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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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aaba029298
Implement a default buffer-list function in case the element doesn't implement one. Also pass buffer-lists to the have-data signal, this allows us to remove some backward compatibility code.
5247 lines
145 KiB
C
5247 lines
145 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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*
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* gstpad.c: Pads for linking elements together
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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:gstpad
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* @short_description: Object contained by elements that allows links to
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* other elements
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* @see_also: #GstPadTemplate, #GstElement, #GstEvent
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*
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* A #GstElement is linked to other elements via "pads", which are extremely
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* light-weight generic link points.
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* After two pads are retrieved from an element with gst_element_get_pad(),
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* the pads can be link with gst_pad_link(). (For quick links,
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* you can also use gst_element_link(), which will make the obvious
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* link for you if it's straightforward.)
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*
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* Pads are typically created from a #GstPadTemplate with
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* gst_pad_new_from_template().
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*
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* Pads have #GstCaps attached to it to describe the media type they are
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* capable of dealing with. gst_pad_get_caps() and gst_pad_set_caps() are
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* used to manipulate the caps of the pads.
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* Pads created from a pad template cannot set capabilities that are
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* incompatible with the pad template capabilities.
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*
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* Pads without pad templates can be created with gst_pad_new(),
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* which takes a direction and a name as an argument. If the name is NULL,
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* then a guaranteed unique name will be assigned to it.
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*
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* gst_pad_get_parent() will retrieve the #GstElement that owns the pad.
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*
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* A #GstElement creating a pad will typically use the various
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* gst_pad_set_*_function() calls to register callbacks for various events
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* on the pads.
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*
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* GstElements will use gst_pad_push() and gst_pad_pull_range() to push out
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* or pull in a buffer.
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*
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* To send a #GstEvent on a pad, use gst_pad_send_event() and
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* gst_pad_push_event().
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*
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* Last reviewed on 2006-07-06 (0.10.9)
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*/
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#include "gst_private.h"
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#include "gstpad.h"
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#include "gstpadtemplate.h"
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#include "gstenumtypes.h"
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#include "gstmarshal.h"
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#include "gstutils.h"
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#include "gstinfo.h"
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#include "gsterror.h"
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#include "gstvalue.h"
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#include "glib-compat-private.h"
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GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
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#define GST_CAT_DEFAULT GST_CAT_PADS
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/* Pad signals and args */
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enum
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{
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PAD_LINKED,
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PAD_UNLINKED,
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PAD_REQUEST_LINK,
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PAD_HAVE_DATA,
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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PAD_PROP_0,
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PAD_PROP_CAPS,
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PAD_PROP_DIRECTION,
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PAD_PROP_TEMPLATE,
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/* FILL ME */
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};
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typedef struct _GstPadPushCache GstPadPushCache;
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struct _GstPadPushCache
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{
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GstPad *peer; /* reffed peer pad */
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};
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static GstPadPushCache _pad_cache_invalid = { NULL, };
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#define PAD_CACHE_INVALID (&_pad_cache_invalid)
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#define GST_PAD_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PAD, GstPadPrivate))
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/* we have a pending and an active event on the pad. On source pads only the
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* active event is used. On sinkpads, events are copied to the pending entry and
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* moved to the active event when the eventfunc returned TRUE. */
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typedef struct
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{
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GstEvent *pending;
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GstEvent *event;
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} PadEvent;
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struct _GstPadPrivate
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{
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GstPadPushCache *cache_ptr;
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PadEvent events[GST_EVENT_MAX_STICKY];
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};
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static void gst_pad_dispose (GObject * object);
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static void gst_pad_finalize (GObject * object);
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static void gst_pad_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_pad_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn handle_pad_block (GstPad * pad);
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static GstCaps *gst_pad_get_caps_unlocked (GstPad * pad, GstCaps * filter);
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static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
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static gboolean gst_pad_activate_default (GstPad * pad);
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static gboolean gst_pad_acceptcaps_default (GstPad * pad, GstCaps * caps);
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static GstFlowReturn gst_pad_chain_list_default (GstPad * pad,
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GstBufferList * list);
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static GstObjectClass *parent_class = NULL;
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static guint gst_pad_signals[LAST_SIGNAL] = { 0 };
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static GParamSpec *pspec_caps = NULL;
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/* quarks for probe signals */
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static GQuark buffer_quark;
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static GQuark buffer_list_quark;
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static GQuark event_quark;
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typedef struct
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{
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const gint ret;
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const gchar *name;
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GQuark quark;
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} GstFlowQuarks;
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static GstFlowQuarks flow_quarks[] = {
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{GST_FLOW_CUSTOM_SUCCESS, "custom-success", 0},
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{GST_FLOW_RESEND, "resend", 0},
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{GST_FLOW_OK, "ok", 0},
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{GST_FLOW_NOT_LINKED, "not-linked", 0},
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{GST_FLOW_WRONG_STATE, "wrong-state", 0},
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{GST_FLOW_UNEXPECTED, "unexpected", 0},
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{GST_FLOW_NOT_NEGOTIATED, "not-negotiated", 0},
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{GST_FLOW_ERROR, "error", 0},
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{GST_FLOW_NOT_SUPPORTED, "not-supported", 0},
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{GST_FLOW_CUSTOM_ERROR, "custom-error", 0}
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};
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/**
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* gst_flow_get_name:
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* @ret: a #GstFlowReturn to get the name of.
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*
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* Gets a string representing the given flow return.
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*
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* Returns: a static string with the name of the flow return.
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*/
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G_CONST_RETURN gchar *
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gst_flow_get_name (GstFlowReturn ret)
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{
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gint i;
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ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
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for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
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if (ret == flow_quarks[i].ret)
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return flow_quarks[i].name;
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}
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return "unknown";
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}
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/**
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* gst_flow_to_quark:
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* @ret: a #GstFlowReturn to get the quark of.
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*
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* Get the unique quark for the given GstFlowReturn.
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*
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* Returns: the quark associated with the flow return or 0 if an
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* invalid return was specified.
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*/
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GQuark
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gst_flow_to_quark (GstFlowReturn ret)
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{
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gint i;
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ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
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for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
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if (ret == flow_quarks[i].ret)
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return flow_quarks[i].quark;
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}
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return 0;
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}
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#define _do_init \
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{ \
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gint i; \
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\
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buffer_quark = g_quark_from_static_string ("buffer"); \
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buffer_list_quark = g_quark_from_static_string ("bufferlist"); \
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event_quark = g_quark_from_static_string ("event"); \
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\
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for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { \
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flow_quarks[i].quark = g_quark_from_static_string (flow_quarks[i].name); \
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} \
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\
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GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW", \
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GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads"); \
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}
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G_DEFINE_TYPE_WITH_CODE (GstPad, gst_pad, GST_TYPE_OBJECT, _do_init);
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static gboolean
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_gst_do_pass_data_accumulator (GSignalInvocationHint * ihint,
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GValue * return_accu, const GValue * handler_return, gpointer dummy)
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{
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gboolean ret = g_value_get_boolean (handler_return);
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GST_DEBUG ("accumulated %d", ret);
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g_value_set_boolean (return_accu, ret);
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return ret;
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}
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static gboolean
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default_have_data (GstPad * pad, GstMiniObject * o)
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{
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return TRUE;
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}
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static void
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gst_pad_class_init (GstPadClass * klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gstobject_class = GST_OBJECT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GstPadPrivate));
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->dispose = gst_pad_dispose;
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gobject_class->finalize = gst_pad_finalize;
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gobject_class->set_property = gst_pad_set_property;
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gobject_class->get_property = gst_pad_get_property;
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/**
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* GstPad::linked:
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* @pad: the pad that emitted the signal
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* @peer: the peer pad that has been connected
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*
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* Signals that a pad has been linked to the peer pad.
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*/
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gst_pad_signals[PAD_LINKED] =
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g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstPadClass, linked), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
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/**
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* GstPad::unlinked:
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* @pad: the pad that emitted the signal
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* @peer: the peer pad that has been disconnected
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*
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* Signals that a pad has been unlinked from the peer pad.
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*/
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gst_pad_signals[PAD_UNLINKED] =
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g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstPadClass, unlinked), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
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/**
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* GstPad::request-link:
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* @pad: the pad that emitted the signal
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* @peer: the peer pad for which a connection is requested
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*
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* Signals that a pad connection has been requested.
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*/
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gst_pad_signals[PAD_REQUEST_LINK] =
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g_signal_new ("request-link", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadClass, request_link), NULL,
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NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 0);
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/**
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* GstPad::have-data:
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* @pad: the pad that emitted the signal
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* @mini_obj: new data
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*
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* Signals that new data is available on the pad. This signal is used
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* internally for implementing pad probes.
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* See gst_pad_add_*_probe functions.
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*
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* Returns: %TRUE to keep the data, %FALSE to drop it
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*/
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gst_pad_signals[PAD_HAVE_DATA] =
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g_signal_new ("have-data", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
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G_STRUCT_OFFSET (GstPadClass, have_data),
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_gst_do_pass_data_accumulator,
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NULL, gst_marshal_BOOLEAN__POINTER, G_TYPE_BOOLEAN, 1, G_TYPE_POINTER);
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pspec_caps = g_param_spec_boxed ("caps", "Caps",
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"The capabilities of the pad", GST_TYPE_CAPS,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
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g_object_class_install_property (gobject_class, PAD_PROP_CAPS, pspec_caps);
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g_object_class_install_property (gobject_class, PAD_PROP_DIRECTION,
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g_param_spec_enum ("direction", "Direction", "The direction of the pad",
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GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
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/* FIXME, Make G_PARAM_CONSTRUCT_ONLY when we fix ghostpads. */
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g_object_class_install_property (gobject_class, PAD_PROP_TEMPLATE,
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g_param_spec_object ("template", "Template",
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"The GstPadTemplate of this pad", GST_TYPE_PAD_TEMPLATE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstobject_class->path_string_separator = ".";
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/* Register common function pointer descriptions */
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_activate_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_event_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_get_query_types_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_query_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_iterate_internal_links_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_acceptcaps_default);
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GST_DEBUG_REGISTER_FUNCPTR (gst_pad_chain_list_default);
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klass->have_data = default_have_data;
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}
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static void
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gst_pad_init (GstPad * pad)
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{
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pad->priv = GST_PAD_GET_PRIVATE (pad);
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GST_PAD_DIRECTION (pad) = GST_PAD_UNKNOWN;
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GST_PAD_ACTIVATEFUNC (pad) = gst_pad_activate_default;
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GST_PAD_EVENTFUNC (pad) = gst_pad_event_default;
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GST_PAD_QUERYTYPEFUNC (pad) = gst_pad_get_query_types_default;
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GST_PAD_QUERYFUNC (pad) = gst_pad_query_default;
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GST_PAD_ITERINTLINKFUNC (pad) = gst_pad_iterate_internal_links_default;
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GST_PAD_ACCEPTCAPSFUNC (pad) = gst_pad_acceptcaps_default;
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GST_PAD_CHAINLISTFUNC (pad) = gst_pad_chain_list_default;
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GST_PAD_SET_FLUSHING (pad);
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/* FIXME 0.11: Store this directly in the instance struct */
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pad->stream_rec_lock = g_slice_new (GStaticRecMutex);
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g_static_rec_mutex_init (pad->stream_rec_lock);
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pad->block_cond = g_cond_new ();
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}
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/* called when setting the pad inactive. It removes all sticky events from
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* the pad */
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static void
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clear_events (PadEvent events[])
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{
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guint i;
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for (i = 0; i < GST_EVENT_MAX_STICKY; i++) {
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gst_event_replace (&events[i].event, NULL);
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gst_event_replace (&events[i].pending, NULL);
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}
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}
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/* The sticky event with @idx from the srcpad is copied to the
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* pending event on the sinkpad (when different).
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* This function applies the pad offsets in case of segment events.
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* This will make sure that we send the event to the sinkpad event
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* function when the next buffer of event arrives.
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* Should be called with the OBJECT lock of both pads.
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* This function returns TRUE when there is a pending event on the
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* sinkpad */
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static gboolean
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replace_event (GstPad * srcpad, GstPad * sinkpad, guint idx)
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{
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PadEvent *srcev, *sinkev;
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GstEvent *event;
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gboolean pending = FALSE;
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srcev = &srcpad->priv->events[idx];
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if ((event = srcev->event)) {
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sinkev = &sinkpad->priv->events[idx];
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_SEGMENT:
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{
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GstSegment segment;
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gint64 offset;
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offset = srcpad->offset + sinkpad->offset;
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if (offset != 0) {
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gst_event_copy_segment (event, &segment);
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/* adjust the base time. FIXME, check negative times, try to tweak the
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* start to do clipping on negative times */
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segment.base += offset;
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/* make a new event from the updated segment */
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event = gst_event_new_segment (&segment);
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}
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break;
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}
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default:
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break;
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}
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if (sinkev->event != event) {
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/* put in the pending entry when different */
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gst_event_replace (&sinkev->pending, event);
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pending = TRUE;
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}
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}
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return pending;
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}
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/* should be called with the OBJECT_LOCK */
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static GstCaps *
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get_pad_caps (GstPad * pad)
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{
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GstCaps *caps = NULL;
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GstEvent *event;
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guint idx;
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idx = GST_EVENT_STICKY_IDX_TYPE (GST_EVENT_CAPS);
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/* we can only use the caps when we have successfully send the caps
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* event to the event function and is thus in the active entry */
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if ((event = pad->priv->events[idx].event))
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gst_event_parse_caps (event, &caps);
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return caps;
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}
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static void
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gst_pad_dispose (GObject * object)
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{
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GstPad *pad = GST_PAD_CAST (object);
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GstPad *peer;
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GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pad, "dispose");
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/* unlink the peer pad */
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if ((peer = gst_pad_get_peer (pad))) {
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/* window for MT unsafeness, someone else could unlink here
|
|
* and then we call unlink with wrong pads. The unlink
|
|
* function would catch this and safely return failed. */
|
|
if (GST_PAD_IS_SRC (pad))
|
|
gst_pad_unlink (pad, peer);
|
|
else
|
|
gst_pad_unlink (peer, pad);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
gst_pad_set_pad_template (pad, NULL);
|
|
|
|
if (pad->block_destroy_data && pad->block_data) {
|
|
pad->block_destroy_data (pad->block_data);
|
|
pad->block_data = NULL;
|
|
}
|
|
|
|
clear_events (pad->priv->events);
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
}
|
|
|
|
static void
|
|
gst_pad_finalize (GObject * object)
|
|
{
|
|
GstPad *pad = GST_PAD_CAST (object);
|
|
GstTask *task;
|
|
|
|
/* in case the task is still around, clean it up */
|
|
if ((task = GST_PAD_TASK (pad))) {
|
|
gst_task_join (task);
|
|
GST_PAD_TASK (pad) = NULL;
|
|
gst_object_unref (task);
|
|
}
|
|
|
|
if (pad->stream_rec_lock) {
|
|
g_static_rec_mutex_free (pad->stream_rec_lock);
|
|
g_slice_free (GStaticRecMutex, pad->stream_rec_lock);
|
|
pad->stream_rec_lock = NULL;
|
|
}
|
|
if (pad->block_cond) {
|
|
g_cond_free (pad->block_cond);
|
|
pad->block_cond = NULL;
|
|
}
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
static void
|
|
gst_pad_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (object));
|
|
|
|
switch (prop_id) {
|
|
case PAD_PROP_DIRECTION:
|
|
GST_PAD_DIRECTION (object) = g_value_get_enum (value);
|
|
break;
|
|
case PAD_PROP_TEMPLATE:
|
|
gst_pad_set_pad_template (GST_PAD_CAST (object),
|
|
(GstPadTemplate *) g_value_get_object (value));
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_pad_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (object));
|
|
|
|
switch (prop_id) {
|
|
case PAD_PROP_CAPS:
|
|
GST_OBJECT_LOCK (object);
|
|
g_value_set_boxed (value, get_pad_caps (GST_PAD_CAST (object)));
|
|
GST_OBJECT_UNLOCK (object);
|
|
break;
|
|
case PAD_PROP_DIRECTION:
|
|
g_value_set_enum (value, GST_PAD_DIRECTION (object));
|
|
break;
|
|
case PAD_PROP_TEMPLATE:
|
|
g_value_set_object (value, GST_PAD_PAD_TEMPLATE (object));
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_new:
|
|
* @name: the name of the new pad.
|
|
* @direction: the #GstPadDirection of the pad.
|
|
*
|
|
* Creates a new pad with the given name in the given direction.
|
|
* If name is NULL, a guaranteed unique name (across all pads)
|
|
* will be assigned.
|
|
* This function makes a copy of the name so you can safely free the name.
|
|
*
|
|
* Returns: (transfer full): a new #GstPad, or NULL in case of an error.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPad *
|
|
gst_pad_new (const gchar * name, GstPadDirection direction)
|
|
{
|
|
return g_object_new (GST_TYPE_PAD,
|
|
"name", name, "direction", direction, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_new_from_template:
|
|
* @templ: the pad template to use
|
|
* @name: the name of the element
|
|
*
|
|
* Creates a new pad with the given name from the given template.
|
|
* If name is NULL, a guaranteed unique name (across all pads)
|
|
* will be assigned.
|
|
* This function makes a copy of the name so you can safely free the name.
|
|
*
|
|
* Returns: (transfer full): a new #GstPad, or NULL in case of an error.
|
|
*/
|
|
GstPad *
|
|
gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
|
|
|
|
return g_object_new (GST_TYPE_PAD,
|
|
"name", name, "direction", templ->direction, "template", templ, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_new_from_static_template:
|
|
* @templ: the #GstStaticPadTemplate to use
|
|
* @name: the name of the element
|
|
*
|
|
* Creates a new pad with the given name from the given static template.
|
|
* If name is NULL, a guaranteed unique name (across all pads)
|
|
* will be assigned.
|
|
* This function makes a copy of the name so you can safely free the name.
|
|
*
|
|
* Returns: (transfer full): a new #GstPad, or NULL in case of an error.
|
|
*/
|
|
GstPad *
|
|
gst_pad_new_from_static_template (GstStaticPadTemplate * templ,
|
|
const gchar * name)
|
|
{
|
|
GstPad *pad;
|
|
GstPadTemplate *template;
|
|
|
|
template = gst_static_pad_template_get (templ);
|
|
pad = gst_pad_new_from_template (template, name);
|
|
gst_object_unref (template);
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_direction:
|
|
* @pad: a #GstPad to get the direction of.
|
|
*
|
|
* Gets the direction of the pad. The direction of the pad is
|
|
* decided at construction time so this function does not take
|
|
* the LOCK.
