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ffmpeg / libavformat / wtvdec.c @ 8acab7ae

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1
/*
2
 * Windows Television (WTV) demuxer
3
 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file
24
 * Windows Television (WTV) demuxer
25
 * @author Peter Ross <pross@xvid.org>
26
 */
27

    
28
#include "libavutil/intreadwrite.h"
29
#include "libavutil/intfloat_readwrite.h"
30
#include "avformat.h"
31
#include "internal.h"
32
#include "wtv.h"
33
#include "mpegts.h"
34
#include <strings.h>
35

    
36
/* Macros for formating GUIDs */
37
#define PRI_PRETTY_GUID \
38
    "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
39
#define ARG_PRETTY_GUID(g) \
40
    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]
41
#define LEN_PRETTY_GUID 34
42

    
43
/*
44
 *
45
 * File system routines
46
 *
47
 */
48

    
49
typedef struct {
50
    AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
51

    
52
    int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
53
    uint32_t *sectors;   /** file allocation table */
54
    int nb_sectors;      /** number of sectors */
55

    
56
    int error;
57
    int64_t position;
58
    int64_t length;
59
} WtvFile;
60

    
61
/**
62
 * @return bytes read, 0 on end of file, or <0 on error
63
 */
64
static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
65
{
66
    WtvFile *wf = opaque;
67
    AVIOContext *pb = wf->pb_filesystem;
68
    int nread = 0;
69

    
70
    if (wf->error || pb->error)
71
        return -1;
72
    if (wf->position >= wf->length || url_feof(pb))
73
        return 0;
74

    
75
    buf_size = FFMIN(buf_size, wf->length - wf->position);
76
    while(nread < buf_size) {
77
        int n;
78
        int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
79
        int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
80

    
81
        n = avio_read(pb, buf, read_request);
82
        if (n <= 0)
83
            break;
84
        nread += n;
85
        buf += n;
86
        wf->position += n;
87
        if (n == remaining_in_sector) {
88
            int i = wf->position >> wf->sector_bits;
89
            if (i >= wf->nb_sectors ||
90
                (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
91
                avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
92
                wf->error = 1;
93
                break;
94
            }
95
        }
96
    }
97
    return nread;
98
}
99

    
100
/**
101
 * @return position (or file length)
102
 */
103
static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
104
{
105
    WtvFile *wf = opaque;
106
    AVIOContext *pb = wf->pb_filesystem;
107

    
108
    if (whence == AVSEEK_SIZE)
109
        return wf->length;
110
    else if (whence == SEEK_CUR)
111
        offset = wf->position + offset;
112
    else if (whence == SEEK_END)
113
        offset = wf->length;
114

    
115
    wf->error = offset < 0 || offset >= wf->length ||
116
                avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
117
                              + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
118
    wf->position = offset;
119
    return offset;
120
}
121

    
122
/**
123
 * read non-zero integers (le32) from input stream
124
 * @param pb
125
 * @param[out] data destination
126
 * @param     count maximum number of integers to read
127
 * @return    total number of integers read
128
 */
129
static int read_ints(AVIOContext *pb, uint32_t *data, int count)
130
{
131
    int i, total = 0;
132
    for (i = 0; i < count; i++) {
133
        if ((data[total] = avio_rl32(pb)))
134
           total++;
135
    }
136
    return total;
137
}
138

    
139
/**
140
 * Open file
141
 * @param first_sector  First sector
142
 * @param length        Length of file (bytes)
143
 * @param depth         File allocation table depth
144
 * @return NULL on error
145
 */
146
static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
147
{
148
    AVIOContext *pb;
149
    WtvFile *wf;
150
    uint8_t *buffer;
151

    
152
    if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
153
        return NULL;
154

    
155
    wf = av_mallocz(sizeof(WtvFile));
156
    if (!wf)
157
        return NULL;
158

