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List:       linux-audio-dev
Subject:    Re: [LAD] [ANN] GUI toolkit and 2 audio applications, also for Android
From:       "W.Boeke" <w.boeke () upcmail ! nl>
Date:       2014-02-06 9:24:22
Message-ID: 52F354C6.5000703 () upcmail ! nl
[Download RAW message or body]

Oops! The missing xml files are included now. Please download the new tar.gz file, \
because the correct AndroidManifest.xml file is containing one essential line which \
makes the cummunication with the  USB keyboard more robust.

The Nexus7 indeed is classified as non-low latency, although the criterium for this \
is not quite clear. Anyhow, the audio buffer is 512 samples, as reported by  \
getProperty(AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER) This is not bad, it will \
yield a max audio latency of 11.6 ms. The rest of the audio chain is \
hardware-accellerated (using OpenSL). In older versions of the Android OS \
(pre-KitKat) the main latency  originated from the USB connection to the MIDI \
keyboard, and the overall latency was worse than under Linux. But now, the persieved \
Android latency is better than the Linux one! (at least on my system).

Wouter Boeke

On 02/05/2014 11:34 PM, Pedro Lopez-Cabanillas wrote:
> Nice work! Thanks for sharing. The graphics are somewhat crude, but this
> surely will be improved in future releases.
> 
> You forgot to include on both projects CT-synth and CT-farfisa the files
> build.xml  and AndroidManifest.xml, so it is not possible to build the apps
> out of the box for Android.  Nevertheless I've managed to test them on my
> Nexus7. The latency is not bad at all, but it could be better. On this device,
> I've never got better results with my own tests. The interesting logcat line
> is:
> 
> I/TestNative(  769): java: low latency=false sr=44100 bs=512
> 
> This is after including in the app manifest an explicit request:
> <uses-feature android:name="android.hardware.audio.low_latency"
> android:required="true" />
> 
> Regards,
> Pedro
> 
> 

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