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ffmpeg / libavformat / avidec.c @ 73d0e331

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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
#ifdef DEBUG
88
static void print_tag(const char *str, unsigned int tag, int size)
89
{
90
    dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
91
           str, tag & 0xff,
92
           (tag >> 8) & 0xff,
93
           (tag >> 16) & 0xff,
94
           (tag >> 24) & 0xff,
95
           size);
96
}
97
#endif
98

    
99
static inline int get_duration(AVIStream *ast, int len){
100
    if(ast->sample_size){
101
        return len;
102
    }else if (ast->dshow_block_align){
103
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
104
    }else
105
        return 1;
106
}
107

    
108
static int get_riff(AVFormatContext *s, ByteIOContext *pb)
109
{
110
    AVIContext *avi = s->priv_data;
111
    char header[8];
112
    int i;
113

    
114
    /* check RIFF header */
115
    get_buffer(pb, header, 4);
116
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
117
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
118
    get_buffer(pb, header+4, 4);
119

    
120
    for(i=0; avi_headers[i][0]; i++)
121
        if(!memcmp(header, avi_headers[i], 8))
122
            break;
123
    if(!avi_headers[i][0])
124
        return -1;
125

    
126
    if(header[7] == 0x19)
127
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
128

    
129
    return 0;
130
}
131

    
132
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
133
    AVIContext *avi = s->priv_data;
134
    ByteIOContext *pb = s->pb;
135
    int longs_pre_entry= get_le16(pb);
136
    int index_sub_type = get_byte(pb);
137
    int index_type     = get_byte(pb);
138
    int entries_in_use = get_le32(pb);
139
    int chunk_id       = get_le32(pb);
140
    int64_t base       = get_le64(pb);
141
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
142
    AVStream *st;
143
    AVIStream *ast;
144
    int i;
145
    int64_t last_pos= -1;
146
    int64_t filesize= url_fsize(s->pb);
147

    
148
#ifdef DEBUG_SEEK
149
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
150
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
151
#endif
152

    
153
    if(stream_id >= s->nb_streams || stream_id < 0)
154
        return -1;
155
    st= s->streams[stream_id];
156
    ast = st->priv_data;
157

    
158
    if(index_sub_type)
159
        return -1;
160

    
161
    get_le32(pb);
162

    
163
    if(index_type && longs_pre_entry != 2)
164
        return -1;
165
    if(index_type>1)
166
        return -1;
167

    
168
    if(filesize > 0 && base >= filesize){
169
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
170
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
171
            base &= 0xFFFFFFFF;
172
        else
173
            return -1;
174
    }
175

    
176
    for(i=0; i<entries_in_use; i++){
177
        if(index_type){
178
            int64_t pos= get_le32(pb) + base - 8;
179
            int len    = get_le32(pb);
180
            int key= len >= 0;
181
            len &= 0x7FFFFFFF;
182

    
183
#ifdef DEBUG_SEEK
184
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
185
#endif
186
            if(url_feof(pb))
187
                return -1;
188

    
189
            if(last_pos == pos || pos == base - 8)
190
                avi->non_interleaved= 1;
191
            if(last_pos != pos && (len || !ast->sample_size))
192
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
193

    
194
            ast->cum_len += get_duration(ast, len);
195
            last_pos= pos;
196
        }else{
197
            int64_t offset, pos;
198
            int duration;
199
            offset = get_le64(pb);
200
            get_le32(pb);       /* size */
201
            duration = get_le32(pb);
202

    
203
            if(url_feof(pb))
204
                return -1;
205

    
206
            pos = url_ftell(pb);
207

    
208
            if(avi->odml_depth > MAX_ODML_DEPTH){
209
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
210
                return -1;
211
            }
212

    
213
            url_fseek(pb, offset+8, SEEK_SET);
214
            avi->odml_depth++;
215
            read_braindead_odml_indx(s, frame_num);
216
            avi->odml_depth--;
217
            frame_num += duration;
218

    
219
            url_fseek(pb, pos, SEEK_SET);
220
        }
221
    }
222
    avi->index_loaded=1;
223
    return 0;
224
}
225

    
226
static void clean_index(AVFormatContext *s){
227
    int i;
228
    int64_t j;
229

    
230
    for(i=0; i<s->nb_streams; i++){
231
        AVStream *st = s->streams[i];
232
        AVIStream *ast = st->priv_data;
233
        int n= st->nb_index_entries;
234
        int max= ast->sample_size;
235
        int64_t pos, size, ts;
236

    
237
        if(n != 1 || ast->sample_size==0)
238
            continue;
239

    
240
        while(max < 1024) max+=max;
241

    
242
        pos= st->index_entries[0].pos;
243
        size= st->index_entries[0].size;
244
        ts= st->index_entries[0].timestamp;
245

    
246
        for(j=0; j<size; j+=max){
247
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
248
        }
249
    }
250
}
251

    
252
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
253
{
254
    ByteIOContext *pb = s->pb;
255
    char key[5] = {0}, *value;
256

