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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
meterSegments float64 = 30 // meter has 30 elements
meterOffsetGreen float64 = meterSegments - 4
meterOffsetOrange float64 = meterSegments - 2
meterOffsetRed float64 = meterSegments - 1
)
var (
levelBarCss *gtk.CssProvider
)
func init() {
var err error
if levelBarCss, err = gtk.CssProviderNew(); err != nil {
panic(err.Error())
}
err = levelBarCss.LoadFromData(`
.level-bar {
-GtkLevelBar-min-block-width: 13;
-GtkLevelBar-min-block-height: 8;
}
.level-bar.fill-block.level-green {
border-color: #00AE00;
background-image: linear-gradient(to bottom, #36FF36, #00AE00);
}
.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 {
panic(err.Error())
}
}
func addPlayButton(grid *gtk.Grid, p *player.PlayerChan) (err error) {
var btn *gtk.Button
if btn, err = gtk.ButtonNewFromIconName("media-playback-start", gtk.ICON_SIZE_DIALOG); err != nil {
return
}
btn.Connect("clicked", func(_ *gtk.Button) {
if err := p.Play(); err != nil {
rhdl.Println(err) // TODO: feedback at GUI?
}
})
grid.Add(btn)
return
}
func addPauseButton(grid *gtk.Grid, p *player.PlayerChan) (err error) {
var btn *gtk.Button
if btn, err = gtk.ButtonNewFromIconName("media-playback-pause", gtk.ICON_SIZE_DIALOG); err != nil {
return
}
btn.Connect("clicked", func(_ *gtk.Button) {
if err := p.Pause(); err != nil {
rhdl.Println(err) // TODO: feedback at GUI?
}
})
grid.Add(btn)
return
}
func addStopButton(grid *gtk.Grid, p *player.PlayerChan) (err error) {
var btn *gtk.Button
if btn, err = gtk.ButtonNewFromIconName("media-playback-stop", gtk.ICON_SIZE_DIALOG); err != nil {
return
}
btn.Connect("clicked", func(_ *gtk.Button) {
if err := p.Stop(); err != nil {
rhdl.Println(err) // TODO: feedback at GUI?
}
})
grid.Add(btn)
return
}
func calcMeterLevel(valdb float64) (val float64) {
val = valdb + meterDBFloor
if val < 0 {
val = 0
} else {
val = (val / meterDBFloor) * meterSegments
}
return
}
func createMeterBar() (bar *gtk.LevelBar, err error) {
if bar, err = gtk.LevelBarNewForInterval(0, meterSegments); 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
}
sc.AddProvider(levelBarCss, 600) // TOOD: hardcoded value
bar.AddOffsetValue("green", meterOffsetGreen)
bar.AddOffsetValue("orange", meterOffsetOrange)
bar.AddOffsetValue("red", meterOffsetRed)
return
}
func addMeter(grid *gtk.Grid, p *player.PlayerChan) (err error) {
var mgrid *gtk.Grid
if mgrid, err = gtk.GridNew(); err != nil {
return
}
mgrid.SetOrientation(gtk.ORIENTATION_VERTICAL)
mgrid.SetColumnSpacing(3)
var left, right *gtk.LevelBar
if left, err = createMeterBar(); err != nil {
return
}
if right, err = createMeterBar(); err != nil {
return
}
p.AddUpdateHandler(func(length time.Duration, pos time.Duration, meter player.Meter, userdata interface{}) bool {
glib.IdleAdd(func() {
ch := len(meter)
lval := float64(0)
rval := float64(0)
if ch >= 2 {
lval = calcMeterLevel(meter[0].Peak)
rval = calcMeterLevel(meter[1].Peak)
} else if ch == 1 {
lval = calcMeterLevel(meter[0].Peak)
rval = lval
}
left.SetValue(lval)
right.SetValue(rval)
})
return true
}, nil)
mgrid.Add(left)
mgrid.Add(right)
grid.Add(mgrid)
return
}
func getPlayerWidget(p *player.PlayerChan) (gtk.IWidget, error) {
var err error
var grid *gtk.Grid
if grid, err = gtk.GridNew(); err != nil {
return nil, err
}
grid.SetOrientation(gtk.ORIENTATION_HORIZONTAL)
grid.SetColumnSpacing(3)
if err = addPlayButton(grid, p); err != nil {
return nil, err
}
if err = addPauseButton(grid, p); err != nil {
return nil, err
}
if err = addStopButton(grid, p); err != nil {
return nil, err
}
if err = addMeter(grid, p); err != nil {
return nil, err
}
var frame *gtk.Frame
if frame, err = gtk.FrameNew("player"); err != nil {
return nil, err
}
frame.Add(grid)
return frame, nil
}
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