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examples/uvc_cam: add UVC camera streaming app
Usage: uvc_cam [nframes] [video_dev] [uvc_dev] V4L2 capture -> write UVC gadget device. Uses boardctl to initialize/deinitialize UVC gadget. Queries sensor pixel format, resolution and frame rate via V4L2. Uses poll() to wait for USB host streaming state. Supports optional device path arguments (default /dev/video0, /dev/uvc0). Supports configurable frame count (0=infinite). Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
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‎examples/uvc_cam/CMakeLists.txt‎

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

‎examples/uvc_cam/Kconfig‎

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

‎examples/uvc_cam/Make.defs‎

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

‎examples/uvc_cam/Makefile‎

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

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