Statistics
| Branch: | Revision:

ffmpeg / libavformat / avidec.c @ 90ed2776

History | View | Annotate | Download (46.1 KB)

1
/*
2
 * AVI demuxer
3
 * Copyright (c) 2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
//#define DEBUG
23
//#define DEBUG_SEEK
24

    
25
#include <strings.h>
26
#include "libavutil/intreadwrite.h"
27
#include "libavutil/bswap.h"
28
#include "avformat.h"
29
#include "avi.h"
30
#include "dv.h"
31
#include "riff.h"
32

    
33
#undef NDEBUG
34
#include <assert.h>
35

    
36
typedef struct AVIStream {
37
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
38
                         (used to compute the pts) */
39
    int remaining;
40
    int packet_size;
41

    
42
    int scale;
43
    int rate;
44
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45

    
46
    int64_t cum_len; /* temporary storage (used during seek) */
47

    
48
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
49
    int prefix_count;
50
    uint32_t pal[256];
51
    int has_pal;
52
    int dshow_block_align;            ///< block align variable used to emulate bugs in the MS dshow demuxer
53

    
54
    AVFormatContext *sub_ctx;
55
    AVPacket sub_pkt;
56
    uint8_t *sub_buffer;
57
} AVIStream;
58

    
59
typedef struct {
60
    int64_t  riff_end;
61
    int64_t  movi_end;
62
    int64_t  fsize;
63
    int64_t movi_list;
64
    int64_t last_pkt_pos;
65
    int index_loaded;
66
    int is_odml;
67
    int non_interleaved;
68
    int stream_index;
69
    DVDemuxContext* dv_demux;
70
    int odml_depth;
71
#define MAX_ODML_DEPTH 1000
72
} AVIContext;
73

    
74
static const char avi_headers[][8] = {
75
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
76
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
77
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
78
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
79
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
80
    { 0 }
81
};
82

    
83
static int avi_load_index(AVFormatContext *s);
84
static int guess_ni_flag(AVFormatContext *s);
85

    
86
#define print_tag(str, tag, size)                       \
87
    av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
88
           str, tag & 0xff,                             \
89
           (tag >> 8) & 0xff,                           \
90
           (tag >> 16) & 0xff,                          \
91
           (tag >> 24) & 0xff,                          \
92
           size)
93

    
94
static inline int get_duration(AVIStream *ast, int len){
95
    if(ast->sample_size){
96
        return len;
97
    }else if (ast->dshow_block_align){
98
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
99
    }else
100
        return 1;
101
}
102

    
103
static int get_riff(AVFormatContext *s, AVIOContext *pb)
104
{
105
    AVIContext *avi = s->priv_data;
106
    char header[8];
107
    int i;
108

    
109
    /* check RIFF header */
110
    get_buffer(pb, header, 4);
111
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
112
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
113
    get_buffer(pb, header+4, 4);
114

    
115
    for(i=0; avi_headers[i][0]; i++)
116
        if(!memcmp(header, avi_headers[i], 8))
117
            break;
118
    if(!avi_headers[i][0])
119
        return -1;
120

    
121
    if(header[7] == 0x19)
122
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
123

    
124
    return 0;
125
}
126

    
127
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
128
    AVIContext *avi = s->priv_data;
129
    AVIOContext *pb = s->pb;
130
    int longs_pre_entry= get_le16(pb);
131
    int index_sub_type = get_byte(pb);
132
    int index_type     = get_byte(pb);
133
    int entries_in_use = get_le32(pb);
134
    int chunk_id       = get_le32(pb);
135
    int64_t base       = get_le64(pb);
136
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
137
    AVStream *st;
138
    AVIStream *ast;
139
    int i;
140
    int64_t last_pos= -1;
141
    int64_t filesize= url_fsize(s->pb);
142

    
143
#ifdef DEBUG_SEEK
144
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
145
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
146
#endif
147

    
148
    if(stream_id >= s->nb_streams || stream_id < 0)
149
        return -1;
150
    st= s->streams[stream_id];
151
    ast = st->priv_data;
152

    
153
    if(index_sub_type)
154
        return -1;
155

    
156
    get_le32(pb);
157

    
158
    if(index_type && longs_pre_entry != 2)
159
        return -1;
160
    if(index_type>1)
161
        return -1;
162

    
163
    if(filesize > 0 && base >= filesize){
164
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
165
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
166
            base &= 0xFFFFFFFF;
167
        else
168
            return -1;
169
    }
170

    
171
    for(i=0; i<entries_in_use; i++){
172
        if(index_type){
173
            int64_t pos= get_le32(pb) + base - 8;
174
            int len    = get_le32(pb);
175
            int key= len >= 0;
176
            len &= 0x7FFFFFFF;
177

    
178
#ifdef DEBUG_SEEK
179
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
180
#endif
181
            if(url_feof(pb))
182
                return -1;
183

    
184
            if(last_pos == pos || pos == base - 8)
185
                avi->non_interleaved= 1;
186
            if(last_pos != pos && (len || !ast->sample_size))
187
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
188

    
189
            ast->cum_len += get_duration(ast, len);
190
            last_pos= pos;
191
        }else{
192
            int64_t offset, pos;
193
            int duration;
194
            offset = get_le64(pb);
195
            get_le32(pb);       /* size */
196
            duration = get_le32(pb);
197

