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ffmpeg / libavcodec / mpeg12.c @ 01e795ab

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1
/*
2
 * MPEG1/2 decoder
3
 * Copyright (c) 2000,2001 Fabrice Bellard.
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

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

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

    
33
#include "mpeg12.h"
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#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);
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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
59
                                        int n);
60
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
62
                                    int n);
63
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
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static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
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static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
66
static void exchange_uv(MpegEncContext *s);
67

    
68
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
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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};
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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
            /* compute dct type */
342
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
343
                !s->frame_pred_frame_dct) {
344
                s->interlaced_dct = get_bits1(&s->gb);
345
            }
346

    
347
            if (IS_QUANT(mb_type))
348
                s->qscale = get_qscale(s);
349

    
350
            s->mv_dir = MV_DIR_FORWARD;
351
            if(s->picture_structure == PICT_FRAME)
352
                s->mv_type = MV_TYPE_16X16;
353
            else{
354
                s->mv_type = MV_TYPE_FIELD;
355
                mb_type |= MB_TYPE_INTERLACED;
356
                s->field_select[0][0]= s->picture_structure - 1;
357
            }
358
            s->last_mv[0][0][0] = 0;
359
            s->last_mv[0][0][1] = 0;
360
            s->last_mv[0][1][0] = 0;
361
            s->last_mv[0][1][1] = 0;
362
            s->mv[0][0][0] = 0;
363
            s->mv[0][0][1] = 0;
364
        }else{
365
            assert(mb_type & MB_TYPE_L0L1);
366
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
367
            /* get additional motion vector type */
368
            if (s->frame_pred_frame_dct)
369
                motion_type = MT_FRAME;
370
            else{
371
                motion_type = get_bits(&s->gb, 2);
372
            }
373

    
374
            /* compute dct type */
375
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
376
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
377
                s->interlaced_dct = get_bits1(&s->gb);
378
            }
379

    
380
            if (IS_QUANT(mb_type))
381
                s->qscale = get_qscale(s);
382

    
383
            /* motion vectors */
384
            s->mv_dir = 0;
385
            for(i=0;i<2;i++) {
386
                if (USES_LIST(mb_type, i)) {
387
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
388
                    dprintf(s->avctx, "motion_type=%d\n", motion_type);
389
                    switch(motion_type) {
390
                    case MT_FRAME: /* or MT_16X8 */
391
                        if (s->picture_structure == PICT_FRAME) {
392
                            /* MT_FRAME */
393
                            mb_type |= MB_TYPE_16x16;
394
                            s->mv_type = MV_TYPE_16X16;
395
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
396
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
397
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
398
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
399
                            /* full_pel: only for mpeg1 */
400
                            if (s->full_pel[i]){
401
                                s->mv[i][0][0] <<= 1;
402
                                s->mv[i][0][1] <<= 1;
403
                            }
404
                        } else {
405
                            /* MT_16X8 */
406
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
407
                            s->mv_type = MV_TYPE_16X8;
408
                            for(j=0;j<2;j++) {
409
                                s->field_select[i][j] = get_bits1(&s->gb);
410
                                for(k=0;k<2;k++) {
411
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
412
                                                             s->last_mv[i][j][k]);
413
                                    s->last_mv[i][j][k] = val;
414
                                    s->mv[i][j][k] = val;
415
                                }
416
                            }
417
                        }
418
                        break;
419
                    case MT_FIELD:
420
                        s->mv_type = MV_TYPE_FIELD;
421
                        if (s->picture_structure == PICT_FRAME) {
422
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
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
                        } else {
437
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
438
                            s->field_select[i][0] = get_bits1(&s->gb);
439
                            for(k=0;k<2;k++) {
440
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441
                                                         s->last_mv[i][0][k]);
442
                                s->last_mv[i][0][k] = val;
443
                                s->last_mv[i][1][k] = val;
444
                                s->mv[i][0][k] = val;
445
                            }
446
                        }
447
                        break;
448
                    case MT_DMV:
449
                        {
450
                            int dmx, dmy, mx, my, m;
451

    
452
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
453
                                                    s->last_mv[i][0][0]);
454
                            s->last_mv[i][0][0] = mx;
455
                            s->last_mv[i][1][0] = mx;
456
                            dmx = get_dmv(s);
457
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
458
                                                    s->last_mv[i][0][1] >> 1);
459
                            dmy = get_dmv(s);
460
                            s->mv_type = MV_TYPE_DMV;
461

    
462

    
463
                            s->last_mv[i][0][1] = my<<1;
464
                            s->last_mv[i][1][1] = my<<1;
465

    
466
                            s->mv[i][0][0] = mx;
467
                            s->mv[i][0][1] = my;
468
                            s->mv[i][1][0] = mx;//not used
469
                            s->mv[i][1][1] = my;//not used
470

    
471
                            if (s->picture_structure == PICT_FRAME) {
472
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
473

    
474
                                //m = 1 + 2 * s->top_field_first;
475
                                m = s->top_field_first ? 1 : 3;
476

    
477
                                /* top -> top pred */
478
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
479
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
480
                                m = 4 - m;
481
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
483
                            } else {
484
                                mb_type |= MB_TYPE_16x16;
485

    
486
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
487
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
488
                                if(s->picture_structure == PICT_TOP_FIELD)
489
                                    s->mv[i][2][1]--;
490
                                else
491
                                    s->mv[i][2][1]++;
492
                            }
493
                        }
494
                        break;
495
                    default:
496
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
497
                        return -1;
498
                    }
499
                }
500
            }
501
        }
502

    
503
        s->mb_intra = 0;
504
        if (HAS_CBP(mb_type)) {
505
            s->dsp.clear_blocks(s->block[0]);
506

    
507
            if(!s->chroma_y_shift){
508
                s->dsp.clear_blocks(s->block[6]);
509
            }
510

    
511
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
512
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
513
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
514
                return -1;
515
            }
516
            if(mb_block_count > 6){
517
                 cbp<<= mb_block_count-6;
518
                 cbp |= get_bits(&s->gb, mb_block_count-6);
519
            }
520

    
521
#ifdef HAVE_XVMC
522
            //on 1 we memcpy blocks in xvmcvideo
523
            if(s->avctx->xvmc_acceleration > 1){
524
                XVMC_pack_pblocks(s,cbp);
525
                if(s->swap_uv){
526
                    exchange_uv(s);
527
                }
528
            }
529
#endif
530

    
531
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
532
                if(s->flags2 & CODEC_FLAG2_FAST){
533
                    for(i=0;i<6;i++) {
534
                        if(cbp & 32) {
535
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
536
                        } else {
537
                            s->block_last_index[i] = -1;
538
                        }
539
                        cbp+=cbp;
540
                    }
541
                }else{
542
                    cbp<<= 12-mb_block_count;
543

    
544
                    for(i=0;i<mb_block_count;i++) {
545
                        if ( cbp & (1<<11) ) {
546
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
547
                                return -1;
548
                        } else {
549
                            s->block_last_index[i] = -1;
550
                        }
551
                        cbp+=cbp;
552
                    }
553
                }
554
            } else {
555
                if(s->flags2 & CODEC_FLAG2_FAST){
556
                    for(i=0;i<6;i++) {
557
                        if (cbp & 32) {
558
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
559
                        } else {
560
                            s->block_last_index[i] = -1;
561
                        }
562
                        cbp+=cbp;
563
                    }
564
                }else{
565
                    for(i=0;i<6;i++) {
566
                        if (cbp & 32) {
567
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
568
                                return -1;
569
                        } else {
570
                            s->block_last_index[i] = -1;
571
                        }
572
                        cbp+=cbp;
573
                    }
574
                }
575
            }
576
        }else{
577
            for(i=0;i<12;i++)
578
                s->block_last_index[i] = -1;
579
        }
580
    }
581

    
582
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
583

    
584
    return 0;
585
}
586

    
587
/* as h263, but only 17 codes */
588
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
589
{
590
    int code, sign, val, l, shift;
591

