mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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43cbc42c45
Original commit message from CVS: the 'brown paper bag' commit. sorry for the email spam on this one, but it will be laaaarrrggggeee
955 lines
13 KiB
Text
955 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_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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<!-- ##### MACRO GST_PAD_IS_SINK ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### MACRO GST_PAD_IS_SRC ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### MACRO GST_PAD_IS_CONNECTED ##### -->
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<para>
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</para>
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@pad:
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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 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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<!-- ##### USER_FUNCTION GstPadGetCapsFunction ##### -->
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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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<!-- ##### 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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<!-- ##### USER_FUNCTION GstPadConnectFunction ##### -->
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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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<!-- ##### ENUM GstPadConnectReturn ##### -->
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<para>
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</para>
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@GST_PAD_CONNECT_REFUSED:
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@GST_PAD_CONNECT_OK:
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@GST_PAD_CONNECT_DONE:
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@GST_PAD_CONNECT_DELAYED:
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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_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_connect_function ##### -->
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<para>
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</para>
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@pad:
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@connect:
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<!-- ##### FUNCTION gst_pad_set_getcaps_function ##### -->
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<para>
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</para>
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@pad:
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@getcaps:
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<!-- ##### FUNCTION gst_pad_try_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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@Returns:
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<!-- ##### FUNCTION gst_pad_connect_filtered ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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@filtercaps:
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@Returns:
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<!-- ##### FUNCTION gst_pad_reconnect_filtered ##### -->
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<para>
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</para>
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@pad:
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@filtercaps:
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@Returns:
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<!-- ##### FUNCTION gst_pad_try_reconnect_filtered ##### -->
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<para>
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</para>
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@pad:
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@filtercaps:
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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_proxy_connect ##### -->
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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_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_get_allowed_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_recalc_allowed_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_event_default ##### -->
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<para>
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</para>
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@pad:
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@event:
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<!-- ##### FUNCTION gst_pad_set_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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@filter:
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@appfilter:
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@direction:
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@sched:
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@sched_private:
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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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@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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@getcapsfunc:
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@connectfunc:
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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_FILTER ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### MACRO GST_RPAD_APPFILTER ##### -->
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<para>
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</para>
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@pad:
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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_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_RPAD_CONNECTFUNC ##### -->
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<para>
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</para>
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@pad:
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<!-- ##### MACRO GST_RPAD_GETCAPSFUNC ##### -->
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<para>
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</para>
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@pad:
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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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|
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@name:
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@pad:
|
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@Returns:
|
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