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ffmpeg / libavformat / avidec.c @ 2d2b5a14

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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 "avformat.h"
29
#include "avi.h"
30
#include "dv.h"
31
#include "riff.h"
32

    
33
#undef NDEBUG
34
#include <assert.h>
35

    
36
typedef struct AVIStream {
37
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
38
                         (used to compute the pts) */
39
    int remaining;
40
    int packet_size;
41

    
42
    int scale;
43
    int rate;
44
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45

    
46
    int64_t cum_len; /* temporary storage (used during seek) */
47

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

    
54
    AVFormatContext *sub_ctx;
55
    AVPacket sub_pkt;
56
    uint8_t *sub_buffer;
57
} AVIStream;
58

    
59
typedef struct {
60
    int64_t  riff_end;
61
    int64_t  movi_end;
62
    int64_t  fsize;
63
    int64_t movi_list;
64
    int64_t last_pkt_pos;
65
    int index_loaded;
66
    int is_odml;
67
    int non_interleaved;
68
    int stream_index;
69
    DVDemuxContext* dv_demux;
70
    int odml_depth;
71
#define MAX_ODML_DEPTH 1000
72
} AVIContext;
73

    
74
static const char avi_headers[][8] = {
75
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
76
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
77
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
78
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
79
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
80
    { 0 }
81
};
82

    
83
static int avi_load_index(AVFormatContext *s);
84
static int guess_ni_flag(AVFormatContext *s);
85

    
86
#define print_tag(str, tag, size)                       \
87
    av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
88
           str, tag & 0xff,                             \
89
           (tag >> 8) & 0xff,                           \
90
           (tag >> 16) & 0xff,                          \
91
           (tag >> 24) & 0xff,                          \
92
           size)
93

    
94
static inline int get_duration(AVIStream *ast, int len){
95
    if(ast->sample_size){
96
        return len;
97
    }else if (ast->dshow_block_align){
98
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
99
    }else
100
        return 1;
101
}
102

    
103
static int get_riff(AVFormatContext *s, AVIOContext *pb)
104
{
105
    AVIContext *avi = s->priv_data;
106
    char header[8];
107
    int i;
108

    
109
    /* check RIFF header */
110
    avio_read(pb, header, 4);
111
    avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */
112
    avi->riff_end += avio_tell(pb); /* RIFF chunk end */
113
    avio_read(pb, header+4, 4);
114

    
115
    for(i=0; avi_headers[i][0]; i++)
116
        if(!memcmp(header, avi_headers[i], 8))
117
            break;
118
    if(!avi_headers[i][0])
119
        return -1;
120

    
121
    if(header[7] == 0x19)
122
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
123

    
124
    return 0;
125
}
126

    
127
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
128
    AVIContext *avi = s->priv_data;
129
    AVIOContext *pb = s->pb;
130
    int longs_pre_entry= avio_rl16(pb);
131
    int index_sub_type = avio_r8(pb);
132
    int index_type     = avio_r8(pb);
133
    int entries_in_use = avio_rl32(pb);
134
    int chunk_id       = avio_rl32(pb);
135
    int64_t base       = avio_rl64(pb);
136
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
137
    AVStream *st;
138
    AVIStream *ast;
139
    int i;
140
    int64_t last_pos= -1;
141
    int64_t filesize= avio_size(s->pb);
142

    
143
#ifdef DEBUG_SEEK
144
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
145
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
146
#endif
147

    
148
    if(stream_id >= s->nb_streams || stream_id < 0)
149
        return -1;
150
    st= s->streams[stream_id];
151
    ast = st->priv_data;
152

    
153
    if(index_sub_type)
154
        return -1;
155

    
156
    avio_rl32(pb);
157

    
158
    if(index_type && longs_pre_entry != 2)
159
        return -1;
160
    if(index_type>1)
161
        return -1;
162

    
163
    if(filesize > 0 && base >= filesize){
164
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
165
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
166
            base &= 0xFFFFFFFF;
167
        else
168
            return -1;
169
    }
170

    
171
    for(i=0; i<entries_in_use; i++){
172
        if(index_type){
173
            int64_t pos= avio_rl32(pb) + base - 8;
174
            int len    = avio_rl32(pb);
175
            int key= len >= 0;
176
            len &= 0x7FFFFFFF;
177

    
178
#ifdef DEBUG_SEEK
179
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
180
#endif
181
            if(url_feof(pb))
182
                return -1;
183

    
184
            if(last_pos == pos || pos == base - 8)
185
                avi->non_interleaved= 1;
186
            if(last_pos != pos && (len || !ast->sample_size))
187
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
188

    
189
            ast->cum_len += get_duration(ast, len);
190
            last_pos= pos;
191
        }else{
192
            int64_t offset, pos;
193
            int duration;
194
            offset = avio_rl64(pb);
195
            avio_rl32(pb);       /* size */
196
            duration = avio_rl32(pb);
197

    
198
            if(url_feof(pb))
199
                return -1;
200

    
201
            pos = avio_tell(pb);
202

    
203
            if(avi->odml_depth > MAX_ODML_DEPTH){
204
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
205
                return -1;
206
            }
207

    
208
            avio_seek(pb, offset+8, SEEK_SET);
209
            avi->odml_depth++;
210
            read_braindead_odml_indx(s, frame_num);
211
            avi->odml_depth--;
212
            frame_num += duration;
213

