mirror of
https://github.com/mstorsjo/fdk-aac.git
synced 2025-01-09 06:05:16 +01:00
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
|
/*************************** 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 */
|
||
|
|
|