On 03/25/2013 08:57 AM, Ian Malone wrote:
On 25 March 2013 06:13, David Henningsson
<[email protected]> wrote:
On 03/23/2013 12:11 PM, Toby Smithe wrote:
becomes impractical, with drops and latency problems. A while ago, I
looked into implementing Opus compression for the network streams, but
never had a chance. I think Opus would make the ideal codec because it
is very flexible, recently ratified as an Internet standard, and can be
remarkably lightweight (according to the official benchmarks).
By the way, aside from the concerns about using a lossy codec in my
other email, Opus would be exactly the right choice, though you
haven't pointed out a major reason: it's explicitly designed for low
latency.
In doing these network audio, I might also be able to move on to
auxiliary tasks like improving the GUI tools for this use-case.
Do you think this might work?
I think it sounds interesting. Networked audio (and its latency) is indeed
something people complain about every now and then.
But Opus is just a codec, right? Or does it also specify how it is actually
transferred over the network (UDP/TCP etc)?
Are you planning to extend our RTP module with Opus support?
In short; Opus might be one piece of the puzzle to get reliable low-latency
streaming, but could you also outline how you think about the network stack
part?
There is a RTP transport defined for Opus,
http://tools.ietf.org/html/draft-spittka-payload-rtp-opus though you
don't have to use it.
Ok, interesting.
My question to Toby is really how this is integrating with PulseAudio
and the network stack.
Today we have several methods of talking between servers, the most
common one being the native protocol, which is TCP based. So the
question is really if Toby is trying to improve the native protocol with
the Opus codec, and how that will be accomplished?
Or if the plan is to start with the existing RTP module (which is
separate from the native protocol) and implement Opus support there?
Or to start something completely separate?
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
_______________________________________________
pulseaudio-discuss mailing list
[email protected]
http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
