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

    
23
/**
24
 * @file libavcodec/mpeg12.c
25
 * MPEG-1/2 decoder
26
 */
27

    
28
//#define DEBUG
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#include "internal.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
33

    
34
#include "mpeg12.h"
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#include "mpeg12data.h"
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#include "mpeg12decdata.h"
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#include "bytestream.h"
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#include "vdpau_internal.h"
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#include "xvmc_internal.h"
40

    
41
//#undef NDEBUG
42
//#include <assert.h>
43

    
44

    
45
#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
50

    
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
53
                              int n);
54
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
55
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
57
                                        int n);
58
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
60
                                    int n);
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static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
62
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);
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static void exchange_uv(MpegEncContext *s);
65

    
66
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
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                                           PIX_FMT_XVMC_MPEG2_IDCT,
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                                           PIX_FMT_XVMC_MPEG2_MC,
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                                           PIX_FMT_NONE};
70

    
71
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
72

    
73

    
74
#define INIT_2D_VLC_RL(rl, static_size)\
75
{\
76
    static RL_VLC_ELEM rl_vlc_table[static_size];\
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    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
78
             &rl.table_vlc[0][1], 4, 2,\
79
             &rl.table_vlc[0][0], 4, 2, static_size);\
80
\
81
    rl.rl_vlc[0]= rl_vlc_table;\
82
    init_2d_vlc_rl(&rl);\
83
}
84

    
85
static void init_2d_vlc_rl(RLTable *rl)
86
{
87
    int i;
88

    
89
    for(i=0; i<rl->vlc.table_size; i++){
90
        int code= rl->vlc.table[i][0];
91
        int len = rl->vlc.table[i][1];
92
        int level, run;
93

    
94
        if(len==0){ // illegal code
95
            run= 65;
96
            level= MAX_LEVEL;
97
        }else if(len<0){ //more bits needed
98
            run= 0;
99
            level= code;
100
        }else{
101
            if(code==rl->n){ //esc
102
                run= 65;
103
                level= 0;
104
            }else if(code==rl->n+1){ //eob
105
                run= 0;
106
                level= 127;
107
            }else{
108
                run=   rl->table_run  [code] + 1;
109
                level= rl->table_level[code];
110
            }
111
        }
112
        rl->rl_vlc[0][i].len= len;
113
        rl->rl_vlc[0][i].level= level;
114
        rl->rl_vlc[0][i].run= run;
115
    }
116
}
117

    
118
void ff_mpeg12_common_init(MpegEncContext *s)
119
{
120

    
121
    s->y_dc_scale_table=
122
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
123

    
124
}
125

    
126
void ff_mpeg1_clean_buffers(MpegEncContext *s){
127
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
128
    s->last_dc[1] = s->last_dc[0];
129
    s->last_dc[2] = s->last_dc[0];
130
    memset(s->last_mv, 0, sizeof(s->last_mv));
131
}
132

    
133

    
134
/******************************************/
135
/* decoding */
136

    
137
static VLC mv_vlc;
138
static VLC mbincr_vlc;
139
static VLC mb_ptype_vlc;
140
static VLC mb_btype_vlc;
141
static VLC mb_pat_vlc;
142

    
143
av_cold void ff_mpeg12_init_vlcs(void)
144
{
145
    static int done = 0;
146

    
147
    if (!done) {
148
        done = 1;
149

    
150
        INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
151
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
152
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
153
        INIT_VLC_STATIC(&dc_chroma_vlc,  DC_VLC_BITS, 12,
154
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
155
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
156
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
157
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
158
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
159
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
160
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
161
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
162
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
163
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
164
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
165

    
166
        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
167
                 &table_mb_ptype[0][1], 2, 1,
168
                 &table_mb_ptype[0][0], 2, 1, 64);
169
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
170
                 &table_mb_btype[0][1], 2, 1,
171
                 &table_mb_btype[0][0], 2, 1, 64);
172
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
173
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
174

    
175
        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
176
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
177
    }
178
}
179

    
180
static inline int get_dmv(MpegEncContext *s)
181
{
182
    if(get_bits1(&s->gb))
183
        return 1 - (get_bits1(&s->gb) << 1);
184
    else
185
        return 0;
186
}
187

    
188
static inline int get_qscale(MpegEncContext *s)
189
{
190
    int qscale = get_bits(&s->gb, 5);
191
    if (s->q_scale_type) {
192
        return non_linear_qscale[qscale];
193
    } else {
194
        return qscale << 1;
195
    }
196
}
197

    
198
/* motion type (for MPEG-2) */
199
#define MT_FIELD 1
200
#define MT_FRAME 2
201
#define MT_16X8  2
202
#define MT_DMV   3
203

    
204
static int mpeg_decode_mb(MpegEncContext *s,
205
                          DCTELEM block[12][64])
206
{
207
    int i, j, k, cbp, val, mb_type, motion_type;
208
    const int mb_block_count = 4 + (1<< s->chroma_format);
209

    
210
    dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
211

    
212
    assert(s->mb_skipped==0);
213

    
214
    if (s->mb_skip_run-- != 0) {
215
        if (s->pict_type == FF_P_TYPE) {
216
            s->mb_skipped = 1;
217
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
218
        } else {
219
            int mb_type;
220

    
221
            if(s->mb_x)
222
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
223
            else
224
                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
225
            if(IS_INTRA(mb_type))
226
                return -1;
227

    
228
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
229
                mb_type | MB_TYPE_SKIP;
230
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
231

    
232
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
233
                s->mb_skipped = 1;
234
        }
235

    
236
        return 0;
237
    }
238

    
239
    switch(s->pict_type) {
240
    default:
241
    case FF_I_TYPE:
242
        if (get_bits1(&s->gb) == 0) {
243
            if (get_bits1(&s->gb) == 0){
244
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
245
                return -1;
246
            }
247
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
248
        } else {
249
            mb_type = MB_TYPE_INTRA;
250
        }
251
        break;
252
    case FF_P_TYPE:
253
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
254
        if (mb_type < 0){
255
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
256
            return -1;
257
        }
258
        mb_type = ptype2mb_type[ mb_type ];
259
        break;
260
    case FF_B_TYPE:
261
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
262
        if (mb_type < 0){
263
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
264
            return -1;
265
        }
266
        mb_type = btype2mb_type[ mb_type ];
267
        break;
268
    }
269
    dprintf(s->avctx, "mb_type=%x\n", mb_type);
270
//    motion_type = 0; /* avoid warning */
271
    if (IS_INTRA(mb_type)) {
272
        s->dsp.clear_blocks(s->block[0]);
273

    
274
        if(!s->chroma_y_shift){
275
            s->dsp.clear_blocks(s->block[6]);
276
        }
277

    
278
        /* compute DCT type */
279
        if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
280
            !s->frame_pred_frame_dct) {
281
            s->interlaced_dct = get_bits1(&s->gb);
282
        }
283

    
284
        if (IS_QUANT(mb_type))
285
            s->qscale = get_qscale(s);
286

    
287
        if (s->concealment_motion_vectors) {
288
            /* just parse them */
289
            if (s->picture_structure != PICT_FRAME)
290
                skip_bits1(&s->gb); /* field select */
291

    
292
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
293
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
294
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
295
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
296

    
297
            skip_bits1(&s->gb); /* marker */
298
        }else
299
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
300
        s->mb_intra = 1;
301
        //if 1, we memcpy blocks in xvmcvideo
302
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
303
            ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
304
            if(s->swap_uv){
305
                exchange_uv(s);
306
            }
307
        }
308

    
309
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
310
            if(s->flags2 & CODEC_FLAG2_FAST){
311
                for(i=0;i<6;i++) {
312
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
313
                }
314
            }else{
315
                for(i=0;i<mb_block_count;i++) {
316
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
317
                        return -1;
318
                }
319
            }
320
        } else {
321
            for(i=0;i<6;i++) {
322
                if (ff_mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
323
                    return -1;
324
            }
325
        }
326
    } else {
327
        if (mb_type & MB_TYPE_ZERO_MV){
328
            assert(mb_type & MB_TYPE_CBP);
329

    
330
            s->mv_dir = MV_DIR_FORWARD;
331
            if(s->picture_structure == PICT_FRAME){
332
                if(!s->frame_pred_frame_dct)
333
                    s->interlaced_dct = get_bits1(&s->gb);
334
                s->mv_type = MV_TYPE_16X16;
335
            }else{
336
                s->mv_type = MV_TYPE_FIELD;
337
                mb_type |= MB_TYPE_INTERLACED;
338
                s->field_select[0][0]= s->picture_structure - 1;
339
            }
340

    
341
            if (IS_QUANT(mb_type))
342
                s->qscale = get_qscale(s);
343

