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ffmpeg / libavformat / avidec.c @ 0941ee0f

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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, const char *key, unsigned int size)
231
{
232
    ByteIOContext *pb = s->pb;
233
    char *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_strz(pb, value, size);
243

    
244
    return av_metadata_set2(&s->metadata, key, value,
245
                                  AV_METADATA_DONT_STRDUP_VAL);
246
}
247

    
248
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
249
{
250
    AVIContext *avi = s->priv_data;
251
    ByteIOContext *pb = s->pb;
252
    unsigned int tag, tag1, handler;
253
    int codec_type, stream_index, frame_period, bit_rate;
254
    unsigned int size, nb_frames;
255
    int i;
256
    AVStream *st;
257
    AVIStream *ast = NULL;
258
    int avih_width=0, avih_height=0;
259
    int amv_file_format=0;
260
    uint64_t list_end = 0;
261

    
262
    avi->stream_index= -1;
263

    
264
    if (get_riff(s, pb) < 0)
265
        return -1;
266

    
267
    avi->fsize = url_fsize(pb);
268
    if(avi->fsize<=0)
269
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
270

    
271
    /* first list tag */
272
    stream_index = -1;
273
    codec_type = -1;
274
    frame_period = 0;
275
    for(;;) {
276
        if (url_feof(pb))
277
            goto fail;
278
        tag = get_le32(pb);
279
        size = get_le32(pb);
280
#ifdef DEBUG
281
        print_tag("tag", tag, size);
282
#endif
283

    
284
        switch(tag) {
285
        case MKTAG('L', 'I', 'S', 'T'):
286
            list_end = url_ftell(pb) + size;
287
            /* Ignored, except at start of video packets. */
288
            tag1 = get_le32(pb);
289
#ifdef DEBUG
290
            print_tag("list", tag1, 0);
291
#endif
292
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
293
                avi->movi_list = url_ftell(pb) - 4;
294
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
295
                else     avi->movi_end = url_fsize(pb);
296
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
297
                goto end_of_header;
298
            }
299
            break;
300
        case MKTAG('d', 'm', 'l', 'h'):
301
            avi->is_odml = 1;
302
            url_fskip(pb, size + (size & 1));
303
            break;
304
        case MKTAG('a', 'm', 'v', 'h'):
305
            amv_file_format=1;
306
        case MKTAG('a', 'v', 'i', 'h'):
307
            /* AVI header */
308
            /* using frame_period is bad idea */
309
            frame_period = get_le32(pb);
310
            bit_rate = get_le32(pb) * 8;
311
            get_le32(pb);
312
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
313

    
314
            url_fskip(pb, 2 * 4);
315
            get_le32(pb);
316
            get_le32(pb);
317
            avih_width=get_le32(pb);
318
            avih_height=get_le32(pb);
319

    
320
            url_fskip(pb, size - 10 * 4);
321
            break;
322
        case MKTAG('s', 't', 'r', 'h'):
323
            /* stream header */
324

    
325
            tag1 = get_le32(pb);
326
            handler = get_le32(pb); /* codec tag */
327

    
328
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
329
                url_fskip(pb, size - 8);
330
                break;
331
            }else{
332
                stream_index++;
333
                st = av_new_stream(s, stream_index);
334
                if (!st)
335
                    goto fail;
336

    
337
                ast = av_mallocz(sizeof(AVIStream));
338
                if (!ast)
339
                    goto fail;
340
                st->priv_data = ast;
341
            }
342
            if(amv_file_format)
343
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
344

    
345
#ifdef DEBUG
346
            print_tag("strh", tag1, -1);
347
#endif
348
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
349
                int64_t dv_dur;
350

    
351
                /*
352
                 * After some consideration -- I don't think we
353
                 * have to support anything but DV in type1 AVIs.
354
                 */
355
                if (s->nb_streams != 1)
356
                    goto fail;
357

    
358
                if (handler != MKTAG('d', 'v', 's', 'd') &&
359
                    handler != MKTAG('d', 'v', 'h', 'd') &&
360
                    handler != MKTAG('d', 'v', 's', 'l'))
361
                   goto fail;
362

