Commit FS#12069 - Playback rework - first stages. Gives as thorough as possible a treatment of codec management, track change and metadata logic as possible while maintaining fairly narrow focus and not rewriting everything all at once. Please see the rockbox-dev mail archive on 2011-04-25 (Playback engine rework) for a more thorough manifest of what was addressed. Plugins and codecs become incompatible.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29785 a1c6a512-1295-4272-9138-f99709370657
diff --git a/apps/pcmbuf.h b/apps/pcmbuf.h
index 618b1ba..b7bf8c2 100644
--- a/apps/pcmbuf.h
+++ b/apps/pcmbuf.h
@@ -33,13 +33,21 @@
 void pcmbuf_play_stop(void);
 void pcmbuf_pause(bool pause);
 void pcmbuf_monitor_track_change(bool monitor);
-void pcmbuf_start_track_change(bool manual_skip);
+bool pcmbuf_start_track_change(bool manual_skip);
 
 /* Crossfade */
 #ifdef HAVE_CROSSFADE
 bool pcmbuf_is_crossfade_active(void);
 void pcmbuf_request_crossfade_enable(bool on_off);
 bool pcmbuf_is_same_size(void);
+#else
+/* Dummy functions with sensible returns */
+static inline bool pcmbuf_is_crossfade_active(void)
+    { return false; }
+static inline void pcmbuf_request_crossfade_enable(bool on_off)
+    { return; (void)on_off; }
+static inline bool pcmbuf_is_same_size(void)
+    { return true; }
 #endif
 
 /* Voice */