ardour/livetrax
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merge new symmetric curve from mixbus, fix errors in fade out slow curve, tweak display of xfades so that the non-upper-fade is slightly less dominant (alpha)

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git-svn-id: svn://localhost/ardour2/branches/3.0@12384 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2012-05-22 21:23:22 +00:00
parent 930f9a34c1
commit f9030dd220
2 changed files with 39 additions and 30 deletions
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6
gtk2_ardour/audio_region_view.cc
View File

@ -1568,7 +1568,8 @@ AudioRegionView::redraw_start_xfade_to (boost::shared_ptr<AudioRegion> ar, frame
if (!start_xfade_out) {
start_xfade_out = new ArdourCanvas::Line (*group);
start_xfade_out->property_width_pixels() = 1;
start_xfade_out->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_GainLine.get();
uint32_t col = UINT_RGBA_CHANGE_A (ARDOUR_UI::config()->canvasvar_GainLine.get(), 125);
start_xfade_out->property_fill_color_rgba() = col;
}
if (!start_xfade_rect) {
@ -1673,7 +1674,8 @@ AudioRegionView::redraw_end_xfade_to (boost::shared_ptr<AudioRegion> ar, framecn
if (!end_xfade_out) {
end_xfade_out = new ArdourCanvas::Line (*group);
end_xfade_out->property_width_pixels() = 1;
end_xfade_out->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_GainLine.get();
uint32_t col UINT_RGBA_CHANGE_A (ARDOUR_UI::config()->canvasvar_GainLine.get(), 125);
end_xfade_out->property_fill_color_rgba() = col;
}
if (!end_xfade_rect) {

57
libs/ardour/audioregion.cc
View File

@ -106,6 +106,7 @@ generate_inverse_coefficient_curve (boost::shared_ptr<Evoral::ControlList> dst,
static void
generate_db_fade (boost::shared_ptr<Evoral::ControlList> dst, double len, int num_steps, float dB_drop)
{
dst->clear ();
dst->fast_simple_add (0, 1);
//generate a fade-out curve by successively applying a gain drop
@ -1019,6 +1020,8 @@ AudioRegion::set_fade_in (FadeShape shape, framecnt_t len)
generate_db_fade (c1, len, 10, -1); // start off with a slow fade
generate_db_fade (c2, len, 10, -80); // end with a fast fade
merge_curves (_fade_in, c1, c2);
reverse_curve (c3, _fade_in);
_fade_in->copy_events (*c3);
generate_inverse_power_curve (_inverse_fade_in, _fade_in);
break;
@ -1032,20 +1035,22 @@ AudioRegion::set_fade_in (FadeShape shape, framecnt_t len)
break;
case FadeSymmetric:
// starts kind of like a constant power but has a slower fadeout
// however it is NOT constant power and there will be a level drop in the middle of the crossfade
c1->fast_simple_add (0.0, 1.0);
for ( int i = 1; i < 9; i++ ) {
float dist = (float)i/10.0;
c1->fast_simple_add ((len * dist), cos(dist*M_PI/10.0));
//start with a nearly linear cuve
_fade_in->fast_simple_add (0, 1);
_fade_in->fast_simple_add (0.5*len, 0.6);
//now generate a fade-out curve by successively applying a gain drop
const float breakpoint = 0.7; //linear for first 70%
const int num_steps = 9;
for (int i = 2; i < num_steps; i++) {
float coeff = (1.0-breakpoint);
for (int j = 0; j < i; j++) {
coeff *= 0.5; //6dB drop per step
}
c1->fast_simple_add (len, VERY_SMALL_SIGNAL);
//curve 2 is a slow fade at end
generate_db_fade (c2, len, 10, -30 );
merge_curves (c3, c1, c2);
reverse_curve (_fade_in, c3);
_fade_in->fast_simple_add (len* (breakpoint+((1.0-breakpoint)*(double)i/(double)num_steps)), coeff);
}
_fade_in->fast_simple_add (len, VERY_SMALL_SIGNAL);
reverse_curve (c3, _fade_in);
_fade_in->copy_events (*c3);
reverse_curve (_inverse_fade_in, _fade_in );
break;
}
@ -1108,19 +1113,21 @@ AudioRegion::set_fade_out (FadeShape shape, framecnt_t len)
break;
case FadeSymmetric:
//starts kind of like a constant power but has a slower fadeout
//however it is NOT constant power and there will be a level drop in the middle of the crossfade
c1->fast_simple_add (0.0, 1.0);
for ( int i = 1; i < 9; i++ ) {
float dist = (float)i/10.0;
c1->fast_simple_add ((len * dist), cos(dist*M_PI/10.0)); //cheesy way of making a flat line
//start with a nearly linear cuve
_fade_out->fast_simple_add (0, 1);
_fade_out->fast_simple_add (0.5*len, 0.6);
//now generate a fade-out curve by successively applying a gain drop
const float breakpoint = 0.7; //linear for first 70%
const int num_steps = 9;
for (int i = 2; i < num_steps; i++) {
float coeff = (1.0-breakpoint);
for (int j = 0; j < i; j++) {
coeff *= 0.5; //6dB drop per step
}
c1->fast_simple_add (len, VERY_SMALL_SIGNAL);
//curve 2 is a slow fade at end
generate_db_fade (c2, len, 10, -30);
merge_curves (_fade_out, c1, c2);
_fade_out->fast_simple_add (len* (breakpoint+((1.0-breakpoint)*(double)i/(double)num_steps)), coeff);
}
_fade_out->fast_simple_add (len, VERY_SMALL_SIGNAL);
reverse_curve (_inverse_fade_out, _fade_out);
break;
}