    
159
    if (depth == 0) {
160
        wf->sectors = av_malloc(sizeof(uint32_t));
161
        if (!wf->sectors) {
162
            av_free(wf);
163
            return NULL;
164
        }
165
        wf->sectors[0]  = first_sector;
166
        wf->nb_sectors  = 1;
167
        wf->sector_bits = WTV_SECTOR_BITS;
168
    } else if (depth == 1) {
169
        wf->sectors = av_malloc(WTV_SECTOR_SIZE);
170
        if (!wf->sectors) {
171
            av_free(wf);
172
            return NULL;
173
        }
174
        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
175
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
176
    } else if (depth == 2) {
177
        uint32_t sectors1[WTV_SECTOR_SIZE / 4];
178
        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
179
        int i;
180

    
181
        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
182
        if (!wf->sectors) {
183
            av_free(wf);
184
            return NULL;
185
        }
186
        wf->nb_sectors = 0;
187
        for (i = 0; i < nb_sectors1; i++) {
188
            if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
189
                break;
190
            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
191
        }
192
        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
193
    } else {
194
        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
195
        av_free(wf);
196
        return NULL;
197
    }
198

    
199
    if (!wf->nb_sectors) {
200
        av_free(wf->sectors);
201
        av_free(wf);
202
        return NULL;
203
    }
204

    
205
    /* check length */
206
    length &= 0xFFFFFFFFFFFF;
207
    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
208
        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);
209
        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
210
    }
211
    wf->length = length;
212

    
213
    /* seek to intial sector */
214
    wf->position = 0;
215
    if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
216
        av_free(wf->sectors);
217
        av_free(wf);
218
        return NULL;
219
    }
220

    
221
    wf->pb_filesystem = s->pb;
222
    buffer = av_malloc(1 << wf->sector_bits);
223
    if (!buffer) {
224
        av_free(wf->sectors);
225
        av_free(wf);
226
        return NULL;
227
    }
228

    
229
    pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
230
                           wtvfile_read_packet, NULL, wtvfile_seek);
231
    if (!pb) {
232
        av_free(buffer);
233
        av_free(wf->sectors);
234
        av_free(wf);
235
    }
236
    return pb;
237
}
238

    
239
/**
240
 * Open file using filename
241
 * @param[in]  buf       directory buffer
242
 * @param      buf_size  directory buffer size
243
 * @param[in]  filename
244
 * @param      filename_size size of filename
245
 * @return NULL on error
246
 */
247
static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
248
{
249
    const uint8_t *buf_end = buf + buf_size;
250

    
251
    while(buf + 48 <= buf_end) {
252
        int dir_length, name_size, first_sector, depth;
253
        uint64_t file_length;
254
        const uint8_t *name;
255
        if (ff_guidcmp(buf, ff_dir_entry_guid)) {
256
            av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
257
                   "remaining directory entries ignored\n", FF_ARG_GUID(buf));
258
            break;
259
        }
260
        dir_length  = AV_RL16(buf + 16);
261
        file_length = AV_RL64(buf + 24);
262
        name_size   = 2 * AV_RL32(buf + 32);
263
        if (buf + 48 + name_size > buf_end) {
264
            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
265
            break;
266
        }
267
        first_sector = AV_RL32(buf + 40 + name_size);
268
        depth        = AV_RL32(buf + 44 + name_size);
269

    
270
        /* compare file name; test optional null terminator */
271
        name = buf + 40;
272
        if (name_size >= filename_size &&
273
            !memcmp(name, filename, filename_size) &&
274
            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
275
            return wtvfile_open_sector(first_sector, file_length, depth, s);
276

    
277
        buf += dir_length;
278
    }
279
    return 0;
280
}
281

    
282
#define wtvfile_open(s, buf, buf_size, filename) \
283
    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
284

    
285
/**
286
 * Close file opened with wtvfile_open_sector(), or wtv_open()
287
 */
288
static void wtvfile_close(AVIOContext *pb)
289
{
290
    WtvFile *wf = pb->opaque;
291
    av_free(wf->sectors);
292
    av_free(pb);
293
}
294

