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caps: Add gst_caps_foreach() and gst_caps_map_in_place()

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=739765
This commit is contained in:
Sebastian Dröge 2014-11-07 11:15:09 +01:00
parent f3494d09d4
commit bc11a1b79d
4 changed files with 218 additions and 0 deletions
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5
docs/gst/gstreamer-sections.txt
View file

@ -398,6 +398,9 @@ GST_CAPS_FLAG_IS_SET
GST_CAPS_FLAG_SET
GST_CAPS_FLAG_UNSET
GstCapsForeachFunc
GstCapsMapFunc
gst_caps_new_empty
gst_caps_new_empty_simple
gst_caps_new_any
@ -424,6 +427,8 @@ gst_caps_set_features
gst_caps_set_value
gst_caps_set_simple
gst_caps_set_simple_valist
gst_caps_foreach
gst_caps_map_in_place
gst_caps_is_any
gst_caps_is_empty
gst_caps_is_fixed

89
gst/gstcaps.c
View file

@ -2358,3 +2358,92 @@ gst_caps_transform_to_string (const GValue * src_value, GValue * dest_value)
g_value_take_string (dest_value,
gst_caps_to_string (gst_value_get_caps (src_value)));
}
/**
* gst_caps_foreach:
* @caps: a #GstCaps
* @func: (scope call): a function to call for each field
* @user_data: (closure): private data
*
* Calls the provided function once for each structure and caps feature in the
* #GstCaps. The function must not modify the fields.
* Also see gst_caps_map_in_place().
*
* Returns: %TRUE if the supplied function returns %TRUE for each call,
* %FALSE otherwise.
*
* Since: 1.6
*/
gboolean
gst_caps_foreach (const GstCaps * caps, GstCapsForeachFunc func,
gpointer user_data)
{
guint i, n;
GstCapsFeatures *features;
GstStructure *structure;
gboolean ret;
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (func != NULL, FALSE);
n = GST_CAPS_LEN (caps);
for (i = 0; i < n; i++) {
features = gst_caps_get_features_unchecked (caps, i);
structure = gst_caps_get_structure_unchecked (caps, i);
ret = func (features, structure, user_data);
if (G_UNLIKELY (!ret))
return FALSE;
}
return TRUE;
}
/**
* gst_caps_map_in_place:
* @caps: a #GstCaps
* @func: (scope call): a function to call for each field
* @user_data: (closure): private data
*
* Calls the provided function once for each structure and caps feature in the
* #GstCaps. In contrast to gst_caps_foreach(), the function may modify but not
* delete the structures and features. The caps must be mutable.
*
* Returns: %TRUE if the supplied function returns %TRUE for each call,
* %FALSE otherwise.
*
* Since: 1.6
*/
gboolean
gst_caps_map_in_place (GstCaps * caps, GstCapsMapFunc func, gpointer user_data)
{
guint i, n;
GstCapsFeatures *features;
GstStructure *structure;
gboolean ret;
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (gst_caps_is_writable (caps), FALSE);
g_return_val_if_fail (func != NULL, FALSE);
n = GST_CAPS_LEN (caps);
for (i = 0; i < n; i++) {
features = gst_caps_get_features_unchecked (caps, i);
structure = gst_caps_get_structure_unchecked (caps, i);
/* Provide sysmem features if there are none yet */
if (!features) {
features =
gst_caps_features_copy (GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY);
gst_caps_set_features (caps, i, features);
}
ret = func (features, structure, user_data);
if (G_UNLIKELY (!ret))
return FALSE;
}
return TRUE;
}

