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ffmpeg / libavformat / avidec.c @ 49fb20cb

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

    
28
#undef NDEBUG
29
#include <assert.h>
30

    
31
//#define DEBUG
32
//#define DEBUG_SEEK
33

    
34
typedef struct AVIStream {
35
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
36
                         (used to compute the pts) */
37
    int remaining;
38
    int packet_size;
39

    
40
    int scale;
41
    int rate;
42
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
43

    
44
    int64_t cum_len; /* temporary storage (used during seek) */
45

    
46
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
47
    int prefix_count;
48
    uint32_t pal[256];
49
    int has_pal;
50
} AVIStream;
51

    
52
typedef struct {
53
    int64_t  riff_end;
54
    int64_t  movi_end;
55
    int64_t  fsize;
56
    int64_t movi_list;
57
    int64_t last_pkt_pos;
58
    int index_loaded;
59
    int is_odml;
60
    int non_interleaved;
61
    int stream_index;
62
    DVDemuxContext* dv_demux;
63
} AVIContext;
64

    
65
static const char avi_headers[][8] = {
66
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
67
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
68
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
69
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
70
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
71
    { 0 }
72
};
73

    
74
static int avi_load_index(AVFormatContext *s);
75
static int guess_ni_flag(AVFormatContext *s);
76

    
77
#ifdef DEBUG
78
static void print_tag(const char *str, unsigned int tag, int size)
79
{
80
    printf("%s: tag=%c%c%c%c size=0x%x\n",
81
           str, tag & 0xff,
82
           (tag >> 8) & 0xff,
83
           (tag >> 16) & 0xff,
84
           (tag >> 24) & 0xff,
85
           size);
86
}
87
#endif
88

    
89
static int get_riff(AVIContext *avi, ByteIOContext *pb)
90
{
91
    char header[8];
92
    int i;
93

    
94
    /* check RIFF header */
95
    get_buffer(pb, header, 4);
96
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
97
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
98
    get_buffer(pb, header+4, 4);
99

    
100
    for(i=0; avi_headers[i][0]; i++)
101
        if(!memcmp(header, avi_headers[i], 8))
102
            break;
103
    if(!avi_headers[i][0])
104
        return -1;
105

    
106
    if(header[7] == 0x19)
107
        av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
108

    
109
    return 0;
110
}
111

    
112
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
113
    AVIContext *avi = s->priv_data;
114
    ByteIOContext *pb = s->pb;
115
    int longs_pre_entry= get_le16(pb);
116
    int index_sub_type = get_byte(pb);
117
    int index_type     = get_byte(pb);
118
    int entries_in_use = get_le32(pb);
119
    int chunk_id       = get_le32(pb);
120
    int64_t base       = get_le64(pb);
121
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
122
    AVStream *st;
123
    AVIStream *ast;
124
    int i;
125
    int64_t last_pos= -1;
126
    int64_t filesize= url_fsize(s->pb);
127

    
128
#ifdef DEBUG_SEEK
129
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
130
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
131
#endif
132

    
133
    if(stream_id > s->nb_streams || stream_id < 0)
134
        return -1;
135
    st= s->streams[stream_id];
136
    ast = st->priv_data;
137

    
138
    if(index_sub_type)
139
        return -1;
140

    
141
    get_le32(pb);
142

    
143
    if(index_type && longs_pre_entry != 2)
144
        return -1;
145
    if(index_type>1)
146
        return -1;
147

    
148
    if(filesize > 0 && base >= filesize){
149
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
150
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
151
            base &= 0xFFFFFFFF;
152
        else
153
            return -1;
154
    }
155

    
156
    for(i=0; i<entries_in_use; i++){
157
        if(index_type){
158
            int64_t pos= get_le32(pb) + base - 8;
159
            int len    = get_le32(pb);
160
            int key= len >= 0;
161
            len &= 0x7FFFFFFF;
162

    
163
#ifdef DEBUG_SEEK
164
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
165
#endif
166
            if(last_pos == pos || pos == base - 8)
167
                avi->non_interleaved= 1;
168
            if(last_pos != pos)
169
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
170

