Hello,I watched the google/android video the other day and I was very surprised
of the basic recommendations that were given to developers:- use native
sampling rate (don't hardcode sampling rate, request it from the device)
- use native buffering (don't hardcode it. But then maybe use double or
quadruple buffering in the app, because your CPU is not fast enough)- compile
for Release and enable Neon- don't log at every audio callback- don't
lock/allocate in the audio callback- use less than 20% of the CPU time
I mean, really? Is this what was lacking so far in Android "professional"
audio? These are the basics of real-time programming, as Ross teaches us
http://www.rossbencina.com/code/real-time-audio-programming-101-time-waits-for-nothing
and of general programming (compiler optimization, Release mode).
The useful bits of information I got are:- simulate screen taps every second so
that the CPU is always kept to full clock and no energy save. >> surely a
workaround. As the people speaking have worked on Android for the past three
years I am sure they could have supported this from the Android API- current
target is to achieve 10ms roundtrip>> Which means that not even the nexus 6p
does it at the moment.- a device for measuring roundtrip latency (using a
teensy and a custom app, 22:48) https://github.com/google/walt
I was not very impressed by the quality of the video production overall, as it
features:
- a physician introduced as "someone that cares all about numbers"- a calibre
(22:17)- table of latency results which does not have any sense (23:12)
Best,Giulio
From: grh <g...@mur.at>
To: music-dsp@music.columbia.edu
Sent: Wednesday, 25 May 2016, 11:57
Subject: Re: [music-dsp] Android related audio group / mailing list?
Hallo!
Thanks Nuno, it was a great demo ;)
LG
Georg
On 2016-05-25 12:46, Nuno Santos wrote:
> Hi George,
>
> I would be interested in such a community as well. Specially regarding
> audio performance. We have recently released DRC (one of the apps that
> has been featured on Google I/O Android High Performance Audio) and we
> are mostly interested in squeezing performance out of it. It is
> incredible the performance differences between iOS and Android. The DSP
> code is shared among both and I still have glitch problems in Android
> powerful devices.
>
> One option could be creating a slack channel.
>
> Regards,
>
> Nuno Santos
> Founder / CEO / CTO
> www.imaginando.pt <http://www.imaginando.pt>
> +351 91 621 69 62
>
>> On 25 May 2016, at 11:36, grh <g...@mur.at <mailto:g...@mur.at>> wrote:
>>
>> Hallo music-dsp list!
>>
>> Sorry for being off topic, but does someone know an active discussion
>> group / mailing list about android audio?
>> (There is quite a lot of progress lately, see for example [1])
>> 5 years ago a list was announced here [2], which does not seem to be
>> active anymore ...
>>
>> We just created a simple android audio editor [3] and would be very much
>> interested into a discussion of common infrastructure like audio
>> plugins/effects (like SAPA from Samsung) or copy/paste between audio apps.
>> I think that would be important for the audio ecosystem on Android.
>>
>> Thanks for any hints,
>> LG
>> Georg
>>
>> [1]: https://www.youtube.com/watch?v=F2ZDp-eNrh4
>> [2]:
>> http://music-dsp.music.columbia.narkive.com/zbYgicxy/new-android-audio-developers-mailing-list
>> [3]:
>> https://play.google.com/store/apps/details?id=com.auphonic.auphonicrecorder
>>
>> --
>> auphonic - audio post production software and web service
>> http://auphonic.com
>>
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>> music-dsp@music.columbia.edu
>> https://lists.columbia.edu/mailman/listinfo/music-dsp
>
>
>
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--
auphonic - audio post production software and web service
http://auphonic.com
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