    
198
            if(url_feof(pb))
199
                return -1;
200

    
201
            pos = url_ftell(pb);
202

    
203
            if(avi->odml_depth > MAX_ODML_DEPTH){
204
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
205
                return -1;
206
            }
207

    
208
            url_fseek(pb, offset+8, SEEK_SET);
209
            avi->odml_depth++;
210
            read_braindead_odml_indx(s, frame_num);
211
            avi->odml_depth--;
212
            frame_num += duration;
213

    
214
            url_fseek(pb, pos, SEEK_SET);
215
        }
216
    }
217
    avi->index_loaded=1;
218
    return 0;
219
}
220

    
221
static void clean_index(AVFormatContext *s){
222
    int i;
223
    int64_t j;
224

    
225
    for(i=0; i<s->nb_streams; i++){
226
        AVStream *st = s->streams[i];
227
        AVIStream *ast = st->priv_data;
228
        int n= st->nb_index_entries;
229
        int max= ast->sample_size;
230
        int64_t pos, size, ts;
231

    
232
        if(n != 1 || ast->sample_size==0)
233
            continue;
234

    
235
        while(max < 1024) max+=max;
236

    
237
        pos= st->index_entries[0].pos;
238
        size= st->index_entries[0].size;
239
        ts= st->index_entries[0].timestamp;
240

    
241
        for(j=0; j<size; j+=max){
242
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
243
        }
244
    }
245
}
246

    
247
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
248
{
249
    AVIOContext *pb = s->pb;
250
    char key[5] = {0}, *value;
251

    
252
    size += (size & 1);
253

    
254
    if (size == UINT_MAX)
255
        return -1;
256
    value = av_malloc(size+1);
257
    if (!value)
258
        return -1;
259
    get_buffer(pb, value, size);
260
    value[size]=0;
261

    
262
    AV_WL32(key, tag);
263

    
264
    return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
265
                            AV_METADATA_DONT_STRDUP_VAL);
266
}
267

    
268
static void avi_read_info(AVFormatContext *s, uint64_t end)
269
{
270
    while (url_ftell(s->pb) < end) {
271
        uint32_t tag  = get_le32(s->pb);
272
        uint32_t size = get_le32(s->pb);
273
        avi_read_tag(s, NULL, tag, size);
274
    }
275
}
276

    
277
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
278
                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
279

    
280
static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
281
{
282
    char month[4], time[9], buffer[64];
283
    int i, day, year;
284
    /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
285
    if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
286
               month, &day, time, &year) == 4) {
287
        for (i=0; i<12; i++)
288
            if (!strcasecmp(month, months[i])) {
289
                snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
290
                         year, i+1, day, time);
291
                av_metadata_set2(metadata, "creation_time", buffer, 0);
292
            }
293
    } else if (date[4] == '/' && date[7] == '/') {
294
        date[4] = date[7] = '-';
295
        av_metadata_set2(metadata, "creation_time", date, 0);
296
    }
297
}
298

    
299
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
300
{
301
    while (url_ftell(s->pb) < end) {
302
        uint32_t tag  = get_le32(s->pb);
303
        uint32_t size = get_le32(s->pb);
304
        switch (tag) {
305
        case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
306
            uint64_t tag_end = url_ftell(s->pb) + size;
307
            while (url_ftell(s->pb) < tag_end) {
308
                uint16_t tag  = get_le16(s->pb);
309
                uint16_t size = get_le16(s->pb);
310
                const char *name = NULL;
311
                char buffer[64] = {0};
312
                size -= get_buffer(s->pb, buffer,
313
                                   FFMIN(size, sizeof(buffer)-1));
314
                switch (tag) {
315
                case 0x03:  name = "maker";  break;
316
                case 0x04:  name = "model";  break;
317
                case 0x13:  name = "creation_time";
318
                    if (buffer[4] == ':' && buffer[7] == ':')
319
                        buffer[4] = buffer[7] = '-';
320
                    break;
321
                }
322
                if (name)
323
                    av_metadata_set2(&s->metadata, name, buffer, 0);
324
                url_fskip(s->pb, size);
325
            }
326
            break;
327
        }
328
        default:
329
            url_fskip(s->pb, size);
330
            break;
331
        }
332
    }
333
}
334

    
335
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
336
{
337
    AVIContext *avi = s->priv_data;
338
    AVIOContext *pb = s->pb;
339
    unsigned int tag, tag1, handler;
340
    int codec_type, stream_index, frame_period, bit_rate;
341
    unsigned int size;
342
    int i;
343
    AVStream *st;
344
    AVIStream *ast = NULL;
345
    int avih_width=0, avih_height=0;
346
    int amv_file_format=0;
347
    uint64_t list_end = 0;
348

    
349
    avi->stream_index= -1;
350

    
351
    if (get_riff(s, pb) < 0)
352
        return -1;
353

    
354
    avi->fsize = url_fsize(pb);
355
    if(avi->fsize<=0)
356
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
357

    
358
    /* first list tag */
359
    stream_index = -1;
360
    codec_type = -1;
361
    frame_period = 0;
362
    for(;;) {
363
        if (url_feof(pb))
364
            goto fail;
365
        tag = get_le32(pb);
366
        size = get_le32(pb);
367

    
368
        print_tag("tag", tag, size);
369

    
370
        switch(tag) {
371
        case MKTAG('L', 'I', 'S', 'T'):
372
            list_end = url_ftell(pb) + size;
373
            /* Ignored, except at start of video packets. */
374
            tag1 = get_le32(pb);
375