    
171
            if(ast->sample_size)
172
                ast->cum_len += len;
173
            else
174
                ast->cum_len ++;
175
            last_pos= pos;
176
        }else{
177
            int64_t offset, pos;
178
            int duration;
179
            offset = get_le64(pb);
180
            get_le32(pb);       /* size */
181
            duration = get_le32(pb);
182
            pos = url_ftell(pb);
183

    
184
            url_fseek(pb, offset+8, SEEK_SET);
185
            read_braindead_odml_indx(s, frame_num);
186
            frame_num += duration;
187

    
188
            url_fseek(pb, pos, SEEK_SET);
189
        }
190
    }
191
    avi->index_loaded=1;
192
    return 0;
193
}
194

    
195
static void clean_index(AVFormatContext *s){
196
    int i;
197
    int64_t j;
198

    
199
    for(i=0; i<s->nb_streams; i++){
200
        AVStream *st = s->streams[i];
201
        AVIStream *ast = st->priv_data;
202
        int n= st->nb_index_entries;
203
        int max= ast->sample_size;
204
        int64_t pos, size, ts;
205

    
206
        if(n != 1 || ast->sample_size==0)
207
            continue;
208

    
209
        while(max < 1024) max+=max;
210

    
211
        pos= st->index_entries[0].pos;
212
        size= st->index_entries[0].size;
213
        ts= st->index_entries[0].timestamp;
214

    
215
        for(j=0; j<size; j+=max){
216
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
217
        }
218
    }
219
}
220

    
221
static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
222
{
223
    ByteIOContext *pb = s->pb;
224
    uint8_t value[1024];
225

    
226
    int64_t i = url_ftell(pb);
227
    size += (size & 1);
228
    get_strz(pb, value, sizeof(value));
229
    url_fseek(pb, i+size, SEEK_SET);
230

    
231
    return av_metadata_set(&s->metadata, (const AVMetadataTag){key, value});
232
}
233

    
234
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
235
{
236
    AVIContext *avi = s->priv_data;
237
    ByteIOContext *pb = s->pb;
238
    uint32_t tag, tag1, handler;
239
    int codec_type, stream_index, frame_period, bit_rate;
240
    unsigned int size, nb_frames;
241
    int i;
242
    AVStream *st;
243
    AVIStream *ast = NULL;
244
    int avih_width=0, avih_height=0;
245
    int amv_file_format=0;
246

    
247
    avi->stream_index= -1;
248

    
249
    if (get_riff(avi, pb) < 0)
250
        return -1;
251

    
252
    avi->fsize = url_fsize(pb);
253
    if(avi->fsize<=0)
254
        avi->fsize= avi->riff_end;
255

    
256
    /* first list tag */
257
    stream_index = -1;
258
    codec_type = -1;
259
    frame_period = 0;
260
    for(;;) {
261
        if (url_feof(pb))
262
            goto fail;
263
        tag = get_le32(pb);
264
        size = get_le32(pb);
265
#ifdef DEBUG
266
        print_tag("tag", tag, size);
267
#endif
268

    
269
        switch(tag) {
270
        case MKTAG('L', 'I', 'S', 'T'):
271
            /* Ignored, except at start of video packets. */
272
            tag1 = get_le32(pb);
273
#ifdef DEBUG
274
            print_tag("list", tag1, 0);
275
#endif
276
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
277
                avi->movi_list = url_ftell(pb) - 4;
278
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
279
                else     avi->movi_end = url_fsize(pb);
280
#ifdef DEBUG
281
                printf("movi end=%"PRIx64"\n", avi->movi_end);
282
#endif
283
                goto end_of_header;
284
            }
285
            break;
286
        case MKTAG('d', 'm', 'l', 'h'):
287
            avi->is_odml = 1;
288
            url_fskip(pb, size + (size & 1));
289
            break;
290
        case MKTAG('a', 'm', 'v', 'h'):
291
            amv_file_format=1;
292
        case MKTAG('a', 'v', 'i', 'h'):
293
            /* AVI header */
294
            /* using frame_period is bad idea */
295
            frame_period = get_le32(pb);
296
            bit_rate = get_le32(pb) * 8;
297
            get_le32(pb);
298
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
299

    
300
            url_fskip(pb, 2 * 4);
301
            get_le32(pb);
302
            get_le32(pb);
303
            avih_width=get_le32(pb);
304
            avih_height=get_le32(pb);
305

