I hope that someone here can help with a problem we're having with the newer versions of the alsa-lib. We are using the ladspa interface with alsa to use a pitch-shifting plugin. It worked fine with earlier versions of the alsa lib, but with the newer versions it produces no sound output. The last version of alsa that we know works (and is the "stable" version we're using in our system at the moment because of it) is 0.9.0rc6. Shortly after this version, the ladspa stuff was broken (segfault, see the thread starting with:
http://www.mail-archive.com/[EMAIL PROTECTED]/msg07847.html
). The segfault was fixed, but we've not been able to get audio out of alsa-lib when using the plugin since.
I've been trying to track this down, but I'm out of ideas of what/where to fiddle with. We really want to move to more current versions of alsa, as working with out-of-date versions is causing us other headaches, but we can't till we fix this problem.
One interesting thing...alsa uses an older version of the ladspa.h header. Replaced w/ a more current version and no change though.
I've played with our configuration in asound.conf and no joy. I've examined the code in src/pcm/pcm_ladspa.c and nothing pops up at me. I'm currently looking at the source for the plugin, but nothing obvious is showing itself.
I'd be happy to fix this myself (or get a patch from someone), but I'm out of ideas of where to look or even how to go about debugging this particular problem. Maybe it's a configuration problem; Maybe a problem with pcm_ladspa.c; Maybe a problem with something else that just happened to change around that time. Any ideas of where I can look or how I can debug this issue?
Last known working version: 0.9.0rc6
Currently working with: 0.9.6 and a cvs snapshot from last Thursday (broken in both)
Plugin is from: http://plugin.org.uk/releases/0.4.2/
In our snd_pcm_open call, our device is: "plug:pd"
The plugin we're using is: /lib/ladspa/am_pitchshift_1433.so
our asound.conf file looks like:
pcm.pd
{
type ladspa
slave.pcm "plughw:0,0"
path "/lib/ladspa"
plugins
[
{
label amPitchshift
input
{
controls [ 1.189207 3 ]
}
}
]
}Thanks, - Steve
------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
