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4b908e33e0
Original commit message from CVS: 2005-06-08 Andy Wingo <wingo@pobox.com> * gst/gstutils.c: RPAD fixes all around. (gst_element_link_pads): Refcounting fixes. * tools/gst-inspect.c: * tools/gst-xmlinspect.c: * parse/grammar.y: * gst/base/gsttypefindhelper.c: * gst/base/gstbasesink.c: * gst/gstqueue.c: RPAD fixes. * gst/gstghostpad.h: * gst/gstghostpad.c: New ghost pad implementation as full proxy pads. The tricky thing is they provide both source and sink interfaces, since they proxy the internal pad for the external pad, and vice versa. Implement with lower-level ProxyPad objects, with the interior proxy pad as a child of the exterior ghost pad. Should write a doc on this. * gst/gstpad.h: s/RPAD/PAD/, s/RealPad/Pad/. (gst_pad_set_name, gst_pad_set_parent): Macros removed, use gst_object API. * gst/gstpad.c: Big changes. No more stub base GstPad, now all pads are real pads. No ghost pads in this file. Not documenting the myriad s/RPAD/PAD/ and REALIZE fixes. (gst_pad_class_init): Add properties for "direction" and "template". Both are construct-only, so they can't change during the life of the pad. Fixes properly deriving from GstPad. (gst_pad_custom_new, gst_pad_custom_new_from_template): Gone. For derived objects, just set properties when creating the objects via g_object_new. (gst_pad_get_parent): Implement as a function, return NULL if the parent is not an element. (gst_pad_get_real_parent, gst_pad_add_ghost_pad) (gst_pad_remove_ghost_pad, gst_pad_realize): Removed. * gst/gstobject.c (gst_object_class_init): Make name a construct property. Don't set it in the object init. * gst/gstelement.c (gst_element_add_pad): Don't allow adding pads with UNKNOWN direction. (gst_element_add_ghost_pad): Remove non-orthogonal API. Replace with gst_element_add_pad (e, gst_ghost_pad_new (name, pad)). (gst_element_remove_pad): Remove ghost-pad special cases. (gst_element_pads_activate): Remove rpad cruft. * gst/gstbin.c (gst_bin_change_state): Use gst_pad_get_parent to catch the pad's-parent-not-an-element case. * gst/gst.h: Include gstghostpad.h. * gst/gst.c (init_post): No more real, ghost pads. * gst/Makefile.am: Add gstghostpad.[ch]. * check/Makefile.am: * check/gst/gstbin.c: * check/gst/gstghostpad.c (test_ghost_pads): Check that linking into a bin creates ghost pads, and that the refcounts are right. Partly moved from gstbin.c.
823 lines
13 KiB
Text
823 lines
13 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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@linkfunc:
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@unlinkfunc:
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@peer:
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@sched_private:
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@loopfunc:
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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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@probedisp:
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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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@mode:
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@Returns:
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<!-- # Unused Parameters # -->
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@active:
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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:
|
|
@unlink:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_link ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@srcpad:
|
|
@sinkpad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_unlink ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@srcpad:
|
|
@sinkpad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_is_linked ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_peer ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_negotiated_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_pad_template_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_set_getcaps_function ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@getcaps:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_proxy_getcaps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_allowed_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@srcpad:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@pad:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_push ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@buffer:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@data:
|
|
@buf:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_send_event ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@event:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_event_default ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@event:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_set_query_function ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@query:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_set_query_type_function ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@type_func:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_query_types ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### 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:
|
|
|
|
|
|
<!-- ##### MACRO gst_pad_add_probe ##### -->
|
|
<para>
|
|
Adds the probe to the given pad
|
|
</para>
|
|
|
|
@pad: The pad to add the probe to
|
|
@probe: The probe to add to the pad
|
|
|
|
|
|
<!-- ##### MACRO gst_pad_remove_probe ##### -->
|
|
<para>
|
|
Remove the probe from the pad
|
|
</para>
|
|
|
|
@pad: The pad to remove the probe of
|
|
@probe: The probe to remove
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_load_and_link ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@self:
|
|
@parent:
|
|
|
|
|