mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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0bb01afa84
Original commit message from CVS: Split out the padtemplate, autoplugfactoy and elementfactory into different pages to be able to show more examples and the object hierarchy.
887 lines
13 KiB
Text
887 lines
13 KiB
Text
<!-- ##### SECTION Title ##### -->
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GstPad
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<!-- ##### SECTION Short_Description ##### -->
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The connection between Elements
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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#GstElement are connected to each other via "pads", which are extremely light-weight generic
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connections. After two pad are retrieved from an element with gst_element_get_pad(), the pads
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can be connected with gst_pad_connect().
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</para>
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<para>
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Pads are typically created from a #GstPadTemplate with gst_pad_new_from_template().
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</para>
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<para>
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Pad have #GstCaps attached to it to describe the media type they
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are capable of dealing with. gst_pad_get_caps() and gst_pad_set_caps() are used to
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manipulate the caps of the pads.
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Pads created from a padtemplate cannot set capabilities that are incompatible with
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the padtemplates capabilities.
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</para>
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<para>
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Pads without padtemplates can be created with gst_pad_new() which takes a direction and
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a name as an argument.
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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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GstElements creating a pad will typicilally use the various gst_pad_set_*_function() calls
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to register callbacks for various events 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 or pull a buffer in. The
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gst_pad_pullregion() function can be used to request for a buffer with a specific offset (in
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time or in bytes). gst_pad_select() and gst_pad_selectv() are use by plugins to wait on a set
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of pads for a new #GstBuffer or #GstEvent.
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</para>
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<para>
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To send an event on a pad, use gst_pad_send_event().
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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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<!-- ##### MACRO GST_PAD_NAME ##### -->
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<para>
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Get the name of the pad.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_ELEMENT_PRIVATE ##### -->
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<para>
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Get the private data set by the element that owns the pad.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_PARENT ##### -->
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<para>
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Get the parent element of this pad.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_PADTEMPLATE ##### -->
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<para>
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Get the padtemplate that was used to create this pad. NULL if no padtemplate
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was used.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_REALIZE ##### -->
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<para>
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Return the real pad of this pad.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_DIRECTION ##### -->
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<para>
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Get the pad direction.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_CAPS ##### -->
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<para>
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Get the capabilities of a pad.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_PEER ##### -->
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<para>
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Get the peerpad of this pad.
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</para>
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@pad: the pad to query
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<!-- ##### MACRO GST_PAD_CONNECTED ##### -->
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<para>
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Is this pad connected.
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</para>
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@pad: the pad to check
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<!-- ##### MACRO GST_PAD_CAN_PULL ##### -->
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<para>
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Can this pad be used to pull a buffer.
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</para>
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@pad: the pad to check
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<!-- ##### STRUCT GstPad ##### -->
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<para>
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</para>
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<!-- ##### USER_FUNCTION GstPadChainFunction ##### -->
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<para>
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The function that will be called when chaining buffers.
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</para>
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@pad: the pad that performed the chain
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@buf: the buffer that is chained
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<!-- ##### USER_FUNCTION GstPadGetFunction ##### -->
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<para>
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The function that will be called when pulling a buffer.
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</para>
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@pad: the pad to get a buffer from
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@Returns: a #GstBuffer
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<!-- ##### USER_FUNCTION GstPadGetRegionFunction ##### -->
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<para>
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The function that will be called when pulling a region buffer.
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You can specify which buffer to get using an offset/length pair or
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a start/stop timecode pair.
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</para>
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@pad: the pad to get a buffer from
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@type: the type of region to get (time or offset based)
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@offset: the offset of the region to get
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@len: the length of the region to get
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@Returns: a #GstBuffer
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<!-- ##### USER_FUNCTION GstPadNewCapsFunction ##### -->
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<para>
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The function that will be called when the caps of the pad has
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changed.
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</para>
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@pad: The pad that has its caps changed
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@caps: the new caps of the pad
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<!-- ##### USER_FUNCTION GstPadBufferPoolFunction ##### -->
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<para>
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The function that will be called when a bufferpool is requested
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from this pad.
