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ffmpeg / libavformat / avidec.c @ d7fb5a18

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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
    int64_t movi_list;
55
    int64_t last_pkt_pos;
56
    int index_loaded;
57
    int is_odml;
58
    int non_interleaved;
59
    int stream_index;
60
    DVDemuxContext* dv_demux;
61
} AVIContext;
62

    
63
static const char avi_headers[][8] = {
64
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
65
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
66
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
67
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
68
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
69
    { 0 }
70
};
71

    
72
static int avi_load_index(AVFormatContext *s);
73
static int guess_ni_flag(AVFormatContext *s);
74

    
75
#ifdef DEBUG
76
static void print_tag(const char *str, unsigned int tag, int size)
77
{
78
    printf("%s: tag=%c%c%c%c size=0x%x\n",
79
           str, tag & 0xff,
80
           (tag >> 8) & 0xff,
81
           (tag >> 16) & 0xff,
82
           (tag >> 24) & 0xff,
83
           size);
84
}
85
#endif
86

    
87
static int get_riff(AVIContext *avi, ByteIOContext *pb)
88
{
89
    char header[8];
90
    int i;
91

    
92
    /* check RIFF header */
93
    get_buffer(pb, header, 4);
94
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
95
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
96
    get_buffer(pb, header+4, 4);
97

    
98
    for(i=0; avi_headers[i][0]; i++)
99
        if(!memcmp(header, avi_headers[i], 8))
100
            break;
101
    if(!avi_headers[i][0])
102
        return -1;
103

    
104
    if(header[7] == 0x19)
105
        av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
106

    
107
    return 0;
108
}
109

    
110
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
111
    AVIContext *avi = s->priv_data;
112
    ByteIOContext *pb = s->pb;
113
    int longs_pre_entry= get_le16(pb);
114
    int index_sub_type = get_byte(pb);
115
    int index_type     = get_byte(pb);
116
    int entries_in_use = get_le32(pb);
117
    int chunk_id       = get_le32(pb);
118
    int64_t base       = get_le64(pb);
119
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
120
    AVStream *st;
121
    AVIStream *ast;
122
    int i;
123
    int64_t last_pos= -1;
124
    int64_t filesize= url_fsize(s->pb);
125

    
126
#ifdef DEBUG_SEEK
127
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
128
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
129
#endif
130

    
131
    if(stream_id > s->nb_streams || stream_id < 0)
132
        return -1;
133
    st= s->streams[stream_id];
134
    ast = st->priv_data;
135

    
136
    if(index_sub_type)
137
        return -1;
138

    
139
    get_le32(pb);
140

    
141
    if(index_type && longs_pre_entry != 2)
142
        return -1;
143
    if(index_type>1)
144
        return -1;
145

    
146
    if(filesize > 0 && base >= filesize){
147
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
148
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
149
            base &= 0xFFFFFFFF;
150
        else
151
            return -1;
152
    }
153

    
154
    for(i=0; i<entries_in_use; i++){
155
        if(index_type){
156
            int64_t pos= get_le32(pb) + base - 8;
157
            int len    = get_le32(pb);
158
            int key= len >= 0;
159
            len &= 0x7FFFFFFF;
160

    
161
#ifdef DEBUG_SEEK
162
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
163
#endif
164
            if(last_pos == pos || pos == base - 8)
165
                avi->non_interleaved= 1;
166
            if(last_pos != pos)
167
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
168

    
169
            if(ast->sample_size)
170
                ast->cum_len += len;
171
            else
172
                ast->cum_len ++;
173
            last_pos= pos;
174
        }else{
175
            int64_t offset, pos;
176
            int duration;
177
            offset = get_le64(pb);
178
            get_le32(pb);       /* size */
179
            duration = get_le32(pb);
180
            pos = url_ftell(pb);
181

    
182
            url_fseek(pb, offset+8, SEEK_SET);
183
            read_braindead_odml_indx(s, frame_num);
184
            frame_num += duration;
185

    
186
            url_fseek(pb, pos, SEEK_SET);
187
        }
188
    }
189
    avi->index_loaded=1;
190
    return 0;
191
}
192

    
193
static void clean_index(AVFormatContext *s){
194
    int i;
195
    int64_t j;
196

