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ffmpeg / libavcodec / mpeg12.c @ da9c9637

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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
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with this library; if not, write to the Free Software
18
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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
44
#define EXT_START_CODE                0x000001b5
45
#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, 
62
                              DCTELEM *block, 
63
                              int n);
64
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
65
                              DCTELEM *block, 
66
                              int n);
67
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, 
69
                                        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 int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
76
static void exchange_uv(MpegEncContext *s);
77

    
78
#ifdef HAVE_XVMC
79
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
80
extern int XVMC_field_end(MpegEncContext *s);
81
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
82
extern void XVMC_init_block(MpegEncContext *s);//set s->block
83
#endif
84

    
85
const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
86
const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
87
const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
88
const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
89
                                           PIX_FMT_XVMC_MPEG2_IDCT,
90
                                           PIX_FMT_XVMC_MPEG2_MC,
91
                                           -1};
92
#ifdef CONFIG_ENCODERS
93
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
94
static uint8_t fcode_tab[MAX_MV*2+1];
95

    
96
static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
97
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
98

    
99
/* simple include everything table for dc, first byte is bits number next 3 are code*/
100
static uint32_t mpeg1_lum_dc_uni[512];
101
static uint32_t mpeg1_chr_dc_uni[512];
102

    
103
static uint8_t mpeg1_index_run[2][64];
104
static int8_t mpeg1_max_level[2][64];
105
#endif //CONFIG_ENCODERS
106

    
107
static void init_2d_vlc_rl(RLTable *rl)
108
{
109
    int i;
110
    
111
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
112
             &rl->table_vlc[0][1], 4, 2,
113
             &rl->table_vlc[0][0], 4, 2);
114

    
115
    
116
    rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
117
    for(i=0; i<rl->vlc.table_size; i++){
118
        int code= rl->vlc.table[i][0];
119
        int len = rl->vlc.table[i][1];
120
        int level, run;
121
    
122
        if(len==0){ // illegal code
123
            run= 65;
124
            level= MAX_LEVEL;
125
        }else if(len<0){ //more bits needed
126
            run= 0;
127
            level= code;
128
        }else{
129
            if(code==rl->n){ //esc
130
                run= 65;
131
                level= 0;
132
            }else if(code==rl->n+1){ //eob
133
                run= 0;
134
                level= 127;
135
            }else{
136
                run=   rl->table_run  [code] + 1;
137
                level= rl->table_level[code];
138
            }
139
        }
140
        rl->rl_vlc[0][i].len= len;
141
        rl->rl_vlc[0][i].level= level;
142
        rl->rl_vlc[0][i].run= run;
143
    }
144
}
145

    
146
#ifdef CONFIG_ENCODERS
147
static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
148
    int i;
149

    
150
    for(i=0; i<128; i++){
151
        int level= i-64;
152
        int run;
153
        for(run=0; run<64; run++){
154
            int len, bits, code;
155
            
156
            int alevel= ABS(level);
157
            int sign= (level>>31)&1;
158

    
159
            if (alevel > rl->max_level[0][run])
160
                code= 111; /*rl->n*/
161
            else
162
                code= rl->index_run[0][run] + alevel - 1;
163

    
164
            if (code < 111 /* rl->n */) {
165
                    /* store the vlc & sign at once */
166
                len=   mpeg1_vlc[code][1]+1;
167
                bits= (mpeg1_vlc[code][0]<<1) + sign;
168
            } else {
169
                len=  mpeg1_vlc[111/*rl->n*/][1]+6;
170
                bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
171

    
172
                bits|= run;
173
                if (alevel < 128) {
174
                    bits<<=8; len+=8;
175
                    bits|= level & 0xff;
176
                } else {
177
                    bits<<=16; len+=16;
178
                    bits|= level & 0xff;
179
                    if (level < 0) {
180
                        bits|= 0x8001 + level + 255;
181
                    } else {
182
                        bits|= level & 0xffff;
183
                    }
184
                }
185
            }
186

    
187
            uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
188
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
189
        }
190
    }
191
}
192

    
193

    
194
static int find_frame_rate_index(MpegEncContext *s){
195
    int i;
196
    int64_t dmin= INT64_MAX;
197
    int64_t d;
198

    
199
    for(i=1;i<14;i++) {
200
        int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->frame_rate_base;
201
        int64_t n1= 1001LL*s->avctx->frame_rate;
202
        if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
203

    
204
        d = ABS(n0 - n1);
205
        if(d < dmin){
206
            dmin=d;
207
            s->frame_rate_index= i;
208
        }
209
    }
210
    if(dmin)
211
        return -1;
212
    else
213
        return 0;
214
}
215

    
216
static int encode_init(AVCodecContext *avctx)
217
{
218
    MpegEncContext *s = avctx->priv_data;
219

    
220
    if(MPV_encode_init(avctx) < 0)
221
        return -1;
222

    
223
    if(find_frame_rate_index(s) < 0){
224
        if(s->strict_std_compliance >=0){
225
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 doesnt support %d/%d fps\n", avctx->frame_rate, avctx->frame_rate_base);
226
            return -1;
227
        }else{
228
            av_log(avctx, AV_LOG_INFO, "MPEG1/2 doesnt support %d/%d fps, there may be AV sync issues\n", avctx->frame_rate, avctx->frame_rate_base);
229
        }
230
    }
231
    
232
    return 0;
233
}
234

    
235
static void put_header(MpegEncContext *s, int header)
236
{
237
    align_put_bits(&s->pb);
238
    put_bits(&s->pb, 16, header>>16);
239
    put_bits(&s->pb, 16, header&0xFFFF);
240
}
241

    
242
/* put sequence header if needed */
243
static void mpeg1_encode_sequence_header(MpegEncContext *s)
244
{
245
        unsigned int vbv_buffer_size;
246
        unsigned int fps, v;
247
        int i;
248
        uint64_t time_code;
249
        float best_aspect_error= 1E10;
250
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
251
        int constraint_parameter_flag;
252
        
253
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
254
        
255
        if (s->current_picture.key_frame) {
256
            AVRational framerate= frame_rate_tab[s->frame_rate_index];
257

    
258
            /* mpeg1 header repeated every gop */
259
            put_header(s, SEQ_START_CODE);
260
 
261
            put_bits(&s->pb, 12, s->width);
262
            put_bits(&s->pb, 12, s->height);
263
            
264
            for(i=1; i<15; i++){
265
                float error= aspect_ratio;
266
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
267
                    error-= 1.0/mpeg1_aspect[i];
268
                else
269
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
270
             
271
                error= ABS(error);
272
                
273
                if(error < best_aspect_error){
274
                    best_aspect_error= error;
275
                    s->aspect_ratio_info= i;
276
                }
277
            }
278
            
279
            put_bits(&s->pb, 4, s->aspect_ratio_info);
280
            put_bits(&s->pb, 4, s->frame_rate_index);
281
            
282
            if(s->avctx->rc_max_rate){
283
                v = (s->avctx->rc_max_rate + 399) / 400;
284
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
285
                    v = 0x3ffff;
286
            }else{
287
                v= 0x3FFFF;
288
            }
289

    
290
            if(s->avctx->rc_buffer_size)
291
                vbv_buffer_size = s->avctx->rc_buffer_size;
292
            else
293
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
294
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
295
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
296

    
297
            put_bits(&s->pb, 18, v & 0x3FFFF);
298
            put_bits(&s->pb, 1, 1); /* marker */
299
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
300

    
301
            constraint_parameter_flag= 
302
                s->width <= 768 && s->height <= 576 && 
303
                s->mb_width * s->mb_height <= 396 &&
304
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
305
                framerate.num <= framerate.den*30 &&
306
                vbv_buffer_size <= 20 &&
307
                v <= 1856000/400 &&
308
                s->codec_id == CODEC_ID_MPEG1VIDEO;
309
                
310
            put_bits(&s->pb, 1, constraint_parameter_flag);
311
            
312
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
313
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
314

    
315
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
316
                put_header(s, EXT_START_CODE);
317
                put_bits(&s->pb, 4, 1); //seq ext
318
                put_bits(&s->pb, 1, 0); //esc
319
                
320
                if(s->avctx->profile == FF_PROFILE_UNKNOWN){
321
                    put_bits(&s->pb, 3, 4); //profile
322
                }else{
323
                    put_bits(&s->pb, 3, s->avctx->profile); //profile
324
                }
325

    
326
                if(s->avctx->level == FF_LEVEL_UNKNOWN){
327
                    put_bits(&s->pb, 4, 8); //level
328
                }else{
329
                    put_bits(&s->pb, 4, s->avctx->level); //level
330
                }
331

    
332
                put_bits(&s->pb, 1, s->progressive_sequence);
333
                put_bits(&s->pb, 2, 1); //chroma format 4:2:0
334
                put_bits(&s->pb, 2, 0); //horizontal size ext
335
                put_bits(&s->pb, 2, 0); //vertical size ext
336
                put_bits(&s->pb, 12, v>>18); //bitrate ext
337
                put_bits(&s->pb, 1, 1); //marker
338
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
339
                put_bits(&s->pb, 1, s->low_delay);
340
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
341
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
342
            }
343
            
344
            put_header(s, GOP_START_CODE);
345
            put_bits(&s->pb, 1, 0); /* do drop frame */
346
            /* time code : we must convert from the real frame rate to a
347
               fake mpeg frame rate in case of low frame rate */
348
            fps = (framerate.num + framerate.den/2)/ framerate.den;
349
            time_code = s->current_picture_ptr->coded_picture_number;
350

    
351
            s->gop_picture_number = time_code;
352
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
353
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
354
            put_bits(&s->pb, 1, 1);
355
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
356
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
357
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
358
            put_bits(&s->pb, 1, 0); /* broken link */
359
        }
360
}
361

    
362
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
363
    while (run >= 33) {
364
        put_bits(&s->pb, 11, 0x008);
365
        run -= 33;
366
    }
367
    put_bits(&s->pb, mbAddrIncrTable[run][1], 
368
             mbAddrIncrTable[run][0]);
369
}
370
#endif //CONFIG_ENCODERS
371

    
372
static void common_init(MpegEncContext *s)
373
{
374

    
375
    s->y_dc_scale_table=
376
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
377

    
378
}
379

    
380
void ff_mpeg1_clean_buffers(MpegEncContext *s){
381
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
382
    s->last_dc[1] = s->last_dc[0];
383
    s->last_dc[2] = s->last_dc[0];
384
    memset(s->last_mv, 0, sizeof(s->last_mv));
385
}
386

    
387
#ifdef CONFIG_ENCODERS
388

    
389
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
390
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
391
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
392
    put_bits(&s->pb, 1, 0); /* slice extra information */
393
}
394

    
395
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
396
{
397
    mpeg1_encode_sequence_header(s);
398

    
399
    /* mpeg1 picture header */
400
    put_header(s, PICTURE_START_CODE);
401
    /* temporal reference */
402

    
403
    // RAL: s->picture_number instead of s->fake_picture_number
404
    put_bits(&s->pb, 10, (s->picture_number - 
405
                          s->gop_picture_number) & 0x3ff); 
406
    put_bits(&s->pb, 3, s->pict_type);
407

    
408
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
409
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
410
    
411
    // RAL: Forward f_code also needed for B frames
412
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
413
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
414
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
415
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
416
        else
417
            put_bits(&s->pb, 3, 7); /* forward_f_code */
418
    }
419
    
420
    // RAL: Backward f_code necessary for B frames
421
    if (s->pict_type == B_TYPE) {
422
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
423
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
424
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
425
        else
426
            put_bits(&s->pb, 3, 7); /* backward_f_code */
427
    }
428

    
429
    put_bits(&s->pb, 1, 0); /* extra bit picture */
430

    
431
    s->frame_pred_frame_dct = 1;
432
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
433
        put_header(s, EXT_START_CODE);
434
        put_bits(&s->pb, 4, 8); //pic ext
435
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
436
            put_bits(&s->pb, 4, s->f_code);
437
            put_bits(&s->pb, 4, s->f_code);
438
        }else{
439
            put_bits(&s->pb, 8, 255);
440
        }
441
        if (s->pict_type == B_TYPE) {
442
            put_bits(&s->pb, 4, s->b_code);
443
            put_bits(&s->pb, 4, s->b_code);
444
        }else{
445
            put_bits(&s->pb, 8, 255);
446
        }
447
        put_bits(&s->pb, 2, s->intra_dc_precision);
448
        
