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ffmpeg / libavformat / avidec.c @ f138fa78

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

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

    
25
#include "libavutil/intreadwrite.h"
26
#include "libavutil/bswap.h"
27
#include "libavcodec/bytestream.h"
28
#include "avformat.h"
29
#include "avi.h"
30
#include "dv.h"
31
#include "riff.h"
32

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

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

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

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

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

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

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

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

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

    
86
#ifdef DEBUG
87
static void print_tag(const char *str, unsigned int tag, int size)
88
{
89
    dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
90
           str, tag & 0xff,
91
           (tag >> 8) & 0xff,
92
           (tag >> 16) & 0xff,
93
           (tag >> 24) & 0xff,
94
           size);
95
}
96
#endif
97

    
98
static inline int get_duration(AVIStream *ast, int len){
99
    if(ast->sample_size){
100
        return len;
101
    }else if (ast->dshow_block_align){
102
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
103
    }else
104
        return 1;
105
}
106

    
107
static int get_riff(AVFormatContext *s, ByteIOContext *pb)
108
{
109
    AVIContext *avi = s->priv_data;
110
    char header[8];
111
    int i;
112

    
113
    /* check RIFF header */
114
    get_buffer(pb, header, 4);
115
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
116
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
117
    get_buffer(pb, header+4, 4);
118

    
119
    for(i=0; avi_headers[i][0]; i++)
120
        if(!memcmp(header, avi_headers[i], 8))
121
            break;
122
    if(!avi_headers[i][0])
123
        return -1;
124

    
125
    if(header[7] == 0x19)
126
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
127

    
128
    return 0;
129
}
130

    
131
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
132
    AVIContext *avi = s->priv_data;
133
    ByteIOContext *pb = s->pb;
134
    int longs_pre_entry= get_le16(pb);
135
    int index_sub_type = get_byte(pb);
136
    int index_type     = get_byte(pb);
137
    int entries_in_use = get_le32(pb);
138
    int chunk_id       = get_le32(pb);
139
    int64_t base       = get_le64(pb);
140
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
141
    AVStream *st;
142
    AVIStream *ast;
143
    int i;
144
    int64_t last_pos= -1;
145
    int64_t filesize= url_fsize(s->pb);
146

    
147
#ifdef DEBUG_SEEK
148
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
149
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
150
#endif
151

    
152
    if(stream_id >= s->nb_streams || stream_id < 0)
153
        return -1;
154
    st= s->streams[stream_id];
155
    ast = st->priv_data;
156

    
157
    if(index_sub_type)
158
        return -1;
159

    
160
    get_le32(pb);
161

    
162
    if(index_type && longs_pre_entry != 2)
163
        return -1;
164
    if(index_type>1)
165
        return -1;
166

    
167
    if(filesize > 0 && base >= filesize){
168
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
169
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
170
            base &= 0xFFFFFFFF;
171
        else
172
            return -1;
173
    }
174

    
175
    for(i=0; i<entries_in_use; i++){
176
        if(index_type){
177
            int64_t pos= get_le32(pb) + base - 8;
178
            int len    = get_le32(pb);
179
            int key= len >= 0;
180
            len &= 0x7FFFFFFF;
181

    
182
#ifdef DEBUG_SEEK
183
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
184
#endif
185
            if(url_feof(pb))
186
                return -1;
187

    
188
            if(last_pos == pos || pos == base - 8)
189
                avi->non_interleaved= 1;
190
            if(last_pos != pos && (len || !ast->sample_size))
191
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
192

    
193
            ast->cum_len += get_duration(ast, len);
194
            last_pos= pos;
195
        }else{
196
            int64_t offset, pos;
197
            int duration;
198
            offset = get_le64(pb);
199
            get_le32(pb);       /* size */
200
            duration = get_le32(pb);
201

    
202
            if(url_feof(pb))
203
                return -1;
204

    
205
            pos = url_ftell(pb);
206

    
207
            if(avi->odml_depth > MAX_ODML_DEPTH){
208
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
209
                return -1;
210
            }
211

    
212
            url_fseek(pb, offset+8, SEEK_SET);
213
            avi->odml_depth++;
214
            read_braindead_odml_indx(s, frame_num);
215
            avi->odml_depth--;
216
            frame_num += duration;
217

    
218
            url_fseek(pb, pos, SEEK_SET);
219
        }
220
    }
221
    avi->index_loaded=1;
222
    return 0;
223
}
224

    
225
static void clean_index(AVFormatContext *s){
226
    int i;
227
    int64_t j;
228

    
229
    for(i=0; i<s->nb_streams; i++){
230
        AVStream *st = s->streams[i];
231
        AVIStream *ast = st->priv_data;
232
        int n= st->nb_index_entries;
233
        int max= ast->sample_size;
234
        int64_t pos, size, ts;
235

    
236
        if(n != 1 || ast->sample_size==0)
237
            continue;
238

    
239
        while(max < 1024) max+=max;
240

    
241
        pos= st->index_entries[0].pos;
242
        size= st->index_entries[0].size;
243
        ts= st->index_entries[0].timestamp;
244

