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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>
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 *
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
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 */
22

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

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

    
33
#include "mpeg12.h"
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#include "mpeg12data.h"
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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"
39

    
40
//#undef NDEBUG
41
//#include <assert.h>
42

    
43

    
44
#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
49

    
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
53
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
54
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
56
                                        int n);
57
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
59
                                    int n);
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static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
61
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
62
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
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static void exchange_uv(MpegEncContext *s);
64

    
65
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};
69

    
70
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
71

    
72

    
73
#define INIT_2D_VLC_RL(rl, static_size)\
74
{\
75
    static RL_VLC_ELEM rl_vlc_table[static_size];\
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    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
77
             &rl.table_vlc[0][1], 4, 2,\
78
             &rl.table_vlc[0][0], 4, 2, static_size);\
79
\
80
    rl.rl_vlc[0]= rl_vlc_table;\
81
    init_2d_vlc_rl(&rl);\
82
}
83

    
84
static void init_2d_vlc_rl(RLTable *rl)
85
{
86
    int i;
87

    
88
    for(i=0; i<rl->vlc.table_size; i++){
89
        int code= rl->vlc.table[i][0];
90
        int len = rl->vlc.table[i][1];
91
        int level, run;
92

    
93
        if(len==0){ // illegal code
94
            run= 65;
95
            level= MAX_LEVEL;
96
        }else if(len<0){ //more bits needed
97
            run= 0;
98
            level= code;
99
        }else{
100
            if(code==rl->n){ //esc
101
                run= 65;
102
                level= 0;
103
            }else if(code==rl->n+1){ //eob
104
                run= 0;
105
                level= 127;
106
            }else{
107
                run=   rl->table_run  [code] + 1;
108
                level= rl->table_level[code];
109
            }
110
        }
111
        rl->rl_vlc[0][i].len= len;
112
        rl->rl_vlc[0][i].level= level;
113
        rl->rl_vlc[0][i].run= run;
114
    }
115
}
116

    
117
void ff_mpeg12_common_init(MpegEncContext *s)
118
{
119

    
120
    s->y_dc_scale_table=
121
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
122

    
123
}
124

    
125
void ff_mpeg1_clean_buffers(MpegEncContext *s){
126
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
127
    s->last_dc[1] = s->last_dc[0];
128
    s->last_dc[2] = s->last_dc[0];
129
    memset(s->last_mv, 0, sizeof(s->last_mv));
130
}
131

    
132

    
133
/******************************************/
134
/* decoding */
135

    
136
static VLC mv_vlc;
137
static VLC mbincr_vlc;
138
static VLC mb_ptype_vlc;
139
static VLC mb_btype_vlc;
140
static VLC mb_pat_vlc;
141

    
142
av_cold void ff_mpeg12_init_vlcs(void)
143
{
144
    static int done = 0;
145

    
146
    if (!done) {
147
        done = 1;
148

    
149
        INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
150
                 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
151
                 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
152
        INIT_VLC_STATIC(&dc_chroma_vlc,  DC_VLC_BITS, 12,
153
                 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
154
                 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
155
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
156
                 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
157
                 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
158
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
159
                 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
160
                 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
161
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
162
                 &ff_mpeg12_mbPatTable[0][1], 2, 1,
163
                 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
164

    
165
        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
166
                 &table_mb_ptype[0][1], 2, 1,
167
                 &table_mb_ptype[0][0], 2, 1, 64);
168
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
169
                 &table_mb_btype[0][1], 2, 1,
170
                 &table_mb_btype[0][0], 2, 1, 64);
171
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
172
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
173

    
174
        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
175
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
176
    }
177
}
178

    
179
static inline int get_dmv(MpegEncContext *s)
180
{
181
    if(get_bits1(&s->gb))
182
        return 1 - (get_bits1(&s->gb) << 1);
183
    else
184
        return 0;
185
}
186

    
187
static inline int get_qscale(MpegEncContext *s)
188
{
189
    int qscale = get_bits(&s->gb, 5);
190
    if (s->q_scale_type) {
191
        return non_linear_qscale[qscale];
192
    } else {
193
        return qscale << 1;
194
    }
195
}
196

    
197
/* motion type (for MPEG-2) */
198
#define MT_FIELD 1
199
#define MT_FRAME 2
200
#define MT_16X8  2
201
#define MT_DMV   3
202

    
203
static int mpeg_decode_mb(MpegEncContext *s,
204
                          DCTELEM block[12][64])
205
{
206
    int i, j, k, cbp, val, mb_type, motion_type;
207
    const int mb_block_count = 4 + (1<< s->chroma_format);
208

    
209
    dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
210

    
211
    assert(s->mb_skipped==0);
212

    
213
    if (s->mb_skip_run-- != 0) {
214
        if (s->pict_type == FF_P_TYPE) {
215
            s->mb_skipped = 1;
216
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
217
        } else {
218
            int mb_type;
219

    
220
            if(s->mb_x)
221
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
222
            else
223
                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
224
            if(IS_INTRA(mb_type))
225
                return -1;
226

    
227
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
228
                mb_type | MB_TYPE_SKIP;
229
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
230

    
231
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
232
                s->mb_skipped = 1;
233
        }
234

    
235
        return 0;
236
    }
237

    
238
    switch(s->pict_type) {
239
    default:
240
    case FF_I_TYPE:
241
        if (get_bits1(&s->gb) == 0) {
242
            if (get_bits1(&s->gb) == 0){
243
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
244
                return -1;
245
            }
246
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
247
        } else {
248
            mb_type = MB_TYPE_INTRA;
249
        }
250
        break;
251
    case FF_P_TYPE:
252
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
253
        if (mb_type < 0){
254
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
255
            return -1;
256
        }
257
        mb_type = ptype2mb_type[ mb_type ];
258
        break;
259
    case FF_B_TYPE:
260
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
261
        if (mb_type < 0){
262
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
263
            return -1;
264
        }
265
        mb_type = btype2mb_type[ mb_type ];
266
        break;
267
    }
268
    dprintf(s->avctx, "mb_type=%x\n", mb_type);
269
//    motion_type = 0; /* avoid warning */
270
    if (IS_INTRA(mb_type)) {
271
        s->dsp.clear_blocks(s->block[0]);
272

    
273
        if(!s->chroma_y_shift){
274
            s->dsp.clear_blocks(s->block[6]);
275
        }
276

    
277
        /* compute DCT type */
278
        if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
279
            !s->frame_pred_frame_dct) {
280
            s->interlaced_dct = get_bits1(&s->gb);
281
        }
282

    
283
        if (IS_QUANT(mb_type))
284
            s->qscale = get_qscale(s);
285

    
286
        if (s->concealment_motion_vectors) {
287
            /* just parse them */
288
            if (s->picture_structure != PICT_FRAME)
289
                skip_bits1(&s->gb); /* field select */
290

    
291
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
292
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
293
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
294
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
295

    
296
            skip_bits1(&s->gb); /* marker */
297
        }else
298
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
299
        s->mb_intra = 1;
300
#if CONFIG_MPEG_XVMC_DECODER
301
        //if 1, we memcpy blocks in xvmcvideo
302
        if(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
#endif
309

    
310
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
311
            if(s->flags2 & CODEC_FLAG2_FAST){
312
                for(i=0;i<6;i++) {
313
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
314
                }
315
            }else{
316
                for(i=0;i<mb_block_count;i++) {
317
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
318
                        return -1;
319
                }
320
            }
321
        } else {
322
            for(i=0;i<6;i++) {
323
                if (ff_mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
324
                    return -1;
325
            }
326
        }
327
    } else {
328
        if (mb_type & MB_TYPE_ZERO_MV){
329
            assert(mb_type & MB_TYPE_CBP);
330

    
331
            s->mv_dir = MV_DIR_FORWARD;
332
            if(s->picture_structure == PICT_FRAME){
333
                if(!s->frame_pred_frame_dct)
334
                    s->interlaced_dct = get_bits1(&s->gb);
335
                s->mv_type = MV_TYPE_16X16;
336
            }else{
337
                s->mv_type = MV_TYPE_FIELD;
338
                mb_type |= MB_TYPE_INTERLACED;
339
                s->field_select[0][0]= s->picture_structure - 1;
340
            }
341

    
342
            if (IS_QUANT(mb_type))
343
                s->qscale = get_qscale(s);
344

    
345
            s->last_mv[0][0][0] = 0;
346
            s->last_mv[0][0][1] = 0;
347
            s->last_mv[0][1][0] = 0;
348
            s->last_mv[0][1][1] = 0;
349
            s->mv[0][0][0] = 0;
350
            s->mv[0][0][1] = 0;
351
        }else{
352
            assert(mb_type & MB_TYPE_L0L1);
353
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
354
            /* get additional motion vector type */
355
            if (s->frame_pred_frame_dct)
356
                motion_type = MT_FRAME;
357
            else{
358
                motion_type = get_bits(&s->gb, 2);
359
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
360
                    s->interlaced_dct = get_bits1(&s->gb);
361
            }
362

