x-linux-ai: recipes-samples: add face-recognition example

Make the minimal changes needed to adapt the original X-LINUX-AI example and
integrate it into the Digi custom launcher.

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-dey/dynamic-layers/x-linux-ai/recipes-samples/common/scripts/launch_npu_demo.sh

@@ -57,5 +57,13 @@ DEMO_DIR="/usr/local/x-linux-ai/${DEMO_FOLDER_NAME}"
 # Verify that the demo directory exists.
 [ -d "${DEMO_DIR}" ] || { echo "Error: Demo ${DEMO} does not exist"; exit 1; }
 
+# Verify demo type
+DEMO_TYPE="python"
+case "$DEMO" in
+  face_recognition)
+    DEMO_TYPE="bin"
+    ;;
+esac
+
 # Execute the demo.
-"${DEMO_DIR}/launch_python_${DEMO}.sh"
+"${DEMO_DIR}/launch_${DEMO_TYPE}_${DEMO}.sh"

meta-digi-dey/dynamic-layers/x-linux-ai/recipes-samples/face-recognition/files/patches/0001-face-recognition-remove-weston-user-check-from-launc.patch

@@ -0,0 +1,58 @@
+From: Arturo Buzarra <arturo.buzarra@digi.com>
+Date: Tue, 12 May 2026 13:58:31 +0200
+Subject: [PATCH] face-recognition: remove weston user check from launch
+
+Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
+---
+ stai-mpu/launch_bin_face_recognition.sh          | 8 +-------
+ stai-mpu/launch_bin_face_recognition_testdata.sh | 8 +-------
+ 2 files changed, 2 insertions(+), 14 deletions(-)
+
+diff --git a/stai-mpu/launch_bin_face_recognition.sh b/stai-mpu/launch_bin_face_recognition.sh
+index d7c9238..44e954c 100755
+--- a/stai-mpu/launch_bin_face_recognition.sh
++++ b/stai-mpu/launch_bin_face_recognition.sh
+@@ -5,17 +5,11 @@
+ #
+ # This software is licensed under terms that can be found in the LICENSE file
+ # in the root directory of this software component.
+ # If no LICENSE file comes with this software, it is provided AS-IS.
+ 
+-weston_user=$(ps aux | grep '/usr/bin/weston '|grep -v 'grep'|awk '{print $1}')
+ FRAMEWORK=$1
+ echo "stai wrapper used : "$FRAMEWORK
+ source /usr/local/x-linux-ai/resources/config_board_npu.sh
+ cmd="/usr/local/x-linux-ai/face-recognition/stai_mpu_face_recognition -m /usr/local/x-linux-ai/face-recognition/models/$FACE_DETECTION_MODEL -f /usr/local/x-linux-ai/face-recognition/models/$FACE_RECO_MODEL -d /usr/local/x-linux-ai/face-recognition/$FACE_DATABASE --framerate $DFPS --frame_width $DWIDTH --frame_height $DHEIGHT --camera_src $CAMERA_SRC"
+ 
+-if [ "$weston_user" != "root" ]; then
+-	echo "user : "$weston_user
+-	script -qc "su -l $weston_user -c '$cmd'"
+-else
+-	$cmd
+-fi
++$cmd
+diff --git a/stai-mpu/launch_bin_face_recognition_testdata.sh b/stai-mpu/launch_bin_face_recognition_testdata.sh
+index 026e9c2..7fcce7d 100755
+--- a/stai-mpu/launch_bin_face_recognition_testdata.sh
++++ b/stai-mpu/launch_bin_face_recognition_testdata.sh
+@@ -5,17 +5,11 @@
+ #
+ # This software is licensed under terms that can be found in the LICENSE file
+ # in the root directory of this software component.
+ # If no LICENSE file comes with this software, it is provided AS-IS.
+ 
+-weston_user=$(ps aux | grep '/usr/bin/weston '|grep -v 'grep'|awk '{print $1}')
+ FRAMEWORK=$1
+ echo "stai wrapper used : "$FRAMEWORK
+ source /usr/local/x-linux-ai/resources/config_board_npu.sh
+ cmd="/usr/local/x-linux-ai/face-recognition/stai_mpu_face_recognition -m /usr/local/x-linux-ai/face-recognition/models/$FACE_DETECTION_MODEL -i /usr/local/x-linux-ai/face-recognition/models/$FACE_RECO_DATA -f /usr/local/x-linux-ai/face-recognition/models/$FACE_RECO_MODEL -d /usr/local/x-linux-ai/face-recognition/$FACE_DATABASE"
+ 
+-if [ "$weston_user" != "root" ]; then
+-	echo "user : "$weston_user
+-	script -qc "su -l $weston_user -c '$cmd'"
+-else
+-	$cmd
+-fi
++$cmd
+-- 
+2.34.1

meta-digi-dey/dynamic-layers/x-linux-ai/recipes-samples/face-recognition/stai-mpu-face-recognition-cpp_6.%.bbappend

@@ -0,0 +1,25 @@
+# Copyright (C) 2026, Digi International Inc.
+
+FILESEXTRAPATHS:prepend := "${THISDIR}/../common:${THISDIR}/files:"
+
+SRC_URI += " \
+    file://scripts/launch_npu_demo.sh \
+    file://patches/0001-face-recognition-remove-weston-user-check-from-launc.patch \
+"
+
+do_install:append () {
+    # Install the generic launch script.
+    install -d ${D}${sysconfdir}/demos/scripts
+    install -m 755 ${WORKDIR}/scripts/launch_npu_demo.sh ${D}${sysconfdir}/demos/scripts/
+    # Create launch symlink for the demo.
+    ln -sf launch_npu_demo.sh ${D}${sysconfdir}/demos/scripts/launch_npu_demo_face_recognition.sh
+}
+
+RDEPENDS:${PN} += " \
+    libdrm-tests \
+    dcmipp-isp-ctrl \
+"
+
+FILES:${PN} += " \
+    ${systemd_unitdir}/demos/scripts/* \
+"