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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 mpeg2_decode_block_non_intra(MpegEncContext *s, 
68
                                        DCTELEM *block, 
69
                                        int n);
70
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
71
                                    DCTELEM *block, 
72
                                    int n);
73
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
74
static void exchange_uv(MpegEncContext *s);
75

    
76
#ifdef HAVE_XVMC
77
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
78
extern int XVMC_field_end(MpegEncContext *s);
79
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
80
extern void XVMC_init_block(MpegEncContext *s);//set s->block
81
#endif
82

    
83
const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
84
const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
85
const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
86
const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
87
                                           PIX_FMT_XVMC_MPEG2_IDCT,
88
                                           PIX_FMT_XVMC_MPEG2_MC,
89
                                           -1};
90
#ifdef CONFIG_ENCODERS
91
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
92
static uint8_t fcode_tab[MAX_MV*2+1];
93

    
94
static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
95
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
96

    
97
/* simple include everything table for dc, first byte is bits number next 3 are code*/
98
static uint32_t mpeg1_lum_dc_uni[512];
99
static uint32_t mpeg1_chr_dc_uni[512];
100

    
101
static uint8_t mpeg1_index_run[2][64];
102
static int8_t mpeg1_max_level[2][64];
103
#endif //CONFIG_ENCODERS
104

    
105
static void init_2d_vlc_rl(RLTable *rl)
106
{
107
    int i;
108
    
109
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
110
             &rl->table_vlc[0][1], 4, 2,
111
             &rl->table_vlc[0][0], 4, 2);
112

    
113
    
114
    rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
115
    for(i=0; i<rl->vlc.table_size; i++){
116
        int code= rl->vlc.table[i][0];
117
        int len = rl->vlc.table[i][1];
118
        int level, run;
119
    
120
        if(len==0){ // illegal code
121
            run= 65;
122
            level= MAX_LEVEL;
123
        }else if(len<0){ //more bits needed
124
            run= 0;
125
            level= code;
126
        }else{
127
            if(code==rl->n){ //esc
128
                run= 65;
129
                level= 0;
130
            }else if(code==rl->n+1){ //eob
131
                run= 0;
132
                level= 127;
133
            }else{
134
                run=   rl->table_run  [code] + 1;
135
                level= rl->table_level[code];
136
            }
137
        }
138
        rl->rl_vlc[0][i].len= len;
139
        rl->rl_vlc[0][i].level= level;
140
        rl->rl_vlc[0][i].run= run;
141
    }
142
}
143

    
144
#ifdef CONFIG_ENCODERS
145
static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
146
    int i;
147

    
148
    for(i=0; i<128; i++){
149
        int level= i-64;
150
        int run;
151
        for(run=0; run<64; run++){
152
            int len, bits, code;
153
            
154
            int alevel= ABS(level);
155
            int sign= (level>>31)&1;
156

    
157
            if (alevel > rl->max_level[0][run])
158
                code= 111; /*rl->n*/
159
            else
160
                code= rl->index_run[0][run] + alevel - 1;
161

    
162
            if (code < 111 /* rl->n */) {
163
                    /* store the vlc & sign at once */
164
                len=   mpeg1_vlc[code][1]+1;
165
                bits= (mpeg1_vlc[code][0]<<1) + sign;
166
            } else {
167
                len=  mpeg1_vlc[111/*rl->n*/][1]+6;
168
                bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
169

    
170
                bits|= run;
171
                if (alevel < 128) {
172
                    bits<<=8; len+=8;
173
                    bits|= level & 0xff;
174
                } else {
175
                    bits<<=16; len+=16;
176
                    bits|= level & 0xff;
177
                    if (level < 0) {
178
                        bits|= 0x8001 + level + 255;
179
                    } else {
180
                        bits|= level & 0xffff;
181
                    }
182
                }
183
            }
184

    
185
            uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
186
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
187
        }
188
    }
189
}
190

    
191

    
192
static int find_frame_rate_index(MpegEncContext *s){
193
    int i;
194
    int64_t dmin= INT64_MAX;
195
    int64_t d;
196

    
197
    for(i=1;i<14;i++) {
198
        int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->frame_rate_base;
199
        int64_t n1= 1001LL*s->avctx->frame_rate;
200
        if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
201

    
202
        d = ABS(n0 - n1);
203
        if(d < dmin){
204
            dmin=d;
205
            s->frame_rate_index= i;
206
        }
207
    }
208
    if(dmin)
209
        return -1;
210
    else
211
        return 0;
212
}
213

    
214
static int encode_init(AVCodecContext *avctx)
215
{
216
    MpegEncContext *s = avctx->priv_data;
217

    
218
    if(MPV_encode_init(avctx) < 0)
219
        return -1;
220

    
221
    if(find_frame_rate_index(s) < 0){
222
        if(s->strict_std_compliance >=0){
223
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 doesnt support %d/%d fps\n", avctx->frame_rate, avctx->frame_rate_base);
224
            return -1;
225
        }else{
226
            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);
227
        }
228
    }
229
    
230
    return 0;
231
}
232

    
233
static void put_header(MpegEncContext *s, int header)
234
{
235
    align_put_bits(&s->pb);
236
    put_bits(&s->pb, 16, header>>16);
237
    put_bits(&s->pb, 16, header&0xFFFF);
238
}
239

    
240
/* put sequence header if needed */
241
static void mpeg1_encode_sequence_header(MpegEncContext *s)
242
{
243
        unsigned int vbv_buffer_size;
244
        unsigned int fps, v;
245
        int i;
246
        uint64_t time_code;
247
        float best_aspect_error= 1E10;
248
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
249
        int constraint_parameter_flag;
250
        
251
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
252
        
253
        if (s->current_picture.key_frame) {
254
            AVRational framerate= frame_rate_tab[s->frame_rate_index];
255

    
256
            /* mpeg1 header repeated every gop */
257
            put_header(s, SEQ_START_CODE);
258
 
259
            put_bits(&s->pb, 12, s->width);
260
            put_bits(&s->pb, 12, s->height);
261
            
262
            for(i=1; i<15; i++){
263
                float error= aspect_ratio;
264
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
265
                    error-= 1.0/mpeg1_aspect[i];
266
                else
267
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
268
             
269
                error= ABS(error);
270
                
271
                if(error < best_aspect_error){
272
                    best_aspect_error= error;
273
                    s->aspect_ratio_info= i;
274
                }
275
            }
276
            
277
            put_bits(&s->pb, 4, s->aspect_ratio_info);
278
            put_bits(&s->pb, 4, s->frame_rate_index);
279
            
280
            if(s->avctx->rc_max_rate){
281
                v = (s->avctx->rc_max_rate + 399) / 400;
282
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
283
                    v = 0x3ffff;
284
            }else{
285
                v= 0x3FFFF;
286
            }
287

    
288
            if(s->avctx->rc_buffer_size)
289
                vbv_buffer_size = s->avctx->rc_buffer_size;
290
            else
291
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
292
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
293
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
294

    
295
            put_bits(&s->pb, 18, v & 0x3FFFF);
296
            put_bits(&s->pb, 1, 1); /* marker */
297
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
298

    
299
            constraint_parameter_flag= 
300
                s->width <= 768 && s->height <= 576 && 
301
                s->mb_width * s->mb_height <= 396 &&
302
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
303
                framerate.num <= framerate.den*30 &&
304
                vbv_buffer_size <= 20 &&
305
                v <= 1856000/400 &&
306
                s->codec_id == CODEC_ID_MPEG1VIDEO;
307
                
308
            put_bits(&s->pb, 1, constraint_parameter_flag);
309
            
310
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
311
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
312

    
313
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
314
                put_header(s, EXT_START_CODE);
315
                put_bits(&s->pb, 4, 1); //seq ext
316
                put_bits(&s->pb, 1, 0); //esc
317
                put_bits(&s->pb, 3, 4); //profile
318
                put_bits(&s->pb, 4, 8); //level
319
                put_bits(&s->pb, 1, s->progressive_sequence);
320
                put_bits(&s->pb, 2, 1); //chroma format 4:2:0
321
                put_bits(&s->pb, 2, 0); //horizontal size ext
322
                put_bits(&s->pb, 2, 0); //vertical size ext
323
                put_bits(&s->pb, 12, v>>18); //bitrate ext
324
                put_bits(&s->pb, 1, 1); //marker
325
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
326
                put_bits(&s->pb, 1, s->low_delay);
327
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
328
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
329
            }
330
            
331
            put_header(s, GOP_START_CODE);
332
            put_bits(&s->pb, 1, 0); /* do drop frame */
333
            /* time code : we must convert from the real frame rate to a
334
               fake mpeg frame rate in case of low frame rate */
335
            fps = (framerate.num + framerate.den/2)/ framerate.den;
336
            time_code = s->current_picture_ptr->coded_picture_number;
337

    
338
            s->gop_picture_number = time_code;
339
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
340
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
341
            put_bits(&s->pb, 1, 1);
342
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
343
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
344
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
345
            put_bits(&s->pb, 1, 0); /* broken link */
346
        }
347
}
348

    
349
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
350
    while (run >= 33) {
351
        put_bits(&s->pb, 11, 0x008);
352
        run -= 33;
353
    }
354
    put_bits(&s->pb, mbAddrIncrTable[run][1], 
355
             mbAddrIncrTable[run][0]);
356
}
357
#endif //CONFIG_ENCODERS
358

    
359
static void common_init(MpegEncContext *s)
360
{
361
int i;
362

    
363
    s->y_dc_scale_table=
364
    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
365

    
366
    if(!s->encoding)    
367
    for(i=0;i<64;i++)
368
       s->dsp.idct_permutation[i]=i;
369
}
370

    
371
void ff_mpeg1_clean_buffers(MpegEncContext *s){
372
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
373
    s->last_dc[1] = s->last_dc[0];
374
    s->last_dc[2] = s->last_dc[0];
375
    memset(s->last_mv, 0, sizeof(s->last_mv));
376
}
377

    
378
#ifdef CONFIG_ENCODERS
379

    
380
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
381
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
382
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
383
    put_bits(&s->pb, 1, 0); /* slice extra information */
384
}
385

    
386
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
387
{
388
    mpeg1_encode_sequence_header(s);
389

    
390
    /* mpeg1 picture header */
391
    put_header(s, PICTURE_START_CODE);
392
    /* temporal reference */
393

    
394
    // RAL: s->picture_number instead of s->fake_picture_number
395
    put_bits(&s->pb, 10, (s->picture_number - 
396
                          s->gop_picture_number) & 0x3ff); 
397
    put_bits(&s->pb, 3, s->pict_type);
398

    
399
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
400
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
401
    
402
    // RAL: Forward f_code also needed for B frames
403
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
404
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
405
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
406
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
407
        else
408
            put_bits(&s->pb, 3, 7); /* forward_f_code */
409
    }
410
    
411
    // RAL: Backward f_code necessary for B frames
412
    if (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->b_code); /* backward_f_code */
416
        else
417
            put_bits(&s->pb, 3, 7); /* backward_f_code */
418
    }
419

    
420
    put_bits(&s->pb, 1, 0); /* extra bit picture */
421

    
422
    s->frame_pred_frame_dct = 1;
423
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
424
        put_header(s, EXT_START_CODE);
425
        put_bits(&s->pb, 4, 8); //pic ext
426
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
427
            put_bits(&s->pb, 4, s->f_code);
428
            put_bits(&s->pb, 4, s->f_code);
429
        }else{
430
            put_bits(&s->pb, 8, 255);
431
        }
432
        if (s->pict_type == B_TYPE) {
433
            put_bits(&s->pb, 4, s->b_code);
434
            put_bits(&s->pb, 4, s->b_code);
435
        }else{
436
            put_bits(&s->pb, 8, 255);
437
        }
438
        put_bits(&s->pb, 2, s->intra_dc_precision);
439
        
