x-linux-ai: recipes-samples: fix USB camera support

This commit fixes several issues related to the initialization of AI demos when
using a USB camera.

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

meta-digi-dey/dynamic-layers/x-linux-ai/recipes-samples/resources/application-resources.bbappend

@@ -1,7 +1,9 @@
-# Copyright (C) 2024, Digi International Inc.
+# Copyright (C) 2024,2025, Digi International Inc.
 
 FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
 
 SRC_URI += " \
     file://patches/0001-config_board-add-support-to-STM32MP255-processor.patch \
+    file://patches/0002-config_board-fix-support-for-web-camera-with-STM32MP.patch \
+    file://patches/0003-setup_camera_main_isp-fix-support-for-web-camera.patch \
 "

meta-digi-dey/dynamic-layers/x-linux-ai/recipes-samples/resources/files/patches/0002-config_board-fix-support-for-web-camera-with-STM32MP.patch

@@ -0,0 +1,68 @@
+From: Arturo Buzarra <arturo.buzarra@digi.com>
+Date: Tue, 21 Jan 2025 12:04:52 +0100
+Subject: [PATCH] config_board: fix support for web camera with STM32MP255
+ processor
+
+This commit disables the dual camera pipeline support for USB cameras, as it is
+exclusive to cameras using the DCMIPP peripheral.
+
+Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
+---
+ .../files/resources-files/config_board.sh     | 27 +++++++++++++++++++
+ 1 file changed, 27 insertions(+)
+
+diff --git a/resources-files/config_board.sh b/resources-files/config_board.sh
+index a623086..e7e8b00 100644
+--- a/resources-files/config_board.sh
++++ b/resources-files/config_board.sh
+@@ -15,10 +15,28 @@ STM32MP157="stm32mp157"
+ STM32MP157FEV1="stm32mp157f-ev1st"
+ STM32MP255="stm32mp255"
+ STM32MP257="stm32mp257"
+ STM32MP257FEV1="stm32mp257f-ev1st"
+
++function is_dcmipp_present() {
++  DCMIPP_SENSOR="NOTFOUND"
++  # ov5640 or imx335 camera can be present on csi connector
++  for video in $(find /sys/class/video4linux -name "video*" -type l);
++  do
++    if [ "$(cat $video/name)" = "dcmipp_main_capture" ]; then
++      for sub in $(find /sys/class/video4linux -name "v4l-subdev*" -type l);
++      do
++        subdev_name=$(tr -d '\0' < $sub/name | awk '{print $1}')
++        if [ "$subdev_name" = "ov5640" ] || [ "$subdev_name" = "imx335" ]; then
++            DCMIPP_SENSOR=$subdev_name
++            break;
++        fi
++      done
++    fi
++  done
++}
++
+ if [[ "$FRAMEWORK" == "nbg" ]]; then
+   NN_EXT=".nb"
+ elif [[ "$FRAMEWORK" == "tflite" ]]; then
+   NN_EXT=".tflite"
+ elif [[ "$FRAMEWORK" == "onnx" ]]; then
+@@ -107,10 +125,19 @@ if [[ "$COMPATIBLE" == *"$STM32MP255"* ]]; then
+     OBJ_DETEC_MODEL="coco_ssd_mobilenet/ssd_mobilenet_v2_fpnlite_10_256_int8$NN_EXT"
+     OBJ_DETEC_MODEL_LABEL="coco_ssd_mobilenet/labels_coco_dataset_80"
+   fi
+   OBJ_DETECT_DATA="coco_ssd_mobilenet/testdata/"
+   OPTIONS="--dual_camera_pipeline"
++
++  is_dcmipp_present
++  if [ "$DCMIPP_SENSOR" != "NOTFOUND" ]; then
++    # DCMIPP camera
++    OPTIONS="--dual_camera_pipeline"
++  else
++    # Web camera
++    OPTIONS=""
++  fi
+ fi
+
+ if [[ "$COMPATIBLE" == *"$STM32MP257"* ]]; then
+   SEMANTIC_SEGMENTATION_MODEL="deeplabv3/deeplabv3_257_int8_per_tensor$NN_EXT"
+   SEMANTIC_SEGMENTATION_LABEL="deeplabv3/labels_pascalvoc"
+--
+2.34.1

meta-digi-dey/dynamic-layers/x-linux-ai/recipes-samples/resources/files/patches/0003-setup_camera_main_isp-fix-support-for-web-camera.patch

@@ -0,0 +1,39 @@
+From: Arturo Buzarra <arturo.buzarra@digi.com>
+Date: Tue, 21 Jan 2025 12:08:51 +0100
+Subject: [PATCH] setup_camera_main_isp: fix support for web camera
+
+This commit fixes the logic for detecting internal DCMIPP camera devices and
+disables any image post-processing when using USB cameras.
+
+Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
+---
+ .../resources/files/resources-files/setup_camera_main_isp.sh   | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/resources-files/setup_camera_main_isp.sh b/resources-files/setup_camera_main_isp.sh
+index b52ffa2..444bf37 100644
+--- a/resources-files/setup_camera_main_isp.sh
++++ b/resources-files/setup_camera_main_isp.sh
+@@ -56,11 +56,11 @@ function is_dcmipp_present() {
+
+ function get_webcam_device() {
+     found="NOTFOUND"
+     for video in $(find /sys/class/video4linux -name "video*" -type l | sort);
+     do
+-        if [ "$(cat $video/name)" = "dcmipp_main_capture" ] || [ "$(cat $video/name)" = "st,stm32mp25-vdec-dec" ] || [ "$(cat $video/name)" = "st,stm32mp25-venc-enc" ] || [ "$(cat $video/name)" = "dcmipp_dump_capture" ] || [ "$(cat $video/name)" = "dcmipp_aux_capture" ] || [ "$(cat $video/name)" = "dcmipp_main_isp_stat_capture" ] ; then
++        if [ "$(cat $video/name)" = "dcmipp_main_capture" ] || [ "$(cat $video/name)" = "st,stm32mp25-vdec-dec" ] || [ "$(cat $video/name)" = "st,stm32mp25-venc-enc" ] || [ "$(cat $video/name)" = "dcmipp_dump_capture" ] || [ "$(cat $video/name)" = "dcmipp_aux_capture" ] || [ "$(cat $video/name)" = "dcmipp_main_isp_stat_capture" ] || [ "$(cat $video/name)" = "dcmipp_main_isp_params_output" ] ; then
+             found="FOUND"
+         else
+             V4L_DEVICE="$(basename $video)"
+             break;
+         fi
+@@ -220,6 +220,7 @@ else
+ 	V4L2_CAPS="video/x-raw, width=$WIDTH, height=$HEIGHT"
+ 	V4L_OPT="io-mode=4"
+ 	v4l2-ctl --set-parm=20
+ 	echo "V4L_DEVICE_PREV="$V4L_DEVICE
+ 	echo "V4L2_CAPS_PREV="$V4L2_CAPS
++	echo "MAIN_POSTPROC= "
+ fi
+--
+2.34.1