5 Feb
2014
5 Feb
'14
3:57 p.m.
Hi,
This is an announcement for a GUI toolkit, which works for Android tablets as well as for
the Linux desktop. This means that all widgets are touch-friendly, such that values can be
observed also when
you put your thick fingers on the sensitive areas.
The library is accompanied with 2 audio applications: a (more or less) classic synthesizer
and a (not so classic) organ. Both are polyphonic. My intention was to create applications
that you can use
at home with a regular MIDI controller, and outdoors with an on-screen keyboard or with a
mini MIDI controller.
Android is traditionally plaged with a long audio latency, but the latest version (KitKat)
is really good in this respect. Also the USB interface is fast. IMHO, these musical
instrument applications
are really playable now.
Notice that you can build (if you want so) an application for Linux only, or for Android
only. The source code as well as an introduction can be found at:
http://members.chello.nl/w.boeke/ct-gui/index.html
Comments are welcome.
Regards,
Wouter Boeke
5 Feb
5 Feb
11:33 p.m.
New subject: [ANN] GUI toolkit and 2 audio applications, also for Android
On Wednesday 05 February 2014 15:57:50 W.Boeke wrote:
Hi,
This is an announcement for a GUI toolkit, which works for Android tablets
as well as for the Linux desktop. This means that all widgets are
touch-friendly, such that values can be observed also when you put your
thick fingers on the sensitive areas.
The library is accompanied with 2 audio applications: a (more or less)
classic synthesizer and a (not so classic) organ. Both are polyphonic. My
intention was to create applications that you can use at home with a
regular MIDI controller, and outdoors with an on-screen keyboard or with a
mini MIDI controller.
Android is traditionally plaged with a long audio latency, but the latest
version (KitKat) is really good in this respect. Also the USB interface is
fast. IMHO, these musical instrument applications are really playable now.
Notice that you can build (if you want so) an application for Linux only, or
for Android only. The source code as well as an introduction can be found
at: http://members.chello.nl/w.boeke/ct-gui/index.html
Comments are welcome.
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
6 Feb
6 Feb
10:24 a.m.
New subject: [ANN] GUI toolkit and 2 audio applications, also for Android
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
3939
days inactive
3940
days old
linux-audio-dev@lists.linuxaudio.org
2 comments
2 participants
participants (2)
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Pedro Lopez-Cabanillas -
W.Boeke