driveset_reader.py 文件源码

def startCapture(self):
      global currentSecond
      global delayVideoData
      #cap = self.capturer
      num = 0
      while(self.capturing):
         while (self.paused and self.capturing):
            time.sleep(0.05)

         prevTime = datetime.now()

         if (self.frameNumberChanged):
            newFrameNumber = int(self.sliderVideoFrame.value()*30)
            num = newFrameNumber
            self.frameNumber = newFrameNumber
            self.frameNumberChanged = False

         frame = self.videoReader.get_data(num)
         num = num+1

         if (num >= self.videoReader.get_length()):
            self.frameNumberChanged=True
            self.sliderVideoFrame.setValue(0)
            self.start_button.setText('Start')
            self.video_thread = False
            self.capturing = False      
            break

         self.frameNumber = num
         currentSecond = self.frameNumber/fps   #valor importante para sync datos
         self.labelCurrentVideoSecond.setText("{0:.1f}".format(currentSecond - delayVideoToData))
         if (self.sliderWasReleased):
            self.sliderVideoFrame.setValue(int(self.frameNumber/fps))

         #Convert opencv mat to QImage:
         imageQ = QtGui.QImage(frame.tostring(), frame.shape[1], frame.shape[0], QtGui.QImage.Format_RGB888)

         if (frame.shape[1] != videowidthShow or frame.shape[0] != videoheightShow):
            imageQ = imageQ.scaled(videowidthShow, videoheightShow)  #resize image to fit

         #Convert QImage to pixmap:
         pixmap = QtGui.QPixmap.fromImage(imageQ)
         #Set pixmap to label:
         #self.labelImage.setPixmap(pixmap) #old mode, cuidado porque es un thread outside the GUI, esto da problemas en pyqt
         self.signalUpdatePixmap.emit(pixmap)   #nuevo mode para evitar esos problemas
         self.updateScoreLabels()
         diftime = ((datetime.now()-prevTime).microseconds)/1000000.0
         #print (diftime)
         #print(1/fps - diftime )
         if (diftime < 1/fps):
            time.sleep (1/fps - diftime)
         else:
            time.sleep(0.01)
         app.processEvents()    #prevents app from crashing because of lack of responsiveness