OpenAL Output Plugin for Winamp
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Framework Initial tag Sep 3, 2013
installer Updated & installer. Sep 2, 2013
.gitignore Initial commit Sep 2, 2013
ConfigFile.cpp Minor touch ups. Feb 22, 2010
ConfigFile.h Minor touch ups. Feb 22, 2010
ConfigStatusForm.cpp Initial tag Sep 3, 2013
ConfigStatusForm.h More work trying to fix 3D issue Jan 2, 2010
ConfigStatusForm.resx Added position and direction values to the 3D configuration screen Jan 1, 2010
Constants.h Added position and direction values to the 3D configuration screen Jan 1, 2010
Exports.def Fixes and updates Aug 5, 2009
External.cpp Updated the installer Feb 22, 2010
ExternalApplication.sln version 0.7.2 Jun 7, 2008
ExternalApplication.vcproj version 0.7.2 Jun 7, 2008
Info.rc Modified for Visual Express 2012. Sep 2, 2013
LICENSE Initial commit Sep 2, 2013
MAIN.H Cleanup Jan 24, 2010
Main.cpp More work trying to fix 3D issue Jan 2, 2010
Out_Effects.cpp Initial tag Sep 3, 2013
Out_Effects.h Initial tag Sep 3, 2013
Out_Openal.h Beta 7 - Fixes for volume control Oct 1, 2008
Out_Renderer.cpp Minor touch ups. Feb 22, 2010
Out_Renderer.h Minor touch ups. Feb 22, 2010
Out_Wumpus.cpp Initial tag Sep 3, 2013
Out_Wumpus.h Minor touch ups. Feb 22, 2010 Update Dec 14, 2013
Readme.txt Modified for Visual Express 2012. Sep 2, 2013
Version.h Modified for Visual Express 2012. Sep 2, 2013
Winamp.cpp Minor touch ups. Feb 22, 2010
Winamp.h Minor touch ups. Feb 22, 2010
out_wumpus.sln Modified for Visual Express 2012. Sep 2, 2013
out_wumpus.vcproj More work trying to fix 3D issue Jan 2, 2010
out_wumpus.vcxproj Initial tag Sep 3, 2013
out_wumpus.vcxproj.filters Initial tag Sep 3, 2013
resource.h Not MFC Dec 1, 2009

Wumpus Out OpenAL and all associated services will stop on Dec 20th, 2013.

There will be no further development.


Place the out_openal.dll file in Winamp\Plugins directory and select it as the Output plug-in (Plug-ins\Output).


  • Mono, Stereo, Multi-channel (4, 5.1, 7.1) audio at 8bit/16bit.
  • Hardware acceleration support
  • Low CPU utilisation even with software rendering
  • Expand Mono and Stereo to 4.0 (small performance hit)
  • 3D, move your speakers around
  • Reverb effects
  • XRAM support

Known Issues

  • No 24bit audio support, OpenAL doesn't support it
  • With 3D mode enabled, the streams go out of time


out_wumpus.sln The Project to load

OPENAL_SDK_DIR Environment variable pointing to the OpenAL SDK installation directory. On my system it's: C:\Development\OpenAL 1.1 SDK

WA_SDK_DIR The 'Winamp' folder of the Winamp SDK. This contains some of the stuff we need to talk to Winamp. On my system it's: C:\Program Files\Winamp SDK\Winamp

Change Log


  • Rebuilt with Vs2012
  • Minor tweaks


  • Updated - Minor clean-ups


  • Minor fix to try and sync multiple speakers to stop the out-of-phase or delay between the left & right channel issue


  • Added - Synchronised the start of audio (affects multiple renderers)
  • Added - x/y/z for listener position and direction
  • Added - Restore default settings for speaker matrix
  • Updated - Removed algorithm for finding next free buffer. This should reduce CPU usage quite a bit v0.9.10 =======
  • [Attempt] Fixed - 3D issue where it went out of phase.


