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ffmpeg / libavformat / avidec.c @ 1ac08937

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

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

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

    
32
#undef NDEBUG
33
#include <assert.h>
34

    
35
typedef struct AVIStream {
36
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
37
                         (used to compute the pts) */
38
    int remaining;
39
    int packet_size;
40

    
41
    int scale;
42
    int rate;
43
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
44

    
45
    int64_t cum_len; /* temporary storage (used during seek) */
46

    
47
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
48
    int prefix_count;
49
    uint32_t pal[256];
50
    int has_pal;
51
} AVIStream;
52

    
53
typedef struct {
54
    int64_t  riff_end;
55
    int64_t  movi_end;
56
    int64_t  fsize;
57
    int64_t movi_list;
58
    int64_t last_pkt_pos;
59
    int index_loaded;
60
    int is_odml;
61
    int non_interleaved;
62
    int stream_index;
63
    DVDemuxContext* dv_demux;
64
} AVIContext;
65

    
66
static const char avi_headers[][8] = {
67
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
68
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
69
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
70
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
71
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
72
    { 0 }
73
};
74

    
75
static int avi_load_index(AVFormatContext *s);
76
static int guess_ni_flag(AVFormatContext *s);
77

    
78
#ifdef DEBUG
79
static void print_tag(const char *str, unsigned int tag, int size)
80
{
81
    dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
82
           str, tag & 0xff,
83
           (tag >> 8) & 0xff,
84
           (tag >> 16) & 0xff,
85
           (tag >> 24) & 0xff,
86
           size);
87
}
88
#endif
89

    
90
static int get_riff(AVFormatContext *s, ByteIOContext *pb)
91
{
92
    AVIContext *avi = s->priv_data;
93
    char header[8];
94
    int i;
95

    
96
    /* check RIFF header */
97
    get_buffer(pb, header, 4);
98
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
99
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
100
    get_buffer(pb, header+4, 4);
101

    
102
    for(i=0; avi_headers[i][0]; i++)
103
        if(!memcmp(header, avi_headers[i], 8))
104
            break;
105
    if(!avi_headers[i][0])
106
        return -1;
107

    
108
    if(header[7] == 0x19)
109
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
110

    
111
    return 0;
112
}
113

    
114
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
115
    AVIContext *avi = s->priv_data;
116
    ByteIOContext *pb = s->pb;
117
    int longs_pre_entry= get_le16(pb);
118
    int index_sub_type = get_byte(pb);
119
    int index_type     = get_byte(pb);
120
    int entries_in_use = get_le32(pb);
121
    int chunk_id       = get_le32(pb);
122
    int64_t base       = get_le64(pb);
123
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
124
    AVStream *st;
125
    AVIStream *ast;
126
    int i;
127
    int64_t last_pos= -1;
128
    int64_t filesize= url_fsize(s->pb);
129

    
130
#ifdef DEBUG_SEEK
131
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
132
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
133
#endif
134

    
135
    if(stream_id >= s->nb_streams || stream_id < 0)
136
        return -1;
137
    st= s->streams[stream_id];
138
    ast = st->priv_data;
139

    
140
    if(index_sub_type)
141
        return -1;
142

    
143
    get_le32(pb);
144

    
145
    if(index_type && longs_pre_entry != 2)
146
        return -1;
147
    if(index_type>1)
148
        return -1;
149

    
150
    if(filesize > 0 && base >= filesize){
151
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
152
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
153
            base &= 0xFFFFFFFF;
154
        else
155
            return -1;
156
    }
157

    
158
    for(i=0; i<entries_in_use; i++){
159
        if(index_type){
160
            int64_t pos= get_le32(pb) + base - 8;
161
            int len    = get_le32(pb);
162
            int key= len >= 0;
163
            len &= 0x7FFFFFFF;
164

    
165
#ifdef DEBUG_SEEK
166
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
167
#endif
168
            if(url_feof(pb))
169
                return -1;
170

    
171
            if(last_pos == pos || pos == base - 8)
172
                avi->non_interleaved= 1;
173
            if(last_pos != pos && (len || !ast->sample_size))
174
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
175

    
176
            if(ast->sample_size)
177
                ast->cum_len += len;
178
            else
179
                ast->cum_len ++;
180
            last_pos= pos;
181
        }else{
182
            int64_t offset, pos;
183
            int duration;
184
            offset = get_le64(pb);
185
            get_le32(pb);       /* size */
186
            duration = get_le32(pb);
187

