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authorDave Burke <daveburke@google.com>2012-04-17 09:51:45 -0700
committerDave Burke <daveburke@google.com>2012-04-17 23:04:43 -0700
commit9bf37cc9712506b2483650c82d3c41152337ef7e (patch)
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Fraunhofer AAC codec.
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
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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