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ffmpeg / libavformat / avidec.c @ 72415b2a

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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
} 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 && (len || !ast->sample_size))
174
                av_add_index_entry(st, pos, ast->cum_len, 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, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
226
        }
227
    }
228
}
229

    
230
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
231
{
232
    ByteIOContext *pb = s->pb;
233
    char key[5] = {0}, *value;
234

    
235
    size += (size & 1);
236

    
237
    if (size == UINT_MAX)
238
        return -1;
239
    value = av_malloc(size+1);
240
    if (!value)
241
        return -1;
242
    get_buffer(pb, value, size);
243
    value[size]=0;
244

    
245
    AV_WL32(key, tag);
246

    
247
    if(st)
248
        return av_metadata_set2(&st->metadata, key, value,
249
                                    AV_METADATA_DONT_STRDUP_VAL);
250
    else
251
    return av_metadata_set2(&s->metadata, key, value,
252
                                  AV_METADATA_DONT_STRDUP_VAL);
253
}
254

    
255
static void avi_read_info(AVFormatContext *s, uint64_t end)
256
{
257
    while (url_ftell(s->pb) < end) {
258
        uint32_t tag  = get_le32(s->pb);
259
        uint32_t size = get_le32(s->pb);
260
        avi_read_tag(s, NULL, tag, size);
261
    }
262
}
263

    
264
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
265
{
266
    AVIContext *avi = s->priv_data;
267
    ByteIOContext *pb = s->pb;
268
    unsigned int tag, tag1, handler;
269
    int codec_type, stream_index, frame_period, bit_rate;
270
    unsigned int size;
271
    int i;
272
    AVStream *st;
273
    AVIStream *ast = NULL;
274
    int avih_width=0, avih_height=0;
275
    int amv_file_format=0;
276
    uint64_t list_end = 0;
277

    
278
    avi->stream_index= -1;
279

    
280
    if (get_riff(s, pb) < 0)
281
        return -1;
282

    
283
    avi->fsize = url_fsize(pb);
284
    if(avi->fsize<=0)
285
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
286

    
287
    /* first list tag */
288
    stream_index = -1;
289
    codec_type = -1;
290
    frame_period = 0;
291
    for(;;) {
292
        if (url_feof(pb))
293
            goto fail;
294
        tag = get_le32(pb);
295
        size = get_le32(pb);
296
#ifdef DEBUG
297
        print_tag("tag", tag, size);
298
#endif
299

    
300
        switch(tag) {
301
        case MKTAG('L', 'I', 'S', 'T'):
302
            list_end = url_ftell(pb) + size;
303
            /* Ignored, except at start of video packets. */
304
            tag1 = get_le32(pb);
305
#ifdef DEBUG
306
            print_tag("list", tag1, 0);
307
#endif
308
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
309
                avi->movi_list = url_ftell(pb) - 4;
310
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
311
                else     avi->movi_end = url_fsize(pb);
312
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
313
                goto end_of_header;
314
            }
315
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
316
                avi_read_info(s, list_end);
317

    
318
            break;
319
        case MKTAG('d', 'm', 'l', 'h'):
320
            avi->is_odml = 1;
321
            url_fskip(pb, size + (size & 1));
322
            break;
323
        case MKTAG('a', 'm', 'v', 'h'):
324
            amv_file_format=1;
325
        case MKTAG('a', 'v', 'i', 'h'):
326
            /* AVI header */
327
            /* using frame_period is bad idea */
328
            frame_period = get_le32(pb);
329
            bit_rate = get_le32(pb) * 8;
330
            get_le32(pb);
331
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
332

    
333
            url_fskip(pb, 2 * 4);
334
            get_le32(pb);
335
            get_le32(pb);
336
            avih_width=get_le32(pb);
337
            avih_height=get_le32(pb);
338

    
339
            url_fskip(pb, size - 10 * 4);
340
            break;
341
        case MKTAG('s', 't', 'r', 'h'):
342
            /* stream header */
343

    
344
            tag1 = get_le32(pb);
345
            handler = get_le32(pb); /* codec tag */
346

    
347
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
348
                url_fskip(pb, size - 8);
349
                break;
350
            }else{
351
                stream_index++;
352
                st = av_new_stream(s, stream_index);
353
                if (!st)
354
                    goto fail;
355