440
        assert(s->picture_structure == PICT_FRAME);
441
        put_bits(&s->pb, 2, s->picture_structure);
442
        if (s->progressive_sequence) {
443
            put_bits(&s->pb, 1, 0); /* no repeat */
444
        } else {
445
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
446
        }
447
        /* XXX: optimize the generation of this flag with entropy
448
           measures */
449
        s->frame_pred_frame_dct = s->progressive_sequence;
450
        
451
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
452
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
453
        put_bits(&s->pb, 1, s->q_scale_type);
454
        put_bits(&s->pb, 1, s->intra_vlc_format);
455
        put_bits(&s->pb, 1, s->alternate_scan);
456
        put_bits(&s->pb, 1, s->repeat_first_field);
457
        put_bits(&s->pb, 1, s->chroma_420_type=1);
458
        s->progressive_frame = s->progressive_sequence;
459
        put_bits(&s->pb, 1, s->progressive_frame);
460
        put_bits(&s->pb, 1, 0); //composite_display_flag
461
    }
462
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
463
        int i;
464

    
465
        put_header(s, USER_START_CODE);
466
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
467
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
468
        }
469
    }
470
    
471
    s->mb_y=0;
472
    ff_mpeg1_encode_slice_header(s);
473
}
474

    
475
static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
476
                                int has_mv, int field_motion)
477
{
478
    put_bits(&s->pb, n, bits);
479
    if (!s->frame_pred_frame_dct) {
480
        if (has_mv) 
481
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
482
        put_bits(&s->pb, 1, s->interlaced_dct);
483
    }
484
}
485

    
486
void mpeg1_encode_mb(MpegEncContext *s,
487
                     DCTELEM block[6][64],
488
                     int motion_x, int motion_y)
489
{
490
    int i, cbp;
491
    const int mb_x = s->mb_x;
492
    const int mb_y = s->mb_y;
493
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
494

    
495
    /* compute cbp */
496
    cbp = 0;
497
    for(i=0;i<6;i++) {
498
        if (s->block_last_index[i] >= 0)
499
            cbp |= 1 << (5 - i);
500
    }
501
    
502
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
503
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
504
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
505
        (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) |
506
        ((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))) {
507
        s->mb_skip_run++;
508
        s->qscale -= s->dquant;
509
        s->skip_count++;
510
        s->misc_bits++;
511
        s->last_bits++;
512
        if(s->pict_type == P_TYPE){
513
            s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
514
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
515
        }
516
    } else {
517
        if(first_mb){
518
            assert(s->mb_skip_run == 0);
519
            encode_mb_skip_run(s, s->mb_x);
520
        }else{
521
            encode_mb_skip_run(s, s->mb_skip_run);
522
        }
523
        
524
        if (s->pict_type == I_TYPE) {
525
            if(s->dquant && cbp){
526
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
527
                put_bits(&s->pb, 5, s->qscale);
528
            }else{
529
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
530
                s->qscale -= s->dquant;
531
            }
532
            s->misc_bits+= get_bits_diff(s);
533
            s->i_count++;
534
        } else if (s->mb_intra) {
535
            if(s->dquant && cbp){
536
                put_mb_modes(s, 6, 0x01, 0, 0);
537
                put_bits(&s->pb, 5, s->qscale);
538
            }else{
539
                put_mb_modes(s, 5, 0x03, 0, 0);
540
                s->qscale -= s->dquant;
541
            }
542
            s->misc_bits+= get_bits_diff(s);
543
            s->i_count++;
544
            memset(s->last_mv, 0, sizeof(s->last_mv));
545
        } else if (s->pict_type == P_TYPE) { 
546
            if(s->mv_type == MV_TYPE_16X16){
547
                if (cbp != 0) {
548
                    if ((motion_x|motion_y) == 0) {
549
                        if(s->dquant){
550
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
551
                            put_bits(&s->pb, 5, s->qscale);
552
                        }else{
553
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
554
                        }
555
                        s->misc_bits+= get_bits_diff(s);
556
                    } else {
557
                        if(s->dquant){
558
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
559
                            put_bits(&s->pb, 5, s->qscale);
560
                        }else{
561
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
562
                        }
563
                        s->misc_bits+= get_bits_diff(s);
564
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
565
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
566
                        s->mv_bits+= get_bits_diff(s);
567
                    }
568
                } else {
569
                    put_bits(&s->pb, 3, 1); /* motion only */
570
                    if (!s->frame_pred_frame_dct)
571
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
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->qscale -= s->dquant;
576
                    s->mv_bits+= get_bits_diff(s);
577
                }
578
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
579
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
580
            }else{
581
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
582

    
583
                if (cbp) {
584
                    if(s->dquant){
585
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
586
                        put_bits(&s->pb, 5, s->qscale);
587
                    }else{
588
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
589
                    }
590
                } else {
591
                    put_bits(&s->pb, 3, 1); /* motion only */
592
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
593
                    s->qscale -= s->dquant;
594
                }
595
                s->misc_bits+= get_bits_diff(s);
596
                for(i=0; i<2; i++){
597
                    put_bits(&s->pb, 1, s->field_select[0][i]);
598
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
599
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
600
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
601
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
602
                }
603
                s->mv_bits+= get_bits_diff(s);
604
            }
605
            if(cbp)
606
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
607
            s->f_count++;
608
        } else{  
609
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
610

    
611
            if(s->mv_type == MV_TYPE_16X16){
612
                if (cbp){    // With coded bloc pattern
613
                    if (s->dquant) {
614
                        if(s->mv_dir == MV_DIR_FORWARD)
615
                            put_mb_modes(s, 6, 3, 1, 0);
616
                        else
617
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
618
                        put_bits(&s->pb, 5, s->qscale);
619
                    } else {
620
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
621
                    }
622
                }else{    // No coded bloc pattern
623
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
624
                    if (!s->frame_pred_frame_dct)
625
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
626
                    s->qscale -= s->dquant;
627
                }
628
                s->misc_bits += get_bits_diff(s);
629
                if (s->mv_dir&MV_DIR_FORWARD){
630
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
631
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
632
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
633
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
634
                    s->f_count++;
635
                }
636
                if (s->mv_dir&MV_DIR_BACKWARD){
637
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
638
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
639
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
640
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
641
                    s->b_count++;
642
                }
643
            }else{
644
                assert(s->mv_type == MV_TYPE_FIELD);
645
                assert(!s->frame_pred_frame_dct);
646
                if (cbp){    // With coded bloc pattern
647
                    if (s->dquant) {
648
                        if(s->mv_dir == MV_DIR_FORWARD)
649
                            put_mb_modes(s, 6, 3, 1, 1);
650
                        else
651
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
652
                        put_bits(&s->pb, 5, s->qscale);
653
                    } else {
654
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
655
                    }
656
                }else{    // No coded bloc pattern
657
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
658
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
659
                    s->qscale -= s->dquant;
660
                }
661
                s->misc_bits += get_bits_diff(s);
662
                if (s->mv_dir&MV_DIR_FORWARD){
663
                    for(i=0; i<2; i++){
664
                        put_bits(&s->pb, 1, s->field_select[0][i]);
665
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
666
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
667
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
668
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
669
                    }
670
                    s->f_count++;
671
                }
672
                if (s->mv_dir&MV_DIR_BACKWARD){
673
                    for(i=0; i<2; i++){
674
                        put_bits(&s->pb, 1, s->field_select[1][i]);
675
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
676
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
677
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
678
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
679
                    }
680
                    s->b_count++;
681
                }
682
            }
683
            s->mv_bits += get_bits_diff(s);
684
            if(cbp)
685
                put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
686
        }
687
        for(i=0;i<6;i++) {
688
            if (cbp & (1 << (5 - i))) {
689
                mpeg1_encode_block(s, block[i], i);
690
            }
691
        }
692
        s->mb_skip_run = 0;
693
        if(s->mb_intra)
694
            s->i_tex_bits+= get_bits_diff(s);
695
        else
696
            s->p_tex_bits+= get_bits_diff(s);
697
    }
698
}
699

    
700
// RAL: Parameter added: f_or_b_code
701
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
702
{
703
    int code, bit_size, l, m, bits, range, sign;
704

    
705
    if (val == 0) {
706
        /* zero vector */
707
        code = 0;
708
        put_bits(&s->pb,
709
                 mbMotionVectorTable[0][1], 
710
                 mbMotionVectorTable[0][0]); 
711
    } else {
712
        bit_size = f_or_b_code - 1;
713
        range = 1 << bit_size;
714
        /* modulo encoding */
715
        l = 16 * range;
716
        m = 2 * l;
717
        if (val < -l) {
718
            val += m;
719
        } else if (val >= l) {
720
            val -= m;
721
        }
722

    
723
        if (val >= 0) {
724
            val--;
725
            code = (val >> bit_size) + 1;
726
            bits = val & (range - 1);
727
            sign = 0;
728
        } else {
729
            val = -val;
730
            val--;
731
            code = (val >> bit_size) + 1;
732
            bits = val & (range - 1);
733
            sign = 1;
734
        }
735

    
736
        assert(code > 0 && code <= 16);
737

    
738
        put_bits(&s->pb,
739
                 mbMotionVectorTable[code][1], 
740
                 mbMotionVectorTable[code][0]); 
741

    
742
        put_bits(&s->pb, 1, sign);
743
        if (bit_size > 0) {
744
            put_bits(&s->pb, bit_size, bits);
745
        }
746
    }
747
}
748

    
749
void ff_mpeg1_encode_init(MpegEncContext *s)
750
{
751
    static int done=0;
752

    
753
    common_init(s);
754

    
755
    if(!done){
756
        int f_code;
757
        int mv;
758
        int i;
759

    
760
        done=1;
761
        init_rl(&rl_mpeg1);
762

    
763
        for(i=0; i<64; i++)
764
        {
765
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
766
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
767
        }
768
        
769
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
770

    
771
        /* build unified dc encoding tables */
772
        for(i=-255; i<256; i++)
773
        {
774
                int adiff, index;
775
                int bits, code;
776
                int diff=i;
777

    
778
                adiff = ABS(diff);
779
                if(diff<0) diff--;
780
                index = vlc_dc_table[adiff];
781

    
782
                bits= vlc_dc_lum_bits[index] + index;
783
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
784
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
785
                
786
                bits= vlc_dc_chroma_bits[index] + index;
787
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
788
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
789
        }
790

    
791
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
792

    
793
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
794
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
795
                int len;
796

    
797
                if(mv==0) len= mbMotionVectorTable[0][1];
798
                else{
799
                    int val, bit_size, range, code;
800

    
801
                    bit_size = f_code - 1;
802
                    range = 1 << bit_size;
803

    
804
                    val=mv;
805
                    if (val < 0) 
806
                        val = -val;
807
                    val--;
808
                    code = (val >> bit_size) + 1;
809
                    if(code<17){
810
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
811
                    }else{
812
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
813
                    }
814
                }
815

    
816
                mv_penalty[f_code][mv+MAX_MV]= len;
817
            }
818
        }
819
        
820

    
821
        for(f_code=MAX_FCODE; f_code>0; f_code--){
822
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
823
                fcode_tab[mv+MAX_MV]= f_code;
824
            }
825
        }
826
    }
827
    s->me.mv_penalty= mv_penalty;
828
    s->fcode_tab= fcode_tab;
829
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
830
        s->min_qcoeff=-255;
831
        s->max_qcoeff= 255;
832
    }else{
833
        s->min_qcoeff=-2047;
834
        s->max_qcoeff= 2047;
835
    }
836
    s->intra_ac_vlc_length=
837
    s->inter_ac_vlc_length=
838
    s->intra_ac_vlc_last_length=
839
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
840
}
841

    
842
static inline void encode_dc(MpegEncContext *s, int diff, int component)
843
{
844
    if (component == 0) {
845
        put_bits(
846
            &s->pb, 
847
            mpeg1_lum_dc_uni[diff+255]&0xFF,
848
            mpeg1_lum_dc_uni[diff+255]>>8);
849
    } else {
850
        put_bits(
851
            &s->pb, 
852
            mpeg1_chr_dc_uni[diff+255]&0xFF,
853
            mpeg1_chr_dc_uni[diff+255]>>8);
854
    }
855
}
856

    
857
static void mpeg1_encode_block(MpegEncContext *s, 
858
                               DCTELEM *block, 
859
                               int n)
860
{
861
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
862
    int code, component;
863
//    RLTable *rl = &rl_mpeg1;
864

    
865
    last_index = s->block_last_index[n];
866

    
867
    /* DC coef */
868
    if (s->mb_intra) {
869
        component = (n <= 3 ? 0 : n - 4 + 1);
870
        dc = block[0]; /* overflow is impossible */
871
        diff = dc - s->last_dc[component];
872
        encode_dc(s, diff, component);
873
        s->last_dc[component] = dc;
874
        i = 1;
875
/*
876
        if (s->intra_vlc_format)
877
            rl = &rl_mpeg2;
878
        else
879
            rl = &rl_mpeg1;
880
*/
881
    } else {
882
        /* encode the first coefficient : needs to be done here because
883
           it is handled slightly differently */
884
        level = block[0];
885
        if (abs(level) == 1) {
886
                code = ((uint32_t)level >> 31); /* the sign bit */
887
                put_bits(&s->pb, 2, code | 0x02);
888
                i = 1;
889
        } else {
890
            i = 0;
891
            last_non_zero = -1;
892
            goto next_coef;
893
        }
894
    }
895

    
896
    /* now quantify & encode AC coefs */
897
    last_non_zero = i - 1;
898

    
899
    for(;i<=last_index;i++) {
900
        j = s->intra_scantable.permutated[i];
901
        level = block[j];
902
    next_coef:
903
#if 0
904
        if (level != 0)
905
            dprintf("level[%d]=%d\n", i, level);
906
#endif            
907
        /* encode using VLC */
908
        if (level != 0) {
909
            run = i - last_non_zero - 1;
910
            
911
            alevel= level;
912
            MASK_ABS(sign, alevel)
913
            sign&=1;
914

    
915
//            code = get_rl_index(rl, 0, run, alevel);
916
            if (alevel <= mpeg1_max_level[0][run]){
917
                code= mpeg1_index_run[0][run] + alevel - 1;
918
                    /* store the vlc & sign at once */
919
                put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
920
            } else {
921
                /* escape seems to be pretty rare <5% so i dont optimize it */
922
                put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
923
                /* escape: only clip in this case */
924
                put_bits(&s->pb, 6, run);
925
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
926
                    if (alevel < 128) {
927
                        put_bits(&s->pb, 8, level & 0xff);
928
                    } else {
929
                        if (level < 0) {
930
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
931
                        } else {
932
                            put_bits(&s->pb, 16, level & 0xffff);
933
                        }
934
                    }
935
                }else{
936
                    put_bits(&s->pb, 12, level & 0xfff);
937
                }
938
            }
939
            last_non_zero = i;
940
        }
941
    }
942
    /* end of block */
943
    put_bits(&s->pb, 2, 0x2);
944
}
945
#endif //CONFIG_ENCODERS
946

    
947
/******************************************/
948
/* decoding */
949

    
950
static VLC dc_lum_vlc;
951
static VLC dc_chroma_vlc;
952
static VLC mv_vlc;
953
static VLC mbincr_vlc;
954
static VLC mb_ptype_vlc;
955
static VLC mb_btype_vlc;
956
static VLC mb_pat_vlc;
957

    
958
static void init_vlcs(void)
959
{
960
    static int done = 0;
961

    
962
    if (!done) {
963
        done = 1;
964

    
965
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
966
                 vlc_dc_lum_bits, 1, 1,
967
                 vlc_dc_lum_code, 2, 2);
968
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
969
                 vlc_dc_chroma_bits, 1, 1,
970
                 vlc_dc_chroma_code, 2, 2);
971
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
972
                 &mbMotionVectorTable[0][1], 2, 1,
973
                 &mbMotionVectorTable[0][0], 2, 1);
974
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
975
                 &mbAddrIncrTable[0][1], 2, 1,
976
                 &mbAddrIncrTable[0][0], 2, 1);
977
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
978
                 &mbPatTable[0][1], 2, 1,
979
                 &mbPatTable[0][0], 2, 1);
980
        
981
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
982
                 &table_mb_ptype[0][1], 2, 1,
983
                 &table_mb_ptype[0][0], 2, 1);
984
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
985
                 &table_mb_btype[0][1], 2, 1,
986
                 &table_mb_btype[0][0], 2, 1);
987
        init_rl(&rl_mpeg1);
988
        init_rl(&rl_mpeg2);
989

    
990
        init_2d_vlc_rl(&rl_mpeg1);
991
        init_2d_vlc_rl(&rl_mpeg2);
992
    }
993
}
994

    
995
static inline int get_dmv(MpegEncContext *s)
996
{
997
    if(get_bits1(&s->gb)) 
998
        return 1 - (get_bits1(&s->gb) << 1);
999
    else
1000
        return 0;
1001
}
1002

    
1003
static inline int get_qscale(MpegEncContext *s)
1004
{
1005
    int qscale = get_bits(&s->gb, 5);
1006
    if (s->q_scale_type) {
1007
        return non_linear_qscale[qscale];
1008
    } else {
1009
        return qscale << 1;
1010
    }
1011
}
1012

    
1013
/* motion type (for mpeg2) */
1014
#define MT_FIELD 1
1015
#define MT_FRAME 2
1016
#define MT_16X8  2
1017
#define MT_DMV   3
1018

    
1019
static int mpeg_decode_mb(MpegEncContext *s,
1020
                          DCTELEM block[12][64])
1021
{
1022
    int i, j, k, cbp, val, mb_type, motion_type;
1023
    
1024
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1025

    
1026
    assert(s->mb_skiped==0);
1027

    
1028
    if (s->mb_skip_run-- != 0) {
1029
        if(s->pict_type == I_TYPE){
1030
            av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1031
            return -1;
1032
        }
1033
    
1034
        /* skip mb */
1035
        s->mb_intra = 0;
1036
        for(i=0;i<12;i++)
1037
            s->block_last_index[i] = -1;
1038
        if(s->picture_structure == PICT_FRAME)
1039
            s->mv_type = MV_TYPE_16X16;
1040
        else
1041
            s->mv_type = MV_TYPE_FIELD;
1042
        if (s->pict_type == P_TYPE) {
1043
            /* if P type, zero motion vector is implied */
1044
            s->mv_dir = MV_DIR_FORWARD;
1045
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1046
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1047
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1048
            s->field_select[0][0]= s->picture_structure - 1;
1049
            s->mb_skiped = 1;
1050
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1051
        } else {
1052
            /* if B type, reuse previous vectors and directions */
1053
            s->mv[0][0][0] = s->last_mv[0][0][0];
1054
            s->mv[0][0][1] = s->last_mv[0][0][1];
1055
            s->mv[1][0][0] = s->last_mv[1][0][0];
1056
            s->mv[1][0][1] = s->last_mv[1][0][1];
1057

    
1058
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1059
                s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1060
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1061

    
1062
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1063
                s->mb_skiped = 1;
1064
        }
1065

    
1066
        return 0;
1067
    }
1068

    
1069
    switch(s->pict_type) {
1070
    default:
1071
    case I_TYPE:
1072
        if (get_bits1(&s->gb) == 0) {
1073
            if (get_bits1(&s->gb) == 0){
1074
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1075
                return -1;
1076
            }
1077
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1078
        } else {
1079
            mb_type = MB_TYPE_INTRA;
1080
        }
1081
        break;
1082
    case P_TYPE:
1083
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1084
        if (mb_type < 0){
1085
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1086
            return -1;
1087
        }
1088
        mb_type = ptype2mb_type[ mb_type ];
1089
        break;
1090
    case B_TYPE:
1091
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1092
        if (mb_type < 0){
1093
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1094
            return -1;
1095
        }
1096
        mb_type = btype2mb_type[ mb_type ];
1097
        break;
1098
    }
1099
    dprintf("mb_type=%x\n", mb_type);
1100
//    motion_type = 0; /* avoid warning */
1101
    if (IS_INTRA(mb_type)) {
1102
        /* compute dct type */
1103
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1104
            !s->frame_pred_frame_dct) {
1105
            s->interlaced_dct = get_bits1(&s->gb);
1106
        }
1107

    
1108
        if (IS_QUANT(mb_type))
1109
            s->qscale = get_qscale(s);
1110
        
1111
        if (s->concealment_motion_vectors) {
1112
            /* just parse them */
1113
            if (s->picture_structure != PICT_FRAME) 
1114
                skip_bits1(&s->gb); /* field select */
1115
            
1116
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1117
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1118
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1119
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1120

    
1121
            skip_bits1(&s->gb); /* marker */
1122
        }else
1123
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1124
        s->mb_intra = 1;
1125
#ifdef HAVE_XVMC
1126
        //one 1 we memcpy blocks in xvmcvideo
1127
        if(s->avctx->xvmc_acceleration > 1){
1128
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1129
            if(s->swap_uv){
1130
                exchange_uv(s);
1131
            }
1132
        }
1133
#endif
1134

    
1135
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1136
            for(i=0;i<4+(1<<s->chroma_format);i++) {
1137
                if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1138
                    return -1;
1139
            }
1140
        } else {
1141
            for(i=0;i<6;i++) {
1142
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1143
                    return -1;
1144
            }
1145
        }
1146
    } else {
1147
        if (mb_type & MB_TYPE_ZERO_MV){
1148
            assert(mb_type & MB_TYPE_CBP);
1149

    
1150
            /* compute dct type */
1151
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1152
                !s->frame_pred_frame_dct) {
1153
                s->interlaced_dct = get_bits1(&s->gb);
1154
            }
1155

    
1156
            if (IS_QUANT(mb_type))
1157
                s->qscale = get_qscale(s);
1158

    
1159
            s->mv_dir = MV_DIR_FORWARD;
1160
            if(s->picture_structure == PICT_FRAME)
1161
                s->mv_type = MV_TYPE_16X16;
1162
            else{
1163
                s->mv_type = MV_TYPE_FIELD;
1164
                mb_type |= MB_TYPE_INTERLACED;
1165
                s->field_select[0][0]= s->picture_structure - 1;
1166
            }
1167
            s->last_mv[0][0][0] = 0;
1168
            s->last_mv[0][0][1] = 0;
1169
            s->last_mv[0][1][0] = 0;
1170
            s->last_mv[0][1][1] = 0;
1171
            s->mv[0][0][0] = 0;
1172
            s->mv[0][0][1] = 0;
1173
        }else{
1174
            assert(mb_type & MB_TYPE_L0L1);
1175
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1176
            /* get additionnal motion vector type */
1177
            if (s->frame_pred_frame_dct) 
1178
                motion_type = MT_FRAME;
1179
            else{
1180
                motion_type = get_bits(&s->gb, 2);
1181
            }
1182