    
295
/*
296
 *
297
 * Main demuxer
298
 *
299
 */
300

    
301
typedef struct {
302
    int seen_data;
303
} WtvStream;
304

    
305
typedef struct {
306
    AVIOContext *pb;       /** timeline file */
307
    int64_t epoch;
308
    int64_t pts;             /** pts for next data chunk */
309
    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
310

    
311
    /* maintain private seek index, as the AVIndexEntry->pos is relative to the
312
       start of the 'timeline' file, not the file system (AVFormatContext->pb) */
313
    AVIndexEntry *index_entries;
314
    int nb_index_entries;
315
    unsigned int index_entries_allocated_size;
316
} WtvContext;
317

    
318
/* WTV GUIDs */
319
static const ff_asf_guid metadata_guid =
320
    {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
321
static const ff_asf_guid stream2_guid =
322
    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
323
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
324
    {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
325
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
326
    {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
327
static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
328
    {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
329
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
330
    {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
331
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
332
    {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
333
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
334
    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
335
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
336
    {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
337
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
338
    {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
339
static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
340
    {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
341

    
342
/* Windows media GUIDs */
343

    
344
/* Media types */
345
static const ff_asf_guid mediasubtype_mpeg1payload =
346
    {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
347
static const ff_asf_guid mediatype_mpeg2_sections =
348
    {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
349
static const ff_asf_guid mediatype_mpeg2_pes =
350
    {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
351
static const ff_asf_guid mediatype_mstvcaption =
352
    {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
353

    
354
/* Media subtypes */
355
static const ff_asf_guid mediasubtype_cpfilters_processed =
356
    {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
357
static const ff_asf_guid mediasubtype_dvb_subtitle =
358
    {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
359
static const ff_asf_guid mediasubtype_teletext =
360
    {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
361
static const ff_asf_guid mediasubtype_dtvccdata =
362
    {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
363
static const ff_asf_guid mediasubtype_mpeg2_sections =
364
    {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
365

    
366
/* Formats */
367
static const ff_asf_guid format_cpfilters_processed =
368
    {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
369
static const ff_asf_guid format_waveformatex =
370
    {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
371
static const ff_asf_guid format_videoinfo2 =
372
    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
373
static const ff_asf_guid format_mpeg2_video =
374
    {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
375

    
376
static int read_probe(AVProbeData *p)
377
{
378
    return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
379
}
380

    
381
/**
382
 * Convert win32 FILETIME to ISO-8601 string
383
 */
384
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
385
{
386
    time_t t = (value / 10000000LL) - 11644473600LL;
387
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
388
}
389

    
390
/**
391
 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
392
 */
393
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
394
{
395
    time_t t = (value / 10000000LL) - 719162LL*86400LL;
396
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
397
}
398

    
399
/**
400
 * Convert OLE DATE to ISO-8601 string
401
 * @return <0 on error
402
 */
403
static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
404
{
405
    time_t t = 631112400LL + 86400*av_int2dbl(value);
406
    struct tm result;
407
    if (!gmtime_r(&t, &result))
408
        return -1;
409
    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", &result);
410
    return 0;
411
}
412

    
413
static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
414
{
415
    char mime[1024];
416
    char description[1024];
417
    unsigned int filesize;
418
    AVStream *st;
419
    int64_t pos = avio_tell(pb);
420

    
421
    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
422
    if (strcmp(mime, "image/jpeg"))
423
        goto done;
424

    
425
    avio_r8(pb);
426
    avio_get_str16le(pb, INT_MAX, description, sizeof(description));
427
    filesize = avio_rl32(pb);
428
    if (!filesize)
429
        goto done;
430

    
431
    st = av_new_stream(s, 0);
432
    if (!st)
433
        goto done;
434
    av_metadata_set2(&st->metadata, "title", description, 0);
435
    st->codec->codec_id   = CODEC_ID_MJPEG;
436
    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
437
    st->codec->extradata  = av_mallocz(filesize);
438
    if (!st->codec->extradata)
439
        goto done;
440
    st->codec->extradata_size = filesize;
441
    avio_read(pb, st->codec->extradata, filesize);
442
done:
443
    avio_seek(pb, pos + length, SEEK_SET);
444
}
445

