/usr/include/d/gtkd-3/gstreamer/Bus.d is in libgstreamerd-3-dev 3.7.5-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This file is part of gtkD.
*
* gtkD is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3
* of the License, or (at your option) any later version, with
* some exceptions, please read the COPYING file.
*
* gtkD is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with gtkD; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
// generated automatically - do not change
// find conversion definition on APILookup.txt
// implement new conversion functionalities on the wrap.utils pakage
module gstreamer.Bus;
private import glib.ConstructionException;
private import glib.Source;
private import gobject.ObjectG;
private import gobject.Signals;
private import gstreamer.Message;
private import gstreamer.ObjectGst;
private import gstreamer.c.functions;
public import gstreamer.c.types;
public import gstreamerc.gstreamertypes;
private import std.algorithm;
/**
* The #GstBus is an object responsible for delivering #GstMessage packets in
* a first-in first-out way from the streaming threads (see #GstTask) to the
* application.
*
* Since the application typically only wants to deal with delivery of these
* messages from one thread, the GstBus will marshall the messages between
* different threads. This is important since the actual streaming of media
* is done in another thread than the application.
*
* The GstBus provides support for #GSource based notifications. This makes it
* possible to handle the delivery in the glib mainloop.
*
* The #GSource callback function gst_bus_async_signal_func() can be used to
* convert all bus messages into signal emissions.
*
* A message is posted on the bus with the gst_bus_post() method. With the
* gst_bus_peek() and gst_bus_pop() methods one can look at or retrieve a
* previously posted message.
*
* The bus can be polled with the gst_bus_poll() method. This methods blocks
* up to the specified timeout value until one of the specified messages types
* is posted on the bus. The application can then gst_bus_pop() the messages
* from the bus to handle them.
* Alternatively the application can register an asynchronous bus function
* using gst_bus_add_watch_full() or gst_bus_add_watch(). This function will
* install a #GSource in the default glib main loop and will deliver messages
* a short while after they have been posted. Note that the main loop should
* be running for the asynchronous callbacks.
*
* It is also possible to get messages from the bus without any thread
* marshalling with the gst_bus_set_sync_handler() method. This makes it
* possible to react to a message in the same thread that posted the
* message on the bus. This should only be used if the application is able
* to deal with messages from different threads.
*
* Every #GstPipeline has one bus.
*
* Note that a #GstPipeline will set its bus into flushing state when changing
* from READY to NULL state.
*/
public class Bus : ObjectGst
{
/** the main Gtk struct */
protected GstBus* gstBus;
/** Get the main Gtk struct */
public GstBus* getBusStruct(bool transferOwnership = false)
{
if (transferOwnership)
ownedRef = false;
return gstBus;
}
/** the main Gtk struct as a void* */
protected override void* getStruct()
{
return cast(void*)gstBus;
}
protected override void setStruct(GObject* obj)
{
gstBus = cast(GstBus*)obj;
super.setStruct(obj);
}
/**
* Sets our main struct and passes it to the parent class.
*/
public this (GstBus* gstBus, bool ownedRef = false)
{
this.gstBus = gstBus;
super(cast(GstObject*)gstBus, ownedRef);
}
/**
* Adds a bus watch to the default main context with the default priority.
* This function is used to receive asynchronous messages in the main loop.
* The watch can be removed using g_source_remove() or by returning FALSE
* from func.
* MT safe.
* Params:
* dlg = A function to call when a message is received.
* Returns:
* The event source id.
*/
public uint addWatch( bool delegate(Message) dlg )
{
onWatchListener = dlg;
return gst_bus_add_watch(gstBus, cast(GstBusFunc)&watchCallBack, cast(void*)this);
}
bool delegate(Message) onWatchListener;
extern(C) static int watchCallBack(GstBus* bus, GstMessage* msg, Bus bus_d )//gpointer data)
{
Message msg_d = new Message( msg );
return bus_d.onWatchListener( msg_d );
}
/**
* Use this for making an XOverlay.
* Sets the synchronous handler on the bus. The function will be called
* every time a new message is posted on the bus. Note that the function
* will be called in the same thread context as the posting object. This
* function is usually only called by the creator of the bus. Applications
* should handle messages asynchronously using the gst_bus watch and poll
* functions.
* You cannot replace an existing sync_handler. You can pass NULL to this
* function, which will clear the existing handler.