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

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

    
1192
            /* motion vectors */
1193
            s->mv_dir = 0;
1194
            for(i=0;i<2;i++) {
1195
                if (USES_LIST(mb_type, i)) {
1196
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1197
                    dprintf("motion_type=%d\n", motion_type);
1198
                    switch(motion_type) {
1199
                    case MT_FRAME: /* or MT_16X8 */
1200
                        if (s->picture_structure == PICT_FRAME) {
1201
                            /* MT_FRAME */
1202
                            mb_type |= MB_TYPE_16x16; 
1203
                            s->mv_type = MV_TYPE_16X16;
1204
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1205
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1206
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1207
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1208
                            /* full_pel: only for mpeg1 */
1209
                            if (s->full_pel[i]){
1210
                                s->mv[i][0][0] <<= 1;
1211
                                s->mv[i][0][1] <<= 1;
1212
                            }
1213
                        } else {
1214
                            /* MT_16X8 */
1215
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1216
                            s->mv_type = MV_TYPE_16X8;
1217
                            for(j=0;j<2;j++) {
1218
                                s->field_select[i][j] = get_bits1(&s->gb);
1219
                                for(k=0;k<2;k++) {
1220
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1221
                                                             s->last_mv[i][j][k]);
1222
                                    s->last_mv[i][j][k] = val;
1223
                                    s->mv[i][j][k] = val;
1224
                                }
1225
                            }
1226
                        }
1227
                        break;
1228
                    case MT_FIELD:
1229
                        s->mv_type = MV_TYPE_FIELD;
1230
                        if (s->picture_structure == PICT_FRAME) {
1231
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1232
                            for(j=0;j<2;j++) {
1233
                                s->field_select[i][j] = get_bits1(&s->gb);
1234
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1235
                                                         s->last_mv[i][j][0]);
1236
                                s->last_mv[i][j][0] = val;
1237
                                s->mv[i][j][0] = val;
1238
                                dprintf("fmx=%d\n", val);
1239
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1240
                                                         s->last_mv[i][j][1] >> 1);
1241
                                s->last_mv[i][j][1] = val << 1;
1242
                                s->mv[i][j][1] = val;
1243
                                dprintf("fmy=%d\n", val);
1244
                            }
1245
                        } else {
1246
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1247
                            s->field_select[i][0] = get_bits1(&s->gb);
1248
                            for(k=0;k<2;k++) {
1249
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1250
                                                         s->last_mv[i][0][k]);
1251
                                s->last_mv[i][0][k] = val;
1252
                                s->last_mv[i][1][k] = val;
1253
                                s->mv[i][0][k] = val;
1254
                            }
1255
                        }
1256
                        break;
1257
                    case MT_DMV:
1258
                        {
1259
                            int dmx, dmy, mx, my, m;
1260

    
1261
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1262
                                                    s->last_mv[i][0][0]);
1263
                            s->last_mv[i][0][0] = mx;
1264
                            s->last_mv[i][1][0] = mx;
1265
                            dmx = get_dmv(s);
1266
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1267
                                                    s->last_mv[i][0][1] >> 1);
1268
                            dmy = get_dmv(s);
1269
                            s->mv_type = MV_TYPE_DMV;
1270

    
1271

    
1272
                            s->last_mv[i][0][1] = my<<1;
1273
                            s->last_mv[i][1][1] = my<<1;
1274

    
1275
                            s->mv[i][0][0] = mx;
1276
                            s->mv[i][0][1] = my;
1277
                            s->mv[i][1][0] = mx;//not used
1278
                            s->mv[i][1][1] = my;//not used
1279

    
1280
                            if (s->picture_structure == PICT_FRAME) {
1281
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1282

    
1283
                                //m = 1 + 2 * s->top_field_first;
1284
                                m = s->top_field_first ? 1 : 3;
1285

    
1286
                                /* top -> top pred */
1287
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1288
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1289
                                m = 4 - m;
1290
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1291
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1292
                            } else {
1293
                                mb_type |= MB_TYPE_16x16;
1294

    
1295
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1296
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1297
                                if(s->picture_structure == PICT_TOP_FIELD)
1298
                                    s->mv[i][2][1]--;
1299
                                else 
1300
                                    s->mv[i][2][1]++;
1301
                            }
1302
                        }
1303
                        break;
1304
                    default:
1305
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1306
                        return -1;
1307
                    }
1308
                }
1309
            }
1310
        }
1311
        
1312
        s->mb_intra = 0;
1313

    
1314
        if (HAS_CBP(mb_type)) {
1315
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1316
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1317
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1318
                return -1;
1319
            }
1320
            if(s->chroma_format == 2){//CHROMA422
1321
                 cbp|= ( get_bits(&s->gb,2) ) << 6;
1322
            }else
1323
            if(s->chroma_format >  2){//CHROMA444
1324
                 cbp|= ( get_bits(&s->gb,6) ) << 6;
1325
            }
1326

    
1327
#ifdef HAVE_XVMC
1328
            //on 1 we memcpy blocks in xvmcvideo
1329
            if(s->avctx->xvmc_acceleration > 1){
1330
                XVMC_pack_pblocks(s,cbp);
1331
                if(s->swap_uv){
1332
                    exchange_uv(s);
1333
                }
1334
            }    
1335
#endif
1336

    
1337
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1338
                for(i=0;i<6;i++) {
1339
                    if (cbp & (1<<(5-i)) ) {
1340
                        if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1341
                            return -1;
1342
                    } else {
1343
                        s->block_last_index[i] = -1;
1344
                    }
1345
                }
1346
                if (s->chroma_format >= 2) {
1347
                    if (s->chroma_format == 2) {//CHROMA_422)
1348
                        for(i=6;i<8;i++) {
1349
                            if (cbp & (1<<(6+7-i)) ) {
1350
                                if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1351
                                    return -1;
1352
                            } else {
1353
                                s->block_last_index[i] = -1;
1354
                            }
1355
                        }
1356
                    }else{ /*CHROMA_444*/
1357
                        for(i=6;i<12;i++) {
1358
                            if (cbp & (1<<(6+11-i)) ) {
1359
                                if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1360
                                    return -1;
1361
                            } else {
1362
                                s->block_last_index[i] = -1;
1363
                            }
1364
                        }
1365
                    }
1366
                }
1367
            } else {
1368
                for(i=0;i<6;i++) {
1369
                    if (cbp & 32) {
1370
                        if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1371
                            return -1;
1372
                    } else {
1373
                        s->block_last_index[i] = -1;
1374
                    }
1375
                    cbp+=cbp;
1376
                }
1377
            }
1378
        }else{
1379
            for(i=0;i<6;i++)
1380
                s->block_last_index[i] = -1;
1381
        }
1382
    }
1383

    
1384
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1385

    
1386
    return 0;
1387
}
1388

    
1389
/* as h263, but only 17 codes */
1390
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1391
{
1392
    int code, sign, val, l, shift;
1393

    
1394
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1395
    if (code == 0) {
1396
        return pred;
1397
    }
1398
    if (code < 0) {
1399
        return 0xffff;
1400
    }
1401

    
1402
    sign = get_bits1(&s->gb);
1403
    shift = fcode - 1;
1404
    val = code;
1405
    if (shift) {
1406
        val = (val - 1) << shift;
1407
        val |= get_bits(&s->gb, shift);
1408
        val++;
1409
    }
1410
    if (sign)
1411
        val = -val;
1412
    val += pred;
1413
    
1414
    /* modulo decoding */
1415
    l = 1 << (shift+4);
1416
    val = ((val + l)&(l*2-1)) - l;
1417
    return val;
1418
}
1419

    
1420
static inline int decode_dc(GetBitContext *gb, int component)
1421
{
1422
    int code, diff;
1423

    
1424
    if (component == 0) {
1425
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1426
    } else {
1427
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1428
    }
1429
    if (code < 0){
1430
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1431
        return 0xffff;
1432
    }
1433
    if (code == 0) {
1434
        diff = 0;
1435
    } else {
1436
        diff = get_xbits(gb, code);
1437
    }
1438
    return diff;
1439
}
1440

    
1441
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1442
                               DCTELEM *block, 
1443
                               int n)
1444
{
1445
    int level, dc, diff, i, j, run;
1446
    int component;
1447
    RLTable *rl = &rl_mpeg1;
1448
    uint8_t * const scantable= s->intra_scantable.permutated;
1449
    const uint16_t *quant_matrix= s->intra_matrix;
1450
    const int qscale= s->qscale;
1451

    
1452
    /* DC coef */
1453
    component = (n <= 3 ? 0 : n - 4 + 1);
1454
    diff = decode_dc(&s->gb, component);
1455
    if (diff >= 0xffff)
1456
        return -1;
1457
    dc = s->last_dc[component];
1458
    dc += diff;
1459
    s->last_dc[component] = dc;
1460
    block[0] = dc<<3;
1461
    dprintf("dc=%d diff=%d\n", dc, diff);
1462
    i = 0;
1463
    {
1464
        OPEN_READER(re, &s->gb);    
1465
        /* now quantify & encode AC coefs */
1466
        for(;;) {
1467
            UPDATE_CACHE(re, &s->gb);
1468
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1469
            
1470
            if(level == 127){
1471
                break;
1472
            } else if(level != 0) {
1473
                i += run;
1474
                j = scantable[i];
1475
                level= (level*qscale*quant_matrix[j])>>4;
1476
                level= (level-1)|1;
1477
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1478
                LAST_SKIP_BITS(re, &s->gb, 1);
1479
            } else {
1480
                /* escape */
1481
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1482
                UPDATE_CACHE(re, &s->gb);
1483
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1484
                if (level == -128) {
1485
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1486
                } else if (level == 0) {
1487
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1488
                }
1489
                i += run;
1490
                j = scantable[i];
1491
                if(level<0){
1492
                    level= -level;
1493
                    level= (level*qscale*quant_matrix[j])>>4;
1494
                    level= (level-1)|1;
1495
                    level= -level;
1496
                }else{
1497
                    level= (level*qscale*quant_matrix[j])>>4;
1498
                    level= (level-1)|1;
1499
                }
1500
            }
1501
            if (i > 63){
1502
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1503
                return -1;
1504
            }
1505

    
1506
            block[j] = level;
1507
        }
1508
        CLOSE_READER(re, &s->gb);
1509
    }
1510
    s->block_last_index[n] = i;
1511
   return 0;
1512
}
1513

    
1514
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1515
                               DCTELEM *block, 
1516
                               int n)
1517
{
1518
    int level, i, j, run;
1519
    RLTable *rl = &rl_mpeg1;
1520
    uint8_t * const scantable= s->intra_scantable.permutated;
1521
    const uint16_t *quant_matrix= s->inter_matrix;
1522
    const int qscale= s->qscale;
1523

    
1524
    {
1525
        int v;
1526
        OPEN_READER(re, &s->gb);
1527
        i = -1;
1528
        /* special case for the first coef. no need to add a second vlc table */
1529
        UPDATE_CACHE(re, &s->gb);
1530
        v= SHOW_UBITS(re, &s->gb, 2);
1531
        if (v & 2) {
1532
            LAST_SKIP_BITS(re, &s->gb, 2);
1533
            level= (3*qscale*quant_matrix[0])>>5;
1534
            level= (level-1)|1;
1535
            if(v&1)
1536
                level= -level;
1537
            block[0] = level;
1538
            i++;
1539
        }
1540

    
1541
        /* now quantify & encode AC coefs */
1542
        for(;;) {
1543
            UPDATE_CACHE(re, &s->gb);
1544
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1545
            
