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gstreamer/gst/gstvalue.c
Thomas Vander Stichele f74399ea55 fix docs 
Original commit message from CVS:
fix docs
2005-09-23 16:35:43 +00:00

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/* 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.
*/
/**
* SECTION:gstvalue
* @short_description: GValue implementations specific to GStreamer
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "gst_private.h"
#include <gst/gst.h>
#include <gobject/gvaluecollector.h>
typedef struct _GstValueUnionInfo GstValueUnionInfo;
struct _GstValueUnionInfo
{
GType type1;
GType type2;
GstValueUnionFunc func;
};
typedef struct _GstValueIntersectInfo GstValueIntersectInfo;
struct _GstValueIntersectInfo
{
GType type1;
GType type2;
GstValueIntersectFunc func;
};
typedef struct _GstValueSubtractInfo GstValueSubtractInfo;
struct _GstValueSubtractInfo
{
GType minuend;
GType subtrahend;
GstValueSubtractFunc func;
};
GType gst_type_fourcc;
GType gst_type_int_range;
GType gst_type_double_range;
GType gst_type_list;
GType gst_type_array;
GType gst_type_fraction;
GType gst_type_date;
static GArray *gst_value_table;
static GArray *gst_value_union_funcs;
static GArray *gst_value_intersect_funcs;
static GArray *gst_value_subtract_funcs;
/********
* list *
********/
/* two helper functions to serialize/stringify any type of list
* regular lists are done with { }, arrays with < >
*/
static char *
gst_value_serialize_any_list (const GValue * value, const char *begin,
const char *end)
{
int i;
GArray *array = value->data[0].v_pointer;
GString *s;
GValue *v;
gchar *s_val;
s = g_string_new (begin);
for (i = 0; i < array->len; i++) {
v = &g_array_index (array, GValue, i);
s_val = gst_value_serialize (v);
g_string_append (s, s_val);
g_free (s_val);
if (i < array->len - 1) {
g_string_append (s, ", ");
}
}
g_string_append (s, end);
return g_string_free (s, FALSE);
}
static void
gst_value_transform_any_list_string (const GValue * src_value,
GValue * dest_value, const char *begin, const char *end)
{
GValue *list_value;
GArray *array;
GString *s;
int i;
char *list_s;
array = src_value->data[0].v_pointer;
s = g_string_new (begin);
for (i = 0; i < array->len; i++) {
list_value = &g_array_index (array, GValue, i);
if (i != 0) {
g_string_append (s, ", ");
}
list_s = g_strdup_value_contents (list_value);
g_string_append (s, list_s);
g_free (list_s);
}
g_string_append (s, end);
dest_value->data[0].v_pointer = g_string_free (s, FALSE);
}
/*
* helper function to see if a type is fixed. Is used internally here and
* there. Do not export, since it doesn't work for types where the content
* decides the fixedness (e.g. GST_TYPE_ARRAY).
*/
static gboolean
gst_type_is_fixed (GType type)
{
if (type == GST_TYPE_INT_RANGE || type == GST_TYPE_DOUBLE_RANGE ||
type == GST_TYPE_LIST) {
return FALSE;
}
if (G_TYPE_FUNDAMENTAL (type) <=
G_TYPE_MAKE_FUNDAMENTAL (G_TYPE_RESERVED_GLIB_LAST)) {
return TRUE;
}
if (type == GST_TYPE_BUFFER || type == GST_TYPE_FOURCC
|| type == GST_TYPE_ARRAY || type == GST_TYPE_FRACTION) {
return TRUE;
}
return FALSE;
}
/* GValue functions usable for both regular lists and arrays */
static void
gst_value_init_list (GValue * value)
{
value->data[0].v_pointer = g_array_new (FALSE, TRUE, sizeof (GValue));
}
static GArray *
gst_value_list_array_copy (const GArray * src)
{
GArray *dest;
gint i;
dest = g_array_sized_new (FALSE, TRUE, sizeof (GValue), src->len);
g_array_set_size (dest, src->len);
for (i = 0; i < src->len; i++) {
gst_value_init_and_copy (&g_array_index (dest, GValue, i),
&g_array_index (src, GValue, i));
}
return dest;
}
static void
gst_value_copy_list (const GValue * src_value, GValue * dest_value)
{
dest_value->data[0].v_pointer =
gst_value_list_array_copy ((GArray *) src_value->data[0].v_pointer);
}
static void
gst_value_free_list (GValue * value)
{
gint i;
GArray *src = (GArray *) value->data[0].v_pointer;
if ((value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS) == 0) {
for (i = 0; i < src->len; i++) {
g_value_unset (&g_array_index (src, GValue, i));
}
g_array_free (src, TRUE);
}
}
static gpointer
gst_value_list_peek_pointer (const GValue * value)
{
return value->data[0].v_pointer;
}
static gchar *
gst_value_collect_list (GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
if (collect_flags & G_VALUE_NOCOPY_CONTENTS) {
value->data[0].v_pointer = collect_values[0].v_pointer;
value->data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
} else {
value->data[0].v_pointer =
gst_value_list_array_copy ((GArray *) collect_values[0].v_pointer);
}
return NULL;
}
static gchar *
gst_value_lcopy_list (const GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
GArray **dest = collect_values[0].v_pointer;
if (!dest)
return g_strdup_printf ("value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
if (!value->data[0].v_pointer)
return g_strdup_printf ("invalid value given for `%s'",
G_VALUE_TYPE_NAME (value));
if (collect_flags & G_VALUE_NOCOPY_CONTENTS) {
*dest = (GArray *) value->data[0].v_pointer;
} else {
*dest = gst_value_list_array_copy ((GArray *) value->data[0].v_pointer);
}
return NULL;
}
/**
* gst_value_list_prepend_value:
* @value: a GstValueList to prepend a value to
* @prepend_value: the value to prepend
*
* Prepends @prepend_value to the GstValueList in @value.
*
*/
void
gst_value_list_prepend_value (GValue * value, const GValue * prepend_value)
{
GValue val = { 0, };
g_return_if_fail (GST_VALUE_HOLDS_LIST (value)
|| GST_VALUE_HOLDS_ARRAY (value));
gst_value_init_and_copy (&val, prepend_value);
g_array_prepend_vals ((GArray *) value->data[0].v_pointer, &val, 1);
}
/**
* gst_value_list_append_value:
* @value: a GstValueList to append a value to
* @append_value: the value to append
*
* Appends @append_value to the GstValueList in @value.
*/
void
gst_value_list_append_value (GValue * value, const GValue * append_value)
{
GValue val = { 0, };
g_return_if_fail (GST_VALUE_HOLDS_LIST (value)
|| GST_VALUE_HOLDS_ARRAY (value));
gst_value_init_and_copy (&val, append_value);
g_array_append_vals ((GArray *) value->data[0].v_pointer, &val, 1);
}
/**
* gst_value_list_get_size:
* @value: a #GValue of type #GST_LIST_TYPE or #GST_ARRAY_TYPE
*
* Gets the number of values contained in @value.
*
* Returns: the number of values
*/
guint
gst_value_list_get_size (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_LIST (value)
|| GST_VALUE_HOLDS_ARRAY (value), 0);
return ((GArray *) value->data[0].v_pointer)->len;
}
/**
* gst_value_list_get_value:
* @value: a #GValue of type #GST_LIST_TYPE or #GST_ARRAY_TYPE
* @index: index of value to get from the list
*
* Gets the value that is a member of the list contained in @value and
* has the index @index.
*
* Returns: the value at the given index
*/
const GValue *
gst_value_list_get_value (const GValue * value, guint index)
{
g_return_val_if_fail (GST_VALUE_HOLDS_LIST (value)
|| GST_VALUE_HOLDS_ARRAY (value), NULL);
g_return_val_if_fail (index < gst_value_list_get_size (value), NULL);
return (const GValue *) &g_array_index ((GArray *) value->data[0].v_pointer,
GValue, index);
}
/**
* gst_value_list_concat:
* @dest: an uninitialized #GValue to take the result
* @value1: first value to put into the union
* @value2: second value to put into the union
*
* Concatenates copies of value1 and value2 into a list. The value
* @dest is initialized to the type GST_TYPE_LIST.
*/
void
gst_value_list_concat (GValue * dest, const GValue * value1,
const GValue * value2)
{
guint i, value1_length, value2_length;
GArray *array;
g_return_if_fail (dest != NULL);
g_return_if_fail (G_VALUE_TYPE (dest) == 0);
g_return_if_fail (G_IS_VALUE (value1));
g_return_if_fail (G_IS_VALUE (value2));
value1_length =
(GST_VALUE_HOLDS_LIST (value1) ? gst_value_list_get_size (value1) : 1);
value2_length =
(GST_VALUE_HOLDS_LIST (value2) ? gst_value_list_get_size (value2) : 1);
g_value_init (dest, GST_TYPE_LIST);
array = (GArray *) dest->data[0].v_pointer;
g_array_set_size (array, value1_length + value2_length);
if (GST_VALUE_HOLDS_LIST (value1)) {
for (i = 0; i < value1_length; i++) {
gst_value_init_and_copy (&g_array_index (array, GValue, i),
gst_value_list_get_value (value1, i));
}
} else {
gst_value_init_and_copy (&g_array_index (array, GValue, 0), value1);
}
if (GST_VALUE_HOLDS_LIST (value2)) {
for (i = 0; i < value2_length; i++) {
gst_value_init_and_copy (&g_array_index (array, GValue,
i + value1_length), gst_value_list_get_value (value2, i));
}
} else {
gst_value_init_and_copy (&g_array_index (array, GValue, value1_length),
value2);
}
}
static void
gst_value_transform_list_string (const GValue * src_value, GValue * dest_value)
{
gst_value_transform_any_list_string (src_value, dest_value, "{ ", " }");
}
static void
gst_value_transform_array_string (const GValue * src_value, GValue * dest_value)
{
gst_value_transform_any_list_string (src_value, dest_value, "< ", " >");
}
static int
gst_value_compare_list (const GValue * value1, const GValue * value2)
{
int i, j;
GArray *array1 = value1->data[0].v_pointer;
GArray *array2 = value2->data[0].v_pointer;
GValue *v1;
GValue *v2;
if (array1->len != array2->len)
return GST_VALUE_UNORDERED;
for (i = 0; i < array1->len; i++) {
v1 = &g_array_index (array1, GValue, i);
for (j = 0; j < array1->len; j++) {
v2 = &g_array_index (array2, GValue, j);
if (gst_value_compare (v1, v2) == GST_VALUE_EQUAL)
break;
}
if (j == array1->len) {
return GST_VALUE_UNORDERED;
}
}
return GST_VALUE_EQUAL;
}
static char *
gst_value_serialize_list (const GValue * value)
{
return gst_value_serialize_any_list (value, "{ ", " }");
}
static gboolean
gst_value_deserialize_list (GValue * dest, const char *s)
{
g_warning ("unimplemented");
return FALSE;
}
static char *
gst_value_serialize_array (const GValue * value)
{
return gst_value_serialize_any_list (value, "< ", " >");
}
static gboolean
gst_value_deserialize_array (GValue * dest, const char *s)
{
g_warning ("unimplemented");
return FALSE;
}
/**********
* fourcc *
**********/
static void
gst_value_init_fourcc (GValue * value)
{
value->data[0].v_int = 0;
}
static void
gst_value_copy_fourcc (const GValue * src_value, GValue * dest_value)
{
dest_value->data[0].v_int = src_value->data[0].v_int;
}
static gchar *
gst_value_collect_fourcc (GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
value->data[0].v_int = collect_values[0].v_int;
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_int;
return NULL;
}
/**
* gst_value_set_fourcc:
* @value: a GValue initialized to #GST_TYPE_FOURCC
* @fourcc: the #guint32 fourcc to set
*
* Sets @value to @fourcc.
