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1
/*
2
 * MPEG1/2 decoder
3
 * Copyright (c) 2000,2001 Fabrice Bellard.
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
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 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file mpeg12.c
25
 * MPEG1/2 decoder
26
 */
27

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

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

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

    
41

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

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

    
68
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
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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= (mb_type>>13)&3;
378
            dprintf(s->avctx, "motion_type=%d\n", motion_type);
379
            switch(motion_type) {
380
            case MT_FRAME: /* or MT_16X8 */
381
                if (s->picture_structure == PICT_FRAME) {
382
                    mb_type |= MB_TYPE_16x16;
383
                    s->mv_type = MV_TYPE_16X16;
384
                    for(i=0;i<2;i++) {
385
                        if (USES_LIST(mb_type, i)) {
386
                            /* MT_FRAME */
387
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
388
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
389
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
390
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
391
                            /* full_pel: only for mpeg1 */
392
                            if (s->full_pel[i]){
393
                                s->mv[i][0][0] <<= 1;
394
                                s->mv[i][0][1] <<= 1;
395
                            }
396
                        }
397
                    }
398
                } else {
399
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
400
                    s->mv_type = MV_TYPE_16X8;
401
                    for(i=0;i<2;i++) {
402
                        if (USES_LIST(mb_type, i)) {
403
                            /* MT_16X8 */
404
                            for(j=0;j<2;j++) {
405
                                s->field_select[i][j] = get_bits1(&s->gb);
406
                                for(k=0;k<2;k++) {
407
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
408
                                                             s->last_mv[i][j][k]);
409
                                    s->last_mv[i][j][k] = val;
410
                                    s->mv[i][j][k] = val;
411
                                }
412
                            }
413
                        }
414
                    }
415
                }
416
                break;
417
            case MT_FIELD:
418
                s->mv_type = MV_TYPE_FIELD;
419
                if (s->picture_structure == PICT_FRAME) {
420
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
421
                    for(i=0;i<2;i++) {
422
                        if (USES_LIST(mb_type, i)) {
423
                            for(j=0;j<2;j++) {
424
                                s->field_select[i][j] = get_bits1(&s->gb);
425
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
426
                                                         s->last_mv[i][j][0]);
427
                                s->last_mv[i][j][0] = val;
428
                                s->mv[i][j][0] = val;
429
                                dprintf(s->avctx, "fmx=%d\n", val);
430
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
431
                                                         s->last_mv[i][j][1] >> 1);
432
                                s->last_mv[i][j][1] = val << 1;
433
                                s->mv[i][j][1] = val;
434
                                dprintf(s->avctx, "fmy=%d\n", val);
435
                            }
436
                        }
437
                    }
438
                } else {
439
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
440
                    for(i=0;i<2;i++) {
441
                        if (USES_LIST(mb_type, i)) {
442
                            s->field_select[i][0] = get_bits1(&s->gb);
443
                            for(k=0;k<2;k++) {
444
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
445
                                                         s->last_mv[i][0][k]);
446
                                s->last_mv[i][0][k] = val;
447
                                s->last_mv[i][1][k] = val;
448
                                s->mv[i][0][k] = val;
449
                            }
450
                        }
451
                    }
452
                }
453
                break;
454
            case MT_DMV:
455
                s->mv_type = MV_TYPE_DMV;
456
                for(i=0;i<2;i++) {
457
                    if (USES_LIST(mb_type, i)) {
458
                        int dmx, dmy, mx, my, m;
459
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
460
                                                s->last_mv[i][0][0]);
461
                        s->last_mv[i][0][0] = mx;
462
                        s->last_mv[i][1][0] = mx;
463
                        dmx = get_dmv(s);
464
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
465
                                                s->last_mv[i][0][1] >> 1);
466
                        dmy = get_dmv(s);
467

    
468

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

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

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

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

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

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

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

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

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

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

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

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

    
586
    return 0;
587
}
588

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

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

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

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

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

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

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

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

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

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

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

    
724
    {
725
        OPEN_READER(re, &s->gb);
726
        i = -1;
727
        /* special case for the first coef. no need to add a second vlc table */
728
        UPDATE_CACHE(re, &s->gb);
729
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
730
            level= (3*qscale*quant_matrix[0])>>5;
731
            level= (level-1)|1;
732
            if(GET_CACHE(re, &s->gb)&0x40000000)
733
                level= -level;
734
            block[0] = level;
735
            i++;
736
            SKIP_BITS(re, &s->gb, 2);
737
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
738
                goto end;
739
        }
740
#if MIN_CACHE_BITS < 19
741
        UPDATE_CACHE(re, &s->gb);
742
#endif
743
        /* now quantify & encode AC coefs */
744
        for(;;) {
745
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
746

    
747
            if(level != 0) {
748
                i += run;
749
                j = scantable[i];
750
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
751
                level= (level-1)|1;
752
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
753
                SKIP_BITS(re, &s->gb, 1);
754
            } else {
755
                /* escape */
756
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
757
                UPDATE_CACHE(re, &s->gb);
758
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
759
                if (level == -128) {
760
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
761
                } else if (level == 0) {
762
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
763
                }
764
                i += run;
765
                j = scantable[i];
766
                if(level<0){
767
                    level= -level;
768
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
769
                    level= (level-1)|1;
770
                    level= -level;
771
                }else{
772
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
773
                    level= (level-1)|1;
774
                }
775
            }
776
            if (i > 63){
777
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
778
                return -1;
779
            }
780

    
781
            block[j] = level;
782
#if MIN_CACHE_BITS < 19
783
            UPDATE_CACHE(re, &s->gb);
784
#endif
785
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
786
                break;
787
#if MIN_CACHE_BITS >= 19
788
            UPDATE_CACHE(re, &s->gb);
789
#endif
790
        }
791
end:
792
        LAST_SKIP_BITS(re, &s->gb, 2);
793
        CLOSE_READER(re, &s->gb);
794
    }
795
    s->block_last_index[n] = i;
796
    return 0;
797
}
798

    
799
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
800
{
801
    int level, i, j, run;
802
    RLTable *rl = &ff_rl_mpeg1;
803
    uint8_t * const scantable= s->intra_scantable.permutated;
804
    const int qscale= s->qscale;
805

    
806
    {
807
        OPEN_READER(re, &s->gb);
808
        i = -1;
809
        /* special case for the first coef. no need to add a second vlc table */
810
        UPDATE_CACHE(re, &s->gb);
811
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
812
            level= (3*qscale)>>1;
813
            level= (level-1)|1;
814
            if(GET_CACHE(re, &s->gb)&0x40000000)
815
                level= -level;
816
            block[0] = level;
817
            i++;
818
            SKIP_BITS(re, &s->gb, 2);
819
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
820
                goto end;
821
        }
822
#if MIN_CACHE_BITS < 19
823
        UPDATE_CACHE(re, &s->gb);
824
#endif
825

    
826
        /* now quantify & encode AC coefs */
827
        for(;;) {
828
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
829

