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ffmpeg / libavformat / avidec.c @ 47146dfb

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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
    uint32_t pal[256];
47
    int has_pal;
48
} AVIStream;
49

    
50
typedef struct {
51
    int64_t  riff_end;
52
    int64_t  movi_end;
53
    int64_t  fsize;
54
    int64_t movi_list;
55
    int64_t last_pkt_pos;
56
    int index_loaded;
57
    int is_odml;
58
    int non_interleaved;
59
    int stream_index;
60
    DVDemuxContext* dv_demux;
61
} AVIContext;
62

    
63
static const char avi_headers[][8] = {
64
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
65
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
66
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
67
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
68
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
69
    { 0 }
70
};
71

    
72
static int avi_load_index(AVFormatContext *s);
73
static int guess_ni_flag(AVFormatContext *s);
74

    
75
#ifdef DEBUG
76
static void print_tag(const char *str, unsigned int tag, int size)
77
{
78
    printf("%s: tag=%c%c%c%c size=0x%x\n",
79
           str, tag & 0xff,
80
           (tag >> 8) & 0xff,
81
           (tag >> 16) & 0xff,
82
           (tag >> 24) & 0xff,
83
           size);
84
}
85
#endif
86

    
87
static int get_riff(AVIContext *avi, ByteIOContext *pb)
88
{
89
    char header[8];
90
    int i;
91

    
92
    /* check RIFF header */
93
    get_buffer(pb, header, 4);
94
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
95
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
96
    get_buffer(pb, header+4, 4);
97

    
98
    for(i=0; avi_headers[i][0]; i++)
99
        if(!memcmp(header, avi_headers[i], 8))
100
            break;
101
    if(!avi_headers[i][0])
102
        return -1;
103

    
104
    if(header[7] == 0x19)
105
        av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
106

    
107
    return 0;
108
}
109

    
110
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
111
    AVIContext *avi = s->priv_data;
112
    ByteIOContext *pb = s->pb;
113
    int longs_pre_entry= get_le16(pb);
114
    int index_sub_type = get_byte(pb);
115
    int index_type     = get_byte(pb);
116
    int entries_in_use = get_le32(pb);
117
    int chunk_id       = get_le32(pb);
118
    int64_t base       = get_le64(pb);
119
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
120
    AVStream *st;
121
    AVIStream *ast;
122
    int i;
123
    int64_t last_pos= -1;
124
    int64_t filesize= url_fsize(s->pb);
125

    
126
#ifdef DEBUG_SEEK
127
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
128
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
129
#endif
130

    
131
    if(stream_id > s->nb_streams || stream_id < 0)
132
        return -1;
133
    st= s->streams[stream_id];
134
    ast = st->priv_data;
135

    
136
    if(index_sub_type)
137
        return -1;
138

    
139
    get_le32(pb);
140

    
141
    if(index_type && longs_pre_entry != 2)
142
        return -1;
143
    if(index_type>1)
144
        return -1;
145

    
146
    if(filesize > 0 && base >= filesize){
147
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
148
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
149
            base &= 0xFFFFFFFF;
150
        else
151
            return -1;
152
    }
153

    
154
    for(i=0; i<entries_in_use; i++){
155
        if(index_type){
156
            int64_t pos= get_le32(pb) + base - 8;
157
            int len    = get_le32(pb);
158
            int key= len >= 0;
159
            len &= 0x7FFFFFFF;
160

    
161
#ifdef DEBUG_SEEK
162
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
163
#endif
164
            if(last_pos == pos || pos == base - 8)
165
                avi->non_interleaved= 1;
166
            if(last_pos != pos)
167
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
168

    
169
            if(ast->sample_size)
170
                ast->cum_len += len;
171
            else
172
                ast->cum_len ++;
173
            last_pos= pos;
174
        }else{
175
            int64_t offset, pos;
176
            int duration;
177
            offset = get_le64(pb);
178
            get_le32(pb);       /* size */
179
            duration = get_le32(pb);
180
            pos = url_ftell(pb);
181

    
182
            url_fseek(pb, offset+8, SEEK_SET);
183
            read_braindead_odml_indx(s, frame_num);
184
            frame_num += duration;
185