    
306
            url_fskip(pb, size - 10 * 4);
307
            break;
308
        case MKTAG('s', 't', 'r', 'h'):
309
            /* stream header */
310

    
311
            tag1 = get_le32(pb);
312
            handler = get_le32(pb); /* codec tag */
313

    
314
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
315
                url_fskip(pb, size - 8);
316
                break;
317
            }else{
318
                stream_index++;
319
                st = av_new_stream(s, stream_index);
320
                if (!st)
321
                    goto fail;
322

    
323
                ast = av_mallocz(sizeof(AVIStream));
324
                if (!ast)
325
                    goto fail;
326
                st->priv_data = ast;
327
            }
328
            if(amv_file_format)
329
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
330

    
331
#ifdef DEBUG
332
            print_tag("strh", tag1, -1);
333
#endif
334
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
335
                int64_t dv_dur;
336

    
337
                /*
338
                 * After some consideration -- I don't think we
339
                 * have to support anything but DV in type1 AVIs.
340
                 */
341
                if (s->nb_streams != 1)
342
                    goto fail;
343

    
344
                if (handler != MKTAG('d', 'v', 's', 'd') &&
345
                    handler != MKTAG('d', 'v', 'h', 'd') &&
346
                    handler != MKTAG('d', 'v', 's', 'l'))
347
                   goto fail;
348

    
349
                ast = s->streams[0]->priv_data;
350
                av_freep(&s->streams[0]->codec->extradata);
351
                av_freep(&s->streams[0]);
352
                s->nb_streams = 0;
353
                if (CONFIG_DV_DEMUXER) {
354
                    avi->dv_demux = dv_init_demux(s);
355
                    if (!avi->dv_demux)
356
                        goto fail;
357
                }
358
                s->streams[0]->priv_data = ast;
359
                url_fskip(pb, 3 * 4);
360
                ast->scale = get_le32(pb);
361
                ast->rate = get_le32(pb);
362
                url_fskip(pb, 4);  /* start time */
363

    
364
                dv_dur = get_le32(pb);
365
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
366
                    dv_dur *= AV_TIME_BASE;
367
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
368
                }
369
                /*
370
                 * else, leave duration alone; timing estimation in utils.c
371
                 *      will make a guess based on bitrate.
372
                 */
373

    
374
                stream_index = s->nb_streams - 1;
375
                url_fskip(pb, size - 9*4);
376
                break;
377
            }
378

    
379
            assert(stream_index < s->nb_streams);
380
            st->codec->stream_codec_tag= handler;
381

    
382
            get_le32(pb); /* flags */
383
            get_le16(pb); /* priority */
384
            get_le16(pb); /* language */
385
            get_le32(pb); /* initial frame */
386
            ast->scale = get_le32(pb);
387
            ast->rate = get_le32(pb);
388
            if(!(ast->scale && ast->rate)){
389
                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);
390
                if(frame_period){
391
                    ast->rate = 1000000;
392
                    ast->scale = frame_period;
393
                }else{
394
                    ast->rate = 25;
395
                    ast->scale = 1;
396
                }
397
            }
398
            av_set_pts_info(st, 64, ast->scale, ast->rate);
399

    
400
            ast->cum_len=get_le32(pb); /* start */
401
            nb_frames = get_le32(pb);
402

    
403
            st->start_time = 0;
404
            st->duration = nb_frames;
405
            get_le32(pb); /* buffer size */
406
            get_le32(pb); /* quality */
407
            ast->sample_size = get_le32(pb); /* sample ssize */
408
            ast->cum_len *= FFMAX(1, ast->sample_size);
409
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
410

    
411
            switch(tag1) {
412
            case MKTAG('v', 'i', 'd', 's'):
413
                codec_type = CODEC_TYPE_VIDEO;
414

