50997398a56cd7b89c605f68ba0e257db14fae0d
[ffmpeg.git] / libavformat / wtv.c
1 /*
2  * Windows Television (WTV) demuxer
3  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * 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/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/intfloat.h"
31 #include "libavutil/dict.h"
32 #include "avformat.h"
33 #include "internal.h"
34 #include "riff.h"
35 #include "asf.h"
36 #include "mpegts.h"
37
38 /* Macros for formating GUIDs */
39 #define PRI_PRETTY_GUID \
40     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
41 #define ARG_PRETTY_GUID(g) \
42     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]
43 #define LEN_PRETTY_GUID 34
44
45 /*
46  *
47  * File system routines
48  *
49  */
50
51 #define WTV_SECTOR_BITS    INT64_C(12)
52 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
53 #define WTV_BIGSECTOR_BITS 18
54
55 typedef struct {
56     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
57
58     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
59     uint32_t *sectors;   /** file allocation table */
60     int nb_sectors;      /** number of sectors */
61
62     int error;
63     int64_t position;
64     int64_t length;
65 } WtvFile;
66
67 /**
68  * @return bytes read, 0 on end of file, or <0 on error
69  */
70 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
71 {
72     WtvFile *wf = opaque;
73     AVIOContext *pb = wf->pb_filesystem;
74     int nread = 0;
75
76     if (wf->error || pb->error)
77         return -1;
78     if (wf->position >= wf->length || pb->eof_reached)
79         return 0;
80
81     buf_size = FFMIN(buf_size, wf->length - wf->position);
82     while(nread < buf_size) {
83         int n;
84         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
85         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
86
87         n = avio_read(pb, buf, read_request);
88         if (n <= 0)
89             break;
90         nread += n;
91         buf += n;
92         wf->position += n;
93         if (n == remaining_in_sector) {
94             int i = wf->position >> wf->sector_bits;
95             if (i >= wf->nb_sectors ||
96                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
97                 avio_seek(pb, wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
98                 wf->error = 1;
99                 break;
100             }
101         }
102     }
103     return nread;
104 }
105
106 /**
107  * @return position (or file length)
108  */
109 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
110 {
111     WtvFile *wf = opaque;
112     AVIOContext *pb = wf->pb_filesystem;
113
114     if (whence == AVSEEK_SIZE)
115         return wf->length;
116     else if (whence == SEEK_CUR)
117         offset = wf->position + offset;
118     else if (whence == SEEK_END)
119         offset = wf->length;
120
121     wf->error = offset < 0 || offset >= wf->length ||
122                 avio_seek(pb, (wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
123                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
124     wf->position = offset;
125     return offset;
126 }
127
128 /**
129  * read non-zero integers (le32) from input stream
130  * @param pb
131  * @param[out] data destination
132  * @param     count maximum number of integers to read
133  * @return    total number of integers read
134  */
135 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
136 {
137     int i, total = 0;
138     for (i = 0; i < count; i++) {
139         if ((data[total] = avio_rl32(pb)))
140            total++;
141     }
142     return total;
143 }
144
145 /**
146  * Open file
147  * @param first_sector  First sector
148  * @param length        Length of file (bytes)
149  * @param depth         File allocation table depth
150  * @return NULL on error
151  */
152 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
153 {
154     AVIOContext *pb;
155     WtvFile *wf;
156     uint8_t *buffer;
157
158     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
159         return NULL;
160
161     wf = av_mallocz(sizeof(WtvFile));
162     if (!wf)
163         return NULL;
164
165     if (depth == 0) {
166         wf->sectors = av_malloc(sizeof(uint32_t));
167         if (!wf->sectors) {
168             av_free(wf);
169             return NULL;
170         }
171         wf->sectors[0]  = first_sector;
172         wf->nb_sectors  = 1;
173         wf->sector_bits = WTV_SECTOR_BITS;
174     } else if (depth == 1) {
175         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
176         if (!wf->sectors) {
177             av_free(wf);
178             return NULL;
179         }
180         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
181         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
182     } else if (depth == 2) {
183         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
184         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
185         int i;
186
187         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
188         if (!wf->sectors) {
189             av_free(wf);
190             return NULL;
191         }
192         wf->nb_sectors = 0;
193         for (i = 0; i < nb_sectors1; i++) {
194             if (avio_seek(s->pb, sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
195                 break;
196             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
197         }
198         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
199     } else {
200         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
201         av_free(wf);
202         return NULL;
203     }
204
205     if (!wf->nb_sectors) {
206         av_free(wf->sectors);
207         av_free(wf);
208         return NULL;
209     }
210