    
197
    for(i=0; i<s->nb_streams; i++){
198
        AVStream *st = s->streams[i];
199
        AVIStream *ast = st->priv_data;
200
        int n= st->nb_index_entries;
201
        int max= ast->sample_size;
202
        int64_t pos, size, ts;
203

    
204
        if(n != 1 || ast->sample_size==0)
205
            continue;
206

    
207
        while(max < 1024) max+=max;
208

    
209
        pos= st->index_entries[0].pos;
210
        size= st->index_entries[0].size;
211
        ts= st->index_entries[0].timestamp;
212

    
213
        for(j=0; j<size; j+=max){
214
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
215
        }
216
    }
217
}
218

    
219
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
220
{
221
    int64_t i = url_ftell(pb);
222
    size += (size & 1);
223
    get_strz(pb, buf, maxlen);
224
    url_fseek(pb, i+size, SEEK_SET);
225
    return 0;
226
}
227

    
228
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
229
{
230
    AVIContext *avi = s->priv_data;
231
    ByteIOContext *pb = s->pb;
232
    uint32_t tag, tag1, handler;
233
    int codec_type, stream_index, frame_period, bit_rate;
234
    unsigned int size, nb_frames;
235
    int i;
236
    AVStream *st;
237
    AVIStream *ast = NULL;
238
    char str_track[4];
239
    int avih_width=0, avih_height=0;
240
    int amv_file_format=0;
241

    
242
    avi->stream_index= -1;
243

    
244
    if (get_riff(avi, pb) < 0)
245
        return -1;
246

    
247
    avi->fsize = url_fsize(pb);
248
    if(avi->fsize<=0)
249
        avi->fsize= avi->riff_end;
250

    
251
    /* first list tag */
252
    stream_index = -1;
253
    codec_type = -1;
254
    frame_period = 0;
255
    for(;;) {
256
        if (url_feof(pb))
257
            goto fail;
258
        tag = get_le32(pb);
259
        size = get_le32(pb);
260
#ifdef DEBUG
261
        print_tag("tag", tag, size);
262
#endif
263

    
264
        switch(tag) {
265
        case MKTAG('L', 'I', 'S', 'T'):
266
            /* Ignored, except at start of video packets. */
267
            tag1 = get_le32(pb);
268
#ifdef DEBUG
269
            print_tag("list", tag1, 0);
270
#endif
271
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
272
                avi->movi_list = url_ftell(pb) - 4;
273
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
274
                else     avi->movi_end = url_fsize(pb);
275
#ifdef DEBUG
276
                printf("movi end=%"PRIx64"\n", avi->movi_end);
277
#endif
278
                goto end_of_header;
279
            }
280
            break;
281
        case MKTAG('d', 'm', 'l', 'h'):
282
            avi->is_odml = 1;
283
            url_fskip(pb, size + (size & 1));
284
            break;
285
        case MKTAG('a', 'm', 'v', 'h'):
286
            amv_file_format=1;
287
        case MKTAG('a', 'v', 'i', 'h'):
288
            /* AVI header */
289
            /* using frame_period is bad idea */
290
            frame_period = get_le32(pb);
291
            bit_rate = get_le32(pb) * 8;
292
            get_le32(pb);
293
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
294

    
295
            url_fskip(pb, 2 * 4);
296
            get_le32(pb);
297
            get_le32(pb);
298
            avih_width=get_le32(pb);
299
            avih_height=get_le32(pb);
300

    
301
            url_fskip(pb, size - 10 * 4);
302
            break;
303
        case MKTAG('s', 't', 'r', 'h'):
304
            /* stream header */
305

    
306
            tag1 = get_le32(pb);
307
            handler = get_le32(pb); /* codec tag */
308

    
309
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
310
                url_fskip(pb, size - 8);
311
                break;
312
            }else{
313
                stream_index++;
314
                st = av_new_stream(s, stream_index);
315
                if (!st)
316
                    goto fail;
317

    
318
                ast = av_mallocz(sizeof(AVIStream));
319
                if (!ast)
320
                    goto fail;
321
                st->priv_data = ast;
322
            }
323
            if(amv_file_format)
324
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
325