    
363
                ast = s->streams[0]->priv_data;
364
                av_freep(&s->streams[0]->codec->extradata);
365
                av_freep(&s->streams[0]);
366
                s->nb_streams = 0;
367
                if (CONFIG_DV_DEMUXER) {
368
                    avi->dv_demux = dv_init_demux(s);
369
                    if (!avi->dv_demux)
370
                        goto fail;
371
                }
372
                s->streams[0]->priv_data = ast;
373
                url_fskip(pb, 3 * 4);
374
                ast->scale = get_le32(pb);
375
                ast->rate = get_le32(pb);
376
                url_fskip(pb, 4);  /* start time */
377

    
378
                dv_dur = get_le32(pb);
379
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
380
                    dv_dur *= AV_TIME_BASE;
381
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
382
                }
383
                /*
384
                 * else, leave duration alone; timing estimation in utils.c
385
                 *      will make a guess based on bitrate.
386
                 */
387

    
388
                stream_index = s->nb_streams - 1;
389
                url_fskip(pb, size - 9*4);
390
                break;
391
            }
392

    
393
            assert(stream_index < s->nb_streams);
394
            st->codec->stream_codec_tag= handler;
395

    
396
            get_le32(pb); /* flags */
397
            get_le16(pb); /* priority */
398
            get_le16(pb); /* language */
399
            get_le32(pb); /* initial frame */
400
            ast->scale = get_le32(pb);
401
            ast->rate = get_le32(pb);
402
            if(!(ast->scale && ast->rate)){
403
                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);
404
                if(frame_period){
405
                    ast->rate = 1000000;
406
                    ast->scale = frame_period;
407
                }else{
408
                    ast->rate = 25;
409
                    ast->scale = 1;
410
                }
411
            }
412
            av_set_pts_info(st, 64, ast->scale, ast->rate);
413

    
414
            ast->cum_len=get_le32(pb); /* start */
415
            nb_frames = get_le32(pb);
416

    
417
            st->start_time = 0;
418
            st->duration = nb_frames;
419
            get_le32(pb); /* buffer size */
420
            get_le32(pb); /* quality */
421
            ast->sample_size = get_le32(pb); /* sample ssize */
422
            ast->cum_len *= FFMAX(1, ast->sample_size);
423
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
424

    
425
            switch(tag1) {
426
            case MKTAG('v', 'i', 'd', 's'):
427
                codec_type = CODEC_TYPE_VIDEO;
428

    
429
                ast->sample_size = 0;
430
                break;
431
            case MKTAG('a', 'u', 'd', 's'):
432
                codec_type = CODEC_TYPE_AUDIO;
433
                break;
434
            case MKTAG('t', 'x', 't', 's'):
435
                //FIXME
436
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
437
                break;
438
            case MKTAG('d', 'a', 't', 's'):
439
                codec_type = CODEC_TYPE_DATA;
440
                break;
441
            default:
442
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
443
                goto fail;
444
            }
445
            ast->frame_offset= ast->cum_len;
446
            url_fskip(pb, size - 12 * 4);
447
            break;
448
        case MKTAG('s', 't', 'r', 'f'):
449
            /* stream header */
450
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
451
                url_fskip(pb, size);
452
            } else {
453
                uint64_t cur_pos = url_ftell(pb);
454
                if (cur_pos < list_end)
455
                    size = FFMIN(size, list_end - cur_pos);
456
                st = s->streams[stream_index];
457
                switch(codec_type) {
458
                case CODEC_TYPE_VIDEO:
459
                    if(amv_file_format){
460
                        st->codec->width=avih_width;
461
                        st->codec->height=avih_height;
462
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
463
                        st->codec->codec_id = CODEC_ID_AMV;
464
                        url_fskip(pb, size);
465
                        break;
466
                    }
467
                    get_le32(pb); /* size */
468
                    st->codec->width = get_le32(pb);
469
                    st->codec->height = (int32_t)get_le32(pb);
470
                    get_le16(pb); /* panes */
471
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
472
                    tag1 = get_le32(pb);
473
                    get_le32(pb); /* ImageSize */
474
                    get_le32(pb); /* XPelsPerMeter */
475
                    get_le32(pb); /* YPelsPerMeter */
476
                    get_le32(pb); /* ClrUsed */
477
                    get_le32(pb); /* ClrImportant */
478

    
479
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
480
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
481
                        st->codec->codec_tag = tag1;
482
                        st->codec->codec_id = CODEC_ID_XSUB;
483
                        break;
484
                    }
485

