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ffmpeg / libavformat / avidec.c @ b7c40744

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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
#include "avformat.h"
22
#include "avi.h"
23
#include "dv.h"
24
#include "riff.h"
25

    
26
#undef NDEBUG
27
#include <assert.h>
28

    
29
//#define DEBUG
30
//#define DEBUG_SEEK
31

    
32
typedef struct AVIStream {
33
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
34
                         (used to compute the pts) */
35
    int remaining;
36
    int packet_size;
37

    
38
    int scale;
39
    int rate;
40
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
41

    
42
    int64_t cum_len; /* temporary storage (used during seek) */
43

    
44
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45
    int prefix_count;
46
    uint32_t pal[256];
47
    int has_pal;
48
} AVIStream;
49

    
50
typedef struct {
51
    int64_t  riff_end;
52
    int64_t  movi_end;
53
    int64_t  fsize;
54
    offset_t movi_list;
55
    int index_loaded;
56
    int is_odml;
57
    int non_interleaved;
58
    int stream_index;
59
    DVDemuxContext* dv_demux;
60
} AVIContext;
61

    
62
static const char avi_headers[][8] = {
63
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
64
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
65
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
66
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
67
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
68
    { 0 }
69
};
70

    
71
static int avi_load_index(AVFormatContext *s);
72
static int guess_ni_flag(AVFormatContext *s);
73

    
74
#ifdef DEBUG
75
static void print_tag(const char *str, unsigned int tag, int size)
76
{
77
    printf("%s: tag=%c%c%c%c size=0x%x\n",
78
           str, tag & 0xff,
79
           (tag >> 8) & 0xff,
80
           (tag >> 16) & 0xff,
81
           (tag >> 24) & 0xff,
82
           size);
83
}
84
#endif
85

    
86
static int get_riff(AVIContext *avi, ByteIOContext *pb)
87
{
88
    char header[8];
89
    int i;
90

    
91
    /* check RIFF header */
92
    get_buffer(pb, header, 4);
93
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
94
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
95
    get_buffer(pb, header+4, 4);
96

    
97
    for(i=0; avi_headers[i][0]; i++)
98
        if(!memcmp(header, avi_headers[i], 8))
99
            break;
100
    if(!avi_headers[i][0])
101
        return -1;
102

    
103
    if(header[7] == 0x19)
104
        av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
105

    
106
    return 0;
107
}
108

    
109
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
110
    AVIContext *avi = s->priv_data;
111
    ByteIOContext *pb = s->pb;
112
    int longs_pre_entry= get_le16(pb);
113
    int index_sub_type = get_byte(pb);
114
    int index_type     = get_byte(pb);
115
    int entries_in_use = get_le32(pb);
116
    int chunk_id       = get_le32(pb);
117
    int64_t base       = get_le64(pb);
118
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
119
    AVStream *st;
120
    AVIStream *ast;
121
    int i;
122
    int64_t last_pos= -1;
123
    int64_t filesize= url_fsize(s->pb);
124

    
125
#ifdef DEBUG_SEEK
126
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
127
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
128
#endif
129

    
130
    if(stream_id > s->nb_streams || stream_id < 0)
131
        return -1;
132
    st= s->streams[stream_id];
133
    ast = st->priv_data;
134

    
135
    if(index_sub_type)
136
        return -1;
137

    
138
    get_le32(pb);
139

    
140
    if(index_type && longs_pre_entry != 2)
141
        return -1;
142
    if(index_type>1)
143
        return -1;
144

    
145
    if(filesize > 0 && base >= filesize){
146
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
147
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
148
            base &= 0xFFFFFFFF;
149
        else
150
            return -1;
151
    }
152

    
153
    for(i=0; i<entries_in_use; i++){
154
        if(index_type){
155
            int64_t pos= get_le32(pb) + base - 8;
156
            int len    = get_le32(pb);
157
            int key= len >= 0;
158
            len &= 0x7FFFFFFF;
159

    
160
#ifdef DEBUG_SEEK
161
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
162
#endif
163
            if(last_pos == pos || pos == base - 8)
164
                avi->non_interleaved= 1;
165
            else
166
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
167

