wtv: clean memory on error
[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 "avformat.h"
35 #include "internal.h"
36 #include "riff.h"
37 #include "asf.h"
38 #include "mpegts.h"
39
40 /* Macros for formating GUIDs */
41 #define PRI_PRETTY_GUID \
42     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
43 #define ARG_PRETTY_GUID(g) \
44     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
45 #define LEN_PRETTY_GUID 34
46
47 /*
48  *
49  * File system routines
50  *
51  */
52
53 #define WTV_SECTOR_BITS    12
54 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
55 #define WTV_BIGSECTOR_BITS 18
56
57 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
58
59 typedef struct {
60     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
61
62     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
63     uint32_t *sectors;   /** file allocation table */
64     int nb_sectors;      /** number of sectors */
65
66     int error;
67     int64_t position;
68     int64_t length;
69 } WtvFile;
70
71 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
72 {
73     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
74 }
75
76 /**
77  * @return bytes read, 0 on end of file, or <0 on error
78  */
79 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
80 {
81     WtvFile *wf = opaque;
82     AVIOContext *pb = wf->pb_filesystem;
83     int nread = 0;
84
85     if (wf->error || pb->error)
86         return -1;
87     if (wf->position >= wf->length || pb->eof_reached)
88         return 0;
89
90     buf_size = FFMIN(buf_size, wf->length - wf->position);
91     while(nread < buf_size) {
92         int n;
93         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
94         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
95
96         n = avio_read(pb, buf, read_request);
97         if (n <= 0)
98             break;
99         nread += n;
100         buf += n;
101         wf->position += n;
102         if (n == remaining_in_sector) {
103             int i = wf->position >> wf->sector_bits;
104             if (i >= wf->nb_sectors ||
105                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
106                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
107                 wf->error = 1;
108                 break;
109             }
110         }
111     }
112     return nread;
113 }
114
115 /**
116  * @return position (or file length)
117  */
118 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
119 {
120     WtvFile *wf = opaque;
121     AVIOContext *pb = wf->pb_filesystem;
122
123     if (whence == AVSEEK_SIZE)
124         return wf->length;
125     else if (whence == SEEK_CUR)
126         offset = wf->position + offset;
127     else if (whence == SEEK_END)
128         offset = wf->length;
129
130     wf->error = offset < 0 || offset >= wf->length ||
131                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
132                                offset & ((1 << wf->sector_bits) - 1)) < 0;
133     wf->position = offset;
134     return offset;
135 }
136
137 /**
138  * read non-zero integers (le32) from input stream
139  * @param pb
140  * @param[out] data destination
141  * @param     count maximum number of integers to read
142  * @return    total number of integers read
143  */
144 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
145 {
146     int i, total = 0;
147     for (i = 0; i < count; i++) {
148         if ((data[total] = avio_rl32(pb)))
149            total++;
150     }
151     return total;
152 }
153
154 /**
155  * Open file
156  * @param first_sector  First sector
157  * @param length        Length of file (bytes)
158  * @param depth         File allocation table depth
159  * @return NULL on error
160  */
161 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
162 {
163     AVIOContext *pb;
164     WtvFile *wf;
165     uint8_t *buffer;
166
167     if (seek_by_sector(s->pb, first_sector, 0) < 0)
168         return NULL;
169
170     wf = av_mallocz(sizeof(WtvFile));
171     if (!wf)
172         return NULL;
173
174     if (depth == 0) {
175         wf->sectors = av_malloc(sizeof(uint32_t));
176         if (!wf->sectors) {
177             av_free(wf);
178             return NULL;
179         }
180         wf->sectors[0]  = first_sector;
181         wf->nb_sectors  = 1;
182         wf->sector_bits = WTV_SECTOR_BITS;
183     } else if (depth == 1) {
184         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
185         if (!wf->sectors) {
186             av_free(wf);
187             return NULL;
188         }
189         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
190         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
191     } else if (depth == 2) {
192         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
193         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
194         int i;
195
196         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
197         if (!wf->sectors) {
198             av_free(wf);
199             return NULL;
200         }
201         wf->nb_sectors = 0;
202         for (i = 0; i < nb_sectors1; i++) {
203             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
204                 break;
205             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
206         }
207         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
208     } else {
209         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
210         av_free(wf);
211         return NULL;
212     }
213
214     if (!wf->nb_sectors) {
215         av_free(wf->sectors);
216         av_free(wf);
217         return NULL;
218     }
219
220     /* check length */
221     length &= 0xFFFFFFFFFFFF;
222     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
