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ffmpeg / libavformat / avidec.c @ dfd2a005

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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 "libavcodec/bytestream.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
} AVIStream;
59

    
60
typedef struct {
61
    int64_t  riff_end;
62
    int64_t  movi_end;
63
    int64_t  fsize;
64
    int64_t movi_list;
65
    int64_t last_pkt_pos;
66
    int index_loaded;
67
    int is_odml;
68
    int non_interleaved;
69
    int stream_index;
70
    DVDemuxContext* dv_demux;
71
    int odml_depth;
72
#define MAX_ODML_DEPTH 1000
73
} AVIContext;
74

    
75
static const char avi_headers[][8] = {
76
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
77
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
78
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
79
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
80
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
81
    { 0 }
82
};
83

    
84
static int avi_load_index(AVFormatContext *s);
85
static int guess_ni_flag(AVFormatContext *s);
86

    
87
#define print_tag(str, tag, size)                       \
88
    av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
89
           str, tag & 0xff,                             \
90
           (tag >> 8) & 0xff,                           \
91
           (tag >> 16) & 0xff,                          \
92
           (tag >> 24) & 0xff,                          \
93
           size)
94

    
95
static inline int get_duration(AVIStream *ast, int len){
96
    if(ast->sample_size){
97
        return len;
98
    }else if (ast->dshow_block_align){
99
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
100
    }else
101
        return 1;
102
}
103

    
104
static int get_riff(AVFormatContext *s, ByteIOContext *pb)
105
{
106
    AVIContext *avi = s->priv_data;
107
    char header[8];
108
    int i;
109

    
110
    /* check RIFF header */
111
    get_buffer(pb, header, 4);
112
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
113
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
114
    get_buffer(pb, header+4, 4);
115

    
116
    for(i=0; avi_headers[i][0]; i++)
117
        if(!memcmp(header, avi_headers[i], 8))
118
            break;
119
    if(!avi_headers[i][0])
120
        return -1;
121

    
122
    if(header[7] == 0x19)
123
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
124

    
125
    return 0;
126
}
127

    
128
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
129
    AVIContext *avi = s->priv_data;
130
    ByteIOContext *pb = s->pb;
131
    int longs_pre_entry= get_le16(pb);
132
    int index_sub_type = get_byte(pb);
133
    int index_type     = get_byte(pb);
134
    int entries_in_use = get_le32(pb);
135
    int chunk_id       = get_le32(pb);
136
    int64_t base       = get_le64(pb);
137
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
138
    AVStream *st;
139
    AVIStream *ast;
140
    int i;
141
    int64_t last_pos= -1;
142
    int64_t filesize= url_fsize(s->pb);
143

    
144
#ifdef DEBUG_SEEK
145
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
146
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
147
#endif
148

    
149
    if(stream_id >= s->nb_streams || stream_id < 0)
150
        return -1;
151
    st= s->streams[stream_id];
152
    ast = st->priv_data;
153

    
154
    if(index_sub_type)
155
        return -1;
156

    
157
    get_le32(pb);
158

    
159
    if(index_type && longs_pre_entry != 2)
160
        return -1;
161
    if(index_type>1)
162
        return -1;
163

    
164
    if(filesize > 0 && base >= filesize){
165
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
166
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
167
            base &= 0xFFFFFFFF;
168
        else
169
            return -1;
170
    }
171

    
172
    for(i=0; i<entries_in_use; i++){
173
        if(index_type){
174
            int64_t pos= get_le32(pb) + base - 8;
175
            int len    = get_le32(pb);
176
            int key= len >= 0;
177
            len &= 0x7FFFFFFF;
178

    
179
#ifdef DEBUG_SEEK
180
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
181
#endif
182
            if(url_feof(pb))
183
                return -1;
184

    
185
            if(last_pos == pos || pos == base - 8)
186
                avi->non_interleaved= 1;
187
            if(last_pos != pos && (len || !ast->sample_size))
188
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
189

    
190
            ast->cum_len += get_duration(ast, len);
191
            last_pos= pos;
192
        }else{
193
            int64_t offset, pos;
194
            int duration;
195
            offset = get_le64(pb);
196
            get_le32(pb);       /* size */
197
            duration = get_le32(pb);
198

