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Windows 7's resampling sucks, How can it be improved?
googlebot
post Feb 9 2011, 20:30
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Playback over WASAPI must match the sample rate of the output device. Thus applications must supply their own resampling if the playback rate does not match. Most applications don't do this but just employ MME or DirectSound, which provide transparent resampling for non-matching rates.

Since some of my content is 44.1 kHz and some 48 kHz I used to set the output rate to 192 kHz so that all audio had to be upsampled. With good software resampling and a cheap onboard codec this could, in theory, even improve the overall result. But the opposite was true. Today I couldn't longer ignore the impression that the resampled output sounded somewhat muffled and did some measurements.

You can view the result here. The upsampled output (44.1 -> 192 kHz) suffers from quite a HF roll-off in comparison to pure 44.1 kHz output.

In Windows XP the SRC quality could be adjusted. I can't find anything comparable in Windows 7. Does anyone know more?

This post has been edited by googlebot: Feb 9 2011, 20:33
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Cavaille
post Feb 9 2011, 23:43
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QUOTE ([JAZ] @ Feb 9 2011, 20:41) *
D) Please, consider using adequate words in this forum. "This sucks" or "This 0wns" are not adequate words.

This is not to be meant in any way harmful but since when did this forum become snotty? Besides, he didn´t attack a person, he "insulted" a resampling engine. Which is another matter IMO. IF he would have attacked a person, then I´d write the sentence you wrote, JAZ. Now you can write "Oh, but he attacked the programmer of this resampling engine." Well, in that case... people from Microsoft got used to it over the years, won´t you say?

QUOTE (saratoga @ Feb 9 2011, 21:56) *
Were you able to ABX that? 1dB of rolloff at 17kHz seems like it would be difficult enough with test tones, let alone real music.

I waited for exactly that sentence upon first reading the original post. I mean, we ABX a lot - mp3 for example. Numerous tests around here have shown that people cannot percept missing frequencies above roughly 15 kHz. I´m afraid this thread will get sorted into the "mp3-bashing-audiophile-snake-oil" sort.

QUOTE (googlebot @ Feb 9 2011, 23:11) *
QUOTE
In exclusive mode, the client can choose to open the stream in any audio format that the endpoint device supports. In shared mode, the client must open the stream in the mix format that is currently in use by the audio engine (or a format that is similar to the mix format). The audio engine's input streams and the output mix from the engine are all in this format.

Exactly. Figuratively speaking, WASAPI is nothing more but a revamped XP Audio Kernel with a few added traits ASIO had established.

To get back to the original post, I find it disturbing that Windows 7 actually resamples that bad. I always was under the impression that the resampling improved from XP to 7. Guess I was wrong. Have you measured any other things beside frequency response? Thinks like distortions? I wouldn´t be surprised if something gets aliased back into the audible range.


