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ffmpeg / libavformat / avidec.c @ e1315fb1

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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
#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
    offset_t movi_list;
52
    int index_loaded;
53
    int is_odml;
54
    int non_interleaved;
55
    int stream_index;
56
    DVDemuxContext* dv_demux;
57
} AVIContext;
58

    
59
static int avi_load_index(AVFormatContext *s);
60
static int guess_ni_flag(AVFormatContext *s);
61

    
62
#ifdef DEBUG
63
static void print_tag(const char *str, unsigned int tag, int size)
64
{
65
    printf("%s: tag=%c%c%c%c size=0x%x\n",
66
           str, tag & 0xff,
67
           (tag >> 8) & 0xff,
68
           (tag >> 16) & 0xff,
69
           (tag >> 24) & 0xff,
70
           size);
71
}
72
#endif
73

    
74
static int get_riff(AVIContext *avi, ByteIOContext *pb)
75
{
76
    uint32_t tag;
77
    /* check RIFF header */
78
    tag = get_le32(pb);
79

    
80
    if (tag != MKTAG('R', 'I', 'F', 'F'))
81
        return -1;
82
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
83
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
84
    tag = get_le32(pb);
85
    if(tag == MKTAG('A', 'V', 'I', 0x19))
86
        av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
87
    else
88
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
89
        return -1;
90

    
91
    return 0;
92
}
93

    
94
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
95
    AVIContext *avi = s->priv_data;
96
    ByteIOContext *pb = &s->pb;
97
    int longs_pre_entry= get_le16(pb);
98
    int index_sub_type = get_byte(pb);
99
    int index_type     = get_byte(pb);
100
    int entries_in_use = get_le32(pb);
101
    int chunk_id       = get_le32(pb);
102
    int64_t base       = get_le64(pb);
103
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
104
    AVStream *st;
105
    AVIStream *ast;
106
    int i;
107
    int64_t last_pos= -1;
108
    int64_t filesize= url_fsize(&s->pb);
109

    
110
#ifdef DEBUG_SEEK
111
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
112
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
113
#endif
114

    
115
    if(stream_id > s->nb_streams || stream_id < 0)
116
        return -1;
117
    st= s->streams[stream_id];
118
    ast = st->priv_data;
119

    
120
    if(index_sub_type)
121
        return -1;
122

    
123
    get_le32(pb);
124

    
125
    if(index_type && longs_pre_entry != 2)
126
        return -1;
127
    if(index_type>1)
128
        return -1;
129

    
130
    if(filesize > 0 && base >= filesize){
131
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
132
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
133
            base &= 0xFFFFFFFF;
134
        else
135
            return -1;
136
    }
137

    
138
    for(i=0; i<entries_in_use; i++){
139
        if(index_type){
140
            int64_t pos= get_le32(pb) + base - 8;
141
            int len    = get_le32(pb);
142
            int key= len >= 0;
143
            len &= 0x7FFFFFFF;
144

    
145
#ifdef DEBUG_SEEK
146
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
147
#endif
148
            if(last_pos == pos || pos == base - 8)
149
                avi->non_interleaved= 1;
150
            else
151
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
152

    
153
            if(ast->sample_size)
154
                ast->cum_len += len;
155
            else
156
                ast->cum_len ++;
157
            last_pos= pos;
158
        }else{
159
            int64_t offset, pos;
160
            int duration;
161
            offset = get_le64(pb);
162
            get_le32(pb);       /* size */
163
            duration = get_le32(pb);
164
            pos = url_ftell(pb);
165

    
166
            url_fseek(pb, offset+8, SEEK_SET);
167
            read_braindead_odml_indx(s, frame_num);
168
            frame_num += duration;
169

    
170
            url_fseek(pb, pos, SEEK_SET);
171
        }
172
    }
173
    avi->index_loaded=1;
174
    return 0;
175
}
176

