2 * Windows Television (WTV) muxer
3 * Copyright (c) 2011 Zhentan Feng <spyfeng at gmail dot com>
4 * Copyright (c) 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 Zhentan Feng <spyfeng at gmail dot com>
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/avassert.h"
35 #define WTV_BIGSECTOR_SIZE (1 << WTV_BIGSECTOR_BITS)
36 #define INDEX_BASE 0x2
37 #define MAX_NB_INDEX 10
39 /* declare utf16le strings */
41 static const uint8_t timeline_table_0_header_events[] =
42 {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'h'_'e'_'a'_'d'_'e'_'r'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
43 static const uint8_t table_0_header_legacy_attrib[] =
44 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'h'_'e'_'a'_'d'_'e'_'r'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
45 static const uint8_t table_0_redirector_legacy_attrib[] =
46 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'r'_'e'_'d'_'i'_'r'_'e'_'c'_'t'_'o'_'r'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
47 static const uint8_t table_0_header_time[] =
48 {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'h'_'e'_'a'_'d'_'e'_'r'_'.'_'t'_'i'_'m'_'e', 0};
49 static const uint8_t legacy_attrib[] =
50 {'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
53 static const ff_asf_guid sub_wtv_guid =
54 {0x8C,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
57 WTV_TIMELINE_TABLE_0_HEADER_EVENTS = 0,
58 WTV_TIMELINE_TABLE_0_ENTRIES_EVENTS,
60 WTV_TABLE_0_HEADER_LEGACY_ATTRIB,
61 WTV_TABLE_0_ENTRIES_LEGACY_ATTRIB,
62 WTV_TABLE_0_REDIRECTOR_LEGACY_ATTRIB,
63 WTV_TABLE_0_HEADER_TIME,
64 WTV_TABLE_0_ENTRIES_TIME,
78 const ff_asf_guid * guid;
88 int64_t timeline_start_pos;
89 WtvFile file[WTV_FILES];
90 int64_t serial; /** chunk serial number */
91 int64_t last_chunk_pos; /** last chunk position */
92 int64_t last_timestamp_pos; /** last timestamp chunk position */
93 int64_t first_index_pos; /** first index_chunk position */
95 WtvChunkEntry index[MAX_NB_INDEX];
99 WtvSyncEntry *st_pairs; /* (serial, timestamp) pairs */
101 WtvSyncEntry *sp_pairs; /* (serial, position) pairs */
111 static void add_serial_pair(WtvSyncEntry ** list, int * count, int64_t serial, int64_t value)
113 int new_count = *count + 1;
114 WtvSyncEntry *new_list = av_realloc(*list, new_count * sizeof(WtvSyncEntry));
117 new_list[*count] = (WtvSyncEntry){serial, value};
122 typedef int WTVHeaderWriteFunc(AVIOContext *pb);
125 const uint8_t *header;
127 WTVHeaderWriteFunc *write_header;
130 static int write_pad(AVIOContext *pb, int size)
132 for (; size > 0; size--)
137 static const ff_asf_guid *get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
140 for (i = 0; av_guid[i].id != AV_CODEC_ID_NONE; i++) {
141 if (id == av_guid[i].id)
142 return &(av_guid[i].guid);
148 * Write chunk header. If header chunk (0x80000000 set) then add to list of header chunks
150 static void write_chunk_header(AVFormatContext *s, const ff_asf_guid *guid, int length, int stream_id)
152 WtvContext *wctx = s->priv_data;
153 AVIOContext *pb = s->pb;
155 wctx->last_chunk_pos = avio_tell(pb) - wctx->timeline_start_pos;
156 ff_put_guid(pb, guid);
157 avio_wl32(pb, 32 + length);
158 avio_wl32(pb, stream_id);
159 avio_wl64(pb, wctx->serial);
161 if ((stream_id & 0x80000000) && guid != &ff_index_guid) {
162 WtvChunkEntry *t = wctx->index + wctx->nb_index;
163 av_assert0(wctx->nb_index < MAX_NB_INDEX);
164 t->pos = wctx->last_chunk_pos;
165 t->serial = wctx->serial;
167 t->stream_id = stream_id & 0x3FFFFFFF;
172 static void write_chunk_header2(AVFormatContext *s, const ff_asf_guid *guid, int stream_id)
174 WtvContext *wctx = s->priv_data;
175 AVIOContext *pb = s->pb;
177 int64_t last_chunk_pos = wctx->last_chunk_pos;
178 write_chunk_header(s, guid, 0, stream_id); // length updated later
179 avio_wl64(pb, last_chunk_pos);
182 static void finish_chunk_noindex(AVFormatContext *s)
184 WtvContext *wctx = s->priv_data;
185 AVIOContext *pb = s->pb;
187 // update the chunk_len field and pad.
