Use gmtime_r instead of gmtime and localtime_r instead of localtime
[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 <inttypes.h>
29
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/intfloat.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/time_internal.h"
35 #include "avformat.h"
36 #include "internal.h"
37 #include "riff.h"
38 #include "asf.h"
39 #include "mpegts.h"
40
41 /* Macros for formating GUIDs */
42 #define PRI_PRETTY_GUID \
43     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
44 #define ARG_PRETTY_GUID(g) \
45     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]
46 #define LEN_PRETTY_GUID 34
47
48 /*
49  *
50  * File system routines
51  *
52  */
53
54 #define WTV_SECTOR_BITS    12
55 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
56 #define WTV_BIGSECTOR_BITS 18
57
58 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
59
60 typedef struct {
61     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
62
63     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
64     uint32_t *sectors;   /** file allocation table */
65     int nb_sectors;      /** number of sectors */
66
67     int error;
68     int64_t position;
69     int64_t length;
70 } WtvFile;
71
72 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
73 {
74     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
75 }
76
77 /**
78  * @return bytes read, 0 on end of file, or <0 on error
79  */
80 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
81 {
82     WtvFile *wf = opaque;
83     AVIOContext *pb = wf->pb_filesystem;
84     int nread = 0;
85
86     if (wf->error || pb->error)
87         return -1;
88     if (wf->position >= wf->length || pb->eof_reached)
89         return 0;
90
91     buf_size = FFMIN(buf_size, wf->length - wf->position);
92     while(nread < buf_size) {
93         int n;
94         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
95         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
96
97         n = avio_read(pb, buf, read_request);
98         if (n <= 0)
99             break;
100         nread += n;
101         buf += n;
102         wf->position += n;
103         if (n == remaining_in_sector) {
104             int i = wf->position >> wf->sector_bits;
105             if (i >= wf->nb_sectors ||
106                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
107                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
108                 wf->error = 1;
109                 break;
110             }
111         }
112     }
113     return nread;
114 }
115
116 /**
117  * @return position (or file length)
118  */
119 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
120 {
121     WtvFile *wf = opaque;
122     AVIOContext *pb = wf->pb_filesystem;
123
124     if (whence == AVSEEK_SIZE)
125         return wf->length;
126     else if (whence == SEEK_CUR)
127         offset = wf->position + offset;
128     else if (whence == SEEK_END)
129         offset = wf->length;
130
131     wf->error = offset < 0 || offset >= wf->length ||
132                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
133                                offset & ((1 << wf->sector_bits) - 1)) < 0;
134     wf->position = offset;
135     return offset;
136 }
137
138 /**
139  * read non-zero integers (le32) from input stream
140  * @param pb
141  * @param[out] data destination
142  * @param     count maximum number of integers to read
143  * @return    total number of integers read
144  */
145 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
146 {
147     int i, total = 0;
148     for (i = 0; i < count; i++) {
149         if ((data[total] = avio_rl32(pb)))
150            total++;
151     }
152     return total;
153 }
154
155 /**
156  * Open file
157  * @param first_sector  First sector
158  * @param length        Length of file (bytes)
159  * @param depth         File allocation table depth
160  * @return NULL on error
161  */
162 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
163 {
164     AVIOContext *pb;
165     WtvFile *wf;
166     uint8_t *buffer;
167
168     if (seek_by_sector(s->pb, first_sector, 0) < 0)
169         return NULL;
170
171     wf = av_mallocz(sizeof(WtvFile));
172     if (!wf)
173         return NULL;
174
175     if (depth == 0) {
176         wf->sectors = av_malloc(sizeof(uint32_t));
177         if (!wf->sectors) {
178             av_free(wf);
179             return NULL;
180         }
181         wf->sectors[0]  = first_sector;
182         wf->nb_sectors  = 1;
183         wf->sector_bits = WTV_SECTOR_BITS;
184     } else if (depth == 1) {
185         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
186         if (!wf->sectors) {
187             av_free(wf);
188             return NULL;
189         }
190         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
191         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
192     } else if (depth == 2) {
193         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
194         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
195         int i;
196
197         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
198         if (!wf->sectors) {
199             av_free(wf);
200             return NULL;
201         }
202         wf->nb_sectors = 0;
203         for (i = 0; i < nb_sectors1; i++) {
204             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
205                 break;
206             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
207         }
208         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
209     } else {
210         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
211         av_free(wf);
212         return NULL;
213     }
214
215     if (!wf->nb_sectors) {
216         av_free(wf->sectors);
217         av_free(wf);
