Hello!

I am writing an external noise cancellation plugin for ALSA, based on rnnoise, but I've hit a bit of a roadblock: rnnoise processes chunks of 480 floats at a time and does no buffering, but alsa expects the transfer callback to take all the data from the input and put it onto the output, with no way to signal that any buffering is or should be happening.

I have tried to return a multiple of 480 from the transfer callback and keep a buffer with the leftover data, to be prepended to the next payload, but it looks like ALSA will, when a plugin returns too little data, just send back the same non-processed data in a new call, which breaks this idea.

Any way I can work around these limitations?

Another solution could be for external plugins to report the amount they consumed and produced, rather than a single number for both, but I am not aware of how to do that, if it's even possible with the filter plugin SDK.

Thanks in advance!

EDIT: I had previously posted this question before I confirmed my mailing list membership, but seeing as it wasn't approved for a few days I cancelled the request and reposted it. Sorry about that.