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ffmpeg / libavcodec / h263dec.c @ e40f5d3c

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1 de6d9b64 Fabrice Bellard
/*
2 983e3246 Michael Niedermayer
 * H.263 decoder
3 ff4ec49e Fabrice Bellard
 * Copyright (c) 2001 Fabrice Bellard.
4 8f2ab833 Michael Niedermayer
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 de6d9b64 Fabrice Bellard
 *
6 ff4ec49e Fabrice Bellard
 * This library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10 de6d9b64 Fabrice Bellard
 *
11 ff4ec49e Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
12 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ff4ec49e Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15 de6d9b64 Fabrice Bellard
 *
16 ff4ec49e Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with this library; if not, write to the Free Software
18
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 de6d9b64 Fabrice Bellard
 */
20 983e3246 Michael Niedermayer
 
21
/**
22
 * @file h263dec.c
23
 * H.263 decoder.
24
 */
25
 
26 de6d9b64 Fabrice Bellard
#include "avcodec.h"
27 6000abfa Fabrice Bellard
#include "dsputil.h"
28 de6d9b64 Fabrice Bellard
#include "mpegvideo.h"
29
30
//#define DEBUG
31 02734c6a Michael Niedermayer
//#define PRINT_FRAME_TIME
32 de6d9b64 Fabrice Bellard
33 1457ab52 Michael Niedermayer
int ff_h263_decode_init(AVCodecContext *avctx)
34 de6d9b64 Fabrice Bellard
{
35
    MpegEncContext *s = avctx->priv_data;
36 519c2b6d Fabrice Bellard
37 bf89e6b1 Fabrice Bellard
    s->avctx = avctx;
38 de6d9b64 Fabrice Bellard
    s->out_format = FMT_H263;
39
40
    s->width = avctx->width;
41
    s->height = avctx->height;
42 92ba5ffb Michael Niedermayer
    s->workaround_bugs= avctx->workaround_bugs;
43 de6d9b64 Fabrice Bellard
44 4d2858de Michael Niedermayer
    // set defaults
45
    s->quant_precision=5;
46
    s->progressive_sequence=1;
47
    s->decode_mb= ff_h263_decode_mb;
48 4e00e76b Michael Niedermayer
    s->low_delay= 1;
49 5fe061a0 Michael Niedermayer
    avctx->pix_fmt= PIX_FMT_YUV420P;
50 a573cc27 Michael Niedermayer
    s->unrestricted_mv= 1;
51 4d2858de Michael Niedermayer
52 de6d9b64 Fabrice Bellard
    /* select sub codec */
53
    switch(avctx->codec->id) {
54
    case CODEC_ID_H263:
55 68b94c35 Michael Niedermayer
        s->unrestricted_mv= 0;
56 de6d9b64 Fabrice Bellard
        break;
57 bf89e6b1 Fabrice Bellard
    case CODEC_ID_MPEG4:
58 fcfee63b Michael Niedermayer
        s->decode_mb= ff_mpeg4_decode_mb;
59 de6d9b64 Fabrice Bellard
        s->time_increment_bits = 4; /* default value for broken headers */
60
        s->h263_pred = 1;
61 4e00e76b Michael Niedermayer
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
62 de6d9b64 Fabrice Bellard
        break;
63 84afee34 Michael Niedermayer
    case CODEC_ID_MSMPEG4V1:
64 de6d9b64 Fabrice Bellard
        s->h263_msmpeg4 = 1;
65
        s->h263_pred = 1;
66 84afee34 Michael Niedermayer
        s->msmpeg4_version=1;
67
        break;
68
    case CODEC_ID_MSMPEG4V2:
69
        s->h263_msmpeg4 = 1;
70
        s->h263_pred = 1;
71
        s->msmpeg4_version=2;
72
        break;
73
    case CODEC_ID_MSMPEG4V3:
74
        s->h263_msmpeg4 = 1;
75
        s->h263_pred = 1;
76
        s->msmpeg4_version=3;
77 de6d9b64 Fabrice Bellard
        break;
78 e1a9dbff Michael Niedermayer
    case CODEC_ID_WMV1:
79
        s->h263_msmpeg4 = 1;
80
        s->h263_pred = 1;
81
        s->msmpeg4_version=4;
82
        break;
83 8f8402e4 Michael Niedermayer
    case CODEC_ID_WMV2:
84
        s->h263_msmpeg4 = 1;
85
        s->h263_pred = 1;
86
        s->msmpeg4_version=5;
87
        break;
88 de6d9b64 Fabrice Bellard
    case CODEC_ID_H263I:
89
        break;
90 d4f5d74a Garrick Meeker
    case CODEC_ID_FLV1:
91
        s->h263_flv = 1;
92
        break;
93 de6d9b64 Fabrice Bellard
    default:
94
        return -1;
95
    }
96 d7e9533a Michael Niedermayer
    s->codec_id= avctx->codec->id;
97 93a21abd Michael Niedermayer
98 de6d9b64 Fabrice Bellard
    /* for h263, we allocate the images after having read the header */
99 488fa19a Michael Niedermayer
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
100 4949028f Juanjo
        if (MPV_common_init(s) < 0)
101
            return -1;
102 de6d9b64 Fabrice Bellard
103
    if (s->h263_msmpeg4)
104 8f8402e4 Michael Niedermayer
        ff_msmpeg4_decode_init(s);
105 de6d9b64 Fabrice Bellard
    else
106
        h263_decode_init_vlc(s);
107
    
