i2s_audio_microphone.h

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#pragma once
 
#ifdef USE_ESP32
 
#include "../i2s_audio.h"
 
#include "esphome/components/microphone/microphone.h"
#include "esphome/core/component.h"
 
#include <freertos/FreeRTOS.h>
#include <freertos/event_groups.h>
#include <freertos/semphr.h>
#include <freertos/task.h>
 
namespace esphome::i2s_audio {
 
class I2SAudioMicrophone final : public I2SAudioIn, public microphone::Microphone, public Component {
 public:
  void setup() override;
  void dump_config() override;
  void start() override;
  void stop() override;
 
  void loop() override;
 
  void set_correct_dc_offset(bool correct_dc_offset) { this->correct_dc_offset_ = correct_dc_offset; }
 
  void set_din_pin(int8_t pin) { this->din_pin_ = (gpio_num_t) pin; }
 
  void set_pdm(bool pdm) { this->pdm_ = pdm; }
 
#if SOC_I2S_SUPPORTS_PDM_RX
  void set_pdm_dsr(i2s_pdm_dsr_t pdm_dsr) { this->pdm_dsr_ = pdm_dsr; }
#endif
 
#ifdef USE_I2S_AUDIO_FULL_DUPLEX
  void build_full_duplex_config(i2s_std_config_t &std_cfg) override;
#endif
 
 protected:
  void build_std_config_(i2s_std_config_t &std_cfg) const;
 
  bool start_driver_();
 
  void stop_driver_();
 
  void fix_dc_offset_(std::vector<uint8_t> &data);
 
  size_t read_(uint8_t *buf, size_t len, uint32_t timeout_ms);
 
  void configure_stream_settings_();
 
  static void mic_task(void *params);
 
  SemaphoreHandle_t active_listeners_semaphore_{nullptr};
  EventGroupHandle_t event_group_{nullptr};
 
  TaskHandle_t task_handle_{nullptr};
 
  gpio_num_t din_pin_{I2S_GPIO_UNUSED};
  i2s_chan_handle_t rx_handle_{nullptr};
#if SOC_I2S_SUPPORTS_PDM_RX
  i2s_pdm_dsr_t pdm_dsr_{I2S_PDM_DSR_8S};
#endif
 
  bool pdm_{false};
  bool correct_dc_offset_;
  bool locked_driver_{false};
  int32_t dc_offset_prev_input_{0};
  int32_t dc_offset_prev_output_{0};
};
 
}  // namespace esphome::i2s_audio
 
#endif  // USE_ESP32