dither_table_init highpass_tpdf_noise init_seed LAP mpg123_noise rand_xorshift32 tpdf_noise white_noise

static float rand_xorshift32 ( uint32_t *  seed ) [static] Definition at line 22 of file dither.c. Referenced by highpass_tpdf_noise(), tpdf_noise(), and white_noise(). { union { uint32_t i; float f; } fi; fi.i = *seed; fi.i ^= (fi.i<<13); fi.i ^= (fi.i>>17); fi.i ^= (fi.i<<5); *seed = fi.i; /* scale the number to [-0.5, 0.5] */ #ifdef IEEE_FLOAT fi.i = (fi.i>>9)|0x3f800000; fi.f -= 1.5f; #else fi.f = (double)fi.i / 4294967295.0; fi.f -= 0.5f; #endif return fi.f; }