public LoopbackRecorder()
{
_outputStream = new IgnoreDisposeStream(new MemoryStream());
_waveIn = new WasapiLoopbackCapture();
_waveIn.DataAvailable += OnDataAvailable;
_waveIn.RecordingStopped += OnRecordingStopped;
_writer = new WaveFileWriter(_outputStream, _waveIn.WaveFormat);
}
public void StartRecording()
{
// If we are currently record then go ahead and exit out.
if (_isRecording == true)
{
return;
}
_outputStream = new IgnoreDisposeStream(new MemoryStream());
_waveIn = new WasapiLoopbackCapture();
_writer = new WaveFileWriter(_outputStream, _waveIn.WaveFormat);
_waveIn.DataAvailable += OnDataAvailable;
_waveIn.RecordingStopped += OnRecordingStopped;
_waveIn.StartRecording();
_isRecording = true;
}
private static void EnsureLength(Pattern pattern, int msPerBeat, WaveMixerStream32 finalMixer, StreamTracker streamTracker)
{
int avgBytesPerMs = finalMixer.WaveFormat.AverageBytesPerSecond / 1000;
int beatArrayLen = avgBytesPerMs * msPerBeat;
var silence = new byte[beatArrayLen];
var mem = new IgnoreDisposeStream(new MemoryStream());
streamTracker.AddStream(mem);
using (var writer = new WaveFileWriter(mem, finalMixer.WaveFormat))
{
for (int i = 0; i < pattern.NumberOfBeats; ++i)
{
writer.Write(silence, 0, silence.Length);
writer.Flush();
}
}
mem.Position = 0;
var rdr = new WaveFileReader(mem);
finalMixer.AddInputStream(rdr);
}
private static void AddInstrumentStreamsToMixer(Pattern pattern, int bpm, WaveMixerStream32 finalMixer, StreamTracker streamTracker)
{
double minutesPerBeat = 1d / (double)bpm;
int msPerBeat = (int)(minutesPerBeat * 60d * 1000d);
foreach (var instrument in pattern.Instruments)
{
var audio = GetIeeeFloatWaveBytes(instrument, out int audioLen, out WaveFormat format);
int avgBytesPerMs = format.AverageBytesPerSecond / 1000;
int beatArrayLen = avgBytesPerMs * msPerBeat;
var instrumentMixer = new WaveMixerStream32();
streamTracker.AddStream(instrumentMixer);
int i = 0;
var silence = new byte[beatArrayLen];
foreach (var beat in instrument.Beats)
{
if (beat.IsEnabled)
{
var mem = new IgnoreDisposeStream(new MemoryStream());
streamTracker.AddStream(mem);
using (var writer = new WaveFileWriter(mem, format))
{
// for each beat of the instrument after the first, pad the stream with silence before the beat position, eg:
// beat
// silence | beat
// silence | silence | beat
// etc., then mix all the streams together
for (int j = 0; j < i; ++j)
{
writer.Write(silence, 0, silence.Length);
}
writer.Write(audio, 0, audioLen);
writer.Flush();
}
mem.Position = 0;
instrumentMixer.AddInputStream(new WaveFileReader(mem));
}
++i;
}
var instrumentStream = new IgnoreDisposeStream(new MemoryStream());
streamTracker.AddStream(instrumentStream);
WaveFileWriter.WriteWavFileToStream(instrumentStream, instrumentMixer);
instrumentStream.Position = 0;
var instrumentReader = new WaveFileReader(instrumentStream);
finalMixer.AddInputStream(instrumentReader);
}
EnsureLength(pattern, msPerBeat, finalMixer, streamTracker);
}