    
186
            url_fseek(pb, pos, SEEK_SET);
187
        }
188
    }
189
    avi->index_loaded=1;
190
    return 0;
191
}
192

    
193
static void clean_index(AVFormatContext *s){
194
    int i;
195
    int64_t j;
196

    
197
    for(i=0; i<s->nb_streams; i++){
198
        AVStream *st = s->streams[i];
199
        AVIStream *ast = st->priv_data;
200
        int n= st->nb_index_entries;
201
        int max= ast->sample_size;
202
        int64_t pos, size, ts;
203

    
204
        if(n != 1 || ast->sample_size==0)
205
            continue;
206

    
207
        while(max < 1024) max+=max;
208

    
209
        pos= st->index_entries[0].pos;
210
        size= st->index_entries[0].size;
211
        ts= st->index_entries[0].timestamp;
212

    
213
        for(j=0; j<size; j+=max){
214
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
215
        }
216
    }
217
}
218

    
219
static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
220
{
221
    ByteIOContext *pb = s->pb;
222
    uint8_t value[1024];
223

    
224
    int64_t i = url_ftell(pb);
225
    size += (size & 1);
226
    get_strz(pb, value, sizeof(value));
227
    url_fseek(pb, i+size, SEEK_SET);
228

    
229
    return av_metadata_set(&s->meta_data, (const AVMetaDataTag){key, value});
230
}
231

    
232
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
233
{
234
    AVIContext *avi = s->priv_data;
235
    ByteIOContext *pb = s->pb;
236
    uint32_t tag, tag1, handler;
237
    int codec_type, stream_index, frame_period, bit_rate;
238
    unsigned int size, nb_frames;
239
    int i;
240
    AVStream *st;
241
    AVIStream *ast = NULL;
242
    int avih_width=0, avih_height=0;
243
    int amv_file_format=0;
244

    
245
    avi->stream_index= -1;
246

    
247
    if (get_riff(avi, pb) < 0)
248
        return -1;
249

    
250
    avi->fsize = url_fsize(pb);
251
    if(avi->fsize<=0)
252
        avi->fsize= avi->riff_end;
253

    
254
    /* first list tag */
255
    stream_index = -1;
256
    codec_type = -1;
257
    frame_period = 0;
258
    for(;;) {
259
        if (url_feof(pb))
260
            goto fail;
261
        tag = get_le32(pb);
262
        size = get_le32(pb);
263
#ifdef DEBUG
264
        print_tag("tag", tag, size);
265
#endif
266

    
267
        switch(tag) {
268
        case MKTAG('L', 'I', 'S', 'T'):
269
            /* Ignored, except at start of video packets. */
270
            tag1 = get_le32(pb);
271
#ifdef DEBUG
272
            print_tag("list", tag1, 0);
273
#endif
274
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
275
                avi->movi_list = url_ftell(pb) - 4;
276
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
277
                else     avi->movi_end = url_fsize(pb);
278
#ifdef DEBUG
279
                printf("movi end=%"PRIx64"\n", avi->movi_end);
280
#endif
281
                goto end_of_header;
282
            }
283
            break;
284
        case MKTAG('d', 'm', 'l', 'h'):
285
            avi->is_odml = 1;
286
            url_fskip(pb, size + (size & 1));
287
            break;
288
        case MKTAG('a', 'm', 'v', 'h'):
289
            amv_file_format=1;
290
        case MKTAG('a', 'v', 'i', 'h'):
291
            /* AVI header */
292
            /* using frame_period is bad idea */
293
            frame_period = get_le32(pb);
294
            bit_rate = get_le32(pb) * 8;
295
            get_le32(pb);
296
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
297

    
298
            url_fskip(pb, 2 * 4);
299
            get_le32(pb);
300
            get_le32(pb);
301
            avih_width=get_le32(pb);
302
            avih_height=get_le32(pb);
303

    
304
            url_fskip(pb, size - 10 * 4);
305
            break;
306
        case MKTAG('s', 't', 'r', 'h'):
307
            /* stream header */
308

    
309
            tag1 = get_le32(pb);
310
            handler = get_le32(pb); /* codec tag */
311

    
312
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
313
                url_fskip(pb, size - 8);
314
                break;
315
            }else{
316
                stream_index++;
317
                st = av_new_stream(s, stream_index);
318
                if (!st)
319
                    goto fail;
320

