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Round of Code Cleanup;

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lwvmobile
2023-07-28 17:47:33 -04:00
parent 56a5df86a0
commit 3bac7ba99b
8 changed files with 34 additions and 951 deletions
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20
src/dsd_upsample.c
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@@ -136,3 +136,23 @@ upsample (dsd_state * state, float invalue)
}
}
//produce 6 short samples (48k) for every 1 short sample (8k)
void upsampleS (short invalue, short prev, short outbuf[6])
{
float c, d;
c = prev;
d = invalue;
// basic triangle interpolation
outbuf[0] = c = ((invalue * (float) 0.166) + (c * (float) 0.834));
outbuf[1] = c = ((invalue * (float) 0.332) + (c * (float) 0.668));
outbuf[2] = c = ((invalue * (float) 0.500) + (c * (float) 0.5));
outbuf[3] = c = ((invalue * (float) 0.668) + (c * (float) 0.332));
outbuf[4] = c = ((invalue * (float) 0.834) + (c * (float) 0.166));
outbuf[5] = c = d;
prev = d; //shift prev to the last d value for the next repitition
}