[pulseaudio-discuss] pulseaudio seems to resample without need

[moebius]

Well, I'm french and when reading my last message again it seems 
strangely not really friendly ; well it's absolutely not my purpose and 
I want to thank you again for paying attention to my problem...but my 
english is not good enough to translate correctly my thoughts :)

cordialement,


Le 28/04/2012 16:14, moebius a écrit :
> Bonjour,
>
> Well, I can obtain, with pulseaudio, what I need : I just have to set
> emu card at 48000 but it's not a good thing because when using alsa
> directly or jack, I need to reset at 44100 in alsamixer ; it would be
> nice to just set once sample rate at 44100.
>
> I don't understand exactly what to ask at alsa developer because I don't
> really want alsa doing what pulseaudio want ; it seems better that
> pulseaudio detect the correct sample rate of the card and then open the
> session at right sample rate, isn't it ?
>
> I can't study what makes the difference because I'm not a programer.
>
> cordialement,
>
>
> Le 28/04/2012 14:28, Tanu Kaskinen a écrit :
>> On Sat, 2012-04-28 at 13:10 +0200, moebius wrote:
>>> Bonjour,
>>> I've tried to post in the list but my message doesn't appear ; perhaps
>>> there's a problem with the attached fille....so I post directly to you,
>>> sorry for the inconvenient
>>
>> Yes, the largish attachment may have caused your message to go to the
>> moderation queue.
>>
>>> Bonjour,
>>>
>>> Thank for your answer.
>>>
>>> In fact, after changing samplerate in alsamixer and test immediat
>>> result, I've reseted pulseaudio and test for changes again with no
>>> success.
>>> Now, after your mail and before testing, I've copied daemon.conf in
>>> ~./pulse/ and decomment and modify the sample rate line :
>>>
>>> ; default-sample-format = s16le
>>> default-sample-rate = 44100
>>> ; default-sample-channels = 2
>>>
>>> here are my soundcards ;the ensonic one is just here for driving midi
>>> devices ; for audio, I use the EMU one :
>>>
>>> cat /proc/asound/cards
>>> 0 [AudioPCI ]: ENS1371 - Ensoniq AudioPCI
>>> Ensoniq AudioPCI ENS1371 at 0xd880, irq 16
>>> 1 [EMU0404 ]: Audigy2 - E-mu 0404b PCI [MAEM8852]
>>> E-mu 0404b PCI [MAEM8852] (rev.0,
>>> serial:0x40021102) at 0xdc00, irq 19
>>>
>>> NB : the motherboard soundcard is disabled.
>>>
>>> I join the pulse log
>>> It contains this strange line :
>>>
>>> ( 0.064| 0.000) I: [pulseaudio] alsa-util.c: Device surround41:1
>>> doesn't support 44100 Hz, changed to 48000 Hz.
>>
>> This explains why you have to set the internal rate to 48000 when using
>> PulseAudio. If Jack and aplay can open the device in the 44100 mode, I
>> don't know why PulseAudio fails to do that. Presumably the device
>> opening sequence is done a bit differently in PulseAudio than e.g. in
>> aplay (I think the setup function calls can be called with different
>> order, and some Alsa drivers behave differently depending on the order).
>> So if you have the motivation, you could study what makes the
>> difference.
>>
>> You could also ask on the alsa-devel mailing list if the driver
>> maintainer could improve the driver so that it would set the internal
>> rate automatically correctly when the device is opened. So if PulseAudio
>> opens the device in the 48000 mode, then the driver should set the
>> internal rate automatically to 48000 Hz.
>>
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