    
257
    size += (size & 1);
258

    
259
    if (size == UINT_MAX)
260
        return -1;
261
    value = av_malloc(size+1);
262
    if (!value)
263
        return -1;
264
    get_buffer(pb, value, size);
265
    value[size]=0;
266

    
267
    AV_WL32(key, tag);
268

    
269
    return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
270
                            AV_METADATA_DONT_STRDUP_VAL);
271
}
272

    
273
static void avi_read_info(AVFormatContext *s, uint64_t end)
274
{
275
    while (url_ftell(s->pb) < end) {
276
        uint32_t tag  = get_le32(s->pb);
277
        uint32_t size = get_le32(s->pb);
278
        avi_read_tag(s, NULL, tag, size);
279
    }
280
}
281

    
282
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
283
                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
284

    
285
static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
286
{
287
    char month[4], time[9], buffer[64];
288
    int i, day, year;
289
    /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
290
    if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
291
               month, &day, time, &year) == 4) {
292
        for (i=0; i<12; i++)
293
            if (!strcasecmp(month, months[i])) {
294
                snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
295
                         year, i+1, day, time);
296
                av_metadata_set2(metadata, "creation_time", buffer, 0);
297
            }
298
    } else if (date[4] == '/' && date[7] == '/') {
299
        date[4] = date[7] = '-';
300
        av_metadata_set2(metadata, "creation_time", date, 0);
301
    }
302
}
303

    
304
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
305
{
306
    AVIContext *avi = s->priv_data;
307
    ByteIOContext *pb = s->pb;
308
    unsigned int tag, tag1, handler;
309
    int codec_type, stream_index, frame_period, bit_rate;
310
    unsigned int size;
311
    int i;
312
    AVStream *st;
313
    AVIStream *ast = NULL;
314
    int avih_width=0, avih_height=0;
315
    int amv_file_format=0;
316
    uint64_t list_end = 0;
317

    
318
    avi->stream_index= -1;
319

    
320
    if (get_riff(s, pb) < 0)
321
        return -1;
322

    
323
    avi->fsize = url_fsize(pb);
324
    if(avi->fsize<=0)
325
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
326

    
327
    /* first list tag */
328
    stream_index = -1;
329
    codec_type = -1;
330
    frame_period = 0;
331
    for(;;) {
332
        if (url_feof(pb))
333
            goto fail;
334
        tag = get_le32(pb);
335
        size = get_le32(pb);
336
#ifdef DEBUG
337
        print_tag("tag", tag, size);
338
#endif
339

    
340
        switch(tag) {
341
        case MKTAG('L', 'I', 'S', 'T'):
342
            list_end = url_ftell(pb) + size;
343
            /* Ignored, except at start of video packets. */
344
            tag1 = get_le32(pb);
345
#ifdef DEBUG
346
            print_tag("list", tag1, 0);
347
#endif
348
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
349
                avi->movi_list = url_ftell(pb) - 4;
350
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
351
                else     avi->movi_end = url_fsize(pb);
352
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
353
                goto end_of_header;
354
            }
355
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
356
                avi_read_info(s, list_end);
357

    
358
            break;
359
        case MKTAG('I', 'D', 'I', 'T'): {
360
            unsigned char date[64] = {0};
361
            size += (size & 1);
362
            size -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));
363
            url_fskip(pb, size);
364
            avi_metadata_creation_time(&s->metadata, date);
365
            break;
366
        }
367
        case MKTAG('d', 'm', 'l', 'h'):
368
            avi->is_odml = 1;
369
            url_fskip(pb, size + (size & 1));
370
            break;
371
        case MKTAG('a', 'm', 'v', 'h'):
372
            amv_file_format=1;
373
        case MKTAG('a', 'v', 'i', 'h'):
374
            /* AVI header */
375
            /* using frame_period is bad idea */
376
            frame_period = get_le32(pb);
377
            bit_rate = get_le32(pb) * 8;
378
            get_le32(pb);
379
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
380

    
381
            url_fskip(pb, 2 * 4);
382
            get_le32(pb);
383
            get_le32(pb);
384
            avih_width=get_le32(pb);
385
            avih_height=get_le32(pb);
386

    
387
            url_fskip(pb, size - 10 * 4);
388
            break;
389
        case MKTAG('s', 't', 'r', 'h'):
390
            /* stream header */
391

    
392
            tag1 = get_le32(pb);
393
            handler = get_le32(pb); /* codec tag */
394

    
395
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
396
                url_fskip(pb, size - 8);
397
                break;
398
            }else{
399
                stream_index++;
400
                st = av_new_stream(s, stream_index);
401
                if (!st)
402
                    goto fail;
403

    
404
                ast = av_mallocz(sizeof(AVIStream));
405
                if (!ast)
406
                    goto fail;
407
                st->priv_data = ast;
408
            }
409
            if(amv_file_format)
410
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
411

    
412
#ifdef DEBUG
413
            print_tag("strh", tag1, -1);
414
#endif
415
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
416
                int64_t dv_dur;
417