*/
void
gst_value_set_fourcc (GValue * value, guint32 fourcc)
{
g_return_if_fail (GST_VALUE_HOLDS_FOURCC (value));
value->data[0].v_int = fourcc;
}
/**
* gst_value_get_fourcc:
* @value: a GValue initialized to #GST_TYPE_FOURCC
*
* Gets the #guint32 fourcc contained in @value.
*
* Returns: the #guint32 fourcc contained in @value.
*/
guint32
gst_value_get_fourcc (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_FOURCC (value), 0);
return value->data[0].v_int;
}
static void
gst_value_transform_fourcc_string (const GValue * src_value,
GValue * dest_value)
{
guint32 fourcc = src_value->data[0].v_int;
if (g_ascii_isprint ((fourcc >> 0) & 0xff) &&
g_ascii_isprint ((fourcc >> 8) & 0xff) &&
g_ascii_isprint ((fourcc >> 16) & 0xff) &&
g_ascii_isprint ((fourcc >> 24) & 0xff)) {
dest_value->data[0].v_pointer =
g_strdup_printf (GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
} else {
dest_value->data[0].v_pointer = g_strdup_printf ("0x%08x", fourcc);
}
}
static int
gst_value_compare_fourcc (const GValue * value1, const GValue * value2)
{
if (value2->data[0].v_int == value1->data[0].v_int)
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_fourcc (const GValue * value)
{
guint32 fourcc = value->data[0].v_int;
if (g_ascii_isalnum ((fourcc >> 0) & 0xff) &&
g_ascii_isalnum ((fourcc >> 8) & 0xff) &&
g_ascii_isalnum ((fourcc >> 16) & 0xff) &&
g_ascii_isalnum ((fourcc >> 24) & 0xff)) {
return g_strdup_printf (GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
} else {
return g_strdup_printf ("0x%08x", fourcc);
}
}
static gboolean
gst_value_deserialize_fourcc (GValue * dest, const char *s)
{
gboolean ret = FALSE;
guint32 fourcc = 0;
char *end;
if (strlen (s) == 4) {
fourcc = GST_MAKE_FOURCC (s[0], s[1], s[2], s[3]);
ret = TRUE;
} else if (g_ascii_isdigit (*s)) {
fourcc = strtoul (s, &end, 0);
if (*end == 0) {
ret = TRUE;
}
}
gst_value_set_fourcc (dest, fourcc);
return ret;
}
/*************
* int range *
*************/
static void
gst_value_init_int_range (GValue * value)
{
value->data[0].v_int = 0;
value->data[1].v_int = 0;
}
static void
gst_value_copy_int_range (const GValue * src_value, GValue * dest_value)
{
dest_value->data[0].v_int = src_value->data[0].v_int;
dest_value->data[1].v_int = src_value->data[1].v_int;
}
static gchar *
gst_value_collect_int_range (GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
value->data[0].v_int = collect_values[0].v_int;
value->data[1].v_int = collect_values[1].v_int;
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_start = collect_values[0].v_pointer;
guint32 *int_range_end = collect_values[1].v_pointer;
if (!int_range_start)
return g_strdup_printf ("start value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
if (!int_range_end)
return g_strdup_printf ("end value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*int_range_start = value->data[0].v_int;
*int_range_end = value->data[1].v_int;
return NULL;
}
/**
* gst_value_set_int_range:
* @value: a GValue initialized to GST_TYPE_INT_RANGE
* @start: the start of the range
* @end: the end of the range
*
* Sets @value to the range specified by @start and @end.
*/
void
gst_value_set_int_range (GValue * value, int start, int end)
{
g_return_if_fail (GST_VALUE_HOLDS_INT_RANGE (value));
g_return_if_fail (start < end);
value->data[0].v_int = start;
value->data[1].v_int = end;
}
/**
* gst_value_get_int_range_min:
* @value: a GValue initialized to GST_TYPE_INT_RANGE
*
* Gets the minimum of the range specified by @value.
*
* Returns: the minimum of the range
*/
int
gst_value_get_int_range_min (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_INT_RANGE (value), 0);
return value->data[0].v_int;
}
/**
* gst_value_get_int_range_max:
* @value: a GValue initialized to GST_TYPE_INT_RANGE
*
* Gets the maximum of the range specified by @value.
*
* Returns: the maxumum of the range
*/
int
gst_value_get_int_range_max (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_INT_RANGE (value), 0);
return value->data[1].v_int;
}
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_int, (int) src_value->data[1].v_int);
}
static int
gst_value_compare_int_range (const GValue * value1, const GValue * value2)
{
if (value2->data[0].v_int == value1->data[0].v_int &&
value2->data[1].v_int == value1->data[1].v_int)
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_int_range (const GValue * value)
{
return g_strdup_printf ("[ %d, %d ]", value->data[0].v_int,
value->data[1].v_int);
}
static gboolean
gst_value_deserialize_int_range (GValue * dest, const char *s)
{
g_warning ("unimplemented");
return FALSE;
}
/****************
* double range *
****************/
static void
gst_value_init_double_range (GValue * value)
{
value->data[0].v_double = 0;
value->data[1].v_double = 0;
}
static void
gst_value_copy_double_range (const GValue * src_value, GValue * dest_value)
{
dest_value->data[0].v_double = src_value->data[0].v_double;
dest_value->data[1].v_double = src_value->data[1].v_double;
}
static gchar *
gst_value_collect_double_range (GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
value->data[0].v_double = collect_values[0].v_double;
value->data[1].v_double = collect_values[1].v_double;
return NULL;
}
static gchar *
gst_value_lcopy_double_range (const GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
gdouble *double_range_start = collect_values[0].v_pointer;
gdouble *double_range_end = collect_values[1].v_pointer;
if (!double_range_start)
return g_strdup_printf ("start value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
if (!double_range_end)
return g_strdup_printf ("end value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*double_range_start = value->data[0].v_double;
*double_range_end = value->data[1].v_double;
return NULL;
}
/**
* gst_value_set_double_range:
* @value: a GValue initialized to GST_TYPE_DOUBLE_RANGE
* @start: the start of the range
* @end: the end of the range
*
* Sets @value to the range specified by @start and @end.
*/
void
gst_value_set_double_range (GValue * value, double start, double end)
{
g_return_if_fail (GST_VALUE_HOLDS_DOUBLE_RANGE (value));
value->data[0].v_double = start;
value->data[1].v_double = end;
}
/**
* gst_value_get_double_range_min:
* @value: a GValue initialized to GST_TYPE_DOUBLE_RANGE
*
* Gets the minimum of the range specified by @value.
*
* Returns: the minumum of the range
*/
double
gst_value_get_double_range_min (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_DOUBLE_RANGE (value), 0);
return value->data[0].v_double;
}
/**
* gst_value_get_double_range_max:
* @value: a GValue initialized to GST_TYPE_DOUBLE_RANGE
*
* Gets the maximum of the range specified by @value.
*
* Returns: the maxumum of the range
*/
double
gst_value_get_double_range_max (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_DOUBLE_RANGE (value), 0);
return value->data[1].v_double;
}
static void
gst_value_transform_double_range_string (const GValue * src_value,
GValue * dest_value)
{
char s1[G_ASCII_DTOSTR_BUF_SIZE], s2[G_ASCII_DTOSTR_BUF_SIZE];
dest_value->data[0].v_pointer = g_strdup_printf ("[%s,%s]",
g_ascii_dtostr (s1, G_ASCII_DTOSTR_BUF_SIZE,
src_value->data[0].v_double),
g_ascii_dtostr (s2, G_ASCII_DTOSTR_BUF_SIZE,
src_value->data[1].v_double));
}
static int
gst_value_compare_double_range (const GValue * value1, const GValue * value2)
{
if (value2->data[0].v_double == value1->data[0].v_double &&
value2->data[0].v_double == value1->data[0].v_double)
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_double_range (const GValue * value)
{
char d1[G_ASCII_DTOSTR_BUF_SIZE];
char d2[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (d1, G_ASCII_DTOSTR_BUF_SIZE, value->data[0].v_double);
g_ascii_dtostr (d2, G_ASCII_DTOSTR_BUF_SIZE, value->data[1].v_double);
return g_strdup_printf ("[ %s, %s ]", d1, d2);
}
static gboolean
gst_value_deserialize_double_range (GValue * dest, const char *s)
{
g_warning ("unimplemented");
return FALSE;
}
/***********
* GstCaps *
***********/
/**
* gst_value_set_caps:
* @value: a GValue initialized to GST_TYPE_CAPS
* @caps: the caps to set the value to
*
* Sets the contents of @value to coorespond to @caps. The actual
* #GstCaps structure is copied before it is used.
*/
void
gst_value_set_caps (GValue * value, const GstCaps * caps)
{
g_return_if_fail (G_VALUE_TYPE (value) == GST_TYPE_CAPS);
g_value_set_boxed (value, caps);
}
/**
* gst_value_get_caps:
* @value: a GValue initialized to GST_TYPE_CAPS
*
* Gets the contents of @value.
