meta-pipewire: add recipe to build the bluez-alsa-pipewire gstreamer helper

Unfortunately, the bluez-alsa PCM plugin does not work correctly
when it is used through pipewire (or gstreamer, or anywhere really...).
For this reason I have built a helper client that uses GStreamer
to glue together the bluez-alsa sockets with pipewire.

This helper is implemented as a patch to bluez-alsa so that it can
use its internal private API. In the future this needs some re-thinking

The helper is meant to run in the background as a service and it will
create the appropriate streams in pipewire when it detects a new
device on the bluealsa d-bus interface. Currently it only supports
a2dp-sink and hfp modes (i.e. media player from a phone + calls).
Bluetooth speakers need further policy work in wireplumber that is
too complex to support on the current halibut version of
pipewire/wireplumber.

Bug-AGL: SPEC-2792

Change-Id: I369b40eb1cf6d940ac233fff18605f400bce3628
Signed-off-by: George Kiagiadakis <george.kiagiadakis@collabora.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/meta-pipewire/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend b/meta-pipewire/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend
new file mode 100644
index 00000000..2f9699a8
--- /dev/null
+++ b/meta-pipewire/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend
@@ -0,0 +1,35 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "\
+    file://0001-utils-add-a-gstreamer-helper-application-for-interco.patch \
+    file://bluealsa-gst-helper@.service \
+    "
+
+PACKAGECONFIG += "gsthelper"
+PACKAGECONFIG[gsthelper] = "--enable-gsthelper, --disable-gsthelper, gstreamer1.0"
+
+do_install_append() {
+    if ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then
+        # install the service file
+        mkdir -p ${D}${systemd_system_unitdir}/
+        install -m 0644 ${WORKDIR}/bluealsa-gst-helper@.service ${D}${systemd_system_unitdir}/bluealsa-gst-helper@.service
+
+        # enable the helper to start together with afm-user-session
+        mkdir -p ${D}${systemd_system_unitdir}/afm-user-session@.target.wants
+        ln -sf ../bluealsa-gst-helper@.service ${D}${systemd_system_unitdir}/afm-user-session@.target.wants/bluealsa-gst-helper@.service
+    fi
+}
+
+PACKAGES =+ "${PN}-pipewire"
+
+FILES_${PN}-pipewire = "\
+    ${bindir}/bluealsa-gst-helper \
+    ${systemd_system_unitdir}/bluealsa-gst-helper@.service \
+    ${systemd_system_unitdir}/afm-user-session@.target.wants/bluealsa-gst-helper@.service \
+    "
+RDEPENDS_${PN}-pipewire += "\
+    bluez-alsa \
+    pipewire \
+    gstreamer1.0-plugins-base \
+    gstreamer1.0-pipewire \
+    "