Audio Recording on Windows Phone7.1

Audio recording from the windows phone mic uses the XNA framework.

So when I added the audio calls it requires a GameTimer update which has a FrameAction function. This wasn't already in my app when i started because I didn't use the XNA game template.

So I'll have to add one, But I already added a Tick update function for updates. I wonder if this will overlap in a bad way...

right now im using:

_timer = new DispatcherTimer();

_timer.Interval = TimeSpan.FromMilliseconds(30);

_timer.Tick += new EventHandler(Tick);

_timer.Start();

for updates. so, possibly, i can switch that to being a GameTimer instead? giving that a try...

So, it looks like the dispatchTimer can be replaced with GameTimer and the functions in it do the same thing

_timer = new GameTimer();

_timer.UpdateInterval = TimeSpan.FromMilliseconds(30);

_timer.Update += Tick;

_timer.Start();

This is the new code, GameTimer() replaced DispatcherTimer() and UpdateInterval replaces Interval, and Tick was replaced with Update and rather than a new EventHandler i just add the name of the function thats going to be updated. Then I start the timer.

Does the same thing it seems.

BUT now im getting this crappy error:

A first chance exception of type 'System.InvalidOperationException' occurred in Microsoft.Xna.Framework.dll

An unhandled exception of type 'System.InvalidOperationException' occurred in Microsoft.Xna.Framework.dll

Additional information: FrameworkDispatcher.Update has not been called. Regular FrameworkDispatcher.Update calls are necessary for fire and forget sound effects and framework events to function correctly. See http://go.microsoft.com/fwlink/?LinkId=193853 for details.

seems like I need to add something... a short bit of reading I find I need to call it manually for some reason...

in my tick I added:

void Tick(object sender, GameTimerEventArgs e)

{

   FrameworkDispatcher.Update(); // this was needed?

   ...

}

And that seems to have fulfilled what i need for calling the framework dispatcher... whatever that is.

so now it looks like i can get a buffer filled with mic stream data bytes. Golly, in the last four days I've only written about 480 lines of code. but every method was something I had to learn about.

hopefully, someone, other than me, found a line of code in this blog useful.