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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.
*/
/************************************************************************/
/* */
/* Project:: */
/* $Author: beq07716 $*/
/* $Revision: 1000 $*/
/* $Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $*/
/* */
/************************************************************************/
/**********************************************************************************
INCLUDE FILES
***********************************************************************************/
#include "LVM_Types.h"
#include "LVM_Macros.h"
#include "VectorArithmetic.h"
/**********************************************************************************
FUNCTION DelayAllPass_32x32
***********************************************************************************/
void DelayAllPass_Sat_32x16To32( LVM_INT32 *delay, /* Delay buffer */
LVM_UINT16 size, /* Delay size */
LVM_INT16 coeff, /* All pass filter coefficient */
LVM_UINT16 DelayOffset, /* Simple delay offset */
LVM_UINT16 *pAllPassOffset, /* All pass filter delay offset */
LVM_INT32 *dst, /* Source/destination */
LVM_INT16 n) /* Number of samples */
{
LVM_INT16 i;
LVM_UINT16 AllPassOffset = *pAllPassOffset;
LVM_INT32 temp;
LVM_INT32 a,b,c;
for (i = 0; i < n; i++)
{
MUL32x16INTO32(delay[AllPassOffset], coeff, temp, 15)
a = temp;
b = delay[DelayOffset];
DelayOffset++;
c = a + b;
if ((((c ^ a) & (c ^ b)) >> 31) != 0) /* overflow / underflow */
{
if(a < 0)
{
c = 0x80000000l;
}
else
{
c = 0x7FFFFFFFl;
}
}
*dst = c;
dst++;
MUL32x16INTO32(c, -coeff, temp, 15)
a = temp;
b = delay[AllPassOffset];
c = a + b;
if ((((c ^ a) & (c ^ b)) >> 31)!=0) /* overflow / underflow */
{
if(a < 0)
{
c = 0x80000000l;
}
else
{
c = 0x7FFFFFFFl;
}
}
delay[AllPassOffset] = c;
AllPassOffset++;
/* Make the delay buffer a circular buffer */
if (DelayOffset >= size)
{
DelayOffset = 0;
}
if (AllPassOffset >= size)
{
AllPassOffset = 0;
}
}
/* Update the offset */
*pAllPassOffset = AllPassOffset;
return;
}
/**********************************************************************************/
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