    
344
            s->last_mv[0][0][0] = 0;
345
            s->last_mv[0][0][1] = 0;
346
            s->last_mv[0][1][0] = 0;
347
            s->last_mv[0][1][1] = 0;
348
            s->mv[0][0][0] = 0;
349
            s->mv[0][0][1] = 0;
350
        }else{
351
            assert(mb_type & MB_TYPE_L0L1);
352
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
353
            /* get additional motion vector type */
354
            if (s->frame_pred_frame_dct)
355
                motion_type = MT_FRAME;
356
            else{
357
                motion_type = get_bits(&s->gb, 2);
358
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
359
                    s->interlaced_dct = get_bits1(&s->gb);
360
            }
361

    
362
            if (IS_QUANT(mb_type))
363
                s->qscale = get_qscale(s);
364

    
365
            /* motion vectors */
366
            s->mv_dir= (mb_type>>13)&3;
367
            dprintf(s->avctx, "motion_type=%d\n", motion_type);
368
            switch(motion_type) {
369
            case MT_FRAME: /* or MT_16X8 */
370
                if (s->picture_structure == PICT_FRAME) {
371
                    mb_type |= MB_TYPE_16x16;
372
                    s->mv_type = MV_TYPE_16X16;
373
                    for(i=0;i<2;i++) {
374
                        if (USES_LIST(mb_type, i)) {
375
                            /* MT_FRAME */
376
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
377
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
378
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
379
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
380
                            /* full_pel: only for MPEG-1 */
381
                            if (s->full_pel[i]){
382
                                s->mv[i][0][0] <<= 1;
383
                                s->mv[i][0][1] <<= 1;
384
                            }
385
                        }
386
                    }
387
                } else {
388
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
389
                    s->mv_type = MV_TYPE_16X8;
390
                    for(i=0;i<2;i++) {
391
                        if (USES_LIST(mb_type, i)) {
392
                            /* MT_16X8 */
393
                            for(j=0;j<2;j++) {
394
                                s->field_select[i][j] = get_bits1(&s->gb);
395
                                for(k=0;k<2;k++) {
396
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
397
                                                             s->last_mv[i][j][k]);
398
                                    s->last_mv[i][j][k] = val;
399
                                    s->mv[i][j][k] = val;
400
                                }
401
                            }
402
                        }
403
                    }
404
                }
405
                break;
406
            case MT_FIELD:
407
                s->mv_type = MV_TYPE_FIELD;
408
                if (s->picture_structure == PICT_FRAME) {
409
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
410
                    for(i=0;i<2;i++) {
411
                        if (USES_LIST(mb_type, i)) {
412
                            for(j=0;j<2;j++) {
413
                                s->field_select[i][j] = get_bits1(&s->gb);
414
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
415
                                                         s->last_mv[i][j][0]);
416
                                s->last_mv[i][j][0] = val;
417
                                s->mv[i][j][0] = val;
418
                                dprintf(s->avctx, "fmx=%d\n", val);
419
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
420
                                                         s->last_mv[i][j][1] >> 1);
421
                                s->last_mv[i][j][1] = val << 1;
422
                                s->mv[i][j][1] = val;
423
                                dprintf(s->avctx, "fmy=%d\n", val);
424
                            }
425
                        }
426
                    }
427
                } else {
428
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
429
                    for(i=0;i<2;i++) {
430
                        if (USES_LIST(mb_type, i)) {
431
                            s->field_select[i][0] = get_bits1(&s->gb);
432
                            for(k=0;k<2;k++) {
433
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
434
                                                         s->last_mv[i][0][k]);
435
                                s->last_mv[i][0][k] = val;
436
                                s->last_mv[i][1][k] = val;
437
                                s->mv[i][0][k] = val;
438
                            }
439
                        }
440
                    }
441
                }
442
                break;
443
            case MT_DMV:
444
                s->mv_type = MV_TYPE_DMV;
445
                for(i=0;i<2;i++) {
446
                    if (USES_LIST(mb_type, i)) {
447
                        int dmx, dmy, mx, my, m;
448
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
449
                                                s->last_mv[i][0][0]);
450
                        s->last_mv[i][0][0] = mx;
451
                        s->last_mv[i][1][0] = mx;
452
                        dmx = get_dmv(s);
453
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
454
                                                s->last_mv[i][0][1] >> 1);
455
                        dmy = get_dmv(s);
456

    
457

    
458
                        s->last_mv[i][0][1] = my<<1;
459
                        s->last_mv[i][1][1] = my<<1;
460

    
461
                        s->mv[i][0][0] = mx;
462
                        s->mv[i][0][1] = my;
463
                        s->mv[i][1][0] = mx;//not used
464
                        s->mv[i][1][1] = my;//not used
465

    
466
                        if (s->picture_structure == PICT_FRAME) {
467
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
468

    
469
                            //m = 1 + 2 * s->top_field_first;
470
                            m = s->top_field_first ? 1 : 3;
471

    
472
                            /* top -> top pred */
473
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
474
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
475
                            m = 4 - m;
476
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
477
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
478
                        } else {
479
                            mb_type |= MB_TYPE_16x16;
480

    
481
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
482
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
483
                            if(s->picture_structure == PICT_TOP_FIELD)
484
                                s->mv[i][2][1]--;
485
                            else
486
                                s->mv[i][2][1]++;
487
                        }
488
                    }
489
                }
490
                break;
491
            default:
492
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
493
                return -1;
494
            }
495
        }
496

    
497
        s->mb_intra = 0;
498
        if (HAS_CBP(mb_type)) {
499
            s->dsp.clear_blocks(s->block[0]);
500

    
501
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
502
            if(mb_block_count > 6){
503
                 cbp<<= mb_block_count-6;
504
                 cbp |= get_bits(&s->gb, mb_block_count-6);
505
                 s->dsp.clear_blocks(s->block[6]);
506
            }
507
            if (cbp <= 0){
508
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
509
                return -1;
510
            }
511

    
512
            //if 1, we memcpy blocks in xvmcvideo
513
            if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
514
                ff_xvmc_pack_pblocks(s,cbp);
515
                if(s->swap_uv){
516
                    exchange_uv(s);
517
                }
518
            }
519

    
520
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
521
                if(s->flags2 & CODEC_FLAG2_FAST){
522
                    for(i=0;i<6;i++) {
523
                        if(cbp & 32) {
524
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
525
                        } else {
526
                            s->block_last_index[i] = -1;
527
                        }
528
                        cbp+=cbp;
529
                    }
530
                }else{
531
                    cbp<<= 12-mb_block_count;
532

    
533
                    for(i=0;i<mb_block_count;i++) {
534
                        if ( cbp & (1<<11) ) {
535
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
536
                                return -1;
537
                        } else {
538
                            s->block_last_index[i] = -1;
539
                        }
540
                        cbp+=cbp;
541
                    }
542
                }
543
            } else {
544
                if(s->flags2 & CODEC_FLAG2_FAST){
545
                    for(i=0;i<6;i++) {
546
                        if (cbp & 32) {
547
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
548
                        } else {
549
                            s->block_last_index[i] = -1;
550
                        }
551
                        cbp+=cbp;
552
                    }
553
                }else{
554
                    for(i=0;i<6;i++) {
555
                        if (cbp & 32) {
556
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
557
                                return -1;
558
                        } else {
559
                            s->block_last_index[i] = -1;
560
                        }
561
                        cbp+=cbp;
562
                    }
563
                }
564
            }
565
        }else{
566
            for(i=0;i<12;i++)
567
                s->block_last_index[i] = -1;
568
        }
569
    }
570

    
571
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
572

    
573
    return 0;
574
}
575

    
576
/* as H.263, but only 17 codes */
577
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
578
{
579
    int code, sign, val, l, shift;
580

    
581
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
582
    if (code == 0) {
583
        return pred;
584
    }
585
    if (code < 0) {
586
        return 0xffff;
587
    }
588

    
589
    sign = get_bits1(&s->gb);
590
    shift = fcode - 1;
591
    val = code;
592
    if (shift) {
593
        val = (val - 1) << shift;
594
        val |= get_bits(&s->gb, shift);
595
        val++;
596
    }
597
    if (sign)
598
        val = -val;
599
    val += pred;
600

    
601
    /* modulo decoding */
602
    l= INT_BIT - 5 - shift;
603
    val = (val<<l)>>l;
604
    return val;
605
}
606

    
607
inline int ff_mpeg1_decode_block_intra(MpegEncContext *s,
608
                               DCTELEM *block,
609
                               int n)
610
{
611
    int level, dc, diff, i, j, run;
612
    int component;
613
    RLTable *rl = &ff_rl_mpeg1;
614
    uint8_t * const scantable= s->intra_scantable.permutated;
615
    const uint16_t *quant_matrix= s->intra_matrix;
616
    const int qscale= s->qscale;
617