211     /* check length */
212     length &= 0xFFFFFFFFFFFF;
213     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
214         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);
215         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
216     }
217     wf->length = length;
218
219     /* seek to initial sector */
220     wf->position = 0;
221     if (avio_seek(s->pb, wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
222         av_free(wf->sectors);
223         av_free(wf);
224         return NULL;
225     }
226
227     wf->pb_filesystem = s->pb;
228     buffer = av_malloc(1 << wf->sector_bits);
229     if (!buffer) {
230         av_free(wf->sectors);
231         av_free(wf);
232         return NULL;
233     }
234
235     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
236                            wtvfile_read_packet, NULL, wtvfile_seek);
237     if (!pb) {
238         av_free(buffer);
239         av_free(wf->sectors);
240         av_free(wf);
241     }
242     return pb;
243 }
244
245 static const ff_asf_guid dir_entry_guid =
246     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
247
248 /**
249  * Open file using filename
250  * @param[in]  buf       directory buffer
251  * @param      buf_size  directory buffer size
252  * @param[in]  filename
253  * @param      filename_size size of filename
254  * @return NULL on error
255  */
256 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
257 {
258     const uint8_t *buf_end = buf + buf_size;
259
260     while(buf + 48 <= buf_end) {
261         int dir_length, name_size, first_sector, depth;
262         uint64_t file_length;
263         const uint8_t *name;
264         if (ff_guidcmp(buf, dir_entry_guid)) {
265             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
266                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
267             break;
268         }
269         dir_length  = AV_RL16(buf + 16);
270         file_length = AV_RL64(buf + 24);
271         name_size   = 2 * AV_RL32(buf + 32);
272         if (name_size < 0) {
273             av_log(s, AV_LOG_ERROR,
274                    "bad filename length, remaining directory entries ignored\n");
275             break;
276         }
277         if (48 + name_size > buf_end - buf) {
278             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
279             break;
280         }
281         first_sector = AV_RL32(buf + 40 + name_size);
282         depth        = AV_RL32(buf + 44 + name_size);
283
284         /* compare file name; test optional null terminator */
285         name = buf + 40;
286         if (name_size >= filename_size &&
287             !memcmp(name, filename, filename_size) &&
288             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
289             return wtvfile_open_sector(first_sector, file_length, depth, s);
290
291         buf += dir_length;
292     }
293     return 0;
294 }
295
296 #define wtvfile_open(s, buf, buf_size, filename) \
297     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
298
299 /**
300  * Close file opened with wtvfile_open_sector(), or wtv_open()
301  */
302 static void wtvfile_close(AVIOContext *pb)
303 {
304     WtvFile *wf = pb->opaque;
305     av_free(wf->sectors);
306     av_free(wf);
307     av_free(pb->buffer);
308     av_free(pb);
309 }
310
311 /*
312  *
313  * Main demuxer
314  *
315  */
316
317 typedef struct {
318     int seen_data;
319 } WtvStream;
320
321 typedef struct {
322     AVIOContext *pb;       /** timeline file */
323     int64_t epoch;
324     int64_t pts;             /** pts for next data chunk */
325     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
326
327     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
328        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
329     AVIndexEntry *index_entries;
330     int nb_index_entries;
331     unsigned int index_entries_allocated_size;
332 } WtvContext;
333
334 /* WTV GUIDs */
335 static const ff_asf_guid wtv_guid =
336     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
337 static const ff_asf_guid metadata_guid =
338     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
339 static const ff_asf_guid timestamp_guid =
340     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
341 static const ff_asf_guid data_guid =
342     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
343 static const ff_asf_guid stream_guid =
344     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
345 static const ff_asf_guid stream2_guid =
346     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
347 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
348     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
349 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
350     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
351 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
352     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
353 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
354     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
355 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
356     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
357 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
358     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
359 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
360     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
361 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
362     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
363 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
364     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
365
366 /* Windows media GUIDs */
367
368 /* Media types */
369 static const ff_asf_guid mediatype_audio =
