I just posted an answer to a similar question about fast track at
"Questions of fastmixer" which should appear soon
https://groups.google.com/d/topic/android-porting/3sTfcy-bXLE/discussion
About your other question, synchronized record is a new feature and not
everything is using it.
On Tuesday, September 4, 2012 11:34:34 PM UTC-7, guoguo wrote:
>
> We found both ToneGenerator and SoundPool used fast track. But from my
> investigation, the fast track is not helpful to shorten the audio play
> latency for such short sounds. Below is the picture I drew for fast Mixer.
> All fast track audios were still dumped to codec through buffers in
> AudioFlinger and ALSA.
>
> Audio latency = one period latency in AudioFlinger + Alsa latency.
>
> It is same as that on ICS.
> So what the fast track for?
>
> And for audio recording trigger feature, I didn't find that the
> libstagefright used it so that the SoundRecorder.apk not use this feature,
> too, right?
>
> Looking forward to your replies, thanks a lot!
>
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