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ffmpeg / libavcodec / mpeg12.c @ 761089b0

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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 library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10
 *
11
 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20

    
21
/**
22
 * @file mpeg12.c
23
 * MPEG1/2 codec
24
 */
25

    
26
//#define DEBUG
27
#include "avcodec.h"
28
#include "dsputil.h"
29
#include "mpegvideo.h"
30

    
31
#include "mpeg12data.h"
32

    
33
//#undef NDEBUG
34
//#include <assert.h>
35

    
36

    
37
/* Start codes. */
38
#define SEQ_END_CODE            0x000001b7
39
#define SEQ_START_CODE          0x000001b3
40
#define GOP_START_CODE          0x000001b8
41
#define PICTURE_START_CODE      0x00000100
42
#define SLICE_MIN_START_CODE    0x00000101
43
#define SLICE_MAX_START_CODE    0x000001af
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#define EXT_START_CODE          0x000001b5
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#define USER_START_CODE         0x000001b2
46

    
47
#define DC_VLC_BITS 9
48
#define MV_VLC_BITS 9
49
#define MBINCR_VLC_BITS 9
50
#define MB_PAT_VLC_BITS 9
51
#define MB_PTYPE_VLC_BITS 6
52
#define MB_BTYPE_VLC_BITS 6
53
#define TEX_VLC_BITS 9
54

    
55
#ifdef CONFIG_ENCODERS
56
static void mpeg1_encode_block(MpegEncContext *s,
57
                         DCTELEM *block,
58
                         int component);
59
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
60
#endif //CONFIG_ENCODERS
61
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
63
                              int n);
64
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);
68
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
70
                                        int n);
71
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
72
                                    DCTELEM *block,
73
                                    int n);
74
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
75
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
76
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
77
static void exchange_uv(MpegEncContext *s);
78

    
79
#ifdef HAVE_XVMC
80
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
81
extern int XVMC_field_end(MpegEncContext *s);
82
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
83
extern void XVMC_init_block(MpegEncContext *s);//set s->block
84
#endif
85

    
86
const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
87
const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
88
const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
89
const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
90
                                           PIX_FMT_XVMC_MPEG2_IDCT,
91
                                           PIX_FMT_XVMC_MPEG2_MC,
92
                                           -1};
93
#ifdef CONFIG_ENCODERS
94
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
95
static uint8_t fcode_tab[MAX_MV*2+1];
96

    
97
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
98
static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
99

    
100
/* simple include everything table for dc, first byte is bits number next 3 are code*/
101
static uint32_t mpeg1_lum_dc_uni[512];
102
static uint32_t mpeg1_chr_dc_uni[512];
103

    
104
static uint8_t mpeg1_index_run[2][64];
105
static int8_t mpeg1_max_level[2][64];
106
#endif //CONFIG_ENCODERS
107

    
108
static void init_2d_vlc_rl(RLTable *rl, int use_static)
109
{
110
    int i;
111

    
112
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
113
             &rl->table_vlc[0][1], 4, 2,
114
             &rl->table_vlc[0][0], 4, 2, use_static);
115

    
116
    if(use_static)
117
        rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
118
    else
119
        rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
120

    
121
    for(i=0; i<rl->vlc.table_size; i++){
122
        int code= rl->vlc.table[i][0];
123
        int len = rl->vlc.table[i][1];
124
        int level, run;
125

    
126
        if(len==0){ // illegal code
127
            run= 65;
128
            level= MAX_LEVEL;
129
        }else if(len<0){ //more bits needed
130
            run= 0;
131
            level= code;
132
        }else{
133
            if(code==rl->n){ //esc
134
                run= 65;
135
                level= 0;
136
            }else if(code==rl->n+1){ //eob
137
                run= 0;
138
                level= 127;
139
            }else{
140
                run=   rl->table_run  [code] + 1;
141
                level= rl->table_level[code];
142
            }
143
        }
144
        rl->rl_vlc[0][i].len= len;
145
        rl->rl_vlc[0][i].level= level;
146
        rl->rl_vlc[0][i].run= run;
147
    }
148
}
149

    
150
#ifdef CONFIG_ENCODERS
151
static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
152
    int i;
153

    
154
    for(i=0; i<128; i++){
155
        int level= i-64;
156
        int run;
157
        for(run=0; run<64; run++){
158
            int len, bits, code;
159

    
160
            int alevel= ABS(level);
161
            int sign= (level>>31)&1;
162

    
163
            if (alevel > rl->max_level[0][run])
164
                code= 111; /*rl->n*/
165
            else
166
                code= rl->index_run[0][run] + alevel - 1;
167

    
168
            if (code < 111 /* rl->n */) {
169
                /* store the vlc & sign at once */
170
                len=   rl->table_vlc[code][1]+1;
171
                bits= (rl->table_vlc[code][0]<<1) + sign;
172
            } else {
173
                len=  rl->table_vlc[111/*rl->n*/][1]+6;
174
                bits= rl->table_vlc[111/*rl->n*/][0]<<6;
175

    
176
                bits|= run;
177
                if (alevel < 128) {
178
                    bits<<=8; len+=8;
179
                    bits|= level & 0xff;
180
                } else {
181
                    bits<<=16; len+=16;
182
                    bits|= level & 0xff;
183
                    if (level < 0) {
184
                        bits|= 0x8001 + level + 255;
185
                    } else {
186
                        bits|= level & 0xffff;
187
                    }
188
                }
189
            }
190

    
191
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
192
        }
193
    }
194
}
195

    
196

    
197
static int find_frame_rate_index(MpegEncContext *s){
198
    int i;
199
    int64_t dmin= INT64_MAX;
200
    int64_t d;
201

    
202
    for(i=1;i<14;i++) {
203
        int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
204
        int64_t n1= 1001LL*s->avctx->time_base.den;
205
        if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
206

    
207
        d = ABS(n0 - n1);
208
        if(d < dmin){
209
            dmin=d;
210
            s->frame_rate_index= i;
211
        }
212
    }
213
    if(dmin)
214
        return -1;
215
    else
216
        return 0;
217
}
218

    
219
static int encode_init(AVCodecContext *avctx)
220
{
221
    MpegEncContext *s = avctx->priv_data;
222

    
223
    if(MPV_encode_init(avctx) < 0)
224
        return -1;
225

    
226
    if(find_frame_rate_index(s) < 0){
227
        if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
228
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
229
            return -1;
230
        }else{
231
            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);
232
        }
233
    }
234

    
235
    if(avctx->profile == FF_PROFILE_UNKNOWN)
236
        avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
237

    
238
    if(avctx->level == FF_LEVEL_UNKNOWN)
239
        avctx->level = s->chroma_format == CHROMA_420 ? 8 : 5;
240

    
241
    return 0;
242
}
243

    
244
static void put_header(MpegEncContext *s, int header)
245
{
246
    align_put_bits(&s->pb);
247
    put_bits(&s->pb, 16, header>>16);
248
    put_bits(&s->pb, 16, header&0xFFFF);
249
}
250

    
251
/* put sequence header if needed */
252
static void mpeg1_encode_sequence_header(MpegEncContext *s)
253
{
254
        unsigned int vbv_buffer_size;
255
        unsigned int fps, v;
256
        int i;
257
        uint64_t time_code;
258
        float best_aspect_error= 1E10;
259
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
260
        int constraint_parameter_flag;
261

    
262
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
263

    
264
        if (s->current_picture.key_frame) {
265
            AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
266

    
267
            /* mpeg1 header repeated every gop */
268
            put_header(s, SEQ_START_CODE);
269

    
270
            put_bits(&s->pb, 12, s->width);
271
            put_bits(&s->pb, 12, s->height);
272

    
273
            for(i=1; i<15; i++){
274
                float error= aspect_ratio;
275
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
276
                    error-= 1.0/mpeg1_aspect[i];
277
                else
278
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
279

    
280
                error= ABS(error);
281

    
282
                if(error < best_aspect_error){
283
                    best_aspect_error= error;
284
                    s->aspect_ratio_info= i;
285
                }
286
            }
287

    
288
            put_bits(&s->pb, 4, s->aspect_ratio_info);
289
            put_bits(&s->pb, 4, s->frame_rate_index);
290

    
291
            if(s->avctx->rc_max_rate){
292
                v = (s->avctx->rc_max_rate + 399) / 400;
293
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
294
                    v = 0x3ffff;
295
            }else{
296
                v= 0x3FFFF;
297
            }
298

    
299
            if(s->avctx->rc_buffer_size)
300
                vbv_buffer_size = s->avctx->rc_buffer_size;
301
            else
302
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
303
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
304
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
305

    
306
            put_bits(&s->pb, 18, v & 0x3FFFF);
307
            put_bits(&s->pb, 1, 1); /* marker */
308
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
309

    
310
            constraint_parameter_flag=
311
                s->width <= 768 && s->height <= 576 &&
312
                s->mb_width * s->mb_height <= 396 &&
313
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
314
                framerate.num <= framerate.den*30 &&
315
                s->avctx->me_range && s->avctx->me_range < 128 &&
316
                vbv_buffer_size <= 20 &&
317
                v <= 1856000/400 &&
318
                s->codec_id == CODEC_ID_MPEG1VIDEO;
319

    
320
            put_bits(&s->pb, 1, constraint_parameter_flag);
321

    
322
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
323
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
324

    
325
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
326
                put_header(s, EXT_START_CODE);
327
                put_bits(&s->pb, 4, 1); //seq ext
328

    
329
                put_bits(&s->pb, 1, s->chroma_format == CHROMA_422); //escx
330

    
331
                put_bits(&s->pb, 3, s->avctx->profile); //profile
332
                put_bits(&s->pb, 4, s->avctx->level); //level
333

    
334
                put_bits(&s->pb, 1, s->progressive_sequence);
335
                put_bits(&s->pb, 2, s->chroma_format);
336
                put_bits(&s->pb, 2, 0); //horizontal size ext
337
                put_bits(&s->pb, 2, 0); //vertical size ext
338
                put_bits(&s->pb, 12, v>>18); //bitrate ext
339
                put_bits(&s->pb, 1, 1); //marker
340
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
341
                put_bits(&s->pb, 1, s->low_delay);
342
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
343
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
344
            }
345

    
346
            put_header(s, GOP_START_CODE);
347
            put_bits(&s->pb, 1, 0); /* do drop frame */
348
            /* time code : we must convert from the real frame rate to a
349
               fake mpeg frame rate in case of low frame rate */
350
            fps = (framerate.num + framerate.den/2)/ framerate.den;
351
            time_code = s->current_picture_ptr->coded_picture_number;
352

    
353
            s->gop_picture_number = time_code;
354
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
355
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
356
            put_bits(&s->pb, 1, 1);
357
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
358
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
359
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
360
            put_bits(&s->pb, 1, 0); /* broken link */
361
        }
362
}
363

    
364
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
365
    while (run >= 33) {
366
        put_bits(&s->pb, 11, 0x008);
367
        run -= 33;
368
    }
369
    put_bits(&s->pb, mbAddrIncrTable[run][1],
370
             mbAddrIncrTable[run][0]);
371
}
372
#endif //CONFIG_ENCODERS
373

    
374
static void common_init(MpegEncContext *s)
375
{
376

    
377
    s->y_dc_scale_table=
378
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
379

    
380
}
381

    
382
void ff_mpeg1_clean_buffers(MpegEncContext *s){
383
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
384
    s->last_dc[1] = s->last_dc[0];
385
    s->last_dc[2] = s->last_dc[0];
386
    memset(s->last_mv, 0, sizeof(s->last_mv));
387
}
388

    
389
#ifdef CONFIG_ENCODERS
390

    
391
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
392
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
393
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
394
    put_bits(&s->pb, 1, 0); /* slice extra information */
395
}
396

    
397
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
398
{
399
    mpeg1_encode_sequence_header(s);
400

    
401
    /* mpeg1 picture header */
402
    put_header(s, PICTURE_START_CODE);
403
    /* temporal reference */
404

    
405
    // RAL: s->picture_number instead of s->fake_picture_number
406
    put_bits(&s->pb, 10, (s->picture_number -
407
                          s->gop_picture_number) & 0x3ff);
408
    put_bits(&s->pb, 3, s->pict_type);
409

    
410
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
411
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
412

    
413
    // RAL: Forward f_code also needed for B frames
414
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
415
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
416
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
417
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
418
        else
419
            put_bits(&s->pb, 3, 7); /* forward_f_code */
420
    }
421

    
422
    // RAL: Backward f_code necessary for B frames
423
    if (s->pict_type == B_TYPE) {
424
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
425
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
426
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
427
        else
428
            put_bits(&s->pb, 3, 7); /* backward_f_code */
429
    }
430

