FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
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_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
}
 

Functions

int64_t av_const av_gcd (int64_t a, int64_t b)
 Return the greatest common divisor of a and b. 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) 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) 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 2 timestamps each in its own timebases. More...
 
int64_t av_compare_mod (uint64_t a, uint64_t b, uint64_t mod)
 Compare 2 integers modulo mod. 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 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 */
#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 */
#define M_PI_2   1.57079632679489661923 /* pi/2 */

Definition at line 49 of file mathematics.h.

Referenced by config_input(), 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 58 of file mathematics.h.

#define INFINITY   av_int2float(0x7f800000)

Definition at line 61 of file mathematics.h.