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/*************************** Fraunhofer IIS FDK Tools **********************
(C) Copyright Fraunhofer IIS (2009)
All Rights Reserved
Please be advised that this software and/or program delivery is
Confidential Information of Fraunhofer and subject to and covered by the
Fraunhofer IIS Software Evaluation Agreement
between Google Inc. and Fraunhofer
effective and in full force since March 1, 2012.
You may use this software and/or program only under the terms and
conditions described in the above mentioned Fraunhofer IIS Software
Evaluation Agreement. Any other and/or further use requires a separate agreement.
$Id$
Author(s):
Description: Library functions to calculate standard DCTs. This will most
likely be replaced by hand-optimized functions for the specific
target processor.
This software and/or program is protected by copyright law and international
treaties. Any reproduction or distribution of this software and/or program,
or any portion of it, may result in severe civil and criminal penalties, and
will be prosecuted to the maximum extent possible under law.
******************************************************************************/
#ifndef __dct_H
#define __dct_H
#include "common_fix.h"
/**
* \brief Calculate DCT type II of given length. The DCT IV is
* calculated by a complex FFT, with some pre and post twiddeling.
* A factor of sqrt(2/(N-1)) is NOT applied.
* \param pDat pointer to input/output data (in place processing).
* \param size size of pDat.
* \param pDat_e pointer to an integer containing the exponent of the data
* referenced by pDat. The exponent is updated accordingly.
*/
void dct_II(FIXP_DBL *pDat, FIXP_DBL *tmp, int size, int *pDat_e);
/**
* \brief Calculate DCT type III of given length. The DCT IV is
* calculated by a complex FFT, with some pre and post twiddeling.
* Note that the factor 0.5 for the sum term x[0] is 1.0 instead of 0.5.
* A factor of sqrt(2/N) is NOT applied.
* \param pDat pointer to input/output data (in place processing).
* \param size size of pDat.
* \param pDat_e pointer to an integer containing the exponent of the data
* referenced by pDat. The exponent is updated accordingly.
*/
void dct_III(FIXP_DBL *pDat, FIXP_DBL *tmp, int size, int *pDat_e);
/**
* \brief Calculate DCT type IV of given length. The DCT IV is
* calculated by a complex FFT, with some pre and post twiddeling.
* A factor of sqrt(2/N) is NOT applied.
* \param pDat pointer to input/output data (in place processing).
* \param size size of pDat.
* \param pDat_e pointer to an integer containing the exponent of the data
* referenced by pDat. The exponent is updated accordingly.
*/
void dct_IV(FIXP_DBL *pDat,int size, int *pDat_e);
/**
* \brief Calculate DST type IV of given length. The DST IV is
* calculated by a complex FFT, with some pre and post twiddeling.
* A factor of sqrt(2/N) is NOT applied.
* \param pDat pointer to input/output data (in place processing).
* \param size size of pDat.
* \param pDat_e pointer to an integer containing the exponent of the data
* referenced by pDat. The exponent is updated accordingly.
*/
void dst_IV(FIXP_DBL *pDat,int size, int *pDat_e);
#endif
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