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ffmpeg / libavformat / avidec.c @ ffdc49df

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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 <strings.h>
26
#include "libavutil/intreadwrite.h"
27
#include "libavutil/bswap.h"
28
#include "libavutil/opt.h"
29
#include "avformat.h"
30
#include "avi.h"
31
#include "dv.h"
32
#include "riff.h"
33

    
34
#undef NDEBUG
35
#include <assert.h>
36

    
37
typedef struct AVIStream {
38
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
39
                         (used to compute the pts) */
40
    int remaining;
41
    int packet_size;
42

    
43
    int scale;
44
    int rate;
45
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
46

    
47
    int64_t cum_len; /* temporary storage (used during seek) */
48

    
49
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
50
    int prefix_count;
51
    uint32_t pal[256];
52
    int has_pal;
53
    int dshow_block_align;            ///< block align variable used to emulate bugs in the MS dshow demuxer
54

    
55
    AVFormatContext *sub_ctx;
56
    AVPacket sub_pkt;
57
    uint8_t *sub_buffer;
58

    
59
    int64_t seek_pos;
60
} AVIStream;
61

    
62
typedef struct {
63
    const AVClass *class;
64
    int64_t  riff_end;
65
    int64_t  movi_end;
66
    int64_t  fsize;
67
    int64_t movi_list;
68
    int64_t last_pkt_pos;
69
    int index_loaded;
70
    int is_odml;
71
    int non_interleaved;
72
    int stream_index;
73
    DVDemuxContext* dv_demux;
74
    int odml_depth;
75
    int use_odml;
76
#define MAX_ODML_DEPTH 1000
77
} AVIContext;
78

    
79

    
80
static const AVOption options[] = {
81
    { "use_odml", "use odml index", offsetof(AVIContext, use_odml), FF_OPT_TYPE_INT, 1, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
82
    { NULL },
83
};
84

    
85
static const AVClass demuxer_class = {
86
    "AVI demuxer",
87
    av_default_item_name,
88
    options,
89
    LIBAVUTIL_VERSION_INT,
90
};
91

    
92

    
93
static const char avi_headers[][8] = {
94
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
95
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
96
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
97
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
98
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
99
    { 0 }
100
};
101

    
102
static int avi_load_index(AVFormatContext *s);
103
static int guess_ni_flag(AVFormatContext *s);
104

    
105
#define print_tag(str, tag, size)                       \
106
    av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
107
           str, tag & 0xff,                             \
108
           (tag >> 8) & 0xff,                           \
109
           (tag >> 16) & 0xff,                          \
110
           (tag >> 24) & 0xff,                          \
111
           size)
112

    
113
static inline int get_duration(AVIStream *ast, int len){
114
    if(ast->sample_size){
115
        return len;
116
    }else if (ast->dshow_block_align){
117
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
118
    }else
119
        return 1;
120
}
121

    
122
static int get_riff(AVFormatContext *s, AVIOContext *pb)
123
{
124
    AVIContext *avi = s->priv_data;
125
    char header[8];
126
    int i;
127

    
128
    /* check RIFF header */
129
    avio_read(pb, header, 4);
130
    avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */
131
    avi->riff_end += avio_tell(pb); /* RIFF chunk end */
132
    avio_read(pb, header+4, 4);
133

    
134
    for(i=0; avi_headers[i][0]; i++)
135
        if(!memcmp(header, avi_headers[i], 8))
136
            break;
137
    if(!avi_headers[i][0])
138
        return -1;
139

    
140
    if(header[7] == 0x19)
141
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
142

    
143
    return 0;
144
}
145

    
146
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
147
    AVIContext *avi = s->priv_data;
148
    AVIOContext *pb = s->pb;
149
    int longs_pre_entry= avio_rl16(pb);
150
    int index_sub_type = avio_r8(pb);
151
    int index_type     = avio_r8(pb);
152
    int entries_in_use = avio_rl32(pb);
153
    int chunk_id       = avio_rl32(pb);
154
    int64_t base       = avio_rl64(pb);
155
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
156
    AVStream *st;
157
    AVIStream *ast;
158
    int i;
159
    int64_t last_pos= -1;
160
    int64_t filesize= avio_size(s->pb);
161

    
162
#ifdef DEBUG_SEEK
163
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
164
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
165
#endif
166

    
167
    if(stream_id >= s->nb_streams || stream_id < 0)
168
        return -1;
169
    st= s->streams[stream_id];
170
    ast = st->priv_data;
171

    
172
    if(index_sub_type)
173
        return -1;
174

    
175
    avio_rl32(pb);
176

    
177
    if(index_type && longs_pre_entry != 2)
178
        return -1;
179
    if(index_type>1)
180
        return -1;
181

    
182
    if(filesize > 0 && base >= filesize){
183
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
184
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
185
            base &= 0xFFFFFFFF;
186
        else
187
            return -1;
188
    }
189

    
190
    for(i=0; i<entries_in_use; i++){
191
        if(index_type){
192
            int64_t pos= avio_rl32(pb) + base - 8;
193
            int len    = avio_rl32(pb);
194
            int key= len >= 0;
195
            len &= 0x7FFFFFFF;
196

    
197
#ifdef DEBUG_SEEK
198
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
199
#endif
200
            if(url_feof(pb))
201
                return -1;
202

    
203
            if(last_pos == pos || pos == base - 8)
204
                avi->non_interleaved= 1;
205
            if(last_pos != pos && (len || !ast->sample_size))
206
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
207

