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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 import com.coremedia.iso.IsoFile;
     20 import com.coremedia.iso.IsoTypeReader;
     21 import com.coremedia.iso.IsoTypeWriter;
     22 import com.coremedia.iso.Utf8;
     23 import com.googlecode.mp4parser.AbstractFullBox;
     24 
     25 import java.nio.ByteBuffer;
     26 
     27 /**
     28  * The Scheme Type Box identifies the protection scheme. Resides in  a Protection Scheme Information Box or
     29  * an SRTP Process Box.
     30  *
     31  * @see com.coremedia.iso.boxes.SchemeInformationBox
     32  */
     33 public class SchemeTypeBox extends AbstractFullBox {
     34     public static final String TYPE = "schm";
     35     String schemeType = "    ";
     36     long schemeVersion;
     37     String schemeUri = null;
     38 
     39     public SchemeTypeBox() {
     40         super(TYPE);
     41     }
     42 
     43     public String getSchemeType() {
     44         return schemeType;
     45     }
     46 
     47     public long getSchemeVersion() {
     48         return schemeVersion;
     49     }
     50 
     51     public String getSchemeUri() {
     52         return schemeUri;
     53     }
     54 
     55     public void setSchemeType(String schemeType) {
     56         assert schemeType != null && schemeType.length() == 4 : "SchemeType may not be null or not 4 bytes long";
     57         this.schemeType = schemeType;
     58     }
     59 
     60     public void setSchemeVersion(int schemeVersion) {
     61         this.schemeVersion = schemeVersion;
     62     }
     63 
     64     public void setSchemeUri(String schemeUri) {
     65         this.schemeUri = schemeUri;
     66     }
     67 
     68     protected long getContentSize() {
     69         return 12 + (((getFlags() & 1) == 1) ? Utf8.utf8StringLengthInBytes(schemeUri) + 1 : 0);
     70     }
     71 
     72     @Override
     73     public void _parseDetails(ByteBuffer content) {
     74         parseVersionAndFlags(content);
     75         schemeType = IsoTypeReader.read4cc(content);
     76         schemeVersion = IsoTypeReader.readUInt32(content);
     77         if ((getFlags() & 1) == 1) {
     78             schemeUri = IsoTypeReader.readString(content);
     79         }
     80     }
     81 
     82     @Override
     83     protected void getContent(ByteBuffer byteBuffer) {
     84         writeVersionAndFlags(byteBuffer);
     85         byteBuffer.put(IsoFile.fourCCtoBytes(schemeType));
     86         IsoTypeWriter.writeUInt32(byteBuffer, schemeVersion);
     87         if ((getFlags() & 1) == 1) {
     88             byteBuffer.put(Utf8.convert(schemeUri));
     89         }
     90     }
     91 
     92     public String toString() {
     93         StringBuilder buffer = new StringBuilder();
     94         buffer.append("Schema Type Box[");
     95         buffer.append("schemeUri=").append(schemeUri).append("; ");
     96         buffer.append("schemeType=").append(schemeType).append("; ");
     97         buffer.append("schemeVersion=").append(schemeUri).append("; ");
     98         buffer.append("]");
     99         return buffer.toString();
    100     }
    101 }
    102