mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-26 18:20:44 +00:00
83a7075f8a
Original commit message from CVS: 2005-07-05 Andy Wingo <wingo@pobox.com> * check/gst/gstbus.c (pound_bus_with_messages): * check/gst/gstmessage.c (START_TEST): * check/pipelines/simple_launch_lines.c (got_handoff): Application message API change. * gst/base/gstbasetransform.c (gst_base_transform_setcaps): More logic weaks here: always run transform_caps, trying passthrough operation only if the original caps intersects with the transform. * gst/gstpad.c (gst_pad_link_check_compatible_unlocked): Debug source and sink caps. * gst/base/gstbasetransform.c (gst_base_transform_getcaps): Intersect the peer caps with the pad template before going into transform_caps. (gst_base_transform_transform_caps): More debugging. * gst/gstmessage.h (gst_message_new_application): Take a GstObject src argument.
879 lines
14 KiB
Text
879 lines
14 KiB
Text
<!-- ##### SECTION Title ##### -->
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GstPad
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<!-- ##### SECTION Short_Description ##### -->
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Object contained by elements that allows links to other elements
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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A #GstElement is linked to other elements via "pads", which are extremely
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light-weight generic link points.
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After two pads are retrieved from an element with gst_element_get_pad(),
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the pads can be link with gst_pad_link(). (For quick links,
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you can also use gst_element_link(), which will make the obvious
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link for you if it's straightforward.)
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</para>
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<para>
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Pads are typically created from a #GstPadTemplate with
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gst_pad_new_from_template().
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</para>
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<para>
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Pads have #GstCaps attached to it to describe the media type they
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are capable of dealing with.
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gst_pad_get_caps() and gst_pad_try_set_caps() are used to
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manipulate the caps of the pads.
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Pads created from a pad template cannot set capabilities that are
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incompatible with the pad template capabilities.
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</para>
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<para>
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Pads without pad templates can be created with gst_pad_new(),
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which takes a direction and a name as an argument. If the name is NULL,
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then a guaranteed unique name will be assigned to it.
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</para>
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<para>
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gst_pad_get_parent() will retrieve the #GstElement that owns the pad.
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</para>
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<para>
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A #GstElement creating a pad will typically use the various
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gst_pad_set_*_function() calls to register callbacks for various events
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on the pads.
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</para>
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<para>
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GstElements will use gst_pad_push() and gst_pad_pull() to push out
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or pull in a buffer.
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gst_pad_select() and gst_pad_selectv() are used by plugins to wait for the
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first incoming buffer or event on any of the given set of pads.
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</para>
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<para>
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To send a #GstEvent on a pad, use gst_pad_send_event().
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</para>
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<para>
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Last reviewed on December 13th, 2002 (0.5.0.1)
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GstPadTemplate, #GstElement, #GstEvent
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</para>
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<!-- ##### STRUCT GstPad ##### -->
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<para>
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</para>
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@stream_rec_lock:
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@task:
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@preroll_lock:
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@preroll_cond:
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@block_cond:
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@block_callback:
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@block_data:
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@caps:
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@getcapsfunc:
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@setcapsfunc:
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@acceptcapsfunc:
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@fixatecapsfunc:
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@activatefunc:
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@activatepushfunc:
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@activatepullfunc:
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@linkfunc:
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@unlinkfunc:
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@peer:
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@sched_private:
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@chainfunc:
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@checkgetrangefunc:
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@getrangefunc:
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@eventfunc:
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@mode:
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@querytypefunc:
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@queryfunc:
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@intlinkfunc:
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@bufferallocfunc:
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@do_buffer_signals:
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@do_event_signals:
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<!-- ##### SIGNAL GstPad::have-data ##### -->
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<para>
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</para>
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@gstpad: the object which received the signal.
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@arg1:
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@Returns:
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<!-- ##### SIGNAL GstPad::linked ##### -->
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<para>
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</para>
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@gstpad: the object which received the signal.
