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ffmpeg / libavcodec / mpeg12.c @ 849f1035

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1
/*
2
 * MPEG1 codec / MPEG2 decoder
3
 * Copyright (c) 2000,2001 Fabrice Bellard.
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
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 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

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

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

    
33
#include "mpeg12data.h"
34

    
35
//#undef NDEBUG
36
//#include <assert.h>
37

    
38

    
39
/* Start codes. */
40
#define SEQ_END_CODE            0x000001b7
41
#define SEQ_START_CODE          0x000001b3
42
#define GOP_START_CODE          0x000001b8
43
#define PICTURE_START_CODE      0x00000100
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#define SLICE_MIN_START_CODE    0x00000101
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#define SLICE_MAX_START_CODE    0x000001af
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#define EXT_START_CODE          0x000001b5
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#define USER_START_CODE         0x000001b2
48

    
49
#define DC_VLC_BITS 9
50
#define MV_VLC_BITS 9
51
#define MBINCR_VLC_BITS 9
52
#define MB_PAT_VLC_BITS 9
53
#define MB_PTYPE_VLC_BITS 6
54
#define MB_BTYPE_VLC_BITS 6
55
#define TEX_VLC_BITS 9
56

    
57
#ifdef CONFIG_ENCODERS
58
static void mpeg1_encode_block(MpegEncContext *s,
59
                         DCTELEM *block,
60
                         int component);
61
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
62
#endif //CONFIG_ENCODERS
63
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
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static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
70
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
72
                                        int n);
73
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
75
                                    int n);
76
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
77
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
78
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
79
static void exchange_uv(MpegEncContext *s);
80

    
81
#ifdef HAVE_XVMC
82
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
83
extern int XVMC_field_end(MpegEncContext *s);
84
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
85
extern void XVMC_init_block(MpegEncContext *s);//set s->block
86
#endif
87

    
88
static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
89
static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
90
static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
91
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
92
                                           PIX_FMT_XVMC_MPEG2_IDCT,
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                                           PIX_FMT_XVMC_MPEG2_MC,
94
                                           -1};
95
#ifdef CONFIG_ENCODERS
96
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
97
static uint8_t fcode_tab[MAX_MV*2+1];
98

    
99
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
100
static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
101

    
102
/* simple include everything table for dc, first byte is bits number next 3 are code*/
103
static uint32_t mpeg1_lum_dc_uni[512];
104
static uint32_t mpeg1_chr_dc_uni[512];
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106
static uint8_t mpeg1_index_run[2][64];
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static int8_t mpeg1_max_level[2][64];
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#endif //CONFIG_ENCODERS
109

    
110
static void init_2d_vlc_rl(RLTable *rl, int use_static)
111
{
112
    int i;
113

    
114
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
115
             &rl->table_vlc[0][1], 4, 2,
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             &rl->table_vlc[0][0], 4, 2, use_static);
117

    
118
    if(use_static)
119
        rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120
    else
121
        rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
122

    
123
    for(i=0; i<rl->vlc.table_size; i++){
124
        int code= rl->vlc.table[i][0];
125
        int len = rl->vlc.table[i][1];
126
        int level, run;
127

    
128
        if(len==0){ // illegal code
129
            run= 65;
130
            level= MAX_LEVEL;
131
        }else if(len<0){ //more bits needed
132
            run= 0;
133
            level= code;
134
        }else{
135
            if(code==rl->n){ //esc
136
                run= 65;
137
                level= 0;
138
            }else if(code==rl->n+1){ //eob
139
                run= 0;
140
                level= 127;
141
            }else{
142
                run=   rl->table_run  [code] + 1;
143
                level= rl->table_level[code];
144
            }
145
        }
146
        rl->rl_vlc[0][i].len= len;
147
        rl->rl_vlc[0][i].level= level;
148
        rl->rl_vlc[0][i].run= run;
149
    }
150
}
151

    
152
#ifdef CONFIG_ENCODERS
153
static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
154
    int i;
155

    
156
    for(i=0; i<128; i++){
157
        int level= i-64;
158
        int run;
159
        for(run=0; run<64; run++){
160
            int len, bits, code;
161

    
162
            int alevel= FFABS(level);
163
            int sign= (level>>31)&1;
164

    
165
            if (alevel > rl->max_level[0][run])
166
                code= 111; /*rl->n*/
167
            else
168
                code= rl->index_run[0][run] + alevel - 1;
169

    
170
            if (code < 111 /* rl->n */) {
171
                /* store the vlc & sign at once */
172
                len=   rl->table_vlc[code][1]+1;
173
                bits= (rl->table_vlc[code][0]<<1) + sign;
174
            } else {
175
                len=  rl->table_vlc[111/*rl->n*/][1]+6;
176
                bits= rl->table_vlc[111/*rl->n*/][0]<<6;
177

    
178
                bits|= run;
179
                if (alevel < 128) {
180
                    bits<<=8; len+=8;
181
                    bits|= level & 0xff;
182
                } else {
183
                    bits<<=16; len+=16;
184
                    bits|= level & 0xff;
185
                    if (level < 0) {
186
                        bits|= 0x8001 + level + 255;
187
                    } else {
188
                        bits|= level & 0xffff;
189
                    }
190
                }
191
            }
192

    
193
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
194
        }
195
    }
196
}
197

    
198

    
199
static int find_frame_rate_index(MpegEncContext *s){
200
    int i;
201
    int64_t dmin= INT64_MAX;
202
    int64_t d;
203

    
204
    for(i=1;i<14;i++) {
205
        int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
206
        int64_t n1= 1001LL*s->avctx->time_base.den;
207
        if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
208

    
209
        d = FFABS(n0 - n1);
210
        if(d < dmin){
211
            dmin=d;
212
            s->frame_rate_index= i;
213
        }
214
    }
215
    if(dmin)
216
        return -1;
217
    else
218
        return 0;
219
}
220

    
221
static int encode_init(AVCodecContext *avctx)
222
{
223
    MpegEncContext *s = avctx->priv_data;
224

    
225
    if(MPV_encode_init(avctx) < 0)
226
        return -1;
227

    
228
    if(find_frame_rate_index(s) < 0){
229
        if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
230
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
231
            return -1;
232
        }else{
233
            av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
234
        }
235
    }
236

    
237
    if(avctx->profile == FF_PROFILE_UNKNOWN)
238
        avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
239

    
240
    if(avctx->level == FF_LEVEL_UNKNOWN)
241
        avctx->level = s->chroma_format == CHROMA_420 ? 8 : 5;
242

    
243
    if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
244
        av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
245
        return -1;
246
    }
247

    
248
    return 0;
249
}
250

    
251
static void put_header(MpegEncContext *s, int header)
252
{
253
    align_put_bits(&s->pb);
254
    put_bits(&s->pb, 16, header>>16);
255
    put_bits(&s->pb, 16, header&0xFFFF);
256
}
257

    
258
/* put sequence header if needed */
259
static void mpeg1_encode_sequence_header(MpegEncContext *s)
260
{
261
        unsigned int vbv_buffer_size;
262
        unsigned int fps, v;
263
        int i;
264
        uint64_t time_code;
265
        float best_aspect_error= 1E10;
266
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
267
        int constraint_parameter_flag;
268

    
269
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
270

    
271
        if (s->current_picture.key_frame) {
272
            AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
273

    
274
            /* mpeg1 header repeated every gop */
275
            put_header(s, SEQ_START_CODE);
276

    
277
            put_bits(&s->pb, 12, s->width);
278
            put_bits(&s->pb, 12, s->height);
279

    
280
            for(i=1; i<15; i++){
281
                float error= aspect_ratio;
282
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
283
                    error-= 1.0/mpeg1_aspect[i];
284
                else
285
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
286

    
287
                error= FFABS(error);
288

    
289
                if(error < best_aspect_error){
290
                    best_aspect_error= error;
291
                    s->aspect_ratio_info= i;
292
                }
293
            }
294

    
295
            put_bits(&s->pb, 4, s->aspect_ratio_info);
296
            put_bits(&s->pb, 4, s->frame_rate_index);
297

    
298
            if(s->avctx->rc_max_rate){
299
                v = (s->avctx->rc_max_rate + 399) / 400;
300
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
301
                    v = 0x3ffff;
302
            }else{
303
                v= 0x3FFFF;
304
            }
305

    
306
            if(s->avctx->rc_buffer_size)
307
                vbv_buffer_size = s->avctx->rc_buffer_size;
308
            else
309
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
310
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
311
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
312

    
313
            put_bits(&s->pb, 18, v & 0x3FFFF);
314
            put_bits(&s->pb, 1, 1); /* marker */
315
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
316

    
317
            constraint_parameter_flag=
318
                s->width <= 768 && s->height <= 576 &&
319
                s->mb_width * s->mb_height <= 396 &&
320
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
321
                framerate.num <= framerate.den*30 &&
322
                s->avctx->me_range && s->avctx->me_range < 128 &&
323
                vbv_buffer_size <= 20 &&
324
                v <= 1856000/400 &&
325
                s->codec_id == CODEC_ID_MPEG1VIDEO;
326

    
327
            put_bits(&s->pb, 1, constraint_parameter_flag);
328

    
329
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
330
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
331

    
332
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
333
                put_header(s, EXT_START_CODE);
334
                put_bits(&s->pb, 4, 1); //seq ext
335

    
336
                put_bits(&s->pb, 1, s->chroma_format == CHROMA_422); //escx
337

    
338
                put_bits(&s->pb, 3, s->avctx->profile); //profile
339
                put_bits(&s->pb, 4, s->avctx->level); //level
340

    
341
                put_bits(&s->pb, 1, s->progressive_sequence);
342
                put_bits(&s->pb, 2, s->chroma_format);
343
                put_bits(&s->pb, 2, 0); //horizontal size ext
344
                put_bits(&s->pb, 2, 0); //vertical size ext
345
                put_bits(&s->pb, 12, v>>18); //bitrate ext
346
                put_bits(&s->pb, 1, 1); //marker
347
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
348
                put_bits(&s->pb, 1, s->low_delay);
349
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
350
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
351
            }
352

    
353
            put_header(s, GOP_START_CODE);
354
            put_bits(&s->pb, 1, !!(s->avctx->flags & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
355
            /* time code : we must convert from the real frame rate to a
356
               fake mpeg frame rate in case of low frame rate */
357
            fps = (framerate.num + framerate.den/2)/ framerate.den;
358
            time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
359

    
360
            s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
361
            if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
362
                /* only works for NTSC 29.97 */
363
                int d = time_code / 17982;
364
                int m = time_code % 17982;
365
                //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
366
                time_code += 18 * d + 2 * ((m - 2) / 1798);
367
            }
368
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
369
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
370
            put_bits(&s->pb, 1, 1);
371
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
372
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
373
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
374
            put_bits(&s->pb, 1, 0); /* broken link */
375
        }
376
}
377

    
378
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
379
    while (run >= 33) {
380
        put_bits(&s->pb, 11, 0x008);
381
        run -= 33;
382
    }
383
    put_bits(&s->pb, mbAddrIncrTable[run][1],
384
             mbAddrIncrTable[run][0]);
385
}
386
#endif //CONFIG_ENCODERS
387

    
388
static void common_init(MpegEncContext *s)
389
{
390

    
391
    s->y_dc_scale_table=
392
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
393

    
394
}
395

    
396
void ff_mpeg1_clean_buffers(MpegEncContext *s){
397
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
398
    s->last_dc[1] = s->last_dc[0];
399
    s->last_dc[2] = s->last_dc[0];
400
    memset(s->last_mv, 0, sizeof(s->last_mv));
401
}
402

    
403
#ifdef CONFIG_ENCODERS
404

    
405
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
406
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
407
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
408
    put_bits(&s->pb, 1, 0); /* slice extra information */
409
}
410

    
411
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
412
{
413
    mpeg1_encode_sequence_header(s);
414

    
415
    /* mpeg1 picture header */
416
    put_header(s, PICTURE_START_CODE);
417
    /* temporal reference */
418

    
419
    // RAL: s->picture_number instead of s->fake_picture_number
420
    put_bits(&s->pb, 10, (s->picture_number -
421
                          s->gop_picture_number) & 0x3ff);
422
    put_bits(&s->pb, 3, s->pict_type);
423

    
424
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
425
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
426

    
427
    // RAL: Forward f_code also needed for B frames
428
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
429
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
430
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
431
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
432
        else
433
            put_bits(&s->pb, 3, 7); /* forward_f_code */
434
    }
435

    
436
    // RAL: Backward f_code necessary for B frames
437
    if (s->pict_type == B_TYPE) {
438
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
439
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
440
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
441
        else
442
            put_bits(&s->pb, 3, 7); /* backward_f_code */
443
    }
444

    
445
    put_bits(&s->pb, 1, 0); /* extra bit picture */
446

    
447
    s->frame_pred_frame_dct = 1;
448
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
449
        put_header(s, EXT_START_CODE);
450
        put_bits(&s->pb, 4, 8); //pic ext
451
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
452
            put_bits(&s->pb, 4, s->f_code);
453
            put_bits(&s->pb, 4, s->f_code);
454
        }else{
455
            put_bits(&s->pb, 8, 255);
456
        }
457
        if (s->pict_type == B_TYPE) {
458
            put_bits(&s->pb, 4, s->b_code);
459
            put_bits(&s->pb, 4, s->b_code);
460
        }else{
461
            put_bits(&s->pb, 8, 255);
462
        }
463
        put_bits(&s->pb, 2, s->intra_dc_precision);
464

