Statistics
| Branch: | Revision:

ffmpeg / libavformat / avidec.c @ 57060f89

History | View | Annotate | Download (30.4 KB)

1
/*
2
 * AVI decoder.
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
 */
19
#include "avformat.h"
20
#include "avi.h"
21
#include "dv.h"
22
#include "riff.h"
23

    
24
#undef NDEBUG
25
#include <assert.h>
26

    
27
//#define DEBUG
28
//#define DEBUG_SEEK
29

    
30
typedef struct AVIStream {
31
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
32
                         (used to compute the pts) */
33
    int remaining;
34
    int packet_size;
35

    
36
    int scale;
37
    int rate;
38
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
39

    
40
    int64_t cum_len; /* temporary storage (used during seek) */
41

    
42
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
43
    int prefix_count;
44
} AVIStream;
45

    
46
typedef struct {
47
    int64_t  riff_end;
48
    int64_t  movi_end;
49
    offset_t movi_list;
50
    int index_loaded;
51
    int is_odml;
52
    int non_interleaved;
53
    int stream_index;
54
    DVDemuxContext* dv_demux;
55
} AVIContext;
56

    
57
static int avi_load_index(AVFormatContext *s);
58
static int guess_ni_flag(AVFormatContext *s);
59

    
60
#ifdef DEBUG
61
static void print_tag(const char *str, unsigned int tag, int size)
62
{
63
    printf("%s: tag=%c%c%c%c size=0x%x\n",
64
           str, tag & 0xff,
65
           (tag >> 8) & 0xff,
66
           (tag >> 16) & 0xff,
67
           (tag >> 24) & 0xff,
68
           size);
69
}
70
#endif
71

    
72
static int get_riff(AVIContext *avi, ByteIOContext *pb)
73
{
74
    uint32_t tag;
75
    /* check RIFF header */
76
    tag = get_le32(pb);
77

    
78
    if (tag != MKTAG('R', 'I', 'F', 'F'))
79
        return -1;
80
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
81
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
82
    tag = get_le32(pb);
83
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
84
        return -1;
85

    
86
    return 0;
87
}
88

    
89
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
90
    AVIContext *avi = s->priv_data;
91
    ByteIOContext *pb = &s->pb;
92
    int longs_pre_entry= get_le16(pb);
93
    int index_sub_type = get_byte(pb);
94
    int index_type     = get_byte(pb);
95
    int entries_in_use = get_le32(pb);
96
    int chunk_id       = get_le32(pb);
97
    int64_t base       = get_le64(pb);
98
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
99
    AVStream *st;
100
    AVIStream *ast;
101
    int i;
102
    int64_t last_pos= -1;
103

    
104
//    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n",
105
//        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
106

    
107
    if(stream_id > s->nb_streams || stream_id < 0)
108
        return -1;
109
    st= s->streams[stream_id];
110
    ast = st->priv_data;
111

    
112
    if(index_sub_type)
113
        return -1;
114

    
115
    get_le32(pb);
116

    
117
    if(index_type && longs_pre_entry != 2)
118
        return -1;
119
    if(index_type>1)
120
        return -1;
121

    
122
    for(i=0; i<entries_in_use; i++){
123
        if(index_type){
124
            int64_t pos= get_le32(pb) + base - 8;
125
            int len    = get_le32(pb);
126
            int key= len >= 0;
127
            len &= 0x7FFFFFFF;
128

    
129
//av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
130
            if(last_pos == pos || pos == base - 8)
131
                avi->non_interleaved= 1;
132
            else
133
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
134

    
135
            if(ast->sample_size)
136
                ast->cum_len += len / ast->sample_size;
137
            else
138
                ast->cum_len ++;
139
            last_pos= pos;
140
        }else{
141
            int64_t offset, pos;
142
            int duration;
143
            offset = get_le64(pb);
144
            get_le32(pb);       /* size */
145
            duration = get_le32(pb);
146
            pos = url_ftell(pb);
147

    
148
            url_fseek(pb, offset+8, SEEK_SET);
149
            read_braindead_odml_indx(s, frame_num);
150
            frame_num += duration;
151

    
152
            url_fseek(pb, pos, SEEK_SET);
153
        }
154
    }
155
    return 0;
156
}
157