    
245
        for(j=0; j<size; j+=max){
246
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
247
        }
248
    }
249
}
250

    
251
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
252
{
253
    ByteIOContext *pb = s->pb;
254
    char key[5] = {0}, *value;
255

    
256
    size += (size & 1);
257

    
258
    if (size == UINT_MAX)
259
        return -1;
260
    value = av_malloc(size+1);
261
    if (!value)
262
        return -1;
263
    get_buffer(pb, value, size);
264
    value[size]=0;
265

    
266
    AV_WL32(key, tag);
267

    
268
    if(st)
269
        return av_metadata_set2(&st->metadata, key, value,
270
                                    AV_METADATA_DONT_STRDUP_VAL);
271
    else
272
    return av_metadata_set2(&s->metadata, key, value,
273
                                  AV_METADATA_DONT_STRDUP_VAL);
274
}
275

    
276
static void avi_read_info(AVFormatContext *s, uint64_t end)
277
{
278
    while (url_ftell(s->pb) < end) {
279
        uint32_t tag  = get_le32(s->pb);
280
        uint32_t size = get_le32(s->pb);
281
        avi_read_tag(s, NULL, tag, size);
282
    }
283
}
284

    
285
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
286
{
287
    AVIContext *avi = s->priv_data;
288
    ByteIOContext *pb = s->pb;
289
    unsigned int tag, tag1, handler;
290
    int codec_type, stream_index, frame_period, bit_rate;
291
    unsigned int size;
292
    int i;
293
    AVStream *st;
294
    AVIStream *ast = NULL;
295
    int avih_width=0, avih_height=0;
296
    int amv_file_format=0;
297
    uint64_t list_end = 0;
298

    
299
    avi->stream_index= -1;
300

    
301
    if (get_riff(s, pb) < 0)
302
        return -1;
303

    
304
    avi->fsize = url_fsize(pb);
305
    if(avi->fsize<=0)
306
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
307

    
308
    /* first list tag */
309
    stream_index = -1;
310
    codec_type = -1;
311
    frame_period = 0;
312
    for(;;) {
313
        if (url_feof(pb))
314
            goto fail;
315
        tag = get_le32(pb);
316
        size = get_le32(pb);
317
#ifdef DEBUG
318
        print_tag("tag", tag, size);
319
#endif
320

    
321
        switch(tag) {
322
        case MKTAG('L', 'I', 'S', 'T'):
323
            list_end = url_ftell(pb) + size;
324
            /* Ignored, except at start of video packets. */
325
            tag1 = get_le32(pb);
326
#ifdef DEBUG
327
            print_tag("list", tag1, 0);
328
#endif
329
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
330
                avi->movi_list = url_ftell(pb) - 4;
331
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
332
                else     avi->movi_end = url_fsize(pb);
333
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
334
                goto end_of_header;
335
            }
336
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
337
                avi_read_info(s, list_end);
338

    
339
            break;
340
        case MKTAG('d', 'm', 'l', 'h'):
341
            avi->is_odml = 1;
342
            url_fskip(pb, size + (size & 1));
343
            break;
344
        case MKTAG('a', 'm', 'v', 'h'):
345
            amv_file_format=1;
346
        case MKTAG('a', 'v', 'i', 'h'):
347
            /* AVI header */
348
            /* using frame_period is bad idea */
349
            frame_period = get_le32(pb);
350
            bit_rate = get_le32(pb) * 8;
351
            get_le32(pb);
352
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
353

    
354
            url_fskip(pb, 2 * 4);
355
            get_le32(pb);
356
            get_le32(pb);
357
            avih_width=get_le32(pb);
358
            avih_height=get_le32(pb);
359

    
360
            url_fskip(pb, size - 10 * 4);
361
            break;
362
        case MKTAG('s', 't', 'r', 'h'):
363
            /* stream header */
364

    
365
            tag1 = get_le32(pb);
366
            handler = get_le32(pb); /* codec tag */
367

    
368
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
369
                url_fskip(pb, size - 8);
370
                break;
371
            }else{
372
                stream_index++;
373
                st = av_new_stream(s, stream_index);
374
                if (!st)
375
                    goto fail;
376

    
377
                ast = av_mallocz(sizeof(AVIStream));
378
                if (!ast)
379
                    goto fail;
380
                st->priv_data = ast;
381
            }
382
            if(amv_file_format)
383
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
384

    
385
#ifdef DEBUG
386
            print_tag("strh", tag1, -1);
387
#endif
388
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
389
                int64_t dv_dur;
390

    
391
                /*
392
                 * After some consideration -- I don't think we
393
                 * have to support anything but DV in type1 AVIs.
394
                 */
395
                if (s->nb_streams != 1)
396
                    goto fail;
397

    
398
                if (handler != MKTAG('d', 'v', 's', 'd') &&
399
                    handler != MKTAG('d', 'v', 'h', 'd') &&
400
                    handler != MKTAG('d', 'v', 's', 'l'))
401
                   goto fail;
402

