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audioconvert: use faster noise generator

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This commit is contained in:
Wim Taymans 2022-06-29 14:33:41 +02:00
parent 938f2b123e
commit 0b62cea4f9
1 changed files with 4 additions and 8 deletions
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12
spa/plugins/audioconvert/fmt-ops-c.c
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@ -736,15 +736,11 @@ conv_f64d_to_f32_c(struct convert *conv, void * SPA_RESTRICT dst[], const void *
} }
} }
/* 32 bit xorshift PRNG, see https://en.wikipedia.org/wiki/Xorshift */
static inline int32_t static inline int32_t
xorshift(uint32_t *state) lcnoise(uint32_t *state)
{ {
uint32_t x = *state; *state = (*state * 96314165) + 907633515;
x ^= x << 13; return (int32_t)(*state);
x ^= x >> 17;
x ^= x << 5;
return (int32_t)(*state = x);
} }
static inline void update_dither_c(struct convert *conv, uint32_t n_samples) static inline void update_dither_c(struct convert *conv, uint32_t n_samples)
@ -754,7 +750,7 @@ static inline void update_dither_c(struct convert *conv, uint32_t n_samples)
uint32_t *state = &conv->random[0]; uint32_t *state = &conv->random[0];
for (n = 0; n < n_samples; n++) for (n = 0; n < n_samples; n++)
dither[n] = xorshift(state) * scale; dither[n] = lcnoise(state) * scale;
} }
void void