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ffmpeg / libavformat / avidec.c @ 9862f9e1

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1
/*
2
 * AVI demuxer
3
 * Copyright (c) 2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
//#define DEBUG
23
//#define DEBUG_SEEK
24

    
25
#include "libavutil/intreadwrite.h"
26
#include "libavutil/bswap.h"
27
#include "avformat.h"
28
#include "avi.h"
29
#include "dv.h"
30
#include "riff.h"
31

    
32
#undef NDEBUG
33
#include <assert.h>
34

    
35
typedef struct AVIStream {
36
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
37
                         (used to compute the pts) */
38
    int remaining;
39
    int packet_size;
40

    
41
    int scale;
42
    int rate;
43
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
44

    
45
    int64_t cum_len; /* temporary storage (used during seek) */
46

    
47
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
48
    int prefix_count;
49
    uint32_t pal[256];
50
    int has_pal;
51
    int dshow_block_align;            ///< block align variable used to emulate bugs in the MS dshow demuxer
52
} AVIStream;
53

    
54
typedef struct {
55
    int64_t  riff_end;
56
    int64_t  movi_end;
57
    int64_t  fsize;
58
    int64_t movi_list;
59
    int64_t last_pkt_pos;
60
    int index_loaded;
61
    int is_odml;
62
    int non_interleaved;
63
    int stream_index;
64
    DVDemuxContext* dv_demux;
65
    int odml_depth;
66
#define MAX_ODML_DEPTH 1000
67
} AVIContext;
68

    
69
static const char avi_headers[][8] = {
70
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
71
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
72
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
73
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
74
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
75
    { 0 }
76
};
77

    
78
static int avi_load_index(AVFormatContext *s);
79
static int guess_ni_flag(AVFormatContext *s);
80

    
81
#ifdef DEBUG
82
static void print_tag(const char *str, unsigned int tag, int size)
83
{
84
    dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
85
           str, tag & 0xff,
86
           (tag >> 8) & 0xff,
87
           (tag >> 16) & 0xff,
88
           (tag >> 24) & 0xff,
89
           size);
90
}
91
#endif
92

    
93
static inline int get_duration(AVIStream *ast, int len){
94
    if(ast->sample_size){
95
        return len;
96
    }else if (ast->dshow_block_align){
97
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
98
    }else
99
        return 1;
100
}
101

    
102
static int get_riff(AVFormatContext *s, ByteIOContext *pb)
103
{
104
    AVIContext *avi = s->priv_data;
105
    char header[8];
106
    int i;
107

    
108
    /* check RIFF header */
109
    get_buffer(pb, header, 4);
110
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
111
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
112
    get_buffer(pb, header+4, 4);
113

    
114
    for(i=0; avi_headers[i][0]; i++)
115
        if(!memcmp(header, avi_headers[i], 8))
116
            break;
117
    if(!avi_headers[i][0])
118
        return -1;
119

    
120
    if(header[7] == 0x19)
121
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
122

    
123
    return 0;
124
}
125

    
126
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
127
    AVIContext *avi = s->priv_data;
128
    ByteIOContext *pb = s->pb;
129
    int longs_pre_entry= get_le16(pb);
130
    int index_sub_type = get_byte(pb);
131
    int index_type     = get_byte(pb);
132
    int entries_in_use = get_le32(pb);
133
    int chunk_id       = get_le32(pb);
134
    int64_t base       = get_le64(pb);
135
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
136
    AVStream *st;
137
    AVIStream *ast;
138
    int i;
139
    int64_t last_pos= -1;
140
    int64_t filesize= url_fsize(s->pb);
141

    
142
#ifdef DEBUG_SEEK
143
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
144
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
145
#endif
146

    
147
    if(stream_id >= s->nb_streams || stream_id < 0)
148
        return -1;
149
    st= s->streams[stream_id];
150
    ast = st->priv_data;
151

    
152
    if(index_sub_type)
153
        return -1;
154

    
155
    get_le32(pb);
156

    
157
    if(index_type && longs_pre_entry != 2)
158
        return -1;
159
    if(index_type>1)
160
        return -1;
161

    
162
    if(filesize > 0 && base >= filesize){
163
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
164
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
165
            base &= 0xFFFFFFFF;
166
        else
167
            return -1;
168
    }
169

    
170
    for(i=0; i<entries_in_use; i++){
171
        if(index_type){
172
            int64_t pos= get_le32(pb) + base - 8;
173
            int len    = get_le32(pb);
174
            int key= len >= 0;
175
            len &= 0x7FFFFFFF;
176

    
177
#ifdef DEBUG_SEEK
178
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
179
#endif
180
            if(url_feof(pb))
181
                return -1;
182

