ffmpeg_dev::sys

Function avpriv_get_gamma_from_trc

Source 
pub unsafe extern "C" fn avpriv_get_gamma_from_trc(
    trc: AVColorTransferCharacteristic,
) -> f64
Expand description

Determine a suitable ‘gamma’ value to match the supplied AVColorTransferCharacteristic.

See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html)

@return Will return an approximation to the simple gamma function matching the supplied Transfer Characteristic, Will return 0.0 for any we cannot reasonably match against.