gstreamer/gst/gstbus.h
Andy Wingo 1a5201826c gst/gstmessage.h (GstMessageType): Turned into flags. Added
Original commit message from CVS:
2005-02-21  Andy Wingo  <wingo@pobox.com>

* gst/gstmessage.h (GstMessageType): Turned into flags. Added
GST_MESSAGE_ANY as an OR of all flags.
(GST_MESSAGE_PARSE_STATE_CHANGED): New terrible macro. Will be
made into a function soon.
(GstMessage): Add a state_changed structure to the union. The
union will die soon in favor of a single GstStructure tho.
(gst_message_new_state_changed): New API.

* gst/gstmessage.c (gst_message_new_state_changed): New API.

* tools/gst-launch.c (check_intr): Set the state of the pipeline
to PAUSED here; the poll will catch the state change.
(event_loop): New function, polls the pipeline bus for events. Can
block until eos/error/state change, or just handle the pending
events.
(main): Changed to use event_loop instead of running a main loop.

* gst/gstbus.h (gst_bus_poll): Added.
(gst_bus_peek): Return non-const; the message is refcounted
anyway.

* gst/gstbus.c (gst_bus_init): Replace the GAsyncQueue with a
GQueue+mutex to allow for _peek. (The wake-up functionality
provided by GAsyncQueue is already done by our socketpair.) All
queue users changed to lock, operate, and unlock.
(gst_bus_post): Check the retval of write(2) and handle errno.
(gst_bus_peek): Implemented.
(gst_bus_pop, gst_bus_peek, bus_callback): Because the socketpair
is used to wake up the GSource, read off the character in the
GSource handler and not in pop/peek. This is because a peek will
require a pop in the future, and you can't read off the char
twice. Deal with errno in the read.
(bus_callback): Interpret the handler return value as whether or
not to pop the message from the bus.
(poll_handler, poll_timeout, gst_bus_poll): New API. gst_bus_poll
is meant to replace the while(gst_bin_iterate()) idiom.
2005-02-21 11:54:55 +00:00

103 lines
3.3 KiB
C

/* GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* gstbus.h: Header for GstBus subsystem
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_BUS_H__
#define __GST_BUS_H__
#include <gst/gsttypes.h>
#include <gst/gstmessage.h>
#include <gst/gstclock.h>
G_BEGIN_DECLS
/* --- standard type macros --- */
#define GST_TYPE_BUS (gst_bus_get_type ())
#define GST_BUS(bus) (G_TYPE_CHECK_INSTANCE_CAST ((bus), GST_TYPE_BUS, GstBus))
#define GST_IS_BUS(bus) (G_TYPE_CHECK_INSTANCE_TYPE ((bus), GST_TYPE_BUS))
#define GST_BUS_CLASS(bclass) (G_TYPE_CHECK_CLASS_CAST ((bclass), GST_TYPE_BUS, GstBusClass))
#define GST_IS_BUS_CLASS(bclass) (G_TYPE_CHECK_CLASS_TYPE ((bclass), GST_TYPE_BUS))
#define GST_BUS_GET_CLASS(bus) (G_TYPE_INSTANCE_GET_CLASS ((bus), GST_TYPE_BUS, GstBusClass))
#define GST_BUS_CAST(bus) ((GstBus*)(bus))
typedef enum
{
GST_BUS_DROP = 0, /* drop message */
GST_BUS_PASS = 1, /* pass message to async queue */
GST_BUS_ASYNC = 2, /* pass message to async queue, continue if message is handled */
} GstBusSyncReply;
typedef GstBusSyncReply (*GstBusSyncHandler) (GstBus * bus, GstMessage * message, gpointer data);
typedef gboolean (*GstBusHandler) (GstBus * bus, GstMessage * message, gpointer data);
struct _GstBus
{
GstObject object;
/*< private > */
GQueue *queue;
GMutex *queue_lock;
GstBusSyncHandler sync_handler;
gpointer sync_handler_data;
gint control_socket[2];
GIOChannel *io_channel;
/*< private > */
gpointer _gst_reserved[GST_PADDING];
};
struct _GstBusClass
{
GstObjectClass parent_class;
/*< private > */
gpointer _gst_reserved[GST_PADDING];
};
GType gst_bus_get_type (void);
GstBus* gst_bus_new (void);
gboolean gst_bus_post (GstBus * bus, GstMessage * message);
gboolean gst_bus_have_pending (GstBus * bus);
GstMessage * gst_bus_peek (GstBus * bus);
GstMessage * gst_bus_pop (GstBus * bus);
void gst_bus_set_sync_handler (GstBus * bus, GstBusSyncHandler func,
gpointer data);
GSource * gst_bus_create_watch (GstBus * bus);
guint gst_bus_add_watch_full (GstBus * bus,
gint priority,
GstBusHandler handler,
gpointer user_data,
GDestroyNotify notify);
guint gst_bus_add_watch (GstBus * bus,
GstBusHandler handler,
gpointer user_data);
GstMessageType gst_bus_poll (GstBus *bus, GstMessageType events,
GstClockTimeDiff timeout);
G_END_DECLS
#endif /* __GST_BUS_H__ */