    
465
        assert(s->picture_structure == PICT_FRAME);
466
        put_bits(&s->pb, 2, s->picture_structure);
467
        if (s->progressive_sequence) {
468
            put_bits(&s->pb, 1, 0); /* no repeat */
469
        } else {
470
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
471
        }
472
        /* XXX: optimize the generation of this flag with entropy
473
           measures */
474
        s->frame_pred_frame_dct = s->progressive_sequence;
475

    
476
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
477
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
478
        put_bits(&s->pb, 1, s->q_scale_type);
479
        put_bits(&s->pb, 1, s->intra_vlc_format);
480
        put_bits(&s->pb, 1, s->alternate_scan);
481
        put_bits(&s->pb, 1, s->repeat_first_field);
482
        s->progressive_frame = s->progressive_sequence;
483
        put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
484
        put_bits(&s->pb, 1, s->progressive_frame);
485
        put_bits(&s->pb, 1, 0); //composite_display_flag
486
    }
487
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
488
        int i;
489

    
490
        put_header(s, USER_START_CODE);
491
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
492
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
493
        }
494
    }
495

    
496
    s->mb_y=0;
497
    ff_mpeg1_encode_slice_header(s);
498
}
499

    
500
static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
501
                                int has_mv, int field_motion)
502
{
503
    put_bits(&s->pb, n, bits);
504
    if (!s->frame_pred_frame_dct) {
505
        if (has_mv)
506
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
507
        put_bits(&s->pb, 1, s->interlaced_dct);
508
    }
509
}
510

    
511
static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
512
                                                   DCTELEM block[6][64],
513
                                                   int motion_x, int motion_y,
514
                                                   int mb_block_count)
515
{
516
    int i, cbp;
517
    const int mb_x = s->mb_x;
518
    const int mb_y = s->mb_y;
519
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
520

    
521
    /* compute cbp */
522
    cbp = 0;
523
    for(i=0;i<mb_block_count;i++) {
524
        if (s->block_last_index[i] >= 0)
525
            cbp |= 1 << (mb_block_count - 1 - i);
526
    }
527

    
528
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
529
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
530
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
531
        (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
532
        ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
533
        s->mb_skip_run++;
534
        s->qscale -= s->dquant;
535
        s->skip_count++;
536
        s->misc_bits++;
537
        s->last_bits++;
538
        if(s->pict_type == P_TYPE){
539
            s->last_mv[0][1][0]= s->last_mv[0][0][0]=
540
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
541
        }
542
    } else {
543
        if(first_mb){
544
            assert(s->mb_skip_run == 0);
545
            encode_mb_skip_run(s, s->mb_x);
546
        }else{
547
            encode_mb_skip_run(s, s->mb_skip_run);
548
        }
549

    
550
        if (s->pict_type == I_TYPE) {
551
            if(s->dquant && cbp){
552
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
553
                put_bits(&s->pb, 5, s->qscale);
554
            }else{
555
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
556
                s->qscale -= s->dquant;
557
            }
558
            s->misc_bits+= get_bits_diff(s);
559
            s->i_count++;
560
        } else if (s->mb_intra) {
561
            if(s->dquant && cbp){
562
                put_mb_modes(s, 6, 0x01, 0, 0);
563
                put_bits(&s->pb, 5, s->qscale);
564
            }else{
565
                put_mb_modes(s, 5, 0x03, 0, 0);
566
                s->qscale -= s->dquant;
567
            }
568
            s->misc_bits+= get_bits_diff(s);
569
            s->i_count++;
570
            memset(s->last_mv, 0, sizeof(s->last_mv));
571
        } else if (s->pict_type == P_TYPE) {
572
            if(s->mv_type == MV_TYPE_16X16){
573
                if (cbp != 0) {
574
                    if ((motion_x|motion_y) == 0) {
575
                        if(s->dquant){
576
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
577
                            put_bits(&s->pb, 5, s->qscale);
578
                        }else{
579
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
580
                        }
581
                        s->misc_bits+= get_bits_diff(s);
582
                    } else {
583
                        if(s->dquant){
584
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
585
                            put_bits(&s->pb, 5, s->qscale);
586
                        }else{
587
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
588
                        }
589
                        s->misc_bits+= get_bits_diff(s);
590
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
591
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
592
                        s->mv_bits+= get_bits_diff(s);
593
                    }
594
                } else {
595
                    put_bits(&s->pb, 3, 1); /* motion only */
596
                    if (!s->frame_pred_frame_dct)
597
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
598
                    s->misc_bits+= get_bits_diff(s);
599
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
600
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
601
                    s->qscale -= s->dquant;
602
                    s->mv_bits+= get_bits_diff(s);
603
                }
604
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
605
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
606
            }else{
607
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
608

    
609
                if (cbp) {
610
                    if(s->dquant){
611
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
612
                        put_bits(&s->pb, 5, s->qscale);
613
                    }else{
614
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
615
                    }
616
                } else {
617
                    put_bits(&s->pb, 3, 1); /* motion only */
618
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
619
                    s->qscale -= s->dquant;
620
                }
621
                s->misc_bits+= get_bits_diff(s);
622
                for(i=0; i<2; i++){
623
                    put_bits(&s->pb, 1, s->field_select[0][i]);
624
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
625
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
626
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
627
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
628
                }
629
                s->mv_bits+= get_bits_diff(s);
630
            }
631
            if(cbp) {
632
                if (s->chroma_y_shift) {
633
                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
634
                } else {
635
                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
636
                    put_bits(&s->pb, 2, cbp & 3);
637
                }
638
            }
639
            s->f_count++;
640
        } else{
641
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
642

    
643
            if(s->mv_type == MV_TYPE_16X16){
644
                if (cbp){    // With coded bloc pattern
645
                    if (s->dquant) {
646
                        if(s->mv_dir == MV_DIR_FORWARD)
647
                            put_mb_modes(s, 6, 3, 1, 0);
648
                        else
649
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
650
                        put_bits(&s->pb, 5, s->qscale);
651
                    } else {
652
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
653
                    }
654
                }else{    // No coded bloc pattern
655
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
656
                    if (!s->frame_pred_frame_dct)
657
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
658
                    s->qscale -= s->dquant;
659
                }
660
                s->misc_bits += get_bits_diff(s);
661
                if (s->mv_dir&MV_DIR_FORWARD){
662
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
663
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
664
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
665
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
666
                    s->f_count++;
667
                }
668
                if (s->mv_dir&MV_DIR_BACKWARD){
669
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
670
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
671
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
672
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
673
                    s->b_count++;
674
                }
675
            }else{
676
                assert(s->mv_type == MV_TYPE_FIELD);
677
                assert(!s->frame_pred_frame_dct);
678
                if (cbp){    // With coded bloc pattern
679
                    if (s->dquant) {
680
                        if(s->mv_dir == MV_DIR_FORWARD)
681
                            put_mb_modes(s, 6, 3, 1, 1);
682
                        else
683
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
684
                        put_bits(&s->pb, 5, s->qscale);
685
                    } else {
686
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
687
                    }
688
                }else{    // No coded bloc pattern
689
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
690
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
691
                    s->qscale -= s->dquant;
692
                }
693
                s->misc_bits += get_bits_diff(s);
694
                if (s->mv_dir&MV_DIR_FORWARD){
695
                    for(i=0; i<2; i++){
696
                        put_bits(&s->pb, 1, s->field_select[0][i]);
697
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
698
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
699
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
700
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
701
                    }
702
                    s->f_count++;
703
                }
704
                if (s->mv_dir&MV_DIR_BACKWARD){
705
                    for(i=0; i<2; i++){
706
                        put_bits(&s->pb, 1, s->field_select[1][i]);
707
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
708
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
709
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
710
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
711
                    }
712
                    s->b_count++;
713
                }
714
            }
715
            s->mv_bits += get_bits_diff(s);
716
            if(cbp) {
717
                if (s->chroma_y_shift) {
718
                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
719
                } else {
720
                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
721
                    put_bits(&s->pb, 2, cbp & 3);
722
                }
723
            }
724
        }
725
        for(i=0;i<mb_block_count;i++) {
726
            if (cbp & (1 << (mb_block_count - 1 - i))) {
727
                mpeg1_encode_block(s, block[i], i);
728
            }
729
        }
730
        s->mb_skip_run = 0;
731
        if(s->mb_intra)
732
            s->i_tex_bits+= get_bits_diff(s);
733
        else
734
            s->p_tex_bits+= get_bits_diff(s);
735
    }
736
}
737

    
738
void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
739
{
740
    if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
741
    else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
742
}
743

    
744
// RAL: Parameter added: f_or_b_code
745
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
746
{
747
    int code, bit_size, l, bits, range, sign;
748

    
749
    if (val == 0) {
750
        /* zero vector */
751
        code = 0;
752
        put_bits(&s->pb,
753
                 mbMotionVectorTable[0][1],
754
                 mbMotionVectorTable[0][0]);
755
    } else {
756
        bit_size = f_or_b_code - 1;
757
        range = 1 << bit_size;
758
        /* modulo encoding */
759
        l= INT_BIT - 5 - bit_size;
760
        val= (val<<l)>>l;
761

    
762
        if (val >= 0) {
763
            val--;
764
            code = (val >> bit_size) + 1;
765
            bits = val & (range - 1);
766
            sign = 0;
767
        } else {
768
            val = -val;
769
            val--;
770
            code = (val >> bit_size) + 1;
771
            bits = val & (range - 1);
772
            sign = 1;
773
        }
774

    
775
        assert(code > 0 && code <= 16);
776

    
777
        put_bits(&s->pb,
778
                 mbMotionVectorTable[code][1],
779
                 mbMotionVectorTable[code][0]);
780

    
781
        put_bits(&s->pb, 1, sign);
782
        if (bit_size > 0) {
783
            put_bits(&s->pb, bit_size, bits);
784
        }
785
    }
786
}
787

    
788
void ff_mpeg1_encode_init(MpegEncContext *s)
789
{
790
    static int done=0;
791

    
792
    common_init(s);
793

    
794
    if(!done){
795
        int f_code;
796
        int mv;
797
        int i;
798

    
799
        done=1;
800
        init_rl(&rl_mpeg1, 1);
801
        if(s->intra_vlc_format)
802
            init_rl(&rl_mpeg2, 1);
803

    
804
        for(i=0; i<64; i++)
805
        {
806
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
807
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
808
        }
809

    
810
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
811
        if(s->intra_vlc_format)
812
            init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
813

    
814
        /* build unified dc encoding tables */
815
        for(i=-255; i<256; i++)
816
        {
817
                int adiff, index;
818
                int bits, code;
819
                int diff=i;
820

    
821
                adiff = FFABS(diff);
822
                if(diff<0) diff--;
823
                index = av_log2(2*adiff);
824

    
825
                bits= vlc_dc_lum_bits[index] + index;
826
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
827
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
828

    
829
                bits= vlc_dc_chroma_bits[index] + index;
830
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
831
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
832
        }
833

    
834
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
835

    
836
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
837
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
838
                int len;
839

    
840
                if(mv==0) len= mbMotionVectorTable[0][1];
841
                else{
842
                    int val, bit_size, range, code;
843

    
844
                    bit_size = f_code - 1;
845
                    range = 1 << bit_size;
846

    
847
                    val=mv;
848
                    if (val < 0)
849
                        val = -val;
850
                    val--;
851
                    code = (val >> bit_size) + 1;
852
                    if(code<17){
853
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
854
                    }else{
855
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
856
                    }
857
                }
858

    
859
                mv_penalty[f_code][mv+MAX_MV]= len;
860
            }
861
        }
862

    
863

    
864
        for(f_code=MAX_FCODE; f_code>0; f_code--){
865
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
866
                fcode_tab[mv+MAX_MV]= f_code;
867
            }
868
        }
869
    }
870
    s->me.mv_penalty= mv_penalty;
871
    s->fcode_tab= fcode_tab;
872
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
873
        s->min_qcoeff=-255;
874
        s->max_qcoeff= 255;
875
    }else{
876
        s->min_qcoeff=-2047;
877
        s->max_qcoeff= 2047;
878
    }
879
    if (s->intra_vlc_format) {
880
        s->intra_ac_vlc_length=
881
        s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
882
    } else {
883
        s->intra_ac_vlc_length=
884
        s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
885
    }
886
    s->inter_ac_vlc_length=
887
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
888
}
889

    
890
static inline void encode_dc(MpegEncContext *s, int diff, int component)
891
{
892
  if(((unsigned) (diff+255)) >= 511){
893
        int index;
894

    
895
        if(diff<0){
896
            index= av_log2_16bit(-2*diff);
897
            diff--;
898
        }else{
899
            index= av_log2_16bit(2*diff);
900
        }
901
        if (component == 0) {
902
            put_bits(
903
                &s->pb,
904
                vlc_dc_lum_bits[index] + index,
905
                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
906
        }else{
907
            put_bits(
908
                &s->pb,
909
                vlc_dc_chroma_bits[index] + index,
910
                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
911
        }
912
  }else{
913
    if (component == 0) {
914
        put_bits(
915
            &s->pb,
916
            mpeg1_lum_dc_uni[diff+255]&0xFF,
917
            mpeg1_lum_dc_uni[diff+255]>>8);
918
    } else {
919
        put_bits(
920
            &s->pb,
921
            mpeg1_chr_dc_uni[diff+255]&0xFF,
922
            mpeg1_chr_dc_uni[diff+255]>>8);
923
    }
924
  }
925
}
926

    
927
static void mpeg1_encode_block(MpegEncContext *s,
928
                               DCTELEM *block,
929
                               int n)
930
{
931
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
932
    int code, component;
933
    const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
934

