From 1d41280b7cf63cb9d84bc3ca1ce7533e8e7cc238 Mon Sep 17 00:00:00 2001
From: Paul Reioux <reioux@gmail.com>
Date: Thu, 9 May 2024 08:15:07 -0700
Subject: [PATCH] pipewire: create 2 virtual audio devices and add user config
 for them

added mono and stereo virtual audio devices, this will allow handhelds
such as the PowKiddy SX20 and others with just 1 mono speaker to downmix
all stereo output for the single mono speaker so for games with channel
specific audios, you miss out any audio while playing.  This is a
software only solution which allows greater flexibility to allow future
manipulations of audio without touching the original HW configurations

also adding the shell scripts to swap between the virtual devices
later during ES operations

pipewire: make virtual audio optional only for RK3326 and RK3566
platforms

Signed-off-by: Paul Reioux <reioux@gmail.com>

pipewire: enable virtual audio drivers for all rocknix devices

Signed-off-by: Paul Reioux <reioux@gmail.com>
---
 packages/audio/pipewire/package.mk            |  6 ++
 .../audio/pipewire/sources/audio-v-devs.conf  | 32 +++++++++
 .../audio/pipewire/sources/audio_vdriver.sh   | 68 +++++++++++++++++++
 3 files changed, 106 insertions(+)
 create mode 100644 packages/audio/pipewire/sources/audio-v-devs.conf
 create mode 100644 packages/audio/pipewire/sources/audio_vdriver.sh

diff --git a/packages/audio/pipewire/package.mk b/packages/audio/pipewire/package.mk
index 270ce84826..bd86cec072 100644
--- a/packages/audio/pipewire/package.mk
+++ b/packages/audio/pipewire/package.mk
@@ -89,6 +89,12 @@ post_install() {
   mkdir -p ${INSTALL}/etc/alsa/conf.d
   ln -sf /usr/share/alsa/alsa.conf.d/50-pipewire.conf ${INSTALL}/etc/alsa/conf.d/50-pipewire.conf
   ln -sf /usr/share/alsa/alsa.conf.d/99-pipewire-default.conf ${INSTALL}/etc/alsa/conf.d/99-pipewire-default.conf
+
+  mkdir -p ${INSTALL}/etc/pipewire/pipewire.conf.d/
+  cp ${PKG_DIR}/sources/audio-v-devs.conf ${INSTALL}/etc/pipewire/pipewire.conf.d/
+  cp ${PKG_DIR}/sources/audio_vdriver.sh ${INSTALL}/usr/bin/
+  chmod 0755 ${INSTALL}/usr/bin/audio_vdriver.sh
+
   enable_service pipewire.socket
   enable_service pipewire.service
   enable_service pipewire-pulse.socket
diff --git a/packages/audio/pipewire/sources/audio-v-devs.conf b/packages/audio/pipewire/sources/audio-v-devs.conf
new file mode 100644
index 0000000000..3b197d8410
--- /dev/null
+++ b/packages/audio/pipewire/sources/audio-v-devs.conf
@@ -0,0 +1,32 @@
+context.modules = [
+    { name = libpipewire-module-loopback
+        args = {
+            node.description = "Stereo Playback Device"
+            capture.props = {
+                node.name      = "stereo_output"
+                media.class    = "Audio/Sink"
+                audio.position = [ FL FR ]
+            }
+            playback.props = {
+                node.name      = "playback.stereo_output"
+                audio.position = [ FL FR ]
+                node.passive   = true
+            }
+        }
+    }
+    { name = libpipewire-module-loopback
+        args = {
+            node.description = "Mono Playback Device"
+            capture.props = {
+                node.name      = "mono_output"
+                media.class    = "Audio/Sink"
+                audio.position = [ MONO ]
+            }
+            playback.props = {
+                node.name      = "playback.mono_output"
+                audio.position = [ MONO ]
+                node.passive   = true
+            }
+        }
+    }
+]
diff --git a/packages/audio/pipewire/sources/audio_vdriver.sh b/packages/audio/pipewire/sources/audio_vdriver.sh
new file mode 100644
index 0000000000..136b2fb518
--- /dev/null
+++ b/packages/audio/pipewire/sources/audio_vdriver.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+#load some built-in useful functions
+. /etc/profile.d/001-functions
+
+AUDIO_V_DEVICE_SETTING_KEY="audio.v-driver"
+
+get_current_driver() {
+  CONFDRIVER=$(get_setting ${AUDIO_V_DEVICE_SETTING_KEY})
+
+  if [ -z ${CONFDRIVER} ]; then
+    CONFDRIVER="stereo"	#default to stereo
+    set_setting ${AUDIO_V_DEVICE_SETTING_KEY} ${CONFDIRVER}
+  fi
+}
+
+load_driver() {
+  DRIVER_TO_LOAD=$1
+  case ${DRIVER_TO_LOAD} in 
+    "stereo")
+      number=$(wpctl status | grep -m 1 "Stereo Playback Device" | grep -Eo '[0-9]+' | awk 'NR==1{print; exit}')
+        ;;
+    "mono")
+      number=$(wpctl status | grep -m 1 "Mono Playback Device" | grep -Eo '[0-9]+' | awk 'NR==1{print; exit}')
+        ;;
+    *)
+      exit 3
+        ;;
+  esac
+
+  # Check if the number is extracted successfully
+  if [ -n "$number" ]; then
+    # Set the default with the extracted number
+    wpctl set-default "$number"
+    echo "Default set to $number"
+  else
+    echo "Error: Unable to extract number from command output."
+  fi
+}
+
+case "$1" in
+  "--options")
+    echo "stereo mono"
+    ;;
+  "--start")
+    get_current_driver
+    load_driver ${CONFDRIVER}
+    ;;
+  "stereo" | "mono")
+    set_setting ${AUDIO_V_DEVICE_SETTING_KEY} $1
+    get_current_driver
+    echo ${CONFDRIVER}
+    load_driver ${CONFDRIVER}
+    ;;
+  "")
+    get_current_driver
+    echo ${CONFDRIVER}
+    ;;
+  *)
+    echo "Unexpected parameter $1" >&2
+    echo "Usage:" >&2
+    echo "  List available drivers:                $0 --options" >&2
+    echo "  Load configured driver and set libs:   $0 --start" >&2
+    echo "  Get current driver:                    $0" >&2
+    echo "  Configure driver to load immediately:  $0 <stereo|mono>" >&2
+    exit 1
+    ;;
+esac