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1a5201826c
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.
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/* GStreamer
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
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*
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* gstbus.h: Header for GstBus subsystem
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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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#ifndef __GST_BUS_H__
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#define __GST_BUS_H__
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#include <gst/gsttypes.h>
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#include <gst/gstmessage.h>
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#include <gst/gstclock.h>
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G_BEGIN_DECLS
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/* --- standard type macros --- */
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#define GST_TYPE_BUS (gst_bus_get_type ())
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#define GST_BUS(bus) (G_TYPE_CHECK_INSTANCE_CAST ((bus), GST_TYPE_BUS, GstBus))
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#define GST_IS_BUS(bus) (G_TYPE_CHECK_INSTANCE_TYPE ((bus), GST_TYPE_BUS))
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#define GST_BUS_CLASS(bclass) (G_TYPE_CHECK_CLASS_CAST ((bclass), GST_TYPE_BUS, GstBusClass))
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#define GST_IS_BUS_CLASS(bclass) (G_TYPE_CHECK_CLASS_TYPE ((bclass), GST_TYPE_BUS))
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#define GST_BUS_GET_CLASS(bus) (G_TYPE_INSTANCE_GET_CLASS ((bus), GST_TYPE_BUS, GstBusClass))
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#define GST_BUS_CAST(bus) ((GstBus*)(bus))
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typedef enum
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{
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GST_BUS_DROP = 0, /* drop message */
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GST_BUS_PASS = 1, /* pass message to async queue */
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GST_BUS_ASYNC = 2, /* pass message to async queue, continue if message is handled */
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} GstBusSyncReply;
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typedef GstBusSyncReply (*GstBusSyncHandler) (GstBus * bus, GstMessage * message, gpointer data);
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typedef gboolean (*GstBusHandler) (GstBus * bus, GstMessage * message, gpointer data);
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struct _GstBus
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{
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GstObject object;
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/*< private > */
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GQueue *queue;
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GMutex *queue_lock;
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GstBusSyncHandler sync_handler;
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gpointer sync_handler_data;
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gint control_socket[2];
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GIOChannel *io_channel;
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/*< private > */
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstBusClass
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{
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GstObjectClass parent_class;
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/*< private > */
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_bus_get_type (void);
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GstBus* gst_bus_new (void);
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gboolean gst_bus_post (GstBus * bus, GstMessage * message);
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gboolean gst_bus_have_pending (GstBus * bus);
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GstMessage * gst_bus_peek (GstBus * bus);
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GstMessage * gst_bus_pop (GstBus * bus);
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void gst_bus_set_sync_handler (GstBus * bus, GstBusSyncHandler func,
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gpointer data);
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GSource * gst_bus_create_watch (GstBus * bus);
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guint gst_bus_add_watch_full (GstBus * bus,
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gint priority,
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GstBusHandler handler,
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gpointer user_data,
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GDestroyNotify notify);
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guint gst_bus_add_watch (GstBus * bus,
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GstBusHandler handler,
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gpointer user_data);
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GstMessageType gst_bus_poll (GstBus *bus, GstMessageType events,
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GstClockTimeDiff timeout);
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G_END_DECLS
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#endif /* __GST_BUS_H__ */
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