Statistics
| Branch: | Revision:

ffmpeg / libavformat / avidec.c @ bc3a73bc

History | View | Annotate | Download (33.1 KB)

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
#include "avformat.h"
22
#include "avi.h"
23
#include "dv.h"
24
#include "riff.h"
25

    
26
#undef NDEBUG
27
#include <assert.h>
28

    
29
//#define DEBUG
30
//#define DEBUG_SEEK
31

    
32
typedef struct AVIStream {
33
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
34
                         (used to compute the pts) */
35
    int remaining;
36
    int packet_size;
37

    
38
    int scale;
39
    int rate;
40
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
41

    
42
    int64_t cum_len; /* temporary storage (used during seek) */
43

    
44
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45
    int prefix_count;
46
} AVIStream;
47

    
48
typedef struct {
49
    int64_t  riff_end;
50
    int64_t  movi_end;
51
    int64_t  fsize;
52
    offset_t movi_list;
53
    int index_loaded;
54
    int is_odml;
55
    int non_interleaved;
56
    int stream_index;
57
    DVDemuxContext* dv_demux;
58
} AVIContext;
59

    
60
static int avi_load_index(AVFormatContext *s);
61
static int guess_ni_flag(AVFormatContext *s);
62

    
63
#ifdef DEBUG
64
static void print_tag(const char *str, unsigned int tag, int size)
65
{
66
    printf("%s: tag=%c%c%c%c size=0x%x\n",
67
           str, tag & 0xff,
68
           (tag >> 8) & 0xff,
69
           (tag >> 16) & 0xff,
70
           (tag >> 24) & 0xff,
71
           size);
72
}
73
#endif
74

    
75
static int get_riff(AVIContext *avi, ByteIOContext *pb)
76
{
77
    uint32_t tag;
78
    /* check RIFF header */
79
    tag = get_le32(pb);
80

    
81
    if (tag != MKTAG('R', 'I', 'F', 'F'))
82
        return -1;
83
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
84
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
85
    tag = get_le32(pb);
86
    if(tag == MKTAG('A', 'V', 'I', 0x19))
87
        av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
88
    else
89
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
90
        return -1;
91

    
92
    return 0;
93
}
94

    
95
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
96
    AVIContext *avi = s->priv_data;
97
    ByteIOContext *pb = &s->pb;
98
    int longs_pre_entry= get_le16(pb);
99
    int index_sub_type = get_byte(pb);
100
    int index_type     = get_byte(pb);
101
    int entries_in_use = get_le32(pb);
102
    int chunk_id       = get_le32(pb);
103
    int64_t base       = get_le64(pb);
104
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
105
    AVStream *st;
106
    AVIStream *ast;
107
    int i;
108
    int64_t last_pos= -1;
109
    int64_t filesize= url_fsize(&s->pb);
110

    
111
#ifdef DEBUG_SEEK
112
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
113
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
114
#endif
115

    
116
    if(stream_id > s->nb_streams || stream_id < 0)
117
        return -1;
118
    st= s->streams[stream_id];
119
    ast = st->priv_data;
120

    
121
    if(index_sub_type)
122
        return -1;
123

    
124
    get_le32(pb);
125

    
126
    if(index_type && longs_pre_entry != 2)
127
        return -1;
128
    if(index_type>1)
129
        return -1;
130

    
131
    if(filesize > 0 && base >= filesize){
132
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
133
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
134
            base &= 0xFFFFFFFF;
135
        else
136
            return -1;
137
    }
138

    
139
    for(i=0; i<entries_in_use; i++){
140
        if(index_type){
141
            int64_t pos= get_le32(pb) + base - 8;
142
            int len    = get_le32(pb);
143
            int key= len >= 0;
144
            len &= 0x7FFFFFFF;
145

    
146
#ifdef DEBUG_SEEK
147
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
148
#endif
149
            if(last_pos == pos || pos == base - 8)
150
                avi->non_interleaved= 1;
151
            else
152
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
153

