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ffmpeg / libavformat / avidec.c @ 8a472821

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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
//#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
    int odml_depth;
65
#define MAX_ODML_DEPTH 1000
66
} AVIContext;
67

    
68
static const char avi_headers[][8] = {
69
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
70
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
71
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
72
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
73
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
74
    { 0 }
75
};
76

    
77
static int avi_load_index(AVFormatContext *s);
78
static int guess_ni_flag(AVFormatContext *s);
79

    
80
#ifdef DEBUG
81
static void print_tag(const char *str, unsigned int tag, int size)
82
{
83
    dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
84
           str, tag & 0xff,
85
           (tag >> 8) & 0xff,
86
           (tag >> 16) & 0xff,
87
           (tag >> 24) & 0xff,
88
           size);
89
}
90
#endif
91

    
92
static inline int get_duration(AVIStream *ast, int len){
93
    if(ast->sample_size){
94
        return len;
95
    }else
96
        return 1;
97
}
98

    
99
static int get_riff(AVFormatContext *s, ByteIOContext *pb)
100
{
101
    AVIContext *avi = s->priv_data;
102
    char header[8];
103
    int i;
104

    
105
    /* check RIFF header */
106
    get_buffer(pb, header, 4);
107
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
108
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
109
    get_buffer(pb, header+4, 4);
110

    
111
    for(i=0; avi_headers[i][0]; i++)
112
        if(!memcmp(header, avi_headers[i], 8))
113
            break;
114
    if(!avi_headers[i][0])
115
        return -1;
116

    
117
    if(header[7] == 0x19)
118
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
119

    
120
    return 0;
121
}
122

    
123
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
124
    AVIContext *avi = s->priv_data;
125
    ByteIOContext *pb = s->pb;
126
    int longs_pre_entry= get_le16(pb);
127
    int index_sub_type = get_byte(pb);
128
    int index_type     = get_byte(pb);
129
    int entries_in_use = get_le32(pb);
130
    int chunk_id       = get_le32(pb);
131
    int64_t base       = get_le64(pb);
132
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
133
    AVStream *st;
134
    AVIStream *ast;
135
    int i;
136
    int64_t last_pos= -1;
137
    int64_t filesize= url_fsize(s->pb);
138

    
139
#ifdef DEBUG_SEEK
140
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
141
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
142
#endif
143

    
144
    if(stream_id >= s->nb_streams || stream_id < 0)
145
        return -1;
146
    st= s->streams[stream_id];
147
    ast = st->priv_data;
148

    
149
    if(index_sub_type)
150
        return -1;
151

    
152
    get_le32(pb);
153

    
154
    if(index_type && longs_pre_entry != 2)
155
        return -1;
156
    if(index_type>1)
157
        return -1;
158

    
159
    if(filesize > 0 && base >= filesize){
160
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
161
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
162
            base &= 0xFFFFFFFF;
163
        else
164
            return -1;
165
    }
166

    
167
    for(i=0; i<entries_in_use; i++){
168
        if(index_type){
169
            int64_t pos= get_le32(pb) + base - 8;
170
            int len    = get_le32(pb);
171
            int key= len >= 0;
172
            len &= 0x7FFFFFFF;
173

    
174
#ifdef DEBUG_SEEK
175
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
176
#endif
177
            if(url_feof(pb))
178
                return -1;
179

    
180
            if(last_pos == pos || pos == base - 8)
181
                avi->non_interleaved= 1;
182
            if(last_pos != pos && (len || !ast->sample_size))
183
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
184

    
185
            ast->cum_len += get_duration(ast, len);
186
            last_pos= pos;
187
        }else{
188
            int64_t offset, pos;
189
            int duration;
190
            offset = get_le64(pb);
191
            get_le32(pb);       /* size */
192
            duration = get_le32(pb);
193

    
194
            if(url_feof(pb))
195
                return -1;
196

    
197
            pos = url_ftell(pb);
198

    
199
            if(avi->odml_depth > MAX_ODML_DEPTH){
200
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
201
                return -1;
202
            }
203

    
204
            url_fseek(pb, offset+8, SEEK_SET);
205
            avi->odml_depth++;
206
            read_braindead_odml_indx(s, frame_num);
207
            avi->odml_depth--;
208
            frame_num += duration;
209

    
210
            url_fseek(pb, pos, SEEK_SET);
211
        }
212
    }
213
    avi->index_loaded=1;
214
    return 0;
215
}
216

