586612 - HTML5 <audio>: no playback of WAV data URI if shorter than 370ms

Status: VERIFIED FIXED

(Core :: Audio/Video, defect)

Description

[Markus Walther]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.25 Safari/534.3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8

There seems to be a regression regarding WAV data URI playback, which looks like a minimum-buffer-size issue. 

Such audio doesn't play until a minimum size of approx. 370ms is reached.

This is a showstopper for all applications doing fine-grained audio manipulation.

Reproducible: Always

Steps to Reproduce:
1. Embed the <audio> with short WAV (16-bit PCM, 22050Hz, mono) data URI in a web page.
2. Load page in Firefox 3.6.8 for Windows
3. Listen to sound
Actual Results:  
no sound output

Expected Results:  
sound playback

<audio src="data:audio/x-wav;base64,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" autoplay>

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

No Sound on 1.9.2 and Trunk (on WinXP).
No Sound with Google Chrome 6.0.490.0 (Official Build 55537).
There's Sound with Opera 10.70 build 3477.

Comment 2

[Matthew Gregan [:kinetik]]

Attachment: testcase

Markus's testcase.

This works for me on trunk with Windows 7, so I can't reproduce this.

Comment 3

[Matthias Versen [:Matti]]

wfm with Seamonkey trunk on win7

Comment 4

[Markus Walther]

Still no sound with Firefox 3.6.10 on WinXP.

This is a somewhat recent regression, since it definitely used to work for small audio fragments on Firefox / WinXP.

Also I don't quite understand the relevance of Win 7 - surely one would aim for cross-platform audio, no? XtC4UaLL confirmed above it's a bug for WinXP.

So I renew my plea to work on this bug.

Comment 5

[Matthew Gregan [:kinetik]]

Windows 7 is just what I have available to test on.  It's not clear from the original bug report that the problem is XP-specific, and the same code is used on all Windows versions, so it's useful to test against multiple versions to narrow down the problem.I suspect this is a regression from bug 484814, but I'll need to find a Windows XP machine to test on to be sure.  It's likely that the trunk fix in bug 564734 is also needed on the branch.

Comment 6

[(mostly gone) XtC4UaLL [:xtc4uall]]

(In reply to comment #5)
> It's likely that the trunk fix in bug 564734 is also needed on the branch.
I can confirm that this has been fixed on Trunk within
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=2108d2458719&tochange=85e10f4b4a9e what includes Bug 564734.

Comment 7

[Andrey]

I confirm that there is a bug in version 3.6.12
In version 4.0b7 has fixed

Comment 8

[Chris Pearce [:cpearce (Not reading bugmail)]]

(In reply to comment #7)
> I confirm that there is a bug in version 3.6.12
> In version 4.0b7 has fixed

WFM on Win7 native [Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b10pre) Gecko/20110120 Firefox/4.0b10pre] and on WinXP (in VM) [Mozilla/5.0 (Windows NT 5.1; rv:2.0b9) Gecko/20100101 Firefox/4.0b9].

Still doesn't work in 3.6, but we only take security & stability fixes on non-trunk branches, so resolving fixed by bug 564734 as per comment 6.