62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2016 Paul B Mahol
|
||
|
|
*
|
||
|
|
* 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 "bsf.h"
|
||
|
|
#include "bsf_internal.h"
|
||
|
|
#include "bytestream.h"
|
||
|
|
#include "dca_syncwords.h"
|
||
|
|
|
||
|
|
static int dca_core_filter(AVBSFContext *ctx, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
GetByteContext gb;
|
||
|
|
uint32_t syncword;
|
||
|
|
int core_size = 0, ret;
|
||
|
|
|
||
|
|
ret = ff_bsf_get_packet_ref(ctx, pkt);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
bytestream2_init(&gb, pkt->data, pkt->size);
|
||
|
|
syncword = bytestream2_get_be32(&gb);
|
||
|
|
bytestream2_skip(&gb, 1);
|
||
|
|
|
||
|
|
switch (syncword) {
|
||
|
|
case DCA_SYNCWORD_CORE_BE:
|
||
|
|
core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (core_size > 0 && core_size <= pkt->size) {
|
||
|
|
pkt->size = core_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const enum AVCodecID codec_ids[] = {
|
||
|
|
AV_CODEC_ID_DTS, AV_CODEC_ID_NONE,
|
||
|
|
};
|
||
|
|
|
||
|
|
const AVBitStreamFilter ff_dca_core_bsf = {
|
||
|
|
.name = "dca_core",
|
||
|
|
.filter = dca_core_filter,
|
||
|
|
.codec_ids = codec_ids,
|
||
|
|
};
|