    
168
            if(ast->sample_size)
169
                ast->cum_len += len;
170
            else
171
                ast->cum_len ++;
172
            last_pos= pos;
173
        }else{
174
            int64_t offset, pos;
175
            int duration;
176
            offset = get_le64(pb);
177
            get_le32(pb);       /* size */
178
            duration = get_le32(pb);
179
            pos = url_ftell(pb);
180

    
181
            url_fseek(pb, offset+8, SEEK_SET);
182
            read_braindead_odml_indx(s, frame_num);
183
            frame_num += duration;
184

    
185
            url_fseek(pb, pos, SEEK_SET);
186
        }
187
    }
188
    avi->index_loaded=1;
189
    return 0;
190
}
191

    
192
static void clean_index(AVFormatContext *s){
193
    int i;
194
    int64_t j;
195

    
196
    for(i=0; i<s->nb_streams; i++){
197
        AVStream *st = s->streams[i];
198
        AVIStream *ast = st->priv_data;
199
        int n= st->nb_index_entries;
200
        int max= ast->sample_size;
201
        int64_t pos, size, ts;
202

    
203
        if(n != 1 || ast->sample_size==0)
204
            continue;
205

    
206
        while(max < 1024) max+=max;
207

    
208
        pos= st->index_entries[0].pos;
209
        size= st->index_entries[0].size;
210
        ts= st->index_entries[0].timestamp;
211

    
212
        for(j=0; j<size; j+=max){
213
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
214
        }
215
    }
216
}
217

    
218
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
219
{
220
    offset_t i = url_ftell(pb);
221
    size += (size & 1);
222
    get_strz(pb, buf, maxlen);
223
    url_fseek(pb, i+size, SEEK_SET);
224
    return 0;
225
}
226

    
227
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
228
{
229
    AVIContext *avi = s->priv_data;
230
    ByteIOContext *pb = s->pb;
231
    uint32_t tag, tag1, handler;
232
    int codec_type, stream_index, frame_period, bit_rate;
233
    unsigned int size, nb_frames;
234
    int i;
235
    AVStream *st;
236
    AVIStream *ast = NULL;
237
    char str_track[4];
238
    int avih_width=0, avih_height=0;
239
    int amv_file_format=0;
240

    
241
    avi->stream_index= -1;
242

    
243
    if (get_riff(avi, pb) < 0)
244
        return -1;
245

    
246
    avi->fsize = url_fsize(pb);
247
    if(avi->fsize<=0)
248
        avi->fsize= avi->riff_end;
249

    
250
    /* first list tag */
251
    stream_index = -1;
252
    codec_type = -1;
253
    frame_period = 0;
254
    for(;;) {
255
        if (url_feof(pb))
256
            goto fail;
257
        tag = get_le32(pb);
258
        size = get_le32(pb);
259
#ifdef DEBUG
260
        print_tag("tag", tag, size);
261
#endif
262

    
263
        switch(tag) {
264
        case MKTAG('L', 'I', 'S', 'T'):
265
            /* ignored, except when start of video packets */
266
            tag1 = get_le32(pb);
267
#ifdef DEBUG
268
            print_tag("list", tag1, 0);
269
#endif
270
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
271
                avi->movi_list = url_ftell(pb) - 4;
272
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
273
                else     avi->movi_end = url_fsize(pb);
274
#ifdef DEBUG
275
                printf("movi end=%"PRIx64"\n", avi->movi_end);
276
#endif
277
                goto end_of_header;
278
            }
279
            break;
280
        case MKTAG('d', 'm', 'l', 'h'):
281
            avi->is_odml = 1;
282
            url_fskip(pb, size + (size & 1));
283
            break;
284
        case MKTAG('a', 'm', 'v', 'h'):
285
            amv_file_format=1;
286
        case MKTAG('a', 'v', 'i', 'h'):
287
            /* avi header */
288
            /* using frame_period is bad idea */
289
            frame_period = get_le32(pb);
290
            bit_rate = get_le32(pb) * 8;
291
            get_le32(pb);
292
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
293

    
294
            url_fskip(pb, 2 * 4);
295
            get_le32(pb);
296
            get_le32(pb);
297
            avih_width=get_le32(pb);
298
            avih_height=get_le32(pb);
299

