1201754 - playing particular sound with sound synthesizer via webaudio (with certain filters) kills all audio output in browser until restart

Status: NEW

(Core :: Web Audio, defect, P4)

Description

[Stephen Lavelle]

Attachment: AudioTestCase.zip

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/600.8.9 (KHTML, like Gecko) Version/8.0.8 Safari/600.8.9

Steps to reproduce:

go to http://ded.increpare.com/~locus/AudioTestCase/test.html (or unzip attached zip)

1 - click the "play good sound" link a couple of times. notice sound is good! a pew pew sound plays when you clic.

2 - click the "play bad sound" link once. Notice you can hear it. 

3 - click it again - notice you hear nothing

4 - try click the play good sound link, notice you can't play it

5 - try loading up youtube, and notice there's no audio output

6 - quit and reload browser, note that audio's back 


Actual results:

All web audio seems to get broken in firefox.


Expected results:

The bad sound should have played every time you clicked.

---

some further notes - the example isn't an absolutely minimal example, sorry :(

It seems it might be filter related - there's a function 

SoundEffect.prototype.play = function() {

in sfxr.js, if you comment it out and uncomment the version of it below (which is identical, but without audio filter channels) the bad sound plays just fine, without any troubles.

---

this problem also occurs in firefox v40.0.3, on windows as well as osx.

Comment 1

[Justin [:JW_SoftvisionQA]]

Hello Stephen,

I can not reproduce the exact bug you noted above but when I click "play bad sound" it plays and then a sound similar to "someone scratching a chalk board" continues to play until you close down the tab.

I'm not sure if that is how the noise is suppose to sound or if it is a bug. Please provide me with a little more detail and let me know if this bug is still present.

Thank you,

Justin

Comment 2

[Stephen Lavelle]

Hi, thanks for trying to repro this. I just tried it again in the current nightly (45.01) as well as the current release (42.0) and it happens in both as described in the bug report. Only on OSX, I don't have access to windows right now.

>Please provide me with a little more detail and let me know if this bug is still present.
What more detail can I usefully provide? 

>I can not reproduce the exact bug you noted above but when I click "play bad sound" it plays and then a sound similar to "someone scratching a chalk board" continues to play until you close down the tab.

that is a bit spooky - the 'bad' sound is a very short sound for me, it plays for about a second then suddenly stops. (it is an unpleasant sound though: sorry for making you listen to an unpleasant sound :( ).

Comment 3

[Maire Reavy [:mreavy]]

Paul -- Can you repro this?  If so, any idea what is happening?

Comment 4

[Paul Adenot (:padenot)]

We should be good now, this was a perf issue. Please reopen if I'm wrong.

Comment 5

[Stephen Lavelle]

still happens in nightly build 46.0a1 (2015-12-17)

one thing I've noticed in trying to reproduce it - when "play good sound" is clicked the speaker icon appears on the tab for a second and disappears when the sound has stopped, but when "play bad sound" is clicked the speaker icon never disappears, even when I can't hear anything.

If I refresh the tab, it's fine. 

Furthermore, so long as that tab is open after trying to play this sound, I can't play sounds in other browsers, or vlc, possibly anywhere.

Comment 6

[Maire Reavy [:mreavy]]

I can repro this in 46 Nightly 12/27/2015.

Paul, can you take a look when you have a chance?  I'm making this a p2 for now given it is triggered by playing a known-bad file.

Comment 7

[Paul Adenot (:padenot)]

I think this is just outputting a long tail that forms a DC offset or something.

Comment 8

[Bulk Bug Changes for mreavy's org]

Mass change P3->P4 to align with new Mozilla triage process.