I found that whenever activate() or deactivate() are called in pcm_ladspa.c, a sanity check is performed before calling the function. EXCEPT in one instance. When I added the sanity check to that instance, the segfaults disappeared and all of the plugins that I tried worked. Here is a patch for alsa-lib/src/pcm/pcm_ladspa.c:
--- pcm_ladspa.orig 2003-06-13 13:34:58.000000000 -0700
+++ pcm_ladspa.c 2003-06-13 13:32:02.000000000 -0700
@@ -412,7 +412,8 @@
return -EINVAL;
}
list_add_tail(&instance->list, &plugin->instances);
- plugin->desc->activate(instance->handle);
+ if (plugin->desc->activate)
+ plugin->desc->activate(instance->handle);
if (plugin->policy == SND_PCM_LADSPA_POLICY_DUPLICATE) {
err = snd_pcm_ladspa_connect_plugin_duplicate(plugin, &plugin->input, instance, idx);
if (err < 0) {
For anyone that's interested, my asound.conf looks like this:
pcm.pitch
{
type ladspa
slave.pcm "plughw:0,0"
path "/usr/local/lib/ladspa"
plugins
[
{
label amPitchshift
input
{
controls [ 1.059463 3 ]
}
}
]
}There's one other problem that I haven't been able to solve yet. When I use the latest ALSA library, I get error messages that complain about the version whenever I try to play pcm through the plugin:
ALSA lib dlmisc.c:107:(snd_dlsym_verify) unable to verify version for symbol ladspa_descriptor
Compiling --with-versioned= yes or no makes no difference in this case.
The only way I have been able to get around this problem is to use an old ALSA library (I'm currently using 0.9.0rc6). I have tried many versions of the library. The problem seems to have started with CVS version 1.11 of pcm_ladspa.c. Version 1.10 uses dlopen(), dlclose(), and dlsym(), while version 1.11 uses snd_dlopen(), snd_dlclose(), and snd_dlsym(). This appears to be the only difference between the two versions. Any help on this issue would be greatly appreciated, as I'd like to use the most up-to-date library.
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