    
326
#ifdef DEBUG
327
            print_tag("strh", tag1, -1);
328
#endif
329
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
330
                int64_t dv_dur;
331

    
332
                /*
333
                 * After some consideration -- I don't think we
334
                 * have to support anything but DV in type1 AVIs.
335
                 */
336
                if (s->nb_streams != 1)
337
                    goto fail;
338

    
339
                if (handler != MKTAG('d', 'v', 's', 'd') &&
340
                    handler != MKTAG('d', 'v', 'h', 'd') &&
341
                    handler != MKTAG('d', 'v', 's', 'l'))
342
                   goto fail;
343

    
344
                ast = s->streams[0]->priv_data;
345
                av_freep(&s->streams[0]->codec->extradata);
346
                av_freep(&s->streams[0]);
347
                s->nb_streams = 0;
348
                if (ENABLE_DV_DEMUXER) {
349
                    avi->dv_demux = dv_init_demux(s);
350
                    if (!avi->dv_demux)
351
                        goto fail;
352
                }
353
                s->streams[0]->priv_data = ast;
354
                url_fskip(pb, 3 * 4);
355
                ast->scale = get_le32(pb);
356
                ast->rate = get_le32(pb);
357
                url_fskip(pb, 4);  /* start time */
358

    
359
                dv_dur = get_le32(pb);
360
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
361
                    dv_dur *= AV_TIME_BASE;
362
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
363
                }
364
                /*
365
                 * else, leave duration alone; timing estimation in utils.c
366
                 *      will make a guess based on bitrate.
367
                 */
368

    
369
                stream_index = s->nb_streams - 1;
370
                url_fskip(pb, size - 9*4);
371
                break;
372
            }
373

    
374
            assert(stream_index < s->nb_streams);
375
            st->codec->stream_codec_tag= handler;
376

    
377
            get_le32(pb); /* flags */
378
            get_le16(pb); /* priority */
379
            get_le16(pb); /* language */
380
            get_le32(pb); /* initial frame */
381
            ast->scale = get_le32(pb);
382
            ast->rate = get_le32(pb);
383
            if(!(ast->scale && ast->rate)){
384
                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);
385
                if(frame_period){
386
                    ast->rate = 1000000;
387
                    ast->scale = frame_period;
388
                }else{
389
                    ast->rate = 25;
390
                    ast->scale = 1;
391
                }
392
            }
393
            av_set_pts_info(st, 64, ast->scale, ast->rate);
394

    
395
            ast->cum_len=get_le32(pb); /* start */
396
            nb_frames = get_le32(pb);
397

    
398
            st->start_time = 0;
399
            st->duration = nb_frames;
400
            get_le32(pb); /* buffer size */
401
            get_le32(pb); /* quality */
402
            ast->sample_size = get_le32(pb); /* sample ssize */
403
            ast->cum_len *= FFMAX(1, ast->sample_size);
404
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
405

    
406
            switch(tag1) {
407
            case MKTAG('v', 'i', 'd', 's'):
408
                codec_type = CODEC_TYPE_VIDEO;
409

    
410
                ast->sample_size = 0;
411
                break;
412
            case MKTAG('a', 'u', 'd', 's'):
413
                codec_type = CODEC_TYPE_AUDIO;
414
                break;
415
            case MKTAG('t', 'x', 't', 's'):
416
                //FIXME
417
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
418
                break;
419
            case MKTAG('d', 'a', 't', 's'):
420
                codec_type = CODEC_TYPE_DATA;
421
                break;
422
            default:
423
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
424
                goto fail;
425
            }
426
            ast->frame_offset= ast->cum_len;
427
            url_fskip(pb, size - 12 * 4);
428
            break;
429
        case MKTAG('s', 't', 'r', 'f'):
430
            /* stream header */
431
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
432
                url_fskip(pb, size);
433
            } else {
434
                st = s->streams[stream_index];
435
                switch(codec_type) {
436
                case CODEC_TYPE_VIDEO:
437
                    if(amv_file_format){
438
                        st->codec->width=avih_width;
439
                        st->codec->height=avih_height;
440
                        st->codec->codec_type = CODEC_TYPE_VIDEO;
441
                        st->codec->codec_id = CODEC_ID_AMV;
442
                        url_fskip(pb, size);
443
                        break;
444
                    }
445
                    get_le32(pb); /* size */
446
                    st->codec->width = get_le32(pb);
447
                    st->codec->height = get_le32(pb);
448
                    get_le16(pb); /* panes */
449
                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
450
                    tag1 = get_le32(pb);
451
                    get_le32(pb); /* ImageSize */
452
                    get_le32(pb); /* XPelsPerMeter */
453
                    get_le32(pb); /* YPelsPerMeter */
454
                    get_le32(pb); /* ClrUsed */
455
                    get_le32(pb); /* ClrImportant */
456

