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5d2a56cd7c
Original commit message from CVS: Removed the last bits of Metadata. Updated the bufferpool docs.
1059 lines
17 KiB
Text
1059 lines
17 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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PedTemplates are use to describe the runtime behaviour of an element and what pads it
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will have during its lifetime. Pads are typically created from a padtemplate with
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GST_PADTEMPLATE_NEW() or with the factory macro GST_PADTEMPLATE_FACTORY().
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</para>
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<para>
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Pad and PadTemplates 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. gst_padtemplate_get_caps() is used to get the
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caps of a padtemplate. It's not possible to modify the caps of a padtemplate after
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creation. The following code example shows the code to create a pad from a padtemplate.
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<programlisting>
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GST_PADTEMPLATE_FACTORY (my_factory,
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"sink", /* the name of the pad */
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GST_PAD_SINK, /* the direction of the pad */
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GST_PAD_ALWAYS, /* when this pad will be present */
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GST_CAPS_NEW ( /* the capabilities of the padtemplate */
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"my_caps",
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"audio/raw",
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"format", GST_PROPS_STRING ("int"),
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"channels", GST_PROPS_INT_RANGE (1, 6)
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)
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)
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void
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my_method (void)
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{
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GstPad *pad;
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pad = gst_pad_new_from_template (GST_PADTEMPLATE_GET (my_factory), "sink");
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...
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}
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</programlisting>
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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).
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GstCaps, #GstElement
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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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The function that will be called when the caps of the pad has
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changed.
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</para>
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@pad: The pad that has its caps changed
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@caps: the new caps of the pad
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<!-- ##### USER_FUNCTION GstPadBufferPoolFunction ##### -->
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<para>
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The function that will be called when a bufferpool is requested
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from this pad.
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</para>
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@pad: the pad with the bufferpool
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@Returns: the GstBufferPool associated with this pad.
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<!-- ##### ENUM GstPadNegotiateReturn ##### -->
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<para>
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The possible results from padnegotiation.
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</para>
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@GST_PAD_NEGOTIATE_FAIL: The pads could not agree about the media type.
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@GST_PAD_NEGOTIATE_AGREE: The pads agreed about the media type.
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@GST_PAD_NEGOTIATE_TRY: The pad did not agree and suggests another media type.
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<!-- ##### USER_FUNCTION GstPadNegotiateFunction ##### -->
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<para>
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The function that will be called when negotiating.
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</para>
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@pad: The pad that is being negotiated
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@caps: The current caps that are being negotiated
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@data: A generic gpointer that can be used to store user_data
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@Returns: The result of the negotiation process
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<!-- ##### 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_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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</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_bufferpool_function ##### -->
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<para>
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</para>
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@pad:
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@bufpool:
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<!-- ##### FUNCTION gst_pad_set_caps ##### -->
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<para>
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</para>
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@pad:
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@caps:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_caps ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_check_compatibility ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_name ##### -->
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<para>
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</para>
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@pad:
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@name:
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<!-- ##### FUNCTION gst_pad_get_name ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_element_private ##### -->
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<para>
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</para>
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@pad:
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@priv:
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<!-- ##### FUNCTION gst_pad_get_element_private ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_parent ##### -->
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<para>
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</para>
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@pad:
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@parent:
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<!-- ##### FUNCTION gst_pad_get_parent ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_sched ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_set_sched ##### -->
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<para>
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</para>
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@pad:
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@sched:
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<!-- ##### FUNCTION gst_pad_get_real_parent ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_add_ghost_pad ##### -->
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<para>
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</para>
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@pad:
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@ghostpad:
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<!-- ##### FUNCTION gst_pad_remove_ghost_pad ##### -->
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<para>
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</para>
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@pad:
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@ghostpad:
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<!-- ##### FUNCTION gst_pad_get_ghost_pad_list ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_get_peer ##### -->
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<para>
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</para>
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@pad:
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@Returns:
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<!-- ##### FUNCTION gst_pad_connect ##### -->
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<para>
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</para>
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@srcpad:
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@sinkpad:
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@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_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>
|
|
|
|
@self:
|
|
@parent:
|
|
<!-- # Unused Parameters # -->
|
|
@element:
|
|
@elements:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_negotiate_proxy ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@srcpad:
|
|
@destpad:
|
|
@caps:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@counter:
|
|
@count:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_renegotiate ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_padtemplate ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_get_padtemplate_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_eos_func ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### STRUCT GstRealPad ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
@caps:
|
|
@direction:
|
|
@threadstate:
|
|
@peer:
|
|
@bufpen:
|
|
@regiontype:
|
|
@offset:
|
|
@len:
|
|
@sched:
|
|
@chainfunc:
|
|
@getfunc:
|
|
@getregionfunc:
|
|
@qosfunc:
|
|
@eosfunc:
|
|
@pushfunc:
|
|
@pullfunc:
|
|
@pullregionfunc:
|
|
@negotiatefunc:
|
|
@newcapsfunc:
|
|
@bufferpoolfunc:
|
|
@ghostpads:
|
|
|
|
<!-- ##### MACRO GST_RPAD_LEN ##### -->
|
|
<para>
|
|
Get the length of the region that is being pulled.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_OFFSET ##### -->
|
|
<para>
|
|
Get the offset of the region that is being pulled.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_SCHED ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@pad:
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_REGIONTYPE ##### -->
|
|
<para>
|
|
Get the type of the region that is being pulled.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_DIRECTION ##### -->
|
|
<para>
|
|
Get the direction of the real pad.
