我正在尝试将一些pygtk音乐播放器代码移植到使用gst的发现者模块的pygi.

from gi.repository import Gst, GstPbutils

def on_discovered(discoverer, ismedia):
    print("%s -- %s" %( discoverer.tags.get('title', 'Unknown'),
                        discoverer.tags.get('artist', 'Unknown')))

Gst.init(None)
location = "file:///srv/Music/molly_hatchet-the_creeper.mp3"
discoverer = GstPbutils.Discoverer()
discoverer.discover_uri(location)
discoverer.connect('discovered', on_discovered)

当我尝试运行它时,我收到以下错误：

/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_object_get_qdata: assertion `G_IS_OBJECT (object)' failed
  return info.invoke(*args, **kwargs)
/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_object_ref_sink: assertion `G_IS_OBJECT (object)' failed
  return info.invoke(*args, **kwargs)

** (python:21482): CRITICAL **: pygobject_register_wrapper: assertion `PyObject_TypeCheck(self, &PyGObject_Type)' failed
/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_object_unref: assertion `G_IS_OBJECT (object)' failed
  return info.invoke(*args, **kwargs)

不幸的是,关于这个pygi模块的文档似乎有点稀疏.

解决方法:

以下是通用GST发现者调用的示例：

import sys

import gobject
gobject.threads_init()

import pygst
pygst.require('0.10')
import gst
from gst.extend.discoverer import Discoverer

def on_discovered(discoverer, ismedia, infile):
    print '\non_discovered:', infile
    discoverer.print_info()


if __name__ == '__main__':
    if len(sys.argv) >= 2:
        print 'Audio file: %s ' % sys.argv[0]
        discoverer = Discoverer(sys.argv[1])
        discoverer.connect('discovered', on_discovered, sys.argv[1])

        # The MainLoop
        mainloop = gobject.MainLoop()
        gobject.idle_add(discoverer.discover)
        mainloop.run()

    else:
        print 'Usage: %s <input_file>' % sys.argv[0]

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