    
158
static void clean_index(AVFormatContext *s){
159
    int i, j;
160

    
161
    for(i=0; i<s->nb_streams; i++){
162
        AVStream *st = s->streams[i];
163
        AVIStream *ast = st->priv_data;
164
        int n= st->nb_index_entries;
165
        int max= ast->sample_size;
166
        int64_t pos, size, ts;
167

    
168
        if(n != 1 || ast->sample_size==0)
169
            continue;
170

    
171
        while(max < 1024) max+=max;
172

    
173
        pos= st->index_entries[0].pos;
174
        size= st->index_entries[0].size;
175
        ts= st->index_entries[0].timestamp;
176

    
177
        for(j=0; j<size; j+=max){
178
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
179
        }
180
    }
181
}
182

    
183
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
184
{
185
    offset_t i = url_ftell(pb);
186
    size += (size & 1);
187
    get_strz(pb, buf, maxlen);
188
    url_fseek(pb, i+size, SEEK_SET);
189
    return 0;
190
}
191

    
192
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
193
{
194
    AVIContext *avi = s->priv_data;
195
    ByteIOContext *pb = &s->pb;
196
    uint32_t tag, tag1, handler;
197
    int codec_type, stream_index, frame_period, bit_rate;
198
    unsigned int size, nb_frames;
199
    int i, n;
200
    AVStream *st;
201
    AVIStream *ast = NULL;
202
    int xan_video = 0;  /* hack to support Xan A/V */
203

    
204
    avi->stream_index= -1;
205

    
206
    if (get_riff(avi, pb) < 0)
207
        return -1;
208

    
209
    /* first list tag */
210
    stream_index = -1;
211
    codec_type = -1;
212
    frame_period = 0;
213
    for(;;) {
214
        if (url_feof(pb))
215
            goto fail;
216
        tag = get_le32(pb);
217
        size = get_le32(pb);
218
#ifdef DEBUG
219
        print_tag("tag", tag, size);
220
#endif
221

    
222
        switch(tag) {
223
        case MKTAG('L', 'I', 'S', 'T'):
224
            /* ignored, except when start of video packets */
225
            tag1 = get_le32(pb);
226
#ifdef DEBUG
227
            print_tag("list", tag1, 0);
228
#endif
229
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
230
                avi->movi_list = url_ftell(pb) - 4;
231
                if(size) avi->movi_end = avi->movi_list + size;
232
                else     avi->movi_end = url_fsize(pb);
233
#ifdef DEBUG
234
                printf("movi end=%Lx\n", avi->movi_end);
235
#endif
236
                goto end_of_header;
237
            }
238
            break;
239
        case MKTAG('d', 'm', 'l', 'h'):
240
            avi->is_odml = 1;
241
            url_fskip(pb, size + (size & 1));
242
            break;
243
        case MKTAG('a', 'v', 'i', 'h'):
244
            /* avi header */
245
            /* using frame_period is bad idea */
246
            frame_period = get_le32(pb);
247
            bit_rate = get_le32(pb) * 8;
248
            get_le32(pb);
249
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
250

    
251
            url_fskip(pb, 2 * 4);
252
            n = get_le32(pb);
253
            for(i=0;i<n;i++) {
254
                AVIStream *ast;
255
                st = av_new_stream(s, i);
256
                if (!st)
257
                    goto fail;
258

    
259
                ast = av_mallocz(sizeof(AVIStream));
260
                if (!ast)
261
                    goto fail;
262
                st->priv_data = ast;
263
            }
264
            url_fskip(pb, size - 7 * 4);
265
            break;
266
        case MKTAG('s', 't', 'r', 'h'):
267
            /* stream header */
268
            stream_index++;
269
            tag1 = get_le32(pb);
270
            handler = get_le32(pb); /* codec tag */
271
#ifdef DEBUG
272
        print_tag("strh", tag1, -1);
273
#endif
274
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
275
                /*
276
                 * After some consideration -- I don't think we
277
                 * have to support anything but DV in a type1 AVIs.
278
                 */
279
                if (s->nb_streams != 1)
280
                    goto fail;
281

    
282
                if (handler != MKTAG('d', 'v', 's', 'd') &&
283
                    handler != MKTAG('d', 'v', 'h', 'd') &&
284
                    handler != MKTAG('d', 'v', 's', 'l'))
285
                   goto fail;
286

