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ffmpeg / libavcodec / mpeg12.c @ 29644cb5

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

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

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

    
33
#include "mpeg12data.h"
34
#include "bytestream.h"
35

    
36
//#undef NDEBUG
37
//#include <assert.h>
38

    
39

    
40
/* Start codes. */
41
#define SEQ_END_CODE            0x000001b7
42
#define SEQ_START_CODE          0x000001b3
43
#define GOP_START_CODE          0x000001b8
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#define PICTURE_START_CODE      0x00000100
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#define SLICE_MIN_START_CODE    0x00000101
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#define SLICE_MAX_START_CODE    0x000001af
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#define EXT_START_CODE          0x000001b5
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#define USER_START_CODE         0x000001b2
49

    
50
#define DC_VLC_BITS 9
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#define MV_VLC_BITS 9
52
#define MBINCR_VLC_BITS 9
53
#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
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#define TEX_VLC_BITS 9
57

    
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#ifdef CONFIG_ENCODERS
59
static void mpeg1_encode_block(MpegEncContext *s,
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                         DCTELEM *block,
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                         int component);
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static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
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#endif //CONFIG_ENCODERS
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
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static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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                              DCTELEM *block,
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                              int n);
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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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                                        DCTELEM *block,
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                                        int n);
74
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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                                    DCTELEM *block,
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                                    int n);
77
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
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static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
79
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
80
static void exchange_uv(MpegEncContext *s);
81

    
82
#ifdef HAVE_XVMC
83
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
84
extern int XVMC_field_end(MpegEncContext *s);
85
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
86
extern void XVMC_init_block(MpegEncContext *s);//set s->block
87
#endif
88

    
89
static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
90
static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
91
static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
92
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
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                                           PIX_FMT_XVMC_MPEG2_IDCT,
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                                           PIX_FMT_XVMC_MPEG2_MC,
95
                                           -1};
96
#ifdef CONFIG_ENCODERS
97
static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
98
static uint8_t fcode_tab[MAX_MV*2+1];
99

    
100
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
101
static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
102

    
103
/* simple include everything table for dc, first byte is bits number next 3 are code*/
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static uint32_t mpeg1_lum_dc_uni[512];
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static uint32_t mpeg1_chr_dc_uni[512];
106

    
107
static uint8_t mpeg1_index_run[2][64];
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static int8_t mpeg1_max_level[2][64];
109
#endif //CONFIG_ENCODERS
110

    
111
static uint8_t static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
112

    
113
static void init_2d_vlc_rl(RLTable *rl, int use_static)
114
{
115
    int i;
116

    
117
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
118
             &rl->table_vlc[0][1], 4, 2,
119
             &rl->table_vlc[0][0], 4, 2, use_static);
120

    
121
    if(use_static)
122
        rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
123
    else
124
        rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
125

    
126
    for(i=0; i<rl->vlc.table_size; i++){
127
        int code= rl->vlc.table[i][0];
128
        int len = rl->vlc.table[i][1];
129
        int level, run;
130

    
131
        if(len==0){ // illegal code
132
            run= 65;
133
            level= MAX_LEVEL;
134
        }else if(len<0){ //more bits needed
135
            run= 0;
136
            level= code;
137
        }else{
138
            if(code==rl->n){ //esc
139
                run= 65;
140
                level= 0;
141
            }else if(code==rl->n+1){ //eob
142
                run= 0;
143
                level= 127;
144
            }else{
145
                run=   rl->table_run  [code] + 1;
146
                level= rl->table_level[code];
147
            }
148
        }
149
        rl->rl_vlc[0][i].len= len;
150
        rl->rl_vlc[0][i].level= level;
151
        rl->rl_vlc[0][i].run= run;
152
    }
153
}
154

    
155
#ifdef CONFIG_ENCODERS
156
static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
157
    int i;
158

    
159
    for(i=0; i<128; i++){
160
        int level= i-64;
161
        int run;
162
        for(run=0; run<64; run++){
163
            int len, bits, code;
164

    
165
            int alevel= FFABS(level);
166
            int sign= (level>>31)&1;
167

    
168
            if (alevel > rl->max_level[0][run])
169
                code= 111; /*rl->n*/
170
            else
171
                code= rl->index_run[0][run] + alevel - 1;
172

    
173
            if (code < 111 /* rl->n */) {
174
                /* store the vlc & sign at once */
175
                len=   rl->table_vlc[code][1]+1;
176
                bits= (rl->table_vlc[code][0]<<1) + sign;
177
            } else {
178
                len=  rl->table_vlc[111/*rl->n*/][1]+6;
179
                bits= rl->table_vlc[111/*rl->n*/][0]<<6;
180

    
181
                bits|= run;
182
                if (alevel < 128) {
183
                    bits<<=8; len+=8;
184
                    bits|= level & 0xff;
185
                } else {
186
                    bits<<=16; len+=16;
187
                    bits|= level & 0xff;
188
                    if (level < 0) {
189
                        bits|= 0x8001 + level + 255;
190
                    } else {
191
                        bits|= level & 0xffff;
192
                    }
193
                }
194
            }
195

    
196
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
197
        }
198
    }
199
}
200

    
201

    
202
static int find_frame_rate_index(MpegEncContext *s){
203
    int i;
204
    int64_t dmin= INT64_MAX;
205
    int64_t d;
206

    
207
    for(i=1;i<14;i++) {
208
        int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
209
        int64_t n1= 1001LL*s->avctx->time_base.den;
210
        if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
211

    
212
        d = FFABS(n0 - n1);
213
        if(d < dmin){
214
            dmin=d;
215
            s->frame_rate_index= i;
216
        }
217
    }
218
    if(dmin)
219
        return -1;
220
    else
221
        return 0;
222
}
223

    
224
static int encode_init(AVCodecContext *avctx)
225
{
226
    MpegEncContext *s = avctx->priv_data;
227

    
228
    if(MPV_encode_init(avctx) < 0)
229
        return -1;
230

    
231
    if(find_frame_rate_index(s) < 0){
232
        if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
233
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
234
            return -1;
235
        }else{
236
            av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
237
        }
238
    }
239

    
240
    if(avctx->profile == FF_PROFILE_UNKNOWN){
241
        if(avctx->level != FF_LEVEL_UNKNOWN){
242
            av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
243
            return -1;
244
        }
245
        avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
246
    }
247

    
248
    if(avctx->level == FF_LEVEL_UNKNOWN){
249
        if(avctx->profile == 0){ /* 4:2:2 */
250
            if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
251
            else                                            avctx->level = 2; /* High */
252
        }else{
253
            if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
254
                av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
255
                return -1;
256
            }
257
            if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
258
            else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
259
            else                                            avctx->level = 4; /* High */
260
        }
261
    }
262

    
263
    if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
264
        av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
265
        return -1;
266
    }
267

    
268
    return 0;
269
}
270

    
271
static void put_header(MpegEncContext *s, int header)
272
{
273
    align_put_bits(&s->pb);
274
    put_bits(&s->pb, 16, header>>16);
275
    put_bits(&s->pb, 16, header&0xFFFF);
276
}
277

    
278
/* put sequence header if needed */
279
static void mpeg1_encode_sequence_header(MpegEncContext *s)
280
{
281
        unsigned int vbv_buffer_size;
282
        unsigned int fps, v;
283
        int i;
284
        uint64_t time_code;
285
        float best_aspect_error= 1E10;
286
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
287
        int constraint_parameter_flag;
288

    
289
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
290

    
291
        if (s->current_picture.key_frame) {
292
            AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
293

    
294
            /* mpeg1 header repeated every gop */
295
            put_header(s, SEQ_START_CODE);
296

    
297
            put_bits(&s->pb, 12, s->width);
298
            put_bits(&s->pb, 12, s->height);
299

    
300
            for(i=1; i<15; i++){
301
                float error= aspect_ratio;
302
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
303
                    error-= 1.0/mpeg1_aspect[i];
304
                else
305
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
306

    
307
                error= FFABS(error);
308

    
309
                if(error < best_aspect_error){
310
                    best_aspect_error= error;
311
                    s->aspect_ratio_info= i;
312
                }
313
            }
314

    
315
            put_bits(&s->pb, 4, s->aspect_ratio_info);
316
            put_bits(&s->pb, 4, s->frame_rate_index);
317

    
318
            if(s->avctx->rc_max_rate){
319
                v = (s->avctx->rc_max_rate + 399) / 400;
320
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
321
                    v = 0x3ffff;
322
            }else{
323
                v= 0x3FFFF;
324
            }
325

    
326
            if(s->avctx->rc_buffer_size)
327
                vbv_buffer_size = s->avctx->rc_buffer_size;
328
            else
329
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
330
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
331
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
332

    
333
            put_bits(&s->pb, 18, v & 0x3FFFF);
334
            put_bits(&s->pb, 1, 1); /* marker */
335
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
336

    
337
            constraint_parameter_flag=
338
                s->width <= 768 && s->height <= 576 &&
339
                s->mb_width * s->mb_height <= 396 &&
340
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
341
                framerate.num <= framerate.den*30 &&
342
                s->avctx->me_range && s->avctx->me_range < 128 &&
343
                vbv_buffer_size <= 20 &&
344
                v <= 1856000/400 &&
345
                s->codec_id == CODEC_ID_MPEG1VIDEO;
346

    
347
            put_bits(&s->pb, 1, constraint_parameter_flag);
348

    
349
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
350
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
351

    
352
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
353
                put_header(s, EXT_START_CODE);
354
                put_bits(&s->pb, 4, 1); //seq ext
355

    
356
                put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
357

    
358
                put_bits(&s->pb, 3, s->avctx->profile); //profile
359
                put_bits(&s->pb, 4, s->avctx->level); //level
360

    
361
                put_bits(&s->pb, 1, s->progressive_sequence);
362
                put_bits(&s->pb, 2, s->chroma_format);
363
                put_bits(&s->pb, 2, 0); //horizontal size ext
364
                put_bits(&s->pb, 2, 0); //vertical size ext
365
                put_bits(&s->pb, 12, v>>18); //bitrate ext
366
                put_bits(&s->pb, 1, 1); //marker
367
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
368
                put_bits(&s->pb, 1, s->low_delay);
369
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
370
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
371
            }
372

    
373
            put_header(s, GOP_START_CODE);
374
            put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
375
            /* time code : we must convert from the real frame rate to a
376
               fake mpeg frame rate in case of low frame rate */
377
            fps = (framerate.num + framerate.den/2)/ framerate.den;
378
            time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
379

    
380
            s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
381
            if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
382
                /* only works for NTSC 29.97 */
383
                int d = time_code / 17982;
384
                int m = time_code % 17982;
385
                //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
386
                time_code += 18 * d + 2 * ((m - 2) / 1798);
387
            }
388
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
389
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
390
            put_bits(&s->pb, 1, 1);
391
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
392
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
393
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
394
            put_bits(&s->pb, 1, 0); /* broken link */
395
        }
396
}
397

    
398
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
399
    while (run >= 33) {
400
        put_bits(&s->pb, 11, 0x008);
401
        run -= 33;
402
    }
403
    put_bits(&s->pb, mbAddrIncrTable[run][1],
404
             mbAddrIncrTable[run][0]);
405
}
406
#endif //CONFIG_ENCODERS
407

    
408
static void common_init(MpegEncContext *s)
409
{
410

    
411
    s->y_dc_scale_table=
412
    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
413

    
414
}
415

    
416
void ff_mpeg1_clean_buffers(MpegEncContext *s){
417
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
418
    s->last_dc[1] = s->last_dc[0];
419
    s->last_dc[2] = s->last_dc[0];
420
    memset(s->last_mv, 0, sizeof(s->last_mv));
421
}
422

    
423
#ifdef CONFIG_ENCODERS
424

    
425
static av_always_inline void put_qscale(MpegEncContext *s)
426
{
427
    if(s->q_scale_type){
428
        assert(s->qscale>=1 && s->qscale <=12);
429
        put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
430
    }else{
431
        put_bits(&s->pb, 5, s->qscale);
432
    }
433
}
434

    
435
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
436
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
437
    put_qscale(s);
438
    put_bits(&s->pb, 1, 0); /* slice extra information */
439
}
440

    
441
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
442
{
443
    mpeg1_encode_sequence_header(s);
444

    
445
    /* mpeg1 picture header */
446
    put_header(s, PICTURE_START_CODE);
447
    /* temporal reference */
448

    
449
    // RAL: s->picture_number instead of s->fake_picture_number
450
    put_bits(&s->pb, 10, (s->picture_number -
451
                          s->gop_picture_number) & 0x3ff);
452
    put_bits(&s->pb, 3, s->pict_type);
453

    
454
    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
455
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
456

    
457
    // RAL: Forward f_code also needed for B frames
458
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
459
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
460
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
461
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
462
        else
463
            put_bits(&s->pb, 3, 7); /* forward_f_code */
464
    }
465

    
466
    // RAL: Backward f_code necessary for B frames
467
    if (s->pict_type == B_TYPE) {
468
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
469
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
470
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
471
        else
472
            put_bits(&s->pb, 3, 7); /* backward_f_code */
473
    }
474

    
475
    put_bits(&s->pb, 1, 0); /* extra bit picture */
476

    
477
    s->frame_pred_frame_dct = 1;
478
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
479
        put_header(s, EXT_START_CODE);
480
        put_bits(&s->pb, 4, 8); //pic ext
481
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
482
            put_bits(&s->pb, 4, s->f_code);
483
            put_bits(&s->pb, 4, s->f_code);
484
        }else{
485
            put_bits(&s->pb, 8, 255);
486
        }
487
        if (s->pict_type == B_TYPE) {
488
            put_bits(&s->pb, 4, s->b_code);
489
            put_bits(&s->pb, 4, s->b_code);
490
        }else{
491
            put_bits(&s->pb, 8, 255);
492
        }
493
        put_bits(&s->pb, 2, s->intra_dc_precision);
494

