Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 85 insertions, 0 deletions

diff --git a/libFDK/include/dct.h b/libFDK/include/dct.h
new file mode 100644
index 0000000..3ffacf5
--- /dev/null
+++ b/libFDK/include/dct.h
@@ -0,0 +1,85 @@
+/***************************  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