    
287
                ast = s->streams[0]->priv_data;
288
                av_freep(&s->streams[0]->codec->extradata);
289
                av_freep(&s->streams[0]);
290
                s->nb_streams = 0;
291
                avi->dv_demux = dv_init_demux(s);
292
                if (!avi->dv_demux)
293
                    goto fail;
294
                s->streams[0]->priv_data = ast;
295
                url_fskip(pb, 3 * 4);
296
                ast->scale = get_le32(pb);
297
                ast->rate = get_le32(pb);
298
                stream_index = s->nb_streams - 1;
299
                url_fskip(pb, size - 7*4);
300
                break;
301
            }
302

    
303
            if (stream_index >= s->nb_streams) {
304
                url_fskip(pb, size - 8);
305
                /* ignore padding stream */
306
                if (tag1 == MKTAG('p', 'a', 'd', 's'))
307
                    stream_index--;
308
                break;
309
            }
310
            st = s->streams[stream_index];
311
            ast = st->priv_data;
312
            st->codec->stream_codec_tag= handler;
313

    
314
            get_le32(pb); /* flags */
315
            get_le16(pb); /* priority */
316
            get_le16(pb); /* language */
317
            get_le32(pb); /* initial frame */
318
            ast->scale = get_le32(pb);
319
            ast->rate = get_le32(pb);
320
            if(ast->scale && ast->rate){
321
            }else if(frame_period){
322
                ast->rate = 1000000;
323
                ast->scale = frame_period;
324
            }else{
325
                ast->rate = 25;
326
                ast->scale = 1;
327
            }
328
            av_set_pts_info(st, 64, ast->scale, ast->rate);
329

    
330
            ast->cum_len=get_le32(pb); /* start */
331
            nb_frames = get_le32(pb);
332

    
333
            st->start_time = 0;
334
            st->duration = nb_frames;
335
            get_le32(pb); /* buffer size */
336
            get_le32(pb); /* quality */
337
            ast->sample_size = get_le32(pb); /* sample ssize */
338
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
339

    
340
            switch(tag1) {
341
            case MKTAG('v', 'i', 'd', 's'):
342
                codec_type = CODEC_TYPE_VIDEO;
343

    
344
                ast->sample_size = 0;
345
                break;
346
            case MKTAG('a', 'u', 'd', 's'):
347
                codec_type = CODEC_TYPE_AUDIO;
348
                break;
349
            case MKTAG('t', 'x', 't', 's'):
350
                //FIXME
351
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
352
                break;
353
            case MKTAG('p', 'a', 'd', 's'):
354
                codec_type = CODEC_TYPE_UNKNOWN;
355
                stream_index--;
356
                break;
357
            default:
358
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
359
                goto fail;
360
            }
361
            ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
362
            url_fskip(pb, size - 12 * 4);
363
            break;
364
        case MKTAG('s', 't', 'r', 'f'):
365
            /* stream header */
366
            if (stream_index >= s->nb_streams || avi->dv_demux) {
367
                url_fskip(pb, size);
368
            } else {
369
                st = s->streams[stream_index];
370
                switch(codec_type) {
371
                case CODEC_TYPE_VIDEO:
372
                    get_le32(pb); /* size */
373
                    st->codec->width = get_le32(pb);
374
                    st->codec->height = get_le32(pb);
375
                    get_le16(pb); /* panes */
376
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
377
                    tag1 = get_le32(pb);
378
                    get_le32(pb); /* ImageSize */
379
                    get_le32(pb); /* XPelsPerMeter */
380
                    get_le32(pb); /* YPelsPerMeter */
381
                    get_le32(pb); /* ClrUsed */
382
                    get_le32(pb); /* ClrImportant */
383

    
384
                 if(size > 10*4 && size<(1<<30)){
385
                    st->codec->extradata_size= size - 10*4;
386
                    st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
387
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
388
                 }
389

    
390
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
391
                        get_byte(pb);
392

    
393
                    /* Extract palette from extradata if bpp <= 8 */
394
                    /* This code assumes that extradata contains only palette */
395
                    /* This is true for all paletted codecs implemented in ffmpeg */
396
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
397
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
398
#ifdef WORDS_BIGENDIAN
399
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
400
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
401
#else
402
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
403
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
404
#endif
405
                        st->codec->palctrl->palette_changed = 1;
406
                    }
407