    
431
    put_bits(&s->pb, 1, 0); /* extra bit picture */
432

    
433
    s->frame_pred_frame_dct = 1;
434
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
435
        put_header(s, EXT_START_CODE);
436
        put_bits(&s->pb, 4, 8); //pic ext
437
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
438
            put_bits(&s->pb, 4, s->f_code);
439
            put_bits(&s->pb, 4, s->f_code);
440
        }else{
441
            put_bits(&s->pb, 8, 255);
442
        }
443
        if (s->pict_type == B_TYPE) {
444
            put_bits(&s->pb, 4, s->b_code);
445
            put_bits(&s->pb, 4, s->b_code);
446
        }else{
447
            put_bits(&s->pb, 8, 255);
448
        }
449
        put_bits(&s->pb, 2, s->intra_dc_precision);
450

    
451
        assert(s->picture_structure == PICT_FRAME);
452
        put_bits(&s->pb, 2, s->picture_structure);
453
        if (s->progressive_sequence) {
454
            put_bits(&s->pb, 1, 0); /* no repeat */
455
        } else {
456
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
457
        }
458
        /* XXX: optimize the generation of this flag with entropy
459
           measures */
460
        s->frame_pred_frame_dct = s->progressive_sequence;
461

    
462
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
463
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
464
        put_bits(&s->pb, 1, s->q_scale_type);
465
        put_bits(&s->pb, 1, s->intra_vlc_format);
466
        put_bits(&s->pb, 1, s->alternate_scan);
467
        put_bits(&s->pb, 1, s->repeat_first_field);
468
        s->progressive_frame = s->progressive_sequence;
469
        put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
470
        put_bits(&s->pb, 1, s->progressive_frame);
471
        put_bits(&s->pb, 1, 0); //composite_display_flag
472
    }
473
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
474
        int i;
475

    
476
        put_header(s, USER_START_CODE);
477
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
478
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
479
        }
480
    }
481

    
482
    s->mb_y=0;
483
    ff_mpeg1_encode_slice_header(s);
484
}
485

    
486
static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
487
                                int has_mv, int field_motion)
488
{
489
    put_bits(&s->pb, n, bits);
490
    if (!s->frame_pred_frame_dct) {
491
        if (has_mv)
492
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
493
        put_bits(&s->pb, 1, s->interlaced_dct);
494
    }
495
}
496

    
497
static always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
498
                                                   DCTELEM block[6][64],
499
                                                   int motion_x, int motion_y,
500
                                                   int mb_block_count)
501
{
502
    int i, cbp;
503
    const int mb_x = s->mb_x;
504
    const int mb_y = s->mb_y;
505
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
506

    
507
    /* compute cbp */
508
    cbp = 0;
509
    for(i=0;i<mb_block_count;i++) {
510
        if (s->block_last_index[i] >= 0)
511
            cbp |= 1 << (mb_block_count - 1 - i);
512
    }
513

    
514
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
515
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
516
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
517
        (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) |
518
        ((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))) {
519
        s->mb_skip_run++;
520
        s->qscale -= s->dquant;
521
        s->skip_count++;
522
        s->misc_bits++;
523
        s->last_bits++;
524
        if(s->pict_type == P_TYPE){
525
            s->last_mv[0][1][0]= s->last_mv[0][0][0]=
526
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
527
        }
528
    } else {
529
        if(first_mb){
530
            assert(s->mb_skip_run == 0);
531
            encode_mb_skip_run(s, s->mb_x);
532
        }else{
533
            encode_mb_skip_run(s, s->mb_skip_run);
534
        }
535

    
536
        if (s->pict_type == I_TYPE) {
537
            if(s->dquant && cbp){
538
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
539
                put_bits(&s->pb, 5, s->qscale);
540
            }else{
541
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
542
                s->qscale -= s->dquant;
543
            }
544
            s->misc_bits+= get_bits_diff(s);
545
            s->i_count++;
546
        } else if (s->mb_intra) {
547
            if(s->dquant && cbp){
548
                put_mb_modes(s, 6, 0x01, 0, 0);
549
                put_bits(&s->pb, 5, s->qscale);
550
            }else{
551
                put_mb_modes(s, 5, 0x03, 0, 0);
552
                s->qscale -= s->dquant;
553
            }
554
            s->misc_bits+= get_bits_diff(s);
555
            s->i_count++;
556
            memset(s->last_mv, 0, sizeof(s->last_mv));
557
        } else if (s->pict_type == P_TYPE) {
558
            if(s->mv_type == MV_TYPE_16X16){
559
                if (cbp != 0) {
560
                    if ((motion_x|motion_y) == 0) {
561
                        if(s->dquant){
562
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
563
                            put_bits(&s->pb, 5, s->qscale);
564
                        }else{
565
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
566
                        }
567
                        s->misc_bits+= get_bits_diff(s);
568
                    } else {
569
                        if(s->dquant){
570
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
571
                            put_bits(&s->pb, 5, s->qscale);
572
                        }else{
573
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
574
                        }
575
                        s->misc_bits+= get_bits_diff(s);
576
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
577
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
578
                        s->mv_bits+= get_bits_diff(s);
579
                    }
580
                } else {
581
                    put_bits(&s->pb, 3, 1); /* motion only */
582
                    if (!s->frame_pred_frame_dct)
583
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
584
                    s->misc_bits+= get_bits_diff(s);
585
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
586
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
587
                    s->qscale -= s->dquant;
588
                    s->mv_bits+= get_bits_diff(s);
589
                }
590
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
591
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
592
            }else{
593
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
594

    
595
                if (cbp) {
596
                    if(s->dquant){
597
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
598
                        put_bits(&s->pb, 5, s->qscale);
599
                    }else{
600
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
601
                    }
602
                } else {
603
                    put_bits(&s->pb, 3, 1); /* motion only */
604
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
605
                    s->qscale -= s->dquant;
606
                }
607
                s->misc_bits+= get_bits_diff(s);
608
                for(i=0; i<2; i++){
609
                    put_bits(&s->pb, 1, s->field_select[0][i]);
610
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
611
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
612
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
613
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
614
                }
615
                s->mv_bits+= get_bits_diff(s);
616
            }
617
            if(cbp) {
618
                if (s->chroma_y_shift) {
619
                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
620
                } else {
621
                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
622
                    put_bits(&s->pb, 2, cbp & 3);
623
                }
624
            }
625
            s->f_count++;
626
        } else{
627
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
628

    
629
            if(s->mv_type == MV_TYPE_16X16){
630
                if (cbp){    // With coded bloc pattern
631
                    if (s->dquant) {
632
                        if(s->mv_dir == MV_DIR_FORWARD)
633
                            put_mb_modes(s, 6, 3, 1, 0);
634
                        else
635
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
636
                        put_bits(&s->pb, 5, s->qscale);
637
                    } else {
638
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
639
                    }
640
                }else{    // No coded bloc pattern
641
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
642
                    if (!s->frame_pred_frame_dct)
643
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
644
                    s->qscale -= s->dquant;
645
                }
646
                s->misc_bits += get_bits_diff(s);
647
                if (s->mv_dir&MV_DIR_FORWARD){
648
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
649
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
650
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
651
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
652
                    s->f_count++;
653
                }
654
                if (s->mv_dir&MV_DIR_BACKWARD){
655
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
656
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
657
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
658
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
659
                    s->b_count++;
660
                }
661
            }else{
662
                assert(s->mv_type == MV_TYPE_FIELD);
663
                assert(!s->frame_pred_frame_dct);
664
                if (cbp){    // With coded bloc pattern
665
                    if (s->dquant) {
666
                        if(s->mv_dir == MV_DIR_FORWARD)
667
                            put_mb_modes(s, 6, 3, 1, 1);
668
                        else
669
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
670
                        put_bits(&s->pb, 5, s->qscale);
671
                    } else {
672
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
673
                    }
674
                }else{    // No coded bloc pattern
675
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
676
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
677
                    s->qscale -= s->dquant;
678
                }
679
                s->misc_bits += get_bits_diff(s);
680
                if (s->mv_dir&MV_DIR_FORWARD){
681
                    for(i=0; i<2; i++){
682
                        put_bits(&s->pb, 1, s->field_select[0][i]);
683
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
684
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
685
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
686
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
687
                    }
688
                    s->f_count++;
689
                }
690
                if (s->mv_dir&MV_DIR_BACKWARD){
691
                    for(i=0; i<2; i++){
692
                        put_bits(&s->pb, 1, s->field_select[1][i]);
693
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
694
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
695
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
696
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
697
                    }
698
                    s->b_count++;
699
                }
700
            }
701
            s->mv_bits += get_bits_diff(s);
702
            if(cbp) {
703
                if (s->chroma_y_shift) {
704
                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
705
                } else {
706
                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
707
                    put_bits(&s->pb, 2, cbp & 3);
708
                }
709
            }
710
        }
711
        for(i=0;i<mb_block_count;i++) {
712
            if (cbp & (1 << (mb_block_count - 1 - i))) {
713
                mpeg1_encode_block(s, block[i], i);
714
            }
715
        }
716
        s->mb_skip_run = 0;
717
        if(s->mb_intra)
718
            s->i_tex_bits+= get_bits_diff(s);
719
        else
720
            s->p_tex_bits+= get_bits_diff(s);
721
    }
722
}
723

    
724
void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
725
{
726
    if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
727
    else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
728
}
729

    
730
// RAL: Parameter added: f_or_b_code
731
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
732
{
733
    int code, bit_size, l, bits, range, sign;
734

    
735
    if (val == 0) {
736
        /* zero vector */
737
        code = 0;
738
        put_bits(&s->pb,
739
                 mbMotionVectorTable[0][1],
740
                 mbMotionVectorTable[0][0]);
741
    } else {
742
        bit_size = f_or_b_code - 1;
743
        range = 1 << bit_size;
744
        /* modulo encoding */
745
        l= INT_BIT - 5 - bit_size;
746
        val= (val<<l)>>l;
747

    
748
        if (val >= 0) {
749
            val--;
750
            code = (val >> bit_size) + 1;
751
            bits = val & (range - 1);
752
            sign = 0;
753
        } else {
754
            val = -val;
755
            val--;
756
            code = (val >> bit_size) + 1;
757
            bits = val & (range - 1);
758
            sign = 1;
759
        }
760

    
761
        assert(code > 0 && code <= 16);
762

    
763
        put_bits(&s->pb,
764
                 mbMotionVectorTable[code][1],
765
                 mbMotionVectorTable[code][0]);
766

    
767
        put_bits(&s->pb, 1, sign);
768
        if (bit_size > 0) {
769
            put_bits(&s->pb, bit_size, bits);
770
        }
771
    }
772
}
773

    
774
void ff_mpeg1_encode_init(MpegEncContext *s)
775
{
776
    static int done=0;
777

    
778
    common_init(s);
779

    
780
    if(!done){
781
        int f_code;
782
        int mv;
783
        int i;
784

    
785
        done=1;
786
        init_rl(&rl_mpeg1, 1);
787
        if(s->intra_vlc_format)
788
            init_rl(&rl_mpeg2, 1);
789

    
790
        for(i=0; i<64; i++)
791
        {
792
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
793
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
794
        }
795

    
796
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
797
        if(s->intra_vlc_format)
798
            init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
799

    
800
        /* build unified dc encoding tables */
801
        for(i=-255; i<256; i++)
802
        {
803
                int adiff, index;
804
                int bits, code;
805
                int diff=i;
806

    
807
                adiff = ABS(diff);
808
                if(diff<0) diff--;
809
                index = av_log2(2*adiff);
810

    
811
                bits= vlc_dc_lum_bits[index] + index;
812
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
813
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
814

    
815
                bits= vlc_dc_chroma_bits[index] + index;
816
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
817
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
818
        }
819

    
820
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
821

    
822
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
823
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
824
                int len;
825

    
826
                if(mv==0) len= mbMotionVectorTable[0][1];
827
                else{
828
                    int val, bit_size, range, code;
829

    
830
                    bit_size = f_code - 1;
831
                    range = 1 << bit_size;
832

    
833
                    val=mv;
834
                    if (val < 0)
835
                        val = -val;
836
                    val--;
837
                    code = (val >> bit_size) + 1;
838
                    if(code<17){
839
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
840
                    }else{
841
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
842
                    }
843
                }
844

    
845
                mv_penalty[f_code][mv+MAX_MV]= len;
846
            }
847
        }
848

    
849

    
850
        for(f_code=MAX_FCODE; f_code>0; f_code--){
851
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
852
                fcode_tab[mv+MAX_MV]= f_code;
853
            }
854
        }
855
    }
856
    s->me.mv_penalty= mv_penalty;
857
    s->fcode_tab= fcode_tab;
858
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
859
        s->min_qcoeff=-255;
860
        s->max_qcoeff= 255;
861
    }else{
862
        s->min_qcoeff=-2047;
863
        s->max_qcoeff= 2047;
864
    }
865
    if (s->intra_vlc_format) {
866
        s->intra_ac_vlc_length=
867
        s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
868
    } else {
869
        s->intra_ac_vlc_length=
870
        s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
871
    }
872
    s->inter_ac_vlc_length=
873
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
874
}
875