    
363
            if (IS_QUANT(mb_type))
364
                s->qscale = get_qscale(s);
365

    
366
            /* motion vectors */
367
            s->mv_dir= (mb_type>>13)&3;
368
            dprintf(s->avctx, "motion_type=%d\n", motion_type);
369
            switch(motion_type) {
370
            case MT_FRAME: /* or MT_16X8 */
371
                if (s->picture_structure == PICT_FRAME) {
372
                    mb_type |= MB_TYPE_16x16;
373
                    s->mv_type = MV_TYPE_16X16;
374
                    for(i=0;i<2;i++) {
375
                        if (USES_LIST(mb_type, i)) {
376
                            /* MT_FRAME */
377
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
378
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
379
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
380
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
381
                            /* full_pel: only for MPEG-1 */
382
                            if (s->full_pel[i]){
383
                                s->mv[i][0][0] <<= 1;
384
                                s->mv[i][0][1] <<= 1;
385
                            }
386
                        }
387
                    }
388
                } else {
389
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
390
                    s->mv_type = MV_TYPE_16X8;
391
                    for(i=0;i<2;i++) {
392
                        if (USES_LIST(mb_type, i)) {
393
                            /* MT_16X8 */
394
                            for(j=0;j<2;j++) {
395
                                s->field_select[i][j] = get_bits1(&s->gb);
396
                                for(k=0;k<2;k++) {
397
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
398
                                                             s->last_mv[i][j][k]);
399
                                    s->last_mv[i][j][k] = val;
400
                                    s->mv[i][j][k] = val;
401
                                }
402
                            }
403
                        }
404
                    }
405
                }
406
                break;
407
            case MT_FIELD:
408
                s->mv_type = MV_TYPE_FIELD;
409
                if (s->picture_structure == PICT_FRAME) {
410
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
411
                    for(i=0;i<2;i++) {
412
                        if (USES_LIST(mb_type, i)) {
413
                            for(j=0;j<2;j++) {
414
                                s->field_select[i][j] = get_bits1(&s->gb);
415
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
416
                                                         s->last_mv[i][j][0]);
417
                                s->last_mv[i][j][0] = val;
418
                                s->mv[i][j][0] = val;
419
                                dprintf(s->avctx, "fmx=%d\n", val);
420
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
421
                                                         s->last_mv[i][j][1] >> 1);
422
                                s->last_mv[i][j][1] = val << 1;
423
                                s->mv[i][j][1] = val;
424
                                dprintf(s->avctx, "fmy=%d\n", val);
425
                            }
426
                        }
427
                    }
428
                } else {
429
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
430
                    for(i=0;i<2;i++) {
431
                        if (USES_LIST(mb_type, i)) {
432
                            s->field_select[i][0] = get_bits1(&s->gb);
433
                            for(k=0;k<2;k++) {
434
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
435
                                                         s->last_mv[i][0][k]);
436
                                s->last_mv[i][0][k] = val;
437
                                s->last_mv[i][1][k] = val;
438
                                s->mv[i][0][k] = val;
439
                            }
440
                        }
441
                    }
442
                }
443
                break;
444
            case MT_DMV:
445
                s->mv_type = MV_TYPE_DMV;
446
                for(i=0;i<2;i++) {
447
                    if (USES_LIST(mb_type, i)) {
448
                        int dmx, dmy, mx, my, m;
449
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
450
                                                s->last_mv[i][0][0]);
451
                        s->last_mv[i][0][0] = mx;
452
                        s->last_mv[i][1][0] = mx;
453
                        dmx = get_dmv(s);
454
                        my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
455
                                                s->last_mv[i][0][1] >> 1);
456
                        dmy = get_dmv(s);
457

    
458

    
459
                        s->last_mv[i][0][1] = my<<1;
460
                        s->last_mv[i][1][1] = my<<1;
461

    
462
                        s->mv[i][0][0] = mx;
463
                        s->mv[i][0][1] = my;
464
                        s->mv[i][1][0] = mx;//not used
465
                        s->mv[i][1][1] = my;//not used
466

    
467
                        if (s->picture_structure == PICT_FRAME) {
468
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
469

    
470
                            //m = 1 + 2 * s->top_field_first;
471
                            m = s->top_field_first ? 1 : 3;
472

    
473
                            /* top -> top pred */
474
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
475
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
476
                            m = 4 - m;
477
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
478
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
479
                        } else {
480
                            mb_type |= MB_TYPE_16x16;
481

    
482
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
483
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
484
                            if(s->picture_structure == PICT_TOP_FIELD)
485
                                s->mv[i][2][1]--;
486
                            else
487
                                s->mv[i][2][1]++;
488
                        }
489
                    }
490
                }
491
                break;
492
            default:
493
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
494
                return -1;
495
            }
496
        }
497

    
498
        s->mb_intra = 0;
499
        if (HAS_CBP(mb_type)) {
500
            s->dsp.clear_blocks(s->block[0]);
501

    
502
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
503
            if(mb_block_count > 6){
504
                 cbp<<= mb_block_count-6;
505
                 cbp |= get_bits(&s->gb, mb_block_count-6);
506
                 s->dsp.clear_blocks(s->block[6]);
507
            }
508
            if (cbp <= 0){
509
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
510
                return -1;
511
            }
512

    
513
#if CONFIG_MPEG_XVMC_DECODER
514
            //if 1, we memcpy blocks in xvmcvideo
515
            if(s->avctx->xvmc_acceleration > 1){
516
                ff_xvmc_pack_pblocks(s,cbp);
517
                if(s->swap_uv){
518
                    exchange_uv(s);
519
                }
520
            }
521
#endif
522

    
523
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
524
                if(s->flags2 & CODEC_FLAG2_FAST){
525
                    for(i=0;i<6;i++) {
526
                        if(cbp & 32) {
527
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
528
                        } else {
529
                            s->block_last_index[i] = -1;
530
                        }
531
                        cbp+=cbp;
532
                    }
533
                }else{
534
                    cbp<<= 12-mb_block_count;
535

    
536
                    for(i=0;i<mb_block_count;i++) {
537
                        if ( cbp & (1<<11) ) {
538
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
539
                                return -1;
540
                        } else {
541
                            s->block_last_index[i] = -1;
542
                        }
543
                        cbp+=cbp;
544
                    }
545
                }
546
            } else {
547
                if(s->flags2 & CODEC_FLAG2_FAST){
548
                    for(i=0;i<6;i++) {
549
                        if (cbp & 32) {
550
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
551
                        } else {
552
                            s->block_last_index[i] = -1;
553
                        }
554
                        cbp+=cbp;
555
                    }
556
                }else{
557
                    for(i=0;i<6;i++) {
558
                        if (cbp & 32) {
559
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
560
                                return -1;
561
                        } else {
562
                            s->block_last_index[i] = -1;
563
                        }
564
                        cbp+=cbp;
565
                    }
566
                }
567
            }
568
        }else{
569
            for(i=0;i<12;i++)
570
                s->block_last_index[i] = -1;
571
        }
572
    }
573

    
574
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
575

    
576
    return 0;
577
}
578

    
579
/* as H.263, but only 17 codes */
580
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
581
{
582
    int code, sign, val, l, shift;
583

    
584
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
585
    if (code == 0) {
586
        return pred;
587
    }
588
    if (code < 0) {
589
        return 0xffff;
590
    }
591

    
592
    sign = get_bits1(&s->gb);
593
    shift = fcode - 1;
594
    val = code;
595
    if (shift) {
596
        val = (val - 1) << shift;
597
        val |= get_bits(&s->gb, shift);
598
        val++;
599
    }
600
    if (sign)
601
        val = -val;
602
    val += pred;
603

    
604
    /* modulo decoding */
605
    l= INT_BIT - 5 - shift;
606
    val = (val<<l)>>l;
607
    return val;
608
}
609

    
610
inline int ff_mpeg1_decode_block_intra(MpegEncContext *s,
611
                               DCTELEM *block,
612
                               int n)
613
{
614
    int level, dc, diff, i, j, run;
615
    int component;
616
    RLTable *rl = &ff_rl_mpeg1;
617
    uint8_t * const scantable= s->intra_scantable.permutated;
618
    const uint16_t *quant_matrix= s->intra_matrix;
619
    const int qscale= s->qscale;
620

    
621
    /* DC coefficient */
622
    component = (n <= 3 ? 0 : n - 4 + 1);
623
    diff = decode_dc(&s->gb, component);
624
    if (diff >= 0xffff)
625
        return -1;
626
    dc = s->last_dc[component];
627
    dc += diff;
628
    s->last_dc[component] = dc;
629
    block[0] = dc*quant_matrix[0];
630
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
631
    i = 0;
632
    {
633
        OPEN_READER(re, &s->gb);
634
        /* now quantify & encode AC coefficients */
635
        for(;;) {
636
            UPDATE_CACHE(re, &s->gb);
637
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
638

