/***************************  Fraunhofer IIS FDK Tools  **********************

                        (C) Copyright Fraunhofer IIS (2009)
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   $Id$
   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