http: Expose the content location via an AVOption
[ffmpeg.git] / libavformat / wtv.c
1 /*
2  * Windows Television (WTV) demuxer
3  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file
24  * Windows Television (WTV) demuxer
25  * @author Peter Ross <pross@xvid.org>
26  */
27
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/intfloat.h"
31 #include "libavutil/dict.h"
32 #include "avformat.h"
33 #include "internal.h"
34 #include "riff.h"
35 #include "asf.h"
36 #include "mpegts.h"
37
38 /* Macros for formating GUIDs */
39 #define PRI_PRETTY_GUID \
40     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
41 #define ARG_PRETTY_GUID(g) \
42     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
43 #define LEN_PRETTY_GUID 34
44
45 /*
46  *
47  * File system routines
48  *
49  */
50
51 #define WTV_SECTOR_BITS    12
52 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
53 #define WTV_BIGSECTOR_BITS 18
54
55 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
56
57 typedef struct {
58     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
59
60     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
61     uint32_t *sectors;   /** file allocation table */
62     int nb_sectors;      /** number of sectors */
63
64     int error;
65     int64_t position;
66     int64_t length;
67 } WtvFile;
68
69 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
70 {
71     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
72 }
73
74 /**
75  * @return bytes read, 0 on end of file, or <0 on error
76  */
77 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
78 {
79     WtvFile *wf = opaque;
80     AVIOContext *pb = wf->pb_filesystem;
81     int nread = 0;
82
83     if (wf->error || pb->error)
84         return -1;
85     if (wf->position >= wf->length || pb->eof_reached)
86         return 0;
87
88     buf_size = FFMIN(buf_size, wf->length - wf->position);
89     while(nread < buf_size) {
90         int n;
91         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
92         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
93
94         n = avio_read(pb, buf, read_request);
95         if (n <= 0)
96             break;
97         nread += n;
98         buf += n;
99         wf->position += n;
100         if (n == remaining_in_sector) {
101             int i = wf->position >> wf->sector_bits;
102             if (i >= wf->nb_sectors ||
103                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
104                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
105                 wf->error = 1;
106                 break;
107             }
108         }
109     }
110     return nread;
111 }
112
113 /**
114  * @return position (or file length)
115  */
116 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
117 {
118     WtvFile *wf = opaque;
119     AVIOContext *pb = wf->pb_filesystem;
120
121     if (whence == AVSEEK_SIZE)
122         return wf->length;
123     else if (whence == SEEK_CUR)
124         offset = wf->position + offset;
125     else if (whence == SEEK_END)
126         offset = wf->length;
127
128     wf->error = offset < 0 || offset >= wf->length ||
129                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
130                                offset & ((1 << wf->sector_bits) - 1)) < 0;
131     wf->position = offset;
132     return offset;
133 }
134
135 /**
136  * read non-zero integers (le32) from input stream
137  * @param pb
138  * @param[out] data destination
139  * @param     count maximum number of integers to read
140  * @return    total number of integers read
141  */
142 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
143 {
144     int i, total = 0;
145     for (i = 0; i < count; i++) {
146         if ((data[total] = avio_rl32(pb)))
147            total++;
148     }
149     return total;
150 }
151
152 /**
153  * Open file
154  * @param first_sector  First sector
155  * @param length        Length of file (bytes)
156  * @param depth         File allocation table depth
157  * @return NULL on error
158  */
159 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
160 {
161     AVIOContext *pb;
162     WtvFile *wf;
163     uint8_t *buffer;
164
165     if (seek_by_sector(s->pb, first_sector, 0) < 0)
166         return NULL;
167
168     wf = av_mallocz(sizeof(WtvFile));
169     if (!wf)
170         return NULL;
171
172     if (depth == 0) {
173         wf->sectors = av_malloc(sizeof(uint32_t));
174         if (!wf->sectors) {
175             av_free(wf);
176             return NULL;
177         }
178         wf->sectors[0]  = first_sector;
179         wf->nb_sectors  = 1;
180         wf->sector_bits = WTV_SECTOR_BITS;
181     } else if (depth == 1) {
182         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
183         if (!wf->sectors) {
184             av_free(wf);
185             return NULL;
186         }
187         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
188         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
189     } else if (depth == 2) {
190         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
191         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
192         int i;
193
194         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
195         if (!wf->sectors) {
196             av_free(wf);
197             return NULL;
198         }
199         wf->nb_sectors = 0;
200         for (i = 0; i < nb_sectors1; i++) {
201             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
202                 break;
203             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
204         }
205         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
206     } else {
207         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
208         av_free(wf);
209         return NULL;