    
418
                /*
419
                 * After some consideration -- I don't think we
420
                 * have to support anything but DV in type1 AVIs.
421
                 */
422
                if (s->nb_streams != 1)
423
                    goto fail;
424

    
425
                if (handler != MKTAG('d', 'v', 's', 'd') &&
426
                    handler != MKTAG('d', 'v', 'h', 'd') &&
427
                    handler != MKTAG('d', 'v', 's', 'l'))
428
                   goto fail;
429

    
430
                ast = s->streams[0]->priv_data;
431
                av_freep(&s->streams[0]->codec->extradata);
432
                av_freep(&s->streams[0]->codec);
433
                av_freep(&s->streams[0]);
434
                s->nb_streams = 0;
435
                if (CONFIG_DV_DEMUXER) {
436
                    avi->dv_demux = dv_init_demux(s);
437
                    if (!avi->dv_demux)
438
                        goto fail;
439
                }
440
                s->streams[0]->priv_data = ast;
441
                url_fskip(pb, 3 * 4);
442
                ast->scale = get_le32(pb);
443
                ast->rate = get_le32(pb);
444
                url_fskip(pb, 4);  /* start time */
445

    
446
                dv_dur = get_le32(pb);
447
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
448
                    dv_dur *= AV_TIME_BASE;
449
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
450
                }
451
                /*
452
                 * else, leave duration alone; timing estimation in utils.c
453
                 *      will make a guess based on bitrate.
454
                 */
455

    
456
                stream_index = s->nb_streams - 1;
457
                url_fskip(pb, size - 9*4);
458
                break;
459
            }
460

    
461
            assert(stream_index < s->nb_streams);
462
            st->codec->stream_codec_tag= handler;
463

    
464
            get_le32(pb); /* flags */
465
            get_le16(pb); /* priority */
466
            get_le16(pb); /* language */
467
            get_le32(pb); /* initial frame */
468
            ast->scale = get_le32(pb);
469
            ast->rate = get_le32(pb);
470
            if(!(ast->scale && ast->rate)){
471
                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);
472
                if(frame_period){
473
                    ast->rate = 1000000;
474
                    ast->scale = frame_period;
475
                }else{
476
                    ast->rate = 25;
477
                    ast->scale = 1;
478
                }
479
            }
480
            av_set_pts_info(st, 64, ast->scale, ast->rate);
481

    
482
            ast->cum_len=get_le32(pb); /* start */
483
            st->nb_frames = get_le32(pb);
484

    
485
            st->start_time = 0;
486
            get_le32(pb); /* buffer size */
487
            get_le32(pb); /* quality */
488
            ast->sample_size = get_le32(pb); /* sample ssize */
489
            ast->cum_len *= FFMAX(1, ast->sample_size);
490
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
491

    
492
            switch(tag1) {
493
            case MKTAG('v', 'i', 'd', 's'):
494
                codec_type = AVMEDIA_TYPE_VIDEO;
495

    
496
                ast->sample_size = 0;
497
                break;
498
            case MKTAG('a', 'u', 'd', 's'):
499
                codec_type = AVMEDIA_TYPE_AUDIO;
500
                break;
501
            case MKTAG('t', 'x', 't', 's'):
502
                codec_type = AVMEDIA_TYPE_SUBTITLE;
503
                break;
504
            case MKTAG('d', 'a', 't', 's'):
505
                codec_type = AVMEDIA_TYPE_DATA;
506
                break;
507
            default:
508
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
509
                goto fail;
510
            }
511
            if(ast->sample_size == 0)
512
                st->duration = st->nb_frames;
513
            ast->frame_offset= ast->cum_len;
514
            url_fskip(pb, size - 12 * 4);
515
            break;
516
        case MKTAG('s', 't', 'r', 'f'):
517
            /* stream header */
518
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
519
                url_fskip(pb, size);
520
            } else {
521
                uint64_t cur_pos = url_ftell(pb);
522
                if (cur_pos < list_end)
523
                    size = FFMIN(size, list_end - cur_pos);
524
                st = s->streams[stream_index];
525
                switch(codec_type) {
526
                case AVMEDIA_TYPE_VIDEO:
527
                    if(amv_file_format){
528
                        st->codec->width=avih_width;
529
                        st->codec->height=avih_height;
530
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
531
                        st->codec->codec_id = CODEC_ID_AMV;
532
                        url_fskip(pb, size);
533
                        break;
534
                    }
535
                    get_le32(pb); /* size */
536
                    st->codec->width = get_le32(pb);
537
                    st->codec->height = (int32_t)get_le32(pb);
538
                    get_le16(pb); /* panes */
539
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
540
                    tag1 = get_le32(pb);
541
                    get_le32(pb); /* ImageSize */
542
                    get_le32(pb); /* XPelsPerMeter */
543
                    get_le32(pb); /* YPelsPerMeter */
544
                    get_le32(pb); /* ClrUsed */
545
                    get_le32(pb); /* ClrImportant */
546

    
547
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
548
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
549
                        st->codec->codec_tag = tag1;
550
                        st->codec->codec_id = CODEC_ID_XSUB;
551
                        break;
552
                    }
553

