2 * Windows Television (WTV) demuxer
3 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Windows Television (WTV) demuxer
25 * @author Peter Ross <pross@xvid.org>
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/intfloat.h"
35 /* Macros for formating GUIDs */
36 #define PRI_PRETTY_GUID \
37 "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
38 #define ARG_PRETTY_GUID(g) \
39 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]
40 #define LEN_PRETTY_GUID 34
44 * File system routines
49 AVIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
51 int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
52 uint32_t *sectors; /** file allocation table */
53 int nb_sectors; /** number of sectors */
61 * @return bytes read, 0 on end of file, or <0 on error
63 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
66 AVIOContext *pb = wf->pb_filesystem;
69 if (wf->error || pb->error)
71 if (wf->position >= wf->length || url_feof(pb))
74 buf_size = FFMIN(buf_size, wf->length - wf->position);
75 while(nread < buf_size) {
77 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
78 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
80 n = avio_read(pb, buf, read_request);
86 if (n == remaining_in_sector) {
87 int i = wf->position >> wf->sector_bits;
88 if (i >= wf->nb_sectors ||
89 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
90 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
100 * @return position (or file length)
102 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
104 WtvFile *wf = opaque;
105 AVIOContext *pb = wf->pb_filesystem;
107 if (whence == AVSEEK_SIZE)
109 else if (whence == SEEK_CUR)
110 offset = wf->position + offset;
111 else if (whence == SEEK_END)
114 wf->error = offset < 0 || offset >= wf->length ||
115 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
116 + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
117 wf->position = offset;
122 * read non-zero integers (le32) from input stream
124 * @param[out] data destination
125 * @param count maximum number of integers to read
126 * @return total number of integers read
128 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
131 for (i = 0; i < count; i++) {
132 if ((data[total] = avio_rl32(pb)))
140 * @param first_sector First sector
141 * @param length Length of file (bytes)
142 * @param depth File allocation table depth
143 * @return NULL on error
145 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
151 if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
154 wf = av_mallocz(sizeof(WtvFile));
159 wf->sectors = av_malloc(sizeof(uint32_t));
164 wf->sectors[0] = first_sector;
166 } else if (depth == 1) {
167 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
172 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
173 } else if (depth == 2) {
174 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
175 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
178 wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
184 for (i = 0; i < nb_sectors1; i++) {
185 if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
187 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
190 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
194 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
196 if (!wf->nb_sectors) {
197 av_free(wf->sectors);
203 length &= 0xFFFFFFFFFFFF;
204 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
205 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);
206 length = (int64_t)wf->nb_sectors << wf->sector_bits;
210 /* seek to initial sector */
212 if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
213 av_free(wf->sectors);
218 wf->pb_filesystem = s->pb;
219 buffer = av_malloc(1 << wf->sector_bits);
221 av_free(wf->sectors);
226 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
227 wtvfile_read_packet, NULL, wtvfile_seek);
230 av_free(wf->sectors);
237 * Open file using filename
238 * @param[in] buf directory buffer
239 * @param buf_size directory buffer size
240 * @param[in] filename
241 * @param filename_size size of filename
242 * @return NULL on error
244 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
246 const uint8_t *buf_end = buf + buf_size;
248 while(buf + 48 <= buf_end) {
249 int dir_length, name_size, first_sector, depth;
250 uint64_t file_length;
252 if (ff_guidcmp(buf, ff_dir_entry_guid)) {
253 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
254 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
257 dir_length = AV_RL16(buf + 16);
258 file_length = AV_RL64(buf + 24);
259 name_size = 2 * AV_RL32(buf + 32);
260 if (buf + 48 + (int64_t)name_size > buf_end || name_size<0) {
261 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
264 first_sector = AV_RL32(buf + 40 + name_size);
265 depth = AV_RL32(buf + 44 + name_size);
267 /* compare file name; test optional null terminator */
269 if (name_size >= filename_size &&
270 !memcmp(name, filename, filename_size) &&
271 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
272 return wtvfile_open_sector(first_sector, file_length, depth, s);
279 #define wtvfile_open(s, buf, buf_size, filename) \
280 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
283 * Close file opened with wtvfile_open_sector(), or wtv_open()
285 static void wtvfile_close(AVIOContext *pb)
287 WtvFile *wf = pb->opaque;
288 av_free(wf->sectors);
289 av_freep(&pb->opaque);
290 av_freep(&pb->buffer);
305 AVIOContext *pb; /** timeline file */
307 int64_t pts; /** pts for next data chunk */
308 int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
310 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
311 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
312 AVIndexEntry *index_entries;
313 int nb_index_entries;
314 unsigned int index_entries_allocated_size;
318 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
319 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
320 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
321 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
322 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
323 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
324 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
325 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
326 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
