CameraEnumerationAndroid: Make getSupportedFormats() an interface

talk/app/webrtc/java/android/org/webrtc/CameraEnumerator.java

+/*
+ * libjingle
+ * Copyright 2015 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.webrtc;
+
+import android.hardware.Camera;
+import android.os.SystemClock;
+import android.util.Log;
+
+import org.webrtc.CameraEnumerationAndroid.CaptureFormat;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@SuppressWarnings("deprecation")
+public class CameraEnumerator implements CameraEnumerationAndroid.Enumerator {
+  private final static String TAG = "CameraEnumerator";
+  // Each entry contains the supported formats for corresponding camera index. The formats for all
+  // cameras are enumerated on the first call to getSupportedFormats(), and cached for future
+  // reference.
+  private List<List<CaptureFormat>> cachedSupportedFormats;
+
+  @Override
+  public List<CaptureFormat> getSupportedFormats(int cameraId) {
+    synchronized (this) {
+      if (cachedSupportedFormats == null) {
+        cachedSupportedFormats = new ArrayList<List<CaptureFormat>>();
+        for (int i = 0; i < CameraEnumerationAndroid.getDeviceCount(); ++i) {
+          cachedSupportedFormats.add(enumerateFormats(i));
+        }
+      }
+    }
+    return cachedSupportedFormats.get(cameraId);
+  }
+
+  private List<CaptureFormat> enumerateFormats(int cameraId) {
+    Log.d(TAG, "Get supported formats for camera index " + cameraId + ".");
+    final long startTimeMs = SystemClock.elapsedRealtime();
+    final Camera.Parameters parameters;
+    Camera camera = null;
+    try {
+      Log.d(TAG, "Opening camera with index " + cameraId);
+      camera = Camera.open(cameraId);
+      parameters = camera.getParameters();
+    } catch (RuntimeException e) {
+      Log.e(TAG, "Open camera failed on camera index " + cameraId, e);
+      return new ArrayList<CaptureFormat>();
+    } finally {
+      if (camera != null) {
+        camera.release();
+      }
+    }
+
+    final List<CaptureFormat> formatList = new ArrayList<CaptureFormat>();
+    try {
+      int minFps = 0;
+      int maxFps = 0;
+      final List<int[]> listFpsRange = parameters.getSupportedPreviewFpsRange();
+      if (listFpsRange != null) {
+        // getSupportedPreviewFpsRange() returns a sorted list. Take the fps range
+        // corresponding to the highest fps.
+        final int[] range = listFpsRange.get(listFpsRange.size() - 1);
+        minFps = range[Camera.Parameters.PREVIEW_FPS_MIN_INDEX];
+        maxFps = range[Camera.Parameters.PREVIEW_FPS_MAX_INDEX];
+      }
+      for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
+        formatList.add(new CaptureFormat(size.width, size.height, minFps, maxFps));
+      }
+    } catch (Exception e) {
+      Log.e(TAG, "getSupportedFormats() failed on camera index " + cameraId, e);
+    }
+
+    final long endTimeMs = SystemClock.elapsedRealtime();
+    Log.d(TAG, "Get supported formats for camera index " + cameraId + " done."
+        + " Time spent: " + (endTimeMs - startTimeMs) + " ms.");
+    return formatList;
+  }
+}