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/*
* Copyright (C) 2014 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.hardware.soundtrigger;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import java.lang.ref.WeakReference;
/**
* The SoundTriggerModule provides APIs to control sound models and sound detection
* on a given sound trigger hardware module.
*
* @hide
*/
public class SoundTriggerModule {
private long mNativeContext;
private int mId;
private NativeEventHandlerDelegate mEventHandlerDelegate;
// to be kept in sync with core/jni/android_hardware_SoundTrigger.cpp
private static final int EVENT_RECOGNITION = 1;
private static final int EVENT_SERVICE_DIED = 2;
private static final int EVENT_SOUNDMODEL = 3;
private static final int EVENT_SERVICE_STATE_CHANGE = 4;
SoundTriggerModule(int moduleId, SoundTrigger.StatusListener listener, Handler handler) {
mId = moduleId;
mEventHandlerDelegate = new NativeEventHandlerDelegate(listener, handler);
native_setup(new WeakReference<SoundTriggerModule>(this));
}
private native void native_setup(Object module_this);
@Override
protected void finalize() {
native_finalize();
}
private native void native_finalize();
/**
* Detach from this module. The {@link SoundTrigger.StatusListener} callback will not be called
* anymore and associated resources will be released.
* */
public native void detach();
/**
* Load a {@link SoundTrigger.SoundModel} to the hardware. A sound model must be loaded in
* order to start listening to a key phrase in this model.
* @param model The sound model to load.
* @param soundModelHandle an array of int where the sound model handle will be returned.
* @return - {@link SoundTrigger#STATUS_OK} in case of success
* - {@link SoundTrigger#STATUS_ERROR} in case of unspecified error
* - {@link SoundTrigger#STATUS_PERMISSION_DENIED} if the caller does not have
* system permission
* - {@link SoundTrigger#STATUS_NO_INIT} if the native service cannot be reached
* - {@link SoundTrigger#STATUS_BAD_VALUE} if parameters are invalid
* - {@link SoundTrigger#STATUS_DEAD_OBJECT} if the binder transaction to the native
* service fails
* - {@link SoundTrigger#STATUS_INVALID_OPERATION} if the call is out of sequence
*/
public native int loadSoundModel(SoundTrigger.SoundModel model, int[] soundModelHandle);
/**
* Unload a {@link SoundTrigger.SoundModel} and abort any pendiong recognition
* @param soundModelHandle The sound model handle
* @return - {@link SoundTrigger#STATUS_OK} in case of success
* - {@link SoundTrigger#STATUS_ERROR} in case of unspecified error
* - {@link SoundTrigger#STATUS_PERMISSION_DENIED} if the caller does not have
* system permission
* - {@link SoundTrigger#STATUS_NO_INIT} if the native service cannot be reached
* - {@link SoundTrigger#STATUS_BAD_VALUE} if the sound model handle is invalid
* - {@link SoundTrigger#STATUS_DEAD_OBJECT} if the binder transaction to the native
* service fails
*/
public native int unloadSoundModel(int soundModelHandle);
/**
* Start listening to all key phrases in a {@link SoundTrigger.SoundModel}.
* Recognition must be restarted after each callback (success or failure) received on
* the {@link SoundTrigger.StatusListener}.
* @param soundModelHandle The sound model handle to start listening to
* @param config contains configuration information for this recognition request:
* recognition mode, keyphrases, users, minimum confidence levels...
* @return - {@link SoundTrigger#STATUS_OK} in case of success
* - {@link SoundTrigger#STATUS_ERROR} in case of unspecified error
* - {@link SoundTrigger#STATUS_PERMISSION_DENIED} if the caller does not have
* system permission
* - {@link SoundTrigger#STATUS_NO_INIT} if the native service cannot be reached
* - {@link SoundTrigger#STATUS_BAD_VALUE} if the sound model handle is invalid
* - {@link SoundTrigger#STATUS_DEAD_OBJECT} if the binder transaction to the native
* service fails
* - {@link SoundTrigger#STATUS_INVALID_OPERATION} if the call is out of sequence
*/
public native int startRecognition(int soundModelHandle, SoundTrigger.RecognitionConfig config);
/**
* Stop listening to all key phrases in a {@link SoundTrigger.SoundModel}
* @param soundModelHandle The sound model handle to stop listening to
* @return - {@link SoundTrigger#STATUS_OK} in case of success
* - {@link SoundTrigger#STATUS_ERROR} in case of unspecified error
* - {@link SoundTrigger#STATUS_PERMISSION_DENIED} if the caller does not have
* system permission
* - {@link SoundTrigger#STATUS_NO_INIT} if the native service cannot be reached
* - {@link SoundTrigger#STATUS_BAD_VALUE} if the sound model handle is invalid
* - {@link SoundTrigger#STATUS_DEAD_OBJECT} if the binder transaction to the native
* service fails
* - {@link SoundTrigger#STATUS_INVALID_OPERATION} if the call is out of sequence
*/
public native int stopRecognition(int soundModelHandle);
private class NativeEventHandlerDelegate {
private final Handler mHandler;
NativeEventHandlerDelegate(final SoundTrigger.StatusListener listener,
Handler handler) {
// find the looper for our new event handler
Looper looper;
if (handler != null) {
looper = handler.getLooper();
} else {
looper = Looper.getMainLooper();
}
// construct the event handler with this looper
if (looper != null) {
// implement the event handler delegate
mHandler = new Handler(looper) {
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case EVENT_RECOGNITION:
if (listener != null) {
listener.onRecognition(
(SoundTrigger.RecognitionEvent)msg.obj);
}
break;
case EVENT_SOUNDMODEL:
if (listener != null) {
listener.onSoundModelUpdate(
(SoundTrigger.SoundModelEvent)msg.obj);
}
break;
case EVENT_SERVICE_STATE_CHANGE:
if (listener != null) {
listener.onServiceStateChange(msg.arg1);
}
break;
case EVENT_SERVICE_DIED:
if (listener != null) {
listener.onServiceDied();
}
break;
default:
break;
}
}
};
} else {
mHandler = null;
}
}
Handler handler() {
return mHandler;
}
}
@SuppressWarnings("unused")
private static void postEventFromNative(Object module_ref,
int what, int arg1, int arg2, Object obj) {
SoundTriggerModule module = (SoundTriggerModule)((WeakReference)module_ref).get();
if (module == null) {
return;
}
NativeEventHandlerDelegate delegate = module.mEventHandlerDelegate;
if (delegate != null) {
Handler handler = delegate.handler();
if (handler != null) {
Message m = handler.obtainMessage(what, arg1, arg2, obj);
handler.sendMessage(m);
}
}
}
}
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