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ffmpeg / libavformat / avidec.c @ b316aa1a

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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
    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 const char avi_headers[][8] = {
61
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
62
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
63
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
64
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
65
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
66
    { 0 }
67
};
68

    
69
static int avi_load_index(AVFormatContext *s);
70
static int guess_ni_flag(AVFormatContext *s);
71

    
72
#ifdef DEBUG
73
static void print_tag(const char *str, unsigned int tag, int size)
74
{
75
    printf("%s: tag=%c%c%c%c size=0x%x\n",
76
           str, tag & 0xff,
77
           (tag >> 8) & 0xff,
78
           (tag >> 16) & 0xff,
79
           (tag >> 24) & 0xff,
80
           size);
81
}
82
#endif
83

    
84
static int get_riff(AVIContext *avi, ByteIOContext *pb)
85
{
86
    char header[8];
87
    int i;
88

    
89
    /* check RIFF header */
90
    get_buffer(pb, header, 4);
91
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
92
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
93
    get_buffer(pb, header+4, 4);
94

    
95
    for(i=0; avi_headers[i][0]; i++)
96
        if(!memcmp(header, avi_headers[i], 8))
97
            break;
98
    if(!avi_headers[i][0])
99
        return -1;
100

    
101
    if(header[7] == 0x19)
102
        av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
103

    
104
    return 0;
105
}
106

    
107
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
108
    AVIContext *avi = s->priv_data;
109
    ByteIOContext *pb = &s->pb;
110
    int longs_pre_entry= get_le16(pb);
111
    int index_sub_type = get_byte(pb);
112
    int index_type     = get_byte(pb);
113
    int entries_in_use = get_le32(pb);
114
    int chunk_id       = get_le32(pb);
115
    int64_t base       = get_le64(pb);
116
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
117
    AVStream *st;
118
    AVIStream *ast;
119
    int i;
120
    int64_t last_pos= -1;
121
    int64_t filesize= url_fsize(&s->pb);
122

    
123
#ifdef DEBUG_SEEK
124
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
125
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
126
#endif
127

    
128
    if(stream_id > s->nb_streams || stream_id < 0)
129
        return -1;
130
    st= s->streams[stream_id];
131
    ast = st->priv_data;
132

    
133
    if(index_sub_type)
134
        return -1;
135

    
136
    get_le32(pb);
137

    
138
    if(index_type && longs_pre_entry != 2)
139
        return -1;
140
    if(index_type>1)
141
        return -1;
142

    
143
    if(filesize > 0 && base >= filesize){
144
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
145
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
146
            base &= 0xFFFFFFFF;
147
        else
148
            return -1;
149
    }
150

    
151
    for(i=0; i<entries_in_use; i++){
152
        if(index_type){
153
            int64_t pos= get_le32(pb) + base - 8;
154
            int len    = get_le32(pb);
155
            int key= len >= 0;
156
            len &= 0x7FFFFFFF;
157

    
158
#ifdef DEBUG_SEEK
159
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
160
#endif
161
            if(last_pos == pos || pos == base - 8)
162
                avi->non_interleaved= 1;
163
            else
164
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
165

    
166
            if(ast->sample_size)
167
                ast->cum_len += len;
168
            else
169
                ast->cum_len ++;
170
            last_pos= pos;
171
        }else{
172
            int64_t offset, pos;
173
            int duration;
174
            offset = get_le64(pb);
175
            get_le32(pb);       /* size */
176
            duration = get_le32(pb);
177
            pos = url_ftell(pb);
178

    
179
            url_fseek(pb, offset+8, SEEK_SET);
180
            read_braindead_odml_indx(s, frame_num);
181
            frame_num += duration;
182

    
183
            url_fseek(pb, pos, SEEK_SET);
184
        }
185
    }
186
    avi->index_loaded=1;
187
    return 0;
188
}
189

    
190
static void clean_index(AVFormatContext *s){
191
    int i;
192
    int64_t j;
193

