Bug 172261
| Summary: | createMediaStreamSource only works when called shortly after stream is created | ||
|---|---|---|---|
| Product: | WebKit | Reporter: | Andrew Morris <andrew> |
| Component: | Web Audio | Assignee: | Nobody <webkit-unassigned> |
| Status: | RESOLVED WORKSFORME | ||
| Severity: | Normal | CC: | bfulgham, electroteque, eric.carlson, jer.noble, jonlee, webkit-bug-importer, youennf |
| Priority: | P2 | Keywords: | InRadar |
| Version: | WebKit Local Build | ||
| Hardware: | Mac | ||
| OS: | macOS 10.12 | ||
Andrew Morris
WebKit's createMediaStreamSource has a bug which requires it to be called very soon after the stream is created. If called after a delay it appears to produce a silent webaudio node.
navigator.mediaDevices.getUserMedia({ audio: true }).then((stream) => {
cleanupJobs.push(() => stream.getTracks().forEach(track => track.stop()));
if (useDelay) {
// Bug occurs
return delay(500).then(() => stream);
}
// Bug does not occur
return stream;
}).then((stream) => {
const source = audioCtx.createMediaStreamSource(stream);
// ... Visualize audio data from source
};
Super easy repro here:
https://output.jsbin.com/hegijaz
Built from github hash 141b0ddff819d52e6e8ceeed29dc72fba5d4b1a6, git-svn-id: http://svn.webkit.org/repository/webkit/trunk@216354 268f45cc-cd09-0410-ab3c-d52691b4dbfc
| Attachments | ||
|---|---|---|
| Add attachment proposed patch, testcase, etc. |
Radar WebKit Bug Importer
<rdar://problem/32266432>
Andrew Morris
The jsbin doesn't repro the issue for me anymore in a more recent build (git b54ca7d). However I suspect the issue is still there for remote streams. Please get in touch for more details if needed.
Daniel Rossi
The problem is evident here merely changing streams and setting up a new mediastreamsource. on IOS
https://jsfiddle.net/danrossi303/gsLy96hc/3/