449
        assert(s->picture_structure == PICT_FRAME);
450
        put_bits(&s->pb, 2, s->picture_structure);
451
        if (s->progressive_sequence) {
452
            put_bits(&s->pb, 1, 0); /* no repeat */
453
        } else {
454
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
455
        }
456
        /* XXX: optimize the generation of this flag with entropy
457
           measures */
458
        s->frame_pred_frame_dct = s->progressive_sequence;
459
        
460
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
461
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
462
        put_bits(&s->pb, 1, s->q_scale_type);
463
        put_bits(&s->pb, 1, s->intra_vlc_format);
464
        put_bits(&s->pb, 1, s->alternate_scan);
465
        put_bits(&s->pb, 1, s->repeat_first_field);
466
        put_bits(&s->pb, 1, s->chroma_420_type=1);
467
        s->progressive_frame = s->progressive_sequence;
468
        put_bits(&s->pb, 1, s->progressive_frame);
469
        put_bits(&s->pb, 1, 0); //composite_display_flag
470
    }
471
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
472
        int i;
473

    
474
        put_header(s, USER_START_CODE);
475
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
476
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
477
        }
478
    }
479
    
480
    s->mb_y=0;
481
    ff_mpeg1_encode_slice_header(s);
482
}
483

    
484
static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
485
                                int has_mv, int field_motion)
486
{
487
    put_bits(&s->pb, n, bits);
488
    if (!s->frame_pred_frame_dct) {
489
        if (has_mv) 
490
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
491
        put_bits(&s->pb, 1, s->interlaced_dct);
492
    }
493
}
494

    
495
void mpeg1_encode_mb(MpegEncContext *s,
496
                     DCTELEM block[6][64],
497
                     int motion_x, int motion_y)
498
{
499
    int i, cbp;
500
    const int mb_x = s->mb_x;
501
    const int mb_y = s->mb_y;
502
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
503

    
504
    /* compute cbp */
505
    cbp = 0;
506
    for(i=0;i<6;i++) {
507
        if (s->block_last_index[i] >= 0)
508
            cbp |= 1 << (5 - i);
509
    }
510
    
511
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
512
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
513
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
514
        (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) |
515
        ((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))) {
516
        s->mb_skip_run++;
517
        s->qscale -= s->dquant;
518
        s->skip_count++;
519
        s->misc_bits++;
520
        s->last_bits++;
521
        if(s->pict_type == P_TYPE){
522
            s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
523
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
524
        }
525
    } else {
526
        if(first_mb){
527
            assert(s->mb_skip_run == 0);
528
            encode_mb_skip_run(s, s->mb_x);
529
        }else{
530
            encode_mb_skip_run(s, s->mb_skip_run);
531
        }
532
        
533
        if (s->pict_type == I_TYPE) {
534
            if(s->dquant && cbp){
535
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
536
                put_bits(&s->pb, 5, s->qscale);
537
            }else{
538
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
539
                s->qscale -= s->dquant;
540
            }
541
            s->misc_bits+= get_bits_diff(s);
542
            s->i_count++;
543
        } else if (s->mb_intra) {
544
            if(s->dquant && cbp){
545
                put_mb_modes(s, 6, 0x01, 0, 0);
546
                put_bits(&s->pb, 5, s->qscale);
547
            }else{
548
                put_mb_modes(s, 5, 0x03, 0, 0);
549
                s->qscale -= s->dquant;
550
            }
551
            s->misc_bits+= get_bits_diff(s);
552
            s->i_count++;
553
            memset(s->last_mv, 0, sizeof(s->last_mv));
554
        } else if (s->pict_type == P_TYPE) { 
555
            if(s->mv_type == MV_TYPE_16X16){
556
                if (cbp != 0) {
557
                    if ((motion_x|motion_y) == 0) {
558
                        if(s->dquant){
559
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
560
                            put_bits(&s->pb, 5, s->qscale);
561
                        }else{
562
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
563
                        }
564
                        s->misc_bits+= get_bits_diff(s);
565
                    } else {
566
                        if(s->dquant){
567
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
568
                            put_bits(&s->pb, 5, s->qscale);
569
                        }else{
570
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
571
                        }
572
                        s->misc_bits+= get_bits_diff(s);
573
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
574
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
575
                        s->mv_bits+= get_bits_diff(s);
576
                    }
577
                } else {
578
                    put_bits(&s->pb, 3, 1); /* motion only */
579
                    if (!s->frame_pred_frame_dct)
580
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
581
                    s->misc_bits+= get_bits_diff(s);
582
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
583
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
584
                    s->qscale -= s->dquant;
585
                    s->mv_bits+= get_bits_diff(s);
586
                }
587
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
588
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
589
            }else{
590
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
591

    
592
                if (cbp) {
593
                    if(s->dquant){
594
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
595
                        put_bits(&s->pb, 5, s->qscale);
596
                    }else{
597
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
598
                    }
599
                } else {
600
                    put_bits(&s->pb, 3, 1); /* motion only */
601
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
602
                    s->qscale -= s->dquant;
603
                }
604
                s->misc_bits+= get_bits_diff(s);
605
                for(i=0; i<2; i++){
606
                    put_bits(&s->pb, 1, s->field_select[0][i]);
607
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
608
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
609
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
610
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
611
                }
612
                s->mv_bits+= get_bits_diff(s);
613
            }
614
            if(cbp)
615
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
616
            s->f_count++;
617
        } else{  
618
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
619

    
620
            if(s->mv_type == MV_TYPE_16X16){
621
                if (cbp){    // With coded bloc pattern
622
                    if (s->dquant) {
623
                        if(s->mv_dir == MV_DIR_FORWARD)
624
                            put_mb_modes(s, 6, 3, 1, 0);
625
                        else
626
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
627
                        put_bits(&s->pb, 5, s->qscale);
628
                    } else {
629
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
630
                    }
631
                }else{    // No coded bloc pattern
632
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
633
                    if (!s->frame_pred_frame_dct)
634
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
635
                    s->qscale -= s->dquant;
636
                }
637
                s->misc_bits += get_bits_diff(s);
638
                if (s->mv_dir&MV_DIR_FORWARD){
639
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
640
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
641
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
642
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
643
                    s->f_count++;
644
                }
645
                if (s->mv_dir&MV_DIR_BACKWARD){
646
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
647
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
648
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
649
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
650
                    s->b_count++;
651
                }
652
            }else{
653
                assert(s->mv_type == MV_TYPE_FIELD);
654
                assert(!s->frame_pred_frame_dct);
655
                if (cbp){    // With coded bloc pattern
656
                    if (s->dquant) {
657
                        if(s->mv_dir == MV_DIR_FORWARD)
658
                            put_mb_modes(s, 6, 3, 1, 1);
659
                        else
660
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
661
                        put_bits(&s->pb, 5, s->qscale);
662
                    } else {
663
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
664
                    }
665
                }else{    // No coded bloc pattern
666
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
667
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
668
                    s->qscale -= s->dquant;
669
                }
670
                s->misc_bits += get_bits_diff(s);
671
                if (s->mv_dir&MV_DIR_FORWARD){
672
                    for(i=0; i<2; i++){
673
                        put_bits(&s->pb, 1, s->field_select[0][i]);
674
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
675
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
676
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
677
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
678
                    }
679
                    s->f_count++;
680
                }
681
                if (s->mv_dir&MV_DIR_BACKWARD){
682
                    for(i=0; i<2; i++){
683
                        put_bits(&s->pb, 1, s->field_select[1][i]);
684
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
685
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
686
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
687
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
688
                    }
689
                    s->b_count++;
690
                }
691
            }
692
            s->mv_bits += get_bits_diff(s);
693
            if(cbp)
694
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
695
        }
696
        for(i=0;i<6;i++) {
697
            if (cbp & (1 << (5 - i))) {
698
                mpeg1_encode_block(s, block[i], i);
699
            }
700
        }
701
        s->mb_skip_run = 0;
702
        if(s->mb_intra)
703
            s->i_tex_bits+= get_bits_diff(s);
704
        else
705
            s->p_tex_bits+= get_bits_diff(s);
706
    }
707
}
708

    
709
// RAL: Parameter added: f_or_b_code
710
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
711
{
712
    int code, bit_size, l, bits, range, sign;
713

    
714
    if (val == 0) {
715
        /* zero vector */
716
        code = 0;
717
        put_bits(&s->pb,
718
                 mbMotionVectorTable[0][1], 
719
                 mbMotionVectorTable[0][0]); 
720
    } else {
721
        bit_size = f_or_b_code - 1;
722
        range = 1 << bit_size;
723
        /* modulo encoding */
724
        l= INT_BIT - 5 - bit_size;
725
        val= (val<<l)>>l;
726

    
727
        if (val >= 0) {
728
            val--;
729
            code = (val >> bit_size) + 1;
730
            bits = val & (range - 1);
731
            sign = 0;
732
        } else {
733
            val = -val;
734
            val--;
735
            code = (val >> bit_size) + 1;
736
            bits = val & (range - 1);
737
            sign = 1;
738
        }
739

    
740
        assert(code > 0 && code <= 16);
741

    
742
        put_bits(&s->pb,
743
                 mbMotionVectorTable[code][1], 
744
                 mbMotionVectorTable[code][0]); 
745

    
746
        put_bits(&s->pb, 1, sign);
747
        if (bit_size > 0) {
748
            put_bits(&s->pb, bit_size, bits);
749
        }
750
    }
751
}
752

    
753
void ff_mpeg1_encode_init(MpegEncContext *s)
754
{
755
    static int done=0;
756

    
757
    common_init(s);
758

    
759
    if(!done){
760
        int f_code;
761
        int mv;
762
        int i;
763

    
764
        done=1;
765
        init_rl(&rl_mpeg1);
766

    
767
        for(i=0; i<64; i++)
768
        {
769
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
770
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
771
        }
772
        
773
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
774

    
775
        /* build unified dc encoding tables */
776
        for(i=-255; i<256; i++)
777
        {
778
                int adiff, index;
779
                int bits, code;
780
                int diff=i;
781

    
782
                adiff = ABS(diff);
783
                if(diff<0) diff--;
784
                index = av_log2(2*adiff);
785

    
786
                bits= vlc_dc_lum_bits[index] + index;
787
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
788
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
789
                
790
                bits= vlc_dc_chroma_bits[index] + index;
791
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
792
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
793
        }
794

    
795
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
796

    
797
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
798
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
799
                int len;
800

    
801
                if(mv==0) len= mbMotionVectorTable[0][1];
802
                else{
803
                    int val, bit_size, range, code;
804

    
805
                    bit_size = f_code - 1;
806
                    range = 1 << bit_size;
807

    
808
                    val=mv;
809
                    if (val < 0) 
810
                        val = -val;
811
                    val--;
812
                    code = (val >> bit_size) + 1;
813
                    if(code<17){
814
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
815
                    }else{
816
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
817
                    }
818
                }
819

    
820
                mv_penalty[f_code][mv+MAX_MV]= len;
821
            }
822
        }
823
        
824

    
825
        for(f_code=MAX_FCODE; f_code>0; f_code--){
826
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
827
                fcode_tab[mv+MAX_MV]= f_code;
828
            }
829
        }
830
    }
831
    s->me.mv_penalty= mv_penalty;
832
    s->fcode_tab= fcode_tab;
833
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
834
        s->min_qcoeff=-255;
835
        s->max_qcoeff= 255;
836
    }else{
837
        s->min_qcoeff=-2047;
838
        s->max_qcoeff= 2047;
839
    }
840
    s->intra_ac_vlc_length=
841
    s->inter_ac_vlc_length=
842
    s->intra_ac_vlc_last_length=
843
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
844
}
845

    
846
static inline void encode_dc(MpegEncContext *s, int diff, int component)
847
{
848
  if(((unsigned) (diff+255)) >= 511){
849
        int index;
850

