127 lines
4.4 KiB
C#
127 lines
4.4 KiB
C#
using DirectShowLib;
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using System;
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using System.Runtime.InteropServices;
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namespace DualScreenDemo.Services
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{
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public class MediaServicePrimary : Video
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{
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IGraphBuilder graphBuilder;
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IBaseFilter lavSplitter;
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IBaseFilter lavVideoDecoder;
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IBaseFilter videoRenderer;
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IVideoWindow videoWindow;
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IMediaControl mediaControl;
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IBaseFilter sourceFilter;
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public MediaServicePrimary() { }
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public int Run()
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{
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if (mediaControl != null)
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return mediaControl.Run();
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else
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return 0;
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}
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public int Stop()
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{
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if (mediaControl != null)
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return mediaControl.Stop();
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else
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return 0;
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}
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public int Pause()
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{
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if (mediaControl != null)
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return mediaControl.Pause();
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else
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return 0;
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}
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public void VideoPlayerFormClosing()
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{
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if (videoWindow != null)
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{
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videoWindow.put_Visible(OABool.False);
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videoWindow.put_Owner(IntPtr.Zero);
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Marshal.ReleaseComObject(videoWindow);
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videoWindow = null;
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}
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}
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public void StopAndReleaseResources()
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{
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if (mediaControl != null)
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{
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mediaControl.Stop();
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SafeRelease(ref mediaControl);
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}
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SafeRelease(ref videoWindow);
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SafeRelease(ref videoRenderer);
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SafeRelease(ref sourceFilter);
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SafeRelease(ref lavVideoDecoder);
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SafeRelease(ref lavSplitter);
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SafeRelease(ref graphBuilder);
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}
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public void RenderMediaFile(string filePath, nint Handle, int Width, int Height)
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{
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StopAndReleaseResources();
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if (videoWindow != null) videoWindow.put_Visible(OABool.False);
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int hr;
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graphBuilder = (IGraphBuilder)new FilterGraph();
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if (graphBuilder == null)
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throw new Exception("Failed to create FilterGraph for primary monitor.");
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graphBuilder.AddSourceFilter(filePath, "Source", out sourceFilter);
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try
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{
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lavSplitter = AddFilterByClsid(graphBuilder, "LAV Splitter", Clsid.LAVSplitter);
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lavVideoDecoder = AddFilterByClsid(graphBuilder, "LAV Video Decoder", Clsid.LAVVideoDecoder);
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videoRenderer = AddFilterByClsid(graphBuilder, "Primary Video Renderer", Clsid.VideoRenderer);
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hr = graphBuilder.AddFilter(videoRenderer, "Primary Video Renderer");
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DsError.ThrowExceptionForHR(hr);
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mediaControl = (IMediaControl)graphBuilder;
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if (mediaControl == null)
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{
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Console.WriteLine("Failed to get Media Control for primary monitor.");
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return;
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}
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hr = ConnectFilters(graphBuilder, sourceFilter, "Output", lavSplitter, "Input");
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DsError.ThrowExceptionForHR(hr);
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hr = ConnectFilters(graphBuilder, lavSplitter, "Video", lavVideoDecoder, "Input");
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DsError.ThrowExceptionForHR(hr);
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hr = ConnectFilters(graphBuilder, lavVideoDecoder, "Output", videoRenderer, "VMR Input0");
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DsError.ThrowExceptionForHR(hr);
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try
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{
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IVideoWindow videoWindow = (IVideoWindow)videoRenderer;
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videoWindow.put_Owner(Handle);
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videoWindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren);
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// ⬅ 左上角對齊（固定從 0,0 開始）
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videoWindow.SetWindowPosition(0, 0, Width, Height);
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videoWindow.put_Visible(OABool.True);
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// Console.WriteLine("Video window configured successfully.");
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}
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catch (Exception ex)
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{
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Console.WriteLine(String.Format("Error syncing to primary monitor: {0}", ex.Message));
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MessageBox.Show(String.Format("Error syncing to primary monitor: {0}", ex.Message));
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine("Error initializing graph builder for primary monitor: " + ex.Message);
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}
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}
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}
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} |