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892 lines
26 KiB
C
892 lines
26 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2005 Andy Wingo <wingo@pobox.com>
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* 2006 Edward Hervey <bilboed@bilboed.com>
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*
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* gstghostpad.c: Proxy pads
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstghostpad
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* @title: GstGhostPad
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* @short_description: Pseudo link pads
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* @see_also: #GstPad
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*
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* GhostPads are useful when organizing pipelines with #GstBin like elements.
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* The idea here is to create hierarchical element graphs. The bin element
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* contains a sub-graph. Now one would like to treat the bin-element like any
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* other #GstElement. This is where GhostPads come into play. A GhostPad acts as
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* a proxy for another pad. Thus the bin can have sink and source ghost-pads
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* that are associated with sink and source pads of the child elements.
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*
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* If the target pad is known at creation time, gst_ghost_pad_new() is the
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* function to use to get a ghost-pad. Otherwise one can use gst_ghost_pad_new_no_target()
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* to create the ghost-pad and use gst_ghost_pad_set_target() to establish the
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* association later on.
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*
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* Note that GhostPads add overhead to the data processing of a pipeline.
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*/
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#include "gst_private.h"
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#include "gstinfo.h"
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#include "gstghostpad.h"
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#include "gst.h"
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#define GST_CAT_DEFAULT GST_CAT_PADS
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#define GST_PROXY_PAD_CAST(obj) ((GstProxyPad *)obj)
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#define GST_PROXY_PAD_PRIVATE(obj) (GST_PROXY_PAD_CAST (obj)->priv)
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#define GST_PROXY_PAD_TARGET(pad) (GST_PAD_PEER (GST_PROXY_PAD_INTERNAL (pad)))
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#define GST_PROXY_PAD_INTERNAL(pad) (GST_PROXY_PAD_PRIVATE (pad)->internal)
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#define GST_PROXY_PAD_ACQUIRE_INTERNAL(pad, internal, retval) \
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internal = \
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GST_PAD_CAST (gst_proxy_pad_get_internal (GST_PROXY_PAD_CAST (pad))); \
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if (internal == NULL) \
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return retval;
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#define GST_PROXY_PAD_RELEASE_INTERNAL(internal) gst_object_unref (internal);
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struct _GstProxyPadPrivate
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{
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GstPad *internal;
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};
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G_DEFINE_TYPE_WITH_PRIVATE (GstProxyPad, gst_proxy_pad, GST_TYPE_PAD);
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static GstPad *gst_proxy_pad_get_target (GstPad * pad);
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/**
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* gst_proxy_pad_iterate_internal_links_default:
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* @pad: the #GstPad to get the internal links of.
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* @parent: (allow-none): the parent of @pad or %NULL
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*
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* Invoke the default iterate internal links function of the proxy pad.
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*
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* Returns: (nullable): a #GstIterator of #GstPad, or %NULL if @pad
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* has no parent. Unref each returned pad with gst_object_unref().
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*/
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GstIterator *
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gst_proxy_pad_iterate_internal_links_default (GstPad * pad, GstObject * parent)
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{
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GstIterator *res = NULL;
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GstPad *internal;
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GValue v = { 0, };
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g_return_val_if_fail (GST_IS_PROXY_PAD (pad), NULL);
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, internal, NULL);
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g_value_init (&v, GST_TYPE_PAD);
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g_value_take_object (&v, internal);
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res = gst_iterator_new_single (GST_TYPE_PAD, &v);
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g_value_unset (&v);
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return res;
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}
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/**
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* gst_proxy_pad_chain_default:
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* @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
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* @parent: (allow-none): the parent of @pad or %NULL
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* @buffer: (transfer full): the #GstBuffer to send, return GST_FLOW_ERROR
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* if not.
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*
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* Invoke the default chain function of the proxy pad.
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*
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* Returns: a #GstFlowReturn from the pad.
