search for: oc_c4s4

...erse DCT") steps 14-16: 14. Assign T[5] the value T[4] - T[5]. 15. Truncate T[5] to a 16-bit representation by dropping any higher-order bits. 16. Assign T[5] the value C4 * (-T[5]) >> 16. However, the relevant section of code in the reference decoder (lib/dec/idct.c line 50) is: t[5]=OC_C4S4*(ogg_int16_t)(t[4]-t[5])>>16; i.e. T[5] (the result of T[4]-T[5]) is not inverted before being multiplied by C4. Lines 106, 150 and 190 in idct.c do the same thing - the spec says the result of (T[4] - T[5]) should be negated before being multiplied. I believe this is a bug in the reference...