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152 lines
3.3 KiB
Plaintext
152 lines
3.3 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GstAutoplug
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<!-- ##### SECTION Short_Description ##### -->
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Automatically create and link elements
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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GstAutoplug is an abstract class that is used for constructing and
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linking elements. Two types of autopluggers exist: renderer ones and non
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renderer ones. The renderer autopluggers will not have any src pads while the
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non renderer ones do.
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</para>
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<para>
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You first need to create a suitable autoplugger with gst_autoplug_factory_make()
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(see #GstAutoplugFactory).
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The name of the autoplugger must be one of the registered autopluggers
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(see #GstStaticAutoplug and #GstStaticAutoplugRender).
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</para>
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<para>
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If the autoplugger supports the RENDERER API, use gst_autoplug_to_renderers() to
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create a bin that links the src caps to the specified renderer elements. You can
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then add the bin to a pipeline and run it.
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<programlisting>
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GstAutoplug *autoplug;
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GstElement *element;
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GstElement *sink;
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/* create a static autoplugger */
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autoplug = gst_autoplug_factory_make ("staticrender");
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/* create an osssink */
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sink = gst_element_factory_make ("osssink", "our_sink");
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/* create an element that can play audio/mp3 through osssink */
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element = gst_autoplug_to_renderers (autoplug,
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gst_caps_new (
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"sink_audio_caps",
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"audio/mp3",
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NULL
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),
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sink,
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NULL);
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/* add the element to a bin and link the sink pad */
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...
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</programlisting>
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</para>
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<para>
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If the autoplugger supports the CAPS API, use gst_autoplug_to_caps() to
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link the src caps to the destination caps. The created bin will have src caps
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compatible with the provided sink caps.
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<programlisting>
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GstAutoplug *autoplug;
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GstElement *element;
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/* create a static autoplugger */
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autoplug = gst_autoplug_factory_make ("static");
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/* create an element that converts audio/mp3 to audio/raw */
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element = gst_autoplug_to_caps (autoplug,
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gst_caps_new (
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"sink_audio_caps",
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"audio/mp3",
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NULL
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),
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gst_caps_new (
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"src_audio_caps",
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"audio/raw",
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NULL
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),
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NULL);
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/* add the element to a bin and link the src/sink pads */
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...
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</programlisting>
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</para>
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<para>
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Optionally you can get a notification when a new object is added to the created
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pipeline with a g_signal_connect to the "new_object" signal.
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</para>
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<para>
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Use the regular gst_object_destroy() call to destroy the autoplugger.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GstStaticAutoplug, #GstStaticAutoplugRender
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</para>
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<!-- ##### STRUCT GstAutoplug ##### -->
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<para>
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The autoplug object
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</para>
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<!-- ##### SIGNAL GstAutoplug::new-object ##### -->
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<para>
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</para>
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@gstautoplug: the object which received the signal.
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@arg1:
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<!-- ##### ENUM GstAutoplugFlags ##### -->
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<para>
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The type of the autoplugger.
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</para>
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@GST_AUTOPLUG_TO_CAPS:
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@GST_AUTOPLUG_TO_RENDERER:
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@GST_AUTOPLUG_FLAG_LAST:
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<!-- ##### FUNCTION gst_autoplug_signal_new_object ##### -->
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<para>
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</para>
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@autoplug:
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@object:
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<!-- ##### FUNCTION gst_autoplug_to_caps ##### -->
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<para>
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</para>
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@autoplug:
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@srccaps:
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@sinkcaps:
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@Varargs:
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@Returns:
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<!-- ##### FUNCTION gst_autoplug_to_renderers ##### -->
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<para>
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</para>
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@autoplug:
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@srccaps:
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@target:
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@Varargs:
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@Returns:
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