diff options
Diffstat (limited to 'libavformat/webvttenc.c')
-rw-r--r-- | libavformat/webvttenc.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/libavformat/webvttenc.c b/libavformat/webvttenc.c new file mode 100644 index 0000000..bd19a83 --- /dev/null +++ b/libavformat/webvttenc.c @@ -0,0 +1,99 @@ +/* + * 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, "%"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]; + AVIOContext *pb = ctx->pb; + + avpriv_set_pts_info(s, 64, 1, 1000); + + avio_printf(pb, "WEBVTT\n"); + avio_flush(pb); + + 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", + .subtitle_codec = AV_CODEC_ID_WEBVTT, + .write_header = webvtt_write_header, + .write_packet = webvtt_write_packet, +}; |