Bug 207325 - Regression: RTCRtpSender.getCapabilities("video") returns null on iOS 13.4 (17E5223h)
Summary: Regression: RTCRtpSender.getCapabilities("video") returns null on iOS 13.4 (1...
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebRTC (show other bugs)
Version: Safari 13
Hardware: iPhone / iPad iOS 13
: P2 Normal
Assignee: youenn fablet
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2020-02-06 04:16 PST by daginge
Modified: 2020-02-11 14:53 PST (History)
11 users (show)

See Also:

Attachments
Patch (4.86 KB, patch)
2020-02-11 11:48 PST, youenn fablet 		no flags Details | Formatted Diff | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description daginge 2020-02-06 04:16:44 PST 
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.
Comment 1 Radar WebKit Bug Importer 2020-02-06 08:48:21 PST 
<rdar://problem/59224810>
Comment 2 youenn fablet 2020-02-06 08:49:27 PST 
Seems bad, reproed it for both audio and video.
Comment 3 youenn fablet 2020-02-06 23:38:01 PST 
Hum, the current workaround is to instantiate a peer connection and then to call getCapabilities.
Comment 4 youenn fablet 2020-02-11 11:48:10 PST 
Created attachment 390401 [details]
Patch
Comment 5 WebKit Commit Bot 2020-02-11 14:53:14 PST 
Comment on attachment 390401 [details]
Patch

Clearing flags on attachment: 390401

Committed r256377: <https://trac.webkit.org/changeset/256377>
Comment 6 WebKit Commit Bot 2020-02-11 14:53:15 PST 
All reviewed patches have been landed.  Closing bug.