Re: [ecasound] schedule effects

Hy julien,

my kernel version is 2.6.24-24-rt #1 SMP PREEMPT RT Wed Apr 15 18:09:25 UTC
2009 i686 GNU/Linux.

laurent@email-addr-hidden-inspiron1525:~$ jackd --version
jackd version 0.109.2 tmpdir /dev/shm protocol 22

It would be great to have a configuration wizard for jackd searching and
finding the best available configuration for the hardware.
A tool that can check your setup for every piece of configuration needed for
jackd.

Indeed, i'm not new to linux. But i learn every day about linux and software
packages available ! I've already tried to use ardour with jack audio apps
but i abandonned because of xruns problems. I get cracky records ...

I decided to find a lighter solution that feet my needs such as ecasound
(for audio recording), midish (MIDI sequencer/filter) and timidity (MIDI to
WAV) that are command line tool (can be used for batch processing and live
session).

What i would like to do is to transform a MIDI file to a wav file (using
timidity batch mode). Once i get the playback track, i need the transport
information (time mn/sec/msec measure and beat information) when playing in
order to know when to apply effects with ecasound on the recorded microphone
track.

Once i built the ecasound effect-preset for the microphone track, i record
the session using ecasound and can hear the effects on microphone track
while performing.

I know that to do this, i need jackd otherwise, using alsa device, it will
surely introduce to much latency. If using alsa device, effects should be
calculated in batch mode.

I need to resolve the xruns problem in order to use jack.

Three options have been mentioned to optimize my setup:
  - build a custom kernel (do i have hardware that require a tuned RT kernel
?)
  - change interrupt priorities
  - change the windowing system (for instance gnome) to a lighter one (fvwm,
... ?)

I don't know how to set priority in interrupts (is this possible ?)
(graphic i915 cards, audio Intel card and USB audio card).
/proc/interrupts
           CPU0
  0: 522 IO-APIC-edge timer
  1: 4753 IO-APIC-edge i8042
  8: 7 IO-APIC-edge rtc
  9: 0 IO-APIC-fasteoi acpi
 12: 1056 IO-APIC-edge i8042
 14: 96997 IO-APIC-edge libata
 15: 0 IO-APIC-edge libata
 16: 3 IO-APIC-fasteoi ohci1394, i915@email-addr-hidden:0000:00:02.0
 18: 356346 IO-APIC-fasteoi uhci_hcd:usb1, uhci_hcd:usb4,
ehci_hcd:usb7
 19: 7390 IO-APIC-fasteoi uhci_hcd:usb2, uhci_hcd:usb5, HDA Intel
 20: 29 IO-APIC-fasteoi ehci_hcd:usb3, uhci_hcd:usb6
 21: 12 IO-APIC-fasteoi sdhci:slot0
218: 7 PCI-MSI-edge iwl3945
219: 60407 PCI-MSI-edge eth0
220: 59687 PCI-MSI-edge ahci
NMI: 0 Non-maskable interrupts
LOC: 14279337 Local timer interrupts
RES: 0 Rescheduling interrupts
CAL: 0 function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
SPU: 0 Spurious interrupts
ERR: 0
MIS: 0

Kindest regards,
Laurent

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Received on Sat Jun 6 04:15:01 2009