    
177
static void clean_index(AVFormatContext *s){
178
    int i;
179
    int64_t j;
180

    
181
    for(i=0; i<s->nb_streams; i++){
182
        AVStream *st = s->streams[i];
183
        AVIStream *ast = st->priv_data;
184
        int n= st->nb_index_entries;
185
        int max= ast->sample_size;
186
        int64_t pos, size, ts;
187

    
188
        if(n != 1 || ast->sample_size==0)
189
            continue;
190

    
191
        while(max < 1024) max+=max;
192

    
193
        pos= st->index_entries[0].pos;
194
        size= st->index_entries[0].size;
195
        ts= st->index_entries[0].timestamp;
196

    
197
        for(j=0; j<size; j+=max){
198
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
199
        }
200
    }
201
}
202

    
203
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
204
{
205
    offset_t i = url_ftell(pb);
206
    size += (size & 1);
207
    get_strz(pb, buf, maxlen);
208
    url_fseek(pb, i+size, SEEK_SET);
209
    return 0;
210
}
211

    
212
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
213
{
214
    AVIContext *avi = s->priv_data;
215
    ByteIOContext *pb = &s->pb;
216
    uint32_t tag, tag1, handler;
217
    int codec_type, stream_index, frame_period, bit_rate;
218
    unsigned int size, nb_frames;
219
    int i;
220
    AVStream *st;
221
    AVIStream *ast = NULL;
222
    char str_track[4];
223

    
224
    avi->stream_index= -1;
225

    
226
    if (get_riff(avi, pb) < 0)
227
        return -1;
228

    
229
    /* first list tag */
230
    stream_index = -1;
231
    codec_type = -1;
232
    frame_period = 0;
233
    for(;;) {
234
        if (url_feof(pb))
235
            goto fail;
236
        tag = get_le32(pb);
237
        size = get_le32(pb);
238
#ifdef DEBUG
239
        print_tag("tag", tag, size);
240
#endif
241

    
242
        switch(tag) {
243
        case MKTAG('L', 'I', 'S', 'T'):
244
            /* ignored, except when start of video packets */
245
            tag1 = get_le32(pb);
246
#ifdef DEBUG
247
            print_tag("list", tag1, 0);
248
#endif
249
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
250
                avi->movi_list = url_ftell(pb) - 4;
251
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
252
                else     avi->movi_end = url_fsize(pb);
253
#ifdef DEBUG
254
                printf("movi end=%"PRIx64"\n", avi->movi_end);
255
#endif
256
                goto end_of_header;
257
            }
258
            break;
259
        case MKTAG('d', 'm', 'l', 'h'):
260
            avi->is_odml = 1;
261
            url_fskip(pb, size + (size & 1));
262
            break;
263
        case MKTAG('a', 'v', 'i', 'h'):
264
            /* avi header */
265
            /* using frame_period is bad idea */
266
            frame_period = get_le32(pb);
267
            bit_rate = get_le32(pb) * 8;
268
            get_le32(pb);
269
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
270

    
271
            url_fskip(pb, 2 * 4);
272
            get_le32(pb);
273

    
274
            url_fskip(pb, size - 7 * 4);
275
            break;
276
        case MKTAG('s', 't', 'r', 'h'):
277
            /* stream header */
278

    
279
            tag1 = get_le32(pb);
280
            handler = get_le32(pb); /* codec tag */
281

    
282
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
283
                url_fskip(pb, size - 8);
284
                break;
285
            }else{
286
                stream_index++;
287
                st = av_new_stream(s, stream_index);
288
                if (!st)
289
                    goto fail;
290

    
291
                ast = av_mallocz(sizeof(AVIStream));
292
                if (!ast)
293
                    goto fail;
294
                st->priv_data = ast;
295
            }
296

    
297
#ifdef DEBUG
298
            print_tag("strh", tag1, -1);
299
#endif
300
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
301
                int64_t dv_dur;
302