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*/
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GstFlowReturn
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gst_proxy_pad_chain_default (GstPad * pad, GstObject * parent,
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GstBuffer * buffer)
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{
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GstFlowReturn res;
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GstPad *internal;
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g_return_val_if_fail (GST_IS_PROXY_PAD (pad), GST_FLOW_ERROR);
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g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, internal, GST_FLOW_NOT_LINKED);
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res = gst_pad_push (internal, buffer);
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GST_PROXY_PAD_RELEASE_INTERNAL (internal);
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return res;
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}
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/**
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* gst_proxy_pad_chain_list_default:
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* @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
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* @parent: (allow-none): the parent of @pad or %NULL
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* @list: (transfer full): the #GstBufferList to send, return GST_FLOW_ERROR
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* if not.
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*
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* Invoke the default chain list function of the proxy pad.
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*
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* Returns: a #GstFlowReturn from the pad.
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*/
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GstFlowReturn
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gst_proxy_pad_chain_list_default (GstPad * pad, GstObject * parent,
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GstBufferList * list)
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{
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GstFlowReturn res;
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GstPad *internal;
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g_return_val_if_fail (GST_IS_PROXY_PAD (pad), GST_FLOW_ERROR);
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g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, internal, GST_FLOW_NOT_LINKED);
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res = gst_pad_push_list (internal, list);
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GST_PROXY_PAD_RELEASE_INTERNAL (internal);
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return res;
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}
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/**
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* gst_proxy_pad_getrange_default:
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* @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
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* @parent: the parent of @pad
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* @offset: The start offset of the buffer
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* @size: The length of the buffer
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* @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
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* returns #GST_FLOW_ERROR if %NULL.
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*
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* Invoke the default getrange function of the proxy pad.
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*
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* Returns: a #GstFlowReturn from the pad.
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*/
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GstFlowReturn
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gst_proxy_pad_getrange_default (GstPad * pad, GstObject * parent,
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guint64 offset, guint size, GstBuffer ** buffer)
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{
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GstFlowReturn res;
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GstPad *internal;
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g_return_val_if_fail (GST_IS_PROXY_PAD (pad), GST_FLOW_ERROR);
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g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, internal, GST_FLOW_NOT_LINKED);
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res = gst_pad_pull_range (internal, offset, size, buffer);
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GST_PROXY_PAD_RELEASE_INTERNAL (internal);
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return res;
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}
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static GstPad *
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gst_proxy_pad_get_target (GstPad * pad)
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{
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GstPad *target;
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GST_OBJECT_LOCK (pad);
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target = gst_pad_get_peer (GST_PROXY_PAD_INTERNAL (pad));
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GST_OBJECT_UNLOCK (pad);
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return target;
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}
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/**
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* gst_proxy_pad_get_internal:
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* @pad: the #GstProxyPad
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*
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* Get the internal pad of @pad. Unref target pad after usage.
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*
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* The internal pad of a #GstGhostPad is the internally used
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* pad of opposite direction, which is used to link to the target.
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*
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* Returns: (transfer full) (nullable): the target #GstProxyPad, can
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* be %NULL. Unref target pad after usage.