    
415
                ast->sample_size = 0;
416
                break;
417
            case MKTAG('a', 'u', 'd', 's'):
418
                codec_type = CODEC_TYPE_AUDIO;
419
                break;
420
            case MKTAG('t', 'x', 't', 's'):
421
                //FIXME
422
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
423
                break;
424
            case MKTAG('d', 'a', 't', 's'):
425
                codec_type = CODEC_TYPE_DATA;
426
                break;
427
            default:
428
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
429
                goto fail;
430
            }
431
            ast->frame_offset= ast->cum_len;
432
            url_fskip(pb, size - 12 * 4);
433
            break;
434
        case MKTAG('s', 't', 'r', 'f'):
435
            /* stream header */
436
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
437
                url_fskip(pb, size);
438
            } else {
439
                st = s->streams[stream_index];
440
                switch(codec_type) {
441
                case CODEC_TYPE_VIDEO:
442
                    if(amv_file_format){
443
                        st->codec->width=avih_width;
444
                        st->codec->height=avih_height;
445
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
446
                        st->codec->codec_id = CODEC_ID_AMV;
447
                        url_fskip(pb, size);
448
                        break;
449
                    }
450
                    get_le32(pb); /* size */
451
                    st->codec->width = get_le32(pb);
452
                    st->codec->height = get_le32(pb);
453
                    get_le16(pb); /* panes */
454
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
455
                    tag1 = get_le32(pb);
456
                    get_le32(pb); /* ImageSize */
457
                    get_le32(pb); /* XPelsPerMeter */
458
                    get_le32(pb); /* YPelsPerMeter */
459
                    get_le32(pb); /* ClrUsed */
460
                    get_le32(pb); /* ClrImportant */
461

    
462
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
463
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
464
                        st->codec->codec_tag = tag1;
465
                        st->codec->codec_id = CODEC_ID_XSUB;
466
                        break;
467
                    }
468

    
469
                    if(size > 10*4 && size<(1<<30)){
470
                        st->codec->extradata_size= size - 10*4;
471
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
472
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
473
                    }
474

    
475
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
476
                        get_byte(pb);
477

    
478
                    /* Extract palette from extradata if bpp <= 8. */
479
                    /* This code assumes that extradata contains only palette. */
480
                    /* This is true for all paletted codecs implemented in FFmpeg. */
481
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
482
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
483
#ifdef WORDS_BIGENDIAN
484
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
485
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
486
#else
487
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
488
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
489
#endif
490
                        st->codec->palctrl->palette_changed = 1;
491
                    }
492

    
493
#ifdef DEBUG
494
                    print_tag("video", tag1, 0);
495
#endif
496
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
497
                    st->codec->codec_tag = tag1;
498
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
499
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
500
//                    url_fskip(pb, size - 5 * 4);
501
                    break;
502
                case CODEC_TYPE_AUDIO:
503
                    get_wav_header(pb, st->codec, size);
504
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
505
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
506
                        ast->sample_size= st->codec->block_align;
507
                    }
508
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
509
                        url_fskip(pb, 1);
510
                    /* Force parsing as several audio frames can be in
511
                     * one packet and timestamps refer to packet start. */
512
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
513
                    /* ADTS header is in extradata, AAC without header must be
514
                     * stored as exact frames. Parser not needed and it will
515
                     * fail. */
516
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
517
                        st->need_parsing = AVSTREAM_PARSE_NONE;
518
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
519
                     * audio in the header but have Axan as stream_code_tag. */
520
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
521
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
522
                        st->codec->codec_tag = 0;
523
                    }
524
                    if (amv_file_format)
525
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
526
                    break;
527
                default:
528
                    st->codec->codec_type = CODEC_TYPE_DATA;
529
                    st->codec->codec_id= CODEC_ID_NONE;
530
                    st->codec->codec_tag= 0;
531
                    url_fskip(pb, size);
532
                    break;
533
                }
534
            }
535
            break;
536
        case MKTAG('i', 'n', 'd', 'x'):
537
            i= url_ftell(pb);
538
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
539
                read_braindead_odml_indx(s, 0);
540
            }
541
            url_fseek(pb, i+size, SEEK_SET);
542
            break;
543
        case MKTAG('v', 'p', 'r', 'p'):
544
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
545
                AVRational active, active_aspect;
546

    
547
                st = s->streams[stream_index];
548
                get_le32(pb);
549
                get_le32(pb);
550
                get_le32(pb);
551
                get_le32(pb);
552
                get_le32(pb);
553

    
554
                active_aspect.den= get_le16(pb);
555
                active_aspect.num= get_le16(pb);
556
                active.num       = get_le32(pb);
557
                active.den       = get_le32(pb);
558
                get_le32(pb); //nbFieldsPerFrame
559

