Android: Add Size class.

The Camera1 and Camera2 API use different size types. Camera1 uses
android.hardware.Camera.Size while Camera2 uses android.util.Size.
android.util.Size is only available from Lollipop forward so this CL
adds a similar Size class in CaptureFormat.

The purpose of this CL is to have a common size type that can be reused
from both Camera1 and Camera2 helper functions such as
CameraEnumerationAndroid.getClosestSupportedSize().

BUG=webrtc:5519

Review-Url: https://codereview.webrtc.org/2066773002
Cr-Commit-Position: refs/heads/master@{#13181}

webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java

@@ -12,8 +12,6 @@ package org.webrtc;
 
 import static java.lang.Math.abs;
 
-import org.webrtc.Logging;
-
 import android.graphics.ImageFormat;
 
 import java.util.Collections;
@@ -60,6 +58,7 @@ public class CameraEnumerationAndroid {
     public final int width;
     public final int height;
     public final FramerateRange framerate;
+
     // TODO(hbos): If VideoCapturer.startCapture is updated to support other image formats then this
     // needs to be updated and VideoCapturer.getSupportedFormats need to return CaptureFormats of
     // all imageFormats.
@@ -99,11 +98,19 @@ public class CameraEnumerationAndroid {
       return width + "x" + height + "@" + framerate;
     }
 
-    public boolean isSameFormat(final CaptureFormat that) {
-      if (that == null) {
+    @Override
+    public boolean equals(Object other) {
+      if (!(other instanceof CaptureFormat)) {
         return false;
       }
-      return width == that.width && height == that.height && framerate.equals(that.framerate);
+      final CaptureFormat otherFormat = (CaptureFormat) other;
+      return width == otherFormat.width && height == otherFormat.height
+          && framerate.equals(otherFormat.framerate);
+    }
+
+    @Override
+    public int hashCode() {
+      return 1 + (width * 65497 + height) * 251 + framerate.hashCode();
     }
   }
 
@@ -210,12 +217,13 @@ public class CameraEnumerationAndroid {
      });
   }
 
-  public static android.hardware.Camera.Size getClosestSupportedSize(
-      List<android.hardware.Camera.Size> supportedSizes, final int requestedWidth,
+  public static Size getClosestSupportedSize(
+      List<Size> supportedSizes, final int requestedWidth,
       final int requestedHeight) {
     return Collections.min(supportedSizes,
-        new ClosestComparator<android.hardware.Camera.Size>() {
-          @Override int diff(android.hardware.Camera.Size size) {
+        new ClosestComparator<Size>() {
+          @Override
+          int diff(Size size) {
             return abs(requestedWidth - size.width) + abs(requestedHeight - size.height);
           }
      });

webrtc/api/java/android/org/webrtc/CameraEnumerator.java

@@ -79,6 +79,16 @@ public class CameraEnumerator {
     return formatList;
   }
 
+  // Convert from android.hardware.Camera.Size to Size.
+  public static List<Size> convertSizes(
+      List<android.hardware.Camera.Size> cameraSizes) {
+    final List<Size> sizes = new ArrayList<Size>();
+    for (android.hardware.Camera.Size size : cameraSizes) {
+      sizes.add(new Size(size.width, size.height));
+    }
+    return sizes;
+  }
+
   // Convert from int[2] to CaptureFormat.FramerateRange.
   public static List<CaptureFormat.FramerateRange> convertFramerates(
       List<int[]> arrayRanges) {

webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java

@@ -394,23 +394,17 @@ public class VideoCapturerAndroid implements
         CameraEnumerator.convertFramerates(parameters.getSupportedPreviewFpsRange());
     Logging.d(TAG, "Available fps ranges: " + supportedFramerates);
 
-    final CaptureFormat.FramerateRange bestFpsRange;
-    if (supportedFramerates.isEmpty()) {
-      Logging.w(TAG, "No supported preview fps range");
-      bestFpsRange = new CaptureFormat.FramerateRange(0, 0);
-    } else {
-      bestFpsRange = CameraEnumerationAndroid.getClosestSupportedFramerateRange(
-            supportedFramerates, framerate);
-    }
+    final CaptureFormat.FramerateRange fpsRange =
+        CameraEnumerationAndroid.getClosestSupportedFramerateRange(supportedFramerates, framerate);
 
-    final android.hardware.Camera.Size previewSize =
-        CameraEnumerationAndroid.getClosestSupportedSize(
-            parameters.getSupportedPreviewSizes(), width, height);
-    final CaptureFormat captureFormat = new CaptureFormat(
-        previewSize.width, previewSize.height, bestFpsRange);
+    final Size previewSize = CameraEnumerationAndroid.getClosestSupportedSize(
+        CameraEnumerator.convertSizes(parameters.getSupportedPreviewSizes()), width, height);
+
+    final CaptureFormat captureFormat =
+        new CaptureFormat(previewSize.width, previewSize.height, fpsRange);
 
     // Check if we are already using this capture format, then we don't need to do anything.
-    if (captureFormat.isSameFormat(this.captureFormat)) {
+    if (captureFormat.equals(this.captureFormat)) {
       return;
     }
 
@@ -425,16 +419,15 @@ public class VideoCapturerAndroid implements
     if (captureFormat.framerate.max > 0) {
       parameters.setPreviewFpsRange(captureFormat.framerate.min, captureFormat.framerate.max);
     }
-    parameters.setPreviewSize(captureFormat.width, captureFormat.height);
+    parameters.setPreviewSize(previewSize.width, previewSize.height);
 
     if (!isCapturingToTexture) {
       parameters.setPreviewFormat(captureFormat.imageFormat);
     }
     // Picture size is for taking pictures and not for preview/video, but we need to set it anyway
     // as a workaround for an aspect ratio problem on Nexus 7.
-    final android.hardware.Camera.Size pictureSize =
-        CameraEnumerationAndroid.getClosestSupportedSize(
-            parameters.getSupportedPictureSizes(), width, height);
+    final Size pictureSize = CameraEnumerationAndroid.getClosestSupportedSize(
+        CameraEnumerator.convertSizes(parameters.getSupportedPictureSizes()), width, height);
     parameters.setPictureSize(pictureSize.width, pictureSize.height);
 
     // Temporarily stop preview if it's already running.

webrtc/base/java/src/org/webrtc/Size.java

@@ -0,0 +1,45 @@
+/*
+ *  Copyright 2016 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;
+
+/**
+ * Class for representing size of an object. Very similar to android.util.Size but available on all
+ * devices.
+ */
+public class Size {
+  public int width;
+  public int height;
+
+  public Size(int width, int height) {
+    this.width = width;
+    this.height = height;
+  }
+
+  @Override
+  public String toString() {
+    return width + "x" + height;
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (!(other instanceof Size)) {
+      return false;
+    }
+    final Size otherSize = (Size) other;
+    return width == otherSize.width && height == otherSize.height;
+  }
+
+  @Override
+  public int hashCode() {
+    // Use prime close to 2^16 to avoid collisions for normal values less than 2^16.
+    return 1 + 65537 * width + height;
+  }
+}