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ffmpeg / libavformat / avidec.c @ 4a030a1f

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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
    offset_t movi_list;
55
    int index_loaded;
56
    int is_odml;
57
    int non_interleaved;
58
    int stream_index;
59
    DVDemuxContext* dv_demux;
60
} AVIContext;
61

    
62
static const char avi_headers[][8] = {
63
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
64
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
65
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
66
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
67
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
68
    { 0 }
69
};
70

    
71
static int avi_load_index(AVFormatContext *s);
72
static int guess_ni_flag(AVFormatContext *s);
73

    
74
#ifdef DEBUG
75
static void print_tag(const char *str, unsigned int tag, int size)
76
{
77
    printf("%s: tag=%c%c%c%c size=0x%x\n",
78
           str, tag & 0xff,
79
           (tag >> 8) & 0xff,
80
           (tag >> 16) & 0xff,
81
           (tag >> 24) & 0xff,
82
           size);
83
}
84
#endif
85

    
86
static int get_riff(AVIContext *avi, ByteIOContext *pb)
87
{
88
    char header[8];
89
    int i;
90

    
91
    /* check RIFF header */
92
    get_buffer(pb, header, 4);
93
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
94
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
95
    get_buffer(pb, header+4, 4);
96

    
97
    for(i=0; avi_headers[i][0]; i++)
98
        if(!memcmp(header, avi_headers[i], 8))
99
            break;
100
    if(!avi_headers[i][0])
101
        return -1;
102

    
103
    if(header[7] == 0x19)
104
        av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
105

    
106
    return 0;
107
}
108

    
109
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
110
    AVIContext *avi = s->priv_data;
111
    ByteIOContext *pb = s->pb;
112
    int longs_pre_entry= get_le16(pb);
113
    int index_sub_type = get_byte(pb);
114
    int index_type     = get_byte(pb);
115
    int entries_in_use = get_le32(pb);
116
    int chunk_id       = get_le32(pb);
117
    int64_t base       = get_le64(pb);
118
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
119
    AVStream *st;
120
    AVIStream *ast;
121
    int i;
122
    int64_t last_pos= -1;
123
    int64_t filesize= url_fsize(s->pb);
124

    
125
#ifdef DEBUG_SEEK
126
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
127
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
128
#endif
129

    
130
    if(stream_id > s->nb_streams || stream_id < 0)
131
        return -1;
132
    st= s->streams[stream_id];
133
    ast = st->priv_data;
134

    
135
    if(index_sub_type)
136
        return -1;
137

    
138
    get_le32(pb);
139

    
140
    if(index_type && longs_pre_entry != 2)
141
        return -1;
142
    if(index_type>1)
143
        return -1;
144

    
145
    if(filesize > 0 && base >= filesize){
146
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
147
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
148
            base &= 0xFFFFFFFF;
149
        else
150
            return -1;
151
    }
152

    
153
    for(i=0; i<entries_in_use; i++){
154
        if(index_type){
155
            int64_t pos= get_le32(pb) + base - 8;
156
            int len    = get_le32(pb);
157
            int key= len >= 0;
158
            len &= 0x7FFFFFFF;
159

    
160
#ifdef DEBUG_SEEK
161
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
162
#endif
163
            if(last_pos == pos || pos == base - 8)
164
                avi->non_interleaved= 1;
165
            else
166
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
167

    
168
            if(ast->sample_size)
169
                ast->cum_len += len;
170
            else
171
                ast->cum_len ++;
172
            last_pos= pos;
173
        }else{
174
            int64_t offset, pos;
175
            int duration;
176
            offset = get_le64(pb);
177
            get_le32(pb);       /* size */
178
            duration = get_le32(pb);
179
            pos = url_ftell(pb);
180

    
181
            url_fseek(pb, offset+8, SEEK_SET);
182
            read_braindead_odml_indx(s, frame_num);
183
            frame_num += duration;
184

    
185
            url_fseek(pb, pos, SEEK_SET);
186
        }
187
    }
188
    avi->index_loaded=1;
189
    return 0;
190
}
191

    
192
static void clean_index(AVFormatContext *s){
193
    int i;
194
    int64_t j;
195

