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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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3888 lines
116 KiB
C
3888 lines
116 KiB
C
/* GStreamer
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*
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2004 Wim Taymans <wim.taymans@gmail.com>
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*
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* gstbin.c: GstBin container object and support code
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* MT safe.
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*/
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/**
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* SECTION:gstbin
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* @short_description: Base class and element that can contain other elements
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*
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* #GstBin is an element that can contain other #GstElement, allowing them to be
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* managed as a group.
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* Pads from the child elements can be ghosted to the bin, see #GstGhostPad.
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* This makes the bin look like any other elements and enables creation of
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* higher-level abstraction elements.
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*
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* A new #GstBin is created with gst_bin_new(). Use a #GstPipeline instead if you
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* want to create a toplevel bin because a normal bin doesn't have a bus or
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* handle clock distribution of its own.
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*
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* After the bin has been created you will typically add elements to it with
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* gst_bin_add(). You can remove elements with gst_bin_remove().
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*
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* An element can be retrieved from a bin with gst_bin_get_by_name(), using the
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* elements name. gst_bin_get_by_name_recurse_up() is mainly used for internal
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* purposes and will query the parent bins when the element is not found in the
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* current bin.
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*
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* An iterator of elements in a bin can be retrieved with
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* gst_bin_iterate_elements(). Various other iterators exist to retrieve the
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* elements in a bin.
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*
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* gst_object_unref() is used to drop your reference to the bin.
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*
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* The #GstBin::element-added signal is fired whenever a new element is added to
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* the bin. Likewise the #GstBin::element-removed signal is fired whenever an
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* element is removed from the bin.
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*
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* <refsect2><title>Notes</title>
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* <para>
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* A #GstBin internally intercepts every #GstMessage posted by its children and
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* implements the following default behaviour for each of them:
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* <variablelist>
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* <varlistentry>
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* <term>GST_MESSAGE_EOS</term>
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* <listitem><para>This message is only posted by sinks in the PLAYING
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* state. If all sinks posted the EOS message, this bin will post and EOS
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* message upwards.</para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>GST_MESSAGE_SEGMENT_START</term>
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* <listitem><para>just collected and never forwarded upwards.
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* The messages are used to decide when all elements have completed playback
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* of their segment.</para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>GST_MESSAGE_SEGMENT_DONE</term>
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* <listitem><para> Is posted by #GstBin when all elements that posted
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* a SEGMENT_START have posted a SEGMENT_DONE.</para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>GST_MESSAGE_DURATION</term>
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* <listitem><para> Is posted by an element that detected a change
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* in the stream duration. The default bin behaviour is to clear any
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* cached duration values so that the next duration query will perform
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* a full duration recalculation. The duration change is posted to the
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* application so that it can refetch the new duration with a duration
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* query. Note that these messages can be posted before the bin is
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* prerolled, in which case the duration query might fail.
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* </para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>GST_MESSAGE_CLOCK_LOST</term>
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* <listitem><para> This message is posted by an element when it
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* can no longer provide a clock. The default bin behaviour is to
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* check if the lost clock was the one provided by the bin. If so and
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* the bin is currently in the PLAYING state, the message is forwarded to
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* the bin parent.
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* This message is also generated when a clock provider is removed from
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* the bin. If this message is received by the application, it should
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* PAUSE the pipeline and set it back to PLAYING to force a new clock
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* distribution.
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* </para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>GST_MESSAGE_CLOCK_PROVIDE</term>
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* <listitem><para> This message is generated when an element
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* can provide a clock. This mostly happens when a new clock
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* provider is added to the bin. The default behaviour of the bin is to
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* mark the currently selected clock as dirty, which will perform a clock
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* recalculation the next time the bin is asked to provide a clock.
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* This message is never sent tot the application but is forwarded to
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* the parent of the bin.
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* </para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>OTHERS</term>
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* <listitem><para> posted upwards.</para></listitem>
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* </varlistentry>
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* </variablelist>
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*
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*
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* A #GstBin implements the following default behaviour for answering to a
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* #GstQuery:
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* <variablelist>
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* <varlistentry>
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* <term>GST_QUERY_DURATION</term>
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* <listitem><para>If the query has been asked before with the same format
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* and the bin is a toplevel bin (ie. has no parent),
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* use the cached previous value. If no previous value was cached, the
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* query is sent to all sink elements in the bin and the MAXIMUM of all
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* values is returned. If the bin is a toplevel bin the value is cached.
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* If no sinks are available in the bin, the query fails.
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* </para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>GST_QUERY_POSITION</term>
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* <listitem><para>The query is sent to all sink elements in the bin and the
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* MAXIMUM of all values is returned. If no sinks are available in the bin,
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* the query fails.
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* </para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term>OTHERS</term>
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* <listitem><para>the query is forwarded to all sink elements, the result
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* of the first sink that answers the query successfully is returned. If no
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* sink is in the bin, the query fails.</para></listitem>
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* </varlistentry>
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* </variablelist>
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*
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* A #GstBin will by default forward any event sent to it to all sink elements.
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* If all the sinks return TRUE, the bin will also return TRUE, else FALSE is
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* returned. If no sinks are in the bin, the event handler will return TRUE.
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*
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* </para>
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* </refsect2>
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*
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* Last reviewed on 2006-04-28 (0.10.6)
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*/
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#include "gst_private.h"
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#include "gstevent.h"
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#include "gstbin.h"
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#include "gstmarshal.h"
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#include "gstxml.h"
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#include "gstinfo.h"
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#include "gsterror.h"
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#include "gstindex.h"
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#include "gstindexfactory.h"
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#include "gstutils.h"
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#include "gstchildproxy.h"
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#ifdef GST_DISABLE_DEPRECATED
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#if !defined(GST_DISABLE_LOADSAVE) && !defined(GST_REMOVE_DEPRECATED)
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#undef GstXmlNodePtr
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#define GstXmlNodePtr xmlNodePtr
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#include <libxml/parser.h>
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GstXmlNodePtr gst_object_save_thyself (GstObject * object,
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GstXmlNodePtr parent);
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void gst_object_restore_thyself (GstObject * object, GstXmlNodePtr parent);
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GstElement *gst_xml_make_element (xmlNodePtr cur, GstObject * parent);
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#endif
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#endif
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/* enable for DURATION caching.
