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ffmpeg / libavformat / avidec.c @ 87ad63c0

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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
#include "libavutil/intreadwrite.h"
23
#include "libavutil/bswap.h"
24
#include "avformat.h"
25
#include "avi.h"
26
#include "dv.h"
27
#include "riff.h"
28

    
29
#undef NDEBUG
30
#include <assert.h>
31

    
32
//#define DEBUG
33
//#define DEBUG_SEEK
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
    printf("%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(last_pos == pos || pos == base - 8)
169
                avi->non_interleaved= 1;
170
            if(last_pos != pos)
171
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
172

    
173
            if(ast->sample_size)
174
                ast->cum_len += len;
175
            else
176
                ast->cum_len ++;
177
            last_pos= pos;
178
        }else{
179
            int64_t offset, pos;
180
            int duration;
181
            offset = get_le64(pb);
182
            get_le32(pb);       /* size */
183
            duration = get_le32(pb);
184
            pos = url_ftell(pb);
185

    
186
            url_fseek(pb, offset+8, SEEK_SET);
187
            read_braindead_odml_indx(s, frame_num);
188
            frame_num += duration;
189

    
190
            url_fseek(pb, pos, SEEK_SET);
191
        }
192
    }
193
    avi->index_loaded=1;
194
    return 0;
195
}
196

    
197
static void clean_index(AVFormatContext *s){
198
    int i;
199
    int64_t j;
200

    
201
    for(i=0; i<s->nb_streams; i++){
202
        AVStream *st = s->streams[i];
203
        AVIStream *ast = st->priv_data;
204
        int n= st->nb_index_entries;
205
        int max= ast->sample_size;
206
        int64_t pos, size, ts;
207

    
208
        if(n != 1 || ast->sample_size==0)
209
            continue;
210

    
211
        while(max < 1024) max+=max;
212

    
213
        pos= st->index_entries[0].pos;
214
        size= st->index_entries[0].size;
215
        ts= st->index_entries[0].timestamp;
216

    
217
        for(j=0; j<size; j+=max){
218
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
219
        }
220
    }
221
}
222

    
223
static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
224
{
225
    ByteIOContext *pb = s->pb;
226
    uint8_t value[1024];
227

    
228
    int64_t i = url_ftell(pb);
229
    size += (size & 1);
230
    get_strz(pb, value, sizeof(value));
231
    url_fseek(pb, i+size, SEEK_SET);
232

    
233
    return av_metadata_set(&s->metadata, key, value);
234
}
235

    
236
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
237
{
238
    AVIContext *avi = s->priv_data;
239
    ByteIOContext *pb = s->pb;
240
    unsigned int tag, tag1, handler;
241
    int codec_type, stream_index, frame_period, bit_rate;
242
    unsigned int size, nb_frames;
243
    int i;
244
    AVStream *st;
245
    AVIStream *ast = NULL;
246
    int avih_width=0, avih_height=0;
247
    int amv_file_format=0;
248

    
249
    avi->stream_index= -1;
250

    
251
    if (get_riff(s, avi, pb) < 0)
252
        return -1;
253

    
254
    avi->fsize = url_fsize(pb);
255
    if(avi->fsize<=0)
256
        avi->fsize= avi->riff_end;
257

    
258
    /* first list tag */
259
    stream_index = -1;
260
    codec_type = -1;
261
    frame_period = 0;
262
    for(;;) {
263
        if (url_feof(pb))
264
            goto fail;
265
        tag = get_le32(pb);
266
        size = get_le32(pb);
267
#ifdef DEBUG
268
        print_tag("tag", tag, size);
269
#endif
270

    
271
        switch(tag) {
272
        case MKTAG('L', 'I', 'S', 'T'):
273
            /* Ignored, except at start of video packets. */
274
            tag1 = get_le32(pb);
275
#ifdef DEBUG
276
            print_tag("list", tag1, 0);
277
#endif
278
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
279
                avi->movi_list = url_ftell(pb) - 4;
280
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
281
                else     avi->movi_end = url_fsize(pb);
282
#ifdef DEBUG
283
                printf("movi end=%"PRIx64"\n", avi->movi_end);
284
#endif
285
                goto end_of_header;
286
            }
287
            break;
288
        case MKTAG('d', 'm', 'l', 'h'):
289
            avi->is_odml = 1;
290
            url_fskip(pb, size + (size & 1));
291
            break;
292
        case MKTAG('a', 'm', 'v', 'h'):
293
            amv_file_format=1;
294
        case MKTAG('a', 'v', 'i', 'h'):
295
            /* AVI header */
296
            /* using frame_period is bad idea */
297
            frame_period = get_le32(pb);
298
            bit_rate = get_le32(pb) * 8;
299
            get_le32(pb);
300
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
301