    
188
            if(url_feof(pb))
189
                return -1;
190

    
191
            pos = url_ftell(pb);
192

    
193
            url_fseek(pb, offset+8, SEEK_SET);
194
            read_braindead_odml_indx(s, frame_num);
195
            frame_num += duration;
196

    
197
            url_fseek(pb, pos, SEEK_SET);
198
        }
199
    }
200
    avi->index_loaded=1;
201
    return 0;
202
}
203

    
204
static void clean_index(AVFormatContext *s){
205
    int i;
206
    int64_t j;
207

    
208
    for(i=0; i<s->nb_streams; i++){
209
        AVStream *st = s->streams[i];
210
        AVIStream *ast = st->priv_data;
211
        int n= st->nb_index_entries;
212
        int max= ast->sample_size;
213
        int64_t pos, size, ts;
214

    
215
        if(n != 1 || ast->sample_size==0)
216
            continue;
217

    
218
        while(max < 1024) max+=max;
219

    
220
        pos= st->index_entries[0].pos;
221
        size= st->index_entries[0].size;
222
        ts= st->index_entries[0].timestamp;
223

    
224
        for(j=0; j<size; j+=max){
225
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
226
        }
227
    }
228
}
229

    
230
static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
231
{
232
    ByteIOContext *pb = s->pb;
233
    char *value;
234

    
235
    size += (size & 1);
236

    
237
    if (size == UINT_MAX)
238
        return -1;
239
    value = av_malloc(size+1);
240
    if (!value)
241
        return -1;
242
    get_strz(pb, value, size);
243

    
244
    return av_metadata_set2(&s->metadata, key, value,
245
                                  AV_METADATA_DONT_STRDUP_VAL);
246
}
247

    
248
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
249
{
250
    AVIContext *avi = s->priv_data;
251
    ByteIOContext *pb = s->pb;
252
    unsigned int tag, tag1, handler;
253
    int codec_type, stream_index, frame_period, bit_rate;
254
    unsigned int size;
255
    int i;
256
    AVStream *st;
257
    AVIStream *ast = NULL;
258
    int avih_width=0, avih_height=0;
259
    int amv_file_format=0;
260
    uint64_t list_end = 0;
261

    
262
    avi->stream_index= -1;
263

    
264
    if (get_riff(s, pb) < 0)
265
        return -1;
266

    
267
    avi->fsize = url_fsize(pb);
268
    if(avi->fsize<=0)
269
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
270

    
271
    /* first list tag */
272
    stream_index = -1;
273
    codec_type = -1;
274
    frame_period = 0;
275
    for(;;) {
276
        if (url_feof(pb))
277
            goto fail;
278
        tag = get_le32(pb);
279
        size = get_le32(pb);
280
#ifdef DEBUG
281
        print_tag("tag", tag, size);
282
#endif
283

    
284
        switch(tag) {
285
        case MKTAG('L', 'I', 'S', 'T'):
286
            list_end = url_ftell(pb) + size;
287
            /* Ignored, except at start of video packets. */
288
            tag1 = get_le32(pb);
289
#ifdef DEBUG
290
            print_tag("list", tag1, 0);
291
#endif
292
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
293
                avi->movi_list = url_ftell(pb) - 4;
294
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
295
                else     avi->movi_end = url_fsize(pb);
296
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
297
                goto end_of_header;
298
            }
299
            break;
300
        case MKTAG('d', 'm', 'l', 'h'):
301
            avi->is_odml = 1;
302
            url_fskip(pb, size + (size & 1));
303
            break;
304
        case MKTAG('a', 'm', 'v', 'h'):
305
            amv_file_format=1;
306
        case MKTAG('a', 'v', 'i', 'h'):
307
            /* AVI header */
308
            /* using frame_period is bad idea */
309
            frame_period = get_le32(pb);
310
            bit_rate = get_le32(pb) * 8;
311
            get_le32(pb);
312
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
313

    
314
            url_fskip(pb, 2 * 4);
315
            get_le32(pb);
316
            get_le32(pb);
317
            avih_width=get_le32(pb);
318
            avih_height=get_le32(pb);
319

    
320
            url_fskip(pb, size - 10 * 4);
321
            break;
322
        case MKTAG('s', 't', 'r', 'h'):
323
            /* stream header */
324

    
325
            tag1 = get_le32(pb);
326
            handler = get_le32(pb); /* codec tag */
327

    
328
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
329
                url_fskip(pb, size - 8);
330
                break;
331
            }else{
332
                stream_index++;
333
                st = av_new_stream(s, stream_index);
334
                if (!st)
335
                    goto fail;
336