    
196
    for(i=0; i<s->nb_streams; i++){
197
        AVStream *st = s->streams[i];
198
        AVIStream *ast = st->priv_data;
199
        int n= st->nb_index_entries;
200
        int max= ast->sample_size;
201
        int64_t pos, size, ts;
202

    
203
        if(n != 1 || ast->sample_size==0)
204
            continue;
205

    
206
        while(max < 1024) max+=max;
207

    
208
        pos= st->index_entries[0].pos;
209
        size= st->index_entries[0].size;
210
        ts= st->index_entries[0].timestamp;
211

    
212
        for(j=0; j<size; j+=max){
213
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
214
        }
215
    }
216
}
217

    
218
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
219
{
220
    offset_t i = url_ftell(pb);
221
    size += (size & 1);
222
    get_strz(pb, buf, maxlen);
223
    url_fseek(pb, i+size, SEEK_SET);
224
    return 0;
225
}
226

    
227
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
228
{
229
    AVIContext *avi = s->priv_data;
230
    ByteIOContext *pb = s->pb;
231
    uint32_t tag, tag1, handler;
232
    int codec_type, stream_index, frame_period, bit_rate;
233
    unsigned int size, nb_frames;
234
    int i;
235
    AVStream *st;
236
    AVIStream *ast = NULL;
237
    char str_track[4];
238
    int avih_width=0, avih_height=0;
239
    int amv_file_format=0;
240

    
241
    avi->stream_index= -1;
242

    
243
    if (get_riff(avi, pb) < 0)
244
        return -1;
245

    
246
    avi->fsize = url_fsize(pb);
247
    if(avi->fsize<=0)
248
        avi->fsize= avi->riff_end;
249

    
250
    /* first list tag */
251
    stream_index = -1;
252
    codec_type = -1;
253
    frame_period = 0;
254
    for(;;) {
255
        if (url_feof(pb))
256
            goto fail;
257
        tag = get_le32(pb);
258
        size = get_le32(pb);
259
#ifdef DEBUG
260
        print_tag("tag", tag, size);
261
#endif
262

    
263
        switch(tag) {
264
        case MKTAG('L', 'I', 'S', 'T'):
265
            /* ignored, except when start of video packets */
266
            tag1 = get_le32(pb);
267
#ifdef DEBUG
268
            print_tag("list", tag1, 0);
269
#endif
270
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
271
                avi->movi_list = url_ftell(pb) - 4;
272
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
273
                else     avi->movi_end = url_fsize(pb);
274
#ifdef DEBUG
275
                printf("movi end=%"PRIx64"\n", avi->movi_end);
276
#endif
277
                goto end_of_header;
278
            }
279
            break;
280
        case MKTAG('d', 'm', 'l', 'h'):
281
            avi->is_odml = 1;
282
            url_fskip(pb, size + (size & 1));
283
            break;
284
        case MKTAG('a', 'm', 'v', 'h'):
285
            amv_file_format=1;
286
        case MKTAG('a', 'v', 'i', 'h'):
287
            /* avi header */
288
            /* using frame_period is bad idea */
289
            frame_period = get_le32(pb);
290
            bit_rate = get_le32(pb) * 8;
291
            get_le32(pb);
292
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
293

    
294
            url_fskip(pb, 2 * 4);
295
            get_le32(pb);
296
            get_le32(pb);
297
            avih_width=get_le32(pb);
298
            avih_height=get_le32(pb);
299

    
300
            url_fskip(pb, size - 10 * 4);
301
            break;
302
        case MKTAG('s', 't', 'r', 'h'):
303
            /* stream header */
304

    
305
            tag1 = get_le32(pb);
306
            handler = get_le32(pb); /* codec tag */
307

    
308
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
309
                url_fskip(pb, size - 8);
310
                break;
311
            }else{
312
                stream_index++;
313
                st = av_new_stream(s, stream_index);
314
                if (!st)
315
                    goto fail;
316

    
317
                ast = av_mallocz(sizeof(AVIStream));
318
                if (!ast)
319
                    goto fail;
320
                st->priv_data = ast;
321
            }
322
            if(amv_file_format)
323
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
324