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</para>
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@pad: the pad with the bufferpool
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@Returns: the GstBufferPool associated with this pad.
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<!-- ##### ENUM GstPadNegotiateReturn ##### -->
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<para>
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The possible results from padnegotiation.
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</para>
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@GST_PAD_NEGOTIATE_FAIL: The pads could not agree about the media type.
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@GST_PAD_NEGOTIATE_AGREE: The pads agreed about the media type.
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@GST_PAD_NEGOTIATE_TRY: The pad did not agree and suggests another media type.
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<!-- ##### USER_FUNCTION GstPadNegotiateFunction ##### -->
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<para>
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The function that will be called when negotiating.
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</para>
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@pad: The pad that is being negotiated
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@caps: The current caps that are being negotiated
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@data: A generic gpointer that can be used to store user_data
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@Returns: The result of the negotiation process
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<!-- ##### ENUM GstRegionType ##### -->
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<para>
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the region types for #gst_pad_pullregion.
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</para>
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@GST_REGION_VOID:
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@GST_REGION_OFFSET_LEN: an offet/length pair
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@GST_REGION_TIME_LEN: a time start/length pair
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<!-- ##### USER_FUNCTION GstPadPullRegionFunction ##### -->
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<para>
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The function that will be called when pulling a region buffer.
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You can specify which buffer to get using an offset/length pair or
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a start/stop timecode pair.
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</para>
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@pad: the pad to get a buffer from
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@type: the type of region to get (time or offset based)
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@offset: the offset of the region to get
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@len: the length of the region to get
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@Returns: a #GstBuffer
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<!-- ##### USER_FUNCTION GstPadEventFunction ##### -->
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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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<!-- ##### ENUM GstPadDirection ##### -->
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<para>
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The direction this pad is.
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</para>
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@GST_PAD_UNKNOWN: direction is unknown
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@GST_PAD_SRC: this is a source pad
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@GST_PAD_SINK: this is a sink pad
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<!-- ##### ENUM GstPadFlags ##### -->
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<para>
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Flags for the pad.
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</para>
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@GST_PAD_DISABLED: the pad is disabled
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@GST_PAD_EOS: the pad is in end of stream state
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@GST_PAD_FLAG_LAST: subclasses can use this number to enumerate their flags
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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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<!-- ##### MACRO gst_pad_destroy ##### -->
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<para>
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Destroy the pad.
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</para>
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@pad: the pad to destroy
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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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<!-- # Unused Parameters # -->
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@temp:
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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_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_get_function ##### -->
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<para>
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</para>
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@pad:
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@get:
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<!-- ##### FUNCTION gst_pad_set_getregion_function ##### -->
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<para>
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</para>
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@pad:
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@getregion:
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<!-- ##### FUNCTION gst_pad_set_negotiate_function ##### -->
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<para>
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</para>
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@pad:
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@nego:
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<!-- ##### FUNCTION gst_pad_set_newcaps_function ##### -->
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<para>
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</para>
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@pad:
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@newcaps:
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<!-- ##### FUNCTION gst_pad_set_bufferpool_function ##### -->
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<para>
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</para>
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@pad:
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@bufpool:
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<!-- ##### FUNCTION gst_pad_set_caps ##### -->
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<para>
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</para>
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@pad:
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@caps:
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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_check_compatibility ##### -->
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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_name ##### -->
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<para>
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</para>
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@pad:
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@name:
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<!-- ##### FUNCTION 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_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_set_parent ##### -->
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<para>
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</para>
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@pad:
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@parent:
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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_sched ##### -->
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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_sched ##### -->
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<para>
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</para>
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@pad:
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@sched:
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<!-- ##### FUNCTION gst_pad_get_real_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_add_ghost_pad ##### -->
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<para>
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</para>
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@pad:
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@ghostpad:
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<!-- ##### FUNCTION gst_pad_remove_ghost_pad ##### -->
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<para>
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</para>
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@pad:
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@ghostpad:
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<!-- ##### FUNCTION gst_pad_get_ghost_pad_list ##### -->
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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_connect ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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<!-- # Unused Parameters # -->
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@Returns:
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<!-- ##### FUNCTION gst_pad_try_connect ##### -->
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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_disconnect ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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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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@buf:
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<!-- # Unused Parameters # -->
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@buffer:
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<!-- ##### FUNCTION gst_pad_pull ##### -->
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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_pullregion ##### -->
