path: root/libavformat/wtvdec.c (plain)
blob: 3ac45013066b6309eb6f812d8bcc6a2b2acfa73b

1	/*
2	* Windows Television (WTV) demuxer
3	* Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
4	*
5	* This file is part of FFmpeg.
6	*
7	* FFmpeg is free software; you can redistribute it and/or
8	* modify it under the terms of the GNU Lesser General Public
9	* License as published by the Free Software Foundation; either
10	* version 2.1 of the License, or (at your option) any later version.
11	*
12	* FFmpeg is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15	* Lesser General Public License for more details.
16	*
17	* You should have received a copy of the GNU Lesser General Public
18	* License along with FFmpeg; 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/time_internal.h"
34	#include "avformat.h"
35	#include "internal.h"
36	#include "wtv.h"
37	#include "mpegts.h"
38
39	/* Macros for formatting GUIDs */
40	#define PRI_PRETTY_GUID \
41	"%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
42	#define ARG_PRETTY_GUID(g) \
43	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]
44	#define LEN_PRETTY_GUID 34
45
46	/*
47	* File system routines
48	*/
49
50	typedef struct WtvFile {
51	AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
52
53	int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
54	uint32_t *sectors; /**< file allocation table */
55	int nb_sectors; /**< number of sectors */
56
57	int error;
58	int64_t position;
59	int64_t length;
60	} WtvFile;
61
62	static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
63	{
64	return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
65	}
66
67	/**
68	* @return bytes read, 0 on end of file, or <0 on error
69	*/
70	static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
71	{
72	WtvFile *wf = opaque;
73	AVIOContext *pb = wf->pb_filesystem;
74	int nread = 0;
75
76	if (wf->error || pb->error)
77	return -1;
78	if (wf->position >= wf->length || avio_feof(pb))
79	return 0;
80
81	buf_size = FFMIN(buf_size, wf->length - wf->position);
82	while(nread < buf_size) {
83	int n;
84	int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
85	int read_request = FFMIN(buf_size - nread, remaining_in_sector);
86
87	n = avio_read(pb, buf, read_request);
88	if (n <= 0)
89	break;
90	nread += n;
91	buf += n;
92	wf->position += n;
93	if (n == remaining_in_sector) {
94	int i = wf->position >> wf->sector_bits;
95	if (i >= wf->nb_sectors ||
96	(wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
97	seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
98	wf->error = 1;
99	break;
100	}
101	}
102	}
103	return nread;
104	}
105
106	/**
107	* @return position (or file length)
108	*/
109	static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
110	{
111	WtvFile *wf = opaque;
112	AVIOContext *pb = wf->pb_filesystem;
113
114	if (whence == AVSEEK_SIZE)
115	return wf->length;
116	else if (whence == SEEK_CUR)
117	offset = wf->position + offset;
118	else if (whence == SEEK_END)
119	offset = wf->length;
120
121	wf->error = offset < 0 || offset >= wf->length ||
122	seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
123	offset & ((1 << wf->sector_bits) - 1)) < 0;
124	wf->position = offset;
125	return offset;
126	}
127
128	/**
129	* read non-zero integers (le32) from input stream
130	* @param pb
131	* @param[out] data destination
132	* @param count maximum number of integers to read
133	* @return total number of integers read
134	*/
135	static int read_ints(AVIOContext *pb, uint32_t *data, int count)
136	{
137	int i, total = 0;
138	for (i = 0; i < count; i++) {
139	if ((data[total] = avio_rl32(pb)))
140	total++;
141	}
142	return total;
143	}
144
145	/**
146	* Open file
147	* @param first_sector First sector
148	* @param length Length of file (bytes)
149	* @param depth File allocation table depth
150	* @return NULL on error
151	*/
152	static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
153	{
154	AVIOContext *pb;
155	WtvFile *wf;
156	uint8_t *buffer;
157	int64_t size;
158
159	if (seek_by_sector(s->pb, first_sector, 0) < 0)
160	return NULL;
161
162	wf = av_mallocz(sizeof(WtvFile));
163	if (!wf)
164	return NULL;
165
166	if (depth == 0) {
167	wf->sectors = av_malloc(sizeof(uint32_t));
168	if (!wf->sectors) {
169	av_free(wf);
170	return NULL;
171	}
