--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstbin.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,3497 @@
+/* GStreamer
+ *
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2004 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * gstbin.c: GstBin container object and support code
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * MT safe.
+ */
+
+/**
+ * SECTION:gstbin
+ * @short_description: Base class and element that can contain other elements
+ *
+ * #GstBin is an element that can contain other #GstElement, allowing them to be
+ * managed as a group.
+ * Pads from the child elements can be ghosted to the bin, see #GstGhostPad.
+ * This makes the bin look like any other elements and enables creation of
+ * higher-level abstraction elements.
+ *
+ * A new #GstBin is created with gst_bin_new(). Use a #GstPipeline instead if you
+ * want to create a toplevel bin because a normal bin doesn't have a bus or
+ * handle clock distribution of its own.
+ *
+ * After the bin has been created you will typically add elements to it with
+ * gst_bin_add(). You can remove elements with gst_bin_remove().
+ *
+ * An element can be retrieved from a bin with gst_bin_get_by_name(), using the
+ * elements name. gst_bin_get_by_name_recurse_up() is mainly used for internal
+ * purposes and will query the parent bins when the element is not found in the
+ * current bin.
+ *
+ * An iterator of elements in a bin can be retrieved with
+ * gst_bin_iterate_elements(). Various other iterators exist to retrieve the
+ * elements in a bin.
+ *
+ * gst_object_unref() is used to drop your reference to the bin.
+ *
+ * The <link linkend="GstBin-element-added">element-added</link> signal is
+ * fired whenever a new element is added to the bin. Likewise the <link
+ * linkend="GstBin-element-removed">element-removed</link> signal is fired
+ * whenever an element is removed from the bin.
+ *
+ * <refsect2><title>Notes</title>
+ * <para>
+ * A #GstBin internally intercepts every #GstMessage posted by its children and
+ * implements the following default behaviour for each of them:
+ * <variablelist>
+ * <varlistentry>
+ * <term>GST_MESSAGE_EOS</term>
+ * <listitem><para>This message is only posted by sinks in the PLAYING
+ * state. If all sinks posted the EOS message, this bin will post and EOS
+ * message upwards.</para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>GST_MESSAGE_SEGMENT_START</term>
+ * <listitem><para>just collected and never forwarded upwards.
+ * The messages are used to decide when all elements have completed playback
+ * of their segment.</para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>GST_MESSAGE_SEGMENT_DONE</term>
+ * <listitem><para> Is posted by #GstBin when all elements that posted
+ * a SEGMENT_START have posted a SEGMENT_DONE.</para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>GST_MESSAGE_DURATION</term>
+ * <listitem><para> Is posted by an element that detected a change
+ * in the stream duration. The default bin behaviour is to clear any
+ * cached duration values so that the next duration query will perform
+ * a full duration recalculation. The duration change is posted to the
+ * application so that it can refetch the new duration with a duration
+ * query.
+ * </para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>GST_MESSAGE_CLOCK_LOST</term>
+ * <listitem><para> This message is posted by an element when it
+ * can no longer provide a clock. The default bin behaviour is to
+ * check if the lost clock was the one provided by the bin. If so and
+ * the bin is currently in the PLAYING state, the message is forwarded to
+ * the bin parent.
+ * This message is also generated when a clock provider is removed from
+ * the bin. If this message is received by the application, it should
+ * PAUSE the pipeline and set it back to PLAYING to force a new clock
+ * distribution.
+ * </para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>GST_MESSAGE_CLOCK_PROVIDE</term>
+ * <listitem><para> This message is generated when an element
+ * can provide a clock. This mostly happens when a new clock
+ * provider is added to the bin. The default behaviour of the bin is to
+ * mark the currently selected clock as dirty, which will perform a clock
+ * recalculation the next time the bin is asked to provide a clock.
+ * This message is never sent tot the application but is forwarded to
+ * the parent of the bin.
+ * </para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>OTHERS</term>
+ * <listitem><para> posted upwards.</para></listitem>
+ * </varlistentry>
+ * </variablelist>
+ *
+ *
+ * A #GstBin implements the following default behaviour for answering to a
+ * #GstQuery:
+ * <variablelist>
+ * <varlistentry>
+ * <term>GST_QUERY_DURATION</term>
+ * <listitem><para>If the query has been asked before with the same format
+ * and the bin is a toplevel bin (ie. has no parent),
+ * use the cached previous value. If no previous value was cached, the
+ * query is sent to all sink elements in the bin and the MAXIMUM of all
+ * values is returned. If the bin is a toplevel bin the value is cached.
+ * If no sinks are available in the bin, the query fails.
+ * </para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>GST_QUERY_POSITION</term>
+ * <listitem><para>The query is sent to all sink elements in the bin and the
+ * MAXIMUM of all values is returned. If no sinks are available in the bin,
+ * the query fails.
+ * </para></listitem>
+ * </varlistentry>
+ * <varlistentry>
+ * <term>OTHERS</term>
+ * <listitem><para>the query is forwarded to all sink elements, the result
+ * of the first sink that answers the query successfully is returned. If no
+ * sink is in the bin, the query fails.</para></listitem>
+ * </varlistentry>
+ * </variablelist>
+ *
+ * A #GstBin will by default forward any event sent to it to all sink elements.
+ * If all the sinks return TRUE, the bin will also return TRUE, else FALSE is
+ * returned. If no sinks are in the bin, the event handler will return TRUE.
+ *
+ * </para>
+ * </refsect2>
+ *
+ * Last reviewed on 2006-04-28 (0.10.6)
+ */
+
+#include "gst_private.h"
+
+#include "gstevent.h"
+#include "gstbin.h"
+#include "gstmarshal.h"
+#include "gstxml.h"
+#include "gstinfo.h"
+#include "gsterror.h"
+
+#include "gstindex.h"
+#include "gstindexfactory.h"
+#include "gstutils.h"
+#include "gstchildproxy.h"
+
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#endif
+
+/* enable for DURATION caching.
+ * FIXME currently too many elements don't update
+ * their duration when it changes so we return inaccurate values. */
+#undef DURATION_CACHING
+
+/* latency is by default enabled now.
+ * live-preroll and no-live-preroll in the environment var GST_COMPAT
+ * to enables or disable it respectively.
+ */
+static gboolean enable_latency = TRUE;
+
+GST_DEBUG_CATEGORY_STATIC (bin_debug);
+#define GST_CAT_DEFAULT bin_debug
+
+/* a bin is toplevel if it has no parent or when it is configured to behave like
+ * a toplevel bin */
+#define BIN_IS_TOPLEVEL(bin) ((GST_OBJECT_PARENT (bin) == NULL) || bin->priv->asynchandling)
+
+struct _GstBinPrivate
+{
+ gboolean asynchandling;
+};
+
+typedef struct
+{
+ GstBin *bin;
+ guint32 cookie;
+ GstState pending;
+} BinContinueData;
+
+static void gst_bin_dispose (GObject * object);
+
+static void gst_bin_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_bin_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+
+static GstStateChangeReturn gst_bin_change_state_func (GstElement * element,
+ GstStateChange transition);
+static GstStateChangeReturn gst_bin_get_state_func (GstElement * element,
+ GstState * state, GstState * pending, GstClockTime timeout);
+static void bin_handle_async_done (GstBin * bin, GstStateChangeReturn ret);
+static void bin_handle_async_start (GstBin * bin, gboolean new_base_time);
+static void bin_push_state_continue (BinContinueData * data);
+
+static gboolean gst_bin_add_func (GstBin * bin, GstElement * element);
+static gboolean gst_bin_remove_func (GstBin * bin, GstElement * element);
+
+#ifndef GST_DISABLE_INDEX
+static void gst_bin_set_index_func (GstElement * element, GstIndex * index);
+#endif
+static GstClock *gst_bin_provide_clock_func (GstElement * element);
+static gboolean gst_bin_set_clock_func (GstElement * element, GstClock * clock);
+
+static void gst_bin_handle_message_func (GstBin * bin, GstMessage * message);
+static gboolean gst_bin_send_event (GstElement * element, GstEvent * event);
+static GstBusSyncReply bin_bus_handler (GstBus * bus,
+ GstMessage * message, GstBin * bin);
+static gboolean gst_bin_query (GstElement * element, GstQuery * query);
+
+#ifndef GST_DISABLE_LOADSAVE
+static xmlNodePtr gst_bin_save_thyself (GstObject * object, xmlNodePtr parent);
+static void gst_bin_restore_thyself (GstObject * object, xmlNodePtr self);
+#endif
+
+static void bin_remove_messages (GstBin * bin, GstObject * src,
+ GstMessageType types);
+static void gst_bin_continue_func (BinContinueData * data);
+static gint bin_element_is_sink (GstElement * child, GstBin * bin);
+static gint bin_element_is_src (GstElement * child, GstBin * bin);
+
+static GstIterator *gst_bin_sort_iterator_new (GstBin * bin);
+
+/* Bin signals and properties */
+enum
+{
+ ELEMENT_ADDED,
+ ELEMENT_REMOVED,
+ LAST_SIGNAL
+};
+
+#define DEFAULT_ASYNC_HANDLING FALSE
+
+enum
+{
+ PROP_0,
+ PROP_ASYNC_HANDLING
+ /* FILL ME */
+};
+
+static void gst_bin_base_init (gpointer g_class);
+static void gst_bin_class_init (GstBinClass * klass);
+static void gst_bin_init (GstBin * bin);
+static void gst_bin_child_proxy_init (gpointer g_iface, gpointer iface_data);
+
+static GstElementClass *parent_class = NULL;
+static guint gst_bin_signals[LAST_SIGNAL] = { 0 };
+
+/**
+ * gst_bin_get_type:
+ *
+ * Returns: the type of #GstBin
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GType
+gst_bin_get_type (void)
+{
+ static GType gst_bin_type = 0;
+ const gchar *compat;
+
+ if (G_UNLIKELY (gst_bin_type == 0)) {
+ static const GTypeInfo bin_info = {
+ sizeof (GstBinClass),
+ gst_bin_base_init,
+ NULL,
+ (GClassInitFunc) gst_bin_class_init,
+ NULL,
+ NULL,
+ sizeof (GstBin),
+ 0,
+ (GInstanceInitFunc) gst_bin_init,
+ NULL
+ };
+ static const GInterfaceInfo child_proxy_info = {
+ gst_bin_child_proxy_init,
+ NULL,
+ NULL
+ };
+
+ gst_bin_type =
+ g_type_register_static (GST_TYPE_ELEMENT, "GstBin", &bin_info, 0);
+
+ g_type_add_interface_static (gst_bin_type, GST_TYPE_CHILD_PROXY,
+ &child_proxy_info);
+
+ GST_DEBUG_CATEGORY_INIT (bin_debug, "bin", GST_DEBUG_BOLD,
+ "debugging info for the 'bin' container element");
+
+ /* compatibility stuff */
+ compat = g_getenv ("GST_COMPAT");
+ if (compat != NULL) {
+ if (strstr (compat, "no-live-preroll"))
+ enable_latency = FALSE;
+ else if (strstr (compat, "live-preroll"))
+ enable_latency = TRUE;
+ }
+ }
+ return gst_bin_type;
+}
+
+static void
+gst_bin_base_init (gpointer g_class)
+{
+ GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_set_details_simple (gstelement_class, "Generic bin",
+ "Generic/Bin",
+ "Simple container object",
+ "Erik Walthinsen <omega@cse.ogi.edu>,"
+ "Wim Taymans <wim.taymans@gmail.com>");
+}
+
+static GstObject *
+gst_bin_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
+ guint index)
+{
+ GstObject *res;
+ GstBin *bin;
+
+ bin = GST_BIN_CAST (child_proxy);
+
+ GST_OBJECT_LOCK (bin);
+ if ((res = g_list_nth_data (bin->children, index)))
+ gst_object_ref (res);
+ GST_OBJECT_UNLOCK (bin);
+
+ return res;
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+guint
+gst_bin_child_proxy_get_children_count (GstChildProxy * child_proxy)
+{
+ guint num;
+ GstBin *bin;
+
+ bin = GST_BIN_CAST (child_proxy);
+
+ GST_OBJECT_LOCK (bin);
+ num = bin->numchildren;
+ GST_OBJECT_UNLOCK (bin);
+
+ return num;
+}
+
+static void
+gst_bin_child_proxy_init (gpointer g_iface, gpointer iface_data)
+{
+ GstChildProxyInterface *iface = g_iface;
+
+ iface->get_children_count = gst_bin_child_proxy_get_children_count;
+ iface->get_child_by_index = gst_bin_child_proxy_get_child_by_index;
+}
+
+static void
+gst_bin_class_init (GstBinClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstObjectClass *gstobject_class;
+ GstElementClass *gstelement_class;
+ GError *err;
+
+ gobject_class = (GObjectClass *) klass;
+ gstobject_class = (GstObjectClass *) klass;
+ gstelement_class = (GstElementClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_bin_set_property);
+ gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_bin_get_property);
+
+ /**
+ * GstBin:async-handling
+ *
+ * If set to #TRUE, the bin will handle asynchronous state changes.
+ * This should be used only if the bin subclass is modifying the state
+ * of its children on its own.
+ *
+ * Since: 0.10.13
+ */
+ g_object_class_install_property (gobject_class, PROP_ASYNC_HANDLING,
+ g_param_spec_boolean ("async-handling", "Async Handling",
+ "The bin will handle Asynchronous state changes",
+ DEFAULT_ASYNC_HANDLING, G_PARAM_READWRITE));
+
+ /**
+ * GstBin::element-added:
+ * @bin: the #GstBin
+ * @element: the #GstElement that was added to the bin
+ *
+ * Will be emitted after the element was added to the bin.
+ */
+ gst_bin_signals[ELEMENT_ADDED] =
+ g_signal_new ("element-added", G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstBinClass, element_added), NULL,
+ NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_ELEMENT);
+ /**
+ * GstBin::element-removed:
+ * @bin: the #GstBin
+ * @element: the #GstElement that was removed from the bin
+ *
+ * Will be emitted after the element was removed from the bin.