108
    return 0;
109
}
110
111 1457ab52 Michael Niedermayer
int ff_h263_decode_end(AVCodecContext *avctx)
112 de6d9b64 Fabrice Bellard
{
113
    MpegEncContext *s = avctx->priv_data;
114
115
    MPV_common_end(s);
116
    return 0;
117
}
118
119 7866eeff Michael Niedermayer
/**
120
 * retunrs the number of bytes consumed for building the current frame
121
 */
122
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
123
    int pos= (get_bits_count(&s->gb)+7)>>3;
124 d7425f59 Michael Niedermayer
    
125 d5a21172 Michael Niedermayer
    if(s->divx_packed){
126 7866eeff Michael Niedermayer
        //we would have to scan through the whole buf to handle the weird reordering ...
127
        return buf_size; 
128 d7425f59 Michael Niedermayer
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
129
        pos -= s->parse_context.last_index;
130
        if(pos<0) pos=0; // padding is not really read so this might be -1
131
        return pos;
132 7866eeff Michael Niedermayer
    }else{
133
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
134 77277835 Michael Niedermayer
        if(pos+10>buf_size) pos=buf_size; // oops ;)
135 7866eeff Michael Niedermayer
136
        return pos;
137
    }
138
}
139
140 4d2858de Michael Niedermayer
static int decode_slice(MpegEncContext *s){
141 46b4feec Michael Niedermayer
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
142 4d2858de Michael Niedermayer
    s->last_resync_gb= s->gb;
143
    s->first_slice_line= 1;
144
        
145
    s->resync_mb_x= s->mb_x;
146
    s->resync_mb_y= s->mb_y;
147
148 554daa24 Michael Niedermayer
    ff_set_qscale(s, s->qscale);
149 4d2858de Michael Niedermayer
    
150
    if(s->partitioned_frame){
151
        const int qscale= s->qscale;
152
153
        if(s->codec_id==CODEC_ID_MPEG4){
154
            if(ff_mpeg4_decode_partitions(s) < 0)
155
                return -1; 
156
        }
157
        
158 d99ce8d7 Fabrice Bellard
        /* restore variables which were modified */
159 4d2858de Michael Niedermayer
        s->first_slice_line=1;
160
        s->mb_x= s->resync_mb_x;
161
        s->mb_y= s->resync_mb_y;
162 554daa24 Michael Niedermayer
        ff_set_qscale(s, qscale);
163 4d2858de Michael Niedermayer
    }
164
165
    for(; s->mb_y < s->mb_height; s->mb_y++) {
166
        /* per-row end of slice checks */
167
        if(s->msmpeg4_version){
168
            if(s->resync_mb_y + s->slice_height == s->mb_y){
169 46b4feec Michael Niedermayer
                ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
170
171 4d2858de Michael Niedermayer
                return 0;
172
            }
173
        }
174
        
175
        if(s->msmpeg4_version==1){
176
            s->last_dc[0]=
177
            s->last_dc[1]=
178
            s->last_dc[2]= 128;
179
        }
180
    
181
        ff_init_block_index(s);
182
        for(; s->mb_x < s->mb_width; s->mb_x++) {
183
            int ret;
184
185
            ff_update_block_index(s);
186
187
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
188
                s->first_slice_line=0; 
189
            }
190
191
            /* DCT & quantize */
192 eb4b3dd3 Zdenek Kabelac
            s->dsp.clear_blocks(s->block[0]);
193 4d2858de Michael Niedermayer
            
194
            s->mv_dir = MV_DIR_FORWARD;
195
            s->mv_type = MV_TYPE_16X16;
196 1e491e29 Michael Niedermayer
//            s->mb_skiped = 0;
197 4d2858de Michael Niedermayer
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
198
            ret= s->decode_mb(s, s->block);
199
200 7d1c3fc1 Michael Niedermayer
            if (s->pict_type!=B_TYPE)
201
                ff_h263_update_motion_val(s);
202
203 4d2858de Michael Niedermayer
            if(ret<0){
204 7bc9090a Michael Niedermayer
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
205 4d2858de Michael Niedermayer
                if(ret==SLICE_END){
206 aef95c8c Michael Niedermayer
                    MPV_decode_mb(s, s->block);
207 332f9ac4 Michael Niedermayer
                    if(s->loop_filter)
208
                        ff_h263_loop_filter(s);
209 aef95c8c Michael Niedermayer
210 35aa136a Michael Niedermayer
//printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
211 46b4feec Michael Niedermayer
                    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
212 a61f8265 Michael Niedermayer
213
                    s->padding_bug_score--;
214
                        