172	wf->sectors[0] = first_sector;
173	wf->nb_sectors = 1;
174	} else if (depth == 1) {
175	wf->sectors = av_malloc(WTV_SECTOR_SIZE);
176	if (!wf->sectors) {
177	av_free(wf);
178	return NULL;
179	}
180	wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
181	} else if (depth == 2) {
182	uint32_t sectors1[WTV_SECTOR_SIZE / 4];
183	int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
184	int i;
185
186	wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS);
187	if (!wf->sectors) {
188	av_free(wf);
189	return NULL;
190	}
191	wf->nb_sectors = 0;
192	for (i = 0; i < nb_sectors1; i++) {
193	if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
194	break;
195	wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
196	}
197	} else {
198	av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
199	av_free(wf);
200	return NULL;
201	}
202	wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
203
204	if (!wf->nb_sectors) {
205	av_freep(&wf->sectors);
206	av_freep(&wf);
207	return NULL;
208	}
209
210	size = avio_size(s->pb);
211	if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
212	av_log(s, AV_LOG_WARNING, "truncated file\n");
213
214	/* check length */
215	length &= 0xFFFFFFFFFFFF;
216	if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
217	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);
218	length = (int64_t)wf->nb_sectors << wf->sector_bits;
219	}
220	wf->length = length;
221
222	/* seek to initial sector */
223	wf->position = 0;
224	if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
225	av_freep(&wf->sectors);
226	av_freep(&wf);
227	return NULL;
228	}
229
230	wf->pb_filesystem = s->pb;
231	buffer = av_malloc(1 << wf->sector_bits);
232	if (!buffer) {
233	av_freep(&wf->sectors);
234	av_freep(&wf);
235	return NULL;
236	}
237
238	pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
239	wtvfile_read_packet, NULL, wtvfile_seek);
240	if (!pb) {
241	av_freep(&buffer);
242	av_freep(&wf->sectors);
243	av_freep(&wf);
244	}
245	return pb;
246	}
247
248	/**
249	* Open file using filename
250	* @param[in] buf directory buffer
251	* @param buf_size directory buffer size
252	* @param[in] filename
253	* @param filename_size size of filename
254	* @return NULL on error
255	*/
256	static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
257	{
258	const uint8_t *buf_end = buf + buf_size;
259
260	while(buf + 48 <= buf_end) {
261	int dir_length, name_size, first_sector, depth;
262	uint64_t file_length;
263	const uint8_t *name;
264	if (ff_guidcmp(buf, ff_dir_entry_guid)) {
265	av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
266	"remaining directory entries ignored\n", FF_ARG_GUID(buf));
267	break;
268	}
269	dir_length = AV_RL16(buf + 16);
270	file_length = AV_RL64(buf + 24);
271	name_size = 2 * AV_RL32(buf + 32);
272	if (name_size < 0) {
273	av_log(s, AV_LOG_ERROR,
274	"bad filename length, remaining directory entries ignored\n");
275	break;
276	}
277	if (48 + (int64_t)name_size > buf_end - buf) {
278	av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
279	break;
280	}
281	first_sector = AV_RL32(buf + 40 + name_size);
282	depth = AV_RL32(buf + 44 + name_size);
283
284	/* compare file name; test optional null terminator */
285	name = buf + 40;
286	if (name_size >= filename_size &&
287	!memcmp(name, filename, filename_size) &&
288	(name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
289	return wtvfile_open_sector(first_sector, file_length, depth, s);
290
291	buf += dir_length;
292	}
293	return 0;
294	}
295
296	#define wtvfile_open(s, buf, buf_size, filename) \
297	wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
298
299	/**
300	* Close file opened with wtvfile_open_sector(), or wtv_open()
301	*/
302	static void wtvfile_close(AVIOContext *pb)
303	{
304	WtvFile *wf = pb->opaque;
305	av_freep(&wf->sectors);
306	av_freep(&pb->opaque);
307	av_freep(&pb->buffer);
308	av_free(pb);
309	}
310
311	/*
312	* Main demuxer
313	*/
314
315	typedef struct WtvStream {
316	int seen_data;
317	} WtvStream;
318
319	typedef struct WtvContext {
320	AVIOContext *pb; /**< timeline file */
321	int64_t epoch;
322	int64_t pts; /**< pts for next data chunk */
323	int64_t last_valid_pts; /**< latest valid pts, used for interactive seeking */
324
325	/* maintain private seek index, as the AVIndexEntry->pos is relative to the
