mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
|
|
* SSA/ASS decoder
|
|
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "ass.h"
|
|
#include "ass_split.h"
|
|
|
|
static av_cold int ass_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->subtitle_header = av_malloc(avctx->extradata_size);
|
|
if (!avctx->extradata)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
|
|
avctx->subtitle_header_size = avctx->extradata_size;
|
|
avctx->priv_data = ff_ass_split(avctx->extradata);
|
|
return 0;
|
|
}
|
|
|
|
static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
|
|
AVPacket *avpkt)
|
|
{
|
|
const char *ptr = avpkt->data;
|
|
int len, size = avpkt->size;
|
|
|
|
while (size > 0) {
|
|
ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL);
|
|
int duration = dialog->end - dialog->start;
|
|
len = ff_ass_add_rect(data, ptr, 0, duration, 1);
|
|
if (len < 0)
|
|
return len;
|
|
ptr += len;
|
|
size -= len;
|
|
}
|
|
|
|
*got_sub_ptr = avpkt->size > 0;
|
|
return avpkt->size;
|
|
}
|
|
|
|
static int ass_decode_close(AVCodecContext *avctx)
|
|
{
|
|
ff_ass_split_free(avctx->priv_data);
|
|
avctx->priv_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_ass_decoder = {
|
|
.name = "ass",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = CODEC_ID_SSA,
|
|
.init = ass_decode_init,
|
|
.decode = ass_decode_frame,
|
|
.close = ass_decode_close,
|
|
};
|