    
592
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
593
    if (code == 0) {
594
        return pred;
595
    }
596
    if (code < 0) {
597
        return 0xffff;
598
    }
599

    
600
    sign = get_bits1(&s->gb);
601
    shift = fcode - 1;
602
    val = code;
603
    if (shift) {
604
        val = (val - 1) << shift;
605
        val |= get_bits(&s->gb, shift);
606
        val++;
607
    }
608
    if (sign)
609
        val = -val;
610
    val += pred;
611

    
612
    /* modulo decoding */
613
    l= INT_BIT - 5 - shift;
614
    val = (val<<l)>>l;
615
    return val;
616
}
617

    
618
static inline int decode_dc(GetBitContext *gb, int component)
619
{
620
    int code, diff;
621

    
622
    if (component == 0) {
623
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
624
    } else {
625
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
626
    }
627
    if (code < 0){
628
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
629
        return 0xffff;
630
    }
631
    if (code == 0) {
632
        diff = 0;
633
    } else {
634
        diff = get_xbits(gb, code);
635
    }
636
    return diff;
637
}
638

    
639
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
640
                               DCTELEM *block,
641
                               int n)
642
{
643
    int level, dc, diff, i, j, run;
644
    int component;
645
    RLTable *rl = &ff_rl_mpeg1;
646
    uint8_t * const scantable= s->intra_scantable.permutated;
647
    const uint16_t *quant_matrix= s->intra_matrix;
648
    const int qscale= s->qscale;
649

    
650
    /* DC coef */
651
    component = (n <= 3 ? 0 : n - 4 + 1);
652
    diff = decode_dc(&s->gb, component);
653
    if (diff >= 0xffff)
654
        return -1;
655
    dc = s->last_dc[component];
656
    dc += diff;
657
    s->last_dc[component] = dc;
658
    block[0] = dc<<3;
659
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
660
    i = 0;
661
    {
662
        OPEN_READER(re, &s->gb);
663
        /* now quantify & encode AC coefs */
664
        for(;;) {
665
            UPDATE_CACHE(re, &s->gb);
666
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
667

    
668
            if(level == 127){
669
                break;
670
            } else if(level != 0) {
671
                i += run;
672
                j = scantable[i];
673
                level= (level*qscale*quant_matrix[j])>>4;
674
                level= (level-1)|1;
675
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
676
                LAST_SKIP_BITS(re, &s->gb, 1);
677
            } else {
678
                /* escape */
679
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
680
                UPDATE_CACHE(re, &s->gb);
681
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
682
                if (level == -128) {
683
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
684
                } else if (level == 0) {
685
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
686
                }
687
                i += run;
688
                j = scantable[i];
689
                if(level<0){
690
                    level= -level;
691
                    level= (level*qscale*quant_matrix[j])>>4;
692
                    level= (level-1)|1;
693
                    level= -level;
694
                }else{
695
                    level= (level*qscale*quant_matrix[j])>>4;
696
                    level= (level-1)|1;
697
                }
698
            }
699
            if (i > 63){
700
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
701
                return -1;
702
            }
703

    
704
            block[j] = level;
705
        }
706
        CLOSE_READER(re, &s->gb);
707
    }
708
    s->block_last_index[n] = i;
709
   return 0;
710
}
711

    
712
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
713
                               DCTELEM *block,
714
                               int n)
715
{
716
    int level, i, j, run;
717
    RLTable *rl = &ff_rl_mpeg1;
718
    uint8_t * const scantable= s->intra_scantable.permutated;
719
    const uint16_t *quant_matrix= s->inter_matrix;
720
    const int qscale= s->qscale;
721

    
722
    {
723
        OPEN_READER(re, &s->gb);
724
        i = -1;
725
        /* special case for the first coef. no need to add a second vlc table */
726
        UPDATE_CACHE(re, &s->gb);
727
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
728
            level= (3*qscale*quant_matrix[0])>>5;
729
            level= (level-1)|1;
730
            if(GET_CACHE(re, &s->gb)&0x40000000)
731
                level= -level;
732
            block[0] = level;
733
            i++;
734
            SKIP_BITS(re, &s->gb, 2);
735
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
736
                goto end;
737
        }
738

    
739
        /* now quantify & encode AC coefs */
740
        for(;;) {
741
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
742

    
743
            if(level != 0) {
744
                i += run;
745
                j = scantable[i];
746
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
747
                level= (level-1)|1;
748
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
749
                SKIP_BITS(re, &s->gb, 1);
750
            } else {
751
                /* escape */
752
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
753
                UPDATE_CACHE(re, &s->gb);
754
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
755
                if (level == -128) {
756
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
757
                } else if (level == 0) {
758
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
759
                }
760
                i += run;
761
                j = scantable[i];
762
                if(level<0){
763
                    level= -level;
764
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
765
                    level= (level-1)|1;
766
                    level= -level;
767
                }else{
768
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
769
                    level= (level-1)|1;
770
                }
771
            }
772
            if (i > 63){
773
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
774
                return -1;
775
            }
776

    
777
            block[j] = level;
778
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
779
                break;
780
            UPDATE_CACHE(re, &s->gb);
781
        }
782
end:
783
        LAST_SKIP_BITS(re, &s->gb, 2);
784
        CLOSE_READER(re, &s->gb);
785
    }
786
    s->block_last_index[n] = i;
787
    return 0;
788
}
789

    
790
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
791
{
792
    int level, i, j, run;
793
    RLTable *rl = &ff_rl_mpeg1;
794
    uint8_t * const scantable= s->intra_scantable.permutated;
795
    const int qscale= s->qscale;
796

    
797
    {
798
        OPEN_READER(re, &s->gb);
799
        i = -1;
800
        /* special case for the first coef. no need to add a second vlc table */
801
        UPDATE_CACHE(re, &s->gb);
802
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
803
            level= (3*qscale)>>1;
804
            level= (level-1)|1;
805
            if(GET_CACHE(re, &s->gb)&0x40000000)
806
                level= -level;
807
            block[0] = level;
808
            i++;
809
            SKIP_BITS(re, &s->gb, 2);
810
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
811
                goto end;
812
        }
813

    
814
        /* now quantify & encode AC coefs */
815
        for(;;) {
816
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
817

    
818
            if(level != 0) {
819
                i += run;
820
                j = scantable[i];
821
                level= ((level*2+1)*qscale)>>1;
822
                level= (level-1)|1;
823
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
824
                SKIP_BITS(re, &s->gb, 1);
825
            } else {
826
                /* escape */
827
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
828
                UPDATE_CACHE(re, &s->gb);
829
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
830
                if (level == -128) {
831
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
832
                } else if (level == 0) {
833
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
834
                }
835
                i += run;
836
                j = scantable[i];
837
                if(level<0){
838
                    level= -level;
839
                    level= ((level*2+1)*qscale)>>1;
840
                    level= (level-1)|1;
841
                    level= -level;
842
                }else{
843
                    level= ((level*2+1)*qscale)>>1;
844
                    level= (level-1)|1;
845
                }
846
            }
847

    
848
            block[j] = level;
849
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
850
                break;
851
            UPDATE_CACHE(re, &s->gb);
852
        }
853
end:
854
        LAST_SKIP_BITS(re, &s->gb, 2);
855
        CLOSE_READER(re, &s->gb);
856
    }
857
    s->block_last_index[n] = i;
858
    return 0;
859
}
860

    
861

    
862
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
863
                               DCTELEM *block,
864
                               int n)
865
{
866
    int level, i, j, run;
867
    RLTable *rl = &ff_rl_mpeg1;
868
    uint8_t * const scantable= s->intra_scantable.permutated;
869
    const uint16_t *quant_matrix;
870
    const int qscale= s->qscale;
871
    int mismatch;
872

    
873
    mismatch = 1;
874

    
875
    {
876
        OPEN_READER(re, &s->gb);
877
        i = -1;
878
        if (n < 4)
879
            quant_matrix = s->inter_matrix;
880
        else
881
            quant_matrix = s->chroma_inter_matrix;
882

