'''
Video
=====
The :class:`Video` widget is used to display video files and streams.
Depending on your Video core provider, platform, and plugins, you will
be able to play different formats. For example, the pygame video
provider only supports MPEG1 on Linux and OSX. GStreamer is more
versatile, and can read many video containers and codecs such as MKV,
OGV, AVI, MOV, FLV (if the correct gstreamer plugins are installed). Our
:class:`~kivy.core.video.VideoBase` implementation is used under the
hood.
Video loading is asynchronous - many properties are not available until
the video is loaded (when the texture is created)::
def on_position_change(instance, value):
print('The position in the video is', value)
def on_duration_change(instance, value):
print('The duration of the video is', value)
video = Video(source='PandaSneezes.avi')
video.bind(position=on_position_change,
duration=on_duration_change)
'''
__all__ = ('Video', )
from kivy.clock import Clock
from kivy.uix.image import Image
from kivy.core.video import Video as CoreVideo
from kivy.resources import resource_find
from kivy.properties import (BooleanProperty, NumericProperty, ObjectProperty,
OptionProperty)
[ドキュメント]class Video(Image):
'''Video class. See module documentation for more information.
'''
state = OptionProperty('stop', options=('play', 'pause', 'stop'))
'''String, indicates whether to play, pause, or stop the video::
# start playing the video at creation
video = Video(source='movie.mkv', state='play')
# create the video, and start later
video = Video(source='movie.mkv')
# and later
video.state = 'play'
:attr:`state` is an :class:`~kivy.properties.OptionProperty` and defaults
to 'stop'.
'''
play = BooleanProperty(False)
'''
.. deprecated:: 1.4.0
Use :attr:`state` instead.
Boolean, indicates whether the video is playing or not.
You can start/stop the video by setting this property::
# start playing the video at creation
video = Video(source='movie.mkv', play=True)
# create the video, and start later
video = Video(source='movie.mkv')
# and later
video.play = True
:attr:`play` is a :class:`~kivy.properties.BooleanProperty` and defaults to
False.
.. deprecated:: 1.4.0
Use :attr:`state` instead.
'''
eos = BooleanProperty(False)
'''Boolean, indicates whether the video has finished playing or not
(reached the end of the stream).
:attr:`eos` is a :class:`~kivy.properties.BooleanProperty` and defaults to
False.
'''
loaded = BooleanProperty(False)
'''Boolean, indicates whether the video is loaded and ready for playback
or not.
.. versionadded:: 1.6.0
:attr:`loaded` is a :class:`~kivy.properties.BooleanProperty` and defaults
to False.
'''
position = NumericProperty(-1)
'''Position of the video between 0 and :attr:`duration`. The position
defaults to -1 and is set to a real position when the video is loaded.
:attr:`position` is a :class:`~kivy.properties.NumericProperty` and
defaults to -1.
'''
duration = NumericProperty(-1)
'''Duration of the video. The duration defaults to -1, and is set to a real
duration when the video is loaded.
:attr:`duration` is a :class:`~kivy.properties.NumericProperty` and
defaults to -1.
'''
volume = NumericProperty(1.)
'''Volume of the video, in the range 0-1. 1 means full volume, 0
means mute.
:attr:`volume` is a :class:`~kivy.properties.NumericProperty` and defaults
to 1.
'''
options = ObjectProperty({})
'''Options to pass at Video core object creation.
.. versionadded:: 1.0.4
:attr:`options` is an :class:`kivy.properties.ObjectProperty` and defaults
to {}.
'''
_video_load_event = None
def __init__(self, **kwargs):
self._video = None
super(Video, self).__init__(**kwargs)
self.fbind('source', self._trigger_video_load)
if "eos" in kwargs:
self.options["eos"] = kwargs["eos"]
if self.source:
self._trigger_video_load()
[ドキュメント] def seek(self, percent):
'''Change the position to a percentage of duration. Percentage
must be a value between 0-1.
.. warning::
Calling seek() before the video is loaded has no impact.
.. versionadded:: 1.2.0
'''
if self._video is None:
raise Exception('Video not loaded.')
self._video.seek(percent)
def _trigger_video_load(self, *largs):
ev = self._video_load_event
if ev is None:
ev = self._video_load_event = Clock.schedule_once(
self._do_video_load, -1)
ev()
def _do_video_load(self, *largs):
if CoreVideo is None:
return
if self._video:
self._video.stop()
if not self.source:
self._video = None
self.texture = None
else:
filename = self.source
# Check if filename is not url
if '://' not in filename:
filename = resource_find(filename)
self._video = CoreVideo(filename=filename, **self.options)
self._video.volume = self.volume
self._video.bind(on_load=self._on_load,
on_frame=self._on_video_frame,
on_eos=self._on_eos)
if self.state == 'play' or self.play:
self._video.play()
self.duration = 1.
self.position = 0.
def on_play(self, instance, value):
value = 'play' if value else 'stop'
return self.on_state(instance, value)
def on_state(self, instance, value):
if not self._video:
return
if value == 'play':
if self.eos:
self._video.stop()
self._video.position = 0.
self._video.eos = False
self.eos = False
self._video.play()
elif value == 'pause':
self._video.pause()
else:
self._video.stop()
self._video.position = 0
self._video.eos = False
def _on_video_frame(self, *largs):
video = self._video
if not video:
return
self.duration = video.duration
self.position = video.position
self.texture = video.texture
self.canvas.ask_update()
def _on_eos(self, *largs):
if self._video.eos != 'loop':
self.state = 'stop'
self.eos = True
def _on_load(self, *largs):
self.loaded = True
self._on_video_frame(largs)
def on_volume(self, instance, value):
if self._video:
self._video.volume = value
[ドキュメント] def unload(self):
'''Unload the video. The playback will be stopped.
.. versionadded:: 1.8.0
'''
if self._video:
self._video.stop()
self._video.unload()
self._video = None
if __name__ == '__main__':
from kivy.app import App
import sys
if len(sys.argv) != 2:
print("usage: %s file" % sys.argv[0])
sys.exit(1)
class VideoApp(App):
def build(self):
self.v = Video(source=sys.argv[1], state='play')
self.v.bind(state=self.replay)
return self.v
def replay(self, *args):
if self.v.state == 'stop':
self.v.state = 'play'
VideoApp().run()