    
302
            url_fskip(pb, 2 * 4);
303
            get_le32(pb);
304
            get_le32(pb);
305
            avih_width=get_le32(pb);
306
            avih_height=get_le32(pb);
307

    
308
            url_fskip(pb, size - 10 * 4);
309
            break;
310
        case MKTAG('s', 't', 'r', 'h'):
311
            /* stream header */
312

    
313
            tag1 = get_le32(pb);
314
            handler = get_le32(pb); /* codec tag */
315

    
316
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
317
                url_fskip(pb, size - 8);
318
                break;
319
            }else{
320
                stream_index++;
321
                st = av_new_stream(s, stream_index);
322
                if (!st)
323
                    goto fail;
324

    
325
                ast = av_mallocz(sizeof(AVIStream));
326
                if (!ast)
327
                    goto fail;
328
                st->priv_data = ast;
329
            }
330
            if(amv_file_format)
331
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
332

    
333
#ifdef DEBUG
334
            print_tag("strh", tag1, -1);
335
#endif
336
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
337
                int64_t dv_dur;
338

    
339
                /*
340
                 * After some consideration -- I don't think we
341
                 * have to support anything but DV in type1 AVIs.
342
                 */
343
                if (s->nb_streams != 1)
344
                    goto fail;
345

    
346
                if (handler != MKTAG('d', 'v', 's', 'd') &&
347
                    handler != MKTAG('d', 'v', 'h', 'd') &&
348
                    handler != MKTAG('d', 'v', 's', 'l'))
349
                   goto fail;
350

    
351
                ast = s->streams[0]->priv_data;
352
                av_freep(&s->streams[0]->codec->extradata);
353
                av_freep(&s->streams[0]);
354
                s->nb_streams = 0;
355
                if (CONFIG_DV_DEMUXER) {
356
                    avi->dv_demux = dv_init_demux(s);
357
                    if (!avi->dv_demux)
358
                        goto fail;
359
                }
360
                s->streams[0]->priv_data = ast;
361
                url_fskip(pb, 3 * 4);
362
                ast->scale = get_le32(pb);
363
                ast->rate = get_le32(pb);
364
                url_fskip(pb, 4);  /* start time */
365

    
366
                dv_dur = get_le32(pb);
367
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
368
                    dv_dur *= AV_TIME_BASE;
369
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
370
                }
371
                /*
372
                 * else, leave duration alone; timing estimation in utils.c
373
                 *      will make a guess based on bitrate.
374
                 */
375

    
376
                stream_index = s->nb_streams - 1;
377
                url_fskip(pb, size - 9*4);
378
                break;
379
            }
380

    
381
            assert(stream_index < s->nb_streams);
382
            st->codec->stream_codec_tag= handler;
383

    
384
            get_le32(pb); /* flags */
385
            get_le16(pb); /* priority */
386
            get_le16(pb); /* language */
387
            get_le32(pb); /* initial frame */
388
            ast->scale = get_le32(pb);
389
            ast->rate = get_le32(pb);
390
            if(!(ast->scale && ast->rate)){
391
                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);
392
                if(frame_period){
393
                    ast->rate = 1000000;
394
                    ast->scale = frame_period;
395
                }else{
396
                    ast->rate = 25;
397
                    ast->scale = 1;
398
                }
399
            }
400
            av_set_pts_info(st, 64, ast->scale, ast->rate);
401

    
402
            ast->cum_len=get_le32(pb); /* start */
403
            nb_frames = get_le32(pb);
404

    
405
            st->start_time = 0;
406
            st->duration = nb_frames;
407
            get_le32(pb); /* buffer size */
408
            get_le32(pb); /* quality */
409
            ast->sample_size = get_le32(pb); /* sample ssize */
410
            ast->cum_len *= FFMAX(1, ast->sample_size);
411
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
412

    
413
            switch(tag1) {
414
            case MKTAG('v', 'i', 'd', 's'):
415
                codec_type = CODEC_TYPE_VIDEO;
416