    
408
#ifdef DEBUG
409
                    print_tag("video", tag1, 0);
410
#endif
411
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
412
                    st->codec->codec_tag = tag1;
413
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
414
                    if (st->codec->codec_id == CODEC_ID_XAN_WC4)
415
                        xan_video = 1;
416
                    st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts
417
//                    url_fskip(pb, size - 5 * 4);
418
                    break;
419
                case CODEC_TYPE_AUDIO:
420
                    get_wav_header(pb, st->codec, size);
421
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
422
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
423
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
424
                        url_fskip(pb, 1);
425
                    /* special case time: To support Xan DPCM, hardcode
426
                     * the format if Xxan is the video codec */
427
                    st->need_parsing = 1;
428
                    /* force parsing as several audio frames can be in
429
                       one packet */
430
                    if (xan_video)
431
                        st->codec->codec_id = CODEC_ID_XAN_DPCM;
432
                    break;
433
                default:
434
                    st->codec->codec_type = CODEC_TYPE_DATA;
435
                    st->codec->codec_id= CODEC_ID_NONE;
436
                    st->codec->codec_tag= 0;
437
                    url_fskip(pb, size);
438
                    break;
439
                }
440
            }
441
            break;
442
        case MKTAG('i', 'n', 'd', 'x'):
443
            i= url_ftell(pb);
444
            if(!url_is_streamed(pb)){
445
                read_braindead_odml_indx(s, 0);
446
                avi->index_loaded=1;
447
            }
448
            url_fseek(pb, i+size, SEEK_SET);
449
            break;
450
        case MKTAG('I', 'N', 'A', 'M'):
451
            avi_read_tag(pb, s->title, sizeof(s->title), size);
452
            break;
453
        case MKTAG('I', 'A', 'R', 'T'):
454
            avi_read_tag(pb, s->author, sizeof(s->author), size);
455
            break;
456
        case MKTAG('I', 'C', 'O', 'P'):
457
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
458
            break;
459
        case MKTAG('I', 'C', 'M', 'T'):
460
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
461
            break;
462
        case MKTAG('I', 'G', 'N', 'R'):
463
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
464
            break;
465
        default:
466
            /* skip tag */
467
            size += (size & 1);
468
            url_fskip(pb, size);
469
            break;
470
        }
471
    }
472
 end_of_header:
473
    /* check stream number */
474
    if (stream_index != s->nb_streams - 1) {
475
    fail:
476
        for(i=0;i<s->nb_streams;i++) {
477
            av_freep(&s->streams[i]->codec->extradata);
478
            av_freep(&s->streams[i]);
479
        }
480
        return -1;
481
    }
482

    
483
    if(!avi->index_loaded && !url_is_streamed(pb))
484
        avi_load_index(s);
485
    avi->index_loaded = 1;
486
    avi->non_interleaved |= guess_ni_flag(s);
487
    if(avi->non_interleaved)
488
        clean_index(s);
489

    
490
    return 0;
491
}
492

    
493
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
494
{
495
    AVIContext *avi = s->priv_data;
496
    ByteIOContext *pb = &s->pb;
497
    int n, d[8], size;
498
    offset_t i, sync;
499
    void* dstr;
500

    
501
    if (avi->dv_demux) {
502
        size = dv_get_packet(avi->dv_demux, pkt);
503
        if (size >= 0)
504
            return size;
505
    }
506

    
507
    if(avi->non_interleaved){
508
        int best_stream_index = 0;
509
        AVStream *best_st= NULL;
510
        AVIStream *best_ast;
511
        int64_t best_ts= INT64_MAX;
512
        int i;
513

    
514
        for(i=0; i<s->nb_streams; i++){
515
            AVStream *st = s->streams[i];
516
            AVIStream *ast = st->priv_data;
517
            int64_t ts= ast->frame_offset;
518

    
519
            if(ast->sample_size)
520
                ts /= ast->sample_size;
521
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
522

    
523
//            av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
524
            if(ts < best_ts){
525
                best_ts= ts;
526
                best_st= st;
527
                best_stream_index= i;
528
            }
529
        }
530
        best_ast = best_st->priv_data;
531
        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
532
        if(best_ast->remaining)
533
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
534
        else
535
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
536

    
537
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
538
        if(i>=0){
539
            int64_t pos= best_st->index_entries[i].pos;
540
            pos += best_ast->packet_size - best_ast->remaining;
541
            url_fseek(&s->pb, pos + 8, SEEK_SET);
542
//        av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
543