*
* Returns: the contents of @value
*/
const GstCaps *
gst_value_get_caps (const GValue * value)
{
g_return_val_if_fail (G_VALUE_TYPE (value) == GST_TYPE_CAPS, NULL);
return (GstCaps *) g_value_get_boxed (value);
}
static char *
gst_value_serialize_caps (const GValue * value)
{
GstCaps *caps = g_value_get_boxed (value);
return gst_caps_to_string (caps);
}
static gboolean
gst_value_deserialize_caps (GValue * dest, const char *s)
{
GstCaps *caps;
caps = gst_caps_from_string (s);
if (caps) {
g_value_set_boxed (dest, caps);
return TRUE;
}
return FALSE;
}
/*************
* GstBuffer *
*************/
static int
gst_value_compare_buffer (const GValue * value1, const GValue * value2)
{
GstBuffer *buf1 = GST_BUFFER (gst_value_get_mini_object (value1));
GstBuffer *buf2 = GST_BUFFER (gst_value_get_mini_object (value2));
if (GST_BUFFER_SIZE (buf1) != GST_BUFFER_SIZE (buf2))
return GST_VALUE_UNORDERED;
if (GST_BUFFER_SIZE (buf1) == 0)
return GST_VALUE_EQUAL;
g_assert (GST_BUFFER_DATA (buf1));
g_assert (GST_BUFFER_DATA (buf2));
if (memcmp (GST_BUFFER_DATA (buf1), GST_BUFFER_DATA (buf2),
GST_BUFFER_SIZE (buf1)) == 0)
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_buffer (const GValue * value)
{
guint8 *data;
int i;
int size;
char *string;
GstBuffer *buffer = GST_BUFFER (gst_value_get_mini_object (value));
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
string = g_malloc (size * 2 + 1);
for (i = 0; i < size; i++) {
sprintf (string + i * 2, "%02x", data[i]);
}
string[size * 2] = 0;
return string;
}
static gboolean
gst_value_deserialize_buffer (GValue * dest, const char *s)
{
GstBuffer *buffer;
gboolean ret = TRUE;
int len;
char ts[3];
guint8 *data;
int i;
len = strlen (s);
if (len & 1)
return FALSE;
buffer = gst_buffer_new_and_alloc (len / 2);
data = GST_BUFFER_DATA (buffer);
for (i = 0; i < len / 2; i++) {
if (!isxdigit ((int) s[i * 2]) || !isxdigit ((int) s[i * 2 + 1])) {
ret = FALSE;
break;
}
ts[0] = s[i * 2 + 0];
ts[1] = s[i * 2 + 1];
ts[2] = 0;
data[i] = strtoul (ts, NULL, 16);
}
if (ret) {
gst_value_take_mini_object (dest, GST_MINI_OBJECT (buffer));
return TRUE;
} else {
gst_buffer_unref (buffer);
return FALSE;
}
}
/***********
* boolean *
***********/
static int
gst_value_compare_boolean (const GValue * value1, const GValue * value2)
{
if ((value1->data[0].v_int != 0) == (value2->data[0].v_int != 0))
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_boolean (const GValue * value)
{
if (value->data[0].v_int) {
return g_strdup ("true");
}
return g_strdup ("false");
}
static gboolean
gst_value_deserialize_boolean (GValue * dest, const char *s)
{
gboolean ret = FALSE;
if (g_ascii_strcasecmp (s, "true") == 0 ||
g_ascii_strcasecmp (s, "yes") == 0 ||
g_ascii_strcasecmp (s, "t") == 0 || strcmp (s, "1") == 0) {
g_value_set_boolean (dest, TRUE);
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "false") == 0 ||
g_ascii_strcasecmp (s, "no") == 0 ||
g_ascii_strcasecmp (s, "f") == 0 || strcmp (s, "0") == 0) {
g_value_set_boolean (dest, FALSE);
ret = TRUE;
}
return ret;
}
#define CREATE_SERIALIZATION_START(_type,_macro) \
static gint \
gst_value_compare_ ## _type \
(const GValue * value1, const GValue * value2) \
{ \
g ## _type val1 = g_value_get_ ## _type (value1); \
g ## _type val2 = g_value_get_ ## _type (value2); \
if (val1 > val2) \
return GST_VALUE_GREATER_THAN; \
if (val1 < val2) \
return GST_VALUE_LESS_THAN; \
return GST_VALUE_EQUAL; \
} \
\
static char * \
gst_value_serialize_ ## _type (const GValue * value) \
{ \
GValue val = { 0, }; \
g_value_init (&val, G_TYPE_STRING); \
if (!g_value_transform (value, &val)) \
g_assert_not_reached (); \
/* NO_COPY_MADNESS!!! */ \
return (char *) g_value_get_string (&val); \
}
/* deserialize the given s into to as a long long.
* check if the result is actually storeable in the given size number of
* bytes.
*/
static gboolean
gst_value_deserialize_int_helper (long long *to, const char *s,
long long min, long long max, int size)
{
gboolean ret = FALSE;
char *end;
long long mask = -1;
errno = 0;
*to = g_ascii_strtoull (s, &end, 0);
/* a range error is a definitive no-no */
if (errno == ERANGE) {
return FALSE;
}
if (*end == 0) {
ret = TRUE;
} else {
if (g_ascii_strcasecmp (s, "little_endian") == 0) {
*to = G_LITTLE_ENDIAN;
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "big_endian") == 0) {
*to = G_BIG_ENDIAN;
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "byte_order") == 0) {
*to = G_BYTE_ORDER;
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "min") == 0) {
*to = min;
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "max") == 0) {
*to = max;
ret = TRUE;
}
}
if (ret) {
/* by definition, a long long fits into a long long; so ignore those */
if (size != sizeof (mask)) {
if (*to >= 0) {
/* for positive numbers, we create a mask of 1's outside of the range
* and 0's inside the range. An and will thus keep only 1 bits
* outside of the range */
mask <<= (size * 8);
if ((mask & *to) != 0) {
ret = FALSE;
}
} else {
/* for negative numbers, we do a 2's complement version */
mask <<= ((size * 8) - 1);
if ((mask & *to) != mask) {
ret = FALSE;
}
}
}
}
return ret;
}
#define CREATE_SERIALIZATION(_type,_macro) \
CREATE_SERIALIZATION_START(_type,_macro) \
\
static gboolean \
gst_value_deserialize_ ## _type (GValue * dest, const char *s) \
{ \
long long x; \
\
if (gst_value_deserialize_int_helper (&x, s, G_MIN ## _macro, \
G_MAX ## _macro, sizeof (g ## _type))) { \
g_value_set_ ## _type (dest, /*(g ## _type)*/ x); \
return TRUE; \
} else { \
return FALSE; \
} \
}
#define CREATE_USERIALIZATION(_type,_macro) \
CREATE_SERIALIZATION_START(_type,_macro) \
\
static gboolean \
gst_value_deserialize_ ## _type (GValue * dest, const char *s) \
{ \
guint64 x; \
char *end; \
gboolean ret = FALSE; \
\
errno = 0; \
x = g_ascii_strtoull (s, &end, 0); \
/* a range error is a definitive no-no */ \
if (errno == ERANGE) { \
return FALSE; \
} \
/* the cast ensures the range check later on makes sense */ \
x = (g ## _type) x; \
if (*end == 0) { \
ret = TRUE; \
} else { \
if (g_ascii_strcasecmp (s, "little_endian") == 0) { \
x = G_LITTLE_ENDIAN; \
ret = TRUE; \
} else if (g_ascii_strcasecmp (s, "big_endian") == 0) { \
x = G_BIG_ENDIAN; \
ret = TRUE; \
} else if (g_ascii_strcasecmp (s, "byte_order") == 0) { \
x = G_BYTE_ORDER; \
ret = TRUE; \
} else if (g_ascii_strcasecmp (s, "min") == 0) { \
x = 0; \
ret = TRUE; \
} else if (g_ascii_strcasecmp (s, "max") == 0) { \
x = G_MAX ## _macro; \
ret = TRUE; \
} \
} \
if (ret) { \
if (x > G_MAX ## _macro) { \
ret = FALSE; \
} else { \
g_value_set_ ## _type (dest, x); \
} \
} \
return ret; \
}
#define REGISTER_SERIALIZATION(_gtype, _type) \
G_STMT_START { \
static const GstValueTable gst_value = { \
_gtype, \
gst_value_compare_ ## _type, \
gst_value_serialize_ ## _type, \
gst_value_deserialize_ ## _type, \
}; \
\
gst_value_register (&gst_value); \
} G_STMT_END
CREATE_SERIALIZATION (int, INT)
CREATE_SERIALIZATION (int64, INT64)
CREATE_SERIALIZATION (long, LONG)
CREATE_USERIALIZATION (uint, UINT)
CREATE_USERIALIZATION (uint64, UINT64)
CREATE_USERIALIZATION (ulong, ULONG)
/**********
* double *
**********/
static int
gst_value_compare_double (const GValue * value1, const GValue * value2)
{
if (value1->data[0].v_double > value2->data[0].v_double)
return GST_VALUE_GREATER_THAN;
if (value1->data[0].v_double < value2->data[0].v_double)
return GST_VALUE_LESS_THAN;
if (value1->data[0].v_double == value2->data[0].v_double)
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_double (const GValue * value)
{
char d[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (d, G_ASCII_DTOSTR_BUF_SIZE, value->data[0].v_double);
return g_strdup (d);
}
static gboolean
gst_value_deserialize_double (GValue * dest, const char *s)
{
double x;
gboolean ret = FALSE;
char *end;
x = g_ascii_strtod (s, &end);
if (*end == 0) {
ret = TRUE;
} else {
if (g_ascii_strcasecmp (s, "min") == 0) {
x = -G_MAXDOUBLE;
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "max") == 0) {
x = G_MAXDOUBLE;
ret = TRUE;
}
}
if (ret) {
g_value_set_double (dest, x);
}
return ret;
}
/*********
* float *
*********/
static int
gst_value_compare_float (const GValue * value1, const GValue * value2)
{
if (value1->data[0].v_float > value2->data[0].v_float)
return GST_VALUE_GREATER_THAN;
if (value1->data[0].v_float < value2->data[0].v_float)
return GST_VALUE_LESS_THAN;
if (value1->data[0].v_float == value2->data[0].v_float)
return GST_VALUE_EQUAL;
return GST_VALUE_UNORDERED;
}
static char *
gst_value_serialize_float (const GValue * value)
{
char d[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (d, G_ASCII_DTOSTR_BUF_SIZE, value->data[0].v_float);
return g_strdup (d);
}
static gboolean
gst_value_deserialize_float (GValue * dest, const char *s)
{
double x;
gboolean ret = FALSE;
char *end;
x = g_ascii_strtod (s, &end);
if (*end == 0) {
ret = TRUE;
} else {
if (g_ascii_strcasecmp (s, "min") == 0) {
x = -G_MAXFLOAT;
ret = TRUE;
} else if (g_ascii_strcasecmp (s, "max") == 0) {
x = G_MAXFLOAT;
ret = TRUE;
}
}
if (x > G_MAXFLOAT || x < -G_MAXFLOAT)
ret = FALSE;
if (ret) {
g_value_set_float (dest, x);
}
return ret;
}
/**********
* string *
**********/
static int
gst_value_compare_string (const GValue * value1, const GValue * value2)
{
int x = strcmp (value1->data[0].v_pointer, value2->data[0].v_pointer);
if (x < 0)
return GST_VALUE_LESS_THAN;
if (x > 0)
return GST_VALUE_GREATER_THAN;
return GST_VALUE_EQUAL;
}
#define GST_ASCII_IS_STRING(c) (g_ascii_isalnum((c)) || ((c) == '_') || \
((c) == '-') || ((c) == '+') || ((c) == '/') || ((c) == ':') || \
((c) == '.'))
static gchar *
gst_string_wrap (const char *s)
{
const gchar *t;
int len;
gchar *d, *e;
gboolean wrap = FALSE;
len = 0;
t = s;
if (!s)
return g_strdup ("");
while (*t) {
if (GST_ASCII_IS_STRING (*t)) {
len++;
} else if (*t < 0x20 || *t >= 0x7f) {
wrap = TRUE;
len += 4;
} else {
wrap = TRUE;
len += 2;
}
t++;
}
if (!wrap)
return g_strdup (s);
e = d = g_malloc (len + 3);
*e++ = '\"';
t = s;
while (*t) {
if (GST_ASCII_IS_STRING (*t)) {
*e++ = *t++;
} else if (*t < 0x20 || *t >= 0x7f) {
*e++ = '\\';
*e++ = '0' + ((*(guchar *) t) >> 6);
*e++ = '0' + (((*t) >> 3) & 0x7);
*e++ = '0' + ((*t++) & 0x7);
} else {
*e++ = '\\';
*e++ = *t++;
}
}
*e++ = '\"';
*e = 0;
return d;
}
/*
* This function takes a string delimited with double quotes (")
* and unescapes any \xxx octal numbers.
