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In most places in core and baseclasses we just need the caps to do caps- intersections. In that case ref'ed caps are enough (no need to copy). This patch also switches the code to use the new functions. API: gst_pad_get_caps_refed(), gst_pad_peer_get_caps_refed()
1230 lines
34 KiB
C
1230 lines
34 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION: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 other
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* #GstElements. This is where GhostPads come into play. A GhostPad acts as a
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* proxy for another pad. Thus the bin can have sink and source ghost-pads that
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* 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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* Last reviewed on 2005-11-18 (0.9.5)
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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_PROXY_PAD_PRIVATE (pad)->target)
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#define GST_PROXY_PAD_INTERNAL(pad) (GST_PROXY_PAD_PRIVATE (pad)->internal)
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#define GST_PROXY_PAD_RETARGET(pad) (GST_PROXY_PAD_PRIVATE (pad)->retarget)
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#define GST_PROXY_GET_LOCK(pad) (GST_PROXY_PAD_PRIVATE (pad)->proxy_lock)
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#define GST_PROXY_LOCK(pad) (g_mutex_lock (GST_PROXY_GET_LOCK (pad)))
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#define GST_PROXY_UNLOCK(pad) (g_mutex_unlock (GST_PROXY_GET_LOCK (pad)))
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struct _GstProxyPadPrivate
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{
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/* with PROXY_LOCK */
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GMutex *proxy_lock;
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GstPad *target;
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GstPad *internal;
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gboolean retarget;
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};
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G_DEFINE_TYPE (GstProxyPad, gst_proxy_pad, GST_TYPE_PAD);
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static GstPad *gst_proxy_pad_get_target (GstPad * pad);
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static void gst_proxy_pad_dispose (GObject * object);
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static void gst_proxy_pad_finalize (GObject * object);
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#ifndef GST_DISABLE_LOADSAVE
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static xmlNodePtr gst_proxy_pad_save_thyself (GstObject * object,
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xmlNodePtr parent);
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#endif
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static void on_src_target_notify (GstPad * target,
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GParamSpec * unused, gpointer user_data);
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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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GObjectClass *gobject_class = (GObjectClass *) klass;
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g_type_class_add_private (klass, sizeof (GstProxyPadPrivate));
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gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_proxy_pad_dispose);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_proxy_pad_finalize);
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#ifndef GST_DISABLE_LOADSAVE
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{
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GstObjectClass *gstobject_class = (GstObjectClass *) klass;
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gstobject_class->save_thyself =
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GST_DEBUG_FUNCPTR (gst_proxy_pad_save_thyself);
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}
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#endif
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}
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static const GstQueryType *
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gst_proxy_pad_do_query_type (GstPad * pad)
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{
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GstPad *target = gst_proxy_pad_get_target (pad);
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const GstQueryType *res = NULL;
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if (target) {
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res = gst_pad_get_query_types (target);
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gst_object_unref (target);
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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_proxy_pad_do_event (GstPad * pad, GstEvent * event)
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{
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gboolean res = FALSE;
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GstPad *internal = GST_PROXY_PAD_INTERNAL (pad);
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res = gst_pad_push_event (internal, event);
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return res;
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}
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static gboolean
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gst_proxy_pad_do_query (GstPad * pad, GstQuery * query)
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{
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gboolean res = FALSE;
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GstPad *target = gst_proxy_pad_get_target (pad);
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if (target) {
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res = gst_pad_query (target, query);
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gst_object_unref (target);
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}
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return res;
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}
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static GstIterator *
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gst_proxy_pad_do_iterate_internal_links (GstPad * pad)
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{
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GstIterator *res = NULL;
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GstPad *target = gst_proxy_pad_get_target (pad);
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if (target) {
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res = gst_pad_iterate_internal_links (target);
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gst_object_unref (target);
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}
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return res;
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}
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static GstFlowReturn
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gst_proxy_pad_do_bufferalloc (GstPad * pad, guint64 offset, guint size,
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GstCaps * caps, GstBuffer ** buf)
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{
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GstFlowReturn result;
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GstPad *internal = GST_PROXY_PAD_INTERNAL (pad);
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result = gst_pad_alloc_buffer (internal, offset, size, caps, buf);
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return result;
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}
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static GstFlowReturn
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gst_proxy_pad_do_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstFlowReturn res;
