/// <summary>
/// Open the IR device and begin reading.
/// </summary>
protected void CaptureFromDevice()
{
if (!System.Threading.Monitor.TryEnter(_capturingLocker))
{
throw new InvalidOperationException("Capture already in progress.");
}
try
{
OnBeforeRawCapture();
if (string.IsNullOrWhiteSpace(CaptureDevice))
{
throw new ArgumentNullException(nameof(CaptureDevice), $"The capture device must be set.");
}
using (var irDevice = _fileSystem.OpenRead(CaptureDevice))
{
DeviceFeatures deviceFeatures = _utility.GetFeatures(irDevice);
CheckDevice(irDevice, deviceFeatures);
if (TimeoutMicrosecs >= 0)
{
_utility.SetRxTimeout(irDevice, TimeoutMicrosecs);
}
byte[] buffer = new byte[4];
while (true)
{
int readCount = irDevice.Stream.Read(buffer, 0, buffer.Length); // Note if "modprobe -r gpio_ir_recv" is used to unload the driver while this is reading then we get an IOException.
if (readCount != 4)
{
throw new System.IO.IOException($"Read {readCount} bytes instead of the expected 4.");
}
Mode2PacketType packetType = (Mode2PacketType)buffer[3];
buffer[3] = 0;
Lazy <int> number = new Lazy <int>(() => BitConverter.ToInt32(buffer));
if (!OnReceivePacket(packetType, number))
{
return;
}
}
}
}
finally
{
System.Threading.Monitor.Exit(_capturingLocker);
}
}
/// <returns> /// Return TRUE to continue capturing IR or FALSE to stop. /// </returns> protected abstract bool OnReceivePacket(Mode2PacketType packetType, Lazy <int> packetData);
public UnknownPacketTypeException(Mode2PacketType type) : base($"Unknown packet type {type}.")
{
Mode2PacketType = (byte)type;
}
