[Bug 679856] New: Can't read nested structures from python/gi

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Fri Jul 13 06:34:31 PDT 2012 

https://bugzilla.gnome.org/show_bug.cgi?id=679856
  GStreamer | gstreamer (core) | 0.11.x

           Summary: Can't read nested structures from python/gi
    Classification: Platform
           Product: GStreamer
           Version: 0.11.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: h at realh.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Some Gst.Structures contain members which are arrays/lists of other structures,
for example the dvbsrc element posts messages about the DVB SI, including a
"nit" message with a "transports" member which contains a list/array of other
structures. With the old (0.10) python bindings I could read this member by
using struct["transports"] and iterate over the python list it returned. But in
gi there is no get_* method for a list/array. I tried get_value() but it causes
an exception:

TypeError: unknown type GstValueList

I'm also thinking, wouldn't I have the same problem in C?

Gst.Structure.foreach() seems not to be working too. If I call it on the entire
nit structure with a function that does print("  %s: %s" % (name, value)), it
prints, for example:

  2168: 12340
  2165: 17
  2169: 1
  2170: True
  2171: South
  2166: ['@\x05South', '\x7f%\nGBRengGEngland\x01\x85South\x01\x0f\x8aSouth
East\x01\x17', '\x7f\n\tGBR\xfa\x01\x0f\xfa\x01\x17',
'J\x0c\x10C#:\x11@\t\x04\x00\x01Z\x00', 'J\x0c\x10L#:\x11@\t\x04\x00\x01Z\x00',
'J\x0c@\x83#:D@\t\x04\x00\x01Z\x00', '\x7f\x9b\x08\xffengNetwork change
notification; enhanced network configuration; Version 2.0      Network change
notification; enhanced network configuration; Version 2.0']

But if I print the output of the same structure's to_string() method it's
completely different:

