Home | History | Annotate | Download | only in cenc 
      1 package com.googlecode.mp4parser.boxes.cenc;
      2 
      3 import com.coremedia.iso.BoxParser;
      4 import com.coremedia.iso.IsoFile;
      5 import com.coremedia.iso.IsoTypeReader;
      6 import com.coremedia.iso.IsoTypeWriter;
      7 import com.coremedia.iso.boxes.Box;
      8 import com.googlecode.mp4parser.AbstractFullBox;
      9 import com.googlecode.mp4parser.util.UUIDConverter;
     10 
     11 import java.io.IOException;
     12 import java.nio.ByteBuffer;
     13 import java.util.UUID;
     14 
     15 
     16 
     17 /**
     18  * This box contains information needed by a Content Protection System to play back the content. The
     19  * data format is specified by the system identified by the pssh parameter SystemID, and is considered
     20  * opaque for the purposes of this specification.
     21  * <p/>
     22  * The data encapsulated in the Data field may be read by the identified Content Protection System to
     23  * enable decryption key acquisition and decryption of media data. For license/rights-based systems, the
     24  * header information may include data such as the URL of license server(s) or rights issuer(s) used,
     25  * embedded licenses/rights, and/or other protection system specific metadata.
     26  * <p/>
     27  * A single file may be constructed to be playable by multiple key and digital rights management (DRM)
     28  * systems, by including one Protection System-Specific Header box for each system supported. Readers
     29  * that process such presentations must match the SystemID field in this box to the SystemID(s) of the
     30  * DRM System(s) they support, and select or create the matching Protection System-Specific Header
     31  * box(es) for storage and retrieval of Protection-Specific information interpreted or created by that DRM
     32  * system.
     33  */
     34 public class ProtectionSystemSpecificHeaderBox extends AbstractFullBox {
     35     public static final String TYPE = "pssh";
     36 
     37     public static byte[] OMA2_SYSTEM_ID = UUIDConverter.convert(UUID.fromString("A2B55680-6F43-11E0-9A3F-0002A5D5C51B"));
     38     public static byte[] PLAYREADY_SYSTEM_ID = UUIDConverter.convert(UUID.fromString("9A04F079-9840-4286-AB92-E65BE0885F95"));
     39 
     40     byte[] content;
     41     byte[] systemId;
     42 
     43 
     44     public byte[] getSystemId() {
     45         return systemId;
     46     }
     47 
     48     public void setSystemId(byte[] systemId) {
     49         assert systemId.length == 16;
     50         this.systemId = systemId;
     51     }
     52 
     53     public byte[] getContent() {
     54         return content;
     55     }
     56 
     57     public void setContent(byte[] content) {
     58         this.content = content;
     59     }
     60 
     61     public ProtectionSystemSpecificHeaderBox() {
     62         super(TYPE);
     63     }
     64 
     65     @Override
     66     protected long getContentSize() {
     67         return 24 + content.length;
     68     }
     69 
     70     @Override
     71     protected void getContent(ByteBuffer byteBuffer) {
     72         writeVersionAndFlags(byteBuffer);
     73         assert systemId.length == 16;
     74         byteBuffer.put(systemId, 0, 16);
     75         IsoTypeWriter.writeUInt32(byteBuffer, content.length);
     76         byteBuffer.put(content);
     77     }
     78 
     79     @Override
     80     protected void _parseDetails(ByteBuffer content) {
     81         parseVersionAndFlags(content);
     82         systemId = new byte[16];
     83         content.get(systemId);
     84         long length = IsoTypeReader.readUInt32(content);
     85         this.content = new byte[content.remaining()];
     86         content.get(this.content);
     87         assert length == this.content.length;
     88     }
     89 }
     90