music.py

#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2010 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * 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
##     distribution.
##   * 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
##     permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################


# This is only needed for Python v2 but is harmless for Python v3.
import sip
sip.setapi('QString', 2)

import sys

from PyQt4 import QtCore, QtGui

try:
    from PyQt4.phonon import Phonon
except ImportError:
    app = QtGui.QApplication(sys.argv)
    QtGui.QMessageBox.critical(None, "Music Player",
            "Your Qt installation does not have Phonon support.",
            QtGui.QMessageBox.Ok | QtGui.QMessageBox.Default,
            QtGui.QMessageBox.NoButton)
    sys.exit(1)


class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(QtGui.QMainWindow, self).__init__()

        self.audioOutput = Phonon.AudioOutput(Phonon.MusicCategory, self)
        self.mediaObject = Phonon.MediaObject(self)
        self.metaInformationResolver = Phonon.MediaObject(self)

        self.mediaObject.setTickInterval(1000)

        self.mediaObject.tick.connect(self.tick)
        self.mediaObject.stateChanged.connect(self.stateChanged)
        self.metaInformationResolver.stateChanged.connect(self.metaStateChanged)
        self.mediaObject.currentSourceChanged.connect(self.sourceChanged)
        self.mediaObject.aboutToFinish.connect(self.aboutToFinish)

        Phonon.createPath(self.mediaObject, self.audioOutput)

        self.setupActions()
        self.setupMenus()
        self.setupUi()
        self.timeLcd.display("00:00") 

        self.sources = []

    def sizeHint(self):
        return QtCore.QSize(500, 300)

    def addFiles(self):
        files = QtGui.QFileDialog.getOpenFileNames(self, "Select Music Files",
                QtGui.QDesktopServices.storageLocation(QtGui.QDesktopServices.MusicLocation))

        if not files:
            return

        index = len(self.sources)

        for string in files:
            self.sources.append(Phonon.MediaSource(string))

        if self.sources:
            self.metaInformationResolver.setCurrentSource(self.sources[index])

    def about(self):
        QtGui.QMessageBox.information(self, "About Music Player",
                "The Music Player example shows how to use Phonon - the "
                "multimedia framework that comes with Qt - to create a "
                "simple music player.")

    def stateChanged(self, newState, oldState):
        if newState == Phonon.ErrorState:
            if self.mediaObject.errorType() == Phonon.FatalError:
                QtGui.QMessageBox.warning(self, "Fatal Error",
                        self.mediaObject.errorString())
            else:
                QtGui.QMessageBox.warning(self, "Error",
                        self.mediaObject.errorString())

        elif newState == Phonon.PlayingState:
            self.playAction.setEnabled(False)
            self.pauseAction.setEnabled(True)
            self.stopAction.setEnabled(True)

        elif newState == Phonon.StoppedState:
            self.stopAction.setEnabled(False)
            self.playAction.setEnabled(True)
            self.pauseAction.setEnabled(False)
            self.timeLcd.display("00:00")

        elif newState == Phonon.PausedState:
            self.pauseAction.setEnabled(False)
            self.stopAction.setEnabled(True)
            self.playAction.setEnabled(True)

    def tick(self, time):
        displayTime = QtCore.QTime(0, (time / 60000) % 60, (time / 1000) % 60)
        self.timeLcd.display(displayTime.toString('mm:ss'))

    def tableClicked(self, row, column):
        wasPlaying = (self.mediaObject.state() == Phonon.PlayingState)

        self.mediaObject.stop()
        self.mediaObject.clearQueue()

        self.mediaObject.setCurrentSource(self.sources[row])

        if wasPlaying:
            self.mediaObject.play()
        else:
            self.mediaObject.stop()

    def sourceChanged(self, source):
        self.musicTable.selectRow(self.sources.index(source))
        self.timeLcd.display('00:00')

    def metaStateChanged(self, newState, oldState):
        if newState == Phonon.ErrorState:
            QtGui.QMessageBox.warning(self, "Error opening files",
                    self.metaInformationResolver.errorString())

            while self.sources and self.sources.pop() != self.metaInformationResolver.currentSource():
                pass

            return

        if newState != Phonon.StoppedState and newState != Phonon.PausedState:
            return

        if self.metaInformationResolver.currentSource().type() == Phonon.MediaSource.Invalid:
            return

        metaData = self.metaInformationResolver.metaData()

        title = metaData.get('TITLE', [''])[0]
        if not title:
            title = self.metaInformationResolver.currentSource().fileName()

        titleItem = QtGui.QTableWidgetItem(title)
        titleItem.setFlags(titleItem.flags() ^ QtCore.Qt.ItemIsEditable)

        artist = metaData.get('ARTIST', [''])[0]
        artistItem = QtGui.QTableWidgetItem(artist)
        artistItem.setFlags(artistItem.flags() ^ QtCore.Qt.ItemIsEditable)

        album = metaData.get('ALBUM', [''])[0]
        albumItem = QtGui.QTableWidgetItem(album)
        albumItem.setFlags(albumItem.flags() ^ QtCore.Qt.ItemIsEditable)

        year = metaData.get('DATE', [''])[0]
        yearItem = QtGui.QTableWidgetItem(year)
        yearItem.setFlags(yearItem.flags() ^ QtCore.Qt.ItemIsEditable)