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*/
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GstProxyPad *
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gst_proxy_pad_get_internal (GstProxyPad * pad)
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{
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GstPad *internal;
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g_return_val_if_fail (GST_IS_PROXY_PAD (pad), NULL);
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GST_OBJECT_LOCK (pad);
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internal = GST_PROXY_PAD_INTERNAL (pad);
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if (internal)
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gst_object_ref (internal);
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GST_OBJECT_UNLOCK (pad);
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return GST_PROXY_PAD_CAST (internal);
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}
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static void
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gst_proxy_pad_class_init (GstProxyPadClass * klass)
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{
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/* Register common function pointer descriptions */
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GST_DEBUG_REGISTER_FUNCPTR (gst_proxy_pad_iterate_internal_links_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_proxy_pad_chain_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_proxy_pad_chain_list_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_proxy_pad_getrange_default);
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}
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static void
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gst_proxy_pad_init (GstProxyPad * ppad)
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{
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GstPad *pad = (GstPad *) ppad;
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GST_PROXY_PAD_PRIVATE (ppad) = gst_proxy_pad_get_instance_private (ppad);
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gst_pad_set_iterate_internal_links_function (pad,
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gst_proxy_pad_iterate_internal_links_default);
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GST_PAD_SET_PROXY_CAPS (pad);
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GST_PAD_SET_PROXY_SCHEDULING (pad);
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GST_PAD_SET_PROXY_ALLOCATION (pad);
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}
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/***********************************************************************
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* Ghost pads, implemented as a pair of proxy pads (sort of)
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*/
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#define GST_GHOST_PAD_PRIVATE(obj) (GST_GHOST_PAD_CAST (obj)->priv)
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struct _GstGhostPadPrivate
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{
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/* with PROXY_LOCK */
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gboolean constructed;
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};
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G_DEFINE_TYPE_WITH_PRIVATE (GstGhostPad, gst_ghost_pad, GST_TYPE_PROXY_PAD);
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static void gst_ghost_pad_dispose (GObject * object);
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static gboolean
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gst_ghost_pad_internal_activate_push_default (GstPad * pad, GstObject * parent,
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gboolean active)
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{
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gboolean ret;
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GstPad *other;
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GST_LOG_OBJECT (pad, "%sactivate push on %s:%s, we're ok",
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(active ? "" : "de"), GST_DEBUG_PAD_NAME (pad));
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/* in both cases (SRC and SINK) we activate just the internal pad. The targets
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* will be activated later (or already in case of a ghost sinkpad). */
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, other, FALSE);
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ret = gst_pad_activate_mode (other, GST_PAD_MODE_PUSH, active);
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GST_PROXY_PAD_RELEASE_INTERNAL (other);
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return ret;
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}
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static gboolean
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gst_ghost_pad_internal_activate_pull_default (GstPad * pad, GstObject * parent,
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gboolean active)
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{
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gboolean ret;
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GstPad *other;
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GST_LOG_OBJECT (pad, "%sactivate pull on %s:%s", (active ? "" : "de"),
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GST_DEBUG_PAD_NAME (pad));
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if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
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/* we are activated in pull mode by our peer element, which is a sinkpad
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* that wants to operate in pull mode. This activation has to propagate
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* upstream through the pipeline. We call the internal activation function,
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* which will trigger gst_ghost_pad_activate_pull_default, which propagates even
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* further upstream */
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GST_LOG_OBJECT (pad, "pad is src, activate internal");
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, other, FALSE);
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ret = gst_pad_activate_mode (other, GST_PAD_MODE_PULL, active);
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GST_PROXY_PAD_RELEASE_INTERNAL (other);
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} else if (G_LIKELY ((other = gst_pad_get_peer (pad)))) {
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/* We are SINK, the ghostpad is SRC, we propagate the activation upstream
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* since we hold a pointer to the upstream peer. */
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GST_LOG_OBJECT (pad, "activating peer");
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ret = gst_pad_activate_mode (other, GST_PAD_MODE_PULL, active);
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gst_object_unref (other);
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} else if (active) {
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/* this is failure, we can't activate pull if there is no peer */
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GST_LOG_OBJECT (pad, "not src and no peer, failing");
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ret = FALSE;
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} else {
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GST_LOG_OBJECT (pad, "deactivating pull, with no peer - allowing");
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ret = TRUE;
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}
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return ret;
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}
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/**
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* gst_ghost_pad_internal_activate_mode_default:
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* @pad: the #GstPad to activate or deactivate.
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* @parent: (allow-none): the parent of @pad or %NULL
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* @mode: the requested activation mode
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* @active: whether the pad should be active or not.
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*
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* Invoke the default activate mode function of a proxy pad that is
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* owned by a ghost pad.
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*
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* Returns: %TRUE if the operation was successful.