    
403
                ast = s->streams[0]->priv_data;
404
                av_freep(&s->streams[0]->codec->extradata);
405
                av_freep(&s->streams[0]->codec);
406
                av_freep(&s->streams[0]);
407
                s->nb_streams = 0;
408
                if (CONFIG_DV_DEMUXER) {
409
                    avi->dv_demux = dv_init_demux(s);
410
                    if (!avi->dv_demux)
411
                        goto fail;
412
                }
413
                s->streams[0]->priv_data = ast;
414
                url_fskip(pb, 3 * 4);
415
                ast->scale = get_le32(pb);
416
                ast->rate = get_le32(pb);
417
                url_fskip(pb, 4);  /* start time */
418

    
419
                dv_dur = get_le32(pb);
420
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
421
                    dv_dur *= AV_TIME_BASE;
422
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
423
                }
424
                /*
425
                 * else, leave duration alone; timing estimation in utils.c
426
                 *      will make a guess based on bitrate.
427
                 */
428

    
429
                stream_index = s->nb_streams - 1;
430
                url_fskip(pb, size - 9*4);
431
                break;
432
            }
433

    
434
            assert(stream_index < s->nb_streams);
435
            st->codec->stream_codec_tag= handler;
436

    
437
            get_le32(pb); /* flags */
438
            get_le16(pb); /* priority */
439
            get_le16(pb); /* language */
440
            get_le32(pb); /* initial frame */
441
            ast->scale = get_le32(pb);
442
            ast->rate = get_le32(pb);
443
            if(!(ast->scale && ast->rate)){
444
                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);
445
                if(frame_period){
446
                    ast->rate = 1000000;
447
                    ast->scale = frame_period;
448
                }else{
449
                    ast->rate = 25;
450
                    ast->scale = 1;
451
                }
452
            }
453
            av_set_pts_info(st, 64, ast->scale, ast->rate);
454

    
455
            ast->cum_len=get_le32(pb); /* start */
456
            st->nb_frames = get_le32(pb);
457

    
458
            st->start_time = 0;
459
            get_le32(pb); /* buffer size */
460
            get_le32(pb); /* quality */
461
            ast->sample_size = get_le32(pb); /* sample ssize */
462
            ast->cum_len *= FFMAX(1, ast->sample_size);
463
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
464

    
465
            switch(tag1) {
466
            case MKTAG('v', 'i', 'd', 's'):
467
                codec_type = AVMEDIA_TYPE_VIDEO;
468

    
469
                ast->sample_size = 0;
470
                break;
471
            case MKTAG('a', 'u', 'd', 's'):
472
                codec_type = AVMEDIA_TYPE_AUDIO;
473
                break;
474
            case MKTAG('t', 'x', 't', 's'):
475
                codec_type = AVMEDIA_TYPE_SUBTITLE;
476
                break;
477
            case MKTAG('d', 'a', 't', 's'):
478
                codec_type = AVMEDIA_TYPE_DATA;
479
                break;
480
            default:
481
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
482
                goto fail;
483
            }
484
            if(ast->sample_size == 0)
485
                st->duration = st->nb_frames;
486
            ast->frame_offset= ast->cum_len;
487
            url_fskip(pb, size - 12 * 4);
488
            break;
489
        case MKTAG('s', 't', 'r', 'f'):
490
            /* stream header */
491
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
492
                url_fskip(pb, size);
493
            } else {
494
                uint64_t cur_pos = url_ftell(pb);
495
                if (cur_pos < list_end)
496
                    size = FFMIN(size, list_end - cur_pos);
497
                st = s->streams[stream_index];
498
                switch(codec_type) {
499
                case AVMEDIA_TYPE_VIDEO:
500
                    if(amv_file_format){
501
                        st->codec->width=avih_width;
502
                        st->codec->height=avih_height;
503
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
504
                        st->codec->codec_id = CODEC_ID_AMV;
505
                        url_fskip(pb, size);
506
                        break;
507
                    }
508
                    get_le32(pb); /* size */
509
                    st->codec->width = get_le32(pb);
510
                    st->codec->height = (int32_t)get_le32(pb);
511
                    get_le16(pb); /* panes */
512
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
513
                    tag1 = get_le32(pb);
514
                    get_le32(pb); /* ImageSize */
515
                    get_le32(pb); /* XPelsPerMeter */
516
                    get_le32(pb); /* YPelsPerMeter */
517
                    get_le32(pb); /* ClrUsed */
518
                    get_le32(pb); /* ClrImportant */
519

    
520
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
521
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
522
                        st->codec->codec_tag = tag1;
523
                        st->codec->codec_id = CODEC_ID_XSUB;
524
                        break;
525
                    }
526

    
527
                    if(size > 10*4 && size<(1<<30)){
528
                        st->codec->extradata_size= size - 10*4;
529
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
530
                        if (!st->codec->extradata) {
531
                            st->codec->extradata_size= 0;
532
                            return AVERROR(ENOMEM);
533
                        }
534
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
535
                    }
536

