Revision d3c0de86 libavformat/wtv.c

View differences:

libavformat/wtv.c
1 1
/*
2 2
 * Windows Television (WTV) demuxer
3
 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
3
 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4 4
 *
5 5
 * This file is part of FFmpeg.
6 6
 *
......
26 26
 */
27 27

  
28 28
#include "libavutil/intreadwrite.h"
29
#include "libavutil/intfloat_readwrite.h"
29 30
#include "avformat.h"
30 31
#include "riff.h"
31 32
#include "asf.h"
......
37 38
#define ARG_GUID(g) \
38 39
    g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
39 40

  
41
#define PRI_PRETTY_GUID \
42
    "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
43
#define ARG_PRETTY_GUID(g) \
44
    AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
45
#define LEN_PRETTY_GUID 34
46

  
47
/*
48
 *
49
 * File system routines
50
 *
51
 */
52

  
53
#define WTV_SECTOR_BITS    12
54
#define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
55
#define WTV_BIGSECTOR_BITS 18
56

  
40 57
typedef struct {
41
    int seen_data;
42
} WtvStream;
58
    ByteIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
43 59

  
44
typedef struct WtvContext {
45
    uint64_t pts;
46
} WtvContext;
60
    int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
61
    uint32_t *sectors;   /** file allocation table */
62
    int nb_sectors;      /** number of sectors */
63

  
64
    int error;
65
    int64_t position;
66
    int64_t length;
67
} WtvFile;
68

  
69
/**
70
 * @return bytes read, 0 on end of file, or <0 on error
71
 */
72
static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
73
{
74
    WtvFile *wf = opaque;
75
    ByteIOContext *pb = wf->pb_filesystem;
76
    int nread = 0;
77

  
78
    if (wf->error || url_ferror(pb))
79
        return -1;
80
    if (wf->position >= wf->length || url_feof(pb))
81
        return 0;
82

  
83
    buf_size = FFMIN(buf_size, wf->length - wf->position);
84
    while(nread < buf_size) {
85
        int n;
86
        int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
87
        int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
88

  
89
        n = get_buffer(pb, buf, read_request);
90
        if (n <= 0)
91
            break;
92
        nread += n;
93
        buf += n;
94
        wf->position += n;
95
        if (n == remaining_in_sector) {
96
            int i = wf->position >> wf->sector_bits;
97
            if (i >= wf->nb_sectors ||
98
                (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
99
                url_fseek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
100
                wf->error = 1;
101
                break;
102
            }
103
        }
104
    }
105
    return nread;
106
}
107

  
108
/**
109
 * @return position (or file length)
110
 */
111
static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
112
{
113
    WtvFile *wf = opaque;
114
    ByteIOContext *pb = wf->pb_filesystem;
115

  
116
    if (whence == AVSEEK_SIZE)
117
        return wf->length;
118
    else if (whence == SEEK_CUR)
119
        offset = wf->position + offset;
120
    else if (whence == SEEK_END)
121
        offset = wf->length;
122

  
123
    wf->error = offset < 0 || offset >= wf->length ||
124
                url_fseek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
125
                              + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
126
    wf->position = offset;
127
    return offset;
128
}
129

  
130
/**
131
 * read non-zero integers (le32) from input stream
132
 * @param pb
133
 * @param[out] data destination
134
 * @param     count maximum number of integers to read
135
 * @return    total number of integers read
136
 */
137
static int read_ints(ByteIOContext *pb, uint32_t *data, int count)
138
{
139
    int i, total = 0;
140
    for (i = 0; i < count; i++) {
141
        if ((data[total] = get_le32(pb)))
142
           total++;
143
    }
144
    return total;
145
}
146

  
147
/**
148
 * Open file
149
 * @param first_sector  First sector
150
 * @param length        Length of file (bytes)
151
 * @param depth         File allocation table depth
152
 * @return NULL on error
153
 */
154
static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
155
{
156
    ByteIOContext *pb;
157
    WtvFile *wf;
158
    uint8_t *buffer;
159

  
160
    if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
161
        return NULL;
162