    
446
static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
447
{
448
    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
449
    char *buf = av_malloc(buf_size);
450
    if (!buf)
451
        return;
452

    
453
    if (type == 0 && length == 4) {
454
        snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
455
    } else if (type == 1) {
456
        avio_get_str16le(pb, length, buf, buf_size);
457
        if (!strlen(buf)) {
458
           av_free(buf);
459
           return;
460
        }
461
    } else if (type == 3 && length == 4) {
462
        strcpy(buf, avio_rl32(pb) ? "true" : "false");
463
    } else if (type == 4 && length == 8) {
464
        int64_t num = avio_rl64(pb);
465
        if (!strcmp(key, "WM/EncodingTime") ||
466
            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
467
            filetime_to_iso8601(buf, buf_size, num);
468
        else if (!strcmp(key, "WM/WMRVEncodeTime") ||
469
                 !strcmp(key, "WM/WMRVEndTime"))
470
            crazytime_to_iso8601(buf, buf_size, num);
471
        else if (!strcmp(key, "WM/WMRVExpirationDate")) {
472
            if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
473
                av_free(buf);
474
                return;
475
            }
476
        } else if (!strcmp(key, "WM/WMRVBitrate"))
477
            snprintf(buf, buf_size, "%f", av_int2dbl(num));
478
        else
479
            snprintf(buf, buf_size, "%"PRIi64, num);
480
    } else if (type == 5 && length == 2) {
481
        snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
482
    } else if (type == 6 && length == 16) {
483
        ff_asf_guid guid;
484
        avio_read(pb, guid, 16);
485
        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
486
    } else if (type == 2 && !strcmp(key, "WM/Picture")) {
487
        get_attachment(s, pb, length);
488
        av_freep(&buf);
489
        return;
490
    } else {
491
        av_freep(&buf);
492
        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
493
        avio_skip(pb, length);
494
        return;
495
    }
496

    
497
    av_metadata_set2(&s->metadata, key, buf, 0);
498
    av_freep(&buf);
499
}
500

    
501
/**
502
 * Parse metadata entries
503
 */
504
static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
505
{
506
    ff_asf_guid guid;
507
    int length, type;
508
    while(!url_feof(pb)) {
509
        char key[1024];
510
        ff_get_guid(pb, &guid);
511
        type   = avio_rl32(pb);
512
        length = avio_rl32(pb);
513
        if (!length)
514
            break;
515
        if (ff_guidcmp(&guid, metadata_guid)) {
516
            av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
517
                   "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
518
            break;
519
        }
520
        avio_get_str16le(pb, INT_MAX, key, sizeof(key));
521
        get_tag(s, pb, key, type, length);
522
    }
523

    
524
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
525
}
526

    
527
/**
528
 * parse VIDEOINFOHEADER2 structure
529
 * @return bytes consumed
530
 */
531
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
532
{
533
    WtvContext *wtv = s->priv_data;
534
    AVIOContext *pb = wtv->pb;
535

    
536
    avio_skip(pb, 72);  // picture aspect ratio is unreliable
537
    ff_get_bmp_header(pb, st);
538

    
539
    return 72 + 40;
540
}
541

    
542
/**
543
 * Parse MPEG1WAVEFORMATEX extradata structure
544
 */
545
static void parse_mpeg1waveformatex(AVStream *st)
546
{
547
    /* fwHeadLayer */
548
    switch (AV_RL16(st->codec->extradata)) {
549
    case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
550
    case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
551
    case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
552
    }
553

    
554
    st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
555

    
556
    /* dwHeadMode */
557
    switch (AV_RL16(st->codec->extradata + 6)) {
558
    case 1 : case 2 : case 4 : st->codec->channels = 2; break;
559
    case 8 :                   st->codec->channels = 1; break;
560
    }
561
}
562

