Statistics
| Branch: | Revision:

ffmpeg / libavformat / avidec.c @ b60de406

History | View | Annotate | Download (38.3 KB)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
111
    return 0;
112
}
113

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

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

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

    
140
    if(index_sub_type)
141
        return -1;
142

    
143
    get_le32(pb);
144

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

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

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

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

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

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

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

    
191
            pos = url_ftell(pb);
192

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

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

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

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

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

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

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

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

    
230
static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
231
{
232
    ByteIOContext *pb = s->pb;
233
    uint8_t value[1024];
234

    
235
    int64_t i = url_ftell(pb);
236
    size += (size & 1);
237
    get_strz(pb, value, sizeof(value));
238
    url_fseek(pb, i+size, SEEK_SET);
239

    
240
    return av_metadata_set(&s->metadata, key, value);
241
}
242

    
243
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
244
{
245
    AVIContext *avi = s->priv_data;
246
    ByteIOContext *pb = s->pb;
247
    unsigned int tag, tag1, handler;
248
    int codec_type, stream_index, frame_period, bit_rate;
249
    unsigned int size, nb_frames;
250
    int i;
251
    AVStream *st;
252
    AVIStream *ast = NULL;
253
    int avih_width=0, avih_height=0;
254
    int amv_file_format=0;
255
    uint64_t list_end = 0;
256

    
257
    avi->stream_index= -1;
258

    
259
    if (get_riff(s, pb) < 0)
260
        return -1;
261

    
262
    avi->fsize = url_fsize(pb);
263
    if(avi->fsize<=0)
264
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
265

    
266
    /* first list tag */
267
    stream_index = -1;
268
    codec_type = -1;
269
    frame_period = 0;
270
    for(;;) {
271
        if (url_feof(pb))
272
            goto fail;
273
        tag = get_le32(pb);
274
        size = get_le32(pb);
275
#ifdef DEBUG
276
        print_tag("tag", tag, size);
277
#endif
278

    
279
        switch(tag) {
280
        case MKTAG('L', 'I', 'S', 'T'):
281
            list_end = url_ftell(pb) + size;
282
            /* Ignored, except at start of video packets. */
283
            tag1 = get_le32(pb);
284
#ifdef DEBUG
285
            print_tag("list", tag1, 0);
286
#endif
287
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
288
                avi->movi_list = url_ftell(pb) - 4;
289
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
290
                else     avi->movi_end = url_fsize(pb);
291
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
292
                goto end_of_header;
293
            }
294
            break;
295
        case MKTAG('d', 'm', 'l', 'h'):
296
            avi->is_odml = 1;
297
            url_fskip(pb, size + (size & 1));
298
            break;
299
        case MKTAG('a', 'm', 'v', 'h'):
300
            amv_file_format=1;
301
        case MKTAG('a', 'v', 'i', 'h'):
302
            /* AVI header */
303
            /* using frame_period is bad idea */
304
            frame_period = get_le32(pb);
305
            bit_rate = get_le32(pb) * 8;
306
            get_le32(pb);
307
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
308

    
309
            url_fskip(pb, 2 * 4);
310
            get_le32(pb);
311
            get_le32(pb);
312
            avih_width=get_le32(pb);
313
            avih_height=get_le32(pb);
314

    
315
            url_fskip(pb, size - 10 * 4);
316
            break;
317
        case MKTAG('s', 't', 'r', 'h'):
318
            /* stream header */
319

    
320
            tag1 = get_le32(pb);
321
            handler = get_le32(pb); /* codec tag */
322

    
323
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
324
                url_fskip(pb, size - 8);
325
                break;
326
            }else{
327
                stream_index++;
328
                st = av_new_stream(s, stream_index);
329
                if (!st)
330
                    goto fail;
331

    
332
                ast = av_mallocz(sizeof(AVIStream));
333
                if (!ast)
334
                    goto fail;
335
                st->priv_data = ast;
336
            }
337
            if(amv_file_format)
338
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
339

    
340
#ifdef DEBUG
341
            print_tag("strh", tag1, -1);
342
#endif
343
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
344
                int64_t dv_dur;
345

    
346
                /*
347
                 * After some consideration -- I don't think we
348
                 * have to support anything but DV in type1 AVIs.
349
                 */
350
                if (s->nb_streams != 1)
351
                    goto fail;
352