    
495
        assert(s->picture_structure == PICT_FRAME);
496
        put_bits(&s->pb, 2, s->picture_structure);
497
        if (s->progressive_sequence) {
498
            put_bits(&s->pb, 1, 0); /* no repeat */
499
        } else {
500
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
501
        }
502
        /* XXX: optimize the generation of this flag with entropy
503
           measures */
504
        s->frame_pred_frame_dct = s->progressive_sequence;
505

    
506
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
507
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
508
        put_bits(&s->pb, 1, s->q_scale_type);
509
        put_bits(&s->pb, 1, s->intra_vlc_format);
510
        put_bits(&s->pb, 1, s->alternate_scan);
511
        put_bits(&s->pb, 1, s->repeat_first_field);
512
        s->progressive_frame = s->progressive_sequence;
513
        put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
514
        put_bits(&s->pb, 1, s->progressive_frame);
515
        put_bits(&s->pb, 1, 0); //composite_display_flag
516
    }
517
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
518
        int i;
519

    
520
        put_header(s, USER_START_CODE);
521
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
522
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
523
        }
524
    }
525

    
526
    s->mb_y=0;
527
    ff_mpeg1_encode_slice_header(s);
528
}
529

    
530
static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
531
                                int has_mv, int field_motion)
532
{
533
    put_bits(&s->pb, n, bits);
534
    if (!s->frame_pred_frame_dct) {
535
        if (has_mv)
536
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
537
        put_bits(&s->pb, 1, s->interlaced_dct);
538
    }
539
}
540

    
541
static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
542
                                                   DCTELEM block[6][64],
543
                                                   int motion_x, int motion_y,
544
                                                   int mb_block_count)
545
{
546
    int i, cbp;
547
    const int mb_x = s->mb_x;
548
    const int mb_y = s->mb_y;
549
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
550

    
551
    /* compute cbp */
552
    cbp = 0;
553
    for(i=0;i<mb_block_count;i++) {
554
        if (s->block_last_index[i] >= 0)
555
            cbp |= 1 << (mb_block_count - 1 - i);
556
    }
557

    
558
    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
559
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
560
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
561
        (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) |
562
        ((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))) {
563
        s->mb_skip_run++;
564
        s->qscale -= s->dquant;
565
        s->skip_count++;
566
        s->misc_bits++;
567
        s->last_bits++;
568
        if(s->pict_type == P_TYPE){
569
            s->last_mv[0][1][0]= s->last_mv[0][0][0]=
570
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
571
        }
572
    } else {
573
        if(first_mb){
574
            assert(s->mb_skip_run == 0);
575
            encode_mb_skip_run(s, s->mb_x);
576
        }else{
577
            encode_mb_skip_run(s, s->mb_skip_run);
578
        }
579

    
580
        if (s->pict_type == I_TYPE) {
581
            if(s->dquant && cbp){
582
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
583
                put_qscale(s);
584
            }else{
585
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
586
                s->qscale -= s->dquant;
587
            }
588
            s->misc_bits+= get_bits_diff(s);
589
            s->i_count++;
590
        } else if (s->mb_intra) {
591
            if(s->dquant && cbp){
592
                put_mb_modes(s, 6, 0x01, 0, 0);
593
                put_qscale(s);
594
            }else{
595
                put_mb_modes(s, 5, 0x03, 0, 0);
596
                s->qscale -= s->dquant;
597
            }
598
            s->misc_bits+= get_bits_diff(s);
599
            s->i_count++;
600
            memset(s->last_mv, 0, sizeof(s->last_mv));
601
        } else if (s->pict_type == P_TYPE) {
602
            if(s->mv_type == MV_TYPE_16X16){
603
                if (cbp != 0) {
604
                    if ((motion_x|motion_y) == 0) {
605
                        if(s->dquant){
606
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
607
                            put_qscale(s);
608
                        }else{
609
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
610
                        }
611
                        s->misc_bits+= get_bits_diff(s);
612
                    } else {
613
                        if(s->dquant){
614
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
615
                            put_qscale(s);
616
                        }else{
617
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
618
                        }
619
                        s->misc_bits+= get_bits_diff(s);
620
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
621
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
622
                        s->mv_bits+= get_bits_diff(s);
623
                    }
624
                } else {
625
                    put_bits(&s->pb, 3, 1); /* motion only */
626
                    if (!s->frame_pred_frame_dct)
627
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
628
                    s->misc_bits+= get_bits_diff(s);
629
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
630
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
631
                    s->qscale -= s->dquant;
632
                    s->mv_bits+= get_bits_diff(s);
633
                }
634
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
635
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
636
            }else{
637
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
638

    
639
                if (cbp) {
640
                    if(s->dquant){
641
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
642
                        put_qscale(s);
643
                    }else{
644
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
645
                    }
646
                } else {
647
                    put_bits(&s->pb, 3, 1); /* motion only */
648
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
649
                    s->qscale -= s->dquant;
650
                }
651
                s->misc_bits+= get_bits_diff(s);
652
                for(i=0; i<2; i++){
653
                    put_bits(&s->pb, 1, s->field_select[0][i]);
654
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
655
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
656
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
657
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
658
                }
659
                s->mv_bits+= get_bits_diff(s);
660
            }
661
            if(cbp) {
662
                if (s->chroma_y_shift) {
663
                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
664
                } else {
665
                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
666
                    put_bits(&s->pb, 2, cbp & 3);
667
                }
668
            }
669
            s->f_count++;
670
        } else{
671
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
672

    
673
            if(s->mv_type == MV_TYPE_16X16){
674
                if (cbp){    // With coded bloc pattern
675
                    if (s->dquant) {
676
                        if(s->mv_dir == MV_DIR_FORWARD)
677
                            put_mb_modes(s, 6, 3, 1, 0);
678
                        else
679
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
680
                        put_qscale(s);
681
                    } else {
682
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
683
                    }
684
                }else{    // No coded bloc pattern
685
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
686
                    if (!s->frame_pred_frame_dct)
687
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
688
                    s->qscale -= s->dquant;
689
                }
690
                s->misc_bits += get_bits_diff(s);
691
                if (s->mv_dir&MV_DIR_FORWARD){
692
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
693
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
694
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
695
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
696
                    s->f_count++;
697
                }
698
                if (s->mv_dir&MV_DIR_BACKWARD){
699
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
700
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
701
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
702
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
703
                    s->b_count++;
704
                }
705
            }else{
706
                assert(s->mv_type == MV_TYPE_FIELD);
707
                assert(!s->frame_pred_frame_dct);
708
                if (cbp){    // With coded bloc pattern
709
                    if (s->dquant) {
710
                        if(s->mv_dir == MV_DIR_FORWARD)
711
                            put_mb_modes(s, 6, 3, 1, 1);
712
                        else
713
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
714
                        put_qscale(s);
715
                    } else {
716
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
717
                    }
718
                }else{    // No coded bloc pattern
719
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
720
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
721
                    s->qscale -= s->dquant;
722
                }
723
                s->misc_bits += get_bits_diff(s);
724
                if (s->mv_dir&MV_DIR_FORWARD){
725
                    for(i=0; i<2; i++){
726
                        put_bits(&s->pb, 1, s->field_select[0][i]);
727
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
728
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
729
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
730
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
731
                    }
732
                    s->f_count++;
733
                }
734
                if (s->mv_dir&MV_DIR_BACKWARD){
735
                    for(i=0; i<2; i++){
736
                        put_bits(&s->pb, 1, s->field_select[1][i]);
737
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
738
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
739
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
740
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
741
                    }
742
                    s->b_count++;
743
                }
744
            }
745
            s->mv_bits += get_bits_diff(s);
746
            if(cbp) {
747
                if (s->chroma_y_shift) {
748
                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
749
                } else {
750
                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
751
                    put_bits(&s->pb, 2, cbp & 3);
752
                }
753
            }
754
        }
755
        for(i=0;i<mb_block_count;i++) {
756
            if (cbp & (1 << (mb_block_count - 1 - i))) {
757
                mpeg1_encode_block(s, block[i], i);
758
            }
759
        }
760
        s->mb_skip_run = 0;
761
        if(s->mb_intra)
762
            s->i_tex_bits+= get_bits_diff(s);
763
        else
764
            s->p_tex_bits+= get_bits_diff(s);
765
    }
766
}
767

    
768
void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
769
{
770
    if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
771
    else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
772
}
773

    
774
// RAL: Parameter added: f_or_b_code
775
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
776
{
777
    int code, bit_size, l, bits, range, sign;
778

    
779
    if (val == 0) {
780
        /* zero vector */
781
        code = 0;
782
        put_bits(&s->pb,
783
                 mbMotionVectorTable[0][1],
784
                 mbMotionVectorTable[0][0]);
785
    } else {
786
        bit_size = f_or_b_code - 1;
787
        range = 1 << bit_size;
788
        /* modulo encoding */
789
        l= INT_BIT - 5 - bit_size;
790
        val= (val<<l)>>l;
791

    
792
        if (val >= 0) {
793
            val--;
794
            code = (val >> bit_size) + 1;
795
            bits = val & (range - 1);
796
            sign = 0;
797
        } else {
798
            val = -val;
799
            val--;
800
            code = (val >> bit_size) + 1;
801
            bits = val & (range - 1);
802
            sign = 1;
803
        }
804

    
805
        assert(code > 0 && code <= 16);
806

    
807
        put_bits(&s->pb,
808
                 mbMotionVectorTable[code][1],
809
                 mbMotionVectorTable[code][0]);
810

    
811
        put_bits(&s->pb, 1, sign);
812
        if (bit_size > 0) {
813
            put_bits(&s->pb, bit_size, bits);
814
        }
815
    }
816
}
817

    
818
void ff_mpeg1_encode_init(MpegEncContext *s)
819
{
820
    static int done=0;
821

    
822
    common_init(s);
823

    
824
    if(!done){
825
        int f_code;
826
        int mv;
827
        int i;
828

    
829
        done=1;
830
        init_rl(&rl_mpeg1, static_rl_table_store[0]);
831
        init_rl(&rl_mpeg2, static_rl_table_store[1]);
832

    
833
        for(i=0; i<64; i++)
834
        {
835
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
836
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
837
        }
838

    
839
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
840
        if(s->intra_vlc_format)
841
            init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
842

    
843
        /* build unified dc encoding tables */
844
        for(i=-255; i<256; i++)
845
        {
846
                int adiff, index;
847
                int bits, code;
848
                int diff=i;
849

    
850
                adiff = FFABS(diff);
851
                if(diff<0) diff--;
852
                index = av_log2(2*adiff);
853

    
854
                bits= vlc_dc_lum_bits[index] + index;
855
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
856
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
857

    
858
                bits= vlc_dc_chroma_bits[index] + index;
859
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
860
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
861
        }
862

    
863
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
864
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
865
                int len;
866

    
867
                if(mv==0) len= mbMotionVectorTable[0][1];
868
                else{
869
                    int val, bit_size, range, code;
870

    
871
                    bit_size = f_code - 1;
872
                    range = 1 << bit_size;
873

    
874
                    val=mv;
875
                    if (val < 0)
876
                        val = -val;
877
                    val--;
878
                    code = (val >> bit_size) + 1;
879
                    if(code<17){
880
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
881
                    }else{
882
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
883
                    }
884
                }
885

    
886
                mv_penalty[f_code][mv+MAX_MV]= len;
887
            }
888
        }
889

    
890

    
891
        for(f_code=MAX_FCODE; f_code>0; f_code--){
892
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
893
                fcode_tab[mv+MAX_MV]= f_code;
894
            }
895
        }
896
    }
897
    s->me.mv_penalty= mv_penalty;
898
    s->fcode_tab= fcode_tab;
899
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
900
        s->min_qcoeff=-255;
901
        s->max_qcoeff= 255;
902
    }else{
903
        s->min_qcoeff=-2047;
904
        s->max_qcoeff= 2047;
905
    }
906
    if (s->intra_vlc_format) {
907
        s->intra_ac_vlc_length=
908
        s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
909
    } else {
910
        s->intra_ac_vlc_length=
911
        s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
912
    }
913
    s->inter_ac_vlc_length=
914
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
915
}
916

    
917
static inline void encode_dc(MpegEncContext *s, int diff, int component)
918
{
919
  if(((unsigned) (diff+255)) >= 511){
920
        int index;
921

    
922
        if(diff<0){
923
            index= av_log2_16bit(-2*diff);
924
            diff--;
925
        }else{
926
            index= av_log2_16bit(2*diff);
927
        }
928
        if (component == 0) {
929
            put_bits(
930
                &s->pb,
931
                vlc_dc_lum_bits[index] + index,
932
                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
933
        }else{
934
            put_bits(
935
                &s->pb,
936
                vlc_dc_chroma_bits[index] + index,
937
                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
938
        }
939
  }else{
940
    if (component == 0) {
941
        put_bits(
942
            &s->pb,
943
            mpeg1_lum_dc_uni[diff+255]&0xFF,
944
            mpeg1_lum_dc_uni[diff+255]>>8);
945
    } else {
946
        put_bits(
947
            &s->pb,
948
            mpeg1_chr_dc_uni[diff+255]&0xFF,
949
            mpeg1_chr_dc_uni[diff+255]>>8);
950
    }
951
  }
952
}
953

    
954
static void mpeg1_encode_block(MpegEncContext *s,
955
                               DCTELEM *block,
956
                               int n)
957
{
958
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
959
    int code, component;
960
    const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
961

    
962
    last_index = s->block_last_index[n];
963

    
964
    /* DC coef */
965
    if (s->mb_intra) {
966
        component = (n <= 3 ? 0 : (n&1) + 1);
967
        dc = block[0]; /* overflow is impossible */
968
        diff = dc - s->last_dc[component];
969
        encode_dc(s, diff, component);
970
        s->last_dc[component] = dc;
971
        i = 1;
972
        if (s->intra_vlc_format)
973
            table_vlc = rl_mpeg2.table_vlc;
974
    } else {
975
        /* encode the first coefficient : needs to be done here because
976
           it is handled slightly differently */
977
        level = block[0];
978
        if (abs(level) == 1) {
979
                code = ((uint32_t)level >> 31); /* the sign bit */
980
                put_bits(&s->pb, 2, code | 0x02);
981
                i = 1;
982
        } else {
983
            i = 0;
984
            last_non_zero = -1;
985
            goto next_coef;
986
        }
987
    }
988

