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Re: Extending MediaRecorder to record from Web Audio node faster than real time?

From: John Lin <jolin@mozilla.com>
Date: Thu, 28 Aug 2014 11:10:14 +0800
Cc: "public-media-capture@w3.org" <public-media-capture@w3.org>
Message-Id: <F973FC08-7B3E-4A77-9BC3-0EA6468D19EB@mozilla.com>
To: robert@ocallahan.org

Robert O'Callahan <robert@ocallahan.org> ©ó 2014/8/28 ¤W¤È10:10 ¼g¹D¡G

> On Thu, Aug 28, 2014 at 1:49 PM, Robert O'Callahan <robert@ocallahan.org> wrote:
> With the above "definition", ChannelSplitterNode is not a problem; the 0'th output (the first channel) of audioNode gets recorded and the others are ignored. We'd just need to say that in the spec.
> 
> Let me clarify that:
> 
> "new MediaRecorder(audioNode)" records the first output of audioNode (where "output" is defined in the Web Audio spec).
> 
> For those unfamiliar with Web Audio: currently only ChannelSplitterNode has more than one output. Each output can have any number of channels.
> 
> BTW AudioDestinationNode has 0 outputs so I think if someone creates a MediaRecorder for that node we should just throw an exception. Alternatively we could change the Web Audio spec so it actually has an output (the mix of its inputs). I actually prefer the latter since it's more DWIM; I'll post to public-audio.

 Is it necessary to give AudioDestinationNode an output? Couldn¡¦t we just say that MediaRecorder records the mix of inputs of the destination node for AudioContext, and OfflineAudioCompletionEvent.renderedBuffer for OfflineAudioContext?

> 
> Rob
> -- 
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Received on Thursday, 28 August 2014 03:10:41 UTC

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