    
486
                    if(size > 10*4 && size<(1<<30)){
487
                        st->codec->extradata_size= size - 10*4;
488
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
489
                        if (!st->codec->extradata) {
490
                            st->codec->extradata_size= 0;
491
                            return AVERROR(ENOMEM);
492
                        }
493
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
494
                    }
495

    
496
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
497
                        get_byte(pb);
498

    
499
                    /* Extract palette from extradata if bpp <= 8. */
500
                    /* This code assumes that extradata contains only palette. */
501
                    /* This is true for all paletted codecs implemented in FFmpeg. */
502
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
503
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
504
#if HAVE_BIGENDIAN
505
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
506
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
507
#else
508
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
509
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
510
#endif
511
                        st->codec->palctrl->palette_changed = 1;
512
                    }
513

    
514
#ifdef DEBUG
515
                    print_tag("video", tag1, 0);
516
#endif
517
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
518
                    st->codec->codec_tag = tag1;
519
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
520
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
521
                    // Support "Resolution 1:1" for Avid AVI Codec
522
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
523
                       st->codec->extradata_size >= 31 &&
524
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
525
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
526

    
527
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
528
                        st->codec->extradata_size+= 9;
529
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
530
                        if(st->codec->extradata)
531
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
532
                    }
533
                    st->codec->height= FFABS(st->codec->height);
534

    
535
//                    url_fskip(pb, size - 5 * 4);
536
                    break;
537
                case CODEC_TYPE_AUDIO:
538
                    ff_get_wav_header(pb, st->codec, size);
539
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
540
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
541
                        ast->sample_size= st->codec->block_align;
542
                    }
543
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
544
                        url_fskip(pb, 1);
545
                    /* Force parsing as several audio frames can be in
546
                     * one packet and timestamps refer to packet start. */
547
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
548
                    /* ADTS header is in extradata, AAC without header must be
549
                     * stored as exact frames. Parser not needed and it will
550
                     * fail. */
551
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
552
                        st->need_parsing = AVSTREAM_PARSE_NONE;
553
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
554
                     * audio in the header but have Axan as stream_code_tag. */
555
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
556
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
557
                        st->codec->codec_tag = 0;
558
                    }
559
                    if (amv_file_format)
560
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
561
                    break;
562
                default:
563
                    st->codec->codec_type = CODEC_TYPE_DATA;
564
                    st->codec->codec_id= CODEC_ID_NONE;
565
                    st->codec->codec_tag= 0;
566
                    url_fskip(pb, size);
567
                    break;
568
                }
569
            }
570
            break;
571
        case MKTAG('i', 'n', 'd', 'x'):
572
            i= url_ftell(pb);
573
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
574
                read_braindead_odml_indx(s, 0);
575
            }
576
            url_fseek(pb, i+size, SEEK_SET);
577
            break;
578
        case MKTAG('v', 'p', 'r', 'p'):
579
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
580
                AVRational active, active_aspect;
581

    
582
                st = s->streams[stream_index];
583
                get_le32(pb);
584
                get_le32(pb);
585
                get_le32(pb);
586
                get_le32(pb);
587
                get_le32(pb);
588

    
589
                active_aspect.den= get_le16(pb);
590
                active_aspect.num= get_le16(pb);
591
                active.num       = get_le32(pb);
592
                active.den       = get_le32(pb);
593
                get_le32(pb); //nbFieldsPerFrame
594

    
595
                if(active_aspect.num && active_aspect.den && active.num && active.den){
596
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
597
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
598
                }
599
                size -= 9*4;
600
            }
601
            url_fseek(pb, size, SEEK_CUR);
602
            break;
603
        case MKTAG('I', 'N', 'A', 'M'):
604
            avi_read_tag(s, "Title", size);
605
            break;
606
        case MKTAG('I', 'A', 'R', 'T'):
607
            avi_read_tag(s, "Artist", size);
608
            break;
609
        case MKTAG('I', 'C', 'O', 'P'):
610
            avi_read_tag(s, "Copyright", size);
611
            break;
612
        case MKTAG('I', 'C', 'M', 'T'):
613
            avi_read_tag(s, "Comment", size);
614
            break;
615
        case MKTAG('I', 'G', 'N', 'R'):
616
            avi_read_tag(s, "Genre", size);
617
            break;
618
        case MKTAG('I', 'P', 'R', 'D'):
619
            avi_read_tag(s, "Album", size);
620
            break;
621
        case MKTAG('I', 'P', 'R', 'T'):
622
            avi_read_tag(s, "Track", size);
623
            break;
624
        default:
625
            if(size > 1000000){
626
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
627
                                        "I will ignore it and try to continue anyway.\n");
628
                avi->movi_list = url_ftell(pb) - 4;
629
                avi->movi_end  = url_fsize(pb);
630
                goto end_of_header;
631
            }
632
            /* skip tag */
633
            size += (size & 1);
634
            url_fskip(pb, size);
635
            break;
636
        }
637
    }
638
 end_of_header:
639
    /* check stream number */
640
    if (stream_index != s->nb_streams - 1) {
641
    fail:
642
        return -1;
643
    }
644