    
417
                ast->sample_size = 0;
418
                break;
419
            case MKTAG('a', 'u', 'd', 's'):
420
                codec_type = CODEC_TYPE_AUDIO;
421
                break;
422
            case MKTAG('t', 'x', 't', 's'):
423
                //FIXME
424
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
425
                break;
426
            case MKTAG('d', 'a', 't', 's'):
427
                codec_type = CODEC_TYPE_DATA;
428
                break;
429
            default:
430
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
431
                goto fail;
432
            }
433
            ast->frame_offset= ast->cum_len;
434
            url_fskip(pb, size - 12 * 4);
435
            break;
436
        case MKTAG('s', 't', 'r', 'f'):
437
            /* stream header */
438
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
439
                url_fskip(pb, size);
440
            } else {
441
                st = s->streams[stream_index];
442
                switch(codec_type) {
443
                case CODEC_TYPE_VIDEO:
444
                    if(amv_file_format){
445
                        st->codec->width=avih_width;
446
                        st->codec->height=avih_height;
447
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
448
                        st->codec->codec_id = CODEC_ID_AMV;
449
                        url_fskip(pb, size);
450
                        break;
451
                    }
452
                    get_le32(pb); /* size */
453
                    st->codec->width = get_le32(pb);
454
                    st->codec->height = get_le32(pb);
455
                    get_le16(pb); /* panes */
456
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
457
                    tag1 = get_le32(pb);
458
                    get_le32(pb); /* ImageSize */
459
                    get_le32(pb); /* XPelsPerMeter */
460
                    get_le32(pb); /* YPelsPerMeter */
461
                    get_le32(pb); /* ClrUsed */
462
                    get_le32(pb); /* ClrImportant */
463

    
464
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
465
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
466
                        st->codec->codec_tag = tag1;
467
                        st->codec->codec_id = CODEC_ID_XSUB;
468
                        break;
469
                    }
470

    
471
                    if(size > 10*4 && size<(1<<30)){
472
                        st->codec->extradata_size= size - 10*4;
473
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
474
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
475
                    }
476

    
477
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
478
                        get_byte(pb);
479

    
480
                    /* Extract palette from extradata if bpp <= 8. */
481
                    /* This code assumes that extradata contains only palette. */
482
                    /* This is true for all paletted codecs implemented in FFmpeg. */
483
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
484
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
485
#ifdef WORDS_BIGENDIAN
486
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
487
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
488
#else
489
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
490
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
491
#endif
492
                        st->codec->palctrl->palette_changed = 1;
493
                    }
494

    
495
#ifdef DEBUG
496
                    print_tag("video", tag1, 0);
497
#endif
498
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
499
                    st->codec->codec_tag = tag1;
500
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
501
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
502
//                    url_fskip(pb, size - 5 * 4);
503
                    break;
504
                case CODEC_TYPE_AUDIO:
505
                    get_wav_header(pb, st->codec, size);
506
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
507
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
508
                        ast->sample_size= st->codec->block_align;
509
                    }
510
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
511
                        url_fskip(pb, 1);
512
                    /* Force parsing as several audio frames can be in
513
                     * one packet and timestamps refer to packet start. */
514
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
515
                    /* ADTS header is in extradata, AAC without header must be
516
                     * stored as exact frames. Parser not needed and it will
517
                     * fail. */
518
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
519
                        st->need_parsing = AVSTREAM_PARSE_NONE;
520
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
521
                     * audio in the header but have Axan as stream_code_tag. */
522
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
523
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
524
                        st->codec->codec_tag = 0;
525
                    }
526
                    if (amv_file_format)
527
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
528
                    break;
529
                default:
530
                    st->codec->codec_type = CODEC_TYPE_DATA;
531
                    st->codec->codec_id= CODEC_ID_NONE;
532
                    st->codec->codec_tag= 0;
533
                    url_fskip(pb, size);
534
                    break;
535
                }
536
            }
537
            break;
538
        case MKTAG('i', 'n', 'd', 'x'):
539
            i= url_ftell(pb);
540
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
541
                read_braindead_odml_indx(s, 0);
542
            }
543
            url_fseek(pb, i+size, SEEK_SET);
544
            break;
545
        case MKTAG('v', 'p', 'r', 'p'):
546
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
547
                AVRational active, active_aspect;
548

    
549
                st = s->streams[stream_index];
550
                get_le32(pb);
551
                get_le32(pb);
552
                get_le32(pb);
553
                get_le32(pb);
554
                get_le32(pb);
555

