public unsafe void Start()
{
lock (stateLock)
{
if (!Enabled)
{
if (IsSupportedNatively(Interval))
{
var caps = new TimeCaps();
_ = timeGetDevCaps(ref caps, (uint)sizeof(TimeCaps));
var clampedInterval = Math.Clamp((uint)Interval, caps.wPeriodMin, caps.wPeriodMax);
_ = timeBeginPeriod(clampedInterval);
timerId = timeSetEvent(clampedInterval, 1, callbackDelegate, IntPtr.Zero, EventType.TIME_PERIODIC | EventType.TIME_KILL_SYNCHRONOUS);
Enabled = true;
}
else
{
Log.Write("Timer", "Unsupported interval detected, will use fallback timer. Expect high CPU usage", LogLevel.Warning);
fallbackTimer = new FallbackTimer
{
Interval = Interval
};
fallbackTimer.Elapsed += () => Elapsed?.Invoke();
fallbackTimer.Start();
Enabled = true;
}
}
}
}
private void GetCapabilities(out uint minimum, out uint maximum)
{
TimeCaps timeCaps = new TimeCaps(0, 0);
uint result = timeGetDevCaps(out timeCaps, Marshal.SizeOf(timeCaps));
minimum = timeCaps.minimum;
maximum = timeCaps.maximum;
}
static Session()
{
TimeCaps timeCaps = new TimeCaps();
NativeMethods.timeGetDevCaps(ref timeCaps, (uint)Marshal.SizeOf(timeCaps));
periodMax = timeCaps.wPeriodMax;
periodMin = timeCaps.wPeriodMin;
}
uint GetMinimumTimerResolution()
{
var timeCaps = new TimeCaps();
var devCaps = InternalNativeMethods.timeGetDevCaps(timeCaps: ref timeCaps, sizeTimeCaps: (uint)Marshal.SizeOf(structure: timeCaps));
if (devCaps != 0U)
{
throw new Exception(message: string.Format(format: "P/Invoke of timeGetDevCaps returned error {0}", arg0: devCaps));
}
return(timeCaps.periodMin);
}
public unsafe void Start()
{
lock (stateLock)
{
var caps = new TimeCaps();
timeGetDevCaps(ref caps, (uint)sizeof(TimeCaps));
timeBeginPeriod(Math.Clamp((uint)Interval, caps.wPeriodMin, caps.wPeriodMax));
Enabled = true;
timerId = timeSetEvent(1, 1, callbackDelegate, IntPtr.Zero, EventType.TIME_PERIODIC);
}
}
public static void TimeGetDevCaps(out int minPeriod, out int maxPeriod)
{
TimeCaps tc = new TimeCaps();
uint rslt = timeGetDevCaps(ref tc, (uint)TimeCaps.Size);
if (rslt != 0)
{
throw new Win32Exception();
}
minPeriod = (int)tc.wPeriodMin;
maxPeriod = (int)tc.wPeriodMax;
}
public MMWaitableTimer(uint period)
{
TimeCaps caps = new TimeCaps();
uint res = timeGetDevCaps(ref caps, (uint)Marshal.SizeOf(typeof(TimeCaps)));
if (res == 0) {
timeBeginPeriod(caps.wPeriodMin);
}
else {
Console.WriteLine("could not get timing resolution");
}
ev = new AutoResetEvent(false);
eventID = timeSetEvent(period, 0, ev.SafeWaitHandle.DangerousGetHandle(), IntPtr.Zero, TIME_CALLBACK_EVENT_SET | TIME_PERIODIC);
}
/// <summary>
/// Constructor.
/// </summary>
public HighPrecisionEventTimer()
{
// Establish the timing intervals capabilities - not needed right now but nice to have.
