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ffmpeg / libavformat / avidec.c @ a5e9102b

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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

    
23
#undef NDEBUG
24
#include <assert.h>
25

    
26
//#define DEBUG
27
//#define DEBUG_SEEK
28

    
29
typedef struct AVIStream {
30
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
31
                         (used to compute the pts) */
32
    int remaining;
33
    int packet_size;
34

    
35
    int scale;
36
    int rate;
37
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
38

    
39
    int64_t cum_len; /* temporary storage (used during seek) */
40

    
41
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
42
    int prefix_count;
43
} AVIStream;
44

    
45
typedef struct {
46
    int64_t  riff_end;
47
    int64_t  movi_end;
48
    offset_t movi_list;
49
    int index_loaded;
50
    int is_odml;
51
    int non_interleaved;
52
    int stream_index;
53
    DVDemuxContext* dv_demux;
54
} AVIContext;
55

    
56
static int avi_load_index(AVFormatContext *s);
57
static int guess_ni_flag(AVFormatContext *s);
58

    
59
#ifdef DEBUG
60
static void print_tag(const char *str, unsigned int tag, int size)
61
{
62
    printf("%s: tag=%c%c%c%c size=0x%x\n",
63
           str, tag & 0xff,
64
           (tag >> 8) & 0xff,
65
           (tag >> 16) & 0xff,
66
           (tag >> 24) & 0xff,
67
           size);
68
}
69
#endif
70

    
71
static int get_riff(AVIContext *avi, ByteIOContext *pb)
72
{
73
    uint32_t tag;
74
    /* check RIFF header */
75
    tag = get_le32(pb);
76

    
77
    if (tag != MKTAG('R', 'I', 'F', 'F'))
78
        return -1;
79
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
80
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
81
    tag = get_le32(pb);
82
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
83
        return -1;
84

    
85
    return 0;
86
}
87

    
88
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
89
    AVIContext *avi = s->priv_data;
90
    ByteIOContext *pb = &s->pb;
91
    int longs_pre_entry= get_le16(pb);
92
    int index_sub_type = get_byte(pb);
93
    int index_type     = get_byte(pb);
94
    int entries_in_use = get_le32(pb);
95
    int chunk_id       = get_le32(pb);
96
    int64_t base       = get_le64(pb);
97
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
98
    AVStream *st;
99
    AVIStream *ast;
100
    int i;
101
    int64_t last_pos= -1;
102

    
103
//    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n",
104
//        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
105

    
106
    if(stream_id > s->nb_streams || stream_id < 0)
107
        return -1;
108
    st= s->streams[stream_id];
109
    ast = st->priv_data;
110

    
111
    if(index_sub_type)
112
        return -1;
113

    
114
    get_le32(pb);
115

    
116
    if(index_type && longs_pre_entry != 2)
117
        return -1;
118
    if(index_type>1)
119
        return -1;
120

    
121
    for(i=0; i<entries_in_use; i++){
122
        if(index_type){
123
            int64_t pos= get_le32(pb) + base - 8;
124
            int len    = get_le32(pb);
125
            int key= len >= 0;
126
            len &= 0x7FFFFFFF;
127

    
128
//av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
129
            if(last_pos == pos || pos == base - 8)
130
                avi->non_interleaved= 1;
131
            else
132
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
133

    
134
            if(ast->sample_size)
135
                ast->cum_len += len / ast->sample_size;
136
            else
137
                ast->cum_len ++;
138
            last_pos= pos;
139
        }else{
140
            int64_t offset= get_le64(pb);
141
            int size      = get_le32(pb);
142
            int duration  = get_le32(pb);
143
            int64_t pos= url_ftell(pb);
144

    
145
            url_fseek(pb, offset+8, SEEK_SET);
146
            read_braindead_odml_indx(s, frame_num);
147
            frame_num += duration;
148

    
149
            url_fseek(pb, pos, SEEK_SET);
150
        }
151
    }
152
    return 0;
153
}
154

    
155
static void clean_index(AVFormatContext *s){
156
    int i, j;
157

    
158
    for(i=0; i<s->nb_streams; i++){
159
        AVStream *st = s->streams[i];
160
        AVIStream *ast = st->priv_data;
161
        int n= st->nb_index_entries;
162
        int max= ast->sample_size;
163
        int64_t pos, size, ts;
164

