public override void Start()
{
_outputStream.Start();
_outputStream.Pause(false);
_driver.FlushContextEvents();
}
static void WriteCallback(SoundIOOutStream stream, int frameCountMin, int frameCountMax)
{
double floatSampleRate = stream.SampleRate;
double secondsPerFrame = 1.0 / floatSampleRate;
SoundIOChannelAreas areas;
SoundIoError err;
int framesLeft = frameCountMax;
while (true)
{
int frameCount = framesLeft;
err = stream.BeginWrite(out areas, ref frameCount);
if (err != SoundIoError.None)
{
throw new SoundIOException(string.Format("Unrecoverable stream error: {0}.", err.GetErrorMessage()));
}
if (areas == null || frameCount == 0)
{
break;
}
SoundIOChannelLayout layout = stream.Layout;
double pitch = 440.0;
double radiansPerSecond = pitch * 2.0 * Math.PI;
for (int frame = 0; frame < frameCount; frame++)
{
double sample = Math.Sin((secondsOffset + frame * secondsPerFrame) * radiansPerSecond);
for (int channel = 0; channel < layout.ChannelCount; channel += 1)
{
writeSample(areas[channel].Pointer, sample);
areas[channel].AdvancePointer();
}
}
secondsOffset = (secondsOffset + secondsPerFrame * frameCount) % 1.0;
err = stream.EndWrite();
if (err != SoundIoError.None)
{
Console.WriteLine("EndWrite failed with error: {0}.", err);
if (err == SoundIoError.Underflow)
{
return;
}
throw new SoundIOException(string.Format("Unrecoverable stream error: {0}.", err.GetErrorMessage()));
}
framesLeft -= frameCount;
if (framesLeft <= 0)
{
break;
}
}
stream.Pause(wantPause);
}
static void write_callback(SoundIOOutStream outstream, int frame_count_min, int frame_count_max)
{
double float_sample_rate = outstream.SampleRate;
double seconds_per_frame = 1.0 / float_sample_rate;
int frames_left = frame_count_max;
int frame_count = 0;
for (; ;)
{
frame_count = frames_left;
var results = outstream.BeginWrite(ref frame_count);
if (frame_count == 0)
{
break;
}
SoundIOChannelLayout layout = outstream.Layout;
double pitch = 440.0;
double radians_per_second = pitch * 2.0 * Math.PI;
for (int frame = 0; frame < frame_count; frame += 1)
{
double sample = Math.Sin((seconds_offset + frame * seconds_per_frame) * radians_per_second);
for (int channel = 0; channel < layout.ChannelCount; channel += 1)
{
var area = results.GetArea(channel);
write_sample(area.Pointer, sample);
area.Pointer += area.Step;
}
}
seconds_offset = Math.IEEERemainder(seconds_offset + seconds_per_frame * frame_count, 1.0);
outstream.EndWrite();
frames_left -= frame_count;
if (frames_left <= 0)
{
break;
}
}
outstream.Pause(want_pause);
}
public static int Main(string[] args)
{
string exe = "SoundIOSine";
SoundIoBackend backend = SoundIoBackend.None;
string deviceId = null;
bool raw = false;
string streamName = null;
double latency = 0.0;
int sampleRate = 0;
SoundIoError err;
SoundIODevice device = null;
for (int i = 0; i < args.Length; i++)
{
string arg = args[i];
if (arg.StartsWith("--"))
{
if (arg.CompareTo("--raw") == 0)
{
raw = true;
}
else
{
i++;
if (i >= args.Length)
{
return(Usage(exe));
}
else if (arg.CompareTo("--backend") == 0)
{
backend = (SoundIoBackend)Enum.Parse(typeof(SoundIoBackend), args[i]);
}
else if (arg.CompareTo("--device") == 0)
{
deviceId = args[i];
}
else if (arg.CompareTo("--name") == 0)
{
streamName = args[i];
}
else if (arg.CompareTo("--latency") == 0)
{
latency = double.Parse(args[i]);
}
else if (arg.CompareTo("--sample-rate") == 0)
{
sampleRate = int.Parse(args[i]);
}
else
{
return(Usage(exe));
}
}
}
else
{
return(Usage(exe));
}
}
SoundIO soundIo = new SoundIO();
err = (backend == SoundIoBackend.None) ?
