Issue 5167/6: Changes: show \markup xxx = ... \etc assignments

[lilypond.git] / lily / control-track-performer.cc

diff --git a/lily/control-track-performer.cc b/lily/control-track-performer.cc
index 84f8044b4728a45b5248c43b7663cb3f9d2e3f78..3846e3102da6c8c0ce2572480ee49d878b70efd9 100644 (file)
--- a/lily/control-track-performer.cc
+++ b/lily/control-track-performer.cc
@@ -13,7 +13,7 @@ class Control_track_performer : public Performer
 {
   Audio_staff *control_track_;
 
-  void add_text (Audio_text::Type, string);
+  void add_text (Audio_text::Type, const string&);
   TRANSLATOR_DECLARATIONS (Control_track_performer);
 protected:
 
@@ -21,7 +21,8 @@ protected:
   virtual void acknowledge_audio_element (Audio_element_info info);
 };
 
-Control_track_performer::Control_track_performer ()
+Control_track_performer::Control_track_performer (Context *c)
+  : Performer (c)
 {
   control_track_ = 0;
 }
@@ -40,7 +41,7 @@ Control_track_performer::acknowledge_audio_element (Audio_element_info info)
 }
 
 void
-Control_track_performer::add_text (Audio_text::Type text_type, string str)
+Control_track_performer::add_text (Audio_text::Type text_type, const string &str)
 {
   Audio_item *text = new Audio_text (text_type, str);
   control_track_->add_audio_item (text);
@@ -52,16 +53,26 @@ Control_track_performer::add_text (Audio_text::Type text_type, string str)
 void
 Control_track_performer::initialize ()
 {
-  control_track_ = new Audio_staff;
+  control_track_ = new Audio_control_track_staff;
   announce_element (Audio_element_info (control_track_, 0));
 
   string id_string = String_convert::pad_to (gnu_lilypond_version_string (), 30);
 
+  // The first audio element in the control track is a placeholder for the
+  // name of the MIDI sequence.  The actual name is stored in the element
+  // later before outputting the track (in Performance::output, see
+  // performance.cc).
   add_text (Audio_text::TRACK_NAME, "control track");
   add_text (Audio_text::TEXT, "creator: ");
   add_text (Audio_text::TEXT, id_string);
 }
 
+void
+Control_track_performer::boot ()
+{
+
+}
+
 ADD_TRANSLATOR (Control_track_performer,
                 /* doc */
                 "",