de.jarnbjo.ogg

Class CachedUrlStream

java.lang.Object

de.jarnbjo.ogg.CachedUrlStream

All Implemented Interfaces:

PhysicalOggStream

public class CachedUrlStream
extends Object
implements PhysicalOggStream

Implementation of the PhysicalOggStream interface for reading and caching an Ogg stream from a URL. This class reads the data as fast as possible from the URL, caches it locally either in memory or on disk, and supports seeking within the available data.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	CachedUrlStream.LoaderThread

Constructor Summary

Constructors

Constructor and Description
CachedUrlStream(URL source) Creates an instance of this class, using a memory cache.
CachedUrlStream(URL source, RandomAccessFile drain) Creates an instance of this class, using the specified file as cache.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this stream.
long	getCacheLength()
Collection	getLogicalStreams() Returns a collection of objects implementing LogicalOggStream for accessing the separate logical streams within this physical Ogg stream.
OggPage	getOggPage(int index) Return the Ogg page with the absolute index index, independent from the logical structure of this stream or if the index parameter is -1, the next Ogg page is returned.
boolean	isOpen() Checks if this stream is open for reading.
boolean	isSeekable()
void	setTime(long granulePosition) Sets this stream's (and its logical stream's) position to the granule position.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedUrlStream

public CachedUrlStream(URL source)
                throws OggFormatException,
                       IOException

Creates an instance of this class, using a memory cache.

Throws:

OggFormatException

IOException

CachedUrlStream

public CachedUrlStream(URL source,
                       RandomAccessFile drain)
                throws OggFormatException,
                       IOException

Creates an instance of this class, using the specified file as cache. The file is not automatically deleted when this class is disposed.

Throws:

OggFormatException

IOException

Method Detail

getLogicalStreams

public Collection getLogicalStreams()

Description copied from interface: PhysicalOggStream

Returns a collection of objects implementing LogicalOggStream for accessing the separate logical streams within this physical Ogg stream.

Specified by:

getLogicalStreams in interface PhysicalOggStream

Returns:

a collection of objects implementing LogicalOggStream which are representing the logical streams contained within this physical stream

See Also:

LogicalOggStream

isOpen

public boolean isOpen()

Description copied from interface: PhysicalOggStream

Checks if this stream is open for reading.

Specified by:

isOpen in interface PhysicalOggStream

Returns:

true if this stream is open for reading, false otherwise

close

public void close()
           throws IOException

Description copied from interface: PhysicalOggStream

Closes this stream. After invoking this method, no further access to the streams data is possible.

Specified by:

close in interface PhysicalOggStream

Throws:

IOException

getCacheLength

public long getCacheLength()

getOggPage

public OggPage getOggPage(int index)
                   throws IOException

Description copied from interface: PhysicalOggStream

Return the Ogg page with the absolute index index, independent from the logical structure of this stream or if the index parameter is -1, the next Ogg page is returned. This method should only be used by implementations of LogicalOggStream to access the raw pages.

Specified by:

getOggPage in interface PhysicalOggStream

Parameters:

index - the absolute index starting from 0 at the beginning of the file or stream or -1 to get the next page in a non-seekable stream

Returns:

the Ogg page with the physical absolute index index

Throws:

OggFormatException - if the ogg stream is corrupted

IOException - if some other IO error occurs

setTime

public void setTime(long granulePosition)
             throws IOException

Description copied from interface: PhysicalOggStream

Sets this stream's (and its logical stream's) position to the granule position. The next packet read from any logical stream will be the first packet beginning on the first page with a granule position higher than the argument.

At the moment, this method only works correctly for Ogg files with a single logical Vorbis stream, and due to the different interpretations of the granule position, depending on mixed content, this method will never be able to work for mixed streams. Chained and interleaved streams are also not yet supported. Actually, this method is only a hack to support seeking from JMF, but may of course be abused otherwise too :)

Specified by:

setTime in interface PhysicalOggStream

Throws:

OggFormatException - if the ogg stream is corrupted

IOException - if some other IO error occurs

isSeekable

public boolean isSeekable()

Specified by:

isSeekable in interface PhysicalOggStream

Returns:

true if the stream is seekable, false otherwise