    
563
/**
564
 * Initialise stream
565
 * @param st Stream to initialise, or NULL to create and initialise new stream
566
 * @return NULL on error
567
 */
568
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
569
{
570
    if (st) {
571
        if (st->codec->extradata) {
572
            av_freep(&st->codec->extradata);
573
            st->codec->extradata_size = 0;
574
        }
575
    } else {
576
        WtvStream *wst = av_mallocz(sizeof(WtvStream));
577
        if (!wst)
578
            return NULL;
579
        st = av_new_stream(s, sid);
580
        if (!st)
581
            return NULL;
582
        st->priv_data = wst;
583
    }
584
    st->codec->codec_type = codec_type;
585
    st->need_parsing      = AVSTREAM_PARSE_FULL;
586
    av_set_pts_info(st, 64, 1, 10000000);
587
    return st;
588
}
589

    
590
/**
591
 * parse Media Type structure and populate stream
592
 * @param st         Stream, or NULL to create new stream
593
 * @param mediatype  Mediatype GUID
594
 * @param subtype    Subtype GUID
595
 * @param formattype Format GUID
596
 * @param size       Size of format buffer
597
 * @return NULL on error
598
 */
599
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
600
                                   ff_asf_guid mediatype, ff_asf_guid subtype,
601
                                   ff_asf_guid formattype, int size)
602
{
603
    WtvContext *wtv = s->priv_data;
604
    AVIOContext *pb = wtv->pb;
605
    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
606
        !ff_guidcmp(formattype, format_cpfilters_processed)) {
607
        ff_asf_guid actual_subtype;
608
        ff_asf_guid actual_formattype;
609

    
610
        if (size < 32) {
611
            av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
612
            avio_skip(pb, size);
613
            return NULL;
614
        }
615

    
616
        avio_skip(pb, size - 32);
617
        ff_get_guid(pb, &actual_subtype);
618
        ff_get_guid(pb, &actual_formattype);
619
        avio_seek(pb, -size, SEEK_CUR);
620

    
621
        st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
622
        avio_skip(pb, 32);
623
        return st;
624
    } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
625
        st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
626
        if (!st)
627
            return NULL;
628
        if (!ff_guidcmp(formattype, format_waveformatex)) {
629
            int ret = ff_get_wav_header(pb, st->codec, size);
630
            if (ret < 0)
631
                return NULL;
632
        } else {
633
            if (ff_guidcmp(formattype, ff_format_none))
634
                av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
635
            avio_skip(pb, size);
636
        }
637

    
638
        if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
639
            st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
640
        } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
641
            if (st->codec->extradata && st->codec->extradata_size >= 22)
642
                parse_mpeg1waveformatex(st);
643
            else
644
                av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
645
        } else {
646
            st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
647
            if (st->codec->codec_id == CODEC_ID_NONE)
648
                av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
649
        }
650
        return st;
651
    } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
652
        st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
653
        if (!st)
654
            return NULL;
655
        if (!ff_guidcmp(formattype, format_videoinfo2)) {
656
            int consumed = parse_videoinfoheader2(s, st);
657
            avio_skip(pb, FFMAX(size - consumed, 0));
658
        } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
659
            int consumed = parse_videoinfoheader2(s, st);
660
            avio_skip(pb, FFMAX(size - consumed, 0));
661
        } else {
662
            if (ff_guidcmp(formattype, ff_format_none))
663
                av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
664
            avio_skip(pb, size);
665
        }
666

    
667
        if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
668
            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
669
        } else {
670
            st->codec->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
671
        }
672
        if (st->codec->codec_id == CODEC_ID_NONE)
673
            av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
674
        return st;
675
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
676
               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
677
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
678
        if (!st)
679
            return NULL;
680
        if (ff_guidcmp(formattype, ff_format_none))
681
            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
682
        avio_skip(pb, size);
683
        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
684
        return st;
685
    } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
686
               (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
687
        st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
688
        if (!st)
689
            return NULL;
690
        if (ff_guidcmp(formattype, ff_format_none))
691
            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
692
        avio_skip(pb, size);
693
        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
694
        return st;
695
    } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
696
               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
697
        if (ff_guidcmp(formattype, ff_format_none))
698
            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
699
        avio_skip(pb, size);
700
        return NULL;
701
    }
702