    
560
                if(active_aspect.num && active_aspect.den && active.num && active.den){
561
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
562
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
563
                }
564
                size -= 9*4;
565
            }
566
            url_fseek(pb, size, SEEK_CUR);
567
            break;
568
        case MKTAG('I', 'N', 'A', 'M'):
569
            avi_read_tag(s, "Title", size);
570
            break;
571
        case MKTAG('I', 'A', 'R', 'T'):
572
            avi_read_tag(s, "Artist", size);
573
            break;
574
        case MKTAG('I', 'C', 'O', 'P'):
575
            avi_read_tag(s, "Copyright", size);
576
            break;
577
        case MKTAG('I', 'C', 'M', 'T'):
578
            avi_read_tag(s, "Comment", size);
579
            break;
580
        case MKTAG('I', 'G', 'N', 'R'):
581
            avi_read_tag(s, "Genre", size);
582
            break;
583
        case MKTAG('I', 'P', 'R', 'D'):
584
            avi_read_tag(s, "Album", size);
585
            break;
586
        case MKTAG('I', 'P', 'R', 'T'):
587
            avi_read_tag(s, "Track", size);
588
            break;
589
        default:
590
            if(size > 1000000){
591
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
592
                                        "I will ignore it and try to continue anyway.\n");
593
                avi->movi_list = url_ftell(pb) - 4;
594
                avi->movi_end  = url_fsize(pb);
595
                goto end_of_header;
596
            }
597
            /* skip tag */
598
            size += (size & 1);
599
            url_fskip(pb, size);
600
            break;
601
        }
602
    }
603
 end_of_header:
604
    /* check stream number */
605
    if (stream_index != s->nb_streams - 1) {
606
    fail:
607
        return -1;
608
    }
609

    
610
    if(!avi->index_loaded && !url_is_streamed(pb))
611
        avi_load_index(s);
612
    avi->index_loaded = 1;
613
    avi->non_interleaved |= guess_ni_flag(s);
614
    if(avi->non_interleaved) {
615
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
616
        clean_index(s);
617
    }
618

    
619
    return 0;
620
}
621

    
622
static int get_stream_idx(int *d){
623
    if(    d[0] >= '0' && d[0] <= '9'
624
        && d[1] >= '0' && d[1] <= '9'){
625
        return (d[0] - '0') * 10 + (d[1] - '0');
626
    }else{
627
        return 100; //invalid stream ID
628
    }
629
}
630

    
631
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
632
{
633
    AVIContext *avi = s->priv_data;
634
    ByteIOContext *pb = s->pb;
635
    int n, d[8], size;
636
    int64_t i, sync;
637
    void* dstr;
638

    
639
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
640
        size = dv_get_packet(avi->dv_demux, pkt);
641
        if (size >= 0)
642
            return size;
643
    }
644

    
645
    if(avi->non_interleaved){
646
        int best_stream_index = 0;
647
        AVStream *best_st= NULL;
648
        AVIStream *best_ast;
649
        int64_t best_ts= INT64_MAX;
650
        int i;
651

    
652
        for(i=0; i<s->nb_streams; i++){
653
            AVStream *st = s->streams[i];
654
            AVIStream *ast = st->priv_data;
655
            int64_t ts= ast->frame_offset;
656

    
657
            if(ast->sample_size)
658
                ts /= ast->sample_size;
659
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
660

    
661
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
662
            if(ts < best_ts && st->nb_index_entries){
663
                best_ts= ts;
664
                best_st= st;
665
                best_stream_index= i;
666
            }
667
        }
668
        if(!best_st)
669
            return -1;
670

    
671
        best_ast = best_st->priv_data;
672
        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
673
        if(best_ast->remaining)
674
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
675
        else{
676
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
677
            if(i>=0)
678
                best_ast->frame_offset= best_st->index_entries[i].timestamp
679
                                      * FFMAX(1, best_ast->sample_size);
680
        }
681

    
682
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
683
        if(i>=0){
684
            int64_t pos= best_st->index_entries[i].pos;
685
            pos += best_ast->packet_size - best_ast->remaining;
686
            url_fseek(s->pb, pos + 8, SEEK_SET);
687
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
688

    
689
            assert(best_ast->remaining <= best_ast->packet_size);
690

    
691
            avi->stream_index= best_stream_index;
692
            if(!best_ast->remaining)
693
                best_ast->packet_size=
694
                best_ast->remaining= best_st->index_entries[i].size;
695
        }
696
    }
697

