I have the following lines in my /etc/pulseaudio/default.pa:
.nofail
load-module module-ladspa-sink sink_name=ladspa_out_sblive channels=2 master=alsa_output.pci_1102_2_alsa_playback_0 plugin=mbeq_1197 label=mbeq control=11.621622,10,4.594594,2.702703,0,0,-1.621622,-0.270270,-5.405406,-3.513514,-8.648648,-5.675676,-4.054054,1.351351,9.189189
load-module module-ladspa-sink sink_name=ladspa_out_usb channels=2 master=alsa_output.usb_device_41e_3010_noserial_if0_alsa_playback_0 plugin=mbeq_1197 label=mbeq control=11.621622,10,4.594594,2.702703,0,0,-1.621622,-0.270270,-5.405406,-3.513514,-8.648648,-5.675676,-4.054054,1.351351,9.189189
load-module module-ladspa-sink sink_name=ladspa_out_usb2 channels=2 master=alsa_output.usb_device_ffffffff_ffffffff_noserial_alsa_playback_0 plugin=mbeq_1197 label=mbeq control=11.621622,10,4.594594,2.702703,0,0,-1.621622,-0.270270,-5.405406,-3.513514,-8.648648,-5.675676,-4.054054,1.351351,9.189189
The 2 USB devices are actually the same device, but it gets 2 different names at different times. I think this is a hal issue. Also, the sink names are the names produced by module-hal-detect, but the sinks do appear, so I don't think this causes a problem other than the fact that I can't make the sink for the USB device appear when it is hotplugged.
My problem occurs whenever I try to play a sound through either of the ladspa_out sinks. I can move any stream to a ladspa_out sink on-the-fly and it plays quite nicely with no trouble. But if I start a stream at one of these sinks, pulseaudio dies. An investigation using pulseaudio -vv reveals the following error:
pulseaudio: pulsecore/sink.c:424: pa_sink_render: Assertion `PA_SINK_OPENED(s->thread_info.state)' failed.
Aborted
I only need to run pulseaudio again without killing it to start it, since it is already dead and not hung. However, in order to play the stream I moved to the ladspa_out sink without causing this error again, I need to kill pulseaudio and delete the stream from my .pulse/volume-restore.table. I also am unable to use the ladspa_out sinks as the default sink. If I try this, pulseaudio simply transparently resets the default sink to my soundblaster live card.
This error is 100% reproduceable whenever a stream is set to play through a ladspa-sink. Note that the lines I listed above don't wrap and that they require patching cli-command.c to allow lines of longer than 256 chars in default.pa.
