etc
/
furnace
mirror of https://github.com/tildearrow/furnace.git
0
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

C140: fix possible overflow

This commit is contained in:
tildearrow 2023-08-19 23:39:27 -05:00
parent 993c5904e2
commit f3167d2fc9
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/engine/platform/sound/c140.c
View File

@ -5,7 +5,7 @@
MODIFIED Namco C140 sound emulator - MODIFIED VERSION
by cam900
MODIFICATION by tildearrow - adds muting function
MODIFICATION by tildearrow - adds muting function and fixes overflow
THIS IS NOT THE ORIGINAL VERSION - you can find the original one in
commit 72d04777c013988ed8cf6da27c62a9d784a59dff
@ -99,8 +99,8 @@ void c140_voice_tick(struct c140_t *c140, const unsigned char v, const int cycle
s1 = c140->mulaw[(s1 >> 8) & 0xff];
s2 = c140->mulaw[(s2 >> 8) & 0xff];
}
// interpolate
signed int sample = s1 + (((voice->frac) * (s2 - s1)) >> 16);
// interpolate (originally was >>16, but I had to reduce it to 15 to prevent overflow)
signed int sample = s1 + (((voice->frac >> 1) * (s2 - s1)) >> 15);
voice->lout = sample * voice->lvol;
voice->rout = sample * voice->rvol;
}