Struct gstreamer::SeekFlags

pub struct SeekFlags(_);

Flags to be used with ElementExtManual::seek() or gst_event_new_seek(). All flags can be used together.

A non flushing seek might take some time to perform as the currently playing data in the pipeline will not be cleared.

An accurate seek might be slower for formats that don’t have any indexes or timestamp markers in the stream. Specifying this flag might require a complete scan of the file in those cases.

When performing a segment seek: after the playback of the segment completes, no EOS will be emitted by the element that performed the seek, but a GST_MESSAGE_SEGMENT_DONE message will be posted on the bus by the element. When this message is posted, it is possible to send a new seek event to continue playback. With this seek method it is possible to perform seamless looping or simple linear editing.

When only changing the playback rate and not the direction, the INSTANT_RATE_CHANGE flag can be used for a non-flushing seek to signal that the rate change should be applied immediately. This requires special support in the seek handlers (e.g. demuxers) and any elements synchronizing to the clock, and in general can’t work in all cases (for example UDP streaming where the delivery rate is controlled by a remote server). The instant-rate-change mode supports changing the trickmode-related GST_SEEK_ flags, but can’t be used in conjunction with other seek flags that affect the new playback position - as the playback position will not be changing.

When doing fast forward (rate > 1.0) or fast reverse (rate < -1.0) trickmode playback, the TRICKMODE flag can be used to instruct decoders and demuxers to adjust the playback rate by skipping frames. This can improve performance and decrease CPU usage because not all frames need to be decoded.

Beyond that, the TRICKMODE_KEY_UNITS flag can be used to request that decoders skip all frames except key units, and TRICKMODE_NO_AUDIO flags can be used to request that audio decoders do no decoding at all, and simple output silence.

The SNAP_BEFORE flag can be used to snap to the previous relevant location, and the SNAP_AFTER flag can be used to select the next relevant location. If KEY_UNIT is specified, the relevant location is a keyframe. If both flags are specified, the nearest of these locations will be selected. If none are specified, the implementation is free to select whichever it wants.

The before and after here are in running time, so when playing backwards, the next location refers to the one that will played in next, and not the one that is located after in the actual source stream.

Also see part-seeking.txt in the GStreamer design documentation for more details on the meaning of these flags and the behaviour expected of elements that handle them.

Implementations

impl SeekFlags

pub const FLUSH: Self = _

flush pipeline

pub const ACCURATE: Self = _

accurate position is requested, this might be considerably slower for some formats.

pub const KEY_UNIT: Self = _

seek to the nearest keyframe. This might be faster but less accurate.

pub const SEGMENT: Self = _

perform a segment seek.

pub const TRICKMODE: Self = _

when doing fast forward or fast reverse playback, allow elements to skip frames instead of generating all frames. (Since: 1.6)

pub const SKIP: Self = _

Deprecated backward compatibility flag, replaced by TRICKMODE

pub const SNAP_BEFORE: Self = _

go to a location before the requested position, if KEY_UNIT this means the keyframe at or before the requested position the one at or before the seek target.

pub const SNAP_AFTER: Self = _

go to a location after the requested position, if KEY_UNIT this means the keyframe at of after the requested position.

pub const SNAP_NEAREST: Self = _

go to a position near the requested position, if KEY_UNIT this means the keyframe closest to the requested position, if both keyframes are at an equal distance, behaves like SNAP_BEFORE.

pub const TRICKMODE_KEY_UNITS: Self = _

when doing fast forward or fast reverse playback, request that elements only decode keyframes and skip all other content, for formats that have keyframes. (Since: 1.6)

pub const TRICKMODE_NO_AUDIO: Self = _

when doing fast forward or fast reverse playback, request that audio decoder elements skip decoding and output only gap events or silence. (Since: 1.6)

pub const TRICKMODE_FORWARD_PREDICTED: Self = _

When doing fast forward or fast reverse playback, request that elements only decode keyframes and forward predicted frames and skip all other content (for example B-Frames), for formats that have keyframes and forward predicted frames. (Since: 1.18)

pub const INSTANT_RATE_CHANGE: Self = _

Signals that a rate change should be applied immediately. Only valid if start/stop position are GST_CLOCK_TIME_NONE, the playback direction does not change and the seek is not flushing. (Since: 1.18)

impl SeekFlags

pub const fn empty() -> Self

Returns an empty set of flags.