    
356
                ast = av_mallocz(sizeof(AVIStream));
357
                if (!ast)
358
                    goto fail;
359
                st->priv_data = ast;
360
            }
361
            if(amv_file_format)
362
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
363

    
364
#ifdef DEBUG
365
            print_tag("strh", tag1, -1);
366
#endif
367
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
368
                int64_t dv_dur;
369

    
370
                /*
371
                 * After some consideration -- I don't think we
372
                 * have to support anything but DV in type1 AVIs.
373
                 */
374
                if (s->nb_streams != 1)
375
                    goto fail;
376

    
377
                if (handler != MKTAG('d', 'v', 's', 'd') &&
378
                    handler != MKTAG('d', 'v', 'h', 'd') &&
379
                    handler != MKTAG('d', 'v', 's', 'l'))
380
                   goto fail;
381

    
382
                ast = s->streams[0]->priv_data;
383
                av_freep(&s->streams[0]->codec->extradata);
384
                av_freep(&s->streams[0]);
385
                s->nb_streams = 0;
386
                if (CONFIG_DV_DEMUXER) {
387
                    avi->dv_demux = dv_init_demux(s);
388
                    if (!avi->dv_demux)
389
                        goto fail;
390
                }
391
                s->streams[0]->priv_data = ast;
392
                url_fskip(pb, 3 * 4);
393
                ast->scale = get_le32(pb);
394
                ast->rate = get_le32(pb);
395
                url_fskip(pb, 4);  /* start time */
396

    
397
                dv_dur = get_le32(pb);
398
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
399
                    dv_dur *= AV_TIME_BASE;
400
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
401
                }
402
                /*
403
                 * else, leave duration alone; timing estimation in utils.c
404
                 *      will make a guess based on bitrate.
405
                 */
406

    
407
                stream_index = s->nb_streams - 1;
408
                url_fskip(pb, size - 9*4);
409
                break;
410
            }
411

    
412
            assert(stream_index < s->nb_streams);
413
            st->codec->stream_codec_tag= handler;
414

    
415
            get_le32(pb); /* flags */
416
            get_le16(pb); /* priority */
417
            get_le16(pb); /* language */
418
            get_le32(pb); /* initial frame */
419
            ast->scale = get_le32(pb);
420
            ast->rate = get_le32(pb);
421
            if(!(ast->scale && ast->rate)){
422
                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);
423
                if(frame_period){
424
                    ast->rate = 1000000;
425
                    ast->scale = frame_period;
426
                }else{
427
                    ast->rate = 25;
428
                    ast->scale = 1;
429
                }
430
            }
431
            av_set_pts_info(st, 64, ast->scale, ast->rate);
432

    
433
            ast->cum_len=get_le32(pb); /* start */
434
            st->nb_frames = get_le32(pb);
435

    
436
            st->start_time = 0;
437
            get_le32(pb); /* buffer size */
438
            get_le32(pb); /* quality */
439
            ast->sample_size = get_le32(pb); /* sample ssize */
440
            ast->cum_len *= FFMAX(1, ast->sample_size);
441
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
442

    
443
            switch(tag1) {
444
            case MKTAG('v', 'i', 'd', 's'):
445
                codec_type = AVMEDIA_TYPE_VIDEO;
446

    
447
                ast->sample_size = 0;
448
                break;
449
            case MKTAG('a', 'u', 'd', 's'):
450
                codec_type = AVMEDIA_TYPE_AUDIO;
451
                break;
452
            case MKTAG('t', 'x', 't', 's'):
453
                //FIXME
454
                codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ?  FIXME
455
                break;
456
            case MKTAG('d', 'a', 't', 's'):
457
                codec_type = AVMEDIA_TYPE_DATA;
458
                break;
459
            default:
460
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
461
                goto fail;
462
            }
463
            if(ast->sample_size == 0)
464
                st->duration = st->nb_frames;
465
            ast->frame_offset= ast->cum_len;
466
            url_fskip(pb, size - 12 * 4);
467
            break;
468
        case MKTAG('s', 't', 'r', 'f'):
469
            /* stream header */
470
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
471
                url_fskip(pb, size);
472
            } else {
473
                uint64_t cur_pos = url_ftell(pb);
474
                if (cur_pos < list_end)
475
                    size = FFMIN(size, list_end - cur_pos);
476
                st = s->streams[stream_index];
477
                switch(codec_type) {
478
                case AVMEDIA_TYPE_VIDEO:
479
                    if(amv_file_format){
480
                        st->codec->width=avih_width;
481
                        st->codec->height=avih_height;
482
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
483
                        st->codec->codec_id = CODEC_ID_AMV;
484
                        url_fskip(pb, size);
485
                        break;
486
                    }
487
                    get_le32(pb); /* size */
488
                    st->codec->width = get_le32(pb);
489
                    st->codec->height = (int32_t)get_le32(pb);
490
                    get_le16(pb); /* panes */
491
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
492
                    tag1 = get_le32(pb);
493
                    get_le32(pb); /* ImageSize */
494
                    get_le32(pb); /* XPelsPerMeter */
495
                    get_le32(pb); /* YPelsPerMeter */
496
                    get_le32(pb); /* ClrUsed */
497
                    get_le32(pb); /* ClrImportant */
498