soundIo.Connect() : soundIo.ConnectBackend(backend);
if (err != SoundIoError.None)
{
Console.Error.WriteLine("Unable to connect to backend: {0}.", err.GetErrorMessage());
return(1);
}
Console.WriteLine("Backend: {0}.", soundIo.CurrentBackend);
soundIo.FlushEvents();
if (deviceId != null)
{
foreach (var dev in soundIo)
{
if (dev.Aim == SoundIoDeviceAim.Output && dev.Id.Equals(deviceId) && dev.IsRaw == raw)
{
device = dev;
break;
}
}
if (device == null)
{
Console.Error.WriteLine("Output device not found.");
return(1);
}
device.AddRef(); // Enumerator cleans up itself on dispose
}
else
{
device = soundIo.GetDefaultOutputDevice();
}
Console.WriteLine("Output device: {0}.", device.Name);
if (device.ProbeError != SoundIoError.None)
{
Console.Error.WriteLine("Cannot probe device: {0}.", device.ProbeError.GetErrorMessage());
return(1);
}
SoundIOOutStream outstream = new SoundIOOutStream(device);
outstream.OnWriteCallback = WriteCallback;
outstream.OnUnderflowCallback = UnderflowCallback;
if (streamName != null)
{
outstream.Name = streamName;
}
outstream.SoftwareLatency = latency;
if (sampleRate != 0)
{
outstream.SampleRate = sampleRate;
}
if (device.SupportsFormat(SoundIoFormats.Float32NE))
{
outstream.Format = SoundIoFormats.Float32NE;
writeSample = WriteSampleFloat32NE;
}
else if (device.SupportsFormat(SoundIoFormats.Float64NE))
{
outstream.Format = SoundIoFormats.Float64NE;
writeSample = WriteSampleFloat64NE;
}
else if (device.SupportsFormat(SoundIoFormats.S32NE))
{
outstream.Format = SoundIoFormats.S32NE;
writeSample = WriteSampleS32NE;
}
else if (device.SupportsFormat(SoundIoFormats.S16NE))
{
outstream.Format = SoundIoFormats.S16NE;
writeSample = WriteSampleS16NE;
}
else
{
Console.Error.WriteLine("No suitable format available.");
return(1);
}
err = outstream.Open();
if (err != SoundIoError.None)
{
Console.Error.WriteLine("Unable to open device: {0}.", err.GetErrorMessage());
return(1);
}
Console.WriteLine("Software latency: {0:N6}.", outstream.SoftwareLatency);
Console.WriteLine(
"\t'p' - pause\n" +
"\t'u' - unpause\n" +
"\t'P' - pause from within callback\n" +
"\t'c' - clear buffer\n" +
"\t'q' - quit\n");
if (outstream.LayoutError != SoundIoError.None)
{
Console.Error.WriteLine("Unable to set channel layout: {0}.", outstream.LayoutError.GetErrorMessage());
}
err = outstream.Start();
if (err != SoundIoError.None)
{
Console.Error.WriteLine("Unable to start device {0}.", err.GetErrorMessage());
return(1);
}
while (true)
{
soundIo.FlushEvents();
int c = Console.Read();
if (c == 'p')
{
err = outstream.Pause(true);
Console.Error.WriteLine("Pausing result: {0}.", err.GetErrorMessage());
}
else if (c == 'P')
{
wantPause = true;
}
else if (c == 'u')
{
wantPause = false;
err = outstream.Pause(false);
Console.Error.WriteLine("Unpausing result: {0}.", err.GetErrorMessage());
}
else if (c == 'c')
{
err = outstream.ClearBuffer();
Console.Error.WriteLine("Clear buffer result: {0}.", err.GetErrorMessage());
}
else if (c == 'q')
{
break;
}
else if (c == '\r' || c == '\n')
{
// ignore
}
else
{
Console.Error.WriteLine("Unrecognized command: {0}.", (char)c);
