Linux环境下配置虚拟摄像头akvcam
下载源码
git clone https://github.com/webcamoid/akvcam.git
编译&安装
cd akvcam/src
make
sudo make dkms_install
确认是否安装驱动成功，如果有文件，则安装驱动成功
ls /lib/modules/$(uname -r)/extra/akvcam.ko*
可以使用如下命令卸载驱动
sudo make dkms_uninstall
配置虚拟摄像头
修改配置文件
sudo mkdir -p /etc/akvcam
sudo touch /etc/akvcam/config.ini
sudo chmod -vf 644 /etc/akvcam/config.ini
修改/etc/akvcam/config.ini，内容如下：
# Virtual camera configuration file example.
#
# Please, read the instructions to the end.
[Cameras]
# First at all you must define how many virtual cameras will be created.
cameras/size = 2
# Then, define it‘s properties.
#
# A virtual camera can be of 2 types: ‘capture‘ and ‘output‘.
# A ‘capture‘ device will be seen as a normal webcam by any webcam capture
# program.
# A ‘output‘ device will receive frames from a producer program and send it to
# one or many ‘capture‘ devices.
#
# A camera can have also 3 capture/output modes: ‘mmap‘, ‘userptr‘ and ‘rw‘.
# ‘mmap‘ is the most widely supported mode by far, enabling this is more than
# enough in most cases. ‘rw‘ allow you to "echo" or "cat" frames as raw data
# directly to the device using the default frame format. Enabling ‘rw‘ mode will
# disable emulated camera controls in the ‘capture‘ device (brightness,
# contrast, saturation, etc.).
# A device can support all 3 modes at same time.
#
# ‘formats‘ is a comma separated list of index in the format list bellow.
#
# It‘s also possible to set the device number by setting the ‘videonr‘ property,
# if for example videonr=7 the the device will be created as "/dev/video7".
# If ‘videonr‘ is already taken, negative or not set, the driver will assign the
# first free device number.
cameras/1/type = output
cameras/1/mode = mmap, userptr, rw
cameras/1/description = Virtual Camera (output device)
cameras/1/formats = 2
cameras/1/videonr = 7
cameras/2/type = capture
cameras/2/mode = mmap, rw
cameras/2/description = Virtual Camera
cameras/2/formats = 1, 2
[Formats]
# Define how many formats will be supported by the camera.
formats/size = 2
# Now define the frame pixel formats, resolutions and frame rates supported by
# the camera.
#
# Supported capture formats:
#
# RGB32
# RGB24
# RGB16
# RGB15
# BGR32
# BGR24
# UYVY
# YUY2
#
# Supported output formats:
#
# RGB24
# BGR24
#
# YUY2 640x480 is one of the most widely supported formats in webcam capture
# programs. First format defined is the default frame format for
# ‘capture‘/‘output‘.
# ‘width‘, ‘height‘ and ‘fps‘ are unsigned integers.
formats/1/format = YUY2
formats/1/width = 640
formats/1/height = 480
formats/1/fps = 30
# The parameters can also be specified as a comma separated list, so it‘s
# possible to combine the parameters to define several formats in one group.
# ‘fps‘ can also be defined as a fraction.
# The following lines will define 4 formats:
#
# RGB24 640x480 20 FPS
# RGB24 640x480 7.5 FPS
# YUY2 640x480 20 FPS
# YUY2 640x480 7.5 FPS
formats/2/format = RGB24, YUY2
formats/2/width = 640
formats/2/height = 480
formats/2/fps = 20/1, 15/2
# Finally, to create a fully working virtual camera, you must connect one
# ‘output‘ to one or many ‘capture‘ devices.
# Connections are made by index, separated by a colon. The first index is the
# ‘output‘ device, the following index are ‘capture‘ devices.
[Connections]
connections/size = 1
connections/1/connection = 1:2
# You can also define a default frame when a ‘capture‘ device is not receiving
# any input. Only 24 bpp and 32 bpp BMP files are supported.
[General]
# 修改此处的图片路径，只能是BMP格式的图片
default_frame = /etc/akvcam/default_frame.bmp
# This config will take effect on modprobe/insmod.
调试驱动
sudo modprobe akvcam loglevel=7
用法和例子
在前面的驱动和配置文件正常的情况下，使用如下命令加载驱动：
cd akvcam/src
sudo modprobe videodev
# 先卸载，再安装
sudo rmmod akvcam.ko
sudo insmod akvcam.ko
到此处已经虚拟摄像头已经配置好了,打开相机应用查看是否生效,
开机加载(非必需步骤)
要在启动时加载模块，请创建一个/etc/modules-load.d/akvcam.conf文件，然后在其中写入akvcam：
echo akvcam > /etc/modules-load.d/akvcam.conf