    
989
    /* now quantify & encode AC coefs */
990
    last_non_zero = i - 1;
991

    
992
    for(;i<=last_index;i++) {
993
        j = s->intra_scantable.permutated[i];
994
        level = block[j];
995
    next_coef:
996
#if 0
997
        if (level != 0)
998
            dprintf(s->avctx, "level[%d]=%d\n", i, level);
999
#endif
1000
        /* encode using VLC */
1001
        if (level != 0) {
1002
            run = i - last_non_zero - 1;
1003

    
1004
            alevel= level;
1005
            MASK_ABS(sign, alevel)
1006
            sign&=1;
1007

    
1008
            if (alevel <= mpeg1_max_level[0][run]){
1009
                code= mpeg1_index_run[0][run] + alevel - 1;
1010
                /* store the vlc & sign at once */
1011
                put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
1012
            } else {
1013
                /* escape seems to be pretty rare <5% so i dont optimize it */
1014
                put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
1015
                /* escape: only clip in this case */
1016
                put_bits(&s->pb, 6, run);
1017
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
1018
                    if (alevel < 128) {
1019
                        put_bits(&s->pb, 8, level & 0xff);
1020
                    } else {
1021
                        if (level < 0) {
1022
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
1023
                        } else {
1024
                            put_bits(&s->pb, 16, level & 0xffff);
1025
                        }
1026
                    }
1027
                }else{
1028
                    put_bits(&s->pb, 12, level & 0xfff);
1029
                }
1030
            }
1031
            last_non_zero = i;
1032
        }
1033
    }
1034
    /* end of block */
1035
    put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
1036
}
1037
#endif //CONFIG_ENCODERS
1038

    
1039
/******************************************/
1040
/* decoding */
1041

    
1042
static VLC dc_lum_vlc;
1043
static VLC dc_chroma_vlc;
1044
static VLC mv_vlc;
1045
static VLC mbincr_vlc;
1046
static VLC mb_ptype_vlc;
1047
static VLC mb_btype_vlc;
1048
static VLC mb_pat_vlc;
1049

    
1050
static void init_vlcs(void)
1051
{
1052
    static int done = 0;
1053

    
1054
    if (!done) {
1055
        done = 1;
1056

    
1057
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1058
                 vlc_dc_lum_bits, 1, 1,
1059
                 vlc_dc_lum_code, 2, 2, 1);
1060
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1061
                 vlc_dc_chroma_bits, 1, 1,
1062
                 vlc_dc_chroma_code, 2, 2, 1);
1063
        init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1064
                 &mbMotionVectorTable[0][1], 2, 1,
1065
                 &mbMotionVectorTable[0][0], 2, 1, 1);
1066
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1067
                 &mbAddrIncrTable[0][1], 2, 1,
1068
                 &mbAddrIncrTable[0][0], 2, 1, 1);
1069
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1070
                 &mbPatTable[0][1], 2, 1,
1071
                 &mbPatTable[0][0], 2, 1, 1);
1072

    
1073
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1074
                 &table_mb_ptype[0][1], 2, 1,
1075
                 &table_mb_ptype[0][0], 2, 1, 1);
1076
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1077
                 &table_mb_btype[0][1], 2, 1,
1078
                 &table_mb_btype[0][0], 2, 1, 1);
1079
        init_rl(&rl_mpeg1, static_rl_table_store[0]);
1080
        init_rl(&rl_mpeg2, static_rl_table_store[1]);
1081

    
1082
        init_2d_vlc_rl(&rl_mpeg1, 1);
1083
        init_2d_vlc_rl(&rl_mpeg2, 1);
1084
    }
1085
}
1086

    
1087
static inline int get_dmv(MpegEncContext *s)
1088
{
1089
    if(get_bits1(&s->gb))
1090
        return 1 - (get_bits1(&s->gb) << 1);
1091
    else
1092
        return 0;
1093
}
1094

    
1095
static inline int get_qscale(MpegEncContext *s)
1096
{
1097
    int qscale = get_bits(&s->gb, 5);
1098
    if (s->q_scale_type) {
1099
        return non_linear_qscale[qscale];
1100
    } else {
1101
        return qscale << 1;
1102
    }
1103
}
1104

    
1105
/* motion type (for mpeg2) */
1106
#define MT_FIELD 1
1107
#define MT_FRAME 2
1108
#define MT_16X8  2
1109
#define MT_DMV   3
1110

    
1111
static int mpeg_decode_mb(MpegEncContext *s,
1112
                          DCTELEM block[12][64])
1113
{
1114
    int i, j, k, cbp, val, mb_type, motion_type;
1115
    const int mb_block_count = 4 + (1<< s->chroma_format);
1116

    
1117
    dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1118

    
1119
    assert(s->mb_skipped==0);
1120

    
1121
    if (s->mb_skip_run-- != 0) {
1122
        if(s->pict_type == I_TYPE){
1123
            av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1124
            return -1;
1125
        }
1126

    
1127
        /* skip mb */
1128
        s->mb_intra = 0;
1129
        for(i=0;i<12;i++)
1130
            s->block_last_index[i] = -1;
1131
        if(s->picture_structure == PICT_FRAME)
1132
            s->mv_type = MV_TYPE_16X16;
1133
        else
1134
            s->mv_type = MV_TYPE_FIELD;
1135
        if (s->pict_type == P_TYPE) {
1136
            /* if P type, zero motion vector is implied */
1137
            s->mv_dir = MV_DIR_FORWARD;
1138
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1139
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1140
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1141
            s->field_select[0][0]= s->picture_structure - 1;
1142
            s->mb_skipped = 1;
1143
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1144
        } else {
1145
            int mb_type;
1146

    
1147
            if(s->mb_x)
1148
                mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1149
            else
1150
                mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
1151
            if(IS_INTRA(mb_type))
1152
                return -1;
1153

    
1154
            /* if B type, reuse previous vectors and directions */
1155
            s->mv[0][0][0] = s->last_mv[0][0][0];
1156
            s->mv[0][0][1] = s->last_mv[0][0][1];
1157
            s->mv[1][0][0] = s->last_mv[1][0][0];
1158
            s->mv[1][0][1] = s->last_mv[1][0][1];
1159

    
1160
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1161
                mb_type | MB_TYPE_SKIP;
1162
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1163

    
1164
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1165
                s->mb_skipped = 1;
1166
        }
1167

    
1168
        return 0;
1169
    }
1170

    
1171
    switch(s->pict_type) {
1172
    default:
1173
    case I_TYPE:
1174
        if (get_bits1(&s->gb) == 0) {
1175
            if (get_bits1(&s->gb) == 0){
1176
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1177
                return -1;
1178
            }
1179
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1180
        } else {
1181
            mb_type = MB_TYPE_INTRA;
1182
        }
1183
        break;
1184
    case P_TYPE:
1185
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1186
        if (mb_type < 0){
1187
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1188
            return -1;
1189
        }
1190
        mb_type = ptype2mb_type[ mb_type ];
1191
        break;
1192
    case B_TYPE:
1193
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1194
        if (mb_type < 0){
1195
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1196
            return -1;
1197
        }
1198
        mb_type = btype2mb_type[ mb_type ];
1199
        break;
1200
    }
1201
    dprintf(s->avctx, "mb_type=%x\n", mb_type);
1202
//    motion_type = 0; /* avoid warning */
1203
    if (IS_INTRA(mb_type)) {
1204
        s->dsp.clear_blocks(s->block[0]);
1205

    
1206
        if(!s->chroma_y_shift){
1207
            s->dsp.clear_blocks(s->block[6]);
1208
        }
1209

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

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

    
1219
        if (s->concealment_motion_vectors) {
1220
            /* just parse them */
1221
            if (s->picture_structure != PICT_FRAME)
1222
                skip_bits1(&s->gb); /* field select */
1223

    
1224
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1225
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1226
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1227
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1228

    
1229
            skip_bits1(&s->gb); /* marker */
1230
        }else
1231
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1232
        s->mb_intra = 1;
1233
#ifdef HAVE_XVMC
1234
        //one 1 we memcpy blocks in xvmcvideo
1235
        if(s->avctx->xvmc_acceleration > 1){
1236
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1237
            if(s->swap_uv){
1238
                exchange_uv(s);
1239
            }
1240
        }
1241
#endif
1242

    
1243
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1244
            if(s->flags2 & CODEC_FLAG2_FAST){
1245
                for(i=0;i<6;i++) {
1246
                    mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1247
                }
1248
            }else{
1249
                for(i=0;i<mb_block_count;i++) {
1250
                    if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1251
                        return -1;
1252
                }
1253
            }
1254
        } else {
1255
            for(i=0;i<6;i++) {
1256
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1257
                    return -1;
1258
            }
1259
        }
1260
    } else {
1261
        if (mb_type & MB_TYPE_ZERO_MV){
1262
            assert(mb_type & MB_TYPE_CBP);
1263

    
1264
            /* compute dct type */
1265
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1266
                !s->frame_pred_frame_dct) {
1267
                s->interlaced_dct = get_bits1(&s->gb);
1268
            }
1269

    
1270
            if (IS_QUANT(mb_type))
1271
                s->qscale = get_qscale(s);
1272

    
1273
            s->mv_dir = MV_DIR_FORWARD;
1274
            if(s->picture_structure == PICT_FRAME)
1275
                s->mv_type = MV_TYPE_16X16;
1276
            else{
1277
                s->mv_type = MV_TYPE_FIELD;
1278
                mb_type |= MB_TYPE_INTERLACED;
1279
                s->field_select[0][0]= s->picture_structure - 1;
1280
            }
1281
            s->last_mv[0][0][0] = 0;
1282
            s->last_mv[0][0][1] = 0;
1283
            s->last_mv[0][1][0] = 0;
1284
            s->last_mv[0][1][1] = 0;
1285
            s->mv[0][0][0] = 0;
1286
            s->mv[0][0][1] = 0;
1287
        }else{
1288
            assert(mb_type & MB_TYPE_L0L1);
1289
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1290
            /* get additional motion vector type */
1291
            if (s->frame_pred_frame_dct)
1292
                motion_type = MT_FRAME;
1293
            else{
1294
                motion_type = get_bits(&s->gb, 2);
1295
            }
1296

    
1297
            /* compute dct type */
1298
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1299
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1300
                s->interlaced_dct = get_bits1(&s->gb);
1301
            }
1302

    
1303
            if (IS_QUANT(mb_type))
1304
                s->qscale = get_qscale(s);
1305

    
1306
            /* motion vectors */
1307
            s->mv_dir = 0;
1308
            for(i=0;i<2;i++) {
1309
                if (USES_LIST(mb_type, i)) {
1310
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1311
                    dprintf(s->avctx, "motion_type=%d\n", motion_type);
1312
                    switch(motion_type) {
1313
                    case MT_FRAME: /* or MT_16X8 */
1314
                        if (s->picture_structure == PICT_FRAME) {
1315
                            /* MT_FRAME */
1316
                            mb_type |= MB_TYPE_16x16;
1317
                            s->mv_type = MV_TYPE_16X16;
1318
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1319
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1320
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1321
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1322
                            /* full_pel: only for mpeg1 */
1323
                            if (s->full_pel[i]){
1324
                                s->mv[i][0][0] <<= 1;
1325
                                s->mv[i][0][1] <<= 1;
1326
                            }
1327
                        } else {
1328
                            /* MT_16X8 */
1329
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1330
                            s->mv_type = MV_TYPE_16X8;
1331
                            for(j=0;j<2;j++) {
1332
                                s->field_select[i][j] = get_bits1(&s->gb);
1333
                                for(k=0;k<2;k++) {
1334
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1335
                                                             s->last_mv[i][j][k]);
1336
                                    s->last_mv[i][j][k] = val;
1337
                                    s->mv[i][j][k] = val;
1338
                                }
1339
                            }
1340
                        }
1341
                        break;
1342
                    case MT_FIELD:
1343
                        s->mv_type = MV_TYPE_FIELD;
1344
                        if (s->picture_structure == PICT_FRAME) {
1345
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1346
                            for(j=0;j<2;j++) {
1347
                                s->field_select[i][j] = get_bits1(&s->gb);
1348
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1349
                                                         s->last_mv[i][j][0]);
1350
                                s->last_mv[i][j][0] = val;
1351
                                s->mv[i][j][0] = val;
1352
                                dprintf(s->avctx, "fmx=%d\n", val);
1353
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1354
                                                         s->last_mv[i][j][1] >> 1);
1355
                                s->last_mv[i][j][1] = val << 1;
1356
                                s->mv[i][j][1] = val;
1357
                                dprintf(s->avctx, "fmy=%d\n", val);
1358
                            }
1359
                        } else {
1360
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1361
                            s->field_select[i][0] = get_bits1(&s->gb);
1362
                            for(k=0;k<2;k++) {
1363
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1364
                                                         s->last_mv[i][0][k]);
1365
                                s->last_mv[i][0][k] = val;
1366
                                s->last_mv[i][1][k] = val;
1367
                                s->mv[i][0][k] = val;
1368
                            }
1369
                        }
1370
                        break;
1371
                    case MT_DMV:
1372
                        {
1373
                            int dmx, dmy, mx, my, m;
1374

    
1375
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1376
                                                    s->last_mv[i][0][0]);
1377
                            s->last_mv[i][0][0] = mx;
1378
                            s->last_mv[i][1][0] = mx;
1379
                            dmx = get_dmv(s);
1380
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1381
                                                    s->last_mv[i][0][1] >> 1);
1382
                            dmy = get_dmv(s);
1383
                            s->mv_type = MV_TYPE_DMV;
1384

