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124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*
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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_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_H_
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#define WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_H_
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#include "webrtc/typedefs.h"
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typedef struct NsHandleT NsHandle;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This function creates an instance to the noise suppression structure
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*
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* Input:
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* - NS_inst : Pointer to noise suppression instance that should be
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* created
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*
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* Output:
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* - NS_inst : Pointer to created noise suppression instance
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int WebRtcNs_Create(NsHandle** NS_inst);
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/*
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* This function frees the dynamic memory of a specified noise suppression
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* instance.
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*
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* Input:
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* - NS_inst : Pointer to NS instance that should be freed
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int WebRtcNs_Free(NsHandle* NS_inst);
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/*
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* This function initializes a NS instance and has to be called before any other
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* processing is made.
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*
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* Input:
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* - NS_inst : Instance that should be initialized
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* - fs : sampling frequency
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*
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* Output:
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* - NS_inst : Initialized instance
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int WebRtcNs_Init(NsHandle* NS_inst, uint32_t fs);
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/*
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* This changes the aggressiveness of the noise suppression method.
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*
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* Input:
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* - NS_inst : Noise suppression instance.
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* - mode : 0: Mild, 1: Medium , 2: Aggressive
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*
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* Output:
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* - NS_inst : Updated instance.
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int WebRtcNs_set_policy(NsHandle* NS_inst, int mode);
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/*
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* This functions does Noise Suppression for the inserted speech frame. The
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* input and output signals should always be 10ms (80 or 160 samples).
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*
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* Input
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* - NS_inst : Noise suppression instance.
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* - spframe : Pointer to speech frame buffer for L band
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* - spframe_H : Pointer to speech frame buffer for H band
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* - fs : sampling frequency
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*
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* Output:
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* - NS_inst : Updated NS instance
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* - outframe : Pointer to output frame for L band
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* - outframe_H : Pointer to output frame for H band
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*
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* Return value : 0 - OK
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* -1 - Error
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*/
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int WebRtcNs_Process(NsHandle* NS_inst,
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float* spframe,
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float* spframe_H,
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float* outframe,
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float* outframe_H);
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/* Returns the internally used prior speech probability of the current frame.
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* There is a frequency bin based one as well, with which this should not be
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* confused.
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*
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* Input
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* - handle : Noise suppression instance.
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*
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* Return value : Prior speech probability in interval [0.0, 1.0].
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* -1 - NULL pointer or uninitialized instance.
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*/
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float WebRtcNs_prior_speech_probability(NsHandle* handle);
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#ifdef __cplusplus
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}
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#endif
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#endif // WEBRTC_MODULES_AUDIO_PROCESSING_NS_INCLUDE_NOISE_SUPPRESSION_H_
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