CODEWITHSUNDEEP
firefoxweb-audio-api
Thijs Koerselman
Thijs Koerselman

Reputation: 23271

Web Audio API Firefox setValueCurveAtTime()

I am crossfading some audio and I have a equal power curve stored in a table. I'm calling this function to start the fadeout. The fade parameter is a GainNode made with createGain()

fade.gain.setValueCurveAtTime(epCurveOut, context.currentTime, fadeTime);

In Chrome and Safari all goes well, but Firefox (v30) complains: SyntaxError: An invalid or illegal string was specified

Instead of context.currentTime I've tried 0 and 0.01. Is this method not implemented maybe? If so how would I alternatively schedule a cosine equal power ramp over time?

Upvotes: 2

Views: 337

Answers (2)

padenot
padenot

Reputation: 1555

This seems to be a bug on our end indeed, I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1069825 to track this.

Upvotes: 2

aldel
aldel

Reputation: 6748

Firefox seems to give that error whenever it doesn't like the parameters to setValueCurveAtTime. For example, if epCurveOut is an empty Float32Array, or if there is already a parameter change scheduled at the same time. I suspect the latter, because Chrome doesn't throw an error under the same circumstances. For example:

curve = new Float32Array([0.5, 0.5]);
node.gain.setValueCurveAtTime(curve, 5, 1);
node.gain.setValueCurveAtTime(curve, 5, 1);

Firefox throws the error the second time. Chrome doesn't throw an error. If you call node.gain.cancelScheduledValues(5) in between the calls to setValueCurveAtTime, Firefox allows it.

EDIT: Oh, hmm, Chrome doesn't complain about an empty Float32Array either. Well, anyway, Firefox seems to be much less forgiving, and gives that error when the arguments' types are correct but the values aren't allowed.

Upvotes: 1

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