    
214
            avio_seek(pb, pos, SEEK_SET);
215
        }
216
    }
217
    avi->index_loaded=1;
218
    return 0;
219
}
220

    
221
static void clean_index(AVFormatContext *s){
222
    int i;
223
    int64_t j;
224

    
225
    for(i=0; i<s->nb_streams; i++){
226
        AVStream *st = s->streams[i];
227
        AVIStream *ast = st->priv_data;
228
        int n= st->nb_index_entries;
229
        int max= ast->sample_size;
230
        int64_t pos, size, ts;
231

    
232
        if(n != 1 || ast->sample_size==0)
233
            continue;
234

    
235
        while(max < 1024) max+=max;
236

    
237
        pos= st->index_entries[0].pos;
238
        size= st->index_entries[0].size;
239
        ts= st->index_entries[0].timestamp;
240

    
241
        for(j=0; j<size; j+=max){
242
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
243
        }
244
    }
245
}
246

    
247
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
248
{
249
    AVIOContext *pb = s->pb;
250
    char key[5] = {0}, *value;
251

    
252
    size += (size & 1);
253

    
254
    if (size == UINT_MAX)
255
        return -1;
256
    value = av_malloc(size+1);
257
    if (!value)
258
        return -1;
259
    avio_read(pb, value, size);
260
    value[size]=0;
261

    
262
    AV_WL32(key, tag);
263

    
264
    return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
265
                            AV_METADATA_DONT_STRDUP_VAL);
266
}
267

    
268
static void avi_read_info(AVFormatContext *s, uint64_t end)
269
{
270
    while (avio_tell(s->pb) < end) {
271
        uint32_t tag  = avio_rl32(s->pb);
272
        uint32_t size = avio_rl32(s->pb);
273
        avi_read_tag(s, NULL, tag, size);
274
    }
275
}
276

    
277
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
278
                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
279

    
280
static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
281
{
282
    char month[4], time[9], buffer[64];
283
    int i, day, year;
284
    /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
285
    if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
286
               month, &day, time, &year) == 4) {
287
        for (i=0; i<12; i++)
288
            if (!strcasecmp(month, months[i])) {
289
                snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
290
                         year, i+1, day, time);
291
                av_metadata_set2(metadata, "creation_time", buffer, 0);
292
            }
293
    } else if (date[4] == '/' && date[7] == '/') {
294
        date[4] = date[7] = '-';
295
        av_metadata_set2(metadata, "creation_time", date, 0);
296
    }
297
}
298

    
299
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
300
{
301
    while (avio_tell(s->pb) < end) {
302
        uint32_t tag  = avio_rl32(s->pb);
303
        uint32_t size = avio_rl32(s->pb);
304
        switch (tag) {
305
        case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
306
            uint64_t tag_end = avio_tell(s->pb) + size;
307
            while (avio_tell(s->pb) < tag_end) {
308
                uint16_t tag  = avio_rl16(s->pb);
309
                uint16_t size = avio_rl16(s->pb);
310
                const char *name = NULL;
311
                char buffer[64] = {0};
312
                size -= avio_read(s->pb, buffer,
313
                                   FFMIN(size, sizeof(buffer)-1));
314
                switch (tag) {
315
                case 0x03:  name = "maker";  break;
316
                case 0x04:  name = "model";  break;
317
                case 0x13:  name = "creation_time";
318
                    if (buffer[4] == ':' && buffer[7] == ':')
319
                        buffer[4] = buffer[7] = '-';
320
                    break;
321
                }
322
                if (name)
323
                    av_metadata_set2(&s->metadata, name, buffer, 0);
324
                avio_skip(s->pb, size);
325
            }
326
            break;
327
        }
328
        default:
329
            avio_skip(s->pb, size);
330
            break;
331
        }
332
    }
333
}
334

    
335
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
336
{
337
    AVIContext *avi = s->priv_data;
338
    AVIOContext *pb = s->pb;
339
    unsigned int tag, tag1, handler;
340
    int codec_type, stream_index, frame_period, bit_rate;
341
    unsigned int size;
342
    int i;
343
    AVStream *st;
344
    AVIStream *ast = NULL;
345
    int avih_width=0, avih_height=0;
346
    int amv_file_format=0;
347
    uint64_t list_end = 0;
348
    int ret;
349

    
350
    avi->stream_index= -1;
351

    
352
    if (get_riff(s, pb) < 0)
353
        return -1;
354

    
355
    avi->fsize = avio_size(pb);
356
    if(avi->fsize<=0)
357
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
358

    
359
    /* first list tag */
360
    stream_index = -1;
361
    codec_type = -1;
362
    frame_period = 0;
363
    for(;;) {
364
        if (url_feof(pb))
365
            goto fail;
366
        tag = avio_rl32(pb);
367
        size = avio_rl32(pb);
368

    
369
        print_tag("tag", tag, size);
370

    
371
        switch(tag) {
372
        case MKTAG('L', 'I', 'S', 'T'):
373
            list_end = avio_tell(pb) + size;
374
            /* Ignored, except at start of video packets. */
375
            tag1 = avio_rl32(pb);
376

    
377
            print_tag("list", tag1, 0);
378

    
379
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
380
                avi->movi_list = avio_tell(pb) - 4;
381
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
382
                else     avi->movi_end = avio_size(pb);
383
                av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
384
                goto end_of_header;
385
            }
386
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
387
                avi_read_info(s, list_end);
388
            else if (tag1 == MKTAG('n', 'c', 'd', 't'))
389
                avi_read_nikon(s, list_end);
390