    
556
                active_aspect.den= get_le16(pb);
557
                active_aspect.num= get_le16(pb);
558
                active.num       = get_le32(pb);
559
                active.den       = get_le32(pb);
560
                get_le32(pb); //nbFieldsPerFrame
561

    
562
                if(active_aspect.num && active_aspect.den && active.num && active.den){
563
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
564
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
565
                }
566
                size -= 9*4;
567
            }
568
            url_fseek(pb, size, SEEK_CUR);
569
            break;
570
        case MKTAG('I', 'N', 'A', 'M'):
571
            avi_read_tag(s, "Title", size);
572
            break;
573
        case MKTAG('I', 'A', 'R', 'T'):
574
            avi_read_tag(s, "Artist", size);
575
            break;
576
        case MKTAG('I', 'C', 'O', 'P'):
577
            avi_read_tag(s, "Copyright", size);
578
            break;
579
        case MKTAG('I', 'C', 'M', 'T'):
580
            avi_read_tag(s, "Comment", size);
581
            break;
582
        case MKTAG('I', 'G', 'N', 'R'):
583
            avi_read_tag(s, "Genre", size);
584
            break;
585
        case MKTAG('I', 'P', 'R', 'D'):
586
            avi_read_tag(s, "Album", size);
587
            break;
588
        case MKTAG('I', 'P', 'R', 'T'):
589
            avi_read_tag(s, "Track", size);
590
            break;
591
        default:
592
            if(size > 1000000){
593
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
594
                                        "I will ignore it and try to continue anyway.\n");
595
                avi->movi_list = url_ftell(pb) - 4;
596
                avi->movi_end  = url_fsize(pb);
597
                goto end_of_header;
598
            }
599
            /* skip tag */
600
            size += (size & 1);
601
            url_fskip(pb, size);
602
            break;
603
        }
604
    }
605
 end_of_header:
606
    /* check stream number */
607
    if (stream_index != s->nb_streams - 1) {
608
    fail:
609
        return -1;
610
    }
611

    
612
    if(!avi->index_loaded && !url_is_streamed(pb))
613
        avi_load_index(s);
614
    avi->index_loaded = 1;
615
    avi->non_interleaved |= guess_ni_flag(s);
616
    if(avi->non_interleaved) {
617
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
618
        clean_index(s);
619
    }
620

    
621
    return 0;
622
}
623

    
624
static int get_stream_idx(int *d){
625
    if(    d[0] >= '0' && d[0] <= '9'
626
        && d[1] >= '0' && d[1] <= '9'){
627
        return (d[0] - '0') * 10 + (d[1] - '0');
628
    }else{
629
        return 100; //invalid stream ID
630
    }
631
}
632

    
633
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
634
{
635
    AVIContext *avi = s->priv_data;
636
    ByteIOContext *pb = s->pb;
637
    int n, d[8], size;
638
    int64_t i, sync;
639
    void* dstr;
640

    
641
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
642
        size = dv_get_packet(avi->dv_demux, pkt);
643
        if (size >= 0)
644
            return size;
645
    }
646

    
647
    if(avi->non_interleaved){
648
        int best_stream_index = 0;
649
        AVStream *best_st= NULL;
650
        AVIStream *best_ast;
651
        int64_t best_ts= INT64_MAX;
652
        int i;
653

    
654
        for(i=0; i<s->nb_streams; i++){
655
            AVStream *st = s->streams[i];
656
            AVIStream *ast = st->priv_data;
657
            int64_t ts= ast->frame_offset;
658

    
659
            if(ast->sample_size)
660
                ts /= ast->sample_size;
661
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
662

    
663
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
664
            if(ts < best_ts && st->nb_index_entries){
665
                best_ts= ts;
666
                best_st= st;
667
                best_stream_index= i;
668
            }
669
        }
670
        if(!best_st)
671
            return -1;
672

    
673
        best_ast = best_st->priv_data;
674
        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
675
        if(best_ast->remaining)
676
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
677
        else{
678
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
679
            if(i>=0)
680
                best_ast->frame_offset= best_st->index_entries[i].timestamp
681
                                      * FFMAX(1, best_ast->sample_size);
682
        }
683

    
684
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
685
        if(i>=0){
686
            int64_t pos= best_st->index_entries[i].pos;
687
            pos += best_ast->packet_size - best_ast->remaining;
688
            url_fseek(s->pb, pos + 8, SEEK_SET);
689
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
690