|
|
*
|
|
* Returns: the #GstPadDirection of the pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPadDirection
|
|
gst_pad_get_direction (GstPad * pad)
|
|
{
|
|
GstPadDirection result;
|
|
|
|
/* PAD_UNKNOWN is a little silly but we need some sort of
|
|
* error return value */
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
|
|
|
|
result = GST_PAD_DIRECTION (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_activate_default (GstPad * pad)
|
|
{
|
|
return gst_pad_activate_push (pad, TRUE);
|
|
}
|
|
|
|
static void
|
|
pre_activate (GstPad * pad, GstActivateMode new_mode)
|
|
{
|
|
switch (new_mode) {
|
|
case GST_ACTIVATE_PUSH:
|
|
case GST_ACTIVATE_PULL:
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_DEBUG_OBJECT (pad, "setting ACTIVATE_MODE %d, unset flushing",
|
|
new_mode);
|
|
GST_PAD_UNSET_FLUSHING (pad);
|
|
GST_PAD_ACTIVATE_MODE (pad) = new_mode;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
break;
|
|
case GST_ACTIVATE_NONE:
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_DEBUG_OBJECT (pad, "setting ACTIVATE_MODE NONE, set flushing");
|
|
_priv_gst_pad_invalidate_cache (pad);
|
|
GST_PAD_SET_FLUSHING (pad);
|
|
GST_PAD_ACTIVATE_MODE (pad) = new_mode;
|
|
/* unlock blocked pads so element can resume and stop */
|
|
GST_PAD_BLOCK_BROADCAST (pad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
post_activate (GstPad * pad, GstActivateMode new_mode)
|
|
{
|
|
switch (new_mode) {
|
|
case GST_ACTIVATE_PUSH:
|
|
case GST_ACTIVATE_PULL:
|
|
/* nop */
|
|
break;
|
|
case GST_ACTIVATE_NONE:
|
|
/* ensures that streaming stops */
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
GST_DEBUG_OBJECT (pad, "stopped streaming");
|
|
GST_OBJECT_LOCK (pad);
|
|
clear_events (pad->priv->events);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_active:
|
|
* @pad: the #GstPad to activate or deactivate.
|
|
* @active: whether or not the pad should be active.
|
|
*
|
|
* Activates or deactivates the given pad.
|
|
* Normally called from within core state change functions.
|
|
*
|
|
* If @active, makes sure the pad is active. If it is already active, either in
|
|
* push or pull mode, just return. Otherwise dispatches to the pad's activate
|
|
* function to perform the actual activation.
|
|
*
|
|
* If not @active, checks the pad's current mode and calls
|
|
* gst_pad_activate_push() or gst_pad_activate_pull(), as appropriate, with a
|
|
* FALSE argument.
|
|
*
|
|
* Returns: #TRUE if the operation was successful.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_active (GstPad * pad, gboolean active)
|
|
{
|
|
GstActivateMode old;
|
|
gboolean ret = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
old = GST_PAD_ACTIVATE_MODE (pad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (active) {
|
|
switch (old) {
|
|
case GST_ACTIVATE_PUSH:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from push");
|
|
ret = TRUE;
|
|
break;
|
|
case GST_ACTIVATE_PULL:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from pull");
|
|
ret = TRUE;
|
|
break;
|
|
case GST_ACTIVATE_NONE:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from none");
|
|
ret = (GST_PAD_ACTIVATEFUNC (pad)) (pad);
|
|
break;
|
|
default:
|
|
GST_DEBUG_OBJECT (pad, "unknown activation mode!");
|
|
break;
|
|
}
|
|
} else {
|
|
switch (old) {
|
|
case GST_ACTIVATE_PUSH:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from push");
|
|
ret = gst_pad_activate_push (pad, FALSE);
|
|
break;
|
|
case GST_ACTIVATE_PULL:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from pull");
|
|
ret = gst_pad_activate_pull (pad, FALSE);
|
|
break;
|
|
case GST_ACTIVATE_NONE:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from none");
|
|
ret = TRUE;
|
|
break;
|
|
default:
|
|
GST_DEBUG_OBJECT (pad, "unknown activation mode!");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!ret) {
|
|
GST_OBJECT_LOCK (pad);
|
|
if (!active) {
|
|
g_critical ("Failed to deactivate pad %s:%s, very bad",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
} else {
|
|
GST_WARNING_OBJECT (pad, "Failed to activate pad");
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
} else {
|
|
if (!active) {
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_RECONFIGURE);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_activate_pull:
|
|
* @pad: the #GstPad to activate or deactivate.
|
|
* @active: whether or not the pad should be active.
|
|
*
|
|
* Activates or deactivates the given pad in pull mode via dispatching to the
|
|
* pad's activatepullfunc. For use from within pad activation functions only.
|
|
* When called on sink pads, will first proxy the call to the peer pad, which
|
|
* is expected to activate its internally linked pads from within its
|
|
* activate_pull function.
|
|
*
|
|
* If you don't know what this is, you probably don't want to call it.
|
|
*
|
|
* Returns: TRUE if the operation was successful.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_activate_pull (GstPad * pad, gboolean active)
|
|
{
|
|
GstActivateMode old, new;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
old = GST_PAD_ACTIVATE_MODE (pad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (active) {
|
|
switch (old) {
|
|
case GST_ACTIVATE_PULL:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from pull, was ok");
|
|
goto was_ok;
|
|
case GST_ACTIVATE_PUSH:
|
|
GST_DEBUG_OBJECT (pad,
|
|
"activating pad from push, deactivate push first");
|
|
/* pad was activate in the wrong direction, deactivate it
|
|
* and reactivate it in pull mode */
|
|
if (G_UNLIKELY (!gst_pad_activate_push (pad, FALSE)))
|
|
goto deactivate_failed;
|
|
/* fallthrough, pad is deactivated now. */
|
|
case GST_ACTIVATE_NONE:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from none");
|
|
break;
|
|
}
|
|
} else {
|
|
switch (old) {
|
|
case GST_ACTIVATE_NONE:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from none, was ok");
|
|
goto was_ok;
|
|
case GST_ACTIVATE_PUSH:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from push, weird");
|
|
/* pad was activated in the other direction, deactivate it
|
|
* in push mode, this should not happen... */
|
|
if (G_UNLIKELY (!gst_pad_activate_push (pad, FALSE)))
|
|
goto deactivate_failed;
|
|
/* everything is fine now */
|
|
goto was_ok;
|
|
case GST_ACTIVATE_PULL:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from pull");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
|
|
if ((peer = gst_pad_get_peer (pad))) {
|
|
GST_DEBUG_OBJECT (pad, "calling peer");
|
|
if (G_UNLIKELY (!gst_pad_activate_pull (peer, active)))
|
|
goto peer_failed;
|
|
gst_object_unref (peer);
|
|
} else {
|
|
/* there is no peer, this is only fatal when we activate. When we
|
|
* deactivate, we must assume the application has unlinked the peer and
|
|
* will deactivate it eventually. */
|
|
if (active)
|
|
goto not_linked;
|
|
else
|
|
GST_DEBUG_OBJECT (pad, "deactivating unlinked pad");
|
|
}
|
|
} else {
|
|
if (G_UNLIKELY (GST_PAD_GETRANGEFUNC (pad) == NULL))
|
|
goto failure; /* Can't activate pull on a src without a
|
|
getrange function */
|
|
}
|
|
|
|
new = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
|
|
pre_activate (pad, new);
|
|
|
|
if (GST_PAD_ACTIVATEPULLFUNC (pad)) {
|
|
if (G_UNLIKELY (!GST_PAD_ACTIVATEPULLFUNC (pad) (pad, active)))
|
|
goto failure;
|
|
} else {
|
|
/* can happen for sinks of passthrough elements */
|
|
}
|
|
|
|
post_activate (pad, new);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in pull mode",
|
|
active ? "activated" : "deactivated");
|
|
|
|
return TRUE;
|
|
|
|
was_ok:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in pull mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
}
|
|
deactivate_failed:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
|
|
"failed to %s in switch to pull from mode %d",
|
|
(active ? "activate" : "deactivate"), old);
|
|
return FALSE;
|
|
}
|
|
peer_failed:
|
|
{
|
|
GST_OBJECT_LOCK (peer);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
|
|
"activate_pull on peer (%s:%s) failed", GST_DEBUG_PAD_NAME (peer));
|
|
GST_OBJECT_UNLOCK (peer);
|
|
gst_object_unref (peer);
|
|
return FALSE;
|
|
}
|
|
not_linked:
|
|
{
|
|
GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "can't activate unlinked sink "
|
|
"pad in pull mode");
|
|
return FALSE;
|
|
}
|
|
failure:
|
|
{
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in pull mode",
|
|
active ? "activate" : "deactivate");
|
|
_priv_gst_pad_invalidate_cache (pad);
|
|
GST_PAD_SET_FLUSHING (pad);
|
|
GST_PAD_ACTIVATE_MODE (pad) = old;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_activate_push:
|
|
* @pad: the #GstPad to activate or deactivate.
|
|
* @active: whether the pad should be active or not.
|
|
*
|
|
* Activates or deactivates the given pad in push mode via dispatching to the
|
|
* pad's activatepushfunc. For use from within pad activation functions only.
|
|
*
|
|
* If you don't know what this is, you probably don't want to call it.
|
|
*
|
|
* Returns: %TRUE if the operation was successful.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_activate_push (GstPad * pad, gboolean active)
|
|
{
|
|
GstActivateMode old, new;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "trying to set %s in push mode",
|
|
active ? "activated" : "deactivated");
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
old = GST_PAD_ACTIVATE_MODE (pad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (active) {
|
|
switch (old) {
|
|
case GST_ACTIVATE_PUSH:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from push, was ok");
|
|
goto was_ok;
|
|
case GST_ACTIVATE_PULL:
|
|
GST_DEBUG_OBJECT (pad,
|
|
"activating pad from push, deactivating pull first");
|
|
/* pad was activate in the wrong direction, deactivate it
|
|
* an reactivate it in push mode */
|
|
if (G_UNLIKELY (!gst_pad_activate_pull (pad, FALSE)))
|
|
goto deactivate_failed;
|
|
/* fallthrough, pad is deactivated now. */
|
|
case GST_ACTIVATE_NONE:
|
|
GST_DEBUG_OBJECT (pad, "activating pad from none");
|
|
break;
|
|
}
|
|
} else {
|
|
switch (old) {
|
|
case GST_ACTIVATE_NONE:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from none, was ok");
|
|
goto was_ok;
|
|
case GST_ACTIVATE_PULL:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from pull, weird");
|
|
/* pad was activated in the other direction, deactivate it
|
|
* in pull mode, this should not happen... */
|
|
if (G_UNLIKELY (!gst_pad_activate_pull (pad, FALSE)))
|
|
goto deactivate_failed;
|
|
/* everything is fine now */
|
|
goto was_ok;
|
|
case GST_ACTIVATE_PUSH:
|
|
GST_DEBUG_OBJECT (pad, "deactivating pad from push");
|
|
break;
|
|
}
|
|
}
|
|
|
|
new = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
|
|
pre_activate (pad, new);
|
|
|
|
if (GST_PAD_ACTIVATEPUSHFUNC (pad)) {
|
|
if (G_UNLIKELY (!GST_PAD_ACTIVATEPUSHFUNC (pad) (pad, active))) {
|
|
goto failure;
|
|
}
|
|
} else {
|
|
/* quite ok, element relies on state change func to prepare itself */
|
|
}
|
|
|
|
post_activate (pad, new);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in push mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
|
|
was_ok:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in push mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
}
|
|
deactivate_failed:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
|
|
"failed to %s in switch to push from mode %d",
|
|
(active ? "activate" : "deactivate"), old);
|
|
return FALSE;
|
|
}
|
|
failure:
|
|
{
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in push mode",
|
|
active ? "activate" : "deactivate");
|
|
_priv_gst_pad_invalidate_cache (pad);
|
|
GST_PAD_SET_FLUSHING (pad);
|
|
GST_PAD_ACTIVATE_MODE (pad) = old;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_is_active:
|
|
* @pad: the #GstPad to query
|
|
*
|
|
* Query if a pad is active
|
|
*
|
|
* Returns: TRUE if the pad is active.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_is_active (GstPad * pad)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
result = GST_PAD_MODE_ACTIVATE (GST_PAD_ACTIVATE_MODE (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_blocked:
|
|
* @pad: the #GstPad to block or unblock
|
|
* @blocked: boolean indicating whether the pad should be blocked or unblocked
|
|
* @callback: #GstPadBlockCallback that will be called when the
|
|
* operation succeeds
|
|
* @user_data: (closure): user data passed to the callback
|
|
* @destroy_data: #GDestroyNotify for user_data
|
|
*
|
|
* Blocks or unblocks the dataflow on a pad. The provided callback
|
|
* is called when the operation succeeds; this happens right before the next
|
|
* attempt at pushing a buffer on the pad.
|
|
*
|
|
* This can take a while as the pad can only become blocked when real dataflow
|
|
* is happening.
|
|
* When the pipeline is stalled, for example in PAUSED, this can
|
|
* take an indeterminate amount of time.
|
|
* You can pass NULL as the callback to make this call block. Be careful with
|
|
* this blocking call as it might not return for reasons stated above.
|
|
*
|
|
* <note>
|
|
* Pad block handlers are only called for source pads in push mode
|
|
* and sink pads in pull mode.
|
|
* </note>
|
|
*
|
|
* Returns: TRUE if the pad could be blocked. This function can fail if the
|
|
* wrong parameters were passed or the pad was already in the requested state.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_blocked (GstPad * pad, gboolean blocked,
|
|
GstPadBlockCallback callback, gpointer user_data,
|
|
GDestroyNotify destroy_data)
|
|
{
|
|
gboolean was_blocked = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
was_blocked = GST_PAD_IS_BLOCKED (pad);
|
|
|
|
if (G_UNLIKELY (was_blocked == blocked))
|
|
goto had_right_state;
|
|
|
|
if (blocked) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "blocking pad");
|
|
|
|
_priv_gst_pad_invalidate_cache (pad);
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_BLOCKED);
|
|
|
|
if (pad->block_destroy_data && pad->block_data)
|
|
pad->block_destroy_data (pad->block_data);
|
|
|
|
pad->block_callback = callback;
|
|
pad->block_data = user_data;
|
|
pad->block_destroy_data = destroy_data;
|
|
pad->block_callback_called = FALSE;
|
|
if (!callback) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "waiting for block");
|
|
GST_PAD_BLOCK_WAIT (pad);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "blocked");
|
|
}
|
|
} else {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "unblocking pad");
|
|
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKED);
|
|
|
|
if (pad->block_destroy_data && pad->block_data)
|
|
pad->block_destroy_data (pad->block_data);
|
|
|
|
pad->block_callback = callback;
|
|
pad->block_data = user_data;
|
|
pad->block_destroy_data = destroy_data;
|
|
pad->block_callback_called = FALSE;
|
|
|
|
GST_PAD_BLOCK_BROADCAST (pad);
|
|
if (!callback) {
|
|
/* no callback, wait for the unblock to happen */
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "waiting for unblock");
|
|
GST_PAD_BLOCK_WAIT (pad);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "unblocked");
|
|
}
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return TRUE;
|
|
|
|
had_right_state:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pad was in right state (%d)", was_blocked);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_is_blocked:
|
|
* @pad: the #GstPad to query
|
|
*
|
|
* Checks if the pad is blocked or not. This function returns the
|
|
* last requested state of the pad. It is not certain that the pad
|
|
* is actually blocking at this point (see gst_pad_is_blocking()).
|
|
*
|
|
* Returns: TRUE if the pad is blocked.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_is_blocked (GstPad * pad)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), result);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_is_blocking:
|
|
* @pad: the #GstPad to query
|
|
*
|
|
* Checks if the pad is blocking or not. This is a guaranteed state
|
|
* of whether the pad is actually blocking on a #GstBuffer or a #GstEvent.
|
|
*
|
|
* Returns: TRUE if the pad is blocking.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Since: 0.10.11
|
|
*/
|
|
gboolean
|
|
gst_pad_is_blocking (GstPad * pad)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), result);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
/* the blocking flag is only valid if the pad is not flushing */
|
|
result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKING) &&
|
|
!GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_activate_function:
|
|
* @pad: a #GstPad.
|
|
* @activate: the #GstPadActivateFunction to set.
|
|
*
|
|
* Sets the given activate function for @pad. The activate function will
|
|
* dispatch to gst_pad_activate_push() or gst_pad_activate_pull() to perform
|
|
* the actual activation. Only makes sense to set on sink pads.
|
|
*
|
|
* Call this function if your sink pad can start a pull-based task.
|
|
*/
|
|
void
|
|
gst_pad_set_activate_function (GstPad * pad, GstPadActivateFunction activate)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACTIVATEFUNC (pad) = activate;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatefunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (activate));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_activatepull_function:
|
|
* @pad: a #GstPad.
|
|
* @activatepull: the #GstPadActivateModeFunction to set.
|
|
*
|
|
* Sets the given activate_pull function for the pad. An activate_pull function
|
|
* prepares the element and any upstream connections for pulling. See XXX
|
|
* part-activation.txt for details.
|
|
*/
|
|
void
|
|
gst_pad_set_activatepull_function (GstPad * pad,
|
|
GstPadActivateModeFunction activatepull)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACTIVATEPULLFUNC (pad) = activatepull;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatepullfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (activatepull));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_activatepush_function:
|
|
* @pad: a #GstPad.
|
|
* @activatepush: the #GstPadActivateModeFunction to set.
|
|
*
|
|
* Sets the given activate_push function for the pad. An activate_push function
|
|
* prepares the element for pushing. See XXX part-activation.txt for details.
|
|
*/
|
|
void
|
|
gst_pad_set_activatepush_function (GstPad * pad,
|
|
GstPadActivateModeFunction activatepush)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACTIVATEPUSHFUNC (pad) = activatepush;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatepushfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (activatepush));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_chain_function:
|
|
* @pad: a sink #GstPad.
|
|
* @chain: the #GstPadChainFunction to set.
|
|
*
|
|
* Sets the given chain function for the pad. The chain function is called to
|
|
* process a #GstBuffer input buffer. see #GstPadChainFunction for more details.
|
|
*/
|
|
void
|
|
gst_pad_set_chain_function (GstPad * pad, GstPadChainFunction chain)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (GST_PAD_IS_SINK (pad));
|
|
|
|
GST_PAD_CHAINFUNC (pad) = chain;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (chain));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_chain_list_function:
|
|
* @pad: a sink #GstPad.
|
|
* @chainlist: the #GstPadChainListFunction to set.
|
|
*
|
|
* Sets the given chain list function for the pad. The chainlist function is
|
|
* called to process a #GstBufferList input buffer list. See
|
|
* #GstPadChainListFunction for more details.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
void
|
|
gst_pad_set_chain_list_function (GstPad * pad,
|
|
GstPadChainListFunction chainlist)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (GST_PAD_IS_SINK (pad));
|
|
|
|
GST_PAD_CHAINLISTFUNC (pad) = chainlist;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainlistfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (chainlist));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_getrange_function:
|
|
* @pad: a source #GstPad.
|
|
* @get: the #GstPadGetRangeFunction to set.
|
|
*
|
|
* Sets the given getrange function for the pad. The getrange function is
|
|
* called to produce a new #GstBuffer to start the processing pipeline. see
|
|
* #GstPadGetRangeFunction for a description of the getrange function.