    
376
            print_tag("list", tag1, 0);
377

    
378
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
379
                avi->movi_list = url_ftell(pb) - 4;
380
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
381
                else     avi->movi_end = url_fsize(pb);
382
                av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
383
                goto end_of_header;
384
            }
385
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
386
                avi_read_info(s, list_end);
387
            else if (tag1 == MKTAG('n', 'c', 'd', 't'))
388
                avi_read_nikon(s, list_end);
389

    
390
            break;
391
        case MKTAG('I', 'D', 'I', 'T'): {
392
            unsigned char date[64] = {0};
393
            size += (size & 1);
394
            size -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));
395
            url_fskip(pb, size);
396
            avi_metadata_creation_time(&s->metadata, date);
397
            break;
398
        }
399
        case MKTAG('d', 'm', 'l', 'h'):
400
            avi->is_odml = 1;
401
            url_fskip(pb, size + (size & 1));
402
            break;
403
        case MKTAG('a', 'm', 'v', 'h'):
404
            amv_file_format=1;
405
        case MKTAG('a', 'v', 'i', 'h'):
406
            /* AVI header */
407
            /* using frame_period is bad idea */
408
            frame_period = get_le32(pb);
409
            bit_rate = get_le32(pb) * 8;
410
            get_le32(pb);
411
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
412

    
413
            url_fskip(pb, 2 * 4);
414
            get_le32(pb);
415
            get_le32(pb);
416
            avih_width=get_le32(pb);
417
            avih_height=get_le32(pb);
418

    
419
            url_fskip(pb, size - 10 * 4);
420
            break;
421
        case MKTAG('s', 't', 'r', 'h'):
422
            /* stream header */
423

    
424
            tag1 = get_le32(pb);
425
            handler = get_le32(pb); /* codec tag */
426

    
427
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
428
                url_fskip(pb, size - 8);
429
                break;
430
            }else{
431
                stream_index++;
432
                st = av_new_stream(s, stream_index);
433
                if (!st)
434
                    goto fail;
435

    
436
                ast = av_mallocz(sizeof(AVIStream));
437
                if (!ast)
438
                    goto fail;
439
                st->priv_data = ast;
440
            }
441
            if(amv_file_format)
442
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
443

    
444
            print_tag("strh", tag1, -1);
445

    
446
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
447
                int64_t dv_dur;
448

    
449
                /*
450
                 * After some consideration -- I don't think we
451
                 * have to support anything but DV in type1 AVIs.
452
                 */
453
                if (s->nb_streams != 1)
454
                    goto fail;
455

    
456
                if (handler != MKTAG('d', 'v', 's', 'd') &&
457
                    handler != MKTAG('d', 'v', 'h', 'd') &&
458
                    handler != MKTAG('d', 'v', 's', 'l'))
459
                   goto fail;
460

    
461
                ast = s->streams[0]->priv_data;
462
                av_freep(&s->streams[0]->codec->extradata);
463
                av_freep(&s->streams[0]->codec);
464
                av_freep(&s->streams[0]);
465
                s->nb_streams = 0;
466
                if (CONFIG_DV_DEMUXER) {
467
                    avi->dv_demux = dv_init_demux(s);
468
                    if (!avi->dv_demux)
469
                        goto fail;
470
                }
471
                s->streams[0]->priv_data = ast;
472
                url_fskip(pb, 3 * 4);
473
                ast->scale = get_le32(pb);
474
                ast->rate = get_le32(pb);
475
                url_fskip(pb, 4);  /* start time */
476

    
477
                dv_dur = get_le32(pb);
478
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
479
                    dv_dur *= AV_TIME_BASE;
480
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
481
                }
482
                /*
483
                 * else, leave duration alone; timing estimation in utils.c
484
                 *      will make a guess based on bitrate.
485
                 */
486

    
487
                stream_index = s->nb_streams - 1;
488
                url_fskip(pb, size - 9*4);
489
                break;
490
            }
491

    
492
            assert(stream_index < s->nb_streams);
493
            st->codec->stream_codec_tag= handler;
494

    
495
            get_le32(pb); /* flags */
496
            get_le16(pb); /* priority */
497
            get_le16(pb); /* language */
498
            get_le32(pb); /* initial frame */
499
            ast->scale = get_le32(pb);
500
            ast->rate = get_le32(pb);
501
            if(!(ast->scale && ast->rate)){
502
                av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
503
                if(frame_period){
504
                    ast->rate = 1000000;
505
                    ast->scale = frame_period;
506
                }else{
507
                    ast->rate = 25;
508
                    ast->scale = 1;
509
                }
510
            }
511
            av_set_pts_info(st, 64, ast->scale, ast->rate);
512

    
513
            ast->cum_len=get_le32(pb); /* start */
514
            st->nb_frames = get_le32(pb);
515

    
516
            st->start_time = 0;
517
            get_le32(pb); /* buffer size */
518
            get_le32(pb); /* quality */
519
            ast->sample_size = get_le32(pb); /* sample ssize */
520
            ast->cum_len *= FFMAX(1, ast->sample_size);
521
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
522

    
523
            switch(tag1) {
524
            case MKTAG('v', 'i', 'd', 's'):
525
                codec_type = AVMEDIA_TYPE_VIDEO;
526

