From 140e45bc021d6c868a366a11f667b026b74607d3 Mon Sep 17 00:00:00 2001
From: dvs1
Date: Thu, 3 Oct 2024 17:29:25 +1000
Subject: First commit.
---
jackscanall | 326 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 326 insertions(+)
create mode 100755 jackscanall
(limited to 'jackscanall')
diff --git a/jackscanall b/jackscanall
new file mode 100755
index 0000000..24d87df
--- /dev/null
+++ b/jackscanall
@@ -0,0 +1,326 @@
+#!/usr/bin/env luajit
+
+--[[
+This is part of the JackOnAllDevices project, JOAD for short.
+
+The purpose is to scan for all ALSA / asound audio devices, and hook them
+all up to JACK. Then it starts up JACK, and hooks up any joysticks it
+finds as MIDI controllers.
+
+
+Alas ~/.asoundrc doesn't understand ~ or $HOME, or even "try the current
+directory" it seems. So you have to hard cade the path. Make sure your
+~/.asoundrc or /etc/asoundrc includes something like this -
+
+
+
+
+Run this once as root to create that file, and each time you need to
+change your devices.
+
+
+TODO - Leave it running, and hotplug ALSA / asound audio devices.
+ a2jmidid takes care of hotplugging MIDI devices.
+ Though I think I still need to deal with hotplugged joysticks.
+
+NOTE - Seems both ALSA and JACK are per user.
+
+]]
+
+
+-- CHANGE these to suit.
+local asoundrcPath = '/var/lib/JOAD'
+local asoundrc = 'asoundrc'
+
+
+
+-- This APT stuff was copied from apt-panopticon.
+local APT = {}
+
+APT.readCmd = function(cmd)
+ local result = {}
+ local output = io.popen(cmd)
+ if nil ~= output then
+ for l in output:lines() do
+ table.insert(result, l)
+ end
+ end
+ return result
+end
+
+
+APT.exe = function(c)
+ local exe = {status = 0, result = '', lines = {}, log = true, cmd = c .. ' ', command = c}
+
+ function exe:log()
+ self.log = true
+ return self
+ end
+ function exe:Nice(c)
+ if nil == c then
+ self.cmd = 'ionice -c3 nice -n 19 ' .. self.cmd
+ else
+ self.cmd = self.cmd .. 'ionice -c3 nice -n 19 ' .. c .. ' '
+ end
+ return self
+ end
+ function exe:timeout(c)
+ -- timeout returns a status of - command status if --preserve-status; "128+9" (actually 137) if --kill-after ends up being done; 124 if it had to TERM; command status if all went well.
+ -- --kill-after means "send KILL after TERM fails.
+ if nil == c then
+ self.cmd = 'timeout --kill-after=10.0 --foreground 42.0s ' .. self.cmd
+ else
+ self.cmd = 'timeout --kill-after=10.0 --foreground ' .. c .. ' ' .. self.cmd
+ end
+ return self
+ end
+ function exe:also(c)
+ if nil == c then c = '' else c = ' ' .. c end
+ self.cmd = self.cmd .. ';' .. c .. ' '
+ return self
+ end
+ function exe:And(c)
+ if nil == c then c = '' else c = ' ' .. c end
+ self.cmd = self.cmd .. '&&' .. c .. ' '
+ return self
+ end
+ function exe:Or(c)
+ if nil == c then c = '' end
+ self.cmd = self.cmd .. '|| ' .. c .. ' '
+ return self
+ end
+ function exe:noErr()
+ self.cmd = self.cmd .. '2>/dev/null '
+ return self
+ end
+ function exe:wait(w)
+ self.cmd = self.cmd .. '&& touch ' .. w .. ' '
+ return self
+ end
+ function exe:Do()
+ --[[ "The condition expression of a control structure can return any
+ value. Both false and nil are considered false. All values different
+ from nil and false are considered true (in particular, the number 0
+ and the empty string are also true)."
+ says the docs, I beg to differ.]]
+ if true == self.log then D(" executing - " .. self.cmd .. "") end
+ --[[ Damn os.execute()
+ Lua 5.1 says it returns "a status code, which is system-dependent"
+ Lua 5.2 says it returns true/nil, "exit"/"signal", the status code.
+ I'm getting 7168 or 0. No idea what the fuck that is.
+ local ok, rslt, status = os.execute(s)
+ ]]
+ local f = APT.readCmd(self.cmd, 'r')
+ -- The last line will be the command's returned status, collect everything else in result.
+ self.status = '' -- Otherwise the result starts with 0.
+ self.result = '\n'
+ self.lines = f
+ for i,l in ipairs(f) do
+ self.result = self.result .. l .. "\n"
+ end
+ f = APT.readCmd('echo "$?"', 'r')
+ for i,l in ipairs(f) do
+ self.status = tonumber(l)
+ if (137 == self.status) or (124 == self.status) then
+ print("timeout killed " .. self.status .. ' ' .. self.command)
+ E("timeout killed " .. self.status .. ' ' .. self.command)
+ elseif (0 ~= self.status) then
+ print("status |" .. self.status .. '| ' .. self.command)
+ E("status |" .. self.status .. '| ' .. self.command)
+ end
+ end
+ return self
+ end
+ function exe:fork(host)
+ if nil ~= host then self.cmd = self.cmd .. '; r=$?; if [ $r -ge 124 ]; then echo "$r ' .. host .. ' failed forked command ' .. string.gsub(self.cmd, '"', "'") .. '"; fi' end
+ self.cmd = '{ ' .. self.cmd .. '; } &'
+ if true == self.log then D(" forking - " .. self.cmd .. "") end
+ os.execute(self.cmd)
+ return self
+ end
+ return exe
+end
+
+
+
+local Cards = {}
+
+print('Scanning for audio devices.')