    
154
            if(ast->sample_size)
155
                ast->cum_len += len;
156
            else
157
                ast->cum_len ++;
158
            last_pos= pos;
159
        }else{
160
            int64_t offset, pos;
161
            int duration;
162
            offset = get_le64(pb);
163
            get_le32(pb);       /* size */
164
            duration = get_le32(pb);
165
            pos = url_ftell(pb);
166

    
167
            url_fseek(pb, offset+8, SEEK_SET);
168
            read_braindead_odml_indx(s, frame_num);
169
            frame_num += duration;
170

    
171
            url_fseek(pb, pos, SEEK_SET);
172
        }
173
    }
174
    avi->index_loaded=1;
175
    return 0;
176
}
177

    
178
static void clean_index(AVFormatContext *s){
179
    int i;
180
    int64_t j;
181

    
182
    for(i=0; i<s->nb_streams; i++){
183
        AVStream *st = s->streams[i];
184
        AVIStream *ast = st->priv_data;
185
        int n= st->nb_index_entries;
186
        int max= ast->sample_size;
187
        int64_t pos, size, ts;
188

    
189
        if(n != 1 || ast->sample_size==0)
190
            continue;
191

    
192
        while(max < 1024) max+=max;
193

    
194
        pos= st->index_entries[0].pos;
195
        size= st->index_entries[0].size;
196
        ts= st->index_entries[0].timestamp;
197

    
198
        for(j=0; j<size; j+=max){
199
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
200
        }
201
    }
202
}
203

    
204
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
205
{
206
    offset_t i = url_ftell(pb);
207
    size += (size & 1);
208
    get_strz(pb, buf, maxlen);
209
    url_fseek(pb, i+size, SEEK_SET);
210
    return 0;
211
}
212

    
213
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
214
{
215
    AVIContext *avi = s->priv_data;
216
    ByteIOContext *pb = &s->pb;
217
    uint32_t tag, tag1, handler;
218
    int codec_type, stream_index, frame_period, bit_rate;
219
    unsigned int size, nb_frames;
220
    int i;
221
    AVStream *st;
222
    AVIStream *ast = NULL;
223
    char str_track[4];
224

    
225
    avi->stream_index= -1;
226

    
227
    if (get_riff(avi, pb) < 0)
228
        return -1;
229

    
230
    avi->fsize = url_fsize(pb);
231
    if(avi->fsize<=0)
232
        avi->fsize= avi->riff_end;
233

    
234
    /* first list tag */
235
    stream_index = -1;
236
    codec_type = -1;
237
    frame_period = 0;
238
    for(;;) {
239
        if (url_feof(pb))
240
            goto fail;
241
        tag = get_le32(pb);
242
        size = get_le32(pb);
243
#ifdef DEBUG
244
        print_tag("tag", tag, size);
245
#endif
246

    
247
        switch(tag) {
248
        case MKTAG('L', 'I', 'S', 'T'):
249
            /* ignored, except when start of video packets */
250
            tag1 = get_le32(pb);
251
#ifdef DEBUG
252
            print_tag("list", tag1, 0);
253
#endif
254
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
255
                avi->movi_list = url_ftell(pb) - 4;
256
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
257
                else     avi->movi_end = url_fsize(pb);
258
#ifdef DEBUG
259
                printf("movi end=%"PRIx64"\n", avi->movi_end);
260
#endif
261
                goto end_of_header;
262
            }
263
            break;
264
        case MKTAG('d', 'm', 'l', 'h'):
265
            avi->is_odml = 1;
266
            url_fskip(pb, size + (size & 1));
267
            break;
268
        case MKTAG('a', 'v', 'i', 'h'):
269
            /* avi header */
270
            /* using frame_period is bad idea */
271
            frame_period = get_le32(pb);
272
            bit_rate = get_le32(pb) * 8;
273
            get_le32(pb);
274
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
275

    
276
            url_fskip(pb, 2 * 4);
277
            get_le32(pb);
278

    
279
            url_fskip(pb, size - 7 * 4);
280
            break;
281
        case MKTAG('s', 't', 'r', 'h'):
282
            /* stream header */
283

