98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/*
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* SubRip subtitle muxer
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* Copyright (c) 2012 Nicolas George <nicolas.george@normalesup.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/log.h"
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/* TODO: add options for:
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- character encoding;
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- LF / CRLF;
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- byte order mark.
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*/
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typedef struct SRTContext{
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unsigned index;
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} SRTContext;
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static int srt_write_header(AVFormatContext *avf)
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{
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if (avf->nb_streams != 1 ||
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avf->streams[0]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
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av_log(avf, AV_LOG_ERROR,
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"SRT supports only a single subtitles stream.\n");
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return AVERROR(EINVAL);
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}
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if (avf->streams[0]->codec->codec_id != AV_CODEC_ID_TEXT &&
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avf->streams[0]->codec->codec_id != AV_CODEC_ID_SUBRIP &&
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avf->streams[0]->codec->codec_id != AV_CODEC_ID_SRT) {
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av_log(avf, AV_LOG_ERROR,
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"Unsupported subtitles codec: %s\n",
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avcodec_get_name(avf->streams[0]->codec->codec_id));
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return AVERROR(EINVAL);
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}
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avpriv_set_pts_info(avf->streams[0], 64, 1, 1000);
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return 0;
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}
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static int srt_write_packet(AVFormatContext *avf, AVPacket *pkt)
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{
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SRTContext *srt = avf->priv_data;
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int write_ts = avf->streams[0]->codec->codec_id != AV_CODEC_ID_SRT;
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srt->index++;
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if (write_ts) {
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int64_t s = pkt->pts, e, d = pkt->duration;
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if (d <= 0)
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/* For backward compatibility, fallback to convergence_duration. */
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d = pkt->convergence_duration;
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if (s == AV_NOPTS_VALUE || d < 0) {
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av_log(avf, AV_LOG_ERROR, "Insufficient timestamps.\n");
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return AVERROR(EINVAL);
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}
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e = s + d;
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avio_printf(avf->pb, "%d\n%02d:%02d:%02d,%03d --> %02d:%02d:%02d,%03d\n",
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srt->index,
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(int)(s / 3600000), (int)(s / 60000) % 60,
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(int)(s / 1000) % 60, (int)(s % 1000),
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(int)(e / 3600000), (int)(e / 60000) % 60,
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(int)(e / 1000) % 60, (int)(e % 1000));
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}
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avio_write(avf->pb, pkt->data, pkt->size);
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if (write_ts)
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avio_write(avf->pb, "\n\n", 2);
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avio_flush(avf->pb);
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return 0;
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}
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AVOutputFormat ff_srt_muxer = {
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.name = "srt",
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
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.mime_type = "application/x-subrip",
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.extensions = "srt",
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.priv_data_size = sizeof(SRTContext),
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.write_header = srt_write_header,
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.write_packet = srt_write_packet,
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.flags = AVFMT_VARIABLE_FPS,
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.subtitle_codec = AV_CODEC_ID_SUBRIP,
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};
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