|
|
*/
|
|
void
|
|
gst_pad_set_getrange_function (GstPad * pad, GstPadGetRangeFunction get)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (GST_PAD_IS_SRC (pad));
|
|
|
|
GST_PAD_GETRANGEFUNC (pad) = get;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getrangefunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (get));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_event_function:
|
|
* @pad: a #GstPad of either direction.
|
|
* @event: the #GstPadEventFunction to set.
|
|
*
|
|
* Sets the given event handler for the pad.
|
|
*/
|
|
void
|
|
gst_pad_set_event_function (GstPad * pad, GstPadEventFunction event)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_EVENTFUNC (pad) = event;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "eventfunc for set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (event));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_query_function:
|
|
* @pad: a #GstPad of either direction.
|
|
* @query: the #GstPadQueryFunction to set.
|
|
*
|
|
* Set the given query function for the pad.
|
|
*/
|
|
void
|
|
gst_pad_set_query_function (GstPad * pad, GstPadQueryFunction query)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_QUERYFUNC (pad) = query;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "queryfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (query));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_query_type_function:
|
|
* @pad: a #GstPad of either direction.
|
|
* @type_func: the #GstPadQueryTypeFunction to set.
|
|
*
|
|
* Set the given query type function for the pad.
|
|
*/
|
|
void
|
|
gst_pad_set_query_type_function (GstPad * pad,
|
|
GstPadQueryTypeFunction type_func)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_QUERYTYPEFUNC (pad) = type_func;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "querytypefunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (type_func));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_query_types:
|
|
* @pad: a #GstPad.
|
|
*
|
|
* Get an array of supported queries that can be performed
|
|
* on this pad.
|
|
*
|
|
* Returns: (transfer none) (array zero-terminated=1): a zero-terminated array
|
|
* of #GstQueryType.
|
|
*/
|
|
const GstQueryType *
|
|
gst_pad_get_query_types (GstPad * pad)
|
|
{
|
|
GstPadQueryTypeFunction func;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
if (G_UNLIKELY ((func = GST_PAD_QUERYTYPEFUNC (pad)) == NULL))
|
|
goto no_func;
|
|
|
|
return func (pad);
|
|
|
|
no_func:
|
|
{
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_get_query_types_dispatcher (GstPad * pad, const GstQueryType ** data)
|
|
{
|
|
*data = gst_pad_get_query_types (pad);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_query_types_default:
|
|
* @pad: a #GstPad.
|
|
*
|
|
* Invoke the default dispatcher for the query types on
|
|
* the pad.
|
|
*
|
|
* Returns: (transfer none) (array zero-terminated=1): a zero-terminated array
|
|
* of #GstQueryType, or NULL if none of the internally-linked pads has a
|
|
* query types function.
|
|
*/
|
|
const GstQueryType *
|
|
gst_pad_get_query_types_default (GstPad * pad)
|
|
{
|
|
GstQueryType *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
|
|
gst_pad_get_query_types_dispatcher, &result);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_iterate_internal_links_function:
|
|
* @pad: a #GstPad of either direction.
|
|
* @iterintlink: the #GstPadIterIntLinkFunction to set.
|
|
*
|
|
* Sets the given internal link iterator function for the pad.
|
|
*
|
|
* Since: 0.10.21
|
|
*/
|
|
void
|
|
gst_pad_set_iterate_internal_links_function (GstPad * pad,
|
|
GstPadIterIntLinkFunction iterintlink)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ITERINTLINKFUNC (pad) = iterintlink;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "internal link iterator set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (iterintlink));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_link_function:
|
|
* @pad: a #GstPad.
|
|
* @link: the #GstPadLinkFunction to set.
|
|
*
|
|
* Sets the given link function for the pad. It will be called when
|
|
* the pad is linked with another pad.
|
|
*
|
|
* The return value #GST_PAD_LINK_OK should be used when the connection can be
|
|
* made.
|
|
*
|
|
* The return value #GST_PAD_LINK_REFUSED should be used when the connection
|
|
* cannot be made for some reason.
|
|
*
|
|
* If @link is installed on a source pad, it should call the #GstPadLinkFunction
|
|
* of the peer sink pad, if present.
|
|
*/
|
|
void
|
|
gst_pad_set_link_function (GstPad * pad, GstPadLinkFunction link)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_LINKFUNC (pad) = link;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "linkfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (link));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_unlink_function:
|
|
* @pad: a #GstPad.
|
|
* @unlink: the #GstPadUnlinkFunction to set.
|
|
*
|
|
* Sets the given unlink function for the pad. It will be called
|
|
* when the pad is unlinked.
|
|
*/
|
|
void
|
|
gst_pad_set_unlink_function (GstPad * pad, GstPadUnlinkFunction unlink)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_UNLINKFUNC (pad) = unlink;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "unlinkfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (unlink));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_getcaps_function:
|
|
* @pad: a #GstPad.
|
|
* @getcaps: the #GstPadGetCapsFunction to set.
|
|
*
|
|
* Sets the given getcaps function for the pad. @getcaps should return the
|
|
* allowable caps for a pad in the context of the element's state, its link to
|
|
* other elements, and the devices or files it has opened. These caps must be a
|
|
* subset of the pad template caps. In the NULL state with no links, @getcaps
|
|
* should ideally return the same caps as the pad template. In rare
|
|
* circumstances, an object property can affect the caps returned by @getcaps,
|
|
* but this is discouraged.
|
|
*
|
|
* You do not need to call this function if @pad's allowed caps are always the
|
|
* same as the pad template caps. This can only be true if the padtemplate
|
|
* has fixed simple caps.
|
|
*
|
|
* For most filters, the caps returned by @getcaps is directly affected by the
|
|
* allowed caps on other pads. For demuxers and decoders, the caps returned by
|
|
* the srcpad's getcaps function is directly related to the stream data. Again,
|
|
* @getcaps should return the most specific caps it reasonably can, since this
|
|
* helps with autoplugging.
|
|
*
|
|
* Note that the return value from @getcaps is owned by the caller, so the
|
|
* caller should unref the caps after usage.
|
|
*/
|
|
void
|
|
gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_GETCAPSFUNC (pad) = getcaps;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getcapsfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (getcaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_acceptcaps_function:
|
|
* @pad: a #GstPad.
|
|
* @acceptcaps: the #GstPadAcceptCapsFunction to set.
|
|
*
|
|
* Sets the given acceptcaps function for the pad. The acceptcaps function
|
|
* will be called to check if the pad can accept the given caps. Setting the
|
|
* acceptcaps function to NULL restores the default behaviour of allowing
|
|
* any caps that matches the caps from gst_pad_get_caps().
|
|
*/
|
|
void
|
|
gst_pad_set_acceptcaps_function (GstPad * pad,
|
|
GstPadAcceptCapsFunction acceptcaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACCEPTCAPSFUNC (pad) = acceptcaps;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "acceptcapsfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (acceptcaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_fixatecaps_function:
|
|
* @pad: a #GstPad.
|
|
* @fixatecaps: the #GstPadFixateCapsFunction to set.
|
|
*
|
|
* Sets the given fixatecaps function for the pad. The fixatecaps function
|
|
* will be called whenever the default values for a GstCaps needs to be
|
|
* filled in.
|
|
*/
|
|
void
|
|
gst_pad_set_fixatecaps_function (GstPad * pad,
|
|
GstPadFixateCapsFunction fixatecaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_FIXATECAPSFUNC (pad) = fixatecaps;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "fixatecapsfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (fixatecaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_setcaps_function:
|
|
* @pad: a #GstPad.
|
|
* @setcaps: the #GstPadSetCapsFunction to set.
|
|
*
|
|
* Sets the given setcaps function for the pad. The setcaps function
|
|
* will be called whenever a buffer with a new media type is pushed or
|
|
* pulled from the pad. The pad/element needs to update its internal
|
|
* structures to process the new media type. If this new type is not
|
|
* acceptable, the setcaps function should return FALSE.
|
|
*/
|
|
void
|
|
gst_pad_set_setcaps_function (GstPad * pad, GstPadSetCapsFunction setcaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_SETCAPSFUNC (pad) = setcaps;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "setcapsfunc set to %s",
|
|
GST_DEBUG_FUNCPTR_NAME (setcaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_unlink:
|
|
* @srcpad: the source #GstPad to unlink.
|
|
* @sinkpad: the sink #GstPad to unlink.
|
|
*
|
|
* Unlinks the source pad from the sink pad. Will emit the #GstPad::unlinked
|
|
* signal on both pads.
|
|
*
|
|
* Returns: TRUE if the pads were unlinked. This function returns FALSE if
|
|
* the pads were not linked together.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstElement *parent = NULL;
|
|
gint i;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad), FALSE);
|
|
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)",
|
|
GST_DEBUG_PAD_NAME (srcpad), srcpad,
|
|
GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
|
|
|
|
/* We need to notify the parent before taking any pad locks as the bin in
|
|
* question might be waiting for a lock on the pad while holding its lock
|
|
* that our message will try to take. */
|
|
if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad)))) {
|
|
if (GST_IS_ELEMENT (parent)) {
|
|
gst_element_post_message (parent,
|
|
gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
|
|
GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, TRUE));
|
|
} else {
|
|
gst_object_unref (parent);
|
|
parent = NULL;
|
|
}
|
|
}
|
|
|
|
GST_OBJECT_LOCK (srcpad);
|
|
|
|
GST_OBJECT_LOCK (sinkpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_PEER (srcpad) != sinkpad))
|
|
goto not_linked_together;
|
|
|
|
if (GST_PAD_UNLINKFUNC (srcpad)) {
|
|
GST_PAD_UNLINKFUNC (srcpad) (srcpad);
|
|
}
|
|
if (GST_PAD_UNLINKFUNC (sinkpad)) {
|
|
GST_PAD_UNLINKFUNC (sinkpad) (sinkpad);
|
|
}
|
|
|
|
_priv_gst_pad_invalidate_cache (srcpad);
|
|
|
|
/* first clear peers */
|
|
GST_PAD_PEER (srcpad) = NULL;
|
|
GST_PAD_PEER (sinkpad) = NULL;
|
|
|
|
/* clear pending caps if any */
|
|
for (i = 0; i < GST_EVENT_MAX_STICKY; i++)
|
|
gst_event_replace (&sinkpad->priv->events[i].pending, NULL);
|
|
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
|
|
/* fire off a signal to each of the pads telling them
|
|
* that they've been unlinked */
|
|
g_signal_emit (srcpad, gst_pad_signals[PAD_UNLINKED], 0, sinkpad);
|
|
g_signal_emit (sinkpad, gst_pad_signals[PAD_UNLINKED], 0, srcpad);
|
|
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
result = TRUE;
|
|
|
|
done:
|
|
if (parent != NULL) {
|
|
gst_element_post_message (parent,
|
|
gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
|
|
GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, FALSE));
|
|
gst_object_unref (parent);
|
|
}
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
not_linked_together:
|
|
{
|
|
/* we do not emit a warning in this case because unlinking cannot
|
|
* be made MT safe.*/
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_is_linked:
|
|
* @pad: pad to check
|
|
*
|
|
* Checks if a @pad is linked to another pad or not.
|
|
*
|
|
* Returns: TRUE if the pad is linked, FALSE otherwise.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_is_linked (GstPad * pad)
|
|
{
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
result = (GST_PAD_PEER (pad) != NULL);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* get the caps from both pads and see if the intersection
|
|
* is not empty.
|
|
*
|
|
* This function should be called with the pad LOCK on both
|
|
* pads
|
|
*/
|
|
static gboolean
|
|
gst_pad_link_check_compatible_unlocked (GstPad * src, GstPad * sink,
|
|
GstPadLinkCheck flags)
|
|
{
|
|
GstCaps *srccaps = NULL;
|
|
GstCaps *sinkcaps = NULL;
|
|
gboolean compatible = FALSE;
|
|
|
|
if (!(flags & (GST_PAD_LINK_CHECK_CAPS | GST_PAD_LINK_CHECK_TEMPLATE_CAPS)))
|
|
return TRUE;
|
|
|
|
/* Doing the expensive caps checking takes priority over only checking the template caps */
|
|
if (flags & GST_PAD_LINK_CHECK_CAPS) {
|
|
srccaps = gst_pad_get_caps_unlocked (src, NULL);
|
|
sinkcaps = gst_pad_get_caps_unlocked (sink, NULL);
|
|
} else {
|
|
/* If one of the two pads doesn't have a template, consider the intersection
|
|
* as valid.*/
|
|
if (G_UNLIKELY ((GST_PAD_PAD_TEMPLATE (src) == NULL)
|
|
|| (GST_PAD_PAD_TEMPLATE (sink) == NULL))) {
|
|
compatible = TRUE;
|
|
goto done;
|
|
}
|
|
srccaps = gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (src)));
|
|
sinkcaps =
|
|
gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (sink)));
|
|
}
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, src, "src caps %" GST_PTR_FORMAT,
|
|
srccaps);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, sink, "sink caps %" GST_PTR_FORMAT,
|
|
sinkcaps);
|
|
|
|
/* if we have caps on both pads we can check the intersection. If one
|
|
* of the caps is NULL, we return TRUE. */
|
|
if (G_UNLIKELY (srccaps == NULL || sinkcaps == NULL)) {
|
|
if (srccaps)
|
|
gst_caps_unref (srccaps);
|
|
if (sinkcaps)
|
|
gst_caps_unref (sinkcaps);
|
|
goto done;
|
|
}
|
|
|
|
compatible = gst_caps_can_intersect (srccaps, sinkcaps);
|
|
gst_caps_unref (srccaps);
|
|
gst_caps_unref (sinkcaps);
|
|
|
|
done:
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible",
|
|
(compatible ? "" : "not"));
|
|
|
|
return compatible;
|
|
}
|
|
|
|
/* check if the grandparents of both pads are the same.
|
|
* This check is required so that we don't try to link
|
|
* pads from elements in different bins without ghostpads.
|
|
*
|
|
* The LOCK should be held on both pads
|
|
*/
|
|
static gboolean
|
|
gst_pad_link_check_hierarchy (GstPad * src, GstPad * sink)
|
|
{
|
|
GstObject *psrc, *psink;
|
|
|
|
psrc = GST_OBJECT_PARENT (src);
|
|
psink = GST_OBJECT_PARENT (sink);
|
|
|
|
/* if one of the pads has no parent, we allow the link */
|
|
if (G_UNLIKELY (psrc == NULL || psink == NULL))
|
|
goto no_parent;
|
|
|
|
/* only care about parents that are elements */
|
|
if (G_UNLIKELY (!GST_IS_ELEMENT (psrc) || !GST_IS_ELEMENT (psink)))
|
|
goto no_element_parent;
|
|
|
|
/* if the parents are the same, we have a loop */
|
|
if (G_UNLIKELY (psrc == psink))
|
|
goto same_parents;
|
|
|
|
/* if they both have a parent, we check the grandparents. We can not lock
|
|
* the parent because we hold on the child (pad) and the locking order is
|
|
* parent >> child. */
|
|
psrc = GST_OBJECT_PARENT (psrc);
|
|
psink = GST_OBJECT_PARENT (psink);
|
|
|
|
/* if they have grandparents but they are not the same */
|
|
if (G_UNLIKELY (psrc != psink))
|
|
goto wrong_grandparents;
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
no_parent:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"one of the pads has no parent %" GST_PTR_FORMAT " and %"
|
|
GST_PTR_FORMAT, psrc, psink);
|
|
return TRUE;
|
|
}
|
|
no_element_parent:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"one of the pads has no element parent %" GST_PTR_FORMAT " and %"
|
|
GST_PTR_FORMAT, psrc, psink);
|
|
return TRUE;
|
|
}
|
|
same_parents:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "pads have same parent %" GST_PTR_FORMAT,
|
|
psrc);
|
|
return FALSE;
|
|
}
|
|
wrong_grandparents:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"pads have different grandparents %" GST_PTR_FORMAT " and %"
|
|
GST_PTR_FORMAT, psrc, psink);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* FIXME leftover from an attempt at refactoring... */
|
|
/* call with the two pads unlocked, when this function returns GST_PAD_LINK_OK,
|
|
* the two pads will be locked in the srcpad, sinkpad order. */
|
|
static GstPadLinkReturn
|
|
gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
GST_OBJECT_LOCK (srcpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_PEER (srcpad) != NULL))
|
|
goto src_was_linked;
|
|
|
|
GST_OBJECT_LOCK (sinkpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_PEER (sinkpad) != NULL))
|
|
goto sink_was_linked;
|
|
|
|
/* check hierarchy, pads can only be linked if the grandparents
|
|
* are the same. */
|
|
if ((flags & GST_PAD_LINK_CHECK_HIERARCHY)
|
|
&& !gst_pad_link_check_hierarchy (srcpad, sinkpad))
|
|
goto wrong_hierarchy;
|
|
|
|
/* check pad caps for non-empty intersection */
|
|
if (!gst_pad_link_check_compatible_unlocked (srcpad, sinkpad, flags))
|
|
goto no_format;
|
|
|
|
/* FIXME check pad scheduling for non-empty intersection */
|
|
|
|
return GST_PAD_LINK_OK;
|
|
|
|
src_was_linked:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was already linked to %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad),
|
|
GST_DEBUG_PAD_NAME (GST_PAD_PEER (srcpad)));
|
|
/* we do not emit a warning in this case because unlinking cannot
|
|
* be made MT safe.*/
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WAS_LINKED;
|
|
}
|
|
sink_was_linked:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was already linked to %s:%s",
|
|
GST_DEBUG_PAD_NAME (sinkpad),
|
|
GST_DEBUG_PAD_NAME (GST_PAD_PEER (sinkpad)));
|
|
/* we do not emit a warning in this case because unlinking cannot
|
|
* be made MT safe.*/
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WAS_LINKED;
|
|
}
|
|
wrong_hierarchy:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "pads have wrong hierarchy");
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WRONG_HIERARCHY;
|
|
}
|
|
no_format:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible");
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_NOFORMAT;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_can_link:
|
|
* @srcpad: the source #GstPad.
|
|
* @sinkpad: the sink #GstPad.
|
|
*
|
|
* Checks if the source pad and the sink pad are compatible so they can be
|
|
* linked.
|
|
*
|
|
* Returns: TRUE if the pads can be linked.
|
|
*/
|
|
gboolean
|
|
gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
GstPadLinkReturn result;
|
|
|
|
/* generic checks */
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
|
|
|
|
GST_CAT_INFO (GST_CAT_PADS, "check if %s:%s can link with %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
/* gst_pad_link_prepare does everything for us, we only release the locks
|
|
* on the pads that it gets us. If this function returns !OK the locks are not
|
|
* taken anymore. */
|
|
result = gst_pad_link_prepare (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
|
|
if (result != GST_PAD_LINK_OK)
|
|
goto done;
|
|
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
|
|
done:
|
|
return result == GST_PAD_LINK_OK;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_link_full:
|
|
* @srcpad: the source #GstPad to link.