370     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
371 static const ff_asf_guid mediatype_video =
372     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
373 static const ff_asf_guid mediasubtype_mpeg1payload =
374     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
375 static const ff_asf_guid mediatype_mpeg2_sections =
376     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
377 static const ff_asf_guid mediatype_mpeg2_pes =
378     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
379 static const ff_asf_guid mediatype_mstvcaption =
380     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
381
382 /* Media subtypes */
383 static const ff_asf_guid mediasubtype_cpfilters_processed =
384     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
385 static const ff_asf_guid mediasubtype_dvb_subtitle =
386     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
387 static const ff_asf_guid mediasubtype_teletext =
388     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
389 static const ff_asf_guid mediasubtype_dtvccdata =
390     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
391 static const ff_asf_guid mediasubtype_mpeg2_sections =
392     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
393
394 /* Formats */
395 static const ff_asf_guid format_cpfilters_processed =
396     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
397 static const ff_asf_guid format_waveformatex =
398     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
399 static const ff_asf_guid format_videoinfo2 =
400     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
401 static const ff_asf_guid format_mpeg2_video =
402     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
403 static const ff_asf_guid format_none =
404     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
405
406 static const AVCodecGuid video_guids[] = {
407     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
408     {AV_CODEC_ID_NONE}
409 };
410
411 static int read_probe(AVProbeData *p)
412 {
413     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
414 }
415
416 /**
417  * Convert win32 FILETIME to ISO-8601 string
418  */
419 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
420 {
421     time_t t = (value / 10000000LL) - 11644473600LL;
422     struct tm *tm = gmtime(&t);
423     if (tm)
424         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
425     else
426         buf[0] = '\0';
427 }
428
429 /**
430  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
431  */
432 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
433 {
434     time_t t = (value / 10000000LL) - 719162LL*86400LL;
435     struct tm *tm = gmtime(&t);
436     if (tm)
437         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
438     else
439         buf[0] = '\0';
440 }
441
442 /**
443  * Convert OLE DATE to ISO-8601 string
444  */
445 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
446 {
447     time_t t = 631112400LL + 86400*av_int2double(value);
448     struct tm *tm = gmtime(&t);
449     if (tm)
450         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
451     else
452         buf[0] = '\0';
453 }
454
455 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
456 {
457     char mime[1024];
458     char description[1024];
459     unsigned int filesize;
460     AVStream *st;
461     int64_t pos = avio_tell(pb);
462
463     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
464     if (strcmp(mime, "image/jpeg"))
465         goto done;
466
467     avio_r8(pb);
468     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
469     filesize = avio_rl32(pb);
470     if (!filesize)
471         goto done;
472
473     st = avformat_new_stream(s, NULL);
474     if (!st)
475         goto done;
476     av_dict_set(&st->metadata, "title", description, 0);
477     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
478     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
479     st->codec->extradata  = av_mallocz(filesize);
480     st->id = -1;
481     if (!st->codec->extradata)
482         goto done;
483     st->codec->extradata_size = filesize;
484     avio_read(pb, st->codec->extradata, filesize);
485 done:
486     avio_seek(pb, pos + length, SEEK_SET);
487 }
488
489 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
490 {
491     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
492     char *buf = av_malloc(buf_size);
493     if (!buf)
494         return;
495
496     if (type == 0 && length == 4) {
497         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
498     } else if (type == 1) {
499         avio_get_str16le(pb, length, buf, buf_size);
500         if (!strlen(buf)) {
501            av_free(buf);
502            return;
503         }
504     } else if (type == 3 && length == 4) {
505         strcpy(buf, avio_rl32(pb) ? "true" : "false");
506     } else if (type == 4 && length == 8) {
507         int64_t num = avio_rl64(pb);
508         if (!strcmp(key, "WM/EncodingTime") ||
509             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
510             filetime_to_iso8601(buf, buf_size, num);
511         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
512                  !strcmp(key, "WM/WMRVEndTime"))
513             crazytime_to_iso8601(buf, buf_size, num);
514         else if (!strcmp(key, "WM/WMRVExpirationDate"))
515             oledate_to_iso8601(buf, buf_size, num);
516         else if (!strcmp(key, "WM/WMRVBitrate"))
517             snprintf(buf, buf_size, "%f", av_int2double(num));
518         else
519             snprintf(buf, buf_size, "%"PRIi64, num);
520     } else if (type == 5 && length == 2) {
521         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
522     } else if (type == 6 && length == 16) {
