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ffmpeg / libavformat / avidec.c @ 7a9af8ec

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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, 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_buffer(pb, value, size);
243
    value[size]=0;
244

    
245
    if(st)
246
        return av_metadata_set2(&st->metadata, key, value,
247
                                    AV_METADATA_DONT_STRDUP_VAL);
248
    else
249
    return av_metadata_set2(&s->metadata, key, value,
250
                                  AV_METADATA_DONT_STRDUP_VAL);
251
}
252

    
253
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
254
{
255
    AVIContext *avi = s->priv_data;
256
    ByteIOContext *pb = s->pb;
257
    unsigned int tag, tag1, handler;
258
    int codec_type, stream_index, frame_period, bit_rate;
259
    unsigned int size;
260
    int i;
261
    AVStream *st;
262
    AVIStream *ast = NULL;
263
    int avih_width=0, avih_height=0;
264
    int amv_file_format=0;
265
    uint64_t list_end = 0;
266

    
267
    avi->stream_index= -1;
268

    
269
    if (get_riff(s, pb) < 0)
270
        return -1;
271

    
272
    avi->fsize = url_fsize(pb);
273
    if(avi->fsize<=0)
274
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
275

    
276
    /* first list tag */
277
    stream_index = -1;
278
    codec_type = -1;
279
    frame_period = 0;
280
    for(;;) {
281
        if (url_feof(pb))
282
            goto fail;
283
        tag = get_le32(pb);
284
        size = get_le32(pb);
285
#ifdef DEBUG
286
        print_tag("tag", tag, size);
287
#endif
288

    
289
        switch(tag) {
290
        case MKTAG('L', 'I', 'S', 'T'):
291
            list_end = url_ftell(pb) + size;
292
            /* Ignored, except at start of video packets. */
293
            tag1 = get_le32(pb);
294
#ifdef DEBUG
295
            print_tag("list", tag1, 0);
296
#endif
297
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
298
                avi->movi_list = url_ftell(pb) - 4;
299
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
300
                else     avi->movi_end = url_fsize(pb);
301
                dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
302
                goto end_of_header;
303
            }
304
            break;
305
        case MKTAG('d', 'm', 'l', 'h'):
306
            avi->is_odml = 1;
307
            url_fskip(pb, size + (size & 1));
308
            break;
309
        case MKTAG('a', 'm', 'v', 'h'):
310
            amv_file_format=1;
311
        case MKTAG('a', 'v', 'i', 'h'):
312
            /* AVI header */
313
            /* using frame_period is bad idea */
314
            frame_period = get_le32(pb);
315
            bit_rate = get_le32(pb) * 8;
316
            get_le32(pb);
317
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
318

    
319
            url_fskip(pb, 2 * 4);
320
            get_le32(pb);
321
            get_le32(pb);
322
            avih_width=get_le32(pb);
323
            avih_height=get_le32(pb);
324

    
325
            url_fskip(pb, size - 10 * 4);
326
            break;
327
        case MKTAG('s', 't', 'r', 'h'):
328
            /* stream header */
329

    
330
            tag1 = get_le32(pb);
331
            handler = get_le32(pb); /* codec tag */
332

    
333
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
334
                url_fskip(pb, size - 8);
335
                break;
336
            }else{
337
                stream_index++;
338
                st = av_new_stream(s, stream_index);
339
                if (!st)
340
                    goto fail;
341

    
342
                ast = av_mallocz(sizeof(AVIStream));
343
                if (!ast)
344
                    goto fail;
345
                st->priv_data = ast;
346
            }
347
            if(amv_file_format)
348
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
349

    
350
#ifdef DEBUG
351
            print_tag("strh", tag1, -1);
352
#endif
353
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
354
                int64_t dv_dur;
355

    
356
                /*
357
                 * After some consideration -- I don't think we
358
                 * have to support anything but DV in type1 AVIs.
359
                 */
360
                if (s->nb_streams != 1)
361
                    goto fail;
362

    
363
                if (handler != MKTAG('d', 'v', 's', 'd') &&
364
                    handler != MKTAG('d', 'v', 'h', 'd') &&
365
                    handler != MKTAG('d', 'v', 's', 'l'))
366
                   goto fail;
367

