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"Memory Leak" when using the Vista Audio API notification routines

We recently got an internal report from someone using the internal audio notification APIs that they were leaking memory and they wanted to help from us debugging the problem. I took a look and discovered that the problem was a circular reference that Read More...
Posted Wednesday, October 24, 2007 2:40 PM by LarryOsterman | 17 Comments

Hey, my custom shutdown sound got cut off (or didn't play). What's up?

Chris Pirillo had an interesting blog post the other day with the rather uninformative title of " Windows Vista Sound Problems ". He has a reader who built a shutdown sound that is almost 2 minutes long, and that reader is upset that the system isn't Read More...
Posted Thursday, August 02, 2007 4:08 PM by LarryOsterman | 19 Comments

The last change for the cheesy OSD application - preventing volume recursion.

Yesterday , at the close of my article about adding notifications support to the cheesy OSD application, I mentioned that there was one remaining problem. The problem is actually a big deal - as it's written right now, the application can't filter out Read More...
Posted Friday, March 23, 2007 10:12 AM by LarryOsterman | 13 Comments

Fun with the endpoint volume interfaces - closing the loop

Yesterday, I added support for metering to the cheesy OSD application, today I want to add in the one thing that's been missing: notification of external volume changes. The good news is that once again, it's pretty easy to add support. All you need to Read More...
Posted Thursday, March 22, 2007 9:10 AM by LarryOsterman | 6 Comments

Fun with the endpoint volume interfaces - let's add metering...

Yesterday I posted a quick&dirty OSD (complete with cheesy text graphics). Today I'm going to add support for metering to the application. Start with yesterdays application and add (this is the routine that actually implements the meter): struct TimerContext Read More...
Posted Wednesday, March 21, 2007 9:12 AM by LarryOsterman | 3 Comments

Other fun things to do with the EndpointVolume interfaces

Last week I posted a code snippet that showed how to change the master volume in Vista . That snippet doesn't really show the coolness that exists within the IAudioEndpointVolume interface. One of my favorite features is the support for OSD's (On Screen Read More...
Posted Tuesday, March 20, 2007 9:27 AM by LarryOsterman | 12 Comments

How do I change the master volume in Windows Vista

It's actually easier in Vista than it was in XP. For Vista, we recognized that one of the key customer scenarios was going to be setting the master volume, and since we'd removed the old mechanism that was used to set the volume, we knew we had to provide Read More...
Posted Tuesday, March 06, 2007 9:15 AM by LarryOsterman | 32 Comments

A peek behind the beep

Or rather, a peek behind system sounds. Windows 3.1 (I think - it might have been Win95) introduced the concept of "application events" to Windows (I prefer to call them system sounds). But how do these events actually work? It turns out that documentation Read More...
Posted Tuesday, January 24, 2006 4:35 PM by LarryOsterman | 10 Comments

Setting volume on audio CDs with MCI

So I got an email from a reader yesterday asking: How do you set the volume of an audio stream coming from a CD? I found an old piece of code that used mciSendCommand with some parameters to do so, but my compiler cannot find the "MCI_SET_VOLUME" constant. Read More...
Posted Thursday, October 06, 2005 9:30 AM by LarryOsterman | 8 Comments

New Audio APIs for Vista

In an earlier post , I mentioned that we totally re-wrote the audio stack for Windows Vista. Today I want to talk a bit about the APIs that came along with the new stack. There are three major API components to the Vista audio architecture: Multimedia Read More...
Posted Friday, September 23, 2005 11:18 AM by LarryOsterman | 17 Comments

What's an audio endpoint?

One of the parts of the audio engine rework was a paradigm shift in how audio devices are addressed. Before Vista, audio devices were enumerated (more or less) by the KSCATEGORY_AUDIO PnP devinterface that exposed a Wave filter. The big problem with this Read More...
Posted Wednesday, September 21, 2005 1:34 PM by LarryOsterman | 9 Comments

What's up with Audio in Windows Vista?

Steve Ball (the GPM for the MediaTech group (of which Windows Audio is a part)) discussed some of these changes in the Windows Audio Channel 9 video , but I'd like to spend a bit more time talking about what we've done. A lot of what I'm discussing is Read More...
Posted Monday, September 19, 2005 10:05 AM by LarryOsterman | 39 Comments

Windows Audio Channel9 Video is up.

Robert Scoble's posted the audio team Channel9 video , in it, the GPM for our group goes over what the Windows Core Audio team's been doing for the past three or so years, and lays out some of the stuff that we've got in store for Vista. I am super psyched Read More...
Posted Friday, September 16, 2005 10:43 AM by LarryOsterman | 15 Comments

Playing audio CDs, part 11 - Why isn't my sample ready for prime time?

As I mentioned in my previous post , the code I've provided will play back audio CDs. But it's not ready for prime time yet. There are four major problems with the code. First off, the error handling isn't 100% up-to-snuff. In particular, there are several Read More...
Posted Friday, May 06, 2005 2:34 PM by LarryOsterman | 7 Comments

Playing Audio CDs, part 10 - Glitch Free, Low Memory

So yesterday I wrote an example that removed the glitching from my DAE CD playback example. But it had some major drawbacks - for example, it consumed huge amounts of system memory, and had absolutely horrendous latency problems - if you wanted to pause Read More...
Posted Thursday, May 05, 2005 12:19 PM by LarryOsterman | 9 Comments
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