326	start of the 'timeline' file, not the file system (AVFormatContext->pb) */
327	AVIndexEntry *index_entries;
328	int nb_index_entries;
329	unsigned int index_entries_allocated_size;
330	} WtvContext;
331
332	/* WTV GUIDs */
333	static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
334	{0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
335	static const ff_asf_guid EVENTID_LanguageSpanningEvent =
336	{0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
337	static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
338	{0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
339	static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
340	{0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
341	static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
342	{0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
343	static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
344	{0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
345	static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
346	{0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
347	static const ff_asf_guid EVENTID_TeletextSpanningEvent =
348	{0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
349	static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
350	{0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
351
352	/* Windows media GUIDs */
353
354	/* Media types */
355	static const ff_asf_guid mediasubtype_mpeg1payload =
356	{0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
357	static const ff_asf_guid mediatype_mpeg2_sections =
358	{0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
359	static const ff_asf_guid mediatype_mpeg2_pes =
360	{0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
361	static const ff_asf_guid mediatype_mstvcaption =
362	{0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
363
364	/* Media subtypes */
365	static const ff_asf_guid mediasubtype_dvb_subtitle =
366	{0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
367	static const ff_asf_guid mediasubtype_teletext =
368	{0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
369	static const ff_asf_guid mediasubtype_dtvccdata =
370	{0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
371	static const ff_asf_guid mediasubtype_mpeg2_sections =
372	{0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
373
374	static int read_probe(AVProbeData *p)
375	{
376	return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
377	}
378
379	/**
380	* Convert win32 FILETIME to ISO-8601 string
381	* @return <0 on error
382	*/
383	static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
384	{
385	time_t t = (value / 10000000LL) - 11644473600LL;
386	struct tm tmbuf;
387	struct tm *tm = gmtime_r(&t, &tmbuf);
388	if (!tm)
389	return -1;
390	if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
391	return -1;
392	return 0;
393	}
394
395	/**
396	* Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
397	* @return <0 on error
398	*/
399	static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
400	{
401	time_t t = (value / 10000000LL) - 719162LL*86400LL;
402	struct tm tmbuf;
403	struct tm *tm = gmtime_r(&t, &tmbuf);
404	if (!tm)
405	return -1;
406	if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
407	return -1;
408	return 0;
409	}
410
411	/**
412	* Convert OLE DATE to ISO-8601 string
413	* @return <0 on error
414	*/
415	static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
416	{
417	time_t t = (av_int2double(value) - 25569.0) * 86400;
418	struct tm tmbuf;
419	struct tm *tm= gmtime_r(&t, &tmbuf);
420	if (!tm)
421	return -1;
422	if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
423	return -1;
424	return 0;
425	}
426
427	static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
428	{
429	char mime[1024];
430	char description[1024];
431	unsigned int filesize;
432	AVStream *st;
433	int ret;
434	int64_t pos = avio_tell(pb);
435
436	avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
437	if (strcmp(mime, "image/jpeg"))
438	goto done;
439
440	avio_r8(pb);
441	avio_get_str16le(pb, INT_MAX, description, sizeof(description));
442	filesize = avio_rl32(pb);
443	if (!filesize)
444	goto done;
445
446	st = avformat_new_stream(s, NULL);
447	if (!st)