223         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);
224         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
225     }
226     wf->length = length;
227
228     /* seek to initial sector */
229     wf->position = 0;
230     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
231         av_free(wf->sectors);
232         av_free(wf);
233         return NULL;
234     }
235
236     wf->pb_filesystem = s->pb;
237     buffer = av_malloc(1 << wf->sector_bits);
238     if (!buffer) {
239         av_free(wf->sectors);
240         av_free(wf);
241         return NULL;
242     }
243
244     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
245                            wtvfile_read_packet, NULL, wtvfile_seek);
246     if (!pb) {
247         av_free(buffer);
248         av_free(wf->sectors);
249         av_free(wf);
250     }
251     return pb;
252 }
253
254 static const ff_asf_guid dir_entry_guid =
255     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
256
257 /**
258  * Open file using filename
259  * @param[in]  buf       directory buffer
260  * @param      buf_size  directory buffer size
261  * @param[in]  filename
262  * @param      filename_size size of filename
263  * @return NULL on error
264  */
265 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
266 {
267     const uint8_t *buf_end = buf + buf_size;
268
269     while(buf + 48 <= buf_end) {
270         int dir_length, name_size, first_sector, depth;
271         uint64_t file_length;
272         const uint8_t *name;
273         if (ff_guidcmp(buf, dir_entry_guid)) {
274             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
275                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
276             break;
277         }
278         dir_length  = AV_RL16(buf + 16);
279         file_length = AV_RL64(buf + 24);
280         name_size   = 2 * AV_RL32(buf + 32);
281         if (name_size < 0) {
282             av_log(s, AV_LOG_ERROR,
283                    "bad filename length, remaining directory entries ignored\n");
284             break;
285         }
286         if (48 + name_size > buf_end - buf) {
287             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
288             break;
289         }
290         first_sector = AV_RL32(buf + 40 + name_size);
291         depth        = AV_RL32(buf + 44 + name_size);
292
293         /* compare file name; test optional null terminator */
294         name = buf + 40;
295         if (name_size >= filename_size &&
296             !memcmp(name, filename, filename_size) &&
297             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
298             return wtvfile_open_sector(first_sector, file_length, depth, s);
299
300         buf += dir_length;
301     }
302     return 0;
303 }
304
305 #define wtvfile_open(s, buf, buf_size, filename) \
306     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
307
308 /**
309  * Close file opened with wtvfile_open_sector(), or wtv_open()
310  */
311 static void wtvfile_close(AVIOContext *pb)
312 {
313     WtvFile *wf = pb->opaque;
314     av_free(wf->sectors);
315     av_free(wf);
316     av_free(pb->buffer);
317     av_free(pb);
318 }
319
320 /*
321  *
322  * Main demuxer
323  *
324  */
325
326 typedef struct {
327     int seen_data;
328 } WtvStream;
329
330 typedef struct {
331     AVIOContext *pb;       /** timeline file */
332     int64_t epoch;
333     int64_t pts;             /** pts for next data chunk */
334     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
335
336     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
337        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
338     AVIndexEntry *index_entries;
339     int nb_index_entries;
340     unsigned int index_entries_allocated_size;
341 } WtvContext;
342
343 /* WTV GUIDs */
344 static const ff_asf_guid wtv_guid =
345     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
346 static const ff_asf_guid metadata_guid =
347     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
348 static const ff_asf_guid timestamp_guid =
349     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
350 static const ff_asf_guid data_guid =
351     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
352 static const ff_asf_guid stream_guid =
353     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
354 static const ff_asf_guid stream2_guid =
355     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
356 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
357     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
358 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
359     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
360 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
361     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
362 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
363     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
364 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
365     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
366 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
367     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
368 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
369     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
370 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
371     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
372 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
373     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
374
375 /* Windows media GUIDs */
376
377 /* Media types */
378 static const ff_asf_guid mediatype_audio =
379     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
380 static const ff_asf_guid mediatype_video =