*
* If sequences of \y are found where y is not in the range of
* 0->3, y is copied unescaped.
*
* If \xyy is found where x is an octal number but y is not, an
* error is encountered and NULL is returned.
*
* the input string must be \0 terminated.
*/
static char *
gst_string_unwrap (const gchar * s)
{
gchar *ret;
gchar *read, *write;
/* NULL string returns NULL */
if (s == NULL)
return NULL;
/* strings not starting with " are invalid */
if (*s != '"')
return NULL;
/* make copy of original string to hold the result. This
* string will always be smaller than the original */
ret = g_strdup (s);
read = ret;
write = ret;
/* need to move to the next position as we parsed the " */
read++;
while (*read) {
if (GST_ASCII_IS_STRING (*read)) {
/* normal chars are just copied */
*write++ = *read++;
} else if (*read == '"') {
/* quote marks end of string */
break;
} else if (*read == '\\') {
/* got an escape char, move to next position to read a tripplet
* of octal numbers */
read++;
/* is the next char a possible first octal number? */
if (*read >= '0' && *read <= '3') {
/* parse other 2 numbers, if one of them is not in the range of
* an octal number, we error. We also catch the case where a zero
* byte is found here. */
if (read[1] < '0' || read[1] > '7' || read[2] < '0' || read[2] > '7')
goto beach;
/* now convert the octal number to a byte again. */
*write++ = ((read[0] - '0') << 6) +
((read[1] - '0') << 3) + (read[2] - '0');
read += 3;
} else {
/* if we run into a \0 here, we definately won't get a quote later */
if (*read == 0)
goto beach;
/* else copy \X sequence */
*write++ = *read++;
}
} else {
/* weird character, error */
goto beach;
}
}
/* if the string is not ending in " and zero terminated, we error */
if (*read != '"' || read[1] != '\0')
goto beach;
/* null terminate result string and return */
*write++ = '\0';
return ret;
beach:
g_free (ret);
return NULL;
}
static char *
gst_value_serialize_string (const GValue * value)
{
return gst_string_wrap (value->data[0].v_pointer);
}
static gboolean
gst_value_deserialize_string (GValue * dest, const char *s)
{
if (*s != '"') {
if (!g_utf8_validate (s, -1, NULL))
return FALSE;
g_value_set_string (dest, s);
return TRUE;
} else {
gchar *str = gst_string_unwrap (s);
if (!str)
return FALSE;
g_value_take_string (dest, str);
}
return TRUE;
}
/********
* enum *
********/
static int
gst_value_compare_enum (const GValue * value1, const GValue * value2)
{
GEnumValue *en1, *en2;
GEnumClass *klass1 = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (value1));
GEnumClass *klass2 = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (value2));
g_return_val_if_fail (klass1, GST_VALUE_UNORDERED);
g_return_val_if_fail (klass2, GST_VALUE_UNORDERED);
en1 = g_enum_get_value (klass1, g_value_get_enum (value1));
en2 = g_enum_get_value (klass2, g_value_get_enum (value2));
g_type_class_unref (klass1);
g_type_class_unref (klass2);
g_return_val_if_fail (en1, GST_VALUE_UNORDERED);
g_return_val_if_fail (en2, GST_VALUE_UNORDERED);
if (en1->value < en2->value)
return GST_VALUE_LESS_THAN;
if (en1->value > en2->value)
return GST_VALUE_GREATER_THAN;
return GST_VALUE_EQUAL;
}
static char *
gst_value_serialize_enum (const GValue * value)
{
GEnumValue *en;
GEnumClass *klass = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (value));
g_return_val_if_fail (klass, NULL);
en = g_enum_get_value (klass, g_value_get_enum (value));
g_type_class_unref (klass);
g_return_val_if_fail (en, NULL);
return g_strdup (en->value_name);
}
static gboolean
gst_value_deserialize_enum (GValue * dest, const char *s)
{
GEnumValue *en;
gchar *endptr = NULL;
GEnumClass *klass = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (dest));
g_return_val_if_fail (klass, FALSE);
if (!(en = g_enum_get_value_by_name (klass, s))) {
if (!(en = g_enum_get_value_by_nick (klass, s))) {
gint i = strtol (s, &endptr, 0);
if (endptr && *endptr == '\0') {
en = g_enum_get_value (klass, i);
}
}
}
g_type_class_unref (klass);
g_return_val_if_fail (en, FALSE);
g_value_set_enum (dest, en->value);
return TRUE;
}
/********
* flags *
********/
/* we just compare the value here */
static int
gst_value_compare_flags (const GValue * value1, const GValue * value2)
{
guint fl1, fl2;
GFlagsClass *klass1 =
(GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (value1));
GFlagsClass *klass2 =
(GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (value2));
g_return_val_if_fail (klass1, GST_VALUE_UNORDERED);
g_return_val_if_fail (klass2, GST_VALUE_UNORDERED);
fl1 = g_value_get_flags (value1);
fl2 = g_value_get_flags (value2);
g_type_class_unref (klass1);
g_type_class_unref (klass2);
if (fl1 < fl2)
return GST_VALUE_LESS_THAN;
if (fl1 > fl2)
return GST_VALUE_GREATER_THAN;
return GST_VALUE_EQUAL;
}
/* the different flags are serialized separated with a + */
static char *
gst_value_serialize_flags (const GValue * value)
{
guint flags;
GFlagsValue *fl;
GFlagsClass *klass = (GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (value));
gchar *result, *tmp;
gboolean first = TRUE;
g_return_val_if_fail (klass, NULL);
result = g_strdup ("");
flags = g_value_get_flags (value);
while (flags) {
fl = g_flags_get_first_value (klass, flags);
if (fl != NULL) {
tmp = g_strconcat (result, (first ? "" : "+"), fl->value_name, NULL);
g_free (result);
result = tmp;
first = FALSE;
}
/* clear flag */
flags &= ~fl->value;
}
g_type_class_unref (klass);
return result;
}
static gboolean
gst_value_deserialize_flags (GValue * dest, const char *s)
{
GFlagsValue *fl;
gchar *endptr = NULL;
GFlagsClass *klass = (GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (dest));
gchar **split;
guint flags;
gint i;
g_return_val_if_fail (klass, FALSE);
/* split into parts delimited with + */
split = g_strsplit (s, "+", 0);
flags = 0;
i = 0;
/* loop over each part */
while (split[i]) {
if (!(fl = g_flags_get_value_by_name (klass, split[i]))) {
if (!(fl = g_flags_get_value_by_nick (klass, split[i]))) {
gint val = strtol (split[i], &endptr, 0);
/* just or numeric value */
if (endptr && *endptr == '\0') {
flags |= val;
}
}
}
if (fl) {
flags |= fl->value;
}
i++;
}
g_strfreev (split);
g_type_class_unref (klass);
g_value_set_flags (dest, flags);
return TRUE;
}
/*********
* union *
*********/
static gboolean
gst_value_union_int_int_range (GValue * dest, const GValue * src1,
const GValue * src2)
{
if (src2->data[0].v_int <= src1->data[0].v_int &&
src2->data[1].v_int >= src1->data[0].v_int) {
gst_value_init_and_copy (dest, src2);
return TRUE;
}
return FALSE;
}
static gboolean
gst_value_union_int_range_int_range (GValue * dest, const GValue * src1,
const GValue * src2)
{
int min;
int max;
min = MAX (src1->data[0].v_int, src2->data[0].v_int);
max = MIN (src1->data[1].v_int, src2->data[1].v_int);
if (min <= max) {
g_value_init (dest, GST_TYPE_INT_RANGE);
gst_value_set_int_range (dest,
MIN (src1->data[0].v_int, src2->data[0].v_int),
MAX (src1->data[1].v_int, src2->data[1].v_int));
return TRUE;
}
return FALSE;
}
/****************
* intersection *
****************/
static gboolean
gst_value_intersect_int_int_range (GValue * dest, const GValue * src1,
const GValue * src2)
{
if (src2->data[0].v_int <= src1->data[0].v_int &&
src2->data[1].v_int >= src1->data[0].v_int) {
gst_value_init_and_copy (dest, src1);
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;
min = MAX (src1->data[0].v_int, src2->data[0].v_int);
max = MIN (src1->data[1].v_int, src2->data[1].v_int);
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;
}
static gboolean
gst_value_intersect_double_double_range (GValue * dest, const GValue * src1,
const GValue * src2)
{
if (src2->data[0].v_double <= src1->data[0].v_double &&
src2->data[1].v_double >= src1->data[0].v_double) {
gst_value_init_and_copy (dest, src1);
return TRUE;
}
return FALSE;
}
static gboolean
gst_value_intersect_double_range_double_range (GValue * dest,
const GValue * src1, const GValue * src2)
{
double min;
double max;
min = MAX (src1->data[0].v_double, src2->data[0].v_double);
max = MIN (src1->data[1].v_double, src2->data[1].v_double);
if (min < max) {
g_value_init (dest, GST_TYPE_DOUBLE_RANGE);
gst_value_set_double_range (dest, min, max);
return TRUE;
}
if (min == max) {
g_value_init (dest, G_TYPE_DOUBLE);
g_value_set_int (dest, min);
return TRUE;
}
return FALSE;
}
static gboolean
gst_value_intersect_list (GValue * dest, const GValue * value1,
const GValue * value2)
{
guint i, size;
GValue intersection = { 0, };
gboolean ret = FALSE;
size = gst_value_list_get_size (value1);
for (i = 0; i < size; i++) {
const GValue *cur = gst_value_list_get_value (value1, i);
if (gst_value_intersect (&intersection, cur, value2)) {
/* append value */
if (!ret) {
gst_value_init_and_copy (dest, &intersection);
ret = TRUE;
} else if (GST_VALUE_HOLDS_LIST (dest)) {
gst_value_list_append_value (dest, &intersection);
} else {
GValue temp = { 0, };
gst_value_init_and_copy (&temp, dest);
g_value_unset (dest);
gst_value_list_concat (dest, &temp, &intersection);
g_value_unset (&temp);
}
g_value_unset (&intersection);
}
}
return ret;
}
static gboolean
gst_value_intersect_array (GValue * dest, const GValue * src1,
const GValue * src2)
{
gint size, n;
GValue val = { 0 };
/* only works on similar-sized arrays */
size = gst_value_list_get_size (src1);
if (size != gst_value_list_get_size (src2))
return FALSE;
g_value_init (dest, GST_TYPE_ARRAY);
for (n = 0; n < size; n++) {
if (!gst_value_intersect (&val, gst_value_list_get_value (src1, n),
gst_value_list_get_value (src2, n))) {
g_value_unset (dest);
return FALSE;
}
gst_value_list_append_value (dest, &val);
g_value_unset (&val);
}
return TRUE;
}
/***************
* subtraction *
***************/
static gboolean
gst_value_subtract_int_int_range (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
int min = gst_value_get_int_range_min (subtrahend);
int max = gst_value_get_int_range_max (subtrahend);
int val = g_value_get_int (minuend);
/* subtracting a range from an int only works if the int is not in the
* range */
if (val < min || val > max) {
/* and the result is the int */
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
return FALSE;
}
/* creates a new int range based on input values.
