libm.h File Reference

#include <math.h>
#include "config.h"
#include "attributes.h"
#include "intfloat.h"
#include "mathematics.h"

Go to the source code of this file.

Macros
#define	atanf(x)   ((float)atan(x))
#define	atan2f(y, x)   ((float)atan2(y, x))
#define	powf(x, y)   ((float)pow(x, y))
#define	cosf(x)   ((float)cos(x))
#define	FF_ARRAY_ELEMS(a)   (sizeof(a) / sizeof((a)[0]))
#define	expf(x)   ((float)exp(x))
#define	exp2(x)   exp((x) * M_LN2)
#define	exp2f(x)   ((float)exp2(x))
#define	isinf(x)
#define	isnan(x)
#define	isfinite(x)
#define	ldexpf(x, exp)   ((float)ldexp(x, exp))
#define	llrint(x)   ((long long)rint(x))
#define	llrintf(x)   ((long long)rint(x))
#define	log2(x)   (log(x) * 1.44269504088896340736)
#define	log2f(x)   ((float)log2(x))
#define	log10f(x)   ((float)log10(x))
#define	sinf(x)   ((float)sin(x))

Functions
static av_always_inline double	cbrt (double x)
static av_always_inline float	cbrtf (float x)
static av_always_inline double	copysign (double x, double y)
static double	ff_eval_poly (const double *coeff, int size, double x)
static double	erf (double z)
	erf function Algorithm taken from the Boost project, source: http://www.boost.org/doc/libs/1_46_1/boost/math/special_functions/erf.hpp Use, modification and distribution are subject to the Boost Software License, Version 1.0 (see notice below). More...
static av_always_inline av_const int	avpriv_isinff (float x)
static av_always_inline av_const int	avpriv_isinf (double x)
static av_always_inline av_const int	avpriv_isnanf (float x)
static av_always_inline av_const int	avpriv_isnan (double x)
static av_always_inline av_const int	avpriv_isfinitef (float x)
static av_always_inline av_const int	avpriv_isfinite (double x)
static av_const double	hypot (double x, double y)
static double	rint (double x)
static av_always_inline av_const long int	lrint (double x)
static av_always_inline av_const long int	lrintf (float x)
static av_always_inline av_const double	round (double x)
static av_always_inline av_const float	roundf (float x)
static av_always_inline av_const double	trunc (double x)
static av_always_inline av_const float	truncf (float x)

Detailed Description

Replacements for frequently missing libm functions

Definition in file libm.h.

Macro Definition Documentation

atanf

#define atanf

(

x

)

((float)atan(x))

Definition at line 42 of file libm.h.

atan2f

#define atan2f	(		y,
			x
	)		((float)atan2(y, x))

Definition at line 47 of file libm.h.

powf

#define powf	(		x,
			y
	)		((float)pow(x, y))

Definition at line 52 of file libm.h.

cosf

#define cosf

(

x

)

((float)cos(x))

Definition at line 80 of file libm.h.

FF_ARRAY_ELEMS

#define FF_ARRAY_ELEMS

(

a

)

(sizeof(a) / sizeof((a)[0]))

expf

#define expf

(

x

)

((float)exp(x))

Definition at line 285 of file libm.h.

exp2

#define exp2

(

x

)

exp((x) * M_LN2)

Definition at line 290 of file libm.h.

exp2f

#define exp2f

(

x

)

((float)exp2(x))

Definition at line 295 of file libm.h.

isinf

#define isinf

(

x

)

Value:

    (sizeof(x) == sizeof(float)   \
        ? avpriv_isinff(x)        \
        : avpriv_isinf(x))

Definition at line 319 of file libm.h.

isnan

#define isnan

(

x

)

Value:

    (sizeof(x) == sizeof(float)   \
        ? avpriv_isnanf(x)        \
        : avpriv_isnan(x))

Definition at line 342 of file libm.h.

isfinite

#define isfinite

(

x

)

Value:

    (sizeof(x) == sizeof(float)      \
        ? avpriv_isfinitef(x)        \
        : avpriv_isfinite(x))

Definition at line 361 of file libm.h.

ldexpf

#define ldexpf	(		x,
			exp
	)		((float)ldexp(x, exp))

Definition at line 391 of file libm.h.

llrint

#define llrint

(

x

)

((long long)rint(x))

Definition at line 396 of file libm.h.

llrintf

#define llrintf

(

x

)

((long long)rint(x))

Definition at line 401 of file libm.h.

log2

#define log2

(

x

)

(log(x) * 1.44269504088896340736)

Definition at line 406 of file libm.h.

log2f

#define log2f

(

x

)

((float)log2(x))

Definition at line 411 of file libm.h.

log10f

#define log10f

(

x

)

((float)log10(x))

Definition at line 416 of file libm.h.

sinf

#define sinf

(

x

)

((float)sin(x))

Definition at line 421 of file libm.h.

Function Documentation

cbrt()

static av_always_inline double cbrt ( double  x )

static

Definition at line 56 of file libm.h.

cbrtf()

static av_always_inline float cbrtf ( float  x )

static

Definition at line 63 of file libm.h.