    
353
                if (handler != MKTAG('d', 'v', 's', 'd') &&
354
                    handler != MKTAG('d', 'v', 'h', 'd') &&
355
                    handler != MKTAG('d', 'v', 's', 'l'))
356
                   goto fail;
357

    
358
                ast = s->streams[0]->priv_data;
359
                av_freep(&s->streams[0]->codec->extradata);
360
                av_freep(&s->streams[0]);
361
                s->nb_streams = 0;
362
                if (CONFIG_DV_DEMUXER) {
363
                    avi->dv_demux = dv_init_demux(s);
364
                    if (!avi->dv_demux)
365
                        goto fail;
366
                }
367
                s->streams[0]->priv_data = ast;
368
                url_fskip(pb, 3 * 4);
369
                ast->scale = get_le32(pb);
370
                ast->rate = get_le32(pb);
371
                url_fskip(pb, 4);  /* start time */
372

    
373
                dv_dur = get_le32(pb);
374
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
375
                    dv_dur *= AV_TIME_BASE;
376
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
377
                }
378
                /*
379
                 * else, leave duration alone; timing estimation in utils.c
380
                 *      will make a guess based on bitrate.
381
                 */
382

    
383
                stream_index = s->nb_streams - 1;
384
                url_fskip(pb, size - 9*4);
385
                break;
386
            }
387

    
388
            assert(stream_index < s->nb_streams);
389
            st->codec->stream_codec_tag= handler;
390

    
391
            get_le32(pb); /* flags */
392
            get_le16(pb); /* priority */
393
            get_le16(pb); /* language */
394
            get_le32(pb); /* initial frame */
395
            ast->scale = get_le32(pb);
396
            ast->rate = get_le32(pb);
397
            if(!(ast->scale && ast->rate)){
398
                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);
399
                if(frame_period){
400
                    ast->rate = 1000000;
401
                    ast->scale = frame_period;
402
                }else{
403
                    ast->rate = 25;
404
                    ast->scale = 1;
405
                }
406
            }
407
            av_set_pts_info(st, 64, ast->scale, ast->rate);
408

    
409
            ast->cum_len=get_le32(pb); /* start */
410
            nb_frames = get_le32(pb);
411

    
412
            st->start_time = 0;
413
            st->duration = nb_frames;
414
            get_le32(pb); /* buffer size */
415
            get_le32(pb); /* quality */
416
            ast->sample_size = get_le32(pb); /* sample ssize */
417
            ast->cum_len *= FFMAX(1, ast->sample_size);
418
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
419

    
420
            switch(tag1) {
421
            case MKTAG('v', 'i', 'd', 's'):
422
                codec_type = CODEC_TYPE_VIDEO;
423

    
424
                ast->sample_size = 0;
425
                break;
426
            case MKTAG('a', 'u', 'd', 's'):
427
                codec_type = CODEC_TYPE_AUDIO;
428
                break;
429
            case MKTAG('t', 'x', 't', 's'):
430
                //FIXME
431
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
432
                break;
433
            case MKTAG('d', 'a', 't', 's'):
434
                codec_type = CODEC_TYPE_DATA;
435
                break;
436
            default:
437
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
438
                goto fail;
439
            }
440
            ast->frame_offset= ast->cum_len;
441
            url_fskip(pb, size - 12 * 4);
442
            break;
443
        case MKTAG('s', 't', 'r', 'f'):
444
            /* stream header */
445
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
446
                url_fskip(pb, size);
447
            } else {
448
                uint64_t cur_pos = url_ftell(pb);
449
                if (cur_pos < list_end)
450
                    size = FFMIN(size, list_end - cur_pos);
451
                st = s->streams[stream_index];
452
                switch(codec_type) {
453
                case CODEC_TYPE_VIDEO:
454
                    if(amv_file_format){
455
                        st->codec->width=avih_width;
456
                        st->codec->height=avih_height;
457
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
458
                        st->codec->codec_id = CODEC_ID_AMV;
459
                        url_fskip(pb, size);
460
                        break;
461
                    }
462
                    get_le32(pb); /* size */
463
                    st->codec->width = get_le32(pb);
464
                    st->codec->height = (int32_t)get_le32(pb);
465
                    get_le16(pb); /* panes */
466
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
467
                    tag1 = get_le32(pb);
468
                    get_le32(pb); /* ImageSize */
469
                    get_le32(pb); /* XPelsPerMeter */
470
                    get_le32(pb); /* YPelsPerMeter */
471
                    get_le32(pb); /* ClrUsed */
472
                    get_le32(pb); /* ClrImportant */
473