    
284
            tag1 = get_le32(pb);
285
            handler = get_le32(pb); /* codec tag */
286

    
287
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
288
                url_fskip(pb, size - 8);
289
                break;
290
            }else{
291
                stream_index++;
292
                st = av_new_stream(s, stream_index);
293
                if (!st)
294
                    goto fail;
295

    
296
                ast = av_mallocz(sizeof(AVIStream));
297
                if (!ast)
298
                    goto fail;
299
                st->priv_data = ast;
300
            }
301

    
302
#ifdef DEBUG
303
            print_tag("strh", tag1, -1);
304
#endif
305
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
306
                int64_t dv_dur;
307

    
308
                /*
309
                 * After some consideration -- I don't think we
310
                 * have to support anything but DV in a type1 AVIs.
311
                 */
312
                if (s->nb_streams != 1)
313
                    goto fail;
314

    
315
                if (handler != MKTAG('d', 'v', 's', 'd') &&
316
                    handler != MKTAG('d', 'v', 'h', 'd') &&
317
                    handler != MKTAG('d', 'v', 's', 'l'))
318
                   goto fail;
319

    
320
                ast = s->streams[0]->priv_data;
321
                av_freep(&s->streams[0]->codec->extradata);
322
                av_freep(&s->streams[0]);
323
                s->nb_streams = 0;
324
                if (ENABLE_DV_DEMUXER) {
325
                    avi->dv_demux = dv_init_demux(s);
326
                    if (!avi->dv_demux)
327
                        goto fail;
328
                }
329
                s->streams[0]->priv_data = ast;
330
                url_fskip(pb, 3 * 4);
331
                ast->scale = get_le32(pb);
332
                ast->rate = get_le32(pb);
333
                url_fskip(pb, 4);  /* start time */
334

    
335
                dv_dur = get_le32(pb);
336
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
337
                    dv_dur *= AV_TIME_BASE;
338
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
339
                }
340
                /*
341
                 * else, leave duration alone; timing estimation in utils.c
342
                 *      will make a guess based on bit rate.
343
                 */
344

    
345
                stream_index = s->nb_streams - 1;
346
                url_fskip(pb, size - 9*4);
347
                break;
348
            }
349

    
350
            assert(stream_index < s->nb_streams);
351
            st->codec->stream_codec_tag= handler;
352

    
353
            get_le32(pb); /* flags */
354
            get_le16(pb); /* priority */
355
            get_le16(pb); /* language */
356
            get_le32(pb); /* initial frame */
357
            ast->scale = get_le32(pb);
358
            ast->rate = get_le32(pb);
359
            if(ast->scale && ast->rate){
360
            }else if(frame_period){
361
                ast->rate = 1000000;
362
                ast->scale = frame_period;
363
            }else{
364
                ast->rate = 25;
365
                ast->scale = 1;
366
            }
367
            av_set_pts_info(st, 64, ast->scale, ast->rate);
368

    
369
            ast->cum_len=get_le32(pb); /* start */
370
            nb_frames = get_le32(pb);
371

    
372
            st->start_time = 0;
373
            st->duration = nb_frames;
374
            get_le32(pb); /* buffer size */
375
            get_le32(pb); /* quality */
376
            ast->sample_size = get_le32(pb); /* sample ssize */
377
            ast->cum_len *= FFMAX(1, ast->sample_size);
378
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
379

    
380
            switch(tag1) {
381
            case MKTAG('v', 'i', 'd', 's'):
382
                codec_type = CODEC_TYPE_VIDEO;
383

