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PyQt4_VideoPlayer.py
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import sys, os
from pyface.qt import QtGui, QtCore
os.environ['ETS_TOOLKIT'] = 'qt4'
from scipy import misc
import matplotlib
matplotlib.use('Agg')
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.figure import Figure
import warnings
warnings.filterwarnings('ignore', '.*Using default event loop.*')
#####################
# PyQt4 Video Player:
# 1. make sure all images are in the `frames` folder within the same directory as the python script:
pyDir = os.path.dirname(os.path.abspath(__file__)) #python file location
imgDir = os.path.join(pyDir, 'frames')
# 2. ... and that all images are in correct format (default .png, as seen below)
# 3. ... and in the correct ordering (00, 01, 02, ...)
'''
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Copyright (c) CU, Evan Seitz 2018-2019
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'''
class VidCanvas(QtGui.QDialog):
imgDir = ''
img_paths = []
imgs = []
frames = 0 #total number of frames
run = 0 #switch, {-1,0,1} :: {backwards,pause,forward}
f = 0 #frame index (current frame)
rec = 0 #safeguard for recursion limit
speed = .05 #playback speed, can't be too fast on linux (see below)
def __init__(self, parent=None):
super(VidCanvas, self).__init__(parent)
i = 0
for root, dirs, files in os.walk(imgDir):
for file in sorted(files):
if not file.startswith('.'): #ignore hidden files
if file.endswith(".png"):
VidCanvas.img_paths.append(os.path.join(root, file))
VidCanvas.imgs.append(misc.imread(VidCanvas.img_paths[i]))
i += 1
VidCanvas.frames = int(len(VidCanvas.imgs)) - 1
self.figure = Figure(dpi=200, facecolor='w', edgecolor='w')
self.ax = self.figure.add_axes([0,0,1,1])
self.ax.axis('off')
self.ax.xaxis.set_visible(False)
self.ax.yaxis.set_visible(False)
for item in [self.figure, self.ax]:
item.patch.set_visible(False)
VidCanvas.canvas = FigureCanvas(self.figure)
self.toolbar = NavigationToolbar(VidCanvas.canvas, self)
self.currentIMG = self.ax.imshow(VidCanvas.imgs[0]) #plot initial data
VidCanvas.canvas.draw() #refresh canvas
# player control buttons:
self.buttonF1 = QtGui.QPushButton(ur'\u29D0')
self.buttonF1.clicked.connect(self.F1)
self.buttonF1.setDisabled(False)
self.buttonF1.setDefault(False)
self.buttonF1.setAutoDefault(False)
VidCanvas.buttonForward = QtGui.QPushButton(ur'\u25BB') #u25B6, u25BA
VidCanvas.buttonForward.clicked.connect(self.forward)
VidCanvas.buttonForward.setDisabled(False)
VidCanvas.buttonForward.setDefault(True)
VidCanvas.buttonForward.setAutoDefault(True)
VidCanvas.buttonPause = QtGui.QPushButton(ur'\u25A1') #u25A0, u25FC
VidCanvas.buttonPause.clicked.connect(self.pause)
VidCanvas.buttonPause.setDisabled(True)
VidCanvas.buttonPause.setDefault(False)
VidCanvas.buttonPause.setAutoDefault(False)
VidCanvas.buttonBackward = QtGui.QPushButton(ur'\u25C5') #u25C0, u25C4
VidCanvas.buttonBackward.clicked.connect(self.backward)
VidCanvas.buttonBackward.setDisabled(False)
VidCanvas.buttonBackward.setDefault(False)
VidCanvas.buttonBackward.setAutoDefault(False)
self.buttonB1 = QtGui.QPushButton(ur'\u29CF')
self.buttonB1.clicked.connect(self.B1)
self.buttonB1.setDisabled(False)
self.buttonB1.setDefault(False)
self.buttonB1.setAutoDefault(False)
self.slider = QtGui.QSlider(QtCore.Qt.Horizontal)
self.slider.setMinimum(0)
self.slider.setMaximum(VidCanvas.frames)
self.slider.setValue(0)
self.slider.setTickInterval(1)
self.slider.valueChanged.connect(self.sliderUpdate)
# create layout:
layout = QtGui.QGridLayout()
layout.setSizeConstraint(QtGui.QLayout.SetMinimumSize)
layout.addWidget(self.toolbar, 0,0,1,5)
layout.addWidget(VidCanvas.canvas, 2,0,1,5)
layout.addWidget(self.buttonB1, 3,0,1,1)