    
183
            if(last_pos == pos || pos == base - 8)
184
                avi->non_interleaved= 1;
185
            if(last_pos != pos && (len || !ast->sample_size))
186
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
187

    
188
            ast->cum_len += get_duration(ast, len);
189
            last_pos= pos;
190
        }else{
191
            int64_t offset, pos;
192
            int duration;
193
            offset = get_le64(pb);
194
            get_le32(pb);       /* size */
195
            duration = get_le32(pb);
196

    
197
            if(url_feof(pb))
198
                return -1;
199

    
200
            pos = url_ftell(pb);
201

    
202
            if(avi->odml_depth > MAX_ODML_DEPTH){
203
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
204
                return -1;
205
            }
206

    
207
            url_fseek(pb, offset+8, SEEK_SET);
208
            avi->odml_depth++;
209
            read_braindead_odml_indx(s, frame_num);
210
            avi->odml_depth--;
211
            frame_num += duration;
212

    
213
            url_fseek(pb, pos, SEEK_SET);
214
        }
215
    }
216
    avi->index_loaded=1;
217
    return 0;
218
}
219

    
220
static void clean_index(AVFormatContext *s){
221
    int i;
222
    int64_t j;
223

    
224
    for(i=0; i<s->nb_streams; i++){
225
        AVStream *st = s->streams[i];
226
        AVIStream *ast = st->priv_data;
227
        int n= st->nb_index_entries;
228
        int max= ast->sample_size;
229
        int64_t pos, size, ts;
230

    
231
        if(n != 1 || ast->sample_size==0)
232
            continue;
233

    
234
        while(max < 1024) max+=max;
235

    
236
        pos= st->index_entries[0].pos;
237
        size= st->index_entries[0].size;
238
        ts= st->index_entries[0].timestamp;
239

    
240
        for(j=0; j<size; j+=max){
241
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
242
        }
243
    }
244
}
245

    
246
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
247
{
248
    ByteIOContext *pb = s->pb;
249
    char key[5] = {0}, *value;
250

    
251
    size += (size & 1);
252

    
253
    if (size == UINT_MAX)
254
        return -1;
255
    value = av_malloc(size+1);
256
    if (!value)
257
        return -1;
258
    get_buffer(pb, value, size);
259
    value[size]=0;
260

    
261
    AV_WL32(key, tag);
262

    
263
    if(st)
264
        return av_metadata_set2(&st->metadata, key, value,
265
                                    AV_METADATA_DONT_STRDUP_VAL);
266
    else
267
    return av_metadata_set2(&s->metadata, key, value,
268
                                  AV_METADATA_DONT_STRDUP_VAL);
269
}
270

    
271
static void avi_read_info(AVFormatContext *s, uint64_t end)
272
{
273
    while (url_ftell(s->pb) < end) {
274
        uint32_t tag  = get_le32(s->pb);
275
        uint32_t size = get_le32(s->pb);
276
        avi_read_tag(s, NULL, tag, size);
277
    }
278
}
279

    
280
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
281
{
282
    AVIContext *avi = s->priv_data;
283
    ByteIOContext *pb = s->pb;
284
    unsigned int tag, tag1, handler;
285
    int codec_type, stream_index, frame_period, bit_rate;
286
    unsigned int size;
287
    int i;
288
    AVStream *st;
289
    AVIStream *ast = NULL;
290
    int avih_width=0, avih_height=0;
291
    int amv_file_format=0;
292
    uint64_t list_end = 0;
293

    
294
    avi->stream_index= -1;
295

    
296
    if (get_riff(s, pb) < 0)
297
        return -1;
298

    
299
    avi->fsize = url_fsize(pb);
300
    if(avi->fsize<=0)
301
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
302

    
303
    /* first list tag */
304
    stream_index = -1;
305
    codec_type = -1;
306
    frame_period = 0;
307
    for(;;) {
308
        if (url_feof(pb))
309
            goto fail;
310
        tag = get_le32(pb);
311
        size = get_le32(pb);
312
#ifdef DEBUG
313
        print_tag("tag", tag, size);
314
#endif
315

    
316
        switch(tag) {
317
        case MKTAG('L', 'I', 'S', 'T'):
318
            list_end = url_ftell(pb) + size;
319
            /* Ignored, except at start of video packets. */
320
            tag1 = get_le32(pb);
321
#ifdef DEBUG
322
            print_tag("list", tag1, 0);
323
#endif
324
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
325
                avi->movi_list = url_ftell(pb) - 4;
326
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
327
                else     avi->movi_end = url_fsize(pb);
328
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
329
                goto end_of_header;
330
            }
331
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
332
                avi_read_info(s, list_end);
333

