Audacity -open source analyze

Audacity: A Free, Cross-Platform Digital Audio Editor.

 

(1)Audacity is based on code from the following projects::
   expat
   FLAC
   LAME
   libmad
   libsndfile
   Nyquist
   Ogg Vorbis
   PortAudio
   Resample
   SoundTouch
   wxWidgets

(2)Audacity is built upon other free libraries; some of these libraries may have come with Audacity in the lib-src directory.  Others you are expected to install first if you want Audacity to have certain capabilities.  Most
of these libraries are not distributed under the terms of the GPL, but rather some other free, GPL-compatible license.  Specifically:

  wxWidgets: LGPL
    Cross-platform GUI library - must be downloaded and
    compiled separately.

  expat: BSD-like license.
    Provides XML parsing.  Included with Audacity

  iAVC: LGPL
    Part of the code to the AVC Compressor effect.
    Included with Audacity.

  libid3tag: GPL
    Reads/writes ID3 tags in MP3 files.  Optional
    separate download as part of libmad.

  libmad: GPL
    Decodes MP3 files.  Optional separate download.

  libnyquist: BSD-like license.
    Functional language for manipulating audio; available
    within Audacity for effects processing.

  libogg: BSD-like license.
    Optional separate download, along with libvorbis.

  libflac: BSD-like license.
    Optional separate download for libsndfile

  libresample: LGPL
    High-quality audio resampling.
   
  libsndfile: LGPL
    Reads and writes uncompressed PCM audio files.
    Included with Audacity.

  libvorbis: BSD-like license.
    Decodes and encodes Ogg Vorbis files.  Optional
    separate download.

  SoundTouch: LGPL
    Changes tempo without changing pitch and vice versa.
    Included in audacity

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