14b43beb7c
TBR=niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/915006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@2963 4adac7df-926f-26a2-2b94-8c16560cd09d
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/*
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* Copyright (c) 2012 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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#ifndef WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
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#define WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
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#include "typedefs.h"
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struct RealFFT;
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef int (*RealForwardFFT)(struct RealFFT* self,
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const int16_t* data_in,
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int16_t* data_out);
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typedef int (*RealInverseFFT)(struct RealFFT* self,
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const int16_t* data_in,
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int16_t* data_out);
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extern RealForwardFFT WebRtcSpl_RealForwardFFT;
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extern RealInverseFFT WebRtcSpl_RealInverseFFT;
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struct RealFFT* WebRtcSpl_CreateRealFFT(int order);
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void WebRtcSpl_FreeRealFFT(struct RealFFT* self);
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// TODO(kma): Implement FFT functions for real signals.
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// Compute the forward FFT for a complex signal of length 2^order.
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// Input Arguments:
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// self - pointer to preallocated and initialized FFT specification structure.
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// data_in - the input signal.
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//
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// Output Arguments:
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// data_out - the output signal; must be different to data_in.
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//
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// Return Value:
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// 0 - FFT calculation is successful.
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// -1 - Error
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//
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int WebRtcSpl_RealForwardFFTC(struct RealFFT* self,
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const int16_t* data_in,
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int16_t* data_out);
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#if (defined WEBRTC_DETECT_ARM_NEON) || (defined WEBRTC_ARCH_ARM_NEON)
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int WebRtcSpl_RealForwardFFTNeon(struct RealFFT* self,
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const int16_t* data_in,
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int16_t* data_out);
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#endif
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// Compute the inverse FFT for a complex signal of length 2^order.
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// Input Arguments:
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// self - pointer to preallocated and initialized FFT specification structure.
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// data_in - the input signal.
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//
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// Output Arguments:
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// data_out - the output signal; must be different to data_in.
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//
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// Return Value:
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// 0 or a positive number - a value that the elements in the |data_out| should
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// be shifted left with in order to get correct
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// physical values.
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// -1 - Error
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int WebRtcSpl_RealInverseFFTC(struct RealFFT* self,
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const int16_t* data_in,
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int16_t* data_out);
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#if (defined WEBRTC_DETECT_ARM_NEON) || (defined WEBRTC_ARCH_ARM_NEON)
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int WebRtcSpl_RealInverseFFTNeon(struct RealFFT* self,
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const int16_t* data_in,
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int16_t* data_out);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
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