    
208
            ast->cum_len += get_duration(ast, len);
209
            last_pos= pos;
210
        }else{
211
            int64_t offset, pos;
212
            int duration;
213
            offset = avio_rl64(pb);
214
            avio_rl32(pb);       /* size */
215
            duration = avio_rl32(pb);
216

    
217
            if(url_feof(pb))
218
                return -1;
219

    
220
            pos = avio_tell(pb);
221

    
222
            if(avi->odml_depth > MAX_ODML_DEPTH){
223
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
224
                return -1;
225
            }
226

    
227
            avio_seek(pb, offset+8, SEEK_SET);
228
            avi->odml_depth++;
229
            read_braindead_odml_indx(s, frame_num);
230
            avi->odml_depth--;
231
            frame_num += duration;
232

    
233
            avio_seek(pb, pos, SEEK_SET);
234
        }
235
    }
236
    avi->index_loaded=1;
237
    return 0;
238
}
239

    
240
static void clean_index(AVFormatContext *s){
241
    int i;
242
    int64_t j;
243

    
244
    for(i=0; i<s->nb_streams; i++){
245
        AVStream *st = s->streams[i];
246
        AVIStream *ast = st->priv_data;
247
        int n= st->nb_index_entries;
248
        int max= ast->sample_size;
249
        int64_t pos, size, ts;
250

    
251
        if(n != 1 || ast->sample_size==0)
252
            continue;
253

    
254
        while(max < 1024) max+=max;
255

    
256
        pos= st->index_entries[0].pos;
257
        size= st->index_entries[0].size;
258
        ts= st->index_entries[0].timestamp;
259

    
260
        for(j=0; j<size; j+=max){
261
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
262
        }
263
    }
264
}
265

    
266
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
267
{
268
    AVIOContext *pb = s->pb;
269
    char key[5] = {0}, *value;
270

    
271
    size += (size & 1);
272

    
273
    if (size == UINT_MAX)
274
        return -1;
275
    value = av_malloc(size+1);
276
    if (!value)
277
        return -1;
278
    avio_read(pb, value, size);
279
    value[size]=0;
280

    
281
    AV_WL32(key, tag);
282

    
283
    return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
284
                            AV_METADATA_DONT_STRDUP_VAL);
285
}
286

    
287
static void avi_read_info(AVFormatContext *s, uint64_t end)
288
{
289
    while (avio_tell(s->pb) < end) {
290
        uint32_t tag  = avio_rl32(s->pb);
291
        uint32_t size = avio_rl32(s->pb);
292
        avi_read_tag(s, NULL, tag, size);
293
    }
294
}
295

    
296
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
297
                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
298

    
299
static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
300
{
301
    char month[4], time[9], buffer[64];
302
    int i, day, year;
303
    /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
304
    if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
305
               month, &day, time, &year) == 4) {
306
        for (i=0; i<12; i++)
307
            if (!strcasecmp(month, months[i])) {
308
                snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
309
                         year, i+1, day, time);
310
                av_metadata_set2(metadata, "creation_time", buffer, 0);
311
            }
312
    } else if (date[4] == '/' && date[7] == '/') {
313
        date[4] = date[7] = '-';
314
        av_metadata_set2(metadata, "creation_time", date, 0);
315
    }
316
}
317

    
318
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
319
{
320
    while (avio_tell(s->pb) < end) {
321
        uint32_t tag  = avio_rl32(s->pb);
322
        uint32_t size = avio_rl32(s->pb);
323
        switch (tag) {
324
        case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
325
            uint64_t tag_end = avio_tell(s->pb) + size;
326
            while (avio_tell(s->pb) < tag_end) {
327
                uint16_t tag  = avio_rl16(s->pb);
328
                uint16_t size = avio_rl16(s->pb);
329
                const char *name = NULL;
330
                char buffer[64] = {0};
331
                size -= avio_read(s->pb, buffer,
332
                                   FFMIN(size, sizeof(buffer)-1));
333
                switch (tag) {
334
                case 0x03:  name = "maker";  break;
335
                case 0x04:  name = "model";  break;
336
                case 0x13:  name = "creation_time";
337
                    if (buffer[4] == ':' && buffer[7] == ':')
338
                        buffer[4] = buffer[7] = '-';
339
                    break;
340
                }
341
                if (name)
342
                    av_metadata_set2(&s->metadata, name, buffer, 0);
343
                avio_skip(s->pb, size);
344
            }
345
            break;
346
        }
347
        default:
348
            avio_skip(s->pb, size);
349
            break;
350
        }
351
    }
352
}
353

    
354
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
355
{
356
    AVIContext *avi = s->priv_data;
357
    AVIOContext *pb = s->pb;
358
    unsigned int tag, tag1, handler;
359
    int codec_type, stream_index, frame_period, bit_rate;
360
    unsigned int size;
361
    int i;
362
    AVStream *st;
363
    AVIStream *ast = NULL;
364
    int avih_width=0, avih_height=0;
365
    int amv_file_format=0;
366
    uint64_t list_end = 0;
367
    int ret;
368

    
369
    avi->stream_index= -1;
370

    
371
    if (get_riff(s, pb) < 0)
372
        return -1;
373

    
374
    av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
375

    
376
    avi->fsize = avio_size(pb);
377
    if(avi->fsize<=0)
378
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
379

    
380
    /* first list tag */
381
    stream_index = -1;
382
    codec_type = -1;
383
    frame_period = 0;
384
    for(;;) {
385
        if (url_feof(pb))
386
            goto fail;
387
        tag = avio_rl32(pb);
388
        size = avio_rl32(pb);
389