188 int64_t chunk_len = avio_tell(pb) - (wctx->last_chunk_pos + wctx->timeline_start_pos);
189 avio_seek(pb, -(chunk_len - 16), SEEK_CUR);
190 avio_wl32(pb, chunk_len);
191 avio_seek(pb, chunk_len - (16 + 4), SEEK_CUR);
193 write_pad(pb, WTV_PAD8(chunk_len) - chunk_len);
197 static void write_index(AVFormatContext *s)
199 AVIOContext *pb = s->pb;
200 WtvContext *wctx = s->priv_data;
203 write_chunk_header2(s, &ff_index_guid, 0x80000000);
207 for (i = 0; i < wctx->nb_index; i++) {
208 WtvChunkEntry *t = wctx->index + i;
209 ff_put_guid(pb, t->guid);
210 avio_wl64(pb, t->pos);
211 avio_wl32(pb, t->stream_id);
212 avio_wl32(pb, 0); // checksum?
213 avio_wl64(pb, t->serial);
215 wctx->nb_index = 0; // reset index
216 finish_chunk_noindex(s);
218 if (!wctx->first_index_pos)
219 wctx->first_index_pos = wctx->last_chunk_pos;
222 static void finish_chunk(AVFormatContext *s)
224 WtvContext *wctx = s->priv_data;
225 finish_chunk_noindex(s);
226 if (wctx->nb_index == MAX_NB_INDEX)
230 static int write_stream_codec_info(AVFormatContext *s, AVStream *st)
232 WtvContext *wctx = s->priv_data;
233 const ff_asf_guid *g, *media_type, *format_type;
234 AVIOContext *pb = s->pb;
235 int64_t hdr_pos_start;
238 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
239 g = get_codec_guid(st->codec->codec_id, ff_video_guids);
240 media_type = &ff_mediatype_video;
241 format_type = &ff_format_mpeg2_video;
242 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
243 g = get_codec_guid(st->codec->codec_id, ff_codec_wav_guids);
244 media_type = &ff_mediatype_audio;
245 format_type = &ff_format_waveformatex;
247 av_log(s, AV_LOG_ERROR, "unknown codec_type (0x%x)\n", st->codec->codec_type);
252 av_log(s, AV_LOG_ERROR, "can't get video codec_id (0x%x) guid.\n", st->codec->codec_id);
256 ff_put_guid(pb, media_type); // mediatype
257 ff_put_guid(pb, &ff_mediasubtype_cpfilters_processed); // subtype
259 ff_put_guid(pb,&ff_format_cpfilters_processed); // format type
260 avio_wl32(pb, 0); // size
262 hdr_pos_start = avio_tell(pb);
263 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
264 if (wctx->first_video_flag) {
265 write_pad(pb, 216); //The size is sensitive.
