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ffmpeg / libavformat / avidec.c @ 965a63af

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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
#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
    int64_t filesize= url_fsize(&s->pb);
104

    
105
#ifdef DEBUG_SEEK
106
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16LX\n",
107
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
108
#endif
109

    
110
    if(stream_id > s->nb_streams || stream_id < 0)
111
        return -1;
112
    st= s->streams[stream_id];
113
    ast = st->priv_data;
114

    
115
    if(index_sub_type)
116
        return -1;
117

    
118
    get_le32(pb);
119

    
120
    if(index_type && longs_pre_entry != 2)
121
        return -1;
122
    if(index_type>1)
123
        return -1;
124

    
125
    if(filesize > 0 && base >= filesize){
126
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
127
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
128
            base &= 0xFFFFFFFF;
129
        else
130
            return -1;
131
    }
132

    
133
    for(i=0; i<entries_in_use; i++){
134
        if(index_type){
135
            int64_t pos= get_le32(pb) + base - 8;
136
            int len    = get_le32(pb);
137
            int key= len >= 0;
138
            len &= 0x7FFFFFFF;
139

    
140
#ifdef DEBUG_SEEK
141
            av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
142
#endif
143
            if(last_pos == pos || pos == base - 8)
144
                avi->non_interleaved= 1;
145
            else
146
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
147

    
148
            if(ast->sample_size)
149
                ast->cum_len += len / ast->sample_size;
150
            else
151
                ast->cum_len ++;
152
            last_pos= pos;
153
        }else{
154
            int64_t offset, pos;
155
            int duration;
156
            offset = get_le64(pb);
157
            get_le32(pb);       /* size */
158
            duration = get_le32(pb);
159
            pos = url_ftell(pb);
160

    
161
            url_fseek(pb, offset+8, SEEK_SET);
162
            read_braindead_odml_indx(s, frame_num);
163
            frame_num += duration;
164

    
165
            url_fseek(pb, pos, SEEK_SET);
166
        }
167
    }
168
    avi->index_loaded=1;
169
    return 0;
170
}
171

    
172
static void clean_index(AVFormatContext *s){
173
    int i;
174
    int64_t j;
175

    
176
    for(i=0; i<s->nb_streams; i++){
177
        AVStream *st = s->streams[i];
178
        AVIStream *ast = st->priv_data;
179
        int n= st->nb_index_entries;
180
        int max= ast->sample_size;
181
        int64_t pos, size, ts;
182

    
183
        if(n != 1 || ast->sample_size==0)
184
            continue;
185

    
186
        while(max < 1024) max+=max;
187

    
188
        pos= st->index_entries[0].pos;
189
        size= st->index_entries[0].size;
190
        ts= st->index_entries[0].timestamp;
191

    
192
        for(j=0; j<size; j+=max){
193
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
194
        }
195
    }
196
}
197

    
198
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
199
{
200
    offset_t i = url_ftell(pb);
201
    size += (size & 1);
202
    get_strz(pb, buf, maxlen);
203
    url_fseek(pb, i+size, SEEK_SET);
204
    return 0;
205
}
206

    
207
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
208
{
209
    AVIContext *avi = s->priv_data;
210
    ByteIOContext *pb = &s->pb;
211
    uint32_t tag, tag1, handler;
212
    int codec_type, stream_index, frame_period, bit_rate;
213
    unsigned int size, nb_frames;
214
    int i, n;
215
    AVStream *st;
216
    AVIStream *ast = NULL;
217
    int xan_video = 0;  /* hack to support Xan A/V */
218

    
219
    avi->stream_index= -1;
220

    
221
    if (get_riff(avi, pb) < 0)
222
        return -1;
223

    
224
    /* first list tag */
225
    stream_index = -1;
226
    codec_type = -1;
227
    frame_period = 0;
228
    for(;;) {
229
        if (url_feof(pb))
230
            goto fail;
231
        tag = get_le32(pb);
232
        size = get_le32(pb);
233
#ifdef DEBUG
234
        print_tag("tag", tag, size);
235
#endif
236

