UI: Add ability to lock volume

UI/data/locale/en-US.ini

@@ -93,6 +93,7 @@ Fullscreen="Fullscreen"
 Windowed="Windowed"
 Percent="Percent"
 AspectRatio="Aspect Ratio <b>%1:%2</b>"
+LockVolume="Lock Volume"
 
 # warning if program already open
 AlreadyRunning.Title="OBS is already running"

UI/volume-control.cpp

@@ -276,6 +276,11 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 	VolumeChanged();
 }
 
+void VolControl::EnableSlider(bool enable)
+{
+	slider->setEnabled(enable);
+}
+
 VolControl::~VolControl()
 {
 	obs_fader_remove_callback(obs_fader, OBSVolumeChanged, this);

UI/volume-control.hpp

@@ -252,4 +252,6 @@ public:
 
 	void SetMeterDecayRate(qreal q);
 	void setPeakMeterType(enum obs_peak_meter_type peakMeterType);
+
+	void EnableSlider(bool enable);
 };

UI/window-basic-main.cpp

@@ -2842,12 +2842,38 @@ void OBSBasic::MixerRenameSource()
 	}
 }
 
+static inline bool SourceVolumeLocked(obs_source_t *source)
+{
+	obs_data_t *priv_settings = obs_source_get_private_settings(source);
+	bool lock = obs_data_get_bool(priv_settings, "volume_locked");
+	obs_data_release(priv_settings);
+
+	return lock;
+}
+
+void OBSBasic::LockVolumeControl(bool lock)
+{
+	QAction *action = reinterpret_cast<QAction *>(sender());
+	VolControl *vol = action->property("volControl").value<VolControl *>();
+	obs_source_t *source = vol->GetSource();
+
+	obs_data_t *priv_settings = obs_source_get_private_settings(source);
+	obs_data_set_bool(priv_settings, "volume_locked", lock);
+	obs_data_release(priv_settings);
+
+	vol->EnableSlider(!lock);
+}
+
 void OBSBasic::VolControlContextMenu()
 {
 	VolControl *vol = reinterpret_cast<VolControl *>(sender());
 
 	/* ------------------- */
 
+	QAction lockAction(QTStr("LockVolume"), this);
+	lockAction.setCheckable(true);
+	lockAction.setChecked(SourceVolumeLocked(vol->GetSource()));
+
 	QAction hideAction(QTStr("Hide"), this);
 	QAction unhideAllAction(QTStr("UnhideAll"), this);
 	QAction mixerRenameAction(QTStr("Rename"), this);
@@ -2870,6 +2896,8 @@ void OBSBasic::VolControlContextMenu()
 		&OBSBasic::HideAudioControl, Qt::DirectConnection);
 	connect(&unhideAllAction, &QAction::triggered, this,
 		&OBSBasic::UnhideAllAudioControls, Qt::DirectConnection);
+	connect(&lockAction, &QAction::toggled, this,
+		&OBSBasic::LockVolumeControl, Qt::DirectConnection);
 	connect(&mixerRenameAction, &QAction::triggered, this,
 		&OBSBasic::MixerRenameSource, Qt::DirectConnection);
 
@@ -2895,6 +2923,8 @@ void OBSBasic::VolControlContextMenu()
 
 	hideAction.setProperty("volControl",
 			       QVariant::fromValue<VolControl *>(vol));
+	lockAction.setProperty("volControl",
+			       QVariant::fromValue<VolControl *>(vol));
 	mixerRenameAction.setProperty("volControl",
 				      QVariant::fromValue<VolControl *>(vol));
 
@@ -2916,6 +2946,8 @@ void OBSBasic::VolControlContextMenu()
 		pasteFiltersAction.setEnabled(true);
 
 	QMenu popup;
+	popup.addAction(&lockAction);
+	popup.addSeparator();
 	popup.addAction(&unhideAllAction);
 	popup.addAction(&hideAction);
 	popup.addAction(&mixerRenameAction);
@@ -3019,6 +3051,8 @@ void OBSBasic::ActivateAudioSource(OBSSource source)
 					"VerticalVolControl");
 	VolControl *vol = new VolControl(source, true, vertical);
 
+	vol->EnableSlider(!SourceVolumeLocked(source));
+
 	double meterDecayRate =
 		config_get_double(basicConfig, "Audio", "MeterDecayRate");
 	vol->SetMeterDecayRate(meterDecayRate);

UI/window-basic-main.hpp

@@ -660,6 +660,8 @@ private slots:
 	void TBarChanged(int value);
 	void TBarReleased();
 
+	void LockVolumeControl(bool lock);
+
 private:
 	/* OBS Callbacks */
 	static void SceneReordered(void *data, calldata_t *params);