    
935
    last_index = s->block_last_index[n];
936

    
937
    /* DC coef */
938
    if (s->mb_intra) {
939
        component = (n <= 3 ? 0 : (n&1) + 1);
940
        dc = block[0]; /* overflow is impossible */
941
        diff = dc - s->last_dc[component];
942
        encode_dc(s, diff, component);
943
        s->last_dc[component] = dc;
944
        i = 1;
945
        if (s->intra_vlc_format)
946
            table_vlc = rl_mpeg2.table_vlc;
947
    } else {
948
        /* encode the first coefficient : needs to be done here because
949
           it is handled slightly differently */
950
        level = block[0];
951
        if (abs(level) == 1) {
952
                code = ((uint32_t)level >> 31); /* the sign bit */
953
                put_bits(&s->pb, 2, code | 0x02);
954
                i = 1;
955
        } else {
956
            i = 0;
957
            last_non_zero = -1;
958
            goto next_coef;
959
        }
960
    }
961

    
962
    /* now quantify & encode AC coefs */
963
    last_non_zero = i - 1;
964

    
965
    for(;i<=last_index;i++) {
966
        j = s->intra_scantable.permutated[i];
967
        level = block[j];
968
    next_coef:
969
#if 0
970
        if (level != 0)
971
            dprintf("level[%d]=%d\n", i, level);
972
#endif
973
        /* encode using VLC */
974
        if (level != 0) {
975
            run = i - last_non_zero - 1;
976

    
977
            alevel= level;
978
            MASK_ABS(sign, alevel)
979
            sign&=1;
980

    
981
            if (alevel <= mpeg1_max_level[0][run]){
982
                code= mpeg1_index_run[0][run] + alevel - 1;
983
                /* store the vlc & sign at once */
984
                put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
985
            } else {
986
                /* escape seems to be pretty rare <5% so i dont optimize it */
987
                put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
988
                /* escape: only clip in this case */
989
                put_bits(&s->pb, 6, run);
990
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
991
                    if (alevel < 128) {
992
                        put_bits(&s->pb, 8, level & 0xff);
993
                    } else {
994
                        if (level < 0) {
995
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
996
                        } else {
997
                            put_bits(&s->pb, 16, level & 0xffff);
998
                        }
999
                    }
1000
                }else{
1001
                    put_bits(&s->pb, 12, level & 0xfff);
1002
                }
1003
            }
1004
            last_non_zero = i;
1005
        }
1006
    }
1007
    /* end of block */
1008
    put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
1009
}
1010
#endif //CONFIG_ENCODERS
1011

    
1012
/******************************************/
1013
/* decoding */
1014

    
1015
static VLC dc_lum_vlc;
1016
static VLC dc_chroma_vlc;
1017
static VLC mv_vlc;
1018
static VLC mbincr_vlc;
1019
static VLC mb_ptype_vlc;
1020
static VLC mb_btype_vlc;
1021
static VLC mb_pat_vlc;
1022

    
1023
static void init_vlcs(void)
1024
{
1025
    static int done = 0;
1026

    
1027
    if (!done) {
1028
        done = 1;
1029

    
1030
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1031
                 vlc_dc_lum_bits, 1, 1,
1032
                 vlc_dc_lum_code, 2, 2, 1);
1033
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1034
                 vlc_dc_chroma_bits, 1, 1,
1035
                 vlc_dc_chroma_code, 2, 2, 1);
1036
        init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1037
                 &mbMotionVectorTable[0][1], 2, 1,
1038
                 &mbMotionVectorTable[0][0], 2, 1, 1);
1039
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1040
                 &mbAddrIncrTable[0][1], 2, 1,
1041
                 &mbAddrIncrTable[0][0], 2, 1, 1);
1042
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1043
                 &mbPatTable[0][1], 2, 1,
1044
                 &mbPatTable[0][0], 2, 1, 1);
1045

    
1046
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1047
                 &table_mb_ptype[0][1], 2, 1,
1048
                 &table_mb_ptype[0][0], 2, 1, 1);
1049
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1050
                 &table_mb_btype[0][1], 2, 1,
1051
                 &table_mb_btype[0][0], 2, 1, 1);
1052
        init_rl(&rl_mpeg1, 1);
1053
        init_rl(&rl_mpeg2, 1);
1054

    
1055
        init_2d_vlc_rl(&rl_mpeg1, 1);
1056
        init_2d_vlc_rl(&rl_mpeg2, 1);
1057
    }
1058
}
1059

    
1060
static inline int get_dmv(MpegEncContext *s)
1061
{
1062
    if(get_bits1(&s->gb))
1063
        return 1 - (get_bits1(&s->gb) << 1);
1064
    else
1065
        return 0;
1066
}
1067

    
1068
static inline int get_qscale(MpegEncContext *s)
1069
{
1070
    int qscale = get_bits(&s->gb, 5);
1071
    if (s->q_scale_type) {
1072
        return non_linear_qscale[qscale];
1073
    } else {
1074
        return qscale << 1;
1075
    }
1076
}
1077

    
1078
/* motion type (for mpeg2) */
1079
#define MT_FIELD 1
1080
#define MT_FRAME 2
1081
#define MT_16X8  2
1082
#define MT_DMV   3
1083

    
1084
static int mpeg_decode_mb(MpegEncContext *s,
1085
                          DCTELEM block[12][64])
1086
{
1087
    int i, j, k, cbp, val, mb_type, motion_type;
1088
    const int mb_block_count = 4 + (1<< s->chroma_format);
1089

    
1090
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1091

    
1092
    assert(s->mb_skipped==0);
1093

    
1094
    if (s->mb_skip_run-- != 0) {
1095
        if(s->pict_type == I_TYPE){
1096
            av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1097
            return -1;
1098
        }
1099

    
1100
        /* skip mb */
1101
        s->mb_intra = 0;
1102
        for(i=0;i<12;i++)
1103
            s->block_last_index[i] = -1;
1104
        if(s->picture_structure == PICT_FRAME)
1105
            s->mv_type = MV_TYPE_16X16;
1106
        else
1107
            s->mv_type = MV_TYPE_FIELD;
1108
        if (s->pict_type == P_TYPE) {
1109
            /* if P type, zero motion vector is implied */
1110
            s->mv_dir = MV_DIR_FORWARD;
1111
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1112
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1113
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1114
            s->field_select[0][0]= s->picture_structure - 1;
1115
            s->mb_skipped = 1;
1116
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1117
        } else {
1118
            int mb_type;
1119

    
1120
            if(s->mb_x)
1121
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1122
            else
1123
                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,
1124
            if(IS_INTRA(mb_type))
1125
                return -1;
1126

    
1127
            /* if B type, reuse previous vectors and directions */
1128
            s->mv[0][0][0] = s->last_mv[0][0][0];
1129
            s->mv[0][0][1] = s->last_mv[0][0][1];
1130
            s->mv[1][0][0] = s->last_mv[1][0][0];
1131
            s->mv[1][0][1] = s->last_mv[1][0][1];
1132

    
1133
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1134
                mb_type | MB_TYPE_SKIP;
1135
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1136

    
1137
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1138
                s->mb_skipped = 1;
1139
        }
1140

    
1141
        return 0;
1142
    }
1143

    
1144
    switch(s->pict_type) {
1145
    default:
1146
    case I_TYPE:
1147
        if (get_bits1(&s->gb) == 0) {
1148
            if (get_bits1(&s->gb) == 0){
1149
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1150
                return -1;
1151
            }
1152
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1153
        } else {
1154
            mb_type = MB_TYPE_INTRA;
1155
        }
1156
        break;
1157
    case P_TYPE:
1158
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1159
        if (mb_type < 0){
1160
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1161
            return -1;
1162
        }
1163
        mb_type = ptype2mb_type[ mb_type ];
1164
        break;
1165
    case B_TYPE:
1166
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1167
        if (mb_type < 0){
1168
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1169
            return -1;
1170
        }
1171
        mb_type = btype2mb_type[ mb_type ];
1172
        break;
1173
    }
1174
    dprintf("mb_type=%x\n", mb_type);
1175
//    motion_type = 0; /* avoid warning */
1176
    if (IS_INTRA(mb_type)) {
1177
        s->dsp.clear_blocks(s->block[0]);
1178

    
1179
        if(!s->chroma_y_shift){
1180
            s->dsp.clear_blocks(s->block[6]);
1181
        }
1182

    
1183
        /* compute dct type */
1184
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1185
            !s->frame_pred_frame_dct) {
1186
            s->interlaced_dct = get_bits1(&s->gb);
1187
        }
1188

    
1189
        if (IS_QUANT(mb_type))
1190
            s->qscale = get_qscale(s);
1191

    
1192
        if (s->concealment_motion_vectors) {
1193
            /* just parse them */
1194
            if (s->picture_structure != PICT_FRAME)
1195
                skip_bits1(&s->gb); /* field select */
1196

    
1197
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1198
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1199
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1200
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1201

    
1202
            skip_bits1(&s->gb); /* marker */
1203
        }else
1204
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1205
        s->mb_intra = 1;
1206
#ifdef HAVE_XVMC
1207
        //one 1 we memcpy blocks in xvmcvideo
1208
        if(s->avctx->xvmc_acceleration > 1){
1209
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1210
            if(s->swap_uv){
1211
                exchange_uv(s);
1212
            }
1213
        }
1214
#endif
1215

    
1216
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1217
            if(s->flags2 & CODEC_FLAG2_FAST){
1218
                for(i=0;i<6;i++) {
1219
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1220
                }
1221
            }else{
1222
                for(i=0;i<mb_block_count;i++) {
1223
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1224
                        return -1;
1225
                }
1226
            }
1227
        } else {
1228
            for(i=0;i<6;i++) {
1229
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1230
                    return -1;
1231
            }
1232
        }
1233
    } else {
1234
        if (mb_type & MB_TYPE_ZERO_MV){
1235
            assert(mb_type & MB_TYPE_CBP);
1236

    
1237
            /* compute dct type */
1238
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1239
                !s->frame_pred_frame_dct) {
1240
                s->interlaced_dct = get_bits1(&s->gb);
1241
            }
1242

    
1243
            if (IS_QUANT(mb_type))
1244
                s->qscale = get_qscale(s);
1245

    
1246
            s->mv_dir = MV_DIR_FORWARD;
1247
            if(s->picture_structure == PICT_FRAME)
1248
                s->mv_type = MV_TYPE_16X16;
1249
            else{
1250
                s->mv_type = MV_TYPE_FIELD;
1251
                mb_type |= MB_TYPE_INTERLACED;
1252
                s->field_select[0][0]= s->picture_structure - 1;
1253
            }
1254
            s->last_mv[0][0][0] = 0;
1255
            s->last_mv[0][0][1] = 0;
1256
            s->last_mv[0][1][0] = 0;
1257
            s->last_mv[0][1][1] = 0;
1258
            s->mv[0][0][0] = 0;
1259
            s->mv[0][0][1] = 0;
1260
        }else{
1261
            assert(mb_type & MB_TYPE_L0L1);
1262
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1263
            /* get additionnal motion vector type */
1264
            if (s->frame_pred_frame_dct)
1265
                motion_type = MT_FRAME;
1266
            else{
1267
                motion_type = get_bits(&s->gb, 2);
1268
            }
1269

    
1270
            /* compute dct type */
1271
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1272
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1273
                s->interlaced_dct = get_bits1(&s->gb);
1274
            }
1275

    
1276
            if (IS_QUANT(mb_type))
1277
                s->qscale = get_qscale(s);
1278

    
1279
            /* motion vectors */
1280
            s->mv_dir = 0;
1281
            for(i=0;i<2;i++) {
1282
                if (USES_LIST(mb_type, i)) {
1283
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1284
                    dprintf("motion_type=%d\n", motion_type);
1285
                    switch(motion_type) {
1286
                    case MT_FRAME: /* or MT_16X8 */
1287
                        if (s->picture_structure == PICT_FRAME) {
1288
                            /* MT_FRAME */
1289
                            mb_type |= MB_TYPE_16x16;
1290
                            s->mv_type = MV_TYPE_16X16;
1291
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1292
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1293
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1294
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1295
                            /* full_pel: only for mpeg1 */
1296
                            if (s->full_pel[i]){
1297
                                s->mv[i][0][0] <<= 1;
1298
                                s->mv[i][0][1] <<= 1;
1299
                            }
1300
                        } else {
1301
                            /* MT_16X8 */
1302
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1303
                            s->mv_type = MV_TYPE_16X8;
1304
                            for(j=0;j<2;j++) {
1305
                                s->field_select[i][j] = get_bits1(&s->gb);
1306
                                for(k=0;k<2;k++) {
1307
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1308
                                                             s->last_mv[i][j][k]);
1309
                                    s->last_mv[i][j][k] = val;
1310
                                    s->mv[i][j][k] = val;
1311
                                }
1312
                            }
1313
                        }
1314
                        break;
1315
                    case MT_FIELD:
1316
                        s->mv_type = MV_TYPE_FIELD;
1317
                        if (s->picture_structure == PICT_FRAME) {
1318
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1319
                            for(j=0;j<2;j++) {
1320
                                s->field_select[i][j] = get_bits1(&s->gb);
1321
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1322
                                                         s->last_mv[i][j][0]);
1323
                                s->last_mv[i][j][0] = val;
1324
                                s->mv[i][j][0] = val;
1325
                                dprintf("fmx=%d\n", val);
1326
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1327
                                                         s->last_mv[i][j][1] >> 1);
1328
                                s->last_mv[i][j][1] = val << 1;
1329
                                s->mv[i][j][1] = val;
1330
                                dprintf("fmy=%d\n", val);
1331
                            }
1332
                        } else {
1333
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1334
                            s->field_select[i][0] = get_bits1(&s->gb);
1335
                            for(k=0;k<2;k++) {
1336
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1337
                                                         s->last_mv[i][0][k]);
1338
                                s->last_mv[i][0][k] = val;
1339
                                s->last_mv[i][1][k] = val;
1340
                                s->mv[i][0][k] = val;
1341
                            }
1342
                        }
1343
                        break;
1344
                    case MT_DMV:
1345
                        {
1346
                            int dmx, dmy, mx, my, m;
1347