266 wctx->first_video_flag = 0;
268 write_pad(pb, 72); // aspect ratio
269 ff_put_bmp_header(pb, st->codec, ff_codec_bmp_tags, 0);
272 ff_put_wav_header(pb, st->codec);
274 hdr_size = avio_tell(pb) - hdr_pos_start;
276 // seek back write hdr_size
277 avio_seek(pb, -(hdr_size + 4), SEEK_CUR);
278 avio_wl32(pb, hdr_size + 32);
279 avio_seek(pb, hdr_size, SEEK_CUR);
280 ff_put_guid(pb, g); // actual_subtype
281 ff_put_guid(pb, format_type); // actual_formattype
286 static int write_stream_codec(AVFormatContext *s, AVStream * st)
288 AVIOContext *pb = s->pb;
290 write_chunk_header2(s, &ff_stream1_guid, 0x80000000 | 0x01);
296 ret = write_stream_codec_info(s, st);
298 av_log(s, AV_LOG_ERROR, "write stream codec info failed codec_type(0x%x)\n", st->codec->codec_type);
306 static void write_sync(AVFormatContext *s)
308 AVIOContext *pb = s->pb;
309 WtvContext *wctx = s->priv_data;
310 int64_t last_chunk_pos = wctx->last_chunk_pos;
312 write_chunk_header(s, &ff_sync_guid, 0x18, 0);
313 avio_wl64(pb, wctx->first_index_pos);
314 avio_wl64(pb, wctx->last_timestamp_pos);
318 add_serial_pair(&wctx->sp_pairs, &wctx->nb_sp_pairs, wctx->serial, wctx->last_chunk_pos);
320 wctx->last_chunk_pos = last_chunk_pos;
323 static int write_stream_data(AVFormatContext *s, AVStream *st)
325 AVIOContext *pb = s->pb;
328 write_chunk_header2(s, &ff_SBE2_STREAM_DESC_EVENT, 0x80000000 | (st->index + INDEX_BASE));
329 avio_wl32(pb, 0x00000001);
330 avio_wl32(pb, st->index + INDEX_BASE); //stream_id
331 avio_wl32(pb, 0x00000001);
334 ret = write_stream_codec_info(s, st);
336 av_log(s, AV_LOG_ERROR, "write stream codec info failed codec_type(0x%x)\n", st->codec->codec_type);
341 avpriv_set_pts_info(st, 64, 1, 10000000);
346 static int write_header(AVFormatContext *s)
348 AVIOContext *pb = s->pb;
349 WtvContext *wctx = s->priv_data;
353 wctx->last_chunk_pos = -1;
354 wctx->last_timestamp_pos = -1;
356 ff_put_guid(pb, &ff_wtv_guid);
357 ff_put_guid(pb, &sub_wtv_guid);
361 avio_wl32(pb, 1 << WTV_SECTOR_BITS);
362 avio_wl32(pb, 1 << WTV_BIGSECTOR_BITS);
364 //write initial root fields
365 avio_wl32(pb, 0); // root_size, update later
367 avio_wl32(pb, 0); // root_sector, update it later.
370 avio_wl32(pb, 0); // file ends pointer, update it later.
372 pad = (1 << WTV_SECTOR_BITS) - avio_tell(pb);
375 wctx->timeline_start_pos = avio_tell(pb);
378 wctx->last_chunk_pos = -1;
379 wctx->first_video_flag = 1;
381 for (i = 0; i < s->nb_streams; i++) {
383 if (st->codec->codec_id == AV_CODEC_ID_MJPEG)
385 ret = write_stream_codec(s, st);
387 av_log(s, AV_LOG_ERROR, "write stream codec failed codec_type(0x%x)\n", st->codec->codec_type);
394 for (i = 0; i < s->nb_streams; i++) {
396 if (st->codec->codec_id == AV_CODEC_ID_MJPEG)
398 ret = write_stream_data(s, st);
400 av_log(s, AV_LOG_ERROR, "write stream data failed codec_type(0x%x)\n", st->codec->codec_type);
411 static void write_timestamp(AVFormatContext *s, AVPacket *pkt)
413 AVIOContext *pb = s->pb;
414 WtvContext *wctx = s->priv_data;
415 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
417 write_chunk_header(s, &ff_timestamp_guid, 56, 0x40000000 | (INDEX_BASE + pkt->stream_index));
419 avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
420 avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
421 avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
423 avio_wl64(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY) ? 1 : 0);
426 wctx->last_timestamp_pos = wctx->last_chunk_pos;
