File	Doc	Category	Size	Date	Package
AsfHeaderReader.java	API Doc	Jaudiotagger 2.0.4	9095	Wed Mar 30 16:11:50 BST 2011	org.jaudiotagger.audio.asf.io

AsfHeaderReader

• java.lang.Object
  • ChunkContainerReader

Fields Summary
private static final org.jaudiotagger.audio.asf.data.GUID[]	APPLYING The GUID this reader {@linkplain #getApplyingIds() applies to}
private static final AsfHeaderReader	FULL_READER ASF reader configured to extract all information.
private static final AsfHeaderReader	INFO_READER ASF reader configured to just extract information about audio streams. If the ASF file only contains one audio stream it works fine.
private static final AsfHeaderReader	TAG_READER ASF reader configured to just extract metadata information.

Constructors Summary
public AsfHeaderReader(List toRegister, boolean readChunkOnce) Creates an instance of this reader. param toRegister The chunk readers to utilize. param readChunkOnce if true, each chunk type (identified by chunk GUID) will handled only once, if a reader is available, other chunks will be discarded. super(toRegister, readChunkOnce);

Methods Summary
public boolean	canFail() {@inheritDoc} return false;
protected org.jaudiotagger.audio.asf.data.AsfHeader	createContainer(long streamPosition, java.math.BigInteger chunkLength, java.io.InputStream stream) {@inheritDoc} final long chunkCount = Utils.readUINT32(stream); /* * 2 reserved bytes. first should be equal to 0x01 and second 0x02. ASF * specification suggests to not read the content if second byte is not * 0x02. */ if (stream.read() != 1) { throw new IOException("No ASF"); //$NON-NLS-1$ } if (stream.read() != 2) { throw new IOException("No ASF"); //$NON-NLS-1$ } /* * Creating the resulting object */ return new AsfHeader(streamPosition, chunkLength, chunkCount);
private static java.io.InputStream	createStream(java.io.RandomAccessFile raf) Creates a Stream that will read from the specified {@link RandomAccessFile}; param raf data source to read from. return a stream which accesses the source. final List<Class<? extends ChunkReader>> readers = new ArrayList<Class<? extends ChunkReader>>(); readers.add(FileHeaderReader.class); readers.add(StreamChunkReader.class); INFO_READER = new AsfHeaderReader(readers, true); readers.clear(); readers.add(ContentDescriptionReader.class); readers.add(ContentBrandingReader.class); readers.add(LanguageListReader.class); readers.add(MetadataReader.class); /* * Create the header extension object readers with just content * description reader, extended content description reader, language * list reader and both metadata object readers. */ final AsfExtHeaderReader extReader = new AsfExtHeaderReader(readers, true); final AsfExtHeaderReader extReader2 = new AsfExtHeaderReader(readers, true); TAG_READER = new AsfHeaderReader(readers, true); TAG_READER.setExtendedHeaderReader(extReader); readers.add(FileHeaderReader.class); readers.add(StreamChunkReader.class); readers.add(EncodingChunkReader.class); readers.add(EncryptionChunkReader.class); readers.add(StreamBitratePropertiesReader.class); FULL_READER = new AsfHeaderReader(readers, false); FULL_READER.setExtendedHeaderReader(extReader2); return new FullRequestInputStream(new BufferedInputStream( new RandomAccessFileInputstream(raf)));
public org.jaudiotagger.audio.asf.data.GUID[]	getApplyingIds() {@inheritDoc} return APPLYING.clone();
public static org.jaudiotagger.audio.asf.data.AsfHeader	readHeader(java.io.File file) This method extracts the full ASF-Header from the given file. If no header could be extracted null is returned. param file the ASF file to read. return AsfHeader-Wrapper, or null if no supported ASF header was found. throws IOException on I/O Errors. final InputStream stream = new FileInputStream(file); final AsfHeader result = FULL_READER.read(Utils.readGUID(stream), stream, 0); stream.close(); return result;
public static org.jaudiotagger.audio.asf.data.AsfHeader	readHeader(java.io.RandomAccessFile file) This method tries to extract a full ASF-header out of the given stream. If no header could be extracted null is returned. param file File which contains the ASF header. return AsfHeader-Wrapper, or null if no supported ASF header was found. throws IOException Read errors final InputStream stream = createStream(file); return FULL_READER.read(Utils.readGUID(stream), stream, 0);
public static org.jaudiotagger.audio.asf.data.AsfHeader	readInfoHeader(java.io.RandomAccessFile file) This method tries to extract an ASF-header out of the given stream, which only contains information about the audio stream. If no header could be extracted null is returned. param file File which contains the ASF header. return AsfHeader-Wrapper, or null if no supported ASF header was found. throws IOException Read errors final InputStream stream = createStream(file); return INFO_READER.read(Utils.readGUID(stream), stream, 0);
public static org.jaudiotagger.audio.asf.data.AsfHeader	readTagHeader(java.io.RandomAccessFile file) This method tries to extract an ASF-header out of the given stream, which only contains metadata. If no header could be extracted null is returned. param file File which contains the ASF header. return AsfHeader-Wrapper, or null if no supported ASF header was found. throws IOException Read errors final InputStream stream = createStream(file); return TAG_READER.read(Utils.readGUID(stream), stream, 0);
public void	setExtendedHeaderReader(AsfExtHeaderReader extReader) Sets the {@link AsfExtHeaderReader}, which is to be used, when an header extension object is found. param extReader header extension object reader. for (final GUID curr : extReader.getApplyingIds()) { this.readerMap.put(curr, extReader); }