    
321
                ast = av_mallocz(sizeof(AVIStream));
322
                if (!ast)
323
                    goto fail;
324
                st->priv_data = ast;
325
            }
326
            if(amv_file_format)
327
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
328

    
329
#ifdef DEBUG
330
            print_tag("strh", tag1, -1);
331
#endif
332
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
333
                int64_t dv_dur;
334

    
335
                /*
336
                 * After some consideration -- I don't think we
337
                 * have to support anything but DV in type1 AVIs.
338
                 */
339
                if (s->nb_streams != 1)
340
                    goto fail;
341

    
342
                if (handler != MKTAG('d', 'v', 's', 'd') &&
343
                    handler != MKTAG('d', 'v', 'h', 'd') &&
344
                    handler != MKTAG('d', 'v', 's', 'l'))
345
                   goto fail;
346

    
347
                ast = s->streams[0]->priv_data;
348
                av_freep(&s->streams[0]->codec->extradata);
349
                av_freep(&s->streams[0]);
350
                s->nb_streams = 0;
351
                if (ENABLE_DV_DEMUXER) {
352
                    avi->dv_demux = dv_init_demux(s);
353
                    if (!avi->dv_demux)
354
                        goto fail;
355
                }
356
                s->streams[0]->priv_data = ast;
357
                url_fskip(pb, 3 * 4);
358
                ast->scale = get_le32(pb);
359
                ast->rate = get_le32(pb);
360
                url_fskip(pb, 4);  /* start time */
361

    
362
                dv_dur = get_le32(pb);
363
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
364
                    dv_dur *= AV_TIME_BASE;
365
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
366
                }
367
                /*
368
                 * else, leave duration alone; timing estimation in utils.c
369
                 *      will make a guess based on bitrate.
370
                 */
371

    
372
                stream_index = s->nb_streams - 1;
373
                url_fskip(pb, size - 9*4);
374
                break;
375
            }
376

    
377
            assert(stream_index < s->nb_streams);
378
            st->codec->stream_codec_tag= handler;
379

    
380
            get_le32(pb); /* flags */
381
            get_le16(pb); /* priority */
382
            get_le16(pb); /* language */
383
            get_le32(pb); /* initial frame */
384
            ast->scale = get_le32(pb);
385
            ast->rate = get_le32(pb);
386
            if(!(ast->scale && ast->rate)){
387
                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);
388
                if(frame_period){
389
                    ast->rate = 1000000;
390
                    ast->scale = frame_period;
391
                }else{
392
                    ast->rate = 25;
393
                    ast->scale = 1;
394
                }
395
            }
396
            av_set_pts_info(st, 64, ast->scale, ast->rate);
397

    
398
            ast->cum_len=get_le32(pb); /* start */
399
            nb_frames = get_le32(pb);
400

    
401
            st->start_time = 0;
402
            st->duration = nb_frames;
403
            get_le32(pb); /* buffer size */
404
            get_le32(pb); /* quality */
405
            ast->sample_size = get_le32(pb); /* sample ssize */
406
            ast->cum_len *= FFMAX(1, ast->sample_size);
407
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
408

    
409
            switch(tag1) {
410
            case MKTAG('v', 'i', 'd', 's'):
411
                codec_type = CODEC_TYPE_VIDEO;
412