    
300
            url_fskip(pb, size - 10 * 4);
301
            break;
302
        case MKTAG('s', 't', 'r', 'h'):
303
            /* stream header */
304

    
305
            tag1 = get_le32(pb);
306
            handler = get_le32(pb); /* codec tag */
307

    
308
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
309
                url_fskip(pb, size - 8);
310
                break;
311
            }else{
312
                stream_index++;
313
                st = av_new_stream(s, stream_index);
314
                if (!st)
315
                    goto fail;
316

    
317
                ast = av_mallocz(sizeof(AVIStream));
318
                if (!ast)
319
                    goto fail;
320
                st->priv_data = ast;
321
            }
322
            if(amv_file_format)
323
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
324

    
325
#ifdef DEBUG
326
            print_tag("strh", tag1, -1);
327
#endif
328
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
329
                int64_t dv_dur;
330

    
331
                /*
332
                 * After some consideration -- I don't think we
333
                 * have to support anything but DV in a type1 AVIs.
334
                 */
335
                if (s->nb_streams != 1)
336
                    goto fail;
337

    
338
                if (handler != MKTAG('d', 'v', 's', 'd') &&
339
                    handler != MKTAG('d', 'v', 'h', 'd') &&
340
                    handler != MKTAG('d', 'v', 's', 'l'))
341
                   goto fail;
342

    
343
                ast = s->streams[0]->priv_data;
344
                av_freep(&s->streams[0]->codec->extradata);
345
                av_freep(&s->streams[0]);
346
                s->nb_streams = 0;
347
                if (ENABLE_DV_DEMUXER) {
348
                    avi->dv_demux = dv_init_demux(s);
349
                    if (!avi->dv_demux)
350
                        goto fail;
351
                }
352
                s->streams[0]->priv_data = ast;
353
                url_fskip(pb, 3 * 4);
354
                ast->scale = get_le32(pb);
355
                ast->rate = get_le32(pb);
356
                url_fskip(pb, 4);  /* start time */
357

    
358
                dv_dur = get_le32(pb);
359
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
360
                    dv_dur *= AV_TIME_BASE;
361
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
362
                }
363
                /*
364
                 * else, leave duration alone; timing estimation in utils.c
365
                 *      will make a guess based on bit rate.
366
                 */
367

    
368
                stream_index = s->nb_streams - 1;
369
                url_fskip(pb, size - 9*4);
370
                break;
371
            }
372

    
373
            assert(stream_index < s->nb_streams);
374
            st->codec->stream_codec_tag= handler;
375

    
376
            get_le32(pb); /* flags */
377
            get_le16(pb); /* priority */
378
            get_le16(pb); /* language */
379
            get_le32(pb); /* initial frame */
380
            ast->scale = get_le32(pb);
381
            ast->rate = get_le32(pb);
382
            if(ast->scale && ast->rate){
383
            }else if(frame_period){
384
                ast->rate = 1000000;
385
                ast->scale = frame_period;
386
            }else{
387
                ast->rate = 25;
388
                ast->scale = 1;
389
            }
390
            av_set_pts_info(st, 64, ast->scale, ast->rate);
391

    
392
            ast->cum_len=get_le32(pb); /* start */
393
            nb_frames = get_le32(pb);
394

    
395
            st->start_time = 0;
396
            st->duration = nb_frames;
397
            get_le32(pb); /* buffer size */
398
            get_le32(pb); /* quality */
399
            ast->sample_size = get_le32(pb); /* sample ssize */
400
            ast->cum_len *= FFMAX(1, ast->sample_size);
401
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
402

    
403
            switch(tag1) {
404
            case MKTAG('v', 'i', 'd', 's'):
405
                codec_type = CODEC_TYPE_VIDEO;
406

