diff options
author | Christian Pointner <equinox@helsinki.at> | 2016-01-27 23:00:36 (GMT) |
---|---|---|
committer | Christian Pointner <equinox@helsinki.at> | 2016-01-27 23:00:36 (GMT) |
commit | f02da6a0850b2115101fd5bbc3367135e80f4f54 (patch) | |
tree | ac95b80ae054a2523edaa07c98da1de0b1593da4 /src/rhlibrary/vumeter_widget.go | |
parent | d05ebe8503985f65b918945b869f295a9595ca5e (diff) |
moved vu meter to seperate file
Diffstat (limited to 'src/rhlibrary/vumeter_widget.go')
-rw-r--r-- | src/rhlibrary/vumeter_widget.go | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/rhlibrary/vumeter_widget.go b/src/rhlibrary/vumeter_widget.go new file mode 100644 index 0000000..323e826 --- /dev/null +++ b/src/rhlibrary/vumeter_widget.go @@ -0,0 +1,220 @@ +// +// 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 +) + +func init() { + var err error + if meterBarCSS, err = gtk.CssProviderNew(); err != nil { + panic(err.Error()) + } + err = meterBarCSS.LoadFromData(` +.level-bar { + -GtkLevelBar-min-block-width: 13; + -GtkLevelBar-min-block-height: 8; +} +.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 { + panic(err.Error()) + } +} + +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 + } + sc.AddProvider(meterBarCSS, 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 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(length time.Duration, pos time.Duration, meter player.Meter, userdata interface{}) bool { + glib.IdleAdd(func() { + ch := len(meter) + lval := &vuMeterLevel{0, 0, 0} + rval := &vuMeterLevel{0, 0, 0} + if ch >= 2 { + lval.setLevel(meter[0].Peak) + rval.setLevel(meter[1].Peak) + } else if ch == 1 { + lval.setLevel(meter[0].Peak) + rval = lval + } + left.SetValue(lval) + right.SetValue(rval) + }) + 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) + + 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 + } + return frame, nil +} |