[Webkit-unassigned] [Bug 217860] New: 5.1 audio received over WebRTC is downmixed to stereo

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217860

            Bug ID: 217860
           Summary: 5.1 audio received over WebRTC is downmixed to stereo
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: juberti at google.com
                CC: youennf at gmail.com

When receiving 5.1 channel Opus content over WebRTC, all channels are received and decoded but downmixed to stereo, even when a 5.1-compatible sound card is connected. 
<audio/> tags, on the other hand, do render 5.1 content properly, e.g., https://www2.iis.fraunhofer.de/AAC/multichannel.html.

This suggests that somewhere along the line a mixer is not being initialized with the right number of channels. I looked through the playout path and didn't see anything obvious, but I didn't investigate closely.

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