/// <summary>
/// Releases all resource used by the <see cref="T:Pronome.Mixer"/> object.
/// </summary>
/// <remarks>Call <see cref="Dispose"/> when you are finished using the <see cref="T:Pronome.Mixer"/>. The
/// <see cref="Dispose"/> method leaves the <see cref="T:Pronome.Mixer"/> in an unusable state. After calling
/// <see cref="Dispose"/>, you must release all references to the <see cref="T:Pronome.Mixer"/> so the garbage
/// collector can reclaim the memory that the <see cref="T:Pronome.Mixer"/> was occupying.</remarks>
public void Dispose()
{
Graph.Dispose();
MixerNode.Dispose();
_converter.Dispose();
Metronome.Instance.TempoChanged -= TempoChanged;
}
/// <summary>
/// Renders the given number of seconds to the given wav file
/// </summary>
/// <param name="fileName">File name.</param>
/// <param name="seconds">Seconds.</param>
public void RenderToFile(string fileName, double seconds)
{
long samples = (long)(seconds * Metronome.SampleRate);
var inputStream = MixerNode.GetAudioFormat(AudioUnitScopeType.Output);
var outputStream = AudioStreamBasicDescription.CreateLinearPCM(44100, 2);
AudioConverter converter = AudioConverter.Create(inputStream, outputStream);
var file = ExtAudioFile.CreateWithUrl(
new Foundation.NSUrl(fileName, false),
AudioFileType.WAVE,
outputStream,
AudioFileFlags.EraseFlags,
out ExtAudioFileError e
);
long samplesRead = 0;
// initialize the buffers
var buffers = new AudioBuffers(2);
buffers[0] = new AudioBuffer()
{
DataByteSize = BufferSize * 4,
NumberChannels = 1,
Data = Marshal.AllocHGlobal(sizeof(float) * BufferSize)
};
buffers[1] = new AudioBuffer()
{
DataByteSize = BufferSize * 4,
NumberChannels = 1,
Data = Marshal.AllocHGlobal(sizeof(float) * BufferSize)
};
var convBuffers = new AudioBuffers(1);
convBuffers[0] = new AudioBuffer()
{
DataByteSize = BufferSize * 4,
NumberChannels = 2,
Data = Marshal.AllocHGlobal(sizeof(float) * BufferSize)
};
while (samples > 0)
{
int numSamples = (int)(Math.Min(BufferSize, samples));
// get samples from the mixer
Render((uint)numSamples, buffers, samplesRead);
// conver to the file's format
converter.ConvertComplexBuffer(numSamples, buffers, convBuffers);
// write samples to the file
var error = file.Write((uint)numSamples, convBuffers);
if (error != ExtAudioFileError.OK)
{
throw new ApplicationException();
}
samples -= BufferSize;
samplesRead += numSamples;
}
buffers.Dispose();
convBuffers.Dispose();
converter.Dispose();
file.Dispose();
}