    
384
                ast->sample_size = 0;
385
                break;
386
            case MKTAG('a', 'u', 'd', 's'):
387
                codec_type = CODEC_TYPE_AUDIO;
388
                break;
389
            case MKTAG('t', 'x', 't', 's'):
390
                //FIXME
391
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
392
                break;
393
            default:
394
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
395
                goto fail;
396
            }
397
            ast->frame_offset= ast->cum_len;
398
            url_fskip(pb, size - 12 * 4);
399
            break;
400
        case MKTAG('s', 't', 'r', 'f'):
401
            /* stream header */
402
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
403
                url_fskip(pb, size);
404
            } else {
405
                st = s->streams[stream_index];
406
                switch(codec_type) {
407
                case CODEC_TYPE_VIDEO:
408
                    get_le32(pb); /* size */
409
                    st->codec->width = get_le32(pb);
410
                    st->codec->height = get_le32(pb);
411
                    get_le16(pb); /* panes */
412
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
413
                    tag1 = get_le32(pb);
414
                    get_le32(pb); /* ImageSize */
415
                    get_le32(pb); /* XPelsPerMeter */
416
                    get_le32(pb); /* YPelsPerMeter */
417
                    get_le32(pb); /* ClrUsed */
418
                    get_le32(pb); /* ClrImportant */
419

    
420
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
421
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
422
                        st->codec->codec_tag = tag1;
423
                        st->codec->codec_id = CODEC_ID_XSUB;
424
                        break;
425
                    }
426

    
427
                    if(size > 10*4 && size<(1<<30)){
428
                        st->codec->extradata_size= size - 10*4;
429
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
430
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
431
                    }
432

    
433
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
434
                        get_byte(pb);
435

    
436
                    /* Extract palette from extradata if bpp <= 8 */
437
                    /* This code assumes that extradata contains only palette */
438
                    /* This is true for all paletted codecs implemented in ffmpeg */
439
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
440
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
441
#ifdef WORDS_BIGENDIAN
442
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
443
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
444
#else
445
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
446
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
447
#endif
448
                        st->codec->palctrl->palette_changed = 1;
449
                    }
450

    
451
#ifdef DEBUG
452
                    print_tag("video", tag1, 0);
453
#endif
454
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
455
                    st->codec->codec_tag = tag1;
456
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
457
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
458
//                    url_fskip(pb, size - 5 * 4);
459
                    break;
460
                case CODEC_TYPE_AUDIO:
461
                    get_wav_header(pb, st->codec, size);
462
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
463
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
464
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
465
                        url_fskip(pb, 1);
466
                    /* Force parsing as several audio frames can be in
467
                     * one packet and timestamps refer to packet start*/
468
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
469
                    /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
470
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
471
                        st->need_parsing = AVSTREAM_PARSE_NONE;
472
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
473
                     * audio in the header but have Axan as stream_code_tag. */
474
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
475
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
476
                        st->codec->codec_tag = 0;
477
                    }
478
                    break;
479
                default:
480
                    st->codec->codec_type = CODEC_TYPE_DATA;
481
                    st->codec->codec_id= CODEC_ID_NONE;
482
                    st->codec->codec_tag= 0;
483
                    url_fskip(pb, size);
484
                    break;
485
                }
486
            }
487
            break;
488
        case MKTAG('i', 'n', 'd', 'x'):
489
            i= url_ftell(pb);
490
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
491
                read_braindead_odml_indx(s, 0);
492
            }
493
            url_fseek(pb, i+size, SEEK_SET);
494
            break;
495
        case MKTAG('I', 'N', 'A', 'M'):
496
            avi_read_tag(pb, s->title, sizeof(s->title), size);
497
            break;
498
        case MKTAG('I', 'A', 'R', 'T'):
499
            avi_read_tag(pb, s->author, sizeof(s->author), size);
500
            break;
501
        case MKTAG('I', 'C', 'O', 'P'):
502
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
503
            break;
504
        case MKTAG('I', 'C', 'M', 'T'):
505
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
506
            break;
507
        case MKTAG('I', 'G', 'N', 'R'):
508
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
509
            break;
510
        case MKTAG('I', 'P', 'R', 'D'):
511
            avi_read_tag(pb, s->album, sizeof(s->album), size);
512
            break;
513
        case MKTAG('I', 'P', 'R', 'T'):
514
            avi_read_tag(pb, str_track, sizeof(str_track), size);
515
            sscanf(str_track, "%d", &s->track);
516
            break;
517
        default:
518
            if(size > 1000000){
519
                av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
520
                                        "ill ignore it and try to continue anyway\n");
521
                avi->movi_list = url_ftell(pb) - 4;
522
                avi->movi_end  = url_fsize(pb);
523
                goto end_of_header;
524
            }
525
            /* skip tag */
526
            size += (size & 1);
527
            url_fskip(pb, size);
528
            break;
529
        }
530
    }
531
 end_of_header:
532
    /* check stream number */
533
    if (stream_index != s->nb_streams - 1) {
534
    fail:
535
        for(i=0;i<s->nb_streams;i++) {
536
            av_freep(&s->streams[i]->codec->extradata);
537
            av_freep(&s->streams[i]);
538
        }
539
        return -1;
540
    }
541

