Trait devices::virtio::video::ffmpeg::TryAsAvFrameExt

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pub trait TryAsAvFrameExt {
    type BufferSource;
    type Error: Error;

    // Required method
    fn try_as_av_frame<T: AvBufferSource + 'static>(
        &self,
        wrapper: impl FnOnce(Self::BufferSource) -> T,
    ) -> Result<AvFrame, Self::Error>;
}

Required Associated Types§

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Required Methods§

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fn try_as_av_frame<T: AvBufferSource + 'static>( &self, wrapper: impl FnOnce(Self::BufferSource) -> T, ) -> Result<AvFrame, Self::Error>

Try to create an AvFrame from self.

wrapper is a constructor for T that wraps Self::BufferSource and implement the AvBufferSource functionality. This can be used to provide a custom destructor implementation: for example, sending a virtio message signaling the buffer source is no longer used and it can be recycled by the guest.

Note that Self::BufferSource might not always implement AvBufferSource. For instance, it’s not guaranteed that a MemoryMappingArena created from GuestResource will be always immutable, and the backend need to explicit acknowledge the potential unsoundness by wrapping it in MemoryMappingAvBufferSource.