    
217
static void clean_index(AVFormatContext *s){
218
    int i;
219
    int64_t j;
220

    
221
    for(i=0; i<s->nb_streams; i++){
222
        AVStream *st = s->streams[i];
223
        AVIStream *ast = st->priv_data;
224
        int n= st->nb_index_entries;
225
        int max= ast->sample_size;
226
        int64_t pos, size, ts;
227

    
228
        if(n != 1 || ast->sample_size==0)
229
            continue;
230

    
231
        while(max < 1024) max+=max;
232

    
233
        pos= st->index_entries[0].pos;
234
        size= st->index_entries[0].size;
235
        ts= st->index_entries[0].timestamp;
236

    
237
        for(j=0; j<size; j+=max){
238
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
239
        }
240
    }
241
}
242

    
243
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
244
{
245
    ByteIOContext *pb = s->pb;
246
    char key[5] = {0}, *value;
247

    
248
    size += (size & 1);
249

    
250
    if (size == UINT_MAX)
251
        return -1;
252
    value = av_malloc(size+1);
253
    if (!value)
254
        return -1;
255
    get_buffer(pb, value, size);
256
    value[size]=0;
257

    
258
    AV_WL32(key, tag);
259

    
260
    if(st)
261
        return av_metadata_set2(&st->metadata, key, value,
262
                                    AV_METADATA_DONT_STRDUP_VAL);
263
    else
264
    return av_metadata_set2(&s->metadata, key, value,
265
                                  AV_METADATA_DONT_STRDUP_VAL);
266
}
267

    
268
static void avi_read_info(AVFormatContext *s, uint64_t end)
269
{
270
    while (url_ftell(s->pb) < end) {
271
        uint32_t tag  = get_le32(s->pb);
272
        uint32_t size = get_le32(s->pb);
273
        avi_read_tag(s, NULL, tag, size);
274
    }
275
}
276

    
277
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
278
{
279
    AVIContext *avi = s->priv_data;
280
    ByteIOContext *pb = s->pb;
281
    unsigned int tag, tag1, handler;
282
    int codec_type, stream_index, frame_period, bit_rate;
283
    unsigned int size;
284
    int i;
285
    AVStream *st;
286
    AVIStream *ast = NULL;
287
    int avih_width=0, avih_height=0;
288
    int amv_file_format=0;
289
    uint64_t list_end = 0;
290

    
291
    avi->stream_index= -1;
292

    
293
    if (get_riff(s, pb) < 0)
294
        return -1;
295

    
296
    avi->fsize = url_fsize(pb);
297
    if(avi->fsize<=0)
298
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
299

    
300
    /* first list tag */
301
    stream_index = -1;
302
    codec_type = -1;
303
    frame_period = 0;
304
    for(;;) {
305
        if (url_feof(pb))
306
            goto fail;
307
        tag = get_le32(pb);
308
        size = get_le32(pb);
309
#ifdef DEBUG
310
        print_tag("tag", tag, size);
311
#endif
312

    
313
        switch(tag) {
314
        case MKTAG('L', 'I', 'S', 'T'):
315
            list_end = url_ftell(pb) + size;
316
            /* Ignored, except at start of video packets. */
317
            tag1 = get_le32(pb);
318
#ifdef DEBUG
319
            print_tag("list", tag1, 0);
320
#endif
321
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
322
                avi->movi_list = url_ftell(pb) - 4;
323
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
324
                else     avi->movi_end = url_fsize(pb);
325
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
326
                goto end_of_header;
327
            }
328
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
329
                avi_read_info(s, list_end);
330

    
331
            break;
332
        case MKTAG('d', 'm', 'l', 'h'):
333
            avi->is_odml = 1;
334
            url_fskip(pb, size + (size & 1));
335
            break;
336
        case MKTAG('a', 'm', 'v', 'h'):
337
            amv_file_format=1;
338
        case MKTAG('a', 'v', 'i', 'h'):
339
            /* AVI header */
340
            /* using frame_period is bad idea */
341
            frame_period = get_le32(pb);
342
            bit_rate = get_le32(pb) * 8;
343
            get_le32(pb);
344
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
345

    
346
            url_fskip(pb, 2 * 4);
347
            get_le32(pb);
348
            get_le32(pb);
349
            avih_width=get_le32(pb);
350
            avih_height=get_le32(pb);
351

    
352
            url_fskip(pb, size - 10 * 4);
353
            break;
354
        case MKTAG('s', 't', 'r', 'h'):
355
            /* stream header */
356

