2009/11/17 Tom Watson sdc695@yahoo.com
I just did an fresh install of a Fedora 11, and it went well for the most part. Then I tried some audio stuff, and it seems that pulseaudio (groan!) has a closing delay.
In my case I want to issue a "beep" then make a recording. This involves the equivalent of:
$ aplay beep.wav $ arecord -d recordit.wav
This used to work in a kernel of a few years ago, but in F11 there is a NOTICABLE delay from the end of the beep to the start of the recording. It can even be seen if one does a simple aplay and waits for the shell prompt. I was wondering if there was an option in a configuration file, or a hammer I can take to pulseaudio to solve this problem.
An added bit of information: The beep.wav file is about 0.1 second long (if that matters, which I believe it shouldn't).
Any clues would be appreciated, Thanks.
-- Tom Watson
In theory, minimum period bytes is 128 bytes if your alsa application are using alsa-pulse plugin
err = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_BUFFER_BYTES, 1, 4 * 1024 * 1024); if (err < 0) return err;
err = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, 128, 2 * 1024 * 1024); if (err < 0) return err;