    
537
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
538
                        get_byte(pb);
539

    
540
                    /* Extract palette from extradata if bpp <= 8. */
541
                    /* This code assumes that extradata contains only palette. */
542
                    /* This is true for all paletted codecs implemented in FFmpeg. */
543
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
544
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
545
#if HAVE_BIGENDIAN
546
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
547
                            st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
548
#else
549
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
550
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
551
#endif
552
                        st->codec->palctrl->palette_changed = 1;
553
                    }
554

    
555
#ifdef DEBUG
556
                    print_tag("video", tag1, 0);
557
#endif
558
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
559
                    st->codec->codec_tag = tag1;
560
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
561
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
562
                    // Support "Resolution 1:1" for Avid AVI Codec
563
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
564
                       st->codec->extradata_size >= 31 &&
565
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
566
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
567

    
568
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
569
                        st->codec->extradata_size+= 9;
570
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
571
                        if(st->codec->extradata)
572
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
573
                    }
574
                    st->codec->height= FFABS(st->codec->height);
575

    
576
//                    url_fskip(pb, size - 5 * 4);
577
                    break;
578
                case AVMEDIA_TYPE_AUDIO:
579
                    ff_get_wav_header(pb, st->codec, size);
580
                    ast->dshow_block_align= st->codec->block_align;
581
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
582
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
583
                        ast->sample_size= st->codec->block_align;
584
                    }
585
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
586
                        url_fskip(pb, 1);
587
                    /* Force parsing as several audio frames can be in
588
                     * one packet and timestamps refer to packet start. */
589
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
590
                    /* ADTS header is in extradata, AAC without header must be
591
                     * stored as exact frames. Parser not needed and it will
592
                     * fail. */
593
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
594
                        st->need_parsing = AVSTREAM_PARSE_NONE;
595
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
596
                     * audio in the header but have Axan as stream_code_tag. */
597
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
598
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
599
                        st->codec->codec_tag = 0;
600
                    }
601
                    if (amv_file_format){
602
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
603
                        ast->dshow_block_align = 0;
604
                    }
605
                    break;
606
                case AVMEDIA_TYPE_SUBTITLE:
607
                    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
608
                    st->codec->codec_id   = CODEC_ID_PROBE;
609
                    break;
610
                default:
611
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
612
                    st->codec->codec_id= CODEC_ID_NONE;
613
                    st->codec->codec_tag= 0;
614
                    url_fskip(pb, size);
615
                    break;
616
                }
617
            }
618
            break;
619
        case MKTAG('i', 'n', 'd', 'x'):
620
            i= url_ftell(pb);
621
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
622
                read_braindead_odml_indx(s, 0);
623
            }
624
            url_fseek(pb, i+size, SEEK_SET);
625
            break;
626
        case MKTAG('v', 'p', 'r', 'p'):
627
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
628
                AVRational active, active_aspect;
629

    
630
                st = s->streams[stream_index];
631
                get_le32(pb);
632
                get_le32(pb);
633
                get_le32(pb);
634
                get_le32(pb);
635
                get_le32(pb);
636

    
637
                active_aspect.den= get_le16(pb);
638
                active_aspect.num= get_le16(pb);
639
                active.num       = get_le32(pb);
640
                active.den       = get_le32(pb);
641
                get_le32(pb); //nbFieldsPerFrame
642

    
643
                if(active_aspect.num && active_aspect.den && active.num && active.den){
644
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
645
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
646
                }
647
                size -= 9*4;
648
            }
649
            url_fseek(pb, size, SEEK_CUR);
650
            break;
651
        case MKTAG('s', 't', 'r', 'n'):
652
            if(s->nb_streams){
653
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
654
                break;
655
            }
656
        default:
657
            if(size > 1000000){
658
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
659
                                        "I will ignore it and try to continue anyway.\n");
660
                avi->movi_list = url_ftell(pb) - 4;
661
                avi->movi_end  = url_fsize(pb);
662
                goto end_of_header;
663
            }
664
            /* skip tag */
665
            size += (size & 1);
666
            url_fskip(pb, size);
667
            break;
668
        }
669
    }
670
 end_of_header:
671
    /* check stream number */
672
    if (stream_index != s->nb_streams - 1) {
673
    fail:
674
        return -1;
675
    }
676

    
677
    if(!avi->index_loaded && !url_is_streamed(pb))
678
        avi_load_index(s);
679
    avi->index_loaded = 1;
680
    avi->non_interleaved |= guess_ni_flag(s);
681
    for(i=0; i<s->nb_streams; i++){
682
        AVStream *st = s->streams[i];
683
        if(st->nb_index_entries)
684
            break;
685
    }
686
    if(i==s->nb_streams && avi->non_interleaved) {
687
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
688
        avi->non_interleaved=0;
689
    }
690

    
691
    if(avi->non_interleaved) {
692
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
693
        clean_index(s);
694
    }
695