    
237
        switch(tag) {
238
        case MKTAG('L', 'I', 'S', 'T'):
239
            /* ignored, except when start of video packets */
240
            tag1 = get_le32(pb);
241
#ifdef DEBUG
242
            print_tag("list", tag1, 0);
243
#endif
244
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
245
                avi->movi_list = url_ftell(pb) - 4;
246
                if(size) avi->movi_end = avi->movi_list + size;
247
                else     avi->movi_end = url_fsize(pb);
248
#ifdef DEBUG
249
                printf("movi end=%Lx\n", avi->movi_end);
250
#endif
251
                goto end_of_header;
252
            }
253
            break;
254
        case MKTAG('d', 'm', 'l', 'h'):
255
            avi->is_odml = 1;
256
            url_fskip(pb, size + (size & 1));
257
            break;
258
        case MKTAG('a', 'v', 'i', 'h'):
259
            /* avi header */
260
            /* using frame_period is bad idea */
261
            frame_period = get_le32(pb);
262
            bit_rate = get_le32(pb) * 8;
263
            get_le32(pb);
264
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
265

    
266
            url_fskip(pb, 2 * 4);
267
            n = get_le32(pb);
268
            for(i=0;i<n;i++) {
269
                AVIStream *ast;
270
                st = av_new_stream(s, i);
271
                if (!st)
272
                    goto fail;
273

    
274
                ast = av_mallocz(sizeof(AVIStream));
275
                if (!ast)
276
                    goto fail;
277
                st->priv_data = ast;
278
            }
279
            url_fskip(pb, size - 7 * 4);
280
            break;
281
        case MKTAG('s', 't', 'r', 'h'):
282
            /* stream header */
283
            stream_index++;
284
            tag1 = get_le32(pb);
285
            handler = get_le32(pb); /* codec tag */
286
#ifdef DEBUG
287
        print_tag("strh", tag1, -1);
288
#endif
289
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
290
                /*
291
                 * After some consideration -- I don't think we
292
                 * have to support anything but DV in a type1 AVIs.
293
                 */
294
                if (s->nb_streams != 1)
295
                    goto fail;
296

    
297
                if (handler != MKTAG('d', 'v', 's', 'd') &&
298
                    handler != MKTAG('d', 'v', 'h', 'd') &&
299
                    handler != MKTAG('d', 'v', 's', 'l'))
300
                   goto fail;
301

    
302
                ast = s->streams[0]->priv_data;
303
                av_freep(&s->streams[0]->codec->extradata);
304
                av_freep(&s->streams[0]);
305
                s->nb_streams = 0;
306
                avi->dv_demux = dv_init_demux(s);
307
                if (!avi->dv_demux)
308
                    goto fail;
309
                s->streams[0]->priv_data = ast;
310
                url_fskip(pb, 3 * 4);
311
                ast->scale = get_le32(pb);
312
                ast->rate = get_le32(pb);
313
                stream_index = s->nb_streams - 1;
314
                url_fskip(pb, size - 7*4);
315
                break;
316
            }
317

    
318
            if (stream_index >= s->nb_streams) {
319
                url_fskip(pb, size - 8);
320
                /* ignore padding stream */
321
                if (tag1 == MKTAG('p', 'a', 'd', 's'))
322
                    stream_index--;
323
                break;
324
            }
325
            st = s->streams[stream_index];
326
            ast = st->priv_data;
327
            st->codec->stream_codec_tag= handler;
328

    
329
            get_le32(pb); /* flags */
330
            get_le16(pb); /* priority */
331
            get_le16(pb); /* language */
332
            get_le32(pb); /* initial frame */
333
            ast->scale = get_le32(pb);
334
            ast->rate = get_le32(pb);
335
            if(ast->scale && ast->rate){
336
            }else if(frame_period){
337
                ast->rate = 1000000;
338
                ast->scale = frame_period;
339
            }else{
340
                ast->rate = 25;
341
                ast->scale = 1;
342
            }
343
            av_set_pts_info(st, 64, ast->scale, ast->rate);
344

    
345
            ast->cum_len=get_le32(pb); /* start */
346
            nb_frames = get_le32(pb);
347