    
194
    for(i=0; i<s->nb_streams; i++){
195
        AVStream *st = s->streams[i];
196
        AVIStream *ast = st->priv_data;
197
        int n= st->nb_index_entries;
198
        int max= ast->sample_size;
199
        int64_t pos, size, ts;
200

    
201
        if(n != 1 || ast->sample_size==0)
202
            continue;
203

    
204
        while(max < 1024) max+=max;
205

    
206
        pos= st->index_entries[0].pos;
207
        size= st->index_entries[0].size;
208
        ts= st->index_entries[0].timestamp;
209

    
210
        for(j=0; j<size; j+=max){
211
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
212
        }
213
    }
214
}
215

    
216
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
217
{
218
    offset_t i = url_ftell(pb);
219
    size += (size & 1);
220
    get_strz(pb, buf, maxlen);
221
    url_fseek(pb, i+size, SEEK_SET);
222
    return 0;
223
}
224

    
225
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
226
{
227
    AVIContext *avi = s->priv_data;
228
    ByteIOContext *pb = &s->pb;
229
    uint32_t tag, tag1, handler;
230
    int codec_type, stream_index, frame_period, bit_rate;
231
    unsigned int size, nb_frames;
232
    int i;
233
    AVStream *st;
234
    AVIStream *ast = NULL;
235
    char str_track[4];
236
    int avih_width=0, avih_height=0;
237
    int amv_file_format=0;
238

    
239
    avi->stream_index= -1;
240

    
241
    if (get_riff(avi, pb) < 0)
242
        return -1;
243

    
244
    avi->fsize = url_fsize(pb);
245
    if(avi->fsize<=0)
246
        avi->fsize= avi->riff_end;
247

    
248
    /* first list tag */
249
    stream_index = -1;
250
    codec_type = -1;
251
    frame_period = 0;
252
    for(;;) {
253
        if (url_feof(pb))
254
            goto fail;
255
        tag = get_le32(pb);
256
        size = get_le32(pb);
257
#ifdef DEBUG
258
        print_tag("tag", tag, size);
259
#endif
260

    
261
        switch(tag) {
262
        case MKTAG('L', 'I', 'S', 'T'):
263
            /* ignored, except when start of video packets */
264
            tag1 = get_le32(pb);
265
#ifdef DEBUG
266
            print_tag("list", tag1, 0);
267
#endif
268
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
269
                avi->movi_list = url_ftell(pb) - 4;
270
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
271
                else     avi->movi_end = url_fsize(pb);
272
#ifdef DEBUG
273
                printf("movi end=%"PRIx64"\n", avi->movi_end);
274
#endif
275
                goto end_of_header;
276
            }
277
            break;
278
        case MKTAG('d', 'm', 'l', 'h'):
279
            avi->is_odml = 1;
280
            url_fskip(pb, size + (size & 1));
281
            break;
282
        case MKTAG('a', 'm', 'v', 'h'):
283
            amv_file_format=1;
284
        case MKTAG('a', 'v', 'i', 'h'):
285
            /* avi header */
286
            /* using frame_period is bad idea */
287
            frame_period = get_le32(pb);
288
            bit_rate = get_le32(pb) * 8;
289
            get_le32(pb);
290
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
291

    
292
            url_fskip(pb, 2 * 4);
293
            get_le32(pb);
294
            get_le32(pb);
295
            avih_width=get_le32(pb);
296
            avih_height=get_le32(pb);
297

    
298
            url_fskip(pb, size - 10 * 4);
299
            break;
300
        case MKTAG('s', 't', 'r', 'h'):
301
            /* stream header */
302

    
303
            tag1 = get_le32(pb);
304
            handler = get_le32(pb); /* codec tag */
305

    
306
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
307
                url_fskip(pb, size - 8);
308
                break;
309
            }else{
310
                stream_index++;
311
                st = av_new_stream(s, stream_index);
312
                if (!st)
313
                    goto fail;
314

