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ffmpeg/libavformat/wtvenc.c
Peter Ross 1efe4ff91d wtvenc: add @file comment 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2011-11-05 16:51:25 +01:00

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/*
* Windows Television (WTV) muxer
* Copyright (c) 2011 Zhentan Feng <spyfeng at gmail dot com>
* Copyright (c) 2011 Peter Ross <pross@xvid.org>
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Windows Television (WTV) demuxer
* @author Zhentan Feng <spyfeng at gmail dot com>
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"
#include "avformat.h"
#include "internal.h"
#include "wtv.h"
#define WTV_BIGSECTOR_SIZE (1 << WTV_BIGSECTOR_BITS)
#define INDEX_BASE 0x2
#define MAX_NB_INDEX 10
/* declare utf16le strings */
#define _ , 0,
static const uint8_t timeline_table_0_header_events[] =
{'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};
static const uint8_t table_0_header_legacy_attrib[] =
{'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};
static const uint8_t table_0_redirector_legacy_attrib[] =
{'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};
static const uint8_t table_0_header_time[] =
{'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'h'_'e'_'a'_'d'_'e'_'r'_'.'_'t'_'i'_'m'_'e', 0};
static const uint8_t legacy_attrib[] =
{'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
#undef _
static const ff_asf_guid sub_wtv_guid =
{0x8C,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
static const ff_asf_guid stream1_guid =
{0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
static const ff_asf_guid sync_guid =
{0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
static const ff_asf_guid index_guid =
{0x96,0xc3,0xd2,0xc2,0x7e,0x9a,0xda,0x11,0x8b,0xf7,0x00,0x07,0xe9,0x5e,0xad,0x8d};
enum WtvFileIndex {
WTV_TIMELINE_TABLE_0_HEADER_EVENTS = 0,
WTV_TIMELINE_TABLE_0_ENTRIES_EVENTS,
WTV_TIMELINE,
WTV_TABLE_0_HEADER_LEGACY_ATTRIB,
WTV_TABLE_0_ENTRIES_LEGACY_ATTRIB,
WTV_TABLE_0_REDIRECTOR_LEGACY_ATTRIB,
WTV_TABLE_0_HEADER_TIME,
WTV_TABLE_0_ENTRIES_TIME,
WTV_FILES
};
typedef struct {
int64_t length;
const void *header;
int depth;
int first_sector;
} WtvFile;
typedef struct {
int64_t pos;
int64_t serial;
const ff_asf_guid * guid;
int stream_id;
} WtvChunkEntry;
typedef struct {
int64_t timeline_start_pos;
WtvFile file[WTV_FILES];
int64_t serial; /** chunk serial number */
int64_t last_chunk_pos; /** last chunk position */
int64_t frame_nb;
WtvChunkEntry index[MAX_NB_INDEX];
int nb_index;
int first_video_flag;
int64_t sync_pos;
} WtvContext;
typedef int WTVHeaderWriteFunc(AVIOContext *pb);
typedef struct {
const uint8_t *header;
int header_size;
WTVHeaderWriteFunc *write_header;
} WTVRootEntryTable;
static int write_pad(AVIOContext *pb, int size)
{
for (; size > 0; size--)
avio_w8(pb, 0);
return 0;
}
static void put_guid(AVIOContext *s, const ff_asf_guid *g)
{
assert(sizeof(*g) == 16);
avio_write(s, *g, sizeof(*g));
}
static const ff_asf_guid *get_codec_guid(enum CodecID id, const AVCodecGuid *av_guid)
{
int i;
for (i = 0; av_guid[i].id != CODEC_ID_NONE; i++) {
if (id == av_guid[i].id)
return &(av_guid[i].guid);
}
return NULL;
}
/**