    
883
        /* special case for the first coef. no need to add a second vlc table */
884
        UPDATE_CACHE(re, &s->gb);
885
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
886
            level= (3*qscale*quant_matrix[0])>>5;
887
            if(GET_CACHE(re, &s->gb)&0x40000000)
888
                level= -level;
889
            block[0] = level;
890
            mismatch ^= level;
891
            i++;
892
            SKIP_BITS(re, &s->gb, 2);
893
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
894
                goto end;
895
        }
896

    
897
        /* now quantify & encode AC coefs */
898
        for(;;) {
899
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
900

    
901
            if(level != 0) {
902
                i += run;
903
                j = scantable[i];
904
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
905
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
906
                SKIP_BITS(re, &s->gb, 1);
907
            } else {
908
                /* escape */
909
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
910
                UPDATE_CACHE(re, &s->gb);
911
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
912

    
913
                i += run;
914
                j = scantable[i];
915
                if(level<0){
916
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
917
                    level= -level;
918
                }else{
919
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
920
                }
921
            }
922
            if (i > 63){
923
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
924
                return -1;
925
            }
926

    
927
            mismatch ^= level;
928
            block[j] = level;
929
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
930
                break;
931
            UPDATE_CACHE(re, &s->gb);
932
        }
933
end:
934
        LAST_SKIP_BITS(re, &s->gb, 2);
935
        CLOSE_READER(re, &s->gb);
936
    }
937
    block[63] ^= (mismatch & 1);
938

    
939
    s->block_last_index[n] = i;
940
    return 0;
941
}
942

    
943
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
944
                               DCTELEM *block,
945
                               int n)
946
{
947
    int level, i, j, run;
948
    RLTable *rl = &ff_rl_mpeg1;
949
    uint8_t * const scantable= s->intra_scantable.permutated;
950
    const int qscale= s->qscale;
951
    OPEN_READER(re, &s->gb);
952
    i = -1;
953

    
954
    /* special case for the first coef. no need to add a second vlc table */
955
    UPDATE_CACHE(re, &s->gb);
956
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
957
        level= (3*qscale)>>1;
958
        if(GET_CACHE(re, &s->gb)&0x40000000)
959
            level= -level;
960
        block[0] = level;
961
        i++;
962
        SKIP_BITS(re, &s->gb, 2);
963
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
964
            goto end;
965
    }
966

    
967
    /* now quantify & encode AC coefs */
968
    for(;;) {
969
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
970

    
971
        if(level != 0) {
972
            i += run;
973
            j = scantable[i];
974
            level= ((level*2+1)*qscale)>>1;
975
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
976
            SKIP_BITS(re, &s->gb, 1);
977
        } else {
978
            /* escape */
979
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
980
            UPDATE_CACHE(re, &s->gb);
981
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
982

    
983
            i += run;
984
            j = scantable[i];
985
            if(level<0){
986
                level= ((-level*2+1)*qscale)>>1;
987
                level= -level;
988
            }else{
989
                level= ((level*2+1)*qscale)>>1;
990
            }
991
        }
992

    
993
        block[j] = level;
994
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
995
            break;
996
        UPDATE_CACHE(re, &s->gb);
997
    }
998
end:
999
    LAST_SKIP_BITS(re, &s->gb, 2);
1000
    CLOSE_READER(re, &s->gb);
1001
    s->block_last_index[n] = i;
1002
    return 0;
1003
}
1004

    
1005

    
1006
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1007
                               DCTELEM *block,
1008
                               int n)
1009
{
1010
    int level, dc, diff, i, j, run;
1011
    int component;
1012
    RLTable *rl;
1013
    uint8_t * const scantable= s->intra_scantable.permutated;
1014
    const uint16_t *quant_matrix;
1015
    const int qscale= s->qscale;
1016
    int mismatch;
1017

    
1018
    /* DC coef */
1019
    if (n < 4){
1020
        quant_matrix = s->intra_matrix;
1021
        component = 0;
1022
    }else{
1023
        quant_matrix = s->chroma_intra_matrix;
1024
        component = (n&1) + 1;
1025
    }
1026
    diff = decode_dc(&s->gb, component);
1027
    if (diff >= 0xffff)
1028
        return -1;
1029
    dc = s->last_dc[component];
1030
    dc += diff;
1031
    s->last_dc[component] = dc;
1032
    block[0] = dc << (3 - s->intra_dc_precision);
1033
    dprintf(s->avctx, "dc=%d\n", block[0]);
1034
    mismatch = block[0] ^ 1;
1035
    i = 0;
1036
    if (s->intra_vlc_format)
1037
        rl = &ff_rl_mpeg2;
1038
    else
1039
        rl = &ff_rl_mpeg1;
1040

    
1041
    {
1042
        OPEN_READER(re, &s->gb);
1043
        /* now quantify & encode AC coefs */
1044
        for(;;) {
1045
            UPDATE_CACHE(re, &s->gb);
1046
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1047

    
1048
            if(level == 127){
1049
                break;
1050
            } else if(level != 0) {
1051
                i += run;
1052
                j = scantable[i];
1053
                level= (level*qscale*quant_matrix[j])>>4;
1054
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1055
                LAST_SKIP_BITS(re, &s->gb, 1);
1056
            } else {
1057
                /* escape */
1058
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1059
                UPDATE_CACHE(re, &s->gb);
1060
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1061
                i += run;
1062
                j = scantable[i];
1063
                if(level<0){
1064
                    level= (-level*qscale*quant_matrix[j])>>4;
1065
                    level= -level;
1066
                }else{
1067
                    level= (level*qscale*quant_matrix[j])>>4;
1068
                }
1069
            }
1070
            if (i > 63){
1071
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1072
                return -1;
1073
            }
1074

    
1075
            mismatch^= level;
1076
            block[j] = level;
1077
        }
1078
        CLOSE_READER(re, &s->gb);
1079
    }
1080
    block[63]^= mismatch&1;
1081

    
1082
    s->block_last_index[n] = i;
1083
    return 0;
1084
}
1085

    
1086
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1087
                               DCTELEM *block,
1088
                               int n)
1089
{
1090
    int level, dc, diff, j, run;
1091
    int component;
1092
    RLTable *rl;
1093
    uint8_t * scantable= s->intra_scantable.permutated;
1094
    const uint16_t *quant_matrix;
1095
    const int qscale= s->qscale;
1096

    
1097
    /* DC coef */
1098
    if (n < 4){
1099
        quant_matrix = s->intra_matrix;
1100
        component = 0;
1101
    }else{
1102
        quant_matrix = s->chroma_intra_matrix;
1103
        component = (n&1) + 1;
1104
    }
1105
    diff = decode_dc(&s->gb, component);
1106
    if (diff >= 0xffff)
1107
        return -1;
1108
    dc = s->last_dc[component];
1109
    dc += diff;
1110
    s->last_dc[component] = dc;
1111
    block[0] = dc << (3 - s->intra_dc_precision);
1112
    if (s->intra_vlc_format)
1113
        rl = &ff_rl_mpeg2;
1114
    else
1115
        rl = &ff_rl_mpeg1;
1116

    
1117
    {
1118
        OPEN_READER(re, &s->gb);
1119
        /* now quantify & encode AC coefs */
1120
        for(;;) {
1121
            UPDATE_CACHE(re, &s->gb);
1122
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1123

    
1124
            if(level == 127){
1125
                break;
1126
            } else if(level != 0) {
1127
                scantable += run;
1128
                j = *scantable;
1129
                level= (level*qscale*quant_matrix[j])>>4;
1130
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1131
                LAST_SKIP_BITS(re, &s->gb, 1);
1132
            } else {
1133
                /* escape */
1134
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1135
                UPDATE_CACHE(re, &s->gb);
1136
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1137
                scantable += run;
1138
                j = *scantable;
1139
                if(level<0){
1140
                    level= (-level*qscale*quant_matrix[j])>>4;
1141
                    level= -level;
1142
                }else{
1143
                    level= (level*qscale*quant_matrix[j])>>4;
1144
                }
1145
            }
1146

