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https://git.ffmpeg.org/ffmpeg.git
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e56b098410
This way we don't abort in the middle of remuxing, just warn about an event ignored. The index increment is moved to make sure the output numbers still make sense.
102 lines
3.4 KiB
C
102 lines
3.4 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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SRTContext *srt = avf->priv_data;
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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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srt->index = 1;
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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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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_WARNING,
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"Insufficient timestamps in event number %d.\n", srt->index);
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return 0;
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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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srt->index++;
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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 | AVFMT_TS_NONSTRICT,
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.subtitle_codec = AV_CODEC_ID_SUBRIP,
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};
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