gstreamer/docs/manual/basics-bins.xml
Ronald S. Bultje d0bcc34dad docs/manual/: Try 2. This time, include a short preface as a "general introduction", also add code blocks around all ...
Original commit message from CVS:
* docs/manual/advanced-autoplugging.xml:
* docs/manual/advanced-clocks.xml:
* docs/manual/advanced-interfaces.xml:
* docs/manual/advanced-metadata.xml:
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* docs/manual/advanced-schedulers.xml:
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* docs/manual/basics-bins.xml:
* docs/manual/basics-data.xml:
* docs/manual/basics-elements.xml:
* docs/manual/basics-helloworld.xml:
* docs/manual/basics-init.xml:
* docs/manual/basics-pads.xml:
* docs/manual/basics-plugins.xml:
* docs/manual/bins-api.xml:
* docs/manual/bins.xml:
* docs/manual/buffers-api.xml:
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Try 2. This time, include a short preface as a "general
introduction", also add code blocks around all code samples
so they get compiled. We still need a way to tell readers
the filename of the code sample. In some cases, don't show
all code in the documentation, but do include it in the generated
code. This allows for focussing on specific bits in the docs,
while still having a full test application available.
* examples/manual/Makefile.am:
Fix up examples for new ADM. Add several of the new examples that
were either added or were missing from the build system.
* examples/manual/extract.pl:
Allow nameless blocks.
2004-12-15 17:32:49 +00:00

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XML

<chapter id="chapter-bins">
<title>Bins</title>
<para>
A bin is a container element. You can add elements to a bin. Since a
bin is an element itself, a bin can be handled in the same way as any
other element. Therefore, the whole previous chapter (<xref
linkend="chapter-elements"/>) applies to bins as well.
</para>
<sect1 id="section-bins">
<title>What are bins</title>
<para>
Bins allow you to combine a group of linked elements into one
logical element. You do not deal with the individual elements
anymore but with just one element, the bin. We will see that
this is extremely powerful when you are going to construct
complex pipelines since it allows you to break up the pipeline
in smaller chunks.
</para>
<para>
The bin will also manage the elements contained in it. It will
figure out how the data will flow in the bin and generate an
optimal plan for that data flow. Plan generation is one of the
most complicated procedures in &GStreamer;. You will learn more
about this process, called scheduling, in <xref
linkend="chapter-scheduler"/>.
</para>
<figure float="1" id="section-bin-img">
<title>Visualisation of a bin with some elements in it</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/bin-element.&image;" format="&IMAGE;"/>
</imageobject>
</mediaobject>
</figure>
<para>
There are two specialized types of bins available to the
&GStreamer; programmer:
</para>
<itemizedlist>
<listitem>
<para>
A pipeline: a generic container that allows scheduling of the
containing elements. The toplevel bin has to be a pipeline.
Every application thus needs at least one of these. Applications
can iterate pipelines using <function>gst_bin_iterate
()</function> to make it process data while in the playing state.
</para>
</listitem>
<listitem>
<para>
A thread: a bin that will be run in a separate execution thread.
You will have to use this bin if you have to carefully
synchronize audio and video, or for buffering. You will learn
more about threads in <xref linkend="chapter-threads"/>.
</para>
</listitem>
</itemizedlist>
</sect1>
<sect1 id="section-bin-create">
<title>Creating a bin</title>
<para>
Bins are created in the same way that other elements are created,
i.e. using an element factory. There are also convenience functions
available (<function>gst_bin_new ()</function>,
<function>gst_thread_new ()</function> and <function>gst_pipeline_new
()</function>). To add elements to a bin or remove elements from a
bin, you can use <function>gst_bin_add ()</function> and
<function>gst_bin_remove ()</function>. Note that the bin that you
add an element to will take ownership of that element. If you
destroy the bin, the element will be dereferenced with it. If you
remove an element from a bin, it will be dereferenced automatically.
</para>
<programlisting><!-- example-begin bin.c a -->
#include &lt;gst/gst.h&gt;
int
main (int argc,
char *argv[])
{
GstElement *bin, *pipeline, *source, *sink;
/* init */
gst_init (&amp;argc, &amp;argv);
/* create */
pipeline = gst_pipeline_new ("my_pipeline");
bin = gst_pipeline_new ("my_bin");
source = gst_element_factory_make ("fakesrc", "source");
sink = gst_element_factory_make ("fakesink", "sink");
/* set up pipeline */
gst_bin_add_many (GST_BIN (bin), source, sink, NULL);
gst_bin_add (GST_BIN (pipeline), bin);
gst_element_link (source, sink);
<!-- example-end bin.c a -->
[..]<!-- example-begin bin.c b --><!--
return 0;
--><!-- example-end bin.c b -->
<!-- example-begin bin.c c -->
}
<!-- example-end bin.c c --></programlisting>
<para>
There are various functions to lookup elements in a bin. You can
also get a list of all elements that a bin contains using the function
<function>gst_bin_get_list ()</function>. See the API references of
<ulink type="http"
url="&URLAPI;GstBin.html"><classname>GstBin</classname></ulink>
for details.
</para>
</sect1>
<sect1 id="section-bin-custom">
<title>Custom bins</title>
<para>
The application programmer can create custom bins packed with elements
to perform a specific task. This allows you, for example, to write
an Ogg/Vorbis decoder with just the following lines of code:
</para>
<programlisting>
int
main (int argc
char *argv[])
{
GstElement *player;
/* init */
gst_init (&amp;argc, &amp;argv);
/* create player */
player = gst_element_factory_make ("oggvorbisplayer", "player");
/* set the source audio file */
g_object_set (G_OBJECT (player), "location", "helloworld.ogg", NULL);
/* start playback */
gst_element_set_state (GST_ELEMENT (mp3player), GST_STATE_PLAYING);
[..]
}
</programlisting>
<para>
Custom bins can be created with a plugin or an XML description. You
will find more information about creating custom bin in the <ulink
type="http"
url="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html">Plugin
Writers Guide</ulink>.
</para>
</sect1>
</chapter>