    
413
                ast->sample_size = 0;
414
                break;
415
            case MKTAG('a', 'u', 'd', 's'):
416
                codec_type = CODEC_TYPE_AUDIO;
417
                break;
418
            case MKTAG('t', 'x', 't', 's'):
419
                //FIXME
420
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
421
                break;
422
            case MKTAG('d', 'a', 't', 's'):
423
                codec_type = CODEC_TYPE_DATA;
424
                break;
425
            default:
426
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
427
                goto fail;
428
            }
429
            ast->frame_offset= ast->cum_len;
430
            url_fskip(pb, size - 12 * 4);
431
            break;
432
        case MKTAG('s', 't', 'r', 'f'):
433
            /* stream header */
434
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
435
                url_fskip(pb, size);
436
            } else {
437
                st = s->streams[stream_index];
438
                switch(codec_type) {
439
                case CODEC_TYPE_VIDEO:
440
                    if(amv_file_format){
441
                        st->codec->width=avih_width;
442
                        st->codec->height=avih_height;
443
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
444
                        st->codec->codec_id = CODEC_ID_AMV;
445
                        url_fskip(pb, size);
446
                        break;
447
                    }
448
                    get_le32(pb); /* size */
449
                    st->codec->width = get_le32(pb);
450
                    st->codec->height = get_le32(pb);
451
                    get_le16(pb); /* panes */
452
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
453
                    tag1 = get_le32(pb);
454
                    get_le32(pb); /* ImageSize */
455
                    get_le32(pb); /* XPelsPerMeter */
456
                    get_le32(pb); /* YPelsPerMeter */
457
                    get_le32(pb); /* ClrUsed */
458
                    get_le32(pb); /* ClrImportant */
459

    
460
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
461
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
462
                        st->codec->codec_tag = tag1;
463
                        st->codec->codec_id = CODEC_ID_XSUB;
464
                        break;
465
                    }
466

    
467
                    if(size > 10*4 && size<(1<<30)){
468
                        st->codec->extradata_size= size - 10*4;
469
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
470
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
471
                    }
472

    
473
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
474
                        get_byte(pb);
475

    
476
                    /* Extract palette from extradata if bpp <= 8. */
477
                    /* This code assumes that extradata contains only palette. */
478
                    /* This is true for all paletted codecs implemented in FFmpeg. */
479
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
480
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
481
#ifdef WORDS_BIGENDIAN
482
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
483
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
484
#else
485
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
486
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
487
#endif
488
                        st->codec->palctrl->palette_changed = 1;
489
                    }
490

    
491
#ifdef DEBUG
492
                    print_tag("video", tag1, 0);
493
#endif
494
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
495
                    st->codec->codec_tag = tag1;
496
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
497
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
498
//                    url_fskip(pb, size - 5 * 4);
499
                    break;
500
                case CODEC_TYPE_AUDIO:
501
                    get_wav_header(pb, st->codec, size);
502
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
503
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
504
                        ast->sample_size= st->codec->block_align;
505
                    }
506
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
507
                        url_fskip(pb, 1);
508
                    /* Force parsing as several audio frames can be in
509
                     * one packet and timestamps refer to packet start. */
510
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
511
                    /* ADTS header is in extradata, AAC without header must be
512
                     * stored as exact frames. Parser not needed and it will
513
                     * fail. */
514
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
515
                        st->need_parsing = AVSTREAM_PARSE_NONE;
516
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
517
                     * audio in the header but have Axan as stream_code_tag. */
518
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
519
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
520
                        st->codec->codec_tag = 0;
521
                    }
522
                    if (amv_file_format)
523
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
524
                    break;
525
                default:
526
                    st->codec->codec_type = CODEC_TYPE_DATA;
527
                    st->codec->codec_id= CODEC_ID_NONE;
528
                    st->codec->codec_tag= 0;
529
                    url_fskip(pb, size);
530
                    break;
531
                }
532
            }
533
            break;
534
        case MKTAG('i', 'n', 'd', 'x'):
535
            i= url_ftell(pb);
536
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
537
                read_braindead_odml_indx(s, 0);
538
            }
539
            url_fseek(pb, i+size, SEEK_SET);
540
            break;
541
        case MKTAG('v', 'p', 'r', 'p'):
542
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
543
                AVRational active, active_aspect;
544

    
545
                st = s->streams[stream_index];
546
                get_le32(pb);
547
                get_le32(pb);
548
                get_le32(pb);
549
                get_le32(pb);
550
                get_le32(pb);
551

    
552
                active_aspect.den= get_le16(pb);
553
                active_aspect.num= get_le16(pb);
554
                active.num       = get_le32(pb);
555
                active.den       = get_le32(pb);
556
                get_le32(pb); //nbFieldsPerFrame
557

