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ffmpeg / libavformat / avidec.c @ 20cd83e2

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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', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
86
        return -1;
87

    
88
    return 0;
89
}
90

    
91
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
92
    AVIContext *avi = s->priv_data;
93
    ByteIOContext *pb = &s->pb;
94
    int longs_pre_entry= get_le16(pb);
95
    int index_sub_type = get_byte(pb);
96
    int index_type     = get_byte(pb);
97
    int entries_in_use = get_le32(pb);
98
    int chunk_id       = get_le32(pb);
99
    int64_t base       = get_le64(pb);
100
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
101
    AVStream *st;
102
    AVIStream *ast;
103
    int i;
104
    int64_t last_pos= -1;
105
    int64_t filesize= url_fsize(&s->pb);
106

    
107
#ifdef DEBUG_SEEK
108
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16LX\n",
109
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
110
#endif
111

    
112
    if(stream_id > s->nb_streams || stream_id < 0)
113
        return -1;
114
    st= s->streams[stream_id];
115
    ast = st->priv_data;
116

    
117
    if(index_sub_type)
118
        return -1;
119

    
120
    get_le32(pb);
121

    
122
    if(index_type && longs_pre_entry != 2)
123
        return -1;
124
    if(index_type>1)
125
        return -1;
126

    
127
    if(filesize > 0 && base >= filesize){
128
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
129
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
130
            base &= 0xFFFFFFFF;
131
        else
132
            return -1;
133
    }
134

    
135
    for(i=0; i<entries_in_use; i++){
136
        if(index_type){
137
            int64_t pos= get_le32(pb) + base - 8;
138
            int len    = get_le32(pb);
139
            int key= len >= 0;
140
            len &= 0x7FFFFFFF;
141

    
142
#ifdef DEBUG_SEEK
143
            av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
144
#endif
145
            if(last_pos == pos || pos == base - 8)
146
                avi->non_interleaved= 1;
147
            else
148
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
149

    
150
            if(ast->sample_size)
151
                ast->cum_len += len / ast->sample_size;
152
            else
153
                ast->cum_len ++;
154
            last_pos= pos;
155
        }else{
156
            int64_t offset, pos;
157
            int duration;
158
            offset = get_le64(pb);
159
            get_le32(pb);       /* size */
160
            duration = get_le32(pb);
161
            pos = url_ftell(pb);
162

    
163
            url_fseek(pb, offset+8, SEEK_SET);
164
            read_braindead_odml_indx(s, frame_num);
165
            frame_num += duration;
166

    
167
            url_fseek(pb, pos, SEEK_SET);
168
        }
169
    }
170
    avi->index_loaded=1;
171
    return 0;
172
}
173

    
174
static void clean_index(AVFormatContext *s){
175
    int i;
176
    int64_t j;
177

    
178
    for(i=0; i<s->nb_streams; i++){
179
        AVStream *st = s->streams[i];
180
        AVIStream *ast = st->priv_data;
181
        int n= st->nb_index_entries;
182
        int max= ast->sample_size;
183
        int64_t pos, size, ts;
184

    
185
        if(n != 1 || ast->sample_size==0)
186
            continue;
187

    
188
        while(max < 1024) max+=max;
189

    
190
        pos= st->index_entries[0].pos;
191
        size= st->index_entries[0].size;
192
        ts= st->index_entries[0].timestamp;
193

    
194
        for(j=0; j<size; j+=max){
195
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
196
        }
197
    }
198
}
199

    
200
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
201
{
202
    offset_t i = url_ftell(pb);
203
    size += (size & 1);
204
    get_strz(pb, buf, maxlen);
205
    url_fseek(pb, i+size, SEEK_SET);
206
    return 0;
207
}
208

    
209
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
210
{
211
    AVIContext *avi = s->priv_data;
212
    ByteIOContext *pb = &s->pb;
213
    uint32_t tag, tag1, handler;
214
    int codec_type, stream_index, frame_period, bit_rate;
215
    unsigned int size, nb_frames;
216
    int i, n;
217
    AVStream *st;
218
    AVIStream *ast = NULL;
219
    int xan_video = 0;  /* hack to support Xan A/V */
220
    char str_track[4];
221

