[Webkit-unassigned] [Bug 207325] New: Regression: RTCRtpSender.getCapabilities("video") returns null on iOS 13.4 (17E5223h)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207325

            Bug ID: 207325
           Summary: Regression: RTCRtpSender.getCapabilities("video")
                    returns null on iOS 13.4 (17E5223h)
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: daginge at confrere.com
                CC: youennf at gmail.com

If you call RTCRtpSender.getCapabilities("video") on iOS 13.4, it returns null. Previously this returned an object with available codecs.

Repro steps:
1. Go to https://codepen.io/daginge/full/XWbWeWN on iOS 13.4
2. Accept camera permissions (unsure if this is actually neccessary, but included it anyway)
3. See that "Available codecs" in the log is null. If you test this on 13.3 it returns as expected.

Impact:
We use this to determine if some legacy devices support H264 on Chrome. This falsely triggered an error message on iOS that H264 is not supported.

Workaround:
Just assume that iOS 13.4 supports H264 and VP8.

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