448	goto done;
449	av_dict_set(&st->metadata, "title", description, 0);
450	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
451	st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
452	st->id = -1;
453	ret = av_get_packet(pb, &st->attached_pic, filesize);
454	if (ret < 0)
455	goto done;
456	st->attached_pic.stream_index = st->index;
457	st->attached_pic.flags |= AV_PKT_FLAG_KEY;
458	st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
459	done:
460	avio_seek(pb, pos + length, SEEK_SET);
461	}
462
463	static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
464	{
465	int buf_size;
466	char *buf;
467
468	if (!strcmp(key, "WM/MediaThumbType")) {
469	avio_skip(pb, length);
470	return;
471	}
472
473	buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
474	buf = av_malloc(buf_size);
475	if (!buf)
476	return;
477
478	if (type == 0 && length == 4) {
479	snprintf(buf, buf_size, "%u", avio_rl32(pb));
480	} else if (type == 1) {
481	avio_get_str16le(pb, length, buf, buf_size);
482	if (!strlen(buf)) {
483	av_free(buf);
484	return;
485	}
486	} else if (type == 3 && length == 4) {
487	strcpy(buf, avio_rl32(pb) ? "true" : "false");
488	} else if (type == 4 && length == 8) {
489	int64_t num = avio_rl64(pb);
490	if (!strcmp(key, "WM/EncodingTime") ||
491	!strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
492	if (filetime_to_iso8601(buf, buf_size, num) < 0) {
493	av_free(buf);
494	return;
495	}
496	} else if (!strcmp(key, "WM/WMRVEncodeTime") ||
497	!strcmp(key, "WM/WMRVEndTime")) {
498	if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
499	av_free(buf);
500	return;
501	}
502	} else if (!strcmp(key, "WM/WMRVExpirationDate")) {
503	if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
504	av_free(buf);
505	return;
506	}
507	} else if (!strcmp(key, "WM/WMRVBitrate"))
508	snprintf(buf, buf_size, "%f", av_int2double(num));
509	else
510	snprintf(buf, buf_size, "%"PRIi64, num);
511	} else if (type == 5 && length == 2) {
512	snprintf(buf, buf_size, "%u", avio_rl16(pb));
513	} else if (type == 6 && length == 16) {
514	ff_asf_guid guid;
515	avio_read(pb, guid, 16);
516	snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
517	} else if (type == 2 && !strcmp(key, "WM/Picture")) {
518	get_attachment(s, pb, length);
519	av_freep(&buf);
520	return;
521	} else {
522	av_freep(&buf);
523	av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
524	avio_skip(pb, length);
525	return;
526	}
527
528	av_dict_set(&s->metadata, key, buf, 0);
529	av_freep(&buf);
530	}
531
532	/**
533	* Parse metadata entries
534	*/
535	static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
536	{
537	ff_asf_guid guid;
538	int length, type;
539	while(!avio_feof(pb)) {
540	char key[1024];
541	ff_get_guid(pb, &guid);
542	type = avio_rl32(pb);
543	length = avio_rl32(pb);
544	if (!length)
545	break;
546	if (ff_guidcmp(&guid, ff_metadata_guid)) {
547	av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
548	"remaining metadata entries ignored\n", FF_ARG_GUID(guid));
549	break;
550	}
551	avio_get_str16le(pb, INT_MAX, key, sizeof(key));
552	get_tag(s, pb, key, type, length);
553	}
554
555	ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
556	}
557
558	/**
559	* parse VIDEOINFOHEADER2 structure
560	* @return bytes consumed
561	*/
562	static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
563	{
564	WtvContext *wtv = s->priv_data;
565	AVIOContext *pb = wtv->pb;
566
567	avio_skip(pb, 72); // picture aspect ratio is unreliable
568	st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL);
569
570	return 72 + 40;
571	}
572
573	/**
574	* Parse MPEG1WAVEFORMATEX extradata structure
575	*/
576	static void parse_mpeg1waveformatex(AVStream *st)
577	{
578	/* fwHeadLayer */
579	switch (AV_RL16(st->codecpar->extradata)) {
580	case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
581	case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
582	case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
583	}
584
585	st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
586
587	/* dwHeadMode */
588	switch (AV_RL16(st->codecpar->extradata + 6)) {
589	case 1 :
590	case 2 :
591	case 4 : st->codecpar->channels = 2;
592	st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
593	break;
594	case 8 : st->codecpar->channels = 1;
