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gststructure: Add gst_structure_can_intersect API

Browse source 
Allows checking if two structures can intersect without having to
go through GstCaps

API: gst_structure_can_intersect

https://bugzilla.gnome.org/show_bug.cgi?id=629300
This commit is contained in:
Edward Hervey 2010-09-10 18:33:34 +02:00 committed by Sebastian Dröge
parent ae46eb3a38
commit 64725facb5
5 changed files with 64 additions and 47 deletions
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1
docs/gst/gstreamer-sections.txt
View file

@ -2210,6 +2210,7 @@ gst_structure_n_fields
gst_structure_has_field
gst_structure_has_field_typed
gst_structure_is_equal
gst_structure_can_intersect
gst_structure_id_has_field
gst_structure_id_has_field_typed
gst_structure_get_boolean

48
gst/gstcaps.c
View file

@ -1265,52 +1265,6 @@ error:
return NULL;
}
static gboolean
gst_caps_structure_can_intersect_field (GQuark id, const GValue * val1,
gpointer data)
{
GstStructure *other = (GstStructure *) data;
const GValue *val2 = gst_structure_id_get_value (other, id);
if (G_LIKELY (val2)) {
if (!gst_value_can_intersect (val1, val2)) {
return FALSE;
} else {
gint eq = gst_value_compare (val1, val2);
if (eq == GST_VALUE_UNORDERED) {
/* we need to try interseting */
GValue dest_value = { 0 };
if (gst_value_intersect (&dest_value, val1, val2)) {
g_value_unset (&dest_value);
} else {
return FALSE;
}
} else if (eq != GST_VALUE_EQUAL) {
return FALSE;
}
}
}
return TRUE;
}
static gboolean
gst_caps_structure_can_intersect (const GstStructure * struct1,
const GstStructure * struct2)
{
g_assert (struct1 != NULL);
g_assert (struct2 != NULL);
if (G_UNLIKELY (struct1->name != struct2->name))
return FALSE;
/* tries to intersect if we have the field in both */
if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct1,
gst_caps_structure_can_intersect_field, (gpointer) struct2)))
return FALSE;
return TRUE;
}
/**
* gst_caps_can_intersect:
@ -1379,7 +1333,7 @@ gst_caps_can_intersect (const GstCaps * caps1, const GstCaps * caps2)
struct1 = gst_caps_get_structure_unchecked (caps1, j);
struct2 = gst_caps_get_structure_unchecked (caps2, k);
if (gst_caps_structure_can_intersect (struct1, struct2)) {
if (gst_structure_can_intersect (struct1, struct2)) {
return TRUE;
}
/* move down left */

59
gst/gststructure.c
View file

@ -2961,3 +2961,62 @@ gst_structure_is_equal (const GstStructure * structure1,
return gst_structure_foreach (structure1, gst_structure_is_equal_foreach,
structure2);
}
static gboolean
gst_caps_structure_can_intersect_field (GQuark id, const GValue * val1,
gpointer data)
{
GstStructure *other = (GstStructure *) data;
const GValue *val2 = gst_structure_id_get_value (other, id);
if (G_LIKELY (val2)) {
if (!gst_value_can_intersect (val1, val2)) {
return FALSE;
} else {
gint eq = gst_value_compare (val1, val2);
if (eq == GST_VALUE_UNORDERED) {
/* we need to try interseting */
GValue dest_value = { 0 };
if (gst_value_intersect (&dest_value, val1, val2)) {
g_value_unset (&dest_value);
} else {
return FALSE;
}
} else if (eq != GST_VALUE_EQUAL) {
return FALSE;
}
}
}
return TRUE;
}
/**
* gst_structure_can_intersect:
* @struct1: a #GstStructure
* @struct2: a #GstStructure
*
* Tries interesecting @struct1 and @struct2 and reports whether the result
* would not be empty.
*
* Returns: %TRUE if intersection would not be empty
*
* Since: 0.10.31
*/
gboolean
gst_structure_can_intersect (const GstStructure * struct1,
const GstStructure * struct2)
{
g_return_val_if_fail (GST_IS_STRUCTURE (struct1), FALSE);
g_return_val_if_fail (GST_IS_STRUCTURE (struct2), FALSE);
if (G_UNLIKELY (struct1->name != struct2->name))
return FALSE;
/* tries to intersect if we have the field in both */
if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct1,
gst_caps_structure_can_intersect_field, (gpointer) struct2)))
return FALSE;
return TRUE;
}

2
gst/gststructure.h
View file

@ -250,6 +250,8 @@ gboolean gst_structure_fixate_field_nearest_fraction (GstStructu
gboolean gst_structure_is_equal(const GstStructure *structure1,
GstStructure *structure2);
gboolean gst_structure_can_intersect(const GstStructure *struct1,
const GstStructure *struct2);
G_END_DECLS

1
win32/common/libgstreamer.def
View file

@ -964,6 +964,7 @@ EXPORTS
gst_stream_error_get_type
gst_stream_error_quark
gst_stream_status_type_get_type
gst_structure_can_intersect
gst_structure_change_type_get_type
gst_structure_copy
gst_structure_empty_new