    
1385

    
1386
                            s->last_mv[i][0][1] = my<<1;
1387
                            s->last_mv[i][1][1] = my<<1;
1388

    
1389
                            s->mv[i][0][0] = mx;
1390
                            s->mv[i][0][1] = my;
1391
                            s->mv[i][1][0] = mx;//not used
1392
                            s->mv[i][1][1] = my;//not used
1393

    
1394
                            if (s->picture_structure == PICT_FRAME) {
1395
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1396

    
1397
                                //m = 1 + 2 * s->top_field_first;
1398
                                m = s->top_field_first ? 1 : 3;
1399

    
1400
                                /* top -> top pred */
1401
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1402
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1403
                                m = 4 - m;
1404
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1405
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1406
                            } else {
1407
                                mb_type |= MB_TYPE_16x16;
1408

    
1409
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1410
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1411
                                if(s->picture_structure == PICT_TOP_FIELD)
1412
                                    s->mv[i][2][1]--;
1413
                                else
1414
                                    s->mv[i][2][1]++;
1415
                            }
1416
                        }
1417
                        break;
1418
                    default:
1419
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1420
                        return -1;
1421
                    }
1422
                }
1423
            }
1424
        }
1425

    
1426
        s->mb_intra = 0;
1427
        if (HAS_CBP(mb_type)) {
1428
            s->dsp.clear_blocks(s->block[0]);
1429

    
1430
            if(!s->chroma_y_shift){
1431
                s->dsp.clear_blocks(s->block[6]);
1432
            }
1433

    
1434
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1435
            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1436
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1437
                return -1;
1438
            }
1439
            if(mb_block_count > 6){
1440
                 cbp<<= mb_block_count-6;
1441
                 cbp |= get_bits(&s->gb, mb_block_count-6);
1442
            }
1443

    
1444
#ifdef HAVE_XVMC
1445
            //on 1 we memcpy blocks in xvmcvideo
1446
            if(s->avctx->xvmc_acceleration > 1){
1447
                XVMC_pack_pblocks(s,cbp);
1448
                if(s->swap_uv){
1449
                    exchange_uv(s);
1450
                }
1451
            }
1452
#endif
1453

    
1454
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1455
                if(s->flags2 & CODEC_FLAG2_FAST){
1456
                    for(i=0;i<6;i++) {
1457
                        if(cbp & 32) {
1458
                            mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1459
                        } else {
1460
                            s->block_last_index[i] = -1;
1461
                        }
1462
                        cbp+=cbp;
1463
                    }
1464
                }else{
1465
                    cbp<<= 12-mb_block_count;
1466

    
1467
                    for(i=0;i<mb_block_count;i++) {
1468
                        if ( cbp & (1<<11) ) {
1469
                            if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1470
                                return -1;
1471
                        } else {
1472
                            s->block_last_index[i] = -1;
1473
                        }
1474
                        cbp+=cbp;
1475
                    }
1476
                }
1477
            } else {
1478
                if(s->flags2 & CODEC_FLAG2_FAST){
1479
                    for(i=0;i<6;i++) {
1480
                        if (cbp & 32) {
1481
                            mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1482
                        } else {
1483
                            s->block_last_index[i] = -1;
1484
                        }
1485
                        cbp+=cbp;
1486
                    }
1487
                }else{
1488
                    for(i=0;i<6;i++) {
1489
                        if (cbp & 32) {
1490
                            if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1491
                                return -1;
1492
                        } else {
1493
                            s->block_last_index[i] = -1;
1494
                        }
1495
                        cbp+=cbp;
1496
                    }
1497
                }
1498
            }
1499
        }else{
1500
            for(i=0;i<12;i++)
1501
                s->block_last_index[i] = -1;
1502
        }
1503
    }
1504

    
1505
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1506

    
1507
    return 0;
1508
}
1509

    
1510
/* as h263, but only 17 codes */
1511
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1512
{
1513
    int code, sign, val, l, shift;
1514

    
1515
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1516
    if (code == 0) {
1517
        return pred;
1518
    }
1519
    if (code < 0) {
1520
        return 0xffff;
1521
    }
1522

    
1523
    sign = get_bits1(&s->gb);
1524
    shift = fcode - 1;
1525
    val = code;
1526
    if (shift) {
1527
        val = (val - 1) << shift;
1528
        val |= get_bits(&s->gb, shift);
1529
        val++;
1530
    }
1531
    if (sign)
1532
        val = -val;
1533
    val += pred;
1534

    
1535
    /* modulo decoding */
1536
    l= INT_BIT - 5 - shift;
1537
    val = (val<<l)>>l;
1538
    return val;
1539
}
1540

    
1541
static inline int decode_dc(GetBitContext *gb, int component)
1542
{
1543
    int code, diff;
1544

    
1545
    if (component == 0) {
1546
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1547
    } else {
1548
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1549
    }
1550
    if (code < 0){
1551
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1552
        return 0xffff;
1553
    }
1554
    if (code == 0) {
1555
        diff = 0;
1556
    } else {
1557
        diff = get_xbits(gb, code);
1558
    }
1559
    return diff;
1560
}
1561

    
1562
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1563
                               DCTELEM *block,
1564
                               int n)
1565
{
1566
    int level, dc, diff, i, j, run;
1567
    int component;
1568
    RLTable *rl = &rl_mpeg1;
1569
    uint8_t * const scantable= s->intra_scantable.permutated;
1570
    const uint16_t *quant_matrix= s->intra_matrix;
1571
    const int qscale= s->qscale;
1572

    
1573
    /* DC coef */
1574
    component = (n <= 3 ? 0 : n - 4 + 1);
1575
    diff = decode_dc(&s->gb, component);
1576
    if (diff >= 0xffff)
1577
        return -1;
1578
    dc = s->last_dc[component];
1579
    dc += diff;
1580
    s->last_dc[component] = dc;
1581
    block[0] = dc<<3;
1582
    dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
1583
    i = 0;
1584
    {
1585
        OPEN_READER(re, &s->gb);
1586
        /* now quantify & encode AC coefs */
1587
        for(;;) {
1588
            UPDATE_CACHE(re, &s->gb);
1589
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1590

    
1591
            if(level == 127){
1592
                break;
1593
            } else if(level != 0) {
1594
                i += run;
1595
                j = scantable[i];
1596
                level= (level*qscale*quant_matrix[j])>>4;
1597
                level= (level-1)|1;
1598
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1599
                LAST_SKIP_BITS(re, &s->gb, 1);
1600
            } else {
1601
                /* escape */
1602
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1603
                UPDATE_CACHE(re, &s->gb);
1604
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1605
                if (level == -128) {
1606
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1607
                } else if (level == 0) {
1608
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1609
                }
1610
                i += run;
1611
                j = scantable[i];
1612
                if(level<0){
1613
                    level= -level;
1614
                    level= (level*qscale*quant_matrix[j])>>4;
1615
                    level= (level-1)|1;
1616
                    level= -level;
1617
                }else{
1618
                    level= (level*qscale*quant_matrix[j])>>4;
1619
                    level= (level-1)|1;
1620
                }
1621
            }
1622
            if (i > 63){
1623
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1624
                return -1;
1625
            }
1626

    
1627
            block[j] = level;
1628
        }
1629
        CLOSE_READER(re, &s->gb);
1630
    }
1631
    s->block_last_index[n] = i;
1632
   return 0;
1633
}
1634

    
1635
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1636
                               DCTELEM *block,
1637
                               int n)
1638
{
1639
    int level, i, j, run;
1640
    RLTable *rl = &rl_mpeg1;
1641
    uint8_t * const scantable= s->intra_scantable.permutated;
1642
    const uint16_t *quant_matrix= s->inter_matrix;
1643
    const int qscale= s->qscale;
1644

    
1645
    {
1646
        OPEN_READER(re, &s->gb);
1647
        i = -1;
1648
        /* special case for the first coef. no need to add a second vlc table */
1649
        UPDATE_CACHE(re, &s->gb);
1650
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1651
            level= (3*qscale*quant_matrix[0])>>5;
1652
            level= (level-1)|1;
1653
            if(GET_CACHE(re, &s->gb)&0x40000000)
1654
                level= -level;
1655
            block[0] = level;
1656
            i++;
1657
            SKIP_BITS(re, &s->gb, 2);
1658
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1659
                goto end;
1660
        }
1661

    
1662
        /* now quantify & encode AC coefs */
1663
        for(;;) {
1664
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1665

    
1666
            if(level != 0) {
1667
                i += run;
1668
                j = scantable[i];
1669
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1670
                level= (level-1)|1;
1671
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1672
                SKIP_BITS(re, &s->gb, 1);
1673
            } else {
1674
                /* escape */
1675
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1676
                UPDATE_CACHE(re, &s->gb);
1677
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1678
                if (level == -128) {
1679
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1680
                } else if (level == 0) {
1681
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1682
                }
1683
                i += run;
1684
                j = scantable[i];
1685
                if(level<0){
1686
                    level= -level;
1687
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1688
                    level= (level-1)|1;
1689
                    level= -level;
1690
                }else{
1691
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1692
                    level= (level-1)|1;
1693
                }
1694
            }
1695
            if (i > 63){
1696
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1697
                return -1;
1698
            }
1699

    
1700
            block[j] = level;
1701
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1702
                break;
1703
            UPDATE_CACHE(re, &s->gb);
1704
        }
1705
end:
1706
        LAST_SKIP_BITS(re, &s->gb, 2);
1707
        CLOSE_READER(re, &s->gb);
1708
    }
1709
    s->block_last_index[n] = i;
1710
    return 0;
1711
}
1712

    
1713
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1714
{
1715
    int level, i, j, run;
1716
    RLTable *rl = &rl_mpeg1;
1717
    uint8_t * const scantable= s->intra_scantable.permutated;
1718
    const int qscale= s->qscale;
1719

    
1720
    {
1721
        OPEN_READER(re, &s->gb);
1722
        i = -1;
1723
        /* special case for the first coef. no need to add a second vlc table */
1724
        UPDATE_CACHE(re, &s->gb);
1725
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1726
            level= (3*qscale)>>1;
1727
            level= (level-1)|1;
1728
            if(GET_CACHE(re, &s->gb)&0x40000000)
1729
                level= -level;
1730
            block[0] = level;
1731
            i++;
1732
            SKIP_BITS(re, &s->gb, 2);
1733
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1734
                goto end;
1735
        }
1736

    
1737
        /* now quantify & encode AC coefs */
1738
        for(;;) {
1739
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1740

    
1741
            if(level != 0) {
1742
                i += run;
1743
                j = scantable[i];
1744
                level= ((level*2+1)*qscale)>>1;
1745
                level= (level-1)|1;
1746
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1747
                SKIP_BITS(re, &s->gb, 1);
1748
            } else {
1749
                /* escape */
1750
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1751
                UPDATE_CACHE(re, &s->gb);
1752
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1753
                if (level == -128) {
1754
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1755
                } else if (level == 0) {
1756
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1757
                }
1758
                i += run;
1759
                j = scantable[i];
1760
                if(level<0){
1761
                    level= -level;
1762
                    level= ((level*2+1)*qscale)>>1;
1763
                    level= (level-1)|1;
1764
                    level= -level;
1765
                }else{
1766
                    level= ((level*2+1)*qscale)>>1;
1767
                    level= (level-1)|1;
1768
                }
1769
            }
1770

    
1771
            block[j] = level;
1772
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1773
                break;
1774
            UPDATE_CACHE(re, &s->gb);
1775
        }
1776
end:
1777
        LAST_SKIP_BITS(re, &s->gb, 2);
1778
        CLOSE_READER(re, &s->gb);
1779
    }
1780
    s->block_last_index[n] = i;
1781
    return 0;
1782
}
1783

    
1784

    
1785
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1786
                               DCTELEM *block,
1787
                               int n)
1788
{
1789
    int level, i, j, run;
1790
    RLTable *rl = &rl_mpeg1;
1791
    uint8_t * const scantable= s->intra_scantable.permutated;
1792
    const uint16_t *quant_matrix;
1793
    const int qscale= s->qscale;
1794
    int mismatch;
1795

    
1796
    mismatch = 1;
1797

    
1798
    {
1799
        OPEN_READER(re, &s->gb);
1800
        i = -1;
1801
        if (n < 4)
1802
            quant_matrix = s->inter_matrix;
1803
        else
1804
            quant_matrix = s->chroma_inter_matrix;
1805

    
1806
        /* special case for the first coef. no need to add a second vlc table */
1807
        UPDATE_CACHE(re, &s->gb);
1808
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1809
            level= (3*qscale*quant_matrix[0])>>5;
1810
            if(GET_CACHE(re, &s->gb)&0x40000000)
1811
                level= -level;
1812
            block[0] = level;
1813
            mismatch ^= level;
1814
            i++;
1815
            SKIP_BITS(re, &s->gb, 2);
1816
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1817
                goto end;
1818
        }
1819

    
1820
        /* now quantify & encode AC coefs */
1821
        for(;;) {
1822
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1823

    
1824
            if(level != 0) {
1825
                i += run;
1826
                j = scantable[i];
1827
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1828
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1829
                SKIP_BITS(re, &s->gb, 1);
1830
            } else {
1831
                /* escape */
1832
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1833
                UPDATE_CACHE(re, &s->gb);
1834
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1835

    
1836
                i += run;
1837
                j = scantable[i];
1838
                if(level<0){
1839
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1840
                    level= -level;
1841
                }else{
1842
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1843
                }
1844
            }
1845
            if (i > 63){
1846
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1847
                return -1;
1848
            }
1849

    
1850
            mismatch ^= level;
1851
            block[j] = level;
1852
            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1853
                break;
1854
            UPDATE_CACHE(re, &s->gb);
1855
        }
1856
end:
1857
        LAST_SKIP_BITS(re, &s->gb, 2);
1858
        CLOSE_READER(re, &s->gb);
1859
    }
1860
    block[63] ^= (mismatch & 1);
1861

