CameraManager.java
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/*
* Copyright (C) 2008 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.zbar.scan;
import android.content.Context;
import android.graphics.Point;
import android.hardware.Camera;
import android.util.Log;
import java.io.IOException;
public final class CameraManager {
private static final String TAG = CameraManager.class.getSimpleName();
private final CameraConfigurationManager configManager;
private Camera camera;
private boolean initialized;
public CameraManager(Context context) {
this.configManager = new CameraConfigurationManager(context);
}
/**
* Opens the camera driver and initializes the hardware parameters.
*
* @param holder
* The surface object which the camera will draw preview frames
* into.
* @throws IOException
* Indicates the camera driver failed to open.
*/
public synchronized void openDriver() throws IOException {
Camera theCamera = camera;
if (theCamera == null) {
theCamera = Camera.open();
if (theCamera == null) {
throw new IOException();
}
camera = theCamera;
}
if (!initialized) {
initialized = true;
configManager.initFromCameraParameters(theCamera);
}
Camera.Parameters parameters = theCamera.getParameters();
String parametersFlattened = parameters == null ? null : parameters.flatten(); // Save
// these,
// temporarily
try {
configManager.setDesiredCameraParameters(theCamera);
} catch (RuntimeException re) {
// Driver failed
Log.w(TAG, "Camera rejected parameters. Setting only minimal safe-mode parameters");
Log.i(TAG, "Resetting to saved camera params: " + parametersFlattened);
// Reset:
if (parametersFlattened != null) {
parameters = theCamera.getParameters();
parameters.unflatten(parametersFlattened);
try {
theCamera.setParameters(parameters);
configManager.setDesiredCameraParameters(theCamera);
} catch (RuntimeException re2) {
// Well, darn. Give up
Log.w(TAG, "Camera rejected even safe-mode parameters! No configuration");
}
}
}
}
public synchronized boolean isOpen() {
return camera != null;
}
public Camera getCamera(){
return camera;
}
/**
* Closes the camera driver if still in use.
*/
public synchronized void closeDriver() {
if (camera != null) {
camera.release();
camera = null;
}
}
public Point getCameraResolution() {
return configManager.getCameraResolution();
}
}