Jack

From Arnout Engelen

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[edit] jack and flash

[edit] libflashsupport-jack

Tool for routing jack audio though jack:

Installing:

  • apt-get install libtool
  • ./bootstrap.sh
  • make
  • backup /usr/lib/libflashsupport*
  • sudo make install

Unfortunately this causes somewhat 'skipping' audio, and also makes Firefox quite unstable, with memory errors like: 

*** glibc detected *** /usr/lib/firefox-3.0.10/firefox: realloc(): invalid next size: 0xb05d1178 ***

terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
Aborted

[edit] pulseaudio

Ubuntu currently doesn't carry pulseaudio-module-jack (neither does 64studio), so i had to compile that first:

  • apt-get source pulseaudio
  • apt-get build-dep pulseaudio
  • cd pulseaudio_<tab>
  • ./configure --with-jack
  • cd src
  • make module-jack-sink.la
  • cp .libs/module-jack-sink.so /usr/lib/pulse-0.9/modules
  • create a jackd.pa as described here
  • start jack
  • start pulseaudio
  • start firefox
  • open youtube
  • enjoy :)

[edit] Problems

Sometimes when using qjackctrl, qsynth and solfege (which outputs via timidity via jack i think, not sure), I get the following: 

pp: cannot clean up byte from graph wait fd (Resource temporarily unavailable)
zombified - calling shutdown handler
14:20:08.347 Shutdown notification.
14:20:08.349 Client deactivated.
14:20:08.353 JACK is stopping...
jack main caught signal 15
**** alsa_pcm: xrun of at least 3.497 msecs
subgraph starting at qsynth timed out (subgraph_wait_fd=10, status = 0, state = Triggered)
no message buffer overruns
14:20:09.095 JACK was stopped successfully.

Then I have to restart jackd, and the qsynth output port is missing, it comes back when i hit 'restart' in qsynth, after which I have to re-attach the keyboard to fluid

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