38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
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/*
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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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// TODO(andrew): documentation.
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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(andrew): This currently functions exactly the same as ComplexFFT().
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// Manage the surrounding operations (ComplexBitReverse etc) here instead.
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//
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// data must be of length 2^(order + 1) to hold the complex output.
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int WebRtcSpl_RealForwardFFT(struct RealFFT* self, int16_t* data);
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int WebRtcSpl_RealInverseFFT(struct RealFFT* self, int16_t* data);
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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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