* Params:
* dlg = The handler function to install
*/
public void setSyncHandler( GstBusSyncReply delegate(Message) dlg )
{
onSyncHandlerListener = dlg;
gst_bus_set_sync_handler(gstBus, cast(GstBusSyncHandler)&syncHandlerCallBack, cast(void*)this, null);
}
GstBusSyncReply delegate(Message) onSyncHandlerListener;
extern(C) static GstBusSyncReply syncHandlerCallBack(GstBus* bus, GstMessage* msg, Bus bus_d)
{
Message msg_d = new Message( msg );
return bus_d.onSyncHandlerListener( msg_d );
}
/**
*/
/** */
public static GType getType()
{
return gst_bus_get_type();
}
/**
* Creates a new #GstBus instance.
*
* Returns: a new #GstBus instance
*
* Throws: ConstructionException GTK+ fails to create the object.
*/
public this()
{
auto p = gst_bus_new();
if(p is null)
{
throw new ConstructionException("null returned by new");
}
this(cast(GstBus*) p, true);
}
/**
* Adds a bus signal watch to the default main context with the default priority
* (%G_PRIORITY_DEFAULT). It is also possible to use a non-default
* main context set up using g_main_context_push_thread_default() (before
* one had to create a bus watch source and attach it to the desired main
* context 'manually').
*
* After calling this statement, the bus will emit the "message" signal for each
* message posted on the bus.
*
* This function may be called multiple times. To clean up, the caller is
* responsible for calling gst_bus_remove_signal_watch() as many times as this
* function is called.
*
* MT safe.
*/
public void addSignalWatch()
{
gst_bus_add_signal_watch(gstBus);
}
/**
* Adds a bus signal watch to the default main context with the given @priority
* (e.g. %G_PRIORITY_DEFAULT). It is also possible to use a non-default main
* context set up using g_main_context_push_thread_default()
* (before one had to create a bus watch source and attach it to the desired
* main context 'manually').
*
* After calling this statement, the bus will emit the "message" signal for each
* message posted on the bus when the main loop is running.
*
* This function may be called multiple times. To clean up, the caller is
* responsible for calling gst_bus_remove_signal_watch() as many times as this
* function is called.
*
* There can only be a single bus watch per bus, you must remove any signal
* watch before you can set another type of watch.
*
* MT safe.
*
* Params:
* priority = The priority of the watch.
*/
public void addSignalWatchFull(int priority)
{
gst_bus_add_signal_watch_full(gstBus, priority);
}
/**
* Adds a bus watch to the default main context with the given @priority (e.g.
* %G_PRIORITY_DEFAULT). It is also possible to use a non-default main
* context set up using g_main_context_push_thread_default() (before
* one had to create a bus watch source and attach it to the desired main
* context 'manually').
*
* This function is used to receive asynchronous messages in the main loop.
* There can only be a single bus watch per bus, you must remove it before you
* can set a new one.
*
* The bus watch will only work if a GLib main loop is being run.
*
* When @func is called, the message belongs to the caller; if you want to
* keep a copy of it, call gst_message_ref() before leaving @func.
*
* The watch can be removed using gst_bus_remove_watch() or by returning %FALSE
* from @func. If the watch was added to the default main context it is also
* possible to remove the watch using g_source_remove().
*
* MT safe.
*
* Params:
* priority = The priority of the watch.
* func = A function to call when a message is received.
* userData = user data passed to @func.
* notify = the function to call when the source is removed.
*
* Returns: The event source id or 0 if @bus already got an event source.
*/
public uint addWatchFull(int priority, GstBusFunc func, void* userData, GDestroyNotify notify)
{
return gst_bus_add_watch_full(gstBus, priority, func, userData, notify);
}
/**
* A helper #GstBusFunc that can be used to convert all asynchronous messages
* into signals.
*
* Params:
* message = the #GstMessage received
* data = user data
*
* Returns: %TRUE
*/
public bool asyncSignalFunc(Message message, void* data)
{
return gst_bus_async_signal_func(gstBus, (message is null) ? null : message.getMessageStruct(), data) != 0;
}
/**
* Create watch for this bus. The GSource will be dispatched whenever
* a message is on the bus. After the GSource is dispatched, the
* message is popped off the bus and unreffed.