    
337
                ast = av_mallocz(sizeof(AVIStream));
338
                if (!ast)
339
                    goto fail;
340
                st->priv_data = ast;
341
            }
342
            if(amv_file_format)
343
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
344

    
345
#ifdef DEBUG
346
            print_tag("strh", tag1, -1);
347
#endif
348
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
349
                int64_t dv_dur;
350

    
351
                /*
352
                 * After some consideration -- I don't think we
353
                 * have to support anything but DV in type1 AVIs.
354
                 */
355
                if (s->nb_streams != 1)
356
                    goto fail;
357

    
358
                if (handler != MKTAG('d', 'v', 's', 'd') &&
359
                    handler != MKTAG('d', 'v', 'h', 'd') &&
360
                    handler != MKTAG('d', 'v', 's', 'l'))
361
                   goto fail;
362

    
363
                ast = s->streams[0]->priv_data;
364
                av_freep(&s->streams[0]->codec->extradata);
365
                av_freep(&s->streams[0]);
366
                s->nb_streams = 0;
367
                if (CONFIG_DV_DEMUXER) {
368
                    avi->dv_demux = dv_init_demux(s);
369
                    if (!avi->dv_demux)
370
                        goto fail;
371
                }
372
                s->streams[0]->priv_data = ast;
373
                url_fskip(pb, 3 * 4);
374
                ast->scale = get_le32(pb);
375
                ast->rate = get_le32(pb);
376
                url_fskip(pb, 4);  /* start time */
377

    
378
                dv_dur = get_le32(pb);
379
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
380
                    dv_dur *= AV_TIME_BASE;
381
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
382
                }
383
                /*
384
                 * else, leave duration alone; timing estimation in utils.c
385
                 *      will make a guess based on bitrate.
386
                 */
387

    
388
                stream_index = s->nb_streams - 1;
389
                url_fskip(pb, size - 9*4);
390
                break;
391
            }
392

    
393
            assert(stream_index < s->nb_streams);
394
            st->codec->stream_codec_tag= handler;
395

    
396
            get_le32(pb); /* flags */
397
            get_le16(pb); /* priority */
398
            get_le16(pb); /* language */
399
            get_le32(pb); /* initial frame */
400
            ast->scale = get_le32(pb);
401
            ast->rate = get_le32(pb);
402
            if(!(ast->scale && ast->rate)){
403
                av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
404
                if(frame_period){
405
                    ast->rate = 1000000;
406
                    ast->scale = frame_period;
407
                }else{
408
                    ast->rate = 25;
409
                    ast->scale = 1;
410
                }
411
            }
412
            av_set_pts_info(st, 64, ast->scale, ast->rate);
413

    
414
            ast->cum_len=get_le32(pb); /* start */
415
            st->nb_frames = get_le32(pb);
416

    
417
            st->start_time = 0;
418
            get_le32(pb); /* buffer size */
419
            get_le32(pb); /* quality */
420
            ast->sample_size = get_le32(pb); /* sample ssize */
421
            ast->cum_len *= FFMAX(1, ast->sample_size);
422
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
423

    
424
            switch(tag1) {
425
            case MKTAG('v', 'i', 'd', 's'):
426
                codec_type = CODEC_TYPE_VIDEO;
427

    
428
                ast->sample_size = 0;
429
                break;
430
            case MKTAG('a', 'u', 'd', 's'):
431
                codec_type = CODEC_TYPE_AUDIO;
432
                break;
433
            case MKTAG('t', 'x', 't', 's'):
434
                //FIXME
435
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
436
                break;
437
            case MKTAG('d', 'a', 't', 's'):
438
                codec_type = CODEC_TYPE_DATA;
439
                break;
440
            default:
441
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
442
                goto fail;
443
            }
444
            if(ast->sample_size == 0)
445
                st->duration = st->nb_frames;
446
            ast->frame_offset= ast->cum_len;
447
            url_fskip(pb, size - 12 * 4);
448
            break;
449
        case MKTAG('s', 't', 'r', 'f'):
450
            /* stream header */
451
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
452
                url_fskip(pb, size);
453
            } else {
454
                uint64_t cur_pos = url_ftell(pb);
455
                if (cur_pos < list_end)
456
                    size = FFMIN(size, list_end - cur_pos);
457
                st = s->streams[stream_index];
458
                switch(codec_type) {
459
                case CODEC_TYPE_VIDEO:
460
                    if(amv_file_format){
461
                        st->codec->width=avih_width;
462
                        st->codec->height=avih_height;
463
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
464
                        st->codec->codec_id = CODEC_ID_AMV;
465
                        url_fskip(pb, size);
466
                        break;
467
                    }
468
                    get_le32(pb); /* size */
469
                    st->codec->width = get_le32(pb);
470
                    st->codec->height = (int32_t)get_le32(pb);
471
                    get_le16(pb); /* panes */
472
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
473
                    tag1 = get_le32(pb);
474
                    get_le32(pb); /* ImageSize */
475
                    get_le32(pb); /* XPelsPerMeter */
476
                    get_le32(pb); /* YPelsPerMeter */
477
                    get_le32(pb); /* ClrUsed */
478
                    get_le32(pb); /* ClrImportant */
479

