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514555
2008 Mar 07
1
Bug in reference idct.
Hi
The Theora specification states, in section 7.9.3 ("The 1D Inverse 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: