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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 n, 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
    s->y_dc_scale_table=
362
    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
363
}
364

    
365
void ff_mpeg1_clean_buffers(MpegEncContext *s){
366
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
367
    s->last_dc[1] = s->last_dc[0];
368
    s->last_dc[2] = s->last_dc[0];
369
    memset(s->last_mv, 0, sizeof(s->last_mv));
370
}
371

    
372
#ifdef CONFIG_ENCODERS
373

    
374
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
375
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
376
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
377
    put_bits(&s->pb, 1, 0); /* slice extra information */
378
}
379

    
380
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
381
{
382
    mpeg1_encode_sequence_header(s);
383

    
384
    /* mpeg1 picture header */
385
    put_header(s, PICTURE_START_CODE);
386
    /* temporal reference */
387

    
388
    // RAL: s->picture_number instead of s->fake_picture_number
389
    put_bits(&s->pb, 10, (s->picture_number - 
390
                          s->gop_picture_number) & 0x3ff); 
391
    put_bits(&s->pb, 3, s->pict_type);
392

    
393
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
394
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
395
    
396
    // RAL: Forward f_code also needed for B frames
397
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
398
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
399
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
400
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
401
        else
402
            put_bits(&s->pb, 3, 7); /* forward_f_code */
403
    }
404
    
405
    // RAL: Backward f_code necessary for B frames
406
    if (s->pict_type == B_TYPE) {
407
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
408
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
409
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
410
        else
411
            put_bits(&s->pb, 3, 7); /* backward_f_code */
412
    }
413

    
414
    put_bits(&s->pb, 1, 0); /* extra bit picture */
415

    
416
    s->frame_pred_frame_dct = 1;
417
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
418
        put_header(s, EXT_START_CODE);
419
        put_bits(&s->pb, 4, 8); //pic ext
420
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
421
            put_bits(&s->pb, 4, s->f_code);
422
            put_bits(&s->pb, 4, s->f_code);
423
        }else{
424
            put_bits(&s->pb, 8, 255);
425
        }
426
        if (s->pict_type == B_TYPE) {
427
            put_bits(&s->pb, 4, s->b_code);
428
            put_bits(&s->pb, 4, s->b_code);
429
        }else{
430
            put_bits(&s->pb, 8, 255);
431
        }
432
        put_bits(&s->pb, 2, s->intra_dc_precision);
433
        
434
        assert(s->picture_structure == PICT_FRAME);
435
        put_bits(&s->pb, 2, s->picture_structure);
436
        if (s->progressive_sequence) {
437
            put_bits(&s->pb, 1, 0); /* no repeat */
438
        } else {
439
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
440
        }
441
        /* XXX: optimize the generation of this flag with entropy
442
           measures */
443
        s->frame_pred_frame_dct = s->progressive_sequence;
444
        
445
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
446
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
447
        put_bits(&s->pb, 1, s->q_scale_type);
448
        put_bits(&s->pb, 1, s->intra_vlc_format);
449
        put_bits(&s->pb, 1, s->alternate_scan);
450
        put_bits(&s->pb, 1, s->repeat_first_field);
451
        put_bits(&s->pb, 1, s->chroma_420_type=1);
452
        s->progressive_frame = s->progressive_sequence;
453
        put_bits(&s->pb, 1, s->progressive_frame);
454
        put_bits(&s->pb, 1, 0); //composite_display_flag
455
    }
456
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
457
        int i;
458

    
459
        put_header(s, USER_START_CODE);
460
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
461
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
462
        }
463
    }
464
    
465
    s->mb_y=0;
466
    ff_mpeg1_encode_slice_header(s);
467
}
468

    
469
static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
470
                                int has_mv, int field_motion)
471
{
472
    put_bits(&s->pb, n, bits);
473
    if (!s->frame_pred_frame_dct) {
474
        if (has_mv) 
475
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
476
        put_bits(&s->pb, 1, s->interlaced_dct);
477
    }
478
}
479

    
480
void mpeg1_encode_mb(MpegEncContext *s,
481
                     DCTELEM block[6][64],
482
                     int motion_x, int motion_y)
483
{
484
    int i, cbp;
485
    const int mb_x = s->mb_x;
486
    const int mb_y = s->mb_y;
487
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
488

    
489
    /* compute cbp */
490
    cbp = 0;
491
    for(i=0;i<6;i++) {
492
        if (s->block_last_index[i] >= 0)
493
            cbp |= 1 << (5 - i);
494
    }
495
    
496
    if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
497
        ((s->pict_type == P_TYPE && s->mv_type == MV_TYPE_16X16 && (motion_x | motion_y) == 0) ||
498
        (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) |
499
        ((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))) {
500
        s->mb_skip_run++;
501
        s->qscale -= s->dquant;
502
        s->skip_count++;
503
        s->misc_bits++;
504
        s->last_bits++;
505
        if(s->pict_type == P_TYPE){
506
            s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
507
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
508
        }
509
    } else {
510
        if(first_mb){
511
            assert(s->mb_skip_run == 0);
512
            encode_mb_skip_run(s, s->mb_x);
513
        }else{
514
            encode_mb_skip_run(s, s->mb_skip_run);
515
        }
516
        
517
        if (s->pict_type == I_TYPE) {
518
            if(s->dquant && cbp){
519
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
520
                put_bits(&s->pb, 5, s->qscale);
521
            }else{
522
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
523
                s->qscale -= s->dquant;
524
            }
525
            s->misc_bits+= get_bits_diff(s);
526
            s->i_count++;
527
        } else if (s->mb_intra) {
528
            if(s->dquant && cbp){
529
                put_mb_modes(s, 6, 0x01, 0, 0);
530
                put_bits(&s->pb, 5, s->qscale);
531
            }else{
532
                put_mb_modes(s, 5, 0x03, 0, 0);
533
                s->qscale -= s->dquant;
534
            }
535
            s->misc_bits+= get_bits_diff(s);
536
            s->i_count++;
537
            memset(s->last_mv, 0, sizeof(s->last_mv));
538
        } else if (s->pict_type == P_TYPE) { 
539
            if(s->mv_type == MV_TYPE_16X16){
540
                if (cbp != 0) {
541
                    if ((motion_x|motion_y) == 0) {
542
                        if(s->dquant){
543
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
544
                            put_bits(&s->pb, 5, s->qscale);
545
                        }else{
546
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
547
                        }
548
                        s->misc_bits+= get_bits_diff(s);
549
                    } else {
550
                        if(s->dquant){
551
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
552
                            put_bits(&s->pb, 5, s->qscale);
553
                        }else{
554
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
555
                        }
556
                        s->misc_bits+= get_bits_diff(s);
557
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
558
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
559
                        s->mv_bits+= get_bits_diff(s);
560
                    }
561
                } else {
562
                    put_bits(&s->pb, 3, 1); /* motion only */
563
                    if (!s->frame_pred_frame_dct)
564
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
565
                    s->misc_bits+= get_bits_diff(s);
566
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
567
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
568
                    s->qscale -= s->dquant;
569
                    s->mv_bits+= get_bits_diff(s);
570
                }
571
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
572
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
573
            }else{
574
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
575

    
576
                if (cbp) {
577
                    if(s->dquant){
578
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
579
                        put_bits(&s->pb, 5, s->qscale);
580
                    }else{
581
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
582
                    }
583
                } else {
584
                    put_bits(&s->pb, 3, 1); /* motion only */
585
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
586
                    s->qscale -= s->dquant;
587
                }
588
                s->misc_bits+= get_bits_diff(s);
589
                for(i=0; i<2; i++){
590
                    put_bits(&s->pb, 1, s->field_select[0][i]);
591
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
592
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
593
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
594
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
595
                }
596
                s->mv_bits+= get_bits_diff(s);
597
            }
598
            if(cbp)
599
                put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
600
            s->f_count++;
601
        } else{  
602
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
603

    
604
            if(s->mv_type == MV_TYPE_16X16){
605
                if (cbp){    // With coded bloc pattern
606
                    if (s->dquant) {
607
                        if(s->mv_dir == MV_DIR_FORWARD)
608
                            put_mb_modes(s, 6, 3, 1, 0);
609
                        else
610
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
611
                        put_bits(&s->pb, 5, s->qscale);
612
                    } else {
613
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
614
                    }
615
                }else{    // No coded bloc pattern
616
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
617
                    if (!s->frame_pred_frame_dct)
618
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
619
                    s->qscale -= s->dquant;
620
                }
621
                s->misc_bits += get_bits_diff(s);
622
                if (s->mv_dir&MV_DIR_FORWARD){
623
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
624
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
625
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
626
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
627
                    s->f_count++;
628
                }
629
                if (s->mv_dir&MV_DIR_BACKWARD){
630
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
631
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
632
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
633
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
634
                    s->b_count++;
635
                }
636
            }else{
637
                assert(s->mv_type == MV_TYPE_FIELD);
638
                assert(!s->frame_pred_frame_dct);
639
                if (cbp){    // With coded bloc pattern
640
                    if (s->dquant) {
641
                        if(s->mv_dir == MV_DIR_FORWARD)
642
                            put_mb_modes(s, 6, 3, 1, 1);
643
                        else
644
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
645
                        put_bits(&s->pb, 5, s->qscale);
646
                    } else {
647
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
648
                    }
649
                }else{    // No coded bloc pattern
650
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
651
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
652
                    s->qscale -= s->dquant;
653
                }
654
                s->misc_bits += get_bits_diff(s);
655
                if (s->mv_dir&MV_DIR_FORWARD){
656
                    for(i=0; i<2; i++){
657
                        put_bits(&s->pb, 1, s->field_select[0][i]);
658
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
659
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
660
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
661
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
662
                    }
663
                    s->f_count++;
664
                }
665
                if (s->mv_dir&MV_DIR_BACKWARD){
666
                    for(i=0; i<2; i++){
667
                        put_bits(&s->pb, 1, s->field_select[1][i]);
668
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
669
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
670
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
671
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
672
                    }
673
                    s->b_count++;
674
                }
675
            }
676
            s->mv_bits += get_bits_diff(s);
677
            if(cbp)
678
                put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
679
        }
680
        for(i=0;i<6;i++) {
681
            if (cbp & (1 << (5 - i))) {
682
                mpeg1_encode_block(s, block[i], i);
683
            }
684
        }
685
        s->mb_skip_run = 0;
686
        if(s->mb_intra)
687
            s->i_tex_bits+= get_bits_diff(s);
688
        else
689
            s->p_tex_bits+= get_bits_diff(s);
690
    }
691
}
692

    
693
// RAL: Parameter added: f_or_b_code
694
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
695
{
696
    int code, bit_size, l, m, bits, range, sign;
697

    
698
    if (val == 0) {
699
        /* zero vector */
700
        code = 0;
701
        put_bits(&s->pb,
702
                 mbMotionVectorTable[0][1], 
703
                 mbMotionVectorTable[0][0]); 
704
    } else {
705
        bit_size = f_or_b_code - 1;
706
        range = 1 << bit_size;
707
        /* modulo encoding */
708
        l = 16 * range;
709
        m = 2 * l;
710
        if (val < -l) {
711
            val += m;
712
        } else if (val >= l) {
713
            val -= m;
714
        }
715

    
716
        if (val >= 0) {
717
            val--;
718
            code = (val >> bit_size) + 1;
719
            bits = val & (range - 1);
720
            sign = 0;
721
        } else {
722
            val = -val;
723
            val--;
724
            code = (val >> bit_size) + 1;
725
            bits = val & (range - 1);
726
            sign = 1;
727
        }
728

    
729
        assert(code > 0 && code <= 16);
730

    
731
        put_bits(&s->pb,
732
                 mbMotionVectorTable[code][1], 
733
                 mbMotionVectorTable[code][0]); 
734

    
735
        put_bits(&s->pb, 1, sign);
736
        if (bit_size > 0) {
737
            put_bits(&s->pb, bit_size, bits);
738
        }
739
    }
740
}
741

    
742
void ff_mpeg1_encode_init(MpegEncContext *s)
743
{
744
    static int done=0;
745

    
746
    common_init(s);
747

    
748
    if(!done){
749
        int f_code;
750
        int mv;
751
        int i;
752

    
753
        done=1;
754
        init_rl(&rl_mpeg1);
755

    
756
        for(i=0; i<64; i++)
757
        {
758
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
759
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
760
        }
761
        
762
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
763

    
764
        /* build unified dc encoding tables */
765
        for(i=-255; i<256; i++)
766
        {
767
                int adiff, index;
768
                int bits, code;
769
                int diff=i;
770

    
771
                adiff = ABS(diff);
772
                if(diff<0) diff--;
773
                index = vlc_dc_table[adiff];
774

    
775
                bits= vlc_dc_lum_bits[index] + index;
776
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
777
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
778
                
779
                bits= vlc_dc_chroma_bits[index] + index;
780
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
781
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
782
        }
783

    
784
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
785

    
786
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
787
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
788
                int len;
789

    
790
                if(mv==0) len= mbMotionVectorTable[0][1];
791
                else{
792
                    int val, bit_size, range, code;
793

    
794
                    bit_size = s->f_code - 1;
795
                    range = 1 << bit_size;
796

    
797
                    val=mv;
798
                    if (val < 0) 
799
                        val = -val;
800
                    val--;
801
                    code = (val >> bit_size) + 1;
802
                    if(code<17){
803
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
804
                    }else{
805
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
806
                    }
807
                }
808

    
809
                mv_penalty[f_code][mv+MAX_MV]= len;
810
            }
811
        }
812
        
813

    
814
        for(f_code=MAX_FCODE; f_code>0; f_code--){
815
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
816
                fcode_tab[mv+MAX_MV]= f_code;
817
            }
818
        }
819
    }
820
    s->me.mv_penalty= mv_penalty;
821
    s->fcode_tab= fcode_tab;
822
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
823
        s->min_qcoeff=-255;
824
        s->max_qcoeff= 255;
825
    }else{
826
        s->min_qcoeff=-2047;
827
        s->max_qcoeff= 2047;
828
    }
829
    s->intra_ac_vlc_length=
830
    s->inter_ac_vlc_length=
831
    s->intra_ac_vlc_last_length=
832
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
833
}
834

    
835
static inline void encode_dc(MpegEncContext *s, int diff, int component)
836
{
837
    if (component == 0) {
838
        put_bits(
839
            &s->pb, 
840
            mpeg1_lum_dc_uni[diff+255]&0xFF,
841
            mpeg1_lum_dc_uni[diff+255]>>8);
842
    } else {
843
        put_bits(
844
            &s->pb, 
845
            mpeg1_chr_dc_uni[diff+255]&0xFF,
846
            mpeg1_chr_dc_uni[diff+255]>>8);
847
    }
848
}
849

    
850
static void mpeg1_encode_block(MpegEncContext *s, 
851
                               DCTELEM *block, 
852
                               int n)
853
{
854
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
855
    int code, component;
856
//    RLTable *rl = &rl_mpeg1;
857

    
858
    last_index = s->block_last_index[n];
859

    
860
    /* DC coef */
861
    if (s->mb_intra) {
862
        component = (n <= 3 ? 0 : n - 4 + 1);
863
        dc = block[0]; /* overflow is impossible */
864
        diff = dc - s->last_dc[component];
865
        encode_dc(s, diff, component);
866
        s->last_dc[component] = dc;
867
        i = 1;
868
/*
869
        if (s->intra_vlc_format)
870
            rl = &rl_mpeg2;
871
        else
872
            rl = &rl_mpeg1;
873
*/
874
    } else {
875
        /* encode the first coefficient : needs to be done here because
876
           it is handled slightly differently */
877
        level = block[0];
878
        if (abs(level) == 1) {
879
                code = ((uint32_t)level >> 31); /* the sign bit */
880
                put_bits(&s->pb, 2, code | 0x02);
881
                i = 1;
882
        } else {
883
            i = 0;
884
            last_non_zero = -1;
885
            goto next_coef;
886
        }
887
    }
888

    
889
    /* now quantify & encode AC coefs */
890
    last_non_zero = i - 1;
891

    
892
    for(;i<=last_index;i++) {
893
        j = s->intra_scantable.permutated[i];
894
        level = block[j];
895
    next_coef:
896
#if 0
897
        if (level != 0)
898
            dprintf("level[%d]=%d\n", i, level);
899
#endif            
900
        /* encode using VLC */
901
        if (level != 0) {
902
            run = i - last_non_zero - 1;
903
            
904
            alevel= level;
905
            MASK_ABS(sign, alevel)
906
            sign&=1;
907

    
908
//            code = get_rl_index(rl, 0, run, alevel);
909
            if (alevel <= mpeg1_max_level[0][run]){
910
                code= mpeg1_index_run[0][run] + alevel - 1;
911
                    /* store the vlc & sign at once */
912
                put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
913
            } else {
914
                /* escape seems to be pretty rare <5% so i dont optimize it */
915
                put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
916
                /* escape: only clip in this case */
917
                put_bits(&s->pb, 6, run);
918
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
919
                    if (alevel < 128) {
920
                        put_bits(&s->pb, 8, level & 0xff);
921
                    } else {
922
                        if (level < 0) {
923
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
924
                        } else {
925
                            put_bits(&s->pb, 16, level & 0xffff);
926
                        }
927
                    }
928
                }else{
929
                    put_bits(&s->pb, 12, level & 0xfff);
930
                }
931
            }
932
            last_non_zero = i;
933
        }
934
    }
935
    /* end of block */
936
    put_bits(&s->pb, 2, 0x2);
937
}
938
#endif //CONFIG_ENCODERS
939

    
940
/******************************************/
941
/* decoding */
942

    
943
static VLC dc_lum_vlc;
944
static VLC dc_chroma_vlc;
945
static VLC mv_vlc;
946
static VLC mbincr_vlc;
947
static VLC mb_ptype_vlc;
948
static VLC mb_btype_vlc;
949
static VLC mb_pat_vlc;
950

    
951
static void init_vlcs()
952
{
953
    static int done = 0;
954

    
955
    if (!done) {
956
        done = 1;
957

    
958
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
959
                 vlc_dc_lum_bits, 1, 1,
960
                 vlc_dc_lum_code, 2, 2);
961
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
962
                 vlc_dc_chroma_bits, 1, 1,
963
                 vlc_dc_chroma_code, 2, 2);
964
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
965
                 &mbMotionVectorTable[0][1], 2, 1,
966
                 &mbMotionVectorTable[0][0], 2, 1);
967
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
968
                 &mbAddrIncrTable[0][1], 2, 1,
969
                 &mbAddrIncrTable[0][0], 2, 1);
970
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63, 
971
                 &mbPatTable[0][1], 2, 1,
972
                 &mbPatTable[0][0], 2, 1);
973
        
974
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
975
                 &table_mb_ptype[0][1], 2, 1,
976
                 &table_mb_ptype[0][0], 2, 1);
977
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
978
                 &table_mb_btype[0][1], 2, 1,
979
                 &table_mb_btype[0][0], 2, 1);
980
        init_rl(&rl_mpeg1);
981
        init_rl(&rl_mpeg2);
982

    
983
        init_2d_vlc_rl(&rl_mpeg1);
984
        init_2d_vlc_rl(&rl_mpeg2);
985
    }
986
}
987

    
988
static inline int get_dmv(MpegEncContext *s)
989
{
990
    if(get_bits1(&s->gb)) 
991
        return 1 - (get_bits1(&s->gb) << 1);
992
    else
993
        return 0;
994
}
995

    
996
static inline int get_qscale(MpegEncContext *s)
997
{
998
    int qscale = get_bits(&s->gb, 5);
999
    if (s->q_scale_type) {
1000
        return non_linear_qscale[qscale];
1001
    } else {
1002
        return qscale << 1;
1003
    }
1004
}
1005

    
1006
/* motion type (for mpeg2) */
1007
#define MT_FIELD 1
1008
#define MT_FRAME 2
1009
#define MT_16X8  2
1010
#define MT_DMV   3
1011

    
1012
static int mpeg_decode_mb(MpegEncContext *s,
1013
                          DCTELEM block[12][64])
1014
{
1015
    int i, j, k, cbp, val, mb_type, motion_type;
1016
    
