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