    
876
static inline void encode_dc(MpegEncContext *s, int diff, int component)
877
{
878
  if(((unsigned) (diff+255)) >= 511){
879
        int index;
880

    
881
        if(diff<0){
882
            index= av_log2_16bit(-2*diff);
883
            diff--;
884
        }else{
885
            index= av_log2_16bit(2*diff);
886
        }
887
        if (component == 0) {
888
            put_bits(
889
                &s->pb,
890
                vlc_dc_lum_bits[index] + index,
891
                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
892
        }else{
893
            put_bits(
894
                &s->pb,
895
                vlc_dc_chroma_bits[index] + index,
896
                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
897
        }
898
  }else{
899
    if (component == 0) {
900
        put_bits(
901
            &s->pb,
902
            mpeg1_lum_dc_uni[diff+255]&0xFF,
903
            mpeg1_lum_dc_uni[diff+255]>>8);
904
    } else {
905
        put_bits(
906
            &s->pb,
907
            mpeg1_chr_dc_uni[diff+255]&0xFF,
908
            mpeg1_chr_dc_uni[diff+255]>>8);
909
    }
910
  }
911
}
912

    
913
static void mpeg1_encode_block(MpegEncContext *s,
914
                               DCTELEM *block,
915
                               int n)
916
{
917
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
918
    int code, component;
919
    const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
920

    
921
    last_index = s->block_last_index[n];
922

    
923
    /* DC coef */
924
    if (s->mb_intra) {
925
        component = (n <= 3 ? 0 : (n&1) + 1);
926
        dc = block[0]; /* overflow is impossible */
927
        diff = dc - s->last_dc[component];
928
        encode_dc(s, diff, component);
929
        s->last_dc[component] = dc;
930
        i = 1;
931
        if (s->intra_vlc_format)
932
            table_vlc = rl_mpeg2.table_vlc;
933
    } else {
934
        /* encode the first coefficient : needs to be done here because
935
           it is handled slightly differently */
936
        level = block[0];
937
        if (abs(level) == 1) {
938
                code = ((uint32_t)level >> 31); /* the sign bit */
939
                put_bits(&s->pb, 2, code | 0x02);
940
                i = 1;
941
        } else {
942
            i = 0;
943
            last_non_zero = -1;
944
            goto next_coef;
945
        }
946
    }
947

    
948
    /* now quantify & encode AC coefs */
949
    last_non_zero = i - 1;
950

    
951
    for(;i<=last_index;i++) {
952
        j = s->intra_scantable.permutated[i];
953
        level = block[j];
954
    next_coef:
955
#if 0
956
        if (level != 0)
957
            dprintf("level[%d]=%d\n", i, level);
958
#endif
959
        /* encode using VLC */
960
        if (level != 0) {
961
            run = i - last_non_zero - 1;
962

    
963
            alevel= level;
964
            MASK_ABS(sign, alevel)
965
            sign&=1;
966

    
967
            if (alevel <= mpeg1_max_level[0][run]){
968
                code= mpeg1_index_run[0][run] + alevel - 1;
969
                /* store the vlc & sign at once */
970
                put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
971
            } else {
972
                /* escape seems to be pretty rare <5% so i dont optimize it */
973
                put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
974
                /* escape: only clip in this case */
975
                put_bits(&s->pb, 6, run);
976
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
977
                    if (alevel < 128) {
978
                        put_bits(&s->pb, 8, level & 0xff);
979
                    } else {
980
                        if (level < 0) {
981
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
982
                        } else {
983
                            put_bits(&s->pb, 16, level & 0xffff);
984
                        }
985
                    }
986
                }else{
987
                    put_bits(&s->pb, 12, level & 0xfff);
988
                }
989
            }
990
            last_non_zero = i;
991
        }
992
    }
993
    /* end of block */
994
    put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
995
}
996
#endif //CONFIG_ENCODERS
997

    
998
/******************************************/
999
/* decoding */
1000

    
1001
static VLC dc_lum_vlc;
1002
static VLC dc_chroma_vlc;
1003
static VLC mv_vlc;
1004
static VLC mbincr_vlc;
1005
static VLC mb_ptype_vlc;
1006
static VLC mb_btype_vlc;
1007
static VLC mb_pat_vlc;
1008

    
1009
static void init_vlcs(void)
1010
{
1011
    static int done = 0;
1012

    
1013
    if (!done) {
1014
        done = 1;
1015

    
1016
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1017
                 vlc_dc_lum_bits, 1, 1,
1018
                 vlc_dc_lum_code, 2, 2, 1);
1019
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1020
                 vlc_dc_chroma_bits, 1, 1,
1021
                 vlc_dc_chroma_code, 2, 2, 1);
1022
        init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1023
                 &mbMotionVectorTable[0][1], 2, 1,
1024
                 &mbMotionVectorTable[0][0], 2, 1, 1);
1025
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1026
                 &mbAddrIncrTable[0][1], 2, 1,
1027
                 &mbAddrIncrTable[0][0], 2, 1, 1);
1028
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1029
                 &mbPatTable[0][1], 2, 1,
1030
                 &mbPatTable[0][0], 2, 1, 1);
1031

    
1032
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1033
                 &table_mb_ptype[0][1], 2, 1,
1034
                 &table_mb_ptype[0][0], 2, 1, 1);
1035
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1036
                 &table_mb_btype[0][1], 2, 1,
1037
                 &table_mb_btype[0][0], 2, 1, 1);
1038
        init_rl(&rl_mpeg1, 1);
1039
        init_rl(&rl_mpeg2, 1);
1040

    
1041
        init_2d_vlc_rl(&rl_mpeg1, 1);
1042
        init_2d_vlc_rl(&rl_mpeg2, 1);
1043
    }
1044
}
1045

    
1046
static inline int get_dmv(MpegEncContext *s)
1047
{
1048
    if(get_bits1(&s->gb))
1049
        return 1 - (get_bits1(&s->gb) << 1);
1050
    else
1051
        return 0;
1052
}
1053

    
1054
static inline int get_qscale(MpegEncContext *s)
1055
{
1056
    int qscale = get_bits(&s->gb, 5);
1057
    if (s->q_scale_type) {
1058
        return non_linear_qscale[qscale];
1059
    } else {
1060
        return qscale << 1;
1061
    }
1062
}
1063

    
1064
/* motion type (for mpeg2) */
1065
#define MT_FIELD 1
1066
#define MT_FRAME 2
1067
#define MT_16X8  2
1068
#define MT_DMV   3
1069

    
1070
static int mpeg_decode_mb(MpegEncContext *s,
1071
                          DCTELEM block[12][64])
1072
{
1073
    int i, j, k, cbp, val, mb_type, motion_type;
1074
    const int mb_block_count = 4 + (1<< s->chroma_format);
1075

    
1076
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1077

    
1078
    assert(s->mb_skipped==0);
1079

    
1080
    if (s->mb_skip_run-- != 0) {
1081
        if(s->pict_type == I_TYPE){
1082
            av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1083
            return -1;
1084
        }
1085

    
1086
        /* skip mb */
1087
        s->mb_intra = 0;
1088
        for(i=0;i<12;i++)
1089
            s->block_last_index[i] = -1;
1090
        if(s->picture_structure == PICT_FRAME)
1091
            s->mv_type = MV_TYPE_16X16;
1092
        else
1093
            s->mv_type = MV_TYPE_FIELD;
1094
        if (s->pict_type == P_TYPE) {
1095
            /* if P type, zero motion vector is implied */
1096
            s->mv_dir = MV_DIR_FORWARD;
1097
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1098
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1099
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1100
            s->field_select[0][0]= s->picture_structure - 1;
1101
            s->mb_skipped = 1;
1102
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1103
        } else {
1104
            int mb_type;
1105

    
1106
            if(s->mb_x)
1107
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1108
            else
1109
                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,
1110
            if(IS_INTRA(mb_type))
1111
                return -1;
1112

    
1113
            /* if B type, reuse previous vectors and directions */
1114
            s->mv[0][0][0] = s->last_mv[0][0][0];
1115
            s->mv[0][0][1] = s->last_mv[0][0][1];
1116
            s->mv[1][0][0] = s->last_mv[1][0][0];
1117
            s->mv[1][0][1] = s->last_mv[1][0][1];
1118

    
1119
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1120
                mb_type | MB_TYPE_SKIP;
1121
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1122

    
1123
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1124
                s->mb_skipped = 1;
1125
        }
1126

    
1127
        return 0;
1128
    }
1129

    
1130
    switch(s->pict_type) {
1131
    default:
1132
    case I_TYPE:
1133
        if (get_bits1(&s->gb) == 0) {
1134
            if (get_bits1(&s->gb) == 0){
1135
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1136
                return -1;
1137
            }
1138
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1139
        } else {
1140
            mb_type = MB_TYPE_INTRA;
1141
        }
1142
        break;
1143
    case P_TYPE:
1144
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1145
        if (mb_type < 0){
1146
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1147
            return -1;
1148
        }
1149
        mb_type = ptype2mb_type[ mb_type ];
1150
        break;
1151
    case B_TYPE:
1152
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1153
        if (mb_type < 0){
1154
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1155
            return -1;
1156
        }
1157
        mb_type = btype2mb_type[ mb_type ];
1158
        break;
1159
    }
1160
    dprintf("mb_type=%x\n", mb_type);
1161
//    motion_type = 0; /* avoid warning */
1162
    if (IS_INTRA(mb_type)) {
1163
        s->dsp.clear_blocks(s->block[0]);
1164

    
1165
        if(!s->chroma_y_shift){
1166
            s->dsp.clear_blocks(s->block[6]);
1167
        }
1168

    
1169
        /* compute dct type */
1170
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1171
            !s->frame_pred_frame_dct) {
1172
            s->interlaced_dct = get_bits1(&s->gb);
1173
        }
1174

    
1175
        if (IS_QUANT(mb_type))
1176
            s->qscale = get_qscale(s);
1177

    
1178
        if (s->concealment_motion_vectors) {
1179
            /* just parse them */
1180
            if (s->picture_structure != PICT_FRAME)
1181
                skip_bits1(&s->gb); /* field select */
1182

    
1183
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1184
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1185
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1186
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1187

    
1188
            skip_bits1(&s->gb); /* marker */
1189
        }else
1190
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1191
        s->mb_intra = 1;
1192
#ifdef HAVE_XVMC
1193
        //one 1 we memcpy blocks in xvmcvideo
1194
        if(s->avctx->xvmc_acceleration > 1){
1195
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1196
            if(s->swap_uv){
1197
                exchange_uv(s);
1198
            }
1199
        }
1200
#endif
1201

    
1202
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1203
            if(s->flags2 & CODEC_FLAG2_FAST){
1204
                for(i=0;i<6;i++) {
1205
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1206
                }
1207
            }else{
1208
                for(i=0;i<mb_block_count;i++) {
1209
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1210
                        return -1;
1211
                }
1212
            }
1213
        } else {
1214
            for(i=0;i<6;i++) {
1215
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1216
                    return -1;
1217
            }
1218
        }
1219
    } else {
1220
        if (mb_type & MB_TYPE_ZERO_MV){
1221
            assert(mb_type & MB_TYPE_CBP);
1222

    
1223
            /* compute dct type */
1224
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1225
                !s->frame_pred_frame_dct) {
1226
                s->interlaced_dct = get_bits1(&s->gb);
1227
            }
1228

    
1229
            if (IS_QUANT(mb_type))
1230
                s->qscale = get_qscale(s);
1231

    
1232
            s->mv_dir = MV_DIR_FORWARD;
1233
            if(s->picture_structure == PICT_FRAME)
1234
                s->mv_type = MV_TYPE_16X16;
1235
            else{
1236
                s->mv_type = MV_TYPE_FIELD;
1237
                mb_type |= MB_TYPE_INTERLACED;
1238
                s->field_select[0][0]= s->picture_structure - 1;
1239
            }
1240
            s->last_mv[0][0][0] = 0;
1241
            s->last_mv[0][0][1] = 0;
1242
            s->last_mv[0][1][0] = 0;
1243
            s->last_mv[0][1][1] = 0;
1244
            s->mv[0][0][0] = 0;
1245
            s->mv[0][0][1] = 0;
1246
        }else{
1247
            assert(mb_type & MB_TYPE_L0L1);
1248
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1249
            /* get additionnal motion vector type */
1250
            if (s->frame_pred_frame_dct)
1251
                motion_type = MT_FRAME;
1252
            else{
1253
                motion_type = get_bits(&s->gb, 2);
1254
            }
1255