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* FIXME currently too many elements don't update
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* their duration when it changes so we return inaccurate values. */
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#undef DURATION_CACHING
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/* latency is by default enabled now.
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* live-preroll and no-live-preroll in the environment var GST_COMPAT
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* to enables or disable it respectively.
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*/
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static gboolean enable_latency = TRUE;
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GST_DEBUG_CATEGORY_STATIC (bin_debug);
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#define GST_CAT_DEFAULT bin_debug
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/* a bin is toplevel if it has no parent or when it is configured to behave like
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* a toplevel bin */
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#define BIN_IS_TOPLEVEL(bin) ((GST_OBJECT_PARENT (bin) == NULL) || bin->priv->asynchandling)
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#define GST_BIN_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BIN, GstBinPrivate))
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struct _GstBinPrivate
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{
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gboolean asynchandling;
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/* if we get an ASYNC_DONE message from ourselves, this means that the
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* subclass will simulate ASYNC behaviour without having ASYNC children. When
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* such an ASYNC_DONE message is posted while we are doing a state change, we
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* have to process the message after finishing the state change even when no
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* child returned GST_STATE_CHANGE_ASYNC. */
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gboolean pending_async_done;
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guint32 structure_cookie;
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/* cached index */
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GstIndex *index;
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/* forward messages from our children */
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gboolean message_forward;
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};
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typedef struct
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{
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GstBin *bin;
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guint32 cookie;
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GstState pending;
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} BinContinueData;
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static void gst_bin_dispose (GObject * object);
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static void gst_bin_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_bin_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn gst_bin_change_state_func (GstElement * element,
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GstStateChange transition);
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static GstStateChangeReturn gst_bin_get_state_func (GstElement * element,
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GstState * state, GstState * pending, GstClockTime timeout);
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static void bin_handle_async_done (GstBin * bin, GstStateChangeReturn ret,
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gboolean flag_pending);
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static void bin_handle_async_start (GstBin * bin, gboolean new_base_time);
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static void bin_push_state_continue (BinContinueData * data);
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static gboolean gst_bin_add_func (GstBin * bin, GstElement * element);
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static gboolean gst_bin_remove_func (GstBin * bin, GstElement * element);
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static void gst_bin_set_index_func (GstElement * element, GstIndex * index);
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static GstIndex *gst_bin_get_index_func (GstElement * element);
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static GstClock *gst_bin_provide_clock_func (GstElement * element);
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static gboolean gst_bin_set_clock_func (GstElement * element, GstClock * clock);
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static void gst_bin_handle_message_func (GstBin * bin, GstMessage * message);
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static gboolean gst_bin_send_event (GstElement * element, GstEvent * event);
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static GstBusSyncReply bin_bus_handler (GstBus * bus,
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GstMessage * message, GstBin * bin);
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static gboolean gst_bin_query (GstElement * element, GstQuery * query);
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static gboolean gst_bin_do_latency_func (GstBin * bin);
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#if !defined(GST_DISABLE_LOADSAVE) && !defined(GST_REMOVE_DEPRECATED)
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static xmlNodePtr gst_bin_save_thyself (GstObject * object, xmlNodePtr parent);
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static void gst_bin_restore_thyself (GstObject * object, xmlNodePtr self);
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#endif
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static void bin_remove_messages (GstBin * bin, GstObject * src,
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GstMessageType types);
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static void gst_bin_continue_func (BinContinueData * data);
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static gint bin_element_is_sink (GstElement * child, GstBin * bin);
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static gint bin_element_is_src (GstElement * child, GstBin * bin);
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static GstIterator *gst_bin_sort_iterator_new (GstBin * bin);
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/* Bin signals and properties */
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enum
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{
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ELEMENT_ADDED,
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ELEMENT_REMOVED,
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DO_LATENCY,
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LAST_SIGNAL
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};
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#define DEFAULT_ASYNC_HANDLING FALSE
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#define DEFAULT_MESSAGE_FORWARD FALSE
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enum
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{
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PROP_0,
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PROP_ASYNC_HANDLING,
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PROP_MESSAGE_FORWARD,
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PROP_LAST
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};
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static void gst_bin_child_proxy_init (gpointer g_iface, gpointer iface_data);
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static guint gst_bin_signals[LAST_SIGNAL] = { 0 };
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#define _do_init(type) \
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{ \
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const gchar *compat; \
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static const GInterfaceInfo iface_info = { \
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gst_bin_child_proxy_init, \
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NULL, \
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NULL}; \
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\
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g_type_add_interface_static (type, GST_TYPE_CHILD_PROXY, &iface_info); \
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\
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GST_DEBUG_CATEGORY_INIT (bin_debug, "bin", GST_DEBUG_BOLD, \
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"debugging info for the 'bin' container element"); \
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\
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/* compatibility stuff */ \
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compat = g_getenv ("GST_COMPAT"); \
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if (compat != NULL) { \
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if (strstr (compat, "no-live-preroll")) \
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enable_latency = FALSE; \
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else if (strstr (compat, "live-preroll")) \
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enable_latency = TRUE; \
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} \
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}