    
554
                    if(size > 10*4 && size<(1<<30)){
555
                        st->codec->extradata_size= size - 10*4;
556
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
557
                        if (!st->codec->extradata) {
558
                            st->codec->extradata_size= 0;
559
                            return AVERROR(ENOMEM);
560
                        }
561
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
562
                    }
563

    
564
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
565
                        get_byte(pb);
566

    
567
                    /* Extract palette from extradata if bpp <= 8. */
568
                    /* This code assumes that extradata contains only palette. */
569
                    /* This is true for all paletted codecs implemented in FFmpeg. */
570
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
571
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
572
#if HAVE_BIGENDIAN
573
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
574
                            st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
575
#else
576
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
577
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
578
#endif
579
                        st->codec->palctrl->palette_changed = 1;
580
                    }
581

    
582
#ifdef DEBUG
583
                    print_tag("video", tag1, 0);
584
#endif
585
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
586
                    st->codec->codec_tag = tag1;
587
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
588
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
589
                    // Support "Resolution 1:1" for Avid AVI Codec
590
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
591
                       st->codec->extradata_size >= 31 &&
592
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
593
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
594

    
595
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
596
                        st->codec->extradata_size+= 9;
597
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
598
                        if(st->codec->extradata)
599
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
600
                    }
601
                    st->codec->height= FFABS(st->codec->height);
602

    
603
//                    url_fskip(pb, size - 5 * 4);
604
                    break;
605
                case AVMEDIA_TYPE_AUDIO:
606
                    ff_get_wav_header(pb, st->codec, size);
607
                    ast->dshow_block_align= st->codec->block_align;
608
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
609
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
610
                        ast->sample_size= st->codec->block_align;
611
                    }
612
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
613
                        url_fskip(pb, 1);
614
                    /* Force parsing as several audio frames can be in
615
                     * one packet and timestamps refer to packet start. */
616
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
617
                    /* ADTS header is in extradata, AAC without header must be
618
                     * stored as exact frames. Parser not needed and it will
619
                     * fail. */
620
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
621
                        st->need_parsing = AVSTREAM_PARSE_NONE;
622
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
623
                     * audio in the header but have Axan as stream_code_tag. */
624
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
625
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
626
                        st->codec->codec_tag = 0;
627
                    }
628
                    if (amv_file_format){
629
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
630
                        ast->dshow_block_align = 0;
631
                    }
632
                    break;
633
                case AVMEDIA_TYPE_SUBTITLE:
634
                    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
635
                    st->codec->codec_id   = CODEC_ID_PROBE;
636
                    break;
637
                default:
638
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
639
                    st->codec->codec_id= CODEC_ID_NONE;
640
                    st->codec->codec_tag= 0;
641
                    url_fskip(pb, size);
642
                    break;
643
                }
644
            }
645
            break;
646
        case MKTAG('i', 'n', 'd', 'x'):
647
            i= url_ftell(pb);
648
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
649
                read_braindead_odml_indx(s, 0);
650
            }
651
            url_fseek(pb, i+size, SEEK_SET);
652
            break;
653
        case MKTAG('v', 'p', 'r', 'p'):
654
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
655
                AVRational active, active_aspect;
656

    
657
                st = s->streams[stream_index];
658
                get_le32(pb);
659
                get_le32(pb);
660
                get_le32(pb);
661
                get_le32(pb);
662
                get_le32(pb);
663

    
664
                active_aspect.den= get_le16(pb);
665
                active_aspect.num= get_le16(pb);
666
                active.num       = get_le32(pb);
667
                active.den       = get_le32(pb);
668
                get_le32(pb); //nbFieldsPerFrame
669

    
670
                if(active_aspect.num && active_aspect.den && active.num && active.den){
671
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
672
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
673
                }
674
                size -= 9*4;
675
            }
676
            url_fseek(pb, size, SEEK_CUR);
677
            break;
678
        case MKTAG('s', 't', 'r', 'n'):
679
            if(s->nb_streams){
680
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
681
                break;
682
            }
683
        default:
684
            if(size > 1000000){
685
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
686
                                        "I will ignore it and try to continue anyway.\n");
687
                avi->movi_list = url_ftell(pb) - 4;
688
                avi->movi_end  = url_fsize(pb);
689
                goto end_of_header;
690
            }
691
            /* skip tag */
692
            size += (size & 1);
693
            url_fskip(pb, size);
694
            break;
695
        }
696
    }
697
 end_of_header:
698
    /* check stream number */
699
    if (stream_index != s->nb_streams - 1) {
700
    fail:
701
        return -1;
702
    }
703

    
704
    if(!avi->index_loaded && !url_is_streamed(pb))
705
        avi_load_index(s);
706
    avi->index_loaded = 1;
707
    avi->non_interleaved |= guess_ni_flag(s);
708
    for(i=0; i<s->nb_streams; i++){
709
        AVStream *st = s->streams[i];
710
        if(st->nb_index_entries)
711
            break;
712
    }
713
    if(i==s->nb_streams && avi->non_interleaved) {
714
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
715
        avi->non_interleaved=0;
716
    }
717

