modules/audio_processing/aecm/aecm_core.h - external/webrtc/stable/src - Git at Google

 /*
  *  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.
  */

 // Performs echo control (suppression) with fft routines in fixed-point

 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AECM_AECM_CORE_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AECM_AECM_CORE_H_

 #include "typedefs.h"
 #include "signal_processing_library.h"

 #include "aecm_defines.h"

 #ifdef _MSC_VER // visual c++
 #define ALIGN8_BEG __declspec(align(8))
 #define ALIGN8_END
 #else // gcc or icc
 #define ALIGN8_BEG
 #define ALIGN8_END __attribute__((aligned(8)))
 #endif

 extern const WebRtc_Word16 WebRtcAecm_kSqrtHanning[] ALIGN8_END;

 typedef struct {
     WebRtc_Word16 real;
     WebRtc_Word16 imag;
 } complex16_t;

 typedef struct
 {
     int farBufWritePos;
     int farBufReadPos;
     int knownDelay;
     int lastKnownDelay;
     int firstVAD; // Parameter to control poorly initialized channels

     void *farFrameBuf;
     void *nearNoisyFrameBuf;
     void *nearCleanFrameBuf;
     void *outFrameBuf;

     WebRtc_Word16 farBuf[FAR_BUF_LEN];

     WebRtc_Word16 mult;
     WebRtc_UWord32 seed;

     // Delay estimation variables
     void* delay_estimator;
     WebRtc_UWord16 currentDelay;
     // Far end history variables
     // TODO(bjornv): Replace |far_history| with ring_buffer.
     uint16_t far_history[PART_LEN1 * MAX_DELAY];
     int far_history_pos;
     int far_q_domains[MAX_DELAY];

     WebRtc_Word16 nlpFlag;
     WebRtc_Word16 fixedDelay;

     WebRtc_UWord32 totCount;

     WebRtc_Word16 dfaCleanQDomain;
     WebRtc_Word16 dfaCleanQDomainOld;
     WebRtc_Word16 dfaNoisyQDomain;
     WebRtc_Word16 dfaNoisyQDomainOld;

     WebRtc_Word16 nearLogEnergy[MAX_BUF_LEN];
     WebRtc_Word16 farLogEnergy;
     WebRtc_Word16 echoAdaptLogEnergy[MAX_BUF_LEN];
     WebRtc_Word16 echoStoredLogEnergy[MAX_BUF_LEN];

     // The extra 16 or 32 bytes in the following buffers are for alignment based Neon code.
     // It's designed this way since the current GCC compiler can't align a buffer in 16 or 32
     // byte boundaries properly.
     WebRtc_Word16 channelStored_buf[PART_LEN1 + 8];
     WebRtc_Word16 channelAdapt16_buf[PART_LEN1 + 8];
     WebRtc_Word32 channelAdapt32_buf[PART_LEN1 + 8];
     WebRtc_Word16 xBuf_buf[PART_LEN2 + 16]; // farend
     WebRtc_Word16 dBufClean_buf[PART_LEN2 + 16]; // nearend
     WebRtc_Word16 dBufNoisy_buf[PART_LEN2 + 16]; // nearend
     WebRtc_Word16 outBuf_buf[PART_LEN + 8];

     // Pointers to the above buffers
     WebRtc_Word16 *channelStored;
     WebRtc_Word16 *channelAdapt16;
     WebRtc_Word32 *channelAdapt32;
     WebRtc_Word16 *xBuf;
     WebRtc_Word16 *dBufClean;
     WebRtc_Word16 *dBufNoisy;
     WebRtc_Word16 *outBuf;

     WebRtc_Word32 echoFilt[PART_LEN1];
     WebRtc_Word16 nearFilt[PART_LEN1];
     WebRtc_Word32 noiseEst[PART_LEN1];
     int           noiseEstTooLowCtr[PART_LEN1];
     int           noiseEstTooHighCtr[PART_LEN1];
     WebRtc_Word16 noiseEstCtr;
     WebRtc_Word16 cngMode;

     WebRtc_Word32 mseAdaptOld;
     WebRtc_Word32 mseStoredOld;
     WebRtc_Word32 mseThreshold;

