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
, "%"PRId64
":", hour
);
43 avio_printf(pb
, "%02"PRId64
":%02"PRId64
".%03"PRId64
"", 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 .flags
= AVFMT_VARIABLE_FPS
| AVFMT_TS_NONSTRICT
,
97 .subtitle_codec
= AV_CODEC_ID_WEBVTT
,
98 .write_header
= webvtt_write_header
,
99 .write_packet
= webvtt_write_packet
,