    
618
    /* DC coefficient */
619
    component = (n <= 3 ? 0 : n - 4 + 1);
620
    diff = decode_dc(&s->gb, component);
621
    if (diff >= 0xffff)
622
        return -1;
623
    dc = s->last_dc[component];
624
    dc += diff;
625
    s->last_dc[component] = dc;
626
    block[0] = dc*quant_matrix[0];
627
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
628
    i = 0;
629
    {
630
        OPEN_READER(re, &s->gb);
631
        /* now quantify & encode AC coefficients */
632
        for(;;) {
633
            UPDATE_CACHE(re, &s->gb);
634
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
635

    
636
            if(level == 127){
637
                break;
638
            } else if(level != 0) {
639
                i += run;
640
                j = scantable[i];
641
                level= (level*qscale*quant_matrix[j])>>4;
642
                level= (level-1)|1;
643
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
644
                LAST_SKIP_BITS(re, &s->gb, 1);
645
            } else {
646
                /* escape */
647
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
648
                UPDATE_CACHE(re, &s->gb);
649
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
650
                if (level == -128) {
651
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
652
                } else if (level == 0) {
653
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
654
                }
655
                i += run;
656
                j = scantable[i];
657
                if(level<0){
658
                    level= -level;
659
                    level= (level*qscale*quant_matrix[j])>>4;
660
                    level= (level-1)|1;
661
                    level= -level;
662
                }else{
663
                    level= (level*qscale*quant_matrix[j])>>4;
664
                    level= (level-1)|1;
665
                }
666
            }
667
            if (i > 63){
668
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
669
                return -1;
670
            }
671

    
672
            block[j] = level;
673
        }
674
        CLOSE_READER(re, &s->gb);
675
    }
676
    s->block_last_index[n] = i;
677
   return 0;
678
}
679

    
680
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
681
                               DCTELEM *block,
682
                               int n)
683
{
684
    int level, i, j, run;
685
    RLTable *rl = &ff_rl_mpeg1;
686
    uint8_t * const scantable= s->intra_scantable.permutated;
687
    const uint16_t *quant_matrix= s->inter_matrix;
688
    const int qscale= s->qscale;
689

    
690
    {
691
        OPEN_READER(re, &s->gb);
692
        i = -1;
693
        // special case for first coefficient, no need to add second VLC table
694
        UPDATE_CACHE(re, &s->gb);
695
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
696
            level= (3*qscale*quant_matrix[0])>>5;
697
            level= (level-1)|1;
698
            if(GET_CACHE(re, &s->gb)&0x40000000)
699
                level= -level;
700
            block[0] = level;
701
            i++;
702
            SKIP_BITS(re, &s->gb, 2);
703
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
704
                goto end;
705
        }
706
#if MIN_CACHE_BITS < 19
707
        UPDATE_CACHE(re, &s->gb);
708
#endif
709
        /* now quantify & encode AC coefficients */
710
        for(;;) {
711
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
712

    
713
            if(level != 0) {
714
                i += run;
715
                j = scantable[i];
716
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
717
                level= (level-1)|1;
718
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
719
                SKIP_BITS(re, &s->gb, 1);
720
            } else {
721
                /* escape */
722
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
723
                UPDATE_CACHE(re, &s->gb);
724
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
725
                if (level == -128) {
726
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
727
                } else if (level == 0) {
728
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
729
                }
730
                i += run;
731
                j = scantable[i];
732
                if(level<0){
733
                    level= -level;
734
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
735
                    level= (level-1)|1;
736
                    level= -level;
737
                }else{
738
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
739
                    level= (level-1)|1;
740
                }
741
            }
742
            if (i > 63){
743
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
744
                return -1;
745
            }
746

    
747
            block[j] = level;
748
#if MIN_CACHE_BITS < 19
749
            UPDATE_CACHE(re, &s->gb);
750
#endif
751
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
752
                break;
753
#if MIN_CACHE_BITS >= 19
754
            UPDATE_CACHE(re, &s->gb);
755
#endif
756
        }
757
end:
758
        LAST_SKIP_BITS(re, &s->gb, 2);
759
        CLOSE_READER(re, &s->gb);
760
    }
761
    s->block_last_index[n] = i;
762
    return 0;
763
}
764

    
765
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
766
{
767
    int level, i, j, run;
768
    RLTable *rl = &ff_rl_mpeg1;
769
    uint8_t * const scantable= s->intra_scantable.permutated;
770
    const int qscale= s->qscale;
771

    
772
    {
773
        OPEN_READER(re, &s->gb);
774
        i = -1;
775
        // special case for first coefficient, no need to add second VLC table
776
        UPDATE_CACHE(re, &s->gb);
777
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
778
            level= (3*qscale)>>1;
779
            level= (level-1)|1;
780
            if(GET_CACHE(re, &s->gb)&0x40000000)
781
                level= -level;
782
            block[0] = level;
783
            i++;
784
            SKIP_BITS(re, &s->gb, 2);
785
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
786
                goto end;
787
        }
788
#if MIN_CACHE_BITS < 19
789
        UPDATE_CACHE(re, &s->gb);
790
#endif
791

    
792
        /* now quantify & encode AC coefficients */
793
        for(;;) {
794
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
795

    
796
            if(level != 0) {
797
                i += run;
798
                j = scantable[i];
799
                level= ((level*2+1)*qscale)>>1;
800
                level= (level-1)|1;
801
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
802
                SKIP_BITS(re, &s->gb, 1);
803
            } else {
804
                /* escape */
805
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
806
                UPDATE_CACHE(re, &s->gb);
807
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
808
                if (level == -128) {
809
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
810
                } else if (level == 0) {
811
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
812
                }
813
                i += run;
814
                j = scantable[i];
815
                if(level<0){
816
                    level= -level;
817
                    level= ((level*2+1)*qscale)>>1;
818
                    level= (level-1)|1;
819
                    level= -level;
820
                }else{
821
                    level= ((level*2+1)*qscale)>>1;
822
                    level= (level-1)|1;
823
                }
824
            }
825

    
826
            block[j] = level;
827
#if MIN_CACHE_BITS < 19
828
            UPDATE_CACHE(re, &s->gb);
829
#endif
830
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
831
                break;
832
#if MIN_CACHE_BITS >= 19
833
            UPDATE_CACHE(re, &s->gb);
834
#endif
835
        }
836
end:
837
        LAST_SKIP_BITS(re, &s->gb, 2);
838
        CLOSE_READER(re, &s->gb);
839
    }
840
    s->block_last_index[n] = i;
841
    return 0;
842
}
843

    
844

    
845
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
846
                               DCTELEM *block,
847
                               int n)
848
{
849
    int level, i, j, run;
850
    RLTable *rl = &ff_rl_mpeg1;
851
    uint8_t * const scantable= s->intra_scantable.permutated;
852
    const uint16_t *quant_matrix;
853
    const int qscale= s->qscale;
854
    int mismatch;
855

    
856
    mismatch = 1;
857

    
858
    {
859
        OPEN_READER(re, &s->gb);
860
        i = -1;
861
        if (n < 4)
862
            quant_matrix = s->inter_matrix;
863
        else
864
            quant_matrix = s->chroma_inter_matrix;
865

    
866
        // special case for first coefficient, no need to add second VLC table
867
        UPDATE_CACHE(re, &s->gb);
868
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
869
            level= (3*qscale*quant_matrix[0])>>5;
870
            if(GET_CACHE(re, &s->gb)&0x40000000)
871
                level= -level;
872
            block[0] = level;
873
            mismatch ^= level;
874
            i++;
875
            SKIP_BITS(re, &s->gb, 2);
876
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
877
                goto end;
878
        }
879
#if MIN_CACHE_BITS < 19
880
        UPDATE_CACHE(re, &s->gb);
881
#endif
882

    
883
        /* now quantify & encode AC coefficients */
884
        for(;;) {
885
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
886

    
887
            if(level != 0) {
888
                i += run;
889
                j = scantable[i];
890
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
891
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
892
                SKIP_BITS(re, &s->gb, 1);
893
            } else {
894
                /* escape */
895
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
896
                UPDATE_CACHE(re, &s->gb);
897
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
898

    
899
                i += run;
900
                j = scantable[i];
901
                if(level<0){
902
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
903
                    level= -level;
904
                }else{
905
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
906
                }
907
            }
908
            if (i > 63){
909
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
910
                return -1;
911
            }
912