    
315
                ast = av_mallocz(sizeof(AVIStream));
316
                if (!ast)
317
                    goto fail;
318
                st->priv_data = ast;
319
            }
320
            if(amv_file_format)
321
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
322

    
323
#ifdef DEBUG
324
            print_tag("strh", tag1, -1);
325
#endif
326
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
327
                int64_t dv_dur;
328

    
329
                /*
330
                 * After some consideration -- I don't think we
331
                 * have to support anything but DV in a type1 AVIs.
332
                 */
333
                if (s->nb_streams != 1)
334
                    goto fail;
335

    
336
                if (handler != MKTAG('d', 'v', 's', 'd') &&
337
                    handler != MKTAG('d', 'v', 'h', 'd') &&
338
                    handler != MKTAG('d', 'v', 's', 'l'))
339
                   goto fail;
340

    
341
                ast = s->streams[0]->priv_data;
342
                av_freep(&s->streams[0]->codec->extradata);
343
                av_freep(&s->streams[0]);
344
                s->nb_streams = 0;
345
                if (ENABLE_DV_DEMUXER) {
346
                    avi->dv_demux = dv_init_demux(s);
347
                    if (!avi->dv_demux)
348
                        goto fail;
349
                }
350
                s->streams[0]->priv_data = ast;
351
                url_fskip(pb, 3 * 4);
352
                ast->scale = get_le32(pb);
353
                ast->rate = get_le32(pb);
354
                url_fskip(pb, 4);  /* start time */
355

    
356
                dv_dur = get_le32(pb);
357
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
358
                    dv_dur *= AV_TIME_BASE;
359
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
360
                }
361
                /*
362
                 * else, leave duration alone; timing estimation in utils.c
363
                 *      will make a guess based on bit rate.
364
                 */
365

    
366
                stream_index = s->nb_streams - 1;
367
                url_fskip(pb, size - 9*4);
368
                break;
369
            }
370

    
371
            assert(stream_index < s->nb_streams);
372
            st->codec->stream_codec_tag= handler;
373

    
374
            get_le32(pb); /* flags */
375
            get_le16(pb); /* priority */
376
            get_le16(pb); /* language */
377
            get_le32(pb); /* initial frame */
378
            ast->scale = get_le32(pb);
379
            ast->rate = get_le32(pb);
380
            if(ast->scale && ast->rate){
381
            }else if(frame_period){
382
                ast->rate = 1000000;
383
                ast->scale = frame_period;
384
            }else{
385
                ast->rate = 25;
386
                ast->scale = 1;
387
            }
388
            av_set_pts_info(st, 64, ast->scale, ast->rate);
389

    
390
            ast->cum_len=get_le32(pb); /* start */
391
            nb_frames = get_le32(pb);
392

    
393
            st->start_time = 0;
394
            st->duration = nb_frames;
395
            get_le32(pb); /* buffer size */
396
            get_le32(pb); /* quality */
397
            ast->sample_size = get_le32(pb); /* sample ssize */
398
            ast->cum_len *= FFMAX(1, ast->sample_size);
399
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
400

    
401
            switch(tag1) {
402
            case MKTAG('v', 'i', 'd', 's'):
403
                codec_type = CODEC_TYPE_VIDEO;
404

    
405
                ast->sample_size = 0;
406
                break;
407
            case MKTAG('a', 'u', 'd', 's'):
408
                codec_type = CODEC_TYPE_AUDIO;
409
                break;
410
            case MKTAG('t', 'x', 't', 's'):
411
                //FIXME
412
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
413
                break;
414
            default:
415
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
416
                goto fail;
417
            }
418
            ast->frame_offset= ast->cum_len;
419
            url_fskip(pb, size - 12 * 4);
420
            break;
421
        case MKTAG('s', 't', 'r', 'f'):
422
            /* stream header */
423
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
424
                url_fskip(pb, size);
425
            } else {
426
                st = s->streams[stream_index];
427
                switch(codec_type) {
428
                case CODEC_TYPE_VIDEO:
429
                    if(amv_file_format){
430
                        st->codec->width=avih_width;
431
                        st->codec->height=avih_height;
432
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
433
                        st->codec->codec_id = CODEC_ID_AMV;
434
                        url_fskip(pb, size);
435
                        break;
436
                    }
437
                    get_le32(pb); /* size */
438
                    st->codec->width = get_le32(pb);
439
                    st->codec->height = get_le32(pb);
440
                    get_le16(pb); /* panes */
441
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
442
                    tag1 = get_le32(pb);
443
                    get_le32(pb); /* ImageSize */
444
                    get_le32(pb); /* XPelsPerMeter */
445
                    get_le32(pb); /* YPelsPerMeter */
446
                    get_le32(pb); /* ClrUsed */
447
                    get_le32(pb); /* ClrImportant */
448