523         ff_asf_guid guid;
524         avio_read(pb, guid, 16);
525         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
526     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
527         get_attachment(s, pb, length);
528         av_freep(&buf);
529         return;
530     } else {
531         av_freep(&buf);
532         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
533         avio_skip(pb, length);
534         return;
535     }
536
537     av_dict_set(&s->metadata, key, buf, 0);
538     av_freep(&buf);
539 }
540
541 /**
542  * Parse metadata entries
543  */
544 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
545 {
546     ff_asf_guid guid;
547     int length, type;
548     while(!pb->eof_reached) {
549         char key[1024];
550         ff_get_guid(pb, &guid);
551         type   = avio_rl32(pb);
552         length = avio_rl32(pb);
553         if (!length)
554             break;
555         if (ff_guidcmp(&guid, metadata_guid)) {
556             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
557                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
558             break;
559         }
560         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
561         get_tag(s, pb, key, type, length);
562     }
563
564     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
565 }
566
567 /**
568  * parse VIDEOINFOHEADER2 structure
569  * @return bytes consumed
570  */
571 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
572 {
573     WtvContext *wtv = s->priv_data;
574     AVIOContext *pb = wtv->pb;
575
576     avio_skip(pb, 72);  // picture aspect ratio is unreliable
577     ff_get_bmp_header(pb, st);
578
579     return 72 + 40;
580 }
581
582 /**
583  * Parse MPEG1WAVEFORMATEX extradata structure
584  */
585 static void parse_mpeg1waveformatex(AVStream *st)
586 {
587     /* fwHeadLayer */
588     switch (AV_RL16(st->codec->extradata)) {
589     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
590     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
591     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
592     }
593
594     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
595
596     /* dwHeadMode */
597     switch (AV_RL16(st->codec->extradata + 6)) {
598     case 1 :
599     case 2 :
600     case 4 : st->codec->channels       = 2;
601              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
602              break;
603     case 8 : st->codec->channels       = 1;
604              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
605              break;
606     }
607 }
608
609 /**
610  * Initialise stream
611  * @param st Stream to initialise, or NULL to create and initialise new stream
612  * @return NULL on error
613  */
614 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
615 {
616     if (st) {
617         if (st->codec->extradata) {
618             av_freep(&st->codec->extradata);
619             st->codec->extradata_size = 0;
620         }
621     } else {
622         WtvStream *wst = av_mallocz(sizeof(WtvStream));
623         if (!wst)
624             return NULL;
625         st = avformat_new_stream(s, NULL);
626         if (!st)
627             return NULL;
628         st->id = sid;
629         st->priv_data = wst;
630     }
631     st->codec->codec_type = codec_type;
632     st->need_parsing      = AVSTREAM_PARSE_FULL;
633     avpriv_set_pts_info(st, 64, 1, 10000000);
634     return st;
635 }
636
637 /**
638  * parse Media Type structure and populate stream
639  * @param st         Stream, or NULL to create new stream
640  * @param mediatype  Mediatype GUID
641  * @param subtype    Subtype GUID
642  * @param formattype Format GUID
643  * @param size       Size of format buffer
644  * @return NULL on error
645  */
646 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
647                                    ff_asf_guid mediatype, ff_asf_guid subtype,
648                                    ff_asf_guid formattype, int size)
649 {
650     WtvContext *wtv = s->priv_data;
651     AVIOContext *pb = wtv->pb;
652     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
653         !ff_guidcmp(formattype, format_cpfilters_processed)) {
654         ff_asf_guid actual_subtype;
655         ff_asf_guid actual_formattype;
656
657         if (size < 32) {
658             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
659             avio_skip(pb, size);
660             return NULL;
661         }
662
663         avio_skip(pb, size - 32);
664         ff_get_guid(pb, &actual_subtype);
665         ff_get_guid(pb, &actual_formattype);
666         avio_seek(pb, -size, SEEK_CUR);
667
668         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
669         avio_skip(pb, 32);
670         return st;
671     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
672         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
673         if (!st)
674             return NULL;
675         if (!ff_guidcmp(formattype, format_waveformatex)) {
676             int ret = ff_get_wav_header(pb, st->codec, size);
677             if (ret < 0)
678                 return NULL;
679         } else {
680             if (ff_guidcmp(formattype, 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         }
684
685         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
686             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
687         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
688             if (st->codec->extradata && st->codec->extradata_size >= 22)
689                 parse_mpeg1waveformatex(st);
690             else
691                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
692         } else {
693             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