    
407
                ast->sample_size = 0;
408
                break;
409
            case MKTAG('a', 'u', 'd', 's'):
410
                codec_type = CODEC_TYPE_AUDIO;
411
                break;
412
            case MKTAG('t', 'x', 't', 's'):
413
                //FIXME
414
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
415
                break;
416
            default:
417
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
418
                goto fail;
419
            }
420
            ast->frame_offset= ast->cum_len;
421
            url_fskip(pb, size - 12 * 4);
422
            break;
423
        case MKTAG('s', 't', 'r', 'f'):
424
            /* stream header */
425
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
426
                url_fskip(pb, size);
427
            } else {
428
                st = s->streams[stream_index];
429
                switch(codec_type) {
430
                case CODEC_TYPE_VIDEO:
431
                    if(amv_file_format){
432
                        st->codec->width=avih_width;
433
                        st->codec->height=avih_height;
434
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
435
                        st->codec->codec_id = CODEC_ID_AMV;
436
                        url_fskip(pb, size);
437
                        break;
438
                    }
439
                    get_le32(pb); /* size */
440
                    st->codec->width = get_le32(pb);
441
                    st->codec->height = get_le32(pb);
442
                    get_le16(pb); /* panes */
443
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
444
                    tag1 = get_le32(pb);
445
                    get_le32(pb); /* ImageSize */
446
                    get_le32(pb); /* XPelsPerMeter */
447
                    get_le32(pb); /* YPelsPerMeter */
448
                    get_le32(pb); /* ClrUsed */
449
                    get_le32(pb); /* ClrImportant */
450

    
451
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
452
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
453
                        st->codec->codec_tag = tag1;
454
                        st->codec->codec_id = CODEC_ID_XSUB;
455
                        break;
456
                    }
457

    
458
                    if(size > 10*4 && size<(1<<30)){
459
                        st->codec->extradata_size= size - 10*4;
460
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
461
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
462
                    }
463

    
464
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
465
                        get_byte(pb);
466

    
467
                    /* Extract palette from extradata if bpp <= 8 */
468
                    /* This code assumes that extradata contains only palette */
469
                    /* This is true for all paletted codecs implemented in ffmpeg */
470
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
471
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
472
#ifdef WORDS_BIGENDIAN
473
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
474
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
475
#else
476
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
477
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
478
#endif
479
                        st->codec->palctrl->palette_changed = 1;
480
                    }
481

    
482
#ifdef DEBUG
483
                    print_tag("video", tag1, 0);
484
#endif
485
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
486
                    st->codec->codec_tag = tag1;
487
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
488
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
489
//                    url_fskip(pb, size - 5 * 4);
490
                    break;
491
                case CODEC_TYPE_AUDIO:
492
                    get_wav_header(pb, st->codec, size);
493
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
494
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
495
                        ast->sample_size= st->codec->block_align;
496
                    }
497
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
498
                        url_fskip(pb, 1);
499
                    /* Force parsing as several audio frames can be in
500
                     * one packet and timestamps refer to packet start*/
501
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
502
                    /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
503
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
504
                        st->need_parsing = AVSTREAM_PARSE_NONE;
505
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
506
                     * audio in the header but have Axan as stream_code_tag. */
507
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
508
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
509
                        st->codec->codec_tag = 0;
510
                    }
511
                    if (amv_file_format)
512
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
513
                    break;
514
                default:
515
                    st->codec->codec_type = CODEC_TYPE_DATA;
516
                    st->codec->codec_id= CODEC_ID_NONE;
517
                    st->codec->codec_tag= 0;
518
                    url_fskip(pb, size);
519
                    break;
520
                }
521
            }
522
            break;
523
        case MKTAG('i', 'n', 'd', 'x'):
524
            i= url_ftell(pb);
525
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
526
                read_braindead_odml_indx(s, 0);
527
            }
528
            url_fseek(pb, i+size, SEEK_SET);
529
            break;
530
        case MKTAG('v', 'p', 'r', 'p'):
531
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
532
                AVRational active, active_aspect;
533

    
534
                st = s->streams[stream_index];
535
                get_le32(pb);
536
                get_le32(pb);
537
                get_le32(pb);
538
                get_le32(pb);
539
                get_le32(pb);
540

    
541
                active_aspect.num= get_le16(pb);
542
                active_aspect.den= get_le16(pb);
543
                active.num       = get_le32(pb);
544
                active.den       = get_le32(pb);
545
                get_le32(pb); //nbFieldsPerFrame
546