* Write chunk header. If header chunk (0x80000000 set) then add to list of header chunks
*/
static void write_chunk_header(AVFormatContext *s, const ff_asf_guid *guid, int length, int stream_id)
{
WtvContext *wctx = s->priv_data;
AVIOContext *pb = s->pb;
wctx->last_chunk_pos = avio_tell(pb) - wctx->timeline_start_pos;
put_guid(pb, guid);
avio_wl32(pb, 32 + length);
avio_wl32(pb, stream_id);
avio_wl64(pb, wctx->serial);
if ((stream_id & 0x80000000) && guid != &index_guid) {
WtvChunkEntry *t = wctx->index + wctx->nb_index;
av_assert0(wctx->nb_index < MAX_NB_INDEX);
t->pos = wctx->last_chunk_pos;
t->serial = wctx->serial;
t->guid = guid;
t->stream_id = stream_id & 0x3FFFFFFF;
wctx->nb_index++;
}
}
static void write_chunk_header2(AVFormatContext *s, const ff_asf_guid *guid, int stream_id)
{
WtvContext *wctx = s->priv_data;
AVIOContext *pb = s->pb;
int64_t last_chunk_pos = wctx->last_chunk_pos;
write_chunk_header(s, guid, 0, stream_id); // length updated later
avio_wl64(pb, last_chunk_pos);
}
static void finish_chunk_noindex(AVFormatContext *s)
{
WtvContext *wctx = s->priv_data;
AVIOContext *pb = s->pb;
// update the chunk_len field and pad.
int64_t chunk_len = avio_tell(pb) - (wctx->last_chunk_pos + wctx->timeline_start_pos);
avio_seek(pb, -(chunk_len - 16), SEEK_CUR);
avio_wl32(pb, chunk_len);
avio_seek(pb, chunk_len - (16 + 4), SEEK_CUR);
write_pad(pb, WTV_PAD8(chunk_len) - chunk_len);
wctx->serial++;
}
static void write_index(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
int i;
write_chunk_header2(s, &index_guid, 0x80000000);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
for (i = 0; i < wctx->nb_index; i++) {
WtvChunkEntry *t = wctx->index + i;
put_guid(pb, t->guid);
avio_wl64(pb, t->pos);
avio_wl32(pb, t->stream_id);
avio_wl32(pb, 0); // checksum?
avio_wl64(pb, t->serial);
}
wctx->nb_index = 0; // reset index
finish_chunk_noindex(s);
}
static void finish_chunk(AVFormatContext *s)
{
WtvContext *wctx = s->priv_data;
finish_chunk_noindex(s);
if (wctx->nb_index == MAX_NB_INDEX)
write_index(s);
}
static int write_stream_codec_info(AVFormatContext *s, AVStream *st)
{
WtvContext *wctx = s->priv_data;
const ff_asf_guid *g, *media_type, *format_type;
AVIOContext *pb = s->pb;
int64_t hdr_pos_start;
int hdr_size = 0;
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
g = get_codec_guid(st->codec->codec_id, ff_video_guids);
media_type = &ff_mediatype_video;
format_type = &ff_format_mpeg2_video;
} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
g = get_codec_guid(st->codec->codec_id, ff_codec_wav_guids);
media_type = &ff_mediatype_audio;
format_type = &ff_format_waveformatex;
} else {
av_log(s, AV_LOG_ERROR, "unknown codec_type (0x%x)\n", st->codec->codec_type);
return -1;
}
if (g == NULL) {
av_log(s, AV_LOG_ERROR, "can't get video codec_id (0x%x) guid.\n", st->codec->codec_id);
return -1;
}
put_guid(pb, media_type); // mediatype
put_guid(pb, &ff_mediasubtype_cpfilters_processed); // subtype
write_pad(pb, 12);
put_guid(pb,&ff_format_cpfilters_processed); // format type
avio_wl32(pb, 0); // size
hdr_pos_start = avio_tell(pb);
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if (wctx->first_video_flag) {
write_pad(pb, 216); //The size is sensitive.