    
1862
    s->block_last_index[n] = i;
1863
    return 0;
1864
}
1865

    
1866
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1867
                               DCTELEM *block,
1868
                               int n)
1869
{
1870
    int level, i, j, run;
1871
    RLTable *rl = &rl_mpeg1;
1872
    uint8_t * const scantable= s->intra_scantable.permutated;
1873
    const int qscale= s->qscale;
1874
    OPEN_READER(re, &s->gb);
1875
    i = -1;
1876

    
1877
    /* special case for the first coef. no need to add a second vlc table */
1878
    UPDATE_CACHE(re, &s->gb);
1879
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1880
        level= (3*qscale)>>1;
1881
        if(GET_CACHE(re, &s->gb)&0x40000000)
1882
            level= -level;
1883
        block[0] = level;
1884
        i++;
1885
        SKIP_BITS(re, &s->gb, 2);
1886
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1887
            goto end;
1888
    }
1889

    
1890
    /* now quantify & encode AC coefs */
1891
    for(;;) {
1892
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1893

    
1894
        if(level != 0) {
1895
            i += run;
1896
            j = scantable[i];
1897
            level= ((level*2+1)*qscale)>>1;
1898
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1899
            SKIP_BITS(re, &s->gb, 1);
1900
        } else {
1901
            /* escape */
1902
            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1903
            UPDATE_CACHE(re, &s->gb);
1904
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1905

    
1906
            i += run;
1907
            j = scantable[i];
1908
            if(level<0){
1909
                level= ((-level*2+1)*qscale)>>1;
1910
                level= -level;
1911
            }else{
1912
                level= ((level*2+1)*qscale)>>1;
1913
            }
1914
        }
1915

    
1916
        block[j] = level;
1917
        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1918
            break;
1919
        UPDATE_CACHE(re, &s->gb);
1920
    }
1921
end:
1922
    LAST_SKIP_BITS(re, &s->gb, 2);
1923
    CLOSE_READER(re, &s->gb);
1924
    s->block_last_index[n] = i;
1925
    return 0;
1926
}
1927

    
1928

    
1929
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1930
                               DCTELEM *block,
1931
                               int n)
1932
{
1933
    int level, dc, diff, i, j, run;
1934
    int component;
1935
    RLTable *rl;
1936
    uint8_t * const scantable= s->intra_scantable.permutated;
1937
    const uint16_t *quant_matrix;
1938
    const int qscale= s->qscale;
1939
    int mismatch;
1940

    
1941
    /* DC coef */
1942
    if (n < 4){
1943
        quant_matrix = s->intra_matrix;
1944
        component = 0;
1945
    }else{
1946
        quant_matrix = s->chroma_intra_matrix;
1947
        component = (n&1) + 1;
1948
    }
1949
    diff = decode_dc(&s->gb, component);
1950
    if (diff >= 0xffff)
1951
        return -1;
1952
    dc = s->last_dc[component];
1953
    dc += diff;
1954
    s->last_dc[component] = dc;
1955
    block[0] = dc << (3 - s->intra_dc_precision);
1956
    dprintf(s->avctx, "dc=%d\n", block[0]);
1957
    mismatch = block[0] ^ 1;
1958
    i = 0;
1959
    if (s->intra_vlc_format)
1960
        rl = &rl_mpeg2;
1961
    else
1962
        rl = &rl_mpeg1;
1963

    
1964
    {
1965
        OPEN_READER(re, &s->gb);
1966
        /* now quantify & encode AC coefs */
1967
        for(;;) {
1968
            UPDATE_CACHE(re, &s->gb);
1969
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1970

    
1971
            if(level == 127){
1972
                break;
1973
            } else if(level != 0) {
1974
                i += run;
1975
                j = scantable[i];
1976
                level= (level*qscale*quant_matrix[j])>>4;
1977
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1978
                LAST_SKIP_BITS(re, &s->gb, 1);
1979
            } else {
1980
                /* escape */
1981
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1982
                UPDATE_CACHE(re, &s->gb);
1983
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1984
                i += run;
1985
                j = scantable[i];
1986
                if(level<0){
1987
                    level= (-level*qscale*quant_matrix[j])>>4;
1988
                    level= -level;
1989
                }else{
1990
                    level= (level*qscale*quant_matrix[j])>>4;
1991
                }
1992
            }
1993
            if (i > 63){
1994
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1995
                return -1;
1996
            }
1997

    
1998
            mismatch^= level;
1999
            block[j] = level;
2000
        }
2001
        CLOSE_READER(re, &s->gb);
2002
    }
2003
    block[63]^= mismatch&1;
2004

    
2005
    s->block_last_index[n] = i;
2006
    return 0;
2007
}
2008

    
2009
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
2010
                               DCTELEM *block,
2011
                               int n)
2012
{
2013
    int level, dc, diff, j, run;
2014
    int component;
2015
    RLTable *rl;
2016
    uint8_t * scantable= s->intra_scantable.permutated;
2017
    const uint16_t *quant_matrix;
2018
    const int qscale= s->qscale;
2019

    
2020
    /* DC coef */
2021
    if (n < 4){
2022
        quant_matrix = s->intra_matrix;
2023
        component = 0;
2024
    }else{
2025
        quant_matrix = s->chroma_intra_matrix;
2026
        component = (n&1) + 1;
2027
    }
2028
    diff = decode_dc(&s->gb, component);
2029
    if (diff >= 0xffff)
2030
        return -1;
2031
    dc = s->last_dc[component];
2032
    dc += diff;
2033
    s->last_dc[component] = dc;
2034
    block[0] = dc << (3 - s->intra_dc_precision);
2035
    if (s->intra_vlc_format)
2036
        rl = &rl_mpeg2;
2037
    else
2038
        rl = &rl_mpeg1;
2039

    
2040
    {
2041
        OPEN_READER(re, &s->gb);
2042
        /* now quantify & encode AC coefs */
2043
        for(;;) {
2044
            UPDATE_CACHE(re, &s->gb);
2045
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2046

    
2047
            if(level == 127){
2048
                break;
2049
            } else if(level != 0) {
2050
                scantable += run;
2051
                j = *scantable;
2052
                level= (level*qscale*quant_matrix[j])>>4;
2053
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2054
                LAST_SKIP_BITS(re, &s->gb, 1);
2055
            } else {
2056
                /* escape */
2057
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2058
                UPDATE_CACHE(re, &s->gb);
2059
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2060
                scantable += run;
2061
                j = *scantable;
2062
                if(level<0){
2063
                    level= (-level*qscale*quant_matrix[j])>>4;
2064
                    level= -level;
2065
                }else{
2066
                    level= (level*qscale*quant_matrix[j])>>4;
2067
                }
2068
            }
2069

    
2070
            block[j] = level;
2071
        }
2072
        CLOSE_READER(re, &s->gb);
2073
    }
2074

    
2075
    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2076
    return 0;
2077
}
2078

    
2079
typedef struct Mpeg1Context {
2080
    MpegEncContext mpeg_enc_ctx;
2081
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2082
    int repeat_field; /* true if we must repeat the field */
2083
    AVPanScan pan_scan; /** some temporary storage for the panscan */
2084
    int slice_count;
2085
    int swap_uv;//indicate VCR2
2086
    int save_aspect_info;
2087
    int save_width, save_height;
2088
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2089

    
2090
} Mpeg1Context;
2091

    
2092
static int mpeg_decode_init(AVCodecContext *avctx)
2093
{
2094
    Mpeg1Context *s = avctx->priv_data;
2095
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2096
    int i;
2097

    
2098
    //we need some parmutation to store
2099
    //matrixes, until MPV_common_init()
2100
    //set the real permutatuon
2101
    for(i=0;i<64;i++)
2102
       s2->dsp.idct_permutation[i]=i;
2103

    
2104
    MPV_decode_defaults(s2);
2105

    
2106
    s->mpeg_enc_ctx.avctx= avctx;
2107
    s->mpeg_enc_ctx.flags= avctx->flags;
2108
    s->mpeg_enc_ctx.flags2= avctx->flags2;
2109
    common_init(&s->mpeg_enc_ctx);
2110
    init_vlcs();
2111

    
2112
    s->mpeg_enc_ctx_allocated = 0;
2113
    s->mpeg_enc_ctx.picture_number = 0;
2114
    s->repeat_field = 0;
2115
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2116
    return 0;
2117
}
2118

    
2119
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2120
                                     const uint8_t *new_perm){
2121
    uint16_t temp_matrix[64];
2122
    int i;
2123

    
2124
    memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2125

    
2126
    for(i=0;i<64;i++){
2127
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2128
    }
2129
}
2130

    
2131
//Call this function when we know all parameters
2132
//it may be called in different places for mpeg1 and mpeg2
2133
static int mpeg_decode_postinit(AVCodecContext *avctx){
2134
    Mpeg1Context *s1 = avctx->priv_data;
2135
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2136
    uint8_t old_permutation[64];
2137

    
2138
    if (
2139
        (s1->mpeg_enc_ctx_allocated == 0)||
2140
        avctx->coded_width  != s->width ||
2141
        avctx->coded_height != s->height||
2142
        s1->save_width != s->width ||
2143
        s1->save_height != s->height ||
2144
        s1->save_aspect_info != s->aspect_ratio_info||
2145
        0)
2146
    {
2147

    
2148
        if (s1->mpeg_enc_ctx_allocated) {
2149
            ParseContext pc= s->parse_context;
2150
            s->parse_context.buffer=0;
2151
            MPV_common_end(s);
2152
            s->parse_context= pc;
2153
        }
2154

    
2155
        if( (s->width == 0 )||(s->height == 0))
2156
            return -2;
2157

    
2158
        avcodec_set_dimensions(avctx, s->width, s->height);
2159
        avctx->bit_rate = s->bit_rate;
2160
        s1->save_aspect_info = s->aspect_ratio_info;
2161
        s1->save_width = s->width;
2162
        s1->save_height = s->height;
2163

    
2164
     //low_delay may be forced, in this case we will have B frames
2165
     //that behave like P frames
2166
        avctx->has_b_frames = !(s->low_delay);
2167

    
2168
        if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2169
            //mpeg1 fps
2170
            avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2171
            avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2172
            //mpeg1 aspect
2173
            avctx->sample_aspect_ratio= av_d2q(
2174
                    1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2175

    
2176
        }else{//mpeg2
2177
        //mpeg2 fps
2178
            av_reduce(
2179
                &s->avctx->time_base.den,
2180
                &s->avctx->time_base.num,
2181
                ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2182
                ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2183
                1<<30);
2184
        //mpeg2 aspect
2185
            if(s->aspect_ratio_info > 1){
2186
                if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2187
                    s->avctx->sample_aspect_ratio=
2188
                        av_div_q(
2189
                         mpeg2_aspect[s->aspect_ratio_info],
2190
                         (AVRational){s->width, s->height}
2191
                         );
2192
                }else{
2193
                    s->avctx->sample_aspect_ratio=
2194
                        av_div_q(
2195
                         mpeg2_aspect[s->aspect_ratio_info],
2196
                         (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2197
                        );
2198
                }
2199
            }else{
2200
                s->avctx->sample_aspect_ratio=
2201
                    mpeg2_aspect[s->aspect_ratio_info];
2202
            }
2203
        }//mpeg2
2204

    
2205
        if(avctx->xvmc_acceleration){
2206
            avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2207
        }else{
2208
            if(s->chroma_format <  2){
2209
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2210
            }else
2211
            if(s->chroma_format == 2){
2212
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2213
            }else
2214
            if(s->chroma_format >  2){
2215
                avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2216
            }
2217
        }
2218
        //until then pix_fmt may be changed right after codec init
2219
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2220
            if( avctx->idct_algo == FF_IDCT_AUTO )
2221
                avctx->idct_algo = FF_IDCT_SIMPLE;
2222

    
2223
        //quantization matrixes may need reordering
2224
        //if dct permutation is changed
2225
        memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2226

    
2227
        if (MPV_common_init(s) < 0)
2228
            return -2;
2229

    
2230
        quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2231
        quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2232
        quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2233
        quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2234

    
2235
        s1->mpeg_enc_ctx_allocated = 1;
2236
    }
2237
    return 0;
2238
}
2239

    
2240
static int mpeg1_decode_picture(AVCodecContext *avctx,
2241
                                const uint8_t *buf, int buf_size)
2242
{
2243
    Mpeg1Context *s1 = avctx->priv_data;
2244
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2245
    int ref, f_code, vbv_delay;
2246

    
2247
    if(mpeg_decode_postinit(s->avctx) < 0)
2248
       return -2;
2249

    
2250
    init_get_bits(&s->gb, buf, buf_size*8);
2251

    
2252
    ref = get_bits(&s->gb, 10); /* temporal ref */
2253
    s->pict_type = get_bits(&s->gb, 3);
2254
    if(s->pict_type == 0 || s->pict_type > 3)
2255
        return -1;
2256

    
2257
    vbv_delay= get_bits(&s->gb, 16);
2258
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2259
        s->full_pel[0] = get_bits1(&s->gb);
2260
        f_code = get_bits(&s->gb, 3);
2261
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2262
            return -1;
2263
        s->mpeg_f_code[0][0] = f_code;
2264
        s->mpeg_f_code[0][1] = f_code;
2265
    }
2266
    if (s->pict_type == B_TYPE) {
2267
        s->full_pel[1] = get_bits1(&s->gb);
2268
        f_code = get_bits(&s->gb, 3);
2269
        if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2270
            return -1;
2271
        s->mpeg_f_code[1][0] = f_code;
2272
        s->mpeg_f_code[1][1] = f_code;
2273
    }
2274
    s->current_picture.pict_type= s->pict_type;
2275
    s->current_picture.key_frame= s->pict_type == I_TYPE;
2276

    
2277
    if(avctx->debug & FF_DEBUG_PICT_INFO)
2278
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2279

    
2280
    s->y_dc_scale = 8;
2281
    s->c_dc_scale = 8;
2282
    s->first_slice = 1;
2283
    return 0;
2284
}
2285

