From: Devon Schudy <dschudy@gmail.com>
Date: Fri, 29 Nov 2013 03:00:02 +0000 (-0800)
Subject: Fix spurious error playing initial grace notes (issue 1412)
X-Git-Tag: release/2.19.0-1~120
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=6cec57bf0989098fce173703b894f7718bf9c10d;p=lilypond.git

Fix spurious error playing initial grace notes (issue 1412)

This happens because the MIDI output starts at tick 0, regardless of
when the first event is. Initial grace notes start start at negative
ticks, so midi_walker::output_event thinks they're out of order. Fixed
by starting at the first event.
---

diff --git a/lily/midi-walker.cc b/lily/midi-walker.cc
index b97630b0d1..0ae5265bd3 100644
--- a/lily/midi-walker.cc
+++ b/lily/midi-walker.cc
@@ -58,7 +58,9 @@ Midi_walker::Midi_walker (Audio_staff *audio_staff, Midi_track *track)
   index_ = 0;
   items_ = audio_staff->audio_items_;
   vector_sort (items_, audio_item_less);
-  last_tick_ = 0;
+  //Pieces that begin with grace notes start at negative times. This
+  //is OK - MIDI output doesn't use absolute ticks, only differences.
+  last_tick_ = items_.empty () ? 0 : items_[0]->audio_column_->ticks ();
   percussion_ = audio_staff->percussion_;
   merge_unisons_ = audio_staff->merge_unisons_;
 }