    
718
    if(avi->non_interleaved) {
719
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
720
        clean_index(s);
721
    }
722

    
723
    ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
724

    
725
    return 0;
726
}
727

    
728
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
729
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
730
        uint8_t desc[256], *d = desc;
731
        uint8_t *end, *ptr = pkt->data+7;
732
        unsigned int size, desc_len = bytestream_get_le32(&ptr);
733
        int score = AVPROBE_SCORE_MAX / 2;
734
        AVIStream *ast = st->priv_data;
735
        AVInputFormat *sub_demuxer;
736
        AVRational time_base;
737
        ByteIOContext *pb;
738
        AVProbeData pd;
739

    
740
        if (desc_len > FFMAX(pkt->size-17, 0))
741
            return 0;
742

    
743
        end = ptr + desc_len;
744
        while (ptr < end-1) {
745
            uint8_t tmp;
746
            uint32_t ch;
747
            GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);
748
            PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1)  *d++ = tmp;);
749
        }
750
        *d = 0;
751
        if (*desc)
752
            av_metadata_set2(&st->metadata, "title", desc, 0);
753

    
754
        ptr = end + 2;
755
        size = bytestream_get_le32(&ptr);
756
        size = FFMIN(size, pkt->size+pkt->data-ptr);
757

    
758
        pd = (AVProbeData) { .buf = ptr, .buf_size = size };
759
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
760
            return 0;
761

    
762
        pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);
763
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
764
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
765
            *st->codec = *ast->sub_ctx->streams[0]->codec;
766
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
767
            time_base = ast->sub_ctx->streams[0]->time_base;
768
            av_set_pts_info(st, 64, time_base.num, time_base.den);
769
        }
770
        ast->sub_buffer = pkt->data;
771
        memset(pkt, 0, sizeof(*pkt));
772
        return 1;
773
    }
774
    return 0;
775
}
776

    
777
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
778
                                  AVPacket *pkt)
779
{
780
    AVIStream *ast, *next_ast = next_st->priv_data;
781
    int64_t ts, next_ts, ts_min = INT64_MAX;
782
    AVStream *st, *sub_st = NULL;
783
    int i;
784

    
785
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
786
                           AV_TIME_BASE_Q);
787

    
788
    for (i=0; i<s->nb_streams; i++) {
789
        st  = s->streams[i];
790
        ast = st->priv_data;
791
        if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
792
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
793
            if (ts <= next_ts && ts < ts_min) {
794
                ts_min = ts;
795
                sub_st = st;
796
            }
797
        }
798
    }
799

    
800
    if (sub_st) {
801
        ast = sub_st->priv_data;
802
        *pkt = ast->sub_pkt;
803
        pkt->stream_index = sub_st->index;
804
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
805
            ast->sub_pkt.data = NULL;
806
    }
807
    return sub_st;
808
}
809

    
810
static int get_stream_idx(int *d){
811
    if(    d[0] >= '0' && d[0] <= '9'
812
        && d[1] >= '0' && d[1] <= '9'){
813
        return (d[0] - '0') * 10 + (d[1] - '0');
814
    }else{
815
        return 100; //invalid stream ID
816
    }
817
}
818

    
819
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
820
{
821
    AVIContext *avi = s->priv_data;
822
    ByteIOContext *pb = s->pb;
823
    int n, d[8];
824
    unsigned int size;
825
    int64_t i, sync;
826
    void* dstr;
827

    
828
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
829
        int size = dv_get_packet(avi->dv_demux, pkt);
830
        if (size >= 0)
831
            return size;
832
    }
833

    
834
    if(avi->non_interleaved){
835
        int best_stream_index = 0;
836
        AVStream *best_st= NULL;
837
        AVIStream *best_ast;
838
        int64_t best_ts= INT64_MAX;
839
        int i;
840

    
841
        for(i=0; i<s->nb_streams; i++){
842
            AVStream *st = s->streams[i];
843
            AVIStream *ast = st->priv_data;
844
            int64_t ts= ast->frame_offset;
845
            int64_t last_ts;
846

    
847
            if(!st->nb_index_entries)
848
                continue;
849

    
850
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
851
            if(!ast->remaining && ts > last_ts)
852
                continue;
853

    
854
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
855

    
856
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
857
            if(ts < best_ts){
858
                best_ts= ts;
859
                best_st= st;
860
                best_stream_index= i;
861
            }
862
        }
863
        if(!best_st)
864
            return -1;
865

    
866
        best_ast = best_st->priv_data;
867
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
868
        if(best_ast->remaining)
869
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
870
        else{
871
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
872
            if(i>=0)
873
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
874
        }
875

    
876
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
877
        if(i>=0){
878
            int64_t pos= best_st->index_entries[i].pos;
879
            pos += best_ast->packet_size - best_ast->remaining;
880
            url_fseek(s->pb, pos + 8, SEEK_SET);
881
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
882

