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# (C) Copyright 2004-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
"""
Demonstrates a 'display only' video editor for Qt5+.
Please refer to the `VideoEditor API docs`_ for further information.
.. _VideoEditor API docs: https://docs.enthought.com/traitsui/api/traitsui.editors.video_editor.html#traitsui.editors.video_editor.VideoEditor
"""
import numpy as np
from PIL import Image
from pyface.qt import is_qt5
from pyface.qt.QtGui import QImage
from traits.api import (
Bool,
Button,
Callable,
Float,
HasTraits,
Range,
Str,
observe,
)
from traitsui.api import ButtonEditor, ContextValue, HGroup, Item, UItem, View
from traitsui.editors.video_editor import MediaStatus, PlayerState, VideoEditor
def QImage_from_np(image):
assert np.max(image) <= 255
image8 = image.astype(np.uint8, order='C', casting='unsafe')
height, width, colors = image8.shape
bytesPerLine = 4 * width
image = QImage(
image8.data, width, height, bytesPerLine, QImage.Format.Format_RGB32
)
return image
def np_from_QImage(qimage):
# Creates a numpy array from a pyqt(5) QImage object
width, height = qimage.width(), qimage.height()
channels = qimage.pixelFormat().channelCount()
return (
np.array(qimage.bits().asarray(width * height * channels))
.reshape(height, width, channels)
.astype('u1')
)
def qimage_function(antialiasing=True):
def antialias_func(image_func):
"""
Turns an image function into a QImage function,
bound within the viewing frames box.
"""
def qimage_conv_func(image, box_dims):
_np_image = image_func(np_from_QImage(image))
pil_image = Image.fromarray(_np_image)
if antialiasing:
pil_image.thumbnail(box_dims, Image.ANTIALIAS)
else:
pil_image.thumbnail(box_dims)
_np_image = np.array(pil_image)
image = QImage_from_np(_np_image)
return image, _np_image
return qimage_conv_func
return antialias_func
@qimage_function(antialiasing=False)
def test_image_func(image):
return image.transpose(1, 0, 2)
class VideoEditorDemo(HasTraits):
"""Defines the main VideoEditor demo class."""
#: The URL that holds the video data.
video_url = Str()
#: A button that plays/pauses
play_pause_button = Button()
button_label = Str('Play')
state = PlayerState
duration = Float
position = Range(low=0.0, high='duration')
error = Str
status = MediaStatus
buffer = Range(0, 100)
muted = Bool(True)
volume = Range(0.0, 100.0, value=100.0)
playback_rate = Float(1.0)
image_func = Callable()
@observe('state')
def _state_update(self, event):
if event.new == 'stopped' or event.new == 'paused':
self.button_label = 'Play'
elif event.new == 'playing':
self.button_label = 'Pause'
@observe('play_pause_button')
def _play_pause_button_click(self, event):
if self.state == 'stopped' or self.state == 'paused':
self.state = 'playing'
else:
self.state = 'paused'
# Demo view
traits_view = View(
UItem('video_url'),
UItem(
'video_url',
editor=VideoEditor(
state=ContextValue('state'),
position=ContextValue('position'),
duration=ContextValue('duration'),
video_error=ContextValue('error'),
media_status=ContextValue('status'),
buffer=ContextValue('buffer'),
muted=ContextValue('muted'),
volume=ContextValue('volume'),
playback_rate=ContextValue('playback_rate'),
image_func=ContextValue('image_func'),
notify_interval=0.5,
),
),
HGroup(
UItem(
'play_pause_button',
editor=ButtonEditor(label_value='button_label'),
enabled_when='not bool(error)',
width=100,
),
UItem('position'),
),
HGroup(
Item('playback_rate'),
Item('muted', label='Mute'),
Item('volume'),
),
HGroup(
Item('state', style='readonly'),
Item('status', style='readonly'),
Item('buffer', style='readonly'),
Item('error', visible_when="bool(error)", style='readonly'),
),
title='VideoEditor',
buttons=['OK'],
width=800,
height=600,
resizable=True,
)
url = "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerEscapes.mp4" # noqa: E501
# Create the demo:
if is_qt5:
demo = VideoEditorDemo(image_func=test_image_func, video_url=url)
else:
# Qt 6 can't do on-the-fly image manipulation
demo = VideoEditorDemo(video_url=url)
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
demo.configure_traits()
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