    
830
            if(level != 0) {
831
                i += run;
832
                j = scantable[i];
833
                level= ((level*2+1)*qscale)>>1;
834
                level= (level-1)|1;
835
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
836
                SKIP_BITS(re, &s->gb, 1);
837
            } else {
838
                /* escape */
839
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
840
                UPDATE_CACHE(re, &s->gb);
841
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
842
                if (level == -128) {
843
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
844
                } else if (level == 0) {
845
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
846
                }
847
                i += run;
848
                j = scantable[i];
849
                if(level<0){
850
                    level= -level;
851
                    level= ((level*2+1)*qscale)>>1;
852
                    level= (level-1)|1;
853
                    level= -level;
854
                }else{
855
                    level= ((level*2+1)*qscale)>>1;
856
                    level= (level-1)|1;
857
                }
858
            }
859

    
860
            block[j] = level;
861
#if MIN_CACHE_BITS < 19
862
            UPDATE_CACHE(re, &s->gb);
863
#endif
864
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
865
                break;
866
#if MIN_CACHE_BITS >= 19
867
            UPDATE_CACHE(re, &s->gb);
868
#endif
869
        }
870
end:
871
        LAST_SKIP_BITS(re, &s->gb, 2);
872
        CLOSE_READER(re, &s->gb);
873
    }
874
    s->block_last_index[n] = i;
875
    return 0;
876
}
877

    
878

    
879
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
880
                               DCTELEM *block,
881
                               int n)
882
{
883
    int level, i, j, run;
884
    RLTable *rl = &ff_rl_mpeg1;
885
    uint8_t * const scantable= s->intra_scantable.permutated;
886
    const uint16_t *quant_matrix;
887
    const int qscale= s->qscale;
888
    int mismatch;
889

    
890
    mismatch = 1;
891

    
892
    {
893
        OPEN_READER(re, &s->gb);
894
        i = -1;
895
        if (n < 4)
896
            quant_matrix = s->inter_matrix;
897
        else
898
            quant_matrix = s->chroma_inter_matrix;
899

    
900
        /* special case for the first coef. no need to add a second vlc table */
901
        UPDATE_CACHE(re, &s->gb);
902
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
903
            level= (3*qscale*quant_matrix[0])>>5;
904
            if(GET_CACHE(re, &s->gb)&0x40000000)
905
                level= -level;
906
            block[0] = level;
907
            mismatch ^= level;
908
            i++;
909
            SKIP_BITS(re, &s->gb, 2);
910
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
911
                goto end;
912
        }
913
#if MIN_CACHE_BITS < 19
914
        UPDATE_CACHE(re, &s->gb);
915
#endif
916

    
917
        /* now quantify & encode AC coefs */
918
        for(;;) {
919
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
920

    
921
            if(level != 0) {
922
                i += run;
923
                j = scantable[i];
924
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
925
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
926
                SKIP_BITS(re, &s->gb, 1);
927
            } else {
928
                /* escape */
929
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
930
                UPDATE_CACHE(re, &s->gb);
931
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
932

    
933
                i += run;
934
                j = scantable[i];
935
                if(level<0){
936
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
937
                    level= -level;
938
                }else{
939
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
940
                }
941
            }
942
            if (i > 63){
943
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
944
                return -1;
945
            }
946

    
947
            mismatch ^= level;
948
            block[j] = level;
949
#if MIN_CACHE_BITS < 19
950
            UPDATE_CACHE(re, &s->gb);
951
#endif
952
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
953
                break;
954
#if MIN_CACHE_BITS >= 19
955
            UPDATE_CACHE(re, &s->gb);
956
#endif
957
        }
958
end:
959
        LAST_SKIP_BITS(re, &s->gb, 2);
960
        CLOSE_READER(re, &s->gb);
961
    }
962
    block[63] ^= (mismatch & 1);
963

    
964
    s->block_last_index[n] = i;
965
    return 0;
966
}
967

    
968
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
969
                               DCTELEM *block,
970
                               int n)
971
{
972
    int level, i, j, run;
973
    RLTable *rl = &ff_rl_mpeg1;
974
    uint8_t * const scantable= s->intra_scantable.permutated;
975
    const int qscale= s->qscale;
976
    OPEN_READER(re, &s->gb);
977
    i = -1;
978

    
979
    /* special case for the first coef. no need to add a second vlc table */
980
    UPDATE_CACHE(re, &s->gb);
981
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
982
        level= (3*qscale)>>1;
983
        if(GET_CACHE(re, &s->gb)&0x40000000)
984
            level= -level;
985
        block[0] = level;
986
        i++;
987
        SKIP_BITS(re, &s->gb, 2);
988
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
989
            goto end;
990
    }
991
#if MIN_CACHE_BITS < 19
992
    UPDATE_CACHE(re, &s->gb);
993
#endif
994

    
995
    /* now quantify & encode AC coefs */
996
    for(;;) {
997
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
998

    
999
        if(level != 0) {
1000
            i += run;
1001
            j = scantable[i];
1002
            level= ((level*2+1)*qscale)>>1;
1003
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1004
            SKIP_BITS(re, &s->gb, 1);
1005
        } else {
1006
            /* escape */
1007
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1008
            UPDATE_CACHE(re, &s->gb);
1009
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1010

    
1011
            i += run;
1012
            j = scantable[i];
1013
            if(level<0){
1014
                level= ((-level*2+1)*qscale)>>1;
1015
                level= -level;
1016
            }else{
1017
                level= ((level*2+1)*qscale)>>1;
1018
            }
1019
        }
1020

    
1021
        block[j] = level;
1022
#if MIN_CACHE_BITS < 19
1023
        UPDATE_CACHE(re, &s->gb);
1024
#endif
1025
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1026
            break;
1027
#if MIN_CACHE_BITS >=19
1028
        UPDATE_CACHE(re, &s->gb);
1029
#endif
1030
    }
1031
end:
1032
    LAST_SKIP_BITS(re, &s->gb, 2);
1033
    CLOSE_READER(re, &s->gb);
1034
    s->block_last_index[n] = i;
1035
    return 0;
1036
}
1037

    
1038

    
1039
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1040
                               DCTELEM *block,
1041
                               int n)
1042
{
1043
    int level, dc, diff, i, j, run;
1044
    int component;
1045
    RLTable *rl;
1046
    uint8_t * const scantable= s->intra_scantable.permutated;
1047
    const uint16_t *quant_matrix;
1048
    const int qscale= s->qscale;
1049
    int mismatch;
1050

    
1051
    /* DC coef */
1052
    if (n < 4){
1053
        quant_matrix = s->intra_matrix;
1054
        component = 0;
1055
    }else{
1056
        quant_matrix = s->chroma_intra_matrix;
1057
        component = (n&1) + 1;
1058
    }
1059
    diff = decode_dc(&s->gb, component);
1060
    if (diff >= 0xffff)
1061
        return -1;
1062
    dc = s->last_dc[component];
1063
    dc += diff;
1064
    s->last_dc[component] = dc;
1065
    block[0] = dc << (3 - s->intra_dc_precision);
1066
    dprintf(s->avctx, "dc=%d\n", block[0]);
1067
    mismatch = block[0] ^ 1;
1068
    i = 0;
1069
    if (s->intra_vlc_format)
1070
        rl = &ff_rl_mpeg2;
1071
    else
1072
        rl = &ff_rl_mpeg1;
1073

    
1074
    {
1075
        OPEN_READER(re, &s->gb);
1076
        /* now quantify & encode AC coefs */
1077
        for(;;) {
1078
            UPDATE_CACHE(re, &s->gb);
1079
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1080

