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Maniphest T165830

7.1 audio - back and surround channels are swapped
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Description

According to windows multichannel format description, the channels order in a stream should be following:
0:FL 1:FR 2:FC 3:LFE 4:BL 5:BR 6:SL 7:SR


(https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/channel-mask)

When testing 7.1 audio in game, I noticed that back and surround channels pairs are swapped:
0:FL 1:FR 2:FC 3:LFE 4:SL 5:SR 6:BL 7:BR
Please make the 7.1 channel order correct.

Details

Severity
Minor
Resolution
Open
Reproducibility
Always
Operating System
Windows 10 x64
Category
General
Steps To Reproduce
  • Set the 7.1 channel format in default audio device in windows (you can use "voice meeter" to emulate and monitor 7.1 channels levels).
  • In game setting set the output to Speakers.
  • Find a distinct sound source on the map and stand near it.
  • Turn character so the sound source is on the side, notice which channel level is the highest (it should be one from the last channel pair #6 or #7 (indexed from 0))
  • Turn character so the sound source is behind you, notice which channel level is the highest (it should be #4 or #5 (indexed from 0))

Event Timeline

lipek created this task.Jun 11 2022, 1:00 AM
lipek updated the task description. (Show Details)
lipek renamed this task from 7.1 audio - back an surround channels are swapped to 7.1 audio - back and surround channels are swapped.Jun 11 2022, 1:03 AM
Geez changed the task status from New to Assigned.Jun 14 2022, 1:33 PM
lipek added a comment.EditedJun 15 2022, 12:43 AM

I also noticed that voice talk is barely hearable when someone talks behind me. Like it is not properly distributed to side and back channels.
This causes that when driving a car I can hear only person on the front right passenger seat. To hear players on back seats I need to rotate the head which is disturbing during a drive.
This happens when in-game audio is set to "Speakers" and my system speaker configuration is set to 7.1.
When switching to "Stereo" mode in game settings, the VoIP can be heard from behind correctly (but then the in-game audio is not positional, only stereo).

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