[pulseaudio-discuss] Audible plop at beginning when using pcat-simple

[mindfsck]

Thanks Sean. I unloaded the suspend module but the plop is still there.
I don't really think it is HW related since the file plays just fine with
paplay and aplay.

On Fri, Aug 27, 2021 at 5:49 AM Sean Greenslade <sean at seangreenslade.com>
wrote:

> On Thu, Aug 26, 2021 at 09:43:23PM +0200, mindfsck wrote:
> > Hi there,
> >
> > I was using this example to simply play a WAV file without having much
> clue
> > of audio:
> >
> https://www.freedesktop.org/software/pulseaudio/doxygen/pacat-simple_8c-example.html
> > I changed the sources to match (IMHO) my settings, i.e. channels=1 and
> > rate=48000.
> >
> > I have two wavefiles, the first plays as it should (compared with command
> > line paplay or aplay) and the second one has an audible PLOP (but only
> > around 90% of the time) at the very beginning of playback:
> >
> > (1 - OK)
> > General
> > Complete name                            : out_clean.wav
> > Format                                   : Wave
> > File size                                : 81.3 KiB
> > Duration                                 : 866 ms
> > Overall bit rate mode                    : Constant
> > Overall bit rate                         : 769 kb/s
> > Audio
> > Format                                   : PCM
> > Format settings                          : Little / Signed
> > Codec ID                                 : 1
> > Duration                                 : 866 ms
> > Bit rate mode                            : Constant
> > Bit rate                                 : 768 kb/s
> > Channel(s)                               : 1 channel
> > Sampling rate                            : 48.0 kHz
> > Bit depth                                : 16 bits
> > Stream size                              : 81.2 KiB (100%)
> >
> > (2 - NOK)
> > General
> > Complete name                            : out_short_clean.wav
> > Format                                   : Wave
> > File size                                : 22.8 KiB
> > Duration                                 : 242 ms
> > Overall bit rate mode                    : Constant
> > Overall bit rate                         : 772 kb/s
> > Audio
> > Format                                   : PCM
> > Format settings                          : Little / Signed
> > Codec ID                                 : 1
> > Duration                                 : 242 ms
> > Bit rate mode                            : Constant
> > Bit rate                                 : 768 kb/s
> > Channel(s)                               : 1 channel
> > Sampling rate                            : 48.0 kHz
> > Bit depth                                : 16 bits
> > Stream size                              : 22.8 KiB (100%)
> >
> > I tried using different BUFSIZE and my systemload is also not an issue...
> > Any ideas?
>
> I've experienced something like this with a few built-in audio cards on
> various laptops. It's never bothered me enough to track it down, but I
> suspect it's due to the suspending and resuming of cards. Can you try
> disabling the autosuspend module and see if it still happens? Use this
> command to temporarily disable it until the next time pulse reloads:
>
> $ pactl unload-module module-suspend-on-idle
>
> --Sean
>
>
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