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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package com.sun.media.sound;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

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



AIFF file reader and writer.

Author:Kara Kytle, Jan Borgersen, Florian Bomers
/**
 * AIFF file reader and writer.
 *
 * @author Kara Kytle
 * @author Jan Borgersen
 * @author Florian Bomers
 */
public final class AiffFileReader extends SunFileReader {

    private static final int MAX_READ_LENGTH = 8;

    
Constructs a new AiffParser object.

/**
     * Constructs a new AiffParser object.
     */
    public AiffFileReader() {
    }




    // METHODS TO IMPLEMENT AudioFileReader

    
Obtains the audio file format of the input stream provided.  The stream must
point to valid audio file data.  In general, audio file providers may
need to read some data from the stream before determining whether they
support it.  These parsers must
be able to mark the stream, read enough data to determine whether they
support the stream, and, if not, reset the stream's read pointer to its original
position.  If the input stream does not support this, this method may fail
with an IOException.

Params:
  • stream – the input stream from which file format information should be
extracted
Throws:
See Also:
Returns:an AudioFileFormat object describing the audio file format
/**
     * Obtains the audio file format of the input stream provided.  The stream must
     * point to valid audio file data.  In general, audio file providers may
     * need to read some data from the stream before determining whether they
     * support it.  These parsers must
     * be able to mark the stream, read enough data to determine whether they
     * support the stream, and, if not, reset the stream's read pointer to its original
     * position.  If the input stream does not support this, this method may fail
     * with an IOException.
     * @param stream the input stream from which file format information should be
     * extracted
     * @return an <code>AudioFileFormat</code> object describing the audio file format
     * @throws UnsupportedAudioFileException if the stream does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     * @see InputStream#markSupported
     * @see InputStream#mark
     */
    public AudioFileFormat getAudioFileFormat(InputStream stream) throws UnsupportedAudioFileException, IOException {
        // fix for 4489272: AudioSystem.getAudioFileFormat() fails for InputStream, but works for URL
        AudioFileFormat aff = getCOMM(stream, true);
        // the following is not strictly necessary - but was implemented like that in 1.3.0 - 1.4.1
        // so I leave it as it was. May remove this for 1.5.0
        stream.reset();
        return aff;
    }


    
Obtains the audio file format of the URL provided.  The URL must
point to valid audio file data.

Params:
  • url – the URL from which file format information should be
extracted
Throws:
Returns:an AudioFileFormat object describing the audio file format
/**
     * Obtains the audio file format of the URL provided.  The URL must
     * point to valid audio file data.
     * @param url the URL from which file format information should be
     * extracted
     * @return an <code>AudioFileFormat</code> object describing the audio file format
     * @throws UnsupportedAudioFileException if the URL does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     */
    public AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException {
        AudioFileFormat fileFormat = null;
        InputStream urlStream = url.openStream();       // throws IOException
        try {
            fileFormat = getCOMM(urlStream, false);
        } finally {
            urlStream.close();
        }
        return fileFormat;
    }


    
Obtains the audio file format of the File provided.  The File must
point to valid audio file data.

Params:
  • file – the File from which file format information should be
extracted
Throws:
Returns:an AudioFileFormat object describing the audio file format
/**
     * Obtains the audio file format of the File provided.  The File must
     * point to valid audio file data.
     * @param file the File from which file format information should be
     * extracted
     * @return an <code>AudioFileFormat</code> object describing the audio file format
     * @throws UnsupportedAudioFileException if the File does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     */
    public AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException {
        AudioFileFormat fileFormat = null;
        FileInputStream fis = new FileInputStream(file);       // throws IOException
        // part of fix for 4325421
        try {
            fileFormat = getCOMM(fis, false);
        } finally {
            fis.close();
        }

        return fileFormat;
    }




    
Obtains an audio stream from the input stream provided.  The stream must
point to valid audio file data.  In general, audio file providers may
need to read some data from the stream before determining whether they
support it.  These parsers must
be able to mark the stream, read enough data to determine whether they
support the stream, and, if not, reset the stream's read pointer to its original
position.  If the input stream does not support this, this method may fail
with an IOException.

Params:
  • stream – the input stream from which the AudioInputStream should be
constructed
Throws:
See Also:
Returns:an AudioInputStream object based on the audio file data contained
in the input stream.
/**
     * Obtains an audio stream from the input stream provided.  The stream must
     * point to valid audio file data.  In general, audio file providers may
     * need to read some data from the stream before determining whether they
     * support it.  These parsers must
     * be able to mark the stream, read enough data to determine whether they
     * support the stream, and, if not, reset the stream's read pointer to its original
     * position.  If the input stream does not support this, this method may fail
     * with an IOException.
     * @param stream the input stream from which the <code>AudioInputStream</code> should be
     * constructed
     * @return an <code>AudioInputStream</code> object based on the audio file data contained
     * in the input stream.
     * @throws UnsupportedAudioFileException if the stream does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     * @see InputStream#markSupported
     * @see InputStream#mark
     */
    public AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException {
        // getCOMM leaves the input stream at the beginning of the audio data
        AudioFileFormat fileFormat = getCOMM(stream, true);     // throws UnsupportedAudioFileException, IOException

        // we've got everything, and the stream is at the
        // beginning of the audio data, so return an AudioInputStream.
        return new AudioInputStream(stream, fileFormat.getFormat(), fileFormat.getFrameLength());
    }


    
Obtains an audio stream from the URL provided.  The URL must
point to valid audio file data.

