Get the most recent X samples from the Unity microphone

gistfile1.txt

private void Awake() {
    _deviceName = "";
    _microphone = Microphone.Start(_deviceName, true, 1, frequency);
    if (_microphone == null) {
        Debug.LogError("Unity returned a null microphone instance :S");
        return;
    }
    _numberOfChannels = _microphone.channels;
    _sampleCount      = _microphone.samples;
}
    
public bool GetMostRecentData(float[] buffer) {
    if (_microphone == null) {
        Debug.LogError("Uh oh, we don't have a microphone to read samples from bruv.");
        return;
    }
    
    // Number of samples to read into the supplied buffer.
    int numberOfSamplesToRead = buffer.Length / _numberOfChannels;
    if (numberOfSamplesToRead > _sampleCount) {
        Debug.LogError("Reading microphone audio data. Supplied buffer is larger than the microphone buffer. (" + buffer.Length + ", " + _sampleCount * _numberOfChannels + ")");
        return false;
    }

    int localWriteHeadPosition = Microphone.GetPosition(_deviceName);
    int localReadHeadPosition = localWriteHeadPosition - numberOfSamplesToRead;
    while (localReadHeadPosition >= _sampleCount)
        localReadHeadPosition -= _sampleCount;
    while (localReadHeadPosition < 0)
        localReadHeadPosition += _sampleCount;
    
    return _microphone.GetData(buffer, localReadHeadPosition);
}