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ffmpeg / libavcodec / mpeg12.c @ 11e29a41

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1 de6d9b64 Fabrice Bellard
/*
2 983e3246 Michael Niedermayer
 * MPEG1 codec / MPEG2 decoder
3 ff4ec49e Fabrice Bellard
 * Copyright (c) 2000,2001 Fabrice Bellard.
4 de6d9b64 Fabrice Bellard
 *
5 ff4ec49e Fabrice Bellard
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9 de6d9b64 Fabrice Bellard
 *
10 ff4ec49e Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
11 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ff4ec49e Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14 de6d9b64 Fabrice Bellard
 *
15 ff4ec49e Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 de6d9b64 Fabrice Bellard
 */
19 983e3246 Michael Niedermayer
 
20
/**
21
 * @file mpeg12.c
22 029911d1 Michael Niedermayer
 * MPEG1/2 codec
23 983e3246 Michael Niedermayer
 */
24
 
25 a74127c0 Fabrice Bellard
//#define DEBUG
26 de6d9b64 Fabrice Bellard
#include "avcodec.h"
27
#include "dsputil.h"
28
#include "mpegvideo.h"
29
30
#include "mpeg12data.h"
31
32 d87c0267 Michael Niedermayer
33 de6d9b64 Fabrice Bellard
/* Start codes. */
34
#define SEQ_END_CODE                0x000001b7
35
#define SEQ_START_CODE                0x000001b3
36
#define GOP_START_CODE                0x000001b8
37
#define PICTURE_START_CODE        0x00000100
38
#define SLICE_MIN_START_CODE        0x00000101
39
#define SLICE_MAX_START_CODE        0x000001af
40
#define EXT_START_CODE                0x000001b5
41
#define USER_START_CODE                0x000001b2
42
43 4f68b084 Michael Niedermayer
#define DC_VLC_BITS 9
44
#define MV_VLC_BITS 9
45
#define MBINCR_VLC_BITS 9
46
#define MB_PAT_VLC_BITS 9
47
#define MB_PTYPE_VLC_BITS 6
48
#define MB_BTYPE_VLC_BITS 6
49
#define TEX_VLC_BITS 9
50
51 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
52 de6d9b64 Fabrice Bellard
static void mpeg1_encode_block(MpegEncContext *s, 
53
                         DCTELEM *block, 
54
                         int component);
55 63b15e55 Michael Niedermayer
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
56 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
57 de6d9b64 Fabrice Bellard
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
58 a0201736 Michael Niedermayer
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
59
                              DCTELEM *block, 
60
                              int n);
61
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
62 de6d9b64 Fabrice Bellard
                              DCTELEM *block, 
63
                              int n);
64 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
65 de6d9b64 Fabrice Bellard
                                        DCTELEM *block, 
66
                                        int n);
67 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
68 de6d9b64 Fabrice Bellard
                                    DCTELEM *block, 
69
                                    int n);
70
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
71
72 2e7b4c84 Ivan Kalvachev
#ifdef HAVE_XVMC
73
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
74
extern int XVMC_field_end(MpegEncContext *s);
75 a579db0c Ivan Kalvachev
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
76
extern void XVMC_init_block(s);//set s->block
77 2e7b4c84 Ivan Kalvachev
#endif
78
79 c442d75c Michael Niedermayer
#ifdef CONFIG_ENCODERS
80 30952237 Michael Niedermayer
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
81 0c1a9eda Zdenek Kabelac
static uint8_t fcode_tab[MAX_MV*2+1];
82 11ce8834 Michael Niedermayer
83 c442d75c Michael Niedermayer
static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
84
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
85 2a250222 Michael Niedermayer
86
/* simple include everything table for dc, first byte is bits number next 3 are code*/
87
static uint32_t mpeg1_lum_dc_uni[512];
88
static uint32_t mpeg1_chr_dc_uni[512];
89
90
static uint8_t mpeg1_index_run[2][64];
91
static int8_t mpeg1_max_level[2][64];
92 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
93 c442d75c Michael Niedermayer
94 4f68b084 Michael Niedermayer
static void init_2d_vlc_rl(RLTable *rl)
95
{
96 07787186 Dominik Mierzejewski
    int i;
97 4f68b084 Michael Niedermayer
    
98
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
99
             &rl->table_vlc[0][1], 4, 2,
100
             &rl->table_vlc[0][0], 4, 2);
101
102
    
103
    rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
104
    for(i=0; i<rl->vlc.table_size; i++){
105
        int code= rl->vlc.table[i][0];
106
        int len = rl->vlc.table[i][1];
107
        int level, run;
108
    
109
        if(len==0){ // illegal code
110
            run= 65;
111
            level= MAX_LEVEL;
112
        }else if(len<0){ //more bits needed
113
            run= 0;
114
            level= code;
115
        }else{
116
            if(code==rl->n){ //esc
117
                run= 65;
118
                level= 0;
119
            }else if(code==rl->n+1){ //eob
120 a0201736 Michael Niedermayer
                run= 0;
121
                level= 127;
122 4f68b084 Michael Niedermayer
            }else{
123
                run=   rl->table_run  [code] + 1;
124
                level= rl->table_level[code];
125
            }
126
        }
127
        rl->rl_vlc[0][i].len= len;
128
        rl->rl_vlc[0][i].level= level;
129
        rl->rl_vlc[0][i].run= run;
130
    }
131
}
132
133 2a250222 Michael Niedermayer
#ifdef CONFIG_ENCODERS
134 c442d75c Michael Niedermayer
static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
135
    int i;
136
137
    for(i=0; i<128; i++){
138
        int level= i-64;
139
        int run;
140
        for(run=0; run<64; run++){
141
            int len, bits, code;
142
            
143
            int alevel= ABS(level);
144
            int sign= (level>>31)&1;
145
146
            if (alevel > rl->max_level[0][run])
147
                code= 111; /*rl->n*/
148
            else
149
                code= rl->index_run[0][run] + alevel - 1;
150
151
            if (code < 111 /* rl->n */) {
152
                    /* store the vlc & sign at once */
153
                len=   mpeg1_vlc[code][1]+1;
154
                bits= (mpeg1_vlc[code][0]<<1) + sign;
155
            } else {
156
                len=  mpeg1_vlc[111/*rl->n*/][1]+6;
157
                bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
158
159
                bits|= run;
160
                if (alevel < 128) {
161
                    bits<<=8; len+=8;
162
                    bits|= level & 0xff;
163
                } else {
164
                    bits<<=16; len+=16;
165
                    bits|= level & 0xff;
166
                    if (level < 0) {
167
                        bits|= 0x8001 + level + 255;
168
                    } else {
169
                        bits|= level & 0xffff;
170
                    }
171
                }
172
            }
173
174
            uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
175
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
176
        }
177
    }
178
}
179 4f68b084 Michael Niedermayer
180 de6d9b64 Fabrice Bellard
static void put_header(MpegEncContext *s, int header)
181
{
182
    align_put_bits(&s->pb);
183 80feb2a2 Michael Niedermayer
    put_bits(&s->pb, 16, header>>16);
184
    put_bits(&s->pb, 16, header&0xFFFF);
185 de6d9b64 Fabrice Bellard
}
186
187
/* put sequence header if needed */
188
static void mpeg1_encode_sequence_header(MpegEncContext *s)
189
{
190
        unsigned int vbv_buffer_size;
191 d78647e8 Fabrice Bellard
        unsigned int fps, v;
192 426b8061 Michael Niedermayer
        int n, i;
193 0c1a9eda Zdenek Kabelac
        uint64_t time_code;
194 426b8061 Michael Niedermayer
        float best_aspect_error= 1E10;
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        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
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        int constraint_parameter_flag;
197 426b8061 Michael Niedermayer
        
198 5ff85f1d Michael Niedermayer
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
199 de6d9b64 Fabrice Bellard
        
200 1e491e29 Michael Niedermayer
        if (s->current_picture.key_frame) {
201 de6d9b64 Fabrice Bellard
            /* mpeg1 header repeated every gop */
202
            put_header(s, SEQ_START_CODE);
203
            
204
            /* search closest frame rate */
205
            {
206
                int i, dmin, d;
207
                s->frame_rate_index = 0;
208
                dmin = 0x7fffffff;
209 14bea432 Michael Niedermayer
                for(i=1;i<14;i++) {
210
                    if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
211
                     
212
                    d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
213 de6d9b64 Fabrice Bellard
                    if (d < dmin) {
214
                        dmin = d;
215
                        s->frame_rate_index = i;
216
                    }
217
                }
218
            }
219
 
220
            put_bits(&s->pb, 12, s->width);
221
            put_bits(&s->pb, 12, s->height);
222 426b8061 Michael Niedermayer
            
223
            for(i=1; i<15; i++){
224 5c9e4723 Michael Niedermayer
                float error= aspect_ratio;
225
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
226 f259747b Michael Niedermayer
                    error-= 1.0/mpeg1_aspect[i];
227 5c9e4723 Michael Niedermayer
                else
228
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
229
             
230 426b8061 Michael Niedermayer
                error= ABS(error);
231
                
232
                if(error < best_aspect_error){
233
                    best_aspect_error= error;
234
                    s->aspect_ratio_info= i;
235
                }
236
            }
237
            
238
            put_bits(&s->pb, 4, s->aspect_ratio_info);
239 de6d9b64 Fabrice Bellard
            put_bits(&s->pb, 4, s->frame_rate_index);
240 12dccd4e Michael Niedermayer
            
241
            if(s->avctx->rc_max_rate){
242
                v = (s->avctx->rc_max_rate + 399) / 400;
243
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
244
                    v = 0x3ffff;
245
            }else{
246
                v= 0x3FFFF;
247
            }
248 ecfd40b3 Henry Mason
249
            if(s->avctx->rc_buffer_size)
250
                vbv_buffer_size = s->avctx->rc_buffer_size;
251
            else
252
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
253 12dccd4e Michael Niedermayer
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
254
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
255
256
            put_bits(&s->pb, 18, v & 0x3FFFF);
257
            put_bits(&s->pb, 1, 1); /* marker */
258 98b0858e Michael Niedermayer
            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
259
260
            constraint_parameter_flag= 
261
                s->width <= 768 && s->height <= 576 && 
262
                s->mb_width * s->mb_height <= 396 &&
263
                s->mb_width * s->mb_height * frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*396*25 &&
264
                frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*30 &&
265
                vbv_buffer_size <= 20 &&
266
                v <= 1856000/400 &&
267
                s->codec_id == CODEC_ID_MPEG1VIDEO;
268
                
269
            put_bits(&s->pb, 1, constraint_parameter_flag);
270 d6eb3c50 Michael Niedermayer
            
271
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
272
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
273 de6d9b64 Fabrice Bellard
274 029911d1 Michael Niedermayer
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
275
                put_header(s, EXT_START_CODE);
276
                put_bits(&s->pb, 4, 1); //seq ext
277
                put_bits(&s->pb, 1, 0); //esc
278
                put_bits(&s->pb, 3, 4); //profile
279
                put_bits(&s->pb, 4, 8); //level
280
                put_bits(&s->pb, 1, s->progressive_sequence=1);
281
                put_bits(&s->pb, 2, 1); //chroma format 4:2:0
282
                put_bits(&s->pb, 2, 0); //horizontal size ext
283
                put_bits(&s->pb, 2, 0); //vertical size ext
284
                put_bits(&s->pb, 12, v>>18); //bitrate ext
285
                put_bits(&s->pb, 1, 1); //marker
286
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
287
                put_bits(&s->pb, 1, s->low_delay);
288
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
289
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
290
            }
291
            
292 de6d9b64 Fabrice Bellard
            put_header(s, GOP_START_CODE);
293
            put_bits(&s->pb, 1, 0); /* do drop frame */
294
            /* time code : we must convert from the real frame rate to a
295
               fake mpeg frame rate in case of low frame rate */
296
            fps = frame_rate_tab[s->frame_rate_index];
297 14bea432 Michael Niedermayer
            time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
298 de6d9b64 Fabrice Bellard
            s->gop_picture_number = s->fake_picture_number;
299 0c1a9eda Zdenek Kabelac
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
300
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
301 de6d9b64 Fabrice Bellard
            put_bits(&s->pb, 1, 1);
302 0c1a9eda Zdenek Kabelac
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
303 14bea432 Michael Niedermayer
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
304 69b0ff3a Michael Niedermayer
            put_bits(&s->pb, 1, 0); /* closed gop */
305 de6d9b64 Fabrice Bellard
            put_bits(&s->pb, 1, 0); /* broken link */
306
        }
307
308 14bea432 Michael Niedermayer
        if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
309 de6d9b64 Fabrice Bellard
            /* insert empty P pictures to slow down to the desired
310
               frame rate. Each fake pictures takes about 20 bytes */
311
            fps = frame_rate_tab[s->frame_rate_index];
312 14bea432 Michael Niedermayer
            n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
313 de6d9b64 Fabrice Bellard
            while (s->fake_picture_number < n) {
314
                mpeg1_skip_picture(s, s->fake_picture_number - 
315
                                   s->gop_picture_number); 
316
                s->fake_picture_number++;
317
            }
318
319
        }
320
}
321
322 9b8709d1 Michael Niedermayer
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
323
    while (run >= 33) {
324
        put_bits(&s->pb, 11, 0x008);
325
        run -= 33;
326
    }
327
    put_bits(&s->pb, mbAddrIncrTable[run][1], 
328
             mbAddrIncrTable[run][0]);
329
}
330 de6d9b64 Fabrice Bellard
331
/* insert a fake P picture */
332
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
333
{
334 029911d1 Michael Niedermayer
    assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
335
336 de6d9b64 Fabrice Bellard
    /* mpeg1 picture header */
337
    put_header(s, PICTURE_START_CODE);
338
    /* temporal reference */
339
    put_bits(&s->pb, 10, pict_num & 0x3ff); 
340
    
341
    put_bits(&s->pb, 3, P_TYPE);
342
    put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
343
    
344
    put_bits(&s->pb, 1, 1); /* integer coordinates */
345
    put_bits(&s->pb, 3, 1); /* forward_f_code */
346
    
347
    put_bits(&s->pb, 1, 0); /* extra bit picture */
348
    
349
    /* only one slice */
350
    put_header(s, SLICE_MIN_START_CODE);
351
    put_bits(&s->pb, 5, 1); /* quantizer scale */
352
    put_bits(&s->pb, 1, 0); /* slice extra information */
353
    
354 9b8709d1 Michael Niedermayer
    encode_mb_skip_run(s, 0);
355 de6d9b64 Fabrice Bellard
    
356
    /* empty macroblock */
357
    put_bits(&s->pb, 3, 1); /* motion only */
358
    