    
222
    avi->stream_index= -1;
223

    
224
    if (get_riff(avi, pb) < 0)
225
        return -1;
226

    
227
    /* first list tag */
228
    stream_index = -1;
229
    codec_type = -1;
230
    frame_period = 0;
231
    for(;;) {
232
        if (url_feof(pb))
233
            goto fail;
234
        tag = get_le32(pb);
235
        size = get_le32(pb);
236
#ifdef DEBUG
237
        print_tag("tag", tag, size);
238
#endif
239

    
240
        switch(tag) {
241
        case MKTAG('L', 'I', 'S', 'T'):
242
            /* ignored, except when start of video packets */
243
            tag1 = get_le32(pb);
244
#ifdef DEBUG
245
            print_tag("list", tag1, 0);
246
#endif
247
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
248
                avi->movi_list = url_ftell(pb) - 4;
249
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
250
                else     avi->movi_end = url_fsize(pb);
251
#ifdef DEBUG
252
                printf("movi end=%Lx\n", avi->movi_end);
253
#endif
254
                goto end_of_header;
255
            }
256
            break;
257
        case MKTAG('d', 'm', 'l', 'h'):
258
            avi->is_odml = 1;
259
            url_fskip(pb, size + (size & 1));
260
            break;
261
        case MKTAG('a', 'v', 'i', 'h'):
262
            /* avi header */
263
            /* using frame_period is bad idea */
264
            frame_period = get_le32(pb);
265
            bit_rate = get_le32(pb) * 8;
266
            get_le32(pb);
267
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
268

    
269
            url_fskip(pb, 2 * 4);
270
            n = get_le32(pb);
271
            for(i=0;i<n;i++) {
272
                AVIStream *ast;
273
                st = av_new_stream(s, i);
274
                if (!st)
275
                    goto fail;
276

    
277
                ast = av_mallocz(sizeof(AVIStream));
278
                if (!ast)
279
                    goto fail;
280
                st->priv_data = ast;
281
            }
282
            url_fskip(pb, size - 7 * 4);
283
            break;
284
        case MKTAG('s', 't', 'r', 'h'):
285
            /* stream header */
286
            stream_index++;
287
            tag1 = get_le32(pb);
288
            handler = get_le32(pb); /* codec tag */
289
#ifdef DEBUG
290
        print_tag("strh", tag1, -1);
291
#endif
292
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
293
                /*
294
                 * After some consideration -- I don't think we
295
                 * have to support anything but DV in a type1 AVIs.
296
                 */
297
                if (s->nb_streams != 1)
298
                    goto fail;
299

    
300
                if (handler != MKTAG('d', 'v', 's', 'd') &&
301
                    handler != MKTAG('d', 'v', 'h', 'd') &&
302
                    handler != MKTAG('d', 'v', 's', 'l'))
303
                   goto fail;
304

    
305
                ast = s->streams[0]->priv_data;
306
                av_freep(&s->streams[0]->codec->extradata);
307
                av_freep(&s->streams[0]);
308
                s->nb_streams = 0;
309
                avi->dv_demux = dv_init_demux(s);
310
                if (!avi->dv_demux)
311
                    goto fail;
312
                s->streams[0]->priv_data = ast;
313
                url_fskip(pb, 3 * 4);
314
                ast->scale = get_le32(pb);
315
                ast->rate = get_le32(pb);
316
                stream_index = s->nb_streams - 1;
317
                url_fskip(pb, size - 7*4);
318
                break;
319
            }
320

    
321
            if (stream_index >= s->nb_streams) {
322
                url_fskip(pb, size - 8);
323
                /* ignore padding stream */
324
                if (tag1 == MKTAG('p', 'a', 'd', 's'))
325
                    stream_index--;
326
                break;
327
            }
328
            st = s->streams[stream_index];
329
            ast = st->priv_data;
330
            st->codec->stream_codec_tag= handler;
331

    
332
            get_le32(pb); /* flags */
333
            get_le16(pb); /* priority */
334
            get_le16(pb); /* language */
335
            get_le32(pb); /* initial frame */
336
            ast->scale = get_le32(pb);
337
            ast->rate = get_le32(pb);
338
            if(ast->scale && ast->rate){
339
            }else if(frame_period){
340
                ast->rate = 1000000;
341
                ast->scale = frame_period;
342
            }else{
343
                ast->rate = 25;
344
                ast->scale = 1;
345
            }
346
            av_set_pts_info(st, 64, ast->scale, ast->rate);
347