    
696
    return 0;
697
}
698

    
699
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
700
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
701
        uint8_t desc[256], *d = desc;
702
        uint8_t *end, *ptr = pkt->data+7;
703
        unsigned int size, desc_len = bytestream_get_le32(&ptr);
704
        int score = AVPROBE_SCORE_MAX / 2;
705
        AVIStream *ast = st->priv_data;
706
        AVInputFormat *sub_demuxer;
707
        AVRational time_base;
708
        ByteIOContext *pb;
709
        AVProbeData pd;
710

    
711
        if (desc_len > FFMAX(pkt->size-17, 0))
712
            return 0;
713

    
714
        end = ptr + desc_len;
715
        while (ptr < end-1) {
716
            uint8_t tmp;
717
            uint32_t ch;
718
            GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);
719
            PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1)  *d++ = tmp;);
720
        }
721
        *d = 0;
722
        if (*desc)
723
            av_metadata_set2(&st->metadata, "title", desc, 0);
724

    
725
        ptr = end + 2;
726
        size = bytestream_get_le32(&ptr);
727
        size = FFMIN(size, pkt->size+pkt->data-ptr);
728

    
729
        pd = (AVProbeData) { .buf = ptr, .buf_size = size };
730
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
731
            return 0;
732

    
733
        pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);
734
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
735
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
736
            *st->codec = *ast->sub_ctx->streams[0]->codec;
737
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
738
            time_base = ast->sub_ctx->streams[0]->time_base;
739
            av_set_pts_info(st, 64, time_base.num, time_base.den);
740
        }
741
        ast->sub_buffer = pkt->data;
742
        memset(pkt, 0, sizeof(*pkt));
743
        return 1;
744
    }
745
    return 0;
746
}
747

    
748
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
749
                                  AVPacket *pkt)
750
{
751
    AVIStream *ast, *next_ast = next_st->priv_data;
752
    int64_t ts, next_ts, ts_min = INT64_MAX;
753
    AVStream *st, *sub_st = NULL;
754
    int i;
755

    
756
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
757
                           AV_TIME_BASE_Q);
758

    
759
    for (i=0; i<s->nb_streams; i++) {
760
        st  = s->streams[i];
761
        ast = st->priv_data;
762
        if (st->discard < AVDISCARD_ALL && ast->sub_pkt.data) {
763
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
764
            if (ts <= next_ts && ts < ts_min) {
765
                ts_min = ts;
766
                sub_st = st;
767
            }
768
        }
769
    }
770

    
771
    if (sub_st) {
772
        ast = sub_st->priv_data;
773
        *pkt = ast->sub_pkt;
774
        pkt->stream_index = sub_st->index;
775
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
776
            ast->sub_pkt.data = NULL;
777
    }
778
    return sub_st;
779
}
780

    
781
static int get_stream_idx(int *d){
782
    if(    d[0] >= '0' && d[0] <= '9'
783
        && d[1] >= '0' && d[1] <= '9'){
784
        return (d[0] - '0') * 10 + (d[1] - '0');
785
    }else{
786
        return 100; //invalid stream ID
787
    }
788
}
789

    
790
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
791
{
792
    AVIContext *avi = s->priv_data;
793
    ByteIOContext *pb = s->pb;
794
    int n, d[8];
795
    unsigned int size;
796
    int64_t i, sync;
797
    void* dstr;
798

    
799
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
800
        int size = dv_get_packet(avi->dv_demux, pkt);
801
        if (size >= 0)
802
            return size;
803
    }
804

    
805
    if(avi->non_interleaved){
806
        int best_stream_index = 0;
807
        AVStream *best_st= NULL;
808
        AVIStream *best_ast;
809
        int64_t best_ts= INT64_MAX;
810
        int i;
811

    
812
        for(i=0; i<s->nb_streams; i++){
813
            AVStream *st = s->streams[i];
814
            AVIStream *ast = st->priv_data;
815
            int64_t ts= ast->frame_offset;
816
            int64_t last_ts;
817

    
818
            if(!st->nb_index_entries)
819
                continue;
820

    
821
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
822
            if(!ast->remaining && ts > last_ts)
823
                continue;
824

    
825
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
826

    
827
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
828
            if(ts < best_ts){
829
                best_ts= ts;
830
                best_st= st;
831
                best_stream_index= i;
832
            }
833
        }
834
        if(!best_st)
835
            return -1;
836

    
837
        best_ast = best_st->priv_data;
838
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
839
        if(best_ast->remaining)
840
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
841
        else{
842
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
843
            if(i>=0)
844
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
845
        }
846

    
847
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
848
        if(i>=0){
849
            int64_t pos= best_st->index_entries[i].pos;
850
            pos += best_ast->packet_size - best_ast->remaining;
851
            url_fseek(s->pb, pos + 8, SEEK_SET);
852
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
853

    
854
            assert(best_ast->remaining <= best_ast->packet_size);
855

    
856
            avi->stream_index= best_stream_index;
857
            if(!best_ast->remaining)
858
                best_ast->packet_size=
859
                best_ast->remaining= best_st->index_entries[i].size;
860
        }
861
    }
862