    
480
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
481
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
482
                        st->codec->codec_tag = tag1;
483
                        st->codec->codec_id = CODEC_ID_XSUB;
484
                        break;
485
                    }
486

    
487
                    if(size > 10*4 && size<(1<<30)){
488
                        st->codec->extradata_size= size - 10*4;
489
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
490
                        if (!st->codec->extradata) {
491
                            st->codec->extradata_size= 0;
492
                            return AVERROR(ENOMEM);
493
                        }
494
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
495
                    }
496

    
497
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
498
                        get_byte(pb);
499

    
500
                    /* Extract palette from extradata if bpp <= 8. */
501
                    /* This code assumes that extradata contains only palette. */
502
                    /* This is true for all paletted codecs implemented in FFmpeg. */
503
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
504
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
505
#if HAVE_BIGENDIAN
506
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
507
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
508
#else
509
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
510
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
511
#endif
512
                        st->codec->palctrl->palette_changed = 1;
513
                    }
514

    
515
#ifdef DEBUG
516
                    print_tag("video", tag1, 0);
517
#endif
518
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
519
                    st->codec->codec_tag = tag1;
520
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
521
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
522
                    // Support "Resolution 1:1" for Avid AVI Codec
523
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
524
                       st->codec->extradata_size >= 31 &&
525
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
526
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
527

    
528
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
529
                        st->codec->extradata_size+= 9;
530
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
531
                        if(st->codec->extradata)
532
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
533
                    }
534
                    st->codec->height= FFABS(st->codec->height);
535

    
536
//                    url_fskip(pb, size - 5 * 4);
537
                    break;
538
                case CODEC_TYPE_AUDIO:
539
                    ff_get_wav_header(pb, st->codec, size);
540
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
541
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
542
                        ast->sample_size= st->codec->block_align;
543
                    }
544
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
545
                        url_fskip(pb, 1);
546
                    /* Force parsing as several audio frames can be in
547
                     * one packet and timestamps refer to packet start. */
548
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
549
                    /* ADTS header is in extradata, AAC without header must be
550
                     * stored as exact frames. Parser not needed and it will
551
                     * fail. */
552
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
553
                        st->need_parsing = AVSTREAM_PARSE_NONE;
554
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
555
                     * audio in the header but have Axan as stream_code_tag. */
556
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
557
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
558
                        st->codec->codec_tag = 0;
559
                    }
560
                    if (amv_file_format)
561
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
562
                    break;
563
                default:
564
                    st->codec->codec_type = CODEC_TYPE_DATA;
565
                    st->codec->codec_id= CODEC_ID_NONE;
566
                    st->codec->codec_tag= 0;
567
                    url_fskip(pb, size);
568
                    break;
569
                }
570
            }
571
            break;
572
        case MKTAG('i', 'n', 'd', 'x'):
573
            i= url_ftell(pb);
574
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
575
                read_braindead_odml_indx(s, 0);
576
            }
577
            url_fseek(pb, i+size, SEEK_SET);
578
            break;
579
        case MKTAG('v', 'p', 'r', 'p'):
580
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
581
                AVRational active, active_aspect;
582

    
583
                st = s->streams[stream_index];
584
                get_le32(pb);
585
                get_le32(pb);
586
                get_le32(pb);
587
                get_le32(pb);
588
                get_le32(pb);
589

    
590
                active_aspect.den= get_le16(pb);
591
                active_aspect.num= get_le16(pb);
592
                active.num       = get_le32(pb);
593
                active.den       = get_le32(pb);
594
                get_le32(pb); //nbFieldsPerFrame
595