    
1147
            block[j] = level;
1148
        }
1149
        CLOSE_READER(re, &s->gb);
1150
    }
1151

    
1152
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1153
    return 0;
1154
}
1155

    
1156
typedef struct Mpeg1Context {
1157
    MpegEncContext mpeg_enc_ctx;
1158
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1159
    int repeat_field; /* true if we must repeat the field */
1160
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1161
    int slice_count;
1162
    int swap_uv;//indicate VCR2
1163
    int save_aspect_info;
1164
    int save_width, save_height;
1165
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1166

    
1167
} Mpeg1Context;
1168

    
1169
static int mpeg_decode_init(AVCodecContext *avctx)
1170
{
1171
    Mpeg1Context *s = avctx->priv_data;
1172
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1173
    int i;
1174

    
1175
    //we need some parmutation to store
1176
    //matrixes, until MPV_common_init()
1177
    //set the real permutatuon
1178
    for(i=0;i<64;i++)
1179
       s2->dsp.idct_permutation[i]=i;
1180

    
1181
    MPV_decode_defaults(s2);
1182

    
1183
    s->mpeg_enc_ctx.avctx= avctx;
1184
    s->mpeg_enc_ctx.flags= avctx->flags;
1185
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1186
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1187
    init_vlcs();
1188

    
1189
    s->mpeg_enc_ctx_allocated = 0;
1190
    s->mpeg_enc_ctx.picture_number = 0;
1191
    s->repeat_field = 0;
1192
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1193
    return 0;
1194
}
1195

    
1196
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1197
                                     const uint8_t *new_perm){
1198
    uint16_t temp_matrix[64];
1199
    int i;
1200

    
1201
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1202

    
1203
    for(i=0;i<64;i++){
1204
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1205
    }
1206
}
1207

    
1208
//Call this function when we know all parameters
1209
//it may be called in different places for mpeg1 and mpeg2
1210
static int mpeg_decode_postinit(AVCodecContext *avctx){
1211
    Mpeg1Context *s1 = avctx->priv_data;
1212
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1213
    uint8_t old_permutation[64];
1214

    
1215
    if (
1216
        (s1->mpeg_enc_ctx_allocated == 0)||
1217
        avctx->coded_width  != s->width ||
1218
        avctx->coded_height != s->height||
1219
        s1->save_width != s->width ||
1220
        s1->save_height != s->height ||
1221
        s1->save_aspect_info != s->aspect_ratio_info||
1222
        0)
1223
    {
1224

    
1225
        if (s1->mpeg_enc_ctx_allocated) {
1226
            ParseContext pc= s->parse_context;
1227
            s->parse_context.buffer=0;
1228
            MPV_common_end(s);
1229
            s->parse_context= pc;
1230
        }
1231

    
1232
        if( (s->width == 0 )||(s->height == 0))
1233
            return -2;
1234

    
1235
        avcodec_set_dimensions(avctx, s->width, s->height);
1236
        avctx->bit_rate = s->bit_rate;
1237
        s1->save_aspect_info = s->aspect_ratio_info;
1238
        s1->save_width = s->width;
1239
        s1->save_height = s->height;
1240

    
1241
     //low_delay may be forced, in this case we will have B frames
1242
     //that behave like P frames
1243
        avctx->has_b_frames = !(s->low_delay);
1244

    
1245
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1246
            //mpeg1 fps
1247
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1248
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1249
            //mpeg1 aspect
1250
            avctx->sample_aspect_ratio= av_d2q(
1251
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1252

    
1253
        }else{//mpeg2
1254
        //mpeg2 fps
1255
            av_reduce(
1256
                &s->avctx->time_base.den,
1257
                &s->avctx->time_base.num,
1258
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1259
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1260
                1<<30);
1261
        //mpeg2 aspect
1262
            if(s->aspect_ratio_info > 1){
1263
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1264
                    s->avctx->sample_aspect_ratio=
1265
                        av_div_q(
1266
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1267
                         (AVRational){s->width, s->height}
1268
                         );
1269
                }else{
1270
                    s->avctx->sample_aspect_ratio=
1271
                        av_div_q(
1272
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1273
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1274
                        );
1275
                }
1276
            }else{
1277
                s->avctx->sample_aspect_ratio=
1278
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1279
            }
1280
        }//mpeg2
1281

    
1282
        if(avctx->xvmc_acceleration){
1283
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1284
        }else{
1285
            if(s->chroma_format <  2){
1286
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1287
            }else
1288
            if(s->chroma_format == 2){
1289
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1290
            }else
1291
            if(s->chroma_format >  2){
1292
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1293
            }
1294
        }
1295
        //until then pix_fmt may be changed right after codec init
1296
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1297
            if( avctx->idct_algo == FF_IDCT_AUTO )
1298
                avctx->idct_algo = FF_IDCT_SIMPLE;
1299

    
1300
        //quantization matrixes may need reordering
1301
        //if dct permutation is changed
1302
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1303

    
1304
        if (MPV_common_init(s) < 0)
1305
            return -2;
1306

    
1307
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1308
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1309
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1310
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1311

    
1312
        s1->mpeg_enc_ctx_allocated = 1;
1313
    }
1314
    return 0;
1315
}
1316

    
1317
static int mpeg1_decode_picture(AVCodecContext *avctx,
1318
                                const uint8_t *buf, int buf_size)
1319
{
1320
    Mpeg1Context *s1 = avctx->priv_data;
1321
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1322
    int ref, f_code, vbv_delay;
1323

    
1324
    if(mpeg_decode_postinit(s->avctx) < 0)
1325
       return -2;
1326

    
1327
    init_get_bits(&s->gb, buf, buf_size*8);
1328

    
1329
    ref = get_bits(&s->gb, 10); /* temporal ref */
1330
    s->pict_type = get_bits(&s->gb, 3);
1331
    if(s->pict_type == 0 || s->pict_type > 3)
1332
        return -1;
1333

    
1334
    vbv_delay= get_bits(&s->gb, 16);
1335
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1336
        s->full_pel[0] = get_bits1(&s->gb);
1337
        f_code = get_bits(&s->gb, 3);
1338
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1339
            return -1;
1340
        s->mpeg_f_code[0][0] = f_code;
1341
        s->mpeg_f_code[0][1] = f_code;
1342
    }
1343
    if (s->pict_type == B_TYPE) {
1344
        s->full_pel[1] = get_bits1(&s->gb);
1345
        f_code = get_bits(&s->gb, 3);
1346
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1347
            return -1;
1348
        s->mpeg_f_code[1][0] = f_code;
1349
        s->mpeg_f_code[1][1] = f_code;
1350
    }
1351
    s->current_picture.pict_type= s->pict_type;
1352
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1353

    
1354
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1355
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1356

    
1357
    s->y_dc_scale = 8;
1358
    s->c_dc_scale = 8;
1359
    s->first_slice = 1;
1360
    return 0;
1361
}
1362

    
1363
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1364
{
1365
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1366
    int horiz_size_ext, vert_size_ext;
1367
    int bit_rate_ext;
1368

    
1369
    skip_bits(&s->gb, 1); /* profil and level esc*/
1370
    s->avctx->profile= get_bits(&s->gb, 3);
1371
    s->avctx->level= get_bits(&s->gb, 4);
1372
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1373
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1374
    horiz_size_ext = get_bits(&s->gb, 2);
1375
    vert_size_ext = get_bits(&s->gb, 2);
1376
    s->width |= (horiz_size_ext << 12);
1377
    s->height |= (vert_size_ext << 12);
1378
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1379
    s->bit_rate += (bit_rate_ext << 18) * 400;
1380
    skip_bits1(&s->gb); /* marker */
1381
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1382

    
1383
    s->low_delay = get_bits1(&s->gb);
1384
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1385

    
1386
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1387
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1388

    
1389
    dprintf(s->avctx, "sequence extension\n");
1390
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1391
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1392

    
1393
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1394
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1395
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1396

