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4bf90e095b
To make it consistent with other muxers. The user can still control the generic flushing behaviour after write_header (same way as after packets) using the -flush_packets option, the default typically means to flush unless a non-streamed file output is used. Therefore this change should have no adverse effect on streaming, even if it is assumed that the first packet has a clean buffer, so small seekbacks within the output buffer work even when the IO context is not seekable. Signed-off-by: Marton Balint <cus@passwd.hu>
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
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* MicroDVD subtitle muxer
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.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 <inttypes.h>
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#include "avformat.h"
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#include "internal.h"
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static int microdvd_write_header(struct AVFormatContext *s)
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{
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AVCodecParameters *par = s->streams[0]->codecpar;
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AVRational framerate = s->streams[0]->avg_frame_rate;
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if (s->nb_streams != 1 || par->codec_id != AV_CODEC_ID_MICRODVD) {
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av_log(s, AV_LOG_ERROR, "Exactly one MicroDVD stream is needed.\n");
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return -1;
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}
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if (par->extradata && par->extradata_size > 0) {
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avio_write(s->pb, "{DEFAULT}{}", 11);
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avio_write(s->pb, par->extradata, par->extradata_size);
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avio_w8(s->pb, '\n');
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}
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avpriv_set_pts_info(s->streams[0], 64, framerate.num, framerate.den);
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return 0;
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}
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static int microdvd_write_packet(AVFormatContext *avf, AVPacket *pkt)
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{
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avio_printf(avf->pb, "{%"PRId64"}", pkt->pts);
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if (pkt->duration < 0)
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avio_write(avf->pb, "{}", 2);
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else
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avio_printf(avf->pb, "{%"PRId64"}", pkt->pts + pkt->duration);
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avio_write(avf->pb, pkt->data, pkt->size);
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avio_w8(avf->pb, '\n');
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return 0;
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}
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AVOutputFormat ff_microdvd_muxer = {
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.name = "microdvd",
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.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
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.mime_type = "text/x-microdvd",
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.extensions = "sub",
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.write_header = microdvd_write_header,
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.write_packet = microdvd_write_packet,
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.flags = AVFMT_NOTIMESTAMPS,
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.subtitle_codec = AV_CODEC_ID_MICRODVD,
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};
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