wctx->first_video_flag = 0;
} else {
write_pad(pb, 72); // aspect ratio
ff_put_bmp_header(pb, st->codec, ff_codec_bmp_tags, 0);
}
} else {
ff_put_wav_header(pb, st->codec);
}
hdr_size = avio_tell(pb) - hdr_pos_start;
// seek back write hdr_size
avio_seek(pb, -(hdr_size + 4), SEEK_CUR);
avio_wl32(pb, hdr_size + 32);
avio_seek(pb, hdr_size, SEEK_CUR);
put_guid(pb, g); // actual_subtype
put_guid(pb, format_type); // actual_formattype
return 0;
}
static int write_stream_codec(AVFormatContext *s, AVStream * st)
{
AVIOContext *pb = s->pb;
int ret;
write_chunk_header2(s, &stream1_guid, 0x80000000 | 0x01);
avio_wl32(pb, 0x01);
write_pad(pb, 4);
write_pad(pb, 4);
ret = write_stream_codec_info(s, st);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "write stream codec info failed codec_type(0x%x)\n", st->codec->codec_type);
return -1;
}
finish_chunk(s);
return 0;
}
static void write_sync(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
int64_t last_chunk_pos = wctx->last_chunk_pos;
wctx->sync_pos = avio_tell(pb) - wctx->timeline_start_pos;;
write_chunk_header(s, &sync_guid, 0x18, 0);
write_pad(pb, 24);
finish_chunk(s);
wctx->last_chunk_pos = last_chunk_pos;
}
static void write_DSATTRIB_TRANSPORT_PROPERTIES_init(AVFormatContext *s, int stream_index)
{
AVIOContext *pb = s->pb;
write_chunk_header2(s, &ff_DSATTRIB_TRANSPORT_PROPERTIES, 0x80000000 | stream_index);
avio_wl64(pb, stream_index);
avio_wl64(pb, -1);
avio_wl64(pb, 0);
finish_chunk(s);
}
static int write_stream_data(AVFormatContext *s, AVStream *st, int flag)
{
AVIOContext *pb = s->pb;
int ret;
if (!flag) {
write_chunk_header2(s, &ff_stream_guid, 0x80000000 | (st->index + INDEX_BASE));
avio_wl32(pb, 0x00000001);
avio_wl32(pb, st->index + INDEX_BASE); //stream_id
avio_wl32(pb, 0x00000001);
write_pad(pb, 8);
} else {
write_chunk_header2(s, &ff_stream2_guid, 0x80000000 | (st->index + INDEX_BASE));
write_pad(pb, 4);
}
ret = write_stream_codec_info(s, st);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "write stream codec info failed codec_type(0x%x)\n", st->codec->codec_type);
return -1;
}
finish_chunk(s);
av_set_pts_info(st, 64, 1, 10000000);
return 0;
}
static int write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
int i, pad, ret;
AVStream *st;
put_guid(pb, &ff_wtv_guid);
put_guid(pb, &sub_wtv_guid);
avio_wl32(pb, 0x01);
avio_wl32(pb, 0x02);
avio_wl32(pb, 1 << WTV_SECTOR_BITS);
avio_wl32(pb, 1 << WTV_BIGSECTOR_BITS);
//write initial root fields
avio_wl32(pb, 0); // root_size, update later
write_pad(pb, 4);
avio_wl32(pb, 0); // root_sector, update it later.
write_pad(pb, 32);
avio_wl32(pb, 0); // file ends pointer, update it later.
