[Cin] libavutil/csp.h reading

[Andrew Randrianasulu]

===
/**
 * 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?
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