    
325
#ifdef DEBUG
326
            print_tag("strh", tag1, -1);
327
#endif
328
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
329
                int64_t dv_dur;
330

    
331
                /*
332
                 * After some consideration -- I don't think we
333
                 * have to support anything but DV in a type1 AVIs.
334
                 */
335
                if (s->nb_streams != 1)
336
                    goto fail;
337

    
338
                if (handler != MKTAG('d', 'v', 's', 'd') &&
339
                    handler != MKTAG('d', 'v', 'h', 'd') &&
340
                    handler != MKTAG('d', 'v', 's', 'l'))
341
                   goto fail;
342

    
343
                ast = s->streams[0]->priv_data;
344
                av_freep(&s->streams[0]->codec->extradata);
345
                av_freep(&s->streams[0]);
346
                s->nb_streams = 0;
347
                if (ENABLE_DV_DEMUXER) {
348
                    avi->dv_demux = dv_init_demux(s);
349
                    if (!avi->dv_demux)
350
                        goto fail;
351
                }
352
                s->streams[0]->priv_data = ast;
353
                url_fskip(pb, 3 * 4);
354
                ast->scale = get_le32(pb);
355
                ast->rate = get_le32(pb);
356
                url_fskip(pb, 4);  /* start time */
357

    
358
                dv_dur = get_le32(pb);
359
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
360
                    dv_dur *= AV_TIME_BASE;
361
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
362
                }
363
                /*
364
                 * else, leave duration alone; timing estimation in utils.c
365
                 *      will make a guess based on bit rate.
366
                 */
367

    
368
                stream_index = s->nb_streams - 1;
369
                url_fskip(pb, size - 9*4);
370
                break;
371
            }
372

    
373
            assert(stream_index < s->nb_streams);
374
            st->codec->stream_codec_tag= handler;
375

    
376
            get_le32(pb); /* flags */
377
            get_le16(pb); /* priority */
378
            get_le16(pb); /* language */
379
            get_le32(pb); /* initial frame */
380
            ast->scale = get_le32(pb);
381
            ast->rate = get_le32(pb);
382
            if(!(ast->scale && ast->rate)){
383
            if(frame_period){
384
                ast->rate = 1000000;
385
                ast->scale = frame_period;
386
            }else{
387
                ast->rate = 25;
388
                ast->scale = 1;
389
            }
390
            }
391
            av_set_pts_info(st, 64, ast->scale, ast->rate);
392

    
393
            ast->cum_len=get_le32(pb); /* start */
394
            nb_frames = get_le32(pb);
395

    
396
            st->start_time = 0;
397
            st->duration = nb_frames;
398
            get_le32(pb); /* buffer size */
399
            get_le32(pb); /* quality */
400
            ast->sample_size = get_le32(pb); /* sample ssize */
401
            ast->cum_len *= FFMAX(1, ast->sample_size);
402
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
403

    
404
            switch(tag1) {
405
            case MKTAG('v', 'i', 'd', 's'):
406
                codec_type = CODEC_TYPE_VIDEO;
407

    
408
                ast->sample_size = 0;
409
                break;
410
            case MKTAG('a', 'u', 'd', 's'):
411
                codec_type = CODEC_TYPE_AUDIO;
412
                break;
413
            case MKTAG('t', 'x', 't', 's'):
414
                //FIXME
415
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
416
                break;
417
            default:
418
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
419
                goto fail;
420
            }
421
            ast->frame_offset= ast->cum_len;
422
            url_fskip(pb, size - 12 * 4);
423
            break;
424
        case MKTAG('s', 't', 'r', 'f'):
425
            /* stream header */
426
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
427
                url_fskip(pb, size);
428
            } else {
429
                st = s->streams[stream_index];
430
                switch(codec_type) {
431
                case CODEC_TYPE_VIDEO:
432
                    if(amv_file_format){
433
                        st->codec->width=avih_width;
434
                        st->codec->height=avih_height;
435
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
436
                        st->codec->codec_id = CODEC_ID_AMV;
437
                        url_fskip(pb, size);
438
                        break;
439
                    }
440
                    get_le32(pb); /* size */
441
                    st->codec->width = get_le32(pb);
442
                    st->codec->height = get_le32(pb);
443
                    get_le16(pb); /* panes */
444
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
445
                    tag1 = get_le32(pb);
446
                    get_le32(pb); /* ImageSize */
447
                    get_le32(pb); /* XPelsPerMeter */
448
                    get_le32(pb); /* YPelsPerMeter */
449
                    get_le32(pb); /* ClrUsed */
450
                    get_le32(pb); /* ClrImportant */
451

