pub enum Stream_Request {
    GetProperties {
        responder: Stream_GetPropertiesResponder,
    },
    GetProperties2 {
        responder: Stream_GetProperties2Responder,
    },
    SetCropRegion {
        region: Option<Box<RectF>>,
        control_handle: Stream_ControlHandle,
    },
    WatchCropRegion {
        responder: Stream_WatchCropRegionResponder,
    },
    SetResolution {
        coded_size: Size,
        control_handle: Stream_ControlHandle,
    },
    WatchResolution {
        responder: Stream_WatchResolutionResponder,
    },
    SetBufferCollection {
        token: Option<ClientEnd<BufferCollectionTokenMarker>>,
        control_handle: Stream_ControlHandle,
    },
    WatchBufferCollection {
        responder: Stream_WatchBufferCollectionResponder,
    },
    WatchOrientation {
        responder: Stream_WatchOrientationResponder,
    },
    GetNextFrame {
        responder: Stream_GetNextFrameResponder,
    },
    GetNextFrame2 {
        responder: Stream_GetNextFrame2Responder,
    },
    Rebind {
        request: ServerEnd<Stream_Marker>,
        control_handle: Stream_ControlHandle,
    },
}
Expand description

A Stream represents timing, sequencing, and other camera-specific properties applied to a buffer collection.

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GetProperties

Gets the properties associated with this stream. The value returned is identical to the one corresponding to this stream as returned by |Device.GetConfigurations|.

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GetProperties2

Gets the properties associated with this stream. The value returned is identical to the one corresponding to this stream as returned by |Device.GetConfigurations|.

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SetCropRegion

Fields

§region: Option<Box<RectF>>
§control_handle: Stream_ControlHandle

Sets the Stream’s crop region to the provided region, with the top-left of the image represented by (0,0) and the bottom-right of the image represented by (1,1). The resulting content is subsequently scaled to fill the output buffer. If the implementation does not precisely support the provided value, it will be expanded to the minimum region that covers the provided region. If region is set to null, the crop region is unset, which is equivalent to specifying a region covering the entire image. Upon initial connection, the region is unset. If the stream does not support crop region, the connection is closed with the ZX_ERR_NOT_SUPPORTED epitaph.

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WatchCropRegion

Returns the crop region if it has changed from a previously returned value, or is called by a client for the first time. Frame callbacks received after receiving this callback reflect the use of the new region. See SetCropRegion for a description of the region parameter.

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SetResolution

Fields

§coded_size: Size
§control_handle: Stream_ControlHandle

Sets the resolution of the stream to the provided value. If the implementation does not precisely support the provided value, it will be expanded to the minimum resolution that exceeds the provided resolution.

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WatchResolution

Returns the resolution if it has changed from a previously returned value, or is called by a client for the first time. Frame callbacks received after receiving this callback reflect the new resolution.

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SetBufferCollection

Fields

§token: Option<ClientEnd<BufferCollectionTokenMarker>>
§control_handle: Stream_ControlHandle

If non-null, requests renegotiation of the buffer collection backing this stream, and identifies this client as a participant in buffer negotiation. If null, identifies this client as a non-participant in buffer negotiation. Upon initial connection, the client is a non-participant. After registering as a participant, clients must always have an outstanding call to WatchBufferCollection to receive tokens from the server so that they are able to respond to current and future renegotiation requests.

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WatchBufferCollection

Returns when the server or any buffer negotiation participant (including the current client) requires buffer renegotiation, and the current client is registered as a participant. Frame callbacks received after receiving this callback apply to the newly negotiated collection.

Because the camera can output directly to these collections, each client should support reading from a |fuchsia.sysmem.CoherencyDomain| of RAM, and set |ram_domain_supported| in their |fuchsia.sysmem.BufferMemoryConstraints|.

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WatchOrientation

Returns the orientation if it has changed from a previously returned value, or is called by a client for the first time. Frame callbacks received after receiving this callback reflect the new orientation.

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GetNextFrame

See GetNextFrame2.

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GetNextFrame2

Request the next available frame for this stream that has not yet been acquired by the current client. Multiple participating clients may concurrently hold the same frame. Returns when the stream has completed populating the buffer and may be read by the client, provided the number of unreleased buffers is less than the count provided via the most recently negotiated buffer collection token. If a buffer renegotiation is in progress, this call will return only after the negotiation is complete and a new collection is available.

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Rebind

Fields

§request: ServerEnd<Stream_Marker>
§control_handle: Stream_ControlHandle

Request another connection to this Stream. This allows a client to delegate different operations to different coordinated clients, or have multiple clients concurrently observe frames produced by the stream.

Implementations§

Trait Implementations§

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impl Debug for Stream_Request

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

Formats the value using the given formatter. Read more

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unsafe fn encode( self, _encoder: &mut Encoder<'_>, _offset: usize, _depth: Depth ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more
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impl<T> Encode<Ambiguous2> for T

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unsafe fn encode( self, _encoder: &mut Encoder<'_>, _offset: usize, _depth: Depth ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more
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