Fix

Technosoftware/DaAeHdaClient/Utilities/HiResClock.cs

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+#region Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
+//-----------------------------------------------------------------------------
+// Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
+// Web: https://www.technosoftware.com 
+// 
+// The source code in this file is covered under a dual-license scenario:
+//   - Owner of a purchased license: SCLA 1.0
+//   - GPL V3: everybody else
+//
+// SCLA license terms accompanied with this source code.
+// See SCLA 1.0: https://technosoftware.com/license/Source_Code_License_Agreement.pdf
+//
+// GNU General Public License as published by the Free Software Foundation;
+// version 3 of the License are accompanied with this source code.
+// See https://technosoftware.com/license/GPLv3License.txt
+//
+// This source code is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.
+//-----------------------------------------------------------------------------
+#endregion Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
+
+#region Using Directives
+using System;
+using System.Runtime.InteropServices;
+#endregion
+
+namespace Technosoftware.DaAeHdaClient.Utilities
+{
+    /// <summary>
+    /// Produces high resolution timestamps.
+    /// </summary>
+    internal class HiResClock
+    {
+        /// <summary>
+        /// Returns the current UTC time (bugs in HALs on some computers can result in time jumping backwards).
+        /// </summary>
+        public static DateTime UtcNow
+        {
+            get
+            {
+                if (s_Default.m_disabled)
+                {
+                    return DateTime.UtcNow;
+                }
+
+                long counter;
+                if (NativeMethods.QueryPerformanceCounter(out counter) == 0)
+                {
+                    return DateTime.UtcNow;
+                }
+
+                var ticks = (counter - s_Default.m_baseline)*s_Default.m_ratio;
+
+                return new DateTime((long)ticks + s_Default.m_offset);
+            }
+        }
+
+        /// <summary>
+        /// Disables the hi-res clock (may be necessary on some machines with bugs in the HAL).
+        /// </summary>
+        public static bool Disabled
+        {
+            get => s_Default.m_disabled;
+
+            set => s_Default.m_disabled = value;
+        }
+
+        /// <summary>
+        /// Constructs a class.
+        /// </summary>
+        private HiResClock()
+        {
+            if (NativeMethods.QueryPerformanceFrequency(out m_frequency) == 0)
+            {
+                m_frequency = TimeSpan.TicksPerSecond;
+            }
+
+            m_offset = DateTime.UtcNow.Ticks;
+
+            if (NativeMethods.QueryPerformanceCounter(out m_baseline) == 0)
+            {
+                m_baseline = m_offset;
+            }
+
+            m_ratio = ((decimal)TimeSpan.TicksPerSecond)/m_frequency;
+        }
+
+        /// <summary>
+        /// Defines a global instance.
+        /// </summary>
+        private static readonly HiResClock s_Default = new HiResClock();
+
+        /// <summary>
+        /// Defines the native methods used by the class.
+        /// </summary>
+        private static class NativeMethods
+        {
+            [DllImport("Kernel32.dll")]
+            public static extern int QueryPerformanceFrequency(out long lpFrequency);
+
+            [DllImport("Kernel32.dll")]
+            public static extern int QueryPerformanceCounter(out long lpFrequency);
+        }
+
+        private long m_frequency;
+        private long m_baseline;
+        private long m_offset;
+        private decimal m_ratio;
+        private bool m_disabled;
+    }
+
+}