    
334
            break;
335
        case MKTAG('d', 'm', 'l', 'h'):
336
            avi->is_odml = 1;
337
            url_fskip(pb, size + (size & 1));
338
            break;
339
        case MKTAG('a', 'm', 'v', 'h'):
340
            amv_file_format=1;
341
        case MKTAG('a', 'v', 'i', 'h'):
342
            /* AVI header */
343
            /* using frame_period is bad idea */
344
            frame_period = get_le32(pb);
345
            bit_rate = get_le32(pb) * 8;
346
            get_le32(pb);
347
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
348

    
349
            url_fskip(pb, 2 * 4);
350
            get_le32(pb);
351
            get_le32(pb);
352
            avih_width=get_le32(pb);
353
            avih_height=get_le32(pb);
354

    
355
            url_fskip(pb, size - 10 * 4);
356
            break;
357
        case MKTAG('s', 't', 'r', 'h'):
358
            /* stream header */
359

    
360
            tag1 = get_le32(pb);
361
            handler = get_le32(pb); /* codec tag */
362

    
363
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
364
                url_fskip(pb, size - 8);
365
                break;
366
            }else{
367
                stream_index++;
368
                st = av_new_stream(s, stream_index);
369
                if (!st)
370
                    goto fail;
371

    
372
                ast = av_mallocz(sizeof(AVIStream));
373
                if (!ast)
374
                    goto fail;
375
                st->priv_data = ast;
376
            }
377
            if(amv_file_format)
378
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
379

    
380
#ifdef DEBUG
381
            print_tag("strh", tag1, -1);
382
#endif
383
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
384
                int64_t dv_dur;
385

    
386
                /*
387
                 * After some consideration -- I don't think we
388
                 * have to support anything but DV in type1 AVIs.
389
                 */
390
                if (s->nb_streams != 1)
391
                    goto fail;
392

    
393
                if (handler != MKTAG('d', 'v', 's', 'd') &&
394
                    handler != MKTAG('d', 'v', 'h', 'd') &&
395
                    handler != MKTAG('d', 'v', 's', 'l'))
396
                   goto fail;
397

    
398
                ast = s->streams[0]->priv_data;
399
                av_freep(&s->streams[0]->codec->extradata);
400
                av_freep(&s->streams[0]);
401
                s->nb_streams = 0;
402
                if (CONFIG_DV_DEMUXER) {
403
                    avi->dv_demux = dv_init_demux(s);
404
                    if (!avi->dv_demux)
405
                        goto fail;
406
                }
407
                s->streams[0]->priv_data = ast;
408
                url_fskip(pb, 3 * 4);
409
                ast->scale = get_le32(pb);
410
                ast->rate = get_le32(pb);
411
                url_fskip(pb, 4);  /* start time */
412

    
413
                dv_dur = get_le32(pb);
414
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
415
                    dv_dur *= AV_TIME_BASE;
416
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
417
                }
418
                /*
419
                 * else, leave duration alone; timing estimation in utils.c
420
                 *      will make a guess based on bitrate.
421
                 */
422

    
423
                stream_index = s->nb_streams - 1;
424
                url_fskip(pb, size - 9*4);
425
                break;
426
            }
427

    
428
            assert(stream_index < s->nb_streams);
429
            st->codec->stream_codec_tag= handler;
430

    
431
            get_le32(pb); /* flags */
432
            get_le16(pb); /* priority */
433
            get_le16(pb); /* language */
434
            get_le32(pb); /* initial frame */
435
            ast->scale = get_le32(pb);
436
            ast->rate = get_le32(pb);
437
            if(!(ast->scale && ast->rate)){
438
                av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
439
                if(frame_period){
440
                    ast->rate = 1000000;
441
                    ast->scale = frame_period;
442
                }else{
443
                    ast->rate = 25;
444
                    ast->scale = 1;
445
                }
446
            }
447
            av_set_pts_info(st, 64, ast->scale, ast->rate);
448

    
449
            ast->cum_len=get_le32(pb); /* start */
450
            st->nb_frames = get_le32(pb);
451

    
452
            st->start_time = 0;
453
            get_le32(pb); /* buffer size */
454
            get_le32(pb); /* quality */
455
            ast->sample_size = get_le32(pb); /* sample ssize */
456
            ast->cum_len *= FFMAX(1, ast->sample_size);
457
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
458

    
459
            switch(tag1) {
460
            case MKTAG('v', 'i', 'd', 's'):
461
                codec_type = AVMEDIA_TYPE_VIDEO;
462

