gstreamer/libs/gst/controller/gstinterpolation.c

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/* GStreamer
*
* Copyright (C) <2005> Stefan Kost <ensonic at users dot sf dot net>
*
* gstinterpolation.c: Interpolation methods for dynamic properties
*
* 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 "config.h"
#include "gstcontroller.h"
#define GST_CAT_DEFAULT gst_controller_debug
GST_DEBUG_CATEGORY_EXTERN (GST_CAT_DEFAULT);
/* common helper */
/*
* gst_controlled_property_find_timed_value_node:
* @prop: the controlled property to search in
* @timestamp: the search key
*
* Find last value before given timestamp in timed value list.
*
* Returns: the found #GList node or %NULL
*/
GList *
gst_controlled_property_find_timed_value_node (GstControlledProperty * prop,
GstClockTime timestamp)
{
/* GList *prev_node = NULL; */
GList *prev_node = g_list_last (prop->values);
GList *node;
GstTimedValue *tv;
/*
if((prop->last_value) &&
(timestamp>((GstTimedValue *)(prop->last_value->data))->timestamp)) {
node=prop->last_value;
}
else {
node=prop->values;
}
*/
/* iterate over timed value list */
for (node = prop->values; node; node = g_list_next (node)) {
tv = node->data;
/* this timestamp is newer that the one we look for */
if (timestamp < tv->timestamp) {
/* get previous one again */
prev_node = g_list_previous (node);
break;
}
}
/*
if(node) {
prop->last_value=prev_node;
}
*/
return (prev_node);
}
/* steps-like (no-)interpolation, default */
/* just returns the value for the most recent key-frame */
static GValue *
interpolate_none_get (GstControlledProperty * prop, GstClockTime timestamp)
{
GList *node;
if ((node = gst_controlled_property_find_timed_value_node (prop, timestamp))) {
GstTimedValue *tv = node->data;
return (&tv->value);
}
return (&prop->default_value);
}
#define DEFINE_NONE_GET(type) \
static gboolean \
interpolate_none_get_##type##_value_array (GstControlledProperty * prop, \
GstClockTime timestamp, GstValueArray * value_array) \
{ \
gint i; \
GstClockTime ts=timestamp; \
g##type *values=(g##type *)value_array->values; \
\
for(i=0;i<value_array->nbsamples;i++) { \
*values=g_value_get_##type (interpolate_none_get (prop,ts)); \
ts+=value_array->sample_interval; \
values++; \
} \
return (TRUE); \
}
DEFINE_NONE_GET (int)
DEFINE_NONE_GET (long)
DEFINE_NONE_GET (float)
DEFINE_NONE_GET (double)
DEFINE_NONE_GET (boolean)
static GstInterpolateMethod interpolate_none = {
interpolate_none_get,
interpolate_none_get_int_value_array,
interpolate_none_get,
interpolate_none_get_long_value_array,
interpolate_none_get,
interpolate_none_get_float_value_array,
interpolate_none_get,
interpolate_none_get_double_value_array,
interpolate_none_get,
interpolate_none_get_boolean_value_array
};
/* returns the default value of the property, except for times with specific values */
/* needed for one-shot events, such as notes and triggers */
static GValue *
interpolate_trigger_get (GstControlledProperty * prop, GstClockTime timestamp)
{
GList *node;
GstTimedValue *tv;
/* check if there is a value at the registered timestamp */
for (node = prop->values; node; node = g_list_next (node)) {
tv = node->data;
if (timestamp == tv->timestamp) {
return (&tv->value);
}
}
return (&prop->default_value);
}
static gboolean
interpolate_trigger_get_value_array (GstControlledProperty * prop,
GstClockTime timestamp, GstValueArray * value_array)
{
return (FALSE);
}
static GstInterpolateMethod interpolate_trigger = {
interpolate_trigger_get,
interpolate_trigger_get_value_array,
interpolate_trigger_get,
NULL,
interpolate_trigger_get,
NULL,
interpolate_trigger_get,
NULL,
interpolate_trigger_get,
NULL
};
/* linear interpolation */
/* smoothes inbetween values */
#define DEFINE_LINEAR_GET(type) \
static g##type \
_interpolate_linear_get_##type (GstControlledProperty * prop, GstClockTime timestamp) \
{ \
GList *node; \
\
if ((node = gst_controlled_property_find_timed_value_node (prop, timestamp))) { \
GstTimedValue *tv1, *tv2; \
\
tv1 = node->data; \
if ((node = g_list_next (node))) { \
gdouble timediff,valuediff; \
g##type value1,value2; \
\
tv2 = node->data; \
\
timediff = (gdouble)(tv2->timestamp - tv1->timestamp); \
value1 = g_value_get_##type (&tv1->value); \
value2 = g_value_get_##type (&tv2->value); \
valuediff = (gdouble)(value2-value1); \
\
return((g##type)(value1+valuediff*((timestamp-tv1->timestamp)/timediff))); \
} \
else { \
return (g_value_get_##type (&tv1->value)); \
} \
} \
return (g_value_get_##type (&prop->default_value)); \
} \
\
static GValue * \
interpolate_linear_get_##type (GstControlledProperty * prop, GstClockTime timestamp) \
{ \
g_value_set_##type (&prop->result_value,_interpolate_linear_get_##type (prop,timestamp)); \
return (&prop->result_value); \
} \
\
static gboolean \
interpolate_linear_get_##type##_value_array (GstControlledProperty * prop, \
GstClockTime timestamp, GstValueArray * value_array) \
{ \
gint i; \
GstClockTime ts=timestamp; \
gint *values=(gint *)value_array->values; \
\
for(i=0;i<value_array->nbsamples;i++) { \
*values=_interpolate_linear_get_##type (prop,ts); \
ts+=value_array->sample_interval; \
values++; \
} \
return (TRUE); \
}
DEFINE_LINEAR_GET (int)
DEFINE_LINEAR_GET (long)
DEFINE_LINEAR_GET (float)
DEFINE_LINEAR_GET (double)
static GstInterpolateMethod interpolate_linear = {
interpolate_linear_get_int,
interpolate_linear_get_int_value_array,
interpolate_linear_get_long,
interpolate_linear_get_long_value_array,
interpolate_linear_get_float,
interpolate_linear_get_float_value_array,
interpolate_linear_get_double,
interpolate_linear_get_double_value_array,
NULL,
NULL
};
/* square interpolation */
/* cubic interpolation */
/* register all interpolation methods */
GstInterpolateMethod *interpolation_methods[] = {
&interpolate_none,
&interpolate_trigger,
&interpolate_linear,
NULL,
NULL
};