    
527
                ast->sample_size = 0;
528
                break;
529
            case MKTAG('a', 'u', 'd', 's'):
530
                codec_type = AVMEDIA_TYPE_AUDIO;
531
                break;
532
            case MKTAG('t', 'x', 't', 's'):
533
                codec_type = AVMEDIA_TYPE_SUBTITLE;
534
                break;
535
            case MKTAG('d', 'a', 't', 's'):
536
                codec_type = AVMEDIA_TYPE_DATA;
537
                break;
538
            default:
539
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
540
                goto fail;
541
            }
542
            if(ast->sample_size == 0)
543
                st->duration = st->nb_frames;
544
            ast->frame_offset= ast->cum_len;
545
            url_fskip(pb, size - 12 * 4);
546
            break;
547
        case MKTAG('s', 't', 'r', 'f'):
548
            /* stream header */
549
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
550
                url_fskip(pb, size);
551
            } else {
552
                uint64_t cur_pos = url_ftell(pb);
553
                if (cur_pos < list_end)
554
                    size = FFMIN(size, list_end - cur_pos);
555
                st = s->streams[stream_index];
556
                switch(codec_type) {
557
                case AVMEDIA_TYPE_VIDEO:
558
                    if(amv_file_format){
559
                        st->codec->width=avih_width;
560
                        st->codec->height=avih_height;
561
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
562
                        st->codec->codec_id = CODEC_ID_AMV;
563
                        url_fskip(pb, size);
564
                        break;
565
                    }
566
                    tag1 = ff_get_bmp_header(pb, st);
567

    
568
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
569
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
570
                        st->codec->codec_tag = tag1;
571
                        st->codec->codec_id = CODEC_ID_XSUB;
572
                        break;
573
                    }
574

    
575
                    if(size > 10*4 && size<(1<<30)){
576
                        st->codec->extradata_size= size - 10*4;
577
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
578
                        if (!st->codec->extradata) {
579
                            st->codec->extradata_size= 0;
580
                            return AVERROR(ENOMEM);
581
                        }
582
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
583
                    }
584

    
585
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
586
                        get_byte(pb);
587

    
588
                    /* Extract palette from extradata if bpp <= 8. */
589
                    /* This code assumes that extradata contains only palette. */
590
                    /* This is true for all paletted codecs implemented in FFmpeg. */
591
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
592
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
593
#if HAVE_BIGENDIAN
594
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
595
                            st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
596
#else
597
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
598
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
599
#endif
600
                        st->codec->palctrl->palette_changed = 1;
601
                    }
602

    
603
                    print_tag("video", tag1, 0);
604

    
605
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
606
                    st->codec->codec_tag = tag1;
607
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
608
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
609
                    // Support "Resolution 1:1" for Avid AVI Codec
610
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
611
                       st->codec->extradata_size >= 31 &&
612
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
613
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
614

    
615
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
616
                        st->codec->extradata_size+= 9;
617
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
618
                        if(st->codec->extradata)
619
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
620
                    }
621
                    st->codec->height= FFABS(st->codec->height);
622

    
623
//                    url_fskip(pb, size - 5 * 4);
624
                    break;
625
                case AVMEDIA_TYPE_AUDIO:
626
                    ff_get_wav_header(pb, st->codec, size);
627
                    ast->dshow_block_align= st->codec->block_align;
628
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
629
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
630
                        ast->sample_size= st->codec->block_align;
631
                    }
632
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
633
                        url_fskip(pb, 1);
634
                    /* Force parsing as several audio frames can be in
635
                     * one packet and timestamps refer to packet start. */
636
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
637
                    /* ADTS header is in extradata, AAC without header must be
638
                     * stored as exact frames. Parser not needed and it will
639
                     * fail. */
640
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
641
                        st->need_parsing = AVSTREAM_PARSE_NONE;
642
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
643
                     * audio in the header but have Axan as stream_code_tag. */
644
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
645
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
646
                        st->codec->codec_tag = 0;
647
                    }
648
                    if (amv_file_format){
649
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
650
                        ast->dshow_block_align = 0;
651
                    }
652
                    break;
653
                case AVMEDIA_TYPE_SUBTITLE:
654
                    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
655
                    st->codec->codec_id   = CODEC_ID_PROBE;
656
                    break;
657
                default:
658
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
659
                    st->codec->codec_id= CODEC_ID_NONE;
660
                    st->codec->codec_tag= 0;
661
                    url_fskip(pb, size);
662
                    break;
663
                }
664
            }
665
            break;
666
        case MKTAG('i', 'n', 'd', 'x'):
667
            i= url_ftell(pb);
668
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
669
                read_braindead_odml_indx(s, 0);
670
            }
671
            url_fseek(pb, i+size, SEEK_SET);
672
            break;
673
        case MKTAG('v', 'p', 'r', 'p'):
674
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
675
                AVRational active, active_aspect;
676

    
677
                st = s->streams[stream_index];
678
                get_le32(pb);
679
                get_le32(pb);
680
                get_le32(pb);
681
                get_le32(pb);
682
                get_le32(pb);
683

    
684
                active_aspect.den= get_le16(pb);
685
                active_aspect.num= get_le16(pb);
686
                active.num       = get_le32(pb);
687
                active.den       = get_le32(pb);
688
                get_le32(pb); //nbFieldsPerFrame
689