381     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
382 static const ff_asf_guid mediasubtype_mpeg1payload =
383     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
384 static const ff_asf_guid mediatype_mpeg2_sections =
385     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
386 static const ff_asf_guid mediatype_mpeg2_pes =
387     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
388 static const ff_asf_guid mediatype_mstvcaption =
389     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
390
391 /* Media subtypes */
392 static const ff_asf_guid mediasubtype_cpfilters_processed =
393     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
394 static const ff_asf_guid mediasubtype_dvb_subtitle =
395     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
396 static const ff_asf_guid mediasubtype_teletext =
397     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
398 static const ff_asf_guid mediasubtype_dtvccdata =
399     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
400 static const ff_asf_guid mediasubtype_mpeg2_sections =
401     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
402
403 /* Formats */
404 static const ff_asf_guid format_cpfilters_processed =
405     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
406 static const ff_asf_guid format_waveformatex =
407     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
408 static const ff_asf_guid format_videoinfo2 =
409     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
410 static const ff_asf_guid format_mpeg2_video =
411     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
412 static const ff_asf_guid format_none =
413     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
414
415 static const AVCodecGuid video_guids[] = {
416     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
417     {AV_CODEC_ID_NONE}
418 };
419
420 static int read_probe(AVProbeData *p)
421 {
422     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
423 }
424
425 /**
426  * Convert win32 FILETIME to ISO-8601 string
427  */
428 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
429 {
430     time_t t = (value / 10000000LL) - 11644473600LL;
431     struct tm *tm = gmtime(&t);
432     if (tm)
433         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
434     else
435         buf[0] = '\0';
436 }
437
438 /**
439  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
440  */
441 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
442 {
443     time_t t = (value / 10000000LL) - 719162LL*86400LL;
444     struct tm *tm = gmtime(&t);
445     if (tm)
446         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
447     else
448         buf[0] = '\0';
449 }
450
451 /**
452  * Convert OLE DATE to ISO-8601 string
453  */
454 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
455 {
456     time_t t = 631112400LL + 86400*av_int2double(value);
457     struct tm *tm = gmtime(&t);
458     if (tm)
459         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
460     else
461         buf[0] = '\0';
462 }
463
464 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
465 {
466     char mime[1024];
467     char description[1024];
468     unsigned int filesize;
469     AVStream *st;
470     int64_t pos = avio_tell(pb);
471
472     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
473     if (strcmp(mime, "image/jpeg"))
474         goto done;
475
476     avio_r8(pb);
477     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
478     filesize = avio_rl32(pb);
479     if (!filesize)
480         goto done;
481
482     st = avformat_new_stream(s, NULL);
483     if (!st)
484         goto done;
485     av_dict_set(&st->metadata, "title", description, 0);
486     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
487     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
488     st->codec->extradata  = av_mallocz(filesize);
489     st->id = -1;
490     if (!st->codec->extradata)
491         goto done;
492     st->codec->extradata_size = filesize;
493     avio_read(pb, st->codec->extradata, filesize);
494 done:
495     avio_seek(pb, pos + length, SEEK_SET);
496 }
497
498 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
499 {
500     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
501     char *buf = av_malloc(buf_size);
502     if (!buf)
503         return;
504
505     if (type == 0 && length == 4) {
506         snprintf(buf, buf_size, "%u", avio_rl32(pb));
507     } else if (type == 1) {
508         avio_get_str16le(pb, length, buf, buf_size);
509         if (!strlen(buf)) {
510            av_free(buf);
511            return;
512         }
513     } else if (type == 3 && length == 4) {
514         strcpy(buf, avio_rl32(pb) ? "true" : "false");
515     } else if (type == 4 && length == 8) {
516         int64_t num = avio_rl64(pb);
517         if (!strcmp(key, "WM/EncodingTime") ||
518             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
519             filetime_to_iso8601(buf, buf_size, num);
520         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
521                  !strcmp(key, "WM/WMRVEndTime"))
522             crazytime_to_iso8601(buf, buf_size, num);
523         else if (!strcmp(key, "WM/WMRVExpirationDate"))
524             oledate_to_iso8601(buf, buf_size, num);
525         else if (!strcmp(key, "WM/WMRVBitrate"))
526             snprintf(buf, buf_size, "%f", av_int2double(num));
527         else
528             snprintf(buf, buf_size, "%"PRIi64, num);
529     } else if (type == 5 && length == 2) {
530         snprintf(buf, buf_size, "%u", avio_rl16(pb));
531     } else if (type == 6 && length == 16) {
532         ff_asf_guid guid;
533         avio_read(pb, guid, 16);
534         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