    
558
                if(active_aspect.num && active_aspect.den && active.num && active.den){
559
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
560
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
561
                }
562
                size -= 9*4;
563
            }
564
            url_fseek(pb, size, SEEK_CUR);
565
            break;
566
        case MKTAG('I', 'N', 'A', 'M'):
567
            avi_read_tag(s, "Title", size);
568
            break;
569
        case MKTAG('I', 'A', 'R', 'T'):
570
            avi_read_tag(s, "Artist", size);
571
            break;
572
        case MKTAG('I', 'C', 'O', 'P'):
573
            avi_read_tag(s, "Copyright", size);
574
            break;
575
        case MKTAG('I', 'C', 'M', 'T'):
576
            avi_read_tag(s, "Comment", size);
577
            break;
578
        case MKTAG('I', 'G', 'N', 'R'):
579
            avi_read_tag(s, "Genre", size);
580
            break;
581
        case MKTAG('I', 'P', 'R', 'D'):
582
            avi_read_tag(s, "Album", size);
583
            break;
584
        case MKTAG('I', 'P', 'R', 'T'):
585
            avi_read_tag(s, "Track", size);
586
            break;
587
        default:
588
            if(size > 1000000){
589
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
590
                                        "I will ignore it and try to continue anyway.\n");
591
                avi->movi_list = url_ftell(pb) - 4;
592
                avi->movi_end  = url_fsize(pb);
593
                goto end_of_header;
594
            }
595
            /* skip tag */
596
            size += (size & 1);
597
            url_fskip(pb, size);
598
            break;
599
        }
600
    }
601
 end_of_header:
602
    /* check stream number */
603
    if (stream_index != s->nb_streams - 1) {
604
    fail:
605
        return -1;
606
    }
607

    
608
    if(!avi->index_loaded && !url_is_streamed(pb))
609
        avi_load_index(s);
610
    avi->index_loaded = 1;
611
    avi->non_interleaved |= guess_ni_flag(s);
612
    if(avi->non_interleaved) {
613
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
614
        clean_index(s);
615
    }
616

    
617
    return 0;
618
}
619

    
620
static int get_stream_idx(int *d){
621
    if(    d[0] >= '0' && d[0] <= '9'
622
        && d[1] >= '0' && d[1] <= '9'){
623
        return (d[0] - '0') * 10 + (d[1] - '0');
624
    }else{
625
        return 100; //invalid stream ID
626
    }
627
}
628

    
629
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
630
{
631
    AVIContext *avi = s->priv_data;
632
    ByteIOContext *pb = s->pb;
633
    int n, d[8], size;
634
    int64_t i, sync;
635
    void* dstr;
636

    
637
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
638
        size = dv_get_packet(avi->dv_demux, pkt);
639
        if (size >= 0)
640
            return size;
641
    }
642

    
643
    if(avi->non_interleaved){
644
        int best_stream_index = 0;
645
        AVStream *best_st= NULL;
646
        AVIStream *best_ast;
647
        int64_t best_ts= INT64_MAX;
648
        int i;
649

    
650
        for(i=0; i<s->nb_streams; i++){
651
            AVStream *st = s->streams[i];
652
            AVIStream *ast = st->priv_data;
653
            int64_t ts= ast->frame_offset;
654

    
655
            if(ast->sample_size)
656
                ts /= ast->sample_size;
657
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
658

    
659
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
660
            if(ts < best_ts && st->nb_index_entries){
661
                best_ts= ts;
662
                best_st= st;
663
                best_stream_index= i;
664
            }
665
        }
666
        if(!best_st)
667
            return -1;
668

    
669
        best_ast = best_st->priv_data;
670
        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
671
        if(best_ast->remaining)
672
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
673
        else{
674
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
675
            if(i>=0)
676
                best_ast->frame_offset= best_st->index_entries[i].timestamp
677
                                      * FFMAX(1, best_ast->sample_size);
678
        }
679

    
680
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
681
        if(i>=0){
682
            int64_t pos= best_st->index_entries[i].pos;
683
            pos += best_ast->packet_size - best_ast->remaining;
684
            url_fseek(s->pb, pos + 8, SEEK_SET);
685
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
686

    
687
            assert(best_ast->remaining <= best_ast->packet_size);
688

    
689
            avi->stream_index= best_stream_index;
690
            if(!best_ast->remaining)
691
                best_ast->packet_size=
692
                best_ast->remaining= best_st->index_entries[i].size;
693
        }
694
    }
695

