FFmpeg: libavutil/mathematics.h File Reference

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libavutil

Macros | Enumerations | Functions

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_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
}

Functions

int64_t av_const av_gcd (int64_t a, int64_t b)

Return the greatest common divisor of a and b.

int64_t av_rescale (int64_t a, int64_t b, int64_t c) av_const

Rescale a 64-bit integer with rounding to nearest.

int64_t av_rescale_rnd (int64_t a, int64_t b, int64_t c, enum AVRounding) av_const

Rescale a 64-bit integer with specified rounding.

int64_t av_rescale_q (int64_t a, AVRational bq, AVRational cq) av_const

Rescale a 64-bit integer by 2 rational numbers.

int64_t av_rescale_q_rnd (int64_t a, AVRational bq, AVRational cq, enum AVRounding) av_const

Rescale a 64-bit integer by 2 rational numbers with specified rounding.

int av_compare_ts (int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)

Compare 2 timestamps each in its own timebases.

int64_t av_compare_mod (uint64_t a, uint64_t b, uint64_t mod)

Compare 2 integers modulo mod.

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.

Macro Definition Documentation

#define M_E 2.7182818284590452354 /* e */

Definition at line 31 of file mathematics.h.

#define M_LN2 0.69314718055994530942 /* log_e 2 */

Definition at line 34 of file mathematics.h.

Referenced by decode_frame(), encode_block(), encode_init(), and ff_sipr_decode_frame_16k().

#define M_LN10 2.30258509299404568402 /* log_e 10 */

Definition at line 37 of file mathematics.h.

Referenced by acelp_decode_gain_codef(), calc_input_response(), decode_frame(), ff_acelp_decode_gain_code(), ff_sipr_decode_frame_16k(), init(), and swri_dither_init().

#define M_LOG2_10 3.32192809488736234787 /* log_2 10 */

Definition at line 40 of file mathematics.h.

Referenced by ff_amr_set_fixed_gain().

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

Definition at line 43 of file mathematics.h.

Referenced by init_pattern_from_string().

#define M_PI 3.14159265358979323846 /* pi */

Examples:: doc/examples/decoding_encoding.c, doc/examples/muxing.c, and doc/examples/resampling_audio.c.

Definition at line 46 of file mathematics.h.

Referenced by audio_encode_example(), audiogen(), biquad_init_coeffs(), block_angle(), build_basis(), build_filter(), butterworth_init_coeffs(), calc_input_response(), config(), config_output(), dct_ref(), decode_init(), decode_init_static(), dequant_lsp10i(), dequant_lsp10r(), dequant_lsp16i(), dequant_lsp16r(), encode_init(), eval_expr(), evrc_decode_init(), fade_gain(), ff_acelp_lsf2lspd(), ff_adx_calculate_coeffs(), ff_dct_init(), ff_init_ff_cos_tabs(), ff_init_mpadsp_tabs_TMPL(), ff_kbd_window_init(), 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(), generate_wave_table(), get_qscale(), idct248_ref(), idct_ref(), imc_decode_init(), imdct_ref(), init_atrac3_window(), init_idct(), init_mdct_win(), initFilter(), lsf_decode_fp(), lspf2lpc(), make_filters_from_proto(), mdct_ref(), open_audio(), plot_spectrum_column(), ps_tableinit(), qdm2_fft_generate_tone(), qdm2_fft_tone_synthesizer(), 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_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */

Definition at line 49 of file mathematics.h.

Referenced by auto_matrix(), avresample_build_matrix(), dca_decode_frame(), dca_filter_channels(), nelly_decode_block(), and ps_tableinit().

#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */

Definition at line 52 of file mathematics.h.

Referenced by avresample_build_matrix(), ff_adx_calculate_coeffs(), ff_timefilter_new(), and ps_tableinit().

#define NAN av_int2float(0x7fc00000)

Definition at line 55 of file mathematics.h.

#define INFINITY av_int2float(0x7f800000)

Definition at line 58 of file mathematics.h.

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