  
163
    wf = av_mallocz(sizeof(WtvFile));
164
    if (!wf)
165
        return NULL;
166

  
167
    if (depth == 0) {
168
        wf->sectors = av_malloc(sizeof(uint32_t));
169
        if (!wf->sectors) {
170
            av_free(wf);
171
            return NULL;
172
        }
173
        wf->sectors[0]  = first_sector;
174
        wf->nb_sectors  = 1;
175
        wf->sector_bits = WTV_SECTOR_BITS;
176
    } else if (depth == 1) {
177
        wf->sectors = av_malloc(WTV_SECTOR_SIZE);
178
        if (!wf->sectors) {
179
            av_free(wf);
180
            return NULL;
181
        }
182
        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
183
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
184
    } else if (depth == 2) {
185
        uint32_t sectors1[WTV_SECTOR_SIZE / 4];
186
        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
187
        int i;
188

  
189
        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
190
        if (!wf->sectors) {
191
            av_free(wf);
192
            return NULL;
193
        }
194
        wf->nb_sectors = 0;
195
        for (i = 0; i < nb_sectors1; i++) {
196
            if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
197
                break;
198
            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
199
        }
200
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
201
    } else {
202
        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
203
        av_free(wf);
204
        return NULL;
205
    }
206

  
207
    if (!wf->nb_sectors) {
208
        av_free(wf->sectors);
209
        av_free(wf);
210
        return NULL;
211
    }
212

  
213
    /* check length */
214
    length &= 0xFFFFFFFFFFFF;
215
    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
216
        av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
217
        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
218
    }
219
    wf->length = length;
220

  
221
    /* seek to intial sector */
222
    wf->position = 0;
223
    if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
224
        av_free(wf->sectors);
225
        av_free(wf);
226
        return NULL;
227
    }
228

  
229
    wf->pb_filesystem = s->pb;
230
    buffer = av_malloc(1 << wf->sector_bits);
231
    if (!buffer) {
232
        av_free(wf->sectors);
233
        av_free(wf);
234
        return NULL;
235
    }
47 236

  
48
static int is_zero(uint8_t *v, int n)
237
    pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,
238
                           wtvfile_read_packet, NULL, wtvfile_seek);
239
    if (!pb) {
240
        av_free(buffer);
241
        av_free(wf->sectors);
242
        av_free(wf);
243
    }
244
    return pb;
245
}
246

  
247
static const ff_asf_guid dir_entry_guid =
248
    {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
249

  
250
/**
251
 * Open file using filename
252
 * @param[in]  buf       directory buffer
253
 * @param      buf_size  directory buffer size
254
 * @param[in]  filename
255
 * @param      filename_size size of filename
256
 * @return NULL on error
257
 */
258
static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
49 259
{
50
   int i;
51
   for (i = 0; i < n; i++)
52
      if (v[i]) return 0;
53
   return 1;
260
    const uint8_t *buf_end = buf + buf_size;
261

  
262
    while(buf + 48 <= buf_end) {
263
        int dir_length, name_size, first_sector, depth;
264
        uint64_t file_length;
265
        const uint8_t *name;
266
        if (ff_guidcmp(buf, dir_entry_guid)) {
267
            av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
268
                   "remaining directory entries ignored\n", ARG_GUID(buf));
269
            break;
270
        }
271
        dir_length  = AV_RL16(buf + 16);
272
        file_length = AV_RL64(buf + 24);
273
        name_size   = 2 * AV_RL32(buf + 32);
274
        if (buf + 48 + name_size > buf_end) {
275
            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
276
            break;
277
        }
278
        first_sector = AV_RL32(buf + 40 + name_size);
279
        depth        = AV_RL32(buf + 44 + name_size);
280

  
281
        /* compare file name; test optional null terminator */
282
        name = buf + 40;
283
        if (name_size >= filename_size &&
284
            !memcmp(name, filename, filename_size) &&
285
            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
286
            return wtvfile_open_sector(first_sector, file_length, depth, s);
287

  
288
        buf += dir_length;
289
    }
290
    return 0;
54 291
}
55 292

  
293
#define wtvfile_open(s, buf, buf_size, filename) \
294
    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
295