    
544
            assert(best_ast->remaining <= best_ast->packet_size);
545

    
546
            avi->stream_index= best_stream_index;
547
            if(!best_ast->remaining)
548
                best_ast->packet_size=
549
                best_ast->remaining= best_st->index_entries[i].size;
550
        }
551
    }
552

    
553
resync:
554
    if(avi->stream_index >= 0){
555
        AVStream *st= s->streams[ avi->stream_index ];
556
        AVIStream *ast= st->priv_data;
557
        int size;
558

    
559
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
560
            size= INT_MAX;
561
        else if(ast->sample_size < 32)
562
            size= 64*ast->sample_size;
563
        else
564
            size= ast->sample_size;
565

    
566
        if(size > ast->remaining)
567
            size= ast->remaining;
568
        av_get_packet(pb, pkt, size);
569

    
570
        if (avi->dv_demux) {
571
            dstr = pkt->destruct;
572
            size = dv_produce_packet(avi->dv_demux, pkt,
573
                                    pkt->data, pkt->size);
574
            pkt->destruct = dstr;
575
            pkt->flags |= PKT_FLAG_KEY;
576
        } else {
577
            /* XXX: how to handle B frames in avi ? */
578
            pkt->dts = ast->frame_offset;
579
//                pkt->dts += ast->start;
580
            if(ast->sample_size)
581
                pkt->dts /= ast->sample_size;
582
//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%Ld %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);
583
            pkt->stream_index = avi->stream_index;
584

    
585
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
586
                if(st->index_entries){
587
                    AVIndexEntry *e;
588
                    int index;
589

    
590
                    index= av_index_search_timestamp(st, pkt->dts, 0);
591
                    e= &st->index_entries[index];
592

    
593
                    if(index >= 0 && e->timestamp == ast->frame_offset){
594
                        if (e->flags & AVINDEX_KEYFRAME)
595
                            pkt->flags |= PKT_FLAG_KEY;
596
                    }
597
                } else {
598
                    /* if no index, better to say that all frames
599
                        are key frames */
600
                    pkt->flags |= PKT_FLAG_KEY;
601
                }
602
            } else {
603
                pkt->flags |= PKT_FLAG_KEY;
604
            }
605
            if(ast->sample_size)
606
                ast->frame_offset += pkt->size;
607
            else
608
                ast->frame_offset++;
609
        }
610
        ast->remaining -= size;
611
        if(!ast->remaining){
612
            avi->stream_index= -1;
613
            ast->packet_size= 0;
614
            if (size & 1) {
615
                get_byte(pb);
616
                size++;
617
            }
618
        }
619

    
620
        return size;
621
    }
622

    
623
    memset(d, -1, sizeof(int)*8);
624
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
625
        int j;
626

    
627
        if (i >= avi->movi_end) {
628
            if (avi->is_odml) {
629
                url_fskip(pb, avi->riff_end - i);
630
                avi->riff_end = avi->movi_end = url_fsize(pb);
631
            } else
632
                break;
633
        }
634

    
635
        for(j=0; j<7; j++)
636
            d[j]= d[j+1];
637
        d[7]= get_byte(pb);
638

    
639
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
640

    
641
        if(    d[2] >= '0' && d[2] <= '9'
642
            && d[3] >= '0' && d[3] <= '9'){
643
            n= (d[2] - '0') * 10 + (d[3] - '0');
644
        }else{
645
            n= 100; //invalid stream id
646
        }
647
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
648
        if(i + size > avi->movi_end || d[0]<0)
649
            continue;
650

    
651
        //parse ix##
652
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
653
        //parse JUNK
654
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
655
            url_fskip(pb, size);
656
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
657
            goto resync;
658
        }
659

    
660
        if(    d[0] >= '0' && d[0] <= '9'
661
            && d[1] >= '0' && d[1] <= '9'){
662
            n= (d[0] - '0') * 10 + (d[1] - '0');
663
        }else{
664
            n= 100; //invalid stream id
665
        }
666

    
667
        //parse ##dc/##wb
668
        if(n < s->nb_streams){
669
          AVStream *st;
670
          AVIStream *ast;
671
          st = s->streams[n];
672
          ast = st->priv_data;
673

    
674
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
675
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
676
             || st->discard >= AVDISCARD_ALL){
677
                if(ast->sample_size) ast->frame_offset += pkt->size;
678
                else                 ast->frame_offset++;
679
                url_fskip(pb, size);
680
                goto resync;
681
          }
682

