[Interest] QSoundEffect Categories on Android

[Pendleton, Corey]

Thanks for the reply Andrew!

That helps a lot. I did notice that QSoundEffect is initializing it's category to the string "game" and that it is managed by the Media stream volume on Android. That string is obviously different than the one being used by QAudioOutput which is probably why you're seeing different behavior.

We can try to switch to QAudioOutput in the meantime. Thanks again!
Corey

-----Original Message-----
From: Andrew Knight [mailto:andrew.knight at intopalo.com]
Sent: Saturday, November 07, 2015 2:45 AM
To: Pendleton, Corey <Corey.Pendleton at garmin.com>; interest at qt-project.org
Subject: Re: [Interest] QSoundEffect Categories on Android

Hi Corey,

On 11/07/2015 12:50 AM, Pendleton, Corey wrote:
> Does anyone have ANY information on how to use the category property of QSoundEffect on the Android platform? My hope is that somewhere strings map to Android audio streams, but I can't find it anywhere in the documentation or online, and I also can't find the platform specific implementation for Android.

Qt audio categories do map to Android audio streams (see
http://code.qt.io/cgit/qt/qtmultimedia.git/tree/src/plugins/opensles/qopenslesaudiooutput.cpp#n297)
- the platform-specific bits are in the OpenSL ES plugin, which is a different backend than used for e.g. QMediaPlayer on Android. For sending to the notification stream, for example, set the category to "notification". This works for me using QAudioOutput, which also has a category property.

That said, YMMV. I just tested this with QSoundEffect in Qt 5.5.1 and wasn't able to play a WAV (it works on Linux desktop w/ pulseaudio). The playback clearly through the same opensles engine, but fails when trying to create the OpenSL ES AudioPlayer (http://code.qt.io/cgit/qt/qtmultimedia.git/tree/src/plugins/opensles/qopenslesaudiooutput.cpp#n462).
I guess I'll need to debug a bit in there, as the engine doesn't print the return code of that OpenSL call.

So, my recommendation would be to avoid QSoundEffect and use QAudioOutput if you can. I will follow up on the issue and report a bug or submit a fix if I find one.

HTH,
Andrew

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