    
913
            mismatch ^= level;
914
            block[j] = level;
915
#if MIN_CACHE_BITS < 19
916
            UPDATE_CACHE(re, &s->gb);
917
#endif
918
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
919
                break;
920
#if MIN_CACHE_BITS >= 19
921
            UPDATE_CACHE(re, &s->gb);
922
#endif
923
        }
924
end:
925
        LAST_SKIP_BITS(re, &s->gb, 2);
926
        CLOSE_READER(re, &s->gb);
927
    }
928
    block[63] ^= (mismatch & 1);
929

    
930
    s->block_last_index[n] = i;
931
    return 0;
932
}
933

    
934
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
935
                               DCTELEM *block,
936
                               int n)
937
{
938
    int level, i, j, run;
939
    RLTable *rl = &ff_rl_mpeg1;
940
    uint8_t * const scantable= s->intra_scantable.permutated;
941
    const int qscale= s->qscale;
942
    OPEN_READER(re, &s->gb);
943
    i = -1;
944

    
945
    // special case for first coefficient, no need to add second VLC table
946
    UPDATE_CACHE(re, &s->gb);
947
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
948
        level= (3*qscale)>>1;
949
        if(GET_CACHE(re, &s->gb)&0x40000000)
950
            level= -level;
951
        block[0] = level;
952
        i++;
953
        SKIP_BITS(re, &s->gb, 2);
954
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
955
            goto end;
956
    }
957
#if MIN_CACHE_BITS < 19
958
    UPDATE_CACHE(re, &s->gb);
959
#endif
960

    
961
    /* now quantify & encode AC coefficients */
962
    for(;;) {
963
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
964

    
965
        if(level != 0) {
966
            i += run;
967
            j = scantable[i];
968
            level= ((level*2+1)*qscale)>>1;
969
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
970
            SKIP_BITS(re, &s->gb, 1);
971
        } else {
972
            /* escape */
973
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
974
            UPDATE_CACHE(re, &s->gb);
975
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
976

    
977
            i += run;
978
            j = scantable[i];
979
            if(level<0){
980
                level= ((-level*2+1)*qscale)>>1;
981
                level= -level;
982
            }else{
983
                level= ((level*2+1)*qscale)>>1;
984
            }
985
        }
986

    
987
        block[j] = level;
988
#if MIN_CACHE_BITS < 19
989
        UPDATE_CACHE(re, &s->gb);
990
#endif
991
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
992
            break;
993
#if MIN_CACHE_BITS >=19
994
        UPDATE_CACHE(re, &s->gb);
995
#endif
996
    }
997
end:
998
    LAST_SKIP_BITS(re, &s->gb, 2);
999
    CLOSE_READER(re, &s->gb);
1000
    s->block_last_index[n] = i;
1001
    return 0;
1002
}
1003

    
1004

    
1005
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1006
                               DCTELEM *block,
1007
                               int n)
1008
{
1009
    int level, dc, diff, i, j, run;
1010
    int component;
1011
    RLTable *rl;
1012
    uint8_t * const scantable= s->intra_scantable.permutated;
1013
    const uint16_t *quant_matrix;
1014
    const int qscale= s->qscale;
1015
    int mismatch;
1016

    
1017
    /* DC coefficient */
1018
    if (n < 4){
1019
        quant_matrix = s->intra_matrix;
1020
        component = 0;
1021
    }else{
1022
        quant_matrix = s->chroma_intra_matrix;
1023
        component = (n&1) + 1;
1024
    }
1025
    diff = decode_dc(&s->gb, component);
1026
    if (diff >= 0xffff)
1027
        return -1;
1028
    dc = s->last_dc[component];
1029
    dc += diff;
1030
    s->last_dc[component] = dc;
1031
    block[0] = dc << (3 - s->intra_dc_precision);
1032
    dprintf(s->avctx, "dc=%d\n", block[0]);
1033
    mismatch = block[0] ^ 1;
1034
    i = 0;
1035
    if (s->intra_vlc_format)
1036
        rl = &ff_rl_mpeg2;
1037
    else
1038
        rl = &ff_rl_mpeg1;
1039

    
1040
    {
1041
        OPEN_READER(re, &s->gb);
1042
        /* now quantify & encode AC coefficients */
1043
        for(;;) {
1044
            UPDATE_CACHE(re, &s->gb);
1045
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1046

    
1047
            if(level == 127){
1048
                break;
1049
            } else if(level != 0) {
1050
                i += run;
1051
                j = scantable[i];
1052
                level= (level*qscale*quant_matrix[j])>>4;
1053
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1054
                LAST_SKIP_BITS(re, &s->gb, 1);
1055
            } else {
1056
                /* escape */
1057
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1058
                UPDATE_CACHE(re, &s->gb);
1059
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1060
                i += run;
1061
                j = scantable[i];
1062
                if(level<0){
1063
                    level= (-level*qscale*quant_matrix[j])>>4;
1064
                    level= -level;
1065
                }else{
1066
                    level= (level*qscale*quant_matrix[j])>>4;
1067
                }
1068
            }
1069
            if (i > 63){
1070
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1071
                return -1;
1072
            }
1073

    
1074
            mismatch^= level;
1075
            block[j] = level;
1076
        }
1077
        CLOSE_READER(re, &s->gb);
1078
    }
1079
    block[63]^= mismatch&1;
1080

    
1081
    s->block_last_index[n] = i;
1082
    return 0;
1083
}
1084

    
1085
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1086
                               DCTELEM *block,
1087
                               int n)
1088
{
1089
    int level, dc, diff, j, run;
1090
    int component;
1091
    RLTable *rl;
1092
    uint8_t * scantable= s->intra_scantable.permutated;
1093
    const uint16_t *quant_matrix;
1094
    const int qscale= s->qscale;
1095

    
1096
    /* DC coefficient */
1097
    if (n < 4){
1098
        quant_matrix = s->intra_matrix;
1099
        component = 0;
1100
    }else{
1101
        quant_matrix = s->chroma_intra_matrix;
1102
        component = (n&1) + 1;
1103
    }
1104
    diff = decode_dc(&s->gb, component);
1105
    if (diff >= 0xffff)
1106
        return -1;
1107
    dc = s->last_dc[component];
1108
    dc += diff;
1109
    s->last_dc[component] = dc;
1110
    block[0] = dc << (3 - s->intra_dc_precision);
1111
    if (s->intra_vlc_format)
1112
        rl = &ff_rl_mpeg2;
1113
    else
1114
        rl = &ff_rl_mpeg1;
1115

    
1116
    {
1117
        OPEN_READER(re, &s->gb);
1118
        /* now quantify & encode AC coefficients */
1119
        for(;;) {
1120
            UPDATE_CACHE(re, &s->gb);
1121
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1122

    
1123
            if(level == 127){
1124
                break;
1125
            } else if(level != 0) {
1126
                scantable += run;
1127
                j = *scantable;
1128
                level= (level*qscale*quant_matrix[j])>>4;
1129
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1130
                LAST_SKIP_BITS(re, &s->gb, 1);
1131
            } else {
1132
                /* escape */
1133
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1134
                UPDATE_CACHE(re, &s->gb);
1135
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1136
                scantable += run;
1137
                j = *scantable;
1138
                if(level<0){
1139
                    level= (-level*qscale*quant_matrix[j])>>4;
1140
                    level= -level;
1141
                }else{
1142
                    level= (level*qscale*quant_matrix[j])>>4;
1143
                }
1144
            }
1145

    
1146
            block[j] = level;
1147
        }
1148
        CLOSE_READER(re, &s->gb);
1149
    }
1150

    
1151
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1152
    return 0;
1153
}
1154

    
1155
typedef struct Mpeg1Context {
1156
    MpegEncContext mpeg_enc_ctx;
1157
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1158
    int repeat_field; /* true if we must repeat the field */
1159
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1160
    int slice_count;
1161
    int swap_uv;//indicate VCR2
1162
    int save_aspect_info;
1163
    int save_width, save_height;
1164
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1165

    
1166
} Mpeg1Context;
1167

    
1168
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1169
{
1170
    Mpeg1Context *s = avctx->priv_data;
1171
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1172
    int i;
1173

    
1174
    /* we need some permutation to store matrices,
1175
     * until MPV_common_init() sets the real permutation. */
1176
    for(i=0;i<64;i++)
1177
       s2->dsp.idct_permutation[i]=i;
1178

    
1179
    MPV_decode_defaults(s2);
1180

    
1181
    s->mpeg_enc_ctx.avctx= avctx;
1182
    s->mpeg_enc_ctx.flags= avctx->flags;
1183
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1184
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1185
    ff_mpeg12_init_vlcs();
1186

    
1187
    s->mpeg_enc_ctx_allocated = 0;
1188
    s->mpeg_enc_ctx.picture_number = 0;
1189
    s->repeat_field = 0;
1190
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1191
    return 0;
1192
}
1193

    
1194
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1195
                                     const uint8_t *new_perm){
1196
    uint16_t temp_matrix[64];
1197
    int i;
1198

