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fix symmetric fade-shape (still variable number of steps)

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Robin Gareus
2014-05-29 20:53:18 +02:00
parent 7953df93bf
commit c6930c1aef
1 changed files with 4 additions and 4 deletions
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8
libs/ardour/audioregion.cc
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@@ -1032,10 +1032,10 @@ AudioRegion::set_fade_in (FadeShape shape, framecnt_t len)
_fade_in->fast_simple_add (0.5 * len, 0.6);
//now generate a fade-out curve by successively applying a gain drop
const double breakpoint = 0.7; //linear for first 70%
for (int i = 2; i < num_steps; i++) {
for (int i = max(2, (int)ceil(num_steps / 9.0)); i < num_steps; i++) {
const double offset = 1.0 - breakpoint;
float coeff = 1.0 - breakpoint;
coeff *= powf(0.5, (i-1) * 7.0 / (double)num_steps); // -6dB per step for 7 steps
coeff *= powf(0.5, i * 9.0 / (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);
@@ -1111,10 +1111,10 @@ AudioRegion::set_fade_out (FadeShape shape, framecnt_t len)
//now generate a fade-out curve by successively applying a gain drop
const double breakpoint = 0.7; //linear for first 70%
for (int i = 2; i < num_steps; i++) {
for (int i = max(2, (int)ceil(num_steps / 9.0)); i < num_steps; i++) {
const double offset = 1.0 - breakpoint;
float coeff = 1.0 - breakpoint;
coeff *= powf(0.5, (i-1) * 7.0 / (double)num_steps); // -6dB per step for 7 steps
coeff *= powf(0.5, i * 9.0 / (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);