    
547
                if(active_aspect.num && active_aspect.den && active.num && active.den){
548
                    st->codec->sample_aspect_ratio= av_div_q(active_aspect, active);
549
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
550
                }
551
                size -= 9*4;
552
            }
553
            url_fseek(pb, size, SEEK_CUR);
554
            break;
555
        case MKTAG('I', 'N', 'A', 'M'):
556
            avi_read_tag(pb, s->title, sizeof(s->title), size);
557
            break;
558
        case MKTAG('I', 'A', 'R', 'T'):
559
            avi_read_tag(pb, s->author, sizeof(s->author), size);
560
            break;
561
        case MKTAG('I', 'C', 'O', 'P'):
562
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
563
            break;
564
        case MKTAG('I', 'C', 'M', 'T'):
565
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
566
            break;
567
        case MKTAG('I', 'G', 'N', 'R'):
568
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
569
            break;
570
        case MKTAG('I', 'P', 'R', 'D'):
571
            avi_read_tag(pb, s->album, sizeof(s->album), size);
572
            break;
573
        case MKTAG('I', 'P', 'R', 'T'):
574
            avi_read_tag(pb, str_track, sizeof(str_track), size);
575
            sscanf(str_track, "%d", &s->track);
576
            break;
577
        default:
578
            if(size > 1000000){
579
                av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
580
                                        "ill ignore it and try to continue anyway\n");
581
                avi->movi_list = url_ftell(pb) - 4;
582
                avi->movi_end  = url_fsize(pb);
583
                goto end_of_header;
584
            }
585
            /* skip tag */
586
            size += (size & 1);
587
            url_fskip(pb, size);
588
            break;
589
        }
590
    }
591
 end_of_header:
592
    /* check stream number */
593
    if (stream_index != s->nb_streams - 1) {
594
    fail:
595
        for(i=0;i<s->nb_streams;i++) {
596
            av_freep(&s->streams[i]->codec->extradata);
597
            av_freep(&s->streams[i]);
598
        }
599
        return -1;
600
    }
601

    
602
    if(!avi->index_loaded && !url_is_streamed(pb))
603
        avi_load_index(s);
604
    avi->index_loaded = 1;
605
    avi->non_interleaved |= guess_ni_flag(s);
606
    if(avi->non_interleaved)
607
        clean_index(s);
608

    
609
    return 0;
610
}
611

    
612
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
613
{
614
    AVIContext *avi = s->priv_data;
615
    ByteIOContext *pb = s->pb;
616
    int n, d[8], size;
617
    offset_t i, sync;
618
    void* dstr;
619

    
620
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
621
        size = dv_get_packet(avi->dv_demux, pkt);
622
        if (size >= 0)
623
            return size;
624
    }
625

    
626
    if(avi->non_interleaved){
627
        int best_stream_index = 0;
628
        AVStream *best_st= NULL;
629
        AVIStream *best_ast;
630
        int64_t best_ts= INT64_MAX;
631
        int i;
632

    
633
        for(i=0; i<s->nb_streams; i++){
634
            AVStream *st = s->streams[i];
635
            AVIStream *ast = st->priv_data;
636
            int64_t ts= ast->frame_offset;
637

    
638
            if(ast->sample_size)
639
                ts /= ast->sample_size;
640
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
641

    
642
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
643
            if(ts < best_ts){
644
                best_ts= ts;
645
                best_st= st;
646
                best_stream_index= i;
647
            }
648
        }
649
        best_ast = best_st->priv_data;
650
        best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
651
        if(best_ast->remaining)
652
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
653
        else
654
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
655

    
656
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
657
        if(i>=0){
658
            int64_t pos= best_st->index_entries[i].pos;
659
            pos += best_ast->packet_size - best_ast->remaining;
660
            url_fseek(s->pb, pos + 8, SEEK_SET);
661
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
662

    
663
            assert(best_ast->remaining <= best_ast->packet_size);
664

    
665
            avi->stream_index= best_stream_index;
666
            if(!best_ast->remaining)
667
                best_ast->packet_size=
668
                best_ast->remaining= best_st->index_entries[i].size;
669
        }
670
    }
671