    
357
            tag1 = get_le32(pb);
358
            handler = get_le32(pb); /* codec tag */
359

    
360
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
361
                url_fskip(pb, size - 8);
362
                break;
363
            }else{
364
                stream_index++;
365
                st = av_new_stream(s, stream_index);
366
                if (!st)
367
                    goto fail;
368

    
369
                ast = av_mallocz(sizeof(AVIStream));
370
                if (!ast)
371
                    goto fail;
372
                st->priv_data = ast;
373
            }
374
            if(amv_file_format)
375
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
376

    
377
#ifdef DEBUG
378
            print_tag("strh", tag1, -1);
379
#endif
380
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
381
                int64_t dv_dur;
382

    
383
                /*
384
                 * After some consideration -- I don't think we
385
                 * have to support anything but DV in type1 AVIs.
386
                 */
387
                if (s->nb_streams != 1)
388
                    goto fail;
389

    
390
                if (handler != MKTAG('d', 'v', 's', 'd') &&
391
                    handler != MKTAG('d', 'v', 'h', 'd') &&
392
                    handler != MKTAG('d', 'v', 's', 'l'))
393
                   goto fail;
394

    
395
                ast = s->streams[0]->priv_data;
396
                av_freep(&s->streams[0]->codec->extradata);
397
                av_freep(&s->streams[0]);
398
                s->nb_streams = 0;
399
                if (CONFIG_DV_DEMUXER) {
400
                    avi->dv_demux = dv_init_demux(s);
401
                    if (!avi->dv_demux)
402
                        goto fail;
403
                }
404
                s->streams[0]->priv_data = ast;
405
                url_fskip(pb, 3 * 4);
406
                ast->scale = get_le32(pb);
407
                ast->rate = get_le32(pb);
408
                url_fskip(pb, 4);  /* start time */
409

    
410
                dv_dur = get_le32(pb);
411
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
412
                    dv_dur *= AV_TIME_BASE;
413
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
414
                }
415
                /*
416
                 * else, leave duration alone; timing estimation in utils.c
417
                 *      will make a guess based on bitrate.
418
                 */
419

    
420
                stream_index = s->nb_streams - 1;
421
                url_fskip(pb, size - 9*4);
422
                break;
423
            }
424

    
425
            assert(stream_index < s->nb_streams);
426
            st->codec->stream_codec_tag= handler;
427

    
428
            get_le32(pb); /* flags */
429
            get_le16(pb); /* priority */
430
            get_le16(pb); /* language */
431
            get_le32(pb); /* initial frame */
432
            ast->scale = get_le32(pb);
433
            ast->rate = get_le32(pb);
434
            if(!(ast->scale && ast->rate)){
435
                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);
436
                if(frame_period){
437
                    ast->rate = 1000000;
438
                    ast->scale = frame_period;
439
                }else{
440
                    ast->rate = 25;
441
                    ast->scale = 1;
442
                }
443
            }
444
            av_set_pts_info(st, 64, ast->scale, ast->rate);
445

    
446
            ast->cum_len=get_le32(pb); /* start */
447
            st->nb_frames = get_le32(pb);
448

    
449
            st->start_time = 0;
450
            get_le32(pb); /* buffer size */
451
            get_le32(pb); /* quality */
452
            ast->sample_size = get_le32(pb); /* sample ssize */
453
            ast->cum_len *= FFMAX(1, ast->sample_size);
454
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
455

    
456
            switch(tag1) {
457
            case MKTAG('v', 'i', 'd', 's'):
458
                codec_type = AVMEDIA_TYPE_VIDEO;
459

