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1. modify some code 2. add extenstion method for wpf preview
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| using DirectN; | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Runtime.InteropServices; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
| using System.Windows.Media; | ||
| using System.Windows.Media.Imaging; | ||
|
|
||
| namespace QSoft.MediaCapture.WPF | ||
| { | ||
| public static class WebCam_MF_Extension | ||
| { | ||
| public static async Task<HRESULT> StartPreview(this QSoft.MediaCapture.WebCam_MF src, Action<WriteableBitmap> action) | ||
| { | ||
| src.GetPreviewSize(out var width, out var height); | ||
| WriteableBitmap bmp = new WriteableBitmap(width, height,96,96, PixelFormats.Bgr24, null); | ||
| var hr = await src.StartPreview(new MFCaptureEngineOnSampleCallback(bmp)); | ||
| action?.Invoke(bmp); | ||
| return hr; | ||
| } | ||
| } | ||
|
|
||
| public partial class MFCaptureEngineOnSampleCallback : IMFCaptureEngineOnSampleCallback | ||
| { | ||
| #if NET8_0_OR_GREATER | ||
| [LibraryImport("kernel32.dll", EntryPoint = "RtlCopyMemory", SetLastError = false)] | ||
| internal static partial void CopyMemory(IntPtr dest, IntPtr src, uint count); | ||
|
|
||
| #else | ||
| [DllImport("kernel32.dll", EntryPoint = "CopyMemory", SetLastError = false)] | ||
| internal static extern void CopyMemory(IntPtr dest, IntPtr src, uint count); | ||
| #endif | ||
|
|
||
| WriteableBitmap? m_Bmp; | ||
| public MFCaptureEngineOnSampleCallback(WriteableBitmap data) | ||
| { | ||
| this.m_Bmp = data; | ||
| } | ||
| int samplecount = 0; | ||
| object m_Lock = new object(); | ||
| System.Diagnostics.Stopwatch? m_StopWatch; | ||
| public HRESULT OnSample(IMFSample pSample) | ||
| { | ||
| if (System.Threading.Monitor.TryEnter(this.m_Lock)) | ||
| { | ||
| if (samplecount == 0) | ||
| { | ||
| m_StopWatch = System.Diagnostics.Stopwatch.StartNew(); | ||
| } | ||
| samplecount++; | ||
| if (samplecount > 100 && m_StopWatch != null) | ||
| { | ||
| m_StopWatch.Stop(); | ||
| var fps = samplecount / m_StopWatch.Elapsed.TotalSeconds; | ||
| System.Diagnostics.Trace.WriteLine($"fps:{fps}"); | ||
| samplecount = 0; | ||
| } | ||
| pSample.GetBufferByIndex(0, out var buf); | ||
| var ptr = buf.Lock(out var max, out var cur); | ||
|
|
||
| m_Bmp?.Dispatcher.Invoke(() => | ||
| { | ||
| m_Bmp.Lock(); | ||
| CopyMemory(m_Bmp.BackBuffer, ptr, cur); | ||
| m_Bmp.AddDirtyRect(new System.Windows.Int32Rect(0, 0, m_Bmp.PixelWidth, m_Bmp.PixelHeight)); | ||
| m_Bmp.Unlock(); | ||
| }, System.Windows.Threading.DispatcherPriority.Background); | ||
|
|
||
| buf.Unlock(); | ||
| Marshal.ReleaseComObject(buf); | ||
| Marshal.ReleaseComObject(pSample); | ||
| System.Threading.Monitor.Exit(this.m_Lock); | ||
| } | ||
| else | ||
| { | ||
| Marshal.ReleaseComObject(pSample); | ||
| } | ||
|
|
||
| return HRESULTS.S_OK; | ||
| } | ||
| } | ||
| } |
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