refactor(audio): Remove unused OpenAL::outputVolume

audio/include/audio/iaudiocontrol.h

@@ -35,9 +35,6 @@
  * @var IAudioControl::AUDIO_FRAME_SAMPLE_COUNT
  * @brief Frame sample count
  *
- * @fn qreal IAudioControl::outputVolume() const
- * @brief Returns the current output volume (between 0 and 1)
- *
  * @fn void IAudioControl::setOutputVolume(qreal volume)
  * @brief Set the master output volume.
  *
@@ -105,7 +102,6 @@ class IAudioControl : public QObject
 
 public:
     virtual ~IAudioControl() = default;
-    virtual qreal outputVolume() const = 0;
     virtual void setOutputVolume(qreal volume) = 0;
     virtual qreal maxOutputVolume() const = 0;
     virtual qreal minOutputVolume() const = 0;

audio/src/backend/openal.cpp

@@ -121,23 +121,6 @@ void OpenAL::checkAlcError(ALCdevice* device) noexcept
         qWarning("OpenAL error: %d", alc_err);
 }
 
-/**
- * @brief Returns the current output volume (between 0 and 1)
- */
-qreal OpenAL::outputVolume() const
-{
-    QMutexLocker locker(&audioLock);
-
-    ALfloat volume = 0.0;
-
-    if (alOutDev) {
-        alGetListenerf(AL_GAIN, &volume);
-        checkAlError();
-    }
-
-    return volume;
-}
-
 /**
  * @brief Set the master output volume.
  *

audio/src/backend/openal.h

@@ -63,7 +63,6 @@ public:
     {
         return 0;
     }
-    qreal outputVolume() const;
     void setOutputVolume(qreal volume);
 
     qreal minInputGain() const;