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GstPad *internal = GST_PROXY_PAD_INTERNAL (pad);
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res = gst_pad_push (internal, buffer);
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return res;
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}
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static GstFlowReturn
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gst_proxy_pad_do_chain_list (GstPad * pad, GstBufferList * list)
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{
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GstFlowReturn res;
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GstPad *internal = GST_PROXY_PAD_INTERNAL (pad);
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res = gst_pad_push_list (internal, list);
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return res;
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}
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static GstFlowReturn
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gst_proxy_pad_do_getrange (GstPad * pad, guint64 offset, guint size,
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GstBuffer ** buffer)
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{
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GstFlowReturn res;
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GstPad *internal = GST_PROXY_PAD_INTERNAL (pad);
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res = gst_pad_pull_range (internal, offset, size, buffer);
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return res;
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}
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static gboolean
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gst_proxy_pad_do_checkgetrange (GstPad * pad)
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{
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gboolean result;
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GstPad *internal = GST_PROXY_PAD_INTERNAL (pad);
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result = gst_pad_check_pull_range (internal);
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return result;
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}
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static GstCaps *
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gst_proxy_pad_do_getcaps (GstPad * pad)
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{
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GstPad *target = gst_proxy_pad_get_target (pad);
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GstCaps *res;
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GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (pad);
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if (target) {
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/* if we have a real target, proxy the call */
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res = gst_pad_get_caps_refed (target);
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GST_DEBUG_OBJECT (pad, "get caps of target %s:%s : %" GST_PTR_FORMAT,
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GST_DEBUG_PAD_NAME (target), res);
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gst_object_unref (target);
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/* filter against the template */
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if (templ && res) {
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GstCaps *filt, *tmp;
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filt = GST_PAD_TEMPLATE_CAPS (templ);
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if (filt) {
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tmp = gst_caps_intersect (filt, res);
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gst_caps_unref (res);
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res = tmp;
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GST_DEBUG_OBJECT (pad,
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"filtered against template gives %" GST_PTR_FORMAT, res);
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}
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}
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} else {
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/* else, if we have a template, use its caps. */
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if (templ) {
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res = GST_PAD_TEMPLATE_CAPS (templ);
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GST_DEBUG_OBJECT (pad,
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"using pad template %p with caps %p %" GST_PTR_FORMAT, templ, res,
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res);
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res = gst_caps_ref (res);
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goto done;
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}
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/* last resort, any caps */
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GST_DEBUG_OBJECT (pad, "pad has no template, returning ANY");
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res = gst_caps_new_any ();
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}
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done:
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return res;
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}
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static gboolean
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gst_proxy_pad_do_acceptcaps (GstPad * pad, GstCaps * caps)
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{
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GstPad *target = gst_proxy_pad_get_target (pad);
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gboolean res;
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if (target) {
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res = gst_pad_accept_caps (target, caps);
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gst_object_unref (target);
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} else {
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/* We don't have a target, we return TRUE and we assume that any future
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* target will be able to deal with any configured caps. */
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res = TRUE;
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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_proxy_pad_do_fixatecaps (GstPad * pad, GstCaps * caps)
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{
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GstPad *target = gst_proxy_pad_get_target (pad);
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if (target) {
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gst_pad_fixate_caps (target, caps);
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gst_object_unref (target);
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}
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}
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static gboolean
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gst_proxy_pad_do_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstPad *target = gst_proxy_pad_get_target (pad);
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gboolean res;
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if (target) {
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res = gst_pad_set_caps (target, caps);
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gst_object_unref (target);
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} else {
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/* We don't have any target, but we shouldn't return FALSE since this
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* would stop the actual push of a buffer (which might trigger a pad block
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* or probe, or properly return GST_FLOW_NOT_LINKED.
