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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 android.filterpacks.base;
import android.filterfw.core.Filter;
import android.filterfw.core.FilterContext;
import android.filterfw.core.Frame;
import android.filterfw.core.FrameFormat;
import android.filterfw.core.GenerateFieldPort;
import android.filterfw.core.GenerateFinalPort;
import android.filterfw.core.KeyValueMap;
import android.filterfw.core.NativeProgram;
import android.filterfw.core.NativeFrame;
import android.filterfw.core.Program;
import android.os.Handler;
import android.os.Looper;
import java.lang.Runnable;
/**
* @hide
*/
public class CallbackFilter extends Filter {
@GenerateFieldPort(name = "listener", hasDefault = true)
private FilterContext.OnFrameReceivedListener mListener;
@GenerateFieldPort(name = "userData", hasDefault = true)
private Object mUserData;
@GenerateFinalPort(name = "callUiThread", hasDefault = true)
private boolean mCallbacksOnUiThread = true;
private Handler mUiThreadHandler;
private class CallbackRunnable implements Runnable {
private Filter mFilter;
private Frame mFrame;
private Object mUserData;
private FilterContext.OnFrameReceivedListener mListener;
public CallbackRunnable(FilterContext.OnFrameReceivedListener listener, Filter filter, Frame frame, Object userData) {
mListener = listener;
mFilter = filter;
mFrame = frame;
mUserData = userData;
}
public void run() {
mListener.onFrameReceived(mFilter, mFrame, mUserData);
mFrame.release();
}
}
public CallbackFilter(String name) {
super(name);
}
@Override
public void setupPorts() {
addInputPort("frame");
}
public void prepare(FilterContext context) {
if (mCallbacksOnUiThread) {
mUiThreadHandler = new Handler(Looper.getMainLooper());
}
}
public void process(FilterContext context) {
// Get frame and forward to listener
final Frame input = pullInput("frame");
if (mListener != null) {
if (mCallbacksOnUiThread) {
input.retain();
CallbackRunnable uiRunnable = new CallbackRunnable(mListener, this, input, mUserData);
if (!mUiThreadHandler.post(uiRunnable)) {
throw new RuntimeException("Unable to send callback to UI thread!");
}
} else {
mListener.onFrameReceived(this, input, mUserData);
}
} else {
throw new RuntimeException("CallbackFilter received frame, but no listener set!");
}
}
}
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