    
460
                ast->sample_size = 0;
461
                break;
462
            case MKTAG('a', 'u', 'd', 's'):
463
                codec_type = AVMEDIA_TYPE_AUDIO;
464
                break;
465
            case MKTAG('t', 'x', 't', 's'):
466
                //FIXME
467
                codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ?  FIXME
468
                break;
469
            case MKTAG('d', 'a', 't', 's'):
470
                codec_type = AVMEDIA_TYPE_DATA;
471
                break;
472
            default:
473
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
474
                goto fail;
475
            }
476
            if(ast->sample_size == 0)
477
                st->duration = st->nb_frames;
478
            ast->frame_offset= ast->cum_len;
479
            url_fskip(pb, size - 12 * 4);
480
            break;
481
        case MKTAG('s', 't', 'r', 'f'):
482
            /* stream header */
483
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
484
                url_fskip(pb, size);
485
            } else {
486
                uint64_t cur_pos = url_ftell(pb);
487
                if (cur_pos < list_end)
488
                    size = FFMIN(size, list_end - cur_pos);
489
                st = s->streams[stream_index];
490
                switch(codec_type) {
491
                case AVMEDIA_TYPE_VIDEO:
492
                    if(amv_file_format){
493
                        st->codec->width=avih_width;
494
                        st->codec->height=avih_height;
495
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
496
                        st->codec->codec_id = CODEC_ID_AMV;
497
                        url_fskip(pb, size);
498
                        break;
499
                    }
500
                    get_le32(pb); /* size */
501
                    st->codec->width = get_le32(pb);
502
                    st->codec->height = (int32_t)get_le32(pb);
503
                    get_le16(pb); /* panes */
504
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
505
                    tag1 = get_le32(pb);
506
                    get_le32(pb); /* ImageSize */
507
                    get_le32(pb); /* XPelsPerMeter */
508
                    get_le32(pb); /* YPelsPerMeter */
509
                    get_le32(pb); /* ClrUsed */
510
                    get_le32(pb); /* ClrImportant */
511

    
512
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
513
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
514
                        st->codec->codec_tag = tag1;
515
                        st->codec->codec_id = CODEC_ID_XSUB;
516
                        break;
517
                    }
518

    
519
                    if(size > 10*4 && size<(1<<30)){
520
                        st->codec->extradata_size= size - 10*4;
521
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
522
                        if (!st->codec->extradata) {
523
                            st->codec->extradata_size= 0;
524
                            return AVERROR(ENOMEM);
525
                        }
526
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
527
                    }
528

    
529
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
530
                        get_byte(pb);
531

    
532
                    /* Extract palette from extradata if bpp <= 8. */
533
                    /* This code assumes that extradata contains only palette. */
534
                    /* This is true for all paletted codecs implemented in FFmpeg. */
535
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
536
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
537
#if HAVE_BIGENDIAN
538
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
539
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
540
#else
541
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
542
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
543
#endif
544
                        st->codec->palctrl->palette_changed = 1;
545
                    }
546

    
547
#ifdef DEBUG
548
                    print_tag("video", tag1, 0);
549
#endif
550
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
551
                    st->codec->codec_tag = tag1;
552
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
553
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
554
                    // Support "Resolution 1:1" for Avid AVI Codec
555
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
556
                       st->codec->extradata_size >= 31 &&
557
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
558
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
559

    
560
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
561
                        st->codec->extradata_size+= 9;
562
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
563
                        if(st->codec->extradata)
564
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
565
                    }
566
                    st->codec->height= FFABS(st->codec->height);
567

    
568
//                    url_fskip(pb, size - 5 * 4);
569
                    break;
570
                case AVMEDIA_TYPE_AUDIO:
571
                    ff_get_wav_header(pb, st->codec, size);
572
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
573
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
574
                        ast->sample_size= st->codec->block_align;
575
                    }
576
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
577
                        url_fskip(pb, 1);
578
                    /* Force parsing as several audio frames can be in
579
                     * one packet and timestamps refer to packet start. */
580
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
581
                    /* ADTS header is in extradata, AAC without header must be
582
                     * stored as exact frames. Parser not needed and it will
583
                     * fail. */
584
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
585
                        st->need_parsing = AVSTREAM_PARSE_NONE;
586
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
587
                     * audio in the header but have Axan as stream_code_tag. */
588
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
589
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
590
                        st->codec->codec_tag = 0;
591
                    }
592
                    if (amv_file_format)
593
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
594
                    break;
595
                default:
596
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
597
                    st->codec->codec_id= CODEC_ID_NONE;
598
                    st->codec->codec_tag= 0;
599
                    url_fskip(pb, size);
600
                    break;
601
                }
602
            }
603
            break;
604
        case MKTAG('i', 'n', 'd', 'x'):
605
            i= url_ftell(pb);
606
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
607
                read_braindead_odml_indx(s, 0);
608
            }
609
            url_fseek(pb, i+size, SEEK_SET);
610
            break;
611
        case MKTAG('v', 'p', 'r', 'p'):
612
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
613
                AVRational active, active_aspect;
614

    
615
                st = s->streams[stream_index];
616
                get_le32(pb);
617
                get_le32(pb);
618
                get_le32(pb);
619
                get_le32(pb);
620
                get_le32(pb);
621

