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      1 /*
      2  * Copyright 2008 CoreMedia AG, Hamburg
      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 com.coremedia.iso.boxes;
     18 
     19 
     20 import com.coremedia.iso.IsoTypeReader;
     21 import com.coremedia.iso.IsoTypeWriter;
     22 import com.googlecode.mp4parser.AbstractFullBox;
     23 
     24 import java.nio.ByteBuffer;
     25 
     26 import static com.googlecode.mp4parser.util.CastUtils.l2i;
     27 
     28 /**
     29  * This box containes the sample count and a table giving the size in bytes of each sample.
     30  * Defined in ISO/IEC 14496-12.
     31  */
     32 public class SampleSizeBox extends AbstractFullBox {
     33     private long sampleSize;
     34     private long[] sampleSizes = new long[0];
     35     public static final String TYPE = "stsz";
     36     int sampleCount;
     37 
     38     public SampleSizeBox() {
     39         super(TYPE);
     40     }
     41 
     42     /**
     43      * Returns the field sample size.
     44      * If sampleSize > 0 every sample has the same size.
     45      * If sampleSize == 0 the samples have different size as stated in the sampleSizes field.
     46      *
     47      * @return the sampleSize field
     48      */
     49     public long getSampleSize() {
     50         return sampleSize;
     51     }
     52 
     53     public void setSampleSize(long sampleSize) {
     54         this.sampleSize = sampleSize;
     55     }
     56 
     57 
     58     public long getSampleSizeAtIndex(int index) {
     59         if (sampleSize > 0) {
     60             return sampleSize;
     61         } else {
     62             return sampleSizes[index];
     63         }
     64     }
     65 
     66     public long getSampleCount() {
     67         if (sampleSize > 0) {
     68             return sampleCount;
     69         } else {
     70             return sampleSizes.length;
     71         }
     72 
     73     }
     74 
     75     public long[] getSampleSizes() {
     76         return sampleSizes;
     77     }
     78 
     79     public void setSampleSizes(long[] sampleSizes) {
     80         this.sampleSizes = sampleSizes;
     81     }
     82 
     83     protected long getContentSize() {
     84         return 12 + (sampleSize == 0 ? sampleSizes.length * 4 : 0);
     85     }
     86 
     87     @Override
     88     public void _parseDetails(ByteBuffer content) {
     89         parseVersionAndFlags(content);
     90         sampleSize = IsoTypeReader.readUInt32(content);
     91         sampleCount = l2i(IsoTypeReader.readUInt32(content));
     92 
     93         if (sampleSize == 0) {
     94             sampleSizes = new long[(int) sampleCount];
     95 
     96             for (int i = 0; i < sampleCount; i++) {
     97                 sampleSizes[i] = IsoTypeReader.readUInt32(content);
     98             }
     99         }
    100     }
    101 
    102     @Override
    103     protected void getContent(ByteBuffer byteBuffer) {
    104         writeVersionAndFlags(byteBuffer);
    105         IsoTypeWriter.writeUInt32(byteBuffer, sampleSize);
    106 
    107         if (sampleSize == 0) {
    108             IsoTypeWriter.writeUInt32(byteBuffer, sampleSizes.length);
    109             for (long sampleSize1 : sampleSizes) {
    110                 IsoTypeWriter.writeUInt32(byteBuffer, sampleSize1);
    111             }
    112         } else {
    113             IsoTypeWriter.writeUInt32(byteBuffer, sampleCount);
    114         }
    115 
    116     }
    117 
    118     public String toString() {
    119         return "SampleSizeBox[sampleSize=" + getSampleSize() + ";sampleCount=" + getSampleCount() + "]";
    120     }
    121 }
    122