MoonWorks/src/Audio/SoundInstance.cs

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using System;
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using System.Runtime.InteropServices;
namespace MoonWorks.Audio
{
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public abstract class SoundInstance : AudioResource
{
internal IntPtr Handle;
internal FAudio.FAudioWaveFormatEx Format;
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protected FAudio.F3DAUDIO_DSP_SETTINGS dspSettings;
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public bool Is3D { get; protected set; }
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public virtual SoundState State { get; protected set; }
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private float _pan = 0;
public float Pan
{
get => _pan;
set
{
_pan = value;
if (_pan < -1f)
{
_pan = -1f;
}
if (_pan > 1f)
{
_pan = 1f;
}
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if (Is3D) { return; }
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SetPanMatrixCoefficients();
FAudio.FAudioVoice_SetOutputMatrix(
Handle,
Device.MasteringVoice,
dspSettings.SrcChannelCount,
dspSettings.DstChannelCount,
dspSettings.pMatrixCoefficients,
0
);
}
}
private float _pitch = 1;
public float Pitch
{
get => _pitch;
set
{
_pitch = Math.MathHelper.Clamp(value, -1f, 1f);
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UpdatePitch();
}
}
private float _volume = 1;
public float Volume
{
get => _volume;
set
{
_volume = value;
FAudio.FAudioVoice_SetVolume(Handle, _volume, 0);
}
}
private float _reverb;
public unsafe float Reverb
{
get => _reverb;
set
{
_reverb = value;
float* outputMatrix = (float*) dspSettings.pMatrixCoefficients;
outputMatrix[0] = _reverb;
if (dspSettings.SrcChannelCount == 2)
{
outputMatrix[1] = _reverb;
}
FAudio.FAudioVoice_SetOutputMatrix(
Handle,
Device.ReverbVoice,
dspSettings.SrcChannelCount,
1,
dspSettings.pMatrixCoefficients,
0
);
}
}
private float _lowPassFilter;
public float LowPassFilter
{
get => _lowPassFilter;
set
{
_lowPassFilter = value;
FAudio.FAudioFilterParameters p = new FAudio.FAudioFilterParameters
{
Type = FAudio.FAudioFilterType.FAudioLowPassFilter,
Frequency = _lowPassFilter,
OneOverQ = 1f
};
FAudio.FAudioVoice_SetFilterParameters(
Handle,
ref p,
0
);
}
}
private float _highPassFilter;
public float HighPassFilter
{
get => _highPassFilter;
set
{
_highPassFilter = value;
FAudio.FAudioFilterParameters p = new FAudio.FAudioFilterParameters
{
Type = FAudio.FAudioFilterType.FAudioHighPassFilter,
Frequency = _highPassFilter,
OneOverQ = 1f
};
FAudio.FAudioVoice_SetFilterParameters(
Handle,
ref p,
0
);
}
}
private float _bandPassFilter;
public float BandPassFilter
{
get => _bandPassFilter;
set
{
_bandPassFilter = value;
FAudio.FAudioFilterParameters p = new FAudio.FAudioFilterParameters
{
Type = FAudio.FAudioFilterType.FAudioBandPassFilter,
Frequency = _bandPassFilter,
OneOverQ = 1f
};
FAudio.FAudioVoice_SetFilterParameters(
Handle,
ref p,
0
);
}
}
public SoundInstance(
AudioDevice device,
ushort formatTag,
ushort bitsPerSample,
ushort blockAlign,
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ushort channels,
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uint samplesPerSecond
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) : base(device)
{
var format = new FAudio.FAudioWaveFormatEx
{
wFormatTag = formatTag,
wBitsPerSample = bitsPerSample,
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nChannels = channels,
nBlockAlign = blockAlign,
nSamplesPerSec = samplesPerSecond,
nAvgBytesPerSec = blockAlign * samplesPerSecond
};
Format = format;
FAudio.FAudio_CreateSourceVoice(
Device.Handle,
out Handle,
ref Format,
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FAudio.FAUDIO_VOICE_USEFILTER,
FAudio.FAUDIO_DEFAULT_FREQ_RATIO,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero
);
if (Handle == IntPtr.Zero)
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{
Logger.LogError("SoundInstance failed to initialize!");
return;
}
InitDSPSettings(Format.nChannels);
// FIXME: not everything should be running through reverb...