    
683
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
684
                d[2]*256+d[3] == ast->prefix /*||
685
                (d[2] == 'd' && d[3] == 'c') ||
686
                (d[2] == 'w' && d[3] == 'b')*/) {
687

    
688
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
689
            if(d[2]*256+d[3] == ast->prefix)
690
                ast->prefix_count++;
691
            else{
692
                ast->prefix= d[2]*256+d[3];
693
                ast->prefix_count= 0;
694
            }
695

    
696
            avi->stream_index= n;
697
            ast->packet_size= size + 8;
698
            ast->remaining= size;
699
            goto resync;
700
          }
701
        }
702
        /* palette changed chunk */
703
        if (   d[0] >= '0' && d[0] <= '9'
704
            && d[1] >= '0' && d[1] <= '9'
705
            && ((d[2] == 'p' && d[3] == 'c'))
706
            && n < s->nb_streams && i + size <= avi->movi_end) {
707

    
708
            AVStream *st;
709
            int first, clr, flags, k, p;
710

    
711
            st = s->streams[n];
712

    
713
            first = get_byte(pb);
714
            clr = get_byte(pb);
715
            if(!clr) /* all 256 colors used */
716
                clr = 256;
717
            flags = get_le16(pb);
718
            p = 4;
719
            for (k = first; k < clr + first; k++) {
720
                int r, g, b;
721
                r = get_byte(pb);
722
                g = get_byte(pb);
723
                b = get_byte(pb);
724
                    get_byte(pb);
725
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
726
            }
727
            st->codec->palctrl->palette_changed = 1;
728
            goto resync;
729
        }
730

    
731
    }
732

    
733
    return -1;
734
}
735

    
736
/* XXX: we make the implicit supposition that the position are sorted
737
   for each stream */
738
static int avi_read_idx1(AVFormatContext *s, int size)
739
{
740
    AVIContext *avi = s->priv_data;
741
    ByteIOContext *pb = &s->pb;
742
    int nb_index_entries, i;
743
    AVStream *st;
744
    AVIStream *ast;
745
    unsigned int index, tag, flags, pos, len;
746
    unsigned last_pos= -1;
747

    
748
    nb_index_entries = size / 16;
749
    if (nb_index_entries <= 0)
750
        return -1;
751

    
752
    /* read the entries and sort them in each stream component */
753
    for(i = 0; i < nb_index_entries; i++) {
754
        tag = get_le32(pb);
755
        flags = get_le32(pb);
756
        pos = get_le32(pb);
757
        len = get_le32(pb);
758
#if defined(DEBUG_SEEK)
759
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
760
               i, tag, flags, pos, len);
761
#endif
762
        if(i==0 && pos > avi->movi_list)
763
            avi->movi_list= 0; //FIXME better check
764
        pos += avi->movi_list;
765

    
766
        index = ((tag & 0xff) - '0') * 10;
767
        index += ((tag >> 8) & 0xff) - '0';
768
        if (index >= s->nb_streams)
769
            continue;
770
        st = s->streams[index];
771
        ast = st->priv_data;
772

    
773
#if defined(DEBUG_SEEK)
774
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
775
#endif
776
        if(last_pos == pos)
777
            avi->non_interleaved= 1;
778
        else
779
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
780
        if(ast->sample_size)
781
            ast->cum_len += len / ast->sample_size;
782
        else
783
            ast->cum_len ++;
784
        last_pos= pos;
785
    }
786
    return 0;
787
}
788

    
789
static int guess_ni_flag(AVFormatContext *s){
790
    int i;
791
    int64_t last_start=0;
792
    int64_t first_end= INT64_MAX;
793

    
794
    for(i=0; i<s->nb_streams; i++){
795
        AVStream *st = s->streams[i];
796
        int n= st->nb_index_entries;
797

    
798
        if(n <= 0)
799
            continue;
800

    
801
        if(st->index_entries[0].pos > last_start)
802
            last_start= st->index_entries[0].pos;
803
        if(st->index_entries[n-1].pos < first_end)
804
            first_end= st->index_entries[n-1].pos;
805
    }
806
    return last_start > first_end;
807
}
808

    
809
static int avi_load_index(AVFormatContext *s)
810
{
811
    AVIContext *avi = s->priv_data;
812
    ByteIOContext *pb = &s->pb;
813
    uint32_t tag, size;
814
    offset_t pos= url_ftell(pb);
815