    
851
        if(diff<0){
852
            index= av_log2_16bit(-2*diff);
853
            diff--;
854
        }else{
855
            index= av_log2_16bit(2*diff);
856
        }
857
        if (component == 0) {
858
            put_bits(
859
                &s->pb, 
860
                vlc_dc_lum_bits[index] + index,
861
                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
862
        }else{
863
            put_bits(
864
                &s->pb, 
865
                vlc_dc_chroma_bits[index] + index,
866
                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
867
        }
868
  }else{
869
    if (component == 0) {
870
        put_bits(
871
            &s->pb, 
872
            mpeg1_lum_dc_uni[diff+255]&0xFF,
873
            mpeg1_lum_dc_uni[diff+255]>>8);
874
    } else {
875
        put_bits(
876
            &s->pb, 
877
            mpeg1_chr_dc_uni[diff+255]&0xFF,
878
            mpeg1_chr_dc_uni[diff+255]>>8);
879
    }
880
  }
881
}
882

    
883
static void mpeg1_encode_block(MpegEncContext *s, 
884
                               DCTELEM *block, 
885
                               int n)
886
{
887
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
888
    int code, component;
889
//    RLTable *rl = &rl_mpeg1;
890

    
891
    last_index = s->block_last_index[n];
892

    
893
    /* DC coef */
894
    if (s->mb_intra) {
895
        component = (n <= 3 ? 0 : n - 4 + 1);
896
        dc = block[0]; /* overflow is impossible */
897
        diff = dc - s->last_dc[component];
898
        encode_dc(s, diff, component);
899
        s->last_dc[component] = dc;
900
        i = 1;
901
/*
902
        if (s->intra_vlc_format)
903
            rl = &rl_mpeg2;
904
        else
905
            rl = &rl_mpeg1;
906
*/
907
    } else {
908
        /* encode the first coefficient : needs to be done here because
909
           it is handled slightly differently */
910
        level = block[0];
911
        if (abs(level) == 1) {
912
                code = ((uint32_t)level >> 31); /* the sign bit */
913
                put_bits(&s->pb, 2, code | 0x02);
914
                i = 1;
915
        } else {
916
            i = 0;
917
            last_non_zero = -1;
918
            goto next_coef;
919
        }
920
    }
921

    
922
    /* now quantify & encode AC coefs */
923
    last_non_zero = i - 1;
924

    
925
    for(;i<=last_index;i++) {
926
        j = s->intra_scantable.permutated[i];
927
        level = block[j];
928
    next_coef:
929
#if 0
930
        if (level != 0)
931
            dprintf("level[%d]=%d\n", i, level);
932
#endif            
933
        /* encode using VLC */
934
        if (level != 0) {
935
            run = i - last_non_zero - 1;
936
            
937
            alevel= level;
938
            MASK_ABS(sign, alevel)
939
            sign&=1;
940

    
941
//            code = get_rl_index(rl, 0, run, alevel);
942
            if (alevel <= mpeg1_max_level[0][run]){
943
                code= mpeg1_index_run[0][run] + alevel - 1;
944
                    /* store the vlc & sign at once */
945
                put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
946
            } else {
947
                /* escape seems to be pretty rare <5% so i dont optimize it */
948
                put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
949
                /* escape: only clip in this case */
950
                put_bits(&s->pb, 6, run);
951
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
952
                    if (alevel < 128) {
953
                        put_bits(&s->pb, 8, level & 0xff);
954
                    } else {
955
                        if (level < 0) {
956
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
957
                        } else {
958
                            put_bits(&s->pb, 16, level & 0xffff);
959
                        }
960
                    }
961
                }else{
962
                    put_bits(&s->pb, 12, level & 0xfff);
963
                }
964
            }
965
            last_non_zero = i;
966
        }
967
    }
968
    /* end of block */
969
    put_bits(&s->pb, 2, 0x2);
970
}
971
#endif //CONFIG_ENCODERS
972

    
973
/******************************************/
974
/* decoding */
975

    
976
static VLC dc_lum_vlc;
977
static VLC dc_chroma_vlc;
978
static VLC mv_vlc;
979
static VLC mbincr_vlc;
980
static VLC mb_ptype_vlc;
981
static VLC mb_btype_vlc;
982
static VLC mb_pat_vlc;
983

    
984
static void init_vlcs(void)
985
{
986
    static int done = 0;
987

    
988
    if (!done) {
989
        done = 1;
990

    
991
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
992
                 vlc_dc_lum_bits, 1, 1,
993
                 vlc_dc_lum_code, 2, 2);
994
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
995
                 vlc_dc_chroma_bits, 1, 1,
996
                 vlc_dc_chroma_code, 2, 2);
997
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
998
                 &mbMotionVectorTable[0][1], 2, 1,
999
                 &mbMotionVectorTable[0][0], 2, 1);
1000
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
1001
                 &mbAddrIncrTable[0][1], 2, 1,
1002
                 &mbAddrIncrTable[0][0], 2, 1);
1003
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1004
                 &mbPatTable[0][1], 2, 1,
1005
                 &mbPatTable[0][0], 2, 1);
1006
        
1007
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
1008
                 &table_mb_ptype[0][1], 2, 1,
1009
                 &table_mb_ptype[0][0], 2, 1);
1010
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
1011
                 &table_mb_btype[0][1], 2, 1,
1012
                 &table_mb_btype[0][0], 2, 1);
1013
        init_rl(&rl_mpeg1);
1014
        init_rl(&rl_mpeg2);
1015

    
1016
        init_2d_vlc_rl(&rl_mpeg1);
1017
        init_2d_vlc_rl(&rl_mpeg2);
1018
    }
1019
}
1020

    
1021
static inline int get_dmv(MpegEncContext *s)
1022
{
1023
    if(get_bits1(&s->gb)) 
1024
        return 1 - (get_bits1(&s->gb) << 1);
1025
    else
1026
        return 0;
1027
}
1028

    
1029
static inline int get_qscale(MpegEncContext *s)
1030
{
1031
    int qscale = get_bits(&s->gb, 5);
1032
    if (s->q_scale_type) {
1033
        return non_linear_qscale[qscale];
1034
    } else {
1035
        return qscale << 1;
1036
    }
1037
}
1038

    
1039
/* motion type (for mpeg2) */
1040
#define MT_FIELD 1
1041
#define MT_FRAME 2
1042
#define MT_16X8  2
1043
#define MT_DMV   3
1044

    
1045
static int mpeg_decode_mb(MpegEncContext *s,
1046
                          DCTELEM block[12][64])
1047
{
1048
    int i, j, k, cbp, val, mb_type, motion_type;
1049
    const int mb_block_count = 4 + (1<< s->chroma_format)
1050

    
1051
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1052

    
1053
    assert(s->mb_skiped==0);
1054

    
1055
    if (s->mb_skip_run-- != 0) {
1056
        if(s->pict_type == I_TYPE){
1057
            av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1058
            return -1;
1059
        }
1060
    
1061
        /* skip mb */
1062
        s->mb_intra = 0;
1063
        for(i=0;i<12;i++)
1064
            s->block_last_index[i] = -1;
1065
        if(s->picture_structure == PICT_FRAME)
1066
            s->mv_type = MV_TYPE_16X16;
1067
        else
1068
            s->mv_type = MV_TYPE_FIELD;
1069
        if (s->pict_type == P_TYPE) {
1070
            /* if P type, zero motion vector is implied */
1071
            s->mv_dir = MV_DIR_FORWARD;
1072
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1073
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1074
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1075
            s->field_select[0][0]= s->picture_structure - 1;
1076
            s->mb_skiped = 1;
1077
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1078
        } else {
1079
            /* if B type, reuse previous vectors and directions */
1080
            s->mv[0][0][0] = s->last_mv[0][0][0];
1081
            s->mv[0][0][1] = s->last_mv[0][0][1];
1082
            s->mv[1][0][0] = s->last_mv[1][0][0];
1083
            s->mv[1][0][1] = s->last_mv[1][0][1];
1084

    
1085
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1086
                s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1087
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1088

    
1089
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1090
                s->mb_skiped = 1;
1091
        }
1092

    
1093
        return 0;
1094
    }
1095

    
1096
    switch(s->pict_type) {
1097
    default:
1098
    case I_TYPE:
1099
        if (get_bits1(&s->gb) == 0) {
1100
            if (get_bits1(&s->gb) == 0){
1101
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1102
                return -1;
1103
            }
1104
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1105
        } else {
1106
            mb_type = MB_TYPE_INTRA;
1107
        }
1108
        break;
1109
    case P_TYPE:
1110
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1111
        if (mb_type < 0){
1112
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1113
            return -1;
1114
        }
1115
        mb_type = ptype2mb_type[ mb_type ];
1116
        break;
1117
    case B_TYPE:
1118
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1119
        if (mb_type < 0){
1120
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1121
            return -1;
1122
        }
1123
        mb_type = btype2mb_type[ mb_type ];
1124
        break;
1125
    }
1126
    dprintf("mb_type=%x\n", mb_type);
1127
//    motion_type = 0; /* avoid warning */
1128
    if (IS_INTRA(mb_type)) {
1129
        /* compute dct type */
1130
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1131
            !s->frame_pred_frame_dct) {
1132
            s->interlaced_dct = get_bits1(&s->gb);
1133
        }
1134

    
1135
        if (IS_QUANT(mb_type))
1136
            s->qscale = get_qscale(s);
1137
        
1138
        if (s->concealment_motion_vectors) {
1139
            /* just parse them */
1140
            if (s->picture_structure != PICT_FRAME) 
1141
                skip_bits1(&s->gb); /* field select */
1142
            
1143
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1144
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1145
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1146
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1147

    
1148
            skip_bits1(&s->gb); /* marker */
1149
        }else
1150
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1151
        s->mb_intra = 1;
1152
#ifdef HAVE_XVMC
1153
        //one 1 we memcpy blocks in xvmcvideo
1154
        if(s->avctx->xvmc_acceleration > 1){
1155
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1156
            if(s->swap_uv){
1157
                exchange_uv(s);
1158
            }
1159
        }
1160
#endif
1161

    
1162
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1163
            for(i=0;i<mb_block_count;i++) {
1164
                if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1165
                    return -1;
1166
            }
1167
        } else {
1168
            for(i=0;i<6;i++) {
1169
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1170
                    return -1;
1171
            }
1172
        }
1173
    } else {
1174
        if (mb_type & MB_TYPE_ZERO_MV){
1175
            assert(mb_type & MB_TYPE_CBP);
1176

    
1177
            /* compute dct type */
1178
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1179
                !s->frame_pred_frame_dct) {
1180
                s->interlaced_dct = get_bits1(&s->gb);
1181
            }
1182

    
1183
            if (IS_QUANT(mb_type))
1184
                s->qscale = get_qscale(s);
1185

    
1186
            s->mv_dir = MV_DIR_FORWARD;
1187
            if(s->picture_structure == PICT_FRAME)
1188
                s->mv_type = MV_TYPE_16X16;
1189
            else{
1190
                s->mv_type = MV_TYPE_FIELD;
1191
                mb_type |= MB_TYPE_INTERLACED;
1192
                s->field_select[0][0]= s->picture_structure - 1;
1193
            }
1194
            s->last_mv[0][0][0] = 0;
1195
            s->last_mv[0][0][1] = 0;
1196
            s->last_mv[0][1][0] = 0;
1197
            s->last_mv[0][1][1] = 0;
1198
            s->mv[0][0][0] = 0;
1199
            s->mv[0][0][1] = 0;
1200
        }else{
1201
            assert(mb_type & MB_TYPE_L0L1);
1202
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1203
            /* get additionnal motion vector type */
1204
            if (s->frame_pred_frame_dct) 
1205
                motion_type = MT_FRAME;
1206
            else{
1207
                motion_type = get_bits(&s->gb, 2);
1208
            }
1209

    
1210
            /* compute dct type */
1211
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1212
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1213
                s->interlaced_dct = get_bits1(&s->gb);
1214
            }
1215

    
1216
            if (IS_QUANT(mb_type))
1217
                s->qscale = get_qscale(s);
1218

