Re: [LAU] [Android|OT?] CamSynth - Just an experiment

From: Patrick Shirkey <pshirkey@email-addr-hidden>
Date: Thu Jul 26 2012 - 00:57:35 EEST

On Wed, July 25, 2012 6:25 pm, Florian Paul Schmidt wrote:
> On 07/25/2012 04:31 PM, Neil C Smith wrote:
>> On 25 July 2012 15:01, SxDx <sed@email-addr-hidden> wrote:
>>> On my device (un-rooted) I have at best around 40ms.
>>> So for me, android is a no go for live stuff. ...
>>> We are in 2012 dear google, linux can go much lower than that,
>>> the devices out there are blazzingly fast, 40ms is insane.
>> Android 4.1 brings ~10ms latency *on the right hardware*
>>
>>> But well, that's life. This is "consumer electronics" after
>>> all. If angry bird works...
>> There are use cases for low latency audio on consumer devices, and I
>> think there is a push for a better performing audio stack.
>
> Note though, that in this example program, while the audio output is
> rendered in C, the final pass to the AudioDevice goes through java (the
> java code calls the JNI code to render into a buffer). But since under
> the android OS, there's just a linux system, it should be possible
> (maybe with root access and some hackery) to access the ALSA layer
> directly. And then it only depends on the audio hardware in the device.
>

Some people are reporting 512 period buffers are stable with 4.1 but the
claimed latency of ~10ms appears to be related more to the loading of
samples than realtime streaming. I.e jack would have a hard time still at
low latency. So far no one has reported better than 40ms for realtime
streaming. That is still wip.

You can install a cyanogenmod and get direct access to the alsa layer if
you want. I haven't seen any test results that have explored that option
for realtime latency yet. I can't do it because cyanogen mod doesn't run
on my devices.

I'm planning to get a new nexus at some point. I like the 10 inch form
factor for tablets.

IMO Google should have fired the person running the audio dev team for
screwing up so badly for three years running.

--
Patrick Shirkey
Boost Hardware Ltd
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Received on Thu Jul 26 04:15:02 2012

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