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API Changes.

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Original commit message from CVS:
* gst/gststructure.c: (gst_structure_get_fraction),
(gst_structure_parse_value),
(gst_structure_fixate_field_nearest_fraction):
* gst/gststructure.h:
* gst/gstutils.c: (gst_util_uint64_scale_int):
* gst/gstutils.h:
* scripts/update-funcnames:
API Changes.
Rename gst_util_clock_time_scale to gst_util_uint64_scale_int
Make gst_structure_fixate_field_nearest_fraction take a numerator
and denominator argument instead of a GValue
add gst_structure_get_fraction helper function.
This commit is contained in:
Jan Schmidt 2005-11-23 13:22:21 +00:00
parent 9e0575c379
commit cfc78f21ec
6 changed files with 98 additions and 22 deletions
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15
ChangeLog
View file

@ -1,3 +1,18 @@
2005-11-23 Jan Schmidt <thaytan@mad.scientist.com>
* gst/gststructure.c: (gst_structure_get_fraction),
(gst_structure_parse_value),
(gst_structure_fixate_field_nearest_fraction):
* gst/gststructure.h:
* gst/gstutils.c: (gst_util_uint64_scale_int):
* gst/gstutils.h:
* scripts/update-funcnames:
API Changes.
Rename gst_util_clock_time_scale to gst_util_uint64_scale_int
Make gst_structure_fixate_field_nearest_fraction take a numerator
and denominator argument instead of a GValue
add gst_structure_get_fraction helper function.
2005-11-23 Wim Taymans <wim@fluendo.com>
* docs/design/part-TODO.txt:

89
gst/gststructure.c
View file

@ -1169,6 +1169,45 @@ gst_structure_get_enum (const GstStructure * structure,
return TRUE;
}
/**
* gst_structure_get_fraction:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value_numerator: a pointer to an int to set
* @value_denominator: a pointer to an int to set
*
* Sets the integers pointed to by @value_numerator and @value_denominator
* corresponding to the value of the given field. Caller is responsible
* for making sure the field exists and has the correct type.
*
* Returns: TRUE if the values could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a GstFraction, this
* function returns FALSE.
*/
gboolean
gst_structure_get_fraction (const GstStructure * structure,
const gchar * fieldname, gint * value_numerator, gint * value_denominator)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value_numerator != NULL, FALSE);
g_return_val_if_fail (value_denominator != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!GST_VALUE_HOLDS_FRACTION (&field->value))
return FALSE;
*value_numerator = gst_value_get_fraction_numerator (&field->value);
*value_denominator = gst_value_get_fraction_denominator (&field->value);
return TRUE;
}
typedef struct _GstStructureAbbreviation
{
char *type_name;
@ -1936,22 +1975,24 @@ gst_structure_fixate_field_boolean (GstStructure * structure,
* gst_structure_fixate_field_nearest_fraction:
* @structure: a #GstStructure
* @field_name: a field in @structure
* @target: A GValue of GST_TYPE_FRACTION with the target value of the fixation
* @target_numerator: The numerator of the target value of the fixation
* @target_denominator: The denominator of the target value of the fixation
*
* Fixates a #GstStructure by changing the given field to the nearest
* fraction to @target that is a subset of the existing field.
* fraction to @target_numerator/@target_denominator that is a subset
* of the existing field.
*
* Returns: TRUE if the structure could be fixated
*/
gboolean
gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
const char *field_name, const GValue * target)
const char *field_name, const gint target_numerator,
const gint target_denominator)
{
const GValue *value;
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
g_return_val_if_fail (G_VALUE_TYPE (target) == GST_TYPE_FRACTION, FALSE);
value = gst_structure_get_value (structure, field_name);
@ -1959,25 +2000,36 @@ gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION_RANGE) {
const GValue *x;
const GValue *x, *new_value;
GValue target = { 0 };
g_value_init (&target, GST_TYPE_FRACTION);
gst_value_set_fraction (&target, target_numerator, target_denominator);
new_value = &target;
x = gst_value_get_fraction_range_min (value);
if (gst_value_compare (target, x) == GST_VALUE_LESS_THAN)
target = x;
if (gst_value_compare (&target, x) == GST_VALUE_LESS_THAN)
new_value = x;
x = gst_value_get_fraction_range_max (value);
if (gst_value_compare (target, x) == GST_VALUE_GREATER_THAN)
target = x;
gst_structure_set_value (structure, field_name, target);
if (gst_value_compare (&target, x) == GST_VALUE_GREATER_THAN)
new_value = x;
gst_structure_set_value (structure, field_name, new_value);
g_value_unset (&target);
return TRUE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
const GValue *best = NULL;
GValue best_diff;
GValue cur_diff;
GValue best_diff = { 0 };
GValue cur_diff = { 0 };
GValue target = { 0 };
gboolean res = FALSE;
g_value_init (&best_diff, GST_TYPE_FRACTION);
g_value_init (&cur_diff, GST_TYPE_FRACTION);
g_value_init (&target, GST_TYPE_FRACTION);
gst_value_set_fraction (&target, target_numerator, target_denominator);
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
@ -1987,10 +2039,10 @@ gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
best = list_value;
gst_value_set_fraction (&best_diff, 0, 1);
} else {
if (gst_value_compare (list_value, target) == GST_VALUE_LESS_THAN)
gst_value_fraction_subtract (&cur_diff, target, list_value);
if (gst_value_compare (list_value, &target) == GST_VALUE_LESS_THAN)
gst_value_fraction_subtract (&cur_diff, &target, list_value);
else
gst_value_fraction_subtract (&cur_diff, list_value, target);
gst_value_fraction_subtract (&cur_diff, list_value, &target);
if (gst_value_compare (&cur_diff, &best_diff) == GST_VALUE_LESS_THAN) {
best = list_value;
@ -2001,9 +2053,12 @@ gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
}
if (best != NULL) {
gst_structure_set_value (structure, field_name, best);
return TRUE;
res = TRUE;
}
return FALSE;
g_value_unset (&best_diff);
g_value_unset (&cur_diff);
g_value_unset (&target);
return res;
}
return FALSE;