    
703
    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
704
                              ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
705
                              FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
706
    avio_skip(pb, size);
707
    return NULL;
708
}
709

    
710
enum {
711
    SEEK_TO_DATA = 0,
712
    SEEK_TO_PTS,
713
};
714

    
715
/**
716
 * Parse WTV chunks
717
 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
718
 * @param seekts timestamp
719
 * @param[out] len Length of data chunk
720
 * @return stream index of data chunk, or <0 on error
721
 */
722
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
723
{
724
    WtvContext *wtv = s->priv_data;
725
    AVIOContext *pb = wtv->pb;
726
    while (!url_feof(pb)) {
727
        ff_asf_guid g;
728
        int len, sid, consumed;
729

    
730
        ff_get_guid(pb, &g);
731
        len = avio_rl32(pb);
732
        if (len < 32)
733
            break;
734
        sid = avio_rl32(pb) & 0x7FFF;
735
        avio_skip(pb, 8);
736
        consumed = 32;
737

    
738
        if (!ff_guidcmp(g, ff_stream_guid)) {
739
            if (ff_find_stream_index(s, sid) < 0) {
740
                ff_asf_guid mediatype, subtype, formattype;
741
                int size;
742
                avio_skip(pb, 28);
743
                ff_get_guid(pb, &mediatype);
744
                ff_get_guid(pb, &subtype);
745
                avio_skip(pb, 12);
746
                ff_get_guid(pb, &formattype);
747
                size = avio_rl32(pb);
748
                parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
749
                consumed += 92 + size;
750
            }
751
        } else if (!ff_guidcmp(g, stream2_guid)) {
752
            int stream_index = ff_find_stream_index(s, sid);
753
            if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
754
                ff_asf_guid mediatype, subtype, formattype;
755
                int size;
756
                avio_skip(pb, 12);
757
                ff_get_guid(pb, &mediatype);
758
                ff_get_guid(pb, &subtype);
759
                avio_skip(pb, 12);
760
                ff_get_guid(pb, &formattype);
761
                size = avio_rl32(pb);
762
                parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
763
                consumed += 76 + size;
764
            }
765
        } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
766
                   !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
767
                   !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
768
                   !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
769
                   !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
770
                   !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
771
            int stream_index = ff_find_stream_index(s, sid);
772
            if (stream_index >= 0) {
773
                AVStream *st = s->streams[stream_index];
774
                uint8_t buf[258];
775
                const uint8_t *pbuf = buf;
776
                int buf_size;
777

    
778
                avio_skip(pb, 8);
779
                consumed += 8;
780
                if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
781
                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
782
                    avio_skip(pb, 6);
783
                    consumed += 6;
784
                }
785