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*/
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res = TRUE;
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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_proxy_pad_set_target_unlocked (GstPad * pad, GstPad * target)
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{
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GstPad *oldtarget;
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if (target) {
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GST_LOG_OBJECT (pad, "setting target %s:%s", GST_DEBUG_PAD_NAME (target));
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if (G_UNLIKELY (GST_PAD_DIRECTION (pad) != GST_PAD_DIRECTION (target)))
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goto wrong_direction;
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} else
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GST_LOG_OBJECT (pad, "clearing target");
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/* clear old target */
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if ((oldtarget = GST_PROXY_PAD_TARGET (pad)))
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gst_object_unref (oldtarget);
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/* set and ref new target if any */
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if (target)
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GST_PROXY_PAD_TARGET (pad) = gst_object_ref (target);
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else
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GST_PROXY_PAD_TARGET (pad) = NULL;
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return TRUE;
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/* ERRORS */
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wrong_direction:
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{
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GST_ERROR_OBJECT (pad,
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"target pad doesn't have the same direction as ourself");
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return FALSE;
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}
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}
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static gboolean
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gst_proxy_pad_set_target (GstPad * pad, GstPad * target)
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{
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gboolean result;
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GST_PROXY_LOCK (pad);
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result = gst_proxy_pad_set_target_unlocked (pad, target);
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GST_PROXY_UNLOCK (pad);
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return result;
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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_PROXY_LOCK (pad);
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target = GST_PROXY_PAD_TARGET (pad);
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if (target)
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gst_object_ref (target);
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GST_PROXY_UNLOCK (pad);
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return target;
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}
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static void
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gst_proxy_pad_do_unlink (GstPad * pad)
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{
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GstPad *internal;
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/* don't do anything if this unlink resulted from retargeting the pad
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* controlled by the ghostpad. We only want to invalidate the target pad when
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* the element suddently unlinked with our internal pad. */
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if (GST_PROXY_PAD_RETARGET (pad))
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return;
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internal = GST_PROXY_PAD_INTERNAL (pad);
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GST_DEBUG_OBJECT (pad, "pad is unlinked");
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gst_proxy_pad_set_target (internal, NULL);
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}
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static void
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gst_proxy_pad_dispose (GObject * object)
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{
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GstPad *pad = GST_PAD (object);
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GstPad **target_p;
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GST_PROXY_LOCK (pad);
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/* remove and unref the target */
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target_p = &GST_PROXY_PAD_TARGET (pad);
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gst_object_replace ((GstObject **) target_p, NULL);
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/* The internal is only cleared by GstGhostPad::dispose, since it is the
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* parent of non-ghost GstProxyPad and owns the refcount on the internal.
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*/
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GST_PROXY_UNLOCK (pad);
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G_OBJECT_CLASS (gst_proxy_pad_parent_class)->dispose (object);
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}
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static void
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gst_proxy_pad_finalize (GObject * object)
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{
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GstProxyPad *pad = GST_PROXY_PAD (object);
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g_mutex_free (GST_PROXY_GET_LOCK (pad));
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GST_PROXY_GET_LOCK (pad) = NULL;
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G_OBJECT_CLASS (gst_proxy_pad_parent_class)->finalize (object);
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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) = G_TYPE_INSTANCE_GET_PRIVATE (ppad,
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GST_TYPE_PROXY_PAD, GstProxyPadPrivate);
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GST_PROXY_GET_LOCK (pad) = g_mutex_new ();
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gst_pad_set_query_type_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_query_type));
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gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_proxy_pad_do_event));
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gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_proxy_pad_do_query));
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gst_pad_set_iterate_internal_links_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_iterate_internal_links));
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gst_pad_set_getcaps_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_getcaps));
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gst_pad_set_acceptcaps_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_acceptcaps));
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gst_pad_set_fixatecaps_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_fixatecaps));
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gst_pad_set_setcaps_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_setcaps));
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gst_pad_set_unlink_function (pad,
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GST_DEBUG_FUNCPTR (gst_proxy_pad_do_unlink));
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}
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|
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#ifndef GST_DISABLE_LOADSAVE
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/**
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* gst_proxy_pad_save_thyself:
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* @pad: a ghost #GstPad to save.
