internal static void renormalise_vector(int[] X, int X_ptr, int N, int gain)
{
int i;
int k;
int E;
int g;
int t;
int xptr;
#if UNSAFE
unsafe
{
fixed(int *px_base = X)
{
int *px = px_base + X_ptr;
E = CeltConstants.EPSILON + Kernels.celt_inner_prod(px, px, N);
}
}
#else
E = CeltConstants.EPSILON + Kernels.celt_inner_prod(X, X_ptr, X, X_ptr, N);
#endif
k = Inlines.celt_ilog2(E) >> 1;
t = Inlines.VSHR32(E, 2 * (k - 7));
g = Inlines.MULT16_16_P15(Inlines.celt_rsqrt_norm(t), gain);
xptr = X_ptr;
for (i = 0; i < N; i++)
{
X[xptr] = Inlines.EXTRACT16(Inlines.PSHR32(Inlines.MULT16_16(g, X[xptr]), k + 1));
xptr++;
}
/*return celt_sqrt(E);*/
}
internal static int pitch_xcorr(
int[] _x,
int[] _y,
int[] xcorr,
int len,
int max_pitch)
{
int i;
int maxcorr = 1;
Inlines.OpusAssert(max_pitch > 0);
for (i = 0; i < max_pitch - 3; i += 4)
{
int sum0 = 0, sum1 = 0, sum2 = 0, sum3 = 0;
Kernels.xcorr_kernel(_x, _y, i, ref sum0, ref sum1, ref sum2, ref sum3, len);
xcorr[i] = sum0;
xcorr[i + 1] = sum1;
xcorr[i + 2] = sum2;
xcorr[i + 3] = sum3;
sum0 = Inlines.MAX32(sum0, sum1);
sum2 = Inlines.MAX32(sum2, sum3);
sum0 = Inlines.MAX32(sum0, sum2);
maxcorr = Inlines.MAX32(maxcorr, sum0);
}
/* In case max_pitch isn't a multiple of 4, do non-unrolled version. */
for (; i < max_pitch; i++)
{
int inner_sum = Kernels.celt_inner_prod(_x, 0, _y, i, len);
xcorr[i] = inner_sum;
maxcorr = Inlines.MAX32(maxcorr, inner_sum);
}
return(maxcorr);
}
internal static int stereo_itheta(int[] X, int X_ptr, int[] Y, int Y_ptr, int stereo, int N)
{
int i;
int itheta;
int mid, side;
int Emid, Eside;
Emid = Eside = CeltConstants.EPSILON;
if (stereo != 0)
{
for (i = 0; i < N; i++)
{
int m, s;
m = Inlines.ADD16(Inlines.SHR16(X[X_ptr + i], 1), Inlines.SHR16(Y[Y_ptr + i], 1));
s = Inlines.SUB16(Inlines.SHR16(X[X_ptr + i], 1), Inlines.SHR16(Y[Y_ptr + i], 1));
Emid = Inlines.MAC16_16(Emid, m, m);
Eside = Inlines.MAC16_16(Eside, s, s);
}
}
else
{
Emid += Kernels.celt_inner_prod(X, X_ptr, X, X_ptr, N);
Eside += Kernels.celt_inner_prod(Y, Y_ptr, Y, Y_ptr, N);
}
mid = (Inlines.celt_sqrt(Emid));
side = (Inlines.celt_sqrt(Eside));
/* 0.63662 = 2/pi */
itheta = Inlines.MULT16_16_Q15(((short)(0.5 + (0.63662f) * (((int)1) << (15)))) /*Inlines.QCONST16(0.63662f, 15)*/, Inlines.celt_atan2p(side, mid));
return(itheta);
}
internal static unsafe int pitch_xcorr(
short[] _x,
int _x_ptr,
short[] _y,
int _y_ptr,
int[] xcorr,
int len,
int max_pitch)
{
int i;
int maxcorr = 1;
Inlines.OpusAssert(max_pitch > 0);
fixed(int *pxcorr = xcorr)
{
fixed(short *px_base = _x, py_base = _y)
{
short *px = px_base + _x_ptr;
for (i = 0; i < max_pitch - 3; i += 4)
{
int sum0 = 0, sum1 = 0, sum2 = 0, sum3 = 0;
short *py = py_base + _y_ptr + i;
Kernels.xcorr_kernel(px, py, ref sum0, ref sum1, ref sum2, ref sum3, len);
int *pxcorr2 = pxcorr + i;
pxcorr2[0] = sum0;
pxcorr2[1] = sum1;
pxcorr2[2] = sum2;
pxcorr2[3] = sum3;
sum0 = Inlines.MAX32(sum0, sum1);
sum2 = Inlines.MAX32(sum2, sum3);
sum0 = Inlines.MAX32(sum0, sum2);
maxcorr = Inlines.MAX32(maxcorr, sum0);
}
/* In case max_pitch isn't a multiple of 4, do non-unrolled version. */
for (; i < max_pitch; i++)
{
short *py = py_base + _y_ptr + i;
int inner_sum = Kernels.celt_inner_prod(px, py, len);
xcorr[i] = inner_sum;
maxcorr = Inlines.MAX32(maxcorr, inner_sum);
}
}
}
return(maxcorr);
}
internal static int remove_doubling(int[] x, int maxperiod, int minperiod,
int N, ref int T0_, int prev_period, int prev_gain)
{