    
165
        if(n != 1 || ast->sample_size==0)
166
            continue;
167

    
168
        while(max < 1024) max+=max;
169

    
170
        pos= st->index_entries[0].pos;
171
        size= st->index_entries[0].size;
172
        ts= st->index_entries[0].timestamp;
173

    
174
        for(j=0; j<size; j+=max){
175
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
176
        }
177
    }
178
}
179

    
180
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
181
{
182
    AVIContext *avi = s->priv_data;
183
    ByteIOContext *pb = &s->pb;
184
    uint32_t tag, tag1, handler;
185
    int codec_type, stream_index, frame_period, bit_rate;
186
    unsigned int size, nb_frames;
187
    int i, n;
188
    AVStream *st;
189
    AVIStream *ast;
190
    int xan_video = 0;  /* hack to support Xan A/V */
191

    
192
    avi->stream_index= -1;
193

    
194
    if (get_riff(avi, pb) < 0)
195
        return -1;
196

    
197
    /* first list tag */
198
    stream_index = -1;
199
    codec_type = -1;
200
    frame_period = 0;
201
    for(;;) {
202
        if (url_feof(pb))
203
            goto fail;
204
        tag = get_le32(pb);
205
        size = get_le32(pb);
206
#ifdef DEBUG
207
        print_tag("tag", tag, size);
208
#endif
209

    
210
        switch(tag) {
211
        case MKTAG('L', 'I', 'S', 'T'):
212
            /* ignored, except when start of video packets */
213
            tag1 = get_le32(pb);
214
#ifdef DEBUG
215
            print_tag("list", tag1, 0);
216
#endif
217
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
218
                avi->movi_list = url_ftell(pb) - 4;
219
                if(size) avi->movi_end = avi->movi_list + size;
220
                else     avi->movi_end = url_fsize(pb);
221
#ifdef DEBUG
222
                printf("movi end=%Lx\n", avi->movi_end);
223
#endif
224
                goto end_of_header;
225
            }
226
            break;
227
        case MKTAG('d', 'm', 'l', 'h'):
228
            avi->is_odml = 1;
229
            url_fskip(pb, size + (size & 1));
230
            break;
231
        case MKTAG('a', 'v', 'i', 'h'):
232
            /* avi header */
233
            /* using frame_period is bad idea */
234
            frame_period = get_le32(pb);
235
            bit_rate = get_le32(pb) * 8;
236
            get_le32(pb);
237
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
238

    
239
            url_fskip(pb, 2 * 4);
240
            n = get_le32(pb);
241
            for(i=0;i<n;i++) {
242
                AVIStream *ast;
243
                st = av_new_stream(s, i);
244
                if (!st)
245
                    goto fail;
246

    
247
                ast = av_mallocz(sizeof(AVIStream));
248
                if (!ast)
249
                    goto fail;
250
                st->priv_data = ast;
251
            }
252
            url_fskip(pb, size - 7 * 4);
253
            break;
254
        case MKTAG('s', 't', 'r', 'h'):
255
            /* stream header */
256
            stream_index++;
257
            tag1 = get_le32(pb);
258
            handler = get_le32(pb); /* codec tag */
259
#ifdef DEBUG
260
        print_tag("strh", tag1, -1);
261
#endif
262
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
263
                /*
264
                 * After some consideration -- I don't think we
265
                 * have to support anything but DV in a type1 AVIs.
266
                 */
267
                if (s->nb_streams != 1)
268
                    goto fail;
269

    
270
                if (handler != MKTAG('d', 'v', 's', 'd') &&
271
                    handler != MKTAG('d', 'v', 'h', 'd') &&
272
                    handler != MKTAG('d', 'v', 's', 'l'))
273
                   goto fail;
274

    
275
                ast = s->streams[0]->priv_data;
276
                av_freep(&s->streams[0]->codec->extradata);
277
                av_freep(&s->streams[0]);
278
                s->nb_streams = 0;
279
                avi->dv_demux = dv_init_demux(s);
280
                if (!avi->dv_demux)
281
                    goto fail;
282
                s->streams[0]->priv_data = ast;
283
                url_fskip(pb, 3 * 4);
284
                ast->scale = get_le32(pb);
285
                ast->rate = get_le32(pb);
286
                stream_index = s->nb_streams - 1;
287
                url_fskip(pb, size - 7*4);
288
                break;
289
            }
290