pub const fn all() -> Self

Returns the set containing all flags.

pub const fn bits(&self) -> u32

Returns the raw value of the flags currently stored.

pub const fn from_bits(bits: u32) -> Option<Self>

Convert from underlying bit representation, unless that representation contains bits that do not correspond to a flag.

pub const fn from_bits_truncate(bits: u32) -> Self

Convert from underlying bit representation, dropping any bits that do not correspond to flags.

pub const fn from_bits_retain(bits: u32) -> Self

Convert from underlying bit representation, preserving all bits (even those not corresponding to a defined flag).

pub fn from_name(name: &str) -> Option<Self>

Get the value for a flag from its stringified name.

Names are case-sensitive, so must correspond exactly to the identifier given to the flag.

pub const fn is_empty(&self) -> bool

Returns true if no flags are currently stored.

pub const fn is_all(&self) -> bool

Returns true if all flags are currently set.

pub const fn intersects(&self, other: Self) -> bool

Returns true if there are flags common to both self and other.

pub const fn contains(&self, other: Self) -> bool

Returns true if all of the flags in other are contained within self.

pub fn insert(&mut self, other: Self)

Inserts the specified flags in-place.

This method is equivalent to union.

pub fn remove(&mut self, other: Self)

Removes the specified flags in-place.

This method is equivalent to difference.

pub fn toggle(&mut self, other: Self)

Toggles the specified flags in-place.

This method is equivalent to symmetric_difference.

pub fn set(&mut self, other: Self, value: bool)

Inserts or removes the specified flags depending on the passed value.

pub const fn intersection(self, other: Self) -> Self

Returns the intersection between the flags in self and other.

Calculating self bitwise and (&) other, including any bits that don’t correspond to a defined flag.

pub const fn union(self, other: Self) -> Self

Returns the union of between the flags in self and other.

Calculates self bitwise or (|) other, including any bits that don’t correspond to a defined flag.

pub const fn difference(self, other: Self) -> Self

Returns the difference between the flags in self and other.

Calculates self bitwise and (&!) the bitwise negation of other, including any bits that don’t correspond to a defined flag.

This method is not equivalent to a & !b when there are bits set that don’t correspond to a defined flag. The ! operator will unset any bits that don’t correspond to a flag, so they’ll always be unset by a &! b, but respected by a.difference(b).

pub const fn symmetric_difference(self, other: Self) -> Self

Returns the symmetric difference between the flags in self and other.

Calculates self bitwise exclusive or (^) other, including any bits that don’t correspond to a defined flag.

pub const fn complement(self) -> Self

Returns the complement of this set of flags.

Calculates the bitwise negation (!) of self, unsetting any bits that don’t correspond to a defined flag.

impl SeekFlags

pub const fn iter(&self) -> Iter<SeekFlags>

Iterate over enabled flag values.

pub const fn iter_names(&self) -> IterNames<SeekFlags>

Iterate over enabled flag values with their stringified names.

Trait Implementations

impl Binary for SeekFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl BitAnd<SeekFlags> for SeekFlags

fn bitand(self, other: Self) -> Self

Returns the intersection between the two sets of flags.

type Output = SeekFlags

The resulting type after applying the & operator.

impl BitAndAssign<SeekFlags> for SeekFlags

fn bitand_assign(&mut self, other: Self)

Disables all flags disabled in the set.

impl BitOr<SeekFlags> for SeekFlags

fn bitor(self, other: SeekFlags) -> Self

Returns the union of the two sets of flags.

type Output = SeekFlags

The resulting type after applying the | operator.

impl BitOrAssign<SeekFlags> for SeekFlags

fn bitor_assign(&mut self, other: Self)

Adds the set of flags.

impl BitXor<SeekFlags> for SeekFlags

fn bitxor(self, other: Self) -> Self

Returns the left flags, but with all the right flags toggled.

type Output = SeekFlags

The resulting type after applying the ^ operator.

impl BitXorAssign<SeekFlags> for SeekFlags

fn bitxor_assign(&mut self, other: Self)

Toggles the set of flags.

impl Clone for SeekFlags

fn clone(&self) -> SeekFlags

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SeekFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SeekFlags

