StemRoller: desktop stem separator, Android stems player, and server daemons
- stemroller/: PySide6/QML desktop app and player for separating music into stems - android/: Plex music player that plays per-stem mixes, with Android Auto support, a graphic + parametric (Equalizer APO-style) EQ, and offline downloads - server/: stemserve (serves stems to the app) and stemd (separates the library on the server's GPU, with "Stem Now" priority requests) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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import QtQuick
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// The stem faders as an Excel column chart. Drag a column to set its level; double-click
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// for 0 dB. Below each category: M(ute) and S(olo).
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Rectangle {
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id: ch
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color: "#FFFFFF"
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border.color: "#D9D9D9"
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readonly property var stems: player.stems
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readonly property int n: stems.length
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readonly property real unity: 0.8
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T {
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id: title
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anchors.horizontalCenter: parent.horizontalCenter
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y: 6
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text: "Stem Mix"
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font.family: cellFont
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font.pixelSize: 17
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color: X.chartText
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}
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Item {
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id: plot
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x: 34
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y: title.y + title.height + 18
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width: parent.width - x - 8
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height: parent.height - y - 52
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// value axis: fader position, 0 dB marked
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Repeater {
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model: [0, 0.25, 0.5, 0.8, 1.0]
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delegate: Item {
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required property var modelData
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y: plot.height * (1 - modelData)
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width: plot.width
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Rectangle { width: parent.width; height: 1; color: modelData === 0.8 ? "#A6A6A6" : X.chartLine }
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T {
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x: -32
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width: 28
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y: -7
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height: 14
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horizontalAlignment: Text.AlignRight
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font.family: cellFont
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font.pixelSize: 11
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color: X.chartText
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text: modelData === 0 ? "-∞" : modelData === 0.8 ? "0 dB" : modelData === 1 ? "+4" : (40 * Math.log(modelData / 0.8) / Math.LN10).toFixed(0)
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}
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}
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}
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Repeater {
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model: ch.stems
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delegate: Item {
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id: cat
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required property int index
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required property var modelData
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readonly property real cw: plot.width / Math.max(1, ch.n)
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x: index * cw
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width: cw
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height: plot.height
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Rectangle {
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id: bar
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anchors.horizontalCenter: parent.horizontalCenter
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width: cat.cw * 0.62
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height: Math.max(1, plot.height * cat.modelData.level)
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y: plot.height - height
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color: cat.modelData.color
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opacity: cat.modelData.audible ? 1 : 0.22
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border.color: dm.containsMouse || dm.pressed ? "#404040" : "transparent"
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Behavior on height { enabled: !dm.pressed; NumberAnimation { duration: X.easeMs; easing.type: Easing.OutCubic } }
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}
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T { // data label
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anchors.horizontalCenter: parent.horizontalCenter
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y: bar.y - 16
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font.family: cellFont
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font.pixelSize: 11
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color: X.chartText
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text: cat.modelData.muted ? "Muted" : !cat.modelData.audible ? "—" : cat.modelData.level <= 0.001 ? "-∞" : (cat.modelData.db >= 0 ? "+" : "") + cat.modelData.db.toFixed(1)
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}
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MouseArea {
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id: dm
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anchors.fill: parent
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hoverEnabled: true
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cursorShape: Qt.SizeVerCursor
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function set(m) { player.setLevel(cat.index, Math.max(0, Math.min(1, 1 - m.y / plot.height))) }
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onPressed: (m) => set(m)
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onPositionChanged: (m) => { if (pressed) set(m) }
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onDoubleClicked: player.setLevel(cat.index, ch.unity)
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onWheel: (w) => player.setLevel(cat.index, Math.max(0, Math.min(1, cat.modelData.level + (w.angleDelta.y > 0 ? 0.02 : -0.02))))
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}
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Tip { target: dm; text: cat.modelData.label + ": drag to set, double-click for 0 dB" }
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// category axis label and the M / S toggles
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Column {
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y: plot.height + 4
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anchors.horizontalCenter: parent.horizontalCenter
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spacing: 3
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T {
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anchors.horizontalCenter: parent.horizontalCenter
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font.family: cellFont
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font.pixelSize: 12
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color: X.chartText
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text: cat.modelData.label
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width: Math.min(implicitWidth, cat.cw)
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}
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Row {
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anchors.horizontalCenter: parent.horizontalCenter
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spacing: 2
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Toggle { label: "M"; on: cat.modelData.muted; onFill: X.bad; onText: X.badText; tip: "Mute " + cat.modelData.label; onClicked: player.toggleMute(cat.index) }
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Toggle { label: "S"; on: cat.modelData.solo; onFill: X.neutral; onText: X.neutralText; tip: "Solo " + cat.modelData.label; onClicked: player.toggleSolo(cat.index) }
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}
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}
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}
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}
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Rectangle { y: plot.height; width: plot.width; height: 1; color: "#BFBFBF" }
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}
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component Toggle: Rectangle {
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id: tg
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property string label
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property bool on: false
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property color onFill
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property color onText
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property string tip
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signal clicked()
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width: 18
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height: 18
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color: on ? onFill : tgm.containsMouse ? "#F2F2F2" : "#FFFFFF"
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border.color: on ? onText : "#BFBFBF"
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T { anchors.centerIn: parent; text: tg.label; font.pixelSize: 11; font.bold: tg.on; color: tg.on ? tg.onText : X.inkSoft }
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MouseArea { id: tgm; anchors.fill: parent; hoverEnabled: true; onClicked: tg.clicked() }
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Tip { target: tgm; text: tg.tip }
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}
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}
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