*
* Returns: a #GSource that can be added to a mainloop.
*/
public Source createWatch()
{
auto p = gst_bus_create_watch(gstBus);
if(p is null)
{
return null;
}
return new Source(cast(GSource*) p, true);
}
/**
* Instructs GStreamer to stop emitting the "sync-message" signal for this bus.
* See gst_bus_enable_sync_message_emission() for more information.
*
* In the event that multiple pieces of code have called
* gst_bus_enable_sync_message_emission(), the sync-message emissions will only
* be stopped after all calls to gst_bus_enable_sync_message_emission() were
* "cancelled" by calling this function. In this way the semantics are exactly
* the same as gst_object_ref() that which calls enable should also call
* disable.
*
* MT safe.
*/
public void disableSyncMessageEmission()
{
gst_bus_disable_sync_message_emission(gstBus);
}
/**
* Instructs GStreamer to emit the "sync-message" signal after running the bus's
* sync handler. This function is here so that code can ensure that they can
* synchronously receive messages without having to affect what the bin's sync
* handler is.
*
* This function may be called multiple times. To clean up, the caller is
* responsible for calling gst_bus_disable_sync_message_emission() as many times
* as this function is called.
*
* While this function looks similar to gst_bus_add_signal_watch(), it is not
* exactly the same -- this function enables <emphasis>synchronous</emphasis> emission of
* signals when messages arrive; gst_bus_add_signal_watch() adds an idle callback
* to pop messages off the bus <emphasis>asynchronously</emphasis>. The sync-message signal
* comes from the thread of whatever object posted the message; the "message"
* signal is marshalled to the main thread via the main loop.
*
* MT safe.
*/
public void enableSyncMessageEmission()
{
gst_bus_enable_sync_message_emission(gstBus);
}
/**
* Check if there are pending messages on the bus that
* should be handled.
*
* Returns: %TRUE if there are messages on the bus to be handled, %FALSE
* otherwise.
*
* MT safe.
*/
public bool havePending()
{
return gst_bus_have_pending(gstBus) != 0;
}
/**
* Peek the message on the top of the bus' queue. The message will remain
* on the bus' message queue. A reference is returned, and needs to be unreffed
* by the caller.
*
* Returns: the #GstMessage that is on the
* bus, or %NULL if the bus is empty.
*
* MT safe.
*/
public Message peek()
{
auto p = gst_bus_peek(gstBus);
if(p is null)
{
return null;
}
return ObjectG.getDObject!(Message)(cast(GstMessage*) p, true);
}
/**
* Poll the bus for messages. Will block while waiting for messages to come.
* You can specify a maximum time to poll with the @timeout parameter. If
* @timeout is negative, this function will block indefinitely.
*
* All messages not in @events will be popped off the bus and will be ignored.
* It is not possible to use message enums beyond #GST_MESSAGE_EXTENDED in the
* @events mask
*
* Because poll is implemented using the "message" signal enabled by
* gst_bus_add_signal_watch(), calling gst_bus_poll() will cause the "message"
* signal to be emitted for every message that poll sees. Thus a "message"
* signal handler will see the same messages that this function sees -- neither
* will steal messages from the other.
*
* This function will run a main loop from the default main context when
* polling.
*
* You should never use this function, since it is pure evil. This is
* especially true for GUI applications based on Gtk+ or Qt, but also for any
* other non-trivial application that uses the GLib main loop. As this function
* runs a GLib main loop, any callback attached to the default GLib main
* context may be invoked. This could be timeouts, GUI events, I/O events etc.;
* even if gst_bus_poll() is called with a 0 timeout. Any of these callbacks
* may do things you do not expect, e.g. destroy the main application window or
* some other resource; change other application state; display a dialog and
* run another main loop until the user clicks it away. In short, using this
* function may add a lot of complexity to your code through unexpected
* re-entrancy and unexpected changes to your application's state.
*
* For 0 timeouts use gst_bus_pop_filtered() instead of this function; for
* other short timeouts use gst_bus_timed_pop_filtered(); everything else is
* better handled by setting up an asynchronous bus watch and doing things
* from there.
*
* Params:
* events = a mask of #GstMessageType, representing the set of message types to
* poll for (note special handling of extended message types below)
* timeout = the poll timeout, as a #GstClockTime, or #GST_CLOCK_TIME_NONE to poll
* indefinitely.
