Line input

4 replies [Last post]
1455
User offline. Last seen 36 weeks 3 days ago. Offline
Joined: 2014-06-26
Posts:

I had a strange problem after installation Ardour from SVN (Ubuntu 14.04): line input not connecting to Ardour. Only a microphone and I heard loud noise immediately after the addition of audio tracks (setup ALSA: alsa mixer: https://cloud.mail.ru/public/6f02bd10da6f/alsa.png).
I opened JackCtl and clicked "disconnect all". Then I restart my computer and saw PulseAudio JACK Source:
https://cloud.mail.ru/public/020d68391499/pulse1.png
https://cloud.mail.ru/public/163943fd2ba9/pulse2.png
Then I run Ardour and now line input is connected and noise disappeared.
The next start computer was successful, but PulseAudio JACK Source did not appear.
https://cloud.mail.ru/public/acadf53b60f5/ardour1in.png
https://cloud.mail.ru/public/759b63b112f8/ardour2in.png
Is this normal?

James Brierley
User offline. Last seen 13 weeks 2 days ago. Offline
Joined: 2012-06-01
Posts:

PulseAudio JACK Source/Sink indicate the bridge which allows PulseAudio, which is the ‘consumer’ audio routing service used on Linux-based systems, to connect to JACK. This is provided by the module-jack-source and module-jack-sink PulseAudio modules.

You don’t *need* PulseAudio to route through JACK, so your second computer is perfectly normal and fine as long as you can hear what you’re doing when you want to! It’s just convenient in some instances. For instance, my FireWire audio interface is by definition not supported by ALSA but I am able to bridge applications through PulseAudio to jack-ffado using the above modules.

Cheers,
James

paul
paul's picture
User offline. Last seen 19 min 49 sec ago. Offline
Joined: 2006-03-16
Posts:

(note: the next release of the Linux kernel will have ALSA support for firewire audio devices)

allank
allank's picture
User offline. Last seen 4 weeks 4 days ago. Offline
Joined: 2006-12-07
Posts:

Paul, do you have any more info on that?
I haven't seen much info on the ffado-user list. Do you know if the existing devices will all be ported across to ALSA?

paul
paul's picture
User offline. Last seen 19 min 49 sec ago. Offline
Joined: 2006-03-16
Posts:

I am not following developments closely. The alsa-devel list is where discussion would be occuring.