[haiku-bugs] Re: [Haiku] #1351: aliasing is heared with playback 44.1kHz files on 48kHz system sample rate
- From: "stippi" <trac@xxxxxxxxxxxx>
- Date: Sat, 09 Oct 2010 12:16:03 -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 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.
To pulkomandy: The Resamplers are already C++ objects which can hold
arbitrary members. The same resampler object is used for a given
channel/stream, so why not just implement what you propose? However I
don't think that the audible artifacts are in fact caused by the problem
you describe. It's just too obvious. I fully understand the problem, I
just believe the effects should be more subtle. Something else is probably
going on in addition to what you describe.
--
Ticket URL: <http://dev.haiku-os.org/ticket/1351#comment:15>
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