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@arg1:
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<!-- ##### SIGNAL GstPad::request-link ##### -->
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<para>
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</para>
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@gstpad: the object which received the signal.
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<!-- ##### SIGNAL GstPad::unlinked ##### -->
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<para>
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</para>
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@gstpad: the object which received the signal.
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@arg1:
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<!-- ##### ARG GstPad:caps ##### -->
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<para>
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</para>
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<!-- ##### ARG GstPad:direction ##### -->
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<para>
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</para>
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<!-- ##### ARG GstPad:template ##### -->
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<para>
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</para>
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<!-- ##### MACRO GST_PAD_LINK_FAILED ##### -->
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<para>
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Macro to test if the given #GstPadLinkReturn value indicates a
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failed negotiation step (REFUSED/DELAYED).
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</para>
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@ret: the #GstPadLinkReturn value
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<!-- ##### MACRO GST_PAD_LINK_SUCCESSFUL ##### -->
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<para>
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Macro to test if the given #GstPadLinkReturn value indicates a
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successfull negotiation step (OK/DONE).
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</para>
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@ret: the #GstPadLinkReturn value
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<!-- ##### USER_FUNCTION GstPadChainFunction ##### -->
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<para>
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A function that will be called when chaining buffers.
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</para>
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@pad: the #GstPad that performed the chain.
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@buffer:
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@Returns:
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<!-- # Unused Parameters # -->
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@data:
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@buf: the #GstBuffer that is chained.
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<!-- ##### USER_FUNCTION GstPadEventFunction ##### -->
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<para>
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Function signature to handle an event for the pad.
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</para>
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@pad: the #GstPad to handle the event.
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@event: the #GstEvent to handle.
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@Returns: TRUE if the pad could handle the event.
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<!-- ##### USER_FUNCTION GstPadQueryFunction ##### -->
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<para>
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The signature of the query function.
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</para>
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@pad: the #GstPad to query.
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@query:
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@Returns: TRUE if the query could be performed.
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<!-- # Unused Parameters # -->
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@type: the #GstPadQueryType.
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@format: a pointer to the target #GstFormat.
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@value: a pointer to the target value.
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<!-- ##### USER_FUNCTION GstPadIntLinkFunction ##### -->
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<para>
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The signature of the internal pad link function.
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</para>
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@pad: The #GstPad to query.
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@Returns: a newly allocated #GList of pads that are linked to
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the given pad on the inside of the parent element.
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The caller must call g_list_free() on it after use.
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<!-- ##### USER_FUNCTION GstPadQueryTypeFunction ##### -->
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<para>
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The signature of the query types function.
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</para>
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@pad: a #GstPad to query
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@Returns: an array of query types
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<!-- ##### USER_FUNCTION GstPadLinkFunction ##### -->
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<para>
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Function signature to handle a new link on the pad.
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</para>
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@pad: the #GstPad that is linked.
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@peer:
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@Returns: the result of the link with the specified caps.
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<!-- # Unused Parameters # -->
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@caps: the peer's #GstCaps.
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<!-- ##### USER_FUNCTION GstPadUnlinkFunction ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### USER_FUNCTION GstPadGetCapsFunction ##### -->
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<para>
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Returns a copy of the capabilities of the specified pad. By default this
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function will return the pad template capabilities, but can optionally
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be overridden.
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</para>
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@pad: the #GstPad to get the capabilities of.
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@Returns: a newly allocated copy #GstCaps of the pad.
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<!-- # Unused Parameters # -->
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@caps: the peer's #GstCaps, can be used to filter the capabilities.
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<!-- ##### USER_FUNCTION GstPadBufferAllocFunction ##### -->
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<para>
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</para>
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@pad:
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@offset:
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@size:
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@caps:
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@buf:
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@Returns:
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<!-- ##### USER_FUNCTION GstPadDispatcherFunction ##### -->
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<para>
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A dispatcher function is called for all internally linked pads, see
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gst_pad_dispatcher().
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</para>
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@pad: the #GstPad that is dispatched.
