mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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788 lines
11 KiB
Plaintext
788 lines
11 KiB
Plaintext
<!-- ##### 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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</para>
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@pad: the pad to get a buffer from
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@offset: the offset of the region to get
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@size: the size of the region to get
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@Returns: a #GstBuffer
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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 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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<!-- ##### 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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</para>
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@pad: the pad to pull
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@offset: the offset of the region to pull
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@size: the size of the region to pull
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@Returns: a GstBuffer
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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_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_caps_list ##### -->
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<para>
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</para>
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@pad:
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@caps:
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<!-- ##### FUNCTION gst_pad_get_caps_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_caps_by_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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@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_add_ghost_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_remove_ghost_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_ghost_parents ##### -->
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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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<!-- ##### 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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@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_pull_region ##### -->
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<para>
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</para>
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@pad:
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@offset:
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@size:
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@Returns:
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<!-- ##### MACRO gst_pad_pullregion ##### -->
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<para>
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</para>
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@pad:
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@offset:
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@size:
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<!-- ##### FUNCTION gst_pad_select ##### -->
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<para>
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</para>
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@nextpad:
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@Varargs:
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@Returns:
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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_eos_func ##### -->
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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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</para>
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@pad:
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<!-- ##### FUNCTION gst_pad_save_thyself ##### -->
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<para>
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</para>
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@pad:
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@parent:
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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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@parent:
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@element:
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@elements:
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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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@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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@ghostparents:
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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_PUSHFUNC ##### -->
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<para>
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Get the pushfunction 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_PULLFUNC ##### -->
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<para>
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Get the pullfunction 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_QOSFUNC ##### -->
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<para>
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Get the QoS 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_EOSFUNC ##### -->
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<para>
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Get the EOS 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_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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<!-- ##### TYPEDEF GstPadFactoryEntry ##### -->
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<para>
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Defines an entry for a padfactory.
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</para>
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<!-- ##### TYPEDEF GstPadFactory[] ##### -->
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<para>
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The padfactory.
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</para>
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<!-- ##### MACRO GST_PAD_FACTORY_SOMETIMES ##### -->
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<para>
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Indicate that this pad will become available depending
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on the media type. Use this in the factory definition.
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</para>
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<!-- ##### MACRO GST_PAD_FACTORY_ALWAYS ##### -->
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<para>
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Indicate that this pad will always be available.
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Use this in the factory definition.
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</para>
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<!-- ##### MACRO GST_PAD_FACTORY_REQUEST ##### -->
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<para>
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Indicates that this pad will be available on request. Use
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this in the factory definition.
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</para>
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<!-- ##### MACRO GST_PAD_FACTORY_SINK ##### -->
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<para>
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Indicates a sinkpad for the padfactory.
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</para>
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<!-- ##### MACRO GST_PAD_FACTORY_SRC ##### -->
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<para>
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Indicates a srcpad for the padfactory.
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</para>
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<!-- ##### MACRO GST_PAD_FACTORY_CAPS ##### -->
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<para>
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Starts the declaration of a the capabilities for this padtemplate.
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</para>
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@a...: a capability factory
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<!-- ##### ENUM GstPadPresence ##### -->
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<para>
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Indicates when this pad will become available.
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</para>
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@GST_PAD_ALWAYS: the pad is always available
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@GST_PAD_SOMETIMES: the pad will become available depending on the media stream
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@GST_PAD_REQUEST:
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<!-- ##### STRUCT GstPadTemplate ##### -->
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<para>
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</para>
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@object:
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@name_template:
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@direction:
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@presence:
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@caps:
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<!-- ##### FUNCTION gst_padtemplate_new ##### -->
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<para>
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</para>
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@factory:
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@Returns:
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<!-- ##### FUNCTION gst_padtemplate_create ##### -->
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<para>
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</para>
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@name_template:
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@direction:
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@presence:
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@caps:
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@Returns:
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<!-- ##### FUNCTION gst_padtemplate_load_thyself ##### -->
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<para>
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</para>
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@parent:
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@Returns:
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<!-- ##### FUNCTION gst_padtemplate_save_thyself ##### -->
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<para>
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</para>
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@templ:
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@parent:
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@Returns:
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<!-- # Unused Parameters # -->
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@pad:
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