59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the ../../../LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*--------------------------------*-C-*---------------------------------*
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* File:
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* fftn.h
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* ---------------------------------------------------------------------*
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* Re[]: real value array
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* Im[]: imaginary value array
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* nTotal: total number of complex values
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* nPass: number of elements involved in this pass of transform
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* nSpan: nspan/nPass = number of bytes to increment pointer
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* in Re[] and Im[]
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* isign: exponent: +1 = forward -1 = reverse
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* scaling: normalizing constant by which the final result is *divided*
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* scaling == -1, normalize by total dimension of the transform
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* scaling < -1, normalize by the square-root of the total dimension
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*
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* ----------------------------------------------------------------------
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* See the comments in the code for correct usage!
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*/
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#ifndef MODULES_THIRD_PARTY_FFT_FFT_H_
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#define MODULES_THIRD_PARTY_FFT_FFT_H_
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#define FFT_MAXFFTSIZE 2048
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#define FFT_NFACTOR 11
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typedef struct {
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unsigned int SpaceAlloced;
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unsigned int MaxPermAlloced;
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double Tmp0[FFT_MAXFFTSIZE];
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double Tmp1[FFT_MAXFFTSIZE];
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double Tmp2[FFT_MAXFFTSIZE];
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double Tmp3[FFT_MAXFFTSIZE];
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int Perm[FFT_MAXFFTSIZE];
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int factor[FFT_NFACTOR];
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} FFTstr;
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/* double precision routine */
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int WebRtcIsac_Fftns(unsigned int ndim,
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const int dims[],
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double Re[],
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double Im[],
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int isign,
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double scaling,
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FFTstr* fftstate);
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#endif /* MODULES_THIRD_PARTY_FFT_FFT_H_ */
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