    
698
resync:
699
    if(avi->stream_index >= 0){
700
        AVStream *st= s->streams[ avi->stream_index ];
701
        AVIStream *ast= st->priv_data;
702
        int size;
703

    
704
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
705
            size= INT_MAX;
706
        else if(ast->sample_size < 32)
707
            size= 64*ast->sample_size;
708
        else
709
            size= ast->sample_size;
710

    
711
        if(size > ast->remaining)
712
            size= ast->remaining;
713
        avi->last_pkt_pos= url_ftell(pb);
714
        av_get_packet(pb, pkt, size);
715

    
716
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
717
            ast->has_pal=0;
718
            pkt->size += 4*256;
719
            pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
720
            if(pkt->data)
721
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
722
        }
723

    
724
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
725
            dstr = pkt->destruct;
726
            size = dv_produce_packet(avi->dv_demux, pkt,
727
                                    pkt->data, pkt->size);
728
            pkt->destruct = dstr;
729
            pkt->flags |= PKT_FLAG_KEY;
730
        } else {
731
            /* XXX: How to handle B-frames in AVI? */
732
            pkt->dts = ast->frame_offset;
733
//                pkt->dts += ast->start;
734
            if(ast->sample_size)
735
                pkt->dts /= ast->sample_size;
736
//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);
737
            pkt->stream_index = avi->stream_index;
738

    
739
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
740
                AVIndexEntry *e;
741
                int index;
742
                assert(st->index_entries);
743

    
744
                index= av_index_search_timestamp(st, pkt->dts, 0);
745
                e= &st->index_entries[index];
746

    
747
                if(index >= 0 && e->timestamp == ast->frame_offset){
748
                    if (e->flags & AVINDEX_KEYFRAME)
749
                        pkt->flags |= PKT_FLAG_KEY;
750
                }
751
            } else {
752
                pkt->flags |= PKT_FLAG_KEY;
753
            }
754
            if(ast->sample_size)
755
                ast->frame_offset += pkt->size;
756
            else
757
                ast->frame_offset++;
758
        }
759
        ast->remaining -= size;
760
        if(!ast->remaining){
761
            avi->stream_index= -1;
762
            ast->packet_size= 0;
763
        }
764

    
765
        return size;
766
    }
767

    
768
    memset(d, -1, sizeof(int)*8);
769
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
770
        int j;
771

    
772
        for(j=0; j<7; j++)
773
            d[j]= d[j+1];
774
        d[7]= get_byte(pb);
775

    
776
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
777

    
778
        n= get_stream_idx(d+2);
779
//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);
780
        if(i + size > avi->fsize || d[0]<0)
781
            continue;
782

    
783
        //parse ix##
784
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
785
        //parse JUNK
786
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
787
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
788
            url_fskip(pb, size);
789
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
790
            goto resync;
791
        }
792

    
793
        n= get_stream_idx(d);
794

    
795
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
796
            continue;
797

    
798
        //parse ##dc/##wb
799
        if(n < s->nb_streams){
800
            AVStream *st;
801
            AVIStream *ast;
802
            st = s->streams[n];
803
            ast = st->priv_data;
804

    
805
            if(s->nb_streams>=2){
806
                AVStream *st1  = s->streams[1];
807
                AVIStream *ast1= st1->priv_data;
808
                //workaround for broken small-file-bug402.avi
809
                if(   d[2] == 'w' && d[3] == 'b'
810
                   && n==0
811
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
812
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
813
                   && ast->prefix == 'd'*256+'c'
814
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
815
                  ){
816
                    n=1;
817
                    st = st1;
818
                    ast = ast1;
819
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
820
                }
821
            }
822

    
823

    
824
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
825
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
826
               || st->discard >= AVDISCARD_ALL){
827
                if(ast->sample_size) ast->frame_offset += pkt->size;
828
                else                 ast->frame_offset++;
829
                url_fskip(pb, size);
830
                goto resync;
831
            }
832

    
833
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
834
                int k = get_byte(pb);
835
                int last = (k + get_byte(pb) - 1) & 0xFF;
836