    
303
                /*
304
                 * After some consideration -- I don't think we
305
                 * have to support anything but DV in a type1 AVIs.
306
                 */
307
                if (s->nb_streams != 1)
308
                    goto fail;
309

    
310
                if (handler != MKTAG('d', 'v', 's', 'd') &&
311
                    handler != MKTAG('d', 'v', 'h', 'd') &&
312
                    handler != MKTAG('d', 'v', 's', 'l'))
313
                   goto fail;
314

    
315
                ast = s->streams[0]->priv_data;
316
                av_freep(&s->streams[0]->codec->extradata);
317
                av_freep(&s->streams[0]);
318
                s->nb_streams = 0;
319
                if (ENABLE_DV_DEMUXER) {
320
                    avi->dv_demux = dv_init_demux(s);
321
                    if (!avi->dv_demux)
322
                        goto fail;
323
                }
324
                s->streams[0]->priv_data = ast;
325
                url_fskip(pb, 3 * 4);
326
                ast->scale = get_le32(pb);
327
                ast->rate = get_le32(pb);
328
                url_fskip(pb, 4);  /* start time */
329

    
330
                dv_dur = get_le32(pb);
331
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
332
                    dv_dur *= AV_TIME_BASE;
333
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
334
                }
335
                /*
336
                 * else, leave duration alone; timing estimation in utils.c
337
                 *      will make a guess based on bit rate.
338
                 */
339

    
340
                stream_index = s->nb_streams - 1;
341
                url_fskip(pb, size - 9*4);
342
                break;
343
            }
344

    
345
            assert(stream_index < s->nb_streams);
346
            st->codec->stream_codec_tag= handler;
347

    
348
            get_le32(pb); /* flags */
349
            get_le16(pb); /* priority */
350
            get_le16(pb); /* language */
351
            get_le32(pb); /* initial frame */
352
            ast->scale = get_le32(pb);
353
            ast->rate = get_le32(pb);
354
            if(ast->scale && ast->rate){
355
            }else if(frame_period){
356
                ast->rate = 1000000;
357
                ast->scale = frame_period;
358
            }else{
359
                ast->rate = 25;
360
                ast->scale = 1;
361
            }
362
            av_set_pts_info(st, 64, ast->scale, ast->rate);
363

    
364
            ast->cum_len=get_le32(pb); /* start */
365
            nb_frames = get_le32(pb);
366

    
367
            st->start_time = 0;
368
            st->duration = nb_frames;
369
            get_le32(pb); /* buffer size */
370
            get_le32(pb); /* quality */
371
            ast->sample_size = get_le32(pb); /* sample ssize */
372
            ast->cum_len *= FFMAX(1, ast->sample_size);
373
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
374

    
375
            switch(tag1) {
376
            case MKTAG('v', 'i', 'd', 's'):
377
                codec_type = CODEC_TYPE_VIDEO;
378

    
379
                ast->sample_size = 0;
380
                break;
381
            case MKTAG('a', 'u', 'd', 's'):
382
                codec_type = CODEC_TYPE_AUDIO;
383
                break;
384
            case MKTAG('t', 'x', 't', 's'):
385
                //FIXME
386
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
387
                break;
388
            default:
389
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
390
                goto fail;
391
            }
392
            ast->frame_offset= ast->cum_len;
393
            url_fskip(pb, size - 12 * 4);
394
            break;
395
        case MKTAG('s', 't', 'r', 'f'):
396
            /* stream header */
397
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
398
                url_fskip(pb, size);
399
            } else {
400
                st = s->streams[stream_index];
401
                switch(codec_type) {
402
                case CODEC_TYPE_VIDEO:
403
                    get_le32(pb); /* size */
404
                    st->codec->width = get_le32(pb);
405
                    st->codec->height = get_le32(pb);
406
                    get_le16(pb); /* panes */
407
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
408
                    tag1 = get_le32(pb);
409
                    get_le32(pb); /* ImageSize */
410
                    get_le32(pb); /* XPelsPerMeter */
411
                    get_le32(pb); /* YPelsPerMeter */
412
                    get_le32(pb); /* ClrUsed */
413
                    get_le32(pb); /* ClrImportant */
414

