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libavcodec
assdec.c
Go to the documentation of this file.
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/*
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* SSA/ASS decoder
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "
avcodec.h
"
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#include "
ass.h
"
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static
av_cold
int
ass_decode_init
(
AVCodecContext
*avctx)
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{
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avctx->
subtitle_header
=
av_malloc
(avctx->
extradata_size
);
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if
(!avctx->
extradata
)
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return
AVERROR
(ENOMEM);
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memcpy(avctx->
subtitle_header
, avctx->
extradata
, avctx->
extradata_size
);
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avctx->
subtitle_header_size
= avctx->
extradata_size
;
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return
0;
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}
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static
int
ass_decode_frame
(
AVCodecContext
*avctx,
void
*
data
,
int
*got_sub_ptr,
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AVPacket
*avpkt)
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{
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const
char
*ptr = avpkt->
data
;
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int
len
,
size
= avpkt->
size
;
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ff_ass_init
(data);
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while
(size > 0) {
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len =
ff_ass_add_rect
(data, ptr, 0, 0
/* FIXME: duration */
, 1);
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if
(len < 0)
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return
len
;
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ptr +=
len
;
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size -=
len
;
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}
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*got_sub_ptr = avpkt->
size
> 0;
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return
avpkt->
size
;
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}
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AVCodec
ff_ass_decoder
= {
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.
name
=
"ass"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Advanced SubStation Alpha subtitle"
),
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.type =
AVMEDIA_TYPE_SUBTITLE
,
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.id =
CODEC_ID_SSA
,
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.init =
ass_decode_init
,
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.decode =
ass_decode_frame
,
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};