215 4d2858de Michael Niedermayer
                    if(++s->mb_x >= s->mb_width){
216
                        s->mb_x=0;
217 640950c7 Michael Niedermayer
                        ff_draw_horiz_band(s, s->mb_y*16, 16);
218 4d2858de Michael Niedermayer
                        s->mb_y++;
219
                    }
220
                    return 0; 
221
                }else if(ret==SLICE_NOEND){
222 9b879566 Michel Bardiaux
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
223 46b4feec Michael Niedermayer
                    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
224 4d2858de Michael Niedermayer
                    return -1;
225
                }
226 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
227 46b4feec Michael Niedermayer
                ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
228 4d2858de Michael Niedermayer
    
229
                return -1;
230
            }
231 aef95c8c Michael Niedermayer
232
            MPV_decode_mb(s, s->block);
233 332f9ac4 Michael Niedermayer
            if(s->loop_filter)
234
                ff_h263_loop_filter(s);
235 4d2858de Michael Niedermayer
        }
236
        
237 640950c7 Michael Niedermayer
        ff_draw_horiz_band(s, s->mb_y*16, 16);
238 4d2858de Michael Niedermayer
        
239
        s->mb_x= 0;
240
    }
241
    
242
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
243
244 a61f8265 Michael Niedermayer
    /* try to detect the padding bug */
245
    if(      s->codec_id==CODEC_ID_MPEG4
246
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT) 
247 68f593b4 Michael Niedermayer
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
248
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
249 96d9cb22 Michael Niedermayer
//       &&   !s->resync_marker
250 a61f8265 Michael Niedermayer
       &&   !s->data_partitioning){
251
        
252
        const int bits_count= get_bits_count(&s->gb);
253 68f593b4 Michael Niedermayer
        const int bits_left = s->gb.size_in_bits - bits_count;
254 a61f8265 Michael Niedermayer
        
255 650faac6 Michael Niedermayer
        if(bits_left==0){
256
            s->padding_bug_score+=16;
257
        }else if(bits_left>8){
258 a61f8265 Michael Niedermayer
            s->padding_bug_score++;
259 8671359b Michael Niedermayer
        } else if(bits_left != 1){
260 a61f8265 Michael Niedermayer
            int v= show_bits(&s->gb, 8);
261
            v|= 0x7F >> (7-(bits_count&7));
262 8671359b Michael Niedermayer
263 a61f8265 Michael Niedermayer
            if(v==0x7F)
264
                s->padding_bug_score--;
265
            else
266
                s->padding_bug_score++;            
267 650faac6 Michael Niedermayer
        }                          
268 a61f8265 Michael Niedermayer
    }
269
270 4d2858de Michael Niedermayer
    // handle formats which dont have unique end markers
271 cb7c98d6 Michael Niedermayer
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
272 68f593b4 Michael Niedermayer
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
273 4d2858de Michael Niedermayer
        int max_extra=7;
274
        
275
        /* no markers in M$ crap */
276
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
277
            max_extra+= 17;
278
        
279
        /* buggy padding but the frame should still end approximately at the bitstream end */
280 cb7c98d6 Michael Niedermayer
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
281 4d2858de Michael Niedermayer
            max_extra+= 48;
282 cb7c98d6 Michael Niedermayer
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
283 4d2858de Michael Niedermayer
            max_extra+= 256*256*256*64;
284
        
285
        if(left>max_extra){
286 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
287 4d2858de Michael Niedermayer
        }
288
        else if(left<0){
289 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
290 4d2858de Michael Niedermayer
        }else
291 46b4feec Michael Niedermayer
            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
292 4d2858de Michael Niedermayer
        
293
        return 0;
294
    }
295 a61f8265 Michael Niedermayer
296 9b879566 Michel Bardiaux
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", 
297 68f593b4 Michael Niedermayer
            s->gb.size_in_bits - get_bits_count(&s->gb),
298 9b6a5b87 Michael Niedermayer
            show_bits(&s->gb, 24), s->padding_bug_score);
299 46b4feec Michael Niedermayer
            
300
    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
301
302 4d2858de Michael Niedermayer
    return -1;
303
}
304
305 d7425f59 Michael Niedermayer
/**
306
 * finds the end of the current frame in the bitstream.
307
 * @return the position of the first byte of the next frame, or -1
308
 */
309 0c1a9eda Zdenek Kabelac
static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
310 d7425f59 Michael Niedermayer
    ParseContext *pc= &s->parse_context;
311
    int vop_found, i;
312
    uint32_t state;
313
    