    
816
    url_fseek(pb, avi->movi_end, SEEK_SET);
817
#ifdef DEBUG_SEEK
818
    printf("movi_end=0x%llx\n", avi->movi_end);
819
#endif
820
    for(;;) {
821
        if (url_feof(pb))
822
            break;
823
        tag = get_le32(pb);
824
        size = get_le32(pb);
825
#ifdef DEBUG_SEEK
826
        printf("tag=%c%c%c%c size=0x%x\n",
827
               tag & 0xff,
828
               (tag >> 8) & 0xff,
829
               (tag >> 16) & 0xff,
830
               (tag >> 24) & 0xff,
831
               size);
832
#endif
833
        switch(tag) {
834
        case MKTAG('i', 'd', 'x', '1'):
835
            if (avi_read_idx1(s, size) < 0)
836
                goto skip;
837
            else
838
                goto the_end;
839
            break;
840
        default:
841
        skip:
842
            size += (size & 1);
843
            url_fskip(pb, size);
844
            break;
845
        }
846
    }
847
 the_end:
848
    url_fseek(pb, pos, SEEK_SET);
849
    return 0;
850
}
851

    
852
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
853
{
854
    AVIContext *avi = s->priv_data;
855
    AVStream *st;
856
    int i, index;
857
    int64_t pos;
858

    
859
    if (!avi->index_loaded) {
860
        /* we only load the index on demand */
861
        avi_load_index(s);
862
        avi->index_loaded = 1;
863
    }
864
    assert(stream_index>= 0);
865

    
866
    st = s->streams[stream_index];
867
    index= av_index_search_timestamp(st, timestamp, flags);
868
    if(index<0)
869
        return -1;
870

    
871
    /* find the position */
872
    pos = st->index_entries[index].pos;
873
    timestamp = st->index_entries[index].timestamp;
874

    
875
//    av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
876

    
877
    for(i = 0; i < s->nb_streams; i++) {
878
        AVStream *st2 = s->streams[i];
879
        AVIStream *ast2 = st2->priv_data;
880

    
881
        ast2->packet_size=
882
        ast2->remaining= 0;
883

    
884
        if (st2->nb_index_entries <= 0)
885
            continue;
886

    
887
//        assert(st2->codec->block_align);
888
        assert(st2->time_base.den == ast2->rate);
889
        assert(st2->time_base.num == ast2->scale);
890
        index = av_index_search_timestamp(
891
                st2,
892
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
893
                flags | AVSEEK_FLAG_BACKWARD);
894
        if(index<0)
895
            index=0;
896

    
897
        if(!avi->non_interleaved){
898
            while(index>0 && st2->index_entries[index].pos > pos)
899
                index--;
900
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
901
                index++;
902
        }
903

    
904
//        av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
905
        /* extract the current frame number */
906
        ast2->frame_offset = st2->index_entries[index].timestamp;
907
        if(ast2->sample_size)
908
            ast2->frame_offset *=ast2->sample_size;
909
    }
910

    
911
    if (avi->dv_demux)
912
        dv_flush_audio_packets(avi->dv_demux);
913
    /* do the seek */
914
    url_fseek(&s->pb, pos, SEEK_SET);
915
    avi->stream_index= -1;
916
    return 0;
917
}
918

    
919
static int avi_read_close(AVFormatContext *s)
920
{
921
    int i;
922
    AVIContext *avi = s->priv_data;
923

    
924
    for(i=0;i<s->nb_streams;i++) {
925
        AVStream *st = s->streams[i];
926
        AVIStream *ast = st->priv_data;
927
        av_free(ast);
928
        av_free(st->codec->palctrl);
929
    }
930

    
931
    if (avi->dv_demux)
932
        av_free(avi->dv_demux);
933

    
934
    return 0;
935
}
936

    
937
static int avi_probe(AVProbeData *p)
938
{
939
    /* check file header */
940
    if (p->buf_size <= 32)
941
        return 0;
942
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
943
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
944
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
945
        p->buf[10] == 'I' && p->buf[11] == ' ')
946
        return AVPROBE_SCORE_MAX;
947
    else
948
        return 0;
949
}
950

    
951
AVInputFormat avi_demuxer = {
952
    "avi",
953
    "avi format",
954
    sizeof(AVIContext),
955
    avi_probe,
956
    avi_read_header,
957
    avi_read_packet,
958
    avi_read_close,
959
    avi_read_seek,
960
};