    
452
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
453
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
454
                        st->codec->codec_tag = tag1;
455
                        st->codec->codec_id = CODEC_ID_XSUB;
456
                        break;
457
                    }
458

    
459
                    if(size > 10*4 && size<(1<<30)){
460
                        st->codec->extradata_size= size - 10*4;
461
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
462
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
463
                    }
464

    
465
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
466
                        get_byte(pb);
467

    
468
                    /* Extract palette from extradata if bpp <= 8 */
469
                    /* This code assumes that extradata contains only palette */
470
                    /* This is true for all paletted codecs implemented in ffmpeg */
471
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
472
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
473
#ifdef WORDS_BIGENDIAN
474
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
475
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
476
#else
477
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
478
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
479
#endif
480
                        st->codec->palctrl->palette_changed = 1;
481
                    }
482

    
483
#ifdef DEBUG
484
                    print_tag("video", tag1, 0);
485
#endif
486
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
487
                    st->codec->codec_tag = tag1;
488
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
489
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
490
//                    url_fskip(pb, size - 5 * 4);
491
                    break;
492
                case CODEC_TYPE_AUDIO:
493
                    get_wav_header(pb, st->codec, size);
494
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
495
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
496
                        ast->sample_size= st->codec->block_align;
497
                    }
498
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
499
                        url_fskip(pb, 1);
500
                    /* Force parsing as several audio frames can be in
501
                     * one packet and timestamps refer to packet start*/
502
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
503
                    /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
504
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
505
                        st->need_parsing = AVSTREAM_PARSE_NONE;
506
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
507
                     * audio in the header but have Axan as stream_code_tag. */
508
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
509
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
510
                        st->codec->codec_tag = 0;
511
                    }
512
                    if (amv_file_format)
513
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
514
                    break;
515
                default:
516
                    st->codec->codec_type = CODEC_TYPE_DATA;
517
                    st->codec->codec_id= CODEC_ID_NONE;
518
                    st->codec->codec_tag= 0;
519
                    url_fskip(pb, size);
520
                    break;
521
                }
522
            }
523
            break;
524
        case MKTAG('i', 'n', 'd', 'x'):
525
            i= url_ftell(pb);
526
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
527
                read_braindead_odml_indx(s, 0);
528
            }
529
            url_fseek(pb, i+size, SEEK_SET);
530
            break;
531
        case MKTAG('v', 'p', 'r', 'p'):
532
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
533
                AVRational active, active_aspect;
534

    
535
                st = s->streams[stream_index];
536
                get_le32(pb);
537
                get_le32(pb);
538
                get_le32(pb);
539
                get_le32(pb);
540
                get_le32(pb);
541

    
542
                active_aspect.den= get_le16(pb);
543
                active_aspect.num= get_le16(pb);
544
                active.num       = get_le32(pb);
545
                active.den       = get_le32(pb);
546
                get_le32(pb); //nbFieldsPerFrame
547

