Bug 137305 – Calling WebCore::Page::setMediaVolume(0) does not mute videos as expected

• Component: Media
• Status: RESOLVED FIXED

[Ada Chan]

I have a simple test page with a video element in it:

<div id=target style="border: solid;">
    <video src="http://movies.apple.com/movies/us/apple/ipoditunes/2007/touch/ads/apple_ipodtouch_touch_r640-9cie.mov" autoplay controls></video>
</div>

I set the page's media volume to 0 with WKPageSetMediaVolume(0).  But I can still hear the video playing.

Looking at HTMLMediaElement::updateVolume(), it looks like the volume multiplier is only applied if m_volumeInitialized is true, and in this case it's not.

[Radar WebKit Bug Importer]

<rdar://problem/18614742>

[Ada Chan]

Looks like this was broken in http://trac.webkit.org/changeset/154970.

[Eric Carlson]

Removing the "if (m_volumeInitialized)" check in HTMLMediaElement::updateVolume will fix this problem, and I don't *think* it will change the GStreamer behavior because MediaPlayerPrivateGStreamerBase::setStreamVolumeElement does nothing unless m_volumeInitialized is true (HTMLMediaElement::mediaPlayerPlatformVolumeConfigurationRequired).

[Philippe Normand]

Sorry for the breakage :(

Looking at r154970 too, I agree with Eric that it should be enough to remove the "if (m_volumeInitialized)" test from ::updateVolume()

[Ada Chan]

Created attachment 240225 [details]
Patch

Please let me know if there's a way to write a test for this.

[Eric Carlson]

(In reply to comment #5)
> Created attachment 240225 [details]
> Patch
> 
> Please let me know if there's a way to write a test for this.
>
I don't think there is a way to add a test for this change, because any problems will only happen to users of the GTK port with some versions of pulse audio. 

You might be able to add a test for Page::setMediaVolume to ensure that it isn't broken in the future, but that will require fairly invasive changes so I am not sure it is worth while.

[Ada Chan]

Eric and Philippe: thanks for your help!

Committed:
http://trac.webkit.org/changeset/175003