218         return NULL;
219     }
220
221     /* check length */
222     length &= 0xFFFFFFFFFFFF;
223     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
224         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);
225         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
226     }
227     wf->length = length;
228
229     /* seek to initial sector */
230     wf->position = 0;
231     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
232         av_free(wf->sectors);
233         av_free(wf);
234         return NULL;
235     }
236
237     wf->pb_filesystem = s->pb;
238     buffer = av_malloc(1 << wf->sector_bits);
239     if (!buffer) {
240         av_free(wf->sectors);
241         av_free(wf);
242         return NULL;
243     }
244
245     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
246                            wtvfile_read_packet, NULL, wtvfile_seek);
247     if (!pb) {
248         av_free(buffer);
249         av_free(wf->sectors);
250         av_free(wf);
251     }
252     return pb;
253 }
254
255 static const ff_asf_guid dir_entry_guid =
256     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
257
258 /**
259  * Open file using filename
260  * @param[in]  buf       directory buffer
261  * @param      buf_size  directory buffer size
262  * @param[in]  filename
263  * @param      filename_size size of filename
264  * @return NULL on error
265  */
266 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
267 {
268     const uint8_t *buf_end = buf + buf_size;
269
270     while(buf + 48 <= buf_end) {
271         int dir_length, name_size, first_sector, depth;
272         uint64_t file_length;
273         const uint8_t *name;
274         if (ff_guidcmp(buf, dir_entry_guid)) {
275             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
276                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
277             break;
278         }
279         dir_length  = AV_RL16(buf + 16);
280         file_length = AV_RL64(buf + 24);
281         name_size   = 2 * AV_RL32(buf + 32);
282         if (name_size < 0) {
283             av_log(s, AV_LOG_ERROR,
284                    "bad filename length, remaining directory entries ignored\n");
285             break;
286         }
287         if (48 + name_size > buf_end - buf) {
288             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
289             break;
290         }
291         first_sector = AV_RL32(buf + 40 + name_size);
292         depth        = AV_RL32(buf + 44 + name_size);
293
294         /* compare file name; test optional null terminator */
295         name = buf + 40;
296         if (name_size >= filename_size &&
297             !memcmp(name, filename, filename_size) &&
298             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
299             return wtvfile_open_sector(first_sector, file_length, depth, s);
300
301         buf += dir_length;
302     }
303     return 0;
304 }
305
306 #define wtvfile_open(s, buf, buf_size, filename) \
307     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
308
309 /**
310  * Close file opened with wtvfile_open_sector(), or wtv_open()
311  */
312 static void wtvfile_close(AVIOContext *pb)
313 {
314     WtvFile *wf = pb->opaque;
315     av_free(wf->sectors);
316     av_free(wf);
317     av_free(pb->buffer);
318     av_free(pb);
319 }
320
321 /*
322  *
323  * Main demuxer
324  *
325  */
326
327 typedef struct {
328     int seen_data;
329 } WtvStream;
330
331 typedef struct {
332     AVIOContext *pb;       /** timeline file */
333     int64_t epoch;
334     int64_t pts;             /** pts for next data chunk */
335     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
336
337     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
338        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
339     AVIndexEntry *index_entries;
340     int nb_index_entries;
341     unsigned int index_entries_allocated_size;
342 } WtvContext;
343
344 /* WTV GUIDs */
345 static const ff_asf_guid wtv_guid =
346     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
347 static const ff_asf_guid metadata_guid =
348     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
349 static const ff_asf_guid timestamp_guid =
350     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
351 static const ff_asf_guid data_guid =
352     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
353 static const ff_asf_guid stream_guid =
354     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
355 static const ff_asf_guid stream2_guid =
356     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
357 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
358     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
359 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
360     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
361 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
362     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
363 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
364     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
365 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
366     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
367 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
368     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
369 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
370     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
371 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
372     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
373 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
374     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
375
376 /* Windows media GUIDs */
377
378 /* Media types */
379 static const ff_asf_guid mediatype_audio =