  
296
/**
297
 * Close file opened with wtvfile_open_sector(), or wtv_open()
298
 */
299
static void wtvfile_close(ByteIOContext *pb)
300
{
301
    WtvFile *wf = pb->opaque;
302
    av_free(wf->sectors);
303
    av_free(pb);
304
}
305

  
306
/*
307
 *
308
 * Main demuxer
309
 *
310
 */
311

  
312
typedef struct {
313
    int seen_data;
314
} WtvStream;
315

  
316
typedef struct {
317
    ByteIOContext *pb;       /** timeline file */
318
    int64_t epoch;
319
    int64_t pts;             /** pts for next data chunk */
320
    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
321

  
322
    /* maintain private seek index, as the AVIndexEntry->pos is relative to the
323
       start of the 'timeline' file, not the file system (AVFormatContext->pb) */
324
    AVIndexEntry *index_entries;
325
    int nb_index_entries;
326
    unsigned int index_entries_allocated_size;
327
} WtvContext;
328

  
56 329
typedef struct {
57 330
    enum CodecID id;
58 331
    ff_asf_guid guid;
......
71 344
/* WTV GUIDs */
72 345
static const ff_asf_guid wtv_guid =
73 346
    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
74
static const ff_asf_guid meta_guid =
347
static const ff_asf_guid metadata_guid =
75 348
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
76 349
static const ff_asf_guid timestamp_guid =
77 350
    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
......
159 432
}
160 433

  
161 434
/**
435
 * Convert win32 FILETIME to ISO-8601 string
436
 */
437
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
438
{
439
    time_t t = (value / 10000000LL) - 11644473600LL;
440
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
441
}
442

  
443
/**
444
 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
445
 */
446
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
447
{
448
    time_t t = (value / 10000000LL) - 719162LL*86400LL;
449
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
450
}
451

  
452
/**
453
 * Convert OLE DATE to ISO-8601 string
454
 */
455
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
456
{
457
    time_t t = 631112400LL + 86400*av_int2dbl(value);
458
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
459
}
460

  
461
static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
462
{
463
    char mime[1024];
464
    char description[1024];
465
    unsigned int filesize;
466
    AVStream *st;
467
    int64_t pos = url_ftell(pb);
468

  
469
    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
470
    if (strcmp(mime, "image/jpeg"))
471
        goto done;
472

  
473
    get_byte(pb);
474
    avio_get_str16le(pb, INT_MAX, description, sizeof(description));
475
    filesize = get_le32(pb);
476
    if (!filesize)
477
        goto done;
478

  
479
    st = av_new_stream(s, 0);
480
    if (!st)
481
        goto done;
482
    av_metadata_set2(&st->metadata, "title", description, 0);
483
    st->codec->codec_id   = CODEC_ID_MJPEG;
484
    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
485
    st->codec->extradata  = av_mallocz(filesize);
486
    if (!st->codec->extradata)
487
        goto done;
488
    st->codec->extradata_size = filesize;
489
    get_buffer(pb, st->codec->extradata, filesize);
490
done:
491
    url_fseek(pb, pos + length, SEEK_SET);
492
}
493

  
494
static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)
495
{
496
    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
497
    char *buf = av_malloc(buf_size);
498
    if (!buf)
499
        return;
500

