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* Copyright (c) 2011 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 "typedefs.h"
#include "signal_processing_library.h"
#include "nsx_defines.h"
#include <stdio.h>
typedef struct NsxInst_t_ {
WebRtc_UWord32 fs;
const WebRtc_Word16* window;
WebRtc_Word16 analysisBuffer[ANAL_BLOCKL_MAX];
WebRtc_Word16 synthesisBuffer[ANAL_BLOCKL_MAX];
WebRtc_UWord16 noiseSupFilter[HALF_ANAL_BLOCKL];
WebRtc_UWord16 overdrive; /* Q8 */
WebRtc_UWord16 denoiseBound; /* Q14 */
const WebRtc_Word16* factor2Table;
WebRtc_Word16 noiseEstLogQuantile[SIMULT* HALF_ANAL_BLOCKL];
WebRtc_Word16 noiseEstDensity[SIMULT* HALF_ANAL_BLOCKL];
WebRtc_Word16 noiseEstCounter[SIMULT];
WebRtc_Word16 noiseEstQuantile[HALF_ANAL_BLOCKL];
WebRtc_Word16 anaLen;
int anaLen2;
int magnLen;
int aggrMode;
int stages;
int initFlag;
int gainMap;
WebRtc_Word32 maxLrt;
WebRtc_Word32 minLrt;
WebRtc_Word32 logLrtTimeAvgW32[HALF_ANAL_BLOCKL]; //log lrt factor with time-smoothing in Q8
WebRtc_Word32 featureLogLrt;
WebRtc_Word32 thresholdLogLrt;
WebRtc_Word16 weightLogLrt;
WebRtc_UWord32 featureSpecDiff;
WebRtc_UWord32 thresholdSpecDiff;
WebRtc_Word16 weightSpecDiff;
WebRtc_UWord32 featureSpecFlat;
WebRtc_UWord32 thresholdSpecFlat;
WebRtc_Word16 weightSpecFlat;
WebRtc_Word32 avgMagnPause[HALF_ANAL_BLOCKL]; //conservative estimate of noise spectrum
WebRtc_UWord32 magnEnergy;
WebRtc_UWord32 sumMagn;
WebRtc_UWord32 curAvgMagnEnergy;
WebRtc_UWord32 timeAvgMagnEnergy;
WebRtc_UWord32 timeAvgMagnEnergyTmp;
WebRtc_UWord32 whiteNoiseLevel; //initial noise estimate
WebRtc_UWord32 initMagnEst[HALF_ANAL_BLOCKL];//initial magnitude spectrum estimate
WebRtc_Word32 pinkNoiseNumerator; //pink noise parameter: numerator
WebRtc_Word32 pinkNoiseExp; //pink noise parameter: power of freq
int minNorm; //smallest normalization factor
int zeroInputSignal; //zero input signal flag
WebRtc_UWord32 prevNoiseU32[HALF_ANAL_BLOCKL]; //noise spectrum from previous frame
WebRtc_UWord16 prevMagnU16[HALF_ANAL_BLOCKL]; //magnitude spectrum from previous frame
WebRtc_Word16 priorNonSpeechProb; //prior speech/noise probability // Q14
int blockIndex; //frame index counter
int modelUpdate; //parameter for updating or estimating thresholds/weights for prior model
int cntThresUpdate;
//histograms for parameter estimation
WebRtc_Word16 histLrt[HIST_PAR_EST];
WebRtc_Word16 histSpecFlat[HIST_PAR_EST];
WebRtc_Word16 histSpecDiff[HIST_PAR_EST];
//quantities for high band estimate
WebRtc_Word16 dataBufHBFX[ANAL_BLOCKL_MAX]; /* Q0 */
int qNoise;
int prevQNoise;
int prevQMagn;
int blockLen10ms;
WebRtc_Word16 real[ANAL_BLOCKL_MAX];
WebRtc_Word16 imag[ANAL_BLOCKL_MAX];
WebRtc_Word32 energyIn;
int scaleEnergyIn;
int normData;
} NsxInst_t;
#ifdef __cplusplus
extern "C"
* WebRtcNsx_InitCore(...)
* This function initializes a noise suppression instance
* Input:
* - inst : Instance that should be initialized
* - fs : Sampling frequency
* Output:
* - inst : Initialized instance
* Return value : 0 - Ok
* -1 - Error
WebRtc_Word32 WebRtcNsx_InitCore(NsxInst_t* inst, WebRtc_UWord32 fs);
* WebRtcNsx_set_policy_core(...)
* This changes the aggressiveness of the noise suppression method.
* Input:
* - inst : Instance that should be initialized
* - mode : 0: Mild (6 dB), 1: Medium (10 dB), 2: Aggressive (15 dB)
* Output:
* - inst : Initialized instance
* Return value : 0 - Ok
* -1 - Error
int WebRtcNsx_set_policy_core(NsxInst_t* inst, int mode);
* WebRtcNsx_ProcessCore
* Do noise suppression.
* Input:
* - inst : Instance that should be initialized
* - inFrameLow : Input speech frame for lower band
* - inFrameHigh : Input speech frame for higher band
* Output:
* - inst : Updated instance
* - outFrameLow : Output speech frame for lower band
* - outFrameHigh : Output speech frame for higher band
* Return value : 0 - OK
* -1 - Error
int WebRtcNsx_ProcessCore(NsxInst_t* inst,
short* inFrameLow,
short* inFrameHigh,
short* outFrameLow,
short* outFrameHigh);
* Some function pointers, for internal functions shared by ARM NEON and
* generic C code.
// Noise Estimation.
typedef void (*NoiseEstimation)(NsxInst_t* inst,
uint16_t* magn,
uint32_t* noise,
int16_t* q_noise);
extern NoiseEstimation WebRtcNsx_NoiseEstimation;
// Filter the data in the frequency domain, and create spectrum.
typedef void (*PrepareSpectrum)(NsxInst_t* inst,
int16_t* freq_buff);
extern PrepareSpectrum WebRtcNsx_PrepareSpectrum;
// For the noise supression process, synthesis, read out fully processed
// segment, and update synthesis buffer.
typedef void (*SynthesisUpdate)(NsxInst_t* inst,
int16_t* out_frame,
int16_t gain_factor);
extern SynthesisUpdate WebRtcNsx_SynthesisUpdate;
// Update analysis buffer for lower band, and window data before FFT.
typedef void (*AnalysisUpdate)(NsxInst_t* inst,
int16_t* out,
int16_t* new_speech);
extern AnalysisUpdate WebRtcNsx_AnalysisUpdate;
// Denormalize the input buffer.
typedef void (*Denormalize)(NsxInst_t* inst,
int16_t* in,
int factor);
extern Denormalize WebRtcNsx_Denormalize;
// Create a complex number buffer, as the intput interleaved with zeros,
// and normalize it.
typedef void (*CreateComplexBuffer)(NsxInst_t* inst,
int16_t* in,
int16_t* out);
extern CreateComplexBuffer WebRtcNsx_CreateComplexBuffer;
* Initialization of the above function pointers for ARM Neon.
void WebRtcNsx_InitNeon(void);
extern const WebRtc_Word16 WebRtcNsx_kLogTable[9];
extern const WebRtc_Word16 WebRtcNsx_kLogTableFrac[256];
extern const WebRtc_Word16 WebRtcNsx_kCounterDiv[201];
#ifdef __cplusplus