    
1256
            /* compute dct type */
1257
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1258
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1259
                s->interlaced_dct = get_bits1(&s->gb);
1260
            }
1261

    
1262
            if (IS_QUANT(mb_type))
1263
                s->qscale = get_qscale(s);
1264

    
1265
            /* motion vectors */
1266
            s->mv_dir = 0;
1267
            for(i=0;i<2;i++) {
1268
                if (USES_LIST(mb_type, i)) {
1269
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1270
                    dprintf("motion_type=%d\n", motion_type);
1271
                    switch(motion_type) {
1272
                    case MT_FRAME: /* or MT_16X8 */
1273
                        if (s->picture_structure == PICT_FRAME) {
1274
                            /* MT_FRAME */
1275
                            mb_type |= MB_TYPE_16x16;
1276
                            s->mv_type = MV_TYPE_16X16;
1277
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1278
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1279
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1280
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1281
                            /* full_pel: only for mpeg1 */
1282
                            if (s->full_pel[i]){
1283
                                s->mv[i][0][0] <<= 1;
1284
                                s->mv[i][0][1] <<= 1;
1285
                            }
1286
                        } else {
1287
                            /* MT_16X8 */
1288
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1289
                            s->mv_type = MV_TYPE_16X8;
1290
                            for(j=0;j<2;j++) {
1291
                                s->field_select[i][j] = get_bits1(&s->gb);
1292
                                for(k=0;k<2;k++) {
1293
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1294
                                                             s->last_mv[i][j][k]);
1295
                                    s->last_mv[i][j][k] = val;
1296
                                    s->mv[i][j][k] = val;
1297
                                }
1298
                            }
1299
                        }
1300
                        break;
1301
                    case MT_FIELD:
1302
                        s->mv_type = MV_TYPE_FIELD;
1303
                        if (s->picture_structure == PICT_FRAME) {
1304
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1305
                            for(j=0;j<2;j++) {
1306
                                s->field_select[i][j] = get_bits1(&s->gb);
1307
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1308
                                                         s->last_mv[i][j][0]);
1309
                                s->last_mv[i][j][0] = val;
1310
                                s->mv[i][j][0] = val;
1311
                                dprintf("fmx=%d\n", val);
1312
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1313
                                                         s->last_mv[i][j][1] >> 1);
1314
                                s->last_mv[i][j][1] = val << 1;
1315
                                s->mv[i][j][1] = val;
1316
                                dprintf("fmy=%d\n", val);
1317
                            }
1318
                        } else {
1319
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1320
                            s->field_select[i][0] = get_bits1(&s->gb);
1321
                            for(k=0;k<2;k++) {
1322
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1323
                                                         s->last_mv[i][0][k]);
1324
                                s->last_mv[i][0][k] = val;
1325
                                s->last_mv[i][1][k] = val;
1326
                                s->mv[i][0][k] = val;
1327
                            }
1328
                        }
1329
                        break;
1330
                    case MT_DMV:
1331
                        {
1332
                            int dmx, dmy, mx, my, m;
1333

    
1334
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1335
                                                    s->last_mv[i][0][0]);
1336
                            s->last_mv[i][0][0] = mx;
1337
                            s->last_mv[i][1][0] = mx;
1338
                            dmx = get_dmv(s);
1339
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1340
                                                    s->last_mv[i][0][1] >> 1);
1341
                            dmy = get_dmv(s);
1342
                            s->mv_type = MV_TYPE_DMV;
1343

    
1344

    
1345
                            s->last_mv[i][0][1] = my<<1;
1346
                            s->last_mv[i][1][1] = my<<1;
1347

    
1348
                            s->mv[i][0][0] = mx;
1349
                            s->mv[i][0][1] = my;
1350
                            s->mv[i][1][0] = mx;//not used
1351
                            s->mv[i][1][1] = my;//not used
1352

    
1353
                            if (s->picture_structure == PICT_FRAME) {
1354
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1355

    
1356
                                //m = 1 + 2 * s->top_field_first;
1357
                                m = s->top_field_first ? 1 : 3;
1358

    
1359
                                /* top -> top pred */
1360
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1361
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1362
                                m = 4 - m;
1363
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1364
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1365
                            } else {
1366
                                mb_type |= MB_TYPE_16x16;
1367

    
1368
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1369
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1370
                                if(s->picture_structure == PICT_TOP_FIELD)
1371
                                    s->mv[i][2][1]--;
1372
                                else
1373
                                    s->mv[i][2][1]++;
1374
                            }
1375
                        }
1376
                        break;
1377
                    default:
1378
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1379
                        return -1;
1380
                    }
1381
                }
1382
            }
1383
        }
1384

    
1385
        s->mb_intra = 0;
1386
        if (HAS_CBP(mb_type)) {
1387
            s->dsp.clear_blocks(s->block[0]);
1388

    
1389
            if(!s->chroma_y_shift){
1390
                s->dsp.clear_blocks(s->block[6]);
1391
            }
1392

    
1393
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1394
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1395
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1396
                return -1;
1397
            }
1398
            if(mb_block_count > 6){
1399
                 cbp<<= mb_block_count-6;
1400
                 cbp |= get_bits(&s->gb, mb_block_count-6);
1401
            }
1402

    
1403
#ifdef HAVE_XVMC
1404
            //on 1 we memcpy blocks in xvmcvideo
1405
            if(s->avctx->xvmc_acceleration > 1){
1406
                XVMC_pack_pblocks(s,cbp);
1407
                if(s->swap_uv){
1408
                    exchange_uv(s);
1409
                }
1410
            }
1411
#endif
1412

    
1413
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1414
                if(s->flags2 & CODEC_FLAG2_FAST){
1415
                    for(i=0;i<6;i++) {
1416
                        if(cbp & 32) {
1417
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1418
                        } else {
1419
                            s->block_last_index[i] = -1;
1420
                        }
1421
                        cbp+=cbp;
1422
                    }
1423
                }else{
1424
                    cbp<<= 12-mb_block_count;
1425

    
1426
                    for(i=0;i<mb_block_count;i++) {
1427
                        if ( cbp & (1<<11) ) {
1428
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1429
                                return -1;
1430
                        } else {
1431
                            s->block_last_index[i] = -1;
1432
                        }
1433
                        cbp+=cbp;
1434
                    }
1435
                }
1436
            } else {
1437
                if(s->flags2 & CODEC_FLAG2_FAST){
1438
                    for(i=0;i<6;i++) {
1439
                        if (cbp & 32) {
1440
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1441
                        } else {
1442
                            s->block_last_index[i] = -1;
1443
                        }
1444
                        cbp+=cbp;
1445
                    }
1446
                }else{
1447
                    for(i=0;i<6;i++) {
1448
                        if (cbp & 32) {
1449
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1450
                                return -1;
1451
                        } else {
1452
                            s->block_last_index[i] = -1;
1453
                        }
1454
                        cbp+=cbp;
1455
                    }
1456
                }
1457
            }
1458
        }else{
1459
            for(i=0;i<12;i++)
1460
                s->block_last_index[i] = -1;
1461
        }
1462
    }
1463

    
1464
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1465

    
1466
    return 0;
1467
}
1468

    
1469
/* as h263, but only 17 codes */
1470
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1471
{
1472
    int code, sign, val, l, shift;
1473

    
1474
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1475
    if (code == 0) {
1476
        return pred;
1477
    }
1478
    if (code < 0) {
1479
        return 0xffff;
1480
    }
1481

    
1482
    sign = get_bits1(&s->gb);
1483
    shift = fcode - 1;
1484
    val = code;
1485
    if (shift) {
1486
        val = (val - 1) << shift;
1487
        val |= get_bits(&s->gb, shift);
1488
        val++;
1489
    }
1490
    if (sign)
1491
        val = -val;
1492
    val += pred;
1493

    
1494
    /* modulo decoding */
1495
    l= INT_BIT - 5 - shift;
1496
    val = (val<<l)>>l;
1497
    return val;
1498
}
1499

    
1500
static inline int decode_dc(GetBitContext *gb, int component)
1501
{
1502
    int code, diff;
1503

    
1504
    if (component == 0) {
1505
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1506
    } else {
1507
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1508
    }
1509
    if (code < 0){
1510
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1511
        return 0xffff;
1512
    }
1513
    if (code == 0) {
1514
        diff = 0;
1515
    } else {
1516
        diff = get_xbits(gb, code);
1517
    }
1518
    return diff;
1519
}
1520

    
1521
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1522
                               DCTELEM *block,
1523
                               int n)
1524
{
1525
    int level, dc, diff, i, j, run;
1526
    int component;
1527
    RLTable *rl = &rl_mpeg1;
1528
    uint8_t * const scantable= s->intra_scantable.permutated;
1529
    const uint16_t *quant_matrix= s->intra_matrix;
1530
    const int qscale= s->qscale;
1531

    
1532
    /* DC coef */
1533
    component = (n <= 3 ? 0 : n - 4 + 1);
1534
    diff = decode_dc(&s->gb, component);
1535
    if (diff >= 0xffff)
1536
        return -1;
1537
    dc = s->last_dc[component];
1538
    dc += diff;
1539
    s->last_dc[component] = dc;
1540
    block[0] = dc<<3;
1541
    dprintf("dc=%d diff=%d\n", dc, diff);
1542
    i = 0;
1543
    {
1544
        OPEN_READER(re, &s->gb);
1545
        /* now quantify & encode AC coefs */
1546
        for(;;) {
1547
            UPDATE_CACHE(re, &s->gb);
1548
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1549

    
1550
            if(level == 127){
1551
                break;
1552
            } else if(level != 0) {
1553
                i += run;
1554
                j = scantable[i];
1555
                level= (level*qscale*quant_matrix[j])>>4;
1556
                level= (level-1)|1;
1557
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1558
                LAST_SKIP_BITS(re, &s->gb, 1);
1559
            } else {
1560
                /* escape */
1561
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1562
                UPDATE_CACHE(re, &s->gb);
1563
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1564
                if (level == -128) {
1565
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1566
                } else if (level == 0) {
1567
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1568
                }
1569
                i += run;
1570
                j = scantable[i];
1571
                if(level<0){
1572
                    level= -level;
1573
                    level= (level*qscale*quant_matrix[j])>>4;
1574
                    level= (level-1)|1;
1575
                    level= -level;
1576
                }else{
1577
                    level= (level*qscale*quant_matrix[j])>>4;
1578
                    level= (level-1)|1;
1579
                }
1580
            }
1581
            if (i > 63){
1582
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1583
                return -1;
1584
            }
1585

    
1586
            block[j] = level;
1587
        }
1588
        CLOSE_READER(re, &s->gb);
1589
    }
1590
    s->block_last_index[n] = i;
1591
   return 0;
1592
}
1593

    
1594
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1595
                               DCTELEM *block,
1596
                               int n)
1597
{
1598
    int level, i, j, run;
1599
    RLTable *rl = &rl_mpeg1;
1600
    uint8_t * const scantable= s->intra_scantable.permutated;
1601
    const uint16_t *quant_matrix= s->inter_matrix;
1602
    const int qscale= s->qscale;
1603

    
1604
    {
1605
        OPEN_READER(re, &s->gb);
1606
        i = -1;
1607
        /* special case for the first coef. no need to add a second vlc table */
1608
        UPDATE_CACHE(re, &s->gb);
1609
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1610
            level= (3*qscale*quant_matrix[0])>>5;
1611
            level= (level-1)|1;
1612
            if(GET_CACHE(re, &s->gb)&0x40000000)
1613
                level= -level;
1614
            block[0] = level;
1615
            i++;
1616
            SKIP_BITS(re, &s->gb, 2);
1617
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1618
                goto end;
1619
        }
1620

    
1621
        /* now quantify & encode AC coefs */
1622
        for(;;) {
1623
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1624

    
1625
            if(level != 0) {
1626
                i += run;
1627
                j = scantable[i];
1628
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1629
                level= (level-1)|1;
1630
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1631
                SKIP_BITS(re, &s->gb, 1);
1632
            } else {
1633
                /* escape */
1634
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1635
                UPDATE_CACHE(re, &s->gb);
1636
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1637
                if (level == -128) {
1638
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1639
                } else if (level == 0) {
1640
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1641
                }
1642
                i += run;
1643
                j = scantable[i];
1644
                if(level<0){
1645
                    level= -level;
1646
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1647
                    level= (level-1)|1;
1648
                    level= -level;
1649
                }else{
1650
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1651
                    level= (level-1)|1;
1652
                }
1653
            }
1654
            if (i > 63){
1655
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1656
                return -1;
1657
            }
1658

    
1659
            block[j] = level;
1660
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1661
                break;
1662
            UPDATE_CACHE(re, &s->gb);
1663
        }
1664
end:
1665
        LAST_SKIP_BITS(re, &s->gb, 2);
1666
        CLOSE_READER(re, &s->gb);
1667
    }
1668
    s->block_last_index[n] = i;
1669
    return 0;
1670
}
1671

