mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-14 05:12:09 +00:00
a599a5b1df
Original commit message from CVS: Created an overridable method for seeking on an element, along with a default implementation. make queue flush on discont (not entirely correct) removed the new_media from the discont event.
2448 lines
70 KiB
C
2448 lines
70 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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* gstelement.c: The base element, all elements derive from this
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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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/* #define GST_DEBUG_ENABLED */
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#include <glib.h>
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#include <stdarg.h>
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#include <gobject/gvaluecollector.h>
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#include "gst_private.h"
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#include "gstelement.h"
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#include "gstextratypes.h"
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#include "gstbin.h"
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#include "gstscheduler.h"
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#include "gstevent.h"
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#include "gstutils.h"
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/* Element signals and args */
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enum {
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STATE_CHANGE,
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NEW_PAD,
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PAD_REMOVED,
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ERROR,
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EOS,
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DEEP_NOTIFY,
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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/* FILL ME */
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};
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#define CLASS(element) GST_ELEMENT_CLASS (G_OBJECT_GET_CLASS (element))
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static void gst_element_class_init (GstElementClass *klass);
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static void gst_element_init (GstElement *element);
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static void gst_element_base_class_init (GstElementClass *klass);
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static void gst_element_real_set_property (GObject *object, guint prop_id,
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const GValue *value, GParamSpec *pspec);
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static void gst_element_real_get_property (GObject *object, guint prop_id, GValue *value,
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GParamSpec *pspec);
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static void gst_element_dispatch_properties_changed (GObject * object, guint n_pspecs, GParamSpec **pspecs);
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static void gst_element_dispose (GObject *object);
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static gboolean gst_element_send_event_default (GstElement *element, GstEvent *event);
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static GstElementStateReturn gst_element_change_state (GstElement *element);
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static void gst_element_error_func (GstElement* element, GstElement *source, gchar *errormsg);
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#ifndef GST_DISABLE_LOADSAVE
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static xmlNodePtr gst_element_save_thyself (GstObject *object, xmlNodePtr parent);
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static void gst_element_restore_thyself (GstObject *parent, xmlNodePtr self);
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#endif
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GType _gst_element_type = 0;
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static GstObjectClass *parent_class = NULL;
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static guint gst_element_signals[LAST_SIGNAL] = { 0 };
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GType gst_element_get_type (void)
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{
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if (!_gst_element_type) {
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static const GTypeInfo element_info = {
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sizeof(GstElementClass),
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(GBaseInitFunc)gst_element_base_class_init,
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NULL,
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(GClassInitFunc)gst_element_class_init,
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NULL,
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NULL,
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sizeof(GstElement),
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0,
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(GInstanceInitFunc)gst_element_init,
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NULL
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};
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_gst_element_type = g_type_register_static(GST_TYPE_OBJECT, "GstElement",
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&element_info, G_TYPE_FLAG_ABSTRACT);
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}
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return _gst_element_type;
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}
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static void
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gst_element_class_init (GstElementClass *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 = (GObjectClass*) klass;
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gstobject_class = (GstObjectClass*) klass;
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parent_class = g_type_class_ref(GST_TYPE_OBJECT);
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gst_element_signals[STATE_CHANGE] =
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g_signal_new ("state_change", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, state_change), NULL, NULL,
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gst_marshal_VOID__INT_INT, G_TYPE_NONE, 2,
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G_TYPE_INT, G_TYPE_INT);
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gst_element_signals[NEW_PAD] =
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g_signal_new ("new_pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, new_pad), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
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G_TYPE_OBJECT);
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gst_element_signals[PAD_REMOVED] =
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g_signal_new ("pad_removed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, pad_removed), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
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G_TYPE_OBJECT);
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gst_element_signals[ERROR] =
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g_signal_new ("error", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, error), NULL, NULL,
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gst_marshal_VOID__OBJECT_STRING, G_TYPE_NONE, 2,
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G_TYPE_OBJECT, G_TYPE_STRING);
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gst_element_signals[EOS] =
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g_signal_new ("eos", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass,eos), NULL, NULL,
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gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
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gst_element_signals[DEEP_NOTIFY] =
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g_signal_new ("deep_notify", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
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G_STRUCT_OFFSET (GstElementClass, deep_notify), NULL, NULL,
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gst_marshal_VOID__OBJECT_PARAM, G_TYPE_NONE,
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2, G_TYPE_OBJECT, G_TYPE_PARAM);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_element_real_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_element_real_get_property);
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/* see the comments at gst_element_dispatch_properties_changed */
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gobject_class->dispatch_properties_changed
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= GST_DEBUG_FUNCPTR (gst_element_dispatch_properties_changed);
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gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_element_dispose);
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#ifndef GST_DISABLE_LOADSAVE
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gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_element_save_thyself);
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gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR (gst_element_restore_thyself);
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#endif
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klass->change_state = GST_DEBUG_FUNCPTR (gst_element_change_state);
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klass->error = GST_DEBUG_FUNCPTR (gst_element_error_func);
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klass->elementfactory = NULL;
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klass->padtemplates = NULL;
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klass->numpadtemplates = 0;
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klass->send_event = GST_DEBUG_FUNCPTR (gst_element_send_event_default);
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}
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static void
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gst_element_base_class_init (GstElementClass *klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass*) klass;
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gobject_class->set_property = GST_DEBUG_FUNCPTR(gst_element_real_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR(gst_element_real_get_property);
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}
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static void
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gst_element_init (GstElement *element)
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{
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element->current_state = GST_STATE_NULL;
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element->pending_state = GST_STATE_VOID_PENDING;
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element->numpads = 0;
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element->numsrcpads = 0;
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element->numsinkpads = 0;
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element->pads = NULL;
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element->loopfunc = NULL;
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element->sched = NULL;
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element->clock = NULL;
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element->sched_private = NULL;
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element->state_mutex = g_mutex_new ();
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element->state_cond = g_cond_new ();
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}
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static void
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gst_element_real_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstElementClass *oclass = CLASS (object);
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if (oclass->set_property)
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(oclass->set_property) (object, prop_id, value, pspec);
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}
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static void
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gst_element_real_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstElementClass *oclass = CLASS (object);
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if (oclass->get_property)
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(oclass->get_property) (object, prop_id, value, pspec);
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}
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/* Changing a GObject property of an element will result in "deep_notify"
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* signals being emitted by the element itself, as well as in each parent
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* element. This is so that an application can connect a listener to the
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* top-level bin to catch property-change notifications for all contained
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* elements. */
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static void
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gst_element_dispatch_properties_changed (GObject *object,
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guint n_pspecs,
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GParamSpec **pspecs)
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{
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GstObject *gst_object;
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guint i;
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/* do the standard dispatching */
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G_OBJECT_CLASS (parent_class)->dispatch_properties_changed (object, n_pspecs, pspecs);
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/* now let the parent dispatch those, too */
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gst_object = GST_OBJECT_PARENT (object);
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while (gst_object) {
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/* need own category? */
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for (i = 0; i < n_pspecs; i++) {
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GST_DEBUG (GST_CAT_EVENT, "deep notification from %s to %s (%s)", GST_OBJECT_NAME (object),
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GST_OBJECT_NAME (gst_object), pspecs[i]->name);
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g_signal_emit (gst_object, gst_element_signals[DEEP_NOTIFY], g_quark_from_string (pspecs[i]->name),
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(GstObject *) object, pspecs[i]);
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}
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gst_object = GST_OBJECT_PARENT (gst_object);
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}
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}
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typedef struct {
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const GParamSpec *pspec;
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const GValue *value;
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} prop_value_t;
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static void
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element_set_property (GstElement *element, const GParamSpec *pspec, const GValue *value)
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{
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prop_value_t *prop_value = g_new0 (prop_value_t, 1);
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prop_value->pspec = pspec;
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prop_value->value = value;
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g_async_queue_push (element->prop_value_queue, prop_value);
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}
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static void
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element_get_property (GstElement *element, const GParamSpec *pspec, GValue *value)
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{
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g_mutex_lock (element->property_mutex);
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g_object_get_property ((GObject*)element, pspec->name, value);
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g_mutex_unlock (element->property_mutex);
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}
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static void
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gst_element_threadsafe_properties_pre_run (GstElement *element)
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{
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GST_DEBUG (GST_CAT_THREAD, "locking element %s", GST_OBJECT_NAME (element));
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g_mutex_lock (element->property_mutex);
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gst_element_set_pending_properties (element);
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}
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static void
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gst_element_threadsafe_properties_post_run (GstElement *element)
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{
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GST_DEBUG (GST_CAT_THREAD, "unlocking element %s", GST_OBJECT_NAME (element));
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g_mutex_unlock (element->property_mutex);
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}
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void
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gst_element_enable_threadsafe_properties (GstElement *element)
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{
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g_return_if_fail (GST_IS_ELEMENT (element));
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GST_FLAG_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES);
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element->pre_run_func = gst_element_threadsafe_properties_pre_run;
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element->post_run_func = gst_element_threadsafe_properties_post_run;
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if (!element->prop_value_queue)
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element->prop_value_queue = g_async_queue_new ();
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if (!element->property_mutex)
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element->property_mutex = g_mutex_new ();
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}
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void
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gst_element_disable_threadsafe_properties (GstElement *element)
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{
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g_return_if_fail (GST_IS_ELEMENT (element));
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GST_FLAG_UNSET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES);
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element->pre_run_func = NULL;
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element->post_run_func = NULL;
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/* let's keep around that async queue */
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}
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void
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gst_element_set_pending_properties (GstElement *element)
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{
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prop_value_t *prop_value;
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while ((prop_value = g_async_queue_try_pop (element->prop_value_queue))) {
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g_object_set_property ((GObject*)element, prop_value->pspec->name, prop_value->value);
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g_free (prop_value);
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}
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}
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/* following 6 functions taken mostly from gobject.c */
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void
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gst_element_set (GstElement *element, const gchar *first_property_name, ...)
