+enum {
+ SET_MUTE=1,
+ SET_VOLUME=2,
+ INCREMENT_VOLUME=4,
+ TOGGLE_MUTE=8
+};
+
+/*****************************************************************************
+ * doVolumeChanges : handle all volume changes. Internal use only to ease
+ * variables locking.
+ *****************************************************************************/
+static
+int doVolumeChanges( unsigned action, vlc_object_t * p_object, int i_nb_steps,
+ audio_volume_t i_volume, audio_volume_t * i_return_volume,
+ bool b_mute )
+{
+ int i_result = VLC_SUCCESS;
+ int i_volume_step = 1, i_new_volume = 0;
+ bool b_var_mute = false;
+ aout_instance_t *p_aout = findAout( p_object );
+
+ if ( p_aout ) aout_lock_volume( p_aout );
+
+ b_var_mute = var_GetBool( p_object, "volume-muted");
+
+ const bool b_unmute_condition = ( b_var_mute
+ && ( /* Unmute: on increments */
+ ( action == INCREMENT_VOLUME )
+ || /* On explicit unmute */
+ ( ( action == SET_MUTE ) && !b_mute )
+ || /* On toggle from muted */
+ ( action == TOGGLE_MUTE )
+ ));
+
+ const bool b_mute_condition = ( !b_var_mute
+ && ( /* explicit */
+ ( ( action == SET_MUTE ) && b_mute )
+ || /* or toggle */
+ ( action == TOGGLE_MUTE )
+ ));
+
+ /* If muting or unmuting when play hasn't started */
+ if ( action == SET_MUTE && !b_unmute_condition && !b_mute_condition )
+ {
+ if ( p_aout )
+ {
+ aout_unlock_volume( p_aout );
+ vlc_object_release( p_aout );
+ }
+ return i_result;
+ }
+
+ /* On UnMute */
+ if ( b_unmute_condition )
+ {
+ /* Restore saved volume */
+ i_volume = var_GetInteger( p_object, "saved-volume" );
+ var_SetBool( p_object, "volume-muted", false );
+ }
+ else if ( b_mute_condition )
+ {
+ /* We need an initial value to backup later */
+ i_volume = config_GetInt( p_object, "volume" );
+ }
+
+ if ( action == INCREMENT_VOLUME )
+ {
+ i_volume_step = var_InheritInteger( p_object, "volume-step" );
+
+ if ( !b_unmute_condition )
+ i_volume = config_GetInt( p_object, "volume" );
+
+ i_new_volume = (int) i_volume + i_volume_step * i_nb_steps;
+
+ if ( i_new_volume > AOUT_VOLUME_MAX )
+ i_volume = AOUT_VOLUME_MAX;
+ else if ( i_new_volume < AOUT_VOLUME_MIN )
+ i_volume = AOUT_VOLUME_MIN;
+ else
+ i_volume = i_new_volume;
+ }
+
+ var_SetInteger( p_object, "saved-volume" , i_volume );
+
+ /* On Mute */
+ if ( b_mute_condition )
+ {
+ i_volume = AOUT_VOLUME_MIN;
+ var_SetBool( p_object, "volume-muted", true );
+ }
+
+ /* Commit volume changes */
+ config_PutInt( p_object, "volume", i_volume );
+
+ if ( p_aout )
+ {
+ aout_lock_mixer( p_aout );
+ aout_lock_input_fifos( p_aout );
+ if ( p_aout->p_mixer )
+ i_result = p_aout->output.pf_volume_set( p_aout, i_volume );
+ aout_unlock_input_fifos( p_aout );
+ aout_unlock_mixer( p_aout );
+ }
+
+ /* trigger callbacks */
+ var_TriggerCallback( p_object, "volume-change" );
+ if ( p_aout )
+ {
+ var_SetBool( p_aout, "intf-change", true );
+ aout_unlock_volume( p_aout );
+ vlc_object_release( p_aout );
+ }
+
+ if ( i_return_volume != NULL )
+ *i_return_volume = i_volume;
+ return i_result;
+}
+
+#undef aout_VolumeGet