Capture Rate 3 times 44100

[knightk]

I am using pulseaudio-0.9.10 with ALSA 1.0.16 and my target is an ARMv6.

I have the following in my default.pa

load-module module-alsa-sink device=hw:0 --rate=44100 --channels=2 --format=s16le sink_name=output load-module module-alsa-source device=hw:0 --rate=44100 --channels=2 --format=s16le source_name=input

ALSA file descriptors for capture data are causing poll() in pa_rtpoll_run() to invoke mmap_read() to read from the capture buffer enough packets to record at 3 x 44100. In reality the codec does not support such a high rate.

I have tested ALSA's utility arecord and it does not have this issue, therefore, I think that pulseaudio or one of its libraries is at fault.

[lennart]

0.9.10 is a very old PA version.

You sound driver is broken if it signals POLLOUT too often, or snd_pcm_avail() is broken. It should only signal POLLOUT when there is actually audio data to write. PA will only call mmap_read() if either POLLOUT or snd_pcm_avail() tell it it makes sense to do that.