    
690
                if(active_aspect.num && active_aspect.den && active.num && active.den){
691
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
692
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
693
                }
694
                size -= 9*4;
695
            }
696
            url_fseek(pb, size, SEEK_CUR);
697
            break;
698
        case MKTAG('s', 't', 'r', 'n'):
699
            if(s->nb_streams){
700
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
701
                break;
702
            }
703
        default:
704
            if(size > 1000000){
705
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
706
                                        "I will ignore it and try to continue anyway.\n");
707
                avi->movi_list = url_ftell(pb) - 4;
708
                avi->movi_end  = url_fsize(pb);
709
                goto end_of_header;
710
            }
711
            /* skip tag */
712
            size += (size & 1);
713
            url_fskip(pb, size);
714
            break;
715
        }
716
    }
717
 end_of_header:
718
    /* check stream number */
719
    if (stream_index != s->nb_streams - 1) {
720
    fail:
721
        return -1;
722
    }
723

    
724
    if(!avi->index_loaded && !url_is_streamed(pb))
725
        avi_load_index(s);
726
    avi->index_loaded = 1;
727
    avi->non_interleaved |= guess_ni_flag(s);
728
    for(i=0; i<s->nb_streams; i++){
729
        AVStream *st = s->streams[i];
730
        if(st->nb_index_entries)
731
            break;
732
    }
733
    if(i==s->nb_streams && avi->non_interleaved) {
734
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
735
        avi->non_interleaved=0;
736
    }
737

    
738
    if(avi->non_interleaved) {
739
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
740
        clean_index(s);
741
    }
742

    
743
    ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
744

    
745
    return 0;
746
}
747

    
748
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
749
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
750
        uint8_t desc[256];
751
        int score = AVPROBE_SCORE_MAX / 2, ret;
752
        AVIStream *ast = st->priv_data;
753
        AVInputFormat *sub_demuxer;
754
        AVRational time_base;
755
        AVIOContext *pb = avio_alloc_context( pkt->data + 7,
756
                                              pkt->size - 7,
757
                                              0, NULL, NULL, NULL, NULL);
758
        AVProbeData pd;
759
        unsigned int desc_len = get_le32(pb);
760

    
761
        if (desc_len > pb->buf_end - pb->buf_ptr)
762
            goto error;
763

    
764
        ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
765
        url_fskip(pb, desc_len - ret);
766
        if (*desc)
767
            av_metadata_set2(&st->metadata, "title", desc, 0);
768

    
769
        get_le16(pb);   /* flags? */
770
        get_le32(pb);   /* data size */
771

    
772
        pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
773
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
774
            goto error;
775

    
776
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
777
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
778
            *st->codec = *ast->sub_ctx->streams[0]->codec;
779
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
780
            time_base = ast->sub_ctx->streams[0]->time_base;
781
            av_set_pts_info(st, 64, time_base.num, time_base.den);
782
        }
783
        ast->sub_buffer = pkt->data;
784
        memset(pkt, 0, sizeof(*pkt));
785
        return 1;
786
error:
787
        av_freep(&pb);
788
    }
789
    return 0;
790
}
791

    
792
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
793
                                  AVPacket *pkt)
794
{
795
    AVIStream *ast, *next_ast = next_st->priv_data;
796
    int64_t ts, next_ts, ts_min = INT64_MAX;
797
    AVStream *st, *sub_st = NULL;
798
    int i;
799

    
800
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
801
                           AV_TIME_BASE_Q);
802

    
803
    for (i=0; i<s->nb_streams; i++) {
804
        st  = s->streams[i];
805
        ast = st->priv_data;
806
        if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
807
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
808
            if (ts <= next_ts && ts < ts_min) {
809
                ts_min = ts;
810
                sub_st = st;
811
            }
812
        }
813
    }
814

    
815
    if (sub_st) {
816
        ast = sub_st->priv_data;
817
        *pkt = ast->sub_pkt;
818
        pkt->stream_index = sub_st->index;
819
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
820
            ast->sub_pkt.data = NULL;
821
    }
822
    return sub_st;
823
}
824

    
825
static int get_stream_idx(int *d){
826
    if(    d[0] >= '0' && d[0] <= '9'
827
        && d[1] >= '0' && d[1] <= '9'){
828
        return (d[0] - '0') * 10 + (d[1] - '0');
829
    }else{
830
        return 100; //invalid stream ID
831
    }
832
}
833

    
834
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
835
{
836
    AVIContext *avi = s->priv_data;
837
    AVIOContext *pb = s->pb;
838
    int n, d[8];
839
    unsigned int size;
840
    int64_t i, sync;
841
    void* dstr;
842

    
843
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
844
        int size = dv_get_packet(avi->dv_demux, pkt);
845
        if (size >= 0)
846
            return size;
847
    }
848

    
849
    if(avi->non_interleaved){
850
        int best_stream_index = 0;
851
        AVStream *best_st= NULL;
852
        AVIStream *best_ast;
853
        int64_t best_ts= INT64_MAX;
854
        int i;
855

    
856
        for(i=0; i<s->nb_streams; i++){
857
            AVStream *st = s->streams[i];
858
            AVIStream *ast = st->priv_data;
859
            int64_t ts= ast->frame_offset;
860
            int64_t last_ts;
861