    
622
                active_aspect.den= get_le16(pb);
623
                active_aspect.num= get_le16(pb);
624
                active.num       = get_le32(pb);
625
                active.den       = get_le32(pb);
626
                get_le32(pb); //nbFieldsPerFrame
627

    
628
                if(active_aspect.num && active_aspect.den && active.num && active.den){
629
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
630
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
631
                }
632
                size -= 9*4;
633
            }
634
            url_fseek(pb, size, SEEK_CUR);
635
            break;
636
        case MKTAG('s', 't', 'r', 'n'):
637
            if(s->nb_streams){
638
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
639
                break;
640
            }
641
        default:
642
            if(size > 1000000){
643
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
644
                                        "I will ignore it and try to continue anyway.\n");
645
                avi->movi_list = url_ftell(pb) - 4;
646
                avi->movi_end  = url_fsize(pb);
647
                goto end_of_header;
648
            }
649
            /* skip tag */
650
            size += (size & 1);
651
            url_fskip(pb, size);
652
            break;
653
        }
654
    }
655
 end_of_header:
656
    /* check stream number */
657
    if (stream_index != s->nb_streams - 1) {
658
    fail:
659
        return -1;
660
    }
661

    
662
    if(!avi->index_loaded && !url_is_streamed(pb))
663
        avi_load_index(s);
664
    avi->index_loaded = 1;
665
    avi->non_interleaved |= guess_ni_flag(s);
666
    for(i=0; i<s->nb_streams; i++){
667
        AVStream *st = s->streams[i];
668
        if(st->nb_index_entries)
669
            break;
670
    }
671
    if(i==s->nb_streams && avi->non_interleaved) {
672
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
673
        avi->non_interleaved=0;
674
    }
675

    
676
    if(avi->non_interleaved) {
677
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
678
        clean_index(s);
679
    }
680

    
681
    return 0;
682
}
683

    
684
static int get_stream_idx(int *d){
685
    if(    d[0] >= '0' && d[0] <= '9'
686
        && d[1] >= '0' && d[1] <= '9'){
687
        return (d[0] - '0') * 10 + (d[1] - '0');
688
    }else{
689
        return 100; //invalid stream ID
690
    }
691
}
692

    
693
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
694
{
695
    AVIContext *avi = s->priv_data;
696
    ByteIOContext *pb = s->pb;
697
    int n, d[8];
698
    unsigned int size;
699
    int64_t i, sync;
700
    void* dstr;
701

    
702
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
703
        int size = dv_get_packet(avi->dv_demux, pkt);
704
        if (size >= 0)
705
            return size;
706
    }
707

    
708
    if(avi->non_interleaved){
709
        int best_stream_index = 0;
710
        AVStream *best_st= NULL;
711
        AVIStream *best_ast;
712
        int64_t best_ts= INT64_MAX;
713
        int i;
714

    
715
        for(i=0; i<s->nb_streams; i++){
716
            AVStream *st = s->streams[i];
717
            AVIStream *ast = st->priv_data;
718
            int64_t ts= ast->frame_offset;
719
            int64_t last_ts;
720

    
721
            if(!st->nb_index_entries)
722
                continue;
723

    
724
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
725
            if(!ast->remaining && ts > last_ts)
726
                continue;
727

    
728
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
729

    
730
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
731
            if(ts < best_ts){
732
                best_ts= ts;
733
                best_st= st;
734
                best_stream_index= i;
735
            }
736
        }
737
        if(!best_st)
738
            return -1;
739

    
740
        best_ast = best_st->priv_data;
741
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
742
        if(best_ast->remaining)
743
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
744
        else{
745
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
746
            if(i>=0)
747
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
748
        }
749

    
750
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
751
        if(i>=0){
752
            int64_t pos= best_st->index_entries[i].pos;
753
            pos += best_ast->packet_size - best_ast->remaining;
754
            url_fseek(s->pb, pos + 8, SEEK_SET);
755
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
756

    
757
            assert(best_ast->remaining <= best_ast->packet_size);
758

    
759
            avi->stream_index= best_stream_index;
760
            if(!best_ast->remaining)
761
                best_ast->packet_size=
762
                best_ast->remaining= best_st->index_entries[i].size;
763
        }
764
    }
765

    
766
resync:
767
    if(avi->stream_index >= 0){
768
        AVStream *st= s->streams[ avi->stream_index ];
769
        AVIStream *ast= st->priv_data;
770
        int size, err;
771