1546
            if(level == 127){
1547
                break;
1548
            } else if(level != 0) {
1549
                i += run;
1550
                j = scantable[i];
1551
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1552
                level= (level-1)|1;
1553
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1554
                LAST_SKIP_BITS(re, &s->gb, 1);
1555
            } else {
1556
                /* escape */
1557
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1558
                UPDATE_CACHE(re, &s->gb);
1559
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1560
                if (level == -128) {
1561
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1562
                } else if (level == 0) {
1563
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1564
                }
1565
                i += run;
1566
                j = scantable[i];
1567
                if(level<0){
1568
                    level= -level;
1569
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1570
                    level= (level-1)|1;
1571
                    level= -level;
1572
                }else{
1573
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1574
                    level= (level-1)|1;
1575
                }
1576
            }
1577
            if (i > 63){
1578
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1579
                return -1;
1580
            }
1581

    
1582
            block[j] = level;
1583
        }
1584
        CLOSE_READER(re, &s->gb);
1585
    }
1586
    s->block_last_index[n] = i;
1587
    return 0;
1588
}
1589

    
1590
/* Also does unquantization here, since I will never support mpeg2
1591
   encoding */
1592
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1593
                               DCTELEM *block, 
1594
                               int n)
1595
{
1596
    int level, i, j, run;
1597
    RLTable *rl = &rl_mpeg1;
1598
    uint8_t * const scantable= s->intra_scantable.permutated;
1599
    const uint16_t *quant_matrix;
1600
    const int qscale= s->qscale;
1601
    int mismatch;
1602

    
1603
    mismatch = 1;
1604

    
1605
    {
1606
        int v;
1607
        OPEN_READER(re, &s->gb);
1608
        i = -1;
1609
        if (n < 4)
1610
            quant_matrix = s->inter_matrix;
1611
        else
1612
            quant_matrix = s->chroma_inter_matrix;
1613

    
1614
        /* special case for the first coef. no need to add a second vlc table */
1615
        UPDATE_CACHE(re, &s->gb);
1616
        v= SHOW_UBITS(re, &s->gb, 2);
1617
        if (v & 2) {
1618
            LAST_SKIP_BITS(re, &s->gb, 2);
1619
            level= (3*qscale*quant_matrix[0])>>5;
1620
            if(v&1)
1621
                level= -level;
1622
            block[0] = level;
1623
            mismatch ^= level;
1624
            i++;
1625
        }
1626

    
1627
        /* now quantify & encode AC coefs */
1628
        for(;;) {
1629
            UPDATE_CACHE(re, &s->gb);
1630
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1631
            
1632
            if(level == 127){
1633
                break;
1634
            } else if(level != 0) {
1635
                i += run;
1636
                j = scantable[i];
1637
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1638
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1639
                LAST_SKIP_BITS(re, &s->gb, 1);
1640
            } else {
1641
                /* escape */
1642
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1643
                UPDATE_CACHE(re, &s->gb);
1644
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1645

    
1646
                i += run;
1647
                j = scantable[i];
1648
                if(level<0){
1649
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1650
                    level= -level;
1651
                }else{
1652
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1653
                }
1654
            }
1655
            if (i > 63){
1656
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1657
                return -1;
1658
            }
1659
            
1660
            mismatch ^= level;
1661
            block[j] = level;
1662
        }
1663
        CLOSE_READER(re, &s->gb);
1664
    }
1665
    block[63] ^= (mismatch & 1);
1666
    
1667
    s->block_last_index[n] = i;
1668
    return 0;
1669
}
1670

    
1671
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1672
                               DCTELEM *block, 
1673
                               int n)
1674
{
1675
    int level, dc, diff, i, j, run;
1676
    int component;
1677
    RLTable *rl;
1678
    uint8_t * const scantable= s->intra_scantable.permutated;
1679
    const uint16_t *quant_matrix;
1680
    const int qscale= s->qscale;
1681
    int mismatch;
1682

    
1683
    /* DC coef */
1684
    if (n < 4){
1685
        quant_matrix = s->intra_matrix;
1686
        component = 0; 
1687
    }else{
1688
        quant_matrix = s->chroma_intra_matrix;
1689
        component = (n&1) + 1;
1690
    }
1691
    diff = decode_dc(&s->gb, component);
1692
    if (diff >= 0xffff)
1693
        return -1;
1694
    dc = s->last_dc[component];
1695
    dc += diff;
1696
    s->last_dc[component] = dc;
1697
    block[0] = dc << (3 - s->intra_dc_precision);
1698
    dprintf("dc=%d\n", block[0]);
1699
    mismatch = block[0] ^ 1;
1700
    i = 0;
1701
    if (s->intra_vlc_format)
1702
        rl = &rl_mpeg2;
1703
    else
1704
        rl = &rl_mpeg1;
1705

    
1706
    {
1707
        OPEN_READER(re, &s->gb);    
1708
        /* now quantify & encode AC coefs */
1709
        for(;;) {
1710
            UPDATE_CACHE(re, &s->gb);
1711
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1712
            
1713
            if(level == 127){
1714
                break;
1715
            } else if(level != 0) {
1716
                i += run;
1717
                j = scantable[i];
1718
                level= (level*qscale*quant_matrix[j])>>4;
1719
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1720
                LAST_SKIP_BITS(re, &s->gb, 1);
1721
            } else {
1722
                /* escape */
1723
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1724
                UPDATE_CACHE(re, &s->gb);
1725
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1726
                i += run;
1727
                j = scantable[i];
1728
                if(level<0){
1729
                    level= (-level*qscale*quant_matrix[j])>>4;
1730
                    level= -level;
1731
                }else{
1732
                    level= (level*qscale*quant_matrix[j])>>4;
1733
                }
1734
            }
1735
            if (i > 63){
1736
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1737
                return -1;
1738
            }
1739
            
1740
            mismatch^= level;
1741
            block[j] = level;
1742
        }
1743
        CLOSE_READER(re, &s->gb);
1744
    }
1745
    block[63]^= mismatch&1;
1746
    
1747
    s->block_last_index[n] = i;
1748
    return 0;
1749
}
1750

    
1751
typedef struct Mpeg1Context {
1752
    MpegEncContext mpeg_enc_ctx;
1753
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1754
    int repeat_field; /* true if we must repeat the field */
1755
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1756
    int slice_count;
1757
    int swap_uv;//indicate VCR2
1758
    int save_aspect_info;
1759

    
1760
} Mpeg1Context;
1761

    
1762
static int mpeg_decode_init(AVCodecContext *avctx)
1763
{
1764
    Mpeg1Context *s = avctx->priv_data;
1765
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1766
    
1767
    MPV_decode_defaults(s2);
1768
    
1769
    s->mpeg_enc_ctx.avctx= avctx;
1770
    s->mpeg_enc_ctx.flags= avctx->flags;
1771
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1772
    common_init(&s->mpeg_enc_ctx);
1773
    init_vlcs();
1774

    
1775
    s->mpeg_enc_ctx_allocated = 0;
1776
    s->mpeg_enc_ctx.picture_number = 0;
1777
    s->repeat_field = 0;
1778
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1779
    return 0;
1780
}
1781

    
1782
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, 
1783
                                     const uint8_t *new_perm){
1784
uint16_t temp_matrix[64];
1785
int i;
1786

    
1787
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1788
    
1789
    for(i=0;i<64;i++){
1790
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1791
    }      
1792
}
1793

    
1794
//Call this function when we know all parameters
1795
//it may be called in different places for mpeg1 and mpeg2
1796
static int mpeg_decode_postinit(AVCodecContext *avctx){
1797
Mpeg1Context *s1 = avctx->priv_data;
1798
MpegEncContext *s = &s1->mpeg_enc_ctx;
1799
uint8_t old_permutation[64];
1800

    
1801

    
1802
    if (
1803
            (s1->mpeg_enc_ctx_allocated == 0)|| 
1804
        avctx->width  != s->width ||
1805
        avctx->height != s->height||
1806
//      s1->save_aspect_info != avctx->aspect_ratio_info||
1807
        0)
1808
    {
1809
    
1810
        if (s1->mpeg_enc_ctx_allocated) {
1811
            MPV_common_end(s);
1812
        }
1813

    
1814
        if( (s->width == 0 )||(s->height == 0))
1815
            return -2;
1816

    
1817
        avctx->width = s->width;
1818
        avctx->height = s->height;
1819
        avctx->bit_rate = s->bit_rate;
1820
        s1->save_aspect_info = s->aspect_ratio_info;
1821

    
1822
     //low_delay may be forced, in this case we will have B frames
1823
     //that behave like P frames
1824
        avctx->has_b_frames = !(s->low_delay);
1825

    
1826
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1827
            //mpeg1 fps
1828
            avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
1829
            avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
1830
            //mpeg1 aspect
1831
            avctx->sample_aspect_ratio= av_d2q(
1832
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
1833

    
1834
        }else{//mpeg2
1835
        //mpeg2 fps
1836
            av_reduce(
1837
                &s->avctx->frame_rate, 
1838
                &s->avctx->frame_rate_base, 
1839
                frame_rate_tab[s->frame_rate_index].num * (s->frame_rate_ext_n+1),
1840
                frame_rate_tab[s->frame_rate_index].den * (s->frame_rate_ext_d+1),
1841
                1<<30);
1842
        //mpeg2 aspect
1843
            if(s->aspect_ratio_info > 1){
1844
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1845
                    s->avctx->sample_aspect_ratio= 
1846
                        av_div_q(
1847
                         mpeg2_aspect[s->aspect_ratio_info], 
1848
                         (AVRational){s->width, s->height}
1849
                         );
1850
                }else{
1851
                    s->avctx->sample_aspect_ratio= 
1852
                        av_div_q(
1853
                         mpeg2_aspect[s->aspect_ratio_info], 
1854
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1855
                        );
1856
                }
1857
            }else{
1858
                s->avctx->sample_aspect_ratio= 
1859
                    mpeg2_aspect[s->aspect_ratio_info];
1860
            }
1861
        }//mpeg2
1862

    
1863
        if(avctx->xvmc_acceleration){
1864
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1865
        }else{
1866
            if(s->chroma_format <  2){
1867
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1868
            }else
1869
            if(s->chroma_format == 2){
1870
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1871
            }else
1872
            if(s->chroma_format >  2){
1873
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1874
            }
1875
        }
1876
        //until then pix_fmt may be changed right after codec init
1877
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1878
            if( avctx->idct_algo == FF_IDCT_AUTO )
1879
                avctx->idct_algo = FF_IDCT_SIMPLE;
1880

    
1881
        //quantization matrixes may need reordering 
1882
        //if dct permutation is changed
1883
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1884

    
1885
        if (MPV_common_init(s) < 0)
1886
            return -2;
1887

    
1888
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1889
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1890
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1891
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1892

    
1893
        s1->mpeg_enc_ctx_allocated = 1;
1894
    }
1895
    return 0;
1896
}
1897

    
1898
/* return the 8 bit start code value and update the search
1899
   state. Return -1 if no start code found */
1900
static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1901
{
1902
    const uint8_t *buf_ptr= *pbuf_ptr;
1903

    
1904
    buf_ptr++; //gurantees that -1 is within the array
1905
    buf_end -= 2; // gurantees that +2 is within the array
1906

    
1907
    while (buf_ptr < buf_end) {
1908
        if(*buf_ptr==0){
1909
            while(buf_ptr < buf_end && buf_ptr[1]==0)
1910
                buf_ptr++;
1911

    
1912
            if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
1913
                *pbuf_ptr = buf_ptr+3;
1914
                return buf_ptr[2] + 0x100;
1915
            }
1916
        }
1917
        buf_ptr += 2;
1918
    }
1919
    buf_end += 2; //undo the hack above
1920
    
