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Re: MediaElementAudioSourceNode and cross-origin media resources

From: Joe Berkovitz <joe@noteflight.com>
Date: Tue, 23 Jul 2013 17:59:41 -0400
Message-Id: <18E473EF-0BDF-4613-9BCB-0E56BE599B5E@noteflight.com>
Cc: Robert O'Callahan <robert@ocallahan.org>, Ehsan Akhgari <ehsan.akhgari@gmail.com>, "public-audio@w3.org" <public-audio@w3.org>
To: Chris Wilson <cwilso@google.com>
Thanks for translating my garbled off-the-cuff statement. You got the sense of it.

I think there used to be a loader method in the API that bypassed the need for an XHR, which led to my confusion. 

.            .       .    .  . ...Joe

Joe Berkovitz
President
Noteflight LLC
+1 978 314 6271
www.noteflight.com
"Your music, everywhere."

On Jul 23, 2013, at 5:33 PM, Chris Wilson <cwilso@google.com> wrote:

> I think Joe meant "I note that decoding network files into AudioBuffers would naturally already adhere to CORS, since you'd use XHR to download them."
> 
> 
> On Tue, Jul 23, 2013 at 2:28 PM, Robert O'Callahan <robert@ocallahan.org> wrote:
>> On Wed, Jul 24, 2013 at 8:09 AM, Joseph Berkovitz <joe@noteflight.com> wrote:
>>> Not only should we subject this to CORS rules, I think we *must* subject it to CORS rules. Audio assets are commonly delivered from CDNs and these are typically located at an origin foreign to the containing page.
>> 
>> Sure. However, authors will have to use the crossorigin attribute on the media element to generate a CORS-enabled request.
>>  
>>> I note that AudioBuffer.decodeAudioData obeys CORS as a fact on the ground in both the FF implementation and Webkit/Blink.
>> 
>> I don't see how CORS is relevant to decodeAudioData. decodeAudioData takes an ArrayBuffer, which can never be cross-origin.
>> 
>> Rob
>> -- 
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> 
Received on Tuesday, 23 July 2013 22:00:12 UTC

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