public AudioOutput(int channels = 1, int sampleRate = 44100)
{
if (channels < 1 || channels > 2)
{
throw new ArgumentOutOfRangeException(nameof(channels));
}
if (sampleRate < 2000 || sampleRate > 200000)
{
throw new ArgumentOutOfRangeException(nameof(sampleRate));
}
try
{
al = AL.GetApi(true);
alContext = ALContext.GetApi(true);
}
catch
{
al = AL.GetApi(false);
alContext = ALContext.GetApi(false);
}
device = alContext.OpenDevice("");
Available = device != null;
if (Available)
{
context = alContext.CreateContext(device, null);
alContext.MakeContextCurrent(context);
if (al.GetError() != AudioError.NoError)
{
Available = false;
if (context != null)
{
alContext.DestroyContext(context);
}
alContext.CloseDevice(device);
al.Dispose();
alContext.Dispose();
disposed = true;
return;
}
source = al.GenSource();
al.SetSourceProperty(source, SourceBoolean.Looping, true);
al.SetSourceProperty(source, SourceFloat.Gain, 1.0f);
}
}
private unsafe float InitSound(float elapsedSinceLastCall, float elapsedTimeSinceLastFlightLoop, int counter)
{
CheckError();
// We have to save the old context and restore it later, so that we don't interfere with X-Plane
// and other plugins.
var oldContext = _alc.GetCurrentContext();
// Try to create our own default device and context. If we fail, we're dead, we won't play any sound.
_device = _alc.OpenDevice(null);
if (_device == null)
{
XPlane.Trace.WriteLine("[OpenAL Sample] Could not open the default OpenAL device.");
return(0);
}
_context = _alc.CreateContext(_device, null);
if (_context == null)
{
if (oldContext != null)
{
_alc.MakeContextCurrent(oldContext);
}
_alc.CloseDevice(_device);
_device = null;
XPlane.Trace.WriteLine("[OpenAL Sample] Could not create a context.");
return(0);
}
// Make our context current, so that OpenAL commands affect our, um, stuff.
_alc.MakeContextCurrent(_context);
var path = Path.Combine(Path.GetDirectoryName(PluginInfo.ThisPlugin.FilePath), "sound.wav");
// Generate 1 source and load a buffer of audio.
_soundSource = _al.GenSource();
CheckError();
_soundBuffer = WavHelper.LoadWav(path, _al);
XPlane.Trace.WriteLine($"[OpenAL Sample] Loaded {_soundBuffer} from {path}.");
// Basic initialization code to play a sound: specify the buffer the source is playing, as well as some
// sound parameters. This doesn't play the sound - it's just one-time initialization.
_al.SetSourceProperty(_soundSource, SourceInteger.Buffer, _soundBuffer);
_al.SetSourceProperty(_soundSource, SourceFloat.Pitch, 1f);
_al.SetSourceProperty(_soundSource, SourceFloat.Gain, 1f);
_al.SetSourceProperty(_soundSource, SourceBoolean.Looping, false);
_al.SetSourceProperty(_soundSource, SourceVector3.Position, Vector3.Zero);
_al.SetSourceProperty(_soundSource, SourceVector3.Velocity, Vector3.Zero);
CheckError();
// Finally: put back the old context _if_ we had one. If old_ctx was null, X-Plane isn't using OpenAL.
if (oldContext != null)
{
_alc.MakeContextCurrent(oldContext);
}
return(0);
}
private unsafe float InitSound(float elapsedSinceLastCall, float elapsedTimeSinceLastFlightLoop, int counter)
{
CheckError();
var oldContext = _alc.GetCurrentContext();
if (oldContext == null)
{
XPlane.Trace.WriteLine("[OpenAL Sample] I found no OpenAL, I will be the first to init.");
_device = _alc.OpenDevice(null);
if (_device == null)
{
XPlane.Trace.WriteLine("[OpenAL Sample] Could not open the default OpenAL device.");
return(0);
}
_context = _alc.CreateContext(_device, null);
if (_context == null)
{
_alc.CloseDevice(_device);
_device = null;
XPlane.Trace.WriteLine("[OpenAL Sample] Could not open the default OpenAL device.");
return(0);
}
_alc.MakeContextCurrent(_context);
XPlane.Trace.WriteLine("[OpenAL Sample] Created the Open AL context.");
var hardware = _alc.GetContextProperty(_device, GetContextString.DeviceSpecifier);
var extensions = _alc.GetContextProperty(_device, GetContextString.Extensions);
int major, minor;
_alc.GetContextProperty(_device, GetContextInteger.MajorVersion, 1, &major);
_alc.GetContextProperty(_device, GetContextInteger.MinorVersion, 1, &minor);
XPlane.Trace.WriteLine($"[OpenAL Sample] OpenAL version : {major}.{minor}");
XPlane.Trace.WriteLine($"[OpenAL Sample] OpenAL hardware : {hardware}");
XPlane.Trace.WriteLine($"[OpenAL Sample] OpenAL extensions: {extensions}");
CheckError();
}
else
{
XPlane.Trace.WriteLine($"[OpenAL Sample] I found someone else's context: {(ulong)oldContext:X8}");
}
var path = Path.Combine(Path.GetDirectoryName(PluginInfo.ThisPlugin.FilePath), "sound.wav");
// Generate 1 source and load a buffer of audio.
_soundSource = _al.GenSource();
CheckError();
_soundBuffer = WavHelper.LoadWav(path, _al);
XPlane.Trace.WriteLine($"[OpenAL Sample] Loaded {_soundBuffer} from {path}.");
// Basic initialization code to play a sound: specify the buffer the source is playing, as well as some
// sound parameters. This doesn't play the sound - it's just one-time initialization.
_al.SetSourceProperty(_soundSource, SourceInteger.Buffer, _soundBuffer);
_al.SetSourceProperty(_soundSource, SourceFloat.Pitch, 1f);
_al.SetSourceProperty(_soundSource, SourceFloat.Gain, 1f);
_al.SetSourceProperty(_soundSource, SourceBoolean.Looping, false);
_al.SetSourceProperty(_soundSource, SourceVector3.Position, Vector3.Zero);
_al.SetSourceProperty(_soundSource, SourceVector3.Velocity, Vector3.Zero);
CheckError();
return(0);
}