359
    /* zero motion x & y */
360
    put_bits(&s->pb, 1, 1); 
361
    put_bits(&s->pb, 1, 1); 
362
363
    /* output a number of empty slice */
364 9b8709d1 Michael Niedermayer
    encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
365 de6d9b64 Fabrice Bellard
    
366
    /* empty macroblock */
367
    put_bits(&s->pb, 3, 1); /* motion only */
368
    
369
    /* zero motion x & y */
370
    put_bits(&s->pb, 1, 1); 
371
    put_bits(&s->pb, 1, 1); 
372
}
373 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
374 de6d9b64 Fabrice Bellard
375 8f8402e4 Michael Niedermayer
static void common_init(MpegEncContext *s)
376 de6d9b64 Fabrice Bellard
{
377 8f8402e4 Michael Niedermayer
    s->y_dc_scale_table=
378
    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
379
}
380 f004ca1c Michael Niedermayer
381 2a250222 Michael Niedermayer
void ff_mpeg1_clean_buffers(MpegEncContext *s){
382
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
383
    s->last_dc[1] = s->last_dc[0];
384
    s->last_dc[2] = s->last_dc[0];
385
    memset(s->last_mv, 0, sizeof(s->last_mv));
386
}
387
388 7604246d Wolfgang Hesseler
#ifdef CONFIG_ENCODERS
389 9b8709d1 Michael Niedermayer
390
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
391
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
392
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
393
    put_bits(&s->pb, 1, 0); /* slice extra information */
394
}
395
396 8f8402e4 Michael Niedermayer
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
397
{
398 de6d9b64 Fabrice Bellard
    mpeg1_encode_sequence_header(s);
399
400
    /* mpeg1 picture header */
401
    put_header(s, PICTURE_START_CODE);
402
    /* temporal reference */
403 63b15e55 Michael Niedermayer
404
    // RAL: s->picture_number instead of s->fake_picture_number
405
    put_bits(&s->pb, 10, (s->picture_number - 
406 de6d9b64 Fabrice Bellard
                          s->gop_picture_number) & 0x3ff); 
407 af469427 Juanjo
    s->fake_picture_number++;
408 de6d9b64 Fabrice Bellard
    
409
    put_bits(&s->pb, 3, s->pict_type);
410
    put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
411
    
412 63b15e55 Michael Niedermayer
    // RAL: Forward f_code also needed for B frames
413
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
414 de6d9b64 Fabrice Bellard
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
415 cb231c48 Michael Niedermayer
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
416
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
417
        else
418
            put_bits(&s->pb, 3, 7); /* forward_f_code */
419 de6d9b64 Fabrice Bellard
    }
420
    
421 63b15e55 Michael Niedermayer
    // RAL: Backward f_code necessary for B frames
422
    if (s->pict_type == B_TYPE) {
423
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
424 cb231c48 Michael Niedermayer
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
425
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
426
        else
427
            put_bits(&s->pb, 3, 7); /* backward_f_code */
428 029911d1 Michael Niedermayer
    }
429 63b15e55 Michael Niedermayer
430 de6d9b64 Fabrice Bellard
    put_bits(&s->pb, 1, 0); /* extra bit picture */
431
    
432 029911d1 Michael Niedermayer
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
433
        put_header(s, EXT_START_CODE);
434
        put_bits(&s->pb, 4, 8); //pic ext
435 cb231c48 Michael Niedermayer
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
436
            put_bits(&s->pb, 4, s->f_code);
437
            put_bits(&s->pb, 4, s->f_code);
438
        }else{
439
            put_bits(&s->pb, 8, 255);
440
        }
441
        if (s->pict_type == B_TYPE) {
442
            put_bits(&s->pb, 4, s->b_code);
443
            put_bits(&s->pb, 4, s->b_code);
444
        }else{
445
            put_bits(&s->pb, 8, 255);
446
        }
447 029911d1 Michael Niedermayer
        put_bits(&s->pb, 2, s->intra_dc_precision);
448
        put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
449
        put_bits(&s->pb, 1, s->top_field_first);
450
        put_bits(&s->pb, 1, s->frame_pred_frame_dct= 1);
451
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
452
        put_bits(&s->pb, 1, s->q_scale_type);
453
        put_bits(&s->pb, 1, s->intra_vlc_format);
454
        put_bits(&s->pb, 1, s->alternate_scan);
455
        put_bits(&s->pb, 1, s->repeat_first_field);
456
        put_bits(&s->pb, 1, s->chroma_420_type=1);
457
        put_bits(&s->pb, 1, s->progressive_frame=1);
458
        put_bits(&s->pb, 1, 0); //composite_display_flag
459
    }
460
    
461 9b8709d1 Michael Niedermayer
    s->mb_y=0;
462
    ff_mpeg1_encode_slice_header(s);
463 de6d9b64 Fabrice Bellard
}
464
465
void mpeg1_encode_mb(MpegEncContext *s,
466
                     DCTELEM block[6][64],
467
                     int motion_x, int motion_y)
468
{
469 9b8709d1 Michael Niedermayer
    int i, cbp;
470
    const int mb_x = s->mb_x;
471
    const int mb_y = s->mb_y;
472
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
473 de6d9b64 Fabrice Bellard
474
    /* compute cbp */
475
    cbp = 0;
476
    for(i=0;i<6;i++) {
477
        if (s->block_last_index[i] >= 0)
478
            cbp |= 1 << (5 - i);
479
    }
480
481 029911d1 Michael Niedermayer
    if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
482 63b15e55 Michael Niedermayer
        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
483
        (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) |
484
        ((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))) {
485 9b8709d1 Michael Niedermayer
        s->mb_skip_run++;
486 d87c0267 Michael Niedermayer
        s->qscale -= s->dquant;
487 49733979 Michael Niedermayer
        s->skip_count++;
488
        s->misc_bits++;
489
        s->last_bits++;
490 de6d9b64 Fabrice Bellard
    } else {
491 9b8709d1 Michael Niedermayer
        if(first_mb){
492
            assert(s->mb_skip_run == 0);
493
            encode_mb_skip_run(s, s->mb_x);
494
        }else{
495
            encode_mb_skip_run(s, s->mb_skip_run);
496 de6d9b64 Fabrice Bellard
        }
497
        
498
        if (s->pict_type == I_TYPE) {
499 d87c0267 Michael Niedermayer
            if(s->dquant && cbp){
500
                put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
501
                put_bits(&s->pb, 5, s->qscale);
502
            }else{
503
                put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
504
                s->qscale -= s->dquant;
505
            }
506 49733979 Michael Niedermayer
            s->misc_bits+= get_bits_diff(s);
507
            s->i_count++;
508 63b15e55 Michael Niedermayer
        } else if (s->mb_intra) {
509
            if(s->dquant && cbp){
510
                put_bits(&s->pb, 6, 0x01);
511
                put_bits(&s->pb, 5, s->qscale);
512
            }else{
513
                put_bits(&s->pb, 5, 0x03);
514
                s->qscale -= s->dquant;
515
            }
516
            s->misc_bits+= get_bits_diff(s);
517
            s->i_count++;
518
            s->last_mv[0][0][0] = 
519
            s->last_mv[0][0][1] = 0;
520
        } else if (s->pict_type == P_TYPE) { 
521 de6d9b64 Fabrice Bellard
                if (cbp != 0) {
522
                    if (motion_x == 0 && motion_y == 0) {
523 d87c0267 Michael Niedermayer
                        if(s->dquant){
524
                            put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
525
                            put_bits(&s->pb, 5, s->qscale);
526
                        }else{
527
                            put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
528
                        }
529 49733979 Michael Niedermayer
                        s->misc_bits+= get_bits_diff(s);
530 de6d9b64 Fabrice Bellard
                        put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
531
                    } else {
532 d87c0267 Michael Niedermayer
                        if(s->dquant){
533
                            put_bits(&s->pb, 5, 2); /* motion + cbp */
534
                            put_bits(&s->pb, 5, s->qscale);
535
                        }else{
536
                            put_bits(&s->pb, 1, 1); /* motion + cbp */
537
                        }
538 49733979 Michael Niedermayer
                        s->misc_bits+= get_bits_diff(s);
539 63b15e55 Michael Niedermayer
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
540
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
541 49733979 Michael Niedermayer
                        s->mv_bits+= get_bits_diff(s);
542 de6d9b64 Fabrice Bellard
                        put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
543
                    }
544
                } else {
545
                    put_bits(&s->pb, 3, 1); /* motion only */
546 63b15e55 Michael Niedermayer
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
547
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
548 d87c0267 Michael Niedermayer
                    s->qscale -= s->dquant;
549 49733979 Michael Niedermayer
                    s->mv_bits+= get_bits_diff(s);
550 de6d9b64 Fabrice Bellard
                }
551 49733979 Michael Niedermayer
                s->f_count++;
552 63b15e55 Michael Niedermayer
        } else
553
            {    // RAL: All the following bloc added for B frames:
554
                if (cbp != 0)
555
                    {    // With coded bloc pattern
556
                    if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
557
                        {    // Bi-directional motion
558
                        if (s->dquant)
559
                            {    // With QScale
560
                            put_bits(&s->pb, 5, 2);
561
                            put_bits(&s->pb, 5, s->qscale);
562
                            }
563
                        else    // Without QScale
564
                            put_bits(&s->pb, 2, 3);
565
                        s->misc_bits += get_bits_diff(s);
566
                        mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
567
                        mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
568
                        mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
569
                        mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
570
                        s->b_count++;
571
                        s->f_count++;
572
                        s->mv_bits += get_bits_diff(s);
573
                        put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
574
                        }
575
                    else if (s->mv_dir == MV_DIR_BACKWARD)
576
                        {    // Backward motion
577
                        if (s->dquant)
578
                            {    // With QScale
579
                            put_bits(&s->pb, 6, 2);
580
                            put_bits(&s->pb, 5, s->qscale);
581
                            }
582
                        else    // Without QScale
583
                            put_bits(&s->pb, 3, 3);
584
                        s->misc_bits += get_bits_diff(s);
585
                        mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code); 
586
                        mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code); 
587
                        s->b_count++;
588
                        s->mv_bits += get_bits_diff(s);
589
                        put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
590
                        }
591
                    else if (s->mv_dir == MV_DIR_FORWARD)
592
                        {    // Forward motion
593
                        if (s->dquant)
594
                            {    // With QScale
595
                            put_bits(&s->pb, 6, 3);
596
                            put_bits(&s->pb, 5, s->qscale);
597
                            }
598
                        else    // Without QScale
599
                            put_bits(&s->pb, 4, 3);
600
                        s->misc_bits += get_bits_diff(s);
601
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); 
602
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); 
603
                        s->f_count++;
604
                        s->mv_bits += get_bits_diff(s);
605
                        put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
606
                        }
607
                    }
608
                else
609
                    {    // No coded bloc pattern
610
                    if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
611 7604246d Wolfgang Hesseler
                        {    // Bi-directional motion 
612 63b15e55 Michael Niedermayer
                        put_bits(&s->pb, 2, 2); /* backward & forward motion */
613
                        mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
614
                        mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
615
                        mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
616
                        mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
617
                        s->b_count++;
618
                        s->f_count++;
619
                        }
620
                    else if (s->mv_dir == MV_DIR_BACKWARD)
621
                        {    // Backward motion
622
                        put_bits(&s->pb, 3, 2); /* backward motion only */
623
                        mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code); 
624
                        mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code); 
625
                        s->b_count++;
626
                        }
627
                    else if (s->mv_dir == MV_DIR_FORWARD)
628
                        {    // Forward motion
629
                        put_bits(&s->pb, 4, 2); /* forward motion only */
630
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); 
631
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); 
632
                        s->f_count++;
633
                        }
634
                    s->qscale -= s->dquant;
635
                    s->mv_bits += get_bits_diff(s);
636
                    }
637
            // End of bloc from RAL
638 de6d9b64 Fabrice Bellard
            }
639
        for(i=0;i<6;i++) {
640
            if (cbp & (1 << (5 - i))) {
641
                mpeg1_encode_block(s, block[i], i);
642
            }
643
        }
644 9b8709d1 Michael Niedermayer
        s->mb_skip_run = 0;
645 49733979 Michael Niedermayer
        if(s->mb_intra)
646
            s->i_tex_bits+= get_bits_diff(s);
647
        else
648
            s->p_tex_bits+= get_bits_diff(s);
649 de6d9b64 Fabrice Bellard
    }
650 63b15e55 Michael Niedermayer
651
    // RAL: By this:
652
    if (s->mv_dir & MV_DIR_FORWARD)
653
        {
654
        s->last_mv[0][0][0]= s->mv[0][0][0];
655
        s->last_mv[0][0][1]= s->mv[0][0][1];
656
        }
657
    if (s->mv_dir & MV_DIR_BACKWARD)
658
        {
659
        s->last_mv[1][0][0]= s->mv[1][0][0];
660
        s->last_mv[1][0][1]= s->mv[1][0][1];
661
        }
662 de6d9b64 Fabrice Bellard
}
663
664 63b15e55 Michael Niedermayer
// RAL: Parameter added: f_or_b_code
665
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
666 de6d9b64 Fabrice Bellard
{
667
    int code, bit_size, l, m, bits, range, sign;
668
669
    if (val == 0) {
670
        /* zero vector */
671
        code = 0;
672
        put_bits(&s->pb,
673
                 mbMotionVectorTable[0][1], 
674
                 mbMotionVectorTable[0][0]); 
675
    } else {
676 63b15e55 Michael Niedermayer
        bit_size = f_or_b_code - 1;
677 de6d9b64 Fabrice Bellard
        range = 1 << bit_size;
678
        /* modulo encoding */
679
        l = 16 * range;
680
        m = 2 * l;
681
        if (val < -l) {
682
            val += m;
683
        } else if (val >= l) {
684
            val -= m;
685
        }
686
687
        if (val >= 0) {
688
            val--;
689
            code = (val >> bit_size) + 1;
690
            bits = val & (range - 1);
691
            sign = 0;
692
        } else {
693
            val = -val;
694
            val--;
695
            code = (val >> bit_size) + 1;
696
            bits = val & (range - 1);
697
            sign = 1;
698
        }
699 63b15e55 Michael Niedermayer
700
        assert(code > 0 && code <= 16);
701
702 de6d9b64 Fabrice Bellard
        put_bits(&s->pb,
703
                 mbMotionVectorTable[code][1], 
704
                 mbMotionVectorTable[code][0]); 
705 63b15e55 Michael Niedermayer
706 de6d9b64 Fabrice Bellard
        put_bits(&s->pb, 1, sign);
707
        if (bit_size > 0) {
708
            put_bits(&s->pb, bit_size, bits);
709
        }
710
    }
711
}
712
713 8f8402e4 Michael Niedermayer
void ff_mpeg1_encode_init(MpegEncContext *s)
714 11ce8834 Michael Niedermayer
{
715
    static int done=0;
716 8f8402e4 Michael Niedermayer
717
    common_init(s);
718
719 11ce8834 Michael Niedermayer
    if(!done){
720
        int f_code;
721
        int mv;
722 8f8402e4 Michael Niedermayer
        int i;
723 11ce8834 Michael Niedermayer
724
        done=1;
725 8f8402e4 Michael Niedermayer
        init_rl(&rl_mpeg1);
726 c442d75c Michael Niedermayer
727 8f8402e4 Michael Niedermayer
        for(i=0; i<64; i++)
728
        {
729
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
730
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
731
        }
732 c442d75c Michael Niedermayer
        
