基于C#实现的高性能实时MP4录屏方案

// 初始化捕获设备
var factory = new SharpDX.Direct3D11.DeviceFactory();
var adapter = factory.GetAdapter1(0);
var device = new SharpDX.Direct3D11.Device(adapter);

// 创建DXGI输出
var output = adapter.GetOutput(0);
var output1 = output.QueryInterface<SharpDX.DXGI.Output1>();
var duplication = output1.DuplicateOutput(device);

// 配置视频编码参数
var mediaType = new MediaFoundationEncoder.VideoMediaType(
    width: 1920,
    height: 1080,
    frameRate: 30,
    pixelFormat: SharpDX.WIC.PixelFormat.Format32bppBGRA,
    codec: MediaFoundationEncoder.Codec.H264,
    bitrate: 5000000 // 5Mbps
);

// 创建编码器
var encoder = new MediaFoundationEncoder(mediaType);
encoder.StartEncoding("output.mp4");

// 录制循环
while (isRecording)
{
    var frame = duplication.AcquireNextFrame(1000);
    var texture = frame.DesktopImage;
    
    // 转换为MediaFoundation可处理格式
    using (var stream = new MemoryStream())
    {
        texture.CopyTo(stream);
        encoder.EncodeFrame(stream.ToArray());
    }
    
    frame.Release();
}

// 自适应帧率控制
var targetFrameTime = 1000 / targetFPS;
var lastFrameTime = Stopwatch.StartNew();

while (isRecording)
{
    var frameTime = lastFrameTime.ElapsedMilliseconds;
    if (frameTime >= targetFrameTime)
    {
        // 捕获并编码帧
        lastFrameTime.Restart();
    }
    else
    {
        Thread.Sleep(targetFrameTime - (int)frameTime);
    }
}

// 自动分段保存逻辑
private void CheckSegment()
{
    if (encoder.TotalDuration >= _segmentDuration)
    {
        encoder.StopEncoding();
        string newPath = GenerateSegmentPath();
        encoder.StartEncoding(newPath);
    }
}

// 文件名生成策略
private string GenerateSegmentPath()
{
    var now = DateTime.Now;
    return $"recording_{now:yyyyMMdd_HHmmss}_{Guid.NewGuid():N}.mp4";
}

<!-- NuGet依赖 -->
<PackageReference Include="SharpDX" Version="4.3.0" />
<PackageReference Include="MediaFoundationEncoder" Version="1.2.0" />

<!-- 主窗体布局 -->
<DockPanel>
    <StatusBar DockPanel.Dock="Bottom">
        <TextBlock Text="{Binding Status}"/>
        <TextBlock Text="{Binding FPS} FPS"/>
    </StatusBar>
    
    <Button Content="开始录制" Command="{Binding StartCommand}"/>
    <Button Content="停止录制" Command="{Binding StopCommand}"/>
    
    <Slider Minimum="1" Maximum="60" Value="{Binding FrameRate}" Width="200"/>
</DockPanel>

public class MainViewModel : INotifyPropertyChanged
{
    private bool _isRecording;
    private int _frameRate = 30;
    private long _totalFrames;
    
    public ICommand StartCommand => new RelayCommand(StartRecording);
    public ICommand StopCommand => new RelayCommand(StopRecording);
    
    public string Status => _isRecording ? "录制中..." : "空闲";
    public int FPS => (int)(_totalFrames / (Stopwatch.GetTimestamp() / 1e7));
    
    private void StartRecording()
    {
        _isRecording = true;
        _totalFrames = 0;
        
        Task.Run(() => 
        {
            using (var recorder = new MediaRecorder())
            {
                recorder.Start(_frameRate);
                while (_isRecording)
                {
                    var frame = CaptureFrame();
                    recorder.Encode(frame);
                    _totalFrames++;
                }
                recorder.Stop();
            }
        });
    }
    
    private void StopRecording()
    {
        _isRecording = false;
    }
}

public class FramePool
{
    private readonly Queue<Texture2D> _pool = new();
    
    public Texture2D GetFrame(int width, int height)
    {
        return _pool.Count > 0 ? _pool.Dequeue() : new Texture2D(device, width, height);
    }
    
    public void ReturnFrame(Texture2D frame)
    {
        frame.Dispose();
    }
}

// 生产者-消费者模型
BlockingCollection<Bitmap> _frameQueue = new();
Task.Run(() => EncodeWorker());

void EncodeWorker()
{
    foreach (var frame in _frameQueue.GetConsumingEnumerable())
    {
        // 编码处理
    }
}

// 使用DX12的显存直接访问
var commandAllocator = new CommandAllocator(device, CommandListType.Copy);
var commandList = new CommandList(device, commandAllocator);
commandList.CopyBufferRegion(stagingBuffer, 0, gpuBuffer, 0, dataSize);
commandAllocator.Reset();
commandList.Reset(commandAllocator, null);

// 在捕获帧时叠加点击标记
void DrawClickMarker(Graphics g, Point position)
{
    using (var pen = new Pen(Color.Red, 2))
    {
        g.DrawEllipse(pen, position.X - 5, position.Y - 5, 10, 10);
    }
}

// 使用NAudio捕获系统音频
using (var waveIn = new WaveInEvent())
{
    waveIn.DataAvailable += (s, e) => 
    {
        audioBuffer.Write(e.Buffer, 0, e.BytesRecorded);
    };
    waveIn.StartRecording();
}

// 实时显示资源占用
public class PerformanceMonitor
{
    private readonly PerformanceCounter _cpuCounter = new("Processor", "% Processor Time", "_Total");
    private readonly PerformanceCounter _ramCounter = new("Memory", "Available MBytes");
    
    public string GetStatus()
    {
        return $"CPU: {_cpuCounter.NextValue()}%  内存: {_ramCounter.NextValue()}MB";
    }
}

public static class Logger
{
    private static readonly RollingFileAppender _appender = new();
    
    static Logger()
    {
        _appender.File = "log.txt";
        _appender.Layout = new PatternLayout("%date [%thread] %-5level %logger - %message%newline");
        _appender.ActivateOptions();
    }
    
    public static void Log(string message)
    {
        _appender.DoAppend(new LoggingEvent(new LoggingEventData {
            Message = message,
            TimeStamp = DateTime.Now
        }));
    }
}

# 使用signtool进行数字签名
signtool sign /fd SHA256 /tr http://timestamp.digicert.com /td SHA256 MyApp.exe

<!-- WiX安装配置 -->
<Component Id="MainComponent" Guid="*">
    <File Id="MainExe" Name="MyApp.exe" Source="..\bin\Release\MyApp.exe"/>
    <RegistryValue Root="HKLM" Key="Software\MyCompany\MyApp" 
                   Name="InstallDir" Value="[INSTALLDIR]" Type="string"/>
</Component>

mediaType.FFmpegOptions.Add("movflags", "faststart");