    
199
            if(url_feof(pb))
200
                return -1;
201

    
202
            pos = url_ftell(pb);
203

    
204
            if(avi->odml_depth > MAX_ODML_DEPTH){
205
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
206
                return -1;
207
            }
208

    
209
            url_fseek(pb, offset+8, SEEK_SET);
210
            avi->odml_depth++;
211
            read_braindead_odml_indx(s, frame_num);
212
            avi->odml_depth--;
213
            frame_num += duration;
214

    
215
            url_fseek(pb, pos, SEEK_SET);
216
        }
217
    }
218
    avi->index_loaded=1;
219
    return 0;
220
}
221

    
222
static void clean_index(AVFormatContext *s){
223
    int i;
224
    int64_t j;
225

    
226
    for(i=0; i<s->nb_streams; i++){
227
        AVStream *st = s->streams[i];
228
        AVIStream *ast = st->priv_data;
229
        int n= st->nb_index_entries;
230
        int max= ast->sample_size;
231
        int64_t pos, size, ts;
232

    
233
        if(n != 1 || ast->sample_size==0)
234
            continue;
235

    
236
        while(max < 1024) max+=max;
237

    
238
        pos= st->index_entries[0].pos;
239
        size= st->index_entries[0].size;
240
        ts= st->index_entries[0].timestamp;
241

    
242
        for(j=0; j<size; j+=max){
243
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
244
        }
245
    }
246
}
247

    
248
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
249
{
250
    ByteIOContext *pb = s->pb;
251
    char key[5] = {0}, *value;
252

    
253
    size += (size & 1);
254

    
255
    if (size == UINT_MAX)
256
        return -1;
257
    value = av_malloc(size+1);
258
    if (!value)
259
        return -1;
260
    get_buffer(pb, value, size);
261
    value[size]=0;
262

    
263
    AV_WL32(key, tag);
264

    
265
    return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
266
                            AV_METADATA_DONT_STRDUP_VAL);
267
}
268

    
269
static void avi_read_info(AVFormatContext *s, uint64_t end)
270
{
271
    while (url_ftell(s->pb) < end) {
272
        uint32_t tag  = get_le32(s->pb);
273
        uint32_t size = get_le32(s->pb);
274
        avi_read_tag(s, NULL, tag, size);
275
    }
276
}
277

    
278
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
279
                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
280

    
281
static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
282
{
283
    char month[4], time[9], buffer[64];
284
    int i, day, year;
285
    /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
286
    if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
287
               month, &day, time, &year) == 4) {
288
        for (i=0; i<12; i++)
289
            if (!strcasecmp(month, months[i])) {
290
                snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
291
                         year, i+1, day, time);
292
                av_metadata_set2(metadata, "creation_time", buffer, 0);
293
            }
294
    } else if (date[4] == '/' && date[7] == '/') {
295
        date[4] = date[7] = '-';
296
        av_metadata_set2(metadata, "creation_time", date, 0);
297
    }
298
}
299

    
300
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
301
{
302
    while (url_ftell(s->pb) < end) {
303
        uint32_t tag  = get_le32(s->pb);
304
        uint32_t size = get_le32(s->pb);
305
        switch (tag) {
306
        case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
307
            uint64_t tag_end = url_ftell(s->pb) + size;
308
            while (url_ftell(s->pb) < tag_end) {
309
                uint16_t tag  = get_le16(s->pb);
310
                uint16_t size = get_le16(s->pb);
311
                const char *name = NULL;
312
                char buffer[64] = {0};
313
                size -= get_buffer(s->pb, buffer,
314
                                   FFMIN(size, sizeof(buffer)-1));
315
                switch (tag) {
316
                case 0x03:  name = "maker";  break;
317
                case 0x04:  name = "model";  break;
318
                case 0x13:  name = "creation_time";
319
                    if (buffer[4] == ':' && buffer[7] == ':')
320
                        buffer[4] = buffer[7] = '-';
321
                    break;
322
                }
323
                if (name)
324
                    av_metadata_set2(&s->metadata, name, buffer, 0);
325
                url_fskip(s->pb, size);
326
            }
327
            break;
328
        }
329
        default:
330
            url_fskip(s->pb, size);
331
            break;
332
        }
333
    }
334
}
335

