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

On Thu, Aug 28, 2014 at 3:10 PM, John Lin <jolin@mozilla.com> wrote:

> Robert O'Callahan <robert@ocallahan.org> 於 2014/8/28 上午10:10 寫道：
>
> 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?
>

We could do that, but it's simpler to just fix AudioDestinationNode to have
an output.

Rob
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