    
691
            assert(best_ast->remaining <= best_ast->packet_size);
692

    
693
            avi->stream_index= best_stream_index;
694
            if(!best_ast->remaining)
695
                best_ast->packet_size=
696
                best_ast->remaining= best_st->index_entries[i].size;
697
        }
698
    }
699

    
700
resync:
701
    if(avi->stream_index >= 0){
702
        AVStream *st= s->streams[ avi->stream_index ];
703
        AVIStream *ast= st->priv_data;
704
        int size;
705

    
706
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
707
            size= INT_MAX;
708
        else if(ast->sample_size < 32)
709
            size= 64*ast->sample_size;
710
        else
711
            size= ast->sample_size;
712

    
713
        if(size > ast->remaining)
714
            size= ast->remaining;
715
        avi->last_pkt_pos= url_ftell(pb);
716
        av_get_packet(pb, pkt, size);
717

    
718
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
719
            ast->has_pal=0;
720
            pkt->size += 4*256;
721
            pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
722
            if(pkt->data)
723
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
724
        }
725

    
726
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
727
            dstr = pkt->destruct;
728
            size = dv_produce_packet(avi->dv_demux, pkt,
729
                                    pkt->data, pkt->size);
730
            pkt->destruct = dstr;
731
            pkt->flags |= PKT_FLAG_KEY;
732
        } else {
733
            /* XXX: How to handle B-frames in AVI? */
734
            pkt->dts = ast->frame_offset;
735
//                pkt->dts += ast->start;
736
            if(ast->sample_size)
737
                pkt->dts /= ast->sample_size;
738
//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);
739
            pkt->stream_index = avi->stream_index;
740

    
741
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
742
                AVIndexEntry *e;
743
                int index;
744
                assert(st->index_entries);
745

    
746
                index= av_index_search_timestamp(st, pkt->dts, 0);
747
                e= &st->index_entries[index];
748

    
749
                if(index >= 0 && e->timestamp == ast->frame_offset){
750
                    if (e->flags & AVINDEX_KEYFRAME)
751
                        pkt->flags |= PKT_FLAG_KEY;
752
                }
753
            } else {
754
                pkt->flags |= PKT_FLAG_KEY;
755
            }
756
            if(ast->sample_size)
757
                ast->frame_offset += pkt->size;
758
            else
759
                ast->frame_offset++;
760
        }
761
        ast->remaining -= size;
762
        if(!ast->remaining){
763
            avi->stream_index= -1;
764
            ast->packet_size= 0;
765
        }
766

    
767
        return size;
768
    }
769

    
770
    memset(d, -1, sizeof(int)*8);
771
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
772
        int j;
773

    
774
        for(j=0; j<7; j++)
775
            d[j]= d[j+1];
776
        d[7]= get_byte(pb);
777

    
778
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
779

    
780
        n= get_stream_idx(d+2);
781
//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);
782
        if(i + size > avi->fsize || d[0]<0)
783
            continue;
784

    
785
        //parse ix##
786
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
787
        //parse JUNK
788
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
789
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
790
            url_fskip(pb, size);
791
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
792
            goto resync;
793
        }
794

    
795
        n= get_stream_idx(d);
796

    
797
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
798
            continue;
799

    
800
        //parse ##dc/##wb
801
        if(n < s->nb_streams){
802
            AVStream *st;
803
            AVIStream *ast;
804
            st = s->streams[n];
805
            ast = st->priv_data;
806

    
807
            if(s->nb_streams>=2){
808
                AVStream *st1  = s->streams[1];
809
                AVIStream *ast1= st1->priv_data;
810
                //workaround for broken small-file-bug402.avi
811
                if(   d[2] == 'w' && d[3] == 'b'
812
                   && n==0
813
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
814
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
815
                   && ast->prefix == 'd'*256+'c'
816
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
817
                  ){
818
                    n=1;
819
                    st = st1;
820
                    ast = ast1;
821
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
822
                }
823
            }
824

    
825

    
826
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
827
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
828
               || st->discard >= AVDISCARD_ALL){
829
                if(ast->sample_size) ast->frame_offset += pkt->size;
830
                else                 ast->frame_offset++;
831
                url_fskip(pb, size);
832
                goto resync;
833
            }
834