314
    vop_found= pc->frame_start_found;
315
    state= pc->state;
316
    
317
    i=0;
318
    if(!vop_found){
319
        for(i=0; i<buf_size; i++){
320
            state= (state<<8) | buf[i];
321
            if(state == 0x1B6){
322
                i++;
323
                vop_found=1;
324
                break;
325
            }
326
        }
327
    }
328 80097bbf Michael Niedermayer
329
    if(vop_found){    
330
      for(; i<buf_size; i++){
331 d7425f59 Michael Niedermayer
        state= (state<<8) | buf[i];
332
        if((state&0xFFFFFF00) == 0x100){
333
            pc->frame_start_found=0;
334
            pc->state=-1; 
335
            return i-3;
336
        }
337 80097bbf Michael Niedermayer
      }
338 d7425f59 Michael Niedermayer
    }
339
    pc->frame_start_found= vop_found;
340
    pc->state= state;
341 067ff8b1 Michael Niedermayer
    return END_NOT_FOUND;
342 d7425f59 Michael Niedermayer
}
343
344 d07f9043 Michael Niedermayer
static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
345
    ParseContext *pc= &s->parse_context;
346
    int vop_found, i;
347
    uint32_t state;
348
    
349
    vop_found= pc->frame_start_found;
350
    state= pc->state;
351
    
352
    i=0;
353
    if(!vop_found){
354
        for(i=0; i<buf_size; i++){
355
            state= (state<<8) | buf[i];
356
            if(state>>(32-22) == 0x20){
357
                i++;
358
                vop_found=1;
359
                break;
360
            }
361
        }
362
    }
363
364
    if(vop_found){    
365
      for(; i<buf_size; i++){
366
        state= (state<<8) | buf[i];
367
        if(state>>(32-22) == 0x20){
368
            pc->frame_start_found=0;
369
            pc->state=-1; 
370
            return i-3;
371
        }
372
      }
373
    }
374
    pc->frame_start_found= vop_found;
375
    pc->state= state;
376
    
377
    return END_NOT_FOUND;
378
}
379
380 1457ab52 Michael Niedermayer
int ff_h263_decode_frame(AVCodecContext *avctx, 
381 de6d9b64 Fabrice Bellard
                             void *data, int *data_size,
382 0c1a9eda Zdenek Kabelac
                             uint8_t *buf, int buf_size)
383 de6d9b64 Fabrice Bellard
{
384
    MpegEncContext *s = avctx->priv_data;
385 1df1df0b Fabrice Bellard
    int ret;
386 492cd3a9 Michael Niedermayer
    AVFrame *pict = data; 
387 5d3cea3a Michael Niedermayer
    
388 02734c6a Michael Niedermayer
#ifdef PRINT_FRAME_TIME
389
uint64_t time= rdtsc();
390
#endif
391 de6d9b64 Fabrice Bellard
#ifdef DEBUG
392
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
393
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
394
#endif
395 b50eef3a Michael Niedermayer
    s->flags= avctx->flags;
396 303e50e6 Michael Niedermayer
    s->flags2= avctx->flags2;
397 6733417a Michael Niedermayer
398 dae9ffc4 Michael Niedermayer
    *data_size = 0;
399 e9174ba4 Michael Niedermayer
400
    /* no supplementary picture */
401 de6d9b64 Fabrice Bellard
    if (buf_size == 0) {
402 e9174ba4 Michael Niedermayer
        /* special case for last picture */
403
        if (s->low_delay==0 && s->next_picture_ptr) {
404
            *pict= *(AVFrame*)s->next_picture_ptr;
405
            s->next_picture_ptr= NULL;
406
407
            *data_size = sizeof(AVFrame);
408
        }
409
410 de6d9b64 Fabrice Bellard
        return 0;
411
    }
412 b7a22d84 Michael Niedermayer
413 d7425f59 Michael Niedermayer
    if(s->flags&CODEC_FLAG_TRUNCATED){
414
        int next;
415
        
416
        if(s->codec_id==CODEC_ID_MPEG4){
417
            next= mpeg4_find_frame_end(s, buf, buf_size);
418 d07f9043 Michael Niedermayer
        }else if(s->codec_id==CODEC_ID_H263){
419
            next= h263_find_frame_end(s, buf, buf_size);
420 d7425f59 Michael Niedermayer
        }else{
421 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
422 d7425f59 Michael Niedermayer
            return -1;
423
        }
424 b7a22d84 Michael Niedermayer
        
425
        if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
426 d7425f59 Michael Niedermayer
            return buf_size;
427
    }
428 de6d9b64 Fabrice Bellard
429 fb204d4b Michael Niedermayer
    