    
542
    if(!avi->index_loaded && !url_is_streamed(pb))
543
        avi_load_index(s);
544
    avi->index_loaded = 1;
545
    avi->non_interleaved |= guess_ni_flag(s);
546
    if(avi->non_interleaved)
547
        clean_index(s);
548

    
549
    return 0;
550
}
551

    
552
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
553
{
554
    AVIContext *avi = s->priv_data;
555
    ByteIOContext *pb = &s->pb;
556
    int n, d[8], size;
557
    offset_t i, sync;
558
    void* dstr;
559

    
560
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
561
        size = dv_get_packet(avi->dv_demux, pkt);
562
        if (size >= 0)
563
            return size;
564
    }
565

    
566
    if(avi->non_interleaved){
567
        int best_stream_index = 0;
568
        AVStream *best_st= NULL;
569
        AVIStream *best_ast;
570
        int64_t best_ts= INT64_MAX;
571
        int i;
572

    
573
        for(i=0; i<s->nb_streams; i++){
574
            AVStream *st = s->streams[i];
575
            AVIStream *ast = st->priv_data;
576
            int64_t ts= ast->frame_offset;
577

    
578
            if(ast->sample_size)
579
                ts /= ast->sample_size;
580
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
581

    
582
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
583
            if(ts < best_ts){
584
                best_ts= ts;
585
                best_st= st;
586
                best_stream_index= i;
587
            }
588
        }
589
        best_ast = best_st->priv_data;
590
        best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
591
        if(best_ast->remaining)
592
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
593
        else
594
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
595

    
596
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
597
        if(i>=0){
598
            int64_t pos= best_st->index_entries[i].pos;
599
            pos += best_ast->packet_size - best_ast->remaining;
600
            url_fseek(&s->pb, pos + 8, SEEK_SET);
601
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
602

    
603
            assert(best_ast->remaining <= best_ast->packet_size);
604

    
605
            avi->stream_index= best_stream_index;
606
            if(!best_ast->remaining)
607
                best_ast->packet_size=
608
                best_ast->remaining= best_st->index_entries[i].size;
609
        }
610
    }
611

    
612
resync:
613
    if(avi->stream_index >= 0){
614
        AVStream *st= s->streams[ avi->stream_index ];
615
        AVIStream *ast= st->priv_data;
616
        int size;
617

    
618
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
619
            size= INT_MAX;
620
        else if(ast->sample_size < 32)
621
            size= 64*ast->sample_size;
622
        else
623
            size= ast->sample_size;
624

    
625
        if(size > ast->remaining)
626
            size= ast->remaining;
627
        av_get_packet(pb, pkt, size);
628

    
629
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
630
            dstr = pkt->destruct;
631
            size = dv_produce_packet(avi->dv_demux, pkt,
632
                                    pkt->data, pkt->size);
633
            pkt->destruct = dstr;
634
            pkt->flags |= PKT_FLAG_KEY;
635
        } else {
636
            /* XXX: how to handle B frames in avi ? */
637
            pkt->dts = ast->frame_offset;
638
//                pkt->dts += ast->start;
639
            if(ast->sample_size)
640
                pkt->dts /= ast->sample_size;
641
//av_log(NULL, 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);
642
            pkt->stream_index = avi->stream_index;
643

