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0cbb58e046
This is a reland of 87a7b82520
Original change's description:
> Refactoring of the noise suppressor and adding true multichannel support
>
> This CL adds proper multichannel support to the noise suppressor.
> To accomplish that in a safe way, a full refactoring of the noise
> suppressor code has been done.
>
> Due to floating point precision, the changes made are not entirely
> bitexact. They are, however, very close to being bitexact.
>
> As a safety measure, the former noise suppressor code is preserved
> and a kill-switch is added to allow revering to the legacy noise
> suppressor in case issues arise.
>
> Bug: webrtc:10895, b/143344262
> Change-Id: I0b071011b23265ac12e6d4b3956499d122286657
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158407
> Commit-Queue: Per Åhgren <peah@webrtc.org>
> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29646}
Bug: webrtc:10895, b/143344262
Change-Id: I236f1e67bb0baa4e30908a4cf7a8a7bb55fbced3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158747
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29663}
134 lines
4 KiB
C
134 lines
4 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 MODULES_AUDIO_PROCESSING_LEGACY_NS_NOISE_SUPPRESSION_H_
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#define MODULES_AUDIO_PROCESSING_LEGACY_NS_NOISE_SUPPRESSION_H_
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#include <stddef.h>
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#include <stdint.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 of the floating point Noise Suppression.
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*/
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NsHandle* WebRtcNs_Create(void);
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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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void 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 estimates the background noise for the inserted speech frame.
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* The 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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*
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* Output:
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* - NS_inst : Updated NS instance
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*/
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void WebRtcNs_Analyze(NsHandle* NS_inst, const float* spframe);
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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 each band
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* - num_bands : Number of bands
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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 each band
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*/
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void WebRtcNs_Process(NsHandle* NS_inst,
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const float* const* spframe,
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size_t num_bands,
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float* const* outframe);
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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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/* Returns a pointer to the noise estimate per frequency bin. The number of
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* frequency bins can be provided using WebRtcNs_num_freq().
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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 : Pointer to the noise estimate per frequency bin.
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* Returns NULL if the input is a NULL pointer or an
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* uninitialized instance.
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*/
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const float* WebRtcNs_noise_estimate(const NsHandle* handle);
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/* Returns the number of frequency bins, which is the length of the noise
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* estimate for example.
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*
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* Return value : Number of frequency bins.
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*/
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size_t WebRtcNs_num_freq(void);
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#ifdef __cplusplus
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}
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#endif
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#endif // MODULES_AUDIO_PROCESSING_LEGACY_NS_NOISE_SUPPRESSION_H_
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