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/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2006,2007,2008,2009 Josh Coalson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <math.h>
#include "FLAC/assert.h"
#include "FLAC/format.h"
#include "private/window.h"
#ifndef FLAC__INTEGER_ONLY_LIBRARY
#ifndef M_PI
/* math.h in VC++ doesn't seem to have this (how Microsoft is that?) */
#define M_PI 3.14159265358979323846
#endif
void FLAC__window_bartlett(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
if (L & 1) {
for (n = 0; n <= N/2; n++)
window[n] = 2.0f * n / (float)N;
for (; n <= N; n++)
window[n] = 2.0f - 2.0f * n / (float)N;
}
else {
for (n = 0; n <= L/2-1; n++)
window[n] = 2.0f * n / (float)N;
for (; n <= N; n++)
window[n] = 2.0f - 2.0f * (N-n) / (float)N;
}
}
void FLAC__window_bartlett_hann(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(0.62f - 0.48f * fabs((float)n/(float)N+0.5f) + 0.38f * cos(2.0f * M_PI * ((float)n/(float)N+0.5f)));
}
void FLAC__window_blackman(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(0.42f - 0.5f * cos(2.0f * M_PI * n / N) + 0.08f * cos(4.0f * M_PI * n / N));
}
/* 4-term -92dB side-lobe */
void FLAC__window_blackman_harris_4term_92db_sidelobe(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n <= N; n++)
window[n] = (FLAC__real)(0.35875f - 0.48829f * cos(2.0f * M_PI * n / N) + 0.14128f * cos(4.0f * M_PI * n / N) - 0.01168f * cos(6.0f * M_PI * n / N));
}
void FLAC__window_connes(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
const double N2 = (double)N / 2.;
FLAC__int32 n;
for (n = 0; n <= N; n++) {
double k = ((double)n - N2) / N2;
k = 1.0f - k * k;
window[n] = (FLAC__real)(k * k);
}
}
void FLAC__window_flattop(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(1.0f - 1.93f * cos(2.0f * M_PI * n / N) + 1.29f * cos(4.0f * M_PI * n / N) - 0.388f * cos(6.0f * M_PI * n / N) + 0.0322f * cos(8.0f * M_PI * n / N));
}
void FLAC__window_gauss(FLAC__real *window, const FLAC__int32 L, const FLAC__real stddev)
{
const FLAC__int32 N = L - 1;
const double N2 = (double)N / 2.;
FLAC__int32 n;
for (n = 0; n <= N; n++) {
const double k = ((double)n - N2) / (stddev * N2);
window[n] = (FLAC__real)exp(-0.5f * k * k);
}
}
void FLAC__window_hamming(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(0.54f - 0.46f * cos(2.0f * M_PI * n / N));
}
void FLAC__window_hann(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(0.5f - 0.5f * cos(2.0f * M_PI * n / N));
}
void FLAC__window_kaiser_bessel(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(0.402f - 0.498f * cos(2.0f * M_PI * n / N) + 0.098f * cos(4.0f * M_PI * n / N) - 0.001f * cos(6.0f * M_PI * n / N));
}
void FLAC__window_nuttall(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = (FLAC__real)(0.3635819f - 0.4891775f*cos(2.0f*M_PI*n/N) + 0.1365995f*cos(4.0f*M_PI*n/N) - 0.0106411f*cos(6.0f*M_PI*n/N));
}
void FLAC__window_rectangle(FLAC__real *window, const FLAC__int32 L)
{
FLAC__int32 n;
for (n = 0; n < L; n++)
window[n] = 1.0f;
}
void FLAC__window_triangle(FLAC__real *window, const FLAC__int32 L)
{
FLAC__int32 n;
if (L & 1) {
for (n = 1; n <= L+1/2; n++)
window[n-1] = 2.0f * n / ((float)L + 1.0f);
for (; n <= L; n++)
window[n-1] = - (float)(2 * (L - n + 1)) / ((float)L + 1.0f);
}
else {
for (n = 1; n <= L/2; n++)
window[n-1] = 2.0f * n / (float)L;
for (; n <= L; n++)
window[n-1] = ((float)(2 * (L - n)) + 1.0f) / (float)L;
}
}
void FLAC__window_tukey(FLAC__real *window, const FLAC__int32 L, const FLAC__real p)
{
if (p <= 0.0)
FLAC__window_rectangle(window, L);
else if (p >= 1.0)
FLAC__window_hann(window, L);
else {
const FLAC__int32 Np = (FLAC__int32)(p / 2.0f * L) - 1;
FLAC__int32 n;
/* start with rectangle... */
FLAC__window_rectangle(window, L);
/* ...replace ends with hann */
if (Np > 0) {
for (n = 0; n <= Np; n++) {
window[n] = (FLAC__real)(0.5f - 0.5f * cos(M_PI * n / Np));
window[L-Np-1+n] = (FLAC__real)(0.5f - 0.5f * cos(M_PI * (n+Np) / Np));
}
}
}
}
void FLAC__window_welch(FLAC__real *window, const FLAC__int32 L)
{
const FLAC__int32 N = L - 1;
const double N2 = (double)N / 2.;
FLAC__int32 n;
for (n = 0; n <= N; n++) {
const double k = ((double)n - N2) / N2;
window[n] = (FLAC__real)(1.0f - k * k);
}
}
#endif /* !defined FLAC__INTEGER_ONLY_LIBRARY */
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