380     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
381 static const ff_asf_guid mediatype_video =
382     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
383 static const ff_asf_guid mediasubtype_mpeg1payload =
384     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
385 static const ff_asf_guid mediatype_mpeg2_sections =
386     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
387 static const ff_asf_guid mediatype_mpeg2_pes =
388     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
389 static const ff_asf_guid mediatype_mstvcaption =
390     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
391
392 /* Media subtypes */
393 static const ff_asf_guid mediasubtype_cpfilters_processed =
394     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
395 static const ff_asf_guid mediasubtype_dvb_subtitle =
396     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
397 static const ff_asf_guid mediasubtype_teletext =
398     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
399 static const ff_asf_guid mediasubtype_dtvccdata =
400     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
401 static const ff_asf_guid mediasubtype_mpeg2_sections =
402     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
403
404 /* Formats */
405 static const ff_asf_guid format_cpfilters_processed =
406     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
407 static const ff_asf_guid format_waveformatex =
408     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
409 static const ff_asf_guid format_videoinfo2 =
410     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
411 static const ff_asf_guid format_mpeg2_video =
412     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
413 static const ff_asf_guid format_none =
414     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
415
416 static const AVCodecGuid video_guids[] = {
417     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
418     {AV_CODEC_ID_NONE}
419 };
420
421 static int read_probe(AVProbeData *p)
422 {
423     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
424 }
425
426 /**
427  * Convert win32 FILETIME to ISO-8601 string
428  */
429 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
430 {
431     time_t t = (value / 10000000LL) - 11644473600LL;
432     struct tm tmbuf;
433     struct tm *tm = gmtime_r(&t, &tmbuf);
434     if (tm) {
435         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
436             buf[0] = '\0';
437     } else
438         buf[0] = '\0';
439 }
440
441 /**
442  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
443  */
444 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
445 {
446     time_t t = (value / 10000000LL) - 719162LL*86400LL;
447     struct tm tmbuf;
448     struct tm *tm = gmtime_r(&t, &tmbuf);
449     if (tm) {
450         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
451             buf[0] = '\0';
452     } else
453         buf[0] = '\0';
454 }
455
456 /**
457  * Convert OLE DATE to ISO-8601 string
458  */
459 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
460 {
461     time_t t = 631112400LL + 86400*av_int2double(value);
462     struct tm tmbuf;
463     struct tm *tm = gmtime_r(&t, &tmbuf);
464     if (tm) {
465         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
466             buf[0] = '\0';
467     } else
468         buf[0] = '\0';
469 }
470
471 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
472 {
473     char mime[1024];
474     char description[1024];
475     unsigned int filesize;
476     AVStream *st;
477     int64_t pos = avio_tell(pb);
478
479     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
480     if (strcmp(mime, "image/jpeg"))
481         goto done;
482
483     avio_r8(pb);
484     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
485     filesize = avio_rl32(pb);
486     if (!filesize)
487         goto done;
488
489     st = avformat_new_stream(s, NULL);
490     if (!st)
491         goto done;
492     av_dict_set(&st->metadata, "title", description, 0);
493     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
494     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
495     st->codec->extradata  = av_mallocz(filesize);
496     st->id = -1;
497     if (!st->codec->extradata)
498         goto done;
499     st->codec->extradata_size = filesize;
500     avio_read(pb, st->codec->extradata, filesize);
501 done:
502     avio_seek(pb, pos + length, SEEK_SET);
503 }
504
505 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
506 {
507     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
508     char *buf = av_malloc(buf_size);
509     if (!buf)
510         return;
511
512     if (type == 0 && length == 4) {
513         snprintf(buf, buf_size, "%u", avio_rl32(pb));
514     } else if (type == 1) {
515         avio_get_str16le(pb, length, buf, buf_size);
516         if (!strlen(buf)) {
517            av_free(buf);
518            return;
519         }
520     } else if (type == 3 && length == 4) {
521         strcpy(buf, avio_rl32(pb) ? "true" : "false");
522     } else if (type == 4 && length == 8) {
523         int64_t num = avio_rl64(pb);
524         if (!strcmp(key, "WM/EncodingTime") ||
525             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
526             filetime_to_iso8601(buf, buf_size, num);
527         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
528                  !strcmp(key, "WM/WMRVEndTime"))
529             crazytime_to_iso8601(buf, buf_size, num);
530         else if (!strcmp(key, "WM/WMRVExpirationDate"))
531             oledate_to_iso8601(buf, buf_size, num);
532         else if (!strcmp(key, "WM/WMRVBitrate"))
533             snprintf(buf, buf_size, "%f", av_int2double(num));
534         else
535             snprintf(buf, buf_size, "%"PRIi64, num);
