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libavcodec
assenc.c
Go to the documentation of this file.
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/*
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* SSA/ASS encoder
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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 <string.h>
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#include "
avcodec.h
"
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#include "
libavutil/avstring.h
"
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#include "
libavutil/internal.h
"
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#include "
libavutil/mem.h
"
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static
av_cold
int
ass_encode_init
(
AVCodecContext
*avctx)
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{
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avctx->
extradata
=
av_malloc
(avctx->
subtitle_header_size
);
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if
(!avctx->
extradata
)
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return
AVERROR
(ENOMEM);
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memcpy(avctx->
extradata
, avctx->
subtitle_header
, avctx->
subtitle_header_size
);
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avctx->
extradata_size
= avctx->
subtitle_header_size
;
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return
0;
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}
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static
int
ass_encode_frame
(
AVCodecContext
*avctx,
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unsigned
char
*buf,
int
bufsize,
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const
AVSubtitle
*sub)
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{
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int
i,
len
, total_len = 0;
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for
(i=0; i<sub->
num_rects
; i++) {
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if
(sub->
rects
[i]->
type
!=
SUBTITLE_ASS
) {
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av_log
(avctx,
AV_LOG_ERROR
,
"Only SUBTITLE_ASS type supported.\n"
);
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return
-1;
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}
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len =
av_strlcpy
(buf+total_len, sub->
rects
[i]->
ass
, bufsize-total_len);
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if
(len > bufsize-total_len-1) {
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av_log
(avctx,
AV_LOG_ERROR
,
"Buffer too small for ASS event.\n"
);
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return
-1;
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}
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total_len +=
len
;
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}
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return
total_len;
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}
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AVCodec
ff_ass_encoder
= {
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.
name
=
"ass"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"SSA (SubStation Alpha) subtitle"
),
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.type =
AVMEDIA_TYPE_SUBTITLE
,
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.id =
AV_CODEC_ID_SSA
,
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.init =
ass_encode_init
,
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.encode_sub =
ass_encode_frame
,
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};
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