    
291
            if (stream_index >= s->nb_streams) {
292
                url_fskip(pb, size - 8);
293
                /* ignore padding stream */
294
                if (tag1 == MKTAG('p', 'a', 'd', 's'))
295
                    stream_index--;
296
                break;
297
            }
298
            st = s->streams[stream_index];
299
            ast = st->priv_data;
300
            st->codec->stream_codec_tag= handler;
301

    
302
            get_le32(pb); /* flags */
303
            get_le16(pb); /* priority */
304
            get_le16(pb); /* language */
305
            get_le32(pb); /* initial frame */
306
            ast->scale = get_le32(pb);
307
            ast->rate = get_le32(pb);
308
            if(ast->scale && ast->rate){
309
            }else if(frame_period){
310
                ast->rate = 1000000;
311
                ast->scale = frame_period;
312
            }else{
313
                ast->rate = 25;
314
                ast->scale = 1;
315
            }
316
            av_set_pts_info(st, 64, ast->scale, ast->rate);
317

    
318
            ast->cum_len=get_le32(pb); /* start */
319
            nb_frames = get_le32(pb);
320

    
321
            st->start_time = 0;
322
            st->duration = nb_frames;
323
            get_le32(pb); /* buffer size */
324
            get_le32(pb); /* quality */
325
            ast->sample_size = get_le32(pb); /* sample ssize */
326
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
327

    
328
            switch(tag1) {
329
            case MKTAG('v', 'i', 'd', 's'):
330
                codec_type = CODEC_TYPE_VIDEO;
331

    
332
                ast->sample_size = 0;
333
                break;
334
            case MKTAG('a', 'u', 'd', 's'):
335
                codec_type = CODEC_TYPE_AUDIO;
336
                break;
337
            case MKTAG('t', 'x', 't', 's'):
338
                //FIXME
339
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
340
                break;
341
            case MKTAG('p', 'a', 'd', 's'):
342
                codec_type = CODEC_TYPE_UNKNOWN;
343
                stream_index--;
344
                break;
345
            default:
346
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
347
                goto fail;
348
            }
349
            ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
350
            url_fskip(pb, size - 12 * 4);
351
            break;
352
        case MKTAG('s', 't', 'r', 'f'):
353
            /* stream header */
354
            if (stream_index >= s->nb_streams || avi->dv_demux) {
355
                url_fskip(pb, size);
356
            } else {
357
                st = s->streams[stream_index];
358
                switch(codec_type) {
359
                case CODEC_TYPE_VIDEO:
360
                    get_le32(pb); /* size */
361
                    st->codec->width = get_le32(pb);
362
                    st->codec->height = get_le32(pb);
363
                    get_le16(pb); /* panes */
364
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
365
                    tag1 = get_le32(pb);
366
                    get_le32(pb); /* ImageSize */
367
                    get_le32(pb); /* XPelsPerMeter */
368
                    get_le32(pb); /* YPelsPerMeter */
369
                    get_le32(pb); /* ClrUsed */
370
                    get_le32(pb); /* ClrImportant */
371

    
372
                 if(size > 10*4 && size<(1<<30)){
373
                    st->codec->extradata_size= size - 10*4;
374
                    st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
375
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
376
                 }
377

    
378
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
379
                        get_byte(pb);
380

    
381
                    /* Extract palette from extradata if bpp <= 8 */
382
                    /* This code assumes that extradata contains only palette */
383
                    /* This is true for all paletted codecs implemented in ffmpeg */
384
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
385
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
386
#ifdef WORDS_BIGENDIAN
387
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
388
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
389
#else
390
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
391
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
392
#endif
393
                        st->codec->palctrl->palette_changed = 1;
394
                    }
395