1017
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1018

    
1019
    assert(s->mb_skiped==0);
1020

    
1021
    if (s->mb_skip_run-- != 0) {
1022
        if(s->pict_type == I_TYPE){
1023
            av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1024
            return -1;
1025
        }
1026
    
1027
        /* skip mb */
1028
        s->mb_intra = 0;
1029
        for(i=0;i<12;i++)
1030
            s->block_last_index[i] = -1;
1031
        if(s->picture_structure == PICT_FRAME)
1032
            s->mv_type = MV_TYPE_16X16;
1033
        else
1034
            s->mv_type = MV_TYPE_FIELD;
1035
        if (s->pict_type == P_TYPE) {
1036
            /* if P type, zero motion vector is implied */
1037
            s->mv_dir = MV_DIR_FORWARD;
1038
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1039
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1040
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1041
            s->field_select[0][0]= s->picture_structure - 1;
1042
            s->mb_skiped = 1;
1043
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1044
        } else {
1045
            /* if B type, reuse previous vectors and directions */
1046
            s->mv[0][0][0] = s->last_mv[0][0][0];
1047
            s->mv[0][0][1] = s->last_mv[0][0][1];
1048
            s->mv[1][0][0] = s->last_mv[1][0][0];
1049
            s->mv[1][0][1] = s->last_mv[1][0][1];
1050

    
1051
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1052
                s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1053
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1054

    
1055
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1056
                s->mb_skiped = 1;
1057
        }
1058

    
1059
        return 0;
1060
    }
1061

    
1062
    switch(s->pict_type) {
1063
    default:
1064
    case I_TYPE:
1065
        if (get_bits1(&s->gb) == 0) {
1066
            if (get_bits1(&s->gb) == 0){
1067
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1068
                return -1;
1069
            }
1070
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1071
        } else {
1072
            mb_type = MB_TYPE_INTRA;
1073
        }
1074
        break;
1075
    case P_TYPE:
1076
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1077
        if (mb_type < 0){
1078
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1079
            return -1;
1080
        }
1081
        mb_type = ptype2mb_type[ mb_type ];
1082
        break;
1083
    case B_TYPE:
1084
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1085
        if (mb_type < 0){
1086
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1087
            return -1;
1088
        }
1089
        mb_type = btype2mb_type[ mb_type ];
1090
        break;
1091
    }
1092
    dprintf("mb_type=%x\n", mb_type);
1093
//    motion_type = 0; /* avoid warning */
1094
    if (IS_INTRA(mb_type)) {
1095
        /* compute dct type */
1096
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1097
            !s->frame_pred_frame_dct) {
1098
            s->interlaced_dct = get_bits1(&s->gb);
1099
        }
1100

    
1101
        if (IS_QUANT(mb_type))
1102
            s->qscale = get_qscale(s);
1103
        
1104
        if (s->concealment_motion_vectors) {
1105
            /* just parse them */
1106
            if (s->picture_structure != PICT_FRAME) 
1107
                skip_bits1(&s->gb); /* field select */
1108
            
1109
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1110
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1111
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1112
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1113

    
1114
            skip_bits1(&s->gb); /* marker */
1115
        }else
1116
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1117
        s->mb_intra = 1;
1118
#ifdef HAVE_XVMC
1119
        //one 1 we memcpy blocks in xvmcvideo
1120
        if(s->avctx->xvmc_acceleration > 1){
1121
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1122
            if(s->swap_uv){
1123
                exchange_uv(s);
1124
            }
1125
        }
1126
#endif
1127

    
1128
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1129
            for(i=0;i<4+(1<<s->chroma_format);i++) {
1130
                if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1131
                    return -1;
1132
            }
1133
        } else {
1134
            for(i=0;i<6;i++) {
1135
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1136
                    return -1;
1137
            }
1138
        }
1139
    } else {
1140
        if (mb_type & MB_TYPE_ZERO_MV){
1141
            assert(mb_type & MB_TYPE_CBP);
1142

    
1143
            /* compute dct type */
1144
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1145
                !s->frame_pred_frame_dct) {
1146
                s->interlaced_dct = get_bits1(&s->gb);
1147
            }
1148

    
1149
            if (IS_QUANT(mb_type))
1150
                s->qscale = get_qscale(s);
1151

    
1152
            s->mv_dir = MV_DIR_FORWARD;
1153
            if(s->picture_structure == PICT_FRAME)
1154
                s->mv_type = MV_TYPE_16X16;
1155
            else{
1156
                s->mv_type = MV_TYPE_FIELD;
1157
                mb_type |= MB_TYPE_INTERLACED;
1158
                s->field_select[0][0]= s->picture_structure - 1;
1159
            }
1160
            s->last_mv[0][0][0] = 0;
1161
            s->last_mv[0][0][1] = 0;
1162
            s->last_mv[0][1][0] = 0;
1163
            s->last_mv[0][1][1] = 0;
1164
            s->mv[0][0][0] = 0;
1165
            s->mv[0][0][1] = 0;
1166
        }else{
1167
            assert(mb_type & MB_TYPE_L0L1);
1168
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1169
            /* get additionnal motion vector type */
1170
            if (s->frame_pred_frame_dct) 
1171
                motion_type = MT_FRAME;
1172
            else{
1173
                motion_type = get_bits(&s->gb, 2);
1174
            }
1175

    
1176
            /* compute dct type */
1177
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1178
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1179
                s->interlaced_dct = get_bits1(&s->gb);
1180
            }
1181

    
1182
            if (IS_QUANT(mb_type))
1183
                s->qscale = get_qscale(s);
1184

    
1185
            /* motion vectors */
1186
            s->mv_dir = 0;
1187
            for(i=0;i<2;i++) {
1188
                if (USES_LIST(mb_type, i)) {
1189
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1190
                    dprintf("motion_type=%d\n", motion_type);
1191
                    switch(motion_type) {
1192
                    case MT_FRAME: /* or MT_16X8 */
1193
                        if (s->picture_structure == PICT_FRAME) {
1194
                            /* MT_FRAME */
1195
                            mb_type |= MB_TYPE_16x16; 
1196
                            s->mv_type = MV_TYPE_16X16;
1197
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1198
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1199
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1200
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1201
                            /* full_pel: only for mpeg1 */
1202
                            if (s->full_pel[i]){
1203
                                s->mv[i][0][0] <<= 1;
1204
                                s->mv[i][0][1] <<= 1;
1205
                            }
1206
                        } else {
1207
                            /* MT_16X8 */
1208
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1209
                            s->mv_type = MV_TYPE_16X8;
1210
                            for(j=0;j<2;j++) {
1211
                                s->field_select[i][j] = get_bits1(&s->gb);
1212
                                for(k=0;k<2;k++) {
1213
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1214
                                                             s->last_mv[i][j][k]);
1215
                                    s->last_mv[i][j][k] = val;
1216
                                    s->mv[i][j][k] = val;
1217
                                }
1218
                            }
1219
                        }
1220
                        break;
1221
                    case MT_FIELD:
1222
                        s->mv_type = MV_TYPE_FIELD;
1223
                        if (s->picture_structure == PICT_FRAME) {
1224
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1225
                            for(j=0;j<2;j++) {
1226
                                s->field_select[i][j] = get_bits1(&s->gb);
1227
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1228
                                                         s->last_mv[i][j][0]);
1229
                                s->last_mv[i][j][0] = val;
1230
                                s->mv[i][j][0] = val;
1231
                                dprintf("fmx=%d\n", val);
1232
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1233
                                                         s->last_mv[i][j][1] >> 1);
1234
                                s->last_mv[i][j][1] = val << 1;
1235
                                s->mv[i][j][1] = val;
1236
                                dprintf("fmy=%d\n", val);
1237
                            }
1238
                        } else {
1239
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1240
                            s->field_select[i][0] = get_bits1(&s->gb);
1241
                            for(k=0;k<2;k++) {
1242
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1243
                                                         s->last_mv[i][0][k]);
1244
                                s->last_mv[i][0][k] = val;
1245
                                s->last_mv[i][1][k] = val;
1246
                                s->mv[i][0][k] = val;
1247
                            }
1248
                        }
1249
                        break;
1250
                    case MT_DMV:
1251
                        {
1252
                            int dmx, dmy, mx, my, m;
1253

    
1254
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1255
                                                    s->last_mv[i][0][0]);
1256
                            s->last_mv[i][0][0] = mx;
1257
                            s->last_mv[i][1][0] = mx;
1258
                            dmx = get_dmv(s);
1259
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1260
                                                    s->last_mv[i][0][1] >> 1);
1261
                            dmy = get_dmv(s);
1262
                            s->mv_type = MV_TYPE_DMV;
1263

    
1264

    
1265
                            s->last_mv[i][0][1] = my<<1;
1266
                            s->last_mv[i][1][1] = my<<1;
1267

    
1268
                            s->mv[i][0][0] = mx;
1269
                            s->mv[i][0][1] = my;
1270
                            s->mv[i][1][0] = mx;//not used
1271
                            s->mv[i][1][1] = my;//not used
1272

    
1273
                            if (s->picture_structure == PICT_FRAME) {
1274
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1275

    
1276
                                //m = 1 + 2 * s->top_field_first;
1277
                                m = s->top_field_first ? 1 : 3;
1278

    
1279
                                /* top -> top pred */
1280
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1281
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1282
                                m = 4 - m;
1283
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1284
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1285
                            } else {
1286
                                mb_type |= MB_TYPE_16x16;
1287

    
1288
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1289
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1290
                                if(s->picture_structure == PICT_TOP_FIELD)
1291
                                    s->mv[i][2][1]--;
1292
                                else 
1293
                                    s->mv[i][2][1]++;
1294
                            }
1295
                        }
1296
                        break;
1297
                    default:
1298
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1299
                        return -1;
1300
                    }
1301
                }
1302
            }
1303
        }
1304
        
1305
        s->mb_intra = 0;
1306

    
1307
        if (HAS_CBP(mb_type)) {
1308
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1309
            if (cbp < 0){
1310
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1311
                return -1;
1312
            }
1313
            cbp++;
1314
            if(s->chroma_format == 2){//CHROMA422
1315
                 cbp|= ( get_bits(&s->gb,2) ) << 6;
1316
            }else
1317
            if(s->chroma_format >  2){//CHROMA444
1318
                 cbp|= ( get_bits(&s->gb,6) ) << 6;
1319
            }
1320