|
|
* @sinkpad: the sink #GstPad to link.
|
|
* @flags: the checks to validate when linking
|
|
*
|
|
* Links the source pad and the sink pad.
|
|
*
|
|
* This variant of #gst_pad_link provides a more granular control on the
|
|
* checks being done when linking. While providing some considerable speedups
|
|
* the caller of this method must be aware that wrong usage of those flags
|
|
* can cause severe issues. Refer to the documentation of #GstPadLinkCheck
|
|
* for more information.
|
|
*
|
|
* MT Safe.
|
|
*
|
|
* Returns: A result code indicating if the connection worked or
|
|
* what went wrong.
|
|
*
|
|
* Since: 0.10.30
|
|
*/
|
|
GstPadLinkReturn
|
|
gst_pad_link_full (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
|
|
{
|
|
GstPadLinkReturn result;
|
|
GstElement *parent;
|
|
guint i;
|
|
gboolean pending;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), GST_PAD_LINK_WRONG_DIRECTION);
|
|
g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad),
|
|
GST_PAD_LINK_WRONG_DIRECTION);
|
|
|
|
/* Notify the parent early. See gst_pad_unlink for details. */
|
|
if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad)))) {
|
|
if (GST_IS_ELEMENT (parent)) {
|
|
gst_element_post_message (parent,
|
|
gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
|
|
GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, TRUE));
|
|
} else {
|
|
gst_object_unref (parent);
|
|
parent = NULL;
|
|
}
|
|
}
|
|
|
|
/* prepare will also lock the two pads */
|
|
result = gst_pad_link_prepare (srcpad, sinkpad, flags);
|
|
|
|
if (result != GST_PAD_LINK_OK)
|
|
goto done;
|
|
|
|
/* must set peers before calling the link function */
|
|
GST_PAD_PEER (srcpad) = sinkpad;
|
|
GST_PAD_PEER (sinkpad) = srcpad;
|
|
|
|
/* make sure we push the events from the source to this new peer, for this we
|
|
* copy the events on the sinkpad and mark EVENTS_PENDING */
|
|
pending = FALSE;
|
|
for (i = 0; i < GST_EVENT_MAX_STICKY; i++)
|
|
pending |= replace_event (srcpad, sinkpad, i);
|
|
|
|
/* we had some new pending events, set our flag */
|
|
if (pending)
|
|
GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_NEED_EVENTS);
|
|
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
|
|
/* FIXME released the locks here, concurrent thread might link
|
|
* something else. */
|
|
if (GST_PAD_LINKFUNC (srcpad)) {
|
|
/* this one will call the peer link function */
|
|
result = GST_PAD_LINKFUNC (srcpad) (srcpad, sinkpad);
|
|
} else if (GST_PAD_LINKFUNC (sinkpad)) {
|
|
/* if no source link function, we need to call the sink link
|
|
* function ourselves. */
|
|
result = GST_PAD_LINKFUNC (sinkpad) (sinkpad, srcpad);
|
|
} else {
|
|
result = GST_PAD_LINK_OK;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (srcpad);
|
|
GST_OBJECT_LOCK (sinkpad);
|
|
|
|
if (result == GST_PAD_LINK_OK) {
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
|
|
/* fire off a signal to each of the pads telling them
|
|
* that they've been linked */
|
|
g_signal_emit (srcpad, gst_pad_signals[PAD_LINKED], 0, sinkpad);
|
|
g_signal_emit (sinkpad, gst_pad_signals[PAD_LINKED], 0, srcpad);
|
|
|
|
GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
gst_pad_send_event (srcpad, gst_event_new_reconfigure ());
|
|
} else {
|
|
GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
GST_PAD_PEER (srcpad) = NULL;
|
|
GST_PAD_PEER (sinkpad) = NULL;
|
|
|
|
GST_OBJECT_UNLOCK (sinkpad);
|
|
GST_OBJECT_UNLOCK (srcpad);
|
|
}
|
|
|
|
done:
|
|
if (parent) {
|
|
gst_element_post_message (parent,
|
|
gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
|
|
GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, FALSE));
|
|
gst_object_unref (parent);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_link:
|
|
* @srcpad: the source #GstPad to link.
|
|
* @sinkpad: the sink #GstPad to link.
|
|
*
|
|
* Links the source pad and the sink pad.
|
|
*
|
|
* Returns: A result code indicating if the connection worked or
|
|
* what went wrong.
|
|
*
|
|
* MT Safe.
|
|
*/
|
|
GstPadLinkReturn
|
|
gst_pad_link (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
return gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
|
|
}
|
|
|
|
static void
|
|
gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ)
|
|
{
|
|
GstPadTemplate **template_p;
|
|
|
|
/* this function would need checks if it weren't static */
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
template_p = &pad->padtemplate;
|
|
gst_object_replace ((GstObject **) template_p, (GstObject *) templ);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (templ)
|
|
gst_pad_template_pad_created (templ, pad);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_pad_template:
|
|
* @pad: a #GstPad.
|
|
*
|
|
* Gets the template for @pad.
|
|
*
|
|
* Returns: (transfer full): the #GstPadTemplate from which this pad was
|
|
* instantiated, or %NULL if this pad has no template. Unref after
|
|
* usage.
|
|
*/
|
|
GstPadTemplate *
|
|
gst_pad_get_pad_template (GstPad * pad)
|
|
{
|
|
GstPadTemplate *templ;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
templ = GST_PAD_PAD_TEMPLATE (pad);
|
|
|
|
return (templ ? gst_object_ref (templ) : NULL);
|
|
}
|
|
|
|
/* should be called with the pad LOCK held */
|
|
/* refs the caps, so caller is responsible for getting it unreffed */
|
|
static GstCaps *
|
|
gst_pad_get_caps_unlocked (GstPad * pad, GstCaps * filter)
|
|
{
|
|
GstCaps *result = NULL;
|
|
GstPadTemplate *templ;
|
|
gboolean fixed_caps;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "get pad caps");
|
|
|
|
fixed_caps = GST_PAD_IS_FIXED_CAPS (pad);
|
|
|
|
if (!fixed_caps && GST_PAD_GETCAPSFUNC (pad)) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"dispatching to pad getcaps function with "
|
|
"filter %" GST_PTR_FORMAT, filter);
|
|
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_IN_GETCAPS);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
result = GST_PAD_GETCAPSFUNC (pad) (pad, filter);
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_IN_GETCAPS);
|
|
|
|
if (result == NULL) {
|
|
g_critical ("pad %s:%s returned NULL caps from getcaps function",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"pad getcaps returned %" GST_PTR_FORMAT, result);
|
|
#ifndef G_DISABLE_ASSERT
|
|
/* check that the returned caps are a real subset of the template caps */
|
|
if (GST_PAD_PAD_TEMPLATE (pad)) {
|
|
const GstCaps *templ_caps =
|
|
GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad));
|
|
if (!gst_caps_is_subset (result, templ_caps)) {
|
|
GstCaps *temp;
|
|
|
|
GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, pad,
|
|
"pad returned caps %" GST_PTR_FORMAT
|
|
" which are not a real subset of its template caps %"
|
|
GST_PTR_FORMAT, result, templ_caps);
|
|
g_warning
|
|
("pad %s:%s returned caps which are not a real "
|
|
"subset of its template caps", GST_DEBUG_PAD_NAME (pad));
|
|
temp = gst_caps_intersect (templ_caps, result);
|
|
gst_caps_unref (result);
|
|
result = temp;
|
|
}
|
|
}
|
|
if (filter) {
|
|
if (!gst_caps_is_subset (result, filter)) {
|
|
GstCaps *temp;
|
|
|
|
GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, pad,
|
|
"pad returned caps %" GST_PTR_FORMAT
|
|
" which are not a real subset of the filter caps %"
|
|
GST_PTR_FORMAT, result, filter);
|
|
g_warning ("pad %s:%s returned caps which are not a real "
|
|
"subset of the filter caps", GST_DEBUG_PAD_NAME (pad));
|
|
/* FIXME: Order? But shouldn't happen anyway... */
|
|
temp =
|
|
gst_caps_intersect_full (filter, result,
|
|
GST_CAPS_INTERSECT_FIRST);
|
|
gst_caps_unref (result);
|
|
result = temp;
|
|
}
|
|
}
|
|
#endif
|
|
goto done;
|
|
}
|
|
}
|
|
if (fixed_caps && (result = get_pad_caps (pad))) {
|
|
if (filter) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"using pad caps %p %" GST_PTR_FORMAT " with filter %p %"
|
|
GST_PTR_FORMAT, result, result, filter, filter);
|
|
result =
|
|
gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT,
|
|
result);
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"using pad caps %p %" GST_PTR_FORMAT, result, result);
|
|
result = gst_caps_ref (result);
|
|
}
|
|
goto done;
|
|
}
|
|
if ((templ = GST_PAD_PAD_TEMPLATE (pad))) {
|
|
result = GST_PAD_TEMPLATE_CAPS (templ);
|
|
|
|
if (filter) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"using pad template %p with caps %p %" GST_PTR_FORMAT
|
|
" and filter %p %" GST_PTR_FORMAT, templ, result, result, filter,
|
|
filter);
|
|
result =
|
|
gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT,
|
|
result);
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"using pad template %p with caps %p %" GST_PTR_FORMAT, templ, result,
|
|
result);
|
|
result = gst_caps_ref (result);
|
|
}
|
|
|
|
goto done;
|
|
}
|
|
if (!fixed_caps && (result = get_pad_caps (pad))) {
|
|
if (filter) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"using pad caps %p %" GST_PTR_FORMAT " with filter %p %"
|
|
GST_PTR_FORMAT, result, result, filter, filter);
|
|
result =
|
|
gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT,
|
|
result);
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"using pad caps %p %" GST_PTR_FORMAT, result, result);
|
|
result = gst_caps_ref (result);
|
|
}
|
|
|
|
goto done;
|
|
}
|
|
|
|
/* this almost never happens */
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "pad has no caps");
|
|
result = gst_caps_new_empty ();
|
|
|
|
done:
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_has_current_caps:
|
|
* @pad: a #GstPad to check
|
|
*
|
|
* Check if @pad has caps set on it with gst_pad_set_caps().
|
|
*
|
|
* Returns: TRUE when @pad has caps associated with it.
|
|
*/
|
|
gboolean
|
|
gst_pad_has_current_caps (GstPad * pad)
|
|
{
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "check current pad caps");
|
|
result = (get_pad_caps (pad) != NULL);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_current_caps:
|
|
* @pad: a #GstPad to get the current capabilities of.
|
|
*
|
|
* Gets the capabilities currently configured on @pad with the last call to
|
|
* gst_pad_set_caps().
|
|
*
|
|
* Returns: the current caps of the pad with incremented ref-count.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_current_caps (GstPad * pad)
|
|
{
|
|
GstCaps *result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
if ((result = get_pad_caps (pad)))
|
|
gst_caps_ref (result);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"get current pad caps %" GST_PTR_FORMAT, result);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_caps:
|
|
* @pad: a #GstPad to get the capabilities of.
|
|
* @filter: suggested #GstCaps.
|
|
*
|
|
* Gets the capabilities this pad can produce or consume.
|
|
* Note that this method doesn't necessarily return the caps set by
|
|
* gst_pad_set_caps() - use gst_pad_get_current_caps() for that instead.
|
|
* gst_pad_get_caps returns all possible caps a pad can operate with, using
|
|
* the pad's get_caps function;
|
|
* this returns the pad template caps if not explicitly set.
|
|
*
|
|
* When called on sinkpads @filter contains the caps that
|
|
* upstream could produce in the order preferred by upstream. When
|
|
* called on srcpads @filter contains the caps accepted by
|
|
* downstream in the preffered order. @filter might be %NULL but
|
|
* if it is not %NULL the returned caps will be a subset of @filter.
|
|
*
|
|
* Note that this function does not return writable #GstCaps, use
|
|
* gst_caps_make_writable() before modifying the caps.
|
|
*
|
|
* Returns: the caps of the pad with incremented ref-count.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_caps (GstPad * pad, GstCaps * filter)
|
|
{
|
|
GstCaps *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), NULL);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "get pad caps");
|
|
|
|
result = gst_pad_get_caps_unlocked (pad, filter);
|
|
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_pad_peer_get_caps:
|
|
* @pad: a #GstPad to get the capabilities of.
|
|
* @filter: a #GstCaps filter.
|
|
*
|
|
* Gets the capabilities of the peer connected to this pad. Similar to
|
|
* gst_pad_get_caps().
|
|
*
|
|
* When called on srcpads @filter contains the caps that
|
|
* upstream could produce in the order preferred by upstream. When
|
|
* called on sinkpads @filter contains the caps accepted by
|
|
* downstream in the preffered order. @filter might be %NULL but
|
|
* if it is not %NULL the returned caps will be a subset of @filter.
|
|
*
|
|
* Returns: the caps of the peer pad with incremented ref-count. This function
|
|
* returns %NULL when there is no peer pad.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_peer_get_caps (GstPad * pad, GstCaps * filter)
|
|
{
|
|
GstPad *peerpad;
|
|
GstCaps *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), NULL);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "get peer caps");
|
|
|
|
peerpad = GST_PAD_PEER (pad);
|
|
if (G_UNLIKELY (peerpad == NULL))
|
|
goto no_peer;
|
|
|
|
gst_object_ref (peerpad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
result = gst_pad_get_caps (peerpad, filter);
|
|
|
|
gst_object_unref (peerpad);
|
|
|
|
return result;
|
|
|
|
no_peer:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
fixate_value (GValue * dest, const GValue * src)
|
|
{
|
|
if (G_VALUE_TYPE (src) == GST_TYPE_INT_RANGE) {
|
|
g_value_init (dest, G_TYPE_INT);
|
|
g_value_set_int (dest, gst_value_get_int_range_min (src));
|
|
} else if (G_VALUE_TYPE (src) == GST_TYPE_DOUBLE_RANGE) {
|
|
g_value_init (dest, G_TYPE_DOUBLE);
|
|
g_value_set_double (dest, gst_value_get_double_range_min (src));
|
|
} else if (G_VALUE_TYPE (src) == GST_TYPE_FRACTION_RANGE) {
|
|
gst_value_init_and_copy (dest, gst_value_get_fraction_range_min (src));
|
|
} else if (G_VALUE_TYPE (src) == GST_TYPE_LIST) {
|
|
GValue temp = { 0 };
|
|
|
|
/* list could be empty */
|
|
if (gst_value_list_get_size (src) <= 0)
|
|
return FALSE;
|
|
|
|
gst_value_init_and_copy (&temp, gst_value_list_get_value (src, 0));
|
|
|
|
if (!fixate_value (dest, &temp))
|
|
gst_value_init_and_copy (dest, &temp);
|
|
g_value_unset (&temp);
|
|
} else if (G_VALUE_TYPE (src) == GST_TYPE_ARRAY) {
|
|
gboolean res = FALSE;
|
|
guint n, len;
|
|
|
|
len = gst_value_array_get_size (src);
|
|
g_value_init (dest, GST_TYPE_ARRAY);
|
|
for (n = 0; n < len; n++) {
|
|
GValue kid = { 0 };
|
|
const GValue *orig_kid = gst_value_array_get_value (src, n);
|
|
|
|
if (!fixate_value (&kid, orig_kid))
|
|
gst_value_init_and_copy (&kid, orig_kid);
|
|
else
|
|
res = TRUE;
|
|
gst_value_array_append_value (dest, &kid);
|
|
g_value_unset (&kid);
|
|
}
|
|
|
|
if (!res)
|
|
g_value_unset (dest);
|
|
|
|
return res;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_default_fixate (GQuark field_id, const GValue * value, gpointer data)
|
|
{
|
|
GstStructure *s = data;
|
|
GValue v = { 0 };
|
|
|
|
if (fixate_value (&v, value)) {
|
|
gst_structure_id_set_value (s, field_id, &v);
|
|
g_value_unset (&v);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_fixate_caps:
|
|
* @pad: a #GstPad to fixate
|
|
* @caps: the #GstCaps to fixate
|
|
*
|
|
* Fixate a caps on the given pad. Modifies the caps in place, so you should
|
|
* make sure that the caps are actually writable (see gst_caps_make_writable()).
|
|
*/
|
|
void
|
|
gst_pad_fixate_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPadFixateCapsFunction fixatefunc;
|
|
GstStructure *s;
|
|
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (caps != NULL);
|
|
g_return_if_fail (!gst_caps_is_empty (caps));
|
|
g_return_if_fail (!gst_caps_is_any (caps));
|
|
|
|
if (gst_caps_is_fixed (caps) || gst_caps_is_any (caps))
|
|
return;
|
|
|
|
fixatefunc = GST_PAD_FIXATECAPSFUNC (pad);
|
|
if (fixatefunc) {
|
|
fixatefunc (pad, caps);
|
|
}
|
|
|
|
/* default fixation */
|
|
gst_caps_truncate (caps);
|
|
s = gst_caps_get_structure (caps, 0);
|
|
gst_structure_foreach (s, gst_pad_default_fixate, s);
|
|
}
|
|
|
|
/* Default accept caps implementation just checks against
|
|
* against the allowed caps for the pad */
|
|
static gboolean
|
|
gst_pad_acceptcaps_default (GstPad * pad, GstCaps * caps)
|
|
{
|
|
/* get the caps and see if it intersects to something not empty */
|
|
GstCaps *allowed;
|
|
gboolean result = FALSE;
|
|
|
|
GST_DEBUG_OBJECT (pad, "caps %" GST_PTR_FORMAT, caps);
|
|
|
|
allowed = gst_pad_get_caps (pad, NULL);
|
|
if (!allowed)
|
|
goto nothing_allowed;
|
|
|
|
GST_DEBUG_OBJECT (pad, "allowed caps %" GST_PTR_FORMAT, allowed);
|
|
|
|
result = gst_caps_can_intersect (allowed, caps);
|
|
|
|
gst_caps_unref (allowed);
|
|
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
nothing_allowed:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "no caps allowed on the pad");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_accept_caps:
|
|
* @pad: a #GstPad to check
|
|
* @caps: a #GstCaps to check on the pad
|
|
*
|
|
* Check if the given pad accepts the caps.
|
|
*
|
|
* Returns: TRUE if the pad can accept the caps.
