Write file with midi running status.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/midifile.rs b/src/midifile.rs
index aaa2dfd..00e20f5 100644
--- a/src/midifile.rs
+++ b/src/midifile.rs
@@ -105,14 +105,16 @@ fn write_varlen<W>(f: &mut W, v: u32) -> io::Result<()> where W: Write
     f.write_all(&buf[..])
 }
 
-fn write_raw_event<W>(f: &mut W, re: &RawMidiEvent) -> io::Result<()> where W: Write
+fn write_raw_event<W>(f: &mut W, re: &RawMidiEvent, runst: u8) -> io::Result<u8> where W: Write
 {
     let mut buf: Vec<u8> = Vec::new();
-    buf.push(re.ty);
+    if re.ty != runst || runst >= 0xf0 || re.ty >= 0xf0
+        { buf.push(re.ty); }
     buf.push(re.p1);
     if re.p2 < 0x80 { buf.push(re.p2); }
     for d in &re.data { buf.push(*d); }
-    f.write_all(&buf[..])
+    f.write_all(&buf[..])?;
+    Ok(re.ty)
 }
 
 fn write_track<W>(f: &mut W, trk: &MidiTrack) -> io::Result<()> where W: Write
@@ -121,13 +123,14 @@ fn write_track<W>(f: &mut W, trk: &MidiTrack) -> io::Result<()> where W: Write
     f.write_all(header)?;
     let mut buf: Vec<u8> = Vec::new();
     let mut curt = 0u32;
+    let mut runst = 0u8;
     for te in trk
     {
         let TimedMidiEvent{t, e} = te;
         write_varlen(&mut buf, t - curt)?;
         curt = *t;
         let re = RawMidiEvent::from(e);
-        write_raw_event(&mut buf, &re)?;
+        runst = write_raw_event(&mut buf, &re, runst)?;
     }
     write_u32be(f, buf.len() as u32)?;
     f.write_all(&buf[..])?;