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<para>
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</para>
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@pad:
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@type:
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@offset:
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@len:
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@Returns:
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<!-- # Unused Parameters # -->
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@size:
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<!-- ##### FUNCTION gst_pad_get_bufferpool ##### -->
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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_load_and_connect ##### -->
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<para>
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</para>
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@self:
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@parent:
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<!-- # Unused Parameters # -->
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@element:
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@elements:
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<!-- ##### FUNCTION gst_pad_negotiate_proxy ##### -->
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<para>
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</para>
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@srcpad:
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@destpad:
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@caps:
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@Returns:
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<!-- # Unused Parameters # -->
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@counter:
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@count:
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<!-- ##### FUNCTION gst_pad_renegotiate ##### -->
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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_padtemplate ##### -->
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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_padtemplate_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_ghost_save_thyself ##### -->
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<para>
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</para>
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@pad:
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@bin:
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@parent:
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@Returns:
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<!-- ##### FUNCTION gst_pad_peek ##### -->
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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_select ##### -->
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<para>
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</para>
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@padlist:
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@Returns:
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<!-- ##### FUNCTION gst_pad_selectv ##### -->
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<para>
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</para>
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@pad:
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@Varargs:
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@Returns:
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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_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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<!-- ##### STRUCT GstRealPad ##### -->
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<para>
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</para>
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@pad:
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@caps:
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@direction:
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@threadstate:
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@peer:
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@bufpen:
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@regiontype:
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@offset:
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@len:
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@sched:
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@chainfunc:
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@chainhandler:
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@getfunc:
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@gethandler:
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@eventfunc:
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@eventhandler:
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@getregionfunc:
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@pullregionfunc:
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@negotiatefunc:
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@newcapsfunc:
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@bufferpoolfunc:
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@ghostpads:
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<!-- ##### MACRO GST_RPAD_LEN ##### -->
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<para>
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Get the length of the region that is being pulled.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_OFFSET ##### -->
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<para>
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Get the offset of the region that is being pulled.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_SCHED ##### -->
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<para>
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Get the scheduler of this real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_REGIONTYPE ##### -->
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<para>
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Get the type of the region that is being pulled.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_DIRECTION ##### -->
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<para>
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Get the direction of the real pad.
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</para>
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@pad: the realpad to query.
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<!-- ##### MACRO GST_RPAD_CAPS ##### -->
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<para>
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Get the caps of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_PEER ##### -->
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<para>
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Get the peer element of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_BUFPEN ##### -->
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<para>
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Get the bufpen of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_CHAINFUNC ##### -->
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<para>
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Get the chain function of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_GETFUNC ##### -->
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<para>
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Get get getfunction of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_GETREGIONFUNC ##### -->
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<para>
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Get the getregion function of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_PULLREGIONFUNC ##### -->
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<para>
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Get the pullregion function of the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_NEGOTIATEFUNC ##### -->
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<para>
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Get the negotiate function from the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_NEWCAPSFUNC ##### -->
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<para>
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Get the newcaps function from the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_BUFFERPOOLFUNC ##### -->
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<para>
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Get the bufferpoolfunction from the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_CHAINHANDLER ##### -->
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<para>
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Get the eventhandler function from the real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_EVENTFUNC ##### -->
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<para>
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Get the event function of this real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_EVENTHANDLER ##### -->
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<para>
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Get the eventhandler function of this real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_RPAD_GETHANDLER ##### -->
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<para>
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Get the gethandler function of this real pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### MACRO GST_GPAD_REALPAD ##### -->
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<para>
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Get the real pad of this ghost pad.
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</para>
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@pad: the real pad to query.
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<!-- ##### STRUCT GstGhostPad ##### -->
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<para>
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</para>
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@pad:
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@realpad:
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<!-- ##### FUNCTION gst_ghost_pad_new ##### -->
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<para>
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</para>
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@name:
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@pad:
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@Returns:
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