*
* Returns: the message that was received,
* or %NULL if the poll timed out. The message is taken from the
* bus and needs to be unreffed with gst_message_unref() after
* usage.
*/
public Message poll(GstMessageType events, GstClockTime timeout)
{
auto p = gst_bus_poll(gstBus, events, timeout);
if(p is null)
{
return null;
}
return ObjectG.getDObject!(Message)(cast(GstMessage*) p, true);
}
/**
* Get a message from the bus.
*
* Returns: the #GstMessage that is on the
* bus, or %NULL if the bus is empty. The message is taken from
* the bus and needs to be unreffed with gst_message_unref() after
* usage.
*
* MT safe.
*/
public Message pop()
{
auto p = gst_bus_pop(gstBus);
if(p is null)
{
return null;
}
return ObjectG.getDObject!(Message)(cast(GstMessage*) p, true);
}
/**
* Get a message matching @type from the bus. Will discard all messages on
* the bus that do not match @type and that have been posted before the first
* message that does match @type. If there is no message matching @type on
* the bus, all messages will be discarded. It is not possible to use message
* enums beyond #GST_MESSAGE_EXTENDED in the @events mask.
*
* Params:
* types = message types to take into account
*
* Returns: the next #GstMessage matching
* @type that is on the bus, or %NULL if the bus is empty or there
* is no message matching @type. The message is taken from the bus
* and needs to be unreffed with gst_message_unref() after usage.
*
* MT safe.
*/
public Message popFiltered(GstMessageType types)
{
auto p = gst_bus_pop_filtered(gstBus, types);
if(p is null)
{
return null;
}
return ObjectG.getDObject!(Message)(cast(GstMessage*) p, true);
}
/**
* Post a message on the given bus. Ownership of the message
* is taken by the bus.
*
* Params:
* message = the #GstMessage to post
*
* Returns: %TRUE if the message could be posted, %FALSE if the bus is flushing.
*
* MT safe.
*/
public bool post(Message message)
{
return gst_bus_post(gstBus, (message is null) ? null : message.getMessageStruct()) != 0;
}
/**
* Removes a signal watch previously added with gst_bus_add_signal_watch().
*
* MT safe.
*/
public void removeSignalWatch()
{
gst_bus_remove_signal_watch(gstBus);
}
/**
* Removes an installed bus watch from @bus.
*
* Returns: %TRUE on success or %FALSE if @bus has no event source.
*
* Since: 1.6
*/
public bool removeWatch()
{
return gst_bus_remove_watch(gstBus) != 0;
}
/**
* If @flushing, flush out and unref any messages queued in the bus. Releases
* references to the message origin objects. Will flush future messages until
* gst_bus_set_flushing() sets @flushing to %FALSE.
*
* MT safe.
*
* Params:
* flushing = whether or not to flush the bus
*/
public void setFlushing(bool flushing)
{
gst_bus_set_flushing(gstBus, flushing);
}
/**
* A helper GstBusSyncHandler that can be used to convert all synchronous
* messages into signals.
*
* Params:
* message = the #GstMessage received
* data = user data
*
* Returns: GST_BUS_PASS
*/
public GstBusSyncReply syncSignalHandler(Message message, void* data)
{
return gst_bus_sync_signal_handler(gstBus, (message is null) ? null : message.getMessageStruct(), data);
}
/**
* Get a message from the bus, waiting up to the specified timeout.
*
* If @timeout is 0, this function behaves like gst_bus_pop(). If @timeout is
* #GST_CLOCK_TIME_NONE, this function will block forever until a message was
* posted on the bus.
*
* Params:
* timeout = a timeout
*
* Returns: the #GstMessage that is on the
* bus after the specified timeout or %NULL if the bus is empty
* after the timeout expired. The message is taken from the bus
* and needs to be unreffed with gst_message_unref() after usage.
*
* MT safe.
*/
public Message timedPop(GstClockTime timeout)
{
auto p = gst_bus_timed_pop(gstBus, timeout);
if(p is null)
{
return null;
}
return ObjectG.getDObject!(Message)(cast(GstMessage*) p, true);
}
/**
* Get a message from the bus whose type matches the message type mask @types,
* waiting up to the specified timeout (and discarding any messages that do not
* match the mask provided).