    
499
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
500
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
501
                        st->codec->codec_tag = tag1;
502
                        st->codec->codec_id = CODEC_ID_XSUB;
503
                        break;
504
                    }
505

    
506
                    if(size > 10*4 && size<(1<<30)){
507
                        st->codec->extradata_size= size - 10*4;
508
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
509
                        if (!st->codec->extradata) {
510
                            st->codec->extradata_size= 0;
511
                            return AVERROR(ENOMEM);
512
                        }
513
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
514
                    }
515

    
516
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
517
                        get_byte(pb);
518

    
519
                    /* Extract palette from extradata if bpp <= 8. */
520
                    /* This code assumes that extradata contains only palette. */
521
                    /* This is true for all paletted codecs implemented in FFmpeg. */
522
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
523
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
524
#if HAVE_BIGENDIAN
525
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
526
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
527
#else
528
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
529
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
530
#endif
531
                        st->codec->palctrl->palette_changed = 1;
532
                    }
533

    
534
#ifdef DEBUG
535
                    print_tag("video", tag1, 0);
536
#endif
537
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
538
                    st->codec->codec_tag = tag1;
539
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
540
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
541
                    // Support "Resolution 1:1" for Avid AVI Codec
542
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
543
                       st->codec->extradata_size >= 31 &&
544
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
545
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
546

    
547
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
548
                        st->codec->extradata_size+= 9;
549
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
550
                        if(st->codec->extradata)
551
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
552
                    }
553
                    st->codec->height= FFABS(st->codec->height);
554

    
555
//                    url_fskip(pb, size - 5 * 4);
556
                    break;
557
                case AVMEDIA_TYPE_AUDIO:
558
                    ff_get_wav_header(pb, st->codec, size);
559
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
560
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
561
                        ast->sample_size= st->codec->block_align;
562
                    }
563
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
564
                        url_fskip(pb, 1);
565
                    /* Force parsing as several audio frames can be in
566
                     * one packet and timestamps refer to packet start. */
567
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
568
                    /* ADTS header is in extradata, AAC without header must be
569
                     * stored as exact frames. Parser not needed and it will
570
                     * fail. */
571
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
572
                        st->need_parsing = AVSTREAM_PARSE_NONE;
573
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
574
                     * audio in the header but have Axan as stream_code_tag. */
575
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
576
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
577
                        st->codec->codec_tag = 0;
578
                    }
579
                    if (amv_file_format)
580
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
581
                    break;
582
                default:
583
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
584
                    st->codec->codec_id= CODEC_ID_NONE;
585
                    st->codec->codec_tag= 0;
586
                    url_fskip(pb, size);
587
                    break;
588
                }
589
            }
590
            break;
591
        case MKTAG('i', 'n', 'd', 'x'):
592
            i= url_ftell(pb);
593
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
594
                read_braindead_odml_indx(s, 0);
595
            }
596
            url_fseek(pb, i+size, SEEK_SET);
597
            break;
598
        case MKTAG('v', 'p', 'r', 'p'):
599
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
600
                AVRational active, active_aspect;
601

    
602
                st = s->streams[stream_index];
603
                get_le32(pb);
604
                get_le32(pb);
605
                get_le32(pb);
606
                get_le32(pb);
607
                get_le32(pb);
608

    
609
                active_aspect.den= get_le16(pb);
610
                active_aspect.num= get_le16(pb);
611
                active.num       = get_le32(pb);
612
                active.den       = get_le32(pb);
613
                get_le32(pb); //nbFieldsPerFrame
614