    
672
resync:
673
    if(avi->stream_index >= 0){
674
        AVStream *st= s->streams[ avi->stream_index ];
675
        AVIStream *ast= st->priv_data;
676
        int size;
677

    
678
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
679
            size= INT_MAX;
680
        else if(ast->sample_size < 32)
681
            size= 64*ast->sample_size;
682
        else
683
            size= ast->sample_size;
684

    
685
        if(size > ast->remaining)
686
            size= ast->remaining;
687
        av_get_packet(pb, pkt, size);
688

    
689
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
690
            ast->has_pal=0;
691
            pkt->size += 4*256;
692
            pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
693
            if(pkt->data)
694
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
695
        }
696

    
697
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
698
            dstr = pkt->destruct;
699
            size = dv_produce_packet(avi->dv_demux, pkt,
700
                                    pkt->data, pkt->size);
701
            pkt->destruct = dstr;
702
            pkt->flags |= PKT_FLAG_KEY;
703
        } else {
704
            /* XXX: how to handle B frames in avi ? */
705
            pkt->dts = ast->frame_offset;
706
//                pkt->dts += ast->start;
707
            if(ast->sample_size)
708
                pkt->dts /= ast->sample_size;
709
//av_log(NULL, 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);
710
            pkt->stream_index = avi->stream_index;
711

    
712
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
713
                AVIndexEntry *e;
714
                int index;
715
                assert(st->index_entries);
716

    
717
                index= av_index_search_timestamp(st, pkt->dts, 0);
718
                e= &st->index_entries[index];
719

    
720
                if(index >= 0 && e->timestamp == ast->frame_offset){
721
                    if (e->flags & AVINDEX_KEYFRAME)
722
                        pkt->flags |= PKT_FLAG_KEY;
723
                }
724
            } else {
725
                pkt->flags |= PKT_FLAG_KEY;
726
            }
727
            if(ast->sample_size)
728
                ast->frame_offset += pkt->size;
729
            else
730
                ast->frame_offset++;
731
        }
732
        ast->remaining -= size;
733
        if(!ast->remaining){
734
            avi->stream_index= -1;
735
            ast->packet_size= 0;
736
        }
737

    
738
        return size;
739
    }
740

    
741
    memset(d, -1, sizeof(int)*8);
742
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
743
        int j;
744

    
745
        for(j=0; j<7; j++)
746
            d[j]= d[j+1];
747
        d[7]= get_byte(pb);
748

    
749
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
750

    
751
        if(    d[2] >= '0' && d[2] <= '9'
752
            && d[3] >= '0' && d[3] <= '9'){
753
            n= (d[2] - '0') * 10 + (d[3] - '0');
754
        }else{
755
            n= 100; //invalid stream id
756
        }
757
//av_log(NULL, 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);
758
        if(i + size > avi->fsize || d[0]<0)
759
            continue;
760

    
761
        //parse ix##
762
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
763
        //parse JUNK
764
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
765
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
766
            url_fskip(pb, size);
767
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
768
            goto resync;
769
        }
770

    
771
        if(    d[0] >= '0' && d[0] <= '9'
772
            && d[1] >= '0' && d[1] <= '9'){
773
            n= (d[0] - '0') * 10 + (d[1] - '0');
774
        }else{
775
            n= 100; //invalid stream id
776
        }
777

    
778
        //parse ##dc/##wb
779
        if(n < s->nb_streams){
780
          AVStream *st;
781
          AVIStream *ast;
782
          st = s->streams[n];
783
          ast = st->priv_data;
784

    
785
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
786
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
787
             || st->discard >= AVDISCARD_ALL){
788
                if(ast->sample_size) ast->frame_offset += pkt->size;
789
                else                 ast->frame_offset++;
790
                url_fskip(pb, size);
791
                goto resync;
792
          }
793

    
794
          if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
795
                int k = get_byte(pb);
796
                int last = (k + get_byte(pb) - 1) & 0xFF;
797

    
798
                get_le16(pb); //flags
799

    
800
                for (; k <= last; k++)
801
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
802
                ast->has_pal= 1;
803
                goto resync;
804
          } else
805
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
806
                d[2]*256+d[3] == ast->prefix /*||
807
                (d[2] == 'd' && d[3] == 'c') ||
808
                (d[2] == 'w' && d[3] == 'b')*/) {
809