    
1199
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1200

    
1201
    for(i=0;i<64;i++){
1202
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1203
    }
1204
}
1205

    
1206
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1207
    Mpeg1Context *s1 = avctx->priv_data;
1208
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1209

    
1210
    if(avctx->xvmc_acceleration)
1211
        return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1212
    else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1213
        if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1214
            return PIX_FMT_VDPAU_MPEG1;
1215
        else
1216
            return PIX_FMT_VDPAU_MPEG2;
1217
    }else{
1218
        if(s->chroma_format <  2)
1219
            return avctx->get_format(avctx,ff_pixfmt_list_420);
1220
        else if(s->chroma_format == 2)
1221
            return PIX_FMT_YUV422P;
1222
        else
1223
            return PIX_FMT_YUV444P;
1224
    }
1225
}
1226

    
1227
/* Call this function when we know all parameters.
1228
 * It may be called in different places for MPEG-1 and MPEG-2. */
1229
static int mpeg_decode_postinit(AVCodecContext *avctx){
1230
    Mpeg1Context *s1 = avctx->priv_data;
1231
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1232
    uint8_t old_permutation[64];
1233

    
1234
    if (
1235
        (s1->mpeg_enc_ctx_allocated == 0)||
1236
        avctx->coded_width  != s->width ||
1237
        avctx->coded_height != s->height||
1238
        s1->save_width != s->width ||
1239
        s1->save_height != s->height ||
1240
        s1->save_aspect_info != s->aspect_ratio_info||
1241
        0)
1242
    {
1243

    
1244
        if (s1->mpeg_enc_ctx_allocated) {
1245
            ParseContext pc= s->parse_context;
1246
            s->parse_context.buffer=0;
1247
            MPV_common_end(s);
1248
            s->parse_context= pc;
1249
        }
1250

    
1251
        if( (s->width == 0 )||(s->height == 0))
1252
            return -2;
1253

    
1254
        avcodec_set_dimensions(avctx, s->width, s->height);
1255
        avctx->bit_rate = s->bit_rate;
1256
        s1->save_aspect_info = s->aspect_ratio_info;
1257
        s1->save_width = s->width;
1258
        s1->save_height = s->height;
1259

    
1260
        /* low_delay may be forced, in this case we will have B-frames
1261
         * that behave like P-frames. */
1262
        avctx->has_b_frames = !(s->low_delay);
1263

    
1264
        assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1265
        if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1266
            //MPEG-1 fps
1267
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1268
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1269
            //MPEG-1 aspect
1270
            avctx->sample_aspect_ratio= av_d2q(
1271
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1272

    
1273
        }else{//MPEG-2
1274
        //MPEG-2 fps
1275
            av_reduce(
1276
                &s->avctx->time_base.den,
1277
                &s->avctx->time_base.num,
1278
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1279
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1280
                1<<30);
1281
        //MPEG-2 aspect
1282
            if(s->aspect_ratio_info > 1){
1283
                //we ignore the spec here as reality does not match the spec, see for example
1284
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1285
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1286
                    s->avctx->sample_aspect_ratio=
1287
                        av_div_q(
1288
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1289
                         (AVRational){s->width, s->height}
1290
                         );
1291
                }else{
1292
                    s->avctx->sample_aspect_ratio=
1293
                        av_div_q(
1294
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1295
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1296
                        );
1297
                }
1298
            }else{
1299
                s->avctx->sample_aspect_ratio=
1300
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1301
            }
1302
        }//MPEG-2
1303

    
1304
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1305
        avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1306
        //until then pix_fmt may be changed right after codec init
1307
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1308
            avctx->hwaccel ||
1309
            s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1310
            if( avctx->idct_algo == FF_IDCT_AUTO )
1311
                avctx->idct_algo = FF_IDCT_SIMPLE;
1312

    
1313
        /* Quantization matrices may need reordering
1314
         * if DCT permutation is changed. */
1315
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1316

    
1317
        if (MPV_common_init(s) < 0)
1318
            return -2;
1319

    
1320
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1321
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1322
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1323
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1324

    
1325
        s1->mpeg_enc_ctx_allocated = 1;
1326
    }
1327
    return 0;
1328
}
1329

    
1330
static int mpeg1_decode_picture(AVCodecContext *avctx,
1331
                                const uint8_t *buf, int buf_size)
1332
{
1333
    Mpeg1Context *s1 = avctx->priv_data;
1334
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1335
    int ref, f_code, vbv_delay;
1336

    
1337
    if(mpeg_decode_postinit(s->avctx) < 0)
1338
       return -2;
1339

    
1340
    init_get_bits(&s->gb, buf, buf_size*8);
1341

    
1342
    ref = get_bits(&s->gb, 10); /* temporal ref */
1343
    s->pict_type = get_bits(&s->gb, 3);
1344
    if(s->pict_type == 0 || s->pict_type > 3)
1345
        return -1;
1346

    
1347
    vbv_delay= get_bits(&s->gb, 16);
1348
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1349
        s->full_pel[0] = get_bits1(&s->gb);
1350
        f_code = get_bits(&s->gb, 3);
1351
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1352
            return -1;
1353
        s->mpeg_f_code[0][0] = f_code;
1354
        s->mpeg_f_code[0][1] = f_code;
1355
    }
1356
    if (s->pict_type == FF_B_TYPE) {
1357
        s->full_pel[1] = get_bits1(&s->gb);
1358
        f_code = get_bits(&s->gb, 3);
1359
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1360
            return -1;
1361
        s->mpeg_f_code[1][0] = f_code;
1362
        s->mpeg_f_code[1][1] = f_code;
1363
    }
1364
    s->current_picture.pict_type= s->pict_type;
1365
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1366

    
1367
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1368
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1369

    
1370
    s->y_dc_scale = 8;
1371
    s->c_dc_scale = 8;
1372
    s->first_slice = 1;
1373
    return 0;
1374
}
1375

    
1376
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1377
{
1378
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1379
    int horiz_size_ext, vert_size_ext;
1380
    int bit_rate_ext;
1381

    
1382
    skip_bits(&s->gb, 1); /* profile and level esc*/
1383
    s->avctx->profile= get_bits(&s->gb, 3);
1384
    s->avctx->level= get_bits(&s->gb, 4);
1385
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1386
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1387
    horiz_size_ext = get_bits(&s->gb, 2);
1388
    vert_size_ext = get_bits(&s->gb, 2);
1389
    s->width |= (horiz_size_ext << 12);
1390
    s->height |= (vert_size_ext << 12);
1391
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1392
    s->bit_rate += (bit_rate_ext << 18) * 400;
1393
    skip_bits1(&s->gb); /* marker */
1394
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1395

    
1396
    s->low_delay = get_bits1(&s->gb);
1397
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1398

    
1399
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1400
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1401

    
1402
    dprintf(s->avctx, "sequence extension\n");
1403
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1404
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1405

    
1406
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1407
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1408
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1409

    
1410
}
1411

    
1412
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1413
{
1414
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1415
    int color_description, w, h;
1416

    
1417
    skip_bits(&s->gb, 3); /* video format */
1418
    color_description= get_bits1(&s->gb);
1419
    if(color_description){
1420
        skip_bits(&s->gb, 8); /* color primaries */
1421
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1422
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1423
    }
1424
    w= get_bits(&s->gb, 14);
1425
    skip_bits(&s->gb, 1); //marker
1426
    h= get_bits(&s->gb, 14);
1427
    skip_bits(&s->gb, 1); //marker
1428

    
1429
    s1->pan_scan.width= 16*w;
1430
    s1->pan_scan.height=16*h;
1431

    
1432
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1433
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1434
}
1435

    
1436
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1437
{
1438
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1439
    int i,nofco;
1440

    
1441
    nofco = 1;
1442
    if(s->progressive_sequence){
1443
        if(s->repeat_first_field){
1444
            nofco++;
1445
            if(s->top_field_first)
1446
                nofco++;
1447
        }
1448
    }else{
1449
        if(s->picture_structure == PICT_FRAME){
1450
            nofco++;
1451
            if(s->repeat_first_field)
1452
                nofco++;
1453
        }
1454
    }
1455
    for(i=0; i<nofco; i++){
1456
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1457
        skip_bits(&s->gb, 1); //marker
1458
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1459
        skip_bits(&s->gb, 1); //marker
1460
    }
1461

    
1462
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1463
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1464
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1465
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1466
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1467
        );
1468
}
1469

    
1470
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1471
{
1472
    int i, v, j;
1473