    
474
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
475
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
476
                        st->codec->codec_tag = tag1;
477
                        st->codec->codec_id = CODEC_ID_XSUB;
478
                        break;
479
                    }
480

    
481
                    if(size > 10*4 && size<(1<<30)){
482
                        st->codec->extradata_size= size - 10*4;
483
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
484
                        if (!st->codec->extradata) {
485
                            st->codec->extradata_size= 0;
486
                            return AVERROR(ENOMEM);
487
                        }
488
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
489
                    }
490

    
491
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
492
                        get_byte(pb);
493

    
494
                    /* Extract palette from extradata if bpp <= 8. */
495
                    /* This code assumes that extradata contains only palette. */
496
                    /* This is true for all paletted codecs implemented in FFmpeg. */
497
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
498
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
499
#if HAVE_BIGENDIAN
500
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
501
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
502
#else
503
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
504
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
505
#endif
506
                        st->codec->palctrl->palette_changed = 1;
507
                    }
508

    
509
#ifdef DEBUG
510
                    print_tag("video", tag1, 0);
511
#endif
512
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
513
                    st->codec->codec_tag = tag1;
514
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
515
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
516

    
517
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
518
                        st->codec->extradata_size+= 9;
519
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
520
                        if(st->codec->extradata)
521
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
522
                    }
523
                    st->codec->height= FFABS(st->codec->height);
524

    
525
//                    url_fskip(pb, size - 5 * 4);
526
                    break;
527
                case CODEC_TYPE_AUDIO:
528
                    ff_get_wav_header(pb, st->codec, size);
529
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
530
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
531
                        ast->sample_size= st->codec->block_align;
532
                    }
533
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
534
                        url_fskip(pb, 1);
535
                    /* Force parsing as several audio frames can be in
536
                     * one packet and timestamps refer to packet start. */
537
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
538
                    /* ADTS header is in extradata, AAC without header must be
539
                     * stored as exact frames. Parser not needed and it will
540
                     * fail. */
541
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
542
                        st->need_parsing = AVSTREAM_PARSE_NONE;
543
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
544
                     * audio in the header but have Axan as stream_code_tag. */
545
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
546
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
547
                        st->codec->codec_tag = 0;
548
                    }
549
                    if (amv_file_format)
550
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
551
                    break;
552
                default:
553
                    st->codec->codec_type = CODEC_TYPE_DATA;
554
                    st->codec->codec_id= CODEC_ID_NONE;
555
                    st->codec->codec_tag= 0;
556
                    url_fskip(pb, size);
557
                    break;
558
                }
559
            }
560
            break;
561
        case MKTAG('i', 'n', 'd', 'x'):
562
            i= url_ftell(pb);
563
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
564
                read_braindead_odml_indx(s, 0);
565
            }
566
            url_fseek(pb, i+size, SEEK_SET);
567
            break;
568
        case MKTAG('v', 'p', 'r', 'p'):
569
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
570
                AVRational active, active_aspect;
571

    
572
                st = s->streams[stream_index];
573
                get_le32(pb);
574
                get_le32(pb);
575
                get_le32(pb);
576
                get_le32(pb);
577
                get_le32(pb);
578

    
579
                active_aspect.den= get_le16(pb);
580
                active_aspect.num= get_le16(pb);
581
                active.num       = get_le32(pb);
582
                active.den       = get_le32(pb);
583
                get_le32(pb); //nbFieldsPerFrame
584

