#[non_exhaustive]pub enum H265TemporalIds {
Disabled,
Enabled,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against H265TemporalIds
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let h265temporalids = unimplemented!();
match h265temporalids {
H265TemporalIds::Disabled => { /* ... */ },
H265TemporalIds::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when h265temporalids
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant H265TemporalIds::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
H265TemporalIds::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant H265TemporalIds::NewFeature
is defined.
Specifically, when h265temporalids
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on H265TemporalIds::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms. Enables temporal layer identifiers in the encoded bitstream. Up to 3 layers are supported depending on GOP structure: I- and P-frames form one layer, reference B-frames can form a second layer and non-reference b-frames can form a third layer. Decoders can optionally decode only the lower temporal layers to generate a lower frame rate output. For example, given a bitstream with temporal IDs and with b-frames = 1 (i.e. IbPbPb display order), a decoder could decode all the frames for full frame rate output or only the I and P frames (lowest temporal layer) for a half frame rate output.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Disabled
Enabled
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl H265TemporalIds
impl H265TemporalIds
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for H265TemporalIds
impl AsRef<str> for H265TemporalIds
source§impl Clone for H265TemporalIds
impl Clone for H265TemporalIds
source§fn clone(&self) -> H265TemporalIds
fn clone(&self) -> H265TemporalIds
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for H265TemporalIds
impl Debug for H265TemporalIds
source§impl Display for H265TemporalIds
impl Display for H265TemporalIds
source§impl From<&str> for H265TemporalIds
impl From<&str> for H265TemporalIds
source§impl FromStr for H265TemporalIds
impl FromStr for H265TemporalIds
source§impl Hash for H265TemporalIds
impl Hash for H265TemporalIds
source§impl Ord for H265TemporalIds
impl Ord for H265TemporalIds
source§fn cmp(&self, other: &H265TemporalIds) -> Ordering
fn cmp(&self, other: &H265TemporalIds) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for H265TemporalIds
impl PartialEq for H265TemporalIds
source§fn eq(&self, other: &H265TemporalIds) -> bool
fn eq(&self, other: &H265TemporalIds) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for H265TemporalIds
impl PartialOrd for H265TemporalIds
source§fn partial_cmp(&self, other: &H265TemporalIds) -> Option<Ordering>
fn partial_cmp(&self, other: &H265TemporalIds) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for H265TemporalIds
impl StructuralPartialEq for H265TemporalIds
Auto Trait Implementations§
impl Freeze for H265TemporalIds
impl RefUnwindSafe for H265TemporalIds
impl Send for H265TemporalIds
impl Sync for H265TemporalIds
impl Unpin for H265TemporalIds
impl UnwindSafe for H265TemporalIds
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more