595	st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
596	break;
597	}
598	}
599
600	/**
601	* Initialise stream
602	* @param st Stream to initialise, or NULL to create and initialise new stream
603	* @return NULL on error
604	*/
605	static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
606	{
607	if (st) {
608	if (st->codecpar->extradata) {
609	av_freep(&st->codecpar->extradata);
610	st->codecpar->extradata_size = 0;
611	}
612	} else {
613	WtvStream *wst = av_mallocz(sizeof(WtvStream));
614	if (!wst)
615	return NULL;
616	st = avformat_new_stream(s, NULL);
617	if (!st) {
618	av_free(wst);
619	return NULL;
620	}
621	st->id = sid;
622	st->priv_data = wst;
623	}
624	st->codecpar->codec_type = codec_type;
625	st->need_parsing = AVSTREAM_PARSE_FULL;
626	avpriv_set_pts_info(st, 64, 1, 10000000);
627	return st;
628	}
629
630	/**
631	* parse Media Type structure and populate stream
632	* @param st Stream, or NULL to create new stream
633	* @param mediatype Mediatype GUID
634	* @param subtype Subtype GUID
635	* @param formattype Format GUID
636	* @param size Size of format buffer
637	* @return NULL on error
638	*/
639	static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
640	ff_asf_guid mediatype, ff_asf_guid subtype,
641	ff_asf_guid formattype, uint64_t size)
642	{
643	WtvContext *wtv = s->priv_data;
644	AVIOContext *pb = wtv->pb;
645	if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
646	!ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
647	ff_asf_guid actual_subtype;
648	ff_asf_guid actual_formattype;
649
650	if (size < 32) {
651	av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
652	avio_skip(pb, size);
653	return NULL;
654	}
655
656	avio_skip(pb, size - 32);
657	ff_get_guid(pb, &actual_subtype);
658	ff_get_guid(pb, &actual_formattype);
659	avio_seek(pb, -size, SEEK_CUR);
660
661	st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
662	avio_skip(pb, 32);
663	return st;
664	} else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
665	st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
666	if (!st)
667	return NULL;
668	if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
669	int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
670	if (ret < 0)
671	return NULL;
672	} else {
673	if (ff_guidcmp(formattype, ff_format_none))
674	av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
675	avio_skip(pb, size);
676	}
677
678	if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
679	st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
680	} else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
681	if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
682	parse_mpeg1waveformatex(st);
683	else
684	av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
685	} else {
686	st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
687	if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
688	av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
689	}
690	return st;
691	} else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
692	st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
693	if (!st)
694	return NULL;
695	if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
696	int consumed = parse_videoinfoheader2(s, st);
697	avio_skip(pb, FFMAX(size - consumed, 0));
698	} else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
699	uint64_t consumed = parse_videoinfoheader2(s, st);
700	/* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
701	avio_skip(pb, FFMAX(size - consumed, 0));
702	} else {
703	if (ff_guidcmp(formattype, ff_format_none))
704	av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
705	avio_skip(pb, size);
706	}
707
708	if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
709	st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
710	} else {
711	st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
712	}
713	if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
714	av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
715	return st;
716	} else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
717	!ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
718	st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
719	if (!st)
720	return NULL;
721	if (ff_guidcmp(formattype, ff_format_none))