    
2286
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2287
{
2288
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2289
    int horiz_size_ext, vert_size_ext;
2290
    int bit_rate_ext;
2291

    
2292
    skip_bits(&s->gb, 1); /* profil and level esc*/
2293
    s->avctx->profile= get_bits(&s->gb, 3);
2294
    s->avctx->level= get_bits(&s->gb, 4);
2295
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2296
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2297
    horiz_size_ext = get_bits(&s->gb, 2);
2298
    vert_size_ext = get_bits(&s->gb, 2);
2299
    s->width |= (horiz_size_ext << 12);
2300
    s->height |= (vert_size_ext << 12);
2301
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2302
    s->bit_rate += (bit_rate_ext << 18) * 400;
2303
    skip_bits1(&s->gb); /* marker */
2304
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2305

    
2306
    s->low_delay = get_bits1(&s->gb);
2307
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2308

    
2309
    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2310
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2311

    
2312
    dprintf(s->avctx, "sequence extension\n");
2313
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2314
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
2315

    
2316
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2317
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2318
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2319

    
2320
}
2321

    
2322
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2323
{
2324
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2325
    int color_description, w, h;
2326

    
2327
    skip_bits(&s->gb, 3); /* video format */
2328
    color_description= get_bits1(&s->gb);
2329
    if(color_description){
2330
        skip_bits(&s->gb, 8); /* color primaries */
2331
        skip_bits(&s->gb, 8); /* transfer_characteristics */
2332
        skip_bits(&s->gb, 8); /* matrix_coefficients */
2333
    }
2334
    w= get_bits(&s->gb, 14);
2335
    skip_bits(&s->gb, 1); //marker
2336
    h= get_bits(&s->gb, 14);
2337
    skip_bits(&s->gb, 1); //marker
2338

    
2339
    s1->pan_scan.width= 16*w;
2340
    s1->pan_scan.height=16*h;
2341

    
2342
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2343
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2344
}
2345

    
2346
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2347
{
2348
    MpegEncContext *s= &s1->mpeg_enc_ctx;
2349
    int i,nofco;
2350

    
2351
    nofco = 1;
2352
    if(s->progressive_sequence){
2353
        if(s->repeat_first_field){
2354
            nofco++;
2355
            if(s->top_field_first)
2356
                nofco++;
2357
        }
2358
    }else{
2359
        if(s->picture_structure == PICT_FRAME){
2360
            nofco++;
2361
            if(s->repeat_first_field)
2362
                nofco++;
2363
        }
2364
    }
2365
    for(i=0; i<nofco; i++){
2366
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2367
        skip_bits(&s->gb, 1); //marker
2368
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2369
        skip_bits(&s->gb, 1); //marker
2370
    }
2371

    
2372
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2373
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2374
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2375
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2376
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2377
        );
2378
}
2379

    
2380
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2381
{
2382
    int i, v, j;
2383

    
2384
    dprintf(s->avctx, "matrix extension\n");
2385

    
2386
    if (get_bits1(&s->gb)) {
2387
        for(i=0;i<64;i++) {
2388
            v = get_bits(&s->gb, 8);
2389
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2390
            s->intra_matrix[j] = v;
2391
            s->chroma_intra_matrix[j] = v;
2392
        }
2393
    }
2394
    if (get_bits1(&s->gb)) {
2395
        for(i=0;i<64;i++) {
2396
            v = get_bits(&s->gb, 8);
2397
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2398
            s->inter_matrix[j] = v;
2399
            s->chroma_inter_matrix[j] = v;
2400
        }
2401
    }
2402
    if (get_bits1(&s->gb)) {
2403
        for(i=0;i<64;i++) {
2404
            v = get_bits(&s->gb, 8);
2405
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2406
            s->chroma_intra_matrix[j] = v;
2407
        }
2408
    }
2409
    if (get_bits1(&s->gb)) {
2410
        for(i=0;i<64;i++) {
2411
            v = get_bits(&s->gb, 8);
2412
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2413
            s->chroma_inter_matrix[j] = v;
2414
        }
2415
    }
2416
}
2417

    
2418
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2419
{
2420
    s->full_pel[0] = s->full_pel[1] = 0;
2421
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2422
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2423
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2424
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2425
    s->intra_dc_precision = get_bits(&s->gb, 2);
2426
    s->picture_structure = get_bits(&s->gb, 2);
2427
    s->top_field_first = get_bits1(&s->gb);
2428
    s->frame_pred_frame_dct = get_bits1(&s->gb);
2429
    s->concealment_motion_vectors = get_bits1(&s->gb);
2430
    s->q_scale_type = get_bits1(&s->gb);
2431
    s->intra_vlc_format = get_bits1(&s->gb);
2432
    s->alternate_scan = get_bits1(&s->gb);
2433
    s->repeat_first_field = get_bits1(&s->gb);
2434
    s->chroma_420_type = get_bits1(&s->gb);
2435
    s->progressive_frame = get_bits1(&s->gb);
2436

    
2437
    if(s->picture_structure == PICT_FRAME){
2438
        s->first_field=0;
2439
        s->v_edge_pos= 16*s->mb_height;
2440
    }else{
2441
        s->first_field ^= 1;
2442
        s->v_edge_pos=  8*s->mb_height;
2443
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2444
    }
2445

    
2446
    if(s->alternate_scan){
2447
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2448
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2449
    }else{
2450
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2451
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2452
    }
2453

    
2454
    /* composite display not parsed */
2455
    dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
2456
    dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
2457
    dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
2458
    dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
2459
    dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
2460
    dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
2461
    dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
2462
    dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2463
    dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
2464
}
2465

    
2466
static void mpeg_decode_extension(AVCodecContext *avctx,
2467
                                  const uint8_t *buf, int buf_size)
2468
{
2469
    Mpeg1Context *s1 = avctx->priv_data;
2470
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2471
    int ext_type;
2472

    
2473
    init_get_bits(&s->gb, buf, buf_size*8);
2474

    
2475
    ext_type = get_bits(&s->gb, 4);
2476
    switch(ext_type) {
2477
    case 0x1:
2478
        mpeg_decode_sequence_extension(s1);
2479
        break;
2480
    case 0x2:
2481
        mpeg_decode_sequence_display_extension(s1);
2482
        break;
2483
    case 0x3:
2484
        mpeg_decode_quant_matrix_extension(s);
2485
        break;
2486
    case 0x7:
2487
        mpeg_decode_picture_display_extension(s1);
2488
        break;
2489
    case 0x8:
2490
        mpeg_decode_picture_coding_extension(s);
2491
        break;
2492
    }
2493
}
2494

    
2495
static void exchange_uv(MpegEncContext *s){
2496
    short * tmp = s->pblocks[4];
2497
    s->pblocks[4] = s->pblocks[5];
2498
    s->pblocks[5] = tmp;
2499
}
2500

    
2501
static int mpeg_field_start(MpegEncContext *s){
2502
    AVCodecContext *avctx= s->avctx;
2503
    Mpeg1Context *s1 = (Mpeg1Context*)s;
2504

    
2505
    /* start frame decoding */
2506
    if(s->first_field || s->picture_structure==PICT_FRAME){
2507
        if(MPV_frame_start(s, avctx) < 0)
2508
            return -1;
2509

    
2510
        ff_er_frame_start(s);
2511

    
2512
        /* first check if we must repeat the frame */
2513
        s->current_picture_ptr->repeat_pict = 0;
2514
        if (s->repeat_first_field) {
2515
            if (s->progressive_sequence) {
2516
                if (s->top_field_first)
2517
                    s->current_picture_ptr->repeat_pict = 4;
2518
                else
2519
                    s->current_picture_ptr->repeat_pict = 2;
2520
            } else if (s->progressive_frame) {
2521
                s->current_picture_ptr->repeat_pict = 1;
2522
            }
2523
        }
2524

    
2525
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2526
    }else{ //second field
2527
            int i;
2528

    
2529
            if(!s->current_picture_ptr){
2530
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2531
                return -1;
2532
            }
2533

    
2534
            for(i=0; i<4; i++){
2535
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2536
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2537
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2538
                }
2539
            }
2540
    }
2541
#ifdef HAVE_XVMC
2542
// MPV_frame_start will call this function too,
2543
// but we need to call it on every field
2544
    if(s->avctx->xvmc_acceleration)
2545
         XVMC_field_start(s,avctx);
2546
#endif
2547

    
2548
    return 0;
2549
}
2550

    
2551
#define DECODE_SLICE_ERROR -1
2552
#define DECODE_SLICE_OK 0
2553

    
2554
/**
2555
 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2556
 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2557
 *         DECODE_SLICE_OK if this slice is ok<br>
2558
 */
2559
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2560
                             const uint8_t **buf, int buf_size)
2561
{
2562
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2563
    AVCodecContext *avctx= s->avctx;
2564
    int ret;
2565
    const int field_pic= s->picture_structure != PICT_FRAME;
2566
    const int lowres= s->avctx->lowres;
2567

    
2568
    s->resync_mb_x=
2569
    s->resync_mb_y= -1;
2570

    
2571
    if (mb_y<<field_pic >= s->mb_height){
2572
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2573
        return -1;
2574
    }
2575

    
2576
    init_get_bits(&s->gb, *buf, buf_size*8);
2577

    
2578
    ff_mpeg1_clean_buffers(s);
2579
    s->interlaced_dct = 0;
2580

    
2581
    s->qscale = get_qscale(s);
2582

    
2583
    if(s->qscale == 0){
2584
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2585
        return -1;
2586
    }
2587

    
2588
    /* extra slice info */
2589
    while (get_bits1(&s->gb) != 0) {
2590
        skip_bits(&s->gb, 8);
2591
    }
2592

    
2593
    s->mb_x=0;
2594

    
2595
    for(;;) {
2596
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2597
        if (code < 0){
2598
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2599
            return -1;
2600
        }
2601
        if (code >= 33) {
2602
            if (code == 33) {
2603
                s->mb_x += 33;
2604
            }
2605
            /* otherwise, stuffing, nothing to do */
2606
        } else {
2607
            s->mb_x += code;
2608
            break;
2609
        }
2610
    }
2611
    if(s->mb_x >= (unsigned)s->mb_width){
2612
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
2613
        return -1;
2614
    }
2615

    
2616
    s->resync_mb_x= s->mb_x;
2617
    s->resync_mb_y= s->mb_y= mb_y;
2618
    s->mb_skip_run= 0;
2619
    ff_init_block_index(s);
2620

    
2621
    if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2622
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2623
             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",
2624
                 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],
2625
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2626
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2627
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2628
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2629
        }
2630
    }
2631

    
2632
    for(;;) {
2633
#ifdef HAVE_XVMC
2634
        //one 1 we memcpy blocks in xvmcvideo
2635
        if(s->avctx->xvmc_acceleration > 1)
2636
            XVMC_init_block(s);//set s->block
2637
#endif
2638

    
2639
        ret = mpeg_decode_mb(s, s->block);
2640
        s->chroma_qscale= s->qscale;
2641

    
2642
        dprintf(s->avctx, "ret=%d\n", ret);
2643
        if (ret < 0)
2644
            return -1;
2645

    
2646
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2647
            const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2648
            int xy = s->mb_x*2 + s->mb_y*2*wrap;
2649
            int motion_x, motion_y, dir, i;
2650
            if(field_pic && !s->first_field)
2651
                xy += wrap/2;
2652

    
2653
            for(i=0; i<2; i++){
2654
                for(dir=0; dir<2; dir++){
2655
                    if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2656
                        motion_x = motion_y = 0;
2657
                    }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2658
                        motion_x = s->mv[dir][0][0];
2659
                        motion_y = s->mv[dir][0][1];
2660
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2661
                        motion_x = s->mv[dir][i][0];
2662
                        motion_y = s->mv[dir][i][1];
2663
                    }
2664

    
2665
                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2666
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2667
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2668
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2669
                    s->current_picture.ref_index [dir][xy    ]=
2670
                    s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2671
                    assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2672
                }
2673
                xy += wrap;
2674
            }
2675
        }
2676

    
2677
        s->dest[0] += 16 >> lowres;
2678
        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2679
        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2680

    
2681
        MPV_decode_mb(s, s->block);
2682

    
2683
        if (++s->mb_x >= s->mb_width) {
2684
            const int mb_size= 16>>s->avctx->lowres;
2685

    
2686
            ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2687

    
2688
            s->mb_x = 0;
2689
            s->mb_y++;
2690

    
2691
            if(s->mb_y<<field_pic >= s->mb_height){
2692
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2693
                int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2694
                            && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2695
                            && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2696

    
2697
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2698
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2699
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2700
                    return -1;
2701
                }else
2702
                    goto eos;
2703
            }
2704

    
2705
            ff_init_block_index(s);
2706
        }
2707

    
2708
        /* skip mb handling */
2709
        if (s->mb_skip_run == -1) {
2710
            /* read again increment */
2711
            s->mb_skip_run = 0;
2712
            for(;;) {
2713
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2714
                if (code < 0){
2715
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2716
                    return -1;
2717
                }
2718
                if (code >= 33) {
2719
                    if (code == 33) {
2720
                        s->mb_skip_run += 33;
2721
                    }else if(code == 35){
2722
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2723
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2724
                            return -1;
2725
                        }
2726
                        goto eos; /* end of slice */
2727
                    }
2728
                    /* otherwise, stuffing, nothing to do */
2729
                } else {
2730
                    s->mb_skip_run += code;
2731
                    break;
2732
                }
2733
            }
2734
        }
2735
    }
2736
eos: // end of slice
2737
    *buf += get_bits_count(&s->gb)/8 - 1;
2738
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2739
    return 0;
2740
}
2741

    
2742
static int slice_decode_thread(AVCodecContext *c, void *arg){
2743
    MpegEncContext *s= arg;
2744
    const uint8_t *buf= s->gb.buffer;
2745
    int mb_y= s->start_mb_y;
2746

