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using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace PortMidi
{
public class MidiInput : MidiStream
{
public MidiInput(IntPtr stream, Int32 inputDevice)
: base(stream, inputDevice)
{
}
public bool HasData => PortMidiMarshal.Pm_Poll(stream) == MidiErrorType.GotData;
public int Read(byte[] buffer, int index, int length)
{
var gch = GCHandle.Alloc(buffer);
try
{
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, index);
int size = PortMidiMarshal.Pm_Read(stream, ptr, length);
if (size < 0)
{
throw new MidiException((MidiErrorType) size,
PortMidiMarshal.Pm_GetErrorText((MidiErrorType) size));
}
return size * 4;
}
finally
{
gch.Free();
}
}
public Event ReadEvent(byte[] buffer, int index, int length)
{
var gch = GCHandle.Alloc(buffer);
try
{
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, index);
int size = PortMidiMarshal.Pm_Read(stream, ptr, length);
if (size < 0)
{
throw new MidiException((MidiErrorType) size,
PortMidiMarshal.Pm_GetErrorText((MidiErrorType) size));
}
return new Event(Marshal.PtrToStructure<PmEvent>(ptr));
}
finally
{
gch.Free();
}
}
}
}
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