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//
// rhlibrary
//
// The Radio Helsinki Rivendell Library
//
//
// Copyright (C) 2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhlibrary.
//
// rhlibrary is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhlibrary is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhlibrary. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"time"
"code.helsinki.at/rhrd-go/player"
"github.com/gotk3/gotk3/glib"
"github.com/gotk3/gotk3/gtk"
)
const (
meterDBFloor float64 = 72 // -72 db is the lowest VU value
meterSegmentsGreen float64 = 21
meterSegmentsOrange float64 = 3
meterSegmentsRed float64 = 1
meterSegmentsTotal float64 = meterSegmentsGreen + meterSegmentsOrange + meterSegmentsRed
)
var (
meterBarCSS *gtk.CssProvider = nil
)
func getMeterBarCSS() (*gtk.CssProvider, error) {
if meterBarCSS != nil {
return meterBarCSS, nil
}
var err error
if meterBarCSS, err = gtk.CssProviderNew(); err != nil {
return nil, err
}
err = meterBarCSS.LoadFromData(`
.level-bar {
-GtkLevelBar-min-block-width: 15;
-GtkLevelBar-min-block-height: 9;
}
.level-bar.trough {
border: 0;
padding: 0;
border-radius: 0;
background-image: unset;
}
.level-bar.fill-block.level-green {
border-color: #006600;
background-image: linear-gradient(to bottom, #36B736, #006600);
}
.level-bar.fill-block.level-orange {
border-color: #AE6600;
background-image: linear-gradient(to bottom, #FFAC36, #AE6600);
}
.level-bar.fill-block.level-red {
border-color: #AE0000;
background-image: linear-gradient(to bottom, #FF3636, #AE0000);
}`)
if err != nil {
return nil, err
}
return meterBarCSS, nil
}
type vuMeterLevel struct {
green float64
orange float64
red float64
}
func (lvl *vuMeterLevel) setLevel(valdb float64) {
val := valdb + meterDBFloor
if val < 0 {
val = 0
} else {
val = (val / meterDBFloor) * meterSegmentsTotal
}
lvl.green = val
lvl.orange = val - meterSegmentsGreen
lvl.red = lvl.orange - meterSegmentsOrange
if lvl.orange < 0 {
lvl.orange = 0
}
if lvl.red < 0 {
lvl.red = 0
}
return
}
type vuMeter struct {
green *gtk.LevelBar
orange *gtk.LevelBar
red *gtk.LevelBar
}
func createMeterBar(segments float64) (bar *gtk.LevelBar, err error) {
if bar, err = gtk.LevelBarNewForInterval(0, segments); err != nil {
return
}
bar.SetMode(gtk.LEVEL_BAR_MODE_DISCRETE)
bar.RemoveOffsetValue(gtk.LEVEL_BAR_OFFSET_LOW)
bar.RemoveOffsetValue(gtk.LEVEL_BAR_OFFSET_HIGH)
var sc *gtk.StyleContext
if sc, err = bar.GetStyleContext(); err != nil {
return
}
var cp *gtk.CssProvider
if cp, err = getMeterBarCSS(); err != nil {
return
}
sc.AddProvider(cp, 600) // TOOD: hardcoded value
return
}
func newVUMeter() (meter *vuMeter, err error) {
meter = &vuMeter{}
if meter.green, err = createMeterBar(meterSegmentsGreen); err != nil {
return
}
if meter.orange, err = createMeterBar(meterSegmentsOrange); err != nil {
return
}
if meter.red, err = createMeterBar(meterSegmentsRed); err != nil {
return
}
meter.green.AddOffsetValue("green", 0)
meter.orange.AddOffsetValue("orange", 0)
meter.red.AddOffsetValue("red", 0)
return
}
func (m *vuMeter) SetValue(lvl *vuMeterLevel) {
m.green.SetValue(lvl.green)
m.orange.SetValue(lvl.orange)
m.red.SetValue(lvl.red)
}
func updateVUMeterLevels(left, right *vuMeter, data player.Meter) {
ch := len(data)
lval := &vuMeterLevel{0, 0, 0}
rval := &vuMeterLevel{0, 0, 0}
if ch >= 2 {
lval.setLevel(data[0].Peak)
rval.setLevel(data[1].Peak)
} else if ch == 1 {
lval.setLevel(data[0].Peak)
rval = lval
}
left.SetValue(lval)
right.SetValue(rval)
}
func addVUMeterGrid(frame *gtk.Frame, p *player.PlayerChan) (err error) {
var grid *gtk.Grid
if grid, err = gtk.GridNew(); err != nil {
return
}
grid.SetRowSpacing(3)
var left, right *vuMeter
if left, err = newVUMeter(); err != nil {
return
}
if right, err = newVUMeter(); err != nil {
return
}
p.AddUpdateHandler(func(_ time.Duration, _ time.Duration, meter player.Meter, _ interface{}) bool {
glib.IdleAdd(func() { updateVUMeterLevels(left, right, meter) })
return true
}, nil)
grid.Attach(left.green, 1, 1, 1, 1)
grid.Attach(left.orange, 2, 1, 1, 1)
grid.Attach(left.red, 3, 1, 1, 1)
grid.Attach(right.green, 1, 2, 1, 1)
grid.Attach(right.orange, 2, 2, 1, 1)
grid.Attach(right.red, 3, 2, 1, 1)
grid.SetRowHomogeneous(true)
frame.Add(grid)
return
}
func getVUMeterWidget(p *player.PlayerChan) (gtk.IWidget, error) {
frame, err := gtk.FrameNew("")
if err != nil {
return nil, err
}
var cp *gtk.CssProvider
if cp, err = gtk.CssProviderNew(); err != nil {
return nil, err
}
if err = cp.LoadFromData(".frame { padding: 3px; }"); err != nil {
return nil, err
}
var sc *gtk.StyleContext
if sc, err = frame.GetStyleContext(); err != nil {
return nil, err
}
sc.AddProvider(cp, 600) // TOOD: hardcoded value
if err = addVUMeterGrid(frame, p); err != nil {
return nil, err
}
var box *gtk.Box
if box, err = gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 7); err != nil {
return nil, err
}
box.PackStart(frame, false, false, 3)
return box, nil
}
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