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Diffstat (limited to 'src/devices/sound/fft.h')
-rw-r--r-- | src/devices/sound/fft.h | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/src/devices/sound/fft.h b/src/devices/sound/fft.h deleted file mode 100644 index a278b50a8c8..00000000000 --- a/src/devices/sound/fft.h +++ /dev/null @@ -1,82 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Justin Frankel -/* - WDL - fft.h - Copyright (C) 2006 and later Cockos Incorporated - - This software is provided 'as-is', without any express or implied - warranty. In no event will the authors be held liable for any damages - arising from the use of this software. - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it - freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - 3. This notice may not be removed or altered from any source distribution. - - - - This file defines the interface to the WDL FFT library. These routines are based on the - DJBFFT library, which are Copyright 1999 D. J. Bernstein, djb@pobox.com - - The DJB FFT web page is: http://cr.yp.to/djbfft.html - - - This file is modified from the original; it has been reformatted for 4-space - tabs. -*/ - -#ifndef WDL_FFT_H -#define WDL_FFT_H - -#ifdef __cplusplus -extern "C" { -#endif - -#ifndef WDL_FFT_REALSIZE -#define WDL_FFT_REALSIZE 8 -#endif - -#if WDL_FFT_REALSIZE == 4 -typedef float WDL_FFT_REAL; -#elif WDL_FFT_REALSIZE == 8 -typedef double WDL_FFT_REAL; -#else -#error invalid FFT item size -#endif - -typedef struct { - WDL_FFT_REAL re; - WDL_FFT_REAL im; -} WDL_FFT_COMPLEX; - -extern void WDL_fft_init(); - -extern void WDL_fft_complexmul(WDL_FFT_COMPLEX *dest, WDL_FFT_COMPLEX *src, int len); -extern void WDL_fft_complexmul2(WDL_FFT_COMPLEX *dest, WDL_FFT_COMPLEX *src, WDL_FFT_COMPLEX *src2, int len); -extern void WDL_fft_complexmul3(WDL_FFT_COMPLEX *destAdd, WDL_FFT_COMPLEX *src, WDL_FFT_COMPLEX *src2, int len); - -/* Expects WDL_FFT_COMPLEX input[0..len-1] scaled by 1.0/len, returns -WDL_FFT_COMPLEX output[0..len-1] order by WDL_fft_permute(len). */ -extern void WDL_fft(WDL_FFT_COMPLEX *, int len, int isInverse); - -/* Expects WDL_FFT_REAL input[0..len-1] scaled by 0.5/len, returns -WDL_FFT_COMPLEX output[0..len/2-1], for len >= 4 order by -WDL_fft_permute(len/2). Note that output[len/2].re is stored in -output[0].im. */ -extern void WDL_real_fft(WDL_FFT_REAL *, int len, int isInverse); - -extern int WDL_fft_permute(int fftsize, int idx); -extern int *WDL_fft_permute_tab(int fftsize); - -#ifdef __cplusplus -}; -#endif - -#endif
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