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* @parent: the parent #xmlNodePtr to save the description in.
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*
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* Saves the ghost pad into an xml representation.
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*
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* Returns: the #xmlNodePtr representation of the pad.
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*/
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static xmlNodePtr
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gst_proxy_pad_save_thyself (GstObject * object, xmlNodePtr parent)
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{
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xmlNodePtr self;
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GstProxyPad *proxypad;
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GstPad *pad;
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GstPad *peer;
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g_return_val_if_fail (GST_IS_PROXY_PAD (object), NULL);
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self = xmlNewChild (parent, NULL, (xmlChar *) "ghostpad", NULL);
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xmlNewChild (self, NULL, (xmlChar *) "name",
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(xmlChar *) GST_OBJECT_NAME (object));
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xmlNewChild (self, NULL, (xmlChar *) "parent",
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(xmlChar *) GST_OBJECT_NAME (GST_OBJECT_PARENT (object)));
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proxypad = GST_PROXY_PAD_CAST (object);
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pad = GST_PAD_CAST (proxypad);
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peer = GST_PAD_CAST (pad->peer);
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|
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if (GST_IS_PAD (pad)) {
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if (GST_PAD_IS_SRC (pad))
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xmlNewChild (self, NULL, (xmlChar *) "direction", (xmlChar *) "source");
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else if (GST_PAD_IS_SINK (pad))
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xmlNewChild (self, NULL, (xmlChar *) "direction", (xmlChar *) "sink");
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else
|
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xmlNewChild (self, NULL, (xmlChar *) "direction", (xmlChar *) "unknown");
|
|
} else {
|
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xmlNewChild (self, NULL, (xmlChar *) "direction", (xmlChar *) "unknown");
|
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}
|
|
if (GST_IS_PAD (peer)) {
|
|
gchar *content = g_strdup_printf ("%s.%s",
|
|
GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer));
|
|
|
|
xmlNewChild (self, NULL, (xmlChar *) "peer", (xmlChar *) content);
|
|
g_free (content);
|
|
} else {
|
|
xmlNewChild (self, NULL, (xmlChar *) "peer", NULL);
|
|
}
|
|
|
|
return self;
|
|
}
|
|
#endif /* GST_DISABLE_LOADSAVE */
|
|
|
|
|
|
/***********************************************************************
|
|
* Ghost pads, implemented as a pair of proxy pads (sort of)
|
|
*/
|
|
|
|
|
|
