[wdmaudiodev] Re: API used by Sounds/Program Events
- From: Vincent Wang <vincent0wang@xxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sat, 9 Nov 2013 15:36:04 +0800
Hi Matthew and Frank,
Thanks for confirming.
And as you observed, there is no issue, when there is other stream on.
VincentFrom: Matthew.van.Eerde@xxxxxxxxxxxxx
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: API used by Sounds/Program Events
Date: Fri, 8 Nov 2013 20:18:45 +0000
Yup, I can repro.
It seems to be specific to PlaySound. PlaySound internally calls winMM
(waveOutOpen etc.), but when I use winMM directly I can hear
the full sound.
I can also get it to play the full sound if I have silence.exe running in the
background (or any other audio stream.)
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matthew van Eerde
Sent: Friday, November 8, 2013 9:24 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: API used by Sounds/Program Events
The Sound control panel basically just calls PlaySound(filename, NULL,
SND_ASYNC | SND_FILENAME).
Does it repro if you have other audio playing (e.g., silence?) Try running
silence.exe in the background:
http://blogs.msdn.com/b/matthew_van_eerde/archive/2008/12/10/sample-playing-silence-via-wasapi-event-driven-pull-mode.aspx
I will see if I can repro internally.
From:
wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]
On Behalf Of Frank Yerrace
Sent: Friday, November 8, 2013 8:35 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: API used by Sounds/Program Events
Yes, these go through different paths, although these paths do ultimately
together before reaching the driver.
It sounds to me like you may have discovered a bug in the code that plays
sounds from the Sounds page of the Sound control panel.
Frank Yerrace
Microsoft
From:
wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]
On Behalf Of Vincent Wang
Sent: Friday, November 8, 2013 1:20 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] API used by Sounds/Program Events
Hi all,
In Win 8.1, I finding different behavior for .wav file playback using the
Windows Media Player and Sounds/ Program Events (responsible for playing back
system notification).
I wonder are they calling different API with different buffer management.
When playing back a short wav clip, and record digitally from the sound card
digital mix, I'm getting a much shorter clips from the Program Events player
compared to WMP.
I can see part of the input wav is chopped (due to buffer management?) The
number of samples chopped is also dependent on the sampling frequency.
Thanks
Best Regards
Vincent
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