Sound system developement question
Robert Sjonøy
roberth.sjonoy at gmail.com
Mon Sep 17 11:21:35 UTC 2012
This is irrelevent, we are talking about jitter with the bitperfect parameter enabled.
Regards,
Roberth Sjonøy
On 17. sep. 2012, at 12:09, Ian Smith <smithi at nimnet.asn.au> wrote:
> On Sat, 15 Sep 2012 14:53:41 +0200, Hans Petter Selasky wrote:
>
>> There are some sysctls which tell how oversampling is done:
>>
>> hw.snd.feeder_rate_quality
>
> Hans and all,
>
> That's good to know, so I checked mine (default):
>
> hw.snd.feeder_rate_quality: 1
> hw.snd.feeder_rate_quality: sample rate converter quality (0=low .. 4=high)
>
> and so set it to 4. I'm just listening to a ~192kbps VBR MP3 radio
> stream, and hear no perceptible difference (probably not surprising),
> nor does top show any apparent difference in cpu or interrupt rates:
>
> last pid: 2172; load averages: 0.16, 0.25, 0.21 up 12+19:41:12 19:54:06
> 150 processes: 2 running, 132 sleeping, 16 waiting
> CPU: 14.0% user, 0.0% nice, 5.3% system, 7.8% interrupt, 72.9% idle
> Mem: 292M Active, 243M Inact, 161M Wired, 25M Cache, 85M Buf, 17M Free
> Swap: 2048M Total, 170M Used, 1877M Free, 8% Inuse
>
> PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
> 11 root 1 171 ki31 0K 8K RUN 43.2H 90.97% idle
> 1740 smithi 1 46 0 203M 143M select 509:57 3.56% Xorg
> 1852 smithi 1 50 0 35756K 10544K select 310:36 2.88% gkrellm
> 16115 smithi 5 59 0 298M 211M ucond 153:18 1.37% seamonkey-bin
> 12 root 16 -60 - 0K 128K WAIT 96:09 1.37% intr
> 1844 smithi 6 44 0 18812K 7064K select 230:56 0.10% xmms
>
> .. via xmms, on an 1133MHz P3-M running at 733MHz, 8.2-RELEASE i386.
>
> Need I reset the sound system to have that take effect? If so, how?
>
> cheers, Ian
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