    
1348
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1349
                                                    s->last_mv[i][0][0]);
1350
                            s->last_mv[i][0][0] = mx;
1351
                            s->last_mv[i][1][0] = mx;
1352
                            dmx = get_dmv(s);
1353
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1354
                                                    s->last_mv[i][0][1] >> 1);
1355
                            dmy = get_dmv(s);
1356
                            s->mv_type = MV_TYPE_DMV;
1357

    
1358

    
1359
                            s->last_mv[i][0][1] = my<<1;
1360
                            s->last_mv[i][1][1] = my<<1;
1361

    
1362
                            s->mv[i][0][0] = mx;
1363
                            s->mv[i][0][1] = my;
1364
                            s->mv[i][1][0] = mx;//not used
1365
                            s->mv[i][1][1] = my;//not used
1366

    
1367
                            if (s->picture_structure == PICT_FRAME) {
1368
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1369

    
1370
                                //m = 1 + 2 * s->top_field_first;
1371
                                m = s->top_field_first ? 1 : 3;
1372

    
1373
                                /* top -> top pred */
1374
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1375
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1376
                                m = 4 - m;
1377
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1378
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1379
                            } else {
1380
                                mb_type |= MB_TYPE_16x16;
1381

    
1382
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1383
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1384
                                if(s->picture_structure == PICT_TOP_FIELD)
1385
                                    s->mv[i][2][1]--;
1386
                                else
1387
                                    s->mv[i][2][1]++;
1388
                            }
1389
                        }
1390
                        break;
1391
                    default:
1392
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1393
                        return -1;
1394
                    }
1395
                }
1396
            }
1397
        }
1398

    
1399
        s->mb_intra = 0;
1400
        if (HAS_CBP(mb_type)) {
1401
            s->dsp.clear_blocks(s->block[0]);
1402

    
1403
            if(!s->chroma_y_shift){
1404
                s->dsp.clear_blocks(s->block[6]);
1405
            }
1406

    
1407
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1408
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1409
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1410
                return -1;
1411
            }
1412
            if(mb_block_count > 6){
1413
                 cbp<<= mb_block_count-6;
1414
                 cbp |= get_bits(&s->gb, mb_block_count-6);
1415
            }
1416

    
1417
#ifdef HAVE_XVMC
1418
            //on 1 we memcpy blocks in xvmcvideo
1419
            if(s->avctx->xvmc_acceleration > 1){
1420
                XVMC_pack_pblocks(s,cbp);
1421
                if(s->swap_uv){
1422
                    exchange_uv(s);
1423
                }
1424
            }
1425
#endif
1426

    
1427
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1428
                if(s->flags2 & CODEC_FLAG2_FAST){
1429
                    for(i=0;i<6;i++) {
1430
                        if(cbp & 32) {
1431
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1432
                        } else {
1433
                            s->block_last_index[i] = -1;
1434
                        }
1435
                        cbp+=cbp;
1436
                    }
1437
                }else{
1438
                    cbp<<= 12-mb_block_count;
1439

    
1440
                    for(i=0;i<mb_block_count;i++) {
1441
                        if ( cbp & (1<<11) ) {
1442
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1443
                                return -1;
1444
                        } else {
1445
                            s->block_last_index[i] = -1;
1446
                        }
1447
                        cbp+=cbp;
1448
                    }
1449
                }
1450
            } else {
1451
                if(s->flags2 & CODEC_FLAG2_FAST){
1452
                    for(i=0;i<6;i++) {
1453
                        if (cbp & 32) {
1454
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1455
                        } else {
1456
                            s->block_last_index[i] = -1;
1457
                        }
1458
                        cbp+=cbp;
1459
                    }
1460
                }else{
1461
                    for(i=0;i<6;i++) {
1462
                        if (cbp & 32) {
1463
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1464
                                return -1;
1465
                        } else {
1466
                            s->block_last_index[i] = -1;
1467
                        }
1468
                        cbp+=cbp;
1469
                    }
1470
                }
1471
            }
1472
        }else{
1473
            for(i=0;i<12;i++)
1474
                s->block_last_index[i] = -1;
1475
        }
1476
    }
1477

    
1478
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1479

    
1480
    return 0;
1481
}
1482

    
1483
/* as h263, but only 17 codes */
1484
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1485
{
1486
    int code, sign, val, l, shift;
1487

    
1488
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1489
    if (code == 0) {
1490
        return pred;
1491
    }
1492
    if (code < 0) {
1493
        return 0xffff;
1494
    }
1495

    
1496
    sign = get_bits1(&s->gb);
1497
    shift = fcode - 1;
1498
    val = code;
1499
    if (shift) {
1500
        val = (val - 1) << shift;
1501
        val |= get_bits(&s->gb, shift);
1502
        val++;
1503
    }
1504
    if (sign)
1505
        val = -val;
1506
    val += pred;
1507

    
1508
    /* modulo decoding */
1509
    l= INT_BIT - 5 - shift;
1510
    val = (val<<l)>>l;
1511
    return val;
1512
}
1513

    
1514
static inline int decode_dc(GetBitContext *gb, int component)
1515
{
1516
    int code, diff;
1517

    
1518
    if (component == 0) {
1519
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1520
    } else {
1521
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1522
    }
1523
    if (code < 0){
1524
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1525
        return 0xffff;
1526
    }
1527
    if (code == 0) {
1528
        diff = 0;
1529
    } else {
1530
        diff = get_xbits(gb, code);
1531
    }
1532
    return diff;
1533
}
1534

    
1535
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1536
                               DCTELEM *block,
1537
                               int n)
1538
{
1539
    int level, dc, diff, i, j, run;
1540
    int component;
1541
    RLTable *rl = &rl_mpeg1;
1542
    uint8_t * const scantable= s->intra_scantable.permutated;
1543
    const uint16_t *quant_matrix= s->intra_matrix;
1544
    const int qscale= s->qscale;
1545

    
1546
    /* DC coef */
1547
    component = (n <= 3 ? 0 : n - 4 + 1);
1548
    diff = decode_dc(&s->gb, component);
1549
    if (diff >= 0xffff)
1550
        return -1;
1551
    dc = s->last_dc[component];
1552
    dc += diff;
1553
    s->last_dc[component] = dc;
1554
    block[0] = dc<<3;
1555
    dprintf("dc=%d diff=%d\n", dc, diff);
1556
    i = 0;
1557
    {
1558
        OPEN_READER(re, &s->gb);
1559
        /* now quantify & encode AC coefs */
1560
        for(;;) {
1561
            UPDATE_CACHE(re, &s->gb);
1562
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1563

    
1564
            if(level == 127){
1565
                break;
1566
            } else if(level != 0) {
1567
                i += run;
1568
                j = scantable[i];
1569
                level= (level*qscale*quant_matrix[j])>>4;
1570
                level= (level-1)|1;
1571
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1572
                LAST_SKIP_BITS(re, &s->gb, 1);
1573
            } else {
1574
                /* escape */
1575
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1576
                UPDATE_CACHE(re, &s->gb);
1577
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1578
                if (level == -128) {
1579
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1580
                } else if (level == 0) {
1581
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1582
                }
1583
                i += run;
1584
                j = scantable[i];
1585
                if(level<0){
1586
                    level= -level;
1587
                    level= (level*qscale*quant_matrix[j])>>4;
1588
                    level= (level-1)|1;
1589
                    level= -level;
1590
                }else{
1591
                    level= (level*qscale*quant_matrix[j])>>4;
1592
                    level= (level-1)|1;
1593
                }
1594
            }
1595
            if (i > 63){
1596
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1597
                return -1;
1598
            }
1599

    
1600
            block[j] = level;
1601
        }
1602
        CLOSE_READER(re, &s->gb);
1603
    }
1604
    s->block_last_index[n] = i;
1605
   return 0;
1606
}
1607

    
1608
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1609
                               DCTELEM *block,
1610
                               int n)
1611
{
1612
    int level, i, j, run;
1613
    RLTable *rl = &rl_mpeg1;
1614
    uint8_t * const scantable= s->intra_scantable.permutated;
1615
    const uint16_t *quant_matrix= s->inter_matrix;
1616
    const int qscale= s->qscale;
1617

    
1618
    {
1619
        OPEN_READER(re, &s->gb);
1620
        i = -1;
1621
        /* special case for the first coef. no need to add a second vlc table */
1622
        UPDATE_CACHE(re, &s->gb);
1623
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1624
            level= (3*qscale*quant_matrix[0])>>5;
1625
            level= (level-1)|1;
1626
            if(GET_CACHE(re, &s->gb)&0x40000000)
1627
                level= -level;
1628
            block[0] = level;
1629
            i++;
1630
            SKIP_BITS(re, &s->gb, 2);
1631
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1632
                goto end;
1633
        }
1634

    
1635
        /* now quantify & encode AC coefs */
1636
        for(;;) {
1637
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1638

    
1639
            if(level != 0) {
1640
                i += run;
1641
                j = scantable[i];
1642
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1643
                level= (level-1)|1;
1644
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1645
                SKIP_BITS(re, &s->gb, 1);
1646
            } else {
1647
                /* escape */
1648
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1649
                UPDATE_CACHE(re, &s->gb);
1650
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1651
                if (level == -128) {
1652
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1653
                } else if (level == 0) {
1654
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1655
                }
1656
                i += run;
1657
                j = scantable[i];
1658
                if(level<0){
1659
                    level= -level;
1660
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1661
                    level= (level-1)|1;
1662
                    level= -level;
1663
                }else{
1664
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1665
                    level= (level-1)|1;
1666
                }
1667
            }
1668
            if (i > 63){
1669
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1670
                return -1;
1671
            }
1672

    
1673
            block[j] = level;
1674
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1675
                break;
1676
            UPDATE_CACHE(re, &s->gb);
1677
        }
1678
end:
1679
        LAST_SKIP_BITS(re, &s->gb, 2);
1680
        CLOSE_READER(re, &s->gb);
1681
    }
1682
    s->block_last_index[n] = i;
1683
    return 0;
1684
}
1685

    
1686
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1687
{
1688
    int level, i, j, run;
1689
    RLTable *rl = &rl_mpeg1;
1690
    uint8_t * const scantable= s->intra_scantable.permutated;
1691
    const int qscale= s->qscale;
1692

    
1693
    {
1694
        OPEN_READER(re, &s->gb);
1695
        i = -1;
1696
        /* special case for the first coef. no need to add a second vlc table */
1697
        UPDATE_CACHE(re, &s->gb);
1698
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1699
            level= (3*qscale)>>1;
1700
            level= (level-1)|1;
1701
            if(GET_CACHE(re, &s->gb)&0x40000000)
1702
                level= -level;
1703
            block[0] = level;
1704
            i++;
1705
            SKIP_BITS(re, &s->gb, 2);
1706
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1707
                goto end;
1708
        }
1709

    
1710
        /* now quantify & encode AC coefs */
1711
        for(;;) {
1712
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1713

    
1714
            if(level != 0) {
1715
                i += run;
1716
                j = scantable[i];
1717
                level= ((level*2+1)*qscale)>>1;
1718
                level= (level-1)|1;
1719
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1720
                SKIP_BITS(re, &s->gb, 1);
1721
            } else {
1722
                /* escape */
1723
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1724
                UPDATE_CACHE(re, &s->gb);
1725
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1726
                if (level == -128) {
1727
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1728
                } else if (level == 0) {
1729
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1730
                }
1731
                i += run;
1732
                j = scantable[i];
1733
                if(level<0){
1734
                    level= -level;
1735
                    level= ((level*2+1)*qscale)>>1;
1736
                    level= (level-1)|1;
1737
                    level= -level;
1738
                }else{
1739
                    level= ((level*2+1)*qscale)>>1;
1740
                    level= (level-1)|1;
1741
                }
1742
            }
1743

    
1744
            block[j] = level;
1745
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1746
                break;
1747
            UPDATE_CACHE(re, &s->gb);
1748
        }
1749
end:
1750
        LAST_SKIP_BITS(re, &s->gb, 2);
1751
        CLOSE_READER(re, &s->gb);
1752
    }
1753
    s->block_last_index[n] = i;
1754
    return 0;
1755
}
1756

    
1757

    
1758
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1759
                               DCTELEM *block,
1760
                               int n)
1761
{
1762
    int level, i, j, run;
1763
    RLTable *rl = &rl_mpeg1;
1764
    uint8_t * const scantable= s->intra_scantable.permutated;
1765
    const uint16_t *quant_matrix;
1766
    const int qscale= s->qscale;
1767
    int mismatch;
1768

    
1769
    mismatch = 1;
1770

    
1771
    {
1772
        OPEN_READER(re, &s->gb);
1773
        i = -1;
1774
        if (n < 4)
1775
            quant_matrix = s->inter_matrix;
1776
        else
1777
            quant_matrix = s->chroma_inter_matrix;
1778