#define GST_GHOST_PAD_PRIVATE(obj) (GST_GHOST_PAD_CAST (obj)->priv)
|
|
|
|
struct _GstGhostPadPrivate
|
|
{
|
|
/* with PROXY_LOCK */
|
|
gulong notify_id;
|
|
|
|
gboolean constructed;
|
|
};
|
|
|
|
G_DEFINE_TYPE (GstGhostPad, gst_ghost_pad, GST_TYPE_PROXY_PAD);
|
|
|
|
static void gst_ghost_pad_dispose (GObject * object);
|
|
|
|
static void
|
|
gst_ghost_pad_class_init (GstGhostPadClass * klass)
|
|
{
|
|
GObjectClass *gobject_class = (GObjectClass *) klass;
|
|
|
|
g_type_class_add_private (klass, sizeof (GstGhostPadPrivate));
|
|
|
|
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_ghost_pad_dispose);
|
|
}
|
|
|
|
/* see gstghostpad design docs */
|
|
static gboolean
|
|
gst_ghost_pad_internal_do_activate_push (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean ret;
|
|
GstPad *other;
|
|
|
|
GST_LOG_OBJECT (pad, "%sactivate push on %s:%s, we're ok",
|
|
(active ? "" : "de"), GST_DEBUG_PAD_NAME (pad));
|
|
|
|
/* in both cases (SRC and SINK) we activate just the internal pad. The targets
|
|
* will be activated later (or already in case of a ghost sinkpad). */
|
|
other = GST_PROXY_PAD_INTERNAL (pad);
|
|
ret = gst_pad_activate_push (other, active);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_ghost_pad_internal_do_activate_pull (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean ret;
|
|
GstPad *other;
|
|
|
|
GST_LOG_OBJECT (pad, "%sactivate pull on %s:%s", (active ? "" : "de"),
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
|
|
/* we are activated in pull mode by our peer element, which is a sinkpad
|
|
* that wants to operate in pull mode. This activation has to propagate
|
|
* upstream throught the pipeline. We call the internal activation function,
|
|
* which will trigger gst_ghost_pad_do_activate_pull, which propagates even
|
|
* further upstream */
|
|
GST_LOG_OBJECT (pad, "pad is src, activate internal");
|
|
other = GST_PROXY_PAD_INTERNAL (pad);
|
|
ret = gst_pad_activate_pull (other, active);
|
|
} else if (G_LIKELY ((other = gst_pad_get_peer (pad)))) {
|
|
/* We are SINK, the ghostpad is SRC, we propagate the activation upstream
|
|
* since we hold a pointer to the upstream peer. */
|
|
GST_LOG_OBJECT (pad, "activating peer");
|
|
ret = gst_pad_activate_pull (other, active);
|
|
gst_object_unref (other);
|
|
} else {
|
|
/* this is failure, we can't activate pull if there is no peer */
|
|
GST_LOG_OBJECT (pad, "not src and no peer, failing");
|
|
ret = FALSE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_ghost_pad_do_activate_push (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean ret;
|
|
GstPad *other;
|
|
|
|
GST_LOG_OBJECT (pad, "%sactivate push on %s:%s, proxy internal",
|
|
(active ? "" : "de"), GST_DEBUG_PAD_NAME (pad));
|
|
|
|
/* just activate the internal pad */
|
|
other = GST_PROXY_PAD_INTERNAL (pad);
|
|
ret = gst_pad_activate_push (other, active);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_ghost_pad_do_activate_pull (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean ret;
|
|
GstPad *other;
|
|
|
|
GST_LOG_OBJECT (pad, "%sactivate pull on %s:%s", (active ? "" : "de"),
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
|
|
/* the ghostpad is SRC and activated in pull mode by its peer, call the
|
|
* activation function of the internal pad to propagate the activation
|
|
* upstream */
|
|
GST_LOG_OBJECT (pad, "pad is src, activate internal");
|
|
