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/*
* Copyright (C) 2012 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.client.android.camera.open;
import android.hardware.Camera;
import android.util.Log;
public final class OpenCameraInterface {
private static final String TAG = OpenCameraInterface.class.getName();
private OpenCameraInterface() {
}
/**
* For {@link #open(int)}, means no preference for which camera to open.
*/
public static final int NO_REQUESTED_CAMERA = -1;
public static int getCameraId(int requestedId) {
int numCameras = Camera.getNumberOfCameras();
if (numCameras == 0) {
Log.w(TAG, "No cameras!");
return -1;
}
int cameraId = requestedId;
boolean explicitRequest = cameraId >= 0;
if (!explicitRequest) {
// Select a camera if no explicit camera requested
int index = 0;
while (index < numCameras) {
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
Camera.getCameraInfo(index, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
break;
}
index++;
}
cameraId = index;
}
if (cameraId < numCameras) {
return cameraId;
} else {
if (explicitRequest) {
return -1;
} else {
return 0;
}
}
}
/**
* Opens the requested camera with {@link Camera#open(int)}, if one exists.
*
* @param requestedId camera ID of the camera to use. A negative value
* or {@link #NO_REQUESTED_CAMERA} means "no preference"
* @return handle to {@link Camera} that was opened
*/
public static Camera open(int requestedId) {
int cameraId = getCameraId(requestedId);
if (cameraId == -1) {
return null;
} else {
return Camera.open(cameraId);
}
}
}
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