pad = (1 << WTV_SECTOR_BITS) - avio_tell(pb);
write_pad(pb, pad);
wctx->timeline_start_pos = avio_tell(pb);
wctx->serial = 1;
wctx->last_chunk_pos = -1;
wctx->first_video_flag = 1;
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
ret = write_stream_codec(s, st);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "write stream codec failed codec_type(0x%x)\n", st->codec->codec_type);
return -1;
}
if (i + 1 < s->nb_streams) {
write_sync(s);
}
}
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
ret = write_stream_data(s, st, 0);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "write stream data failed codec_type(0x%x)\n", st->codec->codec_type);
return -1;
}
ret = write_stream_data(s, st, 1);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "write stream2 data failed codec_type(0x%x)\n", st->codec->codec_type);
return -1;
}
}
for (i = 0; i < s->nb_streams; i++)
write_DSATTRIB_TRANSPORT_PROPERTIES_init(s, INDEX_BASE + i);
if (wctx->nb_index)
write_index(s);
return 0;
}
static void write_timestamp(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
int flag = 0;
int64_t frame_number = 0;
if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
wctx->frame_nb++;
frame_number = wctx->frame_nb;
flag = pkt->flags & AV_PKT_FLAG_KEY ? 1 : 0;
}
write_chunk_header(s, &ff_timestamp_guid, 56, 0x40000000 | (INDEX_BASE + pkt->stream_index));
write_pad(pb, 8);
avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
avio_wl64(pb, pkt->pts == AV_NOPTS_VALUE ? -1 : pkt->pts);
avio_wl64(pb, frame_number);
avio_wl64(pb, 0);
avio_wl64(pb, flag);
avio_wl64(pb, 0);
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
// write timestamp chunk
write_timestamp(s, pkt);
write_chunk_header(s, &ff_data_guid, pkt->size, INDEX_BASE + pkt->stream_index);
avio_write(pb, pkt->data, pkt->size);
write_pad(pb, WTV_PAD8(pkt->size) - pkt->size);
wctx->serial++;
avio_flush(pb);
return 0;
}
static int write_table0_header_envents(AVIOContext *pb)
{
avio_wl32(pb, 0x10);
write_pad(pb, 84);
avio_wl64(pb, 0x32);
return 96;
}
static int write_table0_header_legacy_attrib(AVIOContext *pb)
{
int pad = 0;
avio_wl32(pb, 0xFFFFFFFF);
write_pad(pb, 12);
avio_write(pb, legacy_attrib, sizeof(legacy_attrib));
pad = WTV_PAD8(sizeof(legacy_attrib)) - sizeof(legacy_attrib);
write_pad(pb, pad);
write_pad(pb, 32);
return 48 + WTV_PAD8(sizeof(legacy_attrib));
}
static int write_table0_header_time(AVIOContext *pb)
{
avio_wl32(pb, 0x10);
write_pad(pb, 76);
avio_wl64(pb, 0x40);
return 88;
}
static const WTVRootEntryTable wtv_root_entry_table[] = {
{ timeline_table_0_header_events, sizeof(timeline_table_0_header_events), write_table0_header_envents},
{ ff_timeline_table_0_entries_Events_le16, sizeof(ff_timeline_table_0_entries_Events_le16), NULL},
{ ff_timeline_le16, sizeof(ff_timeline_le16), NULL},
{ table_0_header_legacy_attrib, sizeof(table_0_header_legacy_attrib), write_table0_header_legacy_attrib},
{ ff_table_0_entries_legacy_attrib_le16, sizeof(ff_table_0_entries_legacy_attrib_le16), NULL},
{ table_0_redirector_legacy_attrib, sizeof(table_0_redirector_legacy_attrib), NULL},
{ table_0_header_time, sizeof(table_0_header_time), write_table0_header_time},
{ ff_table_0_entries_time_le16, sizeof(ff_table_0_entries_time_le16), NULL},
};