    
391
            break;
392
        case MKTAG('I', 'D', 'I', 'T'): {
393
            unsigned char date[64] = {0};
394
            size += (size & 1);
395
            size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
396
            avio_skip(pb, size);
397
            avi_metadata_creation_time(&s->metadata, date);
398
            break;
399
        }
400
        case MKTAG('d', 'm', 'l', 'h'):
401
            avi->is_odml = 1;
402
            avio_skip(pb, size + (size & 1));
403
            break;
404
        case MKTAG('a', 'm', 'v', 'h'):
405
            amv_file_format=1;
406
        case MKTAG('a', 'v', 'i', 'h'):
407
            /* AVI header */
408
            /* using frame_period is bad idea */
409
            frame_period = avio_rl32(pb);
410
            bit_rate = avio_rl32(pb) * 8;
411
            avio_rl32(pb);
412
            avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
413

    
414
            avio_skip(pb, 2 * 4);
415
            avio_rl32(pb);
416
            avio_rl32(pb);
417
            avih_width=avio_rl32(pb);
418
            avih_height=avio_rl32(pb);
419

    
420
            avio_skip(pb, size - 10 * 4);
421
            break;
422
        case MKTAG('s', 't', 'r', 'h'):
423
            /* stream header */
424

    
425
            tag1 = avio_rl32(pb);
426
            handler = avio_rl32(pb); /* codec tag */
427

    
428
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
429
                avio_skip(pb, size - 8);
430
                break;
431
            }else{
432
                stream_index++;
433
                st = av_new_stream(s, stream_index);
434
                if (!st)
435
                    goto fail;
436

    
437
                ast = av_mallocz(sizeof(AVIStream));
438
                if (!ast)
439
                    goto fail;
440
                st->priv_data = ast;
441
            }
442
            if(amv_file_format)
443
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
444

    
445
            print_tag("strh", tag1, -1);
446

    
447
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
448
                int64_t dv_dur;
449

    
450
                /*
451
                 * After some consideration -- I don't think we
452
                 * have to support anything but DV in type1 AVIs.
453
                 */
454
                if (s->nb_streams != 1)
455
                    goto fail;
456

    
457
                if (handler != MKTAG('d', 'v', 's', 'd') &&
458
                    handler != MKTAG('d', 'v', 'h', 'd') &&
459
                    handler != MKTAG('d', 'v', 's', 'l'))
460
                   goto fail;
461

    
462
                ast = s->streams[0]->priv_data;
463
                av_freep(&s->streams[0]->codec->extradata);
464
                av_freep(&s->streams[0]->codec);
465
                av_freep(&s->streams[0]);
466
                s->nb_streams = 0;
467
                if (CONFIG_DV_DEMUXER) {
468
                    avi->dv_demux = dv_init_demux(s);
469
                    if (!avi->dv_demux)
470
                        goto fail;
471
                }
472
                s->streams[0]->priv_data = ast;
473
                avio_skip(pb, 3 * 4);
474
                ast->scale = avio_rl32(pb);
475
                ast->rate = avio_rl32(pb);
476
                avio_skip(pb, 4);  /* start time */
477

    
478
                dv_dur = avio_rl32(pb);
479
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
480
                    dv_dur *= AV_TIME_BASE;
481
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
482
                }
483
                /*
484
                 * else, leave duration alone; timing estimation in utils.c
485
                 *      will make a guess based on bitrate.
486
                 */
487

    
488
                stream_index = s->nb_streams - 1;
489
                avio_skip(pb, size - 9*4);
490
                break;
491
            }
492

    
493
            assert(stream_index < s->nb_streams);
494
            st->codec->stream_codec_tag= handler;
495

    
496
            avio_rl32(pb); /* flags */
497
            avio_rl16(pb); /* priority */
498
            avio_rl16(pb); /* language */
499
            avio_rl32(pb); /* initial frame */
500
            ast->scale = avio_rl32(pb);
501
            ast->rate = avio_rl32(pb);
502
            if(!(ast->scale && ast->rate)){
503
                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);
504
                if(frame_period){
505
                    ast->rate = 1000000;
506
                    ast->scale = frame_period;
507
                }else{
508
                    ast->rate = 25;
509
                    ast->scale = 1;
510
                }
511
            }
512
            av_set_pts_info(st, 64, ast->scale, ast->rate);
513

    
514
            ast->cum_len=avio_rl32(pb); /* start */
515
            st->nb_frames = avio_rl32(pb);
516

    
517
            st->start_time = 0;
518
            avio_rl32(pb); /* buffer size */
519
            avio_rl32(pb); /* quality */
520
            ast->sample_size = avio_rl32(pb); /* sample ssize */
521
            ast->cum_len *= FFMAX(1, ast->sample_size);
522
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
523

    
524
            switch(tag1) {
525
            case MKTAG('v', 'i', 'd', 's'):
526
                codec_type = AVMEDIA_TYPE_VIDEO;
527

