private void PlatformStop(bool immediate)
{
if (!SourceId.HasValue)
{
return;
}
AL.SourceStop(SourceId.Value);
ALHelper.CheckError("Failed to stop source.");
// Reset the SendFilter to 0 if we are NOT using reverb since sources are recycled
if (Controller.Efx.IsAvailable)
{
Controller.Efx.BindSourceToAuxiliarySlot(SourceId.Value, 0, 0, 0);
ALHelper.CheckError("Failed to unset reverb.");
AL.Source(SourceId.Value, ALSourcei.EfxDirectFilter, 0);
ALHelper.CheckError("Failed to unset filter.");
}
AL.Source(SourceId.Value, ALSourcei.Buffer, 0);
ALHelper.CheckError("Failed to free source from buffer.");
Controller.RecycleSource(SourceId.Value);
SourceId = null;
}
private void PlatformApply3D(AudioListener listener, AudioEmitter emitter)
{
if (!SourceId.HasValue)
{
return;
}
AL.GetListener(ALListener3f.Position, out float x, out float y, out float z);
ALHelper.CheckError("Failed to get source position.");
// get the emitter offset from origin
Vector3 posOffset = emitter.Position - listener.Position;
// set up orientation matrix
var orientation = Matrix4x4.CreateWorld(Vector3.Zero, listener.Forward, listener.Up);
// set up our final position and velocity according to orientation of listener
var finalPos = Vector3.Transform(new Vector3(x, y, z) + posOffset, orientation);
var finalVel = Vector3.Transform(emitter.Velocity, orientation);
// set the position based on relative positon
AL.Source(SourceId.Value, ALSource3f.Position, finalPos.X, finalPos.Y, finalPos.Z);
ALHelper.CheckError("Failed to set source position.");
AL.Source(SourceId.Value, ALSource3f.Velocity, finalVel.X, finalVel.Y, finalVel.Z);
ALHelper.CheckError("Failed to set source velocity.");
AL.Source(SourceId.Value, ALSourcef.ReferenceDistance, SoundEffect.DistanceScale);
ALHelper.CheckError("Failed to set source distance scale.");
AL.DopplerFactor(SoundEffect.DopplerScale);
ALHelper.CheckError("Failed to set Doppler scale.");
}
private SoundState PlatformGetState()
{
if (!SourceId.HasValue)
{
return(SoundState.Stopped);
}
var alState = AL.GetSourceState(SourceId.Value);
ALHelper.CheckError("Failed to get source state.");
switch (alState)
{
case ALSourceState.Initial:
case ALSourceState.Stopped:
SoundState = SoundState.Stopped;
break;
case ALSourceState.Paused:
SoundState = SoundState.Paused;
break;
case ALSourceState.Playing:
SoundState = SoundState.Playing;
break;
}
return(SoundState);
}
private void PlatformSetPitch(float value)
{
if (SourceId.HasValue)
{
AL.Source(SourceId.Value, ALSourcef.Pitch, value);
ALHelper.CheckError("Failed to set source pitch.");
}
}
private void PlatformSetPan(float value)
{
if (SourceId.HasValue)
{
AL.Source(SourceId.Value, ALSource3f.Position, value, 0f, 0.1f);
ALHelper.CheckError("Failed to set source pan.");
}
}
private void PlatformSetVolume(float value)
{
_alVolume = value;
if (SourceId.HasValue)
{
AL.Source(SourceId.Value, ALSourcef.Gain, _alVolume);
ALHelper.CheckError("Failed to set source volume.");
}
}
private void PlatformSetIsLooped(bool value)
{
_looped = value;
if (SourceId.HasValue)
{
AL.Source(SourceId.Value, ALSourceb.Looping, _looped);
ALHelper.CheckError("Failed to set source loop state.");
}
}
private void ApplyReverb()
{
if (_reverb <= 0f || SoundEffect.ReverbSlot == 0)
{
return;
}
Controller.Efx.BindSourceToAuxiliarySlot(SourceId !.Value, (int)SoundEffect.ReverbSlot, 0, 0);
ALHelper.CheckError("Failed to set reverb.");
}
private void PlatformCreate()