    
396
#ifdef DEBUG
397
                    print_tag("video", tag1, 0);
398
#endif
399
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
400
                    st->codec->codec_tag = tag1;
401
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
402
                    if (st->codec->codec_id == CODEC_ID_XAN_WC4)
403
                        xan_video = 1;
404
                    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
405
//                    url_fskip(pb, size - 5 * 4);
406
                    break;
407
                case CODEC_TYPE_AUDIO:
408
                    get_wav_header(pb, st->codec, size);
409
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
410
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
411
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
412
                        url_fskip(pb, 1);
413
                    /* special case time: To support Xan DPCM, hardcode
414
                     * the format if Xxan is the video codec */
415
                    st->need_parsing = 1;
416
                    /* force parsing as several audio frames can be in
417
                       one packet */
418
                    if (xan_video)
419
                        st->codec->codec_id = CODEC_ID_XAN_DPCM;
420
                    break;
421
                default:
422
                    st->codec->codec_type = CODEC_TYPE_DATA;
423
                    st->codec->codec_id= CODEC_ID_NONE;
424
                    st->codec->codec_tag= 0;
425
                    url_fskip(pb, size);
426
                    break;
427
                }
428
            }
429
            break;
430
        case MKTAG('i', 'n', 'd', 'x'):
431
            i= url_ftell(pb);
432
            if(!url_is_streamed(pb)){
433
                read_braindead_odml_indx(s, 0);
434
                avi->index_loaded=1;
435
            }
436
            url_fseek(pb, i+size, SEEK_SET);
437
            break;
438
        default:
439
            /* skip tag */
440
            size += (size & 1);
441
            url_fskip(pb, size);
442
            break;
443
        }
444
    }
445
 end_of_header:
446
    /* check stream number */
447
    if (stream_index != s->nb_streams - 1) {
448
    fail:
449
        for(i=0;i<s->nb_streams;i++) {
450
            av_freep(&s->streams[i]->codec->extradata);
451
            av_freep(&s->streams[i]);
452
        }
453
        return -1;
454
    }
455

    
456
    if(!avi->index_loaded && !url_is_streamed(pb))
457
        avi_load_index(s);
458
    avi->index_loaded = 1;
459
    avi->non_interleaved |= guess_ni_flag(s);
460
    if(avi->non_interleaved)
461
        clean_index(s);
462

    
463
    return 0;
464
}
465

    
466
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
467
{
468
    AVIContext *avi = s->priv_data;
469
    ByteIOContext *pb = &s->pb;
470
    int n, d[8], size;
471
    offset_t i, sync;
472
    void* dstr;
473

    
474
    if (avi->dv_demux) {
475
        size = dv_get_packet(avi->dv_demux, pkt);
476
        if (size >= 0)
477
            return size;
478
    }
479

    
480
    if(avi->non_interleaved){
481
        int best_stream_index = 0;
482
        AVStream *best_st= NULL;
483
        AVIStream *best_ast;
484
        int64_t best_ts= INT64_MAX;
485
        int i;
486

    
487
        for(i=0; i<s->nb_streams; i++){
488
            AVStream *st = s->streams[i];
489
            AVIStream *ast = st->priv_data;
490
            int64_t ts= ast->frame_offset;
491

    
492
            if(ast->sample_size)
493
                ts /= ast->sample_size;
494
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
495

    
496
//            av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
497
            if(ts < best_ts){
498
                best_ts= ts;
499
                best_st= st;
500
                best_stream_index= i;
501
            }
502
        }
503
        best_ast = best_st->priv_data;
504
        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
505
        if(best_ast->remaining)
506
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
507
        else
508
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
509

    
510
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
511
        if(i>=0){
512
            int64_t pos= best_st->index_entries[i].pos;
513
            pos += best_ast->packet_size - best_ast->remaining;
514
            url_fseek(&s->pb, pos + 8, SEEK_SET);
515
//        av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
516

    
517
            assert(best_ast->remaining <= best_ast->packet_size);
518

    
519
            avi->stream_index= best_stream_index;
520
            if(!best_ast->remaining)
521
                best_ast->packet_size=
522
                best_ast->remaining= best_st->index_entries[i].size;
523
        }
524
    }
525

    
526
resync:
527
    if(avi->stream_index >= 0){
528
        AVStream *st= s->streams[ avi->stream_index ];
529
        AVIStream *ast= st->priv_data;
530
        int size;
531

    
532
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
533
            size= INT_MAX;
534
        else if(ast->sample_size < 32)
535
            size= 64*ast->sample_size;
536
        else
537
            size= ast->sample_size;
538