    
1219
            /* motion vectors */
1220
            s->mv_dir = 0;
1221
            for(i=0;i<2;i++) {
1222
                if (USES_LIST(mb_type, i)) {
1223
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1224
                    dprintf("motion_type=%d\n", motion_type);
1225
                    switch(motion_type) {
1226
                    case MT_FRAME: /* or MT_16X8 */
1227
                        if (s->picture_structure == PICT_FRAME) {
1228
                            /* MT_FRAME */
1229
                            mb_type |= MB_TYPE_16x16; 
1230
                            s->mv_type = MV_TYPE_16X16;
1231
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1232
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1233
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1234
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1235
                            /* full_pel: only for mpeg1 */
1236
                            if (s->full_pel[i]){
1237
                                s->mv[i][0][0] <<= 1;
1238
                                s->mv[i][0][1] <<= 1;
1239
                            }
1240
                        } else {
1241
                            /* MT_16X8 */
1242
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1243
                            s->mv_type = MV_TYPE_16X8;
1244
                            for(j=0;j<2;j++) {
1245
                                s->field_select[i][j] = get_bits1(&s->gb);
1246
                                for(k=0;k<2;k++) {
1247
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1248
                                                             s->last_mv[i][j][k]);
1249
                                    s->last_mv[i][j][k] = val;
1250
                                    s->mv[i][j][k] = val;
1251
                                }
1252
                            }
1253
                        }
1254
                        break;
1255
                    case MT_FIELD:
1256
                        s->mv_type = MV_TYPE_FIELD;
1257
                        if (s->picture_structure == PICT_FRAME) {
1258
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1259
                            for(j=0;j<2;j++) {
1260
                                s->field_select[i][j] = get_bits1(&s->gb);
1261
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1262
                                                         s->last_mv[i][j][0]);
1263
                                s->last_mv[i][j][0] = val;
1264
                                s->mv[i][j][0] = val;
1265
                                dprintf("fmx=%d\n", val);
1266
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1267
                                                         s->last_mv[i][j][1] >> 1);
1268
                                s->last_mv[i][j][1] = val << 1;
1269
                                s->mv[i][j][1] = val;
1270
                                dprintf("fmy=%d\n", val);
1271
                            }
1272
                        } else {
1273
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1274
                            s->field_select[i][0] = get_bits1(&s->gb);
1275
                            for(k=0;k<2;k++) {
1276
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1277
                                                         s->last_mv[i][0][k]);
1278
                                s->last_mv[i][0][k] = val;
1279
                                s->last_mv[i][1][k] = val;
1280
                                s->mv[i][0][k] = val;
1281
                            }
1282
                        }
1283
                        break;
1284
                    case MT_DMV:
1285
                        {
1286
                            int dmx, dmy, mx, my, m;
1287

    
1288
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1289
                                                    s->last_mv[i][0][0]);
1290
                            s->last_mv[i][0][0] = mx;
1291
                            s->last_mv[i][1][0] = mx;
1292
                            dmx = get_dmv(s);
1293
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1294
                                                    s->last_mv[i][0][1] >> 1);
1295
                            dmy = get_dmv(s);
1296
                            s->mv_type = MV_TYPE_DMV;
1297

    
1298

    
1299
                            s->last_mv[i][0][1] = my<<1;
1300
                            s->last_mv[i][1][1] = my<<1;
1301

    
1302
                            s->mv[i][0][0] = mx;
1303
                            s->mv[i][0][1] = my;
1304
                            s->mv[i][1][0] = mx;//not used
1305
                            s->mv[i][1][1] = my;//not used
1306

    
1307
                            if (s->picture_structure == PICT_FRAME) {
1308
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1309

    
1310
                                //m = 1 + 2 * s->top_field_first;
1311
                                m = s->top_field_first ? 1 : 3;
1312

    
1313
                                /* top -> top pred */
1314
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1315
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1316
                                m = 4 - m;
1317
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1318
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1319
                            } else {
1320
                                mb_type |= MB_TYPE_16x16;
1321

    
1322
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1323
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1324
                                if(s->picture_structure == PICT_TOP_FIELD)
1325
                                    s->mv[i][2][1]--;
1326
                                else 
1327
                                    s->mv[i][2][1]++;
1328
                            }
1329
                        }
1330
                        break;
1331
                    default:
1332
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1333
                        return -1;
1334
                    }
1335
                }
1336
            }
1337
        }
1338
        
1339
        s->mb_intra = 0;
1340

    
1341
        if (HAS_CBP(mb_type)) {
1342
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1343
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1344
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1345
                return -1;
1346
            }
1347
            if(mb_block_count > 6){
1348
                 cbp<<= mb_block_count-6;
1349
                 cbp |= get_bits(&s->gb, mb_block_count-6);
1350
            }
1351

    
1352
#ifdef HAVE_XVMC
1353
            //on 1 we memcpy blocks in xvmcvideo
1354
            if(s->avctx->xvmc_acceleration > 1){
1355
                XVMC_pack_pblocks(s,cbp);
1356
                if(s->swap_uv){
1357
                    exchange_uv(s);
1358
                }
1359
            }    
1360
#endif
1361

    
1362
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1363
                if(s->flags2 & CODEC_FLAG2_FAST){
1364
                    for(i=0;i<6;i++) {
1365
                        if(cbp & 32) {
1366
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1367
                        } else {
1368
                            s->block_last_index[i] = -1;
1369
                        }
1370
                        cbp+=cbp;
1371
                    }
1372
                }else{
1373
                    cbp<<= 12-mb_block_count;
1374
    
1375
                    for(i=0;i<mb_block_count;i++) {
1376
                        if ( cbp & (1<<11) ) {
1377
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1378
                                return -1;
1379
                        } else {
1380
                            s->block_last_index[i] = -1;
1381
                        }
1382
                        cbp+=cbp;
1383
                    }
1384
                }
1385
            } else {
1386
                if(s->flags2 & CODEC_FLAG2_FAST){
1387
                    for(i=0;i<6;i++) {
1388
                        if (cbp & 32) {
1389
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1390
                        } else {
1391
                            s->block_last_index[i] = -1;
1392
                        }
1393
                        cbp+=cbp;
1394
                    }
1395
                }else{
1396
                    for(i=0;i<6;i++) {
1397
                        if (cbp & 32) {
1398
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1399
                                return -1;
1400
                        } else {
1401
                            s->block_last_index[i] = -1;
1402
                        }
1403
                        cbp+=cbp;
1404
                    }
1405
                }
1406
            }
1407
        }else{
1408
            for(i=0;i<6;i++)
1409
                s->block_last_index[i] = -1;
1410
        }
1411
    }
1412

    
1413
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1414

    
1415
    return 0;
1416
}
1417

    
1418
/* as h263, but only 17 codes */
1419
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1420
{
1421
    int code, sign, val, l, shift;
1422

    
1423
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1424
    if (code == 0) {
1425
        return pred;
1426
    }
1427
    if (code < 0) {
1428
        return 0xffff;
1429
    }
1430

    
1431
    sign = get_bits1(&s->gb);
1432
    shift = fcode - 1;
1433
    val = code;
1434
    if (shift) {
1435
        val = (val - 1) << shift;
1436
        val |= get_bits(&s->gb, shift);
1437
        val++;
1438
    }
1439
    if (sign)
1440
        val = -val;
1441
    val += pred;
1442
    
1443
    /* modulo decoding */
1444
    l= INT_BIT - 5 - shift;
1445
    val = (val<<l)>>l;
1446
    return val;
1447
}
1448

    
1449
static inline int decode_dc(GetBitContext *gb, int component)
1450
{
1451
    int code, diff;
1452

    
1453
    if (component == 0) {
1454
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1455
    } else {
1456
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1457
    }
1458
    if (code < 0){
1459
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1460
        return 0xffff;
1461
    }
1462
    if (code == 0) {
1463
        diff = 0;
1464
    } else {
1465
        diff = get_xbits(gb, code);
1466
    }
1467
    return diff;
1468
}
1469

    
1470
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1471
                               DCTELEM *block, 
1472
                               int n)
1473
{
1474
    int level, dc, diff, i, j, run;
1475
    int component;
1476
    RLTable *rl = &rl_mpeg1;
1477
    uint8_t * const scantable= s->intra_scantable.permutated;
1478
    const uint16_t *quant_matrix= s->intra_matrix;
1479
    const int qscale= s->qscale;
1480

    
1481
    /* DC coef */
1482
    component = (n <= 3 ? 0 : n - 4 + 1);
1483
    diff = decode_dc(&s->gb, component);
1484
    if (diff >= 0xffff)
1485
        return -1;
1486
    dc = s->last_dc[component];
1487
    dc += diff;
1488
    s->last_dc[component] = dc;
1489
    block[0] = dc<<3;
1490
    dprintf("dc=%d diff=%d\n", dc, diff);
1491
    i = 0;
1492
    {
1493
        OPEN_READER(re, &s->gb);    
1494
        /* now quantify & encode AC coefs */
1495
        for(;;) {
1496
            UPDATE_CACHE(re, &s->gb);
1497
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1498
            
1499
            if(level == 127){
1500
                break;
1501
            } else if(level != 0) {
1502
                i += run;
1503
                j = scantable[i];
1504
                level= (level*qscale*quant_matrix[j])>>4;
1505
                level= (level-1)|1;
1506
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1507
                LAST_SKIP_BITS(re, &s->gb, 1);
1508
            } else {
1509
                /* escape */
1510
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1511
                UPDATE_CACHE(re, &s->gb);
1512
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1513
                if (level == -128) {
1514
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1515
                } else if (level == 0) {
1516
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1517
                }
1518
                i += run;
1519
                j = scantable[i];
1520
                if(level<0){
1521
                    level= -level;
1522
                    level= (level*qscale*quant_matrix[j])>>4;
1523
                    level= (level-1)|1;
1524
                    level= -level;
1525
                }else{
1526
                    level= (level*qscale*quant_matrix[j])>>4;
1527
                    level= (level-1)|1;
1528
                }
1529
            }
1530
            if (i > 63){
1531
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1532
                return -1;
1533
            }
1534

    
1535
            block[j] = level;
1536
        }
1537
        CLOSE_READER(re, &s->gb);
1538
    }
1539
    s->block_last_index[n] = i;
1540
   return 0;
1541
}
1542

    
1543
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1544
                               DCTELEM *block, 
1545
                               int n)
1546
{
1547
    int level, i, j, run;
1548
    RLTable *rl = &rl_mpeg1;
1549
    uint8_t * const scantable= s->intra_scantable.permutated;
1550
    const uint16_t *quant_matrix= s->inter_matrix;
1551
    const int qscale= s->qscale;
1552

    
1553
    {
1554
        int v;
1555
        OPEN_READER(re, &s->gb);
1556
        i = -1;
1557
        /* special case for the first coef. no need to add a second vlc table */
1558
        UPDATE_CACHE(re, &s->gb);
1559
        v= SHOW_UBITS(re, &s->gb, 2);
1560
        if (v & 2) {
1561
            LAST_SKIP_BITS(re, &s->gb, 2);
1562
            level= (3*qscale*quant_matrix[0])>>5;
1563
            level= (level-1)|1;
1564
            if(v&1)
1565
                level= -level;
1566
            block[0] = level;
1567
            i++;
1568
        }
1569

    
1570
        /* now quantify & encode AC coefs */
1571
        for(;;) {
1572
            UPDATE_CACHE(re, &s->gb);
1573
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1574
            
1575
            if(level == 127){
1576
                break;
1577
            } else if(level != 0) {
1578
                i += run;
1579
                j = scantable[i];
1580
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1581
                level= (level-1)|1;
1582
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1583
                LAST_SKIP_BITS(re, &s->gb, 1);
1584
            } else {
1585
                /* escape */
1586
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1587
                UPDATE_CACHE(re, &s->gb);
1588
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1589
                if (level == -128) {
1590
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1591
                } else if (level == 0) {
1592
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1593
                }
1594
                i += run;
1595
                j = scantable[i];
1596
                if(level<0){
1597
                    level= -level;
1598
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1599
                    level= (level-1)|1;
1600
                    level= -level;
1601
                }else{
1602
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1603
                    level= (level-1)|1;
1604
                }
1605
            }
1606
            if (i > 63){
1607
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1608
                return -1;
1609
            }
1610

    
1611
            block[j] = level;
1612
        }
1613
        CLOSE_READER(re, &s->gb);
1614
    }
1615
    s->block_last_index[n] = i;
1616
    return 0;
1617
}
1618

    
1619
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1620
{
1621
    int level, i, j, run;
1622
    RLTable *rl = &rl_mpeg1;
1623
    uint8_t * const scantable= s->intra_scantable.permutated;
1624
    const int qscale= s->qscale;
1625