    
639
            if(level == 127){
640
                break;
641
            } else if(level != 0) {
642
                i += run;
643
                j = scantable[i];
644
                level= (level*qscale*quant_matrix[j])>>4;
645
                level= (level-1)|1;
646
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
647
                LAST_SKIP_BITS(re, &s->gb, 1);
648
            } else {
649
                /* escape */
650
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
651
                UPDATE_CACHE(re, &s->gb);
652
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
653
                if (level == -128) {
654
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
655
                } else if (level == 0) {
656
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
657
                }
658
                i += run;
659
                j = scantable[i];
660
                if(level<0){
661
                    level= -level;
662
                    level= (level*qscale*quant_matrix[j])>>4;
663
                    level= (level-1)|1;
664
                    level= -level;
665
                }else{
666
                    level= (level*qscale*quant_matrix[j])>>4;
667
                    level= (level-1)|1;
668
                }
669
            }
670
            if (i > 63){
671
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
672
                return -1;
673
            }
674

    
675
            block[j] = level;
676
        }
677
        CLOSE_READER(re, &s->gb);
678
    }
679
    s->block_last_index[n] = i;
680
   return 0;
681
}
682

    
683
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
684
                               DCTELEM *block,
685
                               int n)
686
{
687
    int level, i, j, run;
688
    RLTable *rl = &ff_rl_mpeg1;
689
    uint8_t * const scantable= s->intra_scantable.permutated;
690
    const uint16_t *quant_matrix= s->inter_matrix;
691
    const int qscale= s->qscale;
692

    
693
    {
694
        OPEN_READER(re, &s->gb);
695
        i = -1;
696
        // special case for first coefficient, no need to add second VLC table
697
        UPDATE_CACHE(re, &s->gb);
698
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
699
            level= (3*qscale*quant_matrix[0])>>5;
700
            level= (level-1)|1;
701
            if(GET_CACHE(re, &s->gb)&0x40000000)
702
                level= -level;
703
            block[0] = level;
704
            i++;
705
            SKIP_BITS(re, &s->gb, 2);
706
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
707
                goto end;
708
        }
709
#if MIN_CACHE_BITS < 19
710
        UPDATE_CACHE(re, &s->gb);
711
#endif
712
        /* now quantify & encode AC coefficients */
713
        for(;;) {
714
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
715

    
716
            if(level != 0) {
717
                i += run;
718
                j = scantable[i];
719
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
720
                level= (level-1)|1;
721
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
722
                SKIP_BITS(re, &s->gb, 1);
723
            } else {
724
                /* escape */
725
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
726
                UPDATE_CACHE(re, &s->gb);
727
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
728
                if (level == -128) {
729
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
730
                } else if (level == 0) {
731
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
732
                }
733
                i += run;
734
                j = scantable[i];
735
                if(level<0){
736
                    level= -level;
737
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
738
                    level= (level-1)|1;
739
                    level= -level;
740
                }else{
741
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
742
                    level= (level-1)|1;
743
                }
744
            }
745
            if (i > 63){
746
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
747
                return -1;
748
            }
749

    
750
            block[j] = level;
751
#if MIN_CACHE_BITS < 19
752
            UPDATE_CACHE(re, &s->gb);
753
#endif
754
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
755
                break;
756
#if MIN_CACHE_BITS >= 19
757
            UPDATE_CACHE(re, &s->gb);
758
#endif
759
        }
760
end:
761
        LAST_SKIP_BITS(re, &s->gb, 2);
762
        CLOSE_READER(re, &s->gb);
763
    }
764
    s->block_last_index[n] = i;
765
    return 0;
766
}
767

    
768
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
769
{
770
    int level, i, j, run;
771
    RLTable *rl = &ff_rl_mpeg1;
772
    uint8_t * const scantable= s->intra_scantable.permutated;
773
    const int qscale= s->qscale;
774

    
775
    {
776
        OPEN_READER(re, &s->gb);
777
        i = -1;
778
        // special case for first coefficient, no need to add second VLC table
779
        UPDATE_CACHE(re, &s->gb);
780
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
781
            level= (3*qscale)>>1;
782
            level= (level-1)|1;
783
            if(GET_CACHE(re, &s->gb)&0x40000000)
784
                level= -level;
785
            block[0] = level;
786
            i++;
787
            SKIP_BITS(re, &s->gb, 2);
788
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
789
                goto end;
790
        }
791
#if MIN_CACHE_BITS < 19
792
        UPDATE_CACHE(re, &s->gb);
793
#endif
794

    
795
        /* now quantify & encode AC coefficients */
796
        for(;;) {
797
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
798

    
799
            if(level != 0) {
800
                i += run;
801
                j = scantable[i];
802
                level= ((level*2+1)*qscale)>>1;
803
                level= (level-1)|1;
804
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
805
                SKIP_BITS(re, &s->gb, 1);
806
            } else {
807
                /* escape */
808
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
809
                UPDATE_CACHE(re, &s->gb);
810
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
811
                if (level == -128) {
812
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
813
                } else if (level == 0) {
814
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
815
                }
816
                i += run;
817
                j = scantable[i];
818
                if(level<0){
819
                    level= -level;
820
                    level= ((level*2+1)*qscale)>>1;
821
                    level= (level-1)|1;
822
                    level= -level;
823
                }else{
824
                    level= ((level*2+1)*qscale)>>1;
825
                    level= (level-1)|1;
826
                }
827
            }
828

    
829
            block[j] = level;
830
#if MIN_CACHE_BITS < 19
831
            UPDATE_CACHE(re, &s->gb);
832
#endif
833
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
834
                break;
835
#if MIN_CACHE_BITS >= 19
836
            UPDATE_CACHE(re, &s->gb);
837
#endif
838
        }
839
end:
840
        LAST_SKIP_BITS(re, &s->gb, 2);
841
        CLOSE_READER(re, &s->gb);
842
    }
843
    s->block_last_index[n] = i;
844
    return 0;
845
}
846

    
847

    
848
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
849
                               DCTELEM *block,
850
                               int n)
851
{
852
    int level, i, j, run;
853
    RLTable *rl = &ff_rl_mpeg1;
854
    uint8_t * const scantable= s->intra_scantable.permutated;
855
    const uint16_t *quant_matrix;
856
    const int qscale= s->qscale;
857
    int mismatch;
858

    
859
    mismatch = 1;
860

    
861
    {
862
        OPEN_READER(re, &s->gb);
863
        i = -1;
864
        if (n < 4)
865
            quant_matrix = s->inter_matrix;
866
        else
867
            quant_matrix = s->chroma_inter_matrix;
868

    
869
        // special case for first coefficient, no need to add second VLC table
870
        UPDATE_CACHE(re, &s->gb);
871
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
872
            level= (3*qscale*quant_matrix[0])>>5;
873
            if(GET_CACHE(re, &s->gb)&0x40000000)
874
                level= -level;
875
            block[0] = level;
876
            mismatch ^= level;
877
            i++;
878
            SKIP_BITS(re, &s->gb, 2);
879
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
880
                goto end;
881
        }
882
#if MIN_CACHE_BITS < 19
883
        UPDATE_CACHE(re, &s->gb);
884
#endif
885

    
886
        /* now quantify & encode AC coefficients */
887
        for(;;) {
888
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
889

    
890
            if(level != 0) {
891
                i += run;
892
                j = scantable[i];
893
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
894
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
895
                SKIP_BITS(re, &s->gb, 1);
896
            } else {
897
                /* escape */
898
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
899
                UPDATE_CACHE(re, &s->gb);
900
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
901

    
902
                i += run;
903
                j = scantable[i];
904
                if(level<0){
905
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
906
                    level= -level;
907
                }else{
908
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
909
                }
910
            }
911
            if (i > 63){
912
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
913
                return -1;
914
            }
915

    
916
            mismatch ^= level;
917
            block[j] = level;
918
#if MIN_CACHE_BITS < 19
919
            UPDATE_CACHE(re, &s->gb);
920
#endif
921
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
922
                break;
923
#if MIN_CACHE_BITS >= 19
924
            UPDATE_CACHE(re, &s->gb);
925
#endif
926
        }
927
end:
928
        LAST_SKIP_BITS(re, &s->gb, 2);
929
        CLOSE_READER(re, &s->gb);
930
    }
931
    block[63] ^= (mismatch & 1);
932

    
933
    s->block_last_index[n] = i;
934
    return 0;
935
}
936

    
937
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
938
                               DCTELEM *block,
939
                               int n)
940
{
941
    int level, i, j, run;
942
    RLTable *rl = &ff_rl_mpeg1;
943
    uint8_t * const scantable= s->intra_scantable.permutated;
944
    const int qscale= s->qscale;
945
    OPEN_READER(re, &s->gb);
946
    i = -1;
947