+ */
+ gst_bin_signals[ELEMENT_REMOVED] =
+ g_signal_new ("element-removed", G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstBinClass, element_removed), NULL,
+ NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_ELEMENT);
+
+ gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_bin_dispose);
+
+#ifndef GST_DISABLE_LOADSAVE
+ gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_bin_save_thyself);
+ gstobject_class->restore_thyself =
+ GST_DEBUG_FUNCPTR (gst_bin_restore_thyself);
+#endif
+
+ gstelement_class->change_state =
+ GST_DEBUG_FUNCPTR (gst_bin_change_state_func);
+ gstelement_class->get_state = GST_DEBUG_FUNCPTR (gst_bin_get_state_func);
+#ifndef GST_DISABLE_INDEX
+ gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_bin_set_index_func);
+#endif
+ gstelement_class->provide_clock =
+ GST_DEBUG_FUNCPTR (gst_bin_provide_clock_func);
+ gstelement_class->set_clock = GST_DEBUG_FUNCPTR (gst_bin_set_clock_func);
+
+ gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_bin_send_event);
+ gstelement_class->query = GST_DEBUG_FUNCPTR (gst_bin_query);
+
+ klass->add_element = GST_DEBUG_FUNCPTR (gst_bin_add_func);
+ klass->remove_element = GST_DEBUG_FUNCPTR (gst_bin_remove_func);
+ klass->handle_message = GST_DEBUG_FUNCPTR (gst_bin_handle_message_func);
+
+ GST_DEBUG ("creating bin thread pool");
+ err = NULL;
+ klass->pool =
+ g_thread_pool_new ((GFunc) gst_bin_continue_func, NULL, -1, FALSE, &err);
+ if (err != NULL) {
+ g_critical ("could alloc threadpool %s", err->message);
+ }
+}
+
+static void
+gst_bin_init (GstBin * bin)
+{
+ GstBus *bus;
+
+ bin->numchildren = 0;
+ bin->children = NULL;
+ bin->children_cookie = 0;
+ bin->messages = NULL;
+ bin->provided_clock = NULL;
+ bin->clock_dirty = FALSE;
+
+ /* Set up a bus for listening to child elements */
+ bus = gst_bus_new ();
+ bin->child_bus = bus;
+ GST_DEBUG_OBJECT (bin, "using bus %" GST_PTR_FORMAT " to listen to children",
+ bus);
+ gst_bus_set_sync_handler (bus, (GstBusSyncHandler) bin_bus_handler, bin);
+
+ bin->priv = g_new0 (GstBinPrivate, 1);
+ bin->priv->asynchandling = DEFAULT_ASYNC_HANDLING;
+}
+
+static void
+gst_bin_dispose (GObject * object)
+{
+ GstBin *bin = GST_BIN (object);
+ GstBus **child_bus_p = &bin->child_bus;
+ GstClock **provided_clock_p = &bin->provided_clock;
+ GstElement **clock_provider_p = &bin->clock_provider;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, object, "dispose");
+
+ bin_remove_messages (bin, NULL, GST_MESSAGE_ANY);
+
+ gst_object_replace ((GstObject **) child_bus_p, NULL);
+ gst_object_replace ((GstObject **) provided_clock_p, NULL);
+ gst_object_replace ((GstObject **) clock_provider_p, NULL);
+
+ while (bin->children) {
+ gst_bin_remove (bin, GST_ELEMENT_CAST (bin->children->data));
+ }
+ if (G_UNLIKELY (bin->children != NULL)) {
+ g_critical ("could not remove elements from bin %s",
+ GST_STR_NULL (GST_OBJECT_NAME (object)));
+ }
+
+ if (bin->priv) {
+ g_free (bin->priv);
+ bin->priv = NULL;
+ }
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+/**
+ * gst_bin_new:
+ * @name: the name of the new bin
+ *
+ * Creates a new bin with the given name.
+ *
+ * Returns: a new #GstBin
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElement *
+gst_bin_new (const gchar * name)
+{
+ return gst_element_factory_make ("bin", name);
+}
+
+static void
+gst_bin_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstBin *gstbin;
+
+ gstbin = GST_BIN (object);
+
+ switch (prop_id) {
+ case PROP_ASYNC_HANDLING:
+ GST_OBJECT_LOCK (gstbin);
+ gstbin->priv->asynchandling = g_value_get_boolean (value);
+ GST_OBJECT_UNLOCK (gstbin);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_bin_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstBin *gstbin;
+
+ gstbin = GST_BIN (object);
+
+ switch (prop_id) {
+ case PROP_ASYNC_HANDLING:
+ GST_OBJECT_LOCK (gstbin);
+ g_value_set_boolean (value, gstbin->priv->asynchandling);
+ GST_OBJECT_UNLOCK (gstbin);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+/* set the index on all elements in this bin
+ *
+ * MT safe
+ */
+#ifndef GST_DISABLE_INDEX
+static void
+gst_bin_set_index_func (GstElement * element, GstIndex * index)
+{
+ GstBin *bin;
+ GList *children;
+
+ bin = GST_BIN (element);
+
+ GST_OBJECT_LOCK (bin);
+ for (children = bin->children; children; children = g_list_next (children)) {
+ GstElement *child = GST_ELEMENT (children->data);
+
+ gst_element_set_index (child, index);
+ }
+ GST_OBJECT_UNLOCK (bin);
+}
+#endif
+
+/* set the clock on all elements in this bin
+ *
+ * MT safe
+ */
+static gboolean
+gst_bin_set_clock_func (GstElement * element, GstClock * clock)
+{
+ GList *children;
+ GstBin *bin;
+ gboolean res = TRUE;
+
+ bin = GST_BIN (element);
+
+ GST_OBJECT_LOCK (bin);
+ if (element->clock != clock) {
+ for (children = bin->children; children; children = g_list_next (children)) {
+ GstElement *child = GST_ELEMENT (children->data);
+
+ res &= gst_element_set_clock (child, clock);
+ }
+ }
+ GST_OBJECT_UNLOCK (bin);
+
+ return res;
+}
+
+/* get the clock for this bin by asking all of the children in this bin
+ *
+ * The ref of the returned clock in increased so unref after usage.
+ *
+ * We loop the elements in state order and pick the last clock we can
+ * get. This makes sure we get a clock from the source.
+ *
+ * MT safe
+ */
+static GstClock *
+gst_bin_provide_clock_func (GstElement * element)
+{
+ GstClock *result = NULL;
+ GstElement *provider = NULL;
+ GstBin *bin;
+ GstIterator *it;
+ gpointer val;
+ GstClock **provided_clock_p;
+ GstElement **clock_provider_p;
+
+ bin = GST_BIN (element);
+
+ GST_OBJECT_LOCK (bin);
+ if (!bin->clock_dirty)
+ goto not_dirty;
+
+ GST_DEBUG_OBJECT (bin, "finding new clock");
+
+ it = gst_bin_sort_iterator_new (bin);
+
+ while (it->next (it, &val) == GST_ITERATOR_OK) {
+ GstElement *child = GST_ELEMENT_CAST (val);
+ GstClock *clock;
+
+ clock = gst_element_provide_clock (child);
+ if (clock) {
+ GST_DEBUG_OBJECT (bin, "found candidate clock %p by element %s",
+ clock, GST_ELEMENT_NAME (child));
+ if (result) {
+ gst_object_unref (result);
+ gst_object_unref (provider);
+ }
+ result = clock;
+ provider = child;
+ } else {
+ gst_object_unref (child);
+ }
+ }
+
+ provided_clock_p = &bin->provided_clock;
+ clock_provider_p = &bin->clock_provider;
+ gst_object_replace ((GstObject **) provided_clock_p, (GstObject *) result);
+ gst_object_replace ((GstObject **) clock_provider_p, (GstObject *) provider);
+ bin->clock_dirty = FALSE;
+ GST_DEBUG_OBJECT (bin,
+ "provided new clock %" GST_PTR_FORMAT " by provider %" GST_PTR_FORMAT,
+ result, provider);
+ /* Provider is not being returned to caller, just the result */
+ if (provider)
+ gst_object_unref (provider);
+ GST_OBJECT_UNLOCK (bin);
+
+ gst_iterator_free (it);
+
+ return result;
+
+not_dirty:
+ {
+ if ((result = bin->provided_clock))
+ gst_object_ref (result);
+ GST_DEBUG_OBJECT (bin, "returning old clock %p", result);
+ GST_OBJECT_UNLOCK (bin);
+
+ return result;
+ }
+}
+
+/*
+ * functions for manipulating cached messages
+ */
+typedef struct
+{
+ GstObject *src;
+ GstMessageType types;
+} MessageFind;
+
+/* check if a message is of given src and type */
+static gint
+message_check (GstMessage * message, MessageFind * target)
+{
+ gboolean eq = TRUE;
+
+ if (target->src)
+ eq &= GST_MESSAGE_SRC (message) == target->src;
+ if (target->types)
+ eq &= (GST_MESSAGE_TYPE (message) & target->types) != 0;
+
+ return (eq ? 0 : 1);
+}
+
+static GList *
+find_message (GstBin * bin, GstObject * src, GstMessageType types)
+{
+ GList *result;
+ MessageFind find;
+
+ find.src = src;
+ find.types = types;
+
+ result = g_list_find_custom (bin->messages, &find,
+ (GCompareFunc) message_check);
+
+ if (result) {
+ GST_DEBUG_OBJECT (bin, "we found a message %p from %s matching types %08x",
+ result->data, GST_OBJECT_NAME (GST_MESSAGE_CAST (result->data)->src),
+ types);
+ } else {
+ GST_DEBUG_OBJECT (bin, "no message found matching types %08x", types);
+#ifndef GST_DISABLE_GST_DEBUG
+ {
+ guint i;
+
+ for (i = 0; i < 32; i++)
+ if (types & (1 << i))
+ GST_DEBUG_OBJECT (bin, " %s", gst_message_type_get_name (1 << i));
+ }
+#endif
+ }
+
+ return result;
+}
+
+/* with LOCK, returns TRUE if message had a valid SRC, takes ref on
+ * the message.
+ *
+ * A message that is cached and has the same SRC and type is replaced
+ * by the given message.
+ */
+static gboolean
+bin_replace_message (GstBin * bin, GstMessage * message, GstMessageType types)
+{
+ GList *previous;
+ GstObject *src;
+ gboolean res = TRUE;
+ const gchar *name;
+
+ name = GST_MESSAGE_TYPE_NAME (message);
+
+ if ((src = GST_MESSAGE_SRC (message))) {
+ /* first find the previous message posted by this element */
+ if ((previous = find_message (bin, src, types))) {
+ /* if we found a previous message, replace it */
+ gst_message_unref (previous->data);
+ previous->data = message;
+
+ GST_DEBUG_OBJECT (bin, "replace old message %s from %s",
+ name, GST_ELEMENT_NAME (src));
+ } else {
+ /* keep new message */
+ bin->messages = g_list_prepend (bin->messages, message);
+
+ GST_DEBUG_OBJECT (bin, "got new message %p, %s from %s",
+ message, name, GST_ELEMENT_NAME (src));
+ }
+ } else {
+ GST_DEBUG_OBJECT (bin, "got message %s from (NULL), not processing", name);
+ res = FALSE;
+ gst_message_unref (message);
+ }
+ return res;
+}
+
+/* with LOCK. Remove all messages of given types */
+static void
+bin_remove_messages (GstBin * bin, GstObject * src, GstMessageType types)
+{
+ MessageFind find;
+ GList *walk, *next;
+
+ find.src = src;
+ find.types = types;
+
+ for (walk = bin->messages; walk; walk = next) {
+ GstMessage *message = (GstMessage *) walk->data;
+
+ next = g_list_next (walk);
+
+ if (message_check (message, &find) == 0) {
+ GST_DEBUG_OBJECT (GST_MESSAGE_SRC (message),
+ "deleting message %p of types 0x%08x", message, types);
+ bin->messages = g_list_delete_link (bin->messages, walk);
+ gst_message_unref (message);
+ } else {
+ GST_DEBUG_OBJECT (GST_MESSAGE_SRC (message),
+ "not deleting message %p of type 0x%08x", message,
+ GST_MESSAGE_TYPE (message));
+ }
+ }
+}
+
+
+/* Check if the bin is EOS. We do this by scanning all sinks and
+ * checking if they posted an EOS message.