    
772
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
773
            size= INT_MAX;
774
        else if(ast->sample_size < 32)
775
            // arbitrary multiplier to avoid tiny packets for raw PCM data
776
            size= 1024*ast->sample_size;
777
        else
778
            size= ast->sample_size;
779

    
780
        if(size > ast->remaining)
781
            size= ast->remaining;
782
        avi->last_pkt_pos= url_ftell(pb);
783
        err= av_get_packet(pb, pkt, size);
784
        if(err<0)
785
            return err;
786

    
787
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
788
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
789
            if(ptr){
790
            ast->has_pal=0;
791
            pkt->size += 4*256;
792
            pkt->data= ptr;
793
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
794
            }else
795
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
796
        }
797

    
798
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
799
            dstr = pkt->destruct;
800
            size = dv_produce_packet(avi->dv_demux, pkt,
801
                                    pkt->data, pkt->size);
802
            pkt->destruct = dstr;
803
            pkt->flags |= AV_PKT_FLAG_KEY;
804
        } else {
805
            /* XXX: How to handle B-frames in AVI? */
806
            pkt->dts = ast->frame_offset;
807
//                pkt->dts += ast->start;
808
            if(ast->sample_size)
809
                pkt->dts /= ast->sample_size;
810
//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);
811
            pkt->stream_index = avi->stream_index;
812

    
813
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
814
                AVIndexEntry *e;
815
                int index;
816
                assert(st->index_entries);
817

    
818
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
819
                e= &st->index_entries[index];
820

    
821
                if(index >= 0 && e->timestamp == ast->frame_offset){
822
                    if (e->flags & AVINDEX_KEYFRAME)
823
                        pkt->flags |= AV_PKT_FLAG_KEY;
824
                }
825
            } else {
826
                pkt->flags |= AV_PKT_FLAG_KEY;
827
            }
828
            ast->frame_offset += get_duration(ast, pkt->size);
829
        }
830
        ast->remaining -= size;
831
        if(!ast->remaining){
832
            avi->stream_index= -1;
833
            ast->packet_size= 0;
834
        }
835

    
836
        return size;
837
    }
838

    
839
    memset(d, -1, sizeof(int)*8);
840
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
841
        int j;
842

    
843
        for(j=0; j<7; j++)
844
            d[j]= d[j+1];
845
        d[7]= get_byte(pb);
846

    
847
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
848

    
849
        n= get_stream_idx(d+2);
850
//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);
851
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
852
            continue;
853

    
854
        //parse ix##
855
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
856
        //parse JUNK
857
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
858
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
859
            url_fskip(pb, size);
860
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
861
            goto resync;
862
        }
863

    
864
        //parse stray LIST
865
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
866
            url_fskip(pb, 4);
867
            goto resync;
868
        }
869

    
870
        n= get_stream_idx(d);
871

    
872
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
873
            continue;
874

    
875
        //detect ##ix chunk and skip
876
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
877
            url_fskip(pb, size);
878
            goto resync;
879
        }
880

    
881
        //parse ##dc/##wb
882
        if(n < s->nb_streams){
883
            AVStream *st;
884
            AVIStream *ast;
885
            st = s->streams[n];
886
            ast = st->priv_data;
887

    
888
            if(s->nb_streams>=2){
889
                AVStream *st1  = s->streams[1];
890
                AVIStream *ast1= st1->priv_data;
891
                //workaround for broken small-file-bug402.avi
892
                if(   d[2] == 'w' && d[3] == 'b'
893
                   && n==0
894
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
895
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
896
                   && ast->prefix == 'd'*256+'c'
897
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
898
                  ){
899
                    n=1;
900
                    st = st1;
901
                    ast = ast1;
902
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
903
                }
904
            }
905

    
906

    
907
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
908
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
909
               || st->discard >= AVDISCARD_ALL){
910
                ast->frame_offset += get_duration(ast, size);
911
                url_fskip(pb, size);
912
                goto resync;
913
            }
914

    
915
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
916
                int k = get_byte(pb);
917
                int last = (k + get_byte(pb) - 1) & 0xFF;
918

    
919
                get_le16(pb); //flags
920

    
921
                for (; k <= last; k++)
922
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
923
                ast->has_pal= 1;
924
                goto resync;
925
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
926
                         d[2]*256+d[3] == ast->prefix /*||
927
                         (d[2] == 'd' && d[3] == 'c') ||
928
                         (d[2] == 'w' && d[3] == 'b')*/) {
929

