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Semester 1/Programming 1/Java/examples/projects/JLayer1.0.1/README.txt
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Semester 1/Programming 1/Java/examples/projects/JLayer1.0.1/README.txt
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JLayer 1.0.1
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JavaZOOM 1999-2008
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Project Homepage :
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http://www.javazoom.net/javalayer/javalayer.html
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JAVA and MP3 online Forums :
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http://www.javazoom.net/services/forums/index.jsp
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-----------------------------------------------------
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DESCRIPTION :
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-----------
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JLayer is a library that decodes/plays/converts MPEG 1/2/2.5 Layer 1/2/3
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(i.e. MP3) in real time for the JAVA(tm) platform. This is a non-commercial project
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and anyone can add his contribution. JLayer is licensed under LGPL (see LICENSE.txt).
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FAQ :
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---
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- How to install JLayer ?
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Before running JLayer you must set PATH and CLASSPATH for JAVA
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and you must add jl1.0.1.jar to the CLASSPATH.
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- Do I need JMF to run JLayer player ?
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No, JMF is not required. You just need a JVM JavaSound 1.0 compliant.
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(i.e. JVM1.3 or higher).
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- How to run the MP3TOWAV converter ?
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java javazoom.jl.converter.jlc -v -p output.wav yourfile.mp3
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(Note : MP3TOWAV converter should work under jdk1.1.x or higher)
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- How to run the simple MP3 player ?
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java javazoom.jl.player.jlp localfile.mp3
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or
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java javazoom.jl.player.jlp -url http://www.aserver.com/remotefile.mp3
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Note : MP3 simple player only works under JVM that supports JavaSound 1.0 (i.e JDK1.3.x+)
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- How to run the advanced (threaded) MP3 player ?
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java javazoom.jl.player.advanced.jlap localfile.mp3
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- Does simple MP3 player support streaming ?
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Yes, use the following command to play music from stream :
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java javazoom.jl.player.jlp -url http://www.shoutcastserver.com:8000
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(If JLayer returns without playing SHOUTcast stream then it might mean
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that the server expect a winamp like "User-Agent" in HTTP request).
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- Does JLayer support MPEG 2.5 ?
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Yes, it works fine for all files generated with LAME.
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- Does JLayer support VBR ?
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Yes, It supports VBRI and XING VBR header too.
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- How to get ID3v1 or ID3v2 tags from JLayer API ?
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The API provides a getRawID3v2() method to get an InputStream on ID3v2 frames.
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- How to skip frames to have a seek feature ?
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See javazoom.jl.player.advanced.jlap source to learn how to skip frames.
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- How much memory/CPU JLayer needs to run ?
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Here are our benchmark notes :
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- Heap use range : 1380KB to 1900KB - 370 classes loaded.
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- Footprint : ~8MB under WinNT4/Win2K + J2SE 1.3 (Hotspot).
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~10MB under WinNT4/Win2K + J2SE 1.4.1 (Hotspot).
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- CPU usage : ~12% under PIII 800Mhz/WinNT4+J2SE 1.3 (Hotspot).
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~8% under PIII 1Ghz/Win2K+J2SE 1.3.1 (Hotspot).
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~12% under PIII 1Ghz/Win2K+J2SE 1.4.1 (Hotspot).
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~1% under PIII 1Ghz/Win2K+J2SE 1.5.0 (Hotspot).
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- How to contact JLayer developers ?
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Try to post a thread on Java&MP3 online forums at :
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http://www.javazoom.net/services/forums/index.jsp
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You can also contact us at jlayer@javazoom.net for contributions.
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KNOWN PROBLEMS :
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--------------
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99% of MP3 plays well with JLayer but some (1%) return an ArrayIndexOutOfBoundsException
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while playing. It might come from invalid audio frames.
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Workaround : Just try/catch ArrayIndexOutOfBoundsException in your code to skip
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non-detected invalid frames.
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