    
1397
}
1398

    
1399
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1400
{
1401
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1402
    int color_description, w, h;
1403

    
1404
    skip_bits(&s->gb, 3); /* video format */
1405
    color_description= get_bits1(&s->gb);
1406
    if(color_description){
1407
        skip_bits(&s->gb, 8); /* color primaries */
1408
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1409
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1410
    }
1411
    w= get_bits(&s->gb, 14);
1412
    skip_bits(&s->gb, 1); //marker
1413
    h= get_bits(&s->gb, 14);
1414
    skip_bits(&s->gb, 1); //marker
1415

    
1416
    s1->pan_scan.width= 16*w;
1417
    s1->pan_scan.height=16*h;
1418

    
1419
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1420
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1421
}
1422

    
1423
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1424
{
1425
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1426
    int i,nofco;
1427

    
1428
    nofco = 1;
1429
    if(s->progressive_sequence){
1430
        if(s->repeat_first_field){
1431
            nofco++;
1432
            if(s->top_field_first)
1433
                nofco++;
1434
        }
1435
    }else{
1436
        if(s->picture_structure == PICT_FRAME){
1437
            nofco++;
1438
            if(s->repeat_first_field)
1439
                nofco++;
1440
        }
1441
    }
1442
    for(i=0; i<nofco; i++){
1443
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1444
        skip_bits(&s->gb, 1); //marker
1445
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1446
        skip_bits(&s->gb, 1); //marker
1447
    }
1448

    
1449
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1450
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1451
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1452
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1453
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1454
        );
1455
}
1456

    
1457
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1458
{
1459
    int i, v, j;
1460

    
1461
    dprintf(s->avctx, "matrix extension\n");
1462

    
1463
    if (get_bits1(&s->gb)) {
1464
        for(i=0;i<64;i++) {
1465
            v = get_bits(&s->gb, 8);
1466
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1467
            s->intra_matrix[j] = v;
1468
            s->chroma_intra_matrix[j] = v;
1469
        }
1470
    }
1471
    if (get_bits1(&s->gb)) {
1472
        for(i=0;i<64;i++) {
1473
            v = get_bits(&s->gb, 8);
1474
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1475
            s->inter_matrix[j] = v;
1476
            s->chroma_inter_matrix[j] = v;
1477
        }
1478
    }
1479
    if (get_bits1(&s->gb)) {
1480
        for(i=0;i<64;i++) {
1481
            v = get_bits(&s->gb, 8);
1482
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1483
            s->chroma_intra_matrix[j] = v;
1484
        }
1485
    }
1486
    if (get_bits1(&s->gb)) {
1487
        for(i=0;i<64;i++) {
1488
            v = get_bits(&s->gb, 8);
1489
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1490
            s->chroma_inter_matrix[j] = v;
1491
        }
1492
    }
1493
}
1494

    
1495
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1496
{
1497
    s->full_pel[0] = s->full_pel[1] = 0;
1498
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1499
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1500
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1501
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1502
    s->intra_dc_precision = get_bits(&s->gb, 2);
1503
    s->picture_structure = get_bits(&s->gb, 2);
1504
    s->top_field_first = get_bits1(&s->gb);
1505
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1506
    s->concealment_motion_vectors = get_bits1(&s->gb);
1507
    s->q_scale_type = get_bits1(&s->gb);
1508
    s->intra_vlc_format = get_bits1(&s->gb);
1509
    s->alternate_scan = get_bits1(&s->gb);
1510
    s->repeat_first_field = get_bits1(&s->gb);
1511
    s->chroma_420_type = get_bits1(&s->gb);
1512
    s->progressive_frame = get_bits1(&s->gb);
1513

    
1514
    if(s->picture_structure == PICT_FRAME){
1515
        s->first_field=0;
1516
        s->v_edge_pos= 16*s->mb_height;
1517
    }else{
1518
        s->first_field ^= 1;
1519
        s->v_edge_pos=  8*s->mb_height;
1520
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1521
    }
1522

    
1523
    if(s->alternate_scan){
1524
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1525
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1526
    }else{
1527
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1528
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1529
    }
1530

    
1531
    /* composite display not parsed */
1532
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1533
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1534
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1535
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1536
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1537
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1538
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1539
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1540
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1541
}
1542

    
1543
static void mpeg_decode_extension(AVCodecContext *avctx,
1544
                                  const uint8_t *buf, int buf_size)
1545
{
1546
    Mpeg1Context *s1 = avctx->priv_data;
1547
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1548
    int ext_type;
1549

    
1550
    init_get_bits(&s->gb, buf, buf_size*8);
1551

    
1552
    ext_type = get_bits(&s->gb, 4);
1553
    switch(ext_type) {
1554
    case 0x1:
1555
        mpeg_decode_sequence_extension(s1);
1556
        break;
1557
    case 0x2:
1558
        mpeg_decode_sequence_display_extension(s1);
1559
        break;
1560
    case 0x3:
1561
        mpeg_decode_quant_matrix_extension(s);
1562
        break;
1563
    case 0x7:
1564
        mpeg_decode_picture_display_extension(s1);
1565
        break;
1566
    case 0x8:
1567
        mpeg_decode_picture_coding_extension(s);
1568
        break;
1569
    }
1570
}
1571

    
1572
static void exchange_uv(MpegEncContext *s){
1573
    short * tmp = s->pblocks[4];
1574
    s->pblocks[4] = s->pblocks[5];
1575
    s->pblocks[5] = tmp;
1576
}
1577

    
1578
static int mpeg_field_start(MpegEncContext *s){
1579
    AVCodecContext *avctx= s->avctx;
1580
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1581

    
1582
    /* start frame decoding */
1583
    if(s->first_field || s->picture_structure==PICT_FRAME){
1584
        if(MPV_frame_start(s, avctx) < 0)
1585
            return -1;
1586

    
1587
        ff_er_frame_start(s);
1588

    
1589
        /* first check if we must repeat the frame */
1590
        s->current_picture_ptr->repeat_pict = 0;
1591
        if (s->repeat_first_field) {
1592
            if (s->progressive_sequence) {
1593
                if (s->top_field_first)
1594
                    s->current_picture_ptr->repeat_pict = 4;
1595
                else
1596
                    s->current_picture_ptr->repeat_pict = 2;
1597
            } else if (s->progressive_frame) {
1598
                s->current_picture_ptr->repeat_pict = 1;
1599
            }
1600
        }
1601

    
1602
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1603
    }else{ //second field
1604
            int i;
1605

    
1606
            if(!s->current_picture_ptr){
1607
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1608
                return -1;
1609
            }
1610

    
1611
            for(i=0; i<4; i++){
1612
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1613
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1614
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1615
                }
1616
            }
1617
    }
1618
#ifdef HAVE_XVMC
1619
// MPV_frame_start will call this function too,
1620
// but we need to call it on every field
1621
    if(s->avctx->xvmc_acceleration)
1622
         XVMC_field_start(s,avctx);
1623
#endif
1624

    
1625
    return 0;
1626
}
1627

    
1628
#define DECODE_SLICE_ERROR -1
1629
#define DECODE_SLICE_OK 0
1630

    
1631
/**
1632
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1633
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1634
 *         DECODE_SLICE_OK if this slice is ok<br>
1635
 */
1636
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1637
                             const uint8_t **buf, int buf_size)
1638
{
1639
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1640
    AVCodecContext *avctx= s->avctx;
1641
    const int field_pic= s->picture_structure != PICT_FRAME;
1642
    const int lowres= s->avctx->lowres;
1643

    
1644
    s->resync_mb_x=
1645
    s->resync_mb_y= -1;
1646

    
1647
    if (mb_y<<field_pic >= s->mb_height){
1648
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1649
        return -1;
1650
    }
1651

    
1652
    init_get_bits(&s->gb, *buf, buf_size*8);
1653

    
1654
    ff_mpeg1_clean_buffers(s);
1655
    s->interlaced_dct = 0;
1656

    
1657
    s->qscale = get_qscale(s);
1658

    
1659
    if(s->qscale == 0){
1660
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1661
        return -1;
1662
    }
1663