    
837
                get_le16(pb); //flags
838

    
839
                for (; k <= last; k++)
840
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
841
                ast->has_pal= 1;
842
                goto resync;
843
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
844
                         d[2]*256+d[3] == ast->prefix /*||
845
                         (d[2] == 'd' && d[3] == 'c') ||
846
                         (d[2] == 'w' && d[3] == 'b')*/) {
847

    
848
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
849
                if(d[2]*256+d[3] == ast->prefix)
850
                    ast->prefix_count++;
851
                else{
852
                    ast->prefix= d[2]*256+d[3];
853
                    ast->prefix_count= 0;
854
                }
855

    
856
                avi->stream_index= n;
857
                ast->packet_size= size + 8;
858
                ast->remaining= size;
859

    
860
                {
861
                    uint64_t pos= url_ftell(pb) - 8;
862
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
863
                        av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
864
                    }
865
                }
866
                goto resync;
867
            }
868
        }
869
    }
870

    
871
    return -1;
872
}
873

    
874
/* XXX: We make the implicit supposition that the positions are sorted
875
   for each stream. */
876
static int avi_read_idx1(AVFormatContext *s, int size)
877
{
878
    AVIContext *avi = s->priv_data;
879
    ByteIOContext *pb = s->pb;
880
    int nb_index_entries, i;
881
    AVStream *st;
882
    AVIStream *ast;
883
    unsigned int index, tag, flags, pos, len;
884
    unsigned last_pos= -1;
885

    
886
    nb_index_entries = size / 16;
887
    if (nb_index_entries <= 0)
888
        return -1;
889

    
890
    /* Read the entries and sort them in each stream component. */
891
    for(i = 0; i < nb_index_entries; i++) {
892
        tag = get_le32(pb);
893
        flags = get_le32(pb);
894
        pos = get_le32(pb);
895
        len = get_le32(pb);
896
#if defined(DEBUG_SEEK)
897
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
898
               i, tag, flags, pos, len);
899
#endif
900
        if(i==0 && pos > avi->movi_list)
901
            avi->movi_list= 0; //FIXME better check
902
        pos += avi->movi_list;
903

    
904
        index = ((tag & 0xff) - '0') * 10;
905
        index += ((tag >> 8) & 0xff) - '0';
906
        if (index >= s->nb_streams)
907
            continue;
908
        st = s->streams[index];
909
        ast = st->priv_data;
910

    
911
#if defined(DEBUG_SEEK)
912
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
913
#endif
914
        if(last_pos == pos)
915
            avi->non_interleaved= 1;
916
        else
917
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
918
        if(ast->sample_size)
919
            ast->cum_len += len;
920
        else
921
            ast->cum_len ++;
922
        last_pos= pos;
923
    }
924
    return 0;
925
}
926

    
927
static int guess_ni_flag(AVFormatContext *s){
928
    int i;
929
    int64_t last_start=0;
930
    int64_t first_end= INT64_MAX;
931

    
932
    for(i=0; i<s->nb_streams; i++){
933
        AVStream *st = s->streams[i];
934
        int n= st->nb_index_entries;
935

    
936
        if(n <= 0)
937
            continue;
938

    
939
        if(st->index_entries[0].pos > last_start)
940
            last_start= st->index_entries[0].pos;
941
        if(st->index_entries[n-1].pos < first_end)
942
            first_end= st->index_entries[n-1].pos;
943
    }
944
    return last_start > first_end;
945
}
946

    
947
static int avi_load_index(AVFormatContext *s)
948
{
949
    AVIContext *avi = s->priv_data;
950
    ByteIOContext *pb = s->pb;
951
    uint32_t tag, size;
952
    int64_t pos= url_ftell(pb);
953

    
954
    url_fseek(pb, avi->movi_end, SEEK_SET);
955
#ifdef DEBUG_SEEK
956
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
957
#endif
958
    for(;;) {
959
        if (url_feof(pb))
960
            break;
961
        tag = get_le32(pb);
962
        size = get_le32(pb);
963
#ifdef DEBUG_SEEK
964
        printf("tag=%c%c%c%c size=0x%x\n",
965
               tag & 0xff,
966
               (tag >> 8) & 0xff,
967
               (tag >> 16) & 0xff,
968
               (tag >> 24) & 0xff,
969
               size);
970
#endif
971
        switch(tag) {
972
        case MKTAG('i', 'd', 'x', '1'):
973
            if (avi_read_idx1(s, size) < 0)
974
                goto skip;
975
            else
976
                goto the_end;
977
            break;
978
        default:
979
        skip:
980
            size += (size & 1);
981
            url_fskip(pb, size);
982
            break;
983
        }
984
    }
985
 the_end:
986
    url_fseek(pb, pos, SEEK_SET);
987
    return 0;
988
}
989