    
368
                ast = s->streams[0]->priv_data;
369
                av_freep(&s->streams[0]->codec->extradata);
370
                av_freep(&s->streams[0]);
371
                s->nb_streams = 0;
372
                if (CONFIG_DV_DEMUXER) {
373
                    avi->dv_demux = dv_init_demux(s);
374
                    if (!avi->dv_demux)
375
                        goto fail;
376
                }
377
                s->streams[0]->priv_data = ast;
378
                url_fskip(pb, 3 * 4);
379
                ast->scale = get_le32(pb);
380
                ast->rate = get_le32(pb);
381
                url_fskip(pb, 4);  /* start time */
382

    
383
                dv_dur = get_le32(pb);
384
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
385
                    dv_dur *= AV_TIME_BASE;
386
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
387
                }
388
                /*
389
                 * else, leave duration alone; timing estimation in utils.c
390
                 *      will make a guess based on bitrate.
391
                 */
392

    
393
                stream_index = s->nb_streams - 1;
394
                url_fskip(pb, size - 9*4);
395
                break;
396
            }
397

    
398
            assert(stream_index < s->nb_streams);
399
            st->codec->stream_codec_tag= handler;
400

    
401
            get_le32(pb); /* flags */
402
            get_le16(pb); /* priority */
403
            get_le16(pb); /* language */
404
            get_le32(pb); /* initial frame */
405
            ast->scale = get_le32(pb);
406
            ast->rate = get_le32(pb);
407
            if(!(ast->scale && ast->rate)){
408
                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);
409
                if(frame_period){
410
                    ast->rate = 1000000;
411
                    ast->scale = frame_period;
412
                }else{
413
                    ast->rate = 25;
414
                    ast->scale = 1;
415
                }
416
            }
417
            av_set_pts_info(st, 64, ast->scale, ast->rate);
418

    
419
            ast->cum_len=get_le32(pb); /* start */
420
            st->nb_frames = get_le32(pb);
421

    
422
            st->start_time = 0;
423
            get_le32(pb); /* buffer size */
424
            get_le32(pb); /* quality */
425
            ast->sample_size = get_le32(pb); /* sample ssize */
426
            ast->cum_len *= FFMAX(1, ast->sample_size);
427
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
428

    
429
            switch(tag1) {
430
            case MKTAG('v', 'i', 'd', 's'):
431
                codec_type = CODEC_TYPE_VIDEO;
432

    
433
                ast->sample_size = 0;
434
                break;
435
            case MKTAG('a', 'u', 'd', 's'):
436
                codec_type = CODEC_TYPE_AUDIO;
437
                break;
438
            case MKTAG('t', 'x', 't', 's'):
439
                //FIXME
440
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
441
                break;
442
            case MKTAG('d', 'a', 't', 's'):
443
                codec_type = CODEC_TYPE_DATA;
444
                break;
445
            default:
446
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
447
                goto fail;
448
            }
449
            if(ast->sample_size == 0)
450
                st->duration = st->nb_frames;
451
            ast->frame_offset= ast->cum_len;
452
            url_fskip(pb, size - 12 * 4);
453
            break;
454
        case MKTAG('s', 't', 'r', 'f'):
455
            /* stream header */
456
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
457
                url_fskip(pb, size);
458
            } else {
459
                uint64_t cur_pos = url_ftell(pb);
460
                if (cur_pos < list_end)
461
                    size = FFMIN(size, list_end - cur_pos);
462
                st = s->streams[stream_index];
463
                switch(codec_type) {
464
                case CODEC_TYPE_VIDEO:
465
                    if(amv_file_format){
466
                        st->codec->width=avih_width;
467
                        st->codec->height=avih_height;
468
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
469
                        st->codec->codec_id = CODEC_ID_AMV;
470
                        url_fskip(pb, size);
471
                        break;
472
                    }
473
                    get_le32(pb); /* size */
474
                    st->codec->width = get_le32(pb);
475
                    st->codec->height = (int32_t)get_le32(pb);
476
                    get_le16(pb); /* panes */
477
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
478
                    tag1 = get_le32(pb);
479
                    get_le32(pb); /* ImageSize */
480
                    get_le32(pb); /* XPelsPerMeter */
481
                    get_le32(pb); /* YPelsPerMeter */
482
                    get_le32(pb); /* ClrUsed */
483
                    get_le32(pb); /* ClrImportant */
484

    
485
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
486
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
487
                        st->codec->codec_tag = tag1;
488
                        st->codec->codec_id = CODEC_ID_XSUB;
489
                        break;
490
                    }
491

