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/*
* 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 "avcodec.h"
#include "bytestream.h"
#include "dca_syncwords.h"
#include "libavutil/mem.h"
static int dca_core(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size,
int keyframe)
{
GetByteContext gb;
uint32_t syncword;
int core_size = 0;
bytestream2_init(&gb, buf, buf_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;
}
*poutbuf = (uint8_t *)buf;
if (core_size > 0 && core_size <= buf_size) {
*poutbuf_size = core_size;
} else {
*poutbuf_size = buf_size;
}
return 0;
}
AVBitStreamFilter ff_dca_core_bsf = {
.name = "dca_core",
.filter = dca_core,
};
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