    
1664
    /* extra slice info */
1665
    while (get_bits1(&s->gb) != 0) {
1666
        skip_bits(&s->gb, 8);
1667
    }
1668

    
1669
    s->mb_x=0;
1670

    
1671
    for(;;) {
1672
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1673
        if (code < 0){
1674
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1675
            return -1;
1676
        }
1677
        if (code >= 33) {
1678
            if (code == 33) {
1679
                s->mb_x += 33;
1680
            }
1681
            /* otherwise, stuffing, nothing to do */
1682
        } else {
1683
            s->mb_x += code;
1684
            break;
1685
        }
1686
    }
1687
    if(s->mb_x >= (unsigned)s->mb_width){
1688
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1689
        return -1;
1690
    }
1691

    
1692
    s->resync_mb_x= s->mb_x;
1693
    s->resync_mb_y= s->mb_y= mb_y;
1694
    s->mb_skip_run= 0;
1695
    ff_init_block_index(s);
1696

    
1697
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1698
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1699
             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",
1700
                 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],
1701
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1702
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1703
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1704
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1705
        }
1706
    }
1707

    
1708
    for(;;) {
1709
#ifdef HAVE_XVMC
1710
        //one 1 we memcpy blocks in xvmcvideo
1711
        if(s->avctx->xvmc_acceleration > 1)
1712
            XVMC_init_block(s);//set s->block
1713
#endif
1714

    
1715
        if(mpeg_decode_mb(s, s->block) < 0)
1716
            return -1;
1717

    
1718
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1719
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1720
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1721
            int motion_x, motion_y, dir, i;
1722
            if(field_pic && !s->first_field)
1723
                xy += wrap/2;
1724

    
1725
            for(i=0; i<2; i++){
1726
                for(dir=0; dir<2; dir++){
1727
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1728
                        motion_x = motion_y = 0;
1729
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1730
                        motion_x = s->mv[dir][0][0];
1731
                        motion_y = s->mv[dir][0][1];
1732
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1733
                        motion_x = s->mv[dir][i][0];
1734
                        motion_y = s->mv[dir][i][1];
1735
                    }
1736

    
1737
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1738
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1739
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1740
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1741
                    s->current_picture.ref_index [dir][xy    ]=
1742
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1743
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1744
                }
1745
                xy += wrap;
1746
            }
1747
        }
1748

    
1749
        s->dest[0] += 16 >> lowres;
1750
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1751
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1752

    
1753
        MPV_decode_mb(s, s->block);
1754

    
1755
        if (++s->mb_x >= s->mb_width) {
1756
            const int mb_size= 16>>s->avctx->lowres;
1757

    
1758
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1759

    
1760
            s->mb_x = 0;
1761
            s->mb_y++;
1762

    
1763
            if(s->mb_y<<field_pic >= s->mb_height){
1764
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1765
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1766
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1767
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1768

    
1769
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1770
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1771
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1772
                    return -1;
1773
                }else
1774
                    goto eos;
1775
            }
1776

    
1777
            ff_init_block_index(s);
1778
        }
1779

    
1780
        /* skip mb handling */
1781
        if (s->mb_skip_run == -1) {
1782
            /* read again increment */
1783
            s->mb_skip_run = 0;
1784
            for(;;) {
1785
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1786
                if (code < 0){
1787
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1788
                    return -1;
1789
                }
1790
                if (code >= 33) {
1791
                    if (code == 33) {
1792
                        s->mb_skip_run += 33;
1793
                    }else if(code == 35){
1794
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1795
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1796
                            return -1;
1797
                        }
1798
                        goto eos; /* end of slice */
1799
                    }
1800
                    /* otherwise, stuffing, nothing to do */
1801
                } else {
1802
                    s->mb_skip_run += code;
1803
                    break;
1804
                }
1805
            }
1806
            if(s->mb_skip_run){
1807
                int i;
1808
                if(s->pict_type == I_TYPE){
1809
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1810
                    return -1;
1811
                }
1812

    
1813
                /* skip mb */
1814
                s->mb_intra = 0;
1815
                for(i=0;i<12;i++)
1816
                    s->block_last_index[i] = -1;
1817
                if(s->picture_structure == PICT_FRAME)
1818
                    s->mv_type = MV_TYPE_16X16;
1819
                else
1820
                    s->mv_type = MV_TYPE_FIELD;
1821
                if (s->pict_type == P_TYPE) {
1822
                    /* if P type, zero motion vector is implied */
1823
                    s->mv_dir = MV_DIR_FORWARD;
1824
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1825
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1826
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1827
                    s->field_select[0][0]= s->picture_structure - 1;
1828
                } else {
1829
                    /* if B type, reuse previous vectors and directions */
1830
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1831
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1832
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1833
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1834
                }
1835
            }
1836
        }
1837
    }
1838
eos: // end of slice
1839
    *buf += get_bits_count(&s->gb)/8 - 1;
1840
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1841
    return 0;
1842
}
1843

    
1844
static int slice_decode_thread(AVCodecContext *c, void *arg){
1845
    MpegEncContext *s= arg;
1846
    const uint8_t *buf= s->gb.buffer;
1847
    int mb_y= s->start_mb_y;
1848

    
1849
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1850

    
1851
    for(;;){
1852
        uint32_t start_code;
1853
        int ret;
1854

    
1855
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1856
        emms_c();
1857
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1858
//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);
1859
        if(ret < 0){
1860
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1861
                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);
1862
        }else{
1863
            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);
1864
        }
1865

    
1866
        if(s->mb_y == s->end_mb_y)
1867
            return 0;
1868

    
1869
        start_code= -1;
1870
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1871
        mb_y= start_code - SLICE_MIN_START_CODE;
1872
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1873
            return -1;
1874
    }
1875

    
1876
    return 0; //not reached
1877
}
1878

    
1879
/**
1880
 * handles slice ends.
1881
 * @return 1 if it seems to be the last slice of
1882
 */
1883
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1884
{
1885
    Mpeg1Context *s1 = avctx->priv_data;
1886
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1887

    
1888
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1889
        return 0;
1890

    
1891
#ifdef HAVE_XVMC
1892
    if(s->avctx->xvmc_acceleration)
1893
        XVMC_field_end(s);
1894
#endif
1895
    /* end of slice reached */
1896
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1897
        /* end of image */
1898

    
1899
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1900

    
1901
        ff_er_frame_end(s);
1902

    
1903
        MPV_frame_end(s);
1904

    
1905
        if (s->pict_type == B_TYPE || s->low_delay) {
1906
            *pict= *(AVFrame*)s->current_picture_ptr;
1907
            ff_print_debug_info(s, pict);
1908
        } else {
1909
            s->picture_number++;
1910
            /* latency of 1 frame for I and P frames */
1911
            /* XXX: use another variable than picture_number */
1912
            if (s->last_picture_ptr != NULL) {
1913
                *pict= *(AVFrame*)s->last_picture_ptr;
1914
                 ff_print_debug_info(s, pict);
1915
            }
1916
        }
1917

    
1918
        return 1;
1919
    } else {
1920
        return 0;
1921
    }
1922
}
1923

    
1924
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1925
                                 const uint8_t *buf, int buf_size)
1926
{
1927
    Mpeg1Context *s1 = avctx->priv_data;
1928
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1929
    int width,height;
1930
    int i, v, j;
1931

    
1932
    init_get_bits(&s->gb, buf, buf_size*8);
1933

    
1934
    width = get_bits(&s->gb, 12);
1935
    height = get_bits(&s->gb, 12);
1936
    if (width <= 0 || height <= 0 ||
1937
        (width % 2) != 0 || (height % 2) != 0)
1938
        return -1;
1939
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1940
    if (s->aspect_ratio_info == 0)
1941
        return -1;
1942
    s->frame_rate_index = get_bits(&s->gb, 4);
1943
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1944
        return -1;
1945
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1946
    if (get_bits1(&s->gb) == 0) /* marker */
1947
        return -1;
1948
    s->width = width;
1949
    s->height = height;
1950