    
696
resync:
697
    if(avi->stream_index >= 0){
698
        AVStream *st= s->streams[ avi->stream_index ];
699
        AVIStream *ast= st->priv_data;
700
        int size;
701

    
702
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
703
            size= INT_MAX;
704
        else if(ast->sample_size < 32)
705
            size= 64*ast->sample_size;
706
        else
707
            size= ast->sample_size;
708

    
709
        if(size > ast->remaining)
710
            size= ast->remaining;
711
        avi->last_pkt_pos= url_ftell(pb);
712
        av_get_packet(pb, pkt, size);
713

    
714
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
715
            ast->has_pal=0;
716
            pkt->size += 4*256;
717
            pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
718
            if(pkt->data)
719
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
720
        }
721

    
722
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
723
            dstr = pkt->destruct;
724
            size = dv_produce_packet(avi->dv_demux, pkt,
725
                                    pkt->data, pkt->size);
726
            pkt->destruct = dstr;
727
            pkt->flags |= PKT_FLAG_KEY;
728
        } else {
729
            /* XXX: How to handle B-frames in AVI? */
730
            pkt->dts = ast->frame_offset;
731
//                pkt->dts += ast->start;
732
            if(ast->sample_size)
733
                pkt->dts /= ast->sample_size;
734
//av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
735
            pkt->stream_index = avi->stream_index;
736

    
737
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
738
                AVIndexEntry *e;
739
                int index;
740
                assert(st->index_entries);
741

    
742
                index= av_index_search_timestamp(st, pkt->dts, 0);
743
                e= &st->index_entries[index];
744

    
745
                if(index >= 0 && e->timestamp == ast->frame_offset){
746
                    if (e->flags & AVINDEX_KEYFRAME)
747
                        pkt->flags |= PKT_FLAG_KEY;
748
                }
749
            } else {
750
                pkt->flags |= PKT_FLAG_KEY;
751
            }
752
            if(ast->sample_size)
753
                ast->frame_offset += pkt->size;
754
            else
755
                ast->frame_offset++;
756
        }
757
        ast->remaining -= size;
758
        if(!ast->remaining){
759
            avi->stream_index= -1;
760
            ast->packet_size= 0;
761
        }
762

    
763
        return size;
764
    }
765

    
766
    memset(d, -1, sizeof(int)*8);
767
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
768
        int j;
769

    
770
        for(j=0; j<7; j++)
771
            d[j]= d[j+1];
772
        d[7]= get_byte(pb);
773

    
774
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
775

    
776
        n= get_stream_idx(d+2);
777
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
778
        if(i + size > avi->fsize || d[0]<0)
779
            continue;
780

    
781
        //parse ix##
782
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
783
        //parse JUNK
784
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
785
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
786
            url_fskip(pb, size);
787
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
788
            goto resync;
789
        }
790

    
791
        n= get_stream_idx(d);
792

    
793
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
794
            continue;
795

    
796
        //parse ##dc/##wb
797
        if(n < s->nb_streams){
798
            AVStream *st;
799
            AVIStream *ast;
800
            st = s->streams[n];
801
            ast = st->priv_data;
802

    
803
            if(s->nb_streams>=2){
804
                AVStream *st1  = s->streams[1];
805
                AVIStream *ast1= st1->priv_data;
806
                //workaround for broken small-file-bug402.avi
807
                if(   d[2] == 'w' && d[3] == 'b'
808
                   && n==0
809
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
810
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
811
                   && ast->prefix == 'd'*256+'c'
812
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
813
                  ){
814
                    n=1;
815
                    st = st1;
816
                    ast = ast1;
817
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
818
                }
819
            }
820

    
821

    
822
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
823
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
824
               || st->discard >= AVDISCARD_ALL){
825
                if(ast->sample_size) ast->frame_offset += pkt->size;
826
                else                 ast->frame_offset++;
827
                url_fskip(pb, size);
828
                goto resync;
829
            }
830

    
831
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
832
                int k = get_byte(pb);
833
                int last = (k + get_byte(pb) - 1) & 0xFF;
834