    
348
            ast->cum_len=get_le32(pb); /* start */
349
            nb_frames = get_le32(pb);
350

    
351
            st->start_time = 0;
352
            st->duration = nb_frames;
353
            get_le32(pb); /* buffer size */
354
            get_le32(pb); /* quality */
355
            ast->sample_size = get_le32(pb); /* sample ssize */
356
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
357

    
358
            switch(tag1) {
359
            case MKTAG('v', 'i', 'd', 's'):
360
                codec_type = CODEC_TYPE_VIDEO;
361

    
362
                ast->sample_size = 0;
363
                break;
364
            case MKTAG('a', 'u', 'd', 's'):
365
                codec_type = CODEC_TYPE_AUDIO;
366
                break;
367
            case MKTAG('t', 'x', 't', 's'):
368
                //FIXME
369
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
370
                break;
371
            case MKTAG('p', 'a', 'd', 's'):
372
                codec_type = CODEC_TYPE_UNKNOWN;
373
                stream_index--;
374
                break;
375
            default:
376
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
377
                goto fail;
378
            }
379
            ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
380
            url_fskip(pb, size - 12 * 4);
381
            break;
382
        case MKTAG('s', 't', 'r', 'f'):
383
            /* stream header */
384
            if (stream_index >= s->nb_streams || avi->dv_demux) {
385
                url_fskip(pb, size);
386
            } else {
387
                st = s->streams[stream_index];
388
                switch(codec_type) {
389
                case CODEC_TYPE_VIDEO:
390
                    get_le32(pb); /* size */
391
                    st->codec->width = get_le32(pb);
392
                    st->codec->height = get_le32(pb);
393
                    get_le16(pb); /* panes */
394
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
395
                    tag1 = get_le32(pb);
396
                    get_le32(pb); /* ImageSize */
397
                    get_le32(pb); /* XPelsPerMeter */
398
                    get_le32(pb); /* YPelsPerMeter */
399
                    get_le32(pb); /* ClrUsed */
400
                    get_le32(pb); /* ClrImportant */
401

    
402
                 if(size > 10*4 && size<(1<<30)){
403
                    st->codec->extradata_size= size - 10*4;
404
                    st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
405
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
406
                 }
407

    
408
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
409
                        get_byte(pb);
410

    
411
                    /* Extract palette from extradata if bpp <= 8 */
412
                    /* This code assumes that extradata contains only palette */
413
                    /* This is true for all paletted codecs implemented in ffmpeg */
414
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
415
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
416
#ifdef WORDS_BIGENDIAN
417
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
418
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
419
#else
420
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
421
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
422
#endif
423
                        st->codec->palctrl->palette_changed = 1;
424
                    }
425

