71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License
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#ifndef _ESP_NS_H_
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#define _ESP_NS_H_
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define NS_FRAME_LENGTH_MS 30 //Supports 10ms, 20ms, 30ms
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/**
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* The Sampling frequency (Hz) must be 16000Hz
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*/
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typedef void* ns_handle_t;
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/**
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* @brief Creates an instance to the NS structure.
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*
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* @param frame_length_ms The length of the audio processing can be 10ms, 20ms, 30ms.
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*
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* @return
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* - NULL: Create failed
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* - Others: The instance of NS
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*/
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ns_handle_t ns_create(int frame_length_ms);
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/**
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* @brief Feed samples of an audio stream to the NS and get the audio stream after Noise suppression.
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*
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* @param inst The instance of NS.
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*
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* @param indata An array of 16-bit signed audio samples.
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*
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* @param outdata An array of 16-bit signed audio samples after noise suppression.
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*
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* @return None
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*
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*/
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void ns_process(ns_handle_t inst, int16_t *indata, int16_t *outdata);
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/**
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* @brief Free the NS instance
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*
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* @param inst The instance of NS.
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*
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* @return None
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*
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*/
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void ns_destroy(ns_handle_t inst);
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#ifdef __cplusplus
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extern "C" {
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#endif
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#endif //_ESP_NS_H_
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