9fee0ec4ca
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657
334 lines
9.8 KiB
Java
334 lines
9.8 KiB
Java
/*
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* DecodedMpegAudioInputStream.
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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.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.Map;
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import javax.sound.sampled.AudioFormat;
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import javax.sound.sampled.AudioInputStream;
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import javazoom.jl.decoder.Bitstream;
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import javazoom.jl.decoder.BitstreamException;
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import javazoom.jl.decoder.Decoder;
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import javazoom.jl.decoder.DecoderException;
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import javazoom.jl.decoder.Equalizer;
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import javazoom.jl.decoder.Header;
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import javazoom.jl.decoder.Obuffer;
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import javazoom.spi.PropertiesContainer;
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import javazoom.spi.mpeg.sampled.file.IcyListener;
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import javazoom.spi.mpeg.sampled.file.tag.TagParseEvent;
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import javazoom.spi.mpeg.sampled.file.tag.TagParseListener;
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import org.tritonus.share.TDebug;
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import org.tritonus.share.sampled.convert.TAsynchronousFilteredAudioInputStream;
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/**
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* Main decoder.
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*/
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public class DecodedMpegAudioInputStream extends TAsynchronousFilteredAudioInputStream implements PropertiesContainer, TagParseListener
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{
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private InputStream m_encodedStream;
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private Bitstream m_bitstream;
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private Decoder m_decoder;
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private Equalizer m_equalizer;
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private float[] m_equalizer_values;
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private Header m_header;
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private DMAISObuffer m_oBuffer;
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// Bytes info.
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private long byteslength = -1;
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private long currentByte = 0;
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// Frame info.
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private int frameslength = -1;
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private long currentFrame = 0;
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private int currentFramesize = 0;
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private int currentBitrate = -1;
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// Time info.
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private long currentMicrosecond = 0;
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// Shoutcast stream info
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private IcyListener shoutlst = null;
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private HashMap properties = null;
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public DecodedMpegAudioInputStream(AudioFormat outputFormat, AudioInputStream inputStream)
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{
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super(outputFormat, -1);
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out(">DecodedMpegAudioInputStream(AudioFormat outputFormat, AudioInputStream inputStream)");
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}
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try
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{
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// Try to find out inputstream length to allow skip.
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byteslength = inputStream.available();
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}
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catch (IOException e)
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{
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TDebug.out("DecodedMpegAudioInputStream : Cannot run inputStream.available() : "+e.getMessage());
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byteslength = -1;
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}
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m_encodedStream = inputStream;
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shoutlst = IcyListener.getInstance();
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shoutlst.reset();
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m_bitstream = new Bitstream(inputStream);
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m_decoder = new Decoder(null);
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m_equalizer = new Equalizer();
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m_equalizer_values = new float[32];
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for (int b=0;b<m_equalizer.getBandCount();b++)
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{
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m_equalizer_values[b] = m_equalizer.getBand(b);
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}
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m_decoder.setEqualizer(m_equalizer);
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m_oBuffer = new DMAISObuffer(outputFormat.getChannels());
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m_decoder.setOutputBuffer(m_oBuffer);
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try
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{
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m_header = m_bitstream.readFrame();
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if ((m_header != null) && (frameslength == -1) && (byteslength > 0)) frameslength = m_header.max_number_of_frames((int)byteslength);
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}
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catch (BitstreamException e)
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{
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TDebug.out("DecodedMpegAudioInputStream : Cannot read first frame : "+e.getMessage());
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byteslength = -1;
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}
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properties = new HashMap();
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}
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/**
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* Return dynamic properties.
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*
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* <ul>
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* <li><b>mp3.frame</b> [Long], current frame position.
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* <li><b>mp3.frame.bitrate</b> [Integer], bitrate of the current frame.
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* <li><b>mp3.frame.size.bytes</b> [Integer], size in bytes of the current frame.
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* <li><b>mp3.position.byte</b> [Long], current position in bytes in the stream.
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* <li><b>mp3.position.microseconds</b> [Long], elapsed microseconds.
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* <li><b>mp3.equalizer</b> float[32], interactive equalizer array, values could be in [-1.0, +1.0].
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* <li><b>mp3.shoutcast.metadata.key</b> [String], Shoutcast meta key with matching value.
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* <br>For instance :
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* <br>mp3.shoutcast.metadata.StreamTitle=Current song playing in stream.
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* <br>mp3.shoutcast.metadata.StreamUrl=Url info.
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* </ul>
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*/
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public Map properties()
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{
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properties.put("mp3.frame",new Long(currentFrame));
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properties.put("mp3.frame.bitrate",new Integer(currentBitrate));
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properties.put("mp3.frame.size.bytes",new Integer(currentFramesize));
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properties.put("mp3.position.byte",new Long(currentByte));
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properties.put("mp3.position.microseconds",new Long(currentMicrosecond));
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properties.put("mp3.equalizer",m_equalizer_values);
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// Optionnal shoutcast stream meta-data.
