在Gtk3 3/Gstreamer应用程序中不播放音乐

Question

我看过本教程，http://lzone.de/media+player+with+gstreamer+and+pygi，关于如何使用Gtk3和Gstreamer从网络上传输音频。我有工作代码减去实际播放音乐的能力。我需要帮助，我刚开始开发应用程序，但我认为问题来自于self.player.set_property('uri'，self.uri)，而不是用它的魔力从url self.uri = 'http://mp3channels.webradio.antenne.de/chillout‘获取音乐。

这是我的消息来源：

import sys, os, pygtk
import gi
gi.require_version('Gst', '1.0')
from gi.repository import GObject
from gi.repository import GLib
from gi.repository import Gtk
from gi.repository import Gst
GObject.threads_init()
Gst.init(None)

类PlaybackInterface()：

def __init__(self):
    self.playing = False
# A free example sound track
    self.uri = 'http://mp3channels.webradio.antenne.de/chillout'
# GTK window and widgets
    self.window = Gtk.Window()
    self.window.set_size_request(300,50)
    vbox = Gtk.Box(Gtk.Orientation.HORIZONTAL, 0)
    vbox.set_margin_top(3)
    vbox.set_margin_bottom(3)
    self.window.add(vbox)
    self.playButtonImage = Gtk.Image()
    self.playButtonImage.set_from_stock("gtk-media-play", Gtk.IconSize.BUTTON)
    self.playButton = Gtk.Button.new()
    self.playButton.add(self.playButtonImage)
    self.playButton.connect("clicked", self.playToggled)
    Gtk.Box.pack_start(vbox, self.playButton, False, False, 0)
    self.slider = Gtk.HScale()
    self.slider.set_margin_left(6)
    self.slider.set_margin_right(6)
    self.slider.set_draw_value(False)
    self.slider.set_range(0, 100)
    self.slider.set_increments(1, 10)
    Gtk.Box.pack_start(vbox, self.slider, True, True, 0)
    self.label = Gtk.Label(label='0:00')
    self.label.set_margin_left(6)
    self.label.set_margin_right(6)
    Gtk.Box.pack_start(vbox, self.label, False, False, 0)
    self.window.show_all()

    # GStreamer Setup
    self.player = Gst.ElementFactory.make('playbin', None)
    self.player.set_property('uri', self.uri)
    # Set properties
    # bus = self.player.get_bus()
    # bus.connect("message", self.on_message)
    # self.player.connect("about-to-finish",  self.on_finished)

def on_message(self, bus, message):
    t = message.type
    if t == Gst.Message.EOS:
        self.player.set_state(Gst.State.NULL)
        self.playing = False
    elif t == Gst.Message.ERROR:
        self.player.set_state(Gst.State.NULL)
        err, debug = message.parse_error()
        print "Error: %s" % err, debug
        self.playing = False

    self.updateButtons()

def on_finished(self, player):
    self.playing = False
    self.slider.set_value(0)
    self.label.set_text("0:00")
    self.updateButtons()

def play(self):
    self.player.set_state(Gst.State.PLAYING)
    GObject.timeout_add(1000, self.updateSlider)

def stop(self):
    self.player.set_state(Gst.State.NULL)

def playToggled(self, w):
    self.slider.set_value(0)
    self.label.set_text("0:00")

    if(self.playing == False):
        self.play()
    else:
        self.stop()

    self.playing=not(self.playing)
    self.updateButtons()

def updateSlider(self):

    if(self.playing == False):
        return False # cancel timeout
        try:
            if self.IS_GST010:
                nanosecs = self.player.query_position(Gst.Format.TIME)[2]
                duration_nanosecs = self.player.query_duration(Gst.Format.TIME)[2]
            else:
                nanosecs = self.player.query_position(Gst.Format.TIME)[1]
                duration_nanosecs = self.player.query_duration(Gst.Format.TIME)[1]
                        # block seek handler so we don't seek when we set_value()
                        # self.slider.handler_block_by_func(self.on_slider_change)
                duration = float(duration_nanosecs) / Gst.SECOND
                position = float(nanosecs) / Gst.SECOND
                self.slider.set_range(0, duration)
                self.slider.set_value(position)
                self.label.set_text ("%d" % (position / 60) + ":%02d" % (position % 60))

        except Exception as e:
# pipeline must not be ready and does not know position
            print e
            pass
        return True

def updateButtons(self):
    if(self.playing == False):
        self.playButtonImage.set_from_stock("gtk-media-play", Gtk.IconSize.BUTTON)
    else:
        self.playButtonImage.set_from_stock("gtk-media-stop", Gtk.IconSize.BUTTON)



player = PlaybackInterface()
Gtk.main()

Answer 1

Gstreamer有很多依赖项。查看链接https://raw.githubusercontent.com/Psychtoolbox-3/Psychtoolbox-3/beta/Psychtoolbox/PsychDocumentation/GStreamer.m。我将工作代码上传到我的Github帐户(至少在我的机器上)，它将播放并停止来自http源的音频流。https://github.com/jchiefelk/musicplayer