|
|
*/
|
|
gboolean
|
|
gst_pad_accept_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
gboolean result;
|
|
GstPadAcceptCapsFunction acceptfunc;
|
|
#if 0
|
|
GstCaps *existing = NULL;
|
|
#endif
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
/* any pad can be unnegotiated */
|
|
if (caps == NULL)
|
|
return TRUE;
|
|
|
|
/* lock for checking the existing caps */
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "accept caps of %p", caps);
|
|
#if 0
|
|
/* The current caps on a pad are trivially acceptable */
|
|
if (G_LIKELY ((existing = GST_PAD_CAPS (pad)))) {
|
|
if (caps == existing || gst_caps_is_equal (caps, existing))
|
|
goto is_same_caps;
|
|
}
|
|
#endif
|
|
acceptfunc = GST_PAD_ACCEPTCAPSFUNC (pad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (G_LIKELY (acceptfunc)) {
|
|
/* we can call the function */
|
|
result = acceptfunc (pad, caps);
|
|
GST_DEBUG_OBJECT (pad, "acceptfunc returned %d", result);
|
|
} else {
|
|
/* Only null if the element explicitly unset it */
|
|
result = gst_pad_acceptcaps_default (pad, caps);
|
|
GST_DEBUG_OBJECT (pad, "default acceptcaps returned %d", result);
|
|
}
|
|
return result;
|
|
|
|
#if 0
|
|
is_same_caps:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "pad had same caps");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* gst_pad_peer_accept_caps:
|
|
* @pad: a #GstPad to check the peer of
|
|
* @caps: a #GstCaps to check on the pad
|
|
*
|
|
* Check if the peer of @pad accepts @caps. If @pad has no peer, this function
|
|
* returns TRUE.
|
|
*
|
|
* Returns: TRUE if the peer of @pad can accept the caps or @pad has no peer.
|
|
*/
|
|
gboolean
|
|
gst_pad_peer_accept_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPad *peerpad;
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "peer accept caps of (%p)", pad);
|
|
|
|
peerpad = GST_PAD_PEER (pad);
|
|
if (G_UNLIKELY (peerpad == NULL))
|
|
goto no_peer;
|
|
|
|
gst_object_ref (peerpad);
|
|
/* release lock before calling external methods but keep ref to pad */
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
result = gst_pad_accept_caps (peerpad, caps);
|
|
|
|
gst_object_unref (peerpad);
|
|
|
|
return result;
|
|
|
|
no_peer:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_caps:
|
|
* @pad: a #GstPad to set the capabilities of.
|
|
* @caps: (transfer none): a #GstCaps to set.
|
|
*
|
|
* Sets the capabilities of this pad. The caps must be fixed. Any previous
|
|
* caps on the pad will be unreffed. This function refs the caps so you should
|
|
* unref if as soon as you don't need it anymore.
|
|
* It is possible to set NULL caps, which will make the pad unnegotiated
|
|
* again.
|
|
*
|
|
* Returns: TRUE if the caps could be set. FALSE if the caps were not fixed
|
|
* or bad parameters were provided to this function.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstEvent *event;
|
|
gboolean res = TRUE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (caps != NULL && gst_caps_is_fixed (caps), FALSE);
|
|
|
|
event = gst_event_new_caps (caps);
|
|
|
|
if (GST_PAD_IS_SRC (pad))
|
|
gst_pad_push_event (pad, event);
|
|
else
|
|
res = gst_pad_send_event (pad, event);
|
|
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_call_setcaps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPadSetCapsFunction setcaps;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
setcaps = GST_PAD_SETCAPSFUNC (pad);
|
|
|
|
/* call setcaps function to configure the pad only if the
|
|
* caps is not NULL */
|
|
if (setcaps != NULL) {
|
|
if (!GST_PAD_IS_IN_SETCAPS (pad)) {
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_IN_SETCAPS);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
if (!setcaps (pad, caps))
|
|
goto setcaps_failed;
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_IN_SETCAPS);
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "pad was dispatching");
|
|
}
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
setcaps_failed:
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
do_event_function (GstPad * pad, GstEvent * event,
|
|
GstPadEventFunction eventfunc)
|
|
{
|
|
gboolean result = TRUE;
|
|
GstCaps *caps, *templ;
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
/* backwards compatibility mode for caps */
|
|
gst_event_parse_caps (event, &caps);
|
|
|
|
/* See if pad accepts the caps */
|
|
templ = gst_pad_get_pad_template_caps (pad);
|
|
if (!gst_caps_can_intersect (caps, templ))
|
|
goto not_accepted;
|
|
|
|
if (!gst_pad_call_setcaps (pad, caps))
|
|
goto not_accepted;
|
|
|
|
gst_caps_unref (templ);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (pad, "calling event function with event %p", event);
|
|
result = eventfunc (pad, event);
|
|
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
not_accepted:
|
|
{
|
|
gst_caps_unref (templ);
|
|
gst_event_unref (event);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"caps %" GST_PTR_FORMAT " not accepted", caps);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* function to send all pending events on the sinkpad to the event
|
|
* function and collect the results. This function should be called with
|
|
* the object lock. The object lock might be released by this function.
|
|
*/
|
|
static GstFlowReturn
|
|
gst_pad_update_events (GstPad * pad)
|
|
{
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
guint i;
|
|
GstPadEventFunction eventfunc;
|
|
GstEvent *event;
|
|
|
|
if (G_UNLIKELY ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
restart:
|
|
for (i = 0; i < GST_EVENT_MAX_STICKY; i++) {
|
|
gboolean res;
|
|
PadEvent *ev;
|
|
|
|
ev = &pad->priv->events[i];
|
|
|
|
/* skip without pending event */
|
|
if ((event = ev->pending) == NULL)
|
|
continue;
|
|
|
|
gst_event_ref (event);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
res = do_event_function (pad, event, eventfunc);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
/* things could have changed while we release the lock, check if we still
|
|
* are handling the same event, if we don't something changed and we have
|
|
* to try again. FIXME. we need a cookie here. */
|
|
if (event != ev->pending) {
|
|
GST_DEBUG_OBJECT (pad, "events changed, restarting");
|
|
goto restart;
|
|
}
|
|
|
|
/* remove the event from the pending entry in all cases */
|
|
ev->pending = NULL;
|
|
|
|
if (res) {
|
|
/* make the event active */
|
|
if (ev->event)
|
|
gst_event_unref (ev->event);
|
|
ev->event = event;
|
|
} else {
|
|
gst_event_unref (event);
|
|
ret = GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
/* when we get here all events were successfully updated. */
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
no_function:
|
|
{
|
|
g_warning ("pad %s:%s has no event handler, file a bug.",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
return GST_FLOW_NOT_SUPPORTED;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_pad_template_caps:
|
|
* @pad: a #GstPad to get the template capabilities from.
|
|
*
|
|
* Gets the capabilities for @pad's template.
|
|
*
|
|
* Returns: (transfer full): the #GstCaps of this pad template.
|
|
* Unref after usage.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_pad_template_caps (GstPad * pad)
|
|
{
|
|
static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY");
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
if (GST_PAD_PAD_TEMPLATE (pad))
|
|
return gst_pad_template_get_caps (GST_PAD_PAD_TEMPLATE (pad));
|
|
|
|
return gst_static_caps_get (&anycaps);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_peer:
|
|
* @pad: a #GstPad to get the peer of.
|
|
*
|
|
* Gets the peer of @pad. This function refs the peer pad so
|
|
* you need to unref it after use.
|
|
*
|
|
* Returns: (transfer full): the peer #GstPad. Unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPad *
|
|
gst_pad_get_peer (GstPad * pad)
|
|
{
|
|
GstPad *result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
result = GST_PAD_PEER (pad);
|
|
if (result)
|
|
gst_object_ref (result);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_allowed_caps:
|
|
* @pad: a #GstPad.
|
|
*
|
|
* Gets the capabilities of the allowed media types that can flow through
|
|
* @pad and its peer.
|
|
*
|
|
* The allowed capabilities is calculated as the intersection of the results of
|
|
* calling gst_pad_get_caps() on @pad and its peer. The caller owns a reference
|
|
* on the resulting caps.
|
|
*
|
|
* Returns: (transfer full): the allowed #GstCaps of the pad link. Unref the
|
|
* caps when you no longer need it. This function returns NULL when @pad
|
|
* has no peer.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_allowed_caps (GstPad * pad)
|
|
{
|
|
GstCaps *mycaps;
|
|
GstCaps *caps;
|
|
GstCaps *peercaps;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
peer = GST_PAD_PEER (pad);
|
|
if (G_UNLIKELY (peer == NULL))
|
|
goto no_peer;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "getting allowed caps");
|
|
|
|
gst_object_ref (peer);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
mycaps = gst_pad_get_caps (pad, NULL);
|
|
|
|
peercaps = gst_pad_get_caps (peer, NULL);
|
|
gst_object_unref (peer);
|
|
|
|
caps = gst_caps_intersect (mycaps, peercaps);
|
|
gst_caps_unref (peercaps);
|
|
gst_caps_unref (mycaps);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "allowed caps %" GST_PTR_FORMAT,
|
|
caps);
|
|
|
|
return caps;
|
|
|
|
no_peer:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "no peer");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_negotiated_caps:
|
|
* @pad: a #GstPad.
|
|
*
|
|
* Gets the capabilities of the media type that currently flows through @pad
|
|
* and its peer.
|
|
*
|
|
* This function can be used on both src and sinkpads. Note that srcpads are
|
|
* always negotiated before sinkpads so it is possible that the negotiated caps
|
|
* on the srcpad do not match the negotiated caps of the peer.
|
|
*
|
|
* Returns: (transfer full): the negotiated #GstCaps of the pad link. Unref
|
|
* the caps when you no longer need it. This function returns NULL when
|
|
* the @pad has no peer or is not negotiated yet.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_negotiated_caps (GstPad * pad)
|
|
{
|
|
GstCaps *caps = NULL;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto no_peer;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "getting negotiated caps");
|
|
|
|
if ((caps = get_pad_caps (pad)))
|
|
gst_caps_ref (caps);
|
|
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "negotiated caps %" GST_PTR_FORMAT,
|
|
caps);
|
|
|
|
return caps;
|
|
|
|
no_peer:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "no peer");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_iterate_internal_links_default:
|
|
* @pad: the #GstPad to get the internal links of.
|
|
*
|
|
* Iterate the list of pads to which the given pad is linked to inside of
|
|
* the parent element.
|
|
* This is the default handler, and thus returns an iterator of all of the
|
|
* pads inside the parent element with opposite direction.
|
|
*
|
|
* The caller must free this iterator after use with gst_iterator_free().
|
|
*
|
|
* Returns: a #GstIterator of #GstPad, or NULL if @pad has no parent. Unref each
|
|
* returned pad with gst_object_unref().
|
|
*
|
|
* Since: 0.10.21
|
|
*/
|
|
GstIterator *
|
|
gst_pad_iterate_internal_links_default (GstPad * pad)
|
|
{
|
|
GstIterator *res;
|
|
GList **padlist;
|
|
guint32 *cookie;
|
|
GMutex *lock;
|
|
gpointer owner;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
{
|
|
GstElement *parent;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
parent = GST_PAD_PARENT (pad);
|
|
if (!parent || !GST_IS_ELEMENT (parent))
|
|
goto no_parent;
|
|
|
|
gst_object_ref (parent);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (pad->direction == GST_PAD_SRC)
|
|
padlist = &parent->sinkpads;
|
|
else
|
|
padlist = &parent->srcpads;
|
|
|
|
GST_DEBUG_OBJECT (pad, "Making iterator");
|
|
|
|
cookie = &parent->pads_cookie;
|
|
owner = parent;
|
|
lock = GST_OBJECT_GET_LOCK (parent);
|
|
}
|
|
|
|
res = gst_iterator_new_list (GST_TYPE_PAD,
|
|
lock, cookie, padlist, (GObject *) owner, NULL);
|
|
|
|
gst_object_unref (owner);
|
|
|
|
return res;
|
|
|
|
/* ERRORS */
|
|
no_parent:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_DEBUG_OBJECT (pad, "no parent element");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_iterate_internal_links:
|
|
* @pad: the GstPad to get the internal links of.
|
|
*
|
|
* Gets an iterator for the pads to which the given pad is linked to inside
|
|
* of the parent element.
|
|
*
|
|
* Each #GstPad element yielded by the iterator will have its refcount increased,
|
|
* so unref after use.
|
|
*
|
|
* Free-function: gst_iterator_free
|
|
*
|
|
* Returns: (transfer full): a new #GstIterator of #GstPad or %NULL when the
|
|
* pad does not have an iterator function configured. Use
|
|
* gst_iterator_free() after usage.
|
|
*
|
|
* Since: 0.10.21
|
|
*/
|
|
GstIterator *
|
|
gst_pad_iterate_internal_links (GstPad * pad)
|
|
{
|
|
GstIterator *res = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
if (GST_PAD_ITERINTLINKFUNC (pad))
|
|
res = GST_PAD_ITERINTLINKFUNC (pad) (pad);
|
|
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_event_default_dispatch (GstPad * pad, GstEvent * event)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstIterator *iter;
|
|
gboolean done = FALSE;
|
|
GValue item = { 0, };
|
|
GstPad *eventpad;
|
|
GList *pushed_pads = NULL;
|
|
|
|
GST_INFO_OBJECT (pad, "Sending event %p (%s) to all internally linked pads",
|
|
event, GST_EVENT_TYPE_NAME (event));
|
|
|
|
iter = gst_pad_iterate_internal_links (pad);
|
|
|
|
if (!iter)
|
|
goto no_iter;
|
|
|
|
while (!done) {
|
|
switch (gst_iterator_next (iter, &item)) {
|
|
case GST_ITERATOR_OK:
|
|
eventpad = g_value_get_object (&item);
|
|
|
|
/* if already pushed, skip */
|
|
if (g_list_find (pushed_pads, eventpad)) {
|
|
g_value_reset (&item);
|
|
break;
|
|
}
|
|
|
|
if (GST_PAD_IS_SRC (eventpad)) {
|
|
/* for each pad we send to, we should ref the event; it's up
|
|
* to downstream to unref again when handled. */
|
|
GST_LOG_OBJECT (pad, "Reffing and sending event %p (%s) to %s:%s",
|
|
event, GST_EVENT_TYPE_NAME (event),
|
|
GST_DEBUG_PAD_NAME (eventpad));
|
|
gst_event_ref (event);
|
|
result |= gst_pad_push_event (eventpad, event);
|
|
} else {
|
|
/* we only send the event on one pad, multi-sinkpad elements
|
|
* should implement a handler */
|
|
GST_LOG_OBJECT (pad, "sending event %p (%s) to one sink pad %s:%s",
|
|
event, GST_EVENT_TYPE_NAME (event),
|
|
GST_DEBUG_PAD_NAME (eventpad));
|
|
result = gst_pad_push_event (eventpad, event);
|
|
done = TRUE;
|
|
event = NULL;
|
|
}
|
|
|
|
pushed_pads = g_list_prepend (pushed_pads, eventpad);
|
|
|
|
g_value_reset (&item);
|
|
break;
|
|
case GST_ITERATOR_RESYNC:
|
|
/* We don't reset the result here because we don't push the event
|
|
* again on pads that got the event already and because we need
|
|
* to consider the result of the previous pushes */
|
|
gst_iterator_resync (iter);
|
|
break;
|
|
case GST_ITERATOR_ERROR:
|
|
GST_ERROR_OBJECT (pad, "Could not iterate over internally linked pads");
|
|
done = TRUE;
|
|
break;
|
|
case GST_ITERATOR_DONE:
|
|
done = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
g_value_unset (&item);
|
|
gst_iterator_free (iter);
|
|
|
|
no_iter:
|
|
|
|
/* If this is a sinkpad and we don't have pads to send the event to, we
|
|
* return TRUE. This is so that when using the default handler on a sink
|
|
* element, we don't fail to push it. */
|
|
if (!pushed_pads)
|
|
result = GST_PAD_IS_SINK (pad);
|
|
|
|
g_list_free (pushed_pads);
|
|
|
|
/* we handled the incoming event so we unref once */
|
|
if (event) {
|
|
GST_LOG_OBJECT (pad, "handled event %p, unreffing", event);
|
|
gst_event_unref (event);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_event_default:
|
|
* @pad: a #GstPad to call the default event handler on.
|
|
* @event: (transfer full): the #GstEvent to handle.
|
|
*
|
|
* Invokes the default event handler for the given pad. End-of-stream and
|
|
* discontinuity events are handled specially, and then the event is sent to all
|
|
* pads internally linked to @pad. Note that if there are many possible sink
|
|
* pads that are internally linked to @pad, only one will be sent an event.
|
|
* Multi-sinkpad elements should implement custom event handlers.
|
|
*
|
|
* Returns: TRUE if the event was sent succesfully.
|
|
*/
|
|
gboolean
|
|
gst_pad_event_default (GstPad * pad, GstEvent * event)
|
|
{
|
|
gboolean result = TRUE, forward = TRUE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
GST_LOG_OBJECT (pad, "default event handler");
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "pausing task because of eos");
|
|
gst_pad_pause_task (pad);
|
|
break;
|
|
}
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
/* don't forward by default */
|
|
forward = FALSE;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (forward)
|
|
result = gst_pad_event_default_dispatch (pad, event);
|
|
else
|
|
gst_event_unref (event);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_dispatcher:
|
|
* @pad: a #GstPad to dispatch.
|
|
* @dispatch: the #GstPadDispatcherFunction to call.
|
|
* @data: (closure): gpointer user data passed to the dispatcher function.
|
|
*
|
|
* Invokes the given dispatcher function on each respective peer of
|
|
* all pads that are internally linked to the given pad.
|
|
* The GstPadDispatcherFunction should return TRUE when no further pads
|
|
* need to be processed.
|
|
*
|
|
* Returns: TRUE if one of the dispatcher functions returned TRUE.
|
|
*/
|
|
gboolean
|
|
gst_pad_dispatcher (GstPad * pad, GstPadDispatcherFunction dispatch,
|
|
gpointer data)
|
|
{
|
|
gboolean res = FALSE;
|
|
GstIterator *iter = NULL;
|
|
gboolean done = FALSE;
|
|
GValue item = { 0, };
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (dispatch != NULL, FALSE);
|
|
|
|
iter = gst_pad_iterate_internal_links (pad);
|
|
|
|
if (!iter)
|
|
goto no_iter;
|
|
|
|
while (!done) {
|
|
switch (gst_iterator_next (iter, &item)) {
|
|
case GST_ITERATOR_OK:
|
|
{
|
|
GstPad *int_pad = g_value_get_object (&item);
|
|
GstPad *int_peer = gst_pad_get_peer (int_pad);
|
|
|
|
if (int_peer) {
|
|
GST_DEBUG_OBJECT (int_pad, "dispatching to peer %s:%s",
|
|
GST_DEBUG_PAD_NAME (int_peer));
|
|
done = res = dispatch (int_peer, data);
|
|
gst_object_unref (int_peer);
|
|
} else {
|
|
GST_DEBUG_OBJECT (int_pad, "no peer");
|
|
}
|
|
g_value_reset (&item);
|
|
}
|
|
break;
|
|
case GST_ITERATOR_RESYNC:
|
|
gst_iterator_resync (iter);
|
|
break;
|
|
case GST_ITERATOR_ERROR:
|
|
done = TRUE;
|
|
GST_ERROR_OBJECT (pad, "Could not iterate internally linked pads");
|
|
break;
|
|
case GST_ITERATOR_DONE:
|
|
done = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
g_value_unset (&item);
|
|
gst_iterator_free (iter);
|
|
|
|
GST_DEBUG_OBJECT (pad, "done, result %d", res);
|
|
|
|
no_iter:
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query:
|
|
* @pad: a #GstPad to invoke the default query on.