    
539
        if(size > ast->remaining)
540
            size= ast->remaining;
541
        av_get_packet(pb, pkt, size);
542

    
543
        if (avi->dv_demux) {
544
            dstr = pkt->destruct;
545
            size = dv_produce_packet(avi->dv_demux, pkt,
546
                                    pkt->data, pkt->size);
547
            pkt->destruct = dstr;
548
            pkt->flags |= PKT_FLAG_KEY;
549
        } else {
550
            /* XXX: how to handle B frames in avi ? */
551
            pkt->dts = ast->frame_offset;
552
//                pkt->dts += ast->start;
553
            if(ast->sample_size)
554
                pkt->dts /= ast->sample_size;
555
//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);
556
            pkt->stream_index = avi->stream_index;
557

    
558
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
559
                if(st->index_entries){
560
                    AVIndexEntry *e;
561
                    int index;
562

    
563
                    index= av_index_search_timestamp(st, pkt->dts, 0);
564
                    e= &st->index_entries[index];
565

    
566
                    if(index >= 0 && e->timestamp == ast->frame_offset){
567
                        if (e->flags & AVINDEX_KEYFRAME)
568
                            pkt->flags |= PKT_FLAG_KEY;
569
                    }
570
                } else {
571
                    /* if no index, better to say that all frames
572
                        are key frames */
573
                    pkt->flags |= PKT_FLAG_KEY;
574
                }
575
            } else {
576
                pkt->flags |= PKT_FLAG_KEY;
577
            }
578
            if(ast->sample_size)
579
                ast->frame_offset += pkt->size;
580
            else
581
                ast->frame_offset++;
582
        }
583
        ast->remaining -= size;
584
        if(!ast->remaining){
585
            avi->stream_index= -1;
586
            ast->packet_size= 0;
587
            if (size & 1) {
588
                get_byte(pb);
589
                size++;
590
            }
591
        }
592

    
593
        return size;
594
    }
595

    
596
    memset(d, -1, sizeof(int)*8);
597
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
598
        int j;
599

    
600
        if (i >= avi->movi_end) {
601
            if (avi->is_odml) {
602
                url_fskip(pb, avi->riff_end - i);
603
                avi->riff_end = avi->movi_end = url_fsize(pb);
604
            } else
605
                break;
606
        }
607

    
608
        for(j=0; j<7; j++)
609
            d[j]= d[j+1];
610
        d[7]= get_byte(pb);
611

    
612
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
613

    
614
        if(    d[2] >= '0' && d[2] <= '9'
615
            && d[3] >= '0' && d[3] <= '9'){
616
            n= (d[2] - '0') * 10 + (d[3] - '0');
617
        }else{
618
            n= 100; //invalid stream id
619
        }
620
//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);
621
        if(i + size > avi->movi_end || d[0]<0)
622
            continue;
623

    
624
        //parse ix##
625
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
626
        //parse JUNK
627
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
628
            url_fskip(pb, size);
629
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
630
            goto resync;
631
        }
632

    
633
        if(    d[0] >= '0' && d[0] <= '9'
634
            && d[1] >= '0' && d[1] <= '9'){
635
            n= (d[0] - '0') * 10 + (d[1] - '0');
636
        }else{
637
            n= 100; //invalid stream id
638
        }
639

    
640
        //parse ##dc/##wb
641
        if(n < s->nb_streams){
642
          AVStream *st;
643
          AVIStream *ast;
644
          st = s->streams[n];
645
          ast = st->priv_data;
646

    
647
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
648
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
649
             || st->discard >= AVDISCARD_ALL){
650
                if(ast->sample_size) ast->frame_offset += pkt->size;
651
                else                 ast->frame_offset++;
652
                url_fskip(pb, size);
653
                goto resync;
654
          }
655

    
656
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
657
                d[2]*256+d[3] == ast->prefix /*||
658
                (d[2] == 'd' && d[3] == 'c') ||
659
                (d[2] == 'w' && d[3] == 'b')*/) {
660

    
661
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
662
            if(d[2]*256+d[3] == ast->prefix)
663
                ast->prefix_count++;
664
            else{
665
                ast->prefix= d[2]*256+d[3];
666
                ast->prefix_count= 0;
667
            }
668