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@data: the gpointer to optional user data.
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@Returns: TRUE if the dispatching procedure has to be stopped.
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<!-- ##### ENUM GstPadDirection ##### -->
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<para>
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The direction of a pad.
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</para>
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@GST_PAD_UNKNOWN: direction is unknown.
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@GST_PAD_SRC: the pad is a source pad.
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@GST_PAD_SINK: the pad is a sink pad.
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<!-- ##### ENUM GstPadFlags ##### -->
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<para>
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</para>
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@GST_PAD_BLOCKED:
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@GST_PAD_FLUSHING:
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@GST_PAD_IN_GETCAPS:
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@GST_PAD_IN_SETCAPS:
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@GST_PAD_FLAG_LAST:
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<!-- ##### ENUM GstPadLinkReturn ##### -->
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<para>
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The result of a pad link.
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</para>
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@GST_PAD_LINK_NOSCHED:
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@GST_PAD_LINK_NOFORMAT:
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@GST_PAD_LINK_REFUSED: the link was refused.
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@GST_PAD_LINK_WRONG_DIRECTION:
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@GST_PAD_LINK_WAS_LINKED:
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@GST_PAD_LINK_OK: the link succeeded.
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<!-- ##### ENUM GstPadPresence ##### -->
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<para>
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Indicates when this pad will become available.
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</para>
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@GST_PAD_ALWAYS: the pad is always available
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@GST_PAD_SOMETIMES: the pad will become available depending on the media stream
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@GST_PAD_REQUEST: the pad is only available on request with
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gst_element_request_pad_by_name() or gst_element_request_compatible_pad().
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<!-- ##### MACRO GST_PAD_NAME ##### -->
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<para>
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Gets the name of the pad.
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</para>
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@pad: a #GstPad to get the name of.
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@Returns: the pad's name.
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<!-- ##### MACRO GST_PAD_PARENT ##### -->
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<para>
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Gets the parent element of this pad.
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</para>
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@pad: a #GstPad to get the parent of.
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@Returns: the parent #GstElement of this pad.
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<!-- ##### MACRO GST_PAD_ELEMENT_PRIVATE ##### -->
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<para>
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Gets the private data set by the element that owns the pad.
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</para>
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@pad: a #GstPad to get the private data of.
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#Returns: a gpointer to the private data.
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<!-- ##### MACRO GST_PAD_PAD_TEMPLATE ##### -->
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<para>
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Gets the pad template that was used to create this pad.
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</para>
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@pad: a #GstPad to get the pad template of.
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#Returns: the #GstPadTemplate used to create the pad, or NULL if none was
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used.
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<!-- ##### MACRO GST_PAD_DIRECTION ##### -->
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<para>
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Gets the pad's direction.
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</para>
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@pad: a #GstPad to get the direction of.
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@Returns: the #GstPadDirection of the pad.
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<!-- ##### MACRO GST_PAD_CAPS ##### -->
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<para>
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Gets the capabilities of a pad.
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</para>
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@pad: a #GstPad to get the capabilities of.
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@Returns: the #GstCaps of the pad.
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<!-- ##### MACRO GST_PAD_PEER ##### -->
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<para>
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Gets the peer pad of this pad. The peer pad is the pad on to which the parent
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element is linked through this pad.
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</para>
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@pad: a #GstPad to get the peer pad of.
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@Returns: the peer #GstPad.
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<!-- ##### MACRO GST_PAD_IS_LINKED ##### -->
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<para>
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Checks if the pad is linked.
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</para>
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@pad: a #GstPad to check.
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<!-- ##### MACRO GST_PAD_IS_USABLE ##### -->
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<para>
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Checks if a pad is usable. A usable pad is both linked and active.
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</para>
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@pad: a #GstPad to check
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<!-- ##### MACRO GST_PAD_IS_SRC ##### -->
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<para>
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Checks if the pad is a source pad.
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</para>
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@pad: a #GstPad to check.