733
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
734 8f8402e4 Michael Niedermayer
735
        /* build unified dc encoding tables */
736
        for(i=-255; i<256; i++)
737
        {
738
                int adiff, index;
739
                int bits, code;
740
                int diff=i;
741
742
                adiff = ABS(diff);
743
                if(diff<0) diff--;
744
                index = vlc_dc_table[adiff];
745
746
                bits= vlc_dc_lum_bits[index] + index;
747
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
748
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
749
                
750
                bits= vlc_dc_chroma_bits[index] + index;
751
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
752
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
753
        }
754
755 30952237 Michael Niedermayer
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
756
757 11ce8834 Michael Niedermayer
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
758
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
759
                int len;
760
761
                if(mv==0) len= mbMotionVectorTable[0][1];
762
                else{
763
                    int val, bit_size, range, code;
764
765
                    bit_size = s->f_code - 1;
766
                    range = 1 << bit_size;
767
768
                    val=mv;
769
                    if (val < 0) 
770
                        val = -val;
771
                    val--;
772
                    code = (val >> bit_size) + 1;
773
                    if(code<17){
774
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
775
                    }else{
776
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
777
                    }
778
                }
779
780
                mv_penalty[f_code][mv+MAX_MV]= len;
781
            }
782
        }
783
        
784
785
        for(f_code=MAX_FCODE; f_code>0; f_code--){
786
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
787
                fcode_tab[mv+MAX_MV]= f_code;
788
            }
789
        }
790
    }
791 1457ab52 Michael Niedermayer
    s->me.mv_penalty= mv_penalty;
792 11ce8834 Michael Niedermayer
    s->fcode_tab= fcode_tab;
793 029911d1 Michael Niedermayer
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
794
        s->min_qcoeff=-255;
795
        s->max_qcoeff= 255;
796
    }else{
797
        s->min_qcoeff=-2047;
798
        s->max_qcoeff= 2047;
799
    }
800 c442d75c Michael Niedermayer
    s->intra_ac_vlc_length=
801 e5021fff Michael Niedermayer
    s->inter_ac_vlc_length=
802
    s->intra_ac_vlc_last_length=
803
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
804 11ce8834 Michael Niedermayer
}
805 8f8402e4 Michael Niedermayer
806 de6d9b64 Fabrice Bellard
static inline void encode_dc(MpegEncContext *s, int diff, int component)
807
{
808
    if (component == 0) {
809 f004ca1c Michael Niedermayer
        put_bits(
810
            &s->pb, 
811
            mpeg1_lum_dc_uni[diff+255]&0xFF,
812
            mpeg1_lum_dc_uni[diff+255]>>8);
813 de6d9b64 Fabrice Bellard
    } else {
814 f004ca1c Michael Niedermayer
        put_bits(
815
            &s->pb, 
816
            mpeg1_chr_dc_uni[diff+255]&0xFF,
817
            mpeg1_chr_dc_uni[diff+255]>>8);
818 de6d9b64 Fabrice Bellard
    }
819
}
820
821
static void mpeg1_encode_block(MpegEncContext *s, 
822
                               DCTELEM *block, 
823
                               int n)
824
{
825
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
826
    int code, component;
827 80feb2a2 Michael Niedermayer
//    RLTable *rl = &rl_mpeg1;
828 de6d9b64 Fabrice Bellard
829
    last_index = s->block_last_index[n];
830
831
    /* DC coef */
832
    if (s->mb_intra) {
833
        component = (n <= 3 ? 0 : n - 4 + 1);
834
        dc = block[0]; /* overflow is impossible */
835
        diff = dc - s->last_dc[component];
836
        encode_dc(s, diff, component);
837
        s->last_dc[component] = dc;
838
        i = 1;
839 029911d1 Michael Niedermayer
/*
840
        if (s->intra_vlc_format)
841
            rl = &rl_mpeg2;
842
        else
843
            rl = &rl_mpeg1;
844
*/
845 de6d9b64 Fabrice Bellard
    } else {
846
        /* encode the first coefficient : needs to be done here because
847
           it is handled slightly differently */
848
        level = block[0];
849
        if (abs(level) == 1) {
850 0c1a9eda Zdenek Kabelac
                code = ((uint32_t)level >> 31); /* the sign bit */
851 de6d9b64 Fabrice Bellard
                put_bits(&s->pb, 2, code | 0x02);
852
                i = 1;
853
        } else {
854
            i = 0;
855
            last_non_zero = -1;
856
            goto next_coef;
857
        }
858
    }
859
860
    /* now quantify & encode AC coefs */
861
    last_non_zero = i - 1;
862 80feb2a2 Michael Niedermayer
863 de6d9b64 Fabrice Bellard
    for(;i<=last_index;i++) {
864 2ad1516a Michael Niedermayer
        j = s->intra_scantable.permutated[i];
865 de6d9b64 Fabrice Bellard
        level = block[j];
866
    next_coef:
867
#if 0
868
        if (level != 0)
869
            dprintf("level[%d]=%d\n", i, level);
870
#endif            
871
        /* encode using VLC */
872
        if (level != 0) {
873
            run = i - last_non_zero - 1;
874 2ad1516a Michael Niedermayer
            
875
            alevel= level;
876
            MASK_ABS(sign, alevel)
877
            sign&=1;
878
879 80feb2a2 Michael Niedermayer
//            code = get_rl_index(rl, 0, run, alevel);
880 c442d75c Michael Niedermayer
            if (alevel <= mpeg1_max_level[0][run]){
881 80feb2a2 Michael Niedermayer
                code= mpeg1_index_run[0][run] + alevel - 1;
882
                    /* store the vlc & sign at once */
883
                put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
884 de6d9b64 Fabrice Bellard
            } else {
885 80feb2a2 Michael Niedermayer
                /* escape seems to be pretty rare <5% so i dont optimize it */
886
                put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
887 de6d9b64 Fabrice Bellard
                /* escape: only clip in this case */
888
                put_bits(&s->pb, 6, run);
889 029911d1 Michael Niedermayer
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
890
                    if (alevel < 128) {
891
                        put_bits(&s->pb, 8, level & 0xff);
892 de6d9b64 Fabrice Bellard
                    } else {
893 029911d1 Michael Niedermayer
                        if (level < 0) {
894
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
895
                        } else {
896
                            put_bits(&s->pb, 16, level & 0xffff);
897
                        }
898 de6d9b64 Fabrice Bellard
                    }
899 029911d1 Michael Niedermayer
                }else{
900
                    put_bits(&s->pb, 12, level & 0xfff);
901 de6d9b64 Fabrice Bellard
                }
902
            }
903
            last_non_zero = i;
904
        }
905
    }
906
    /* end of block */
907
    put_bits(&s->pb, 2, 0x2);
908
}
909 7604246d Wolfgang Hesseler
#endif //CONFIG_ENCODERS
910 de6d9b64 Fabrice Bellard
911
/******************************************/
912
/* decoding */
913
914
static VLC dc_lum_vlc;
915
static VLC dc_chroma_vlc;
916
static VLC mv_vlc;
917
static VLC mbincr_vlc;
918
static VLC mb_ptype_vlc;
919
static VLC mb_btype_vlc;
920
static VLC mb_pat_vlc;
921
922 c3bf0288 Michael Niedermayer
static void init_vlcs()
923 de6d9b64 Fabrice Bellard
{
924
    static int done = 0;
925
926
    if (!done) {
927 915bbac6 Fabrice Bellard
        done = 1;
928 de6d9b64 Fabrice Bellard
929 9ac7ecd6 Michael Niedermayer
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
930 de6d9b64 Fabrice Bellard
                 vlc_dc_lum_bits, 1, 1,
931
                 vlc_dc_lum_code, 2, 2);
932 9ac7ecd6 Michael Niedermayer
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
933 de6d9b64 Fabrice Bellard
                 vlc_dc_chroma_bits, 1, 1,
934
                 vlc_dc_chroma_code, 2, 2);
935 8ed2ddb2 Michael Niedermayer
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
936 de6d9b64 Fabrice Bellard
                 &mbMotionVectorTable[0][1], 2, 1,
937
                 &mbMotionVectorTable[0][0], 2, 1);
938 9c00c3af Michael Niedermayer
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
939 de6d9b64 Fabrice Bellard
                 &mbAddrIncrTable[0][1], 2, 1,
940
                 &mbAddrIncrTable[0][0], 2, 1);
941 8ed2ddb2 Michael Niedermayer
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63, 
942 de6d9b64 Fabrice Bellard
                 &mbPatTable[0][1], 2, 1,
943
                 &mbPatTable[0][0], 2, 1);
944
        
945 7bc9090a Michael Niedermayer
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
946 de6d9b64 Fabrice Bellard
                 &table_mb_ptype[0][1], 2, 1,
947
                 &table_mb_ptype[0][0], 2, 1);
948 7bc9090a Michael Niedermayer
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
949 de6d9b64 Fabrice Bellard
                 &table_mb_btype[0][1], 2, 1,
950
                 &table_mb_btype[0][0], 2, 1);
951
        init_rl(&rl_mpeg1);
952
        init_rl(&rl_mpeg2);
953 4f68b084 Michael Niedermayer
954
        init_2d_vlc_rl(&rl_mpeg1);
955
        init_2d_vlc_rl(&rl_mpeg2);
956 de6d9b64 Fabrice Bellard
    }
957
}
958
959
static inline int get_dmv(MpegEncContext *s)
960
{
961 612476ef Arpi
    if(get_bits1(&s->gb)) 
962
        return 1 - (get_bits1(&s->gb) << 1);
963 de6d9b64 Fabrice Bellard
    else
964
        return 0;
965
}
966
967 0ee50938 Fabrice Bellard
static inline int get_qscale(MpegEncContext *s)
968
{
969 7062fad6 BERO
    int qscale = get_bits(&s->gb, 5);
970 029911d1 Michael Niedermayer
    if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
971 0ee50938 Fabrice Bellard
        if (s->q_scale_type) {
972 7062fad6 BERO
            return non_linear_qscale[qscale];
973 0ee50938 Fabrice Bellard
        } else {
974 7062fad6 BERO
            return qscale << 1;
975 0ee50938 Fabrice Bellard
        }
976
    }
977
    return qscale;
978
}
979
980 de6d9b64 Fabrice Bellard
/* motion type (for mpeg2) */
981
#define MT_FIELD 1
982
#define MT_FRAME 2
983
#define MT_16X8  2
984
#define MT_DMV   3
985
986
static int mpeg_decode_mb(MpegEncContext *s,
987
                          DCTELEM block[6][64])
988
{
989 d2975f8d Michael Niedermayer
    int i, j, k, cbp, val, mb_type, motion_type;
990 de6d9b64 Fabrice Bellard
    
991
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
992
993 f943e138 Michael Niedermayer
    assert(s->mb_skiped==0);
994
995 9b8709d1 Michael Niedermayer
    if (s->mb_skip_run-- != 0) {
996 7bc9090a Michael Niedermayer
        if(s->pict_type == I_TYPE){
997 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
998 7bc9090a Michael Niedermayer
            return -1;
999
        }
1000
    
1001 de6d9b64 Fabrice Bellard
        /* skip mb */
1002
        s->mb_intra = 0;
1003
        for(i=0;i<6;i++)
1004
            s->block_last_index[i] = -1;
1005
        s->mv_type = MV_TYPE_16X16;
1006
        if (s->pict_type == P_TYPE) {
1007
            /* if P type, zero motion vector is implied */
1008
            s->mv_dir = MV_DIR_FORWARD;
1009
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1010
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1011 25ed7f92 Fabrice Bellard
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1012 f943e138 Michael Niedermayer
            s->mb_skiped = 1;
1013 7bc9090a Michael Niedermayer
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1014 de6d9b64 Fabrice Bellard
        } else {
1015
            /* if B type, reuse previous vectors and directions */
1016
            s->mv[0][0][0] = s->last_mv[0][0][0];
1017
            s->mv[0][0][1] = s->last_mv[0][0][1];
1018
            s->mv[1][0][0] = s->last_mv[1][0][0];
1019
            s->mv[1][0][1] = s->last_mv[1][0][1];
1020 f943e138 Michael Niedermayer
1021 7bc9090a Michael Niedermayer
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1022
                s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1023
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1024
1025 f943e138 Michael Niedermayer
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1026
                s->mb_skiped = 1;
1027 de6d9b64 Fabrice Bellard
        }
1028 59b571c1 Michael Niedermayer
1029 de6d9b64 Fabrice Bellard
        return 0;
1030
    }
1031
1032
    switch(s->pict_type) {
1033
    default:
1034
    case I_TYPE:
1035 612476ef Arpi
        if (get_bits1(&s->gb) == 0) {
1036 e94bc100 Michael Niedermayer
            if (get_bits1(&s->gb) == 0){
1037 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1038 de6d9b64 Fabrice Bellard
                return -1;
1039 e94bc100 Michael Niedermayer
            }
1040 7bc9090a Michael Niedermayer
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1041 de6d9b64 Fabrice Bellard
        } else {
1042 7bc9090a Michael Niedermayer
            mb_type = MB_TYPE_INTRA;
1043 de6d9b64 Fabrice Bellard
        }
1044
        break;
1045
    case P_TYPE:
1046 8ed2ddb2 Michael Niedermayer
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1047 9ac7ecd6 Michael Niedermayer
        if (mb_type < 0){
1048 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1049 de6d9b64 Fabrice Bellard
            return -1;
1050 9ac7ecd6 Michael Niedermayer
        }
1051 7bc9090a Michael Niedermayer
        mb_type = ptype2mb_type[ mb_type ];
1052 de6d9b64 Fabrice Bellard
        break;
1053
    case B_TYPE:
1054 8ed2ddb2 Michael Niedermayer
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1055 9ac7ecd6 Michael Niedermayer
        if (mb_type < 0){
1056 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1057 de6d9b64 Fabrice Bellard
            return -1;
1058 9ac7ecd6 Michael Niedermayer
        }
1059 7bc9090a Michael Niedermayer
        mb_type = btype2mb_type[ mb_type ];
1060 de6d9b64 Fabrice Bellard
        break;
1061
    }
1062
    dprintf("mb_type=%x\n", mb_type);
1063 7bc9090a Michael Niedermayer
//    motion_type = 0; /* avoid warning */
1064
    if (IS_INTRA(mb_type)) {
1065
        /* compute dct type */
1066
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1067
            !s->frame_pred_frame_dct) {
1068
            s->interlaced_dct = get_bits1(&s->gb);
1069
        }
1070 de6d9b64 Fabrice Bellard
1071 7bc9090a Michael Niedermayer
        if (IS_QUANT(mb_type))
1072
            s->qscale = get_qscale(s);
1073
        