535     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
536         get_attachment(s, pb, length);
537         av_freep(&buf);
538         return;
539     } else {
540         av_freep(&buf);
541         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
542         avio_skip(pb, length);
543         return;
544     }
545
546     av_dict_set(&s->metadata, key, buf, 0);
547     av_freep(&buf);
548 }
549
550 /**
551  * Parse metadata entries
552  */
553 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
554 {
555     ff_asf_guid guid;
556     int length, type;
557     while(!pb->eof_reached) {
558         char key[1024];
559         ff_get_guid(pb, &guid);
560         type   = avio_rl32(pb);
561         length = avio_rl32(pb);
562         if (!length)
563             break;
564         if (ff_guidcmp(&guid, metadata_guid)) {
565             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
566                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
567             break;
568         }
569         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
570         get_tag(s, pb, key, type, length);
571     }
572
573     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
574 }
575
576 /**
577  * parse VIDEOINFOHEADER2 structure
578  * @return bytes consumed
579  */
580 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
581 {
582     WtvContext *wtv = s->priv_data;
583     AVIOContext *pb = wtv->pb;
584
585     avio_skip(pb, 72);  // picture aspect ratio is unreliable
586     ff_get_bmp_header(pb, st);
587
588     return 72 + 40;
589 }
590
591 /**
592  * Parse MPEG1WAVEFORMATEX extradata structure
593  */
594 static void parse_mpeg1waveformatex(AVStream *st)
595 {
596     /* fwHeadLayer */
597     switch (AV_RL16(st->codec->extradata)) {
598     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
599     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
600     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
601     }
602
603     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
604
605     /* dwHeadMode */
606     switch (AV_RL16(st->codec->extradata + 6)) {
607     case 1 :
608     case 2 :
609     case 4 : st->codec->channels       = 2;
610              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
611              break;
612     case 8 : st->codec->channels       = 1;
613              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
614              break;
615     }
616 }
617
618 /**
619  * Initialise stream
620  * @param st Stream to initialise, or NULL to create and initialise new stream
621  * @return NULL on error
622  */
623 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
624 {
625     if (st) {
626         if (st->codec->extradata) {
627             av_freep(&st->codec->extradata);
628             st->codec->extradata_size = 0;
629         }
630     } else {
631         WtvStream *wst = av_mallocz(sizeof(WtvStream));
632         if (!wst)
633             return NULL;
634         st = avformat_new_stream(s, NULL);
635         if (!st) {
636             av_free(wst);
637             return NULL;
638         }
639         st->id = sid;
640         st->priv_data = wst;
641     }
642     st->codec->codec_type = codec_type;
643     st->need_parsing      = AVSTREAM_PARSE_FULL;
644     avpriv_set_pts_info(st, 64, 1, 10000000);
645     return st;
646 }
647
648 /**
649  * parse Media Type structure and populate stream
650  * @param st         Stream, or NULL to create new stream
651  * @param mediatype  Mediatype GUID
652  * @param subtype    Subtype GUID
653  * @param formattype Format GUID
654  * @param size       Size of format buffer
655  * @return NULL on error
656  */
657 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
658                                    ff_asf_guid mediatype, ff_asf_guid subtype,
659                                    ff_asf_guid formattype, int size)
660 {
661     WtvContext *wtv = s->priv_data;
662     AVIOContext *pb = wtv->pb;
663     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
664         !ff_guidcmp(formattype, format_cpfilters_processed)) {
665         ff_asf_guid actual_subtype;
666         ff_asf_guid actual_formattype;
667
668         if (size < 32) {
669             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
670             avio_skip(pb, size);
671             return NULL;
672         }
673
674         avio_skip(pb, size - 32);
675         ff_get_guid(pb, &actual_subtype);
676         ff_get_guid(pb, &actual_formattype);
677         avio_seek(pb, -size, SEEK_CUR);
678
679         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
680         avio_skip(pb, 32);
681         return st;
682     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
683         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
684         if (!st)
685             return NULL;
686         if (!ff_guidcmp(formattype, format_waveformatex)) {
687             int ret = ff_get_wav_header(pb, st->codec, size);
688             if (ret < 0)
689                 return NULL;
690         } else {
691             if (ff_guidcmp(formattype, format_none))
692                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
693             avio_skip(pb, size);
694         }
695
696         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
697             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
698         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
699             if (st->codec->extradata && st->codec->extradata_size >= 22)
700                 parse_mpeg1waveformatex(st);
701             else
702                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
703         } else {
