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gststructure: Add gst_structure_get_flags method

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We don't prevent setting G_TYPE_FLAGS on GstStructure
but no helper method for getting the value.
Add a method similar to gst_structure_get_enum()

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2770>
This commit is contained in:
Seungha Yang 2022-07-19 04:05:55 +09:00
parent 205034dea9
commit 43052fabb5
3 changed files with 64 additions and 0 deletions
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40
subprojects/gstreamer/gst/gststructure.c
View file

@ -3476,3 +3476,43 @@ gst_structure_set_list (GstStructure * structure, const gchar * fieldname,
{
_gst_structure_set_any_list (structure, GST_TYPE_LIST, fieldname, array);
}
/**
* gst_structure_get_flags:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @flags_type: the flags type of a field
* @value: (out): a pointer to an unsigned int to set
*
* Sets the unsigned int pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists,
* has the correct type and that the flagstype is correct.
*
* Returns: %TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain flags or
* did not contain flags of the given type, this function returns %FALSE.
*
* Since: 1.22
*/
gboolean
gst_structure_get_flags (const GstStructure * structure,
const gchar * fieldname, GType flags_type, guint * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (flags_type != G_TYPE_INVALID, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, flags_type))
return FALSE;
*value = g_value_get_flags (&field->value);
return TRUE;
}

7
subprojects/gstreamer/gst/gststructure.h
View file

@ -342,6 +342,13 @@ GST_API
gboolean gst_structure_get_list (GstStructure * structure,
const gchar * fieldname,
GValueArray ** array);
GST_API
gboolean gst_structure_get_flags (const GstStructure * structure,
const gchar * fieldname,
GType flags_type,
guint * value);
GST_API
gchar * gst_structure_to_string (const GstStructure * structure) G_GNUC_MALLOC;
GST_API

17
subprojects/gstreamer/tests/check/gst/gststructure.c
View file

@ -1018,6 +1018,22 @@ GST_START_TEST (test_flagset)
GST_END_TEST;
GST_START_TEST (test_flags)
{
GstStructure *s;
GstSeekFlags flags = GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT;
guint parsed_flags = 0;
s = gst_structure_new ("test-struct", "test-seek-flags",
GST_TYPE_SEEK_FLAGS, flags, NULL);
fail_unless (gst_structure_get_flags (s, "test-seek-flags",
GST_TYPE_SEEK_FLAGS, &parsed_flags));
fail_unless (flags == (GstSeekFlags) parsed_flags);
gst_structure_free (s);
}
GST_END_TEST;
static Suite *
gst_structure_suite (void)
{
@ -1050,6 +1066,7 @@ gst_structure_suite (void)
tcase_add_test (tc_chain, test_map_in_place);
tcase_add_test (tc_chain, test_filter_and_map_in_place);
tcase_add_test (tc_chain, test_flagset);
tcase_add_test (tc_chain, test_flags);
return s;
}