    
457
                    if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
458
                        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
459
                        st->codec->codec_tag = tag1;
460
                        st->codec->codec_id = CODEC_ID_XSUB;
461
                        break;
462
                    }
463

    
464
                    if(size > 10*4 && size<(1<<30)){
465
                        st->codec->extradata_size= size - 10*4;
466
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
467
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
468
                    }
469

    
470
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
471
                        get_byte(pb);
472

    
473
                    /* Extract palette from extradata if bpp <= 8. */
474
                    /* This code assumes that extradata contains only palette. */
475
                    /* This is true for all paletted codecs implemented in FFmpeg. */
476
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
477
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
478
#ifdef WORDS_BIGENDIAN
479
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
480
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
481
#else
482
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
483
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
484
#endif
485
                        st->codec->palctrl->palette_changed = 1;
486
                    }
487

    
488
#ifdef DEBUG
489
                    print_tag("video", tag1, 0);
490
#endif
491
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
492
                    st->codec->codec_tag = tag1;
493
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
494
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
495
//                    url_fskip(pb, size - 5 * 4);
496
                    break;
497
                case CODEC_TYPE_AUDIO:
498
                    get_wav_header(pb, st->codec, size);
499
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
500
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
501
                        ast->sample_size= st->codec->block_align;
502
                    }
503
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
504
                        url_fskip(pb, 1);
505
                    /* Force parsing as several audio frames can be in
506
                     * one packet and timestamps refer to packet start. */
507
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
508
                    /* ADTS header is in extradata, AAC without header must be
509
                     * stored as exact frames. Parser not needed and it will
510
                     * fail. */
511
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
512
                        st->need_parsing = AVSTREAM_PARSE_NONE;
513
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
514
                     * audio in the header but have Axan as stream_code_tag. */
515
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
516
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
517
                        st->codec->codec_tag = 0;
518
                    }
519
                    if (amv_file_format)
520
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
521
                    break;
522
                default:
523
                    st->codec->codec_type = CODEC_TYPE_DATA;
524
                    st->codec->codec_id= CODEC_ID_NONE;
525
                    st->codec->codec_tag= 0;
526
                    url_fskip(pb, size);
527
                    break;
528
                }
529
            }
530
            break;
531
        case MKTAG('i', 'n', 'd', 'x'):
532
            i= url_ftell(pb);
533
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
534
                read_braindead_odml_indx(s, 0);
535
            }
536
            url_fseek(pb, i+size, SEEK_SET);
537
            break;
538
        case MKTAG('v', 'p', 'r', 'p'):
539
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
540
                AVRational active, active_aspect;
541

    
542
                st = s->streams[stream_index];
543
                get_le32(pb);
544
                get_le32(pb);
545
                get_le32(pb);
546
                get_le32(pb);
547
                get_le32(pb);
548

    
549
                active_aspect.den= get_le16(pb);
550
                active_aspect.num= get_le16(pb);
551
                active.num       = get_le32(pb);
552
                active.den       = get_le32(pb);
553
                get_le32(pb); //nbFieldsPerFrame
554