    
528
                ast->sample_size = 0;
529
                break;
530
            case MKTAG('a', 'u', 'd', 's'):
531
                codec_type = AVMEDIA_TYPE_AUDIO;
532
                break;
533
            case MKTAG('t', 'x', 't', 's'):
534
                codec_type = AVMEDIA_TYPE_SUBTITLE;
535
                break;
536
            case MKTAG('d', 'a', 't', 's'):
537
                codec_type = AVMEDIA_TYPE_DATA;
538
                break;
539
            default:
540
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
541
                goto fail;
542
            }
543
            if(ast->sample_size == 0)
544
                st->duration = st->nb_frames;
545
            ast->frame_offset= ast->cum_len;
546
            avio_skip(pb, size - 12 * 4);
547
            break;
548
        case MKTAG('s', 't', 'r', 'f'):
549
            /* stream header */
550
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
551
                avio_skip(pb, size);
552
            } else {
553
                uint64_t cur_pos = avio_tell(pb);
554
                if (cur_pos < list_end)
555
                    size = FFMIN(size, list_end - cur_pos);
556
                st = s->streams[stream_index];
557
                switch(codec_type) {
558
                case AVMEDIA_TYPE_VIDEO:
559
                    if(amv_file_format){
560
                        st->codec->width=avih_width;
561
                        st->codec->height=avih_height;
562
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
563
                        st->codec->codec_id = CODEC_ID_AMV;
564
                        avio_skip(pb, size);
565
                        break;
566
                    }
567
                    tag1 = ff_get_bmp_header(pb, st);
568

    
569
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
570
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
571
                        st->codec->codec_tag = tag1;
572
                        st->codec->codec_id = CODEC_ID_XSUB;
573
                        break;
574
                    }
575

    
576
                    if(size > 10*4 && size<(1<<30)){
577
                        st->codec->extradata_size= size - 10*4;
578
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
579
                        if (!st->codec->extradata) {
580
                            st->codec->extradata_size= 0;
581
                            return AVERROR(ENOMEM);
582
                        }
583
                        avio_read(pb, st->codec->extradata, st->codec->extradata_size);
584
                    }
585

    
586
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
587
                        avio_r8(pb);
588

    
589
                    /* Extract palette from extradata if bpp <= 8. */
590
                    /* This code assumes that extradata contains only palette. */
591
                    /* This is true for all paletted codecs implemented in FFmpeg. */
592
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
593
#if HAVE_BIGENDIAN
594
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
595
                            ast->pal[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
596
#else
597
                        memcpy(ast->pal, st->codec->extradata,
598
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
599
#endif
600
                        ast->has_pal = 1;
601
                    }
602

    
603
                    print_tag("video", tag1, 0);
604

    
605
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
606
                    st->codec->codec_tag = tag1;
607
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
608
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
609
                    // Support "Resolution 1:1" for Avid AVI Codec
610
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
611
                       st->codec->extradata_size >= 31 &&
612
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
613
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
614

    
615
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
616
                        st->codec->extradata_size+= 9;
617
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
618
                        if(st->codec->extradata)
619
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
620
                    }
621
                    st->codec->height= FFABS(st->codec->height);
622

    
623
//                    avio_skip(pb, size - 5 * 4);
624
                    break;
625
                case AVMEDIA_TYPE_AUDIO:
626
                    ret = ff_get_wav_header(pb, st->codec, size);
627
                    if (ret < 0)
628
                        return ret;
629
                    ast->dshow_block_align= st->codec->block_align;
630
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
631
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
632
                        ast->sample_size= st->codec->block_align;
633
                    }
634
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
635
                        avio_skip(pb, 1);
636
                    /* Force parsing as several audio frames can be in
637
                     * one packet and timestamps refer to packet start. */
638
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
639
                    /* ADTS header is in extradata, AAC without header must be
640
                     * stored as exact frames. Parser not needed and it will
641
                     * fail. */
642
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
643
                        st->need_parsing = AVSTREAM_PARSE_NONE;
644
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
645
                     * audio in the header but have Axan as stream_code_tag. */
646
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
647
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
648
                        st->codec->codec_tag = 0;
649
                    }
650
                    if (amv_file_format){
651
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
652
                        ast->dshow_block_align = 0;
653
                    }
654
                    break;
655
                case AVMEDIA_TYPE_SUBTITLE:
656
                    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
657
                    st->request_probe= 1;
658
                    break;
659
                default:
660
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
661
                    st->codec->codec_id= CODEC_ID_NONE;
662
                    st->codec->codec_tag= 0;
663
                    avio_skip(pb, size);
664
                    break;
665
                }
666
            }
667
            break;
668
        case MKTAG('i', 'n', 'd', 'x'):
669
            i= avio_tell(pb);
670
            if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX)){
671
                read_braindead_odml_indx(s, 0);
672
            }
673
            avio_seek(pb, i+size, SEEK_SET);
674
            break;
675
        case MKTAG('v', 'p', 'r', 'p'):
676
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
677
                AVRational active, active_aspect;
678

    
679
                st = s->streams[stream_index];
680
                avio_rl32(pb);
681
                avio_rl32(pb);
682
                avio_rl32(pb);
683
                avio_rl32(pb);
684
                avio_rl32(pb);
685

    
686
                active_aspect.den= avio_rl16(pb);
687
                active_aspect.num= avio_rl16(pb);
688
                active.num       = avio_rl32(pb);
689
                active.den       = avio_rl32(pb);
690
                avio_rl32(pb); //nbFieldsPerFrame
691

