[pulseaudio-discuss] write callback stops getting called

Andrew Kelley superjoe30 at gmail.com
Sat Apr 4 20:14:07 PDT 2015

Found this just after I sent the email:

To make sure that a particular stream doesn't stop to play when a server
> side buffer underrun happens on it while the other synchronized streams
> continue playing and hence deviate, you need to pass a "prebuf"
> pa_buffer_attr of 0 when connecting it.


I tried setting `prebuf` to 0 instead of `(uint_t) -1` and it looks like
that did the trick.

On Sat, Apr 4, 2015 at 8:06 PM, Andrew Kelley <superjoe30 at gmail.com> wrote:

> I have a program which plays an audio file with some filtering using the
> PulseAudio asynchronous API. When the CPU usage spikes elsewhere in my
> computer, for example if I do `make -j` to use up all processing power, the
> filter code runs a little slow and might cause a buffer underrun. Sometimes
> this causes PulseAudio to stop calling the write callback. I checked and I
> am certainly calling `begin_write` and `write` for each time that the write
> callback is called.
> How can I ensure that PulseAudio continues to call the write callback?
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