pyqt: 使用PyQT制作视频播放器

转载自Python应用03 使用PyQT制作视频播放器：

import time
import sys

from PyQt4 import QtGui, QtCore
from PyQt4.phonon import Phonon


class PollTimeThread(QtCore.QThread):
    """
    This thread works as a timer.
    """
    update = QtCore.pyqtSignal()

    def __init__(self, parent):
        super(PollTimeThread, self).__init__(parent)

    def run(self):
        while True:
            time.sleep(1)
            if self.isRunning():
                # emit signal
                self.update.emit()
            else:
                return

class Window(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)

        # media
        self.media = Phonon.MediaObject(self)
        self.media.stateChanged.connect(self.handleStateChanged)
        self.video = Phonon.VideoWidget(self)
        self.video.setMinimumSize(200, 200)
        self.audio = Phonon.AudioOutput(Phonon.VideoCategory, self)
        Phonon.createPath(self.media, self.audio)
        Phonon.createPath(self.media, self.video)

        # control button
        self.button = QtGui.QPushButton('选择文件', self)
        self.button.clicked.connect(self.handleButton)

        # for display of time lapse
        self.info = QtGui.QLabel(self)

        # layout
        layout = QtGui.QGridLayout(self)
        layout.addWidget(self.video, 1, 1, 3, 3)
        layout.addWidget(self.info, 4, 1, 1, 3)
        layout.addWidget(self.button, 5, 1, 1, 3)

        # signal-slot, for time lapse
        self.thread = PollTimeThread(self)
        self.thread.update.connect(self.update)

    def update(self):
        # slot
        lapse = self.media.currentTime()/1000.0
        self.info.setText("%4.2f 秒" % lapse)

    def startPlay(self):
        if self.path:
            self.media.setCurrentSource(Phonon.MediaSource(self.path))

            # use a thread as a timer
            self.thread = PollTimeThread(self)
            self.thread.update.connect(self.update)
            self.thread.start()
            self.media.play()

    def handleButton(self):
        if self.media.state() == Phonon.PlayingState:
            self.media.stop()
            self.thread.terminate()
        else:
            self.path = QtGui.QFileDialog.getOpenFileName(self, self.button.text())
            self.startPlay()

    def handleStateChanged(self, newstate, oldstate):
        if newstate == Phonon.PlayingState:
            self.button.setText('停止')
        elif (newstate != Phonon.LoadingState and
              newstate != Phonon.BufferingState):
            self.button.setText('选择文件')
            if newstate == Phonon.ErrorState:
                source = self.media.currentSource().fileName()
                print ('错误：不能播放：', source.toLocal8Bit().data())
                print ('  %s' % self.media.errorString().toLocal8Bit().data())


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    app.setApplicationName('视频播放')
    window = Window()
    window.show()
    sys.exit(app.exec_())

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[1] Python应用03 使用PyQT制作视频播放器