    
1081
            if(level == 127){
1082
                break;
1083
            } else if(level != 0) {
1084
                i += run;
1085
                j = scantable[i];
1086
                level= (level*qscale*quant_matrix[j])>>4;
1087
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1088
                LAST_SKIP_BITS(re, &s->gb, 1);
1089
            } else {
1090
                /* escape */
1091
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1092
                UPDATE_CACHE(re, &s->gb);
1093
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1094
                i += run;
1095
                j = scantable[i];
1096
                if(level<0){
1097
                    level= (-level*qscale*quant_matrix[j])>>4;
1098
                    level= -level;
1099
                }else{
1100
                    level= (level*qscale*quant_matrix[j])>>4;
1101
                }
1102
            }
1103
            if (i > 63){
1104
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1105
                return -1;
1106
            }
1107

    
1108
            mismatch^= level;
1109
            block[j] = level;
1110
        }
1111
        CLOSE_READER(re, &s->gb);
1112
    }
1113
    block[63]^= mismatch&1;
1114

    
1115
    s->block_last_index[n] = i;
1116
    return 0;
1117
}
1118

    
1119
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1120
                               DCTELEM *block,
1121
                               int n)
1122
{
1123
    int level, dc, diff, j, run;
1124
    int component;
1125
    RLTable *rl;
1126
    uint8_t * scantable= s->intra_scantable.permutated;
1127
    const uint16_t *quant_matrix;
1128
    const int qscale= s->qscale;
1129

    
1130
    /* DC coef */
1131
    if (n < 4){
1132
        quant_matrix = s->intra_matrix;
1133
        component = 0;
1134
    }else{
1135
        quant_matrix = s->chroma_intra_matrix;
1136
        component = (n&1) + 1;
1137
    }
1138
    diff = decode_dc(&s->gb, component);
1139
    if (diff >= 0xffff)
1140
        return -1;
1141
    dc = s->last_dc[component];
1142
    dc += diff;
1143
    s->last_dc[component] = dc;
1144
    block[0] = dc << (3 - s->intra_dc_precision);
1145
    if (s->intra_vlc_format)
1146
        rl = &ff_rl_mpeg2;
1147
    else
1148
        rl = &ff_rl_mpeg1;
1149

    
1150
    {
1151
        OPEN_READER(re, &s->gb);
1152
        /* now quantify & encode AC coefs */
1153
        for(;;) {
1154
            UPDATE_CACHE(re, &s->gb);
1155
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1156

    
1157
            if(level == 127){
1158
                break;
1159
            } else if(level != 0) {
1160
                scantable += run;
1161
                j = *scantable;
1162
                level= (level*qscale*quant_matrix[j])>>4;
1163
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1164
                LAST_SKIP_BITS(re, &s->gb, 1);
1165
            } else {
1166
                /* escape */
1167
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1168
                UPDATE_CACHE(re, &s->gb);
1169
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1170
                scantable += run;
1171
                j = *scantable;
1172
                if(level<0){
1173
                    level= (-level*qscale*quant_matrix[j])>>4;
1174
                    level= -level;
1175
                }else{
1176
                    level= (level*qscale*quant_matrix[j])>>4;
1177
                }
1178
            }
1179

    
1180
            block[j] = level;
1181
        }
1182
        CLOSE_READER(re, &s->gb);
1183
    }
1184

    
1185
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1186
    return 0;
1187
}
1188

    
1189
typedef struct Mpeg1Context {
1190
    MpegEncContext mpeg_enc_ctx;
1191
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1192
    int repeat_field; /* true if we must repeat the field */
1193
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1194
    int slice_count;
1195
    int swap_uv;//indicate VCR2
1196
    int save_aspect_info;
1197
    int save_width, save_height;
1198
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1199

    
1200
} Mpeg1Context;
1201

    
1202
static int mpeg_decode_init(AVCodecContext *avctx)
1203
{
1204
    Mpeg1Context *s = avctx->priv_data;
1205
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1206
    int i;
1207

    
1208
    //we need some parmutation to store
1209
    //matrixes, until MPV_common_init()
1210
    //set the real permutatuon
1211
    for(i=0;i<64;i++)
1212
       s2->dsp.idct_permutation[i]=i;
1213

    
1214
    MPV_decode_defaults(s2);
1215

    
1216
    s->mpeg_enc_ctx.avctx= avctx;
1217
    s->mpeg_enc_ctx.flags= avctx->flags;
1218
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1219
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1220
    init_vlcs();
1221

    
1222
    s->mpeg_enc_ctx_allocated = 0;
1223
    s->mpeg_enc_ctx.picture_number = 0;
1224
    s->repeat_field = 0;
1225
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1226
    return 0;
1227
}
1228

    
1229
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1230
                                     const uint8_t *new_perm){
1231
    uint16_t temp_matrix[64];
1232
    int i;
1233

    
1234
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1235

    
1236
    for(i=0;i<64;i++){
1237
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1238
    }
1239
}
1240

    
1241
//Call this function when we know all parameters
1242
//it may be called in different places for mpeg1 and mpeg2
1243
static int mpeg_decode_postinit(AVCodecContext *avctx){
1244
    Mpeg1Context *s1 = avctx->priv_data;
1245
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1246
    uint8_t old_permutation[64];
1247

    
1248
    if (
1249
        (s1->mpeg_enc_ctx_allocated == 0)||
1250
        avctx->coded_width  != s->width ||
1251
        avctx->coded_height != s->height||
1252
        s1->save_width != s->width ||
1253
        s1->save_height != s->height ||
1254
        s1->save_aspect_info != s->aspect_ratio_info||
1255
        0)
1256
    {
1257

    
1258
        if (s1->mpeg_enc_ctx_allocated) {
1259
            ParseContext pc= s->parse_context;
1260
            s->parse_context.buffer=0;
1261
            MPV_common_end(s);
1262
            s->parse_context= pc;
1263
        }
1264

    
1265
        if( (s->width == 0 )||(s->height == 0))
1266
            return -2;
1267

    
1268
        avcodec_set_dimensions(avctx, s->width, s->height);
1269
        avctx->bit_rate = s->bit_rate;
1270
        s1->save_aspect_info = s->aspect_ratio_info;
1271
        s1->save_width = s->width;
1272
        s1->save_height = s->height;
1273

    
1274
     //low_delay may be forced, in this case we will have B frames
1275
     //that behave like P frames
1276
        avctx->has_b_frames = !(s->low_delay);
1277

    
1278
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1279
            //mpeg1 fps
1280
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1281
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1282
            //mpeg1 aspect
1283
            avctx->sample_aspect_ratio= av_d2q(
1284
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1285

    
1286
        }else{//mpeg2
1287
        //mpeg2 fps
1288
            av_reduce(
1289
                &s->avctx->time_base.den,
1290
                &s->avctx->time_base.num,
1291
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1292
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1293
                1<<30);
1294
        //mpeg2 aspect
1295
            if(s->aspect_ratio_info > 1){
1296
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1297
                    s->avctx->sample_aspect_ratio=
1298
                        av_div_q(
1299
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1300
                         (AVRational){s->width, s->height}
1301
                         );
1302
                }else{
1303
                    s->avctx->sample_aspect_ratio=
1304
                        av_div_q(
1305
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1306
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1307
                        );
1308
                }
1309
            }else{
1310
                s->avctx->sample_aspect_ratio=
1311
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1312
            }
1313
        }//mpeg2
1314