    
596
                if(active_aspect.num && active_aspect.den && active.num && active.den){
597
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
598
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
599
                }
600
                size -= 9*4;
601
            }
602
            url_fseek(pb, size, SEEK_CUR);
603
            break;
604
        case MKTAG('I', 'N', 'A', 'M'):
605
            avi_read_tag(s, "Title", size);
606
            break;
607
        case MKTAG('I', 'A', 'R', 'T'):
608
            avi_read_tag(s, "Artist", size);
609
            break;
610
        case MKTAG('I', 'C', 'O', 'P'):
611
            avi_read_tag(s, "Copyright", size);
612
            break;
613
        case MKTAG('I', 'C', 'M', 'T'):
614
            avi_read_tag(s, "Comment", size);
615
            break;
616
        case MKTAG('I', 'G', 'N', 'R'):
617
            avi_read_tag(s, "Genre", size);
618
            break;
619
        case MKTAG('I', 'P', 'R', 'D'):
620
            avi_read_tag(s, "Album", size);
621
            break;
622
        case MKTAG('I', 'P', 'R', 'T'):
623
            avi_read_tag(s, "Track", size);
624
            break;
625
        default:
626
            if(size > 1000000){
627
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
628
                                        "I will ignore it and try to continue anyway.\n");
629
                avi->movi_list = url_ftell(pb) - 4;
630
                avi->movi_end  = url_fsize(pb);
631
                goto end_of_header;
632
            }
633
            /* skip tag */
634
            size += (size & 1);
635
            url_fskip(pb, size);
636
            break;
637
        }
638
    }
639
 end_of_header:
640
    /* check stream number */
641
    if (stream_index != s->nb_streams - 1) {
642
    fail:
643
        return -1;
644
    }
645

    
646
    if(!avi->index_loaded && !url_is_streamed(pb))
647
        avi_load_index(s);
648
    avi->index_loaded = 1;
649
    avi->non_interleaved |= guess_ni_flag(s);
650
    if(avi->non_interleaved) {
651
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
652
        clean_index(s);
653
    }
654

    
655
    return 0;
656
}
657

    
658
static int get_stream_idx(int *d){
659
    if(    d[0] >= '0' && d[0] <= '9'
660
        && d[1] >= '0' && d[1] <= '9'){
661
        return (d[0] - '0') * 10 + (d[1] - '0');
662
    }else{
663
        return 100; //invalid stream ID
664
    }
665
}
666

    
667
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
668
{
669
    AVIContext *avi = s->priv_data;
670
    ByteIOContext *pb = s->pb;
671
    int n, d[8];
672
    unsigned int size;
673
    int64_t i, sync;
674
    void* dstr;
675

    
676
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
677
        int size = dv_get_packet(avi->dv_demux, pkt);
678
        if (size >= 0)
679
            return size;
680
    }
681

    
682
    if(avi->non_interleaved){
683
        int best_stream_index = 0;
684
        AVStream *best_st= NULL;
685
        AVIStream *best_ast;
686
        int64_t best_ts= INT64_MAX;
687
        int i;
688

    
689
        for(i=0; i<s->nb_streams; i++){
690
            AVStream *st = s->streams[i];
691
            AVIStream *ast = st->priv_data;
692
            int64_t ts= ast->frame_offset;
693
            int64_t last_ts;
694

    
695
            if(!st->nb_index_entries)
696
                continue;
697

    
698
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
699
            if(!ast->remaining && ts > last_ts)
700
                continue;
701

    
702
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
703

    
704
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
705
            if(ts < best_ts){
706
                best_ts= ts;
707
                best_st= st;
708
                best_stream_index= i;
709
            }
710
        }
711
        if(!best_st)
712
            return -1;
713

    
714
        best_ast = best_st->priv_data;
715
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
716
        if(best_ast->remaining)
717
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
718
        else{
719
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
720
            if(i>=0)
721
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
722
        }
723

    
724
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
725
        if(i>=0){
726
            int64_t pos= best_st->index_entries[i].pos;
727
            pos += best_ast->packet_size - best_ast->remaining;
728
            url_fseek(s->pb, pos + 8, SEEK_SET);
729
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
730

    
731
            assert(best_ast->remaining <= best_ast->packet_size);
732

    
733
            avi->stream_index= best_stream_index;
734
            if(!best_ast->remaining)
735
                best_ast->packet_size=
736
                best_ast->remaining= best_st->index_entries[i].size;
737
        }
738
    }
739

    
740
resync:
741
    if(avi->stream_index >= 0){
742
        AVStream *st= s->streams[ avi->stream_index ];
743
        AVIStream *ast= st->priv_data;
744
        int size, err;
745