    
415
                    if(size > 10*4 && size<(1<<30)){
416
                        st->codec->extradata_size= size - 10*4;
417
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
418
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
419
                    }
420

    
421
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
422
                        get_byte(pb);
423

    
424
                    /* Extract palette from extradata if bpp <= 8 */
425
                    /* This code assumes that extradata contains only palette */
426
                    /* This is true for all paletted codecs implemented in ffmpeg */
427
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
428
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
429
#ifdef WORDS_BIGENDIAN
430
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
431
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
432
#else
433
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
434
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
435
#endif
436
                        st->codec->palctrl->palette_changed = 1;
437
                    }
438

    
439
#ifdef DEBUG
440
                    print_tag("video", tag1, 0);
441
#endif
442
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
443
                    st->codec->codec_tag = tag1;
444
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
445
                    st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts
446
//                    url_fskip(pb, size - 5 * 4);
447
                    break;
448
                case CODEC_TYPE_AUDIO:
449
                    get_wav_header(pb, st->codec, size);
450
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
451
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
452
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
453
                        url_fskip(pb, 1);
454
                    /* Force parsing as several audio frames can be in
455
                     * one packet. */
456
                    st->need_parsing = 1;
457
                    /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
458
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
459
                        st->need_parsing = 0;
460
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
461
                     * audio in the header but have Axan as stream_code_tag. */
462
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
463
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
464
                        st->codec->codec_tag = 0;
465
                    }
466
                    break;
467
                default:
468
                    st->codec->codec_type = CODEC_TYPE_DATA;
469
                    st->codec->codec_id= CODEC_ID_NONE;
470
                    st->codec->codec_tag= 0;
471
                    url_fskip(pb, size);
472
                    break;
473
                }
474
            }
475
            break;
476
        case MKTAG('i', 'n', 'd', 'x'):
477
            i= url_ftell(pb);
478
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
479
                read_braindead_odml_indx(s, 0);
480
            }
481
            url_fseek(pb, i+size, SEEK_SET);
482
            break;
483
        case MKTAG('I', 'N', 'A', 'M'):
484
            avi_read_tag(pb, s->title, sizeof(s->title), size);
485
            break;
486
        case MKTAG('I', 'A', 'R', 'T'):
487
            avi_read_tag(pb, s->author, sizeof(s->author), size);
488
            break;
489
        case MKTAG('I', 'C', 'O', 'P'):
490
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
491
            break;
492
        case MKTAG('I', 'C', 'M', 'T'):
493
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
494
            break;
495
        case MKTAG('I', 'G', 'N', 'R'):
496
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
497
            break;
498
        case MKTAG('I', 'P', 'R', 'D'):
499
            avi_read_tag(pb, s->album, sizeof(s->album), size);
500
            break;
501
        case MKTAG('I', 'P', 'R', 'T'):
502
            avi_read_tag(pb, str_track, sizeof(str_track), size);
503
            sscanf(str_track, "%d", &s->track);
504
            break;
505
        default:
506
            if(size > 1000000){
507
                av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
508
                                        "ill ignore it and try to continue anyway\n");
509
                avi->movi_list = url_ftell(pb) - 4;
510
                avi->movi_end  = url_fsize(pb);
511
                goto end_of_header;
512
            }
513
            /* skip tag */
514
            size += (size & 1);
515
            url_fskip(pb, size);
516
            break;
517
        }
518
    }
519
 end_of_header:
520
    /* check stream number */
521
    if (stream_index != s->nb_streams - 1) {
522
    fail:
523
        for(i=0;i<s->nb_streams;i++) {
524
            av_freep(&s->streams[i]->codec->extradata);
525
            av_freep(&s->streams[i]);
526
        }
527
        return -1;
528
    }
529

