Add application volume mixer

config/dot/quickshell/modules/settings/ApplicationMixer.qml

@@ -0,0 +1,48 @@
+import Quickshell.Services.Pipewire
+import QtQuick
+
+import qs.config
+import qs.services
+
+Column {
+    id: root
+
+    property var applications: AudioDevices.applications
+    property bool pipewireReady: Pipewire.ready
+
+    readonly property int rowCount: applicationRepeater.count
+    readonly property string statusText: {
+        if (!root.pipewireReady)
+            return "PipeWire is unavailable";
+        if (root.applications.length === 0)
+            return "Applications playing sound will appear here";
+        return "";
+    }
+
+    width: parent ? parent.width : 620
+    spacing: 8
+
+    Repeater {
+        id: applicationRepeater
+        model: root.applications
+
+        ApplicationVolumeRow {
+            required property var modelData
+
+            width: root.width
+            application: modelData
+        }
+    }
+
+    Text {
+        width: parent.width
+        visible: root.statusText !== ""
+        text: root.statusText
+        color: Theme.fgDim
+        font.family: Theme.fontFamily
+        font.pixelSize: Theme.fontSize
+        horizontalAlignment: Text.AlignHCenter
+        topPadding: 18
+        bottomPadding: 18
+    }
+}

config/dot/quickshell/modules/settings/ApplicationVolumeRow.qml

@@ -0,0 +1,106 @@
+import Quickshell.Services.Pipewire
+import QtQuick
+
+import qs.config
+import qs.modules.quicksettings
+import qs.services
+import qs.widgets
+
+Rectangle {
+    id: root
+
+    required property var application
+
+    readonly property real volume: AudioDevices.applicationVolume(root.application)
+    readonly property bool muted: AudioDevices.applicationMuted(root.application)
+
+    width: parent ? parent.width : 620
+    implicitHeight: 78
+    radius: Theme.cardRadius
+    color: Theme.alpha(Theme.fg, 0.025)
+    border.width: 1
+    border.color: Theme.alpha(Theme.fg, 0.07)
+
+    PwObjectTracker {
+        objects: root.application?.nodes ?? []
+    }
+
+    ThemedIcon {
+        id: applicationIcon
+        anchors.left: parent.left
+        anchors.leftMargin: 12
+        anchors.top: parent.top
+        anchors.topMargin: 11
+        size: 20
+        icon: root.application?.icon ?? "audio-x-generic-symbolic"
+        iconFallback: "audio-x-generic-symbolic"
+        tint: Theme.fg
+    }
+
+    Column {
+        anchors.left: applicationIcon.right
+        anchors.leftMargin: 10
+        anchors.right: parent.right
+        anchors.rightMargin: 12
+        anchors.verticalCenter: applicationIcon.verticalCenter
+        spacing: 1
+
+        Text {
+            width: parent.width
+            text: root.application?.label ?? "Unknown application"
+            color: Theme.fg
+            font.family: Theme.fontFamily
+            font.pixelSize: Theme.fontSize
+            font.weight: Font.Medium
+            elide: Text.ElideRight
+        }
+
+        Text {
+            width: parent.width
+            visible: (root.application?.nodes?.length ?? 0) > 1
+            text: `${root.application?.nodes?.length ?? 0} audio streams`
+            color: Theme.fgDim
+            font.family: Theme.fontFamily
+            font.pixelSize: Theme.fontSizeSmall
+        }
+    }
+
+    IconButton {
+        id: muteButton
+        anchors.left: parent.left
+        anchors.leftMargin: 8
+        anchors.bottom: parent.bottom
+        anchors.bottomMargin: 6
+        size: 30
+        iconSize: 17
+        icon: root.muted || root.volume <= 0.001
+            ? "audio-volume-muted-symbolic"
+            : "audio-volume-high-symbolic"
+        iconFallback: "audio-volume-high-symbolic"
+        onClicked: AudioDevices.setApplicationMuted(root.application, !root.muted)
+    }
+
+    ValueSlider {
+        anchors.left: muteButton.right
+        anchors.leftMargin: 7
+        anchors.right: volumeText.left
+        anchors.rightMargin: 10
+        anchors.verticalCenter: muteButton.verticalCenter
+        value: root.muted ? 0 : root.volume
+        onMoved: value => AudioDevices.setApplicationVolume(root.application, value)
+    }
+
+    Text {
+        id: volumeText
+        anchors.right: parent.right
+        anchors.rightMargin: 12
+        anchors.verticalCenter: muteButton.verticalCenter
+        width: 38
+        text: Math.round(root.volume * 100) + "%"
+        color: Theme.fgDim
+        font.family: Theme.fontMono
+        font.features: Theme.tabularFigures
+        font.pixelSize: Theme.fontSizeSmall
+        horizontalAlignment: Text.AlignRight
+    }
+}

