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

[guest271314]

What happens when you resample to 22050?

On Fri, Aug 27, 2021 at 7:18 AM mindfsck <mindfsck at gmail.com> wrote:

> 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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