    
1315
        if(avctx->xvmc_acceleration){
1316
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1317
        }else{
1318
            if(s->chroma_format <  2){
1319
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1320
            }else
1321
            if(s->chroma_format == 2){
1322
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1323
            }else
1324
            if(s->chroma_format >  2){
1325
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1326
            }
1327
        }
1328
        //until then pix_fmt may be changed right after codec init
1329
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1330
            if( avctx->idct_algo == FF_IDCT_AUTO )
1331
                avctx->idct_algo = FF_IDCT_SIMPLE;
1332

    
1333
        //quantization matrixes may need reordering
1334
        //if dct permutation is changed
1335
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1336

    
1337
        if (MPV_common_init(s) < 0)
1338
            return -2;
1339

    
1340
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1341
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1342
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1343
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1344

    
1345
        s1->mpeg_enc_ctx_allocated = 1;
1346
    }
1347
    return 0;
1348
}
1349

    
1350
static int mpeg1_decode_picture(AVCodecContext *avctx,
1351
                                const uint8_t *buf, int buf_size)
1352
{
1353
    Mpeg1Context *s1 = avctx->priv_data;
1354
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1355
    int ref, f_code, vbv_delay;
1356

    
1357
    if(mpeg_decode_postinit(s->avctx) < 0)
1358
       return -2;
1359

    
1360
    init_get_bits(&s->gb, buf, buf_size*8);
1361

    
1362
    ref = get_bits(&s->gb, 10); /* temporal ref */
1363
    s->pict_type = get_bits(&s->gb, 3);
1364
    if(s->pict_type == 0 || s->pict_type > 3)
1365
        return -1;
1366

    
1367
    vbv_delay= get_bits(&s->gb, 16);
1368
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1369
        s->full_pel[0] = get_bits1(&s->gb);
1370
        f_code = get_bits(&s->gb, 3);
1371
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1372
            return -1;
1373
        s->mpeg_f_code[0][0] = f_code;
1374
        s->mpeg_f_code[0][1] = f_code;
1375
    }
1376
    if (s->pict_type == B_TYPE) {
1377
        s->full_pel[1] = get_bits1(&s->gb);
1378
        f_code = get_bits(&s->gb, 3);
1379
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1380
            return -1;
1381
        s->mpeg_f_code[1][0] = f_code;
1382
        s->mpeg_f_code[1][1] = f_code;
1383
    }
1384
    s->current_picture.pict_type= s->pict_type;
1385
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1386

    
1387
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1388
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1389

    
1390
    s->y_dc_scale = 8;
1391
    s->c_dc_scale = 8;
1392
    s->first_slice = 1;
1393
    return 0;
1394
}
1395

    
1396
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1397
{
1398
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1399
    int horiz_size_ext, vert_size_ext;
1400
    int bit_rate_ext;
1401

    
1402
    skip_bits(&s->gb, 1); /* profil and level esc*/
1403
    s->avctx->profile= get_bits(&s->gb, 3);
1404
    s->avctx->level= get_bits(&s->gb, 4);
1405
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1406
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1407
    horiz_size_ext = get_bits(&s->gb, 2);
1408
    vert_size_ext = get_bits(&s->gb, 2);
1409
    s->width |= (horiz_size_ext << 12);
1410
    s->height |= (vert_size_ext << 12);
1411
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1412
    s->bit_rate += (bit_rate_ext << 18) * 400;
1413
    skip_bits1(&s->gb); /* marker */
1414
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1415

    
1416
    s->low_delay = get_bits1(&s->gb);
1417
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1418

    
1419
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1420
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1421

    
1422
    dprintf(s->avctx, "sequence extension\n");
1423
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1424
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1425

    
1426
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1427
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1428
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1429

    
1430
}
1431

    
1432
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1433
{
1434
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1435
    int color_description, w, h;
1436

    
1437
    skip_bits(&s->gb, 3); /* video format */
1438
    color_description= get_bits1(&s->gb);
1439
    if(color_description){
1440
        skip_bits(&s->gb, 8); /* color primaries */
1441
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1442
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1443
    }
1444
    w= get_bits(&s->gb, 14);
1445
    skip_bits(&s->gb, 1); //marker
1446
    h= get_bits(&s->gb, 14);
1447
    skip_bits(&s->gb, 1); //marker
1448

    
1449
    s1->pan_scan.width= 16*w;
1450
    s1->pan_scan.height=16*h;
1451

    
1452
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1453
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1454
}
1455

    
1456
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1457
{
1458
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1459
    int i,nofco;
1460

    
1461
    nofco = 1;
1462
    if(s->progressive_sequence){
1463
        if(s->repeat_first_field){
1464
            nofco++;
1465
            if(s->top_field_first)
1466
                nofco++;
1467
        }
1468
    }else{
1469
        if(s->picture_structure == PICT_FRAME){
1470
            nofco++;
1471
            if(s->repeat_first_field)
1472
                nofco++;
1473
        }
1474
    }
1475
    for(i=0; i<nofco; i++){
1476
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1477
        skip_bits(&s->gb, 1); //marker
1478
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1479
        skip_bits(&s->gb, 1); //marker
1480
    }
1481

    
1482
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1483
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1484
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1485
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1486
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1487
        );
1488
}
1489

    
1490
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1491
{
1492
    int i, v, j;
1493

    
1494
    dprintf(s->avctx, "matrix extension\n");
1495

    
1496
    if (get_bits1(&s->gb)) {
1497
        for(i=0;i<64;i++) {
1498
            v = get_bits(&s->gb, 8);
1499
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1500
            s->intra_matrix[j] = v;
1501
            s->chroma_intra_matrix[j] = v;
1502
        }
1503
    }
1504
    if (get_bits1(&s->gb)) {
1505
        for(i=0;i<64;i++) {
1506
            v = get_bits(&s->gb, 8);
1507
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1508
            s->inter_matrix[j] = v;
1509
            s->chroma_inter_matrix[j] = v;
1510
        }
1511
    }
1512
    if (get_bits1(&s->gb)) {
1513
        for(i=0;i<64;i++) {
1514
            v = get_bits(&s->gb, 8);
1515
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1516
            s->chroma_intra_matrix[j] = v;
1517
        }
1518
    }
1519
    if (get_bits1(&s->gb)) {
1520
        for(i=0;i<64;i++) {
1521
            v = get_bits(&s->gb, 8);
1522
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1523
            s->chroma_inter_matrix[j] = v;
1524
        }
1525
    }
1526
}
1527

    
1528
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1529
{
1530
    s->full_pel[0] = s->full_pel[1] = 0;
1531
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1532
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1533
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1534
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1535
    s->intra_dc_precision = get_bits(&s->gb, 2);
1536
    s->picture_structure = get_bits(&s->gb, 2);
1537
    s->top_field_first = get_bits1(&s->gb);
1538
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1539
    s->concealment_motion_vectors = get_bits1(&s->gb);
1540
    s->q_scale_type = get_bits1(&s->gb);
1541
    s->intra_vlc_format = get_bits1(&s->gb);
1542
    s->alternate_scan = get_bits1(&s->gb);
1543
    s->repeat_first_field = get_bits1(&s->gb);
1544
    s->chroma_420_type = get_bits1(&s->gb);
1545
    s->progressive_frame = get_bits1(&s->gb);
1546