    
1321
#ifdef HAVE_XVMC
1322
            //on 1 we memcpy blocks in xvmcvideo
1323
            if(s->avctx->xvmc_acceleration > 1){
1324
                XVMC_pack_pblocks(s,cbp);
1325
                if(s->swap_uv){
1326
                    exchange_uv(s);
1327
                }
1328
            }    
1329
#endif
1330

    
1331
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1332
                for(i=0;i<6;i++) {
1333
                    if (cbp & (1<<(5-i)) ) {
1334
                        if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1335
                            return -1;
1336
                    } else {
1337
                        s->block_last_index[i] = -1;
1338
                    }
1339
                }
1340
                if (s->chroma_format >= 2) {
1341
                    if (s->chroma_format == 2) {//CHROMA_422)
1342
                        for(i=6;i<8;i++) {
1343
                            if (cbp & (1<<(6+7-i)) ) {
1344
                                if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1345
                                    return -1;
1346
                            } else {
1347
                                s->block_last_index[i] = -1;
1348
                            }
1349
                        }
1350
                    }else{ /*CHROMA_444*/
1351
                        for(i=6;i<12;i++) {
1352
                            if (cbp & (1<<(6+11-i)) ) {
1353
                                if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1354
                                    return -1;
1355
                            } else {
1356
                                s->block_last_index[i] = -1;
1357
                            }
1358
                        }
1359
                    }
1360
                }
1361
            } else {
1362
                for(i=0;i<6;i++) {
1363
                    if (cbp & 32) {
1364
                        if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1365
                            return -1;
1366
                    } else {
1367
                        s->block_last_index[i] = -1;
1368
                    }
1369
                    cbp+=cbp;
1370
                }
1371
            }
1372
        }else{
1373
            for(i=0;i<6;i++)
1374
                s->block_last_index[i] = -1;
1375
        }
1376
    }
1377

    
1378
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1379

    
1380
    return 0;
1381
}
1382

    
1383
/* as h263, but only 17 codes */
1384
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1385
{
1386
    int code, sign, val, l, shift;
1387

    
1388
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1389
    if (code == 0) {
1390
        return pred;
1391
    }
1392
    if (code < 0) {
1393
        return 0xffff;
1394
    }
1395

    
1396
    sign = get_bits1(&s->gb);
1397
    shift = fcode - 1;
1398
    val = code;
1399
    if (shift) {
1400
        val = (val - 1) << shift;
1401
        val |= get_bits(&s->gb, shift);
1402
        val++;
1403
    }
1404
    if (sign)
1405
        val = -val;
1406
    val += pred;
1407
    
1408
    /* modulo decoding */
1409
    l = 1 << (shift+4);
1410
    val = ((val + l)&(l*2-1)) - l;
1411
    return val;
1412
}
1413

    
1414
static inline int decode_dc(GetBitContext *gb, int component)
1415
{
1416
    int code, diff;
1417

    
1418
    if (component == 0) {
1419
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1420
    } else {
1421
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1422
    }
1423
    if (code < 0){
1424
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1425
        return 0xffff;
1426
    }
1427
    if (code == 0) {
1428
        diff = 0;
1429
    } else {
1430
        diff = get_xbits(gb, code);
1431
    }
1432
    return diff;
1433
}
1434

    
1435
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1436
                               DCTELEM *block, 
1437
                               int n)
1438
{
1439
    int level, dc, diff, i, j, run;
1440
    int component;
1441
    RLTable *rl = &rl_mpeg1;
1442
    uint8_t * const scantable= s->intra_scantable.permutated;
1443
    const uint16_t *quant_matrix= s->intra_matrix;
1444
    const int qscale= s->qscale;
1445

    
1446
    /* DC coef */
1447
    component = (n <= 3 ? 0 : n - 4 + 1);
1448
    diff = decode_dc(&s->gb, component);
1449
    if (diff >= 0xffff)
1450
        return -1;
1451
    dc = s->last_dc[component];
1452
    dc += diff;
1453
    s->last_dc[component] = dc;
1454
    block[0] = dc<<3;
1455
    dprintf("dc=%d diff=%d\n", dc, diff);
1456
    i = 0;
1457
    {
1458
        OPEN_READER(re, &s->gb);    
1459
        /* now quantify & encode AC coefs */
1460
        for(;;) {
1461
            UPDATE_CACHE(re, &s->gb);
1462
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1463
            
1464
            if(level == 127){
1465
                break;
1466
            } else if(level != 0) {
1467
                i += run;
1468
                j = scantable[i];
1469
                level= (level*qscale*quant_matrix[j])>>4;
1470
                level= (level-1)|1;
1471
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1472
                LAST_SKIP_BITS(re, &s->gb, 1);
1473
            } else {
1474
                /* escape */
1475
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1476
                UPDATE_CACHE(re, &s->gb);
1477
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1478
                if (level == -128) {
1479
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1480
                } else if (level == 0) {
1481
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1482
                }
1483
                i += run;
1484
                j = scantable[i];
1485
                if(level<0){
1486
                    level= -level;
1487
                    level= (level*qscale*quant_matrix[j])>>4;
1488
                    level= (level-1)|1;
1489
                    level= -level;
1490
                }else{
1491
                    level= (level*qscale*quant_matrix[j])>>4;
1492
                    level= (level-1)|1;
1493
                }
1494
            }
1495
            if (i > 63){
1496
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1497
                return -1;
1498
            }
1499

    
1500
            block[j] = level;
1501
        }
1502
        CLOSE_READER(re, &s->gb);
1503
    }
1504
    s->block_last_index[n] = i;
1505
   return 0;
1506
}
1507

    
1508
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1509
                               DCTELEM *block, 
1510
                               int n)
1511
{
1512
    int level, i, j, run;
1513
    RLTable *rl = &rl_mpeg1;
1514
    uint8_t * const scantable= s->intra_scantable.permutated;
1515
    const uint16_t *quant_matrix= s->inter_matrix;
1516
    const int qscale= s->qscale;
1517

    
1518
    {
1519
        int v;
1520
        OPEN_READER(re, &s->gb);
1521
        i = -1;
1522
        /* special case for the first coef. no need to add a second vlc table */
1523
        UPDATE_CACHE(re, &s->gb);
1524
        v= SHOW_UBITS(re, &s->gb, 2);
1525
        if (v & 2) {
1526
            LAST_SKIP_BITS(re, &s->gb, 2);
1527
            level= (3*qscale*quant_matrix[0])>>5;
1528
            level= (level-1)|1;
1529
            if(v&1)
1530
                level= -level;
1531
            block[0] = level;
1532
            i++;
1533
        }
1534

    
1535
        /* now quantify & encode AC coefs */
1536
        for(;;) {
1537
            UPDATE_CACHE(re, &s->gb);
1538
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1539
            
1540
            if(level == 127){
1541
                break;
1542
            } else if(level != 0) {
1543
                i += run;
1544
                j = scantable[i];
1545
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1546
                level= (level-1)|1;
1547
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1548
                LAST_SKIP_BITS(re, &s->gb, 1);
1549
            } else {
1550
                /* escape */
1551
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1552
                UPDATE_CACHE(re, &s->gb);
1553
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1554
                if (level == -128) {
1555
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1556
                } else if (level == 0) {
1557
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1558
                }
1559
                i += run;
1560
                j = scantable[i];
1561
                if(level<0){
1562
                    level= -level;
1563
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1564
                    level= (level-1)|1;
1565
                    level= -level;
1566
                }else{
1567
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1568
                    level= (level-1)|1;
1569
                }
1570
            }
1571
            if (i > 63){
1572
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1573
                return -1;
1574
            }
1575

    
1576
            block[j] = level;
1577
        }
1578
        CLOSE_READER(re, &s->gb);
1579
    }
1580
    s->block_last_index[n] = i;
1581
    return 0;
1582
}
1583

    
1584
/* Also does unquantization here, since I will never support mpeg2
1585
   encoding */
1586
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1587
                               DCTELEM *block, 
1588
                               int n)
1589
{
1590
    int level, i, j, run;
1591
    RLTable *rl = &rl_mpeg1;
1592
    uint8_t * const scantable= s->intra_scantable.permutated;
1593
    const uint16_t *quant_matrix;
1594
    const int qscale= s->qscale;
1595
    int mismatch;
1596

    
1597
    mismatch = 1;
1598

    
1599
    {
1600
        int v;
1601
        OPEN_READER(re, &s->gb);
1602
        i = -1;
1603
        if (n < 4)
1604
            quant_matrix = s->inter_matrix;
1605
        else
1606
            quant_matrix = s->chroma_inter_matrix;
1607

    
1608
        /* special case for the first coef. no need to add a second vlc table */
1609
        UPDATE_CACHE(re, &s->gb);
1610
        v= SHOW_UBITS(re, &s->gb, 2);
1611
        if (v & 2) {
1612
            LAST_SKIP_BITS(re, &s->gb, 2);
1613
            level= (3*qscale*quant_matrix[0])>>5;
1614
            if(v&1)
1615
                level= -level;
1616
            block[0] = level;
1617
            mismatch ^= level;
1618
            i++;
1619
        }
1620

    
1621
        /* now quantify & encode AC coefs */
1622
        for(;;) {
1623
            UPDATE_CACHE(re, &s->gb);
1624
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1625
            
1626
            if(level == 127){
1627
                break;
1628
            } else if(level != 0) {
1629
                i += run;
1630
                j = scantable[i];
1631
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1632
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1633
                LAST_SKIP_BITS(re, &s->gb, 1);
1634
            } else {
1635
                /* escape */
1636
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1637
                UPDATE_CACHE(re, &s->gb);
1638
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1639

    
1640
                i += run;
1641
                j = scantable[i];
1642
                if(level<0){
1643
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1644
                    level= -level;
1645
                }else{
1646
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1647
                }
1648
            }
1649
            if (i > 63){
1650
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1651
                return -1;
1652
            }
1653
            
1654
            mismatch ^= level;
1655
            block[j] = level;
1656
        }
1657
        CLOSE_READER(re, &s->gb);
1658
    }
1659
    block[63] ^= (mismatch & 1);
1660
    
