gstreamer/gst/gstvalue.c
David Schleef 91b0389731 hacking. Add value_compare, value_union, and value_intersect functions
Original commit message from CVS:
hacking.  Add value_compare, value_union, and value_intersect functions
2003-11-04 19:00:54 +00:00

469 lines
11 KiB
C

/* GStreamer
* Copyright (C) <2003> David A. Schleef <ds@schleef.org>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gobject/gvaluecollector.h>
typedef struct _GstValueCompareInfo GstValueCompareInfo;
struct _GstValueCompareInfo {
GType type;
GstValueCompareFunc func;
};
typedef struct _GstValueUnionInfo GstValueUnionInfo;
struct _GstValueUnionInfo {
GType type1;
GType type2;
GstValueUnionFunc func;
};
typedef struct _GstValueIntersectInfo GstValueIntersectInfo;
struct _GstValueIntersectInfo {
GType type1;
GType type2;
GstValueIntersectFunc func;
};
GType gst_type_fourcc;
GType gst_type_int_range;
GType gst_type_double_range;
GArray *gst_value_compare_funcs;
GArray *gst_value_union_funcs;
GArray *gst_value_intersect_funcs;
static void
gst_value_init_fourcc (GValue *value)
{
value->data[0].v_long = 0;
}
static void
gst_value_copy_fourcc (const GValue *src_value, GValue *dest_value)
{
dest_value->data[0].v_long = src_value->data[0].v_long;
}
static gchar *
gst_value_collect_fourcc (GValue *value, guint n_collect_values,
GTypeCValue *collect_values, guint collect_flags)
{
value->data[0].v_long = collect_values[0].v_long;
return NULL;
}
static gchar *
gst_value_lcopy_fourcc (const GValue *value, guint n_collect_values,
GTypeCValue *collect_values, guint collect_flags)
{
guint32 *fourcc_p = collect_values[0].v_pointer;
if (!fourcc_p)
return g_strdup_printf ("value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*fourcc_p = value->data[0].v_long;
return NULL;
}
void
gst_value_set_fourcc (GValue *value, guint32 fourcc)
{
g_return_if_fail (GST_VALUE_HOLDS_FOURCC (value));
value->data[0].v_long = fourcc;
}
guint32
gst_value_get_fourcc (const GValue *value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_FOURCC (value), 0);
return value->data[0].v_long;
}
/* int range */
static void
gst_value_init_int_range (GValue *value)
{
value->data[0].v_long = 0;
}
static void
gst_value_copy_int_range (const GValue *src_value, GValue *dest_value)
{
dest_value->data[0].v_long = src_value->data[0].v_long;
}
static gchar *
gst_value_collect_int_range (GValue *value, guint n_collect_values,
GTypeCValue *collect_values, guint collect_flags)
{
value->data[0].v_long = collect_values[0].v_long;
return NULL;
}
static gchar *
gst_value_lcopy_int_range (const GValue *value, guint n_collect_values,
GTypeCValue *collect_values, guint collect_flags)
{
guint32 *int_range_p = collect_values[0].v_pointer;
if (!int_range_p)
return g_strdup_printf ("value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*int_range_p = value->data[0].v_long;
return NULL;
}
void
gst_value_set_int_range (GValue *value, int start, int end)
{
g_return_if_fail (GST_VALUE_HOLDS_FOURCC (value));
value->data[0].v_long = start;
value->data[1].v_long = end;
}
int
gst_value_get_int_range_min (const GValue *value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_FOURCC (value), 0);
return value->data[0].v_long;
}
int
gst_value_get_int_range_max (const GValue *value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_FOURCC (value), 0);
return value->data[1].v_long;
}
static void
gst_value_transform_fourcc_string (const GValue *src_value,
GValue *dest_value)
{
