Examples of ptolemy.media.javasound.SoundReader

ptolemy.media.javasound.SoundReader
This class is a buffer that supports the reading of audio samples from a sound file that is specified as a URL. Specifically, this buffer supports the reading of double-valued audio samples. The maximum valid range of sample values is from -1.0 to 1.0. Any values outside of this range will be hard-clipped to fall within this range.
Supported file types
Valid sound file formats are WAVE (.wav), AIFF (.aif, .aiff), AU (.au). Valid sample rates are 8000, 11025, 22050, 44100, and 48000 Hz. Both 8 bit and 16 bit audio are supported. Mono and stereo files are supported.
Usage
The path to the sound file, specified as a URL, is given as a constructor parameter. The constructor also takes an array length parameter, which is explained below. The constructor will attempt to open the specified file.
After invoking the constructor, the getSamples() method should be repeatedly invoked to read samples from the specified sound file. The getSamples() method takes a multidimensional array as a parameter. The first index represents the channel number (0 for first channel, 1 for second channel, etc.). The second index represents the sample index within a channel. For each channel i, the size of the array, getSamplesArray[i].length, must be equal to the constructor parameter getSamplesArraySize. Otherwise an exception will occur. When the end of the sound file is reached, this method will return null.
The getChannels(), getSampleRate(), and getBitsPerSample() methods may be invoked at any time to obtain information about the format of the sound file.
When no more samples are desired, the closeFile() method should be invoked to close the sound file. An exception will occur if getSamples() is invoked at any point after closeFile() is invoked.
Security Issues
Applications have no restrictions on the capturing or playback of audio. Applets, however, may by default only capture audio from a file specified as a URL on the same machine as the one the applet was loaded from. Applet code is not allowed to read or write native files. The .java.policy file may be modified to grant applets more privileges.
Note: Requires Java 2 v1.3.0 or later. @author Brian K. Vogel @version $Id: SoundReader.java,v 1.30 2006/03/30 16:34:53 cxh Exp $ @since Ptolemy II 1.0 @Pt.ProposedRating Red (vogel) @Pt.AcceptedRating Red (cxh) @see ptolemy.media.javasound.SoundWriter


        // Each read this many samples per channel when
        // _soundReader.getSamples() is called.
        // This value was chosen somewhat arbitrarily.
        int getSamplesArraySize = 1;
        _soundReader = new SoundReader(theURL, getSamplesArraySize);


        // Read the number of audio channels and set
        // parameter accordingly.
        //_channels = _soundReader.getChannels();

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            // _soundReader.getSamples() is called.
            // This value was chosen arbitrarily.
            int getSamplesArraySize = 64;


            try {
                _soundReader = new SoundReader(fileOrURL.asURL(),
                        getSamplesArraySize);
            } catch (IOException ex) {
                String newFileOrURL = ((StringToken) fileOrURL.getToken())
                        .stringValue();
                throw new IllegalActionException(this, ex,

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        int getSamplesSize = 256;


        try {
            // Construct a SoundReader object that is used to read
            // sound samples from an audio file.
            SoundReader soundReader = new SoundReader(sourceURL, getSamplesSize);


            // The sample rate to playback at, in Hz.
            // Set the playback sample rate to the sample rate of the
            // input sound file.
            float sampleRate = soundReader.getSampleRate();


            if (_debug) {
                System.out.println("Sample rate of the input file is "
                        + sampleRate + " Hz.");
            }


            // Number of bits per sample.
            int bitsPerSample = soundReader.getBitsPerSample();


            if (_debug) {
                System.out.println("Bits per sample for the input file is "
                        + bitsPerSample);
            }


            // 1 for mono, 2 for stereo, etc.
            int channels = soundReader.getChannels();


            if (_debug) {
                System.out.println("Number of channels for the input file is "
                        + channels);
            }


            int putSamplesSize = getSamplesSize;


            // Construct a sound writer object that is used to write
            // audio samples to a sound file.
            SoundWriter soundWriter = new SoundWriter(writeFile, sampleRate,
                    bitsPerSample, channels, putSamplesSize);


            double[][] capturedSamplesArray = new double[channels][getSamplesSize];
            boolean done = false;


            // The main loop.
            while (!done) {
                // Read in some audio samples.
                capturedSamplesArray = soundReader.getSamples();


                if (_debug) {
                    System.out.println("Read some samples...");
                }


                if (capturedSamplesArray == null) {
                    // reached end of file.
                    done = true;
                    System.out.println("Reached end of file.");
                } else {
                    // Do some simple processing on the
                    // captured audio.
                    for (int j = 0; j < channels; j++) {
                        for (int i = 0; i < getSamplesSize; i++) {
                            //  ********** INSERT PROCESSING CODE HERE ****
                            // Perform soft clipping using the arc tangent.
                            capturedSamplesArray[j][i] = java.lang.Math
                                    .atan(capturedSamplesArray[j][i]) * 0.6;
                        }
                    }


                    // Write the processed audio samples.
                    soundWriter.putSamples(capturedSamplesArray);
                }
            }


            // Close the input sound file, because we are done with it.
            soundReader.closeFile();


            // Close the output sound file, because we are done with it.
            soundWriter.closeFile();
        } catch (Exception ex) {
            System.err.println(ex);

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