}
}
outstream.Dispose();
device.Release();
soundIo.Dispose();
return(0);
}
public static void WriteCallback(SoundIOOutStream stream, int frameCountMin, int frameCountMax)
{
SoundIoError err;
DateTime callbackTime = DateTime.Now;
// loop to utilize as much as the frameCountMax as possible
while (frameCountMax > 0)
{
int frameCount = frameCountMax;
if ((err = stream.BeginWrite(out SoundIOChannelAreas areas, ref frameCount)) != SoundIoError.None)
{
Console.WriteLine("unrecoverable stream error: {0}", err.GetErrorMessage());
_fileDone = true;
}
if (frameCount == 0)
{
break;
}
var bufferCount = frameCount * stream.Layout.ChannelCount;
// if buffer is done add silence based on latency to allow stream to complete through
// audio path before stream is Disposed()
if (_waveFile.Position >= _waveFile.Length)
{
if (_startSilence)
{
// windows latency is a little higher (using DateTime to determine the callback time delay)
// and needs to be accoutned for...
_latencySeconds -= (DateTime.Now - callbackTime).TotalMilliseconds / 1000.0;
_silentSamplesRemaining = (int)((stream.SampleRate * stream.Layout.ChannelCount) * _latencySeconds);
_silentSamplesRemaining -= _silentSamplesAlreadySent;
_startSilence = false;
}
int silentBufferSize;
if (_silentSamplesRemaining > bufferCount)
{
silentBufferSize = bufferCount;
_silentSamplesRemaining -= bufferCount;
}
else
{
silentBufferSize = _silentSamplesRemaining;
_silentSamplesRemaining = 0;
}
if (silentBufferSize > 0)
{
// create a new buffer initialized to 0 and copy to native buffer
var silenceBuffer = new float[silentBufferSize];
stream.CopyTo(silenceBuffer, 0, areas, silentBufferSize);
}
if (_silentSamplesRemaining == 0)
{
_fileDone = true;
stream.EndWrite();
stream.Pause(true);
return;
}
// if the remaining audioBuffer will only partially fill the frameCount
// copy the remaining amount and set the startSilence flag to allow
// stream to play to the end.
}
else if (_waveFile.Position + (frameCount * _waveFile.WaveFormat.Channels) >= _waveFile.Length)
{
float[] audioBuffer = new float[bufferCount];
var actualSamplesRead = _sampleProvider.Read(audioBuffer, 0, bufferCount);
stream.CopyTo(audioBuffer, 0, areas, bufferCount);
_silentSamplesAlreadySent = bufferCount - actualSamplesRead;
_latencySeconds = 0.0;
_startSilence = true;
}
else
{
// copy audioBuffer data to native buffer and advance the bufferPos
float[] audioBuffer = new float[bufferCount];
var actualSamplesRead = _sampleProvider.Read(audioBuffer, 0, bufferCount);
stream.CopyTo(audioBuffer, 0, areas, actualSamplesRead);
if (_waveFile.Position >= _waveFile.Length)
{
_latencySeconds = 0.0;
_startSilence = true;
}
}
if ((err = stream.EndWrite()) != SoundIoError.None)
{
if (err == SoundIoError.Underflow)
{
return;
}
Console.WriteLine("Unrecoverable stream error: {0}", err.GetErrorMessage());
_fileDone = true;
}
if (_startSilence)
{
// get actual latency in order to compute number of silent frames
stream.GetLatency(out _latencySeconds);
callbackTime = DateTime.Now;
}
// loop until frameCountMax is used up
frameCountMax -= frameCount;
}
return;
}