  • Fixed - Issue with synchronisation and the output time for track position


  • Fixed - Memory leak when closing regarding Effects
  • Fixed - Skipping past the end of the file
  • Fixed - Skipping and sync issues, skipping over-run


  • Fixed - Doesn't re-play the end of the track when skipped
  • Fixed - Sync issues with FLAC files
  • Fixed - Mono source won't be affected by Matrix values (left/right etc)


  • Added - mono & stereo expansion back in
  • Changed - maximum buffer size to 6 seconds (6000ms) to better support XRAM


  • Fixed - XRAM detection/utilisation
  • Fixed - Audio cut off at the end


  • Added - Some proper XRAM notices
  • Fixed - 3D seperate renderers such as sync
  • Fixed - Panning


  • Added - Effects (reverb)


  • Added - seperate renderer support
  • Splitting of data to renderers


  • Added - initial Effects support


  • Updated - minor optimisations to Mono/Stereo expansion so it copies the data using single instructions rather than memcpy System Calls which should reduce CPU usage.


  • Fixed - Corrupt audio on VBR (Varible Bit Rate) Audio
  • Fixed - Memory leak with Mono/Stereo Expansion enabled
  • Fixed - Loading of the buffer size on the Configuration Window
  • Fixed - Loading of the volume
  • Fixed - Lockups when opening/skipping tracks
  • Fixed - XRAM cannot be enabled if it's absent
  • Added - XRAM utilisation
  • Updated - no internal buffering, passed straight to OpenAL to reduce memory usage and CPU utilisation. Even software rendering should have virtually no CPU usage.


  • Fixed - Pausing issue


  • Fixed - If the file is skipped when pause playback will resume (Thanks Goujon)


  • Added - Stereo expansion
  • Added - Mono expansion
  • Added - GUI bits to control Mono/Stereo expansion
  • Fixed - Expansion Fixed (no static)
  • Fixed - GUI changes for expansion actioned instantly, not after Winamp restart
  • Fixed - Skipping of FLAC files no longer causes halts/crashes
  • Added [disabled] - 3D Positioning, doesn't work (yet, 0.9 hopefully)
  • Updated - Will buffer 3 writes rather than 1 to stop buffer under-runs on startup
  • Fixed - Out of range volumes ignored, should solve the jump-loud problem
  • Fixed - Initial volume loaded properly rather than using maximum which may be wrong


  • Fixed - use correct Winamp.ini file
  • Fixed - validates buffer length is within bounds


  • Fixed bug if Winamp.ini had invalid values or didnt exist


  • Minor fix and tidy up


  • Updated: Use more but much smaller buffers (8k). This seems to work better than fewer larger ones although the affect on CPU performance is unknown. Still to test with H/W support
  • Fixed: Can change the buffer size during playback (may cause a pause while it clears all the bufers out)


  • Updated: Use fewer much larger buffers to test if this was more stable/optimal


  • Optimisations


  • Fixed: Very small files (<2sec) now work


  • Fixed: Memory over-run issue (causes blips, silence & crashses)
  • Updated: Have done some work on stereo expansion and EFX (currently disabled)


  • Fixed: Thread/sync dead lock


  • Fixed: Changing devices and options keeps playing tracks now
  • Fixed: Reduced maximum Monitor Interval to 30ms
  • Fixed: Low quality/short files now work
  • Fixed: Better stability when switching tracks or changing options


  • Fixed: Changing options doesn't crash Winamp anymore


  • Added: Configure Length, Buffer Sizes (Total Buffers = length/size) & Monitor Time The lower the monitor time the more processing is done 40ms is fine as this is shorter than a single buffer time
  • Fixed: Loading/Saving of some values
  • Fixed: Changing Audio Device fixes
  • Fixed: Closing Configuration Windows and re-opening doesn't crash anymore
  • Fixed: Skipping correctly continues visualisation


  • Added: Initial Effects support (disabled for now)
  • Added: Error messages
  • Fixed: Generic Software Support


  • Added: OpenAL Extensions are now shown
  • Added: Notice when 24bit playback is attempted
  • Updated: OpenAL SDK version being used updated -> This means Vista's users will see all EndPoints now -> Advise you stick to hardware though (this is usually shown as "default")
  • Updated: Changing a Device is applied instantly (will stop playback)
  • Fixed: Only one instance of the Configuration Window can be loaded
  • Fixed: Few bugs which cause Winamp to crash


  • Updated so prebuffering will kick off after 200ms rather than 2000ms
  • Updated internal monitor thread to clock at 50ms not 10ms


  • Added configuration/status screen


  • Fixed buffering issues for better throughput
  • Fixed sync & timing issues
  • Fixed skipping (fw/rw)
  • Optimisations


  • Fixed bug where volume not restored for next track


  • Multi-channel support
  • Volume change support


  • Initial build
  • Mono/Stereo Playback support