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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

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 | 25 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 | 4 Comments
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Attachment(s): silence2.zip

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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