From bdc1bdb61cf9a1163b10ff67a42e378dee8ab68c Mon Sep 17 00:00:00 2001
From: kevin <kevin@Currawong.local>
Date: Thu, 16 Jun 2016 12:50:43 -0400
Subject: [PATCH] cmMidiFile.h/c : Added cmMidiFileSetVelocity().

---
 cmMidiFile.c | 32 ++++++++++++++++++++++++++++++++
 cmMidiFile.h |  7 ++++++-
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/cmMidiFile.c b/cmMidiFile.c
index 672b2f9..873295f 100644
--- a/cmMidiFile.c
+++ b/cmMidiFile.c
@@ -1109,6 +1109,38 @@ const cmMidiTrackMsg_t** cmMidiFileMsgArray(    cmMidiFileH_t h )
   return (const cmMidiTrackMsg_t**)mfp->msgV;
 }
 
+
+cmMidiTrackMsg_t*  _cmMidiFileUidToMsg( _cmMidiFile_t* mfp, unsigned uid )
+{
+  unsigned i;
+
+  for(i=0; i<mfp->msgN; ++i)
+    if( mfp->msgV[i]->uid == uid )
+      return mfp->msgV[i];
+
+  return NULL;
+}
+
+cmMfRC_t cmMidiFileSetVelocity( cmMidiFileH_t h, unsigned uid, cmMidiByte_t vel )
+{
+  cmMidiTrackMsg_t* r;
+  _cmMidiFile_t* mfp = _cmMidiFileHandleToPtr(h);
+
+  assert( mfp != NULL );
+
+  if((r = _cmMidiFileUidToMsg(mfp,uid)) == NULL )
+    return cmErrMsg(&mfp->err,kUidNotFoundMfRC,"The MIDI file uid %i could not be found.",uid);
+
+  if( cmMidiIsNoteOn(r->status)==false && cmMidiIsNoteOff(r->status,0)==false )
+    return cmErrMsg(&mfp->err,kUidNotANoteMsgMfRC,"Cannot set velocity on a non-Note-On/Off msg.");
+  
+  cmMidiChMsg_t* chm = (cmMidiChMsg_t*)r->u.chMsgPtr;
+
+  chm->d1 = vel;
+
+  return kOkMfRC;
+}
+
 unsigned  cmMidiFileSeekUsecs( cmMidiFileH_t h, unsigned long long offsUSecs, unsigned* msgUsecsPtr, unsigned* microsPerTickPtr )
 {
   _cmMidiFile_t* p;
diff --git a/cmMidiFile.h b/cmMidiFile.h
index 6155476..34d3377 100644
--- a/cmMidiFile.h
+++ b/cmMidiFile.h
@@ -111,7 +111,9 @@ extern "C" {
     kInvalidStatusMfRC,  //  9
     kSustainPedalMfRC,   // 10
     kSostenutoPedalMfRC, // 11
-    kLargeDeltaTickMfRC  // 12 (a large delta tick value was filtered)
+    kLargeDeltaTickMfRC, // 12 (a large delta tick value was filtered)
+    kUidNotFoundMfRC,    // 13
+    kUidNotANoteMsgMfRC  // 14
   };
 
   extern cmMidiFileH_t cmMidiFileNullHandle;
@@ -156,6 +158,9 @@ extern "C" {
   // Returns NULL if 'h' is invalid.
   const cmMidiTrackMsg_t** cmMidiFileMsgArray( cmMidiFileH_t h );
 
+  // Set the velocity of a note-on/off msg identified by 'uid'.
+  cmMfRC_t             cmMidiFileSetVelocity( cmMidiFileH_t h, unsigned uid, cmMidiByte_t vel );
+
   // Return a pointer to the first msg at or after 'usecsOffs' or kInvalidIdx if no
   // msg exists after 'usecsOffs'.  Note that 'usecOffs' is an offset from the beginning
   // of the file.