|
|
* @query: (transfer none): the #GstQuery to perform.
|
|
*
|
|
* Dispatches a query to a pad. The query should have been allocated by the
|
|
* caller via one of the type-specific allocation functions. The element that
|
|
* the pad belongs to is responsible for filling the query with an appropriate
|
|
* response, which should then be parsed with a type-specific query parsing
|
|
* function.
|
|
*
|
|
* Again, the caller is responsible for both the allocation and deallocation of
|
|
* the query structure.
|
|
*
|
|
* Please also note that some queries might need a running pipeline to work.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query (GstPad * pad, GstQuery * query)
|
|
{
|
|
gboolean res;
|
|
GstPadQueryFunction func;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
|
|
|
|
GST_DEBUG_OBJECT (pad, "sending query %p (%s)", query,
|
|
GST_QUERY_TYPE_NAME (query));
|
|
|
|
if ((func = GST_PAD_QUERYFUNC (pad)) == NULL)
|
|
goto no_func;
|
|
|
|
res = func (pad, query);
|
|
|
|
GST_DEBUG_OBJECT (pad, "sent query %p (%s), result %d", query,
|
|
GST_QUERY_TYPE_NAME (query), res);
|
|
|
|
return res;
|
|
|
|
no_func:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "had no query function");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_peer_query:
|
|
* @pad: a #GstPad to invoke the peer query on.
|
|
* @query: (transfer none): the #GstQuery to perform.
|
|
*
|
|
* Performs gst_pad_query() on the peer of @pad.
|
|
*
|
|
* The caller is responsible for both the allocation and deallocation of
|
|
* the query structure.
|
|
*
|
|
* Returns: TRUE if the query could be performed. This function returns %FALSE
|
|
* if @pad has no peer.
|
|
*
|
|
* Since: 0.10.15
|
|
*/
|
|
gboolean
|
|
gst_pad_peer_query (GstPad * pad, GstQuery * query)
|
|
{
|
|
GstPad *peerpad;
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
GST_DEBUG_OBJECT (pad, "peer query %p (%s)", query,
|
|
GST_QUERY_TYPE_NAME (query));
|
|
|
|
peerpad = GST_PAD_PEER (pad);
|
|
if (G_UNLIKELY (peerpad == NULL))
|
|
goto no_peer;
|
|
|
|
gst_object_ref (peerpad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
result = gst_pad_query (peerpad, query);
|
|
|
|
gst_object_unref (peerpad);
|
|
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
no_peer:
|
|
{
|
|
GST_WARNING_OBJECT (pad, "pad has no peer");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_default:
|
|
* @pad: a #GstPad to call the default query handler on.
|
|
* @query: (transfer none): the #GstQuery to handle.
|
|
*
|
|
* Invokes the default query handler for the given pad.
|
|
* The query is sent to all pads internally linked to @pad. Note that
|
|
* if there are many possible sink pads that are internally linked to
|
|
* @pad, only one will be sent the query.
|
|
* Multi-sinkpad elements should implement custom query handlers.
|
|
*
|
|
* Returns: TRUE if the query was performed succesfully.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_default (GstPad * pad, GstQuery * query)
|
|
{
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_POSITION:
|
|
case GST_QUERY_SEEKING:
|
|
case GST_QUERY_FORMATS:
|
|
case GST_QUERY_LATENCY:
|
|
case GST_QUERY_JITTER:
|
|
case GST_QUERY_RATE:
|
|
case GST_QUERY_CONVERT:
|
|
default:
|
|
return gst_pad_dispatcher
|
|
(pad, (GstPadDispatcherFunction) gst_pad_query, query);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* should be called with pad OBJECT_LOCK and STREAM_LOCK held.
|
|
* GST_PAD_IS_BLOCKED (pad) == TRUE when this function is
|
|
* called.
|
|
*
|
|
* This function performs the pad blocking when an event, buffer push
|
|
* is performed on a _SRC_ pad. It blocks the streaming thread after
|
|
* informing the pad has been blocked.
|
|
*
|
|
* An application can with this method wait and block any streaming
|
|
* thread and perform operations such as seeking or linking.
|
|
*
|
|
* Two methods are available for notifying the application of the
|
|
* block:
|
|
* - the callback method, which happens in the STREAMING thread with
|
|
* the STREAM_LOCK held. With this method, the most useful way of
|
|
* dealing with the callback is to post a message to the main thread
|
|
* where the pad block can then be handled outside of the streaming
|
|
* thread. With the last method one can perform all operations such
|
|
* as doing a state change, linking, unblocking, seeking etc on the
|
|
* pad.
|
|
* - the GCond signal method, which makes any thread unblock when
|
|
* the pad block happens.
|
|
*
|
|
* During the actual blocking state, the GST_PAD_BLOCKING flag is set.
|
|
* The GST_PAD_BLOCKING flag is unset when the pad was unblocked.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
static GstFlowReturn
|
|
handle_pad_block (GstPad * pad)
|
|
{
|
|
GstPadBlockCallback callback;
|
|
gpointer user_data;
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "signal block taken");
|
|
|
|
/* flushing, don't bother trying to block and return WRONG_STATE
|
|
* right away */
|
|
if (GST_PAD_IS_FLUSHING (pad))
|
|
goto flushingnonref;
|
|
|
|
/* we grab an extra ref for the callbacks, this is probably not
|
|
* needed (callback code does not have a ref and cannot unref). I
|
|
* think this was done to make it possible to unref the element in
|
|
* the callback, which is in the end totally impossible as it
|
|
* requires grabbing the STREAM_LOCK and OBJECT_LOCK which are
|
|
* all taken when calling this function. */
|
|
gst_object_ref (pad);
|
|
|
|
while (GST_PAD_IS_BLOCKED (pad)) {
|
|
do {
|
|
/* we either have a callback installed to notify the block or
|
|
* some other thread is doing a GCond wait. */
|
|
callback = pad->block_callback;
|
|
pad->block_callback_called = TRUE;
|
|
if (callback) {
|
|
/* there is a callback installed, call it. We release the
|
|
* lock so that the callback can do something usefull with the
|
|
* pad */
|
|
user_data = pad->block_data;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
callback (pad, TRUE, user_data);
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
/* we released the lock, recheck flushing */
|
|
if (GST_PAD_IS_FLUSHING (pad))
|
|
goto flushing;
|
|
} else {
|
|
/* no callback, signal the thread that is doing a GCond wait
|
|
* if any. */
|
|
GST_PAD_BLOCK_BROADCAST (pad);
|
|
}
|
|
} while (pad->block_callback_called == FALSE && GST_PAD_IS_BLOCKED (pad));
|
|
|
|
/* OBJECT_LOCK could have been released when we did the callback, which
|
|
* then could have made the pad unblock so we need to check the blocking
|
|
* condition again. */
|
|
if (!GST_PAD_IS_BLOCKED (pad))
|
|
break;
|
|
|
|
/* now we block the streaming thread. It can be unlocked when we
|
|
* deactivate the pad (which will also set the FLUSHING flag) or
|
|
* when the pad is unblocked. A flushing event will also unblock
|
|
* the pad after setting the FLUSHING flag. */
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"Waiting to be unblocked or set flushing");
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_BLOCKING);
|
|
GST_PAD_BLOCK_WAIT (pad);
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKING);
|
|
|
|
/* see if we got unblocked by a flush or not */
|
|
if (GST_PAD_IS_FLUSHING (pad))
|
|
goto flushing;
|
|
}
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got unblocked");
|
|
|
|
/* when we get here, the pad is unblocked again and we perform
|
|
* the needed unblock code. */
|
|
callback = pad->block_callback;
|
|
if (callback) {
|
|
/* we need to call the callback */
|
|
user_data = pad->block_data;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
callback (pad, FALSE, user_data);
|
|
GST_OBJECT_LOCK (pad);
|
|
} else {
|
|
/* we need to signal the thread waiting on the GCond */
|
|
GST_PAD_BLOCK_BROADCAST (pad);
|
|
}
|
|
|
|
gst_object_unref (pad);
|
|
|
|
return ret;
|
|
|
|
flushingnonref:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pad was flushing");
|
|
return GST_FLOW_WRONG_STATE;
|
|
}
|
|
flushing:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pad became flushing");
|
|
gst_object_unref (pad);
|
|
return GST_FLOW_WRONG_STATE;
|
|
}
|
|
}
|
|
|
|
/* pad offsets */
|
|
|
|
/**
|
|
* gst_pad_get_offset:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the offset applied to the running time of @pad. @pad has to be a source
|
|
* pad.
|
|
*
|
|
* Returns: the offset.
|
|
*/
|
|
gint64
|
|
gst_pad_get_offset (GstPad * pad)
|
|
{
|
|
gint64 result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), 0);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
result = pad->offset;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_offset:
|
|
* @pad: a #GstPad
|
|
* @offset: the offset
|
|
*
|
|
* Set the offset that will be applied to the running time of @pad.
|
|
*/
|
|
void
|
|
gst_pad_set_offset (GstPad * pad, gint64 offset)
|
|
{
|
|
guint idx;
|
|
GstPad *peer;
|
|
GstPad *tmp = NULL;
|
|
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
/* if nothing changed, do nothing */
|
|
if (pad->offset == offset)
|
|
goto done;
|
|
|
|
pad->offset = offset;
|
|
|
|
/* if no peer, we just updated the offset */
|
|
if ((peer = GST_PAD_PEER (pad)) == NULL)
|
|
goto done;
|
|
|
|
/* switch pads around when dealing with a sinkpad */
|
|
if (GST_PAD_IS_SINK (pad)) {
|
|
/* ref the peer so it doesn't go away when we release the lock */
|
|
tmp = gst_object_ref (peer);
|
|
/* make sure we get the peer (the srcpad) */
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* swap pads */
|
|
peer = pad;
|
|
pad = tmp;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
/* check if the pad didn't get relinked */
|
|
if (GST_PAD_PEER (pad) != peer)
|
|
goto done;
|
|
|
|
/* we can release the ref now */
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
/* the index of the segment event in the array */
|
|
idx = GST_EVENT_STICKY_IDX_TYPE (GST_EVENT_SEGMENT);
|
|
|
|
/* lock order is srcpad >> sinkpad */
|
|
GST_OBJECT_LOCK (peer);
|
|
/* take the current segment event, adjust it and then place
|
|
* it on the sinkpad. events on the srcpad are always active. */
|
|
if (replace_event (pad, peer, idx))
|
|
GST_OBJECT_FLAG_SET (peer, GST_PAD_NEED_EVENTS);
|
|
|
|
GST_OBJECT_UNLOCK (peer);
|
|
|
|
done:
|
|
GST_OBJECT_UNLOCK (pad);
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* Data passing functions
|
|
*/
|
|
|
|
static gboolean
|
|
gst_pad_emit_have_data_signal (GstPad * pad, GstMiniObject * obj)
|
|
{
|
|
GValue ret = { 0 };
|
|
GValue args[2] = { {0}, {0} };
|
|
gboolean res;
|
|
GQuark detail;
|
|
|
|
/* init */
|
|
g_value_init (&ret, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (&ret, TRUE);
|
|
g_value_init (&args[0], GST_TYPE_PAD);
|
|
g_value_set_object (&args[0], pad);
|
|
g_value_init (&args[1], GST_MINI_OBJECT_TYPE (obj));
|
|
g_value_set_boxed (&args[1], obj);
|
|
|
|
if (GST_IS_EVENT (obj))
|
|
detail = event_quark;
|
|
else if (GST_IS_BUFFER (obj))
|
|
detail = buffer_quark;
|
|
else if (GST_IS_BUFFER_LIST (obj))
|
|
detail = buffer_list_quark;
|
|
else
|
|
detail = 0;
|
|
|
|
/* actually emit */
|
|
g_signal_emitv (args, gst_pad_signals[PAD_HAVE_DATA], detail, &ret);
|
|
res = g_value_get_boolean (&ret);
|
|
|
|
/* clean up */
|
|
g_value_unset (&ret);
|
|
g_value_unset (&args[0]);
|
|
g_value_unset (&args[1]);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
gst_pad_data_unref (gboolean is_buffer, void *data)
|
|
{
|
|
if (G_LIKELY (is_buffer)) {
|
|
gst_buffer_unref (data);
|
|
} else {
|
|
gst_buffer_list_unref (data);
|
|
}
|
|
}
|
|
|
|
/* this is the chain function that does not perform the additional argument
|
|
* checking for that little extra speed.
|
|
*/
|
|
static inline GstFlowReturn
|
|
gst_pad_chain_data_unchecked (GstPad * pad, gboolean is_buffer, void *data,
|
|
GstPadPushCache * cache)
|
|
{
|
|
gboolean needs_events;
|
|
GstFlowReturn ret;
|
|
gboolean emit_signal;
|
|
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
|
|
needs_events = GST_PAD_NEEDS_EVENTS (pad);
|
|
if (G_UNLIKELY (needs_events)) {
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_EVENTS);
|
|
|
|
GST_DEBUG_OBJECT (pad, "need to update all events");
|
|
ret = gst_pad_update_events (pad);
|
|
if (G_UNLIKELY (ret != GST_FLOW_OK))
|
|
goto events_error;
|
|
}
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* see if the signal should be emited */
|
|
if (G_UNLIKELY (emit_signal)) {
|
|
cache = NULL;
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT_CAST (data)))
|
|
goto dropping;
|
|
}
|
|
|
|
/* NOTE: we read the chainfunc unlocked.
|
|
* we cannot hold the lock for the pad so we might send
|
|
* the data to the wrong function. This is not really a
|
|
* problem since functions are assigned at creation time
|
|
* and don't change that often... */
|
|
if (G_LIKELY (is_buffer)) {
|
|
GstPadChainFunction chainfunc;
|
|
|
|
if (G_UNLIKELY ((chainfunc = GST_PAD_CHAINFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling chainfunction &%s with buffer %p",
|
|
GST_DEBUG_FUNCPTR_NAME (chainfunc), data);
|
|
|
|
if (cache) {
|
|
cache->peer = gst_object_ref (pad);
|
|
}
|
|
|
|
ret = chainfunc (pad, GST_BUFFER_CAST (data));
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"called chainfunction &%s with buffer %p, returned %s",
|
|
GST_DEBUG_FUNCPTR_NAME (chainfunc), data, gst_flow_get_name (ret));
|
|
} else {
|
|
GstPadChainListFunction chainlistfunc;
|
|
|
|
if (G_UNLIKELY ((chainlistfunc = GST_PAD_CHAINLISTFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling chainlistfunction &%s",
|
|
GST_DEBUG_FUNCPTR_NAME (chainlistfunc));
|
|
|
|
ret = chainlistfunc (pad, GST_BUFFER_LIST_CAST (data));
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"called chainlistfunction &%s, returned %s",
|
|
GST_DEBUG_FUNCPTR_NAME (chainlistfunc), gst_flow_get_name (ret));
|
|
}
|
|
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
flushing:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing, but pad was flushing");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_WRONG_STATE;
|
|
}
|
|
dropping:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_DEBUG_OBJECT (pad, "Dropping buffer due to FALSE probe return");
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_OK;
|
|
}
|
|
events_error:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "events were not accepted");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
return ret;
|
|
}
|
|
no_function:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing, but not chainhandler");
|
|
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
|
|
("push on pad %s:%s but it has no chainfunction",
|
|
GST_DEBUG_PAD_NAME (pad)));
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_NOT_SUPPORTED;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_chain:
|
|
* @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
|
|
* @buffer: (transfer full): the #GstBuffer to send, return GST_FLOW_ERROR
|
|
* if not.
|
|
*
|
|
* Chain a buffer to @pad.
|
|
*
|
|
* The function returns #GST_FLOW_WRONG_STATE if the pad was flushing.
|
|
*
|
|
* If the caps on @buffer are different from the current caps on @pad, this
|
|
* function will call any setcaps function (see gst_pad_set_setcaps_function())
|
|
* installed on @pad. If the new caps are not acceptable for @pad, this
|
|
* function returns #GST_FLOW_NOT_NEGOTIATED.
|
|
*
|
|
* The function proceeds calling the chain function installed on @pad (see
|
|
* gst_pad_set_chain_function()) and the return value of that function is
|
|
* returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
|
|
* chain function.
|
|
*
|
|
* In all cases, success or failure, the caller loses its reference to @buffer
|
|
* after calling this function.
|
|
*
|
|
* Returns: a #GstFlowReturn from the pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_chain (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
|
|
|
|
return gst_pad_chain_data_unchecked (pad, TRUE, buffer, NULL);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_pad_chain_list_default (GstPad * pad, GstBufferList * list)
|
|
{
|
|
guint i, len;
|
|
GstBuffer *buffer;
|
|
GstFlowReturn ret;
|
|
|
|
GST_INFO_OBJECT (pad, "chaining each group in list as a merged buffer");
|
|
|
|
len = gst_buffer_list_len (list);
|
|
|
|
ret = GST_FLOW_OK;
|
|
for (i = 0; i < len; i++) {
|
|
buffer = gst_buffer_list_get (list, i);
|
|
ret =
|
|
gst_pad_chain_data_unchecked (pad, TRUE, gst_buffer_ref (buffer), NULL);
|
|
if (ret != GST_FLOW_OK)
|
|
break;
|
|
}
|
|
gst_buffer_list_unref (list);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_chain_list:
|
|
* @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
|
|
* @list: (transfer full): the #GstBufferList to send, return GST_FLOW_ERROR
|
|
* if not.
|
|
*
|
|
* Chain a bufferlist to @pad.
|
|
*
|
|
* The function returns #GST_FLOW_WRONG_STATE if the pad was flushing.
|
|
*
|
|
* If the caps on the first buffer of @list are different from the current
|
|
* caps on @pad, this function will call any setcaps function
|
|
* (see gst_pad_set_setcaps_function()) installed on @pad. If the new caps
|
|
* are not acceptable for @pad, this function returns #GST_FLOW_NOT_NEGOTIATED.
|
|
*
|
|
* The function proceeds calling the chainlist function installed on @pad (see
|
|
* gst_pad_set_chain_list_function()) and the return value of that function is
|
|
* returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
|
|
* chainlist function.
