[LAD] random curiosity

[Gabriel M. Beddingfield]

On Wed, 27 Jan 2010, cal wrote:

> Jens M Andreasen wrote:
>> [ ... ]
>> I am surprised that nobody so far has suggested using the key and
>> velocity as a "salt" to differentiate a single stream of randomness?
>
> If you don't mind, how would one go about "salting" it?

One way that comes to mind:

     unsigned short int note, velocity;
     // ...

     unsigned int salt = ((velocity & 0x7F)<<7) | (note & 0x7F);
     struct random_data seed;

     srandom_r(salt, &seed);

Thus, if you repeat the note with identical velocity... 
you'll always get the same random-number sequence.

-gabriel