mirrors/gstreamer-rs
mirrors/gstreamer-rs
1
1
Fork 1
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git synced 2025-09-01 17:33:50 +00:00
Code Issues Projects Releases Wiki Activity

gstreamer: caps: implement Hash

Browse source 
Can be useful to store Caps in HashMap for example.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1639>
This commit is contained in:
Guillaume Desmottes 2025-02-04 10:19:10 +01:00
parent 68280c1dae
commit 28a5c9229f
1 changed files with 83 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

83
gstreamer/src/caps.rs
View file

@ -1259,6 +1259,30 @@ impl PartialEq for CapsRef {
impl Eq for CapsRef {}
#[cfg(feature = "v1_28")]
impl std::hash::Hash for CapsRef {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
if self.is_any() {
"ANY".hash(state);
} else if self.is_empty() {
"EMPTY".hash(state);
} else {
// do no sort as structure order matters
for (s, feature) in self.iter_with_features() {
s.hash(state);
feature.hash(state);
}
}
}
}
#[cfg(feature = "v1_28")]
impl std::hash::Hash for Caps {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.as_ref().hash(state);
}
}
pub enum NoFeature {}
pub enum HasFeatures {}
@ -1761,4 +1785,63 @@ mod tests {
assert_eq!(format!("{caps:?}"), "Caps(video/x-raw(memory:SystemMemory) { array: Array([(gchararray) \"a\", (gchararray) \"b\", (gchararray) \"c\"]), list: List([(gchararray) \"d\", (gchararray) \"e\", (gchararray) \"f\"]) })");
}
#[cfg(feature = "v1_28")]
#[test]
fn test_hash() {
crate::init().unwrap();
use std::hash::BuildHasher;
let bh = std::hash::RandomState::new();
let caps = Caps::builder("video/x-raw").build();
assert_eq!(bh.hash_one(&caps), bh.hash_one(&caps));
let caps_any = Caps::new_any();
let caps_empty = Caps::new_empty();
assert_eq!(bh.hash_one(&caps_any), bh.hash_one(&caps_any));
assert_eq!(bh.hash_one(&caps_empty), bh.hash_one(&caps_empty));
assert_ne!(bh.hash_one(&caps_any), bh.hash_one(&caps_empty));
// Same caps but fields in a different order
let caps_a = Caps::builder("video/x-raw")
.field("width", 1920u32)
.field("height", 1080u32)
.build();
let caps_b = Caps::builder("video/x-raw")
.field("height", 1080u32)
.field("width", 1920u32)
.build();
assert_eq!(bh.hash_one(&caps_a), bh.hash_one(&caps_a));
assert_eq!(bh.hash_one(&caps_b), bh.hash_one(&caps_b));
assert_eq!(bh.hash_one(&caps_a), bh.hash_one(&caps_b));
// Same fields but different feature
let caps_a = Caps::builder("video/x-raw")
.features(["memory:DMABuf"])
.field("width", 1920u32)
.field("height", 1080u32)
.build();
let caps_b = Caps::builder("video/x-raw")
.features(["memory:GLMemory"])
.field("height", 1080u32)
.field("width", 1920u32)
.build();
assert_eq!(bh.hash_one(&caps_a), bh.hash_one(&caps_a));
assert_eq!(bh.hash_one(&caps_b), bh.hash_one(&caps_b));
assert_ne!(bh.hash_one(&caps_a), bh.hash_one(&caps_b));
// Caps have the same structures but in different order, so they are actually different
let caps_a = Caps::builder_full()
.structure(Structure::builder("audio/x-raw").build())
.structure(Structure::builder("video/x-raw").build())
.build();
let caps_b = Caps::builder_full()
.structure(Structure::builder("video/x-raw").build())
.structure(Structure::builder("audio/x-raw").build())
.build();
assert_eq!(bh.hash_one(&caps_a), bh.hash_one(&caps_a));
assert_eq!(bh.hash_one(&caps_b), bh.hash_one(&caps_b));
assert_ne!(bh.hash_one(&caps_a), bh.hash_one(&caps_b));
}
}