/*

 * Copyright (c) 1999, 2016, 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

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 */

package com.sun.media.sound;

import java.io.DataInputStream;

import java.io.IOException;

import java.io.InputStream;

import javax.sound.sampled.AudioFileFormat.Type;

import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioSystem;

import javax.sound.sampled.UnsupportedAudioFileException;

/**

 * AU file reader.

 *

 * @author Kara Kytle

 * @author Jan Borgersen

 * @author Florian Bomers

 */

public final class AuFileReader extends SunFileReader {

    @Override

            throws UnsupportedAudioFileException, IOException {

        final DataInputStream dis = new DataInputStream(stream);

        final int magic = dis.readInt();

        if (magic != AuFileFormat.AU_SUN_MAGIC) {

            // not AU, throw exception

            throw new UnsupportedAudioFileException("not an AU file");

        }

        final int headerSize = dis.readInt();

        final int auType = dis.readInt();

        final int sampleRate = dis.readInt();

        final int channels = dis.readInt();

        if (channels <= 0) {

            throw new UnsupportedAudioFileException("Invalid number of channels");

        }

        final int sampleSizeInBits;

        final AudioFormat.Encoding encoding;

        switch (auType) {

            case AuFileFormat.AU_ULAW_8:

                encoding = AudioFormat.Encoding.ULAW;

                sampleSizeInBits = 8;

                break;

            case AuFileFormat.AU_ALAW_8:

                encoding = AudioFormat.Encoding.ALAW;

                sampleSizeInBits = 8;

                break;

            case AuFileFormat.AU_LINEAR_8:

                // $$jb: 04.29.99: 8bit linear is *signed*, not *unsigned*

                encoding = AudioFormat.Encoding.PCM_SIGNED;

                sampleSizeInBits = 8;

                break;

            case AuFileFormat.AU_LINEAR_16:

                encoding = AudioFormat.Encoding.PCM_SIGNED;

                sampleSizeInBits = 16;

                break;

            case AuFileFormat.AU_LINEAR_24:

                encoding = AudioFormat.Encoding.PCM_SIGNED;

                sampleSizeInBits = 24;

                break;

            case AuFileFormat.AU_LINEAR_32:

                encoding = AudioFormat.Encoding.PCM_SIGNED;

                sampleSizeInBits = 32;

                break;

            case AuFileFormat.AU_FLOAT:

                encoding = AudioFormat.Encoding.PCM_FLOAT;

                sampleSizeInBits = 32;

                break;

            // we don't support these ...

            /*          case AuFileFormat.AU_DOUBLE:

                        encoding = new AudioFormat.DOUBLE;

                        sampleSizeInBits = 8;

                        break;

                        case AuFileFormat.AU_ADPCM_G721:

                        encoding = new AudioFormat.G721_ADPCM;

                        sampleSizeInBits = 16;

                        break;

                        case AuFileFormat.AU_ADPCM_G723_3:

                        encoding = new AudioFormat.G723_3;

                        sampleSize = 24;

                        SamplePerUnit = 8;

                        break;

                        case AuFileFormat.AU_ADPCM_G723_5:

                        encoding = new AudioFormat.G723_5;

                        sampleSize = 40;

                        SamplePerUnit = 8;

                        break;

            */

            default:

                // unsupported filetype, throw exception

                throw new UnsupportedAudioFileException("not a valid AU file");

        }

        final int frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);

        //$$fb 2002-11-02: fix for 4629669: AU file reader: problems with empty files

        }

        final AudioFormat format = new AudioFormat(encoding, sampleRate,

                                                   sampleSizeInBits, channels,

                                                   frameSize, sampleRate, true);

    }

}