+ *
+ * call with bin LOCK */
+static gboolean
+is_eos (GstBin * bin)
+{
+ gboolean result;
+ GList *walk;
+
+ result = TRUE;
+ for (walk = bin->children; walk; walk = g_list_next (walk)) {
+ GstElement *element;
+
+ element = GST_ELEMENT_CAST (walk->data);
+ if (bin_element_is_sink (element, bin) == 0) {
+ /* check if element posted EOS */
+ if (find_message (bin, GST_OBJECT_CAST (element), GST_MESSAGE_EOS)) {
+ GST_DEBUG ("sink '%s' posted EOS", GST_ELEMENT_NAME (element));
+ } else {
+ GST_DEBUG ("sink '%s' did not post EOS yet",
+ GST_ELEMENT_NAME (element));
+ result = FALSE;
+ break;
+ }
+ }
+ }
+ return result;
+}
+
+static void
+unlink_pads (GstPad * pad)
+{
+ GstPad *peer;
+
+ if ((peer = gst_pad_get_peer (pad))) {
+ if (gst_pad_get_direction (pad) == GST_PAD_SRC)
+ gst_pad_unlink (pad, peer);
+ else
+ gst_pad_unlink (peer, pad);
+ gst_object_unref (peer);
+ }
+ gst_object_unref (pad);
+}
+
+/* vmethod that adds an element to a bin
+ *
+ * MT safe
+ */
+static gboolean
+gst_bin_add_func (GstBin * bin, GstElement * element)
+{
+ gchar *elem_name;
+ GstIterator *it;
+ gboolean is_sink;
+ GstMessage *clock_message = NULL, *async_message = NULL;
+ GstStateChangeReturn ret;
+
+ GST_DEBUG_OBJECT (bin, "element :%s", GST_ELEMENT_NAME (element));
+
+ /* we obviously can't add ourself to ourself */
+ if (G_UNLIKELY (GST_ELEMENT_CAST (element) == GST_ELEMENT_CAST (bin)))
+ goto adding_itself;
+
+ /* get the element name to make sure it is unique in this bin. */
+ GST_OBJECT_LOCK (element);
+ elem_name = g_strdup (GST_ELEMENT_NAME (element));
+ is_sink = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_IS_SINK);
+ GST_OBJECT_UNLOCK (element);
+
+ GST_OBJECT_LOCK (bin);
+
+ /* then check to see if the element's name is already taken in the bin,
+ * we can safely take the lock here. This check is probably bogus because
+ * you can safely change the element name after this check and before setting
+ * the object parent. The window is very small though... */
+ if (G_UNLIKELY (!gst_object_check_uniqueness (bin->children, elem_name)))
+ goto duplicate_name;
+
+ /* set the element's parent and add the element to the bin's list of children */
+ if (G_UNLIKELY (!gst_object_set_parent (GST_OBJECT_CAST (element),
+ GST_OBJECT_CAST (bin))))
+ goto had_parent;
+
+ /* if we add a sink we become a sink */
+ if (is_sink) {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, bin, "element \"%s\" was sink",
+ elem_name);
+ GST_OBJECT_FLAG_SET (bin, GST_ELEMENT_IS_SINK);
+ }
+ if (gst_element_provides_clock (element)) {
+ GST_DEBUG_OBJECT (bin, "element \"%s\" can provide a clock", elem_name);
+ clock_message =
+ gst_message_new_clock_provide (GST_OBJECT_CAST (element), NULL, TRUE);
+ }
+
+ bin->children = g_list_prepend (bin->children, element);
+ bin->numchildren++;
+ bin->children_cookie++;
+
+ /* distribute the bus */
+ gst_element_set_bus (element, bin->child_bus);
+
+ /* propagate the current base_time and clock */
+ gst_element_set_base_time (element, GST_ELEMENT (bin)->base_time);
+ /* it's possible that the element did not accept the clock but
+ * that is not important right now. When the pipeline goes to PLAYING,
+ * a new clock will be selected */
+ gst_element_set_clock (element, GST_ELEMENT_CLOCK (bin));
+
+ ret = GST_STATE_RETURN (bin);
+ /* no need to update the state if we are in error */
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ goto no_state_recalc;
+
+ /* update the bin state, the new element could have been an ASYNC or
+ * NO_PREROLL element */
+ ret = GST_STATE_RETURN (element);
+ GST_DEBUG_OBJECT (bin, "added %s element",
+ gst_element_state_change_return_get_name (ret));
+
+ switch (ret) {
+ case GST_STATE_CHANGE_ASYNC:
+ {
+ /* create message to track this aync element when it posts an async-done
+ * message */
+ async_message =
+ gst_message_new_async_start (GST_OBJECT_CAST (element), FALSE);
+ break;
+ }
+ case GST_STATE_CHANGE_NO_PREROLL:
+ /* ignore all async elements we might have and commit our state */
+ bin_handle_async_done (bin, ret);
+ break;
+ case GST_STATE_CHANGE_FAILURE:
+ break;
+ default:
+ break;
+ }
+
+no_state_recalc:
+ GST_OBJECT_UNLOCK (bin);
+
+ /* post the messages on the bus of the element so that the bin can handle
+ * them */
+ if (clock_message)
+ gst_element_post_message (GST_ELEMENT_CAST (element), clock_message);
+
+ if (async_message)
+ gst_element_post_message (GST_ELEMENT_CAST (element), async_message);
+
+ /* unlink all linked pads */
+ it = gst_element_iterate_pads (element);
+ gst_iterator_foreach (it, (GFunc) unlink_pads, element);
+ gst_iterator_free (it);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, bin, "added element \"%s\"",
+ elem_name);
+ g_free (elem_name);
+
+ g_signal_emit (G_OBJECT (bin), gst_bin_signals[ELEMENT_ADDED], 0, element);
+
+ return TRUE;
+
+ /* ERROR handling here */
+adding_itself:
+ {
+ GST_OBJECT_LOCK (bin);
+ g_warning ("Cannot add bin %s to itself", GST_ELEMENT_NAME (bin));
+ GST_OBJECT_UNLOCK (bin);
+ return FALSE;
+ }
+duplicate_name:
+ {
+ g_warning ("Name %s is not unique in bin %s, not adding",
+ elem_name, GST_ELEMENT_NAME (bin));
+ GST_OBJECT_UNLOCK (bin);
+ g_free (elem_name);
+ return FALSE;
+ }
+had_parent:
+ {
+ g_warning ("Element %s already has parent", elem_name);
+ GST_OBJECT_UNLOCK (bin);
+ g_free (elem_name);
+ return FALSE;
+ }
+}
+
+/**
+ * gst_bin_add:
+ * @bin: a #GstBin
+ * @element: the #GstElement to add
+ *
+ * Adds the given element to the bin. Sets the element's parent, and thus
+ * takes ownership of the element. An element can only be added to one bin.
+ *
+ * If the element's pads are linked to other pads, the pads will be unlinked
+ * before the element is added to the bin.
+ *
+ * MT safe.
+ *
+ * Returns: TRUE if the element could be added, FALSE if
+ * the bin does not want to accept the element.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_bin_add (GstBin * bin, GstElement * element)
+{
+ GstBinClass *bclass;
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ bclass = GST_BIN_GET_CLASS (bin);
+
+ if (G_UNLIKELY (bclass->add_element == NULL))
+ goto no_function;
+
+ GST_CAT_DEBUG (GST_CAT_PARENTAGE, "adding element %s to bin %s",
+ GST_STR_NULL (GST_ELEMENT_NAME (element)),
+ GST_STR_NULL (GST_ELEMENT_NAME (bin)));
+
+ result = bclass->add_element (bin, element);
+
+ return result;
+
+ /* ERROR handling */
+no_function:
+ {
+ g_warning ("adding elements to bin %s is not supported",
+ GST_ELEMENT_NAME (bin));
+ return FALSE;
+ }
+}
+
+/* remove an element from the bin
+ *
+ * MT safe
+ */
+static gboolean
+gst_bin_remove_func (GstBin * bin, GstElement * element)
+{
+ gchar *elem_name;
+ GstIterator *it;
+ gboolean is_sink, othersink, found;
+ GstMessage *clock_message = NULL;
+ GList *walk, *next;
+ gboolean other_async, this_async, have_no_preroll;
+ GstStateChangeReturn ret;
+
+ GST_DEBUG_OBJECT (bin, "element :%s", GST_ELEMENT_NAME (element));
+
+ GST_OBJECT_LOCK (element);
+ /* Check if the element is already being removed and immediately
+ * return */
+ if (G_UNLIKELY (GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_UNPARENTING)))
+ goto already_removing;
+
+ GST_OBJECT_FLAG_SET (element, GST_ELEMENT_UNPARENTING);
+ /* grab element name so we can print it */
+ elem_name = g_strdup (GST_ELEMENT_NAME (element));
+ is_sink = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_IS_SINK);
+ GST_OBJECT_UNLOCK (element);
+
+ /* unlink all linked pads */
+ it = gst_element_iterate_pads (element);
+ gst_iterator_foreach (it, (GFunc) unlink_pads, element);
+ gst_iterator_free (it);
+
+ GST_OBJECT_LOCK (bin);
+ found = FALSE;
+ othersink = FALSE;
+ have_no_preroll = FALSE;
+ /* iterate the elements, we collect which ones are async and no_preroll. We
+ * also remove the element when we find it. */
+ for (walk = bin->children; walk; walk = next) {
+ GstElement *child = GST_ELEMENT_CAST (walk->data);
+
+ next = g_list_next (walk);
+
+ if (child == element) {
+ found = TRUE;
+ /* remove the element */
+ bin->children = g_list_delete_link (bin->children, walk);
+ } else {
+ gboolean child_sink;
+
+ GST_OBJECT_LOCK (child);
+ child_sink = GST_OBJECT_FLAG_IS_SET (child, GST_ELEMENT_IS_SINK);
+ /* when we remove a sink, check if there are other sinks. */
+ if (is_sink && !othersink && child_sink)
+ othersink = TRUE;
+ /* check if we have NO_PREROLL children */
+ if (GST_STATE_RETURN (child) == GST_STATE_CHANGE_NO_PREROLL)
+ have_no_preroll = TRUE;
+ GST_OBJECT_UNLOCK (child);
+ }
+ }
+
+ /* the element must have been in the bin's list of children */
+ if (G_UNLIKELY (!found))
+ goto not_in_bin;
+
+ /* we now removed the element from the list of elements, increment the cookie
+ * so that others can detect a change in the children list. */
+ bin->numchildren--;
+ bin->children_cookie++;
+
+ if (is_sink && !othersink) {
+ /* we're not a sink anymore */
+ GST_DEBUG_OBJECT (bin, "we removed the last sink");
+ GST_OBJECT_FLAG_UNSET (bin, GST_ELEMENT_IS_SINK);
+ }
+
+ /* if the clock provider for this element is removed, we lost
+ * the clock as well, we need to inform the parent of this
+ * so that it can select a new clock */
+ if (bin->clock_provider == element) {
+ GST_DEBUG_OBJECT (bin, "element \"%s\" provided the clock", elem_name);
+ bin->clock_dirty = TRUE;
+ clock_message =
+ gst_message_new_clock_lost (GST_OBJECT_CAST (bin), bin->provided_clock);
+ }
+
+ /* remove messages for the element, if there was a pending ASYNC_START
+ * message we must see if removing the element caused the bin to lose its
+ * async state. */
+ this_async = FALSE;
+ other_async = FALSE;
+ for (walk = bin->messages; walk; walk = next) {
+ GstMessage *message = (GstMessage *) walk->data;
+ GstElement *src = GST_ELEMENT_CAST (GST_MESSAGE_SRC (message));
+
+ next = g_list_next (walk);
+
+ if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ASYNC_START) {
+ if (src == element)
+ this_async = TRUE;
+ else
+ other_async = TRUE;
+
+ GST_DEBUG_OBJECT (GST_MESSAGE_SRC (message),
+ "looking at message %p", message);
+ }
+ if (src == element) {
+ /* delete all message types */
+ GST_DEBUG_OBJECT (GST_MESSAGE_SRC (message),
+ "deleting message %p of element \"%s\"", message, elem_name);
+ bin->messages = g_list_delete_link (bin->messages, walk);
+ gst_message_unref (message);
+ }
+ }
+
+ /* get last return */
+ ret = GST_STATE_RETURN (bin);
+
+ /* no need to update the state if we are in error */
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ goto no_state_recalc;
+
+ if (!other_async && this_async) {
+ /* all other elements were not async and we removed the async one,
+ * handle the async-done case because we are not async anymore now. */
+ GST_DEBUG_OBJECT (bin,
+ "we removed the last async element, have no_preroll %d",
+ have_no_preroll);
+
+ /* the current state return of the bin depends on if there are no_preroll
+ * elements in the pipeline or not */
+ if (have_no_preroll)
+ ret = GST_STATE_CHANGE_NO_PREROLL;
+ else
+ ret = GST_STATE_CHANGE_SUCCESS;
+
+ bin_handle_async_done (bin, ret);
+ } else {
+ GST_DEBUG_OBJECT (bin,
+ "recalc state preroll: %d, other async: %d, this async %d",
+ have_no_preroll, other_async, this_async);
+
+ if (have_no_preroll) {
+ ret = GST_STATE_CHANGE_NO_PREROLL;
+ } else if (other_async) {
+ /* there are other async elements and we were not doing an async state
+ * change, change our pending state and go async */
+ if (GST_STATE_PENDING (bin) == GST_STATE_VOID_PENDING) {
+ GST_STATE_NEXT (bin) = GST_STATE (bin);
+ GST_STATE_PENDING (bin) = GST_STATE (bin);
+ }
+ ret = GST_STATE_CHANGE_ASYNC;
+ }
+ GST_STATE_RETURN (bin) = ret;
+ }
+no_state_recalc:
+ GST_OBJECT_UNLOCK (bin);
+
+ if (clock_message)
+ gst_element_post_message (GST_ELEMENT_CAST (bin), clock_message);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_PARENTAGE, bin, "removed child \"%s\"",
+ elem_name);
+ g_free (elem_name);
+
+ gst_element_set_bus (element, NULL);
+
+ /* Clear the clock we provided to the element */
+ gst_element_set_clock (element, NULL);
+
+ /* we ref here because after the _unparent() the element can be disposed
+ * and we still need it to reset the UNPARENTING flag and fire a signal. */
+ gst_object_ref (element);
+ gst_object_unparent (GST_OBJECT_CAST (element));
+
+ GST_OBJECT_LOCK (element);
+ GST_OBJECT_FLAG_UNSET (element, GST_ELEMENT_UNPARENTING);
+ GST_OBJECT_UNLOCK (element);
+
+ g_signal_emit (G_OBJECT (bin), gst_bin_signals[ELEMENT_REMOVED], 0, element);
+
+ /* element is really out of our control now */
+ gst_object_unref (element);
+
+ return TRUE;
+
+ /* ERROR handling */
+not_in_bin:
+ {
+ g_warning ("Element %s is not in bin %s", elem_name,
+ GST_ELEMENT_NAME (bin));
+ GST_OBJECT_UNLOCK (bin);
+ g_free (elem_name);
+ return FALSE;
+ }
+already_removing:
+ {
+ GST_CAT_INFO_OBJECT (GST_CAT_PARENTAGE, bin, "already removing child");
+ GST_OBJECT_UNLOCK (element);
+ return FALSE;
+ }
+}
+
+/**
+ * gst_bin_remove:
+ * @bin: a #GstBin
+ * @element: the #GstElement to remove
+ *
+ * Removes the element from the bin, unparenting it as well.
+ * Unparenting the element means that the element will be dereferenced,
+ * so if the bin holds the only reference to the element, the element
+ * will be freed in the process of removing it from the bin. If you
+ * want the element to still exist after removing, you need to call
+ * gst_object_ref() before removing it from the bin.
+ *
+ * If the element's pads are linked to other pads, the pads will be unlinked
+ * before the element is removed from the bin.
+ *
+ * MT safe.