    
548
                if(active_aspect.num && active_aspect.den && active.num && active.den){
549
                    st->codec->sample_aspect_ratio= av_div_q(active_aspect, active);
550
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
551
                }
552
                size -= 9*4;
553
            }
554
            url_fseek(pb, size, SEEK_CUR);
555
            break;
556
        case MKTAG('I', 'N', 'A', 'M'):
557
            avi_read_tag(pb, s->title, sizeof(s->title), size);
558
            break;
559
        case MKTAG('I', 'A', 'R', 'T'):
560
            avi_read_tag(pb, s->author, sizeof(s->author), size);
561
            break;
562
        case MKTAG('I', 'C', 'O', 'P'):
563
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
564
            break;
565
        case MKTAG('I', 'C', 'M', 'T'):
566
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
567
            break;
568
        case MKTAG('I', 'G', 'N', 'R'):
569
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
570
            break;
571
        case MKTAG('I', 'P', 'R', 'D'):
572
            avi_read_tag(pb, s->album, sizeof(s->album), size);
573
            break;
574
        case MKTAG('I', 'P', 'R', 'T'):
575
            avi_read_tag(pb, str_track, sizeof(str_track), size);
576
            sscanf(str_track, "%d", &s->track);
577
            break;
578
        default:
579
            if(size > 1000000){
580
                av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
581
                                        "ill ignore it and try to continue anyway\n");
582
                avi->movi_list = url_ftell(pb) - 4;
583
                avi->movi_end  = url_fsize(pb);
584
                goto end_of_header;
585
            }
586
            /* skip tag */
587
            size += (size & 1);
588
            url_fskip(pb, size);
589
            break;
590
        }
591
    }
592
 end_of_header:
593
    /* check stream number */
594
    if (stream_index != s->nb_streams - 1) {
595
    fail:
596
        for(i=0;i<s->nb_streams;i++) {
597
            av_freep(&s->streams[i]->codec->extradata);
598
            av_freep(&s->streams[i]);
599
        }
600
        return -1;
601
    }
602

    
603
    if(!avi->index_loaded && !url_is_streamed(pb))
604
        avi_load_index(s);
605
    avi->index_loaded = 1;
606
    avi->non_interleaved |= guess_ni_flag(s);
607
    if(avi->non_interleaved)
608
        clean_index(s);
609

    
610
    return 0;
611
}
612

    
613
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
614
{
615
    AVIContext *avi = s->priv_data;
616
    ByteIOContext *pb = s->pb;
617
    int n, d[8], size;
618
    offset_t i, sync;
619
    void* dstr;
620

    
621
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
622
        size = dv_get_packet(avi->dv_demux, pkt);
623
        if (size >= 0)
624
            return size;
625
    }
626

    
627
    if(avi->non_interleaved){
628
        int best_stream_index = 0;
629
        AVStream *best_st= NULL;
630
        AVIStream *best_ast;
631
        int64_t best_ts= INT64_MAX;
632
        int i;
633

    
634
        for(i=0; i<s->nb_streams; i++){
635
            AVStream *st = s->streams[i];
636
            AVIStream *ast = st->priv_data;
637
            int64_t ts= ast->frame_offset;
638

    
639
            if(ast->sample_size)
640
                ts /= ast->sample_size;
641
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
642

    
643
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
644
            if(ts < best_ts){
645
                best_ts= ts;
646
                best_st= st;
647
                best_stream_index= i;
648
            }
649
        }
650
        best_ast = best_st->priv_data;
651
        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
652
        if(best_ast->remaining)
653
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
654
        else
655
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
656

    
657
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
658
        if(i>=0){
659
            int64_t pos= best_st->index_entries[i].pos;
660
            pos += best_ast->packet_size - best_ast->remaining;
661
            url_fseek(s->pb, pos + 8, SEEK_SET);
662
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
663

    
664
            assert(best_ast->remaining <= best_ast->packet_size);
665

    
666
            avi->stream_index= best_stream_index;
667
            if(!best_ast->remaining)
668
                best_ast->packet_size=
669
                best_ast->remaining= best_st->index_entries[i].size;
670
        }
671
    }
672

    
673
resync:
674
    if(avi->stream_index >= 0){
675
        AVStream *st= s->streams[ avi->stream_index ];
676
        AVIStream *ast= st->priv_data;
677
        int size;
678

    
679
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
680
            size= INT_MAX;
681
        else if(ast->sample_size < 32)
682
            size= 64*ast->sample_size;
683
        else
684
            size= ast->sample_size;
685

    
686
        if(size > ast->remaining)
687
            size= ast->remaining;
688
        av_get_packet(pb, pkt, size);
689

    
690
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
691
            ast->has_pal=0;
692
            pkt->size += 4*256;
693
            pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
694
            if(pkt->data)
695
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
696
        }
697

