GstPad Object contained by elements that allows links to other elements A #GstElement is linked to other elements via "pads", which are extremely light-weight generic link points. After two pads are retrieved from an element with gst_element_get_pad(), the pads can be link with gst_pad_link(). (For quick links, you can also use gst_element_link(), which will make the obvious link for you if it's straightforward.) Pads are typically created from a #GstPadTemplate with gst_pad_new_from_template(). Pads have #GstCaps attached to it to describe the media type they are capable of dealing with. gst_pad_get_caps() and gst_pad_try_set_caps() are used to manipulate the caps of the pads. Pads created from a pad template cannot set capabilities that are incompatible with the pad template capabilities. Pads without pad templates can be created with gst_pad_new(), which takes a direction and a name as an argument. If the name is NULL, then a guaranteed unique name will be assigned to it. gst_pad_get_parent() will retrieve the #GstElement that owns the pad. A #GstElement creating a pad will typically use the various gst_pad_set_*_function() calls to register callbacks for various events on the pads. GstElements will use gst_pad_push() and gst_pad_pull() to push out or pull in a buffer. gst_pad_select() and gst_pad_selectv() are used by plugins to wait for the first incoming buffer or event on any of the given set of pads. To send a #GstEvent on a pad, use gst_pad_send_event(). Last reviewed on December 13th, 2002 (0.5.0.1) #GstPadTemplate, #GstElement, #GstEvent @parent_class: @caps_nego_failed: @linked: @unlinked: @appfixatefunc: @_gst_reserved: @parent_class: @_gst_reserved: @obj: @klass: @obj: @obj: @klass: @obj: @obj: @klass: @obj: @obj: @klass: @obj: @obj: @klass: @name_template: @direction: @presence: @static_caps: The result of a pad link. @GST_PAD_LINK_REFUSED: the link was refused. @GST_PAD_LINK_DELAYED: the link was delayed, probably because the element needs more specific pad capabilitiess. @GST_PAD_LINK_OK: the link succeeded. @GST_PAD_LINK_DONE: the link succeeded, any more attempts are not needed. @ret: @ret: A convenience macro to construct query type functions @functionname: the name of the function @...: query types, 0 to mark the last element Convenience function to define an array of formats that can be used as #GstPadGetFormatsFunction. @functionname: The name of the function @...: comma separated list of formats, 0 to mark the end Convenience function to define an array of event masks that can be used as #GstPadGetEventMaskFunction. @functionname: The name of the function @...: comma separated list of event maks, { 0, } to mark the end A function that will be called when chaining buffers. @pad: the #GstPad that performed the chain. @data: @buf: the #GstBuffer that is chained. A function that will be called when pulling a buffer. @pad: the #GstPad to get a buffer from. @Returns: the #GstBuffer pulled. Function signature to handle an event for the pad. @pad: the #GstPad to handle the event. @event: the #GstEvent to handle. @Returns: TRUE if the pad could handle the event. The signature of a convert function. @pad: the #GstPad to perform the convert on. @src_format: the source #GstFormat of the conversion. @src_value: the source value of the conversion. @dest_format: a pointer to the destination #GstFormat. @dest_value: a pointer to the destination value. @Returns: TRUE if the conversion could be performed. The signature of the query function. @pad: the #GstPad to query. @type: the #GstPadQueryType. @format: a pointer to the target #GstFormat. @value: a pointer to the target value. @Returns: TRUE if the query could be performed. The signature of the internal pad link function. @pad: The #GstPad to query. @Returns: a newly allocated #GList of pads that are linked to the given pad on the inside of the parent element. The caller must call g_list_free() on it after use. The signature of the formats function. @pad: a #GstPad to query @Returns: an array of formats The signature of the eventmask function. @pad: the #GstPad to query @Returns: an array of event masks The signature of the query types function. @pad: a #GstPad to query @Returns: an array of query types Function signature to handle a new link on the pad. @pad: the #GstPad that is linked. @caps: the peer's #GstCaps. @Returns: the result of the link with the specified caps. @pad: Returns the capabilities of the specified pad. By default this function will return the pad template capabilities, but can optionally be overridden. @pad: the #GstPad to get the capabilities of. @Returns: the #GstCaps of the pad. @caps: the peer's #GstCaps, can be used to filter the capabilities. @pad: @caps: @Returns: @pad: @offset: @size: @Returns: A dispatcher function is called for all internally linked pads, see gst_pad_dispatcher(). @pad: the #GstPad that is dispatched. @data: the gpointer to optional user data. @Returns: TRUE if the dispatching procedure has to be stopped. The direction of a pad. @GST_PAD_UNKNOWN: direction is unknown. @GST_PAD_SRC: the pad is a source pad. @GST_PAD_SINK: the pad is a sink pad. Flags for the pad. @GST_PAD_DISABLED: the pad is disabled. @GST_PAD_NEGOTIATING: @GST_PAD_FLAG_LAST: subclasses can use this number to enumerate their flags. Gets the name of the pad. @pad: a #GstPad to get the name of. @Returns: the pad's name. Gets the parent element of this pad. @pad: a #GstPad to get the parent of. @Returns: the parent #GstElement of this pad. Gets the private data set by the element that owns the pad. @pad: a #GstPad to get the private data of. #Returns: a gpointer