{
PlatformInitialize();
SourceId = Controller.ReserveSource();
// Ensure that the source is not looped (due to source recycling)
AL.Source(SourceId.Value, ALSourceb.Looping, false);
ALHelper.CheckError("Failed to set source loop state.");
}
private void PlatformPause()
{
if (!SourceId.HasValue || SoundState != SoundState.Playing)
{
return;
}
AL.SourcePause(SourceId.Value);
ALHelper.CheckError("Failed to pause source.");
SoundState = SoundState.Paused;
}
public void RecycleSource(uint sourceId)
{
AL.Source(sourceId, ALSourcei.Buffer, 0);
ALHelper.CheckError("Failed to free source from buffers.");
lock (_availableSources)
{
if (_sourcesInUse.Remove(sourceId))
{
_availableSources.Enqueue(sourceId);
}
}
}
private void PlatformResume()
{
if (!SourceId.HasValue)
{
PlatformPlay();
return;
}
if (SoundState == SoundState.Paused)
{
AL.SourcePlay(SourceId.Value);
ALHelper.CheckError("Failed to play source.");
SoundState = SoundState.Playing;
}
}
private void PlatformStop()
{
AL.SourceStop(SourceId.Value);
ALHelper.CheckError("Failed to stop the source.");
// Remove all queued buffers
AL.Source(SourceId.Value, ALSourcei.Buffer, 0);
ALHelper.CheckError("Failed to unbind the buffer.");
lock (_queuedBuffers)
{
while (_queuedBuffers.Count > 0)
{
var buffer = _queuedBuffers.Dequeue();
ALBufferPool.Return(buffer);
}
}
}
public void ClearBuffer()
{
if (IsDisposed || BufferId == 0)
{
return;
}
bool isBuffer = AL.IsBuffer(BufferId);
ALHelper.CheckError("Failed to fetch buffer state.");
if (isBuffer)
{
AL.DeleteBuffer(BufferId);
BufferId = 0;
ALHelper.CheckError("Failed to delete buffer.");
}
}
private void PlatformPlay()
{
if (!SourceId.HasValue)
{
SourceId = Controller.ReserveSource();
}
AL.Source(SourceId.Value, ALSourcei.Buffer, _effect !.SoundBuffer !.BufferId);
ALHelper.CheckError("Failed to bind buffer to source.");
// update the position, gain, looping, pitch, and distance model
AL.Source(SourceId.Value, ALSourcei.SourceRelative, 1);
ALHelper.CheckError("Failed set source relative.");
AL.DistanceModel(ALDistanceModel.InverseDistanceClamped);
ALHelper.CheckError("Failed set source distance.");
AL.Source(SourceId.Value, ALSource3f.Position, _pan, 0f, 0f);
ALHelper.CheckError("Failed to set source pan.");
AL.Source(SourceId.Value, ALSource3f.Velocity, 0f, 0f, 0f);
ALHelper.CheckError("Failed to set source pan.");
AL.Source(SourceId.Value, ALSourcef.Gain, _alVolume);
ALHelper.CheckError("Failed to set source volume.");
AL.Source(SourceId.Value, ALSourceb.Looping, IsLooped);
ALHelper.CheckError("Failed to set source loop state.");
AL.Source(SourceId.Value, ALSourcef.Pitch, _pitch);
ALHelper.CheckError("Failed to set source pitch.");
ApplyReverb();
ApplyFilter();
AL.SourcePlay(SourceId.Value);
ALHelper.CheckError("Failed to play source.");
SoundState = SoundState.Playing;
}
private void ApplyFilter()
{
if (!_needsFilterUpdate || Controller.Filter == 0)
{
return;
}
float freq = _frequency / 20000f;
float lf = 1f - freq;
var efx = Controller.Efx;
efx.Filter(Controller.Filter, EfxFilteri.FilterType, (int)_filterType);
ALHelper.CheckError("Failed to set filter.");
switch (_filterType)
{
case EfxFilterType.Lowpass:
efx.Filter(Controller.Filter, EfxFilterf.LowpassGainHF, freq);
ALHelper.CheckError("Failed to set LowpassGainHF.");
break;
case EfxFilterType.Highpass:
efx.Filter(Controller.Filter, EfxFilterf.HighpassGainLF, freq);
ALHelper.CheckError("Failed to set HighpassGainLF.");