    
615
                if(active_aspect.num && active_aspect.den && active.num && active.den){
616
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
617
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
618
                }
619
                size -= 9*4;
620
            }
621
            url_fseek(pb, size, SEEK_CUR);
622
            break;
623
        case MKTAG('s', 't', 'r', 'n'):
624
            if(s->nb_streams){
625
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
626
                break;
627
            }
628
        default:
629
            if(size > 1000000){
630
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
631
                                        "I will ignore it and try to continue anyway.\n");
632
                avi->movi_list = url_ftell(pb) - 4;
633
                avi->movi_end  = url_fsize(pb);
634
                goto end_of_header;
635
            }
636
            /* skip tag */
637
            size += (size & 1);
638
            url_fskip(pb, size);
639
            break;
640
        }
641
    }
642
 end_of_header:
643
    /* check stream number */
644
    if (stream_index != s->nb_streams - 1) {
645
    fail:
646
        return -1;
647
    }
648

    
649
    if(!avi->index_loaded && !url_is_streamed(pb))
650
        avi_load_index(s);
651
    avi->index_loaded = 1;
652
    avi->non_interleaved |= guess_ni_flag(s);
653
    if(avi->non_interleaved) {
654
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
655
        clean_index(s);
656
    }
657

    
658
    return 0;
659
}
660

    
661
static int get_stream_idx(int *d){
662
    if(    d[0] >= '0' && d[0] <= '9'
663
        && d[1] >= '0' && d[1] <= '9'){
664
        return (d[0] - '0') * 10 + (d[1] - '0');
665
    }else{
666
        return 100; //invalid stream ID
667
    }
668
}
669

    
670
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
671
{
672
    AVIContext *avi = s->priv_data;
673
    ByteIOContext *pb = s->pb;
674
    int n, d[8];
675
    unsigned int size;
676
    int64_t i, sync;
677
    void* dstr;
678

    
679
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
680
        int size = dv_get_packet(avi->dv_demux, pkt);
681
        if (size >= 0)
682
            return size;
683
    }
684

    
685
    if(avi->non_interleaved){
686
        int best_stream_index = 0;
687
        AVStream *best_st= NULL;
688
        AVIStream *best_ast;
689
        int64_t best_ts= INT64_MAX;
690
        int i;
691

    
692
        for(i=0; i<s->nb_streams; i++){
693
            AVStream *st = s->streams[i];
694
            AVIStream *ast = st->priv_data;
695
            int64_t ts= ast->frame_offset;
696
            int64_t last_ts;
697

    
698
            if(!st->nb_index_entries)
699
                continue;
700

    
701
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
702
            if(!ast->remaining && ts > last_ts)
703
                continue;
704

    
705
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
706

    
707
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
708
            if(ts < best_ts){
709
                best_ts= ts;
710
                best_st= st;
711
                best_stream_index= i;
712
            }
713
        }
714
        if(!best_st)
715
            return -1;
716

    
717
        best_ast = best_st->priv_data;
718
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
719
        if(best_ast->remaining)
720
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
721
        else{
722
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
723
            if(i>=0)
724
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
725
        }
726

    
727
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
728
        if(i>=0){
729
            int64_t pos= best_st->index_entries[i].pos;
730
            pos += best_ast->packet_size - best_ast->remaining;
731
            url_fseek(s->pb, pos + 8, SEEK_SET);
732
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
733

    
734
            assert(best_ast->remaining <= best_ast->packet_size);
735

    
736
            avi->stream_index= best_stream_index;
737
            if(!best_ast->remaining)
738
                best_ast->packet_size=
739
                best_ast->remaining= best_st->index_entries[i].size;
740
        }
741
    }
742

    
743
resync:
744
    if(avi->stream_index >= 0){
745
        AVStream *st= s->streams[ avi->stream_index ];
746
        AVIStream *ast= st->priv_data;
747
        int size, err;
748

    
749
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
750
            size= INT_MAX;
751
        else if(ast->sample_size < 32)
752
            // arbitrary multiplier to avoid tiny packets for raw PCM data
753
            size= 1024*ast->sample_size;
754
        else
755
            size= ast->sample_size;
756

    
757
        if(size > ast->remaining)
758
            size= ast->remaining;
759
        avi->last_pkt_pos= url_ftell(pb);
760
        err= av_get_packet(pb, pkt, size);
761
        if(err<0)
762
            return err;
763

