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Aqualung is a music player for the GNU/Linux operating system

Aqualung is a music player for the GNU/Linux operating system. It plays audio files from your filesystem and has the feature of inserting no gaps between adjacent tracks. It also supports high quality sample rate conversion between the file and the output device, when necessary.

Almost all sample-based, uncompressed formats (e.g. WAV, AIFF, AU etc.) are supported. Files encoded with FLAC (the Free Lossless Audio Codec), Ogg Vorbis, Ogg Speex, MPEG Audio (including the infamous MP3 format) and MOD audio formats (MOD, S3M, XM, IT, etc.), Musepack are also supported.

The program can play the music through OSS, ALSA or using the JACK Audio Connection Kit.

Aqualung supports the LADSPA 1.1 plugin standard. You can use any suitable plugin to enhance the music you are listening to.

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Features at a glance

On the input side:

  • Audio CDs can be played back and ripped to the Music Store with on-the-fly conversion to WAV, FLAC, Ogg Vorbis or CBR/VBR MP3 (gapless via LAME). Seamless tagging of the created files is offered as part of the process.
  • Internet radio stations streaming Ogg Vorbis or MP3 are supported.
  • Subscribing to RSS and Atom audio podcasts is supported. Aqualung can automatically download and add new files to the Music Store. Optional limits for the age, size and number of downloaded files can be set.
  • Almost all sample-based, uncompressed formats (e.g. WAV, AIFF, AU etc.) are supported. For the full list of these formats, visit the libsndfile homepage.
  • Files encoded with FLAC (the Free Lossless Audio Codec) are supported.
  • Ogg Vorbis and Ogg Speex audio files are supported.
  • MPEG Audio files are supported. This includes MPEG 1-2-2.5, Layer I-II-III encoded audio, including the infamous MPEG-1 Layer III format also known as MP3. For tracks containing the appropriate LAME headers, the MPEG encoder delay and padding is eliminated by Aqualung, resulting in truly gapless playback. Aqualung also supports VBR (variable bitrate) and UBR (unspecified bitrate) MPEG files.
  • MOD audio files (MOD, S3M, XM, IT, etc.) are supported via the high quality libmodplug library.
  • Musepack (a.k.a. MPEG Plus) files are supported.
  • Files encoded with Monkey's Audio Codec are supported.
  • WavPack files are supported via a native decoder.
  • Numerous formats and codecs are supported via the FFmpeg project, including AC3, AAC, WMA, WavPack and the soundtrack of many video formats.
  • Naturally, any of these files can be mono or stereo.
On the output side:
  • OSS driver support
  • ALSA driver support
  • JACK Audio Server support
  • Win32 Sound API (available only under native Win32 or Cygwin)
  • Exporting files to external formats from Playlist and Music Store is supported.

In between:

  • Continuous, gap-free playback of consecutive tracks. Your ears get exactly what is in the files – no silence inserted in between.
  • Ability to convert sample rates between the input file and the output device, from downsampling by a factor of 12 to upsampling by the same factor. The best converter provides a signal-to-noise ratio of 97dB with -3dB passband extending from DC to 96% of the theoretical best bandwidth for a given pair of input and output sample rates.
  • LADSPA plugin support – you can use any suitable LADSPA plugin to enhance the music you are listening to. There are many different equalizer, spatial enhancer, tube preamp simulator etc. plugins out there. If you don't have any, grab these.

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Other niceties:
  • Playlist tabs allow you to have multiple playlists for your music at the same time, very similarly to multiple tabbed browsing in Firefox.
  • Internally working volume and balance controls (not touching the soundcard mixer).
  • Support for multiple skins; changing them is possible at any time.
  • Support for random seeking during playback.
  • Track repeat, List repeat and Shuffle mode (besides normal playback). In track repeat mode the looping range is adjustable (A-B repeat).
  • Ability to display and edit Ogg Xiph comments, ID3v1, ID3v2 and APE tags found in files that support them.
  • All windows are sizable. You can stretch the main window horizontally for more accurate seeking.
  • You can control any running instance of the program remotely from the command line (start, stop, pause etc.). Remote loading or enqueueing soundfiles as well as complete playlists is also supported.
  • State persistence via XML config files. Aqualung will come up in the same state as it was when you closed it, including playback modes, volume and balance settings, currently processing LADSPA plugins, window sizes, positions and visibility, and other miscellaneous options.

In addition to all this, Aqualung comes with a Music Store that is an XML-based music database, capable of storing various metadata about music on your computer (including, but not limited to, the names of artists, and the titles of records and tracks). You can (and should) organize your music into a tree of Artists/Records/Tracks, thereby making life easier than with the all-in-one Winamp/XMMS playlist. Importing file metadata (ID3v1, ID3v2 tags, Ogg Xiph comments, APE metadata) into the Music Store as well as getting track names from a CDDB/FreeDB database is supported.

Although Aqualung is officially still in beta stage, it is fairly stable for everyday use. If you are looking for a player that works, Aqualung may be just what you need.

Aqualung is released under the GNU General Public License. For more info, see the Misc page.

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About Hugo Repetto

Ubuntu is a Linux distribution that offers an operating system predominantly focused on desktop computers but also provides support for servers. Based on Debian GNU / Linux, Ubuntu focuses on ease of use, freedom in usage restriction, regular releases (every 6 months) and ease of installation.
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