other = GST_PROXY_PAD_INTERNAL (pad);
|
|
ret = gst_pad_activate_pull (other, active);
|
|
} else if (G_LIKELY ((other = gst_pad_get_peer (pad)))) {
|
|
/* We are SINK and activated by the internal pad, propagate activation
|
|
* upstream because we hold a ref to the upstream peer */
|
|
GST_LOG_OBJECT (pad, "activating peer");
|
|
ret = gst_pad_activate_pull (other, active);
|
|
gst_object_unref (other);
|
|
} else {
|
|
/* no peer, we fail */
|
|
GST_LOG_OBJECT (pad, "pad not src and no peer, failing");
|
|
ret = FALSE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static GstPadLinkReturn
|
|
gst_ghost_pad_do_link (GstPad * pad, GstPad * peer)
|
|
{
|
|
GstPadLinkReturn ret;
|
|
GstPad *internal;
|
|
|
|
GST_DEBUG_OBJECT (pad, "linking ghostpad");
|
|
|
|
internal = GST_PROXY_PAD_INTERNAL (pad);
|
|
if (!gst_proxy_pad_set_target (internal, peer))
|
|
goto target_failed;
|
|
|
|
ret = GST_PAD_LINK_OK;
|
|
/* if we are a source pad, we should call the peer link function
|
|
* if the peer has one, see design docs. */
|
|
if (GST_PAD_IS_SRC (pad)) {
|
|
if (GST_PAD_LINKFUNC (peer)) {
|
|
ret = GST_PAD_LINKFUNC (peer) (peer, pad);
|
|
if (ret != GST_PAD_LINK_OK)
|
|
goto link_failed;
|
|
}
|
|
}
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
target_failed:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "setting target failed");
|
|
return GST_PAD_LINK_REFUSED;
|
|
}
|
|
link_failed:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "linking failed");
|
|
/* clear target again */
|
|
gst_proxy_pad_set_target (internal, NULL);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_ghost_pad_do_unlink (GstPad * pad)
|
|
{
|
|
GstPad *internal;
|
|
|
|
internal = GST_PROXY_PAD_INTERNAL (pad);
|
|
|
|
GST_DEBUG_OBJECT (pad, "unlinking ghostpad");
|
|
|
|
/* The target of the internal pad is no longer valid */
|
|
gst_proxy_pad_set_target (internal, NULL);
|
|
}
|
|
|
|
static void
|
|
on_int_notify (GstPad * internal, GParamSpec * unused, GstGhostPad * pad)
|
|
{
|
|
GstCaps *caps;
|
|
gboolean changed;
|
|
|
|
g_object_get (internal, "caps", &caps, NULL);
|
|
|
|
GST_DEBUG_OBJECT (pad, "notified %p %" GST_PTR_FORMAT, caps, caps);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
changed = (GST_PAD_CAPS (pad) != caps);
|
|
if (changed)
|
|
gst_caps_replace (&(GST_PAD_CAPS (pad)), caps);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (changed)
|
|
g_object_notify (G_OBJECT (pad), "caps");
|
|
|
|
if (caps)
|
|
gst_caps_unref (caps);
|
|
}
|
|
|
|
static void
|
|
on_src_target_notify (GstPad * target, GParamSpec * unused, gpointer user_data)
|
|
{
|
|
GstProxyPad *proxypad;
|
|
GstGhostPad *gpad;
|
|
GstCaps *caps;
|
|
gboolean changed;
|
|
|
|
g_object_get (target, "caps", &caps, NULL);
|
|
|
|
GST_OBJECT_LOCK (target);
|
|
/* First check if the peer is still available and our proxy pad */
|
|
if (!GST_PAD_PEER (target) || !GST_IS_PROXY_PAD (GST_PAD_PEER (target))) {
|
|
GST_OBJECT_UNLOCK (target);
|
|
goto done;
|
|
}
|
|
|
|
proxypad = GST_PROXY_PAD (GST_PAD_PEER (target));
|
|
GST_PROXY_LOCK (proxypad);
|
|
/* Now check if the proxypad's internal pad is still there and
|
|
* a ghostpad */
|
|
if (!GST_PROXY_PAD_INTERNAL (proxypad) ||
|
|
!GST_IS_GHOST_PAD (GST_PROXY_PAD_INTERNAL (proxypad))) {
|
|
GST_OBJECT_UNLOCK (target);
|
|
GST_PROXY_UNLOCK (proxypad);
|
|
goto done;
|
|
}
|
|
gpad = GST_GHOST_PAD (GST_PROXY_PAD_INTERNAL (proxypad));
