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How to turn on HDCP or SCMS in an audio playback app

There's an MSDN sample of how to turn on HDCP or SCMS in a playback app. The sample is loosely based on a test app I wrote, but there are still some rough edges. For example, the CMFAttributeImpl<T> template is not part of the SDK or the DDK. Also, Read More...
Posted Tuesday, November 10, 2009 11:07 AM by Maurits | 1 Comments
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Attachment(s): trustedaudiodrivers2.zip

Forcing Windows to install on a single partition

If you're installing Windows via a boot DVD, and you choose Custom, you have the option to rearrange partitions. I like use this to have each drive be one big partition. Windows 7 wants to set aside a 100 MB partition for something-or-other. I'm sure Read More...
Posted Friday, August 21, 2009 9:58 AM by Maurits | 1 Comments
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Tweaks I make every time I install Windows

As preparation for moving one of my machines from Vista to Windows 7, I'm compiling a list of all the little tweaks I like to make to machines that I use a lot: Boot from the Windows DVD. Delete all partitions; make each hard drive one big partition. Read More...
Posted Thursday, August 20, 2009 2:11 PM by Maurits | 7 Comments
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Minimal unsatisfiable regular expression, XPath query

Regular expressions are a tool for matching generic text. XPath queries are a tool for matching chunks of XML. Both are search technologies. When using search technologies it is occasionally quite useful to have a query that will never match anything Read More...
Posted Monday, June 01, 2009 11:08 AM by Maurits | 0 Comments
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Sample - WASAPI exclusive-mode event-driven playback app, including the HD Audio alignment dance

Sample WASAPI exclusive-mode event-driven playback app, including the HD Audio alignment dance and a version of the ac3.wav test tone with a "fact" chunk Read More...
Posted Friday, April 03, 2009 8:15 AM by Maurits | 5 Comments
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Attachment(s): play-exclusive.zip

Sample - WASAPI loopback capture (record what you hear)

Sample app that records what you hear using WASAPI loopback capture. Read More...
Posted Tuesday, December 16, 2008 9:28 AM by Maurits | 22 Comments
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Attachment(s): loopback-capture.zip

Sample - playing silence via WASAPI event-driven (pull) mode

WASAPI event-driven (pull-mode) sample for rendering silence Read More...
Posted Wednesday, December 10, 2008 10:30 AM by Maurits | 3 Comments
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Attachment(s): silence2.zip

xargs start

xargs.bat listing findstr /m IFoo | xargs start Read More...
Posted Tuesday, November 25, 2008 11:18 AM by Maurits | 3 Comments
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Sample: find out if your default audio playback and audio capture devices are on the same hardware

vbBretty on the audio forums asked how to tell if a given audio output and a given audio input were on the same physical audio card. Read More...
Posted Friday, June 13, 2008 4:53 PM by Maurits | 4 Comments
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Spot the Bug - IMFOutputSchema

I found a simple but nasty bug the other day in this implementation of the IMFOutputSchema interface. The symptoms: running this code outside of a debugger caused the app to crash. Running it under a debugger (to catch the crash) caused the app to run clean. Read More...
Posted Tuesday, May 27, 2008 9:38 AM by Maurits | 2 Comments
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Generating a sine wave with phase - answers

In a previous post I posed several mathematical problems... I'd like to go back and give some answers to them. To reiterate, we take a sine wave period and wrap it around a cylinder... Read More...
Posted Monday, March 31, 2008 1:56 PM by Maurits | 0 Comments
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Generating a sine wave with phase

Do the first exercise above - print out the original image, cut it out along the lines, and make a cylinder by connecting the short ends together. Rotate the cylinder through various orientations, paying particular attention to the location of the sine wave at all times. Read More...
Posted Friday, January 18, 2008 11:18 AM by Maurits | 0 Comments
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Generating a sine wave

w(i) = a sin(2πfi / s + ϕ) + c ...you'll burn through 2^32 samples in three hours, six minutes, twenty-five seconds. This is uncomfortably close to reasonable. So I fixed it - almost. Now we use a UINT64 for the sample offset. Well, it turns out that fixing that bug uncovered another bug. Exercise... what is the bug? Read More...
Posted Tuesday, January 08, 2008 1:29 PM by Maurits | 0 Comments
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The evolution of HRESULT_FROM_WIN32

As of Vista RTM... HRESULT_FROM_WIN32 is NO LONGER a macro! Read More...
Posted Friday, December 28, 2007 8:27 AM by Maurits | 0 Comments
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Calculating timeouts with a clock that wraps

// most of the time, these are the same. // which one will always work? // GetTickCount() - msAtStart > msTimeout // GetTickCount() - msTimeout > msAtStart // GetTickCount() > msAtStart + msTimeOut Read More...
Posted Friday, December 14, 2007 11:45 AM by Maurits | 0 Comments
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