    
1672
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1673
{
1674
    int level, i, j, run;
1675
    RLTable *rl = &rl_mpeg1;
1676
    uint8_t * const scantable= s->intra_scantable.permutated;
1677
    const int qscale= s->qscale;
1678

    
1679
    {
1680
        OPEN_READER(re, &s->gb);
1681
        i = -1;
1682
        /* special case for the first coef. no need to add a second vlc table */
1683
        UPDATE_CACHE(re, &s->gb);
1684
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1685
            level= (3*qscale)>>1;
1686
            level= (level-1)|1;
1687
            if(GET_CACHE(re, &s->gb)&0x40000000)
1688
                level= -level;
1689
            block[0] = level;
1690
            i++;
1691
            SKIP_BITS(re, &s->gb, 2);
1692
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1693
                goto end;
1694
        }
1695

    
1696
        /* now quantify & encode AC coefs */
1697
        for(;;) {
1698
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1699

    
1700
            if(level != 0) {
1701
                i += run;
1702
                j = scantable[i];
1703
                level= ((level*2+1)*qscale)>>1;
1704
                level= (level-1)|1;
1705
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1706
                SKIP_BITS(re, &s->gb, 1);
1707
            } else {
1708
                /* escape */
1709
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1710
                UPDATE_CACHE(re, &s->gb);
1711
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1712
                if (level == -128) {
1713
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1714
                } else if (level == 0) {
1715
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1716
                }
1717
                i += run;
1718
                j = scantable[i];
1719
                if(level<0){
1720
                    level= -level;
1721
                    level= ((level*2+1)*qscale)>>1;
1722
                    level= (level-1)|1;
1723
                    level= -level;
1724
                }else{
1725
                    level= ((level*2+1)*qscale)>>1;
1726
                    level= (level-1)|1;
1727
                }
1728
            }
1729

    
1730
            block[j] = level;
1731
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1732
                break;
1733
            UPDATE_CACHE(re, &s->gb);
1734
        }
1735
end:
1736
        LAST_SKIP_BITS(re, &s->gb, 2);
1737
        CLOSE_READER(re, &s->gb);
1738
    }
1739
    s->block_last_index[n] = i;
1740
    return 0;
1741
}
1742

    
1743

    
1744
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1745
                               DCTELEM *block,
1746
                               int n)
1747
{
1748
    int level, i, j, run;
1749
    RLTable *rl = &rl_mpeg1;
1750
    uint8_t * const scantable= s->intra_scantable.permutated;
1751
    const uint16_t *quant_matrix;
1752
    const int qscale= s->qscale;
1753
    int mismatch;
1754

    
1755
    mismatch = 1;
1756

    
1757
    {
1758
        OPEN_READER(re, &s->gb);
1759
        i = -1;
1760
        if (n < 4)
1761
            quant_matrix = s->inter_matrix;
1762
        else
1763
            quant_matrix = s->chroma_inter_matrix;
1764

    
1765
        /* special case for the first coef. no need to add a second vlc table */
1766
        UPDATE_CACHE(re, &s->gb);
1767
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1768
            level= (3*qscale*quant_matrix[0])>>5;
1769
            if(GET_CACHE(re, &s->gb)&0x40000000)
1770
                level= -level;
1771
            block[0] = level;
1772
            mismatch ^= level;
1773
            i++;
1774
            SKIP_BITS(re, &s->gb, 2);
1775
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1776
                goto end;
1777
        }
1778

    
1779
        /* now quantify & encode AC coefs */
1780
        for(;;) {
1781
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1782

    
1783
            if(level != 0) {
1784
                i += run;
1785
                j = scantable[i];
1786
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1787
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1788
                SKIP_BITS(re, &s->gb, 1);
1789
            } else {
1790
                /* escape */
1791
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1792
                UPDATE_CACHE(re, &s->gb);
1793
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1794

    
1795
                i += run;
1796
                j = scantable[i];
1797
                if(level<0){
1798
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1799
                    level= -level;
1800
                }else{
1801
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1802
                }
1803
            }
1804
            if (i > 63){
1805
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1806
                return -1;
1807
            }
1808

    
1809
            mismatch ^= level;
1810
            block[j] = level;
1811
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1812
                break;
1813
            UPDATE_CACHE(re, &s->gb);
1814
        }
1815
end:
1816
        LAST_SKIP_BITS(re, &s->gb, 2);
1817
        CLOSE_READER(re, &s->gb);
1818
    }
1819
    block[63] ^= (mismatch & 1);
1820

    
1821
    s->block_last_index[n] = i;
1822
    return 0;
1823
}
1824

    
1825
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1826
                               DCTELEM *block,
1827
                               int n)
1828
{
1829
    int level, i, j, run;
1830
    RLTable *rl = &rl_mpeg1;
1831
    uint8_t * const scantable= s->intra_scantable.permutated;
1832
    const int qscale= s->qscale;
1833
    OPEN_READER(re, &s->gb);
1834
    i = -1;
1835

    
1836
    /* special case for the first coef. no need to add a second vlc table */
1837
    UPDATE_CACHE(re, &s->gb);
1838
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1839
        level= (3*qscale)>>1;
1840
        if(GET_CACHE(re, &s->gb)&0x40000000)
1841
            level= -level;
1842
        block[0] = level;
1843
        i++;
1844
        SKIP_BITS(re, &s->gb, 2);
1845
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1846
            goto end;
1847
    }
1848

    
1849
    /* now quantify & encode AC coefs */
1850
    for(;;) {
1851
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1852

    
1853
        if(level != 0) {
1854
            i += run;
1855
            j = scantable[i];
1856
            level= ((level*2+1)*qscale)>>1;
1857
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1858
            SKIP_BITS(re, &s->gb, 1);
1859
        } else {
1860
            /* escape */
1861
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1862
            UPDATE_CACHE(re, &s->gb);
1863
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1864

    
1865
            i += run;
1866
            j = scantable[i];
1867
            if(level<0){
1868
                level= ((-level*2+1)*qscale)>>1;
1869
                level= -level;
1870
            }else{
1871
                level= ((level*2+1)*qscale)>>1;
1872
            }
1873
        }
1874

    
1875
        block[j] = level;
1876
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1877
            break;
1878
        UPDATE_CACHE(re, &s->gb);
1879
    }
1880
end:
1881
    LAST_SKIP_BITS(re, &s->gb, 2);
1882
    CLOSE_READER(re, &s->gb);
1883
    s->block_last_index[n] = i;
1884
    return 0;
1885
}
1886

    
1887

    
1888
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1889
                               DCTELEM *block,
1890
                               int n)
1891
{
1892
    int level, dc, diff, i, j, run;
1893
    int component;
1894
    RLTable *rl;
1895
    uint8_t * const scantable= s->intra_scantable.permutated;
1896
    const uint16_t *quant_matrix;
1897
    const int qscale= s->qscale;
1898
    int mismatch;
1899

    
1900
    /* DC coef */
1901
    if (n < 4){
1902
        quant_matrix = s->intra_matrix;
1903
        component = 0;
1904
    }else{
1905
        quant_matrix = s->chroma_intra_matrix;
1906
        component = (n&1) + 1;
1907
    }
1908
    diff = decode_dc(&s->gb, component);
1909
    if (diff >= 0xffff)
1910
        return -1;
1911
    dc = s->last_dc[component];
1912
    dc += diff;
1913
    s->last_dc[component] = dc;
1914
    block[0] = dc << (3 - s->intra_dc_precision);
1915
    dprintf("dc=%d\n", block[0]);
1916
    mismatch = block[0] ^ 1;
1917
    i = 0;
1918
    if (s->intra_vlc_format)
1919
        rl = &rl_mpeg2;
1920
    else
1921
        rl = &rl_mpeg1;
1922

    
1923
    {
1924
        OPEN_READER(re, &s->gb);
1925
        /* now quantify & encode AC coefs */
1926
        for(;;) {
1927
            UPDATE_CACHE(re, &s->gb);
1928
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1929

    
1930
            if(level == 127){
1931
                break;
1932
            } else if(level != 0) {
1933
                i += run;
1934
                j = scantable[i];
1935
                level= (level*qscale*quant_matrix[j])>>4;
1936
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1937
                LAST_SKIP_BITS(re, &s->gb, 1);
1938
            } else {
1939
                /* escape */
1940
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1941
                UPDATE_CACHE(re, &s->gb);
1942
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1943
                i += run;
1944
                j = scantable[i];
1945
                if(level<0){
1946
                    level= (-level*qscale*quant_matrix[j])>>4;
1947
                    level= -level;
1948
                }else{
1949
                    level= (level*qscale*quant_matrix[j])>>4;
1950
                }
1951
            }
1952
            if (i > 63){
1953
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1954
                return -1;
1955
            }
1956

    
1957
            mismatch^= level;
1958
            block[j] = level;
1959
        }
1960
        CLOSE_READER(re, &s->gb);
1961
    }
1962
    block[63]^= mismatch&1;
1963

    
1964
    s->block_last_index[n] = i;
1965
    return 0;
1966
}
1967

    
1968
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1969
                               DCTELEM *block,
1970
                               int n)
1971
{
1972
    int level, dc, diff, j, run;
1973
    int component;
1974
    RLTable *rl;
1975
    uint8_t * scantable= s->intra_scantable.permutated;
1976
    const uint16_t *quant_matrix;
1977
    const int qscale= s->qscale;
1978

    
1979
    /* DC coef */
1980
    if (n < 4){
1981
        quant_matrix = s->intra_matrix;
1982
        component = 0;
1983
    }else{
1984
        quant_matrix = s->chroma_intra_matrix;
1985
        component = (n&1) + 1;
1986
    }
1987
    diff = decode_dc(&s->gb, component);
1988
    if (diff >= 0xffff)
1989
        return -1;
1990
    dc = s->last_dc[component];
1991
    dc += diff;
1992
    s->last_dc[component] = dc;
1993
    block[0] = dc << (3 - s->intra_dc_precision);
1994
    if (s->intra_vlc_format)
1995
        rl = &rl_mpeg2;
1996
    else
1997
        rl = &rl_mpeg1;
1998

    
1999
    {
2000
        OPEN_READER(re, &s->gb);
2001
        /* now quantify & encode AC coefs */
2002
        for(;;) {
2003
            UPDATE_CACHE(re, &s->gb);
2004
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2005

    
2006
            if(level == 127){
2007
                break;
2008
            } else if(level != 0) {
2009
                scantable += run;
2010
                j = *scantable;
2011
                level= (level*qscale*quant_matrix[j])>>4;
2012
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2013
                LAST_SKIP_BITS(re, &s->gb, 1);
2014
            } else {
2015
                /* escape */
2016
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2017
                UPDATE_CACHE(re, &s->gb);
2018
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2019
                scantable += run;
2020
                j = *scantable;
2021
                if(level<0){
2022
                    level= (-level*qscale*quant_matrix[j])>>4;
2023
                    level= -level;
2024
                }else{
2025
                    level= (level*qscale*quant_matrix[j])>>4;
2026
                }
2027
            }
2028

    
2029
            block[j] = level;
2030
        }
2031
        CLOSE_READER(re, &s->gb);
2032
    }
2033

    
2034
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2035
    return 0;
2036
}
2037

    
2038
typedef struct Mpeg1Context {
2039
    MpegEncContext mpeg_enc_ctx;
2040
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2041
    int repeat_field; /* true if we must repeat the field */
2042
    AVPanScan pan_scan; /** some temporary storage for the panscan */
2043
    int slice_count;
2044
    int swap_uv;//indicate VCR2
2045
    int save_aspect_info;
2046
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2047

    
2048
} Mpeg1Context;
2049

    
2050
static int mpeg_decode_init(AVCodecContext *avctx)
2051
{
2052
    Mpeg1Context *s = avctx->priv_data;
2053
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2054
    int i;
2055

    
2056
    //we need some parmutation to store
2057
    //matrixes, until MPV_common_init()
2058
    //set the real permutatuon
2059
    for(i=0;i<64;i++)
2060
       s2->dsp.idct_permutation[i]=i;
2061

    
2062
    MPV_decode_defaults(s2);
2063

    
2064
    s->mpeg_enc_ctx.avctx= avctx;
2065
    s->mpeg_enc_ctx.flags= avctx->flags;
2066
    s->mpeg_enc_ctx.flags2= avctx->flags2;
2067
    common_init(&s->mpeg_enc_ctx);
2068
    init_vlcs();
2069

    
2070
    s->mpeg_enc_ctx_allocated = 0;
2071
    s->mpeg_enc_ctx.picture_number = 0;
2072
    s->repeat_field = 0;
2073
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2074
    return 0;
2075
}
2076

    
2077
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2078
                                     const uint8_t *new_perm){
2079
    uint16_t temp_matrix[64];
2080
    int i;
2081