    
948
    // special case for first coefficient, no need to add second VLC table
949
    UPDATE_CACHE(re, &s->gb);
950
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
951
        level= (3*qscale)>>1;
952
        if(GET_CACHE(re, &s->gb)&0x40000000)
953
            level= -level;
954
        block[0] = level;
955
        i++;
956
        SKIP_BITS(re, &s->gb, 2);
957
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
958
            goto end;
959
    }
960
#if MIN_CACHE_BITS < 19
961
    UPDATE_CACHE(re, &s->gb);
962
#endif
963

    
964
    /* now quantify & encode AC coefficients */
965
    for(;;) {
966
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
967

    
968
        if(level != 0) {
969
            i += run;
970
            j = scantable[i];
971
            level= ((level*2+1)*qscale)>>1;
972
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
973
            SKIP_BITS(re, &s->gb, 1);
974
        } else {
975
            /* escape */
976
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
977
            UPDATE_CACHE(re, &s->gb);
978
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
979

    
980
            i += run;
981
            j = scantable[i];
982
            if(level<0){
983
                level= ((-level*2+1)*qscale)>>1;
984
                level= -level;
985
            }else{
986
                level= ((level*2+1)*qscale)>>1;
987
            }
988
        }
989

    
990
        block[j] = level;
991
#if MIN_CACHE_BITS < 19
992
        UPDATE_CACHE(re, &s->gb);
993
#endif
994
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
995
            break;
996
#if MIN_CACHE_BITS >=19
997
        UPDATE_CACHE(re, &s->gb);
998
#endif
999
    }
1000
end:
1001
    LAST_SKIP_BITS(re, &s->gb, 2);
1002
    CLOSE_READER(re, &s->gb);
1003
    s->block_last_index[n] = i;
1004
    return 0;
1005
}
1006

    
1007

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1169
} Mpeg1Context;
1170

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

    
1177
    /* we need some permutation to store matrices,
1178
     * until MPV_common_init() sets the real permutation. */
1179
    for(i=0;i<64;i++)
1180
       s2->dsp.idct_permutation[i]=i;
1181

    
1182
    MPV_decode_defaults(s2);
1183

    
1184
    s->mpeg_enc_ctx.avctx= avctx;
1185
    s->mpeg_enc_ctx.flags= avctx->flags;
1186
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1187
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1188
    ff_mpeg12_init_vlcs();
1189

    
1190
    s->mpeg_enc_ctx_allocated = 0;
1191
    s->mpeg_enc_ctx.picture_number = 0;
1192
    s->repeat_field = 0;
1193
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1194
    return 0;
1195
}
1196

    
1197
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1198
                                     const uint8_t *new_perm){
1199
    uint16_t temp_matrix[64];
1200
    int i;
1201

    
1202
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1203

    
1204
    for(i=0;i<64;i++){
1205
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1206
    }
1207
}
1208

    
1209
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1210
    Mpeg1Context *s1 = avctx->priv_data;
1211
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1212

    
1213
    if(avctx->xvmc_acceleration)
1214
        return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1215
    else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1216
        if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1217
            return PIX_FMT_VDPAU_MPEG1;
1218
        else
1219
            return PIX_FMT_VDPAU_MPEG2;
1220
    }else{
1221
        if(s->chroma_format <  2)
1222
            return PIX_FMT_YUV420P;
1223
        else if(s->chroma_format == 2)
1224
            return PIX_FMT_YUV422P;
1225
        else
1226
            return PIX_FMT_YUV444P;
1227
    }
1228
}
1229

    
1230
/* Call this function when we know all parameters.
1231
 * It may be called in different places for MPEG-1 and MPEG-2. */
1232
static int mpeg_decode_postinit(AVCodecContext *avctx){
1233
    Mpeg1Context *s1 = avctx->priv_data;
1234
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1235
    uint8_t old_permutation[64];
1236

    
1237
    if (
1238
        (s1->mpeg_enc_ctx_allocated == 0)||
1239
        avctx->coded_width  != s->width ||
1240
        avctx->coded_height != s->height||
1241
        s1->save_width != s->width ||
1242
        s1->save_height != s->height ||
1243
        s1->save_aspect_info != s->aspect_ratio_info||
1244
        0)
1245
    {
1246

    
1247
        if (s1->mpeg_enc_ctx_allocated) {
1248
            ParseContext pc= s->parse_context;
1249
            s->parse_context.buffer=0;
1250
            MPV_common_end(s);
1251
            s->parse_context= pc;
1252
        }
1253

    
1254
        if( (s->width == 0 )||(s->height == 0))
1255
            return -2;
1256

    
1257
        avcodec_set_dimensions(avctx, s->width, s->height);
1258
        avctx->bit_rate = s->bit_rate;
1259
        s1->save_aspect_info = s->aspect_ratio_info;
1260
        s1->save_width = s->width;
1261
        s1->save_height = s->height;
1262

    
1263
        /* low_delay may be forced, in this case we will have B-frames
1264
         * that behave like P-frames. */
1265
        avctx->has_b_frames = !(s->low_delay);
1266

    
1267
        assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1268
        if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1269
            //MPEG-1 fps
1270
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1271
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1272
            //MPEG-1 aspect
1273
            avctx->sample_aspect_ratio= av_d2q(
1274
                    1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1275

    
1276
        }else{//MPEG-2
1277
        //MPEG-2 fps
1278
            av_reduce(
1279
                &s->avctx->time_base.den,
1280
                &s->avctx->time_base.num,
1281
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1282
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1283
                1<<30);
1284
        //MPEG-2 aspect
1285
            if(s->aspect_ratio_info > 1){
1286
                //we ignore the spec here as reality does not match the spec, see for example
1287
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1288
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1289
                    s->avctx->sample_aspect_ratio=
1290
                        av_div_q(
1291
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1292
                         (AVRational){s->width, s->height}
1293
                         );
1294
                }else{
1295
                    s->avctx->sample_aspect_ratio=
1296
                        av_div_q(
1297
                         ff_mpeg2_aspect[s->aspect_ratio_info],
1298
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1299
                        );
1300
                }
1301
            }else{
1302
                s->avctx->sample_aspect_ratio=
1303
                    ff_mpeg2_aspect[s->aspect_ratio_info];
1304
            }
1305
        }//MPEG-2
1306

    
1307
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1308
        //until then pix_fmt may be changed right after codec init
1309
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1310
            s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1311
            if( avctx->idct_algo == FF_IDCT_AUTO )
1312
                avctx->idct_algo = FF_IDCT_SIMPLE;
1313

    
1314
        /* Quantization matrices may need reordering
1315
         * if DCT permutation is changed. */
1316
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1317

    
1318
        if (MPV_common_init(s) < 0)
1319
            return -2;
1320

    
1321
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1322
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1323
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1324
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1325

    
1326
        s1->mpeg_enc_ctx_allocated = 1;
1327
    }
1328
    return 0;
1329
}
1330

    
1331
static int mpeg1_decode_picture(AVCodecContext *avctx,
1332
                                const uint8_t *buf, int buf_size)
1333
{
1334
    Mpeg1Context *s1 = avctx->priv_data;
1335
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1336
    int ref, f_code, vbv_delay;
1337

    
1338
    if(mpeg_decode_postinit(s->avctx) < 0)
1339
       return -2;
1340

    
1341
    init_get_bits(&s->gb, buf, buf_size*8);
1342

    
1343
    ref = get_bits(&s->gb, 10); /* temporal ref */
1344
    s->pict_type = get_bits(&s->gb, 3);
1345
    if(s->pict_type == 0 || s->pict_type > 3)
1346
        return -1;
1347

    
1348
    vbv_delay= get_bits(&s->gb, 16);
1349
    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1350
        s->full_pel[0] = get_bits1(&s->gb);
1351
        f_code = get_bits(&s->gb, 3);
1352
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1353
            return -1;
1354
        s->mpeg_f_code[0][0] = f_code;
1355
        s->mpeg_f_code[0][1] = f_code;
1356
    }
1357
    if (s->pict_type == FF_B_TYPE) {
1358
        s->full_pel[1] = get_bits1(&s->gb);
1359
        f_code = get_bits(&s->gb, 3);
1360
        if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1361
            return -1;
1362
        s->mpeg_f_code[1][0] = f_code;
1363
        s->mpeg_f_code[1][1] = f_code;
1364
    }
1365
    s->current_picture.pict_type= s->pict_type;
1366
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1367

    
1368
    if(avctx->debug & FF_DEBUG_PICT_INFO)
1369
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1370

    
1371
    s->y_dc_scale = 8;
1372
    s->c_dc_scale = 8;
1373
    s->first_slice = 1;
1374
    return 0;
1375
}
1376

    
1377
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1378
{
1379
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1380
    int horiz_size_ext, vert_size_ext;
1381
    int bit_rate_ext;
1382