|
|
g_object_ref (gpad);
|
|
GST_PROXY_UNLOCK (proxypad);
|
|
GST_OBJECT_UNLOCK (target);
|
|
|
|
GST_OBJECT_LOCK (gpad);
|
|
|
|
GST_DEBUG_OBJECT (gpad, "notified %p %" GST_PTR_FORMAT, caps, caps);
|
|
|
|
changed = (GST_PAD_CAPS (gpad) != caps);
|
|
if (changed)
|
|
gst_caps_replace (&(GST_PAD_CAPS (gpad)), caps);
|
|
GST_OBJECT_UNLOCK (gpad);
|
|
if (changed)
|
|
g_object_notify (G_OBJECT (gpad), "caps");
|
|
|
|
g_object_unref (gpad);
|
|
|
|
done:
|
|
if (caps)
|
|
gst_caps_unref (caps);
|
|
}
|
|
|
|
static gboolean
|
|
gst_ghost_pad_do_setcaps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC)
|
|
return TRUE;
|
|
|
|
return gst_proxy_pad_do_setcaps (pad, caps);
|
|
}
|
|
|
|
static void
|
|
gst_ghost_pad_init (GstGhostPad * pad)
|
|
{
|
|
GST_GHOST_PAD_PRIVATE (pad) = G_TYPE_INSTANCE_GET_PRIVATE (pad,
|
|
GST_TYPE_GHOST_PAD, GstGhostPadPrivate);
|
|
|
|
gst_pad_set_setcaps_function (GST_PAD_CAST (pad),
|
|
GST_DEBUG_FUNCPTR (gst_ghost_pad_do_setcaps));
|
|
gst_pad_set_activatepull_function (GST_PAD_CAST (pad),
|
|
GST_DEBUG_FUNCPTR (gst_ghost_pad_do_activate_pull));
|
|
gst_pad_set_activatepush_function (GST_PAD_CAST (pad),
|
|
GST_DEBUG_FUNCPTR (gst_ghost_pad_do_activate_push));
|
|
}
|
|
|
|
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_do_unlink 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_PROXY_LOCK (pad);
|
|
internal = GST_PROXY_PAD_INTERNAL (pad);
|
|
|
|
gst_pad_set_activatepull_function (internal, NULL);
|
|
gst_pad_set_activatepush_function (internal, NULL);
|
|
|
|
g_signal_handler_disconnect (internal,
|
|
GST_GHOST_PAD_PRIVATE (pad)->notify_id);
|
|
|
|
/* 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_PROXY_PAD_INTERNAL (pad) = NULL;
|
|
|
|
GST_PROXY_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.
|
|
*
|
|
* Since: 0.10.22
|
|
*/
|
|
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,
|
|
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_bufferalloc_function (pad,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_bufferalloc));
|
|
gst_pad_set_chain_function (pad,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_chain));
|
|
gst_pad_set_chain_list_function (pad,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_chain_list));
|
|
} else {
|
|
gst_pad_set_getrange_function (pad,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_getrange));
|
|
gst_pad_set_checkgetrange_function (pad,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_checkgetrange));
|
|
}
|
|
|
|
/* link/unlink functions */
|
|
gst_pad_set_link_function (pad, GST_DEBUG_FUNCPTR (gst_ghost_pad_do_link));
|
|
gst_pad_set_unlink_function (pad,
|
|
GST_DEBUG_FUNCPTR (gst_ghost_pad_do_unlink));
|
|
|
|
/* 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_bufferalloc_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_bufferalloc));
|
|
gst_pad_set_chain_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_chain));
|
|
gst_pad_set_chain_list_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_chain_list));
|
|
} else {
|
|
gst_pad_set_getrange_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_getrange));
|
|
gst_pad_set_checkgetrange_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_checkgetrange));
|
|
}
|
|
|
|
GST_PROXY_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;
|
|
|
|
/* could be more general here, iterating over all writable properties...
