linuxaudio.org

On Wed, July 25, 2012 6:25 pm, Florian Paul Schmidt wrote:

quoted text
> On 07/25/2012 04:31 PM, Neil C Smith wrote:

>> On 25 July 2012 15:01, SxDx  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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