    
1474
    dprintf(s->avctx, "matrix extension\n");
1475

    
1476
    if (get_bits1(&s->gb)) {
1477
        for(i=0;i<64;i++) {
1478
            v = get_bits(&s->gb, 8);
1479
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1480
            s->intra_matrix[j] = v;
1481
            s->chroma_intra_matrix[j] = v;
1482
        }
1483
    }
1484
    if (get_bits1(&s->gb)) {
1485
        for(i=0;i<64;i++) {
1486
            v = get_bits(&s->gb, 8);
1487
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1488
            s->inter_matrix[j] = v;
1489
            s->chroma_inter_matrix[j] = v;
1490
        }
1491
    }
1492
    if (get_bits1(&s->gb)) {
1493
        for(i=0;i<64;i++) {
1494
            v = get_bits(&s->gb, 8);
1495
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1496
            s->chroma_intra_matrix[j] = v;
1497
        }
1498
    }
1499
    if (get_bits1(&s->gb)) {
1500
        for(i=0;i<64;i++) {
1501
            v = get_bits(&s->gb, 8);
1502
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1503
            s->chroma_inter_matrix[j] = v;
1504
        }
1505
    }
1506
}
1507

    
1508
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1509
{
1510
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1511

    
1512
    s->full_pel[0] = s->full_pel[1] = 0;
1513
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1514
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1515
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1516
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1517
    if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1518
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1519
        if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1520
            if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1521
                s->pict_type= FF_I_TYPE;
1522
            else
1523
                s->pict_type= FF_P_TYPE;
1524
        }else
1525
            s->pict_type= FF_B_TYPE;
1526
        s->current_picture.pict_type= s->pict_type;
1527
        s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1528
        s->first_slice= 1;
1529
    }
1530
    s->intra_dc_precision = get_bits(&s->gb, 2);
1531
    s->picture_structure = get_bits(&s->gb, 2);
1532
    s->top_field_first = get_bits1(&s->gb);
1533
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1534
    s->concealment_motion_vectors = get_bits1(&s->gb);
1535
    s->q_scale_type = get_bits1(&s->gb);
1536
    s->intra_vlc_format = get_bits1(&s->gb);
1537
    s->alternate_scan = get_bits1(&s->gb);
1538
    s->repeat_first_field = get_bits1(&s->gb);
1539
    s->chroma_420_type = get_bits1(&s->gb);
1540
    s->progressive_frame = get_bits1(&s->gb);
1541

    
1542
    if(s->picture_structure == PICT_FRAME){
1543
        s->first_field=0;
1544
        s->v_edge_pos= 16*s->mb_height;
1545
    }else{
1546
        s->first_field ^= 1;
1547
        s->v_edge_pos=  8*s->mb_height;
1548
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1549
    }
1550

    
1551
    if(s->alternate_scan){
1552
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1553
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1554
    }else{
1555
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1556
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1557
    }
1558

    
1559
    /* composite display not parsed */
1560
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1561
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1562
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1563
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1564
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1565
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1566
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1567
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1568
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1569
}
1570

    
1571
static void mpeg_decode_extension(AVCodecContext *avctx,
1572
                                  const uint8_t *buf, int buf_size)
1573
{
1574
    Mpeg1Context *s1 = avctx->priv_data;
1575
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1576
    int ext_type;
1577

    
1578
    init_get_bits(&s->gb, buf, buf_size*8);
1579

    
1580
    ext_type = get_bits(&s->gb, 4);
1581
    switch(ext_type) {
1582
    case 0x1:
1583
        mpeg_decode_sequence_extension(s1);
1584
        break;
1585
    case 0x2:
1586
        mpeg_decode_sequence_display_extension(s1);
1587
        break;
1588
    case 0x3:
1589
        mpeg_decode_quant_matrix_extension(s);
1590
        break;
1591
    case 0x7:
1592
        mpeg_decode_picture_display_extension(s1);
1593
        break;
1594
    case 0x8:
1595
        mpeg_decode_picture_coding_extension(s1);
1596
        break;
1597
    }
1598
}
1599

    
1600
static void exchange_uv(MpegEncContext *s){
1601
    DCTELEM (*tmp)[64];
1602

    
1603
    tmp           = s->pblocks[4];
1604
    s->pblocks[4] = s->pblocks[5];
1605
    s->pblocks[5] = tmp;
1606
}
1607

    
1608
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1609
    AVCodecContext *avctx= s->avctx;
1610
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1611

    
1612
    /* start frame decoding */
1613
    if(s->first_field || s->picture_structure==PICT_FRAME){
1614
        if(MPV_frame_start(s, avctx) < 0)
1615
            return -1;
1616

    
1617
        ff_er_frame_start(s);
1618

    
1619
        /* first check if we must repeat the frame */
1620
        s->current_picture_ptr->repeat_pict = 0;
1621
        if (s->repeat_first_field) {
1622
            if (s->progressive_sequence) {
1623
                if (s->top_field_first)
1624
                    s->current_picture_ptr->repeat_pict = 4;
1625
                else
1626
                    s->current_picture_ptr->repeat_pict = 2;
1627
            } else if (s->progressive_frame) {
1628
                s->current_picture_ptr->repeat_pict = 1;
1629
            }
1630
        }
1631

    
1632
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1633
    }else{ //second field
1634
            int i;
1635

    
1636
            if(!s->current_picture_ptr){
1637
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1638
                return -1;
1639
            }
1640

    
1641
            for(i=0; i<4; i++){
1642
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1643
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1644
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1645
                }
1646
            }
1647
    }
1648

    
1649
    if (avctx->hwaccel) {
1650
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1651
            return -1;
1652
    }
1653

    
1654
// MPV_frame_start will call this function too,
1655
// but we need to call it on every field
1656
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1657
        if(ff_xvmc_field_start(s,avctx) < 0)
1658
            return -1;
1659

    
1660
    return 0;
1661
}
1662

    
1663
#define DECODE_SLICE_ERROR -1
1664
#define DECODE_SLICE_OK 0
1665

    
1666
/**
1667
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1668
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1669
 *         DECODE_SLICE_OK if this slice is ok<br>
1670
 */
1671
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1672
                             const uint8_t **buf, int buf_size)
1673
{
1674
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1675
    AVCodecContext *avctx= s->avctx;
1676
    const int field_pic= s->picture_structure != PICT_FRAME;
1677
    const int lowres= s->avctx->lowres;
1678

    
1679
    s->resync_mb_x=
1680
    s->resync_mb_y= -1;
1681

    
1682
    if (mb_y<<field_pic >= s->mb_height){
1683
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1684
        return -1;
1685
    }
1686

    
1687
    init_get_bits(&s->gb, *buf, buf_size*8);
1688

    
1689
    ff_mpeg1_clean_buffers(s);
1690
    s->interlaced_dct = 0;
1691

    
1692
    s->qscale = get_qscale(s);
1693

    
1694
    if(s->qscale == 0){
1695
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1696
        return -1;
1697
    }
1698

    
1699
    /* extra slice info */
1700
    while (get_bits1(&s->gb) != 0) {
1701
        skip_bits(&s->gb, 8);
1702
    }
1703

    
1704
    s->mb_x=0;
1705

    
1706
    for(;;) {
1707
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1708
        if (code < 0){
1709
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1710
            return -1;
1711
        }
1712
        if (code >= 33) {
1713
            if (code == 33) {
1714
                s->mb_x += 33;
1715
            }
1716
            /* otherwise, stuffing, nothing to do */
1717
        } else {
1718
            s->mb_x += code;
1719
            break;
1720
        }
1721
    }
1722
    if(s->mb_x >= (unsigned)s->mb_width){
1723
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1724
        return -1;
1725
    }
1726

    
1727
    s->resync_mb_x= s->mb_x;
1728
    s->resync_mb_y= s->mb_y= mb_y;
1729
    s->mb_skip_run= 0;
1730
    ff_init_block_index(s);
1731

    
1732
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1733
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1734
             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",
1735
                 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],
1736
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1737
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1738
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1739
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1740
        }
1741
    }
1742

    
1743
    for(;;) {
1744
        //If 1, we memcpy blocks in xvmcvideo.
1745
        if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1746
            ff_xvmc_init_block(s);//set s->block
1747

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

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

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

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

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

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

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

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

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

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

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

    
1810
            ff_init_block_index(s);
1811
        }
1812

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

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

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

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

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

    
1888
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1889
        emms_c();
1890
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1891
//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1892
        if(ret < 0){
1893
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1894
                ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1895
        }else{
1896
            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1897
        }
1898

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

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

    
1909
    return 0; //not reached
1910
}
1911

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

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

    
1924
    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1925
        ff_xvmc_field_end(s);
1926

    
1927
    /* end of slice reached */
1928
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1929
        /* end of image */
1930

