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/**
* Copyright (C) 2016 The DirtyUnicorns Project
*
* @author: Randall Rushing <randall.rushing@gmail.com>
*
* 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.
*
* Control state of visualizer link, stream validation, and the flow
* of data to listener
*
*/
package com.android.systemui.pulse;
import android.content.Context;
import android.media.audiofx.Visualizer;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import com.android.systemui.Dependency;
import com.android.systemui.UiOffloadThread;
public class VisualizerStreamHandler {
public interface Listener {
public void onStreamAnalyzed(boolean isValid);
public void onFFTUpdate(byte[] bytes);
public void onWaveFormUpdate(byte[] bytes);
}
protected static final String TAG = VisualizerStreamHandler.class.getSimpleName();
protected static final boolean ENABLE_WAVEFORM = false;
protected static final int MSG_STREAM_VALID = 55;
protected static final int MSG_STREAM_INVALID = 56;
// we have 6 seconds to get three consecutive valid frames
protected static final int VALIDATION_TIME_MILLIS = 6000;
protected static final int VALID_BYTES_THRESHOLD = 3;
protected Visualizer mVisualizer;
protected int mAudioSessionId;
// manage stream validation
protected int mConsecutiveFrames;
protected boolean mIsValidated;
protected boolean mIsAnalyzed;
protected boolean mIsPrepared;
protected boolean mIsPaused;
protected Context mContext;
protected PulseController mController;
protected Listener mListener;
private final UiOffloadThread mUiOffloadThread;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message m) {
switch (m.what) {
case MSG_STREAM_VALID:
mIsAnalyzed = true;
mIsValidated = true;
mIsPrepared = false;
mListener.onStreamAnalyzed(true);
break;
case MSG_STREAM_INVALID:
mIsAnalyzed = true;
mIsValidated = false;
mIsPrepared = false;
mListener.onStreamAnalyzed(false);
break;
}
}
};
public VisualizerStreamHandler(Context context, PulseController controller,
VisualizerStreamHandler.Listener listener) {
mContext = context;
mController = controller;
mListener = listener;
mUiOffloadThread = Dependency.get(UiOffloadThread.class);
}
/**
* Links the visualizer to a player
*
* @param player - MediaPlayer instance to link to
*/
public final void link(int audioSessionId) {
mUiOffloadThread.submit(() -> {
if (mVisualizer != null && audioSessionId != mAudioSessionId) {
mVisualizer.setEnabled(false);
mVisualizer.release();
mVisualizer = null;
}
pause();
resetAnalyzer();
mAudioSessionId = audioSessionId;
if (mVisualizer == null) {
try {
mVisualizer = new Visualizer(audioSessionId);
} catch (Exception e) {
Log.e(TAG, "Error enabling visualizer!", e);
return;
}
mVisualizer.setEnabled(false);
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
Visualizer.OnDataCaptureListener captureListener = new Visualizer.OnDataCaptureListener() {
@Override
public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes,
int samplingRate) {
if (ENABLE_WAVEFORM) {
analyze(bytes);
if (isValidStream() && !mIsPaused) {
mListener.onWaveFormUpdate(bytes);
}
}
}
@Override
public void onFftDataCapture(Visualizer visualizer, byte[] bytes,
int samplingRate) {
analyze(bytes);
if (isValidStream() && !mIsPaused) {
mListener.onFFTUpdate(bytes);
}
}
};
mVisualizer.setDataCaptureListener(captureListener,
(int) (Visualizer.getMaxCaptureRate() * 0.75), ENABLE_WAVEFORM, true);
}
mVisualizer.setEnabled(true);
});
}
public final void unlink() {
if (mVisualizer != null) {
pause();
mVisualizer.setEnabled(false);
mVisualizer.release();
mVisualizer = null;
resetAnalyzer();
}
}
public boolean isValidStream() {
return mIsAnalyzed && mIsValidated;
}
public void resetAnalyzer() {
mIsAnalyzed = false;
mIsValidated = false;
mIsPrepared = false;
mConsecutiveFrames = 0;
}
public void pause() {
mIsPaused = true;
}
public void resume() {
mIsPaused = false;
}
private void analyze(byte[] data) {
if (mIsAnalyzed) {
return;
}
if (!mIsPrepared) {
mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_STREAM_INVALID),
VALIDATION_TIME_MILLIS);
mIsPrepared = true;
}
if (isDataEmpty(data)) {
mConsecutiveFrames = 0;
} else {
mConsecutiveFrames++;
}
if (mConsecutiveFrames == VALID_BYTES_THRESHOLD) {
mIsPaused = true;
mHandler.removeMessages(MSG_STREAM_INVALID);
mHandler.sendEmptyMessage(MSG_STREAM_VALID);
}
}
private boolean isDataEmpty(byte[] data) {
for (int i = 0; i < data.length; i++) {
if (data[i] != 0) {
return false;
}
}
return true;
}
}
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