    
1951
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1952
    skip_bits(&s->gb, 1);
1953

    
1954
    /* get matrix */
1955
    if (get_bits1(&s->gb)) {
1956
        for(i=0;i<64;i++) {
1957
            v = get_bits(&s->gb, 8);
1958
            if(v==0){
1959
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1960
                return -1;
1961
            }
1962
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1963
            s->intra_matrix[j] = v;
1964
            s->chroma_intra_matrix[j] = v;
1965
        }
1966
#ifdef DEBUG
1967
        dprintf(s->avctx, "intra matrix present\n");
1968
        for(i=0;i<64;i++)
1969
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1970
        dprintf(s->avctx, "\n");
1971
#endif
1972
    } else {
1973
        for(i=0;i<64;i++) {
1974
            j = s->dsp.idct_permutation[i];
1975
            v = ff_mpeg1_default_intra_matrix[i];
1976
            s->intra_matrix[j] = v;
1977
            s->chroma_intra_matrix[j] = v;
1978
        }
1979
    }
1980
    if (get_bits1(&s->gb)) {
1981
        for(i=0;i<64;i++) {
1982
            v = get_bits(&s->gb, 8);
1983
            if(v==0){
1984
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1985
                return -1;
1986
            }
1987
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1988
            s->inter_matrix[j] = v;
1989
            s->chroma_inter_matrix[j] = v;
1990
        }
1991
#ifdef DEBUG
1992
        dprintf(s->avctx, "non intra matrix present\n");
1993
        for(i=0;i<64;i++)
1994
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1995
        dprintf(s->avctx, "\n");
1996
#endif
1997
    } else {
1998
        for(i=0;i<64;i++) {
1999
            int j= s->dsp.idct_permutation[i];
2000
            v = ff_mpeg1_default_non_intra_matrix[i];
2001
            s->inter_matrix[j] = v;
2002
            s->chroma_inter_matrix[j] = v;
2003
        }
2004
    }
2005

    
2006
    if(show_bits(&s->gb, 23) != 0){
2007
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2008
        return -1;
2009
    }
2010

    
2011
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2012
    s->progressive_sequence = 1;
2013
    s->progressive_frame = 1;
2014
    s->picture_structure = PICT_FRAME;
2015
    s->frame_pred_frame_dct = 1;
2016
    s->chroma_format = 1;
2017
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2018
    avctx->sub_id = 1; /* indicates mpeg1 */
2019
    s->out_format = FMT_MPEG1;
2020
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2021
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2022

    
2023
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2024
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2025
               s->avctx->rc_buffer_size, s->bit_rate);
2026

    
2027
    return 0;
2028
}
2029

    
2030
static int vcr2_init_sequence(AVCodecContext *avctx)
2031
{
2032
    Mpeg1Context *s1 = avctx->priv_data;
2033
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2034
    int i, v;
2035

    
2036
    /* start new mpeg1 context decoding */
2037
    s->out_format = FMT_MPEG1;
2038
    if (s1->mpeg_enc_ctx_allocated) {
2039
        MPV_common_end(s);
2040
    }
2041
    s->width  = avctx->coded_width;
2042
    s->height = avctx->coded_height;
2043
    avctx->has_b_frames= 0; //true?
2044
    s->low_delay= 1;
2045

    
2046
    if(avctx->xvmc_acceleration){
2047
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2048
    }else{
2049
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2050
    }
2051

    
2052
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2053
        if( avctx->idct_algo == FF_IDCT_AUTO )
2054
            avctx->idct_algo = FF_IDCT_SIMPLE;
2055

    
2056
    if (MPV_common_init(s) < 0)
2057
        return -1;
2058
    exchange_uv(s);//common init reset pblocks, so we swap them here
2059
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2060
    s1->mpeg_enc_ctx_allocated = 1;
2061

    
2062
    for(i=0;i<64;i++) {
2063
        int j= s->dsp.idct_permutation[i];
2064
        v = ff_mpeg1_default_intra_matrix[i];
2065
        s->intra_matrix[j] = v;
2066
        s->chroma_intra_matrix[j] = v;
2067

    
2068
        v = ff_mpeg1_default_non_intra_matrix[i];
2069
        s->inter_matrix[j] = v;
2070
        s->chroma_inter_matrix[j] = v;
2071
    }
2072

    
2073
    s->progressive_sequence = 1;
2074
    s->progressive_frame = 1;
2075
    s->picture_structure = PICT_FRAME;
2076
    s->frame_pred_frame_dct = 1;
2077
    s->chroma_format = 1;
2078
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2079
    avctx->sub_id = 2; /* indicates mpeg2 */
2080
    return 0;
2081
}
2082

    
2083

    
2084
static void mpeg_decode_user_data(AVCodecContext *avctx,
2085
                                  const uint8_t *buf, int buf_size)
2086
{
2087
    const uint8_t *p;
2088
    int len, flags;
2089
    p = buf;
2090
    len = buf_size;
2091

    
2092
    /* we parse the DTG active format information */
2093
    if (len >= 5 &&
2094
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2095
        flags = p[4];
2096
        p += 5;
2097
        len -= 5;
2098
        if (flags & 0x80) {
2099
            /* skip event id */
2100
            if (len < 2)
2101
                return;
2102
            p += 2;
2103
            len -= 2;
2104
        }
2105
        if (flags & 0x40) {
2106
            if (len < 1)
2107
                return;
2108
            avctx->dtg_active_format = p[0] & 0x0f;
2109
        }
2110
    }
2111
}
2112

    
2113
static void mpeg_decode_gop(AVCodecContext *avctx,
2114
                            const uint8_t *buf, int buf_size){
2115
    Mpeg1Context *s1 = avctx->priv_data;
2116
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2117

    
2118
    int drop_frame_flag;
2119
    int time_code_hours, time_code_minutes;
2120
    int time_code_seconds, time_code_pictures;
2121
    int broken_link;
2122

    
2123
    init_get_bits(&s->gb, buf, buf_size*8);
2124

    
2125
    drop_frame_flag = get_bits1(&s->gb);
2126

    
2127
    time_code_hours=get_bits(&s->gb,5);
2128
    time_code_minutes = get_bits(&s->gb,6);
2129
    skip_bits1(&s->gb);//marker bit
2130
    time_code_seconds = get_bits(&s->gb,6);
2131
    time_code_pictures = get_bits(&s->gb,6);
2132

    
2133
    /*broken_link indicate that after editing the
2134
      reference frames of the first B-Frames after GOP I-Frame
2135
      are missing (open gop)*/
2136
    broken_link = get_bits1(&s->gb);
2137

    
2138
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2139
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2140
            time_code_hours, time_code_minutes, time_code_seconds,
2141
            time_code_pictures, broken_link);
2142
}
2143
/**
2144
 * finds the end of the current frame in the bitstream.
2145
 * @return the position of the first byte of the next frame, or -1
2146
 */
2147
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2148
{
2149
    int i;
2150
    uint32_t state= pc->state;
2151

    
2152
    i=0;
2153
    if(!pc->frame_start_found){
2154
        for(i=0; i<buf_size; i++){
2155
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2156
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2157
                i++;
2158
                pc->frame_start_found=1;
2159
                break;
2160
            }
2161
        }
2162
    }
2163

    
2164
    if(pc->frame_start_found){
2165
        /* EOF considered as end of frame */
2166
        if (buf_size == 0)
2167
            return 0;
2168
        for(; i<buf_size; i++){
2169
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2170
            if((state&0xFFFFFF00) == 0x100){
2171
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2172
                    pc->frame_start_found=0;
2173
                    pc->state=-1;
2174
                    return i-3;
2175
                }
2176
            }
2177
        }
2178
    }
2179
    pc->state= state;
2180
    return END_NOT_FOUND;
2181
}
2182