    
530
    if(!avi->index_loaded && !url_is_streamed(pb))
531
        avi_load_index(s);
532
    avi->index_loaded = 1;
533
    avi->non_interleaved |= guess_ni_flag(s);
534
    if(avi->non_interleaved)
535
        clean_index(s);
536

    
537
    return 0;
538
}
539

    
540
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
541
{
542
    AVIContext *avi = s->priv_data;
543
    ByteIOContext *pb = &s->pb;
544
    int n, d[8], size;
545
    offset_t i, sync;
546
    void* dstr;
547

    
548
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
549
        size = dv_get_packet(avi->dv_demux, pkt);
550
        if (size >= 0)
551
            return size;
552
    }
553

    
554
    if(avi->non_interleaved){
555
        int best_stream_index = 0;
556
        AVStream *best_st= NULL;
557
        AVIStream *best_ast;
558
        int64_t best_ts= INT64_MAX;
559
        int i;
560

    
561
        for(i=0; i<s->nb_streams; i++){
562
            AVStream *st = s->streams[i];
563
            AVIStream *ast = st->priv_data;
564
            int64_t ts= ast->frame_offset;
565

    
566
            if(ast->sample_size)
567
                ts /= ast->sample_size;
568
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
569

    
570
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
571
            if(ts < best_ts){
572
                best_ts= ts;
573
                best_st= st;
574
                best_stream_index= i;
575
            }
576
        }
577
        best_ast = best_st->priv_data;
578
        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
579
        if(best_ast->remaining)
580
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
581
        else
582
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
583

    
584
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
585
        if(i>=0){
586
            int64_t pos= best_st->index_entries[i].pos;
587
            pos += best_ast->packet_size - best_ast->remaining;
588
            url_fseek(&s->pb, pos + 8, SEEK_SET);
589
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
590

    
591
            assert(best_ast->remaining <= best_ast->packet_size);
592

    
593
            avi->stream_index= best_stream_index;
594
            if(!best_ast->remaining)
595
                best_ast->packet_size=
596
                best_ast->remaining= best_st->index_entries[i].size;
597
        }
598
    }
599

    
600
resync:
601
    if(avi->stream_index >= 0){
602
        AVStream *st= s->streams[ avi->stream_index ];
603
        AVIStream *ast= st->priv_data;
604
        int size;
605

    
606
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
607
            size= INT_MAX;
608
        else if(ast->sample_size < 32)
609
            size= 64*ast->sample_size;
610
        else
611
            size= ast->sample_size;
612

    
613
        if(size > ast->remaining)
614
            size= ast->remaining;
615
        av_get_packet(pb, pkt, size);
616

    
617
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
618
            dstr = pkt->destruct;
619
            size = dv_produce_packet(avi->dv_demux, pkt,
620
                                    pkt->data, pkt->size);
621
            pkt->destruct = dstr;
622
            pkt->flags |= PKT_FLAG_KEY;
623
        } else {
624
            /* XXX: how to handle B frames in avi ? */
625
            pkt->dts = ast->frame_offset;
626
//                pkt->dts += ast->start;
627
            if(ast->sample_size)
628
                pkt->dts /= ast->sample_size;
629
//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);
630
            pkt->stream_index = avi->stream_index;
631

    
632
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
633
                AVIndexEntry *e;
634
                int index;
635
                assert(st->index_entries);
636

    
637
                index= av_index_search_timestamp(st, pkt->dts, 0);
638
                e= &st->index_entries[index];
639