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

    
350
    avi->stream_index= -1;
351

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

    
355
    avi->fsize = url_fsize(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 = get_le32(pb);
367
        size = get_le32(pb);
368

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

    
371
        switch(tag) {
372
        case MKTAG('L', 'I', 'S', 'T'):
373
            list_end = url_ftell(pb) + size;
374
            /* Ignored, except at start of video packets. */
375
            tag1 = get_le32(pb);
376

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

    
379
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
380
                avi->movi_list = url_ftell(pb) - 4;
381
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
382
                else     avi->movi_end = url_fsize(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 -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));
396
            url_fskip(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
            url_fskip(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 = get_le32(pb);
410
            bit_rate = get_le32(pb) * 8;
411
            get_le32(pb);
412
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
413

    
414
            url_fskip(pb, 2 * 4);
415
            get_le32(pb);
416
            get_le32(pb);
417
            avih_width=get_le32(pb);
418
            avih_height=get_le32(pb);
419

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

    
425
            tag1 = get_le32(pb);
426
            handler = get_le32(pb); /* codec tag */
427

    
428
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
429
                url_fskip(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
                url_fskip(pb, 3 * 4);
474
                ast->scale = get_le32(pb);
475
                ast->rate = get_le32(pb);
476
                url_fskip(pb, 4);  /* start time */
477

    
478
                dv_dur = get_le32(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
                url_fskip(pb, size - 9*4);
490
                break;
491
            }
492

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

    
496
            get_le32(pb); /* flags */
497
            get_le16(pb); /* priority */
498
            get_le16(pb); /* language */
499
            get_le32(pb); /* initial frame */
500
            ast->scale = get_le32(pb);
501
            ast->rate = get_le32(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=get_le32(pb); /* start */
515
            st->nb_frames = get_le32(pb);
516

    
517
            st->start_time = 0;
518
            get_le32(pb); /* buffer size */
519
            get_le32(pb); /* quality */
520
            ast->sample_size = get_le32(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
            url_fskip(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
                url_fskip(pb, size);
552
            } else {
553
                uint64_t cur_pos = url_ftell(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
                        url_fskip(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
                        get_buffer(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
                        get_byte(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
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
594
#if HAVE_BIGENDIAN
595
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
596
                            st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
597
#else
598
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
599
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
600
#endif
601
                        st->codec->palctrl->palette_changed = 1;
602
                    }
603

    
604
                    print_tag("video", tag1, 0);
605

    
606
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
607
                    st->codec->codec_tag = tag1;
608
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
609
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
610
                    // Support "Resolution 1:1" for Avid AVI Codec
611
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
612
                       st->codec->extradata_size >= 31 &&
613
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
614
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
615

    
616
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
617
                        st->codec->extradata_size+= 9;
618
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
619
                        if(st->codec->extradata)
620
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
621
                    }
622
                    st->codec->height= FFABS(st->codec->height);
623

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

    
678
                st = s->streams[stream_index];
679
                get_le32(pb);
680
                get_le32(pb);
681
                get_le32(pb);
682
                get_le32(pb);
683
                get_le32(pb);
684

    
685
                active_aspect.den= get_le16(pb);
686
                active_aspect.num= get_le16(pb);
687
                active.num       = get_le32(pb);
688
                active.den       = get_le32(pb);
689
                get_le32(pb); //nbFieldsPerFrame
690

    
691
                if(active_aspect.num && active_aspect.den && active.num && active.den){
692
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
693
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
694
                }
695
                size -= 9*4;
696
            }
697
            url_fseek(pb, size, SEEK_CUR);
698
            break;
699
        case MKTAG('s', 't', 'r', 'n'):
700
            if(s->nb_streams){
701
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
702
                break;
703
            }
704
        default:
705
            if(size > 1000000){
706
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
707
                                        "I will ignore it and try to continue anyway.\n");
708
                avi->movi_list = url_ftell(pb) - 4;
709
                avi->movi_end  = url_fsize(pb);
710
                goto end_of_header;
711
            }
712
            /* skip tag */
713
            size += (size & 1);
714
            url_fskip(pb, size);
715
            break;
716
        }
717
    }
718
 end_of_header:
719
    /* check stream number */
720
    if (stream_index != s->nb_streams - 1) {
721
    fail:
722
        return -1;
723
    }
724