Params:
  • url – the URL for which the AudioInputStream should be
constructed
Throws:
Returns:an AudioInputStream object based on the audio file data pointed
to by the URL
/**
     * Obtains an audio stream from the URL provided.  The URL must
     * point to valid audio file data.
     * @param url the URL for which the <code>AudioInputStream</code> should be
     * constructed
     * @return an <code>AudioInputStream</code> object based on the audio file data pointed
     * to by the URL
     * @throws UnsupportedAudioFileException if the URL does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     */
    public AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException {
        InputStream urlStream = url.openStream();  // throws IOException
        AudioFileFormat fileFormat = null;
        try {
            fileFormat = getCOMM(urlStream, false);
        } finally {
            if (fileFormat == null) {
                urlStream.close();
            }
        }
        return new AudioInputStream(urlStream, fileFormat.getFormat(), fileFormat.getFrameLength());
    }


    
Obtains an audio stream from the File provided.  The File must
point to valid audio file data.

Params:
  • file – the File for which the AudioInputStream should be
constructed
Throws:
Returns:an AudioInputStream object based on the audio file data pointed
to by the File
/**
     * Obtains an audio stream from the File provided.  The File must
     * point to valid audio file data.
     * @param file the File for which the <code>AudioInputStream</code> should be
     * constructed
     * @return an <code>AudioInputStream</code> object based on the audio file data pointed
     * to by the File
     * @throws UnsupportedAudioFileException if the File does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     */
    public AudioInputStream getAudioInputStream(File file)
        throws UnsupportedAudioFileException, IOException {

        FileInputStream fis = new FileInputStream(file); // throws IOException
        AudioFileFormat fileFormat = null;
        // part of fix for 4325421
        try {
            fileFormat = getCOMM(fis, false);
        } finally {
            if (fileFormat == null) {
                fis.close();
            }
        }
        return new AudioInputStream(fis, fileFormat.getFormat(), fileFormat.getFrameLength());
    }

    //--------------------------------------------------------------------

    private AudioFileFormat getCOMM(InputStream is, boolean doReset)
        throws UnsupportedAudioFileException, IOException {

        DataInputStream dis = new DataInputStream(is);

        if (doReset) {
            dis.mark(MAX_READ_LENGTH);
        }

        // assumes a stream at the beginning of the file which has already
        // passed the magic number test...
        // leaves the input stream at the beginning of the audio data
        int fileRead = 0;
        int dataLength = 0;
        AudioFormat format = null;

        // Read the magic number
        int magic = dis.readInt();

        // $$fb: fix for 4369044: javax.sound.sampled.AudioSystem.getAudioInputStream() works wrong with Cp037
        if (magic != AiffFileFormat.AIFF_MAGIC) {
            // not AIFF, throw exception
            if (doReset) {
                dis.reset();
            }
            throw new UnsupportedAudioFileException("not an AIFF file");
        }

        int length = dis.readInt();
        int iffType = dis.readInt();
        fileRead += 12;

        int totallength;
        if(length <= 0 ) {
            length = AudioSystem.NOT_SPECIFIED;
            totallength = AudioSystem.NOT_SPECIFIED;
        } else {
            totallength = length + 8;
        }

        // Is this an AIFC or just plain AIFF file.
        boolean aifc = false;
        // $$fb: fix for 4369044: javax.sound.sampled.AudioSystem.getAudioInputStream() works wrong with Cp037
        if (iffType ==  AiffFileFormat.AIFC_MAGIC) {
            aifc = true;
        }

        // Loop through the AIFF chunks until
        // we get to the SSND chunk.
        boolean ssndFound = false;
        while (!ssndFound) {
            // Read the chunk name
            int chunkName = dis.readInt();
            int chunkLen = dis.readInt();
            fileRead += 8;

            int chunkRead = 0;

            // Switch on the chunk name.
            switch (chunkName) {
            case AiffFileFormat.FVER_MAGIC:
                // Ignore format version for now.
                break;

            case AiffFileFormat.COMM_MAGIC:
                // AIFF vs. AIFC
                // $$fb: fix for 4399551: Repost of bug candidate: cannot replay aif file (Review ID: 108108)
                if ((!aifc && chunkLen < 18) || (aifc && chunkLen < 22)) {
                    throw new UnsupportedAudioFileException("Invalid AIFF/COMM chunksize");
                }
                // Read header info.
                int channels = dis.readShort();
                dis.readInt();
                int sampleSizeInBits = dis.readShort();
                float sampleRate = (float) read_ieee_extended(dis);
                chunkRead += (2 + 4 + 2 + 10);