config/dot/quickshell/modules/settings/AudioBalance.qml

@@ -32,7 +32,7 @@ SettingRow {
 
     readonly property int leftIndex: root.channelIndex(PwAudioChannel.FrontLeft)
     readonly property int rightIndex: root.channelIndex(PwAudioChannel.FrontRight)
-    readonly property bool available: root.node?.audio
+    readonly property bool available: !!root.node?.audio
         && root.leftIndex >= 0 && root.rightIndex >= 0
         && root.node.audio.volumes.length > Math.max(root.leftIndex, root.rightIndex)
 

config/dot/quickshell/modules/settings/SoundPage.qml

@@ -31,6 +31,15 @@ SettingsPage {
         }
     }
 
+    SettingsCard {
+        title: "Applications"
+        subtitle: "Control each application currently playing through PipeWire."
+
+        ApplicationMixer {
+            width: parent.width
+        }
+    }
+
     SettingsCard {
         title: "Sound feedback"
         subtitle: "Use the same event preferences as GTK and GNOME applications."
@@ -67,8 +76,8 @@ SettingsPage {
         title: "Advanced sound"
 
         ActionRow {
-            label: "Application volumes and profiles"
+            label: "Device profiles"
-            detail: "Open Fedora's complete sound panel"
+            detail: "Open Fedora's complete device profile panel"
             divider: false
             action: "Open panel"
             onTriggered: SystemSettings.openGnomePanel("sound")

config/dot/quickshell/modules/settings/qmldir

@@ -46,6 +46,8 @@ PasswordField 1.0 PasswordField.qml
 AudioBalance 1.0 AudioBalance.qml
 SoundDeviceList 1.0 SoundDeviceList.qml
 SoundDeviceRow 1.0 SoundDeviceRow.qml
+ApplicationMixer 1.0 ApplicationMixer.qml
+ApplicationVolumeRow 1.0 ApplicationVolumeRow.qml
 TimeOfDayRow 1.0 TimeOfDayRow.qml
 LocationPicker 1.0 LocationPicker.qml
 FontPicker 1.0 FontPicker.qml

config/dot/quickshell/sound-page-harness.qml

@@ -9,11 +9,55 @@ import qs.services
 import qs.modules.settings
 
 ShellRoot {
+    id: root
+
+    QtObject {
+        id: fixtureAudio
+        property real volume: 0.42
+        property bool muted: false
+    }
+
+    QtObject {
+        id: fixtureNode
+        property QtObject audio: fixtureAudio
+    }
+
+    readonly property var fixtureApplication: ({
+        key: "fixture.player",
+        label: "Fixture Player",
+        icon: "audio-x-generic-symbolic",
+        nodes: [fixtureNode]
+    })
+
     SoundPage {
         width: 760
         height: 900
     }
 
+    ApplicationMixer {
+        id: populatedMixer
+        width: 620
+        visible: false
+        applications: [root.fixtureApplication]
+        pipewireReady: true
+    }
+
+    ApplicationMixer {
+        id: emptyMixer
+        width: 620
+        visible: false
+        applications: []
+        pipewireReady: true
+    }
+
+    ApplicationMixer {
+        id: unavailableMixer
+        width: 620
+        visible: false
+        applications: []
+        pipewireReady: false
+    }
+
     PwObjectTracker {
         objects: AudioDevices.outputs.concat(AudioDevices.inputs)
     }
@@ -26,8 +70,15 @@ ShellRoot {
                 ready: Pipewire.ready,
                 outputs: AudioDevices.outputs.length,
                 inputs: AudioDevices.inputs.length,
+                applications: AudioDevices.applications.length,
                 defaultOutput: AudioDevices.label(AudioDevices.current(true)),
-                defaultInput: AudioDevices.label(AudioDevices.current(false))
+                defaultInput: AudioDevices.label(AudioDevices.current(false)),
+                populatedRows: populatedMixer.rowCount,
+                populatedStatus: populatedMixer.statusText,
+                emptyRows: emptyMixer.rowCount,
+                emptyStatus: emptyMixer.statusText,
+                unavailableRows: unavailableMixer.rowCount,
+                unavailableStatus: unavailableMixer.statusText
             });
         }
     }