    
640
                if(index >= 0 && e->timestamp == ast->frame_offset){
641
                    if (e->flags & AVINDEX_KEYFRAME)
642
                        pkt->flags |= PKT_FLAG_KEY;
643
                }
644
            } else {
645
                pkt->flags |= PKT_FLAG_KEY;
646
            }
647
            if(ast->sample_size)
648
                ast->frame_offset += pkt->size;
649
            else
650
                ast->frame_offset++;
651
        }
652
        ast->remaining -= size;
653
        if(!ast->remaining){
654
            avi->stream_index= -1;
655
            ast->packet_size= 0;
656
        }
657

    
658
        return size;
659
    }
660

    
661
    memset(d, -1, sizeof(int)*8);
662
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
663
        int j;
664

    
665
        if (i >= avi->movi_end) {
666
            if (avi->is_odml) {
667
                url_fskip(pb, avi->riff_end - i);
668
                avi->riff_end = avi->movi_end = url_fsize(pb);
669
            } else
670
                break;
671
        }
672

    
673
        for(j=0; j<7; j++)
674
            d[j]= d[j+1];
675
        d[7]= get_byte(pb);
676

    
677
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
678

    
679
        if(    d[2] >= '0' && d[2] <= '9'
680
            && d[3] >= '0' && d[3] <= '9'){
681
            n= (d[2] - '0') * 10 + (d[3] - '0');
682
        }else{
683
            n= 100; //invalid stream id
684
        }
685
//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);
686
        if(i + size > avi->movi_end || d[0]<0)
687
            continue;
688

    
689
        //parse ix##
690
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
691
        //parse JUNK
692
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
693
            url_fskip(pb, size);
694
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
695
            goto resync;
696
        }
697

    
698
        if(    d[0] >= '0' && d[0] <= '9'
699
            && d[1] >= '0' && d[1] <= '9'){
700
            n= (d[0] - '0') * 10 + (d[1] - '0');
701
        }else{
702
            n= 100; //invalid stream id
703
        }
704

    
705
        //parse ##dc/##wb
706
        if(n < s->nb_streams){
707
          AVStream *st;
708
          AVIStream *ast;
709
          st = s->streams[n];
710
          ast = st->priv_data;
711

    
712
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
713
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
714
             || st->discard >= AVDISCARD_ALL){
715
                if(ast->sample_size) ast->frame_offset += pkt->size;
716
                else                 ast->frame_offset++;
717
                url_fskip(pb, size);
718
                goto resync;
719
          }
720

    
721
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
722
                d[2]*256+d[3] == ast->prefix /*||
723
                (d[2] == 'd' && d[3] == 'c') ||
724
                (d[2] == 'w' && d[3] == 'b')*/) {
725

    
726
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
727
            if(d[2]*256+d[3] == ast->prefix)
728
                ast->prefix_count++;
729
            else{
730
                ast->prefix= d[2]*256+d[3];
731
                ast->prefix_count= 0;
732
            }
733

    
734
            avi->stream_index= n;
735
            ast->packet_size= size + 8;
736
            ast->remaining= size;
737

    
738
            {
739
                uint64_t pos= url_ftell(pb) - 8;
740
                if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
741
                    av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
742
                }
743
            }
744
            goto resync;
745
          }
746
        }
747
        /* palette changed chunk */
748
        if (   d[0] >= '0' && d[0] <= '9'
749
            && d[1] >= '0' && d[1] <= '9'
750
            && ((d[2] == 'p' && d[3] == 'c'))
751
            && n < s->nb_streams && i + size <= avi->movi_end) {
752

    
753
            AVStream *st;
754
            int first, clr, flags, k, p;
755

    
756
            st = s->streams[n];
757

    
758
            first = get_byte(pb);
759
            clr = get_byte(pb);
760
            if(!clr) /* all 256 colors used */
761
                clr = 256;
762
            flags = get_le16(pb);
763
            p = 4;
764
            for (k = first; k < clr + first; k++) {
765
                int r, g, b;
766
                r = get_byte(pb);
767
                g = get_byte(pb);
768
                b = get_byte(pb);
769
                    get_byte(pb);
770
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
771
            }
772
            st->codec->palctrl->palette_changed = 1;
773
            goto resync;
774
        }
775