    
1547
    if(s->picture_structure == PICT_FRAME){
1548
        s->first_field=0;
1549
        s->v_edge_pos= 16*s->mb_height;
1550
    }else{
1551
        s->first_field ^= 1;
1552
        s->v_edge_pos=  8*s->mb_height;
1553
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1554
    }
1555

    
1556
    if(s->alternate_scan){
1557
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1558
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1559
    }else{
1560
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1561
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1562
    }
1563

    
1564
    /* composite display not parsed */
1565
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1566
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1567
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1568
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1569
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1570
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1571
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1572
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1573
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1574
}
1575

    
1576
static void mpeg_decode_extension(AVCodecContext *avctx,
1577
                                  const uint8_t *buf, int buf_size)
1578
{
1579
    Mpeg1Context *s1 = avctx->priv_data;
1580
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1581
    int ext_type;
1582

    
1583
    init_get_bits(&s->gb, buf, buf_size*8);
1584

    
1585
    ext_type = get_bits(&s->gb, 4);
1586
    switch(ext_type) {
1587
    case 0x1:
1588
        mpeg_decode_sequence_extension(s1);
1589
        break;
1590
    case 0x2:
1591
        mpeg_decode_sequence_display_extension(s1);
1592
        break;
1593
    case 0x3:
1594
        mpeg_decode_quant_matrix_extension(s);
1595
        break;
1596
    case 0x7:
1597
        mpeg_decode_picture_display_extension(s1);
1598
        break;
1599
    case 0x8:
1600
        mpeg_decode_picture_coding_extension(s);
1601
        break;
1602
    }
1603
}
1604

    
1605
static void exchange_uv(MpegEncContext *s){
1606
    short * tmp = s->pblocks[4];
1607
    s->pblocks[4] = s->pblocks[5];
1608
    s->pblocks[5] = tmp;
1609
}
1610

    
1611
static int mpeg_field_start(MpegEncContext *s){
1612
    AVCodecContext *avctx= s->avctx;
1613
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1614

    
1615
    /* start frame decoding */
1616
    if(s->first_field || s->picture_structure==PICT_FRAME){
1617
        if(MPV_frame_start(s, avctx) < 0)
1618
            return -1;
1619

    
1620
        ff_er_frame_start(s);
1621

    
1622
        /* first check if we must repeat the frame */
1623
        s->current_picture_ptr->repeat_pict = 0;
1624
        if (s->repeat_first_field) {
1625
            if (s->progressive_sequence) {
1626
                if (s->top_field_first)
1627
                    s->current_picture_ptr->repeat_pict = 4;
1628
                else
1629
                    s->current_picture_ptr->repeat_pict = 2;
1630
            } else if (s->progressive_frame) {
1631
                s->current_picture_ptr->repeat_pict = 1;
1632
            }
1633
        }
1634

    
1635
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1636
    }else{ //second field
1637
            int i;
1638

    
1639
            if(!s->current_picture_ptr){
1640
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1641
                return -1;
1642
            }
1643

    
1644
            for(i=0; i<4; i++){
1645
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1646
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1647
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1648
                }
1649
            }
1650
    }
1651
#ifdef HAVE_XVMC
1652
// MPV_frame_start will call this function too,
1653
// but we need to call it on every field
1654
    if(s->avctx->xvmc_acceleration)
1655
         XVMC_field_start(s,avctx);
1656
#endif
1657

    
1658
    return 0;
1659
}
1660

    
1661
#define DECODE_SLICE_ERROR -1
1662
#define DECODE_SLICE_OK 0
1663

    
1664
/**
1665
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1666
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1667
 *         DECODE_SLICE_OK if this slice is ok<br>
1668
 */
1669
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1670
                             const uint8_t **buf, int buf_size)
1671
{
1672
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1673
    AVCodecContext *avctx= s->avctx;
1674
    const int field_pic= s->picture_structure != PICT_FRAME;
1675
    const int lowres= s->avctx->lowres;
1676

    
1677
    s->resync_mb_x=
1678
    s->resync_mb_y= -1;
1679

    
1680
    if (mb_y<<field_pic >= s->mb_height){
1681
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1682
        return -1;
1683
    }
1684

    
1685
    init_get_bits(&s->gb, *buf, buf_size*8);
1686

    
1687
    ff_mpeg1_clean_buffers(s);
1688
    s->interlaced_dct = 0;
1689

    
1690
    s->qscale = get_qscale(s);
1691

    
1692
    if(s->qscale == 0){
1693
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1694
        return -1;
1695
    }
1696

    
1697
    /* extra slice info */
1698
    while (get_bits1(&s->gb) != 0) {
1699
        skip_bits(&s->gb, 8);
1700
    }
1701

    
1702
    s->mb_x=0;
1703

    
1704
    for(;;) {
1705
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1706
        if (code < 0){
1707
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1708
            return -1;
1709
        }
1710
        if (code >= 33) {
1711
            if (code == 33) {
1712
                s->mb_x += 33;
1713
            }
1714
            /* otherwise, stuffing, nothing to do */
1715
        } else {
1716
            s->mb_x += code;
1717
            break;
1718
        }
1719
    }
1720
    if(s->mb_x >= (unsigned)s->mb_width){
1721
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1722
        return -1;
1723
    }
1724

    
1725
    s->resync_mb_x= s->mb_x;
1726
    s->resync_mb_y= s->mb_y= mb_y;
1727
    s->mb_skip_run= 0;
1728
    ff_init_block_index(s);
1729

    
1730
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1731
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1732
             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",
1733
                 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],
1734
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1735
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1736
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1737
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1738
        }
1739
    }
1740

    
1741
    for(;;) {
1742
#ifdef HAVE_XVMC
1743
        //one 1 we memcpy blocks in xvmcvideo
1744
        if(s->avctx->xvmc_acceleration > 1)
1745
            XVMC_init_block(s);//set s->block
1746
#endif
1747

    
1748
        if(mpeg_decode_mb(s, s->block) < 0)
1749
            return -1;
1750

    
1751
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1752
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1753
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1754
            int motion_x, motion_y, dir, i;
1755
            if(field_pic && !s->first_field)
1756
                xy += wrap/2;
1757

    
1758
            for(i=0; i<2; i++){
1759
                for(dir=0; dir<2; dir++){
1760
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1761
                        motion_x = motion_y = 0;
1762
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1763
                        motion_x = s->mv[dir][0][0];
1764
                        motion_y = s->mv[dir][0][1];
1765
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1766
                        motion_x = s->mv[dir][i][0];
1767
                        motion_y = s->mv[dir][i][1];
1768
                    }
1769

    
1770
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1771
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1772
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1773
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1774
                    s->current_picture.ref_index [dir][xy    ]=
1775
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1776
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1777
                }
1778
                xy += wrap;
1779
            }
1780
        }
1781

    
1782
        s->dest[0] += 16 >> lowres;
1783
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1784
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1785

    
1786
        MPV_decode_mb(s, s->block);
1787

    
1788
        if (++s->mb_x >= s->mb_width) {
1789
            const int mb_size= 16>>s->avctx->lowres;
1790