dest_value->data[0].v_pointer = g_strdup_printf(GST_FOURCC_FORMAT,
GST_FOURCC_ARGS(src_value->data[0].v_long));
}
static void
gst_value_transform_int_range_string (const GValue *src_value,
GValue *dest_value)
{
dest_value->data[0].v_pointer = g_strdup_printf("[%d,%d]",
(int)src_value->data[0].v_long, (int)src_value->data[1].v_long);
}
/* comparison functions */
static int
gst_value_compare_int (const GValue *value1, const GValue *value2)
{
return value2->data[0].v_int - value1->data[0].v_int;
}
static int
gst_value_compare_double (const GValue *value1, const GValue *value2)
{
return (value2->data[0].v_double > value1->data[0].v_double) -
(value2->data[0].v_double < value1->data[0].v_double);
}
static int
gst_value_compare_string (const GValue *value1, const GValue *value2)
{
return strcmp(value1->data[0].v_pointer, value2->data[0].v_pointer);
}
static int
gst_value_compare_fourcc (const GValue *value1, const GValue *value2)
{
return value2->data[0].v_int - value1->data[0].v_int;
}
gboolean
gst_value_can_compare (const GValue *value1, const GValue *value2)
{
GstValueCompareInfo *compare_info;
int i;
if(G_VALUE_TYPE(value1) != G_VALUE_TYPE(value2))return FALSE;
for(i=0;i<gst_value_compare_funcs->len;i++){
compare_info = &g_array_index(gst_value_compare_funcs,
GstValueCompareInfo, i);
if(compare_info->type == G_VALUE_TYPE(value1)) return TRUE;
}
return FALSE;
}
int
gst_value_compare (const GValue *value1, const GValue *value2)
{
GstValueCompareInfo *compare_info;
int i;
g_return_val_if_fail(G_VALUE_TYPE(value1) == G_VALUE_TYPE(value2), 0);
for(i=0;i<gst_value_compare_funcs->len;i++){
compare_info = &g_array_index(gst_value_compare_funcs,
GstValueCompareInfo, i);
if(compare_info->type != G_VALUE_TYPE(value1)) continue;
return compare_info->func(value1, value2);
}
g_return_val_if_fail(0 /* type not found */, 0);
return 0;
}
void
gst_value_register_compare_func (GType type, GstValueCompareFunc func)
{
GstValueCompareInfo compare_info;
compare_info.type = type;
compare_info.func = func;
g_array_append_val(gst_value_compare_funcs, compare_info);
}
/* union */
gboolean
gst_value_can_union (const GValue *value1, const GValue *value2)
{
GstValueUnionInfo *union_info;
int i;
for(i=0;i<gst_value_union_funcs->len;i++){
union_info = &g_array_index(gst_value_union_funcs, GstValueUnionInfo, i);
if(union_info->type1 == G_VALUE_TYPE(value1) &&
union_info->type2 == G_VALUE_TYPE(value2)) return TRUE;
}
return FALSE;
}
void
gst_value_union (GValue *dest, const GValue *value1, const GValue *value2)
{
GstValueUnionInfo *union_info;
int i;
for(i=0;i<gst_value_union_funcs->len;i++){
union_info = &g_array_index(gst_value_union_funcs, GstValueUnionInfo, i);
if(union_info->type1 == G_VALUE_TYPE(value1) &&
union_info->type2 == G_VALUE_TYPE(value2)) {
union_info->func(dest, value1, value2);
return;
}
}
}
void
gst_value_register_union_func (GType type1, GType type2, GstValueUnionFunc func)
{
GstValueUnionInfo union_info;
union_info.type1 = type1;
union_info.type2 = type2;
union_info.func = func;
g_array_append_val(gst_value_union_funcs, union_info);
}
/* intersection */
static gboolean
gst_value_intersect_int_int_range (GValue *dest, const GValue *src1,
const GValue *src2)
{
g_return_val_if_fail(G_VALUE_TYPE(src1) == G_TYPE_INT, FALSE);
g_return_val_if_fail(G_VALUE_TYPE(src2) == GST_TYPE_INT_RANGE, FALSE);
if (src2->data[0].v_long <= src1->data[0].v_int &&
src2->data[1].v_long >= src1->data[0].v_int){
g_value_copy(src1, dest);
return TRUE;
}