    
426
#ifdef DEBUG
427
                    print_tag("video", tag1, 0);
428
#endif
429
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
430
                    st->codec->codec_tag = tag1;
431
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
432
                    if (st->codec->codec_id == CODEC_ID_XAN_WC4)
433
                        xan_video = 1;
434
                    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
435
//                    url_fskip(pb, size - 5 * 4);
436
                    break;
437
                case CODEC_TYPE_AUDIO:
438
                    get_wav_header(pb, st->codec, size);
439
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
440
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
441
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
442
                        url_fskip(pb, 1);
443
                    /* special case time: To support Xan DPCM, hardcode
444
                     * the format if Xxan is the video codec */
445
                    st->need_parsing = 1;
446
                    /* force parsing as several audio frames can be in
447
                       one packet */
448
                    if (xan_video)
449
                        st->codec->codec_id = CODEC_ID_XAN_DPCM;
450
                    break;
451
                default:
452
                    st->codec->codec_type = CODEC_TYPE_DATA;
453
                    st->codec->codec_id= CODEC_ID_NONE;
454
                    st->codec->codec_tag= 0;
455
                    url_fskip(pb, size);
456
                    break;
457
                }
458
            }
459
            break;
460
        case MKTAG('i', 'n', 'd', 'x'):
461
            i= url_ftell(pb);
462
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
463
                read_braindead_odml_indx(s, 0);
464
            }
465
            url_fseek(pb, i+size, SEEK_SET);
466
            break;
467
        case MKTAG('I', 'N', 'A', 'M'):
468
            avi_read_tag(pb, s->title, sizeof(s->title), size);
469
            break;
470
        case MKTAG('I', 'A', 'R', 'T'):
471
            avi_read_tag(pb, s->author, sizeof(s->author), size);
472
            break;
473
        case MKTAG('I', 'C', 'O', 'P'):
474
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
475
            break;
476
        case MKTAG('I', 'C', 'M', 'T'):
477
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
478
            break;
479
        case MKTAG('I', 'G', 'N', 'R'):
480
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
481
            break;
482
        case MKTAG('I', 'P', 'R', 'D'):
483
            avi_read_tag(pb, s->album, sizeof(s->album), size);
484
            break;
485
        case MKTAG('I', 'P', 'R', 'T'):
486
            avi_read_tag(pb, str_track, sizeof(str_track), size);
487
            sscanf(str_track, "%d", &s->track);
488
            break;
489
        default:
490
            /* skip tag */
491
            size += (size & 1);
492
            url_fskip(pb, size);
493
            break;
494
        }
495
    }
496
 end_of_header:
497
    /* check stream number */
498
    if (stream_index != s->nb_streams - 1) {
499
    fail:
500
        for(i=0;i<s->nb_streams;i++) {
501
            av_freep(&s->streams[i]->codec->extradata);
502
            av_freep(&s->streams[i]);
503
        }
504
        return -1;
505
    }
506

    
507
    if(!avi->index_loaded && !url_is_streamed(pb))
508
        avi_load_index(s);
509
    avi->index_loaded = 1;
510
    avi->non_interleaved |= guess_ni_flag(s);
511
    if(avi->non_interleaved)
512
        clean_index(s);
513

    
514
    return 0;
515
}
516

    
517
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
518
{
519
    AVIContext *avi = s->priv_data;
520
    ByteIOContext *pb = &s->pb;
521
    int n, d[8], size;
522
    offset_t i, sync;
523
    void* dstr;
524

    
525
    if (avi->dv_demux) {
526
        size = dv_get_packet(avi->dv_demux, pkt);
527
        if (size >= 0)
528
            return size;
529
    }
530

    
531
    if(avi->non_interleaved){
532
        int best_stream_index = 0;
533
        AVStream *best_st= NULL;
534
        AVIStream *best_ast;
535
        int64_t best_ts= INT64_MAX;
536
        int i;
537

    
538
        for(i=0; i<s->nb_streams; i++){
539
            AVStream *st = s->streams[i];
540
            AVIStream *ast = st->priv_data;
541
            int64_t ts= ast->frame_offset;
542

    
543
            if(ast->sample_size)
544
                ts /= ast->sample_size;
545
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
546

    
547
//            av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
548
            if(ts < best_ts){
549
                best_ts= ts;
550
                best_st= st;
551
                best_stream_index= i;
552
            }
553
        }
554
        best_ast = best_st->priv_data;
555
        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
556
        if(best_ast->remaining)
557
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
558
        else
559
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
560

    
561
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
562
        if(i>=0){
563
            int64_t pos= best_st->index_entries[i].pos;
564
            pos += best_ast->packet_size - best_ast->remaining;
565
            url_fseek(&s->pb, pos + 8, SEEK_SET);
566
//        av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
567

    
568
            assert(best_ast->remaining <= best_ast->packet_size);
569

    
570
            avi->stream_index= best_stream_index;
571
            if(!best_ast->remaining)
572
                best_ast->packet_size=
573
                best_ast->remaining= best_st->index_entries[i].size;
574
        }
575
    }
576

    
577
resync:
578
    if(avi->stream_index >= 0){
579
        AVStream *st= s->streams[ avi->stream_index ];
580
        AVIStream *ast= st->priv_data;
581
        int size;
582

    
583
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
584
            size= INT_MAX;
585
        else if(ast->sample_size < 32)
586
            size= 64*ast->sample_size;
587
        else
588
            size= ast->sample_size;
589

