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"
31 #include "avio_internal.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 #define write_pad(pb, size) ffio_fill(pb, 0, size)
133 * Write chunk header. If header chunk (0x80000000 set) then add to list of header chunks
135 static void write_chunk_header(AVFormatContext *s, const ff_asf_guid *guid, int length, int stream_id)
137 WtvContext *wctx = s->priv_data;
138 AVIOContext *pb = s->pb;
140 wctx->last_chunk_pos = avio_tell(pb) - wctx->timeline_start_pos;
141 ff_put_guid(pb, guid);
142 avio_wl32(pb, 32 + length);
143 avio_wl32(pb, stream_id);
144 avio_wl64(pb, wctx->serial);
146 if ((stream_id & 0x80000000) && guid != &ff_index_guid) {
147 WtvChunkEntry *t = wctx->index + wctx->nb_index;
148 av_assert0(wctx->nb_index < MAX_NB_INDEX);
149 t->pos = wctx->last_chunk_pos;
150 t->serial = wctx->serial;
152 t->stream_id = stream_id & 0x3FFFFFFF;
157 static void write_chunk_header2(AVFormatContext *s, const ff_asf_guid *guid, int stream_id)
159 WtvContext *wctx = s->priv_data;
160 AVIOContext *pb = s->pb;
162 int64_t last_chunk_pos = wctx->last_chunk_pos;
163 write_chunk_header(s, guid, 0, stream_id); // length updated later
164 avio_wl64(pb, last_chunk_pos);
167 static void finish_chunk_noindex(AVFormatContext *s)
169 WtvContext *wctx = s->priv_data;
170 AVIOContext *pb = s->pb;
172 // update the chunk_len field and pad.
173 int64_t chunk_len = avio_tell(pb) - (wctx->last_chunk_pos + wctx->timeline_start_pos);
174 avio_seek(pb, -(chunk_len - 16), SEEK_CUR);
175 avio_wl32(pb, chunk_len);
176 avio_seek(pb, chunk_len - (16 + 4), SEEK_CUR);
178 write_pad(pb, WTV_PAD8(chunk_len) - chunk_len);
182 static void write_index(AVFormatContext *s)
184 AVIOContext *pb = s->pb;
185 WtvContext *wctx = s->priv_data;
188 write_chunk_header2(s, &ff_index_guid, 0x80000000);
192 for (i = 0; i < wctx->nb_index; i++) {
193 WtvChunkEntry *t = wctx->index + i;
194 ff_put_guid(pb, t->guid);
195 avio_wl64(pb, t->pos);
196 avio_wl32(pb, t->stream_id);
197 avio_wl32(pb, 0); // checksum?
198 avio_wl64(pb, t->serial);
200 wctx->nb_index = 0; // reset index
201 finish_chunk_noindex(s);
203 if (!wctx->first_index_pos)
204 wctx->first_index_pos = wctx->last_chunk_pos;
207 static void finish_chunk(AVFormatContext *s)
209 WtvContext *wctx = s->priv_data;
210 finish_chunk_noindex(s);
211 if (wctx->nb_index == MAX_NB_INDEX)
215 static void put_videoinfoheader2(AVIOContext *pb, AVStream *st)
217 AVRational dar = av_mul_q(st->sample_aspect_ratio, (AVRational){st->codec->width, st->codec->height});
218 unsigned int num, den;
219 av_reduce(&num, &den, dar.num, dar.den, 0xFFFFFFFF);
221 /* VIDEOINFOHEADER2 */
224 avio_wl32(pb, st->codec->width);
225 avio_wl32(pb, st->codec->height);
232 avio_wl32(pb, st->codec->bit_rate);
234 avio_wl64(pb, st->avg_frame_rate.num && st->avg_frame_rate.den ? INT64_C(10000000) / av_q2d(st->avg_frame_rate) : 0);
243 ff_put_bmp_header(pb, st->codec, ff_codec_bmp_tags, 0, 1);
245 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
248 avio_wl32(pb, st->codec->extradata_size);
252 avio_write(pb, st->codec->extradata, st->codec->extradata_size);
257 static int write_stream_codec_info(AVFormatContext *s, AVStream *st)
259 const ff_asf_guid *g, *media_type, *format_type;
260 const AVCodecTag *tags;
261 AVIOContext *pb = s->pb;