    
835
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
836
                int k = get_byte(pb);
837
                int last = (k + get_byte(pb) - 1) & 0xFF;
838

    
839
                get_le16(pb); //flags
840

    
841
                for (; k <= last; k++)
842
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
843
                ast->has_pal= 1;
844
                goto resync;
845
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
846
                         d[2]*256+d[3] == ast->prefix /*||
847
                         (d[2] == 'd' && d[3] == 'c') ||
848
                         (d[2] == 'w' && d[3] == 'b')*/) {
849

    
850
//av_log(s, AV_LOG_DEBUG, "OK\n");
851
                if(d[2]*256+d[3] == ast->prefix)
852
                    ast->prefix_count++;
853
                else{
854
                    ast->prefix= d[2]*256+d[3];
855
                    ast->prefix_count= 0;
856
                }
857

    
858
                avi->stream_index= n;
859
                ast->packet_size= size + 8;
860
                ast->remaining= size;
861

    
862
                {
863
                    uint64_t pos= url_ftell(pb) - 8;
864
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
865
                        av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
866
                    }
867
                }
868
                goto resync;
869
            }
870
        }
871
    }
872

    
873
    return -1;
874
}
875

    
876
/* XXX: We make the implicit supposition that the positions are sorted
877
   for each stream. */
878
static int avi_read_idx1(AVFormatContext *s, int size)
879
{
880
    AVIContext *avi = s->priv_data;
881
    ByteIOContext *pb = s->pb;
882
    int nb_index_entries, i;
883
    AVStream *st;
884
    AVIStream *ast;
885
    unsigned int index, tag, flags, pos, len;
886
    unsigned last_pos= -1;
887

    
888
    nb_index_entries = size / 16;
889
    if (nb_index_entries <= 0)
890
        return -1;
891

    
892
    /* Read the entries and sort them in each stream component. */
893
    for(i = 0; i < nb_index_entries; i++) {
894
        tag = get_le32(pb);
895
        flags = get_le32(pb);
896
        pos = get_le32(pb);
897
        len = get_le32(pb);
898
#if defined(DEBUG_SEEK)
899
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
900
               i, tag, flags, pos, len);
901
#endif
902
        if(i==0 && pos > avi->movi_list)
903
            avi->movi_list= 0; //FIXME better check
904
        pos += avi->movi_list;
905

    
906
        index = ((tag & 0xff) - '0') * 10;
907
        index += ((tag >> 8) & 0xff) - '0';
908
        if (index >= s->nb_streams)
909
            continue;
910
        st = s->streams[index];
911
        ast = st->priv_data;
912

    
913
#if defined(DEBUG_SEEK)
914
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
915
#endif
916
        if(last_pos == pos)
917
            avi->non_interleaved= 1;
918
        else
919
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
920
        if(ast->sample_size)
921
            ast->cum_len += len;
922
        else
923
            ast->cum_len ++;
924
        last_pos= pos;
925
    }
926
    return 0;
927
}
928

    
929
static int guess_ni_flag(AVFormatContext *s){
930
    int i;
931
    int64_t last_start=0;
932
    int64_t first_end= INT64_MAX;
933

    
934
    for(i=0; i<s->nb_streams; i++){
935
        AVStream *st = s->streams[i];
936
        int n= st->nb_index_entries;
937

    
938
        if(n <= 0)
939
            continue;
940

    
941
        if(st->index_entries[0].pos > last_start)
942
            last_start= st->index_entries[0].pos;
943
        if(st->index_entries[n-1].pos < first_end)
944
            first_end= st->index_entries[n-1].pos;
945
    }
946
    return last_start > first_end;
947
}
948

    
949
static int avi_load_index(AVFormatContext *s)
950
{
951
    AVIContext *avi = s->priv_data;
952
    ByteIOContext *pb = s->pb;
953
    uint32_t tag, size;
954
    int64_t pos= url_ftell(pb);
955