    
776
    }
777

    
778
    return -1;
779
}
780

    
781
/* XXX: we make the implicit supposition that the position are sorted
782
   for each stream */
783
static int avi_read_idx1(AVFormatContext *s, int size)
784
{
785
    AVIContext *avi = s->priv_data;
786
    ByteIOContext *pb = &s->pb;
787
    int nb_index_entries, i;
788
    AVStream *st;
789
    AVIStream *ast;
790
    unsigned int index, tag, flags, pos, len;
791
    unsigned last_pos= -1;
792

    
793
    nb_index_entries = size / 16;
794
    if (nb_index_entries <= 0)
795
        return -1;
796

    
797
    /* read the entries and sort them in each stream component */
798
    for(i = 0; i < nb_index_entries; i++) {
799
        tag = get_le32(pb);
800
        flags = get_le32(pb);
801
        pos = get_le32(pb);
802
        len = get_le32(pb);
803
#if defined(DEBUG_SEEK)
804
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
805
               i, tag, flags, pos, len);
806
#endif
807
        if(i==0 && pos > avi->movi_list)
808
            avi->movi_list= 0; //FIXME better check
809
        pos += avi->movi_list;
810

    
811
        index = ((tag & 0xff) - '0') * 10;
812
        index += ((tag >> 8) & 0xff) - '0';
813
        if (index >= s->nb_streams)
814
            continue;
815
        st = s->streams[index];
816
        ast = st->priv_data;
817

    
818
#if defined(DEBUG_SEEK)
819
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
820
#endif
821
        if(last_pos == pos)
822
            avi->non_interleaved= 1;
823
        else
824
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
825
        if(ast->sample_size)
826
            ast->cum_len += len;
827
        else
828
            ast->cum_len ++;
829
        last_pos= pos;
830
    }
831
    return 0;
832
}
833

    
834
static int guess_ni_flag(AVFormatContext *s){
835
    int i;
836
    int64_t last_start=0;
837
    int64_t first_end= INT64_MAX;
838

    
839
    for(i=0; i<s->nb_streams; i++){
840
        AVStream *st = s->streams[i];
841
        int n= st->nb_index_entries;
842

    
843
        if(n <= 0)
844
            continue;
845

    
846
        if(st->index_entries[0].pos > last_start)
847
            last_start= st->index_entries[0].pos;
848
        if(st->index_entries[n-1].pos < first_end)
849
            first_end= st->index_entries[n-1].pos;
850
    }
851
    return last_start > first_end;
852
}
853

    
854
static int avi_load_index(AVFormatContext *s)
855
{
856
    AVIContext *avi = s->priv_data;
857
    ByteIOContext *pb = &s->pb;
858
    uint32_t tag, size;
859
    offset_t pos= url_ftell(pb);
860

    
861
    url_fseek(pb, avi->movi_end, SEEK_SET);
862
#ifdef DEBUG_SEEK
863
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
864
#endif
865
    for(;;) {
866
        if (url_feof(pb))
867
            break;
868
        tag = get_le32(pb);
869
        size = get_le32(pb);
870
#ifdef DEBUG_SEEK
871
        printf("tag=%c%c%c%c size=0x%x\n",
872
               tag & 0xff,
873
               (tag >> 8) & 0xff,
874
               (tag >> 16) & 0xff,
875
               (tag >> 24) & 0xff,
876
               size);
877
#endif
878
        switch(tag) {
879
        case MKTAG('i', 'd', 'x', '1'):
880
            if (avi_read_idx1(s, size) < 0)
881
                goto skip;
882
            else
883
                goto the_end;
884
            break;
885
        default:
886
        skip:
887
            size += (size & 1);
888
            url_fskip(pb, size);
889
            break;
890
        }
891
    }
892
 the_end:
893
    url_fseek(pb, pos, SEEK_SET);
894
    return 0;
895
}
896