    
585
                if(active_aspect.num && active_aspect.den && active.num && active.den){
586
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
587
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
588
                }
589
                size -= 9*4;
590
            }
591
            url_fseek(pb, size, SEEK_CUR);
592
            break;
593
        case MKTAG('I', 'N', 'A', 'M'):
594
            avi_read_tag(s, "Title", size);
595
            break;
596
        case MKTAG('I', 'A', 'R', 'T'):
597
            avi_read_tag(s, "Artist", size);
598
            break;
599
        case MKTAG('I', 'C', 'O', 'P'):
600
            avi_read_tag(s, "Copyright", size);
601
            break;
602
        case MKTAG('I', 'C', 'M', 'T'):
603
            avi_read_tag(s, "Comment", size);
604
            break;
605
        case MKTAG('I', 'G', 'N', 'R'):
606
            avi_read_tag(s, "Genre", size);
607
            break;
608
        case MKTAG('I', 'P', 'R', 'D'):
609
            avi_read_tag(s, "Album", size);
610
            break;
611
        case MKTAG('I', 'P', 'R', 'T'):
612
            avi_read_tag(s, "Track", size);
613
            break;
614
        default:
615
            if(size > 1000000){
616
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
617
                                        "I will ignore it and try to continue anyway.\n");
618
                avi->movi_list = url_ftell(pb) - 4;
619
                avi->movi_end  = url_fsize(pb);
620
                goto end_of_header;
621
            }
622
            /* skip tag */
623
            size += (size & 1);
624
            url_fskip(pb, size);
625
            break;
626
        }
627
    }
628
 end_of_header:
629
    /* check stream number */
630
    if (stream_index != s->nb_streams - 1) {
631
    fail:
632
        return -1;
633
    }
634

    
635
    if(!avi->index_loaded && !url_is_streamed(pb))
636
        avi_load_index(s);
637
    avi->index_loaded = 1;
638
    avi->non_interleaved |= guess_ni_flag(s);
639
    if(avi->non_interleaved) {
640
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
641
        clean_index(s);
642
    }
643

    
644
    return 0;
645
}
646

    
647
static int get_stream_idx(int *d){
648
    if(    d[0] >= '0' && d[0] <= '9'
649
        && d[1] >= '0' && d[1] <= '9'){
650
        return (d[0] - '0') * 10 + (d[1] - '0');
651
    }else{
652
        return 100; //invalid stream ID
653
    }
654
}
655

    
656
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
657
{
658
    AVIContext *avi = s->priv_data;
659
    ByteIOContext *pb = s->pb;
660
    int n, d[8];
661
    unsigned int size;
662
    int64_t i, sync;
663
    void* dstr;
664

    
665
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
666
        int size = dv_get_packet(avi->dv_demux, pkt);
667
        if (size >= 0)
668
            return size;
669
    }
670

    
671
    if(avi->non_interleaved){
672
        int best_stream_index = 0;
673
        AVStream *best_st= NULL;
674
        AVIStream *best_ast;
675
        int64_t best_ts= INT64_MAX;
676
        int i;
677

    
678
        for(i=0; i<s->nb_streams; i++){
679
            AVStream *st = s->streams[i];
680
            AVIStream *ast = st->priv_data;
681
            int64_t ts= ast->frame_offset;
682

    
683
            if(!st->nb_index_entries)
684
                continue;
685

    
686
            if(ast->sample_size)
687
                ts /= ast->sample_size;
688
            ts = av_rescale_q(ts, st->time_base, AV_TIME_BASE_Q);
689

    
690
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
691
            if(ts < best_ts){
692
                best_ts= ts;
693
                best_st= st;
694
                best_stream_index= i;
695
            }
696
        }
697
        if(!best_st)
698
            return -1;
699

    
700
        best_ast = best_st->priv_data;
701
        best_ts = av_rescale_q(best_ts, AV_TIME_BASE_Q, best_st->time_base);
702
        if(best_ast->remaining)
703
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
704
        else{
705
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
706
            if(i>=0)
707
                best_ast->frame_offset= best_st->index_entries[i].timestamp
708
                                      * FFMAX(1, best_ast->sample_size);
709
        }
710

    
711
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
712
        if(i>=0){
713
            int64_t pos= best_st->index_entries[i].pos;
714
            pos += best_ast->packet_size - best_ast->remaining;
715
            url_fseek(s->pb, pos + 8, SEEK_SET);
716
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
717

    
718
            assert(best_ast->remaining <= best_ast->packet_size);
719

    
720
            avi->stream_index= best_stream_index;
721
            if(!best_ast->remaining)
722
                best_ast->packet_size=
723
                best_ast->remaining= best_st->index_entries[i].size;
724
        }
725
    }
726

    
727
resync:
728
    if(avi->stream_index >= 0){
729
        AVStream *st= s->streams[ avi->stream_index ];
730
        AVIStream *ast= st->priv_data;
731
        int size, err;
732

    
733
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
734
            size= INT_MAX;
735
        else if(ast->sample_size < 32)
736
            size= 64*ast->sample_size;
737
        else
738
            size= ast->sample_size;
739

    
740
        if(size > ast->remaining)
741
            size= ast->remaining;
742
        avi->last_pkt_pos= url_ftell(pb);
743
        err= av_get_packet(pb, pkt, size);
744
        if(err<0)
745
            return err;
746