  
501
    if (type == 0 && length == 4) {
502
        snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));
503
    } else if (type == 1) {
504
        avio_get_str16le(pb, length, buf, buf_size);
505
        if (!strlen(buf)) {
506
           av_free(buf);
507
           return;
508
        }
509
    } else if (type == 3 && length == 4) {
510
        strcpy(buf, get_le32(pb) ? "true" : "false");
511
    } else if (type == 4 && length == 8) {
512
        int64_t num = get_le64(pb);
513
        if (!strcmp(key, "WM/EncodingTime") ||
514
            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
515
            filetime_to_iso8601(buf, buf_size, num);
516
        else if (!strcmp(key, "WM/WMRVEncodeTime") ||
517
                 !strcmp(key, "WM/WMRVEndTime"))
518
            crazytime_to_iso8601(buf, buf_size, num);
519
        else if (!strcmp(key, "WM/WMRVExpirationDate"))
520
            oledate_to_iso8601(buf, buf_size, num);
521
        else if (!strcmp(key, "WM/WMRVBitrate"))
522
            snprintf(buf, buf_size, "%f", av_int2dbl(num));
523
        else
524
            snprintf(buf, buf_size, "%"PRIi64, num);
525
    } else if (type == 5 && length == 2) {
526
        snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
527
    } else if (type == 6 && length == 16) {
528
        ff_asf_guid guid;
529
        get_buffer(pb, guid, 16);
530
        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
531
    } else if (type == 2 && !strcmp(key, "WM/Picture")) {
532
        get_attachment(s, pb, length);
533
        av_freep(&buf);
534
        return;
535
    } else {
536
        av_freep(&buf);
537
        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
538
        url_fskip(pb, length);
539
        return;
540
    }
541

  
542
    av_metadata_set2(&s->metadata, key, buf, 0);
543
    av_freep(&buf);
544
}
545

  
546
/**
547
 * Parse metadata entries
548
 */
549
static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
550
{
551
    ff_asf_guid guid;
552
    int length, type;
553
    while(!url_feof(pb)) {
554
        char key[1024];
555
        ff_get_guid(pb, &guid);
556
        type   = get_le32(pb);
557
        length = get_le32(pb);
558
        if (!length)
559
            break;
560
        if (ff_guidcmp(&guid, metadata_guid)) {
561
            av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
562
                   "remaining metadata entries ignored\n", ARG_GUID(guid));
563
            break;
564
        }
565
        avio_get_str16le(pb, INT_MAX, key, sizeof(key));
566
        get_tag(s, pb, key, type, length);
567
    }
568

  
569
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
570
}
571

  
572
/**
162 573
 * parse VIDEOINFOHEADER2 structure
163 574
 * @return bytes consumed
164 575
 */
165 576
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
166 577
{
167
    ByteIOContext *pb = s->pb;
578
    WtvContext *wtv = s->priv_data;
579
    ByteIOContext *pb = wtv->pb;
168 580

  
169 581
    url_fskip(pb, 72);  // picture aspect ratio is unreliable
170 582
    ff_get_bmp_header(pb, st);
......
233 645
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
234 646
                                   ff_asf_guid formattype, int size)
235 647
{
236
    ByteIOContext *pb = s->pb;
648
    WtvContext *wtv = s->priv_data;
649
    ByteIOContext *pb = wtv->pb;
237 650
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
238 651
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
239 652
        ff_asf_guid actual_subtype;
......
339 752

  
340 753
enum {
341 754
    SEEK_TO_DATA = 0,
342
    SEEK_TO_BYTE,
343 755
    SEEK_TO_PTS,
344 756
};
345 757

  
346 758
/**
347 759
 * Parse WTV chunks
348
 * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
349
 * @param seekts either byte position or timestamp
760
 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
761
 * @param seekts timestamp
350 762
 * @param[out] len Length of data chunk
351 763
 * @return stream index of data chunk, or <0 on error
352 764
 */
353 765
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
354 766
{
355 767
    WtvContext *wtv = s->priv_data;
356
    ByteIOContext *pb = s->pb;
768
    ByteIOContext *pb = wtv->pb;
357 769
    while (!url_feof(pb)) {
358 770
        ff_asf_guid g;
359 771
        int len, sid, consumed;
360 772

  
361
        if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
362
            return 0;
363

  
364 773
        ff_get_guid(pb, &g);
365
        if (is_zero(g, sizeof(ff_asf_guid)))
366
            return AVERROR_EOF;
367