    
698
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
699
            dstr = pkt->destruct;
700
            size = dv_produce_packet(avi->dv_demux, pkt,
701
                                    pkt->data, pkt->size);
702
            pkt->destruct = dstr;
703
            pkt->flags |= PKT_FLAG_KEY;
704
        } else {
705
            /* XXX: how to handle B frames in avi ? */
706
            pkt->dts = ast->frame_offset;
707
//                pkt->dts += ast->start;
708
            if(ast->sample_size)
709
                pkt->dts /= ast->sample_size;
710
//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);
711
            pkt->stream_index = avi->stream_index;
712

    
713
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
714
                AVIndexEntry *e;
715
                int index;
716
                assert(st->index_entries);
717

    
718
                index= av_index_search_timestamp(st, pkt->dts, 0);
719
                e= &st->index_entries[index];
720

    
721
                if(index >= 0 && e->timestamp == ast->frame_offset){
722
                    if (e->flags & AVINDEX_KEYFRAME)
723
                        pkt->flags |= PKT_FLAG_KEY;
724
                }
725
            } else {
726
                pkt->flags |= PKT_FLAG_KEY;
727
            }
728
            if(ast->sample_size)
729
                ast->frame_offset += pkt->size;
730
            else
731
                ast->frame_offset++;
732
        }
733
        ast->remaining -= size;
734
        if(!ast->remaining){
735
            avi->stream_index= -1;
736
            ast->packet_size= 0;
737
        }
738

    
739
        return size;
740
    }
741

    
742
    memset(d, -1, sizeof(int)*8);
743
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
744
        int j;
745

    
746
        for(j=0; j<7; j++)
747
            d[j]= d[j+1];
748
        d[7]= get_byte(pb);
749

    
750
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
751

    
752
        if(    d[2] >= '0' && d[2] <= '9'
753
            && d[3] >= '0' && d[3] <= '9'){
754
            n= (d[2] - '0') * 10 + (d[3] - '0');
755
        }else{
756
            n= 100; //invalid stream id
757
        }
758
//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);
759
        if(i + size > avi->fsize || d[0]<0)
760
            continue;
761

    
762
        //parse ix##
763
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
764
        //parse JUNK
765
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
766
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
767
            url_fskip(pb, size);
768
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
769
            goto resync;
770
        }
771

    
772
        if(    d[0] >= '0' && d[0] <= '9'
773
            && d[1] >= '0' && d[1] <= '9'){
774
            n= (d[0] - '0') * 10 + (d[1] - '0');
775
        }else{
776
            n= 100; //invalid stream id
777
        }
778

    
779
        //parse ##dc/##wb
780
        if(n < s->nb_streams){
781
            AVStream *st;
782
            AVIStream *ast;
783
            st = s->streams[n];
784
            ast = st->priv_data;
785

    
786
            if(s->nb_streams>=2){
787
                AVStream *st1  = s->streams[1];
788
                AVIStream *ast1= st1->priv_data;
789
                //workaround for broken small-file-bug402.avi
790
                if(   d[2] == 'w' && d[3] == 'b'
791
                   && n==0
792
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
793
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
794
                   && ast->prefix == 'd'*256+'c'
795
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
796
                  ){
797
                    n=1;
798
                    st = st1;
799
                    ast = ast1;
800
                    av_log(s, AV_LOG_WARNING, "Invalid stream+prefix combination, assuming audio\n");
801
                }
802
            }
803

    
804

    
805
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
806
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
807
               || st->discard >= AVDISCARD_ALL){
808
                if(ast->sample_size) ast->frame_offset += pkt->size;
809
                else                 ast->frame_offset++;
810
                url_fskip(pb, size);
811
                goto resync;
812
            }
813

    
814
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
815
                int k = get_byte(pb);
816
                int last = (k + get_byte(pb) - 1) & 0xFF;
817

    
818
                get_le16(pb); //flags
819

    
820
                for (; k <= last; k++)
821
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
822
                ast->has_pal= 1;
823
                goto resync;
824
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
825
                         d[2]*256+d[3] == ast->prefix /*||
826
                         (d[2] == 'd' && d[3] == 'c') ||
827
                         (d[2] == 'w' && d[3] == 'b')*/) {
828