722	av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
723	avio_skip(pb, size);
724	st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
725	return st;
726	} else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
727	(!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
728	st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
729	if (!st)
730	return NULL;
731	if (ff_guidcmp(formattype, ff_format_none))
732	av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
733	avio_skip(pb, size);
734	st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
735	return st;
736	} else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
737	!ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
738	if (ff_guidcmp(formattype, ff_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	return NULL;
742	}
743
744	av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
745	", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
746	FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
747	avio_skip(pb, size);
748	return NULL;
749	}
750
751	enum {
752	SEEK_TO_DATA = 0,
753	SEEK_TO_PTS,
754	};
755
756	/**
757	* Try to seek over a broken chunk
758	* @return <0 on error
759	*/
760	static int recover(WtvContext *wtv, uint64_t broken_pos)
761	{
762	AVIOContext *pb = wtv->pb;
763	int i;
764	for (i = 0; i < wtv->nb_index_entries; i++) {
765	if (wtv->index_entries[i].pos > broken_pos) {
766	int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
767	if (ret < 0)
768	return ret;
769	wtv->pts = wtv->index_entries[i].timestamp;
770	return 0;
771	}
772	}
773	return AVERROR(EIO);
774	}
775
776	/**
777	* Parse WTV chunks
778	* @param mode SEEK_TO_DATA or SEEK_TO_PTS
779	* @param seekts timestamp
780	* @param[out] len_ptr Length of data chunk
781	* @return stream index of data chunk, or <0 on error
782	*/
783	static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
784	{
785	WtvContext *wtv = s->priv_data;
786	AVIOContext *pb = wtv->pb;
787	while (!avio_feof(pb)) {
788	ff_asf_guid g;
789	int len, sid, consumed;
790
791	ff_get_guid(pb, &g);
792	len = avio_rl32(pb);
793	if (len < 32) {
794	int ret;
795	if (avio_feof(pb))
796	return AVERROR_EOF;
797	av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
798	if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
799	return ret;
800	continue;
801	}
802	sid = avio_rl32(pb) & 0x7FFF;
803	avio_skip(pb, 8);
804	consumed = 32;
805
806	if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
807	if (ff_find_stream_index(s, sid) < 0) {
808	ff_asf_guid mediatype, subtype, formattype;
809	int size;
810	avio_skip(pb, 28);
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, 0, sid, mediatype, subtype, formattype, size);
817	consumed += 92 + size;
818	}
819	} else if (!ff_guidcmp(g, ff_stream2_guid)) {
820	int stream_index = ff_find_stream_index(s, sid);
821	if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
822	ff_asf_guid mediatype, subtype, formattype;
823	int size;
824	avio_skip(pb, 12);
825	ff_get_guid(pb, &mediatype);
826	ff_get_guid(pb, &subtype);
827	avio_skip(pb, 12);
828	ff_get_guid(pb, &formattype);
829	size = avio_rl32(pb);
830	parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
831	consumed += 76 + size;
832	}
833	} else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
834	!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
835	!ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
836	!ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
837	!ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
838	!ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
839	int stream_index = ff_find_stream_index(s, sid);
840	if (stream_index >= 0) {
841	AVStream *st = s->streams[stream_index];
842	uint8_t buf[258];
843	const uint8_t *pbuf = buf;
844	int buf_size;
845
846	avio_skip(pb, 8);
847	consumed += 8;
848	if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
849	!ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
850	avio_skip(pb, 6);
851	consumed += 6;
852	}
853
854	buf_size = FFMIN(len - consumed, sizeof(buf));
855	avio_read(pb, buf, buf_size);
856	consumed += buf_size;
857	ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
858	}
859	} else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
860	int stream_index = ff_find_stream_index(s, sid);
