python实现onvif客户端及问题小结

本文已参与「新人创作礼」活动，一起开启掘金创作之路。

1. 前言

原本一直使用的go方式进行摄像头的搜索、改网络地址、获取media、ptz以及preset等，但是目前测试go的库在部分摄像头上无法正常ptz，于是在分析c/c++的库和python的库后，暂时打算测试一下python的库，使用python在pip中可以直接安装的onvif包即可，写起来还是很方便的，大部分接口都实现了，相较于go的包更成熟一些，相较于c++的方式能更快上手，所以目前搜索和改网络等还是使用的go，ptz等go实现不好的地方传递参数给python脚本来做，等到有功夫的时候再来把go的包修改一下（python的包显示似乎搜索不好处理，所以也没有全部切换到python）。

2. python-onvif安装及ptz示例

地址，目前在0.2.0版本，似乎也有一段时间没有更新了：

github.com/quatanium/p…

可以直接使用pip安装，这个是适用于python2的，其中也提供了适用于python3的地址：github.com/FalkTannhae…

2.1 openwrt下安装pip及python-onvif

安装python2.7：

opkg update

opkg install python2.7

安装pip：

wget https://bootstrap.pypa.io/pip/2.7/get-pip.py  --no-check-certificate

python2.7 get-pip.py

安装python-onvif：

pip install onvif

2.2 ptz示例

如下，也是采用的continuousMove，这个是官方给的示例，可以直接拿来用：

from time import sleep

from onvif import ONVIFCamera

XMAX = 1
XMIN = -1
YMAX = 1
YMIN = -1

def perform_move(ptz, request, timeout):
    # Start continuous move
    ptz.ContinuousMove(request)
    # Wait a certain time
    sleep(timeout)
    # Stop continuous move
    ptz.Stop({'ProfileToken': request.ProfileToken})

def move_up(ptz, request, timeout=1):
    print 'move up...'
    request.Velocity.PanTilt._x = 0
    request.Velocity.PanTilt._y = YMAX
    perform_move(ptz, request, timeout)

def move_down(ptz, request, timeout=1):
    print 'move down...'
    request.Velocity.PanTilt._x = 0
    request.Velocity.PanTilt._y = YMIN
    perform_move(ptz, request, timeout)

def move_right(ptz, request, timeout=1):
    print 'move right...'
    request.Velocity.PanTilt._x = XMAX
    request.Velocity.PanTilt._y = 0
    perform_move(ptz, request, timeout)

def move_left(ptz, request, timeout=1):
    print 'move left...'
    request.Velocity.PanTilt._x = XMIN
    request.Velocity.PanTilt._y = 0
    perform_move(ptz, request, timeout)

def continuous_move():
    mycam = ONVIFCamera('192.168.0.112', 80, 'admin', '12345')
    # Create media service object
    media = mycam.create_media_service()
    # Create ptz service object
    ptz = mycam.create_ptz_service()

    # Get target profile
    media_profile = media.GetProfiles()[0];

    # Get PTZ configuration options for getting continuous move range
    request = ptz.create_type('GetConfigurationOptions')
    request.ConfigurationToken = media_profile.PTZConfiguration._token
    ptz_configuration_options = ptz.GetConfigurationOptions(request)

    request = ptz.create_type('ContinuousMove')
    request.ProfileToken = media_profile._token

    ptz.Stop({'ProfileToken': media_profile._token})

    # Get range of pan and tilt
    # NOTE: X and Y are velocity vector
    global XMAX, XMIN, YMAX, YMIN
    XMAX = ptz_configuration_options.Spaces.ContinuousPanTiltVelocitySpace[0].XRange.Max
    XMIN = ptz_configuration_options.Spaces.ContinuousPanTiltVelocitySpace[0].XRange.Min
    YMAX = ptz_configuration_options.Spaces.ContinuousPanTiltVelocitySpace[0].YRange.Max
    YMIN = ptz_configuration_options.Spaces.ContinuousPanTiltVelocitySpace[0].YRange.Min

    # move right
    move_right(ptz, request)

    # move left
    move_left(ptz, request)

    # Move up
    move_up(ptz, request)

    # move down
    move_down(ptz, request)

if __name__ == '__main__':
    continuous_move()