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# This file is part of jack_mixer
#
# Copyright (C) 2006 Nedko Arnaudov <nedko@arnaudov.name>
#
# 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; version 2 of the License
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
import math
import jack_mixer_c
class Mark:
'''Encapsulates scale linear function edge and coefficients for scale = a * dB + b formula'''
def __init__(self, db, scale):
self.db = db
self.scale = scale
self.text = "%.0f" % math.fabs(db)
class Base:
'''Scale abstraction, various scale implementation derive from this class'''
def __init__(self, scale_id, description):
self.marks = []
self.scale_id = scale_id
self.description = description
self.scale = jack_mixer_c.Scale()
def add_threshold(self, db, scale, is_mark):
self.scale.add_threshold(db, scale)
if is_mark:
self.marks.append(Mark(db, scale))
def calculate_coefficients(self):
self.scale.calculate_coefficients()
def db_to_scale(self, db):
'''Convert dBFS value to number in range 0.0-1.0 used in GUI'''
#print "db_to_scale(%f)" % db
return self.scale.db_to_scale(db)
def scale_to_db(self, scale):
'''Convert number in range 0.0-1.0 used in GUI to dBFS value'''
return self.scale.scale_to_db(scale)
def add_mark(self, db):
self.marks.append(Mark(db, -1.0))
def get_marks(self):
return self.marks
def scale_marks(self):
for i in self.marks:
if i.scale == -1.0:
i.scale = self.db_to_scale(i.db)
# IEC 60268-18 Peak programme level meters - Digital audio peak level meter
# Adapted from meterpridge, may be wrong, I'm not buying standards, event if they cost $45
# If someone has the standart, please eighter share it with me or fix the code.
class IEC268(Base):
'''IEC 60268-18 Peak programme level meters - Digital audio peak level meter'''
def __init__(self):
Base.__init__(self, "iec_268",
"IEC 60268-18 Peak programme level meters - Digital audio peak level meter")
self.add_threshold(-70.0, 0.0, False)
self.add_threshold(-60.0, 0.05, True)
self.add_threshold(-50.0, 0.075, True)
self.add_threshold(-40.0, 0.15, True)
self.add_mark(-35.0)
self.add_threshold(-30.0, 0.3, True)
self.add_mark(-25.0)
self.add_threshold(-20.0, 0.5, True)
self.add_mark(-15.0)
self.add_mark(-10.0)
self.add_mark(-5.0)
self.add_threshold(0.0, 1.0, True)
self.calculate_coefficients()
self.scale_marks()
class IEC268Minimalistic(Base):
'''IEC 60268-18 Peak programme level meters - Digital audio peak level meter,
fewer marks'''
def __init__(self):
Base.__init__(self, 'iec_268_minimalistic',
'IEC 60268-18 Peak programme level meters - Digital audio peak level meter, fewer marks')
self.add_threshold(-70.0, 0.0, False)
self.add_threshold(-60.0, 0.05, True)
self.add_threshold(-50.0, 0.075, False)
self.add_threshold(-40.0, 0.15, True)
self.add_threshold(-30.0, 0.3, True)
self.add_threshold(-20.0, 0.5, True)
self.add_mark(-10.0)
self.add_threshold(0.0, 1.0, True)
self.calculate_coefficients()
self.scale_marks()
class Linear70dB(Base):
'''Linear scale with range from -70 to 0 dBFS'''
def __init__(self):
Base.__init__(self, "linear_70dB", "Linear scale with range from -70 to 0 dBFS")
self.add_threshold(-70.0, 0.0, False)
self.add_mark(-60.0)
self.add_mark(-50.0)
self.add_mark(-40.0)
self.add_mark(-35.0)
self.add_mark(-30.0)
self.add_mark(-25.0)
self.add_mark(-20.0)
self.add_mark(-15.0)
self.add_mark(-10.0)
self.add_mark(-5.0)
self.add_threshold(0.0, 1.0, True)
self.calculate_coefficients()
self.scale_marks()
class Linear30dB(Base):
'''Linear scale with range from -30 to +30 dBFS'''
def __init__(self):
Base.__init__(self, "linear_30dB", "Linear scale with range from -30 to +30 dBFS")
self.add_threshold(-30.0, 0.0, False)
self.add_threshold(+30.0, 1.0, True)
self.calculate_coefficients()
self.scale_marks()
def scale_test1(scale):
for i in range(-97 * 2, 1, 1):
db = float(i)/2.0
print "%5.1f dB maps to %f" % (db, scale.db_to_scale(db))
def scale_test2(scale):
for i in range(101):
s = float(i)/100.0
print "%.2f maps to %.1f dB" % (s, scale.scale_to_db(s))
def print_db_to_scale(db):
print "%-.1f dB maps to %f" % (db, scale.db_to_scale(db))
def scale_test3(scale):
print_db_to_scale(+77.0)
print_db_to_scale(+7.0)
print_db_to_scale(0.0)
print_db_to_scale(-107.0)
#scale = linear_30dB()
#scale_test2(scale)
#scale_test3(scale)
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