210     }
211
212     if (!wf->nb_sectors) {
213         av_free(wf->sectors);
214         av_free(wf);
215         return NULL;
216     }
217
218     /* check length */
219     length &= 0xFFFFFFFFFFFF;
220     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
221         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);
222         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
223     }
224     wf->length = length;
225
226     /* seek to initial sector */
227     wf->position = 0;
228     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
229         av_free(wf->sectors);
230         av_free(wf);
231         return NULL;
232     }
233
234     wf->pb_filesystem = s->pb;
235     buffer = av_malloc(1 << wf->sector_bits);
236     if (!buffer) {
237         av_free(wf->sectors);
238         av_free(wf);
239         return NULL;
240     }
241
242     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
243                            wtvfile_read_packet, NULL, wtvfile_seek);
244     if (!pb) {
245         av_free(buffer);
246         av_free(wf->sectors);
247         av_free(wf);
248     }
249     return pb;
250 }
251
252 static const ff_asf_guid dir_entry_guid =
253     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
254
255 /**
256  * Open file using filename
257  * @param[in]  buf       directory buffer
258  * @param      buf_size  directory buffer size
259  * @param[in]  filename
260  * @param      filename_size size of filename
261  * @return NULL on error
262  */
263 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
264 {
265     const uint8_t *buf_end = buf + buf_size;
266
267     while(buf + 48 <= buf_end) {
268         int dir_length, name_size, first_sector, depth;
269         uint64_t file_length;
270         const uint8_t *name;
271         if (ff_guidcmp(buf, dir_entry_guid)) {
272             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
273                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
274             break;
275         }
276         dir_length  = AV_RL16(buf + 16);
277         file_length = AV_RL64(buf + 24);
278         name_size   = 2 * AV_RL32(buf + 32);
279         if (name_size < 0) {
280             av_log(s, AV_LOG_ERROR,
281                    "bad filename length, remaining directory entries ignored\n");
282             break;
283         }
284         if (48 + name_size > buf_end - buf) {
285             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
286             break;
287         }
288         first_sector = AV_RL32(buf + 40 + name_size);
289         depth        = AV_RL32(buf + 44 + name_size);
290
291         /* compare file name; test optional null terminator */
292         name = buf + 40;
293         if (name_size >= filename_size &&
294             !memcmp(name, filename, filename_size) &&
295             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
296             return wtvfile_open_sector(first_sector, file_length, depth, s);
297
298         buf += dir_length;
299     }
300     return 0;
301 }
302
303 #define wtvfile_open(s, buf, buf_size, filename) \
304     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
305
306 /**
307  * Close file opened with wtvfile_open_sector(), or wtv_open()
308  */
309 static void wtvfile_close(AVIOContext *pb)
310 {
311     WtvFile *wf = pb->opaque;
312     av_free(wf->sectors);
313     av_free(wf);
314     av_free(pb->buffer);
315     av_free(pb);
316 }
317
318 /*
319  *
320  * Main demuxer
321  *
322  */
323
324 typedef struct {
325     int seen_data;
326 } WtvStream;
327
328 typedef struct {
329     AVIOContext *pb;       /** timeline file */
330     int64_t epoch;
331     int64_t pts;             /** pts for next data chunk */
332     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
333
334     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
335        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
336     AVIndexEntry *index_entries;
337     int nb_index_entries;
338     unsigned int index_entries_allocated_size;
339 } WtvContext;
340
341 /* WTV GUIDs */
342 static const ff_asf_guid wtv_guid =
343     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
344 static const ff_asf_guid metadata_guid =
345     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
346 static const ff_asf_guid timestamp_guid =
347     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
348 static const ff_asf_guid data_guid =
349     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
350 static const ff_asf_guid stream_guid =
351     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
352 static const ff_asf_guid stream2_guid =
353     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
354 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
355     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
356 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
357     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
358 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
359     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
360 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
361     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
362 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
363     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
364 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
365     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
366 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
367     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
368 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
369     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
370 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
371     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
372