    
883
            assert(best_ast->remaining <= best_ast->packet_size);
884

    
885
            avi->stream_index= best_stream_index;
886
            if(!best_ast->remaining)
887
                best_ast->packet_size=
888
                best_ast->remaining= best_st->index_entries[i].size;
889
        }
890
    }
891

    
892
resync:
893
    if(avi->stream_index >= 0){
894
        AVStream *st= s->streams[ avi->stream_index ];
895
        AVIStream *ast= st->priv_data;
896
        int size, err;
897

    
898
        if(get_subtitle_pkt(s, st, pkt))
899
            return 0;
900

    
901
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
902
            size= INT_MAX;
903
        else if(ast->sample_size < 32)
904
            // arbitrary multiplier to avoid tiny packets for raw PCM data
905
            size= 1024*ast->sample_size;
906
        else
907
            size= ast->sample_size;
908

    
909
        if(size > ast->remaining)
910
            size= ast->remaining;
911
        avi->last_pkt_pos= url_ftell(pb);
912
        err= av_get_packet(pb, pkt, size);
913
        if(err<0)
914
            return err;
915

    
916
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
917
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
918
            if(ptr){
919
            ast->has_pal=0;
920
            pkt->size += 4*256;
921
            pkt->data= ptr;
922
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
923
            }else
924
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
925
        }
926

    
927
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
928
            dstr = pkt->destruct;
929
            size = dv_produce_packet(avi->dv_demux, pkt,
930
                                    pkt->data, pkt->size);
931
            pkt->destruct = dstr;
932
            pkt->flags |= AV_PKT_FLAG_KEY;
933
            if (size < 0)
934
                av_free_packet(pkt);
935
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
936
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
937
            ast->frame_offset++;
938
            avi->stream_index = -1;
939
            ast->remaining = 0;
940
            goto resync;
941
        } else {
942
            /* XXX: How to handle B-frames in AVI? */
943
            pkt->dts = ast->frame_offset;
944
//                pkt->dts += ast->start;
945
            if(ast->sample_size)
946
                pkt->dts /= ast->sample_size;
947
//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);
948
            pkt->stream_index = avi->stream_index;
949

    
950
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
951
                AVIndexEntry *e;
952
                int index;
953
                assert(st->index_entries);
954

    
955
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
956
                e= &st->index_entries[index];
957

    
958
                if(index >= 0 && e->timestamp == ast->frame_offset){
959
                    if (e->flags & AVINDEX_KEYFRAME)
960
                        pkt->flags |= AV_PKT_FLAG_KEY;
961
                }
962
            } else {
963
                pkt->flags |= AV_PKT_FLAG_KEY;
964
            }
965
            ast->frame_offset += get_duration(ast, pkt->size);
966
        }
967
        ast->remaining -= size;
968
        if(!ast->remaining){
969
            avi->stream_index= -1;
970
            ast->packet_size= 0;
971
        }
972

    
973
        return size;
974
    }
975

    
976
    memset(d, -1, sizeof(int)*8);
977
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
978
        int j;
979

    
980
        for(j=0; j<7; j++)
981
            d[j]= d[j+1];
982
        d[7]= get_byte(pb);
983

    
984
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
985

    
986
        n= get_stream_idx(d+2);
987
//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);
988
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
989
            continue;
990

    
991
        //parse ix##
992
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
993
        //parse JUNK
994
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
995
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
996
            url_fskip(pb, size);
997
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
998
            goto resync;
999
        }
1000

    
1001
        //parse stray LIST
1002
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1003
            url_fskip(pb, 4);
1004
            goto resync;
1005
        }
1006

    
1007
        n= get_stream_idx(d);
1008

    
1009
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1010
            continue;
1011

    
1012
        //detect ##ix chunk and skip
1013
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1014
            url_fskip(pb, size);
1015
            goto resync;
1016
        }
1017

    
1018
        //parse ##dc/##wb
1019
        if(n < s->nb_streams){
1020
            AVStream *st;
1021
            AVIStream *ast;
1022
            st = s->streams[n];
1023
            ast = st->priv_data;
1024

    
1025
            if(s->nb_streams>=2){
1026
                AVStream *st1  = s->streams[1];
1027
                AVIStream *ast1= st1->priv_data;
1028
                //workaround for broken small-file-bug402.avi
1029
                if(   d[2] == 'w' && d[3] == 'b'
1030
                   && n==0
1031
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1032
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1033
                   && ast->prefix == 'd'*256+'c'
1034
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1035
                  ){
1036
                    n=1;
1037
                    st = st1;
1038
                    ast = ast1;
1039
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1040
                }
1041
            }
1042

    
1043

    
1044
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1045
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1046
               || st->discard >= AVDISCARD_ALL){
1047
                ast->frame_offset += get_duration(ast, size);
1048
                url_fskip(pb, size);
1049
                goto resync;
1050
            }
1051

    
1052
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1053
                int k = get_byte(pb);
1054
                int last = (k + get_byte(pb) - 1) & 0xFF;
1055

