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97 lines
3.3 KiB
97 lines
3.3 KiB
/* |
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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 | AVFMT_TS_NONSTRICT, |
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.subtitle_codec = AV_CODEC_ID_SUBRIP, |
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};
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