        currentRow = self.musicTable.rowCount()
        self.musicTable.insertRow(currentRow)
        self.musicTable.setItem(currentRow, 0, titleItem)
        self.musicTable.setItem(currentRow, 1, artistItem)
        self.musicTable.setItem(currentRow, 2, albumItem)
        self.musicTable.setItem(currentRow, 3, yearItem)

        if not self.musicTable.selectedItems():
            self.musicTable.selectRow(0)
            self.mediaObject.setCurrentSource(self.metaInformationResolver.currentSource())

        index = self.sources.index(self.metaInformationResolver.currentSource()) + 1

        if len(self.sources) > index:
            self.metaInformationResolver.setCurrentSource(self.sources[index])
        else:
            self.musicTable.resizeColumnsToContents()
            if self.musicTable.columnWidth(0) > 300:
                self.musicTable.setColumnWidth(0, 300)

    def aboutToFinish(self):
        index = self.sources.index(self.mediaObject.currentSource()) + 1
        if len(self.sources) > index:
            self.mediaObject.enqueue(self.sources[index])

    def setupActions(self):
        self.playAction = QtGui.QAction(
                self.style().standardIcon(QtGui.QStyle.SP_MediaPlay), "Play",
                self, shortcut="Ctrl+P", enabled=False,
                triggered=self.mediaObject.play)

        self.pauseAction = QtGui.QAction(
                self.style().standardIcon(QtGui.QStyle.SP_MediaPause),
                "Pause", self, shortcut="Ctrl+A", enabled=False,
                triggered=self.mediaObject.pause)

        self.stopAction = QtGui.QAction(
                self.style().standardIcon(QtGui.QStyle.SP_MediaStop), "Stop",
                self, shortcut="Ctrl+S", enabled=False,
                triggered=self.mediaObject.stop)

        self.nextAction = QtGui.QAction(
                self.style().standardIcon(QtGui.QStyle.SP_MediaSkipForward),
                "Next", self, shortcut="Ctrl+N")

        self.previousAction = QtGui.QAction(
                self.style().standardIcon(QtGui.QStyle.SP_MediaSkipBackward),
                "Previous", self, shortcut="Ctrl+R")

        self.addFilesAction = QtGui.QAction("Add &Files", self,
                shortcut="Ctrl+F", triggered=self.addFiles)

        self.exitAction = QtGui.QAction("E&xit", self, shortcut="Ctrl+X",
                triggered=self.close)

        self.aboutAction = QtGui.QAction("A&bout", self, shortcut="Ctrl+B",
                triggered=self.about)

        self.aboutQtAction = QtGui.QAction("About &Qt", self,
                shortcut="Ctrl+Q", triggered=QtGui.qApp.aboutQt)

    def setupMenus(self):
        fileMenu = self.menuBar().addMenu("&File")
        fileMenu.addAction(self.addFilesAction)
        fileMenu.addSeparator()
        fileMenu.addAction(self.exitAction)

        aboutMenu = self.menuBar().addMenu("&Help")
        aboutMenu.addAction(self.aboutAction)
        aboutMenu.addAction(self.aboutQtAction)

    def setupUi(self):
        bar = QtGui.QToolBar()

        bar.addAction(self.playAction)
        bar.addAction(self.pauseAction)
        bar.addAction(self.stopAction)

        self.seekSlider = Phonon.SeekSlider(self)
        self.seekSlider.setMediaObject(self.mediaObject)

        self.volumeSlider = Phonon.VolumeSlider(self)
        self.volumeSlider.setAudioOutput(self.audioOutput)
        self.volumeSlider.setSizePolicy(QtGui.QSizePolicy.Maximum,
                QtGui.QSizePolicy.Maximum)

        volumeLabel = QtGui.QLabel()
        volumeLabel.setPixmap(QtGui.QPixmap('images/volume.png'))

        palette = QtGui.QPalette()
        palette.setBrush(QtGui.QPalette.Light, QtCore.Qt.darkGray)

        self.timeLcd = QtGui.QLCDNumber()
        self.timeLcd.setPalette(palette)

        headers = ("Title", "Artist", "Album", "Year")

        self.musicTable = QtGui.QTableWidget(0, 4)
        self.musicTable.setHorizontalHeaderLabels(headers)
        self.musicTable.setSelectionMode(QtGui.QAbstractItemView.SingleSelection)
        self.musicTable.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
        self.musicTable.cellPressed.connect(self.tableClicked)

        seekerLayout = QtGui.QHBoxLayout()
        seekerLayout.addWidget(self.seekSlider)
        seekerLayout.addWidget(self.timeLcd)

        playbackLayout = QtGui.QHBoxLayout()
        playbackLayout.addWidget(bar)
        playbackLayout.addStretch()
        playbackLayout.addWidget(volumeLabel)
        playbackLayout.addWidget(self.volumeSlider)

        mainLayout = QtGui.QVBoxLayout()
        mainLayout.addWidget(self.musicTable)
        mainLayout.addLayout(seekerLayout)
        mainLayout.addLayout(playbackLayout)

        widget = QtGui.QWidget()
        widget.setLayout(mainLayout)

        self.setCentralWidget(widget)
        self.setWindowTitle("Phonon Music Player")


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    app.setApplicationName("Music Player")
    app.setQuitOnLastWindowClosed(True)

    window = MainWindow()
    window.show()

    sys.exit(app.exec_())