[gst-devel] removed objects destroyed after pipeline unref
thiagoss
thiagossantos at gmail.com
Sat Feb 7 02:04:08 CET 2009
On Fri, Feb 6, 2009 at 9:13 PM, Dan Taylor <dtaylor at startrac.com> wrote:
> I am trying to use multiple frontends to feed an audio/video backend
> pair.
>
> When I switch frontends, I unlink the front/back ends, remove them from
> their respective pipelines and unref the pipelines. After I have done
> that,
> the backend object has been destroyed.
>
> I've attached a code snippet and XML dumps of an affected object before
> it
> is removed from the pipeline, the pipeline after removal, and the
> complaint
> about the object after it is removed.
>
> With the object removed from the pipeline, unreffing the pipeline
> shouldn't
> change any of the objects it used to contain. Any hints about what I've
> missed?
Removing them from the bin unrefs them.
Maybe this will clarify:
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBin.html#gst-bin-remove
>
> Sorry about the length of the xml.
>
> Code:
>
> gst_element_set_state (GST_ELEMENT (audio_pipeline),
> GST_STATE_NULL);
>
> /* unlink ends */
> unlink_backend_sink(audio_backend);
>
> if (dump_xml) gst_xml_write_file (GST_ELEMENT (audio_backend),
> stdout);
>
> /* remove them from bin, so they are not freed */
> gst_bin_remove_many(GST_BIN (audio_pipeline), audio_frontend,
> audio_backend, NULL);
>
> if (dump_xml) gst_xml_write_file (GST_ELEMENT (audio_pipeline),
> stdout);
>
> gst_object_unref (audio_pipeline);
> audio_pipeline = NULL;
>
> if (dump_xml) gst_xml_write_file (GST_ELEMENT (audio_backend),
> stdout);
>
> Messages and debug prints:
>
> backend audio_backend
> backend unlink successful
>
> <?xml version="1.0"?>
> <gstreamer xmlns:gst="http://gstreamer.net/gst-core/1.0/">
> <gst:element>
> <gst:name>audio_backend</gst:name>
> <gst:type>bin</gst:type>
> <gst:param>
> <gst:name>name</gst:name>
> <gst:value>audio_backend</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>async-handling</gst:name>
> <gst:value>FALSE</gst:value>
> </gst:param>
> <gst:pad>
> <gst:ghostpad>
> <gst:name>ghost3</gst:name>
> <gst:parent>audio_backend</gst:parent>
> <gst:direction>sink</gst:direction>
> <gst:peer>audio_frontend.ghost2</gst:peer>
> </gst:ghostpad>
> </gst:pad>
> <gst:children>
> <gst:element>
> <gst:name>alsasink0</gst:name>
> <gst:type>alsasink</gst:type>
> <gst:param>
> <gst:name>name</gst:name>
> <gst:value>alsasink0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>preroll-queue-len</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>sync</gst:name>
> <gst:value>TRUE</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>max-lateness</gst:name>
> <gst:value>-1</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>qos</gst:name>
> <gst:value>FALSE</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>async</gst:name>
> <gst:value>TRUE</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>ts-offset</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>last-buffer</gst:name>
> <gst:value>NULL</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>buffer-time</gst:name>
> <gst:value>200000</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>latency-time</gst:name>
> <gst:value>10000</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>provide-clock</gst:name>
> <gst:value>TRUE</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>slave-method</gst:name>
> <gst:value>1</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>device</gst:name>
> <gst:value>default</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>device-name</gst:name>
> <gst:value/>
> </gst:param>
> <gst:pad>
> <gst:name>sink</gst:name>
> <gst:direction>sink</gst:direction>
> <gst:peer>audioconvert0.src</gst:peer>
> </gst:pad>
> </gst:element>
> <gst:element>
> <gst:name>audioconvert0</gst:name>
> <gst:type>audioconvert</gst:type>
> <gst:param>
> <gst:name>name</gst:name>
> <gst:value>audioconvert0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>qos</gst:name>
> <gst:value>FALSE</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>dithering</gst:name>
> <gst:value>2</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>noise-shaping</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:pad>
> <gst:name>src</gst:name>
> <gst:direction>source</gst:direction>
> <gst:peer>alsasink0.sink</gst:peer>
> </gst:pad>
> <gst:pad>
> <gst:name>sink</gst:name>
> <gst:direction>sink</gst:direction>
> <gst:peer>audio_q.src</gst:peer>
> </gst:pad>
> </gst:element>
> <gst:element>
> <gst:name>audio_q</gst:name>
> <gst:type>queue</gst:type>
> <gst:param>
> <gst:name>name</gst:name>
> <gst:value>audio_q</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>current-level-buffers</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>current-level-bytes</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>current-level-time</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>max-size-buffers</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>max-size-bytes</gst:name>
> <gst:value>10485760</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>max-size-time</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>min-threshold-buffers</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>min-threshold-bytes</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>min-threshold-time</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>leaky</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:pad>
> <gst:name>src</gst:name>
> <gst:direction>source</gst:direction>
> <gst:peer>audioconvert0.sink</gst:peer>
> </gst:pad>
> <gst:pad>
> <gst:name>sink</gst:name>
> <gst:direction>sink</gst:direction>
> <gst:peer/>
> </gst:pad>
> </gst:element>
> </gst:children>
> </gst:element>
> </gstreamer>
>
> <?xml version="1.0"?>
> <gstreamer xmlns:gst="http://gstreamer.net/gst-core/1.0/">
> <gst:element>
> <gst:name>audio_pipeline</gst:name>
> <gst:type>pipeline</gst:type>
> <gst:param>
> <gst:name>name</gst:name>
> <gst:value>audio_pipeline</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>async-handling</gst:name>
> <gst:value>FALSE</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>delay</gst:name>
> <gst:value>0</gst:value>
> </gst:param>
> <gst:param>
> <gst:name>auto-flush-bus</gst:name>
> <gst:value>TRUE</gst:value>
> </gst:param>
> <gst:children/>
> </gst:element>
> </gstreamer>
>
> (avMediaDaemon:22708): GLib-GObject-WARNING **: invalid uninstantiatable
> type `(null)' in cast to `GstElement'
>
> (avMediaDaemon:22708): GLib-GObject-WARNING **: invalid uninstantiatable
> type `(null)' in cast to `GstObject'
>
> (avMediaDaemon:22708): GStreamer-CRITICAL **: gst_object_save_thyself:
> assertion `GST_IS_OBJECT (object)' failed
>
> <?xml version="1.0"?>
> <gstreamer xmlns:gst="http://gstreamer.net/gst-core/1.0/">
> <gst:element/>
> </gstreamer>
>
>
>
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--
Thiago Sousa Santos
Embedded Systems and Pervasive Computing Lab (Embedded)
Center of Electrical Engineering and Informatics (CEEI)
Federal University of Campina Grande (UFCG)
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