Add Android Camera To Unity Plugin

webrtc/examples/unityplugin/java/src/org/webrtc/UnityUtility.java

+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+import android.content.Context;
+import java.util.List;
+
+public class UnityUtility {
+  private static final String VIDEO_CAPTURER_THREAD_NAME = "VideoCapturerThread";
+
+  public static SurfaceTextureHelper LoadSurfaceTextureHelper() {
+    final SurfaceTextureHelper surfaceTextureHelper =
+        SurfaceTextureHelper.create(VIDEO_CAPTURER_THREAD_NAME, null);
+    return surfaceTextureHelper;
+  }
+
+  private static boolean useCamera2() {
+    return Camera2Enumerator.isSupported(ContextUtils.getApplicationContext());
+  }
+
+  private static VideoCapturer createCameraCapturer(CameraEnumerator enumerator) {
+    final String[] deviceNames = enumerator.getDeviceNames();
+
+    for (String deviceName : deviceNames) {
+      if (enumerator.isFrontFacing(deviceName)) {
+        VideoCapturer videoCapturer = enumerator.createCapturer(deviceName, null);
+
+        if (videoCapturer != null) {
+          return videoCapturer;
+        }
+      }
+    }
+
+    return null;
+  }
+
+  public static VideoCapturer LinkCamera(
+      long nativeTrackSource, SurfaceTextureHelper surfaceTextureHelper) {
+    VideoCapturer capturer =
+        createCameraCapturer(new Camera2Enumerator(ContextUtils.getApplicationContext()));
+
+    VideoCapturer.CapturerObserver capturerObserver =
+        new AndroidVideoTrackSourceObserver(nativeTrackSource);
+
+    capturer.initialize(
+        surfaceTextureHelper, ContextUtils.getApplicationContext(), capturerObserver);
+
+    capturer.startCapture(720, 480, 30);
+    return capturer;
+  }
+
+  public static void StopCamera(VideoCapturer camera) throws InterruptedException {
+    camera.stopCapture();
+    camera.dispose();
+  }
+}