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58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
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# midiM.py
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"""
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This module is an integeral part of the program
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MMA - Musical Midi Accompaniment.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Bob van der Poel <bvdp@xplornet.com>
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This module contains the MIDI number (un)packing routines.
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These are necessary to create the MSB/LSB stuff that
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MIDI expects.
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"""
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def intToWord(x):
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""" Convert INT to a 2 byte MSB LSB value. """
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return chr(x>>8 & 0xff) + chr(x & 0xff)
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def intTo3Byte(x):
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""" Convert INT to a 3 byte MSB...LSB value. """
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return intToLong(x)[1:]
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def intToLong(x):
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""" Convert INT to a 4 byte MSB...LSB value. """
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return intToWord(x>>16) + intToWord(x)
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def intToVarNumber(x):
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""" Convert INT to a variable length MIDI value. """
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lst = chr(x & 0x7f)
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while 1:
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x = x >> 7
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if x:
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lst = chr((x & 0x7f) | 0x80) + lst
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else:
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return lst
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