    
492
                    if(size > 10*4 && size<(1<<30)){
493
                        st->codec->extradata_size= size - 10*4;
494
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
495
                        if (!st->codec->extradata) {
496
                            st->codec->extradata_size= 0;
497
                            return AVERROR(ENOMEM);
498
                        }
499
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
500
                    }
501

    
502
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
503
                        get_byte(pb);
504

    
505
                    /* Extract palette from extradata if bpp <= 8. */
506
                    /* This code assumes that extradata contains only palette. */
507
                    /* This is true for all paletted codecs implemented in FFmpeg. */
508
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
509
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
510
#if HAVE_BIGENDIAN
511
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
512
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
513
#else
514
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
515
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
516
#endif
517
                        st->codec->palctrl->palette_changed = 1;
518
                    }
519

    
520
#ifdef DEBUG
521
                    print_tag("video", tag1, 0);
522
#endif
523
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
524
                    st->codec->codec_tag = tag1;
525
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
526
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
527
                    // Support "Resolution 1:1" for Avid AVI Codec
528
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
529
                       st->codec->extradata_size >= 31 &&
530
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
531
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
532

    
533
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
534
                        st->codec->extradata_size+= 9;
535
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
536
                        if(st->codec->extradata)
537
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
538
                    }
539
                    st->codec->height= FFABS(st->codec->height);
540

    
541
//                    url_fskip(pb, size - 5 * 4);
542
                    break;
543
                case CODEC_TYPE_AUDIO:
544
                    ff_get_wav_header(pb, st->codec, size);
545
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
546
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
547
                        ast->sample_size= st->codec->block_align;
548
                    }
549
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
550
                        url_fskip(pb, 1);
551
                    /* Force parsing as several audio frames can be in
552
                     * one packet and timestamps refer to packet start. */
553
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
554
                    /* ADTS header is in extradata, AAC without header must be
555
                     * stored as exact frames. Parser not needed and it will
556
                     * fail. */
557
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
558
                        st->need_parsing = AVSTREAM_PARSE_NONE;
559
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
560
                     * audio in the header but have Axan as stream_code_tag. */
561
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
562
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
563
                        st->codec->codec_tag = 0;
564
                    }
565
                    if (amv_file_format)
566
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
567
                    break;
568
                default:
569
                    st->codec->codec_type = CODEC_TYPE_DATA;
570
                    st->codec->codec_id= CODEC_ID_NONE;
571
                    st->codec->codec_tag= 0;
572
                    url_fskip(pb, size);
573
                    break;
574
                }
575
            }
576
            break;
577
        case MKTAG('i', 'n', 'd', 'x'):
578
            i= url_ftell(pb);
579
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
580
                read_braindead_odml_indx(s, 0);
581
            }
582
            url_fseek(pb, i+size, SEEK_SET);
583
            break;
584
        case MKTAG('v', 'p', 'r', 'p'):
585
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
586
                AVRational active, active_aspect;
587

    
588
                st = s->streams[stream_index];
589
                get_le32(pb);
590
                get_le32(pb);
591
                get_le32(pb);
592
                get_le32(pb);
593
                get_le32(pb);
594

    
595
                active_aspect.den= get_le16(pb);
596
                active_aspect.num= get_le16(pb);
597
                active.num       = get_le32(pb);
598
                active.den       = get_le32(pb);
599
                get_le32(pb); //nbFieldsPerFrame
600

