/*

 * 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

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 */

package com.sun.media.sound;

import java.util.Arrays;

import javax.sound.sampled.AudioFormat;

/**

 * This class is used to store audio buffer.

 *

 * @author Karl Helgason

 */

public final class SoftAudioBuffer {

    private int size;

    private float[] buffer;

    private boolean empty = true;

    private AudioFormat format;

    private AudioFloatConverter converter;

    private byte[] converter_buffer;

    public SoftAudioBuffer(int size, AudioFormat format) {

        this.size = size;

        this.format = format;

        converter = AudioFloatConverter.getConverter(format);

    }

    public void swap(SoftAudioBuffer swap)

    {

        int bak_size = size;

        float[] bak_buffer = buffer;

        boolean bak_empty = empty;

        AudioFormat bak_format = format;

        AudioFloatConverter bak_converter = converter;

        byte[] bak_converter_buffer = converter_buffer;

        size = swap.size;

        buffer = swap.buffer;

        empty = swap.empty;

        format = swap.format;

        converter = swap.converter;

        converter_buffer = swap.converter_buffer;

        swap.size = bak_size;

        swap.buffer = bak_buffer;

        swap.empty = bak_empty;

        swap.format = bak_format;

        swap.converter = bak_converter;

        swap.converter_buffer = bak_converter_buffer;

    }

    public AudioFormat getFormat() {

        return format;

    }

    public int getSize() {

        return size;

    }

    public void clear() {

        if (!empty) {

            Arrays.fill(buffer, 0);

            empty = true;

        }

    }

    public boolean isSilent() {

        return empty;

    }

    public float[] array() {

        empty = false;

        if (buffer == null)

            buffer = new float[size];

        return buffer;

    }

    public void get(byte[] buffer, int channel) {

        int framesize_pc = (format.getFrameSize() / format.getChannels());

        int c_len = size * framesize_pc;

        if (converter_buffer == null || converter_buffer.length < c_len)

            converter_buffer = new byte[c_len];

        if (format.getChannels() == 1) {

            converter.toByteArray(array(), size, buffer);

        } else {

            converter.toByteArray(array(), size, converter_buffer);

            if (channel >= format.getChannels())

                return;

            int z_stepover = format.getChannels() * framesize_pc;

            int k_stepover = framesize_pc;

            for (int j = 0; j < framesize_pc; j++) {

                int k = j;

                int z = channel * framesize_pc + j;

                for (int i = 0; i < size; i++) {

                    buffer[z] = converter_buffer[k];

                    z += z_stepover;

                    k += k_stepover;

                }

            }

        }

    }

}