429 static int write_packet(AVFormatContext *s, AVPacket *pkt)
431 AVIOContext *pb = s->pb;
432 WtvContext *wctx = s->priv_data;
434 if (s->streams[pkt->stream_index]->codec->codec_id == AV_CODEC_ID_MJPEG && !wctx->thumbnail.size) {
435 av_copy_packet(&wctx->thumbnail, pkt);
439 /* emit sync chunk and 'timeline.table.0.entries.Event' record every 50 frames */
440 if (wctx->serial - (wctx->nb_sp_pairs ? wctx->sp_pairs[wctx->nb_sp_pairs - 1].serial : 0) >= 50)
443 /* emit 'table.0.entries.time' record every 500ms */
444 if (pkt->pts != AV_NOPTS_VALUE && pkt->pts - (wctx->nb_st_pairs ? wctx->st_pairs[wctx->nb_st_pairs - 1].value : 0) >= 5000000)
445 add_serial_pair(&wctx->st_pairs, &wctx->nb_st_pairs, wctx->serial, pkt->pts);
447 if (pkt->pts != AV_NOPTS_VALUE && pkt->pts > wctx->last_pts) {
448 wctx->last_pts = pkt->pts;
449 wctx->last_serial = wctx->serial;
452 // write timestamp chunk
453 write_timestamp(s, pkt);
455 write_chunk_header(s, &ff_data_guid, pkt->size, INDEX_BASE + pkt->stream_index);
456 avio_write(pb, pkt->data, pkt->size);
457 write_pad(pb, WTV_PAD8(pkt->size) - pkt->size);
463 static int write_table0_header_events(AVIOContext *pb)
471 static int write_table0_header_legacy_attrib(AVIOContext *pb)
474 avio_wl32(pb, 0xFFFFFFFF);
476 avio_write(pb, legacy_attrib, sizeof(legacy_attrib));
477 pad = WTV_PAD8(sizeof(legacy_attrib)) - sizeof(legacy_attrib);
480 return 48 + WTV_PAD8(sizeof(legacy_attrib));
483 static int write_table0_header_time(AVIOContext *pb)
491 static const WTVRootEntryTable wtv_root_entry_table[] = {
492 { timeline_table_0_header_events, sizeof(timeline_table_0_header_events), write_table0_header_events},
493 { ff_timeline_table_0_entries_Events_le16, sizeof(ff_timeline_table_0_entries_Events_le16), NULL},
494 { ff_timeline_le16, sizeof(ff_timeline_le16), NULL},
495 { table_0_header_legacy_attrib, sizeof(table_0_header_legacy_attrib), write_table0_header_legacy_attrib},
496 { ff_table_0_entries_legacy_attrib_le16, sizeof(ff_table_0_entries_legacy_attrib_le16), NULL},
497 { table_0_redirector_legacy_attrib, sizeof(table_0_redirector_legacy_attrib), NULL},
498 { table_0_header_time, sizeof(table_0_header_time), write_table0_header_time},
499 { ff_table_0_entries_time_le16, sizeof(ff_table_0_entries_time_le16), NULL},
502 static int write_root_table(AVFormatContext *s, int64_t sector_pos)
504 AVIOContext *pb = s->pb;
505 WtvContext *wctx = s->priv_data;
509 const WTVRootEntryTable *h = wtv_root_entry_table;
510 for (i = 0; i < sizeof(wtv_root_entry_table)/sizeof(WTVRootEntryTable); i++, h++) {
511 WtvFile *w = &wctx->file[i];
512 int filename_padding = WTV_PAD8(h->header_size) - h->header_size;
513 WTVHeaderWriteFunc *write = h->write_header;
517 ff_put_guid(pb, &ff_dir_entry_guid);
518 len_pos = avio_tell(pb);
519 avio_wl16(pb, 40 + h->header_size + filename_padding + 8); // maybe updated later
521 avio_wl64(pb, write ? 0 : w->length);// maybe update later
522 avio_wl32(pb, (h->header_size + filename_padding) >> 1);
525 avio_write(pb, h->header, h->header_size);
526 write_pad(pb, filename_padding);
530 // update length field
531 avio_seek(pb, len_pos, SEEK_SET);
532 avio_wl64(pb, 40 + h->header_size + filename_padding + len);
533 avio_wl64(pb, len |(1ULL<<62) | (1ULL<<60));
534 avio_seek(pb, 8 + h->header_size + filename_padding + len, SEEK_CUR);
536 avio_wl32(pb, w->first_sector);
537 avio_wl32(pb, w->depth);
541 // caculate root table size
542 size = avio_tell(pb) - sector_pos;
543 pad = WTV_SECTOR_SIZE- size;