    
601
                if(active_aspect.num && active_aspect.den && active.num && active.den){
602
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
603
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
604
                }
605
                size -= 9*4;
606
            }
607
            url_fseek(pb, size, SEEK_CUR);
608
            break;
609
        case MKTAG('I', 'N', 'A', 'M'):
610
            avi_read_tag(s, NULL, "Title", size);
611
            break;
612
        case MKTAG('I', 'A', 'R', 'T'):
613
            avi_read_tag(s, NULL, "Artist", size);
614
            break;
615
        case MKTAG('I', 'C', 'O', 'P'):
616
            avi_read_tag(s, NULL, "Copyright", size);
617
            break;
618
        case MKTAG('I', 'C', 'M', 'T'):
619
            avi_read_tag(s, NULL, "Comment", size);
620
            break;
621
        case MKTAG('I', 'G', 'N', 'R'):
622
            avi_read_tag(s, NULL, "Genre", size);
623
            break;
624
        case MKTAG('I', 'P', 'R', 'D'):
625
            avi_read_tag(s, NULL, "Album", size);
626
            break;
627
        case MKTAG('I', 'P', 'R', 'T'):
628
            avi_read_tag(s, NULL, "Track", size);
629
            break;
630
        case MKTAG('s', 't', 'r', 'n'):
631
            if(s->nb_streams){
632
                avi_read_tag(s, s->streams[s->nb_streams-1], "Title", size);
633
                break;
634
            }
635
        default:
636
            if(size > 1000000){
637
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
638
                                        "I will ignore it and try to continue anyway.\n");
639
                avi->movi_list = url_ftell(pb) - 4;
640
                avi->movi_end  = url_fsize(pb);
641
                goto end_of_header;
642
            }
643
            /* skip tag */
644
            size += (size & 1);
645
            url_fskip(pb, size);
646
            break;
647
        }
648
    }
649
 end_of_header:
650
    /* check stream number */
651
    if (stream_index != s->nb_streams - 1) {
652
    fail:
653
        return -1;
654
    }
655

    
656
    if(!avi->index_loaded && !url_is_streamed(pb))
657
        avi_load_index(s);
658
    avi->index_loaded = 1;
659
    avi->non_interleaved |= guess_ni_flag(s);
660
    if(avi->non_interleaved) {
661
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
662
        clean_index(s);
663
    }
664

    
665
    return 0;
666
}
667

    
668
static int get_stream_idx(int *d){
669
    if(    d[0] >= '0' && d[0] <= '9'
670
        && d[1] >= '0' && d[1] <= '9'){
671
        return (d[0] - '0') * 10 + (d[1] - '0');
672
    }else{
673
        return 100; //invalid stream ID
674
    }
675
}
676

    
677
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
678
{
679
    AVIContext *avi = s->priv_data;
680
    ByteIOContext *pb = s->pb;
681
    int n, d[8];
682
    unsigned int size;
683
    int64_t i, sync;
684
    void* dstr;
685

    
686
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
687
        int size = dv_get_packet(avi->dv_demux, pkt);
688
        if (size >= 0)
689
            return size;
690
    }
691

    
692
    if(avi->non_interleaved){
693
        int best_stream_index = 0;
694
        AVStream *best_st= NULL;
695
        AVIStream *best_ast;
696
        int64_t best_ts= INT64_MAX;
697
        int i;
698

    
699
        for(i=0; i<s->nb_streams; i++){
700
            AVStream *st = s->streams[i];
701
            AVIStream *ast = st->priv_data;
702
            int64_t ts= ast->frame_offset;
703
            int64_t last_ts;
704

    
705
            if(!st->nb_index_entries)
706
                continue;
707

    
708
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
709
            if(!ast->remaining && ts > last_ts)
710
                continue;
711

    
712
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
713

    
714
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
715
            if(ts < best_ts){
716
                best_ts= ts;
717
                best_st= st;
718
                best_stream_index= i;
719
            }
720
        }
721
        if(!best_st)
722
            return -1;
723

    
724
        best_ast = best_st->priv_data;
725
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
726
        if(best_ast->remaining)
727
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
728
        else{
729
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
730
            if(i>=0)
731
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
732
        }
733

    
734
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
735
        if(i>=0){
736
            int64_t pos= best_st->index_entries[i].pos;
737
            pos += best_ast->packet_size - best_ast->remaining;
738
            url_fseek(s->pb, pos + 8, SEEK_SET);
739
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
740

    
741
            assert(best_ast->remaining <= best_ast->packet_size);
742

    
743
            avi->stream_index= best_stream_index;
744
            if(!best_ast->remaining)
745
                best_ast->packet_size=
746
                best_ast->remaining= best_st->index_entries[i].size;
747
        }
748
    }
749

    
750
resync:
751
    if(avi->stream_index >= 0){
752
        AVStream *st= s->streams[ avi->stream_index ];
753
        AVIStream *ast= st->priv_data;
754
        int size, err;
755

    
756
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
757
            size= INT_MAX;
758
        else if(ast->sample_size < 32)
759
            size= 64*ast->sample_size;
760
        else
761
            size= ast->sample_size;
762

    
763
        if(size > ast->remaining)
764
            size= ast->remaining;
765
        avi->last_pkt_pos= url_ftell(pb);
766
        err= av_get_packet(pb, pkt, size);
767
        if(err<0)
768
            return err;
769

