diff options
Diffstat (limited to 'webrtc/modules/third_party/fft/fft.h')
-rw-r--r-- | webrtc/modules/third_party/fft/fft.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/webrtc/modules/third_party/fft/fft.h b/webrtc/modules/third_party/fft/fft.h new file mode 100644 index 0000000..f8f8b6f --- /dev/null +++ b/webrtc/modules/third_party/fft/fft.h @@ -0,0 +1,58 @@ +/* + * 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_THIRD_PARTY_FFT_FFT_H_ +#define MODULES_THIRD_PARTY_FFT_FFT_H_ + +#define FFT_MAXFFTSIZE 2048 +#define FFT_NFACTOR 11 + +typedef struct { + unsigned int SpaceAlloced; + unsigned int MaxPermAlloced; + double Tmp0[FFT_MAXFFTSIZE]; + double Tmp1[FFT_MAXFFTSIZE]; + double Tmp2[FFT_MAXFFTSIZE]; + double Tmp3[FFT_MAXFFTSIZE]; + int Perm[FFT_MAXFFTSIZE]; + int factor[FFT_NFACTOR]; + +} FFTstr; + +/* double precision routine */ + +int WebRtcIsac_Fftns(unsigned int ndim, + const int dims[], + double Re[], + double Im[], + int isign, + double scaling, + FFTstr* fftstate); + +#endif /* MODULES_THIRD_PARTY_FFT_FFT_H_ */ |