    
1791
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1792

    
1793
            s->mb_x = 0;
1794
            s->mb_y++;
1795

    
1796
            if(s->mb_y<<field_pic >= s->mb_height){
1797
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1798
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1799
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1800
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1801

    
1802
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1803
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1804
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1805
                    return -1;
1806
                }else
1807
                    goto eos;
1808
            }
1809

    
1810
            ff_init_block_index(s);
1811
        }
1812

    
1813
        /* skip mb handling */
1814
        if (s->mb_skip_run == -1) {
1815
            /* read again increment */
1816
            s->mb_skip_run = 0;
1817
            for(;;) {
1818
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1819
                if (code < 0){
1820
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1821
                    return -1;
1822
                }
1823
                if (code >= 33) {
1824
                    if (code == 33) {
1825
                        s->mb_skip_run += 33;
1826
                    }else if(code == 35){
1827
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1828
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1829
                            return -1;
1830
                        }
1831
                        goto eos; /* end of slice */
1832
                    }
1833
                    /* otherwise, stuffing, nothing to do */
1834
                } else {
1835
                    s->mb_skip_run += code;
1836
                    break;
1837
                }
1838
            }
1839
            if(s->mb_skip_run){
1840
                int i;
1841
                if(s->pict_type == I_TYPE){
1842
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1843
                    return -1;
1844
                }
1845

    
1846
                /* skip mb */
1847
                s->mb_intra = 0;
1848
                for(i=0;i<12;i++)
1849
                    s->block_last_index[i] = -1;
1850
                if(s->picture_structure == PICT_FRAME)
1851
                    s->mv_type = MV_TYPE_16X16;
1852
                else
1853
                    s->mv_type = MV_TYPE_FIELD;
1854
                if (s->pict_type == P_TYPE) {
1855
                    /* if P type, zero motion vector is implied */
1856
                    s->mv_dir = MV_DIR_FORWARD;
1857
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1858
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1859
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1860
                    s->field_select[0][0]= s->picture_structure - 1;
1861
                } else {
1862
                    /* if B type, reuse previous vectors and directions */
1863
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1864
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1865
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1866
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1867
                }
1868
            }
1869
        }
1870
    }
1871
eos: // end of slice
1872
    *buf += (get_bits_count(&s->gb)-1)/8;
1873
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1874
    return 0;
1875
}
1876

    
1877
static int slice_decode_thread(AVCodecContext *c, void *arg){
1878
    MpegEncContext *s= arg;
1879
    const uint8_t *buf= s->gb.buffer;
1880
    int mb_y= s->start_mb_y;
1881

    
1882
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1883

    
1884
    for(;;){
1885
        uint32_t start_code;
1886
        int ret;
1887

    
1888
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1889
        emms_c();
1890
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1891
//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);
1892
        if(ret < 0){
1893
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1894
                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);
1895
        }else{
1896
            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);
1897
        }
1898

    
1899
        if(s->mb_y == s->end_mb_y)
1900
            return 0;
1901

    
1902
        start_code= -1;
1903
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1904
        mb_y= start_code - SLICE_MIN_START_CODE;
1905
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1906
            return -1;
1907
    }
1908

    
1909
    return 0; //not reached
1910
}
1911

    
1912
/**
1913
 * handles slice ends.
1914
 * @return 1 if it seems to be the last slice of
1915
 */
1916
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1917
{
1918
    Mpeg1Context *s1 = avctx->priv_data;
1919
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1920

    
1921
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1922
        return 0;
1923

    
1924
#ifdef HAVE_XVMC
1925
    if(s->avctx->xvmc_acceleration)
1926
        XVMC_field_end(s);
1927
#endif
1928
    /* end of slice reached */
1929
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1930
        /* end of image */
1931

    
1932
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1933

    
1934
        ff_er_frame_end(s);
1935

    
1936
        MPV_frame_end(s);
1937

    
1938
        if (s->pict_type == B_TYPE || s->low_delay) {
1939
            *pict= *(AVFrame*)s->current_picture_ptr;
1940
            ff_print_debug_info(s, pict);
1941
        } else {
1942
            s->picture_number++;
1943
            /* latency of 1 frame for I and P frames */
1944
            /* XXX: use another variable than picture_number */
1945
            if (s->last_picture_ptr != NULL) {
1946
                *pict= *(AVFrame*)s->last_picture_ptr;
1947
                 ff_print_debug_info(s, pict);
1948
            }
1949
        }
1950

    
1951
        return 1;
1952
    } else {
1953
        return 0;
1954
    }
1955
}
1956

    
1957
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1958
                                 const uint8_t *buf, int buf_size)
1959
{
1960
    Mpeg1Context *s1 = avctx->priv_data;
1961
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1962
    int width,height;
1963
    int i, v, j;
1964

    
1965
    init_get_bits(&s->gb, buf, buf_size*8);
1966

    
1967
    width = get_bits(&s->gb, 12);
1968
    height = get_bits(&s->gb, 12);
1969
    if (width <= 0 || height <= 0 ||
1970
        (width % 2) != 0 || (height % 2) != 0)
1971
        return -1;
1972
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1973
    if (s->aspect_ratio_info == 0)
1974
        return -1;
1975
    s->frame_rate_index = get_bits(&s->gb, 4);
1976
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1977
        return -1;
1978
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1979
    if (get_bits1(&s->gb) == 0) /* marker */
1980
        return -1;
1981
    s->width = width;
1982
    s->height = height;
1983

    
1984
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1985
    skip_bits(&s->gb, 1);
1986

    
1987
    /* get matrix */
1988
    if (get_bits1(&s->gb)) {
1989
        for(i=0;i<64;i++) {
1990
            v = get_bits(&s->gb, 8);
1991
            if(v==0){
1992
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1993
                return -1;
1994
            }
1995
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1996
            s->intra_matrix[j] = v;
1997
            s->chroma_intra_matrix[j] = v;
1998
        }
1999
#ifdef DEBUG
2000
        dprintf(s->avctx, "intra matrix present\n");
2001
        for(i=0;i<64;i++)
2002
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2003
        dprintf(s->avctx, "\n");
2004
#endif
2005
    } else {
2006
        for(i=0;i<64;i++) {
2007
            j = s->dsp.idct_permutation[i];
2008
            v = ff_mpeg1_default_intra_matrix[i];
2009
            s->intra_matrix[j] = v;
2010
            s->chroma_intra_matrix[j] = v;
2011
        }
2012
    }
2013
    if (get_bits1(&s->gb)) {
2014
        for(i=0;i<64;i++) {
2015
            v = get_bits(&s->gb, 8);
2016
            if(v==0){
2017
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2018
                return -1;
2019
            }
2020
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2021
            s->inter_matrix[j] = v;
2022
            s->chroma_inter_matrix[j] = v;
2023
        }
2024
#ifdef DEBUG
2025
        dprintf(s->avctx, "non intra matrix present\n");
2026
        for(i=0;i<64;i++)
2027
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2028
        dprintf(s->avctx, "\n");
2029
#endif
2030
    } else {
2031
        for(i=0;i<64;i++) {
2032
            int j= s->dsp.idct_permutation[i];
2033
            v = ff_mpeg1_default_non_intra_matrix[i];
2034
            s->inter_matrix[j] = v;
2035
            s->chroma_inter_matrix[j] = v;
2036
        }
2037
    }
2038