704             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
705             if (st->codec->codec_id == AV_CODEC_ID_NONE)
706                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
707         }
708         return st;
709     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
710         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
711         if (!st)
712             return NULL;
713         if (!ff_guidcmp(formattype, format_videoinfo2)) {
714             int consumed = parse_videoinfoheader2(s, st);
715             avio_skip(pb, FFMAX(size - consumed, 0));
716         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
717             int consumed = parse_videoinfoheader2(s, st);
718             avio_skip(pb, FFMAX(size - consumed, 0));
719         } else {
720             if (ff_guidcmp(formattype, format_none))
721                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
722             avio_skip(pb, size);
723         }
724
725         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
726             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
727         } else {
728             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
729         }
730         if (st->codec->codec_id == AV_CODEC_ID_NONE)
731             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
732         return st;
733     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
734                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
735         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
736         if (!st)
737             return NULL;
738         if (ff_guidcmp(formattype, format_none))
739             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
740         avio_skip(pb, size);
741         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
742         return st;
743     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
744                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
745         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
746         if (!st)
747             return NULL;
748         if (ff_guidcmp(formattype, format_none))
749             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
750         avio_skip(pb, size);
751         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
752         return st;
753     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
754                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
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         return NULL;
759     }
760
761     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
762                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
763                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
764     avio_skip(pb, size);
765     return NULL;
766 }
767
768 enum {
769     SEEK_TO_DATA = 0,
770     SEEK_TO_PTS,
771 };
772
773 /**
774  * Parse WTV chunks
775  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
776  * @param seekts timestamp
777  * @param[out] len_ptr Length of data chunk
778  * @return stream index of data chunk, or <0 on error
779  */
780 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
781 {
782     WtvContext *wtv = s->priv_data;
783     AVIOContext *pb = wtv->pb;
784     while (!pb->eof_reached) {
785         ff_asf_guid g;
786         int len, sid, consumed;
787
788         ff_get_guid(pb, &g);
789         len = avio_rl32(pb);
790         if (len < 32)
791             break;
792         sid = avio_rl32(pb) & 0x7FFF;
793         avio_skip(pb, 8);
794         consumed = 32;
795
796         if (!ff_guidcmp(g, stream_guid)) {
797             if (ff_find_stream_index(s, sid) < 0) {
798                 ff_asf_guid mediatype, subtype, formattype;
799                 int size;
800                 avio_skip(pb, 28);
801                 ff_get_guid(pb, &mediatype);
802                 ff_get_guid(pb, &subtype);
803                 avio_skip(pb, 12);
804                 ff_get_guid(pb, &formattype);
805                 size = avio_rl32(pb);
806                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
807                 consumed += 92 + size;
808             }
809         } else if (!ff_guidcmp(g, stream2_guid)) {
810             int stream_index = ff_find_stream_index(s, sid);
811             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
812                 ff_asf_guid mediatype, subtype, formattype;
813                 int size;
814                 avio_skip(pb, 12);
815                 ff_get_guid(pb, &mediatype);
816                 ff_get_guid(pb, &subtype);
817                 avio_skip(pb, 12);
818                 ff_get_guid(pb, &formattype);
819                 size = avio_rl32(pb);
820                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
821                 consumed += 76 + size;
822             }
823         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
824                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
825                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
826                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
827                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
828                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
829             int stream_index = ff_find_stream_index(s, sid);
830             if (stream_index >= 0) {
831                 AVStream *st = s->streams[stream_index];
832                 uint8_t buf[258];
833                 const uint8_t *pbuf = buf;
834                 int buf_size;
835
836                 avio_skip(pb, 8);
837                 consumed += 8;
838                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