    
645
    if(!avi->index_loaded && !url_is_streamed(pb))
646
        avi_load_index(s);
647
    avi->index_loaded = 1;
648
    avi->non_interleaved |= guess_ni_flag(s);
649
    if(avi->non_interleaved) {
650
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
651
        clean_index(s);
652
    }
653

    
654
    return 0;
655
}
656

    
657
static int get_stream_idx(int *d){
658
    if(    d[0] >= '0' && d[0] <= '9'
659
        && d[1] >= '0' && d[1] <= '9'){
660
        return (d[0] - '0') * 10 + (d[1] - '0');
661
    }else{
662
        return 100; //invalid stream ID
663
    }
664
}
665

    
666
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
667
{
668
    AVIContext *avi = s->priv_data;
669
    ByteIOContext *pb = s->pb;
670
    int n, d[8];
671
    unsigned int size;
672
    int64_t i, sync;
673
    void* dstr;
674

    
675
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
676
        int size = dv_get_packet(avi->dv_demux, pkt);
677
        if (size >= 0)
678
            return size;
679
    }
680

    
681
    if(avi->non_interleaved){
682
        int best_stream_index = 0;
683
        AVStream *best_st= NULL;
684
        AVIStream *best_ast;
685
        int64_t best_ts= INT64_MAX;
686
        int i;
687

    
688
        for(i=0; i<s->nb_streams; i++){
689
            AVStream *st = s->streams[i];
690
            AVIStream *ast = st->priv_data;
691
            int64_t ts= ast->frame_offset;
692
            int64_t last_ts;
693

    
694
            if(!st->nb_index_entries)
695
                continue;
696

    
697
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
698
            if(!ast->remaining && ts > last_ts)
699
                continue;
700

    
701
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
702

    
703
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
704
            if(ts < best_ts){
705
                best_ts= ts;
706
                best_st= st;
707
                best_stream_index= i;
708
            }
709
        }
710
        if(!best_st)
711
            return -1;
712

    
713
        best_ast = best_st->priv_data;
714
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
715
        if(best_ast->remaining)
716
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
717
        else{
718
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
719
            if(i>=0)
720
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
721
        }
722

    
723
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
724
        if(i>=0){
725
            int64_t pos= best_st->index_entries[i].pos;
726
            pos += best_ast->packet_size - best_ast->remaining;
727
            url_fseek(s->pb, pos + 8, SEEK_SET);
728
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
729

    
730
            assert(best_ast->remaining <= best_ast->packet_size);
731

    
732
            avi->stream_index= best_stream_index;
733
            if(!best_ast->remaining)
734
                best_ast->packet_size=
735
                best_ast->remaining= best_st->index_entries[i].size;
736
        }
737
    }
738

    
739
resync:
740
    if(avi->stream_index >= 0){
741
        AVStream *st= s->streams[ avi->stream_index ];
742
        AVIStream *ast= st->priv_data;
743
        int size, err;
744

    
745
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
746
            size= INT_MAX;
747
        else if(ast->sample_size < 32)
748
            size= 64*ast->sample_size;
749
        else
750
            size= ast->sample_size;
751

    
752
        if(size > ast->remaining)
753
            size= ast->remaining;
754
        avi->last_pkt_pos= url_ftell(pb);
755
        err= av_get_packet(pb, pkt, size);
756
        if(err<0)
757
            return err;
758