    
770
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
771
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
772
            if(ptr){
773
            ast->has_pal=0;
774
            pkt->size += 4*256;
775
            pkt->data= ptr;
776
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
777
            }else
778
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
779
        }
780

    
781
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
782
            dstr = pkt->destruct;
783
            size = dv_produce_packet(avi->dv_demux, pkt,
784
                                    pkt->data, pkt->size);
785
            pkt->destruct = dstr;
786
            pkt->flags |= PKT_FLAG_KEY;
787
        } else {
788
            /* XXX: How to handle B-frames in AVI? */
789
            pkt->dts = ast->frame_offset;
790
//                pkt->dts += ast->start;
791
            if(ast->sample_size)
792
                pkt->dts /= ast->sample_size;
793
//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);
794
            pkt->stream_index = avi->stream_index;
795

    
796
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
797
                AVIndexEntry *e;
798
                int index;
799
                assert(st->index_entries);
800

    
801
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
802
                e= &st->index_entries[index];
803

    
804
                if(index >= 0 && e->timestamp == ast->frame_offset){
805
                    if (e->flags & AVINDEX_KEYFRAME)
806
                        pkt->flags |= PKT_FLAG_KEY;
807
                }
808
            } else {
809
                pkt->flags |= PKT_FLAG_KEY;
810
            }
811
            if(ast->sample_size)
812
                ast->frame_offset += pkt->size;
813
            else
814
                ast->frame_offset++;
815
        }
816
        ast->remaining -= size;
817
        if(!ast->remaining){
818
            avi->stream_index= -1;
819
            ast->packet_size= 0;
820
        }
821

    
822
        return size;
823
    }
824

    
825
    memset(d, -1, sizeof(int)*8);
826
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
827
        int j;
828

    
829
        for(j=0; j<7; j++)
830
            d[j]= d[j+1];
831
        d[7]= get_byte(pb);
832

    
833
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
834

    
835
        n= get_stream_idx(d+2);
836
//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);
837
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
838
            continue;
839

    
840
        //parse ix##
841
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
842
        //parse JUNK
843
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
844
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
845
            url_fskip(pb, size);
846
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
847
            goto resync;
848
        }
849

    
850
        //parse stray LIST
851
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
852
            url_fskip(pb, 4);
853
            goto resync;
854
        }
855

    
856
        n= get_stream_idx(d);
857

    
858
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
859
            continue;
860

    
861
        //detect ##ix chunk and skip
862
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
863
            url_fskip(pb, size);
864
            goto resync;
865
        }
866

    
867
        //parse ##dc/##wb
868
        if(n < s->nb_streams){
869
            AVStream *st;
870
            AVIStream *ast;
871
            st = s->streams[n];
872
            ast = st->priv_data;
873

    
874
            if(s->nb_streams>=2){
875
                AVStream *st1  = s->streams[1];
876
                AVIStream *ast1= st1->priv_data;
877
                //workaround for broken small-file-bug402.avi
878
                if(   d[2] == 'w' && d[3] == 'b'
879
                   && n==0
880
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
881
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
882
                   && ast->prefix == 'd'*256+'c'
883
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
884
                  ){
885
                    n=1;
886
                    st = st1;
887
                    ast = ast1;
888
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
889
                }
890
            }
891

    
892

    
893
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
894
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
895
               || st->discard >= AVDISCARD_ALL){
896
                if(ast->sample_size) ast->frame_offset += pkt->size;
897
                else                 ast->frame_offset++;
898
                url_fskip(pb, size);
899
                goto resync;
900
            }
901

    
902
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
903
                int k = get_byte(pb);
904
                int last = (k + get_byte(pb) - 1) & 0xFF;
905

    
906
                get_le16(pb); //flags
907

    
908
                for (; k <= last; k++)
909
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
910
                ast->has_pal= 1;
911
                goto resync;
912
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
913
                         d[2]*256+d[3] == ast->prefix /*||
914
                         (d[2] == 'd' && d[3] == 'c') ||
915
                         (d[2] == 'w' && d[3] == 'b')*/) {
916

    
917
//av_log(s, AV_LOG_DEBUG, "OK\n");
918
                if(d[2]*256+d[3] == ast->prefix)
919
                    ast->prefix_count++;
920
                else{
921
                    ast->prefix= d[2]*256+d[3];
922
                    ast->prefix_count= 0;
923
                }
924