    
555
                if(active_aspect.num && active_aspect.den && active.num && active.den){
556
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
557
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
558
                }
559
                size -= 9*4;
560
            }
561
            url_fseek(pb, size, SEEK_CUR);
562
            break;
563
        case MKTAG('I', 'N', 'A', 'M'):
564
            avi_read_tag(pb, s->title, sizeof(s->title), size);
565
            break;
566
        case MKTAG('I', 'A', 'R', 'T'):
567
            avi_read_tag(pb, s->author, sizeof(s->author), size);
568
            break;
569
        case MKTAG('I', 'C', 'O', 'P'):
570
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
571
            break;
572
        case MKTAG('I', 'C', 'M', 'T'):
573
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
574
            break;
575
        case MKTAG('I', 'G', 'N', 'R'):
576
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
577
            break;
578
        case MKTAG('I', 'P', 'R', 'D'):
579
            avi_read_tag(pb, s->album, sizeof(s->album), size);
580
            break;
581
        case MKTAG('I', 'P', 'R', 'T'):
582
            avi_read_tag(pb, str_track, sizeof(str_track), size);
583
            sscanf(str_track, "%d", &s->track);
584
            break;
585
        default:
586
            if(size > 1000000){
587
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
588
                                        "I will ignore it and try to continue anyway.\n");
589
                avi->movi_list = url_ftell(pb) - 4;
590
                avi->movi_end  = url_fsize(pb);
591
                goto end_of_header;
592
            }
593
            /* skip tag */
594
            size += (size & 1);
595
            url_fskip(pb, size);
596
            break;
597
        }
598
    }
599
 end_of_header:
600
    /* check stream number */
601
    if (stream_index != s->nb_streams - 1) {
602
    fail:
603
        return -1;
604
    }
605

    
606
    if(!avi->index_loaded && !url_is_streamed(pb))
607
        avi_load_index(s);
608
    avi->index_loaded = 1;
609
    avi->non_interleaved |= guess_ni_flag(s);
610
    if(avi->non_interleaved) {
611
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
612
        clean_index(s);
613
    }
614

    
615
    return 0;
616
}
617

    
618
static int get_stream_idx(int *d){
619
    if(    d[0] >= '0' && d[0] <= '9'
620
        && d[1] >= '0' && d[1] <= '9'){
621
        return (d[0] - '0') * 10 + (d[1] - '0');
622
    }else{
623
        return 100; //invalid stream ID
624
    }
625
}
626

    
627
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
628
{
629
    AVIContext *avi = s->priv_data;
630
    ByteIOContext *pb = s->pb;
631
    int n, d[8], size;
632
    int64_t i, sync;
633
    void* dstr;
634

    
635
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
636
        size = dv_get_packet(avi->dv_demux, pkt);
637
        if (size >= 0)
638
            return size;
639
    }
640

    
641
    if(avi->non_interleaved){
642
        int best_stream_index = 0;
643
        AVStream *best_st= NULL;
644
        AVIStream *best_ast;
645
        int64_t best_ts= INT64_MAX;
646
        int i;
647

    
648
        for(i=0; i<s->nb_streams; i++){
649
            AVStream *st = s->streams[i];
650
            AVIStream *ast = st->priv_data;
651
            int64_t ts= ast->frame_offset;
652

    
653
            if(ast->sample_size)
654
                ts /= ast->sample_size;
655
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
656

    
657
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
658
            if(ts < best_ts && st->nb_index_entries){
659
                best_ts= ts;
660
                best_st= st;
661
                best_stream_index= i;
662
            }
663
        }
664
        if(!best_st)
665
            return -1;
666

    
667
        best_ast = best_st->priv_data;
668
        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
669
        if(best_ast->remaining)
670
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
671
        else{
672
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
673
            if(i>=0)
674
                best_ast->frame_offset= best_st->index_entries[i].timestamp
675
                                      * FFMAX(1, best_ast->sample_size);
676
        }
677

    
678
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
679
        if(i>=0){
680
            int64_t pos= best_st->index_entries[i].pos;
681
            pos += best_ast->packet_size - best_ast->remaining;
682
            url_fseek(s->pb, pos + 8, SEEK_SET);
683
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
684

    
685
            assert(best_ast->remaining <= best_ast->packet_size);
686

    
687
            avi->stream_index= best_stream_index;
688
            if(!best_ast->remaining)
689
                best_ast->packet_size=
690
                best_ast->remaining= best_st->index_entries[i].size;
691
        }
692
    }
693

    
694
resync:
695
    if(avi->stream_index >= 0){
696
        AVStream *st= s->streams[ avi->stream_index ];
697
        AVIStream *ast= st->priv_data;
698
        int size;
699