/*
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FAudio.FAudioVoice_SetOutputVoices(
Handle,
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ref Device.ReverbSends
);
*/
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State = SoundState.Stopped;
}
public void Apply3D(AudioListener listener, AudioEmitter emitter)
{
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Is3D = true;
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emitter.emitterData.CurveDistanceScaler = Device.CurveDistanceScalar;
emitter.emitterData.ChannelCount = dspSettings.SrcChannelCount;
FAudio.F3DAudioCalculate(
Device.Handle3D,
ref listener.listenerData,
ref emitter.emitterData,
FAudio.F3DAUDIO_CALCULATE_MATRIX | FAudio.F3DAUDIO_CALCULATE_DOPPLER,
ref dspSettings
);
UpdatePitch();
FAudio.FAudioVoice_SetOutputMatrix(
Handle,
Device.MasteringVoice,
dspSettings.SrcChannelCount,
dspSettings.DstChannelCount,
dspSettings.pMatrixCoefficients,
0
);
}
public abstract void Play();
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public abstract void Pause();
public abstract void Stop();
public abstract void StopImmediate();
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private void InitDSPSettings(uint srcChannels)
{
dspSettings = new FAudio.F3DAUDIO_DSP_SETTINGS();
dspSettings.DopplerFactor = 1f;
dspSettings.SrcChannelCount = srcChannels;
dspSettings.DstChannelCount = Device.DeviceDetails.OutputFormat.Format.nChannels;
int memsize = (
4 *
(int) dspSettings.SrcChannelCount *
(int) dspSettings.DstChannelCount
);
dspSettings.pMatrixCoefficients = Marshal.AllocHGlobal(memsize);
unsafe
{
byte* memPtr = (byte*) dspSettings.pMatrixCoefficients;
for (int i = 0; i < memsize; i += 1)
{
memPtr[i] = 0;
}
}
SetPanMatrixCoefficients();
}
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private void UpdatePitch()
{
float doppler;
float dopplerScale = Device.DopplerScale;
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if (!Is3D || dopplerScale == 0.0f)
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{
doppler = 1.0f;
}
else
{
doppler = dspSettings.DopplerFactor * dopplerScale;
}
FAudio.FAudioSourceVoice_SetFrequencyRatio(
Handle,
(float) System.Math.Pow(2.0, _pitch) * doppler,
0
);
}
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// Taken from https://github.com/FNA-XNA/FNA/blob/master/src/Audio/SoundEffectInstance.cs
private unsafe void SetPanMatrixCoefficients()
{
/* Two major things to notice:
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* 1. The spec assumes any speaker count >= 2 has Front Left/Right.
* 2. Stereo panning is WAY more complicated than you think.
* The main thing is that hard panning does NOT eliminate an
* entire channel; the two channels are blended on each side.
* -flibit
*/
float* outputMatrix = (float*) dspSettings.pMatrixCoefficients;
if (dspSettings.SrcChannelCount == 1)
{
if (dspSettings.DstChannelCount == 1)
{
outputMatrix[0] = 1.0f;
}
else
{
outputMatrix[0] = (_pan > 0.0f) ? (1.0f - _pan) : 1.0f;
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outputMatrix[1] = (_pan < 0.0f) ? (1.0f + _pan) : 1.0f;
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}
}
else
{
if (dspSettings.DstChannelCount == 1)
{
outputMatrix[0] = 1.0f;
outputMatrix[1] = 1.0f;
}
else
{
if (_pan <= 0.0f)
{
// Left speaker blends left/right channels
outputMatrix[0] = 0.5f * _pan + 1.0f;
outputMatrix[1] = 0.5f * -_pan;
// Right speaker gets less of the right channel
outputMatrix[2] = 0.0f;
outputMatrix[3] = _pan + 1.0f;
}
else
{
// Left speaker gets less of the left channel
outputMatrix[0] = -_pan + 1.0f;
outputMatrix[1] = 0.0f;
// Right speaker blends right/left channels
outputMatrix[2] = 0.5f * _pan;
outputMatrix[3] = 0.5f * -_pan + 1.0f;
}
}
}
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}
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protected override void Destroy()
{
StopImmediate();
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FAudio.FAudioVoice_DestroyVoice(Handle);
Marshal.FreeHGlobal(dspSettings.pMatrixCoefficients);
}
}
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}