Volume control causes trouble high priority thread

A few weeks ago, when I was finishing my "Flix" app and adjust the priorities of the threads, I noticed that the wire audio high priority interfered with the volume buttons of the PlayBook. Specifically, it could support you on a volume button and nothing would happen, at least not for a second or two. It was as if the priority of the audio thread was so high that it prevented the OS to respond to the pressure on the hardware button to the user.

This week, the behavior is quite different: the volume controls work fine, but as soon as you press on one of them, the audio wire starts to fight, and the audio gets all the "poppy/static ' y '.

The really strange thing is that even though the notification of change of volume disappears from the screen, the sound remains ' poppy/static ' y ', as if the volume permanently change event interferes with the audio wire.

I was wondering if the OS was lowering the priority of the thread on an event of volume change, but I think I have excluded that... when I ask the audio thread for its priority, remains at 63 before and after the events of volume change.

So it is obviously very confusing... How the hell a single volume change event could interfere with the audio thread of the application until the end of the execution of the application? (Even if the application gets a "break" due to need extra buffer audio and video, as soon as the audio continues, it is always static'y)

The other thing that may or may not be related, it's that last week my PlayBook prompted me that there is an update of the OS.  The strange thing is that the version of the update seems to be exactly the same as the version of the operating system I had, and it was only 3 MB. I can't help but wonder if this is somehow related to the change of behavior that I see.

Any help would be most appreciated.

Thank you!

Daniel

I finally understood how to prevent the volume control to cause audio problems.

Here's the long answer:

-My app plays WAV files back to back. There was a slight "couture" in the audio that I tried to get rid of.

-A point I tried removed calls to snd_pcm_open and snd_mixer_open whenever a WAV file has been played, thinking that maybe something to do with the small gap in the audio.

-I didn't know at the time, but I think it's when editing of the volume begun resulting in distortions on the audio.

-Distortions are prevented by listening to events of volume change, and when it is received, ensure what I call snd_pcm_open and snd_mixer_open to the next WAV file playback.

Tags: BlackBerry Developers

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