| /* |
| * Copyright (C) 2011 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.filterpacks.numeric; |
| |
| import android.filterfw.core.Filter; |
| import android.filterfw.core.FilterContext; |
| import android.filterfw.core.Frame; |
| import android.filterfw.core.FrameFormat; |
| import android.filterfw.core.GenerateFieldPort; |
| import android.filterfw.format.ObjectFormat; |
| |
| import java.lang.Math; |
| |
| /** |
| * @hide |
| */ |
| public class SinWaveFilter extends Filter { |
| |
| @GenerateFieldPort(name = "stepSize", hasDefault = true) |
| private float mStepSize = 0.05f; |
| |
| private float mValue = 0.0f; |
| |
| private FrameFormat mOutputFormat; |
| |
| public SinWaveFilter(String name) { |
| super(name); |
| } |
| |
| @Override |
| public void setupPorts() { |
| mOutputFormat = ObjectFormat.fromClass(Float.class, FrameFormat.TARGET_SIMPLE); |
| addOutputPort("value", mOutputFormat); |
| } |
| |
| @Override |
| public void open(FilterContext env) { |
| mValue = 0.0f; |
| } |
| |
| @Override |
| public void process(FilterContext env) { |
| Frame output = env.getFrameManager().newFrame(mOutputFormat); |
| output.setObjectValue(((float)Math.sin(mValue) + 1.0f) / 2.0f); |
| pushOutput("value", output); |
| mValue += mStepSize; |
| output.release(); |
| } |
| |
| |
| } |