    
449
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
450
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
451
                        st->codec->codec_tag = tag1;
452
                        st->codec->codec_id = CODEC_ID_XSUB;
453
                        break;
454
                    }
455

    
456
                    if(size > 10*4 && size<(1<<30)){
457
                        st->codec->extradata_size= size - 10*4;
458
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
459
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
460
                    }
461

    
462
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
463
                        get_byte(pb);
464

    
465
                    /* Extract palette from extradata if bpp <= 8 */
466
                    /* This code assumes that extradata contains only palette */
467
                    /* This is true for all paletted codecs implemented in ffmpeg */
468
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
469
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
470
#ifdef WORDS_BIGENDIAN
471
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
472
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
473
#else
474
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
475
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
476
#endif
477
                        st->codec->palctrl->palette_changed = 1;
478
                    }
479

    
480
#ifdef DEBUG
481
                    print_tag("video", tag1, 0);
482
#endif
483
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
484
                    st->codec->codec_tag = tag1;
485
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
486
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
487
//                    url_fskip(pb, size - 5 * 4);
488
                    break;
489
                case CODEC_TYPE_AUDIO:
490
                    get_wav_header(pb, st->codec, size);
491
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
492
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
493
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
494
                        url_fskip(pb, 1);
495
                    /* Force parsing as several audio frames can be in
496
                     * one packet and timestamps refer to packet start*/
497
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
498
                    /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
499
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
500
                        st->need_parsing = AVSTREAM_PARSE_NONE;
501
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
502
                     * audio in the header but have Axan as stream_code_tag. */
503
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
504
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
505
                        st->codec->codec_tag = 0;
506
                    }
507
                    if (amv_file_format)
508
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
509
                    break;
510
                default:
511
                    st->codec->codec_type = CODEC_TYPE_DATA;
512
                    st->codec->codec_id= CODEC_ID_NONE;
513
                    st->codec->codec_tag= 0;
514
                    url_fskip(pb, size);
515
                    break;
516
                }
517
            }
518
            break;
519
        case MKTAG('i', 'n', 'd', 'x'):
520
            i= url_ftell(pb);
521
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
522
                read_braindead_odml_indx(s, 0);
523
            }
524
            url_fseek(pb, i+size, SEEK_SET);
525
            break;
526
        case MKTAG('I', 'N', 'A', 'M'):
527
            avi_read_tag(pb, s->title, sizeof(s->title), size);
528
            break;
529
        case MKTAG('I', 'A', 'R', 'T'):
530
            avi_read_tag(pb, s->author, sizeof(s->author), size);
531
            break;
532
        case MKTAG('I', 'C', 'O', 'P'):
533
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
534
            break;
535
        case MKTAG('I', 'C', 'M', 'T'):
536
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
537
            break;
538
        case MKTAG('I', 'G', 'N', 'R'):
539
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
540
            break;
541
        case MKTAG('I', 'P', 'R', 'D'):
542
            avi_read_tag(pb, s->album, sizeof(s->album), size);
543
            break;
544
        case MKTAG('I', 'P', 'R', 'T'):
545
            avi_read_tag(pb, str_track, sizeof(str_track), size);
546
            sscanf(str_track, "%d", &s->track);
547
            break;
548
        default:
549
            if(size > 1000000){
550
                av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
551
                                        "ill ignore it and try to continue anyway\n");
552
                avi->movi_list = url_ftell(pb) - 4;
553
                avi->movi_end  = url_fsize(pb);
554
                goto end_of_header;
555
            }
556
            /* skip tag */
557
            size += (size & 1);
558
            url_fskip(pb, size);
559
            break;
560
        }
561
    }
562
 end_of_header:
563
    /* check stream number */
564
    if (stream_index != s->nb_streams - 1) {
565
    fail:
566
        for(i=0;i<s->nb_streams;i++) {
567
            av_freep(&s->streams[i]->codec->extradata);
568
            av_freep(&s->streams[i]);
569
        }
570
        return -1;
571
    }
572