layout.addWidget(VidCanvas.buttonBackward, 3,1,1,1)
layout.addWidget(VidCanvas.buttonPause, 3,2,1,1)
layout.addWidget(VidCanvas.buttonForward, 3,3,1,1)
layout.addWidget(self.buttonF1, 3,4,1,1)
layout.addWidget(self.slider,4,0,1,5)
self.setLayout(layout)
def scroll(self, frame):
VidCanvas.canvas.stop_event_loop()
self.slider.setValue(VidCanvas.f)
self.currentIMG.set_data(VidCanvas.imgs[VidCanvas.f]) #update data
VidCanvas.canvas.draw() #refresh canvas
VidCanvas.canvas.start_event_loop(self.speed)
if VidCanvas.run == 1:
if VidCanvas.f < VidCanvas.frames:
VidCanvas.f += 1
self.scroll(VidCanvas.f)
elif VidCanvas.f == VidCanvas.frames:
VidCanvas.f = 0
self.rec +=1 #recursion safeguard
if self.rec == 10:
self.rec = 0
self.pause()
else:
self.scroll(VidCanvas.f)
elif VidCanvas.run == -1:
if VidCanvas.f > 0:
VidCanvas.f -= 1
self.scroll(VidCanvas.f)
elif VidCanvas.f == 0:
VidCanvas.f = VidCanvas.frames
self.rec +=1 #recusion safeguard
if self.rec == 10:
self.rec = 0
self.pause()
else:
self.scroll(VidCanvas.f)
elif VidCanvas.run == 0:
VidCanvas.canvas.stop_event_loop()
def F1(self): #forward one frame
VidCanvas.buttonPause.setDisabled(True)
VidCanvas.buttonForward.setDisabled(False)
VidCanvas.buttonBackward.setDisabled(False)
self.buttonF1.setFocus()
VidCanvas.run = 0
self.rec = 0
VidCanvas.canvas.stop_event_loop()
if VidCanvas.f == VidCanvas.frames:
VidCanvas.f = 0
else:
VidCanvas.f += 1
self.slider.setValue(VidCanvas.f)
self.currentIMG.set_data(VidCanvas.imgs[VidCanvas.f]) #update data
VidCanvas.canvas.draw() #refresh canvas
def forward(self): #play forward
VidCanvas.buttonForward.setDisabled(True)
VidCanvas.buttonBackward.setDisabled(False)
VidCanvas.buttonPause.setDisabled(False)
VidCanvas.buttonPause.setFocus()
VidCanvas.run = 1
self.rec = 0
self.scroll(VidCanvas.f)
def pause(self): #stop play
VidCanvas.buttonForward.setDisabled(False)
VidCanvas.buttonBackward.setDisabled(False)
VidCanvas.buttonPause.setDisabled(True)
VidCanvas.buttonForward.setFocus()
VidCanvas.run = 0
self.rec = 0
self.scroll(VidCanvas.f)
def backward(self): #play backward
VidCanvas.buttonBackward.setDisabled(True)
VidCanvas.buttonForward.setDisabled(False)
VidCanvas.buttonPause.setDisabled(False)
VidCanvas.buttonPause.setFocus()
VidCanvas.run = -1
self.rec = 0
self.scroll(VidCanvas.f)
def B1(self): #backward one frame
VidCanvas.buttonPause.setDisabled(True)
VidCanvas.buttonForward.setDisabled(False)
VidCanvas.buttonBackward.setDisabled(False)
self.buttonB1.setFocus()
VidCanvas.run = 0
self.rec = 0
VidCanvas.canvas.stop_event_loop()
if VidCanvas.f == 0:
VidCanvas.f = VidCanvas.frames
else:
VidCanvas.f -= 1
self.slider.setValue(VidCanvas.f)
self.currentIMG.set_data(VidCanvas.imgs[VidCanvas.f]) #update data
VidCanvas.canvas.draw() #refresh canvas
def sliderUpdate(self): #update frame based on user slider position
if VidCanvas.f != self.slider.value(): #only if user moves slider position manually
VidCanvas.buttonPause.setDisabled(True)
VidCanvas.buttonForward.setDisabled(False)
VidCanvas.buttonBackward.setDisabled(False)
VidCanvas.run = 0
self.rec = 0
VidCanvas.canvas.stop_event_loop()
VidCanvas.f = self.slider.value()
self.currentIMG.set_data(VidCanvas.imgs[self.slider.value()]) #update data
VidCanvas.canvas.draw() #refresh canvas
################################################################################
# overhead setup:
class MainWindow(QtGui.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.stack = QtGui.QStackedWidget(self)
vid = VidCanvas(self)
self.stack.addWidget(vid)
self.setCentralWidget(self.stack)
self.show()
if __name__ == '__main__':
app = QtGui.QApplication.instance()
if app is None:
app = QtGui.QApplication([])
w = MainWindow()
sys.exit(app.exec_())