    
348
            st->start_time = 0;
349
            st->duration = nb_frames;
350
            get_le32(pb); /* buffer size */
351
            get_le32(pb); /* quality */
352
            ast->sample_size = get_le32(pb); /* sample ssize */
353
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
354

    
355
            switch(tag1) {
356
            case MKTAG('v', 'i', 'd', 's'):
357
                codec_type = CODEC_TYPE_VIDEO;
358

    
359
                ast->sample_size = 0;
360
                break;
361
            case MKTAG('a', 'u', 'd', 's'):
362
                codec_type = CODEC_TYPE_AUDIO;
363
                break;
364
            case MKTAG('t', 'x', 't', 's'):
365
                //FIXME
366
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
367
                break;
368
            case MKTAG('p', 'a', 'd', 's'):
369
                codec_type = CODEC_TYPE_UNKNOWN;
370
                stream_index--;
371
                break;
372
            default:
373
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
374
                goto fail;
375
            }
376
            ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
377
            url_fskip(pb, size - 12 * 4);
378
            break;
379
        case MKTAG('s', 't', 'r', 'f'):
380
            /* stream header */
381
            if (stream_index >= s->nb_streams || avi->dv_demux) {
382
                url_fskip(pb, size);
383
            } else {
384
                st = s->streams[stream_index];
385
                switch(codec_type) {
386
                case CODEC_TYPE_VIDEO:
387
                    get_le32(pb); /* size */
388
                    st->codec->width = get_le32(pb);
389
                    st->codec->height = get_le32(pb);
390
                    get_le16(pb); /* panes */
391
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
392
                    tag1 = get_le32(pb);
393
                    get_le32(pb); /* ImageSize */
394
                    get_le32(pb); /* XPelsPerMeter */
395
                    get_le32(pb); /* YPelsPerMeter */
396
                    get_le32(pb); /* ClrUsed */
397
                    get_le32(pb); /* ClrImportant */
398

    
399
                 if(size > 10*4 && size<(1<<30)){
400
                    st->codec->extradata_size= size - 10*4;
401
                    st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
402
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
403
                 }
404

    
405
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
406
                        get_byte(pb);
407

    
408
                    /* Extract palette from extradata if bpp <= 8 */
409
                    /* This code assumes that extradata contains only palette */
410
                    /* This is true for all paletted codecs implemented in ffmpeg */
411
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
412
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
413
#ifdef WORDS_BIGENDIAN
414
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
415
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
416
#else
417
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
418
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
419
#endif
420
                        st->codec->palctrl->palette_changed = 1;
421
                    }
422

    
423
#ifdef DEBUG
424
                    print_tag("video", tag1, 0);
425
#endif
426
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
427
                    st->codec->codec_tag = tag1;
428
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
429
                    if (st->codec->codec_id == CODEC_ID_XAN_WC4)
430
                        xan_video = 1;
431
                    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
432
//                    url_fskip(pb, size - 5 * 4);
433
                    break;
434
                case CODEC_TYPE_AUDIO:
435
                    get_wav_header(pb, st->codec, size);
436
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
437
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
438
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
439
                        url_fskip(pb, 1);
440
                    /* special case time: To support Xan DPCM, hardcode
441
                     * the format if Xxan is the video codec */
442
                    st->need_parsing = 1;
443
                    /* force parsing as several audio frames can be in
444
                       one packet */
445
                    if (xan_video)
446
                        st->codec->codec_id = CODEC_ID_XAN_DPCM;
447
                    break;
448
                default:
449
                    st->codec->codec_type = CODEC_TYPE_DATA;
450
                    st->codec->codec_id= CODEC_ID_NONE;
451
                    st->codec->codec_tag= 0;
452
                    url_fskip(pb, size);
453
                    break;
454
                }
455
            }
456
            break;
457
        case MKTAG('i', 'n', 'd', 'x'):
458
            i= url_ftell(pb);
459
            if(!url_is_streamed(pb)){
460
                read_braindead_odml_indx(s, 0);
461
            }
462
            url_fseek(pb, i+size, SEEK_SET);
463
            break;
464
        case MKTAG('I', 'N', 'A', 'M'):
465
            avi_read_tag(pb, s->title, sizeof(s->title), size);
466
            break;
467
        case MKTAG('I', 'A', 'R', 'T'):
468
            avi_read_tag(pb, s->author, sizeof(s->author), size);
469
            break;
470
        case MKTAG('I', 'C', 'O', 'P'):
471
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
472
            break;
473
        case MKTAG('I', 'C', 'M', 'T'):
474
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
475
            break;
476
        case MKTAG('I', 'G', 'N', 'R'):
477
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
478
            break;
479
        default:
480
            /* skip tag */
481
            size += (size & 1);
482
            url_fskip(pb, size);
483
            break;
484
        }
485
    }
486
 end_of_header:
487
    /* check stream number */
488
    if (stream_index != s->nb_streams - 1) {
489
    fail:
490
        for(i=0;i<s->nb_streams;i++) {
491
            av_freep(&s->streams[i]->codec->extradata);
492
            av_freep(&s->streams[i]);
493
        }
494
        return -1;
495
    }
496