    
747
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
748
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
749
            if(ptr){
750
            ast->has_pal=0;
751
            pkt->size += 4*256;
752
            pkt->data= ptr;
753
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
754
            }else
755
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
756
        }
757

    
758
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
759
            dstr = pkt->destruct;
760
            size = dv_produce_packet(avi->dv_demux, pkt,
761
                                    pkt->data, pkt->size);
762
            pkt->destruct = dstr;
763
            pkt->flags |= PKT_FLAG_KEY;
764
        } else {
765
            /* XXX: How to handle B-frames in AVI? */
766
            pkt->dts = ast->frame_offset;
767
//                pkt->dts += ast->start;
768
            if(ast->sample_size)
769
                pkt->dts /= ast->sample_size;
770
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
771
            pkt->stream_index = avi->stream_index;
772

    
773
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
774
                AVIndexEntry *e;
775
                int index;
776
                assert(st->index_entries);
777

    
778
                index= av_index_search_timestamp(st, pkt->dts, 0);
779
                e= &st->index_entries[index];
780

    
781
                if(index >= 0 && e->timestamp == ast->frame_offset){
782
                    if (e->flags & AVINDEX_KEYFRAME)
783
                        pkt->flags |= PKT_FLAG_KEY;
784
                }
785
            } else {
786
                pkt->flags |= PKT_FLAG_KEY;
787
            }
788
            if(ast->sample_size)
789
                ast->frame_offset += pkt->size;
790
            else
791
                ast->frame_offset++;
792
        }
793
        ast->remaining -= size;
794
        if(!ast->remaining){
795
            avi->stream_index= -1;
796
            ast->packet_size= 0;
797
        }
798

    
799
        return size;
800
    }
801

    
802
    memset(d, -1, sizeof(int)*8);
803
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
804
        int j;
805

    
806
        for(j=0; j<7; j++)
807
            d[j]= d[j+1];
808
        d[7]= get_byte(pb);
809

    
810
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
811

    
812
        n= get_stream_idx(d+2);
813
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
814
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
815
            continue;
816

    
817
        //parse ix##
818
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
819
        //parse JUNK
820
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
821
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
822
            url_fskip(pb, size);
823
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
824
            goto resync;
825
        }
826

    
827
        n= get_stream_idx(d);
828

    
829
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
830
            continue;
831

    
832
        //detect ##ix chunk and skip
833
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
834
            url_fskip(pb, size);
835
            goto resync;
836
        }
837

    
838
        //parse ##dc/##wb
839
        if(n < s->nb_streams){
840
            AVStream *st;
841
            AVIStream *ast;
842
            st = s->streams[n];
843
            ast = st->priv_data;
844

    
845
            if(s->nb_streams>=2){
846
                AVStream *st1  = s->streams[1];
847
                AVIStream *ast1= st1->priv_data;
848
                //workaround for broken small-file-bug402.avi
849
                if(   d[2] == 'w' && d[3] == 'b'
850
                   && n==0
851
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
852
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
853
                   && ast->prefix == 'd'*256+'c'
854
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
855
                  ){
856
                    n=1;
857
                    st = st1;
858
                    ast = ast1;
859
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
860
                }
861
            }
862

    
863

    
864
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
865
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
866
               || st->discard >= AVDISCARD_ALL){
867
                if(ast->sample_size) ast->frame_offset += pkt->size;
868
                else                 ast->frame_offset++;
869
                url_fskip(pb, size);
870
                goto resync;
871
            }
872

    
873
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
874
                int k = get_byte(pb);
875
                int last = (k + get_byte(pb) - 1) & 0xFF;
876

    
877
                get_le16(pb); //flags
878

    
879
                for (; k <= last; k++)
880
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
881
                ast->has_pal= 1;
882
                goto resync;
883
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
884
                         d[2]*256+d[3] == ast->prefix /*||
885
                         (d[2] == 'd' && d[3] == 'c') ||
886
                         (d[2] == 'w' && d[3] == 'b')*/) {
887

    
888
//av_log(s, AV_LOG_DEBUG, "OK\n");
889
                if(d[2]*256+d[3] == ast->prefix)
890
                    ast->prefix_count++;
891
                else{
892
                    ast->prefix= d[2]*256+d[3];
893
                    ast->prefix_count= 0;
894
                }
895

