void write_callback(SoundIOOutStream outstream, int frame_count_min, int frame_count_max)
{
int frameCount = frame_count_max;
if (frameCount <= 0)
{
return;
}
var results = outstream.BeginWrite(ref frameCount);
var samples = new float[frameCount];
var e = new OutputBufferEventArgs(frameCount);
Buffer?.Invoke(this, e);
if (e.Buffer != null)
{
ringBuffer.Enqueue(e.Buffer);
}
ringBuffer.Dequeue(samples, frameCount);
var layout = outstream.Layout;
for (int frame = 0; frame < frameCount; frame++)
{
for (int channel = 0; channel < layout.ChannelCount; channel++)
{
var area = results.GetArea(channel);
// Raspberry Piではなぜかshortじゃないと音がプツプツする
write_short_sample(area.Pointer, samples[frame]);
area.Pointer += area.Step;
}
}
outstream.EndWrite();
unsafe void write_short_sample(IntPtr ptr, float sample)
{
short *buf = (short *)ptr;
*buf = (short)(sample * short.MaxValue);
}
unsafe void write_float_sample(IntPtr ptr, float sample)
{
float *buf = (float *)ptr;
*buf = sample;
}
}
void underflow_callback(SoundIOOutStream outstream)
{
Underflow?.Invoke(this, EventArgs.Empty);
}
}
}
unsafe void write_callback(SoundIOOutStream outstream, int frame_count_min, int frame_count_max)
{
int frame_count = frame_count_max;
var results = outstream.BeginWrite(ref frame_count);
SoundIOChannelLayout layout = outstream.Layout;
int readBytes = frame_count * outstream.BytesPerFrame;
int readCount = 0;
int tryCount = -1;
int read;
while (readBytes - readCount > 0 && tryCount++ < UnderflowRetryCount)
{
int bufferLength = (int)_ringBuffer.GetLength();
if (bufferLength % outstream.BytesPerSample != 0)
{
bufferLength -= outstream.BytesPerSample - (bufferLength % outstream.BytesPerSample);
}
read = Math.Min(bufferLength, readBytes - readCount);
readCount += read;
byte[] buffer = new byte[read];
_ringBuffer.Dequeue(buffer);
SoundIOChannelArea area;
fixed(byte *buf = buffer)
{
byte *ptr;
for (var i = 0; i < buffer.Length; i += outstream.BytesPerSample * layout.ChannelCount)
{
for (int channel = 0; layout.ChannelCount > channel; channel++)
{
area = results.GetArea(channel);
ptr = (byte *)area.Pointer;
for (int j = 0; j < outstream.BytesPerSample; j++)
{
*ptr = buf[i + j + (channel * outstream.BytesPerSample)];
ptr++;
}
area.Pointer += area.Step;
}
}
}
if (readBytes - readCount > 0)
{
Underflow?.Invoke(this, new UnderflowEventArgs(readBytes - readCount));
}
}
outstream.EndWrite();
}
private void initInternal(AudioFormat format)
{
if (Device == null)
{
throw new Exception("No device is selected");
}
if (Device.ProbeError != 0)
{
throw new OutputInitializationException($"Probe Error : {Device.ProbeError}");
}
_outstream = Device.CreateOutStream();
_outstream.WriteCallback = (min, max) => write_callback(_outstream, min, max);
_outstream.UnderflowCallback = () => Underflow?.Invoke(this, new UnderflowEventArgs(null));
_outstream.ErrorCallback = () => UnrecoverableError?.Invoke(this, EventArgs.Empty);
_outstream.SampleRate = format.SampleRate;
_outstream.SoftwareLatency = DesiredLatency.TotalSeconds;
var soundioFormat = Soundio.ToSoundioFormat(format);
_outstream.Format = soundioFormat ?? SoundIOFormat.Invalid;
if (_outstream.LayoutErrorMessage != null)
{
var msg = _outstream.LayoutErrorMessage;
Console.WriteLine($"Channel Layout Error : {msg}");
}
_outstream.Open();
_api.FlushEvents();
Format = Soundio.ToManagedFormat(_outstream.Format, _outstream.SampleRate, _outstream.Layout.ChannelCount);
SoftwareLatency = TimeSpan.FromSeconds(_outstream.SoftwareLatency);
var bytesPerSample = _outstream.BytesPerSample;
var capacity = Format.SampleRate * Format.Channels * bytesPerSample *
_bufferDuration.TotalSeconds;
_ringBuffer = new RingBuffer <byte>((uint)capacity);
}
protected override async Task BeforeEach()
{
underflow = await Underflow.New(RpcClient);
// Peform contract deployments and other test setup.
}