break;
case EfxFilterType.Bandpass:
efx.Filter(Controller.Filter, EfxFilterf.BandpassGainHF, freq);
ALHelper.CheckError("Failed to set BandpassGainHF.");
efx.Filter(Controller.Filter, EfxFilterf.BandpassGainLF, lf);
ALHelper.CheckError("Failed to set BandpassGainLF.");
break;
}
AL.Source(SourceId !.Value, ALSourcei.EfxDirectFilter, Controller.Filter);
ALHelper.CheckError("Failed to set DirectFilter.");
_needsFilterUpdate = false;
}
public void BufferData <T>(
ReadOnlySpan <T> data, ALFormat format, int sampleRate, int sampleAlignment = 0)
where T : unmanaged
{
AssertNotDisposed();
var controller = ALController.Get();
if (!controller.SupportsFloat32 && (format == ALFormat.MonoFloat32 || format == ALFormat.StereoFloat32))
{
throw new InvalidOperationException("Float data is not supported by this OpenAL driver.");
}
if (!controller.SupportsAdpcm && (format == ALFormat.MonoMSAdpcm || format == ALFormat.StereoMSAdpcm))
{
throw new InvalidOperationException("MS-ADPCM is not supported by this OpenAL driver.");
}
if (!controller.SupportsIma4 && (format == ALFormat.MonoIma4 || format == ALFormat.StereoIma4))
{
throw new InvalidOperationException("IMA/ADPCM is not supported by this OpenAL driver.");
}
if (BufferId != 0)
{
ClearBuffer();
}
BufferId = AL.GenBuffer();
ALHelper.CheckError("Failed to generate OpenAL data buffer.");
if (sampleAlignment > 0)
{
AL.Bufferi(BufferId, ALBufferi.UnpackBlockAlignmentSoft, sampleAlignment);
ALHelper.CheckError("Failed to set buffer alignment.");
}
AL.BufferData(BufferId, format, MemoryMarshal.AsBytes(data), sampleRate);
ALHelper.CheckError("Failed to fill buffer.");
}
/// <summary>
/// Sets up the hardware resources used by the controller.
/// </summary>
private ALController()
{
if (AL.NativeLibrary == IntPtr.Zero)
{
throw new DllNotFoundException(
"Couldn't initialize OpenAL because the native binaries couldn't be found.");
}
if (!Open())
{
throw new AudioHardwareException(
"OpenAL device could not be initialized, see console output for details.");
}
Efx = new EffectsExtension(Device);
if (ALC.IsExtensionPresent(Device, "ALC_EXT_CAPTURE"))
{
Microphone.PopulateCaptureDevices();
}
// We have hardware here and it is ready
_allSources = new uint[MaxNumberOfSources];
AL.GenSources(_allSources);
ALHelper.CheckError("Failed to generate sources.");
// TODO: allow more effects
if (Efx.IsAvailable)
{
Filter = Efx.GenFilter();
}
_availableSources = new Queue <uint>(_allSources);
_sourcesInUse = new HashSet <uint>();
}
/// <summary>
/// Disposes the <see cref="ALController"/>.
/// </summary>
/// <param name="disposing">If true, the managed resources are to be disposed.</param>
private void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
Streamer.Dispose();
if (Filter != 0 && Efx.IsAvailable)
{
Efx.DeleteFilter(Filter);
}
SoundEffectInstancePool.DisposeInstances();
AL.DeleteSources(_allSources);
ALHelper.CheckError("Failed to delete source.");
Microphone.StopMicrophones();
DestroyContexts();
}
_isDisposed = true;
}
}
public double GetSourceCurrentPosition(uint sourceId)
{
AL.GetSource(sourceId, ALGetSourcei.SampleOffset, out int pos);
ALHelper.CheckError("Failed to set source offset.");
return(pos);
}
private void PlatformResume()
{
AL.SourcePlay(SourceId.Value);
ALHelper.CheckError("Failed to play the source.");
}
private void PlatformPause()
{
AL.SourcePause(SourceId.Value);
ALHelper.CheckError("Failed to pause the source.");
}