536     } else if (type == 5 && length == 2) {
537         snprintf(buf, buf_size, "%u", avio_rl16(pb));
538     } else if (type == 6 && length == 16) {
539         ff_asf_guid guid;
540         avio_read(pb, guid, 16);
541         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
542     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
543         get_attachment(s, pb, length);
544         av_freep(&buf);
545         return;
546     } else {
547         av_freep(&buf);
548         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
549         avio_skip(pb, length);
550         return;
551     }
552
553     av_dict_set(&s->metadata, key, buf, 0);
554     av_freep(&buf);
555 }
556
557 /**
558  * Parse metadata entries
559  */
560 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
561 {
562     ff_asf_guid guid;
563     int length, type;
564     while(!pb->eof_reached) {
565         char key[1024];
566         ff_get_guid(pb, &guid);
567         type   = avio_rl32(pb);
568         length = avio_rl32(pb);
569         if (!length)
570             break;
571         if (ff_guidcmp(&guid, metadata_guid)) {
572             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
573                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
574             break;
575         }
576         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
577         get_tag(s, pb, key, type, length);
578     }
579
580     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
581 }
582
583 /**
584  * parse VIDEOINFOHEADER2 structure
585  * @return bytes consumed
586  */
587 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
588 {
589     WtvContext *wtv = s->priv_data;
590     AVIOContext *pb = wtv->pb;
591
592     avio_skip(pb, 72);  // picture aspect ratio is unreliable
593     ff_get_bmp_header(pb, st);
594
595     return 72 + 40;
596 }
597
598 /**
599  * Parse MPEG1WAVEFORMATEX extradata structure
600  */
601 static void parse_mpeg1waveformatex(AVStream *st)
602 {
603     /* fwHeadLayer */
604     switch (AV_RL16(st->codec->extradata)) {
605     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
606     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
607     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
608     }
609
610     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
611
612     /* dwHeadMode */
613     switch (AV_RL16(st->codec->extradata + 6)) {
614     case 1 :
615     case 2 :
616     case 4 : st->codec->channels       = 2;
617              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
618              break;
619     case 8 : st->codec->channels       = 1;
620              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
621              break;
622     }
623 }
624
625 /**
626  * Initialise stream
627  * @param st Stream to initialise, or NULL to create and initialise new stream
628  * @return NULL on error
629  */
630 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
631 {
632     if (st) {
633         if (st->codec->extradata) {
634             av_freep(&st->codec->extradata);
635             st->codec->extradata_size = 0;
636         }
637     } else {
638         WtvStream *wst = av_mallocz(sizeof(WtvStream));
639         if (!wst)
640             return NULL;
641         st = avformat_new_stream(s, NULL);
642         if (!st) {
643             av_free(wst);
644             return NULL;
645         }
646         st->id = sid;
647         st->priv_data = wst;
648     }
649     st->codec->codec_type = codec_type;
650     st->need_parsing      = AVSTREAM_PARSE_FULL;
651     avpriv_set_pts_info(st, 64, 1, 10000000);
652     return st;
653 }
654
655 /**
656  * parse Media Type structure and populate stream
657  * @param st         Stream, or NULL to create new stream
658  * @param mediatype  Mediatype GUID
659  * @param subtype    Subtype GUID
660  * @param formattype Format GUID
661  * @param size       Size of format buffer
662  * @return NULL on error
663  */
664 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
665                                    ff_asf_guid mediatype, ff_asf_guid subtype,
666                                    ff_asf_guid formattype, int size)
667 {
668     WtvContext *wtv = s->priv_data;
669     AVIOContext *pb = wtv->pb;
670     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
671         !ff_guidcmp(formattype, format_cpfilters_processed)) {
672         ff_asf_guid actual_subtype;
673         ff_asf_guid actual_formattype;
674
675         if (size < 32) {
676             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
677             avio_skip(pb, size);
678             return NULL;
679         }
680
681         avio_skip(pb, size - 32);
682         ff_get_guid(pb, &actual_subtype);
683         ff_get_guid(pb, &actual_formattype);
684         avio_seek(pb, -size, SEEK_CUR);
685
686         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
687         avio_skip(pb, 32);
688         return st;
689     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
690         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
691         if (!st)
692             return NULL;
693         if (!ff_guidcmp(formattype, format_waveformatex)) {
694             int ret = ff_get_wav_header(pb, st->codec, size);
695             if (ret < 0)
696                 return NULL;
697         } else {
698             if (ff_guidcmp(formattype, format_none))
699                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
700             avio_skip(pb, size);
701         }
702
703         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
704             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
705         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
706             if (st->codec->extradata && st->codec->extradata_size >= 22)