262 int64_t hdr_pos_start;
265 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
266 g = get_codec_guid(st->codec->codec_id, ff_video_guids);
267 media_type = &ff_mediatype_video;
268 format_type = st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO ? &ff_format_mpeg2_video : &ff_format_videoinfo2;
269 tags = ff_codec_bmp_tags;
270 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
271 g = get_codec_guid(st->codec->codec_id, ff_codec_wav_guids);
272 media_type = &ff_mediatype_audio;
273 format_type = &ff_format_waveformatex;
274 tags = ff_codec_wav_tags;
276 av_log(s, AV_LOG_ERROR, "unknown codec_type (0x%x)\n", st->codec->codec_type);
280 ff_put_guid(pb, media_type); // mediatype
281 ff_put_guid(pb, &ff_mediasubtype_cpfilters_processed); // subtype
283 ff_put_guid(pb,&ff_format_cpfilters_processed); // format type
284 avio_wl32(pb, 0); // size
286 hdr_pos_start = avio_tell(pb);
287 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
288 put_videoinfoheader2(pb, st);
290 if (ff_put_wav_header(pb, st->codec) < 0)
291 format_type = &ff_format_none;
293 hdr_size = avio_tell(pb) - hdr_pos_start;
295 // seek back write hdr_size
296 avio_seek(pb, -(hdr_size + 4), SEEK_CUR);
297 avio_wl32(pb, hdr_size + 32);
298 avio_seek(pb, hdr_size, SEEK_CUR);
300 ff_put_guid(pb, g); // actual_subtype
302 int tag = ff_codec_get_tag(tags, st->codec->codec_id);
304 av_log(s, AV_LOG_ERROR, "unsupported codec_id (0x%x)\n", st->codec->codec_id);
308 avio_write(pb, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12);
310 ff_put_guid(pb, format_type); // actual_formattype
315 static int write_stream_codec(AVFormatContext *s, AVStream * st)
317 AVIOContext *pb = s->pb;
319 write_chunk_header2(s, &ff_stream1_guid, 0x80000000 | 0x01);
325 ret = write_stream_codec_info(s, st);
327 av_log(s, AV_LOG_ERROR, "write stream codec info failed codec_type(0x%x)\n", st->codec->codec_type);
335 static void write_sync(AVFormatContext *s)
337 AVIOContext *pb = s->pb;
338 WtvContext *wctx = s->priv_data;
339 int64_t last_chunk_pos = wctx->last_chunk_pos;
341 write_chunk_header(s, &ff_sync_guid, 0x18, 0);
342 avio_wl64(pb, wctx->first_index_pos);
343 avio_wl64(pb, wctx->last_timestamp_pos);
347 add_serial_pair(&wctx->sp_pairs, &wctx->nb_sp_pairs, wctx->serial, wctx->last_chunk_pos);
349 wctx->last_chunk_pos = last_chunk_pos;
352 static int write_stream_data(AVFormatContext *s, AVStream *st)
354 AVIOContext *pb = s->pb;
357 write_chunk_header2(s, &ff_SBE2_STREAM_DESC_EVENT, 0x80000000 | (st->index + INDEX_BASE));
358 avio_wl32(pb, 0x00000001);
359 avio_wl32(pb, st->index + INDEX_BASE); //stream_id
360 avio_wl32(pb, 0x00000001);
363 ret = write_stream_codec_info(s, st);
365 av_log(s, AV_LOG_ERROR, "write stream codec info failed codec_type(0x%x)\n", st->codec->codec_type);
370 avpriv_set_pts_info(st, 64, 1, 10000000);
375 static int write_header(AVFormatContext *s)
377 AVIOContext *pb = s->pb;
378 WtvContext *wctx = s->priv_data;
382 wctx->last_chunk_pos = -1;
383 wctx->last_timestamp_pos = -1;
385 ff_put_guid(pb, &ff_wtv_guid);
386 ff_put_guid(pb, &sub_wtv_guid);
390 avio_wl32(pb, 1 << WTV_SECTOR_BITS);
391 avio_wl32(pb, 1 << WTV_BIGSECTOR_BITS);
393 //write initial root fields
394 avio_wl32(pb, 0); // root_size, update later
396 avio_wl32(pb, 0); // root_sector, update it later.