    
700
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
701
            size= INT_MAX;
702
        else if(ast->sample_size < 32)
703
            size= 64*ast->sample_size;
704
        else
705
            size= ast->sample_size;
706

    
707
        if(size > ast->remaining)
708
            size= ast->remaining;
709
        avi->last_pkt_pos= url_ftell(pb);
710
        av_get_packet(pb, pkt, size);
711

    
712
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
713
            ast->has_pal=0;
714
            pkt->size += 4*256;
715
            pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
716
            if(pkt->data)
717
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
718
        }
719

    
720
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
721
            dstr = pkt->destruct;
722
            size = dv_produce_packet(avi->dv_demux, pkt,
723
                                    pkt->data, pkt->size);
724
            pkt->destruct = dstr;
725
            pkt->flags |= PKT_FLAG_KEY;
726
        } else {
727
            /* XXX: How to handle B-frames in AVI? */
728
            pkt->dts = ast->frame_offset;
729
//                pkt->dts += ast->start;
730
            if(ast->sample_size)
731
                pkt->dts /= ast->sample_size;
732
//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);
733
            pkt->stream_index = avi->stream_index;
734

    
735
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
736
                AVIndexEntry *e;
737
                int index;
738
                assert(st->index_entries);
739

    
740
                index= av_index_search_timestamp(st, pkt->dts, 0);
741
                e= &st->index_entries[index];
742

    
743
                if(index >= 0 && e->timestamp == ast->frame_offset){
744
                    if (e->flags & AVINDEX_KEYFRAME)
745
                        pkt->flags |= PKT_FLAG_KEY;
746
                }
747
            } else {
748
                pkt->flags |= PKT_FLAG_KEY;
749
            }
750
            if(ast->sample_size)
751
                ast->frame_offset += pkt->size;
752
            else
753
                ast->frame_offset++;
754
        }
755
        ast->remaining -= size;
756
        if(!ast->remaining){
757
            avi->stream_index= -1;
758
            ast->packet_size= 0;
759
        }
760

    
761
        return size;
762
    }
763

    
764
    memset(d, -1, sizeof(int)*8);
765
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
766
        int j;
767

    
768
        for(j=0; j<7; j++)
769
            d[j]= d[j+1];
770
        d[7]= get_byte(pb);
771

    
772
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
773

    
774
        n= get_stream_idx(d+2);
775
//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);
776
        if(i + size > avi->fsize || d[0]<0)
777
            continue;
778

    
779
        //parse ix##
780
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
781
        //parse JUNK
782
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
783
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
784
            url_fskip(pb, size);
785
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
786
            goto resync;
787
        }
788

    
789
        n= get_stream_idx(d);
790

    
791
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
792
            continue;
793

    
794
        //parse ##dc/##wb
795
        if(n < s->nb_streams){
796
            AVStream *st;
797
            AVIStream *ast;
798
            st = s->streams[n];
799
            ast = st->priv_data;
800

    
801
            if(s->nb_streams>=2){
802
                AVStream *st1  = s->streams[1];
803
                AVIStream *ast1= st1->priv_data;
804
                //workaround for broken small-file-bug402.avi
805
                if(   d[2] == 'w' && d[3] == 'b'
806
                   && n==0
807
                   && st ->codec->codec_type == CODEC_TYPE_VIDEO
808
                   && st1->codec->codec_type == CODEC_TYPE_AUDIO
809
                   && ast->prefix == 'd'*256+'c'
810
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
811
                  ){
812
                    n=1;
813
                    st = st1;
814
                    ast = ast1;
815
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
816
                }
817
            }
818

    
819

    
820
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
821
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
822
               || st->discard >= AVDISCARD_ALL){
823
                if(ast->sample_size) ast->frame_offset += pkt->size;
824
                else                 ast->frame_offset++;
825
                url_fskip(pb, size);
826
                goto resync;
827
            }
828

    
829
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
830
                int k = get_byte(pb);
831
                int last = (k + get_byte(pb) - 1) & 0xFF;
832

    
833
                get_le16(pb); //flags
834

    
835
                for (; k <= last; k++)
836
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
837
                ast->has_pal= 1;
838
                goto resync;
839
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
840
                         d[2]*256+d[3] == ast->prefix /*||
841
                         (d[2] == 'd' && d[3] == 'c') ||
842
                         (d[2] == 'w' && d[3] == 'b')*/) {
843