430 4a3d7fbc Michael Niedermayer
retry:
431
    
432 fb204d4b Michael Niedermayer
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
433 68f593b4 Michael Niedermayer
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
434 51b8fd19 Michael Niedermayer
    }else
435 68f593b4 Michael Niedermayer
        init_get_bits(&s->gb, buf, buf_size*8);
436 4136dd24 Michael Niedermayer
    s->bitstream_buffer_size=0;
437 de6d9b64 Fabrice Bellard
438 3a3d3a42 Michael Niedermayer
    if (!s->context_initialized) {
439 46fd0de8 Michael Niedermayer
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
440 3a3d3a42 Michael Niedermayer
            return -1;
441
    }
442 5f194811 Michael Niedermayer
    
443
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
444
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
445
        int i= ff_find_unused_picture(s, 0);
446
        s->current_picture_ptr= &s->picture[i];
447
    }
448 1457ab52 Michael Niedermayer
      
449 de6d9b64 Fabrice Bellard
    /* let's go :-) */
450 1457ab52 Michael Niedermayer
    if (s->msmpeg4_version==5) {
451
        ret= ff_wmv2_decode_picture_header(s);
452
    } else if (s->msmpeg4_version) {
453 de6d9b64 Fabrice Bellard
        ret = msmpeg4_decode_picture_header(s);
454
    } else if (s->h263_pred) {
455 b704e742 Michael Niedermayer
        if(s->avctx->extradata_size && s->picture_number==0){
456
            GetBitContext gb;
457
            
458 68f593b4 Michael Niedermayer
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
459 b704e742 Michael Niedermayer
            ret = ff_mpeg4_decode_picture_header(s, &gb);
460
        }
461
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
462
463 9f9c3229 Michael Niedermayer
        if(s->flags& CODEC_FLAG_LOW_DELAY)
464
            s->low_delay=1;
465 d55f7b65 Michael Niedermayer
    } else if (s->codec_id == CODEC_ID_H263I) {
466 de6d9b64 Fabrice Bellard
        ret = intel_h263_decode_picture_header(s);
467 d4f5d74a Garrick Meeker
    } else if (s->h263_flv) {
468
        ret = flv_h263_decode_picture_header(s);
469 de6d9b64 Fabrice Bellard
    } else {
470
        ret = h263_decode_picture_header(s);
471 488fa19a Michael Niedermayer
    }
472 ffba1dc0 Michael Niedermayer
    
473
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
474
475
    /* skip if the header was thrashed */
476
    if (ret < 0){
477 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
478 ffba1dc0 Michael Niedermayer
        return -1;
479
    }
480
    
481 4e00e76b Michael Niedermayer
    avctx->has_b_frames= !s->low_delay;
482 9b6a5b87 Michael Niedermayer
    
483
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
484 541ae140 Michael Niedermayer
        if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") || 
485
           s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
486 9b6a5b87 Michael Niedermayer
            s->xvid_build= -1;
487 541ae140 Michael Niedermayer
#if 0
488 8fc6c2b5 Michael Niedermayer
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
489
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 
490
            s->xvid_build= -1;
491 541ae140 Michael Niedermayer
#endif
492
    }
493 9b6a5b87 Michael Niedermayer
494 541ae140 Michael Niedermayer
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
495 9b6a5b87 Michael Niedermayer
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
496
            s->divx_version= 400; //divx 4
497
    }
498 4d2858de Michael Niedermayer
499
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
500 9b6a5b87 Michael Niedermayer
        s->workaround_bugs &= ~FF_BUG_NO_PADDING;
501
        
502
        if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
503 cb7c98d6 Michael Niedermayer
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
504
505 7004ffb3 Michael Niedermayer
        if(s->avctx->codec_tag == ff_get_fourcc("XVIX")) 
506 4d2858de Michael Niedermayer
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
507 9b6a5b87 Michael Niedermayer
508 7004ffb3 Michael Niedermayer
        if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
509 4d2858de Michael Niedermayer
            s->workaround_bugs|= FF_BUG_UMP4;
510
        }
511 03e93d35 Michael Niedermayer
512 9b6a5b87 Michael Niedermayer
        if(s->divx_version>=500){
513 03e93d35 Michael Niedermayer
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
514
        }
515 7da71a5c Michael Niedermayer
516 36df8805 Michael Niedermayer
        if(s->divx_version>502){
517
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
518
        }
519
520 a6a494fb Michael Niedermayer
        if(s->xvid_build && s->xvid_build<=3)
521
            s->padding_bug_score= 256*256*256*64;
522
        
523 7da71a5c Michael Niedermayer
        if(s->xvid_build && s->xvid_build<=1)
524
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
525
526 9b6a5b87 Michael Niedermayer
        if(s->xvid_build && s->xvid_build<=12)
527
            s->workaround_bugs|= FF_BUG_EDGE;
528
529 db794953 Michael Niedermayer
#define SET_QPEL_FUNC(postfix1, postfix2) \
530
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
531
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
532
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
533
534
        if(s->lavc_build && s->lavc_build<4653)
535
            s->workaround_bugs|= FF_BUG_STD_QPEL;
536
        