707                 parse_mpeg1waveformatex(st);
708             else
709                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
710         } else {
711             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
712             if (st->codec->codec_id == AV_CODEC_ID_NONE)
713                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
714         }
715         return st;
716     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
717         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
718         if (!st)
719             return NULL;
720         if (!ff_guidcmp(formattype, format_videoinfo2)) {
721             int consumed = parse_videoinfoheader2(s, st);
722             avio_skip(pb, FFMAX(size - consumed, 0));
723         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
724             int consumed = parse_videoinfoheader2(s, st);
725             avio_skip(pb, FFMAX(size - consumed, 0));
726         } else {
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         }
731
732         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
733             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
734         } else {
735             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
736         }
737         if (st->codec->codec_id == AV_CODEC_ID_NONE)
738             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
739         return st;
740     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
741                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
742         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
743         if (!st)
744             return NULL;
745         if (ff_guidcmp(formattype, format_none))
746             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
747         avio_skip(pb, size);
748         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
749         return st;
750     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
751                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
752         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
753         if (!st)
754             return NULL;
755         if (ff_guidcmp(formattype, format_none))
756             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
757         avio_skip(pb, size);
758         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
759         return st;
760     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
761                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
762         if (ff_guidcmp(formattype, format_none))
763             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
764         avio_skip(pb, size);
765         return NULL;
766     }
767
768     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
769                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
770                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
771     avio_skip(pb, size);
772     return NULL;
773 }
774
775 enum {
776     SEEK_TO_DATA = 0,
777     SEEK_TO_PTS,
778 };
779
780 /**
781  * Parse WTV chunks
782  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
783  * @param seekts timestamp
784  * @param[out] len_ptr Length of data chunk
785  * @return stream index of data chunk, or <0 on error
786  */
787 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
788 {
789     WtvContext *wtv = s->priv_data;
790     AVIOContext *pb = wtv->pb;
791     while (!pb->eof_reached) {
792         ff_asf_guid g;
793         int len, sid, consumed;
794
795         ff_get_guid(pb, &g);
796         len = avio_rl32(pb);
797         if (len < 32)
798             break;
799         sid = avio_rl32(pb) & 0x7FFF;
800         avio_skip(pb, 8);
801         consumed = 32;
802
803         if (!ff_guidcmp(g, stream_guid)) {
804             if (ff_find_stream_index(s, sid) < 0) {
805                 ff_asf_guid mediatype, subtype, formattype;
806                 int size;
807                 avio_skip(pb, 28);
808                 ff_get_guid(pb, &mediatype);
809                 ff_get_guid(pb, &subtype);
810                 avio_skip(pb, 12);
811                 ff_get_guid(pb, &formattype);
812                 size = avio_rl32(pb);
813                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
814                 consumed += 92 + size;
815             }
816         } else if (!ff_guidcmp(g, stream2_guid)) {
817             int stream_index = ff_find_stream_index(s, sid);
818             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
819                 ff_asf_guid mediatype, subtype, formattype;
820                 int size;
821                 avio_skip(pb, 12);
822                 ff_get_guid(pb, &mediatype);
823                 ff_get_guid(pb, &subtype);
824                 avio_skip(pb, 12);
825                 ff_get_guid(pb, &formattype);
826                 size = avio_rl32(pb);
827                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
828                 consumed += 76 + size;
829             }
830         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
831                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
832                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
833                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
834                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
835                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
836             int stream_index = ff_find_stream_index(s, sid);
837             if (stream_index >= 0) {
838                 AVStream *st = s->streams[stream_index];
839                 uint8_t buf[258];
840                 const uint8_t *pbuf = buf;
841                 int buf_size;
842
843                 avio_skip(pb, 8);
844                 consumed += 8;
