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78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
// 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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#define MAP_SAMPLE_RATE 16000 // Supports 16kHz only
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#define MAP_FRAME_SIZE 16 // Supports 16ms only
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#define MAP_MIC_DISTANCE 50 // According to physical design of mic-array
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#define MAP_AEC_ON true
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#define MAP_AEC_OFF false
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#define MAP_AEC_FILTER_LENGTH 1200 // Number of samples of echo to cancel
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/**
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* @brief Sets mic-array type, currently 2-mic line array and 3-mic circular array
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* are supported.
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*/
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typedef enum {
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TWO_MIC_LINE = 0,
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THREE_MIC_CIRCLE = 1
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} map_mic_array_type_t;
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typedef void* mic_array_processor_t;
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/**
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* @brief Creates an instance to the MAP structure.
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*
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* @param sample_rate The sampling frequency (Hz) must be 16000.
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*
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* @param frame_size The length of the audio processing must be 16ms.
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*
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* @param array_type '0' for 2-mic line array and '1' for 3-mic circular array.
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*
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* @param mic_distance The distance between neiboring microphones in mm.
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*
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* @param aec_on Decides whether to turn on AEC.
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*
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* @param filter_length Number of samples of echo to cancel, effective when AEC is on.
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*
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* @return
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* - NULL: Create failed
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* - Others: An instance of MAP
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*/
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mic_array_processor_t map_create(int fs, int frame_size, int array_type, float mic_distance, bool aec_on, int filter_length);
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/**
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* @brief Performs mic array processing for one frame.
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*
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* @param inst The instance of MAP.
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*
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* @param in An array of 16-bit signed audio samples from mic.
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*
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* @param far_end An array of 16-bit signed audio samples sent to the speaker, can be none when AEC is turned off.
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*
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* @param dsp_out Returns enhanced signal.
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*
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* @return None
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*
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*/
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void map_process(mic_array_processor_t st, int16_t *in, int16_t *far_end, int16_t *dsp_out);
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/**
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* @brief Free the MAP instance
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*
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* @param inst The instance of MAP.
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*
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* @return None
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*
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*/
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void map_destory(mic_array_processor_t st); |