gstreamer/libs/gst/control/dparam_smooth.c

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/* GStreamer
* Copyright (C) 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
*
* gstdparam_smooth.c: Realtime smoothed dynamic parameter
*
* 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 <math.h>
#include <string.h>
#include <gst/gstinfo.h>
#include <gst/control/dparam_smooth.h>
#include <gst/control/dparammanager.h>
static void gst_dpsmooth_class_init (GstDParamSmoothClass *klass);
static void gst_dpsmooth_init (GstDParamSmooth *dparam);
static void gst_dpsmooth_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_dpsmooth_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static gint64 gst_dpsmooth_time_since_last_update(GstDParam *dparam, gint64 timestamp);
static void gst_dpsmooth_do_update_float (GstDParam *dparam, gint64 timestamp, GValue *value);
enum {
ARG_0,
ARG_UPDATE_PERIOD,
ARG_SLOPE_TIME,
ARG_SLOPE_DELTA_FLOAT,
ARG_SLOPE_DELTA_INT,
ARG_SLOPE_DELTA_INT64,
};
GType
gst_dpsmooth_get_type(void) {
static GType dpsmooth_type = 0;
if (!dpsmooth_type) {
static const GTypeInfo dpsmooth_info = {
sizeof(GstDParamSmoothClass),
NULL,
NULL,
(GClassInitFunc)gst_dpsmooth_class_init,
NULL,
NULL,
sizeof(GstDParamSmooth),
0,
(GInstanceInitFunc)gst_dpsmooth_init,
};
dpsmooth_type = g_type_register_static(GST_TYPE_DPARAM, "GstDParamSmooth", &dpsmooth_info, 0);
}
return dpsmooth_type;
}
static void
gst_dpsmooth_class_init (GstDParamSmoothClass *klass)
{
GObjectClass *gobject_class;
GstDParamSmoothClass *dpsmooth_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass*)klass;
dpsmooth_class = (GstDParamSmoothClass*)klass;
gstobject_class = (GstObjectClass*) klass;
gobject_class->get_property = gst_dpsmooth_get_property;
gobject_class->set_property = gst_dpsmooth_set_property;
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_UPDATE_PERIOD,
g_param_spec_int64("update_period",
"Update Period (nanoseconds)",
"Number of nanoseconds between updates",
0LL, G_MAXINT64, 2000000LL, G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SLOPE_TIME,
g_param_spec_int64("slope_time",
"Slope Time (nanoseconds)",
"The time period to define slope_delta by",
0LL, G_MAXINT64, 10000000LL, G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SLOPE_DELTA_FLOAT,
g_param_spec_float("slope_delta_float",
"Slope Delta float",
"The amount a float value can change for a given slope_time",
0.0F, G_MAXFLOAT, 0.2F, G_PARAM_READWRITE));
/*gstobject_class->save_thyself = gst_dparam_save_thyself; */
}
static void
gst_dpsmooth_init (GstDParamSmooth *dpsmooth)
{
g_return_if_fail (dpsmooth != NULL);
}
/**
* gst_dpsmooth_new:
* @type: the type that this dparam will store
*
* Returns: a new instance of GstDParam
*/
GstDParam*
gst_dpsmooth_new (GType type)
{
GstDParam *dparam;
GstDParamSmooth *dpsmooth;
dpsmooth =g_object_new (gst_dpsmooth_get_type (), NULL);
dparam = GST_DPARAM(dpsmooth);
GST_DPARAM_TYPE(dparam) = type;
switch (type){
case G_TYPE_FLOAT: {
dparam->do_update_func = gst_dpsmooth_do_update_float;
break;
}
default:
/* we don't support this type here */
dparam->do_update_func = gst_dparam_do_update_default;
break;
}
dpsmooth->last_update_timestamp = 0LL;
return dparam;
}
static void
gst_dpsmooth_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstDParam *dparam;
GstDParamSmooth *dpsmooth;
g_return_if_fail(GST_IS_DPSMOOTH(object));
dpsmooth = GST_DPSMOOTH(object);
dparam = GST_DPARAM(object);
GST_DPARAM_LOCK(dparam);
switch (prop_id) {
case ARG_UPDATE_PERIOD:
dpsmooth->update_period = g_value_get_int64 (value);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
break;
case ARG_SLOPE_TIME:
dpsmooth->slope_time = g_value_get_int64 (value);