    
2183
/* handle buffering and image synchronisation */
2184
static int mpeg_decode_frame(AVCodecContext *avctx,
2185
                             void *data, int *data_size,
2186
                             uint8_t *buf, int buf_size)
2187
{
2188
    Mpeg1Context *s = avctx->priv_data;
2189
    const uint8_t *buf_end;
2190
    const uint8_t *buf_ptr;
2191
    uint32_t start_code;
2192
    int ret, input_size;
2193
    AVFrame *picture = data;
2194
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2195
    dprintf(avctx, "fill_buffer\n");
2196

    
2197
    if (buf_size == 0) {
2198
        /* special case for last picture */
2199
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2200
            *picture= *(AVFrame*)s2->next_picture_ptr;
2201
            s2->next_picture_ptr= NULL;
2202

    
2203
            *data_size = sizeof(AVFrame);
2204
        }
2205
        return 0;
2206
    }
2207

    
2208
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2209
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2210

    
2211
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2212
            return buf_size;
2213
    }
2214

    
2215
    buf_ptr = buf;
2216
    buf_end = buf + buf_size;
2217

    
2218
#if 0
2219
    if (s->repeat_field % 2 == 1) {
2220
        s->repeat_field++;
2221
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2222
        //        s2->picture_number, s->repeat_field);
2223
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2224
            *data_size = sizeof(AVPicture);
2225
            goto the_end;
2226
        }
2227
    }
2228
#endif
2229

    
2230
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2231
        vcr2_init_sequence(avctx);
2232

    
2233
    s->slice_count= 0;
2234

    
2235
    for(;;) {
2236
        /* find start next code */
2237
        start_code = -1;
2238
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2239
        if (start_code > 0x1ff){
2240
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2241
                if(avctx->thread_count > 1){
2242
                    int i;
2243

    
2244
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2245
                    for(i=0; i<s->slice_count; i++)
2246
                        s2->error_count += s2->thread_context[i]->error_count;
2247
                }
2248
                if (slice_end(avctx, picture)) {
2249
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2250
                        *data_size = sizeof(AVPicture);
2251
                }
2252
            }
2253
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2254
        }
2255

    
2256
        input_size = buf_end - buf_ptr;
2257

    
2258
        if(avctx->debug & FF_DEBUG_STARTCODE){
2259
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2260
        }
2261

    
2262
        /* prepare data for next start code */
2263
        switch(start_code) {
2264
        case SEQ_START_CODE:
2265
            mpeg1_decode_sequence(avctx, buf_ptr,
2266
                                    input_size);
2267
            break;
2268

    
2269
        case PICTURE_START_CODE:
2270
            /* we have a complete image : we try to decompress it */
2271
            mpeg1_decode_picture(avctx,
2272
                                    buf_ptr, input_size);
2273
            break;
2274
        case EXT_START_CODE:
2275
            mpeg_decode_extension(avctx,
2276
                                    buf_ptr, input_size);
2277
            break;
2278
        case USER_START_CODE:
2279
            mpeg_decode_user_data(avctx,
2280
                                    buf_ptr, input_size);
2281
            break;
2282
        case GOP_START_CODE:
2283
            s2->first_field=0;
2284
            mpeg_decode_gop(avctx,
2285
                                    buf_ptr, input_size);
2286
            break;
2287
        default:
2288
            if (start_code >= SLICE_MIN_START_CODE &&
2289
                start_code <= SLICE_MAX_START_CODE) {
2290
                int mb_y= start_code - SLICE_MIN_START_CODE;
2291

    
2292
                if(s2->last_picture_ptr==NULL){
2293
                /* Skip B-frames if we do not have reference frames. */
2294
                    if(s2->pict_type==B_TYPE) break;
2295
                /* Skip P-frames if we do not have reference frame no valid header. */
2296
//                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2297
                }
2298
                /* Skip B-frames if we are in a hurry. */
2299
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2300
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2301
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2302
                    || avctx->skip_frame >= AVDISCARD_ALL)
2303
                    break;
2304
                /* Skip everything if we are in a hurry>=5. */
2305
                if(avctx->hurry_up>=5) break;
2306

    
2307
                if (!s->mpeg_enc_ctx_allocated) break;
2308

    
2309
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2310
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2311
                        break;
2312
                }
2313

    
2314
                if(s2->first_slice){
2315
                    s2->first_slice=0;
2316
                            if(mpeg_field_start(s2) < 0)
2317
                        return -1;
2318
                    }
2319
                if(!s2->current_picture_ptr){
2320
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2321
                    return -1;
2322
                }
2323

    
2324
                if(avctx->thread_count > 1){
2325
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2326
                    if(threshold <= mb_y){
2327
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2328

    
2329
                        thread_context->start_mb_y= mb_y;
2330
                        thread_context->end_mb_y  = s2->mb_height;
2331
                        if(s->slice_count){
2332
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2333
                            ff_update_duplicate_context(thread_context, s2);
2334
                        }
2335
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2336
                        s->slice_count++;
2337
                    }
2338
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
2339
                }else{
2340
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2341
                    emms_c();
2342

    
2343
                    if(ret < 0){
2344
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2345
                            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);
2346
                    }else{
2347
                        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);
2348
                    }
2349
                }
2350
            }
2351
            break;
2352
        }
2353
    }
2354
}
2355

    
2356
static int mpeg_decode_end(AVCodecContext *avctx)
2357
{
2358
    Mpeg1Context *s = avctx->priv_data;
2359

    
2360
    if (s->mpeg_enc_ctx_allocated)
2361
        MPV_common_end(&s->mpeg_enc_ctx);
2362
    return 0;
2363
}
2364

    
2365
AVCodec mpeg1video_decoder = {
2366
    "mpeg1video",
2367
    CODEC_TYPE_VIDEO,
2368
    CODEC_ID_MPEG1VIDEO,
2369
    sizeof(Mpeg1Context),
2370
    mpeg_decode_init,
2371
    NULL,
2372
    mpeg_decode_end,
2373
    mpeg_decode_frame,
2374
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2375
    .flush= ff_mpeg_flush,
2376
};
2377

    
2378
AVCodec mpeg2video_decoder = {
2379
    "mpeg2video",
2380
    CODEC_TYPE_VIDEO,
2381
    CODEC_ID_MPEG2VIDEO,
2382
    sizeof(Mpeg1Context),
2383
    mpeg_decode_init,
2384
    NULL,
2385
    mpeg_decode_end,
2386
    mpeg_decode_frame,
2387
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2388
    .flush= ff_mpeg_flush,
2389
};
2390

    
2391
//legacy decoder
2392
AVCodec mpegvideo_decoder = {
2393
    "mpegvideo",
2394
    CODEC_TYPE_VIDEO,
2395
    CODEC_ID_MPEG2VIDEO,
2396
    sizeof(Mpeg1Context),
2397
    mpeg_decode_init,
2398
    NULL,
2399
    mpeg_decode_end,
2400
    mpeg_decode_frame,
2401
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2402
    .flush= ff_mpeg_flush,
2403
};
2404

    
2405
#ifdef HAVE_XVMC
2406
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2407
    Mpeg1Context *s;
2408

    
2409
    if( avctx->thread_count > 1)
2410
        return -1;
2411
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2412
        return -1;
2413
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2414
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2415
    }
2416
    mpeg_decode_init(avctx);
2417
    s = avctx->priv_data;
2418

    
2419
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2420
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2421

    
2422
    return 0;
2423
}
2424

    
2425
AVCodec mpeg_xvmc_decoder = {
2426
    "mpegvideo_xvmc",
2427
    CODEC_TYPE_VIDEO,
2428
    CODEC_ID_MPEG2VIDEO_XVMC,
2429
    sizeof(Mpeg1Context),
2430
    mpeg_mc_decode_init,
2431
    NULL,
2432
    mpeg_decode_end,
2433
    mpeg_decode_frame,
2434
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2435
    .flush= ff_mpeg_flush,
2436
};
2437

    
2438
#endif
2439

    
2440
/* this is ugly i know, but the alternative is too make
2441
   hundreds of vars global and prefix them with ff_mpeg1_
2442
   which is far uglier. */
2443
#include "mdec.c"