Referenced by calculate_gamma(), config_output(), decode_spectrum_and_dequant(), draw_spatial(), filter_frame(), get_cm_factor(), get_scale(), power(), quantize_and_encode_band_cost_template(), and remap_log().

copysign()

static av_always_inline double copysign ( double  x, double  y  )

static

Definition at line 70 of file libm.h.

Referenced by copysignl(), decfloat(), hexfloat(), and perform_compression().

ff_eval_poly()

static double ff_eval_poly ( const double *  coeff, int  size, double  x  )

inlinestatic

Definition at line 84 of file libm.h.

Referenced by erf().

erf()

static double erf ( double  z )

inlinestatic

erf function Algorithm taken from the Boost project, source: http://www.boost.org/doc/libs/1_46_1/boost/math/special_functions/erf.hpp Use, modification and distribution are subject to the Boost Software License, Version 1.0 (see notice below).

Boost Software License - Version 1.0 - August 17th, 2003 Permission is hereby granted, free of charge, to any person or organization obtaining a copy of the software and accompanying documentation covered by this license (the "Software") to use, reproduce, display, distribute, execute, and transmit the Software, and to prepare derivative works of the Software, and to permit third-parties to whom the Software is furnished to do so, all subject to the following:

The copyright notices in the Software and this entire statement, including the above license grant, this restriction and the following disclaimer, must be included in all copies of the Software, in whole or in part, and all derivative works of the Software, unless such copies or derivative works are solely in the form of machine-executable object code generated by a source language processor.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Definition at line 123 of file libm.h.

Referenced by bound(), and filter_dbl().

avpriv_isinff()

static av_always_inline av_const int avpriv_isinff ( float  x )

static

Definition at line 303 of file libm.h.

avpriv_isinf()

static av_always_inline av_const int avpriv_isinf ( double  x )

static

Definition at line 311 of file libm.h.

avpriv_isnanf()

static av_always_inline av_const int avpriv_isnanf ( float  x )

static

Definition at line 326 of file libm.h.

avpriv_isnan()

static av_always_inline av_const int avpriv_isnan ( double  x )

static

Definition at line 334 of file libm.h.

avpriv_isfinitef()

static av_always_inline av_const int avpriv_isfinitef ( float  x )

static

Definition at line 349 of file libm.h.

avpriv_isfinite()

static av_always_inline av_const int avpriv_isfinite ( double  x )

static

Definition at line 355 of file libm.h.

hypot()

static av_const double hypot ( double  x, double  y  )

inlinestatic

Definition at line 368 of file libm.h.

Referenced by av_display_rotation_get(), check_stability(), config_output(), config_props(), decompose_transform(), decompose_zp2biquads(), distance(), draw_curves(), eval_expr(), freq_gain(), get_natural_factor(), get_response(), h264_metadata_handle_display_orientation(), mov_read_tkhd(), oscilloscope_config_input(), parse_points(), process_frame(), ps_tableinit(), ring2_test(), update_oscilloscope(), vectorscope16(), vectorscope8(), and video_audio_display().

rint()

static double rint ( double  x )

inlinestatic

Definition at line 425 of file libm.h.

Referenced by lrint(), and lrintf().

lrint()

static av_always_inline av_const long int lrint ( double  x )

static

Definition at line 432 of file libm.h.

lrintf()

static av_always_inline av_const long int lrintf ( float  x )

static

Definition at line 439 of file libm.h.

round()

static av_always_inline av_const double round ( double  x )

static

Definition at line 446 of file libm.h.

Referenced by aom_init(), ap_init(), apply_dependent_coupling(), apply_independent_coupling(), autocorr_calc(), combine_residual_frame(), comparef(), config_input(), dequant(), eval_expr(), ff_ffv1_encode_init(), ff_hevc_idct_32x32_lsx(), filter_frame(), frame_size(), get_rotation(), hevc_idct_32x32_msa(), hevc_idct_8x32_column_lsx(), hevc_idct_8x32_column_msa(), imdct_half_32(), imdct_half_64(), lpf(), mapres(), mediacodec_init(), merge_channel_layouts_internal(), mov_write_sidx_tags(), mv_compression(), noise_scale(), ps_tableinit(), ransac_update_num_iters(), read_global_param(), sampling_init(), sbr_hf_apply_noise(), sbr_hf_assemble(), sbr_hf_inverse_filter(), sbr_sum_square_c(), scale_coefs(), sls_flags_filename_process(), subband_scale(), tta_filter_process_c(), ttaenc_filter_process_c(), vector_fmul_window_scaled_c(), and write_time().

roundf()

static av_always_inline av_const float roundf ( float  x )

static

Definition at line 453 of file libm.h.

Referenced by bitreduction(), search_for_pns(), set_special_band_scalefactors(), and xvid_correct_framerate().

trunc()

static av_always_inline av_const double trunc ( double  x )

static

Definition at line 460 of file libm.h.

truncf()

static av_always_inline av_const float truncf ( float  x )

static

Definition at line 467 of file libm.h.