FFmpeg
4.4.4
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 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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#include <string.h>
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#include "
avcodec.h
"
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#include "
ass.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_decode_init
(
AVCodecContext
*avctx)
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{
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avctx->
subtitle_header
=
av_malloc
(avctx->
extradata_size
+ 1);
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if
(!avctx->
subtitle_header
)
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return
AVERROR
(ENOMEM);
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if
(avctx->
extradata_size
)
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memcpy(avctx->
subtitle_header
, avctx->
extradata
, avctx->
extradata_size
);
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avctx->
subtitle_header
[avctx->
extradata_size
] = 0;
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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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AVSubtitle
*
sub
=
data
;
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if
(avpkt->
size
<= 0)
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return
avpkt->
size
;
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sub
->rects =
av_malloc
(
sizeof
(*
sub
->rects));
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if
(!
sub
->rects)
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return
AVERROR
(ENOMEM);
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sub
->rects[0] =
av_mallocz
(
sizeof
(*
sub
->rects[0]));
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if
(!
sub
->rects[0])
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return
AVERROR
(ENOMEM);
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sub
->num_rects = 1;
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sub
->rects[0]->type =
SUBTITLE_ASS
;
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sub
->rects[0]->ass =
av_strdup
(avpkt->
data
);
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if
(!
sub
->rects[0]->ass)
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return
AVERROR
(ENOMEM);
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*got_sub_ptr = 1;
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return
avpkt->
size
;
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}
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#if CONFIG_SSA_DECODER
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AVCodec
ff_ssa_decoder
= {
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.
name
=
"ssa"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"ASS (Advanced SubStation Alpha) subtitle"
),
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.type =
AVMEDIA_TYPE_SUBTITLE
,
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.id =
AV_CODEC_ID_ASS
,
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.init =
ass_decode_init
,
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.decode =
ass_decode_frame
,
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};
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#endif
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#if CONFIG_ASS_DECODER
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AVCodec
ff_ass_decoder
= {
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.
name
=
"ass"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"ASS (Advanced SubStation Alpha) subtitle"
),
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.type =
AVMEDIA_TYPE_SUBTITLE
,
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.id =
AV_CODEC_ID_ASS
,
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.init =
ass_decode_init
,
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.decode =
ass_decode_frame
,
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};
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#endif
ff_ass_decoder
AVCodec ff_ass_decoder
ff_ssa_decoder
AVCodec ff_ssa_decoder
ass.h
av_cold
#define av_cold
Definition:
attributes.h:88
avcodec.h
Libavcodec external API header.
sub
static float sub(float src0, float src1)
Definition:
dnn_backend_native_layer_mathbinary.c:32
SUBTITLE_ASS
@ SUBTITLE_ASS
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition:
avcodec.h:2682
AV_CODEC_ID_ASS
@ AV_CODEC_ID_ASS
Definition:
codec_id.h:546
AVERROR
#define AVERROR(e)
Definition:
error.h:43
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition:
mem.c:237
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition:
mem.c:253
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition:
avutil.h:204
ass_decode_init
static av_cold int ass_decode_init(AVCodecContext *avctx)
Definition:
assdec.c:29
ass_decode_frame
static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition:
assdec.c:41
internal.h
common internal API header
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition:
internal.h:117
mem.h
Memory handling functions.
data
const char data[16]
Definition:
mxf.c:142
AVCodecContext
main external API structure.
Definition:
avcodec.h:536
AVCodecContext::subtitle_header_size
int subtitle_header_size
Definition:
avcodec.h:2017
AVCodecContext::subtitle_header
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition:
avcodec.h:2016
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition:
avcodec.h:637
AVCodecContext::extradata_size
int extradata_size
Definition:
avcodec.h:638
AVCodec
AVCodec.
Definition:
codec.h:197
AVCodec::name
const char * name
Name of the codec implementation.
Definition:
codec.h:204
AVPacket
This structure stores compressed data.
Definition:
packet.h:346
AVPacket::size
int size
Definition:
packet.h:370
AVPacket::data
uint8_t * data
Definition:
packet.h:369
AVSubtitle
Definition:
avcodec.h:2722
av_malloc
#define av_malloc(s)
Definition:
tableprint_vlc.h:31
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