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/*
 * $ProjectName$
 * $ProjectRevision$
 * -----------------------------------------------------------
 * $Id: PhysicalOggStream.java,v 1.3 2003/04/10 19:48:22 jarnbjo Exp $
 * -----------------------------------------------------------
 *
 * $Author: jarnbjo $
 *
 * Description:
 *
 * Copyright 2002-2003 Tor-Einar Jarnbjo
 * -----------------------------------------------------------
 *
 * Change History
 * -----------------------------------------------------------
 * $Log: PhysicalOggStream.java,v $
 * Revision 1.3  2003/04/10 19:48:22  jarnbjo
 * no message
 *
 * Revision 1.2  2003/03/31 00:23:04  jarnbjo
 * no message
 *
 * Revision 1.1  2003/03/03 21:02:20  jarnbjo
 * no message
 *
 */

package de.jarnbjo.ogg;

import java.io.IOException;
import java.util.Collection;

/**
 * Interface providing access to a physical Ogg stream. Typically this is
 * a file.
 */

public interface PhysicalOggStream {

   /**
    * Returns a collection of objects implementing LogicalOggStream
    * for accessing the separate logical streams within this physical Ogg stream.
    *
    * @return a collection of objects implementing LogicalOggStream
    *         which are representing the logical streams contained within this
    *         physical stream
    *
    * @see LogicalOggStream
    */

   public Collection getLogicalStreams();

   /**
    * 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.
    *
    * @param 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
    *
    * @return the Ogg page with the physical absolute index index
    *
    * @throws OggFormatException if the ogg stream is corrupted
    * @throws IOException if some other IO error occurs
    */

   public OggPage getOggPage(int index) throws OggFormatException, IOException;

   /**
    * Checks if this stream is open for reading.
    *
    * @return true if this stream is open for reading,
    *         false otherwise
    */

   public boolean isOpen();

   /**
    * Closes this stream. After invoking this method, no further access
    * to the streams data is possible.
    *
    * @throws IOException
    */

   public void close() throws IOException;

   /**
    * 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 :)
    *
    * @param granulePosition
    *
    * @throws OggFormatException if the ogg stream is corrupted
    * @throws IOException if some other IO error occurs
    */

   public void setTime(long granulePosition) throws OggFormatException, IOException;

	/**
	 *  @return true if the stream is seekable, false
	 *          otherwise
	 */

   public boolean isSeekable();
}