    
573
    if(!avi->index_loaded && !url_is_streamed(pb))
574
        avi_load_index(s);
575
    avi->index_loaded = 1;
576
    avi->non_interleaved |= guess_ni_flag(s);
577
    if(avi->non_interleaved)
578
        clean_index(s);
579

    
580
    return 0;
581
}
582

    
583
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
584
{
585
    AVIContext *avi = s->priv_data;
586
    ByteIOContext *pb = &s->pb;
587
    int n, d[8], size;
588
    offset_t i, sync;
589
    void* dstr;
590

    
591
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
592
        size = dv_get_packet(avi->dv_demux, pkt);
593
        if (size >= 0)
594
            return size;
595
    }
596

    
597
    if(avi->non_interleaved){
598
        int best_stream_index = 0;
599
        AVStream *best_st= NULL;
600
        AVIStream *best_ast;
601
        int64_t best_ts= INT64_MAX;
602
        int i;
603

    
604
        for(i=0; i<s->nb_streams; i++){
605
            AVStream *st = s->streams[i];
606
            AVIStream *ast = st->priv_data;
607
            int64_t ts= ast->frame_offset;
608

    
609
            if(ast->sample_size)
610
                ts /= ast->sample_size;
611
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
612

    
613
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
614
            if(ts < best_ts){
615
                best_ts= ts;
616
                best_st= st;
617
                best_stream_index= i;
618
            }
619
        }
620
        best_ast = best_st->priv_data;
621
        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
622
        if(best_ast->remaining)
623
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
624
        else
625
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
626

    
627
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
628
        if(i>=0){
629
            int64_t pos= best_st->index_entries[i].pos;
630
            pos += best_ast->packet_size - best_ast->remaining;
631
            url_fseek(&s->pb, pos + 8, SEEK_SET);
632
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
633

    
634
            assert(best_ast->remaining <= best_ast->packet_size);
635

    
636
            avi->stream_index= best_stream_index;
637
            if(!best_ast->remaining)
638
                best_ast->packet_size=
639
                best_ast->remaining= best_st->index_entries[i].size;
640
        }
641
    }
642

    
643
resync:
644
    if(avi->stream_index >= 0){
645
        AVStream *st= s->streams[ avi->stream_index ];
646
        AVIStream *ast= st->priv_data;
647
        int size;
648

    
649
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
650
            size= INT_MAX;
651
        else if(ast->sample_size < 32)
652
            size= 64*ast->sample_size;
653
        else
654
            size= ast->sample_size;
655

    
656
        if(size > ast->remaining)
657
            size= ast->remaining;
658
        av_get_packet(pb, pkt, size);
659

    
660
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
661
            dstr = pkt->destruct;
662
            size = dv_produce_packet(avi->dv_demux, pkt,
663
                                    pkt->data, pkt->size);
664
            pkt->destruct = dstr;
665
            pkt->flags |= PKT_FLAG_KEY;
666
        } else {
667
            /* XXX: how to handle B frames in avi ? */
668
            pkt->dts = ast->frame_offset;
669
//                pkt->dts += ast->start;
670
            if(ast->sample_size)
671
                pkt->dts /= ast->sample_size;
672
//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);
673
            pkt->stream_index = avi->stream_index;
674

