java - Slowing down the playback of an audio file without changing its pitch? -

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i working on application college music majors. feature considering slowing down music playback without changing pitch. have seen done in commercial software, cannot find libraries or open source apps this.

  1. are there libraries out there?
  2. how done scratch various file formats?

note: working in java not oppossed changing languages.

timestretching quite hard. more slow down or speed sound more artifacts get. if want know sound listen "the rockafeller skank" fat boy slim. there lot of ways have own strengths , weaknesses. math can complex. that's why there many proprietary algorithms.

this page explains things bit clearer can , links dirac library. http://www.dspdimension.com/admin/time-pitch-overview/

i found link java code pitch shifting/timestretching http://www.adetorres.com/keychanger/keychangerreadme.html


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