#!/usr/pkg/bin/python
"""facilitate spirit communications using set of particular frequencies

   spirit communications powered by 13 simulaneous audio frequencies
   131, 141, 151, 241, 272, 282, 292, 302, 415, 433, 515, 653, 701 Hz
   see www.worlditc.org/k_06_spiricom.htm"""

Copyright = """
    whitenoise.py -- generate frequencies to aid spirit communications
    Copyright (C) 2005  John Comeau <jc@jcomeau.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    """
errormessage = "Not all needed libraries found, upgrade or check path"
try:
 True # not defined in older Python releases
except:
 True, False = 1, 0
try:
 import sys, os, types, re, pwd
 sys.path.append(os.path.join(pwd.getpwuid(os.geteuid())[5], 'lib', 'python'))
 from com.jcomeau import gpl, jclicense
except:
 try:
  sys.stderr.write("%s\n" % errormessage)
 except:
  print errormessage
 raise

# get name this program was called as
self = sys.argv[0].split(os.sep)[-1]
# now get name we gave it when we wrote it
originalself = Copyright.split()[0]

# globals and routines that should be in every program
# (yes, you could import them, but there are problems in that approach too)

def DebugPrint(*whatever):
 pass # defined instead by pytest module, use that for debugging

# other globals, specific to this program
spirit_hz = [131, 141, 151, 241, 272, 282, 292, 302, 415, 433, 515, 653, 701]
# skip drum channel or we'll be missing a frequency
channels =  [0,   1,   2,   3,   4,   5,   6,   7,   8,   10,  11,  12,  13]

import time
from com.jcomeau import arcane
from com.jcomeau.midi import midi, pymidi

def whitenoise(*args):
 """generate frequencies for specified time period:

    131, 141, 151, 241, 272, 282, 292, 302, 415, 433, 515, 653, 701 Hz"""
 try:
  while type(args[0]) is types.ListType or type(args[0]) is types.TupleType:
   args = args[0]
 except:
  args = ()
 if len(args) < 1:
  sys.stderr.write("Usage: %s DURATION(ms) (use 0 for continuous)\n" % self)
  sys.exit(0)
 if DebugPrint():
  midi.DebugPrint = DebugPrint # cascade debugging to other modules
 try:
  duration = float(args[1])
 except:
  sys.stderr.write("No duration or invalid duration specified\n")
  sys.stderr.write("Playing notes forever until key is hit\n")
  duration = 0
 midihandle = pymidi.open("/dev/midi", "wb")
 # piano (default) sound decays too rapidly, try something else...
 midi.SetChannelProgram(midihandle, 0, 'Flute')
 midi.SetChannelProgram(midihandle, 1, 'Flute')
 tones = midi.NoteMapping('all', 'frequency').values()
 # time to face the music
 channel = 0
 for index in range(0, len(spirit_hz)):
  tone = spirit_hz[index]
  channel = channels[index]
  note = arcane.NearestValueIndex(tone, tones)  # index happens to be MIDI note
  midi.SetChannelPitchFrequency(midihandle, channel, note, tone - tones[note])
  pymidi.write(midihandle, (0x90 + channel, note, 64))  # sound tone
 if duration != 0:
  time.sleep(duration / 1000)
 else:
  arcane.pause("Hit <ENTER> to stop...")
  for index in range(0, len(spirit_hz)):
   tone = spirit_hz[index]
   channel = channels[index]
   note = arcane.NearestValueIndex(tone, tones)  # index happens to be MIDI note
   pymidi.write(midihandle, (0x90 + channel, note, 0))  # turn it off
  pymidi.close(midihandle)

if __name__ == '__main__':
 # if this program was imported by another, the above test will fail,
 # and this following code won't be used...
 whitenoise(sys.argv[1:])