    
1056
                get_le16(pb); //flags
1057

    
1058
                for (; k <= last; k++)
1059
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
1060
                ast->has_pal= 1;
1061
                goto resync;
1062
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1063
                         d[2]*256+d[3] == ast->prefix /*||
1064
                         (d[2] == 'd' && d[3] == 'c') ||
1065
                         (d[2] == 'w' && d[3] == 'b')*/) {
1066

    
1067
//av_log(s, AV_LOG_DEBUG, "OK\n");
1068
                if(d[2]*256+d[3] == ast->prefix)
1069
                    ast->prefix_count++;
1070
                else{
1071
                    ast->prefix= d[2]*256+d[3];
1072
                    ast->prefix_count= 0;
1073
                }
1074

    
1075
                avi->stream_index= n;
1076
                ast->packet_size= size + 8;
1077
                ast->remaining= size;
1078

    
1079
                if(size || !ast->sample_size){
1080
                    uint64_t pos= url_ftell(pb) - 8;
1081
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1082
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1083
                    }
1084
                }
1085
                goto resync;
1086
            }
1087
        }
1088
    }
1089

    
1090
    return AVERROR_EOF;
1091
}
1092

    
1093
/* XXX: We make the implicit supposition that the positions are sorted
1094
   for each stream. */
1095
static int avi_read_idx1(AVFormatContext *s, int size)
1096
{
1097
    AVIContext *avi = s->priv_data;
1098
    ByteIOContext *pb = s->pb;
1099
    int nb_index_entries, i;
1100
    AVStream *st;
1101
    AVIStream *ast;
1102
    unsigned int index, tag, flags, pos, len;
1103
    unsigned last_pos= -1;
1104

    
1105
    nb_index_entries = size / 16;
1106
    if (nb_index_entries <= 0)
1107
        return -1;
1108

    
1109
    /* Read the entries and sort them in each stream component. */
1110
    for(i = 0; i < nb_index_entries; i++) {
1111
        tag = get_le32(pb);
1112
        flags = get_le32(pb);
1113
        pos = get_le32(pb);
1114
        len = get_le32(pb);
1115
#if defined(DEBUG_SEEK)
1116
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1117
               i, tag, flags, pos, len);
1118
#endif
1119
        if(i==0 && pos > avi->movi_list)
1120
            avi->movi_list= 0; //FIXME better check
1121
        pos += avi->movi_list;
1122

    
1123
        index = ((tag & 0xff) - '0') * 10;
1124
        index += ((tag >> 8) & 0xff) - '0';
1125
        if (index >= s->nb_streams)
1126
            continue;
1127
        st = s->streams[index];
1128
        ast = st->priv_data;
1129

    
1130
#if defined(DEBUG_SEEK)
1131
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1132
#endif
1133
        if(url_feof(pb))
1134
            return -1;
1135

    
1136
        if(last_pos == pos)
1137
            avi->non_interleaved= 1;
1138
        else if(len || !ast->sample_size)
1139
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1140
        ast->cum_len += get_duration(ast, len);
1141
        last_pos= pos;
1142
    }
1143
    return 0;
1144
}
1145

    
1146
static int guess_ni_flag(AVFormatContext *s){
1147
    int i;
1148
    int64_t last_start=0;
1149
    int64_t first_end= INT64_MAX;
1150
    int64_t oldpos= url_ftell(s->pb);
1151

    
1152
    for(i=0; i<s->nb_streams; i++){
1153
        AVStream *st = s->streams[i];
1154
        int n= st->nb_index_entries;
1155
        unsigned int size;
1156

    
1157
        if(n <= 0)
1158
            continue;
1159

    
1160
        if(n >= 2){
1161
            int64_t pos= st->index_entries[0].pos;
1162
            url_fseek(s->pb, pos + 4, SEEK_SET);
1163
            size= get_le32(s->pb);
1164
            if(pos + size > st->index_entries[1].pos)
1165
                last_start= INT64_MAX;
1166
        }
1167

    
1168
        if(st->index_entries[0].pos > last_start)
1169
            last_start= st->index_entries[0].pos;
1170
        if(st->index_entries[n-1].pos < first_end)
1171
            first_end= st->index_entries[n-1].pos;
1172
    }
1173
    url_fseek(s->pb, oldpos, SEEK_SET);
1174
    return last_start > first_end;
1175
}
1176

    
1177
static int avi_load_index(AVFormatContext *s)
1178
{
1179
    AVIContext *avi = s->priv_data;
1180
    ByteIOContext *pb = s->pb;
1181
    uint32_t tag, size;
1182
    int64_t pos= url_ftell(pb);
1183
    int ret = -1;
1184