1921
    *pbuf_ptr = buf_end;
1922
    return -1;
1923
}
1924

    
1925
static int mpeg1_decode_picture(AVCodecContext *avctx, 
1926
                                const uint8_t *buf, int buf_size)
1927
{
1928
    Mpeg1Context *s1 = avctx->priv_data;
1929
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1930
    int ref, f_code, vbv_delay;
1931

    
1932
    if(mpeg_decode_postinit(s->avctx) < 0) 
1933
       return -2;
1934

    
1935
    init_get_bits(&s->gb, buf, buf_size*8);
1936

    
1937
    ref = get_bits(&s->gb, 10); /* temporal ref */
1938
    s->pict_type = get_bits(&s->gb, 3);
1939

    
1940
    vbv_delay= get_bits(&s->gb, 16);
1941
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1942
        s->full_pel[0] = get_bits1(&s->gb);
1943
        f_code = get_bits(&s->gb, 3);
1944
        if (f_code == 0)
1945
            return -1;
1946
        s->mpeg_f_code[0][0] = f_code;
1947
        s->mpeg_f_code[0][1] = f_code;
1948
    }
1949
    if (s->pict_type == B_TYPE) {
1950
        s->full_pel[1] = get_bits1(&s->gb);
1951
        f_code = get_bits(&s->gb, 3);
1952
        if (f_code == 0)
1953
            return -1;
1954
        s->mpeg_f_code[1][0] = f_code;
1955
        s->mpeg_f_code[1][1] = f_code;
1956
    }
1957
    s->current_picture.pict_type= s->pict_type;
1958
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1959
    
1960
//    if(avctx->debug & FF_DEBUG_PICT_INFO)
1961
//        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
1962
    
1963
    s->y_dc_scale = 8;
1964
    s->c_dc_scale = 8;
1965
    s->first_slice = 1;
1966
    return 0;
1967
}
1968

    
1969
static void mpeg_decode_sequence_extension(MpegEncContext *s)
1970
{
1971
    int horiz_size_ext, vert_size_ext;
1972
    int bit_rate_ext;
1973
    int level, profile;
1974

    
1975
    skip_bits(&s->gb, 1); /* profil and level esc*/
1976
    profile= get_bits(&s->gb, 3);
1977
    level= get_bits(&s->gb, 4);
1978
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1979
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1980
    horiz_size_ext = get_bits(&s->gb, 2);
1981
    vert_size_ext = get_bits(&s->gb, 2);
1982
    s->width |= (horiz_size_ext << 12);
1983
    s->height |= (vert_size_ext << 12);
1984
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1985
    s->bit_rate += (bit_rate_ext << 12) * 400;
1986
    skip_bits1(&s->gb); /* marker */
1987
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1988

    
1989
    s->low_delay = get_bits1(&s->gb);
1990
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1991

    
1992
    s->frame_rate_ext_n = get_bits(&s->gb, 2);
1993
    s->frame_rate_ext_d = get_bits(&s->gb, 5);
1994

    
1995
    dprintf("sequence extension\n");
1996
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1997
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1998

    
1999
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2000
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
2001
               profile, level, s->avctx->rc_buffer_size, s->bit_rate);
2002

    
2003
}
2004

    
2005
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2006
{
2007
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2008
    int color_description, w, h;
2009

    
2010
    skip_bits(&s->gb, 3); /* video format */
2011
    color_description= get_bits1(&s->gb);
2012
    if(color_description){
2013
        skip_bits(&s->gb, 8); /* color primaries */
2014
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2015
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2016
    }
2017
    w= get_bits(&s->gb, 14);
2018
    skip_bits(&s->gb, 1); //marker
2019
    h= get_bits(&s->gb, 14);
2020
    skip_bits(&s->gb, 1); //marker
2021
    
2022
    s1->pan_scan.width= 16*w;
2023
    s1->pan_scan.height=16*h;
2024
        
2025
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2026
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2027
}
2028

    
2029
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2030
{
2031
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2032
    int i,nofco;
2033

    
2034
    nofco = 1;
2035
    if(s->progressive_sequence){
2036
        if(s->repeat_first_field){
2037
            nofco++;
2038
            if(s->top_field_first)
2039
                nofco++;        
2040
        }
2041
    }else{
2042
        if(s->picture_structure == PICT_FRAME){
2043
            nofco++;
2044
            if(s->repeat_first_field)
2045
                nofco++;
2046
        }
2047
    }
2048
    for(i=0; i<nofco; i++){
2049
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2050
        skip_bits(&s->gb, 1); //marker
2051
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2052
        skip_bits(&s->gb, 1); //marker
2053
    }
2054
   
2055
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2056
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
2057
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
2058
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
2059
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2060
        );
2061
}
2062

    
2063
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2064
{
2065
    int i, v, j;
2066

    
2067
    dprintf("matrix extension\n");
2068

    
2069
    if (get_bits1(&s->gb)) {
2070
        for(i=0;i<64;i++) {
2071
            v = get_bits(&s->gb, 8);
2072
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2073
            s->intra_matrix[j] = v;
2074
            s->chroma_intra_matrix[j] = v;
2075
        }
2076
    }
2077
    if (get_bits1(&s->gb)) {
2078
        for(i=0;i<64;i++) {
2079
            v = get_bits(&s->gb, 8);
2080
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2081
            s->inter_matrix[j] = v;
2082
            s->chroma_inter_matrix[j] = v;
2083
        }
2084
    }
2085
    if (get_bits1(&s->gb)) {
2086
        for(i=0;i<64;i++) {
2087
            v = get_bits(&s->gb, 8);
2088
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2089
            s->chroma_intra_matrix[j] = v;
2090
        }
2091
    }
2092
    if (get_bits1(&s->gb)) {
2093
        for(i=0;i<64;i++) {
2094
            v = get_bits(&s->gb, 8);
2095
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2096
            s->chroma_inter_matrix[j] = v;
2097
        }
2098
    }
2099
}
2100

    
2101
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2102
{
2103
    s->full_pel[0] = s->full_pel[1] = 0;
2104
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2105
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2106
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2107
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2108
    s->intra_dc_precision = get_bits(&s->gb, 2);
2109
    s->picture_structure = get_bits(&s->gb, 2);
2110
    s->top_field_first = get_bits1(&s->gb);
2111
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2112
    s->concealment_motion_vectors = get_bits1(&s->gb);
2113
    s->q_scale_type = get_bits1(&s->gb);
2114
    s->intra_vlc_format = get_bits1(&s->gb);
2115
    s->alternate_scan = get_bits1(&s->gb);
2116
    s->repeat_first_field = get_bits1(&s->gb);
2117
    s->chroma_420_type = get_bits1(&s->gb);
2118
    s->progressive_frame = get_bits1(&s->gb);
2119

    
2120
    if(s->picture_structure == PICT_FRAME)
2121
        s->first_field=0;
2122
    else{
2123
        s->first_field ^= 1;
2124
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2125
    }
2126
    
2127
    if(s->alternate_scan){
2128
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2129
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2130
    }else{
2131
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2132
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2133
    }
2134
    
2135
    /* composite display not parsed */
2136
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2137
    dprintf("picture_structure=%d\n", s->picture_structure);
2138
    dprintf("top field first=%d\n", s->top_field_first);
2139
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2140
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2141
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2142
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2143
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2144
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2145
}
2146

    
2147
static void mpeg_decode_extension(AVCodecContext *avctx, 
2148
                                  const uint8_t *buf, int buf_size)
2149
{
2150
    Mpeg1Context *s1 = avctx->priv_data;
2151
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2152
    int ext_type;
2153

    
2154
    init_get_bits(&s->gb, buf, buf_size*8);
2155
    
2156
    ext_type = get_bits(&s->gb, 4);
2157
    switch(ext_type) {
2158
    case 0x1:
2159
        mpeg_decode_sequence_extension(s);
2160
        break;
2161
    case 0x2:
2162
        mpeg_decode_sequence_display_extension(s1);
2163
        break;
2164
    case 0x3:
2165
        mpeg_decode_quant_matrix_extension(s);
2166
        break;
2167
    case 0x7:
2168
        mpeg_decode_picture_display_extension(s1);
2169
        break;
2170
    case 0x8:
2171
        mpeg_decode_picture_coding_extension(s);
2172
        break;
2173
    }
2174
}
2175

    
2176
static void exchange_uv(MpegEncContext *s){
2177
short * tmp;
2178

    
2179
    tmp = s->pblocks[4];
2180
    s->pblocks[4] = s->pblocks[5];
2181
    s->pblocks[5] = tmp;
2182
}
2183

    
2184
static int mpeg_field_start(MpegEncContext *s){
2185
    AVCodecContext *avctx= s->avctx;
2186
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2187

    
2188
    /* start frame decoding */
2189
    if(s->first_field || s->picture_structure==PICT_FRAME){
2190
        if(MPV_frame_start(s, avctx) < 0)
2191
            return -1;
2192

    
2193
        ff_er_frame_start(s);
2194

    
2195
        /* first check if we must repeat the frame */
2196
        s->current_picture_ptr->repeat_pict = 0;
2197
        if (s->repeat_first_field) {
2198
            if (s->progressive_sequence) {
2199
                if (s->top_field_first)
2200
                    s->current_picture_ptr->repeat_pict = 4;
2201
                else
2202
                    s->current_picture_ptr->repeat_pict = 2;
2203
            } else if (s->progressive_frame) {
2204
                s->current_picture_ptr->repeat_pict = 1;
2205
            }
2206
        }         
2207

    
2208
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2209
    }else{ //second field
2210
            int i;
2211
            
2212
            if(!s->current_picture_ptr){
2213
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2214
                return -1;
2215
            }
2216
            
2217
            for(i=0; i<4; i++){
2218
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2219
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2220
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2221
                } 
2222
            }
2223
    }
2224
#ifdef HAVE_XVMC
2225
// MPV_frame_start will call this function too,
2226
// but we need to call it on every field
2227
    if(s->avctx->xvmc_acceleration)
2228
         XVMC_field_start(s,avctx);
2229
#endif
2230

    
2231
    return 0;
2232
}
2233

    
2234
#define DECODE_SLICE_ERROR -1
2235
#define DECODE_SLICE_OK 0
2236

    
2237
/**
2238
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2239
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2240
 *         DECODE_SLICE_OK if this slice is ok<br>
2241
 */
2242
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2243
                             const uint8_t **buf, int buf_size)
2244
{
2245
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2246
    AVCodecContext *avctx= s->avctx;
2247
    int ret;
2248
    const int field_pic= s->picture_structure != PICT_FRAME;
2249

    
2250
    s->resync_mb_x=
2251
    s->resync_mb_y= -1;
2252

    
2253
    if (mb_y >= s->mb_height){
2254
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", s->mb_y, s->mb_height);
2255
        return -1;
2256
    }
2257
    
2258
    init_get_bits(&s->gb, *buf, buf_size*8);
2259

    
2260
    ff_mpeg1_clean_buffers(s);
2261
    s->interlaced_dct = 0;
2262

    
2263
    s->qscale = get_qscale(s);
2264

    
2265
    if(s->qscale == 0){
2266
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2267
        return -1;
2268
    }
2269
    
2270
    /* extra slice info */
2271
    while (get_bits1(&s->gb) != 0) {
2272
        skip_bits(&s->gb, 8);
2273
    }
2274
    
