2313

    
2314
                if(avctx->thread_count > 1){
2315
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2316
                    if(threshold <= mb_y){
2317
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2318

    
2319
                        thread_context->start_mb_y= mb_y;
2320
                        thread_context->end_mb_y  = s2->mb_height;
2321
                        if(s->slice_count){
2322
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2323
                            ff_update_duplicate_context(thread_context, s2);
2324
                        }
2325
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2326
                        s->slice_count++;
2327
                    }
2328
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
2329
                }else{
2330
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2331
                    emms_c();
2332

    
2333
                    if(ret < 0){
2334
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2335
                            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);
2336
                    }else{
2337
                        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);
2338
                    }
2339
                }
2340
            }
2341
            break;
2342
        }
2343
    }
2344
}
2345

    
2346
static int mpeg_decode_end(AVCodecContext *avctx)
2347
{
2348
    Mpeg1Context *s = avctx->priv_data;
2349

    
2350
    if (s->mpeg_enc_ctx_allocated)
2351
        MPV_common_end(&s->mpeg_enc_ctx);
2352
    return 0;
2353
}
2354

    
2355
AVCodec mpeg1video_decoder = {
2356
    "mpeg1video",
2357
    CODEC_TYPE_VIDEO,
2358
    CODEC_ID_MPEG1VIDEO,
2359
    sizeof(Mpeg1Context),
2360
    mpeg_decode_init,
2361
    NULL,
2362
    mpeg_decode_end,
2363
    mpeg_decode_frame,
2364
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2365
    .flush= ff_mpeg_flush,
2366
};
2367

    
2368
AVCodec mpeg2video_decoder = {
2369
    "mpeg2video",
2370
    CODEC_TYPE_VIDEO,
2371
    CODEC_ID_MPEG2VIDEO,
2372
    sizeof(Mpeg1Context),
2373
    mpeg_decode_init,
2374
    NULL,
2375
    mpeg_decode_end,
2376
    mpeg_decode_frame,
2377
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2378
    .flush= ff_mpeg_flush,
2379
};
2380

    
2381
//legacy decoder
2382
AVCodec mpegvideo_decoder = {
2383
    "mpegvideo",
2384
    CODEC_TYPE_VIDEO,
2385
    CODEC_ID_MPEG2VIDEO,
2386
    sizeof(Mpeg1Context),
2387
    mpeg_decode_init,
2388
    NULL,
2389
    mpeg_decode_end,
2390
    mpeg_decode_frame,
2391
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2392
    .flush= ff_mpeg_flush,
2393
};
2394

    
2395
#ifdef HAVE_XVMC
2396
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2397
    Mpeg1Context *s;
2398

    
2399
    if( avctx->thread_count > 1)
2400
        return -1;
2401
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2402
        return -1;
2403
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2404
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2405
    }
2406
    mpeg_decode_init(avctx);
2407
    s = avctx->priv_data;
2408

    
2409
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2410
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2411

    
2412
    return 0;
2413
}
2414

    
2415
AVCodec mpeg_xvmc_decoder = {
2416
    "mpegvideo_xvmc",
2417
    CODEC_TYPE_VIDEO,
2418
    CODEC_ID_MPEG2VIDEO_XVMC,
2419
    sizeof(Mpeg1Context),
2420
    mpeg_mc_decode_init,
2421
    NULL,
2422
    mpeg_decode_end,
2423
    mpeg_decode_frame,
2424
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2425
    .flush= ff_mpeg_flush,
2426
};
2427

    
2428
#endif
2429

    
2430
/* this is ugly i know, but the alternative is too make
2431
   hundreds of vars global and prefix them with ff_mpeg1_
2432
   which is far uglier. */
2433
#include "mdec.c"