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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>
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*
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* Copyright (c) 2013 Matthew Heaney
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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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/**
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* @file
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* WebVTT subtitle muxer
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* @see http://dev.w3.org/html5/webvtt/
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*/
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#include "avformat.h"
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#include "internal.h"
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static void webvtt_write_time(AVIOContext *pb, int64_t millisec)
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{
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int64_t sec, min, hour;
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sec = millisec / 1000;
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millisec -= 1000 * sec;
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min = sec / 60;
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sec -= 60 * min;
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hour = min / 60;
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min -= 60 * hour;
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if (hour > 0)
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avio_printf(pb, "%02"PRId64":", hour);
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avio_printf(pb, "%02"PRId64":%02"PRId64".%03"PRId64"", min, sec, millisec);
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}
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static int webvtt_write_header(AVFormatContext *ctx)
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{
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AVStream *s = ctx->streams[0];
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AVCodecParameters *par = ctx->streams[0]->codecpar;
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AVIOContext *pb = ctx->pb;
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if (ctx->nb_streams != 1 || par->codec_id != AV_CODEC_ID_WEBVTT) {
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av_log(ctx, AV_LOG_ERROR, "Exactly one WebVTT stream is needed.\n");
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return AVERROR(EINVAL);
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}
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avpriv_set_pts_info(s, 64, 1, 1000);
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avio_printf(pb, "WEBVTT\n");
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return 0;
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}
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static int webvtt_write_packet(AVFormatContext *ctx, AVPacket *pkt)
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{
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AVIOContext *pb = ctx->pb;
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int id_size, settings_size;
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uint8_t *id, *settings;
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avio_printf(pb, "\n");
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id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
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&id_size);
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if (id && id_size > 0)
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avio_printf(pb, "%.*s\n", id_size, id);
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webvtt_write_time(pb, pkt->pts);
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avio_printf(pb, " --> ");
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webvtt_write_time(pb, pkt->pts + pkt->duration);
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settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
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&settings_size);
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if (settings && settings_size > 0)
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avio_printf(pb, " %.*s", settings_size, settings);
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avio_printf(pb, "\n");
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avio_write(pb, pkt->data, pkt->size);
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avio_printf(pb, "\n");
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return 0;
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}
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AVOutputFormat ff_webvtt_muxer = {
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.name = "webvtt",
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.long_name = NULL_IF_CONFIG_SMALL("WebVTT subtitle"),
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.extensions = "vtt",
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.mime_type = "text/vtt",
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.flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
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.subtitle_codec = AV_CODEC_ID_WEBVTT,
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.write_header = webvtt_write_header,
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.write_packet = webvtt_write_packet,
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};
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