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Re: AudioBufferSourceNode.gain

From: Ehsan Akhgari <ehsan.akhgari@gmail.com>
Date: Sat, 11 May 2013 19:08:44 -0400
Message-ID: <CANTur_79r_yiErRYj8kuFkFA=YEF34RV-A_sD1CoGVg+ocEMsA@mail.gmail.com>
To: Chris Rogers <crogers@google.com>
Cc: "public-audio@w3.org" <public-audio@w3.org>
Sigh.  OK, can you please spec it?  I'll work on a Gecko patch...

--
Ehsan
<http://ehsanakhgari.org/>


On Thu, May 9, 2013 at 2:24 PM, Chris Rogers <crogers@google.com> wrote:

>
>
>
> On Mon, Apr 15, 2013 at 8:43 AM, Ehsan Akhgari <ehsan.akhgari@gmail.com>wrote:
>
>> WebKit and Blink implement a gain attribute on the AudioBufferSourceNode,
>> and looking at the implementation, it works exactly as if the output of
>> AudioBufferSourceNode was directly fed into a GainNode.  However, this
>> attribute is not spec'ed, and therefore Gecko doesn't implement it.
>>
>> Over in https://bugzilla.mozilla.org/show_bug.cgi?id=861591, we have a
>> game which is relying on AudioBufferSourceNode.gain and breaks in Firefox
>> Nightly because that attribute does not exist.  We can do either of the
>> following two thing:
>>
>> 1. The right thing to do: continue to not spec AudioBufferSourceNode.gain
>> and remove it from both WebKit and Blink.  I doubt that there is a lot of
>> content out there using this attribute, given how late this bug was found
>> in Gecko.
>>
>
> Unfortunately there's enough content out there using it that I cannot
> recommend removing it from WebKit/Blink.  One notable one is
> http://playcanvas.com/ which is a game library.
>
>
>>
>> 2. If WebKit/Blink is not willing to remove this non-standard attribute,
>> then we should perhaps spec it.  This will be sad, since this attribute
>> doesn't really serve any purpose and it's unusual for a node to support the
>> functionality of another node in this way.
>>
>
> I agree that it's redundant, and slightly ugly, but I think we'll need to
> spec it.  Luckily, it's very easy to implement and its meaning is clear.
>
>
>>
>> Regardless of the outcome of this discussion, I will try to reach out to
>> the author of that game and ask them to change their code based on the Web
>> Audio spec.
>>
>> Thanks!
>> --
>> Ehsan
>> <http://ehsanakhgari.org/>
>>
>
>
Received on Saturday, 11 May 2013 23:09:52 UTC

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