    
463
                ast->sample_size = 0;
464
                break;
465
            case MKTAG('a', 'u', 'd', 's'):
466
                codec_type = AVMEDIA_TYPE_AUDIO;
467
                break;
468
            case MKTAG('t', 'x', 't', 's'):
469
                //FIXME
470
                codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ?  FIXME
471
                break;
472
            case MKTAG('d', 'a', 't', 's'):
473
                codec_type = AVMEDIA_TYPE_DATA;
474
                break;
475
            default:
476
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
477
                goto fail;
478
            }
479
            if(ast->sample_size == 0)
480
                st->duration = st->nb_frames;
481
            ast->frame_offset= ast->cum_len;
482
            url_fskip(pb, size - 12 * 4);
483
            break;
484
        case MKTAG('s', 't', 'r', 'f'):
485
            /* stream header */
486
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
487
                url_fskip(pb, size);
488
            } else {
489
                uint64_t cur_pos = url_ftell(pb);
490
                if (cur_pos < list_end)
491
                    size = FFMIN(size, list_end - cur_pos);
492
                st = s->streams[stream_index];
493
                switch(codec_type) {
494
                case AVMEDIA_TYPE_VIDEO:
495
                    if(amv_file_format){
496
                        st->codec->width=avih_width;
497
                        st->codec->height=avih_height;
498
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
499
                        st->codec->codec_id = CODEC_ID_AMV;
500
                        url_fskip(pb, size);
501
                        break;
502
                    }
503
                    get_le32(pb); /* size */
504
                    st->codec->width = get_le32(pb);
505
                    st->codec->height = (int32_t)get_le32(pb);
506
                    get_le16(pb); /* panes */
507
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
508
                    tag1 = get_le32(pb);
509
                    get_le32(pb); /* ImageSize */
510
                    get_le32(pb); /* XPelsPerMeter */
511
                    get_le32(pb); /* YPelsPerMeter */
512
                    get_le32(pb); /* ClrUsed */
513
                    get_le32(pb); /* ClrImportant */
514

    
515
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
516
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
517
                        st->codec->codec_tag = tag1;
518
                        st->codec->codec_id = CODEC_ID_XSUB;
519
                        break;
520
                    }
521

    
522
                    if(size > 10*4 && size<(1<<30)){
523
                        st->codec->extradata_size= size - 10*4;
524
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
525
                        if (!st->codec->extradata) {
526
                            st->codec->extradata_size= 0;
527
                            return AVERROR(ENOMEM);
528
                        }
529
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
530
                    }
531

    
532
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
533
                        get_byte(pb);
534

    
535
                    /* Extract palette from extradata if bpp <= 8. */
536
                    /* This code assumes that extradata contains only palette. */
537
                    /* This is true for all paletted codecs implemented in FFmpeg. */
538
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
539
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
540
#if HAVE_BIGENDIAN
541
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
542
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
543
#else
544
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
545
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
546
#endif
547
                        st->codec->palctrl->palette_changed = 1;
548
                    }
549

    
550
#ifdef DEBUG
551
                    print_tag("video", tag1, 0);
552
#endif
553
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
554
                    st->codec->codec_tag = tag1;
555
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
556
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
557
                    // Support "Resolution 1:1" for Avid AVI Codec
558
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
559
                       st->codec->extradata_size >= 31 &&
560
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
561
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
562

    
563
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
564
                        st->codec->extradata_size+= 9;
565
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
566
                        if(st->codec->extradata)
567
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
568
                    }
569
                    st->codec->height= FFABS(st->codec->height);
570

    
571
//                    url_fskip(pb, size - 5 * 4);
572
                    break;
573
                case AVMEDIA_TYPE_AUDIO:
574
                    ff_get_wav_header(pb, st->codec, size);
575
                    ast->dshow_block_align= st->codec->block_align;
576
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
577
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
578
                        ast->sample_size= st->codec->block_align;
579
                    }
580
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
581
                        url_fskip(pb, 1);
582
                    /* Force parsing as several audio frames can be in
583
                     * one packet and timestamps refer to packet start. */
584
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
585
                    /* ADTS header is in extradata, AAC without header must be
586
                     * stored as exact frames. Parser not needed and it will
587
                     * fail. */
588
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
589
                        st->need_parsing = AVSTREAM_PARSE_NONE;
590
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
591
                     * audio in the header but have Axan as stream_code_tag. */
592
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
593
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
594
                        st->codec->codec_tag = 0;
595
                    }
596
                    if (amv_file_format){
597
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
598
                        ast->dshow_block_align = 0;
599
                    }
600
                    break;
601
                default:
602
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
603
                    st->codec->codec_id= CODEC_ID_NONE;
604
                    st->codec->codec_tag= 0;
605
                    url_fskip(pb, size);
606
                    break;
607
                }
608
            }
609
            break;
610
        case MKTAG('i', 'n', 'd', 'x'):
611
            i= url_ftell(pb);
612
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
613
                read_braindead_odml_indx(s, 0);
614
            }
615
            url_fseek(pb, i+size, SEEK_SET);
616
            break;
617
        case MKTAG('v', 'p', 'r', 'p'):
618
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
619
                AVRational active, active_aspect;
620