373 /* Windows media GUIDs */
374
375 /* Media types */
376 static const ff_asf_guid mediatype_audio =
377     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
378 static const ff_asf_guid mediatype_video =
379     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
380 static const ff_asf_guid mediasubtype_mpeg1payload =
381     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
382 static const ff_asf_guid mediatype_mpeg2_sections =
383     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
384 static const ff_asf_guid mediatype_mpeg2_pes =
385     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
386 static const ff_asf_guid mediatype_mstvcaption =
387     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
388
389 /* Media subtypes */
390 static const ff_asf_guid mediasubtype_cpfilters_processed =
391     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
392 static const ff_asf_guid mediasubtype_dvb_subtitle =
393     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
394 static const ff_asf_guid mediasubtype_teletext =
395     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
396 static const ff_asf_guid mediasubtype_dtvccdata =
397     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
398 static const ff_asf_guid mediasubtype_mpeg2_sections =
399     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
400
401 /* Formats */
402 static const ff_asf_guid format_cpfilters_processed =
403     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
404 static const ff_asf_guid format_waveformatex =
405     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
406 static const ff_asf_guid format_videoinfo2 =
407     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
408 static const ff_asf_guid format_mpeg2_video =
409     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
410 static const ff_asf_guid format_none =
411     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
412
413 static const AVCodecGuid video_guids[] = {
414     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
415     {AV_CODEC_ID_NONE}
416 };
417
418 static int read_probe(AVProbeData *p)
419 {
420     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
421 }
422
423 /**
424  * Convert win32 FILETIME to ISO-8601 string
425  */
426 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
427 {
428     time_t t = (value / 10000000LL) - 11644473600LL;
429     struct tm *tm = gmtime(&t);
430     if (tm)
431         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
432     else
433         buf[0] = '\0';
434 }
435
436 /**
437  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
438  */
439 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
440 {
441     time_t t = (value / 10000000LL) - 719162LL*86400LL;
442     struct tm *tm = gmtime(&t);
443     if (tm)
444         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
445     else
446         buf[0] = '\0';
447 }
448
449 /**
450  * Convert OLE DATE to ISO-8601 string
451  */
452 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
453 {
454     time_t t = 631112400LL + 86400*av_int2double(value);
455     struct tm *tm = gmtime(&t);
456     if (tm)
457         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
458     else
459         buf[0] = '\0';
460 }
461
462 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
463 {
464     char mime[1024];
465     char description[1024];
466     unsigned int filesize;
467     AVStream *st;
468     int64_t pos = avio_tell(pb);
469
470     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
471     if (strcmp(mime, "image/jpeg"))
472         goto done;
473
474     avio_r8(pb);
475     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
476     filesize = avio_rl32(pb);
477     if (!filesize)
478         goto done;
479
480     st = avformat_new_stream(s, NULL);
481     if (!st)
482         goto done;
483     av_dict_set(&st->metadata, "title", description, 0);
484     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
485     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
486     st->codec->extradata  = av_mallocz(filesize);
487     st->id = -1;
488     if (!st->codec->extradata)
489         goto done;
490     st->codec->extradata_size = filesize;
491     avio_read(pb, st->codec->extradata, filesize);
492 done:
493     avio_seek(pb, pos + length, SEEK_SET);
494 }
495
496 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
497 {
498     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
499     char *buf = av_malloc(buf_size);
500     if (!buf)
501         return;
502
503     if (type == 0 && length == 4) {
504         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
505     } else if (type == 1) {
506         avio_get_str16le(pb, length, buf, buf_size);
507         if (!strlen(buf)) {
508            av_free(buf);
509            return;
510         }
511     } else if (type == 3 && length == 4) {
512         strcpy(buf, avio_rl32(pb) ? "true" : "false");
513     } else if (type == 4 && length == 8) {
514         int64_t num = avio_rl64(pb);
515         if (!strcmp(key, "WM/EncodingTime") ||
516             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
517             filetime_to_iso8601(buf, buf_size, num);
518         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
519                  !strcmp(key, "WM/WMRVEndTime"))
520             crazytime_to_iso8601(buf, buf_size, num);
521         else if (!strcmp(key, "WM/WMRVExpirationDate"))
522             oledate_to_iso8601(buf, buf_size, num);
523         else if (!strcmp(key, "WM/WMRVBitrate"))
524             snprintf(buf, buf_size, "%f", av_int2double(num));
525         else
526             snprintf(buf, buf_size, "%"PRIi64, num);
527     } else if (type == 5 && length == 2) {
528         snprintf(buf, buf_size, "%u", avio_rl16(pb));