1074 de6d9b64 Fabrice Bellard
        if (s->concealment_motion_vectors) {
1075
            /* just parse them */
1076
            if (s->picture_structure != PICT_FRAME) 
1077 612476ef Arpi
                skip_bits1(&s->gb); /* field select */
1078 daab3296 Michael Niedermayer
            
1079
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1080
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1081
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1082
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1083
1084 7bc9090a Michael Niedermayer
            skip_bits1(&s->gb); /* marker */
1085 daab3296 Michael Niedermayer
        }else
1086
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1087 de6d9b64 Fabrice Bellard
        s->mb_intra = 1;
1088 a579db0c Ivan Kalvachev
#ifdef HAVE_XVMC
1089
        //one 1 we memcpy blocks in xvmcvideo
1090
        if(s->avctx->xvmc_acceleration > 1){
1091
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1092
            if(s->swap_uv){
1093
                exchange_uv(s);
1094
            }
1095
        }
1096
#endif
1097 7bc9090a Michael Niedermayer
1098 029911d1 Michael Niedermayer
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1099 7bc9090a Michael Niedermayer
            for(i=0;i<6;i++) {
1100 a579db0c Ivan Kalvachev
                if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1101 7bc9090a Michael Niedermayer
                    return -1;
1102
            }
1103
        } else {
1104
            for(i=0;i<6;i++) {
1105 a579db0c Ivan Kalvachev
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1106 7bc9090a Michael Niedermayer
                    return -1;
1107
            }
1108
        }
1109 de6d9b64 Fabrice Bellard
    } else {
1110 7bc9090a Michael Niedermayer
        if (mb_type & MB_TYPE_ZERO_MV){
1111
            assert(mb_type & MB_TYPE_PAT);
1112
1113
            /* compute dct type */
1114
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1115
                !s->frame_pred_frame_dct) {
1116
                s->interlaced_dct = get_bits1(&s->gb);
1117
            }
1118
1119
            if (IS_QUANT(mb_type))
1120
                s->qscale = get_qscale(s);
1121
1122
            s->mv_dir = MV_DIR_FORWARD;
1123
            s->mv_type = MV_TYPE_16X16;
1124
            s->last_mv[0][0][0] = 0;
1125
            s->last_mv[0][0][1] = 0;
1126
            s->last_mv[0][1][0] = 0;
1127
            s->last_mv[0][1][1] = 0;
1128
            s->mv[0][0][0] = 0;
1129
            s->mv[0][0][1] = 0;
1130
        }else{
1131
            assert(mb_type & MB_TYPE_L0L1);
1132
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1133
            /* get additionnal motion vector type */
1134
            if (s->frame_pred_frame_dct) 
1135
                motion_type = MT_FRAME;
1136
            else{
1137
                motion_type = get_bits(&s->gb, 2);
1138
            }
1139
1140
            /* compute dct type */
1141
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1142
                !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1143
                s->interlaced_dct = get_bits1(&s->gb);
1144
            }
1145
1146
            if (IS_QUANT(mb_type))
1147
                s->qscale = get_qscale(s);
1148
1149
            /* motion vectors */
1150
            s->mv_dir = 0;
1151
            for(i=0;i<2;i++) {
1152
                if (USES_LIST(mb_type, i)) {
1153
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1154
                    dprintf("motion_type=%d\n", motion_type);
1155
                    switch(motion_type) {
1156
                    case MT_FRAME: /* or MT_16X8 */
1157
                        if (s->picture_structure == PICT_FRAME) {
1158
                            /* MT_FRAME */
1159
                            mb_type |= MB_TYPE_16x16; 
1160
                            s->mv_type = MV_TYPE_16X16;
1161
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1162
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1163
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1164
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1165 de6d9b64 Fabrice Bellard
                            /* full_pel: only for mpeg1 */
1166 7bc9090a Michael Niedermayer
                            if (s->full_pel[i]){
1167
                                s->mv[i][0][0] <<= 1;
1168
                                s->mv[i][0][1] <<= 1;
1169
                            }
1170
                        } else {
1171
                            /* MT_16X8 */
1172
                            mb_type |= MB_TYPE_16x8; 
1173
                            s->mv_type = MV_TYPE_16X8;
1174
                            for(j=0;j<2;j++) {
1175
                                s->field_select[i][j] = get_bits1(&s->gb);
1176
                                for(k=0;k<2;k++) {
1177
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1178
                                                             s->last_mv[i][j][k]);
1179
                                    s->last_mv[i][j][k] = val;
1180
                                    s->mv[i][j][k] = val;
1181
                                }
1182
                            }
1183 de6d9b64 Fabrice Bellard
                        }
1184 7bc9090a Michael Niedermayer
                        break;
1185
                    case MT_FIELD:
1186
                        s->mv_type = MV_TYPE_FIELD;
1187
                        if (s->picture_structure == PICT_FRAME) {
1188
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1189
                            for(j=0;j<2;j++) {
1190
                                s->field_select[i][j] = get_bits1(&s->gb);
1191
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1192
                                                         s->last_mv[i][j][0]);
1193
                                s->last_mv[i][j][0] = val;
1194
                                s->mv[i][j][0] = val;
1195
                                dprintf("fmx=%d\n", val);
1196
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1197
                                                         s->last_mv[i][j][1] >> 1);
1198
                                s->last_mv[i][j][1] = val << 1;
1199
                                s->mv[i][j][1] = val;
1200
                                dprintf("fmy=%d\n", val);
1201
                            }
1202
                        } else {
1203
                            mb_type |= MB_TYPE_16x16; 
1204
                            s->field_select[i][0] = get_bits1(&s->gb);
1205 de6d9b64 Fabrice Bellard
                            for(k=0;k<2;k++) {
1206
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1207 7bc9090a Michael Niedermayer
                                                         s->last_mv[i][0][k]);
1208
                                s->last_mv[i][0][k] = val;
1209
                                s->last_mv[i][1][k] = val;
1210
                                s->mv[i][0][k] = val;
1211 de6d9b64 Fabrice Bellard
                            }
1212
                        }
1213 7bc9090a Michael Niedermayer
                        break;
1214
                    case MT_DMV:
1215
                        {
1216
                            int dmx, dmy, mx, my, m;
1217
1218
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1219
                                                    s->last_mv[i][0][0]);
1220
                            s->last_mv[i][0][0] = mx;
1221
                            s->last_mv[i][1][0] = mx;
1222
                            dmx = get_dmv(s);
1223
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1224
                                                    s->last_mv[i][0][1] >> 1);
1225
                            dmy = get_dmv(s);
1226
                            s->mv_type = MV_TYPE_DMV;
1227 1dff7d56 Ivan Kalvachev
1228
1229
                            s->last_mv[i][0][1] = my<<1;
1230
                            s->last_mv[i][1][1] = my<<1;
1231
1232
                            s->mv[i][0][0] = mx;
1233
                            s->mv[i][0][1] = my;
1234
                            s->mv[i][1][0] = mx;//not used
1235
                            s->mv[i][1][1] = my;//not used
1236
1237 7bc9090a Michael Niedermayer
                            if (s->picture_structure == PICT_FRAME) {
1238
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1239
1240 1dff7d56 Ivan Kalvachev
                                //m = 1 + 2 * s->top_field_first;
1241 7bc9090a Michael Niedermayer
                                m = s->top_field_first ? 1 : 3;
1242 1dff7d56 Ivan Kalvachev
1243 7bc9090a Michael Niedermayer
                                /* top -> top pred */
1244 1dff7d56 Ivan Kalvachev
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1245
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1246 7bc9090a Michael Niedermayer
                                m = 4 - m;
1247
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1248
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1249
                            } else {
1250
                                mb_type |= MB_TYPE_16x16;
1251
1252 1dff7d56 Ivan Kalvachev
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1253
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1254
                                if(s->picture_structure == PICT_TOP_FIELD)
1255
                                    s->mv[i][2][1]--;
1256
                                else 
1257
                                    s->mv[i][2][1]++;
1258 7bc9090a Michael Niedermayer
                            }
1259 de6d9b64 Fabrice Bellard
                        }
1260 7bc9090a Michael Niedermayer
                        break;
1261 de6d9b64 Fabrice Bellard
                    }
1262
                }
1263
            }
1264
        }
1265 7bc9090a Michael Niedermayer
        
1266
        s->mb_intra = 0;
1267 de6d9b64 Fabrice Bellard
1268 7bc9090a Michael Niedermayer
        if (IS_PAT(mb_type)) {
1269
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1270
            if (cbp < 0){
1271 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1272 7bc9090a Michael Niedermayer
                return -1;
1273 de6d9b64 Fabrice Bellard
            }
1274 7bc9090a Michael Niedermayer
            cbp++;
1275
1276 a579db0c Ivan Kalvachev
#ifdef HAVE_XVMC
1277
            //on 1 we memcpy blocks in xvmcvideo
1278
            if(s->avctx->xvmc_acceleration > 1){
1279
                XVMC_pack_pblocks(s,cbp);
1280
                if(s->swap_uv){
1281
                    exchange_uv(s);
1282
                }
1283
            }    
1284
#endif
1285
1286 029911d1 Michael Niedermayer
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1287 7bc9090a Michael Niedermayer
                for(i=0;i<6;i++) {
1288
                    if (cbp & 32) {
1289 a579db0c Ivan Kalvachev
                        if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1290 7bc9090a Michael Niedermayer
                            return -1;
1291
                    } else {
1292
                        s->block_last_index[i] = -1;
1293
                    }
1294
                    cbp+=cbp;
1295 de6d9b64 Fabrice Bellard
                }
1296 7bc9090a Michael Niedermayer
            } else {
1297
                for(i=0;i<6;i++) {
1298
                    if (cbp & 32) {
1299 a579db0c Ivan Kalvachev
                        if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1300 7bc9090a Michael Niedermayer
                            return -1;
1301
                    } else {
1302
                        s->block_last_index[i] = -1;
1303
                    }
1304
                    cbp+=cbp;
1305 a0201736 Michael Niedermayer
                }
1306 de6d9b64 Fabrice Bellard
            }
1307 7bc9090a Michael Niedermayer
        }else{
1308
            for(i=0;i<6;i++)
1309
                s->block_last_index[i] = -1;
1310 de6d9b64 Fabrice Bellard
        }
1311
    }
1312 7bc9090a Michael Niedermayer
1313
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1314
1315 de6d9b64 Fabrice Bellard
    return 0;
1316
}
1317
1318
/* as h263, but only 17 codes */
1319
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1320
{
1321 05858889 BERO
    int code, sign, val, l, shift;
1322 de6d9b64 Fabrice Bellard
1323 8ed2ddb2 Michael Niedermayer
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1324 de6d9b64 Fabrice Bellard
    if (code == 0) {
1325
        return pred;
1326
    }
1327 7bc9090a Michael Niedermayer
    if (code < 0) {
1328
        return 0xffff;
1329
    }
1330
1331 612476ef Arpi
    sign = get_bits1(&s->gb);
1332 de6d9b64 Fabrice Bellard
    shift = fcode - 1;
1333 05858889 BERO
    val = code;
1334
    if (shift) {
1335
        val = (val - 1) << shift;
1336 de6d9b64 Fabrice Bellard
        val |= get_bits(&s->gb, shift);
1337 05858889 BERO
        val++;
1338
    }
1339 de6d9b64 Fabrice Bellard
    if (sign)
1340
        val = -val;
1341
    val += pred;
1342
    
1343
    /* modulo decoding */
1344 7bc9090a Michael Niedermayer
    l = 1 << (shift+4);
1345 05858889 BERO
    val = ((val + l)&(l*2-1)) - l;
1346 de6d9b64 Fabrice Bellard
    return val;
1347
}
1348
1349 c3bf0288 Michael Niedermayer
static inline int decode_dc(GetBitContext *gb, int component)
1350 de6d9b64 Fabrice Bellard
{
1351
    int code, diff;
1352
1353
    if (component == 0) {
1354 c3bf0288 Michael Niedermayer
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1355 de6d9b64 Fabrice Bellard
    } else {
1356 c3bf0288 Michael Niedermayer
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1357 de6d9b64 Fabrice Bellard
    }
1358 9ac7ecd6 Michael Niedermayer
    if (code < 0){
1359 9b879566 Michel Bardiaux
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1360 de6d9b64 Fabrice Bellard
        return 0xffff;
1361 9ac7ecd6 Michael Niedermayer
    }
1362 de6d9b64 Fabrice Bellard
    if (code == 0) {
1363
        diff = 0;
1364
    } else {
1365 c3bf0288 Michael Niedermayer
        diff = get_xbits(gb, code);
1366 de6d9b64 Fabrice Bellard
    }
1367
    return diff;
1368
}
1369
1370 a0201736 Michael Niedermayer
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1371 de6d9b64 Fabrice Bellard
                               DCTELEM *block, 
1372
                               int n)
1373
{
1374
    int level, dc, diff, i, j, run;
1375 a0201736 Michael Niedermayer
    int component;
1376 de6d9b64 Fabrice Bellard
    RLTable *rl = &rl_mpeg1;
1377 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1378
    const uint16_t *quant_matrix= s->intra_matrix;
1379 a0201736 Michael Niedermayer
    const int qscale= s->qscale;
1380 de6d9b64 Fabrice Bellard
1381 a0201736 Michael Niedermayer
    /* DC coef */
1382
    component = (n <= 3 ? 0 : n - 4 + 1);
1383 c3bf0288 Michael Niedermayer
    diff = decode_dc(&s->gb, component);
1384 a0201736 Michael Niedermayer
    if (diff >= 0xffff)
1385
        return -1;
1386
    dc = s->last_dc[component];
1387
    dc += diff;
1388
    s->last_dc[component] = dc;
1389
    block[0] = dc<<3;
1390
    dprintf("dc=%d diff=%d\n", dc, diff);
1391
    i = 0;
1392
    {
1393
        OPEN_READER(re, &s->gb);    
1394
        /* now quantify & encode AC coefs */
1395
        for(;;) {
1396
            UPDATE_CACHE(re, &s->gb);
1397
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1398
            