    
497
    if(!avi->index_loaded && !url_is_streamed(pb))
498
        avi_load_index(s);
499
    avi->index_loaded = 1;
500
    avi->non_interleaved |= guess_ni_flag(s);
501
    if(avi->non_interleaved)
502
        clean_index(s);
503

    
504
    return 0;
505
}
506

    
507
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
508
{
509
    AVIContext *avi = s->priv_data;
510
    ByteIOContext *pb = &s->pb;
511
    int n, d[8], size;
512
    offset_t i, sync;
513
    void* dstr;
514

    
515
    if (avi->dv_demux) {
516
        size = dv_get_packet(avi->dv_demux, pkt);
517
        if (size >= 0)
518
            return size;
519
    }
520

    
521
    if(avi->non_interleaved){
522
        int best_stream_index = 0;
523
        AVStream *best_st= NULL;
524
        AVIStream *best_ast;
525
        int64_t best_ts= INT64_MAX;
526
        int i;
527

    
528
        for(i=0; i<s->nb_streams; i++){
529
            AVStream *st = s->streams[i];
530
            AVIStream *ast = st->priv_data;
531
            int64_t ts= ast->frame_offset;
532

    
533
            if(ast->sample_size)
534
                ts /= ast->sample_size;
535
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
536

    
537
//            av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
538
            if(ts < best_ts){
539
                best_ts= ts;
540
                best_st= st;
541
                best_stream_index= i;
542
            }
543
        }
544
        best_ast = best_st->priv_data;
545
        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
546
        if(best_ast->remaining)
547
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
548
        else
549
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
550

    
551
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
552
        if(i>=0){
553
            int64_t pos= best_st->index_entries[i].pos;
554
            pos += best_ast->packet_size - best_ast->remaining;
555
            url_fseek(&s->pb, pos + 8, SEEK_SET);
556
//        av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
557

    
558
            assert(best_ast->remaining <= best_ast->packet_size);
559

    
560
            avi->stream_index= best_stream_index;
561
            if(!best_ast->remaining)
562
                best_ast->packet_size=
563
                best_ast->remaining= best_st->index_entries[i].size;
564
        }
565
    }
566

    
567
resync:
568
    if(avi->stream_index >= 0){
569
        AVStream *st= s->streams[ avi->stream_index ];
570
        AVIStream *ast= st->priv_data;
571
        int size;
572

    
573
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
574
            size= INT_MAX;
575
        else if(ast->sample_size < 32)
576
            size= 64*ast->sample_size;
577
        else
578
            size= ast->sample_size;
579

    
580
        if(size > ast->remaining)
581
            size= ast->remaining;
582
        av_get_packet(pb, pkt, size);
583