    
835
                get_le16(pb); //flags
836

    
837
                for (; k <= last; k++)
838
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
839
                ast->has_pal= 1;
840
                goto resync;
841
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
842
                         d[2]*256+d[3] == ast->prefix /*||
843
                         (d[2] == 'd' && d[3] == 'c') ||
844
                         (d[2] == 'w' && d[3] == 'b')*/) {
845

    
846
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
847
                if(d[2]*256+d[3] == ast->prefix)
848
                    ast->prefix_count++;
849
                else{
850
                    ast->prefix= d[2]*256+d[3];
851
                    ast->prefix_count= 0;
852
                }
853

    
854
                avi->stream_index= n;
855
                ast->packet_size= size + 8;
856
                ast->remaining= size;
857

    
858
                {
859
                    uint64_t pos= url_ftell(pb) - 8;
860
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
861
                        av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
862
                    }
863
                }
864
                goto resync;
865
            }
866
        }
867
    }
868

    
869
    return -1;
870
}
871

    
872
/* XXX: We make the implicit supposition that the positions are sorted
873
   for each stream. */
874
static int avi_read_idx1(AVFormatContext *s, int size)
875
{
876
    AVIContext *avi = s->priv_data;
877
    ByteIOContext *pb = s->pb;
878
    int nb_index_entries, i;
879
    AVStream *st;
880
    AVIStream *ast;
881
    unsigned int index, tag, flags, pos, len;
882
    unsigned last_pos= -1;
883

    
884
    nb_index_entries = size / 16;
885
    if (nb_index_entries <= 0)
886
        return -1;
887

    
888
    /* Read the entries and sort them in each stream component. */
889
    for(i = 0; i < nb_index_entries; i++) {
890
        tag = get_le32(pb);
891
        flags = get_le32(pb);
892
        pos = get_le32(pb);
893
        len = get_le32(pb);
894
#if defined(DEBUG_SEEK)
895
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
896
               i, tag, flags, pos, len);
897
#endif
898
        if(i==0 && pos > avi->movi_list)
899
            avi->movi_list= 0; //FIXME better check
900
        pos += avi->movi_list;
901

    
902
        index = ((tag & 0xff) - '0') * 10;
903
        index += ((tag >> 8) & 0xff) - '0';
904
        if (index >= s->nb_streams)
905
            continue;
906
        st = s->streams[index];
907
        ast = st->priv_data;
908

    
909
#if defined(DEBUG_SEEK)
910
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
911
#endif
912
        if(last_pos == pos)
913
            avi->non_interleaved= 1;
914
        else
915
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
916
        if(ast->sample_size)
917
            ast->cum_len += len;
918
        else
919
            ast->cum_len ++;
920
        last_pos= pos;
921
    }
922
    return 0;
923
}
924

    
925
static int guess_ni_flag(AVFormatContext *s){
926
    int i;
927
    int64_t last_start=0;
928
    int64_t first_end= INT64_MAX;
929

    
930
    for(i=0; i<s->nb_streams; i++){
931
        AVStream *st = s->streams[i];
932
        int n= st->nb_index_entries;
933

    
934
        if(n <= 0)
935
            continue;
936

    
937
        if(st->index_entries[0].pos > last_start)
938
            last_start= st->index_entries[0].pos;
939
        if(st->index_entries[n-1].pos < first_end)
940
            first_end= st->index_entries[n-1].pos;
941
    }
942
    return last_start > first_end;
943
}
944

    
945
static int avi_load_index(AVFormatContext *s)
946
{
947
    AVIContext *avi = s->priv_data;
948
    ByteIOContext *pb = s->pb;
949
    uint32_t tag, size;
950
    int64_t pos= url_ftell(pb);
951

    
952
    url_fseek(pb, avi->movi_end, SEEK_SET);
953
#ifdef DEBUG_SEEK
954
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
955
#endif
956
    for(;;) {
957
        if (url_feof(pb))
958
            break;
959
        tag = get_le32(pb);
960
        size = get_le32(pb);
961
#ifdef DEBUG_SEEK
962
        printf("tag=%c%c%c%c size=0x%x\n",
963
               tag & 0xff,
964
               (tag >> 8) & 0xff,
965
               (tag >> 16) & 0xff,
966
               (tag >> 24) & 0xff,
967
               size);
968
#endif
969
        switch(tag) {
970
        case MKTAG('i', 'd', 'x', '1'):
971
            if (avi_read_idx1(s, size) < 0)
972
                goto skip;
973
            else
974
                goto the_end;
975
            break;
976
        default:
977
        skip:
978
            size += (size & 1);
979
            url_fskip(pb, size);
980
            break;
981
        }
982
    }
983
 the_end:
984
    url_fseek(pb, pos, SEEK_SET);
985
    return 0;
986
}
987