     WebRtc_Word16 farEnergyMin;
     WebRtc_Word16 farEnergyMax;
     WebRtc_Word16 farEnergyMaxMin;
     WebRtc_Word16 farEnergyVAD;
     WebRtc_Word16 farEnergyMSE;
     int currentVADValue;
     WebRtc_Word16 vadUpdateCount;

     WebRtc_Word16 startupState;
     WebRtc_Word16 mseChannelCount;
     WebRtc_Word16 supGain;
     WebRtc_Word16 supGainOld;

     WebRtc_Word16 supGainErrParamA;
     WebRtc_Word16 supGainErrParamD;
     WebRtc_Word16 supGainErrParamDiffAB;
     WebRtc_Word16 supGainErrParamDiffBD;

     struct RealFFT* real_fft;

 #ifdef AEC_DEBUG
     FILE *farFile;
     FILE *nearFile;
     FILE *outFile;
 #endif
 } AecmCore_t;

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_CreateCore(...)
 //
 // Allocates the memory needed by the AECM. The memory needs to be
 // initialized separately using the WebRtcAecm_InitCore() function.
 //
 // Input:
 //      - aecm          : Instance that should be created
 //
 // Output:
 //      - aecm          : Created instance
 //
 // Return value         :  0 - Ok
 //                        -1 - Error
 //
 int WebRtcAecm_CreateCore(AecmCore_t **aecm);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_InitCore(...)
 //
 // This function initializes the AECM instant created with WebRtcAecm_CreateCore(...)
 // Input:
 //      - aecm          : Pointer to the AECM instance
 //      - samplingFreq  : Sampling Frequency
 //
 // Output:
 //      - aecm          : Initialized instance
 //
 // Return value         :  0 - Ok
 //                        -1 - Error
 //
 int WebRtcAecm_InitCore(AecmCore_t * const aecm, int samplingFreq);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_FreeCore(...)
 //
 // This function releases the memory allocated by WebRtcAecm_CreateCore()
 // Input:
 //      - aecm          : Pointer to the AECM instance
 //
 // Return value         :  0 - Ok
 //                        -1 - Error
 //           11001-11016: Error
 //
 int WebRtcAecm_FreeCore(AecmCore_t *aecm);

 int WebRtcAecm_Control(AecmCore_t *aecm, int delay, int nlpFlag);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_InitEchoPathCore(...)
 //
 // This function resets the echo channel adaptation with the specified channel.
 // Input:
 //      - aecm          : Pointer to the AECM instance
 //      - echo_path     : Pointer to the data that should initialize the echo path
 //
 // Output:
 //      - aecm          : Initialized instance
 //
 void WebRtcAecm_InitEchoPathCore(AecmCore_t* aecm, const WebRtc_Word16* echo_path);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_ProcessFrame(...)
 //
 // This function processes frames and sends blocks to WebRtcAecm_ProcessBlock(...)
 //
 // Inputs:
 //      - aecm          : Pointer to the AECM instance
 //      - farend        : In buffer containing one frame of echo signal
 //      - nearendNoisy  : In buffer containing one frame of nearend+echo signal without NS
 //      - nearendClean  : In buffer containing one frame of nearend+echo signal with NS
 //
 // Output:
 //      - out           : Out buffer, one frame of nearend signal          :
 //
 //
 int WebRtcAecm_ProcessFrame(AecmCore_t * aecm, const WebRtc_Word16 * farend,
                             const WebRtc_Word16 * nearendNoisy,
                             const WebRtc_Word16 * nearendClean,
                             WebRtc_Word16 * out);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_ProcessBlock(...)
 //
 // This function is called for every block within one frame
 // This function is called by WebRtcAecm_ProcessFrame(...)
 //
 // Inputs:
 //      - aecm          : Pointer to the AECM instance
 //      - farend        : In buffer containing one block of echo signal
 //      - nearendNoisy  : In buffer containing one frame of nearend+echo signal without NS
 //      - nearendClean  : In buffer containing one frame of nearend+echo signal with NS
 //
 // Output:
 //      - out           : Out buffer, one block of nearend signal          :
 //
 //
 int WebRtcAecm_ProcessBlock(AecmCore_t * aecm, const WebRtc_Word16 * farend,
                             const WebRtc_Word16 * nearendNoisy,
                             const WebRtc_Word16 * noisyClean,
                             WebRtc_Word16 * out);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_BufferFarFrame()
 //
 // Inserts a frame of data into farend buffer.
 //
 // Inputs:
 //      - aecm          : Pointer to the AECM instance
 //      - farend        : In buffer containing one frame of farend signal
 //      - farLen        : Length of frame
 //
 void WebRtcAecm_BufferFarFrame(AecmCore_t * const aecm, const WebRtc_Word16 * const farend,
                                const int farLen);