    
896
                avi->stream_index= n;
897
                ast->packet_size= size + 8;
898
                ast->remaining= size;
899

    
900
                {
901
                    uint64_t pos= url_ftell(pb) - 8;
902
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
903
                        av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
904
                    }
905
                }
906
                goto resync;
907
            }
908
        }
909
    }
910

    
911
    return AVERROR_EOF;
912
}
913

    
914
/* XXX: We make the implicit supposition that the positions are sorted
915
   for each stream. */
916
static int avi_read_idx1(AVFormatContext *s, int size)
917
{
918
    AVIContext *avi = s->priv_data;
919
    ByteIOContext *pb = s->pb;
920
    int nb_index_entries, i;
921
    AVStream *st;
922
    AVIStream *ast;
923
    unsigned int index, tag, flags, pos, len;
924
    unsigned last_pos= -1;
925

    
926
    nb_index_entries = size / 16;
927
    if (nb_index_entries <= 0)
928
        return -1;
929

    
930
    /* Read the entries and sort them in each stream component. */
931
    for(i = 0; i < nb_index_entries; i++) {
932
        tag = get_le32(pb);
933
        flags = get_le32(pb);
934
        pos = get_le32(pb);
935
        len = get_le32(pb);
936
#if defined(DEBUG_SEEK)
937
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
938
               i, tag, flags, pos, len);
939
#endif
940
        if(i==0 && pos > avi->movi_list)
941
            avi->movi_list= 0; //FIXME better check
942
        pos += avi->movi_list;
943

    
944
        index = ((tag & 0xff) - '0') * 10;
945
        index += ((tag >> 8) & 0xff) - '0';
946
        if (index >= s->nb_streams)
947
            continue;
948
        st = s->streams[index];
949
        ast = st->priv_data;
950

    
951
#if defined(DEBUG_SEEK)
952
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
953
#endif
954
        if(url_feof(pb))
955
            return -1;
956

    
957
        if(last_pos == pos)
958
            avi->non_interleaved= 1;
959
        else
960
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
961
        if(ast->sample_size)
962
            ast->cum_len += len;
963
        else
964
            ast->cum_len ++;
965
        last_pos= pos;
966
    }
967
    return 0;
968
}
969

    
970
static int guess_ni_flag(AVFormatContext *s){
971
    int i;
972
    int64_t last_start=0;
973
    int64_t first_end= INT64_MAX;
974
    int64_t oldpos= url_ftell(s->pb);
975

    
976
    for(i=0; i<s->nb_streams; i++){
977
        AVStream *st = s->streams[i];
978
        int n= st->nb_index_entries;
979
        unsigned int size;
980

    
981
        if(n <= 0)
982
            continue;
983

    
984
        if(n >= 2){
985
            int64_t pos= st->index_entries[0].pos;
986
            url_fseek(s->pb, pos + 4, SEEK_SET);
987
            size= get_le32(s->pb);
988
            if(pos + size > st->index_entries[1].pos)
989
                last_start= INT64_MAX;
990
        }
991

    
992
        if(st->index_entries[0].pos > last_start)
993
            last_start= st->index_entries[0].pos;
994
        if(st->index_entries[n-1].pos < first_end)
995
            first_end= st->index_entries[n-1].pos;
996
    }
997
    url_fseek(s->pb, oldpos, SEEK_SET);
998
    return last_start > first_end;
999
}
1000

    
1001
static int avi_load_index(AVFormatContext *s)
1002
{
1003
    AVIContext *avi = s->priv_data;
1004
    ByteIOContext *pb = s->pb;
1005
    uint32_t tag, size;
1006
    int64_t pos= url_ftell(pb);
1007
    int ret = -1;
1008

    
1009
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1010
        goto the_end; // maybe truncated file
1011
#ifdef DEBUG_SEEK
1012
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1013
#endif
1014
    for(;;) {
1015
        if (url_feof(pb))
1016
            break;
1017
        tag = get_le32(pb);
1018
        size = get_le32(pb);
1019
#ifdef DEBUG_SEEK
1020
        printf("tag=%c%c%c%c size=0x%x\n",
1021
               tag & 0xff,
1022
               (tag >> 8) & 0xff,
1023
               (tag >> 16) & 0xff,
1024
               (tag >> 24) & 0xff,
1025
               size);
1026
#endif
1027
        switch(tag) {
1028
        case MKTAG('i', 'd', 'x', '1'):
1029
            if (avi_read_idx1(s, size) < 0)
1030
                goto skip;
1031
            ret = 0;
1032
                goto the_end;
1033
            break;
1034
        default:
1035
        skip:
1036
            size += (size & 1);
1037
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1038
                goto the_end; // something is wrong here
1039
            break;
1040
        }
1041
    }
1042
 the_end:
1043
    url_fseek(pb, pos, SEEK_SET);
1044
    return ret;
1045
}
1046

