gstreamer/gst/gstevent.c

262 lines
5.9 KiB
C
Raw Normal View History

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstevent.h: Header for GstEvent 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.
*/
#include <string.h> /* memcpy */
#include "gstinfo.h"
#include "gstdata_private.h"
#include "gstevent.h"
#include "gstlog.h"
/* #define MEMPROF */
GType _gst_event_type;
static gint _gst_event_live;
void
_gst_event_initialize (void)
{
/* register the type */
_gst_event_type = g_boxed_type_register_static ("GstEvent",
(GBoxedCopyFunc) gst_data_ref,
(GBoxedFreeFunc) gst_data_unref);
_gst_event_live = 0;
}
/**
* gst_event_print_stats:
*
* Logs statistics about live events (using g_log).
*/
void
gst_event_print_stats (void)
{
g_log (g_log_domain_gstreamer, G_LOG_LEVEL_INFO,
"%d live event(s)", _gst_event_live);
}
static GstEvent*
_gst_event_copy (GstEvent *event)
{
GstEvent *copy;
copy = g_new0(GstEvent, 1);
_gst_event_live++;
memcpy (copy, event, sizeof (GstEvent));
/* FIXME copy/ref additional fields */
return copy;
}
static void
_gst_event_free (GstEvent* event)
{
GST_INFO (GST_CAT_EVENT, "freeing event %p", event);
if (GST_EVENT_SRC (event)) {
gst_object_unref (GST_EVENT_SRC (event));
}
switch (GST_EVENT_TYPE (event)) {
default:
break;
}
_GST_DATA_DISPOSE (GST_DATA (event));
_gst_event_live--;
g_free (event);
}
/**
* gst_event_new:
* @type: The type of the new event
*
* Allocate a new event of the given type.
*
* Returns: A new event.
*/
GstEvent*
gst_event_new (GstEventType type)
{
GstEvent *event;
event = g_new0(GstEvent, 1);
_gst_event_live++;
GST_INFO (GST_CAT_EVENT, "creating new event %p", event);
_GST_DATA_INIT (GST_DATA (event),
_gst_event_type,
0,
(GstDataFreeFunction) _gst_event_free,
(GstDataCopyFunction) _gst_event_copy);
GST_EVENT_TYPE (event) = type;
GST_EVENT_TIMESTAMP (event) = 0LL;
GST_EVENT_SRC (event) = NULL;
return event;
}
/**
* gst_event_new_seek:
* @type: The type of the seek event
* @offset: The offset of the seek
*
* Allocate a new seek event with the given parameters.
*
* Returns: A new seek event.
*/
GstEvent*
gst_event_new_seek (GstSeekType type, gint64 offset)
{
GstEvent *event;
event = gst_event_new (GST_EVENT_SEEK);
GST_EVENT_SEEK_TYPE (event) = type;
GST_EVENT_SEEK_OFFSET (event) = offset;
GST_EVENT_SEEK_ENDOFFSET (event) = -1;
return event;
}
/**
* gst_event_new_discontinuous:
* @new_media: A flag indicating a new media type starts
* @format1: The format of the discont value
* @...: more discont values and formats
*
* Allocate a new discontinuous event with the geven format/value pairs.
*
* Returns: A new discontinuous event.
*/
GstEvent*
gst_event_new_discontinuous (gboolean new_media, GstFormat format1, ...)
{
va_list var_args;
GstEvent *event;
gint count = 0;
event = gst_event_new (GST_EVENT_DISCONTINUOUS);
GST_EVENT_DISCONT_NEW_MEDIA (event) = new_media;
va_start (var_args, format1);
while (format1) {
GST_EVENT_DISCONT_OFFSET (event, count).format = format1 & GST_SEEK_FORMAT_MASK;
GST_EVENT_DISCONT_OFFSET (event, count).value = va_arg (var_args, gint64);
format1 = va_arg (var_args, GstSeekType);
count++;
}
va_end (var_args);
GST_EVENT_DISCONT_OFFSET_LEN (event) = count;
return event;
}
/**
* gst_event_discont_get_value:
* @event: The event to query
* @format: The format of the discont value
* @value: A pointer to the value
*
* Get the value for the given format in the dicont event.
*
* Returns: TRUE if the discont event caries the specified format/value pair.
*/
gboolean
gst_event_discont_get_value (GstEvent *event, GstFormat format, gint64 *value)
{
gint i, n;
g_return_val_if_fail (event != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
n = GST_EVENT_DISCONT_OFFSET_LEN (event);
for (i = 0; i < n; i++) {
if (GST_EVENT_DISCONT_OFFSET(event,i).format == format) {
*value = GST_EVENT_DISCONT_OFFSET(event,i).value;
return TRUE;
}
}
return FALSE;
}
/**
* gst_event_new_size:
* @format: The format of the size value
* @value: The value of the size event
*
* Create a new size event with the given values.
*
* Returns: The new size event.
*/
GstEvent*
gst_event_new_size (GstFormat format, gint64 value)
{
GstEvent *event;
event = gst_event_new (GST_EVENT_SIZE);
GST_EVENT_SIZE_FORMAT (event) = format;
GST_EVENT_SIZE_VALUE (event) = value;
return event;
}
/**
* gst_event_new_segment_seek:
* @type: The type of the seek event
* @start: The start offset of the seek
* @stop: The stop offset of the seek
*
* Allocate a new segment seek event with the given parameters.
*
* Returns: A new segment seek event.
*/
GstEvent*
gst_event_new_segment_seek (GstSeekType type, gint64 start, gint64 stop)
{
GstEvent *event;
g_return_val_if_fail (start < stop, NULL);
event = gst_event_new (GST_EVENT_SEEK_SEGMENT);
GST_EVENT_SEEK_TYPE (event) = type;
GST_EVENT_SEEK_OFFSET (event) = start;
GST_EVENT_SEEK_ENDOFFSET (event) = stop;
return event;
}