694             if (st->codec->codec_id == AV_CODEC_ID_NONE)
695                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
696         }
697         return st;
698     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
699         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
700         if (!st)
701             return NULL;
702         if (!ff_guidcmp(formattype, format_videoinfo2)) {
703             int consumed = parse_videoinfoheader2(s, st);
704             avio_skip(pb, FFMAX(size - consumed, 0));
705         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
706             int consumed = parse_videoinfoheader2(s, st);
707             avio_skip(pb, FFMAX(size - consumed, 0));
708         } else {
709             if (ff_guidcmp(formattype, format_none))
710                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
711             avio_skip(pb, size);
712         }
713
714         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
715             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
716         } else {
717             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
718         }
719         if (st->codec->codec_id == AV_CODEC_ID_NONE)
720             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
721         return st;
722     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
723                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
724         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
725         if (!st)
726             return NULL;
727         if (ff_guidcmp(formattype, format_none))
728             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
729         avio_skip(pb, size);
730         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
731         return st;
732     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
733                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
734         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
735         if (!st)
736             return NULL;
737         if (ff_guidcmp(formattype, format_none))
738             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
739         avio_skip(pb, size);
740         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
741         return st;
742     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
743                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
744         if (ff_guidcmp(formattype, format_none))
745             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
746         avio_skip(pb, size);
747         return NULL;
748     }
749
750     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
751                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
752                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
753     avio_skip(pb, size);
754     return NULL;
755 }
756
757 enum {
758     SEEK_TO_DATA = 0,
759     SEEK_TO_PTS,
760 };
761
762 /**
763  * Parse WTV chunks
764  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
765  * @param seekts timestamp
766  * @param[out] len_ptr Length of data chunk
767  * @return stream index of data chunk, or <0 on error
768  */
769 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
770 {
771     WtvContext *wtv = s->priv_data;
772     AVIOContext *pb = wtv->pb;
773     while (!pb->eof_reached) {
774         ff_asf_guid g;
775         int len, sid, consumed;
776
777         ff_get_guid(pb, &g);
778         len = avio_rl32(pb);
779         if (len < 32)
780             break;
781         sid = avio_rl32(pb) & 0x7FFF;
782         avio_skip(pb, 8);
783         consumed = 32;
784
785         if (!ff_guidcmp(g, stream_guid)) {
786             if (ff_find_stream_index(s, sid) < 0) {
787                 ff_asf_guid mediatype, subtype, formattype;
788                 int size;
789                 avio_skip(pb, 28);
790                 ff_get_guid(pb, &mediatype);
791                 ff_get_guid(pb, &subtype);
792                 avio_skip(pb, 12);
793                 ff_get_guid(pb, &formattype);
794                 size = avio_rl32(pb);
795                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
796                 consumed += 92 + size;
797             }
798         } else if (!ff_guidcmp(g, stream2_guid)) {
799             int stream_index = ff_find_stream_index(s, sid);
800             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
801                 ff_asf_guid mediatype, subtype, formattype;
802                 int size;
803                 avio_skip(pb, 12);
804                 ff_get_guid(pb, &mediatype);
805                 ff_get_guid(pb, &subtype);
806                 avio_skip(pb, 12);
807                 ff_get_guid(pb, &formattype);
808                 size = avio_rl32(pb);
809                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
810                 consumed += 76 + size;
811             }
812         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
813                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
814                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
815                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
816                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
817                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
818             int stream_index = ff_find_stream_index(s, sid);
819             if (stream_index >= 0) {
820                 AVStream *st = s->streams[stream_index];
821                 uint8_t buf[258];
822                 const uint8_t *pbuf = buf;
823                 int buf_size;
824
825                 avio_skip(pb, 8);
826                 consumed += 8;