    
759
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
760
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
761
            if(ptr){
762
            ast->has_pal=0;
763
            pkt->size += 4*256;
764
            pkt->data= ptr;
765
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
766
            }else
767
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
768
        }
769

    
770
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
771
            dstr = pkt->destruct;
772
            size = dv_produce_packet(avi->dv_demux, pkt,
773
                                    pkt->data, pkt->size);
774
            pkt->destruct = dstr;
775
            pkt->flags |= PKT_FLAG_KEY;
776
        } else {
777
            /* XXX: How to handle B-frames in AVI? */
778
            pkt->dts = ast->frame_offset;
779
//                pkt->dts += ast->start;
780
            if(ast->sample_size)
781
                pkt->dts /= ast->sample_size;
782
//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);
783
            pkt->stream_index = avi->stream_index;
784

    
785
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
786
                AVIndexEntry *e;
787
                int index;
788
                assert(st->index_entries);
789

    
790
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
791
                e= &st->index_entries[index];
792

    
793
                if(index >= 0 && e->timestamp == ast->frame_offset){
794
                    if (e->flags & AVINDEX_KEYFRAME)
795
                        pkt->flags |= PKT_FLAG_KEY;
796
                }
797
            } else {
798
                pkt->flags |= PKT_FLAG_KEY;
799
            }
800
            if(ast->sample_size)
801
                ast->frame_offset += pkt->size;
802
            else
803
                ast->frame_offset++;
804
        }
805
        ast->remaining -= size;
806
        if(!ast->remaining){
807
            avi->stream_index= -1;
808
            ast->packet_size= 0;
809
        }
810

    
811
        return size;
812
    }
813

    
814
    memset(d, -1, sizeof(int)*8);
815
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
816
        int j;
817

    
818
        for(j=0; j<7; j++)
819
            d[j]= d[j+1];
820
        d[7]= get_byte(pb);
821

    
822
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
823

    
824
        n= get_stream_idx(d+2);
825
//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);
826
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
827
            continue;
828

    
829
        //parse ix##
830
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
831
        //parse JUNK
832
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
833
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
834
            url_fskip(pb, size);
835
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
836
            goto resync;
837
        }
838

    
839
        //parse stray LIST
840
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
841
            url_fskip(pb, 4);
842
            goto resync;
843
        }
844

    
845
        n= get_stream_idx(d);
846

    
847
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
848
            continue;
849

    
850
        //detect ##ix chunk and skip
851
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
852
            url_fskip(pb, size);
853
            goto resync;
854
        }
855

    
856
        //parse ##dc/##wb
857
        if(n < s->nb_streams){
858
            AVStream *st;
859
            AVIStream *ast;
860
            st = s->streams[n];
861
            ast = st->priv_data;
862

    
863
            if(s->nb_streams>=2){
864
                AVStream *st1  = s->streams[1];
865
                AVIStream *ast1= st1->priv_data;
866
                //workaround for broken small-file-bug402.avi
867
                if(   d[2] == 'w' && d[3] == 'b'
868
                   && n==0
869
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
870
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
871
                   && ast->prefix == 'd'*256+'c'
872
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
873
                  ){
874
                    n=1;
875
                    st = st1;
876
                    ast = ast1;
877
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
878
                }
879
            }
880

    
881

    
882
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
883
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
884
               || st->discard >= AVDISCARD_ALL){
885
                if(ast->sample_size) ast->frame_offset += pkt->size;
886
                else                 ast->frame_offset++;
887
                url_fskip(pb, size);
888
                goto resync;
889
            }
890

    
891
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
892
                int k = get_byte(pb);
893
                int last = (k + get_byte(pb) - 1) & 0xFF;
894

    
895
                get_le16(pb); //flags
896

    
897
                for (; k <= last; k++)
898
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
899
                ast->has_pal= 1;
900
                goto resync;
901
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
902
                         d[2]*256+d[3] == ast->prefix /*||
903
                         (d[2] == 'd' && d[3] == 'c') ||
904
                         (d[2] == 'w' && d[3] == 'b')*/) {
905

    
906
//av_log(s, AV_LOG_DEBUG, "OK\n");
907
                if(d[2]*256+d[3] == ast->prefix)
908
                    ast->prefix_count++;
909
                else{
910
                    ast->prefix= d[2]*256+d[3];
911
                    ast->prefix_count= 0;
912
                }
913

