Revision 310d4424

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libavutil/lfg.h
30 30 
void av_lfg_init(AVLFG *c, unsigned int seed);
31 31 

  		




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/**


  		




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 * Gets the next random unsigned 32bit number.


  		




  
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 * Gets the next random unsigned 32bit number using a ALFG.


  		




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 *


  		




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 * Please also consider a simple LCG like state= state*1664525+1013904223,


  		




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 * it may be good enough and faster for your specific use case.


  		




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    return c->state[c->index++ & 63];


  		




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}


  		




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/**


  		




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


  		




  
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 *


  		




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


  		




  
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 */


  		




  
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static inline unsigned int av_mlfg_get(AVLFG *c){


  		




  
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    unsigned int a= c->state[(c->index-55) & 63];


  		




  
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    unsigned int b= c->state[(c->index-24) & 63];


  		




  
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    return c->state[c->index++ & 63] = a*b+a+b;


  		




  
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}


  		




  
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#endif //FFMPEG_LFG_H


  		












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