Commit 2e1f1ead authored by Matthew Waters's avatar Matthew Waters 🐨 Committed by Sebastian Dröge

tags: add dynamic tag retrieval based on string's and Value's

The rust compiler won't complain if you use the wrong types with the
dynamic getter/adder however GStreamer itself does.
parent fa054fe3
......@@ -188,6 +188,23 @@ impl TagListRef {
}
}
pub fn add_dynamic<'a, T>(&'a mut self, tag_name : &str, value: &T, mode: TagMergeMode)
where
T: ToSendValue
{
/* TODO: implement limiting values for tags? */
unsafe {
let v = value.to_send_value();
ffi::gst_tag_list_add_value(
self.as_mut_ptr(),
mode.to_glib(),
tag_name.to_glib_none().0,
v.to_glib_none().0,
);
}
}
pub fn get<'a, T: Tag<'a>>(&self) -> Option<TypedValue<T::TagType>> {
unsafe {
let mut value: Value = mem::zeroed();
......@@ -206,6 +223,34 @@ impl TagListRef {
}
}
pub fn n_tags<'a>(&'a self) -> i32 {
unsafe { ffi::gst_tag_list_n_tags(self.as_ptr()) }
}
pub fn nth_tag<'a>(&'a self, idx: u32) -> &str {
unsafe { CStr::from_ptr(ffi::gst_tag_list_nth_tag_name(self.as_ptr(), idx)).to_str().unwrap() }
}
pub fn get_size_dynamic<'a>(&'a self, tag_name: &str) -> u32 {
unsafe { ffi::gst_tag_list_get_tag_size(self.as_ptr(), tag_name.to_glib_none().0) }
}
pub fn get_index_dynamic<'a>(&'a self, tag_name: &str, idx: u32) -> Option<&'a Value> {
unsafe {
let value = ffi::gst_tag_list_get_value_index(
self.as_ptr(),
tag_name.to_glib_none().0,
idx,
);
if value.is_null() {
return None;
}
Some(&*(value as *const Value))
}
}
pub fn get_index<'a, T: Tag<'a>>(&'a self, idx: u32) -> Option<&'a TypedValue<T::TagType>> {
unsafe {
let value = ffi::gst_tag_list_get_value_index(
......@@ -400,4 +445,21 @@ mod tests {
(::SECOND * 120)
);
}
#[test]
fn test_dynamic() {
::init().unwrap();
let mut tags = TagList::new();
{
let tags = tags.get_mut().unwrap();
tags.add_dynamic(&TAG_TITLE, &"some title", TagMergeMode::Append);
tags.add_dynamic(&TAG_TITLE, &"second title", TagMergeMode::Append);
tags.add_dynamic(&TAG_DURATION, &(::SECOND * 120), TagMergeMode::Append);
}
assert_eq!(tags.get_index_dynamic(&TAG_TITLE, 0).unwrap().get(), Some("some title"));
assert_eq!(tags.get_index_dynamic(&TAG_TITLE, 1).unwrap().get(), Some("second title"));
assert_eq!(tags.get_index_dynamic(&TAG_DURATION, 0).unwrap().get(), Some(::SECOND * 120));
}
}
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