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{
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va_list var_args;
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g_return_if_fail (GST_IS_ELEMENT (element));
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va_start (var_args, first_property_name);
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gst_element_set_valist (element, first_property_name, var_args);
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va_end (var_args);
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}
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void
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gst_element_get (GstElement *element, const gchar *first_property_name, ...)
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{
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va_list var_args;
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g_return_if_fail (GST_IS_ELEMENT (element));
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va_start (var_args, first_property_name);
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gst_element_get_valist (element, first_property_name, var_args);
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va_end (var_args);
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}
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void
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gst_element_set_valist (GstElement *element, const gchar *first_property_name, va_list var_args)
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{
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const gchar *name;
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GObject *object;
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g_return_if_fail (GST_IS_ELEMENT (element));
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object = (GObject*)element;
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if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
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g_object_set_valist (object, first_property_name, var_args);
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return;
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}
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g_object_ref (object);
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name = first_property_name;
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while (name)
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{
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GValue value = { 0, };
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GParamSpec *pspec;
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gchar *error = NULL;
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pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
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if (!pspec)
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{
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g_warning ("%s: object class `%s' has no property named `%s'",
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G_STRLOC,
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G_OBJECT_TYPE_NAME (object),
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name);
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break;
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}
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if (!(pspec->flags & G_PARAM_WRITABLE))
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{
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g_warning ("%s: property `%s' of object class `%s' is not writable",
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G_STRLOC,
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pspec->name,
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G_OBJECT_TYPE_NAME (object));
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break;
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}
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g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
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G_VALUE_COLLECT (&value, var_args, 0, &error);
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if (error)
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{
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g_warning ("%s: %s", G_STRLOC, error);
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g_free (error);
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|
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/* we purposely leak the value here, it might not be
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* in a sane state if an error condition occoured
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*/
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break;
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}
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element_set_property (element, pspec, &value);
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g_value_unset (&value);
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name = va_arg (var_args, gchar*);
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}
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g_object_unref (object);
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}
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|
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void
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gst_element_get_valist (GstElement *element, const gchar *first_property_name, va_list var_args)
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{
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const gchar *name;
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GObject *object;
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g_return_if_fail (GST_IS_ELEMENT (element));
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object = (GObject*)element;
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|
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if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
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g_object_get_valist (object, first_property_name, var_args);
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return;
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}
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g_object_ref (object);
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name = first_property_name;
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while (name)
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{
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GValue value = { 0, };
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GParamSpec *pspec;
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gchar *error;
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pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
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if (!pspec)
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{
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g_warning ("%s: object class `%s' has no property named `%s'",
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G_STRLOC,
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G_OBJECT_TYPE_NAME (object),
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name);
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break;
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}
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if (!(pspec->flags & G_PARAM_READABLE))
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{
|
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g_warning ("%s: property `%s' of object class `%s' is not readable",
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G_STRLOC,
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pspec->name,
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G_OBJECT_TYPE_NAME (object));
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break;
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}
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g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
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element_get_property (element, pspec, &value);
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G_VALUE_LCOPY (&value, var_args, 0, &error);
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if (error)
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{
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g_warning ("%s: %s", G_STRLOC, error);
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g_free (error);
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g_value_unset (&value);
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break;
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}
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g_value_unset (&value);
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|
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name = va_arg (var_args, gchar*);
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}
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|
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g_object_unref (object);
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}
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|
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void
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gst_element_set_property (GstElement *element, const gchar *property_name, const GValue *value)
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{
|
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GParamSpec *pspec;
|
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GObject *object;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (G_IS_VALUE (value));
|
|
|
|
object = (GObject*)element;
|
|
|
|
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
|
|
g_object_set_property (object, property_name, value);
|
|
return;
|
|
}
|
|
|
|
g_object_ref (object);
|
|
|
|
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), property_name);
|
|
|
|
if (!pspec)
|
|
g_warning ("%s: object class `%s' has no property named `%s'",
|
|
G_STRLOC,
|
|
G_OBJECT_TYPE_NAME (object),
|
|
property_name);
|
|
else
|
|
element_set_property (element, pspec, value);
|
|
|
|
g_object_unref (object);
|
|
}
|
|
|
|
void
|
|
gst_element_get_property (GstElement *element, const gchar *property_name, GValue *value)
|
|
{
|
|
GParamSpec *pspec;
|
|
GObject *object;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (G_IS_VALUE (value));
|
|
|
|
object = (GObject*)element;
|
|
|
|
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
|
|
g_object_get_property (object, property_name, value);
|
|
return;
|
|
}
|
|
|
|
g_object_ref (object);
|
|
|
|
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), property_name);
|
|
|
|
if (!pspec)
|
|
g_warning ("%s: object class `%s' has no property named `%s'",
|
|
G_STRLOC,
|
|
G_OBJECT_TYPE_NAME (object),
|
|
property_name);
|
|
else
|
|
{
|
|
GValue *prop_value, tmp_value = { 0, };
|
|
|
|
/* auto-conversion of the callers value type
|
|
*/
|
|
if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec))
|
|
{
|
|
g_value_reset (value);
|
|
prop_value = value;
|
|
}
|
|
else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value)))
|
|
{
|
|
g_warning ("can't retrieve property `%s' of type `%s' as value of type `%s'",
|
|
pspec->name,
|
|
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
|
|
G_VALUE_TYPE_NAME (value));
|
|
g_object_unref (object);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
|
|
prop_value = &tmp_value;
|
|
}
|
|
element_get_property (element, pspec, prop_value);
|
|
if (prop_value != value)
|
|
{
|
|
g_value_transform (prop_value, value);
|
|
g_value_unset (&tmp_value);
|
|
}
|
|
}
|
|
|
|
g_object_unref (object);
|
|
}
|
|
|
|
static GstPad*
|
|
gst_element_request_pad (GstElement *element, GstPadTemplate *templ, const gchar* name)
|
|
{
|
|
GstPad *newpad = NULL;
|
|
GstElementClass *oclass;
|
|
|
|
oclass = CLASS (element);
|
|
if (oclass->request_new_pad)
|
|
newpad = (oclass->request_new_pad)(element, templ, name);
|
|
|
|
return newpad;
|
|
}
|
|
|
|
void
|
|
gst_element_release_request_pad (GstElement *element, GstPad *pad)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
oclass = CLASS (element);
|
|
if (oclass->release_pad)
|
|
(oclass->release_pad) (element, pad);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_set_name:
|
|
* @element: a #GstElement to set name of
|
|
* @name: new name of element
|
|
*
|
|
* Sets the name of the element, getting rid of the old name if there was
|
|
* one.
|
|
*/
|
|
void
|
|
gst_element_set_name (GstElement *element, const gchar *name)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
gst_object_set_name (GST_OBJECT (element), name);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_name:
|
|
* @element: a #GstElement to get name of
|
|
*
|
|
* Gets the name of the element.
|
|
*
|
|
* Returns: name of the element
|
|
*/
|
|
const gchar*
|
|
gst_element_get_name (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return GST_OBJECT_NAME (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_parent:
|
|
* @element: a #GstElement to set parent of
|
|
* @parent: new parent of the object
|
|
*
|
|
* Sets the parent of the element.
|
|
*/
|
|
void
|
|
gst_element_set_parent (GstElement *element, GstObject *parent)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_OBJECT_PARENT (element) == NULL);
|
|
g_return_if_fail (parent != NULL);
|
|
g_return_if_fail (GST_IS_OBJECT (parent));
|
|
g_return_if_fail ((gpointer)element != (gpointer)parent);
|
|
|
|
gst_object_set_parent (GST_OBJECT (element), parent);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_parent:
|
|
* @element: a #GstElement to get the parent of
|
|
*
|
|
* Gets the parent of the element.
|
|
*
|
|
* Returns: the #GstElement parent of the element
|
|
*/
|
|
GstObject*
|
|
gst_element_get_parent (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return GST_OBJECT_PARENT (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_clock:
|
|
* @element: a #GstElement to set the clock for
|
|
* @clock: the #GstClock to set for the element
|
|
*
|
|
* Sets the clock for the element.
|
|
*/
|
|
void
|
|
gst_element_set_clock (GstElement *element, GstClock *clock)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
if (element->setclockfunc)
|
|
element->setclockfunc (element, clock);
|
|
|
|
element->clock = clock;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_clock:
|
|
* @element: a #GstElement to get the clock of
|
|
*
|
|
* Gets the clock of the element.
|
|
*
|
|
* Returns: the #GstClock of the element.
|
|
*/
|
|
GstClock*
|
|
gst_element_get_clock (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
if (element->getclockfunc)
|
|
return element->getclockfunc (element);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_element_clock_wait:
|
|
* @element: a #GstElement
|
|
* @clock: the #GstClock to use
|
|
* @time: the #GstClockTime to wait for on the clock
|
|
*
|
|
* Waits for a specific time on the clock.
|
|
*
|
|
* Returns: the #GstClockReturn result of the wait operation
|
|
*/
|
|
GstClockReturn
|
|
gst_element_clock_wait (GstElement *element, GstClock *clock, GstClockTime time, GstClockTimeDiff *jitter)
|
|
{
|
|
GstClockReturn res;
|
|
|
|
g_return_val_if_fail (element != NULL, GST_CLOCK_ERROR);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_ERROR);
|
|
|
|
if (GST_ELEMENT_SCHED (element)) {
|
|
res = gst_scheduler_clock_wait (GST_ELEMENT_SCHED (element), element, clock, time, jitter);
|
|
}
|
|
else
|
|
res = GST_CLOCK_TIMEOUT;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_release_locks:
|
|
* @element: an element
|
|
*
|
|
* Instruct the element to release all the locks it is holding, ex
|
|
* blocking reads, waiting for the clock, ...