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GST_BOILERPLATE_FULL (GstBin, gst_bin, GstElement, GST_TYPE_ELEMENT, _do_init);
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static void
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gst_bin_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (gstelement_class, "Generic bin",
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"Generic/Bin",
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"Simple container object",
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"Erik Walthinsen <omega@cse.ogi.edu>,"
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"Wim Taymans <wim.taymans@gmail.com>");
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}
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static GstObject *
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gst_bin_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
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guint index)
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{
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GstObject *res;
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GstBin *bin;
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bin = GST_BIN_CAST (child_proxy);
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GST_OBJECT_LOCK (bin);
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if ((res = g_list_nth_data (bin->children, index)))
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gst_object_ref (res);
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GST_OBJECT_UNLOCK (bin);
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return res;
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}
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static guint
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gst_bin_child_proxy_get_children_count (GstChildProxy * child_proxy)
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{
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guint num;
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GstBin *bin;
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bin = GST_BIN_CAST (child_proxy);
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GST_OBJECT_LOCK (bin);
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num = bin->numchildren;
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GST_OBJECT_UNLOCK (bin);
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return num;
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}
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static void
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gst_bin_child_proxy_init (gpointer g_iface, gpointer iface_data)
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{
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GstChildProxyInterface *iface = g_iface;
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iface->get_children_count = gst_bin_child_proxy_get_children_count;
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iface->get_child_by_index = gst_bin_child_proxy_get_child_by_index;
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}
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static gboolean
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_gst_boolean_accumulator (GSignalInvocationHint * ihint,
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GValue * return_accu, const GValue * handler_return, gpointer dummy)
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{
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gboolean myboolean;
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myboolean = g_value_get_boolean (handler_return);
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if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
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g_value_set_boolean (return_accu, myboolean);
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GST_DEBUG ("invocation %d, %d", ihint->run_type, myboolean);
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/* stop emission */
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return FALSE;
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}
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static void
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gst_bin_class_init (GstBinClass * klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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GstElementClass *gstelement_class;
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GError *err;
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gobject_class = (GObjectClass *) klass;
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gstobject_class = (GstObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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g_type_class_add_private (klass, sizeof (GstBinPrivate));
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gobject_class->set_property = gst_bin_set_property;
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gobject_class->get_property = gst_bin_get_property;
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/**
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* GstBin:async-handling
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*
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* If set to #TRUE, the bin will handle asynchronous state changes.
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* This should be used only if the bin subclass is modifying the state
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* of its children on its own.
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*
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* Since: 0.10.13
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*/
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g_object_class_install_property (gobject_class, PROP_ASYNC_HANDLING,
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g_param_spec_boolean ("async-handling", "Async Handling",
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"The bin will handle Asynchronous state changes",
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DEFAULT_ASYNC_HANDLING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstBin::element-added:
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* @bin: the #GstBin
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* @element: the #GstElement that was added to the bin
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*
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* Will be emitted after the element was added to the bin.
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*/
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gst_bin_signals[ELEMENT_ADDED] =
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g_signal_new ("element-added", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstBinClass, element_added), NULL,
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NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_ELEMENT);
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/**
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* GstBin::element-removed:
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* @bin: the #GstBin
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* @element: the #GstElement that was removed from the bin
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*
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* Will be emitted after the element was removed from the bin.
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*/
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gst_bin_signals[ELEMENT_REMOVED] =
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g_signal_new ("element-removed", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstBinClass, element_removed), NULL,
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NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_ELEMENT);
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/**
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* GstBin::do-latency:
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* @bin: the #GstBin
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*
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* Will be emitted when the bin needs to perform latency calculations. This
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* signal is only emited for toplevel bins or when async-handling is
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* enabled.
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*
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* Only one signal handler is invoked. If no signals are connected, the
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* default handler is invoked, which will query and distribute the lowest
|
|
* possible latency to all sinks.
|
|
*
|
|
* Connect to this signal if the default latency calculations are not
|
|
* sufficient, like when you need different latencies for different sinks in
|
|
* the same pipeline.
|
|
*
|
|
* Since: 0.10.22
|
|
*/
|
|
gst_bin_signals[DO_LATENCY] =
|
|
g_signal_new ("do-latency", G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstBinClass, do_latency),
|
|
_gst_boolean_accumulator, NULL, gst_marshal_BOOLEAN__VOID,
|
|
G_TYPE_BOOLEAN, 0, G_TYPE_NONE);
|
|
|
|
/**
|
|
* GstBin:message-forward
|
|
*
|
|
* Forward all children messages, even those that would normally be filtered by
|
|
* the bin. This can be interesting when one wants to be notified of the EOS
|
|
* state of individual elements, for example.
|
|
*
|
|
* The messages are converted to an ELEMENT message with the bin as the
|
|
* source. The structure of the message is named 'GstBinForwarded' and contains
|
|
* a field named 'message' of type GST_TYPE_MESSAGE that contains the original
|
|
* forwarded message.
