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/*
* Copyrightm (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.
*/
#ifndef __ECHO_SUPPRESSOR_H__
#define __ECHO_SUPPRESSOR_H__
#include <stdint.h>
class EchoSuppressor
{
public:
// The sampleCount must be power of 2.
EchoSuppressor(int sampleCount, int tailLength);
~EchoSuppressor();
void run(int16_t *playbacked, int16_t *recorded);
private:
int mShift;
int mScale;
int mSampleCount;
int mWindowSize;
int mTailLength;
int mRecordLength;
int mRecordOffset;
uint16_t *mXs;
uint32_t *mXSums;
uint32_t *mX2Sums;
uint16_t *mXRecords;
uint32_t mYSum;
uint32_t mY2Sum;
uint32_t *mYRecords;
uint32_t *mY2Records;
uint32_t *mXYSums;
uint32_t *mXYRecords;
int32_t mLastX;
int32_t mLastY;
float mWeight;
};
#endif
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