    
1931
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1932

    
1933
        ff_er_frame_end(s);
1934

    
1935
        MPV_frame_end(s);
1936

    
1937
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1938
            *pict= *(AVFrame*)s->current_picture_ptr;
1939
            ff_print_debug_info(s, pict);
1940
        } else {
1941
            s->picture_number++;
1942
            /* latency of 1 frame for I- and P-frames */
1943
            /* XXX: use another variable than picture_number */
1944
            if (s->last_picture_ptr != NULL) {
1945
                *pict= *(AVFrame*)s->last_picture_ptr;
1946
                 ff_print_debug_info(s, pict);
1947
            }
1948
        }
1949

    
1950
        return 1;
1951
    } else {
1952
        return 0;
1953
    }
1954
}
1955

    
1956
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1957
                                 const uint8_t *buf, int buf_size)
1958
{
1959
    Mpeg1Context *s1 = avctx->priv_data;
1960
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1961
    int width,height;
1962
    int i, v, j;
1963

    
1964
    init_get_bits(&s->gb, buf, buf_size*8);
1965

    
1966
    width = get_bits(&s->gb, 12);
1967
    height = get_bits(&s->gb, 12);
1968
    if (width <= 0 || height <= 0)
1969
        return -1;
1970
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1971
    if (s->aspect_ratio_info == 0) {
1972
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1973
        if (avctx->error_recognition >= FF_ER_COMPLIANT)
1974
            return -1;
1975
    }
1976
    s->frame_rate_index = get_bits(&s->gb, 4);
1977
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1978
        return -1;
1979
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1980
    if (get_bits1(&s->gb) == 0) /* marker */
1981
        return -1;
1982
    s->width = width;
1983
    s->height = height;
1984

    
1985
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1986
    skip_bits(&s->gb, 1);
1987

    
1988
    /* get matrix */
1989
    if (get_bits1(&s->gb)) {
1990
        for(i=0;i<64;i++) {
1991
            v = get_bits(&s->gb, 8);
1992
            if(v==0){
1993
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1994
                return -1;
1995
            }
1996
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1997
            s->intra_matrix[j] = v;
1998
            s->chroma_intra_matrix[j] = v;
1999
        }
2000
#ifdef DEBUG
2001
        dprintf(s->avctx, "intra matrix present\n");
2002
        for(i=0;i<64;i++)
2003
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2004
        dprintf(s->avctx, "\n");
2005
#endif
2006
    } else {
2007
        for(i=0;i<64;i++) {
2008
            j = s->dsp.idct_permutation[i];
2009
            v = ff_mpeg1_default_intra_matrix[i];
2010
            s->intra_matrix[j] = v;
2011
            s->chroma_intra_matrix[j] = v;
2012
        }
2013
    }
2014
    if (get_bits1(&s->gb)) {
2015
        for(i=0;i<64;i++) {
2016
            v = get_bits(&s->gb, 8);
2017
            if(v==0){
2018
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2019
                return -1;
2020
            }
2021
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2022
            s->inter_matrix[j] = v;
2023
            s->chroma_inter_matrix[j] = v;
2024
        }
2025
#ifdef DEBUG
2026
        dprintf(s->avctx, "non-intra matrix present\n");
2027
        for(i=0;i<64;i++)
2028
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2029
        dprintf(s->avctx, "\n");
2030
#endif
2031
    } else {
2032
        for(i=0;i<64;i++) {
2033
            int j= s->dsp.idct_permutation[i];
2034
            v = ff_mpeg1_default_non_intra_matrix[i];
2035
            s->inter_matrix[j] = v;
2036
            s->chroma_inter_matrix[j] = v;
2037
        }
2038
    }
2039

    
2040
    if(show_bits(&s->gb, 23) != 0){
2041
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2042
        return -1;
2043
    }
2044

    
2045
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2046
    s->progressive_sequence = 1;
2047
    s->progressive_frame = 1;
2048
    s->picture_structure = PICT_FRAME;
2049
    s->frame_pred_frame_dct = 1;
2050
    s->chroma_format = 1;
2051
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2052
    avctx->sub_id = 1; /* indicates MPEG-1 */
2053
    s->out_format = FMT_MPEG1;
2054
    s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2055
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2056

    
2057
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2058
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2059
               s->avctx->rc_buffer_size, s->bit_rate);
2060

    
2061
    return 0;
2062
}
2063

    
2064
static int vcr2_init_sequence(AVCodecContext *avctx)
2065
{
2066
    Mpeg1Context *s1 = avctx->priv_data;
2067
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2068
    int i, v;
2069

    
2070
    /* start new MPEG-1 context decoding */
2071
    s->out_format = FMT_MPEG1;
2072
    if (s1->mpeg_enc_ctx_allocated) {
2073
        MPV_common_end(s);
2074
    }
2075
    s->width  = avctx->coded_width;
2076
    s->height = avctx->coded_height;
2077
    avctx->has_b_frames= 0; //true?
2078
    s->low_delay= 1;
2079

    
2080
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2081
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2082

    
2083
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2084
        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2085
        if( avctx->idct_algo == FF_IDCT_AUTO )
2086
            avctx->idct_algo = FF_IDCT_SIMPLE;
2087

    
2088
    if (MPV_common_init(s) < 0)
2089
        return -1;
2090
    exchange_uv(s);//common init reset pblocks, so we swap them here
2091
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2092
    s1->mpeg_enc_ctx_allocated = 1;
2093

    
2094
    for(i=0;i<64;i++) {
2095
        int j= s->dsp.idct_permutation[i];
2096
        v = ff_mpeg1_default_intra_matrix[i];
2097
        s->intra_matrix[j] = v;
2098
        s->chroma_intra_matrix[j] = v;
2099

    
2100
        v = ff_mpeg1_default_non_intra_matrix[i];
2101
        s->inter_matrix[j] = v;
2102
        s->chroma_inter_matrix[j] = v;
2103
    }
2104

    
2105
    s->progressive_sequence = 1;
2106
    s->progressive_frame = 1;
2107
    s->picture_structure = PICT_FRAME;
2108
    s->frame_pred_frame_dct = 1;
2109
    s->chroma_format = 1;
2110
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2111
    avctx->sub_id = 2; /* indicates MPEG-2 */
2112
    return 0;
2113
}
2114

    
2115

    
2116
static void mpeg_decode_user_data(AVCodecContext *avctx,
2117
                                  const uint8_t *buf, int buf_size)
2118
{
2119
    const uint8_t *p;
2120
    int len, flags;
2121
    p = buf;
2122
    len = buf_size;
2123

    
2124
    /* we parse the DTG active format information */
2125
    if (len >= 5 &&
2126
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2127
        flags = p[4];
2128
        p += 5;
2129
        len -= 5;
2130
        if (flags & 0x80) {
2131
            /* skip event id */
2132
            if (len < 2)
2133
                return;
2134
            p += 2;
2135
            len -= 2;
2136
        }
2137
        if (flags & 0x40) {
2138
            if (len < 1)
2139
                return;
2140
            avctx->dtg_active_format = p[0] & 0x0f;
2141
        }
2142
    }
2143
}
2144

    
2145
static void mpeg_decode_gop(AVCodecContext *avctx,
2146
                            const uint8_t *buf, int buf_size){
2147
    Mpeg1Context *s1 = avctx->priv_data;
2148
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2149

    
2150
    int drop_frame_flag;
2151
    int time_code_hours, time_code_minutes;
2152
    int time_code_seconds, time_code_pictures;
2153
    int closed_gop, broken_link;
2154

    
2155
    init_get_bits(&s->gb, buf, buf_size*8);
2156

    
2157
    drop_frame_flag = get_bits1(&s->gb);
2158

    
2159
    time_code_hours=get_bits(&s->gb,5);
2160
    time_code_minutes = get_bits(&s->gb,6);
2161
    skip_bits1(&s->gb);//marker bit
2162
    time_code_seconds = get_bits(&s->gb,6);
2163
    time_code_pictures = get_bits(&s->gb,6);
2164

    
2165
    closed_gop  = get_bits1(&s->gb);
2166
    /*broken_link indicate that after editing the
2167
      reference frames of the first B-Frames after GOP I-Frame
2168
      are missing (open gop)*/
2169
    broken_link = get_bits1(&s->gb);
2170

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

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

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

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

    
2234
static int decode_chunks(AVCodecContext *avctx,
2235
                             AVFrame *picture, int *data_size,
2236
                             const uint8_t *buf, int buf_size);
2237

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

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

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

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

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

    
2266
#if 0
2267
    if (s->repeat_field % 2 == 1) {
2268
        s->repeat_field++;
2269
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2270
        //        s2->picture_number, s->repeat_field);
2271
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2272
            *data_size = sizeof(AVPicture);
2273
            goto the_end;
2274
        }
2275
    }
2276
#endif
2277