    
786
                buf_size = FFMIN(len - consumed, sizeof(buf));
787
                avio_read(pb, buf, buf_size);
788
                consumed += buf_size;
789
                ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
790
            }
791
        } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
792
            int stream_index = ff_find_stream_index(s, sid);
793
            if (stream_index >= 0) {
794
                AVStream *st = s->streams[stream_index];
795
                int audio_type;
796
                avio_skip(pb, 8);
797
                audio_type = avio_r8(pb);
798
                if (audio_type == 2)
799
                    st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
800
                else if (audio_type == 3)
801
                    st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
802
                consumed += 9;
803
            }
804
        } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
805
            int stream_index = ff_find_stream_index(s, sid);
806
            if (stream_index >= 0) {
807
                avio_skip(pb, 12);
808
                if (avio_rl32(pb))
809
                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
810
                consumed += 16;
811
            }
812
        } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
813
            int stream_index = ff_find_stream_index(s, sid);
814
            if (stream_index >= 0) {
815
                AVStream *st = s->streams[stream_index];
816
                uint8_t language[4];
817
                avio_skip(pb, 12);
818
                avio_read(pb, language, 3);
819
                if (language[0]) {
820
                    language[3] = 0;
821
                    av_metadata_set2(&st->metadata, "language", language, 0);
822
                    if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
823
                        st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
824
                }
825
                consumed += 15;
826
            }
827
        } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
828
            int stream_index = ff_find_stream_index(s, sid);
829
            if (stream_index >= 0) {
830
                avio_skip(pb, 8);
831
                wtv->pts = avio_rl64(pb);
832
                consumed += 16;
833
                if (wtv->pts == -1)
834
                    wtv->pts = AV_NOPTS_VALUE;
835
                else {
836
                    wtv->last_valid_pts = wtv->pts;
837
                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
838
                        wtv->epoch = wtv->pts;
839
                if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
840
#define WTV_PAD8(x) (((x) + 7) & ~7)
841
                    avio_skip(pb, WTV_PAD8(len) - consumed);
842
                    return 0;
843
                }
844
                }
845
            }
846
        } else if (!ff_guidcmp(g, ff_data_guid)) {
847
            int stream_index = ff_find_stream_index(s, sid);
848
            if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
849
                WtvStream *wst = s->streams[stream_index]->priv_data;
850
                wst->seen_data = 1;
851
                if (len_ptr) {
852
                    *len_ptr = len;
853
                }
854
                return stream_index;
855
            }
856
        } else if (
857
            !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||
858
            !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||
859
            !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ (const ff_asf_guid){0x12,0xF6,0x22,0xB6,0xAD,0x47,0x71,0x46,0xAD,0x6C,0x05,0xA9,0x8E,0x65,0xDE,0x3A}) ||
860
            !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||
861
            !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||
862
            !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||
863
            !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||
864
            !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||
865
            !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||
866
            !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||
867
            !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
868
            !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
869
            !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
870
            !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
871
            !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
872
            !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
873
            !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
874
            !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
875
            //ignore known guids
876
        } else
877
            av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
878

    
879
        avio_skip(pb, WTV_PAD8(len) - consumed);
880
    }
881
    return AVERROR_EOF;
882
}
883

    
884
/* declare utf16le strings */
885
#define _ , 0,
886
static const uint8_t timeline_le16[] =
887
    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
888
static const uint8_t table_0_entries_legacy_attrib_le16[] =
889
    {'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};
890
static const uint8_t table_0_entries_time_le16[] =
891
    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
892
static const uint8_t timeline_table_0_entries_Events_le16[] =
893
    {'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};
894
#undef _
895

    
896
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
897
{
898
    WtvContext *wtv = s->priv_data;
899
    int root_sector, root_size;
900
    uint8_t root[WTV_SECTOR_SIZE];
901
    AVIOContext *pb;
902
    int64_t timeline_pos;
903
    int ret;
904

    
905
    wtv->epoch          =
906
    wtv->pts            =
907
    wtv->last_valid_pts = AV_NOPTS_VALUE;
908

    
909
    /* read root directory sector */
910
    avio_skip(s->pb, 0x30);
911
    root_size = avio_rl32(s->pb);
912
    if (root_size > sizeof(root)) {
913
        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
914
        return AVERROR_INVALIDDATA;
915
    }
916
    avio_skip(s->pb, 4);
917
    root_sector = avio_rl32(s->pb);
918

    
919
    avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
920
    root_size = avio_read(s->pb, root, root_size);
921
    if (root_size < 0)
922
        return AVERROR_INVALIDDATA;
923

    
924
    /* parse chunks up until first data chunk */
925
    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
926
    if (!wtv->pb) {
927
        av_log(s, AV_LOG_ERROR, "timeline data missing\n");
928
        return AVERROR_INVALIDDATA;
929
    }
930

    
931
    ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
932
    if (ret < 0)
933
        return ret;
934
    avio_seek(wtv->pb, -32, SEEK_CUR);
935