845                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
846                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
847                     avio_skip(pb, 6);
848                     consumed += 6;
849                 }
850
851                 buf_size = FFMIN(len - consumed, sizeof(buf));
852                 avio_read(pb, buf, buf_size);
853                 consumed += buf_size;
854                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
855             }
856         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
857             int stream_index = ff_find_stream_index(s, sid);
858             if (stream_index >= 0) {
859                 AVStream *st = s->streams[stream_index];
860                 int audio_type;
861                 avio_skip(pb, 8);
862                 audio_type = avio_r8(pb);
863                 if (audio_type == 2)
864                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
865                 else if (audio_type == 3)
866                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
867                 consumed += 9;
868             }
869         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
870             int stream_index = ff_find_stream_index(s, sid);
871             if (stream_index >= 0) {
872                 avio_skip(pb, 12);
873                 if (avio_rl32(pb))
874                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
875                 consumed += 16;
876             }
877         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
878             int stream_index = ff_find_stream_index(s, sid);
879             if (stream_index >= 0) {
880                 AVStream *st = s->streams[stream_index];
881                 uint8_t language[4];
882                 avio_skip(pb, 12);
883                 avio_read(pb, language, 3);
884                 if (language[0]) {
885                     language[3] = 0;
886                     av_dict_set(&st->metadata, "language", language, 0);
887                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
888                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
889                 }
890                 consumed += 15;
891             }
892         } else if (!ff_guidcmp(g, timestamp_guid)) {
893             int stream_index = ff_find_stream_index(s, sid);
894             if (stream_index >= 0) {
895                 avio_skip(pb, 8);
896                 wtv->pts = avio_rl64(pb);
897                 consumed += 16;
898                 if (wtv->pts == -1)
899                     wtv->pts = AV_NOPTS_VALUE;
900                 else {
901                     wtv->last_valid_pts = wtv->pts;
902                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
903                         wtv->epoch = wtv->pts;
904                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
905 #define WTV_PAD8(x) (((x) + 7) & ~7)
906                     avio_skip(pb, WTV_PAD8(len) - consumed);
907                     return 0;
908                 }
909                 }
910             }
911         } else if (!ff_guidcmp(g, data_guid)) {
912             int stream_index = ff_find_stream_index(s, sid);
913             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
914                 WtvStream *wst = s->streams[stream_index]->priv_data;
915                 wst->seen_data = 1;
916                 if (len_ptr) {
917                     *len_ptr = len;
918                 }
919                 return stream_index;
920             }
921         } else if (
922             !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}) ||
923             !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}) ||
924             !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}) ||
925             !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}) ||
926             !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}) ||
927             !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}) ||
928             !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}) ||
929             !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}) ||
930             !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}) ||
931             !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}) ||
932             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
933             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
934             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
935             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
936             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
937             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
938             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
939             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
940             //ignore known guids
941         } else
942             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
943
944         avio_skip(pb, WTV_PAD8(len) - consumed);
945     }
946     return AVERROR_EOF;
947 }
948
949 /* declare utf16le strings */
950 #define _ , 0,
951 static const uint8_t timeline_le16[] =
952     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
953 static const uint8_t table_0_entries_legacy_attrib_le16[] =
954     {'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};
955 static const uint8_t table_0_entries_time_le16[] =
956     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
957 static const uint8_t timeline_table_0_entries_Events_le16[] =
958     {'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};
959 #undef _
960
961 static int read_header(AVFormatContext *s)
962 {
963     WtvContext *wtv = s->priv_data;
964     int root_sector, root_size;
