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In the src files and in the github repo the isPlaying function of the processing sound library returns a boolean. It seems that there is no current compiled library in the contribution manager. (the change to boolean instead of integer as return type has been months ago in github). I need to get the current compiled library version or the src files of the version that is in the contribution manager because I need to extend the SoundFile class for further functionality.
Answers
Here is the change you are referring to in src/processing/sound/SoundFile.java from a few weeks ago:
...and here is recent commit tagged with the current 1.4.0 release, currently available in the Contributions Manager. The release is two weeks ago:
Note that, within that release, isPlaying() returns an int, and SoundFile.java is much older, -- and the last commit on it is "took out isPlaying until callback is ready" (Apr 9, 2016):