327 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
328 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
329 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
330 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
331 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
332 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
333 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
334 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
335 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
337 /* Windows media GUIDs */
340 static const ff_asf_guid mediasubtype_mpeg1payload =
341 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
342 static const ff_asf_guid mediatype_mpeg2_sections =
343 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
344 static const ff_asf_guid mediatype_mpeg2_pes =
345 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
346 static const ff_asf_guid mediatype_mstvcaption =
347 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
350 static const ff_asf_guid mediasubtype_dvb_subtitle =
351 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
352 static const ff_asf_guid mediasubtype_teletext =
353 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
354 static const ff_asf_guid mediasubtype_dtvccdata =
355 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
356 static const ff_asf_guid mediasubtype_mpeg2_sections =
357 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
360 static const ff_asf_guid format_videoinfo2 =
361 {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
363 static int read_probe(AVProbeData *p)
365 return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
369 * Convert win32 FILETIME to ISO-8601 string
370 * @return <0 on error
372 static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
374 time_t t = (value / 10000000LL) - 11644473600LL;
375 struct tm *tm = gmtime(&t);
378 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
383 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
384 * @return <0 on error
386 static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
388 time_t t = (value / 10000000LL) - 719162LL*86400LL;
389 struct tm *tm = gmtime(&t);
392 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
397 * Convert OLE DATE to ISO-8601 string
398 * @return <0 on error
400 static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
402 time_t t = (av_int2double(value) - 25569.0) * 86400;
403 struct tm *result= gmtime(&t);
406 strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", result);
410 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
413 char description[1024];
414 unsigned int filesize;
416 int64_t pos = avio_tell(pb);
418 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
419 if (strcmp(mime, "image/jpeg"))
423 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
424 filesize = avio_rl32(pb);
428 st = avformat_new_stream(s, NULL);
431 av_dict_set(&st->metadata, "title", description, 0);
432 st->codec->codec_id = AV_CODEC_ID_MJPEG;
433 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
434 st->codec->extradata = av_mallocz(filesize);
435 if (!st->codec->extradata)
437 st->codec->extradata_size = filesize;
438 avio_read(pb, st->codec->extradata, filesize);
440 avio_seek(pb, pos + length, SEEK_SET);
443 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
445 int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
446 char *buf = av_malloc(buf_size);
450 if (type == 0 && length == 4) {
451 snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
452 } else if (type == 1) {
453 avio_get_str16le(pb, length, buf, buf_size);
458 } else if (type == 3 && length == 4) {
459 strcpy(buf, avio_rl32(pb) ? "true" : "false");
460 } else if (type == 4 && length == 8) {
461 int64_t num = avio_rl64(pb);
462 if (!strcmp(key, "WM/EncodingTime") ||
463 !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
464 if (filetime_to_iso8601(buf, buf_size, num) < 0) {
468 } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
469 !strcmp(key, "WM/WMRVEndTime")) {
470 if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
474 } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
475 if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
479 } else if (!strcmp(key, "WM/WMRVBitrate"))
480 snprintf(buf, buf_size, "%f", av_int2double(num));
482 snprintf(buf, buf_size, "%"PRIi64, num);
483 } else if (type == 5 && length == 2) {
484 snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
485 } else if (type == 6 && length == 16) {
487 avio_read(pb, guid, 16);
488 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
489 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
490 get_attachment(s, pb, length);
495 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
496 avio_skip(pb, length);
500 av_dict_set(&s->metadata, key, buf, 0);
505 * Parse metadata entries
507 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
511 while(!url_feof(pb)) {
513 ff_get_guid(pb, &guid);
514 type = avio_rl32(pb);
515 length = avio_rl32(pb);
518 if (ff_guidcmp(&guid, ff_metadata_guid)) {
519 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
520 "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
523 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
524 get_tag(s, pb, key, type, length);
527 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
531 * parse VIDEOINFOHEADER2 structure
532 * @return bytes consumed
534 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
536 WtvContext *wtv = s->priv_data;
537 AVIOContext *pb = wtv->pb;
539 avio_skip(pb, 72); // picture aspect ratio is unreliable
540 ff_get_bmp_header(pb, st, NULL);
546 * Parse MPEG1WAVEFORMATEX extradata structure
548 static void parse_mpeg1waveformatex(AVStream *st)
551 switch (AV_RL16(st->codec->extradata)) {
552 case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
553 case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
554 case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
557 st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
560 switch (AV_RL16(st->codec->extradata + 6)) {
561 case 1 : case 2 : case 4 : st->codec->channels = 2; break;
562 case 8 : st->codec->channels = 1; break;
568 * @param st Stream to initialise, or NULL to create and initialise new stream
569 * @return NULL on error
571 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