|
|
*
|
|
* Returns: TRUE if the locks could be released.
|
|
*/
|
|
gboolean
|
|
gst_element_release_locks (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
if (CLASS (element)->release_locks)
|
|
return CLASS (element)->release_locks (element);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_add_pad:
|
|
* @element: element to add pad to
|
|
* @pad: pad to add
|
|
*
|
|
* Add a pad (connection point) to the element, setting the parent of the
|
|
* pad to the element (and thus adding a reference).
|
|
*/
|
|
void
|
|
gst_element_add_pad (GstElement *element, GstPad *pad)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (pad != NULL);
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
/* first check to make sure the pad's parent is already set */
|
|
g_return_if_fail (GST_PAD_PARENT (pad) == NULL);
|
|
|
|
/* then check to see if there's already a pad by that name here */
|
|
g_return_if_fail (gst_object_check_uniqueness (element->pads, GST_PAD_NAME(pad)) == TRUE);
|
|
|
|
/* set the pad's parent */
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS,"setting parent of pad '%s' to '%s'",
|
|
GST_PAD_NAME (pad), GST_ELEMENT_NAME (element));
|
|
gst_object_set_parent (GST_OBJECT (pad), GST_OBJECT (element));
|
|
|
|
/* add it to the list */
|
|
element->pads = g_list_append (element->pads, pad);
|
|
element->numpads++;
|
|
if (gst_pad_get_direction (pad) == GST_PAD_SRC)
|
|
element->numsrcpads++;
|
|
else
|
|
element->numsinkpads++;
|
|
|
|
/* emit the NEW_PAD signal */
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, pad);
|
|
}
|
|
|
|
/**
|
|
* gst_element_remove_pad:
|
|
* @element: element to remove pad from
|
|
* @pad: pad to remove
|
|
*
|
|
* Remove a pad (connection point) from the element,
|
|
*/
|
|
void
|
|
gst_element_remove_pad (GstElement *element, GstPad *pad)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (pad != NULL);
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
g_return_if_fail (GST_PAD_PARENT (pad) == element);
|
|
|
|
/* check to see if the pad is still connected */
|
|
/* FIXME: what if someone calls _remove_pad instead of
|
|
_remove_ghost_pad? */
|
|
if (GST_IS_REAL_PAD (pad)) {
|
|
g_return_if_fail (GST_RPAD_PEER (pad) == NULL);
|
|
}
|
|
|
|
/* remove it from the list */
|
|
element->pads = g_list_remove (element->pads, pad);
|
|
element->numpads--;
|
|
if (gst_pad_get_direction (pad) == GST_PAD_SRC)
|
|
element->numsrcpads--;
|
|
else
|
|
element->numsinkpads--;
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[PAD_REMOVED], 0, pad);
|
|
|
|
gst_object_unparent (GST_OBJECT (pad));
|
|
}
|
|
|
|
/**
|
|
* gst_element_add_ghost_pad:
|
|
* @element: element to add ghost pad to
|
|
* @pad: pad from which the new ghost pad will be created
|
|
* @name: name of the new ghost pad
|
|
*
|
|
* Create a ghost pad from the given pad, and add it to the list of pads
|
|
* for this element.
|
|
*
|
|
* Returns: the added ghost pad or NULL, if no ghost pad was created.
|
|
*/
|
|
GstPad *
|
|
gst_element_add_ghost_pad (GstElement *element, GstPad *pad, gchar *name)
|
|
{
|
|
GstPad *ghostpad;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (pad != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
/* then check to see if there's already a pad by that name here */
|
|
g_return_val_if_fail (gst_object_check_uniqueness (element->pads, name) == TRUE, NULL);
|
|
|
|
GST_DEBUG(GST_CAT_ELEMENT_PADS,"creating new ghost pad called %s, from pad %s:%s",
|
|
name,GST_DEBUG_PAD_NAME(pad));
|
|
ghostpad = gst_ghost_pad_new (name, pad);
|
|
|
|
/* add it to the list */
|
|
GST_DEBUG(GST_CAT_ELEMENT_PADS,"adding ghost pad %s to element %s",
|
|
name, GST_ELEMENT_NAME (element));
|
|
element->pads = g_list_append (element->pads, ghostpad);
|
|
element->numpads++;
|
|
/* set the parent of the ghostpad */
|
|
gst_object_set_parent (GST_OBJECT (ghostpad), GST_OBJECT (element));
|
|
|
|
GST_DEBUG(GST_CAT_ELEMENT_PADS,"added ghostpad %s:%s",GST_DEBUG_PAD_NAME(ghostpad));
|
|
|
|
/* emit the NEW_GHOST_PAD signal */
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, ghostpad);
|
|
|
|
return ghostpad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_remove_ghost_pad:
|
|
* @element: element to remove the ghost pad from
|
|
* @pad: ghost pad to remove
|
|
*
|
|
* removes a ghost pad from an element
|
|
*/
|
|
void
|
|
gst_element_remove_ghost_pad (GstElement *element, GstPad *pad)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (pad != NULL);
|
|
g_return_if_fail (GST_IS_GHOST_PAD (pad));
|
|
|
|
/* FIXME this is redundant?
|
|
* wingo 10-july-2001: I don't think so, you have to actually remove the pad
|
|
* from the element. gst_pad_remove_ghost_pad just removes the ghostpad from
|
|
* the real pad's ghost pad list
|
|
*/
|
|
gst_pad_remove_ghost_pad (GST_PAD (GST_PAD_REALIZE (pad)), pad);
|
|
gst_element_remove_pad (element, pad);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_get_pad:
|
|
* @element: element to find pad of
|
|
* @name: name of pad to retrieve
|
|
*
|
|
* Retrieve a pad from the element by name.
|
|
*
|
|
* Returns: requested pad if found, otherwise NULL.
|
|
*/
|
|
GstPad*
|
|
gst_element_get_pad (GstElement *element, const gchar *name)
|
|
{
|
|
GstPad *pad;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
if ((pad = gst_element_get_static_pad (element, name)))
|
|
return pad;
|
|
|
|
pad = gst_element_get_request_pad (element, name);
|
|
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_static_pad:
|
|
* @element: element to find pad of
|
|
* @name: name of pad to retrieve
|
|
*
|
|
* Retrieve a pad from the element by name. This version only retrieves
|
|
* already-existing (i.e. 'static') pads.
|
|
*
|
|
* Returns: requested pad if found, otherwise NULL.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_static_pad (GstElement *element, const gchar *name)
|
|
{
|
|
GList *walk;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
walk = element->pads;
|
|
while (walk) {
|
|
GstPad *pad;
|
|
|
|
pad = GST_PAD(walk->data);
|
|
if (strcmp (GST_PAD_NAME(pad), name) == 0) {
|
|
GST_INFO (GST_CAT_ELEMENT_PADS, "found pad %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
return pad;
|
|
}
|
|
walk = g_list_next (walk);
|
|
}
|
|
|
|
GST_INFO (GST_CAT_ELEMENT_PADS, "no such pad '%s' in element \"%s\"", name, GST_OBJECT_NAME (element));
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_request_pad:
|
|
* @element: element to find pad of
|
|
* @name: name of pad to retrieve
|
|
*
|
|
* Retrieve a pad from the element by name. This version only retrieves
|
|
* request pads.
|
|
*
|
|
* Returns: requested pad if found, otherwise NULL.
|
|
*/
|
|
GstPad*
|
|
gst_element_get_request_pad (GstElement *element, const gchar *name)
|
|
{
|
|
GstPadTemplate *templ = NULL;
|
|
GstPad *pad;
|
|
const gchar *req_name = NULL;
|
|
gboolean templ_found = FALSE;
|
|
GList *list;
|
|
gint n;
|
|
const gchar *data;
|
|
gchar *str, *endptr = NULL;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
if (strstr (name, "%")) {
|
|
templ = gst_element_get_pad_template (element, name);
|
|
req_name = NULL;
|
|
if (templ)
|
|
templ_found = TRUE;
|
|
} else {
|
|
list = gst_element_get_pad_template_list(element);
|
|
while (!templ_found && list) {
|
|
templ = (GstPadTemplate*) list->data;
|
|
if (templ->presence == GST_PAD_REQUEST) {
|
|
/* we know that %s and %d are the only possibilities because of sanity
|
|
checks in gst_pad_template_new */
|
|
GST_DEBUG (GST_CAT_PADS, "comparing %s to %s", name, templ->name_template);
|
|
if ((str = strchr (templ->name_template, '%')) &&
|
|
strncmp (templ->name_template, name, str - templ->name_template) == 0 &&
|
|
strlen (name) > str - templ->name_template) {
|
|
data = name + (str - templ->name_template);
|
|
if (*(str+1) == 'd') {
|
|
/* it's an int */
|
|
n = (gint) strtol (data, &endptr, 10);
|
|
if (endptr && *endptr == '\0') {
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
} else {
|
|
/* it's a string */
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
list = list->next;
|
|
}
|
|
}
|
|
|
|
if (!templ_found)
|
|
return NULL;
|
|
|
|
pad = gst_element_request_pad (element, templ, req_name);
|
|
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_pad_list:
|
|
* @element: element to get pads of
|
|
*
|
|
* Retrieve a list of the pads associated with the element.
|
|
*
|
|
* Returns: GList of pads
|
|
*/
|
|
GList*
|
|
gst_element_get_pad_list (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
/* return the list of pads */
|
|
return element->pads;
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_add_pad_template:
|
|
* @klass: element class to add padtemplate to
|
|
* @templ: padtemplate to add
|
|
*
|
|
* Add a padtemplate to an element class. This is useful if you have derived a custom
|
|
* bin and wish to provide an on-request pad at runtime. Plugin writers should use
|
|
* gst_element_factory_add_pad_template instead.