    
584
        if (avi->dv_demux) {
585
            dstr = pkt->destruct;
586
            size = dv_produce_packet(avi->dv_demux, pkt,
587
                                    pkt->data, pkt->size);
588
            pkt->destruct = dstr;
589
            pkt->flags |= PKT_FLAG_KEY;
590
        } else {
591
            /* XXX: how to handle B frames in avi ? */
592
            pkt->dts = ast->frame_offset;
593
//                pkt->dts += ast->start;
594
            if(ast->sample_size)
595
                pkt->dts /= ast->sample_size;
596
//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);
597
            pkt->stream_index = avi->stream_index;
598

    
599
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
600
                if(st->index_entries){
601
                    AVIndexEntry *e;
602
                    int index;
603

    
604
                    index= av_index_search_timestamp(st, pkt->dts, 0);
605
                    e= &st->index_entries[index];
606

    
607
                    if(index >= 0 && e->timestamp == ast->frame_offset){
608
                        if (e->flags & AVINDEX_KEYFRAME)
609
                            pkt->flags |= PKT_FLAG_KEY;
610
                    }
611
                } else {
612
                    /* if no index, better to say that all frames
613
                        are key frames */
614
                    pkt->flags |= PKT_FLAG_KEY;
615
                }
616
            } else {
617
                pkt->flags |= PKT_FLAG_KEY;
618
            }
619
            if(ast->sample_size)
620
                ast->frame_offset += pkt->size;
621
            else
622
                ast->frame_offset++;
623
        }
624
        ast->remaining -= size;
625
        if(!ast->remaining){
626
            avi->stream_index= -1;
627
            ast->packet_size= 0;
628
            if (size & 1) {
629
                get_byte(pb);
630
                size++;
631
            }
632
        }
633

    
634
        return size;
635
    }
636

    
637
    memset(d, -1, sizeof(int)*8);
638
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
639
        int j;
640

    
641
        if (i >= avi->movi_end) {
642
            if (avi->is_odml) {
643
                url_fskip(pb, avi->riff_end - i);
644
                avi->riff_end = avi->movi_end = url_fsize(pb);
645
            } else
646
                break;
647
        }
648

    
649
        for(j=0; j<7; j++)
650
            d[j]= d[j+1];
651
        d[7]= get_byte(pb);
652

    
653
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
654

    
655
        if(    d[2] >= '0' && d[2] <= '9'
656
            && d[3] >= '0' && d[3] <= '9'){
657
            n= (d[2] - '0') * 10 + (d[3] - '0');
658
        }else{
659
            n= 100; //invalid stream id
660
        }
661
//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);
662
        if(i + size > avi->movi_end || d[0]<0)
663
            continue;
664

    
665
        //parse ix##
666
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
667
        //parse JUNK
668
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
669
            url_fskip(pb, size);
670
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
671
            goto resync;
672
        }
673

    
674
        if(    d[0] >= '0' && d[0] <= '9'
675
            && d[1] >= '0' && d[1] <= '9'){
676
            n= (d[0] - '0') * 10 + (d[1] - '0');
677
        }else{
678
            n= 100; //invalid stream id
679
        }
680

    
681
        //parse ##dc/##wb
682
        if(n < s->nb_streams){
683
          AVStream *st;
684
          AVIStream *ast;
685
          st = s->streams[n];
686
          ast = st->priv_data;
687

    
688
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
689
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
690
             || st->discard >= AVDISCARD_ALL){
691
                if(ast->sample_size) ast->frame_offset += pkt->size;
692
                else                 ast->frame_offset++;
693
                url_fskip(pb, size);
694
                goto resync;
695
          }
696

    
697
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
698
                d[2]*256+d[3] == ast->prefix /*||
699
                (d[2] == 'd' && d[3] == 'c') ||
700
                (d[2] == 'w' && d[3] == 'b')*/) {
701

    
702
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
703
            if(d[2]*256+d[3] == ast->prefix)
704
                ast->prefix_count++;
705
            else{
706
                ast->prefix= d[2]*256+d[3];
707
                ast->prefix_count= 0;
708
            }
709

    
710
            avi->stream_index= n;
711
            ast->packet_size= size + 8;
712
            ast->remaining= size;
713
            goto resync;
714
          }
715
        }
716
        /* palette changed chunk */
717
        if (   d[0] >= '0' && d[0] <= '9'
718
            && d[1] >= '0' && d[1] <= '9'
719
            && ((d[2] == 'p' && d[3] == 'c'))
720
            && n < s->nb_streams && i + size <= avi->movi_end) {
721