    
1185
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1186
        goto the_end; // maybe truncated file
1187
#ifdef DEBUG_SEEK
1188
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1189
#endif
1190
    for(;;) {
1191
        if (url_feof(pb))
1192
            break;
1193
        tag = get_le32(pb);
1194
        size = get_le32(pb);
1195
#ifdef DEBUG_SEEK
1196
        printf("tag=%c%c%c%c size=0x%x\n",
1197
               tag & 0xff,
1198
               (tag >> 8) & 0xff,
1199
               (tag >> 16) & 0xff,
1200
               (tag >> 24) & 0xff,
1201
               size);
1202
#endif
1203
        switch(tag) {
1204
        case MKTAG('i', 'd', 'x', '1'):
1205
            if (avi_read_idx1(s, size) < 0)
1206
                goto skip;
1207
            ret = 0;
1208
                goto the_end;
1209
            break;
1210
        default:
1211
        skip:
1212
            size += (size & 1);
1213
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1214
                goto the_end; // something is wrong here
1215
            break;
1216
        }
1217
    }
1218
 the_end:
1219
    url_fseek(pb, pos, SEEK_SET);
1220
    return ret;
1221
}
1222

    
1223
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1224
{
1225
    AVIStream *ast2 = st2->priv_data;
1226
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1227
    av_free_packet(&ast2->sub_pkt);
1228
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1229
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1230
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1231
}
1232

    
1233
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1234
{
1235
    AVIContext *avi = s->priv_data;
1236
    AVStream *st;
1237
    int i, index;
1238
    int64_t pos;
1239
    AVIStream *ast;
1240

    
1241
    if (!avi->index_loaded) {
1242
        /* we only load the index on demand */
1243
        avi_load_index(s);
1244
        avi->index_loaded = 1;
1245
    }
1246
    assert(stream_index>= 0);
1247

    
1248
    st = s->streams[stream_index];
1249
    ast= st->priv_data;
1250
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1251
    if(index<0)
1252
        return -1;
1253

    
1254
    /* find the position */
1255
    pos = st->index_entries[index].pos;
1256
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1257

    
1258
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1259

    
1260
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1261
        /* One and only one real stream for DV in AVI, and it has video  */
1262
        /* offsets. Calling with other stream indexes should have failed */
1263
        /* the av_index_search_timestamp call above.                     */
1264
        assert(stream_index == 0);
1265

    
1266
        /* Feed the DV video stream version of the timestamp to the */
1267
        /* DV demux so it can synthesize correct timestamps.        */
1268
        dv_offset_reset(avi->dv_demux, timestamp);
1269

    
1270
        url_fseek(s->pb, pos, SEEK_SET);
1271
        avi->stream_index= -1;
1272
        return 0;
1273
    }
1274

    
1275
    for(i = 0; i < s->nb_streams; i++) {
1276
        AVStream *st2 = s->streams[i];
1277
        AVIStream *ast2 = st2->priv_data;
1278

    
1279
        ast2->packet_size=
1280
        ast2->remaining= 0;
1281

    
1282
        if (ast2->sub_ctx) {
1283
            seek_subtitle(st, st2, timestamp);
1284
            continue;
1285
        }
1286

    
1287
        if (st2->nb_index_entries <= 0)
1288
            continue;
1289

    
1290
//        assert(st2->codec->block_align);
1291
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1292
        index = av_index_search_timestamp(
1293
                st2,
1294
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1295
                flags | AVSEEK_FLAG_BACKWARD);
1296
        if(index<0)
1297
            index=0;
1298

    
1299
        if(!avi->non_interleaved){
1300
            while(index>0 && st2->index_entries[index].pos > pos)
1301
                index--;
1302
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1303
                index++;
1304
        }
1305

    
1306
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1307
        /* extract the current frame number */
1308
        ast2->frame_offset = st2->index_entries[index].timestamp;
1309
    }
1310

    
1311
    /* do the seek */
1312
    url_fseek(s->pb, pos, SEEK_SET);
1313
    avi->stream_index= -1;
1314
    return 0;
1315
}
1316

    
1317
static int avi_read_close(AVFormatContext *s)
1318
{
1319
    int i;
1320
    AVIContext *avi = s->priv_data;
1321

    
1322
    for(i=0;i<s->nb_streams;i++) {
1323
        AVStream *st = s->streams[i];
1324
        AVIStream *ast = st->priv_data;
1325
        av_free(st->codec->palctrl);
1326
        if (ast) {
1327
            if (ast->sub_ctx) {
1328
                av_freep(&ast->sub_ctx->pb);
1329
                av_close_input_stream(ast->sub_ctx);
1330
            }
1331
            av_free(ast->sub_buffer);
1332
            av_free_packet(&ast->sub_pkt);
1333
        }
1334
    }
1335

    
1336
    if (avi->dv_demux)
1337
        av_free(avi->dv_demux);
1338

    
1339
    return 0;
1340
}
1341

    
1342
static int avi_probe(AVProbeData *p)
1343
{
1344
    int i;
1345

    
1346
    /* check file header */
1347
    for(i=0; avi_headers[i][0]; i++)
1348
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1349
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1350
            return AVPROBE_SCORE_MAX;
1351

    
1352
    return 0;
1353
}
1354

    
1355
AVInputFormat avi_demuxer = {
1356
    "avi",
1357
    NULL_IF_CONFIG_SMALL("AVI format"),
1358
    sizeof(AVIContext),
1359
    avi_probe,
1360
    avi_read_header,
1361
    avi_read_packet,
1362
    avi_read_close,
1363
    avi_read_seek,
1364
};