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filter-chain: simplify biquads

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This commit is contained in:
Wim Taymans 2023-06-30 17:49:29 +02:00
parent d5d8ebeaac
commit c13696aca1
2 changed files with 26 additions and 38 deletions
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48
spa/plugins/audioconvert/crossover.c
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@ -22,17 +22,16 @@ void lr4_set(struct lr4 *lr4, enum biquad_type type, float freq)
void lr4_process(struct lr4 *lr4, float *dst, const float *src, const float vol, int samples)
{
float lx1 = lr4->x1;
float lx2 = lr4->x2;
float ly1 = lr4->y1;
float ly2 = lr4->y2;
float lz1 = lr4->z1;
float lz2 = lr4->z2;
float lb0 = lr4->bq.b0;
float lb1 = lr4->bq.b1;
float lb2 = lr4->bq.b2;
float la1 = lr4->bq.a1;
float la2 = lr4->bq.a2;
float x1 = lr4->x1;
float x2 = lr4->x2;
float y1 = lr4->y1;
float y2 = lr4->y2;
float b0 = lr4->bq.b0;
float b1 = lr4->bq.b1;
float b2 = lr4->bq.b2;
float a1 = lr4->bq.a1;
float a2 = lr4->bq.a2;
float x, y, z;
int i;
if (vol == 0.0f) {
@ -47,24 +46,19 @@ void lr4_process(struct lr4 *lr4, float *dst, const float *src, const float vol,
}
for (i = 0; i < samples; i++) {
float x, y, z;
x = src[i];
y = lb0*x + lb1*lx1 + lb2*lx2 - la1*ly1 - la2*ly2;
z = lb0*y + lb1*ly1 + lb2*ly2 - la1*lz1 - la2*lz2;
lx2 = lx1;
lx1 = x;
ly2 = ly1;
ly1 = y;
lz2 = lz1;
lz1 = z;
x = src[i];
y = b0 * x + x1;
x1 = b1 * x - a1 * y + x2;
x2 = b2 * x - a2 * y;
z = b0 * y + y1;
y1 = b1 * y - a1 * z + y2;
y2 = b2 * y - a2 * z;
dst[i] = z * vol;
}
#define F(x) (-FLT_MIN < (x) && (x) < FLT_MIN ? 0.0f : (x))
lr4->x1 = F(lx1);
lr4->x2 = F(lx2);
lr4->y1 = F(ly1);
lr4->y2 = F(ly2);
lr4->z1 = F(lz1);
lr4->z2 = F(lz2);
lr4->x1 = F(x1);
lr4->x2 = F(x2);
lr4->y1 = F(y1);
lr4->y2 = F(y2);
#undef F
}