MoonWorks/src/Audio/StaticSound.cs

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C#
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2021-01-20 03:26:30 +00:00
using System;
using System.IO;
using System.Runtime.InteropServices;
namespace MoonWorks.Audio
{
public class StaticSound : Sound, IDisposable
{
internal FAudio.FAudioBuffer Handle;
private bool IsDisposed;
public uint LoopStart { get; set; } = 0;
public uint LoopLength { get; set; } = 0;
public static StaticSound FromOgg(FileInfo fileInfo)
{
var filePointer = FAudio.stb_vorbis_open_filename(fileInfo.FullName, out var error, IntPtr.Zero);
if (error != 0)
{
throw new AudioLoadException("Error loading file!");
}
var info = FAudio.stb_vorbis_get_info(filePointer);
var bufferSize = (uint)(info.sample_rate * info.channels);
var buffer = new float[bufferSize];
FAudio.stb_vorbis_close(filePointer);
return new StaticSound(
buffer,
0,
(ushort) info.channels,
info.sample_rate
);
}
public StaticSound(
float[] buffer,
uint bufferOffset,
ushort channels,
uint samplesPerSecond
) : base(channels, samplesPerSecond) {
var bufferLength = 4 * buffer.Length;
Handle = new FAudio.FAudioBuffer();
Handle.Flags = FAudio.FAUDIO_END_OF_STREAM;
Handle.pContext = IntPtr.Zero;
Handle.AudioBytes = (uint) bufferLength;
Handle.pAudioData = Marshal.AllocHGlobal((int) bufferLength);
Marshal.Copy(buffer, (int) bufferOffset, Handle.pAudioData, (int) bufferLength);
Handle.PlayBegin = 0;
Handle.PlayLength = (
Handle.AudioBytes /
(uint) Format.nChannels /
(uint) (Format.wBitsPerSample / 8)
);
}
protected virtual void Dispose(bool disposing)
{
if (!IsDisposed)
{
if (disposing)
{
// dispose managed state (managed objects)
}
Marshal.FreeHGlobal(Handle.pAudioData);
IsDisposed = true;
}
}
// override finalizer only if 'Dispose(bool disposing)' has code to free unmanaged resources
~StaticSound()
{
// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
Dispose(disposing: false);
}
public void Dispose()
{
// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
Dispose(disposing: true);
GC.SuppressFinalize(this);
}
}
}