861	if (stream_index >= 0) {
862	AVStream *st = s->streams[stream_index];
863	int audio_type;
864	avio_skip(pb, 8);
865	audio_type = avio_r8(pb);
866	if (audio_type == 2)
867	st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
868	else if (audio_type == 3)
869	st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
870	consumed += 9;
871	}
872	} else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
873	int stream_index = ff_find_stream_index(s, sid);
874	if (stream_index >= 0) {
875	avio_skip(pb, 12);
876	if (avio_rl32(pb))
877	av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
878	consumed += 16;
879	}
880	} else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
881	int stream_index = ff_find_stream_index(s, sid);
882	if (stream_index >= 0) {
883	AVStream *st = s->streams[stream_index];
884	uint8_t language[4];
885	avio_skip(pb, 12);
886	avio_read(pb, language, 3);
887	if (language[0]) {
888	language[3] = 0;
889	av_dict_set(&st->metadata, "language", language, 0);
890	if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
891	st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
892	}
893	consumed += 15;
894	}
895	} else if (!ff_guidcmp(g, ff_timestamp_guid)) {
896	int stream_index = ff_find_stream_index(s, sid);
897	if (stream_index >= 0) {
898	avio_skip(pb, 8);
899	wtv->pts = avio_rl64(pb);
900	consumed += 16;
901	if (wtv->pts == -1)
902	wtv->pts = AV_NOPTS_VALUE;
903	else {
904	wtv->last_valid_pts = wtv->pts;
905	if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
906	wtv->epoch = wtv->pts;
907	if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
908	avio_skip(pb, WTV_PAD8(len) - consumed);
909	return 0;
910	}
911	}
912	}
913	} else if (!ff_guidcmp(g, ff_data_guid)) {
914	int stream_index = ff_find_stream_index(s, sid);
915	if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
916	WtvStream *wst = s->streams[stream_index]->priv_data;
917	wst->seen_data = 1;
918	if (len_ptr) {
919	*len_ptr = len;
920	}
921	return stream_index;
922	}
923	} else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
924	int stream_index = ff_find_stream_index(s, sid);
925	if (stream_index >= 0)
926	av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
927	} else if (
928	!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}) ||
929	!ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
930	!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}) ||
931	!ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
932	!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}) ||
933	!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}) ||
934	!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}) ||
935	!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}) ||
936	!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}) ||
937	!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}) ||
938	!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}) ||
939	!ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
940	!ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
941	!ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
942	!ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
943	!ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
944	!ff_guidcmp(g, ff_index_guid) ||
945	!ff_guidcmp(g, ff_sync_guid) ||
946	!ff_guidcmp(g, ff_stream1_guid) ||
947	!ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
948	//ignore known guids
949	} else
950	av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
951
952	avio_skip(pb, WTV_PAD8(len) - consumed);
953	}
954	return AVERROR_EOF;
955	}
956
957	static int read_header(AVFormatContext *s)
958	{
959	WtvContext *wtv = s->priv_data;
960	int root_sector, root_size;
961	uint8_t root[WTV_SECTOR_SIZE];
962	AVIOContext *pb;
963	int64_t timeline_pos;
964	int64_t ret;
965
966	wtv->epoch =
967	wtv->pts =
968	wtv->last_valid_pts = AV_NOPTS_VALUE;
969
970	/* read root directory sector */
971	avio_skip(s->pb, 0x30);
972	root_size = avio_rl32(s->pb);
973	if (root_size > sizeof(root)) {
974	av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
975	return AVERROR_INVALIDDATA;
976	}
977	avio_skip(s->pb, 4);
978	root_sector = avio_rl32(s->pb);
979
980	ret = seek_by_sector(s->pb, root_sector, 0);
981	if (ret < 0)
982	return ret;
983	root_size = avio_read(s->pb, root, root_size);
