[Bug 21345] New: There should be notification when the destination output changed

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21345

            Bug ID: 21345
           Summary: There should be notification when the destination
                    output changed
    Classification: Unclassified
           Product: AudioWG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Web Audio API
          Assignee: crogers@google.com
          Reporter: james.wei@Intel.com
        QA Contact: public-audio@w3.org

When changing accessories, the max number of channels can change, which has an
impact on virtualization and 3D positioning, you wouldn't use the same settings
and algorithms when switching from headset to speakers.

In case you are switching from local speakers to headphones, you are really
sending the same stream to the same low-level driver, and the switch is
typically handled in the audio codec hardware. You will have continuity of the
playback by construction, and the only time you'd need to reconfigure the graph
is if you have any sort of 3D positioning.
But if the new output is HDMI, Bluetooth A2DP, USB, there will be a delay and
volume ramps when switching, and it'd be perfectly acceptable to stop and
reconfigure without any impact to user experience. It'd be interesting to
capture this difference in the notification.

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Received on Wednesday, 20 March 2013 06:04:35 UTC