    
862
            if(!st->nb_index_entries)
863
                continue;
864

    
865
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
866
            if(!ast->remaining && ts > last_ts)
867
                continue;
868

    
869
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
870

    
871
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
872
            if(ts < best_ts){
873
                best_ts= ts;
874
                best_st= st;
875
                best_stream_index= i;
876
            }
877
        }
878
        if(!best_st)
879
            return -1;
880

    
881
        best_ast = best_st->priv_data;
882
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
883
        if(best_ast->remaining)
884
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
885
        else{
886
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
887
            if(i>=0)
888
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
889
        }
890

    
891
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
892
        if(i>=0){
893
            int64_t pos= best_st->index_entries[i].pos;
894
            pos += best_ast->packet_size - best_ast->remaining;
895
            url_fseek(s->pb, pos + 8, SEEK_SET);
896
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
897

    
898
            assert(best_ast->remaining <= best_ast->packet_size);
899

    
900
            avi->stream_index= best_stream_index;
901
            if(!best_ast->remaining)
902
                best_ast->packet_size=
903
                best_ast->remaining= best_st->index_entries[i].size;
904
        }
905
    }
906

    
907
resync:
908
    if(avi->stream_index >= 0){
909
        AVStream *st= s->streams[ avi->stream_index ];
910
        AVIStream *ast= st->priv_data;
911
        int size, err;
912

    
913
        if(get_subtitle_pkt(s, st, pkt))
914
            return 0;
915

    
916
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
917
            size= INT_MAX;
918
        else if(ast->sample_size < 32)
919
            // arbitrary multiplier to avoid tiny packets for raw PCM data
920
            size= 1024*ast->sample_size;
921
        else
922
            size= ast->sample_size;
923

    
924
        if(size > ast->remaining)
925
            size= ast->remaining;
926
        avi->last_pkt_pos= url_ftell(pb);
927
        err= av_get_packet(pb, pkt, size);
928
        if(err<0)
929
            return err;
930

    
931
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
932
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
933
            if(ptr){
934
            ast->has_pal=0;
935
            pkt->size += 4*256;
936
            pkt->data= ptr;
937
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
938
            }else
939
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
940
        }
941

    
942
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
943
            dstr = pkt->destruct;
944
            size = dv_produce_packet(avi->dv_demux, pkt,
945
                                    pkt->data, pkt->size);
946
            pkt->destruct = dstr;
947
            pkt->flags |= AV_PKT_FLAG_KEY;
948
            if (size < 0)
949
                av_free_packet(pkt);
950
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
951
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
952
            ast->frame_offset++;
953
            avi->stream_index = -1;
954
            ast->remaining = 0;
955
            goto resync;
956
        } else {
957
            /* XXX: How to handle B-frames in AVI? */
958
            pkt->dts = ast->frame_offset;
959
//                pkt->dts += ast->start;
960
            if(ast->sample_size)
961
                pkt->dts /= ast->sample_size;
962
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
963
            pkt->stream_index = avi->stream_index;
964

    
965
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
966
                AVIndexEntry *e;
967
                int index;
968
                assert(st->index_entries);
969

    
970
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
971
                e= &st->index_entries[index];
972

    
973
                if(index >= 0 && e->timestamp == ast->frame_offset){
974
                    if (e->flags & AVINDEX_KEYFRAME)
975
                        pkt->flags |= AV_PKT_FLAG_KEY;
976
                }
977
            } else {
978
                pkt->flags |= AV_PKT_FLAG_KEY;
979
            }
980
            ast->frame_offset += get_duration(ast, pkt->size);
981
        }
982
        ast->remaining -= size;
983
        if(!ast->remaining){
984
            avi->stream_index= -1;
985
            ast->packet_size= 0;
986
        }
987

    
988
        return size;
989
    }
990

    
991
    memset(d, -1, sizeof(int)*8);
992
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
993
        int j;
994

    
995
        for(j=0; j<7; j++)
996
            d[j]= d[j+1];
997
        d[7]= get_byte(pb);
998

    
999
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1000

    
1001
        n= get_stream_idx(d+2);
1002
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1003
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
1004
            continue;
1005

    
1006
        //parse ix##
1007
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1008
        //parse JUNK
1009
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1010
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1011
            url_fskip(pb, size);
1012
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
1013
            goto resync;
1014
        }
1015

    
1016
        //parse stray LIST
1017
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1018
            url_fskip(pb, 4);
1019
            goto resync;
1020
        }
1021

    
1022
        n= get_stream_idx(d);
1023

    
1024
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1025
            continue;
1026

    
1027
        //detect ##ix chunk and skip
1028
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1029
            url_fskip(pb, size);
1030
            goto resync;
1031
        }
1032

    
1033
        //parse ##dc/##wb
1034
        if(n < s->nb_streams){
1035
            AVStream *st;
1036
            AVIStream *ast;
1037
            st = s->streams[n];
1038
            ast = st->priv_data;
1039

    
1040
            if(s->nb_streams>=2){
1041
                AVStream *st1  = s->streams[1];
1042
                AVIStream *ast1= st1->priv_data;
1043
                //workaround for broken small-file-bug402.avi
1044
                if(   d[2] == 'w' && d[3] == 'b'
1045
                   && n==0
1046
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1047
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1048
                   && ast->prefix == 'd'*256+'c'
1049
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1050
                  ){
1051
                    n=1;
1052
                    st = st1;
1053
                    ast = ast1;
1054
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1055
                }
1056
            }
1057

