I want to apply a filter, specifically SWH's glame-bandpass-iir, to only one of several output channels.
I'm still stumped after looking at the examples listed below. I'm quite sure that
module-remap-sink are the solution to my needs. I cannot, however, understand the docs on
module-remap-sink. To keep things simple lets assume the goal is to have the
front L/R soundcard jack output unfiltered audio while the
rear L/R soundcard jack outputs filtered audio.
sink_name: The name for the new virtual sink. master: The name of the sink of which channels you're remapping. channels: Channel count of the new sink. channel_map: List of the channels that this sink will accept. master_channel_map: The channels in the master sink, where the channels listed in channel_map will be relayed to. channel_map and master_channel_map must have equal number of channels listed, because the channels will be mapped based on their position in the list, i.e. the first channel in channel_map will be relayed to the first channel in master_channel_map and so on. remix: Allow remixing of the mono or stereo streams to multiple channels (default is yes; set to "no" if you don't want the stereo stream to be up-mixed to all channels except subwoofer and channels named aux0-aux15).
The following is the filter sink that I want to use:
### LADSPA Sink .ifexists module-ladspa-sink.so .nofail load-module module-ladspa-sink sink_name=ladspa_out master=alsa_out plugin=bandpass_iir_1892 label=bandpass_iir control=660.0,440.0,2 .fail .endif
Could someone kindly explain how I accomplish
center jack on soundcard. Specifically, how do I fill this in?
load-module module-remap-sink filt_sink <?> 2 <?left,?right> <?m_left,?m_right> <?yes>
In case it is relevant, I'm using i945 onboard sound:
alsa.long_card_name = "Intel ICH7 with ALC850 at irq 17"
I've tried just about every configuration of both
~/pulse/default.pa that I can imagine without success. I have tried using various permutations of
module-alsa-sink to setup alsa with 4 or 6 channels named front-left,front-right,left,right,aux0-4,rear-left,rear-right and
module-combine-sink as well as the intended
module-ladspa-sink. Though the filter will work on one, two or four channels, it has been impossible to simultaneously get unfiltered output through any other channels.
I've asked on #pulseaudio on irc and been told that what I want is impossible with pulse alone. I'd really appreciate it if someone could point me to either a specific pulseaudio solution OR a solution with other tools.