xamarin 获取摄像头byte array

Former-commit-id: 18e5a420aaeb5694df7968156397d52ad8eec826

projects/Demo/Demo.iOS/AppDelegate.cs

@@ -13,9 +13,9 @@ namespace Demo.iOS
             this.Notification();
             LibVLCSharpFormsRenderer.Init();
             ZXing.Net.Mobile.Forms.iOS.Platform.Init();
-            CameraPreview.iOS.CameraPreviewSettings.Instance.Init(new IosDecoder());
             global::Xamarin.Forms.Forms.Init();
             LoadApplication(new App());
+            CameraPreview.iOS.CameraPreviewSettings.Instance.Init(new IosDecoder());
             return base.FinishedLaunching(app, options);
         }
 

projects/Demo/Demo.iOS/Demo.iOS.csproj

@@ -59,6 +59,7 @@
     <CodesignExtraArgs />
     <CodesignResourceRules />
     <MtouchEnableSGenConc>false</MtouchEnableSGenConc>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
     <DebugType>none</DebugType>
@@ -162,10 +163,6 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="System" />
-    <Reference Include="System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Drawing.dll</HintPath>
-    </Reference>
     <Reference Include="System.Web.Services" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Core" />

projects/Demo/Demo.iOS/IosDecoder.cs

@@ -1,10 +1,9 @@
 using CameraPreview;
 using CameraPreview.iOS;
+using CoreGraphics;
 using CoreVideo;
-using System.Drawing;
-using System.Drawing.Imaging;
 using System.IO;
-using ZXing.Mobile;
+using UIKit;
 
 namespace Demo.iOS
 {
@@ -14,47 +13,31 @@ namespace Demo.iOS
 
         public override IScanResult Decode(CVPixelBuffer pixelBuffer)
         {
-            unsafe
+            pixelBuffer.Lock(CVPixelBufferLock.None);
+            var flags = CGBitmapFlags.PremultipliedFirst | CGBitmapFlags.ByteOrder32Little;
+            using (var cs = CGColorSpace.CreateDeviceRGB())
             {
-                var rawData = (byte*)pixelBuffer.BaseAddress.ToPointer();
-                int rawDatalen = (int)(pixelBuffer.Height * pixelBuffer.Width * 4);
-                int width = (int)pixelBuffer.Width;
-                int height = (int)pixelBuffer.Height;
-                var luminanceSource = new CVPixelBufferBGRA32LuminanceSource(rawData, rawDatalen, width, height);
-                using (Bitmap image = new Bitmap(luminanceSource.Width, luminanceSource.Height))
+                using (var context = new CGBitmapContext(pixelBuffer.BaseAddress,
+                    pixelBuffer.Width,
+                    pixelBuffer.Height,
+                    8,
+                    pixelBuffer.BytesPerRow,
+                    cs,
+                    (CGImageAlphaInfo)flags))
                 {
-                    for (int r = 0; r < height; r++)
+                    using (var cgImage = context.ToImage())
                     {
-                        for (int c = 0; c < width; c++)
+                        pixelBuffer.Unlock(CVPixelBufferLock.None);
+                        var uiImage = UIImage.FromImage(cgImage);
+                        using (var stream = new MemoryStream())
                         {
-                            var value = luminanceSource.Matrix[r * width + c];
-                            image.SetPixel(c, r, Color.FromArgb(value, value, value));
+                            uiImage.AsJPEG().AsStream().CopyTo(stream);
+                            this._faceDecoder.Decode(stream.ToArray());
                         }
                     }
-                    using (var stream = new MemoryStream())
-                    {
-                        var @params = new EncoderParameters(1);
-                        @params.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
-                        image.Save(stream, GetEncoderInfo("image/jpeg"), @params);
-                        this._faceDecoder.Decode(stream.ToArray());
-                    }
-                    this._faceDecoder.Decode(luminanceSource.Matrix);
                 }
             }
             return base.Decode(pixelBuffer);
         }
-
-        private static ImageCodecInfo GetEncoderInfo(string mimeType)
-        {
-            int j;
-            ImageCodecInfo[] encoders;
-            encoders = ImageCodecInfo.GetImageEncoders();
-            for (j = 0; j < encoders.Length; ++j)
-            {
-                if (encoders[j].MimeType == mimeType)
-                    return encoders[j];
-            }
-            return null;
-        }
     }
 }

projects/Demo/Demo/FaceDecoder.cs

@@ -6,7 +6,6 @@ namespace Demo
     {
         public void Decode(byte[] image)
         {
-            //Console.WriteLine(BitConverter.ToString(image).Replace("-", ""));
             var base64 = Convert.ToBase64String(image);
             //Console.WriteLine();
         }