    
1058

    
1059
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1060
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1061
               || st->discard >= AVDISCARD_ALL){
1062
                ast->frame_offset += get_duration(ast, size);
1063
                url_fskip(pb, size);
1064
                goto resync;
1065
            }
1066

    
1067
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1068
                int k = get_byte(pb);
1069
                int last = (k + get_byte(pb) - 1) & 0xFF;
1070

    
1071
                get_le16(pb); //flags
1072

    
1073
                for (; k <= last; k++)
1074
                    ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
1075
                ast->has_pal= 1;
1076
                goto resync;
1077
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1078
                         d[2]*256+d[3] == ast->prefix /*||
1079
                         (d[2] == 'd' && d[3] == 'c') ||
1080
                         (d[2] == 'w' && d[3] == 'b')*/) {
1081

    
1082
//av_log(s, AV_LOG_DEBUG, "OK\n");
1083
                if(d[2]*256+d[3] == ast->prefix)
1084
                    ast->prefix_count++;
1085
                else{
1086
                    ast->prefix= d[2]*256+d[3];
1087
                    ast->prefix_count= 0;
1088
                }
1089

    
1090
                avi->stream_index= n;
1091
                ast->packet_size= size + 8;
1092
                ast->remaining= size;
1093

    
1094
                if(size || !ast->sample_size){
1095
                    uint64_t pos= url_ftell(pb) - 8;
1096
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1097
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1098
                    }
1099
                }
1100
                goto resync;
1101
            }
1102
        }
1103
    }
1104

    
1105
    return AVERROR_EOF;
1106
}
1107

    
1108
/* XXX: We make the implicit supposition that the positions are sorted
1109
   for each stream. */
1110
static int avi_read_idx1(AVFormatContext *s, int size)
1111
{
1112
    AVIContext *avi = s->priv_data;
1113
    AVIOContext *pb = s->pb;
1114
    int nb_index_entries, i;
1115
    AVStream *st;
1116
    AVIStream *ast;
1117
    unsigned int index, tag, flags, pos, len;
1118
    unsigned last_pos= -1;
1119

    
1120
    nb_index_entries = size / 16;
1121
    if (nb_index_entries <= 0)
1122
        return -1;
1123

    
1124
    /* Read the entries and sort them in each stream component. */
1125
    for(i = 0; i < nb_index_entries; i++) {
1126
        tag = get_le32(pb);
1127
        flags = get_le32(pb);
1128
        pos = get_le32(pb);
1129
        len = get_le32(pb);
1130
#if defined(DEBUG_SEEK)
1131
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1132
               i, tag, flags, pos, len);
1133
#endif
1134
        if(i==0 && pos > avi->movi_list)
1135
            avi->movi_list= 0; //FIXME better check
1136
        pos += avi->movi_list;
1137

    
1138
        index = ((tag & 0xff) - '0') * 10;
1139
        index += ((tag >> 8) & 0xff) - '0';
1140
        if (index >= s->nb_streams)
1141
            continue;
1142
        st = s->streams[index];
1143
        ast = st->priv_data;
1144

    
1145
#if defined(DEBUG_SEEK)
1146
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1147
#endif
1148
        if(url_feof(pb))
1149
            return -1;
1150

    
1151
        if(last_pos == pos)
1152
            avi->non_interleaved= 1;
1153
        else if(len || !ast->sample_size)
1154
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1155
        ast->cum_len += get_duration(ast, len);
1156
        last_pos= pos;
1157
    }
1158
    return 0;
1159
}
1160

    
1161
static int guess_ni_flag(AVFormatContext *s){
1162
    int i;
1163
    int64_t last_start=0;
1164
    int64_t first_end= INT64_MAX;
1165
    int64_t oldpos= url_ftell(s->pb);
1166

    
1167
    for(i=0; i<s->nb_streams; i++){
1168
        AVStream *st = s->streams[i];
1169
        int n= st->nb_index_entries;
1170
        unsigned int size;
1171

    
1172
        if(n <= 0)
1173
            continue;
1174

    
1175
        if(n >= 2){
1176
            int64_t pos= st->index_entries[0].pos;
1177
            url_fseek(s->pb, pos + 4, SEEK_SET);
1178
            size= get_le32(s->pb);
1179
            if(pos + size > st->index_entries[1].pos)
1180
                last_start= INT64_MAX;
1181
        }
1182

    
1183
        if(st->index_entries[0].pos > last_start)
1184
            last_start= st->index_entries[0].pos;
1185
        if(st->index_entries[n-1].pos < first_end)
1186
            first_end= st->index_entries[n-1].pos;
1187
    }
1188
    url_fseek(s->pb, oldpos, SEEK_SET);
1189
    return last_start > first_end;
1190
}
1191

    
1192
static int avi_load_index(AVFormatContext *s)
1193
{
1194
    AVIContext *avi = s->priv_data;
1195
    AVIOContext *pb = s->pb;
1196
    uint32_t tag, size;
1197
    int64_t pos= url_ftell(pb);
1198
    int ret = -1;
1199

