2 * SubRip subtitle muxer
3 * Copyright (c) 2012 Nicolas George <nicolas.george@normalesup.org>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/log.h"
25 #include "libavutil/intreadwrite.h"
27 /* TODO: add options for:
33 typedef struct SRTContext{
37 static int srt_write_header(AVFormatContext *avf)
39 SRTContext *srt = avf->priv_data;
41 if (avf->nb_streams != 1 ||
42 avf->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
43 av_log(avf, AV_LOG_ERROR,
44 "SRT supports only a single subtitles stream.\n");
45 return AVERROR(EINVAL);
47 if (avf->streams[0]->codecpar->codec_id != AV_CODEC_ID_TEXT &&
48 avf->streams[0]->codecpar->codec_id != AV_CODEC_ID_SUBRIP) {
49 av_log(avf, AV_LOG_ERROR,
50 "Unsupported subtitles codec: %s\n",
51 avcodec_get_name(avf->streams[0]->codecpar->codec_id));
52 return AVERROR(EINVAL);
54 avpriv_set_pts_info(avf->streams[0], 64, 1, 1000);
59 static int srt_write_packet(AVFormatContext *avf, AVPacket *pkt)
61 SRTContext *srt = avf->priv_data;
63 int64_t s = pkt->pts, e, d = pkt->duration;
65 int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
68 p = av_packet_get_side_data(pkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
69 if (p && size == 16) {
76 if (s == AV_NOPTS_VALUE || d < 0) {
77 av_log(avf, AV_LOG_WARNING,
78 "Insufficient timestamps in event number %d.\n", srt->index);
82 avio_printf(avf->pb, "%d\n%02d:%02d:%02d,%03d --> %02d:%02d:%02d,%03d",
84 (int)(s / 3600000), (int)(s / 60000) % 60,
85 (int)(s / 1000) % 60, (int)(s % 1000),
86 (int)(e / 3600000), (int)(e / 60000) % 60,
87 (int)(e / 1000) % 60, (int)(e % 1000));
89 avio_printf(avf->pb, " X1:%03d X2:%03d Y1:%03d Y2:%03d",
91 avio_printf(avf->pb, "\n");
93 avio_write(avf->pb, pkt->data, pkt->size);
94 avio_write(avf->pb, "\n\n", 2);
99 const AVOutputFormat ff_srt_muxer = {
101 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
102 .mime_type = "application/x-subrip",
104 .priv_data_size = sizeof(SRTContext),
105 .write_header = srt_write_header,
106 .write_packet = srt_write_packet,
107 .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
108 .subtitle_codec = AV_CODEC_ID_SUBRIP,