    
746
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
747
            size= INT_MAX;
748
        else if(ast->sample_size < 32)
749
            size= 64*ast->sample_size;
750
        else
751
            size= ast->sample_size;
752

    
753
        if(size > ast->remaining)
754
            size= ast->remaining;
755
        avi->last_pkt_pos= url_ftell(pb);
756
        err= av_get_packet(pb, pkt, size);
757
        if(err<0)
758
            return err;
759

    
760
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
761
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
762
            if(ptr){
763
            ast->has_pal=0;
764
            pkt->size += 4*256;
765
            pkt->data= ptr;
766
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
767
            }else
768
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
769
        }
770

    
771
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
772
            dstr = pkt->destruct;
773
            size = dv_produce_packet(avi->dv_demux, pkt,
774
                                    pkt->data, pkt->size);
775
            pkt->destruct = dstr;
776
            pkt->flags |= PKT_FLAG_KEY;
777
        } else {
778
            /* XXX: How to handle B-frames in AVI? */
779
            pkt->dts = ast->frame_offset;
780
//                pkt->dts += ast->start;
781
            if(ast->sample_size)
782
                pkt->dts /= ast->sample_size;
783
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
784
            pkt->stream_index = avi->stream_index;
785

    
786
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
787
                AVIndexEntry *e;
788
                int index;
789
                assert(st->index_entries);
790

    
791
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
792
                e= &st->index_entries[index];
793

    
794
                if(index >= 0 && e->timestamp == ast->frame_offset){
795
                    if (e->flags & AVINDEX_KEYFRAME)
796
                        pkt->flags |= PKT_FLAG_KEY;
797
                }
798
            } else {
799
                pkt->flags |= PKT_FLAG_KEY;
800
            }
801
            if(ast->sample_size)
802
                ast->frame_offset += pkt->size;
803
            else
804
                ast->frame_offset++;
805
        }
806
        ast->remaining -= size;
807
        if(!ast->remaining){
808
            avi->stream_index= -1;
809
            ast->packet_size= 0;
810
        }
811

    
812
        return size;
813
    }
814

    
815
    memset(d, -1, sizeof(int)*8);
816
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
817
        int j;
818

    
819
        for(j=0; j<7; j++)
820
            d[j]= d[j+1];
821
        d[7]= get_byte(pb);
822

    
823
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
824

    
825
        n= get_stream_idx(d+2);
826
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
827
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
828
            continue;
829

    
830
        //parse ix##
831
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
832
        //parse JUNK
833
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
834
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
835
            url_fskip(pb, size);
836
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
837
            goto resync;
838
        }
839

    
840
        //parse stray LIST
841
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
842
            url_fskip(pb, 4);
843
            goto resync;
844
        }
845

    
846
        n= get_stream_idx(d);
847

    
848
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
849
            continue;
850

    
851
        //detect ##ix chunk and skip
852
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
853
            url_fskip(pb, size);
854
            goto resync;
855
        }
856

    
857
        //parse ##dc/##wb
858
        if(n < s->nb_streams){
859
            AVStream *st;
860
            AVIStream *ast;
861
            st = s->streams[n];
862
            ast = st->priv_data;
863

    
864
            if(s->nb_streams>=2){
865
                AVStream *st1  = s->streams[1];
866
                AVIStream *ast1= st1->priv_data;
867
                //workaround for broken small-file-bug402.avi
868
                if(   d[2] == 'w' && d[3] == 'b'
869
                   && n==0
870
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
871
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
872
                   && ast->prefix == 'd'*256+'c'
873
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
874
                  ){
875
                    n=1;
876
                    st = st1;
877
                    ast = ast1;
878
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
879
                }
880
            }
881

    
882

    
883
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
884
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
885
               || st->discard >= AVDISCARD_ALL){
886
                if(ast->sample_size) ast->frame_offset += pkt->size;
887
                else                 ast->frame_offset++;
888
                url_fskip(pb, size);
889
                goto resync;
890
            }
891

    
892
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
893
                int k = get_byte(pb);
894
                int last = (k + get_byte(pb) - 1) & 0xFF;
895

    
896
                get_le16(pb); //flags
897

    
898
                for (; k <= last; k++)
899
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
900
                ast->has_pal= 1;
901
                goto resync;
902
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
903
                         d[2]*256+d[3] == ast->prefix /*||
904
                         (d[2] == 'd' && d[3] == 'c') ||
905
                         (d[2] == 'w' && d[3] == 'b')*/) {
906

