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sof: drc: fix drc_inv_fixed function 

Used ABS(x) instead of x for comparing to ONE_OVERT_SQRT2(~0.707)
because x could be a negative value and here we want to transfrom x
from range (-1, -0.5];[0.5, 1) to (-1, -0.707];[0.707, 1)

And revised code line 233~237 to be easier to understand.

Signed-off-by: Pin-chih Lin <johnylin@google.com>
This commit is contained in:
Pin-chih Lin 2021-02-04 17:42:58 +08:00 committed by Liam Girdwood
parent b0facccfc8
commit 90f7ac47b2
1 changed files with 7 additions and 6 deletions
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13
src/audio/drc/drc_math_generic.c
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@ -207,6 +207,7 @@ inline int32_t drc_inv_fixed(int32_t x, int precision_x, int precision_y)
const int32_t A1 = Q_CONVERT_FLOAT(-21.25031280517578125f, qc);
const int32_t A0 = Q_CONVERT_FLOAT(7.152250766754150390625f, qc);
int e;
int precision_inv;
int sqrt2_extracted = 0;
int32_t x2, x4; /* Q2.30 */
int32_t A5Xx, A3Xx;
@ -214,7 +215,7 @@ inline int32_t drc_inv_fixed(int32_t x, int precision_x, int precision_y)
x = rexp_fixed(x, precision_x, &e); /* Q2.30 */
if (x < ONE_OVER_SQRT2) {
if (ABS(x) < ONE_OVER_SQRT2) {
x = q_mult(x, SQRT2, 30, 30, 30);
sqrt2_extracted = 1;
}
@ -229,11 +230,11 @@ inline int32_t drc_inv_fixed(int32_t x, int precision_x, int precision_y)
if (sqrt2_extracted)
inv = q_mult(inv, SQRT2, qc, 30, qc);
e += qc;
if (e > precision_y)
return Q_SHIFT_RND(inv, e, precision_y);
if (e < precision_y)
return Q_SHIFT_LEFT(inv, e, precision_y);
precision_inv = e + qc;
if (precision_inv > precision_y)
return Q_SHIFT_RND(inv, precision_inv, precision_y);
if (precision_inv < precision_y)
return Q_SHIFT_LEFT(inv, precision_inv, precision_y);
return inv;
#undef qc
}