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Symmetric x-fade, use equivalent of -6dB per step for 7 steps.

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This commit is contained in:
Robin Gareus 2014-05-29 16:59:04 +02:00
parent 2d82446f59
commit 7953df93bf
1 changed files with 2 additions and 6 deletions
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8
libs/ardour/audioregion.cc
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@ -1035,9 +1035,7 @@ AudioRegion::set_fade_in (FadeShape shape, framecnt_t len)
for (int i = 2; i < num_steps; i++) {
const double offset = 1.0 - breakpoint;
float coeff = 1.0 - breakpoint;
for (int j = 0; j < i; j++) {
coeff *= 0.5; //6dB drop per step
}
coeff *= powf(0.5, (i-1) * 7.0 / (double)num_steps); // -6dB per step for 7 steps
_fade_in->fast_simple_add (len * (breakpoint + (offset * (double)i / (double)num_steps)), coeff);
}
_fade_in->fast_simple_add (len, VERY_SMALL_SIGNAL);
@ -1116,9 +1114,7 @@ AudioRegion::set_fade_out (FadeShape shape, framecnt_t len)
for (int i = 2; i < num_steps; i++) {
const double offset = 1.0 - breakpoint;
float coeff = 1.0 - breakpoint;
for (int j = 0; j < i; j++) {
coeff *= 0.5; // 6dB drop per step
}
coeff *= powf(0.5, (i-1) * 7.0 / (double)num_steps); // -6dB per step for 7 steps
_fade_out->fast_simple_add (len * (breakpoint + (offset * (double)i / (double)num_steps)), coeff);
}
_fade_out->fast_simple_add (len, VERY_SMALL_SIGNAL);