Support Dolby Reference Player GStreamer Plugins as Optional Dolby Atmos Backend

[laflahomie-collab]

Hi,

I investigated Dolby Reference Player and found something that may be relevant to KSPlayer.

Dolby Reference Player ships with GStreamer 1.22 and several Dolby-specific plugins, including:

• dlbac3dec
• dlbtruehddec
• dlbac3parse
• dlbtruehdparse
• dlboar (Dolby Object Audio Renderer)
• dlbaudiodecbin

From my inspection, these plugins appear capable of decoding:

• Dolby Digital Plus (E-AC3)
• Dolby Digital Plus JOC (Atmos)
• Dolby TrueHD
• Dolby TrueHD Atmos

and rendering Atmos object metadata through Dolby OAR into layouts such as:

• 5.1.2
• 5.1.4
• 7.1.2
• 7.1.4
• 7.1.6
• 9.1.2
• 9.1.4
• 9.1.6

This suggests a potentially different approach from using AVPlayer.

Instead of controlling Dolby Reference Player itself, KSPlayer could investigate whether licensed users who own Dolby Reference Player could optionally use the Dolby GStreamer plugins already installed on their system.

Possible architecture:

KSPlayer:

• MKV demuxing
• Video rendering
• Subtitles
• Seeking
• Playback synchronization
• UI

Audio path:

appsrc
-> dlbac3parse / dlbtruehdparse
-> dlbac3dec / dlbtruehddec
-> dlboar
-> appsink

KSPlayer would then receive decoded PCM from appsink and keep full control over playback synchronization.

You can check it out and trial free here : https://professionalsupport.dolby.com/s/dolby-reference-player?language=en_US it's not too expensive so I think it can be a good compromise

[djtwxj]

https://github.com/[mgth/Omniphony](https://github.com/mgth/Omniphony)

this project donot need dolby plugin

[laflahomie-collab]

Hey nice project ! the main limitation I see for now is platform support. The Omniphony docs/releases seem focused on Linux and Windows. I did not see a ready macOS path yet. Also, it does not appear to support AC-4 currently wich is becoming Dolby Standard but other than that it's might make things more easy to implement. Let's hope for the best .