 nit, network-id=(uint)12340, version-number=(uint)17,
current-next-indicator=(uint)1, actual-network=(boolean)true,
network-name=(string)South, descriptors=(GValueArray)NULL,
transports=(structure){ "transport-4163\,\ transport-stream-id\=\(uint\)4163\,\
original-network-id\=\(uint\)9018\,\
delivery\=\(structure\)\"terrestrial\\\,\\\
frequency\\\=\\\(uint\\\)498000000\\\,\\\ bandwidth\\\=\\\(uint\\\)8\\\,\\\
constellation\\\=\\\(string\\\)QAM64\\\,\\\ hierarchy\\\=\\\(uint\\\)0\\\,\\\
code-rate-hp\\\=\\\(string\\\)2/3\\\,\\\
code-rate-lp\\\=\\\(string\\\)1/2\\\,\\\
guard-interval\\\=\\\(uint\\\)32\\\,\\\
transmission-mode\\\=\\\(string\\\)8k\\\,\\\
other-frequency\\\=\\\(boolean\\\)true\\\;\"\,\ channels\=\(structure\)\{\
\"channels\\\,\\\ service-id\\\=\\\(uint\\\)4163\\\,\\\
logical-channel-number\\\=\\\(uint\\\)1\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4288\\\,\\\
logical-channel-number\\\=\\\(uint\\\)7\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4672\\\,\\\
logical-channel-number\\\=\\\(uint\\\)71\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6848\\\,\\\
logical-channel-number\\\=\\\(uint\\\)703\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5760\\\,\\\
logical-channel-number\\\=\\\(uint\\\)707\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4416\\\,\\\
logical-channel-number\\\=\\\(uint\\\)105\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4544\\\,\\\
logical-channel-number\\\=\\\(uint\\\)9\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4736\\\,\\\
logical-channel-number\\\=\\\(uint\\\)81\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5632\\\,\\\
logical-channel-number\\\=\\\(uint\\\)705\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5888\\\,\\\
logical-channel-number\\\=\\\(uint\\\)701\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)7168\\\,\\\
logical-channel-number\\\=\\\(uint\\\)301\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5952\\\,\\\
logical-channel-number\\\=\\\(uint\\\)709\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4287\\\,\\\
logical-channel-number\\\=\\\(uint\\\)2\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4608\\\,\\\
logical-channel-number\\\=\\\(uint\\\)70\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6016\\\,\\\
logical-channel-number\\\=\\\(uint\\\)710\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6784\\\,\\\
logical-channel-number\\\=\\\(uint\\\)702\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)7232\\\,\\\
logical-channel-number\\\=\\\(uint\\\)302\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5696\\\,\\\
logical-channel-number\\\=\\\(uint\\\)706\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4352\\\,\\\
logical-channel-number\\\=\\\(uint\\\)80\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6912\\\,\\\
logical-channel-number\\\=\\\(uint\\\)704\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5824\\\,\\\
logical-channel-number\\\=\\\(uint\\\)708\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6720\\\,\\\
logical-channel-number\\\=\\\(uint\\\)700\\\;\"\ \}\,\
descriptors\=\(GValueArray\)NULL\;", "transport-4172\,\
transport-stream-id\=\(uint\)4172\,\ original-network-id\=\(uint\)9018\,\
delivery\=\(structure\)\"terrestrial\\\,\\\
frequency\\\=\\\(uint\\\)674000000\\\,\\\ bandwidth\\\=\\\(uint\\\)8\\\,\\\
constellation\\\=\\\(string\\\)QAM64\\\,\\\ hierarchy\\\=\\\(uint\\\)0\\\,\\\
code-rate-hp\\\=\\\(string\\\)2/3\\\,\\\
code-rate-lp\\\=\\\(string\\\)1/2\\\,\\\
guard-interval\\\=\\\(uint\\\)32\\\,\\\
transmission-mode\\\=\\\(string\\\)8k\\\,\\\
other-frequency\\\=\\\(boolean\\\)true\\\;\"\,\ channels\=\(structure\)\{\
\"channels\\\,\\\ service-id\\\=\\\(uint\\\)4172\\\,\\\
logical-channel-number\\\=\\\(uint\\\)1\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4288\\\,\\\
logical-channel-number\\\=\\\(uint\\\)7\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4672\\\,\\\
logical-channel-number\\\=\\\(uint\\\)71\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6848\\\,\\\
logical-channel-number\\\=\\\(uint\\\)703\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5760\\\,\\\
logical-channel-number\\\=\\\(uint\\\)707\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4416\\\,\\\
logical-channel-number\\\=\\\(uint\\\)105\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4544\\\,\\\
logical-channel-number\\\=\\\(uint\\\)9\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4736\\\,\\\
logical-channel-number\\\=\\\(uint\\\)81\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5632\\\,\\\
logical-channel-number\\\=\\\(uint\\\)705\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5888\\\,\\\
logical-channel-number\\\=\\\(uint\\\)701\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)7168\\\,\\\
logical-channel-number\\\=\\\(uint\\\)301\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5952\\\,\\\
logical-channel-number\\\=\\\(uint\\\)709\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4287\\\,\\\
logical-channel-number\\\=\\\(uint\\\)2\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4608\\\,\\\
logical-channel-number\\\=\\\(uint\\\)70\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6016\\\,\\\
logical-channel-number\\\=\\\(uint\\\)710\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6784\\\,\\\
logical-channel-number\\\=\\\(uint\\\)702\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)7232\\\,\\\
logical-channel-number\\\=\\\(uint\\\)302\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5696\\\,\\\
logical-channel-number\\\=\\\(uint\\\)706\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)4352\\\,\\\
logical-channel-number\\\=\\\(uint\\\)80\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6912\\\,\\\
logical-channel-number\\\=\\\(uint\\\)704\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)5824\\\,\\\
logical-channel-number\\\=\\\(uint\\\)708\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)6720\\\,\\\
logical-channel-number\\\=\\\(uint\\\)700\\\;\"\ \}\,\
descriptors\=\(GValueArray\)NULL\;", "transport-8206\,\
transport-stream-id\=\(uint\)8206\,\ original-network-id\=\(uint\)9018\,\
delivery\=\(structure\)\"terrestrial\\\,\\\
frequency\\\=\\\(uint\\\)522000000\\\,\\\ bandwidth\\\=\\\(uint\\\)8\\\,\\\
constellation\\\=\\\(string\\\)QAM64\\\,\\\ hierarchy\\\=\\\(uint\\\)0\\\,\\\
code-rate-hp\\\=\\\(string\\\)2/3\\\,\\\
code-rate-lp\\\=\\\(string\\\)1/2\\\,\\\
guard-interval\\\=\\\(uint\\\)32\\\,\\\
transmission-mode\\\=\\\(string\\\)8k\\\,\\\
other-frequency\\\=\\\(boolean\\\)true\\\;\"\,\ channels\=\(structure\)\{\
\"channels\\\,\\\ service-id\\\=\\\(uint\\\)8577\\\,\\\
logical-channel-number\\\=\\\(uint\\\)103\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8270\\\,\\\
logical-channel-number\\\=\\\(uint\\\)3\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8370\\\,\\\
logical-channel-number\\\=\\\(uint\\\)33\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8452\\\,\\\
logical-channel-number\\\=\\\(uint\\\)13\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8500\\\,\\\
logical-channel-number\\\=\\\(uint\\\)5\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8325\\\,\\\
logical-channel-number\\\=\\\(uint\\\)6\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8634\\\,\\\
logical-channel-number\\\=\\\(uint\\\)102\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8442\\\,\\\
logical-channel-number\\\=\\\(uint\\\)14\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8384\\\,\\\
logical-channel-number\\\=\\\(uint\\\)4\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)8448\\\,\\\
logical-channel-number\\\=\\\(uint\\\)28\\\;\"\ \}\,\
descriptors\=\(GValueArray\)NULL\;", "transport-16515\,\
transport-stream-id\=\(uint\)16515\,\ original-network-id\=\(uint\)9018\,\
channels\=\(structure\)\{\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)17603\\\,\\\
logical-channel-number\\\=\\\(uint\\\)51\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)20288\\\,\\\
logical-channel-number\\\=\\\(uint\\\)117\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)17472\\\,\\\
logical-channel-number\\\=\\\(uint\\\)54\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)17540\\\,\\\
logical-channel-number\\\=\\\(uint\\\)50\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)19648\\\,\\\
logical-channel-number\\\=\\\(uint\\\)304\\\;\"\,\ \"channels\\\,\\\
service-id\\\=\\\(uint\\\)17664\\\,\\\
logical-channel-number\\\=\\\(uint\\\)52\\\;\"\ \}\,\
descriptors\=\(GValueArray\)NULL\;" };

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