399 avio_wl32(pb, 0); // file ends pointer, update it later.
401 pad = (1 << WTV_SECTOR_BITS) - avio_tell(pb);
404 wctx->timeline_start_pos = avio_tell(pb);
407 wctx->last_chunk_pos = -1;
408 wctx->first_video_flag = 1;
410 for (i = 0; i < s->nb_streams; i++) {
412 if (st->codec->codec_id == AV_CODEC_ID_MJPEG)
414 ret = write_stream_codec(s, st);
416 av_log(s, AV_LOG_ERROR, "write stream codec failed codec_type(0x%x)\n", st->codec->codec_type);
423 for (i = 0; i < s->nb_streams; i++) {
425 if (st->codec->codec_id == AV_CODEC_ID_MJPEG)
427 ret = write_stream_data(s, st);
429 av_log(s, AV_LOG_ERROR, "write stream data failed codec_type(0x%x)\n", st->codec->codec_type);
440 static void write_timestamp(AVFormatContext *s, AVPacket *pkt)
442 AVIOContext *pb = s->pb;
443 WtvContext *wctx = s->priv_data;
444 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
446 write_chunk_header(s, &ff_timestamp_guid, 56, 0x40000000 | (INDEX_BASE + pkt->stream_index));
448 avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
449 avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
450 avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
452 avio_wl64(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY) ? 1 : 0);
455 wctx->last_timestamp_pos = wctx->last_chunk_pos;
458 static int write_packet(AVFormatContext *s, AVPacket *pkt)
460 AVIOContext *pb = s->pb;
461 WtvContext *wctx = s->priv_data;
463 if (s->streams[pkt->stream_index]->codec->codec_id == AV_CODEC_ID_MJPEG && !wctx->thumbnail.size) {
464 av_copy_packet(&wctx->thumbnail, pkt);
468 /* emit sync chunk and 'timeline.table.0.entries.Event' record every 50 frames */
469 if (wctx->serial - (wctx->nb_sp_pairs ? wctx->sp_pairs[wctx->nb_sp_pairs - 1].serial : 0) >= 50)
472 /* emit 'table.0.entries.time' record every 500ms */
473 if (pkt->pts != AV_NOPTS_VALUE && pkt->pts - (wctx->nb_st_pairs ? wctx->st_pairs[wctx->nb_st_pairs - 1].value : 0) >= 5000000)
474 add_serial_pair(&wctx->st_pairs, &wctx->nb_st_pairs, wctx->serial, pkt->pts);
476 if (pkt->pts != AV_NOPTS_VALUE && pkt->pts > wctx->last_pts) {
477 wctx->last_pts = pkt->pts;
478 wctx->last_serial = wctx->serial;
481 // write timestamp chunk
482 write_timestamp(s, pkt);
484 write_chunk_header(s, &ff_data_guid, pkt->size, INDEX_BASE + pkt->stream_index);
485 avio_write(pb, pkt->data, pkt->size);
486 write_pad(pb, WTV_PAD8(pkt->size) - pkt->size);
492 static int write_table0_header_events(AVIOContext *pb)
500 static int write_table0_header_legacy_attrib(AVIOContext *pb)
503 avio_wl32(pb, 0xFFFFFFFF);
505 avio_write(pb, legacy_attrib, sizeof(legacy_attrib));
506 pad = WTV_PAD8(sizeof(legacy_attrib)) - sizeof(legacy_attrib);
509 return 48 + WTV_PAD8(sizeof(legacy_attrib));
512 static int write_table0_header_time(AVIOContext *pb)
520 static const WTVRootEntryTable wtv_root_entry_table[] = {
521 { timeline_table_0_header_events, sizeof(timeline_table_0_header_events), write_table0_header_events},