574 if (st->codec->extradata) {
575 av_freep(&st->codec->extradata);
576 st->codec->extradata_size = 0;
579 WtvStream *wst = av_mallocz(sizeof(WtvStream));
582 st = avformat_new_stream(s, NULL);
588 st->codec->codec_type = codec_type;
589 st->need_parsing = AVSTREAM_PARSE_FULL;
590 avpriv_set_pts_info(st, 64, 1, 10000000);
595 * parse Media Type structure and populate stream
596 * @param st Stream, or NULL to create new stream
597 * @param mediatype Mediatype GUID
598 * @param subtype Subtype GUID
599 * @param formattype Format GUID
600 * @param size Size of format buffer
601 * @return NULL on error
603 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
604 ff_asf_guid mediatype, ff_asf_guid subtype,
605 ff_asf_guid formattype, int size)
607 WtvContext *wtv = s->priv_data;
608 AVIOContext *pb = wtv->pb;
609 if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
610 !ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
611 ff_asf_guid actual_subtype;
612 ff_asf_guid actual_formattype;
615 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
620 avio_skip(pb, size - 32);
621 ff_get_guid(pb, &actual_subtype);
622 ff_get_guid(pb, &actual_formattype);
623 avio_seek(pb, -size, SEEK_CUR);
625 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
628 } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
629 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
632 if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
633 int ret = ff_get_wav_header(pb, st->codec, size);
637 if (ff_guidcmp(formattype, ff_format_none))
638 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
642 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
643 st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
644 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
645 if (st->codec->extradata && st->codec->extradata_size >= 22)
646 parse_mpeg1waveformatex(st);
648 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
650 st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
651 if (st->codec->codec_id == AV_CODEC_ID_NONE)
652 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
655 } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
656 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
659 if (!ff_guidcmp(formattype, format_videoinfo2)) {
660 int consumed = parse_videoinfoheader2(s, st);
661 avio_skip(pb, FFMAX(size - consumed, 0));
662 } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
663 int consumed = parse_videoinfoheader2(s, st);
664 avio_skip(pb, FFMAX(size - consumed, 0));
666 if (ff_guidcmp(formattype, ff_format_none))
667 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
671 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
672 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
674 st->codec->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
676 if (st->codec->codec_id == AV_CODEC_ID_NONE)
677 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
679 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
680 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
681 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
684 if (ff_guidcmp(formattype, ff_format_none))
685 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
687 st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
689 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
690 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
691 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
694 if (ff_guidcmp(formattype, ff_format_none))
695 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
697 st->codec->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
699 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
700 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
701 if (ff_guidcmp(formattype, ff_format_none))
702 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
707 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
708 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
709 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
721 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
722 * @param seekts timestamp
723 * @param[out] len_ptr Length of data chunk
724 * @return stream index of data chunk, or <0 on error
726 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
728 WtvContext *wtv = s->priv_data;
729 AVIOContext *pb = wtv->pb;
730 while (!url_feof(pb)) {
732 int len, sid, consumed;
738 sid = avio_rl32(pb) & 0x7FFF;
742 if (!ff_guidcmp(g, ff_stream_guid)) {
743 if (ff_find_stream_index(s, sid) < 0) {
744 ff_asf_guid mediatype, subtype, formattype;
747 ff_get_guid(pb, &mediatype);
748 ff_get_guid(pb, &subtype);
750 ff_get_guid(pb, &formattype);
751 size = avio_rl32(pb);
752 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
753 consumed += 92 + size;
755 } else if (!ff_guidcmp(g, ff_stream2_guid)) {
756 int stream_index = ff_find_stream_index(s, sid);
757 if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
758 ff_asf_guid mediatype, subtype, formattype;
761 ff_get_guid(pb, &mediatype);
762 ff_get_guid(pb, &subtype);
764 ff_get_guid(pb, &formattype);
765 size = avio_rl32(pb);
766 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
767 consumed += 76 + size;
769 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
770 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
771 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
772 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
773 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
774 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
775 int stream_index = ff_find_stream_index(s, sid);
776 if (stream_index >= 0) {
777 AVStream *st = s->streams[stream_index];
779 const uint8_t *pbuf = buf;
784 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
785 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
790 buf_size = FFMIN(len - consumed, sizeof(buf));
791 avio_read(pb, buf, buf_size);
792 consumed += buf_size;
793 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
795 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
796 int stream_index = ff_find_stream_index(s, sid);
797 if (stream_index >= 0) {
798 AVStream *st = s->streams[stream_index];
801 audio_type = avio_r8(pb);
803 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
804 else if (audio_type == 3)