    
1383
    skip_bits(&s->gb, 1); /* profile and level esc*/
1384
    s->avctx->profile= get_bits(&s->gb, 3);
1385
    s->avctx->level= get_bits(&s->gb, 4);
1386
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1387
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1388
    horiz_size_ext = get_bits(&s->gb, 2);
1389
    vert_size_ext = get_bits(&s->gb, 2);
1390
    s->width |= (horiz_size_ext << 12);
1391
    s->height |= (vert_size_ext << 12);
1392
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1393
    s->bit_rate += (bit_rate_ext << 18) * 400;
1394
    skip_bits1(&s->gb); /* marker */
1395
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1396

    
1397
    s->low_delay = get_bits1(&s->gb);
1398
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1399

    
1400
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1401
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1402

    
1403
    dprintf(s->avctx, "sequence extension\n");
1404
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1405
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1406

    
1407
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1408
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1409
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1410

    
1411
}
1412

    
1413
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1414
{
1415
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1416
    int color_description, w, h;
1417

    
1418
    skip_bits(&s->gb, 3); /* video format */
1419
    color_description= get_bits1(&s->gb);
1420
    if(color_description){
1421
        skip_bits(&s->gb, 8); /* color primaries */
1422
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1423
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1424
    }
1425
    w= get_bits(&s->gb, 14);
1426
    skip_bits(&s->gb, 1); //marker
1427
    h= get_bits(&s->gb, 14);
1428
    skip_bits(&s->gb, 1); //marker
1429

    
1430
    s1->pan_scan.width= 16*w;
1431
    s1->pan_scan.height=16*h;
1432

    
1433
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1434
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1435
}
1436

    
1437
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1438
{
1439
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1440
    int i,nofco;
1441

    
1442
    nofco = 1;
1443
    if(s->progressive_sequence){
1444
        if(s->repeat_first_field){
1445
            nofco++;
1446
            if(s->top_field_first)
1447
                nofco++;
1448
        }
1449
    }else{
1450
        if(s->picture_structure == PICT_FRAME){
1451
            nofco++;
1452
            if(s->repeat_first_field)
1453
                nofco++;
1454
        }
1455
    }
1456
    for(i=0; i<nofco; i++){
1457
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1458
        skip_bits(&s->gb, 1); //marker
1459
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1460
        skip_bits(&s->gb, 1); //marker
1461
    }
1462

    
1463
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1464
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1465
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1466
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1467
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1468
        );
1469
}
1470

    
1471
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1472
{
1473
    int i, v, j;
1474

    
1475
    dprintf(s->avctx, "matrix extension\n");
1476

    
1477
    if (get_bits1(&s->gb)) {
1478
        for(i=0;i<64;i++) {
1479
            v = get_bits(&s->gb, 8);
1480
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1481
            s->intra_matrix[j] = v;
1482
            s->chroma_intra_matrix[j] = v;
1483
        }
1484
    }
1485
    if (get_bits1(&s->gb)) {
1486
        for(i=0;i<64;i++) {
1487
            v = get_bits(&s->gb, 8);
1488
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1489
            s->inter_matrix[j] = v;
1490
            s->chroma_inter_matrix[j] = v;
1491
        }
1492
    }
1493
    if (get_bits1(&s->gb)) {
1494
        for(i=0;i<64;i++) {
1495
            v = get_bits(&s->gb, 8);
1496
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1497
            s->chroma_intra_matrix[j] = v;
1498
        }
1499
    }
1500
    if (get_bits1(&s->gb)) {
1501
        for(i=0;i<64;i++) {
1502
            v = get_bits(&s->gb, 8);
1503
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1504
            s->chroma_inter_matrix[j] = v;
1505
        }
1506
    }
1507
}
1508

    
1509
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1510
{
1511
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1512

    
1513
    s->full_pel[0] = s->full_pel[1] = 0;
1514
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1515
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1516
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1517
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1518
    if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1519
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1520
        if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1521
            if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1522
                s->pict_type= FF_I_TYPE;
1523
            else
1524
                s->pict_type= FF_P_TYPE;
1525
        }else
1526
            s->pict_type= FF_B_TYPE;
1527
        s->current_picture.pict_type= s->pict_type;
1528
        s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1529
        s->first_slice= 1;
1530
    }
1531
    s->intra_dc_precision = get_bits(&s->gb, 2);
1532
    s->picture_structure = get_bits(&s->gb, 2);
1533
    s->top_field_first = get_bits1(&s->gb);
1534
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1535
    s->concealment_motion_vectors = get_bits1(&s->gb);
1536
    s->q_scale_type = get_bits1(&s->gb);
1537
    s->intra_vlc_format = get_bits1(&s->gb);
1538
    s->alternate_scan = get_bits1(&s->gb);
1539
    s->repeat_first_field = get_bits1(&s->gb);
1540
    s->chroma_420_type = get_bits1(&s->gb);
1541
    s->progressive_frame = get_bits1(&s->gb);
1542

    
1543
    if(s->picture_structure == PICT_FRAME){
1544
        s->first_field=0;
1545
        s->v_edge_pos= 16*s->mb_height;
1546
    }else{
1547
        s->first_field ^= 1;
1548
        s->v_edge_pos=  8*s->mb_height;
1549
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1550
    }
1551

    
1552
    if(s->alternate_scan){
1553
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1554
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1555
    }else{
1556
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1557
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1558
    }
1559

    
1560
    /* composite display not parsed */
1561
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1562
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1563
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1564
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1565
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1566
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1567
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1568
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1569
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1570
}
1571

    
1572
static void mpeg_decode_extension(AVCodecContext *avctx,
1573
                                  const uint8_t *buf, int buf_size)
1574
{
1575
    Mpeg1Context *s1 = avctx->priv_data;
1576
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1577
    int ext_type;
1578

    
1579
    init_get_bits(&s->gb, buf, buf_size*8);
1580

    
1581
    ext_type = get_bits(&s->gb, 4);
1582
    switch(ext_type) {
1583
    case 0x1:
1584
        mpeg_decode_sequence_extension(s1);
1585
        break;
1586
    case 0x2:
1587
        mpeg_decode_sequence_display_extension(s1);
1588
        break;
1589
    case 0x3:
1590
        mpeg_decode_quant_matrix_extension(s);
1591
        break;
1592
    case 0x7:
1593
        mpeg_decode_picture_display_extension(s1);
1594
        break;
1595
    case 0x8:
1596
        mpeg_decode_picture_coding_extension(s1);
1597
        break;
1598
    }
1599
}
1600

    
1601
static void exchange_uv(MpegEncContext *s){
1602
    short * tmp = s->pblocks[4];
1603
    s->pblocks[4] = s->pblocks[5];
1604
    s->pblocks[5] = tmp;
1605
}
1606

    
1607
static int mpeg_field_start(MpegEncContext *s){
1608
    AVCodecContext *avctx= s->avctx;
1609
    Mpeg1Context *s1 = (Mpeg1Context*)s;
1610

    
1611
    /* start frame decoding */
1612
    if(s->first_field || s->picture_structure==PICT_FRAME){
1613
        if(MPV_frame_start(s, avctx) < 0)
1614
            return -1;
1615

    
1616
        ff_er_frame_start(s);
1617

    
1618
        /* first check if we must repeat the frame */
1619
        s->current_picture_ptr->repeat_pict = 0;
1620
        if (s->repeat_first_field) {
1621
            if (s->progressive_sequence) {
1622
                if (s->top_field_first)
1623
                    s->current_picture_ptr->repeat_pict = 4;
1624
                else
1625
                    s->current_picture_ptr->repeat_pict = 2;
1626
            } else if (s->progressive_frame) {
1627
                s->current_picture_ptr->repeat_pict = 1;
1628
            }
1629
        }
1630

    
1631
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
1632
    }else{ //second field
1633
            int i;
1634

    
1635
            if(!s->current_picture_ptr){
1636
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1637
                return -1;
1638
            }
1639

    
1640
            for(i=0; i<4; i++){
1641
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
1642
                if(s->picture_structure == PICT_BOTTOM_FIELD){
1643
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1644
                }
1645
            }
1646
    }
1647
#if CONFIG_MPEG_XVMC_DECODER
1648
// MPV_frame_start will call this function too,
1649
// but we need to call it on every field
1650
    if(s->avctx->xvmc_acceleration)
1651
         ff_xvmc_field_start(s,avctx);
1652
#endif
1653

    
1654
    return 0;
1655
}
1656

    
1657
#define DECODE_SLICE_ERROR -1
1658
#define DECODE_SLICE_OK 0
1659

    
1660
/**
1661
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1662
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1663
 *         DECODE_SLICE_OK if this slice is ok<br>
1664
 */
1665
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1666
                             const uint8_t **buf, int buf_size)
1667
{
1668
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1669
    AVCodecContext *avctx= s->avctx;
1670
    const int field_pic= s->picture_structure != PICT_FRAME;
1671
    const int lowres= s->avctx->lowres;
1672

    
1673
    s->resync_mb_x=
1674
    s->resync_mb_y= -1;
1675

    
1676
    if (mb_y<<field_pic >= s->mb_height){
1677
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1678
        return -1;
1679
    }
1680