|
|
*/
|
|
void
|
|
gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ)
|
|
{
|
|
g_return_if_fail (klass != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (templ != NULL);
|
|
g_return_if_fail (GST_IS_PAD_TEMPLATE (templ));
|
|
|
|
klass->padtemplates = g_list_append (klass->padtemplates, templ);
|
|
klass->numpadtemplates++;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_pad_template_list:
|
|
* @element: element to get padtemplates of
|
|
*
|
|
* Retrieve a list of the padtemplates associated with the element.
|
|
*
|
|
* Returns: GList of padtemplates
|
|
*/
|
|
GList*
|
|
gst_element_get_pad_template_list (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return CLASS (element)->padtemplates;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_pad_template:
|
|
* @element: element to get padtemplate of
|
|
* @name: the name of the padtemplate to get.
|
|
*
|
|
* Retrieve a padtemplate from this element with the
|
|
* given name.
|
|
*
|
|
* Returns: the padtemplate with the given name. No unreferencing is necessary.
|
|
*/
|
|
GstPadTemplate*
|
|
gst_element_get_pad_template (GstElement *element, const guchar *name)
|
|
{
|
|
GList *padlist;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
padlist = gst_element_get_pad_template_list (element);
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate*) padlist->data;
|
|
|
|
if (!strcmp (padtempl->name_template, name))
|
|
return padtempl;
|
|
|
|
padlist = g_list_next (padlist);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_compatible_pad_template:
|
|
* @element: element to get padtemplate of
|
|
* @templ: a template to find a compatible template for
|
|
*
|
|
* Generate a padtemplate for this element compatible with the given
|
|
* template, ie able to link to it.
|
|
*
|
|
* Returns: the padtemplate. No unreferencing is necessary.
|
|
*/
|
|
GstPadTemplate*
|
|
gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl)
|
|
{
|
|
GstPadTemplate *newtempl = NULL;
|
|
GList *padlist;
|
|
|
|
GST_DEBUG(GST_CAT_ELEMENT_PADS,"gst_element_get_pad_template_by_compatible()");
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (compattempl != NULL, NULL);
|
|
|
|
padlist = gst_element_get_pad_template_list (element);
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate*) padlist->data;
|
|
gboolean compat = FALSE;
|
|
|
|
/* Ignore name
|
|
* Ignore presence
|
|
* Check direction (must be opposite)
|
|
* Check caps
|
|
*/
|
|
GST_DEBUG(GST_CAT_CAPS,"checking direction and caps");
|
|
if (padtempl->direction == GST_PAD_SRC &&
|
|
compattempl->direction == GST_PAD_SINK) {
|
|
GST_DEBUG(GST_CAT_CAPS,"compatible direction: found src pad template");
|
|
compat = gst_caps_check_compatibility(GST_PAD_TEMPLATE_CAPS (padtempl),
|
|
GST_PAD_TEMPLATE_CAPS (compattempl));
|
|
GST_DEBUG(GST_CAT_CAPS,"caps are %scompatible", (compat?"":"not "));
|
|
} else if (padtempl->direction == GST_PAD_SINK &&
|
|
compattempl->direction == GST_PAD_SRC) {
|
|
GST_DEBUG(GST_CAT_CAPS,"compatible direction: found sink pad template");
|
|
compat = gst_caps_check_compatibility(GST_PAD_TEMPLATE_CAPS (compattempl),
|
|
GST_PAD_TEMPLATE_CAPS (padtempl));
|
|
GST_DEBUG(GST_CAT_CAPS,"caps are %scompatible", (compat?"":"not "));
|
|
}
|
|
|
|
if (compat) {
|
|
newtempl = padtempl;
|
|
break;
|
|
}
|
|
|
|
padlist = g_list_next (padlist);
|
|
}
|
|
|
|
return newtempl;
|
|
}
|
|
|
|
/**
|
|
* gst_element_request_compatible_pad:
|
|
* @element: element to request a new pad from
|
|
* @templ: a pad template to which the new pad should be able to connect
|
|
*
|
|
* Request a new pad from the element. The template will
|
|
* be used to decide what type of pad to create. This function
|
|
* is typically used for elements with a padtemplate with presence
|
|
* GST_PAD_REQUEST.
|
|
*
|
|
* Returns: the new pad that was created.
|
|
*/
|
|
GstPad*
|
|
gst_element_request_compatible_pad (GstElement *element, GstPadTemplate *templ)
|
|
{
|
|
GstPadTemplate *templ_new;
|
|
GstPad *pad = NULL;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (templ != NULL, NULL);
|
|
|
|
templ_new = gst_element_get_compatible_pad_template (element, templ);
|
|
if (templ_new != NULL)
|
|
pad = gst_element_request_pad (element, templ_new, NULL);
|
|
|
|
return pad;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_get_compatible_pad_filtered:
|
|
* @element: the element in which the pad should be found
|
|
* @pad: the pad to find a compatible one for
|
|
* @filtercaps: the caps to use as a filter
|
|
*
|
|
* Looks for an unconnected pad to which the given pad can connect to.
|
|
* It is not guaranteed that connecting the pads will work, though
|
|
* it should work in most cases.
|
|
*
|
|
* Returns: the pad to which a connection can be made
|
|
*/
|
|
GstPad*
|
|
gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad, GstCaps *filtercaps)
|
|
{
|
|
GList *pads;
|
|
GstPadTemplate *templ;
|
|
GstCaps *templcaps;
|
|
GstPad *foundpad = NULL;
|
|
|
|
/* checks */
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (pad != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
/* let's use the real pad */
|
|
pad = (GstPad *) GST_PAD_REALIZE (pad);
|
|
g_return_val_if_fail (pad != NULL, NULL);
|
|
g_return_val_if_fail (GST_RPAD_PEER (pad) == NULL, NULL);
|
|
|
|
/* try to get an existing unconnected pad */
|
|
pads = gst_element_get_pad_list (element);
|
|
while (pads) {
|
|
GstPad *current = GST_PAD (pads->data);
|
|
if ((GST_PAD_PEER (GST_PAD_REALIZE (current)) == NULL) &&
|
|
gst_pad_can_connect_filtered (pad, current, filtercaps)) {
|
|
return current;
|
|
}
|
|
pads = g_list_next (pads);
|
|
}
|
|
|
|
/* try to create a new one */
|
|
/* requesting is a little crazy, we need a template. Let's create one */
|
|
if (filtercaps != NULL) {
|
|
templcaps = gst_caps_intersect (filtercaps, (GstCaps *) GST_RPAD_CAPS (pad));
|
|
if (templcaps == NULL)
|
|
return NULL;
|
|
} else {
|
|
templcaps = gst_caps_copy (gst_pad_get_caps (pad));
|
|
}
|
|
|
|
templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad), GST_RPAD_DIRECTION (pad),
|
|
GST_PAD_ALWAYS, templcaps, NULL);
|
|
foundpad = gst_element_request_compatible_pad (element, templ);
|
|
gst_object_unref (GST_OBJECT (templ)); /* this will take care of the caps too */
|
|
|
|
/* FIXME: this is broken, but it's in here so autoplugging elements that don't
|
|
have caps on their source padtemplates (spider) can connect... */
|
|
if (!foundpad && !filtercaps) {
|
|
templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad), GST_RPAD_DIRECTION (pad),
|
|
GST_PAD_ALWAYS, NULL, NULL);
|
|
foundpad = gst_element_request_compatible_pad (element, templ);
|
|
gst_object_unref (GST_OBJECT (templ));
|
|
}
|
|
|
|
return foundpad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_compatible_pad:
|
|
* @element: the element in which the pad should be found
|
|
* @pad: the pad to find a compatible one for
|
|
*
|
|
* Looks for an unconnected pad to which the given pad can connect to.
|
|
* It is not guaranteed that connecting the pads will work, though
|
|
* it should work in most cases.
|
|
*
|
|
* Returns: the pad to which a connection can be made
|
|
*/
|
|
GstPad*
|
|
gst_element_get_compatible_pad (GstElement *element, GstPad *pad)
|
|
{
|
|
return gst_element_get_compatible_pad_filtered (element, pad, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_element_connect_filtered:
|
|
* @src: the element containing source pad
|
|
* @dest: the element containing destination pad
|
|
* @filtercaps: the caps to use as filter
|
|
*
|
|
* Connect the source to the destination element using the filtercaps.
|
|
* The connection must be from source to destination, the other
|
|
* direction will not be tried.
|
|
* The functions looks for existing pads that aren't connected yet.
|
|
+ It will use request pads if possible. But both pads will not be requested.
|
|
* If multiple connections are possible, only one is established.
|
|
*
|
|
* Returns: TRUE if the elements could be connected.
