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Jun 4, 2008 11:42pm
Img_missing_medium scott2345 11 posts

Hi,

I would like to use some of the JLayer 1.0 packages for audio decoding and playback in the BUG (For the new audio module). At first I tried to just import these packages into my BUG App, then realized I probably have to export them as OSGi bundles. The only problem is that I am unable to edit the JLayer .jar manifest file in order to export the packages. I am fairly new to the whole OSGi stuff, so please feel free to deeply elaborate on any responses.

Thanks.

Jun 11, 2008 3:39pm
Medium Bug Labs team jconnolly 285 posts

scott2345
Hi,

I would like to use some of the JLayer 1.0 packages for audio decoding and playback in the BUG (For the new audio module). At first I tried to just import these packages into my BUG App, then realized I probably have to export them as OSGi bundles. The only problem is that I am unable to edit the JLayer .jar manifest file in order to export the packages. I am fairly new to the whole OSGi stuff, so please feel free to deeply elaborate on any responses.

Thanks.


Hiya Scott,

I would take a look at either FlickrUppr or MotherBUGTweetNTwitch for examples of how to use an external jar lib in your App bundle.

I'm not sure about JLayer in particular, but using external jars, you don't need to export the jars as bundles. To access them, merely place them into the BundleClasspath by modifying your Applications Manifest to look something like:

Bundle-ClassPath: .,jars/JLayer.jar.

Where JLayer is physically located in a jars folder in your project. You can get the jar into your project by right-clicking on the project and selecting "Import->File-System->(Navigate to Directory)". I select the "Create complete folder structure" otherwise eclipse does some funky stuff to the structure and the file just hangs out in the top level of your project hierarchy. :roll:

Let me know if this works for you.
Jun 12, 2008 3:22pm
Img_missing_medium scott2345 11 posts

Worked like a charm John.

Is there a way that the virtual bug can play audio via my computer? This would be very handy for debugging my app.

-Scott

Jun 12, 2008 3:49pm
Medium Bug Labs team jconnolly 285 posts

Scott, glad it worked for you.
As far as audio goes, it depends on what you’re trying to do, the platform you’re on, and the audio format you’re using. Let me know your OS and what you’re trying to play.

PhoneME has API support for Audio. Linux has command-line audio support, so it should be possible to hack it with a Runtime.getRuntime().exec("alsa…...") if you have alsa installed.

I’m working to get audio support on the physical BUG. The hardware supports full audio output, including wav and mp3.

Jun 12, 2008 6:35pm
Img_missing_medium scott2345 11 posts

Hi John,

I am basically trying to play an MP3 using JLayer on the bug. JLayerME uses the J2ME JVM for realtime decoding of mp3’s, and provides a fairly nice API.

Currently I am running Windows Vista, and have no idea how to snag any audio resources. :)

Jun 13, 2008 9:07am
Medium Bug Labs team jconnolly 285 posts

Sounds interesting, I’m going to take a look and see what I can do with the JLayer libraries and get back to you.

Jun 22, 2008 2:32pm
Img_missing_medium scott2345 11 posts

I got this working, if anyone has any questions about this topic.

Jun 23, 2008 8:15am
Medium Bug Labs team jconnolly 285 posts

scott2345
I got this working, if anyone has any questions about this topic.


Hiya Scott,

Sounds cool. Did you create a BUG application that uses JLayer? I'd love to see it.
Jun 23, 2008 3:17pm
Img_missing_medium scott2345 11 posts

It will be out in a couple weeks or so, I still need to do some multi-threading and GUI work.

Jun 23, 2008 3:24pm
Medium Bug Labs team jconnolly 285 posts

scott2345
It will be out in a couple weeks or so, I still need to do some multi-threading and GUI work.


awesome. let me know if I can be of any help... and drop into our IRC channel for more real-time help.
Jul 1, 2008 6:11pm
Img_missing_medium scott2345 11 posts

MP3 Player has been uploaded. http://www.buglabs.net/applications/Atraeus/MP3…

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Oct 8, 2012 8:07am
User_img_not_found_04_med micos2013 1 post

To get started you will need to download JLayer from
SourceForge
and extract the files. You will need to add jl1.0.jar to your CLASSPATH, which
should be in the root of the JLayer distribution.


JLayer ships with two players: javazoom.jl.player.Player and
javazoom.jl.player.advanced.AdvancedPlayer, that demonstrate how to use the
library. For the purposes of this article we’ll use the Player class to
play an MP3 file and report its progress.


The interface to use the Player class is to create an instance of it by
passing it an InputStream to an MP3 file. If the file is on your local file
system, you can use java.io.FileInputStream to create an InputStream by passing
a String filename. Next, call the Player’s play() method to start the
playback. While the player is playing you can call its getPosition() method to
find its position in the MP3 file in milliseconds and its isComplete() method to
find out if it has completed playing the MP3 file.

Pretty simple to use, but because the Player.play() method will take over the
thread that calls it, we will need to call it in a separate thread so that we
can report its progress through our MP3 file.

 

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and extract the files. You will need to add jl1.0.jar to your CLASSPATH, which
should be in the root of the JLayer distribution.

 

 

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