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156 lines
8.7 KiB
C
156 lines
8.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "soc/soc_caps.h"
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#include "esp_err.h"
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#include "driver/i2s_types.h"
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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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* @brief State Machine
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┌──────────────────────────────────┐
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│ │
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┌─────────────┤ speak-activity-listening-state │ ◄───────────────┐
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│ │ │ │
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│ └──────────────────────────────────┘ │
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│ ▲ │
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│ │ │
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│ │ │
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│ │ │
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│ │ │
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detected speak activity │ │ detected speak activity │ detected speak activity
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>= │ │ >= │ >=
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'speak_activity_thresh' │ │ 'min_speak_activity_thresh' │ 'max_speak_activity_thresh'
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│ │ │
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│ │ && │
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│ │ │
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│ │ detected non-speak activity │
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│ │ < │
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│ │ 'non_speak_activity_thresh' │
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│ │ │
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│ │ │
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│ │ │
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│ │ │
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│ │ │
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│ ┌───────────┴─────────────────────┐ │
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│ │ │ │
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└───────────► │ speak-activity-detected-state ├─────────────────┘
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│ │
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└─┬───────────────────────────────┘
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│
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│ ▲
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│ │
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│ │
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│ │ detected speak activity
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│ │ >=
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│ │ 'min_speak_activity_thresh'
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│ │
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│ │ &&
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│ │
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│ │ detected non-speak activity
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│ │ <
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└─────────────────────┘ 'non_speak_activity_thresh'
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*/
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/**
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* @brief LP VAD peripheral
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*/
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typedef uint32_t lp_vad_t;
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/**
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* @brief Type of VAD unit handle
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*/
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typedef struct vad_unit_ctx_t *vad_unit_handle_t;
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/**
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* @brief LP VAD configurations
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*/
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typedef struct {
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int init_frame_num; /**< Number of init frames that are used for VAD to denoise, this helps the VAD to decrease the accidental trigger ratio.
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Note too big values may lead to voice activity miss */
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int min_energy_thresh; ///< Minimum energy threshold, voice activities with energy higher than this value will be detected.
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bool skip_band_energy_thresh; /**< Skip band energy threshold or not, the passband energy check determines whether the proportion of passband energy within the total frequency domain meets the required threshold.
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Note in different environments, enabling the passband energy check may reduce false trigger rates but could also increase the rate of missed detections. */
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int speak_activity_thresh; /**< When in speak-activity-listening-state, if number of the detected speak activity is higher than this value, VAD runs into speak-activity-detected-state */
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int non_speak_activity_thresh; /**< When in speak-activity-detected-state, if the number of the detected speak activity is higher than this value, but lower than `max_speak_activity_thresh`:
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- if the number of the detected non-speak activity is higher than this value, VAD runs into speak-activity-listening-state
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- if the number of the detected non-speak activity is lower than this value, VAD keeps in speak-activity-detected-state */
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int min_speak_activity_thresh; /**< When in speak-activity-detected-state, if the number of the detected speak activity is higher than this value, but lower than `max_speak_activity_thresh`,
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then the VAD state machine will depends on the value of `non_speak_activity_thresh` */
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int max_speak_activity_thresh; /**< When in speak-activity-detected-state, if the number of the detected speak activity is higher than this value, VAD runs into speak-activity-listening-state */
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} lp_vad_config_t;
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/**
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* @brief LP VAD Init Configurations
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*/
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typedef struct {
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lp_i2s_chan_handle_t lp_i2s_chan; ///< LP I2S channel handle
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lp_vad_config_t vad_config; ///< LP VAD config
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} lp_vad_init_config_t;
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/**
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* @brief New LP VAD unit
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* @param[in] vad_id VAD id
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* @param[in] init_config Initial configurations
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* @param[out] ret_unit Unit handle
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*
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* @return
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* - ESP_OK: On success
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* - ESP_ERR_INVALID_ARG: Invalid argument
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* - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment
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*/
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esp_err_t lp_i2s_vad_new_unit(lp_vad_t vad_id, const lp_vad_init_config_t *init_config, vad_unit_handle_t *ret_unit);
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/**
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* @brief Enable LP VAD
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*
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* @param[in] unit VAD handle
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*
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* @return
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* - ESP_OK: On success
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* - ESP_ERR_INVALID_ARG: Invalid argument
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* - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment
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*/
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esp_err_t lp_i2s_vad_enable(vad_unit_handle_t unit);
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/**
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* @brief Disable LP VAD
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*
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* @param[in] unit VAD handle
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*
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* @return
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* - ESP_OK: On success
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* - ESP_ERR_INVALID_ARG: Invalid argument
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* - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment
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*/
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esp_err_t lp_i2s_vad_disable(vad_unit_handle_t unit);
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/**
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* @brief Delete LP VAD unit
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* @param[in] unit VAD handle
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*
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* @return
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* - ESP_OK: On success
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* - ESP_ERR_INVALID_ARG: Invalid argument
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* - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment
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*/
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esp_err_t lp_i2s_vad_del_unit(vad_unit_handle_t unit);
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#ifdef __cplusplus
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}
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#endif
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