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Artifact providing audio provessing functionality such as generating sine waves or writing raw audio samples to WAV files.
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// /////////////////////////////////////////////////////////////////////////////
// REFCODES.ORG
// /////////////////////////////////////////////////////////////////////////////
// This code is copyright (c) by Siegfried Steiner, Munich, Germany, distributed
// on an "AS IS" BASIS WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, and licen-
// sed under the following (see "http://en.wikipedia.org/wiki/Multi-licensing")
// licenses:
// -----------------------------------------------------------------------------
// GNU General Public License, v3.0 ("http://www.gnu.org/licenses/gpl-3.0.html")
// -----------------------------------------------------------------------------
// Apache License, v2.0 ("http://www.apache.org/licenses/TEXT-2.0")
// -----------------------------------------------------------------------------
// Please contact the copyright holding author(s) of the software artifacts in
// question for licensing issues not being covered by the above listed licenses,
// also regarding commercial licensing models or regarding the compatibility
// with other open source licenses.
// /////////////////////////////////////////////////////////////////////////////

package org.refcodes.audio;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;

import org.refcodes.numerical.NumericalUtility;

/**
 * The {@link WavSoundSampleWriter} provides means to write sound samples to a
 * WAV file. Information on the WAV file format has been taken from the
 * following article:
 * "https://web.archive.org/web/20120113025807/http://technology.niagarac.on.ca:80/courses/ctec1631/WavFileFormat.html".
 */
public class WavSoundSampleWriter extends AbstractWavSampleWriter implements SoundSampleWriter {

	// /////////////////////////////////////////////////////////////////////////
	// VARIABLES:
	// /////////////////////////////////////////////////////////////////////////

	private final SoundSampleBuilder _soundSample = new SoundSampleBuilderImpl( 0, SamplingRate.AUDIO_CD.getSamplesPerSecond() );
	private boolean _hasHeader = false;

	// /////////////////////////////////////////////////////////////////////////
	// CONSTRUCTORS:
	// /////////////////////////////////////////////////////////////////////////

	/**
	 * Constructs the {@link WavSoundSampleWriter} for writing sound samples to
	 * a WAV file or stream.
	 * 
	 * @param aFile The {@link File} where to write the CSV records to.
	 * 
	 * @throws FileNotFoundException If the given file object does not denote an
	 *         existing, writable regular file and a new regular file of that
	 *         name cannot be created, or if some other error occurs while
	 *         opening or creating the file.
	 */
	public WavSoundSampleWriter( File aFile ) throws FileNotFoundException {
		super( aFile );

	}

	/**
	 * Constructs the {@link WavSoundSampleWriter} for writing sound samples to
	 * a WAV file or stream.
	 * 
	 * @param aOutputStream The {@link OutputStream} where to write the CSV
	 *        records to.
	 */
	public WavSoundSampleWriter( OutputStream aOutputStream ) {
		super( aOutputStream );
	}

	// /////////////////////////////////////////////////////////////////////////
	// METHODS:
	// /////////////////////////////////////////////////////////////////////////

	/**
	 * {@inheritDoc}
	 */
	@Override
	public WavSoundSampleWriter withBitsPerSample( BitsPerSample aBitsPerSample ) {
		setBitsPerSample( aBitsPerSample );
		return this;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void writeNext( double... aSampleData ) throws IOException {
		if ( aSampleData == null || aSampleData.length == 0 ) {
			throw new IllegalArgumentException( "You must provide at least one sample value, bit you provided " + ( aSampleData == null ? "" : " an empty array" ) + "!" );
		}
		_soundSample.setSampleData( aSampleData );
		_soundSample.updateTimeStamp();
		writeNext( _soundSample );
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void writeNext( SoundSample aSample ) throws IOException {
		// Header |-->
		if ( !_hasHeader ) {
			synchronized ( this ) {
				if ( !_hasHeader ) {
					if ( aSample.getSamplingRate() > 0 ) {
						setSamplingRate( aSample.getSamplingRate() );
					}
					writeHeader( getSamplingRate(), aSample.getChannelCount() );
					_hasHeader = true;
				}
			}
		}
		// Header <--|
		double eSampleData;
		for ( int i = 0; i < aSample.getChannelCount(); i++ ) {
			eSampleData = aSample.getSampleData()[i];
			final byte[] eBytes = NumericalUtility.toLittleEndianBytes( toWavSample( eSampleData ), getBitsPerSample().getByteCount() );
			_outputStream.write( eBytes );
		}
		_soundSample.increaseIndex();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public int getSamplingRate() {
		return _soundSample.getSamplingRate();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void setSamplingRate( int aSamplingRate ) {
		if ( aSamplingRate != -1 && aSamplingRate != _soundSample.getSamplingRate() ) {
			_soundSample.setSamplingRate( aSamplingRate );
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public WavSoundSampleWriter withSamplingRate( int aSamplingRate ) {
		setSamplingRate( aSamplingRate );
		return this;
	}
}