+ *
+ * Returns: TRUE if the element could be removed, FALSE if
+ * the bin does not want to remove the element.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_bin_remove (GstBin * bin, GstElement * element)
+{
+ GstBinClass *bclass;
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ bclass = GST_BIN_GET_CLASS (bin);
+
+ if (G_UNLIKELY (bclass->remove_element == NULL))
+ goto no_function;
+
+ GST_CAT_DEBUG (GST_CAT_PARENTAGE, "removing element %s from bin %s",
+ GST_ELEMENT_NAME (element), GST_ELEMENT_NAME (bin));
+
+ result = bclass->remove_element (bin, element);
+
+ return result;
+
+ /* ERROR handling */
+no_function:
+ {
+ g_warning ("removing elements from bin %s is not supported",
+ GST_ELEMENT_NAME (bin));
+ return FALSE;
+ }
+}
+
+static GstIteratorItem
+iterate_child (GstIterator * it, GstElement * child)
+{
+ gst_object_ref (child);
+ return GST_ITERATOR_ITEM_PASS;
+}
+
+/**
+ * gst_bin_iterate_elements:
+ * @bin: a #GstBin
+ *
+ * Gets an iterator for the elements in this bin.
+ *
+ * Each element yielded by the iterator will have its refcount increased, so
+ * unref after use.
+ *
+ * MT safe. Caller owns returned value.
+ *
+ * Returns: a #GstIterator of #GstElement, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_bin_iterate_elements (GstBin * bin)
+{
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+
+ GST_OBJECT_LOCK (bin);
+ /* add ref because the iterator refs the bin. When the iterator
+ * is freed it will unref the bin again using the provided dispose
+ * function. */
+ gst_object_ref (bin);
+ result = gst_iterator_new_list (GST_TYPE_ELEMENT,
+ GST_OBJECT_GET_LOCK (bin),
+ &bin->children_cookie,
+ &bin->children,
+ bin,
+ (GstIteratorItemFunction) iterate_child,
+ (GstIteratorDisposeFunction) gst_object_unref);
+ GST_OBJECT_UNLOCK (bin);
+
+ return result;
+}
+
+static GstIteratorItem
+iterate_child_recurse (GstIterator * it, GstElement * child)
+{
+ gst_object_ref (child);
+ if (GST_IS_BIN (child)) {
+ GstIterator *other = gst_bin_iterate_recurse (GST_BIN (child));
+
+ gst_iterator_push (it, other);
+ }
+ return GST_ITERATOR_ITEM_PASS;
+}
+
+/**
+ * gst_bin_iterate_recurse:
+ * @bin: a #GstBin
+ *
+ * Gets an iterator for the elements in this bin.
+ * This iterator recurses into GstBin children.
+ *
+ * Each element yielded by the iterator will have its refcount increased, so
+ * unref after use.
+ *
+ * MT safe. Caller owns returned value.
+ *
+ * Returns: a #GstIterator of #GstElement, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_bin_iterate_recurse (GstBin * bin)
+{
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+
+ GST_OBJECT_LOCK (bin);
+ /* add ref because the iterator refs the bin. When the iterator
+ * is freed it will unref the bin again using the provided dispose
+ * function. */
+ gst_object_ref (bin);
+ result = gst_iterator_new_list (GST_TYPE_ELEMENT,
+ GST_OBJECT_GET_LOCK (bin),
+ &bin->children_cookie,
+ &bin->children,
+ bin,
+ (GstIteratorItemFunction) iterate_child_recurse,
+ (GstIteratorDisposeFunction) gst_object_unref);
+ GST_OBJECT_UNLOCK (bin);
+
+ return result;
+}
+
+/* returns 0 when TRUE because this is a GCompareFunc */
+/* MT safe */
+static gint
+bin_element_is_sink (GstElement * child, GstBin * bin)
+{
+ gboolean is_sink;
+
+ /* we lock the child here for the remainder of the function to
+ * get its name and flag safely. */
+ GST_OBJECT_LOCK (child);
+ is_sink = GST_OBJECT_FLAG_IS_SET (child, GST_ELEMENT_IS_SINK);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin,
+ "child %s %s sink", GST_OBJECT_NAME (child), is_sink ? "is" : "is not");
+
+ GST_OBJECT_UNLOCK (child);
+ return is_sink ? 0 : 1;
+}
+
+static gint
+sink_iterator_filter (GstElement * child, GstBin * bin)
+{
+ if (bin_element_is_sink (child, bin) == 0) {
+ /* returns 0 because this is a GCompareFunc */
+ return 0;
+ } else {
+ /* child carries a ref from gst_bin_iterate_elements -- drop if not passing
+ through */
+ gst_object_unref (child);
+ return 1;
+ }
+}
+
+/**
+ * gst_bin_iterate_sinks:
+ * @bin: a #GstBin
+ *
+ * Gets an iterator for all elements in the bin that have the
+ * #GST_ELEMENT_IS_SINK flag set.
+ *
+ * Each element yielded by the iterator will have its refcount increased, so
+ * unref after use.
+ *
+ * MT safe. Caller owns returned value.
+ *
+ * Returns: a #GstIterator of #GstElement, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_bin_iterate_sinks (GstBin * bin)
+{
+ GstIterator *children;
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+
+ children = gst_bin_iterate_elements (bin);
+ result = gst_iterator_filter (children,
+ (GCompareFunc) sink_iterator_filter, bin);
+
+ return result;
+}
+
+/* returns 0 when TRUE because this is a GCompareFunc */
+/* MT safe */
+static gint
+bin_element_is_src (GstElement * child, GstBin * bin)
+{
+ gboolean is_src = FALSE;
+
+ /* we lock the child here for the remainder of the function to
+ * get its name and flag safely. */
+ GST_OBJECT_LOCK (child);
+ if (!GST_OBJECT_FLAG_IS_SET (child, GST_ELEMENT_IS_SINK) &&
+ !child->numsinkpads) {
+ is_src = TRUE;
+ }
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin,
+ "child %s %s src", GST_OBJECT_NAME (child), is_src ? "is" : "is not");
+
+ GST_OBJECT_UNLOCK (child);
+ return is_src ? 0 : 1;
+}
+
+static gint
+src_iterator_filter (GstElement * child, GstBin * bin)
+{
+ if (bin_element_is_src (child, bin) == 0) {
+ /* returns 0 because this is a GCompareFunc */
+ return 0;
+ } else {
+ /* child carries a ref from gst_bin_iterate_elements -- drop if not passing
+ through */
+ gst_object_unref (child);
+ return 1;
+ }
+}
+
+/**
+ * gst_bin_iterate_sources:
+ * @bin: a #GstBin
+ *
+ * Gets an iterator for all elements in the bin that have no sinkpads and have
+ * the #GST_ELEMENT_IS_SINK flag unset.
+ *
+ * Each element yielded by the iterator will have its refcount increased, so
+ * unref after use.
+ *
+ * MT safe. Caller owns returned value.
+ *
+ * Returns: a #GstIterator of #GstElement, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_bin_iterate_sources (GstBin * bin)
+{
+ GstIterator *children;
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+
+ children = gst_bin_iterate_elements (bin);
+ result = gst_iterator_filter (children,
+ (GCompareFunc) src_iterator_filter, bin);
+
+ return result;
+}
+
+/*
+ * MT safe
+ */
+static GstStateChangeReturn
+gst_bin_get_state_func (GstElement * element, GstState * state,
+ GstState * pending, GstClockTime timeout)
+{
+ GstStateChangeReturn ret;
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "getting state");
+
+ ret = parent_class->get_state (element, state, pending, timeout);
+
+ return ret;
+}
+
+/***********************************************
+ * Topologically sorted iterator
+ * see http://en.wikipedia.org/wiki/Topological_sorting
+ *
+ * For each element in the graph, an entry is kept in a HashTable
+ * with its number of srcpad connections (degree).
+ * We then change state of all elements without dependencies
+ * (degree 0) and decrement the degree of all elements connected
+ * on the sinkpads. When an element reaches degree 0, its state is
+ * changed next.
+ * When all elements are handled the algorithm stops.
+ */
+typedef struct _GstBinSortIterator
+{
+ GstIterator it;
+ GQueue *queue; /* elements queued for state change */
+ GstBin *bin; /* bin we iterate */
+ gint mode; /* adding or removing dependency */
+ GstElement *best; /* next element with least dependencies */
+ gint best_deg; /* best degree */
+ GHashTable *hash; /* hashtable with element dependencies */
+} GstBinSortIterator;
+
+/* we add and subtract 1 to make sure we don't confuse NULL and 0 */
+#define HASH_SET_DEGREE(bit, elem, deg) \
+ g_hash_table_replace (bit->hash, elem, GINT_TO_POINTER(deg+1))
+#define HASH_GET_DEGREE(bit, elem) \
+ (GPOINTER_TO_INT(g_hash_table_lookup (bit->hash, elem))-1)
+
+/* add element to queue of next elements in the iterator.
+ * We push at the tail to give higher priority elements a
+ * chance first */
+static void
+add_to_queue (GstBinSortIterator * bit, GstElement * element)
+{
+ GST_DEBUG_OBJECT (bit->bin, "adding '%s' to queue",
+ GST_ELEMENT_NAME (element));
+ gst_object_ref (element);
+ g_queue_push_tail (bit->queue, element);
+ HASH_SET_DEGREE (bit, element, -1);
+}
+
+static void
+remove_from_queue (GstBinSortIterator * bit, GstElement * element)
+{
+ GList *find;
+
+ if ((find = g_queue_find (bit->queue, element))) {
+ GST_DEBUG_OBJECT (bit->bin, "removing '%s' from queue",
+ GST_ELEMENT_NAME (element));
+
+ g_queue_delete_link (bit->queue, find);
+ gst_object_unref (element);
+ } else {
+ GST_DEBUG_OBJECT (bit->bin, "unable to remove '%s' from queue",
+ GST_ELEMENT_NAME (element));
+ }
+}
+
+/* clear the queue, unref all objects as we took a ref when
+ * we added them to the queue */
+static void
+clear_queue (GQueue * queue)
+{
+ gpointer p;
+
+ while ((p = g_queue_pop_head (queue)))
+ gst_object_unref (p);
+}
+
+/* set all degrees to 0. Elements marked as a sink are
+ * added to the queue immediatly. Since we only look at the SINK flag of the
+ * element, it is possible that we add non-sinks to the queue. These will be
+ * removed from the queue again when we can prove that it provides data for some
+ * other element. */
+static void
+reset_degree (GstElement * element, GstBinSortIterator * bit)
+{
+ gboolean is_sink;
+
+ /* sinks are added right away */
+ GST_OBJECT_LOCK (element);
+ is_sink = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_IS_SINK);
+ GST_OBJECT_UNLOCK (element);
+
+ if (is_sink) {
+ add_to_queue (bit, element);
+ } else {
+ /* others are marked with 0 and handled when sinks are done */
+ HASH_SET_DEGREE (bit, element, 0);
+ }
+}
+
+/* adjust the degree of all elements connected to the given
+ * element. If a degree of an element drops to 0, it is
+ * added to the queue of elements to schedule next.
+ *
+ * We have to make sure not to cross the bin boundary this element
+ * belongs to.
+ */
+static void
+update_degree (GstElement * element, GstBinSortIterator * bit)
+{
+ gboolean linked = FALSE;
+
+ GST_OBJECT_LOCK (element);
+ /* don't touch degree if element has no sourcepads */
+ if (element->numsinkpads != 0) {
+ /* loop over all sinkpads, decrement degree for all connected
+ * elements in this bin */
+ GList *pads;
+
+ for (pads = element->sinkpads; pads; pads = g_list_next (pads)) {
+ GstPad *peer;
+
+ if ((peer = gst_pad_get_peer (GST_PAD_CAST (pads->data)))) {
+ GstElement *peer_element;
+
+ if ((peer_element = gst_pad_get_parent_element (peer))) {
+ GST_OBJECT_LOCK (peer_element);
+ /* check that we don't go outside of this bin */
+ if (GST_OBJECT_CAST (peer_element)->parent ==
+ GST_OBJECT_CAST (bit->bin)) {
+ gint old_deg, new_deg;
+
+ old_deg = HASH_GET_DEGREE (bit, peer_element);
+
+ /* check to see if we added an element as sink that was not really a
+ * sink because it was connected to some other element. */
+ if (old_deg == -1) {
+ remove_from_queue (bit, peer_element);
+ old_deg = 0;
+ }
+ new_deg = old_deg + bit->mode;
+
+ GST_DEBUG_OBJECT (bit->bin,
+ "change element %s, degree %d->%d, linked to %s",
+ GST_ELEMENT_NAME (peer_element), old_deg, new_deg,
+ GST_ELEMENT_NAME (element));
+
+ /* update degree */
+ if (new_deg == 0) {
+ /* degree hit 0, add to queue */
+ add_to_queue (bit, peer_element);
+ } else {
+ HASH_SET_DEGREE (bit, peer_element, new_deg);
+ }
+ linked = TRUE;
+ }
+ GST_OBJECT_UNLOCK (peer_element);
+ gst_object_unref (peer_element);
+ }
+ gst_object_unref (peer);
+ }
+ }
+ }
+ if (!linked) {
+ GST_DEBUG_OBJECT (bit->bin, "element %s not linked on any sinkpads",
+ GST_ELEMENT_NAME (element));
+ }
+ GST_OBJECT_UNLOCK (element);
+}
+
+/* find the next best element not handled yet. This is the one
+ * with the lowest non-negative degree */
+static void
+find_element (GstElement * element, GstBinSortIterator * bit)
+{
+ gint degree;
+
+ /* element is already handled */
+ if ((degree = HASH_GET_DEGREE (bit, element)) < 0)
+ return;
+
+ /* first element or element with smaller degree */
+ if (bit->best == NULL || bit->best_deg > degree) {
+ bit->best = element;
+ bit->best_deg = degree;
+ }
+}
+
+/* get next element in iterator. the returned element has the
+ * refcount increased */
+static GstIteratorResult
+gst_bin_sort_iterator_next (GstBinSortIterator * bit, gpointer * result)
+{
+ GstBin *bin = bit->bin;
+
+ /* empty queue, we have to find a next best element */
+ if (g_queue_is_empty (bit->queue)) {
+ GstElement *best;
+
+ bit->best = NULL;
+ bit->best_deg = G_MAXINT;
+ g_list_foreach (bin->children, (GFunc) find_element, bit);
+ if ((best = bit->best)) {
+ if (bit->best_deg != 0) {
+ /* we don't fail on this one yet */
+ GST_WARNING_OBJECT (bin, "loop dected in graph");
+ g_warning ("loop detected in the graph of bin %s!!",
+ GST_ELEMENT_NAME (bin));
+ }
+ /* best unhandled element, schedule as next element */
+ GST_DEBUG_OBJECT (bin, "queue empty, next best: %s",
+ GST_ELEMENT_NAME (best));
+ gst_object_ref (best);
+ HASH_SET_DEGREE (bit, best, -1);
+ *result = best;
+ } else {
+ GST_DEBUG_OBJECT (bin, "queue empty, elements exhausted");
+ /* no more unhandled elements, we are done */
+ return GST_ITERATOR_DONE;
+ }
+ } else {
+ /* everything added to the queue got reffed */
+ *result = g_queue_pop_head (bit->queue);
+ }
+
+ GST_DEBUG_OBJECT (bin, "queue head gives %s", GST_ELEMENT_NAME (*result));
+ /* update degrees of linked elements */
+ update_degree (GST_ELEMENT_CAST (*result), bit);
+
+ return GST_ITERATOR_OK;
+}
+
+/* clear queues, recalculate the degrees and restart. */
+static void
+gst_bin_sort_iterator_resync (GstBinSortIterator * bit)
+{
+ GstBin *bin = bit->bin;
+
+ GST_DEBUG_OBJECT (bin, "resync");
+ clear_queue (bit->queue);
+ /* reset degrees */
+ g_list_foreach (bin->children, (GFunc) reset_degree, bit);
+ /* calc degrees, incrementing */
+ bit->mode = 1;
+ g_list_foreach (bin->children, (GFunc) update_degree, bit);
+ /* for the rest of the function we decrement the degrees */
+ bit->mode = -1;
+}
+
+/* clear queues, unref bin and free iterator. */
+static void
+gst_bin_sort_iterator_free (GstBinSortIterator * bit)
+{
+ GstBin *bin = bit->bin;
+
+ GST_DEBUG_OBJECT (bin, "free");
+ clear_queue (bit->queue);
+ g_queue_free (bit->queue);
+ g_hash_table_destroy (bit->hash);
+ gst_object_unref (bin);
+ g_free (bit);
+}
+
+/* should be called with the bin LOCK held */
+static GstIterator *
+gst_bin_sort_iterator_new (GstBin * bin)
+{
+ GstBinSortIterator *result;
+
+ /* we don't need an ItemFunction because we ref the items in the _next
+ * method already */
+ result = (GstBinSortIterator *)
+ gst_iterator_new (sizeof (GstBinSortIterator),
+ GST_TYPE_ELEMENT,
+ GST_OBJECT_GET_LOCK (bin),
+ &bin->children_cookie,
+ (GstIteratorNextFunction) gst_bin_sort_iterator_next,
+ (GstIteratorItemFunction) NULL,
+ (GstIteratorResyncFunction) gst_bin_sort_iterator_resync,
+ (GstIteratorFreeFunction) gst_bin_sort_iterator_free);
+ result->queue = g_queue_new ();
+ result->hash = g_hash_table_new (NULL, NULL);
+ gst_object_ref (bin);
+ result->bin = bin;
+ gst_bin_sort_iterator_resync (result);
+
+ return (GstIterator *) result;
+}
+
+/**
+ * gst_bin_iterate_sorted:
+ * @bin: a #GstBin
+ *
+ * Gets an iterator for the elements in this bin in topologically
+ * sorted order. This means that the elements are returned from
+ * the most downstream elements (sinks) to the sources.