                // If this is not AIFC then we assume it's
                // a linearly encoded file.
                AudioFormat.Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;

                if (aifc) {
                    int enc = dis.readInt(); chunkRead += 4;
                    switch (enc) {
                    case AiffFileFormat.AIFC_PCM:
                        encoding = AudioFormat.Encoding.PCM_SIGNED;
                        break;
                    case AiffFileFormat.AIFC_ULAW:
                        encoding = AudioFormat.Encoding.ULAW;
                        sampleSizeInBits = 8; // Java Sound convention
                        break;
                    default:
                        throw new UnsupportedAudioFileException("Invalid AIFF encoding");
                    }
                }
                int frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);
                //$fb what's that ??
                //if (sampleSizeInBits == 8) {
                //    encoding = AudioFormat.Encoding.PCM_SIGNED;
                //}
                format =  new AudioFormat(encoding, sampleRate,
                                          sampleSizeInBits, channels,
                                          frameSize, sampleRate, true);
                break;
            case AiffFileFormat.SSND_MAGIC:
                // Data chunk.
                // we are getting *weird* numbers for chunkLen sometimes;
                // this really should be the size of the data chunk....
                int dataOffset = dis.readInt();
                int blocksize = dis.readInt();
                chunkRead += 8;

                // okay, now we are done reading the header.  we need to set the size
                // of the data segment.  we know that sometimes the value we get for
                // the chunksize is absurd.  this is the best i can think of:if the
                // value seems okay, use it.  otherwise, we get our value of
                // length by assuming that everything left is the data segment;
                // its length should be our original length (for all AIFF data chunks)
                // minus what we've read so far.
                // $$kk: we should be able to get length for the data chunk right after
                // we find "SSND."  however, some aiff files give *weird* numbers.  what
                // is going on??

                if (chunkLen < length) {
                    dataLength = chunkLen - chunkRead;
                } else {
                    // $$kk: 11.03.98: this seems dangerous!
                    dataLength = length - (fileRead + chunkRead);
                }
                ssndFound = true;
                break;
            } // switch
            fileRead += chunkRead;
            // skip the remainder of this chunk
            if (!ssndFound) {
                int toSkip = chunkLen - chunkRead;
                if (toSkip > 0) {
                    fileRead += dis.skipBytes(toSkip);
                }
            }
        } // while

        if (format == null) {
            throw new UnsupportedAudioFileException("missing COMM chunk");
        }
        AudioFileFormat.Type type = aifc?AudioFileFormat.Type.AIFC:AudioFileFormat.Type.AIFF;

        return new AiffFileFormat(type, totallength, format, dataLength / format.getFrameSize());
    }

    // HELPER METHODS
    
write_ieee_extended(DataOutputStream dos, double f) throws IOException {
Extended precision IEEE floating-point conversion routine.

Throws:
@argumentDataOutputStream
@argumentdouble
Returns:void
/** write_ieee_extended(DataOutputStream dos, double f) throws IOException {
     * Extended precision IEEE floating-point conversion routine.
     * @argument DataOutputStream
     * @argument double
     * @return void
     * @exception IOException
     */
    private void write_ieee_extended(DataOutputStream dos, double f) throws IOException {

        int exponent = 16398;
        double highMantissa = f;

        // For now write the integer portion of f
        // $$jb: 03.30.99: stay in synch with JMF on this!!!!
        while (highMantissa < 44000) {
            highMantissa *= 2;
            exponent--;
        }
        dos.writeShort(exponent);
        dos.writeInt( ((int) highMantissa) << 16);
        dos.writeInt(0); // low Mantissa
    }


    
read_ieee_extended
Extended precision IEEE floating-point conversion routine.

Throws:
@argumentDataInputStream
Returns:double
/**
     * read_ieee_extended
     * Extended precision IEEE floating-point conversion routine.
     * @argument DataInputStream
     * @return double
     * @exception IOException
     */
    private double read_ieee_extended(DataInputStream dis) throws IOException {

        double f = 0;
        int expon = 0;
        long hiMant = 0, loMant = 0;
        long t1, t2;
        double HUGE = ((double)3.40282346638528860e+38);


        expon = dis.readUnsignedShort();

        t1 = (long)dis.readUnsignedShort();
        t2 = (long)dis.readUnsignedShort();
        hiMant = t1 << 16 | t2;

        t1 = (long)dis.readUnsignedShort();
        t2 = (long)dis.readUnsignedShort();
        loMant = t1 << 16 | t2;

        if (expon == 0 && hiMant == 0 && loMant == 0) {
            f = 0;
        } else {
            if (expon == 0x7FFF)
                f = HUGE;
            else {
                expon -= 16383;
                expon -= 31;
                f = (hiMant * Math.pow(2, expon));
                expon -= 32;
                f += (loMant * Math.pow(2, expon));
            }
        }

        return f;
    }



}