public void Render(IAudioRecording audioRecording, Canvas audioCanvas)
{
using (var audioFileReader = new AudioFileReader(audioRecording.Filename))
{
var canvasWidth = audioCanvas.ActualWidth;
var waveFormat = audioFileReader.WaveFormat;
var totalSamples = audioFileReader.Length / (waveFormat.Channels * waveFormat.BitsPerSample / 8);
var bytesPerBatch = (int)Math.Max(40, totalSamples / canvasWidth);
var mid = 100;
var yScale = 100;
float[] byteBuffer = new float[bytesPerBatch];
var xPos = 0;
bool hasBytesRemaining = true;
while (hasBytesRemaining)
{
var actualBytesRead = audioFileReader.Read(byteBuffer, 0, bytesPerBatch);
hasBytesRemaining = actualBytesRead == bytesPerBatch;
float maxValue = FindMaxValue(byteBuffer);
DrawVerticalLine(audioCanvas, xPos, maxValue);
xPos++;
}
}
}
public void Play(IAudioRecording audio)
{
if (currentlyPlayingConceptId == audio.ConceptId)
{
return;
}
currentlyPlayingConceptId = audio.ConceptId;
/* Handle the case where a new audio file gets queued over the current one. */
if (audioDisposable != null)
{
audioDisposable.Dispose();
audioDisposable = null;
}
var outputDevice = new WaveOutEvent();
var audioFile = new AudioFileReader($@"{audio.ConceptId.ToString()}.wav");
outputDevice.PlaybackStopped += OnPlaybackStopped;
outputDevice.Init(audioFile);
outputDevice.Play();
audioDisposable = new CompositeDisposable()
{
// TODO: Is it valid to assume here that we can dispose of the
// output device immediately after telling the device to stop?
Disposable.Create(outputDevice.Stop),
outputDevice,
audioFile
};
}
public NAudioRecorder(WaveIn waveInput, IAudioRecording audioRecording)
{
_waveInput = waveInput;
AudioRecording = audioRecording;
}
public void Add(IAudioRecording recording)
{
}