[wdmaudiodev] Re: [DETECTED AS SPAM] Re: AVStream audio buffer size==latency
- From: Richard Lince <Richard.Lince@xxxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 25 Sep 2013 09:05:17 +0000
Hello,
500ms is specified as the Duration in the Advanced settings of the DS Default
DirectSound Device when connected as a renderer to the audio source in
GraphEdt.exe.
If you then change the Source Filter 'Latency' tab in the Filter properties,
the number above can be changed by its default 500ms to the amount set in the
Latency tab (IAMBufferNegotiation).
However, this is not the case for MMAPI applications, the latency is minimal
and not a problem. Unfortunately most users still interface with the avstream
driver/filter via a DirectShow interface :(
Thanks,
Richard Lince,
Software Engineer.
Datapath Ltd - Bemrose House - Bemrose Park - Wayzgoose Drive - Derby - DE21 6XQ
T: 01332 294 441 | F: 01332 290 667 | www.datapath.co.uk
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: 24 September 2013 18:01
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [DETECTED AS SPAM] [wdmaudiodev] Re: AVStream audio buffer
size==latency
Richard Lince wrote:
> Hello, I have written an audio driver using the avstream framework, not
> portclass.
> All is good except for the audio latency, 500ms by default.
Where do you see this number?
> An addition observation is that no matter what is set by the working DS
> IAmBufferNegotiation interface in GraphEdt.exe, the buffer size is always
> 0x6e4 (10ms latency in size) when the process handler is called.
This is usually the case. The audio subsystem tries to keep 10ms in flight.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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