From 6e5dc4eaee1ffb9474390dbd62a6dae4b90d8f5f Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Wed, 21 Dec 2022 23:56:03 -0500
Subject: Remove duplicate midi tempo events.

---
 src/convert.rs  |  3 ++-
 src/midifile.rs | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/convert.rs b/src/convert.rs
index 125e687..a96c802 100644
--- a/src/convert.rs
+++ b/src/convert.rs
@@ -3,7 +3,7 @@ use std::cell::RefCell;
 use std::rc::Rc;
 use crate::itfile::{ITFile, Cell};
 use crate::utils::Rational;
-use crate::midifile::{MidiEvent, TimedMidiEvent, MidiTrack, MidiFile, lint_track};
+use crate::midifile::{MidiEvent, TimedMidiEvent, MidiTrack, MidiFile, lint_track, lint_tempo};
 use crate::portmod::Effect;
 
 #[derive(Debug)]
@@ -410,6 +410,7 @@ impl<'a, 'b> Converter<'a, 'b>
             t: t.last().unwrap_or(&TimedMidiEvent{t: 0, e: MidiEvent::MetaEndOfTrack}).t,
             e: MidiEvent::MetaEndOfTrack}));
 
+        self.trks[0] = lint_tempo(&self.trks[0]);
         self.trks.iter().for_each(|t| { lint_track(t); });
     }
     pub fn result(self) -> MidiFile
diff --git a/src/midifile.rs b/src/midifile.rs
index 00e20f5..8210f70 100644
--- a/src/midifile.rs
+++ b/src/midifile.rs
@@ -137,6 +137,24 @@ fn write_track<W>(f: &mut W, trk: &MidiTrack) -> io::Result<()> where W: Write
     Ok(())
 }
 
+pub fn lint_tempo(trk: &MidiTrack) -> MidiTrack
+{
+    trk.iter().fold((f64::NAN, Vec::new()), |(last, mut t), e| {
+        match e.e
+        {
+            MidiEvent::MetaTempo(x) => {
+                if x != last
+                {
+                    t.push(e.clone());
+                    (x, t)
+                }
+                else { (last , t) }
+            },
+            _ => { t.push(e.clone()); (last, t) }
+        }
+    }).1
+}
+
 pub fn lint_track(trk: &MidiTrack) -> bool
 {
     let mut ret = true;
-- 
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