    
844
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
845
                if(d[2]*256+d[3] == ast->prefix)
846
                    ast->prefix_count++;
847
                else{
848
                    ast->prefix= d[2]*256+d[3];
849
                    ast->prefix_count= 0;
850
                }
851

    
852
                avi->stream_index= n;
853
                ast->packet_size= size + 8;
854
                ast->remaining= size;
855

    
856
                {
857
                    uint64_t pos= url_ftell(pb) - 8;
858
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
859
                        av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
860
                    }
861
                }
862
                goto resync;
863
            }
864
        }
865
    }
866

    
867
    return -1;
868
}
869

    
870
/* XXX: We make the implicit supposition that the positions are sorted
871
   for each stream. */
872
static int avi_read_idx1(AVFormatContext *s, int size)
873
{
874
    AVIContext *avi = s->priv_data;
875
    ByteIOContext *pb = s->pb;
876
    int nb_index_entries, i;
877
    AVStream *st;
878
    AVIStream *ast;
879
    unsigned int index, tag, flags, pos, len;
880
    unsigned last_pos= -1;
881

    
882
    nb_index_entries = size / 16;
883
    if (nb_index_entries <= 0)
884
        return -1;
885

    
886
    /* Read the entries and sort them in each stream component. */
887
    for(i = 0; i < nb_index_entries; i++) {
888
        tag = get_le32(pb);
889
        flags = get_le32(pb);
890
        pos = get_le32(pb);
891
        len = get_le32(pb);
892
#if defined(DEBUG_SEEK)
893
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
894
               i, tag, flags, pos, len);
895
#endif
896
        if(i==0 && pos > avi->movi_list)
897
            avi->movi_list= 0; //FIXME better check
898
        pos += avi->movi_list;
899

    
900
        index = ((tag & 0xff) - '0') * 10;
901
        index += ((tag >> 8) & 0xff) - '0';
902
        if (index >= s->nb_streams)
903
            continue;
904
        st = s->streams[index];
905
        ast = st->priv_data;
906

    
907
#if defined(DEBUG_SEEK)
908
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
909
#endif
910
        if(last_pos == pos)
911
            avi->non_interleaved= 1;
912
        else
913
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
914
        if(ast->sample_size)
915
            ast->cum_len += len;
916
        else
917
            ast->cum_len ++;
918
        last_pos= pos;
919
    }
920
    return 0;
921
}
922

    
923
static int guess_ni_flag(AVFormatContext *s){
924
    int i;
925
    int64_t last_start=0;
926
    int64_t first_end= INT64_MAX;
927

    
928
    for(i=0; i<s->nb_streams; i++){
929
        AVStream *st = s->streams[i];
930
        int n= st->nb_index_entries;
931

    
932
        if(n <= 0)
933
            continue;
934

    
935
        if(st->index_entries[0].pos > last_start)
936
            last_start= st->index_entries[0].pos;
937
        if(st->index_entries[n-1].pos < first_end)
938
            first_end= st->index_entries[n-1].pos;
939
    }
940
    return last_start > first_end;
941
}
942

    
943
static int avi_load_index(AVFormatContext *s)
944
{
945
    AVIContext *avi = s->priv_data;
946
    ByteIOContext *pb = s->pb;
947
    uint32_t tag, size;
948
    int64_t pos= url_ftell(pb);
949

    
950
    url_fseek(pb, avi->movi_end, SEEK_SET);
951
#ifdef DEBUG_SEEK
952
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
953
#endif
954
    for(;;) {
955
        if (url_feof(pb))
956
            break;
957
        tag = get_le32(pb);
958
        size = get_le32(pb);
959
#ifdef DEBUG_SEEK
960
        printf("tag=%c%c%c%c size=0x%x\n",
961
               tag & 0xff,
962
               (tag >> 8) & 0xff,
963
               (tag >> 16) & 0xff,
964
               (tag >> 24) & 0xff,
965
               size);
966
#endif
967
        switch(tag) {
968
        case MKTAG('i', 'd', 'x', '1'):
969
            if (avi_read_idx1(s, size) < 0)
970
                goto skip;
971
            else
972
                goto the_end;
973
            break;
974
        default:
975
        skip:
976
            size += (size & 1);
977
            url_fskip(pb, size);
978
            break;
979
        }
980
    }
981
 the_end:
982
    url_fseek(pb, pos, SEEK_SET);
983
    return 0;
984
}
985

