Function ep_df

cmp_framework/common/hdr_encode.cpp:2112–2114

float    ramp[3][4][SP_ERRIDX_MAX][SP_ERRIDX_MAX][16];
#else
float ep_df(int bits, int p1) {
    return (float)expandbits_(bits + BIT_BASE, p1);
}

float rampf(int clog, int bits, int p1, int p2, int i) {
    // (clog+ LOG_CL_BASE) starts from 2 to 4