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