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package org.mozilla.gecko.media;
import org.mozilla.gecko.annotation.RobocopTarget;
import org.mozilla.gecko.annotation.WrapForJNI;
import org.mozilla.gecko.EventDispatcher;
import org.mozilla.gecko.GeckoAppShell;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.AudioManager.OnAudioFocusChangeListener;
import android.util.Log;
public class AudioFocusAgent {
private static final String LOGTAG = "AudioFocusAgent";
private static Context mContext;
private AudioManager mAudioManager;
private OnAudioFocusChangeListener mAfChangeListener;
public static final String OWN_FOCUS = "own_focus";
public static final String LOST_FOCUS = "lost_focus";
public static final String LOST_FOCUS_TRANSIENT = "lost_focus_transient";
private String mAudioFocusState = LOST_FOCUS;
@WrapForJNI(calledFrom = "gecko")
public static void notifyStartedPlaying() {
if (!isAttachedToContext()) {
return;
}
Log.d(LOGTAG, "NotifyStartedPlaying");
AudioFocusAgent.getInstance().requestAudioFocusIfNeeded();
}
@WrapForJNI(calledFrom = "gecko")
public static void notifyStoppedPlaying() {
if (!isAttachedToContext()) {
return;
}
Log.d(LOGTAG, "NotifyStoppedPlaying");
AudioFocusAgent.getInstance().abandonAudioFocusIfNeeded();
}
public synchronized void attachToContext(Context context) {
if (isAttachedToContext()) {
return;
}
mContext = context;
mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
mAfChangeListener = new OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_LOSS:
Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_LOSS");
notifyObservers("AudioFocusChanged", "lostAudioFocus");
notifyMediaControlService(MediaControlService.ACTION_PAUSE_BY_AUDIO_FOCUS);
mAudioFocusState = LOST_FOCUS;
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_LOSS_TRANSIENT");
notifyObservers("AudioFocusChanged", "lostAudioFocusTransiently");
notifyMediaControlService(MediaControlService.ACTION_PAUSE_BY_AUDIO_FOCUS);
mAudioFocusState = LOST_FOCUS_TRANSIENT;
break;
case AudioManager.AUDIOFOCUS_GAIN:
if (!mAudioFocusState.equals(LOST_FOCUS_TRANSIENT)) {
return;
}
Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_GAIN");
notifyObservers("AudioFocusChanged", "gainAudioFocus");
notifyMediaControlService(MediaControlService.ACTION_RESUME_BY_AUDIO_FOCUS);
mAudioFocusState = OWN_FOCUS;
break;
default:
}
}
};
notifyMediaControlService(MediaControlService.ACTION_INIT);
}
@RobocopTarget
public static AudioFocusAgent getInstance() {
return AudioFocusAgent.SingletonHolder.INSTANCE;
}
private static class SingletonHolder {
private static final AudioFocusAgent INSTANCE = new AudioFocusAgent();
}
private static boolean isAttachedToContext() {
return (mContext != null);
}
private void notifyObservers(String topic, String data) {
GeckoAppShell.notifyObservers(topic, data);
}
private AudioFocusAgent() {}
private void requestAudioFocusIfNeeded() {
if (mAudioFocusState.equals(OWN_FOCUS)) {
return;
}
int result = mAudioManager.requestAudioFocus(mAfChangeListener,
AudioManager.STREAM_MUSIC,
AudioManager.AUDIOFOCUS_GAIN);
String focusMsg = (result == AudioManager.AUDIOFOCUS_GAIN) ?
"AudioFocus request granted" : "AudioFoucs request failed";
Log.d(LOGTAG, focusMsg);
if (result == AudioManager.AUDIOFOCUS_GAIN) {
mAudioFocusState = OWN_FOCUS;
}
}
private void abandonAudioFocusIfNeeded() {
if (!mAudioFocusState.equals(OWN_FOCUS)) {
return;
}
Log.d(LOGTAG, "Abandon AudioFocus");
mAudioManager.abandonAudioFocus(mAfChangeListener);
mAudioFocusState = LOST_FOCUS;
}
private void notifyMediaControlService(String action) {
Intent intent = new Intent(mContext, MediaControlService.class);
intent.setAction(action);
mContext.startService(intent);
}
}
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