    
764
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
765
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
766
            if(ptr){
767
            ast->has_pal=0;
768
            pkt->size += 4*256;
769
            pkt->data= ptr;
770
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
771
            }else
772
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
773
        }
774

    
775
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
776
            dstr = pkt->destruct;
777
            size = dv_produce_packet(avi->dv_demux, pkt,
778
                                    pkt->data, pkt->size);
779
            pkt->destruct = dstr;
780
            pkt->flags |= PKT_FLAG_KEY;
781
        } else {
782
            /* XXX: How to handle B-frames in AVI? */
783
            pkt->dts = ast->frame_offset;
784
//                pkt->dts += ast->start;
785
            if(ast->sample_size)
786
                pkt->dts /= ast->sample_size;
787
//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);
788
            pkt->stream_index = avi->stream_index;
789

    
790
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
791
                AVIndexEntry *e;
792
                int index;
793
                assert(st->index_entries);
794

    
795
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
796
                e= &st->index_entries[index];
797

    
798
                if(index >= 0 && e->timestamp == ast->frame_offset){
799
                    if (e->flags & AVINDEX_KEYFRAME)
800
                        pkt->flags |= PKT_FLAG_KEY;
801
                }
802
            } else {
803
                pkt->flags |= PKT_FLAG_KEY;
804
            }
805
            if(ast->sample_size)
806
                ast->frame_offset += pkt->size;
807
            else
808
                ast->frame_offset++;
809
        }
810
        ast->remaining -= size;
811
        if(!ast->remaining){
812
            avi->stream_index= -1;
813
            ast->packet_size= 0;
814
        }
815

    
816
        return size;
817
    }
818

    
819
    memset(d, -1, sizeof(int)*8);
820
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
821
        int j;
822

    
823
        for(j=0; j<7; j++)
824
            d[j]= d[j+1];
825
        d[7]= get_byte(pb);
826

    
827
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
828

    
829
        n= get_stream_idx(d+2);
830
//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);
831
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
832
            continue;
833

    
834
        //parse ix##
835
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
836
        //parse JUNK
837
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
838
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
839
            url_fskip(pb, size);
840
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
841
            goto resync;
842
        }
843

    
844
        //parse stray LIST
845
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
846
            url_fskip(pb, 4);
847
            goto resync;
848
        }
849

    
850
        n= get_stream_idx(d);
851

    
852
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
853
            continue;
854

    
855
        //detect ##ix chunk and skip
856
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
857
            url_fskip(pb, size);
858
            goto resync;
859
        }
860

    
861
        //parse ##dc/##wb
862
        if(n < s->nb_streams){
863
            AVStream *st;
864
            AVIStream *ast;
865
            st = s->streams[n];
866
            ast = st->priv_data;
867

    
868
            if(s->nb_streams>=2){
869
                AVStream *st1  = s->streams[1];
870
                AVIStream *ast1= st1->priv_data;
871
                //workaround for broken small-file-bug402.avi
872
                if(   d[2] == 'w' && d[3] == 'b'
873
                   && n==0
874
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
875
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
876
                   && ast->prefix == 'd'*256+'c'
877
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
878
                  ){
879
                    n=1;
880
                    st = st1;
881
                    ast = ast1;
882
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
883
                }
884
            }
885

    
886

    
887
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
888
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
889
               || st->discard >= AVDISCARD_ALL){
890
                if(ast->sample_size) ast->frame_offset += pkt->size;
891
                else                 ast->frame_offset++;
892
                url_fskip(pb, size);
893
                goto resync;
894
            }
895

    
896
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
897
                int k = get_byte(pb);
898
                int last = (k + get_byte(pb) - 1) & 0xFF;
899

    
900
                get_le16(pb); //flags
901

    
902
                for (; k <= last; k++)
903
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
904
                ast->has_pal= 1;
905
                goto resync;
906
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
907
                         d[2]*256+d[3] == ast->prefix /*||
908
                         (d[2] == 'd' && d[3] == 'c') ||
909
                         (d[2] == 'w' && d[3] == 'b')*/) {
910

    
911
//av_log(s, AV_LOG_DEBUG, "OK\n");
912
                if(d[2]*256+d[3] == ast->prefix)
913
                    ast->prefix_count++;
914
                else{
915
                    ast->prefix= d[2]*256+d[3];
916
                    ast->prefix_count= 0;
917
                }
918

