9fee0ec4ca
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657
120 lines
3.9 KiB
Java
120 lines
3.9 KiB
Java
/*
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* MpegFormatConversionProvider.
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*
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* JavaZOOM : mp3spi@javazoom.net
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* http://www.javazoom.net
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*
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* ---------------------------------------------------------------------------
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* --------------------------------------------------------------------------
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*/
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package javazoom.spi.mpeg.sampled.convert;
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import java.util.Arrays;
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import javax.sound.sampled.AudioFormat;
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import javax.sound.sampled.AudioInputStream;
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import javax.sound.sampled.AudioSystem;
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import javazoom.spi.mpeg.sampled.file.MpegEncoding;
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import org.tritonus.share.TDebug;
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import org.tritonus.share.sampled.Encodings;
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import org.tritonus.share.sampled.convert.TEncodingFormatConversionProvider;
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/**
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* ConversionProvider for MPEG files.
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*/
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public class MpegFormatConversionProvider extends TEncodingFormatConversionProvider
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{
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private static final AudioFormat.Encoding MP3 = Encodings.getEncoding("MP3");
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private static final AudioFormat.Encoding PCM_SIGNED = Encodings.getEncoding("PCM_SIGNED");
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private static final AudioFormat[] INPUT_FORMATS =
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{
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// mono
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new AudioFormat(MP3, -1.0F, -1, 1, -1, -1.0F, false),
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new AudioFormat(MP3, -1.0F, -1, 1, -1, -1.0F, true),
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// stereo
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new AudioFormat(MP3, -1.0F, -1, 2, -1, -1.0F, false),
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new AudioFormat(MP3, -1.0F, -1, 2, -1, -1.0F, true),
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};
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private static final AudioFormat[] OUTPUT_FORMATS =
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{
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// mono, 16 bit signed
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new AudioFormat(PCM_SIGNED, -1.0F, 16, 1, 2, -1.0F, false),
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new AudioFormat(PCM_SIGNED, -1.0F, 16, 1, 2, -1.0F, true),
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// stereo, 16 bit signed
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new AudioFormat(PCM_SIGNED, -1.0F, 16, 2, 4, -1.0F, false),
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new AudioFormat(PCM_SIGNED, -1.0F, 16, 2, 4, -1.0F, true),
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};
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/**
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* Constructor.
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*/
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public MpegFormatConversionProvider()
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{
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super(Arrays.asList(INPUT_FORMATS), Arrays.asList(OUTPUT_FORMATS));
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out(">MpegFormatConversionProvider()");
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}
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}
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public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream audioInputStream)
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{
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out(">MpegFormatConversionProvider.getAudioInputStream(AudioFormat targetFormat, AudioInputStream audioInputStream):");
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}
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return new DecodedMpegAudioInputStream(targetFormat, audioInputStream);
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}
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/**
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* Add conversion support for any MpegEncoding source with FrameRate or FrameSize not empty.
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* @param targetFormat
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* @param sourceFormat
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* @return
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*/
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public boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat)
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{
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out(">MpegFormatConversionProvider.isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat):");
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TDebug.out("checking if conversion possible");
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TDebug.out("from: " + sourceFormat);
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TDebug.out("to: " + targetFormat);
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}
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boolean conversion = super.isConversionSupported(targetFormat, sourceFormat);
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if (conversion == false)
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{
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AudioFormat.Encoding enc = sourceFormat.getEncoding();
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if (enc instanceof MpegEncoding)
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{
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if ((sourceFormat.getFrameRate() != AudioSystem.NOT_SPECIFIED) || (sourceFormat.getFrameSize() != AudioSystem.NOT_SPECIFIED))
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{
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conversion = true;
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}
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}
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}
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return conversion;
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}
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}
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