    
644
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
645
                AVIndexEntry *e;
646
                int index;
647
                assert(st->index_entries);
648

    
649
                index= av_index_search_timestamp(st, pkt->dts, 0);
650
                e= &st->index_entries[index];
651

    
652
                if(index >= 0 && e->timestamp == ast->frame_offset){
653
                    if (e->flags & AVINDEX_KEYFRAME)
654
                        pkt->flags |= PKT_FLAG_KEY;
655
                }
656
            } else {
657
                pkt->flags |= PKT_FLAG_KEY;
658
            }
659
            if(ast->sample_size)
660
                ast->frame_offset += pkt->size;
661
            else
662
                ast->frame_offset++;
663
        }
664
        ast->remaining -= size;
665
        if(!ast->remaining){
666
            avi->stream_index= -1;
667
            ast->packet_size= 0;
668
        }
669

    
670
        return size;
671
    }
672

    
673
    memset(d, -1, sizeof(int)*8);
674
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
675
        int j;
676

    
677
        for(j=0; j<7; j++)
678
            d[j]= d[j+1];
679
        d[7]= get_byte(pb);
680

    
681
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
682

    
683
        if(    d[2] >= '0' && d[2] <= '9'
684
            && d[3] >= '0' && d[3] <= '9'){
685
            n= (d[2] - '0') * 10 + (d[3] - '0');
686
        }else{
687
            n= 100; //invalid stream id
688
        }
689
//av_log(NULL, 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);
690
        if(i + size > avi->fsize || d[0]<0)
691
            continue;
692

    
693
        //parse ix##
694
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
695
        //parse JUNK
696
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
697
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
698
            url_fskip(pb, size);
699
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
700
            goto resync;
701
        }
702

    
703
        if(    d[0] >= '0' && d[0] <= '9'
704
            && d[1] >= '0' && d[1] <= '9'){
705
            n= (d[0] - '0') * 10 + (d[1] - '0');
706
        }else{
707
            n= 100; //invalid stream id
708
        }
709

    
710
        //parse ##dc/##wb
711
        if(n < s->nb_streams){
712
          AVStream *st;
713
          AVIStream *ast;
714
          st = s->streams[n];
715
          ast = st->priv_data;
716

    
717
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
718
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
719
             || st->discard >= AVDISCARD_ALL){
720
                if(ast->sample_size) ast->frame_offset += pkt->size;
721
                else                 ast->frame_offset++;
722
                url_fskip(pb, size);
723
                goto resync;
724
          }
725

    
726
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
727
                d[2]*256+d[3] == ast->prefix /*||
728
                (d[2] == 'd' && d[3] == 'c') ||
729
                (d[2] == 'w' && d[3] == 'b')*/) {
730

    
731
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
732
            if(d[2]*256+d[3] == ast->prefix)
733
                ast->prefix_count++;
734
            else{
735
                ast->prefix= d[2]*256+d[3];
736
                ast->prefix_count= 0;
737
            }
738

    
739
            avi->stream_index= n;
740
            ast->packet_size= size + 8;
741
            ast->remaining= size;
742

    
743
            {
744
                uint64_t pos= url_ftell(pb) - 8;
745
                if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
746
                    av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
747
                }
748
            }
749
            goto resync;
750
          }
751
        }
752
        /* palette changed chunk */
753
        if (   d[0] >= '0' && d[0] <= '9'
754
            && d[1] >= '0' && d[1] <= '9'
755
            && ((d[2] == 'p' && d[3] == 'c'))
756
            && n < s->nb_streams && i + size <= avi->fsize) {
757

