[pulseaudio-discuss] troubleshooting asynchronous API for recording audio

Andrew Kelley superjoe30 at gmail.com
Fri Mar 13 12:36:37 PDT 2015

A couple more clues:

1. Once the recording hangs like this, when I call pa_stream_disconnect on
the record stream, pavucontrol says that my application is still recording.
If I call pa_stream_disconnect before the recording hangs like this, then
pavucontrol correctly reports that my application has stopped recording.

2. If I call pa_stream_peek more frequently, it is less likely for the
pa_stream_peek get into the state where it only returns nbytes = 0.

3. I'm getting an assertion failure just by recording the monitor of analog

Assertion '!e->next' failed at pulsecore/queue.c:106, function
pa_queue_pop(). Aborting.

#2  0x00007ffff046b8e5 in pa_queue_pop () from
#3  0x00007ffff046a94f in ?? () from /usr/lib/x86_64-linux-gnu/pulseaudio/
#4  0x00007ffff5b20d7a in pa_mainloop_dispatch () from
#5  0x00007ffff5b20f8c in pa_mainloop_iterate () from

On Fri, Mar 13, 2015 at 12:09 PM, Andrew Kelley <superjoe30 at gmail.com>

> I'm using the asynchronous API to record audio from a source. I'm able to
> obtain about 1-5 seconds of audio and then every time I call
> pa_stream_peek, I get nbytes = 0. Any troubleshooting suggestions?
> I have verified that the stream is not corked, not suspended, and I am in
> fact calling pa_stream_drop every time that nbytes > 0. I also noticed that
> when nbytes starts being 0 always, this other stream I have open, which is
> a playback stream, also stops having room for playback buffers.
> This is pulseaudio version 1:4.0-0ubuntu22.
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