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| author | Max Kellermann <max@duempel.org> | 2009-01-03 14:51:47 +0100 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2009-01-13 23:09:19 +0100 |
| commit | a0141dbe4f868413d78c94737846279124415479 (patch) | |
| tree | e917b22e3eced7f9a8d9a4fa9e1121b899246a86 /src/pcm_utils.c | |
| parent | d93477d1369e55d76476952f30463461e47af443 (diff) | |
| download | mpd-a0141dbe4f868413d78c94737846279124415479.tar.gz mpd-a0141dbe4f868413d78c94737846279124415479.tar.xz mpd-a0141dbe4f868413d78c94737846279124415479.zip | |
pcm_utils: use the custom PRNG for volume dithering
Don't use libc's rand() function, because it is slow. Our own trivial
linear congruential generator is good enough for dithering.
Diffstat (limited to '')
| -rw-r--r-- | src/pcm_utils.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/pcm_utils.c b/src/pcm_utils.c index f73df8aef..3ce9b5fd0 100644 --- a/src/pcm_utils.c +++ b/src/pcm_utils.c @@ -18,6 +18,7 @@ #include "pcm_utils.h" #include "pcm_channels.h" +#include "pcm_prng.h" #include "log.h" #include "utils.h" #include "conf.h" @@ -31,7 +32,12 @@ static inline int pcm_dither(void) { - return (rand() & 511) - (rand() & 511); + static unsigned long state; + uint32_t r; + + r = state = prng(state); + + return (r & 511) - ((r >> 9) & 511); } /** |