[XviD-devel] FDCT constants
lakshmikanth r
r_lakshmikanth at yahoo.com
Mon Nov 29 07:46:52 CET 2004
HI,
I am a new to the field of MPEG4 encodeing and I was
going through your xvid reference code and in specfic
DCT calculation. The following line of code is found
in dct.c
"
#define FIX_0_298631336 ((int) 2446) /*
FIX(0.298631336) */
#define FIX_0_390180644 ((int) 3196) /*
FIX(0.390180644) */
#define FIX_0_541196100 ((int) 4433) /*
FIX(0.541196100) */
#define FIX_0_765366865 ((int) 6270) /*
FIX(0.765366865) */
#define FIX_0_899976223 ((int) 7373) /*
FIX(0.899976223) */
#define FIX_1_175875602 ((int) 9633) /*
FIX(1.175875602) */
#define FIX_1_501321110 ((int) 12299) /*
FIX(1.501321110) */
#define FIX_1_847759065 ((int) 15137) /*
FIX(1.847759065) */
#define FIX_1_961570560 ((int) 16069) /*
FIX(1.961570560) */
#define FIX_2_053119869 ((int) 16819) /*
FIX(2.053119869) */
#define FIX_2_562915447 ((int) 20995) /*
FIX(2.562915447) */
#define FIX_3_072711026 ((int) 25172) /*
FIX(3.072711026) */
"
Can any one of explain what is calculation to arrive
at the following constants,
(0.298631336),
(0.390180644),
(0.541196100),
(0.765366865),
(0.899976223),
(1.175875602),
(1.501321110),
(1.847759065),
(1.961570560),
(2.053119869),
(2.562915447),
(3.072711026),
"
Awaiting your response,
With regards,
R.Lakshmikanth
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