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*/
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gboolean
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gst_ghost_pad_internal_activate_mode_default (GstPad * pad, GstObject * parent,
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GstPadMode mode, gboolean active)
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{
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gboolean res;
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g_return_val_if_fail (GST_IS_PROXY_PAD (pad), FALSE);
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switch (mode) {
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case GST_PAD_MODE_PULL:
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res = gst_ghost_pad_internal_activate_pull_default (pad, parent, active);
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break;
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case GST_PAD_MODE_PUSH:
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res = gst_ghost_pad_internal_activate_push_default (pad, parent, active);
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break;
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default:
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GST_LOG_OBJECT (pad, "unknown activation mode %d", mode);
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res = FALSE;
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break;
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}
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return res;
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}
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static gboolean
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gst_ghost_pad_activate_push_default (GstPad * pad, GstObject * parent,
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gboolean active)
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{
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gboolean ret;
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GstPad *other;
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g_return_val_if_fail (GST_IS_GHOST_PAD (pad), FALSE);
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GST_LOG_OBJECT (pad, "%sactivate push on %s:%s, proxy internal",
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(active ? "" : "de"), GST_DEBUG_PAD_NAME (pad));
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/* just activate the internal pad */
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, other, FALSE);
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ret = gst_pad_activate_mode (other, GST_PAD_MODE_PUSH, active);
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GST_PROXY_PAD_RELEASE_INTERNAL (other);
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return ret;
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}
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static gboolean
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gst_ghost_pad_activate_pull_default (GstPad * pad, GstObject * parent,
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gboolean active)
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{
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gboolean ret;
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GstPad *other;
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GST_LOG_OBJECT (pad, "%sactivate pull on %s:%s", (active ? "" : "de"),
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GST_DEBUG_PAD_NAME (pad));
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if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
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/* the ghostpad is SRC and activated in pull mode by its peer, call the
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* activation function of the internal pad to propagate the activation
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* upstream */
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GST_LOG_OBJECT (pad, "pad is src, activate internal");
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GST_PROXY_PAD_ACQUIRE_INTERNAL (pad, other, FALSE);
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ret = gst_pad_activate_mode (other, GST_PAD_MODE_PULL, active);
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GST_PROXY_PAD_RELEASE_INTERNAL (other);
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} else if (G_LIKELY ((other = gst_pad_get_peer (pad)))) {
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/* We are SINK and activated by the internal pad, propagate activation
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* upstream because we hold a ref to the upstream peer */
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GST_LOG_OBJECT (pad, "activating peer");
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ret = gst_pad_activate_mode (other, GST_PAD_MODE_PULL, active);
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gst_object_unref (other);
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} else if (active) {
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/* this is failure, we can't activate pull if there is no peer */
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GST_LOG_OBJECT (pad, "not src and no peer, failing");
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ret = FALSE;
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} else {
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GST_LOG_OBJECT (pad, "deactivating pull, with no peer - allowing");
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ret = TRUE;
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}
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return ret;
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}
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/**
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* gst_ghost_pad_activate_mode_default:
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* @pad: the #GstPad to activate or deactivate.
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* @parent: (allow-none): the parent of @pad or %NULL
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* @mode: the requested activation mode
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* @active: whether the pad should be active or not.
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*
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* Invoke the default activate mode function of a ghost pad.
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*
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* Returns: %TRUE if the operation was successful.
