gstreamer/gst/gstprobe.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstprobe.h: Header for GstProbe object
*
* 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_private.h"
#include "gstprobe.h"
/**
* gst_probe_new:
* @single_shot: TRUE if a single shot probe is required
* @callback: the function to call when the probe is triggered
* @user_data: data passed to the callback function
*
* Create a new probe with the specified parameters. The single shot
* probe will be fired only once. It is the responsability of the
* application to free the single probe after it has been fired.
*
* Returns: a new #GstProbe.
*/
GstProbe *
gst_probe_new (gboolean single_shot,
GstProbeCallback callback, gpointer user_data)
{
GstProbe *probe;
g_return_val_if_fail (callback, NULL);
probe = g_new0 (GstProbe, 1);
probe->single_shot = single_shot;
probe->callback = callback;
probe->user_data = user_data;
return probe;
}
/**
* gst_probe_destroy:
* @probe: The probe to destroy
*
* Free the memeory associated with the probe.
*/
void
gst_probe_destroy (GstProbe * probe)
{
g_return_if_fail (probe);
#ifdef USE_POISONING
memset (probe, 0xff, sizeof (*probe));
#endif
g_free (probe);
}
/**
* gst_probe_perform:
* @probe: The probe to trigger
* @data: the GstData that triggered the probe.
*
* Perform the callback associated with the given probe.
*
* Returns: the result of the probe callback function.
*/
gboolean
gst_probe_perform (GstProbe * probe, GstData ** data)
{
gboolean res = TRUE;
g_return_val_if_fail (probe, res);
if (probe->callback)
res = probe->callback (probe, data, probe->user_data);
return res;
}
/**
* gst_probe_dispatcher_new:
*
* Create a new probe dispatcher
*
* Returns: a new probe dispatcher.
*/
GstProbeDispatcher *
gst_probe_dispatcher_new (void)
{
GstProbeDispatcher *disp;
disp = g_new0 (GstProbeDispatcher, 1);
gst_probe_dispatcher_init (disp);
return disp;
}
/**
* gst_probe_dispatcher_destroy:
* @disp: the dispatcher to destroy
*
* Free the memory allocated by the probe dispatcher. All pending
* probes are removed first.
*/
void
gst_probe_dispatcher_destroy (GstProbeDispatcher * disp)
{
g_return_if_fail (disp);
#ifdef USE_POISONING
memset (disp, 0xff, sizeof (*disp));
#endif
/* FIXME, free pending probes */
g_free (disp);
}
/**
* gst_probe_dispatcher_init:
* @disp: the dispatcher to initialize
*
* Initialize the dispatcher. Useful for statically allocated probe
* dispatchers.
*/
void
gst_probe_dispatcher_init (GstProbeDispatcher * disp)
{
g_return_if_fail (disp);
disp->active = TRUE;
disp->probes = NULL;
}
/**
* gst_probe_dispatcher_set_active:
* @disp: the dispatcher to activate
* @active: boolean to indicate activation or deactivation
*
* Activate or deactivate the given dispatcher
* dispatchers.
*/
void
gst_probe_dispatcher_set_active (GstProbeDispatcher * disp, gboolean active)
{
g_return_if_fail (disp);
disp->active = active;
}
/**
* gst_probe_dispatcher_add_probe:
* @disp: the dispatcher to add the probe to
* @probe: the probe to add to the dispatcher
*
* Adds the given probe to the dispatcher.
*/
void
gst_probe_dispatcher_add_probe (GstProbeDispatcher * disp, GstProbe * probe)
{
g_return_if_fail (disp);
g_return_if_fail (probe);
disp->probes = g_slist_prepend (disp->probes, probe);
}
/**
* gst_probe_dispatcher_remove_probe:
* @disp: the dispatcher to remove the probe from
* @probe: the probe to remove from the dispatcher
*
* Removes the given probe from the dispatcher.
*/
void
gst_probe_dispatcher_remove_probe (GstProbeDispatcher * disp, GstProbe * probe)
{
g_return_if_fail (disp);
g_return_if_fail (probe);
disp->probes = g_slist_remove (disp->probes, probe);
}
/**
* gst_probe_dispatcher_dispatch:
* @disp: the dispatcher to dispatch
* @data: the data that triggered the dispatch
*
* Trigger all registered probes on the given dispatcher.
*
* Returns: TRUE if all callbacks returned TRUE.
*/
gboolean
gst_probe_dispatcher_dispatch (GstProbeDispatcher * disp, GstData ** data)
{
GSList *walk;
gboolean res = TRUE;
g_return_val_if_fail (disp, res);
walk = disp->probes;
while (walk) {
GstProbe *probe = (GstProbe *) walk->data;
walk = g_slist_next (walk);
res &= gst_probe_perform (probe, data);
if (probe->single_shot) {
disp->probes = g_slist_remove (disp->probes, probe);
/* do not free the probe here as it cannot be made threadsafe */
//gst_probe_destroy (probe);
}
}
return res;
}