    
725
    if(!avi->index_loaded && !url_is_streamed(pb))
726
        avi_load_index(s);
727
    avi->index_loaded = 1;
728
    avi->non_interleaved |= guess_ni_flag(s);
729
    for(i=0; i<s->nb_streams; i++){
730
        AVStream *st = s->streams[i];
731
        if(st->nb_index_entries)
732
            break;
733
    }
734
    if(i==s->nb_streams && avi->non_interleaved) {
735
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
736
        avi->non_interleaved=0;
737
    }
738

    
739
    if(avi->non_interleaved) {
740
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
741
        clean_index(s);
742
    }
743

    
744
    ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
745

    
746
    return 0;
747
}
748

    
749
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
750
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
751
        uint8_t desc[256], *d = desc;
752
        uint8_t *end, *ptr = pkt->data+7;
753
        unsigned int size, desc_len = bytestream_get_le32(&ptr);
754
        int score = AVPROBE_SCORE_MAX / 2;
755
        AVIStream *ast = st->priv_data;
756
        AVInputFormat *sub_demuxer;
757
        AVRational time_base;
758
        ByteIOContext *pb;
759
        AVProbeData pd;
760

    
761
        if (desc_len > FFMAX(pkt->size-17, 0))
762
            return 0;
763

    
764
        end = ptr + desc_len;
765
        while (ptr < end-1) {
766
            uint8_t tmp;
767
            uint32_t ch;
768
            GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);
769
            PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1)  *d++ = tmp;);
770
        }
771
        *d = 0;
772
        if (*desc)
773
            av_metadata_set2(&st->metadata, "title", desc, 0);
774

    
775
        ptr = end + 2;
776
        size = bytestream_get_le32(&ptr);
777
        size = FFMIN(size, pkt->size+pkt->data-ptr);
778

    
779
        pd = (AVProbeData) { .buf = ptr, .buf_size = size };
780
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
781
            return 0;
782

    
783
        pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);
784
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
785
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
786
            *st->codec = *ast->sub_ctx->streams[0]->codec;
787
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
788
            time_base = ast->sub_ctx->streams[0]->time_base;
789
            av_set_pts_info(st, 64, time_base.num, time_base.den);
790
        }
791
        ast->sub_buffer = pkt->data;
792
        memset(pkt, 0, sizeof(*pkt));
793
        return 1;
794
    }
795
    return 0;
796
}
797

    
798
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
799
                                  AVPacket *pkt)
800
{
801
    AVIStream *ast, *next_ast = next_st->priv_data;
802
    int64_t ts, next_ts, ts_min = INT64_MAX;
803
    AVStream *st, *sub_st = NULL;
804
    int i;
805

    
806
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
807
                           AV_TIME_BASE_Q);
808

    
809
    for (i=0; i<s->nb_streams; i++) {
810
        st  = s->streams[i];
811
        ast = st->priv_data;
812
        if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
813
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
814
            if (ts <= next_ts && ts < ts_min) {
815
                ts_min = ts;
816
                sub_st = st;
817
            }
818
        }
819
    }
820

    
821
    if (sub_st) {
822
        ast = sub_st->priv_data;
823
        *pkt = ast->sub_pkt;
824
        pkt->stream_index = sub_st->index;
825
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
826
            ast->sub_pkt.data = NULL;
827
    }
828
    return sub_st;
829
}
830

    
831
static int get_stream_idx(int *d){
832
    if(    d[0] >= '0' && d[0] <= '9'
833
        && d[1] >= '0' && d[1] <= '9'){
834
        return (d[0] - '0') * 10 + (d[1] - '0');
835
    }else{
836
        return 100; //invalid stream ID
837
    }
838
}
839

    
840
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
841
{
842
    AVIContext *avi = s->priv_data;
843
    ByteIOContext *pb = s->pb;
844
    int n, d[8];
845
    unsigned int size;
846
    int64_t i, sync;
847
    void* dstr;
848