    
692
                if(active_aspect.num && active_aspect.den && active.num && active.den){
693
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
694
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
695
                }
696
                size -= 9*4;
697
            }
698
            avio_skip(pb, size);
699
            break;
700
        case MKTAG('s', 't', 'r', 'n'):
701
            if(s->nb_streams){
702
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
703
                break;
704
            }
705
        default:
706
            if(size > 1000000){
707
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
708
                                        "I will ignore it and try to continue anyway.\n");
709
                avi->movi_list = avio_tell(pb) - 4;
710
                avi->movi_end  = avio_size(pb);
711
                goto end_of_header;
712
            }
713
            /* skip tag */
714
            size += (size & 1);
715
            avio_skip(pb, size);
716
            break;
717
        }
718
    }
719
 end_of_header:
720
    /* check stream number */
721
    if (stream_index != s->nb_streams - 1) {
722
    fail:
723
        return -1;
724
    }
725

    
726
    if(!avi->index_loaded && pb->seekable)
727
        avi_load_index(s);
728
    avi->index_loaded = 1;
729
    avi->non_interleaved |= guess_ni_flag(s);
730
    for(i=0; i<s->nb_streams; i++){
731
        AVStream *st = s->streams[i];
732
        if(st->nb_index_entries)
733
            break;
734
    }
735
    if(i==s->nb_streams && avi->non_interleaved) {
736
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
737
        avi->non_interleaved=0;
738
    }
739

    
740
    if(avi->non_interleaved) {
741
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
742
        clean_index(s);
743
    }
744

    
745
    ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
746

    
747
    return 0;
748
}
749

    
750
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
751
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
752
        uint8_t desc[256];
753
        int score = AVPROBE_SCORE_MAX / 2, ret;
754
        AVIStream *ast = st->priv_data;
755
        AVInputFormat *sub_demuxer;
756
        AVRational time_base;
757
        AVIOContext *pb = avio_alloc_context( pkt->data + 7,
758
                                              pkt->size - 7,
759
                                              0, NULL, NULL, NULL, NULL);
760
        AVProbeData pd;
761
        unsigned int desc_len = avio_rl32(pb);
762

    
763
        if (desc_len > pb->buf_end - pb->buf_ptr)
764
            goto error;
765

    
766
        ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
767
        avio_skip(pb, desc_len - ret);
768
        if (*desc)
769
            av_metadata_set2(&st->metadata, "title", desc, 0);
770

    
771
        avio_rl16(pb);   /* flags? */
772
        avio_rl32(pb);   /* data size */
773

    
774
        pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
775
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
776
            goto error;
777

    
778
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
779
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
780
            *st->codec = *ast->sub_ctx->streams[0]->codec;
781
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
782
            time_base = ast->sub_ctx->streams[0]->time_base;
783
            av_set_pts_info(st, 64, time_base.num, time_base.den);
784
        }
785
        ast->sub_buffer = pkt->data;
786
        memset(pkt, 0, sizeof(*pkt));
787
        return 1;
788
error:
789
        av_freep(&pb);
790
    }
791
    return 0;
792
}
793

    
794
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
795
                                  AVPacket *pkt)
796
{
797
    AVIStream *ast, *next_ast = next_st->priv_data;
798
    int64_t ts, next_ts, ts_min = INT64_MAX;
799
    AVStream *st, *sub_st = NULL;
800
    int i;
801

    
802
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
803
                           AV_TIME_BASE_Q);
804

    
805
    for (i=0; i<s->nb_streams; i++) {
806
        st  = s->streams[i];
807
        ast = st->priv_data;
808
        if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
809
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
810
            if (ts <= next_ts && ts < ts_min) {
811
                ts_min = ts;
812
                sub_st = st;
813
            }
814
        }
815
    }
816

    
817
    if (sub_st) {
818
        ast = sub_st->priv_data;
819
        *pkt = ast->sub_pkt;
820
        pkt->stream_index = sub_st->index;
821
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
822
            ast->sub_pkt.data = NULL;
823
    }
824
    return sub_st;
825
}
826

    
827
static int get_stream_idx(int *d){
828
    if(    d[0] >= '0' && d[0] <= '9'
829
        && d[1] >= '0' && d[1] <= '9'){
830
        return (d[0] - '0') * 10 + (d[1] - '0');
831
    }else{
832
        return 100; //invalid stream ID
833
    }
834
}
835

    
836
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
837
{
838
    AVIContext *avi = s->priv_data;
839
    AVIOContext *pb = s->pb;
840
    int n, d[8];
841
    unsigned int size;
842
    int64_t i, sync;
843
    void* dstr;
844

    
845
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
846
        int size = dv_get_packet(avi->dv_demux, pkt);
847
        if (size >= 0)
848
            return size;
849
    }
850

    
851
    if(avi->non_interleaved){
852
        int best_stream_index = 0;
853
        AVStream *best_st= NULL;
854
        AVIStream *best_ast;
855
        int64_t best_ts= INT64_MAX;
856
        int i;
857

    
858
        for(i=0; i<s->nb_streams; i++){
859
            AVStream *st = s->streams[i];
860
            AVIStream *ast = st->priv_data;
861
            int64_t ts= ast->frame_offset;
862
            int64_t last_ts;
863

    
864
            if(!st->nb_index_entries)
865
                continue;
866

    
867
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
868
            if(!ast->remaining && ts > last_ts)
869
                continue;
870

