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January 2007 - Posts

The Wavedev2 ForceSpeaker API

This is just a quick note describing the behavior of the MM_WOM_FORCESPEAKER API built into the wavedev2 wave driver. One issue in Smartphone devices is determining where to route ringtones and other high-priority notifications. This is driven by two Read More...
Posted Tuesday, January 16, 2007 4:54 PM by Andy Raffman | 13 Comments

Multichannel Audio in Windows CE

Most of the infrastructure is in place to support multichannel audio in Windows CE, although the number of components that we ship to actually implement it is limited. In this blog I'll cover the varying types of multichannel audio and what features are Read More...
Posted Tuesday, January 16, 2007 9:55 AM by Andy Raffman | 10 Comments

Windows CE Audio: What does the term "mixer" mean?

In the Windows CE audio stack, the term "mixer" is used to refer to a couple of different, unrelated components. This blog will try to define each of them and how they differ. There are usually three different contexts in which "mixer" is used: the "Software Read More...
Posted Friday, January 12, 2007 12:14 PM by Andy Raffman | 4 Comments

FAT Filesystem Performance Issues for DVR

Time to switch gears a bit away from audio... First a minor digression into what we were building (which some people may find interesting, and this is still a Multimedia blog ;-). Then I'll get to how this involves the FAT filesystem. One of the major Read More...
Posted Thursday, January 04, 2007 2:33 PM by Andy Raffman | 3 Comments

The Wavedev2 Gainclass Implementation

Goals Back in 2000, while we were defining the requirements for the Windows Mobile Smartphone audio design, one of our goals was to mute most audio applications while a phone call is in progress. A secondary issue is the fact that most of the time the Read More...
Posted Thursday, January 04, 2007 10:24 AM by Andy Raffman | 12 Comments

The Wavedev2 MIDI Implementation

The wavedev2 wave driver sample code includes a fairly primitive MIDI synthesizer as part of the source code. The reason for its relative simplicity dates back to the question: "What can you implement in two weeks with no additional ROM hit to run on Read More...
Posted Wednesday, January 03, 2007 11:46 PM by Andy Raffman | 9 Comments

Windows CE Audio Driver Samples

This is my first blog post, so please feel free to leave feedback with questions or comments, especially if you feel I've gotten anything wrong or if there's some critical bit of infomation missing. Windows CE currently ships audio driver samples descended Read More...
Posted Wednesday, January 03, 2007 8:24 PM by Andy Raffman | 8 Comments
 
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