在无头Chrome中录制视频UI自动测试

...
var timeTillNextFrame = TimeSpan.Zero;
while (!_stopThread.WaitOne(timeTillNextFrame))
{
    var screenShotDriver = Driver as ITakesScreenshot;
    if (screenShotDriver == null)
    {
        continue;
    }

    var screenShot = screenShotDriver.GetScreenshot();
    ...
}

var options = new ConnectOptions()
{
    BrowserURL = $"http://127.0.0.1:{debugPort}"
};

_puppeteerBrowser = Puppeteer.ConnectAsync(options).GetAwaiter().GetResult();

...
var timeTillNextFrame = TimeSpan.Zero;
while (!_stopThread.WaitOne(timeTillNextFrame))
{
    var pages = _puppeteerBrowser.PagesAsync().GetAwaiter().GetResult();
    if (pages.Length <= 0)
    {
        continue;
    }
    
    var page = pages[0];
    
    page.SetViewportAsync(new ViewPortOptions
    {
        Width = screenWidth,
        Height = screenHeight
    }).GetAwaiter().GetResult();
    
    var screen = page.ScreenshotStreamAsync().GetAwaiter().GetResult();
    ...
}

package main

import (
    "os"
    "context"
    "fmt"
    "io/ioutil"
    "log"
    "time"
    "flag"

    "github.com/mafredri/cdp"
    "github.com/mafredri/cdp/devtool"
    "github.com/mafredri/cdp/protocol/page"
    "github.com/mafredri/cdp/rpcc"
)

func main() {

    folderPtr := flag.String("folder", "", "folder path for screenshots: example c:\\temp\\screens\\")
    chromePtr := flag.String("chrome", "http://localhost:9222", "chrome connection - example: http://localhost:9222")
    
    widthPtr := flag.Int("width", 1280, "screencast width")
    heightPtr := flag.Int("height", 720, "screencast height")
    qualityPtr := flag.Int("quality", 100, "screencast quality")
    
    flag.Parse()

    if err := run(*folderPtr, *chromePtr, *widthPtr, *heightPtr, *qualityPtr); err != nil {
        panic(err)
    }
}

func run(folder string, chromeConnection string, width int, height int, quality int) error {
    ctx, cancel := context.WithCancel(context.TODO())
    defer cancel()
    
    chromePath := chromeConnection
    folderPath := folder

    devt := devtool.New(chromePath)

    pageTarget, err := devt.Get(ctx, devtool.Page)
    if err != nil {
        return err
    }

    conn, err := rpcc.DialContext(ctx, pageTarget.WebSocketDebuggerURL)
    if err != nil {
        return err
    }
    defer conn.Close()

    c := cdp.NewClient(conn)

    err = c.Page.Enable(ctx)
    if err != nil {
        return err
    }

    // Start listening to ScreencastFrame events.
    screencastFrame, err := c.Page.ScreencastFrame(ctx)
    if err != nil {
        return err
    }

    go func() {
        defer screencastFrame.Close()

        for {
            ev, err := screencastFrame.Recv()
            if err != nil {
                log.Printf("Failed to receive ScreencastFrame: %v", err)
                os.Exit(0)
            }
            log.Printf("Got frame with sessionID: %d: %+v", ev.SessionID, ev.Metadata)

            err = c.Page.ScreencastFrameAck(ctx, page.NewScreencastFrameAckArgs(ev.SessionID))
            if err != nil {
                log.Printf("Failed to ack ScreencastFrame: %v", err)
                os.Exit(0)
            }

            // Write to screencast_frame-[timestamp].png.
            name := fmt.Sprintf("screencast_frame-%d.png", ev.Metadata.Timestamp.Time().Unix())
            
            filePath := folderPath + name

            // Write the frame to file (without blocking).
            go func() {
                err = ioutil.WriteFile(filePath, ev.Data, 0644)
                if err != nil {
                    log.Printf("Failed to write ScreencastFrame to %q: %v", name, err)
                }
            }()
        }
    }()

    screencastArgs := page.NewStartScreencastArgs().
        SetQuality(quality).
        SetMaxWidth(width).
        SetMaxHeight(height).
        SetEveryNthFrame(1).
        SetFormat("png")
    err = c.Page.StartScreencast(ctx, screencastArgs)
    if err != nil {
        return err
    }

    // Random delay for our screencast.
    time.Sleep(600 * time.Second)

    err = c.Page.StopScreencast(ctx)
    if err != nil {
        return err
    }

    return nil
}

var startInfo = new ProcessStartInfo(screenCastPath)
{
    WindowStyle = ProcessWindowStyle.Minimized,

    Arguments = $"-folder={_framesFolderPath} " +
                $"-chrome=http://localhost:{_debugPort} " +
                "-width=1024 " +
                "-height=576 " +
                "-quality=0"
};

Process.Start(startInfo);

private void GenerateVideoFromScreens(string videoPath)
{
    try
    {
        var videoWriter = new AviWriter(videoPath) { FramesPerSecond = 1, EmitIndex1 = true };

        var videoStream = videoWriter.AddMotionJpegVideoStream(1024, 576);

        var screens = new DirectoryInfo(_framesFolderPath).GetFiles().OrderBy(f => f.CreationTimeUtc.Ticks).ToList();
        foreach (var screen in screens)
        {
            try
            {
                using (var bmp = new Bitmap(screen.FullName))
                {
                    var bits = bmp.LockBits(new Rectangle(0, 0, videoStream.Width, videoStream.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppRgb);
                    var videoFrame = new byte[videoStream.Width * videoStream.Height * 4];
                    Marshal.Copy(bits.Scan0, videoFrame, 0, videoFrame.Length);
                    bmp.UnlockBits(bits);

                    videoStream.WriteFrameAsync(
                        true,
                        videoFrame,
                        0,
                        videoFrame.Length).GetAwaiter().GetResult();
                }
            }
            catch(Exception ex)
            {
                // ignore all video related errors per frame
            }
        }

        videoWriter.Close();
    }
    catch
    {
        // ignore all video related errors per streams
    }
}

public Bitmap ResizeImage(Bitmap bitmap, int width)
{
	using (var inStream = new MemoryStream())
	{
		bitmap.Save(inStream, ImageFormat.Png);
		inStream.Position = 0;
		using (MemoryStream outStream = new MemoryStream())
		{
			var settings = new ProcessImageSettings { Width = width };
			MagicImageProcessor.ProcessImage(inStream, outStream, settings);
			return new Bitmap(outStream);
		}
	}
}