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 package androidx.media.filterpacks.numeric; 18 19 import android.util.Log; 20 import androidx.media.filterfw.Filter; 21 import androidx.media.filterfw.FrameType; 22 import androidx.media.filterfw.FrameValue; 23 import androidx.media.filterfw.MffContext; 24 import androidx.media.filterfw.OutputPort; 25 import androidx.media.filterfw.Signature; 26 27 /** 28 * Filter to calculate the 2-norm of the inputs. i.e. sqrt(x^2 + y^2) 29 * TODO: Add support for more norms in the future. 30 */ 31 public final class NormFilter extends Filter { 32 private static final String TAG = "NormFilter"; 33 private static boolean mLogVerbose = Log.isLoggable(TAG, Log.VERBOSE); 34 NormFilter(MffContext context, String name)35 public NormFilter(MffContext context, String name) { 36 super(context, name); 37 } 38 39 @Override getSignature()40 public Signature getSignature() { 41 FrameType floatT = FrameType.single(float.class); 42 return new Signature() 43 .addInputPort("x", Signature.PORT_REQUIRED, floatT) 44 .addInputPort("y", Signature.PORT_REQUIRED, floatT) 45 .addOutputPort("norm", Signature.PORT_REQUIRED, floatT) 46 .disallowOtherPorts(); 47 } 48 49 @Override onProcess()50 protected void onProcess() { 51 FrameValue xFrameValue = getConnectedInputPort("x").pullFrame().asFrameValue(); 52 float xValue = ((Float)xFrameValue.getValue()).floatValue(); 53 FrameValue yFrameValue = getConnectedInputPort("y").pullFrame().asFrameValue(); 54 float yValue = ((Float)yFrameValue.getValue()).floatValue(); 55 56 float norm = (float) Math.hypot(xValue, yValue); 57 if (mLogVerbose) Log.v(TAG, "Norm = " + norm); 58 OutputPort outPort = getConnectedOutputPort("norm"); 59 FrameValue outFrame = outPort.fetchAvailableFrame(null).asFrameValue(); 60 outFrame.setValue(norm); 61 outPort.pushFrame(outFrame); 62 } 63 } 64