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Draft: feat: Add multiple audio tracks playback support

Ayush Dey requested to merge feature/multiple-audio-stream-playback into master

Add multiple audio tracks playback support

Google Summer of Code 2023
Mentee: Ayush Dey
Mentor: Thomas Guillem


Add support for playing multiple audio tracks simultaneously from a media on systems using PulseAudio as the sound server.


Work breakdown

  • Modify the audio output (aout) module API to support multiple streams by splitting device and stream handling.
  • Implement the aout API within the PulseAudio module.
  • Adapt the core to conditionally handle device and stream splitting (i.e., stream handling for adapted aout modules and device handling for legacy aout modules).
  • Enhance the Player API to provide users with greater control over multiple audio streams.
  • Incorporate these modifications into the Qt/VLC-ports to create an optimal GUI for controlling multiple streams.

Current features

  • Multiple audio track selection is disabled by default but can be enabled from the GUI, similar to subtitles.
  • An infinite number of audio streams can be initiated from a single aout object.
  • A single Play/Pause/Mute/Volume button controls all the tracks playing in parallel.
  • The core will generate multiple streams from a single aout object for adapted modules and multiple aout objects for legacy modules.

Future work

  • Adaptation of the remaining common aout modules (Wasapi, Auhal, AAudio, Pipewire, etc.).
  • Individual Play/Pause/Mute/Volume buttons for each track.


I would like to thank the team at VideoLAN for their support and especially my mentor Thomas Guillem, who has guided me actively throughout the development of this feature.

Edited by Ayush Dey

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