AudioStreamManager.kt

private const val RECORDER_SAMPLERATE = 44100
private val RECORDER_CHANNELS: Int = AudioFormat.CHANNEL_IN_STEREO
private val RECORDER_AUDIO_ENCODING: Int = AudioFormat.ENCODING_PCM_16BIT

class AudioStreamManager {
  
 private var audioRecord: AudioRecord? = null
  
 val BUFFER_SIZE_RECORDING = AudioRecord.getMinBufferSize(
          RECORDER_SAMPLERATE,
          RECORDER_CHANNELS,
          RECORDER_AUDIO_ENCODING
        ) * 4
  
 fun initAudioRecorder() {
   
    audioRecord = AudioRecord(
        MediaRecorder.AudioSource.MIC,
        RECORDER_SAMPLERATE, RECORDER_CHANNELS,
        RECORDER_AUDIO_ENCODING, BUFFER_SIZE_RECORDING
    )
    
    audioRecord?.startRecording()
   }
}