    
621
                st = s->streams[stream_index];
622
                get_le32(pb);
623
                get_le32(pb);
624
                get_le32(pb);
625
                get_le32(pb);
626
                get_le32(pb);
627

    
628
                active_aspect.den= get_le16(pb);
629
                active_aspect.num= get_le16(pb);
630
                active.num       = get_le32(pb);
631
                active.den       = get_le32(pb);
632
                get_le32(pb); //nbFieldsPerFrame
633

    
634
                if(active_aspect.num && active_aspect.den && active.num && active.den){
635
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
636
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
637
                }
638
                size -= 9*4;
639
            }
640
            url_fseek(pb, size, SEEK_CUR);
641
            break;
642
        case MKTAG('s', 't', 'r', 'n'):
643
            if(s->nb_streams){
644
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
645
                break;
646
            }
647
        default:
648
            if(size > 1000000){
649
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
650
                                        "I will ignore it and try to continue anyway.\n");
651
                avi->movi_list = url_ftell(pb) - 4;
652
                avi->movi_end  = url_fsize(pb);
653
                goto end_of_header;
654
            }
655
            /* skip tag */
656
            size += (size & 1);
657
            url_fskip(pb, size);
658
            break;
659
        }
660
    }
661
 end_of_header:
662
    /* check stream number */
663
    if (stream_index != s->nb_streams - 1) {
664
    fail:
665
        return -1;
666
    }
667

    
668
    if(!avi->index_loaded && !url_is_streamed(pb))
669
        avi_load_index(s);
670
    avi->index_loaded = 1;
671
    avi->non_interleaved |= guess_ni_flag(s);
672
    for(i=0; i<s->nb_streams; i++){
673
        AVStream *st = s->streams[i];
674
        if(st->nb_index_entries)
675
            break;
676
    }
677
    if(i==s->nb_streams && avi->non_interleaved) {
678
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
679
        avi->non_interleaved=0;
680
    }
681

    
682
    if(avi->non_interleaved) {
683
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
684
        clean_index(s);
685
    }
686

    
687
    return 0;
688
}
689

    
690
static int get_stream_idx(int *d){
691
    if(    d[0] >= '0' && d[0] <= '9'
692
        && d[1] >= '0' && d[1] <= '9'){
693
        return (d[0] - '0') * 10 + (d[1] - '0');
694
    }else{
695
        return 100; //invalid stream ID
696
    }
697
}
698

    
699
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
700
{
701
    AVIContext *avi = s->priv_data;
702
    ByteIOContext *pb = s->pb;
703
    int n, d[8];
704
    unsigned int size;
705
    int64_t i, sync;
706
    void* dstr;
707

    
708
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
709
        int size = dv_get_packet(avi->dv_demux, pkt);
710
        if (size >= 0)
711
            return size;
712
    }
713

    
714
    if(avi->non_interleaved){
715
        int best_stream_index = 0;
716
        AVStream *best_st= NULL;
717
        AVIStream *best_ast;
718
        int64_t best_ts= INT64_MAX;
719
        int i;
720

    
721
        for(i=0; i<s->nb_streams; i++){
722
            AVStream *st = s->streams[i];
723
            AVIStream *ast = st->priv_data;
724
            int64_t ts= ast->frame_offset;
725
            int64_t last_ts;
726

    
727
            if(!st->nb_index_entries)
728
                continue;
729

    
730
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
731
            if(!ast->remaining && ts > last_ts)
732
                continue;
733

    
734
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
735

    
736
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
737
            if(ts < best_ts){
738
                best_ts= ts;
739
                best_st= st;
740
                best_stream_index= i;
741
            }
742
        }
743
        if(!best_st)
744
            return -1;
745

    
746
        best_ast = best_st->priv_data;
747
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
748
        if(best_ast->remaining)
749
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
750
        else{
751
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
752
            if(i>=0)
753
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
754
        }
755

    
756
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
757
        if(i>=0){
758
            int64_t pos= best_st->index_entries[i].pos;
759
            pos += best_ast->packet_size - best_ast->remaining;
760
            url_fseek(s->pb, pos + 8, SEEK_SET);
761
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
762

