6 Feb
2014
6 Feb
'14
10:24 a.m.
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