#[non_exhaustive]pub enum HlsAudioTrackType {
AlternateAudioAutoSelect,
AlternateAudioAutoSelectDefault,
AlternateAudioNotAutoSelect,
AudioOnlyVariantStream,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against HlsAudioTrackType
, 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 hlsaudiotracktype = unimplemented!();
match hlsaudiotracktype {
HlsAudioTrackType::AlternateAudioAutoSelect => { /* ... */ },
HlsAudioTrackType::AlternateAudioAutoSelectDefault => { /* ... */ },
HlsAudioTrackType::AlternateAudioNotAutoSelect => { /* ... */ },
HlsAudioTrackType::AudioOnlyVariantStream => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when hlsaudiotracktype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant HlsAudioTrackType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
HlsAudioTrackType::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 HlsAudioTrackType::NewFeature
is defined.
Specifically, when hlsaudiotracktype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on HlsAudioTrackType::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. Four types of audio-only tracks are supported: Audio-Only Variant Stream The client can play back this audio-only stream instead of video in low-bandwidth scenarios. Represented as an EXT-X-STREAM-INF in the HLS manifest. Alternate Audio, Auto Select, Default Alternate rendition that the client should try to play back by default. Represented as an EXT-X-MEDIA in the HLS manifest with DEFAULT=YES, AUTOSELECT=YES Alternate Audio, Auto Select, Not Default Alternate rendition that the client may try to play back by default. Represented as an EXT-X-MEDIA in the HLS manifest with DEFAULT=NO, AUTOSELECT=YES Alternate Audio, not Auto Select Alternate rendition that the client will not try to play back by default. Represented as an EXT-X-MEDIA in the HLS manifest with DEFAULT=NO, AUTOSELECT=NO
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
AlternateAudioAutoSelect
AlternateAudioAutoSelectDefault
AlternateAudioNotAutoSelect
AudioOnlyVariantStream
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 HlsAudioTrackType
impl HlsAudioTrackType
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 HlsAudioTrackType
impl AsRef<str> for HlsAudioTrackType
source§impl Clone for HlsAudioTrackType
impl Clone for HlsAudioTrackType
source§fn clone(&self) -> HlsAudioTrackType
fn clone(&self) -> HlsAudioTrackType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for HlsAudioTrackType
impl Debug for HlsAudioTrackType
source§impl Display for HlsAudioTrackType
impl Display for HlsAudioTrackType
source§impl From<&str> for HlsAudioTrackType
impl From<&str> for HlsAudioTrackType
source§impl FromStr for HlsAudioTrackType
impl FromStr for HlsAudioTrackType
source§impl Hash for HlsAudioTrackType
impl Hash for HlsAudioTrackType
source§impl Ord for HlsAudioTrackType
impl Ord for HlsAudioTrackType
source§fn cmp(&self, other: &HlsAudioTrackType) -> Ordering
fn cmp(&self, other: &HlsAudioTrackType) -> 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 HlsAudioTrackType
impl PartialEq for HlsAudioTrackType
source§fn eq(&self, other: &HlsAudioTrackType) -> bool
fn eq(&self, other: &HlsAudioTrackType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for HlsAudioTrackType
impl PartialOrd for HlsAudioTrackType
source§fn partial_cmp(&self, other: &HlsAudioTrackType) -> Option<Ordering>
fn partial_cmp(&self, other: &HlsAudioTrackType) -> 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 HlsAudioTrackType
impl StructuralPartialEq for HlsAudioTrackType
Auto Trait Implementations§
impl Freeze for HlsAudioTrackType
impl RefUnwindSafe for HlsAudioTrackType
impl Send for HlsAudioTrackType
impl Sync for HlsAudioTrackType
impl Unpin for HlsAudioTrackType
impl UnwindSafe for HlsAudioTrackType
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