02.08.2015 01:17, Rene Bartsch wrote:
Hi,
with
load-module module-pipe-sink format=s32le rate=96000 channels=8
channel_map=front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right
sink_name=brutefir.FCA610 file=/tmp/brutefir.FCA610
sink_properties='device.description="BruteFIR Behringer FCA610"'
a virtual sink can be created which pipes audio streams to a FIFO. The
drawback is that an external script has to start external processing of
the audio stream.
Is there any way to call a shell command from Pulseaudio and route a
virtual sink to STDIN of that shell-command?
No. But as this question is really about brutefir, not any arbitrary
program, here is an alternative way to start it. The drawback is that it
will not work after logging out and logging in again.
Install JACK.
In /etc/environment, put one line:
JACK_START_SERVER=1
In /home/user/.jackdrc, put one line:
/home/user/.jack_session.sh
In /home/user/.jack_session.sh, put this script, make it executable:
#!/bin/sh
jackd -r -d alsa -d hw:PCUSB -s -r 44100 -p 256 &
( sleep 4 ; brutefir ) &
In /home/user/brutefir_config, put (in this example, a separate filter
is applied to each channel for room-correction purposes):
sampling_rate: 44100;
#show_progress: false;
filter_length: 1024,64;
convolver_config: "/home/user/.brutefir_wisdom";
coeff "left" {
filename: "/home/user/.filter-left.pcm";
format: "FLOAT_LE";
};
coeff "right" {
filename: "/home/user/.filter-right.pcm";
format: "FLOAT_LE";
};
input "i_left", "i_right" {
device: "jack" { ports: "pulseaudio:front-left",
"pulseaudio:front-right"; };
channels: 2;
sample: "AUTO";
};
output "o_left", "o_right" {
device: "jack" { ports: "alsa_pcm:playback_1",
"alsa_pcm:playback_2"; };
channels: 2;
sample: "AUTO";
};
filter "f_left" {
inputs: "i_left"/9;
outputs: "o_left";
process: 0;
coeff: "left";
};
filter "f_right" {
inputs: "i_right"/9;
outputs: "o_right";
process: 0;
coeff: "right";
};
Finally, copy /etc/pulse/default.pa to
/home/user/.config/pulse/default.pa, and add there:
load-module module-jack-sink connect=no client_name=pulseaudio
Also, let me guess: are you trying to emulate virtual 7.1 sound on
headphones? Then, if your filter is shorter than 64 samples, then there
is no need to mess with brutefir at all. Just make a multichannel wav
file with the contributions of each input channel to the left output,
and provide it to module-virtual-surround-sink. The limitation to 64
samples can be easily patched out from module-virtual-surround-sink.
And finally: this is the third request to convolve PulseAudio output
with something arbitrary. Someone has to sit down and write a native
replacement for brutefir. Unfortunately, for me, this is not really
possible, because of the dayjob which keeps me busy 200% of time.
--
Alexander E. Patrakov
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