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*/
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gboolean
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gst_ghost_pad_activate_mode_default (GstPad * pad, GstObject * parent,
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GstPadMode mode, gboolean active)
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{
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gboolean res;
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g_return_val_if_fail (GST_IS_GHOST_PAD (pad), FALSE);
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switch (mode) {
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case GST_PAD_MODE_PULL:
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res = gst_ghost_pad_activate_pull_default (pad, parent, active);
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break;
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case GST_PAD_MODE_PUSH:
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res = gst_ghost_pad_activate_push_default (pad, parent, active);
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break;
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default:
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GST_LOG_OBJECT (pad, "unknown activation mode %d", mode);
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res = FALSE;
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break;
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}
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return res;
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}
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static void
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gst_ghost_pad_class_init (GstGhostPadClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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gobject_class->dispose = gst_ghost_pad_dispose;
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GST_DEBUG_REGISTER_FUNCPTR (gst_ghost_pad_activate_pull_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_ghost_pad_activate_push_default);
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}
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static void
|
|
gst_ghost_pad_init (GstGhostPad * pad)
|
|
{
|
|
GST_GHOST_PAD_PRIVATE (pad) = gst_ghost_pad_get_instance_private (pad);
|
|
|
|
gst_pad_set_activatemode_function (GST_PAD_CAST (pad),
|
|
gst_ghost_pad_activate_mode_default);
|
|
}
|
|
|
|
static void
|
|
gst_ghost_pad_dispose (GObject * object)
|
|
{
|
|
GstPad *pad;
|
|
GstPad *internal;
|
|
GstPad *peer;
|
|
|
|
pad = GST_PAD (object);
|
|
|
|
GST_DEBUG_OBJECT (pad, "dispose");
|
|
|
|
gst_ghost_pad_set_target (GST_GHOST_PAD (pad), NULL);
|
|
|
|
/* Unlink here so that gst_pad_dispose doesn't. That would lead to a call to
|
|
* gst_ghost_pad_unlink_default when the ghost pad is in an inconsistent state */
|
|
peer = gst_pad_get_peer (pad);
|
|
if (peer) {
|
|
if (GST_PAD_IS_SRC (pad))
|
|
gst_pad_unlink (pad, peer);
|
|
else
|
|
gst_pad_unlink (peer, pad);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
internal = GST_PROXY_PAD_INTERNAL (pad);
|
|
if (internal) {
|
|
gst_pad_set_activatemode_function (internal, NULL);
|
|
|
|
GST_PROXY_PAD_INTERNAL (pad) = NULL;
|
|
GST_PROXY_PAD_INTERNAL (internal) = NULL;
|
|
|
|
/* disposes of the internal pad, since the ghostpad is the only possible object
|
|
* that has a refcount on the internal pad. */
|
|
gst_object_unparent (GST_OBJECT_CAST (internal));
|
|
}
|
|
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
G_OBJECT_CLASS (gst_ghost_pad_parent_class)->dispose (object);
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_construct:
|
|
* @gpad: the newly allocated ghost pad
|
|
*
|
|
* Finish initialization of a newly allocated ghost pad.
|
|
*
|
|
* This function is most useful in language bindings and when subclassing
|
|
* #GstGhostPad; plugin and application developers normally will not call this
|
|
* function. Call this function directly after a call to g_object_new
|
|
* (GST_TYPE_GHOST_PAD, "direction", @dir, ..., NULL).
|
|
*
|
|
* Returns: %TRUE if the construction succeeds, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_ghost_pad_construct (GstGhostPad * gpad)
|
|
{
|
|
GstPadDirection dir, otherdir;
|
|
GstPadTemplate *templ;
|
|
GstPad *pad, *internal;
|
|
|
|
g_return_val_if_fail (GST_IS_GHOST_PAD (gpad), FALSE);
|
|
g_return_val_if_fail (!GST_GHOST_PAD_PRIVATE (gpad)->constructed, FALSE);
|
|
|
|
g_object_get (gpad, "direction", &dir, "template", &templ, NULL);
|
|
|
|
g_return_val_if_fail (dir != GST_PAD_UNKNOWN, FALSE);
|
|
|
|
pad = GST_PAD (gpad);
|
|
|
|
/* Set directional padfunctions for ghostpad */
|
|
if (dir == GST_PAD_SINK) {
|
|
gst_pad_set_chain_function (pad, gst_proxy_pad_chain_default);
|
|
gst_pad_set_chain_list_function (pad, gst_proxy_pad_chain_list_default);
|
|
} else {
|
|
gst_pad_set_getrange_function (pad, gst_proxy_pad_getrange_default);
|
|
}
|
|
|
|
/* INTERNAL PAD, it always exists and is child of the ghostpad */
|
|
otherdir = (dir == GST_PAD_SRC) ? GST_PAD_SINK : GST_PAD_SRC;
|
|
if (templ) {
|
|
internal =
|
|
g_object_new (GST_TYPE_PROXY_PAD, "name", NULL,
|
|
"direction", otherdir, "template", templ, NULL);
|
|
/* release ref obtained via g_object_get */
|
|
gst_object_unref (templ);
|
|
} else {
|
|
internal =
|
|
g_object_new (GST_TYPE_PROXY_PAD, "name", NULL,
|
|
"direction", otherdir, NULL);
|
|
}
|
|
GST_PAD_UNSET_FLUSHING (internal);
|
|
|
|
/* Set directional padfunctions for internal pad */
|
|
if (dir == GST_PAD_SRC) {
|
|
gst_pad_set_chain_function (internal, gst_proxy_pad_chain_default);
|
|
gst_pad_set_chain_list_function (internal,
|
|
gst_proxy_pad_chain_list_default);
|
|
} else {
|
|
gst_pad_set_getrange_function (internal, gst_proxy_pad_getrange_default);
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
/* now make the ghostpad a parent of the internal pad */
|
|
if (!gst_object_set_parent (GST_OBJECT_CAST (internal),
|
|
GST_OBJECT_CAST (pad)))
|
|
goto parent_failed;
|
|
|
|
/* The ghostpad is the parent of the internal pad and is the only object that
|
|
* can have a refcount on the internal pad.