  
368 774
        len = get_le32(pb);
369 775
        if (len < 32)
370 776
            break;
......
458 864
                consumed += 16;
459 865
                if (wtv->pts == -1)
460 866
                    wtv->pts = AV_NOPTS_VALUE;
867
                else {
868
                    wtv->last_valid_pts = wtv->pts;
869
                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
870
                        wtv->epoch = wtv->pts;
461 871
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
462 872
#define WTV_PAD8(x) (((x) + 7) & ~7)
463 873
                    url_fskip(pb, WTV_PAD8(len) - consumed);
464 874
                    return 0;
465 875
                }
876
                }
466 877
            }
467 878
        } else if (!ff_guidcmp(g, data_guid)) {
468 879
            int stream_index = ff_find_stream_index(s, sid);
......
472 883
                if (len_ptr) {
473 884
                    *len_ptr = len;
474 885
                }
475
                if (wtv->pts != AV_NOPTS_VALUE)
476
                    av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
477 886
                return stream_index;
478 887
            }
479 888
        } else if (
......
505 914
    return AVERROR_EOF;
506 915
}
507 916

  
508
#define WTV_CHUNK_START 0x40000
917
/* declare utf16le strings */
918
#define _ , 0,
919
static const uint8_t timeline_le16[] =
920
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
921
static const uint8_t table_0_entries_legacy_attrib_le16[] =
922
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
923
static const uint8_t table_0_entries_time_le16[] =
924
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
925
static const uint8_t timeline_table_0_entries_Events_le16[] =
926
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
927
#undef _
509 928

  
510 929
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
511 930
{
512
    ByteIOContext *pb = s->pb;
931
    WtvContext *wtv = s->priv_data;
932
    int root_sector, root_size;
933
    uint8_t root[WTV_SECTOR_SIZE];
934
    ByteIOContext *pb;
935
    int64_t timeline_pos;
513 936
    int ret;
514 937

  
515
    url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
938
    wtv->epoch          =
939
    wtv->pts            =
940
    wtv->last_valid_pts = AV_NOPTS_VALUE;
941

  
942
    /* read root directory sector */
943
    url_fskip(s->pb, 0x30);
944
    root_size = get_le32(s->pb);
945
    if (root_size > sizeof(root)) {
946
        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
947
        return AVERROR_INVALIDDATA;
948
    }
949
    url_fskip(s->pb, 4);
950
    root_sector = get_le32(s->pb);
951

  
952
    url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
953
    root_size = get_buffer(s->pb, root, root_size);
954
    if (root_size < 0)
955
        return AVERROR_INVALIDDATA;
956

  
957
    /* parse chunks up until first data chunk */
958
    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
959
    if (!wtv->pb) {
960
        av_log(s, AV_LOG_ERROR, "timeline data missing\n");
961
        return AVERROR_INVALIDDATA;
962
    }
963

  
516 964
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
517 965
    if (ret < 0)
518 966
        return ret;
967
    url_fseek(wtv->pb, -32, SEEK_CUR);
968

  
969
    timeline_pos = url_ftell(s->pb); // save before opening another file
970

  
971
    /* read metadata */
972
    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
973
    if (pb) {
974
        parse_legacy_attrib(s, pb);
975
        wtvfile_close(pb);
976
    }
977

  
978
    /* read seek index */
979
    if (s->nb_streams) {
980
        AVStream *st = s->streams[0];
981
        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
982
        if (pb) {
983
            while(1) {
984
                uint64_t timestamp = get_le64(pb);
985
                uint64_t frame_nb  = get_le64(pb);
986
                if (url_feof(pb))
987
                    break;
988
                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
989
                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
990
            }
991
            wtvfile_close(pb);
519 992

  
520
    url_fseek(pb, -32, SEEK_CUR);
993
            if (wtv->nb_index_entries) {
994
                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
995
                if (pb) {
996
                    int i;
997
                    while (1) {
998
                        uint64_t frame_nb = get_le64(pb);
999
                        uint64_t position = get_le64(pb);
1000
                        if (url_feof(pb))
1001
                            break;
1002
                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1003
                            AVIndexEntry *e = wtv->index_entries + i;
1004
                            if (frame_nb > e->size)
1005
                                break;
1006
                            if (position > e->pos)
1007
                                e->pos = position;
1008
                        }
1009
                    }
1010
                    wtvfile_close(pb);
1011
                    st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1012
                }
1013
            }
1014
        }
1015
    }
1016

