[banshee] libbanshee: Only call volume set callback on Mac (bgo#686908)

[Andrés Aragoneses <aaragoneses src gnome org>]

commit d8ae526714a18a773af4bf5e5d6b10cdc5644ec1
Author: Timo Dörr <timo latecrew de>
Date:   Mon Sep 2 14:47:27 2013 +0200

    libbanshee: Only call volume set callback on Mac (bgo#686908)
    
    The fix[1] for bgo#660012[2] created the regression of not remembering the
    volume of the last session. By making this fix only apply to Mac platform
    we essentially go back to Banshee 2.4.x behaviour of displaying no apparent
    audio volume, in Linux, until a track is played. Fixes bgo#686908.
    
    [1] https://git.gnome.org/browse/banshee/commit/?id=96ee436bbf95bad7565e494555695f797f0382d0
    [2] https://bugzilla.gnome.org/show_bug.cgi?id=660012
    [3] https://bugzilla.gnome.org/show_bug.cgi?id=686908
    
    Signed-off-by: Andrés G. Aragoneses <knocte gmail com>

 libbanshee/banshee-player-pipeline.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libbanshee/banshee-player-pipeline.c b/libbanshee/banshee-player-pipeline.c
index ed845f3..4dae104 100644
--- a/libbanshee/banshee-player-pipeline.c
+++ b/libbanshee/banshee-player-pipeline.c
@@ -360,9 +360,12 @@ _bp_pipeline_construct (BansheePlayer *player)
     player->volume = gst_element_factory_make ("volume", NULL);
     g_return_val_if_fail (player->volume != NULL, FALSE);
 
+// gstreamer on OS X does not call the callback upon initialization (see bgo#680917)
+#ifdef __APPLE__
     // call the volume changed callback once so the volume from the pipeline is
     // set in the player object
     bp_volume_changed_callback (player->playbin, NULL, player);
+#endif
 
     audiosinkqueue = gst_element_factory_make ("queue", "audiosinkqueue");
     g_return_val_if_fail (audiosinkqueue != NULL, FALSE);