*/
static gboolean
gst_value_create_new_range (GValue * dest, int min1, int max1, int min2,
int max2)
{
GValue v1 = { 0, };
GValue v2 = { 0, };
GValue *pv1, *pv2; /* yeah, hungarian! */
if (min1 <= max1 && min2 <= max2) {
pv1 = &v1;
pv2 = &v2;
} else if (min1 <= max1) {
pv1 = dest;
pv2 = NULL;
} else if (min2 <= max2) {
pv1 = NULL;
pv2 = dest;
} else {
return FALSE;
}
if (min1 < max1) {
g_value_init (pv1, GST_TYPE_INT_RANGE);
gst_value_set_int_range (pv1, min1, max1);
} else if (min1 == max1) {
g_value_init (pv1, G_TYPE_INT);
g_value_set_int (pv1, min1);
}
if (min2 < max2) {
g_value_init (pv2, GST_TYPE_INT_RANGE);
gst_value_set_int_range (pv2, min2, max2);
} else if (min2 == max2) {
g_value_init (pv2, G_TYPE_INT);
g_value_set_int (pv2, min2);
}
if (min1 <= max1 && min2 <= max2) {
gst_value_list_concat (dest, pv1, pv2);
g_value_unset (pv1);
g_value_unset (pv2);
}
return TRUE;
}
static gboolean
gst_value_subtract_int_range_int (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
int min = gst_value_get_int_range_min (minuend);
int max = gst_value_get_int_range_max (minuend);
int val = g_value_get_int (subtrahend);
g_return_val_if_fail (min < max, FALSE);
/* value is outside of the range, return range unchanged */
if (val < min || val > max) {
gst_value_init_and_copy (dest, minuend);
return TRUE;
} else {
/* max must be MAXINT too as val <= max */
if (val == G_MAXINT) {
max--;
val--;
}
/* min must be MININT too as val >= max */
if (val == G_MININT) {
min++;
val++;
}
gst_value_create_new_range (dest, min, val - 1, val + 1, max);
}
return TRUE;
}
static gboolean
gst_value_subtract_int_range_int_range (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
int min1 = gst_value_get_int_range_min (minuend);
int max1 = gst_value_get_int_range_max (minuend);
int min2 = gst_value_get_int_range_min (subtrahend);
int max2 = gst_value_get_int_range_max (subtrahend);
if (max2 == G_MAXINT && min2 == G_MININT) {
return FALSE;
} else if (max2 == G_MAXINT) {
return gst_value_create_new_range (dest, min1, MIN (min2 - 1, max1), 1, 0);
} else if (min2 == G_MININT) {
return gst_value_create_new_range (dest, MAX (max2 + 1, min1), max1, 1, 0);
} else {
return gst_value_create_new_range (dest, min1, MIN (min2 - 1, max1),
MAX (max2 + 1, min1), max1);
}
}
static gboolean
gst_value_subtract_double_double_range (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
double min = gst_value_get_double_range_min (subtrahend);
double max = gst_value_get_double_range_max (subtrahend);
double val = g_value_get_double (minuend);
if (val < min || val > max) {
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
return FALSE;
}
static gboolean
gst_value_subtract_double_range_double (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
/* since we don't have open ranges, we cannot create a hole in
* a double range. We return the original range */
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
static gboolean
gst_value_subtract_double_range_double_range (GValue * dest,
const GValue * minuend, const GValue * subtrahend)
{
/* since we don't have open ranges, we have to approximate */
/* done like with ints */
double min1 = gst_value_get_double_range_min (minuend);
double max2 = gst_value_get_double_range_max (minuend);
double max1 = MIN (gst_value_get_double_range_min (subtrahend), max2);
double min2 = MAX (gst_value_get_double_range_max (subtrahend), min1);
GValue v1 = { 0, };
GValue v2 = { 0, };
GValue *pv1, *pv2; /* yeah, hungarian! */
if (min1 < max1 && min2 < max2) {
pv1 = &v1;
pv2 = &v2;
} else if (min1 < max1) {
pv1 = dest;
pv2 = NULL;
} else if (min2 < max2) {
pv1 = NULL;
pv2 = dest;
} else {
return FALSE;
}
if (min1 < max1) {
g_value_init (pv1, GST_TYPE_DOUBLE_RANGE);
gst_value_set_double_range (pv1, min1, max1);
}
if (min2 < max2) {
g_value_init (pv2, GST_TYPE_DOUBLE_RANGE);
gst_value_set_double_range (pv2, min2, max2);
}
if (min1 < max1 && min2 < max2) {
gst_value_list_concat (dest, pv1, pv2);
g_value_unset (pv1);
g_value_unset (pv2);
}
return TRUE;
}
static gboolean
gst_value_subtract_from_list (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
guint i, size;
GValue subtraction = { 0, };
gboolean ret = FALSE;
size = gst_value_list_get_size (minuend);
for (i = 0; i < size; i++) {
const GValue *cur = gst_value_list_get_value (minuend, i);
if (gst_value_subtract (&subtraction, cur, subtrahend)) {
if (!ret) {
gst_value_init_and_copy (dest, &subtraction);
ret = TRUE;
} else if (GST_VALUE_HOLDS_LIST (dest)
&& GST_VALUE_HOLDS_LIST (&subtraction)) {
/* unroll */
GValue unroll = { 0, };
gst_value_init_and_copy (&unroll, dest);
g_value_unset (dest);
gst_value_list_concat (dest, &unroll, &subtraction);
} else if (GST_VALUE_HOLDS_LIST (dest)) {
gst_value_list_append_value (dest, &subtraction);
} else {
GValue temp = { 0, };
gst_value_init_and_copy (&temp, dest);
g_value_unset (dest);
gst_value_list_concat (dest, &temp, &subtraction);
g_value_unset (&temp);
}
g_value_unset (&subtraction);
}
}
return ret;
}
static gboolean
gst_value_subtract_list (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
guint i, size;
GValue data[2] = { {0,}, {0,} };
GValue *subtraction = &data[0], *result = &data[1];
gst_value_init_and_copy (result, minuend);
size = gst_value_list_get_size (subtrahend);
for (i = 0; i < size; i++) {
const GValue *cur = gst_value_list_get_value (subtrahend, i);
if (gst_value_subtract (subtraction, result, cur)) {
GValue *temp = result;
result = subtraction;
subtraction = temp;
g_value_unset (subtraction);
} else {
g_value_unset (result);
return FALSE;
}
}
gst_value_init_and_copy (dest, result);
g_value_unset (result);
return TRUE;
}
/**************
* comparison *
**************/
/**
* gst_value_can_compare:
* @value1: a value to compare
* @value2: another value to compare
*
* Determines if @value1 and @value2 can be compared.
*
* Returns: TRUE if the values can be compared
*/
gboolean
gst_value_can_compare (const GValue * value1, const GValue * value2)
{
GstValueTable *table;
int i;
if (G_VALUE_TYPE (value1) != G_VALUE_TYPE (value2))
return FALSE;
for (i = 0; i < gst_value_table->len; i++) {
table = &g_array_index (gst_value_table, GstValueTable, i);
if (g_type_is_a (G_VALUE_TYPE (value1), table->type) && table->compare)
return TRUE;
}
return FALSE;
}
/**
* gst_value_compare:
* @value1: a value to compare
* @value2: another value to compare
*
* Compares @value1 and @value2. If @value1 and @value2 cannot be
* compared, the function returns GST_VALUE_UNORDERED. Otherwise,
* if @value1 is greater than @value2, GST_VALUE_GREATER is returned.
* If @value1 is less than @value2, GST_VALUE_LESSER is returned.
* If the values are equal, GST_VALUE_EQUAL is returned.
*
* Returns: A GstValueCompareType value
*/
int
gst_value_compare (const GValue * value1, const GValue * value2)
{
GstValueTable *table, *best = NULL;
int i;
if (G_VALUE_TYPE (value1) != G_VALUE_TYPE (value2))
return GST_VALUE_UNORDERED;
for (i = 0; i < gst_value_table->len; i++) {
table = &g_array_index (gst_value_table, GstValueTable, i);
if (table->type == G_VALUE_TYPE (value1) && table->compare != NULL) {
best = table;
break;
}
if (g_type_is_a (G_VALUE_TYPE (value1), table->type)) {
if (!best || g_type_is_a (table->type, best->type))
best = table;
}
}
if (best) {
return best->compare (value1, value2);
}
g_critical ("unable to compare values of type %s\n",
g_type_name (G_VALUE_TYPE (value1)));
return GST_VALUE_UNORDERED;
}
/* union */
/**
* gst_value_can_union:
* @value1: a value to union
* @value2: another value to union
*
* Determines if @value1 and @value2 can be non-trivially unioned.
* Any two values can be trivially unioned by adding both of them
* to a GstValueList. However, certain types have the possibility
* to be unioned in a simpler way. For example, an integer range
* and an integer can be unioned if the integer is a subset of the
* integer range. If there is the possibility that two values can
* be unioned, this function returns TRUE.