549 static void write_fat(AVIOContext *pb, int start_sector, int nb_sectors, int shift)
552 for (i = 0; i < nb_sectors; i++) {
553 avio_wl32(pb, start_sector + (i << shift));
555 // pad left sector pointer size
556 write_pad(pb, WTV_SECTOR_SIZE - ((nb_sectors << 2) % WTV_SECTOR_SIZE));
559 static int64_t write_fat_sector(AVFormatContext *s, int64_t start_pos, int nb_sectors, int sector_bits, int depth)
561 int64_t start_sector = start_pos >> WTV_SECTOR_BITS;
562 int shift = sector_bits - WTV_SECTOR_BITS;
564 int64_t fat = avio_tell(s->pb);
565 write_fat(s->pb, start_sector, nb_sectors, shift);
568 int64_t start_sector1 = fat >> WTV_SECTOR_BITS;
569 int nb_sectors1 = ((nb_sectors << 2) + WTV_SECTOR_SIZE - 1) / WTV_SECTOR_SIZE;
570 int64_t fat1 = avio_tell(s->pb);
572 write_fat(s->pb, start_sector1, nb_sectors1, 0);
579 static void write_table_entries_events(AVFormatContext *s)
581 AVIOContext *pb = s->pb;
582 WtvContext *wctx = s->priv_data;
584 for (i = 0; i < wctx->nb_sp_pairs; i++) {
585 avio_wl64(pb, wctx->sp_pairs[i].serial);
586 avio_wl64(pb, wctx->sp_pairs[i].value);
590 static void write_table_entries_time(AVFormatContext *s)
592 AVIOContext *pb = s->pb;
593 WtvContext *wctx = s->priv_data;
595 for (i = 0; i < wctx->nb_st_pairs; i++) {
596 avio_wl64(pb, wctx->st_pairs[i].value);
597 avio_wl64(pb, wctx->st_pairs[i].serial);
599 avio_wl64(pb, wctx->last_pts);
600 avio_wl64(pb, wctx->last_serial);
603 static void write_metadata_header(AVIOContext *pb, int type, const char *key, int value_size)
605 ff_put_guid(pb, &ff_metadata_guid);
607 avio_wl32(pb, value_size);
608 avio_put_str16le(pb, key);
611 static int metadata_header_size(const char *key)
613 return 16 + 4 + 4 + strlen(key)*2 + 2;
616 static void write_tag_int32(AVIOContext *pb, const char *key, int value)
618 write_metadata_header(pb, 0, key, 4);
619 avio_wl32(pb, value);
622 static void write_tag(AVIOContext *pb, const char *key, const char *value)
624 write_metadata_header(pb, 1, key, strlen(value)*2 + 2);
625 avio_put_str16le(pb, value);
628 static int attachment_value_size(const AVPacket *pkt, const AVDictionaryEntry *e)
630 return strlen("image/jpeg")*2 + 2 + 1 + (e ? strlen(e->value)*2 : 0) + 2 + 4 + pkt->size;
633 static void write_table_entries_attrib(AVFormatContext *s)
635 WtvContext *wctx = s->priv_data;
636 AVIOContext *pb = s->pb;
637 AVDictionaryEntry *tag = 0;
639 //FIXME: translate special tags (e.g. WM/Bitrate) to binary representation
640 ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
641 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
642 write_tag(pb, tag->key, tag->value);
644 if (wctx->thumbnail.size) {
645 AVStream *st = s->streams[wctx->thumbnail.stream_index];
646 tag = av_dict_get(st->metadata, "title", NULL, 0);
647 write_metadata_header(pb, 2, "WM/Picture", attachment_value_size(&wctx->thumbnail, tag));
649 avio_put_str16le(pb, "image/jpeg");
651 avio_put_str16le(pb, tag ? tag->value : "");
653 avio_wl32(pb, wctx->thumbnail.size);
654 avio_write(pb, wctx->thumbnail.data, wctx->thumbnail.size);
656 write_tag_int32(pb, "WM/MediaThumbType", 2);
660 static void write_table_redirector_legacy_attrib(AVFormatContext *s)
662 WtvContext *wctx = s->priv_data;
663 AVIOContext *pb = s->pb;
664 AVDictionaryEntry *tag = 0;
667 //FIXME: translate special tags to binary representation
668 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
670 pos += metadata_header_size(tag->key) + strlen(tag->value)*2 + 2;
673 if (wctx->thumbnail.size) {
