plchat/audiowidget.py

#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
## All rights reserved.
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## This file is part of the examples of PyQt.
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##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
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##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
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## $QT_END_LICENSE$
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from PyQt5 import QtWidgets, QtCore
from PyQt5.QtCore import QDir, Qt, QUrl, QSize
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer, QMediaPlaylist
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtWidgets import (QApplication, QFileDialog, QHBoxLayout, QLabel,
        QPushButton, QSizePolicy, QSlider, QStyle, QVBoxLayout, QWidget, QDesktopWidget)
from PyQt5.QtGui import QDesktopServices


class AudioPlayer(QWidget):

    def __init__(self, parent=None):
        super(AudioPlayer, self).__init__(parent)

        self.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.Preferred)

        self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.LowLatency)

        self.playlist = QMediaPlaylist()
        self.playlist.setPlaybackMode(QMediaPlaylist.Loop)

        self.mediaPlayer.setPlaylist(self.playlist)

        self.playButton = QPushButton()
        self.playButton.setEnabled(False)
        self.playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))
        self.playButton.clicked.connect(self.play)

        self.positionSlider = ClickSlider()
        self.positionSlider.setOrientation(Qt.Horizontal)
        self.positionSlider.setRange(0, 0)
        self.positionSlider.sliderMoved.connect(self.setPosition)

        self.volumeButton = QPushButton()
        self.volumeButton.setEnabled(False)
        self.volumeButton.setIcon(self.style().standardIcon(QStyle.SP_MediaVolume))
        self.volumeButton.clicked.connect(self.doMute)

        self.errorLabel = QLabel()
        self.errorLabel.setSizePolicy(QSizePolicy.Preferred,
                QSizePolicy.Maximum)

        controlLayout = QHBoxLayout()
        controlLayout.setContentsMargins(0, 0, 0, 0)
        controlLayout.addWidget(self.playButton, 1)
        controlLayout.addWidget(self.positionSlider, 10)
        controlLayout.addWidget(self.volumeButton, 1)

        layout = QVBoxLayout()
        layout.addLayout(controlLayout)
        layout.addWidget(self.errorLabel)

        self.setLayout(layout)

        self.mediaPlayer.stateChanged.connect(self.mediaStateChanged)
        self.mediaPlayer.positionChanged.connect(self.positionChanged)
        self.mediaPlayer.durationChanged.connect(self.durationChanged)
        self.mediaPlayer.error.connect(self.handleError)

    def openFile(self, fileName):
        if fileName != '':
            fileName = fileName
            
            self.playlist.addMedia(QMediaContent(QUrl(fileName)))
            self.playlist.next()
            
            
            self.mediaPlayer.play()
            self.mediaPlayer.pause()
            #self.mediaPlayer.setMedia(
            #        QMediaContent(QUrl(fileName)))
                    #QMediaContent(QUrl.fromLocalFile(fileName)))
            self.playButton.setEnabled(True)
            self.volumeButton.setEnabled(True)
            #self.mediaPlayer.playlist().setPlaybackMode(QMediaPlaylist.Loop)

    def play(self):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.mediaPlayer.pause()
        else:
            self.mediaPlayer.play()

    def mediaStateChanged(self, state):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPause))
        else:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPlay))

    def positionChanged(self, position):
        self.positionSlider.setValue(position)

    def durationChanged(self, duration):
        self.positionSlider.setRange(0, duration)

    def setPosition(self, position):
        self.mediaPlayer.setPosition(position)
    
    def doMute(self, checked):
        self.mediaPlayer.setMuted(not self.mediaPlayer.isMuted())
        if self.mediaPlayer.isMuted():
            self.volumeButton.setIcon(self.style().standardIcon(QStyle.SP_MediaVolumeMuted))
        else:
            self.volumeButton.setIcon(self.style().standardIcon(QStyle.SP_MediaVolume))

    def handleError(self):
        self.playButton.setEnabled(False)
        self.errorLabel.setText("Error: " + self.mediaPlayer.errorString())

    def sizeHint(self):
        return QSize(250, self.volumeButton.height())

class ClickSlider(QtWidgets.QSlider):
    def mousePressEvent(self, event):
        super(ClickSlider, self).mousePressEvent(event)
        if event.button() == QtCore.Qt.LeftButton:
            val = self.pixelPosToRangeValue(event.pos())
            self.setValue(val)

    def pixelPosToRangeValue(self, pos):
        opt = QtWidgets.QStyleOptionSlider()
        self.initStyleOption(opt)
        gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt, QtWidgets.QStyle.SC_SliderGroove, self)
        sr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt, QtWidgets.QStyle.SC_SliderHandle, self)

        if self.orientation() == QtCore.Qt.Horizontal:
            sliderLength = sr.width()
            sliderMin = gr.x()
            sliderMax = gr.right() - sliderLength + 1
        else:
            sliderLength = sr.height()
            sliderMin = gr.y()
            sliderMax = gr.bottom() - sliderLength + 1;
        pr = pos - sr.center() + sr.topLeft()
        p = pr.x() if self.orientation() == QtCore.Qt.Horizontal else pr.y()
        return QtWidgets.QStyle.sliderValueFromPosition(self.minimum(), self.maximum(), p - sliderMin,
                                               sliderMax - sliderMin, opt.upsideDown)

if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)

    player = VideoPlayer()
    player.resize(320, 240)
    player.show()

    sys.exit(app.exec_())