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ffmpeg.wasm-core
Commit 2cf3c863 authored by Michael Niedermayer's avatar Michael Niedermayer
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Document av_lfg_get(). 

Originally committed as revision 14461 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent e80d4741
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libavutil/lfg.h
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...@@ -29,6 +29,12 @@ typedef struct { ...@@ -29,6 +29,12 @@ typedef struct {
void av_lfg_init(AVLFG *c, unsigned int seed); void av_lfg_init(AVLFG *c, unsigned int seed);
/**
* Gets the next random unsigned 32bit number.
*
* Please also consider a simple LCG like state= state*1664525+1013904223,
* it may be good enough and faster for your specific use case.
*/
static inline unsigned int av_lfg_get(AVLFG *c){ static inline unsigned int av_lfg_get(AVLFG *c){
c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63]; c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
return c->state[c->index++ & 63]; return c->state[c->index++ & 63];
......
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