965     uint8_t root[WTV_SECTOR_SIZE];
966     AVIOContext *pb;
967     int64_t timeline_pos;
968     int ret;
969
970     wtv->epoch          =
971     wtv->pts            =
972     wtv->last_valid_pts = AV_NOPTS_VALUE;
973
974     /* read root directory sector */
975     avio_skip(s->pb, 0x30);
976     root_size = avio_rl32(s->pb);
977     if (root_size > sizeof(root)) {
978         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
979         return AVERROR_INVALIDDATA;
980     }
981     avio_skip(s->pb, 4);
982     root_sector = avio_rl32(s->pb);
983
984     ret = seek_by_sector(s->pb, root_sector, 0);
985     if (ret < 0)
986         return ret;
987     root_size = avio_read(s->pb, root, root_size);
988     if (root_size < 0)
989         return AVERROR_INVALIDDATA;
990
991     /* parse chunks up until first data chunk */
992     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
993     if (!wtv->pb) {
994         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
995         return AVERROR_INVALIDDATA;
996     }
997
998     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
999     if (ret < 0)
1000         return ret;
1001     avio_seek(wtv->pb, -32, SEEK_CUR);
1002
1003     timeline_pos = avio_tell(s->pb); // save before opening another file
1004
1005     /* read metadata */
1006     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1007     if (pb) {
1008         parse_legacy_attrib(s, pb);
1009         wtvfile_close(pb);
1010     }
1011
1012     /* read seek index */
1013     if (s->nb_streams) {
1014         AVStream *st = s->streams[0];
1015         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1016         if (pb) {
1017             while(1) {
1018                 uint64_t timestamp = avio_rl64(pb);
1019                 uint64_t frame_nb  = avio_rl64(pb);
1020                 if (pb->eof_reached)
1021                     break;
1022                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1023                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1024             }
1025             wtvfile_close(pb);
1026
1027             if (wtv->nb_index_entries) {
1028                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1029                 if (pb) {
1030                     int i;
1031                     while (1) {
1032                         uint64_t frame_nb = avio_rl64(pb);
1033                         uint64_t position = avio_rl64(pb);
1034                         if (pb->eof_reached)
1035                             break;
1036                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1037                             AVIndexEntry *e = wtv->index_entries + i;
1038                             if (frame_nb > e->size)
1039                                 break;
1040                             if (position > e->pos)
1041                                 e->pos = position;
1042                         }
1043                     }
1044                     wtvfile_close(pb);
1045                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1046                 }
1047             }
1048         }
1049     }
1050
1051     avio_seek(s->pb, timeline_pos, SEEK_SET);
1052     return 0;
1053 }
1054
1055 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1056 {
1057     WtvContext *wtv = s->priv_data;
1058     AVIOContext *pb = wtv->pb;
1059     int stream_index, len, ret;
1060
1061     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1062     if (stream_index < 0)
1063         return stream_index;
1064
1065     ret = av_get_packet(pb, pkt, len - 32);
1066     if (ret < 0)
1067         return ret;
1068     pkt->stream_index = stream_index;
1069     pkt->pts          = wtv->pts;
1070     avio_skip(pb, WTV_PAD8(len) - len);
1071     return 0;
1072 }
1073
1074 static int read_seek(AVFormatContext *s, int stream_index,
1075                      int64_t ts, int flags)
1076 {
1077     WtvContext *wtv = s->priv_data;
1078     AVIOContext *pb = wtv->pb;
1079     AVStream *st = s->streams[0];
1080     int64_t ts_relative;
1081     int i;
1082
1083     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1084         return AVERROR(ENOSYS);
1085
1086     /* timestamp adjustment is required because wtv->pts values are absolute,
1087      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1088     ts_relative = ts;
1089     if (wtv->epoch != AV_NOPTS_VALUE)
1090         ts_relative -= wtv->epoch;
1091
1092     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1093     if (i < 0) {
1094         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1095             avio_seek(pb, 0, SEEK_SET);
1096         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1097             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1098         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1099             return AVERROR(ERANGE);
1100         return 0;
1101     }
1102     wtv->pts = wtv->index_entries[i].timestamp;
1103     if (wtv->epoch != AV_NOPTS_VALUE)
1104         wtv->pts += wtv->epoch;
1105     wtv->last_valid_pts = wtv->pts;
1106     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1107     return 0;
1108 }
1109
1110 static int read_close(AVFormatContext *s)
1111 {
1112     WtvContext *wtv = s->priv_data;
1113     av_free(wtv->index_entries);
1114     wtvfile_close(wtv->pb);
1115     return 0;
1116 }
1117
1118 AVInputFormat ff_wtv_demuxer = {
1119     .name           = "wtv",
1120     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1121     .priv_data_size = sizeof(WtvContext),
1122     .read_probe     = read_probe,
1123     .read_header    = read_header,
1124     .read_packet    = read_packet,
1125     .read_seek      = read_seek,
1126     .read_close     = read_close,
1127     .flags          = AVFMT_SHOW_IDS,
1128 };