    
390
        print_tag("tag", tag, size);
391

    
392
        switch(tag) {
393
        case MKTAG('L', 'I', 'S', 'T'):
394
            list_end = avio_tell(pb) + size;
395
            /* Ignored, except at start of video packets. */
396
            tag1 = avio_rl32(pb);
397

    
398
            print_tag("list", tag1, 0);
399

    
400
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
401
                avi->movi_list = avio_tell(pb) - 4;
402
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
403
                else     avi->movi_end = avio_size(pb);
404
                av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
405
                goto end_of_header;
406
            }
407
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
408
                avi_read_info(s, list_end);
409
            else if (tag1 == MKTAG('n', 'c', 'd', 't'))
410
                avi_read_nikon(s, list_end);
411

    
412
            break;
413
        case MKTAG('I', 'D', 'I', 'T'): {
414
            unsigned char date[64] = {0};
415
            size += (size & 1);
416
            size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
417
            avio_skip(pb, size);
418
            avi_metadata_creation_time(&s->metadata, date);
419
            break;
420
        }
421
        case MKTAG('d', 'm', 'l', 'h'):
422
            avi->is_odml = 1;
423
            avio_skip(pb, size + (size & 1));
424
            break;
425
        case MKTAG('a', 'm', 'v', 'h'):
426
            amv_file_format=1;
427
        case MKTAG('a', 'v', 'i', 'h'):
428
            /* AVI header */
429
            /* using frame_period is bad idea */
430
            frame_period = avio_rl32(pb);
431
            bit_rate = avio_rl32(pb) * 8;
432
            avio_rl32(pb);
433
            avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
434

    
435
            avio_skip(pb, 2 * 4);
436
            avio_rl32(pb);
437
            avio_rl32(pb);
438
            avih_width=avio_rl32(pb);
439
            avih_height=avio_rl32(pb);
440

    
441
            avio_skip(pb, size - 10 * 4);
442
            break;
443
        case MKTAG('s', 't', 'r', 'h'):
444
            /* stream header */
445

    
446
            tag1 = avio_rl32(pb);
447
            handler = avio_rl32(pb); /* codec tag */
448

    
449
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
450
                avio_skip(pb, size - 8);
451
                break;
452
            }else{
453
                stream_index++;
454
                st = av_new_stream(s, stream_index);
455
                if (!st)
456
                    goto fail;
457

    
458
                ast = av_mallocz(sizeof(AVIStream));
459
                if (!ast)
460
                    goto fail;
461
                st->priv_data = ast;
462
            }
463
            if(amv_file_format)
464
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
465

    
466
            print_tag("strh", tag1, -1);
467

    
468
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
469
                int64_t dv_dur;
470

    
471
                /*
472
                 * After some consideration -- I don't think we
473
                 * have to support anything but DV in type1 AVIs.
474
                 */
475
                if (s->nb_streams != 1)
476
                    goto fail;
477

    
478
                if (handler != MKTAG('d', 'v', 's', 'd') &&
479
                    handler != MKTAG('d', 'v', 'h', 'd') &&
480
                    handler != MKTAG('d', 'v', 's', 'l'))
481
                   goto fail;
482

    
483
                ast = s->streams[0]->priv_data;
484
                av_freep(&s->streams[0]->codec->extradata);
485
                av_freep(&s->streams[0]->codec);
486
                av_freep(&s->streams[0]);
487
                s->nb_streams = 0;
488
                if (CONFIG_DV_DEMUXER) {
489
                    avi->dv_demux = dv_init_demux(s);
490
                    if (!avi->dv_demux)
491
                        goto fail;
492
                }
493
                s->streams[0]->priv_data = ast;
494
                avio_skip(pb, 3 * 4);
495
                ast->scale = avio_rl32(pb);
496
                ast->rate = avio_rl32(pb);
497
                avio_skip(pb, 4);  /* start time */
498

    
499
                dv_dur = avio_rl32(pb);
500
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
501
                    dv_dur *= AV_TIME_BASE;
502
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
503
                }
504
                /*
505
                 * else, leave duration alone; timing estimation in utils.c
506
                 *      will make a guess based on bitrate.
507
                 */
508

    
509
                stream_index = s->nb_streams - 1;
510
                avio_skip(pb, size - 9*4);
511
                break;
512
            }
513

    
514
            assert(stream_index < s->nb_streams);
515
            st->codec->stream_codec_tag= handler;
516

    
517
            avio_rl32(pb); /* flags */
518
            avio_rl16(pb); /* priority */
519
            avio_rl16(pb); /* language */
520
            avio_rl32(pb); /* initial frame */
521
            ast->scale = avio_rl32(pb);
522
            ast->rate = avio_rl32(pb);
523
            if(!(ast->scale && ast->rate)){
524
                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);
525
                if(frame_period){
526
                    ast->rate = 1000000;
527
                    ast->scale = frame_period;
528
                }else{
529
                    ast->rate = 25;
530
                    ast->scale = 1;
531
                }
532
            }
533
            av_set_pts_info(st, 64, ast->scale, ast->rate);
534

    
535
            ast->cum_len=avio_rl32(pb); /* start */
536
            st->nb_frames = avio_rl32(pb);
537

    
538
            st->start_time = 0;
539
            avio_rl32(pb); /* buffer size */
540
            avio_rl32(pb); /* quality */
541
            ast->sample_size = avio_rl32(pb); /* sample ssize */
542
            ast->cum_len *= FFMAX(1, ast->sample_size);
543
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
544

