Trait v4l::video::traits::Capture

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pub trait Capture {
    // Required methods
    fn enum_frameintervals(
        &self,
        fourcc: FourCC,
        width: u32,
        height: u32,
    ) -> Result<Vec<FrameInterval>>;
    fn enum_framesizes(&self, fourcc: FourCC) -> Result<Vec<FrameSize>>;
    fn enum_formats(&self) -> Result<Vec<FormatDescription>>;
    fn format(&self) -> Result<Format>;
    fn set_format(&self, fmt: &Format) -> Result<Format>;
    fn params(&self) -> Result<CaptureParameters>;
    fn set_params(
        &self,
        params: &CaptureParameters,
    ) -> Result<CaptureParameters>;
}

Expand description

Capture device protocol

Required Methods§

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fn enum_frameintervals( &self, fourcc: FourCC, width: u32, height: u32, ) -> Result<Vec<FrameInterval>>

Returns a vector of all frame intervals that the device supports for the given pixel format and frame size

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fn enum_framesizes(&self, fourcc: FourCC) -> Result<Vec<FrameSize>>

Returns a vector of valid framesizes that the device supports for the given pixel format

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fn enum_formats(&self) -> Result<Vec<FormatDescription>>

Returns a vector of valid formats for this device

The “emulated” field describes formats filled in by libv4lconvert. There may be a conversion related performance penalty when using them.

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fn format(&self) -> Result<Format>

Returns the format currently in use

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fn set_format(&self, fmt: &Format) -> Result<Format>

Modifies the capture format and returns the actual format

The driver tries to match the format parameters on a best effort basis. Thus, if the combination of format properties cannot be achieved, the closest possible settings are used and reported back.