48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
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/*
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* Copyright (c) 2019 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 MODULES_AUDIO_PROCESSING_NS_NS_FFT_H_
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#define MODULES_AUDIO_PROCESSING_NS_NS_FFT_H_
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#include <vector>
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#include "array_view.h"
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#include "ns_common.h"
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namespace webrtc {
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// Wrapper class providing 256 point FFT functionality.
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class NrFft {
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public:
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NrFft();
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NrFft(const NrFft &) = delete;
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NrFft &operator=(const NrFft &) = delete;
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// Transforms the signal from time to frequency domain.
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void Fft(rtc::ArrayView<float, kFftSize> time_data,
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rtc::ArrayView<float, kFftSize> real,
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rtc::ArrayView<float, kFftSize> imag);
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// Transforms the signal from frequency to time domain.
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void Ifft(rtc::ArrayView<const float> real,
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rtc::ArrayView<const float> imag,
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rtc::ArrayView<float> time_data);
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private:
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std::vector<size_t> bit_reversal_state_;
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std::vector<float> tables_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_NS_NS_FFT_H_
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