CameraEnumerationAndroid: Add getSupportedFormats() implementation using android.hardware.camera2

talk/app/webrtc/java/android/org/webrtc/Camera2Enumerator.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.content.Context;
+import android.graphics.ImageFormat;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.os.Build;
+import android.os.SystemClock;
+import android.util.Log;
+import android.util.Range;
+import android.util.Size;
+
+import org.webrtc.CameraEnumerationAndroid.CaptureFormat;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class Camera2Enumerator implements CameraEnumerationAndroid.Enumerator {
+  private final static String TAG = "Camera2Enumerator";
+  private final static double NANO_SECONDS_PER_SECOND = 1.0e9;
+
+  private final CameraManager cameraManager;
+  // Each entry contains the supported formats for a given camera index. The formats are enumerated
+  // lazily in getSupportedFormats(), and cached for future reference.
+  private final Map<Integer, List<CaptureFormat>> cachedSupportedFormats =
+      new HashMap<Integer, List<CaptureFormat>>();
+
+  public static boolean isSupported() {
+    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP;
+  }
+
+  public Camera2Enumerator(Context context) {
+    cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
+  }
+
+  @Override
+  public List<CaptureFormat> getSupportedFormats(int cameraId) {
+    synchronized (cachedSupportedFormats) {
+      if (cachedSupportedFormats.containsKey(cameraId)) {
+        return cachedSupportedFormats.get(cameraId);
+      }
+      Log.d(TAG, "Get supported formats for camera index " + cameraId + ".");
+      final long startTimeMs = SystemClock.elapsedRealtime();
+
+      final CameraCharacteristics cameraCharacteristics;
+      try {
+        cameraCharacteristics = cameraManager.getCameraCharacteristics(Integer.toString(cameraId));
+      } catch (Exception ex) {
+        Log.e(TAG, "getCameraCharacteristics(): " + ex);
+        return new ArrayList<CaptureFormat>();
+      }
+
+      // Calculate default max fps from auto-exposure ranges in case getOutputMinFrameDuration() is
+      // not supported.
+      final Range<Integer>[] fpsRanges =
+          cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
+      int defaultMaxFps = 0;
+      for (Range<Integer> fpsRange : fpsRanges) {
+        defaultMaxFps = Math.max(defaultMaxFps, fpsRange.getUpper());
+      }
+
+      final StreamConfigurationMap streamMap =
+          cameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+      final Size[] sizes = streamMap.getOutputSizes(ImageFormat.YUV_420_888);
+      if (sizes == null) {
+        throw new RuntimeException("ImageFormat.YUV_420_888 not supported.");
+      }
+
+      final List<CaptureFormat> formatList = new ArrayList<CaptureFormat>();
+      for (Size size : sizes) {
+        long minFrameDurationNs = 0;
+        try {
+          minFrameDurationNs = streamMap.getOutputMinFrameDuration(ImageFormat.YUV_420_888, size);
+        } catch (Exception e) {
+          // getOutputMinFrameDuration() is not supported on all devices. Ignore silently.
+        }
+        final int maxFps = (minFrameDurationNs == 0)
+                               ? defaultMaxFps
+                               : (int) Math.round(NANO_SECONDS_PER_SECOND / minFrameDurationNs);
+        formatList.add(new CaptureFormat(size.getWidth(), size.getHeight(), 0, maxFps * 1000));
+      }
+      cachedSupportedFormats.put(cameraId, formatList);
+      final long endTimeMs = SystemClock.elapsedRealtime();
+      Log.d(TAG, "Get supported formats for camera index " + cameraId + " done."
+          + " Time spent: " + (endTimeMs - startTimeMs) + " ms.");
+      return formatList;
+    }
+  }
+}