537 c40c3482 Michael Niedermayer
        if(s->lavc_build && s->lavc_build<4655)
538
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
539
540 8025405f Michael Niedermayer
        if(s->lavc_build && s->lavc_build<4670){
541 6674a126 Michael Niedermayer
            s->workaround_bugs|= FF_BUG_EDGE;
542
        }
543
544 c40c3482 Michael Niedermayer
        if(s->divx_version)
545
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
546 a61f8265 Michael Niedermayer
//printf("padding_bug_score: %d\n", s->padding_bug_score);
547 d671e2fe Michael Niedermayer
        if(s->divx_version==501 && s->divx_build==20020416)
548
            s->padding_bug_score= 256*256*256*64;
549 1c6dcb0f Michael Niedermayer
550 6674a126 Michael Niedermayer
        if(s->divx_version && s->divx_version<500){
551 1c6dcb0f Michael Niedermayer
            s->workaround_bugs|= FF_BUG_EDGE;
552
        }
553 7d1c3fc1 Michael Niedermayer
        
554 a61f8265 Michael Niedermayer
#if 0
555 4d2858de Michael Niedermayer
        if(s->divx_version==500)
556 d671e2fe Michael Niedermayer
            s->padding_bug_score= 256*256*256*64;
557 4d2858de Michael Niedermayer

558
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
559
         * lets hope this at least works
560
         */
561
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
562
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
563
            s->workaround_bugs|= FF_BUG_NO_PADDING;
564
        
565
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
566
            s->workaround_bugs|= FF_BUG_NO_PADDING;
567 a61f8265 Michael Niedermayer
#endif
568 4d2858de Michael Niedermayer
    }
569
    
570 db794953 Michael Niedermayer
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
571
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
572
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
573
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
574
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
575
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
576
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
577
578
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
579
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
580
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
581
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
582
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
583
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
584
    }
585 4d2858de Michael Niedermayer
586 8fc6c2b5 Michael Niedermayer
    if(avctx->debug & FF_DEBUG_BUGS)
587 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 
588 8fc6c2b5 Michael Niedermayer
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
589
               s->divx_packed ? "p" : "");
590
    
591 38274ea2 Michael Niedermayer
#if 0 // dump bits per frame / qp / complexity
592
{
593
    static FILE *f=NULL;
594
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
595 32b90921 Michael Niedermayer
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
596 38274ea2 Michael Niedermayer
}
597
#endif
598 93a21abd Michael Niedermayer
       
599 488fa19a Michael Niedermayer
        /* After H263 & mpeg4 header decode we have the height, width,*/
600 9eaa4690 Juanjo
        /* and other parameters. So then we could init the picture   */
601
        /* FIXME: By the way H263 decoder is evolving it should have */
602
        /* an H263EncContext                                         */
603 58b0b0dd Michael Niedermayer
    
604 5ff85f1d Michael Niedermayer
    if (   s->width != avctx->width || s->height != avctx->height) {
605 93a21abd Michael Niedermayer
        /* H.263 could change picture size any time */
606 bcc7125e Michael Niedermayer
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
607
        s->parse_context.buffer=0;
608 93a21abd Michael Niedermayer
        MPV_common_end(s);
609 bcc7125e Michael Niedermayer
        s->parse_context= pc;
610 93a21abd Michael Niedermayer
    }
611 488fa19a Michael Niedermayer
    if (!s->context_initialized) {
612 525e51e8 Michael Niedermayer
        avctx->width = s->width;
613
        avctx->height = s->height;
614 4d2858de Michael Niedermayer
615 4a3d7fbc Michael Niedermayer
        goto retry;
616 de6d9b64 Fabrice Bellard
    }
617 35aa136a Michael Niedermayer
618
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
619
        s->gob_index = ff_h263_get_gob_height(s);
620 347ae22e Michael Niedermayer
    
621 1e491e29 Michael Niedermayer
    // for hurry_up==5
622
    s->current_picture.pict_type= s->pict_type;
623
    s->current_picture.key_frame= s->pict_type == I_TYPE;
624 347ae22e Michael Niedermayer
625 1c2a8c7f Michael Niedermayer
    /* skip b frames if we dont have reference frames */
626 b536d0aa Michael Niedermayer
    if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
627 2417652e Michael Niedermayer
    /* skip b frames if we are in a hurry */
628 f8fd15e0 Michael Niedermayer
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
629 347ae22e Michael Niedermayer
    /* skip everything if we are in a hurry>=5 */
630 f8fd15e0 Michael Niedermayer
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
631 6733417a Michael Niedermayer
    