    
2747
    s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2748

    
2749
    for(;;){
2750
        uint32_t start_code;
2751
        int ret;
2752

    
2753
        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2754
        emms_c();
2755
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2756
//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);
2757
        if(ret < 0){
2758
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2759
                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);
2760
        }else{
2761
            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);
2762
        }
2763

    
2764
        if(s->mb_y == s->end_mb_y)
2765
            return 0;
2766

    
2767
        start_code= -1;
2768
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2769
        mb_y= start_code - SLICE_MIN_START_CODE;
2770
        if(mb_y < 0 || mb_y >= s->end_mb_y)
2771
            return -1;
2772
    }
2773

    
2774
    return 0; //not reached
2775
}
2776

    
2777
/**
2778
 * handles slice ends.
2779
 * @return 1 if it seems to be the last slice of
2780
 */
2781
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2782
{
2783
    Mpeg1Context *s1 = avctx->priv_data;
2784
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2785

    
2786
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2787
        return 0;
2788

    
2789
#ifdef HAVE_XVMC
2790
    if(s->avctx->xvmc_acceleration)
2791
        XVMC_field_end(s);
2792
#endif
2793
    /* end of slice reached */
2794
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2795
        /* end of image */
2796

    
2797
        s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2798

    
2799
        ff_er_frame_end(s);
2800

    
2801
        MPV_frame_end(s);
2802

    
2803
        if (s->pict_type == B_TYPE || s->low_delay) {
2804
            *pict= *(AVFrame*)s->current_picture_ptr;
2805
            ff_print_debug_info(s, pict);
2806
        } else {
2807
            s->picture_number++;
2808
            /* latency of 1 frame for I and P frames */
2809
            /* XXX: use another variable than picture_number */
2810
            if (s->last_picture_ptr != NULL) {
2811
                *pict= *(AVFrame*)s->last_picture_ptr;
2812
                 ff_print_debug_info(s, pict);
2813
            }
2814
        }
2815

    
2816
        return 1;
2817
    } else {
2818
        return 0;
2819
    }
2820
}
2821

    
2822
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2823
                                 const uint8_t *buf, int buf_size)
2824
{
2825
    Mpeg1Context *s1 = avctx->priv_data;
2826
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2827
    int width,height;
2828
    int i, v, j;
2829

    
2830
    init_get_bits(&s->gb, buf, buf_size*8);
2831

    
2832
    width = get_bits(&s->gb, 12);
2833
    height = get_bits(&s->gb, 12);
2834
    if (width <= 0 || height <= 0 ||
2835
        (width % 2) != 0 || (height % 2) != 0)
2836
        return -1;
2837
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2838
    if (s->aspect_ratio_info == 0)
2839
        return -1;
2840
    s->frame_rate_index = get_bits(&s->gb, 4);
2841
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2842
        return -1;
2843
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2844
    if (get_bits1(&s->gb) == 0) /* marker */
2845
        return -1;
2846
    s->width = width;
2847
    s->height = height;
2848

    
2849
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2850
    skip_bits(&s->gb, 1);
2851

    
2852
    /* get matrix */
2853
    if (get_bits1(&s->gb)) {
2854
        for(i=0;i<64;i++) {
2855
            v = get_bits(&s->gb, 8);
2856
            if(v==0){
2857
                av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2858
                return -1;
2859
            }
2860
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2861
            s->intra_matrix[j] = v;
2862
            s->chroma_intra_matrix[j] = v;
2863
        }
2864
#ifdef DEBUG
2865
        dprintf(s->avctx, "intra matrix present\n");
2866
        for(i=0;i<64;i++)
2867
            dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2868
        dprintf(s->avctx, "\n");
2869
#endif
2870
    } else {
2871
        for(i=0;i<64;i++) {
2872
            j = s->dsp.idct_permutation[i];
2873
            v = ff_mpeg1_default_intra_matrix[i];
2874
            s->intra_matrix[j] = v;
2875
            s->chroma_intra_matrix[j] = v;
2876
        }
2877
    }
2878
    if (get_bits1(&s->gb)) {
2879
        for(i=0;i<64;i++) {
2880
            v = get_bits(&s->gb, 8);
2881
            if(v==0){
2882
                av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2883
                return -1;
2884
            }
2885
            j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2886
            s->inter_matrix[j] = v;
2887
            s->chroma_inter_matrix[j] = v;
2888
        }
2889
#ifdef DEBUG
2890
        dprintf(s->avctx, "non intra matrix present\n");
2891
        for(i=0;i<64;i++)
2892
            dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2893
        dprintf(s->avctx, "\n");
2894
#endif
2895
    } else {
2896
        for(i=0;i<64;i++) {
2897
            int j= s->dsp.idct_permutation[i];
2898
            v = ff_mpeg1_default_non_intra_matrix[i];
2899
            s->inter_matrix[j] = v;
2900
            s->chroma_inter_matrix[j] = v;
2901
        }
2902
    }
2903

    
2904
    if(show_bits(&s->gb, 23) != 0){
2905
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2906
        return -1;
2907
    }
2908

    
2909
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2910
    s->progressive_sequence = 1;
2911
    s->progressive_frame = 1;
2912
    s->picture_structure = PICT_FRAME;
2913
    s->frame_pred_frame_dct = 1;
2914
    s->chroma_format = 1;
2915
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2916
    avctx->sub_id = 1; /* indicates mpeg1 */
2917
    s->out_format = FMT_MPEG1;
2918
    s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2919
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2920

    
2921
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2922
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2923
               s->avctx->rc_buffer_size, s->bit_rate);
2924

    
2925
    return 0;
2926
}
2927

    
2928
static int vcr2_init_sequence(AVCodecContext *avctx)
2929
{
2930
    Mpeg1Context *s1 = avctx->priv_data;
2931
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2932
    int i, v;
2933

    
2934
    /* start new mpeg1 context decoding */
2935
    s->out_format = FMT_MPEG1;
2936
    if (s1->mpeg_enc_ctx_allocated) {
2937
        MPV_common_end(s);
2938
    }
2939
    s->width  = avctx->coded_width;
2940
    s->height = avctx->coded_height;
2941
    avctx->has_b_frames= 0; //true?
2942
    s->low_delay= 1;
2943

    
2944
    if(avctx->xvmc_acceleration){
2945
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2946
    }else{
2947
        avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2948
    }
2949

    
2950
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2951
        if( avctx->idct_algo == FF_IDCT_AUTO )
2952
            avctx->idct_algo = FF_IDCT_SIMPLE;
2953

    
2954
    if (MPV_common_init(s) < 0)
2955
        return -1;
2956
    exchange_uv(s);//common init reset pblocks, so we swap them here
2957
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2958
    s1->mpeg_enc_ctx_allocated = 1;
2959

    
2960
    for(i=0;i<64;i++) {
2961
        int j= s->dsp.idct_permutation[i];
2962
        v = ff_mpeg1_default_intra_matrix[i];
2963
        s->intra_matrix[j] = v;
2964
        s->chroma_intra_matrix[j] = v;
2965

    
2966
        v = ff_mpeg1_default_non_intra_matrix[i];
2967
        s->inter_matrix[j] = v;
2968
        s->chroma_inter_matrix[j] = v;
2969
    }
2970

    
2971
    s->progressive_sequence = 1;
2972
    s->progressive_frame = 1;
2973
    s->picture_structure = PICT_FRAME;
2974
    s->frame_pred_frame_dct = 1;
2975
    s->chroma_format = 1;
2976
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2977
    avctx->sub_id = 2; /* indicates mpeg2 */
2978
    return 0;
2979
}
2980

    
2981

    
2982
static void mpeg_decode_user_data(AVCodecContext *avctx,
2983
                                  const uint8_t *buf, int buf_size)
2984
{
2985
    const uint8_t *p;
2986
    int len, flags;
2987
    p = buf;
2988
    len = buf_size;
2989

    
2990
    /* we parse the DTG active format information */
2991
    if (len >= 5 &&
2992
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2993
        flags = p[4];
2994
        p += 5;
2995
        len -= 5;
2996
        if (flags & 0x80) {
2997
            /* skip event id */
2998
            if (len < 2)
2999
                return;
3000
            p += 2;
3001
            len -= 2;
3002
        }
3003
        if (flags & 0x40) {
3004
            if (len < 1)
3005
                return;
3006
            avctx->dtg_active_format = p[0] & 0x0f;
3007
        }
3008
    }
3009
}
3010

    
3011
static void mpeg_decode_gop(AVCodecContext *avctx,
3012
                            const uint8_t *buf, int buf_size){
3013
    Mpeg1Context *s1 = avctx->priv_data;
3014
    MpegEncContext *s = &s1->mpeg_enc_ctx;
3015

    
3016
    int drop_frame_flag;
3017
    int time_code_hours, time_code_minutes;
3018
    int time_code_seconds, time_code_pictures;
3019
    int broken_link;
3020

    
3021
    init_get_bits(&s->gb, buf, buf_size*8);
3022

    
3023
    drop_frame_flag = get_bits1(&s->gb);
3024

    
3025
    time_code_hours=get_bits(&s->gb,5);
3026
    time_code_minutes = get_bits(&s->gb,6);
3027
    skip_bits1(&s->gb);//marker bit
3028
    time_code_seconds = get_bits(&s->gb,6);
3029
    time_code_pictures = get_bits(&s->gb,6);
3030

    
3031
    /*broken_link indicate that after editing the
3032
      reference frames of the first B-Frames after GOP I-Frame
3033
      are missing (open gop)*/
3034
    broken_link = get_bits1(&s->gb);
3035

    
3036
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
3037
        av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
3038
            time_code_hours, time_code_minutes, time_code_seconds,
3039
            time_code_pictures, broken_link);
3040
}
3041
/**
3042
 * finds the end of the current frame in the bitstream.
3043
 * @return the position of the first byte of the next frame, or -1
3044
 */
3045
static int mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
3046
{
3047
    int i;
3048
    uint32_t state= pc->state;
3049

    
3050
    i=0;
3051
    if(!pc->frame_start_found){
3052
        for(i=0; i<buf_size; i++){
3053
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3054
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3055
                i++;
3056
                pc->frame_start_found=1;
3057
                break;
3058
            }
3059
        }
3060
    }
3061

    
3062
    if(pc->frame_start_found){
3063
        /* EOF considered as end of frame */
3064
        if (buf_size == 0)
3065
            return 0;
3066
        for(; i<buf_size; i++){
3067
            i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3068
            if((state&0xFFFFFF00) == 0x100){
3069
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3070
                    pc->frame_start_found=0;
3071
                    pc->state=-1;
3072
                    return i-3;
3073
                }
3074
            }
3075
        }
3076
    }
3077
    pc->state= state;
3078
    return END_NOT_FOUND;
3079
}
3080

    
3081
/* handle buffering and image synchronisation */
3082
static int mpeg_decode_frame(AVCodecContext *avctx,
3083
                             void *data, int *data_size,
3084
                             uint8_t *buf, int buf_size)
3085
{
3086
    Mpeg1Context *s = avctx->priv_data;
3087
    const uint8_t *buf_end;
3088
    const uint8_t *buf_ptr;
3089
    uint32_t start_code;
3090
    int ret, input_size;
3091
    AVFrame *picture = data;
3092
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
3093
    dprintf(avctx, "fill_buffer\n");
3094

    
3095
    if (buf_size == 0) {
3096
        /* special case for last picture */
3097
        if (s2->low_delay==0 && s2->next_picture_ptr) {
3098
            *picture= *(AVFrame*)s2->next_picture_ptr;
3099
            s2->next_picture_ptr= NULL;
3100

    
3101
            *data_size = sizeof(AVFrame);
3102
        }
3103
        return 0;
3104
    }
3105

    
3106
    if(s2->flags&CODEC_FLAG_TRUNCATED){
3107
        int next= mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3108

    
3109
        if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
3110
            return buf_size;
3111
    }
3112

    
3113
    buf_ptr = buf;
3114
    buf_end = buf + buf_size;
3115

    
3116
#if 0
3117
    if (s->repeat_field % 2 == 1) {
3118
        s->repeat_field++;
3119
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3120
        //        s2->picture_number, s->repeat_field);
3121
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3122
            *data_size = sizeof(AVPicture);
3123
            goto the_end;
3124
        }
3125
    }
3126
#endif
3127

    
3128
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3129
        vcr2_init_sequence(avctx);
3130

    
3131
    s->slice_count= 0;
3132

    
3133
    for(;;) {
3134
        /* find start next code */
3135
        start_code = -1;
3136
        buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3137
        if (start_code > 0x1ff){
3138
            if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3139
                if(avctx->thread_count > 1){
3140
                    int i;
3141

    
3142
                    avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3143
                    for(i=0; i<s->slice_count; i++)
3144
                        s2->error_count += s2->thread_context[i]->error_count;
3145
                }
3146
                if (slice_end(avctx, picture)) {
3147
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3148
                        *data_size = sizeof(AVPicture);
3149
                }
3150
            }
3151
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3152
        }
3153

    
3154
        input_size = buf_end - buf_ptr;
3155

    
3156
        if(avctx->debug & FF_DEBUG_STARTCODE){
3157
            av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3158
        }
3159

    
3160
        /* prepare data for next start code */
3161
        switch(start_code) {
3162
        case SEQ_START_CODE:
3163
            mpeg1_decode_sequence(avctx, buf_ptr,
3164
                                    input_size);
3165
            break;
3166

    
3167
        case PICTURE_START_CODE:
3168
            /* we have a complete image : we try to decompress it */
3169
            mpeg1_decode_picture(avctx,
3170
                                    buf_ptr, input_size);
3171
            break;
3172
        case EXT_START_CODE:
3173
            mpeg_decode_extension(avctx,
3174
                                    buf_ptr, input_size);
3175
            break;
3176
        case USER_START_CODE:
3177
            mpeg_decode_user_data(avctx,
3178
                                    buf_ptr, input_size);
3179
            break;
3180
        case GOP_START_CODE:
3181
            s2->first_field=0;
3182
            mpeg_decode_gop(avctx,
3183
                                    buf_ptr, input_size);
3184
            break;
3185
        default:
3186
            if (start_code >= SLICE_MIN_START_CODE &&
3187
                start_code <= SLICE_MAX_START_CODE) {
3188
                int mb_y= start_code - SLICE_MIN_START_CODE;
3189