827                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
828                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
829                     avio_skip(pb, 6);
830                     consumed += 6;
831                 }
832
833                 buf_size = FFMIN(len - consumed, sizeof(buf));
834                 avio_read(pb, buf, buf_size);
835                 consumed += buf_size;
836                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
837             }
838         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
839             int stream_index = ff_find_stream_index(s, sid);
840             if (stream_index >= 0) {
841                 AVStream *st = s->streams[stream_index];
842                 int audio_type;
843                 avio_skip(pb, 8);
844                 audio_type = avio_r8(pb);
845                 if (audio_type == 2)
846                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
847                 else if (audio_type == 3)
848                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
849                 consumed += 9;
850             }
851         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
852             int stream_index = ff_find_stream_index(s, sid);
853             if (stream_index >= 0) {
854                 avio_skip(pb, 12);
855                 if (avio_rl32(pb))
856                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
857                 consumed += 16;
858             }
859         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
860             int stream_index = ff_find_stream_index(s, sid);
861             if (stream_index >= 0) {
862                 AVStream *st = s->streams[stream_index];
863                 uint8_t language[4];
864                 avio_skip(pb, 12);
865                 avio_read(pb, language, 3);
866                 if (language[0]) {
867                     language[3] = 0;
868                     av_dict_set(&st->metadata, "language", language, 0);
869                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
870                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
871                 }
872                 consumed += 15;
873             }
874         } else if (!ff_guidcmp(g, timestamp_guid)) {
875             int stream_index = ff_find_stream_index(s, sid);
876             if (stream_index >= 0) {
877                 avio_skip(pb, 8);
878                 wtv->pts = avio_rl64(pb);
879                 consumed += 16;
880                 if (wtv->pts == -1)
881                     wtv->pts = AV_NOPTS_VALUE;
882                 else {
883                     wtv->last_valid_pts = wtv->pts;
884                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
885                         wtv->epoch = wtv->pts;
886                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
887 #define WTV_PAD8(x) (((x) + 7) & ~7)
888                     avio_skip(pb, WTV_PAD8(len) - consumed);
889                     return 0;
890                 }
891                 }
892             }
893         } else if (!ff_guidcmp(g, data_guid)) {
894             int stream_index = ff_find_stream_index(s, sid);
895             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
896                 WtvStream *wst = s->streams[stream_index]->priv_data;
897                 wst->seen_data = 1;
898                 if (len_ptr) {
899                     *len_ptr = len;
900                 }
901                 return stream_index;
902             }
903         } else if (
904             !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}) ||
905             !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}) ||
906             !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}) ||
907             !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}) ||
908             !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}) ||
909             !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}) ||
910             !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}) ||
911             !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}) ||
912             !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}) ||
913             !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}) ||
914             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
915             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
916             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
917             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
918             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
919             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
920             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
921             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
922             //ignore known guids
923         } else
924             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
925
926         avio_skip(pb, WTV_PAD8(len) - consumed);
927     }
928     return AVERROR_EOF;
929 }
930
931 /* declare utf16le strings */
932 #define _ , 0,
933 static const uint8_t timeline_le16[] =
934     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
935 static const uint8_t table_0_entries_legacy_attrib_le16[] =
936     {'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};
937 static const uint8_t table_0_entries_time_le16[] =
938     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
939 static const uint8_t timeline_table_0_entries_Events_le16[] =
940     {'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};
941 #undef _
942
943 static int read_header(AVFormatContext *s)
944 {
945     WtvContext *wtv = s->priv_data;
