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b214d35eed
Original commit message from CVS: commit to make gstreamer follow the gtk function/macro naming conventions: GstPadTemplate <-> gst_pad_template <-> GST_PAD_TEMPLATE and the same for *factory and typefind.
108 lines
2.4 KiB
Plaintext
108 lines
2.4 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GstTypeFactory
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<!-- ##### SECTION Short_Description ##### -->
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Add types to plugins.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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A GstTypeFactory is used to add a new type and a typedetection function
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to a plugin. Typefactories are named so they can be found with
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gst_type_factory_find().
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</para>
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<para>
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gst_type_factory_new() is used to create a new typefactory from the given
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#GstTypeDefinition. A typefactory is added to a #GstPlugin with
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gst_plugin_add_feature() as shown in the example:
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<programlisting>
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static GstCaps*
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avi_type_find (GstBuffer *buf, gpointer private)
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{
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gchar *data = GST_BUFFER_DATA (buf);
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if (strncmp (&data[0], "RIFF", 4)) return NULL;
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if (strncmp (&data[8], "AVI ", 4)) return NULL;
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return gst_caps_new ("avi_type_find","video/avi", NULL);
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}
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/* typedefinition for 'avi' */
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static GstTypeDefinition avidefinition = {
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"avidecoder_video/avi", /* the name of this definition */
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"video/avi", /* the mime type */
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".avi", /* the file extensions */
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avi_type_find, /* a pointer to a GstTypeFindFunc function */
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};
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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GstTypeFactory *type;
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...
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type = gst_type_factory_new (&avidefinition);
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (type));
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...
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}
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</programlisting>
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GstPluginFeature, #GstPlugin
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</para>
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<!-- ##### STRUCT GstTypeFactory ##### -->
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<para>
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The struct with the typefactory information.
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</para>
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<!-- ##### STRUCT GstTypeDefinition ##### -->
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<para>
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</para>
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@name: The name of this factory
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@mime: The mime type of the new type.
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@exts: The extensions of this type.
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@typefindfunc: An optional typefind function.
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<!-- ##### USER_FUNCTION GstTypeFindFunc ##### -->
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<para>
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This is the function that will be called when a typefind has to be
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performed by a plugin.
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</para>
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@buf: the buffer with media on which to perform the typefind
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@priv: private; don't touch
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@Returns: A #GstCaps structure describing the type or NULL if the
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type was not recognized by this function;
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<!-- ##### FUNCTION gst_type_factory_new ##### -->
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<para>
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</para>
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@definition:
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@Returns:
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<!-- ##### FUNCTION gst_type_factory_find ##### -->
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<para>
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</para>
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@name:
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@Returns:
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<!-- ##### FUNCTION gst_type_factory_get_list ##### -->
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<para>
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</para>
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@Returns:
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