|
|
* At this point, the GstGhostPad has a refcount of 1, and the internal pad has
|
|
* a refcount of 1.
|
|
* When the refcount of the GstGhostPad drops to 0, the ghostpad will dispose
|
|
* its refcount on the internal pad in the dispose method by un-parenting it.
|
|
* This is why we don't take extra refcounts in the assignments below
|
|
*/
|
|
GST_PROXY_PAD_INTERNAL (pad) = internal;
|
|
GST_PROXY_PAD_INTERNAL (internal) = pad;
|
|
|
|
/* special activation functions for the internal pad */
|
|
gst_pad_set_activatemode_function (internal,
|
|
gst_ghost_pad_internal_activate_mode_default);
|
|
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
GST_GHOST_PAD_PRIVATE (gpad)->constructed = TRUE;
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
parent_failed:
|
|
{
|
|
GST_WARNING_OBJECT (gpad, "Could not set internal pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (internal));
|
|
g_critical ("Could not set internal pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (internal));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static GstPad *
|
|
gst_ghost_pad_new_full (const gchar * name, GstPadDirection dir,
|
|
GstPadTemplate * templ)
|
|
{
|
|
GstGhostPad *ret;
|
|
g_return_val_if_fail (dir != GST_PAD_UNKNOWN, NULL);
|
|
|
|
/* OBJECT CREATION */
|
|
if (templ) {
|
|
GType pad_type =
|
|
GST_PAD_TEMPLATE_GTYPE (templ) ==
|
|
G_TYPE_NONE ? GST_TYPE_GHOST_PAD : GST_PAD_TEMPLATE_GTYPE (templ);
|
|
|
|
g_return_val_if_fail (g_type_is_a (pad_type, GST_TYPE_GHOST_PAD), NULL);
|
|
|
|
ret = g_object_new (pad_type, "name", name,
|
|
"direction", dir, "template", templ, NULL);
|
|
} else {
|
|
ret = g_object_new (GST_TYPE_GHOST_PAD, "name", name,
|
|
"direction", dir, NULL);
|
|
}
|
|
|
|
if (!gst_ghost_pad_construct (ret))
|
|
goto construct_failed;
|
|
|
|
return GST_PAD_CAST (ret);
|
|
|
|
construct_failed:
|
|
/* already logged */
|
|
gst_object_unref (ret);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_new_no_target:
|
|
* @name: (allow-none): the name of the new pad, or %NULL to assign a default name.
|
|
* @dir: the direction of the ghostpad
|
|
*
|
|
* Create a new ghostpad without a target with the given direction.
|
|
* A target can be set on the ghostpad later with the
|
|
* gst_ghost_pad_set_target() function.
|
|
*
|
|
* The created ghostpad will not have a padtemplate.
|
|
*
|
|
* Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
|
|
* case of an error.