632
    if(s->next_p_frame_damaged){
633
        if(s->pict_type==B_TYPE)
634 7866eeff Michael Niedermayer
            return get_consumed_bytes(s, buf_size);
635 6733417a Michael Niedermayer
        else
636
            s->next_p_frame_damaged=0;
637
    }
638
639 d6db1c9c Michael Niedermayer
    if(MPV_frame_start(s, avctx) < 0)
640
        return -1;
641 de6d9b64 Fabrice Bellard
642
#ifdef DEBUG
643
    printf("qscale=%d\n", s->qscale);
644
#endif
645
646 46b4feec Michael Niedermayer
    ff_er_frame_start(s);
647 4d2858de Michael Niedermayer
    
648 487bce53 Michael Niedermayer
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
649
    //which isnt available before MPV_frame_start()
650
    if (s->msmpeg4_version==5){
651
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
652
            return -1;
653
    }
654
655 de6d9b64 Fabrice Bellard
    /* decode each macroblock */
656 4d2858de Michael Niedermayer
    s->mb_x=0; 
657
    s->mb_y=0;
658
    
659
    decode_slice(s);
660 487bce53 Michael Niedermayer
    while(s->mb_y<s->mb_height){
661 4d2858de Michael Niedermayer
        if(s->msmpeg4_version){
662 487bce53 Michael Niedermayer
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
663 4d2858de Michael Niedermayer
                break;
664
        }else{
665
            if(ff_h263_resync(s)<0)
666
                break;
667 6733417a Michael Niedermayer
        }
668
        
669 28269849 Michael Niedermayer
        if(s->msmpeg4_version<4 && s->h263_pred)
670 4d2858de Michael Niedermayer
            ff_mpeg4_clean_buffers(s);
671 649c00c9 Michael Niedermayer
672 4d2858de Michael Niedermayer
        decode_slice(s);
673 de6d9b64 Fabrice Bellard
    }
674 8b32880c Michael Niedermayer
675 e1a9dbff Michael Niedermayer
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
676 1e491e29 Michael Niedermayer
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
677
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
678
        }
679 eec1c6b9 Michael Niedermayer
    