    
675
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
676
                AVIndexEntry *e;
677
                int index;
678
                assert(st->index_entries);
679

    
680
                index= av_index_search_timestamp(st, pkt->dts, 0);
681
                e= &st->index_entries[index];
682

    
683
                if(index >= 0 && e->timestamp == ast->frame_offset){
684
                    if (e->flags & AVINDEX_KEYFRAME)
685
                        pkt->flags |= PKT_FLAG_KEY;
686
                }
687
            } else {
688
                pkt->flags |= PKT_FLAG_KEY;
689
            }
690
            if(ast->sample_size)
691
                ast->frame_offset += pkt->size;
692
            else
693
                ast->frame_offset++;
694
        }
695
        ast->remaining -= size;
696
        if(!ast->remaining){
697
            avi->stream_index= -1;
698
            ast->packet_size= 0;
699
        }
700

    
701
        return size;
702
    }
703

    
704
    memset(d, -1, sizeof(int)*8);
705
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
706
        int j;
707

    
708
        for(j=0; j<7; j++)
709
            d[j]= d[j+1];
710
        d[7]= get_byte(pb);
711

    
712
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
713

    
714
        if(    d[2] >= '0' && d[2] <= '9'
715
            && d[3] >= '0' && d[3] <= '9'){
716
            n= (d[2] - '0') * 10 + (d[3] - '0');
717
        }else{
718
            n= 100; //invalid stream id
719
        }
720
//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);
721
        if(i + size > avi->fsize || d[0]<0)
722
            continue;
723

    
724
        //parse ix##
725
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
726
        //parse JUNK
727
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
728
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
729
            url_fskip(pb, size);
730
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
731
            goto resync;
732
        }
733

    
734
        if(    d[0] >= '0' && d[0] <= '9'
735
            && d[1] >= '0' && d[1] <= '9'){
736
            n= (d[0] - '0') * 10 + (d[1] - '0');
737
        }else{
738
            n= 100; //invalid stream id
739
        }
740

    
741
        //parse ##dc/##wb
742
        if(n < s->nb_streams){
743
          AVStream *st;
744
          AVIStream *ast;
745
          st = s->streams[n];
746
          ast = st->priv_data;
747

    
748
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
749
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
750
             || st->discard >= AVDISCARD_ALL){
751
                if(ast->sample_size) ast->frame_offset += pkt->size;
752
                else                 ast->frame_offset++;
753
                url_fskip(pb, size);
754
                goto resync;
755
          }
756

    
757
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
758
                d[2]*256+d[3] == ast->prefix /*||
759
                (d[2] == 'd' && d[3] == 'c') ||
760
                (d[2] == 'w' && d[3] == 'b')*/) {
761

    
762
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
763
            if(d[2]*256+d[3] == ast->prefix)
764
                ast->prefix_count++;
765
            else{
766
                ast->prefix= d[2]*256+d[3];
767
                ast->prefix_count= 0;
768
            }
769

    
770
            avi->stream_index= n;
771
            ast->packet_size= size + 8;
772
            ast->remaining= size;
773

    
774
            {
775
                uint64_t pos= url_ftell(pb) - 8;
776
                if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
777
                    av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
778
                }
779
            }
780
            goto resync;
781
          }
782
        }
783
        /* palette changed chunk */
784
        if (   d[0] >= '0' && d[0] <= '9'
785
            && d[1] >= '0' && d[1] <= '9'
786
            && ((d[2] == 'p' && d[3] == 'c'))
787
            && n < s->nb_streams && i + size <= avi->fsize) {
788

    
789
            AVStream *st;
790
            int first, clr, flags, k, p;
791

    
792
            st = s->streams[n];
793

    
794
            first = get_byte(pb);
795
            clr = get_byte(pb);
796
            if(!clr) /* all 256 colors used */
797
                clr = 256;
798
            flags = get_le16(pb);
799
            p = 4;
800
            for (k = first; k < clr + first; k++) {
801
                int r, g, b;
802
                r = get_byte(pb);
803
                g = get_byte(pb);
804
                b = get_byte(pb);
805
                    get_byte(pb);
806
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
807
            }
808
            st->codec->palctrl->palette_changed = 1;
809
            goto resync;
810
        }
811