    
988
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
989
{
990
    AVIContext *avi = s->priv_data;
991
    AVStream *st;
992
    int i, index;
993
    int64_t pos;
994

    
995
    if (!avi->index_loaded) {
996
        /* we only load the index on demand */
997
        avi_load_index(s);
998
        avi->index_loaded = 1;
999
    }
1000
    assert(stream_index>= 0);
1001

    
1002
    st = s->streams[stream_index];
1003
    index= av_index_search_timestamp(st, timestamp, flags);
1004
    if(index<0)
1005
        return -1;
1006

    
1007
    /* find the position */
1008
    pos = st->index_entries[index].pos;
1009
    timestamp = st->index_entries[index].timestamp;
1010

    
1011
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1012

    
1013
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
1014
        /* One and only one real stream for DV in AVI, and it has video  */
1015
        /* offsets. Calling with other stream indexes should have failed */
1016
        /* the av_index_search_timestamp call above.                     */
1017
        assert(stream_index == 0);
1018

    
1019
        /* Feed the DV video stream version of the timestamp to the */
1020
        /* DV demux so it can synthesize correct timestamps.        */
1021
        dv_offset_reset(avi->dv_demux, timestamp);
1022

    
1023
        url_fseek(s->pb, pos, SEEK_SET);
1024
        avi->stream_index= -1;
1025
        return 0;
1026
    }
1027

    
1028
    for(i = 0; i < s->nb_streams; i++) {
1029
        AVStream *st2 = s->streams[i];
1030
        AVIStream *ast2 = st2->priv_data;
1031

    
1032
        ast2->packet_size=
1033
        ast2->remaining= 0;
1034

    
1035
        if (st2->nb_index_entries <= 0)
1036
            continue;
1037

    
1038
//        assert(st2->codec->block_align);
1039
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1040
        index = av_index_search_timestamp(
1041
                st2,
1042
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1043
                flags | AVSEEK_FLAG_BACKWARD);
1044
        if(index<0)
1045
            index=0;
1046

    
1047
        if(!avi->non_interleaved){
1048
            while(index>0 && st2->index_entries[index].pos > pos)
1049
                index--;
1050
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1051
                index++;
1052
        }
1053

    
1054
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1055
        /* extract the current frame number */
1056
        ast2->frame_offset = st2->index_entries[index].timestamp;
1057
        if(ast2->sample_size)
1058
            ast2->frame_offset *=ast2->sample_size;
1059
    }
1060

    
1061
    /* do the seek */
1062
    url_fseek(s->pb, pos, SEEK_SET);
1063
    avi->stream_index= -1;
1064
    return 0;
1065
}
1066

    
1067
static int avi_read_close(AVFormatContext *s)
1068
{
1069
    int i;
1070
    AVIContext *avi = s->priv_data;
1071

    
1072
    for(i=0;i<s->nb_streams;i++) {
1073
        AVStream *st = s->streams[i];
1074
        av_free(st->codec->palctrl);
1075
    }
1076

    
1077
    if (avi->dv_demux)
1078
        av_free(avi->dv_demux);
1079

    
1080
    return 0;
1081
}
1082

    
1083
static int avi_probe(AVProbeData *p)
1084
{
1085
    int i;
1086

    
1087
    /* check file header */
1088
    for(i=0; avi_headers[i][0]; i++)
1089
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1090
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1091
            return AVPROBE_SCORE_MAX;
1092

    
1093
    return 0;
1094
}
1095

    
1096
AVInputFormat avi_demuxer = {
1097
    "avi",
1098
    NULL_IF_CONFIG_SMALL("AVI format"),
1099
    sizeof(AVIContext),
1100
    avi_probe,
1101
    avi_read_header,
1102
    avi_read_packet,
1103
    avi_read_close,
1104
    avi_read_seek,
1105
};