 ///////////////////////////////////////////////////////////////////////////////////////////////
 // WebRtcAecm_FetchFarFrame()
 //
 // Read the farend buffer to account for known delay
 //
 // Inputs:
 //      - aecm          : Pointer to the AECM instance
 //      - farend        : In buffer containing one frame of farend signal
 //      - farLen        : Length of frame
 //      - knownDelay    : known delay
 //
 void WebRtcAecm_FetchFarFrame(AecmCore_t * const aecm, WebRtc_Word16 * const farend,
                               const int farLen, const int knownDelay);

 ///////////////////////////////////////////////////////////////////////////////
 // Some function pointers, for internal functions shared by ARM NEON and
 // generic C code.
 //
 typedef void (*CalcLinearEnergies)(
     AecmCore_t* aecm,
     const WebRtc_UWord16* far_spectrum,
     WebRtc_Word32* echoEst,
     WebRtc_UWord32* far_energy,
     WebRtc_UWord32* echo_energy_adapt,
     WebRtc_UWord32* echo_energy_stored);
 extern CalcLinearEnergies WebRtcAecm_CalcLinearEnergies;

 typedef void (*StoreAdaptiveChannel)(
     AecmCore_t* aecm,
     const WebRtc_UWord16* far_spectrum,
     WebRtc_Word32* echo_est);
 extern StoreAdaptiveChannel WebRtcAecm_StoreAdaptiveChannel;

 typedef void (*ResetAdaptiveChannel)(AecmCore_t* aecm);
 extern ResetAdaptiveChannel WebRtcAecm_ResetAdaptiveChannel;

 typedef void (*WindowAndFFT)(
     AecmCore_t* aecm,
     WebRtc_Word16* fft,
     const WebRtc_Word16* time_signal,
     complex16_t* freq_signal,
     int time_signal_scaling);
 extern WindowAndFFT WebRtcAecm_WindowAndFFT;

 typedef void (*InverseFFTAndWindow)(
     AecmCore_t* aecm,
     WebRtc_Word16* fft, complex16_t* efw,
     WebRtc_Word16* output,
     const WebRtc_Word16* nearendClean);
 extern InverseFFTAndWindow WebRtcAecm_InverseFFTAndWindow;

 // For the above function pointers, functions for generic platforms are declared
 // and defined as static in file aecm_core.c, while those for ARM Neon platforms
 // are declared below and defined in file aecm_core_neon.s.
 #if (defined WEBRTC_DETECT_ARM_NEON) || defined (WEBRTC_ARCH_ARM_NEON)
 void WebRtcAecm_WindowAndFFTNeon(AecmCore_t* aecm,
                                  WebRtc_Word16* fft,
                                  const WebRtc_Word16* time_signal,
                                  complex16_t* freq_signal,
                                  int time_signal_scaling);

 void WebRtcAecm_InverseFFTAndWindowNeon(AecmCore_t* aecm,
                                         WebRtc_Word16* fft,
                                         complex16_t* efw,
                                         WebRtc_Word16* output,
                                         const WebRtc_Word16* nearendClean);

 void WebRtcAecm_CalcLinearEnergiesNeon(AecmCore_t* aecm,
                                        const WebRtc_UWord16* far_spectrum,
                                        WebRtc_Word32* echo_est,
                                        WebRtc_UWord32* far_energy,
                                        WebRtc_UWord32* echo_energy_adapt,
                                        WebRtc_UWord32* echo_energy_stored);

 void WebRtcAecm_StoreAdaptiveChannelNeon(AecmCore_t* aecm,
                                          const WebRtc_UWord16* far_spectrum,
                                          WebRtc_Word32* echo_est);

 void WebRtcAecm_ResetAdaptiveChannelNeon(AecmCore_t* aecm);
 #endif

 #endif
	/*
	* 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.
	*/

	// Performs echo control (suppression) with fft routines in fixed-point

	#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AECM_AECM_CORE_H_
	#define WEBRTC_MODULES_AUDIO_PROCESSING_AECM_AECM_CORE_H_

