content: /*
   * 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.performance;
  
  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 android.os.SystemClock;
  
  /**
   * @hide
   */
  public class ThroughputFilter extends Filter {
  
      @GenerateFieldPort(name = "period", hasDefault = true)
      private int mPeriod = 5;
  
      private long mLastTime = 0;
  
      private int mTotalFrameCount = 0;
      private int mPeriodFrameCount = 0;
  
      private FrameFormat mOutputFormat;
  
      public ThroughputFilter(String name) {
          super(name);
      }
  
      @Override
      public void setupPorts() {
          // Add input ports
          addInputPort("frame");
  
          // Add output ports
          mOutputFormat = ObjectFormat.fromClass(Throughput.class, FrameFormat.TARGET_SIMPLE);
          addOutputBasedOnInput("frame", "frame");
          addOutputPort("throughput", mOutputFormat);
      }
  
      @Override
      public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
          return inputFormat;
      }
  
      @Override
      public void open(FilterContext env) {
          mTotalFrameCount = 0;
          mPeriodFrameCount = 0;
          mLastTime = 0;
      }
  
      @Override
      public void process(FilterContext context) {
          // Pass through input frame
          Frame input = pullInput("frame");
          pushOutput("frame", input);
  
          // Update stats
          ++mTotalFrameCount;
          ++mPeriodFrameCount;
  
          // Check clock
          if (mLastTime == 0) {
              mLastTime = SystemClock.elapsedRealtime();
          }
          long curTime = SystemClock.elapsedRealtime();
  
          // Output throughput info if time period is up
          if ((curTime - mLastTime) >= (mPeriod * 1000)) {
              FrameFormat inputFormat = input.getFormat();
              int pixelCount = inputFormat.getWidth() * inputFormat.getHeight();
              Throughput throughput = new Throughput(mTotalFrameCount,
                                                     mPeriodFrameCount,
                                                     mPeriod,
                                                     pixelCount);
              Frame throughputFrame = context.getFrameManager().newFrame(mOutputFormat);
              throughputFrame.setObjectValue(throughput);
              pushOutput("throughput", throughputFrame);
              mLastTime = curTime;
              mPeriodFrameCount = 0;
          }
      }
  
  
  }
  