[Csnd] Webaudio context and node for Csound WASM

The Csound Mailinglist
1

In the previous (Emscripten) version, we could get the Webaudio context from Csound by using

CSOUND_AUDIO_CONTEXT

We could also get the Csound node using

csound.getNode()

So for example, I could create an analyser in the same audio context and connect Csound to it

        scopeNode = CSOUND_AUDIO_CONTEXT.createAnalyser();
        csound.getNode().connect(scopeNode);

How is this done now in Csound WASM?

2

I figured out I can create an audio context

let actx = new AudioContext();

and then pass it to Csound

csound = await Csound({AudioContext: actx});

That seems to work.

So that seems to solve 1/2 my needs. The next thing is how to get the Csound node
so I can make the connection to my scope and mag spectrum plotter.

3

.getNode() should work. I'm not sure why it's not in the documentation
on NPMJS, but it's in our .d.ts:

I'll ask Hlodver about the documentation issue.

4

I found another way just now

csound.on("onAudioNodeCreated", node => { node.connect(scopeNode); });

getNote() did not seem to have been found.

5

ah, if we handle the promise correctly, it works too

node = await csound.getNode();
node.connect(scopeNode);