    
897
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
898
{
899
    AVIContext *avi = s->priv_data;
900
    AVStream *st;
901
    int i, index;
902
    int64_t pos;
903

    
904
    if (!avi->index_loaded) {
905
        /* we only load the index on demand */
906
        avi_load_index(s);
907
        avi->index_loaded = 1;
908
    }
909
    assert(stream_index>= 0);
910

    
911
    st = s->streams[stream_index];
912
    index= av_index_search_timestamp(st, timestamp, flags);
913
    if(index<0)
914
        return -1;
915

    
916
    /* find the position */
917
    pos = st->index_entries[index].pos;
918
    timestamp = st->index_entries[index].timestamp;
919

    
920
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
921

    
922
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
923
        /* One and only one real stream for DV in AVI, and it has video  */
924
        /* offsets. Calling with other stream indices should have failed */
925
        /* the av_index_search_timestamp call above.                     */
926
        assert(stream_index == 0);
927

    
928
        /* Feed the DV video stream version of the timestamp to the */
929
        /* DV demux so it can synth correct timestamps              */
930
        dv_offset_reset(avi->dv_demux, timestamp);
931

    
932
        url_fseek(&s->pb, pos, SEEK_SET);
933
        avi->stream_index= -1;
934
        return 0;
935
    }
936

    
937
    for(i = 0; i < s->nb_streams; i++) {
938
        AVStream *st2 = s->streams[i];
939
        AVIStream *ast2 = st2->priv_data;
940

    
941
        ast2->packet_size=
942
        ast2->remaining= 0;
943

    
944
        if (st2->nb_index_entries <= 0)
945
            continue;
946

    
947
//        assert(st2->codec->block_align);
948
        assert(st2->time_base.den == ast2->rate);
949
        assert(st2->time_base.num == ast2->scale);
950
        index = av_index_search_timestamp(
951
                st2,
952
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
953
                flags | AVSEEK_FLAG_BACKWARD);
954
        if(index<0)
955
            index=0;
956

    
957
        if(!avi->non_interleaved){
958
            while(index>0 && st2->index_entries[index].pos > pos)
959
                index--;
960
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
961
                index++;
962
        }
963

    
964
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
965
        /* extract the current frame number */
966
        ast2->frame_offset = st2->index_entries[index].timestamp;
967
        if(ast2->sample_size)
968
            ast2->frame_offset *=ast2->sample_size;
969
    }
970

    
971
    /* do the seek */
972
    url_fseek(&s->pb, pos, SEEK_SET);
973
    avi->stream_index= -1;
974
    return 0;
975
}
976

    
977
static int avi_read_close(AVFormatContext *s)
978
{
979
    int i;
980
    AVIContext *avi = s->priv_data;
981

    
982
    for(i=0;i<s->nb_streams;i++) {
983
        AVStream *st = s->streams[i];
984
        AVIStream *ast = st->priv_data;
985
        av_free(ast);
986
        av_free(st->codec->palctrl);
987
    }
988

    
989
    if (avi->dv_demux)
990
        av_free(avi->dv_demux);
991

    
992
    return 0;
993
}
994

    
995
static int avi_probe(AVProbeData *p)
996
{
997
    /* check file header */
998
    if (p->buf_size <= 32)
999
        return 0;
1000
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
1001
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
1002
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
1003
        p->buf[10] == 'I' && (p->buf[11] == ' ' || p->buf[11] == 0x19))
1004
        return AVPROBE_SCORE_MAX;
1005
    else
1006
        return 0;
1007
}
1008

    
1009
AVInputFormat avi_demuxer = {
1010
    "avi",
1011
    "avi format",
1012
    sizeof(AVIContext),
1013
    avi_probe,
1014
    avi_read_header,
1015
    avi_read_packet,
1016
    avi_read_close,
1017
    avi_read_seek,
1018
};