1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17// Make values from a motion sensor (e.g., accelerometer) available as filter outputs.
18
19package androidx.media.filterpacks.sensors;
20
21import android.content.Context;
22import android.hardware.Sensor;
23import android.hardware.SensorEvent;
24import android.hardware.SensorEventListener;
25import android.hardware.SensorManager;
26
27import androidx.media.filterfw.Filter;
28import androidx.media.filterfw.FrameType;
29import androidx.media.filterfw.FrameValues;
30import androidx.media.filterfw.MffContext;
31import androidx.media.filterfw.OutputPort;
32import androidx.media.filterfw.Signature;
33
34public final class MotionSensor extends Filter implements SensorEventListener {
35
36    private SensorManager mSensorManager = null;
37    private Sensor mSensor = null;
38
39    private float[] mValues = new float[3];
40
41    public MotionSensor(MffContext context, String name) {
42        super(context, name);
43    }
44
45    @Override
46    public Signature getSignature() {
47        return new Signature()
48            .addOutputPort("values", Signature.PORT_REQUIRED, FrameType.array(float.class))
49            .disallowOtherPorts();
50    }
51
52    @Override
53    protected void onPrepare() {
54        mSensorManager = (SensorManager)getContext().getApplicationContext()
55                            .getSystemService(Context.SENSOR_SERVICE);
56        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);
57        // TODO: currently, the type of sensor is hardcoded. Should be able to set the sensor
58        //  type as filter input!
59        mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_UI);
60    }
61
62    @Override
63    protected void onTearDown() {
64        mSensorManager.unregisterListener(this);
65    }
66
67    @Override
68    public final void onAccuracyChanged(Sensor sensor, int accuracy) {
69        // (Do we need to do something when sensor accuracy changes?)
70    }
71
72    @Override
73    public final void onSensorChanged(SensorEvent event) {
74        synchronized(mValues) {
75            mValues[0] = event.values[0];
76            mValues[1] = event.values[1];
77            mValues[2] = event.values[2];
78        }
79    }
80
81    @Override
82    protected void onProcess() {
83        OutputPort outPort = getConnectedOutputPort("values");
84        FrameValues outFrame = outPort.fetchAvailableFrame(null).asFrameValues();
85        synchronized(mValues) {
86            outFrame.setValues(mValues);
87        }
88        outFrame.setTimestamp(System.currentTimeMillis() * 1000000L);
89        outPort.pushFrame(outFrame);
90    }
91}
92
93