    
763
            assert(best_ast->remaining <= best_ast->packet_size);
764

    
765
            avi->stream_index= best_stream_index;
766
            if(!best_ast->remaining)
767
                best_ast->packet_size=
768
                best_ast->remaining= best_st->index_entries[i].size;
769
        }
770
    }
771

    
772
resync:
773
    if(avi->stream_index >= 0){
774
        AVStream *st= s->streams[ avi->stream_index ];
775
        AVIStream *ast= st->priv_data;
776
        int size, err;
777

    
778
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
779
            size= INT_MAX;
780
        else if(ast->sample_size < 32)
781
            // arbitrary multiplier to avoid tiny packets for raw PCM data
782
            size= 1024*ast->sample_size;
783
        else
784
            size= ast->sample_size;
785

    
786
        if(size > ast->remaining)
787
            size= ast->remaining;
788
        avi->last_pkt_pos= url_ftell(pb);
789
        err= av_get_packet(pb, pkt, size);
790
        if(err<0)
791
            return err;
792

    
793
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
794
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
795
            if(ptr){
796
            ast->has_pal=0;
797
            pkt->size += 4*256;
798
            pkt->data= ptr;
799
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
800
            }else
801
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
802
        }
803

    
804
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
805
            dstr = pkt->destruct;
806
            size = dv_produce_packet(avi->dv_demux, pkt,
807
                                    pkt->data, pkt->size);
808
            pkt->destruct = dstr;
809
            pkt->flags |= AV_PKT_FLAG_KEY;
810
        } else {
811
            /* XXX: How to handle B-frames in AVI? */
812
            pkt->dts = ast->frame_offset;
813
//                pkt->dts += ast->start;
814
            if(ast->sample_size)
815
                pkt->dts /= ast->sample_size;
816
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
817
            pkt->stream_index = avi->stream_index;
818

    
819
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
820
                AVIndexEntry *e;
821
                int index;
822
                assert(st->index_entries);
823

    
824
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
825
                e= &st->index_entries[index];
826

    
827
                if(index >= 0 && e->timestamp == ast->frame_offset){
828
                    if (e->flags & AVINDEX_KEYFRAME)
829
                        pkt->flags |= AV_PKT_FLAG_KEY;
830
                }
831
            } else {
832
                pkt->flags |= AV_PKT_FLAG_KEY;
833
            }
834
            ast->frame_offset += get_duration(ast, pkt->size);
835
        }
836
        ast->remaining -= size;
837
        if(!ast->remaining){
838
            avi->stream_index= -1;
839
            ast->packet_size= 0;
840
        }
841

    
842
        return size;
843
    }
844

    
845
    memset(d, -1, sizeof(int)*8);
846
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
847
        int j;
848

    
849
        for(j=0; j<7; j++)
850
            d[j]= d[j+1];
851
        d[7]= get_byte(pb);
852

    
853
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
854

    
855
        n= get_stream_idx(d+2);
856
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
857
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
858
            continue;
859

    
860
        //parse ix##
861
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
862
        //parse JUNK
863
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
864
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
865
            url_fskip(pb, size);
866
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
867
            goto resync;
868
        }
869

    
870
        //parse stray LIST
871
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
872
            url_fskip(pb, 4);
873
            goto resync;
874
        }
875

    
876
        n= get_stream_idx(d);
877

    
878
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
879
            continue;
880

    
881
        //detect ##ix chunk and skip
882
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
883
            url_fskip(pb, size);
884
            goto resync;
885
        }
886

    
887
        //parse ##dc/##wb
888
        if(n < s->nb_streams){
889
            AVStream *st;
890
            AVIStream *ast;
891
            st = s->streams[n];
892
            ast = st->priv_data;
893

    
894
            if(s->nb_streams>=2){
895
                AVStream *st1  = s->streams[1];
896
                AVIStream *ast1= st1->priv_data;
897
                //workaround for broken small-file-bug402.avi
898
                if(   d[2] == 'w' && d[3] == 'b'
899
                   && n==0
900
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
901
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
902
                   && ast->prefix == 'd'*256+'c'
903
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
904
                  ){
905
                    n=1;
906
                    st = st1;
907
                    ast = ast1;
908
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
909
                }
910
            }
911

    
912

    
913
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
914
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
915
               || st->discard >= AVDISCARD_ALL){
916
                ast->frame_offset += get_duration(ast, size);
917
                url_fskip(pb, size);
918
                goto resync;
919
            }
920

    
921
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
922
                int k = get_byte(pb);
923
                int last = (k + get_byte(pb) - 1) & 0xFF;
924