522 { ff_timeline_table_0_entries_Events_le16, sizeof(ff_timeline_table_0_entries_Events_le16), NULL},
523 { ff_timeline_le16, sizeof(ff_timeline_le16), NULL},
524 { table_0_header_legacy_attrib, sizeof(table_0_header_legacy_attrib), write_table0_header_legacy_attrib},
525 { ff_table_0_entries_legacy_attrib_le16, sizeof(ff_table_0_entries_legacy_attrib_le16), NULL},
526 { table_0_redirector_legacy_attrib, sizeof(table_0_redirector_legacy_attrib), NULL},
527 { table_0_header_time, sizeof(table_0_header_time), write_table0_header_time},
528 { ff_table_0_entries_time_le16, sizeof(ff_table_0_entries_time_le16), NULL},
531 static int write_root_table(AVFormatContext *s, int64_t sector_pos)
533 AVIOContext *pb = s->pb;
534 WtvContext *wctx = s->priv_data;
538 const WTVRootEntryTable *h = wtv_root_entry_table;
539 for (i = 0; i < sizeof(wtv_root_entry_table)/sizeof(WTVRootEntryTable); i++, h++) {
540 WtvFile *w = &wctx->file[i];
541 int filename_padding = WTV_PAD8(h->header_size) - h->header_size;
542 WTVHeaderWriteFunc *write = h->write_header;
546 ff_put_guid(pb, &ff_dir_entry_guid);
547 len_pos = avio_tell(pb);
548 avio_wl16(pb, 40 + h->header_size + filename_padding + 8); // maybe updated later
550 avio_wl64(pb, write ? 0 : w->length);// maybe update later
551 avio_wl32(pb, (h->header_size + filename_padding) >> 1);
554 avio_write(pb, h->header, h->header_size);
555 write_pad(pb, filename_padding);
559 // update length field
560 avio_seek(pb, len_pos, SEEK_SET);
561 avio_wl64(pb, 40 + h->header_size + filename_padding + len);
562 avio_wl64(pb, len |(1ULL<<62) | (1ULL<<60));
563 avio_seek(pb, 8 + h->header_size + filename_padding + len, SEEK_CUR);
565 avio_wl32(pb, w->first_sector);
566 avio_wl32(pb, w->depth);
570 // caculate root table size
571 size = avio_tell(pb) - sector_pos;
572 pad = WTV_SECTOR_SIZE- size;
578 static void write_fat(AVIOContext *pb, int start_sector, int nb_sectors, int shift)
581 for (i = 0; i < nb_sectors; i++) {
582 avio_wl32(pb, start_sector + (i << shift));
584 // pad left sector pointer size
585 write_pad(pb, WTV_SECTOR_SIZE - ((nb_sectors << 2) % WTV_SECTOR_SIZE));
588 static int64_t write_fat_sector(AVFormatContext *s, int64_t start_pos, int nb_sectors, int sector_bits, int depth)
590 int64_t start_sector = start_pos >> WTV_SECTOR_BITS;
591 int shift = sector_bits - WTV_SECTOR_BITS;
593 int64_t fat = avio_tell(s->pb);
594 write_fat(s->pb, start_sector, nb_sectors, shift);
597 int64_t start_sector1 = fat >> WTV_SECTOR_BITS;
598 int nb_sectors1 = ((nb_sectors << 2) + WTV_SECTOR_SIZE - 1) / WTV_SECTOR_SIZE;
599 int64_t fat1 = avio_tell(s->pb);
601 write_fat(s->pb, start_sector1, nb_sectors1, 0);
608 static void write_table_entries_events(AVFormatContext *s)
610 AVIOContext *pb = s->pb;
611 WtvContext *wctx = s->priv_data;
613 for (i = 0; i < wctx->nb_sp_pairs; i++) {
614 avio_wl64(pb, wctx->sp_pairs[i].serial);
615 avio_wl64(pb, wctx->sp_pairs[i].value);