    
849
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
850
        int size = dv_get_packet(avi->dv_demux, pkt);
851
        if (size >= 0)
852
            return size;
853
    }
854

    
855
    if(avi->non_interleaved){
856
        int best_stream_index = 0;
857
        AVStream *best_st= NULL;
858
        AVIStream *best_ast;
859
        int64_t best_ts= INT64_MAX;
860
        int i;
861

    
862
        for(i=0; i<s->nb_streams; i++){
863
            AVStream *st = s->streams[i];
864
            AVIStream *ast = st->priv_data;
865
            int64_t ts= ast->frame_offset;
866
            int64_t last_ts;
867

    
868
            if(!st->nb_index_entries)
869
                continue;
870

    
871
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
872
            if(!ast->remaining && ts > last_ts)
873
                continue;
874

    
875
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
876

    
877
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
878
            if(ts < best_ts){
879
                best_ts= ts;
880
                best_st= st;
881
                best_stream_index= i;
882
            }
883
        }
884
        if(!best_st)
885
            return -1;
886

    
887
        best_ast = best_st->priv_data;
888
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
889
        if(best_ast->remaining)
890
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
891
        else{
892
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
893
            if(i>=0)
894
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
895
        }
896

    
897
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
898
        if(i>=0){
899
            int64_t pos= best_st->index_entries[i].pos;
900
            pos += best_ast->packet_size - best_ast->remaining;
901
            url_fseek(s->pb, pos + 8, SEEK_SET);
902
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
903

    
904
            assert(best_ast->remaining <= best_ast->packet_size);
905

    
906
            avi->stream_index= best_stream_index;
907
            if(!best_ast->remaining)
908
                best_ast->packet_size=
909
                best_ast->remaining= best_st->index_entries[i].size;
910
        }
911
    }
912

    
913
resync:
914
    if(avi->stream_index >= 0){
915
        AVStream *st= s->streams[ avi->stream_index ];
916
        AVIStream *ast= st->priv_data;
917
        int size, err;
918

    
919
        if(get_subtitle_pkt(s, st, pkt))
920
            return 0;
921

    
922
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
923
            size= INT_MAX;
924
        else if(ast->sample_size < 32)
925
            // arbitrary multiplier to avoid tiny packets for raw PCM data
926
            size= 1024*ast->sample_size;
927
        else
928
            size= ast->sample_size;
929

    
930
        if(size > ast->remaining)
931
            size= ast->remaining;
932
        avi->last_pkt_pos= url_ftell(pb);
933
        err= av_get_packet(pb, pkt, size);
934
        if(err<0)
935
            return err;
936

    
937
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
938
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
939
            if(ptr){
940
            ast->has_pal=0;
941
            pkt->size += 4*256;
942
            pkt->data= ptr;
943
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
944
            }else
945
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
946
        }
947

    
948
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
949
            dstr = pkt->destruct;
950
            size = dv_produce_packet(avi->dv_demux, pkt,
951
                                    pkt->data, pkt->size);
952
            pkt->destruct = dstr;
953
            pkt->flags |= AV_PKT_FLAG_KEY;
954
            if (size < 0)
955
                av_free_packet(pkt);
956
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
957
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
958
            ast->frame_offset++;
959
            avi->stream_index = -1;
960
            ast->remaining = 0;
961
            goto resync;
962
        } else {
963
            /* XXX: How to handle B-frames in AVI? */
964
            pkt->dts = ast->frame_offset;
965
//                pkt->dts += ast->start;
966
            if(ast->sample_size)
967
                pkt->dts /= ast->sample_size;
968
//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);
969
            pkt->stream_index = avi->stream_index;
970

    
971
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
972
                AVIndexEntry *e;
973
                int index;
974
                assert(st->index_entries);
975

    
976
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
977
                e= &st->index_entries[index];
978

    
979
                if(index >= 0 && e->timestamp == ast->frame_offset){
980
                    if (e->flags & AVINDEX_KEYFRAME)
981
                        pkt->flags |= AV_PKT_FLAG_KEY;
982
                }
983
            } else {
984
                pkt->flags |= AV_PKT_FLAG_KEY;
985
            }
986
            ast->frame_offset += get_duration(ast, pkt->size);
987
        }
988
        ast->remaining -= size;
989
        if(!ast->remaining){
990
            avi->stream_index= -1;
991
            ast->packet_size= 0;
992
        }
993

