From 9bf37cc9712506b2483650c82d3c41152337ef7e Mon Sep 17 00:00:00 2001 From: Dave Burke Date: Tue, 17 Apr 2012 09:51:45 -0700 Subject: Fraunhofer AAC codec. License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5 --- libFDK/include/fft_rad2.h | 72 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 libFDK/include/fft_rad2.h (limited to 'libFDK/include/fft_rad2.h') diff --git a/libFDK/include/fft_rad2.h b/libFDK/include/fft_rad2.h new file mode 100644 index 0000000..07efc83 --- /dev/null +++ b/libFDK/include/fft_rad2.h @@ -0,0 +1,72 @@ +/*************************** Fraunhofer IIS FDK Tools ********************** + + (C) Copyright Fraunhofer IIS (2003) + 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): M. Lohwasser, M. Gayer + Description: + + 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 _FFT_RAD2_H +#define _FFT_RAD2_H + + +#include "common_fix.h" + +/** + * \brief Performe an inplace complex valued FFT of 2^n length + * + * \param x Input/Output data buffer. The input data must have at least 1 bit scale headroom. + * The values are interleaved, real/imag pairs. + * \param ldn log2 of FFT length + * \param trigdata Pointer to a sinetable of a length of at least (2^ldn)/2 sine values. + * \param trigDataSize length of the sinetable "trigdata". + */ +void dit_fft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata, const INT trigDataSize) ; + +/** + * \brief Performe an inplace complex valued inverse FFT of 2^n length + * + * \param x Input/Output data buffer. The input data must have at least 1 bit scale headroom. + * The values are interleaved, real/imag pairs. + * \param ldn log2 of FFT length + * \param trigdata Pointer to a sinetable of a length of at least (2^ldn)/2 sine values. + * \param trigDataSize length of the sinetable "trigdata". + */ +void dit_ifft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata, const INT trigDataSize) ; + +/* Rest of the world. */ + +#define SCALEFACTOR2048 10 +#define SCALEFACTOR1024 9 +#define SCALEFACTOR512 8 +#define SCALEFACTOR256 7 +#define SCALEFACTOR128 6 +#define SCALEFACTOR64 5 +#define SCALEFACTOR32 4 +#define SCALEFACTOR16 3 +#define SCALEFACTOR8 2 +#define SCALEFACTOR4 1 +#define SCALEFACTOR2 1 + +#endif /* _FFT_RAD2_H */ + -- cgit v1.2.3