|
|
*
|
|
* Since: 0.10.31
|
|
*/
|
|
g_object_class_install_property (gobject_class, PROP_MESSAGE_FORWARD,
|
|
g_param_spec_boolean ("message-forward", "Message Forward",
|
|
"Forwards all children messages",
|
|
DEFAULT_MESSAGE_FORWARD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
gobject_class->dispose = gst_bin_dispose;
|
|
|
|
#if !defined(GST_DISABLE_LOADSAVE) && !defined(GST_REMOVE_DEPRECATED)
|
|
gstobject_class->save_thyself =
|
|
((gpointer (*)(GstObject * object,
|
|
gpointer self)) * GST_DEBUG_FUNCPTR (gst_bin_save_thyself));
|
|
gstobject_class->restore_thyself =
|
|
((void (*)(GstObject * object,
|
|
gpointer self)) *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);
|
|
gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_bin_get_index_func);
|
|
gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_bin_set_index_func);
|
|
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);
|
|
|
|
klass->do_latency = GST_DEBUG_FUNCPTR (gst_bin_do_latency_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, GstBinClass * klass)
|
|
{
|
|
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 = GST_BIN_GET_PRIVATE (bin);
|
|
bin->priv->asynchandling = DEFAULT_ASYNC_HANDLING;
|
|
bin->priv->structure_cookie = 0;
|
|
bin->priv->message_forward = DEFAULT_MESSAGE_FORWARD;
|
|
}
|
|
|
|
static void
|
|
gst_bin_dispose (GObject * object)
|
|
{
|
|
GstBin *bin = GST_BIN_CAST (object);
|
|
GstBus **child_bus_p = &bin->child_bus;
|
|
GstClock **provided_clock_p = &bin->provided_clock;
|
|
GstElement **clock_provider_p = &bin->clock_provider;
|
|
GstIndex **index_p = &bin->priv->index;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, object, "dispose");
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
gst_object_replace ((GstObject **) child_bus_p, NULL);
|
|
gst_object_replace ((GstObject **) provided_clock_p, NULL);
|
|
gst_object_replace ((GstObject **) clock_provider_p, NULL);
|
|
gst_object_replace ((GstObject **) index_p, NULL);
|
|
bin_remove_messages (bin, NULL, GST_MESSAGE_ANY);
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
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)));
|
|
}
|
|
|
|
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: (transfer full): a new #GstBin
|
|
*/
|
|
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_CAST (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;
|
|
case PROP_MESSAGE_FORWARD:
|
|
GST_OBJECT_LOCK (gstbin);
|
|
gstbin->priv->message_forward = 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_CAST (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;
|
|
case PROP_MESSAGE_FORWARD:
|
|
GST_OBJECT_LOCK (gstbin);
|
|
g_value_set_boolean (value, gstbin->priv->message_forward);
|
|
GST_OBJECT_UNLOCK (gstbin);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* return the cached index */
|
|
static GstIndex *
|
|
gst_bin_get_index_func (GstElement * element)
|
|
{
|
|
GstBin *bin;
|
|
GstIndex *result;
|
|
|
|
bin = GST_BIN_CAST (element);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
if ((result = bin->priv->index))
|
|
gst_object_ref (result);
|
|
GST_OBJECT_UNLOCK (bin);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* set the index on all elements in this bin
|
|
*
|
|
* MT safe
|
|
*/
|
|
static void
|
|
gst_bin_set_index_func (GstElement * element, GstIndex * index)
|
|
{
|
|
GstBin *bin;
|
|
gboolean done;
|
|
GstIterator *it;
|
|
GstIndex *old;
|
|
|
|
bin = GST_BIN_CAST (element);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
old = bin->priv->index;
|
|
if (G_UNLIKELY (old == index))
|
|
goto was_set;
|
|
if (index)
|
|
gst_object_ref (index);
|
|
bin->priv->index = index;
|
|
GST_OBJECT_UNLOCK (bin);
|
|
|
|
if (old)
|
|
gst_object_unref (old);
|
|
|
|
it = gst_bin_iterate_elements (bin);
|
|
|
|
/* set the index on all elements in the bin */
|
|
done = FALSE;
|
|
while (!done) {
|
|
gpointer data;
|
|
|
|
switch (gst_iterator_next (it, &data)) {
|
|
case GST_ITERATOR_OK:
|
|
{
|
|
GstElement *child = GST_ELEMENT_CAST (data);
|
|
|
|
GST_DEBUG_OBJECT (bin, "setting index on '%s'",
|
|
GST_ELEMENT_NAME (child));
|
|
gst_element_set_index (child, index);
|
|
|
|
gst_object_unref (child);
|
|
break;
|
|
}
|
|
case GST_ITERATOR_RESYNC:
|
|
GST_DEBUG_OBJECT (bin, "iterator doing resync");
|
|
gst_iterator_resync (it);
|
|
break;
|
|
default:
|
|
case GST_ITERATOR_DONE:
|
|
GST_DEBUG_OBJECT (bin, "iterator done");
|
|
done = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
gst_iterator_free (it);
|
|
return;
|
|
|
|
was_set:
|
|
{
|
|
GST_DEBUG_OBJECT (bin, "index was already set");
|
|
GST_OBJECT_UNLOCK (bin);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* set the clock on all elements in this bin
|
|
*
|
|
* MT safe
|
|
*/
|
|
static gboolean
|
|
gst_bin_set_clock_func (GstElement * element, GstClock * clock)
|
|
{
|
|
GstBin *bin;
|
|
gboolean done;
|
|
GstIterator *it;
|
|
gboolean res = TRUE;
|
|
|
|
bin = GST_BIN_CAST (element);
|
|
|
|
it = gst_bin_iterate_elements (bin);
|
|
|
|
done = FALSE;
|
|
while (!done) {
|
|
gpointer data;
|
|
|
|
switch (gst_iterator_next (it, &data)) {
|
|
case GST_ITERATOR_OK:
|
|
{
|
|
GstElement *child = GST_ELEMENT_CAST (data);
|
|
|
|
res &= gst_element_set_clock (child, clock);
|
|
|
|
gst_object_unref (child);
|
|
break;
|
|
}
|
|
case GST_ITERATOR_RESYNC:
|
|
GST_DEBUG_OBJECT (bin, "iterator doing resync");
|
|
gst_iterator_resync (it);
|
|
res = TRUE;
|
|
break;
|
|
default:
|
|
case GST_ITERATOR_DONE:
|
|
GST_DEBUG_OBJECT (bin, "iterator done");
|
|
done = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
gst_iterator_free (it);
|
|
|
|
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_CAST (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;
|
|
GST_LOG ("looking at message %p: %d", message, eq);
|
|
|
|
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 ownership of
|
|
* 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;
|
|
|
|
if ((src = GST_MESSAGE_SRC (message))) {
|
|
/* first find the previous message posted by this element */
