[haiku-bugs] Re: [Haiku] #1351: aliasing is heared with playback 44.1kHz files on 48kHz system sample rate
- From: "stargatefan" <trac@xxxxxxxxxxxx>
- Date: Sun, 10 Oct 2010 05:52:09 -0000
#1351: aliasing is heared with playback 44.1kHz files on 48kHz system sample
rate
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Reporter: nutela | Owner: pulkomandy
Type: bug | Status: assigned
Priority: normal | Milestone: R1
Component: Kits/Media Kit | Version: R1/pre-alpha1
Resolution: | Keywords:
Blocked By: | Has a Patch: 0
Platform: x86 | Blocking:
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Comment (by stargatefan):
Replying to [comment:15 stippi]:
> To stargatefan: The system works just fine in principle. Audio
applications *can* do their own mixing and can have a single master
output, if they so chose. Clockwerk and I think any other current
BeOS/Haiku audio app is using such a setup today. There is nothing wrong
with, and it's in fact required to have a global system mixer. And since
sound cards have mostly one sound input, it's only logical to drive it in
the highest frequency that the hardware allows (which is what Haiku
currently does). Most movies use 48 kHz, most music is 44.1 kHz -- so what
should one pick? In theory, the mixer could be improved to switch the
audio hardware to the highest sampling rate of current mixer inputs. If
there is only one input, use the sampling rate of that one. I don't think,
however, that with a proper resampling implementation, it would make any
practical difference. In fact it would just make the code more complicated
and probably introduce audible hickups when there is already one mixer
input playing and another one is added which causes a switch to a higher
sampling rate.
>
> Really, fixing the resampling is all that needs to be done here.
>
Well in certain case resampling is the only option as hardware may
only support one type of input and files are in another. no argument
there. My concern is that mixer is really becoming more then it needs to
be. whiles it great the I can watch 6 videos and listen to dozens of mp3's
and or wav files all at the same time. Its not a very practical design for
the end user.
Try listening to 2 different songs as the same time. Its just not
something the human brain would want to do.
the ASIO model of mixer handling I think we would be a big improvement
in many ways. alot of it is already in the mixer now for the most part.
The overall design of ASIO looks to be based in some part on the Be mixer,
which was great in its day.
My thought is that to some degree mixer might be getting to complex.
the application should have the job of file conversion or the mixer master
output. pick a resolution " of one thats available in the hardware and end
user selectable" and just go to that regardless of what comming in.
but applications need to be able to acess that hardware " or have acess
to it" down the road if DAW "digital audio workstations" are ever to take
root in this OS. I sure hope they do. Would be a huge userbase gain for
haiku.
so your down to the WDM and ASIO rivalry to some degree when the
internal API dictates a specific behavioor that the application developer
may not want, nor the end user.
BTW thats not a knock against the OS. It works great as it is now.
My thought it. Pass the selection of sample rate to the application.
this leaves the API open to DAW developers. also putting in a bootstrap
type of mode for audio hardware control and IO blocking. Highly recomened.
--
Ticket URL: <http://dev.haiku-os.org/ticket/1351#comment:16>
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