7
gst/gststructure.h
View file

@ -174,6 +174,10 @@ gboolean gst_structure_get_enum (const GstStructure
const gchar *fieldname,
GType enumtype,
gint *value);
gboolean gst_structure_get_fraction (const GstStructure *structure,
const gchar *fieldname,
gint *value_numerator,
gint *value_denominator);
gchar * gst_structure_to_string (const GstStructure *structure);
GstStructure * gst_structure_from_string (const gchar *string,
@ -191,7 +195,8 @@ gboolean gst_structure_fixate_field_boolean (GstStructure *struc
gboolean target);
gboolean gst_structure_fixate_field_nearest_fraction (GstStructure *structure,
const char *field_name,
const GValue *target);
const gint target_numerator,
const gint target_denominator);
G_END_DECLS

6
gst/gstutils.c
View file

@ -359,7 +359,7 @@ gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
}
/**
* gst_util_clock_time_scale:
* gst_util_uint64_scale_int:
* @val: GstClockTime to scale.
* @num: numerator of the scale factor.
* @denom: denominator of the scale factor.
@ -369,8 +369,8 @@ gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
*
* Returns: @val * @num / @denom, avoiding overflow and loss of precision
*/
GstClockTime
gst_util_clock_time_scale (GstClockTime val, gint num, gint denom)
guint64
gst_util_uint64_scale_int (guint64 val, gint num, gint denom)
{
return val * num / denom;
}

2
gst/gstutils.h
View file

@ -43,7 +43,7 @@ gdouble gst_guint64_to_gdouble (guint64 value);
guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom);
GstClockTime gst_util_clock_time_scale (GstClockTime val, gint num, gint denom);
guint64 gst_util_uint64_scale_int (guint64 val, gint num, gint denom);
void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad);
void gst_print_element_args (GString *buf, gint indent, GstElement *element);

1
scripts/update-funcnames
View file

@ -26,3 +26,4 @@ subst gst_ghost_pad_new_notarget gst_ghost_pad_new_no_target
subst gst_tag_setter_merge gst_tag_setter_merge_tags
subst gst_tag_setter_get_list gst_tag_setter_get_tag_list
subst gst_tag_setter_get_merge_mode gst_tag_setter_get_tag_merge_mode
subst gst_util_clock_time_scale gst_util_uint64_scale_int