    
907
//av_log(s, AV_LOG_DEBUG, "OK\n");
908
                if(d[2]*256+d[3] == ast->prefix)
909
                    ast->prefix_count++;
910
                else{
911
                    ast->prefix= d[2]*256+d[3];
912
                    ast->prefix_count= 0;
913
                }
914

    
915
                avi->stream_index= n;
916
                ast->packet_size= size + 8;
917
                ast->remaining= size;
918

    
919
                if(size || !ast->sample_size){
920
                    uint64_t pos= url_ftell(pb) - 8;
921
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
922
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
923
                    }
924
                }
925
                goto resync;
926
            }
927
        }
928
    }
929

    
930
    return AVERROR_EOF;
931
}
932

    
933
/* XXX: We make the implicit supposition that the positions are sorted
934
   for each stream. */
935
static int avi_read_idx1(AVFormatContext *s, int size)
936
{
937
    AVIContext *avi = s->priv_data;
938
    ByteIOContext *pb = s->pb;
939
    int nb_index_entries, i;
940
    AVStream *st;
941
    AVIStream *ast;
942
    unsigned int index, tag, flags, pos, len;
943
    unsigned last_pos= -1;
944

    
945
    nb_index_entries = size / 16;
946
    if (nb_index_entries <= 0)
947
        return -1;
948

    
949
    /* Read the entries and sort them in each stream component. */
950
    for(i = 0; i < nb_index_entries; i++) {
951
        tag = get_le32(pb);
952
        flags = get_le32(pb);
953
        pos = get_le32(pb);
954
        len = get_le32(pb);
955
#if defined(DEBUG_SEEK)
956
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
957
               i, tag, flags, pos, len);
958
#endif
959
        if(i==0 && pos > avi->movi_list)
960
            avi->movi_list= 0; //FIXME better check
961
        pos += avi->movi_list;
962

    
963
        index = ((tag & 0xff) - '0') * 10;
964
        index += ((tag >> 8) & 0xff) - '0';
965
        if (index >= s->nb_streams)
966
            continue;
967
        st = s->streams[index];
968
        ast = st->priv_data;
969

    
970
#if defined(DEBUG_SEEK)
971
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
972
#endif
973
        if(url_feof(pb))
974
            return -1;
975

    
976
        if(last_pos == pos)
977
            avi->non_interleaved= 1;
978
        else if(len || !ast->sample_size)
979
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
980
        if(ast->sample_size)
981
            ast->cum_len += len;
982
        else
983
            ast->cum_len ++;
984
        last_pos= pos;
985
    }
986
    return 0;
987
}
988

    
989
static int guess_ni_flag(AVFormatContext *s){
990
    int i;
991
    int64_t last_start=0;
992
    int64_t first_end= INT64_MAX;
993
    int64_t oldpos= url_ftell(s->pb);
994

    
995
    for(i=0; i<s->nb_streams; i++){
996
        AVStream *st = s->streams[i];
997
        int n= st->nb_index_entries;
998
        unsigned int size;
999

    
1000
        if(n <= 0)
1001
            continue;
1002

    
1003
        if(n >= 2){
1004
            int64_t pos= st->index_entries[0].pos;
1005
            url_fseek(s->pb, pos + 4, SEEK_SET);
1006
            size= get_le32(s->pb);
1007
            if(pos + size > st->index_entries[1].pos)
1008
                last_start= INT64_MAX;
1009
        }
1010

    
1011
        if(st->index_entries[0].pos > last_start)
1012
            last_start= st->index_entries[0].pos;
1013
        if(st->index_entries[n-1].pos < first_end)
1014
            first_end= st->index_entries[n-1].pos;
1015
    }
1016
    url_fseek(s->pb, oldpos, SEEK_SET);
1017
    return last_start > first_end;
1018
}
1019

    
1020
static int avi_load_index(AVFormatContext *s)
1021
{
1022
    AVIContext *avi = s->priv_data;
1023
    ByteIOContext *pb = s->pb;
1024
    uint32_t tag, size;
1025
    int64_t pos= url_ftell(pb);
1026
    int ret = -1;
1027

