public static IReadOnlyList <MidiDevice> GetLaunchpads()
{
var devices = new List <AlsaMidiDevice>();
int card = -1;
while (NativeMethods.snd_card_next(ref card) >= 0 && card >= 0)
{
if (NativeMethods.snd_ctl_open(out var ctl, "hw:" + card, 0) < 0)
{
continue;
}
try
{
int device = -1;
while (NativeMethods.snd_ctl_rawmidi_next_device(ctl, ref device) >= 0 && device >= 0)
{
var info = new SndRawMIDIInfo {
Device = device
};
info.SubDevice = 0;
if (NativeMethods.snd_ctl_rawmidi_info(ctl, ref info) < 0)
{
continue;
}
for (int i = 0; i < info.SubDevicesCount; i++)
{
info.SubDevice = i;
info.Stream = 0;
if (NativeMethods.snd_ctl_rawmidi_info(ctl, ref info) < 0)
{
continue;
}
info.Stream = 1;
if (NativeMethods.snd_ctl_rawmidi_info(ctl, ref info) < 0)
{
continue;
}
string port = $"hw:{info.Card},{info.Device},{info.SubDevice}";
foreach (var deviceType in DeviceInfo.SupportedDevices)
{
if (info.Name.Contains(deviceType.MidiName) && info.Subname.Contains(deviceType.MidiSubName))
{
devices.Add(new AlsaMidiDevice(port, info.Name, deviceType.Type));
}
}
}
}
}
finally { NativeMethods.snd_ctl_close(ctl); }
}
return(devices);
}
public static extern int snd_ctl_rawmidi_info(IntPtr ctl, ref SndRawMIDIInfo midiInfo);