    
2082
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2083

    
2084
    for(i=0;i<64;i++){
2085
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2086
    }
2087
}
2088

    
2089
//Call this function when we know all parameters
2090
//it may be called in different places for mpeg1 and mpeg2
2091
static int mpeg_decode_postinit(AVCodecContext *avctx){
2092
    Mpeg1Context *s1 = avctx->priv_data;
2093
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2094
    uint8_t old_permutation[64];
2095

    
2096
    if (
2097
        (s1->mpeg_enc_ctx_allocated == 0)||
2098
        avctx->coded_width  != s->width ||
2099
        avctx->coded_height != s->height||
2100
        s1->save_aspect_info != s->aspect_ratio_info||
2101
        0)
2102
    {
2103

    
2104
        if (s1->mpeg_enc_ctx_allocated) {
2105
            ParseContext pc= s->parse_context;
2106
            s->parse_context.buffer=0;
2107
            MPV_common_end(s);
2108
            s->parse_context= pc;
2109
        }
2110

    
2111
        if( (s->width == 0 )||(s->height == 0))
2112
            return -2;
2113

    
2114
        avcodec_set_dimensions(avctx, s->width, s->height);
2115
        avctx->bit_rate = s->bit_rate;
2116
        s1->save_aspect_info = s->aspect_ratio_info;
2117

    
2118
     //low_delay may be forced, in this case we will have B frames
2119
     //that behave like P frames
2120
        avctx->has_b_frames = !(s->low_delay);
2121

    
2122
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2123
            //mpeg1 fps
2124
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2125
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2126
            //mpeg1 aspect
2127
            avctx->sample_aspect_ratio= av_d2q(
2128
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2129

    
2130
        }else{//mpeg2
2131
        //mpeg2 fps
2132
            av_reduce(
2133
                &s->avctx->time_base.den,
2134
                &s->avctx->time_base.num,
2135
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2136
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2137
                1<<30);
2138
        //mpeg2 aspect
2139
            if(s->aspect_ratio_info > 1){
2140
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2141
                    s->avctx->sample_aspect_ratio=
2142
                        av_div_q(
2143
                         mpeg2_aspect[s->aspect_ratio_info],
2144
                         (AVRational){s->width, s->height}
2145
                         );
2146
                }else{
2147
                    s->avctx->sample_aspect_ratio=
2148
                        av_div_q(
2149
                         mpeg2_aspect[s->aspect_ratio_info],
2150
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2151
                        );
2152
                }
2153
            }else{
2154
                s->avctx->sample_aspect_ratio=
2155
                    mpeg2_aspect[s->aspect_ratio_info];
2156
            }
2157
        }//mpeg2
2158

    
2159
        if(avctx->xvmc_acceleration){
2160
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2161
        }else{
2162
            if(s->chroma_format <  2){
2163
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2164
            }else
2165
            if(s->chroma_format == 2){
2166
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2167
            }else
2168
            if(s->chroma_format >  2){
2169
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2170
            }
2171
        }
2172
        //until then pix_fmt may be changed right after codec init
2173
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2174
            if( avctx->idct_algo == FF_IDCT_AUTO )
2175
                avctx->idct_algo = FF_IDCT_SIMPLE;
2176

    
2177
        //quantization matrixes may need reordering
2178
        //if dct permutation is changed
2179
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2180

    
2181
        if (MPV_common_init(s) < 0)
2182
            return -2;
2183

    
2184
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2185
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2186
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2187
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2188

    
2189
        s1->mpeg_enc_ctx_allocated = 1;
2190
    }
2191
    return 0;
2192
}
2193

    
2194
static int mpeg1_decode_picture(AVCodecContext *avctx,
2195
                                const uint8_t *buf, int buf_size)
2196
{
2197
    Mpeg1Context *s1 = avctx->priv_data;
2198
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2199
    int ref, f_code, vbv_delay;
2200

    
2201
    if(mpeg_decode_postinit(s->avctx) < 0)
2202
       return -2;
2203

    
2204
    init_get_bits(&s->gb, buf, buf_size*8);
2205

    
2206
    ref = get_bits(&s->gb, 10); /* temporal ref */
2207
    s->pict_type = get_bits(&s->gb, 3);
2208
    if(s->pict_type == 0 || s->pict_type > 3)
2209
        return -1;
2210

    
2211
    vbv_delay= get_bits(&s->gb, 16);
2212
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2213
        s->full_pel[0] = get_bits1(&s->gb);
2214
        f_code = get_bits(&s->gb, 3);
2215
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2216
            return -1;
2217
        s->mpeg_f_code[0][0] = f_code;
2218
        s->mpeg_f_code[0][1] = f_code;
2219
    }
2220
    if (s->pict_type == B_TYPE) {
2221
        s->full_pel[1] = get_bits1(&s->gb);
2222
        f_code = get_bits(&s->gb, 3);
2223
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2224
            return -1;
2225
        s->mpeg_f_code[1][0] = f_code;
2226
        s->mpeg_f_code[1][1] = f_code;
2227
    }
2228
    s->current_picture.pict_type= s->pict_type;
2229
    s->current_picture.key_frame= s->pict_type == I_TYPE;
2230

    
2231
    if(avctx->debug & FF_DEBUG_PICT_INFO)
2232
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2233

    
2234
    s->y_dc_scale = 8;
2235
    s->c_dc_scale = 8;
2236
    s->first_slice = 1;
2237
    return 0;
2238
}
2239

    
2240
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2241
{
2242
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2243
    int horiz_size_ext, vert_size_ext;
2244
    int bit_rate_ext;
2245

    
2246
    skip_bits(&s->gb, 1); /* profil and level esc*/
2247
    s->avctx->profile= get_bits(&s->gb, 3);
2248
    s->avctx->level= get_bits(&s->gb, 4);
2249
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2250
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2251
    horiz_size_ext = get_bits(&s->gb, 2);
2252
    vert_size_ext = get_bits(&s->gb, 2);
2253
    s->width |= (horiz_size_ext << 12);
2254
    s->height |= (vert_size_ext << 12);
2255
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2256
    s->bit_rate += (bit_rate_ext << 18) * 400;
2257
    skip_bits1(&s->gb); /* marker */
2258
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2259

    
2260
    s->low_delay = get_bits1(&s->gb);
2261
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2262

    
2263
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2264
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2265

    
2266
    dprintf("sequence extension\n");
2267
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2268
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
2269

    
2270
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2271
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2272
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2273

    
2274
}
2275

    
2276
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2277
{
2278
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2279
    int color_description, w, h;
2280

    
2281
    skip_bits(&s->gb, 3); /* video format */
2282
    color_description= get_bits1(&s->gb);
2283
    if(color_description){
2284
        skip_bits(&s->gb, 8); /* color primaries */
2285
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2286
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2287
    }
2288
    w= get_bits(&s->gb, 14);
2289
    skip_bits(&s->gb, 1); //marker
2290
    h= get_bits(&s->gb, 14);
2291
    skip_bits(&s->gb, 1); //marker
2292

    
2293
    s1->pan_scan.width= 16*w;
2294
    s1->pan_scan.height=16*h;
2295

    
2296
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2297
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2298
}
2299

    
2300
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2301
{
2302
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2303
    int i,nofco;
2304

    
2305
    nofco = 1;
2306
    if(s->progressive_sequence){
2307
        if(s->repeat_first_field){
2308
            nofco++;
2309
            if(s->top_field_first)
2310
                nofco++;
2311
        }
2312
    }else{
2313
        if(s->picture_structure == PICT_FRAME){
2314
            nofco++;
2315
            if(s->repeat_first_field)
2316
                nofco++;
2317
        }
2318
    }
2319
    for(i=0; i<nofco; i++){
2320
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2321
        skip_bits(&s->gb, 1); //marker
2322
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2323
        skip_bits(&s->gb, 1); //marker
2324
    }
2325

    
2326
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2327
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2328
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2329
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2330
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2331
        );
2332
}
2333

    
2334
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2335
{
2336
    int i, v, j;
2337

    
2338
    dprintf("matrix extension\n");
2339

    
2340
    if (get_bits1(&s->gb)) {
2341
        for(i=0;i<64;i++) {
2342
            v = get_bits(&s->gb, 8);
2343
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2344
            s->intra_matrix[j] = v;
2345
            s->chroma_intra_matrix[j] = v;
2346
        }
2347
    }
2348
    if (get_bits1(&s->gb)) {
2349
        for(i=0;i<64;i++) {
2350
            v = get_bits(&s->gb, 8);
2351
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2352
            s->inter_matrix[j] = v;
2353
            s->chroma_inter_matrix[j] = v;
2354
        }
2355
    }
2356
    if (get_bits1(&s->gb)) {
2357
        for(i=0;i<64;i++) {
2358
            v = get_bits(&s->gb, 8);
2359
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2360
            s->chroma_intra_matrix[j] = v;
2361
        }
2362
    }
2363
    if (get_bits1(&s->gb)) {
2364
        for(i=0;i<64;i++) {
2365
            v = get_bits(&s->gb, 8);
2366
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2367
            s->chroma_inter_matrix[j] = v;
2368
        }
2369
    }
2370
}
2371

    
2372
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2373
{
2374
    s->full_pel[0] = s->full_pel[1] = 0;
2375
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2376
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2377
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2378
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2379
    s->intra_dc_precision = get_bits(&s->gb, 2);
2380
    s->picture_structure = get_bits(&s->gb, 2);
2381
    s->top_field_first = get_bits1(&s->gb);
2382
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2383
    s->concealment_motion_vectors = get_bits1(&s->gb);
2384
    s->q_scale_type = get_bits1(&s->gb);
2385
    s->intra_vlc_format = get_bits1(&s->gb);
2386
    s->alternate_scan = get_bits1(&s->gb);
2387
    s->repeat_first_field = get_bits1(&s->gb);
2388
    s->chroma_420_type = get_bits1(&s->gb);
2389
    s->progressive_frame = get_bits1(&s->gb);
2390

    
2391
    if(s->picture_structure == PICT_FRAME)
2392
        s->first_field=0;
2393
    else{
2394
        s->first_field ^= 1;
2395
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2396
    }
2397

    
2398
    if(s->alternate_scan){
2399
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2400
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2401
    }else{
2402
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2403
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2404
    }
2405

    
2406
    /* composite display not parsed */
2407
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2408
    dprintf("picture_structure=%d\n", s->picture_structure);
2409
    dprintf("top field first=%d\n", s->top_field_first);
2410
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2411
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2412
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2413
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2414
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2415
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2416
}
2417

    
2418
static void mpeg_decode_extension(AVCodecContext *avctx,
2419
                                  const uint8_t *buf, int buf_size)
2420
{
2421
    Mpeg1Context *s1 = avctx->priv_data;
2422
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2423
    int ext_type;
2424

    
2425
    init_get_bits(&s->gb, buf, buf_size*8);
2426

    
2427
    ext_type = get_bits(&s->gb, 4);
2428
    switch(ext_type) {
2429
    case 0x1:
2430
        mpeg_decode_sequence_extension(s1);
2431
        break;
2432
    case 0x2:
2433
        mpeg_decode_sequence_display_extension(s1);
2434
        break;
2435
    case 0x3:
2436
        mpeg_decode_quant_matrix_extension(s);
2437
        break;
2438
    case 0x7:
2439
        mpeg_decode_picture_display_extension(s1);
2440
        break;
2441
    case 0x8:
2442
        mpeg_decode_picture_coding_extension(s);
2443
        break;
2444
    }
2445
}
2446

    
2447
static void exchange_uv(MpegEncContext *s){
2448
    short * tmp = s->pblocks[4];
2449
    s->pblocks[4] = s->pblocks[5];
2450
    s->pblocks[5] = tmp;
2451
}
2452

    
2453
static int mpeg_field_start(MpegEncContext *s){
2454
    AVCodecContext *avctx= s->avctx;
2455
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2456

    
2457
    /* start frame decoding */
2458
    if(s->first_field || s->picture_structure==PICT_FRAME){
2459
        if(MPV_frame_start(s, avctx) < 0)
2460
            return -1;
2461

    
2462
        ff_er_frame_start(s);
2463

    
2464
        /* first check if we must repeat the frame */
2465
        s->current_picture_ptr->repeat_pict = 0;
2466
        if (s->repeat_first_field) {
2467
            if (s->progressive_sequence) {
2468
                if (s->top_field_first)
2469
                    s->current_picture_ptr->repeat_pict = 4;
2470
                else
2471
                    s->current_picture_ptr->repeat_pict = 2;
2472
            } else if (s->progressive_frame) {
2473
                s->current_picture_ptr->repeat_pict = 1;
2474
            }
2475
        }
2476

    
2477
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2478
    }else{ //second field
2479
            int i;
2480