    
1626
    {
1627
        int v;
1628
        OPEN_READER(re, &s->gb);
1629
        i = -1;
1630
        /* special case for the first coef. no need to add a second vlc table */
1631
        UPDATE_CACHE(re, &s->gb);
1632
        v= SHOW_UBITS(re, &s->gb, 2);
1633
        if (v & 2) {
1634
            LAST_SKIP_BITS(re, &s->gb, 2);
1635
            level= (3*qscale)>>1;
1636
            level= (level-1)|1;
1637
            if(v&1)
1638
                level= -level;
1639
            block[0] = level;
1640
            i++;
1641
        }
1642

    
1643
        /* now quantify & encode AC coefs */
1644
        for(;;) {
1645
            UPDATE_CACHE(re, &s->gb);
1646
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1647
            
1648
            if(level == 127){
1649
                break;
1650
            } else if(level != 0) {
1651
                i += run;
1652
                j = scantable[i];
1653
                level= ((level*2+1)*qscale)>>1;
1654
                level= (level-1)|1;
1655
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1656
                LAST_SKIP_BITS(re, &s->gb, 1);
1657
            } else {
1658
                /* escape */
1659
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1660
                UPDATE_CACHE(re, &s->gb);
1661
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1662
                if (level == -128) {
1663
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1664
                } else if (level == 0) {
1665
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1666
                }
1667
                i += run;
1668
                j = scantable[i];
1669
                if(level<0){
1670
                    level= -level;
1671
                    level= ((level*2+1)*qscale)>>1;
1672
                    level= (level-1)|1;
1673
                    level= -level;
1674
                }else{
1675
                    level= ((level*2+1)*qscale)>>1;
1676
                    level= (level-1)|1;
1677
                }
1678
            }
1679

    
1680
            block[j] = level;
1681
        }
1682
        CLOSE_READER(re, &s->gb);
1683
    }
1684
    s->block_last_index[n] = i;
1685
    return 0;
1686
}
1687

    
1688

    
1689
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1690
                               DCTELEM *block, 
1691
                               int n)
1692
{
1693
    int level, i, j, run;
1694
    RLTable *rl = &rl_mpeg1;
1695
    uint8_t * const scantable= s->intra_scantable.permutated;
1696
    const uint16_t *quant_matrix;
1697
    const int qscale= s->qscale;
1698
    int mismatch;
1699

    
1700
    mismatch = 1;
1701

    
1702
    {
1703
        int v;
1704
        OPEN_READER(re, &s->gb);
1705
        i = -1;
1706
        if (n < 4)
1707
            quant_matrix = s->inter_matrix;
1708
        else
1709
            quant_matrix = s->chroma_inter_matrix;
1710

    
1711
        /* special case for the first coef. no need to add a second vlc table */
1712
        UPDATE_CACHE(re, &s->gb);
1713
        v= SHOW_UBITS(re, &s->gb, 2);
1714
        if (v & 2) {
1715
            LAST_SKIP_BITS(re, &s->gb, 2);
1716
            level= (3*qscale*quant_matrix[0])>>5;
1717
            if(v&1)
1718
                level= -level;
1719
            block[0] = level;
1720
            mismatch ^= level;
1721
            i++;
1722
        }
1723

    
1724
        /* now quantify & encode AC coefs */
1725
        for(;;) {
1726
            UPDATE_CACHE(re, &s->gb);
1727
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1728
            
1729
            if(level == 127){
1730
                break;
1731
            } else if(level != 0) {
1732
                i += run;
1733
                j = scantable[i];
1734
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1735
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1736
                LAST_SKIP_BITS(re, &s->gb, 1);
1737
            } else {
1738
                /* escape */
1739
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1740
                UPDATE_CACHE(re, &s->gb);
1741
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1742

    
1743
                i += run;
1744
                j = scantable[i];
1745
                if(level<0){
1746
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1747
                    level= -level;
1748
                }else{
1749
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1750
                }
1751
            }
1752
            if (i > 63){
1753
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1754
                return -1;
1755
            }
1756
            
1757
            mismatch ^= level;
1758
            block[j] = level;
1759
        }
1760
        CLOSE_READER(re, &s->gb);
1761
    }
1762
    block[63] ^= (mismatch & 1);
1763
    
1764
    s->block_last_index[n] = i;
1765
    return 0;
1766
}
1767

    
1768
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, 
1769
                               DCTELEM *block, 
1770
                               int n)
1771
{
1772
    int level, i, j, run;
1773
    RLTable *rl = &rl_mpeg1;
1774
    uint8_t * const scantable= s->intra_scantable.permutated;
1775
    const int qscale= s->qscale;
1776
    int v;
1777
    OPEN_READER(re, &s->gb);
1778
    i = -1;
1779

    
1780
    /* special case for the first coef. no need to add a second vlc table */
1781
    UPDATE_CACHE(re, &s->gb);
1782
    v= SHOW_UBITS(re, &s->gb, 2);
1783
    if (v & 2) {
1784
        LAST_SKIP_BITS(re, &s->gb, 2);
1785
        level= (3*qscale)>>1;
1786
        if(v&1)
1787
            level= -level;
1788
        block[0] = level;
1789
        i++;
1790
    }
1791

    
1792
    /* now quantify & encode AC coefs */
1793
    for(;;) {
1794
        UPDATE_CACHE(re, &s->gb);
1795
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1796
        
1797
        if(level == 127){
1798
            break;
1799
        } else if(level != 0) {
1800
            i += run;
1801
            j = scantable[i];
1802
            level= ((level*2+1)*qscale)>>1;
1803
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1804
            LAST_SKIP_BITS(re, &s->gb, 1);
1805
        } else {
1806
            /* escape */
1807
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1808
            UPDATE_CACHE(re, &s->gb);
1809
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1810

    
1811
            i += run;
1812
            j = scantable[i];
1813
            if(level<0){
1814
                level= ((-level*2+1)*qscale)>>1;
1815
                level= -level;
1816
            }else{
1817
                level= ((level*2+1)*qscale)>>1;
1818
            }
1819
        }
1820
        
1821
        block[j] = level;
1822
    }
1823
    CLOSE_READER(re, &s->gb);
1824
    s->block_last_index[n] = i;
1825
    return 0;
1826
}
1827

    
1828

    
1829
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1830
                               DCTELEM *block, 
1831
                               int n)
1832
{
1833
    int level, dc, diff, i, j, run;
1834
    int component;
1835
    RLTable *rl;
1836
    uint8_t * const scantable= s->intra_scantable.permutated;
1837
    const uint16_t *quant_matrix;
1838
    const int qscale= s->qscale;
1839
    int mismatch;
1840

    
1841
    /* DC coef */
1842
    if (n < 4){
1843
        quant_matrix = s->intra_matrix;
1844
        component = 0; 
1845
    }else{
1846
        quant_matrix = s->chroma_intra_matrix;
1847
        component = (n&1) + 1;
1848
    }
1849
    diff = decode_dc(&s->gb, component);
1850
    if (diff >= 0xffff)
1851
        return -1;
1852
    dc = s->last_dc[component];
1853
    dc += diff;
1854
    s->last_dc[component] = dc;
1855
    block[0] = dc << (3 - s->intra_dc_precision);
1856
    dprintf("dc=%d\n", block[0]);
1857
    mismatch = block[0] ^ 1;
1858
    i = 0;
1859
    if (s->intra_vlc_format)
1860
        rl = &rl_mpeg2;
1861
    else
1862
        rl = &rl_mpeg1;
1863

    
1864
    {
1865
        OPEN_READER(re, &s->gb);    
1866
        /* now quantify & encode AC coefs */
1867
        for(;;) {
1868
            UPDATE_CACHE(re, &s->gb);
1869
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1870
            
1871
            if(level == 127){
1872
                break;
1873
            } else if(level != 0) {
1874
                i += run;
1875
                j = scantable[i];
1876
                level= (level*qscale*quant_matrix[j])>>4;
1877
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1878
                LAST_SKIP_BITS(re, &s->gb, 1);
1879
            } else {
1880
                /* escape */
1881
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1882
                UPDATE_CACHE(re, &s->gb);
1883
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1884
                i += run;
1885
                j = scantable[i];
1886
                if(level<0){
1887
                    level= (-level*qscale*quant_matrix[j])>>4;
1888
                    level= -level;
1889
                }else{
1890
                    level= (level*qscale*quant_matrix[j])>>4;
1891
                }
1892
            }
1893
            if (i > 63){
1894
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1895
                return -1;
1896
            }
1897
            
1898
            mismatch^= level;
1899
            block[j] = level;
1900
        }
1901
        CLOSE_READER(re, &s->gb);
1902
    }
1903
    block[63]^= mismatch&1;
1904
    
1905
    s->block_last_index[n] = i;
1906
    return 0;
1907
}
1908

    
1909
typedef struct Mpeg1Context {
1910
    MpegEncContext mpeg_enc_ctx;
1911
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1912
    int repeat_field; /* true if we must repeat the field */
1913
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1914
    int slice_count;
1915
    int swap_uv;//indicate VCR2
1916
    int save_aspect_info;
1917
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1918

    
1919
} Mpeg1Context;
1920

    
1921
static int mpeg_decode_init(AVCodecContext *avctx)
1922
{
1923
    Mpeg1Context *s = avctx->priv_data;
1924
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1925
    int i;
1926
    
1927
    //we need some parmutation to store
1928
    //matrixes, until MPV_common_init()
1929
    //set the real permutatuon 
1930
    for(i=0;i<64;i++)
1931
       s2->dsp.idct_permutation[i]=i;
1932

    
1933
    MPV_decode_defaults(s2);
1934
    
1935
    s->mpeg_enc_ctx.avctx= avctx;
1936
    s->mpeg_enc_ctx.flags= avctx->flags;
1937
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1938
    common_init(&s->mpeg_enc_ctx);
1939
    init_vlcs();
1940

    
1941
    s->mpeg_enc_ctx_allocated = 0;
1942
    s->mpeg_enc_ctx.picture_number = 0;
1943
    s->repeat_field = 0;
1944
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1945
    return 0;
1946
}
1947

    
1948
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, 
1949
                                     const uint8_t *new_perm){
1950
    uint16_t temp_matrix[64];
1951
    int i;
1952

    
1953
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1954
    
1955
    for(i=0;i<64;i++){
1956
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1957
    }      
1958
}
1959

    
1960
//Call this function when we know all parameters
1961
//it may be called in different places for mpeg1 and mpeg2
1962
static int mpeg_decode_postinit(AVCodecContext *avctx){
1963
    Mpeg1Context *s1 = avctx->priv_data;
1964
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1965
    uint8_t old_permutation[64];
1966

    
1967
    if (
1968
            (s1->mpeg_enc_ctx_allocated == 0)|| 
1969
        avctx->width  != s->width ||
1970
        avctx->height != s->height||
1971
//      s1->save_aspect_info != avctx->aspect_ratio_info||
1972
        0)
1973
    {
1974
    
1975
        if (s1->mpeg_enc_ctx_allocated) {
1976
            MPV_common_end(s);
1977
        }
1978

    
1979
        if( (s->width == 0 )||(s->height == 0))
1980
            return -2;
1981

    
1982
        avctx->width = s->width;
1983
        avctx->height = s->height;
1984
        avctx->bit_rate = s->bit_rate;
1985
        s1->save_aspect_info = s->aspect_ratio_info;
1986

    
1987
     //low_delay may be forced, in this case we will have B frames
1988
     //that behave like P frames
1989
        avctx->has_b_frames = !(s->low_delay);
1990

    
1991
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1992
            //mpeg1 fps
1993
            avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
1994
            avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
1995
            //mpeg1 aspect
1996
            avctx->sample_aspect_ratio= av_d2q(
1997
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
1998

    
1999
        }else{//mpeg2
2000
        //mpeg2 fps
2001
            av_reduce(
2002
                &s->avctx->frame_rate, 
2003
                &s->avctx->frame_rate_base, 
2004
                frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2005
                frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2006
                1<<30);
2007
        //mpeg2 aspect
2008
            if(s->aspect_ratio_info > 1){
2009
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2010
                    s->avctx->sample_aspect_ratio= 
2011
                        av_div_q(
2012
                         mpeg2_aspect[s->aspect_ratio_info], 
2013
                         (AVRational){s->width, s->height}
2014
                         );
2015
                }else{
2016
                    s->avctx->sample_aspect_ratio= 
2017
                        av_div_q(
2018
                         mpeg2_aspect[s->aspect_ratio_info], 
2019
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2020
                        );
2021
                }
2022
            }else{
2023
                s->avctx->sample_aspect_ratio= 
2024
                    mpeg2_aspect[s->aspect_ratio_info];
2025
            }
2026
        }//mpeg2
2027