    
1779
        /* special case for the first coef. no need to add a second vlc table */
1780
        UPDATE_CACHE(re, &s->gb);
1781
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1782
            level= (3*qscale*quant_matrix[0])>>5;
1783
            if(GET_CACHE(re, &s->gb)&0x40000000)
1784
                level= -level;
1785
            block[0] = level;
1786
            mismatch ^= level;
1787
            i++;
1788
            SKIP_BITS(re, &s->gb, 2);
1789
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1790
                goto end;
1791
        }
1792

    
1793
        /* now quantify & encode AC coefs */
1794
        for(;;) {
1795
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1796

    
1797
            if(level != 0) {
1798
                i += run;
1799
                j = scantable[i];
1800
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1801
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1802
                SKIP_BITS(re, &s->gb, 1);
1803
            } else {
1804
                /* escape */
1805
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1806
                UPDATE_CACHE(re, &s->gb);
1807
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1808

    
1809
                i += run;
1810
                j = scantable[i];
1811
                if(level<0){
1812
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1813
                    level= -level;
1814
                }else{
1815
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1816
                }
1817
            }
1818
            if (i > 63){
1819
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1820
                return -1;
1821
            }
1822

    
1823
            mismatch ^= level;
1824
            block[j] = level;
1825
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1826
                break;
1827
            UPDATE_CACHE(re, &s->gb);
1828
        }
1829
end:
1830
        LAST_SKIP_BITS(re, &s->gb, 2);
1831
        CLOSE_READER(re, &s->gb);
1832
    }
1833
    block[63] ^= (mismatch & 1);
1834

    
1835
    s->block_last_index[n] = i;
1836
    return 0;
1837
}
1838

    
1839
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1840
                               DCTELEM *block,
1841
                               int n)
1842
{
1843
    int level, i, j, run;
1844
    RLTable *rl = &rl_mpeg1;
1845
    uint8_t * const scantable= s->intra_scantable.permutated;
1846
    const int qscale= s->qscale;
1847
    OPEN_READER(re, &s->gb);
1848
    i = -1;
1849

    
1850
    /* special case for the first coef. no need to add a second vlc table */
1851
    UPDATE_CACHE(re, &s->gb);
1852
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1853
        level= (3*qscale)>>1;
1854
        if(GET_CACHE(re, &s->gb)&0x40000000)
1855
            level= -level;
1856
        block[0] = level;
1857
        i++;
1858
        SKIP_BITS(re, &s->gb, 2);
1859
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1860
            goto end;
1861
    }
1862

    
1863
    /* now quantify & encode AC coefs */
1864
    for(;;) {
1865
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1866

    
1867
        if(level != 0) {
1868
            i += run;
1869
            j = scantable[i];
1870
            level= ((level*2+1)*qscale)>>1;
1871
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1872
            SKIP_BITS(re, &s->gb, 1);
1873
        } else {
1874
            /* escape */
1875
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1876
            UPDATE_CACHE(re, &s->gb);
1877
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1878

    
1879
            i += run;
1880
            j = scantable[i];
1881
            if(level<0){
1882
                level= ((-level*2+1)*qscale)>>1;
1883
                level= -level;
1884
            }else{
1885
                level= ((level*2+1)*qscale)>>1;
1886
            }
1887
        }
1888

    
1889
        block[j] = level;
1890
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1891
            break;
1892
        UPDATE_CACHE(re, &s->gb);
1893
    }
1894
end:
1895
    LAST_SKIP_BITS(re, &s->gb, 2);
1896
    CLOSE_READER(re, &s->gb);
1897
    s->block_last_index[n] = i;
1898
    return 0;
1899
}
1900

    
1901

    
1902
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1903
                               DCTELEM *block,
1904
                               int n)
1905
{
1906
    int level, dc, diff, i, j, run;
1907
    int component;
1908
    RLTable *rl;
1909
    uint8_t * const scantable= s->intra_scantable.permutated;
1910
    const uint16_t *quant_matrix;
1911
    const int qscale= s->qscale;
1912
    int mismatch;
1913

    
1914
    /* DC coef */
1915
    if (n < 4){
1916
        quant_matrix = s->intra_matrix;
1917
        component = 0;
1918
    }else{
1919
        quant_matrix = s->chroma_intra_matrix;
1920
        component = (n&1) + 1;
1921
    }
1922
    diff = decode_dc(&s->gb, component);
1923
    if (diff >= 0xffff)
1924
        return -1;
1925
    dc = s->last_dc[component];
1926
    dc += diff;
1927
    s->last_dc[component] = dc;
1928
    block[0] = dc << (3 - s->intra_dc_precision);
1929
    dprintf("dc=%d\n", block[0]);
1930
    mismatch = block[0] ^ 1;
1931
    i = 0;
1932
    if (s->intra_vlc_format)
1933
        rl = &rl_mpeg2;
1934
    else
1935
        rl = &rl_mpeg1;
1936

    
1937
    {
1938
        OPEN_READER(re, &s->gb);
1939
        /* now quantify & encode AC coefs */
1940
        for(;;) {
1941
            UPDATE_CACHE(re, &s->gb);
1942
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1943

    
1944
            if(level == 127){
1945
                break;
1946
            } else if(level != 0) {
1947
                i += run;
1948
                j = scantable[i];
1949
                level= (level*qscale*quant_matrix[j])>>4;
1950
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1951
                LAST_SKIP_BITS(re, &s->gb, 1);
1952
            } else {
1953
                /* escape */
1954
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1955
                UPDATE_CACHE(re, &s->gb);
1956
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1957
                i += run;
1958
                j = scantable[i];
1959
                if(level<0){
1960
                    level= (-level*qscale*quant_matrix[j])>>4;
1961
                    level= -level;
1962
                }else{
1963
                    level= (level*qscale*quant_matrix[j])>>4;
1964
                }
1965
            }
1966
            if (i > 63){
1967
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1968
                return -1;
1969
            }
1970

    
1971
            mismatch^= level;
1972
            block[j] = level;
1973
        }
1974
        CLOSE_READER(re, &s->gb);
1975
    }
1976
    block[63]^= mismatch&1;
1977

    
1978
    s->block_last_index[n] = i;
1979
    return 0;
1980
}
1981

    
1982
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1983
                               DCTELEM *block,
1984
                               int n)
1985
{
1986
    int level, dc, diff, j, run;
1987
    int component;
1988
    RLTable *rl;
1989
    uint8_t * scantable= s->intra_scantable.permutated;
1990
    const uint16_t *quant_matrix;
1991
    const int qscale= s->qscale;
1992

    
1993
    /* DC coef */
1994
    if (n < 4){
1995
        quant_matrix = s->intra_matrix;
1996
        component = 0;
1997
    }else{
1998
        quant_matrix = s->chroma_intra_matrix;
1999
        component = (n&1) + 1;
2000
    }
2001
    diff = decode_dc(&s->gb, component);
2002
    if (diff >= 0xffff)
2003
        return -1;
2004
    dc = s->last_dc[component];
2005
    dc += diff;
2006
    s->last_dc[component] = dc;
2007
    block[0] = dc << (3 - s->intra_dc_precision);
2008
    if (s->intra_vlc_format)
2009
        rl = &rl_mpeg2;
2010
    else
2011
        rl = &rl_mpeg1;
2012

    
2013
    {
2014
        OPEN_READER(re, &s->gb);
2015
        /* now quantify & encode AC coefs */
2016
        for(;;) {
2017
            UPDATE_CACHE(re, &s->gb);
2018
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2019

    
2020
            if(level == 127){
2021
                break;
2022
            } else if(level != 0) {
2023
                scantable += run;
2024
                j = *scantable;
2025
                level= (level*qscale*quant_matrix[j])>>4;
2026
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2027
                LAST_SKIP_BITS(re, &s->gb, 1);
2028
            } else {
2029
                /* escape */
2030
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2031
                UPDATE_CACHE(re, &s->gb);
2032
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2033
                scantable += run;
2034
                j = *scantable;
2035
                if(level<0){
2036
                    level= (-level*qscale*quant_matrix[j])>>4;
2037
                    level= -level;
2038
                }else{
2039
                    level= (level*qscale*quant_matrix[j])>>4;
2040
                }
2041
            }
2042

    
2043
            block[j] = level;
2044
        }
2045
        CLOSE_READER(re, &s->gb);
2046
    }
2047

    
2048
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2049
    return 0;
2050
}
2051

    
2052
typedef struct Mpeg1Context {
2053
    MpegEncContext mpeg_enc_ctx;
2054
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2055
    int repeat_field; /* true if we must repeat the field */
2056
    AVPanScan pan_scan; /** some temporary storage for the panscan */
2057
    int slice_count;
2058
    int swap_uv;//indicate VCR2
2059
    int save_aspect_info;
2060
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2061

    
2062
} Mpeg1Context;
2063

    
2064
static int mpeg_decode_init(AVCodecContext *avctx)
2065
{
2066
    Mpeg1Context *s = avctx->priv_data;
2067
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2068
    int i;
2069

    
2070
    //we need some parmutation to store
2071
    //matrixes, until MPV_common_init()
2072
    //set the real permutatuon
2073
    for(i=0;i<64;i++)
2074
       s2->dsp.idct_permutation[i]=i;
2075

    
2076
    MPV_decode_defaults(s2);
2077

    
2078
    s->mpeg_enc_ctx.avctx= avctx;
2079
    s->mpeg_enc_ctx.flags= avctx->flags;
2080
    s->mpeg_enc_ctx.flags2= avctx->flags2;
2081
    common_init(&s->mpeg_enc_ctx);
2082
    init_vlcs();
2083

    
2084
    s->mpeg_enc_ctx_allocated = 0;
2085
    s->mpeg_enc_ctx.picture_number = 0;
2086
    s->repeat_field = 0;
2087
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2088
    return 0;
2089
}
2090

    
2091
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2092
                                     const uint8_t *new_perm){
2093
    uint16_t temp_matrix[64];
2094
    int i;
2095

    
2096
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2097

    
2098
    for(i=0;i<64;i++){
2099
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2100
    }
2101
}
2102

    
2103
//Call this function when we know all parameters
2104
//it may be called in different places for mpeg1 and mpeg2
2105
static int mpeg_decode_postinit(AVCodecContext *avctx){
2106
    Mpeg1Context *s1 = avctx->priv_data;
2107
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2108
    uint8_t old_permutation[64];
2109

    
2110
    if (
2111
        (s1->mpeg_enc_ctx_allocated == 0)||
2112
        avctx->coded_width  != s->width ||
2113
        avctx->coded_height != s->height||
2114
        s1->save_aspect_info != s->aspect_ratio_info||
2115
        0)
2116
    {
2117

    
2118
        if (s1->mpeg_enc_ctx_allocated) {
2119
            ParseContext pc= s->parse_context;
2120
            s->parse_context.buffer=0;
2121
            MPV_common_end(s);
2122
            s->parse_context= pc;
2123
        }
2124

    
2125
        if( (s->width == 0 )||(s->height == 0))
2126
            return -2;
2127

    
2128
        avcodec_set_dimensions(avctx, s->width, s->height);
2129
        avctx->bit_rate = s->bit_rate;
2130
        s1->save_aspect_info = s->aspect_ratio_info;
2131

    
2132
     //low_delay may be forced, in this case we will have B frames
2133
     //that behave like P frames
2134
        avctx->has_b_frames = !(s->low_delay);
2135

    
2136
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2137
            //mpeg1 fps
2138
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2139
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2140
            //mpeg1 aspect
2141
            avctx->sample_aspect_ratio= av_d2q(
2142
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2143

    
2144
        }else{//mpeg2
2145
        //mpeg2 fps
2146
            av_reduce(
2147
                &s->avctx->time_base.den,
2148
                &s->avctx->time_base.num,
2149
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2150
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2151
                1<<30);
2152
        //mpeg2 aspect
2153
            if(s->aspect_ratio_info > 1){
2154
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2155
                    s->avctx->sample_aspect_ratio=
2156
                        av_div_q(
2157
                         mpeg2_aspect[s->aspect_ratio_info],
2158
                         (AVRational){s->width, s->height}
2159
                         );
2160
                }else{
2161
                    s->avctx->sample_aspect_ratio=
2162
                        av_div_q(
2163
                         mpeg2_aspect[s->aspect_ratio_info],
2164
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2165
                        );
2166
                }
2167
            }else{
2168
                s->avctx->sample_aspect_ratio=
2169
                    mpeg2_aspect[s->aspect_ratio_info];
2170
            }
2171
        }//mpeg2
2172

    
2173
        if(avctx->xvmc_acceleration){
2174
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2175
        }else{
2176
            if(s->chroma_format <  2){
2177
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2178
            }else
2179
            if(s->chroma_format == 2){
2180
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2181
            }else
2182
            if(s->chroma_format >  2){
2183
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2184
            }
2185
        }
2186
        //until then pix_fmt may be changed right after codec init
2187
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2188
            if( avctx->idct_algo == FF_IDCT_AUTO )
2189
                avctx->idct_algo = FF_IDCT_SIMPLE;
2190

    
2191
        //quantization matrixes may need reordering
2192
        //if dct permutation is changed
2193
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2194

    
2195
        if (MPV_common_init(s) < 0)
2196
            return -2;
2197

    
2198
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2199
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2200
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2201
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2202

    
2203
        s1->mpeg_enc_ctx_allocated = 1;
2204
    }
2205
    return 0;
2206
}
2207

    
2208
static int mpeg1_decode_picture(AVCodecContext *avctx,
2209
                                const uint8_t *buf, int buf_size)
2210
{
2211
    Mpeg1Context *s1 = avctx->priv_data;
2212
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2213
    int ref, f_code, vbv_delay;
2214

