393 lines
13 KiB
C#
393 lines
13 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using System.Threading;
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using System.Threading.Tasks;
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using Windows.Media.Control;
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namespace TimerApp
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{
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public static class NativeMethods
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{
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[StructLayout(LayoutKind.Sequential)]
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struct LASTINPUTINFO
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{
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public static readonly int SizeOf = Marshal.SizeOf(typeof(LASTINPUTINFO));
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[MarshalAs(UnmanagedType.U4)]
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public UInt32 cbSize;
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[MarshalAs(UnmanagedType.U4)]
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public UInt32 dwTime;
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}
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[DllImport("user32.dll")]
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static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);
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[DllImport("kernel32.dll")]
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static extern uint GetTickCount();
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/// <summary>
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/// 获取系统空闲时间（毫秒）
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/// </summary>
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/// <returns></returns>
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public static long GetIdleTime()
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{
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LASTINPUTINFO lastInputInfo = new LASTINPUTINFO
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{
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cbSize = (uint)Marshal.SizeOf<LASTINPUTINFO>(),
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dwTime = 0
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};
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if (GetLastInputInfo(ref lastInputInfo))
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{
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uint tickCount = GetTickCount();
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uint idleMs = unchecked(tickCount - lastInputInfo.dwTime);
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return idleMs;
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}
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return 0;
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}
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// ==========================================
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// Media Detection Logic (Refactored)
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// ==========================================
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private static volatile bool _isMediaPlayingCaught;
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private static Thread? _mediaMonitorThread;
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private static readonly CancellationTokenSource _cts = new CancellationTokenSource();
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private static readonly AutoResetEvent _checkSignal = new AutoResetEvent(false);
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static NativeMethods()
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{
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// 在静态构造函数中启动后台监控线程
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StartMediaMonitor();
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}
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/// <summary>
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/// 检测是否有媒体正在播放（视频或音频）
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/// 直接返回缓存的状态，无阻塞
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/// </summary>
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public static bool IsMediaPlaying()
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{
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return _isMediaPlayingCaught;
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}
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/// <summary>
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/// 强制立即进行一次检测
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/// </summary>
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public static void InvalidateMediaCache()
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{
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// 唤醒后台线程立即检测
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_checkSignal.Set();
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}
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/// <summary>
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/// 应用退出时清理资源 (可选调用)
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/// </summary>
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public static void Shutdown()
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{
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_cts.Cancel();
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_checkSignal.Set(); // Wake up to exit
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}
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private static void StartMediaMonitor()
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{
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if (_mediaMonitorThread != null) return;
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_mediaMonitorThread = new Thread(MediaMonitorLoop)
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{
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IsBackground = true,
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Name = "TimerApp_MediaMonitor",
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Priority = ThreadPriority.BelowNormal
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};
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_mediaMonitorThread.SetApartmentState(ApartmentState.STA); // COM requirement
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_mediaMonitorThread.Start();
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}
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private static void MediaMonitorLoop()
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{
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while (!_cts.IsCancellationRequested)
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{
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try
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{
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bool isPlaying = false;
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// 1. Check System Media Transport Controls (WinRT)
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// 需要在 STA 线程中小心处理 Task
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try
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{
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// 使用 Task.Run 确保在一个干净的上下文执行异步任务，然后同步等待结果
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// 注意：因为我们本身就在 STA 线程，直接 .Result 可能会有风险，
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// 但对于 GSMTC API，只要没有 SynchronizationContext 绑定到此线程通常是安全的。
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// 这里为了稳妥，我们捕获任何异常。
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isPlaying = CheckSystemMediaTransportControls();
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}
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catch
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{
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// Ignored
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}
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// 2. Check Legacy Audio Session API (COM)
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if (!isPlaying)
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{
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try
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{
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isPlaying = TryIsAudioPlaying();
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}
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catch
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{
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// Ignored
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}
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}
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// Update volatile cache
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_isMediaPlayingCaught = isPlaying;
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// Wait for next check (default 1s, or wake up immediately on Invalidate)
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_checkSignal.WaitOne(1000);
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}
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catch
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{
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// Prevent thread crash
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Thread.Sleep(1000);
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}
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}
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}
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private static bool CheckSystemMediaTransportControls()
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{
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// 同步等待异步方法，因为我们在专用线程上，且没有 UI SyncContext，这是安全的
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return CheckSystemMediaTransportControlsAsync().GetAwaiter().GetResult();
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}
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private static async Task<bool> CheckSystemMediaTransportControlsAsync()
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{
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try
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{
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// RequestAsync 可能在某些系统上较慢
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var manager = await GlobalSystemMediaTransportControlsSessionManager.RequestAsync();
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var current = manager.GetCurrentSession();
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if (IsPlaying(current)) return true;
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foreach (var session in manager.GetSessions())
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{
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if (IsPlaying(session)) return true;
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}
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return false;
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}
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catch
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{
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return false;
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}
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}
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private static bool IsPlaying(GlobalSystemMediaTransportControlsSession? session)
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{
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if (session == null) return false;
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try
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{
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var info = session.GetPlaybackInfo();
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return info != null && info.PlaybackStatus == GlobalSystemMediaTransportControlsSessionPlaybackStatus.Playing;
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}
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catch
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{
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return false;
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}
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}
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// ==========================================
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// COM Audio Detection
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// ==========================================
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private static bool TryIsAudioPlaying()