|
|
*
|
|
* In all cases, success or failure, the caller loses its reference to @list
|
|
* after calling this function.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: a #GstFlowReturn from the pad.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_chain_list (GstPad * pad, GstBufferList * list)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
|
|
|
|
return gst_pad_chain_data_unchecked (pad, FALSE, list, NULL);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_pad_push_data (GstPad * pad, gboolean is_buffer, void *data,
|
|
GstPadPushCache * cache)
|
|
{
|
|
GstPad *peer;
|
|
GstFlowReturn ret;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
/* FIXME: this check can go away; pad_set_blocked could be implemented with
|
|
* probes completely or probes with an extended pad block. */
|
|
while (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad)))
|
|
if ((ret = handle_pad_block (pad)) != GST_FLOW_OK)
|
|
goto flushed;
|
|
|
|
/* we emit signals on the pad arg, the peer will have a chance to
|
|
* emit in the _chain() function */
|
|
if (G_UNLIKELY (GST_PAD_DO_BUFFER_SIGNALS (pad) > 0)) {
|
|
cache = NULL;
|
|
/* unlock before emitting */
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* if the signal handler returned FALSE, it means we should just drop the
|
|
* buffer */
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT_CAST (data)))
|
|
goto dropped;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
}
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto not_linked;
|
|
|
|
/* take ref to peer pad before releasing the lock */
|
|
gst_object_ref (peer);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
ret = gst_pad_chain_data_unchecked (peer, is_buffer, data, cache);
|
|
|
|
gst_object_unref (peer);
|
|
|
|
return ret;
|
|
|
|
/* ERROR recovery here */
|
|
flushed:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_DEBUG_OBJECT (pad, "pad block stopped by flush");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return ret;
|
|
}
|
|
dropped:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_DEBUG_OBJECT (pad, "Dropping buffer due to FALSE probe return");
|
|
return GST_FLOW_OK;
|
|
}
|
|
not_linked:
|
|
{
|
|
gst_pad_data_unref (is_buffer, data);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing, but it was not linked");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return GST_FLOW_NOT_LINKED;
|
|
}
|
|
}
|
|
|
|
static inline GstPadPushCache *
|
|
pad_take_cache (GstPad * pad, gpointer * cache_ptr)
|
|
{
|
|
GstPadPushCache *cache;
|
|
|
|
/* try to get the cached data */
|
|
do {
|
|
cache = g_atomic_pointer_get (cache_ptr);
|
|
/* now try to replace the pointer with NULL to mark that we are busy
|
|
* with it */
|
|
} while (!g_atomic_pointer_compare_and_exchange (cache_ptr, cache, NULL));
|
|
|
|
/* we could have a leftover invalid entry */
|
|
if (G_UNLIKELY (cache == PAD_CACHE_INVALID))
|
|
cache = NULL;
|
|
|
|
return cache;
|
|
}
|
|
|
|
static inline void
|
|
pad_free_cache (GstPadPushCache * cache)
|
|
{
|
|
gst_object_unref (cache->peer);
|
|
g_slice_free (GstPadPushCache, cache);
|
|
}
|
|
|
|
static inline void
|
|
pad_put_cache (GstPad * pad, GstPadPushCache * cache, gpointer * cache_ptr)
|
|
{
|
|
/* put it back */
|
|
if (!g_atomic_pointer_compare_and_exchange (cache_ptr, NULL, cache)) {
|
|
/* something changed, clean up our cache */
|
|
pad_free_cache (cache);
|
|
}
|
|
}
|
|
|
|
/* must be called with the pad lock */
|
|
void
|
|
_priv_gst_pad_invalidate_cache (GstPad * pad)
|
|
{
|
|
GstPadPushCache *cache;
|
|
gpointer *cache_ptr;
|
|
|
|
GST_LOG_OBJECT (pad, "Invalidating pad cache");
|
|
|
|
/* we hold the pad lock here so we can get the peer and it stays
|
|
* alive during this call */
|
|
if (GST_PAD_IS_SINK (pad)) {
|
|
if (!(pad = GST_PAD_PEER (pad)))
|
|
return;
|
|
}
|
|
|
|
cache_ptr = (gpointer *) & pad->priv->cache_ptr;
|
|
|
|
/* try to get the cached data */
|
|
do {
|
|
cache = g_atomic_pointer_get (cache_ptr);
|
|
/* now try to replace the pointer with INVALID. If nothing is busy with this
|
|
* caps, we get the cache and clean it up. If something is busy, we replace
|
|
* with INVALID so that when the function finishes and tries to put the
|
|
* cache back, it'll fail and cleanup */
|
|
} while (!g_atomic_pointer_compare_and_exchange (cache_ptr, cache,
|
|
PAD_CACHE_INVALID));
|
|
|
|
if (G_LIKELY (cache && cache != PAD_CACHE_INVALID))
|
|
pad_free_cache (cache);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_push:
|
|
* @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
|
|
* @buffer: (transfer full): the #GstBuffer to push returns GST_FLOW_ERROR
|
|
* if not.
|
|
*
|
|
* Pushes a buffer to the peer of @pad.
|
|
*
|
|
* This function will call an installed pad block before triggering any
|
|
* installed pad probes.
|
|
*
|
|
* If the caps on @buffer are different from the currently configured caps on
|
|
* @pad, this function will call any installed setcaps function on @pad (see
|
|
* gst_pad_set_setcaps_function()). In case of failure to renegotiate the new
|
|
* format, this function returns #GST_FLOW_NOT_NEGOTIATED.
|
|
*
|
|
* The function proceeds calling gst_pad_chain() on the peer pad and returns
|
|
* the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
|
|
* be returned.
|
|
*
|
|
* In all cases, success or failure, the caller loses its reference to @buffer
|
|
* after calling this function.
|
|
*
|
|
* Returns: a #GstFlowReturn from the peer pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_push (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
GstPadPushCache *cache;
|
|
GstFlowReturn ret;
|
|
gpointer *cache_ptr;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
|
|
|
|
cache_ptr = (gpointer *) & pad->priv->cache_ptr;
|
|
|
|
cache = pad_take_cache (pad, cache_ptr);
|
|
|
|
if (G_UNLIKELY (cache == NULL))
|
|
goto slow_path;
|
|
|
|
peer = cache->peer;
|
|
|
|
GST_PAD_STREAM_LOCK (peer);
|
|
if (G_UNLIKELY (g_atomic_pointer_get (cache_ptr) == PAD_CACHE_INVALID))
|
|
goto invalid;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling chainfunction &%s with buffer %p",
|
|
GST_DEBUG_FUNCPTR_NAME (GST_PAD_CHAINFUNC (peer)), buffer);
|
|
|
|
ret = GST_PAD_CHAINFUNC (peer) (peer, buffer);
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"called chainfunction &%s with buffer %p, returned %s",
|
|
GST_DEBUG_FUNCPTR_NAME (GST_PAD_CHAINFUNC (peer)), buffer,
|
|
gst_flow_get_name (ret));
|
|
|
|
GST_PAD_STREAM_UNLOCK (peer);
|
|
|
|
pad_put_cache (pad, cache, cache_ptr);
|
|
|
|
return ret;
|
|
|
|
/* slow path */
|
|
slow_path:
|
|
{
|
|
GstPadPushCache scache = { NULL, };
|
|
|
|
GST_LOG_OBJECT (pad, "Taking slow path");
|
|
|
|
ret = gst_pad_push_data (pad, TRUE, buffer, &scache);
|
|
|
|
if (scache.peer) {
|
|
GstPadPushCache *ncache;
|
|
|
|
GST_LOG_OBJECT (pad, "Caching push data");
|
|
|
|
/* make cache structure */
|
|
ncache = g_slice_new (GstPadPushCache);
|
|
*ncache = scache;
|
|
|
|
pad_put_cache (pad, ncache, cache_ptr);
|
|
}
|
|
return ret;
|
|
}
|
|
invalid:
|
|
{
|
|
GST_PAD_STREAM_UNLOCK (peer);
|
|
pad_free_cache (cache);
|
|
goto slow_path;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_push_list:
|
|
* @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
|
|
* @list: (transfer full): the #GstBufferList to push returns GST_FLOW_ERROR
|
|
* if not.
|
|
*
|
|
* Pushes a buffer list to the peer of @pad.
|
|
*
|
|
* This function will call an installed pad block before triggering any
|
|
* installed pad probes.
|
|
*
|
|
* If the caps on the first buffer in the first group of @list are different
|
|
* from the currently configured caps on @pad, this function will call any
|
|
* installed setcaps function on @pad (see gst_pad_set_setcaps_function()). In
|
|
* case of failure to renegotiate the new format, this function returns
|
|
* #GST_FLOW_NOT_NEGOTIATED.
|
|
*
|
|
* If there are any probes installed on @pad every group of the buffer list
|
|
* will be merged into a normal #GstBuffer and pushed via gst_pad_push and the
|
|
* buffer list will be unreffed.
|
|
*
|
|
* The function proceeds calling the chain function on the peer pad and returns
|
|
* the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
|
|
* be returned. If the peer pad does not have any installed chainlist function
|
|
* every group buffer of the list will be merged into a normal #GstBuffer and
|
|
* chained via gst_pad_chain().
|
|
*
|
|
* In all cases, success or failure, the caller loses its reference to @list
|
|
* after calling this function.
|
|
*
|
|
* Returns: a #GstFlowReturn from the peer pad.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_push_list (GstPad * pad, GstBufferList * list)
|
|
{
|
|
GstPadPushCache *cache;
|
|
GstFlowReturn ret;
|
|
gpointer *cache_ptr;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
|
|
|
|
cache_ptr = (gpointer *) & pad->priv->cache_ptr;
|
|
|
|
cache = pad_take_cache (pad, cache_ptr);
|
|
|
|
if (G_UNLIKELY (cache == NULL))
|
|
goto slow_path;
|
|
|
|
peer = cache->peer;
|
|
|
|
GST_PAD_STREAM_LOCK (peer);
|
|
if (G_UNLIKELY (g_atomic_pointer_get (cache_ptr) == PAD_CACHE_INVALID))
|
|
goto invalid;
|
|
|
|
ret = GST_PAD_CHAINLISTFUNC (peer) (peer, list);
|
|
|
|
GST_PAD_STREAM_UNLOCK (peer);
|
|
|
|
pad_put_cache (pad, cache, cache_ptr);
|
|
|
|
return ret;
|
|
|
|
/* slow path */
|
|
slow_path:
|
|
{
|
|
GstPadPushCache scache = { NULL, };
|
|
|
|
GST_LOG_OBJECT (pad, "Taking slow path");
|
|
|
|
ret = gst_pad_push_data (pad, FALSE, list, &scache);
|
|
|
|
if (scache.peer) {
|
|
GstPadPushCache *ncache;
|
|
|
|
GST_LOG_OBJECT (pad, "Caching push data");
|
|
|
|
/* make cache structure */
|
|
ncache = g_slice_new (GstPadPushCache);
|
|
*ncache = scache;
|
|
|
|
pad_put_cache (pad, ncache, cache_ptr);
|
|
}
|
|
return ret;
|
|
}
|
|
invalid:
|
|
{
|
|
GST_PAD_STREAM_UNLOCK (peer);
|
|
pad_free_cache (cache);
|
|
goto slow_path;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_pad_get_range_unchecked (GstPad * pad, guint64 offset, guint size,
|
|
GstBuffer ** buffer)
|
|
{
|
|
GstFlowReturn ret;
|
|
GstPadGetRangeFunction getrangefunc;
|
|
gboolean emit_signal;
|
|
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (G_UNLIKELY ((getrangefunc = GST_PAD_GETRANGEFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling getrangefunc %s, offset %"
|
|
G_GUINT64_FORMAT ", size %u",
|
|
GST_DEBUG_FUNCPTR_NAME (getrangefunc), offset, size);
|
|
|
|
ret = getrangefunc (pad, offset, size, buffer);
|
|
|
|
/* can only fire the signal if we have a valid buffer */
|
|
if (G_UNLIKELY (emit_signal) && (ret == GST_FLOW_OK)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT_CAST (*buffer)))
|
|
goto dropping;
|
|
}
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
|
|
if (G_UNLIKELY (ret != GST_FLOW_OK))
|
|
goto get_range_failed;
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
flushing:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pulling range, but pad was flushing");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_WRONG_STATE;
|
|
}
|
|
no_function:
|
|
{
|
|
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
|
|
("pullrange on pad %s:%s but it has no getrangefunction",
|
|
GST_DEBUG_PAD_NAME (pad)));
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_NOT_SUPPORTED;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"Dropping data after FALSE probe return");
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
gst_buffer_unref (*buffer);
|
|
*buffer = NULL;
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
get_range_failed:
|
|
{
|
|
*buffer = NULL;
|
|
GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
|
|
(ret >= GST_FLOW_UNEXPECTED) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
|
|
pad, "getrange failed, flow: %s", gst_flow_get_name (ret));
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_range:
|
|
* @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
|
|
* @offset: The start offset of the buffer
|
|
* @size: The length of the buffer
|
|
* @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
|
|
* returns #GST_FLOW_ERROR if %NULL.
|
|
*
|
|
* When @pad is flushing this function returns #GST_FLOW_WRONG_STATE
|
|
* immediatly and @buffer is %NULL.
|
|
*
|
|
* Calls the getrange function of @pad, see #GstPadGetRangeFunction for a
|
|
* description of a getrange function. If @pad has no getrange function
|
|
* installed (see gst_pad_set_getrange_function()) this function returns
|
|
* #GST_FLOW_NOT_SUPPORTED.
|
|
*
|
|
* This is a lowlevel function. Usualy gst_pad_pull_range() is used.
|
|
*
|
|
* Returns: a #GstFlowReturn from the pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_get_range (GstPad * pad, guint64 offset, guint size,
|
|
GstBuffer ** buffer)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
|
|
return gst_pad_get_range_unchecked (pad, offset, size, buffer);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_pull_range:
|
|
* @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
|
|
* @offset: The start offset of the buffer
|
|
* @size: The length of the buffer
|
|
* @buffer: (out callee-allocates): a pointer to hold the #GstBuffer, returns
|
|
* GST_FLOW_ERROR if %NULL.
|
|
*
|
|
* Pulls a @buffer from the peer pad.
|
|
*
|
|
* This function will first trigger the pad block signal if it was
|
|
* installed.
|
|
*
|
|
* When @pad is not linked #GST_FLOW_NOT_LINKED is returned else this
|
|
* function returns the result of gst_pad_get_range() on the peer pad.
|
|
* See gst_pad_get_range() for a list of return values and for the
|
|
* semantics of the arguments of this function.
|
|
*
|
|
* @buffer's caps must either be unset or the same as what is already
|
|
* configured on @pad. Renegotiation within a running pull-mode pipeline is not
|
|
* supported.
|
|
*
|
|
* Returns: a #GstFlowReturn from the peer pad.
|
|
* When this function returns #GST_FLOW_OK, @buffer will contain a valid
|
|
* #GstBuffer that should be freed with gst_buffer_unref() after usage.
|
|
* @buffer may not be used or freed when any other return value than
|
|
* #GST_FLOW_OK is returned.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_pull_range (GstPad * pad, guint64 offset, guint size,
|
|
GstBuffer ** buffer)
|
|
{
|
|
GstPad *peer;
|
|
GstFlowReturn ret;
|
|
gboolean emit_signal;
|
|
gboolean needs_events;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
while (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad)))
|
|
handle_pad_block (pad);
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto not_connected;
|
|
|
|
/* signal emision for the pad, peer has chance to emit when
|
|
* we call _get_range() */
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
|
|
gst_object_ref (peer);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
ret = gst_pad_get_range_unchecked (peer, offset, size, buffer);
|
|
|
|
gst_object_unref (peer);
|
|
|
|
if (G_UNLIKELY (ret != GST_FLOW_OK))
|
|
goto pull_range_failed;
|
|
|
|
/* can only fire the signal if we have a valid buffer */
|
|
if (G_UNLIKELY (emit_signal)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT_CAST (*buffer)))
|
|
goto dropping;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
needs_events = GST_PAD_NEEDS_EVENTS (pad);
|
|
if (G_UNLIKELY (needs_events)) {
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_EVENTS);
|
|
|
|
GST_DEBUG_OBJECT (pad, "we need to update the events");
|
|
ret = gst_pad_update_events (pad);
|
|
if (G_UNLIKELY (ret != GST_FLOW_OK))
|
|
goto events_error;
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return ret;
|
|
|
|
/* ERROR recovery here */
|
|
not_connected:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pulling range, but it was not linked");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return GST_FLOW_NOT_LINKED;
|
|
}
|
|
pull_range_failed:
|
|
{
|
|
*buffer = NULL;
|
|
GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
|
|
(ret >= GST_FLOW_UNEXPECTED) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
|
|
pad, "pullrange failed, flow: %s", gst_flow_get_name (ret));
|
|
return ret;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"Dropping data after FALSE probe return");
|
|
gst_buffer_unref (*buffer);
|
|
*buffer = NULL;
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
events_error:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
gst_buffer_unref (*buffer);
|
|
*buffer = NULL;
|
|
GST_CAT_WARNING_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pullrange returned events that were not accepted");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_push_event:
|
|
* @pad: a #GstPad to push the event to.
|
|
* @event: (transfer full): the #GstEvent to send to the pad.
|
|
*
|
|
* Sends the event to the peer of the given pad. This function is
|
|
* mainly used by elements to send events to their peer
|
|
* elements.
