106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2013 Matthew Heaney
|
||
|
|
*
|
||
|
|
* 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
|
||
|
|
* WebVTT subtitle muxer
|
||
|
|
* @see http://dev.w3.org/html5/webvtt/
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "internal.h"
|
||
|
|
|
||
|
|
static void webvtt_write_time(AVIOContext *pb, int64_t millisec)
|
||
|
|
{
|
||
|
|
int64_t sec, min, hour;
|
||
|
|
sec = millisec / 1000;
|
||
|
|
millisec -= 1000 * sec;
|
||
|
|
min = sec / 60;
|
||
|
|
sec -= 60 * min;
|
||
|
|
hour = min / 60;
|
||
|
|
min -= 60 * hour;
|
||
|
|
|
||
|
|
if (hour > 0)
|
||
|
|
avio_printf(pb, "%02"PRId64":", hour);
|
||
|
|
|
||
|
|
avio_printf(pb, "%02"PRId64":%02"PRId64".%03"PRId64"", min, sec, millisec);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int webvtt_write_header(AVFormatContext *ctx)
|
||
|
|
{
|
||
|
|
AVStream *s = ctx->streams[0];
|
||
|
|
AVCodecParameters *par = ctx->streams[0]->codecpar;
|
||
|
|
AVIOContext *pb = ctx->pb;
|
||
|
|
|
||
|
|
if (ctx->nb_streams != 1 || par->codec_id != AV_CODEC_ID_WEBVTT) {
|
||
|
|
av_log(ctx, AV_LOG_ERROR, "Exactly one WebVTT stream is needed.\n");
|
||
|
|
return AVERROR(EINVAL);
|
||
|
|
}
|
||
|
|
|
||
|
|
avpriv_set_pts_info(s, 64, 1, 1000);
|
||
|
|
|
||
|
|
avio_printf(pb, "WEBVTT\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int webvtt_write_packet(AVFormatContext *ctx, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
AVIOContext *pb = ctx->pb;
|
||
|
|
int id_size, settings_size;
|
||
|
|
uint8_t *id, *settings;
|
||
|
|
|
||
|
|
avio_printf(pb, "\n");
|
||
|
|
|
||
|
|
id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
|
||
|
|
&id_size);
|
||
|
|
|
||
|
|
if (id && id_size > 0)
|
||
|
|
avio_printf(pb, "%.*s\n", id_size, id);
|
||
|
|
|
||
|
|
webvtt_write_time(pb, pkt->pts);
|
||
|
|
avio_printf(pb, " --> ");
|
||
|
|
webvtt_write_time(pb, pkt->pts + pkt->duration);
|
||
|
|
|
||
|
|
settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
|
||
|
|
&settings_size);
|
||
|
|
|
||
|
|
if (settings && settings_size > 0)
|
||
|
|
avio_printf(pb, " %.*s", settings_size, settings);
|
||
|
|
|
||
|
|
avio_printf(pb, "\n");
|
||
|
|
|
||
|
|
avio_write(pb, pkt->data, pkt->size);
|
||
|
|
avio_printf(pb, "\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVOutputFormat ff_webvtt_muxer = {
|
||
|
|
.name = "webvtt",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("WebVTT subtitle"),
|
||
|
|
.extensions = "vtt",
|
||
|
|
.mime_type = "text/vtt",
|
||
|
|
.flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
|
||
|
|
.subtitle_codec = AV_CODEC_ID_WEBVTT,
|
||
|
|
.write_header = webvtt_write_header,
|
||
|
|
.write_packet = webvtt_write_packet,
|
||
|
|
};
|