984	if (root_size < 0)
985	return AVERROR_INVALIDDATA;
986
987	/* parse chunks up until first data chunk */
988	wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
989	if (!wtv->pb) {
990	av_log(s, AV_LOG_ERROR, "timeline data missing\n");
991	return AVERROR_INVALIDDATA;
992	}
993
994	ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
995	if (ret < 0)
996	return ret;
997	avio_seek(wtv->pb, -32, SEEK_CUR);
998
999	timeline_pos = avio_tell(s->pb); // save before opening another file
1000
1001	/* read metadata */
1002	pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
1003	if (pb) {
1004	parse_legacy_attrib(s, pb);
1005	wtvfile_close(pb);
1006	}
1007
1008	s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv
1009
1010	/* read seek index */
1011	if (s->nb_streams) {
1012	AVStream *st = s->streams[0];
1013	pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
1014	if (pb) {
1015	while(1) {
1016	uint64_t timestamp = avio_rl64(pb);
1017	uint64_t frame_nb = avio_rl64(pb);
1018	if (avio_feof(pb))
1019	break;
1020	ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1021	0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1022	}
1023	wtvfile_close(pb);
1024
1025	if (wtv->nb_index_entries) {
1026	pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
1027	if (pb) {
1028	AVIndexEntry *e = wtv->index_entries;
1029	AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1;
1030	uint64_t last_position = 0;
1031	while (1) {
1032	uint64_t frame_nb = avio_rl64(pb);
1033	uint64_t position = avio_rl64(pb);
1034	while (e <= e_end && frame_nb > e->size) {
1035	e->pos = last_position;
1036	e++;
1037	}
1038	if (avio_feof(pb))
1039	break;
1040	last_position = position;
1041	}
1042	e_end->pos = last_position;
1043	wtvfile_close(pb);
1044	st->duration = e_end->timestamp;
1045	}
1046	}
1047	}
1048	}
1049
1050	avio_seek(s->pb, timeline_pos, SEEK_SET);
1051	return 0;
1052	}
1053
1054	static int read_packet(AVFormatContext *s, AVPacket *pkt)
1055	{
1056	WtvContext *wtv = s->priv_data;
1057	AVIOContext *pb = wtv->pb;
1058	int stream_index, len, ret;
1059
1060	stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1061	if (stream_index < 0)
1062	return stream_index;
1063
1064	ret = av_get_packet(pb, pkt, len - 32);
1065	if (ret < 0)
1066	return ret;
1067	pkt->stream_index = stream_index;
1068	pkt->pts = wtv->pts;
1069	avio_skip(pb, WTV_PAD8(len) - len);
1070	return 0;
1071	}
1072
1073	static int read_seek(AVFormatContext *s, int stream_index,
1074	int64_t ts, int flags)
1075	{
1076	WtvContext *wtv = s->priv_data;
1077	AVIOContext *pb = wtv->pb;
1078	AVStream *st = s->streams[0];
1079	int64_t ts_relative;
1080	int i;
1081
1082	if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1083	return AVERROR(ENOSYS);
1084
1085	/* timestamp adjustment is required because wtv->pts values are absolute,
1086	* whereas AVIndexEntry->timestamp values are relative to epoch. */
1087	ts_relative = ts;
1088	if (wtv->epoch != AV_NOPTS_VALUE)
1089	ts_relative -= wtv->epoch;
1090
1091	i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1092	if (i < 0) {
1093	if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1094	if (avio_seek(pb, 0, SEEK_SET) < 0)
1095	return -1;
1096	} else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1097	if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1098	return -1;
1099	}
1100	if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1101	return AVERROR(ERANGE);
1102	return 0;
1103	}
1104	if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1105	return -1;
1106	wtv->pts = wtv->index_entries[i].timestamp;
1107	if (wtv->epoch != AV_NOPTS_VALUE)
1108	wtv->pts += wtv->epoch;
1109	wtv->last_valid_pts = wtv->pts;
1110	return 0;
1111	}
1112
1113	static int read_close(AVFormatContext *s)
1114	{
1115	WtvContext *wtv = s->priv_data;
1116	av_freep(&wtv->index_entries);
1117	wtvfile_close(wtv->pb);
1118	return 0;
1119	}
1120
1121	AVInputFormat ff_wtv_demuxer = {
1122	.name = "wtv",
1123	.long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1124	.priv_data_size = sizeof(WtvContext),
1125	.read_probe = read_probe,
1126	.read_header = read_header,
1127	.read_packet = read_packet,
1128	.read_seek = read_seek,
1129	.read_close = read_close,
1130	.flags = AVFMT_SHOW_IDS,
1131	};
1132