File: tools.c

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/*
 * tools.c
 *
 *  Created on: 13.01.2017
 *      Author: hoene
 */
#define _USE_MATH_DEFINES
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "tools.h"
#include "mysofa_export.h"
#include "mysofa.h"

char *mysofa_strdup(const char *str)
{
	size_t size = strlen(str) + 1;
	char *copy = malloc(size);
	if(copy)
		memcpy(copy, str, size);
	return copy;
}

int verifyAttribute(struct MYSOFA_ATTRIBUTE *attr, char *name, char *value) {
	while (attr) {
		if (!strcmp(name, attr->name) && !strcmp(value, attr->value))
			return 1;
		attr = attr->next;
	}
	return 0;
}

int changeAttribute(struct MYSOFA_ATTRIBUTE *attr, char *name, char *value,
		    char *newvalue) {
	while (attr) {
		if (!strcmp(name, attr->name)
		    && (value == NULL || !strcmp(value, attr->value))) {
			free(attr->value);
			attr->value = mysofa_strdup(newvalue);
			return 1;
		}
		attr = attr->next;
	}
	return 0;
}

MYSOFA_EXPORT
char* mysofa_getAttribute(struct MYSOFA_ATTRIBUTE *attr, char *name) {
	while (attr) {
		if (!strcmp(name, attr->name)) {
			return attr->value;
		}
		attr = attr->next;
	}
	return NULL;
}

MYSOFA_EXPORT void mysofa_c2s(float values[3])
{
	float x,y,z,r,theta,phi;
	x = values[0];
	y = values[1];
	z = values[2];
	r = radius(values);

	theta = atan2f(z, sqrtf(x * x + y * y));
	phi = atan2f(y, x);

	values[0] = fmodf(phi * (180 / M_PI) + 360, 360);
	values[1] = theta * (180 / M_PI);
	values[2] = r;
}

MYSOFA_EXPORT void mysofa_s2c(float values[3])
{
	float x, r, theta, phi;
	phi = values[0] * (M_PI / 180);
	theta = values[1] * (M_PI / 180);
	r = values[2];
	x = cosf(theta) * r;
	values[2] = sinf(theta) * r;
	values[0] = cosf(phi) * x;
	values[1] = sinf(phi) * x;
}

void convertCartesianToSpherical(float *values, int elements) {
	int i;

	for (i = 0; i < elements - 2; i += 3) {
		mysofa_c2s(values+i);
	}
}

void convertSphericalToCartesian(float *values, int elements) {

	int i;

	for (i = 0; i < elements - 2; i += 3) {
		mysofa_s2c(values+i);
	}
}

float radius(float *cartesian) {
	return sqrtf(
		powf(cartesian[0], 2.f) + powf(cartesian[1], 2.f)
		+ powf(cartesian[2], 2.f));
}

/*
 * search of the nearest
 */

void nsearch(const void *key, const char *base, size_t num, size_t size,
	     int (*cmp)(const void *key, const void *elt), int *lower, int *higher) {
	size_t start = 0, end = num;
	int result;

	while (start < end) {
		size_t mid = start + (end - start) / 2;

		result = cmp(key, base + mid * size);
		if (result < 0)
			end = mid;
		else if (result > 0)
			start = mid + 1;
		else {
			*lower = mid;
			*higher = mid;
			return;
		}
	}

	if (start == num) {
		*lower = start - 1;
		*higher = -1;
	} else if (start == 0) {
		*lower = -1;
		*higher = 0;
	} else {
		*lower = start - 1;
		*higher = start;
	}
}

void copyToFloat(float *out, float *in, int size) {
	while (size > 0) {
		*out++ = *in++;
		size--;
	}
}

void copyFromFloat(float *out, float *in, int size) {
	while (size > 0) {
		*out++ = *in++;
		size--;
	}
}

void copyArrayWeighted(float *dst, float *src, int size, float w) {
	while (size > 0) {
		*dst++ = *src++ * w;
		size--;
	}
}

void addArrayWeighted(float *dst, float *src, int size, float w) {
	while (size > 0) {
		*dst++ += *src++ * w;
		size--;
	}
}

void scaleArray(float *dst, int size, float w) {
	while (size > 0) {
		*dst++ *= w;
		size--;
	}
}
float loudness(float *in, int size) {
	float res = 0;
	while (size > 0) {
		res += *in * *in;
		in++;
		size--;
	}
	return res;
}