public void NoteOn(byte num, byte key, byte velocity)
{
try
{
Instrument instrument = instrumentTable[new Tuple <byte, byte>(Bank, Instrument)];
int value = instrument.GetSampleEntry(key).Value;
Sample sample = soundData.SampleBanks[soundData.InstrumentBanks[Bank].Wsys][(short)instrument.Samples[value].Id];
AudioBuffer audioBuffer = new AudioBuffer();
audioBuffer.AudioBytes = sample.Data.Length;
audioBuffer.Stream = new DataStream(sample.Data.Length, canRead: true, canWrite: true);
audioBuffer.Stream.Write(sample.Data, 0, sample.Data.Length);
audioBuffer.PlayBegin = 0;
audioBuffer.PlayLength = 0;
audioBuffer.LoopCount = (sample.IsLooping ? 255 : 0);
audioBuffer.LoopBegin = sample.LoopStart;
audioBuffer.LoopLength = 0;
WaveFormat sourceFormat = new WaveFormat(sample.SamplesPerSecond, sample.BitsPerSample, sample.Channels);
SourceVoice sourceVoice = new SourceVoice(engine, sourceFormat, VoiceFlags.None, 1024f);
sourceVoice.SetOutputVoices(new VoiceSendDescriptor(submix));
sourceVoice.SubmitSourceBuffer(audioBuffer, null);
float num2 = XAudio2.SemitonesToFrequencyRatio((!instrument.IsPercussion) ? (key - sample.RootKey) : 0) * instrument.Samples[value].FrequenyMultiplier * instrument.FrequencyMultiplier;
sourceVoice.SetFrequencyRatio(num2);
sourceVoice.SetVolume(ValueToAmplitude(velocity));
NoteData noteData = new NoteData(sourceVoice, num2, velocity, instrument.IsPercussion);
if (instrument.IsPercussion)
{
noteData.PercussionPan = instrument.Samples[value].Pan.Value;
sbyte b = (sbyte)(noteData.PercussionPan - 63);
sourceVoice.SetOutputMatrix(1, 2, new float[2]
{
0.5f - (float)b / 127f,
0.5f + (float)b / 127f
});
}
else
{
sourceVoice.SetOutputMatrix(1, 2, outputMatrix);
}
noteData.BufferStream = audioBuffer.Stream;
noteData.Voice.Start();
voiceTable.Add(num, noteData);
sourceFormat = null;
GC.Collect();
}
catch
{
}
}
/// <summary>
/// Start to play a note, It will be stopped until you call "StopNote"
/// </summary>
/// <param name="notePitch"></param>
public void PlayNote(int notePitch)
{
var asy = Task.Run(() =>
{
if ((Voice == null) || (Instrument == null))
{
return;
}
//If we play another note
if ((notePitch != PlayingPitch) || !IsPlaying || stopping)
{
//Get the frequenc y of the pitch
var FrequencyRatio = XAudio2.SemitonesToFrequencyRatio(notePitch) / 2f;
//See if we should use another sample
var reloadNeeded = Instrument.ReloadNeeded(FrequencyRatio, ActualFrequencyRatio);
if (Instrument.IsPlugged || reloadNeeded || !IsPlaying || stopping)
{
ReloadBuffer(FrequencyRatio, reloadNeeded);
}
CancelStop.Set();
//Set the frequency ratio to the voice
var realFrequencyRatio = Instrument.GetCorrectFrequencyRatio(FrequencyRatio);
Voice.SetFrequencyRatio(realFrequencyRatio);
ActualFrequencyRatio = FrequencyRatio;
PlayingPitch = notePitch;
}
//Start the play if needed
if (!IsPlaying)
{
Voice.Start();
Voice.SetVolume(1, XAudio2.CommitNow);
}
//update state
IsPlaying = true;
});
}
public float SemitonesToFrequencyRatio(float semitones)
{
return(XAudio2.SemitonesToFrequencyRatio(semitones));
}
/// <summary>
/// Sets the frequency of the sound.
/// </summary>
/// <param name="f">The frequency ratio of the sound expressed in semitones.</param>
public void setFrequency(float f)
{
voice.SetFrequencyRatio(XAudio2.SemitonesToFrequencyRatio(f));
}