*
* Returns: TRUE if there is a function allowing the two values to
* be unioned.
*/
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;
if (union_info->type1 == G_VALUE_TYPE (value2) &&
union_info->type2 == G_VALUE_TYPE (value1))
return TRUE;
}
return FALSE;
}
/**
* gst_value_union:
* @dest: the destination value
* @value1: a value to union
* @value2: another value to union
*
* Creates a GValue cooresponding to the union of @value1 and @value2.
*
* Returns: TRUE if the values could be unioned
*/
gboolean
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)) {
if (union_info->func (dest, value1, value2)) {
return TRUE;
}
}
if (union_info->type1 == G_VALUE_TYPE (value2) &&
union_info->type2 == G_VALUE_TYPE (value1)) {
if (union_info->func (dest, value2, value1)) {
return TRUE;
}
}
}
gst_value_list_concat (dest, value1, value2);
return TRUE;
}
/**
* gst_value_register_union_func:
* @type1: a type to union
* @type2: another type to union
* @func: a function that implments creating a union between the two types
*
* Registers a union function that can create a union between GValues
* of the type @type1 and @type2.
*
*/
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 */
/**
* gst_value_can_intersect:
* @value1: a value to intersect
* @value2: another value to intersect
*
* Determines if intersecting two values will produce a valid result.
* Two values will produce a valid intersection if they have the same
* type, or if there is a method (registered by
* #gst_value_register_intersection_func) to calculate the intersection.
*
* Returns: TRUE if the values can intersect
*/
gboolean
gst_value_can_intersect (const GValue * value1, const GValue * value2)
{
GstValueIntersectInfo *intersect_info;
int i;
/* special cases */
if (GST_VALUE_HOLDS_LIST (value1) || GST_VALUE_HOLDS_LIST (value2))
return TRUE;
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))
if (intersect_info->type2 == G_VALUE_TYPE (value1) &&
intersect_info->type1 == G_VALUE_TYPE (value2))
return TRUE;
}
return gst_value_can_compare (value1, value2);
}
/**
* gst_value_intersect:
* @dest: a uninitialized #GValue that will hold the calculated
* intersection value
* @value1: a value to intersect
* @value2: another value to intersect
*
* Calculates the intersection of two values. If the values have
* a non-empty intersection, the value representing the intersection
* is placed in @dest. If the intersection is non-empty, @dest is
* not modified.
*
* Returns: TRUE if the intersection is non-empty
*/
gboolean
gst_value_intersect (GValue * dest, const GValue * value1,
const GValue * value2)
{
GstValueIntersectInfo *intersect_info;
int i;
int ret = FALSE;
/* special cases first */
if (GST_VALUE_HOLDS_LIST (value1))
return gst_value_intersect_list (dest, value1, value2);
if (GST_VALUE_HOLDS_LIST (value2))
return gst_value_intersect_list (dest, value2, value1);
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)) {
ret = intersect_info->func (dest, value1, value2);
return ret;
}
if (intersect_info->type1 == G_VALUE_TYPE (value2) &&
intersect_info->type2 == G_VALUE_TYPE (value1)) {
ret = intersect_info->func (dest, value2, value1);
return ret;
}
}
if (gst_value_compare (value1, value2) == GST_VALUE_EQUAL) {
gst_value_init_and_copy (dest, value1);
ret = TRUE;
}
return ret;
}
/**
* gst_value_register_intersection_func:
* @type1: the first type to intersect
* @type2: the second type to intersect
* @func: the intersection function
*
* Registers a function that is called to calculate the intersection
* of the values having the types @type1 and @type2.
*/
/**
* GstValueIntersectFunc:
* @dest: a uninitialized #GValue that will hold the calculated
* intersection value
* @value1: a value to intersect
* @value2: another value to intersect
*
* Functions having this type calculate the intersection of @value1
* and @value2. If the intersection is non-empty, the result is
* placed in @dest and TRUE is returned. If the intersection is
* empty, @dest is unmodified and FALSE is returned.
*
* Returns: TRUE if the intersection is non-empty, FALSE otherwise
*/
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);
}
/* subtraction */
/**
* gst_value_subtract:
* @dest: the destination value for the result if the subtraction is not empty
* @minuend: the value to subtract from
* @subtrahend: the value to subtract
*
* Subtracts @subtrahend from @minuend and stores the result in @dest.
* Note that this means subtraction as in sets, not as in mathematics.
*
* Returns: TRUE if the subtraction is not empty
*/
gboolean
gst_value_subtract (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
GstValueSubtractInfo *info;
int i;
/* special cases first */
if (GST_VALUE_HOLDS_LIST (minuend))
return gst_value_subtract_from_list (dest, minuend, subtrahend);
if (GST_VALUE_HOLDS_LIST (subtrahend))
return gst_value_subtract_list (dest, minuend, subtrahend);
for (i = 0; i < gst_value_subtract_funcs->len; i++) {
info = &g_array_index (gst_value_subtract_funcs, GstValueSubtractInfo, i);
if (info->minuend == G_VALUE_TYPE (minuend) &&
info->subtrahend == G_VALUE_TYPE (subtrahend)) {
return info->func (dest, minuend, subtrahend);
}
}
if (gst_value_compare (minuend, subtrahend) != GST_VALUE_EQUAL) {
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
return FALSE;
}
#if 0
gboolean
gst_value_subtract (GValue * dest, const GValue * minuend,
const GValue * subtrahend)
{
gboolean ret = gst_value_subtract2 (dest, minuend, subtrahend);
g_printerr ("\"%s\" - \"%s\" = \"%s\"\n", gst_value_serialize (minuend),
gst_value_serialize (subtrahend),
ret ? gst_value_serialize (dest) : "---");
return ret;
}
#endif
/**
* gst_value_can_subtract:
* @minuend: the value to subtract from
* @subtrahend: the value to subtract
*
* Checks if it's possible to subtract @subtrahend from @minuend.
*
* Returns: TRUE if a subtraction is possible
*/
gboolean
gst_value_can_subtract (const GValue * minuend, const GValue * subtrahend)
{
GstValueSubtractInfo *info;
int i;
/* special cases */
if (GST_VALUE_HOLDS_LIST (minuend) || GST_VALUE_HOLDS_LIST (subtrahend))
return TRUE;
for (i = 0; i < gst_value_subtract_funcs->len; i++) {
info = &g_array_index (gst_value_subtract_funcs, GstValueSubtractInfo, i);
if (info->minuend == G_VALUE_TYPE (minuend) &&
info->subtrahend == G_VALUE_TYPE (subtrahend))
return TRUE;
}
return gst_value_can_compare (minuend, subtrahend);
}
/**
* gst_value_register_subtract_func:
* @minuend_type: type of the minuend
* @subtrahend_type: type of the subtrahend
* @func: function to use
*
* Registers @func as a function capable of subtracting the values of
* @subtrahend_type from values of @minuend_type.
*/
void
gst_value_register_subtract_func (GType minuend_type, GType subtrahend_type,
GstValueSubtractFunc func)
{
GstValueSubtractInfo info;
/* one type must be unfixed, other subtractions can be done as comparisons */
g_return_if_fail (!gst_type_is_fixed (minuend_type)
|| !gst_type_is_fixed (subtrahend_type));
info.minuend = minuend_type;
info.subtrahend = subtrahend_type;
info.func = func;
g_array_append_val (gst_value_subtract_funcs, info);
}
/**
* gst_value_register:
* @table: structure containing functions to register
*
* Registers functions to perform calculations on #GValues of a given
* type.
*/
/**
* GstValueTable:
* @type: GType that the functions operate on.
* @compare: A function that compares two values of this type.
* @serialize: A function that transforms a value of this type to a
* string. Strings created by this function must be unique and should
* be human readable.
* @deserialize: A function that transforms a string to a value of
* this type. This function must transform strings created by the
* serialize function back to the original value. This function may
* optionally transform other strings into values.
*/
void
gst_value_register (const GstValueTable * table)
{
g_array_append_val (gst_value_table, *table);
}
/**
* gst_value_init_and_copy:
* @dest: the target value
* @src: the source value
*
* Initialises the target value to be of the same type as source and then copies
* the contents from source to target.
*/
void
gst_value_init_and_copy (GValue * dest, const GValue * src)
{
g_value_init (dest, G_VALUE_TYPE (src));
g_value_copy (src, dest);
}
/**
* gst_value_serialize:
* @value: a #GValue to serialize
*
* tries to transform the given @value into a string representation that allows
* getting back this string later on using gst_value_deserialize().
*
* Returns: the serialization for @value or NULL if none exists
*/
gchar *
gst_value_serialize (const GValue * value)
{
int i;
GValue s_val = { 0 };
GstValueTable *table, *best = NULL;
char *s;
g_return_val_if_fail (G_IS_VALUE (value), NULL);
for (i = 0; i < gst_value_table->len; i++) {
table = &g_array_index (gst_value_table, GstValueTable, i);
if (table->serialize == NULL)
continue;
if (table->type == G_VALUE_TYPE (value)) {
best = table;
break;
}
if (g_type_is_a (G_VALUE_TYPE (value), table->type)) {
if (!best || g_type_is_a (table->type, best->type))
best = table;
}
}
if (best)
return best->serialize (value);
g_value_init (&s_val, G_TYPE_STRING);
if (g_value_transform (value, &s_val)) {
s = gst_string_wrap (g_value_get_string (&s_val));
} else {
s = NULL;
}
g_value_unset (&s_val);
return s;
}
/**
* gst_value_deserialize:
* @dest: #GValue to fill with contents of deserialization
* @src: string to deserialize
*
* Tries to deserialize a string into the type specified by the given GValue.
* If the operation succeeds, TRUE is returned, FALSE otherwise.
*
* Returns: TRUE on success
*/
gboolean
gst_value_deserialize (GValue * dest, const gchar * src)
{
GstValueTable *table, *best = NULL;
int i;
g_return_val_if_fail (src != NULL, FALSE);
g_return_val_if_fail (G_IS_VALUE (dest), FALSE);
for (i = 0; i < gst_value_table->len; i++) {
table = &g_array_index (gst_value_table, GstValueTable, i);
if (table->serialize == NULL)
continue;
if (table->type == G_VALUE_TYPE (dest)) {
best = table;
break;
}
if (g_type_is_a (G_VALUE_TYPE (dest), table->type)) {
if (!best || g_type_is_a (table->type, best->type))
best = table;
}
}
if (best) {
return best->deserialize (dest, src);
}
return FALSE;
}
/**
* gst_value_is_fixed:
* @value: the #GValue to check
*
* Tests if the given GValue, if available in a GstStructure (or any other
* container) contains a "fixed" (which means: one value) or an "unfixed"
* (which means: multiple possible values, such as data lists or data
* ranges) value.
*
* Returns: true if the value is "fixed".
