Sophie: libgstreamer0.7-devel-0.7.4-2mdk i586

libgstreamer0.7-devel-0.7.4-2mdk.i586.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML
><HEAD
><TITLE
>Getting Started</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
REL="HOME"
TITLE="GStreamer Plugin Writer's Guide"
HREF="index.html"><LINK
REL="UP"
TITLE="Supporting Dynamic Parameters"
HREF="chapter-dparams.html"><LINK
REL="PREVIOUS"
TITLE="Supporting Dynamic Parameters"
HREF="chapter-dparams.html"><LINK
REL="NEXT"
TITLE="Defining Parameter Specificiations"
HREF="section-dparam-define.html"></HEAD
><BODY
CLASS="sect1"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
><SPAN
CLASS="application"
>GStreamer</SPAN
> Plugin Writer's Guide</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="chapter-dparams.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 16. Supporting Dynamic Parameters</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="section-dparam-define.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="section-dparam-start"
>16.2. Getting Started</A
></H1
><P
>&#13;    The dparams subsystem is contained within the
    <TT
CLASS="filename"
>gstcontrol</TT
> library. You need to include the header in
    your element's source file:
  </P
><PRE
CLASS="programlisting"
>&#13;  #include &#60;gst/control/control.h&#62;
  </PRE
><P
>&#13;    Even though the <TT
CLASS="filename"
>gstcontrol</TT
> library may be linked into
    the host application, you should make sure it is loaded in your
    <TT
CLASS="filename"
>plugin_init</TT
> function:
  </P
><PRE
CLASS="programlisting"
>&#13;  static gboolean
  plugin_init (GModule *module, GstPlugin *plugin)
  {
    ...

    /* load dparam support library */
    if (!gst_library_load ("gstcontrol"))
    {
      gst_info ("example: could not load support library: 'gstcontrol'\n");
      return FALSE;
    }

    ...
  }
  </PRE
><P
>&#13;    You need to store an instance of <TT
CLASS="filename"
>GstDParamManager</TT
> in
    your element's struct:
  </P
><PRE
CLASS="programlisting"
>&#13;  struct _GstExample {
    GstElement element;
    ...

    GstDParamManager *dpman;

    ...
  };
  </PRE
><P
>&#13;    The <TT
CLASS="filename"
>GstDParamManager</TT
> can be initialised in your
    element's init function:
  </P
><PRE
CLASS="programlisting"
>&#13;  static void
  gst_example_init (GstExample *example)
  {
    ...

    example-&#62;dpman = gst_dpman_new ("example_dpman", GST_ELEMENT(example));

    ...
  }
  </PRE
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="chapter-dparams.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="section-dparam-define.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Supporting Dynamic Parameters</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="chapter-dparams.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Defining Parameter Specificiations</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>