    
925
                get_le16(pb); //flags
926

    
927
                for (; k <= last; k++)
928
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
929
                ast->has_pal= 1;
930
                goto resync;
931
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
932
                         d[2]*256+d[3] == ast->prefix /*||
933
                         (d[2] == 'd' && d[3] == 'c') ||
934
                         (d[2] == 'w' && d[3] == 'b')*/) {
935

    
936
//av_log(s, AV_LOG_DEBUG, "OK\n");
937
                if(d[2]*256+d[3] == ast->prefix)
938
                    ast->prefix_count++;
939
                else{
940
                    ast->prefix= d[2]*256+d[3];
941
                    ast->prefix_count= 0;
942
                }
943

    
944
                avi->stream_index= n;
945
                ast->packet_size= size + 8;
946
                ast->remaining= size;
947

    
948
                if(size || !ast->sample_size){
949
                    uint64_t pos= url_ftell(pb) - 8;
950
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
951
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
952
                    }
953
                }
954
                goto resync;
955
            }
956
        }
957
    }
958

    
959
    return AVERROR_EOF;
960
}
961

    
962
/* XXX: We make the implicit supposition that the positions are sorted
963
   for each stream. */
964
static int avi_read_idx1(AVFormatContext *s, int size)
965
{
966
    AVIContext *avi = s->priv_data;
967
    ByteIOContext *pb = s->pb;
968
    int nb_index_entries, i;
969
    AVStream *st;
970
    AVIStream *ast;
971
    unsigned int index, tag, flags, pos, len;
972
    unsigned last_pos= -1;
973

    
974
    nb_index_entries = size / 16;
975
    if (nb_index_entries <= 0)
976
        return -1;
977

    
978
    /* Read the entries and sort them in each stream component. */
979
    for(i = 0; i < nb_index_entries; i++) {
980
        tag = get_le32(pb);
981
        flags = get_le32(pb);
982
        pos = get_le32(pb);
983
        len = get_le32(pb);
984
#if defined(DEBUG_SEEK)
985
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
986
               i, tag, flags, pos, len);
987
#endif
988
        if(i==0 && pos > avi->movi_list)
989
            avi->movi_list= 0; //FIXME better check
990
        pos += avi->movi_list;
991

    
992
        index = ((tag & 0xff) - '0') * 10;
993
        index += ((tag >> 8) & 0xff) - '0';
994
        if (index >= s->nb_streams)
995
            continue;
996
        st = s->streams[index];
997
        ast = st->priv_data;
998

    
999
#if defined(DEBUG_SEEK)
1000
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1001
#endif
1002
        if(url_feof(pb))
1003
            return -1;
1004

    
1005
        if(last_pos == pos)
1006
            avi->non_interleaved= 1;
1007
        else if(len || !ast->sample_size)
1008
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1009
        ast->cum_len += get_duration(ast, len);
1010
        last_pos= pos;
1011
    }
1012
    return 0;
1013
}
1014

    
1015
static int guess_ni_flag(AVFormatContext *s){
1016
    int i;
1017
    int64_t last_start=0;
1018
    int64_t first_end= INT64_MAX;
1019
    int64_t oldpos= url_ftell(s->pb);
1020

    
1021
    for(i=0; i<s->nb_streams; i++){
1022
        AVStream *st = s->streams[i];
1023
        int n= st->nb_index_entries;
1024
        unsigned int size;
1025

    
1026
        if(n <= 0)
1027
            continue;
1028

    
1029
        if(n >= 2){
1030
            int64_t pos= st->index_entries[0].pos;
1031
            url_fseek(s->pb, pos + 4, SEEK_SET);
1032
            size= get_le32(s->pb);
1033
            if(pos + size > st->index_entries[1].pos)
1034
                last_start= INT64_MAX;
1035
        }
1036

    
1037
        if(st->index_entries[0].pos > last_start)
1038
            last_start= st->index_entries[0].pos;
1039
        if(st->index_entries[n-1].pos < first_end)
1040
            first_end= st->index_entries[n-1].pos;
1041
    }
1042
    url_fseek(s->pb, oldpos, SEEK_SET);
1043
    return last_start > first_end;
1044
}
1045

    
1046
static int avi_load_index(AVFormatContext *s)
1047
{
1048
    AVIContext *avi = s->priv_data;
1049
    ByteIOContext *pb = s->pb;
1050
    uint32_t tag, size;
1051
    int64_t pos= url_ftell(pb);
1052
    int ret = -1;
1053