|
|
*/
|
|
gboolean
|
|
gst_element_connect_filtered (GstElement *src, GstElement *dest,
|
|
GstCaps *filtercaps)
|
|
{
|
|
GList *srcpads, *destpads, *srctempls, *desttempls, *l;
|
|
GstPad *srcpad, *destpad;
|
|
GstPadTemplate *srctempl, *desttempl;
|
|
|
|
/* checks */
|
|
g_return_val_if_fail (src != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT(src), FALSE);
|
|
g_return_val_if_fail (dest != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT(dest), FALSE);
|
|
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS, "attempting to connect element %s to element %s", GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
|
|
|
|
/* loop through the existing pads in the source */
|
|
srcpads = gst_element_get_pad_list (src);
|
|
destpads = gst_element_get_pad_list (dest);
|
|
|
|
if (srcpads || destpads) {
|
|
while (srcpads) {
|
|
srcpad = (GstPad *) GST_PAD_REALIZE (srcpads->data);
|
|
if ((GST_RPAD_DIRECTION (srcpad) == GST_PAD_SRC) &&
|
|
(GST_PAD_PEER (srcpad) == NULL)) {
|
|
destpad = gst_element_get_compatible_pad_filtered (dest, srcpad, filtercaps);
|
|
if (destpad && gst_pad_connect_filtered (srcpad, destpad, filtercaps)) {
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS, "connected pad %s:%s to pad %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
|
|
return TRUE;
|
|
}
|
|
}
|
|
srcpads = g_list_next (srcpads);
|
|
}
|
|
|
|
/* loop through the existing pads in the destination */
|
|
while (destpads) {
|
|
destpad = (GstPad *) GST_PAD_REALIZE (destpads->data);
|
|
if ((GST_RPAD_DIRECTION (destpad) == GST_PAD_SINK) &&
|
|
(GST_PAD_PEER (destpad) == NULL)) {
|
|
srcpad = gst_element_get_compatible_pad_filtered (src, destpad, filtercaps);
|
|
if (srcpad && gst_pad_connect_filtered (srcpad, destpad, filtercaps)) {
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS, "connected pad %s:%s to pad %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
|
|
return TRUE;
|
|
}
|
|
}
|
|
destpads = g_list_next (destpads);
|
|
}
|
|
}
|
|
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS, "we might have request pads on both sides, checking...");
|
|
srctempls = gst_element_get_pad_template_list (src);
|
|
desttempls = gst_element_get_pad_template_list (dest);
|
|
|
|
if (srctempls && desttempls) {
|
|
while (srctempls) {
|
|
srctempl = (GstPadTemplate*) srctempls->data;
|
|
if (srctempl->presence == GST_PAD_REQUEST) {
|
|
for (l=desttempls; l; l=l->next) {
|
|
desttempl = (GstPadTemplate*) desttempls->data;
|
|
if (desttempl->presence == GST_PAD_REQUEST && desttempl->direction != srctempl->direction) {
|
|
if (gst_caps_check_compatibility (gst_pad_template_get_caps (srctempl),
|
|
gst_pad_template_get_caps (desttempl))) {
|
|
srcpad = gst_element_get_request_pad (src, srctempl->name_template);
|
|
destpad = gst_element_get_request_pad (dest, desttempl->name_template);
|
|
if (gst_pad_connect_filtered (srcpad, destpad, filtercaps)) {
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS, "connected pad %s:%s to pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
|
|
return TRUE;
|
|
}
|
|
/* FIXME: we have extraneous request pads lying around */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
srctempls = srctempls->next;
|
|
}
|
|
}
|
|
|
|
GST_DEBUG (GST_CAT_ELEMENT_PADS, "no connection possible from %s to %s", GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_connect_many:
|
|
* @element_1: the first element in the connection chain
|
|
* @element_2: the second element in the connection chain
|
|
* @...: NULL-terminated list of elements to connect in order
|
|
*
|
|
* Chain together a series of elements. Uses #gst_element_connect.
|
|
*
|
|
* Returns: TRUE on success, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_element_connect_many (GstElement *element_1, GstElement *element_2, ...)
|
|
{
|
|
va_list args;
|
|
|
|
g_return_val_if_fail (element_1 != NULL && element_2 != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2), FALSE);
|
|
|
|
va_start (args, element_2);
|
|
|
|
while (element_2) {
|
|
if (!gst_element_connect (element_1, element_2))
|
|
return FALSE;
|
|
|
|
element_1 = element_2;
|
|
element_2 = va_arg (args, GstElement*);
|
|
}
|
|
|
|
va_end (args);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_connect:
|
|
* @src: element containing source pad
|
|
* @dest: element containing destination pad
|
|
*
|
|
* Connect the source to the destination element.
|
|
* The connection must be from source to destination, the other
|
|
* direction will not be tried.
|
|
* The functions looks for existing pads and request pads that aren't
|
|
* connected yet. If multiple connections are possible, only one is
|
|
* established.
|
|
*
|
|
* Returns: TRUE if the elements could be connected.
|
|
*/
|
|
gboolean
|
|
gst_element_connect (GstElement *src, GstElement *dest)
|
|
{
|
|
return gst_element_connect_filtered (src, dest, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_element_connect_pads_filtered:
|
|
* @src: element containing source pad
|
|
* @srcpadname: name of pad in source element
|
|
* @dest: element containing destination pad
|
|
* @destpadname: name of pad in destination element
|
|
* @filtercaps: the caps to use as a filter
|
|
*
|
|
* Connect the two named pads of the source and destination elements.
|
|
* Side effect is that if one of the pads has no parent, it becomes a
|
|
* child of the parent of the other element. If they have different
|
|
* parents, the connection fails.
|
|
*
|
|
* Returns: TRUE if the pads could be connected.
|
|
*/
|
|
gboolean
|
|
gst_element_connect_pads_filtered (GstElement *src, const gchar *srcpadname,
|
|
GstElement *dest, const gchar *destpadname,
|
|
GstCaps *filtercaps)
|
|
{
|
|
GstPad *srcpad,*destpad;
|
|
|
|
g_return_val_if_fail (src != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
|
|
g_return_val_if_fail (srcpadname != NULL, FALSE);
|
|
g_return_val_if_fail (dest != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
|
|
g_return_val_if_fail (destpadname != NULL, FALSE);
|
|
|
|
/* obtain the pads requested */
|
|
srcpad = gst_element_get_pad (src, srcpadname);
|
|
if (srcpad == NULL) {
|
|
GST_ERROR (src, "source element has no pad \"%s\"", srcpadname);
|
|
return FALSE;
|
|
}
|
|
destpad = gst_element_get_pad (dest, destpadname);
|
|
if (srcpad == NULL) {
|
|
GST_ERROR (dest, "destination element has no pad \"%s\"", destpadname);
|
|
return FALSE;
|
|
}
|
|
|
|
/* we're satisified they can be connected, let's do it */
|
|
return gst_pad_connect_filtered (srcpad, destpad, filtercaps);
|
|
}
|
|
|
|
/**
|
|
* gst_element_connect_pads:
|
|
* @src: element containing source pad
|
|
* @srcpadname: name of pad in source element
|
|
* @dest: element containing destination pad
|
|
* @destpadname: name of pad in destination element
|
|
*
|
|
* Connect the two named pads of the source and destination elements.
|
|
* Side effect is that if one of the pads has no parent, it becomes a
|
|
* child of the parent of the other element. If they have different
|
|
* parents, the connection fails.
|
|
*
|
|
* Returns: TRUE if the pads could be connected.
|
|
*/
|
|
gboolean
|
|
gst_element_connect_pads (GstElement *src, const gchar *srcpadname,
|
|
GstElement *dest, const gchar *destpadname)
|
|
{
|
|
return gst_element_connect_pads_filtered (src, srcpadname, dest, destpadname, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_element_disconnect_pads:
|
|
* @src: element containing source pad
|
|
* @srcpadname: name of pad in source element
|
|
* @dest: element containing destination pad
|
|
* @destpadname: name of pad in destination element
|
|
*
|
|
* Disconnect the two named pads of the source and destination elements.
|
|
*/
|
|
void
|
|
gst_element_disconnect_pads (GstElement *src, const gchar *srcpadname,
|
|
GstElement *dest, const gchar *destpadname)
|
|
{
|
|
GstPad *srcpad,*destpad;
|
|
|
|
g_return_if_fail (src != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT(src));
|
|
g_return_if_fail (srcpadname != NULL);
|
|
g_return_if_fail (dest != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT(dest));
|
|
g_return_if_fail (destpadname != NULL);
|
|
|
|
/* obtain the pads requested */
|
|
srcpad = gst_element_get_pad (src, srcpadname);
|
|
if (srcpad == NULL) {
|
|
GST_ERROR(src,"source element has no pad \"%s\"",srcpadname);
|
|
return;
|
|
}
|
|
destpad = gst_element_get_pad (dest, destpadname);
|
|
if (srcpad == NULL) {
|
|
GST_ERROR(dest,"destination element has no pad \"%s\"",destpadname);
|
|
return;
|
|
}
|
|
|
|
/* we're satisified they can be disconnected, let's do it */
|
|
gst_pad_disconnect(srcpad,destpad);
|
|
}
|
|
|
|
/**
|
|
* gst_element_disconnect_many:
|
|
* @element_1: the first element in the connection chain
|
|
* @element_2: the second element in the connection chain
|
|
* @...: NULL-terminated list of elements to disconnect in order
|
|
*
|
|
* Disconnect a series of elements. Uses #gst_element_disconnect.
|
|
*/
|
|
void
|
|
gst_element_disconnect_many (GstElement *element_1, GstElement *element_2, ...)
|
|
{
|
|
va_list args;
|
|
|
|
g_return_if_fail (element_1 != NULL && element_2 != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2));
|
|
|
|
va_start (args, element_2);
|
|
|
|
while (element_2) {
|
|
gst_element_disconnect (element_1, element_2);
|
|
|
|
element_1 = element_2;
|
|
element_2 = va_arg (args, GstElement*);
|
|
}
|
|
|
|
va_end (args);
|
|
}
|
|
|
|
/**
|
|
* gst_element_disconnect:
|
|
* @src: source element
|
|
* @dest: sink element
|
|
*
|
|
* Disconnect all pads connecting the two elements in the direction src -> dest.