|
|
*/
|
|
GstPad *
|
|
gst_ghost_pad_new_no_target (const gchar * name, GstPadDirection dir)
|
|
{
|
|
GstPad *ret;
|
|
|
|
g_return_val_if_fail (dir != GST_PAD_UNKNOWN, NULL);
|
|
|
|
GST_LOG ("name:%s, direction:%d", GST_STR_NULL (name), dir);
|
|
|
|
ret = gst_ghost_pad_new_full (name, dir, NULL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_new:
|
|
* @name: (allow-none): the name of the new pad, or %NULL to assign a default name
|
|
* @target: (transfer none): the pad to ghost.
|
|
*
|
|
* Create a new ghostpad with @target as the target. The direction will be taken
|
|
* from the target pad. @target must be unlinked.
|
|
*
|
|
* Will ref the target.
|
|
*
|
|
* Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
|
|
* case of an error.
|
|
*/
|
|
GstPad *
|
|
gst_ghost_pad_new (const gchar * name, GstPad * target)
|
|
{
|
|
GstPad *ret;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (target), NULL);
|
|
g_return_val_if_fail (!gst_pad_is_linked (target), NULL);
|
|
|
|
GST_LOG ("name:%s, target:%s:%s", GST_STR_NULL (name),
|
|
GST_DEBUG_PAD_NAME (target));
|
|
|
|
if ((ret = gst_ghost_pad_new_no_target (name, GST_PAD_DIRECTION (target))))
|
|
if (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (ret), target))
|
|
goto set_target_failed;
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
set_target_failed:
|
|
{
|
|
GST_WARNING_OBJECT (ret, "failed to set target %s:%s",
|
|
GST_DEBUG_PAD_NAME (target));
|
|
gst_object_unref (ret);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_new_from_template:
|
|
* @name: (allow-none): the name of the new pad, or %NULL to assign a default name.
|
|
* @target: (transfer none): the pad to ghost.
|
|
* @templ: (transfer none): the #GstPadTemplate to use on the ghostpad.
|
|
*
|
|
* Create a new ghostpad with @target as the target. The direction will be taken
|
|
* from the target pad. The template used on the ghostpad will be @template.
|
|
*
|
|
* Will ref the target.
|
|
*
|
|
* Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
|
|
* case of an error.
|
|
*/
|
|
|
|
GstPad *
|
|
gst_ghost_pad_new_from_template (const gchar * name, GstPad * target,
|
|
GstPadTemplate * templ)
|
|
{
|
|
GstPad *ret;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (target), NULL);
|
|
g_return_val_if_fail (!gst_pad_is_linked (target), NULL);
|
|
g_return_val_if_fail (templ != NULL, NULL);
|
|
g_return_val_if_fail (GST_PAD_TEMPLATE_DIRECTION (templ) ==
|
|
GST_PAD_DIRECTION (target), NULL);
|
|
|
|
GST_LOG ("name:%s, target:%s:%s, templ:%p", GST_STR_NULL (name),
|
|
GST_DEBUG_PAD_NAME (target), templ);
|
|
|
|
if ((ret = gst_ghost_pad_new_full (name, GST_PAD_DIRECTION (target), templ)))
|
|
if (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (ret), target))
|
|
goto set_target_failed;
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
set_target_failed:
|
|
{
|
|
GST_WARNING_OBJECT (ret, "failed to set target %s:%s",
|
|
GST_DEBUG_PAD_NAME (target));
|
|
gst_object_unref (ret);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_new_no_target_from_template:
|
|
* @name: (allow-none): the name of the new pad, or %NULL to assign a default name
|
|
* @templ: (transfer none): the #GstPadTemplate to create the ghostpad from.
|
|
*
|
|
* Create a new ghostpad based on @templ, without setting a target. The
|
|
* direction will be taken from the @templ.
|
|
*
|
|
* Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
|
|
* case of an error.
|
|
*/
|
|
GstPad *
|
|
gst_ghost_pad_new_no_target_from_template (const gchar * name,
|
|
GstPadTemplate * templ)
|
|
{
|
|
GstPad *ret;
|
|
|
|
g_return_val_if_fail (templ != NULL, NULL);
|
|
|
|
ret =
|
|
gst_ghost_pad_new_full (name, GST_PAD_TEMPLATE_DIRECTION (templ), templ);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_get_target:
|
|
* @gpad: the #GstGhostPad
|
|
*
|
|
* Get the target pad of @gpad. Unref target pad after usage.
