Android Open Source - webrtc-app-mono Video Capture Device Info Android

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License

The source code is released under:

Copyright (c) 2011, The WebRTC project authors. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditi...

Java Source Code

/*
 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 *//from   w ww .j  a va  2s.  c  o m
 *  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.videoengine;

import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.content.Context;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
import android.hardware.Camera;
import android.util.Log;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class VideoCaptureDeviceInfoAndroid {
  private final static String TAG = "WEBRTC-JC";

  private static boolean isFrontFacing(CameraInfo info) {
    return info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT;
  }

  private static String deviceUniqueName(int index, CameraInfo info) {
    return "Camera " + index +", Facing " +
        (isFrontFacing(info) ? "front" : "back") +
        ", Orientation "+ info.orientation;
  }

  // Returns information about all cameras on the device as a serialized JSON
  // array of dictionaries encoding information about a single device.  Since
  // this reflects static information about the hardware present, there is no
  // need to call this function more than once in a single process.  It is
  // marked "private" as it is only called by native code.
  private static String getDeviceInfo() {
    try {
      JSONArray devices = new JSONArray();
      for (int i = 0; i < Camera.getNumberOfCameras(); ++i) {
        CameraInfo info = new CameraInfo();
        Camera.getCameraInfo(i, info);
        String uniqueName = deviceUniqueName(i, info);
        JSONObject cameraDict = new JSONObject();
        devices.put(cameraDict);
        List<Size> supportedSizes;
        List<int[]> supportedFpsRanges;
        try {
          Camera camera = Camera.open(i);
          Parameters parameters = camera.getParameters();
          supportedSizes = parameters.getSupportedPreviewSizes();
          supportedFpsRanges = parameters.getSupportedPreviewFpsRange();
          camera.release();
          Log.d(TAG, uniqueName);
        } catch (RuntimeException e) {
          Log.e(TAG, "Failed to open " + uniqueName + ", skipping");
          continue;
        }
        JSONArray sizes = new JSONArray();
        for (Size supportedSize : supportedSizes) {
          JSONObject size = new JSONObject();
          size.put("width", supportedSize.width);
          size.put("height", supportedSize.height);
          sizes.put(size);
        }
        // Android SDK deals in integral "milliframes per second"
        // (i.e. fps*1000, instead of floating-point frames-per-second) so we
        // preserve that through the Java->C++->Java round-trip.
        int[] mfps = supportedFpsRanges.get(supportedFpsRanges.size() - 1);
        cameraDict.put("name", uniqueName);
        cameraDict.put("front_facing", isFrontFacing(info))
            .put("orientation", info.orientation)
            .put("sizes", sizes)
            .put("min_mfps", mfps[Parameters.PREVIEW_FPS_MIN_INDEX])
            .put("max_mfps", mfps[Parameters.PREVIEW_FPS_MAX_INDEX]);
      }
      String ret = devices.toString(2);
      return ret;
    } catch (JSONException e) {
      throw new RuntimeException(e);
    }
  }
}

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