public void BasicOperations()
{
using (var buf = new RingBuffer()) {
Assert.Equal(0, buf.BytesAvailable());
Assert.Equal(8191, buf.WriteBytesAvailable()); // implementation dependent.
using (var synth = new SynthUnit(buf)) {
var bytes = new byte [] { 0x90, 0x30, 0 }; // note on at 0x30, but with no velocity = no sound.
buf.Write(bytes, 0, bytes.Length);
var results = new short [1024];
Assert.Equal(3, buf.BytesAvailable());
synth.Init(44100);
synth.GetSamples(results, 0, results.Length);
Assert.All(results, r => Assert.Equal(0, r));
bytes = new byte [] { 0x90, 0x30, 100 }; // now give vel = 100
buf.Write(bytes, 0, bytes.Length);
synth.GetSamples(results, 0, results.Length);
Assert.Contains(results, r => r != 0);
// to see what's being generated, enable these lines.
//var str = string.Concat (results.Select (s => s.ToString ("X04")));
//Console.WriteLine (str);
}
}
}
void Run(string [] args)
{
ring_buffer = new RingBuffer();
synth = new SynthUnit(ring_buffer);
synth.Init(44100);
soundio = new SoundIO();
soundio.Connect();
soundio.FlushEvents();
Console.WriteLine("SoundIO backend: " + soundio.CurrentBackend);
// MIDI sender
var midi_wait = new ManualResetEvent(false);
Task.Run(() => {
midi_wait.WaitOne();
if (args.Length > 0)
{
var sysex = File.ReadAllBytes(args [0]);
int remaining = sysex.Length;
while (remaining > 0)
{
int len = Math.Min(remaining, ring_buffer.WriteBytesAvailable());
ring_buffer.Write(sysex, 0, len);
Task.Delay(50);
remaining -= len;
}
}
for (int i = 0; i < 10; i++)
{
byte [] bytes = { 0x90, (byte)(0x30 + i), 0x60 };
ring_buffer.Write(bytes, 0, 3);
System.Threading.Thread.Sleep(1000);
byte [] bytes2 = { 0x80, (byte)(0x30 + i), 0 };
ring_buffer.Write(bytes2, 0, 3);
}
});
// Audio outputter
var wait = new ManualResetEvent(false);
Task.Run(() => {
var device = soundio.GetOutputDevice(soundio.DefaultOutputDeviceIndex);
if (device.ProbeError != 0)
{
Console.Error.WriteLine($"Cannot probe device {device.Name}.");
return;
}
Console.WriteLine($"Output device: {device.Name}");
var outStream = device.CreateOutStream();
if (!device.SupportsFormat(SoundIOFormat.S16LE))
{
throw new NotSupportedException();
}
outStream.Format = SoundIOFormat.S16LE;
outStream.WriteCallback = (min, max) => WriteCallback(outStream, min, max);
outStream.UnderflowCallback = () => { Console.WriteLine("underflow"); };
outStream.ErrorCallback = () => {
Console.WriteLine($"ERROR at libsoundio: {outStream.LayoutErrorMessage}");
};
outStream.Open();
play_audio = true;
midi_wait.Set();
Task.Delay(50);
outStream.Start();
soundio.FlushEvents();
wait.WaitOne();
outStream.Dispose();
device.RemoveReference();
});
Console.Read();
play_audio = false;
wait.Set();
Console.WriteLine("Finishing up");
soundio.Dispose();
}
public DX7Synthesizer()
{
ring_buffer = new RingBuffer();
synth = new SynthUnit(ring_buffer);
synth.Init(44100);
}