    
722
            AVStream *st;
723
            int first, clr, flags, k, p;
724

    
725
            st = s->streams[n];
726

    
727
            first = get_byte(pb);
728
            clr = get_byte(pb);
729
            if(!clr) /* all 256 colors used */
730
                clr = 256;
731
            flags = get_le16(pb);
732
            p = 4;
733
            for (k = first; k < clr + first; k++) {
734
                int r, g, b;
735
                r = get_byte(pb);
736
                g = get_byte(pb);
737
                b = get_byte(pb);
738
                    get_byte(pb);
739
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
740
            }
741
            st->codec->palctrl->palette_changed = 1;
742
            goto resync;
743
        }
744

    
745
    }
746

    
747
    return -1;
748
}
749

    
750
/* XXX: we make the implicit supposition that the position are sorted
751
   for each stream */
752
static int avi_read_idx1(AVFormatContext *s, int size)
753
{
754
    AVIContext *avi = s->priv_data;
755
    ByteIOContext *pb = &s->pb;
756
    int nb_index_entries, i;
757
    AVStream *st;
758
    AVIStream *ast;
759
    unsigned int index, tag, flags, pos, len;
760
    unsigned last_pos= -1;
761

    
762
    nb_index_entries = size / 16;
763
    if (nb_index_entries <= 0)
764
        return -1;
765

    
766
    /* read the entries and sort them in each stream component */
767
    for(i = 0; i < nb_index_entries; i++) {
768
        tag = get_le32(pb);
769
        flags = get_le32(pb);
770
        pos = get_le32(pb);
771
        len = get_le32(pb);
772
#if defined(DEBUG_SEEK)
773
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
774
               i, tag, flags, pos, len);
775
#endif
776
        if(i==0 && pos > avi->movi_list)
777
            avi->movi_list= 0; //FIXME better check
778
        pos += avi->movi_list;
779

    
780
        index = ((tag & 0xff) - '0') * 10;
781
        index += ((tag >> 8) & 0xff) - '0';
782
        if (index >= s->nb_streams)
783
            continue;
784
        st = s->streams[index];
785
        ast = st->priv_data;
786

    
787
#if defined(DEBUG_SEEK)
788
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%Ld\n", len, ast->cum_len);
789
#endif
790
        if(last_pos == pos)
791
            avi->non_interleaved= 1;
792
        else
793
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
794
        if(ast->sample_size)
795
            ast->cum_len += len / ast->sample_size;
796
        else
797
            ast->cum_len ++;
798
        last_pos= pos;
799
    }
800
    return 0;
801
}
802

    
803
static int guess_ni_flag(AVFormatContext *s){
804
    int i;
805
    int64_t last_start=0;
806
    int64_t first_end= INT64_MAX;
807

    
808
    for(i=0; i<s->nb_streams; i++){
809
        AVStream *st = s->streams[i];
810
        int n= st->nb_index_entries;
811

    
812
        if(n <= 0)
813
            continue;
814

    
815
        if(st->index_entries[0].pos > last_start)
816
            last_start= st->index_entries[0].pos;
817
        if(st->index_entries[n-1].pos < first_end)
818
            first_end= st->index_entries[n-1].pos;
819
    }
820
    return last_start > first_end;
821
}
822

    
823
static int avi_load_index(AVFormatContext *s)
824
{
825
    AVIContext *avi = s->priv_data;
826
    ByteIOContext *pb = &s->pb;
827
    uint32_t tag, size;
828
    offset_t pos= url_ftell(pb);
829