619 static void write_table_entries_time(AVFormatContext *s)
621 AVIOContext *pb = s->pb;
622 WtvContext *wctx = s->priv_data;
624 for (i = 0; i < wctx->nb_st_pairs; i++) {
625 avio_wl64(pb, wctx->st_pairs[i].value);
626 avio_wl64(pb, wctx->st_pairs[i].serial);
628 avio_wl64(pb, wctx->last_pts);
629 avio_wl64(pb, wctx->last_serial);
632 static void write_metadata_header(AVIOContext *pb, int type, const char *key, int value_size)
634 ff_put_guid(pb, &ff_metadata_guid);
636 avio_wl32(pb, value_size);
637 avio_put_str16le(pb, key);
640 static int metadata_header_size(const char *key)
642 return 16 + 4 + 4 + strlen(key)*2 + 2;
645 static void write_tag_int32(AVIOContext *pb, const char *key, int value)
647 write_metadata_header(pb, 0, key, 4);
648 avio_wl32(pb, value);
651 static void write_tag(AVIOContext *pb, const char *key, const char *value)
653 write_metadata_header(pb, 1, key, strlen(value)*2 + 2);
654 avio_put_str16le(pb, value);
657 static int attachment_value_size(const AVPacket *pkt, const AVDictionaryEntry *e)
659 return strlen("image/jpeg")*2 + 2 + 1 + (e ? strlen(e->value)*2 : 0) + 2 + 4 + pkt->size;
662 static void write_table_entries_attrib(AVFormatContext *s)
664 WtvContext *wctx = s->priv_data;
665 AVIOContext *pb = s->pb;
666 AVDictionaryEntry *tag = 0;
668 //FIXME: translate special tags (e.g. WM/Bitrate) to binary representation
669 ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
670 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
671 write_tag(pb, tag->key, tag->value);
673 if (wctx->thumbnail.size) {
674 AVStream *st = s->streams[wctx->thumbnail.stream_index];
675 tag = av_dict_get(st->metadata, "title", NULL, 0);
676 write_metadata_header(pb, 2, "WM/Picture", attachment_value_size(&wctx->thumbnail, tag));
678 avio_put_str16le(pb, "image/jpeg");
680 avio_put_str16le(pb, tag ? tag->value : "");
682 avio_wl32(pb, wctx->thumbnail.size);
683 avio_write(pb, wctx->thumbnail.data, wctx->thumbnail.size);
685 write_tag_int32(pb, "WM/MediaThumbType", 2);
689 static void write_table_redirector_legacy_attrib(AVFormatContext *s)
691 WtvContext *wctx = s->priv_data;
692 AVIOContext *pb = s->pb;
693 AVDictionaryEntry *tag = 0;
696 //FIXME: translate special tags to binary representation
697 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
699 pos += metadata_header_size(tag->key) + strlen(tag->value)*2 + 2;
702 if (wctx->thumbnail.size) {
703 AVStream *st = s->streams[wctx->thumbnail.stream_index];
705 pos += metadata_header_size("WM/Picture") + attachment_value_size(&wctx->thumbnail, av_dict_get(st->metadata, "title", NULL, 0));
708 pos += metadata_header_size("WM/MediaThumbType") + 4;
713 * Pad the remainder of a file
714 * Write out fat table
715 * @return <0 on error
717 static int finish_file(AVFormatContext *s, enum WtvFileIndex index, int64_t start_pos)
719 WtvContext *wctx = s->priv_data;
720 AVIOContext *pb = s->pb;
721 WtvFile *w = &wctx->file[index];
722 int64_t end_pos = avio_tell(pb);
