1/*
2 * Copyright (C) 2013 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.filterfw.samples.simplecamera;
20
21import android.content.Context;
22import android.hardware.Sensor;
23import android.hardware.SensorEvent;
24import android.hardware.SensorEventListener;
25import android.hardware.SensorManager;
26import android.util.Log;
27
28import androidx.media.filterfw.Filter;
29import androidx.media.filterfw.FrameType;
30import androidx.media.filterfw.FrameValue;
31import androidx.media.filterfw.FrameValues;
32import androidx.media.filterfw.MffContext;
33import androidx.media.filterfw.OutputPort;
34import androidx.media.filterfw.Signature;
35
36public final class MotionSensorWTime extends Filter implements SensorEventListener {
37
38    private SensorManager mSensorManager = null;
39    private Sensor mSensor = null;
40
41    private float[] mValues = new float[3];
42    private float[][] mTemp = new float[3][3];
43    private float[] mAvgValues = new float[3];
44    private int mCounter = 0;
45
46    public MotionSensorWTime(MffContext context, String name) {
47        super(context, name);
48    }
49
50    @Override
51    public Signature getSignature() {
52        return new Signature()
53            .addOutputPort("values", Signature.PORT_REQUIRED, FrameType.array(float.class))
54            .addOutputPort("timestamp", Signature.PORT_OPTIONAL, FrameType.single(long.class))
55            .disallowOtherPorts();
56    }
57
58    @Override
59    protected void onPrepare() {
60        mSensorManager = (SensorManager)getContext().getApplicationContext()
61                            .getSystemService(Context.SENSOR_SERVICE);
62        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);
63        // TODO: currently, the type of sensor is hardcoded. Should be able to set the sensor
64        //  type as filter input!
65        mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_UI);
66    }
67
68    @Override
69    protected void onTearDown() {
70        mSensorManager.unregisterListener(this);
71    }
72
73    @Override
74    public final void onAccuracyChanged(Sensor sensor, int accuracy) {
75        // (Do we need to do something when sensor accuracy changes?)
76    }
77
78    @Override
79    public final void onSensorChanged(SensorEvent event) {
80        synchronized(mValues) {
81            mValues[0] = event.values[0];
82            mValues[1] = event.values[1];
83            mValues[2] = event.values[2];
84        }
85    }
86
87    @Override
88    protected void onProcess() {
89        OutputPort outPort = getConnectedOutputPort("values");
90        FrameValues outFrame = outPort.fetchAvailableFrame(null).asFrameValues();
91        synchronized(mValues) {
92            if (mCounter < 3 && mCounter >= 0) {
93                mTemp[0][mCounter] = mValues[0];
94                mTemp[1][mCounter] = mValues[1];
95                mTemp[2][mCounter] = mValues[2];
96            }
97
98            mCounter = (mCounter + 1) % 3;
99
100            mAvgValues[0] = (mTemp[0][0] + mTemp[0][1] + mTemp[0][2]) / 3;
101            mAvgValues[1] = (mTemp[1][0] + mTemp[1][1] + mTemp[1][2]) / 3;
102            mAvgValues[2] = (mTemp[2][0] + mTemp[2][1] + mTemp[2][2]) / 3;
103            outFrame.setValues(mAvgValues);
104        }
105        outFrame.setTimestamp(System.currentTimeMillis() * 1000000L);
106        outPort.pushFrame(outFrame);
107
108        OutputPort timeOutPort = getConnectedOutputPort("timestamp");
109        if (timeOutPort != null) {
110            long timestamp = System.nanoTime();
111            Log.v("MotionSensor", "Timestamp is: " + timestamp);
112            FrameValue timeStampFrame = timeOutPort.fetchAvailableFrame(null).asFrameValue();
113            timeStampFrame.setValue(timestamp);
114            timeOutPort.pushFrame(timeStampFrame);
115        }
116    }
117}
118
119