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/*
* Copyright (C) 2004-2010 NXP Software
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**********************************************************************************
$Author: beq07716 $
$Revision: 1000 $
$Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $
***********************************************************************************/
/**********************************************************************************
INCLUDE FILES
***********************************************************************************/
#include "VectorArithmetic.h"
/**********************************************************************************
FUNCTION DelayMix_16x16
***********************************************************************************/
void DelayMix_16x16(const LVM_INT16 *src, /* Source 1, to be delayed */
LVM_INT16 *delay, /* Delay buffer */
LVM_INT16 size, /* Delay size */
LVM_INT16 *dst, /* Source/destination */
LVM_INT16 *pOffset, /* Delay offset */
LVM_INT16 n) /* Number of stereo samples */
{
LVM_INT16 i;
LVM_INT16 Offset = *pOffset;
LVM_INT16 temp;
for (i=0; i<n; i++)
{
/* Left channel */
temp = (LVM_INT16)((LVM_UINT32)((LVM_INT32)(*dst) + (LVM_INT32)delay[Offset]) >> 1);
*dst = temp;
dst++;
delay[Offset] = *src;
Offset++;
src++;
/* Right channel */
temp = (LVM_INT16)((LVM_UINT32)((LVM_INT32)(*dst) - (LVM_INT32)delay[Offset]) >> 1);
*dst = temp;
dst++;
delay[Offset] = *src;
Offset++;
src++;
/* Make the reverb delay buffer a circular buffer */
if (Offset >= size)
{
Offset = 0;
}
}
/* Update the offset */
*pOffset = Offset;
return;
}
/**********************************************************************************/
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