    
863
resync:
864
    if(avi->stream_index >= 0){
865
        AVStream *st= s->streams[ avi->stream_index ];
866
        AVIStream *ast= st->priv_data;
867
        int size, err;
868

    
869
        if(get_subtitle_pkt(s, st, pkt))
870
            return 0;
871

    
872
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
873
            size= INT_MAX;
874
        else if(ast->sample_size < 32)
875
            // arbitrary multiplier to avoid tiny packets for raw PCM data
876
            size= 1024*ast->sample_size;
877
        else
878
            size= ast->sample_size;
879

    
880
        if(size > ast->remaining)
881
            size= ast->remaining;
882
        avi->last_pkt_pos= url_ftell(pb);
883
        err= av_get_packet(pb, pkt, size);
884
        if(err<0)
885
            return err;
886

    
887
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
888
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
889
            if(ptr){
890
            ast->has_pal=0;
891
            pkt->size += 4*256;
892
            pkt->data= ptr;
893
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
894
            }else
895
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
896
        }
897

    
898
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
899
            dstr = pkt->destruct;
900
            size = dv_produce_packet(avi->dv_demux, pkt,
901
                                    pkt->data, pkt->size);
902
            pkt->destruct = dstr;
903
            pkt->flags |= AV_PKT_FLAG_KEY;
904
            if (size < 0)
905
                av_free_packet(pkt);
906
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
907
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
908
            ast->frame_offset++;
909
            avi->stream_index = -1;
910
            ast->remaining = 0;
911
            goto resync;
912
        } else {
913
            /* XXX: How to handle B-frames in AVI? */
914
            pkt->dts = ast->frame_offset;
915
//                pkt->dts += ast->start;
916
            if(ast->sample_size)
917
                pkt->dts /= ast->sample_size;
918
//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);
919
            pkt->stream_index = avi->stream_index;
920

    
921
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
922
                AVIndexEntry *e;
923
                int index;
924
                assert(st->index_entries);
925

    
926
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
927
                e= &st->index_entries[index];
928

    
929
                if(index >= 0 && e->timestamp == ast->frame_offset){
930
                    if (e->flags & AVINDEX_KEYFRAME)
931
                        pkt->flags |= AV_PKT_FLAG_KEY;
932
                }
933
            } else {
934
                pkt->flags |= AV_PKT_FLAG_KEY;
935
            }
936
            ast->frame_offset += get_duration(ast, pkt->size);
937
        }
938
        ast->remaining -= size;
939
        if(!ast->remaining){
940
            avi->stream_index= -1;
941
            ast->packet_size= 0;
942
        }
943

    
944
        return size;
945
    }
946

    
947
    memset(d, -1, sizeof(int)*8);
948
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
949
        int j;
950

    
951
        for(j=0; j<7; j++)
952
            d[j]= d[j+1];
953
        d[7]= get_byte(pb);
954

    
955
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
956

    
957
        n= get_stream_idx(d+2);
958
//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);
959
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
960
            continue;
961

    
962
        //parse ix##
963
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
964
        //parse JUNK
965
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
966
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
967
            url_fskip(pb, size);
968
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
969
            goto resync;
970
        }
971

    
972
        //parse stray LIST
973
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
974
            url_fskip(pb, 4);
975
            goto resync;
976
        }
977

    
978
        n= get_stream_idx(d);
979

    
980
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
981
            continue;
982

    
983
        //detect ##ix chunk and skip
984
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
985
            url_fskip(pb, size);
986
            goto resync;
987
        }
988

    
989
        //parse ##dc/##wb
990
        if(n < s->nb_streams){
991
            AVStream *st;
992
            AVIStream *ast;
993
            st = s->streams[n];
994
            ast = st->priv_data;
995

    
996
            if(s->nb_streams>=2){
997
                AVStream *st1  = s->streams[1];
998
                AVIStream *ast1= st1->priv_data;
999
                //workaround for broken small-file-bug402.avi
1000
                if(   d[2] == 'w' && d[3] == 'b'
1001
                   && n==0
1002
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1003
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1004
                   && ast->prefix == 'd'*256+'c'
1005
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1006
                  ){
1007
                    n=1;
1008
                    st = st1;
1009
                    ast = ast1;
1010
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1011
                }
1012
            }
1013

    
1014

    
1015
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1016
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1017
               || st->discard >= AVDISCARD_ALL){
1018
                ast->frame_offset += get_duration(ast, size);
1019
                url_fskip(pb, size);
1020
                goto resync;
1021
            }
1022

    
1023
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1024
                int k = get_byte(pb);
1025
                int last = (k + get_byte(pb) - 1) & 0xFF;
1026

    
1027
                get_le16(pb); //flags
1028

    
1029
                for (; k <= last; k++)
1030
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
1031
                ast->has_pal= 1;
1032
                goto resync;
1033
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1034
                         d[2]*256+d[3] == ast->prefix /*||
1035
                         (d[2] == 'd' && d[3] == 'c') ||
1036
                         (d[2] == 'w' && d[3] == 'b')*/) {
1037

