CameraEnumerationAndroid: Make getSupportedFormats() an interface

Enumerating camera capabilities in the deprecated android.hardware.Camera interface is really slow because of the need to open and release the camera. By making getSupportedFormats() an interface, we allow apps the opportunity to inject their own implementation, such as storing the supported formats offline in the device's internal storage. It will also be possible to add an implementation of getSupportedFormats() using the new android.hardware.Camera2 interface in a follow-up CL.

R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1321903002 .

Cr-Commit-Position: refs/heads/master@{#9819}

1 files changed, 102 insertions, 0 deletions

diff --git a/talk/app/webrtc/java/android/org/webrtc/CameraEnumerator.java b/talk/app/webrtc/java/android/org/webrtc/CameraEnumerator.java
new file mode 100644
index 0000000000..0e6b978c9d
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+++ b/talk/app/webrtc/java/android/org/webrtc/CameraEnumerator.java
@@ -0,0 +1,102 @@
+/*
+ * 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;
+  }
+}