    
994
        return size;
995
    }
996

    
997
    memset(d, -1, sizeof(int)*8);
998
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
999
        int j;
1000

    
1001
        for(j=0; j<7; j++)
1002
            d[j]= d[j+1];
1003
        d[7]= get_byte(pb);
1004

    
1005
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1006

    
1007
        n= get_stream_idx(d+2);
1008
//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);
1009
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
1010
            continue;
1011

    
1012
        //parse ix##
1013
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1014
        //parse JUNK
1015
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1016
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1017
            url_fskip(pb, size);
1018
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
1019
            goto resync;
1020
        }
1021

    
1022
        //parse stray LIST
1023
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1024
            url_fskip(pb, 4);
1025
            goto resync;
1026
        }
1027

    
1028
        n= get_stream_idx(d);
1029

    
1030
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1031
            continue;
1032

    
1033
        //detect ##ix chunk and skip
1034
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1035
            url_fskip(pb, size);
1036
            goto resync;
1037
        }
1038

    
1039
        //parse ##dc/##wb
1040
        if(n < s->nb_streams){
1041
            AVStream *st;
1042
            AVIStream *ast;
1043
            st = s->streams[n];
1044
            ast = st->priv_data;
1045

    
1046
            if(s->nb_streams>=2){
1047
                AVStream *st1  = s->streams[1];
1048
                AVIStream *ast1= st1->priv_data;
1049
                //workaround for broken small-file-bug402.avi
1050
                if(   d[2] == 'w' && d[3] == 'b'
1051
                   && n==0
1052
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1053
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1054
                   && ast->prefix == 'd'*256+'c'
1055
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1056
                  ){
1057
                    n=1;
1058
                    st = st1;
1059
                    ast = ast1;
1060
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1061
                }
1062
            }
1063

    
1064

    
1065
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1066
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1067
               || st->discard >= AVDISCARD_ALL){
1068
                ast->frame_offset += get_duration(ast, size);
1069
                url_fskip(pb, size);
1070
                goto resync;
1071
            }
1072

    
1073
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1074
                int k = get_byte(pb);
1075
                int last = (k + get_byte(pb) - 1) & 0xFF;
1076

    
1077
                get_le16(pb); //flags
1078

    
1079
                for (; k <= last; k++)
1080
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
1081
                ast->has_pal= 1;
1082
                goto resync;
1083
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1084
                         d[2]*256+d[3] == ast->prefix /*||
1085
                         (d[2] == 'd' && d[3] == 'c') ||
1086
                         (d[2] == 'w' && d[3] == 'b')*/) {
1087

    
1088
//av_log(s, AV_LOG_DEBUG, "OK\n");
1089
                if(d[2]*256+d[3] == ast->prefix)
1090
                    ast->prefix_count++;
1091
                else{
1092
                    ast->prefix= d[2]*256+d[3];
1093
                    ast->prefix_count= 0;
1094
                }
1095

    
1096
                avi->stream_index= n;
1097
                ast->packet_size= size + 8;
1098
                ast->remaining= size;
1099

    
1100
                if(size || !ast->sample_size){
1101
                    uint64_t pos= url_ftell(pb) - 8;
1102
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1103
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1104
                    }
1105
                }
1106
                goto resync;
1107
            }
1108
        }
1109
    }
1110

    
1111
    return AVERROR_EOF;
1112
}
1113

    
1114
/* XXX: We make the implicit supposition that the positions are sorted
1115
   for each stream. */
1116
static int avi_read_idx1(AVFormatContext *s, int size)
1117
{
1118
    AVIContext *avi = s->priv_data;
1119
    ByteIOContext *pb = s->pb;
1120
    int nb_index_entries, i;
1121
    AVStream *st;
1122
    AVIStream *ast;
1123
    unsigned int index, tag, flags, pos, len;
1124
    unsigned last_pos= -1;
1125

    
1126
    nb_index_entries = size / 16;
1127
    if (nb_index_entries <= 0)
1128
        return -1;
1129