|
|
if ((previous = find_message (bin, src, types))) {
|
|
GstMessage *previous_msg;
|
|
|
|
/* if we found a previous message, replace it */
|
|
previous_msg = previous->data;
|
|
previous->data = message;
|
|
|
|
GST_DEBUG_OBJECT (bin, "replace old message %s from %s with %s message",
|
|
GST_MESSAGE_TYPE_NAME (previous_msg), GST_ELEMENT_NAME (src),
|
|
GST_MESSAGE_TYPE_NAME (message));
|
|
|
|
gst_message_unref (previous_msg);
|
|
} else {
|
|
/* keep new message */
|
|
bin->messages = g_list_prepend (bin->messages, message);
|
|
|
|
GST_DEBUG_OBJECT (bin, "got new message %p, %s from %s",
|
|
message, GST_MESSAGE_TYPE_NAME (message), GST_ELEMENT_NAME (src));
|
|
}
|
|
} else {
|
|
GST_DEBUG_OBJECT (bin, "got message %s from (NULL), not processing",
|
|
GST_MESSAGE_TYPE_NAME (message));
|
|
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, is_source;
|
|
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);
|
|
is_source = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_IS_SOURCE);
|
|
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 (is_source) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, bin, "element \"%s\" was source",
|
|
elem_name);
|
|
GST_OBJECT_FLAG_SET (bin, GST_ELEMENT_IS_SOURCE);
|
|
}
|
|
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++;
|
|
bin->priv->structure_cookie++;
|
|
|
|
/* distribute the bus */
|
|
gst_element_set_bus (element, bin->child_bus);
|
|
|
|
/* propagate the current base_time, start_time and clock */
|
|
gst_element_set_base_time (element, GST_ELEMENT_CAST (bin)->base_time);
|
|
gst_element_set_start_time (element, GST_ELEMENT_START_TIME (bin));
|
|
/* 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));
|
|
/* set the cached index on the children */
|
|
if (bin->priv->index)
|
|
gst_element_set_index (element, bin->priv->index);
|
|
|
|
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, FALSE);
|
|
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 (bin, gst_bin_signals[ELEMENT_ADDED], 0, element);
|
|
gst_child_proxy_child_added ((GstObject *) bin, (GstObject *) 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: (transfer full): 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.
|
|
*/
|
|
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, is_source, othersink, othersource, found;
|
|
GstMessage *clock_message = NULL;
|
|
GstClock **provided_clock_p;
|
|
GstElement **clock_provider_p;
|
|
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);
|
|
is_source = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_IS_SOURCE);
|
|
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;
|
|
othersource = 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, child_source;
|
|
|
|
GST_OBJECT_LOCK (child);
|
|
child_sink = GST_OBJECT_FLAG_IS_SET (child, GST_ELEMENT_IS_SINK);
|
|
child_source = GST_OBJECT_FLAG_IS_SET (child, GST_ELEMENT_IS_SOURCE);
|
|
/* when we remove a sink, check if there are other sinks. */
|
|
if (is_sink && !othersink && child_sink)
|
|
othersink = TRUE;
|
|
if (is_source && !othersource && child_source)
|
|
othersource = 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++;
|
|
bin->priv->structure_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 (is_source && !othersource) {
|
|
/* we're not a source anymore */
|
|
GST_DEBUG_OBJECT (bin, "we removed the last source");
|
|
GST_OBJECT_FLAG_UNSET (bin, GST_ELEMENT_IS_SOURCE);
|
|
}
|
|
|
|
|
|
/* 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);
|
|
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);
|
|
}
|
|
|
|
/* 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));
|
|
gboolean remove;
|
|
|
|
next = g_list_next (walk);
|
|
remove = FALSE;
|
|
|
|
switch (GST_MESSAGE_TYPE (message)) {
|
|
case GST_MESSAGE_ASYNC_START:
|
|
if (src == element)
|
|
this_async = TRUE;
|
|
else
|
|
other_async = TRUE;
|
|
|
|
GST_DEBUG_OBJECT (src, "looking at message %p", message);
|
|
break;
|
|
case GST_MESSAGE_STRUCTURE_CHANGE:
|
|
{
|
|
GstElement *owner;
|
|
|
|
GST_DEBUG_OBJECT (src, "looking at structure change message %p",
|
|
message);
|
|
/* it's unlikely that this message is still in the list of messages
|
|
* because this would mean that a link/unlink is busy in another thread
|
|
* while we remove the element. We still have to remove the message
|
|
* because we might not receive the done message anymore when the element
|
|
* is removed from the bin. */
|
|
gst_message_parse_structure_change (message, NULL, &owner, NULL);
|
|
if (owner == element)
|
|
remove = TRUE;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
if (src == element)
|
|
remove = TRUE;
|
|
|
|
if (remove) {
|
|
/* delete all message types */
|
|
GST_DEBUG_OBJECT (src, "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, FALSE);
|
|
} 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 (bin, gst_bin_signals[ELEMENT_REMOVED], 0, element);
|
|
gst_child_proxy_child_removed ((GstObject *) bin, (GstObject *) 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: (transfer none): 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.
|
|
*/
|
|
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: (transfer full): a #GstIterator of #GstElement, or NULL
|
|
*/
|
|
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_CAST (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: (transfer full): a #GstIterator of #GstElement, or NULL
|
|
*/
|
|
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: (transfer full): a #GstIterator of #GstElement, or NULL
|
|
*/
|
|
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;
|
|
|
|
/* we lock the child here for the remainder of the function to
|
|
* get its name and other info safely. */
|
|
GST_OBJECT_LOCK (child);
|
|
is_src = GST_OBJECT_FLAG_IS_SET (child, GST_ELEMENT_IS_SOURCE);
|
|
|
|
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 the
|
|
* #GST_ELEMENT_IS_SOURCE flag set.
|
|
*
|
|
* Each element yielded by the iterator will have its refcount increased, so
|
|
* unref after use.