    
1200
    if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1201
        goto the_end; // maybe truncated file
1202
#ifdef DEBUG_SEEK
1203
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1204
#endif
1205
    for(;;) {
1206
        if (url_feof(pb))
1207
            break;
1208
        tag = get_le32(pb);
1209
        size = get_le32(pb);
1210
#ifdef DEBUG_SEEK
1211
        printf("tag=%c%c%c%c size=0x%x\n",
1212
               tag & 0xff,
1213
               (tag >> 8) & 0xff,
1214
               (tag >> 16) & 0xff,
1215
               (tag >> 24) & 0xff,
1216
               size);
1217
#endif
1218
        switch(tag) {
1219
        case MKTAG('i', 'd', 'x', '1'):
1220
            if (avi_read_idx1(s, size) < 0)
1221
                goto skip;
1222
            ret = 0;
1223
                goto the_end;
1224
            break;
1225
        default:
1226
        skip:
1227
            size += (size & 1);
1228
            if (url_fseek(pb, size, SEEK_CUR) < 0)
1229
                goto the_end; // something is wrong here
1230
            break;
1231
        }
1232
    }
1233
 the_end:
1234
    url_fseek(pb, pos, SEEK_SET);
1235
    return ret;
1236
}
1237

    
1238
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1239
{
1240
    AVIStream *ast2 = st2->priv_data;
1241
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1242
    av_free_packet(&ast2->sub_pkt);
1243
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1244
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1245
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1246
}
1247

    
1248
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1249
{
1250
    AVIContext *avi = s->priv_data;
1251
    AVStream *st;
1252
    int i, index;
1253
    int64_t pos;
1254
    AVIStream *ast;
1255

    
1256
    if (!avi->index_loaded) {
1257
        /* we only load the index on demand */
1258
        avi_load_index(s);
1259
        avi->index_loaded = 1;
1260
    }
1261
    assert(stream_index>= 0);
1262

    
1263
    st = s->streams[stream_index];
1264
    ast= st->priv_data;
1265
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1266
    if(index<0)
1267
        return -1;
1268

    
1269
    /* find the position */
1270
    pos = st->index_entries[index].pos;
1271
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1272

    
1273
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1274

    
1275
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1276
        /* One and only one real stream for DV in AVI, and it has video  */
1277
        /* offsets. Calling with other stream indexes should have failed */
1278
        /* the av_index_search_timestamp call above.                     */
1279
        assert(stream_index == 0);
1280

    
1281
        /* Feed the DV video stream version of the timestamp to the */
1282
        /* DV demux so it can synthesize correct timestamps.        */
1283
        dv_offset_reset(avi->dv_demux, timestamp);
1284

    
1285
        url_fseek(s->pb, pos, SEEK_SET);
1286
        avi->stream_index= -1;
1287
        return 0;
1288
    }
1289

    
1290
    for(i = 0; i < s->nb_streams; i++) {
1291
        AVStream *st2 = s->streams[i];
1292
        AVIStream *ast2 = st2->priv_data;
1293

    
1294
        ast2->packet_size=
1295
        ast2->remaining= 0;
1296

    
1297
        if (ast2->sub_ctx) {
1298
            seek_subtitle(st, st2, timestamp);
1299
            continue;
1300
        }
1301

    
1302
        if (st2->nb_index_entries <= 0)
1303
            continue;
1304

    
1305
//        assert(st2->codec->block_align);
1306
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1307
        index = av_index_search_timestamp(
1308
                st2,
1309
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1310
                flags | AVSEEK_FLAG_BACKWARD);
1311
        if(index<0)
1312
            index=0;
1313

    
1314
        if(!avi->non_interleaved){
1315
            while(index>0 && st2->index_entries[index].pos > pos)
1316
                index--;
1317
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1318
                index++;
1319
        }
1320

    
1321
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1322
        /* extract the current frame number */
1323
        ast2->frame_offset = st2->index_entries[index].timestamp;
1324
    }
1325

    
1326
    /* do the seek */
1327
    url_fseek(s->pb, pos, SEEK_SET);
1328
    avi->stream_index= -1;
1329
    return 0;
1330
}
1331

    
1332
static int avi_read_close(AVFormatContext *s)
1333
{
1334
    int i;
1335
    AVIContext *avi = s->priv_data;
1336

    
1337
    for(i=0;i<s->nb_streams;i++) {
1338
        AVStream *st = s->streams[i];
1339
        AVIStream *ast = st->priv_data;
1340
        av_free(st->codec->palctrl);
1341
        if (ast) {
1342
            if (ast->sub_ctx) {
1343
                av_freep(&ast->sub_ctx->pb);
1344
                av_close_input_stream(ast->sub_ctx);
1345
            }
1346
            av_free(ast->sub_buffer);
1347
            av_free_packet(&ast->sub_pkt);
1348
        }
1349
    }
1350

    
1351
    av_free(avi->dv_demux);
1352

    
1353
    return 0;
1354
}
1355

    
1356
static int avi_probe(AVProbeData *p)
1357
{
1358
    int i;
1359

    
1360
    /* check file header */
1361
    for(i=0; avi_headers[i][0]; i++)
1362
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1363
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1364
            return AVPROBE_SCORE_MAX;
1365

    
1366
    return 0;
1367
}
1368

    
1369
AVInputFormat ff_avi_demuxer = {
1370
    "avi",
1371
    NULL_IF_CONFIG_SMALL("AVI format"),
1372
    sizeof(AVIContext),
1373
    avi_probe,
1374
    avi_read_header,
1375
    avi_read_packet,
1376
    avi_read_close,
1377
    avi_read_seek,
1378
};