805 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
808 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
809 int stream_index = ff_find_stream_index(s, sid);
810 if (stream_index >= 0) {
813 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
816 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
817 int stream_index = ff_find_stream_index(s, sid);
818 if (stream_index >= 0) {
819 AVStream *st = s->streams[stream_index];
822 avio_read(pb, language, 3);
825 av_dict_set(&st->metadata, "language", language, 0);
826 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
827 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
831 } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
832 int stream_index = ff_find_stream_index(s, sid);
833 if (stream_index >= 0) {
835 wtv->pts = avio_rl64(pb);
838 wtv->pts = AV_NOPTS_VALUE;
840 wtv->last_valid_pts = wtv->pts;
841 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
842 wtv->epoch = wtv->pts;
843 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
844 avio_skip(pb, WTV_PAD8(len) - consumed);
849 } else if (!ff_guidcmp(g, ff_data_guid)) {
850 int stream_index = ff_find_stream_index(s, sid);
851 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
852 WtvStream *wst = s->streams[stream_index]->priv_data;
860 !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}) ||
861 !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}) ||
862 !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
863 !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}) ||
864 !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}) ||
865 !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}) ||
866 !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}) ||
867 !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}) ||
868 !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}) ||
869 !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}) ||
870 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
871 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
872 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
873 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
874 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
875 !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
876 !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
877 !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
878 !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
881 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
883 avio_skip(pb, WTV_PAD8(len) - consumed);
888 static int read_header(AVFormatContext *s)
890 WtvContext *wtv = s->priv_data;
891 int root_sector, root_size;
892 uint8_t root[WTV_SECTOR_SIZE];
894 int64_t timeline_pos;
899 wtv->last_valid_pts = AV_NOPTS_VALUE;
901 /* read root directory sector */
902 avio_skip(s->pb, 0x30);
903 root_size = avio_rl32(s->pb);
904 if (root_size > sizeof(root)) {
905 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
906 return AVERROR_INVALIDDATA;
909 root_sector = avio_rl32(s->pb);
911 avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
912 root_size = avio_read(s->pb, root, root_size);
914 return AVERROR_INVALIDDATA;
916 /* parse chunks up until first data chunk */
917 wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
919 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
920 return AVERROR_INVALIDDATA;
923 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
926 avio_seek(wtv->pb, -32, SEEK_CUR);
928 timeline_pos = avio_tell(s->pb); // save before opening another file
931 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
933 parse_legacy_attrib(s, pb);
937 /* read seek index */
939 AVStream *st = s->streams[0];
940 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
943 uint64_t timestamp = avio_rl64(pb);
944 uint64_t frame_nb = avio_rl64(pb);
947 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
948 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
952 if (wtv->nb_index_entries) {
953 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
957 uint64_t frame_nb = avio_rl64(pb);
958 uint64_t position = avio_rl64(pb);
961 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
962 AVIndexEntry *e = wtv->index_entries + i;
963 if (frame_nb > e->size)
965 if (position > e->pos)
970 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
976 avio_seek(s->pb, timeline_pos, SEEK_SET);
980 static int read_packet(AVFormatContext *s, AVPacket *pkt)
982 WtvContext *wtv = s->priv_data;
983 AVIOContext *pb = wtv->pb;
984 int stream_index, len, ret;
986 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
987 if (stream_index < 0)
990 ret = av_get_packet(pb, pkt, len - 32);
993 pkt->stream_index = stream_index;
995 avio_skip(pb, WTV_PAD8(len) - len);
999 static int read_seek(AVFormatContext *s, int stream_index,
1000 int64_t ts, int flags)
1002 WtvContext *wtv = s->priv_data;
1003 AVIOContext *pb = wtv->pb;
1004 AVStream *st = s->streams[0];
1005 int64_t ts_relative;
1008 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1009 return AVERROR(ENOSYS);
1011 /* timestamp adjustment is required because wtv->pts values are absolute,
1012 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1014 if (wtv->epoch != AV_NOPTS_VALUE)
1015 ts_relative -= wtv->epoch;
1017 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1019 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1020 if (avio_seek(pb, 0, SEEK_SET) < 0)
1022 } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1023 if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1026 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1027 return AVERROR(ERANGE);
1030 if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1032 wtv->pts = wtv->index_entries[i].timestamp;
1033 if (wtv->epoch != AV_NOPTS_VALUE)
1034 wtv->pts += wtv->epoch;
1035 wtv->last_valid_pts = wtv->pts;
1039 static int read_close(AVFormatContext *s)
1041 WtvContext *wtv = s->priv_data;
1042 av_freep(&wtv->index_entries);
1043 wtvfile_close(wtv->pb);
1047 AVInputFormat ff_wtv_demuxer = {
1049 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1050 .priv_data_size = sizeof(WtvContext),
1051 .read_probe = read_probe,
1052 .read_header = read_header,
1053 .read_packet = read_packet,
1054 .read_seek = read_seek,
1055 .read_close = read_close,
1056 .flags = AVFMT_SHOW_IDS,