	#include "typedefs.h"
	#include "signal_processing_library.h"

	#include "aecm_defines.h"

	#ifdef _MSC_VER // visual c++
	#define ALIGN8_BEG __declspec(align(8))
	#define ALIGN8_END
	#else // gcc or icc
	#define ALIGN8_BEG
	#define ALIGN8_END __attribute__((aligned(8)))
	#endif

	extern const WebRtc_Word16 WebRtcAecm_kSqrtHanning[] ALIGN8_END;

	typedef struct {
	WebRtc_Word16 real;
	WebRtc_Word16 imag;
	} complex16_t;

	typedef struct
	{
	int farBufWritePos;
	int farBufReadPos;
	int knownDelay;
	int lastKnownDelay;
	int firstVAD; // Parameter to control poorly initialized channels

	void *farFrameBuf;
	void *nearNoisyFrameBuf;
	void *nearCleanFrameBuf;
	void *outFrameBuf;

	WebRtc_Word16 farBuf[FAR_BUF_LEN];

	WebRtc_Word16 mult;
	WebRtc_UWord32 seed;

	// Delay estimation variables
	void* delay_estimator;
	WebRtc_UWord16 currentDelay;
	// Far end history variables
	// TODO(bjornv): Replace \|far_history\| with ring_buffer.
	uint16_t far_history[PART_LEN1 * MAX_DELAY];
	int far_history_pos;
	int far_q_domains[MAX_DELAY];

	WebRtc_Word16 nlpFlag;
	WebRtc_Word16 fixedDelay;

	WebRtc_UWord32 totCount;

	WebRtc_Word16 dfaCleanQDomain;
	WebRtc_Word16 dfaCleanQDomainOld;
	WebRtc_Word16 dfaNoisyQDomain;
	WebRtc_Word16 dfaNoisyQDomainOld;

	WebRtc_Word16 nearLogEnergy[MAX_BUF_LEN];
	WebRtc_Word16 farLogEnergy;
	WebRtc_Word16 echoAdaptLogEnergy[MAX_BUF_LEN];
	WebRtc_Word16 echoStoredLogEnergy[MAX_BUF_LEN];

	// The extra 16 or 32 bytes in the following buffers are for alignment based Neon code.
	// It's designed this way since the current GCC compiler can't align a buffer in 16 or 32
	// byte boundaries properly.
	WebRtc_Word16 channelStored_buf[PART_LEN1 + 8];
	WebRtc_Word16 channelAdapt16_buf[PART_LEN1 + 8];
	WebRtc_Word32 channelAdapt32_buf[PART_LEN1 + 8];
	WebRtc_Word16 xBuf_buf[PART_LEN2 + 16]; // farend
	WebRtc_Word16 dBufClean_buf[PART_LEN2 + 16]; // nearend
	WebRtc_Word16 dBufNoisy_buf[PART_LEN2 + 16]; // nearend
	WebRtc_Word16 outBuf_buf[PART_LEN + 8];

	// Pointers to the above buffers
	WebRtc_Word16 *channelStored;
	WebRtc_Word16 *channelAdapt16;
	WebRtc_Word32 *channelAdapt32;
	WebRtc_Word16 *xBuf;
	WebRtc_Word16 *dBufClean;
	WebRtc_Word16 *dBufNoisy;
	WebRtc_Word16 *outBuf;

	WebRtc_Word32 echoFilt[PART_LEN1];
	WebRtc_Word16 nearFilt[PART_LEN1];
	WebRtc_Word32 noiseEst[PART_LEN1];
	int noiseEstTooLowCtr[PART_LEN1];
	int noiseEstTooHighCtr[PART_LEN1];
	WebRtc_Word16 noiseEstCtr;
	WebRtc_Word16 cngMode;