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- googlebot   Windows 7's resampling sucks   Feb 9 2011, 20:30
- - [JAZ]   A) WASAPI doesn't force any player to resampl...   Feb 9 2011, 20:41
|- - googlebot   QUOTE ([JAZ] @ Feb 9 2011, 20:41)...   Feb 9 2011, 21:14
- - saratoga   QUOTE (googlebot @ Feb 9 2011, 14:30) Sin...   Feb 9 2011, 21:56
|- - googlebot   It's hard to ABX the different paths directly ...   Feb 9 2011, 22:11
- - Roseval   WASAPI in exclusive mode send the output straight ...   Feb 9 2011, 23:04
|- - googlebot   QUOTE (Roseval @ Feb 9 2011, 23:04) WASAP...   Feb 9 2011, 23:11
- - Cavaille   QUOTE ([JAZ] @ Feb 9 2011, 20:41)...   Feb 9 2011, 23:43
|- - dv1989   QUOTE (Cavaille @ Feb 9 2011, 22:43) QUOT...   Feb 10 2011, 00:10
- - [JAZ]   Are you telling me that when I have set 24bits 96K...   Feb 9 2011, 23:49
|- - googlebot   QUOTE ([JAZ] @ Feb 9 2011, 23:49)...   Feb 10 2011, 00:07
- - C.R.Helmrich   http://www.hydrogenaudio.org/forums/index....st...   Feb 9 2011, 23:50
- - SCOTU   Is there any reason the OS' resampling even ma...   Feb 9 2011, 23:51
- - soulsearchingsun   Did you take the effects of different recontructio...   Feb 9 2011, 23:56
- - googlebot   I'll be away until tomorrow night. If you guys...   Feb 10 2011, 00:25
- - GeSomeone   @googlebot , I do not fully understand why you...   Feb 10 2011, 00:42
|- - googlebot   QUOTE (GeSomeone @ Feb 10 2011, 00:42) I ...   Feb 11 2011, 00:00
- - Cavaille   QUOTE (googlebot @ Feb 10 2011, 00:07) Ho...   Feb 10 2011, 00:47
- - googlebot   @GeSomeone That's possible. It didn't test...   Feb 10 2011, 00:50
- - SebastianG   I also don't think -1 dB at 17 kHz and -3 dB a...   Feb 10 2011, 11:28
|- - Notat   QUOTE (SebastianG @ Feb 10 2011, 03:28) I...   Feb 10 2011, 16:43
|- - googlebot   I am well familiar with the technical details of r...   Feb 10 2011, 20:46
|- - Woodinville   QUOTE (Notat @ Feb 10 2011, 08:43) Have y...   Nov 5 2011, 08:32
- - soulsearchingsun   QUOTE (soulsearchingsun @ Feb 9 2011, 23...   Feb 10 2011, 11:45
- - lvqcl   http://blogs.msdn.com/b/matthew_van_eerde/...-pull...   Feb 10 2011, 22:17
|- - Greg   QUOTE (lvqcl @ Feb 10 2011, 13:17) http:/...   Apr 17 2011, 08:51
|- - lvqcl   QUOTE (Greg @ Apr 17 2011, 11:51) How exa...   Apr 17 2011, 12:34
|- - Greg   QUOTE (lvqcl @ Apr 17 2011, 03:34) QUOTE ...   Apr 17 2011, 19:30
- - googlebot   Interesting. Looks like it should, just not like w...   Feb 10 2011, 23:32
- - [JAZ]   Couple of things... It looks like foobar2000 impl...   Feb 11 2011, 01:05
- - googlebot   Thank you for the update [JAZ] and my apologies fo...   Feb 11 2011, 01:53
- - googlebot   The problem is mostly solved. It seems to be a rea...   Feb 11 2011, 03:20
|- - soulsearchingsun   QUOTE (googlebot @ Feb 11 2011, 03:20) Th...   Feb 11 2011, 13:05
|- - googlebot   QUOTE (soulsearchingsun @ Feb 11 2011, 13...   Feb 11 2011, 13:09
- - googlebot   Maybe we can get an additional confirmation? Perso...   Feb 11 2011, 13:13
|- - soulsearchingsun   QUOTE (googlebot @ Feb 11 2011, 13:13) Ma...   Feb 11 2011, 13:20
- - googlebot   Full stop. It was just RMAA that fucked up. And wi...   Feb 11 2011, 14:19
- - Cavaille   QUOTE (googlebot @ Feb 11 2011, 14:19) Fu...   Feb 11 2011, 15:15
- - greynol   What about your initial suspicion about muffled so...   Feb 11 2011, 19:51
|- - googlebot   QUOTE (greynol @ Feb 11 2011, 19:51) What...   Feb 11 2011, 20:27
- - hellokeith   Googlebot, This thread was actually helpful, in t...   Feb 13 2011, 04:06
- - jaro1   This area has also my interest, however the proble...   Apr 17 2011, 11:20
- - lvqcl   I don't have it, but it was like the attached ...   Apr 17 2011, 19:57
- - whitejason   QUOTE (googlebot @ Feb 9 2011, 20:30) Pla...   Jun 27 2011, 18:41
- - meeky   Not sure if this is related, but Microsoft have co...   Nov 5 2011, 07:05
- - lvqcl   from the abovementioned thread: QUOTE Media Founda...   Nov 5 2011, 07:36
|- - hellokeith   QUOTE (lvqcl @ Nov 5 2011, 00:36) Media F...   Nov 5 2011, 10:01
|- - benski   QUOTE (lvqcl @ Nov 5 2011, 02:36) from th...   Nov 6 2011, 18:24
- - lvqcl   http://blog.szynalski.com/2009/11/17/an-au...-7/#c...   Nov 5 2011, 10:47
- - C.R.Helmrich   I just checked the optional updates available for ...   Nov 5 2011, 11:28
|- - Batman321   QUOTE (C.R.Helmrich @ Nov 5 2011, 05:28) ...   Nov 5 2011, 19:01
- - Roseval   I'm afraid audio has priority zero at Microsof...   Nov 5 2011, 13:33
|- - googlebot   QUOTE (Roseval @ Nov 5 2011, 14:33) I...   Nov 5 2011, 21:09
- - Roseval   There are a couple of media players for OSX doing...   Nov 6 2011, 10:59
|- - Juha   So, you need dedicated playback software for to do...   Nov 6 2011, 11:52
||- - bennetng   I have to agree that win7's resampling has som...   Nov 6 2011, 13:11
|- - googlebot   QUOTE (Roseval @ Nov 6 2011, 11:59) There...   Nov 6 2011, 15:19
- - Roseval   Correct. iTunes doesn't support automatic samp...   Nov 6 2011, 13:03
- - LordWarlock   For whoever it may interest, there is now a hotfix...   Mar 9 2012, 19:49
|- - C.R.Helmrich   Thanks a million, Lord! Trying it right now. E...   Mar 9 2012, 21:21
|- - extrabigmehdi   QUOTE (LordWarlock @ Mar 9 2012, 18:49) F...   Mar 10 2012, 00:07
||- - andy o   QUOTE (extrabigmehdi @ Mar 9 2012, 16:07)...   Jun 20 2012, 00:34
|- - Woodinville   QUOTE (LordWarlock @ Mar 9 2012, 10:49) F...   Mar 10 2012, 01:51
|- - markanini   QUOTE (Woodinville @ Mar 10 2012, 02:51) ...   Jun 20 2012, 06:41
- - hellokeith   Why a hotfix and not an update?   Mar 10 2012, 10:17
- - db1989   Cross-linking for future reference: “Windows 7/200...   Aug 29 2012, 18:22


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