    
669
            avi->stream_index= n;
670
            ast->packet_size= size + 8;
671
            ast->remaining= size;
672
            goto resync;
673
          }
674
        }
675
        /* palette changed chunk */
676
        if (   d[0] >= '0' && d[0] <= '9'
677
            && d[1] >= '0' && d[1] <= '9'
678
            && ((d[2] == 'p' && d[3] == 'c'))
679
            && n < s->nb_streams && i + size <= avi->movi_end) {
680

    
681
            AVStream *st;
682
            int first, clr, flags, k, p;
683

    
684
            st = s->streams[n];
685

    
686
            first = get_byte(pb);
687
            clr = get_byte(pb);
688
            if(!clr) /* all 256 colors used */
689
                clr = 256;
690
            flags = get_le16(pb);
691
            p = 4;
692
            for (k = first; k < clr + first; k++) {
693
                int r, g, b;
694
                r = get_byte(pb);
695
                g = get_byte(pb);
696
                b = get_byte(pb);
697
                    get_byte(pb);
698
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
699
            }
700
            st->codec->palctrl->palette_changed = 1;
701
            goto resync;
702
        }
703

    
704
    }
705

    
706
    return -1;
707
}
708

    
709
/* XXX: we make the implicit supposition that the position are sorted
710
   for each stream */
711
static int avi_read_idx1(AVFormatContext *s, int size)
712
{
713
    AVIContext *avi = s->priv_data;
714
    ByteIOContext *pb = &s->pb;
715
    int nb_index_entries, i;
716
    AVStream *st;
717
    AVIStream *ast;
718
    unsigned int index, tag, flags, pos, len;
719
    unsigned last_pos= -1;
720

    
721
    nb_index_entries = size / 16;
722
    if (nb_index_entries <= 0)
723
        return -1;
724

    
725
    /* read the entries and sort them in each stream component */
726
    for(i = 0; i < nb_index_entries; i++) {
727
        tag = get_le32(pb);
728
        flags = get_le32(pb);
729
        pos = get_le32(pb);
730
        len = get_le32(pb);
731
#if defined(DEBUG_SEEK)
732
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
733
               i, tag, flags, pos, len);
734
#endif
735
        if(i==0 && pos > avi->movi_list)
736
            avi->movi_list= 0; //FIXME better check
737
        pos += avi->movi_list;
738

    
739
        index = ((tag & 0xff) - '0') * 10;
740
        index += ((tag >> 8) & 0xff) - '0';
741
        if (index >= s->nb_streams)
742
            continue;
743
        st = s->streams[index];
744
        ast = st->priv_data;
745

    
746
#if defined(DEBUG_SEEK)
747
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
748
#endif
749
        if(last_pos == pos)
750
            avi->non_interleaved= 1;
751
        else
752
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
753
        if(ast->sample_size)
754
            ast->cum_len += len / ast->sample_size;
755
        else
756
            ast->cum_len ++;
757
        last_pos= pos;
758
    }
759
    return 0;
760
}
761

    
762
static int guess_ni_flag(AVFormatContext *s){
763
    int i;
764
    int64_t last_start=0;
765
    int64_t first_end= INT64_MAX;
766

    
767
    for(i=0; i<s->nb_streams; i++){
768
        AVStream *st = s->streams[i];
769
        int n= st->nb_index_entries;
770

    
771
        if(n <= 0)
772
            continue;
773

    
774
        if(st->index_entries[0].pos > last_start)
775
            last_start= st->index_entries[0].pos;
776
        if(st->index_entries[n-1].pos < first_end)
777
            first_end= st->index_entries[n-1].pos;
778
    }
779
    return last_start > first_end;
780
}
781

    
782
static int avi_load_index(AVFormatContext *s)
783
{
784
    AVIContext *avi = s->priv_data;
785
    ByteIOContext *pb = &s->pb;
786
    uint32_t tag, size;
787
    offset_t pos= url_ftell(pb);
788