+ *
+ * This function is used internally to perform the state changes
+ * of the bin elements and for clock selection.
+ *
+ * Each element yielded by the iterator will have its refcount increased, so
+ * unref after use.
+ *
+ * MT safe. Caller owns returned value.
+ *
+ * Returns: a #GstIterator of #GstElement, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_bin_iterate_sorted (GstBin * bin)
+{
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+
+ GST_OBJECT_LOCK (bin);
+ result = gst_bin_sort_iterator_new (bin);
+ GST_OBJECT_UNLOCK (bin);
+
+ return result;
+}
+
+static GstStateChangeReturn
+gst_bin_element_set_state (GstBin * bin, GstElement * element,
+ GstClockTime base_time, GstState current, GstState next)
+{
+ GstStateChangeReturn ret;
+ gboolean locked;
+ GList *found;
+
+ /* peel off the locked flag */
+ GST_OBJECT_LOCK (element);
+ locked = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
+ /* get previous state return */
+ ret = GST_STATE_RETURN (element);
+ GST_OBJECT_UNLOCK (element);
+
+ /* skip locked elements */
+ if (G_UNLIKELY (locked))
+ goto locked;
+
+ /* if the element was no preroll, just start changing the state regardless
+ * if it had async elements (in the case of a bin) because they won't preroll
+ * anyway. */
+ if (G_UNLIKELY (ret == GST_STATE_CHANGE_NO_PREROLL)) {
+ GST_DEBUG_OBJECT (element, "element is NO_PREROLL, ignore async elements");
+ goto no_preroll;
+ }
+
+ GST_OBJECT_LOCK (bin);
+ /* the element was busy with an upwards async state change, we must wait for
+ * an ASYNC_DONE message before we attemp to change the state. */
+ if ((found =
+ find_message (bin, GST_OBJECT_CAST (element),
+ GST_MESSAGE_ASYNC_START))) {
+#ifndef GST_DISABLE_GST_DEBUG
+ GstMessage *message = GST_MESSAGE_CAST (found->data);
+
+ GST_DEBUG_OBJECT (element, "element message %p, %s async busy",
+ message, GST_ELEMENT_NAME (GST_MESSAGE_SRC (message)));
+#endif
+ /* only wait for upward state changes */
+ if (next > current) {
+ /* We found an async element check if we can force its state to change or
+ * if we have to wait for it to preroll. */
+ if (G_UNLIKELY (!enable_latency)) {
+ g_warning ("Future versions of GStreamer will wait for element \"%s\"\n"
+ "\tto preroll in order to perform correct latency calculations.\n"
+ "\tPlease verify that the application continues to work correctly by\n"
+ "\tsetting the environment variable GST_COMPAT to a value containing\n"
+ "\tthe string 'live-preroll'.", GST_ELEMENT_NAME (element));
+ goto no_latency;
+ }
+ goto was_busy;
+ }
+ }
+no_latency:
+ GST_OBJECT_UNLOCK (bin);
+
+no_preroll:
+ GST_DEBUG_OBJECT (bin,
+ "setting element %s to %s, base_time %" GST_TIME_FORMAT,
+ GST_ELEMENT_NAME (element), gst_element_state_get_name (next),
+ GST_TIME_ARGS (base_time));
+
+ /* set base_time on child */
+ gst_element_set_base_time (element, base_time);
+
+ /* change state */
+ ret = gst_element_set_state (element, next);
+
+ return ret;
+
+locked:
+ {
+ GST_DEBUG_OBJECT (element,
+ "element is locked, return previous return %s",
+ gst_element_state_change_return_get_name (ret));
+ return ret;
+ }
+was_busy:
+ {
+ GST_DEBUG_OBJECT (element, "element was busy, delaying state change");
+ GST_OBJECT_UNLOCK (bin);
+ return GST_STATE_CHANGE_ASYNC;
+ }
+}
+
+/* gst_iterator_fold functions for pads_activate
+ * Note how we don't stop the iterator when we fail an activation. This is
+ * probably a FIXME since when one pad activation fails, we don't want to
+ * continue our state change. */
+static gboolean
+activate_pads (GstPad * pad, GValue * ret, gboolean * active)
+{
+ if (!gst_pad_set_active (pad, *active))
+ g_value_set_boolean (ret, FALSE);
+ else if (!*active)
+ gst_pad_set_caps (pad, NULL);
+
+ /* unref the object that was reffed for us by _fold */
+ gst_object_unref (pad);
+ return TRUE;
+}
+
+/* returns false on error or early cutout (will never happen because the fold
+ * function always returns TRUE, see FIXME above) of the fold, true if all
+ * pads in @iter were (de)activated successfully. */
+static gboolean
+iterator_activate_fold_with_resync (GstIterator * iter, gpointer user_data)
+{
+ GstIteratorResult ires;
+ GValue ret = { 0 };
+
+ /* no need to unset this later, it's just a boolean */
+ g_value_init (&ret, G_TYPE_BOOLEAN);
+ g_value_set_boolean (&ret, TRUE);
+
+ while (1) {
+ ires = gst_iterator_fold (iter, (GstIteratorFoldFunction) activate_pads,
+ &ret, user_data);
+ switch (ires) {
+ case GST_ITERATOR_RESYNC:
+ /* need to reset the result again */
+ g_value_set_boolean (&ret, TRUE);
+ gst_iterator_resync (iter);
+ break;
+ case GST_ITERATOR_DONE:
+ /* all pads iterated, return collected value */
+ goto done;
+ default:
+ /* iterator returned _ERROR or premature end with _OK,
+ * mark an error and exit */
+ g_value_set_boolean (&ret, FALSE);
+ goto done;
+ }
+ }
+done:
+ /* return collected value */
+ return g_value_get_boolean (&ret);
+}
+
+/* is called with STATE_LOCK
+ */
+static gboolean
+gst_bin_src_pads_activate (GstBin * bin, gboolean active)
+{
+ GstIterator *iter;
+ gboolean fold_ok;
+
+ GST_DEBUG_OBJECT (bin, "src_pads_activate with active %d", active);
+
+ iter = gst_element_iterate_src_pads ((GstElement *) bin);
+ fold_ok = iterator_activate_fold_with_resync (iter, &active);
+ gst_iterator_free (iter);
+ if (G_UNLIKELY (!fold_ok))
+ goto failed;
+
+ GST_DEBUG_OBJECT (bin, "pads_activate successful");
+
+ return TRUE;
+
+ /* ERRORS */
+failed:
+ {
+ GST_DEBUG_OBJECT (bin, "source pads_activate failed");
+ return FALSE;
+ }
+}
+
+/* do latency correction. We do a latency query on the bin, and then send a
+ * LATENCY event on the elements fo configure them */
+static gboolean
+do_bin_latency (GstElement * element)
+{
+ GstQuery *query;
+ GstClockTime min_latency, max_latency;
+ gboolean res;
+
+ GST_DEBUG_OBJECT (element, "querying latency");
+
+ query = gst_query_new_latency ();
+ if ((res = gst_element_query (element, query))) {
+ gboolean live;
+
+ gst_query_parse_latency (query, &live, &min_latency, &max_latency);
+
+ GST_DEBUG_OBJECT (element,
+ "got min latency %" GST_TIME_FORMAT ", max latency %"
+ GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (min_latency),
+ GST_TIME_ARGS (max_latency), live);
+
+ if (max_latency < min_latency) {
+ /* this is an impossible situation, some parts of the pipeline might not
+ * work correctly. We post a warning for now. */
+ GST_ELEMENT_WARNING (element, CORE, CLOCK, (NULL),
+ ("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
+ GST_TIME_FORMAT ". Add queues or other buffering elements.",
+ GST_TIME_ARGS (max_latency), GST_TIME_ARGS (min_latency)));
+ }
+
+ /* configure latency on elements */
+ res = gst_element_send_event (element, gst_event_new_latency (min_latency));
+ if (res) {
+ GST_INFO_OBJECT (element, "configured latency of %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (min_latency));
+ } else {
+ GST_WARNING_OBJECT (element,
+ "failed to configure latency of %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (min_latency));
+ GST_ELEMENT_WARNING (element, CORE, CLOCK, (NULL),
+ ("Failed to configure latency of %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (min_latency)));
+ }
+ } else {
+ /* this is not a real problem, we just don't configure any latency. */
+ GST_WARNING_OBJECT (element, "failed to query latency");
+ }
+ gst_query_unref (query);
+
+ return res;
+}
+
+static GstStateChangeReturn
+gst_bin_change_state_func (GstElement * element, GstStateChange transition)
+{
+ GstBin *bin;
+ GstStateChangeReturn ret;
+ GstState current, next;
+ gboolean have_async;
+ gboolean have_no_preroll;
+ GstClockTime base_time;
+ GstIterator *it;
+ gboolean done;
+
+ /* we don't need to take the STATE_LOCK, it is already taken */
+ current = (GstState) GST_STATE_TRANSITION_CURRENT (transition);
+ next = (GstState) GST_STATE_TRANSITION_NEXT (transition);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "changing state of children from %s to %s",
+ gst_element_state_get_name (current), gst_element_state_get_name (next));
+
+ bin = GST_BIN_CAST (element);
+
+ switch (next) {
+ case GST_STATE_PLAYING:
+ {
+ gboolean toplevel;
+
+ GST_OBJECT_LOCK (bin);
+ toplevel = BIN_IS_TOPLEVEL (bin);
+ GST_OBJECT_UNLOCK (bin);
+
+ if (toplevel)
+ do_bin_latency (element);
+ break;
+ }
+ case GST_STATE_PAUSED:
+ /* Clear EOS list on next PAUSED */
+ GST_OBJECT_LOCK (bin);
+ GST_DEBUG_OBJECT (element, "clearing EOS elements");
+ bin_remove_messages (bin, NULL, GST_MESSAGE_EOS);
+ GST_OBJECT_UNLOCK (bin);
+ if (current == GST_STATE_READY)
+ if (!(gst_bin_src_pads_activate (bin, TRUE)))
+ goto activate_failure;
+ break;
+ case GST_STATE_READY:
+ /* Clear message list on next READY */
+ GST_OBJECT_LOCK (bin);
+ GST_DEBUG_OBJECT (element, "clearing all cached messages");
+ bin_remove_messages (bin, NULL, GST_MESSAGE_ANY);
+ GST_OBJECT_UNLOCK (bin);
+ if (current == GST_STATE_PAUSED)
+ if (!(gst_bin_src_pads_activate (bin, FALSE)))
+ goto activate_failure;
+ break;
+ case GST_STATE_NULL:
+ if (current == GST_STATE_READY)
+ if (!(gst_bin_src_pads_activate (bin, FALSE)))
+ goto activate_failure;
+ break;
+ default:
+ break;
+ }
+
+ /* this flag is used to make the async state changes return immediatly. We
+ * don't want them to interfere with this state change */
+ GST_OBJECT_LOCK (bin);
+ bin->polling = TRUE;
+ GST_OBJECT_UNLOCK (bin);
+
+ /* iterate in state change order */
+ it = gst_bin_iterate_sorted (bin);
+
+ /* mark if we've seen an ASYNC element in the bin when we did a state change.