    
871
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
872

    
873
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
874
            if(ts < best_ts){
875
                best_ts= ts;
876
                best_st= st;
877
                best_stream_index= i;
878
            }
879
        }
880
        if(!best_st)
881
            return -1;
882

    
883
        best_ast = best_st->priv_data;
884
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
885
        if(best_ast->remaining)
886
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
887
        else{
888
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
889
            if(i>=0)
890
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
891
        }
892

    
893
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
894
        if(i>=0){
895
            int64_t pos= best_st->index_entries[i].pos;
896
            pos += best_ast->packet_size - best_ast->remaining;
897
            avio_seek(s->pb, pos + 8, SEEK_SET);
898
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
899

    
900
            assert(best_ast->remaining <= best_ast->packet_size);
901

    
902
            avi->stream_index= best_stream_index;
903
            if(!best_ast->remaining)
904
                best_ast->packet_size=
905
                best_ast->remaining= best_st->index_entries[i].size;
906
        }
907
    }
908

    
909
resync:
910
    if(avi->stream_index >= 0){
911
        AVStream *st= s->streams[ avi->stream_index ];
912
        AVIStream *ast= st->priv_data;
913
        int size, err;
914

    
915
        if(get_subtitle_pkt(s, st, pkt))
916
            return 0;
917

    
918
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
919
            size= INT_MAX;
920
        else if(ast->sample_size < 32)
921
            // arbitrary multiplier to avoid tiny packets for raw PCM data
922
            size= 1024*ast->sample_size;
923
        else
924
            size= ast->sample_size;
925

    
926
        if(size > ast->remaining)
927
            size= ast->remaining;
928
        avi->last_pkt_pos= avio_tell(pb);
929
        err= av_get_packet(pb, pkt, size);
930
        if(err<0)
931
            return err;
932

    
933
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
934
            uint8_t *pal;
935
            pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
936
            if(!pal){
937
                av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
938
            }else{
939
                memcpy(pal, ast->pal, AVPALETTE_SIZE);
940
                ast->has_pal = 0;
941
            }
942
        }
943

    
944
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
945
            dstr = pkt->destruct;
946
            size = dv_produce_packet(avi->dv_demux, pkt,
947
                                    pkt->data, pkt->size);
948
            pkt->destruct = dstr;
949
            pkt->flags |= AV_PKT_FLAG_KEY;
950
            if (size < 0)
951
                av_free_packet(pkt);
952
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
953
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
954
            ast->frame_offset++;
955
            avi->stream_index = -1;
956
            ast->remaining = 0;
957
            goto resync;
958
        } else {
959
            /* XXX: How to handle B-frames in AVI? */
960
            pkt->dts = ast->frame_offset;
961
//                pkt->dts += ast->start;
962
            if(ast->sample_size)
963
                pkt->dts /= ast->sample_size;
964
//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);
965
            pkt->stream_index = avi->stream_index;
966

    
967
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
968
                AVIndexEntry *e;
969
                int index;
970
                assert(st->index_entries);
971

    
972
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
973
                e= &st->index_entries[index];
974

    
975
                if(index >= 0 && e->timestamp == ast->frame_offset){
976
                    if (e->flags & AVINDEX_KEYFRAME)
977
                        pkt->flags |= AV_PKT_FLAG_KEY;
978
                }
979
            } else {
980
                pkt->flags |= AV_PKT_FLAG_KEY;
981
            }
982
            ast->frame_offset += get_duration(ast, pkt->size);
983
        }
984
        ast->remaining -= size;
985
        if(!ast->remaining){
986
            avi->stream_index= -1;
987
            ast->packet_size= 0;
988
        }
989

    
990
        return size;
991
    }
992

    
993
    memset(d, -1, sizeof(int)*8);
994
    for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
995
        int j;
996

    
997
        for(j=0; j<7; j++)
998
            d[j]= d[j+1];
999
        d[7]= avio_r8(pb);
1000

    
1001
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1002

    
1003
        n= get_stream_idx(d+2);
1004
//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);
1005
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
1006
            continue;
1007

    
1008
        //parse ix##
1009
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1010
        //parse JUNK
1011
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1012
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1013
            avio_skip(pb, size);
1014
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
1015
            goto resync;
1016
        }
1017

    
1018
        //parse stray LIST
1019
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1020
            avio_skip(pb, 4);
1021
            goto resync;
1022
        }
1023

    
1024
        n= get_stream_idx(d);
1025

    
1026
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1027
            continue;
1028

    
1029
        //detect ##ix chunk and skip
1030
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1031
            avio_skip(pb, size);
1032
            goto resync;
1033
        }
1034

    
1035
        //parse ##dc/##wb
1036
        if(n < s->nb_streams){
1037
            AVStream *st;
1038
            AVIStream *ast;
1039
            st = s->streams[n];
1040
            ast = st->priv_data;
1041

    
1042
            if(s->nb_streams>=2){
1043
                AVStream *st1  = s->streams[1];
1044
                AVIStream *ast1= st1->priv_data;
1045
                //workaround for broken small-file-bug402.avi
1046
                if(   d[2] == 'w' && d[3] == 'b'
1047
                   && n==0
1048
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1049
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1050
                   && ast->prefix == 'd'*256+'c'
1051
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1052
                  ){
1053
                    n=1;
1054
                    st = st1;
1055
                    ast = ast1;
1056
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1057
                }
1058
            }
1059

