integrating soundcard callbacks with libuv

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Jonah Fox

Jan 11, 2021, 6:37:11 AM1/11/21
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Hi I'm trying to capture audio (using portaudio) and send and receive UDP packets.

I'm trying to work out how to integrate with the libuv loop from the soundcard callback.

*If I send using libuv directly from the loop - it occasionally crashes (perhaps expected)
* I could write into a buffer and have a libuv timer process this - but I'd get wasted latency.
* perhaps I can write into a buffer and direct libuv to wake up. I did try using uv_async, but it seemed to be too slow. 

What is the correct thing to do here?


Ben Noordhuis

Jan 12, 2021, 6:40:57 AM1/12/21
Is your soundcard callback called on the same thread as libuv or a
different one? I assume it's a different one and in that case
uv_async_send() is the right thing to use.

You say it's too slow. What kind of latency do you see? How and when
do you call uv_run()? Do you have callbacks that take a while to
complete? A uv_async_t callback won't run until libuv gets the
opportunity to poll for new events.
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