    
2215
    if(mpeg_decode_postinit(s->avctx) < 0)
2216
       return -2;
2217

    
2218
    init_get_bits(&s->gb, buf, buf_size*8);
2219

    
2220
    ref = get_bits(&s->gb, 10); /* temporal ref */
2221
    s->pict_type = get_bits(&s->gb, 3);
2222
    if(s->pict_type == 0 || s->pict_type > 3)
2223
        return -1;
2224

    
2225
    vbv_delay= get_bits(&s->gb, 16);
2226
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2227
        s->full_pel[0] = get_bits1(&s->gb);
2228
        f_code = get_bits(&s->gb, 3);
2229
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2230
            return -1;
2231
        s->mpeg_f_code[0][0] = f_code;
2232
        s->mpeg_f_code[0][1] = f_code;
2233
    }
2234
    if (s->pict_type == B_TYPE) {
2235
        s->full_pel[1] = get_bits1(&s->gb);
2236
        f_code = get_bits(&s->gb, 3);
2237
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2238
            return -1;
2239
        s->mpeg_f_code[1][0] = f_code;
2240
        s->mpeg_f_code[1][1] = f_code;
2241
    }
2242
    s->current_picture.pict_type= s->pict_type;
2243
    s->current_picture.key_frame= s->pict_type == I_TYPE;
2244

    
2245
    if(avctx->debug & FF_DEBUG_PICT_INFO)
2246
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2247

    
2248
    s->y_dc_scale = 8;
2249
    s->c_dc_scale = 8;
2250
    s->first_slice = 1;
2251
    return 0;
2252
}
2253

    
2254
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2255
{
2256
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2257
    int horiz_size_ext, vert_size_ext;
2258
    int bit_rate_ext;
2259

    
2260
    skip_bits(&s->gb, 1); /* profil and level esc*/
2261
    s->avctx->profile= get_bits(&s->gb, 3);
2262
    s->avctx->level= get_bits(&s->gb, 4);
2263
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2264
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2265
    horiz_size_ext = get_bits(&s->gb, 2);
2266
    vert_size_ext = get_bits(&s->gb, 2);
2267
    s->width |= (horiz_size_ext << 12);
2268
    s->height |= (vert_size_ext << 12);
2269
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2270
    s->bit_rate += (bit_rate_ext << 18) * 400;
2271
    skip_bits1(&s->gb); /* marker */
2272
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2273

    
2274
    s->low_delay = get_bits1(&s->gb);
2275
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2276

    
2277
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2278
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2279

    
2280
    dprintf("sequence extension\n");
2281
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2282
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
2283

    
2284
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2285
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2286
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2287

    
2288
}
2289

    
2290
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2291
{
2292
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2293
    int color_description, w, h;
2294

    
2295
    skip_bits(&s->gb, 3); /* video format */
2296
    color_description= get_bits1(&s->gb);
2297
    if(color_description){
2298
        skip_bits(&s->gb, 8); /* color primaries */
2299
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2300
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2301
    }
2302
    w= get_bits(&s->gb, 14);
2303
    skip_bits(&s->gb, 1); //marker
2304
    h= get_bits(&s->gb, 14);
2305
    skip_bits(&s->gb, 1); //marker
2306

    
2307
    s1->pan_scan.width= 16*w;
2308
    s1->pan_scan.height=16*h;
2309

    
2310
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2311
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2312
}
2313

    
2314
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2315
{
2316
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2317
    int i,nofco;
2318

    
2319
    nofco = 1;
2320
    if(s->progressive_sequence){
2321
        if(s->repeat_first_field){
2322
            nofco++;
2323
            if(s->top_field_first)
2324
                nofco++;
2325
        }
2326
    }else{
2327
        if(s->picture_structure == PICT_FRAME){
2328
            nofco++;
2329
            if(s->repeat_first_field)
2330
                nofco++;
2331
        }
2332
    }
2333
    for(i=0; i<nofco; i++){
2334
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2335
        skip_bits(&s->gb, 1); //marker
2336
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2337
        skip_bits(&s->gb, 1); //marker
2338
    }
2339

    
2340
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2341
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2342
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2343
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2344
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2345
        );
2346
}
2347

    
2348
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2349
{
2350
    int i, v, j;
2351

    
2352
    dprintf("matrix extension\n");
2353

    
2354
    if (get_bits1(&s->gb)) {
2355
        for(i=0;i<64;i++) {
2356
            v = get_bits(&s->gb, 8);
2357
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2358
            s->intra_matrix[j] = v;
2359
            s->chroma_intra_matrix[j] = v;
2360
        }
2361
    }
2362
    if (get_bits1(&s->gb)) {
2363
        for(i=0;i<64;i++) {
2364
            v = get_bits(&s->gb, 8);
2365
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2366
            s->inter_matrix[j] = v;
2367
            s->chroma_inter_matrix[j] = v;
2368
        }
2369
    }
2370
    if (get_bits1(&s->gb)) {
2371
        for(i=0;i<64;i++) {
2372
            v = get_bits(&s->gb, 8);
2373
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2374
            s->chroma_intra_matrix[j] = v;
2375
        }
2376
    }
2377
    if (get_bits1(&s->gb)) {
2378
        for(i=0;i<64;i++) {
2379
            v = get_bits(&s->gb, 8);
2380
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2381
            s->chroma_inter_matrix[j] = v;
2382
        }
2383
    }
2384
}
2385

    
2386
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2387
{
2388
    s->full_pel[0] = s->full_pel[1] = 0;
2389
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2390
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2391
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2392
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2393
    s->intra_dc_precision = get_bits(&s->gb, 2);
2394
    s->picture_structure = get_bits(&s->gb, 2);
2395
    s->top_field_first = get_bits1(&s->gb);
2396
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2397
    s->concealment_motion_vectors = get_bits1(&s->gb);
2398
    s->q_scale_type = get_bits1(&s->gb);
2399
    s->intra_vlc_format = get_bits1(&s->gb);
2400
    s->alternate_scan = get_bits1(&s->gb);
2401
    s->repeat_first_field = get_bits1(&s->gb);
2402
    s->chroma_420_type = get_bits1(&s->gb);
2403
    s->progressive_frame = get_bits1(&s->gb);
2404

    
2405
    if(s->picture_structure == PICT_FRAME){
2406
        s->first_field=0;
2407
        s->v_edge_pos= 16*s->mb_height;
2408
    }else{
2409
        s->first_field ^= 1;
2410
        s->v_edge_pos=  8*s->mb_height;
2411
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2412
    }
2413

    
2414
    if(s->alternate_scan){
2415
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2416
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2417
    }else{
2418
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2419
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2420
    }
2421

    
2422
    /* composite display not parsed */
2423
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2424
    dprintf("picture_structure=%d\n", s->picture_structure);
2425
    dprintf("top field first=%d\n", s->top_field_first);
2426
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2427
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2428
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2429
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2430
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2431
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2432
}
2433

    
2434
static void mpeg_decode_extension(AVCodecContext *avctx,
2435
                                  const uint8_t *buf, int buf_size)
2436
{
2437
    Mpeg1Context *s1 = avctx->priv_data;
2438
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2439
    int ext_type;
2440

    
2441
    init_get_bits(&s->gb, buf, buf_size*8);
2442

    
2443
    ext_type = get_bits(&s->gb, 4);
2444
    switch(ext_type) {
2445
    case 0x1:
2446
        mpeg_decode_sequence_extension(s1);
2447
        break;
2448
    case 0x2:
2449
        mpeg_decode_sequence_display_extension(s1);
2450
        break;
2451
    case 0x3:
2452
        mpeg_decode_quant_matrix_extension(s);
2453
        break;
2454
    case 0x7:
2455
        mpeg_decode_picture_display_extension(s1);
2456
        break;
2457
    case 0x8:
2458
        mpeg_decode_picture_coding_extension(s);
2459
        break;
2460
    }
2461
}
2462

    
2463
static void exchange_uv(MpegEncContext *s){
2464
    short * tmp = s->pblocks[4];
2465
    s->pblocks[4] = s->pblocks[5];
2466
    s->pblocks[5] = tmp;
2467
}
2468

    
2469
static int mpeg_field_start(MpegEncContext *s){
2470
    AVCodecContext *avctx= s->avctx;
2471
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2472

    
2473
    /* start frame decoding */
2474
    if(s->first_field || s->picture_structure==PICT_FRAME){
2475
        if(MPV_frame_start(s, avctx) < 0)
2476
            return -1;
2477

    
2478
        ff_er_frame_start(s);
2479

    
2480
        /* first check if we must repeat the frame */
2481
        s->current_picture_ptr->repeat_pict = 0;
2482
        if (s->repeat_first_field) {
2483
            if (s->progressive_sequence) {
2484
                if (s->top_field_first)
2485
                    s->current_picture_ptr->repeat_pict = 4;
2486
                else
2487
                    s->current_picture_ptr->repeat_pict = 2;
2488
            } else if (s->progressive_frame) {
2489
                s->current_picture_ptr->repeat_pict = 1;
2490
            }
2491
        }
2492

    
2493
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2494
    }else{ //second field
2495
            int i;
2496

    
2497
            if(!s->current_picture_ptr){
2498
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2499
                return -1;
2500
            }
2501

    
2502
            for(i=0; i<4; i++){
2503
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2504
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2505
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2506
                }
2507
            }
2508
    }
2509
#ifdef HAVE_XVMC
2510
// MPV_frame_start will call this function too,
2511
// but we need to call it on every field
2512
    if(s->avctx->xvmc_acceleration)
2513
         XVMC_field_start(s,avctx);
2514
#endif
2515

    
2516
    return 0;
2517
}
2518

    
2519
#define DECODE_SLICE_ERROR -1
2520
#define DECODE_SLICE_OK 0
2521

    
2522
/**
2523
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2524
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2525
 *         DECODE_SLICE_OK if this slice is ok<br>
2526
 */
2527
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2528
                             const uint8_t **buf, int buf_size)
2529
{
2530
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2531
    AVCodecContext *avctx= s->avctx;
2532
    int ret;
2533
    const int field_pic= s->picture_structure != PICT_FRAME;
2534
    const int lowres= s->avctx->lowres;
2535

    
2536
    s->resync_mb_x=
2537
    s->resync_mb_y= -1;
2538

    
2539
    if (mb_y<<field_pic >= s->mb_height){
2540
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2541
        return -1;
2542
    }
2543

    
2544
    init_get_bits(&s->gb, *buf, buf_size*8);
2545

    
2546
    ff_mpeg1_clean_buffers(s);
2547
    s->interlaced_dct = 0;
2548

    
2549
    s->qscale = get_qscale(s);
2550

    
2551
    if(s->qscale == 0){
2552
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2553
        return -1;
2554
    }
2555

    
2556
    /* extra slice info */
2557
    while (get_bits1(&s->gb) != 0) {
2558
        skip_bits(&s->gb, 8);
2559
    }
2560

    
2561
    s->mb_x=0;
2562

    
2563
    for(;;) {
2564
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2565
        if (code < 0){
2566
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2567
            return -1;
2568
        }
2569
        if (code >= 33) {
2570
            if (code == 33) {
2571
                s->mb_x += 33;
2572
            }
2573
            /* otherwise, stuffing, nothing to do */
2574
        } else {
2575
            s->mb_x += code;
2576
            break;
2577
        }
2578
    }
2579

    
2580
    s->resync_mb_x= s->mb_x;
2581
    s->resync_mb_y= s->mb_y= mb_y;
2582
    s->mb_skip_run= 0;
2583
    ff_init_block_index(s);
2584

    
2585
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2586
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2587
             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",
2588
                 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],
2589
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2590
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2591
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2592
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2593
        }
2594
    }
2595

    
2596
    for(;;) {
2597
#ifdef HAVE_XVMC
2598
        //one 1 we memcpy blocks in xvmcvideo
2599
        if(s->avctx->xvmc_acceleration > 1)
2600
            XVMC_init_block(s);//set s->block
2601
#endif
2602

    
2603
        ret = mpeg_decode_mb(s, s->block);
2604
        s->chroma_qscale= s->qscale;
2605

    
2606
        dprintf("ret=%d\n", ret);
2607
        if (ret < 0)
2608
            return -1;
2609

    
2610
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2611
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2612
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2613
            int motion_x, motion_y, dir, i;
2614
            if(field_pic && !s->first_field)
2615
                xy += wrap/2;
2616

    
2617
            for(i=0; i<2; i++){
2618
                for(dir=0; dir<2; dir++){
2619
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2620
                        motion_x = motion_y = 0;
2621
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2622
                        motion_x = s->mv[dir][0][0];
2623
                        motion_y = s->mv[dir][0][1];
2624
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2625
                        motion_x = s->mv[dir][i][0];
2626
                        motion_y = s->mv[dir][i][1];
2627
                    }
2628

    
2629
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2630
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2631
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2632
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2633
                    s->current_picture.ref_index [dir][xy    ]=
2634
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2635
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2636
                }
2637
                xy += wrap;
2638
            }
2639
        }
2640

    
2641
        s->dest[0] += 16 >> lowres;
2642
        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2643
        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2644

    
2645
        MPV_decode_mb(s, s->block);
2646

    
2647
        if (++s->mb_x >= s->mb_width) {
2648
            const int mb_size= 16>>s->avctx->lowres;
2649

    
2650
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2651

    
2652
            s->mb_x = 0;
2653
            s->mb_y++;
2654

    
2655
            if(s->mb_y<<field_pic >= s->mb_height){
2656
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2657
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2658
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2659
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2660

    
2661
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2662
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2663
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2664
                    return -1;
2665
                }else
2666
                    goto eos;
2667
            }
2668