1661
    s->block_last_index[n] = i;
1662
    return 0;
1663
}
1664

    
1665
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1666
                               DCTELEM *block, 
1667
                               int n)
1668
{
1669
    int level, dc, diff, i, j, run;
1670
    int component;
1671
    RLTable *rl;
1672
    uint8_t * const scantable= s->intra_scantable.permutated;
1673
    const uint16_t *quant_matrix;
1674
    const int qscale= s->qscale;
1675
    int mismatch;
1676

    
1677
    /* DC coef */
1678
    if (n < 4){
1679
        quant_matrix = s->intra_matrix;
1680
        component = 0; 
1681
    }else{
1682
        quant_matrix = s->chroma_intra_matrix;
1683
        component = (n&1) + 1;
1684
    }
1685
    diff = decode_dc(&s->gb, component);
1686
    if (diff >= 0xffff)
1687
        return -1;
1688
    dc = s->last_dc[component];
1689
    dc += diff;
1690
    s->last_dc[component] = dc;
1691
    block[0] = dc << (3 - s->intra_dc_precision);
1692
    dprintf("dc=%d\n", block[0]);
1693
    mismatch = block[0] ^ 1;
1694
    i = 0;
1695
    if (s->intra_vlc_format)
1696
        rl = &rl_mpeg2;
1697
    else
1698
        rl = &rl_mpeg1;
1699

    
1700
    {
1701
        OPEN_READER(re, &s->gb);    
1702
        /* now quantify & encode AC coefs */
1703
        for(;;) {
1704
            UPDATE_CACHE(re, &s->gb);
1705
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1706
            
1707
            if(level == 127){
1708
                break;
1709
            } else if(level != 0) {
1710
                i += run;
1711
                j = scantable[i];
1712
                level= (level*qscale*quant_matrix[j])>>4;
1713
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1714
                LAST_SKIP_BITS(re, &s->gb, 1);
1715
            } else {
1716
                /* escape */
1717
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1718
                UPDATE_CACHE(re, &s->gb);
1719
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1720
                i += run;
1721
                j = scantable[i];
1722
                if(level<0){
1723
                    level= (-level*qscale*quant_matrix[j])>>4;
1724
                    level= -level;
1725
                }else{
1726
                    level= (level*qscale*quant_matrix[j])>>4;
1727
                }
1728
            }
1729
            if (i > 63){
1730
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1731
                return -1;
1732
            }
1733
            
1734
            mismatch^= level;
1735
            block[j] = level;
1736
        }
1737
        CLOSE_READER(re, &s->gb);
1738
    }
1739
    block[63]^= mismatch&1;
1740
    
1741
    s->block_last_index[n] = i;
1742
    return 0;
1743
}
1744

    
1745
typedef struct Mpeg1Context {
1746
    MpegEncContext mpeg_enc_ctx;
1747
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1748
    int repeat_field; /* true if we must repeat the field */
1749
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1750
    int slice_count;
1751
} Mpeg1Context;
1752

    
1753
static int mpeg_decode_init(AVCodecContext *avctx)
1754
{
1755
    Mpeg1Context *s = avctx->priv_data;
1756
    
1757
    s->mpeg_enc_ctx.avctx= avctx;
1758
    s->mpeg_enc_ctx.flags= avctx->flags;
1759
    s->mpeg_enc_ctx.flags2= avctx->flags2;
1760
    common_init(&s->mpeg_enc_ctx);
1761
    init_vlcs();
1762

    
1763
    s->mpeg_enc_ctx_allocated = 0;
1764
    s->mpeg_enc_ctx.picture_number = 0;
1765
    s->repeat_field = 0;
1766
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1767
    return 0;
1768
}
1769

    
1770
/* return the 8 bit start code value and update the search
1771
   state. Return -1 if no start code found */
1772
static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1773
{
1774
    uint8_t *buf_ptr;
1775
    unsigned int state=0xFFFFFFFF, v;
1776
    int val;
1777

    
1778
    buf_ptr = *pbuf_ptr;
1779
    while (buf_ptr < buf_end) {
1780
        v = *buf_ptr++;
1781
        if (state == 0x000001) {
1782
            state = ((state << 8) | v) & 0xffffff;
1783
            val = state;
1784
            goto found;
1785
        }
1786
        state = ((state << 8) | v) & 0xffffff;
1787
    }
1788
    val = -1;
1789
 found:
1790
    *pbuf_ptr = buf_ptr;
1791
    return val;
1792
}
1793

    
1794
static int mpeg1_decode_picture(AVCodecContext *avctx, 
1795
                                uint8_t *buf, int buf_size)
1796
{
1797
    Mpeg1Context *s1 = avctx->priv_data;
1798
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1799
    int ref, f_code, vbv_delay;
1800

    
1801
    init_get_bits(&s->gb, buf, buf_size*8);
1802

    
1803
    ref = get_bits(&s->gb, 10); /* temporal ref */
1804
    s->pict_type = get_bits(&s->gb, 3);
1805

    
1806
    vbv_delay= get_bits(&s->gb, 16);
1807
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1808
        s->full_pel[0] = get_bits1(&s->gb);
1809
        f_code = get_bits(&s->gb, 3);
1810
        if (f_code == 0)
1811
            return -1;
1812
        s->mpeg_f_code[0][0] = f_code;
1813
        s->mpeg_f_code[0][1] = f_code;
1814
    }
1815
    if (s->pict_type == B_TYPE) {
1816
        s->full_pel[1] = get_bits1(&s->gb);
1817
        f_code = get_bits(&s->gb, 3);
1818
        if (f_code == 0)
1819
            return -1;
1820
        s->mpeg_f_code[1][0] = f_code;
1821
        s->mpeg_f_code[1][1] = f_code;
1822
    }
1823
    s->current_picture.pict_type= s->pict_type;
1824
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1825
    
1826
//    if(avctx->debug & FF_DEBUG_PICT_INFO)
1827
//        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
1828
    
1829
    s->y_dc_scale = 8;
1830
    s->c_dc_scale = 8;
1831
    s->first_slice = 1;
1832
    return 0;
1833
}
1834

    
1835
static void mpeg_decode_sequence_extension(MpegEncContext *s)
1836
{
1837
    int horiz_size_ext, vert_size_ext;
1838
    int bit_rate_ext;
1839
    int frame_rate_ext_n, frame_rate_ext_d;
1840
    int level, profile;
1841

    
1842
    skip_bits(&s->gb, 1); /* profil and level esc*/
1843
    profile= get_bits(&s->gb, 3);
1844
    level= get_bits(&s->gb, 4);
1845
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1846
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1847
    horiz_size_ext = get_bits(&s->gb, 2);
1848
    vert_size_ext = get_bits(&s->gb, 2);
1849
    s->width |= (horiz_size_ext << 12);
1850
    s->height |= (vert_size_ext << 12);
1851
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1852
    s->bit_rate += (bit_rate_ext << 12) * 400;
1853
    skip_bits1(&s->gb); /* marker */
1854
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1855

    
1856
    s->low_delay = get_bits1(&s->gb);
1857
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1858

    
1859
    frame_rate_ext_n = get_bits(&s->gb, 2);
1860
    frame_rate_ext_d = get_bits(&s->gb, 5);
1861
    av_reduce(
1862
        &s->avctx->frame_rate, 
1863
        &s->avctx->frame_rate_base, 
1864
        frame_rate_tab[s->frame_rate_index].num * (frame_rate_ext_n+1),
1865
        frame_rate_tab[s->frame_rate_index].den * (frame_rate_ext_d+1),
1866
        1<<30);
1867

    
1868
    dprintf("sequence extension\n");
1869
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1870
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1871

    
1872
    if(s->aspect_ratio_info <= 1)
1873
        s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
1874
    else{
1875
        s->avctx->sample_aspect_ratio= 
1876
            av_div_q(
1877
                mpeg2_aspect[s->aspect_ratio_info], 
1878
                (AVRational){s->width, s->height}
1879
            );
1880
    }
1881
    
1882
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1883
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
1884
               profile, level, s->avctx->rc_buffer_size, s->bit_rate);
1885
}
1886

    
1887
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1888
{
1889
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1890
    int color_description, w, h;
1891

    
1892
    skip_bits(&s->gb, 3); /* video format */
1893
    color_description= get_bits1(&s->gb);
1894
    if(color_description){
1895
        skip_bits(&s->gb, 8); /* color primaries */
1896
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1897
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1898
    }
1899
    w= get_bits(&s->gb, 14);
1900
    skip_bits(&s->gb, 1); //marker
1901
    h= get_bits(&s->gb, 14);
1902
    skip_bits(&s->gb, 1); //marker
1903
    
1904
    s1->pan_scan.width= 16*w;
1905
    s1->pan_scan.height=16*h;
1906

    
1907
    if(s->aspect_ratio_info > 1)
1908
        s->avctx->sample_aspect_ratio= 
1909
            av_div_q(
1910
                mpeg2_aspect[s->aspect_ratio_info], 
1911
                (AVRational){w, h}
1912
            );
1913
    
1914
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1915
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1916
}
1917

    
1918
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1919
{
1920
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1921
    int i;
1922

    
1923
    for(i=0; i<1; i++){ //FIXME count
1924
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1925
        skip_bits(&s->gb, 1); //marker
1926
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1927
        skip_bits(&s->gb, 1); //marker
1928
    }
1929
   
1930
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1931
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
1932
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
1933
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
1934
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1935
        );
1936
}
1937

    
1938
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1939
{
1940
    int i, v, j;
1941

    
1942
    dprintf("matrix extension\n");
1943

    
1944
    if (get_bits1(&s->gb)) {
1945
        for(i=0;i<64;i++) {
1946
            v = get_bits(&s->gb, 8);
1947
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1948
            s->intra_matrix[j] = v;
1949
            s->chroma_intra_matrix[j] = v;
1950
        }
1951
    }
1952
    if (get_bits1(&s->gb)) {
1953
        for(i=0;i<64;i++) {
1954
            v = get_bits(&s->gb, 8);
1955
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1956
            s->inter_matrix[j] = v;
1957
            s->chroma_inter_matrix[j] = v;
1958
        }
1959
    }
1960
    if (get_bits1(&s->gb)) {
1961
        for(i=0;i<64;i++) {
1962
            v = get_bits(&s->gb, 8);
1963
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1964
            s->chroma_intra_matrix[j] = v;
1965
        }
1966
    }
1967
    if (get_bits1(&s->gb)) {
1968
        for(i=0;i<64;i++) {
1969
            v = get_bits(&s->gb, 8);
1970
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1971
            s->chroma_inter_matrix[j] = v;
1972
        }
1973
    }
1974
}
1975

