examples/uvc_cam: add UVC camera streaming app

examples/uvc_cam/CMakeLists.txt

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+# ##############################################################################
+# apps/examples/uvc_cam/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_EXAMPLES_UVC_CAM)
+  nuttx_add_application(
+    NAME
+    ${CONFIG_EXAMPLES_UVC_CAM_PROGNAME}
+    PRIORITY
+    ${CONFIG_EXAMPLES_UVC_CAM_PRIORITY}
+    STACKSIZE
+    ${CONFIG_EXAMPLES_UVC_CAM_STACKSIZE}
+    MODULE
+    ${CONFIG_EXAMPLES_UVC_CAM}
+    SRCS
+    uvc_cam_main.c)
+endif()

examples/uvc_cam/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_UVC_CAM
+	tristate "UVC Camera streaming example"
+	default n
+	depends on USBUVC && VIDEO
+	---help---
+		Captures frames from V4L2 camera and streams to USB host
+		via UVC gadget driver (/dev/uvc0).
+
+if EXAMPLES_UVC_CAM
+
+config EXAMPLES_UVC_CAM_PROGNAME
+	string "Program name"
+	default "uvc_cam"
+
+config EXAMPLES_UVC_CAM_PRIORITY
+	int "Task priority"
+	default 100
+
+config EXAMPLES_UVC_CAM_STACKSIZE
+	int "Stack size"
+	default 4096
+
+config EXAMPLES_UVC_CAM_NFRAMES
+	int "Number of frames (0=infinite)"
+	default 0
+
+endif

examples/uvc_cam/Make.defs

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+############################################################################
+# apps/examples/uvc_cam/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_UVC_CAM),)
+CONFIGURED_APPS += $(APPDIR)/examples/uvc_cam
+endif

examples/uvc_cam/Makefile

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+############################################################################
+# apps/examples/uvc_cam/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# UVC Camera streaming application
+
+PROGNAME  = $(CONFIG_EXAMPLES_UVC_CAM_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_UVC_CAM_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_UVC_CAM_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_UVC_CAM)
+
+MAINSRC = uvc_cam_main.c
+
+include $(APPDIR)/Application.mk