/**

 * Returns the ITU EOTF corresponding to a given TRC. This converts from the

 * signal level [0,1] to the raw output display luminance in nits (cd/m^2).                         

* This is done per channel in RGB space, except for AVCOL_TRC_SMPTE428, which                      

* assumes CIE XYZ in- and output.

 *                                                                                                  * @return A pointer to the function implementing the given TRC, or NULL if no                      

*         such function is defined.

 *

 * @note In general, the resulting function is defined (wherever possible) for

 *       out-of-range values, even though these values do not have a physical

 *       meaning on the given display. Users should clamp inputs (or outputs)

 *       if this behavior is not desired.

 *

 *       This is also the case for functions like PQ, which are defined over an

 *       absolute signal range independent of the target display capabilities.

 */                                                                                                av_csp_eotf_function av_csp_itu_eotf(enum AVColorTransferCharacteristic trc);

I guess this can be used for potential HDR waveform scope  display?