7308439158
Since 596e5d4783, this is not necessary anymore. It also allows to
actually disable the flushing, improving write performance (but
possibly giving worse latency in real-time streaming).
Signed-off-by: Martin Storsjö <martin@martin.st>
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
|
|
* SSA/ASS muxer
|
|
* Copyright (c) 2008 Michael Niedermayer
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
|
|
typedef struct ASSContext{
|
|
unsigned int extra_index;
|
|
}ASSContext;
|
|
|
|
static int write_header(AVFormatContext *s)
|
|
{
|
|
ASSContext *ass = s->priv_data;
|
|
AVCodecContext *avctx= s->streams[0]->codec;
|
|
uint8_t *last= NULL;
|
|
|
|
if(s->nb_streams != 1 || avctx->codec_id != AV_CODEC_ID_SSA){
|
|
av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n");
|
|
return -1;
|
|
}
|
|
|
|
while(ass->extra_index < avctx->extradata_size){
|
|
uint8_t *p = avctx->extradata + ass->extra_index;
|
|
uint8_t *end= strchr(p, '\n');
|
|
if(!end) end= avctx->extradata + avctx->extradata_size;
|
|
else end++;
|
|
|
|
avio_write(s->pb, p, end-p);
|
|
ass->extra_index += end-p;
|
|
|
|
if(last && !memcmp(last, "[Events]", 8))
|
|
break;
|
|
last=p;
|
|
}
|
|
|
|
avio_flush(s->pb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
avio_write(s->pb, pkt->data, pkt->size);
|
|
return 0;
|
|
}
|
|
|
|
static int write_trailer(AVFormatContext *s)
|
|
{
|
|
ASSContext *ass = s->priv_data;
|
|
AVCodecContext *avctx= s->streams[0]->codec;
|
|
|
|
avio_write(s->pb, avctx->extradata + ass->extra_index,
|
|
avctx->extradata_size - ass->extra_index);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_ass_muxer = {
|
|
.name = "ass",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
|
|
.mime_type = "text/x-ssa",
|
|
.extensions = "ass,ssa",
|
|
.priv_data_size = sizeof(ASSContext),
|
|
.subtitle_codec = AV_CODEC_ID_SSA,
|
|
.write_header = write_header,
|
|
.write_packet = write_packet,
|
|
.write_trailer = write_trailer,
|
|
.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS,
|
|
};
|