static int write_root_table(AVFormatContext *s, int64_t sector_pos)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
int size, pad;
int i;
const WTVRootEntryTable *h = wtv_root_entry_table;
for (i = 0; i < sizeof(wtv_root_entry_table)/sizeof(WTVRootEntryTable); i++, h++) {
WtvFile *w = &wctx->file[i];
int filename_padding = WTV_PAD8(h->header_size) - h->header_size;
WTVHeaderWriteFunc *write = h->write_header;
int len = 0;
int64_t len_pos;
put_guid(pb, &ff_dir_entry_guid);
len_pos = avio_tell(pb);
avio_wl16(pb, 40 + h->header_size + filename_padding + 8); // maybe updated later
write_pad(pb, 6);
avio_wl64(pb, write ? 0 : w->length);// maybe update later
avio_wl32(pb, (h->header_size + filename_padding) >> 1);
write_pad(pb, 4);
avio_write(pb, h->header, h->header_size);
write_pad(pb, filename_padding);
if (write) {
len = write(pb);
// update length field
avio_seek(pb, len_pos, SEEK_SET);
avio_wl64(pb, 40 + h->header_size + filename_padding + len);
avio_wl64(pb, len |(1ULL<<62) | (1ULL<<60));
avio_seek(pb, 8 + h->header_size + filename_padding + len, SEEK_CUR);
} else {
avio_wl32(pb, w->first_sector);
avio_wl32(pb, w->depth);
}
}
// caculate root table size
size = avio_tell(pb) - sector_pos;
pad = WTV_SECTOR_SIZE- size;
write_pad(pb, pad);
return size;
}
static void write_fat(AVIOContext *pb, int start_sector, int nb_sectors, int shift)
{
int i;
for (i = 0; i < nb_sectors; i++) {
avio_wl32(pb, start_sector + (i << shift));
}
// pad left sector pointer size
write_pad(pb, WTV_SECTOR_SIZE - (nb_sectors << 2));
}
static int write_fat_sector(AVFormatContext *s, int64_t start_pos, int nb_sectors, int sector_bits, int depth)
{
int64_t start_sector = start_pos >> WTV_SECTOR_BITS;
int shift = sector_bits - WTV_SECTOR_BITS;
int64_t fat = avio_tell(s->pb);
write_fat(s->pb, start_sector, nb_sectors, shift);
if (depth == 2) {
int64_t start_sector1 = fat >> WTV_SECTOR_BITS;
int nb_sectors1 = ((nb_sectors << 2) + WTV_SECTOR_SIZE - 1) / WTV_SECTOR_SIZE;
int64_t fat1 = avio_tell(s->pb);
write_fat(s->pb, start_sector1, nb_sectors1, 0);
return fat1;
}
return fat;
}
static void write_table_entries_events(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WtvContext *wctx = s->priv_data;
//FIXME: output frame_nb, position pairs.
//We only set the first sync_chunk position here.
avio_wl64(pb, 0x2); avio_wl64(pb, wctx->sync_pos);
}
static void write_tag(AVIOContext *pb, const char *key, const char *value)
{
put_guid(pb, &ff_metadata_guid);
avio_wl32(pb, 1);
avio_wl32(pb, strlen(value)*2 + 2);
avio_put_str16le(pb, key);
avio_put_str16le(pb, value);
}
static void write_table_entries_attrib(AVFormatContext *s)
{
AVDictionaryEntry *tag = 0;
//FIXME: translate special tags (e.g. WM/Bitrate) to binary representation
ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
write_tag(s->pb, tag->key, tag->value);
}
static void write_table_redirector_legacy_attrib(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVDictionaryEntry *tag = 0;
int64_t pos = 0;
//FIXME: translate special tags to binary representation
while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
avio_wl64(pb, pos);
pos += 16 + 4 + 4 + strlen(tag->key)*2 + 2 + strlen(tag->value)*2 + 2;
}
}
/**
* Pad the remainder of a file
* Write out fat table
* @return <0 on error
*/