    
919
                avi->stream_index= n;
920
                ast->packet_size= size + 8;
921
                ast->remaining= size;
922

    
923
                if(size || !ast->sample_size){
924
                    uint64_t pos= url_ftell(pb) - 8;
925
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
926
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
927
                    }
928
                }
929
                goto resync;
930
            }
931
        }
932
    }
933

    
934
    return AVERROR_EOF;
935
}
936

    
937
/* XXX: We make the implicit supposition that the positions are sorted
938
   for each stream. */
939
static int avi_read_idx1(AVFormatContext *s, int size)
940
{
941
    AVIContext *avi = s->priv_data;
942
    ByteIOContext *pb = s->pb;
943
    int nb_index_entries, i;
944
    AVStream *st;
945
    AVIStream *ast;
946
    unsigned int index, tag, flags, pos, len;
947
    unsigned last_pos= -1;
948

    
949
    nb_index_entries = size / 16;
950
    if (nb_index_entries <= 0)
951
        return -1;
952

    
953
    /* Read the entries and sort them in each stream component. */
954
    for(i = 0; i < nb_index_entries; i++) {
955
        tag = get_le32(pb);
956
        flags = get_le32(pb);
957
        pos = get_le32(pb);
958
        len = get_le32(pb);
959
#if defined(DEBUG_SEEK)
960
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
961
               i, tag, flags, pos, len);
962
#endif
963
        if(i==0 && pos > avi->movi_list)
964
            avi->movi_list= 0; //FIXME better check
965
        pos += avi->movi_list;
966

    
967
        index = ((tag & 0xff) - '0') * 10;
968
        index += ((tag >> 8) & 0xff) - '0';
969
        if (index >= s->nb_streams)
970
            continue;
971
        st = s->streams[index];
972
        ast = st->priv_data;
973

    
974
#if defined(DEBUG_SEEK)
975
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
976
#endif
977
        if(url_feof(pb))
978
            return -1;
979

    
980
        if(last_pos == pos)
981
            avi->non_interleaved= 1;
982
        else if(len || !ast->sample_size)
983
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
984
        if(ast->sample_size)
985
            ast->cum_len += len;
986
        else
987
            ast->cum_len ++;
988
        last_pos= pos;
989
    }
990
    return 0;
991
}
992

    
993
static int guess_ni_flag(AVFormatContext *s){
994
    int i;
995
    int64_t last_start=0;
996
    int64_t first_end= INT64_MAX;
997
    int64_t oldpos= url_ftell(s->pb);
998

    
999
    for(i=0; i<s->nb_streams; i++){
1000
        AVStream *st = s->streams[i];
1001
        int n= st->nb_index_entries;
1002
        unsigned int size;
1003

    
1004
        if(n <= 0)
1005
            continue;
1006

    
1007
        if(n >= 2){
1008
            int64_t pos= st->index_entries[0].pos;
1009
            url_fseek(s->pb, pos + 4, SEEK_SET);
1010
            size= get_le32(s->pb);
1011
            if(pos + size > st->index_entries[1].pos)
1012
                last_start= INT64_MAX;
1013
        }
1014

    
1015
        if(st->index_entries[0].pos > last_start)
1016
            last_start= st->index_entries[0].pos;
1017
        if(st->index_entries[n-1].pos < first_end)
1018
            first_end= st->index_entries[n-1].pos;
1019
    }
1020
    url_fseek(s->pb, oldpos, SEEK_SET);
1021
    return last_start > first_end;
1022
}
1023

    
1024
static int avi_load_index(AVFormatContext *s)
1025
{
1026
    AVIContext *avi = s->priv_data;
1027
    ByteIOContext *pb = s->pb;
1028
    uint32_t tag, size;
1029
    int64_t pos= url_ftell(pb);
1030
    int ret = -1;
1031