    
3190
                if(s2->last_picture_ptr==NULL){
3191
                /* skip b frames if we dont have reference frames */
3192
                    if(s2->pict_type==B_TYPE) break;
3193
                /* skip P frames if we dont have reference frame no valid header */
3194
//                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3195
                }
3196
                /* skip b frames if we are in a hurry */
3197
                if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3198
                if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3199
                    ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3200
                    || avctx->skip_frame >= AVDISCARD_ALL)
3201
                    break;
3202
                /* skip everything if we are in a hurry>=5 */
3203
                if(avctx->hurry_up>=5) break;
3204

    
3205
                if (!s->mpeg_enc_ctx_allocated) break;
3206

    
3207
                if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3208
                    if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3209
                        break;
3210
                }
3211

    
3212
                if(s2->first_slice){
3213
                    s2->first_slice=0;
3214
                            if(mpeg_field_start(s2) < 0)
3215
                        return -1;
3216
                    }
3217
                if(!s2->current_picture_ptr){
3218
                    av_log(avctx, AV_LOG_ERROR, "current_picture not initalized\n");
3219
                    return -1;
3220
                }
3221

    
3222
                if(avctx->thread_count > 1){
3223
                    int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3224
                    if(threshold <= mb_y){
3225
                        MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3226

    
3227
                        thread_context->start_mb_y= mb_y;
3228
                        thread_context->end_mb_y  = s2->mb_height;
3229
                        if(s->slice_count){
3230
                            s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3231
                            ff_update_duplicate_context(thread_context, s2);
3232
                        }
3233
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3234
                        s->slice_count++;
3235
                    }
3236
                    buf_ptr += 2; //FIXME add minimum num of bytes per slice
3237
                }else{
3238
                    ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3239
                    emms_c();
3240

    
3241
                    if(ret < 0){
3242
                        if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3243
                            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);
3244
                    }else{
3245
                        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);
3246
                    }
3247
                }
3248
            }
3249
            break;
3250
        }
3251
    }
3252
}
3253

    
3254
static int mpeg_decode_end(AVCodecContext *avctx)
3255
{
3256
    Mpeg1Context *s = avctx->priv_data;
3257

    
3258
    if (s->mpeg_enc_ctx_allocated)
3259
        MPV_common_end(&s->mpeg_enc_ctx);
3260
    return 0;
3261
}
3262

    
3263
AVCodec mpeg1video_decoder = {
3264
    "mpeg1video",
3265
    CODEC_TYPE_VIDEO,
3266
    CODEC_ID_MPEG1VIDEO,
3267
    sizeof(Mpeg1Context),
3268
    mpeg_decode_init,
3269
    NULL,
3270
    mpeg_decode_end,
3271
    mpeg_decode_frame,
3272
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3273
    .flush= ff_mpeg_flush,
3274
};
3275

    
3276
AVCodec mpeg2video_decoder = {
3277
    "mpeg2video",
3278
    CODEC_TYPE_VIDEO,
3279
    CODEC_ID_MPEG2VIDEO,
3280
    sizeof(Mpeg1Context),
3281
    mpeg_decode_init,
3282
    NULL,
3283
    mpeg_decode_end,
3284
    mpeg_decode_frame,
3285
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3286
    .flush= ff_mpeg_flush,
3287
};
3288

    
3289
//legacy decoder
3290
AVCodec mpegvideo_decoder = {
3291
    "mpegvideo",
3292
    CODEC_TYPE_VIDEO,
3293
    CODEC_ID_MPEG2VIDEO,
3294
    sizeof(Mpeg1Context),
3295
    mpeg_decode_init,
3296
    NULL,
3297
    mpeg_decode_end,
3298
    mpeg_decode_frame,
3299
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3300
    .flush= ff_mpeg_flush,
3301
};
3302

    
3303
#ifdef CONFIG_ENCODERS
3304

    
3305
AVCodec mpeg1video_encoder = {
3306
    "mpeg1video",
3307
    CODEC_TYPE_VIDEO,
3308
    CODEC_ID_MPEG1VIDEO,
3309
    sizeof(MpegEncContext),
3310
    encode_init,
3311
    MPV_encode_picture,
3312
    MPV_encode_end,
3313
    .supported_framerates= ff_frame_rate_tab+1,
3314
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3315
    .capabilities= CODEC_CAP_DELAY,
3316
};
3317

    
3318
AVCodec mpeg2video_encoder = {
3319
    "mpeg2video",
3320
    CODEC_TYPE_VIDEO,
3321
    CODEC_ID_MPEG2VIDEO,
3322
    sizeof(MpegEncContext),
3323
    encode_init,
3324
    MPV_encode_picture,
3325
    MPV_encode_end,
3326
    .supported_framerates= ff_frame_rate_tab+1,
3327
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3328
    .capabilities= CODEC_CAP_DELAY,
3329
};
3330
#endif
3331

    
3332
#ifdef HAVE_XVMC
3333
static int mpeg_mc_decode_init(AVCodecContext *avctx){
3334
    Mpeg1Context *s;
3335

    
3336
    if( avctx->thread_count > 1)
3337
        return -1;
3338
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3339
        return -1;
3340
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3341
        dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3342
    }
3343
    mpeg_decode_init(avctx);
3344
    s = avctx->priv_data;
3345

    
3346
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3347
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3348

    
3349
    return 0;
3350
}
3351

    
3352
AVCodec mpeg_xvmc_decoder = {
3353
    "mpegvideo_xvmc",
3354
    CODEC_TYPE_VIDEO,
3355
    CODEC_ID_MPEG2VIDEO_XVMC,
3356
    sizeof(Mpeg1Context),
3357
    mpeg_mc_decode_init,
3358
    NULL,
3359
    mpeg_decode_end,
3360
    mpeg_decode_frame,
3361
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3362
    .flush= ff_mpeg_flush,
3363
};
3364

    
3365
#endif
3366

    
3367
#ifdef CONFIG_MPEGVIDEO_PARSER
3368
static void mpegvideo_extract_headers(AVCodecParserContext *s,
3369
                                      AVCodecContext *avctx,
3370
                                      const uint8_t *buf, int buf_size)
3371
{
3372
    ParseContext1 *pc = s->priv_data;
3373
    const uint8_t *buf_end;
3374
    uint32_t start_code;
3375
    int frame_rate_index, ext_type, bytes_left;
3376
    int frame_rate_ext_n, frame_rate_ext_d;
3377
    int picture_structure, top_field_first, repeat_first_field, progressive_frame;
3378
    int horiz_size_ext, vert_size_ext, bit_rate_ext;
3379
//FIXME replace the crap with get_bits()
3380
    s->repeat_pict = 0;
3381
    buf_end = buf + buf_size;
3382
    while (buf < buf_end) {
3383
        start_code= -1;
3384
        buf= ff_find_start_code(buf, buf_end, &start_code);
3385
        bytes_left = buf_end - buf;
3386
        switch(start_code) {
3387
        case PICTURE_START_CODE:
3388
            if (bytes_left >= 2) {
3389
                s->pict_type = (buf[1] >> 3) & 7;
3390
            }
3391
            break;
3392
        case SEQ_START_CODE:
3393
            if (bytes_left >= 7) {
3394
                pc->width  = (buf[0] << 4) | (buf[1] >> 4);
3395
                pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
3396
                avcodec_set_dimensions(avctx, pc->width, pc->height);
3397
                frame_rate_index = buf[3] & 0xf;
3398
                pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
3399
                pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
3400
                avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
3401
                avctx->codec_id = CODEC_ID_MPEG1VIDEO;
3402
                avctx->sub_id = 1;
3403
            }
3404
            break;
3405
        case EXT_START_CODE:
3406
            if (bytes_left >= 1) {
3407
                ext_type = (buf[0] >> 4);
3408
                switch(ext_type) {
3409
                case 0x1: /* sequence extension */
3410
                    if (bytes_left >= 6) {
3411
                        horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
3412
                        vert_size_ext = (buf[2] >> 5) & 3;
3413
                        bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
3414
                        frame_rate_ext_n = (buf[5] >> 5) & 3;
3415
                        frame_rate_ext_d = (buf[5] & 0x1f);
3416
                        pc->progressive_sequence = buf[1] & (1 << 3);
3417
                        avctx->has_b_frames= !(buf[5] >> 7);
3418

    
3419
                        pc->width  |=(horiz_size_ext << 12);
3420
                        pc->height |=( vert_size_ext << 12);
3421
                        avctx->bit_rate += (bit_rate_ext << 18) * 400;
3422
                        avcodec_set_dimensions(avctx, pc->width, pc->height);
3423
                        avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
3424
                        avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
3425
                        avctx->codec_id = CODEC_ID_MPEG2VIDEO;
3426
                        avctx->sub_id = 2; /* forces MPEG2 */
3427
                    }
3428
                    break;
3429
                case 0x8: /* picture coding extension */
3430
                    if (bytes_left >= 5) {
3431
                        picture_structure = buf[2]&3;
3432
                        top_field_first = buf[3] & (1 << 7);
3433
                        repeat_first_field = buf[3] & (1 << 1);
3434
                        progressive_frame = buf[4] & (1 << 7);
3435

    
3436
                        /* check if we must repeat the frame */
3437
                        if (repeat_first_field) {
3438
                            if (pc->progressive_sequence) {
3439
                                if (top_field_first)
3440
                                    s->repeat_pict = 4;
3441
                                else
3442
                                    s->repeat_pict = 2;
3443
                            } else if (progressive_frame) {
3444
                                s->repeat_pict = 1;
3445
                            }
3446
                        }
3447

    
3448
                        /* the packet only represents half a frame
3449
                           XXX,FIXME maybe find a different solution */
3450
                        if(picture_structure != 3)
3451
                            s->repeat_pict = -1;
3452
                    }
3453
                    break;
3454
                }
3455
            }
3456
            break;
3457
        case -1:
3458
            goto the_end;
3459
        default:
3460
            /* we stop parsing when we encounter a slice. It ensures
3461
               that this function takes a negligible amount of time */
3462
            if (start_code >= SLICE_MIN_START_CODE &&
3463
                start_code <= SLICE_MAX_START_CODE)
3464
                goto the_end;
3465
            break;
3466
        }
3467
    }
3468
 the_end: ;
3469
}
3470

    
3471
static int mpegvideo_parse(AVCodecParserContext *s,
3472
                           AVCodecContext *avctx,
3473
                           uint8_t **poutbuf, int *poutbuf_size,
3474
                           const uint8_t *buf, int buf_size)
3475
{
3476
    ParseContext1 *pc1 = s->priv_data;
3477
    ParseContext *pc= &pc1->pc;
3478
    int next;
3479

    
3480
    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
3481
        next= buf_size;
3482
    }else{
3483
        next= mpeg1_find_frame_end(pc, buf, buf_size);
3484

    
3485
        if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
3486
            *poutbuf = NULL;
3487
            *poutbuf_size = 0;
3488
            return buf_size;
3489
        }
3490

    
3491
    }
3492
    /* we have a full frame : we just parse the first few MPEG headers
3493
       to have the full timing information. The time take by this
3494
       function should be negligible for uncorrupted streams */
3495
    mpegvideo_extract_headers(s, avctx, buf, buf_size);
3496
#if 0
3497
    printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
3498
           s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
3499
#endif
3500

    
3501
    *poutbuf = (uint8_t *)buf;
3502
    *poutbuf_size = buf_size;
3503
    return next;
3504
}
3505

    
3506
static int mpegvideo_split(AVCodecContext *avctx,
3507
                           const uint8_t *buf, int buf_size)
3508
{
3509
    int i;
3510
    uint32_t state= -1;
3511

    
3512
    for(i=0; i<buf_size; i++){
3513
        state= (state<<8) | buf[i];
3514
        if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
3515
            return i-3;
3516
    }
3517
    return 0;
3518
}
3519

    
3520
AVCodecParser mpegvideo_parser = {
3521
    { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
3522
    sizeof(ParseContext1),
3523
    NULL,
3524
    mpegvideo_parse,
3525
    ff_parse1_close,
3526
    mpegvideo_split,
3527
};
3528
#endif /* !CONFIG_MPEGVIDEO_PARSER */
3529

    
3530
static int imx_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
3531
                           uint8_t **poutbuf, int *poutbuf_size,
3532
                           const uint8_t *buf, int buf_size, int keyframe)
3533
{
3534
    /* MXF essence element key */
3535
    static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
3536
    uint8_t *poutbufp;
3537

    
3538
    if (avctx->codec_id != CODEC_ID_MPEG2VIDEO) {
3539
        av_log(avctx, AV_LOG_ERROR, "imx bitstream filter only applies to mpeg2video codec\n");
3540
        return 0;
3541
    }
3542

    
3543
    *poutbuf = av_malloc(buf_size + 20 + FF_INPUT_BUFFER_PADDING_SIZE);
3544
    poutbufp = *poutbuf;
3545
    bytestream_put_buffer(&poutbufp, imx_header, 16);
3546
    bytestream_put_byte(&poutbufp, 0x83); /* KLV BER long form */
3547
    bytestream_put_be24(&poutbufp, buf_size);
3548
    bytestream_put_buffer(&poutbufp, buf, buf_size);
3549
    *poutbuf_size = poutbufp - *poutbuf;
3550
    return 1;
3551
}
3552

    
3553
AVBitStreamFilter imx_dump_header_bsf = {
3554
    "imxdump",
3555
    0,
3556
    imx_dump_header,
3557
};
3558

    
3559
/* this is ugly i know, but the alternative is too make
3560
   hundreds of vars global and prefix them with ff_mpeg1_
3561
   which is far uglier. */
3562
#include "mdec.c"