math.h File Reference

Math utils. More...

#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include "utils/types.h"
#include <float.h>

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Macros
#define	MATH_RMS_FRAMES   1
	Frames to skip when calculating the RMS.
#define	MATH_TINY_NUMBER   (0.0000001)
	Tiny number to be used for denormaml prevention (-140dB).
#define	MATH_MINUS_INFINITY   (-HUGE_VAL)
#define	math_floats_equal_epsilon(a, b, e)    ((a) > (b) ? (a) - (b) < e : (b) - (a) < e)
	Checks if 2 doubles are equal.
#define	math_doubles_equal_epsilon   math_floats_equal_epsilon
#define	math_floats_equal(a, b)    ((a) > (b) ? (a) - (b) < FLT_EPSILON : (b) - (a) < FLT_EPSILON)
	Checks if 2 doubles are equal.
#define	math_doubles_equal(a, b)    ((a) > (b) ? (a) - (b) < DBL_EPSILON : (b) - (a) < DBL_EPSILON)
#define	math_round_double_to_signed_32(x)   (lround (x))
	Rounds a double to a (minimum) signed 32-bit integer.
#define	math_round_double_to_signed_64(x)   (llround (x))
	Rounds a double to a (minimum) signed 64-bit integer.
#define	math_round_double_to_signed_frame_t(x)    math_round_double_to_signed_64 (x)
#define	math_round_float_to_signed_32(x)   (lroundf (x))
	Rounds a float to a (minimum) signed 32-bit integer.
#define	math_round_float_to_signed_64(x)   (llroundf (x))
	Rounds a float to a (minimum) signed 64-bit integer.
#define	math_round_float_to_signed_frame_t(x)   math_round_float_to_signed_64 (x)

Functions
sample_t	math_calculate_rms_amp (sample_t *buf, const nframes_t nframes)
sample_t	math_calculate_rms_db (sample_t *buf, const nframes_t nframes)
	Calculate db using RMS method.
bool	math_assert_nonnann (float x)
	Asserts that the value is non-nan.
bool	math_is_string_valid_float (const char *str, float *ret)
	Returns whether the given string is a valid float.

Detailed Description

Math utils.

For more, look at libs/pbd/pbd/control_math.h in ardour.

Definition in file math.h.