    
758
            AVStream *st;
759
            int first, clr, flags, k, p;
760

    
761
            st = s->streams[n];
762

    
763
            first = get_byte(pb);
764
            clr = get_byte(pb);
765
            if(!clr) /* all 256 colors used */
766
                clr = 256;
767
            flags = get_le16(pb);
768
            p = 4;
769
            for (k = first; k < clr + first; k++) {
770
                int r, g, b;
771
                r = get_byte(pb);
772
                g = get_byte(pb);
773
                b = get_byte(pb);
774
                    get_byte(pb);
775
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
776
            }
777
            st->codec->palctrl->palette_changed = 1;
778
            goto resync;
779
        }
780

    
781
    }
782

    
783
    return -1;
784
}
785

    
786
/* XXX: we make the implicit supposition that the position are sorted
787
   for each stream */
788
static int avi_read_idx1(AVFormatContext *s, int size)
789
{
790
    AVIContext *avi = s->priv_data;
791
    ByteIOContext *pb = &s->pb;
792
    int nb_index_entries, i;
793
    AVStream *st;
794
    AVIStream *ast;
795
    unsigned int index, tag, flags, pos, len;
796
    unsigned last_pos= -1;
797

    
798
    nb_index_entries = size / 16;
799
    if (nb_index_entries <= 0)
800
        return -1;
801

    
802
    /* read the entries and sort them in each stream component */
803
    for(i = 0; i < nb_index_entries; i++) {
804
        tag = get_le32(pb);
805
        flags = get_le32(pb);
806
        pos = get_le32(pb);
807
        len = get_le32(pb);
808
#if defined(DEBUG_SEEK)
809
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
810
               i, tag, flags, pos, len);
811
#endif
812
        if(i==0 && pos > avi->movi_list)
813
            avi->movi_list= 0; //FIXME better check
814
        pos += avi->movi_list;
815

    
816
        index = ((tag & 0xff) - '0') * 10;
817
        index += ((tag >> 8) & 0xff) - '0';
818
        if (index >= s->nb_streams)
819
            continue;
820
        st = s->streams[index];
821
        ast = st->priv_data;
822

    
823
#if defined(DEBUG_SEEK)
824
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
825
#endif
826
        if(last_pos == pos)
827
            avi->non_interleaved= 1;
828
        else
829
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
830
        if(ast->sample_size)
831
            ast->cum_len += len;
832
        else
833
            ast->cum_len ++;
834
        last_pos= pos;
835
    }
836
    return 0;
837
}
838

    
839
static int guess_ni_flag(AVFormatContext *s){
840
    int i;
841
    int64_t last_start=0;
842
    int64_t first_end= INT64_MAX;
843

    
844
    for(i=0; i<s->nb_streams; i++){
845
        AVStream *st = s->streams[i];
846
        int n= st->nb_index_entries;
847

    
848
        if(n <= 0)
849
            continue;
850

    
851
        if(st->index_entries[0].pos > last_start)
852
            last_start= st->index_entries[0].pos;
853
        if(st->index_entries[n-1].pos < first_end)
854
            first_end= st->index_entries[n-1].pos;
855
    }
856
    return last_start > first_end;
857
}
858

    
859
static int avi_load_index(AVFormatContext *s)
860
{
861
    AVIContext *avi = s->priv_data;
862
    ByteIOContext *pb = &s->pb;
863
    uint32_t tag, size;
864
    offset_t pos= url_ftell(pb);
865

    
866
    url_fseek(pb, avi->movi_end, SEEK_SET);
867
#ifdef DEBUG_SEEK
868
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
869
#endif
870
    for(;;) {
871
        if (url_feof(pb))
872
            break;
873
        tag = get_le32(pb);
874
        size = get_le32(pb);
875
#ifdef DEBUG_SEEK
876
        printf("tag=%c%c%c%c size=0x%x\n",
877
               tag & 0xff,
878
               (tag >> 8) & 0xff,
879
               (tag >> 16) & 0xff,
880
               (tag >> 24) & 0xff,
881
               size);
882
#endif
883
        switch(tag) {
884
        case MKTAG('i', 'd', 'x', '1'):
885
            if (avi_read_idx1(s, size) < 0)
886
                goto skip;
887
            else
888
                goto the_end;
889
            break;
890
        default:
891
        skip:
892
            size += (size & 1);
893
            url_fskip(pb, size);
894
            break;
895
        }
896
    }
897
 the_end:
898
    url_fseek(pb, pos, SEEK_SET);
899
    return 0;
900
}
901