*
* If @timeout is 0, this function behaves like gst_bus_pop_filtered(). If
* @timeout is #GST_CLOCK_TIME_NONE, this function will block forever until a
* matching message was posted on the bus.
*
* Params:
* timeout = a timeout in nanoseconds, or GST_CLOCK_TIME_NONE to wait forever
* types = message types to take into account, GST_MESSAGE_ANY for any type
*
* Returns: a #GstMessage matching the
* filter in @types, or %NULL if no matching message was found on
* the bus until the timeout expired. The message is taken from
* the bus and needs to be unreffed with gst_message_unref() after
* usage.
*
* MT safe.
*/
public Message timedPopFiltered(GstClockTime timeout, GstMessageType types)
{
auto p = gst_bus_timed_pop_filtered(gstBus, timeout, types);
if(p is null)
{
return null;
}
return ObjectG.getDObject!(Message)(cast(GstMessage*) p, true);
}
protected class OnMessageDelegateWrapper
{
void delegate(Message, Bus) dlg;
gulong handlerId;
this(void delegate(Message, Bus) dlg)
{
this.dlg = dlg;
onMessageListeners ~= this;
}
void remove(OnMessageDelegateWrapper source)
{
foreach(index, wrapper; onMessageListeners)
{
if (wrapper.handlerId == source.handlerId)
{
onMessageListeners[index] = null;
onMessageListeners = std.algorithm.remove(onMessageListeners, index);
break;
}
}
}
}
OnMessageDelegateWrapper[] onMessageListeners;
/**
* A message has been posted on the bus. This signal is emitted from a
* GSource added to the mainloop. this signal will only be emitted when
* there is a mainloop running.
*
* Params:
* message = the message that has been posted asynchronously
*/
gulong addOnMessage(void delegate(Message, Bus) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
{
auto wrapper = new OnMessageDelegateWrapper(dlg);
wrapper.handlerId = Signals.connectData(
this,
"message",
cast(GCallback)&callBackMessage,
cast(void*)wrapper,
cast(GClosureNotify)&callBackMessageDestroy,
connectFlags);
return wrapper.handlerId;
}
extern(C) static void callBackMessage(GstBus* busStruct, GstMessage* message, OnMessageDelegateWrapper wrapper)
{
wrapper.dlg(ObjectG.getDObject!(Message)(message), wrapper.outer);
}
extern(C) static void callBackMessageDestroy(OnMessageDelegateWrapper wrapper, GClosure* closure)
{
wrapper.remove(wrapper);
}
protected class OnSyncMessageDelegateWrapper
{
void delegate(Message, Bus) dlg;
gulong handlerId;
this(void delegate(Message, Bus) dlg)
{
this.dlg = dlg;
onSyncMessageListeners ~= this;
}
void remove(OnSyncMessageDelegateWrapper source)
{
foreach(index, wrapper; onSyncMessageListeners)
{
if (wrapper.handlerId == source.handlerId)
{
onSyncMessageListeners[index] = null;
onSyncMessageListeners = std.algorithm.remove(onSyncMessageListeners, index);
break;
}
}
}
}
OnSyncMessageDelegateWrapper[] onSyncMessageListeners;
/**
* A message has been posted on the bus. This signal is emitted from the
* thread that posted the message so one has to be careful with locking.
*
* This signal will not be emitted by default, you have to call
* gst_bus_enable_sync_message_emission() before.
*
* Params:
* message = the message that has been posted synchronously
*/
gulong addOnSyncMessage(void delegate(Message, Bus) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
{
auto wrapper = new OnSyncMessageDelegateWrapper(dlg);
wrapper.handlerId = Signals.connectData(
this,
"sync-message",
cast(GCallback)&callBackSyncMessage,
cast(void*)wrapper,
cast(GClosureNotify)&callBackSyncMessageDestroy,
connectFlags);
return wrapper.handlerId;
}
extern(C) static void callBackSyncMessage(GstBus* busStruct, GstMessage* message, OnSyncMessageDelegateWrapper wrapper)
{
wrapper.dlg(ObjectG.getDObject!(Message)(message), wrapper.outer);
}
extern(C) static void callBackSyncMessageDestroy(OnSyncMessageDelegateWrapper wrapper, GClosure* closure)
{
wrapper.remove(wrapper);
}
}
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