static StdEntropyDecoder()
{
{
int i, j;
//double val, deltaMSE;
int[] inter_sc_lut;
int ds, us, rs, ls;
int dsgn, usgn, rsgn, lsgn;
int h, v;
// Initialize the zero coding lookup tables
// LH
// - No neighbors significant
ZC_LUT_LH[0] = 2;
// - No horizontal or vertical neighbors significant
for (i = 1; i < 16; i++)
{
// Two or more diagonal coeffs significant
ZC_LUT_LH[i] = 4;
}
for (i = 0; i < 4; i++)
{
// Only one diagonal coeff significant
ZC_LUT_LH[1 << i] = 3;
}
// - No horizontal neighbors significant, diagonal irrelevant
for (i = 0; i < 16; i++)
{
// Only one vertical coeff significant
ZC_LUT_LH[STATE_V_U_R1 | i] = 5;
ZC_LUT_LH[STATE_V_D_R1 | i] = 5;
// The two vertical coeffs significant
ZC_LUT_LH[STATE_V_U_R1 | STATE_V_D_R1 | i] = 6;
}
// - One horiz. neighbor significant, diagonal/vertical non-significant
ZC_LUT_LH[STATE_H_L_R1] = 7;
ZC_LUT_LH[STATE_H_R_R1] = 7;
// - One horiz. significant, no vertical significant, one or more
// diagonal significant
for (i = 1; i < 16; i++)
{
ZC_LUT_LH[STATE_H_L_R1 | i] = 8;
ZC_LUT_LH[STATE_H_R_R1 | i] = 8;
}
// - One horiz. significant, one or more vertical significant,
// diagonal irrelevant
for (i = 1; i < 4; i++)
{
for (j = 0; j < 16; j++)
{
ZC_LUT_LH[STATE_H_L_R1 | (i << 4) | j] = 9;
ZC_LUT_LH[STATE_H_R_R1 | (i << 4) | j] = 9;
}
}
// - Two horiz. significant, others irrelevant
for (i = 0; i < 64; i++)
{
ZC_LUT_LH[STATE_H_L_R1 | STATE_H_R_R1 | i] = 10;
}
// HL
// - No neighbors significant
ZC_LUT_HL[0] = 2;
// - No horizontal or vertical neighbors significant
for (i = 1; i < 16; i++)
{
// Two or more diagonal coeffs significant
ZC_LUT_HL[i] = 4;
}
for (i = 0; i < 4; i++)
{
// Only one diagonal coeff significant
ZC_LUT_HL[1 << i] = 3;
}
// - No vertical significant, diagonal irrelevant
for (i = 0; i < 16; i++)
{
// One horiz. significant
ZC_LUT_HL[STATE_H_L_R1 | i] = 5;
ZC_LUT_HL[STATE_H_R_R1 | i] = 5;
// Two horiz. significant
ZC_LUT_HL[STATE_H_L_R1 | STATE_H_R_R1 | i] = 6;
}
// - One vert. significant, diagonal/horizontal non-significant
ZC_LUT_HL[STATE_V_U_R1] = 7;
ZC_LUT_HL[STATE_V_D_R1] = 7;
// - One vert. significant, horizontal non-significant, one or more
// diag. significant
for (i = 1; i < 16; i++)
{
ZC_LUT_HL[STATE_V_U_R1 | i] = 8;
ZC_LUT_HL[STATE_V_D_R1 | i] = 8;
}
// - One vertical significant, one or more horizontal significant,
// diagonal irrelevant
for (i = 1; i < 4; i++)
{
for (j = 0; j < 16; j++)
{
ZC_LUT_HL[(i << 6) | STATE_V_U_R1 | j] = 9;
ZC_LUT_HL[(i << 6) | STATE_V_D_R1 | j] = 9;
}
}
// - Two vertical significant, others irrelevant
for (i = 0; i < 4; i++)
{
for (j = 0; j < 16; j++)
{
ZC_LUT_HL[(i << 6) | STATE_V_U_R1 | STATE_V_D_R1 | j] = 10;
}
}
// HH
int[] twoBits = new int[]{3, 5, 6, 9, 10, 12}; // Figures (between 0 and 15)
// countaning 2 and only 2 bits on in its binary representation.
int[] oneBit = new int[]{1, 2, 4, 8}; // Figures (between 0 and 15)
// countaning 1 and only 1 bit on in its binary representation.
int[] twoLeast = new int[]{3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15}; // Figures
// (between 0 and 15) countaining, at least, 2 bits on in its
// binary representation.
int[] threeLeast = new int[]{7, 11, 13, 14, 15}; // Figures
// (between 0 and 15) countaining, at least, 3 bits on in its
// binary representation.