680
    /* divx 5.01+ bistream reorder stuff */
681 d5a21172 Michael Niedermayer
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
682 6733417a Michael Niedermayer
        int current_pos= get_bits_count(&s->gb)>>3;
683 fb204d4b Michael Niedermayer
        int startcode_found=0;
684 6733417a Michael Niedermayer
685 eec1c6b9 Michael Niedermayer
        if(   buf_size - current_pos > 5 
686
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
687 6733417a Michael Niedermayer
            int i;
688 7866eeff Michael Niedermayer
            for(i=current_pos; i<buf_size-3; i++){
689 6733417a Michael Niedermayer
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
690
                    startcode_found=1;
691
                    break;
692
                }
693
            }
694 fb204d4b Michael Niedermayer
        }
695
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
696
            startcode_found=1;
697
            current_pos=0;
698
        }
699
700
        if(startcode_found){
701
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
702
            s->bitstream_buffer_size= buf_size - current_pos;
703 6733417a Michael Niedermayer
        }
704
    }
705
706 46b4feec Michael Niedermayer
    ff_er_frame_end(s);
707 4d2858de Michael Niedermayer
708 de6d9b64 Fabrice Bellard
    MPV_frame_end(s);
709 db794953 Michael Niedermayer
710 db6e7795 Michael Niedermayer
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
711
assert(s->current_picture.pict_type == s->pict_type);
712 4e00e76b Michael Niedermayer
    if(s->pict_type==B_TYPE || s->low_delay){
713 492cd3a9 Michael Niedermayer
        *pict= *(AVFrame*)&s->current_picture;
714 0c9bbaec Wolfgang Hesseler
        ff_print_debug_info(s, pict);
715 6f91bcd1 Michael Niedermayer
    } else {
716 492cd3a9 Michael Niedermayer
        *pict= *(AVFrame*)&s->last_picture;
717 0c9bbaec Wolfgang Hesseler
        ff_print_debug_info(s, pict);
718 6f91bcd1 Michael Niedermayer
    }
719 8fc69895 Michael Niedermayer
720 81401c1f Juanjo
    /* Return the Picture timestamp as the frame number */
721
    /* we substract 1 because it is added on utils.c    */
722
    avctx->frame_number = s->picture_number - 1;
723
724 4e00e76b Michael Niedermayer
    /* dont output the last pic after seeking */
725 b536d0aa Michael Niedermayer
    if(s->last_picture_ptr || s->low_delay)
726 492cd3a9 Michael Niedermayer
        *data_size = sizeof(AVFrame);
727 02734c6a Michael Niedermayer
#ifdef PRINT_FRAME_TIME
728
printf("%Ld\n", rdtsc()-time);
729
#endif
730 d07f9043 Michael Niedermayer
731 7866eeff Michael Niedermayer
    return get_consumed_bytes(s, buf_size);
732 de6d9b64 Fabrice Bellard
}
733
734 a77146ab Zdenek Kabelac
static const AVOption mpeg4_decoptions[] =
735
{
736
    AVOPTION_SUB(avoptions_workaround_bug),
737
    AVOPTION_END()
738
};
739
740 bf89e6b1 Fabrice Bellard
AVCodec mpeg4_decoder = {
741
    "mpeg4",
742 de6d9b64 Fabrice Bellard
    CODEC_TYPE_VIDEO,
743 bf89e6b1 Fabrice Bellard
    CODEC_ID_MPEG4,
744 de6d9b64 Fabrice Bellard
    sizeof(MpegEncContext),
745 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
746 de6d9b64 Fabrice Bellard
    NULL,
747 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
748
    ff_h263_decode_frame,
749 d7425f59 Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
750 a77146ab Zdenek Kabelac
    .options = mpeg4_decoptions,
751 7a06ff14 Michael Niedermayer
    .flush= ff_mpeg_flush,
752 de6d9b64 Fabrice Bellard
};
753
754
AVCodec h263_decoder = {
755
    "h263",
756
    CODEC_TYPE_VIDEO,
757
    CODEC_ID_H263,
758
    sizeof(MpegEncContext),
759 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
760 de6d9b64 Fabrice Bellard
    NULL,
761 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
762
    ff_h263_decode_frame,
763 d07f9043 Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
764 7a06ff14 Michael Niedermayer
    .flush= ff_mpeg_flush,
765 de6d9b64 Fabrice Bellard
};
766
767 84afee34 Michael Niedermayer
AVCodec msmpeg4v1_decoder = {
768
    "msmpeg4v1",
769
    CODEC_TYPE_VIDEO,
770
    CODEC_ID_MSMPEG4V1,
771
    sizeof(MpegEncContext),
772 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
773 84afee34 Michael Niedermayer
    NULL,
774 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
775
    ff_h263_decode_frame,
776 93a21abd Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
777 a77146ab Zdenek Kabelac
    mpeg4_decoptions,
778 84afee34 Michael Niedermayer
};
779
780
AVCodec msmpeg4v2_decoder = {
781
    "msmpeg4v2",
782
    CODEC_TYPE_VIDEO,
783
    CODEC_ID_MSMPEG4V2,
784
    sizeof(MpegEncContext),
785 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
786 84afee34 Michael Niedermayer
    NULL,
787 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
788
    ff_h263_decode_frame,
789 93a21abd Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
790 a77146ab Zdenek Kabelac
    mpeg4_decoptions,
791 84afee34 Michael Niedermayer
};
792
793
AVCodec msmpeg4v3_decoder = {
794 de6d9b64 Fabrice Bellard
    "msmpeg4",
795
    CODEC_TYPE_VIDEO,
796 84afee34 Michael Niedermayer
    CODEC_ID_MSMPEG4V3,
797 de6d9b64 Fabrice Bellard
    sizeof(MpegEncContext),
798 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
799 de6d9b64 Fabrice Bellard
    NULL,
800 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
801
    ff_h263_decode_frame,
802 93a21abd Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
803 a77146ab Zdenek Kabelac
    .options = mpeg4_decoptions,
804 de6d9b64 Fabrice Bellard
};
805
806 e1a9dbff Michael Niedermayer
AVCodec wmv1_decoder = {
807
    "wmv1",
808
    CODEC_TYPE_VIDEO,
809
    CODEC_ID_WMV1,
810
    sizeof(MpegEncContext),
811 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
812 8f8402e4 Michael Niedermayer
    NULL,
813 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
814
    ff_h263_decode_frame,
815 93a21abd Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
816 a77146ab Zdenek Kabelac
    mpeg4_decoptions,
817 8f8402e4 Michael Niedermayer
};
818
819 de6d9b64 Fabrice Bellard
AVCodec h263i_decoder = {
820
    "h263i",
821
    CODEC_TYPE_VIDEO,
822
    CODEC_ID_H263I,
823
    sizeof(MpegEncContext),
824 1457ab52 Michael Niedermayer
    ff_h263_decode_init,
825 de6d9b64 Fabrice Bellard
    NULL,
826 1457ab52 Michael Niedermayer
    ff_h263_decode_end,
827
    ff_h263_decode_frame,
828 93a21abd Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
829 a77146ab Zdenek Kabelac
    mpeg4_decoptions,
830 de6d9b64 Fabrice Bellard
};
831
832 d4f5d74a Garrick Meeker
AVCodec flv_decoder = {
833
    "flv",
834
    CODEC_TYPE_VIDEO,
835
    CODEC_ID_FLV1,
836
    sizeof(MpegEncContext),
837
    ff_h263_decode_init,
838
    NULL,
839
    ff_h263_decode_end,
840
    ff_h263_decode_frame,
841
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
842
};