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Extend<SeekFlags> for SeekFlags

fn extend<T: IntoIterator<Item = Self>>(&mut self, iterator: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for SeekFlags

const FLAGS: &'static [Flag<SeekFlags>] = _

The set of available flags and their names.

type Bits = u32

The underlying storage type.

fn bits(&self) -> u32

Returns the raw value of the flags currently stored.

fn from_bits_retain(bits: u32) -> SeekFlags

Convert from underlying bit representation, preserving all bits (even those not corresponding to a defined flag).

fn empty() -> Self

Returns an empty set of flags.

fn all() -> Self

Returns the set containing all flags.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from underlying bit representation, unless that representation contains bits that do not correspond to a flag.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from underlying bit representation, dropping any bits that do not correspond to flags.

fn from_name(name: &str) -> Option<Self>

Get the flag for a particular name.

fn iter(&self) -> Iter<Self>

Iterate over enabled flag values.

fn iter_names(&self) -> IterNames<Self>

Iterate over the raw names and bits for enabled flag values.

fn is_empty(&self) -> bool

Returns true if no flags are currently stored.

fn is_all(&self) -> bool

Returns true if all flags are currently set.

fn intersects(&self, other: Self) -> boolwhere Self: Sized,

Returns true if there are flags common to both self and other.

fn contains(&self, other: Self) -> boolwhere Self: Sized,

Returns true if all of the flags in other are contained within self.

fn insert(&mut self, other: Self)where Self: Sized,

Inserts the specified flags in-place.

fn remove(&mut self, other: Self)where Self: Sized,

Removes the specified flags in-place.

fn toggle(&mut self, other: Self)where Self: Sized,

Toggles the specified flags in-place.

fn set(&mut self, other: Self, value: bool)where Self: Sized,

Inserts or removes the specified flags depending on the passed value.

fn intersection(self, other: Self) -> Self

Returns the intersection between the flags in self and other.

fn union(self, other: Self) -> Self

Returns the union of between the flags in self and other.

fn difference(self, other: Self) -> Self

Returns the difference between the flags in self and other.

fn symmetric_difference(self, other: Self) -> Self

Returns the symmetric difference between the flags in self and other.

fn complement(self) -> Self

Returns the complement of this set of flags.

impl From<SeekFlags> for Value

fn from(v: SeekFlags) -> Self

Converts to this type from the input type.

impl FromIterator<SeekFlags> for SeekFlags

fn from_iter<T: IntoIterator<Item = Self>>(iterator: T) -> Self

Creates a value from an iterator.

impl<'a> FromValue<'a> for SeekFlags

type Checker = GenericValueTypeChecker<SeekFlags>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl HasParamSpec for SeekFlags

type ParamSpec = ParamSpecFlags

type SetValue = SeekFlags

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str) -> ParamSpecFlagsBuilder<'_, SeekFlags>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for SeekFlags

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoIterator for SeekFlags

type Item = SeekFlags

The type of the elements being iterated over.

type IntoIter = Iter<SeekFlags>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl LowerHex for SeekFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Not for SeekFlags

fn not(self) -> Self

Returns the complement of this set of flags.

type Output = SeekFlags

The resulting type after applying the ! operator.

impl Octal for SeekFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq<SeekFlags> for SeekFlags

fn eq(&self, other: &SeekFlags) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PublicFlags for SeekFlags

type Primitive = u32

The type of the underlying storage.

type Internal = InternalBitFlags

The type of the internal field on the generated flags type.

impl Serialize for SeekFlags

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>where S: Serializer,

Serialize this value into the given Serde serializer.

impl StaticType for SeekFlags

fn static_type() -> Type

Returns the type identifier of Self.

impl Sub<SeekFlags> for SeekFlags

fn sub(self, other: Self) -> Self

Returns the set difference of the two sets of flags.

type Output = SeekFlags

The resulting type after applying the - operator.

impl SubAssign<SeekFlags> for SeekFlags

fn sub_assign(&mut self, other: Self)

Disables all flags enabled in the set.

impl ToValue for SeekFlags

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifer of self.

impl UpperHex for SeekFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ValueType for SeekFlags

type Type = SeekFlags

Type to get the Type from.

impl Copy for SeekFlags

impl Eq for SeekFlags

impl StructuralEq for SeekFlags

impl StructuralPartialEq for SeekFlags