|
|
*
|
|
* Returns: (transfer full) (nullable): the target #GstPad, can be
|
|
* %NULL if the ghostpad has no target set. Unref target pad after
|
|
* usage.
|
|
*/
|
|
GstPad *
|
|
gst_ghost_pad_get_target (GstGhostPad * gpad)
|
|
{
|
|
GstPad *ret;
|
|
|
|
g_return_val_if_fail (GST_IS_GHOST_PAD (gpad), NULL);
|
|
|
|
ret = gst_proxy_pad_get_target (GST_PAD_CAST (gpad));
|
|
|
|
GST_DEBUG_OBJECT (gpad, "get target %s:%s", GST_DEBUG_PAD_NAME (ret));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_set_target:
|
|
* @gpad: the #GstGhostPad
|
|
* @newtarget: (transfer none) (allow-none): the new pad target
|
|
*
|
|
* Set the new target of the ghostpad @gpad. Any existing target
|
|
* is unlinked and links to the new target are established. if @newtarget is
|
|
* %NULL the target will be cleared.
|
|
*
|
|
* Returns: %TRUE if the new target could be set. This function
|
|
* can return %FALSE when the internal pads could not be linked.
|
|
*/
|
|
gboolean
|
|
gst_ghost_pad_set_target (GstGhostPad * gpad, GstPad * newtarget)
|
|
{
|
|
GstPad *internal;
|
|
GstPad *oldtarget;
|
|
GstPadLinkReturn lret;
|
|
|
|
g_return_val_if_fail (GST_IS_GHOST_PAD (gpad), FALSE);
|
|
g_return_val_if_fail (GST_PAD_CAST (gpad) != newtarget, FALSE);
|
|
|
|
GST_OBJECT_LOCK (gpad);
|
|
internal = GST_PROXY_PAD_INTERNAL (gpad);
|
|
|
|
if (newtarget == internal) {
|
|
GST_OBJECT_UNLOCK (gpad);
|
|
GST_WARNING_OBJECT (gpad, "Target has already been set to %s:%s",
|
|
GST_DEBUG_PAD_NAME (newtarget));
|
|
return TRUE;
|
|
}
|
|
|
|
if (newtarget)
|
|
GST_DEBUG_OBJECT (gpad, "set target %s:%s", GST_DEBUG_PAD_NAME (newtarget));
|
|
else
|
|
GST_DEBUG_OBJECT (gpad, "clearing target");
|
|
|
|
/* clear old target */
|
|
if ((oldtarget = gst_pad_get_peer (internal))) {
|
|
GST_OBJECT_UNLOCK (gpad);
|
|
|
|
/* unlink internal pad */
|
|
if (GST_PAD_IS_SRC (internal))
|
|
gst_pad_unlink (internal, oldtarget);
|
|
else
|
|
gst_pad_unlink (oldtarget, internal);
|
|
|
|
gst_object_unref (oldtarget);
|
|
} else {
|
|
GST_OBJECT_UNLOCK (gpad);
|
|
}
|
|
|
|
if (newtarget) {
|
|
/* and link to internal pad without any checks */
|
|
GST_DEBUG_OBJECT (gpad, "connecting internal pad to target %"
|
|
GST_PTR_FORMAT, newtarget);
|
|
|
|
if (GST_PAD_IS_SRC (internal))
|
|
lret =
|
|
gst_pad_link_full (internal, newtarget, GST_PAD_LINK_CHECK_NOTHING);
|
|
else
|
|
lret =
|
|
gst_pad_link_full (newtarget, internal, GST_PAD_LINK_CHECK_NOTHING);
|
|
|
|
if (lret != GST_PAD_LINK_OK)
|
|
goto link_failed;
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
link_failed:
|
|
{
|
|
GST_WARNING_OBJECT (gpad, "could not link internal and target, reason:%s",
|
|
gst_pad_link_get_name (lret));
|
|
return FALSE;
|
|
}
|
|
}
|