77 lines
2.1 KiB
C
77 lines
2.1 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_AEC_H_
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#define _ESP_AEC_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 USE_AEC_FFT // Not kiss_fft
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#define AEC_SAMPLE_RATE 16000 // Only Support 16000Hz
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#define AEC_FRAME_LENGTH_MS 16 // Only support 16ms
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#define AEC_FILTER_LENGTH 1200 // Number of samples of echo to cancel
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typedef void* aec_handle_t;
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/**
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* @brief Creates an instance to the AEC structure.
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*
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* @param sample_rate The Sampling frequency (Hz) can be 8000, 16000.
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*
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* @param frame_length The length of the audio processing can be 10ms, 20ms, 30ms, default: 30.
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*
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* @param filter_length Number of samples of echo to cancel.
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*
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* @return
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* - NULL: Create failed
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* - Others: The instance of AEC
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*/
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aec_handle_t aec_create(int sample_rate, int frame_length, int filter_length);
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/**
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* @brief Performs echo cancellation a frame, based on the audio sent to the speaker and frame from mic.
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*
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* @param inst The instance of AEC.
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*
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* @param indata An array of 16-bit signed audio samples from mic.
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*
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* @param refdata An array of 16-bit signed audio samples sent to the speaker.
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*
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* @param outdata Returns near-end signal with echo removed.
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*
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* @return None
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*
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*/
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void aec_process(aec_handle_t inst, int16_t *indata, int16_t *refdata, int16_t *outdata);
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/**
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* @brief Free the AEC instance
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*
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* @param inst The instance of AEC.
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*
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* @return None
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*
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*/
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void aec_destroy(aec_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_AEC_H_
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