    
590
        if(size > ast->remaining)
591
            size= ast->remaining;
592
        av_get_packet(pb, pkt, size);
593

    
594
        if (avi->dv_demux) {
595
            dstr = pkt->destruct;
596
            size = dv_produce_packet(avi->dv_demux, pkt,
597
                                    pkt->data, pkt->size);
598
            pkt->destruct = dstr;
599
            pkt->flags |= PKT_FLAG_KEY;
600
        } else {
601
            /* XXX: how to handle B frames in avi ? */
602
            pkt->dts = ast->frame_offset;
603
//                pkt->dts += ast->start;
604
            if(ast->sample_size)
605
                pkt->dts /= ast->sample_size;
606
//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%Ld %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);
607
            pkt->stream_index = avi->stream_index;
608

    
609
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
610
                if(st->index_entries){
611
                    AVIndexEntry *e;
612
                    int index;
613

    
614
                    index= av_index_search_timestamp(st, pkt->dts, 0);
615
                    e= &st->index_entries[index];
616

    
617
                    if(index >= 0 && e->timestamp == ast->frame_offset){
618
                        if (e->flags & AVINDEX_KEYFRAME)
619
                            pkt->flags |= PKT_FLAG_KEY;
620
                    }
621
                } else {
622
                    /* if no index, better to say that all frames
623
                        are key frames */
624
                    pkt->flags |= PKT_FLAG_KEY;
625
                }
626
            } else {
627
                pkt->flags |= PKT_FLAG_KEY;
628
            }
629
            if(ast->sample_size)
630
                ast->frame_offset += pkt->size;
631
            else
632
                ast->frame_offset++;
633
        }
634
        ast->remaining -= size;
635
        if(!ast->remaining){
636
            avi->stream_index= -1;
637
            ast->packet_size= 0;
638
            if (size & 1) {
639
                get_byte(pb);
640
                size++;
641
            }
642
        }
643

    
644
        return size;
645
    }
646

    
647
    memset(d, -1, sizeof(int)*8);
648
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
649
        int j;
650

    
651
        if (i >= avi->movi_end) {
652
            if (avi->is_odml) {
653
                url_fskip(pb, avi->riff_end - i);
654
                avi->riff_end = avi->movi_end = url_fsize(pb);
655
            } else
656
                break;
657
        }
658

    
659
        for(j=0; j<7; j++)
660
            d[j]= d[j+1];
661
        d[7]= get_byte(pb);
662

    
663
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
664

    
665
        if(    d[2] >= '0' && d[2] <= '9'
666
            && d[3] >= '0' && d[3] <= '9'){
667
            n= (d[2] - '0') * 10 + (d[3] - '0');
668
        }else{
669
            n= 100; //invalid stream id
670
        }
671
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
672
        if(i + size > avi->movi_end || d[0]<0)
673
            continue;
674

    
675
        //parse ix##
676
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
677
        //parse JUNK
678
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
679
            url_fskip(pb, size);
680
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
681
            goto resync;
682
        }
683

    
684
        if(    d[0] >= '0' && d[0] <= '9'
685
            && d[1] >= '0' && d[1] <= '9'){
686
            n= (d[0] - '0') * 10 + (d[1] - '0');
687
        }else{
688
            n= 100; //invalid stream id
689
        }
690

    
691
        //parse ##dc/##wb
692
        if(n < s->nb_streams){
693
          AVStream *st;
694
          AVIStream *ast;
695
          st = s->streams[n];
696
          ast = st->priv_data;
697

    
698
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
699
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
700
             || st->discard >= AVDISCARD_ALL){
701
                if(ast->sample_size) ast->frame_offset += pkt->size;
702
                else                 ast->frame_offset++;
703
                url_fskip(pb, size);
704
                goto resync;
705
          }
706

    
707
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
708
                d[2]*256+d[3] == ast->prefix /*||
709
                (d[2] == 'd' && d[3] == 'c') ||
710
                (d[2] == 'w' && d[3] == 'b')*/) {
711

    
712
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
713
            if(d[2]*256+d[3] == ast->prefix)
714
                ast->prefix_count++;
715
            else{
716
                ast->prefix= d[2]*256+d[3];
717
                ast->prefix_count= 0;
718
            }
719