|
|
*/
|
|
void
|
|
gst_element_disconnect (GstElement *src, GstElement *dest)
|
|
{
|
|
GList *srcpads;
|
|
GstPad *pad;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT(src));
|
|
g_return_if_fail (GST_IS_ELEMENT(dest));
|
|
|
|
srcpads = gst_element_get_pad_list (src);
|
|
|
|
while (srcpads) {
|
|
pad = GST_PAD_CAST (srcpads->data);
|
|
|
|
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC)
|
|
if (GST_OBJECT_PARENT (GST_PAD_PEER (pad)) == (GstObject*) dest)
|
|
gst_pad_disconnect (pad, GST_PAD_PEER (pad));
|
|
|
|
srcpads = g_list_next (srcpads);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_element_error_func (GstElement* element, GstElement *source, gchar *errormsg)
|
|
{
|
|
/* tell the parent */
|
|
if (GST_OBJECT_PARENT (element)) {
|
|
GST_DEBUG (GST_CAT_EVENT, "forwarding error \"%s\" from %s to %s", errormsg,
|
|
GST_ELEMENT_NAME (element), GST_OBJECT_NAME (GST_OBJECT_PARENT (element)));
|
|
|
|
gst_object_ref (GST_OBJECT (element));
|
|
g_signal_emit (G_OBJECT (GST_OBJECT_PARENT (element)), gst_element_signals[ERROR], 0, source, errormsg);
|
|
gst_object_unref (GST_OBJECT (element));
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_element_send_event_default (GstElement *element, GstEvent *event)
|
|
{
|
|
GList *pads = element->pads;
|
|
gboolean res = FALSE;
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD_CAST (pads->data);
|
|
|
|
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
|
|
if (GST_PAD_IS_CONNECTED (pad)) {
|
|
res = gst_pad_send_event (GST_PAD_PEER (pad), event);
|
|
break;
|
|
}
|
|
}
|
|
pads = g_list_next (pads);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
gboolean
|
|
gst_element_send_event (GstElement *element, GstEvent *event)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
if (CLASS (element)->send_event)
|
|
return CLASS (element)->send_event (element, event);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_error:
|
|
* @element: Element with the error
|
|
* @error: A printf-like string describing the error
|
|
* @...: optional arguments for the string
|
|
*
|
|
* This function is used internally by elements to signal an error
|
|
* condition. It results in the "error" signal.
|
|
*/
|
|
void
|
|
gst_element_error (GstElement *element, const gchar *error, ...)
|
|
{
|
|
va_list var_args;
|
|
gchar *string;
|
|
|
|
/* checks */
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (error != NULL);
|
|
|
|
/* create error message */
|
|
va_start (var_args, error);
|
|
string = g_strdup_vprintf (error, var_args);
|
|
va_end (var_args);
|
|
GST_INFO (GST_CAT_EVENT, "ERROR in %s: %s", GST_ELEMENT_NAME (element), string);
|
|
|
|
/* emit the signal, make sure the element stays available */
|
|
gst_object_ref (GST_OBJECT (element));
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[ERROR], 0, element, string);
|
|
|
|
/* tell the scheduler */
|
|
if (element->sched) {
|
|
gst_scheduler_error (element->sched, element);
|
|
}
|
|
|
|
/* cleanup */
|
|
gst_object_unref (GST_OBJECT (element));
|
|
g_free (string);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_state:
|
|
* @element: a #GstElement to get state of
|
|
*
|
|
* Gets the state of the element.
|
|
*
|
|
* Returns: The #GstElementState of the element
|
|
*/
|
|
GstElementState
|
|
gst_element_get_state (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_VOID_PENDING);
|
|
|
|
return GST_STATE (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_wait_state_change:
|
|
* @element: a #GstElement to wait for
|
|
*
|
|
* Waits and blocks until the element changed its state.
|
|
*/
|
|
void
|
|
gst_element_wait_state_change (GstElement *element)
|
|
{
|
|
g_mutex_lock (element->state_mutex);
|
|
g_cond_wait (element->state_cond, element->state_mutex);
|
|
g_mutex_unlock (element->state_mutex);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_state:
|
|
* @element: a #GstElement to change state of
|
|
* @state: the element's new #GstElementState
|
|
*
|
|
* Sets the state of the element. This function will try to set the
|
|
* requested state by going through all the intermediary states and calling
|
|
* the class's state change function for each.
|
|
*
|
|
* Returns: whether or not the state was successfully set
|
|
* (using #GstElementStateReturn).
|
|
*/
|
|
gint
|
|
gst_element_set_state (GstElement *element, GstElementState state)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstElementState curpending;
|
|
GstElementStateReturn return_val = GST_STATE_SUCCESS;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
|
|
|
|
/* start with the current state */
|
|
curpending = GST_STATE(element);
|
|
|
|
GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "setting state from %s to %s",
|
|
gst_element_state_get_name (curpending),
|
|
gst_element_state_get_name (state));
|
|
|
|
/* loop until the final requested state is set */
|
|
while (GST_STATE (element) != state
|
|
&& GST_STATE (element) != GST_STATE_VOID_PENDING) {
|
|
/* move the curpending state in the correct direction */
|
|
if (curpending < state)
|
|
curpending <<= 1;
|
|
else
|
|
curpending >>= 1;
|
|
|
|
/* set the pending state variable */
|
|
/* FIXME: should probably check to see that we don't already have one */
|
|
GST_STATE_PENDING (element) = curpending;
|
|
|
|
if (curpending != state) {
|
|
GST_DEBUG_ELEMENT (GST_CAT_STATES, element,
|
|
"intermediate: setting state from %s to %s",
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
gst_element_state_get_name (curpending));
|
|
}
|
|
|
|
/* call the state change function so it can set the state */
|
|
oclass = CLASS (element);
|
|
if (oclass->change_state)
|
|
return_val = (oclass->change_state) (element);
|
|
|
|
switch (return_val) {
|
|
case GST_STATE_FAILURE:
|
|
GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "have failed change_state return");
|
|
goto exit;
|
|
case GST_STATE_ASYNC:
|
|
GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "element will change state async");
|
|
goto exit;
|
|
case GST_STATE_SUCCESS:
|
|
/* Last thing we do is verify that a successful state change really
|
|
* did change the state... */
|
|
if (GST_STATE (element) != curpending) {
|
|
GST_DEBUG_ELEMENT (GST_CAT_STATES, element,
|
|
"element claimed state-change success, but state didn't change %s, %s <-> %s",
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
gst_element_state_get_name (GST_STATE_PENDING (element)),
|
|
gst_element_state_get_name (curpending));
|
|
return GST_STATE_FAILURE;
|
|
}
|
|
break;
|
|
default:
|
|
/* somebody added a GST_STATE_ and forgot to do stuff here ! */
|
|
g_assert_not_reached ();
|
|
}
|
|
}
|
|
exit:
|
|
|
|
return return_val;
|
|
}
|
|
|
|
static gboolean
|
|
gst_element_negotiate_pads (GstElement *element)
|
|
{
|
|
GList *pads = GST_ELEMENT_PADS (element);
|
|
|
|
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "negotiating pads");
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
GstRealPad *srcpad;
|
|
|
|
pads = g_list_next (pads);
|
|
|
|
if (!GST_IS_REAL_PAD (pad))
|
|
continue;
|
|
|
|
srcpad = GST_PAD_REALIZE (pad);
|
|
|
|
/* if we have a connection on this pad and it doesn't have caps
|
|
* allready, try to negotiate */
|
|
if (GST_PAD_IS_CONNECTED (srcpad) && !GST_PAD_CAPS (srcpad)) {
|
|
GstRealPad *sinkpad;
|
|
GstElementState otherstate;
|
|
GstElement *parent;
|
|
|
|
sinkpad = GST_RPAD_PEER (GST_PAD_REALIZE (srcpad));
|
|
|
|
/* check the parent of the peer pad, if there is no parent do nothing */
|
|
parent = GST_PAD_PARENT (sinkpad);
|
|
if (!parent)
|
|
continue;
|
|
|
|
otherstate = GST_STATE (parent);
|
|
|
|
/* swap pads if needed */
|
|
if (!GST_PAD_IS_SRC (srcpad)) {
|
|
GstRealPad *temp;
|
|
|
|
temp = srcpad;
|
|
srcpad = sinkpad;
|
|
sinkpad = temp;
|
|
}
|
|
|
|
/* only try to negotiate if the peer element is in PAUSED or higher too */
|
|
if (otherstate >= GST_STATE_READY) {
|
|
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "perform negotiate for %s:%s and %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
if (!gst_pad_perform_negotiate (GST_PAD (srcpad), GST_PAD (sinkpad)))
|
|
return FALSE;
|
|
}
|
|
else {
|
|
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "not negotiatiating %s:%s and %s:%s, not in READY yet",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_element_clear_pad_caps (GstElement *element)
|
|
{
|
|
GList *pads = GST_ELEMENT_PADS (element);
|
|
|
|
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "clearing pad caps");
|
|
|
|
while (pads) {
|
|
GstRealPad *pad = GST_PAD_REALIZE (pads->data);
|
|
|
|
if (GST_PAD_CAPS (pad)) {
|
|
GST_PAD_CAPS (pad) = NULL;
|
|
}
|
|