    
990
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
991
{
992
    AVIContext *avi = s->priv_data;
993
    AVStream *st;
994
    int i, index;
995
    int64_t pos;
996

    
997
    if (!avi->index_loaded) {
998
        /* we only load the index on demand */
999
        avi_load_index(s);
1000
        avi->index_loaded = 1;
1001
    }
1002
    assert(stream_index>= 0);
1003

    
1004
    st = s->streams[stream_index];
1005
    index= av_index_search_timestamp(st, timestamp, flags);
1006
    if(index<0)
1007
        return -1;
1008

    
1009
    /* find the position */
1010
    pos = st->index_entries[index].pos;
1011
    timestamp = st->index_entries[index].timestamp;
1012

    
1013
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1014

    
1015
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1016
        /* One and only one real stream for DV in AVI, and it has video  */
1017
        /* offsets. Calling with other stream indexes should have failed */
1018
        /* the av_index_search_timestamp call above.                     */
1019
        assert(stream_index == 0);
1020

    
1021
        /* Feed the DV video stream version of the timestamp to the */
1022
        /* DV demux so it can synthesize correct timestamps.        */
1023
        dv_offset_reset(avi->dv_demux, timestamp);
1024

    
1025
        url_fseek(s->pb, pos, SEEK_SET);
1026
        avi->stream_index= -1;
1027
        return 0;
1028
    }
1029

    
1030
    for(i = 0; i < s->nb_streams; i++) {
1031
        AVStream *st2 = s->streams[i];
1032
        AVIStream *ast2 = st2->priv_data;
1033

    
1034
        ast2->packet_size=
1035
        ast2->remaining= 0;
1036

    
1037
        if (st2->nb_index_entries <= 0)
1038
            continue;
1039

    
1040
//        assert(st2->codec->block_align);
1041
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1042
        index = av_index_search_timestamp(
1043
                st2,
1044
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1045
                flags | AVSEEK_FLAG_BACKWARD);
1046
        if(index<0)
1047
            index=0;
1048

    
1049
        if(!avi->non_interleaved){
1050
            while(index>0 && st2->index_entries[index].pos > pos)
1051
                index--;
1052
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1053
                index++;
1054
        }
1055

    
1056
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1057
        /* extract the current frame number */
1058
        ast2->frame_offset = st2->index_entries[index].timestamp;
1059
        if(ast2->sample_size)
1060
            ast2->frame_offset *=ast2->sample_size;
1061
    }
1062

    
1063
    /* do the seek */
1064
    url_fseek(s->pb, pos, SEEK_SET);
1065
    avi->stream_index= -1;
1066
    return 0;
1067
}
1068

    
1069
static int avi_read_close(AVFormatContext *s)
1070
{
1071
    int i;
1072
    AVIContext *avi = s->priv_data;
1073

    
1074
    for(i=0;i<s->nb_streams;i++) {
1075
        AVStream *st = s->streams[i];
1076
        av_free(st->codec->palctrl);
1077
    }
1078

    
1079
    if (avi->dv_demux)
1080
        av_free(avi->dv_demux);
1081

    
1082
    return 0;
1083
}
1084

    
1085
static int avi_probe(AVProbeData *p)
1086
{
1087
    int i;
1088

    
1089
    /* check file header */
1090
    for(i=0; avi_headers[i][0]; i++)
1091
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1092
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1093
            return AVPROBE_SCORE_MAX;
1094

    
1095
    return 0;
1096
}
1097

    
1098
AVInputFormat avi_demuxer = {
1099
    "avi",
1100
    NULL_IF_CONFIG_SMALL("AVI format"),
1101
    sizeof(AVIContext),
1102
    avi_probe,
1103
    avi_read_header,
1104
    avi_read_packet,
1105
    avi_read_close,
1106
    avi_read_seek,
1107
};