    
2481
            if(!s->current_picture_ptr){
2482
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2483
                return -1;
2484
            }
2485

    
2486
            for(i=0; i<4; i++){
2487
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2488
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2489
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2490
                }
2491
            }
2492
    }
2493
#ifdef HAVE_XVMC
2494
// MPV_frame_start will call this function too,
2495
// but we need to call it on every field
2496
    if(s->avctx->xvmc_acceleration)
2497
         XVMC_field_start(s,avctx);
2498
#endif
2499

    
2500
    return 0;
2501
}
2502

    
2503
#define DECODE_SLICE_ERROR -1
2504
#define DECODE_SLICE_OK 0
2505

    
2506
/**
2507
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2508
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2509
 *         DECODE_SLICE_OK if this slice is ok<br>
2510
 */
2511
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2512
                             const uint8_t **buf, int buf_size)
2513
{
2514
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2515
    AVCodecContext *avctx= s->avctx;
2516
    int ret;
2517
    const int field_pic= s->picture_structure != PICT_FRAME;
2518
    const int lowres= s->avctx->lowres;
2519

    
2520
    s->resync_mb_x=
2521
    s->resync_mb_y= -1;
2522

    
2523
    if (mb_y<<field_pic >= s->mb_height){
2524
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2525
        return -1;
2526
    }
2527

    
2528
    init_get_bits(&s->gb, *buf, buf_size*8);
2529

    
2530
    ff_mpeg1_clean_buffers(s);
2531
    s->interlaced_dct = 0;
2532

    
2533
    s->qscale = get_qscale(s);
2534

    
2535
    if(s->qscale == 0){
2536
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2537
        return -1;
2538
    }
2539

    
2540
    /* extra slice info */
2541
    while (get_bits1(&s->gb) != 0) {
2542
        skip_bits(&s->gb, 8);
2543
    }
2544

    
2545
    s->mb_x=0;
2546

    
2547
    for(;;) {
2548
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2549
        if (code < 0){
2550
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2551
            return -1;
2552
        }
2553
        if (code >= 33) {
2554
            if (code == 33) {
2555
                s->mb_x += 33;
2556
            }
2557
            /* otherwise, stuffing, nothing to do */
2558
        } else {
2559
            s->mb_x += code;
2560
            break;
2561
        }
2562
    }
2563

    
2564
    s->resync_mb_x= s->mb_x;
2565
    s->resync_mb_y= s->mb_y= mb_y;
2566
    s->mb_skip_run= 0;
2567
    ff_init_block_index(s);
2568

    
2569
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2570
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2571
             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",
2572
                 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],
2573
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2574
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2575
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2576
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2577
        }
2578
    }
2579

    
2580
    for(;;) {
2581
#ifdef HAVE_XVMC
2582
        //one 1 we memcpy blocks in xvmcvideo
2583
        if(s->avctx->xvmc_acceleration > 1)
2584
            XVMC_init_block(s);//set s->block
2585
#endif
2586

    
2587
        ret = mpeg_decode_mb(s, s->block);
2588
        s->chroma_qscale= s->qscale;
2589

    
2590
        dprintf("ret=%d\n", ret);
2591
        if (ret < 0)
2592
            return -1;
2593

    
2594
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2595
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2596
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2597
            int motion_x, motion_y, dir, i;
2598
            if(field_pic && !s->first_field)
2599
                xy += wrap/2;
2600

    
2601
            for(i=0; i<2; i++){
2602
                for(dir=0; dir<2; dir++){
2603
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2604
                        motion_x = motion_y = 0;
2605
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2606
                        motion_x = s->mv[dir][0][0];
2607
                        motion_y = s->mv[dir][0][1];
2608
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2609
                        motion_x = s->mv[dir][i][0];
2610
                        motion_y = s->mv[dir][i][1];
2611
                    }
2612

    
2613
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2614
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2615
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2616
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2617
                    s->current_picture.ref_index [dir][xy    ]=
2618
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2619
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2620
                }
2621
                xy += wrap;
2622
            }
2623
        }
2624

    
2625
        s->dest[0] += 16 >> lowres;
2626
        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2627
        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2628

    
2629
        MPV_decode_mb(s, s->block);
2630

    
2631
        if (++s->mb_x >= s->mb_width) {
2632
            const int mb_size= 16>>s->avctx->lowres;
2633

    
2634
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2635

    
2636
            s->mb_x = 0;
2637
            s->mb_y++;
2638

    
2639
            if(s->mb_y<<field_pic >= s->mb_height){
2640
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2641
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2642
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2643
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2644

    
2645
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2646
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2647
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2648
                    return -1;
2649
                }else
2650
                    goto eos;
2651
            }
2652

    
2653
            ff_init_block_index(s);
2654
        }
2655

    
2656
        /* skip mb handling */
2657
        if (s->mb_skip_run == -1) {
2658
            /* read again increment */
2659
            s->mb_skip_run = 0;
2660
            for(;;) {
2661
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2662
                if (code < 0){
2663
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2664
                    return -1;
2665
                }
2666
                if (code >= 33) {
2667
                    if (code == 33) {
2668
                        s->mb_skip_run += 33;
2669
                    }else if(code == 35){
2670
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2671
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2672
                            return -1;
2673
                        }
2674
                        goto eos; /* end of slice */
2675
                    }
2676
                    /* otherwise, stuffing, nothing to do */
2677
                } else {
2678
                    s->mb_skip_run += code;
2679
                    break;
2680
                }
2681
            }
2682
        }
2683
    }
2684
eos: // end of slice
2685
    *buf += get_bits_count(&s->gb)/8 - 1;
2686
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2687
    return 0;
2688
}
2689

    
2690
static int slice_decode_thread(AVCodecContext *c, void *arg){
2691
    MpegEncContext *s= arg;
2692
    const uint8_t *buf= s->gb.buffer;
2693
    int mb_y= s->start_mb_y;
2694

    
2695
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2696

    
2697
    for(;;){
2698
        int start_code, ret;
2699

    
2700
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2701
        emms_c();
2702
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2703
//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);
2704
        if(ret < 0){
2705
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2706
                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);
2707
        }else{
2708
            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);
2709
        }
2710

    
2711
        if(s->mb_y == s->end_mb_y)
2712
            return 0;
2713

    
2714
        start_code= -1;
2715
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2716
        mb_y= start_code - SLICE_MIN_START_CODE;
2717
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2718
            return -1;
2719
    }
2720

    
2721
    return 0; //not reached
2722
}
2723

    
2724
/**
2725
 * handles slice ends.
2726
 * @return 1 if it seems to be the last slice of
2727
 */
2728
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2729
{
2730
    Mpeg1Context *s1 = avctx->priv_data;
2731
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2732

    
2733
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2734
        return 0;
2735

    
2736
#ifdef HAVE_XVMC
2737
    if(s->avctx->xvmc_acceleration)
2738
        XVMC_field_end(s);
2739
#endif
2740
    /* end of slice reached */
2741
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2742
        /* end of image */
2743

    
2744
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2745

    
2746
        ff_er_frame_end(s);
2747

    
2748
        MPV_frame_end(s);
2749

    
2750
        if (s->pict_type == B_TYPE || s->low_delay) {
2751
            *pict= *(AVFrame*)s->current_picture_ptr;
2752
            ff_print_debug_info(s, pict);
2753
        } else {
2754
            s->picture_number++;
2755
            /* latency of 1 frame for I and P frames */
2756
            /* XXX: use another variable than picture_number */
2757
            if (s->last_picture_ptr != NULL) {
2758
                *pict= *(AVFrame*)s->last_picture_ptr;
2759
                 ff_print_debug_info(s, pict);
2760
            }
2761
        }
2762

    
2763
        return 1;
2764
    } else {
2765
        return 0;
2766
    }
2767
}
2768

    
2769
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2770
                                 const uint8_t *buf, int buf_size)
2771
{
2772
    Mpeg1Context *s1 = avctx->priv_data;
2773
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2774
    int width,height;
2775
    int i, v, j;
2776

    
2777
    init_get_bits(&s->gb, buf, buf_size*8);
2778

    
2779
    width = get_bits(&s->gb, 12);
2780
    height = get_bits(&s->gb, 12);
2781
    if (width <= 0 || height <= 0 ||
2782
        (width % 2) != 0 || (height % 2) != 0)
2783
        return -1;
2784
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2785
    if (s->aspect_ratio_info == 0)
2786
        return -1;
2787
    s->frame_rate_index = get_bits(&s->gb, 4);
2788
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2789
        return -1;
2790
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2791
    if (get_bits1(&s->gb) == 0) /* marker */
2792
        return -1;
2793
    s->width = width;
2794
    s->height = height;
2795

    
2796
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2797
    skip_bits(&s->gb, 1);
2798

    
2799
    /* get matrix */
2800
    if (get_bits1(&s->gb)) {
2801
        for(i=0;i<64;i++) {
2802
            v = get_bits(&s->gb, 8);
2803
            if(v==0){
2804
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2805
                return -1;
2806
            }
2807
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2808
            s->intra_matrix[j] = v;
2809
            s->chroma_intra_matrix[j] = v;
2810
        }
2811
#ifdef DEBUG
2812
        dprintf("intra matrix present\n");
2813
        for(i=0;i<64;i++)
2814
            dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2815
        dprintf("\n");
2816
#endif
2817
    } else {
2818
        for(i=0;i<64;i++) {
2819
            j = s->dsp.idct_permutation[i];
2820
            v = ff_mpeg1_default_intra_matrix[i];
2821
            s->intra_matrix[j] = v;
2822
            s->chroma_intra_matrix[j] = v;
2823
        }
2824
    }
2825
    if (get_bits1(&s->gb)) {
2826
        for(i=0;i<64;i++) {
2827
            v = get_bits(&s->gb, 8);
2828
            if(v==0){
2829
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2830
                return -1;
2831
            }
2832
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2833
            s->inter_matrix[j] = v;
2834
            s->chroma_inter_matrix[j] = v;
2835
        }
2836
#ifdef DEBUG
2837
        dprintf("non intra matrix present\n");
2838
        for(i=0;i<64;i++)
2839
            dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2840
        dprintf("\n");
2841
#endif
2842
    } else {
2843
        for(i=0;i<64;i++) {
2844
            int j= s->dsp.idct_permutation[i];
2845
            v = ff_mpeg1_default_non_intra_matrix[i];
2846
            s->inter_matrix[j] = v;
2847
            s->chroma_inter_matrix[j] = v;
2848
        }
2849
    }
2850

    
2851
    if(show_bits(&s->gb, 23) != 0){
2852
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2853
        return -1;
2854
    }
2855

    
2856
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2857
    s->progressive_sequence = 1;
2858
    s->progressive_frame = 1;
2859
    s->picture_structure = PICT_FRAME;
2860
    s->frame_pred_frame_dct = 1;
2861
    s->chroma_format = 1;
2862
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2863
    avctx->sub_id = 1; /* indicates mpeg1 */
2864
    s->out_format = FMT_MPEG1;
2865
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2866
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2867

    
2868
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2869
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2870
               s->avctx->rc_buffer_size, s->bit_rate);
2871

    
2872
    return 0;
2873
}
2874

    
2875
static int vcr2_init_sequence(AVCodecContext *avctx)
2876
{
2877
    Mpeg1Context *s1 = avctx->priv_data;
2878
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2879
    int i, v;
2880

    
2881
    /* start new mpeg1 context decoding */
2882
    s->out_format = FMT_MPEG1;
2883
    if (s1->mpeg_enc_ctx_allocated) {
2884
        MPV_common_end(s);
2885
    }
2886
    s->width  = avctx->coded_width;
2887
    s->height = avctx->coded_height;
2888
    avctx->has_b_frames= 0; //true?
2889
    s->low_delay= 1;
2890

    
2891
    if(avctx->xvmc_acceleration){
2892
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2893
    }else{
2894
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2895
    }
2896

    
2897
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2898
        if( avctx->idct_algo == FF_IDCT_AUTO )
2899
            avctx->idct_algo = FF_IDCT_SIMPLE;
2900

    
2901
    if (MPV_common_init(s) < 0)
2902
        return -1;
2903
    exchange_uv(s);//common init reset pblocks, so we swap them here
2904
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2905
    s1->mpeg_enc_ctx_allocated = 1;
2906

    
2907
    for(i=0;i<64;i++) {
2908
        int j= s->dsp.idct_permutation[i];
2909
        v = ff_mpeg1_default_intra_matrix[i];
2910
        s->intra_matrix[j] = v;
2911
        s->chroma_intra_matrix[j] = v;
2912

    
2913
        v = ff_mpeg1_default_non_intra_matrix[i];
2914
        s->inter_matrix[j] = v;
2915
        s->chroma_inter_matrix[j] = v;
2916
    }
2917