*/
gboolean
gst_value_is_fixed (const GValue * value)
{
GType type = G_VALUE_TYPE (value);
if (type == GST_TYPE_ARRAY) {
gboolean fixed = TRUE;
gint size, n;
const GValue *kid;
/* check recursively */
size = gst_value_list_get_size (value);
for (n = 0; n < size; n++) {
kid = gst_value_list_get_value (value, n);
fixed &= gst_value_is_fixed (kid);
}
return fixed;
}
return gst_type_is_fixed (type);
}
/************
* fraction *
************/
/* helper functions */
/* Finds the greatest common divisor.
* Returns 1 if none other found.
* This is Euclid's algorithm. */
static gint
gst_greatest_common_divisor (gint a, gint b)
{
while (b != 0) {
int temp = a;
a = b;
b = temp % b;
}
return ABS (a);
}
static void
gst_value_init_fraction (GValue * value)
{
value->data[0].v_int = 0;
value->data[1].v_int = 1;
}
static void
gst_value_copy_fraction (const GValue * src_value, GValue * dest_value)
{
dest_value->data[0].v_int = src_value->data[0].v_int;
dest_value->data[1].v_int = src_value->data[1].v_int;
}
static gchar *
gst_value_collect_fraction (GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
value->data[0].v_int = collect_values[0].v_int;
value->data[1].v_int = collect_values[1].v_int;
return NULL;
}
static gchar *
gst_value_lcopy_fraction (const GValue * value, guint n_collect_values,
GTypeCValue * collect_values, guint collect_flags)
{
gint *numerator = collect_values[0].v_pointer;
gint *denominator = collect_values[1].v_pointer;
if (!numerator)
return g_strdup_printf ("numerator for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
if (!denominator)
return g_strdup_printf ("denominator for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*numerator = value->data[0].v_int;
*denominator = value->data[1].v_int;
return NULL;
}
/**
* gst_value_set_fraction:
* @value: a GValue initialized to #GST_TYPE_FRACTION
* @numerator: the numerator of the fraction
* @denominator: the denominator of the fraction
*
* Sets @value to the fraction specified by @numerator over @denominator.
* The fraction gets reduced to the smallest numerator and denominator,
* and if necessary the sign is moved to the numerator.
*/
void
gst_value_set_fraction (GValue * value, gint numerator, gint denominator)
{
gint gcd = 0;
g_return_if_fail (GST_VALUE_HOLDS_FRACTION (value));
g_return_if_fail (denominator != 0);
g_return_if_fail (denominator >= -G_MAXINT);
g_return_if_fail (numerator >= -G_MAXINT);
/* normalize sign */
if (denominator < 0) {
numerator = -numerator;
denominator = -denominator;
}
/* check for reduction */
gcd = gst_greatest_common_divisor (numerator, denominator);
if (gcd) {
numerator /= gcd;
denominator /= gcd;
}
value->data[0].v_int = numerator;
value->data[1].v_int = denominator;
}
/**
* gst_value_get_fraction_numerator:
* @value: a GValue initialized to #GST_TYPE_FRACTION
*
* Gets the numerator of the fraction specified by @value.
*
* Returns: the numerator of the fraction.
*/
int
gst_value_get_fraction_numerator (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (value), 0);
return value->data[0].v_int;
}
/**
* gst_value_get_fraction_denominator:
* @value: a GValue initialized to #GST_TYPE_FRACTION
*
* Gets the denominator of the fraction specified by @value.
*
* Returns: the denominator of the fraction.
*/
int
gst_value_get_fraction_denominator (const GValue * value)
{
g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (value), 0);
return value->data[1].v_int;
}
/**
* gst_value_fraction_multiply:
* @product: a GValue initialized to #GST_TYPE_FRACTION
* @factor1: a GValue initialized to #GST_TYPE_FRACTION
* @factor2: a GValue initialized to #GST_TYPE_FRACTION
*
* Multiplies the two GValues containing a GstFraction and sets @product
* to the product of the two fractions.
*
* Returns: FALSE in case of an error (like integer overflow), TRUE otherwise.
*/
gboolean
gst_value_fraction_multiply (GValue * product, const GValue * factor1,
const GValue * factor2)
{
gint gcd, n1, n2, d1, d2;
g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (factor1), FALSE);
g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (factor2), FALSE);
n1 = factor1->data[0].v_int;
n2 = factor2->data[0].v_int;
d1 = factor1->data[1].v_int;
d2 = factor2->data[1].v_int;
gcd = gst_greatest_common_divisor (n1, d2);
n1 /= gcd;
d2 /= gcd;
gcd = gst_greatest_common_divisor (n2, d1);
n2 /= gcd;
d1 /= gcd;
g_return_val_if_fail (n1 == 0 || G_MAXINT / ABS (n1) >= ABS (n2), FALSE);
g_return_val_if_fail (G_MAXINT / ABS (d1) >= ABS (d2), FALSE);
gst_value_set_fraction (product, n1 * n2, d1 * d2);
return TRUE;
}
static char *
gst_value_serialize_fraction (const GValue * value)
{
gint32 numerator = value->data[0].v_int;
gint32 denominator = value->data[1].v_int;
gboolean positive = TRUE;
/* get the sign and make components absolute */
if (numerator < 0) {
numerator = -numerator;
positive = !positive;
}
if (denominator < 0) {
denominator = -denominator;
positive = !positive;
}
return g_strdup_printf ("%s%d/%d",
positive ? "" : "-", numerator, denominator);
}
static gboolean
gst_value_deserialize_fraction (GValue * dest, const char *s)
{
gint num, den;
char *div;
char *tmp;
div = strstr (s, "/");
if (!div)
return FALSE;
tmp = g_strndup (s, (size_t) (div - s));
num = atoi (tmp);
g_free (tmp);
den = atoi (div + 1);
gst_value_set_fraction (dest, num, den);
return TRUE;
}
static void
gst_value_transform_fraction_string (const GValue * src_value,
GValue * dest_value)
{
dest_value->data[0].v_pointer = gst_value_serialize_fraction (src_value);
}
static void
gst_value_transform_string_fraction (const GValue * src_value,
GValue * dest_value)
{
gst_value_deserialize_fraction (dest_value, src_value->data[0].v_pointer);
}
#define MAX_TERMS 30
#define MIN_DIVISOR 1.0e-10
#define MAX_ERROR 1.0e-20
/* use continued fractions to transform a double into a fraction,
* see http://mathforum.org/dr.math/faq/faq.fractions.html#decfrac.
* This algorithm takes care of overflows.
*/
static void
gst_value_transform_double_fraction (const GValue * src_value,
GValue * dest_value)
{
gdouble V, F; /* double being converted */
gint N, D; /* will contain the result */
gint A; /* current term in continued fraction */
gint64 N1, D1; /* numerator, denominator of last approx */
gint64 N2, D2; /* numerator, denominator of previous approx */
gint i;
gboolean negative = FALSE;
/* initialize fraction being converted */
F = src_value->data[0].v_double;
if (F < 0.0) {
F = -F;
negative = TRUE;
}
V = F;
/* initialize fractions with 1/0, 0/1 */
N1 = 1;
D1 = 0;
N2 = 0;
D2 = 1;
N = 1;
D = 1;
for (i = 0; i < MAX_TERMS; i++) {
/* get next term */
A = floor (F);
/* get new divisor */
F = F - A;
/* calculate new fraction in temp */
N2 = N1 * A + N2;
D2 = D1 * A + D2;
/* guard against overflow */
if (N2 > G_MAXINT || D2 > G_MAXINT) {
break;
}
N = N2;
D = D2;
/* save last two fractions */
N2 = N1;
D2 = D1;
N1 = N;
D1 = D;
/* quit if dividing by zero or close enough to target */
if (F < MIN_DIVISOR || fabs (V - ((gdouble) N) / D) < MAX_ERROR) {
break;
}
/* Take reciprocal */
F = 1 / F;
}
/* fix for overflow */
if (D == 0) {
N = G_MAXINT;
D = 1;
}
/* fix for negative */
if (negative)
N = -N;
/* will also simplify */
gst_value_set_fraction (dest_value, N, D);
}
static void
gst_value_transform_fraction_double (const GValue * src_value,
GValue * dest_value)
{
dest_value->data[0].v_double = ((double) src_value->data[0].v_int) /
((double) src_value->data[1].v_int);
}
static int
gst_value_compare_fraction (const GValue * value1, const GValue * value2)
{
gint n1, n2;
gint d1, d2;
gint64 new_num_1;
gint64 new_num_2;
n1 = value1->data[0].v_int;
n2 = value2->data[0].v_int;
d1 = value1->data[1].v_int;
d2 = value2->data[1].v_int;
/* fractions are reduced when set, so we can quickly see if they're equal */
if (n1 == n2 && d1 == d2)
return GST_VALUE_EQUAL;
/* extend to 64 bits */
new_num_1 = ((gint64) n1) * d2;
new_num_2 = ((gint64) n2) * d1;
if (new_num_1 < new_num_2)
return GST_VALUE_LESS_THAN;
if (new_num_1 > new_num_2)
return GST_VALUE_GREATER_THAN;
g_assert_not_reached ();
return GST_VALUE_UNORDERED;
}
/*********
* GDate *
*********/
/**
* gst_value_set_date:
* @value: a GValue initialized to GST_TYPE_DATE
* @date: the date to set the value to
*
* Sets the contents of @value to coorespond to @date. The actual
* #GDate structure is copied before it is used.
*/
void
gst_value_set_date (GValue * value, const GDate * date)
{
g_return_if_fail (G_VALUE_TYPE (value) == GST_TYPE_DATE);
g_value_set_boxed (value, date);
}
/**
* gst_value_get_date:
* @value: a GValue initialized to GST_TYPE_DATE
*
* Gets the contents of @value.
