/usr/lib/python2.7/dist-packages/pyolib/analysis.py is in python-pyo 0.7-2.1.
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Tools to analyze audio signals.
These objects are designed to retrieve specific informations
from an audio stream. Analysis are sent at audio rate, user
can use them for controlling parameters of others objects.
"""
"""
Copyright 2010 Olivier Belanger
This file is part of pyo, a python module to help digital signal
processing script creation.
pyo 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 3 of the License, or
(at your option) any later version.
pyo 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 pyo. If not, see <http://www.gnu.org/licenses/>.
"""
from _core import *
from _maps import *
class Follower(PyoObject):
"""
Envelope follower.
Output signal is the continuous mean amplitude of an input signal.
:Parent: :py:class:`PyoObject`
:Args:
input : PyoObject
Input signal to process.
freq : float or PyoObject, optional
Cutoff frequency of the filter in hertz. Default to 20.
.. note::
The out() method is bypassed. Follower's signal can not be sent to
audio outs.
>>> s = Server().boot()
>>> s.start()
>>> sf = SfPlayer(SNDS_PATH + "/transparent.aif", loop=True, mul=.4).out()
>>> fol = Follower(sf, freq=30)
>>> n = Noise(mul=fol).out(1)
"""
def __init__(self, input, freq=20, mul=1, add=0):
PyoObject.__init__(self, mul, add)
self._input = input
self._freq = freq
self._in_fader = InputFader(input)
in_fader, freq, mul, add, lmax = convertArgsToLists(self._in_fader, freq, mul, add)
self._base_objs = [Follower_base(wrap(in_fader,i), wrap(freq,i), wrap(mul,i), wrap(add,i)) for i in range(lmax)]
def setInput(self, x, fadetime=0.05):
"""
Replace the `input` attribute.
:Args:
x : PyoObject
New signal to process.
fadetime : float, optional
Crossfade time between old and new input. Default to 0.05.
"""
self._input = x
self._in_fader.setInput(x, fadetime)
def setFreq(self, x):
"""
Replace the `freq` attribute.
:Args:
x : float or PyoObject
New `freq` attribute.
"""
self._freq = x
x, lmax = convertArgsToLists(x)
[obj.setFreq(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def out(self, chnl=0, inc=1, dur=0, delay=0):
return self.play(dur, delay)
def ctrl(self, map_list=None, title=None, wxnoserver=False):
self._map_list = [SLMap(1., 500., 'log', 'freq', self._freq)]
PyoObject.ctrl(self, map_list, title, wxnoserver)
@property
def input(self):
"""PyoObject. Input signal to process."""
return self._input
@input.setter
def input(self, x): self.setInput(x)
@property
def freq(self):
"""float or PyoObject. Cutoff frequency of the filter."""
return self._freq
@freq.setter
def freq(self, x): self.setFreq(x)
class Follower2(PyoObject):
"""
Envelope follower with different attack and release times.
Output signal is the continuous mean amplitude of an input signal.
:Parent: :py:class:`PyoObject`
:Args:
input : PyoObject
Input signal to process.
risetime : float or PyoObject, optional
Time to reach upward value in seconds. Default to 0.01.
falltime : float or PyoObject, optional
Time to reach downward value in seconds. Default to 0.1.
.. note::
The out() method is bypassed. Follower's signal can not be sent to
audio outs.
>>> s = Server().boot()
>>> s.start()
>>> sf = SfPlayer(SNDS_PATH + "/transparent.aif", loop=True, mul=.4).out()
>>> fol2 = Follower2(sf, risetime=0.002, falltime=.1, mul=.5)
>>> n = Noise(fol2).out(1)
"""
def __init__(self, input, risetime=0.01, falltime=0.1, mul=1, add=0):
PyoObject.__init__(self, mul, add)
self._input = input
self._risetime = risetime
self._falltime = falltime
self._in_fader = InputFader(input)
in_fader, risetime, falltime, mul, add, lmax = convertArgsToLists(self._in_fader, risetime, falltime, mul, add)
self._base_objs = [Follower2_base(wrap(in_fader,i), wrap(risetime,i), wrap(falltime, i), wrap(mul,i), wrap(add,i)) for i in range(lmax)]
def setInput(self, x, fadetime=0.05):
"""
Replace the `input` attribute.
:Args:
x : PyoObject
New signal to process.
fadetime : float, optional
Crossfade time between old and new input. Default to 0.05.
"""
self._input = x
self._in_fader.setInput(x, fadetime)
def setRisetime(self, x):
"""
Replace the `risetime` attribute.