    
930
//av_log(s, AV_LOG_DEBUG, "OK\n");
931
                if(d[2]*256+d[3] == ast->prefix)
932
                    ast->prefix_count++;
933
                else{
934
                    ast->prefix= d[2]*256+d[3];
935
                    ast->prefix_count= 0;
936
                }
937

    
938
                avi->stream_index= n;
939
                ast->packet_size= size + 8;
940
                ast->remaining= size;
941

    
942
                if(size || !ast->sample_size){
943
                    uint64_t pos= url_ftell(pb) - 8;
944
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
945
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
946
                    }
947
                }
948
                goto resync;
949
            }
950
        }
951
    }
952

    
953
    return AVERROR_EOF;
954
}
955

    
956
/* XXX: We make the implicit supposition that the positions are sorted
957
   for each stream. */
958
static int avi_read_idx1(AVFormatContext *s, int size)
959
{
960
    AVIContext *avi = s->priv_data;
961
    ByteIOContext *pb = s->pb;
962
    int nb_index_entries, i;
963
    AVStream *st;
964
    AVIStream *ast;
965
    unsigned int index, tag, flags, pos, len;
966
    unsigned last_pos= -1;
967

    
968
    nb_index_entries = size / 16;
969
    if (nb_index_entries <= 0)
970
        return -1;
971

    
972
    /* Read the entries and sort them in each stream component. */
973
    for(i = 0; i < nb_index_entries; i++) {
974
        tag = get_le32(pb);
975
        flags = get_le32(pb);
976
        pos = get_le32(pb);
977
        len = get_le32(pb);
978
#if defined(DEBUG_SEEK)
979
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
980
               i, tag, flags, pos, len);
981
#endif
982
        if(i==0 && pos > avi->movi_list)
983
            avi->movi_list= 0; //FIXME better check
984
        pos += avi->movi_list;
985

    
986
        index = ((tag & 0xff) - '0') * 10;
987
        index += ((tag >> 8) & 0xff) - '0';
988
        if (index >= s->nb_streams)
989
            continue;
990
        st = s->streams[index];
991
        ast = st->priv_data;
992

    
993
#if defined(DEBUG_SEEK)
994
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
995
#endif
996
        if(url_feof(pb))
997
            return -1;
998

    
999
        if(last_pos == pos)
1000
            avi->non_interleaved= 1;
1001
        else if(len || !ast->sample_size)
1002
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1003
        ast->cum_len += get_duration(ast, len);
1004
        last_pos= pos;
1005
    }
1006
    return 0;
1007
}
1008

    
1009
static int guess_ni_flag(AVFormatContext *s){
1010
    int i;
1011
    int64_t last_start=0;
1012
    int64_t first_end= INT64_MAX;
1013
    int64_t oldpos= url_ftell(s->pb);
1014

    
1015
    for(i=0; i<s->nb_streams; i++){
1016
        AVStream *st = s->streams[i];
1017
        int n= st->nb_index_entries;
1018
        unsigned int size;
1019

    
1020
        if(n <= 0)
1021
            continue;
1022

    
1023
        if(n >= 2){
1024
            int64_t pos= st->index_entries[0].pos;
1025
            url_fseek(s->pb, pos + 4, SEEK_SET);
1026
            size= get_le32(s->pb);
1027
            if(pos + size > st->index_entries[1].pos)
1028
                last_start= INT64_MAX;
1029
        }
1030

    
1031
        if(st->index_entries[0].pos > last_start)
1032
            last_start= st->index_entries[0].pos;
1033
        if(st->index_entries[n-1].pos < first_end)
1034
            first_end= st->index_entries[n-1].pos;
1035
    }
1036
    url_fseek(s->pb, oldpos, SEEK_SET);
1037
    return last_start > first_end;
1038
}
1039

    
1040
static int avi_load_index(AVFormatContext *s)
1041
{
1042
    AVIContext *avi = s->priv_data;
1043
    ByteIOContext *pb = s->pb;
1044
    uint32_t tag, size;
1045
    int64_t pos= url_ftell(pb);
1046
    int ret = -1;
1047

