esp-who/components/esp-sr/acoustic_algorithm/include/esp_aec.h

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2020-02-17 15:55:27 +08:00
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License
#ifndef _ESP_AEC_H_
#define _ESP_AEC_H_
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define USE_AEC_FFT // Not kiss_fft
#define AEC_SAMPLE_RATE 16000 // Only Support 16000Hz
#define AEC_FRAME_LENGTH_MS 16 // Only support 16ms
#define AEC_FILTER_LENGTH 1200 // Number of samples of echo to cancel
typedef void* aec_handle_t;
/**
* @brief Creates an instance to the AEC structure.
*
* @param sample_rate The Sampling frequency (Hz) can be 8000, 16000.
*
* @param frame_length The length of the audio processing can be 10ms, 20ms, 30ms, default: 30.
*
* @param filter_length Number of samples of echo to cancel.
*
* @return
* - NULL: Create failed
* - Others: The instance of AEC
*/
aec_handle_t aec_create(int sample_rate, int frame_length, int filter_length);
/**
* @brief Performs echo cancellation a frame, based on the audio sent to the speaker and frame from mic.
*
* @param inst The instance of AEC.
*
* @param indata An array of 16-bit signed audio samples from mic.
*
* @param refdata An array of 16-bit signed audio samples sent to the speaker.
*
* @param outdata Returns near-end signal with echo removed.
*
* @return None
*
*/
void aec_process(aec_handle_t inst, int16_t *indata, int16_t *refdata, int16_t *outdata);
/**
* @brief Free the AEC instance
*
* @param inst The instance of AEC.
*
* @return None
*
*/
void aec_destroy(aec_handle_t inst);
#ifdef __cplusplus
extern "C" {
#endif
#endif //_ESP_AEC_H_