2275
    s->mb_x=0;
2276

    
2277
    for(;;) {
2278
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2279
        if (code < 0){
2280
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2281
            return -1;
2282
        }
2283
        if (code >= 33) {
2284
            if (code == 33) {
2285
                s->mb_x += 33;
2286
            }
2287
            /* otherwise, stuffing, nothing to do */
2288
        } else {
2289
            s->mb_x += code;
2290
            break;
2291
        }
2292
    }
2293

    
2294
    s->resync_mb_x= s->mb_x;
2295
    s->resync_mb_y= s->mb_y= mb_y;
2296
    s->mb_skip_run= 0;
2297
    ff_init_block_index(s);
2298

    
2299
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2300
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2301
             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", 
2302
                 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],
2303
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2304
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2305
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2306
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2307
        }
2308
    }    
2309
    
2310
    for(;;) {
2311
#ifdef HAVE_XVMC
2312
        //one 1 we memcpy blocks in xvmcvideo
2313
        if(s->avctx->xvmc_acceleration > 1)
2314
            XVMC_init_block(s);//set s->block
2315
#endif
2316

    
2317
        s->dsp.clear_blocks(s->block[0]);
2318

    
2319
        ret = mpeg_decode_mb(s, s->block);
2320
        s->chroma_qscale= s->qscale;
2321

    
2322
        dprintf("ret=%d\n", ret);
2323
        if (ret < 0)
2324
            return -1;
2325

    
2326
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2327
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2328
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2329
            int motion_x, motion_y, dir, i;
2330
            if(field_pic && !s->first_field)
2331
                xy += wrap/2;
2332

    
2333
            for(i=0; i<2; i++){
2334
                for(dir=0; dir<2; dir++){
2335
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2336
                        motion_x = motion_y = 0;
2337
                    }else if (s->mv_type == MV_TYPE_16X16){
2338
                        motion_x = s->mv[dir][0][0];
2339
                        motion_y = s->mv[dir][0][1];
2340
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2341
                        motion_x = s->mv[dir][i][0];
2342
                        motion_y = s->mv[dir][i][1];
2343
                    }
2344
                    
2345
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2346
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2347
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2348
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2349
                }
2350
                xy += wrap;
2351
            }
2352
        }
2353

    
2354
        s->dest[0] += 16;
2355
        s->dest[1] += 8;
2356
        s->dest[2] += 8;
2357

    
2358
        MPV_decode_mb(s, s->block);
2359
        
2360
        if (++s->mb_x >= s->mb_width) {
2361

    
2362
            ff_draw_horiz_band(s, 16*s->mb_y, 16);
2363

    
2364
            s->mb_x = 0;
2365
            s->mb_y++;
2366

    
2367
            if(s->mb_y<<field_pic >= s->mb_height){
2368
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2369

    
2370
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2371
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2372
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2373
                    return -1;
2374
                }else
2375
                    goto eos;
2376
            }
2377
            
2378
            ff_init_block_index(s);
2379
        }
2380

    
2381
        /* skip mb handling */
2382
        if (s->mb_skip_run == -1) {
2383
            /* read again increment */
2384
            s->mb_skip_run = 0;
2385
            for(;;) {
2386
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2387
                if (code < 0){
2388
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2389
                    return -1;
2390
                }
2391
                if (code >= 33) {
2392
                    if (code == 33) {
2393
                        s->mb_skip_run += 33;
2394
                    }else if(code == 35){
2395
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2396
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2397
                            return -1;
2398
                        }
2399
                        goto eos; /* end of slice */
2400
                    }
2401
                    /* otherwise, stuffing, nothing to do */
2402
                } else {
2403
                    s->mb_skip_run += code;
2404
                    break;
2405
                }
2406
            }
2407
        }
2408
    }
2409
eos: // end of slice
2410
    *buf += get_bits_count(&s->gb)/8 - 1;
2411
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2412
    return 0;
2413
}
2414

    
2415
static int slice_decode_thread(AVCodecContext *c, void *arg){
2416
    MpegEncContext *s= arg;
2417
    const uint8_t *buf= s->gb.buffer;
2418
    int mb_y= s->start_mb_y;
2419

    
2420
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2421

    
2422
    for(;;){
2423
        int start_code, ret;
2424

    
2425
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2426
        emms_c();
2427
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2428
//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);
2429
        if(ret < 0){
2430
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2431
                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);
2432
        }else{
2433
            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);
2434
        }
2435
        
2436
        if(s->mb_y == s->end_mb_y)
2437
            return 0;
2438
        
2439
        start_code = find_start_code(&buf, s->gb.buffer_end);
2440
        mb_y= start_code - SLICE_MIN_START_CODE;
2441
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2442
            return -1;
2443
    }
2444
    
2445
    return 0; //not reached
2446
}
2447

    
2448
/**
2449
 * handles slice ends.
2450
 * @return 1 if it seems to be the last slice of 
2451
 */
2452
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2453
{
2454
    Mpeg1Context *s1 = avctx->priv_data;
2455
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2456
       
2457
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2458
        return 0;
2459

    
2460
#ifdef HAVE_XVMC
2461
    if(s->avctx->xvmc_acceleration)
2462
        XVMC_field_end(s);
2463
#endif
2464
    /* end of slice reached */
2465
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2466
        /* end of image */
2467

    
2468
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2469

    
2470
        ff_er_frame_end(s);
2471

    
2472
        MPV_frame_end(s);
2473

    
2474
        if (s->pict_type == B_TYPE || s->low_delay) {
2475
            *pict= *(AVFrame*)s->current_picture_ptr;
2476
            ff_print_debug_info(s, pict);
2477
        } else {
2478
            s->picture_number++;
2479
            /* latency of 1 frame for I and P frames */
2480
            /* XXX: use another variable than picture_number */
2481
            if (s->last_picture_ptr != NULL) {
2482
                *pict= *(AVFrame*)s->last_picture_ptr;
2483
                 ff_print_debug_info(s, pict);
2484
            }
2485
        }
2486

    
2487
        return 1;
2488
    } else {
2489
        return 0;
2490
    }
2491
}
2492

    
2493
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2494
                                 const uint8_t *buf, int buf_size)
2495
{
2496
    Mpeg1Context *s1 = avctx->priv_data;
2497
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2498
    int width,height;
2499
    int i, v, j;
2500

    
2501
    init_get_bits(&s->gb, buf, buf_size*8);
2502

    
2503
    width = get_bits(&s->gb, 12);
2504
    height = get_bits(&s->gb, 12);
2505
    if (width <= 0 || height <= 0 ||
2506
        (width % 2) != 0 || (height % 2) != 0)
2507
        return -1;
2508
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2509
    if (s->aspect_ratio_info == 0)
2510
        return -1;
2511
    s->frame_rate_index = get_bits(&s->gb, 4);
2512
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2513
        return -1;
2514
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2515
    if (get_bits1(&s->gb) == 0) /* marker */
2516
        return -1;
2517
    s->width = width;
2518
    s->height = height;
2519

    
2520
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2521
    skip_bits(&s->gb, 1);
2522

    
2523
    /* get matrix */
2524
    if (get_bits1(&s->gb)) {
2525
        for(i=0;i<64;i++) {
2526
            v = get_bits(&s->gb, 8);
2527
            if(v==0){
2528
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2529
                return -1;
2530
            }
2531
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2532
            s->intra_matrix[j] = v;
2533
            s->chroma_intra_matrix[j] = v;
2534
        }
2535
#ifdef DEBUG
2536
        dprintf("intra matrix present\n");
2537
        for(i=0;i<64;i++)
2538
            dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]);
2539
        printf("\n");
2540
#endif
2541
    } else {
2542
        for(i=0;i<64;i++) {
2543
            j = s->dsp.idct_permutation[i];
2544
            v = ff_mpeg1_default_intra_matrix[i];
2545
            s->intra_matrix[j] = v;
2546
            s->chroma_intra_matrix[j] = v;
2547
        }
2548
    }
2549
    if (get_bits1(&s->gb)) {
2550
        for(i=0;i<64;i++) {
2551
            v = get_bits(&s->gb, 8);
2552
            if(v==0){
2553
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2554
                return -1;
2555
            }
2556
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2557
            s->inter_matrix[j] = v;
2558
            s->chroma_inter_matrix[j] = v;
2559
        }
2560
#ifdef DEBUG
2561
        dprintf("non intra matrix present\n");
2562
        for(i=0;i<64;i++)
2563
            dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]);
2564
        printf("\n");
2565
#endif
2566
    } else {
2567
        for(i=0;i<64;i++) {
2568
            int j= s->dsp.idct_permutation[i];
2569
            v = ff_mpeg1_default_non_intra_matrix[i];
2570
            s->inter_matrix[j] = v;
2571
            s->chroma_inter_matrix[j] = v;
2572
        }
2573
    }
2574
    
2575
    if(show_bits(&s->gb, 23) != 0){
2576
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2577
        return -1;
2578
    }
2579

    
2580
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2581
    s->progressive_sequence = 1;
2582
    s->progressive_frame = 1;
2583
    s->picture_structure = PICT_FRAME;
2584
    s->frame_pred_frame_dct = 1;
2585
    s->chroma_format = 1;
2586
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2587
    avctx->sub_id = 1; /* indicates mpeg1 */
2588
    s->out_format = FMT_MPEG1;
2589
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2590
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2591
    
2592
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2593
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2594
               s->avctx->rc_buffer_size, s->bit_rate);
2595
    
2596
    return 0;
2597
}
2598

    
2599
static int vcr2_init_sequence(AVCodecContext *avctx)
2600
{
2601
    Mpeg1Context *s1 = avctx->priv_data;
2602
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2603
    int i, v;
2604

    
2605
    /* start new mpeg1 context decoding */
2606
    s->out_format = FMT_MPEG1;
2607
    if (s1->mpeg_enc_ctx_allocated) {
2608
        MPV_common_end(s);
2609
    }
2610
    s->width = avctx->width;
2611
    s->height = avctx->height;
2612
    avctx->has_b_frames= 0; //true?
2613
    s->low_delay= 1;
2614

    
2615
    if(avctx->xvmc_acceleration){
2616
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2617
    }else{
2618
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2619
    }
2620

    
2621
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2622
        if( avctx->idct_algo == FF_IDCT_AUTO )
2623
            avctx->idct_algo = FF_IDCT_SIMPLE;
2624
    
2625
    if (MPV_common_init(s) < 0)
2626
        return -1;
2627
    exchange_uv(s);//common init reset pblocks, so we swap them here
2628
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2629
    s1->mpeg_enc_ctx_allocated = 1;
2630

    
2631
    for(i=0;i<64;i++) {
2632
        int j= s->dsp.idct_permutation[i];
2633
        v = ff_mpeg1_default_intra_matrix[i];
2634
        s->intra_matrix[j] = v;
2635
        s->chroma_intra_matrix[j] = v;
2636

    
2637
        v = ff_mpeg1_default_non_intra_matrix[i];
2638
        s->inter_matrix[j] = v;
2639
        s->chroma_inter_matrix[j] = v;
2640
    }
2641

    
2642
    s->progressive_sequence = 1;
2643
    s->progressive_frame = 1;
2644
    s->picture_structure = PICT_FRAME;
2645
    s->frame_pred_frame_dct = 1;
2646
    s->chroma_format = 1;
2647
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2648
    avctx->sub_id = 2; /* indicates mpeg2 */
2649
    return 0;
2650
}
2651

    
2652

    
2653
static void mpeg_decode_user_data(AVCodecContext *avctx, 
2654
                                  const uint8_t *buf, int buf_size)
2655
{
2656
    const uint8_t *p;
2657
    int len, flags;
2658
    p = buf;
2659
    len = buf_size;
2660

