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Flake: slight optimisation for new window functions (partial_tukey, punchout_tukey).

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This commit is contained in:
Grigory Chudov
2014-09-15 00:48:31 -04:00
parent 4dc1169c41
commit 98189de625
7 changed files with 310 additions and 197 deletions
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31
CUETools.Codecs/LPC.cs
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@@ -131,7 +131,7 @@ namespace CUETools.Codecs
* A window function is applied before calculation.
*/
static public unsafe void
compute_autocorr(/*const*/ int* data, float* window, int len, int min, int lag, double* autoc, int prev, int next)
compute_autocorr(/*const*/ int* data, float* window, int len, int min, int lag, double* autoc)
{
#if FPAC
short* data1 = stackalloc short[len + 1];
@@ -220,22 +220,18 @@ namespace CUETools.Codecs
if (lag < min) return;
}
#endif
double* data1 = stackalloc double[lag + len + lag];
double* data1 = stackalloc double[len];
int i;
for (i = 0; i < lag; i++)
data1[i] = prev != 0 ? data[i - lag] : 0;
for (i = 0; i < len; i++)
data1[lag + i] = data[i] * window[i];
for (i = 0; i < lag; i++)
data1[lag + len + i] = next != 0 ? data[len + i] : 0;
data1[i] = data[i] * window[i];
for (i = min; i <= lag; ++i)
{
double temp = 0;
double temp2 = 0;
double* pdata = data1 + lag - i;
double* finish = data1 + lag + len - 1;
double* pdata = data1;
double* finish = data1 + len - 1 - i;
while (pdata < finish)
{
@@ -361,6 +357,23 @@ namespace CUETools.Codecs
}
}
static public unsafe void
compute_autocorr_glue(/*const*/ int* data, float* window, int offs, int sz, int min, int lag, double* autoc)
{
double* data1 = stackalloc double[lag + lag];
for (int i = -lag; i < lag; i++)
data1[i + lag] = offs + i >= 0 && offs + i < sz ? data[offs + i] * window[offs + i] : 0;
for (int i = min; i <= lag; ++i)
{
double temp = 0;
double* pdata = data1 + lag - i;
double* finish = data1 + lag;
while (pdata < finish)
temp += pdata[i] * (*pdata++);
autoc[i] += temp;
}
}
static public unsafe void
compute_autocorr_glue(/*const*/ int* data, int min, int lag, double* autoc)
{