946     int root_sector, root_size;
947     uint8_t root[WTV_SECTOR_SIZE];
948     AVIOContext *pb;
949     int64_t timeline_pos;
950     int ret;
951
952     wtv->epoch          =
953     wtv->pts            =
954     wtv->last_valid_pts = AV_NOPTS_VALUE;
955
956     /* read root directory sector */
957     avio_skip(s->pb, 0x30);
958     root_size = avio_rl32(s->pb);
959     if (root_size > sizeof(root)) {
960         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
961         return AVERROR_INVALIDDATA;
962     }
963     avio_skip(s->pb, 4);
964     root_sector = avio_rl32(s->pb);
965
966     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
967     root_size = avio_read(s->pb, root, root_size);
968     if (root_size < 0)
969         return AVERROR_INVALIDDATA;
970
971     /* parse chunks up until first data chunk */
972     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
973     if (!wtv->pb) {
974         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
975         return AVERROR_INVALIDDATA;
976     }
977
978     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
979     if (ret < 0)
980         return ret;
981     avio_seek(wtv->pb, -32, SEEK_CUR);
982
983     timeline_pos = avio_tell(s->pb); // save before opening another file
984
985     /* read metadata */
986     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
987     if (pb) {
988         parse_legacy_attrib(s, pb);
989         wtvfile_close(pb);
990     }
991
992     /* read seek index */
993     if (s->nb_streams) {
994         AVStream *st = s->streams[0];
995         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
996         if (pb) {
997             while(1) {
998                 uint64_t timestamp = avio_rl64(pb);
999                 uint64_t frame_nb  = avio_rl64(pb);
1000                 if (pb->eof_reached)
1001                     break;
1002                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1003                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1004             }
1005             wtvfile_close(pb);
1006
1007             if (wtv->nb_index_entries) {
1008                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1009                 if (pb) {
1010                     int i;
1011                     while (1) {
1012                         uint64_t frame_nb = avio_rl64(pb);
1013                         uint64_t position = avio_rl64(pb);
1014                         if (pb->eof_reached)
1015                             break;
1016                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1017                             AVIndexEntry *e = wtv->index_entries + i;
1018                             if (frame_nb > e->size)
1019                                 break;
1020                             if (position > e->pos)
1021                                 e->pos = position;
1022                         }
1023                     }
1024                     wtvfile_close(pb);
1025                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1026                 }
1027             }
1028         }
1029     }
1030
1031     avio_seek(s->pb, timeline_pos, SEEK_SET);
1032     return 0;
1033 }
1034
1035 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1036 {
1037     WtvContext *wtv = s->priv_data;
1038     AVIOContext *pb = wtv->pb;
1039     int stream_index, len, ret;
1040
1041     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1042     if (stream_index < 0)
1043         return stream_index;
1044
1045     ret = av_get_packet(pb, pkt, len - 32);
1046     if (ret < 0)
1047         return ret;
1048     pkt->stream_index = stream_index;
1049     pkt->pts          = wtv->pts;
1050     avio_skip(pb, WTV_PAD8(len) - len);
1051     return 0;
1052 }
1053
1054 static int read_seek(AVFormatContext *s, int stream_index,
1055                      int64_t ts, int flags)
1056 {
1057     WtvContext *wtv = s->priv_data;
1058     AVIOContext *pb = wtv->pb;
1059     AVStream *st = s->streams[0];
1060     int64_t ts_relative;
1061     int i;
1062
1063     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1064         return AVERROR(ENOSYS);
1065
1066     /* timestamp adjustment is required because wtv->pts values are absolute,
1067      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1068     ts_relative = ts;
1069     if (wtv->epoch != AV_NOPTS_VALUE)
1070         ts_relative -= wtv->epoch;
1071
1072     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1073     if (i < 0) {
1074         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1075             avio_seek(pb, 0, SEEK_SET);
1076         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1077             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1078         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1079             return AVERROR(ERANGE);
1080         return 0;
1081     }
1082     wtv->pts = wtv->index_entries[i].timestamp;
1083     if (wtv->epoch != AV_NOPTS_VALUE)
1084         wtv->pts += wtv->epoch;
1085     wtv->last_valid_pts = wtv->pts;
1086     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1087     return 0;
1088 }
1089
1090 static int read_close(AVFormatContext *s)
1091 {
1092     WtvContext *wtv = s->priv_data;
1093     av_free(wtv->index_entries);
1094     wtvfile_close(wtv->pb);
1095     return 0;
1096 }
1097
1098 AVInputFormat ff_wtv_demuxer = {
1099     .name           = "wtv",
1100     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1101     .priv_data_size = sizeof(WtvContext),
1102     .read_probe     = read_probe,
1103     .read_header    = read_header,
1104     .read_packet    = read_packet,
1105     .read_seek      = read_seek,
1106     .read_close     = read_close,
1107     .flags          = AVFMT_SHOW_IDS,
1108 };