int k, i, T, T0;
int g, g0;
int pg;
int yy, xx, xy, xy2;
int[] xcorr = new int[3];
int best_xy, best_yy;
int offset;
int minperiod0 = minperiod;
maxperiod /= 2;
minperiod /= 2;
T0_ /= 2;
prev_period /= 2;
N /= 2;
int x_ptr = maxperiod;
if (T0_ >= maxperiod)
{
T0_ = maxperiod - 1;
}
T = T0 = T0_;
int[] yy_lookup = new int[maxperiod + 1];
Kernels.dual_inner_prod(x, x_ptr, x, x_ptr, x, x_ptr - T0, N, out xx, out xy);
yy_lookup[0] = xx;
yy = xx;
for (i = 1; i <= maxperiod; i++)
{
int xi = x_ptr - i;
yy = yy + Inlines.MULT16_16(x[xi], x[xi]) - Inlines.MULT16_16(x[xi + N], x[xi + N]);
yy_lookup[i] = Inlines.MAX32(0, yy);
}
yy = yy_lookup[T0];
best_xy = xy;
best_yy = yy;
{
int x2y2;
int sh, t;
x2y2 = 1 + Inlines.HALF32(Inlines.MULT32_32_Q31(xx, yy));
sh = Inlines.celt_ilog2(x2y2) >> 1;
t = Inlines.VSHR32(x2y2, 2 * (sh - 7));
g = (Inlines.VSHR32(Inlines.MULT16_32_Q15(Inlines.celt_rsqrt_norm(t), xy), sh + 1));
g0 = g;
}
/* Look for any pitch at T/k */
for (k = 2; k <= 15; k++)
{
int T1, T1b;
int g1;
int cont = 0;
int thresh;
T1 = Inlines.celt_udiv(2 * T0 + k, 2 * k);
if (T1 < minperiod)
{
break;
}
/* Look for another strong correlation at T1b */
if (k == 2)
{
if (T1 + T0 > maxperiod)
{
T1b = T0;
}
else
{
T1b = T0 + T1;
}
}
else
{
T1b = Inlines.celt_udiv(2 * second_check[k] * T0 + k, 2 * k);
}
Kernels.dual_inner_prod(x, x_ptr, x, x_ptr - T1, x, x_ptr - T1b, N, out xy, out xy2);
xy += xy2;
yy = yy_lookup[T1] + yy_lookup[T1b];
{
int x2y2;
int sh, t;
x2y2 = 1 + Inlines.MULT32_32_Q31(xx, yy);
sh = Inlines.celt_ilog2(x2y2) >> 1;
t = Inlines.VSHR32(x2y2, 2 * (sh - 7));
g1 = (Inlines.VSHR32(Inlines.MULT16_32_Q15(Inlines.celt_rsqrt_norm(t), xy), sh + 1));
}
if (Inlines.abs(T1 - prev_period) <= 1)
{
cont = prev_gain;
}
else if (Inlines.abs(T1 - prev_period) <= 2 && 5 * k * k < T0)
{
cont = Inlines.HALF16(prev_gain);
}
else
{
cont = 0;
}
thresh = Inlines.MAX16(((short)(0.5 + (.3f) * (((int)1) << (15)))) /*Inlines.QCONST16(.3f, 15)*/, (Inlines.MULT16_16_Q15(((short)(0.5 + (.7f) * (((int)1) << (15)))) /*Inlines.QCONST16(.7f, 15)*/, g0) - cont));
/* Bias against very high pitch (very short period) to avoid false-positives
* due to short-term correlation */
if (T1 < 3 * minperiod)
{
thresh = Inlines.MAX16(((short)(0.5 + (.4f) * (((int)1) << (15)))) /*Inlines.QCONST16(.4f, 15)*/, (Inlines.MULT16_16_Q15(((short)(0.5 + (.85f) * (((int)1) << (15)))) /*Inlines.QCONST16(.85f, 15)*/, g0) - cont));
}
else if (T1 < 2 * minperiod)
{
thresh = Inlines.MAX16(((short)(0.5 + (.5f) * (((int)1) << (15)))) /*Inlines.QCONST16(.5f, 15)*/, (Inlines.MULT16_16_Q15(((short)(0.5 + (.9f) * (((int)1) << (15)))) /*Inlines.QCONST16(.9f, 15)*/, g0) - cont));
}
if (g1 > thresh)
{
best_xy = xy;
best_yy = yy;
T = T1;
g = g1;
}
}
best_xy = Inlines.MAX32(0, best_xy);
if (best_yy <= best_xy)
{
pg = CeltConstants.Q15ONE;
}
else
{
pg = (Inlines.SHR32(Inlines.frac_div32(best_xy, best_yy + 1), 16));
}
for (k = 0; k < 3; k++)
{
xcorr[k] = Kernels.celt_inner_prod(x, x_ptr, x, x_ptr - (T + k - 1), N);
}
if ((xcorr[2] - xcorr[0]) > Inlines.MULT16_32_Q15(((short)(0.5 + (.7f) * (((int)1) << (15)))) /*Inlines.QCONST16(.7f, 15)*/, xcorr[1] - xcorr[0]))
{
offset = 1;
}
else if ((xcorr[0] - xcorr[2]) > Inlines.MULT16_32_Q15(((short)(0.5 + (.7f) * (((int)1) << (15)))) /*Inlines.QCONST16(.7f, 15)*/, xcorr[1] - xcorr[2]))
{
offset = -1;
}
else
{
offset = 0;
}
if (pg > g)
{
pg = g;
}
T0_ = 2 * T + offset;
if (T0_ < minperiod0)
{
T0_ = minperiod0;
}
return(pg);
}