    
810
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
811
            if(d[2]*256+d[3] == ast->prefix)
812
                ast->prefix_count++;
813
            else{
814
                ast->prefix= d[2]*256+d[3];
815
                ast->prefix_count= 0;
816
            }
817

    
818
            avi->stream_index= n;
819
            ast->packet_size= size + 8;
820
            ast->remaining= size;
821

    
822
            {
823
                uint64_t pos= url_ftell(pb) - 8;
824
                if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
825
                    av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
826
                }
827
            }
828
            goto resync;
829
          }
830
        }
831
    }
832

    
833
    return -1;
834
}
835

    
836
/* XXX: we make the implicit supposition that the position are sorted
837
   for each stream */
838
static int avi_read_idx1(AVFormatContext *s, int size)
839
{
840
    AVIContext *avi = s->priv_data;
841
    ByteIOContext *pb = s->pb;
842
    int nb_index_entries, i;
843
    AVStream *st;
844
    AVIStream *ast;
845
    unsigned int index, tag, flags, pos, len;
846
    unsigned last_pos= -1;
847

    
848
    nb_index_entries = size / 16;
849
    if (nb_index_entries <= 0)
850
        return -1;
851

    
852
    /* read the entries and sort them in each stream component */
853
    for(i = 0; i < nb_index_entries; i++) {
854
        tag = get_le32(pb);
855
        flags = get_le32(pb);
856
        pos = get_le32(pb);
857
        len = get_le32(pb);
858
#if defined(DEBUG_SEEK)
859
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
860
               i, tag, flags, pos, len);
861
#endif
862
        if(i==0 && pos > avi->movi_list)
863
            avi->movi_list= 0; //FIXME better check
864
        pos += avi->movi_list;
865

    
866
        index = ((tag & 0xff) - '0') * 10;
867
        index += ((tag >> 8) & 0xff) - '0';
868
        if (index >= s->nb_streams)
869
            continue;
870
        st = s->streams[index];
871
        ast = st->priv_data;
872

    
873
#if defined(DEBUG_SEEK)
874
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
875
#endif
876
        if(last_pos == pos)
877
            avi->non_interleaved= 1;
878
        else
879
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
880
        if(ast->sample_size)
881
            ast->cum_len += len;
882
        else
883
            ast->cum_len ++;
884
        last_pos= pos;
885
    }
886
    return 0;
887
}
888

    
889
static int guess_ni_flag(AVFormatContext *s){
890
    int i;
891
    int64_t last_start=0;
892
    int64_t first_end= INT64_MAX;
893

    
894
    for(i=0; i<s->nb_streams; i++){
895
        AVStream *st = s->streams[i];
896
        int n= st->nb_index_entries;
897

    
898
        if(n <= 0)
899
            continue;
900

    
901
        if(st->index_entries[0].pos > last_start)
902
            last_start= st->index_entries[0].pos;
903
        if(st->index_entries[n-1].pos < first_end)
904
            first_end= st->index_entries[n-1].pos;
905
    }
906
    return last_start > first_end;
907
}
908

    
909
static int avi_load_index(AVFormatContext *s)
910
{
911
    AVIContext *avi = s->priv_data;
912
    ByteIOContext *pb = s->pb;
913
    uint32_t tag, size;
914
    offset_t pos= url_ftell(pb);
915

    
916
    url_fseek(pb, avi->movi_end, SEEK_SET);
917
#ifdef DEBUG_SEEK
918
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
919
#endif
920
    for(;;) {
921
        if (url_feof(pb))
922
            break;
923
        tag = get_le32(pb);
924
        size = get_le32(pb);
925
#ifdef DEBUG_SEEK
926
        printf("tag=%c%c%c%c size=0x%x\n",
927
               tag & 0xff,
928
               (tag >> 8) & 0xff,
929
               (tag >> 16) & 0xff,
930
               (tag >> 24) & 0xff,
931
               size);
932
#endif
933
        switch(tag) {
934
        case MKTAG('i', 'd', 'x', '1'):
935
            if (avi_read_idx1(s, size) < 0)
936
                goto skip;
937
            else
938
                goto the_end;
939
            break;
940
        default:
941
        skip:
942
            size += (size & 1);
943
            url_fskip(pb, size);
944
            break;
945
        }
946
    }
947
 the_end:
948
    url_fseek(pb, pos, SEEK_SET);
949
    return 0;
950
}
951