    
1060

    
1061
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1062
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1063
               || st->discard >= AVDISCARD_ALL){
1064
                ast->frame_offset += get_duration(ast, size);
1065
                avio_skip(pb, size);
1066
                goto resync;
1067
            }
1068

    
1069
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1070
                int k = avio_r8(pb);
1071
                int last = (k + avio_r8(pb) - 1) & 0xFF;
1072

    
1073
                avio_rl16(pb); //flags
1074

    
1075
                for (; k <= last; k++)
1076
                    ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1077
                ast->has_pal= 1;
1078
                goto resync;
1079
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1080
                         d[2]*256+d[3] == ast->prefix /*||
1081
                         (d[2] == 'd' && d[3] == 'c') ||
1082
                         (d[2] == 'w' && d[3] == 'b')*/) {
1083

    
1084
//av_log(s, AV_LOG_DEBUG, "OK\n");
1085
                if(d[2]*256+d[3] == ast->prefix)
1086
                    ast->prefix_count++;
1087
                else{
1088
                    ast->prefix= d[2]*256+d[3];
1089
                    ast->prefix_count= 0;
1090
                }
1091

    
1092
                avi->stream_index= n;
1093
                ast->packet_size= size + 8;
1094
                ast->remaining= size;
1095

    
1096
                if(size || !ast->sample_size){
1097
                    uint64_t pos= avio_tell(pb) - 8;
1098
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1099
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1100
                    }
1101
                }
1102
                goto resync;
1103
            }
1104
        }
1105
    }
1106

    
1107
    return AVERROR_EOF;
1108
}
1109

    
1110
/* XXX: We make the implicit supposition that the positions are sorted
1111
   for each stream. */
1112
static int avi_read_idx1(AVFormatContext *s, int size)
1113
{
1114
    AVIContext *avi = s->priv_data;
1115
    AVIOContext *pb = s->pb;
1116
    int nb_index_entries, i;
1117
    AVStream *st;
1118
    AVIStream *ast;
1119
    unsigned int index, tag, flags, pos, len;
1120
    unsigned last_pos= -1;
1121

    
1122
    nb_index_entries = size / 16;
1123
    if (nb_index_entries <= 0)
1124
        return -1;
1125

    
1126
    /* Read the entries and sort them in each stream component. */
1127
    for(i = 0; i < nb_index_entries; i++) {
1128
        tag = avio_rl32(pb);
1129
        flags = avio_rl32(pb);
1130
        pos = avio_rl32(pb);
1131
        len = avio_rl32(pb);
1132
#if defined(DEBUG_SEEK)
1133
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1134
               i, tag, flags, pos, len);
1135
#endif
1136
        if(i==0 && pos > avi->movi_list)
1137
            avi->movi_list= 0; //FIXME better check
1138
        pos += avi->movi_list;
1139

    
1140
        index = ((tag & 0xff) - '0') * 10;
1141
        index += ((tag >> 8) & 0xff) - '0';
1142
        if (index >= s->nb_streams)
1143
            continue;
1144
        st = s->streams[index];
1145
        ast = st->priv_data;
1146

    
1147
#if defined(DEBUG_SEEK)
1148
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1149
#endif
1150
        if(url_feof(pb))
1151
            return -1;
1152

    
1153
        if(last_pos == pos)
1154
            avi->non_interleaved= 1;
1155
        else if(len || !ast->sample_size)
1156
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1157
        ast->cum_len += get_duration(ast, len);
1158
        last_pos= pos;
1159
    }
1160
    return 0;
1161
}
1162

    
1163
static int guess_ni_flag(AVFormatContext *s){
1164
    int i;
1165
    int64_t last_start=0;
1166
    int64_t first_end= INT64_MAX;
1167
    int64_t oldpos= avio_tell(s->pb);
1168

    
1169
    for(i=0; i<s->nb_streams; i++){
1170
        AVStream *st = s->streams[i];
1171
        int n= st->nb_index_entries;
1172
        unsigned int size;
1173

    
1174
        if(n <= 0)
1175
            continue;
1176

    
1177
        if(n >= 2){
1178
            int64_t pos= st->index_entries[0].pos;
1179
            avio_seek(s->pb, pos + 4, SEEK_SET);
1180
            size= avio_rl32(s->pb);
1181
            if(pos + size > st->index_entries[1].pos)
1182
                last_start= INT64_MAX;
1183
        }
1184

    
1185
        if(st->index_entries[0].pos > last_start)
1186
            last_start= st->index_entries[0].pos;
1187
        if(st->index_entries[n-1].pos < first_end)
1188
            first_end= st->index_entries[n-1].pos;
1189
    }
1190
    avio_seek(s->pb, oldpos, SEEK_SET);
1191
    return last_start > first_end;
1192
}
1193

    
1194
static int avi_load_index(AVFormatContext *s)
1195
{
1196
    AVIContext *avi = s->priv_data;
1197
    AVIOContext *pb = s->pb;
1198
    uint32_t tag, size;
1199
    int64_t pos= avio_tell(pb);
1200
    int ret = -1;
1201