static int finish_file(AVFormatContext *s, enum WtvFileIndex index, int64_t start_pos)
{
WtvContext *wctx = s->priv_data;
AVIOContext *pb = s->pb;
WtvFile *w = &wctx->file[index];
int64_t end_pos = avio_tell(pb);
int sector_bits, nb_sectors, pad;
av_assert0(index < WTV_FILES);
w->length = (end_pos - start_pos);
// determine optimal fat table depth, sector_bits, nb_sectors
if (w->length <= WTV_SECTOR_SIZE) {
w->depth = 0;
sector_bits = WTV_SECTOR_BITS;
} else if (w->length <= (WTV_SECTOR_SIZE / 4) * WTV_SECTOR_SIZE) {
w->depth = 1;
sector_bits = WTV_SECTOR_BITS;
} else if (w->length <= (WTV_SECTOR_SIZE / 4) * WTV_BIGSECTOR_SIZE) {
w->depth = 1;
sector_bits = WTV_BIGSECTOR_BITS;
} else if (w->length <= (int64_t)(WTV_SECTOR_SIZE / 4) * (WTV_SECTOR_SIZE / 4) * WTV_SECTOR_SIZE) {
w->depth = 2;
sector_bits = WTV_SECTOR_BITS;
} else if (w->length <= (int64_t)(WTV_SECTOR_SIZE / 4) * (WTV_SECTOR_SIZE / 4) * WTV_BIGSECTOR_SIZE) {
w->depth = 2;
sector_bits = WTV_BIGSECTOR_BITS;
} else {
av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (%"PRIi64" bytes)\n", w->length);
return -1;
}
// determine the nb_sectors
nb_sectors = (int)(w->length >> sector_bits);
// pad sector of timeline
pad = (1 << sector_bits) - (w->length % (1 << sector_bits));
if (pad) {
nb_sectors++;
write_pad(pb, pad);
}
//write fat table
if (w->depth > 0) {
w->first_sector = write_fat_sector(s, start_pos, nb_sectors, sector_bits, w->depth);
} else {
w->first_sector = start_pos;
}
w->first_sector >>= WTV_SECTOR_BITS;
w->length |= 1ULL<<60;
if (sector_bits == WTV_SECTOR_BITS)
w->length |= 1ULL<<63;
return 0;
}
static int write_trailer(AVFormatContext *s)
{
WtvContext *wctx = s->priv_data;
AVIOContext *pb = s->pb;
int root_size;
int64_t sector_pos;
int64_t start_pos, file_end_pos;
if (finish_file(s, WTV_TIMELINE, wctx->timeline_start_pos) < 0)
return -1;
start_pos = avio_tell(pb);
write_table_entries_events(s);
if (finish_file(s, WTV_TIMELINE_TABLE_0_ENTRIES_EVENTS, start_pos) < 0)
return -1;
start_pos = avio_tell(pb);
write_table_entries_attrib(s);
if (finish_file(s, WTV_TABLE_0_ENTRIES_LEGACY_ATTRIB, start_pos) < 0)
return -1;
start_pos = avio_tell(pb);
write_table_redirector_legacy_attrib(s);
if (finish_file(s, WTV_TABLE_0_REDIRECTOR_LEGACY_ATTRIB, start_pos) < 0)
return -1;
start_pos = avio_tell(pb);
//FIXME: output timestamp, frame_nb pairs here.
if (finish_file(s, WTV_TABLE_0_ENTRIES_TIME, start_pos) < 0)
return -1;
// write root table
sector_pos = avio_tell(pb);
root_size = write_root_table(s, sector_pos);
file_end_pos = avio_tell(pb);
// update root value
avio_seek(pb, 0x30, SEEK_SET);
avio_wl32(pb, root_size);
avio_seek(pb, 4, SEEK_CUR);
avio_wl32(pb, sector_pos >> WTV_SECTOR_BITS);
avio_seek(pb, 0x5c, SEEK_SET);
avio_wl32(pb, file_end_pos >> WTV_SECTOR_BITS);
avio_flush(pb);
return 0;
}
AVOutputFormat ff_wtv_muxer = {
.name = "wtv",
.long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
.extensions = "wtv",
.priv_data_size = sizeof(WtvContext),
.audio_codec = CODEC_ID_MP2,
.video_codec = CODEC_ID_MPEG2VIDEO,
.write_header = write_header,
.write_packet = write_packet,
.write_trailer = write_trailer,
.codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags,
ff_codec_wav_tags, 0 },
};
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