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