    
914
                avi->stream_index= n;
915
                ast->packet_size= size + 8;
916
                ast->remaining= size;
917

    
918
                if(size || !ast->sample_size){
919
                    uint64_t pos= url_ftell(pb) - 8;
920
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
921
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
922
                    }
923
                }
924
                goto resync;
925
            }
926
        }
927
    }
928

    
929
    return AVERROR_EOF;
930
}
931

    
932
/* XXX: We make the implicit supposition that the positions are sorted
933
   for each stream. */
934
static int avi_read_idx1(AVFormatContext *s, int size)
935
{
936
    AVIContext *avi = s->priv_data;
937
    ByteIOContext *pb = s->pb;
938
    int nb_index_entries, i;
939
    AVStream *st;
940
    AVIStream *ast;
941
    unsigned int index, tag, flags, pos, len;
942
    unsigned last_pos= -1;
943

    
944
    nb_index_entries = size / 16;
945
    if (nb_index_entries <= 0)
946
        return -1;
947

    
948
    /* Read the entries and sort them in each stream component. */
949
    for(i = 0; i < nb_index_entries; i++) {
950
        tag = get_le32(pb);
951
        flags = get_le32(pb);
952
        pos = get_le32(pb);
953
        len = get_le32(pb);
954
#if defined(DEBUG_SEEK)
955
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
956
               i, tag, flags, pos, len);
957
#endif
958
        if(i==0 && pos > avi->movi_list)
959
            avi->movi_list= 0; //FIXME better check
960
        pos += avi->movi_list;
961

    
962
        index = ((tag & 0xff) - '0') * 10;
963
        index += ((tag >> 8) & 0xff) - '0';
964
        if (index >= s->nb_streams)
965
            continue;
966
        st = s->streams[index];
967
        ast = st->priv_data;
968

    
969
#if defined(DEBUG_SEEK)
970
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
971
#endif
972
        if(url_feof(pb))
973
            return -1;
974

    
975
        if(last_pos == pos)
976
            avi->non_interleaved= 1;
977
        else if(len || !ast->sample_size)
978
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
979
        if(ast->sample_size)
980
            ast->cum_len += len;
981
        else
982
            ast->cum_len ++;
983
        last_pos= pos;
984
    }
985
    return 0;
986
}
987

    
988
static int guess_ni_flag(AVFormatContext *s){
989
    int i;
990
    int64_t last_start=0;
991
    int64_t first_end= INT64_MAX;
992
    int64_t oldpos= url_ftell(s->pb);
993

    
994
    for(i=0; i<s->nb_streams; i++){
995
        AVStream *st = s->streams[i];
996
        int n= st->nb_index_entries;
997
        unsigned int size;
998

    
999
        if(n <= 0)
1000
            continue;
1001

    
1002
        if(n >= 2){
1003
            int64_t pos= st->index_entries[0].pos;
1004
            url_fseek(s->pb, pos + 4, SEEK_SET);
1005
            size= get_le32(s->pb);
1006
            if(pos + size > st->index_entries[1].pos)
1007
                last_start= INT64_MAX;
1008
        }
1009

    
1010
        if(st->index_entries[0].pos > last_start)
1011
            last_start= st->index_entries[0].pos;
1012
        if(st->index_entries[n-1].pos < first_end)
1013
            first_end= st->index_entries[n-1].pos;
1014
    }
1015
    url_fseek(s->pb, oldpos, SEEK_SET);
1016
    return last_start > first_end;
1017
}
1018

    
1019
static int avi_load_index(AVFormatContext *s)
1020
{
1021
    AVIContext *avi = s->priv_data;
1022
    ByteIOContext *pb = s->pb;
1023
    uint32_t tag, size;
1024
    int64_t pos= url_ftell(pb);
1025
    int ret = -1;
1026