    
829
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
830
                if(d[2]*256+d[3] == ast->prefix)
831
                    ast->prefix_count++;
832
                else{
833
                    ast->prefix= d[2]*256+d[3];
834
                    ast->prefix_count= 0;
835
                }
836

    
837
                avi->stream_index= n;
838
                ast->packet_size= size + 8;
839
                ast->remaining= size;
840

    
841
                {
842
                    uint64_t pos= url_ftell(pb) - 8;
843
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
844
                        av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
845
                    }
846
                }
847
                goto resync;
848
            }
849
        }
850
    }
851

    
852
    return -1;
853
}
854

    
855
/* XXX: we make the implicit supposition that the position are sorted
856
   for each stream */
857
static int avi_read_idx1(AVFormatContext *s, int size)
858
{
859
    AVIContext *avi = s->priv_data;
860
    ByteIOContext *pb = s->pb;
861
    int nb_index_entries, i;
862
    AVStream *st;
863
    AVIStream *ast;
864
    unsigned int index, tag, flags, pos, len;
865
    unsigned last_pos= -1;
866

    
867
    nb_index_entries = size / 16;
868
    if (nb_index_entries <= 0)
869
        return -1;
870

    
871
    /* read the entries and sort them in each stream component */
872
    for(i = 0; i < nb_index_entries; i++) {
873
        tag = get_le32(pb);
874
        flags = get_le32(pb);
875
        pos = get_le32(pb);
876
        len = get_le32(pb);
877
#if defined(DEBUG_SEEK)
878
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
879
               i, tag, flags, pos, len);
880
#endif
881
        if(i==0 && pos > avi->movi_list)
882
            avi->movi_list= 0; //FIXME better check
883
        pos += avi->movi_list;
884

    
885
        index = ((tag & 0xff) - '0') * 10;
886
        index += ((tag >> 8) & 0xff) - '0';
887
        if (index >= s->nb_streams)
888
            continue;
889
        st = s->streams[index];
890
        ast = st->priv_data;
891

    
892
#if defined(DEBUG_SEEK)
893
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
894
#endif
895
        if(last_pos == pos)
896
            avi->non_interleaved= 1;
897
        else
898
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
899
        if(ast->sample_size)
900
            ast->cum_len += len;
901
        else
902
            ast->cum_len ++;
903
        last_pos= pos;
904
    }
905
    return 0;
906
}
907

    
908
static int guess_ni_flag(AVFormatContext *s){
909
    int i;
910
    int64_t last_start=0;
911
    int64_t first_end= INT64_MAX;
912

    
913
    for(i=0; i<s->nb_streams; i++){
914
        AVStream *st = s->streams[i];
915
        int n= st->nb_index_entries;
916

    
917
        if(n <= 0)
918
            continue;
919

    
920
        if(st->index_entries[0].pos > last_start)
921
            last_start= st->index_entries[0].pos;
922
        if(st->index_entries[n-1].pos < first_end)
923
            first_end= st->index_entries[n-1].pos;
924
    }
925
    return last_start > first_end;
926
}
927

    
928
static int avi_load_index(AVFormatContext *s)
929
{
930
    AVIContext *avi = s->priv_data;
931
    ByteIOContext *pb = s->pb;
932
    uint32_t tag, size;
933
    offset_t pos= url_ftell(pb);
934

    
935
    url_fseek(pb, avi->movi_end, SEEK_SET);
936
#ifdef DEBUG_SEEK
937
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
938
#endif
939
    for(;;) {
940
        if (url_feof(pb))
941
            break;
942
        tag = get_le32(pb);
943
        size = get_le32(pb);
944
#ifdef DEBUG_SEEK
945
        printf("tag=%c%c%c%c size=0x%x\n",
946
               tag & 0xff,
947
               (tag >> 8) & 0xff,
948
               (tag >> 16) & 0xff,
949
               (tag >> 24) & 0xff,
950
               size);
951
#endif
952
        switch(tag) {
953
        case MKTAG('i', 'd', 'x', '1'):
954
            if (avi_read_idx1(s, size) < 0)
955
                goto skip;
956
            else
957
                goto the_end;
958
            break;
959
        default:
960
        skip:
961
            size += (size & 1);
962
            url_fskip(pb, size);
963
            break;
964
        }
965
    }
966
 the_end:
967
    url_fseek(pb, pos, SEEK_SET);
968
    return 0;
969
}
970