    
1038
//av_log(s, AV_LOG_DEBUG, "OK\n");
1039
                if(d[2]*256+d[3] == ast->prefix)
1040
                    ast->prefix_count++;
1041
                else{
1042
                    ast->prefix= d[2]*256+d[3];
1043
                    ast->prefix_count= 0;
1044
                }
1045

    
1046
                avi->stream_index= n;
1047
                ast->packet_size= size + 8;
1048
                ast->remaining= size;
1049

    
1050
                if(size || !ast->sample_size){
1051
                    uint64_t pos= url_ftell(pb) - 8;
1052
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1053
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1054
                    }
1055
                }
1056
                goto resync;
1057
            }
1058
        }
1059
    }
1060

    
1061
    return AVERROR_EOF;
1062
}
1063

    
1064
/* XXX: We make the implicit supposition that the positions are sorted
1065
   for each stream. */
1066
static int avi_read_idx1(AVFormatContext *s, int size)
1067
{
1068
    AVIContext *avi = s->priv_data;
1069
    ByteIOContext *pb = s->pb;
1070
    int nb_index_entries, i;
1071
    AVStream *st;
1072
    AVIStream *ast;
1073
    unsigned int index, tag, flags, pos, len;
1074
    unsigned last_pos= -1;
1075

    
1076
    nb_index_entries = size / 16;
1077
    if (nb_index_entries <= 0)
1078
        return -1;
1079

    
1080
    /* Read the entries and sort them in each stream component. */
1081
    for(i = 0; i < nb_index_entries; i++) {
1082
        tag = get_le32(pb);
1083
        flags = get_le32(pb);
1084
        pos = get_le32(pb);
1085
        len = get_le32(pb);
1086
#if defined(DEBUG_SEEK)
1087
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1088
               i, tag, flags, pos, len);
1089
#endif
1090
        if(i==0 && pos > avi->movi_list)
1091
            avi->movi_list= 0; //FIXME better check
1092
        pos += avi->movi_list;
1093

    
1094
        index = ((tag & 0xff) - '0') * 10;
1095
        index += ((tag >> 8) & 0xff) - '0';
1096
        if (index >= s->nb_streams)
1097
            continue;
1098
        st = s->streams[index];
1099
        ast = st->priv_data;
1100

    
1101
#if defined(DEBUG_SEEK)
1102
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1103
#endif
1104
        if(url_feof(pb))
1105
            return -1;
1106

    
1107
        if(last_pos == pos)
1108
            avi->non_interleaved= 1;
1109
        else if(len || !ast->sample_size)
1110
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1111
        ast->cum_len += get_duration(ast, len);
1112
        last_pos= pos;
1113
    }
1114
    return 0;
1115
}
1116

    
1117
static int guess_ni_flag(AVFormatContext *s){
1118
    int i;
1119
    int64_t last_start=0;
1120
    int64_t first_end= INT64_MAX;
1121
    int64_t oldpos= url_ftell(s->pb);
1122

    
1123
    for(i=0; i<s->nb_streams; i++){
1124
        AVStream *st = s->streams[i];
1125
        int n= st->nb_index_entries;
1126
        unsigned int size;
1127

    
1128
        if(n <= 0)
1129
            continue;
1130

    
1131
        if(n >= 2){
1132
            int64_t pos= st->index_entries[0].pos;
1133
            url_fseek(s->pb, pos + 4, SEEK_SET);
1134
            size= get_le32(s->pb);
1135
            if(pos + size > st->index_entries[1].pos)
1136
                last_start= INT64_MAX;
1137
        }
1138

    
1139
        if(st->index_entries[0].pos > last_start)
1140
            last_start= st->index_entries[0].pos;
1141
        if(st->index_entries[n-1].pos < first_end)
1142
            first_end= st->index_entries[n-1].pos;
1143
    }
1144
    url_fseek(s->pb, oldpos, SEEK_SET);
1145
    return last_start > first_end;
1146
}
1147

    
1148
static int avi_load_index(AVFormatContext *s)
1149
{
1150
    AVIContext *avi = s->priv_data;
1151
    ByteIOContext *pb = s->pb;
1152
    uint32_t tag, size;
1153
    int64_t pos= url_ftell(pb);
1154
    int ret = -1;
1155

    
1156
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1157
        goto the_end; // maybe truncated file
1158
#ifdef DEBUG_SEEK
1159
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1160
#endif
1161
    for(;;) {
1162
        if (url_feof(pb))
1163
            break;
1164
        tag = get_le32(pb);
1165
        size = get_le32(pb);
1166
#ifdef DEBUG_SEEK
1167
        printf("tag=%c%c%c%c size=0x%x\n",
1168
               tag & 0xff,
1169
               (tag >> 8) & 0xff,
1170
               (tag >> 16) & 0xff,
1171
               (tag >> 24) & 0xff,
1172
               size);
1173
#endif
1174
        switch(tag) {
1175
        case MKTAG('i', 'd', 'x', '1'):
1176
            if (avi_read_idx1(s, size) < 0)
1177
                goto skip;
1178
            ret = 0;
1179
                goto the_end;
1180
            break;
1181
        default:
1182
        skip:
1183
            size += (size & 1);
1184
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1185
                goto the_end; // something is wrong here
1186
            break;
1187
        }
1188
    }
1189
 the_end:
1190
    url_fseek(pb, pos, SEEK_SET);
1191
    return ret;
1192
}
1193