    
956
    url_fseek(pb, avi->movi_end, SEEK_SET);
957
#ifdef DEBUG_SEEK
958
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
959
#endif
960
    for(;;) {
961
        if (url_feof(pb))
962
            break;
963
        tag = get_le32(pb);
964
        size = get_le32(pb);
965
#ifdef DEBUG_SEEK
966
        printf("tag=%c%c%c%c size=0x%x\n",
967
               tag & 0xff,
968
               (tag >> 8) & 0xff,
969
               (tag >> 16) & 0xff,
970
               (tag >> 24) & 0xff,
971
               size);
972
#endif
973
        switch(tag) {
974
        case MKTAG('i', 'd', 'x', '1'):
975
            if (avi_read_idx1(s, size) < 0)
976
                goto skip;
977
            else
978
                goto the_end;
979
            break;
980
        default:
981
        skip:
982
            size += (size & 1);
983
            url_fskip(pb, size);
984
            break;
985
        }
986
    }
987
 the_end:
988
    url_fseek(pb, pos, SEEK_SET);
989
    return 0;
990
}
991

    
992
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
993
{
994
    AVIContext *avi = s->priv_data;
995
    AVStream *st;
996
    int i, index;
997
    int64_t pos;
998

    
999
    if (!avi->index_loaded) {
1000
        /* we only load the index on demand */
1001
        avi_load_index(s);
1002
        avi->index_loaded = 1;
1003
    }
1004
    assert(stream_index>= 0);
1005

    
1006
    st = s->streams[stream_index];
1007
    index= av_index_search_timestamp(st, timestamp, flags);
1008
    if(index<0)
1009
        return -1;
1010

    
1011
    /* find the position */
1012
    pos = st->index_entries[index].pos;
1013
    timestamp = st->index_entries[index].timestamp;
1014

    
1015
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1016

    
1017
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1018
        /* One and only one real stream for DV in AVI, and it has video  */
1019
        /* offsets. Calling with other stream indexes should have failed */
1020
        /* the av_index_search_timestamp call above.                     */
1021
        assert(stream_index == 0);
1022

    
1023
        /* Feed the DV video stream version of the timestamp to the */
1024
        /* DV demux so it can synthesize correct timestamps.        */
1025
        dv_offset_reset(avi->dv_demux, timestamp);
1026

    
1027
        url_fseek(s->pb, pos, SEEK_SET);
1028
        avi->stream_index= -1;
1029
        return 0;
1030
    }
1031

    
1032
    for(i = 0; i < s->nb_streams; i++) {
1033
        AVStream *st2 = s->streams[i];
1034
        AVIStream *ast2 = st2->priv_data;
1035

    
1036
        ast2->packet_size=
1037
        ast2->remaining= 0;
1038

    
1039
        if (st2->nb_index_entries <= 0)
1040
            continue;
1041

    
1042
//        assert(st2->codec->block_align);
1043
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1044
        index = av_index_search_timestamp(
1045
                st2,
1046
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1047
                flags | AVSEEK_FLAG_BACKWARD);
1048
        if(index<0)
1049
            index=0;
1050

    
1051
        if(!avi->non_interleaved){
1052
            while(index>0 && st2->index_entries[index].pos > pos)
1053
                index--;
1054
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1055
                index++;
1056
        }
1057

    
1058
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1059
        /* extract the current frame number */
1060
        ast2->frame_offset = st2->index_entries[index].timestamp;
1061
        if(ast2->sample_size)
1062
            ast2->frame_offset *=ast2->sample_size;
1063
    }
1064

    
1065
    /* do the seek */
1066
    url_fseek(s->pb, pos, SEEK_SET);
1067
    avi->stream_index= -1;
1068
    return 0;
1069
}
1070

    
1071
static int avi_read_close(AVFormatContext *s)
1072
{
1073
    int i;
1074
    AVIContext *avi = s->priv_data;
1075

    
1076
    for(i=0;i<s->nb_streams;i++) {
1077
        AVStream *st = s->streams[i];
1078
        av_free(st->codec->palctrl);
1079
    }
1080

    
1081
    if (avi->dv_demux)
1082
        av_free(avi->dv_demux);
1083

    
1084
    return 0;
1085
}
1086

    
1087
static int avi_probe(AVProbeData *p)
1088
{
1089
    int i;
1090

    
1091
    /* check file header */
1092
    for(i=0; avi_headers[i][0]; i++)
1093
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1094
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1095
            return AVPROBE_SCORE_MAX;
1096

    
1097
    return 0;
1098
}
1099

    
1100
AVInputFormat avi_demuxer = {
1101
    "avi",
1102
    NULL_IF_CONFIG_SMALL("AVI format"),
1103
    sizeof(AVIContext),
1104
    avi_probe,
1105
    avi_read_header,
1106
    avi_read_packet,
1107
    avi_read_close,
1108
    avi_read_seek,
1109
};