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/* hacktv - Analogue video transmitter for the HackRF */
/*=======================================================================*/
/* Copyright 2018 Philip Heron <phil@sanslogic.co.uk> */
/* */
/* This program is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#include "common.h"
int gcd(int a, int b)
{
int c;
while((c = a % b))
{
a = b;
b = c;
}
return(b);
}
cint16_t *sin_cint16(unsigned int length, unsigned int cycles, double level)
{
cint16_t *lut;
unsigned int i;
double d;
lut = malloc(length * sizeof(cint16_t));
if(!lut)
{
return(NULL);
}
d = 2.0 * M_PI / length * cycles;
for(i = 0; i < length; i++)
{
lut[i].i = round(cos(d * i) * level * INT16_MAX);
lut[i].q = round(sin(d * i) * level * INT16_MAX);
}
return(lut);
}
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