JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1999, 2019, 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 javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;

/**
 * AU file format.
 *
 * @author Jan Borgersen
 */
final class AuFileFormat extends StandardFileFormat {

    // magic numbers
    static final int AU_SUN_MAGIC = 0x2e736e64; // ".snd"

    // encodings
    static final int AU_ULAW_8       = 1;  /* 8-bit ISDN u-law */
    static final int AU_LINEAR_8     = 2;  /* 8-bit linear PCM */
    static final int AU_LINEAR_16    = 3;  /* 16-bit linear PCM */
    static final int AU_LINEAR_24    = 4;  /* 24-bit linear PCM */
    static final int AU_LINEAR_32    = 5;  /* 32-bit linear PCM */
    static final int AU_FLOAT        = 6;  /* 32-bit IEEE floating point */
    static final int AU_DOUBLE       = 7;  /* 64-bit IEEE floating point */
//  we don't support these ...
//  static final int AU_ADPCM_G721   = 23; /* 4-bit CCITT g.721 ADPCM */
//  static final int AU_ADPCM_G722   = 24; /* CCITT g.722 ADPCM */
//  static final int AU_ADPCM_G723_3 = 25; /* CCITT g.723 3-bit ADPCM */
//  static final int AU_ADPCM_G723_5 = 26; /* CCITT g.723 5-bit ADPCM */
    static final int AU_ALAW_8       = 27; /* 8-bit ISDN A-law */

    static final int AU_HEADERSIZE       = 24;

    /**
     * According the specification of AU file format this is the value for
     * length field if length is not known. This is a maximum possible value for
     * the unsigned int.
     */
    static final long /*unsigned int */ UNKNOWN_SIZE = 0xffffffffL;

    private int auType;

    AuFileFormat(final AudioFileFormat.Type type, final long byteLength,
                 final AudioFormat format, final long frameLength) {
        super(type, byteLength, format, frameLength);

        AudioFormat.Encoding encoding = format.getEncoding();

        auType = -1;

        if (AudioFormat.Encoding.ALAW.equals(encoding)) {
            if (format.getSampleSizeInBits() == 8) {
                auType = AU_ALAW_8;
            }
        } else if (AudioFormat.Encoding.ULAW.equals(encoding)) {
            if (format.getSampleSizeInBits() == 8) {
                auType = AU_ULAW_8;
            }
        } else if (AudioFormat.Encoding.PCM_SIGNED.equals(encoding)) {
            if (format.getSampleSizeInBits() == 8) {
                auType = AU_LINEAR_8;
            } else if (format.getSampleSizeInBits() == 16) {
                auType = AU_LINEAR_16;
            } else if (format.getSampleSizeInBits() == 24) {
                auType = AU_LINEAR_24;

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