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stability of AudioBufferSourceNode.playbackState, and activeSourceCount

From: Robert O'Callahan <robert@ocallahan.org>
Date: Tue, 30 Oct 2012 00:26:32 +1300
Message-ID: <CAOp6jLZbMyJUUwO7VwRRa55duZYVXWBLF1e2RMjdbAJZ5WVMvg@mail.gmail.com>
To: public-audio@w3.org
AudioBufferSourceNode.playbackState is described as being changed by the
start() method (i.e. synchronously on the HTML5 event loop thread) and then
being changed due to audio processing (i.e. NOT on the HTML5 event loop
thread). How are changes to PLAYING_STATE and FINISHED_STATE reflected to
the HTML5 event loop thread? Is it supposed to be possible for script to
check playbackState one moment and see SCHEDULED_STATE, then a moment later
(without returning to the event loop) to check it again and see
PLAYING_STATE? I hope not, for that would make playback states other than
UNSCHEDULED and SCHEDULED pretty much impossible to use correctly.

Hmm, actually, what are the use-cases for playbackState? I can't tell what
it could be safely used for.

activeSourceCount has similar issues, since it counts the playing
AudioBufferSourceNodes. Is it supposed to change at arbitrary times? What
are the use-cases for activeSourceCount anyway?

Rob
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Received on Monday, 29 October 2012 11:27:00 UTC

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