    
2028
        if(avctx->xvmc_acceleration){
2029
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2030
        }else{
2031
            if(s->chroma_format <  2){
2032
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2033
            }else
2034
            if(s->chroma_format == 2){
2035
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2036
            }else
2037
            if(s->chroma_format >  2){
2038
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2039
            }
2040
        }
2041
        //until then pix_fmt may be changed right after codec init
2042
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2043
            if( avctx->idct_algo == FF_IDCT_AUTO )
2044
                avctx->idct_algo = FF_IDCT_SIMPLE;
2045

    
2046
        //quantization matrixes may need reordering 
2047
        //if dct permutation is changed
2048
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2049

    
2050
        if (MPV_common_init(s) < 0)
2051
            return -2;
2052

    
2053
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2054
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2055
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2056
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2057

    
2058
        s1->mpeg_enc_ctx_allocated = 1;
2059
    }
2060
    return 0;
2061
}
2062

    
2063
/* return the 8 bit start code value and update the search
2064
   state. Return -1 if no start code found */
2065
static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
2066
{
2067
    const uint8_t *buf_ptr= *pbuf_ptr;
2068

    
2069
    buf_ptr++; //gurantees that -1 is within the array
2070
    buf_end -= 2; // gurantees that +2 is within the array
2071

    
2072
    while (buf_ptr < buf_end) {
2073
        if(*buf_ptr==0){
2074
            while(buf_ptr < buf_end && buf_ptr[1]==0)
2075
                buf_ptr++;
2076

    
2077
            if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
2078
                *pbuf_ptr = buf_ptr+3;
2079
                return buf_ptr[2] + 0x100;
2080
            }
2081
        }
2082
        buf_ptr += 2;
2083
    }
2084
    buf_end += 2; //undo the hack above
2085
    
2086
    *pbuf_ptr = buf_end;
2087
    return -1;
2088
}
2089

    
2090
static int mpeg1_decode_picture(AVCodecContext *avctx, 
2091
                                const uint8_t *buf, int buf_size)
2092
{
2093
    Mpeg1Context *s1 = avctx->priv_data;
2094
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2095
    int ref, f_code, vbv_delay;
2096

    
2097
    if(mpeg_decode_postinit(s->avctx) < 0) 
2098
       return -2;
2099

    
2100
    init_get_bits(&s->gb, buf, buf_size*8);
2101

    
2102
    ref = get_bits(&s->gb, 10); /* temporal ref */
2103
    s->pict_type = get_bits(&s->gb, 3);
2104

    
2105
    vbv_delay= get_bits(&s->gb, 16);
2106
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2107
        s->full_pel[0] = get_bits1(&s->gb);
2108
        f_code = get_bits(&s->gb, 3);
2109
        if (f_code == 0)
2110
            return -1;
2111
        s->mpeg_f_code[0][0] = f_code;
2112
        s->mpeg_f_code[0][1] = f_code;
2113
    }
2114
    if (s->pict_type == B_TYPE) {
2115
        s->full_pel[1] = get_bits1(&s->gb);
2116
        f_code = get_bits(&s->gb, 3);
2117
        if (f_code == 0)
2118
            return -1;
2119
        s->mpeg_f_code[1][0] = f_code;
2120
        s->mpeg_f_code[1][1] = f_code;
2121
    }
2122
    s->current_picture.pict_type= s->pict_type;
2123
    s->current_picture.key_frame= s->pict_type == I_TYPE;
2124
    
2125
//    if(avctx->debug & FF_DEBUG_PICT_INFO)
2126
//        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
2127
    
2128
    s->y_dc_scale = 8;
2129
    s->c_dc_scale = 8;
2130
    s->first_slice = 1;
2131
    return 0;
2132
}
2133

    
2134
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2135
{
2136
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2137
    int horiz_size_ext, vert_size_ext;
2138
    int bit_rate_ext;
2139

    
2140
    skip_bits(&s->gb, 1); /* profil and level esc*/
2141
    s->avctx->profile= get_bits(&s->gb, 3);
2142
    s->avctx->level= get_bits(&s->gb, 4);
2143
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2144
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2145
    horiz_size_ext = get_bits(&s->gb, 2);
2146
    vert_size_ext = get_bits(&s->gb, 2);
2147
    s->width |= (horiz_size_ext << 12);
2148
    s->height |= (vert_size_ext << 12);
2149
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2150
    s->bit_rate += (bit_rate_ext << 12) * 400;
2151
    skip_bits1(&s->gb); /* marker */
2152
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2153

    
2154
    s->low_delay = get_bits1(&s->gb);
2155
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2156

    
2157
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2158
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2159

    
2160
    dprintf("sequence extension\n");
2161
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2162
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
2163

    
2164
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2165
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
2166
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2167

    
2168
}
2169

    
2170
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2171
{
2172
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2173
    int color_description, w, h;
2174

    
2175
    skip_bits(&s->gb, 3); /* video format */
2176
    color_description= get_bits1(&s->gb);
2177
    if(color_description){
2178
        skip_bits(&s->gb, 8); /* color primaries */
2179
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2180
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2181
    }
2182
    w= get_bits(&s->gb, 14);
2183
    skip_bits(&s->gb, 1); //marker
2184
    h= get_bits(&s->gb, 14);
2185
    skip_bits(&s->gb, 1); //marker
2186
    
2187
    s1->pan_scan.width= 16*w;
2188
    s1->pan_scan.height=16*h;
2189
        
2190
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2191
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2192
}
2193

    
2194
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2195
{
2196
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2197
    int i,nofco;
2198

    
2199
    nofco = 1;
2200
    if(s->progressive_sequence){
2201
        if(s->repeat_first_field){
2202
            nofco++;
2203
            if(s->top_field_first)
2204
                nofco++;        
2205
        }
2206
    }else{
2207
        if(s->picture_structure == PICT_FRAME){
2208
            nofco++;
2209
            if(s->repeat_first_field)
2210
                nofco++;
2211
        }
2212
    }
2213
    for(i=0; i<nofco; i++){
2214
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2215
        skip_bits(&s->gb, 1); //marker
2216
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2217
        skip_bits(&s->gb, 1); //marker
2218
    }
2219
   
2220
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2221
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
2222
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
2223
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
2224
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2225
        );
2226
}
2227

    
2228
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2229
{
2230
    int i, v, j;
2231

    
2232
    dprintf("matrix extension\n");
2233

    
2234
    if (get_bits1(&s->gb)) {
2235
        for(i=0;i<64;i++) {
2236
            v = get_bits(&s->gb, 8);
2237
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2238
            s->intra_matrix[j] = v;
2239
            s->chroma_intra_matrix[j] = v;
2240
        }
2241
    }
2242
    if (get_bits1(&s->gb)) {
2243
        for(i=0;i<64;i++) {
2244
            v = get_bits(&s->gb, 8);
2245
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2246
            s->inter_matrix[j] = v;
2247
            s->chroma_inter_matrix[j] = v;
2248
        }
2249
    }
2250
    if (get_bits1(&s->gb)) {
2251
        for(i=0;i<64;i++) {
2252
            v = get_bits(&s->gb, 8);
2253
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2254
            s->chroma_intra_matrix[j] = v;
2255
        }
2256
    }
2257
    if (get_bits1(&s->gb)) {
2258
        for(i=0;i<64;i++) {
2259
            v = get_bits(&s->gb, 8);
2260
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2261
            s->chroma_inter_matrix[j] = v;
2262
        }
2263
    }
2264
}
2265

    
2266
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2267
{
2268
    s->full_pel[0] = s->full_pel[1] = 0;
2269
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2270
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2271
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2272
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2273
    s->intra_dc_precision = get_bits(&s->gb, 2);
2274
    s->picture_structure = get_bits(&s->gb, 2);
2275
    s->top_field_first = get_bits1(&s->gb);
2276
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2277
    s->concealment_motion_vectors = get_bits1(&s->gb);
2278
    s->q_scale_type = get_bits1(&s->gb);
2279
    s->intra_vlc_format = get_bits1(&s->gb);
2280
    s->alternate_scan = get_bits1(&s->gb);
2281
    s->repeat_first_field = get_bits1(&s->gb);
2282
    s->chroma_420_type = get_bits1(&s->gb);
2283
    s->progressive_frame = get_bits1(&s->gb);
2284

    
2285
    if(s->picture_structure == PICT_FRAME)
2286
        s->first_field=0;
2287
    else{
2288
        s->first_field ^= 1;
2289
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2290
    }
2291
    
2292
    if(s->alternate_scan){
2293
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2294
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2295
    }else{
2296
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2297
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2298
    }
2299
    
2300
    /* composite display not parsed */
2301
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2302
    dprintf("picture_structure=%d\n", s->picture_structure);
2303
    dprintf("top field first=%d\n", s->top_field_first);
2304
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2305
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2306
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2307
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2308
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2309
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2310
}
2311

    
2312
static void mpeg_decode_extension(AVCodecContext *avctx, 
2313
                                  const uint8_t *buf, int buf_size)
2314
{
2315
    Mpeg1Context *s1 = avctx->priv_data;
2316
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2317
    int ext_type;
2318

    
2319
    init_get_bits(&s->gb, buf, buf_size*8);
2320
    
2321
    ext_type = get_bits(&s->gb, 4);
2322
    switch(ext_type) {
2323
    case 0x1:
2324
        mpeg_decode_sequence_extension(s1);
2325
        break;
2326
    case 0x2:
2327
        mpeg_decode_sequence_display_extension(s1);
2328
        break;
2329
    case 0x3:
2330
        mpeg_decode_quant_matrix_extension(s);
2331
        break;
2332
    case 0x7:
2333
        mpeg_decode_picture_display_extension(s1);
2334
        break;
2335
    case 0x8:
2336
        mpeg_decode_picture_coding_extension(s);
2337
        break;
2338
    }
2339
}
2340

    
2341
static void exchange_uv(MpegEncContext *s){
2342
    short * tmp = s->pblocks[4];
2343
    s->pblocks[4] = s->pblocks[5];
2344
    s->pblocks[5] = tmp;
2345
}
2346

    
2347
static int mpeg_field_start(MpegEncContext *s){
2348
    AVCodecContext *avctx= s->avctx;
2349
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2350

    
2351
    /* start frame decoding */
2352
    if(s->first_field || s->picture_structure==PICT_FRAME){
2353
        if(MPV_frame_start(s, avctx) < 0)
2354
            return -1;
2355

    
2356
        ff_er_frame_start(s);
2357

    
2358
        /* first check if we must repeat the frame */
2359
        s->current_picture_ptr->repeat_pict = 0;
2360
        if (s->repeat_first_field) {
2361
            if (s->progressive_sequence) {
2362
                if (s->top_field_first)
2363
                    s->current_picture_ptr->repeat_pict = 4;
2364
                else
2365
                    s->current_picture_ptr->repeat_pict = 2;
2366
            } else if (s->progressive_frame) {
2367
                s->current_picture_ptr->repeat_pict = 1;
2368
            }
2369
        }         
2370

    
2371
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2372
    }else{ //second field
2373
            int i;
2374
            
2375
            if(!s->current_picture_ptr){
2376
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2377
                return -1;
2378
            }
2379
            
2380
            for(i=0; i<4; i++){
2381
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2382
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2383
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2384
                } 
2385
            }
2386
    }
2387
#ifdef HAVE_XVMC
2388
// MPV_frame_start will call this function too,
2389
// but we need to call it on every field
2390
    if(s->avctx->xvmc_acceleration)
2391
         XVMC_field_start(s,avctx);
2392
#endif
2393

    
2394
    return 0;
2395
}
2396

    
2397
#define DECODE_SLICE_ERROR -1
2398
#define DECODE_SLICE_OK 0
2399

    
2400
/**
2401
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2402
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2403
 *         DECODE_SLICE_OK if this slice is ok<br>
2404
 */
2405
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2406
                             const uint8_t **buf, int buf_size)
2407
{
2408
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2409
    AVCodecContext *avctx= s->avctx;
2410
    int ret;
2411
    const int field_pic= s->picture_structure != PICT_FRAME;
2412
    const int lowres= s->avctx->lowres;
2413