    
545
            switch(tag1) {
546
            case MKTAG('v', 'i', 'd', 's'):
547
                codec_type = AVMEDIA_TYPE_VIDEO;
548

    
549
                ast->sample_size = 0;
550
                break;
551
            case MKTAG('a', 'u', 'd', 's'):
552
                codec_type = AVMEDIA_TYPE_AUDIO;
553
                break;
554
            case MKTAG('t', 'x', 't', 's'):
555
                codec_type = AVMEDIA_TYPE_SUBTITLE;
556
                break;
557
            case MKTAG('d', 'a', 't', 's'):
558
                codec_type = AVMEDIA_TYPE_DATA;
559
                break;
560
            default:
561
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
562
                goto fail;
563
            }
564
            if(ast->sample_size == 0)
565
                st->duration = st->nb_frames;
566
            ast->frame_offset= ast->cum_len;
567
            avio_skip(pb, size - 12 * 4);
568
            break;
569
        case MKTAG('s', 't', 'r', 'f'):
570
            /* stream header */
571
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
572
                avio_skip(pb, size);
573
            } else {
574
                uint64_t cur_pos = avio_tell(pb);
575
                if (cur_pos < list_end)
576
                    size = FFMIN(size, list_end - cur_pos);
577
                st = s->streams[stream_index];
578
                switch(codec_type) {
579
                case AVMEDIA_TYPE_VIDEO:
580
                    if(amv_file_format){
581
                        st->codec->width=avih_width;
582
                        st->codec->height=avih_height;
583
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
584
                        st->codec->codec_id = CODEC_ID_AMV;
585
                        avio_skip(pb, size);
586
                        break;
587
                    }
588
                    tag1 = ff_get_bmp_header(pb, st);
589

    
590
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
591
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
592
                        st->codec->codec_tag = tag1;
593
                        st->codec->codec_id = CODEC_ID_XSUB;
594
                        break;
595
                    }
596

    
597
                    if(size > 10*4 && size<(1<<30)){
598
                        st->codec->extradata_size= size - 10*4;
599
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
600
                        if (!st->codec->extradata) {
601
                            st->codec->extradata_size= 0;
602
                            return AVERROR(ENOMEM);
603
                        }
604
                        avio_read(pb, st->codec->extradata, st->codec->extradata_size);
605
                    }
606

    
607
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
608
                        avio_r8(pb);
609

    
610
                    /* Extract palette from extradata if bpp <= 8. */
611
                    /* This code assumes that extradata contains only palette. */
612
                    /* This is true for all paletted codecs implemented in FFmpeg. */
613
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
614
                        int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
615
                        const uint8_t *pal_src;
616

    
617
                        pal_size = FFMIN(pal_size, st->codec->extradata_size);
618
                        pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
619
#if HAVE_BIGENDIAN
620
                        for (i = 0; i < pal_size/4; i++)
621
                            ast->pal[i] = AV_RL32(pal_src+4*i);
622
#else
623
                        memcpy(ast->pal, pal_src, pal_size);
624
#endif
625
                        ast->has_pal = 1;
626
                    }
627

    
628
                    print_tag("video", tag1, 0);
629

    
630
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
631
                    st->codec->codec_tag = tag1;
632
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
633
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
634
                    // Support "Resolution 1:1" for Avid AVI Codec
635
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
636
                       st->codec->extradata_size >= 31 &&
637
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
638
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
639

    
640
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
641
                        st->codec->extradata_size+= 9;
642
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
643
                        if(st->codec->extradata)
644
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
645
                    }
646
                    st->codec->height= FFABS(st->codec->height);
647

    
648
//                    avio_skip(pb, size - 5 * 4);
649
                    break;
650
                case AVMEDIA_TYPE_AUDIO:
651
                    ret = ff_get_wav_header(pb, st->codec, size);
652
                    if (ret < 0)
653
                        return ret;
654
                    ast->dshow_block_align= st->codec->block_align;
655
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
656
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
657
                        ast->sample_size= st->codec->block_align;
658
                    }
659
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
660
                        avio_skip(pb, 1);
661
                    /* Force parsing as several audio frames can be in
662
                     * one packet and timestamps refer to packet start. */
663
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
664
                    /* ADTS header is in extradata, AAC without header must be
665
                     * stored as exact frames. Parser not needed and it will
666
                     * fail. */
667
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
668
                        st->need_parsing = AVSTREAM_PARSE_NONE;
669
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
670
                     * audio in the header but have Axan as stream_code_tag. */
671
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
672
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
673
                        st->codec->codec_tag = 0;
674
                    }
675
                    if (amv_file_format){
676
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
677
                        ast->dshow_block_align = 0;
678
                    }
679
                    break;
680
                case AVMEDIA_TYPE_SUBTITLE:
681
                    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
682
                    st->request_probe= 1;
683
                    break;
684
                default:
685
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
686
                    st->codec->codec_id= CODEC_ID_NONE;
687
                    st->codec->codec_tag= 0;
688
                    avio_skip(pb, size);
689
                    break;
690
                }
691
            }
692
            break;
693
        case MKTAG('i', 'n', 'd', 'x'):
694
            i= avio_tell(pb);
695
            if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml){
696
                read_braindead_odml_indx(s, 0);
697
            }
698
            avio_seek(pb, i+size, SEEK_SET);
699
            break;
700
        case MKTAG('v', 'p', 'r', 'p'):
701
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
702
                AVRational active, active_aspect;
703

    
704
                st = s->streams[stream_index];
705
                avio_rl32(pb);
706
                avio_rl32(pb);
707
                avio_rl32(pb);
708
                avio_rl32(pb);
709
                avio_rl32(pb);
710