    
2918
    s->progressive_sequence = 1;
2919
    s->progressive_frame = 1;
2920
    s->picture_structure = PICT_FRAME;
2921
    s->frame_pred_frame_dct = 1;
2922
    s->chroma_format = 1;
2923
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2924
    avctx->sub_id = 2; /* indicates mpeg2 */
2925
    return 0;
2926
}
2927

    
2928

    
2929
static void mpeg_decode_user_data(AVCodecContext *avctx,
2930
                                  const uint8_t *buf, int buf_size)
2931
{
2932
    const uint8_t *p;
2933
    int len, flags;
2934
    p = buf;
2935
    len = buf_size;
2936

    
2937
    /* we parse the DTG active format information */
2938
    if (len >= 5 &&
2939
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2940
        flags = p[4];
2941
        p += 5;
2942
        len -= 5;
2943
        if (flags & 0x80) {
2944
            /* skip event id */
2945
            if (len < 2)
2946
                return;
2947
            p += 2;
2948
            len -= 2;
2949
        }
2950
        if (flags & 0x40) {
2951
            if (len < 1)
2952
                return;
2953
            avctx->dtg_active_format = p[0] & 0x0f;
2954
        }
2955
    }
2956
}
2957

    
2958
static void mpeg_decode_gop(AVCodecContext *avctx,
2959
                            const uint8_t *buf, int buf_size){
2960
    Mpeg1Context *s1 = avctx->priv_data;
2961
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2962

    
2963
    int drop_frame_flag;
2964
    int time_code_hours, time_code_minutes;
2965
    int time_code_seconds, time_code_pictures;
2966
    int broken_link;
2967

    
2968
    init_get_bits(&s->gb, buf, buf_size*8);
2969

    
2970
    drop_frame_flag = get_bits1(&s->gb);
2971

    
2972
    time_code_hours=get_bits(&s->gb,5);
2973
    time_code_minutes = get_bits(&s->gb,6);
2974
    skip_bits1(&s->gb);//marker bit
2975
    time_code_seconds = get_bits(&s->gb,6);
2976
    time_code_pictures = get_bits(&s->gb,6);
2977

    
2978
    /*broken_link indicate that after editing the
2979
      reference frames of the first B-Frames after GOP I-Frame
2980
      are missing (open gop)*/
2981
    broken_link = get_bits1(&s->gb);
2982

    
2983
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2984
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2985
            time_code_hours, time_code_minutes, time_code_seconds,
2986
            time_code_pictures, broken_link);
2987
}
2988
/**
2989
 * finds the end of the current frame in the bitstream.
2990
 * @return the position of the first byte of the next frame, or -1
2991
 */
2992
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2993
{
2994
    int i;
2995
    uint32_t state= pc->state;
2996

    
2997
    i=0;
2998
    if(!pc->frame_start_found){
2999
        for(i=0; i<buf_size; i++){
3000
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3001
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3002
                i++;
3003
                pc->frame_start_found=1;
3004
                break;
3005
            }
3006
        }
3007
    }
3008

    
3009
    if(pc->frame_start_found){
3010
        /* EOF considered as end of frame */
3011
        if (buf_size == 0)
3012
            return 0;
3013
        for(; i<buf_size; i++){
3014
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3015
            if((state&0xFFFFFF00) == 0x100){
3016
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3017
                    pc->frame_start_found=0;
3018
                    pc->state=-1;
3019
                    return i-3;
3020
                }
3021
            }
3022
        }
3023
    }
3024
    pc->state= state;
3025
    return END_NOT_FOUND;
3026
}
3027

    
3028
/* handle buffering and image synchronisation */
3029
static int mpeg_decode_frame(AVCodecContext *avctx,
3030
                             void *data, int *data_size,
3031
                             uint8_t *buf, int buf_size)
3032
{
3033
    Mpeg1Context *s = avctx->priv_data;
3034
    const uint8_t *buf_end;
3035
    const uint8_t *buf_ptr;
3036
    int ret, start_code, input_size;
3037
    AVFrame *picture = data;
3038
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
3039
    dprintf("fill_buffer\n");
3040

    
3041
    if (buf_size == 0) {
3042
        /* special case for last picture */
3043
        if (s2->low_delay==0 && s2->next_picture_ptr) {
3044
            *picture= *(AVFrame*)s2->next_picture_ptr;
3045
            s2->next_picture_ptr= NULL;
3046

    
3047
            *data_size = sizeof(AVFrame);
3048
        }
3049
        return 0;
3050
    }
3051

    
3052
    if(s2->flags&CODEC_FLAG_TRUNCATED){
3053
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3054

    
3055
        if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3056
            return buf_size;
3057
    }
3058

    
3059
    buf_ptr = buf;
3060
    buf_end = buf + buf_size;
3061

    
3062
#if 0
3063
    if (s->repeat_field % 2 == 1) {
3064
        s->repeat_field++;
3065
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3066
        //        s2->picture_number, s->repeat_field);
3067
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3068
            *data_size = sizeof(AVPicture);
3069
            goto the_end;
3070
        }
3071
    }
3072
#endif
3073

    
3074
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3075
        vcr2_init_sequence(avctx);
3076

    
3077
    s->slice_count= 0;
3078

    
3079
    for(;;) {
3080
        /* find start next code */
3081
        start_code = -1;
3082
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3083
        if (start_code < 0){
3084
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3085
                if(avctx->thread_count > 1){
3086
                    int i;
3087

    
3088
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3089
                    for(i=0; i<s->slice_count; i++)
3090
                        s2->error_count += s2->thread_context[i]->error_count;
3091
                }
3092
                if (slice_end(avctx, picture)) {
3093
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3094
                        *data_size = sizeof(AVPicture);
3095
                }
3096
            }
3097
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3098
        }
3099

    
3100
        input_size = buf_end - buf_ptr;
3101

    
3102
        if(avctx->debug & FF_DEBUG_STARTCODE){
3103
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3104
        }
3105

    
3106
                /* prepare data for next start code */
3107
                switch(start_code) {
3108
                case SEQ_START_CODE:
3109
                    mpeg1_decode_sequence(avctx, buf_ptr,
3110
                                          input_size);
3111
                    break;
3112

    
3113
                case PICTURE_START_CODE:
3114
                    /* we have a complete image : we try to decompress it */
3115
                    mpeg1_decode_picture(avctx,
3116
                                         buf_ptr, input_size);
3117
                    break;
3118
                case EXT_START_CODE:
3119
                    mpeg_decode_extension(avctx,
3120
                                          buf_ptr, input_size);
3121
                    break;
3122
                case USER_START_CODE:
3123
                    mpeg_decode_user_data(avctx,
3124
                                          buf_ptr, input_size);
3125
                    break;
3126
                case GOP_START_CODE:
3127
                    s2->first_field=0;
3128
                    mpeg_decode_gop(avctx,
3129
                                          buf_ptr, input_size);
3130
                    break;
3131
                default:
3132
                    if (start_code >= SLICE_MIN_START_CODE &&
3133
                        start_code <= SLICE_MAX_START_CODE) {
3134
                        int mb_y= start_code - SLICE_MIN_START_CODE;
3135

    
3136
                        if(s2->last_picture_ptr==NULL){
3137
                        /* skip b frames if we dont have reference frames */
3138
                            if(s2->pict_type==B_TYPE) break;
3139
                        /* skip P frames if we dont have reference frame no valid header */
3140
//                            if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3141
                        }
3142
                        /* skip b frames if we are in a hurry */
3143
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3144
                        if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3145
                           ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3146
                           || avctx->skip_frame >= AVDISCARD_ALL)
3147
                            break;
3148
                        /* skip everything if we are in a hurry>=5 */
3149
                        if(avctx->hurry_up>=5) break;
3150

    
3151
                        if (!s->mpeg_enc_ctx_allocated) break;
3152

    
3153
                        if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3154
                            if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3155
                                break;
3156
                        }
3157

    
3158
                        if(s2->first_slice){
3159
                            s2->first_slice=0;
3160
                            if(mpeg_field_start(s2) < 0)
3161
                                return -1;
3162
                        }
3163

    
3164
                        if(avctx->thread_count > 1){
3165
                            int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3166
                            if(threshold <= mb_y){
3167
                                MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3168

    
3169
                                thread_context->start_mb_y= mb_y;
3170
                                thread_context->end_mb_y  = s2->mb_height;
3171
                                if(s->slice_count){
3172
                                    s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3173
                                    ff_update_duplicate_context(thread_context, s2);
3174
                                }
3175
                                init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3176
                                s->slice_count++;
3177
                            }
3178
                            buf_ptr += 2; //FIXME add minimum num of bytes per slice
3179
                        }else{
3180
                            ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3181
                            emms_c();
3182

    
3183
                            if(ret < 0){
3184
                                if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3185
                                    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);
3186
                            }else{
3187
                                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);
3188
                            }
3189
                        }
3190
                    }
3191
                    break;
3192
                }
3193
    }
3194
}
3195

    
3196
static int mpeg_decode_end(AVCodecContext *avctx)
3197
{
3198
    Mpeg1Context *s = avctx->priv_data;
3199

    
3200
    if (s->mpeg_enc_ctx_allocated)
3201
        MPV_common_end(&s->mpeg_enc_ctx);
3202
    return 0;
3203
}
3204

    
3205
AVCodec mpeg1video_decoder = {
3206
    "mpeg1video",
3207
    CODEC_TYPE_VIDEO,
3208
    CODEC_ID_MPEG1VIDEO,
3209
    sizeof(Mpeg1Context),
3210
    mpeg_decode_init,
3211
    NULL,
3212
    mpeg_decode_end,
3213
    mpeg_decode_frame,
3214
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3215
    .flush= ff_mpeg_flush,
3216
};
3217

    
3218
AVCodec mpeg2video_decoder = {
3219
    "mpeg2video",
3220
    CODEC_TYPE_VIDEO,
3221
    CODEC_ID_MPEG2VIDEO,
3222
    sizeof(Mpeg1Context),
3223
    mpeg_decode_init,
3224
    NULL,
3225
    mpeg_decode_end,
3226
    mpeg_decode_frame,
3227
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3228
    .flush= ff_mpeg_flush,
3229
};
3230

    
3231
//legacy decoder
3232
AVCodec mpegvideo_decoder = {
3233
    "mpegvideo",
3234
    CODEC_TYPE_VIDEO,
3235
    CODEC_ID_MPEG2VIDEO,
3236
    sizeof(Mpeg1Context),
3237
    mpeg_decode_init,
3238
    NULL,
3239
    mpeg_decode_end,
3240
    mpeg_decode_frame,
3241
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3242
    .flush= ff_mpeg_flush,
3243
};
3244

    
3245
#ifdef CONFIG_ENCODERS
3246

    
3247
AVCodec mpeg1video_encoder = {
3248
    "mpeg1video",
3249
    CODEC_TYPE_VIDEO,
3250
    CODEC_ID_MPEG1VIDEO,
3251
    sizeof(MpegEncContext),
3252
    encode_init,
3253
    MPV_encode_picture,
3254
    MPV_encode_end,
3255
    .supported_framerates= ff_frame_rate_tab+1,
3256
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3257
    .capabilities= CODEC_CAP_DELAY,
3258
};
3259

    
3260
AVCodec mpeg2video_encoder = {
3261
    "mpeg2video",
3262
    CODEC_TYPE_VIDEO,
3263
    CODEC_ID_MPEG2VIDEO,
3264
    sizeof(MpegEncContext),
3265
    encode_init,
3266
    MPV_encode_picture,
3267
    MPV_encode_end,
3268
    .supported_framerates= ff_frame_rate_tab+1,
3269
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3270
    .capabilities= CODEC_CAP_DELAY,
3271
};
3272
#endif
3273

    
3274
#ifdef HAVE_XVMC
3275
static int mpeg_mc_decode_init(AVCodecContext *avctx){
3276
    Mpeg1Context *s;
3277

    
3278
    if( avctx->thread_count > 1)
3279
        return -1;
3280
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3281
        return -1;
3282
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3283
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3284
    }
3285
    mpeg_decode_init(avctx);
3286
    s = avctx->priv_data;
3287

    
3288
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3289
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3290

    
3291
    return 0;
3292
}
3293

    
3294
AVCodec mpeg_xvmc_decoder = {
3295
    "mpegvideo_xvmc",
3296
    CODEC_TYPE_VIDEO,
3297
    CODEC_ID_MPEG2VIDEO_XVMC,
3298
    sizeof(Mpeg1Context),
3299
    mpeg_mc_decode_init,
3300
    NULL,
3301
    mpeg_decode_end,
3302
    mpeg_decode_frame,
3303
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3304
    .flush= ff_mpeg_flush,
3305
};
3306

    
3307
#endif
3308

    
3309
/* this is ugly i know, but the alternative is too make
3310
   hundreds of vars global and prefix them with ff_mpeg1_
3311
   which is far uglier. */
3312
#include "mdec.c"