    
1027
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1028
        goto the_end; // maybe truncated file
1029
#ifdef DEBUG_SEEK
1030
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1031
#endif
1032
    for(;;) {
1033
        if (url_feof(pb))
1034
            break;
1035
        tag = get_le32(pb);
1036
        size = get_le32(pb);
1037
#ifdef DEBUG_SEEK
1038
        printf("tag=%c%c%c%c size=0x%x\n",
1039
               tag & 0xff,
1040
               (tag >> 8) & 0xff,
1041
               (tag >> 16) & 0xff,
1042
               (tag >> 24) & 0xff,
1043
               size);
1044
#endif
1045
        switch(tag) {
1046
        case MKTAG('i', 'd', 'x', '1'):
1047
            if (avi_read_idx1(s, size) < 0)
1048
                goto skip;
1049
            ret = 0;
1050
                goto the_end;
1051
            break;
1052
        default:
1053
        skip:
1054
            size += (size & 1);
1055
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1056
                goto the_end; // something is wrong here
1057
            break;
1058
        }
1059
    }
1060
 the_end:
1061
    url_fseek(pb, pos, SEEK_SET);
1062
    return ret;
1063
}
1064

    
1065
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1066
{
1067
    AVIContext *avi = s->priv_data;
1068
    AVStream *st;
1069
    int i, index;
1070
    int64_t pos;
1071
    AVIStream *ast;
1072

    
1073
    if (!avi->index_loaded) {
1074
        /* we only load the index on demand */
1075
        avi_load_index(s);
1076
        avi->index_loaded = 1;
1077
    }
1078
    assert(stream_index>= 0);
1079

    
1080
    st = s->streams[stream_index];
1081
    ast= st->priv_data;
1082
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1083
    if(index<0)
1084
        return -1;
1085

    
1086
    /* find the position */
1087
    pos = st->index_entries[index].pos;
1088
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1089

    
1090
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1091

    
1092
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1093
        /* One and only one real stream for DV in AVI, and it has video  */
1094
        /* offsets. Calling with other stream indexes should have failed */
1095
        /* the av_index_search_timestamp call above.                     */
1096
        assert(stream_index == 0);
1097

    
1098
        /* Feed the DV video stream version of the timestamp to the */
1099
        /* DV demux so it can synthesize correct timestamps.        */
1100
        dv_offset_reset(avi->dv_demux, timestamp);
1101

    
1102
        url_fseek(s->pb, pos, SEEK_SET);
1103
        avi->stream_index= -1;
1104
        return 0;
1105
    }
1106

    
1107
    for(i = 0; i < s->nb_streams; i++) {
1108
        AVStream *st2 = s->streams[i];
1109
        AVIStream *ast2 = st2->priv_data;
1110

    
1111
        ast2->packet_size=
1112
        ast2->remaining= 0;
1113

    
1114
        if (st2->nb_index_entries <= 0)
1115
            continue;
1116

    
1117
//        assert(st2->codec->block_align);
1118
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1119
        index = av_index_search_timestamp(
1120
                st2,
1121
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1122
                flags | AVSEEK_FLAG_BACKWARD);
1123
        if(index<0)
1124
            index=0;
1125

    
1126
        if(!avi->non_interleaved){
1127
            while(index>0 && st2->index_entries[index].pos > pos)
1128
                index--;
1129
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1130
                index++;
1131
        }
1132

    
1133
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1134
        /* extract the current frame number */
1135
        ast2->frame_offset = st2->index_entries[index].timestamp;
1136
    }
1137

    
1138
    /* do the seek */
1139
    url_fseek(s->pb, pos, SEEK_SET);
1140
    avi->stream_index= -1;
1141
    return 0;
1142
}
1143

    
1144
static int avi_read_close(AVFormatContext *s)
1145
{
1146
    int i;
1147
    AVIContext *avi = s->priv_data;
1148

    
1149
    for(i=0;i<s->nb_streams;i++) {
1150
        AVStream *st = s->streams[i];
1151
        av_free(st->codec->palctrl);
1152
    }
1153

    
1154
    if (avi->dv_demux)
1155
        av_free(avi->dv_demux);
1156

    
1157
    return 0;
1158
}
1159

    
1160
static int avi_probe(AVProbeData *p)
1161
{
1162
    int i;
1163

    
1164
    /* check file header */
1165
    for(i=0; avi_headers[i][0]; i++)
1166
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1167
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1168
            return AVPROBE_SCORE_MAX;
1169

    
1170
    return 0;
1171
}
1172

    
1173
AVInputFormat avi_demuxer = {
1174
    "avi",
1175
    NULL_IF_CONFIG_SMALL("AVI format"),
1176
    sizeof(AVIContext),
1177
    avi_probe,
1178
    avi_read_header,
1179
    avi_read_packet,
1180
    avi_read_close,
1181
    avi_read_seek,
1182
};