[linux-audio-dev] ac3jack - realtime AC3 stream encoder for JACK

[Benno Senoner]

Seems very cool !
(don't have the time nor the gear to test it but I'm making some 
comments anyway)


A few questions:
1)
on your page you say that on some soundcards jack blocks the SPDIF out 
thus you need
to have two cards to use jack and AC3 out.
Would it make sense to add AC3 support directly to jack ?
Basically integrating ac3dec's SPDIF out within jack.
That way the user could use the capure audio ports and AC3 at the same time
(with jack exposing the 5.1 ports).

2)
is the quality of the encoder you are using at par/comparable with 
commercial
 windows AC3 encoders ?
how much CPU is used for full realtime 5.1 encoding -> AC3 spdif out on 
let's
say a 2GHz box (or give figures on your own box please).

3)
Any idea what the latency figures look like when you pipe in a realtime 
audio signal into
jack-ac3 and the audio gettting out via SPDIF ?
Does ac3 encoding similar framesizes to mp3 (which means a minimum of 
50msec delay).
In short, with these virtual "AC3 jack ports", would it be possible to 
attach a jack-capable softsynth
and play it lively ? (I guess not).


cheers,
Benno


Jesse Chappell wrote:

>Introducing the initial release of ac3jack,  bringing you realtime
>AC3 stream encoding of any JACK audio.
>
> http://essej.net/ac3jack/
>
>  
>