1399
            if(level == 127){
1400
                break;
1401
            } else if(level != 0) {
1402
                i += run;
1403
                j = scantable[i];
1404
                level= (level*qscale*quant_matrix[j])>>3;
1405
                level= (level-1)|1;
1406
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1407
                LAST_SKIP_BITS(re, &s->gb, 1);
1408
            } else {
1409
                /* escape */
1410
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1411
                UPDATE_CACHE(re, &s->gb);
1412
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1413
                if (level == -128) {
1414
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1415
                } else if (level == 0) {
1416
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1417
                }
1418
                i += run;
1419
                j = scantable[i];
1420
                if(level<0){
1421
                    level= -level;
1422
                    level= (level*qscale*quant_matrix[j])>>3;
1423
                    level= (level-1)|1;
1424
                    level= -level;
1425
                }else{
1426
                    level= (level*qscale*quant_matrix[j])>>3;
1427
                    level= (level-1)|1;
1428
                }
1429
            }
1430
            if (i > 63){
1431 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1432 a0201736 Michael Niedermayer
                return -1;
1433
            }
1434
1435
            block[j] = level;
1436
        }
1437
        CLOSE_READER(re, &s->gb);
1438
    }
1439
    s->block_last_index[n] = i;
1440
   return 0;
1441
}
1442
1443
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1444
                               DCTELEM *block, 
1445
                               int n)
1446
{
1447
    int level, i, j, run;
1448
    RLTable *rl = &rl_mpeg1;
1449 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1450
    const uint16_t *quant_matrix= s->inter_matrix;
1451 a0201736 Michael Niedermayer
    const int qscale= s->qscale;
1452
1453
    {
1454 8db1a1dd Michael Niedermayer
        int v;
1455
        OPEN_READER(re, &s->gb);
1456 a0201736 Michael Niedermayer
        i = -1;
1457 de6d9b64 Fabrice Bellard
        /* special case for the first coef. no need to add a second vlc table */
1458 8db1a1dd Michael Niedermayer
        UPDATE_CACHE(re, &s->gb);
1459
        v= SHOW_UBITS(re, &s->gb, 2);
1460 de6d9b64 Fabrice Bellard
        if (v & 2) {
1461 3729c912 Michael Niedermayer
            LAST_SKIP_BITS(re, &s->gb, 2);
1462 a0201736 Michael Niedermayer
            level= (3*qscale*quant_matrix[0])>>4;
1463
            level= (level-1)|1;
1464
            if(v&1)
1465
                level= -level;
1466 3729c912 Michael Niedermayer
            block[0] = level;
1467 a0201736 Michael Niedermayer
            i++;
1468 de6d9b64 Fabrice Bellard
        }
1469 3729c912 Michael Niedermayer
1470 a0201736 Michael Niedermayer
        /* now quantify & encode AC coefs */
1471
        for(;;) {
1472
            UPDATE_CACHE(re, &s->gb);
1473
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1474
            
1475
            if(level == 127){
1476
                break;
1477
            } else if(level != 0) {
1478
                i += run;
1479
                j = scantable[i];
1480
                level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1481
                level= (level-1)|1;
1482
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1483
                LAST_SKIP_BITS(re, &s->gb, 1);
1484
            } else {
1485
                /* escape */
1486
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1487
                UPDATE_CACHE(re, &s->gb);
1488
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1489
                if (level == -128) {
1490
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1491
                } else if (level == 0) {
1492
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1493
                }
1494
                i += run;
1495
                j = scantable[i];
1496
                if(level<0){
1497
                    level= -level;
1498
                    level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1499
                    level= (level-1)|1;
1500
                    level= -level;
1501
                }else{
1502
                    level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1503
                    level= (level-1)|1;
1504
                }
1505 de6d9b64 Fabrice Bellard
            }
1506 a0201736 Michael Niedermayer
            if (i > 63){
1507 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1508 a0201736 Michael Niedermayer
                return -1;
1509
            }
1510
1511
            block[j] = level;
1512 de6d9b64 Fabrice Bellard
        }
1513 a0201736 Michael Niedermayer
        CLOSE_READER(re, &s->gb);
1514 de6d9b64 Fabrice Bellard
    }
1515 a0201736 Michael Niedermayer
    s->block_last_index[n] = i;
1516 de6d9b64 Fabrice Bellard
    return 0;
1517
}
1518
1519
/* Also does unquantization here, since I will never support mpeg2
1520
   encoding */
1521 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1522
                               DCTELEM *block, 
1523
                               int n)
1524 de6d9b64 Fabrice Bellard
{
1525
    int level, i, j, run;
1526
    RLTable *rl = &rl_mpeg1;
1527 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1528
    const uint16_t *quant_matrix;
1529 3729c912 Michael Niedermayer
    const int qscale= s->qscale;
1530 de6d9b64 Fabrice Bellard
    int mismatch;
1531
1532
    mismatch = 1;
1533
1534
    {
1535 8db1a1dd Michael Niedermayer
        int v;
1536
        OPEN_READER(re, &s->gb);
1537 3729c912 Michael Niedermayer
        i = -1;
1538 8db1a1dd Michael Niedermayer
        if (n < 4)
1539 3729c912 Michael Niedermayer
            quant_matrix = s->inter_matrix;
1540 de6d9b64 Fabrice Bellard
        else
1541 3729c912 Michael Niedermayer
            quant_matrix = s->chroma_inter_matrix;
1542 8db1a1dd Michael Niedermayer
1543 de6d9b64 Fabrice Bellard
        /* special case for the first coef. no need to add a second vlc table */
1544 8db1a1dd Michael Niedermayer
        UPDATE_CACHE(re, &s->gb);
1545
        v= SHOW_UBITS(re, &s->gb, 2);
1546 de6d9b64 Fabrice Bellard
        if (v & 2) {
1547 3729c912 Michael Niedermayer
            LAST_SKIP_BITS(re, &s->gb, 2);
1548
            level= (3*qscale*quant_matrix[0])>>5;
1549
            if(v&1)
1550
                level= -level;
1551
            block[0] = level;
1552
            mismatch ^= level;
1553
            i++;
1554 de6d9b64 Fabrice Bellard
        }
1555
1556 3729c912 Michael Niedermayer
        /* now quantify & encode AC coefs */
1557
        for(;;) {
1558
            UPDATE_CACHE(re, &s->gb);
1559
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1560
            
1561
            if(level == 127){
1562
                break;
1563
            } else if(level != 0) {
1564
                i += run;
1565
                j = scantable[i];
1566
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1567
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1568
                LAST_SKIP_BITS(re, &s->gb, 1);
1569
            } else {
1570
                /* escape */
1571
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1572
                UPDATE_CACHE(re, &s->gb);
1573
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1574
1575
                i += run;
1576
                j = scantable[i];
1577
                if(level<0){
1578
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1579
                    level= -level;
1580
                }else{
1581
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1582
                }
1583
            }
1584
            if (i > 63){
1585 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1586 3729c912 Michael Niedermayer
                return -1;
1587
            }
1588
            
1589
            mismatch ^= level;
1590
            block[j] = level;
1591 25ed7f92 Fabrice Bellard
        }
1592 3729c912 Michael Niedermayer
        CLOSE_READER(re, &s->gb);
1593 de6d9b64 Fabrice Bellard
    }
1594
    block[63] ^= (mismatch & 1);
1595 3729c912 Michael Niedermayer
    
1596 de6d9b64 Fabrice Bellard
    s->block_last_index[n] = i;
1597
    return 0;
1598
}
1599
1600 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1601
                               DCTELEM *block, 
1602
                               int n)
1603 de6d9b64 Fabrice Bellard
{
1604
    int level, dc, diff, i, j, run;
1605 3729c912 Michael Niedermayer
    int component;
1606 de6d9b64 Fabrice Bellard
    RLTable *rl;
1607 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1608
    const uint16_t *quant_matrix;
1609 3729c912 Michael Niedermayer
    const int qscale= s->qscale;
1610 de6d9b64 Fabrice Bellard
    int mismatch;
1611
1612
    /* DC coef */
1613 3729c912 Michael Niedermayer
    if (n < 4){
1614
        quant_matrix = s->intra_matrix;
1615
        component = 0; 
1616
    }else{
1617
        quant_matrix = s->chroma_intra_matrix;
1618
        component = n - 3;
1619
    }
1620 c3bf0288 Michael Niedermayer
    diff = decode_dc(&s->gb, component);
1621 de6d9b64 Fabrice Bellard
    if (diff >= 0xffff)
1622
        return -1;
1623
    dc = s->last_dc[component];
1624
    dc += diff;
1625
    s->last_dc[component] = dc;
1626
    block[0] = dc << (3 - s->intra_dc_precision);
1627
    dprintf("dc=%d\n", block[0]);
1628 d753173a Fabrice Bellard
    mismatch = block[0] ^ 1;
1629 3729c912 Michael Niedermayer
    i = 0;
1630 de6d9b64 Fabrice Bellard
    if (s->intra_vlc_format)
1631
        rl = &rl_mpeg2;
1632
    else
1633
        rl = &rl_mpeg1;
1634 25ed7f92 Fabrice Bellard
1635 3729c912 Michael Niedermayer
    {
1636
        OPEN_READER(re, &s->gb);    
1637
        /* now quantify & encode AC coefs */
1638
        for(;;) {
1639
            UPDATE_CACHE(re, &s->gb);
1640
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1641
            
1642
            if(level == 127){
1643
                break;
1644
            } else if(level != 0) {
1645
                i += run;
1646
                j = scantable[i];
1647
                level= (level*qscale*quant_matrix[j])>>4;
1648
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1649
                LAST_SKIP_BITS(re, &s->gb, 1);
1650
            } else {
1651
                /* escape */
1652
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1653
                UPDATE_CACHE(re, &s->gb);
1654
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1655
                i += run;
1656
                j = scantable[i];
1657
                if(level<0){
1658
                    level= (-level*qscale*quant_matrix[j])>>4;
1659
                    level= -level;
1660
                }else{
1661
                    level= (level*qscale*quant_matrix[j])>>4;
1662
                }
1663
            }
1664
            if (i > 63){
1665 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1666 3729c912 Michael Niedermayer
                return -1;
1667
            }
1668
            
1669
            mismatch^= level;
1670
            block[j] = level;
1671 9ac7ecd6 Michael Niedermayer
        }
1672 3729c912 Michael Niedermayer
        CLOSE_READER(re, &s->gb);
1673 de6d9b64 Fabrice Bellard
    }
1674 3729c912 Michael Niedermayer
    block[63]^= mismatch&1;
1675
    
1676 de6d9b64 Fabrice Bellard
    s->block_last_index[n] = i;
1677
    return 0;
1678
}
1679
1680
typedef struct Mpeg1Context {
1681
    MpegEncContext mpeg_enc_ctx;
1682
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1683 1cb0edb4 Juanjo
    int repeat_field; /* true if we must repeat the field */
1684 fa384dcc Michael Niedermayer
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1685 de6d9b64 Fabrice Bellard
} Mpeg1Context;
1686
1687
static int mpeg_decode_init(AVCodecContext *avctx)
1688
{
1689
    Mpeg1Context *s = avctx->priv_data;
1690 8f8402e4 Michael Niedermayer
    
1691 94aec31f Michael Niedermayer
    s->mpeg_enc_ctx.flags= avctx->flags;
1692 8f8402e4 Michael Niedermayer
    common_init(&s->mpeg_enc_ctx);
1693 c3bf0288 Michael Niedermayer
    init_vlcs();
1694 de6d9b64 Fabrice Bellard
1695
    s->mpeg_enc_ctx_allocated = 0;
1696
    s->mpeg_enc_ctx.picture_number = 0;
1697 1cb0edb4 Juanjo
    s->repeat_field = 0;
1698 d7e9533a Michael Niedermayer
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1699 de6d9b64 Fabrice Bellard
    return 0;
1700
}
1701
1702
/* return the 8 bit start code value and update the search
1703
   state. Return -1 if no start code found */
1704 80097bbf Michael Niedermayer
static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1705 de6d9b64 Fabrice Bellard
{
1706 0c1a9eda Zdenek Kabelac
    uint8_t *buf_ptr;
1707 80097bbf Michael Niedermayer
    unsigned int state=0xFFFFFFFF, v;
1708 de6d9b64 Fabrice Bellard
    int val;
1709
1710
    buf_ptr = *pbuf_ptr;
1711
    while (buf_ptr < buf_end) {
1712
        v = *buf_ptr++;
1713
        if (state == 0x000001) {
1714
            state = ((state << 8) | v) & 0xffffff;
1715
            val = state;
1716
            goto found;
1717
        }
1718
        state = ((state << 8) | v) & 0xffffff;
1719
    }
1720
    val = -1;
1721
 found:
1722
    *pbuf_ptr = buf_ptr;
1723
    return val;
1724
}
1725
1726
static int mpeg1_decode_picture(AVCodecContext *avctx, 
1727 0c1a9eda Zdenek Kabelac
                                uint8_t *buf, int buf_size)
1728 de6d9b64 Fabrice Bellard
{
1729
    Mpeg1Context *s1 = avctx->priv_data;
1730
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1731
    int ref, f_code;
1732
1733 68f593b4 Michael Niedermayer
    init_get_bits(&s->gb, buf, buf_size*8);
1734 de6d9b64 Fabrice Bellard
1735
    ref = get_bits(&s->gb, 10); /* temporal ref */
1736
    s->pict_type = get_bits(&s->gb, 3);
1737 b9ecd1ee Fabrice Bellard
    dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1738 58bfafbe Michael Niedermayer
1739 612476ef Arpi
    skip_bits(&s->gb, 16);
1740 de6d9b64 Fabrice Bellard
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1741 612476ef Arpi
        s->full_pel[0] = get_bits1(&s->gb);
1742 de6d9b64 Fabrice Bellard
        f_code = get_bits(&s->gb, 3);
1743
        if (f_code == 0)
1744
            return -1;
1745
        s->mpeg_f_code[0][0] = f_code;
1746
        s->mpeg_f_code[0][1] = f_code;
1747
    }
1748
    if (s->pict_type == B_TYPE) {
1749 612476ef Arpi
        s->full_pel[1] = get_bits1(&s->gb);
1750 de6d9b64 Fabrice Bellard
        f_code = get_bits(&s->gb, 3);
1751
        if (f_code == 0)
1752
            return -1;
1753
        s->mpeg_f_code[1][0] = f_code;
1754
        s->mpeg_f_code[1][1] = f_code;
1755
    }
1756 1e491e29 Michael Niedermayer
    s->current_picture.pict_type= s->pict_type;
1757
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1758 d9cb5429 Michael Niedermayer
    
