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

[mindfsck]

>
> Why is the sample rate set to 48000?
>

No idea! The sourcing of the file is outside of my hands..

On Fri, Aug 27, 2021 at 4:14 PM guest271314 <guest271314 at gmail.com> wrote:

> Why is the sample rate set to 48000?
>
> On Fri, Aug 27, 2021 at 6:40 AM mindfsck <mindfsck at gmail.com> wrote:
>
>> 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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