    
971
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
972
{
973
    AVIContext *avi = s->priv_data;
974
    AVStream *st;
975
    int i, index;
976
    int64_t pos;
977

    
978
    if (!avi->index_loaded) {
979
        /* we only load the index on demand */
980
        avi_load_index(s);
981
        avi->index_loaded = 1;
982
    }
983
    assert(stream_index>= 0);
984

    
985
    st = s->streams[stream_index];
986
    index= av_index_search_timestamp(st, timestamp, flags);
987
    if(index<0)
988
        return -1;
989

    
990
    /* find the position */
991
    pos = st->index_entries[index].pos;
992
    timestamp = st->index_entries[index].timestamp;
993

    
994
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
995

    
996
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
997
        /* One and only one real stream for DV in AVI, and it has video  */
998
        /* offsets. Calling with other stream indices should have failed */
999
        /* the av_index_search_timestamp call above.                     */
1000
        assert(stream_index == 0);
1001

    
1002
        /* Feed the DV video stream version of the timestamp to the */
1003
        /* DV demux so it can synth correct timestamps              */
1004
        dv_offset_reset(avi->dv_demux, timestamp);
1005

    
1006
        url_fseek(s->pb, pos, SEEK_SET);
1007
        avi->stream_index= -1;
1008
        return 0;
1009
    }
1010

    
1011
    for(i = 0; i < s->nb_streams; i++) {
1012
        AVStream *st2 = s->streams[i];
1013
        AVIStream *ast2 = st2->priv_data;
1014

    
1015
        ast2->packet_size=
1016
        ast2->remaining= 0;
1017

    
1018
        if (st2->nb_index_entries <= 0)
1019
            continue;
1020

    
1021
//        assert(st2->codec->block_align);
1022
        assert(st2->time_base.den == ast2->rate);
1023
        assert(st2->time_base.num == ast2->scale);
1024
        index = av_index_search_timestamp(
1025
                st2,
1026
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1027
                flags | AVSEEK_FLAG_BACKWARD);
1028
        if(index<0)
1029
            index=0;
1030

    
1031
        if(!avi->non_interleaved){
1032
            while(index>0 && st2->index_entries[index].pos > pos)
1033
                index--;
1034
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1035
                index++;
1036
        }
1037

    
1038
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1039
        /* extract the current frame number */
1040
        ast2->frame_offset = st2->index_entries[index].timestamp;
1041
        if(ast2->sample_size)
1042
            ast2->frame_offset *=ast2->sample_size;
1043
    }
1044

    
1045
    /* do the seek */
1046
    url_fseek(s->pb, pos, SEEK_SET);
1047
    avi->stream_index= -1;
1048
    return 0;
1049
}
1050

    
1051
static int avi_read_close(AVFormatContext *s)
1052
{
1053
    int i;
1054
    AVIContext *avi = s->priv_data;
1055

    
1056
    for(i=0;i<s->nb_streams;i++) {
1057
        AVStream *st = s->streams[i];
1058
        AVIStream *ast = st->priv_data;
1059
        av_free(ast);
1060
        av_free(st->codec->palctrl);
1061
    }
1062

    
1063
    if (avi->dv_demux)
1064
        av_free(avi->dv_demux);
1065

    
1066
    return 0;
1067
}
1068

    
1069
static int avi_probe(AVProbeData *p)
1070
{
1071
    int i;
1072

    
1073
    /* check file header */
1074
    for(i=0; avi_headers[i][0]; i++)
1075
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1076
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1077
            return AVPROBE_SCORE_MAX;
1078

    
1079
    return 0;
1080
}
1081

    
1082
AVInputFormat avi_demuxer = {
1083
    "avi",
1084
    "avi format",
1085
    sizeof(AVIContext),
1086
    avi_probe,
1087
    avi_read_header,
1088
    avi_read_packet,
1089
    avi_read_close,
1090
    avi_read_seek,
1091
};