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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using static Ryujinx.Audio.Backends.SoundIo.Native.SoundIo;
namespace Ryujinx.Audio.Backends.SoundIo.Native
{
public class SoundIoOutStreamContext : IDisposable
{
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private unsafe delegate void WriteCallbackDelegate(IntPtr ctx, int frameCountMin, int frameCountMax);
private IntPtr _context;
private IntPtr _nameStored;
private Action<int, int> _writeCallback;
private WriteCallbackDelegate _writeCallbackNative;
public IntPtr Context => _context;
internal SoundIoOutStreamContext(IntPtr context)
{
_context = context;
_nameStored = IntPtr.Zero;
_writeCallback = null;
_writeCallbackNative = null;
}
private ref SoundIoOutStream GetOutContext()
{
unsafe
{
return ref Unsafe.AsRef<SoundIoOutStream>((SoundIoOutStream*)_context);
}
}
public string Name
{
get => Marshal.PtrToStringAnsi(GetOutContext().Name);
set
{
var context = GetOutContext();
if (_nameStored != IntPtr.Zero && context.Name == _nameStored)
{
Marshal.FreeHGlobal(_nameStored);
}
_nameStored = Marshal.StringToHGlobalAnsi(value);
GetOutContext().Name = _nameStored;
}
}
public SoundIoChannelLayout Layout
{
get => GetOutContext().Layout;
set => GetOutContext().Layout = value;
}
public SoundIoFormat Format
{
get => GetOutContext().Format;
set => GetOutContext().Format = value;
}
public int SampleRate
{
get => GetOutContext().SampleRate;
set => GetOutContext().SampleRate = value;
}
public float Volume
{
get => GetOutContext().Volume;
set => GetOutContext().Volume = value;
}
public int BytesPerFrame
{
get => GetOutContext().BytesPerFrame;
set => GetOutContext().BytesPerFrame = value;
}
public int BytesPerSample
{
get => GetOutContext().BytesPerSample;
set => GetOutContext().BytesPerSample = value;
}
public Action<int, int> WriteCallback
{
get { return _writeCallback; }
set
{
_writeCallback = value;
if (_writeCallback == null)
{
_writeCallbackNative = null;
}
else
{
_writeCallbackNative = (ctx, frameCountMin, frameCountMax) => _writeCallback(frameCountMin, frameCountMax);
}
GetOutContext().WriteCallback = Marshal.GetFunctionPointerForDelegate(_writeCallbackNative);
}
}
private static void CheckError(SoundIoError error)
{
if (error != SoundIoError.None)
{
throw new SoundIoException(error);
}
}
public void Open() => CheckError(soundio_outstream_open(_context));
public void Start() => CheckError(soundio_outstream_start(_context));
public void Pause(bool pause) => CheckError(soundio_outstream_pause(_context, pause));
public void SetVolume(double volume) => CheckError(soundio_outstream_set_volume(_context, volume));
public Span<SoundIoChannelArea> BeginWrite(ref int frameCount)
{
IntPtr arenas = default;
int nativeFrameCount = frameCount;
unsafe
{
var frameCountPtr = &nativeFrameCount;
var arenasPtr = &arenas;
CheckError(soundio_outstream_begin_write(_context, (IntPtr)arenasPtr, (IntPtr)frameCountPtr));
frameCount = *frameCountPtr;
return new Span<SoundIoChannelArea>((void*)arenas, Layout.ChannelCount);
}
}
public void EndWrite() => CheckError(soundio_outstream_end_write(_context));
protected virtual void Dispose(bool disposing)
{
if (_context != IntPtr.Zero)
{
soundio_outstream_destroy(_context);
_context = IntPtr.Zero;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~SoundIoOutStreamContext()
{
Dispose(false);
}
}
}
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