    
711
                active_aspect.den= avio_rl16(pb);
712
                active_aspect.num= avio_rl16(pb);
713
                active.num       = avio_rl32(pb);
714
                active.den       = avio_rl32(pb);
715
                avio_rl32(pb); //nbFieldsPerFrame
716

    
717
                if(active_aspect.num && active_aspect.den && active.num && active.den){
718
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
719
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
720
                }
721
                size -= 9*4;
722
            }
723
            avio_skip(pb, size);
724
            break;
725
        case MKTAG('s', 't', 'r', 'n'):
726
            if(s->nb_streams){
727
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
728
                break;
729
            }
730
        default:
731
            if(size > 1000000){
732
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
733
                                        "I will ignore it and try to continue anyway.\n");
734
                avi->movi_list = avio_tell(pb) - 4;
735
                avi->movi_end  = avio_size(pb);
736
                goto end_of_header;
737
            }
738
            /* skip tag */
739
            size += (size & 1);
740
            avio_skip(pb, size);
741
            break;
742
        }
743
    }
744
 end_of_header:
745
    /* check stream number */
746
    if (stream_index != s->nb_streams - 1) {
747
    fail:
748
        return -1;
749
    }
750

    
751
    if(!avi->index_loaded && pb->seekable)
752
        avi_load_index(s);
753
    avi->index_loaded = 1;
754
    avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
755
    for(i=0; i<s->nb_streams; i++){
756
        AVStream *st = s->streams[i];
757
        if(st->nb_index_entries)
758
            break;
759
    }
760
    // DV-in-AVI cannot be non-interleaved, if set this must be
761
    // a mis-detection.
762
    if(avi->dv_demux)
763
        avi->non_interleaved=0;
764
    if(i==s->nb_streams && avi->non_interleaved) {
765
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
766
        avi->non_interleaved=0;
767
    }
768

    
769
    if(avi->non_interleaved) {
770
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
771
        clean_index(s);
772
    }
773

    
774
    ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
775

    
776
    return 0;
777
}
778

    
779
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
780
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
781
        uint8_t desc[256];
782
        int score = AVPROBE_SCORE_MAX / 2, ret;
783
        AVIStream *ast = st->priv_data;
784
        AVInputFormat *sub_demuxer;
785
        AVRational time_base;
786
        AVIOContext *pb = avio_alloc_context( pkt->data + 7,
787
                                              pkt->size - 7,
788
                                              0, NULL, NULL, NULL, NULL);
789
        AVProbeData pd;
790
        unsigned int desc_len = avio_rl32(pb);
791

    
792
        if (desc_len > pb->buf_end - pb->buf_ptr)
793
            goto error;
794

    
795
        ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
796
        avio_skip(pb, desc_len - ret);
797
        if (*desc)
798
            av_metadata_set2(&st->metadata, "title", desc, 0);
799

    
800
        avio_rl16(pb);   /* flags? */
801
        avio_rl32(pb);   /* data size */
802

    
803
        pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
804
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
805
            goto error;
806

    
807
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
808
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
809
            *st->codec = *ast->sub_ctx->streams[0]->codec;
810
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
811
            time_base = ast->sub_ctx->streams[0]->time_base;
812
            av_set_pts_info(st, 64, time_base.num, time_base.den);
813
        }
814
        ast->sub_buffer = pkt->data;
815
        memset(pkt, 0, sizeof(*pkt));
816
        return 1;
817
error:
818
        av_freep(&pb);
819
    }
820
    return 0;
821
}
822

    
823
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
824
                                  AVPacket *pkt)
825
{
826
    AVIStream *ast, *next_ast = next_st->priv_data;
827
    int64_t ts, next_ts, ts_min = INT64_MAX;
828
    AVStream *st, *sub_st = NULL;
829
    int i;
830

    
831
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
832
                           AV_TIME_BASE_Q);
833

    
834
    for (i=0; i<s->nb_streams; i++) {
835
        st  = s->streams[i];
836
        ast = st->priv_data;
837
        if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
838
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
839
            if (ts <= next_ts && ts < ts_min) {
840
                ts_min = ts;
841
                sub_st = st;
842
            }
843
        }
844
    }
845

    
846
    if (sub_st) {
847
        ast = sub_st->priv_data;
848
        *pkt = ast->sub_pkt;
849
        pkt->stream_index = sub_st->index;
850
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
851
            ast->sub_pkt.data = NULL;
852
    }
853
    return sub_st;
854
}
855

    
856
static int get_stream_idx(int *d){
857
    if(    d[0] >= '0' && d[0] <= '9'
858
        && d[1] >= '0' && d[1] <= '9'){
859
        return (d[0] - '0') * 10 + (d[1] - '0');
860
    }else{
861
        return 100; //invalid stream ID
862
    }
863
}
864

    
865
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
866
{
867
    AVIContext *avi = s->priv_data;
868
    AVIOContext *pb = s->pb;
869
    int n, d[8];
870
    unsigned int size;
871
    int64_t i, sync;
872
    void* dstr;
873

    
874
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
875
        int size = dv_get_packet(avi->dv_demux, pkt);
876
        if (size >= 0)
877
            return size;
878
    }
879

    
880
    if(avi->non_interleaved){
881
        int best_stream_index = 0;
882
        AVStream *best_st= NULL;
883
        AVIStream *best_ast;
884
        int64_t best_ts= INT64_MAX;
885
        int i;
886