:Args:
x : float or PyoObject
New `risetime` attribute.
"""
self._risetime = x
x, lmax = convertArgsToLists(x)
[obj.setRisetime(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def setFalltime(self, x):
"""
Replace the `falltime` attribute.
:Args:
x : float or PyoObject
New `falltime` attribute.
"""
self._falltime = x
x, lmax = convertArgsToLists(x)
[obj.setFalltime(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def out(self, chnl=0, inc=1, dur=0, delay=0):
return self.play(dur, delay)
def ctrl(self, map_list=None, title=None, wxnoserver=False):
self._map_list = [SLMap(0.001, 1., 'log', 'risetime', self._risetime)]
PyoObject.ctrl(self, map_list, title, wxnoserver)
@property
def input(self):
"""PyoObject. Input signal to process."""
return self._input
@input.setter
def input(self, x): self.setInput(x)
@property
def risetime(self):
"""float or PyoObject. Time to reach upward value in seconds."""
return self._risetime
@risetime.setter
def risetime(self, x): self.setRisetime(x)
@property
def falltime(self):
"""float or PyoObject. Time to reach downward value in seconds."""
return self._falltime
@falltime.setter
def falltime(self, x): self.setFalltime(x)
class ZCross(PyoObject):
"""
Zero-crossing counter.
Output signal is the number of zero-crossing occured during each
buffer size, normalized between 0 and 1.
:Parent: :py:class:`PyoObject`
:Args:
input : PyoObject
Input signal to process.
thresh : float, optional
Minimum amplitude difference allowed between adjacent samples
to be included in the zeros count.
.. note::
The out() method is bypassed. ZCross's signal can not be sent to
audio outs.
>>> s = Server().boot()
>>> s.start()
>>> a = SfPlayer(SNDS_PATH + "/transparent.aif", loop=True, mul=.4).out()
>>> b = ZCross(a, thresh=.02)
>>> n = Noise(b).out(1)
"""
def __init__(self, input, thresh=0., mul=1, add=0):
PyoObject.__init__(self, mul, add)
self._input = input
self._thresh = thresh
self._in_fader = InputFader(input)
in_fader, thresh, mul, add, lmax = convertArgsToLists(self._in_fader, thresh, mul, add)
self._base_objs = [ZCross_base(wrap(in_fader,i), wrap(thresh,i), wrap(mul,i), wrap(add,i)) for i in range(lmax)]
def setInput(self, x, fadetime=0.05):
"""
Replace the `input` attribute.
:Args:
x : PyoObject
New signal to process.
fadetime : float, optional
Crossfade time between old and new input. Default to 0.05.
"""
self._input = x
self._in_fader.setInput(x, fadetime)
def setThresh(self, x):
"""
Replace the `thresh` attribute.
:Args:
x : float
New amplitude difference threshold.
"""
self._thresh = x
x, lmax = convertArgsToLists(x)
[obj.setThresh(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def out(self, chnl=0, inc=1, dur=0, delay=0):
return self.play(dur, delay)
def ctrl(self, map_list=None, title=None, wxnoserver=False):
self._map_list = [SLMap(0., 0.5, 'lin', 'thresh', self._thresh)]
PyoObject.ctrl(self, map_list, title, wxnoserver)
@property
def input(self):
"""PyoObject. Input signal to process."""
return self._input
@input.setter
def input(self, x): self.setInput(x)
@property
def thresh(self):
"""float. Amplitude difference threshold."""
return self._thresh
@thresh.setter
def thresh(self, x): self.setThresh(x)
class Yin(PyoObject):
"""
Pitch tracker using the Yin algorithm.
Pitch tracker using the Yin algorithm based on the implementation in C of aubio.
This algorithm was developped by A. de Cheveigne and H. Kawahara and published in
de Cheveigne, A., Kawahara, H. (2002) 'YIN, a fundamental frequency estimator for
speech and music', J. Acoust. Soc. Am. 111, 1917-1930.
The audio output of the object is the estimated frequency, in Hz, of the input sound.
:Parent: :py:class:`PyoObject`
:Args:
input : PyoObject
Input signal to process.
tolerance : float, optional
Parameter for minima selection, between 0 and 1. Defaults to 0.2.
minfreq : float, optional
Minimum estimated frequency in Hz. Frequency below this threshold will
be ignored. Defaults to 40.
maxfreq : float, optional
Maximum estimated frequency in Hz. Frequency above this threshold will
be ignored. Defaults to 1000.
cutoff : float, optional
Cutoff frequency, in Hz, of the lowpass filter applied on the input sound.