    
812
    }
813

    
814
    return -1;
815
}
816

    
817
/* XXX: we make the implicit supposition that the position are sorted
818
   for each stream */
819
static int avi_read_idx1(AVFormatContext *s, int size)
820
{
821
    AVIContext *avi = s->priv_data;
822
    ByteIOContext *pb = &s->pb;
823
    int nb_index_entries, i;
824
    AVStream *st;
825
    AVIStream *ast;
826
    unsigned int index, tag, flags, pos, len;
827
    unsigned last_pos= -1;
828

    
829
    nb_index_entries = size / 16;
830
    if (nb_index_entries <= 0)
831
        return -1;
832

    
833
    /* read the entries and sort them in each stream component */
834
    for(i = 0; i < nb_index_entries; i++) {
835
        tag = get_le32(pb);
836
        flags = get_le32(pb);
837
        pos = get_le32(pb);
838
        len = get_le32(pb);
839
#if defined(DEBUG_SEEK)
840
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
841
               i, tag, flags, pos, len);
842
#endif
843
        if(i==0 && pos > avi->movi_list)
844
            avi->movi_list= 0; //FIXME better check
845
        pos += avi->movi_list;
846

    
847
        index = ((tag & 0xff) - '0') * 10;
848
        index += ((tag >> 8) & 0xff) - '0';
849
        if (index >= s->nb_streams)
850
            continue;
851
        st = s->streams[index];
852
        ast = st->priv_data;
853

    
854
#if defined(DEBUG_SEEK)
855
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
856
#endif
857
        if(last_pos == pos)
858
            avi->non_interleaved= 1;
859
        else
860
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
861
        if(ast->sample_size)
862
            ast->cum_len += len;
863
        else
864
            ast->cum_len ++;
865
        last_pos= pos;
866
    }
867
    return 0;
868
}
869

    
870
static int guess_ni_flag(AVFormatContext *s){
871
    int i;
872
    int64_t last_start=0;
873
    int64_t first_end= INT64_MAX;
874

    
875
    for(i=0; i<s->nb_streams; i++){
876
        AVStream *st = s->streams[i];
877
        int n= st->nb_index_entries;
878

    
879
        if(n <= 0)
880
            continue;
881

    
882
        if(st->index_entries[0].pos > last_start)
883
            last_start= st->index_entries[0].pos;
884
        if(st->index_entries[n-1].pos < first_end)
885
            first_end= st->index_entries[n-1].pos;
886
    }
887
    return last_start > first_end;
888
}
889

    
890
static int avi_load_index(AVFormatContext *s)
891
{
892
    AVIContext *avi = s->priv_data;
893
    ByteIOContext *pb = &s->pb;
894
    uint32_t tag, size;
895
    offset_t pos= url_ftell(pb);
896

    
897
    url_fseek(pb, avi->movi_end, SEEK_SET);
898
#ifdef DEBUG_SEEK
899
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
900
#endif
901
    for(;;) {
902
        if (url_feof(pb))
903
            break;
904
        tag = get_le32(pb);
905
        size = get_le32(pb);
906
#ifdef DEBUG_SEEK
907
        printf("tag=%c%c%c%c size=0x%x\n",
908
               tag & 0xff,
909
               (tag >> 8) & 0xff,
910
               (tag >> 16) & 0xff,
911
               (tag >> 24) & 0xff,
912
               size);
913
#endif
914
        switch(tag) {
915
        case MKTAG('i', 'd', 'x', '1'):
916
            if (avi_read_idx1(s, size) < 0)
917
                goto skip;
918
            else
919
                goto the_end;
920
            break;
921
        default:
922
        skip:
923
            size += (size & 1);
924
            url_fskip(pb, size);
925
            break;
926
        }
927
    }
928
 the_end:
929
    url_fseek(pb, pos, SEEK_SET);
930
    return 0;
931
}
932