pads = g_list_next (pads);
|
|
}
|
|
}
|
|
|
|
static GstElementStateReturn
|
|
gst_element_change_state (GstElement *element)
|
|
{
|
|
GstElementState old_state;
|
|
GstObject *parent;
|
|
gint old_pending, old_transition;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
|
|
|
|
old_state = GST_STATE (element);
|
|
old_pending = GST_STATE_PENDING (element);
|
|
old_transition = GST_STATE_TRANSITION (element);
|
|
|
|
if (old_pending == GST_STATE_VOID_PENDING || old_state == GST_STATE_PENDING (element)) {
|
|
GST_INFO (GST_CAT_STATES, "no state change needed for element %s (VOID_PENDING)", GST_ELEMENT_NAME (element));
|
|
return GST_STATE_SUCCESS;
|
|
}
|
|
|
|
GST_INFO (GST_CAT_STATES, "%s default handler sets state from %s to %s %d", GST_ELEMENT_NAME (element),
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (old_pending),
|
|
GST_STATE_TRANSITION (element));
|
|
|
|
/* we set the state change early for the negotiation functions */
|
|
GST_STATE (element) = old_pending;
|
|
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
|
|
|
|
/* if we are going to paused, we try to negotiate the pads */
|
|
if (old_transition == GST_STATE_NULL_TO_READY) {
|
|
if (!gst_element_negotiate_pads (element))
|
|
goto failure;
|
|
}
|
|
/* going to the READY state clears all pad caps */
|
|
else if (old_transition == GST_STATE_READY_TO_NULL) {
|
|
gst_element_clear_pad_caps (element);
|
|
}
|
|
|
|
/* tell the scheduler if we have one */
|
|
if (element->sched) {
|
|
if (gst_scheduler_state_transition (element->sched, element, old_transition)
|
|
!= GST_STATE_SUCCESS) {
|
|
goto failure;
|
|
}
|
|
}
|
|
|
|
parent = GST_ELEMENT_PARENT (element);
|
|
|
|
/* tell our parent about the state change */
|
|
if (parent && GST_IS_BIN (parent)) {
|
|
gst_bin_child_state_change (GST_BIN (parent), old_state, GST_STATE (element), element);
|
|
}
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[STATE_CHANGE],
|
|
0, old_state, GST_STATE (element));
|
|
|
|
/* signal the state change in case somebody is waiting for us */
|
|
g_mutex_lock (element->state_mutex);
|
|
g_cond_signal (element->state_cond);
|
|
g_mutex_unlock (element->state_mutex);
|
|
|
|
return GST_STATE_SUCCESS;
|
|
|
|
failure:
|
|
/* undo the state change */
|
|
GST_STATE (element) = old_state;
|
|
GST_STATE_PENDING (element) = old_pending;
|
|
|
|
return GST_STATE_FAILURE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_factory:
|
|
* @element: element to request the factory
|
|
*
|
|
* Retrieves the factory that was used to create this element
|
|
*
|
|
* Returns: the factory used for creating this element
|
|
*/
|
|
GstElementFactory*
|
|
gst_element_get_factory (GstElement *element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = CLASS (element);
|
|
|
|
return oclass->elementfactory;
|
|
}
|
|
|
|
static void
|
|
gst_element_dispose (GObject *object)
|
|
{
|
|
GstElement *element = GST_ELEMENT (object);
|
|
GList *pads;
|
|
GstPad *pad;
|
|
|
|
GST_DEBUG_ELEMENT (GST_CAT_REFCOUNTING, element, "dispose");
|
|
|
|
gst_element_set_state (element, GST_STATE_NULL);
|
|
|
|
/* first we break all our connections with the ouside */
|
|
if (element->pads) {
|
|
GList *orig;
|
|
orig = pads = g_list_copy (element->pads);
|
|
while (pads) {
|
|
pad = GST_PAD (pads->data);
|
|
|
|
if (GST_PAD_PEER (pad)) {
|
|
GST_DEBUG (GST_CAT_REFCOUNTING, "disconnecting pad '%s'",
|
|
GST_OBJECT_NAME (GST_OBJECT (GST_PAD (GST_PAD_PEER (pad)))));
|
|
gst_pad_disconnect (pad, GST_PAD (GST_PAD_PEER (pad)));
|
|
}
|
|
gst_element_remove_pad (element, pad);
|
|
|
|
pads = g_list_next (pads);
|
|
}
|
|
g_list_free (orig);
|
|
g_list_free (element->pads);
|
|
element->pads = NULL;
|
|
}
|
|
|
|
element->numsrcpads = 0;
|
|
element->numsinkpads = 0;
|
|
element->numpads = 0;
|
|
g_mutex_free (element->state_mutex);
|
|
g_cond_free (element->state_cond);
|
|
|
|
if (element->prop_value_queue)
|
|
g_async_queue_unref (element->prop_value_queue);
|
|
element->prop_value_queue = NULL;
|
|
if (element->property_mutex)
|
|
g_mutex_free (element->property_mutex);
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
}
|
|
|
|
#ifndef GST_DISABLE_LOADSAVE
|
|
/**
|
|
* gst_element_save_thyself:
|
|
* @element: GstElement to save
|
|
* @parent: the xml parent node
|
|
*
|
|
* Saves the element as part of the given XML structure
|
|
*
|
|
* Returns: the new xml node
|
|
*/
|
|
static xmlNodePtr
|
|
gst_element_save_thyself (GstObject *object,
|
|
xmlNodePtr parent)
|
|
{
|
|
GList *pads;
|
|
GstElementClass *oclass;
|
|
GParamSpec **specs, *spec;
|
|
gint nspecs, i;
|
|
GValue value = { 0, };
|
|
GstElement *element;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (object), parent);
|
|
|
|
element = GST_ELEMENT (object);
|
|
|
|
oclass = CLASS (element);
|
|
|
|
xmlNewChild(parent, NULL, "name", GST_ELEMENT_NAME(element));
|
|
|
|
if (oclass->elementfactory != NULL) {
|
|
GstElementFactory *factory = (GstElementFactory *)oclass->elementfactory;
|
|
|
|
xmlNewChild (parent, NULL, "type", GST_OBJECT_NAME (factory));
|
|
xmlNewChild (parent, NULL, "version", factory->details->version);
|
|
}
|
|
|
|
/* FIXME: what is this? */
|
|
/* if (element->manager) */
|
|
/* xmlNewChild(parent, NULL, "manager", GST_ELEMENT_NAME(element->manager)); */
|
|
|
|
/* params */
|
|
specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (object), &nspecs);
|
|
|
|
for (i=0; i<nspecs; i++) {
|
|
spec = specs[i];
|
|
if (spec->flags & G_PARAM_READABLE) {
|
|
xmlNodePtr param;
|
|
|
|
g_value_init(&value, G_PARAM_SPEC_VALUE_TYPE (spec));
|
|
|
|
g_object_get_property (G_OBJECT (element), spec->name, &value);
|
|
param = xmlNewChild (parent, NULL, "param", NULL);
|
|
xmlNewChild (param, NULL, "name", spec->name);
|
|
|
|
if (G_IS_PARAM_SPEC_STRING (spec))
|
|
xmlNewChild (param, NULL, "value", g_value_dup_string (&value));
|
|
else if (G_IS_PARAM_SPEC_ENUM (spec))
|
|
xmlNewChild (param, NULL, "value", g_strdup_printf ("%d", g_value_get_enum (&value)));
|
|
else if (G_IS_PARAM_SPEC_INT64 (spec))
|
|
xmlNewChild (param, NULL, "value", g_strdup_printf ("%lld", g_value_get_int64 (&value)));
|
|
else
|
|
xmlNewChild (param, NULL, "value", g_strdup_value_contents (&value));
|
|
|
|
g_value_unset(&value);
|
|
}
|
|
}
|
|
|
|
pads = GST_ELEMENT_PADS (element);
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
/* figure out if it's a direct pad or a ghostpad */
|
|
if (GST_ELEMENT (GST_OBJECT_PARENT (pad)) == element) {
|
|
xmlNodePtr padtag = xmlNewChild (parent, NULL, "pad", NULL);
|
|
gst_object_save_thyself (GST_OBJECT (pad), padtag);
|
|
}
|
|
pads = g_list_next (pads);
|
|
}
|
|
|
|
return parent;
|
|
}
|
|
|
|
static void
|
|
gst_element_restore_thyself (GstObject *object, xmlNodePtr self)
|
|
{
|
|
xmlNodePtr children;
|
|
GstElement *element;
|
|
guchar *name = NULL;
|
|
guchar *value = NULL;
|
|
|
|
element = GST_ELEMENT (object);
|
|
g_return_if_fail (element != NULL);
|
|
|
|
/* parameters */
|
|
children = self->xmlChildrenNode;
|
|
while (children) {
|
|
if (!strcmp (children->name, "param")) {
|
|
xmlNodePtr child = children->xmlChildrenNode;
|
|
|
|
while (child) {
|
|
if (!strcmp (child->name, "name")) {
|
|
name = xmlNodeGetContent (child);
|
|
}
|
|
else if (!strcmp (child->name, "value")) {
|
|
value = xmlNodeGetContent (child);
|
|
}
|
|
child = child->next;
|
|
}
|
|
/* FIXME: can this just be g_object_set ? */
|
|
gst_util_set_object_arg ((GObject *)G_OBJECT (element), name, value);
|
|
}
|
|
children = children->next;
|
|
}
|
|
|
|
/* pads */
|
|
children = self->xmlChildrenNode;
|
|
while (children) {
|
|
if (!strcmp (children->name, "pad")) {
|
|
gst_pad_load_and_connect (children, GST_OBJECT (element));
|
|
}
|
|
children = children->next;
|
|
}
|
|
|
|
if (GST_OBJECT_CLASS(parent_class)->restore_thyself)
|
|
(GST_OBJECT_CLASS(parent_class)->restore_thyself) (object, self);
|
|
}
|
|
#endif /* GST_DISABLE_LOADSAVE */
|
|
|
|
/**
|
|
* gst_element_yield:
|
|
* @element: Element to yield
|
|
*
|
|
* Request a yield operation for the child. The scheduler will typically
|
|
* give control to another element.
|
|
*/
|
|
void
|
|
gst_element_yield (GstElement *element)
|
|
{
|
|
if (GST_ELEMENT_SCHED (element)) {
|
|
gst_scheduler_yield (GST_ELEMENT_SCHED (element), element);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_interrupt:
|
|
* @element: Element to interrupt
|
|
*
|
|
* Request the scheduler of this element to interrupt the execution of
|
|
* this element and scheduler another one.
|
|
*
|
|
* Returns: a boolean indicating that the child should exit its chain/loop/get
|
|
* function ASAP, depending on the scheduler implementation.