    
789
    url_fseek(pb, avi->movi_end, SEEK_SET);
790
#ifdef DEBUG_SEEK
791
    printf("movi_end=0x%llx\n", avi->movi_end);
792
#endif
793
    for(;;) {
794
        if (url_feof(pb))
795
            break;
796
        tag = get_le32(pb);
797
        size = get_le32(pb);
798
#ifdef DEBUG_SEEK
799
        printf("tag=%c%c%c%c size=0x%x\n",
800
               tag & 0xff,
801
               (tag >> 8) & 0xff,
802
               (tag >> 16) & 0xff,
803
               (tag >> 24) & 0xff,
804
               size);
805
#endif
806
        switch(tag) {
807
        case MKTAG('i', 'd', 'x', '1'):
808
            if (avi_read_idx1(s, size) < 0)
809
                goto skip;
810
            else
811
                goto the_end;
812
            break;
813
        default:
814
        skip:
815
            size += (size & 1);
816
            url_fskip(pb, size);
817
            break;
818
        }
819
    }
820
 the_end:
821
    url_fseek(pb, pos, SEEK_SET);
822
    return 0;
823
}
824

    
825
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
826
{
827
    AVIContext *avi = s->priv_data;
828
    AVStream *st;
829
    int i, index;
830
    int64_t pos;
831

    
832
    if (!avi->index_loaded) {
833
        /* we only load the index on demand */
834
        avi_load_index(s);
835
        avi->index_loaded = 1;
836
    }
837
    assert(stream_index>= 0);
838

    
839
    st = s->streams[stream_index];
840
    index= av_index_search_timestamp(st, timestamp, flags);
841
    if(index<0)
842
        return -1;
843

    
844
    /* find the position */
845
    pos = st->index_entries[index].pos;
846
    timestamp = st->index_entries[index].timestamp;
847

    
848
//    av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
849

    
850
    for(i = 0; i < s->nb_streams; i++) {
851
        AVStream *st2 = s->streams[i];
852
        AVIStream *ast2 = st2->priv_data;
853

    
854
        ast2->packet_size=
855
        ast2->remaining= 0;
856

    
857
        if (st2->nb_index_entries <= 0)
858
            continue;
859

    
860
//        assert(st2->codec->block_align);
861
        assert(st2->time_base.den == ast2->rate);
862
        assert(st2->time_base.num == ast2->scale);
863
        index = av_index_search_timestamp(
864
                st2,
865
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
866
                flags | AVSEEK_FLAG_BACKWARD);
867
        if(index<0)
868
            index=0;
869

    
870
        if(!avi->non_interleaved){
871
            while(index>0 && st2->index_entries[index].pos > pos)
872
                index--;
873
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
874
                index++;
875
        }
876

    
877
//        av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
878
        /* extract the current frame number */
879
        ast2->frame_offset = st2->index_entries[index].timestamp;
880
        if(ast2->sample_size)
881
            ast2->frame_offset *=ast2->sample_size;
882
    }
883

    
884
    if (avi->dv_demux)
885
        dv_flush_audio_packets(avi->dv_demux);
886
    /* do the seek */
887
    url_fseek(&s->pb, pos, SEEK_SET);
888
    avi->stream_index= -1;
889
    return 0;
890
}
891

    
892
static int avi_read_close(AVFormatContext *s)
893
{
894
    int i;
895
    AVIContext *avi = s->priv_data;
896

    
897
    for(i=0;i<s->nb_streams;i++) {
898
        AVStream *st = s->streams[i];
899
        AVIStream *ast = st->priv_data;
900
        av_free(ast);
901
        av_free(st->codec->palctrl);
902
    }
903

    
904
    if (avi->dv_demux)
905
        av_free(avi->dv_demux);
906

    
907
    return 0;
908
}
909

    
910
static int avi_probe(AVProbeData *p)
911
{
912
    /* check file header */
913
    if (p->buf_size <= 32)
914
        return 0;
915
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
916
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
917
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
918
        p->buf[10] == 'I' && p->buf[11] == ' ')
919
        return AVPROBE_SCORE_MAX;
920
    else
921
        return 0;
922
}
923

    
924
static AVInputFormat avi_iformat = {
925
    "avi",
926
    "avi format",
927
    sizeof(AVIContext),
928
    avi_probe,
929
    avi_read_header,
930
    avi_read_packet,
931
    avi_read_close,
932
    avi_read_seek,
933
};
934

    
935
int avidec_init(void)
936
{
937
    av_register_input_format(&avi_iformat);
938
    return 0;
939
}