    
887
        for(i=0; i<s->nb_streams; i++){
888
            AVStream *st = s->streams[i];
889
            AVIStream *ast = st->priv_data;
890
            int64_t ts= ast->frame_offset;
891
            int64_t last_ts;
892

    
893
            if(!st->nb_index_entries)
894
                continue;
895

    
896
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
897
            if(!ast->remaining && ts > last_ts)
898
                continue;
899

    
900
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
901

    
902
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
903
            if(ts < best_ts){
904
                best_ts= ts;
905
                best_st= st;
906
                best_stream_index= i;
907
            }
908
        }
909
        if(!best_st)
910
            return -1;
911

    
912
        best_ast = best_st->priv_data;
913
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
914
        if(best_ast->remaining)
915
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
916
        else{
917
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
918
            if(i>=0)
919
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
920
        }
921

    
922
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
923
        if(i>=0){
924
            int64_t pos= best_st->index_entries[i].pos;
925
            pos += best_ast->packet_size - best_ast->remaining;
926
            avio_seek(s->pb, pos + 8, SEEK_SET);
927
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
928

    
929
            assert(best_ast->remaining <= best_ast->packet_size);
930

    
931
            avi->stream_index= best_stream_index;
932
            if(!best_ast->remaining)
933
                best_ast->packet_size=
934
                best_ast->remaining= best_st->index_entries[i].size;
935
        }
936
    }
937

    
938
resync:
939
    if(avi->stream_index >= 0){
940
        AVStream *st= s->streams[ avi->stream_index ];
941
        AVIStream *ast= st->priv_data;
942
        int size, err;
943

    
944
        if(get_subtitle_pkt(s, st, pkt))
945
            return 0;
946

    
947
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
948
            size= INT_MAX;
949
        else if(ast->sample_size < 32)
950
            // arbitrary multiplier to avoid tiny packets for raw PCM data
951
            size= 1024*ast->sample_size;
952
        else
953
            size= ast->sample_size;
954

    
955
        if(size > ast->remaining)
956
            size= ast->remaining;
957
        avi->last_pkt_pos= avio_tell(pb);
958
        err= av_get_packet(pb, pkt, size);
959
        if(err<0)
960
            return err;
961

    
962
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
963
            uint8_t *pal;
964
            pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
965
            if(!pal){
966
                av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
967
            }else{
968
                memcpy(pal, ast->pal, AVPALETTE_SIZE);
969
                ast->has_pal = 0;
970
            }
971
        }
972

    
973
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
974
            dstr = pkt->destruct;
975
            size = dv_produce_packet(avi->dv_demux, pkt,
976
                                    pkt->data, pkt->size);
977
            pkt->destruct = dstr;
978
            pkt->flags |= AV_PKT_FLAG_KEY;
979
            if (size < 0)
980
                av_free_packet(pkt);
981
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
982
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
983
            ast->frame_offset++;
984
            avi->stream_index = -1;
985
            ast->remaining = 0;
986
            goto resync;
987
        } else {
988
            /* XXX: How to handle B-frames in AVI? */
989
            pkt->dts = ast->frame_offset;
990
//                pkt->dts += ast->start;
991
            if(ast->sample_size)
992
                pkt->dts /= ast->sample_size;
993
//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);
994
            pkt->stream_index = avi->stream_index;
995

    
996
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
997
                AVIndexEntry *e;
998
                int index;
999
                assert(st->index_entries);
1000

    
1001
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
1002
                e= &st->index_entries[index];
1003

    
1004
                if(index >= 0 && e->timestamp == ast->frame_offset){
1005
                    if (e->flags & AVINDEX_KEYFRAME)
1006
                        pkt->flags |= AV_PKT_FLAG_KEY;
1007
                }
1008
            } else {
1009
                pkt->flags |= AV_PKT_FLAG_KEY;
1010
            }
1011
            ast->frame_offset += get_duration(ast, pkt->size);
1012
        }
1013
        ast->remaining -= size;
1014
        if(!ast->remaining){
1015
            avi->stream_index= -1;
1016
            ast->packet_size= 0;
1017
        }
1018

    
1019
        if(!avi->non_interleaved && ast->seek_pos > pkt->pos){
1020
            av_free_packet(pkt);
1021
            goto resync;
1022
        }
1023
        ast->seek_pos= 0;
1024

    
1025
        return size;
1026
    }
1027

    
1028
    memset(d, -1, sizeof(int)*8);
1029
    for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
1030
        int j;
1031

    
1032
        for(j=0; j<7; j++)
1033
            d[j]= d[j+1];
1034
        d[7]= avio_r8(pb);
1035

    
1036
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1037

    
1038
        n= get_stream_idx(d+2);
1039
//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);
1040
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
1041
            continue;
1042

    
1043
        //parse ix##
1044
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1045
        //parse JUNK
1046
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1047
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1048
            avio_skip(pb, size);
1049
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
1050
            goto resync;
1051
        }
1052

    
1053
        //parse stray LIST
1054
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1055
            avio_skip(pb, 4);
1056
            goto resync;
1057
        }
1058

    
1059
        n= get_stream_idx(d);
1060

    
1061
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1062
            continue;
1063

    
1064
        //detect ##ix chunk and skip
1065
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1066
            avio_skip(pb, size);
1067
            goto resync;
1068
        }
1069

    
1070
        //parse ##dc/##wb
1071
        if(n < s->nb_streams){
1072
            AVStream *st;
1073
            AVIStream *ast;
1074
            st = s->streams[n];
1075
            ast = st->priv_data;
1076