|
|
*
|
|
* MT safe. Caller owns returned value.
|
|
*
|
|
* Returns: (transfer full): a #GstIterator of #GstElement, or NULL
|
|
*/
|
|
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 */
|
|
gboolean dirty; /* we detected structure change */
|
|
} 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 sinkpads */
|
|
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 *pad, *peer;
|
|
|
|
pad = GST_PAD_CAST (pads->data);
|
|
|
|
/* we're iterating over the sinkpads, check if it's busy in a link/unlink */
|
|
if (G_UNLIKELY (find_message (bit->bin, GST_OBJECT_CAST (pad),
|
|
GST_MESSAGE_STRUCTURE_CHANGE))) {
|
|
/* mark the iterator as dirty because we won't be updating the degree
|
|
* of the peer parent now. This would result in the 'loop detected'
|
|
* later on because the peer parent element could become the best next
|
|
* element with a degree > 0. We will simply continue our state
|
|
* changes and we'll eventually resync when the unlink completed and
|
|
* the iterator cookie is updated. */
|
|
bit->dirty = TRUE;
|
|
continue;
|
|
}
|
|
|
|
if ((peer = gst_pad_get_peer (pad))) {
|
|
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, it is possible that an element was in 0 and
|
|
* reaches -1 here. This would mean that the element had no sinkpads
|
|
* but became linked while the state change was happening. We will
|
|
* resync on this with the structure change message. */
|
|
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)) {
|
|
/* when we detected an unlink, don't warn because our degrees might be
|
|
* screwed up. We will resync later */
|
|
if (bit->best_deg != 0 && !bit->dirty) {
|
|
/* 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");
|
|
bit->dirty = FALSE;
|
|
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->priv->structure_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: (transfer full): a #GstIterator of #GstElement, or NULL
|
|
*/
|
|
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, GstClockTime start_time, GstState current,
|
|
GstState next)
|
|
{
|
|
GstStateChangeReturn ret;
|
|
GstState pending, child_current, child_pending;
|
|
gboolean locked;
|
|
GList *found;
|
|
|
|
GST_STATE_LOCK (element);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
/* set base_time and start time on child */
|
|
GST_ELEMENT_START_TIME (element) = start_time;
|
|
element->base_time = base_time;
|
|
/* peel off the locked flag */
|
|
locked = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
/* Get the previous set_state result to preserve NO_PREROLL and ASYNC */
|
|
ret = GST_STATE_RETURN (element);
|
|
child_current = GST_STATE (element);
|
|
child_pending = GST_STATE_PENDING (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);
|
|
pending = GST_STATE_PENDING (bin);
|
|
|
|
/* Try not to change the state of elements that are already in the state we're
|
|
* going to */
|
|
if (!(next == GST_STATE_PLAYING || child_pending != GST_STATE_VOID_PENDING ||
|
|
(child_pending == GST_STATE_VOID_PENDING &&
|
|
((pending > child_current && next > child_current) ||
|
|
(pending < child_current && next < child_current)))))
|
|
goto unneeded;
|
|
|
|
/* 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));
|
|
|
|
/* change state */
|
|
ret = gst_element_set_state (element, next);
|
|
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
return ret;
|
|
|
|
locked:
|
|
{
|
|
GST_DEBUG_OBJECT (element,
|
|
"element is locked, return previous return %s",
|
|
gst_element_state_change_return_get_name (ret));
|
|
GST_STATE_UNLOCK (element);
|
|
return ret;
|
|
}
|
|
was_busy:
|
|
{
|
|
GST_DEBUG_OBJECT (element, "element was busy, delaying state change");
|
|
GST_OBJECT_UNLOCK (bin);
|
|
GST_STATE_UNLOCK (element);
|
|
return GST_STATE_CHANGE_ASYNC;
|
|
}
|
|
unneeded:
|
|
{
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"skipping transition from %s to %s, since bin pending"
|
|
" is %s : last change state return follows",
|
|
gst_element_state_get_name (child_current),
|
|
gst_element_state_get_name (next),
|
|
gst_element_state_get_name (pending));
|
|
GST_OBJECT_UNLOCK (bin);
|
|
GST_STATE_UNLOCK (element);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_bin_recalculate_latency:
|
|
* @bin: a #GstBin
|
|
*
|
|
* Query @bin for the current latency using and reconfigures this latency to all the
|
|
* elements with a LATENCY event.
|
|
*
|
|
* This method is typically called on the pipeline when a #GST_MESSAGE_LATENCY
|
|
* is posted on the bus.
|
|
*
|
|
* This function simply emits the 'do-latency' signal so any custom latency
|
|
* calculations will be performed.
|
|
*
|
|
* Returns: %TRUE if the latency could be queried and reconfigured.
|
|
*
|
|
* Since: 0.10.22.