	WebRtc_Word32 mseAdaptOld;
	WebRtc_Word32 mseStoredOld;
	WebRtc_Word32 mseThreshold;

	WebRtc_Word16 farEnergyMin;
	WebRtc_Word16 farEnergyMax;
	WebRtc_Word16 farEnergyMaxMin;
	WebRtc_Word16 farEnergyVAD;
	WebRtc_Word16 farEnergyMSE;
	int currentVADValue;
	WebRtc_Word16 vadUpdateCount;

	WebRtc_Word16 startupState;
	WebRtc_Word16 mseChannelCount;
	WebRtc_Word16 supGain;
	WebRtc_Word16 supGainOld;

	WebRtc_Word16 supGainErrParamA;
	WebRtc_Word16 supGainErrParamD;
	WebRtc_Word16 supGainErrParamDiffAB;
	WebRtc_Word16 supGainErrParamDiffBD;

	struct RealFFT* real_fft;

	#ifdef AEC_DEBUG
	FILE *farFile;
	FILE *nearFile;
	FILE *outFile;
	#endif
	} AecmCore_t;

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_CreateCore(...)
	//
	// Allocates the memory needed by the AECM. The memory needs to be
	// initialized separately using the WebRtcAecm_InitCore() function.
	//
	// Input:
	// - aecm : Instance that should be created
	//
	// Output:
	// - aecm : Created instance
	//
	// Return value : 0 - Ok
	// -1 - Error
	//
	int WebRtcAecm_CreateCore(AecmCore_t **aecm);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_InitCore(...)
	//
	// This function initializes the AECM instant created with WebRtcAecm_CreateCore(...)
	// Input:
	// - aecm : Pointer to the AECM instance
	// - samplingFreq : Sampling Frequency
	//
	// Output:
	// - aecm : Initialized instance
	//
	// Return value : 0 - Ok
	// -1 - Error
	//
	int WebRtcAecm_InitCore(AecmCore_t * const aecm, int samplingFreq);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_FreeCore(...)
	//
	// This function releases the memory allocated by WebRtcAecm_CreateCore()
	// Input:
	// - aecm : Pointer to the AECM instance
	//
	// Return value : 0 - Ok
	// -1 - Error
	// 11001-11016: Error
	//
	int WebRtcAecm_FreeCore(AecmCore_t *aecm);

	int WebRtcAecm_Control(AecmCore_t *aecm, int delay, int nlpFlag);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_InitEchoPathCore(...)
	//
	// This function resets the echo channel adaptation with the specified channel.
	// Input:
	// - aecm : Pointer to the AECM instance
	// - echo_path : Pointer to the data that should initialize the echo path
	//
	// Output:
	// - aecm : Initialized instance
	//
	void WebRtcAecm_InitEchoPathCore(AecmCore_t* aecm, const WebRtc_Word16* echo_path);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_ProcessFrame(...)
	//
	// This function processes frames and sends blocks to WebRtcAecm_ProcessBlock(...)
	//
	// Inputs:
	// - aecm : Pointer to the AECM instance
	// - farend : In buffer containing one frame of echo signal
	// - nearendNoisy : In buffer containing one frame of nearend+echo signal without NS
	// - nearendClean : In buffer containing one frame of nearend+echo signal with NS
	//
	// Output:
	// - out : Out buffer, one frame of nearend signal :
	//
	//
	int WebRtcAecm_ProcessFrame(AecmCore_t * aecm, const WebRtc_Word16 * farend,
	const WebRtc_Word16 * nearendNoisy,
	const WebRtc_Word16 * nearendClean,
	WebRtc_Word16 * out);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_ProcessBlock(...)
	//
	// This function is called for every block within one frame
	// This function is called by WebRtcAecm_ProcessFrame(...)
	//
	// Inputs:
	// - aecm : Pointer to the AECM instance
	// - farend : In buffer containing one block of echo signal
	// - nearendNoisy : In buffer containing one frame of nearend+echo signal without NS
	// - nearendClean : In buffer containing one frame of nearend+echo signal with NS
	//
	// Output:
	// - out : Out buffer, one block of nearend signal :
	//
	//
	int WebRtcAecm_ProcessBlock(AecmCore_t * aecm, const WebRtc_Word16 * farend,
	const WebRtc_Word16 * nearendNoisy,
	const WebRtc_Word16 * noisyClean,
	WebRtc_Word16 * out);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_BufferFarFrame()
	//
	// Inserts a frame of data into farend buffer.
	//
	// Inputs:
	// - aecm : Pointer to the AECM instance
	// - farend : In buffer containing one frame of farend signal
	// - farLen : Length of frame
	//
	void WebRtcAecm_BufferFarFrame(AecmCore_t * const aecm, const WebRtc_Word16 * const farend,
	const int farLen);

