gstreamer/libs/gst/controller/gst-interpolation.c
Stefan Kost c32233b7fc added controller code removed dparam pc files
Original commit message from CVS:
added controller code
removed dparam pc files
2005-08-02 21:35:34 +00:00

231 lines
5.8 KiB
C

/*
* gst-interpolation.h
*
* Interpolation methodws for dynamic properties
*/
#include "config.h"
#include "gst-controller.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)
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
};
// 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
};
// 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,
};
// square interpolation
// cubic interpolation
// register all interpolation methods
GstInterpolateMethod *interpolation_methods[] = {
&interpolate_none,
&interpolate_trigger,
&interpolate_linear,
NULL,
NULL
};