    
830
    url_fseek(pb, avi->movi_end, SEEK_SET);
831
#ifdef DEBUG_SEEK
832
    printf("movi_end=0x%llx\n", avi->movi_end);
833
#endif
834
    for(;;) {
835
        if (url_feof(pb))
836
            break;
837
        tag = get_le32(pb);
838
        size = get_le32(pb);
839
#ifdef DEBUG_SEEK
840
        printf("tag=%c%c%c%c size=0x%x\n",
841
               tag & 0xff,
842
               (tag >> 8) & 0xff,
843
               (tag >> 16) & 0xff,
844
               (tag >> 24) & 0xff,
845
               size);
846
#endif
847
        switch(tag) {
848
        case MKTAG('i', 'd', 'x', '1'):
849
            if (avi_read_idx1(s, size) < 0)
850
                goto skip;
851
            else
852
                goto the_end;
853
            break;
854
        default:
855
        skip:
856
            size += (size & 1);
857
            url_fskip(pb, size);
858
            break;
859
        }
860
    }
861
 the_end:
862
    url_fseek(pb, pos, SEEK_SET);
863
    return 0;
864
}
865

    
866
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
867
{
868
    AVIContext *avi = s->priv_data;
869
    AVStream *st;
870
    int i, index;
871
    int64_t pos;
872

    
873
    if (!avi->index_loaded) {
874
        /* we only load the index on demand */
875
        avi_load_index(s);
876
        avi->index_loaded = 1;
877
    }
878
    assert(stream_index>= 0);
879

    
880
    st = s->streams[stream_index];
881
    index= av_index_search_timestamp(st, timestamp, flags);
882
    if(index<0)
883
        return -1;
884

    
885
    /* find the position */
886
    pos = st->index_entries[index].pos;
887
    timestamp = st->index_entries[index].timestamp;
888

    
889
//    av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
890

    
891
    for(i = 0; i < s->nb_streams; i++) {
892
        AVStream *st2 = s->streams[i];
893
        AVIStream *ast2 = st2->priv_data;
894

    
895
        ast2->packet_size=
896
        ast2->remaining= 0;
897

    
898
        if (st2->nb_index_entries <= 0)
899
            continue;
900

    
901
//        assert(st2->codec->block_align);
902
        assert(st2->time_base.den == ast2->rate);
903
        assert(st2->time_base.num == ast2->scale);
904
        index = av_index_search_timestamp(
905
                st2,
906
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
907
                flags | AVSEEK_FLAG_BACKWARD);
908
        if(index<0)
909
            index=0;
910

    
911
        if(!avi->non_interleaved){
912
            while(index>0 && st2->index_entries[index].pos > pos)
913
                index--;
914
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
915
                index++;
916
        }
917

    
918
//        av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
919
        /* extract the current frame number */
920
        ast2->frame_offset = st2->index_entries[index].timestamp;
921
        if(ast2->sample_size)
922
            ast2->frame_offset *=ast2->sample_size;
923
    }
924

    
925
    if (avi->dv_demux)
926
        dv_flush_audio_packets(avi->dv_demux);
927
    /* do the seek */
928
    url_fseek(&s->pb, pos, SEEK_SET);
929
    avi->stream_index= -1;
930
    return 0;
931
}
932

    
933
static int avi_read_close(AVFormatContext *s)
934
{
935
    int i;
936
    AVIContext *avi = s->priv_data;
937

    
938
    for(i=0;i<s->nb_streams;i++) {
939
        AVStream *st = s->streams[i];
940
        AVIStream *ast = st->priv_data;
941
        av_free(ast);
942
        av_free(st->codec->palctrl);
943
    }
944

    
945
    if (avi->dv_demux)
946
        av_free(avi->dv_demux);
947

    
948
    return 0;
949
}
950

    
951
static int avi_probe(AVProbeData *p)
952
{
953
    /* check file header */
954
    if (p->buf_size <= 32)
955
        return 0;
956
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
957
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
958
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
959
        p->buf[10] == 'I' && p->buf[11] == ' ')
960
        return AVPROBE_SCORE_MAX;
961
    else
962
        return 0;
963
}
964

    
965
AVInputFormat avi_demuxer = {
966
    "avi",
967
    "avi format",
968
    sizeof(AVIContext),
969
    avi_probe,
970
    avi_read_header,
971
    avi_read_packet,
972
    avi_read_close,
973
    avi_read_seek,
974
};