529     } else if (type == 6 && length == 16) {
530         ff_asf_guid guid;
531         avio_read(pb, guid, 16);
532         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
533     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
534         get_attachment(s, pb, length);
535         av_freep(&buf);
536         return;
537     } else {
538         av_freep(&buf);
539         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
540         avio_skip(pb, length);
541         return;
542     }
543
544     av_dict_set(&s->metadata, key, buf, 0);
545     av_freep(&buf);
546 }
547
548 /**
549  * Parse metadata entries
550  */
551 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
552 {
553     ff_asf_guid guid;
554     int length, type;
555     while(!pb->eof_reached) {
556         char key[1024];
557         ff_get_guid(pb, &guid);
558         type   = avio_rl32(pb);
559         length = avio_rl32(pb);
560         if (!length)
561             break;
562         if (ff_guidcmp(&guid, metadata_guid)) {
563             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
564                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
565             break;
566         }
567         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
568         get_tag(s, pb, key, type, length);
569     }
570
571     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
572 }
573
574 /**
575  * parse VIDEOINFOHEADER2 structure
576  * @return bytes consumed
577  */
578 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
579 {
580     WtvContext *wtv = s->priv_data;
581     AVIOContext *pb = wtv->pb;
582
583     avio_skip(pb, 72);  // picture aspect ratio is unreliable
584     ff_get_bmp_header(pb, st);
585
586     return 72 + 40;
587 }
588
589 /**
590  * Parse MPEG1WAVEFORMATEX extradata structure
591  */
592 static void parse_mpeg1waveformatex(AVStream *st)
593 {
594     /* fwHeadLayer */
595     switch (AV_RL16(st->codec->extradata)) {
596     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
597     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
598     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
599     }
600
601     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
602
603     /* dwHeadMode */
604     switch (AV_RL16(st->codec->extradata + 6)) {
605     case 1 :
606     case 2 :
607     case 4 : st->codec->channels       = 2;
608              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
609              break;
610     case 8 : st->codec->channels       = 1;
611              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
612              break;
613     }
614 }
615
616 /**
617  * Initialise stream
618  * @param st Stream to initialise, or NULL to create and initialise new stream
619  * @return NULL on error
620  */
621 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
622 {
623     if (st) {
624         if (st->codec->extradata) {
625             av_freep(&st->codec->extradata);
626             st->codec->extradata_size = 0;
627         }
628     } else {
629         WtvStream *wst = av_mallocz(sizeof(WtvStream));
630         if (!wst)
631             return NULL;
632         st = avformat_new_stream(s, NULL);
633         if (!st)
634             return NULL;
635         st->id = sid;
636         st->priv_data = wst;
637     }
638     st->codec->codec_type = codec_type;
639     st->need_parsing      = AVSTREAM_PARSE_FULL;
640     avpriv_set_pts_info(st, 64, 1, 10000000);
641     return st;
642 }
643
644 /**
645  * parse Media Type structure and populate stream
646  * @param st         Stream, or NULL to create new stream
647  * @param mediatype  Mediatype GUID
648  * @param subtype    Subtype GUID
649  * @param formattype Format GUID
650  * @param size       Size of format buffer
651  * @return NULL on error
652  */
653 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
654                                    ff_asf_guid mediatype, ff_asf_guid subtype,
655                                    ff_asf_guid formattype, int size)
656 {
657     WtvContext *wtv = s->priv_data;
658     AVIOContext *pb = wtv->pb;
659     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
660         !ff_guidcmp(formattype, format_cpfilters_processed)) {
661         ff_asf_guid actual_subtype;
662         ff_asf_guid actual_formattype;
663
664         if (size < 32) {
665             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
666             avio_skip(pb, size);
667             return NULL;
668         }
669
670         avio_skip(pb, size - 32);
671         ff_get_guid(pb, &actual_subtype);
672         ff_get_guid(pb, &actual_formattype);
673         avio_seek(pb, -size, SEEK_CUR);
674
675         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
676         avio_skip(pb, 32);
677         return st;
678     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
679         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
680         if (!st)
681             return NULL;
682         if (!ff_guidcmp(formattype, format_waveformatex)) {
683             int ret = ff_get_wav_header(pb, st->codec, size);
684             if (ret < 0)
685                 return NULL;
686         } else {
687             if (ff_guidcmp(formattype, format_none))
688                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
689             avio_skip(pb, size);
690         }
691
692         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
693             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
694         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
695             if (st->codec->extradata && st->codec->extradata_size >= 22)
696                 parse_mpeg1waveformatex(st);
697             else
698                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