    
1048
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1049
        goto the_end; // maybe truncated file
1050
#ifdef DEBUG_SEEK
1051
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1052
#endif
1053
    for(;;) {
1054
        if (url_feof(pb))
1055
            break;
1056
        tag = get_le32(pb);
1057
        size = get_le32(pb);
1058
#ifdef DEBUG_SEEK
1059
        printf("tag=%c%c%c%c size=0x%x\n",
1060
               tag & 0xff,
1061
               (tag >> 8) & 0xff,
1062
               (tag >> 16) & 0xff,
1063
               (tag >> 24) & 0xff,
1064
               size);
1065
#endif
1066
        switch(tag) {
1067
        case MKTAG('i', 'd', 'x', '1'):
1068
            if (avi_read_idx1(s, size) < 0)
1069
                goto skip;
1070
            ret = 0;
1071
                goto the_end;
1072
            break;
1073
        default:
1074
        skip:
1075
            size += (size & 1);
1076
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1077
                goto the_end; // something is wrong here
1078
            break;
1079
        }
1080
    }
1081
 the_end:
1082
    url_fseek(pb, pos, SEEK_SET);
1083
    return ret;
1084
}
1085

    
1086
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1087
{
1088
    AVIContext *avi = s->priv_data;
1089
    AVStream *st;
1090
    int i, index;
1091
    int64_t pos;
1092
    AVIStream *ast;
1093

    
1094
    if (!avi->index_loaded) {
1095
        /* we only load the index on demand */
1096
        avi_load_index(s);
1097
        avi->index_loaded = 1;
1098
    }
1099
    assert(stream_index>= 0);
1100

    
1101
    st = s->streams[stream_index];
1102
    ast= st->priv_data;
1103
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1104
    if(index<0)
1105
        return -1;
1106

    
1107
    /* find the position */
1108
    pos = st->index_entries[index].pos;
1109
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1110

    
1111
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1112

    
1113
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1114
        /* One and only one real stream for DV in AVI, and it has video  */
1115
        /* offsets. Calling with other stream indexes should have failed */
1116
        /* the av_index_search_timestamp call above.                     */
1117
        assert(stream_index == 0);
1118

    
1119
        /* Feed the DV video stream version of the timestamp to the */
1120
        /* DV demux so it can synthesize correct timestamps.        */
1121
        dv_offset_reset(avi->dv_demux, timestamp);
1122

    
1123
        url_fseek(s->pb, pos, SEEK_SET);
1124
        avi->stream_index= -1;
1125
        return 0;
1126
    }
1127

    
1128
    for(i = 0; i < s->nb_streams; i++) {
1129
        AVStream *st2 = s->streams[i];
1130
        AVIStream *ast2 = st2->priv_data;
1131

    
1132
        ast2->packet_size=
1133
        ast2->remaining= 0;
1134

    
1135
        if (st2->nb_index_entries <= 0)
1136
            continue;
1137

    
1138
//        assert(st2->codec->block_align);
1139
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1140
        index = av_index_search_timestamp(
1141
                st2,
1142
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1143
                flags | AVSEEK_FLAG_BACKWARD);
1144
        if(index<0)
1145
            index=0;
1146

    
1147
        if(!avi->non_interleaved){
1148
            while(index>0 && st2->index_entries[index].pos > pos)
1149
                index--;
1150
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1151
                index++;
1152
        }
1153

    
1154
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1155
        /* extract the current frame number */
1156
        ast2->frame_offset = st2->index_entries[index].timestamp;
1157
    }
1158

    
1159
    /* do the seek */
1160
    url_fseek(s->pb, pos, SEEK_SET);
1161
    avi->stream_index= -1;
1162
    return 0;
1163
}
1164

    
1165
static int avi_read_close(AVFormatContext *s)
1166
{
1167
    int i;
1168
    AVIContext *avi = s->priv_data;
1169

    
1170
    for(i=0;i<s->nb_streams;i++) {
1171
        AVStream *st = s->streams[i];
1172
        av_free(st->codec->palctrl);
1173
    }
1174

    
1175
    if (avi->dv_demux)
1176
        av_free(avi->dv_demux);
1177

    
1178
    return 0;
1179
}
1180

    
1181
static int avi_probe(AVProbeData *p)
1182
{
1183
    int i;
1184

    
1185
    /* check file header */
1186
    for(i=0; avi_headers[i][0]; i++)
1187
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1188
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1189
            return AVPROBE_SCORE_MAX;
1190

    
1191
    return 0;
1192
}
1193

    
1194
AVInputFormat avi_demuxer = {
1195
    "avi",
1196
    NULL_IF_CONFIG_SMALL("AVI format"),
1197
    sizeof(AVIContext),
1198
    avi_probe,
1199
    avi_read_header,
1200
    avi_read_packet,
1201
    avi_read_close,
1202
    avi_read_seek,
1203
    .metadata_conv = ff_avi_metadata_conv,
1204
};