/*
* MpegFormatConversionProvider.
*
* JavaZOOM : mp3spi@javazoom.net
* http://www.javazoom.net
*
* ---------------------------------------------------------------------------
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* --------------------------------------------------------------------------
*/
package javazoom.spi.mpeg.sampled.convert;
import java.util.Arrays;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javazoom.spi.mpeg.sampled.file.MpegEncoding;
import org.tritonus.share.TDebug;
import org.tritonus.share.sampled.Encodings;
import org.tritonus.share.sampled.convert.TEncodingFormatConversionProvider;
/**
* ConversionProvider for MPEG files.
*/
public class MpegFormatConversionProvider extends TEncodingFormatConversionProvider
{
private static final AudioFormat.Encoding MP3 = Encodings.getEncoding("MP3");
private static final AudioFormat.Encoding PCM_SIGNED = Encodings.getEncoding("PCM_SIGNED");
private static final AudioFormat[] INPUT_FORMATS =
{
// mono
new AudioFormat(MP3, -1.0F, -1, 1, -1, -1.0F, false),
new AudioFormat(MP3, -1.0F, -1, 1, -1, -1.0F, true),
// stereo
new AudioFormat(MP3, -1.0F, -1, 2, -1, -1.0F, false),
new AudioFormat(MP3, -1.0F, -1, 2, -1, -1.0F, true),
};
private static final AudioFormat[] OUTPUT_FORMATS =
{
// mono, 16 bit signed
new AudioFormat(PCM_SIGNED, -1.0F, 16, 1, 2, -1.0F, false),
new AudioFormat(PCM_SIGNED, -1.0F, 16, 1, 2, -1.0F, true),
// stereo, 16 bit signed
new AudioFormat(PCM_SIGNED, -1.0F, 16, 2, 4, -1.0F, false),
new AudioFormat(PCM_SIGNED, -1.0F, 16, 2, 4, -1.0F, true),
};
/**
* Constructor.
*/
public MpegFormatConversionProvider()
{
super(Arrays.asList(INPUT_FORMATS), Arrays.asList(OUTPUT_FORMATS));
if (TDebug.TraceAudioConverter)
{
TDebug.out(">MpegFormatConversionProvider()");
}
}
public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream audioInputStream)
{
if (TDebug.TraceAudioConverter)
{
TDebug.out(">MpegFormatConversionProvider.getAudioInputStream(AudioFormat targetFormat, AudioInputStream audioInputStream):");
}
return new DecodedMpegAudioInputStream(targetFormat, audioInputStream);
}
/**
* Add conversion support for any MpegEncoding source with FrameRate or FrameSize not empty.
* @param targetFormat
* @param sourceFormat
* @return
*/
public boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat)
{
if (TDebug.TraceAudioConverter)
{
TDebug.out(">MpegFormatConversionProvider.isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat):");
TDebug.out("checking if conversion possible");
TDebug.out("from: " + sourceFormat);
TDebug.out("to: " + targetFormat);
}
boolean conversion = super.isConversionSupported(targetFormat, sourceFormat);
if (conversion == false)
{
AudioFormat.Encoding enc = sourceFormat.getEncoding();
if (enc instanceof MpegEncoding)
{
if ((sourceFormat.getFrameRate() != AudioSystem.NOT_SPECIFIED) || (sourceFormat.getFrameSize() != AudioSystem.NOT_SPECIFIED))
{
conversion = true;
}
}
}
return conversion;
}
}