1759 de6d9b64 Fabrice Bellard
    s->y_dc_scale = 8;
1760
    s->c_dc_scale = 8;
1761
    s->first_slice = 1;
1762
    return 0;
1763
}
1764
1765
static void mpeg_decode_sequence_extension(MpegEncContext *s)
1766
{
1767
    int horiz_size_ext, vert_size_ext;
1768 945f15b7 Michael Niedermayer
    int bit_rate_ext, vbv_buf_ext;
1769 de6d9b64 Fabrice Bellard
    int frame_rate_ext_n, frame_rate_ext_d;
1770 029911d1 Michael Niedermayer
    int level, profile;
1771 de6d9b64 Fabrice Bellard
1772 029911d1 Michael Niedermayer
    skip_bits(&s->gb, 1); /* profil and level esc*/
1773
    profile= get_bits(&s->gb, 3);
1774
    level= get_bits(&s->gb, 4);
1775 1cb0edb4 Juanjo
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1776 612476ef Arpi
    skip_bits(&s->gb, 2); /* chroma_format */
1777 de6d9b64 Fabrice Bellard
    horiz_size_ext = get_bits(&s->gb, 2);
1778
    vert_size_ext = get_bits(&s->gb, 2);
1779
    s->width |= (horiz_size_ext << 12);
1780
    s->height |= (vert_size_ext << 12);
1781
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1782
    s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1783 612476ef Arpi
    skip_bits1(&s->gb); /* marker */
1784 de6d9b64 Fabrice Bellard
    vbv_buf_ext = get_bits(&s->gb, 8);
1785 e0560448 Michael Niedermayer
1786 945f15b7 Michael Niedermayer
    s->low_delay = get_bits1(&s->gb);
1787 e0560448 Michael Niedermayer
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1788
1789 de6d9b64 Fabrice Bellard
    frame_rate_ext_n = get_bits(&s->gb, 2);
1790
    frame_rate_ext_d = get_bits(&s->gb, 5);
1791 14bea432 Michael Niedermayer
    av_reduce(
1792
        &s->avctx->frame_rate, 
1793
        &s->avctx->frame_rate_base, 
1794
        frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1795
        MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1796
        1<<30);
1797
1798 de6d9b64 Fabrice Bellard
    dprintf("sequence extension\n");
1799 029911d1 Michael Niedermayer
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1800 fb4a4a56 Fabrice Bellard
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1801 945f15b7 Michael Niedermayer
1802 5ff85f1d Michael Niedermayer
    if(s->aspect_ratio_info <= 1)
1803
        s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
1804
    else{
1805
        s->avctx->sample_aspect_ratio= 
1806
            av_div_q(
1807
                mpeg2_aspect[s->aspect_ratio_info], 
1808
                (AVRational){s->width, s->height}
1809
            );
1810
    }
1811 029911d1 Michael Niedermayer
    
1812
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1813 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d \n", profile, level);
1814 de6d9b64 Fabrice Bellard
}
1815
1816 fa384dcc Michael Niedermayer
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1817
{
1818
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1819
    int color_description, w, h;
1820
1821
    skip_bits(&s->gb, 3); /* video format */
1822
    color_description= get_bits1(&s->gb);
1823
    if(color_description){
1824
        skip_bits(&s->gb, 8); /* color primaries */
1825
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1826
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1827
    }
1828
    w= get_bits(&s->gb, 14);
1829
    skip_bits(&s->gb, 1); //marker
1830
    h= get_bits(&s->gb, 14);
1831
    skip_bits(&s->gb, 1); //marker
1832
    
1833
    s1->pan_scan.width= 16*w;
1834
    s1->pan_scan.height=16*h;
1835
1836 5ff85f1d Michael Niedermayer
    if(s->aspect_ratio_info > 1)
1837
        s->avctx->sample_aspect_ratio= 
1838
            av_div_q(
1839
                mpeg2_aspect[s->aspect_ratio_info], 
1840
                (AVRational){w, h}
1841
            );
1842 fa384dcc Michael Niedermayer
    
1843
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1844 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1845 fa384dcc Michael Niedermayer
}
1846
1847
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1848
{
1849
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1850
    int i;
1851
1852
    for(i=0; i<1; i++){ //FIXME count
1853
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1854
        skip_bits(&s->gb, 1); //marker
1855
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1856
        skip_bits(&s->gb, 1); //marker
1857
    }
1858
   
1859
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1860 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
1861 fa384dcc Michael Niedermayer
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
1862
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
1863
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1864
        );
1865
}
1866
1867 de6d9b64 Fabrice Bellard
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1868
{
1869 60832448 Fabrice Bellard
    int i, v, j;
1870 de6d9b64 Fabrice Bellard
1871 25ed7f92 Fabrice Bellard
    dprintf("matrix extension\n");
1872
1873 612476ef Arpi
    if (get_bits1(&s->gb)) {
1874 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1875
            v = get_bits(&s->gb, 8);
1876 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1877 60832448 Fabrice Bellard
            s->intra_matrix[j] = v;
1878
            s->chroma_intra_matrix[j] = v;
1879 de6d9b64 Fabrice Bellard
        }
1880
    }
1881 612476ef Arpi
    if (get_bits1(&s->gb)) {
1882 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1883
            v = get_bits(&s->gb, 8);
1884 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1885 d7e9533a Michael Niedermayer
            s->inter_matrix[j] = v;
1886
            s->chroma_inter_matrix[j] = v;
1887 de6d9b64 Fabrice Bellard
        }
1888
    }
1889 612476ef Arpi
    if (get_bits1(&s->gb)) {
1890 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1891
            v = get_bits(&s->gb, 8);
1892 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1893 60832448 Fabrice Bellard
            s->chroma_intra_matrix[j] = v;
1894 de6d9b64 Fabrice Bellard
        }
1895
    }
1896 612476ef Arpi
    if (get_bits1(&s->gb)) {
1897 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1898
            v = get_bits(&s->gb, 8);
1899 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1900 d7e9533a Michael Niedermayer
            s->chroma_inter_matrix[j] = v;
1901 de6d9b64 Fabrice Bellard
        }
1902
    }
1903
}
1904
1905
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1906
{
1907
    s->full_pel[0] = s->full_pel[1] = 0;
1908
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1909
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1910
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1911
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1912
    s->intra_dc_precision = get_bits(&s->gb, 2);
1913
    s->picture_structure = get_bits(&s->gb, 2);
1914 612476ef Arpi
    s->top_field_first = get_bits1(&s->gb);
1915
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1916
    s->concealment_motion_vectors = get_bits1(&s->gb);
1917
    s->q_scale_type = get_bits1(&s->gb);
1918
    s->intra_vlc_format = get_bits1(&s->gb);
1919
    s->alternate_scan = get_bits1(&s->gb);
1920
    s->repeat_first_field = get_bits1(&s->gb);
1921
    s->chroma_420_type = get_bits1(&s->gb);
1922
    s->progressive_frame = get_bits1(&s->gb);
1923 acf44abb Michael Niedermayer
    
1924 dfb476cb Michael Niedermayer
    if(s->picture_structure == PICT_FRAME)
1925
        s->first_field=0;
1926
    else{
1927
        s->first_field ^= 1;
1928 7bc9090a Michael Niedermayer
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1929 dfb476cb Michael Niedermayer
    }
1930
    
1931 acf44abb Michael Niedermayer
    if(s->alternate_scan){
1932 3d2e8cce Michael Niedermayer
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1933
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1934
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1935
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1936 acf44abb Michael Niedermayer
    }else{
1937 3d2e8cce Michael Niedermayer
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1938
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1939
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1940
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1941 acf44abb Michael Niedermayer
    }
1942
    
1943 de6d9b64 Fabrice Bellard
    /* composite display not parsed */
1944 1cb0edb4 Juanjo
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1945 25ed7f92 Fabrice Bellard
    dprintf("picture_structure=%d\n", s->picture_structure);
1946 e0a3d744 Juanjo
    dprintf("top field first=%d\n", s->top_field_first);
1947
    dprintf("repeat first field=%d\n", s->repeat_first_field);
1948 de6d9b64 Fabrice Bellard
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
1949 25ed7f92 Fabrice Bellard
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1950
    dprintf("alternate_scan=%d\n", s->alternate_scan);
1951 de6d9b64 Fabrice Bellard
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1952 1cb0edb4 Juanjo
    dprintf("progressive_frame=%d\n", s->progressive_frame);
1953 de6d9b64 Fabrice Bellard
}
1954
1955
static void mpeg_decode_extension(AVCodecContext *avctx, 
1956 0c1a9eda Zdenek Kabelac
                                  uint8_t *buf, int buf_size)
1957 de6d9b64 Fabrice Bellard
{
1958
    Mpeg1Context *s1 = avctx->priv_data;
1959
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1960
    int ext_type;
1961
1962 68f593b4 Michael Niedermayer
    init_get_bits(&s->gb, buf, buf_size*8);
1963 de6d9b64 Fabrice Bellard
    
1964
    ext_type = get_bits(&s->gb, 4);
1965
    switch(ext_type) {
1966
    case 0x1:
1967
        mpeg_decode_sequence_extension(s);
1968
        break;
1969 fa384dcc Michael Niedermayer
    case 0x2:
1970
        mpeg_decode_sequence_display_extension(s1);
1971
        break;
1972 de6d9b64 Fabrice Bellard
    case 0x3:
1973
        mpeg_decode_quant_matrix_extension(s);
1974
        break;
1975 fa384dcc Michael Niedermayer
    case 0x7:
1976
        mpeg_decode_picture_display_extension(s1);
1977
        break;
1978 de6d9b64 Fabrice Bellard
    case 0x8:
1979
        mpeg_decode_picture_coding_extension(s);
1980
        break;
1981
    }
1982
}
1983
1984 a579db0c Ivan Kalvachev
static void exchange_uv(MpegEncContext *s){
1985
short * tmp;
1986
1987
    tmp = s->pblocks[4];
1988
    s->pblocks[4] = s->pblocks[5];
1989
    s->pblocks[5] = tmp;
1990 ff862be5 Michael Niedermayer
}
1991
1992 86f85dca Michael Niedermayer
#define DECODE_SLICE_FATAL_ERROR -2
1993
#define DECODE_SLICE_ERROR -1
1994
#define DECODE_SLICE_OK 0
1995
1996
/**
1997
 * decodes a slice.
1998
 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1999
 *         DECODE_SLICE_ERROR if the slice is damaged<br>
2000
 *         DECODE_SLICE_OK if this slice is ok<br>
2001
 */
2002 de6d9b64 Fabrice Bellard
static int mpeg_decode_slice(AVCodecContext *avctx, 
2003 492cd3a9 Michael Niedermayer
                              AVFrame *pict,
2004 de6d9b64 Fabrice Bellard
                              int start_code,
2005 80097bbf Michael Niedermayer
                              uint8_t **buf, int buf_size)
2006 de6d9b64 Fabrice Bellard
{
2007
    Mpeg1Context *s1 = avctx->priv_data;
2008
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2009
    int ret;
2010 dfb476cb Michael Niedermayer
    const int field_pic= s->picture_structure != PICT_FRAME;
2011 de6d9b64 Fabrice Bellard
2012 db6e7795 Michael Niedermayer
    s->resync_mb_x= s->mb_x = 
2013
    s->resync_mb_y= s->mb_y = -1;
2014
    
2015 de6d9b64 Fabrice Bellard
    start_code = (start_code - 1) & 0xff;
2016 9ac7ecd6 Michael Niedermayer
    if (start_code >= s->mb_height){
2017 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", start_code, s->mb_height);
2018 db6e7795 Michael Niedermayer
        return -1;
2019 9ac7ecd6 Michael Niedermayer
    }
2020 9b8709d1 Michael Niedermayer
    
2021
    ff_mpeg1_clean_buffers(s);
2022 7bc9090a Michael Niedermayer
    s->interlaced_dct = 0;
2023 dfb476cb Michael Niedermayer
        
2024 de6d9b64 Fabrice Bellard
    /* start frame decoding */
2025 b536d0aa Michael Niedermayer
    if (s->first_slice) {
2026
      if(s->first_field || s->picture_structure==PICT_FRAME){
2027 d6db1c9c Michael Niedermayer
        if(MPV_frame_start(s, avctx) < 0)
2028 86f85dca Michael Niedermayer
            return DECODE_SLICE_FATAL_ERROR;
2029 7bc9090a Michael Niedermayer
2030
        ff_er_frame_start(s);
2031
2032 2ec23b6d Michael Niedermayer
        /* first check if we must repeat the frame */
2033 9ee2c20e Fabrice Bellard
        s->current_picture_ptr->repeat_pict = 0;
2034 2ec23b6d Michael Niedermayer
        if (s->repeat_first_field) {
2035
            if (s->progressive_sequence) {
2036
                if (s->top_field_first)
2037 9ee2c20e Fabrice Bellard
                    s->current_picture_ptr->repeat_pict = 4;
2038 2ec23b6d Michael Niedermayer
                else
2039 9ee2c20e Fabrice Bellard
                    s->current_picture_ptr->repeat_pict = 2;
2040 2ec23b6d Michael Niedermayer
            } else if (s->progressive_frame) {
2041 9ee2c20e Fabrice Bellard
                s->current_picture_ptr->repeat_pict = 1;
2042 2ec23b6d Michael Niedermayer
            }
2043
        }         
2044 fa384dcc Michael Niedermayer
2045
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2046
2047 9ee2c20e Fabrice Bellard
        //printf("%d\n", s->current_picture_ptr->repeat_pict);
2048 2ec23b6d Michael Niedermayer
2049 59b571c1 Michael Niedermayer
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2050 9b879566 Michel Bardiaux
             av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n", 
2051 59b571c1 Michael Niedermayer
                 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],
2052
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2053
                 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2054
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2055
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2056
        }
2057 b536d0aa Michael Niedermayer
      }else{ //second field
2058
            int i;
2059 37b787f1 Michael Niedermayer
            
2060
            if(!s->current_picture_ptr){
2061 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2062 37b787f1 Michael Niedermayer
                return -1;
2063
            }
2064
            
2065 b536d0aa Michael Niedermayer
            for(i=0; i<4; i++){
2066
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2067
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2068
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2069
                } 
2070
            }
2071
      }
2072 2e7b4c84 Ivan Kalvachev
#ifdef HAVE_XVMC
2073
// MPV_frame_start will call this function too,
2074
// but we need to call it on every field
2075
      if(s->avctx->xvmc_acceleration)
2076
         XVMC_field_start(s,avctx);
2077
#endif
2078
    }//fi(s->first_slice)
2079 dfb476cb Michael Niedermayer
    s->first_slice = 0;
2080 de6d9b64 Fabrice Bellard
2081 80097bbf Michael Niedermayer
    init_get_bits(&s->gb, *buf, buf_size*8);
2082 de6d9b64 Fabrice Bellard
2083 0ee50938 Fabrice Bellard
    s->qscale = get_qscale(s);
2084 7bc9090a Michael Niedermayer
    if(s->qscale == 0){
2085 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2086 db6e7795 Michael Niedermayer
        return -1;
2087 7bc9090a Michael Niedermayer
    }
2088
    