	///////////////////////////////////////////////////////////////////////////////////////////////
	// WebRtcAecm_FetchFarFrame()
	//
	// Read the farend buffer to account for known delay
	//
	// Inputs:
	// - aecm : Pointer to the AECM instance
	// - farend : In buffer containing one frame of farend signal
	// - farLen : Length of frame
	// - knownDelay : known delay
	//
	void WebRtcAecm_FetchFarFrame(AecmCore_t * const aecm, WebRtc_Word16 * const farend,
	const int farLen, const int knownDelay);

	///////////////////////////////////////////////////////////////////////////////
	// Some function pointers, for internal functions shared by ARM NEON and
	// generic C code.
	//
	typedef void (*CalcLinearEnergies)(
	AecmCore_t* aecm,
	const WebRtc_UWord16* far_spectrum,
	WebRtc_Word32* echoEst,
	WebRtc_UWord32* far_energy,
	WebRtc_UWord32* echo_energy_adapt,
	WebRtc_UWord32* echo_energy_stored);
	extern CalcLinearEnergies WebRtcAecm_CalcLinearEnergies;

	typedef void (*StoreAdaptiveChannel)(
	AecmCore_t* aecm,
	const WebRtc_UWord16* far_spectrum,
	WebRtc_Word32* echo_est);
	extern StoreAdaptiveChannel WebRtcAecm_StoreAdaptiveChannel;

	typedef void (ResetAdaptiveChannel)(AecmCore_t aecm);
	extern ResetAdaptiveChannel WebRtcAecm_ResetAdaptiveChannel;

	typedef void (*WindowAndFFT)(
	AecmCore_t* aecm,
	WebRtc_Word16* fft,
	const WebRtc_Word16* time_signal,
	complex16_t* freq_signal,
	int time_signal_scaling);
	extern WindowAndFFT WebRtcAecm_WindowAndFFT;

	typedef void (*InverseFFTAndWindow)(
	AecmCore_t* aecm,
	WebRtc_Word16* fft, complex16_t* efw,
	WebRtc_Word16* output,
	const WebRtc_Word16* nearendClean);
	extern InverseFFTAndWindow WebRtcAecm_InverseFFTAndWindow;

	// For the above function pointers, functions for generic platforms are declared
	// and defined as static in file aecm_core.c, while those for ARM Neon platforms
	// are declared below and defined in file aecm_core_neon.s.
	#if (defined WEBRTC_DETECT_ARM_NEON) \|\| defined (WEBRTC_ARCH_ARM_NEON)
	void WebRtcAecm_WindowAndFFTNeon(AecmCore_t* aecm,
	WebRtc_Word16* fft,
	const WebRtc_Word16* time_signal,
	complex16_t* freq_signal,
	int time_signal_scaling);

	void WebRtcAecm_InverseFFTAndWindowNeon(AecmCore_t* aecm,
	WebRtc_Word16* fft,
	complex16_t* efw,
	WebRtc_Word16* output,
	const WebRtc_Word16* nearendClean);

	void WebRtcAecm_CalcLinearEnergiesNeon(AecmCore_t* aecm,
	const WebRtc_UWord16* far_spectrum,
	WebRtc_Word32* echo_est,
	WebRtc_UWord32* far_energy,
	WebRtc_UWord32* echo_energy_adapt,
	WebRtc_UWord32* echo_energy_stored);

	void WebRtcAecm_StoreAdaptiveChannelNeon(AecmCore_t* aecm,
	const WebRtc_UWord16* far_spectrum,
	WebRtc_Word32* echo_est);

	void WebRtcAecm_ResetAdaptiveChannelNeon(AecmCore_t* aecm);
	#endif

	#endif