    
1130
    /* Read the entries and sort them in each stream component. */
1131
    for(i = 0; i < nb_index_entries; i++) {
1132
        tag = get_le32(pb);
1133
        flags = get_le32(pb);
1134
        pos = get_le32(pb);
1135
        len = get_le32(pb);
1136
#if defined(DEBUG_SEEK)
1137
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1138
               i, tag, flags, pos, len);
1139
#endif
1140
        if(i==0 && pos > avi->movi_list)
1141
            avi->movi_list= 0; //FIXME better check
1142
        pos += avi->movi_list;
1143

    
1144
        index = ((tag & 0xff) - '0') * 10;
1145
        index += ((tag >> 8) & 0xff) - '0';
1146
        if (index >= s->nb_streams)
1147
            continue;
1148
        st = s->streams[index];
1149
        ast = st->priv_data;
1150

    
1151
#if defined(DEBUG_SEEK)
1152
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1153
#endif
1154
        if(url_feof(pb))
1155
            return -1;
1156

    
1157
        if(last_pos == pos)
1158
            avi->non_interleaved= 1;
1159
        else if(len || !ast->sample_size)
1160
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1161
        ast->cum_len += get_duration(ast, len);
1162
        last_pos= pos;
1163
    }
1164
    return 0;
1165
}
1166

    
1167
static int guess_ni_flag(AVFormatContext *s){
1168
    int i;
1169
    int64_t last_start=0;
1170
    int64_t first_end= INT64_MAX;
1171
    int64_t oldpos= url_ftell(s->pb);
1172

    
1173
    for(i=0; i<s->nb_streams; i++){
1174
        AVStream *st = s->streams[i];
1175
        int n= st->nb_index_entries;
1176
        unsigned int size;
1177

    
1178
        if(n <= 0)
1179
            continue;
1180

    
1181
        if(n >= 2){
1182
            int64_t pos= st->index_entries[0].pos;
1183
            url_fseek(s->pb, pos + 4, SEEK_SET);
1184
            size= get_le32(s->pb);
1185
            if(pos + size > st->index_entries[1].pos)
1186
                last_start= INT64_MAX;
1187
        }
1188

    
1189
        if(st->index_entries[0].pos > last_start)
1190
            last_start= st->index_entries[0].pos;
1191
        if(st->index_entries[n-1].pos < first_end)
1192
            first_end= st->index_entries[n-1].pos;
1193
    }
1194
    url_fseek(s->pb, oldpos, SEEK_SET);
1195
    return last_start > first_end;
1196
}
1197

    
1198
static int avi_load_index(AVFormatContext *s)
1199
{
1200
    AVIContext *avi = s->priv_data;
1201
    ByteIOContext *pb = s->pb;
1202
    uint32_t tag, size;
1203
    int64_t pos= url_ftell(pb);
1204
    int ret = -1;
1205

    
1206
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1207
        goto the_end; // maybe truncated file
1208
#ifdef DEBUG_SEEK
1209
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1210
#endif
1211
    for(;;) {
1212
        if (url_feof(pb))
1213
            break;
1214
        tag = get_le32(pb);
1215
        size = get_le32(pb);
1216
#ifdef DEBUG_SEEK
1217
        printf("tag=%c%c%c%c size=0x%x\n",
1218
               tag & 0xff,
1219
               (tag >> 8) & 0xff,
1220
               (tag >> 16) & 0xff,
1221
               (tag >> 24) & 0xff,
1222
               size);
1223
#endif
1224
        switch(tag) {
1225
        case MKTAG('i', 'd', 'x', '1'):
1226
            if (avi_read_idx1(s, size) < 0)
1227
                goto skip;
1228
            ret = 0;
1229
                goto the_end;
1230
            break;
1231
        default:
1232
        skip:
1233
            size += (size & 1);
1234
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1235
                goto the_end; // something is wrong here
1236
            break;
1237
        }
1238
    }
1239
 the_end:
1240
    url_fseek(pb, pos, SEEK_SET);
1241
    return ret;
1242
}
1243

    
1244
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1245
{
1246
    AVIStream *ast2 = st2->priv_data;
1247
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1248
    av_free_packet(&ast2->sub_pkt);
1249
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1250
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1251
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1252
}
1253