    
1976
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1977
{
1978
    s->full_pel[0] = s->full_pel[1] = 0;
1979
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1980
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1981
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1982
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1983
    s->intra_dc_precision = get_bits(&s->gb, 2);
1984
    s->picture_structure = get_bits(&s->gb, 2);
1985
    s->top_field_first = get_bits1(&s->gb);
1986
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1987
    s->concealment_motion_vectors = get_bits1(&s->gb);
1988
    s->q_scale_type = get_bits1(&s->gb);
1989
    s->intra_vlc_format = get_bits1(&s->gb);
1990
    s->alternate_scan = get_bits1(&s->gb);
1991
    s->repeat_first_field = get_bits1(&s->gb);
1992
    s->chroma_420_type = get_bits1(&s->gb);
1993
    s->progressive_frame = get_bits1(&s->gb);
1994

    
1995
    if(s->picture_structure == PICT_FRAME)
1996
        s->first_field=0;
1997
    else{
1998
        s->first_field ^= 1;
1999
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2000
    }
2001
    
2002
    if(s->alternate_scan){
2003
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2004
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2005
    }else{
2006
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2007
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2008
    }
2009
    
2010
    /* composite display not parsed */
2011
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2012
    dprintf("picture_structure=%d\n", s->picture_structure);
2013
    dprintf("top field first=%d\n", s->top_field_first);
2014
    dprintf("repeat first field=%d\n", s->repeat_first_field);
2015
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
2016
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2017
    dprintf("alternate_scan=%d\n", s->alternate_scan);
2018
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2019
    dprintf("progressive_frame=%d\n", s->progressive_frame);
2020
}
2021

    
2022
static void mpeg_decode_extension(AVCodecContext *avctx, 
2023
                                  uint8_t *buf, int buf_size)
2024
{
2025
    Mpeg1Context *s1 = avctx->priv_data;
2026
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2027
    int ext_type;
2028

    
2029
    init_get_bits(&s->gb, buf, buf_size*8);
2030
    
2031
    ext_type = get_bits(&s->gb, 4);
2032
    switch(ext_type) {
2033
    case 0x1:
2034
        mpeg_decode_sequence_extension(s);
2035
        break;
2036
    case 0x2:
2037
        mpeg_decode_sequence_display_extension(s1);
2038
        break;
2039
    case 0x3:
2040
        mpeg_decode_quant_matrix_extension(s);
2041
        break;
2042
    case 0x7:
2043
        mpeg_decode_picture_display_extension(s1);
2044
        break;
2045
    case 0x8:
2046
        mpeg_decode_picture_coding_extension(s);
2047
        break;
2048
    }
2049
}
2050

    
2051
static void exchange_uv(MpegEncContext *s){
2052
short * tmp;
2053

    
2054
    tmp = s->pblocks[4];
2055
    s->pblocks[4] = s->pblocks[5];
2056
    s->pblocks[5] = tmp;
2057
}
2058

    
2059
static int mpeg_field_start(MpegEncContext *s){
2060
    AVCodecContext *avctx= s->avctx;
2061
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2062

    
2063
    /* start frame decoding */
2064
    if(s->first_field || s->picture_structure==PICT_FRAME){
2065
        if(MPV_frame_start(s, avctx) < 0)
2066
            return -1;
2067

    
2068
        ff_er_frame_start(s);
2069

    
2070
        /* first check if we must repeat the frame */
2071
        s->current_picture_ptr->repeat_pict = 0;
2072
        if (s->repeat_first_field) {
2073
            if (s->progressive_sequence) {
2074
                if (s->top_field_first)
2075
                    s->current_picture_ptr->repeat_pict = 4;
2076
                else
2077
                    s->current_picture_ptr->repeat_pict = 2;
2078
            } else if (s->progressive_frame) {
2079
                s->current_picture_ptr->repeat_pict = 1;
2080
            }
2081
        }         
2082

    
2083
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2084
    }else{ //second field
2085
            int i;
2086
            
2087
            if(!s->current_picture_ptr){
2088
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2089
                return -1;
2090
            }
2091
            
2092
            for(i=0; i<4; i++){
2093
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2094
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2095
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2096
                } 
2097
            }
2098
    }
2099
#ifdef HAVE_XVMC
2100
// MPV_frame_start will call this function too,
2101
// but we need to call it on every field
2102
    if(s->avctx->xvmc_acceleration)
2103
         XVMC_field_start(s,avctx);
2104
#endif
2105

    
2106
    return 0;
2107
}
2108

    
2109
#define DECODE_SLICE_ERROR -1
2110
#define DECODE_SLICE_OK 0
2111

    
2112
/**
2113
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2114
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2115
 *         DECODE_SLICE_OK if this slice is ok<br>
2116
 */
2117
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2118
                              uint8_t **buf, int buf_size)
2119
{
2120
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2121
    AVCodecContext *avctx= s->avctx;
2122
    int ret;
2123
    const int field_pic= s->picture_structure != PICT_FRAME;
2124

    
2125
    s->resync_mb_x=
2126
    s->resync_mb_y= -1;
2127

    
2128
    if (mb_y >= s->mb_height){
2129
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", s->mb_y, s->mb_height);
2130
        return -1;
2131
    }
2132
    
2133
    init_get_bits(&s->gb, *buf, buf_size*8);
2134

    
2135
    ff_mpeg1_clean_buffers(s);
2136
    s->interlaced_dct = 0;
2137

    
2138
    s->qscale = get_qscale(s);
2139

    
2140
    if(s->qscale == 0){
2141
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2142
        return -1;
2143
    }
2144
    
2145
    /* extra slice info */
2146
    while (get_bits1(&s->gb) != 0) {
2147
        skip_bits(&s->gb, 8);
2148
    }
2149
    
2150
    s->mb_x=0;
2151

    
2152
    for(;;) {
2153
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2154
        if (code < 0){
2155
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2156
            return -1;
2157
        }
2158
        if (code >= 33) {
2159
            if (code == 33) {
2160
                s->mb_x += 33;
2161
            }
2162
            /* otherwise, stuffing, nothing to do */
2163
        } else {
2164
            s->mb_x += code;
2165
            break;
2166
        }
2167
    }
2168

    
2169
    s->resync_mb_x= s->mb_x;
2170
    s->resync_mb_y= s->mb_y= mb_y;
2171
    s->mb_skip_run= 0;
2172
    ff_init_block_index(s);
2173

    
2174
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2175
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2176
             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", 
2177
                 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],
2178
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2179
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2180
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2181
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2182
        }
2183
    }    
2184
    
2185
    for(;;) {
2186
#ifdef HAVE_XVMC
2187
        //one 1 we memcpy blocks in xvmcvideo
2188
        if(s->avctx->xvmc_acceleration > 1)
2189
            XVMC_init_block(s);//set s->block
2190
#endif
2191

    
2192
        s->dsp.clear_blocks(s->block[0]);
2193

    
2194
        ret = mpeg_decode_mb(s, s->block);
2195
        s->chroma_qscale= s->qscale;
2196

    
2197
        dprintf("ret=%d\n", ret);
2198
        if (ret < 0)
2199
            return -1;
2200

    
2201
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2202
            const int wrap = field_pic ? 2*s->block_wrap[0] : s->block_wrap[0];
2203
            int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2204
            int motion_x, motion_y, dir, i;
2205
            if(field_pic && !s->first_field)
2206
                xy += wrap/2;
2207

    
2208
            for(dir=0; dir<2; dir++){
2209
                for(i=0; i<2; i++){
2210
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2211
                        motion_x = motion_y = 0;
2212
                    }else if (s->mv_type == MV_TYPE_16X16){
2213
                        motion_x = s->mv[dir][0][0];
2214
                        motion_y = s->mv[dir][0][1];
2215
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2216
                        motion_x = s->mv[dir][i][0];
2217
                        motion_y = s->mv[dir][i][1];
2218
                    }
2219
                    
2220
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2221
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2222
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2223
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2224
                    xy += wrap;
2225
                }
2226
            }
2227
        }
2228

    
2229
        s->dest[0] += 16;
2230
        s->dest[1] += 8;
2231
        s->dest[2] += 8;
2232

    
2233
        MPV_decode_mb(s, s->block);
2234
        
2235
        if (++s->mb_x >= s->mb_width) {
2236

    
2237
            ff_draw_horiz_band(s, 16*s->mb_y, 16);
2238

    
2239
            s->mb_x = 0;
2240
            s->mb_y++;
2241

    
2242
            if(s->mb_y<<field_pic >= s->mb_height){
2243
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2244

    
2245
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2246
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2247
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2248
                    return -1;
2249
                }else
2250
                    goto eos;
2251
            }
2252
            
2253
            ff_init_block_index(s);
2254
        }
2255

    
2256
        /* skip mb handling */
2257
        if (s->mb_skip_run == -1) {
2258
            /* read again increment */
2259
            s->mb_skip_run = 0;
2260
            for(;;) {
2261
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2262
                if (code < 0){
2263
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2264
                    return -1;
2265
                }
2266
                if (code >= 33) {
2267
                    if (code == 33) {
2268
                        s->mb_skip_run += 33;
2269
                    }else if(code == 35){
2270
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2271
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2272
                            return -1;
2273
                        }
2274
                        goto eos; /* end of slice */
2275
                    }
2276
                    /* otherwise, stuffing, nothing to do */
2277
                } else {
2278
                    s->mb_skip_run += code;
2279
                    break;
2280
                }
2281
            }
2282
        }
2283
    }
2284
eos: // end of slice
2285
    *buf += get_bits_count(&s->gb)/8 - 1;
2286
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2287
    return 0;
2288
}
2289

    
2290
static int slice_decode_thread(AVCodecContext *c, void *arg){
2291
    MpegEncContext *s= arg;
2292
    uint8_t *buf= s->gb.buffer;
2293
    int mb_y= s->start_mb_y;
2294

