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docs/manual/highlevel-xml.xml: Fix XML example code. Fixes #472714.

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Original commit message from CVS:
* docs/manual/highlevel-xml.xml:
Fix XML example code. Fixes #472714.
This commit is contained in:
Wim Taymans 2007-09-05 22:29:58 +00:00
parent 851eaad606
commit d845f192ae
2 changed files with 32 additions and 46 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2007-09-05 Wim Taymans <wim.taymans@gmail.com>
* docs/manual/highlevel-xml.xml:
Fix XML example code. Fixes #472714.
2007-09-05 Wim Taymans <wim.taymans@gmail.com>
* libs/gst/base/gstbasesink.c: (gst_base_sink_preroll_queue_flush),

73
docs/manual/highlevel-xml.xml
View file

@ -1,11 +1,8 @@
<chapter id="chapter-xml">
<title>XML in <application>GStreamer</application></title>
<para>
<application>GStreamer</application> uses XML to store and load
its pipeline definitions. XML is also used internally to manage the
plugin registry. The plugin registry is a file that contains the definition
of all the plugins <application>GStreamer</application> knows about to have
quick access to the specifics of the plugins.
<application>GStreamer</application> can use XML to store and load
its pipeline definitions.
</para>
<para>
@ -19,7 +16,7 @@
<para>
We create a simple pipeline and write it to stdout with
gst_xml_write_file (). The following code constructs an MP3 player
pipeline with two threads and then writes out the XML both to stdout
pipeline and then writes out the XML both to stdout
and to a file. Use this program with one argument: the MP3 file on disk.
</para>
@ -33,9 +30,8 @@ gboolean playing;
int
main (int argc, char *argv[])
{
GstElement *filesrc, *osssink, *queue, *queue2, *decode;
GstElement *bin;
GstElement *thread, *thread2;
GstElement *filesrc, *osssink, *decode;
GstElement *pipeline;
gst_init (&amp;argc,&amp;argv);
@ -44,24 +40,15 @@ main (int argc, char *argv[])
exit (-1);
}
/* create a new thread to hold the elements */
thread = gst_element_factory_make ("thread", "thread");
g_assert (thread != NULL);
thread2 = gst_element_factory_make ("thread", "thread2");
g_assert (thread2 != NULL);
/* create a new bin to hold the elements */
bin = gst_bin_new ("bin");
g_assert (bin != NULL);
/* create a new pipeline to hold the elements */
pipeline = gst_element_factory_make ("pipeline", "pipeline");
g_assert (pipeline != NULL);
/* create a disk reader */
filesrc = gst_element_factory_make ("filesrc", "disk_source");
g_assert (filesrc != NULL);
g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
queue = gst_element_factory_make ("queue", "queue");
queue2 = gst_element_factory_make ("queue", "queue2");
/* and an audio sink */
osssink = gst_element_factory_make ("osssink", "play_audio");
g_assert (osssink != NULL);
@ -69,22 +56,16 @@ main (int argc, char *argv[])
decode = gst_element_factory_make ("mad", "decode");
g_assert (decode != NULL);
/* add objects to the main bin */
gst_bin_add_many (GST_BIN (bin), filesrc, queue, NULL);
/* add objects to the main pipeline */
gst_bin_add_many (GST_BIN (pipeline), filesrc, decode, osssink, NULL);
gst_bin_add_many (GST_BIN (thread), decode, queue2, NULL);
gst_element_link_many (filesrc, decode, osssink, NULL);
gst_bin_add (GST_BIN (thread2), osssink);
gst_element_link_many (filesrc, queue, decode, queue2, osssink, NULL);
gst_bin_add_many (GST_BIN (bin), thread, thread2, NULL);
/* write the bin to stdout */
gst_xml_write_file (GST_ELEMENT (bin), stdout);
/* write the pipeline to stdout */
gst_xml_write_file (GST_ELEMENT (pipeline), stdout);
/* write the bin to a file */
gst_xml_write_file (GST_ELEMENT (bin), fopen ("xmlTest.gst", "w"));
gst_xml_write_file (GST_ELEMENT (pipeline), fopen ("xmlTest.gst", "w"));
exit (0);
}
@ -94,7 +75,7 @@ main (int argc, char *argv[])
The most important line is:
</para>
<programlisting>
gst_xml_write_file (GST_ELEMENT (bin), stdout);
gst_xml_write_file (GST_ELEMENT (pipeline), stdout);
</programlisting>
<para>
gst_xml_write_file () will turn the given element into an xmlDocPtr that
@ -125,7 +106,7 @@ int
main(int argc, char *argv[])
{
GstXML *xml;
GstElement *bin;
GstElement *pipeline;
gboolean ret;
gst_init (&amp;argc, &amp;argv);
@ -135,14 +116,14 @@ main(int argc, char *argv[])
ret = gst_xml_parse_file(xml, "xmlTest.gst", NULL);
g_assert (ret == TRUE);
bin = gst_xml_get_element (xml, "bin");
g_assert (bin != NULL);
pipeline = gst_xml_get_element (xml, "pipeline");
g_assert (pipeline != NULL);
gst_element_set_state (bin, GST_STATE_PLAYING);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
while (gst_bin_iterate(GST_BIN(bin)));
g_sleep (4);
gst_element_set_state (bin, GST_STATE_NULL);
gst_element_set_state (pipeline, GST_STATE_NULL);
exit (0);
}
@ -186,9 +167,9 @@ xmlNsPtr ns;
...
ns = xmlNewNs (NULL, "http://gstreamer.net/gst-test/1.0/", "test");
...
thread = gst_element_factory_make ("thread", "thread");
g_signal_connect (G_OBJECT (thread), "object_saved",
G_CALLBACK (object_saved), g_strdup ("decoder thread"));
pipeline = gst_element_factory_make ("pipeline", "pipeline");
g_signal_connect (G_OBJECT (pipeline), "object_saved",
G_CALLBACK (object_saved), g_strdup ("decoder pipeline"));
...
</programlisting>
<para>
@ -212,13 +193,13 @@ object_saved (GstObject *object, xmlNodePtr parent, gpointer data)
<programlisting>
...
&lt;gst:element&gt;
&lt;gst:name&gt;thread&lt;/gst:name&gt;
&lt;gst:type&gt;thread&lt;/gst:type&gt;
&lt;gst:name&gt;pipeline&lt;/gst:name&gt;
&lt;gst:type&gt;pipeline&lt;/gst:type&gt;
&lt;gst:version&gt;0.1.0&lt;/gst:version&gt;
...
&lt;/gst:children&gt;
&lt;test:comment&gt;
&lt;test:text&gt;decoder thread&lt;/test:text&gt;
&lt;test:text&gt;decoder pipeline&lt;/test:text&gt;
&lt;/test:comment&gt;
&lt;/gst:element&gt;
...