699         } else {
700             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
701             if (st->codec->codec_id == AV_CODEC_ID_NONE)
702                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
703         }
704         return st;
705     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
706         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
707         if (!st)
708             return NULL;
709         if (!ff_guidcmp(formattype, format_videoinfo2)) {
710             int consumed = parse_videoinfoheader2(s, st);
711             avio_skip(pb, FFMAX(size - consumed, 0));
712         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
713             int consumed = parse_videoinfoheader2(s, st);
714             avio_skip(pb, FFMAX(size - consumed, 0));
715         } else {
716             if (ff_guidcmp(formattype, format_none))
717                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
718             avio_skip(pb, size);
719         }
720
721         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
722             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
723         } else {
724             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
725         }
726         if (st->codec->codec_id == AV_CODEC_ID_NONE)
727             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
728         return st;
729     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
730                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
731         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
732         if (!st)
733             return NULL;
734         if (ff_guidcmp(formattype, format_none))
735             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
736         avio_skip(pb, size);
737         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
738         return st;
739     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
740                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
741         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
742         if (!st)
743             return NULL;
744         if (ff_guidcmp(formattype, format_none))
745             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
746         avio_skip(pb, size);
747         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
748         return st;
749     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
750                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
751         if (ff_guidcmp(formattype, format_none))
752             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
753         avio_skip(pb, size);
754         return NULL;
755     }
756
757     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
758                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
759                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
760     avio_skip(pb, size);
761     return NULL;
762 }
763
764 enum {
765     SEEK_TO_DATA = 0,
766     SEEK_TO_PTS,
767 };
768
769 /**
770  * Parse WTV chunks
771  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
772  * @param seekts timestamp
773  * @param[out] len_ptr Length of data chunk
774  * @return stream index of data chunk, or <0 on error
775  */
776 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
777 {
778     WtvContext *wtv = s->priv_data;
779     AVIOContext *pb = wtv->pb;
780     while (!pb->eof_reached) {
781         ff_asf_guid g;
782         int len, sid, consumed;
783
784         ff_get_guid(pb, &g);
785         len = avio_rl32(pb);
786         if (len < 32)
787             break;
788         sid = avio_rl32(pb) & 0x7FFF;
789         avio_skip(pb, 8);
790         consumed = 32;
791
792         if (!ff_guidcmp(g, stream_guid)) {
793             if (ff_find_stream_index(s, sid) < 0) {
794                 ff_asf_guid mediatype, subtype, formattype;
795                 int size;
796                 avio_skip(pb, 28);
797                 ff_get_guid(pb, &mediatype);
798                 ff_get_guid(pb, &subtype);
799                 avio_skip(pb, 12);
800                 ff_get_guid(pb, &formattype);
801                 size = avio_rl32(pb);
802                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
803                 consumed += 92 + size;
804             }
805         } else if (!ff_guidcmp(g, stream2_guid)) {
806             int stream_index = ff_find_stream_index(s, sid);
807             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
808                 ff_asf_guid mediatype, subtype, formattype;
809                 int size;
810                 avio_skip(pb, 12);
811                 ff_get_guid(pb, &mediatype);
812                 ff_get_guid(pb, &subtype);
813                 avio_skip(pb, 12);
814                 ff_get_guid(pb, &formattype);
815                 size = avio_rl32(pb);
816                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
817                 consumed += 76 + size;
818             }
819         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
820                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
821                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
822                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
823                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
824                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
825             int stream_index = ff_find_stream_index(s, sid);
826             if (stream_index >= 0) {
827                 AVStream *st = s->streams[stream_index];
828                 uint8_t buf[258];
829                 const uint8_t *pbuf = buf;
830                 int buf_size;
831
832                 avio_skip(pb, 8);