+ * Note how we don't reset this value when a resync happens, the reason being
+ * that the async element posted ASYNC_START and we want to post ASYNC_DONE
+ * even after a resync when the async element is gone */
+ have_async = FALSE;
+
+restart:
+ /* take base_time */
+ base_time = gst_element_get_base_time (element);
+
+ have_no_preroll = FALSE;
+
+ done = FALSE;
+ while (!done) {
+ gpointer data;
+
+ switch (gst_iterator_next (it, &data)) {
+ case GST_ITERATOR_OK:
+ {
+ GstElement *child;
+
+ child = GST_ELEMENT_CAST (data);
+
+ /* set state and base_time now */
+ ret = gst_bin_element_set_state (bin, child, base_time, current, next);
+
+ switch (ret) {
+ case GST_STATE_CHANGE_SUCCESS:
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "child '%s' changed state to %d(%s) successfully",
+ GST_ELEMENT_NAME (child), next,
+ gst_element_state_get_name (next));
+ break;
+ case GST_STATE_CHANGE_ASYNC:
+ {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "child '%s' is changing state asynchronously to %s",
+ GST_ELEMENT_NAME (child), gst_element_state_get_name (next));
+ have_async = TRUE;
+ break;
+ }
+ case GST_STATE_CHANGE_FAILURE:
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "child '%s' failed to go to state %d(%s)",
+ GST_ELEMENT_NAME (child),
+ next, gst_element_state_get_name (next));
+ gst_object_unref (child);
+ goto done;
+ case GST_STATE_CHANGE_NO_PREROLL:
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "child '%s' changed state to %d(%s) successfully without preroll",
+ GST_ELEMENT_NAME (child), next,
+ gst_element_state_get_name (next));
+ have_no_preroll = TRUE;
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ gst_object_unref (child);
+ break;
+ }
+ case GST_ITERATOR_RESYNC:
+ GST_CAT_DEBUG (GST_CAT_STATES, "iterator doing resync");
+ gst_iterator_resync (it);
+ goto restart;
+ default:
+ case GST_ITERATOR_DONE:
+ GST_CAT_DEBUG (GST_CAT_STATES, "iterator done");
+ done = TRUE;
+ break;
+ }
+ }
+
+ ret = parent_class->change_state (element, transition);
+ if (G_UNLIKELY (ret == GST_STATE_CHANGE_FAILURE))
+ goto done;
+
+ if (have_no_preroll) {
+ ret = GST_STATE_CHANGE_NO_PREROLL;
+ } else if (have_async) {
+ ret = GST_STATE_CHANGE_ASYNC;
+ }
+
+done:
+ gst_iterator_free (it);
+
+ GST_OBJECT_LOCK (bin);
+ bin->polling = FALSE;
+ if (ret != GST_STATE_CHANGE_ASYNC) {
+ /* no element returned ASYNC, we can just complete. */
+ GST_DEBUG_OBJECT (bin, "no async elements");
+ goto state_end;
+ }
+ /* when we get here an ASYNC element was found */
+ if (GST_STATE_TARGET (bin) <= GST_STATE_READY) {
+ /* we ignore ASYNC state changes when we go to READY or NULL */
+ GST_DEBUG_OBJECT (bin, "target state %s <= READY",
+ gst_element_state_get_name (GST_STATE_TARGET (bin)));
+ goto state_end;
+ }
+
+ GST_DEBUG_OBJECT (bin, "check async elements");
+ /* check if all elements managed to commit their state already */
+ if (!find_message (bin, NULL, GST_MESSAGE_ASYNC_START)) {
+ /* nothing found, remove all old ASYNC_DONE messages. This can happen when
+ * all the elements commited their state while we were doing the state
+ * change. We will still return ASYNC for consistency but we commit the
+ * state already so that a _get_state() will return immediatly. */
+ bin_remove_messages (bin, NULL, GST_MESSAGE_ASYNC_DONE);
+
+ GST_DEBUG_OBJECT (bin, "async elements commited");
+ bin_handle_async_done (bin, GST_STATE_CHANGE_SUCCESS);
+ }
+
+state_end:
+ GST_OBJECT_UNLOCK (bin);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "done changing bin's state from %s to %s, now in %s, ret %s",
+ gst_element_state_get_name (current),
+ gst_element_state_get_name (next),
+ gst_element_state_get_name (GST_STATE (element)),
+ gst_element_state_change_return_get_name (ret));
+
+ return ret;
+
+ /* ERRORS */
+activate_failure:
+ {
+ GST_CAT_WARNING_OBJECT (GST_CAT_STATES, element,
+ "failure (de)activating src pads");
+ return GST_STATE_CHANGE_FAILURE;
+ }
+}
+
+/*
+ * This function is a utility event handler for seek events.
+ * It will send the event to all sinks or sources depending on the
+ * event-direction.
+ *
+ * Applications are free to override this behaviour and
+ * implement their own seek handler, but this will work for
+ * pretty much all cases in practice.
+ */
+static gboolean
+gst_bin_send_event (GstElement * element, GstEvent * event)
+{
+ GstBin *bin = GST_BIN (element);
+ GstIterator *iter;
+ gboolean res = TRUE;
+ gboolean done = FALSE;
+
+ if (GST_EVENT_IS_DOWNSTREAM (event)) {
+ iter = gst_bin_iterate_sources (bin);
+ GST_DEBUG_OBJECT (bin, "Sending %s event to src children",
+ GST_EVENT_TYPE_NAME (event));
+ } else {
+ iter = gst_bin_iterate_sinks (bin);
+ GST_DEBUG_OBJECT (bin, "Sending %s event to sink children",
+ GST_EVENT_TYPE_NAME (event));
+ }
+
+ while (!done) {
+ gpointer data;
+
+ switch (gst_iterator_next (iter, &data)) {
+ case GST_ITERATOR_OK:
+ {
+ GstElement *child;
+
+ gst_event_ref (event);
+ child = GST_ELEMENT_CAST (data);
+ res &= gst_element_send_event (child, event);
+ gst_object_unref (child);
+ break;
+ }
+ case GST_ITERATOR_RESYNC:
+ gst_iterator_resync (iter);
+ res = TRUE;
+ break;
+ case GST_ITERATOR_DONE:
+ done = TRUE;
+ break;
+ case GST_ITERATOR_ERROR:
+ g_assert_not_reached ();
+ break;
+ }
+ }
+ gst_iterator_free (iter);
+ gst_event_unref (event);
+
+ return res;
+}
+
+/* this is the function called by the threadpool. When async elements commit
+ * their state, this function will attempt to bring the bin to the next state.
+ */
+static void
+gst_bin_continue_func (BinContinueData * data)
+{
+ GstBin *bin;
+ GstState current, next, pending;
+ GstStateChange transition;
+ GstStateChangeReturn ret;
+
+ bin = data->bin;
+ pending = data->pending;
+
+ GST_DEBUG_OBJECT (bin, "waiting for state lock");
+ GST_STATE_LOCK (bin);
+
+ GST_DEBUG_OBJECT (bin, "doing state continue");
+ GST_OBJECT_LOCK (bin);
+
+ /* if a new state change happened after this thread was scheduled, we return
+ * immediatly. */
+ if (data->cookie != GST_ELEMENT_CAST (bin)->state_cookie)
+ goto interrupted;
+
+ current = GST_STATE (bin);
+ next = GST_STATE_GET_NEXT (current, pending);
+ transition = (GstStateChange) GST_STATE_TRANSITION (current, next);
+
+ GST_STATE_NEXT (bin) = next;
+ /* mark busy */
+ GST_STATE_RETURN (bin) = GST_STATE_CHANGE_ASYNC;
+ GST_OBJECT_UNLOCK (bin);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
+ "continue state change %s to %s, final %s",
+ gst_element_state_get_name (current),
+ gst_element_state_get_name (next), gst_element_state_get_name (pending));
+
+ ret = gst_element_change_state (GST_ELEMENT_CAST (bin), transition);
+
+ GST_STATE_UNLOCK (bin);
+ GST_DEBUG_OBJECT (bin, "state continue done");
+ gst_object_unref (bin);
+ g_free (data);
+ return;
+
+interrupted:
+ {
+ GST_OBJECT_UNLOCK (bin);
+ GST_STATE_UNLOCK (bin);
+ GST_DEBUG_OBJECT (bin, "state continue aborted due to intervening change");
+ gst_object_unref (bin);
+ g_free (data);
+ return;
+ }
+}
+
+static GstBusSyncReply
+bin_bus_handler (GstBus * bus, GstMessage * message, GstBin * bin)
+{
+ GstBinClass *bclass;
+
+ bclass = GST_BIN_GET_CLASS (bin);
+ if (bclass->handle_message)
+ bclass->handle_message (bin, message);
+ else
+ gst_message_unref (message);
+
+ return GST_BUS_DROP;
+}
+
+static void
+bin_push_state_continue (BinContinueData * data)
+{
+ GstBinClass *klass;
+ GstBin *bin;
+
+ /* ref was taken */
+ bin = data->bin;
+ klass = GST_BIN_GET_CLASS (bin);
+
+ GST_DEBUG_OBJECT (bin, "pushing continue on thread pool");
+ g_thread_pool_push (klass->pool, data, NULL);
+}
+
+/* an element started an async state change, if we were not busy with a state
+ * change, we perform a lost state.
+ * This function is called with the OBJECT lock.
+ */
+static void
+bin_handle_async_start (GstBin * bin, gboolean new_base_time)
+{
+ GstState old_state, new_state;
+ gboolean toplevel;
+ GstMessage *amessage = NULL;
+
+ if (GST_STATE_RETURN (bin) == GST_STATE_CHANGE_FAILURE)
+ goto had_error;
+
+ /* get our toplevel state */
+ toplevel = BIN_IS_TOPLEVEL (bin);
+
+ /* prepare an ASYNC_START message, we always post the start message even if we
+ * are busy with a state change or when we are NO_PREROLL. */
+ if (!toplevel)
+ /* non toplevel bin, prepare async-start for the parent */
+ amessage =
+ gst_message_new_async_start (GST_OBJECT_CAST (bin), new_base_time);
+
+ if (bin->polling || GST_STATE_PENDING (bin) != GST_STATE_VOID_PENDING)
+ goto was_busy;
+
+ /* async starts are ignored when we are NO_PREROLL */
+ if (GST_STATE_RETURN (bin) == GST_STATE_CHANGE_NO_PREROLL)
+ goto was_no_preroll;
+
+
+ old_state = GST_STATE (bin);
+
+ /* when we PLAYING we go back to PAUSED, when preroll happens, we go back to
+ * PLAYING after optionally redistributing the base_time. */
+ if (old_state > GST_STATE_PAUSED)
+ new_state = GST_STATE_PAUSED;
+ else
+ new_state = old_state;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin,
+ "lost state of %s, new %s", gst_element_state_get_name (old_state),
+ gst_element_state_get_name (new_state));
+
+ GST_STATE (bin) = new_state;
+ GST_STATE_NEXT (bin) = new_state;
+ GST_STATE_PENDING (bin) = new_state;
+ GST_STATE_RETURN (bin) = GST_STATE_CHANGE_ASYNC;
+ GST_OBJECT_UNLOCK (bin);
+
+ /* post message */
+ gst_element_post_message (GST_ELEMENT_CAST (bin),
+ gst_message_new_state_changed (GST_OBJECT_CAST (bin),
+ new_state, new_state, new_state));
+
+post_start:
+ if (amessage) {
+ /* post our ASYNC_START. */
+ GST_DEBUG_OBJECT (bin, "posting ASYNC_START to parent");
+ gst_element_post_message (GST_ELEMENT_CAST (bin), amessage);
+ }
+ GST_OBJECT_LOCK (bin);
+
+ return;
+
+had_error:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin, "we had an error");
+ return;
+ }
+was_busy:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin, "state change busy");
+ GST_OBJECT_UNLOCK (bin);
+ goto post_start;
+ }
+was_no_preroll:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin, "ignoring, we are NO_PREROLL");
+ GST_OBJECT_UNLOCK (bin);
+ goto post_start;
+ }
+}
+
+/* this function is called when there are no more async elements in the bin. We
+ * post a state changed message and an ASYNC_DONE message.
+ * This function is called with the OBJECT lock.