    
2278
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2279
        vcr2_init_sequence(avctx);
2280

    
2281
    s->slice_count= 0;
2282

    
2283
    if(avctx->extradata && !avctx->frame_number)
2284
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2285

    
2286
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2287
}
2288

    
2289
static int decode_chunks(AVCodecContext *avctx,
2290
                             AVFrame *picture, int *data_size,
2291
                             const uint8_t *buf, int buf_size)
2292
{
2293
    Mpeg1Context *s = avctx->priv_data;
2294
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2295
    const uint8_t *buf_ptr = buf;
2296
    const uint8_t *buf_end = buf + buf_size;
2297
    int ret, input_size;
2298

    
2299
    for(;;) {
2300
        /* find next start code */
2301
        uint32_t start_code = -1;
2302
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2303
        if (start_code > 0x1ff){
2304
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2305
                if(avctx->thread_count > 1){
2306
                    int i;
2307

    
2308
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2309
                    for(i=0; i<s->slice_count; i++)
2310
                        s2->error_count += s2->thread_context[i]->error_count;
2311
                }
2312

    
2313
                if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2314
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2315

    
2316
                if (slice_end(avctx, picture)) {
2317
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2318
                        *data_size = sizeof(AVPicture);
2319
                }
2320
            }
2321
            s2->pict_type= 0;
2322
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2323
        }
2324

    
2325
        input_size = buf_end - buf_ptr;
2326

    
2327
        if(avctx->debug & FF_DEBUG_STARTCODE){
2328
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2329
        }
2330

    
2331
        /* prepare data for next start code */
2332
        switch(start_code) {
2333
        case SEQ_START_CODE:
2334
            mpeg1_decode_sequence(avctx, buf_ptr,
2335
                                    input_size);
2336
            break;
2337

    
2338
        case PICTURE_START_CODE:
2339
            /* we have a complete image: we try to decompress it */
2340
            if(mpeg1_decode_picture(avctx,
2341
                                    buf_ptr, input_size) < 0)
2342
                s2->pict_type=0;
2343
            break;
2344
        case EXT_START_CODE:
2345
            mpeg_decode_extension(avctx,
2346
                                    buf_ptr, input_size);
2347
            break;
2348
        case USER_START_CODE:
2349
            mpeg_decode_user_data(avctx,
2350
                                    buf_ptr, input_size);
2351
            break;
2352
        case GOP_START_CODE:
2353
            s2->first_field=0;
2354
            mpeg_decode_gop(avctx,
2355
                                    buf_ptr, input_size);
2356
            break;
2357
        default:
2358
            if (start_code >= SLICE_MIN_START_CODE &&
2359
                start_code <= SLICE_MAX_START_CODE) {
2360
                int mb_y= start_code - SLICE_MIN_START_CODE;
2361

    
2362
                if(s2->last_picture_ptr==NULL){
2363
                /* Skip B-frames if we do not have reference frames. */
2364
                    if(s2->pict_type==FF_B_TYPE) break;
2365
                }
2366
                if(s2->next_picture_ptr==NULL){
2367
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2368
                    if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2369
                }
2370
                /* Skip B-frames if we are in a hurry. */
2371
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2372
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2373
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2374
                    || avctx->skip_frame >= AVDISCARD_ALL)
2375
                    break;
2376
                /* Skip everything if we are in a hurry>=5. */
2377
                if(avctx->hurry_up>=5) break;
2378

    
2379
                if (!s->mpeg_enc_ctx_allocated) break;
2380

    
2381
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2382
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2383
                        break;
2384
                }
2385

    
2386
                if(!s2->pict_type){
2387
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2388
                    break;
2389
                }
2390

    
2391
                if(s2->first_slice){
2392
                    s2->first_slice=0;
2393
                    if(mpeg_field_start(s2, buf, buf_size) < 0)
2394
                        return -1;
2395
                }
2396
                if(!s2->current_picture_ptr){
2397
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2398
                    return -1;
2399
                }
2400

    
2401
                if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2402
                    s->slice_count++;
2403
                    break;
2404
                }
2405

    
2406
                if(avctx->thread_count > 1){
2407
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2408
                    if(threshold <= mb_y){
2409
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2410

    
2411
                        thread_context->start_mb_y= mb_y;
2412
                        thread_context->end_mb_y  = s2->mb_height;
2413
                        if(s->slice_count){
2414
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2415
                            ff_update_duplicate_context(thread_context, s2);
2416
                        }
2417
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2418
                        s->slice_count++;
2419
                    }
2420
                    buf_ptr += 2; //FIXME add minimum number of bytes per slice
2421
                }else{
2422
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2423
                    emms_c();
2424

    
2425
                    if(ret < 0){
2426
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2427
                            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);
2428
                    }else{
2429
                        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);
2430
                    }
2431
                }
2432
            }
2433
            break;
2434
        }
2435
    }
2436
}
2437

    
2438
static int mpeg_decode_end(AVCodecContext *avctx)
2439
{
2440
    Mpeg1Context *s = avctx->priv_data;
2441

    
2442
    if (s->mpeg_enc_ctx_allocated)
2443
        MPV_common_end(&s->mpeg_enc_ctx);
2444
    return 0;
2445
}
2446

    
2447
AVCodec mpeg1video_decoder = {
2448
    "mpeg1video",
2449
    CODEC_TYPE_VIDEO,
2450
    CODEC_ID_MPEG1VIDEO,
2451
    sizeof(Mpeg1Context),
2452
    mpeg_decode_init,
2453
    NULL,
2454
    mpeg_decode_end,
2455
    mpeg_decode_frame,
2456
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2457
    .flush= ff_mpeg_flush,
2458
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2459
};
2460

    
2461
AVCodec mpeg2video_decoder = {
2462
    "mpeg2video",
2463
    CODEC_TYPE_VIDEO,
2464
    CODEC_ID_MPEG2VIDEO,
2465
    sizeof(Mpeg1Context),
2466
    mpeg_decode_init,
2467
    NULL,
2468
    mpeg_decode_end,
2469
    mpeg_decode_frame,
2470
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2471
    .flush= ff_mpeg_flush,
2472
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2473
};
2474

    
2475
//legacy decoder
2476
AVCodec mpegvideo_decoder = {
2477
    "mpegvideo",
2478
    CODEC_TYPE_VIDEO,
2479
    CODEC_ID_MPEG2VIDEO,
2480
    sizeof(Mpeg1Context),
2481
    mpeg_decode_init,
2482
    NULL,
2483
    mpeg_decode_end,
2484
    mpeg_decode_frame,
2485
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2486
    .flush= ff_mpeg_flush,
2487
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2488
};
2489

    
2490
#if CONFIG_MPEG_XVMC_DECODER
2491
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2492
    Mpeg1Context *s;
2493

    
2494
    if( avctx->thread_count > 1)
2495
        return -1;
2496
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2497
        return -1;
2498
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2499
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2500
    }
2501
    mpeg_decode_init(avctx);
2502
    s = avctx->priv_data;
2503

    
2504
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2505
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2506

    
2507
    return 0;
2508
}
2509

    
2510
AVCodec mpeg_xvmc_decoder = {
2511
    "mpegvideo_xvmc",
2512
    CODEC_TYPE_VIDEO,
2513
    CODEC_ID_MPEG2VIDEO_XVMC,
2514
    sizeof(Mpeg1Context),
2515
    mpeg_mc_decode_init,
2516
    NULL,
2517
    mpeg_decode_end,
2518
    mpeg_decode_frame,
2519
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2520
    .flush= ff_mpeg_flush,
2521
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),
2522
};
2523

    
2524
#endif
2525

    
2526
#if CONFIG_MPEG_VDPAU_DECODER
2527
AVCodec mpeg_vdpau_decoder = {
2528
    "mpegvideo_vdpau",
2529
    CODEC_TYPE_VIDEO,
2530
    CODEC_ID_MPEG2VIDEO,
2531
    sizeof(Mpeg1Context),
2532
    mpeg_decode_init,
2533
    NULL,
2534
    mpeg_decode_end,
2535
    mpeg_decode_frame,
2536
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2537
    .flush= ff_mpeg_flush,
2538
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2539
};
2540
#endif
2541

    
2542
#if CONFIG_MPEG1_VDPAU_DECODER
2543
AVCodec mpeg1_vdpau_decoder = {
2544
    "mpeg1video_vdpau",
2545
    CODEC_TYPE_VIDEO,
2546
    CODEC_ID_MPEG1VIDEO,
2547
    sizeof(Mpeg1Context),
2548
    mpeg_decode_init,
2549
    NULL,
2550
    mpeg_decode_end,
2551
    mpeg_decode_frame,
2552
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2553
    .flush= ff_mpeg_flush,
2554
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2555
};
2556
#endif
2557