Are there any libraries that can create a waveform image out of a audio file (mp3)?

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I want to create a spectrogram out of a audio file.

Are there any libraries that can create a waveform image out of a audio file (mp3) ?

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Prakash Raman On BEST ANSWER

http://www.freesound.org/blog/?p=10

I found this library, and it works well.