    
902
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
903
{
904
    AVIContext *avi = s->priv_data;
905
    AVStream *st;
906
    int i, index;
907
    int64_t pos;
908

    
909
    if (!avi->index_loaded) {
910
        /* we only load the index on demand */
911
        avi_load_index(s);
912
        avi->index_loaded = 1;
913
    }
914
    assert(stream_index>= 0);
915

    
916
    st = s->streams[stream_index];
917
    index= av_index_search_timestamp(st, timestamp, flags);
918
    if(index<0)
919
        return -1;
920

    
921
    /* find the position */
922
    pos = st->index_entries[index].pos;
923
    timestamp = st->index_entries[index].timestamp;
924

    
925
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
926

    
927
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
928
        /* One and only one real stream for DV in AVI, and it has video  */
929
        /* offsets. Calling with other stream indices should have failed */
930
        /* the av_index_search_timestamp call above.                     */
931
        assert(stream_index == 0);
932

    
933
        /* Feed the DV video stream version of the timestamp to the */
934
        /* DV demux so it can synth correct timestamps              */
935
        dv_offset_reset(avi->dv_demux, timestamp);
936

    
937
        url_fseek(&s->pb, pos, SEEK_SET);
938
        avi->stream_index= -1;
939
        return 0;
940
    }
941

    
942
    for(i = 0; i < s->nb_streams; i++) {
943
        AVStream *st2 = s->streams[i];
944
        AVIStream *ast2 = st2->priv_data;
945

    
946
        ast2->packet_size=
947
        ast2->remaining= 0;
948

    
949
        if (st2->nb_index_entries <= 0)
950
            continue;
951

    
952
//        assert(st2->codec->block_align);
953
        assert(st2->time_base.den == ast2->rate);
954
        assert(st2->time_base.num == ast2->scale);
955
        index = av_index_search_timestamp(
956
                st2,
957
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
958
                flags | AVSEEK_FLAG_BACKWARD);
959
        if(index<0)
960
            index=0;
961

    
962
        if(!avi->non_interleaved){
963
            while(index>0 && st2->index_entries[index].pos > pos)
964
                index--;
965
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
966
                index++;
967
        }
968

    
969
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
970
        /* extract the current frame number */
971
        ast2->frame_offset = st2->index_entries[index].timestamp;
972
        if(ast2->sample_size)
973
            ast2->frame_offset *=ast2->sample_size;
974
    }
975

    
976
    /* do the seek */
977
    url_fseek(&s->pb, pos, SEEK_SET);
978
    avi->stream_index= -1;
979
    return 0;
980
}
981

    
982
static int avi_read_close(AVFormatContext *s)
983
{
984
    int i;
985
    AVIContext *avi = s->priv_data;
986

    
987
    for(i=0;i<s->nb_streams;i++) {
988
        AVStream *st = s->streams[i];
989
        AVIStream *ast = st->priv_data;
990
        av_free(ast);
991
        av_free(st->codec->palctrl);
992
    }
993

    
994
    if (avi->dv_demux)
995
        av_free(avi->dv_demux);
996

    
997
    return 0;
998
}
999

    
1000
static int avi_probe(AVProbeData *p)
1001
{
1002
    /* check file header */
1003
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
1004
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
1005
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
1006
        p->buf[10] == 'I' && (p->buf[11] == ' ' || p->buf[11] == 0x19))
1007
        return AVPROBE_SCORE_MAX;
1008
    else
1009
        return 0;
1010
}
1011

    
1012
AVInputFormat avi_demuxer = {
1013
    "avi",
1014
    "avi format",
1015
    sizeof(AVIContext),
1016
    avi_probe,
1017
    avi_read_header,
1018
    avi_read_packet,
1019
    avi_read_close,
1020
    avi_read_seek,
1021
};