libavutil/lfg.h File Reference

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Data Structures
struct	AVLFG
Functions
void	av_lfg_init (AVLFG *c, unsigned int seed)
static unsigned int	av_lfg_get (AVLFG *c)
	Gets the next random unsigned 32-bit number using an ALFG.
static unsigned int	av_mlfg_get (AVLFG *c)
	Gets the next random unsigned 32-bit number using a MLFG.
void	av_bmg_get (AVLFG *lfg, double out[2])
	Gets the next two numbers generated by a Box-Muller Gaussian generator using the random numbers issued by lfg.

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Function Documentation

void av_bmg_get	(	AVLFG *	lfg,
		double	out[2]
	)

Gets the next two numbers generated by a Box-Muller Gaussian generator using the random numbers issued by lfg.

Parameters:

out[2]

array where are placed the two generated numbers

Definition at line 43 of file lfg.c.

static unsigned int av_lfg_get

(

AVLFG *

c

)

[inline, static]

Gets the next random unsigned 32-bit number using an ALFG.

Please also consider a simple LCG like state= state*1664525+1013904223, it may be good enough and faster for your specific use case.

Definition at line 38 of file lfg.h.

Referenced by ac3_decode_transform_coeffs_ch(), av_bmg_get(), dct_error(), ff_eac3_apply_spectral_extension(), ff_eac3_decode_transform_coeffs_aht_ch(), fill_random(), frandom(), get_high_utility_cell(), http_parse_request(), idct248_error(), idx_to_quant(), main(), mpc8_decode_frame(), nelly_decode_block(), rtmp_handshake(), rtsp_cmd_setup(), scalar_dequant_float(), and start_multicast().

void av_lfg_init	(	AVLFG *	c,
		unsigned int	seed
	)

Definition at line 28 of file lfg.c.

Referenced by ac3_decode_init(), cook_decode_init(), dct_error(), decode_init(), fill_random(), idct248_error(), main(), mpc7_decode_init(), mpc8_decode_init(), roq_encode_init(), and rtmp_handshake().

static unsigned int av_mlfg_get

(

AVLFG *

c

)

[inline, static]

Gets the next random unsigned 32-bit number using a MLFG.

Please also consider av_lfg_get() above, it is faster.

Definition at line 48 of file lfg.h.