    
925
                avi->stream_index= n;
926
                ast->packet_size= size + 8;
927
                ast->remaining= size;
928

    
929
                if(size || !ast->sample_size){
930
                    uint64_t pos= url_ftell(pb) - 8;
931
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
932
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
933
                    }
934
                }
935
                goto resync;
936
            }
937
        }
938
    }
939

    
940
    return AVERROR_EOF;
941
}
942

    
943
/* XXX: We make the implicit supposition that the positions are sorted
944
   for each stream. */
945
static int avi_read_idx1(AVFormatContext *s, int size)
946
{
947
    AVIContext *avi = s->priv_data;
948
    ByteIOContext *pb = s->pb;
949
    int nb_index_entries, i;
950
    AVStream *st;
951
    AVIStream *ast;
952
    unsigned int index, tag, flags, pos, len;
953
    unsigned last_pos= -1;
954

    
955
    nb_index_entries = size / 16;
956
    if (nb_index_entries <= 0)
957
        return -1;
958

    
959
    /* Read the entries and sort them in each stream component. */
960
    for(i = 0; i < nb_index_entries; i++) {
961
        tag = get_le32(pb);
962
        flags = get_le32(pb);
963
        pos = get_le32(pb);
964
        len = get_le32(pb);
965
#if defined(DEBUG_SEEK)
966
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
967
               i, tag, flags, pos, len);
968
#endif
969
        if(i==0 && pos > avi->movi_list)
970
            avi->movi_list= 0; //FIXME better check
971
        pos += avi->movi_list;
972

    
973
        index = ((tag & 0xff) - '0') * 10;
974
        index += ((tag >> 8) & 0xff) - '0';
975
        if (index >= s->nb_streams)
976
            continue;
977
        st = s->streams[index];
978
        ast = st->priv_data;
979

    
980
#if defined(DEBUG_SEEK)
981
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
982
#endif
983
        if(url_feof(pb))
984
            return -1;
985

    
986
        if(last_pos == pos)
987
            avi->non_interleaved= 1;
988
        else if(len || !ast->sample_size)
989
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
990
        if(ast->sample_size)
991
            ast->cum_len += len;
992
        else
993
            ast->cum_len ++;
994
        last_pos= pos;
995
    }
996
    return 0;
997
}
998

    
999
static int guess_ni_flag(AVFormatContext *s){
1000
    int i;
1001
    int64_t last_start=0;
1002
    int64_t first_end= INT64_MAX;
1003
    int64_t oldpos= url_ftell(s->pb);
1004

    
1005
    for(i=0; i<s->nb_streams; i++){
1006
        AVStream *st = s->streams[i];
1007
        int n= st->nb_index_entries;
1008
        unsigned int size;
1009

    
1010
        if(n <= 0)
1011
            continue;
1012

    
1013
        if(n >= 2){
1014
            int64_t pos= st->index_entries[0].pos;
1015
            url_fseek(s->pb, pos + 4, SEEK_SET);
1016
            size= get_le32(s->pb);
1017
            if(pos + size > st->index_entries[1].pos)
1018
                last_start= INT64_MAX;
1019
        }
1020

    
1021
        if(st->index_entries[0].pos > last_start)
1022
            last_start= st->index_entries[0].pos;
1023
        if(st->index_entries[n-1].pos < first_end)
1024
            first_end= st->index_entries[n-1].pos;
1025
    }
1026
    url_fseek(s->pb, oldpos, SEEK_SET);
1027
    return last_start > first_end;
1028
}
1029

    
1030
static int avi_load_index(AVFormatContext *s)
1031
{
1032
    AVIContext *avi = s->priv_data;
1033
    ByteIOContext *pb = s->pb;
1034
    uint32_t tag, size;
1035
    int64_t pos= url_ftell(pb);
1036
    int ret = -1;
1037

