gstreamer/gst/gstmessage.h

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/* GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* gstmessage.h: Header for GstMessage 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_MESSAGE_H__
#define __GST_MESSAGE_H__
#include <gst/gsttypes.h>
#include <gst/gstdata.h>
#include <gst/gstobject.h>
#include <gst/gsttag.h>
#include <gst/gststructure.h>
G_BEGIN_DECLS
GST_EXPORT GType _gst_message_type;
/**
* GstMessageType:
* @GST_MESSAGE_UNKNOWN: an undefined message
* @GST_MESSAGE_EOS: end-of-stream reached in a pipeline
* @GST_MESSAGE_ERROR: an error occured
* @GST_MESSAGE_WARNING: a warning occured.
* @GST_MESSAGE_INFO: an info message occured
* @GST_MESSAGE_TAG: a tag was found.
* @GST_MESSAGE_BUFFERING: the pipeline is buffering
* @GST_MESSAGE_STATE_CHANGED: a state change happened
* @GST_MESSAGE_STEP_DONE: a framestep finished.
* @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline
* @GST_MESSAGE_STRUCTURE_CHANGE: the structure of the pipeline changed.
* @GST_MESSAGE_STREAM_STATUS: status about a stream, emited when it starts,
* stops, errors, etc..
* @GST_MESSAGE_APPLICATION: message posted by the application, possibly
* via an application-specific element.
* @GST_MESSAGE_ANY: mask for all of the above messages.
*/
typedef enum
{
GST_MESSAGE_UNKNOWN = 0,
GST_MESSAGE_EOS = (1 << 0),
GST_MESSAGE_ERROR = (1 << 1),
GST_MESSAGE_WARNING = (1 << 2),
GST_MESSAGE_INFO = (1 << 3),
GST_MESSAGE_TAG = (1 << 4),
GST_MESSAGE_BUFFERING = (1 << 5),
GST_MESSAGE_STATE_CHANGED = (1 << 6),
GST_MESSAGE_STEP_DONE = (1 << 7),
GST_MESSAGE_NEW_CLOCK = (1 << 8),
GST_MESSAGE_STRUCTURE_CHANGE = (1 << 9),
GST_MESSAGE_STREAM_STATUS = (1 << 10),
GST_MESSAGE_APPLICATION = (1 << 11),
GST_MESSAGE_ANY = 0xffffffff
} GstMessageType;
#define GST_MESSAGE_TRACE_NAME "GstMessage"
#define GST_TYPE_MESSAGE (_gst_message_type)
#define GST_MESSAGE(message) ((GstMessage*)(message))
#define GST_IS_MESSAGE(message) (GST_DATA_TYPE(message) == GST_TYPE_MESSAGE)
/* the lock is used to handle the synchronous handling of messages,
* the emiting thread is block until the handling thread processed
* the message using this mutex/cond pair */
#define GST_MESSAGE_GET_LOCK(message) (GST_MESSAGE(message)->lock)
#define GST_MESSAGE_LOCK(message) g_mutex_lock(GST_MESSAGE_GET_LOCK(message))
#define GST_MESSAGE_UNLOCK(message) g_mutex_unlock(GST_MESSAGE_GET_LOCK(message))
#define GST_MESSAGE_COND(message) (GST_MESSAGE(message)->cond)
#define GST_MESSAGE_WAIT(message) g_cond_wait(GST_MESSAGE_COND(message),GST_MESSAGE_GET_LOCK(message))
#define GST_MESSAGE_SIGNAL(message) g_cond_signal(GST_MESSAGE_COND(message))
#define GST_MESSAGE_TYPE(message) (GST_MESSAGE(message)->type)
#define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE(message)->timestamp)
#define GST_MESSAGE_SRC(message) (GST_MESSAGE(message)->src)
struct _GstMessage
{
GstData data;
/*< public > *//* with MESSAGE_LOCK */
GMutex *lock; /* lock and cond for async delivery */
GCond *cond;
/*< public > *//* with COW */
GstMessageType type;
guint64 timestamp;
GstObject *src;
GstStructure *structure;
/*< private > */
gpointer _gst_reserved[GST_PADDING];
};
void _gst_message_initialize (void);
GType gst_message_get_type (void);
GstMessage * gst_message_new (GstMessageType type, GstObject * src);
/* refcounting */
#define gst_message_ref(msg) GST_MESSAGE (gst_data_ref (GST_DATA (msg)))
#define gst_message_ref_by_count(msg,c) GST_MESSAGE (gst_data_ref_by_count (GST_DATA (msg), (c)))
#define gst_message_unref(msg) gst_data_unref (GST_DATA (msg))
/* copy message */
#define gst_message_copy(msg) GST_MESSAGE (gst_data_copy (GST_DATA (msg)))
#define gst_message_copy_on_write(msg) GST_MESSAGE (gst_data_copy_on_write (GST_DATA (msg)))
GstMessage * gst_message_new_eos (GstObject * src);
GstMessage * gst_message_new_error (GstObject * src, GError * error, gchar * debug);
GstMessage * gst_message_new_warning (GstObject * src, GError * error, gchar * debug);
GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list);
GstMessage * gst_message_new_state_changed (GstObject * src, GstElementState old_state,
GstElementState new_state);
GstMessage * gst_message_new_application (GstStructure *structure);
void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug);
void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug);
void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list);
void gst_message_parse_state_changed (GstMessage *message, GstElementState *old_state,
GstElementState *new_state);
const GstStructure * gst_message_get_structure (GstMessage *message);
G_END_DECLS
#endif /* __GST_MESSAGE_H__ */