833                 consumed += 8;
834                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
835                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
836                     avio_skip(pb, 6);
837                     consumed += 6;
838                 }
839
840                 buf_size = FFMIN(len - consumed, sizeof(buf));
841                 avio_read(pb, buf, buf_size);
842                 consumed += buf_size;
843                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
844             }
845         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
846             int stream_index = ff_find_stream_index(s, sid);
847             if (stream_index >= 0) {
848                 AVStream *st = s->streams[stream_index];
849                 int audio_type;
850                 avio_skip(pb, 8);
851                 audio_type = avio_r8(pb);
852                 if (audio_type == 2)
853                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
854                 else if (audio_type == 3)
855                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
856                 consumed += 9;
857             }
858         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
859             int stream_index = ff_find_stream_index(s, sid);
860             if (stream_index >= 0) {
861                 avio_skip(pb, 12);
862                 if (avio_rl32(pb))
863                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
864                 consumed += 16;
865             }
866         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
867             int stream_index = ff_find_stream_index(s, sid);
868             if (stream_index >= 0) {
869                 AVStream *st = s->streams[stream_index];
870                 uint8_t language[4];
871                 avio_skip(pb, 12);
872                 avio_read(pb, language, 3);
873                 if (language[0]) {
874                     language[3] = 0;
875                     av_dict_set(&st->metadata, "language", language, 0);
876                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
877                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
878                 }
879                 consumed += 15;
880             }
881         } else if (!ff_guidcmp(g, timestamp_guid)) {
882             int stream_index = ff_find_stream_index(s, sid);
883             if (stream_index >= 0) {
884                 avio_skip(pb, 8);
885                 wtv->pts = avio_rl64(pb);
886                 consumed += 16;
887                 if (wtv->pts == -1)
888                     wtv->pts = AV_NOPTS_VALUE;
889                 else {
890                     wtv->last_valid_pts = wtv->pts;
891                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
892                         wtv->epoch = wtv->pts;
893                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
894 #define WTV_PAD8(x) (((x) + 7) & ~7)
895                     avio_skip(pb, WTV_PAD8(len) - consumed);
896                     return 0;
897                 }
898                 }
899             }
900         } else if (!ff_guidcmp(g, data_guid)) {
901             int stream_index = ff_find_stream_index(s, sid);
902             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
903                 WtvStream *wst = s->streams[stream_index]->priv_data;
904                 wst->seen_data = 1;
905                 if (len_ptr) {
906                     *len_ptr = len;
907                 }
908                 return stream_index;
909             }
910         } else if (
911             !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}) ||
912             !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}) ||
913             !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}) ||
914             !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}) ||
915             !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}) ||
916             !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}) ||
917             !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}) ||
918             !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}) ||
919             !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}) ||
920             !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}) ||
921             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
922             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
923             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
924             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
925             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
926             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
927             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
928             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
929             //ignore known guids
930         } else
931             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
932
933         avio_skip(pb, WTV_PAD8(len) - consumed);
934     }
935     return AVERROR_EOF;
936 }
937
938 /* declare utf16le strings */
939 #define _ , 0,
940 static const uint8_t timeline_le16[] =
941     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
942 static const uint8_t table_0_entries_legacy_attrib_le16[] =
943     {'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};
944 static const uint8_t table_0_entries_time_le16[] =
945     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
946 static const uint8_t timeline_table_0_entries_Events_le16[] =
947     {'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};
948 #undef _
949
950 static int read_header(AVFormatContext *s)
951 {