*
* Returns: the contents of @value
*/
const GDate *
gst_value_get_date (const GValue * value)
{
g_return_val_if_fail (G_VALUE_TYPE (value) == GST_TYPE_DATE, NULL);
return (const GDate *) g_value_get_boxed (value);
}
static gpointer
gst_date_copy (gpointer boxed)
{
const GDate *date = (const GDate *) boxed;
return g_date_new_julian (g_date_get_julian (date));
}
static int
gst_value_compare_date (const GValue * value1, const GValue * value2)
{
const GDate *date1 = (const GDate *) g_value_get_boxed (value1);
const GDate *date2 = (const GDate *) g_value_get_boxed (value2);
guint32 j1, j2;
if (date1 == date2)
return GST_VALUE_EQUAL;
if ((date1 == NULL || !g_date_valid (date1))
&& (date2 != NULL && g_date_valid (date2))) {
return GST_VALUE_LESS_THAN;
}
if ((date2 == NULL || !g_date_valid (date2))
&& (date1 != NULL && g_date_valid (date1))) {
return GST_VALUE_GREATER_THAN;
}
if (date1 == NULL || date2 == NULL || !g_date_valid (date1)
|| !g_date_valid (date2)) {
return GST_VALUE_UNORDERED;
}
j1 = g_date_get_julian (date1);
j2 = g_date_get_julian (date2);
if (j1 == j2)
return GST_VALUE_EQUAL;
else if (j1 < j2)
return GST_VALUE_LESS_THAN;
else
return GST_VALUE_GREATER_THAN;
}
static char *
gst_value_serialize_date (const GValue * val)
{
const GDate *date = (const GDate *) g_value_get_boxed (val);
if (date == NULL || !g_date_valid (date))
return g_strdup ("9999-99-99");
return g_strdup_printf ("%04u-%02u-%02u", g_date_get_year (date),
g_date_get_month (date), g_date_get_day (date));
}
static gboolean
gst_value_deserialize_date (GValue * dest, const char *s)
{
guint year, month, day;
if (!s || sscanf (s, "%04u-%02u-%02u", &year, &month, &day) != 3)
return FALSE;
if (!g_date_valid_dmy (day, month, year))
return FALSE;
g_value_take_boxed (dest, g_date_new_dmy (day, month, year));
return TRUE;
}
static void
gst_value_transform_date_string (const GValue * src_value, GValue * dest_value)
{
dest_value->data[0].v_pointer = gst_value_serialize_date (src_value);
}
static void
gst_value_transform_string_date (const GValue * src_value, GValue * dest_value)
{
gst_value_deserialize_date (dest_value, src_value->data[0].v_pointer);
}
void
_gst_value_initialize (void)
{
GTypeInfo info = {
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
NULL,
};
GTypeFundamentalInfo finfo = {
0
};
//const GTypeFundamentalInfo finfo = { G_TYPE_FLAG_DERIVABLE, };
gst_value_table = g_array_new (FALSE, FALSE, sizeof (GstValueTable));
gst_value_union_funcs = g_array_new (FALSE, FALSE,
sizeof (GstValueUnionInfo));
gst_value_intersect_funcs = g_array_new (FALSE, FALSE,
sizeof (GstValueIntersectInfo));
gst_value_subtract_funcs = g_array_new (FALSE, FALSE,
sizeof (GstValueSubtractInfo));
{
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
};
static GstValueTable gst_value = {
0,
gst_value_compare_fourcc,
gst_value_serialize_fourcc,
gst_value_deserialize_fourcc,
};
info.value_table = &value_table;
gst_type_fourcc = g_type_register_fundamental (g_type_fundamental_next (),
"GstFourcc", &info, &finfo, 0);
gst_value.type = gst_type_fourcc;
gst_value_register (&gst_value);
}
{
static const GTypeValueTable value_table = {
gst_value_init_int_range,
NULL,
gst_value_copy_int_range,
NULL,
"ii",
gst_value_collect_int_range,
"pp",
gst_value_lcopy_int_range
};
static GstValueTable gst_value = {
0,
gst_value_compare_int_range,
gst_value_serialize_int_range,
gst_value_deserialize_int_range,
};
info.value_table = &value_table;
gst_type_int_range =
g_type_register_fundamental (g_type_fundamental_next (), "GstIntRange",
&info, &finfo, 0);
gst_value.type = gst_type_int_range;
gst_value_register (&gst_value);
}
{
static const GTypeValueTable value_table = {
gst_value_init_double_range,
NULL,
gst_value_copy_double_range,
NULL,
"dd",
gst_value_collect_double_range,
"pp",
gst_value_lcopy_double_range
};
static GstValueTable gst_value = {
0,
gst_value_compare_double_range,
gst_value_serialize_double_range,
gst_value_deserialize_double_range,
};
info.value_table = &value_table;
gst_type_double_range =
g_type_register_fundamental (g_type_fundamental_next (),
"GstDoubleRange", &info, &finfo, 0);
gst_value.type = gst_type_double_range;
gst_value_register (&gst_value);
}
{
static const GTypeValueTable value_table = {
gst_value_init_list,
gst_value_free_list,
gst_value_copy_list,
gst_value_list_peek_pointer,
"p",
gst_value_collect_list,
"p",
gst_value_lcopy_list
};
static GstValueTable gst_value = {
0,
gst_value_compare_list,
gst_value_serialize_list,
gst_value_deserialize_list,
};
info.value_table = &value_table;
gst_type_list = g_type_register_fundamental (g_type_fundamental_next (),
"GstValueList", &info, &finfo, 0);
gst_value.type = gst_type_list;
gst_value_register (&gst_value);
}
{
static const GTypeValueTable value_table = {
gst_value_init_list,
gst_value_free_list,
gst_value_copy_list,
gst_value_list_peek_pointer,
"p",
gst_value_collect_list,
"p",
gst_value_lcopy_list
};
static GstValueTable gst_value = {
0,
gst_value_compare_list,
gst_value_serialize_array,
gst_value_deserialize_array,
};
info.value_table = &value_table;
gst_type_array =
g_type_register_fundamental (g_type_fundamental_next (),
"GstValueArray", &info, &finfo, 0);
gst_value.type = gst_type_array;
gst_value_register (&gst_value);
}
{
#if 0
static const GTypeValueTable value_table = {
gst_value_init_buffer,
NULL,
gst_value_copy_buffer,
NULL,
"i",
NULL, /*gst_value_collect_buffer, */
"p",
NULL /*gst_value_lcopy_buffer */
};
#endif
static GstValueTable gst_value = {
0,
gst_value_compare_buffer,
gst_value_serialize_buffer,
gst_value_deserialize_buffer,
};
gst_value.type = GST_TYPE_BUFFER;
gst_value_register (&gst_value);
}
{
static const GTypeValueTable value_table = {
gst_value_init_fraction,
NULL,
gst_value_copy_fraction,
NULL,
"ii",
gst_value_collect_fraction,
"pp",
gst_value_lcopy_fraction
};
static GstValueTable gst_value = {
0,
gst_value_compare_fraction,
gst_value_serialize_fraction,
gst_value_deserialize_fraction,
};
info.value_table = &value_table;
gst_type_fraction =
g_type_register_fundamental (g_type_fundamental_next (), "GstFraction",
&info, &finfo, 0);
gst_value.type = gst_type_fraction;
gst_value_register (&gst_value);
}
{
static GstValueTable gst_value = {
0,
NULL,
gst_value_serialize_caps,
gst_value_deserialize_caps,
};
gst_value.type = GST_TYPE_CAPS;
gst_value_register (&gst_value);
}
{
static GstValueTable gst_value = {
0,
gst_value_compare_date,
gst_value_serialize_date,
gst_value_deserialize_date,
};
/* Not using G_TYPE_DATE here on purpose, even if we could
* if GLIB_CHECK_VERSION(2,8,0) was true: we don't want the
* serialised strings to have different type strings depending
* on what version is used, so FIXME in 0.11 when we
* require GLib-2.8 */
gst_type_date = g_boxed_type_register_static ("GstDate",
(GBoxedCopyFunc) gst_date_copy, (GBoxedFreeFunc) g_date_free);
gst_value.type = gst_type_date;
gst_value_register (&gst_value);
}
REGISTER_SERIALIZATION (G_TYPE_DOUBLE, double);
REGISTER_SERIALIZATION (G_TYPE_FLOAT, float);
REGISTER_SERIALIZATION (G_TYPE_STRING, string);
REGISTER_SERIALIZATION (G_TYPE_BOOLEAN, boolean);
REGISTER_SERIALIZATION (G_TYPE_ENUM, enum);
REGISTER_SERIALIZATION (G_TYPE_FLAGS, flags);
REGISTER_SERIALIZATION (G_TYPE_INT, int);
REGISTER_SERIALIZATION (G_TYPE_INT64, int64);
REGISTER_SERIALIZATION (G_TYPE_LONG, long);
REGISTER_SERIALIZATION (G_TYPE_UINT, uint);
REGISTER_SERIALIZATION (G_TYPE_UINT64, uint64);
REGISTER_SERIALIZATION (G_TYPE_ULONG, ulong);
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);
g_value_register_transform_func (GST_TYPE_DOUBLE_RANGE, G_TYPE_STRING,
gst_value_transform_double_range_string);
g_value_register_transform_func (GST_TYPE_LIST, G_TYPE_STRING,
gst_value_transform_list_string);
g_value_register_transform_func (GST_TYPE_ARRAY, G_TYPE_STRING,
gst_value_transform_array_string);
g_value_register_transform_func (GST_TYPE_FRACTION, G_TYPE_STRING,
gst_value_transform_fraction_string);
g_value_register_transform_func (G_TYPE_STRING, GST_TYPE_FRACTION,
gst_value_transform_string_fraction);
g_value_register_transform_func (GST_TYPE_FRACTION, G_TYPE_DOUBLE,
gst_value_transform_fraction_double);
g_value_register_transform_func (G_TYPE_DOUBLE, GST_TYPE_FRACTION,
gst_value_transform_double_fraction);
g_value_register_transform_func (GST_TYPE_DATE, G_TYPE_STRING,
gst_value_transform_date_string);
g_value_register_transform_func (G_TYPE_STRING, GST_TYPE_DATE,
gst_value_transform_string_date);
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);
gst_value_register_intersect_func (G_TYPE_DOUBLE, GST_TYPE_DOUBLE_RANGE,
gst_value_intersect_double_double_range);
gst_value_register_intersect_func (GST_TYPE_DOUBLE_RANGE,
GST_TYPE_DOUBLE_RANGE, gst_value_intersect_double_range_double_range);
gst_value_register_intersect_func (GST_TYPE_ARRAY,
GST_TYPE_ARRAY, gst_value_intersect_array);
gst_value_register_subtract_func (G_TYPE_INT, GST_TYPE_INT_RANGE,
gst_value_subtract_int_int_range);
gst_value_register_subtract_func (GST_TYPE_INT_RANGE, G_TYPE_INT,
gst_value_subtract_int_range_int);
gst_value_register_subtract_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE,
gst_value_subtract_int_range_int_range);
gst_value_register_subtract_func (G_TYPE_DOUBLE, GST_TYPE_DOUBLE_RANGE,
gst_value_subtract_double_double_range);
gst_value_register_subtract_func (GST_TYPE_DOUBLE_RANGE, G_TYPE_DOUBLE,
gst_value_subtract_double_range_double);
gst_value_register_subtract_func (GST_TYPE_DOUBLE_RANGE,
GST_TYPE_DOUBLE_RANGE, gst_value_subtract_double_range_double_range);
gst_value_register_union_func (G_TYPE_INT, GST_TYPE_INT_RANGE,
gst_value_union_int_int_range);
gst_value_register_union_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE,
gst_value_union_int_range_int_range);
}
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