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removed objects destroyed after pipeline unref

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Dan Taylor-2
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removed objects destroyed after pipeline unref

Dan Taylor-2
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?

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-2
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Re: removed objects destroyed after pipeline unref

Thiago Sousa Santos-2


On Fri, Feb 6, 2009 at 9:13 PM, Dan Taylor <[hidden email]> 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.


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)

------------------------------------------------------------------------------
Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM)
software. With Adobe AIR, Ajax developers can use existing skills and code to
build responsive, highly engaging applications that combine the power of local
resources and data with the reach of the web. Download the Adobe AIR SDK and
Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com
_______________________________________________
gstreamer-devel mailing list
[hidden email]
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