This class was basically built to recognize attributes (like frequency, format, channels, resolution, compression, length, id3-tags) of audio-files (.wav,.aif,.mp3,.ogg at the moment). Furthermore the latest version includes a method to visualize audio-samples as known in common audio-software (waveLab, CoolEdit...) using the GD-library.
audio-sample-upload - this page enables its users to upload audio-samples which are automatically categorized by their attributes like resolution, framerate, format...
If you know an application of this package, send a message to the author to add a link here.