GST_DEBUG(GST_CAT_PARAMS, "dpsmooth->slope_time:%lld",dpsmooth->slope_time);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
break;
case ARG_SLOPE_DELTA_FLOAT:
dpsmooth->slope_delta_float = g_value_get_float (value);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
break;
default:
break;
}
GST_DPARAM_UNLOCK(dparam);
}
static void
gst_dpsmooth_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstDParam *dparam;
GstDParamSmooth *dpsmooth;
g_return_if_fail(GST_IS_DPSMOOTH(object));
dpsmooth = GST_DPSMOOTH(object);
dparam = GST_DPARAM(object);
switch (prop_id) {
case ARG_UPDATE_PERIOD:
g_value_set_int64(value, dpsmooth->update_period);
break;
case ARG_SLOPE_TIME:
g_value_set_int64(value, dpsmooth->slope_time);
break;
case ARG_SLOPE_DELTA_FLOAT:
g_value_set_float (value, dpsmooth->slope_delta_float);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gint64
gst_dpsmooth_time_since_last_update(GstDParam *dparam, gint64 timestamp)
{
gint64 time_diff, last_update_diff, num_update_periods;
GstDParamSmooth *dpsmooth = GST_DPSMOOTH(dparam);
last_update_diff = timestamp - dpsmooth->last_update_timestamp;
time_diff = MIN(dpsmooth->update_period, last_update_diff);
GST_DEBUG(GST_CAT_PARAMS, "last_update_diff:%lld",last_update_diff);
GST_DEBUG(GST_CAT_PARAMS, "time_diff:%lld",time_diff);
dpsmooth->last_update_timestamp = GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam);
if(GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) <= timestamp && dpsmooth->update_period > 0LL){
GST_DEBUG(GST_CAT_PARAMS, "dpsmooth->update_period:%lld",dpsmooth->update_period);
num_update_periods = last_update_diff / dpsmooth->update_period;
GST_DEBUG(GST_CAT_PARAMS, "num_update_periods:%lld",num_update_periods);
GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = dpsmooth->update_period * (num_update_periods + 1LL);
}
GST_DEBUG(GST_CAT_PARAMS, "last:%lld current:%lld next:%lld",
dpsmooth->last_update_timestamp, timestamp, GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam));
return time_diff;
}
static void
gst_dpsmooth_do_update_float (GstDParam *dparam, gint64 timestamp, GValue *value)
{
gint64 time_diff;
gfloat time_ratio;
gfloat current, target, max_change, final_val;
gfloat current_diff = 0;
GstDParamSmooth *dpsmooth = GST_DPSMOOTH(dparam);
GST_DPARAM_LOCK(dparam);
time_diff = gst_dpsmooth_time_since_last_update(dparam, timestamp);
target = dparam->value_float;
current = g_value_get_float(value);
time_ratio = (gfloat)time_diff / (gfloat)dpsmooth->slope_time;
max_change = time_ratio * dpsmooth->slope_delta_float;
GST_DEBUG(GST_CAT_PARAMS, "target:%f current:%f max_change:%f ",
target, current, max_change);
if (GST_DPARAM_IS_LOG(dparam)){
if (current == 0.0F){
/* this shouldn't happen, so forget about smoothing and just set the value */
final_val = target;
GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
}
else {
gfloat current_log;
current_log = log(current);
current_diff = ABS(current_log - log(target));
GST_DEBUG(GST_CAT_PARAMS, "current_log:%f",current_log);
GST_DEBUG(GST_CAT_PARAMS, "current_diff:%f",current_diff);
if (current_diff > max_change)
final_val = (target < current) ? exp(current_log-max_change) : exp(current_log+max_change);
else
final_val = target;
GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
}
}
else {
current_diff = ABS (current - target);
if (current_diff > max_change)
final_val = (target < current) ? current-max_change : current+max_change;
else
final_val = target;
GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
}
GST_DPARAM_READY_FOR_UPDATE(dparam) = (current_diff > max_change);
g_value_set_float(value, final_val);
GST_DEBUG(GST_CAT_PARAMS, "target:%f current:%f final:%f actual:%f", target, current, final_val, g_value_get_float(value));
GST_DPARAM_UNLOCK(dparam);
}