FFmpeg
libavcodec
bsf
dca_core.c
Go to the documentation of this file.
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/*
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* Copyright (c) 2016 Paul B Mahol
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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 "
bsf.h
"
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#include "
bsf_internal.h
"
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#include "
bytestream.h
"
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#include "
dca_syncwords.h
"
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static
int
dca_core_filter
(
AVBSFContext
*
ctx
,
AVPacket
*
pkt
)
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{
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GetByteContext
gb;
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uint32_t syncword;
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int
core_size = 0,
ret
;
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ret
=
ff_bsf_get_packet_ref
(
ctx
,
pkt
);
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if
(
ret
< 0)
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return
ret
;
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bytestream2_init
(&gb,
pkt
->
data
,
pkt
->
size
);
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syncword = bytestream2_get_be32(&gb);
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bytestream2_skip
(&gb, 1);
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switch
(syncword) {
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case
DCA_SYNCWORD_CORE_BE
:
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core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1;
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break
;
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}
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if
(core_size > 0 && core_size <= pkt->
size
) {
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pkt
->
size
= core_size;
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}
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return
0;
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}
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static
const
enum
AVCodecID
codec_ids
[] = {
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AV_CODEC_ID_DTS
,
AV_CODEC_ID_NONE
,
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};
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const
FFBitStreamFilter
ff_dca_core_bsf
= {
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.
p
.
name
=
"dca_core"
,
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.p.codec_ids =
codec_ids
,
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.filter =
dca_core_filter
,
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};
bsf_internal.h
GetByteContext
Definition:
bytestream.h:33
AVBitStreamFilter::name
const char * name
Definition:
bsf.h:112
dca_core_filter
static int dca_core_filter(AVBSFContext *ctx, AVPacket *pkt)
Definition:
dca_core.c:26
AVPacket::data
uint8_t * data
Definition:
packet.h:539
AVBSFContext
The bitstream filter state.
Definition:
bsf.h:68
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition:
bytestream.h:168
bsf.h
pkt
AVPacket * pkt
Definition:
movenc.c:60
ctx
AVFormatContext * ctx
Definition:
movenc.c:49
dca_syncwords.h
FFBitStreamFilter
Definition:
bsf_internal.h:27
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition:
codec_id.h:49
FFBitStreamFilter::p
AVBitStreamFilter p
The public AVBitStreamFilter.
Definition:
bsf_internal.h:31
DCA_SYNCWORD_CORE_BE
#define DCA_SYNCWORD_CORE_BE
Definition:
dca_syncwords.h:22
AVPacket::size
int size
Definition:
packet.h:540
AV_CODEC_ID_DTS
@ AV_CODEC_ID_DTS
Definition:
codec_id.h:450
size
int size
Definition:
twinvq_data.h:10344
codec_ids
static enum AVCodecID codec_ids[]
Definition:
dca_core.c:53
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition:
codec_id.h:50
ret
ret
Definition:
filter_design.txt:187
AVPacket
This structure stores compressed data.
Definition:
packet.h:516
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition:
bytestream.h:137
ff_bsf_get_packet_ref
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition:
bsf.c:256
ff_dca_core_bsf
const FFBitStreamFilter ff_dca_core_bsf
Definition:
dca_core.c:57
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