839                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
840                     avio_skip(pb, 6);
841                     consumed += 6;
842                 }
843
844                 buf_size = FFMIN(len - consumed, sizeof(buf));
845                 avio_read(pb, buf, buf_size);
846                 consumed += buf_size;
847                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
848             }
849         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
850             int stream_index = ff_find_stream_index(s, sid);
851             if (stream_index >= 0) {
852                 AVStream *st = s->streams[stream_index];
853                 int audio_type;
854                 avio_skip(pb, 8);
855                 audio_type = avio_r8(pb);
856                 if (audio_type == 2)
857                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
858                 else if (audio_type == 3)
859                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
860                 consumed += 9;
861             }
862         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
863             int stream_index = ff_find_stream_index(s, sid);
864             if (stream_index >= 0) {
865                 avio_skip(pb, 12);
866                 if (avio_rl32(pb))
867                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
868                 consumed += 16;
869             }
870         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
871             int stream_index = ff_find_stream_index(s, sid);
872             if (stream_index >= 0) {
873                 AVStream *st = s->streams[stream_index];
874                 uint8_t language[4];
875                 avio_skip(pb, 12);
876                 avio_read(pb, language, 3);
877                 if (language[0]) {
878                     language[3] = 0;
879                     av_dict_set(&st->metadata, "language", language, 0);
880                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
881                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
882                 }
883                 consumed += 15;
884             }
885         } else if (!ff_guidcmp(g, timestamp_guid)) {
886             int stream_index = ff_find_stream_index(s, sid);
887             if (stream_index >= 0) {
888                 avio_skip(pb, 8);
889                 wtv->pts = avio_rl64(pb);
890                 consumed += 16;
891                 if (wtv->pts == -1)
892                     wtv->pts = AV_NOPTS_VALUE;
893                 else {
894                     wtv->last_valid_pts = wtv->pts;
895                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
896                         wtv->epoch = wtv->pts;
897                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
898 #define WTV_PAD8(x) (((x) + 7) & ~7)
899                     avio_skip(pb, WTV_PAD8(len) - consumed);
900                     return 0;
901                 }
902                 }
903             }
904         } else if (!ff_guidcmp(g, data_guid)) {
905             int stream_index = ff_find_stream_index(s, sid);
906             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
907                 WtvStream *wst = s->streams[stream_index]->priv_data;
908                 wst->seen_data = 1;
909                 if (len_ptr) {
910                     *len_ptr = len;
911                 }
912                 return stream_index;
913             }
914         } else if (
915             !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}) ||
916             !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}) ||
917             !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}) ||
918             !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}) ||
919             !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}) ||
920             !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}) ||
921             !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}) ||
922             !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}) ||
923             !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}) ||
924             !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}) ||
925             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
926             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
927             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
928             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
929             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
930             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
931             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
932             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
933             //ignore known guids
934         } else
935             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
936
937         avio_skip(pb, WTV_PAD8(len) - consumed);
938     }
939     return AVERROR_EOF;
940 }
941
942 /* declare utf16le strings */
943 #define _ , 0,
944 static const uint8_t timeline_le16[] =
945     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
946 static const uint8_t table_0_entries_legacy_attrib_le16[] =
947     {'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};
948 static const uint8_t table_0_entries_time_le16[] =
949     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
950 static const uint8_t timeline_table_0_entries_Events_le16[] =
951     {'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};
952 #undef _
953
954 static int read_header(AVFormatContext *s)
955 {
956     WtvContext *wtv = s->priv_data;
957     int root_sector, root_size;
958     uint8_t root[WTV_SECTOR_SIZE];