|
|
*
|
|
* This function takes owership of the provided event so you should
|
|
* gst_event_ref() it if you want to reuse the event after this call.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_push_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstPad *peerpad;
|
|
gboolean result;
|
|
gint64 offset;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
|
|
|
|
GST_LOG_OBJECT (pad, "event: %s", GST_EVENT_TYPE_NAME (event));
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
/* Two checks to be made:
|
|
* . (un)set the FLUSHING flag for flushing events,
|
|
* . handle pad blocking */
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_FLUSH_START:
|
|
_priv_gst_pad_invalidate_cache (pad);
|
|
GST_PAD_SET_FLUSHING (pad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) {
|
|
/* flush start will have set the FLUSHING flag and will then
|
|
* unlock all threads doing a GCond wait on the blocking pad. This
|
|
* will typically unblock the STREAMING thread blocked on a pad. */
|
|
GST_LOG_OBJECT (pad, "Pad is blocked, not forwarding flush-start, "
|
|
"doing block signal.");
|
|
GST_PAD_BLOCK_BROADCAST (pad);
|
|
goto flushed;
|
|
}
|
|
break;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
GST_PAD_UNSET_FLUSHING (pad);
|
|
|
|
/* if we are blocked, flush away the FLUSH_STOP event */
|
|
if (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) {
|
|
GST_LOG_OBJECT (pad, "Pad is blocked, not forwarding flush-stop");
|
|
goto flushed;
|
|
}
|
|
break;
|
|
case GST_EVENT_RECONFIGURE:
|
|
if (GST_PAD_IS_SINK (pad))
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_RECONFIGURE);
|
|
default:
|
|
while (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) {
|
|
/* block the event as long as the pad is blocked */
|
|
if (handle_pad_block (pad) != GST_FLOW_OK)
|
|
goto flushed;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (G_UNLIKELY (GST_PAD_DO_EVENT_SIGNALS (pad) > 0)) {
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT_CAST (event)))
|
|
goto dropping;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
}
|
|
|
|
/* store the event on the pad, but only on srcpads */
|
|
if (GST_PAD_IS_SRC (pad) && GST_EVENT_IS_STICKY (event)) {
|
|
guint idx;
|
|
|
|
idx = GST_EVENT_STICKY_IDX (event);
|
|
GST_LOG_OBJECT (pad, "storing sticky event %s at index %u",
|
|
GST_EVENT_TYPE_NAME (event), idx);
|
|
|
|
/* srcpad sticky events always become active immediately */
|
|
gst_event_replace (&pad->priv->events[idx].event, event);
|
|
}
|
|
|
|
if ((peerpad = GST_PAD_PEER (pad)))
|
|
gst_object_ref (peerpad);
|
|
|
|
offset = pad->offset;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* backwards compatibility mode for caps */
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
|
|
gst_event_parse_caps (event, &caps);
|
|
/* FIXME, this is awkward because we don't check flushing here which means
|
|
* that we can call the setcaps functions on flushing pads, this is not
|
|
* quite what we want, otoh, this code should just go away and elements
|
|
* that set caps on their sinkpad should just setup stuff themselves. */
|
|
gst_pad_call_setcaps (pad, caps);
|
|
break;
|
|
}
|
|
case GST_EVENT_SEGMENT:
|
|
/* check if we need to adjust the segment */
|
|
if (offset != 0 && peerpad != NULL) {
|
|
GstSegment segment;
|
|
|
|
/* copy segment values */
|
|
gst_event_copy_segment (event, &segment);
|
|
gst_event_unref (event);
|
|
|
|
/* adjust and make a new event with the offset applied */
|
|
segment.base += offset;
|
|
event = gst_event_new_segment (&segment);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* now check the peer pad */
|
|
if (peerpad == NULL)
|
|
goto not_linked;
|
|
|
|
GST_LOG_OBJECT (pad, "sending event %s to peerpad %" GST_PTR_FORMAT,
|
|
GST_EVENT_TYPE_NAME (event), peerpad);
|
|
|
|
result = gst_pad_send_event (peerpad, event);
|
|
|
|
/* Note: we gave away ownership of the event at this point */
|
|
GST_LOG_OBJECT (pad, "sent event to peerpad %" GST_PTR_FORMAT ", result %d",
|
|
peerpad, result);
|
|
|
|
gst_object_unref (peerpad);
|
|
|
|
return result;
|
|
|
|
/* ERROR handling */
|
|
dropping:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "Dropping event after FALSE probe return");
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
not_linked:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "Dropping event because pad is not linked");
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
flushed:
|
|
{
|
|
GST_DEBUG_OBJECT (pad,
|
|
"Not forwarding event since we're flushing and blocking");
|
|
gst_event_unref (event);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_send_event:
|
|
* @pad: a #GstPad to send the event to.
|
|
* @event: (transfer full): the #GstEvent to send to the pad.
|
|
*
|
|
* Sends the event to the pad. This function can be used
|
|
* by applications to send events in the pipeline.
|
|
*
|
|
* If @pad is a source pad, @event should be an upstream event. If @pad is a
|
|
* sink pad, @event should be a downstream event. For example, you would not
|
|
* send a #GST_EVENT_EOS on a src pad; EOS events only propagate downstream.
|
|
* Furthermore, some downstream events have to be serialized with data flow,
|
|
* like EOS, while some can travel out-of-band, like #GST_EVENT_FLUSH_START. If
|
|
* the event needs to be serialized with data flow, this function will take the
|
|
* pad's stream lock while calling its event function.
|
|
*
|
|
* To find out whether an event type is upstream, downstream, or downstream and
|
|
* serialized, see #GstEventTypeFlags, gst_event_type_get_flags(),
|
|
* #GST_EVENT_IS_UPSTREAM, #GST_EVENT_IS_DOWNSTREAM, and
|
|
* #GST_EVENT_IS_SERIALIZED. Note that in practice that an application or
|
|
* plugin doesn't need to bother itself with this information; the core handles
|
|
* all necessary locks and checks.
|
|
*
|
|
* This function takes owership of the provided event so you should
|
|
* gst_event_ref() it if you want to reuse the event after this call.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*/
|
|
gboolean
|
|
gst_pad_send_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
gboolean result = FALSE;
|
|
gboolean serialized, need_unlock = FALSE, needs_events, sticky;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
if (GST_PAD_IS_SINK (pad)) {
|
|
if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
|
|
goto wrong_direction;
|
|
serialized = GST_EVENT_IS_SERIALIZED (event);
|
|
sticky = GST_EVENT_IS_STICKY (event);
|
|
} else if (GST_PAD_IS_SRC (pad)) {
|
|
if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
|
|
goto wrong_direction;
|
|
/* events on srcpad never are serialized and sticky */
|
|
serialized = sticky = FALSE;
|
|
} else
|
|
goto unknown_direction;
|
|
|
|
/* pad signals */
|
|
if (G_UNLIKELY (GST_PAD_DO_EVENT_SIGNALS (pad) > 0)) {
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT_CAST (event)))
|
|
goto dropping;
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
}
|
|
/* get the flag first, we clear it when we have a FLUSH or a non-serialized
|
|
* event. */
|
|
needs_events = GST_PAD_NEEDS_EVENTS (pad);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_FLUSH_START:
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
|
|
"have event type %d (FLUSH_START)", GST_EVENT_TYPE (event));
|
|
|
|
/* can't even accept a flush begin event when flushing */
|
|
if (GST_PAD_IS_FLUSHING (pad))
|
|
goto flushing;
|
|
|
|
_priv_gst_pad_invalidate_cache (pad);
|
|
GST_PAD_SET_FLUSHING (pad);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "set flush flag");
|
|
needs_events = FALSE;
|
|
break;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
if (G_LIKELY (GST_PAD_ACTIVATE_MODE (pad) != GST_ACTIVATE_NONE)) {
|
|
GST_PAD_UNSET_FLUSHING (pad);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "cleared flush flag");
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
/* grab stream lock */
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
need_unlock = TRUE;
|
|
GST_OBJECT_LOCK (pad);
|
|
needs_events = FALSE;
|
|
break;
|
|
case GST_EVENT_RECONFIGURE:
|
|
if (GST_PAD_IS_SRC (pad))
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_RECONFIGURE);
|
|
default:
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "have event type %s",
|
|
GST_EVENT_TYPE_NAME (event));
|
|
|
|
if (serialized) {
|
|
/* lock order: STREAM_LOCK, LOCK, recheck flushing. */
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
need_unlock = TRUE;
|
|
GST_OBJECT_LOCK (pad);
|
|
} else {
|
|
/* don't forward events on non-serialized events */
|
|
needs_events = FALSE;
|
|
}
|
|
|
|
/* store the event on the pad, but only on srcpads. We need to store the
|
|
* event before checking the flushing flag. */
|
|
if (sticky) {
|
|
guint idx;
|
|
PadEvent *ev;
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_SEGMENT:
|
|
if (pad->offset != 0) {
|
|
GstSegment segment;
|
|
|
|
/* copy segment values */
|
|
gst_event_copy_segment (event, &segment);
|
|
gst_event_unref (event);
|
|
|
|
/* adjust and make a new event with the offset applied */
|
|
segment.base += pad->offset;
|
|
event = gst_event_new_segment (&segment);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
idx = GST_EVENT_STICKY_IDX (event);
|
|
ev = &pad->priv->events[idx];
|
|
|
|
GST_LOG_OBJECT (pad, "storing sticky event %s at index %u",
|
|
GST_EVENT_TYPE_NAME (event), idx);
|
|
|
|
if (ev->event != event) {
|
|
gst_event_replace (&ev->pending, event);
|
|
/* set the flag so that we update the events next time. We would
|
|
* usually update below but we might be flushing too. */
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_EVENTS);
|
|
needs_events = TRUE;
|
|
}
|
|
}
|
|
/* now check the flushing flag */
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
|
|
break;
|
|
}
|
|
|
|
if (G_UNLIKELY (needs_events)) {
|
|
GstFlowReturn ret;
|
|
|
|
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_EVENTS);
|
|
|
|
GST_DEBUG_OBJECT (pad, "need to update all events");
|
|
ret = gst_pad_update_events (pad);
|
|
if (ret != GST_FLOW_OK)
|
|
goto update_failed;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
gst_event_unref (event);
|
|
|
|
result = TRUE;
|
|
} else {
|
|
GstPadEventFunction eventfunc;
|
|
|
|
if (G_UNLIKELY ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
result = do_event_function (pad, event, eventfunc);
|
|
}
|
|
|
|
if (need_unlock)
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
|
|
GST_DEBUG_OBJECT (pad, "sent event, result %d", result);
|
|
|
|
return result;
|
|
|
|
/* ERROR handling */
|
|
wrong_direction:
|
|
{
|
|
g_warning ("pad %s:%s sending %s event in wrong direction",
|
|
GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
unknown_direction:
|
|
{
|
|
g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
no_function:
|
|
{
|
|
g_warning ("pad %s:%s has no event handler, file a bug.",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
if (need_unlock)
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
flushing:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
if (need_unlock)
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
|
|
"Received event on flushing pad. Discarding");
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "Dropping event after FALSE probe return");
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
update_failed:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
if (need_unlock)
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad, "Update events failed");
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_element_private:
|
|
* @pad: the #GstPad to set the private data of.
|
|
* @priv: The private data to attach to the pad.
|
|
*
|
|
* Set the given private data gpointer on the pad.
|
|
* This function can only be used by the element that owns the pad.
|
|
* No locking is performed in this function.
|
|
*/
|
|
void
|
|
gst_pad_set_element_private (GstPad * pad, gpointer priv)
|
|
{
|
|
pad->element_private = priv;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_element_private:
|
|
* @pad: the #GstPad to get the private data of.
|
|
*
|
|
* Gets the private data of a pad.
|
|
* No locking is performed in this function.
|
|
*
|
|
* Returns: (transfer none): a #gpointer to the private data.
|
|
*/
|
|
gpointer
|
|
gst_pad_get_element_private (GstPad * pad)
|
|
{
|
|
return pad->element_private;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_sticky_event:
|
|
* @pad: the #GstPad to get the event from.
|
|
* @event_type: the #GstEventType that should be retrieved.
|
|
*
|
|
* Returns a new reference of the sticky event of type @event_type
|
|
* from the event.
|
|
*
|
|
* Returns: (transfer full): a #GstEvent of type @event_type. Unref after usage.
|
|
*/
|
|
GstEvent *
|
|
gst_pad_get_sticky_event (GstPad * pad, GstEventType event_type)
|
|
{
|
|
GstEvent *event = NULL;
|
|
guint idx;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
g_return_val_if_fail ((event_type & GST_EVENT_TYPE_STICKY) != 0, NULL);
|
|
|
|
idx = GST_EVENT_STICKY_IDX_TYPE (event_type);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
if ((event = pad->priv->events[idx].event)) {
|
|
gst_event_ref (event);
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return event;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_sticky_events_foreach:
|
|
* @pad: the #GstPad that should be used for iteration.
|
|
* @foreach_func: (scope call): the #GstPadStickyEventsForeachFunction that should be called for every event.
|
|
* @user_data: (closure): the optional user data.
|
|
*
|
|
* Iterates all active sticky events on @pad and calls @foreach_func for every
|
|
* event. If @foreach_func returns something else than GST_FLOW_OK the iteration
|
|
* is immediately stopped.
|
|
*
|
|
* Returns: GST_FLOW_OK if iteration was successful
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_sticky_events_foreach (GstPad * pad,
|
|
GstPadStickyEventsForeachFunction foreach_func, gpointer user_data)
|
|
{
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
guint i;
|
|
GstEvent *event;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (foreach_func != NULL, GST_FLOW_ERROR);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
|
|
restart:
|
|
for (i = 0; i < GST_EVENT_MAX_STICKY; i++) {
|
|
gboolean res;
|
|
PadEvent *ev;
|
|
|
|
ev = &pad->priv->events[i];
|
|
|
|
/* skip without active event */
|
|
if ((event = ev->event) == NULL)
|
|
continue;
|
|
|
|
gst_event_ref (event);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
res = foreach_func (pad, event, user_data);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
gst_event_unref (event);
|
|
|
|
if (res != GST_FLOW_OK) {
|
|
ret = res;
|
|
break;
|
|
}
|
|
|
|
/* things could have changed while we release the lock, check if we still
|
|
* are handling the same event, if we don't something changed and we have
|
|
* to try again. FIXME. we need a cookie here. */
|
|
if (event != ev->event) {
|
|
GST_DEBUG_OBJECT (pad, "events changed, restarting");
|
|
goto restart;
|
|
}
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
do_stream_status (GstPad * pad, GstStreamStatusType type,
|
|
GThread * thread, GstTask * task)
|
|
{
|
|
GstElement *parent;
|
|
|
|
GST_DEBUG_OBJECT (pad, "doing stream-status %d", type);
|
|
|
|
if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (pad)))) {
|
|
if (GST_IS_ELEMENT (parent)) {
|
|
GstMessage *message;
|
|
GValue value = { 0 };
|
|
|
|
if (type == GST_STREAM_STATUS_TYPE_ENTER) {
|
|
gchar *tname, *ename, *pname;
|
|
|
|
/* create a good task name */
|
|
ename = gst_element_get_name (parent);
|
|
pname = gst_pad_get_name (pad);
|
|
tname = g_strdup_printf ("%s:%s", ename, pname);
|
|
g_free (ename);
|
|
g_free (pname);
|
|
|
|
gst_object_set_name (GST_OBJECT_CAST (task), tname);
|
|
g_free (tname);
|
|
}
|
|
|
|
message = gst_message_new_stream_status (GST_OBJECT_CAST (pad),
|
|
type, parent);
|
|
|
|
g_value_init (&value, GST_TYPE_TASK);
|
|
g_value_set_object (&value, task);
|
|
gst_message_set_stream_status_object (message, &value);
|
|
g_value_unset (&value);
|
|
|
|
GST_DEBUG_OBJECT (pad, "posting stream-status %d", type);
|
|
gst_element_post_message (parent, message);
|
|
}
|
|
gst_object_unref (parent);
|
|
}
|
|
}
|
|
|
|
static void
|
|
pad_enter_thread (GstTask * task, GThread * thread, gpointer user_data)
|
|
{
|
|
do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_ENTER,
|
|
thread, task);
|
|
}
|
|
|
|
static void
|
|
pad_leave_thread (GstTask * task, GThread * thread, gpointer user_data)
|
|
{
|
|
do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_LEAVE,
|
|
thread, task);
|
|
}
|
|
|
|
static GstTaskThreadCallbacks thr_callbacks = {
|
|
pad_enter_thread,
|
|
pad_leave_thread,
|
|
};
|
|
|
|
/**
|
|
* gst_pad_start_task:
|
|
* @pad: the #GstPad to start the task of
|
|
* @func: the task function to call
|
|
* @data: data passed to the task function
|
|
*
|
|
* Starts a task that repeatedly calls @func with @data. This function
|
|
* is mostly used in pad activation functions to start the dataflow.
|
|
* The #GST_PAD_STREAM_LOCK of @pad will automatically be acquired
|
|
* before @func is called.
|
|
*
|
|
* Returns: a %TRUE if the task could be started.
|
|
*/
|
|
gboolean
|
|
gst_pad_start_task (GstPad * pad, GstTaskFunction func, gpointer data)
|
|
{
|
|
GstTask *task;
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (func != NULL, FALSE);
|
|
|
|
GST_DEBUG_OBJECT (pad, "start task");
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
task = GST_PAD_TASK (pad);
|
|
if (task == NULL) {
|
|
task = gst_task_create (func, data);
|
|
gst_task_set_lock (task, GST_PAD_GET_STREAM_LOCK (pad));
|
|
gst_task_set_thread_callbacks (task, &thr_callbacks, pad, NULL);
|
|
GST_DEBUG_OBJECT (pad, "created task");
|
|
GST_PAD_TASK (pad) = task;
|
|
gst_object_ref (task);
|
|
/* release lock to post the message */
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
do_stream_status (pad, GST_STREAM_STATUS_TYPE_CREATE, NULL, task);
|
|
|
|
gst_object_unref (task);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
/* nobody else is supposed to have changed the pad now */
|
|
if (GST_PAD_TASK (pad) != task)
|
|
goto concurrent_stop;
|
|
}
|
|
res = gst_task_set_state (task, GST_TASK_STARTED);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return res;
|
|
|
|
/* ERRORS */
|
|
concurrent_stop:
|
|
{
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_pause_task:
|
|
* @pad: the #GstPad to pause the task of
|
|
*
|
|
* Pause the task of @pad. This function will also wait until the
|
|
* function executed by the task is finished if this function is not
|
|
* called from the task function.
|
|
*
|
|
* Returns: a TRUE if the task could be paused or FALSE when the pad
|
|
* has no task.
|
|
*/
|
|
gboolean
|
|
gst_pad_pause_task (GstPad * pad)
|
|
{
|
|
GstTask *task;
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_DEBUG_OBJECT (pad, "pause task");
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
task = GST_PAD_TASK (pad);
|
|
if (task == NULL)
|
|
goto no_task;
|
|
res = gst_task_set_state (task, GST_TASK_PAUSED);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* wait for task function to finish, this lock is recursive so it does nothing
|
|
* when the pause is called from the task itself */
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
|
|
return res;
|
|
|
|
no_task:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "pad has no task");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_stop_task:
|
|
* @pad: the #GstPad to stop the task of
|
|
*
|
|
* Stop the task of @pad. This function will also make sure that the
|
|
* function executed by the task will effectively stop if not called
|
|
* from the GstTaskFunction.
|
|
*
|
|
* This function will deadlock if called from the GstTaskFunction of
|
|
* the task. Use gst_task_pause() instead.
|
|
*
|
|
* Regardless of whether the pad has a task, the stream lock is acquired and
|
|
* released so as to ensure that streaming through this pad has finished.
|
|
*
|
|
* Returns: a TRUE if the task could be stopped or FALSE on error.
|
|
*/
|
|
gboolean
|
|
gst_pad_stop_task (GstPad * pad)
|
|
{
|
|
GstTask *task;
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_DEBUG_OBJECT (pad, "stop task");
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
task = GST_PAD_TASK (pad);
|
|
if (task == NULL)
|
|
goto no_task;
|
|
GST_PAD_TASK (pad) = NULL;
|
|
res = gst_task_set_state (task, GST_TASK_STOPPED);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
|
|
if (!gst_task_join (task))
|
|
goto join_failed;
|
|
|
|
gst_object_unref (task);
|
|
|
|
return res;
|
|
|
|
no_task:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "no task");
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
GST_PAD_STREAM_LOCK (pad);
|
|
GST_PAD_STREAM_UNLOCK (pad);
|
|
|
|
/* this is not an error */
|
|
return TRUE;
|
|
}
|
|
join_failed:
|
|
{
|
|
/* this is bad, possibly the application tried to join the task from
|
|
* the task's thread. We install the task again so that it will be stopped
|
|
* again from the right thread next time hopefully. */
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_DEBUG_OBJECT (pad, "join failed");
|
|
/* we can only install this task if there was no other task */
|
|
if (GST_PAD_TASK (pad) == NULL)
|
|
GST_PAD_TASK (pad) = task;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return FALSE;
|
|
}
|
|
}
|