|
|
*/
|
|
gboolean
|
|
gst_bin_recalculate_latency (GstBin * bin)
|
|
{
|
|
gboolean res;
|
|
|
|
g_signal_emit (bin, gst_bin_signals[DO_LATENCY], 0, &res);
|
|
GST_DEBUG_OBJECT (bin, "latency returned %d", res);
|
|
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
gst_bin_do_latency_func (GstBin * bin)
|
|
{
|
|
GstQuery *query;
|
|
GstElement *element;
|
|
GstClockTime min_latency, max_latency;
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
|
|
|
|
element = GST_ELEMENT_CAST (bin);
|
|
|
|
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, start_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)
|
|
gst_bin_recalculate_latency (bin);
|
|
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);
|
|
start_time = gst_element_get_start_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, start_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:{
|
|
GstObject *parent;
|
|
|
|
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));
|
|
|
|
/* Only fail if the child is still inside
|
|
* this bin. It might've been removed already
|
|
* because of the error by the bin subclass
|
|
* to ignore the error. */
|
|
parent = gst_object_get_parent (GST_OBJECT_CAST (child));
|
|
if (parent == GST_OBJECT_CAST (element)) {
|
|
/* element is still in bin, really error now */
|
|
gst_object_unref (child);
|
|
gst_object_unref (parent);
|
|
goto done;
|
|
}
|
|
/* child removed from bin, let the resync code redo the state
|
|
* change */
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"child '%s' was removed from the bin",
|
|
GST_ELEMENT_NAME (child));
|
|
|
|
if (parent)
|
|
gst_object_unref (parent);
|
|
|
|
break;
|
|
}
|
|
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) {
|
|
GST_CAT_DEBUG (GST_CAT_STATES,
|
|
"we have NO_PREROLL elements %s -> NO_PREROLL",
|
|
gst_element_state_change_return_get_name (ret));
|
|
ret = GST_STATE_CHANGE_NO_PREROLL;
|
|
} else if (have_async) {
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "we have ASYNC elements %s -> ASYNC",
|
|
gst_element_state_change_return_get_name (ret));
|
|
ret = GST_STATE_CHANGE_ASYNC;
|
|
}
|
|
|
|
done:
|
|
gst_iterator_free (it);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
bin->polling = FALSE;
|
|
/* it's possible that we did not get ASYNC from the children while the bin is
|
|
* simulating ASYNC behaviour by posting an ASYNC_DONE message on the bus with
|
|
* itself as the source. In that case we still want to check if the state
|
|
* change completed. */
|
|
if (ret != GST_STATE_CHANGE_ASYNC && !bin->priv->pending_async_done) {
|
|
/* no element returned ASYNC and there are no pending async_done messages,
|
|
* 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, FALSE);
|
|
}
|
|
|
|
state_end:
|
|
bin->priv->pending_async_done = FALSE;
|
|
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_CAST (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;
|
|
|
|
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;
|
|
GST_STATE_PENDING (bin) = pending;
|
|
/* 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));
|
|
|
|
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_slice_free (BinContinueData, 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_slice_free (BinContinueData, 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,
|
|
gboolean flag_pending)
|
|
{
|
|
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 {
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
|
|
"setting state from %s to %s, pending %s",
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (pending));
|
|
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_slice_new (BinContinueData);
|
|
|
|
/* 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) = GST_STATE_GET_NEXT (old_state, 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");
|
|
/* if we were busy with a state change and we are requested to flag a
|
|
* pending async done, we do so here */
|
|
if (flag_pending)
|
|
bin->priv->pending_async_done = TRUE;
|
|
return;
|
|
}
|
|
nothing_pending:
|
|
{
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin, "nothing pending");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* must be called with the object lock. This function releases the lock to post
|
|
* the message. */
|
|
static void
|
|
bin_do_message_forward (GstBin * bin, GstMessage * message)
|
|
{
|
|
if (bin->priv->message_forward) {
|
|
GstMessage *forwarded;
|
|
|
|
GST_DEBUG_OBJECT (bin, "pass %s message upward",
|
|
GST_MESSAGE_TYPE_NAME (message));
|
|
GST_OBJECT_UNLOCK (bin);
|
|
|
|
/* we need to convert these messages to element messages so that our parent
|
|
* bin can easily ignore them and so that the application can easily
|
|
* distinguish between the internally forwarded and the real messages. */
|
|
forwarded = gst_message_new_element (GST_OBJECT_CAST (bin),
|
|
gst_structure_new ("GstBinForwarded",
|
|
"message", GST_TYPE_MESSAGE, message, NULL));
|
|
|
|
gst_element_post_message (GST_ELEMENT_CAST (bin), forwarded);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
GstMessage *tmessage;
|
|
guint32 seqnum;
|
|
|
|
src = GST_MESSAGE_SRC (message);
|
|
type = GST_MESSAGE_TYPE (message);
|
|
|
|
GST_DEBUG_OBJECT (bin, "[msg %p] handling child %s message of type %s",
|
|
message, src ? GST_ELEMENT_NAME (src) : "(NULL)",
|
|
GST_MESSAGE_TYPE_NAME (message));
|
|
|
|
switch (type) {
|
|
case GST_MESSAGE_ERROR:
|
|
{
|
|
GST_OBJECT_LOCK (bin);
|
|
/* flag error */
|
|
GST_DEBUG_OBJECT (bin, "got ERROR message, unlocking state change");
|
|
GST_STATE_RETURN (bin) = GST_STATE_CHANGE_FAILURE;
|
|
GST_STATE_BROADCAST (bin);
|
|
GST_OBJECT_UNLOCK (bin);
|
|
|
|
goto forward;
|
|
}
|
|
case GST_MESSAGE_EOS:
|
|
{
|
|
gboolean eos;
|
|
|
|
/* collect all eos messages from the children */
|
|
GST_OBJECT_LOCK (bin);
|
|
bin_do_message_forward (bin, message);
|
|
/* ref message for future use */
|
|
gst_message_ref (message);
|
|
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) {
|
|
seqnum = gst_message_get_seqnum (message);
