#! /usr/bin/python
import sys, os, mido

#**************************************
def GetMaxVelocity(midFile):
    rtn = 0
    rMid = MidiFile(midFile)

    for i, track in enumerate(rMid.tracks):
        for ev in track:
            if ev.type == "note_on":
                if ev.velocity > rtn:
                    rtn = ev.velocity

    return rtn

#**************************************
def NormalizeVelocity(velo, mxVelo):
    rtn = 0

# Set compression ratio eg: 2:1, 3:1, 4:1, 6:1, 8:1 etc
    compress = 8

# Pick up bumped or hidden notes
    if velo < 16:
        velo = 16

# Calc gain
    target = 95
    net = mxVelo / compress
    gain = target - net

# Normalize
    x = (velo / compress) + gain
    y = round(x)
    rtn = int(y)

    return rtn

#**************************************
# Run process
trckNmbr = 0

mxVelo = GetMaxVelocity(midFile)

# Open Midi file 
rMid = MidiFile(midFile)

for i, track in enumerate(rMid.tracks):
    if i == trckNmbr:
        for ev in track:
            if ev.type == "note_on":
                newVelocity = NormalizeVelocity(ev.velocity, mxVelo)
                print('New Velocity:',newVelocity)