    
2414
    s->resync_mb_x=
2415
    s->resync_mb_y= -1;
2416

    
2417
    if (mb_y<<field_pic >= s->mb_height){
2418
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2419
        return -1;
2420
    }
2421
    
2422
    init_get_bits(&s->gb, *buf, buf_size*8);
2423

    
2424
    ff_mpeg1_clean_buffers(s);
2425
    s->interlaced_dct = 0;
2426

    
2427
    s->qscale = get_qscale(s);
2428

    
2429
    if(s->qscale == 0){
2430
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2431
        return -1;
2432
    }
2433
    
2434
    /* extra slice info */
2435
    while (get_bits1(&s->gb) != 0) {
2436
        skip_bits(&s->gb, 8);
2437
    }
2438
    
2439
    s->mb_x=0;
2440

    
2441
    for(;;) {
2442
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2443
        if (code < 0){
2444
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2445
            return -1;
2446
        }
2447
        if (code >= 33) {
2448
            if (code == 33) {
2449
                s->mb_x += 33;
2450
            }
2451
            /* otherwise, stuffing, nothing to do */
2452
        } else {
2453
            s->mb_x += code;
2454
            break;
2455
        }
2456
    }
2457

    
2458
    s->resync_mb_x= s->mb_x;
2459
    s->resync_mb_y= s->mb_y= mb_y;
2460
    s->mb_skip_run= 0;
2461
    ff_init_block_index(s);
2462

    
2463
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2464
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2465
             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", 
2466
                 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],
2467
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2468
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2469
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2470
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2471
        }
2472
    }    
2473
    
2474
    for(;;) {
2475
#ifdef HAVE_XVMC
2476
        //one 1 we memcpy blocks in xvmcvideo
2477
        if(s->avctx->xvmc_acceleration > 1)
2478
            XVMC_init_block(s);//set s->block
2479
#endif
2480

    
2481
        s->dsp.clear_blocks(s->block[0]);
2482
        if(!s->chroma_y_shift){
2483
            s->dsp.clear_blocks(s->block[6]);
2484
        }
2485
        ret = mpeg_decode_mb(s, s->block);
2486
        s->chroma_qscale= s->qscale;
2487

    
2488
        dprintf("ret=%d\n", ret);
2489
        if (ret < 0)
2490
            return -1;
2491

    
2492
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2493
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2494
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2495
            int motion_x, motion_y, dir, i;
2496
            if(field_pic && !s->first_field)
2497
                xy += wrap/2;
2498

    
2499
            for(i=0; i<2; i++){
2500
                for(dir=0; dir<2; dir++){
2501
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2502
                        motion_x = motion_y = 0;
2503
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2504
                        motion_x = s->mv[dir][0][0];
2505
                        motion_y = s->mv[dir][0][1];
2506
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2507
                        motion_x = s->mv[dir][i][0];
2508
                        motion_y = s->mv[dir][i][1];
2509
                    }
2510

    
2511
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2512
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2513
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2514
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2515
                    s->current_picture.ref_index [dir][xy    ]=
2516
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2517
                }
2518
                xy += wrap;
2519
            }
2520
        }
2521

    
2522
        s->dest[0] += 16 >> lowres;
2523
        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2524
        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2525

    
2526
        MPV_decode_mb(s, s->block);
2527
        
2528
        if (++s->mb_x >= s->mb_width) {
2529

    
2530
            ff_draw_horiz_band(s, 16*s->mb_y, 16);
2531

    
2532
            s->mb_x = 0;
2533
            s->mb_y++;
2534

    
2535
            if(s->mb_y<<field_pic >= s->mb_height){
2536
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2537

    
2538
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2539
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2540
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2541
                    return -1;
2542
                }else
2543
                    goto eos;
2544
            }
2545
            
2546
            ff_init_block_index(s);
2547
        }
2548

    
2549
        /* skip mb handling */
2550
        if (s->mb_skip_run == -1) {
2551
            /* read again increment */
2552
            s->mb_skip_run = 0;
2553
            for(;;) {
2554
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2555
                if (code < 0){
2556
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2557
                    return -1;
2558
                }
2559
                if (code >= 33) {
2560
                    if (code == 33) {
2561
                        s->mb_skip_run += 33;
2562
                    }else if(code == 35){
2563
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2564
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2565
                            return -1;
2566
                        }
2567
                        goto eos; /* end of slice */
2568
                    }
2569
                    /* otherwise, stuffing, nothing to do */
2570
                } else {
2571
                    s->mb_skip_run += code;
2572
                    break;
2573
                }
2574
            }
2575
        }
2576
    }
2577
eos: // end of slice
2578
    *buf += get_bits_count(&s->gb)/8 - 1;
2579
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2580
    return 0;
2581
}
2582

    
2583
static int slice_decode_thread(AVCodecContext *c, void *arg){
2584
    MpegEncContext *s= arg;
2585
    const uint8_t *buf= s->gb.buffer;
2586
    int mb_y= s->start_mb_y;
2587

    
2588
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2589

    
2590
    for(;;){
2591
        int start_code, ret;
2592

    
2593
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2594
        emms_c();
2595
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2596
//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);
2597
        if(ret < 0){
2598
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2599
                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);
2600
        }else{
2601
            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);
2602
        }
2603
        
2604
        if(s->mb_y == s->end_mb_y)
2605
            return 0;
2606
        
2607
        start_code = find_start_code(&buf, s->gb.buffer_end);
2608
        mb_y= start_code - SLICE_MIN_START_CODE;
2609
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2610
            return -1;
2611
    }
2612
    
2613
    return 0; //not reached
2614
}
2615

    
2616
/**
2617
 * handles slice ends.
2618
 * @return 1 if it seems to be the last slice of 
2619
 */
2620
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2621
{
2622
    Mpeg1Context *s1 = avctx->priv_data;
2623
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2624
       
2625
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2626
        return 0;
2627

    
2628
#ifdef HAVE_XVMC
2629
    if(s->avctx->xvmc_acceleration)
2630
        XVMC_field_end(s);
2631
#endif
2632
    /* end of slice reached */
2633
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2634
        /* end of image */
2635

    
2636
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2637

    
2638
        ff_er_frame_end(s);
2639

    
2640
        MPV_frame_end(s);
2641

    
2642
        if (s->pict_type == B_TYPE || s->low_delay) {
2643
            *pict= *(AVFrame*)s->current_picture_ptr;
2644
            ff_print_debug_info(s, pict);
2645
        } else {
2646
            s->picture_number++;
2647
            /* latency of 1 frame for I and P frames */
2648
            /* XXX: use another variable than picture_number */
2649
            if (s->last_picture_ptr != NULL) {
2650
                *pict= *(AVFrame*)s->last_picture_ptr;
2651
                 ff_print_debug_info(s, pict);
2652
            }
2653
        }
2654

    
2655
        return 1;
2656
    } else {
2657
        return 0;
2658
    }
2659
}
2660

    
2661
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2662
                                 const uint8_t *buf, int buf_size)
2663
{
2664
    Mpeg1Context *s1 = avctx->priv_data;
2665
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2666
    int width,height;
2667
    int i, v, j;
2668

    
2669
    init_get_bits(&s->gb, buf, buf_size*8);
2670

    
2671
    width = get_bits(&s->gb, 12);
2672
    height = get_bits(&s->gb, 12);
2673
    if (width <= 0 || height <= 0 ||
2674
        (width % 2) != 0 || (height % 2) != 0)
2675
        return -1;
2676
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2677
    if (s->aspect_ratio_info == 0)
2678
        return -1;
2679
    s->frame_rate_index = get_bits(&s->gb, 4);
2680
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2681
        return -1;
2682
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2683
    if (get_bits1(&s->gb) == 0) /* marker */
2684
        return -1;
2685
    s->width = width;
2686
    s->height = height;
2687

    
2688
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2689
    skip_bits(&s->gb, 1);
2690

    
2691
    /* get matrix */
2692
    if (get_bits1(&s->gb)) {
2693
        for(i=0;i<64;i++) {
2694
            v = get_bits(&s->gb, 8);
2695
            if(v==0){
2696
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2697
                return -1;
2698
            }
2699
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2700
            s->intra_matrix[j] = v;
2701
            s->chroma_intra_matrix[j] = v;
2702
        }
2703
#ifdef DEBUG
2704
        dprintf("intra matrix present\n");
2705
        for(i=0;i<64;i++)
2706
            dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]);
2707
        printf("\n");
2708
#endif
2709
    } else {
2710
        for(i=0;i<64;i++) {
2711
            j = s->dsp.idct_permutation[i];
2712
            v = ff_mpeg1_default_intra_matrix[i];
2713
            s->intra_matrix[j] = v;
2714
            s->chroma_intra_matrix[j] = v;
2715
        }
2716
    }
2717
    if (get_bits1(&s->gb)) {
2718
        for(i=0;i<64;i++) {
2719
            v = get_bits(&s->gb, 8);
2720
            if(v==0){
2721
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2722
                return -1;
2723
            }
2724
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2725
            s->inter_matrix[j] = v;
2726
            s->chroma_inter_matrix[j] = v;
2727
        }
2728
#ifdef DEBUG
2729
        dprintf("non intra matrix present\n");
2730
        for(i=0;i<64;i++)
2731
            dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]);
2732
        printf("\n");
2733
#endif
2734
    } else {
2735
        for(i=0;i<64;i++) {
2736
            int j= s->dsp.idct_permutation[i];
2737
            v = ff_mpeg1_default_non_intra_matrix[i];
2738
            s->inter_matrix[j] = v;
2739
            s->chroma_inter_matrix[j] = v;
2740
        }
2741
    }
2742
    
2743
    if(show_bits(&s->gb, 23) != 0){
2744
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2745
        return -1;
2746
    }
2747

    
2748
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2749
    s->progressive_sequence = 1;
2750
    s->progressive_frame = 1;
2751
    s->picture_structure = PICT_FRAME;
2752
    s->frame_pred_frame_dct = 1;
2753
    s->chroma_format = 1;
2754
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2755
    avctx->sub_id = 1; /* indicates mpeg1 */
2756
    s->out_format = FMT_MPEG1;
2757
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2758
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2759
    
2760
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2761
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2762
               s->avctx->rc_buffer_size, s->bit_rate);
2763
    
2764
    return 0;
2765
}
2766

    
2767
static int vcr2_init_sequence(AVCodecContext *avctx)
2768
{
2769
    Mpeg1Context *s1 = avctx->priv_data;
2770
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2771
    int i, v;
2772

    
2773
    /* start new mpeg1 context decoding */
2774
    s->out_format = FMT_MPEG1;
2775
    if (s1->mpeg_enc_ctx_allocated) {
2776
        MPV_common_end(s);
2777
    }
2778
    s->width = avctx->width;
2779
    s->height = avctx->height;
2780
    avctx->has_b_frames= 0; //true?
2781
    s->low_delay= 1;
2782

    
2783
    if(avctx->xvmc_acceleration){
2784
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2785
    }else{
2786
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2787
    }
2788

    
2789
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2790
        if( avctx->idct_algo == FF_IDCT_AUTO )
2791
            avctx->idct_algo = FF_IDCT_SIMPLE;
2792
    
2793
    if (MPV_common_init(s) < 0)
2794
        return -1;
2795
    exchange_uv(s);//common init reset pblocks, so we swap them here
2796
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2797
    s1->mpeg_enc_ctx_allocated = 1;
2798

    
2799
    for(i=0;i<64;i++) {
2800
        int j= s->dsp.idct_permutation[i];
2801
        v = ff_mpeg1_default_intra_matrix[i];
2802
        s->intra_matrix[j] = v;
2803
        s->chroma_intra_matrix[j] = v;
2804

    
2805
        v = ff_mpeg1_default_non_intra_matrix[i];
2806
        s->inter_matrix[j] = v;
2807
        s->chroma_inter_matrix[j] = v;
2808
    }
2809

    
2810
    s->progressive_sequence = 1;
2811
    s->progressive_frame = 1;
2812
    s->picture_structure = PICT_FRAME;
2813
    s->frame_pred_frame_dct = 1;
2814
    s->chroma_format = 1;
2815
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2816
    avctx->sub_id = 2; /* indicates mpeg2 */
2817
    return 0;
2818
}
2819

