Microphone#

sl_mic_buffer_ready_callback_t#

typedef void(* sl_mic_buffer_ready_callback_t) (const void *buffer, uint32_t n_frames) )(const void *buffer, uint32_t n_frames)

Callback function indicating that the sample buffer is ready.

Returns

• None.

sl_mic_init#

sl_status_t sl_mic_init (uint32_t sample_rate, uint8_t channels)

Initialize the microphone.

Returns

• Returns SL_STATUS_OK on success, non-zero otherwise

sl_mic_deinit#

sl_status_t sl_mic_deinit (void )

De-initialize the microphone.

sl_mic_get_n_samples#

sl_status_t sl_mic_get_n_samples (void * buffer, uint32_t n_frames)

Read samples from the microphone into a sample buffer.

This function starts the microphone sampling and stops the sampling after reading the desired number of samples. Call sl_mic_sample_buffer_ready to check when the samples are ready in the buffer.

sl_mic_start_streaming#

sl_status_t sl_mic_start_streaming (void * buffer, uint32_t n_frames, sl_mic_buffer_ready_callback_t callback)

Read samples from the microphone into a sample buffer continuously.

This function starts the microphone sampling and stops only upon calling sl_mic_stop or sl_mic_deinit. The buffer is used in a "ping-pong" manner meaning that one half of the buffer is used for sampling while the other half is being processed.

sl_mic_start#

sl_status_t sl_mic_start (void )

Start the microphone.

sl_mic_stop#

sl_status_t sl_mic_stop (void )

Stop the microphone.

sl_mic_sample_buffer_ready#

bool sl_mic_sample_buffer_ready (void )

Check whether the sample buffer is ready.

sl_mic_calculate_sound_level#

sl_status_t sl_mic_calculate_sound_level (float * sound_level, const int16_t * buffer, uint32_t n_frames, uint8_t channel)

Calculate the dBSPL value for a channel from a sample buffer.