gstreamer/libs/gst/controller/gsttriggercontrolsource.c
2012-01-09 13:15:34 +00:00

256 lines
7.1 KiB
C

/* GStreamer
*
* Copyright (C) 2007,2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* 2011 Stefan Sauer <ensonic@users.sf.net>
*
* gsttriggercontrolsource.c: Control source that provides some values at time-
* stamps
*
* 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.
*/
/**
* SECTION:gsttriggercontrolsource
* @short_description: interpolation control source
*
* #GstTriggerControlSource is a #GstControlSource, that returns values from user-given
* control points. It allows for a tolerance on the time-stamps.
*
* To use #GstTriggerControlSource get a new instance by calling
* gst_trigger_control_source_new(), bind it to a #GParamSpec and set some
* control points by calling gst_timed_value_control_source_set().
*
* All functions are MT-safe.
*/
#include <glib-object.h>
#include <gst/gst.h>
#include "gsttriggercontrolsource.h"
#include "gst/glib-compat-private.h"
#include "gst/math-compat.h"
#define GST_CAT_DEFAULT controller_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
struct _GstTriggerControlSourcePrivate
{
gint64 tolerance;
};
/* control point accessors */
/* returns the default value of the property, except for times with specific values */
/* needed for one-shot events, such as notes and triggers */
static inline gdouble
_interpolate_trigger (GstTimedValueControlSource * self, GSequenceIter * iter,
GstClockTime timestamp)
{
GstControlPoint *cp;
gint64 tolerance = ((GstTriggerControlSource *) self)->priv->tolerance;
gboolean found = FALSE;
cp = g_sequence_get (iter);
if (GST_CLOCK_DIFF (cp->timestamp, timestamp) <= tolerance) {
found = TRUE;
} else {
if ((iter = g_sequence_iter_next (iter))) {
cp = g_sequence_get (iter);
if (GST_CLOCK_DIFF (timestamp, cp->timestamp) <= tolerance) {
found = TRUE;
}
}
}
if (found) {
return cp->value;
}
return NAN;
}
static gboolean
interpolate_trigger_get (GstTimedValueControlSource * self,
GstClockTime timestamp, gdouble * value)
{
gboolean ret = FALSE;
GSequenceIter *iter;
g_mutex_lock (self->lock);
iter =
gst_timed_value_control_source_find_control_point_iter (self, timestamp);
if (iter) {
*value = _interpolate_trigger (self, iter, timestamp);
if (!isnan (*value))
ret = TRUE;
}
g_mutex_unlock (self->lock);
return ret;
}
static gboolean
interpolate_trigger_get_value_array (GstTimedValueControlSource * self,
GstClockTime timestamp, GstClockTime interval, guint n_values,
gdouble * values)
{
gboolean ret = FALSE;
guint i;
GstClockTime ts = timestamp;
GstClockTime next_ts = 0;
gdouble val;
GSequenceIter *iter1 = NULL, *iter2 = NULL;
gboolean triggered = FALSE;
g_mutex_lock (self->lock);
for (i = 0; i < n_values; i++) {
val = NAN;
if (ts >= next_ts) {
iter1 = gst_timed_value_control_source_find_control_point_iter (self, ts);
if (!iter1) {
if (G_LIKELY (self->values))
iter2 = g_sequence_get_begin_iter (self->values);
else
iter2 = NULL;
} else {
iter2 = g_sequence_iter_next (iter1);
}
if (iter2 && !g_sequence_iter_is_end (iter2)) {
GstControlPoint *cp;
cp = g_sequence_get (iter2);
next_ts = cp->timestamp;
} else {
next_ts = GST_CLOCK_TIME_NONE;
}
if (iter1) {
val = _interpolate_trigger (self, iter1, ts);
if (!isnan (val))
ret = TRUE;
} else {
g_mutex_unlock (self->lock);
return FALSE;
}
triggered = TRUE;
} else if (triggered) {
if (iter1) {
val = _interpolate_trigger (self, iter1, ts);
if (!isnan (val))
ret = TRUE;
} else {
g_mutex_unlock (self->lock);
return FALSE;
}
triggered = FALSE;
}
*values = val;
ts += interval;
values++;
}
g_mutex_unlock (self->lock);
return ret;
}
enum
{
PROP_TOLERANCE = 1,
};
#define _do_init \
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "trigger control source", 0, \
"timeline value trigger control source")
G_DEFINE_TYPE_WITH_CODE (GstTriggerControlSource, gst_trigger_control_source,
GST_TYPE_TIMED_VALUE_CONTROL_SOURCE, _do_init);
/**
* gst_trigger_control_source_new:
*
* This returns a new, unbound #GstTriggerControlSource.
*
* Returns: a new, unbound #GstTriggerControlSource.
*/
GstTriggerControlSource *
gst_trigger_control_source_new (void)
{
return g_object_newv (GST_TYPE_TRIGGER_CONTROL_SOURCE, 0, NULL);
}
static void
gst_trigger_control_source_init (GstTriggerControlSource * self)
{
GstControlSource *csource = (GstControlSource *) self;
self->priv =
G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_TRIGGER_CONTROL_SOURCE,
GstTriggerControlSourcePrivate);
csource->get_value = (GstControlSourceGetValue) interpolate_trigger_get;
csource->get_value_array = (GstControlSourceGetValueArray)
interpolate_trigger_get_value_array;
}
static void
gst_trigger_control_source_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTriggerControlSource *self = GST_TRIGGER_CONTROL_SOURCE (object);
switch (prop_id) {
case PROP_TOLERANCE:
GST_TIMED_VALUE_CONTROL_SOURCE_LOCK (self);
self->priv->tolerance = g_value_get_int64 (value);
GST_TIMED_VALUE_CONTROL_SOURCE_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_trigger_control_source_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTriggerControlSource *self = GST_TRIGGER_CONTROL_SOURCE (object);
switch (prop_id) {
case PROP_TOLERANCE:
g_value_set_int64 (value, self->priv->tolerance);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_trigger_control_source_class_init (GstTriggerControlSourceClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstTriggerControlSourcePrivate));
gobject_class->set_property = gst_trigger_control_source_set_property;
gobject_class->get_property = gst_trigger_control_source_get_property;
g_object_class_install_property (gobject_class, PROP_TOLERANCE,
g_param_spec_int64 ("tolerance", "Tolerance",
"Amount of ns a control time can be off to still trigger",
0, G_MAXINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}