|
|
* taking the short road for now tho */
|
|
GST_GHOST_PAD_PRIVATE (pad)->notify_id =
|
|
g_signal_connect (internal, "notify::caps", G_CALLBACK (on_int_notify),
|
|
pad);
|
|
|
|
/* call function to init values of the pad caps */
|
|
on_int_notify (internal, NULL, GST_GHOST_PAD_CAST (pad));
|
|
|
|
/* special activation functions for the internal pad */
|
|
gst_pad_set_activatepull_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_ghost_pad_internal_do_activate_pull));
|
|
gst_pad_set_activatepush_function (internal,
|
|
GST_DEBUG_FUNCPTR (gst_ghost_pad_internal_do_activate_push));
|
|
|
|
GST_PROXY_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_PROXY_UNLOCK (pad);
|
|
gst_object_unref (internal);
|
|
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) {
|
|
ret = g_object_new (GST_TYPE_GHOST_PAD, "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 (ret);
|
|
|
|
construct_failed:
|
|
/* already logged */
|
|
gst_object_unref (ret);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_ghost_pad_new_no_target:
|
|
* @name: 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: 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: the name of the new pad, or NULL to assign a default name.
|
|
* @target: 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: 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: the name of the new pad, or NULL to assign a default name.
|
|
* @target: the pad to ghost.
|
|
* @templ: 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: a new #GstPad, or NULL in case of an error.
|
|
*
|
|
* Since: 0.10.10
|
|
*/
|
|
|
|
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: the name of the new pad, or NULL to assign a default name.
|
|
* @templ: 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: a new #GstPad, or NULL in case of an error.
|
|
*
|
|
* Since: 0.10.10
|
|
*/
|
|
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: 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: 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;
|
|
gboolean result;
|
|
GstPadLinkReturn lret;
|
|
|
|
g_return_val_if_fail (GST_IS_GHOST_PAD (gpad), FALSE);
|
|
|
|
/* no need for locking, the internal pad's lifecycle is directly linked to the
|
|
* ghostpad's */
|
|
internal = GST_PROXY_PAD_INTERNAL (gpad);
|
|
|
|
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 */
|
|
GST_PROXY_LOCK (gpad);
|
|
if ((oldtarget = GST_PROXY_PAD_TARGET (gpad))) {
|
|
if (GST_PAD_IS_SRC (oldtarget)) {
|
|
g_signal_handlers_disconnect_by_func (oldtarget,
|
|
(gpointer) on_src_target_notify, NULL);
|
|
}
|
|
|
|
GST_PROXY_PAD_RETARGET (internal) = TRUE;
|
|
|
|
/* unlink internal pad */
|
|
if (GST_PAD_IS_SRC (internal))
|
|
gst_pad_unlink (internal, oldtarget);
|
|
else
|
|
gst_pad_unlink (oldtarget, internal);
|
|
|
|
GST_PROXY_PAD_RETARGET (internal) = FALSE;
|
|
}
|
|
|
|
result = gst_proxy_pad_set_target_unlocked (GST_PAD_CAST (gpad), newtarget);
|
|
GST_PROXY_UNLOCK (gpad);
|
|
|
|
if (result && newtarget) {
|
|
if (GST_PAD_IS_SRC (newtarget)) {
|
|
g_signal_connect (newtarget, "notify::caps",
|
|
G_CALLBACK (on_src_target_notify), NULL);
|
|
}
|
|
|
|
/* and link to internal pad */
|
|
GST_DEBUG_OBJECT (gpad, "connecting internal pad to target");
|
|
|
|
if (GST_PAD_IS_SRC (internal))
|
|
lret = gst_pad_link (internal, newtarget);
|
|
else
|
|
lret = gst_pad_link (newtarget, internal);
|
|
|
|
if (lret != GST_PAD_LINK_OK)
|
|
goto link_failed;
|
|
}
|
|
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
link_failed:
|
|
{
|
|
GST_WARNING_OBJECT (gpad, "could not link internal and target, reason:%d",
|
|
lret);
|
|
/* and unset target again */
|
|
gst_proxy_pad_set_target_unlocked (GST_PAD_CAST (gpad), NULL);
|
|
GST_PROXY_UNLOCK (gpad);
|
|
return FALSE;
|
|
}
|
|
}
|