    
1681
    init_get_bits(&s->gb, *buf, buf_size*8);
1682

    
1683
    ff_mpeg1_clean_buffers(s);
1684
    s->interlaced_dct = 0;
1685

    
1686
    s->qscale = get_qscale(s);
1687

    
1688
    if(s->qscale == 0){
1689
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1690
        return -1;
1691
    }
1692

    
1693
    /* extra slice info */
1694
    while (get_bits1(&s->gb) != 0) {
1695
        skip_bits(&s->gb, 8);
1696
    }
1697

    
1698
    s->mb_x=0;
1699

    
1700
    for(;;) {
1701
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1702
        if (code < 0){
1703
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1704
            return -1;
1705
        }
1706
        if (code >= 33) {
1707
            if (code == 33) {
1708
                s->mb_x += 33;
1709
            }
1710
            /* otherwise, stuffing, nothing to do */
1711
        } else {
1712
            s->mb_x += code;
1713
            break;
1714
        }
1715
    }
1716
    if(s->mb_x >= (unsigned)s->mb_width){
1717
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1718
        return -1;
1719
    }
1720

    
1721
    s->resync_mb_x= s->mb_x;
1722
    s->resync_mb_y= s->mb_y= mb_y;
1723
    s->mb_skip_run= 0;
1724
    ff_init_block_index(s);
1725

    
1726
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1727
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1728
             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",
1729
                 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],
1730
                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1731
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1732
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1733
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1734
        }
1735
    }
1736

    
1737
    for(;;) {
1738
#if CONFIG_MPEG_XVMC_DECODER
1739
        //If 1, we memcpy blocks in xvmcvideo.
1740
        if(s->avctx->xvmc_acceleration > 1)
1741
            ff_xvmc_init_block(s);//set s->block
1742
#endif
1743

    
1744
        if(mpeg_decode_mb(s, s->block) < 0)
1745
            return -1;
1746

    
1747
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1748
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1749
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
1750
            int motion_x, motion_y, dir, i;
1751
            if(field_pic && !s->first_field)
1752
                xy += wrap/2;
1753

    
1754
            for(i=0; i<2; i++){
1755
                for(dir=0; dir<2; dir++){
1756
                    if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1757
                        motion_x = motion_y = 0;
1758
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1759
                        motion_x = s->mv[dir][0][0];
1760
                        motion_y = s->mv[dir][0][1];
1761
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1762
                        motion_x = s->mv[dir][i][0];
1763
                        motion_y = s->mv[dir][i][1];
1764
                    }
1765

    
1766
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1767
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1768
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1769
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1770
                    s->current_picture.ref_index [dir][xy    ]=
1771
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1772
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1773
                }
1774
                xy += wrap;
1775
            }
1776
        }
1777

    
1778
        s->dest[0] += 16 >> lowres;
1779
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1780
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1781

    
1782
        MPV_decode_mb(s, s->block);
1783

    
1784
        if (++s->mb_x >= s->mb_width) {
1785
            const int mb_size= 16>>s->avctx->lowres;
1786

    
1787
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1788

    
1789
            s->mb_x = 0;
1790
            s->mb_y++;
1791

    
1792
            if(s->mb_y<<field_pic >= s->mb_height){
1793
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1794
                int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1795
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1796
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1797

    
1798
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1799
                   || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1800
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1801
                    return -1;
1802
                }else
1803
                    goto eos;
1804
            }
1805

    
1806
            ff_init_block_index(s);
1807
        }
1808

    
1809
        /* skip mb handling */
1810
        if (s->mb_skip_run == -1) {
1811
            /* read increment again */
1812
            s->mb_skip_run = 0;
1813
            for(;;) {
1814
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1815
                if (code < 0){
1816
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1817
                    return -1;
1818
                }
1819
                if (code >= 33) {
1820
                    if (code == 33) {
1821
                        s->mb_skip_run += 33;
1822
                    }else if(code == 35){
1823
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1824
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1825
                            return -1;
1826
                        }
1827
                        goto eos; /* end of slice */
1828
                    }
1829
                    /* otherwise, stuffing, nothing to do */
1830
                } else {
1831
                    s->mb_skip_run += code;
1832
                    break;
1833
                }
1834
            }
1835
            if(s->mb_skip_run){
1836
                int i;
1837
                if(s->pict_type == FF_I_TYPE){
1838
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1839
                    return -1;
1840
                }
1841

    
1842
                /* skip mb */
1843
                s->mb_intra = 0;
1844
                for(i=0;i<12;i++)
1845
                    s->block_last_index[i] = -1;
1846
                if(s->picture_structure == PICT_FRAME)
1847
                    s->mv_type = MV_TYPE_16X16;
1848
                else
1849
                    s->mv_type = MV_TYPE_FIELD;
1850
                if (s->pict_type == FF_P_TYPE) {
1851
                    /* if P type, zero motion vector is implied */
1852
                    s->mv_dir = MV_DIR_FORWARD;
1853
                    s->mv[0][0][0] = s->mv[0][0][1] = 0;
1854
                    s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1855
                    s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1856
                    s->field_select[0][0]= s->picture_structure - 1;
1857
                } else {
1858
                    /* if B type, reuse previous vectors and directions */
1859
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1860
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1861
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1862
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1863
                }
1864
            }
1865
        }
1866
    }
1867
eos: // end of slice
1868
    *buf += (get_bits_count(&s->gb)-1)/8;
1869
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1870
    return 0;
1871
}
1872

    
1873
static int slice_decode_thread(AVCodecContext *c, void *arg){
1874
    MpegEncContext *s= *(void**)arg;
1875
    const uint8_t *buf= s->gb.buffer;
1876
    int mb_y= s->start_mb_y;
1877

    
1878
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1879

    
1880
    for(;;){
1881
        uint32_t start_code;
1882
        int ret;
1883

    
1884
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1885
        emms_c();
1886
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1887
//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);
1888
        if(ret < 0){
1889
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1890
                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);
1891
        }else{
1892
            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);
1893
        }
1894

    
1895
        if(s->mb_y == s->end_mb_y)
1896
            return 0;
1897

    
1898
        start_code= -1;
1899
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1900
        mb_y= start_code - SLICE_MIN_START_CODE;
1901
        if(mb_y < 0 || mb_y >= s->end_mb_y)
1902
            return -1;
1903
    }
1904

    
1905
    return 0; //not reached
1906
}
1907

    
1908
/**
1909
 * Handles slice ends.
1910
 * @return 1 if it seems to be the last slice
1911
 */
1912
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1913
{
1914
    Mpeg1Context *s1 = avctx->priv_data;
1915
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1916

    
1917
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1918
        return 0;
1919

    
1920
#if CONFIG_MPEG_XVMC_DECODER
1921
    if(s->avctx->xvmc_acceleration)
1922
        ff_xvmc_field_end(s);
1923
#endif
1924
    /* end of slice reached */
1925
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1926
        /* end of image */
1927

    
1928
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1929

    
1930
        ff_er_frame_end(s);
1931

    
1932
        MPV_frame_end(s);
1933

    
1934
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1935
            *pict= *(AVFrame*)s->current_picture_ptr;
1936
            ff_print_debug_info(s, pict);
1937
        } else {
1938
            s->picture_number++;
1939
            /* latency of 1 frame for I- and P-frames */
1940
            /* XXX: use another variable than picture_number */
1941
            if (s->last_picture_ptr != NULL) {
1942
                *pict= *(AVFrame*)s->last_picture_ptr;
1943
                 ff_print_debug_info(s, pict);
1944
            }
1945
        }
1946

    
1947
        return 1;
1948
    } else {
1949
        return 0;
1950
    }
1951
}
1952

    
1953
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1954
                                 const uint8_t *buf, int buf_size)
1955
{
1956
    Mpeg1Context *s1 = avctx->priv_data;
1957
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1958
    int width,height;
1959
    int i, v, j;
1960

    
1961
    init_get_bits(&s->gb, buf, buf_size*8);
1962

    
1963
    width = get_bits(&s->gb, 12);
1964
    height = get_bits(&s->gb, 12);
1965
    if (width <= 0 || height <= 0)
1966
        return -1;
1967
    s->aspect_ratio_info= get_bits(&s->gb, 4);
1968
    if (s->aspect_ratio_info == 0) {
1969
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1970
        if (avctx->error_recognition >= FF_ER_COMPLIANT)
1971
            return -1;
1972
    }
1973
    s->frame_rate_index = get_bits(&s->gb, 4);
1974
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1975
        return -1;
1976
    s->bit_rate = get_bits(&s->gb, 18) * 400;
1977
    if (get_bits1(&s->gb) == 0) /* marker */
1978
        return -1;
1979
    s->width = width;
1980
    s->height = height;
1981

    
1982
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1983
    skip_bits(&s->gb, 1);
1984