2089 de6d9b64 Fabrice Bellard
    /* extra slice info */
2090 612476ef Arpi
    while (get_bits1(&s->gb) != 0) {
2091
        skip_bits(&s->gb, 8);
2092 de6d9b64 Fabrice Bellard
    }
2093 7bc9090a Michael Niedermayer
    
2094 ce5b7c5e Michael Niedermayer
    s->mb_x=0;
2095 7bc9090a Michael Niedermayer
2096 ce5b7c5e Michael Niedermayer
    for(;;) {
2097
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2098 7bc9090a Michael Niedermayer
        if (code < 0){
2099 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2100 db6e7795 Michael Niedermayer
            return -1;
2101 7bc9090a Michael Niedermayer
        }
2102 ce5b7c5e Michael Niedermayer
        if (code >= 33) {
2103
            if (code == 33) {
2104
                s->mb_x += 33;
2105
            }
2106
            /* otherwise, stuffing, nothing to do */
2107
        } else {
2108
            s->mb_x += code;
2109
            break;
2110
        }
2111
    }
2112 9b8709d1 Michael Niedermayer
    
2113 7bc9090a Michael Niedermayer
    s->resync_mb_x= s->mb_x;
2114
    s->resync_mb_y= s->mb_y = start_code;
2115 9b8709d1 Michael Niedermayer
    s->mb_skip_run= 0;
2116 7d1c3fc1 Michael Niedermayer
    ff_init_block_index(s);
2117 ce5b7c5e Michael Niedermayer
2118 de6d9b64 Fabrice Bellard
    for(;;) {
2119 a579db0c Ivan Kalvachev
#ifdef HAVE_XVMC
2120
        //one 1 we memcpy blocks in xvmcvideo
2121
        if(s->avctx->xvmc_acceleration > 1)
2122
            XVMC_init_block(s);//set s->block
2123
#endif
2124
2125 eb4b3dd3 Zdenek Kabelac
        s->dsp.clear_blocks(s->block[0]);
2126 7bc9090a Michael Niedermayer
2127 b7ec19d3 Fabrice Bellard
        ret = mpeg_decode_mb(s, s->block);
2128 7bc9090a Michael Niedermayer
2129 de6d9b64 Fabrice Bellard
        dprintf("ret=%d\n", ret);
2130
        if (ret < 0)
2131
            return -1;
2132 7bc9090a Michael Niedermayer
            
2133
        if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
2134
            const int wrap = s->block_wrap[0];
2135
            const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2136
            int motion_x, motion_y;
2137
2138 db6e7795 Michael Niedermayer
            if (s->mb_intra) {
2139
                motion_x = motion_y = 0;
2140
            }else if (s->mv_type == MV_TYPE_16X16) {
2141 7bc9090a Michael Niedermayer
                motion_x = s->mv[0][0][0];
2142
                motion_y = s->mv[0][0][1];
2143
            } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
2144
                motion_x = s->mv[0][0][0] + s->mv[0][1][0];
2145
                motion_y = s->mv[0][0][1] + s->mv[0][1][1];
2146
                motion_x = (motion_x>>1) | (motion_x&1);
2147
            }
2148
            s->motion_val[xy][0] = motion_x;
2149
            s->motion_val[xy][1] = motion_y;
2150
            s->motion_val[xy + 1][0] = motion_x;
2151
            s->motion_val[xy + 1][1] = motion_y;
2152
            s->motion_val[xy + wrap][0] = motion_x;
2153
            s->motion_val[xy + wrap][1] = motion_y;
2154
            s->motion_val[xy + 1 + wrap][0] = motion_x;
2155
            s->motion_val[xy + 1 + wrap][1] = motion_y;
2156
        }
2157 b536d0aa Michael Niedermayer
        
2158 7d1c3fc1 Michael Niedermayer
        s->dest[0] += 16;
2159
        s->dest[1] += 8;
2160
        s->dest[2] += 8;
2161 ce5b7c5e Michael Niedermayer
2162 7d1c3fc1 Michael Niedermayer
        MPV_decode_mb(s, s->block);
2163
        
2164 ce5b7c5e Michael Niedermayer
        if (++s->mb_x >= s->mb_width) {
2165 ff862be5 Michael Niedermayer
2166 3bb07d61 Michael Niedermayer
            ff_draw_horiz_band(s, 16*s->mb_y, 16);
2167 ce5b7c5e Michael Niedermayer
2168
            s->mb_x = 0;
2169
            s->mb_y++;
2170 cf713bb8 Michael Niedermayer
2171
            if(s->mb_y<<field_pic >= s->mb_height){
2172
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2173
2174
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2175
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2176 9b879566 Michel Bardiaux
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2177 cf713bb8 Michael Niedermayer
                    return -1;
2178
                }else
2179
                    goto eos;
2180
            }
2181 7d1c3fc1 Michael Niedermayer
            
2182
            ff_init_block_index(s);
2183 ce5b7c5e Michael Niedermayer
        }
2184
2185
        /* skip mb handling */
2186 9b8709d1 Michael Niedermayer
        if (s->mb_skip_run == -1) {
2187 ce5b7c5e Michael Niedermayer
            /* read again increment */
2188 9b8709d1 Michael Niedermayer
            s->mb_skip_run = 0;
2189 ce5b7c5e Michael Niedermayer
            for(;;) {
2190
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2191 7bc9090a Michael Niedermayer
                if (code < 0){
2192 9b879566 Michel Bardiaux
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2193 9c00c3af Michael Niedermayer
                    return -1;
2194 7bc9090a Michael Niedermayer
                }
2195 ce5b7c5e Michael Niedermayer
                if (code >= 33) {
2196
                    if (code == 33) {
2197 9b8709d1 Michael Niedermayer
                        s->mb_skip_run += 33;
2198 9c00c3af Michael Niedermayer
                    }else if(code == 35){
2199
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2200 9b879566 Michel Bardiaux
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2201 9c00c3af Michael Niedermayer
                            return -1;
2202
                        }
2203
                        goto eos; /* end of slice */
2204 ce5b7c5e Michael Niedermayer
                    }
2205
                    /* otherwise, stuffing, nothing to do */
2206
                } else {
2207 9b8709d1 Michael Niedermayer
                    s->mb_skip_run += code;
2208 ce5b7c5e Michael Niedermayer
                    break;
2209
                }
2210
            }
2211
        }
2212 de6d9b64 Fabrice Bellard
    }
2213 db6e7795 Michael Niedermayer
eos: // end of slice
2214
    *buf += get_bits_count(&s->gb)/8 - 1;
2215 7bc9090a Michael Niedermayer
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2216 db6e7795 Michael Niedermayer
    return 0;
2217
}
2218 7bc9090a Michael Niedermayer
2219 db6e7795 Michael Niedermayer
/**
2220
 * handles slice ends.
2221
 * @return 1 if it seems to be the last slice of 
2222
 */
2223
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2224
{
2225
    Mpeg1Context *s1 = avctx->priv_data;
2226
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2227
       
2228 36b58e85 Roman Shaposhnik
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2229 855127bc Fabrice Bellard
        return 0;
2230
2231 2e7b4c84 Ivan Kalvachev
#ifdef HAVE_XVMC
2232
    if(s->avctx->xvmc_acceleration)
2233
        XVMC_field_end(s);
2234
#endif
2235 de6d9b64 Fabrice Bellard
    /* end of slice reached */
2236 db6e7795 Michael Niedermayer
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2237 de6d9b64 Fabrice Bellard
        /* end of image */
2238 1e491e29 Michael Niedermayer
2239 029911d1 Michael Niedermayer
        if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2240 0426af31 Michael Niedermayer
            s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2241
        }else
2242
            s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2243
2244 7bc9090a Michael Niedermayer
        ff_er_frame_end(s);
2245 de6d9b64 Fabrice Bellard
2246
        MPV_frame_end(s);
2247
2248 4e00e76b Michael Niedermayer
        if (s->pict_type == B_TYPE || s->low_delay) {
2249 8e937a4a Michael Niedermayer
            *pict= *(AVFrame*)s->current_picture_ptr;
2250 7bc9090a Michael Niedermayer
            ff_print_debug_info(s, s->current_picture_ptr);
2251 de6d9b64 Fabrice Bellard
        } else {
2252 1e491e29 Michael Niedermayer
            s->picture_number++;
2253 de6d9b64 Fabrice Bellard
            /* latency of 1 frame for I and P frames */
2254
            /* XXX: use another variable than picture_number */
2255 80097bbf Michael Niedermayer
            if (s->last_picture_ptr != NULL) {
2256 8e937a4a Michael Niedermayer
                *pict= *(AVFrame*)s->last_picture_ptr;
2257 7bc9090a Michael Niedermayer
                 ff_print_debug_info(s, s->last_picture_ptr);
2258 de6d9b64 Fabrice Bellard
            }
2259
        }
2260 ff862be5 Michael Niedermayer
2261 db6e7795 Michael Niedermayer
        return 1;
2262 de6d9b64 Fabrice Bellard
    } else {
2263 db6e7795 Michael Niedermayer
        return 0;
2264 de6d9b64 Fabrice Bellard
    }
2265
}
2266
2267
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2268 0c1a9eda Zdenek Kabelac
                                 uint8_t *buf, int buf_size)
2269 de6d9b64 Fabrice Bellard
{
2270
    Mpeg1Context *s1 = avctx->priv_data;
2271
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2272 60832448 Fabrice Bellard
    int width, height, i, v, j;
2273 945f15b7 Michael Niedermayer
    float aspect;
2274 fb4a4a56 Fabrice Bellard
2275 68f593b4 Michael Niedermayer
    init_get_bits(&s->gb, buf, buf_size*8);
2276 de6d9b64 Fabrice Bellard
2277
    width = get_bits(&s->gb, 12);
2278
    height = get_bits(&s->gb, 12);
2279 945f15b7 Michael Niedermayer
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2280 029911d1 Michael Niedermayer
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
2281 f259747b Michael Niedermayer
        aspect= 1.0/mpeg1_aspect[s->aspect_ratio_info];
2282 5c9e4723 Michael Niedermayer
        if(aspect!=0.0) avctx->sample_aspect_ratio= av_d2q(aspect, 255);
2283 945f15b7 Michael Niedermayer
    }
2284
2285 de6d9b64 Fabrice Bellard
    s->frame_rate_index = get_bits(&s->gb, 4);
2286
    if (s->frame_rate_index == 0)
2287
        return -1;
2288
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2289 612476ef Arpi
    if (get_bits1(&s->gb) == 0) /* marker */
2290 de6d9b64 Fabrice Bellard
        return -1;
2291
    if (width <= 0 || height <= 0 ||
2292
        (width % 2) != 0 || (height % 2) != 0)
2293
        return -1;
2294
    if (width != s->width ||
2295
        height != s->height) {
2296
        /* start new mpeg1 context decoding */
2297
        s->out_format = FMT_MPEG1;
2298
        if (s1->mpeg_enc_ctx_allocated) {
2299
            MPV_common_end(s);
2300
        }
2301
        s->width = width;
2302
        s->height = height;
2303 4e00e76b Michael Niedermayer
        avctx->has_b_frames= 1;
2304 0c23ead1 Fabrice Bellard
        s->avctx = avctx;
2305 de6d9b64 Fabrice Bellard
        avctx->width = width;
2306
        avctx->height = height;
2307 14bea432 Michael Niedermayer
        av_reduce(
2308
            &avctx->frame_rate, 
2309
            &avctx->frame_rate_base,
2310
            frame_rate_tab[s->frame_rate_index],
2311
            MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form 
2312
            1<<30
2313
            );
2314 de6d9b64 Fabrice Bellard
        avctx->bit_rate = s->bit_rate;
2315
        
2316 2e7b4c84 Ivan Kalvachev
        //get_format() or set_video(width,height,aspect,pix_fmt);
2317
        //until then pix_fmt may be changed right after codec init
2318
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2319 a579db0c Ivan Kalvachev
            if( avctx->idct_algo == FF_IDCT_AUTO )
2320
                avctx->idct_algo = FF_IDCT_SIMPLE;
2321 2e7b4c84 Ivan Kalvachev
2322 de6d9b64 Fabrice Bellard
        if (MPV_common_init(s) < 0)
2323
            return -1;
2324
        s1->mpeg_enc_ctx_allocated = 1;
2325 a579db0c Ivan Kalvachev
        s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2326 de6d9b64 Fabrice Bellard
    }
2327
2328 612476ef Arpi
    skip_bits(&s->gb, 10); /* vbv_buffer_size */
2329
    skip_bits(&s->gb, 1);
2330 de6d9b64 Fabrice Bellard
2331
    /* get matrix */
2332 612476ef Arpi
    if (get_bits1(&s->gb)) {
2333 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
2334
            v = get_bits(&s->gb, 8);
2335 2ad1516a Michael Niedermayer
            j = s->intra_scantable.permutated[i];
2336 60832448 Fabrice Bellard
            s->intra_matrix[j] = v;
2337
            s->chroma_intra_matrix[j] = v;
2338 de6d9b64 Fabrice Bellard
        }
2339 25ed7f92 Fabrice Bellard
#ifdef DEBUG
2340
        dprintf("intra matrix present\n");
2341
        for(i=0;i<64;i++)
2342 8e1652dc Michael Niedermayer
            dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2343 25ed7f92 Fabrice Bellard
        printf("\n");
2344
#endif
2345 de6d9b64 Fabrice Bellard
    } else {
2346
        for(i=0;i<64;i++) {
2347 b0368839 Michael Niedermayer
            int j= s->dsp.idct_permutation[i];
2348 adc09b2e Marko Kreen
            v = ff_mpeg1_default_intra_matrix[i];
2349 2ad1516a Michael Niedermayer
            s->intra_matrix[j] = v;
2350
            s->chroma_intra_matrix[j] = v;
2351 de6d9b64 Fabrice Bellard
        }
2352
    }
2353 612476ef Arpi
    if (get_bits1(&s->gb)) {
2354 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
2355
            v = get_bits(&s->gb, 8);
2356 2ad1516a Michael Niedermayer
            j = s->intra_scantable.permutated[i];
2357 d7e9533a Michael Niedermayer
            s->inter_matrix[j] = v;
2358
            s->chroma_inter_matrix[j] = v;
2359 de6d9b64 Fabrice Bellard
        }
2360 25ed7f92 Fabrice Bellard
#ifdef DEBUG
2361
        dprintf("non intra matrix present\n");
2362
        for(i=0;i<64;i++)
2363 8e1652dc Michael Niedermayer
            dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2364 25ed7f92 Fabrice Bellard
        printf("\n");
2365
#endif
2366 de6d9b64 Fabrice Bellard
    } else {
2367
        for(i=0;i<64;i++) {
2368 b0368839 Michael Niedermayer
            int j= s->dsp.idct_permutation[i];
2369 adc09b2e Marko Kreen
            v = ff_mpeg1_default_non_intra_matrix[i];
2370 2ad1516a Michael Niedermayer
            s->inter_matrix[j] = v;
2371
            s->chroma_inter_matrix[j] = v;
2372 de6d9b64 Fabrice Bellard
        }
2373
    }
2374
2375
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2376
    s->progressive_sequence = 1;
2377
    s->progressive_frame = 1;
2378
    s->picture_structure = PICT_FRAME;
2379
    s->frame_pred_frame_dct = 1;
2380 029911d1 Michael Niedermayer
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2381 fb4a4a56 Fabrice Bellard
    avctx->sub_id = 1; /* indicates mpeg1 */
2382 de6d9b64 Fabrice Bellard
    return 0;
2383
}
2384
2385 e94bc100 Michael Niedermayer
static int vcr2_init_sequence(AVCodecContext *avctx)
2386
{
2387
    Mpeg1Context *s1 = avctx->priv_data;
2388
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2389 008f0851 Michael Niedermayer
    int i, v;
2390 e94bc100 Michael Niedermayer
2391
    /* start new mpeg1 context decoding */
2392
    s->out_format = FMT_MPEG1;
2393
    if (s1->mpeg_enc_ctx_allocated) {
2394
        MPV_common_end(s);
2395
    }
2396
    s->width = avctx->width;
2397
    s->height = avctx->height;
2398
    avctx->has_b_frames= 0; //true?
2399 ff862be5 Michael Niedermayer
    s->low_delay= 1;
2400 e94bc100 Michael Niedermayer
    s->avctx = avctx;
2401 2e7b4c84 Ivan Kalvachev
2402
    //get_format() or set_video(width,height,aspect,pix_fmt);
2403
    //until then pix_fmt may be changed right after codec init
2404
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2405 a579db0c Ivan Kalvachev
        if( avctx->idct_algo == FF_IDCT_AUTO )
2406
            avctx->idct_algo = FF_IDCT_SIMPLE;
2407 e94bc100 Michael Niedermayer
    