959     AVIOContext *pb;
960     int64_t timeline_pos;
961     int ret;
962
963     wtv->epoch          =
964     wtv->pts            =
965     wtv->last_valid_pts = AV_NOPTS_VALUE;
966
967     /* read root directory sector */
968     avio_skip(s->pb, 0x30);
969     root_size = avio_rl32(s->pb);
970     if (root_size > sizeof(root)) {
971         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
972         return AVERROR_INVALIDDATA;
973     }
974     avio_skip(s->pb, 4);
975     root_sector = avio_rl32(s->pb);
976
977     ret = seek_by_sector(s->pb, root_sector, 0);
978     if (ret < 0)
979         return ret;
980     root_size = avio_read(s->pb, root, root_size);
981     if (root_size < 0)
982         return AVERROR_INVALIDDATA;
983
984     /* parse chunks up until first data chunk */
985     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
986     if (!wtv->pb) {
987         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
988         return AVERROR_INVALIDDATA;
989     }
990
991     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
992     if (ret < 0)
993         return ret;
994     avio_seek(wtv->pb, -32, SEEK_CUR);
995
996     timeline_pos = avio_tell(s->pb); // save before opening another file
997
998     /* read metadata */
999     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1000     if (pb) {
1001         parse_legacy_attrib(s, pb);
1002         wtvfile_close(pb);
1003     }
1004
1005     /* read seek index */
1006     if (s->nb_streams) {
1007         AVStream *st = s->streams[0];
1008         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1009         if (pb) {
1010             while(1) {
1011                 uint64_t timestamp = avio_rl64(pb);
1012                 uint64_t frame_nb  = avio_rl64(pb);
1013                 if (pb->eof_reached)
1014                     break;
1015                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1016                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1017             }
1018             wtvfile_close(pb);
1019
1020             if (wtv->nb_index_entries) {
1021                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1022                 if (pb) {
1023                     int i;
1024                     while (1) {
1025                         uint64_t frame_nb = avio_rl64(pb);
1026                         uint64_t position = avio_rl64(pb);
1027                         if (pb->eof_reached)
1028                             break;
1029                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1030                             AVIndexEntry *e = wtv->index_entries + i;
1031                             if (frame_nb > e->size)
1032                                 break;
1033                             if (position > e->pos)
1034                                 e->pos = position;
1035                         }
1036                     }
1037                     wtvfile_close(pb);
1038                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1039                 }
1040             }
1041         }
1042     }
1043
1044     avio_seek(s->pb, timeline_pos, SEEK_SET);
1045     return 0;
1046 }
1047
1048 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1049 {
1050     WtvContext *wtv = s->priv_data;
1051     AVIOContext *pb = wtv->pb;
1052     int stream_index, len, ret;
1053
1054     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1055     if (stream_index < 0)
1056         return stream_index;
1057
1058     ret = av_get_packet(pb, pkt, len - 32);
1059     if (ret < 0)
1060         return ret;
1061     pkt->stream_index = stream_index;
1062     pkt->pts          = wtv->pts;
1063     avio_skip(pb, WTV_PAD8(len) - len);
1064     return 0;
1065 }
1066
1067 static int read_seek(AVFormatContext *s, int stream_index,
1068                      int64_t ts, int flags)
1069 {
1070     WtvContext *wtv = s->priv_data;
1071     AVIOContext *pb = wtv->pb;
1072     AVStream *st = s->streams[0];
1073     int64_t ts_relative;
1074     int i;
1075
1076     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1077         return AVERROR(ENOSYS);
1078
1079     /* timestamp adjustment is required because wtv->pts values are absolute,
1080      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1081     ts_relative = ts;
1082     if (wtv->epoch != AV_NOPTS_VALUE)
1083         ts_relative -= wtv->epoch;
1084
1085     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1086     if (i < 0) {
1087         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1088             avio_seek(pb, 0, SEEK_SET);
1089         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1090             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1091         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1092             return AVERROR(ERANGE);
1093         return 0;
1094     }
1095     wtv->pts = wtv->index_entries[i].timestamp;
1096     if (wtv->epoch != AV_NOPTS_VALUE)
1097         wtv->pts += wtv->epoch;
1098     wtv->last_valid_pts = wtv->pts;
1099     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1100     return 0;
1101 }
1102
1103 static int read_close(AVFormatContext *s)
1104 {
1105     WtvContext *wtv = s->priv_data;
1106     av_free(wtv->index_entries);
1107     wtvfile_close(wtv->pb);
1108     return 0;
1109 }
1110
1111 AVInputFormat ff_wtv_demuxer = {
1112     .name           = "wtv",
1113     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1114     .priv_data_size = sizeof(WtvContext),
1115     .read_probe     = read_probe,
1116     .read_header    = read_header,
1117     .read_packet    = read_packet,
1118     .read_seek      = read_seek,
1119     .read_close     = read_close,
1120     .flags          = AVFMT_SHOW_IDS,
1121 };