tests/quickshell/sound-page-contract.sh

@@ -10,6 +10,8 @@ repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
 sound_page="$repo_dir/config/dot/quickshell/modules/settings/SoundPage.qml"
 device_list="$repo_dir/config/dot/quickshell/modules/settings/SoundDeviceList.qml"
 device_row="$repo_dir/config/dot/quickshell/modules/settings/SoundDeviceRow.qml"
+application_mixer="$repo_dir/config/dot/quickshell/modules/settings/ApplicationMixer.qml"
+application_row="$repo_dir/config/dot/quickshell/modules/settings/ApplicationVolumeRow.qml"
 balance="$repo_dir/config/dot/quickshell/modules/settings/AudioBalance.qml"
 audio_devices="$repo_dir/config/dot/quickshell/services/AudioDevices.qml"
 sound_feedback="$repo_dir/config/dot/quickshell/services/SoundFeedback.qml"
@@ -17,6 +19,7 @@ quick_devices="$repo_dir/config/dot/quickshell/modules/quicksettings/AudioDevice
 harness="$repo_dir/config/dot/quickshell/sound-page-harness.qml"
 config_home="$(mktemp -d /tmp/panama-sound-config.XXXXXX)"
 state_home="$(mktemp -d /tmp/panama-sound-state.XXXXXX)"
+shell_log="$state_home/quickshell.log"
 
 fail() {
     printf 'sound page contract: %s\n' "$1" >&2
@@ -33,7 +36,7 @@ cleanup() {
 }
 trap cleanup EXIT
 
-for file in "$sound_page" "$device_list" "$device_row" "$balance" "$audio_devices" "$sound_feedback" "$quick_devices"; do
+for file in "$sound_page" "$device_list" "$device_row" "$application_mixer" "$application_row" "$balance" "$audio_devices" "$sound_feedback" "$quick_devices"; do
     [[ -f "$file" ]] || fail "missing ${file#"$repo_dir/"}"
 done
 
@@ -61,6 +64,8 @@ rg -Fq 'root.node.audio.volumes = next;' "$balance" || fail 'balance does not wr
 
 [[ "$(rg -c 'SoundDeviceList \{' "$sound_page")" -eq 2 ]] || fail 'Sound page does not expose output and input device lists'
 rg -Fq 'AudioBalance {' "$sound_page" || fail 'Sound page has no output balance control'
+rg -Fq 'ApplicationMixer {' "$sound_page" || fail 'Sound page has no Applications mixer'
+rg -Fq 'label: "Device profiles"' "$sound_page" || fail 'advanced handoff is not limited to device profiles'
 rg -Fq 'SystemSettings.openGnomePanel("sound")' "$sound_page" || fail 'advanced GNOME Sound handoff was removed'
 rg -Fq 'SoundFeedback.setEventSounds(checked)' "$sound_page" || fail 'event sounds are not controllable'
 rg -Fq 'SoundFeedback.setInputFeedback(checked)' "$sound_page" || fail 'input feedback sounds are not controllable'
@@ -76,7 +81,7 @@ printf 'sound page static contract: PASS\n'
 
 # Instantiate the complete page against the real, read-only PipeWire graph.
 # Merely constructing these controls must never change a default or volume.
-qs_for_harness --daemonize >/dev/null
+qs_for_harness --daemonize >"$shell_log" 2>&1
 for _ in $(seq 1 60); do
     qs_for_harness ipc show 2>/dev/null | rg -q '^target sound-page-test$' && break
     sleep 0.1
@@ -90,10 +95,18 @@ for _ in $(seq 1 60); do
     sleep 0.1
 done
 jq -e '.ready == true and .outputs > 0 and .inputs > 0
-    and (.defaultOutput | length > 0) and (.defaultInput | length > 0)' \
+    and .applications >= 0
+    and (.defaultOutput | length > 0) and (.defaultInput | length > 0)
+    and .populatedRows == 1 and .populatedStatus == ""
+    and .emptyRows == 0 and .emptyStatus == "Applications playing sound will appear here"
+    and .unavailableRows == 0 and .unavailableStatus == "PipeWire is unavailable"' \
     <<<"$status" >/dev/null \
     || fail "real PipeWire graph was not represented: $status"
 
+if rg -n 'ReferenceError|TypeError|Binding loop|Unable to assign|Cannot assign|PwObjectTracker' "$shell_log"; then
+    fail 'Sound page emitted a QML runtime warning'
+fi
+
 trap - EXIT
 cleanup
 printf 'sound page runtime: PASS (%s outputs, %s inputs)\n' \