+local cards = APT.exe('ls -d1 /proc/asound/card[0-9]*'):noErr():Do()
+for i,l in ipairs(cards.lines) do
+ local f, e = io.open(l .. '/id', "r")
+ if nil == f then print("Could not open " .. l .. '/id') else
+ Cards[l] = {path = l, name = f:read("*a"):sub(1, -2), devs = {}, captureDevs = {}, playbackDevs = {}}
+ if "Loopback" ~= Cards[l]['name'] then
+ Cards[l]['capture'] = APT.exe('ls -d1 ' .. l .. '/pcm[0-9]*c*'):noErr():Do()
+ for j,c in ipairs(Cards[l]['capture'].lines) do
+ local n = c:match(".*pcm(%d+).*")
+ Cards[l]['captureDevs'][j] = n
+ Cards[l]['devs'][n] = n
+ print("\tFound capture device: " .. Cards[l]['name'] .. "\tDEVICE: " .. Cards[l]['captureDevs'][j] .. ' ' .. n)
+ end
+ Cards[l]['playback'] = APT.exe('ls -d1 ' .. l .. '/pcm[0-9]*p*'):noErr():Do()
+ for j,p in ipairs(Cards[l]['playback'].lines) do
+ local n = p:match(".*pcm(%d+).*")
+ Cards[l]['playbackDevs'][j] = n
+ Cards[l]['devs'][n] = n
+ print("\tFound playback device: " .. Cards[l]['name'] .. "\tDEVICE: " .. Cards[l]['playbackDevs'][j] .. ' ' .. n)
+ end
+ end
+ end
+end
+
+APT.exe('mkdir -p ' .. asoundrcPath):Do()
+local a, e = io.open(asoundrcPath .. '/' .. asoundrc, "w")
+if nil == a then print("Could not open " .. asoundrcPath .. '/' .. asoundrc) else
+ for i,C in pairs(Cards) do
+ for j,c in pairs(C['devs']) do
+ a:write("pcm." .. C['name'] .. j .. " {\n")
+ a:write(" type hw\n")
+ a:write(" card " .. C['name'] .. "\n")
+ a:write(" device " .. C['devs'][j] .. "\n")
+ a:write("}\n")
+ a:write("ctl." .. C['name'] .. j .. " {\n")
+ a:write(" type hw\n")
+ a:write(" card " .. C['name'] .. "\n")
+ a:write(" device " .. C['devs'][j] .. "\n")
+ a:write("}\n\n")
+ end
+ end
+ a:write([[
+#################################################################################################################################
+
+# The complex way - https://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge
+
+# More custom version, but it didn't work for me.
+# hardware 0,0 : used for ALSA playback
+#pcm.loophw00 {
+# type hw
+# card Loopback
+# device 0
+# subdevice 0
+# format S32_LE
+# rate 48000
+#}
+
+# playback PCM device: using loopback subdevice 0,0
+# Don't use a buffer size that is too small. Some apps
+# won't like it and it will sound crappy
+
+#pcm.amix {
+# type dmix
+# ipc_key 219345
+# slave {
+# pcm loophw00
+## period_size 4096
+## periods 2
+# }
+#}
+
+# software volume
+#pcm.asoftvol {
+# type softvol
+# slave.pcm "amix"
+
+# control { name PCM }
+
+# min_dB -51.0
+# max_dB 0.0
+#}
+
+
+# for jack alsa_in: looped-back signal at other ends
+#pcm.cloop {
+# type hw
+# card Loopback
+# device 1
+# subdevice 0
+# format S32_LE
+# rate 48000
+#}
+
+# hardware 0,1 : used for ALSA capture
+#pcm.loophw01 {
+# type hw
+# card Loopback
+# device 0
+# subdevice 1
+# format S32_LE
+# rate 48000
+#}
+
+# for jack alsa_out: looped-back signal at other end
+#pcm.ploop {
+# type hw
+# card Loopback
+# device 1
+# subdevice 1
+# format S32_LE
+# rate 48000
+#}
+
+# duplex device combining our PCM devices defined above
+#pcm.aduplex {
+# type asym
+# playback.pcm "asoftvol"
+# capture.pcm "loophw01"
+#}
+
+# default device
+#pcm.!default {
+# type plug
+# slave.pcm aduplex
+
+# hint {
+# show on
+# description "Duplex Loopback"
+# }
+#}
+
+
+
+# Generic method seems to work better.
+# playback PCM device: using loopback subdevice 0,0
+pcm.amix {
+ type dmix
+ ipc_key 219345
+ slave.pcm "hw:Loopback,0,0"
+}
+
+# capture PCM device: using loopback subdevice 0,1
+pcm.asnoop {
+ type dsnoop
+ ipc_key 219346
+ slave.pcm "hw:Loopback,0,1"
+}
+
+# duplex device combining our PCM devices defined above
+pcm.aduplex {
+ type asym
+ playback.pcm "amix"
+ capture.pcm "asnoop"
+}
+
+# ------------------------------------------------------
+# for jack alsa_in and alsa_out: looped-back signal at other ends
+pcm.ploop {
+ type plug
+ slave.pcm "hw:Loopback,1,1"
+}
+
+pcm.cloop {
+ type dsnoop
+ ipc_key 219348
+ slave.pcm "hw:Loopback,1,0"
+}
+
+# ------------------------------------------------------
+# default device
+
+pcm.!default {
+ type plug
+ slave.pcm "aduplex"
+}
+ ]])
+a:close()
+end
--
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