    
2669
            ff_init_block_index(s);
2670
        }
2671

    
2672
        /* skip mb handling */
2673
        if (s->mb_skip_run == -1) {
2674
            /* read again increment */
2675
            s->mb_skip_run = 0;
2676
            for(;;) {
2677
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2678
                if (code < 0){
2679
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2680
                    return -1;
2681
                }
2682
                if (code >= 33) {
2683
                    if (code == 33) {
2684
                        s->mb_skip_run += 33;
2685
                    }else if(code == 35){
2686
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2687
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2688
                            return -1;
2689
                        }
2690
                        goto eos; /* end of slice */
2691
                    }
2692
                    /* otherwise, stuffing, nothing to do */
2693
                } else {
2694
                    s->mb_skip_run += code;
2695
                    break;
2696
                }
2697
            }
2698
        }
2699
    }
2700
eos: // end of slice
2701
    *buf += get_bits_count(&s->gb)/8 - 1;
2702
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2703
    return 0;
2704
}
2705

    
2706
static int slice_decode_thread(AVCodecContext *c, void *arg){
2707
    MpegEncContext *s= arg;
2708
    const uint8_t *buf= s->gb.buffer;
2709
    int mb_y= s->start_mb_y;
2710

    
2711
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2712

    
2713
    for(;;){
2714
        uint32_t start_code;
2715
        int ret;
2716

    
2717
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2718
        emms_c();
2719
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2720
//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);
2721
        if(ret < 0){
2722
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2723
                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);
2724
        }else{
2725
            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);
2726
        }
2727

    
2728
        if(s->mb_y == s->end_mb_y)
2729
            return 0;
2730

    
2731
        start_code= -1;
2732
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2733
        mb_y= start_code - SLICE_MIN_START_CODE;
2734
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2735
            return -1;
2736
    }
2737

    
2738
    return 0; //not reached
2739
}
2740

    
2741
/**
2742
 * handles slice ends.
2743
 * @return 1 if it seems to be the last slice of
2744
 */
2745
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2746
{
2747
    Mpeg1Context *s1 = avctx->priv_data;
2748
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2749

    
2750
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2751
        return 0;
2752

    
2753
#ifdef HAVE_XVMC
2754
    if(s->avctx->xvmc_acceleration)
2755
        XVMC_field_end(s);
2756
#endif
2757
    /* end of slice reached */
2758
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2759
        /* end of image */
2760

    
2761
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2762

    
2763
        ff_er_frame_end(s);
2764

    
2765
        MPV_frame_end(s);
2766

    
2767
        if (s->pict_type == B_TYPE || s->low_delay) {
2768
            *pict= *(AVFrame*)s->current_picture_ptr;
2769
            ff_print_debug_info(s, pict);
2770
        } else {
2771
            s->picture_number++;
2772
            /* latency of 1 frame for I and P frames */
2773
            /* XXX: use another variable than picture_number */
2774
            if (s->last_picture_ptr != NULL) {
2775
                *pict= *(AVFrame*)s->last_picture_ptr;
2776
                 ff_print_debug_info(s, pict);
2777
            }
2778
        }
2779

    
2780
        return 1;
2781
    } else {
2782
        return 0;
2783
    }
2784
}
2785

    
2786
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2787
                                 const uint8_t *buf, int buf_size)
2788
{
2789
    Mpeg1Context *s1 = avctx->priv_data;
2790
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2791
    int width,height;
2792
    int i, v, j;
2793

    
2794
    init_get_bits(&s->gb, buf, buf_size*8);
2795

    
2796
    width = get_bits(&s->gb, 12);
2797
    height = get_bits(&s->gb, 12);
2798
    if (width <= 0 || height <= 0 ||
2799
        (width % 2) != 0 || (height % 2) != 0)
2800
        return -1;
2801
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2802
    if (s->aspect_ratio_info == 0)
2803
        return -1;
2804
    s->frame_rate_index = get_bits(&s->gb, 4);
2805
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2806
        return -1;
2807
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2808
    if (get_bits1(&s->gb) == 0) /* marker */
2809
        return -1;
2810
    s->width = width;
2811
    s->height = height;
2812

    
2813
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2814
    skip_bits(&s->gb, 1);
2815

    
2816
    /* get matrix */
2817
    if (get_bits1(&s->gb)) {
2818
        for(i=0;i<64;i++) {
2819
            v = get_bits(&s->gb, 8);
2820
            if(v==0){
2821
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2822
                return -1;
2823
            }
2824
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2825
            s->intra_matrix[j] = v;
2826
            s->chroma_intra_matrix[j] = v;
2827
        }
2828
#ifdef DEBUG
2829
        dprintf("intra matrix present\n");
2830
        for(i=0;i<64;i++)
2831
            dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2832
        dprintf("\n");
2833
#endif
2834
    } else {
2835
        for(i=0;i<64;i++) {
2836
            j = s->dsp.idct_permutation[i];
2837
            v = ff_mpeg1_default_intra_matrix[i];
2838
            s->intra_matrix[j] = v;
2839
            s->chroma_intra_matrix[j] = v;
2840
        }
2841
    }
2842
    if (get_bits1(&s->gb)) {
2843
        for(i=0;i<64;i++) {
2844
            v = get_bits(&s->gb, 8);
2845
            if(v==0){
2846
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2847
                return -1;
2848
            }
2849
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2850
            s->inter_matrix[j] = v;
2851
            s->chroma_inter_matrix[j] = v;
2852
        }
2853
#ifdef DEBUG
2854
        dprintf("non intra matrix present\n");
2855
        for(i=0;i<64;i++)
2856
            dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2857
        dprintf("\n");
2858
#endif
2859
    } else {
2860
        for(i=0;i<64;i++) {
2861
            int j= s->dsp.idct_permutation[i];
2862
            v = ff_mpeg1_default_non_intra_matrix[i];
2863
            s->inter_matrix[j] = v;
2864
            s->chroma_inter_matrix[j] = v;
2865
        }
2866
    }
2867

    
2868
    if(show_bits(&s->gb, 23) != 0){
2869
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2870
        return -1;
2871
    }
2872

    
2873
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2874
    s->progressive_sequence = 1;
2875
    s->progressive_frame = 1;
2876
    s->picture_structure = PICT_FRAME;
2877
    s->frame_pred_frame_dct = 1;
2878
    s->chroma_format = 1;
2879
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2880
    avctx->sub_id = 1; /* indicates mpeg1 */
2881
    s->out_format = FMT_MPEG1;
2882
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2883
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2884

    
2885
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2886
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2887
               s->avctx->rc_buffer_size, s->bit_rate);
2888

    
2889
    return 0;
2890
}
2891

    
2892
static int vcr2_init_sequence(AVCodecContext *avctx)
2893
{
2894
    Mpeg1Context *s1 = avctx->priv_data;
2895
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2896
    int i, v;
2897

    
2898
    /* start new mpeg1 context decoding */
2899
    s->out_format = FMT_MPEG1;
2900
    if (s1->mpeg_enc_ctx_allocated) {
2901
        MPV_common_end(s);
2902
    }
2903
    s->width  = avctx->coded_width;
2904
    s->height = avctx->coded_height;
2905
    avctx->has_b_frames= 0; //true?
2906
    s->low_delay= 1;
2907

    
2908
    if(avctx->xvmc_acceleration){
2909
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2910
    }else{
2911
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2912
    }
2913

    
2914
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2915
        if( avctx->idct_algo == FF_IDCT_AUTO )
2916
            avctx->idct_algo = FF_IDCT_SIMPLE;
2917

    
2918
    if (MPV_common_init(s) < 0)
2919
        return -1;
2920
    exchange_uv(s);//common init reset pblocks, so we swap them here
2921
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2922
    s1->mpeg_enc_ctx_allocated = 1;
2923

    
2924
    for(i=0;i<64;i++) {
2925
        int j= s->dsp.idct_permutation[i];
2926
        v = ff_mpeg1_default_intra_matrix[i];
2927
        s->intra_matrix[j] = v;
2928
        s->chroma_intra_matrix[j] = v;
2929

    
2930
        v = ff_mpeg1_default_non_intra_matrix[i];
2931
        s->inter_matrix[j] = v;
2932
        s->chroma_inter_matrix[j] = v;
2933
    }
2934

    
2935
    s->progressive_sequence = 1;
2936
    s->progressive_frame = 1;
2937
    s->picture_structure = PICT_FRAME;
2938
    s->frame_pred_frame_dct = 1;
2939
    s->chroma_format = 1;
2940
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2941
    avctx->sub_id = 2; /* indicates mpeg2 */
2942
    return 0;
2943
}
2944

    
2945

    
2946
static void mpeg_decode_user_data(AVCodecContext *avctx,
2947
                                  const uint8_t *buf, int buf_size)
2948
{
2949
    const uint8_t *p;
2950
    int len, flags;
2951
    p = buf;
2952
    len = buf_size;
2953

    
2954
    /* we parse the DTG active format information */
2955
    if (len >= 5 &&
2956
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2957
        flags = p[4];
2958
        p += 5;
2959
        len -= 5;
2960
        if (flags & 0x80) {
2961
            /* skip event id */
2962
            if (len < 2)
2963
                return;
2964
            p += 2;
2965
            len -= 2;
2966
        }
2967
        if (flags & 0x40) {
2968
            if (len < 1)
2969
                return;
2970
            avctx->dtg_active_format = p[0] & 0x0f;
2971
        }
2972
    }
2973
}
2974

    
2975
static void mpeg_decode_gop(AVCodecContext *avctx,
2976
                            const uint8_t *buf, int buf_size){
2977
    Mpeg1Context *s1 = avctx->priv_data;
2978
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2979

    
2980
    int drop_frame_flag;
2981
    int time_code_hours, time_code_minutes;
2982
    int time_code_seconds, time_code_pictures;
2983
    int broken_link;
2984

    
2985
    init_get_bits(&s->gb, buf, buf_size*8);
2986

    
2987
    drop_frame_flag = get_bits1(&s->gb);
2988

    
2989
    time_code_hours=get_bits(&s->gb,5);
2990
    time_code_minutes = get_bits(&s->gb,6);
2991
    skip_bits1(&s->gb);//marker bit
2992
    time_code_seconds = get_bits(&s->gb,6);
2993
    time_code_pictures = get_bits(&s->gb,6);
2994

    
2995
    /*broken_link indicate that after editing the
2996
      reference frames of the first B-Frames after GOP I-Frame
2997
      are missing (open gop)*/
2998
    broken_link = get_bits1(&s->gb);
2999

    
3000
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
3001
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
3002
            time_code_hours, time_code_minutes, time_code_seconds,
3003
            time_code_pictures, broken_link);
3004
}
3005
/**
3006
 * finds the end of the current frame in the bitstream.
3007
 * @return the position of the first byte of the next frame, or -1
3008
 */
3009
static int mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
3010
{
3011
    int i;
3012
    uint32_t state= pc->state;
3013

    
3014
    i=0;
3015
    if(!pc->frame_start_found){
3016
        for(i=0; i<buf_size; i++){
3017
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3018
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3019
                i++;
3020
                pc->frame_start_found=1;
3021
                break;
3022
            }
3023
        }
3024
    }
3025

    
3026
    if(pc->frame_start_found){
3027
        /* EOF considered as end of frame */
3028
        if (buf_size == 0)
3029
            return 0;
3030
        for(; i<buf_size; i++){
3031
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3032
            if((state&0xFFFFFF00) == 0x100){
3033
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3034
                    pc->frame_start_found=0;
3035
                    pc->state=-1;
3036
                    return i-3;
3037
                }
3038
            }
3039
        }
3040
    }
3041
    pc->state= state;
3042
    return END_NOT_FOUND;
3043
}
3044

    
3045
/* handle buffering and image synchronisation */
3046
static int mpeg_decode_frame(AVCodecContext *avctx,
3047
                             void *data, int *data_size,
3048
                             uint8_t *buf, int buf_size)
3049
{
3050
    Mpeg1Context *s = avctx->priv_data;
3051
    const uint8_t *buf_end;
3052
    const uint8_t *buf_ptr;
3053
    uint32_t start_code;
3054
    int ret, input_size;
3055
    AVFrame *picture = data;
3056
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
3057
    dprintf("fill_buffer\n");
3058

    
3059
    if (buf_size == 0) {
3060
        /* special case for last picture */
3061
        if (s2->low_delay==0 && s2->next_picture_ptr) {
3062
            *picture= *(AVFrame*)s2->next_picture_ptr;
3063
            s2->next_picture_ptr= NULL;
3064

    
3065
            *data_size = sizeof(AVFrame);
3066
        }
3067
        return 0;
3068
    }
3069

    
3070
    if(s2->flags&CODEC_FLAG_TRUNCATED){
3071
        int next= mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3072

    
3073
        if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3074
            return buf_size;
3075
    }
3076

    
3077
    buf_ptr = buf;
3078
    buf_end = buf + buf_size;
3079

    
3080
#if 0
3081
    if (s->repeat_field % 2 == 1) {
3082
        s->repeat_field++;
3083
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3084
        //        s2->picture_number, s->repeat_field);
3085
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3086
            *data_size = sizeof(AVPicture);
3087
            goto the_end;
3088
        }
3089
    }
3090
#endif
3091

    
3092
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3093
        vcr2_init_sequence(avctx);
3094

    
3095
    s->slice_count= 0;
3096

    
3097
    for(;;) {
3098
        /* find start next code */
3099
        start_code = -1;
3100
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3101
        if (start_code > 0x1ff){
3102
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3103
                if(avctx->thread_count > 1){
3104
                    int i;
3105