    
936
    timeline_pos = avio_tell(s->pb); // save before opening another file
937

    
938
    /* read metadata */
939
    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
940
    if (pb) {
941
        parse_legacy_attrib(s, pb);
942
        wtvfile_close(pb);
943
    }
944

    
945
    /* read seek index */
946
    if (s->nb_streams) {
947
        AVStream *st = s->streams[0];
948
        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
949
        if (pb) {
950
            while(1) {
951
                uint64_t timestamp = avio_rl64(pb);
952
                uint64_t frame_nb  = avio_rl64(pb);
953
                if (url_feof(pb))
954
                    break;
955
                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
956
                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
957
            }
958
            wtvfile_close(pb);
959

    
960
            if (wtv->nb_index_entries) {
961
                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
962
                if (pb) {
963
                    int i;
964
                    while (1) {
965
                        uint64_t frame_nb = avio_rl64(pb);
966
                        uint64_t position = avio_rl64(pb);
967
                        if (url_feof(pb))
968
                            break;
969
                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
970
                            AVIndexEntry *e = wtv->index_entries + i;
971
                            if (frame_nb > e->size)
972
                                break;
973
                            if (position > e->pos)
974
                                e->pos = position;
975
                        }
976
                    }
977
                    wtvfile_close(pb);
978
                    st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
979
                }
980
            }
981
        }
982
    }
983

    
984
    avio_seek(s->pb, timeline_pos, SEEK_SET);
985
    return 0;
986
}
987

    
988
static int read_packet(AVFormatContext *s, AVPacket *pkt)
989
{
990
    WtvContext *wtv = s->priv_data;
991
    AVIOContext *pb = wtv->pb;
992
    int stream_index, len, ret;
993

    
994
    stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
995
    if (stream_index < 0)
996
        return stream_index;
997

    
998
    ret = av_get_packet(pb, pkt, len - 32);
999
    if (ret < 0)
1000
        return ret;
1001
    pkt->stream_index = stream_index;
1002
    pkt->pts          = wtv->pts;
1003
    avio_skip(pb, WTV_PAD8(len) - len);
1004
    return 0;
1005
}
1006

    
1007
static int read_seek(AVFormatContext *s, int stream_index,
1008
                     int64_t ts, int flags)
1009
{
1010
    WtvContext *wtv = s->priv_data;
1011
    AVIOContext *pb = wtv->pb;
1012
    AVStream *st = s->streams[0];
1013
    int64_t ts_relative;
1014
    int i;
1015

    
1016
    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1017
        return AVERROR(ENOSYS);
1018

    
1019
    /* timestamp adjustment is required because wtv->pts values are absolute,
1020
     * whereas AVIndexEntry->timestamp values are relative to epoch. */
1021
    ts_relative = ts;
1022
    if (wtv->epoch != AV_NOPTS_VALUE)
1023
        ts_relative -= wtv->epoch;
1024

    
1025
    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1026
    if (i < 0) {
1027
        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1028
            avio_seek(pb, 0, SEEK_SET);
1029
        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1030
            avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1031
        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1032
            return AVERROR(ERANGE);
1033
        return 0;
1034
    }
1035
    wtv->pts = wtv->index_entries[i].timestamp;
1036
    if (wtv->epoch != AV_NOPTS_VALUE)
1037
        wtv->pts += wtv->epoch;
1038
    wtv->last_valid_pts = wtv->pts;
1039
    avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1040
    return 0;
1041
}
1042

    
1043
static int read_close(AVFormatContext *s)
1044
{
1045
    WtvContext *wtv = s->priv_data;
1046
    wtvfile_close(wtv->pb);
1047
    return 0;
1048
}
1049

    
1050
AVInputFormat ff_wtv_demuxer = {
1051
    .name           = "wtv",
1052
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1053
    .priv_data_size = sizeof(WtvContext),
1054
    .read_probe     = read_probe,
1055
    .read_header    = read_header,
1056
    .read_packet    = read_packet,
1057
    .read_seek      = read_seek,
1058
    .read_close     = read_close,
1059
    .flags          = AVFMT_SHOW_IDS,
1060
};