// - None significant
ZC_LUT_HH[0] = 2;
// - One horizontal+vertical significant, none diagonal
for (i = 0; i < oneBit.Length; i++)
ZC_LUT_HH[oneBit[i] << 4] = 3;
// - Two or more horizontal+vertical significant, diagonal non-signif
for (i = 0; i < twoLeast.Length; i++)
ZC_LUT_HH[twoLeast[i] << 4] = 4;
// - One diagonal significant, horiz./vert. non-significant
for (i = 0; i < oneBit.Length; i++)
ZC_LUT_HH[oneBit[i]] = 5;
// - One diagonal significant, one horiz.+vert. significant
for (i = 0; i < oneBit.Length; i++)
for (j = 0; j < oneBit.Length; j++)
ZC_LUT_HH[(oneBit[i] << 4) | oneBit[j]] = 6;
// - One diag signif, two or more horiz+vert signif
for (i = 0; i < twoLeast.Length; i++)
for (j = 0; j < oneBit.Length; j++)
ZC_LUT_HH[(twoLeast[i] << 4) | oneBit[j]] = 7;
// - Two diagonal significant, none horiz+vert significant
for (i = 0; i < twoBits.Length; i++)
ZC_LUT_HH[twoBits[i]] = 8;
// - Two diagonal significant, one or more horiz+vert significant
for (j = 0; j < twoBits.Length; j++)
for (i = 1; i < 16; i++)
ZC_LUT_HH[(i << 4) | twoBits[j]] = 9;
// - Three or more diagonal significant, horiz+vert irrelevant
for (i = 0; i < 16; i++)
for (j = 0; j < threeLeast.Length; j++)
ZC_LUT_HH[(i << 4) | threeLeast[j]] = 10;
// Initialize the SC lookup tables
// Use an intermediate sign code lookup table that is similar to the
// one in the VM text, in that it depends on the 'h' and 'v'
// quantities. The index into this table is a 6 bit index, the top 3
// bits are (h+1) and the low 3 bits (v+1).
inter_sc_lut = new int[36];
inter_sc_lut[(2 << 3) | 2] = 15;
inter_sc_lut[(2 << 3) | 1] = 14;
inter_sc_lut[(2 << 3) | 0] = 13;
inter_sc_lut[(1 << 3) | 2] = 12;
inter_sc_lut[(1 << 3) | 1] = 11;
inter_sc_lut[(1 << 3) | 0] = 12 | INT_SIGN_BIT;
inter_sc_lut[(0 << 3) | 2] = 13 | INT_SIGN_BIT;
inter_sc_lut[(0 << 3) | 1] = 14 | INT_SIGN_BIT;
inter_sc_lut[(0 << 3) | 0] = 15 | INT_SIGN_BIT;
// Using the intermediate sign code lookup table create the final
// one. The index into this table is a 9 bit index, the low 4 bits are
// the significance of the 4 horizontal/vertical neighbors, while the
// top 4 bits are the signs of those neighbors. The bit in the middle
// is ignored. This index arrangement matches the state bits in the
// 'state' array, thus direct addressing of the table can be done from
// the sate information.
for (i = 0; i < (1 << SC_LUT_BITS) - 1; i++)
{
ds = i & 0x01; // significance of down neighbor
us = (i >> 1) & 0x01; // significance of up neighbor
rs = (i >> 2) & 0x01; // significance of right neighbor
ls = (i >> 3) & 0x01; // significance of left neighbor
dsgn = (i >> 5) & 0x01; // sign of down neighbor
usgn = (i >> 6) & 0x01; // sign of up neighbor
rsgn = (i >> 7) & 0x01; // sign of right neighbor
lsgn = (i >> 8) & 0x01; // sign of left neighbor
// Calculate 'h' and 'v' as in VM text
h = ls * (1 - 2 * lsgn) + rs * (1 - 2 * rsgn);
h = (h >= - 1)?h:- 1;
h = (h <= 1)?h:1;
v = us * (1 - 2 * usgn) + ds * (1 - 2 * dsgn);
v = (v >= - 1)?v:- 1;
v = (v <= 1)?v:1;
// Get context and sign predictor from 'inter_sc_lut'
SC_LUT[i] = inter_sc_lut[(h + 1) << 3 | (v + 1)];
}
inter_sc_lut = null;
// Initialize the MR lookup tables
// None significant, prev MR off
MR_LUT[0] = 16;
// One or more significant, prev MR off
for (i = 1; i < (1 << (MR_LUT_BITS - 1)); i++)
{
MR_LUT[i] = 17;
}
// Previous MR on, significance irrelevant
for (; i < (1 << MR_LUT_BITS); i++)
{
MR_LUT[i] = 18;
}
}
}