    
1032
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1033
        goto the_end; // maybe truncated file
1034
#ifdef DEBUG_SEEK
1035
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1036
#endif
1037
    for(;;) {
1038
        if (url_feof(pb))
1039
            break;
1040
        tag = get_le32(pb);
1041
        size = get_le32(pb);
1042
#ifdef DEBUG_SEEK
1043
        printf("tag=%c%c%c%c size=0x%x\n",
1044
               tag & 0xff,
1045
               (tag >> 8) & 0xff,
1046
               (tag >> 16) & 0xff,
1047
               (tag >> 24) & 0xff,
1048
               size);
1049
#endif
1050
        switch(tag) {
1051
        case MKTAG('i', 'd', 'x', '1'):
1052
            if (avi_read_idx1(s, size) < 0)
1053
                goto skip;
1054
            ret = 0;
1055
                goto the_end;
1056
            break;
1057
        default:
1058
        skip:
1059
            size += (size & 1);
1060
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1061
                goto the_end; // something is wrong here
1062
            break;
1063
        }
1064
    }
1065
 the_end:
1066
    url_fseek(pb, pos, SEEK_SET);
1067
    return ret;
1068
}
1069

    
1070
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1071
{
1072
    AVIContext *avi = s->priv_data;
1073
    AVStream *st;
1074
    int i, index;
1075
    int64_t pos;
1076
    AVIStream *ast;
1077

    
1078
    if (!avi->index_loaded) {
1079
        /* we only load the index on demand */
1080
        avi_load_index(s);
1081
        avi->index_loaded = 1;
1082
    }
1083
    assert(stream_index>= 0);
1084

    
1085
    st = s->streams[stream_index];
1086
    ast= st->priv_data;
1087
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1088
    if(index<0)
1089
        return -1;
1090

    
1091
    /* find the position */
1092
    pos = st->index_entries[index].pos;
1093
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1094

    
1095
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1096

    
1097
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1098
        /* One and only one real stream for DV in AVI, and it has video  */
1099
        /* offsets. Calling with other stream indexes should have failed */
1100
        /* the av_index_search_timestamp call above.                     */
1101
        assert(stream_index == 0);
1102

    
1103
        /* Feed the DV video stream version of the timestamp to the */
1104
        /* DV demux so it can synthesize correct timestamps.        */
1105
        dv_offset_reset(avi->dv_demux, timestamp);
1106

    
1107
        url_fseek(s->pb, pos, SEEK_SET);
1108
        avi->stream_index= -1;
1109
        return 0;
1110
    }
1111

    
1112
    for(i = 0; i < s->nb_streams; i++) {
1113
        AVStream *st2 = s->streams[i];
1114
        AVIStream *ast2 = st2->priv_data;
1115

    
1116
        ast2->packet_size=
1117
        ast2->remaining= 0;
1118

    
1119
        if (st2->nb_index_entries <= 0)
1120
            continue;
1121

    
1122
//        assert(st2->codec->block_align);
1123
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1124
        index = av_index_search_timestamp(
1125
                st2,
1126
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1127
                flags | AVSEEK_FLAG_BACKWARD);
1128
        if(index<0)
1129
            index=0;
1130

    
1131
        if(!avi->non_interleaved){
1132
            while(index>0 && st2->index_entries[index].pos > pos)
1133
                index--;
1134
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1135
                index++;
1136
        }
1137

    
1138
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1139
        /* extract the current frame number */
1140
        ast2->frame_offset = st2->index_entries[index].timestamp;
1141
    }
1142

    
1143
    /* do the seek */
1144
    url_fseek(s->pb, pos, SEEK_SET);
1145
    avi->stream_index= -1;
1146
    return 0;
1147
}
1148

    
1149
static int avi_read_close(AVFormatContext *s)
1150
{
1151
    int i;
1152
    AVIContext *avi = s->priv_data;
1153

    
1154
    for(i=0;i<s->nb_streams;i++) {
1155
        AVStream *st = s->streams[i];
1156
        av_free(st->codec->palctrl);
1157
    }
1158

    
1159
    if (avi->dv_demux)
1160
        av_free(avi->dv_demux);
1161

    
1162
    return 0;
1163
}
1164

    
1165
static int avi_probe(AVProbeData *p)
1166
{
1167
    int i;
1168

    
1169
    /* check file header */
1170
    for(i=0; avi_headers[i][0]; i++)
1171
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1172
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1173
            return AVPROBE_SCORE_MAX;
1174

    
1175
    return 0;
1176
}
1177

    
1178
AVInputFormat avi_demuxer = {
1179
    "avi",
1180
    NULL_IF_CONFIG_SMALL("AVI format"),
1181
    sizeof(AVIContext),
1182
    avi_probe,
1183
    avi_read_header,
1184
    avi_read_packet,
1185
    avi_read_close,
1186
    avi_read_seek,
1187
    .metadata_conv = ff_avi_metadata_conv,
1188
};