    
2820

    
2821
static void mpeg_decode_user_data(AVCodecContext *avctx, 
2822
                                  const uint8_t *buf, int buf_size)
2823
{
2824
    const uint8_t *p;
2825
    int len, flags;
2826
    p = buf;
2827
    len = buf_size;
2828

    
2829
    /* we parse the DTG active format information */
2830
    if (len >= 5 &&
2831
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2832
        flags = p[4];
2833
        p += 5;
2834
        len -= 5;
2835
        if (flags & 0x80) {
2836
            /* skip event id */
2837
            if (len < 2)
2838
                return;
2839
            p += 2;
2840
            len -= 2;
2841
        }
2842
        if (flags & 0x40) {
2843
            if (len < 1)
2844
                return;
2845
            avctx->dtg_active_format = p[0] & 0x0f;
2846
        }
2847
    }
2848
}
2849

    
2850
static void mpeg_decode_gop(AVCodecContext *avctx, 
2851
                            const uint8_t *buf, int buf_size){
2852
    Mpeg1Context *s1 = avctx->priv_data;
2853
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2854

    
2855
    int drop_frame_flag;
2856
    int time_code_hours, time_code_minutes;
2857
    int time_code_seconds, time_code_pictures;
2858
    int broken_link;
2859

    
2860
    init_get_bits(&s->gb, buf, buf_size*8);
2861

    
2862
    drop_frame_flag = get_bits1(&s->gb);
2863
    
2864
    time_code_hours=get_bits(&s->gb,5);
2865
    time_code_minutes = get_bits(&s->gb,6);
2866
    skip_bits1(&s->gb);//marker bit
2867
    time_code_seconds = get_bits(&s->gb,6);
2868
    time_code_pictures = get_bits(&s->gb,6);
2869

    
2870
    /*broken_link indicate that after editing the
2871
      reference frames of the first B-Frames after GOP I-Frame
2872
      are missing (open gop)*/
2873
    broken_link = get_bits1(&s->gb);
2874

    
2875
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2876
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2877
            time_code_hours, time_code_minutes, time_code_seconds,
2878
            time_code_pictures, broken_link);
2879
}
2880
/**
2881
 * finds the end of the current frame in the bitstream.
2882
 * @return the position of the first byte of the next frame, or -1
2883
 */
2884
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2885
{
2886
    int i;
2887
    uint32_t state;
2888
    
2889
    state= pc->state;
2890
    
2891
    i=0;
2892
    if(!pc->frame_start_found){
2893
        for(i=0; i<buf_size; i++){
2894
            state= (state<<8) | buf[i];
2895
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2896
                i++;
2897
                pc->frame_start_found=1;
2898
                break;
2899
            }
2900
        }
2901
    }
2902
    
2903
    if(pc->frame_start_found){
2904
        /* EOF considered as end of frame */
2905
        if (buf_size == 0)
2906
            return 0;
2907
        for(; i<buf_size; i++){
2908
            state= (state<<8) | buf[i];
2909
            if((state&0xFFFFFF00) == 0x100){
2910
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2911
                    pc->frame_start_found=0;
2912
                    pc->state=-1; 
2913
                    return i-3;
2914
                }
2915
            }
2916
        }
2917
    }        
2918
    pc->state= state;
2919
    return END_NOT_FOUND;
2920
}
2921

    
2922
/* handle buffering and image synchronisation */
2923
static int mpeg_decode_frame(AVCodecContext *avctx, 
2924
                             void *data, int *data_size,
2925
                             uint8_t *buf, int buf_size)
2926
{
2927
    Mpeg1Context *s = avctx->priv_data;
2928
    const uint8_t *buf_end;
2929
    const uint8_t *buf_ptr;
2930
    int ret, start_code, input_size;
2931
    AVFrame *picture = data;
2932
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2933
    dprintf("fill_buffer\n");
2934

    
2935
    if (buf_size == 0) {
2936
        /* special case for last picture */
2937
        if (s2->low_delay==0 && s2->next_picture_ptr) {
2938
            *picture= *(AVFrame*)s2->next_picture_ptr;
2939
            s2->next_picture_ptr= NULL;
2940

    
2941
            *data_size = sizeof(AVFrame);
2942
        }
2943
        return 0;
2944
    }
2945

    
2946
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2947
        int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2948
        
2949
        if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
2950
            return buf_size;
2951
    }    
2952
    
2953
    buf_ptr = buf;
2954
    buf_end = buf + buf_size;
2955

    
2956
#if 0    
2957
    if (s->repeat_field % 2 == 1) { 
2958
        s->repeat_field++;
2959
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2960
        //        s2->picture_number, s->repeat_field);
2961
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2962
            *data_size = sizeof(AVPicture);
2963
            goto the_end;
2964
        }
2965
    }
2966
#endif
2967

    
2968
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2969
        vcr2_init_sequence(avctx);
2970
    
2971
    s->slice_count= 0;
2972
        
2973
    for(;;) {
2974
        /* find start next code */
2975
        start_code = find_start_code(&buf_ptr, buf_end);
2976
        if (start_code < 0){
2977
            if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2978
                if(avctx->thread_count > 1){
2979
                    int i;
2980

    
2981
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2982
                    for(i=0; i<s->slice_count; i++)
2983
                        s2->error_count += s2->thread_context[i]->error_count;
2984
                }
2985
                if (slice_end(avctx, picture)) {
2986
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2987
                        *data_size = sizeof(AVPicture);
2988
                }
2989
            }
2990
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2991
        }
2992
        
2993
        input_size = buf_end - buf_ptr;
2994

    
2995
        if(avctx->debug & FF_DEBUG_STARTCODE){
2996
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2997
        }
2998

    
2999
                /* prepare data for next start code */
3000
                switch(start_code) {
3001
                case SEQ_START_CODE:
3002
                    mpeg1_decode_sequence(avctx, buf_ptr, 
3003
                                          input_size);
3004
                    break;
3005
                            
3006
                case PICTURE_START_CODE:
3007
                    /* we have a complete image : we try to decompress it */
3008
                    mpeg1_decode_picture(avctx, 
3009
                                         buf_ptr, input_size);
3010
                    break;
3011
                case EXT_START_CODE:
3012
                    mpeg_decode_extension(avctx,
3013
                                          buf_ptr, input_size);
3014
                    break;
3015
                case USER_START_CODE:
3016
                    mpeg_decode_user_data(avctx, 
3017
                                          buf_ptr, input_size);
3018
                    break;
3019
                case GOP_START_CODE:
3020
                    s2->first_field=0;
3021
                    mpeg_decode_gop(avctx, 
3022
                                          buf_ptr, input_size);
3023
                    break;
3024
                default:
3025
                    if (start_code >= SLICE_MIN_START_CODE &&
3026
                        start_code <= SLICE_MAX_START_CODE) {
3027
                        int mb_y= start_code - SLICE_MIN_START_CODE;
3028
                        
3029
                        /* skip b frames if we dont have reference frames */
3030
                        if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
3031
                        /* skip b frames if we are in a hurry */
3032
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3033
                        /* skip everything if we are in a hurry>=5 */
3034
                        if(avctx->hurry_up>=5) break;
3035
                        
3036
                        if (!s->mpeg_enc_ctx_allocated) break;
3037

    
3038
                        if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3039
                            if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3040
                                break;
3041
                        }
3042
                        
3043
                        if(s2->first_slice){
3044
                            s2->first_slice=0;
3045
                            if(mpeg_field_start(s2) < 0)
3046
                                return -1;
3047
                        }
3048
                        
3049
                        if(avctx->thread_count > 1){
3050
                            int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3051
                            if(threshold <= mb_y){
3052
                                MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3053
                                
3054
                                thread_context->start_mb_y= mb_y;
3055
                                thread_context->end_mb_y  = s2->mb_height;
3056
                                if(s->slice_count){
3057
                                    s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3058
                                    ff_update_duplicate_context(thread_context, s2);
3059
                                }
3060
                                init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3061
                                s->slice_count++;
3062
                            }
3063
                            buf_ptr += 2; //FIXME add minimum num of bytes per slice
3064
                        }else{
3065
                            ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3066
                            emms_c();
3067

    
3068
                            if(ret < 0){
3069
                                if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3070
                                    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);
3071
                            }else{
3072
                                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);
3073
                            }
3074
                        }
3075
                    }
3076
                    break;
3077
                }
3078
    }
3079
}
3080

    
3081
static int mpeg_decode_end(AVCodecContext *avctx)
3082
{
3083
    Mpeg1Context *s = avctx->priv_data;
3084

    
3085
    if (s->mpeg_enc_ctx_allocated)
3086
        MPV_common_end(&s->mpeg_enc_ctx);
3087
    return 0;
3088
}
3089

    
3090
AVCodec mpeg1video_decoder = {
3091
    "mpeg1video",
3092
    CODEC_TYPE_VIDEO,
3093
    CODEC_ID_MPEG1VIDEO,
3094
    sizeof(Mpeg1Context),
3095
    mpeg_decode_init,
3096
    NULL,
3097
    mpeg_decode_end,
3098
    mpeg_decode_frame,
3099
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
3100
    .flush= ff_mpeg_flush,
3101
};
3102

    
3103
AVCodec mpeg2video_decoder = {
3104
    "mpeg2video",
3105
    CODEC_TYPE_VIDEO,
3106
    CODEC_ID_MPEG2VIDEO,
3107
    sizeof(Mpeg1Context),
3108
    mpeg_decode_init,
3109
    NULL,
3110
    mpeg_decode_end,
3111
    mpeg_decode_frame,
3112
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
3113
    .flush= ff_mpeg_flush,
3114
};
3115

    
3116
//legacy decoder
3117
AVCodec mpegvideo_decoder = {
3118
    "mpegvideo",
3119
    CODEC_TYPE_VIDEO,
3120
    CODEC_ID_MPEG2VIDEO,
3121
    sizeof(Mpeg1Context),
3122
    mpeg_decode_init,
3123
    NULL,
3124
    mpeg_decode_end,
3125
    mpeg_decode_frame,
3126
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
3127
    .flush= ff_mpeg_flush,
3128
};
3129

    
3130
#ifdef CONFIG_ENCODERS
3131

    
3132
AVCodec mpeg1video_encoder = {
3133
    "mpeg1video",
3134
    CODEC_TYPE_VIDEO,
3135
    CODEC_ID_MPEG1VIDEO,
3136
    sizeof(MpegEncContext),
3137
    encode_init,
3138
    MPV_encode_picture,
3139
    MPV_encode_end,
3140
    .supported_framerates= frame_rate_tab+1,
3141
    .capabilities= CODEC_CAP_DELAY,
3142
};
3143

    
3144
#ifdef CONFIG_RISKY
3145

    
3146
AVCodec mpeg2video_encoder = {
3147
    "mpeg2video",
3148
    CODEC_TYPE_VIDEO,
3149
    CODEC_ID_MPEG2VIDEO,
3150
    sizeof(MpegEncContext),
3151
    encode_init,
3152
    MPV_encode_picture,
3153
    MPV_encode_end,
3154
    .supported_framerates= frame_rate_tab+1,
3155
    .capabilities= CODEC_CAP_DELAY,
3156
};
3157
#endif
3158
#endif
3159

    
3160
#ifdef HAVE_XVMC
3161
static int mpeg_mc_decode_init(AVCodecContext *avctx){
3162
    Mpeg1Context *s;
3163

    
3164
    if( avctx->thread_count > 1) 
3165
        return -1;
3166
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3167
        return -1;
3168
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3169
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3170
    }
3171
    mpeg_decode_init(avctx);
3172
    s = avctx->priv_data;
3173

    
3174
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3175
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3176

    
3177
    return 0;
3178
}
3179

    
3180
AVCodec mpeg_xvmc_decoder = {
3181
    "mpegvideo_xvmc",
3182
    CODEC_TYPE_VIDEO,
3183
    CODEC_ID_MPEG2VIDEO_XVMC,
3184
    sizeof(Mpeg1Context),
3185
    mpeg_mc_decode_init,
3186
    NULL,
3187
    mpeg_decode_end,
3188
    mpeg_decode_frame,
3189
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
3190
    .flush= ff_mpeg_flush,
3191
};
3192

    
3193
#endif
3194

    
3195
/* this is ugly i know, but the alternative is too make 
3196
   hundreds of vars global and prefix them with ff_mpeg1_
3197
   which is far uglier. */
3198
#include "mdec.c"