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using System;
using System.Runtime.InteropServices;
namespace PortMidi
{
public class MidiOutput : MidiStream
{
public MidiOutput(IntPtr stream, Int32 outputDevice, int latency)
: base(stream, outputDevice)
{
}
public void Write(MidiEvent midiEvent)
{
if (midiEvent.SysEx != null)
{
WriteSysEx(midiEvent.Timestamp, midiEvent.SysEx);
}
else
{
Write(midiEvent.Timestamp, midiEvent.Message);
}
}
private void Write(Int32 when, MidiMessage msg)
{
var ret = PortMidiMarshal.Pm_WriteShort(stream, when, msg);
if (ret != MidiErrorType.NoError)
{
throw new MidiException(ret,
$"Failed to write message {msg.Value} : {PortMidiMarshal.Pm_GetErrorText((MidiErrorType) ret)}");
}
}
private void WriteSysEx(Int32 when, byte[] sysEx)
{
var ret = PortMidiMarshal.Pm_WriteSysEx(stream, when, sysEx);
if (ret != MidiErrorType.NoError)
throw new MidiException(ret,
$"Failed to write sysEx message : {PortMidiMarshal.Pm_GetErrorText((MidiErrorType) ret)}");
}
public void Write(MidiEvent[] buffer)
{
Write(buffer, 0, buffer.Length);
}
private void Write(MidiEvent[] buffer, int index, int length)
{
var gch = GCHandle.Alloc(buffer);
try
{
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, index);
var ret = PortMidiMarshal.Pm_Write(stream, ptr, length);
if (ret != MidiErrorType.NoError)
{
throw new MidiException(ret,
$"Failed to write messages : {PortMidiMarshal.Pm_GetErrorText((MidiErrorType) ret)}");
}
}
finally
{
gch.Free();
}
}
}
}
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