public void Start()
{
if (IsRunning)
{
return;
}
if (_timerId == NoTimerId)
{
var timeCaps = default(MidiTimerWinApi.TIMECAPS);
ProcessMmResult(MidiTimerWinApi.timeGetDevCaps(ref timeCaps, (uint)Marshal.SizeOf(timeCaps)));
_resolution = Math.Min(Math.Max(timeCaps.wPeriodMin, _interval), timeCaps.wPeriodMax);
_tickCallback = OnTick;
ProcessMmResult(MidiTimerWinApi.timeBeginPeriod(_resolution));
_timerId = MidiTimerWinApi.timeSetEvent(_interval, _resolution, _tickCallback, IntPtr.Zero, MidiTimerWinApi.TIME_PERIODIC);
if (_timerId == 0)
{
var errorCode = Marshal.GetLastWin32Error();
throw new MidiDeviceException("Unable to initialize MIDI clock.", new Win32Exception(errorCode));
}
}
_stopwatch.Start();
}
/// <summary>
/// Starts a tick generator.
/// </summary>
/// <param name="interval">Interval between ticks.</param>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="interval"/> is out of
/// [<see cref="MinInterval"/>; <see cref="MaxInterval"/>] range.</exception>
protected override void Start(TimeSpan interval)
{
ThrowIfArgument.IsOutOfRange(nameof(interval),
interval,
MinInterval,
MaxInterval,
$"Interval is out of [{MinInterval}, {MaxInterval}] range.");
var intervalInMilliseconds = (uint)interval.TotalMilliseconds;
var timeCaps = default(MidiTimerWinApi.TIMECAPS);
ProcessMmResult(MidiTimerWinApi.timeGetDevCaps(ref timeCaps, (uint)Marshal.SizeOf(timeCaps)));
_resolution = Math.Min(Math.Max(timeCaps.wPeriodMin, intervalInMilliseconds), timeCaps.wPeriodMax);
_tickCallback = OnTick;
ProcessMmResult(MidiTimerWinApi.timeBeginPeriod(_resolution));
_timerId = MidiTimerWinApi.timeSetEvent(intervalInMilliseconds, _resolution, _tickCallback, IntPtr.Zero, MidiTimerWinApi.TIME_PERIODIC);
if (_timerId == NoTimerId)
{
var errorCode = Marshal.GetLastWin32Error();
throw new MidiDeviceException("Unable to start tick generator.", new Win32Exception(errorCode));
}
}
public void Start()
{
if (IsRunning)
{
return;
}
// TODO: process errors
var timeCaps = default(MidiTimerWinApi.TIMECAPS);
MidiTimerWinApi.timeGetDevCaps(ref timeCaps, (uint)Marshal.SizeOf(timeCaps));
_resolution = Math.Min(Math.Max(timeCaps.wPeriodMin, _interval), timeCaps.wPeriodMax);
_tickCallback = OnTick;
_stopwatch.Start();
MidiTimerWinApi.timeBeginPeriod(_resolution);
_timerId = MidiTimerWinApi.timeSetEvent(_interval, _resolution, _tickCallback, IntPtr.Zero, MidiTimerWinApi.TIME_PERIODIC);
IsRunning = true;
}