    
1054
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1055
        goto the_end; // maybe truncated file
1056
#ifdef DEBUG_SEEK
1057
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1058
#endif
1059
    for(;;) {
1060
        if (url_feof(pb))
1061
            break;
1062
        tag = get_le32(pb);
1063
        size = get_le32(pb);
1064
#ifdef DEBUG_SEEK
1065
        printf("tag=%c%c%c%c size=0x%x\n",
1066
               tag & 0xff,
1067
               (tag >> 8) & 0xff,
1068
               (tag >> 16) & 0xff,
1069
               (tag >> 24) & 0xff,
1070
               size);
1071
#endif
1072
        switch(tag) {
1073
        case MKTAG('i', 'd', 'x', '1'):
1074
            if (avi_read_idx1(s, size) < 0)
1075
                goto skip;
1076
            ret = 0;
1077
                goto the_end;
1078
            break;
1079
        default:
1080
        skip:
1081
            size += (size & 1);
1082
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1083
                goto the_end; // something is wrong here
1084
            break;
1085
        }
1086
    }
1087
 the_end:
1088
    url_fseek(pb, pos, SEEK_SET);
1089
    return ret;
1090
}
1091

    
1092
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1093
{
1094
    AVIContext *avi = s->priv_data;
1095
    AVStream *st;
1096
    int i, index;
1097
    int64_t pos;
1098
    AVIStream *ast;
1099

    
1100
    if (!avi->index_loaded) {
1101
        /* we only load the index on demand */
1102
        avi_load_index(s);
1103
        avi->index_loaded = 1;
1104
    }
1105
    assert(stream_index>= 0);
1106

    
1107
    st = s->streams[stream_index];
1108
    ast= st->priv_data;
1109
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1110
    if(index<0)
1111
        return -1;
1112

    
1113
    /* find the position */
1114
    pos = st->index_entries[index].pos;
1115
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1116

    
1117
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1118

    
1119
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1120
        /* One and only one real stream for DV in AVI, and it has video  */
1121
        /* offsets. Calling with other stream indexes should have failed */
1122
        /* the av_index_search_timestamp call above.                     */
1123
        assert(stream_index == 0);
1124

    
1125
        /* Feed the DV video stream version of the timestamp to the */
1126
        /* DV demux so it can synthesize correct timestamps.        */
1127
        dv_offset_reset(avi->dv_demux, timestamp);
1128

    
1129
        url_fseek(s->pb, pos, SEEK_SET);
1130
        avi->stream_index= -1;
1131
        return 0;
1132
    }
1133

    
1134
    for(i = 0; i < s->nb_streams; i++) {
1135
        AVStream *st2 = s->streams[i];
1136
        AVIStream *ast2 = st2->priv_data;
1137

    
1138
        ast2->packet_size=
1139
        ast2->remaining= 0;
1140

    
1141
        if (st2->nb_index_entries <= 0)
1142
            continue;
1143

    
1144
//        assert(st2->codec->block_align);
1145
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1146
        index = av_index_search_timestamp(
1147
                st2,
1148
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1149
                flags | AVSEEK_FLAG_BACKWARD);
1150
        if(index<0)
1151
            index=0;
1152

    
1153
        if(!avi->non_interleaved){
1154
            while(index>0 && st2->index_entries[index].pos > pos)
1155
                index--;
1156
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1157
                index++;
1158
        }
1159

    
1160
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1161
        /* extract the current frame number */
1162
        ast2->frame_offset = st2->index_entries[index].timestamp;
1163
    }
1164

    
1165
    /* do the seek */
1166
    url_fseek(s->pb, pos, SEEK_SET);
1167
    avi->stream_index= -1;
1168
    return 0;
1169
}
1170

    
1171
static int avi_read_close(AVFormatContext *s)
1172
{
1173
    int i;
1174
    AVIContext *avi = s->priv_data;
1175

    
1176
    for(i=0;i<s->nb_streams;i++) {
1177
        AVStream *st = s->streams[i];
1178
        av_free(st->codec->palctrl);
1179
    }
1180

    
1181
    if (avi->dv_demux)
1182
        av_free(avi->dv_demux);
1183

    
1184
    return 0;
1185
}
1186

    
1187
static int avi_probe(AVProbeData *p)
1188
{
1189
    int i;
1190

    
1191
    /* check file header */
1192
    for(i=0; avi_headers[i][0]; i++)
1193
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1194
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1195
            return AVPROBE_SCORE_MAX;
1196

    
1197
    return 0;
1198
}
1199

    
1200
AVInputFormat avi_demuxer = {
1201
    "avi",
1202
    NULL_IF_CONFIG_SMALL("AVI format"),
1203
    sizeof(AVIContext),
1204
    avi_probe,
1205
    avi_read_header,
1206
    avi_read_packet,
1207
    avi_read_close,
1208
    avi_read_seek,
1209
    .metadata_conv = ff_avi_metadata_conv,
1210
};