|
|
</para>
|
|
|
|
@pad: the realpad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_CAPS ##### -->
|
|
<para>
|
|
Get the caps of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_PEER ##### -->
|
|
<para>
|
|
Get the peer element of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_BUFPEN ##### -->
|
|
<para>
|
|
Get the bufpen of the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_CHAINFUNC ##### -->
|
|
<para>
|
|
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>
|
|
Get the negotiate function from the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_NEWCAPSFUNC ##### -->
|
|
<para>
|
|
Get the newcaps function from the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### MACRO GST_RPAD_BUFFERPOOLFUNC ##### -->
|
|
<para>
|
|
Get the bufferpoolfunction from the real pad.
|
|
</para>
|
|
|
|
@pad: the real pad to query.
|
|
|
|
|
|
<!-- ##### 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:
|
|
|
|
|
|
<!-- ##### 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: th pad is only available on request with
|
|
gst_element_request_pad_by_name() or gst_element_request_compatible_pad().
|
|
|
|
<!-- ##### STRUCT GstPadTemplate ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@object:
|
|
@name_template:
|
|
@direction:
|
|
@presence:
|
|
@caps:
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_CAPS ##### -->
|
|
<para>
|
|
Get a handle to the padtemplate #GstCaps
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_DIRECTION ##### -->
|
|
<para>
|
|
Get the direction of the padtemplate.
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_NAME_TEMPLATE ##### -->
|
|
<para>
|
|
Get the nametemplate of the padtemplate.
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_PRESENCE ##### -->
|
|
<para>
|
|
Get the presence of the padtemplate.
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_NEW ##### -->
|
|
<para>
|
|
Create a new padtemplate.
|
|
</para>
|
|
|
|
@padname: the nametemplate for the pads that will be created with this template
|
|
@dir: the direction of the pads.
|
|
@pres: the presence of the pads.
|
|
@a...: the capabilities of this padtemplate usually created with GST_CAPS_NEW()
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_FACTORY ##### -->
|
|
<para>
|
|
Create a factory for a padtemplate. This can be used if you only want one instance
|
|
of the padtemplate. Use GST_PADTEMPLATE_GET() to get the unique padtemplate.
|
|
</para>
|
|
|
|
@name: th name of the factory
|
|
@padname: the nametemplate of the pads
|
|
@dir: the direction of the pads.
|
|
@pres: the presence of the pads.
|
|
@a...: the capabilities of this padtemplate, usually created with GST_CAPS_NEW()
|
|
|
|
|
|
<!-- ##### MACRO GST_PADTEMPLATE_GET ##### -->
|
|
<para>
|
|
Get the padtemplate of the factory created with GST_PADTEMPLATE_FACTORY()
|
|
</para>
|
|
|
|
@fact: the factory name to get the padtemplate from.
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_new ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@name_template:
|
|
@direction:
|
|
@presence:
|
|
@caps:
|
|
@Varargs:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_load_thyself ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@parent:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_save_thyself ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@parent:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_get_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_padtemplate_get_caps_by_name ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@name:
|
|
@Returns:
|
|
|
|
|