    
1985
    /* get matrix */
1986
    if (get_bits1(&s->gb)) {
1987
        for(i=0;i<64;i++) {
1988
            v = get_bits(&s->gb, 8);
1989
            if(v==0){
1990
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1991
                return -1;
1992
            }
1993
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1994
            s->intra_matrix[j] = v;
1995
            s->chroma_intra_matrix[j] = v;
1996
        }
1997
#ifdef DEBUG
1998
        dprintf(s->avctx, "intra matrix present\n");
1999
        for(i=0;i<64;i++)
2000
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2001
        dprintf(s->avctx, "\n");
2002
#endif
2003
    } else {
2004
        for(i=0;i<64;i++) {
2005
            j = s->dsp.idct_permutation[i];
2006
            v = ff_mpeg1_default_intra_matrix[i];
2007
            s->intra_matrix[j] = v;
2008
            s->chroma_intra_matrix[j] = v;
2009
        }
2010
    }
2011
    if (get_bits1(&s->gb)) {
2012
        for(i=0;i<64;i++) {
2013
            v = get_bits(&s->gb, 8);
2014
            if(v==0){
2015
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2016
                return -1;
2017
            }
2018
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2019
            s->inter_matrix[j] = v;
2020
            s->chroma_inter_matrix[j] = v;
2021
        }
2022
#ifdef DEBUG
2023
        dprintf(s->avctx, "non-intra matrix present\n");
2024
        for(i=0;i<64;i++)
2025
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2026
        dprintf(s->avctx, "\n");
2027
#endif
2028
    } else {
2029
        for(i=0;i<64;i++) {
2030
            int j= s->dsp.idct_permutation[i];
2031
            v = ff_mpeg1_default_non_intra_matrix[i];
2032
            s->inter_matrix[j] = v;
2033
            s->chroma_inter_matrix[j] = v;
2034
        }
2035
    }
2036

    
2037
    if(show_bits(&s->gb, 23) != 0){
2038
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2039
        return -1;
2040
    }
2041

    
2042
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2043
    s->progressive_sequence = 1;
2044
    s->progressive_frame = 1;
2045
    s->picture_structure = PICT_FRAME;
2046
    s->frame_pred_frame_dct = 1;
2047
    s->chroma_format = 1;
2048
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2049
    avctx->sub_id = 1; /* indicates MPEG-1 */
2050
    s->out_format = FMT_MPEG1;
2051
    s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2052
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2053

    
2054
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2055
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2056
               s->avctx->rc_buffer_size, s->bit_rate);
2057

    
2058
    return 0;
2059
}
2060

    
2061
static int vcr2_init_sequence(AVCodecContext *avctx)
2062
{
2063
    Mpeg1Context *s1 = avctx->priv_data;
2064
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2065
    int i, v;
2066

    
2067
    /* start new MPEG-1 context decoding */
2068
    s->out_format = FMT_MPEG1;
2069
    if (s1->mpeg_enc_ctx_allocated) {
2070
        MPV_common_end(s);
2071
    }
2072
    s->width  = avctx->coded_width;
2073
    s->height = avctx->coded_height;
2074
    avctx->has_b_frames= 0; //true?
2075
    s->low_delay= 1;
2076

    
2077
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2078

    
2079
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
2080
        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2081
        if( avctx->idct_algo == FF_IDCT_AUTO )
2082
            avctx->idct_algo = FF_IDCT_SIMPLE;
2083

    
2084
    if (MPV_common_init(s) < 0)
2085
        return -1;
2086
    exchange_uv(s);//common init reset pblocks, so we swap them here
2087
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2088
    s1->mpeg_enc_ctx_allocated = 1;
2089

    
2090
    for(i=0;i<64;i++) {
2091
        int j= s->dsp.idct_permutation[i];
2092
        v = ff_mpeg1_default_intra_matrix[i];
2093
        s->intra_matrix[j] = v;
2094
        s->chroma_intra_matrix[j] = v;
2095

    
2096
        v = ff_mpeg1_default_non_intra_matrix[i];
2097
        s->inter_matrix[j] = v;
2098
        s->chroma_inter_matrix[j] = v;
2099
    }
2100

    
2101
    s->progressive_sequence = 1;
2102
    s->progressive_frame = 1;
2103
    s->picture_structure = PICT_FRAME;
2104
    s->frame_pred_frame_dct = 1;
2105
    s->chroma_format = 1;
2106
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2107
    avctx->sub_id = 2; /* indicates MPEG-2 */
2108
    return 0;
2109
}
2110

    
2111

    
2112
static void mpeg_decode_user_data(AVCodecContext *avctx,
2113
                                  const uint8_t *buf, int buf_size)
2114
{
2115
    const uint8_t *p;
2116
    int len, flags;
2117
    p = buf;
2118
    len = buf_size;
2119

    
2120
    /* we parse the DTG active format information */
2121
    if (len >= 5 &&
2122
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2123
        flags = p[4];
2124
        p += 5;
2125
        len -= 5;
2126
        if (flags & 0x80) {
2127
            /* skip event id */
2128
            if (len < 2)
2129
                return;
2130
            p += 2;
2131
            len -= 2;
2132
        }
2133
        if (flags & 0x40) {
2134
            if (len < 1)
2135
                return;
2136
            avctx->dtg_active_format = p[0] & 0x0f;
2137
        }
2138
    }
2139
}
2140

    
2141
static void mpeg_decode_gop(AVCodecContext *avctx,
2142
                            const uint8_t *buf, int buf_size){
2143
    Mpeg1Context *s1 = avctx->priv_data;
2144
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2145

    
2146
    int drop_frame_flag;
2147
    int time_code_hours, time_code_minutes;
2148
    int time_code_seconds, time_code_pictures;
2149
    int closed_gop, broken_link;
2150

    
2151
    init_get_bits(&s->gb, buf, buf_size*8);
2152

    
2153
    drop_frame_flag = get_bits1(&s->gb);
2154

    
2155
    time_code_hours=get_bits(&s->gb,5);
2156
    time_code_minutes = get_bits(&s->gb,6);
2157
    skip_bits1(&s->gb);//marker bit
2158
    time_code_seconds = get_bits(&s->gb,6);
2159
    time_code_pictures = get_bits(&s->gb,6);
2160

    
2161
    closed_gop  = get_bits1(&s->gb);
2162
    /*broken_link indicate that after editing the
2163
      reference frames of the first B-Frames after GOP I-Frame
2164
      are missing (open gop)*/
2165
    broken_link = get_bits1(&s->gb);
2166

    
2167
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2168
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2169
            time_code_hours, time_code_minutes, time_code_seconds,
2170
            time_code_pictures, closed_gop, broken_link);
2171
}
2172
/**
2173
 * Finds the end of the current frame in the bitstream.
2174
 * @return the position of the first byte of the next frame, or -1
2175
 */
2176
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2177
{
2178
    int i;
2179
    uint32_t state= pc->state;
2180

    
2181
    /* EOF considered as end of frame */
2182
    if (buf_size == 0)
2183
        return 0;
2184

    
2185
/*
2186
 0  frame start         -> 1/4
2187
 1  first_SEQEXT        -> 0/2
2188
 2  first field start   -> 3/0
2189
 3  second_SEQEXT       -> 2/0
2190
 4  searching end
2191
*/
2192

    
2193
    for(i=0; i<buf_size; i++){
2194
        assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2195
        if(pc->frame_start_found&1){
2196
            if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2197
                pc->frame_start_found--;
2198
            else if(state == EXT_START_CODE+2){
2199
                if((buf[i]&3) == 3) pc->frame_start_found= 0;
2200
                else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2201
            }
2202
            state++;
2203
        }else{
2204
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2205
            if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2206
                i++;
2207
                pc->frame_start_found=4;
2208
            }
2209
            if(state == SEQ_END_CODE){
2210
                pc->state=-1;
2211
                return i+1;
2212
            }
2213
            if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2214
                pc->frame_start_found= 0;
2215
            if(pc->frame_start_found<4 && state == EXT_START_CODE)
2216
                pc->frame_start_found++;
2217
            if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2218
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2219
                    pc->frame_start_found=0;
2220
                    pc->state=-1;
2221
                    return i-3;
2222
                }
2223
            }
2224
        }
2225
    }
2226
    pc->state= state;
2227
    return END_NOT_FOUND;
2228
}
2229

    
2230
static int decode_chunks(AVCodecContext *avctx,
2231
                             AVFrame *picture, int *data_size,
2232
                             const uint8_t *buf, int buf_size);
2233

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

    
2244
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2245
        /* special case for last picture */
2246
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2247
            *picture= *(AVFrame*)s2->next_picture_ptr;
2248
            s2->next_picture_ptr= NULL;
2249

    
2250
            *data_size = sizeof(AVFrame);
2251
        }
2252
        return buf_size;
2253
    }
2254

    
2255
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2256
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2257

    
2258
        if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2259
            return buf_size;
2260
    }
2261