    
1202
    if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1203
        goto the_end; // maybe truncated file
1204
#ifdef DEBUG_SEEK
1205
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1206
#endif
1207
    for(;;) {
1208
        if (url_feof(pb))
1209
            break;
1210
        tag = avio_rl32(pb);
1211
        size = avio_rl32(pb);
1212
#ifdef DEBUG_SEEK
1213
        printf("tag=%c%c%c%c size=0x%x\n",
1214
               tag & 0xff,
1215
               (tag >> 8) & 0xff,
1216
               (tag >> 16) & 0xff,
1217
               (tag >> 24) & 0xff,
1218
               size);
1219
#endif
1220
        switch(tag) {
1221
        case MKTAG('i', 'd', 'x', '1'):
1222
            if (avi_read_idx1(s, size) < 0)
1223
                goto skip;
1224
            ret = 0;
1225
                goto the_end;
1226
            break;
1227
        default:
1228
        skip:
1229
            size += (size & 1);
1230
            if (avio_skip(pb, size) < 0)
1231
                goto the_end; // something is wrong here
1232
            break;
1233
        }
1234
    }
1235
 the_end:
1236
    avio_seek(pb, pos, SEEK_SET);
1237
    return ret;
1238
}
1239

    
1240
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1241
{
1242
    AVIStream *ast2 = st2->priv_data;
1243
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1244
    av_free_packet(&ast2->sub_pkt);
1245
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1246
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1247
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1248
}
1249

    
1250
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1251
{
1252
    AVIContext *avi = s->priv_data;
1253
    AVStream *st;
1254
    int i, index;
1255
    int64_t pos;
1256
    AVIStream *ast;
1257

    
1258
    if (!avi->index_loaded) {
1259
        /* we only load the index on demand */
1260
        avi_load_index(s);
1261
        avi->index_loaded = 1;
1262
    }
1263
    assert(stream_index>= 0);
1264

    
1265
    st = s->streams[stream_index];
1266
    ast= st->priv_data;
1267
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1268
    if(index<0)
1269
        return -1;
1270

    
1271
    /* find the position */
1272
    pos = st->index_entries[index].pos;
1273
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1274

    
1275
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1276

    
1277
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1278
        /* One and only one real stream for DV in AVI, and it has video  */
1279
        /* offsets. Calling with other stream indexes should have failed */
1280
        /* the av_index_search_timestamp call above.                     */
1281
        assert(stream_index == 0);
1282

    
1283
        /* Feed the DV video stream version of the timestamp to the */
1284
        /* DV demux so it can synthesize correct timestamps.        */
1285
        dv_offset_reset(avi->dv_demux, timestamp);
1286

    
1287
        avio_seek(s->pb, pos, SEEK_SET);
1288
        avi->stream_index= -1;
1289
        return 0;
1290
    }
1291

    
1292
    for(i = 0; i < s->nb_streams; i++) {
1293
        AVStream *st2 = s->streams[i];
1294
        AVIStream *ast2 = st2->priv_data;
1295

    
1296
        ast2->packet_size=
1297
        ast2->remaining= 0;
1298

    
1299
        if (ast2->sub_ctx) {
1300
            seek_subtitle(st, st2, timestamp);
1301
            continue;
1302
        }
1303

    
1304
        if (st2->nb_index_entries <= 0)
1305
            continue;
1306

    
1307
//        assert(st2->codec->block_align);
1308
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1309
        index = av_index_search_timestamp(
1310
                st2,
1311
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1312
                flags | AVSEEK_FLAG_BACKWARD);
1313
        if(index<0)
1314
            index=0;
1315

    
1316
        if(!avi->non_interleaved){
1317
            while(index>0 && st2->index_entries[index].pos > pos)
1318
                index--;
1319
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1320
                index++;
1321
        }
1322

    
1323
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1324
        /* extract the current frame number */
1325
        ast2->frame_offset = st2->index_entries[index].timestamp;
1326
    }
1327

    
1328
    /* do the seek */
1329
    avio_seek(s->pb, pos, SEEK_SET);
1330
    avi->stream_index= -1;
1331
    return 0;
1332
}
1333

    
1334
static int avi_read_close(AVFormatContext *s)
1335
{
1336
    int i;
1337
    AVIContext *avi = s->priv_data;
1338

    
1339
    for(i=0;i<s->nb_streams;i++) {
1340
        AVStream *st = s->streams[i];
1341
        AVIStream *ast = st->priv_data;
1342
        if (ast) {
1343
            if (ast->sub_ctx) {
1344
                av_freep(&ast->sub_ctx->pb);
1345
                av_close_input_stream(ast->sub_ctx);
1346
            }
1347
            av_free(ast->sub_buffer);
1348
            av_free_packet(&ast->sub_pkt);
1349
        }
1350
    }
1351

    
1352
    av_free(avi->dv_demux);
1353

    
1354
    return 0;
1355
}
1356

    
1357
static int avi_probe(AVProbeData *p)
1358
{
1359
    int i;
1360

    
1361
    /* check file header */
1362
    for(i=0; avi_headers[i][0]; i++)
1363
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1364
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1365
            return AVPROBE_SCORE_MAX;
1366

    
1367
    return 0;
1368
}
1369

    
1370
AVInputFormat ff_avi_demuxer = {
1371
    "avi",
1372
    NULL_IF_CONFIG_SMALL("AVI format"),
1373
    sizeof(AVIContext),
1374
    avi_probe,
1375
    avi_read_header,
1376
    avi_read_packet,
1377
    avi_read_close,
1378
    avi_read_seek,
1379
};