674 AVStream *st = s->streams[wctx->thumbnail.stream_index];
676 pos += metadata_header_size("WM/Picture") + attachment_value_size(&wctx->thumbnail, av_dict_get(st->metadata, "title", NULL, 0));
679 pos += metadata_header_size("WM/MediaThumbType") + 4;
684 * Pad the remainder of a file
685 * Write out fat table
686 * @return <0 on error
688 static int finish_file(AVFormatContext *s, enum WtvFileIndex index, int64_t start_pos)
690 WtvContext *wctx = s->priv_data;
691 AVIOContext *pb = s->pb;
692 WtvFile *w = &wctx->file[index];
693 int64_t end_pos = avio_tell(pb);
694 int sector_bits, nb_sectors, pad;
696 av_assert0(index < WTV_FILES);
698 w->length = (end_pos - start_pos);
700 // determine optimal fat table depth, sector_bits, nb_sectors
701 if (w->length <= WTV_SECTOR_SIZE) {
703 sector_bits = WTV_SECTOR_BITS;
704 } else if (w->length <= (WTV_SECTOR_SIZE / 4) * WTV_SECTOR_SIZE) {
706 sector_bits = WTV_SECTOR_BITS;
707 } else if (w->length <= (WTV_SECTOR_SIZE / 4) * WTV_BIGSECTOR_SIZE) {
709 sector_bits = WTV_BIGSECTOR_BITS;
710 } else if (w->length <= (int64_t)(WTV_SECTOR_SIZE / 4) * (WTV_SECTOR_SIZE / 4) * WTV_SECTOR_SIZE) {
712 sector_bits = WTV_SECTOR_BITS;
713 } else if (w->length <= (int64_t)(WTV_SECTOR_SIZE / 4) * (WTV_SECTOR_SIZE / 4) * WTV_BIGSECTOR_SIZE) {
715 sector_bits = WTV_BIGSECTOR_BITS;
717 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (%"PRIi64" bytes)\n", w->length);
721 // determine the nb_sectors
722 nb_sectors = (int)(w->length >> sector_bits);
724 // pad sector of timeline
725 pad = (1 << sector_bits) - (w->length % (1 << sector_bits));
733 w->first_sector = write_fat_sector(s, start_pos, nb_sectors, sector_bits, w->depth) >> WTV_SECTOR_BITS;
735 w->first_sector = start_pos >> WTV_SECTOR_BITS;
738 w->length |= 1ULL<<60;
739 if (sector_bits == WTV_SECTOR_BITS)
740 w->length |= 1ULL<<63;
745 static int write_trailer(AVFormatContext *s)
747 WtvContext *wctx = s->priv_data;
748 AVIOContext *pb = s->pb;
751 int64_t start_pos, file_end_pos;
753 if (finish_file(s, WTV_TIMELINE, wctx->timeline_start_pos) < 0)
756 start_pos = avio_tell(pb);
757 write_table_entries_events(s);
758 if (finish_file(s, WTV_TIMELINE_TABLE_0_ENTRIES_EVENTS, start_pos) < 0)
761 start_pos = avio_tell(pb);
762 write_table_entries_attrib(s);
763 if (finish_file(s, WTV_TABLE_0_ENTRIES_LEGACY_ATTRIB, start_pos) < 0)
766 start_pos = avio_tell(pb);
767 write_table_redirector_legacy_attrib(s);
768 if (finish_file(s, WTV_TABLE_0_REDIRECTOR_LEGACY_ATTRIB, start_pos) < 0)
771 start_pos = avio_tell(pb);
772 write_table_entries_time(s);
773 if (finish_file(s, WTV_TABLE_0_ENTRIES_TIME, start_pos) < 0)
777 sector_pos = avio_tell(pb);
778 root_size = write_root_table(s, sector_pos);
780 file_end_pos = avio_tell(pb);
782 avio_seek(pb, 0x30, SEEK_SET);
783 avio_wl32(pb, root_size);
784 avio_seek(pb, 4, SEEK_CUR);
785 avio_wl32(pb, sector_pos >> WTV_SECTOR_BITS);
786 avio_seek(pb, 0x5c, SEEK_SET);
787 avio_wl32(pb, file_end_pos >> WTV_SECTOR_BITS);
791 av_free(wctx->sp_pairs);
792 av_free(wctx->st_pairs);
793 av_free_packet(&wctx->thumbnail);
797 AVOutputFormat ff_wtv_muxer = {
799 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
801 .priv_data_size = sizeof(WtvContext),
802 .audio_codec = AV_CODEC_ID_AC3,
803 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
804 .write_header = write_header,
805 .write_packet = write_packet,
806 .write_trailer = write_trailer,
807 .codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags,
808 ff_codec_wav_tags, 0 },