    
2295
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2296

    
2297
    for(;;){
2298
        int start_code, ret;
2299

    
2300
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2301
        emms_c();
2302
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 
2303
//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);
2304
        if(ret < 0){
2305
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2306
                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);
2307
        }else{
2308
            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);
2309
        }
2310
        
2311
        if(s->mb_y == s->end_mb_y)
2312
            return 0;
2313
        
2314
        start_code = find_start_code(&buf, s->gb.buffer_end);
2315
        mb_y= start_code - SLICE_MIN_START_CODE;
2316
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2317
            return -1;
2318
    }
2319
    
2320
    return 0; //not reached
2321
}
2322

    
2323
/**
2324
 * handles slice ends.
2325
 * @return 1 if it seems to be the last slice of 
2326
 */
2327
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2328
{
2329
    Mpeg1Context *s1 = avctx->priv_data;
2330
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2331
       
2332
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2333
        return 0;
2334

    
2335
#ifdef HAVE_XVMC
2336
    if(s->avctx->xvmc_acceleration)
2337
        XVMC_field_end(s);
2338
#endif
2339
    /* end of slice reached */
2340
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2341
        /* end of image */
2342

    
2343
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2344

    
2345
        ff_er_frame_end(s);
2346

    
2347
        MPV_frame_end(s);
2348

    
2349
        if (s->pict_type == B_TYPE || s->low_delay) {
2350
            *pict= *(AVFrame*)s->current_picture_ptr;
2351
            ff_print_debug_info(s, pict);
2352
        } else {
2353
            s->picture_number++;
2354
            /* latency of 1 frame for I and P frames */
2355
            /* XXX: use another variable than picture_number */
2356
            if (s->last_picture_ptr != NULL) {
2357
                *pict= *(AVFrame*)s->last_picture_ptr;
2358
                 ff_print_debug_info(s, pict);
2359
            }
2360
        }
2361

    
2362
        return 1;
2363
    } else {
2364
        return 0;
2365
    }
2366
}
2367

    
2368
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2369
                                 uint8_t *buf, int buf_size)
2370
{
2371
    Mpeg1Context *s1 = avctx->priv_data;
2372
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2373
    int width, height, i, v, j;
2374
    float aspect;
2375

    
2376
    init_get_bits(&s->gb, buf, buf_size*8);
2377

    
2378
    width = get_bits(&s->gb, 12);
2379
    height = get_bits(&s->gb, 12);
2380
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2381
    if (s->aspect_ratio_info == 0)
2382
        return -1;
2383
    aspect= 1.0/mpeg1_aspect[s->aspect_ratio_info];
2384
    avctx->sample_aspect_ratio= av_d2q(aspect, 255);
2385

    
2386
    s->frame_rate_index = get_bits(&s->gb, 4);
2387
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2388
        return -1;
2389
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2390
    if (get_bits1(&s->gb) == 0) /* marker */
2391
        return -1;
2392
    if (width <= 0 || height <= 0 ||
2393
        (width % 2) != 0 || (height % 2) != 0)
2394
        return -1;
2395
    if (width != s->width ||
2396
        height != s->height) {
2397
        /* start new mpeg1 context decoding */
2398
        s->out_format = FMT_MPEG1;
2399
        if (s1->mpeg_enc_ctx_allocated) {
2400
            MPV_common_end(s);
2401
        }
2402
        s->width = width;
2403
        s->height = height;
2404
        avctx->has_b_frames= 1;
2405
        avctx->width = width;
2406
        avctx->height = height;
2407
        avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
2408
        avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
2409
        avctx->bit_rate = s->bit_rate;
2410
        
2411
        if(avctx->xvmc_acceleration){
2412
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2413
        }else{
2414
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2415
        }
2416
        
2417
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2418
            if( avctx->idct_algo == FF_IDCT_AUTO )
2419
                avctx->idct_algo = FF_IDCT_SIMPLE;
2420

    
2421
        if (MPV_common_init(s) < 0)
2422
            return -1;
2423
        s1->mpeg_enc_ctx_allocated = 1;
2424
        s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2425
    }
2426

    
2427
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2428
    skip_bits(&s->gb, 1);
2429

    
2430
    /* get matrix */
2431
    if (get_bits1(&s->gb)) {
2432
        for(i=0;i<64;i++) {
2433
            v = get_bits(&s->gb, 8);
2434
            if(v==0){
2435
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2436
                return -1;
2437
            }
2438
            j = s->intra_scantable.permutated[i];
2439
            s->intra_matrix[j] = v;
2440
            s->chroma_intra_matrix[j] = v;
2441
        }
2442
#ifdef DEBUG
2443
        dprintf("intra matrix present\n");
2444
        for(i=0;i<64;i++)
2445
            dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2446
        printf("\n");
2447
#endif
2448
    } else {
2449
        for(i=0;i<64;i++) {
2450
            int j= s->dsp.idct_permutation[i];
2451
            v = ff_mpeg1_default_intra_matrix[i];
2452
            s->intra_matrix[j] = v;
2453
            s->chroma_intra_matrix[j] = v;
2454
        }
2455
    }
2456
    if (get_bits1(&s->gb)) {
2457
        for(i=0;i<64;i++) {
2458
            v = get_bits(&s->gb, 8);
2459
            if(v==0){
2460
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2461
                return -1;
2462
            }
2463
            j = s->intra_scantable.permutated[i];
2464
            s->inter_matrix[j] = v;
2465
            s->chroma_inter_matrix[j] = v;
2466
        }
2467
#ifdef DEBUG
2468
        dprintf("non intra matrix present\n");
2469
        for(i=0;i<64;i++)
2470
            dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2471
        printf("\n");
2472
#endif
2473
    } else {
2474
        for(i=0;i<64;i++) {
2475
            int j= s->dsp.idct_permutation[i];
2476
            v = ff_mpeg1_default_non_intra_matrix[i];
2477
            s->inter_matrix[j] = v;
2478
            s->chroma_inter_matrix[j] = v;
2479
        }
2480
    }
2481
    
2482
    if(show_bits(&s->gb, 23) != 0){
2483
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2484
        return -1;
2485
    }
2486

    
2487
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2488
    s->progressive_sequence = 1;
2489
    s->progressive_frame = 1;
2490
    s->picture_structure = PICT_FRAME;
2491
    s->frame_pred_frame_dct = 1;
2492
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2493
    avctx->sub_id = 1; /* indicates mpeg1 */
2494
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2495
    
2496
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2497
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2498
               s->avctx->rc_buffer_size, s->bit_rate);
2499
    
2500
    return 0;
2501
}
2502

    
2503
static int vcr2_init_sequence(AVCodecContext *avctx)
2504
{
2505
    Mpeg1Context *s1 = avctx->priv_data;
2506
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2507
    int i, v;
2508

    
2509
    /* start new mpeg1 context decoding */
2510
    s->out_format = FMT_MPEG1;
2511
    if (s1->mpeg_enc_ctx_allocated) {
2512
        MPV_common_end(s);
2513
    }
2514
    s->width = avctx->width;
2515
    s->height = avctx->height;
2516
    avctx->has_b_frames= 0; //true?
2517
    s->low_delay= 1;
2518

    
2519
    if(avctx->xvmc_acceleration){
2520
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2521
    }else{
2522
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2523
    }
2524

    
2525
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2526
        if( avctx->idct_algo == FF_IDCT_AUTO )
2527
            avctx->idct_algo = FF_IDCT_SIMPLE;
2528
    
2529
    if (MPV_common_init(s) < 0)
2530
        return -1;
2531
    exchange_uv(s);//common init reset pblocks, so we swap them here
2532
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2533
    s1->mpeg_enc_ctx_allocated = 1;
2534

    
2535
    for(i=0;i<64;i++) {
2536
        int j= s->dsp.idct_permutation[i];
2537
        v = ff_mpeg1_default_intra_matrix[i];
2538
        s->intra_matrix[j] = v;
2539
        s->chroma_intra_matrix[j] = v;
2540

    
2541
        v = ff_mpeg1_default_non_intra_matrix[i];
2542
        s->inter_matrix[j] = v;
2543
        s->chroma_inter_matrix[j] = v;
2544
    }
2545

    
2546
    s->progressive_sequence = 1;
2547
    s->progressive_frame = 1;
2548
    s->picture_structure = PICT_FRAME;
2549
    s->frame_pred_frame_dct = 1;
2550
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2551
    avctx->sub_id = 2; /* indicates mpeg2 */
2552
    return 0;
2553
}
2554

    
2555

    
2556
static void mpeg_decode_user_data(AVCodecContext *avctx, 
2557
                                  const uint8_t *buf, int buf_size)
2558
{
2559
    const uint8_t *p;
2560
    int len, flags;
2561
    p = buf;
2562
    len = buf_size;
2563

    
2564
    /* we parse the DTG active format information */
2565
    if (len >= 5 &&
2566
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2567
        flags = p[4];
2568
        p += 5;
2569
        len -= 5;
2570
        if (flags & 0x80) {
2571
            /* skip event id */
2572
            if (len < 2)
2573
                return;
2574
            p += 2;
2575
            len -= 2;
2576
        }
2577
        if (flags & 0x40) {
2578
            if (len < 1)
2579
                return;
2580
            avctx->dtg_active_format = p[0] & 0x0f;
2581
        }
2582
    }
2583
}
2584

    
2585
static void mpeg_decode_gop(AVCodecContext *avctx, 
2586
                            uint8_t *buf, int buf_size){
2587
    Mpeg1Context *s1 = avctx->priv_data;
2588
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2589

    
2590
    int drop_frame_flag;
2591
    int time_code_hours, time_code_minutes;
2592
    int time_code_seconds, time_code_pictures;
2593
    int broken_link;
2594

    
2595
    s->first_field = 0;
2596

    
2597
    init_get_bits(&s->gb, buf, buf_size*8);
2598

    
2599
    drop_frame_flag = get_bits1(&s->gb);
2600
    
2601
    time_code_hours=get_bits(&s->gb,5);
2602
    time_code_minutes = get_bits(&s->gb,6);
2603
    skip_bits1(&s->gb);//marker bit
2604
    time_code_seconds = get_bits(&s->gb,6);
2605
    time_code_pictures = get_bits(&s->gb,6);
2606
    /*broken_link indicate that after editing the
2607
      reference frames of the first B-Frames after GOP I-Frame
2608
      are missing (open gop)*/
2609
    broken_link = get_bits1(&s->gb);
2610
    if(broken_link == 1){
2611
//        avcodec_flush_buffers(avctx);
2612
        ff_mpeg_flush(avctx);
2613
    }
2614
}
2615