952     WtvContext *wtv = s->priv_data;
953     int root_sector, root_size;
954     uint8_t root[WTV_SECTOR_SIZE];
955     AVIOContext *pb;
956     int64_t timeline_pos;
957     int ret;
958
959     wtv->epoch          =
960     wtv->pts            =
961     wtv->last_valid_pts = AV_NOPTS_VALUE;
962
963     /* read root directory sector */
964     avio_skip(s->pb, 0x30);
965     root_size = avio_rl32(s->pb);
966     if (root_size > sizeof(root)) {
967         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
968         return AVERROR_INVALIDDATA;
969     }
970     avio_skip(s->pb, 4);
971     root_sector = avio_rl32(s->pb);
972
973     seek_by_sector(s->pb, root_sector, 0);
974     root_size = avio_read(s->pb, root, root_size);
975     if (root_size < 0)
976         return AVERROR_INVALIDDATA;
977
978     /* parse chunks up until first data chunk */
979     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
980     if (!wtv->pb) {
981         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
982         return AVERROR_INVALIDDATA;
983     }
984
985     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
986     if (ret < 0)
987         return ret;
988     avio_seek(wtv->pb, -32, SEEK_CUR);
989
990     timeline_pos = avio_tell(s->pb); // save before opening another file
991
992     /* read metadata */
993     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
994     if (pb) {
995         parse_legacy_attrib(s, pb);
996         wtvfile_close(pb);
997     }
998
999     /* read seek index */
1000     if (s->nb_streams) {
1001         AVStream *st = s->streams[0];
1002         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1003         if (pb) {
1004             while(1) {
1005                 uint64_t timestamp = avio_rl64(pb);
1006                 uint64_t frame_nb  = avio_rl64(pb);
1007                 if (pb->eof_reached)
1008                     break;
1009                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1010                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1011             }
1012             wtvfile_close(pb);
1013
1014             if (wtv->nb_index_entries) {
1015                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1016                 if (pb) {
1017                     int i;
1018                     while (1) {
1019                         uint64_t frame_nb = avio_rl64(pb);
1020                         uint64_t position = avio_rl64(pb);
1021                         if (pb->eof_reached)
1022                             break;
1023                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1024                             AVIndexEntry *e = wtv->index_entries + i;
1025                             if (frame_nb > e->size)
1026                                 break;
1027                             if (position > e->pos)
1028                                 e->pos = position;
1029                         }
1030                     }
1031                     wtvfile_close(pb);
1032                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1033                 }
1034             }
1035         }
1036     }
1037
1038     avio_seek(s->pb, timeline_pos, SEEK_SET);
1039     return 0;
1040 }
1041
1042 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1043 {
1044     WtvContext *wtv = s->priv_data;
1045     AVIOContext *pb = wtv->pb;
1046     int stream_index, len, ret;
1047
1048     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1049     if (stream_index < 0)
1050         return stream_index;
1051
1052     ret = av_get_packet(pb, pkt, len - 32);
1053     if (ret < 0)
1054         return ret;
1055     pkt->stream_index = stream_index;
1056     pkt->pts          = wtv->pts;
1057     avio_skip(pb, WTV_PAD8(len) - len);
1058     return 0;
1059 }
1060
1061 static int read_seek(AVFormatContext *s, int stream_index,
1062                      int64_t ts, int flags)
1063 {
1064     WtvContext *wtv = s->priv_data;
1065     AVIOContext *pb = wtv->pb;
1066     AVStream *st = s->streams[0];
1067     int64_t ts_relative;
1068     int i;
1069
1070     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1071         return AVERROR(ENOSYS);
1072
1073     /* timestamp adjustment is required because wtv->pts values are absolute,
1074      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1075     ts_relative = ts;
1076     if (wtv->epoch != AV_NOPTS_VALUE)
1077         ts_relative -= wtv->epoch;
1078
1079     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1080     if (i < 0) {
1081         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1082             avio_seek(pb, 0, SEEK_SET);
1083         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1084             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1085         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1086             return AVERROR(ERANGE);
1087         return 0;
1088     }
1089     wtv->pts = wtv->index_entries[i].timestamp;
1090     if (wtv->epoch != AV_NOPTS_VALUE)
1091         wtv->pts += wtv->epoch;
1092     wtv->last_valid_pts = wtv->pts;
1093     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1094     return 0;
1095 }
1096
1097 static int read_close(AVFormatContext *s)
1098 {
1099     WtvContext *wtv = s->priv_data;
1100     av_free(wtv->index_entries);
1101     wtvfile_close(wtv->pb);
1102     return 0;
1103 }
1104
1105 AVInputFormat ff_wtv_demuxer = {
1106     .name           = "wtv",
1107     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1108     .priv_data_size = sizeof(WtvContext),
1109     .read_probe     = read_probe,
1110     .read_header    = read_header,
1111     .read_packet    = read_packet,
1112     .read_seek      = read_seek,
1113     .read_close     = read_close,
1114     .flags          = AVFMT_SHOW_IDS,
1115 };