    
720
            avi->stream_index= n;
721
            ast->packet_size= size + 8;
722
            ast->remaining= size;
723
            goto resync;
724
          }
725
        }
726
        /* palette changed chunk */
727
        if (   d[0] >= '0' && d[0] <= '9'
728
            && d[1] >= '0' && d[1] <= '9'
729
            && ((d[2] == 'p' && d[3] == 'c'))
730
            && n < s->nb_streams && i + size <= avi->movi_end) {
731

    
732
            AVStream *st;
733
            int first, clr, flags, k, p;
734

    
735
            st = s->streams[n];
736

    
737
            first = get_byte(pb);
738
            clr = get_byte(pb);
739
            if(!clr) /* all 256 colors used */
740
                clr = 256;
741
            flags = get_le16(pb);
742
            p = 4;
743
            for (k = first; k < clr + first; k++) {
744
                int r, g, b;
745
                r = get_byte(pb);
746
                g = get_byte(pb);
747
                b = get_byte(pb);
748
                    get_byte(pb);
749
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
750
            }
751
            st->codec->palctrl->palette_changed = 1;
752
            goto resync;
753
        }
754

    
755
    }
756

    
757
    return -1;
758
}
759

    
760
/* XXX: we make the implicit supposition that the position are sorted
761
   for each stream */
762
static int avi_read_idx1(AVFormatContext *s, int size)
763
{
764
    AVIContext *avi = s->priv_data;
765
    ByteIOContext *pb = &s->pb;
766
    int nb_index_entries, i;
767
    AVStream *st;
768
    AVIStream *ast;
769
    unsigned int index, tag, flags, pos, len;
770
    unsigned last_pos= -1;
771

    
772
    nb_index_entries = size / 16;
773
    if (nb_index_entries <= 0)
774
        return -1;
775

    
776
    /* read the entries and sort them in each stream component */
777
    for(i = 0; i < nb_index_entries; i++) {
778
        tag = get_le32(pb);
779
        flags = get_le32(pb);
780
        pos = get_le32(pb);
781
        len = get_le32(pb);
782
#if defined(DEBUG_SEEK)
783
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
784
               i, tag, flags, pos, len);
785
#endif
786
        if(i==0 && pos > avi->movi_list)
787
            avi->movi_list= 0; //FIXME better check
788
        pos += avi->movi_list;
789

    
790
        index = ((tag & 0xff) - '0') * 10;
791
        index += ((tag >> 8) & 0xff) - '0';
792
        if (index >= s->nb_streams)
793
            continue;
794
        st = s->streams[index];
795
        ast = st->priv_data;
796

    
797
#if defined(DEBUG_SEEK)
798
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%Ld\n", len, ast->cum_len);
799
#endif
800
        if(last_pos == pos)
801
            avi->non_interleaved= 1;
802
        else
803
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
804
        if(ast->sample_size)
805
            ast->cum_len += len / ast->sample_size;
806
        else
807
            ast->cum_len ++;
808
        last_pos= pos;
809
    }
810
    return 0;
811
}
812

    
813
static int guess_ni_flag(AVFormatContext *s){
814
    int i;
815
    int64_t last_start=0;
816
    int64_t first_end= INT64_MAX;
817

    
818
    for(i=0; i<s->nb_streams; i++){
819
        AVStream *st = s->streams[i];
820
        int n= st->nb_index_entries;
821

    
822
        if(n <= 0)
823
            continue;
824

    
825
        if(st->index_entries[0].pos > last_start)
826
            last_start= st->index_entries[0].pos;
827
        if(st->index_entries[n-1].pos < first_end)
828
            first_end= st->index_entries[n-1].pos;
829
    }
830
    return last_start > first_end;
831
}
832

    
833
static int avi_load_index(AVFormatContext *s)
834
{
835
    AVIContext *avi = s->priv_data;
836
    ByteIOContext *pb = &s->pb;
837
    uint32_t tag, size;
838
    offset_t pos= url_ftell(pb);
839

