Sophie: lib64gstreamer0.10-devel-0.10.36-7.mga4 x86

lib64gstreamer0.10-devel-0.10.36-7.mga4.x86_64.rpm

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>Chapter 21. Things to check when writing an application</H1
><P
>&#13;    This chapter contains a fairly random selection of things that can be
    useful to keep in mind when writing <SPAN
CLASS="application"
>GStreamer</SPAN
>-based applications. It's
    up to you how much you're going to use the information provided here.
    We will shortly discuss how to debug pipeline problems using <SPAN
CLASS="application"
>GStreamer</SPAN
>
    applications. Also, we will touch upon how to acquire knowledge about
    plugins and elements and how to test simple pipelines before building
    applications around them.
  </P
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>21.1. Good programming habits</A
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>&#13;          Always add a <CODE
CLASS="classname"
>GstBus</CODE
> handler to your
          pipeline. Always report errors in your application, and try
          to do something with warnings and information messages, too.
        </P
></LI
><LI
><P
>&#13;          Always check return values of <SPAN
CLASS="application"
>GStreamer</SPAN
> functions. Especially,
          check return values of <CODE
CLASS="function"
>gst_element_link ()</CODE
>
          and <CODE
CLASS="function"
>gst_element_set_state ()</CODE
>.
        </P
></LI
><LI
><P
>&#13;          Dereference return values of all functions returning a non-base
          type, such as <CODE
CLASS="function"
>gst_element_get_pad ()</CODE
>. Also,
          always free non-const string returns, such as
          <CODE
CLASS="function"
>gst_object_get_name ()</CODE
>.
        </P
></LI
><LI
><P
>&#13;          Always use your pipeline object to keep track of the current state
          of your pipeline. Don't keep private variables in your application.
          Also, don't update your user interface if a user presses the
          <SPAN
CLASS="QUOTE"
>"play"</SPAN
> button. Instead, listen for the
          <SPAN
CLASS="QUOTE"
>"state-changed"</SPAN
> message on the
          <CODE
CLASS="classname"
>GstBus</CODE
> and only update the user interface
          whenever this message is received.
        </P
></LI
><LI
><P
>&#13;          Report all bugs that you find in <SPAN
CLASS="application"
>GStreamer</SPAN
> bugzilla at
          <A
HREF="http://bugzilla.gnome.org"
TARGET="_top"
>http://bugzilla.gnome.org/</A
>.
        </P
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