    
1254
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1255
{
1256
    AVIContext *avi = s->priv_data;
1257
    AVStream *st;
1258
    int i, index;
1259
    int64_t pos;
1260
    AVIStream *ast;
1261

    
1262
    if (!avi->index_loaded) {
1263
        /* we only load the index on demand */
1264
        avi_load_index(s);
1265
        avi->index_loaded = 1;
1266
    }
1267
    assert(stream_index>= 0);
1268

    
1269
    st = s->streams[stream_index];
1270
    ast= st->priv_data;
1271
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1272
    if(index<0)
1273
        return -1;
1274

    
1275
    /* find the position */
1276
    pos = st->index_entries[index].pos;
1277
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1278

    
1279
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1280

    
1281
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1282
        /* One and only one real stream for DV in AVI, and it has video  */
1283
        /* offsets. Calling with other stream indexes should have failed */
1284
        /* the av_index_search_timestamp call above.                     */
1285
        assert(stream_index == 0);
1286

    
1287
        /* Feed the DV video stream version of the timestamp to the */
1288
        /* DV demux so it can synthesize correct timestamps.        */
1289
        dv_offset_reset(avi->dv_demux, timestamp);
1290

    
1291
        url_fseek(s->pb, pos, SEEK_SET);
1292
        avi->stream_index= -1;
1293
        return 0;
1294
    }
1295

    
1296
    for(i = 0; i < s->nb_streams; i++) {
1297
        AVStream *st2 = s->streams[i];
1298
        AVIStream *ast2 = st2->priv_data;
1299

    
1300
        ast2->packet_size=
1301
        ast2->remaining= 0;
1302

    
1303
        if (ast2->sub_ctx) {
1304
            seek_subtitle(st, st2, timestamp);
1305
            continue;
1306
        }
1307

    
1308
        if (st2->nb_index_entries <= 0)
1309
            continue;
1310

    
1311
//        assert(st2->codec->block_align);
1312
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1313
        index = av_index_search_timestamp(
1314
                st2,
1315
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1316
                flags | AVSEEK_FLAG_BACKWARD);
1317
        if(index<0)
1318
            index=0;
1319

    
1320
        if(!avi->non_interleaved){
1321
            while(index>0 && st2->index_entries[index].pos > pos)
1322
                index--;
1323
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1324
                index++;
1325
        }
1326

    
1327
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1328
        /* extract the current frame number */
1329
        ast2->frame_offset = st2->index_entries[index].timestamp;
1330
    }
1331

    
1332
    /* do the seek */
1333
    url_fseek(s->pb, pos, SEEK_SET);
1334
    avi->stream_index= -1;
1335
    return 0;
1336
}
1337

    
1338
static int avi_read_close(AVFormatContext *s)
1339
{
1340
    int i;
1341
    AVIContext *avi = s->priv_data;
1342

    
1343
    for(i=0;i<s->nb_streams;i++) {
1344
        AVStream *st = s->streams[i];
1345
        AVIStream *ast = st->priv_data;
1346
        av_free(st->codec->palctrl);
1347
        if (ast) {
1348
            if (ast->sub_ctx) {
1349
                av_freep(&ast->sub_ctx->pb);
1350
                av_close_input_stream(ast->sub_ctx);
1351
            }
1352
            av_free(ast->sub_buffer);
1353
            av_free_packet(&ast->sub_pkt);
1354
        }
1355
    }
1356

    
1357
    if (avi->dv_demux)
1358
        av_free(avi->dv_demux);
1359

    
1360
    return 0;
1361
}
1362

    
1363
static int avi_probe(AVProbeData *p)
1364
{
1365
    int i;
1366

    
1367
    /* check file header */
1368
    for(i=0; avi_headers[i][0]; i++)
1369
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1370
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1371
            return AVPROBE_SCORE_MAX;
1372

    
1373
    return 0;
1374
}
1375

    
1376
AVInputFormat ff_avi_demuxer = {
1377
    "avi",
1378
    NULL_IF_CONFIG_SMALL("AVI format"),
1379
    sizeof(AVIContext),
1380
    avi_probe,
1381
    avi_read_header,
1382
    avi_read_packet,
1383
    avi_read_close,
1384
    avi_read_seek,
1385
};