chromium/third_party/webrtc/common_audio/signal_processing/real_fft.c

/*
 *  Copyright (c) 2012 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.
 */

#include "common_audio/signal_processing/include/real_fft.h"

#include <stdlib.h>

#include "common_audio/signal_processing/include/signal_processing_library.h"

struct RealFFT { … };

struct RealFFT* WebRtcSpl_CreateRealFFT(int order) { … }

void WebRtcSpl_FreeRealFFT(struct RealFFT* self) { … }

// The C version FFT functions (i.e. WebRtcSpl_RealForwardFFT and
// WebRtcSpl_RealInverseFFT) are real-valued FFT wrappers for complex-valued
// FFT implementation in SPL.

int WebRtcSpl_RealForwardFFT(struct RealFFT* self,
                             const int16_t* real_data_in,
                             int16_t* complex_data_out) { … }

int WebRtcSpl_RealInverseFFT(struct RealFFT* self,
                             const int16_t* complex_data_in,
                             int16_t* real_data_out) { … }