org.jaudiotagger.audio.asf.io
Class ExtContentDescReader

java.lang.Object
  org.jaudiotagger.audio.asf.io.ExtContentDescReader

All Implemented Interfaces:

ChunkReader

public class ExtContentDescReader
extends java.lang.Object
implements ChunkReader

Class for reading Tag information out of the extended content description of an ASF file.

Author:

Christian Laireiter

See Also:

ExtendedContentDescription

Method Summary

boolean	canFail() Tells whether the reader can fail to return a valid chunk. The current Use would be a modified version of StreamChunkReader, which is configured to only manage audio streams.
GUID	getApplyingId() Returns the GUID identifying the type of chunk, this reader will parse.
Chunk	read(GUID guid, java.io.InputStream stream, long chunkStart) Parses the chunk.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

canFail

public boolean canFail()

Tells whether the reader can fail to return a valid chunk.
The current Use would be a modified version of StreamChunkReader, which is configured to only manage audio streams. However, the primary GUID for audio and video streams is the same. So if a stream shows itself to be a video stream, the reader would return null.

Specified by:

canFail in interface ChunkReader

Returns:

true, if further analysis of the chunk can show, that the reader is not applicable, despite the header GUID identification told it can handle the chunk.

getApplyingId

public GUID getApplyingId()

Returns the GUID identifying the type of chunk, this reader will parse.

Specified by:

getApplyingId in interface ChunkReader

Returns:

the GUID identifying the type of chunk, this reader will parse.

read

public Chunk read(GUID guid,
                  java.io.InputStream stream,
                  long chunkStart)
           throws java.io.IOException

Parses the chunk.

Specified by:

read in interface ChunkReader

Parameters:

guid - the GUID of the chunks header, which is about to be read.

stream - source to read chunk from.
No GUID is expected at the currents stream position. The length of the chunk is about to follow.

chunkStart - the position in stream, the chunk starts.

Returns:

the read chunk. (Mostly a subclass of Chunk).

Throws:

java.io.IOException - On I/O Errors.