    
1038
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1039
        goto the_end; // maybe truncated file
1040
#ifdef DEBUG_SEEK
1041
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1042
#endif
1043
    for(;;) {
1044
        if (url_feof(pb))
1045
            break;
1046
        tag = get_le32(pb);
1047
        size = get_le32(pb);
1048
#ifdef DEBUG_SEEK
1049
        printf("tag=%c%c%c%c size=0x%x\n",
1050
               tag & 0xff,
1051
               (tag >> 8) & 0xff,
1052
               (tag >> 16) & 0xff,
1053
               (tag >> 24) & 0xff,
1054
               size);
1055
#endif
1056
        switch(tag) {
1057
        case MKTAG('i', 'd', 'x', '1'):
1058
            if (avi_read_idx1(s, size) < 0)
1059
                goto skip;
1060
            ret = 0;
1061
                goto the_end;
1062
            break;
1063
        default:
1064
        skip:
1065
            size += (size & 1);
1066
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1067
                goto the_end; // something is wrong here
1068
            break;
1069
        }
1070
    }
1071
 the_end:
1072
    url_fseek(pb, pos, SEEK_SET);
1073
    return ret;
1074
}
1075

    
1076
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1077
{
1078
    AVIContext *avi = s->priv_data;
1079
    AVStream *st;
1080
    int i, index;
1081
    int64_t pos;
1082
    AVIStream *ast;
1083

    
1084
    if (!avi->index_loaded) {
1085
        /* we only load the index on demand */
1086
        avi_load_index(s);
1087
        avi->index_loaded = 1;
1088
    }
1089
    assert(stream_index>= 0);
1090

    
1091
    st = s->streams[stream_index];
1092
    ast= st->priv_data;
1093
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1094
    if(index<0)
1095
        return -1;
1096

    
1097
    /* find the position */
1098
    pos = st->index_entries[index].pos;
1099
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1100

    
1101
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1102

    
1103
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1104
        /* One and only one real stream for DV in AVI, and it has video  */
1105
        /* offsets. Calling with other stream indexes should have failed */
1106
        /* the av_index_search_timestamp call above.                     */
1107
        assert(stream_index == 0);
1108

    
1109
        /* Feed the DV video stream version of the timestamp to the */
1110
        /* DV demux so it can synthesize correct timestamps.        */
1111
        dv_offset_reset(avi->dv_demux, timestamp);
1112

    
1113
        url_fseek(s->pb, pos, SEEK_SET);
1114
        avi->stream_index= -1;
1115
        return 0;
1116
    }
1117

    
1118
    for(i = 0; i < s->nb_streams; i++) {
1119
        AVStream *st2 = s->streams[i];
1120
        AVIStream *ast2 = st2->priv_data;
1121

    
1122
        ast2->packet_size=
1123
        ast2->remaining= 0;
1124

    
1125
        if (st2->nb_index_entries <= 0)
1126
            continue;
1127

    
1128
//        assert(st2->codec->block_align);
1129
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1130
        index = av_index_search_timestamp(
1131
                st2,
1132
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1133
                flags | AVSEEK_FLAG_BACKWARD);
1134
        if(index<0)
1135
            index=0;
1136

    
1137
        if(!avi->non_interleaved){
1138
            while(index>0 && st2->index_entries[index].pos > pos)
1139
                index--;
1140
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1141
                index++;
1142
        }
1143

    
1144
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1145
        /* extract the current frame number */
1146
        ast2->frame_offset = st2->index_entries[index].timestamp;
1147
    }
1148

    
1149
    /* do the seek */
1150
    url_fseek(s->pb, pos, SEEK_SET);
1151
    avi->stream_index= -1;
1152
    return 0;
1153
}
1154

    
1155
static int avi_read_close(AVFormatContext *s)
1156
{
1157
    int i;
1158
    AVIContext *avi = s->priv_data;
1159

    
1160
    for(i=0;i<s->nb_streams;i++) {
1161
        AVStream *st = s->streams[i];
1162
        av_free(st->codec->palctrl);
1163
    }
1164

    
1165
    if (avi->dv_demux)
1166
        av_free(avi->dv_demux);
1167

    
1168
    return 0;
1169
}
1170

    
1171
static int avi_probe(AVProbeData *p)
1172
{
1173
    int i;
1174

    
1175
    /* check file header */
1176
    for(i=0; avi_headers[i][0]; i++)
1177
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1178
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1179
            return AVPROBE_SCORE_MAX;
1180

    
1181
    return 0;
1182
}
1183

    
1184
AVInputFormat avi_demuxer = {
1185
    "avi",
1186
    NULL_IF_CONFIG_SMALL("AVI format"),
1187
    sizeof(AVIContext),
1188
    avi_probe,
1189
    avi_read_header,
1190
    avi_read_packet,
1191
    avi_read_close,
1192
    avi_read_seek,
1193
};