|
|
*/
|
|
gboolean
|
|
gst_element_interrupt (GstElement *element)
|
|
{
|
|
if (GST_ELEMENT_SCHED (element)) {
|
|
return gst_scheduler_interrupt (GST_ELEMENT_SCHED (element), element);
|
|
}
|
|
else
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_scheduler:
|
|
* @element: Element to set manager of.
|
|
* @sched: @GstScheduler to set.
|
|
*
|
|
* Sets the scheduler of the element. For internal use only, unless you're
|
|
* writing a new bin subclass.
|
|
*/
|
|
void
|
|
gst_element_set_scheduler (GstElement *element,
|
|
GstScheduler *sched)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, element, "setting scheduler to %p", sched);
|
|
|
|
element->sched = sched;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_scheduler:
|
|
* @element: Element to get manager of.
|
|
*
|
|
* Returns the scheduler of the element.
|
|
*
|
|
* Returns: Element's scheduler
|
|
*/
|
|
GstScheduler*
|
|
gst_element_get_scheduler (GstElement *element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return element->sched;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_loop_function:
|
|
* @element: Element to set loop function of.
|
|
* @loop: Pointer to loop function.
|
|
*
|
|
* This sets the loop function for the element. The function pointed to
|
|
* can deviate from the GstElementLoopFunction definition in type of
|
|
* pointer only.
|
|
*
|
|
* NOTE: in order for this to take effect, the current loop function *must*
|
|
* exit. Assuming the loop function itself is the only one who will cause
|
|
* a new loopfunc to be assigned, this should be no problem.
|
|
*/
|
|
void
|
|
gst_element_set_loop_function (GstElement *element,
|
|
GstElementLoopFunction loop)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
/* set the loop function */
|
|
element->loopfunc = loop;
|
|
|
|
/* set the NEW_LOOPFUNC flag so everyone knows to go try again */
|
|
GST_FLAG_SET (element, GST_ELEMENT_NEW_LOOPFUNC);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_eos:
|
|
* @element: element to set to the EOS state
|
|
*
|
|
* Perform the actions needed to bring the element in the EOS state.
|
|
*/
|
|
void
|
|
gst_element_set_eos (GstElement *element)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_DEBUG (GST_CAT_EVENT, "setting EOS on element %s", GST_OBJECT_NAME (element));
|
|
|
|
gst_element_set_state (element, GST_STATE_PAUSED);
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[EOS], 0);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_state_get_name:
|
|
* @state: a #GstElementState to get the name of
|
|
*
|
|
* Gets a string representing the given state.
|
|
*
|
|
* Returns: a string with the statename.
|
|
*/
|
|
const gchar*
|
|
gst_element_state_get_name (GstElementState state)
|
|
{
|
|
switch (state) {
|
|
#ifdef GST_DEBUG_COLOR
|
|
case GST_STATE_VOID_PENDING: return "NONE_PENDING";break;
|
|
case GST_STATE_NULL: return "\033[01;37mNULL\033[00m";break;
|
|
case GST_STATE_READY: return "\033[01;31mREADY\033[00m";break;
|
|
case GST_STATE_PLAYING: return "\033[01;32mPLAYING\033[00m";break;
|
|
case GST_STATE_PAUSED: return "\033[01;33mPAUSED\033[00m";break;
|
|
default: return g_strdup_printf ("\033[01;37;41mUNKNOWN!\033[00m(%d)", state);
|
|
#else
|
|
case GST_STATE_VOID_PENDING: return "NONE_PENDING";break;
|
|
case GST_STATE_NULL: return "NULL";break;
|
|
case GST_STATE_READY: return "READY";break;
|
|
case GST_STATE_PLAYING: return "PLAYING";break;
|
|
case GST_STATE_PAUSED: return "PAUSED";break;
|
|
default: return "UNKNOWN!";
|
|
#endif
|
|
}
|
|
return "";
|
|
}
|
|
|
|
static void
|
|
gst_element_populate_std_props (GObjectClass * klass,
|
|
const gchar *prop_name, guint arg_id, GParamFlags flags)
|
|
{
|
|
GQuark prop_id = g_quark_from_string (prop_name);
|
|
GParamSpec *pspec;
|
|
|
|
static GQuark fd_id = 0;
|
|
static GQuark blocksize_id;
|
|
static GQuark bytesperread_id;
|
|
static GQuark dump_id;
|
|
static GQuark filesize_id;
|
|
static GQuark mmapsize_id;
|
|
static GQuark location_id;
|
|
static GQuark offset_id;
|
|
static GQuark silent_id;
|
|
static GQuark touch_id;
|
|
|
|
if (!fd_id) {
|
|
fd_id = g_quark_from_static_string ("fd");
|
|
blocksize_id = g_quark_from_static_string ("blocksize");
|
|
bytesperread_id = g_quark_from_static_string ("bytesperread");
|
|
dump_id = g_quark_from_static_string ("dump");
|
|
filesize_id = g_quark_from_static_string ("filesize");
|
|
mmapsize_id = g_quark_from_static_string ("mmapsize");
|
|
location_id = g_quark_from_static_string ("location");
|
|
offset_id = g_quark_from_static_string ("offset");
|
|
silent_id = g_quark_from_static_string ("silent");
|
|
touch_id = g_quark_from_static_string ("touch");
|
|
}
|
|
|
|
if (prop_id == fd_id) {
|
|
pspec = g_param_spec_int ("fd", "File-descriptor",
|
|
"File-descriptor for the file being read",
|
|
0, G_MAXINT, 0, flags);
|
|
}
|
|
else if (prop_id == blocksize_id) {
|
|
pspec = g_param_spec_ulong ("blocksize", "Block Size",
|
|
"Block size to read per buffer",
|
|
0, G_MAXULONG, 4096, flags);
|
|
|
|
}
|
|
else if (prop_id == bytesperread_id) {
|
|
pspec = g_param_spec_int ("bytesperread", "Bytes per read",
|
|
"Number of bytes to read per buffer",
|
|
G_MININT, G_MAXINT, 0, flags);
|
|
|
|
}
|
|
else if (prop_id == dump_id) {
|
|
pspec = g_param_spec_boolean ("dump", "Dump", "Dump bytes to stdout", FALSE, flags);
|
|
|
|
}
|
|
else if (prop_id == filesize_id) {
|
|
pspec = g_param_spec_int64 ("filesize", "File Size",
|
|
"Size of the file being read",
|
|
0, G_MAXINT64, 0, flags);
|
|
|
|
}
|
|
else if (prop_id == mmapsize_id) {
|
|
pspec = g_param_spec_ulong ("mmapsize", "mmap() Block Size",
|
|
"Size in bytes of mmap()d regions",
|
|
0, G_MAXULONG, 4 * 1048576, flags);
|
|
|
|
}
|
|
else if (prop_id == location_id) {
|
|
pspec = g_param_spec_string ("location", "File Location",
|
|
"Location of the file to read",
|
|
NULL, flags);
|
|
|
|
}
|
|
else if (prop_id == offset_id) {
|
|
pspec = g_param_spec_int64 ("offset", "File Offset",
|
|
"Byte offset of current read pointer",
|
|
0, G_MAXINT64, 0, flags);
|
|
|
|
}
|
|
else if (prop_id == silent_id) {
|
|
pspec = g_param_spec_boolean ("silent", "Silent", "Don't produce events",
|
|
FALSE, flags);
|
|
|
|
}
|
|
else if (prop_id == touch_id) {
|
|
pspec = g_param_spec_boolean ("touch", "Touch read data",
|
|
"Touch data to force disk read before "
|
|
"push ()", TRUE, flags);
|
|
}
|
|
else {
|
|
g_warning ("Unknown - 'standard' property '%s' id %d from klass %s",
|
|
prop_name, arg_id, g_type_name (G_OBJECT_CLASS_TYPE (klass)));
|
|
pspec = NULL;
|
|
}
|
|
|
|
if (pspec) {
|
|
g_object_class_install_property (klass, arg_id, pspec);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_install_std_props:
|
|
* @klass: the class to add the properties to
|
|
* @first_name: the first in a NULL terminated
|
|
* 'name', 'id', 'flags' triplet list.
|
|
* @...: the triplet list
|
|
*
|
|
* Add a list of standardized properties with types to the @klass.
|
|
* the id is for the property switch in your get_prop method, and
|
|
* the flags determine readability / writeability.
|
|
**/
|
|
void
|
|
gst_element_class_install_std_props (GstElementClass * klass, const gchar *first_name, ...)
|
|
{
|
|
const char *name;
|
|
|
|
va_list args;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
|
|
va_start (args, first_name);
|
|
|
|
name = first_name;
|
|
|
|
while (name) {
|
|
int arg_id = va_arg (args, int);
|
|
int flags = va_arg (args, int);
|
|
|
|
gst_element_populate_std_props ((GObjectClass *) klass, name, arg_id, flags);
|
|
|
|
name = va_arg (args, char *);
|
|
}
|
|
|
|
va_end (args);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_managing_bin:
|
|
* @element: a #GstElement
|
|
*
|
|
* Gets the managing bin (a pipeline or a thread, for example) of an element.
|
|
*
|
|
* Returns: the #GstBin, or NULL on failure
|
|
**/
|
|
GstBin*
|
|
gst_element_get_managing_bin (GstElement *element)
|
|
{
|
|
GstBin *bin;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
|
|
bin = GST_BIN (gst_object_get_parent (GST_OBJECT_CAST (element)));
|
|
|
|
while (bin && !GST_FLAG_IS_SET (GST_OBJECT_CAST (bin), GST_BIN_FLAG_MANAGER))
|
|
bin = GST_BIN (gst_object_get_parent (GST_OBJECT_CAST (bin)));
|
|
|
|
return bin;
|
|
}
|