    
1077
            if(s->nb_streams>=2){
1078
                AVStream *st1  = s->streams[1];
1079
                AVIStream *ast1= st1->priv_data;
1080
                //workaround for broken small-file-bug402.avi
1081
                if(   d[2] == 'w' && d[3] == 'b'
1082
                   && n==0
1083
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1084
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1085
                   && ast->prefix == 'd'*256+'c'
1086
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1087
                  ){
1088
                    n=1;
1089
                    st = st1;
1090
                    ast = ast1;
1091
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1092
                }
1093
            }
1094

    
1095

    
1096
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1097
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1098
               || st->discard >= AVDISCARD_ALL){
1099
                ast->frame_offset += get_duration(ast, size);
1100
                avio_skip(pb, size);
1101
                goto resync;
1102
            }
1103

    
1104
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1105
                int k = avio_r8(pb);
1106
                int last = (k + avio_r8(pb) - 1) & 0xFF;
1107

    
1108
                avio_rl16(pb); //flags
1109

    
1110
                for (; k <= last; k++)
1111
                    ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1112
                ast->has_pal= 1;
1113
                goto resync;
1114
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1115
                         d[2]*256+d[3] == ast->prefix /*||
1116
                         (d[2] == 'd' && d[3] == 'c') ||
1117
                         (d[2] == 'w' && d[3] == 'b')*/) {
1118

    
1119
//av_log(s, AV_LOG_DEBUG, "OK\n");
1120
                if(d[2]*256+d[3] == ast->prefix)
1121
                    ast->prefix_count++;
1122
                else{
1123
                    ast->prefix= d[2]*256+d[3];
1124
                    ast->prefix_count= 0;
1125
                }
1126

    
1127
                avi->stream_index= n;
1128
                ast->packet_size= size + 8;
1129
                ast->remaining= size;
1130

    
1131
                if(size || !ast->sample_size){
1132
                    uint64_t pos= avio_tell(pb) - 8;
1133
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1134
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1135
                    }
1136
                }
1137
                goto resync;
1138
            }
1139
        }
1140
    }
1141

    
1142
    return AVERROR_EOF;
1143
}
1144

    
1145
/* XXX: We make the implicit supposition that the positions are sorted
1146
   for each stream. */
1147
static int avi_read_idx1(AVFormatContext *s, int size)
1148
{
1149
    AVIContext *avi = s->priv_data;
1150
    AVIOContext *pb = s->pb;
1151
    int nb_index_entries, i;
1152
    AVStream *st;
1153
    AVIStream *ast;
1154
    unsigned int index, tag, flags, pos, len;
1155
    unsigned last_pos= -1;
1156

    
1157
    nb_index_entries = size / 16;
1158
    if (nb_index_entries <= 0)
1159
        return -1;
1160

    
1161
    /* Read the entries and sort them in each stream component. */
1162
    for(i = 0; i < nb_index_entries; i++) {
1163
        tag = avio_rl32(pb);
1164
        flags = avio_rl32(pb);
1165
        pos = avio_rl32(pb);
1166
        len = avio_rl32(pb);
1167
#if defined(DEBUG_SEEK)
1168
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1169
               i, tag, flags, pos, len);
1170
#endif
1171
        if(i==0 && pos > avi->movi_list)
1172
            avi->movi_list= 0; //FIXME better check
1173
        pos += avi->movi_list;
1174

    
1175
        index = ((tag & 0xff) - '0') * 10;
1176
        index += ((tag >> 8) & 0xff) - '0';
1177
        if (index >= s->nb_streams)
1178
            continue;
1179
        st = s->streams[index];
1180
        ast = st->priv_data;
1181

    
1182
#if defined(DEBUG_SEEK)
1183
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1184
#endif
1185
        if(url_feof(pb))
1186
            return -1;
1187

    
1188
        if(last_pos == pos)
1189
            avi->non_interleaved= 1;
1190
        else if(len || !ast->sample_size)
1191
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1192
        ast->cum_len += get_duration(ast, len);
1193
        last_pos= pos;
1194
    }
1195
    return 0;
1196
}
1197

    
1198
static int guess_ni_flag(AVFormatContext *s){
1199
    int i;
1200
    int64_t last_start=0;
1201
    int64_t first_end= INT64_MAX;
1202
    int64_t oldpos= avio_tell(s->pb);
1203

    
1204
    for(i=0; i<s->nb_streams; i++){
1205
        AVStream *st = s->streams[i];
1206
        int n= st->nb_index_entries;
1207
        unsigned int size;
1208

    
1209
        if(n <= 0)
1210
            continue;
1211

    
1212
        if(n >= 2){
1213
            int64_t pos= st->index_entries[0].pos;
1214
            avio_seek(s->pb, pos + 4, SEEK_SET);
1215
            size= avio_rl32(s->pb);
1216
            if(pos + size > st->index_entries[1].pos)
1217
                last_start= INT64_MAX;
1218
        }
1219

    
1220
        if(st->index_entries[0].pos > last_start)
1221
            last_start= st->index_entries[0].pos;
1222
        if(st->index_entries[n-1].pos < first_end)
1223
            first_end= st->index_entries[n-1].pos;
1224
    }
1225
    avio_seek(s->pb, oldpos, SEEK_SET);
1226
    return last_start > first_end;
1227
}
1228

    
1229
static int avi_load_index(AVFormatContext *s)
1230
{
1231
    AVIContext *avi = s->priv_data;
1232
    AVIOContext *pb = s->pb;
1233
    uint32_t tag, size;
1234
    int64_t pos= avio_tell(pb);
1235
    int ret = -1;
1236