  
1017
    url_fseek(s->pb, timeline_pos, SEEK_SET);
521 1018
    return 0;
522 1019
}
523 1020

  
524 1021
static int read_packet(AVFormatContext *s, AVPacket *pkt)
525 1022
{
526 1023
    WtvContext *wtv = s->priv_data;
527
    ByteIOContext *pb = s->pb;
1024
    ByteIOContext *pb = wtv->pb;
528 1025
    int stream_index, len, ret;
529 1026

  
530 1027
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
......
540 1037
    return 0;
541 1038
}
542 1039

  
543
static int read_seek2(AVFormatContext *s, int stream_index,
544
                      int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
1040
static int read_seek(AVFormatContext *s, int stream_index,
1041
                     int64_t ts, int flags)
545 1042
{
546 1043
    WtvContext *wtv = s->priv_data;
547
    ByteIOContext *pb = s->pb;
548
    AVStream *st;
1044
    ByteIOContext *pb = wtv->pb;
1045
    AVStream *st = s->streams[0];
1046
    int64_t ts_relative;
549 1047
    int i;
550 1048

  
551
    if (stream_index < 0) {
552
        stream_index = av_find_default_stream_index(s);
553
        if (stream_index < 0)
554
            return -1;
555
    }
556
    st = s->streams[stream_index];
557

  
558
    if ((flags & AVSEEK_FLAG_FRAME)) {
1049
    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
559 1050
        return AVERROR_NOTSUPP;
560
    } else if ((flags & AVSEEK_FLAG_BYTE)) {
561
        if (ts < url_ftell(pb)) {
562
            for (i = st->nb_index_entries - 1; i >= 0; i--) {
563
                if (st->index_entries[i].pos <= ts) {
564
                    wtv->pts    = st->index_entries[i].timestamp;
565
                    url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
566
                    break;
567
                }
568
            }
569
            if (i < 0) {
570
                wtv->pts = 0;
571
                url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
572
            }
573
        }
574
        if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
1051

  
1052
    /* timestamp adjustment is required because wtv->pts values are absolute,
1053
     * whereas AVIndexEntry->timestamp values are relative to epoch. */
1054
    ts_relative = ts;
1055
    if (wtv->epoch != AV_NOPTS_VALUE)
1056
        ts_relative -= wtv->epoch;
1057

  
1058
    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1059
    if (i < 0) {
1060
        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1061
            url_fseek(pb, 0, SEEK_SET);
1062
        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1063
            url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1064
        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
575 1065
            return AVERROR(ERANGE);
576 1066
        return 0;
577
    } else {
578
        ts *= 10;
579
        i = av_index_search_timestamp(st, ts, flags);
580
        if (i < 0) {
581
            if (st->nb_index_entries > 0) {
582
                wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;
583
                url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
584
            } else {
585
                wtv->pts = 0;
586
                url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
587
            }
588
            if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
589
                return AVERROR(ERANGE);
590
            return 0;
591
        }
592
        wtv->pts    = st->index_entries[i].timestamp;
593
        url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
594
        return 0;
595 1067
    }
1068
    wtv->pts = wtv->index_entries[i].timestamp;
1069
    if (wtv->epoch != AV_NOPTS_VALUE)
1070
        wtv->pts += wtv->epoch;
1071
    wtv->last_valid_pts = wtv->pts;
1072
    url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
1073
    return 0;
1074
}
1075

  
1076
static int read_close(AVFormatContext *s)
1077
{
1078
    WtvContext *wtv = s->priv_data;
1079
    wtvfile_close(wtv->pb);
1080
    return 0;
596 1081
}
597 1082

  
598 1083
AVInputFormat ff_wtv_demuxer = {
......
602 1087
    .read_probe     = read_probe,
603 1088
    .read_header    = read_header,
604 1089
    .read_packet    = read_packet,
605
    .read_seek2     = read_seek2,
606
    .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1090
    .read_seek      = read_seek,
1091
    .read_close     = read_close,
1092
    .flags          = AVFMT_SHOW_IDS,
607 1093
};

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