Re: Low latency efforts

Hi Nick,

This is definitely planned. Currently, the capture happens
on the very
first device (that is hw:0.0 from alsa point of view). But I
plan to
support all ALSA device registered.

Ideally, you could choose which one to use in the settings
menu,
although we also plan to support some kind of
"smart" default choice for
non-expert users. I don't know about Bluetooth audio devices
status
exactly, but USB will definitely work (I tested it already
with my usb
quikcam). If BT audio devices register an ALSA audio device
then it will
also work. If you have such equipment, it will be nice to
have feedback
from you when device settings is implemented.

Cheers,
Jean

buzz lightyear wrote:
> Hi Jean
> 
> Just a question relating to the alsa subsystem - I run
on linux and when
> you do a jmf detection for capture devices, all I get
is 'JavaSound
> audio capture'. If I run the Ekiga softphone, for
instance, I get a
> choice of usb and bluetooth devices for both audio and
video.
> 
> Do you think that you might eventually also add support
for device
> detection to your jmf_alsa library?
> 
> Cheers
> Nick
> 
> 
>> From: Jean Lorchat <lorchatsfc.wide.ad.jp>
>> Reply-To: devsip-communicator.dev.java.net
>> To: devsip-communicator.dev.java.net
>> Subject: [sip-comm-dev] Low latency efforts
>> Date: Mon, 12 Mar 2007 11:07:32 +0900
>>
>> Hi guys,
>>
>> I commited the java-part of the code for the new
ALSA-based datasource.
>> It is mostly a wrapper to libjmf_alsa.so that I
also committed in
>> lib/native/linux and does direct input/output with
the alsa subsystem.
>>
>> The main point in this datasource is that we are
able to capture data
>> chunks of 10ms length, shrinking the capture
latency overhead to only
>> 10ms ! In addition, downsampling is handled very
efficiently by the ALSA
>> library, and no more by JMF. Which means that we
are taking advantage of
>> the extremely optimized ALSA code.
>>
>> The C code will be commited later, in
src/native/linux/libjmf_alsa/ if
>> some people agree that it is a good place to put
it. By the way, the
>> target library name is libjmf_alsa.so hence the
name.
>>
>> There are still many things to be done on this
front, from enumeration
>> and GUI configuration to real latency tests. If
someone feels like
>> measuring latency using the new datasource and the
legacy JMF
>> datasource, we can discuss plans and so on.
>>
>> Cheers,
>>
>> Jean
>>
>>
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>>
> 
>
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>This is definitely planned. Currently, the capture
happens on the very
>first device (that is hw:0.0 from alsa point of view).
But I plan to
>support all ALSA device registered.
>
>Ideally, you could choose which one to use in the
settings menu,
>although we also plan to support some kind of
"smart" default choice for
>non-expert users. I don't know about Bluetooth audio
devices status
>exactly, but USB will definitely work (I tested it
already with my usb
>quikcam). If BT audio devices register an ALSA audio
device then it will
>also work. If you have such equipment, it will be nice
to have feedback
>from you when device settings is implemented.
>

Great news - believe me, you don't have to ask me to give
you feedback on 
this!

Cheers
Nick

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Hi Jean

Do you have any very approximate idea when you think you
will have the alsa 
device registry implemented? Each time I restart
sip-communicator the device 
settings keep getting switched around and I always have to
play around with 
alsa before I get the correct headset selected

Cheers

Nick


>From: Jean Lorchat <lorchatsfc.wide.ad.jp>
>Reply-To: devsip-communicator.dev.java.net
>To: devsip-communicator.dev.java.net
>Subject: Re: [sip-comm-dev] Low latency efforts
>Date: Mon, 12 Mar 2007 20:15:44 +0900
>
>Hi Nick,
>
>This is definitely planned. Currently, the capture
happens on the very
>first device (that is hw:0.0 from alsa point of view).
But I plan to
>support all ALSA device registered.
>
>Ideally, you could choose which one to use in the
settings menu,
>although we also plan to support some kind of
"smart" default choice for
>non-expert users. I don't know about Bluetooth audio
devices status
>exactly, but USB will definitely work (I tested it
already with my usb
>quikcam). If BT audio devices register an ALSA audio
device then it will
>also work. If you have such equipment, it will be nice
to have feedback
>from you when device settings is implemented.
>
>Cheers,
>Jean
>
>buzz lightyear wrote:
> > Hi Jean
> >
> > Just a question relating to the alsa subsystem - I
run on linux and when
> > you do a jmf detection for capture devices, all I
get is 'JavaSound
> > audio capture'. If I run the Ekiga softphone, for
instance, I get a
> > choice of usb and bluetooth devices for both audio
and video.
> >
> > Do you think that you might eventually also add
support for device
> > detection to your jmf_alsa library?
> >
> > Cheers
> > Nick
> >
> >
> >> From: Jean Lorchat <lorchatsfc.wide.ad.jp>
> >> Reply-To: devsip-communicator.dev.java.net
> >> To: devsip-communicator.dev.java.net
> >> Subject: [sip-comm-dev] Low latency efforts
> >> Date: Mon, 12 Mar 2007 11:07:32 +0900
> >>
> >> Hi guys,
> >>
> >> I commited the java-part of the code for the
new ALSA-based datasource.
> >> It is mostly a wrapper to libjmf_alsa.so that
I also committed in
> >> lib/native/linux and does direct input/output
with the alsa subsystem.
> >>
> >> The main point in this datasource is that we
are able to capture data
> >> chunks of 10ms length, shrinking the capture
latency overhead to only
> >> 10ms ! In addition, downsampling is handled
very efficiently by the 
>ALSA
> >> library, and no more by JMF. Which means that
we are taking advantage 
>of
> >> the extremely optimized ALSA code.
> >>
> >> The C code will be commited later, in
src/native/linux/libjmf_alsa/ if
> >> some people agree that it is a good place to
put it. By the way, the
> >> target library name is libjmf_alsa.so hence
the name.
> >>
> >> There are still many things to be done on this
front, from enumeration
> >> and GUI configuration to real latency tests.
If someone feels like
> >> measuring latency using the new datasource and
the legacy JMF
> >> datasource, we can discuss plans and so on.
> >>
> >> Cheers,
> >>
> >> Jean
> >>
> >>
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> >> To unsubscribe, e-mail: dev-unsubscribesip-communicator.dev.java.net
> >> For additional commands, e-mail: dev-helpsip-communicator.dev.java.net
> >>
> >
> >
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_____
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> >
------------------------------------------------------------
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