    
2039
    if(show_bits(&s->gb, 23) != 0){
2040
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2041
        return -1;
2042
    }
2043

    
2044
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2045
    s->progressive_sequence = 1;
2046
    s->progressive_frame = 1;
2047
    s->picture_structure = PICT_FRAME;
2048
    s->frame_pred_frame_dct = 1;
2049
    s->chroma_format = 1;
2050
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2051
    avctx->sub_id = 1; /* indicates mpeg1 */
2052
    s->out_format = FMT_MPEG1;
2053
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2054
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2055

    
2056
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2057
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2058
               s->avctx->rc_buffer_size, s->bit_rate);
2059

    
2060
    return 0;
2061
}
2062

    
2063
static int vcr2_init_sequence(AVCodecContext *avctx)
2064
{
2065
    Mpeg1Context *s1 = avctx->priv_data;
2066
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2067
    int i, v;
2068

    
2069
    /* start new mpeg1 context decoding */
2070
    s->out_format = FMT_MPEG1;
2071
    if (s1->mpeg_enc_ctx_allocated) {
2072
        MPV_common_end(s);
2073
    }
2074
    s->width  = avctx->coded_width;
2075
    s->height = avctx->coded_height;
2076
    avctx->has_b_frames= 0; //true?
2077
    s->low_delay= 1;
2078

    
2079
    if(avctx->xvmc_acceleration){
2080
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2081
    }else{
2082
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2083
    }
2084

    
2085
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2086
        if( avctx->idct_algo == FF_IDCT_AUTO )
2087
            avctx->idct_algo = FF_IDCT_SIMPLE;
2088

    
2089
    if (MPV_common_init(s) < 0)
2090
        return -1;
2091
    exchange_uv(s);//common init reset pblocks, so we swap them here
2092
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2093
    s1->mpeg_enc_ctx_allocated = 1;
2094

    
2095
    for(i=0;i<64;i++) {
2096
        int j= s->dsp.idct_permutation[i];
2097
        v = ff_mpeg1_default_intra_matrix[i];
2098
        s->intra_matrix[j] = v;
2099
        s->chroma_intra_matrix[j] = v;
2100

    
2101
        v = ff_mpeg1_default_non_intra_matrix[i];
2102
        s->inter_matrix[j] = v;
2103
        s->chroma_inter_matrix[j] = v;
2104
    }
2105

    
2106
    s->progressive_sequence = 1;
2107
    s->progressive_frame = 1;
2108
    s->picture_structure = PICT_FRAME;
2109
    s->frame_pred_frame_dct = 1;
2110
    s->chroma_format = 1;
2111
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2112
    avctx->sub_id = 2; /* indicates mpeg2 */
2113
    return 0;
2114
}
2115

    
2116

    
2117
static void mpeg_decode_user_data(AVCodecContext *avctx,
2118
                                  const uint8_t *buf, int buf_size)
2119
{
2120
    const uint8_t *p;
2121
    int len, flags;
2122
    p = buf;
2123
    len = buf_size;
2124

    
2125
    /* we parse the DTG active format information */
2126
    if (len >= 5 &&
2127
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2128
        flags = p[4];
2129
        p += 5;
2130
        len -= 5;
2131
        if (flags & 0x80) {
2132
            /* skip event id */
2133
            if (len < 2)
2134
                return;
2135
            p += 2;
2136
            len -= 2;
2137
        }
2138
        if (flags & 0x40) {
2139
            if (len < 1)
2140
                return;
2141
            avctx->dtg_active_format = p[0] & 0x0f;
2142
        }
2143
    }
2144
}
2145

    
2146
static void mpeg_decode_gop(AVCodecContext *avctx,
2147
                            const uint8_t *buf, int buf_size){
2148
    Mpeg1Context *s1 = avctx->priv_data;
2149
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2150

    
2151
    int drop_frame_flag;
2152
    int time_code_hours, time_code_minutes;
2153
    int time_code_seconds, time_code_pictures;
2154
    int broken_link;
2155

    
2156
    init_get_bits(&s->gb, buf, buf_size*8);
2157

    
2158
    drop_frame_flag = get_bits1(&s->gb);
2159

    
2160
    time_code_hours=get_bits(&s->gb,5);
2161
    time_code_minutes = get_bits(&s->gb,6);
2162
    skip_bits1(&s->gb);//marker bit
2163
    time_code_seconds = get_bits(&s->gb,6);
2164
    time_code_pictures = get_bits(&s->gb,6);
2165

    
2166
    /*broken_link indicate that after editing the
2167
      reference frames of the first B-Frames after GOP I-Frame
2168
      are missing (open gop)*/
2169
    broken_link = get_bits1(&s->gb);
2170

    
2171
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2172
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2173
            time_code_hours, time_code_minutes, time_code_seconds,
2174
            time_code_pictures, broken_link);
2175
}
2176
/**
2177
 * finds the end of the current frame in the bitstream.
2178
 * @return the position of the first byte of the next frame, or -1
2179
 */
2180
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2181
{
2182
    int i;
2183
    uint32_t state= pc->state;
2184

    
2185
    /* EOF considered as end of frame */
2186
    if (buf_size == 0)
2187
        return 0;
2188

    
2189
/*
2190
 0  frame start         -> 1/4
2191
 1  first_SEQEXT        -> 0/2
2192
 2  first field start   -> 3/0
2193
 3  second_SEQEXT       -> 2/0
2194
 4  searching end
2195
*/
2196

    
2197
    for(i=0; i<buf_size; i++){
2198
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2199
        if(pc->frame_start_found&1){
2200
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2201
                pc->frame_start_found--;
2202
            else if(state == EXT_START_CODE+2){
2203
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2204
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2205
            }
2206
            state++;
2207
        }else{
2208
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2209
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2210
                i++;
2211
                pc->frame_start_found=4;
2212
            }
2213
            if(state == SEQ_END_CODE){
2214
                pc->state=-1;
2215
                return i+1;
2216
            }
2217
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2218
                pc->frame_start_found= 0;
2219
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2220
                pc->frame_start_found++;
2221
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2222
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2223
                    pc->frame_start_found=0;
2224
                    pc->state=-1;
2225
                    return i-3;
2226
                }
2227
            }
2228
        }
2229
    }
2230
    pc->state= state;
2231
    return END_NOT_FOUND;
2232
}
2233

    
2234
/* handle buffering and image synchronisation */
2235
static int mpeg_decode_frame(AVCodecContext *avctx,
2236
                             void *data, int *data_size,
2237
                             const uint8_t *buf, int buf_size)
2238
{
2239
    Mpeg1Context *s = avctx->priv_data;
2240
    const uint8_t *buf_end;
2241
    const uint8_t *buf_ptr;
2242
    uint32_t start_code;
2243
    int ret, input_size;
2244
    AVFrame *picture = data;
2245
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2246
    dprintf(avctx, "fill_buffer\n");
2247

    
2248
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2249
        /* special case for last picture */
2250
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2251
            *picture= *(AVFrame*)s2->next_picture_ptr;
2252
            s2->next_picture_ptr= NULL;
2253

    
2254
            *data_size = sizeof(AVFrame);
2255
        }
2256
        return buf_size;
2257
    }
2258

    
2259
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2260
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2261

    
2262
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2263
            return buf_size;
2264
    }
2265