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<!-- ##### MACRO GST_PAD_IS_SINK ##### -->
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<para>
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Checks if the pad is a sink pad.
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</para>
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@pad: a #GstPad to check.
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<!-- ##### FUNCTION gst_pad_new ##### -->
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<para>
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</para>
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@name:
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@direction:
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@Returns:
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<!-- ##### FUNCTION gst_pad_new_from_template ##### -->
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<para>
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</para>
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@templ:
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@name:
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@Returns:
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<!-- ##### MACRO gst_pad_get_name ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_direction ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_active ##### -->
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<para>
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</para>
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@pad:
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@active:
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@Returns:
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<!-- # Unused Parameters # -->
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@mode:
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<!-- ##### FUNCTION gst_pad_is_active ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_element_private ##### -->
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<para>
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</para>
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@pad:
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@priv:
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<!-- ##### FUNCTION gst_pad_get_element_private ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_parent ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_pad_template ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_bufferalloc_function ##### -->
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<para>
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</para>
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@pad:
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@bufalloc:
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<!-- # Unused Parameters # -->
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@bufferalloc:
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<!-- ##### FUNCTION gst_pad_alloc_buffer ##### -->
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<para>
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</para>
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@pad:
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@offset:
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@size:
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@caps:
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@buf:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_chain_function ##### -->
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<para>
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</para>
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@pad:
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@chain:
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<!-- ##### FUNCTION gst_pad_set_event_function ##### -->
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<para>
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</para>
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@pad:
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@event:
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<!-- ##### FUNCTION gst_pad_set_link_function ##### -->
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<para>
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</para>
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@pad:
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@link:
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<!-- ##### FUNCTION gst_pad_can_link ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_unlink_function ##### -->
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<para>
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</para>
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@pad:
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@unlink:
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<!-- ##### FUNCTION gst_pad_link ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_unlink ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_is_linked ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_peer ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_negotiated_caps ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_caps ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_pad_template_caps ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_getcaps_function ##### -->
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<para>
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</para>
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@pad:
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@getcaps:
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<!-- ##### FUNCTION gst_pad_proxy_getcaps ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_allowed_caps ##### -->
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<para>
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</para>
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@srcpad:
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@Returns:
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<!-- # Unused Parameters # -->
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@pad:
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<!-- ##### FUNCTION gst_pad_push ##### -->
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<para>
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</para>
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@pad:
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@buffer:
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@Returns:
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|
<!-- # Unused Parameters # -->
|
|
@data:
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@buf:
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<!-- ##### FUNCTION gst_pad_send_event ##### -->
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|
<para>
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</para>
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@pad:
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@event:
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|
@Returns:
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<!-- ##### FUNCTION gst_pad_event_default ##### -->
|
|
<para>
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|
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</para>
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|
|
@pad:
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@event:
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|
@Returns:
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<!-- ##### FUNCTION gst_pad_set_query_function ##### -->
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<para>
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</para>
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|
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@pad:
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|
@query:
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<!-- ##### FUNCTION gst_pad_set_query_type_function ##### -->
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|
<para>
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</para>
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|
|
@pad:
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|
@type_func:
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|
|
<!-- ##### FUNCTION gst_pad_get_query_types ##### -->
|
|
<para>
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|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
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|
|
<!-- ##### FUNCTION gst_pad_get_query_types_default ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_query ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@query:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@type:
|
|
@format:
|
|
@value:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_query_default ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@query:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@type:
|
|
@format:
|
|
@value:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_set_internal_link_function ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@intlink:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_internal_links ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_internal_links_default ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_dispatcher ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@dispatch:
|
|
@data:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_load_and_link ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@self:
|
|
@parent:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_add_data_probe ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@handler:
|
|
@data:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_add_buffer_probe ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@handler:
|
|
@data:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_add_event_probe ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@handler:
|
|
@data:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_remove_data_probe ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@handler:
|
|
@data:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_remove_buffer_probe ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@handler:
|
|
@data:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_remove_event_probe ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@handler:
|
|
@data:
|
|
|
|
|