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{
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return TryIsAudioPlaying(ERole.eMultimedia) ||
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TryIsAudioPlaying(ERole.eConsole) ||
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TryIsAudioPlaying(ERole.eCommunications);
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}
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private static bool TryIsAudioPlaying(ERole role)
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{
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object? deviceEnumeratorObj = null;
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IMMDeviceEnumerator? deviceEnumerator = null;
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IMMDevice? device = null;
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object? sessionManagerObj = null;
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IAudioSessionManager2? sessionManager = null;
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IAudioSessionEnumerator? sessionEnumerator = null;
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try
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{
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Type? enumeratorType = Type.GetTypeFromCLSID(CLSID_MMDeviceEnumerator);
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if (enumeratorType is null) return false;
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deviceEnumeratorObj = Activator.CreateInstance(enumeratorType);
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if (deviceEnumeratorObj is null) return false;
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deviceEnumerator = (IMMDeviceEnumerator)deviceEnumeratorObj;
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// GetDefaultAudioEndpoint can fail if no audio device is present
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int hr = deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, role, out device);
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if (hr != 0) return false; // S_OK = 0
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Guid iid = typeof(IAudioSessionManager2).GUID;
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hr = device.Activate(ref iid, CLSCTX.CLSCTX_ALL, IntPtr.Zero, out sessionManagerObj);
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if (hr != 0 || sessionManagerObj is null) return false;
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sessionManager = (IAudioSessionManager2)sessionManagerObj;
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hr = sessionManager.GetSessionEnumerator(out sessionEnumerator);
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if (hr != 0) return false;
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hr = sessionEnumerator.GetCount(out int count);
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if (hr != 0) return false;
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for (int i = 0; i < count; i++)
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{
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IAudioSessionControl? sessionControl = null;
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try
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{
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hr = sessionEnumerator.GetSession(i, out sessionControl);
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if (hr != 0 || sessionControl is null) continue;
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hr = sessionControl.GetState(out AudioSessionState state);
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if (hr != 0) continue;
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if (state == AudioSessionState.Active)
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{
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if (sessionControl is IAudioMeterInformation meter)
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{
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hr = meter.GetPeakValue(out float peak);
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if (hr == 0 && peak > 0.000001f) // Slightly relaxed threshold
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return true;
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}
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else
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{
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// Cannot check peak, assume active means playing
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return true;
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}
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}
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}
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finally
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{
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if (sessionControl != null) Marshal.FinalReleaseComObject(sessionControl);
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}
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}
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return false;
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}
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catch
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{
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return false;
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}
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finally
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{
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if (sessionEnumerator != null) Marshal.FinalReleaseComObject(sessionEnumerator);
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if (sessionManager != null) Marshal.FinalReleaseComObject(sessionManager); // Corrected variable usage
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if (sessionManagerObj != null) Marshal.FinalReleaseComObject(sessionManagerObj);
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if (device != null) Marshal.FinalReleaseComObject(device);
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if (deviceEnumeratorObj != null) Marshal.FinalReleaseComObject(deviceEnumeratorObj);
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}
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}
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private static readonly Guid CLSID_MMDeviceEnumerator = new Guid("BCDE0395-E52F-467C-8E3D-C4579291692E");
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private enum EDataFlow
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{
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eRender = 0,
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eCapture = 1,
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eAll = 2
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}
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private enum ERole
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{
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eConsole = 0,
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eMultimedia = 1,
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eCommunications = 2
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}
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private enum AudioSessionState
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{
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Inactive = 0,
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Active = 1,
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Expired = 2
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}
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[Flags]
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private enum CLSCTX : uint
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{
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CLSCTX_INPROC_SERVER = 0x1,
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CLSCTX_INPROC_HANDLER = 0x2,
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CLSCTX_LOCAL_SERVER = 0x4,
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CLSCTX_REMOTE_SERVER = 0x10,
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CLSCTX_ALL = CLSCTX_INPROC_SERVER | CLSCTX_INPROC_HANDLER | CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER
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}
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[ComImport]
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[Guid("A95664D2-9614-4F35-A746-DE8DB63617E6")]
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[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IMMDeviceEnumerator
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{
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int NotImpl1();
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[PreserveSig]
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int GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role, out IMMDevice ppDevice);
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}
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[ComImport]
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[Guid("D666063F-1587-4E43-81F1-B948E807363F")]
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[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IMMDevice
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{
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[PreserveSig]
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int Activate(ref Guid iid, CLSCTX dwClsCtx, IntPtr pActivationParams, [MarshalAs(UnmanagedType.IUnknown)] out object ppInterface);
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}
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[ComImport]
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[Guid("77AA99A0-1BD6-484F-8BC7-2C654C9A9B6F")]
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[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IAudioSessionManager2
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{
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int NotImpl1();
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int NotImpl2();
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[PreserveSig]
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int GetSessionEnumerator(out IAudioSessionEnumerator sessionEnum);
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}
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[ComImport]
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[Guid("E2F5BB11-0570-40CA-ACDD-3AA01277DEE8")]
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[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IAudioSessionEnumerator
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{
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[PreserveSig]
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int GetCount(out int sessionCount);
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[PreserveSig]
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int GetSession(int sessionCount, out IAudioSessionControl session);
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}
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[ComImport]
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[Guid("F4B1A599-7266-4319-A8CA-E70ACB11E8CD")]
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[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IAudioSessionControl
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{
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[PreserveSig]
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int GetState(out AudioSessionState state);
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int NotImpl1();
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int NotImpl2();
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int NotImpl3();
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int NotImpl4();
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int NotImpl5();
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int NotImpl6();
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int NotImpl7();
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int NotImpl8();
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}
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[ComImport]
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[Guid("C02216F6-8C67-4B5B-9D00-D008E73E0064")]
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[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IAudioMeterInformation
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{
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[PreserveSig]
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int GetPeakValue(out float peak);
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}
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}
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}
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