    
1194
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1195
{
1196
    AVIStream *ast2 = st2->priv_data;
1197
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1198
    av_free_packet(&ast2->sub_pkt);
1199
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1200
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1201
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1202
}
1203

    
1204
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1205
{
1206
    AVIContext *avi = s->priv_data;
1207
    AVStream *st;
1208
    int i, index;
1209
    int64_t pos;
1210
    AVIStream *ast;
1211

    
1212
    if (!avi->index_loaded) {
1213
        /* we only load the index on demand */
1214
        avi_load_index(s);
1215
        avi->index_loaded = 1;
1216
    }
1217
    assert(stream_index>= 0);
1218

    
1219
    st = s->streams[stream_index];
1220
    ast= st->priv_data;
1221
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1222
    if(index<0)
1223
        return -1;
1224

    
1225
    /* find the position */
1226
    pos = st->index_entries[index].pos;
1227
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1228

    
1229
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1230

    
1231
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1232
        /* One and only one real stream for DV in AVI, and it has video  */
1233
        /* offsets. Calling with other stream indexes should have failed */
1234
        /* the av_index_search_timestamp call above.                     */
1235
        assert(stream_index == 0);
1236

    
1237
        /* Feed the DV video stream version of the timestamp to the */
1238
        /* DV demux so it can synthesize correct timestamps.        */
1239
        dv_offset_reset(avi->dv_demux, timestamp);
1240

    
1241
        url_fseek(s->pb, pos, SEEK_SET);
1242
        avi->stream_index= -1;
1243
        return 0;
1244
    }
1245

    
1246
    for(i = 0; i < s->nb_streams; i++) {
1247
        AVStream *st2 = s->streams[i];
1248
        AVIStream *ast2 = st2->priv_data;
1249

    
1250
        ast2->packet_size=
1251
        ast2->remaining= 0;
1252

    
1253
        if (ast2->sub_ctx) {
1254
            seek_subtitle(st, st2, timestamp);
1255
            continue;
1256
        }
1257

    
1258
        if (st2->nb_index_entries <= 0)
1259
            continue;
1260

    
1261
//        assert(st2->codec->block_align);
1262
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1263
        index = av_index_search_timestamp(
1264
                st2,
1265
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1266
                flags | AVSEEK_FLAG_BACKWARD);
1267
        if(index<0)
1268
            index=0;
1269

    
1270
        if(!avi->non_interleaved){
1271
            while(index>0 && st2->index_entries[index].pos > pos)
1272
                index--;
1273
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1274
                index++;
1275
        }
1276

    
1277
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1278
        /* extract the current frame number */
1279
        ast2->frame_offset = st2->index_entries[index].timestamp;
1280
    }
1281

    
1282
    /* do the seek */
1283
    url_fseek(s->pb, pos, SEEK_SET);
1284
    avi->stream_index= -1;
1285
    return 0;
1286
}
1287

    
1288
static int avi_read_close(AVFormatContext *s)
1289
{
1290
    int i;
1291
    AVIContext *avi = s->priv_data;
1292

    
1293
    for(i=0;i<s->nb_streams;i++) {
1294
        AVStream *st = s->streams[i];
1295
        AVIStream *ast = st->priv_data;
1296
        av_free(st->codec->palctrl);
1297
        if (ast->sub_ctx) {
1298
            av_freep(&ast->sub_ctx->pb);
1299
            av_close_input_stream(ast->sub_ctx);
1300
        }
1301
        av_free(ast->sub_buffer);
1302
        av_free_packet(&ast->sub_pkt);
1303
    }
1304

    
1305
    if (avi->dv_demux)
1306
        av_free(avi->dv_demux);
1307

    
1308
    return 0;
1309
}
1310

    
1311
static int avi_probe(AVProbeData *p)
1312
{
1313
    int i;
1314

    
1315
    /* check file header */
1316
    for(i=0; avi_headers[i][0]; i++)
1317
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1318
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1319
            return AVPROBE_SCORE_MAX;
1320

    
1321
    return 0;
1322
}
1323

    
1324
AVInputFormat avi_demuxer = {
1325
    "avi",
1326
    NULL_IF_CONFIG_SMALL("AVI format"),
1327
    sizeof(AVIContext),
1328
    avi_probe,
1329
    avi_read_header,
1330
    avi_read_packet,
1331
    avi_read_close,
1332
    avi_read_seek,
1333
    .metadata_conv = ff_avi_metadata_conv,
1334
};