    
986
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
987
{
988
    AVIContext *avi = s->priv_data;
989
    AVStream *st;
990
    int i, index;
991
    int64_t pos;
992

    
993
    if (!avi->index_loaded) {
994
        /* we only load the index on demand */
995
        avi_load_index(s);
996
        avi->index_loaded = 1;
997
    }
998
    assert(stream_index>= 0);
999

    
1000
    st = s->streams[stream_index];
1001
    index= av_index_search_timestamp(st, timestamp, flags);
1002
    if(index<0)
1003
        return -1;
1004

    
1005
    /* find the position */
1006
    pos = st->index_entries[index].pos;
1007
    timestamp = st->index_entries[index].timestamp;
1008

    
1009
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1010

    
1011
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
1012
        /* One and only one real stream for DV in AVI, and it has video  */
1013
        /* offsets. Calling with other stream indexes should have failed */
1014
        /* the av_index_search_timestamp call above.                     */
1015
        assert(stream_index == 0);
1016

    
1017
        /* Feed the DV video stream version of the timestamp to the */
1018
        /* DV demux so it can synthesize correct timestamps.        */
1019
        dv_offset_reset(avi->dv_demux, timestamp);
1020

    
1021
        url_fseek(s->pb, pos, SEEK_SET);
1022
        avi->stream_index= -1;
1023
        return 0;
1024
    }
1025

    
1026
    for(i = 0; i < s->nb_streams; i++) {
1027
        AVStream *st2 = s->streams[i];
1028
        AVIStream *ast2 = st2->priv_data;
1029

    
1030
        ast2->packet_size=
1031
        ast2->remaining= 0;
1032

    
1033
        if (st2->nb_index_entries <= 0)
1034
            continue;
1035

    
1036
//        assert(st2->codec->block_align);
1037
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1038
        index = av_index_search_timestamp(
1039
                st2,
1040
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1041
                flags | AVSEEK_FLAG_BACKWARD);
1042
        if(index<0)
1043
            index=0;
1044

    
1045
        if(!avi->non_interleaved){
1046
            while(index>0 && st2->index_entries[index].pos > pos)
1047
                index--;
1048
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1049
                index++;
1050
        }
1051

    
1052
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1053
        /* extract the current frame number */
1054
        ast2->frame_offset = st2->index_entries[index].timestamp;
1055
        if(ast2->sample_size)
1056
            ast2->frame_offset *=ast2->sample_size;
1057
    }
1058

    
1059
    /* do the seek */
1060
    url_fseek(s->pb, pos, SEEK_SET);
1061
    avi->stream_index= -1;
1062
    return 0;
1063
}
1064

    
1065
static int avi_read_close(AVFormatContext *s)
1066
{
1067
    int i;
1068
    AVIContext *avi = s->priv_data;
1069

    
1070
    for(i=0;i<s->nb_streams;i++) {
1071
        AVStream *st = s->streams[i];
1072
        av_free(st->codec->palctrl);
1073
    }
1074

    
1075
    if (avi->dv_demux)
1076
        av_free(avi->dv_demux);
1077

    
1078
    return 0;
1079
}
1080

    
1081
static int avi_probe(AVProbeData *p)
1082
{
1083
    int i;
1084

    
1085
    /* check file header */
1086
    for(i=0; avi_headers[i][0]; i++)
1087
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1088
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1089
            return AVPROBE_SCORE_MAX;
1090

    
1091
    return 0;
1092
}
1093

    
1094
AVInputFormat avi_demuxer = {
1095
    "avi",
1096
    NULL_IF_CONFIG_SMALL("AVI format"),
1097
    sizeof(AVIContext),
1098
    avi_probe,
1099
    avi_read_header,
1100
    avi_read_packet,
1101
    avi_read_close,
1102
    avi_read_seek,
1103
};