    
3106
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3107
                    for(i=0; i<s->slice_count; i++)
3108
                        s2->error_count += s2->thread_context[i]->error_count;
3109
                }
3110
                if (slice_end(avctx, picture)) {
3111
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3112
                        *data_size = sizeof(AVPicture);
3113
                }
3114
            }
3115
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3116
        }
3117

    
3118
        input_size = buf_end - buf_ptr;
3119

    
3120
        if(avctx->debug & FF_DEBUG_STARTCODE){
3121
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3122
        }
3123

    
3124
        /* prepare data for next start code */
3125
        switch(start_code) {
3126
        case SEQ_START_CODE:
3127
            mpeg1_decode_sequence(avctx, buf_ptr,
3128
                                    input_size);
3129
            break;
3130

    
3131
        case PICTURE_START_CODE:
3132
            /* we have a complete image : we try to decompress it */
3133
            mpeg1_decode_picture(avctx,
3134
                                    buf_ptr, input_size);
3135
            break;
3136
        case EXT_START_CODE:
3137
            mpeg_decode_extension(avctx,
3138
                                    buf_ptr, input_size);
3139
            break;
3140
        case USER_START_CODE:
3141
            mpeg_decode_user_data(avctx,
3142
                                    buf_ptr, input_size);
3143
            break;
3144
        case GOP_START_CODE:
3145
            s2->first_field=0;
3146
            mpeg_decode_gop(avctx,
3147
                                    buf_ptr, input_size);
3148
            break;
3149
        default:
3150
            if (start_code >= SLICE_MIN_START_CODE &&
3151
                start_code <= SLICE_MAX_START_CODE) {
3152
                int mb_y= start_code - SLICE_MIN_START_CODE;
3153

    
3154
                if(s2->last_picture_ptr==NULL){
3155
                /* skip b frames if we dont have reference frames */
3156
                    if(s2->pict_type==B_TYPE) break;
3157
                /* skip P frames if we dont have reference frame no valid header */
3158
//                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3159
                }
3160
                /* skip b frames if we are in a hurry */
3161
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3162
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3163
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3164
                    || avctx->skip_frame >= AVDISCARD_ALL)
3165
                    break;
3166
                /* skip everything if we are in a hurry>=5 */
3167
                if(avctx->hurry_up>=5) break;
3168

    
3169
                if (!s->mpeg_enc_ctx_allocated) break;
3170

    
3171
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3172
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3173
                        break;
3174
                }
3175

    
3176
                if(s2->first_slice){
3177
                    s2->first_slice=0;
3178
                            if(mpeg_field_start(s2) < 0)
3179
                        return -1;
3180
                    }
3181

    
3182
                if(avctx->thread_count > 1){
3183
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3184
                    if(threshold <= mb_y){
3185
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3186

    
3187
                        thread_context->start_mb_y= mb_y;
3188
                        thread_context->end_mb_y  = s2->mb_height;
3189
                        if(s->slice_count){
3190
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3191
                            ff_update_duplicate_context(thread_context, s2);
3192
                        }
3193
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3194
                        s->slice_count++;
3195
                    }
3196
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
3197
                }else{
3198
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3199
                    emms_c();
3200

    
3201
                    if(ret < 0){
3202
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3203
                            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);
3204
                    }else{
3205
                        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);
3206
                    }
3207
                }
3208
            }
3209
            break;
3210
        }
3211
    }
3212
}
3213

    
3214
static int mpeg_decode_end(AVCodecContext *avctx)
3215
{
3216
    Mpeg1Context *s = avctx->priv_data;
3217

    
3218
    if (s->mpeg_enc_ctx_allocated)
3219
        MPV_common_end(&s->mpeg_enc_ctx);
3220
    return 0;
3221
}
3222

    
3223
AVCodec mpeg1video_decoder = {
3224
    "mpeg1video",
3225
    CODEC_TYPE_VIDEO,
3226
    CODEC_ID_MPEG1VIDEO,
3227
    sizeof(Mpeg1Context),
3228
    mpeg_decode_init,
3229
    NULL,
3230
    mpeg_decode_end,
3231
    mpeg_decode_frame,
3232
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3233
    .flush= ff_mpeg_flush,
3234
};
3235

    
3236
AVCodec mpeg2video_decoder = {
3237
    "mpeg2video",
3238
    CODEC_TYPE_VIDEO,
3239
    CODEC_ID_MPEG2VIDEO,
3240
    sizeof(Mpeg1Context),
3241
    mpeg_decode_init,
3242
    NULL,
3243
    mpeg_decode_end,
3244
    mpeg_decode_frame,
3245
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3246
    .flush= ff_mpeg_flush,
3247
};
3248

    
3249
//legacy decoder
3250
AVCodec mpegvideo_decoder = {
3251
    "mpegvideo",
3252
    CODEC_TYPE_VIDEO,
3253
    CODEC_ID_MPEG2VIDEO,
3254
    sizeof(Mpeg1Context),
3255
    mpeg_decode_init,
3256
    NULL,
3257
    mpeg_decode_end,
3258
    mpeg_decode_frame,
3259
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3260
    .flush= ff_mpeg_flush,
3261
};
3262

    
3263
#ifdef CONFIG_ENCODERS
3264

    
3265
AVCodec mpeg1video_encoder = {
3266
    "mpeg1video",
3267
    CODEC_TYPE_VIDEO,
3268
    CODEC_ID_MPEG1VIDEO,
3269
    sizeof(MpegEncContext),
3270
    encode_init,
3271
    MPV_encode_picture,
3272
    MPV_encode_end,
3273
    .supported_framerates= ff_frame_rate_tab+1,
3274
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3275
    .capabilities= CODEC_CAP_DELAY,
3276
};
3277

    
3278
AVCodec mpeg2video_encoder = {
3279
    "mpeg2video",
3280
    CODEC_TYPE_VIDEO,
3281
    CODEC_ID_MPEG2VIDEO,
3282
    sizeof(MpegEncContext),
3283
    encode_init,
3284
    MPV_encode_picture,
3285
    MPV_encode_end,
3286
    .supported_framerates= ff_frame_rate_tab+1,
3287
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3288
    .capabilities= CODEC_CAP_DELAY,
3289
};
3290
#endif
3291

    
3292
#ifdef HAVE_XVMC
3293
static int mpeg_mc_decode_init(AVCodecContext *avctx){
3294
    Mpeg1Context *s;
3295

    
3296
    if( avctx->thread_count > 1)
3297
        return -1;
3298
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3299
        return -1;
3300
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3301
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3302
    }
3303
    mpeg_decode_init(avctx);
3304
    s = avctx->priv_data;
3305

    
3306
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3307
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3308

    
3309
    return 0;
3310
}
3311

    
3312
AVCodec mpeg_xvmc_decoder = {
3313
    "mpegvideo_xvmc",
3314
    CODEC_TYPE_VIDEO,
3315
    CODEC_ID_MPEG2VIDEO_XVMC,
3316
    sizeof(Mpeg1Context),
3317
    mpeg_mc_decode_init,
3318
    NULL,
3319
    mpeg_decode_end,
3320
    mpeg_decode_frame,
3321
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3322
    .flush= ff_mpeg_flush,
3323
};
3324

    
3325
#endif
3326

    
3327
#ifdef CONFIG_MPEGVIDEO_PARSER
3328
static void mpegvideo_extract_headers(AVCodecParserContext *s,
3329
                                      AVCodecContext *avctx,
3330
                                      const uint8_t *buf, int buf_size)
3331
{
3332
    ParseContext1 *pc = s->priv_data;
3333
    const uint8_t *buf_end;
3334
    uint32_t start_code;
3335
    int frame_rate_index, ext_type, bytes_left;
3336
    int frame_rate_ext_n, frame_rate_ext_d;
3337
    int picture_structure, top_field_first, repeat_first_field, progressive_frame;
3338
    int horiz_size_ext, vert_size_ext, bit_rate_ext;
3339
//FIXME replace the crap with get_bits()
3340
    s->repeat_pict = 0;
3341
    buf_end = buf + buf_size;
3342
    while (buf < buf_end) {
3343
        start_code= -1;
3344
        buf= ff_find_start_code(buf, buf_end, &start_code);
3345
        bytes_left = buf_end - buf;
3346
        switch(start_code) {
3347
        case PICTURE_START_CODE:
3348
            if (bytes_left >= 2) {
3349
                s->pict_type = (buf[1] >> 3) & 7;
3350
            }
3351
            break;
3352
        case SEQ_START_CODE:
3353
            if (bytes_left >= 7) {
3354
                pc->width  = (buf[0] << 4) | (buf[1] >> 4);
3355
                pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
3356
                avcodec_set_dimensions(avctx, pc->width, pc->height);
3357
                frame_rate_index = buf[3] & 0xf;
3358
                pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
3359
                pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
3360
                avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
3361
                avctx->codec_id = CODEC_ID_MPEG1VIDEO;
3362
                avctx->sub_id = 1;
3363
            }
3364
            break;
3365
        case EXT_START_CODE:
3366
            if (bytes_left >= 1) {
3367
                ext_type = (buf[0] >> 4);
3368
                switch(ext_type) {
3369
                case 0x1: /* sequence extension */
3370
                    if (bytes_left >= 6) {
3371
                        horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
3372
                        vert_size_ext = (buf[2] >> 5) & 3;
3373
                        bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
3374
                        frame_rate_ext_n = (buf[5] >> 5) & 3;
3375
                        frame_rate_ext_d = (buf[5] & 0x1f);
3376
                        pc->progressive_sequence = buf[1] & (1 << 3);
3377
                        avctx->has_b_frames= !(buf[5] >> 7);
3378

    
3379
                        pc->width  |=(horiz_size_ext << 12);
3380
                        pc->height |=( vert_size_ext << 12);
3381
                        avctx->bit_rate += (bit_rate_ext << 18) * 400;
3382
                        avcodec_set_dimensions(avctx, pc->width, pc->height);
3383
                        avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
3384
                        avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
3385
                        avctx->codec_id = CODEC_ID_MPEG2VIDEO;
3386
                        avctx->sub_id = 2; /* forces MPEG2 */
3387
                    }
3388
                    break;
3389
                case 0x8: /* picture coding extension */
3390
                    if (bytes_left >= 5) {
3391
                        picture_structure = buf[2]&3;
3392
                        top_field_first = buf[3] & (1 << 7);
3393
                        repeat_first_field = buf[3] & (1 << 1);
3394
                        progressive_frame = buf[4] & (1 << 7);
3395

    
3396
                        /* check if we must repeat the frame */
3397
                        if (repeat_first_field) {
3398
                            if (pc->progressive_sequence) {
3399
                                if (top_field_first)
3400
                                    s->repeat_pict = 4;
3401
                                else
3402
                                    s->repeat_pict = 2;
3403
                            } else if (progressive_frame) {
3404
                                s->repeat_pict = 1;
3405
                            }
3406
                        }
3407

    
3408
                        /* the packet only represents half a frame
3409
                           XXX,FIXME maybe find a different solution */
3410
                        if(picture_structure != 3)
3411
                            s->repeat_pict = -1;
3412
                    }
3413
                    break;
3414
                }
3415
            }
3416
            break;
3417
        case -1:
3418
            goto the_end;
3419
        default:
3420
            /* we stop parsing when we encounter a slice. It ensures
3421
               that this function takes a negligible amount of time */
3422
            if (start_code >= SLICE_MIN_START_CODE &&
3423
                start_code <= SLICE_MAX_START_CODE)
3424
                goto the_end;
3425
            break;
3426
        }
3427
    }
3428
 the_end: ;
3429
}
3430

    
3431
static int mpegvideo_parse(AVCodecParserContext *s,
3432
                           AVCodecContext *avctx,
3433
                           uint8_t **poutbuf, int *poutbuf_size,
3434
                           const uint8_t *buf, int buf_size)
3435
{
3436
    ParseContext1 *pc1 = s->priv_data;
3437
    ParseContext *pc= &pc1->pc;
3438
    int next;
3439

    
3440
    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
3441
        next= buf_size;
3442
    }else{
3443
        next= mpeg1_find_frame_end(pc, buf, buf_size);
3444

    
3445
        if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
3446
            *poutbuf = NULL;
3447
            *poutbuf_size = 0;
3448
            return buf_size;
3449
        }
3450

    
3451
    }
3452
    /* we have a full frame : we just parse the first few MPEG headers
3453
       to have the full timing information. The time take by this
3454
       function should be negligible for uncorrupted streams */
3455
    mpegvideo_extract_headers(s, avctx, buf, buf_size);
3456
#if 0
3457
    printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
3458
           s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
3459
#endif
3460

    
3461
    *poutbuf = (uint8_t *)buf;
3462
    *poutbuf_size = buf_size;
3463
    return next;
3464
}
3465

    
3466
static int mpegvideo_split(AVCodecContext *avctx,
3467
                           const uint8_t *buf, int buf_size)
3468
{
3469
    int i;
3470
    uint32_t state= -1;
3471

    
3472
    for(i=0; i<buf_size; i++){
3473
        state= (state<<8) | buf[i];
3474
        if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
3475
            return i-3;
3476
    }
3477
    return 0;
3478
}
3479

    
3480
AVCodecParser mpegvideo_parser = {
3481
    { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
3482
    sizeof(ParseContext1),
3483
    NULL,
3484
    mpegvideo_parse,
3485
    ff_parse1_close,
3486
    mpegvideo_split,
3487
};
3488
#endif /* !CONFIG_MPEGVIDEO_PARSER */
3489

    
3490
/* this is ugly i know, but the alternative is too make
3491
   hundreds of vars global and prefix them with ff_mpeg1_
3492
   which is far uglier. */
3493
#include "mdec.c"