Home | History | Annotate | Download | only in model 
      1 /*
      2 Copyright (c) 2011 Stanislav Vitvitskiy
      3 
      4 Permission is hereby granted, free of charge, to any person obtaining a copy of this
      5 software and associated documentation files (the "Software"), to deal in the Software
      6 without restriction, including without limitation the rights to use, copy, modify,
      7 merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
      8 permit persons to whom the Software is furnished to do so, subject to the following
      9 conditions:
     10 
     11 The above copyright notice and this permission notice shall be included in all copies or
     12 substantial portions of the Software.
     13 
     14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
     15 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
     16 PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
     17 FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     18 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
     19 OR OTHER DEALINGS IN THE SOFTWARE.
     20 */
     21 package com.googlecode.mp4parser.h264.model;
     22 
     23 import com.googlecode.mp4parser.h264.read.CAVLCReader;
     24 import com.googlecode.mp4parser.h264.write.CAVLCWriter;
     25 
     26 import java.io.IOException;
     27 
     28 /**
     29  * Scaling list entity
     30  * <p/>
     31  * capable to serialize / deserialize with CAVLC bitstream
     32  *
     33  * @author Stanislav Vitvitskiy
     34  */
     35 public class ScalingList {
     36 
     37     public int[] scalingList;
     38     public boolean useDefaultScalingMatrixFlag;
     39 
     40     public void write(CAVLCWriter out) throws IOException {
     41         if (useDefaultScalingMatrixFlag) {
     42             out.writeSE(0, "SPS: ");
     43             return;
     44         }
     45 
     46         int lastScale = 8;
     47         int nextScale = 8;
     48         for (int j = 0; j < scalingList.length; j++) {
     49             if (nextScale != 0) {
     50                 int deltaScale = scalingList[j] - lastScale - 256;
     51                 out.writeSE(deltaScale, "SPS: ");
     52             }
     53             lastScale = scalingList[j];
     54         }
     55     }
     56 
     57     public static ScalingList read(CAVLCReader is, int sizeOfScalingList)
     58             throws IOException {
     59 
     60         ScalingList sl = new ScalingList();
     61         sl.scalingList = new int[sizeOfScalingList];
     62         int lastScale = 8;
     63         int nextScale = 8;
     64         for (int j = 0; j < sizeOfScalingList; j++) {
     65             if (nextScale != 0) {
     66                 int deltaScale = is.readSE("deltaScale");
     67                 nextScale = (lastScale + deltaScale + 256) % 256;
     68                 sl.useDefaultScalingMatrixFlag = (j == 0 && nextScale == 0);
     69             }
     70             sl.scalingList[j] = nextScale == 0 ? lastScale : nextScale;
     71             lastScale = sl.scalingList[j];
     72         }
     73         return sl;
     74     }
     75 
     76     @Override
     77     public String toString() {
     78         return "ScalingList{" +
     79                 "scalingList=" + scalingList +
     80                 ", useDefaultScalingMatrixFlag=" + useDefaultScalingMatrixFlag +
     81                 '}';
     82     }
     83 }