    
2266
    buf_ptr = buf;
2267
    buf_end = buf + buf_size;
2268

    
2269
#if 0
2270
    if (s->repeat_field % 2 == 1) {
2271
        s->repeat_field++;
2272
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2273
        //        s2->picture_number, s->repeat_field);
2274
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2275
            *data_size = sizeof(AVPicture);
2276
            goto the_end;
2277
        }
2278
    }
2279
#endif
2280

    
2281
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2282
        vcr2_init_sequence(avctx);
2283

    
2284
    s->slice_count= 0;
2285

    
2286
    for(;;) {
2287
        /* find start next code */
2288
        start_code = -1;
2289
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2290
        if (start_code > 0x1ff){
2291
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2292
                if(avctx->thread_count > 1){
2293
                    int i;
2294

    
2295
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2296
                    for(i=0; i<s->slice_count; i++)
2297
                        s2->error_count += s2->thread_context[i]->error_count;
2298
                }
2299
                if (slice_end(avctx, picture)) {
2300
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2301
                        *data_size = sizeof(AVPicture);
2302
                }
2303
            }
2304
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2305
        }
2306

    
2307
        input_size = buf_end - buf_ptr;
2308

    
2309
        if(avctx->debug & FF_DEBUG_STARTCODE){
2310
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2311
        }
2312

    
2313
        /* prepare data for next start code */
2314
        switch(start_code) {
2315
        case SEQ_START_CODE:
2316
            mpeg1_decode_sequence(avctx, buf_ptr,
2317
                                    input_size);
2318
            break;
2319

    
2320
        case PICTURE_START_CODE:
2321
            /* we have a complete image : we try to decompress it */
2322
            mpeg1_decode_picture(avctx,
2323
                                    buf_ptr, input_size);
2324
            break;
2325
        case EXT_START_CODE:
2326
            mpeg_decode_extension(avctx,
2327
                                    buf_ptr, input_size);
2328
            break;
2329
        case USER_START_CODE:
2330
            mpeg_decode_user_data(avctx,
2331
                                    buf_ptr, input_size);
2332
            break;
2333
        case GOP_START_CODE:
2334
            s2->first_field=0;
2335
            mpeg_decode_gop(avctx,
2336
                                    buf_ptr, input_size);
2337
            break;
2338
        default:
2339
            if (start_code >= SLICE_MIN_START_CODE &&
2340
                start_code <= SLICE_MAX_START_CODE) {
2341
                int mb_y= start_code - SLICE_MIN_START_CODE;
2342

    
2343
                if(s2->last_picture_ptr==NULL){
2344
                /* Skip B-frames if we do not have reference frames. */
2345
                    if(s2->pict_type==B_TYPE) break;
2346
                }
2347
                if(s2->next_picture_ptr==NULL){
2348
                /* Skip P-frames if we do not have reference frame no valid header. */
2349
                    if(s2->pict_type==P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2350
                }
2351
                /* Skip B-frames if we are in a hurry. */
2352
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2353
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2354
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2355
                    || avctx->skip_frame >= AVDISCARD_ALL)
2356
                    break;
2357
                /* Skip everything if we are in a hurry>=5. */
2358
                if(avctx->hurry_up>=5) break;
2359

    
2360
                if (!s->mpeg_enc_ctx_allocated) break;
2361

    
2362
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2363
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2364
                        break;
2365
                }
2366

    
2367
                if(s2->first_slice){
2368
                    s2->first_slice=0;
2369
                            if(mpeg_field_start(s2) < 0)
2370
                        return -1;
2371
                    }
2372
                if(!s2->current_picture_ptr){
2373
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2374
                    return -1;
2375
                }
2376

    
2377
                if(avctx->thread_count > 1){
2378
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2379
                    if(threshold <= mb_y){
2380
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2381

    
2382
                        thread_context->start_mb_y= mb_y;
2383
                        thread_context->end_mb_y  = s2->mb_height;
2384
                        if(s->slice_count){
2385
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2386
                            ff_update_duplicate_context(thread_context, s2);
2387
                        }
2388
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2389
                        s->slice_count++;
2390
                    }
2391
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
2392
                }else{
2393
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2394
                    emms_c();
2395

    
2396
                    if(ret < 0){
2397
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2398
                            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);
2399
                    }else{
2400
                        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);
2401
                    }
2402
                }
2403
            }
2404
            break;
2405
        }
2406
    }
2407
}
2408

    
2409
static int mpeg_decode_end(AVCodecContext *avctx)
2410
{
2411
    Mpeg1Context *s = avctx->priv_data;
2412

    
2413
    if (s->mpeg_enc_ctx_allocated)
2414
        MPV_common_end(&s->mpeg_enc_ctx);
2415
    return 0;
2416
}
2417

    
2418
AVCodec mpeg1video_decoder = {
2419
    "mpeg1video",
2420
    CODEC_TYPE_VIDEO,
2421
    CODEC_ID_MPEG1VIDEO,
2422
    sizeof(Mpeg1Context),
2423
    mpeg_decode_init,
2424
    NULL,
2425
    mpeg_decode_end,
2426
    mpeg_decode_frame,
2427
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2428
    .flush= ff_mpeg_flush,
2429
};
2430

    
2431
AVCodec mpeg2video_decoder = {
2432
    "mpeg2video",
2433
    CODEC_TYPE_VIDEO,
2434
    CODEC_ID_MPEG2VIDEO,
2435
    sizeof(Mpeg1Context),
2436
    mpeg_decode_init,
2437
    NULL,
2438
    mpeg_decode_end,
2439
    mpeg_decode_frame,
2440
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2441
    .flush= ff_mpeg_flush,
2442
};
2443

    
2444
//legacy decoder
2445
AVCodec mpegvideo_decoder = {
2446
    "mpegvideo",
2447
    CODEC_TYPE_VIDEO,
2448
    CODEC_ID_MPEG2VIDEO,
2449
    sizeof(Mpeg1Context),
2450
    mpeg_decode_init,
2451
    NULL,
2452
    mpeg_decode_end,
2453
    mpeg_decode_frame,
2454
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2455
    .flush= ff_mpeg_flush,
2456
};
2457

    
2458
#ifdef HAVE_XVMC
2459
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2460
    Mpeg1Context *s;
2461

    
2462
    if( avctx->thread_count > 1)
2463
        return -1;
2464
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2465
        return -1;
2466
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2467
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2468
    }
2469
    mpeg_decode_init(avctx);
2470
    s = avctx->priv_data;
2471

    
2472
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2473
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2474

    
2475
    return 0;
2476
}
2477

    
2478
AVCodec mpeg_xvmc_decoder = {
2479
    "mpegvideo_xvmc",
2480
    CODEC_TYPE_VIDEO,
2481
    CODEC_ID_MPEG2VIDEO_XVMC,
2482
    sizeof(Mpeg1Context),
2483
    mpeg_mc_decode_init,
2484
    NULL,
2485
    mpeg_decode_end,
2486
    mpeg_decode_frame,
2487
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2488
    .flush= ff_mpeg_flush,
2489
};
2490

    
2491
#endif
2492

    
2493
/* this is ugly i know, but the alternative is too make
2494
   hundreds of vars global and prefix them with ff_mpeg1_
2495
   which is far uglier. */
2496
#include "mdec.c"