Defaults to 1000.
The lowpass filter helps the algorithm to detect the fundamental frequency by filtering
higher harmonics.
winsize : int, optional
Size, in samples, of the analysis window. Must be higher that two period
of the lowest desired frequency.
Available at initialization time only. Defaults to 1024.
>>> s = Server(duplex=1).boot()
>>> s.start()
>>> lfo = Randh(min=100, max=500, freq=3)
>>> src = SineLoop(freq=lfo, feedback=0.1, mul=.3).out()
>>> pit = Yin(src, tolerance=0.2, winsize=1024)
>>> freq = Tone(pit, freq=10)
>>> # fifth above
>>> a = LFO(freq*1.5, type=2, mul=0.2).out(1)
"""
def __init__(self, input, tolerance=0.2, minfreq=40, maxfreq=1000, cutoff=1000, winsize=1024, mul=1, add=0):
PyoObject.__init__(self, mul, add)
self._input = input
self._tolerance = tolerance
self._minfreq = minfreq
self._maxfreq = maxfreq
self._cutoff = cutoff
self._in_fader = InputFader(input)
in_fader, tolerance, minfreq, maxfreq, cutoff, winsize, mul, add, lmax = convertArgsToLists(self._in_fader, tolerance, minfreq, maxfreq, cutoff, winsize, mul, add)
self._base_objs = [Yin_base(wrap(in_fader,i), wrap(tolerance,i), wrap(minfreq,i), wrap(maxfreq,i), wrap(cutoff,i), wrap(winsize,i), wrap(mul,i), wrap(add,i)) for i in range(lmax)]
def setInput(self, x, fadetime=0.05):
"""
Replace the `input` attribute.
:Args:
x : PyoObject
New signal to process.
fadetime : float, optional
Crossfade time between old and new input. Default to 0.05.
"""
self._input = x
self._in_fader.setInput(x, fadetime)
def setTolerance(self, x):
"""
Replace the `tolerance` attribute.
:Args:
x : float
New parameter for minima selection, between 0 and 1.
"""
self._tolerance = x
x, lmax = convertArgsToLists(x)
[obj.setTolerance(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def setMinfreq(self, x):
"""
Replace the `minfreq` attribute.
:Args:
x : float
New minimum frequency detected.
"""
self._minfreq = x
x, lmax = convertArgsToLists(x)
[obj.setMinfreq(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def setMaxfreq(self, x):
"""
Replace the `maxfreq` attribute.
:Args:
x : float
New maximum frequency detected.
"""
self._maxfreq = x
x, lmax = convertArgsToLists(x)
[obj.setMaxfreq(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def setCutoff(self, x):
"""
Replace the `cutoff` attribute.
:Args:
x : float
New input lowpass filter cutoff frequency.
"""
self._cutoff = x
x, lmax = convertArgsToLists(x)
[obj.setCutoff(wrap(x,i)) for i, obj in enumerate(self._base_objs)]
def out(self, chnl=0, inc=1, dur=0, delay=0):
return self.play(dur, delay)
def ctrl(self, map_list=None, title=None, wxnoserver=False):
self._map_list = [SLMap(0, 1, 'lin', 'tolerance', self._tolerance, dataOnly=True),
SLMap(20, 400, 'log', 'minfreq', self._minfreq, dataOnly=True),
SLMap(500, 5000, 'log', 'maxfreq', self._maxfreq, dataOnly=True),
SLMap(200, 15000, 'log', 'cutoff', self._cutoff, dataOnly=True)]
PyoObject.ctrl(self, map_list, title, wxnoserver)
@property
def input(self):
"""PyoObject. Input signal to process."""
return self._input
@input.setter
def input(self, x): self.setInput(x)
@property
def tolerance(self):
"""float. Parameter for minima selection."""
return self._tolerance
@tolerance.setter
def tolerance(self, x): self.setTolerance(x)
@property
def minfreq(self):
"""float. Minimum frequency detected."""
return self._minfreq
@minfreq.setter
def minfreq(self, x): self.setMinfreq(x)
@property
def maxfreq(self):
"""float. Maximum frequency detected."""
return self._maxfreq
@maxfreq.setter
def maxfreq(self, x): self.setMaxfreq(x)
@property
def cutoff(self):
"""float. Input lowpass filter cutoff frequency."""
return self._cutoff
@cutoff.setter
def cutoff(self, x): self.setCutoff(x)
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