Web Audio is the JavaScript-side API that's being used; OpenAL serves as a
C-side API in front of it.

If you can get the Web Audio AudioContext object, you should be able to
capture that via context.createMediaStreamDestination():
https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/createMediaStreamDestination
https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamAudioDestinationNode

The node's "stream" property will be a MediaStream that you can send into
RTC (at which point my knowledge of this system gets a lot fuzzier :D)

-- brion


On Tue, Aug 22, 2017 at 10:21 AM, Kai Kuehne <kai.kue...@gmail.com> wrote:

> Hi,
> I'm using the MediaCapture-API to capture the video rendered
> to a Canvas by emscripten to send it to another browser via
>  a RTCPeerConnection.
>
> How do I access the audio that is being played by emscripten
> to also send it across the connection?
>
> I found a ticket [1] that mentions that one can export the AL object
> and access the audio that way. Is this still relevant?
>
> To be honest, since I'm still in the early stages of development,
> I don't know whether the audio is currently being handled by
> OpenAL or WebAudio.
>
> Thanks!
>
> https://github.com/kripken/emscripten/issues/3599
>
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