to the private data. Gets the pad template that was used to create this pad. @pad: a #GstPad to get the pad template of. #Returns: the #GstPadTemplate used to create the pad, or NULL if none was used. Get the direction of the real pad. @pad: the realpad to query. Get the caps of the real pad. @pad: the real pad to query. Get the application filter for this pad @pad: the pad to query Get the peer element of the real pad. @pad: the real pad to query. Get the chain function of the real pad. @pad: the real pad to query. Get the eventhandler function from the real pad. @pad: the real pad to query. Get get getfunction of the real pad. @pad: the real pad to query. Get the gethandler function of this real pad. @pad: the real pad to query. Get the event function of this real pad. @pad: the real pad to query. Get the eventhandler function of this real pad. @pad: the real pad to query. Get the convert function of this pad @pad: the pad to query Get the query function of this pad @pad: the pad to query Get the internal link function of this pad @pad: the pad to query Get the formats function of this pad @pad: the pad to query Get the query types function of this pad @pad: the pad to query Get the event mask function of this pad @pad: the pad to query Get the link function of the pad @pad: the pad to query @pad: Get the getcaps function of this pad @pad: the pad to query @pad: @pad: @pad: @pad: Get the real pad of this ghost pad. @pad: the real pad to query. Returns the real pad of this pad. @pad: a #GstPad to realize. @Returns: the actual #GstPad. Gets the pad's direction. @pad: a #GstPad to get the direction of. @Returns: the #GstPadDirection of the pad. Gets the capabilities of a pad. @pad: a #GstPad to get the capabilities of. @Returns: the #GstCaps of the pad. Gets the peer pad of this pad. The peer pad is the pad on to which the parent element is linked through this pad. @pad: a #GstPad to get the peer pad of. @Returns: the peer #GstPad. Checks if the pad is linked. @pad: a #GstPad to check. Checks if the pad is active. @pad: a #GstPad to check @pad: Checks if a pad is usable. A usable pad is both linked and active. @pad: a #GstPad to check Checks if buffers can be pulled from this buffer. @pad: a #GstPad to check on if a buffer can be pulled from it. Checks if the pad is a source pad. @pad: a #GstPad to check. Checks if the pad is a sink pad. @pad: a #GstPad to check. @obj: @klass: @obj: @klass: @obj: Indicates when this pad will become available. @GST_PAD_ALWAYS: the pad is always available @GST_PAD_SOMETIMES: the pad will become available depending on the media stream @GST_PAD_REQUEST: th pad is only available on request with gst_element_request_pad_by_name() or gst_element_request_compatible_pad(). Get the nametemplate of the padtemplate. @templ: the template to query Get the direction of the padtemplate. @templ: the template to query Get the presence of the padtemplate. @templ: the template to query Get a handle to the padtemplate #GstCaps @templ: the template to query Flags for the padtemplate @GST_PAD_TEMPLATE_FIXED: The padtemplate has no variable properties @GST_PAD_TEMPLATE_FLAG_LAST: first flag that can be used by subclasses. Check if the properties of the padtemplate are fixed @templ: the template to query @padname: @dir: @pres: @caps: @Returns: @Returns: @name: @direction: @Returns: @templ: @name: @Returns: @type: @name: @direction: @Returns: @type: @templ: @name: @Returns: @pad: @name: @pad: @Returns: @pad: @Returns: @pad: @active: @pad: @Returns: @pad: @priv: @pad: @Returns: @pad: @parent: @pad: @Returns: @pad: @Returns: @pad: @Returns: @pad: @ghostpad: @pad: @ghostpad: @pad: @Returns: @pad: @Returns: @pad: @bufalloc: @bufferalloc: @pad: @offset: @size: @Returns: @pad: @chain: @pad: @get: @pad: @event: @pad: @mask_func: @pad: @Returns: @pad: @Returns: @pad: @link: @srcpad: @sinkpad: @Returns: @srcpad: @sinkpad: @filtercaps: @Returns: @pad: @unlink: @srcpad: @sinkpad: @Returns: @srcpad: @sinkpad: @filtercaps: @Returns: @srcpad: @sinkpad: @pad: @Returns: @pad: @Returns: @pad: @Returns: @pad: @Returns: @pad: @Returns: @pad: @Returns: @pad: @caps: @Returns: @pad: @caps: @Returns: @srcpad: @sinkpad: @Returns: @pad: @getcaps: @pad: @fixate: @pad: @Returns: @pad: @caps: @Returns: @pad: @caps: @Returns: @pad: @caps: @Returns: @pad: @caps: @Returns: @pad: @srcpad: @sinkpad: @filtercaps: @Returns: @srcpad: @sinkpad: @Returns: @pad: @Returns: @pad: @srcpad: @sinkpad: @filtercaps: @Returns: @pad: @Returns: @pad: @pad: @allowed: @Returns: @pad: @data: @buf: @pad: @Returns: @pad: @event: @Returns: @pad: @event: @Returns: @pad: @Varargs: @Returns: @padlist: @padlist: @Returns: @pad: @Varargs: @pad: @varargs: @Returns: @selected: @pad: @Varargs: @Returns: @selected: @padlist: @Returns: @selected: @pad: @varargs: @Returns: @pad: @formats: @pad: @Returns: @pad: @Returns: @pad: @convert: @pad: @src_format: @src_value: @dest_format: @dest_value: @Returns: @pad: @src_format: @src_value: @dest_format: @dest_value: @Returns: @pad: @query: @pad: @type_func: @pad: @Returns: @pad: @Returns: @pad: @type: @format: @value: @Returns: @pad: @type: @format: @value: @Returns: @pad: @intlink: @pad: @Returns: @pad: @Returns: @pad: @dispatch: @data: @Returns: Adds the probe to the given pad @pad: The pad to add the probe to @probe: The probe to add to the pad Remove the probe from the pad @pad: The pad to remove the probe of @probe: The probe to remove @self: @parent: @name: @pad: @Returns: @Returns: @name_template: @direction: @presence: @caps: @Returns: @Varargs: @pad_template: @Returns: @templ: @templ: @Returns: @templ: @name: @Returns: @pad: @parent: @Returns: