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	/*
	* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package com.sun.media.sound;

	import java.io.ByteArrayInputStream;
	import java.io.File;
	import java.io.IOException;
	import java.io.InputStream;
	import java.net.URL;

	import javax.sound.sampled.AudioFormat;
	import javax.sound.sampled.AudioInputStream;
	import javax.sound.sampled.AudioSystem;
	import javax.sound.sampled.UnsupportedAudioFileException;

	/**
	* This class is used to create AudioFloatInputStream from AudioInputStream and
	* byte buffers.
	*
	* @author Karl Helgason
	*/
	public abstract class AudioFloatInputStream {

	private static class BytaArrayAudioFloatInputStream
	extends AudioFloatInputStream {

	private int pos = 0;
	private int markpos = 0;
	private final AudioFloatConverter converter;
	private final AudioFormat format;
	private final byte[] buffer;
	private final int buffer_offset;
	private final int buffer_len;
	private final int framesize_pc;

	BytaArrayAudioFloatInputStream(AudioFloatConverter converter,
	byte[] buffer, int offset, int len) {
	this.converter = converter;
	this.format = converter.getFormat();
	this.buffer = buffer;
	this.buffer_offset = offset;
	framesize_pc = format.getFrameSize() / format.getChannels();
	this.buffer_len = len / framesize_pc;

	}

	public AudioFormat getFormat() {
	return format;
	}

	public long getFrameLength() {
	return buffer_len;// / format.getFrameSize();
	}

	public int read(float[] b, int off, int len) throws IOException {
	if (b == null)
	throw new NullPointerException();
	if (off < 0 \|\| len < 0 \|\| len > b.length - off)
	throw new IndexOutOfBoundsException();
	if (pos >= buffer_len)
	return -1;
	if (len == 0)
	return 0;
	if (pos + len > buffer_len)
	len = buffer_len - pos;
	converter.toFloatArray(buffer, buffer_offset + pos * framesize_pc,
	b, off, len);
	pos += len;
	return len;
	}

	public long skip(long len) throws IOException {
	if (pos >= buffer_len)
	return -1;
	if (len <= 0)
	return 0;
	if (pos + len > buffer_len)
	len = buffer_len - pos;
	pos += len;
	return len;
	}

	public int available() throws IOException {
	return buffer_len - pos;
	}

	public void close() throws IOException {
	}

	public void mark(int readlimit) {
	markpos = pos;
	}

	public boolean markSupported() {
	return true;
	}

	public void reset() throws IOException {
	pos = markpos;
	}
	}

	private static class DirectAudioFloatInputStream
	extends AudioFloatInputStream {

	private final AudioInputStream stream;
	private AudioFloatConverter converter;
	private final int framesize_pc; // framesize / channels
	private byte[] buffer;

	DirectAudioFloatInputStream(AudioInputStream stream) {
	converter = AudioFloatConverter.getConverter(stream.getFormat());
	if (converter == null) {
	AudioFormat format = stream.getFormat();
	AudioFormat newformat;

	AudioFormat[] formats = AudioSystem.getTargetFormats(
	AudioFormat.Encoding.PCM_SIGNED, format);
	if (formats.length != 0) {
	newformat = formats[0];
	} else {
	float samplerate = format.getSampleRate();
	int samplesizeinbits = format.getSampleSizeInBits();
	int framesize = format.getFrameSize();
	float framerate = format.getFrameRate();
	samplesizeinbits = 16;
	framesize = format.getChannels() * (samplesizeinbits / 8);
	framerate = samplerate;

	newformat = new AudioFormat(
	AudioFormat.Encoding.PCM_SIGNED, samplerate,
	samplesizeinbits, format.getChannels(), framesize,
	framerate, false);
	}

	stream = AudioSystem.getAudioInputStream(newformat, stream);
	converter = AudioFloatConverter.getConverter(stream.getFormat());
	}
	framesize_pc = stream.getFormat().getFrameSize()
	/ stream.getFormat().getChannels();
	this.stream = stream;
	}

	public AudioFormat getFormat() {
	return stream.getFormat();
	}

	public long getFrameLength() {
	return stream.getFrameLength();
	}

	public int read(float[] b, int off, int len) throws IOException {
	int b_len = len * framesize_pc;
	if (buffer == null \|\| buffer.length < b_len)
	buffer = new byte[b_len];
	int ret = stream.read(buffer, 0, b_len);
	if (ret == -1)
	return -1;
	converter.toFloatArray(buffer, b, off, ret / framesize_pc);
	return ret / framesize_pc;
	}

	public long skip(long len) throws IOException {
	long b_len = len * framesize_pc;
	long ret = stream.skip(b_len);
	if (ret == -1)
	return -1;
	return ret / framesize_pc;
	}

	public int available() throws IOException {
	return stream.available() / framesize_pc;
	}

	public void close() throws IOException {
	stream.close();
	}

	public void mark(int readlimit) {
	stream.mark(readlimit * framesize_pc);
	}

	public boolean markSupported() {
	return stream.markSupported();
	}

	public void reset() throws IOException {
	stream.reset();
	}
	}

	public static AudioFloatInputStream getInputStream(URL url)
	throws UnsupportedAudioFileException, IOException {
	return new DirectAudioFloatInputStream(AudioSystem
	.getAudioInputStream(url));
	}

	public static AudioFloatInputStream getInputStream(File file)
	throws UnsupportedAudioFileException, IOException {
	return new DirectAudioFloatInputStream(AudioSystem
	.getAudioInputStream(file));
	}

	public static AudioFloatInputStream getInputStream(InputStream stream)
	throws UnsupportedAudioFileException, IOException {
	return new DirectAudioFloatInputStream(AudioSystem
	.getAudioInputStream(stream));
	}

	public static AudioFloatInputStream getInputStream(
	AudioInputStream stream) {
	return new DirectAudioFloatInputStream(stream);
	}

	public static AudioFloatInputStream getInputStream(AudioFormat format,
	byte[] buffer, int offset, int len) {
	AudioFloatConverter converter = AudioFloatConverter
	.getConverter(format);
	if (converter != null)
	return new BytaArrayAudioFloatInputStream(converter, buffer,
	offset, len);

	InputStream stream = new ByteArrayInputStream(buffer, offset, len);
	long aLen = format.getFrameSize() == AudioSystem.NOT_SPECIFIED
	? AudioSystem.NOT_SPECIFIED : len / format.getFrameSize();
	AudioInputStream astream = new AudioInputStream(stream, format, aLen);
	return getInputStream(astream);
	}

	public abstract AudioFormat getFormat();

	public abstract long getFrameLength();

	public abstract int read(float[] b, int off, int len) throws IOException;

	public final int read(float[] b) throws IOException {
	return read(b, 0, b.length);
	}

	public final float read() throws IOException {
	float[] b = new float[1];
	int ret = read(b, 0, 1);
	if (ret == -1 \|\| ret == 0)
	return 0;
	return b[0];
	}

	public abstract long skip(long len) throws IOException;

	public abstract int available() throws IOException;

	public abstract void close() throws IOException;

	public abstract void mark(int readlimit);

	public abstract boolean markSupported();

	public abstract void reset() throws IOException;
	}

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