Enum Seek 

pub enum Seek {
    Exact(VideoFrame),
    Preview {
        picture: VideoFrame,
        frame: FrameIndex,
    },
    Pending,
}

What a constant-time ExactFrameReader::seek could answer with.

A seek is a question about a position on the timeline, and it has to be answered now: the exact frame at an arbitrary point of a long group of pictures is a decode of every frame before it, which on a 1080p track is seconds rather than the SEEK_LATENCY_BUDGET ARCHITECTURE.md section 3.2 allows. So a seek returns the best picture already decoded and the caller walks to the exact one behind it with ExactFrameReader::get if it still wants it.

Variants

Exact(VideoFrame)

The frame asked for, already decoded and cached. Nothing further is needed.

Preview

A picture of a different frame, the closest one the seek preview index holds.

Fields

picture: VideoFrame

frame: FrameIndex

The frame picture is actually of, which is within one preview stride of the frame asked for once the pass has covered that part of the track.

Pending

Nothing is decoded yet for anywhere near this position: no cached frame, and either no preview index attached or an index whose pass has not produced a picture.

Trait Implementations

impl Clone for Seek

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Seek

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

Formats the value using the given formatter.

impl Eq for Seek

impl PartialEq for Seek

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Seek