43
gst/gstcaps.h
View file

@ -363,6 +363,41 @@ struct _GstStaticCaps {
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstCapsForeachFunc:
* @features: the #GstCapsFeatures
* @structure: the #GstStructure
* @user_data: user data
*
* A function that will be called in gst_caps_foreach(). The function may
* not modify @features or @structure.
*
* Returns: %TRUE if the foreach operation should continue, %FALSE if
* the foreach operation should stop with %FALSE.
*
* Since: 1.6
*/
typedef gboolean (*GstCapsForeachFunc) (GstCapsFeatures *features,
GstStructure *structure,
gpointer user_data);
/**
* GstCapsMapFunc:
* @features: the #GstCapsFeatures
* @structure: the #GstStructure
* @user_data: user data
*
* A function that will be called in gst_caps_map_in_place(). The function
* may modify @features and @structure.
*
* Returns: %TRUE if the map operation should continue, %FALSE if
* the map operation should stop with %FALSE.
*/
typedef gboolean (*GstCapsMapFunc) (GstCapsFeatures *features,
GstStructure *structure,
gpointer user_data);
GType gst_caps_get_type (void);
GstCaps * gst_caps_new_empty (void);
@ -417,6 +452,14 @@ void gst_caps_set_simple_valist (GstCaps *caps,
const char *field,
va_list varargs);
gboolean gst_caps_foreach (const GstCaps *caps,
GstCapsForeachFunc func,
gpointer user_data);
gboolean gst_caps_map_in_place (GstCaps *caps,
GstCapsMapFunc func,
gpointer user_data);
/* tests */
gboolean gst_caps_is_any (const GstCaps *caps);
gboolean gst_caps_is_empty (const GstCaps *caps);

81
tests/check/gst/gstcaps.c
View file

@ -1161,6 +1161,85 @@ GST_START_TEST (test_special_caps)
}
GST_END_TEST;
static gboolean
foreach_append_function (GstCapsFeatures * features, GstStructure * structure,
gpointer user_data)
{
GstCaps *caps = user_data;
gst_caps_append_structure_full (caps, gst_structure_copy (structure),
features ? gst_caps_features_copy (features) : NULL);
return TRUE;
}
GST_START_TEST (test_foreach)
{
GstCaps *caps, *caps2;
caps =
gst_caps_from_string
("video/x-raw, format=I420; video/x-raw(foo:bar); video/x-h264");
caps2 = gst_caps_new_empty ();
fail_unless (gst_caps_foreach (caps, foreach_append_function, caps2));
fail_unless (gst_caps_is_strictly_equal (caps, caps2));
gst_caps_unref (caps);
gst_caps_unref (caps2);
caps = gst_caps_new_empty ();
caps2 = gst_caps_new_empty ();
fail_unless (gst_caps_foreach (caps, foreach_append_function, caps2));
fail_unless (gst_caps_is_strictly_equal (caps, caps2));
gst_caps_unref (caps);
gst_caps_unref (caps2);
}
GST_END_TEST;
static gboolean
map_function (GstCapsFeatures * features, GstStructure * structure,
gpointer user_data)
{
/* Remove caps features if there are any, otherwise add some dummy */
if (gst_caps_features_contains (features, "foo:bar")) {
gst_caps_features_remove (features, "foo:bar");
} else {
gst_caps_features_add (features, "foo:bar");
gst_caps_features_remove (features, GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
}
/* Set some dummy integer in the structure */
gst_structure_set (structure, "foo", G_TYPE_INT, 123, NULL);
return TRUE;
}
GST_START_TEST (test_map_in_place)
{
GstCaps *caps, *caps2;
caps =
gst_caps_from_string
("video/x-raw, format=I420; video/x-raw(foo:bar); video/x-h264");
caps2 =
gst_caps_from_string
("video/x-raw(foo:bar), foo=(int)123, format=I420; video/x-raw, foo=(int)123; video/x-h264(foo:bar), foo=(int)123");
fail_unless (gst_caps_map_in_place (caps, map_function, NULL));
fail_unless (gst_caps_is_strictly_equal (caps, caps2));
gst_caps_unref (caps);
gst_caps_unref (caps2);
caps = gst_caps_new_empty ();
caps2 = gst_caps_new_empty ();
fail_unless (gst_caps_map_in_place (caps, map_function, NULL));
fail_unless (gst_caps_is_strictly_equal (caps, caps2));
gst_caps_unref (caps);
gst_caps_unref (caps2);
}
GST_END_TEST;
static Suite *
gst_caps_suite (void)
{
@ -1190,6 +1269,8 @@ gst_caps_suite (void)
tcase_add_test (tc_chain, test_broken);
tcase_add_test (tc_chain, test_features);
tcase_add_test (tc_chain, test_special_caps);
tcase_add_test (tc_chain, test_foreach);
tcase_add_test (tc_chain, test_map_in_place);
return s;
}