2408
    if (MPV_common_init(s) < 0)
2409
        return -1;
2410 a579db0c Ivan Kalvachev
    exchange_uv(s);//common init reset pblocks, so we swap them here
2411
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2412 e94bc100 Michael Niedermayer
    s1->mpeg_enc_ctx_allocated = 1;
2413
2414
    for(i=0;i<64;i++) {
2415
        int j= s->dsp.idct_permutation[i];
2416
        v = ff_mpeg1_default_intra_matrix[i];
2417
        s->intra_matrix[j] = v;
2418
        s->chroma_intra_matrix[j] = v;
2419
2420
        v = ff_mpeg1_default_non_intra_matrix[i];
2421
        s->inter_matrix[j] = v;
2422
        s->chroma_inter_matrix[j] = v;
2423
    }
2424
2425
    s->progressive_sequence = 1;
2426
    s->progressive_frame = 1;
2427
    s->picture_structure = PICT_FRAME;
2428
    s->frame_pred_frame_dct = 1;
2429 029911d1 Michael Niedermayer
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2430 008f0851 Michael Niedermayer
    avctx->sub_id = 2; /* indicates mpeg2 */
2431 e94bc100 Michael Niedermayer
    return 0;
2432
}
2433
2434
2435 e2f9490e Fabrice Bellard
static void mpeg_decode_user_data(AVCodecContext *avctx, 
2436
                                  const uint8_t *buf, int buf_size)
2437
{
2438
    const uint8_t *p;
2439
    int len, flags;
2440
    p = buf;
2441
    len = buf_size;
2442
2443
    /* we parse the DTG active format information */
2444
    if (len >= 5 &&
2445
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2446
        flags = p[4];
2447
        p += 5;
2448
        len -= 5;
2449
        if (flags & 0x80) {
2450
            /* skip event id */
2451
            if (len < 2)
2452
                return;
2453
            p += 2;
2454
            len -= 2;
2455
        }
2456
        if (flags & 0x40) {
2457
            if (len < 1)
2458
                return;
2459
            avctx->dtg_active_format = p[0] & 0x0f;
2460
        }
2461
    }
2462
}
2463
2464 80097bbf Michael Niedermayer
/**
2465
 * finds the end of the current frame in the bitstream.
2466
 * @return the position of the first byte of the next frame, or -1
2467
 */
2468
static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2469
    ParseContext *pc= &s->parse_context;
2470
    int i;
2471
    uint32_t state;
2472
    
2473
    state= pc->state;
2474
    
2475
    i=0;
2476
    if(!pc->frame_start_found){
2477
        for(i=0; i<buf_size; i++){
2478
            state= (state<<8) | buf[i];
2479
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2480
                i++;
2481
                pc->frame_start_found=1;
2482
                break;
2483
            }
2484
        }
2485
    }
2486
    
2487
    if(pc->frame_start_found){
2488
        for(; i<buf_size; i++){
2489
            state= (state<<8) | buf[i];
2490
            if((state&0xFFFFFF00) == 0x100){
2491
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2492
                    pc->frame_start_found=0;
2493
                    pc->state=-1; 
2494
                    return i-3;
2495
                }
2496
            }
2497
        }
2498
    }        
2499
    pc->state= state;
2500 bb463d81 Michael Niedermayer
    return END_NOT_FOUND;
2501 80097bbf Michael Niedermayer
}
2502
2503 de6d9b64 Fabrice Bellard
/* handle buffering and image synchronisation */
2504
static int mpeg_decode_frame(AVCodecContext *avctx, 
2505
                             void *data, int *data_size,
2506 0c1a9eda Zdenek Kabelac
                             uint8_t *buf, int buf_size)
2507 de6d9b64 Fabrice Bellard
{
2508
    Mpeg1Context *s = avctx->priv_data;
2509 80097bbf Michael Niedermayer
    uint8_t *buf_end, *buf_ptr;
2510
    int ret, start_code, input_size;
2511 492cd3a9 Michael Niedermayer
    AVFrame *picture = data;
2512 1cb0edb4 Juanjo
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2513 de6d9b64 Fabrice Bellard
    dprintf("fill_buffer\n");
2514
2515
    *data_size = 0;
2516 d7e9533a Michael Niedermayer
2517 de6d9b64 Fabrice Bellard
    /* special case for last picture */
2518 e9174ba4 Michael Niedermayer
    if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2519
        *picture= *(AVFrame*)s2->next_picture_ptr;
2520
        s2->next_picture_ptr= NULL;
2521 1e491e29 Michael Niedermayer
2522 e9174ba4 Michael Niedermayer
        *data_size = sizeof(AVFrame);
2523 de6d9b64 Fabrice Bellard
        return 0;
2524
    }
2525
2526 80097bbf Michael Niedermayer
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2527 bb463d81 Michael Niedermayer
        int next= mpeg1_find_frame_end(s2, buf, buf_size);
2528 80097bbf Michael Niedermayer
        
2529
        if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2530
            return buf_size;
2531
    }    
2532
    
2533 de6d9b64 Fabrice Bellard
    buf_ptr = buf;
2534
    buf_end = buf + buf_size;
2535 e0a3d744 Juanjo
2536
#if 0    
2537
    if (s->repeat_field % 2 == 1) { 
2538 1cb0edb4 Juanjo
        s->repeat_field++;
2539
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2540 e0a3d744 Juanjo
        //        s2->picture_number, s->repeat_field);
2541
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2542
            *data_size = sizeof(AVPicture);
2543
            goto the_end;
2544
        }
2545 1cb0edb4 Juanjo
    }
2546 e0a3d744 Juanjo
#endif
2547 e94bc100 Michael Niedermayer
2548
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2549
        vcr2_init_sequence(avctx);
2550
2551 80097bbf Michael Niedermayer
    for(;;) {
2552 de6d9b64 Fabrice Bellard
        /* find start next code */
2553 80097bbf Michael Niedermayer
        start_code = find_start_code(&buf_ptr, buf_end);
2554 cfcff636 Michael Niedermayer
        if (start_code < 0){
2555 80de6a80 Michael Niedermayer
            if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2556
                if (slice_end(avctx, picture)) {
2557
                    if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2558
                        *data_size = sizeof(AVPicture);
2559
                }
2560 db6e7795 Michael Niedermayer
            }
2561 cfcff636 Michael Niedermayer
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2562 de6d9b64 Fabrice Bellard
        }
2563 cf713bb8 Michael Niedermayer
        
2564
        input_size = buf_end - buf_ptr;
2565
2566
        if(avctx->debug & FF_DEBUG_STARTCODE){
2567 9b879566 Michel Bardiaux
            av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2568 cf713bb8 Michael Niedermayer
        }
2569 80097bbf Michael Niedermayer
2570 de6d9b64 Fabrice Bellard
                /* prepare data for next start code */
2571
                switch(start_code) {
2572
                case SEQ_START_CODE:
2573 80097bbf Michael Niedermayer
                    mpeg1_decode_sequence(avctx, buf_ptr, 
2574 de6d9b64 Fabrice Bellard
                                          input_size);
2575
                    break;
2576
                            
2577
                case PICTURE_START_CODE:
2578
                    /* we have a complete image : we try to decompress it */
2579
                    mpeg1_decode_picture(avctx, 
2580 80097bbf Michael Niedermayer
                                         buf_ptr, input_size);
2581 de6d9b64 Fabrice Bellard
                    break;
2582
                case EXT_START_CODE:
2583
                    mpeg_decode_extension(avctx,
2584 80097bbf Michael Niedermayer
                                          buf_ptr, input_size);
2585 e2f9490e Fabrice Bellard
                    break;
2586
                case USER_START_CODE:
2587
                    mpeg_decode_user_data(avctx, 
2588 80097bbf Michael Niedermayer
                                          buf_ptr, input_size);
2589 de6d9b64 Fabrice Bellard
                    break;
2590 05fd1577 Michael Niedermayer
                case GOP_START_CODE:
2591
                    s2->first_field=0;
2592
                    break;
2593 de6d9b64 Fabrice Bellard
                default:
2594
                    if (start_code >= SLICE_MIN_START_CODE &&
2595 d9cb5429 Michael Niedermayer
                        start_code <= SLICE_MAX_START_CODE) {
2596 945f15b7 Michael Niedermayer
                        
2597
                        /* skip b frames if we dont have reference frames */
2598 b536d0aa Michael Niedermayer
                        if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2599 945f15b7 Michael Niedermayer
                        /* skip b frames if we are in a hurry */
2600
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2601
                        /* skip everything if we are in a hurry>=5 */
2602
                        if(avctx->hurry_up>=5) break;
2603 80097bbf Michael Niedermayer
                        
2604 37b787f1 Michael Niedermayer
                        if (!s->mpeg_enc_ctx_allocated) break;
2605
2606 de6d9b64 Fabrice Bellard
                        ret = mpeg_decode_slice(avctx, picture,
2607 80097bbf Michael Niedermayer
                                                start_code, &buf_ptr, input_size);
2608 db6e7795 Michael Niedermayer
                        emms_c();
2609 dfb476cb Michael Niedermayer
2610 db6e7795 Michael Niedermayer
                        if(ret < 0){
2611
                            if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2612 7bc9090a Michael Niedermayer
                                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);
2613 db6e7795 Michael Niedermayer
                            if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2614
                        }else{
2615
                            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);
2616 de6d9b64 Fabrice Bellard
                        }
2617
                    }
2618
                    break;
2619
                }
2620
    }
2621
}
2622
2623
static int mpeg_decode_end(AVCodecContext *avctx)
2624
{
2625
    Mpeg1Context *s = avctx->priv_data;
2626
2627
    if (s->mpeg_enc_ctx_allocated)
2628
        MPV_common_end(&s->mpeg_enc_ctx);
2629
    return 0;
2630
}
2631
2632 922bc38d Michael Niedermayer
AVCodec mpeg1video_decoder = {
2633
    "mpeg1video",
2634 de6d9b64 Fabrice Bellard
    CODEC_TYPE_VIDEO,
2635
    CODEC_ID_MPEG1VIDEO,
2636
    sizeof(Mpeg1Context),
2637
    mpeg_decode_init,
2638
    NULL,
2639
    mpeg_decode_end,
2640
    mpeg_decode_frame,
2641 d7425f59 Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2642 922bc38d Michael Niedermayer
    .flush= ff_mpeg_flush,
2643
};
2644
2645
AVCodec mpeg2video_decoder = {
2646
    "mpeg2video",
2647
    CODEC_TYPE_VIDEO,
2648
    CODEC_ID_MPEG2VIDEO,
2649
    sizeof(Mpeg1Context),
2650
    mpeg_decode_init,
2651
    NULL,
2652
    mpeg_decode_end,
2653
    mpeg_decode_frame,
2654
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2655 7a06ff14 Michael Niedermayer
    .flush= ff_mpeg_flush,
2656 de6d9b64 Fabrice Bellard
};
2657 2e7b4c84 Ivan Kalvachev
2658
#ifdef HAVE_XVMC
2659
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2660
    Mpeg1Context *s;
2661
2662
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2663
        return -1;
2664 a579db0c Ivan Kalvachev
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2665 2e7b4c84 Ivan Kalvachev
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2666 a579db0c Ivan Kalvachev
    }
2667 2e7b4c84 Ivan Kalvachev
    mpeg_decode_init(avctx);
2668
    s = avctx->priv_data;
2669
2670
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2671 a579db0c Ivan Kalvachev
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2672 2e7b4c84 Ivan Kalvachev
2673
    return 0;
2674
}
2675
2676
AVCodec mpeg_xvmc_decoder = {
2677
    "mpegvideo_xvmc",
2678
    CODEC_TYPE_VIDEO,
2679
    CODEC_ID_MPEG2VIDEO_XVMC,
2680
    sizeof(Mpeg1Context),
2681
    mpeg_mc_decode_init,
2682
    NULL,
2683
    mpeg_decode_end,
2684
    mpeg_decode_frame,
2685
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2686
};
2687
2688
#endif
2689 c3bf0288 Michael Niedermayer
2690
/* this is ugly i know, but the alternative is too make 
2691
   hundreds of vars global and prefix them with ff_mpeg1_
2692
   which is far uglier. */
2693
#include "mdec.c"