    
2661
    /* we parse the DTG active format information */
2662
    if (len >= 5 &&
2663
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2664
        flags = p[4];
2665
        p += 5;
2666
        len -= 5;
2667
        if (flags & 0x80) {
2668
            /* skip event id */
2669
            if (len < 2)
2670
                return;
2671
            p += 2;
2672
            len -= 2;
2673
        }
2674
        if (flags & 0x40) {
2675
            if (len < 1)
2676
                return;
2677
            avctx->dtg_active_format = p[0] & 0x0f;
2678
        }
2679
    }
2680
}
2681

    
2682
static void mpeg_decode_gop(AVCodecContext *avctx, 
2683
                            const uint8_t *buf, int buf_size){
2684
    Mpeg1Context *s1 = avctx->priv_data;
2685
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2686

    
2687
    int drop_frame_flag;
2688
    int time_code_hours, time_code_minutes;
2689
    int time_code_seconds, time_code_pictures;
2690
    int broken_link;
2691

    
2692
    init_get_bits(&s->gb, buf, buf_size*8);
2693

    
2694
    drop_frame_flag = get_bits1(&s->gb);
2695
    
2696
    time_code_hours=get_bits(&s->gb,5);
2697
    time_code_minutes = get_bits(&s->gb,6);
2698
    skip_bits1(&s->gb);//marker bit
2699
    time_code_seconds = get_bits(&s->gb,6);
2700
    time_code_pictures = get_bits(&s->gb,6);
2701

    
2702
    /*broken_link indicate that after editing the
2703
      reference frames of the first B-Frames after GOP I-Frame
2704
      are missing (open gop)*/
2705
    broken_link = get_bits1(&s->gb);
2706

    
2707
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2708
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2709
            time_code_hours, time_code_minutes, time_code_seconds,
2710
            time_code_pictures, broken_link);
2711
}
2712
/**
2713
 * finds the end of the current frame in the bitstream.
2714
 * @return the position of the first byte of the next frame, or -1
2715
 */
2716
static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2717
    ParseContext *pc= &s->parse_context;
2718
    int i;
2719
    uint32_t state;
2720
    
2721
    state= pc->state;
2722
    
2723
    i=0;
2724
    if(!pc->frame_start_found){
2725
        for(i=0; i<buf_size; i++){
2726
            state= (state<<8) | buf[i];
2727
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2728
                i++;
2729
                pc->frame_start_found=1;
2730
                break;
2731
            }
2732
        }
2733
    }
2734
    
2735
    if(pc->frame_start_found){
2736
        for(; i<buf_size; i++){
2737
            state= (state<<8) | buf[i];
2738
            if((state&0xFFFFFF00) == 0x100){
2739
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2740
                    pc->frame_start_found=0;
2741
                    pc->state=-1; 
2742
                    return i-3;
2743
                }
2744
            }
2745
        }
2746
    }        
2747
    pc->state= state;
2748
    return END_NOT_FOUND;
2749
}
2750

    
2751
/* handle buffering and image synchronisation */
2752
static int mpeg_decode_frame(AVCodecContext *avctx, 
2753
                             void *data, int *data_size,
2754
                             uint8_t *buf, int buf_size)
2755
{
2756
    Mpeg1Context *s = avctx->priv_data;
2757
    const uint8_t *buf_end;
2758
    const uint8_t *buf_ptr;
2759
    int ret, start_code, input_size;
2760
    AVFrame *picture = data;
2761
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2762
    dprintf("fill_buffer\n");
2763

    
2764
    *data_size = 0;
2765

    
2766
    /* special case for last picture */
2767
    if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2768
        *picture= *(AVFrame*)s2->next_picture_ptr;
2769
        s2->next_picture_ptr= NULL;
2770

    
2771
        *data_size = sizeof(AVFrame);
2772
        return 0;
2773
    }
2774

    
2775
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2776
        int next= mpeg1_find_frame_end(s2, buf, buf_size);
2777
        
2778
        if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2779
            return buf_size;
2780
    }    
2781
    
2782
    buf_ptr = buf;
2783
    buf_end = buf + buf_size;
2784

    
2785
#if 0    
2786
    if (s->repeat_field % 2 == 1) { 
2787
        s->repeat_field++;
2788
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2789
        //        s2->picture_number, s->repeat_field);
2790
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2791
            *data_size = sizeof(AVPicture);
2792
            goto the_end;
2793
        }
2794
    }
2795
#endif
2796

    
2797
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2798
        vcr2_init_sequence(avctx);
2799
    
2800
    s->slice_count= 0;
2801
        
2802
    for(;;) {
2803
        /* find start next code */
2804
        start_code = find_start_code(&buf_ptr, buf_end);
2805
        if (start_code < 0){
2806
            if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2807
                if(avctx->thread_count > 1){
2808
                    int i;
2809

    
2810
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2811
                    for(i=0; i<s->slice_count; i++)
2812
                        s2->error_count += s2->thread_context[i]->error_count;
2813
                }
2814
                if (slice_end(avctx, picture)) {
2815
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2816
                        *data_size = sizeof(AVPicture);
2817
                }
2818
            }
2819
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2820
        }
2821
        
2822
        input_size = buf_end - buf_ptr;
2823

    
2824
        if(avctx->debug & FF_DEBUG_STARTCODE){
2825
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2826
        }
2827

    
2828
                /* prepare data for next start code */
2829
                switch(start_code) {
2830
                case SEQ_START_CODE:
2831
                    mpeg1_decode_sequence(avctx, buf_ptr, 
2832
                                          input_size);
2833
                    break;
2834
                            
2835
                case PICTURE_START_CODE:
2836
                    /* we have a complete image : we try to decompress it */
2837
                    mpeg1_decode_picture(avctx, 
2838
                                         buf_ptr, input_size);
2839
                    break;
2840
                case EXT_START_CODE:
2841
                    mpeg_decode_extension(avctx,
2842
                                          buf_ptr, input_size);
2843
                    break;
2844
                case USER_START_CODE:
2845
                    mpeg_decode_user_data(avctx, 
2846
                                          buf_ptr, input_size);
2847
                    break;
2848
                case GOP_START_CODE:
2849
                    s2->first_field=0;
2850
                    mpeg_decode_gop(avctx, 
2851
                                          buf_ptr, input_size);
2852
                    break;
2853
                default:
2854
                    if (start_code >= SLICE_MIN_START_CODE &&
2855
                        start_code <= SLICE_MAX_START_CODE) {
2856
                        int mb_y= start_code - SLICE_MIN_START_CODE;
2857
                        
2858
                        /* skip b frames if we dont have reference frames */
2859
                        if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2860
                        /* skip b frames if we are in a hurry */
2861
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2862
                        /* skip everything if we are in a hurry>=5 */
2863
                        if(avctx->hurry_up>=5) break;
2864
                        
2865
                        if (!s->mpeg_enc_ctx_allocated) break;
2866
                        
2867
                        if(s2->first_slice){
2868
                            s2->first_slice=0;
2869
                            if(mpeg_field_start(s2) < 0)
2870
                                return -1;
2871
                        }
2872
                        
2873
                        if(avctx->thread_count > 1){
2874
                            int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2875
                            if(threshold <= mb_y){
2876
                                MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2877
                                
2878
                                thread_context->start_mb_y= mb_y;
2879
                                thread_context->end_mb_y  = s2->mb_height;
2880
                                if(s->slice_count){
2881
                                    s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2882
                                    ff_update_duplicate_context(thread_context, s2);
2883
                                }
2884
                                init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2885
                                s->slice_count++;
2886
                            }
2887
                            buf_ptr += 2; //FIXME add minimum num of bytes per slice
2888
                        }else{
2889
                            ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2890
                            emms_c();
2891

    
2892
                            if(ret < 0){
2893
                                if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2894
                                    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);
2895
                            }else{
2896
                                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);
2897
                            }
2898
                        }
2899
                    }
2900
                    break;
2901
                }
2902
    }
2903
}
2904

    
2905
static int mpeg_decode_end(AVCodecContext *avctx)
2906
{
2907
    Mpeg1Context *s = avctx->priv_data;
2908

    
2909
    if (s->mpeg_enc_ctx_allocated)
2910
        MPV_common_end(&s->mpeg_enc_ctx);
2911
    return 0;
2912
}
2913

    
2914
AVCodec mpeg1video_decoder = {
2915
    "mpeg1video",
2916
    CODEC_TYPE_VIDEO,
2917
    CODEC_ID_MPEG1VIDEO,
2918
    sizeof(Mpeg1Context),
2919
    mpeg_decode_init,
2920
    NULL,
2921
    mpeg_decode_end,
2922
    mpeg_decode_frame,
2923
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2924
    .flush= ff_mpeg_flush,
2925
};
2926

    
2927
AVCodec mpeg2video_decoder = {
2928
    "mpeg2video",
2929
    CODEC_TYPE_VIDEO,
2930
    CODEC_ID_MPEG2VIDEO,
2931
    sizeof(Mpeg1Context),
2932
    mpeg_decode_init,
2933
    NULL,
2934
    mpeg_decode_end,
2935
    mpeg_decode_frame,
2936
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2937
    .flush= ff_mpeg_flush,
2938
};
2939

    
2940
//legacy decoder
2941
AVCodec mpegvideo_decoder = {
2942
    "mpegvideo",
2943
    CODEC_TYPE_VIDEO,
2944
    CODEC_ID_MPEG2VIDEO,
2945
    sizeof(Mpeg1Context),
2946
    mpeg_decode_init,
2947
    NULL,
2948
    mpeg_decode_end,
2949
    mpeg_decode_frame,
2950
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2951
    .flush= ff_mpeg_flush,
2952
};
2953

    
2954
#ifdef CONFIG_ENCODERS
2955

    
2956
AVCodec mpeg1video_encoder = {
2957
    "mpeg1video",
2958
    CODEC_TYPE_VIDEO,
2959
    CODEC_ID_MPEG1VIDEO,
2960
    sizeof(MpegEncContext),
2961
    encode_init,
2962
    MPV_encode_picture,
2963
    MPV_encode_end,
2964
    .supported_framerates= frame_rate_tab+1,
2965
};
2966

    
2967
#ifdef CONFIG_RISKY
2968

    
2969
AVCodec mpeg2video_encoder = {
2970
    "mpeg2video",
2971
    CODEC_TYPE_VIDEO,
2972
    CODEC_ID_MPEG2VIDEO,
2973
    sizeof(MpegEncContext),
2974
    encode_init,
2975
    MPV_encode_picture,
2976
    MPV_encode_end,
2977
    .supported_framerates= frame_rate_tab+1,
2978
};
2979
#endif
2980
#endif
2981

    
2982
#ifdef HAVE_XVMC
2983
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2984
    Mpeg1Context *s;
2985

    
2986
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2987
        return -1;
2988
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2989
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2990
    }
2991
    mpeg_decode_init(avctx);
2992
    s = avctx->priv_data;
2993

    
2994
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2995
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2996

    
2997
    return 0;
2998
}
2999

    
3000
AVCodec mpeg_xvmc_decoder = {
3001
    "mpegvideo_xvmc",
3002
    CODEC_TYPE_VIDEO,
3003
    CODEC_ID_MPEG2VIDEO_XVMC,
3004
    sizeof(Mpeg1Context),
3005
    mpeg_mc_decode_init,
3006
    NULL,
3007
    mpeg_decode_end,
3008
    mpeg_decode_frame,
3009
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
3010
    .flush= ff_mpeg_flush,
3011
};
3012

    
3013
#endif
3014

    
3015
/* this is ugly i know, but the alternative is too make 
3016
   hundreds of vars global and prefix them with ff_mpeg1_
3017
   which is far uglier. */
3018
#include "mdec.c"