2 * Copyright (c) 2013 Matthew Heaney
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * WebVTT subtitle muxer
24 * @see http://dev.w3.org/html5/webvtt/
30 static void webvtt_write_time(AVIOContext *pb, int64_t millisec)
32 int64_t sec, min, hour;
33 sec = millisec / 1000;
34 millisec -= 1000 * sec;
41 avio_printf(pb, "%ld:", hour);
43 avio_printf(pb, "%02ld:%02ld.%03ld", min, sec, millisec);
46 static int webvtt_write_header(AVFormatContext *ctx)
48 AVStream *s = ctx->streams[0];
49 AVIOContext *pb = ctx->pb;
51 avpriv_set_pts_info(s, 64, 1, 1000);
53 avio_printf(pb, "WEBVTT\n");
59 static int webvtt_write_packet(AVFormatContext *ctx, AVPacket *pkt)
61 AVIOContext *pb = ctx->pb;
62 int id_size, settings_size;
63 uint8_t *id, *settings;
65 avio_printf(pb, "\n");
67 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
70 if (id && id_size > 0)
71 avio_printf(pb, "%.*s\n", id_size, id);
73 webvtt_write_time(pb, pkt->pts);
74 avio_printf(pb, " --> ");
75 webvtt_write_time(pb, pkt->pts + pkt->duration);
77 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
80 if (settings && settings_size > 0)
81 avio_printf(pb, " %.*s", settings_size, settings);
83 avio_printf(pb, "\n");
85 avio_write(pb, pkt->data, pkt->size);
86 avio_printf(pb, "\n");
91 AVOutputFormat ff_webvtt_muxer = {
93 .long_name = NULL_IF_CONFIG_SMALL("WebVTT subtitle"),
95 .mime_type = "text/vtt",
96 .subtitle_codec = AV_CODEC_ID_WEBVTT,
97 .write_header = webvtt_write_header,
98 .write_packet = webvtt_write_packet,