return FALSE;
}
static gboolean
gst_value_intersect_int_range_int_range (GValue *dest, const GValue *src1,
const GValue *src2)
{
int min;
int max;
g_return_val_if_fail(G_VALUE_TYPE(src1) == GST_TYPE_INT_RANGE, FALSE);
g_return_val_if_fail(G_VALUE_TYPE(src2) == GST_TYPE_INT_RANGE, FALSE);
min = MAX(src1->data[0].v_long, src2->data[0].v_long);
max = MIN(src1->data[1].v_long, src2->data[1].v_long);
if(min < max){
g_value_init(dest, GST_TYPE_INT_RANGE);
gst_value_set_int_range(dest, min, max);
return TRUE;
}
if(min == max){
g_value_init(dest, G_TYPE_INT);
g_value_set_int(dest, min);
return TRUE;
}
return FALSE;
}
gboolean
gst_value_can_intersect (const GValue *value1, const GValue *value2)
{
GstValueIntersectInfo *intersect_info;
int i;
for(i=0;i<gst_value_intersect_funcs->len;i++){
intersect_info = &g_array_index(gst_value_intersect_funcs,
GstValueIntersectInfo, i);
if(intersect_info->type1 == G_VALUE_TYPE(value1) &&
intersect_info->type2 == G_VALUE_TYPE(value2)) return TRUE;
}
return FALSE;
}
void
gst_value_intersect (GValue *dest, const GValue *value1, const GValue *value2)
{
GstValueIntersectInfo *intersect_info;
int i;
for(i=0;i<gst_value_intersect_funcs->len;i++){
intersect_info = &g_array_index(gst_value_intersect_funcs,
GstValueIntersectInfo, i);
if(intersect_info->type1 == G_VALUE_TYPE(value1) &&
intersect_info->type2 == G_VALUE_TYPE(value2)) {
intersect_info->func(dest, value1, value2);
return;
}
}
}
void
gst_value_register_intersect_func (GType type1, GType type2,
GstValueIntersectFunc func)
{
GstValueIntersectInfo intersect_info;
intersect_info.type1 = type1;
intersect_info.type2 = type2;
intersect_info.func = func;
g_array_append_val(gst_value_intersect_funcs, intersect_info);
}
void
_gst_value_initialize (void)
{
GTypeInfo info = {
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
NULL,
};
//const GTypeFundamentalInfo finfo = { G_TYPE_FLAG_DERIVABLE, };
{
static const GTypeValueTable value_table = {
gst_value_init_fourcc,
NULL,
gst_value_copy_fourcc,
NULL,
"i",
gst_value_collect_fourcc,
"p",
gst_value_lcopy_fourcc
};
info.value_table = &value_table;
gst_type_fourcc = g_type_register_static (G_TYPE_BOXED, "GstFourcc", &info, 0);
}
{
static const GTypeValueTable value_table = {
gst_value_init_int_range,
NULL,
gst_value_copy_int_range,
NULL,
"i",
gst_value_collect_int_range,
"p",
gst_value_lcopy_int_range
};
info.value_table = &value_table;
gst_type_int_range = g_type_register_static (G_TYPE_BOXED, "GstIntRange", &info, 0);
}
g_value_register_transform_func (GST_TYPE_FOURCC, G_TYPE_STRING,
gst_value_transform_fourcc_string);
g_value_register_transform_func (GST_TYPE_INT_RANGE, G_TYPE_STRING,
gst_value_transform_int_range_string);
gst_value_compare_funcs = g_array_new(FALSE, FALSE,
sizeof(GstValueCompareInfo));
gst_value_register_compare_func (G_TYPE_INT, gst_value_compare_int);
gst_value_register_compare_func (G_TYPE_DOUBLE, gst_value_compare_double);
gst_value_register_compare_func (G_TYPE_STRING, gst_value_compare_string);
gst_value_register_compare_func (GST_TYPE_FOURCC, gst_value_compare_fourcc);
gst_value_union_funcs = g_array_new(FALSE, FALSE,
sizeof(GstValueUnionInfo));
gst_value_intersect_funcs = g_array_new(FALSE, FALSE,
sizeof(GstValueIntersectInfo));
gst_value_register_intersect_func (G_TYPE_INT, GST_TYPE_INT_RANGE,
gst_value_intersect_int_int_range);
gst_value_register_intersect_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE,
gst_value_intersect_int_range_int_range);
}