dotfiles

Commit: f12c65ad08ecfb452ca65bb4f6085ed89c174646
Parent: a2a578e0cc101b0a0c5e0c0d8df40a6bbd3a127f
Author: Randy Palamar
Date:   Sat,  4 Sep 2021 14:47:11 -0600

allow desktop audio to be recorded

this duplicates the output to an alsa loopback device which can be
recorded from.

Diffstat:
M
.config/alsa/asoundrc
 | 
51
+++++++++++++++++++++++++++++++++++++++++++++++----

1 file changed, 47 insertions(+), 4 deletions(-)
diff --git a/.config/alsa/asoundrc b/.config/alsa/asoundrc
@@ -10,6 +10,12 @@ pcm.!default {
 	}
 }
 
+pcm.dup {
+	type plug
+	slave.pcm pcm.mdev
+	route_policy "duplicate"
+}
+
 pcm.output {
 	type dmix
 	ipc_key 1024
@@ -23,6 +29,43 @@ pcm.output {
 	}
 }
 
+pcm.loop {
+	type dmix
+	ipc_key 1025
+	slave {
+		pcm "hw:Loopback,0,0"
+		buffer_size 8192
+		format S16_LE
+		period_size 1024
+		period_time 0
+		rate 48000
+	}
+}
+
+pcm.loopgain{
+	type softvol
+	slave.pcm pcm.loop
+	control.name "LoopGain"
+	min_dB -3.0
+	max_dB 30.0
+}
+
+pcm.mdev {
+	type multi
+	slaves.a.pcm pcm.output
+	slaves.a.channels 2
+	slaves.b.pcm pcm.loopgain
+	slaves.b.channels 2
+	bindings.0.slave a
+	bindings.0.channel 0
+	bindings.1.slave a
+	bindings.1.channel 1
+	bindings.2.slave b
+	bindings.2.channel 0
+	bindings.3.slave b
+	bindings.3.channel 1
+}
+
 # alias actual mic card to mic
 pcm.mic {
 	type hw
@@ -45,7 +88,7 @@ pcm.dsnooper {
 # give mic output a volume control
 pcm.micvol {
 	type softvol
-	slave.pcm pcm.output
+	slave.pcm pcm.dup
 	control.name "MicVol"
 }
 ctl.MicVol {
@@ -56,20 +99,20 @@ ctl.MicVol {
 # software volume
 pcm.softvol {
 	type softvol
-	slave.pcm pcm.output
+	slave.pcm pcm.dup
 	control.name "SoftVol"
 }
 
 # mpd volume control
 pcm.mpd {
 	type softvol
-	slave.pcm pcm.output
+	slave.pcm pcm.dup
 	control.name "MPD"
 }
 
 # mpv volume control
 pcm.mpv {
 	type softvol
-	slave.pcm pcm.output
+	slave.pcm pcm.dup
 	control.name "MPV"
 }