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video.py
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video.py
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"""Video support"""
__all__ = ['IVideoProducer', 'VideoDevice', 'VideoError']
from .application.notification import NotificationCenter, NotificationData
from zope.interface import Attribute, Interface, implements
from sipsimple.core import SIPCoreError, VideoCamera
class IVideoProducer(Interface):
"""
Interface describing an object which can produce video data.
All attributes of this interface are read-only.
"""
producer = Attribute("The core producer object which can be connected to a consumer")
class VideoError(Exception):
pass
class VideoDevice(object):
implements(IVideoProducer)
def __init__(self, device_name, resolution, framerate):
self._camera = self._open_camera(device_name, resolution, framerate)
self._camera.start()
def _open_camera(self, device_name, resolution, framerate):
try:
return VideoCamera(device_name, resolution, framerate)
except SIPCoreError:
try:
return VideoCamera('system_default', resolution, framerate)
except SIPCoreError:
return VideoCamera(None, resolution, framerate)
def set_camera(self, device_name, resolution, framerate):
old_camera = self._camera
old_camera.close()
new_camera = self._open_camera(device_name, resolution, framerate)
if not self.muted:
new_camera.start()
self._camera = new_camera
notification_center = NotificationCenter()
notification_center.post_notification('VideoDeviceDidChangeCamera', sender=self, data=NotificationData(old_camera=old_camera, new_camera=new_camera))
@property
def producer(self):
return self._camera
@property
def name(self):
return self._camera.name
@property
def real_name(self):
return self._camera.real_name
@property
def muted(self):
return self.__dict__.get('muted', False)
@muted.setter
def muted(self, value):
if not isinstance(value, bool):
raise ValueError('illegal value for muted property: %r' % (value,))
if value == self.muted:
return
if value:
self._camera.stop()
else:
self._camera.start()
self.__dict__['muted'] = value

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