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if (shoutlst != null)
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{
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String surl = shoutlst.getStreamUrl();
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String stitle = shoutlst.getStreamTitle();
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if ((stitle != null) && (stitle.trim().length()>0)) properties.put("mp3.shoutcast.metadata.StreamTitle",stitle);
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if ((surl != null) && (surl.trim().length()>0)) properties.put("mp3.shoutcast.metadata.StreamUrl",surl);
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}
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return properties;
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}
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public void execute()
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{
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if (TDebug.TraceAudioConverter) TDebug.out("execute() : begin");
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try
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{
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// Following line hangs when FrameSize is available in AudioFormat.
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Header header = null;
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if (m_header == null) header = m_bitstream.readFrame();
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else header = m_header;
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if (TDebug.TraceAudioConverter) TDebug.out("execute() : header = "+header);
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if (header == null)
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{
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out("header is null (end of mpeg stream)");
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}
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getCircularBuffer().close();
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return;
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}
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currentFrame++;
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currentBitrate = header.bitrate_instant();
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currentFramesize = header.calculate_framesize();
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currentByte = currentByte + currentFramesize;
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currentMicrosecond = (long) (currentFrame* header.ms_per_frame()*1000.0f);
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for (int b=0;b<m_equalizer_values.length;b++)
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{
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m_equalizer.setBand(b,m_equalizer_values[b]);
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}
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m_decoder.setEqualizer(m_equalizer);
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Obuffer decoderOutput = m_decoder.decodeFrame(header, m_bitstream);
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m_bitstream.closeFrame();
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getCircularBuffer().write(m_oBuffer.getBuffer(), 0, m_oBuffer.getCurrentBufferSize());
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m_oBuffer.reset();
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if (m_header != null) m_header = null;
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}
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catch (BitstreamException e)
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{
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out(e);
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}
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}
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catch (DecoderException e)
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{
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if (TDebug.TraceAudioConverter)
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{
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TDebug.out(e);
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}
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}
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if (TDebug.TraceAudioConverter) TDebug.out("execute() : end");
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}
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public long skip(long bytes)
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{
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if ((byteslength > 0) && (frameslength > 0))
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{
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float ratio = bytes*1.0f/byteslength*1.0f;
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long bytesread = skipFrames((long) (ratio*frameslength));
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currentByte = currentByte + bytesread;
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return bytesread;
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}
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else return -1;
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}
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/**
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* Skip frames.
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* You don't need to call it severals times, it will exactly skip given frames number.
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* @param frames
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* @return bytes length skipped matching to frames skipped.
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*/
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public long skipFrames(long frames)
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{
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if (TDebug.TraceAudioConverter) TDebug.out("skip(long frames) : begin");
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int framesRead = 0;
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int bytesReads = 0;
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try
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{
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for (int i=0;i<frames;i++)
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{
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Header header = m_bitstream.readFrame();
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if (header != null)
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{
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int fsize = header.calculate_framesize();
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bytesReads = bytesReads + fsize;
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}
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m_bitstream.closeFrame();
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framesRead++;
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}
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}
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catch (BitstreamException e)
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{
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if (TDebug.TraceAudioConverter) TDebug.out(e);
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}
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if (TDebug.TraceAudioConverter) TDebug.out("skip(long frames) : end");
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currentFrame = currentFrame + framesRead;
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return bytesReads;
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}
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private boolean isBigEndian()
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{
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return getFormat().isBigEndian();
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}
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public void close() throws IOException
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{
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super.close();
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m_encodedStream.close();
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}
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private class DMAISObuffer extends Obuffer
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{
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private int m_nChannels;
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private byte[] m_abBuffer;
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private int[] m_anBufferPointers;
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private boolean m_bIsBigEndian;
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public DMAISObuffer(int nChannels)
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{
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m_nChannels = nChannels;
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m_abBuffer = new byte[OBUFFERSIZE * nChannels];
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m_anBufferPointers = new int[nChannels];
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reset();
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m_bIsBigEndian = DecodedMpegAudioInputStream.this.isBigEndian();
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}
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public void append(int nChannel, short sValue)
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{
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byte bFirstByte;
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byte bSecondByte;
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if (m_bIsBigEndian)
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{
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bFirstByte = (byte) ((sValue >>> 8) & 0xFF);
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bSecondByte = (byte) (sValue & 0xFF);
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}
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else // little endian
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{
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bFirstByte = (byte) (sValue & 0xFF);
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bSecondByte = (byte) ((sValue >>> 8) & 0xFF);
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}
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m_abBuffer[m_anBufferPointers[nChannel]] = bFirstByte;
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m_abBuffer[m_anBufferPointers[nChannel] + 1] = bSecondByte;
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m_anBufferPointers[nChannel] += m_nChannels * 2;
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}
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public void set_stop_flag()
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{
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}
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public void close()
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{
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}
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public void write_buffer(int nValue)
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{
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}
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public void clear_buffer()
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{
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}
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public byte[] getBuffer()
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{
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return m_abBuffer;
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}
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public int getCurrentBufferSize()
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{
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return m_anBufferPointers[0];
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}
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public void reset()
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{
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for (int i = 0; i < m_nChannels; i++)
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{
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/* Points to byte location,
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* implicitely assuming 16 bit
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* samples.
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*/
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m_anBufferPointers[i] = i * 2;
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}
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}
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}
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public void tagParsed(TagParseEvent tpe)
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{
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System.out.println("TAG:"+tpe.getTag());
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}
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}
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