723 int sector_bits, nb_sectors, pad;
725 av_assert0(index < WTV_FILES);
727 w->length = (end_pos - start_pos);
729 // determine optimal fat table depth, sector_bits, nb_sectors
730 if (w->length <= WTV_SECTOR_SIZE) {
732 sector_bits = WTV_SECTOR_BITS;
733 } else if (w->length <= (WTV_SECTOR_SIZE / 4) * WTV_SECTOR_SIZE) {
735 sector_bits = WTV_SECTOR_BITS;
736 } else if (w->length <= (WTV_SECTOR_SIZE / 4) * WTV_BIGSECTOR_SIZE) {
738 sector_bits = WTV_BIGSECTOR_BITS;
739 } else if (w->length <= (int64_t)(WTV_SECTOR_SIZE / 4) * (WTV_SECTOR_SIZE / 4) * WTV_SECTOR_SIZE) {
741 sector_bits = WTV_SECTOR_BITS;
742 } else if (w->length <= (int64_t)(WTV_SECTOR_SIZE / 4) * (WTV_SECTOR_SIZE / 4) * WTV_BIGSECTOR_SIZE) {
744 sector_bits = WTV_BIGSECTOR_BITS;
746 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (%"PRIi64" bytes)\n", w->length);
750 // determine the nb_sectors
751 nb_sectors = (int)(w->length >> sector_bits);
753 // pad sector of timeline
754 pad = (1 << sector_bits) - (w->length % (1 << sector_bits));
762 w->first_sector = write_fat_sector(s, start_pos, nb_sectors, sector_bits, w->depth) >> WTV_SECTOR_BITS;
764 w->first_sector = start_pos >> WTV_SECTOR_BITS;
767 w->length |= 1ULL<<60;
768 if (sector_bits == WTV_SECTOR_BITS)
769 w->length |= 1ULL<<63;
774 static int write_trailer(AVFormatContext *s)
776 WtvContext *wctx = s->priv_data;
777 AVIOContext *pb = s->pb;
780 int64_t start_pos, file_end_pos;
782 if (finish_file(s, WTV_TIMELINE, wctx->timeline_start_pos) < 0)
785 start_pos = avio_tell(pb);
786 write_table_entries_events(s);
787 if (finish_file(s, WTV_TIMELINE_TABLE_0_ENTRIES_EVENTS, start_pos) < 0)
790 start_pos = avio_tell(pb);
791 write_table_entries_attrib(s);
792 if (finish_file(s, WTV_TABLE_0_ENTRIES_LEGACY_ATTRIB, start_pos) < 0)
795 start_pos = avio_tell(pb);
796 write_table_redirector_legacy_attrib(s);
797 if (finish_file(s, WTV_TABLE_0_REDIRECTOR_LEGACY_ATTRIB, start_pos) < 0)
800 start_pos = avio_tell(pb);
801 write_table_entries_time(s);
802 if (finish_file(s, WTV_TABLE_0_ENTRIES_TIME, start_pos) < 0)
806 sector_pos = avio_tell(pb);
807 root_size = write_root_table(s, sector_pos);
809 file_end_pos = avio_tell(pb);
811 avio_seek(pb, 0x30, SEEK_SET);
812 avio_wl32(pb, root_size);
813 avio_seek(pb, 4, SEEK_CUR);
814 avio_wl32(pb, sector_pos >> WTV_SECTOR_BITS);
815 avio_seek(pb, 0x5c, SEEK_SET);
816 avio_wl32(pb, file_end_pos >> WTV_SECTOR_BITS);
820 av_free(wctx->sp_pairs);
821 av_free(wctx->st_pairs);
822 av_free_packet(&wctx->thumbnail);
826 AVOutputFormat ff_wtv_muxer = {
828 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
830 .priv_data_size = sizeof(WtvContext),
831 .audio_codec = AV_CODEC_ID_AC3,
832 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
833 .write_header = write_header,
834 .write_packet = write_packet,
835 .write_trailer = write_trailer,
836 .codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags,
837 ff_codec_wav_tags, 0 },