libvlc: expose events for the audio mute status (refs #14568)

Cc: Harald Sitter <sitter@kde.org>

include/vlc/libvlc_events.h

@@ -79,6 +79,8 @@ enum libvlc_event_e {
     libvlc_MediaPlayerESSelected,
     libvlc_MediaPlayerCorked,
     libvlc_MediaPlayerUncorked,
+    libvlc_MediaPlayerMuted,
+    libvlc_MediaPlayerUnmuted,
 
     libvlc_MediaListItemAdded=0x200,
     libvlc_MediaListWillAddItem,

lib/event.c

@@ -285,6 +285,8 @@ static const event_name_t event_list[] = {
     DEF(MediaPlayerESSelected)
     DEF(MediaPlayerCorked)
     DEF(MediaPlayerUncorked)
+    DEF(MediaPlayerMuted)
+    DEF(MediaPlayerUnmuted)
 
     DEF(MediaListItemAdded)
     DEF(MediaListWillAddItem)

lib/media_player.c

@@ -71,6 +71,10 @@ static int
 corks_changed(vlc_object_t *obj, const char *name, vlc_value_t old,
               vlc_value_t cur, void *opaque);
 
+static int
+mute_changed(vlc_object_t *obj, const char *name, vlc_value_t old,
+             vlc_value_t cur, void *opaque);
+
 static void
 add_es_callbacks( input_thread_t *p_input_thread, libvlc_media_player_t *p_mi );
 
@@ -483,6 +487,23 @@ static int corks_changed(vlc_object_t *obj, const char *name, vlc_value_t old,
     return VLC_SUCCESS;
 }
 
+static int mute_changed(vlc_object_t *obj, const char *name, vlc_value_t old,
+                        vlc_value_t cur, void *opaque)
+{
+    libvlc_media_player_t *mp = (libvlc_media_player_t *)obj;
+
+    if (old.b_bool != cur.b_bool)
+    {
+        libvlc_event_t event;
+
+        event.type = cur.b_bool ? libvlc_MediaPlayerMuted
+                                : libvlc_MediaPlayerUnmuted;
+        libvlc_event_send(mp->p_event_manager, &event);
+    }
+    VLC_UNUSED(name); VLC_UNUSED(opaque);
+    return VLC_SUCCESS;
+}
+
 /**************************************************************************
  * Create a Media Instance object.
  *
@@ -660,8 +681,11 @@ libvlc_media_player_new( libvlc_instance_t *instance )
     register_event(mp, ESSelected);
     register_event(mp, Corked);
     register_event(mp, Uncorked);
+    register_event(mp, Muted);
+    register_event(mp, Unmuted);
 
     var_AddCallback(mp, "corks", corks_changed, NULL);
+    var_AddCallback(mp, "mute", mute_changed, NULL);
 
     /* Snapshot initialization */
     register_event(mp, SnapshotTaken);
@@ -713,6 +737,7 @@ static void libvlc_media_player_destroy( libvlc_media_player_t *p_mi )
                      "snapshot-file", snapshot_was_taken, p_mi );
 
     /* Detach callback from the media player / input manager object */
+    var_DelCallback( p_mi, "mute", mute_changed, NULL );
     var_DelCallback( p_mi, "corks", corks_changed, NULL );
 
     /* No need for lock_input() because no other threads knows us anymore */