i just published version 1.0.5 of my xy-oscilloscope here:
a video of me testing it on some special audio files: https://www.youtube.com/watch?v=AiOFRXQsfRQ&feature=youtu.be
and some stills: https://www.flickr.com/photos/64009416@N00/albums/72157660020714356
this new version now has shaders that reload on the fly, so it’s possibly also a fun testing environment for line shaders.
the code is open source all the way and can be found on my github: https://github.com/kritzikratzi/Oscilloscope
in this context the more interesting thing is likely the ofxAvCodec library that also came out of this: https://github.com/kritzikratzi/ofxAvCodec it can read and write a ton of audio formats (except aac). however, you still need to compile your own shared lib of ffmpeg (if you don’t wanna do that you can grab those distributed with the oscilloscope app and place them in libs/avcodec/lib/win32)