    
840
    url_fseek(pb, avi->movi_end, SEEK_SET);
841
#ifdef DEBUG_SEEK
842
    printf("movi_end=0x%llx\n", avi->movi_end);
843
#endif
844
    for(;;) {
845
        if (url_feof(pb))
846
            break;
847
        tag = get_le32(pb);
848
        size = get_le32(pb);
849
#ifdef DEBUG_SEEK
850
        printf("tag=%c%c%c%c size=0x%x\n",
851
               tag & 0xff,
852
               (tag >> 8) & 0xff,
853
               (tag >> 16) & 0xff,
854
               (tag >> 24) & 0xff,
855
               size);
856
#endif
857
        switch(tag) {
858
        case MKTAG('i', 'd', 'x', '1'):
859
            if (avi_read_idx1(s, size) < 0)
860
                goto skip;
861
            else
862
                goto the_end;
863
            break;
864
        default:
865
        skip:
866
            size += (size & 1);
867
            url_fskip(pb, size);
868
            break;
869
        }
870
    }
871
 the_end:
872
    url_fseek(pb, pos, SEEK_SET);
873
    return 0;
874
}
875

    
876
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
877
{
878
    AVIContext *avi = s->priv_data;
879
    AVStream *st;
880
    int i, index;
881
    int64_t pos;
882

    
883
    if (!avi->index_loaded) {
884
        /* we only load the index on demand */
885
        avi_load_index(s);
886
        avi->index_loaded = 1;
887
    }
888
    assert(stream_index>= 0);
889

    
890
    st = s->streams[stream_index];
891
    index= av_index_search_timestamp(st, timestamp, flags);
892
    if(index<0)
893
        return -1;
894

    
895
    /* find the position */
896
    pos = st->index_entries[index].pos;
897
    timestamp = st->index_entries[index].timestamp;
898

    
899
//    av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
900

    
901
    for(i = 0; i < s->nb_streams; i++) {
902
        AVStream *st2 = s->streams[i];
903
        AVIStream *ast2 = st2->priv_data;
904

    
905
        ast2->packet_size=
906
        ast2->remaining= 0;
907

    
908
        if (st2->nb_index_entries <= 0)
909
            continue;
910

    
911
//        assert(st2->codec->block_align);
912
        assert(st2->time_base.den == ast2->rate);
913
        assert(st2->time_base.num == ast2->scale);
914
        index = av_index_search_timestamp(
915
                st2,
916
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
917
                flags | AVSEEK_FLAG_BACKWARD);
918
        if(index<0)
919
            index=0;
920

    
921
        if(!avi->non_interleaved){
922
            while(index>0 && st2->index_entries[index].pos > pos)
923
                index--;
924
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
925
                index++;
926
        }
927

    
928
//        av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
929
        /* extract the current frame number */
930
        ast2->frame_offset = st2->index_entries[index].timestamp;
931
        if(ast2->sample_size)
932
            ast2->frame_offset *=ast2->sample_size;
933
    }
934

    
935
    if (avi->dv_demux)
936
        dv_flush_audio_packets(avi->dv_demux);
937
    /* do the seek */
938
    url_fseek(&s->pb, pos, SEEK_SET);
939
    avi->stream_index= -1;
940
    return 0;
941
}
942

    
943
static int avi_read_close(AVFormatContext *s)
944
{
945
    int i;
946
    AVIContext *avi = s->priv_data;
947

    
948
    for(i=0;i<s->nb_streams;i++) {
949
        AVStream *st = s->streams[i];
950
        AVIStream *ast = st->priv_data;
951
        av_free(ast);
952
        av_free(st->codec->palctrl);
953
    }
954

    
955
    if (avi->dv_demux)
956
        av_free(avi->dv_demux);
957

    
958
    return 0;
959
}
960

    
961
static int avi_probe(AVProbeData *p)
962
{
963
    /* check file header */
964
    if (p->buf_size <= 32)
965
        return 0;
966
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
967
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
968
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
969
        p->buf[10] == 'I' && p->buf[11] == ' ')
970
        return AVPROBE_SCORE_MAX;
971
    else
972
        return 0;
973
}
974

    
975
AVInputFormat avi_demuxer = {
976
    "avi",
977
    "avi format",
978
    sizeof(AVIContext),
979
    avi_probe,
980
    avi_read_header,
981
    avi_read_packet,
982
    avi_read_close,
983
    avi_read_seek,
984
};