+ */
+static void
+bin_handle_async_done (GstBin * bin, GstStateChangeReturn ret)
+{
+ GstState current, pending, target;
+ GstStateChangeReturn old_ret;
+ GstState old_state, old_next;
+ gboolean toplevel;
+ GstMessage *smessage = NULL, *amessage = NULL;
+ BinContinueData *cont = NULL;
+
+ if (GST_STATE_RETURN (bin) == GST_STATE_CHANGE_FAILURE)
+ goto had_error;
+
+ pending = GST_STATE_PENDING (bin);
+
+ if (bin->polling)
+ goto was_busy;
+
+ /* check if there is something to commit */
+ if (pending == GST_STATE_VOID_PENDING)
+ goto nothing_pending;
+
+ old_ret = GST_STATE_RETURN (bin);
+ GST_STATE_RETURN (bin) = ret;
+
+ /* move to the next target state */
+ target = GST_STATE_TARGET (bin);
+ pending = GST_STATE_PENDING (bin) = target;
+
+ amessage = gst_message_new_async_done (GST_OBJECT_CAST (bin));
+
+ old_state = GST_STATE (bin);
+ /* this is the state we should go to next */
+ old_next = GST_STATE_NEXT (bin);
+
+ if (old_next != GST_STATE_PLAYING) {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
+ "committing state from %s to %s, old pending %s",
+ gst_element_state_get_name (old_state),
+ gst_element_state_get_name (old_next),
+ gst_element_state_get_name (pending));
+
+ /* update current state */
+ current = GST_STATE (bin) = old_next;
+ } else {
+ current = old_state;
+ }
+
+ /* get our toplevel state */
+ toplevel = BIN_IS_TOPLEVEL (bin);
+
+ /* see if we reached the final state. If we are not toplevel, we also have to
+ * stop here, the parent will continue our state. */
+ if ((pending == current) || !toplevel) {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
+ "completed state change, pending VOID");
+
+ /* mark VOID pending */
+ pending = GST_STATE_VOID_PENDING;
+ GST_STATE_PENDING (bin) = pending;
+ GST_STATE_NEXT (bin) = GST_STATE_VOID_PENDING;
+ } else {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
+ "continue state change, pending %s",
+ gst_element_state_get_name (pending));
+
+ cont = g_new0 (BinContinueData, 1);
+
+ /* ref to the bin */
+ cont->bin = gst_object_ref (bin);
+ /* cookie to detect concurrent state change */
+ cont->cookie = GST_ELEMENT_CAST (bin)->state_cookie;
+ /* pending target state */
+ cont->pending = pending;
+ /* mark busy */
+ GST_STATE_RETURN (bin) = GST_STATE_CHANGE_ASYNC;
+ GST_STATE_NEXT (bin) = pending;
+ }
+
+ if (old_next != GST_STATE_PLAYING) {
+ if (old_state != old_next || old_ret == GST_STATE_CHANGE_ASYNC) {
+ smessage = gst_message_new_state_changed (GST_OBJECT_CAST (bin),
+ old_state, old_next, pending);
+ }
+ }
+ GST_OBJECT_UNLOCK (bin);
+
+ if (smessage) {
+ GST_DEBUG_OBJECT (bin, "posting state change message");
+ gst_element_post_message (GST_ELEMENT_CAST (bin), smessage);
+ }
+ if (amessage) {
+ /* post our combined ASYNC_DONE when all is ASYNC_DONE. */
+ GST_DEBUG_OBJECT (bin, "posting ASYNC_DONE to parent");
+ gst_element_post_message (GST_ELEMENT_CAST (bin), amessage);
+ }
+
+ GST_OBJECT_LOCK (bin);
+ if (cont) {
+ /* toplevel, start continue state */
+ GST_DEBUG_OBJECT (bin, "all async-done, starting state continue");
+ bin_push_state_continue (cont);
+ } else {
+ GST_DEBUG_OBJECT (bin, "state change complete");
+ GST_STATE_BROADCAST (bin);
+ }
+ return;
+
+had_error:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin, "we had an error");
+ return;
+ }
+was_busy:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin, "state change busy");
+ return;
+ }
+nothing_pending:
+ {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin, "nothing pending");
+ return;
+ }
+}
+
+/* handle child messages:
+ *
+ * This method is called synchronously when a child posts a message on
+ * the internal bus.
+ *
+ * GST_MESSAGE_EOS: This message is only posted by sinks
+ * in the PLAYING state. If all sinks posted the EOS message, post
+ * one upwards.
+ *
+ * GST_MESSAGE_STATE_DIRTY: Deprecated
+ *
+ * GST_MESSAGE_SEGMENT_START: just collect, never forward upwards. If an
+ * element posts segment_start twice, only the last message is kept.
+ *
+ * GST_MESSAGE_SEGMENT_DONE: replace SEGMENT_START message from same poster
+ * with the segment_done message. If there are no more segment_start
+ * messages, post segment_done message upwards.
+ *
+ * GST_MESSAGE_DURATION: remove all previously cached duration messages.
+ * Whenever someone performs a duration query on the bin, we store the
+ * result so we can answer it quicker the next time. Any element that
+ * changes its duration marks our cached values invalid.
+ * This message is also posted upwards. This is currently disabled
+ * because too many elements don't post DURATION messages when the
+ * duration changes.
+ *
+ * GST_MESSAGE_CLOCK_LOST: This message is posted by an element when it
+ * can no longer provide a clock. The default bin behaviour is to
+ * check if the lost clock was the one provided by the bin. If so and
+ * we are currently in the PLAYING state, we forward the message to
+ * our parent.
+ * This message is also generated when we remove a clock provider from
+ * a bin. If this message is received by the application, it should
+ * PAUSE the pipeline and set it back to PLAYING to force a new clock
+ * and a new base_time distribution.
+ *
+ * GST_MESSAGE_CLOCK_PROVIDE: This message is generated when an element
+ * can provide a clock. This mostly happens when we add a new clock
+ * provider to the bin. The default behaviour of the bin is to mark the
+ * currently selected clock as dirty, which will perform a clock
+ * recalculation the next time we are asked to provide a clock.
+ * This message is never sent to the application but is forwarded to
+ * the parent.
+ *
+ * GST_MESSAGE_ASYNC_START: Create an internal ELEMENT message that stores
+ * the state of the element and the fact that the element will need a
+ * new base_time. This message is not forwarded to the application.
+ *
+ * GST_MESSAGE_ASYNC_DONE: Find the internal ELEMENT message we kept for the
+ * element when it posted ASYNC_START. If all elements are done, post a
+ * ASYNC_DONE message to the parent.
+ *
+ * OTHER: post upwards.
+ */
+static void
+gst_bin_handle_message_func (GstBin * bin, GstMessage * message)
+{
+ GstObject *src;
+ GstMessageType type;
+
+ src = GST_MESSAGE_SRC (message);
+ type = GST_MESSAGE_TYPE (message);
+
+// Message src can be NULL
+ if(src)
+ GST_DEBUG_OBJECT (bin, "[msg %p] handling child %s message of type %s",
+ message, GST_ELEMENT_NAME (src), GST_MESSAGE_TYPE_NAME (message));
+ else
+ GST_DEBUG_OBJECT (bin, "[msg %p] handling child %s message of type %s",
+ message, "Null ", GST_MESSAGE_TYPE_NAME (message));
+
+ switch (type) {
+ case GST_MESSAGE_EOS:
+ {
+ gboolean eos;
+
+ /* collect all eos messages from the children */
+ GST_OBJECT_LOCK (bin);
+ bin_replace_message (bin, message, GST_MESSAGE_EOS);
+ eos = is_eos (bin);
+ GST_OBJECT_UNLOCK (bin);
+
+ /* if we are completely EOS, we forward an EOS message */
+ if (eos) {
+ GST_DEBUG_OBJECT (bin, "all sinks posted EOS");
+ gst_element_post_message (GST_ELEMENT_CAST (bin),
+ gst_message_new_eos (GST_OBJECT_CAST (bin)));
+ }
+ break;
+ }
+ case GST_MESSAGE_STATE_DIRTY:
+ {
+ GST_WARNING_OBJECT (bin, "received deprecated STATE_DIRTY message");
+
+ /* free message */
+ gst_message_unref (message);
+ break;
+ }
+ case GST_MESSAGE_SEGMENT_START:
+ GST_OBJECT_LOCK (bin);
+ /* replace any previous segment_start message from this source
+ * with the new segment start message */
+ bin_replace_message (bin, message, GST_MESSAGE_SEGMENT_START);
+ GST_OBJECT_UNLOCK (bin);
+ break;
+ case GST_MESSAGE_SEGMENT_DONE:
+ {
+ gboolean post = FALSE;
+ GstFormat format;
+ gint64 position;
+
+ gst_message_parse_segment_done (message, &format, &position);
+
+ GST_OBJECT_LOCK (bin);
+ bin_replace_message (bin, message, GST_MESSAGE_SEGMENT_START);
+ /* if there are no more segment_start messages, everybody posted
+ * a segment_done and we can post one on the bus. */
+
+ /* we don't care who still has a pending segment start */
+ if (!find_message (bin, NULL, GST_MESSAGE_SEGMENT_START)) {
+ /* nothing found */
+ post = TRUE;
+ /* remove all old segment_done messages */
+ bin_remove_messages (bin, NULL, GST_MESSAGE_SEGMENT_DONE);
+ }
+ GST_OBJECT_UNLOCK (bin);
+ if (post) {
+ /* post segment done with latest format and position. */
+ gst_element_post_message (GST_ELEMENT_CAST (bin),
+ gst_message_new_segment_done (GST_OBJECT_CAST (bin),
+ format, position));
+ }
+ break;
+ }
+ case GST_MESSAGE_DURATION:
+ {
+ /* remove all cached duration messages, next time somebody asks
+ * for duration, we will recalculate. */
+ GST_OBJECT_LOCK (bin);
+ bin_remove_messages (bin, NULL, GST_MESSAGE_DURATION);
+ GST_OBJECT_UNLOCK (bin);
+ goto forward;
+ }
+ case GST_MESSAGE_CLOCK_LOST:
+ {
+ GstClock **provided_clock_p;
+ GstElement **clock_provider_p;
+ gboolean playing, provided, forward;
+ GstClock *clock;
+
+ gst_message_parse_clock_lost (message, &clock);
+
+ GST_OBJECT_LOCK (bin);
+ bin->clock_dirty = TRUE;
+ /* if we lost the clock that we provided, post to parent but
+ * only if we are PLAYING. */
+ provided = (clock == bin->provided_clock);
+ playing = (GST_STATE (bin) == GST_STATE_PLAYING);
+ forward = playing & provided;
+ if (provided) {
+ GST_DEBUG_OBJECT (bin,
+ "Lost clock %" GST_PTR_FORMAT " provided by %" GST_PTR_FORMAT,
+ bin->provided_clock, bin->clock_provider);
+ provided_clock_p = &bin->provided_clock;
+ clock_provider_p = &bin->clock_provider;
+ gst_object_replace ((GstObject **) provided_clock_p, NULL);
+ gst_object_replace ((GstObject **) clock_provider_p, NULL);
+ }
+ GST_DEBUG_OBJECT (bin, "provided %d, playing %d, forward %d",
+ provided, playing, forward);
+ GST_OBJECT_UNLOCK (bin);
+
+ if (forward)
+ goto forward;
+
+ /* free message */
+ gst_message_unref (message);
+ break;
+ }
+ case GST_MESSAGE_CLOCK_PROVIDE:
+ {
+ gboolean forward;
+
+ GST_OBJECT_LOCK (bin);
+ bin->clock_dirty = TRUE;
+ /* a new clock is available, post to parent but not
+ * to the application */
+ forward = GST_OBJECT_PARENT (bin) != NULL;
+ GST_OBJECT_UNLOCK (bin);
+
+ if (forward)
+ goto forward;
+
+ /* free message */
+ gst_message_unref (message);
+ break;
+ }
+ case GST_MESSAGE_ASYNC_START:
+ {
+ gboolean new_base_time;
+ GstState target;
+ if(src)
+ GST_DEBUG_OBJECT (bin, "ASYNC_START message %p, %s", message,
+ GST_OBJECT_NAME (src));
+ else
+ GST_DEBUG_OBJECT (bin, "ASYNC_START message %p, %s", message,
+ "Null Source");
+
+ gst_message_parse_async_start (message, &new_base_time);
+
+ GST_OBJECT_LOCK (bin);
+ /* we ignore the message if we are going to <= READY */
+ target = GST_STATE_TARGET (bin);
+ if (target <= GST_STATE_READY)
+ goto ignore_start_message;
+
+ /* takes ownership of the message */
+ bin_replace_message (bin, message, GST_MESSAGE_ASYNC_START);
+
+ bin_handle_async_start (bin, new_base_time);
+ GST_OBJECT_UNLOCK (bin);
+ break;
+
+ ignore_start_message:
+ {
+ GST_DEBUG_OBJECT (bin, "ignoring message, target %s",
+ gst_element_state_get_name (target));
+ GST_OBJECT_UNLOCK (bin);
+ gst_message_unref (message);
+ break;
+ }
+ }
+ case GST_MESSAGE_ASYNC_DONE:
+ {
+ GstState target;
+
+ if(src)
+ GST_DEBUG_OBJECT (bin, "ASYNC_DONE message %p, %s", message,
+ GST_OBJECT_NAME (src));
+ else
+ GST_DEBUG_OBJECT (bin, "ASYNC_DONE message %p, %s", message,
+ "Null Source");
+
+ GST_OBJECT_LOCK (bin);
+ target = GST_STATE_TARGET (bin);
+ /* ignore messages if we are shutting down */
+ if (target <= GST_STATE_READY)
+ goto ignore_done_message;
+
+ bin_replace_message (bin, message, GST_MESSAGE_ASYNC_START);
+ /* if there are no more ASYNC_START messages, everybody posted
+ * a ASYNC_DONE and we can post one on the bus. When checking, we
+ * don't care who still has a pending ASYNC_START */
+ if (!find_message (bin, NULL, GST_MESSAGE_ASYNC_START)) {
+ /* nothing found, remove all old ASYNC_DONE messages */
+ bin_remove_messages (bin, NULL, GST_MESSAGE_ASYNC_DONE);
+
+ GST_DEBUG_OBJECT (bin, "async elements commited");
+ bin_handle_async_done (bin, GST_STATE_CHANGE_SUCCESS);
+ }
+ GST_OBJECT_UNLOCK (bin);
+ break;
+
+ ignore_done_message:
+ {
+ GST_DEBUG_OBJECT (bin, "ignoring message, target %s",
+ gst_element_state_get_name (target));
+ GST_OBJECT_UNLOCK (bin);
+ gst_message_unref (message);
+ break;
+ }
+ }
+ default:
+ goto forward;
+ }
+ return;
+
+forward:
+ {
+ /* Send all other messages upward */
+ GST_DEBUG_OBJECT (bin, "posting message upward");
+ gst_element_post_message (GST_ELEMENT_CAST (bin), message);
+ return;
+ }
+}
+
+/* generic struct passed to all query fold methods */
+typedef struct
+{
+ GstQuery *query;
+ gint64 min;
+ gint64 max;
+ gboolean live;
+} QueryFold;
+
+typedef void (*QueryInitFunction) (GstBin * bin, QueryFold * fold);
+typedef void (*QueryDoneFunction) (GstBin * bin, QueryFold * fold);
+
+/* for duration/position we collect all durations/positions and take