    
2616
/**
2617
 * finds the end of the current frame in the bitstream.
2618
 * @return the position of the first byte of the next frame, or -1
2619
 */
2620
static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2621
    ParseContext *pc= &s->parse_context;
2622
    int i;
2623
    uint32_t state;
2624
    
2625
    state= pc->state;
2626
    
2627
    i=0;
2628
    if(!pc->frame_start_found){
2629
        for(i=0; i<buf_size; i++){
2630
            state= (state<<8) | buf[i];
2631
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2632
                i++;
2633
                pc->frame_start_found=1;
2634
                break;
2635
            }
2636
        }
2637
    }
2638
    
2639
    if(pc->frame_start_found){
2640
        for(; i<buf_size; i++){
2641
            state= (state<<8) | buf[i];
2642
            if((state&0xFFFFFF00) == 0x100){
2643
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2644
                    pc->frame_start_found=0;
2645
                    pc->state=-1; 
2646
                    return i-3;
2647
                }
2648
            }
2649
        }
2650
    }        
2651
    pc->state= state;
2652
    return END_NOT_FOUND;
2653
}
2654

    
2655
/* handle buffering and image synchronisation */
2656
static int mpeg_decode_frame(AVCodecContext *avctx, 
2657
                             void *data, int *data_size,
2658
                             uint8_t *buf, int buf_size)
2659
{
2660
    Mpeg1Context *s = avctx->priv_data;
2661
    uint8_t *buf_end, *buf_ptr;
2662
    int ret, start_code, input_size;
2663
    AVFrame *picture = data;
2664
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2665
    dprintf("fill_buffer\n");
2666

    
2667
    *data_size = 0;
2668

    
2669
    /* special case for last picture */
2670
    if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2671
        *picture= *(AVFrame*)s2->next_picture_ptr;
2672
        s2->next_picture_ptr= NULL;
2673

    
2674
        *data_size = sizeof(AVFrame);
2675
        return 0;
2676
    }
2677

    
2678
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2679
        int next= mpeg1_find_frame_end(s2, buf, buf_size);
2680
        
2681
        if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2682
            return buf_size;
2683
    }    
2684
    
2685
    buf_ptr = buf;
2686
    buf_end = buf + buf_size;
2687

    
2688
#if 0    
2689
    if (s->repeat_field % 2 == 1) { 
2690
        s->repeat_field++;
2691
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2692
        //        s2->picture_number, s->repeat_field);
2693
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2694
            *data_size = sizeof(AVPicture);
2695
            goto the_end;
2696
        }
2697
    }
2698
#endif
2699

    
2700
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2701
        vcr2_init_sequence(avctx);
2702
    
2703
    s->slice_count= 0;
2704
        
2705
    for(;;) {
2706
        /* find start next code */
2707
        start_code = find_start_code(&buf_ptr, buf_end);
2708
        if (start_code < 0){
2709
            if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2710
                if(avctx->thread_count > 1){
2711
                    int i;
2712

    
2713
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2714
                    for(i=0; i<s->slice_count; i++)
2715
                        s2->error_count += s2->thread_context[i]->error_count;
2716
                }
2717
                if (slice_end(avctx, picture)) {
2718
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2719
                        *data_size = sizeof(AVPicture);
2720
                }
2721
            }
2722
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2723
        }
2724
        
2725
        input_size = buf_end - buf_ptr;
2726

    
2727
        if(avctx->debug & FF_DEBUG_STARTCODE){
2728
            av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2729
        }
2730

    
2731
                /* prepare data for next start code */
2732
                switch(start_code) {
2733
                case SEQ_START_CODE:
2734
                    mpeg1_decode_sequence(avctx, buf_ptr, 
2735
                                          input_size);
2736
                    break;
2737
                            
2738
                case PICTURE_START_CODE:
2739
                    /* we have a complete image : we try to decompress it */
2740
                    mpeg1_decode_picture(avctx, 
2741
                                         buf_ptr, input_size);
2742
                    break;
2743
                case EXT_START_CODE:
2744
                    mpeg_decode_extension(avctx,
2745
                                          buf_ptr, input_size);
2746
                    break;
2747
                case USER_START_CODE:
2748
                    mpeg_decode_user_data(avctx, 
2749
                                          buf_ptr, input_size);
2750
                    break;
2751
                case GOP_START_CODE:
2752
                        mpeg_decode_gop(avctx, buf_ptr, input_size);
2753
                    break;
2754
                default:
2755
                    if (start_code >= SLICE_MIN_START_CODE &&
2756
                        start_code <= SLICE_MAX_START_CODE) {
2757
                        int mb_y= start_code - SLICE_MIN_START_CODE;
2758
                        
2759
                        /* skip b frames if we dont have reference frames */
2760
                        if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2761
                        /* skip b frames if we are in a hurry */
2762
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2763
                        /* skip everything if we are in a hurry>=5 */
2764
                        if(avctx->hurry_up>=5) break;
2765
                        
2766
                        if (!s->mpeg_enc_ctx_allocated) break;
2767
                        
2768
                        if(s2->first_slice){
2769
                            s2->first_slice=0;
2770
                            if(mpeg_field_start(s2) < 0)
2771
                                return -1;
2772
                        }
2773
                        
2774
                        if(avctx->thread_count > 1){
2775
                            int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2776
                            if(threshold <= mb_y){
2777
                                MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2778
                                
2779
                                thread_context->start_mb_y= mb_y;
2780
                                thread_context->end_mb_y  = s2->mb_height;
2781
                                if(s->slice_count){
2782
                                    s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2783
                                    ff_update_duplicate_context(thread_context, s2);
2784
                                }
2785
                                init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2786
                                s->slice_count++;
2787
                            }
2788
                            buf_ptr += 2; //FIXME add minimum num of bytes per slice
2789
                        }else{
2790
                            ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2791
                            emms_c();
2792

    
2793
                            if(ret < 0){
2794
                                if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2795
                                    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);
2796
                            }else{
2797
                                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);
2798
                            }
2799
                        }
2800
                    }
2801
                    break;
2802
                }
2803
    }
2804
}
2805

    
2806
static int mpeg_decode_end(AVCodecContext *avctx)
2807
{
2808
    Mpeg1Context *s = avctx->priv_data;
2809

    
2810
    if (s->mpeg_enc_ctx_allocated)
2811
        MPV_common_end(&s->mpeg_enc_ctx);
2812
    return 0;
2813
}
2814

    
2815
AVCodec mpeg1video_decoder = {
2816
    "mpeg1video",
2817
    CODEC_TYPE_VIDEO,
2818
    CODEC_ID_MPEG1VIDEO,
2819
    sizeof(Mpeg1Context),
2820
    mpeg_decode_init,
2821
    NULL,
2822
    mpeg_decode_end,
2823
    mpeg_decode_frame,
2824
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2825
    .flush= ff_mpeg_flush,
2826
};
2827

    
2828
AVCodec mpeg2video_decoder = {
2829
    "mpeg2video",
2830
    CODEC_TYPE_VIDEO,
2831
    CODEC_ID_MPEG2VIDEO,
2832
    sizeof(Mpeg1Context),
2833
    mpeg_decode_init,
2834
    NULL,
2835
    mpeg_decode_end,
2836
    mpeg_decode_frame,
2837
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2838
    .flush= ff_mpeg_flush,
2839
};
2840

    
2841
//legacy decoder
2842
AVCodec mpegvideo_decoder = {
2843
    "mpegvideo",
2844
    CODEC_TYPE_VIDEO,
2845
    CODEC_ID_MPEG2VIDEO,
2846
    sizeof(Mpeg1Context),
2847
    mpeg_decode_init,
2848
    NULL,
2849
    mpeg_decode_end,
2850
    mpeg_decode_frame,
2851
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2852
    .flush= ff_mpeg_flush,
2853
};
2854

    
2855
#ifdef CONFIG_ENCODERS
2856

    
2857
AVCodec mpeg1video_encoder = {
2858
    "mpeg1video",
2859
    CODEC_TYPE_VIDEO,
2860
    CODEC_ID_MPEG1VIDEO,
2861
    sizeof(MpegEncContext),
2862
    encode_init,
2863
    MPV_encode_picture,
2864
    MPV_encode_end,
2865
    .supported_framerates= frame_rate_tab+1,
2866
};
2867

    
2868
#ifdef CONFIG_RISKY
2869

    
2870
AVCodec mpeg2video_encoder = {
2871
    "mpeg2video",
2872
    CODEC_TYPE_VIDEO,
2873
    CODEC_ID_MPEG2VIDEO,
2874
    sizeof(MpegEncContext),
2875
    encode_init,
2876
    MPV_encode_picture,
2877
    MPV_encode_end,
2878
    .supported_framerates= frame_rate_tab+1,
2879
};
2880
#endif
2881
#endif
2882

    
2883
#ifdef HAVE_XVMC
2884
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2885
    Mpeg1Context *s;
2886

    
2887
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2888
        return -1;
2889
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2890
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2891
    }
2892
    mpeg_decode_init(avctx);
2893
    s = avctx->priv_data;
2894

    
2895
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2896
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2897

    
2898
    return 0;
2899
}
2900

    
2901
AVCodec mpeg_xvmc_decoder = {
2902
    "mpegvideo_xvmc",
2903
    CODEC_TYPE_VIDEO,
2904
    CODEC_ID_MPEG2VIDEO_XVMC,
2905
    sizeof(Mpeg1Context),
2906
    mpeg_mc_decode_init,
2907
    NULL,
2908
    mpeg_decode_end,
2909
    mpeg_decode_frame,
2910
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
2911
    .flush= ff_mpeg_flush,
2912
};
2913

    
2914
#endif
2915

    
2916
/* this is ugly i know, but the alternative is too make 
2917
   hundreds of vars global and prefix them with ff_mpeg1_
2918
   which is far uglier. */
2919
#include "mdec.c"