    
933
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
934
{
935
    AVIContext *avi = s->priv_data;
936
    AVStream *st;
937
    int i, index;
938
    int64_t pos;
939

    
940
    if (!avi->index_loaded) {
941
        /* we only load the index on demand */
942
        avi_load_index(s);
943
        avi->index_loaded = 1;
944
    }
945
    assert(stream_index>= 0);
946

    
947
    st = s->streams[stream_index];
948
    index= av_index_search_timestamp(st, timestamp, flags);
949
    if(index<0)
950
        return -1;
951

    
952
    /* find the position */
953
    pos = st->index_entries[index].pos;
954
    timestamp = st->index_entries[index].timestamp;
955

    
956
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
957

    
958
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
959
        /* One and only one real stream for DV in AVI, and it has video  */
960
        /* offsets. Calling with other stream indices should have failed */
961
        /* the av_index_search_timestamp call above.                     */
962
        assert(stream_index == 0);
963

    
964
        /* Feed the DV video stream version of the timestamp to the */
965
        /* DV demux so it can synth correct timestamps              */
966
        dv_offset_reset(avi->dv_demux, timestamp);
967

    
968
        url_fseek(&s->pb, pos, SEEK_SET);
969
        avi->stream_index= -1;
970
        return 0;
971
    }
972

    
973
    for(i = 0; i < s->nb_streams; i++) {
974
        AVStream *st2 = s->streams[i];
975
        AVIStream *ast2 = st2->priv_data;
976

    
977
        ast2->packet_size=
978
        ast2->remaining= 0;
979

    
980
        if (st2->nb_index_entries <= 0)
981
            continue;
982

    
983
//        assert(st2->codec->block_align);
984
        assert(st2->time_base.den == ast2->rate);
985
        assert(st2->time_base.num == ast2->scale);
986
        index = av_index_search_timestamp(
987
                st2,
988
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
989
                flags | AVSEEK_FLAG_BACKWARD);
990
        if(index<0)
991
            index=0;
992

    
993
        if(!avi->non_interleaved){
994
            while(index>0 && st2->index_entries[index].pos > pos)
995
                index--;
996
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
997
                index++;
998
        }
999

    
1000
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1001
        /* extract the current frame number */
1002
        ast2->frame_offset = st2->index_entries[index].timestamp;
1003
        if(ast2->sample_size)
1004
            ast2->frame_offset *=ast2->sample_size;
1005
    }
1006

    
1007
    /* do the seek */
1008
    url_fseek(&s->pb, pos, SEEK_SET);
1009
    avi->stream_index= -1;
1010
    return 0;
1011
}
1012

    
1013
static int avi_read_close(AVFormatContext *s)
1014
{
1015
    int i;
1016
    AVIContext *avi = s->priv_data;
1017

    
1018
    for(i=0;i<s->nb_streams;i++) {
1019
        AVStream *st = s->streams[i];
1020
        AVIStream *ast = st->priv_data;
1021
        av_free(ast);
1022
        av_free(st->codec->palctrl);
1023
    }
1024

    
1025
    if (avi->dv_demux)
1026
        av_free(avi->dv_demux);
1027

    
1028
    return 0;
1029
}
1030

    
1031
static int avi_probe(AVProbeData *p)
1032
{
1033
    int i;
1034

    
1035
    /* check file header */
1036
    for(i=0; avi_headers[i][0]; i++)
1037
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1038
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1039
            return AVPROBE_SCORE_MAX;
1040

    
1041
    return 0;
1042
}
1043

    
1044
AVInputFormat avi_demuxer = {
1045
    "avi",
1046
    "avi format",
1047
    sizeof(AVIContext),
1048
    avi_probe,
1049
    avi_read_header,
1050
    avi_read_packet,
1051
    avi_read_close,
1052
    avi_read_seek,
1053
};