mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-14 13:21:28 +00:00
335080574f
Original commit message from CVS: Lots of updates to the plugins for caps negotiation. Added YUY2 output to the win32 dlls. Added a colorspace converter in gstplay
970 lines
14 KiB
Text
970 lines
14 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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Elements are connected to each other via "pads", which are extremely light-weight generic
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connections.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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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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<!-- # Unused Parameters # -->
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@size: the size of the region to get
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<!-- ##### USER_FUNCTION GstPadQoSFunction ##### -->
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<para>
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The function that will be called when a QoS message is sent.
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</para>
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@pad: the pad that sent the QoS message
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@qos_message: the message
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<!-- ##### USER_FUNCTION GstPadEOSFunction ##### -->
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<para>
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The function that will be called in an EOS case.
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</para>
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@pad: the pad that needs to be set to EOS state
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@Returns: TRUE if EOS was successful, FALSE otherwise
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<!-- ##### USER_FUNCTION GstPadNewCapsFunction ##### -->
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<para>
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</para>
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@pad:
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@caps:
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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:
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@Returns: The result of the negotiation process
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<!-- # Unused Parameters # -->
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@count: A counter to keep track of the negotiation process
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<!-- ##### USER_FUNCTION GstPadPushFunction ##### -->
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<para>
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The function that will be called when pushing a buffers.
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</para>
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@pad: the pad to push
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@buf: a GstBuffer to push
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<!-- ##### USER_FUNCTION GstPadPullFunction ##### -->
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<para>
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The function that will be called when pulling buffers.
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</para>
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@pad: the pad to pull
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@Returns: a GstBuffer
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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_NONE: no type specified
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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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</para>
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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_qos_function ##### -->
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<para>
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</para>
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@pad:
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@qos:
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<!-- ##### FUNCTION gst_pad_set_eos_function ##### -->
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<para>
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</para>
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@pad:
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@eos:
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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_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_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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@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_set_eos ##### -->
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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_handle_qos ##### -->
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<para>
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</para>
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@pad:
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@qos_message:
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<!-- ##### MACRO gst_pad_eos ##### -->
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<para>
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Call the EOS function of the pad
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</para>
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@pad: the pad to call the eos function of.
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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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<!-- ##### MACRO GST_RPAD_LEN ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### MACRO GST_RPAD_OFFSET ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### MACRO GST_RPAD_REGIONTYPE ##### -->
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<para>
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</para>
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@pad:
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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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@chainfunc:
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@getfunc:
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@getregionfunc:
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@qosfunc:
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@eosfunc:
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@pushfunc:
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@pullfunc:
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@pullregionfunc:
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@negotiatefunc:
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@newcapsfunc:
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@ghostpads:
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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.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_GETFUNC ##### -->
|
|
<para>
|
|
Get get getfunction of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_GETREGIONFUNC ##### -->
|
|
<para>
|
|
Get the getregion function of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_PUSHFUNC ##### -->
|
|
<para>
|
|
Get the pushfunction of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_PULLFUNC ##### -->
|
|
<para>
|
|
Get the pullfunction of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_PULLREGIONFUNC ##### -->
|
|
<para>
|
|
Get the pullregion function of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_QOSFUNC ##### -->
|
|
<para>
|
|
Get the QoS function of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_EOSFUNC ##### -->
|
|
<para>
|
|
Get the EOS function of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_NEGOTIATEFUNC ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_NEWCAPSFUNC ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
|
|
|
|
<!-- ##### MACRO GST_GPAD_REALPAD ##### -->
|
|
<para>
|
|
Get the real pad of this ghost pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### STRUCT GstGhostPad ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@realpad:
|
|
|
|
<!-- ##### FUNCTION gst_ghost_pad_new ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@name:
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### TYPEDEF GstPadFactoryEntry ##### -->
|
|
<para>
|
|
Defines an entry for a padfactory.
|
|
</para>
|
|
|
|
|
|
<!-- ##### TYPEDEF GstPadFactory[] ##### -->
|
|
<para>
|
|
The padfactory.
|
|
</para>
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_FACTORY_SOMETIMES ##### -->
|
|
<para>
|
|
Indicate that this pad will become available depending
|
|
on the media type. Use this in the factory definition.
|
|
</para>
|
|
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_FACTORY_ALWAYS ##### -->
|
|
<para>
|
|
Indicate that this pad will always be available.
|
|
Use this in the factory definition.
|
|
</para>
|
|
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_FACTORY_REQUEST ##### -->
|
|
<para>
|
|
Indicates that this pad will be available on request. Use
|
|
this in the factory definition.
|
|
</para>
|
|
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_FACTORY_SINK ##### -->
|
|
<para>
|
|
Indicates a sinkpad for the padfactory.
|
|
</para>
|
|
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_FACTORY_SRC ##### -->
|
|
<para>
|
|
Indicates a srcpad for the padfactory.
|
|
</para>
|
|
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_FACTORY_CAPS ##### -->
|
|
<para>
|
|
Starts the declaration of a the capabilities for this padtemplate.
|
|
</para>
|
|
|
|
@a...: a capability factory
|
|
|
|
|
|
<!-- ##### ENUM GstPadPresence ##### -->
|
|
<para>
|
|
Indicates when this pad will become available.
|
|
</para>
|
|
|
|
@GST_PAD_ALWAYS: the pad is always available
|
|
@GST_PAD_SOMETIMES: the pad will become available depending on the media stream
|
|
@GST_PAD_REQUEST:
|
|
|
|
<!-- ##### STRUCT GstPadTemplate ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@object:
|
|
@name_template:
|
|
@direction:
|
|
@presence:
|
|
@caps:
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_CAPS ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_DIRECTION ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_NAME_TEMPLATE ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_PRESENCE ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_new ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@factory:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_create ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@name_template:
|
|
@direction:
|
|
@presence:
|
|
@caps:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_load_thyself ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@parent:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_save_thyself ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@parent:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@pad:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_get_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_get_caps_by_name ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@name:
|
|
@Returns:
|
|
|
|
|