    
1237
    if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1238
        goto the_end; // maybe truncated file
1239
#ifdef DEBUG_SEEK
1240
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1241
#endif
1242
    for(;;) {
1243
        if (url_feof(pb))
1244
            break;
1245
        tag = avio_rl32(pb);
1246
        size = avio_rl32(pb);
1247
#ifdef DEBUG_SEEK
1248
        printf("tag=%c%c%c%c size=0x%x\n",
1249
               tag & 0xff,
1250
               (tag >> 8) & 0xff,
1251
               (tag >> 16) & 0xff,
1252
               (tag >> 24) & 0xff,
1253
               size);
1254
#endif
1255
        switch(tag) {
1256
        case MKTAG('i', 'd', 'x', '1'):
1257
            if (avi_read_idx1(s, size) < 0)
1258
                goto skip;
1259
            ret = 0;
1260
                goto the_end;
1261
            break;
1262
        default:
1263
        skip:
1264
            size += (size & 1);
1265
            if (avio_skip(pb, size) < 0)
1266
                goto the_end; // something is wrong here
1267
            break;
1268
        }
1269
    }
1270
 the_end:
1271
    avio_seek(pb, pos, SEEK_SET);
1272
    return ret;
1273
}
1274

    
1275
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1276
{
1277
    AVIStream *ast2 = st2->priv_data;
1278
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1279
    av_free_packet(&ast2->sub_pkt);
1280
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1281
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1282
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1283
}
1284

    
1285
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1286
{
1287
    AVIContext *avi = s->priv_data;
1288
    AVStream *st;
1289
    int i, index;
1290
    int64_t pos, pos_min;
1291
    AVIStream *ast;
1292

    
1293
    if (!avi->index_loaded) {
1294
        /* we only load the index on demand */
1295
        avi_load_index(s);
1296
        avi->index_loaded = 1;
1297
    }
1298
    assert(stream_index>= 0);
1299

    
1300
    st = s->streams[stream_index];
1301
    ast= st->priv_data;
1302
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1303
    if(index<0)
1304
        return -1;
1305

    
1306
    /* find the position */
1307
    pos = st->index_entries[index].pos;
1308
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1309

    
1310
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1311

    
1312
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1313
        /* One and only one real stream for DV in AVI, and it has video  */
1314
        /* offsets. Calling with other stream indexes should have failed */
1315
        /* the av_index_search_timestamp call above.                     */
1316
        assert(stream_index == 0);
1317

    
1318
        /* Feed the DV video stream version of the timestamp to the */
1319
        /* DV demux so it can synthesize correct timestamps.        */
1320
        dv_offset_reset(avi->dv_demux, timestamp);
1321

    
1322
        avio_seek(s->pb, pos, SEEK_SET);
1323
        avi->stream_index= -1;
1324
        return 0;
1325
    }
1326

    
1327
    pos_min= pos;
1328
    for(i = 0; i < s->nb_streams; i++) {
1329
        AVStream *st2 = s->streams[i];
1330
        AVIStream *ast2 = st2->priv_data;
1331

    
1332
        ast2->packet_size=
1333
        ast2->remaining= 0;
1334

    
1335
        if (ast2->sub_ctx) {
1336
            seek_subtitle(st, st2, timestamp);
1337
            continue;
1338
        }
1339

    
1340
        if (st2->nb_index_entries <= 0)
1341
            continue;
1342

    
1343
//        assert(st2->codec->block_align);
1344
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1345
        index = av_index_search_timestamp(
1346
                st2,
1347
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1348
                flags | AVSEEK_FLAG_BACKWARD);
1349
        if(index<0)
1350
            index=0;
1351
        ast2->seek_pos= st2->index_entries[index].pos;
1352
        pos_min= FFMIN(pos_min,ast2->seek_pos);
1353
        ast2->frame_offset = st2->index_entries[index].timestamp;
1354
    }
1355

    
1356
    /* do the seek */
1357
    avio_seek(s->pb, pos_min, SEEK_SET);
1358
    avi->stream_index= -1;
1359
    return 0;
1360
}
1361

    
1362
static int avi_read_close(AVFormatContext *s)
1363
{
1364
    int i;
1365
    AVIContext *avi = s->priv_data;
1366

    
1367
    for(i=0;i<s->nb_streams;i++) {
1368
        AVStream *st = s->streams[i];
1369
        AVIStream *ast = st->priv_data;
1370
        if (ast) {
1371
            if (ast->sub_ctx) {
1372
                av_freep(&ast->sub_ctx->pb);
1373
                av_close_input_stream(ast->sub_ctx);
1374
            }
1375
            av_free(ast->sub_buffer);
1376
            av_free_packet(&ast->sub_pkt);
1377
        }
1378
    }
1379

    
1380
    av_free(avi->dv_demux);
1381

    
1382
    return 0;
1383
}
1384

    
1385
static int avi_probe(AVProbeData *p)
1386
{
1387
    int i;
1388

    
1389
    /* check file header */
1390
    for(i=0; avi_headers[i][0]; i++)
1391
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1392
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1393
            return AVPROBE_SCORE_MAX;
1394

    
1395
    return 0;
1396
}
1397

    
1398
AVInputFormat ff_avi_demuxer = {
1399
    "avi",
1400
    NULL_IF_CONFIG_SMALL("AVI format"),
1401
    sizeof(AVIContext),
1402
    avi_probe,
1403
    avi_read_header,
1404
    avi_read_packet,
1405
    avi_read_close,
1406
    avi_read_seek,
1407
    .priv_class = &demuxer_class,
1408
};