    
952
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
953
{
954
    AVIContext *avi = s->priv_data;
955
    AVStream *st;
956
    int i, index;
957
    int64_t pos;
958

    
959
    if (!avi->index_loaded) {
960
        /* we only load the index on demand */
961
        avi_load_index(s);
962
        avi->index_loaded = 1;
963
    }
964
    assert(stream_index>= 0);
965

    
966
    st = s->streams[stream_index];
967
    index= av_index_search_timestamp(st, timestamp, flags);
968
    if(index<0)
969
        return -1;
970

    
971
    /* find the position */
972
    pos = st->index_entries[index].pos;
973
    timestamp = st->index_entries[index].timestamp;
974

    
975
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
976

    
977
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
978
        /* One and only one real stream for DV in AVI, and it has video  */
979
        /* offsets. Calling with other stream indices should have failed */
980
        /* the av_index_search_timestamp call above.                     */
981
        assert(stream_index == 0);
982

    
983
        /* Feed the DV video stream version of the timestamp to the */
984
        /* DV demux so it can synth correct timestamps              */
985
        dv_offset_reset(avi->dv_demux, timestamp);
986

    
987
        url_fseek(s->pb, pos, SEEK_SET);
988
        avi->stream_index= -1;
989
        return 0;
990
    }
991

    
992
    for(i = 0; i < s->nb_streams; i++) {
993
        AVStream *st2 = s->streams[i];
994
        AVIStream *ast2 = st2->priv_data;
995

    
996
        ast2->packet_size=
997
        ast2->remaining= 0;
998

    
999
        if (st2->nb_index_entries <= 0)
1000
            continue;
1001

    
1002
//        assert(st2->codec->block_align);
1003
        assert(st2->time_base.den == ast2->rate);
1004
        assert(st2->time_base.num == ast2->scale);
1005
        index = av_index_search_timestamp(
1006
                st2,
1007
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1008
                flags | AVSEEK_FLAG_BACKWARD);
1009
        if(index<0)
1010
            index=0;
1011

    
1012
        if(!avi->non_interleaved){
1013
            while(index>0 && st2->index_entries[index].pos > pos)
1014
                index--;
1015
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1016
                index++;
1017
        }
1018

    
1019
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1020
        /* extract the current frame number */
1021
        ast2->frame_offset = st2->index_entries[index].timestamp;
1022
        if(ast2->sample_size)
1023
            ast2->frame_offset *=ast2->sample_size;
1024
    }
1025

    
1026
    /* do the seek */
1027
    url_fseek(s->pb, pos, SEEK_SET);
1028
    avi->stream_index= -1;
1029
    return 0;
1030
}
1031

    
1032
static int avi_read_close(AVFormatContext *s)
1033
{
1034
    int i;
1035
    AVIContext *avi = s->priv_data;
1036

    
1037
    for(i=0;i<s->nb_streams;i++) {
1038
        AVStream *st = s->streams[i];
1039
        AVIStream *ast = st->priv_data;
1040
        av_free(ast);
1041
        av_free(st->codec->palctrl);
1042
    }
1043

    
1044
    if (avi->dv_demux)
1045
        av_free(avi->dv_demux);
1046

    
1047
    return 0;
1048
}
1049

    
1050
static int avi_probe(AVProbeData *p)
1051
{
1052
    int i;
1053

    
1054
    /* check file header */
1055
    for(i=0; avi_headers[i][0]; i++)
1056
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1057
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1058
            return AVPROBE_SCORE_MAX;
1059

    
1060
    return 0;
1061
}
1062

    
1063
AVInputFormat avi_demuxer = {
1064
    "avi",
1065
    "avi format",
1066
    sizeof(AVIContext),
1067
    avi_probe,
1068
    avi_read_header,
1069
    avi_read_packet,
1070
    avi_read_close,
1071
    avi_read_seek,
1072
};