TimeCaps timeCaps = new TimeCaps(0, 0);
// This function queries the timer device to determine its resolution.
if (timeGetDevCaps(out timeCaps, Marshal.SizeOf(timeCaps)) != 0)
{
throw new Exception("HighPrecisionEventTimer failed to aquire parameters from the OS.");
}
_minimumValue = timeCaps.Minimum;
_maximumValue = timeCaps.Maximum;
_internalAntiGCDelegateInstance = new TimerEventHandler(TickEventHandlerMethod);
}
const int TIME_KILL_SYNCHRONOUS = 0x0100; // This flag prevents the event from occurring.
/// <summary>
/// Constructor.
/// </summary>
public HighPrecisionEventTimer()
{
// Establish the timing intervals capabilities - not needed right now but nice to have.
TimeCaps timeCaps = new TimeCaps(0, 0);
// This function queries the timer device to determine its resolution.
if (timeGetDevCaps(out timeCaps, Marshal.SizeOf(timeCaps)) != 0)
{
throw new Exception("HighPrecisionEventTimer failed to aquire parameters from the OS.");
}
_minimumValue = timeCaps.Minimum;
_maximumValue = timeCaps.Maximum;
_internalAntiGCDelegateInstance = new TimerEventHandler(TickEventHandlerMethod);
}
public static void Win32OptimizedStopwatch()
{
caps = new TimeCaps();
if (TimeGetDevCaps(ref caps, (uint)System.Runtime.InteropServices.Marshal.SizeOf(caps)) != 0)
{
Console.WriteLine("StopWatch: TimeGetDevCaps failed");
}
if (TimeBeginPeriod(caps.wPeriodMin) != 0)
{
Console.WriteLine("StopWatch: TimeBeginPeriod failed");
}
}
private static extern uint timeGetDevCaps(out TimeCaps timeCaps, int size);
static extern UInt32 timeGetDevCaps(ref TimeCaps timeCaps,
UInt32 sizeTimeCaps);
private void AdjustMediaTimer(uint ms)
{
#region
//Это нужно только для того, чтоб Thread.Sleep(1) не длилось ~15ms (с дефолтными настройками).
//Thread.Sleep(1) же нужны для того, чтоб во время "выжидания" временных интервалов не грузился CPU.
//При DirectShow-превью интервал всегда задаётся в 1ms (при загрузке превью происходит установка, а
//при выгрузке - сброс, тут же это будет только перед Play и при остановке). На Stopwatch() оно не влияет.
//DSS2 и bassAudioSource тоже устанавливают интервал в 1ms.
#endregion
try
{
if (_period == 0 && ms > 0)
{
TimeCaps tcaps = new TimeCaps();
if (timeGetDevCaps(ref tcaps, (uint)Marshal.SizeOf(typeof(TimeCaps))) == 0)
{
uint period = Math.Max(tcaps.wPeriodMin, ms);
if (timeBeginPeriod(period) == 0)
_period = period;
}
}
else if (_period > 0 && ms == 0)
{
timeEndPeriod(_period);
_period = 0;
}
}
catch (Exception ex)
{
SetError(ex);
}
}
public static extern uint timeGetDevCaps([In, Out] ref TimeCaps timeCaps, [In] uint sizeTimeCaps);
internal static extern MMRESULT TimeGetDevCaps(ref TimeCaps timeCaps, uint sizeTimeCaps);
public static extern uint TimeGetDevCaps(ref TimeCaps timeCaps, uint sizeTimeCaps);
public static void OptimizedMode()
{
caps = new TimeCaps();
if (TimeGetDevCaps(ref caps, (uint)System.Runtime.InteropServices.Marshal.SizeOf(caps)) != 0)
{
Debug.ThrowError("StopWatch", "TimeGetDevCaps failed");
}
if (TimeBeginPeriod(caps.wPeriodMin) != 0)
{
Debug.ThrowError("StopWatch", "TimeBeginPeriod failed");
}
}
private static extern uint timeGetDevCaps(ref TimeCaps timeCaps, uint sizeTimeCaps);