    
1047
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1048
{
1049
    AVIContext *avi = s->priv_data;
1050
    AVStream *st;
1051
    int i, index;
1052
    int64_t pos;
1053

    
1054
    if (!avi->index_loaded) {
1055
        /* we only load the index on demand */
1056
        avi_load_index(s);
1057
        avi->index_loaded = 1;
1058
    }
1059
    assert(stream_index>= 0);
1060

    
1061
    st = s->streams[stream_index];
1062
    index= av_index_search_timestamp(st, timestamp, flags);
1063
    if(index<0)
1064
        return -1;
1065

    
1066
    /* find the position */
1067
    pos = st->index_entries[index].pos;
1068
    timestamp = st->index_entries[index].timestamp;
1069

    
1070
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1071

    
1072
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1073
        /* One and only one real stream for DV in AVI, and it has video  */
1074
        /* offsets. Calling with other stream indexes should have failed */
1075
        /* the av_index_search_timestamp call above.                     */
1076
        assert(stream_index == 0);
1077

    
1078
        /* Feed the DV video stream version of the timestamp to the */
1079
        /* DV demux so it can synthesize correct timestamps.        */
1080
        dv_offset_reset(avi->dv_demux, timestamp);
1081

    
1082
        url_fseek(s->pb, pos, SEEK_SET);
1083
        avi->stream_index= -1;
1084
        return 0;
1085
    }
1086

    
1087
    for(i = 0; i < s->nb_streams; i++) {
1088
        AVStream *st2 = s->streams[i];
1089
        AVIStream *ast2 = st2->priv_data;
1090

    
1091
        ast2->packet_size=
1092
        ast2->remaining= 0;
1093

    
1094
        if (st2->nb_index_entries <= 0)
1095
            continue;
1096

    
1097
//        assert(st2->codec->block_align);
1098
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1099
        index = av_index_search_timestamp(
1100
                st2,
1101
                av_rescale_q(timestamp, st->time_base, st2->time_base),
1102
                flags | AVSEEK_FLAG_BACKWARD);
1103
        if(index<0)
1104
            index=0;
1105

    
1106
        if(!avi->non_interleaved){
1107
            while(index>0 && st2->index_entries[index].pos > pos)
1108
                index--;
1109
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1110
                index++;
1111
        }
1112

    
1113
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1114
        /* extract the current frame number */
1115
        ast2->frame_offset = st2->index_entries[index].timestamp;
1116
        if(ast2->sample_size)
1117
            ast2->frame_offset *=ast2->sample_size;
1118
    }
1119

    
1120
    /* do the seek */
1121
    url_fseek(s->pb, pos, SEEK_SET);
1122
    avi->stream_index= -1;
1123
    return 0;
1124
}
1125

    
1126
static int avi_read_close(AVFormatContext *s)
1127
{
1128
    int i;
1129
    AVIContext *avi = s->priv_data;
1130

    
1131
    for(i=0;i<s->nb_streams;i++) {
1132
        AVStream *st = s->streams[i];
1133
        av_free(st->codec->palctrl);
1134
    }
1135

    
1136
    if (avi->dv_demux)
1137
        av_free(avi->dv_demux);
1138

    
1139
    return 0;
1140
}
1141

    
1142
static int avi_probe(AVProbeData *p)
1143
{
1144
    int i;
1145

    
1146
    /* check file header */
1147
    for(i=0; avi_headers[i][0]; i++)
1148
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1149
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1150
            return AVPROBE_SCORE_MAX;
1151

    
1152
    return 0;
1153
}
1154

    
1155
AVInputFormat avi_demuxer = {
1156
    "avi",
1157
    NULL_IF_CONFIG_SMALL("AVI format"),
1158
    sizeof(AVIContext),
1159
    avi_probe,
1160
    avi_read_header,
1161
    avi_read_packet,
1162
    avi_read_close,
1163
    avi_read_seek,
1164
};