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mathematics.h File Reference
#include <stdint.h>
#include <math.h>
#include "attributes.h"
#include "rational.h"
#include "intfloat.h"

Go to the source code of this file.

Macros

#define M_E   2.7182818284590452354 /* e */
 
#define M_LN2   0.69314718055994530942 /* log_e 2 */
 
#define M_LN10   2.30258509299404568402 /* log_e 10 */
 
#define M_LOG2_10   3.32192809488736234787 /* log_2 10 */
 
#define M_PHI   1.61803398874989484820 /* phi / golden ratio */
 
#define M_PI   3.14159265358979323846 /* pi */
 
#define M_PI_2   1.57079632679489661923 /* pi/2 */
 
#define M_SQRT1_2   0.70710678118654752440 /* 1/sqrt(2) */
 
#define M_SQRT2   1.41421356237309504880 /* sqrt(2) */
 
#define NAN   av_int2float(0x7fc00000)
 
#define INFINITY   av_int2float(0x7f800000)
 

Enumerations

enum  AVRounding {
  AV_ROUND_ZERO = 0, AV_ROUND_INF = 1, AV_ROUND_DOWN = 2, AV_ROUND_UP = 3,
  AV_ROUND_NEAR_INF = 5, AV_ROUND_PASS_MINMAX = 8192
}
 Rounding methods. More...
 

Functions

int64_t av_const av_gcd (int64_t a, int64_t b)
 Compute the greatest common divisor of two integer operands. More...
 
int64_t av_rescale (int64_t a, int64_t b, int64_t c) av_const
 Rescale a 64-bit integer with rounding to nearest. More...
 
int64_t av_rescale_rnd (int64_t a, int64_t b, int64_t c, enum AVRounding rnd) av_const
 Rescale a 64-bit integer with specified rounding. More...
 
int64_t av_rescale_q (int64_t a, AVRational bq, AVRational cq) av_const
 Rescale a 64-bit integer by 2 rational numbers. More...
 
int64_t av_rescale_q_rnd (int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd) av_const
 Rescale a 64-bit integer by 2 rational numbers with specified rounding. More...
 
int av_compare_ts (int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
 Compare two timestamps each in its own time base. More...
 
int64_t av_compare_mod (uint64_t a, uint64_t b, uint64_t mod)
 Compare the remainders of two integer operands divided by a common divisor. More...
 
int64_t av_rescale_delta (AVRational in_tb, int64_t in_ts, AVRational fs_tb, int duration, int64_t *last, AVRational out_tb)
 Rescale a timestamp while preserving known durations. More...
 
int64_t av_add_stable (AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc)
 Add a value to a timestamp. More...
 

Macro Definition Documentation

#define M_E   2.7182818284590452354 /* e */

Definition at line 37 of file mathematics.h.

Referenced by get_qscale(), and nppscale_config_props().

#define M_LN2   0.69314718055994530942 /* log_e 2 */

Definition at line 40 of file mathematics.h.

Referenced by decode_frame(), and ff_sipr_decode_frame_16k().

#define M_LN10   2.30258509299404568402 /* log_e 10 */
#define M_LOG2_10   3.32192809488736234787 /* log_2 10 */

Definition at line 46 of file mathematics.h.

Referenced by ff_exp10(), and ff_exp10f().

#define M_PHI   1.61803398874989484820 /* phi / golden ratio */

Definition at line 49 of file mathematics.h.

Referenced by init_pattern_from_string(), and nppscale_config_props().

#define M_PI   3.14159265358979323846 /* pi */
Examples:
decoding_encoding.c, filter_audio.c, muxing.c, and resampling_audio.c.

Definition at line 52 of file mathematics.h.

Referenced by audio_encode_example(), audiogen(), av_display_rotation_get(), av_display_rotation_set(), biquad_init_coeffs(), block_angle(), build_basis(), build_filter(), butterworth_bp_filter(), butterworth_init_coeffs(), calc_channel_phases(), calc_input_response(), celt_exp_rotation(), chebyshev1_bp_filter(), chebyshev2_bp_filter(), color_range(), compute_sat_hue_metrics16(), compute_sat_hue_metrics8(), config_input(), config_output(), decode_init(), decode_init_static(), dequant_lsp10i(), dequant_lsp10r(), dequant_lsp16i(), dequant_lsp16r(), draw_curves(), ebur128_init_filter(), encode_init(), eval_expr(), evrc_decode_init(), factor(), fade_gain(), fadst4_1d(), fadst_1d(), fdct_1d(), ff_acelp_lsf2lspd(), ff_adx_calculate_coeffs(), ff_dct_init(), ff_generate_wave_table(), ff_generate_window_func(), ff_imdct15_init(), ff_init_ff_cos_tabs(), ff_init_mpadsp_tabs_TMPL(), ff_kbd_window_init(), ff_lpc_calc_ref_coefs_f(), ff_mdct_init(), ff_rdft_init(), ff_ref_dct_init(), ff_sine_window_init(), ff_sipr_init_16k(), ff_timefilter_new(), fft_ref_init(), fill_samples(), filter_frame(), filter_slice(), freq_gain(), generate_kernel(), get_input(), get_qscale(), hz_2_rad(), idct248_ref(), imc_decode_init(), init_cqt(), init_gaussian_filter(), init_idct(), init_imdct_window(), init_mdct_win(), init_tables(), initFilter(), lfo_get(), lfo_get_value(), lsf_decode_fp(), lspf2lpc(), main(), make_filters_from_proto(), nppscale_config_props(), open_audio(), ps_tableinit(), qdm2_fft_generate_tone(), qdm2_fft_tone_synthesizer(), read16_fft_bin(), read8_fft_bin(), set_highshelf_rbj(), set_lp_rbj(), sipr_decoder_init(), stabilize_lsps(), sws_getGaussianVec(), vorbis_floor0_decode(), wavesynth_init(), wma_lsp_to_curve_init(), wmavoice_decode_init(), wmavoice_flush(), and yae_reset().

#define M_PI_2   1.57079632679489661923 /* pi/2 */

Definition at line 55 of file mathematics.h.

Referenced by color_range(), config_input(), factor(), and update_context().

#define M_SQRT1_2   0.70710678118654752440 /* 1/sqrt(2) */
#define M_SQRT2   1.41421356237309504880 /* sqrt(2) */
#define NAN   av_int2float(0x7fc00000)

Definition at line 64 of file mathematics.h.

#define INFINITY   av_int2float(0x7f800000)

Definition at line 67 of file mathematics.h.