    
2262
#if 0
2263
    if (s->repeat_field % 2 == 1) {
2264
        s->repeat_field++;
2265
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2266
        //        s2->picture_number, s->repeat_field);
2267
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2268
            *data_size = sizeof(AVPicture);
2269
            goto the_end;
2270
        }
2271
    }
2272
#endif
2273

    
2274
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2275
        vcr2_init_sequence(avctx);
2276

    
2277
    s->slice_count= 0;
2278

    
2279
    if(avctx->extradata && !avctx->frame_number)
2280
        decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2281

    
2282
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
2283
}
2284

    
2285
static int decode_chunks(AVCodecContext *avctx,
2286
                             AVFrame *picture, int *data_size,
2287
                             const uint8_t *buf, int buf_size)
2288
{
2289
    Mpeg1Context *s = avctx->priv_data;
2290
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2291
    const uint8_t *buf_ptr = buf;
2292
    const uint8_t *buf_end = buf + buf_size;
2293
    int ret, input_size;
2294

    
2295
    for(;;) {
2296
        /* find next start code */
2297
        uint32_t start_code = -1;
2298
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2299
        if (start_code > 0x1ff){
2300
            if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2301
                if(avctx->thread_count > 1){
2302
                    int i;
2303

    
2304
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2305
                    for(i=0; i<s->slice_count; i++)
2306
                        s2->error_count += s2->thread_context[i]->error_count;
2307
                }
2308

    
2309
                if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2310
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2311

    
2312
                if (slice_end(avctx, picture)) {
2313
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2314
                        *data_size = sizeof(AVPicture);
2315
                }
2316
            }
2317
            s2->pict_type= 0;
2318
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2319
        }
2320

    
2321
        input_size = buf_end - buf_ptr;
2322

    
2323
        if(avctx->debug & FF_DEBUG_STARTCODE){
2324
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2325
        }
2326

    
2327
        /* prepare data for next start code */
2328
        switch(start_code) {
2329
        case SEQ_START_CODE:
2330
            mpeg1_decode_sequence(avctx, buf_ptr,
2331
                                    input_size);
2332
            break;
2333

    
2334
        case PICTURE_START_CODE:
2335
            /* we have a complete image: we try to decompress it */
2336
            if(mpeg1_decode_picture(avctx,
2337
                                    buf_ptr, input_size) < 0)
2338
                s2->pict_type=0;
2339
            break;
2340
        case EXT_START_CODE:
2341
            mpeg_decode_extension(avctx,
2342
                                    buf_ptr, input_size);
2343
            break;
2344
        case USER_START_CODE:
2345
            mpeg_decode_user_data(avctx,
2346
                                    buf_ptr, input_size);
2347
            break;
2348
        case GOP_START_CODE:
2349
            s2->first_field=0;
2350
            mpeg_decode_gop(avctx,
2351
                                    buf_ptr, input_size);
2352
            break;
2353
        default:
2354
            if (start_code >= SLICE_MIN_START_CODE &&
2355
                start_code <= SLICE_MAX_START_CODE) {
2356
                int mb_y= start_code - SLICE_MIN_START_CODE;
2357

    
2358
                if(s2->last_picture_ptr==NULL){
2359
                /* Skip B-frames if we do not have reference frames. */
2360
                    if(s2->pict_type==FF_B_TYPE) break;
2361
                }
2362
                if(s2->next_picture_ptr==NULL){
2363
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2364
                    if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2365
                }
2366
                /* Skip B-frames if we are in a hurry. */
2367
                if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2368
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2369
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2370
                    || avctx->skip_frame >= AVDISCARD_ALL)
2371
                    break;
2372
                /* Skip everything if we are in a hurry>=5. */
2373
                if(avctx->hurry_up>=5) break;
2374

    
2375
                if (!s->mpeg_enc_ctx_allocated) break;
2376

    
2377
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2378
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2379
                        break;
2380
                }
2381

    
2382
                if(!s2->pict_type){
2383
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2384
                    break;
2385
                }
2386

    
2387
                if(s2->first_slice){
2388
                    s2->first_slice=0;
2389
                            if(mpeg_field_start(s2) < 0)
2390
                        return -1;
2391
                    }
2392
                if(!s2->current_picture_ptr){
2393
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2394
                    return -1;
2395
                }
2396

    
2397
                if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2398
                    s->slice_count++;
2399
                    break;
2400
                }
2401

    
2402
                if(avctx->thread_count > 1){
2403
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2404
                    if(threshold <= mb_y){
2405
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2406

    
2407
                        thread_context->start_mb_y= mb_y;
2408
                        thread_context->end_mb_y  = s2->mb_height;
2409
                        if(s->slice_count){
2410
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2411
                            ff_update_duplicate_context(thread_context, s2);
2412
                        }
2413
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2414
                        s->slice_count++;
2415
                    }
2416
                    buf_ptr += 2; //FIXME add minimum number of bytes per slice
2417
                }else{
2418
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2419
                    emms_c();
2420

    
2421
                    if(ret < 0){
2422
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2423
                            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);
2424
                    }else{
2425
                        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);
2426
                    }
2427
                }
2428
            }
2429
            break;
2430
        }
2431
    }
2432
}
2433

    
2434
static int mpeg_decode_end(AVCodecContext *avctx)
2435
{
2436
    Mpeg1Context *s = avctx->priv_data;
2437

    
2438
    if (s->mpeg_enc_ctx_allocated)
2439
        MPV_common_end(&s->mpeg_enc_ctx);
2440
    return 0;
2441
}
2442

    
2443
AVCodec mpeg1video_decoder = {
2444
    "mpeg1video",
2445
    CODEC_TYPE_VIDEO,
2446
    CODEC_ID_MPEG1VIDEO,
2447
    sizeof(Mpeg1Context),
2448
    mpeg_decode_init,
2449
    NULL,
2450
    mpeg_decode_end,
2451
    mpeg_decode_frame,
2452
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2453
    .flush= ff_mpeg_flush,
2454
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2455
};
2456

    
2457
AVCodec mpeg2video_decoder = {
2458
    "mpeg2video",
2459
    CODEC_TYPE_VIDEO,
2460
    CODEC_ID_MPEG2VIDEO,
2461
    sizeof(Mpeg1Context),
2462
    mpeg_decode_init,
2463
    NULL,
2464
    mpeg_decode_end,
2465
    mpeg_decode_frame,
2466
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2467
    .flush= ff_mpeg_flush,
2468
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2469
};
2470

    
2471
//legacy decoder
2472
AVCodec mpegvideo_decoder = {
2473
    "mpegvideo",
2474
    CODEC_TYPE_VIDEO,
2475
    CODEC_ID_MPEG2VIDEO,
2476
    sizeof(Mpeg1Context),
2477
    mpeg_decode_init,
2478
    NULL,
2479
    mpeg_decode_end,
2480
    mpeg_decode_frame,
2481
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2482
    .flush= ff_mpeg_flush,
2483
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2484
};
2485

    
2486
#if CONFIG_MPEG_XVMC_DECODER
2487
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2488
    Mpeg1Context *s;
2489

    
2490
    if( avctx->thread_count > 1)
2491
        return -1;
2492
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2493
        return -1;
2494
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2495
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2496
    }
2497
    mpeg_decode_init(avctx);
2498
    s = avctx->priv_data;
2499

    
2500
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2501
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2502

    
2503
    return 0;
2504
}
2505

    
2506
AVCodec mpeg_xvmc_decoder = {
2507
    "mpegvideo_xvmc",
2508
    CODEC_TYPE_VIDEO,
2509
    CODEC_ID_MPEG2VIDEO_XVMC,
2510
    sizeof(Mpeg1Context),
2511
    mpeg_mc_decode_init,
2512
    NULL,
2513
    mpeg_decode_end,
2514
    mpeg_decode_frame,
2515
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2516
    .flush= ff_mpeg_flush,
2517
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),
2518
};
2519

    
2520
#endif
2521

    
2522
#if CONFIG_MPEG_VDPAU_DECODER
2523
AVCodec mpeg_vdpau_decoder = {
2524
    "mpegvideo_vdpau",
2525
    CODEC_TYPE_VIDEO,
2526
    CODEC_ID_MPEG2VIDEO,
2527
    sizeof(Mpeg1Context),
2528
    mpeg_decode_init,
2529
    NULL,
2530
    mpeg_decode_end,
2531
    mpeg_decode_frame,
2532
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2533
    .flush= ff_mpeg_flush,
2534
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2535
};
2536
#endif
2537

    
2538
#if CONFIG_MPEG1_VDPAU_DECODER
2539
AVCodec mpeg1_vdpau_decoder = {
2540
    "mpeg1video_vdpau",
2541
    CODEC_TYPE_VIDEO,
2542
    CODEC_ID_MPEG1VIDEO,
2543
    sizeof(Mpeg1Context),
2544
    mpeg_decode_init,
2545
    NULL,
2546
    mpeg_decode_end,
2547
    mpeg_decode_frame,
2548
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2549
    .flush= ff_mpeg_flush,
2550
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2551
};
2552
#endif
2553