AudioInputStream.java

/*
 * Copyright (c) 2013, Slick2D
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of the Slick2D nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.newdawn.slick.openal;

import java.io.IOException;

/**
 * The description of an input stream that supplied audio data suitable for
 * use in OpenAL buffers
 *
 * @author kevin
 */
interface AudioInputStream {
	/**
	 * Get the number of channels used by the audio 
	 * 
	 * @return The number of channels used by the audio
	 */
	public int getChannels();
	
	/**
	 * The play back rate described in the underling audio file
	 * 
	 * @return The playback rate 
	 */
	public int getRate();

	/**
	 * Read a single byte from the stream
	 * 
	 * @return The single byte read
	 * @throws IOException Indicates a failure to read the underlying media
	 * @see java.io.InputStream#read()
	 */
	public int read() throws IOException;

	/**
	 * Read up to data.length bytes from the stream
	 * 
	 * @param data The array to read into
	 * @return The number of bytes read or -1 to indicate no more bytes are available
	 * @throws IOException Indicates a failure to read the underlying media
	 * @see java.io.InputStream#read(byte[])
	 */
	public int read(byte[] data) throws IOException;

	/**
	 * Read up to len bytes from the stream
	 * 
	 * @param data The array to read into
	 * @param ofs The offset into the array at which to start writing
	 * @param len The maximum number of bytes to read
	 * @return The number of bytes read or -1 to indicate no more bytes are available
	 * @throws IOException Indicates a failure to read the underlying media
	 * @see java.io.InputStream#read(byte[], int, int)
	 */
	public int read(byte[] data, int ofs, int len) throws IOException;

	/**
	 * Check if the stream is at the end, i.e. end of file or URL 
	 * 
	 * @return True if the stream has no more data available
	 */
	public boolean atEnd();
	
	/**
	 * Close the stream
	 * 
	 * @see java.io.InputStream#close()
	 * @throws IOException Indicates a failure to access the resource
	 */
	public void close() throws IOException;

	/**
	 * Skips over and discards n bytes of data from this input stream.
	 * 
	 * @param n the number of bytes to be skipped.
	 * @return the actual number of bytes skipped.
	 * @throws IOException
	 * @see java.io.InputStream#skip(long)
	 */
	public long skip(long n) throws IOException;
}