OpenSL ES limitation on EQ?

[pl bossart]

I noticed the following notice in the Java Equalizer class documentation
"NOTE: attaching an Equalizer to the global audio output mix by use of
session 0 is deprecated. " [1]

The same note was added for BassBoost and virtualizer. I am not sure I
understand this limitation and was wondering if there's a similar
limitation when using the Android implementation of OpenSL ES? Adding
an EQ on the output mix seems a fairly legit use case to me.
Thanks,
-Pierre

[1] http://developer.android.com/reference/android/media/audiofx/Equalizer.html

[mic _]

I don't know about OpenSL ES, but last time I checked in the AudioFlinger effects were added per playback thread (i.e. per output handle). Some vendors use a single playback thread for all playback (except A2DP), so there your effect will more or less be applied globally. Other vendors create new playback threads all the time.

/Michael

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