gstreamer/gst/gstevent.c
Wim Taymans a599a5b1df Created an overridable method for seeking on an element, along with a default implementation.
Original commit message from CVS:
Created an overridable method for seeking on an element, along with a default
implementation.
make queue flush on discont (not entirely correct)
removed the new_media from the discont event.
2002-05-30 19:03:30 +00:00

220 lines
4.8 KiB
C

/* 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 "gst/gstinfo.h"
#include "gst/gstevent.h"
#include <string.h> /* memcpy */
/* #define MEMPROF */
GType _gst_event_type;
static GMemChunk *_gst_event_chunk;
static GMutex *_gst_event_chunk_lock;
void
_gst_event_initialize (void)
{
gint eventsize = sizeof(GstEvent);
static const GTypeInfo event_info = {
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
NULL,
};
/* round up to the nearest 32 bytes for cache-line and other efficiencies */
eventsize = (((eventsize-1) / 32) + 1) * 32;
_gst_event_chunk = g_mem_chunk_new ("GstEvent", eventsize,
eventsize * 32, G_ALLOC_AND_FREE);
_gst_event_chunk_lock = g_mutex_new ();
/* register the type */
_gst_event_type = g_type_register_static (G_TYPE_INT, "GstEvent", &event_info, 0);
}
/**
* 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;
#ifndef MEMPROF
g_mutex_lock (_gst_event_chunk_lock);
event = g_mem_chunk_alloc (_gst_event_chunk);
g_mutex_unlock (_gst_event_chunk_lock);
#else
event = g_new0(GstEvent, 1);
#endif
GST_INFO (GST_CAT_EVENT, "creating new event %p", event);
GST_DATA_TYPE (event) = _gst_event_type;
GST_EVENT_TYPE (event) = type;
GST_EVENT_TIMESTAMP (event) = 0LL;
GST_EVENT_SRC (event) = NULL;
return event;
}
/**
* gst_event_copy:
* @event: The event to copy
*
* Copy the event
*
* Returns: A copy of the event.
*/
GstEvent*
gst_event_copy (GstEvent *event)
{
GstEvent *copy;
#ifndef MEMPROF
g_mutex_lock (_gst_event_chunk_lock);
copy = g_mem_chunk_alloc (_gst_event_chunk);
g_mutex_unlock (_gst_event_chunk_lock);
#else
copy = g_new0(GstEvent, 1);
#endif
memcpy (copy, event, sizeof (GstEvent));
/* FIXME copy/ref additional fields */
return copy;
}
/**
* gst_event_free:
* @event: The event to free
*
* Free the given element.
*/
void
gst_event_free (GstEvent* event)
{
GST_INFO (GST_CAT_EVENT, "freeing event %p", event);
g_mutex_lock (_gst_event_chunk_lock);
if (GST_EVENT_SRC (event)) {
gst_object_unref (GST_EVENT_SRC (event));
}
switch (GST_EVENT_TYPE (event)) {
default:
break;
}
#ifndef MEMPROF
g_mem_chunk_free (_gst_event_chunk, event);
#else
g_free (event);
#endif
g_mutex_unlock (_gst_event_chunk_lock);
}
/**
* gst_event_new_seek:
* @type: The type of the seek event
* @offset: The offset of the seek
* @flush: A boolean indicating a flush has to be performed as well
*
* 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;
return event;
}
GstEvent*
gst_event_new_discontinuous (gboolean flush, GstSeekType format1, ...)
{
va_list var_args;
GstEvent *event;
gint count = 0;
event = gst_event_new (GST_EVENT_DISCONTINUOUS);
GST_EVENT_DISCONT_FLUSH (event) = flush;
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;
}
gboolean
gst_event_discont_get_value (GstEvent *event, GstSeekType type, gint64 *value)
{
gint i, n;
g_return_val_if_fail (event, FALSE);
g_return_val_if_fail (value, FALSE);
n = GST_EVENT_DISCONT_OFFSET_LEN (event);
for (i = 0; i < n; i++) {
if (GST_EVENT_DISCONT_OFFSET(event,i).format == type) {
*value = GST_EVENT_DISCONT_OFFSET(event,i).value;
return TRUE;
}
}
return FALSE;
}