    
1028
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1029
        goto the_end; // maybe truncated file
1030
#ifdef DEBUG_SEEK
1031
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1032
#endif
1033
    for(;;) {
1034
        if (url_feof(pb))
1035
            break;
1036
        tag = get_le32(pb);
1037
        size = get_le32(pb);
1038
#ifdef DEBUG_SEEK
1039
        printf("tag=%c%c%c%c size=0x%x\n",
1040
               tag & 0xff,
1041
               (tag >> 8) & 0xff,
1042
               (tag >> 16) & 0xff,
1043
               (tag >> 24) & 0xff,
1044
               size);
1045
#endif
1046
        switch(tag) {
1047
        case MKTAG('i', 'd', 'x', '1'):
1048
            if (avi_read_idx1(s, size) < 0)
1049
                goto skip;
1050
            ret = 0;
1051
                goto the_end;
1052
            break;
1053
        default:
1054
        skip:
1055
            size += (size & 1);
1056
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1057
                goto the_end; // something is wrong here
1058
            break;
1059
        }
1060
    }
1061
 the_end:
1062
    url_fseek(pb, pos, SEEK_SET);
1063
    return ret;
1064
}
1065

    
1066
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1067
{
1068
    AVIContext *avi = s->priv_data;
1069
    AVStream *st;
1070
    int i, index;
1071
    int64_t pos;
1072
    AVIStream *ast;
1073

    
1074
    if (!avi->index_loaded) {
1075
        /* we only load the index on demand */
1076
        avi_load_index(s);
1077
        avi->index_loaded = 1;
1078
    }
1079
    assert(stream_index>= 0);
1080

    
1081
    st = s->streams[stream_index];
1082
    ast= st->priv_data;
1083
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1084
    if(index<0)
1085
        return -1;
1086

    
1087
    /* find the position */
1088
    pos = st->index_entries[index].pos;
1089
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1090

    
1091
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1092

    
1093
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1094
        /* One and only one real stream for DV in AVI, and it has video  */
1095
        /* offsets. Calling with other stream indexes should have failed */
1096
        /* the av_index_search_timestamp call above.                     */
1097
        assert(stream_index == 0);
1098

    
1099
        /* Feed the DV video stream version of the timestamp to the */
1100
        /* DV demux so it can synthesize correct timestamps.        */
1101
        dv_offset_reset(avi->dv_demux, timestamp);
1102

    
1103
        url_fseek(s->pb, pos, SEEK_SET);
1104
        avi->stream_index= -1;
1105
        return 0;
1106
    }
1107

    
1108
    for(i = 0; i < s->nb_streams; i++) {
1109
        AVStream *st2 = s->streams[i];
1110
        AVIStream *ast2 = st2->priv_data;
1111

    
1112
        ast2->packet_size=
1113
        ast2->remaining= 0;
1114

    
1115
        if (st2->nb_index_entries <= 0)
1116
            continue;
1117

    
1118
//        assert(st2->codec->block_align);
1119
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1120
        index = av_index_search_timestamp(
1121
                st2,
1122
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1123
                flags | AVSEEK_FLAG_BACKWARD);
1124
        if(index<0)
1125
            index=0;
1126

    
1127
        if(!avi->non_interleaved){
1128
            while(index>0 && st2->index_entries[index].pos > pos)
1129
                index--;
1130
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1131
                index++;
1132
        }
1133

    
1134
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1135
        /* extract the current frame number */
1136
        ast2->frame_offset = st2->index_entries[index].timestamp;
1137
    }
1138

    
1139
    /* do the seek */
1140
    url_fseek(s->pb, pos, SEEK_SET);
1141
    avi->stream_index= -1;
1142
    return 0;
1143
}
1144

    
1145
static int avi_read_close(AVFormatContext *s)
1146
{
1147
    int i;
1148
    AVIContext *avi = s->priv_data;
1149

    
1150
    for(i=0;i<s->nb_streams;i++) {
1151
        AVStream *st = s->streams[i];
1152
        av_free(st->codec->palctrl);
1153
    }
1154

    
1155
    if (avi->dv_demux)
1156
        av_free(avi->dv_demux);
1157

    
1158
    return 0;
1159
}
1160

    
1161
static int avi_probe(AVProbeData *p)
1162
{
1163
    int i;
1164

    
1165
    /* check file header */
1166
    for(i=0; avi_headers[i][0]; i++)
1167
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1168
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1169
            return AVPROBE_SCORE_MAX;
1170

    
1171
    return 0;
1172
}
1173

    
1174
AVInputFormat avi_demuxer = {
1175
    "avi",
1176
    NULL_IF_CONFIG_SMALL("AVI format"),
1177
    sizeof(AVIContext),
1178
    avi_probe,
1179
    avi_read_header,
1180
    avi_read_packet,
1181
    avi_read_close,
1182
    avi_read_seek,
1183
};