Struct cros_libva::Picture

pub struct Picture<S: PictureState, T> { /* private fields */ }

A Surface that is being rendered into.

This struct abstracts the decoding flow using vaBeginPicture, vaRenderPicture, vaEndPicture and vaSyncSurface in a type-safe way.

The surface will have valid picture data after all the stages of decoding are called.

The T generic parameter must be Borrow<Surface<_>>, i.e. it can be Surface directly or some other type that contains one.

No constraint on T is specified in this declaration because specifying it here would force us to add the generic argument of Surface to this type as well, turning it into a type with 3 generics, one of which is redundant. To avoid that we leave T unconstrained and instead constrain the methods that require to act on it as a Surface.

Implementations

impl<T> Picture<PictureNew, T>

pub fn new<D: SurfaceMemoryDescriptor>( timestamp: u64, context: Rc<Context>, surface: T ) -> Self

where T: Borrow<Surface<D>>,

Creates a new Picture with a given timestamp. surface is the underlying surface that libva will render to.

pub fn new_from_same_surface<S: PictureReclaimableSurface>( timestamp: u64, picture: &Picture<S, T> ) -> Self

Creates a new Picture with a given frame_number to identify it, reusing the Surface from picture. This is useful for interlaced decoding as one can render both fields to the same underlying surface.

pub fn add_buffer(&mut self, buffer: Buffer)

Add buffer to the picture.

pub fn begin<D: SurfaceMemoryDescriptor>( self ) -> Result<Picture<PictureBegin, T>, VaError>

where T: Borrow<Surface<D>>,

Wrapper around vaBeginPicture.

impl<T> Picture<PictureBegin, T>

pub fn render(self) -> Result<Picture<PictureRender, T>, VaError>

Wrapper around vaRenderPicture.

impl<T> Picture<PictureRender, T>

pub fn end(self) -> Result<Picture<PictureEnd, T>, VaError>

Wrapper around vaEndPicture.

impl<T> Picture<PictureEnd, T>

pub fn sync<D: SurfaceMemoryDescriptor>( self ) -> Result<Picture<PictureSync, T>, (VaError, Self)>

where T: Borrow<Surface<D>>,

Syncs the picture, ensuring that all pending operations are complete when this call returns.

impl<S: PictureState, T> Picture<S, T>

pub fn timestamp(&self) -> u64

Returns the timestamp of this picture.

pub fn surface<D: SurfaceMemoryDescriptor>(&self) -> &Surface<D>

where T: Borrow<Surface<D>>,

Returns a reference to the underlying Surface.

If you are interested in obtaining the container of the Surface, use as_ref() instead. This is a convenience method to avoid having to call borrow() every time the surface is needed.

impl<S: PictureReclaimableSurface, T> Picture<S, T>

pub fn take_surface(self) -> Result<T, Self>

Reclaim ownership of the Surface this picture has been created from, consuming the picture in the process. Useful if the Surface is part of a pool.

This will fail and return the passed object if there are more than one reference to the underlying surface.

pub fn derive_image<'a, D: SurfaceMemoryDescriptor + 'a>( &'a self, visible_rect: (u32, u32) ) -> Result<Image<'_>, VaError>

where T: Borrow<Surface<D>>,

Create a new derived image from this Picture using vaDeriveImage.

Derived images are a direct view (i.e. without any copy) on the buffer content of the Picture. On the other hand, not all Pictures can be derived.

pub fn create_image<'a, D: SurfaceMemoryDescriptor + 'a>( &'a self, format: VAImageFormat, coded_resolution: (u32, u32), visible_rect: (u32, u32) ) -> Result<Image<'_>, VaError>

where T: Borrow<Surface<D>>,

Create new image from the Picture using vaCreateImage and vaGetImage.

The image will contain a copy of the Picture in the desired format and coded_resolution.

Trait Implementations

impl<S: PictureState, T> AsRef<T> for Picture<S, T>

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.