+ * the MAX of all valid results */
+static void
+bin_query_min_max_init (GstBin * bin, QueryFold * fold)
+{
+ fold->min = 0;
+ fold->max = -1;
+ fold->live = FALSE;
+}
+
+static gboolean
+bin_query_duration_fold (GstElement * item, GValue * ret, QueryFold * fold)
+{
+ if (gst_element_query (item, fold->query)) {
+ gint64 duration;
+
+ g_value_set_boolean (ret, TRUE);
+
+ gst_query_parse_duration (fold->query, NULL, &duration);
+
+ GST_DEBUG_OBJECT (item, "got duration %" G_GINT64_FORMAT, duration);
+
+ if (duration > fold->max)
+ fold->max = duration;
+ }
+
+ gst_object_unref (item);
+ return TRUE;
+}
+static void
+bin_query_duration_done (GstBin * bin, QueryFold * fold)
+{
+ GstFormat format;
+
+ gst_query_parse_duration (fold->query, &format, NULL);
+ /* store max in query result */
+ gst_query_set_duration (fold->query, format, fold->max);
+
+ GST_DEBUG_OBJECT (bin, "max duration %" G_GINT64_FORMAT, fold->max);
+
+#ifdef DURATION_CACHING
+ /* and cache now */
+ GST_OBJECT_LOCK (bin);
+ bin->messages = g_list_prepend (bin->messages,
+ gst_message_new_duration (GST_OBJECT_CAST (bin), format, fold->max));
+ GST_OBJECT_UNLOCK (bin);
+#endif
+}
+
+static gboolean
+bin_query_position_fold (GstElement * item, GValue * ret, QueryFold * fold)
+{
+ if (gst_element_query (item, fold->query)) {
+ gint64 position;
+
+ g_value_set_boolean (ret, TRUE);
+
+ gst_query_parse_position (fold->query, NULL, &position);
+
+ GST_DEBUG_OBJECT (item, "got position %" G_GINT64_FORMAT, position);
+
+ if (position > fold->max)
+ fold->max = position;
+ }
+
+ gst_object_unref (item);
+ return TRUE;
+}
+static void
+bin_query_position_done (GstBin * bin, QueryFold * fold)
+{
+ GstFormat format;
+
+ gst_query_parse_position (fold->query, &format, NULL);
+ /* store max in query result */
+ gst_query_set_position (fold->query, format, fold->max);
+
+ GST_DEBUG_OBJECT (bin, "max position %" G_GINT64_FORMAT, fold->max);
+}
+
+static gboolean
+bin_query_latency_fold (GstElement * item, GValue * ret, QueryFold * fold)
+{
+ if (gst_element_query (item, fold->query)) {
+ GstClockTime min, max;
+ gboolean live;
+
+ gst_query_parse_latency (fold->query, &live, &min, &max);
+
+ GST_DEBUG_OBJECT (item,
+ "got latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
+ ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
+
+ /* for the combined latency we collect the MAX of all min latencies and
+ * the MIN of all max latencies */
+ if (min > fold->min)
+ fold->min = min;
+ if (fold->max == -1)
+ fold->max = max;
+ else if (max < fold->max)
+ fold->max = max;
+ if (fold->live == FALSE)
+ fold->live = live;
+ } else {
+ g_value_set_boolean (ret, FALSE);
+ GST_DEBUG_OBJECT (item, "failed query");
+ }
+
+ gst_object_unref (item);
+ return TRUE;
+}
+
+static void
+bin_query_latency_done (GstBin * bin, QueryFold * fold)
+{
+ /* store max in query result */
+ gst_query_set_latency (fold->query, fold->live, fold->min, fold->max);
+
+ GST_DEBUG_OBJECT (bin,
+ "latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
+ ", live %d", GST_TIME_ARGS (fold->min), GST_TIME_ARGS (fold->max),
+ fold->live);
+}
+
+/* generic fold, return first valid result */
+static gboolean
+bin_query_generic_fold (GstElement * item, GValue * ret, QueryFold * fold)
+{
+ gboolean res;
+
+ if ((res = gst_element_query (item, fold->query))) {
+ g_value_set_boolean (ret, TRUE);
+ GST_DEBUG_OBJECT (item, "answered query %p", fold->query);
+ }
+
+ gst_object_unref (item);
+
+ /* and stop as soon as we have a valid result */
+ return !res;
+}
+
+static gboolean
+gst_bin_query (GstElement * element, GstQuery * query)
+{
+ GstBin *bin = GST_BIN (element);
+ GstIterator *iter;
+ gboolean res = FALSE;
+ GstIteratorFoldFunction fold_func;
+ QueryInitFunction fold_init = NULL;
+ QueryDoneFunction fold_done = NULL;
+ QueryFold fold_data;
+ GValue ret = { 0 };
+
+ switch (GST_QUERY_TYPE (query)) {
+ case GST_QUERY_DURATION:
+ {
+#ifdef DURATION_CACHING
+ GList *cached;
+ GstFormat qformat;
+
+ gst_query_parse_duration (query, &qformat, NULL);
+
+ /* find cached duration query */
+ GST_OBJECT_LOCK (bin);
+ for (cached = bin->messages; cached; cached = g_list_next (cached)) {
+ GstMessage *message = (GstMessage *) cached->data;
+
+ if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_DURATION &&
+ GST_MESSAGE_SRC (message) == GST_OBJECT_CAST (bin)) {
+ GstFormat format;
+ gint64 duration;
+
+ gst_message_parse_duration (message, &format, &duration);
+
+ /* if cached same format, copy duration in query result */
+ if (format == qformat) {
+ GST_DEBUG_OBJECT (bin, "return cached duration %" G_GINT64_FORMAT,
+ duration);
+ GST_OBJECT_UNLOCK (bin);
+
+ gst_query_set_duration (query, qformat, duration);
+ res = TRUE;
+ goto exit;
+ }
+ }
+ }
+ GST_OBJECT_UNLOCK (bin);
+#endif
+ /* no cached value found, iterate and collect durations */
+ fold_func = (GstIteratorFoldFunction) bin_query_duration_fold;
+ fold_init = bin_query_min_max_init;
+ fold_done = bin_query_duration_done;
+ break;
+ }
+ case GST_QUERY_POSITION:
+ {
+ fold_func = (GstIteratorFoldFunction) bin_query_position_fold;
+ fold_init = bin_query_min_max_init;
+ fold_done = bin_query_position_done;
+ break;
+ }
+ case GST_QUERY_LATENCY:
+ {
+ fold_func = (GstIteratorFoldFunction) bin_query_latency_fold;
+ fold_init = bin_query_min_max_init;
+ fold_done = bin_query_latency_done;
+ res = TRUE;
+ break;
+ }
+ default:
+ fold_func = (GstIteratorFoldFunction) bin_query_generic_fold;
+ break;
+ }
+
+ fold_data.query = query;
+
+ g_value_init (&ret, G_TYPE_BOOLEAN);
+ g_value_set_boolean (&ret, res);
+
+ iter = gst_bin_iterate_sinks (bin);
+ GST_DEBUG_OBJECT (bin, "Sending query %p (type %s) to sink children",
+ query, GST_QUERY_TYPE_NAME (query));
+
+ if (fold_init)
+ fold_init (bin, &fold_data);
+
+ while (TRUE) {
+ GstIteratorResult ires;
+
+ ires = gst_iterator_fold (iter, fold_func, &ret, &fold_data);
+
+ switch (ires) {
+ case GST_ITERATOR_RESYNC:
+ gst_iterator_resync (iter);
+ if (fold_init)
+ fold_init (bin, &fold_data);
+ g_value_set_boolean (&ret, res);
+ break;
+ case GST_ITERATOR_OK:
+ case GST_ITERATOR_DONE:
+ res = g_value_get_boolean (&ret);
+ if (fold_done != NULL && res)
+ fold_done (bin, &fold_data);
+ goto done;
+ default:
+ res = FALSE;
+ goto done;
+ }
+ }
+done:
+ gst_iterator_free (iter);
+
+#ifdef DURATION_CACHING
+exit:
+#endif
+ GST_DEBUG_OBJECT (bin, "query %p result %d", query, res);
+
+ return res;
+}
+
+static gint
+compare_name (GstElement * element, const gchar * name)
+{
+ gint eq;
+
+ GST_OBJECT_LOCK (element);
+ eq = strcmp (GST_ELEMENT_NAME (element), name);
+ GST_OBJECT_UNLOCK (element);
+
+ if (eq != 0) {
+ gst_object_unref (element);
+ }
+ return eq;
+}
+
+/**
+ * gst_bin_get_by_name:
+ * @bin: a #GstBin
+ * @name: the element name to search for
+ *
+ * Gets the element with the given name from a bin. This
+ * function recurses into child bins.
+ *
+ * Returns NULL if no element with the given name is found in the bin.
+ *
+ * MT safe. Caller owns returned reference.
+ *
+ * Returns: the #GstElement with the given name, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElement *
+gst_bin_get_by_name (GstBin * bin, const gchar * name)
+{
+ GstIterator *children;
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+
+ GST_CAT_INFO (GST_CAT_PARENTAGE, "[%s]: looking up child element %s",
+ GST_ELEMENT_NAME (bin), name);
+
+ children = gst_bin_iterate_recurse (bin);
+ result = gst_iterator_find_custom (children,
+ (GCompareFunc) compare_name, (gpointer) name);
+ gst_iterator_free (children);
+
+ return GST_ELEMENT_CAST (result);
+}
+
+/**
+ * gst_bin_get_by_name_recurse_up:
+ * @bin: a #GstBin
+ * @name: the element name to search for
+ *
+ * Gets the element with the given name from this bin. If the
+ * element is not found, a recursion is performed on the parent bin.
+ *
+ * Returns NULL if:
+ * - no element with the given name is found in the bin
+ *
+ * MT safe. Caller owns returned reference.
+ *
+ * Returns: the #GstElement with the given name, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElement *
+gst_bin_get_by_name_recurse_up (GstBin * bin, const gchar * name)
+{
+ GstElement *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+ g_return_val_if_fail (name != NULL, NULL);
+
+ result = gst_bin_get_by_name (bin, name);
+
+ if (!result) {
+ GstObject *parent;
+
+ parent = gst_object_get_parent (GST_OBJECT_CAST (bin));
+ if (parent) {
+ if (GST_IS_BIN (parent)) {
+ result = gst_bin_get_by_name_recurse_up (GST_BIN_CAST (parent), name);
+ }
+ gst_object_unref (parent);
+ }
+ }
+
+ return result;
+}
+
+static gint
+compare_interface (GstElement * element, gpointer interface)
+{
+ GType interface_type = (GType) interface;
+ gint ret;
+
+ if (G_TYPE_CHECK_INSTANCE_TYPE (element, interface_type)) {
+ ret = 0;
+ } else {
+ /* we did not find the element, need to release the ref
+ * added by the iterator */
+ gst_object_unref (element);
+ ret = 1;
+ }
+ return ret;
+}
+
+/**
+ * gst_bin_get_by_interface:
+ * @bin: a #GstBin
+ * @iface: the #GType of an interface
+ *
+ * Looks for an element inside the bin that implements the given
+ * interface. If such an element is found, it returns the element.
+ * You can cast this element to the given interface afterwards. If you want
+ * all elements that implement the interface, use
+ * gst_bin_iterate_all_by_interface(). This function recurses into child bins.
+ *
+ * MT safe. Caller owns returned reference.
+ *
+ * Returns: A #GstElement inside the bin implementing the interface
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElement *
+gst_bin_get_by_interface (GstBin * bin, GType iface)
+{
+ GstIterator *children;
+ gpointer result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+ g_return_val_if_fail (G_TYPE_IS_INTERFACE (iface), NULL);
+
+ children = gst_bin_iterate_recurse (bin);
+ result = gst_iterator_find_custom (children, (GCompareFunc) compare_interface,
+ (gpointer) iface);
+ gst_iterator_free (children);
+
+ return GST_ELEMENT_CAST (result);
+}
+
+/**
+ * gst_bin_iterate_all_by_interface:
+ * @bin: a #GstBin
+ * @iface: the #GType of an interface
+ *
+ * Looks for all elements inside the bin that implements the given
+ * interface. You can safely cast all returned elements to the given interface.
+ * The function recurses inside child bins. The iterator will yield a series
+ * of #GstElement that should be unreffed after use.
+ *
+ * Each element yielded by the iterator will have its refcount increased, so
+ * unref after use.
+ *
+ * MT safe. Caller owns returned value.
+ *
+ * Returns: a #GstIterator of #GstElement for all elements in the bin
+ * implementing the given interface, or NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_bin_iterate_all_by_interface (GstBin * bin, GType iface)
+{
+ GstIterator *children;
+ GstIterator *result;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+ g_return_val_if_fail (G_TYPE_IS_INTERFACE (iface), NULL);
+
+ children = gst_bin_iterate_recurse (bin);
+ result = gst_iterator_filter (children, (GCompareFunc) compare_interface,
+ (gpointer) iface);
+
+ return result;
+}
+
+#ifndef GST_DISABLE_LOADSAVE
+static xmlNodePtr
+gst_bin_save_thyself (GstObject * object, xmlNodePtr parent)
+{
+ GstBin *bin = GST_BIN (object);
+ xmlNodePtr childlist, elementnode;
+ GList *children;
+ GstElement *child;
+
+ if (GST_OBJECT_CLASS (parent_class)->save_thyself)
+ GST_OBJECT_CLASS (parent_class)->save_thyself (GST_OBJECT (bin), parent);
+
+ childlist = xmlNewChild (parent, NULL, (xmlChar *) "children", NULL);
+
+ GST_CAT_INFO (GST_CAT_XML, "[%s]: saving %d children",
+ GST_ELEMENT_NAME (bin), bin->numchildren);
+
+ children = bin->children;
+ while (children) {
+ child = GST_ELEMENT (children->data);
+ elementnode = xmlNewChild (childlist, NULL, (xmlChar *) "element", NULL);
+ gst_object_save_thyself (GST_OBJECT (child), elementnode);
+ children = g_list_next (children);
+ }
+ return childlist;
+}
+
+static void
+gst_bin_restore_thyself (GstObject * object, xmlNodePtr self)
+{
+ GstBin *bin = GST_BIN (object);
+ xmlNodePtr field = self->xmlChildrenNode;
+ xmlNodePtr childlist;
+
+ while (field) {
+ if (!strcmp ((char *) field->name, "children")) {
+ GST_CAT_INFO (GST_CAT_XML, "[%s]: loading children",
+ GST_ELEMENT_NAME (object));
+ childlist = field->xmlChildrenNode;
+ while (childlist) {
+ if (!strcmp ((char *) childlist->name, "element")) {
+ /* gst_xml_make_element will gst_bin_add() the element to ourself */
+ gst_xml_make_element (childlist, GST_OBJECT (bin));
+ }
+ childlist = childlist->next;
+ }
+ }
+
+ field = field->next;
+ }
+ if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
+ (GST_OBJECT_CLASS (parent_class)->restore_thyself) (object, self);
+}
+#endif /* GST_DISABLE_LOADSAVE */