|
|
tmessage = gst_message_new_eos (GST_OBJECT_CAST (bin));
|
|
gst_message_set_seqnum (tmessage, seqnum);
|
|
|
|
GST_DEBUG_OBJECT (bin,
|
|
"all sinks posted EOS, posting seqnum #%" G_GUINT32_FORMAT, seqnum);
|
|
gst_element_post_message (GST_ELEMENT_CAST (bin), tmessage);
|
|
}
|
|
gst_message_unref (message);
|
|
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:{
|
|
gboolean post = FALSE;
|
|
GstFormat format;
|
|
gint64 position;
|
|
|
|
gst_message_parse_segment_start (message, &format, &position);
|
|
seqnum = gst_message_get_seqnum (message);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
bin_do_message_forward (bin, message);
|
|
/* if this is the first segment-start, post to parent but not to the
|
|
* application */
|
|
if (!find_message (bin, NULL, GST_MESSAGE_SEGMENT_START) &&
|
|
(GST_OBJECT_PARENT (bin) != NULL)) {
|
|
post = TRUE;
|
|
}
|
|
/* 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);
|
|
if (post) {
|
|
tmessage = gst_message_new_segment_start (GST_OBJECT_CAST (bin),
|
|
format, position);
|
|
gst_message_set_seqnum (tmessage, seqnum);
|
|
|
|
/* post segment start with initial format and position. */
|
|
GST_DEBUG_OBJECT (bin, "posting SEGMENT_START (%u) bus message: %p",
|
|
seqnum, message);
|
|
gst_element_post_message (GST_ELEMENT_CAST (bin), tmessage);
|
|
}
|
|
break;
|
|
}
|
|
case GST_MESSAGE_SEGMENT_DONE:
|
|
{
|
|
gboolean post = FALSE;
|
|
GstFormat format;
|
|
gint64 position;
|
|
|
|
gst_message_parse_segment_done (message, &format, &position);
|
|
seqnum = gst_message_get_seqnum (message);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
bin_do_message_forward (bin, message);
|
|
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) {
|
|
tmessage = gst_message_new_segment_done (GST_OBJECT_CAST (bin),
|
|
format, position);
|
|
gst_message_set_seqnum (tmessage, seqnum);
|
|
|
|
/* post segment done with latest format and position. */
|
|
GST_DEBUG_OBJECT (bin, "posting SEGMENT_DONE (%u) bus message: %p",
|
|
seqnum, message);
|
|
gst_element_post_message (GST_ELEMENT_CAST (bin), tmessage);
|
|
}
|
|
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;
|
|
|
|
GST_DEBUG_OBJECT (bin, "ASYNC_START message %p, %s", message,
|
|
src ? GST_OBJECT_NAME (src) : "(NULL)");
|
|
|
|
gst_message_parse_async_start (message, &new_base_time);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
bin_do_message_forward (bin, message);
|
|
|
|
/* we ignore the message if we are going to <= READY */
|
|
if ((target = GST_STATE_TARGET (bin)) <= 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;
|
|
|
|
GST_DEBUG_OBJECT (bin, "ASYNC_DONE message %p, %s", message,
|
|
src ? GST_OBJECT_NAME (src) : "(NULL)");
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
bin_do_message_forward (bin, message);
|
|
|
|
/* ignore messages if we are shutting down */
|
|
if ((target = GST_STATE_TARGET (bin)) <= 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");
|
|
/* when we get an async done message when a state change was busy, we
|
|
* need to set the pending_done flag so that at the end of the state
|
|
* change we can see if we need to verify pending async elements, hence
|
|
* the TRUE argument here. */
|
|
bin_handle_async_done (bin, GST_STATE_CHANGE_SUCCESS, TRUE);
|
|
} else {
|
|
GST_DEBUG_OBJECT (bin, "there are more async elements pending");
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
case GST_MESSAGE_STRUCTURE_CHANGE:
|
|
{
|
|
gboolean busy;
|
|
|
|
gst_message_parse_structure_change (message, NULL, NULL, &busy);
|
|
|
|
GST_OBJECT_LOCK (bin);
|
|
if (busy) {
|
|
/* while the pad is busy, avoid following it when doing state changes.
|
|
* Don't update the cookie yet, we will do that after the structure
|
|
* change finished and we are ready to inspect the new updated
|
|
* structure. */
|
|
bin_replace_message (bin, message, GST_MESSAGE_STRUCTURE_CHANGE);
|
|
message = NULL;
|
|
} else {
|
|
/* a pad link/unlink ended, signal the state change iterator that we
|
|
* need to resync by updating the structure_cookie. */
|
|
bin_remove_messages (bin, GST_MESSAGE_SRC (message),
|
|
GST_MESSAGE_STRUCTURE_CHANGE);
|
|
bin->priv->structure_cookie++;
|
|
}
|
|
GST_OBJECT_UNLOCK (bin);
|
|
|
|
if (message)
|
|
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 (live) {
|
|
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_CAST (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;
|
|
|
|
/* set the result of the query to FALSE initially */
|
|
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: (transfer full): the #GstElement with the given name, or NULL
|
|
*/
|
|
GstElement *
|
|
gst_bin_get_by_name (GstBin * bin, const gchar * name)
|
|
{
|
|
GstIterator *children;
|
|
gpointer 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: (transfer full): the #GstElement with the given name, or NULL
|
|
*/
|
|
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: (transfer full): A #GstElement inside the bin implementing the interface
|
|
*/
|
|
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: (transfer full): a #GstIterator of #GstElement for all elements
|
|
* in the bin implementing the given interface, or NULL
|
|
*/
|
|
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;
|
|
}
|
|
|
|
#if !defined(GST_DISABLE_LOADSAVE) && !defined(GST_REMOVE_DEPRECATED)
|
|
static xmlNodePtr
|
|
gst_bin_save_thyself (GstObject * object, xmlNodePtr parent)
|
|
{
|
|
GstBin *bin = GST_BIN_CAST (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 = g_list_last (bin->children);
|
|
while (children) {
|
|
child = GST_ELEMENT_CAST (children->data);
|
|
elementnode = xmlNewChild (childlist, NULL, (xmlChar *) "element", NULL);
|
|
gst_object_save_thyself (GST_OBJECT (child), elementnode);
|
|
children = g_list_previous (children);
|
|
}
|
|
return childlist;
|
|
}
|
|
|
|
static void
|
|
gst_bin_restore_thyself (GstObject * object, xmlNodePtr self)
|
|
{
|
|
GstBin *bin = GST_BIN_CAST (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 */
|