# -*- coding: utf-8 -*-
#
# Copyright (c) 2013 Paul Brossier <piem@piem.org>
# This file is part of TimeSide.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Authors:
# Paul Brossier <piem@piem.org>
# Thomas Fillon <thomas@parisson.com>
from __future__ import absolute_import
from timeside.core import implements, interfacedoc
from timeside.core.analyzer import Analyzer
from timeside.core.api import IAnalyzer
from timeside.core.preprocessors import downmix_to_mono, frames_adapter
from aubio import filterbank, pvoc
[docs]class AubioMelEnergy(Analyzer):
"""Aubio Mel Energy analyzer"""
implements(IAnalyzer)
def __init__(self):
super(AubioMelEnergy, self).__init__()
self.input_blocksize = 1024
self.input_stepsize = self.input_blocksize // 4
# Aubio Melenergy Initialisation
self.n_filters = 40
self.n_coeffs = 13
self.pvoc = pvoc(self.input_blocksize, self.input_stepsize)
self.melenergy = filterbank(self.n_filters, self.input_blocksize)
self.block_read = 0
self.melenergy_results = []
[docs] @interfacedoc
def setup(self, channels=None, samplerate=None,
blocksize=None, totalframes=None):
super(AubioMelEnergy, self).setup(channels, samplerate,
blocksize, totalframes)
self.melenergy.set_mel_coeffs_slaney(samplerate)
[docs] @staticmethod
@interfacedoc
def id():
return "aubio_melenergy"
[docs] @staticmethod
@interfacedoc
def name():
return "Mel Energy (aubio)"
[docs] @staticmethod
@interfacedoc
def version():
return "0.4.6"
[docs] @staticmethod
@interfacedoc
def unit():
return ""
[docs] @downmix_to_mono
@frames_adapter
def process(self, frames, eod=False):
# WARNING : All Aubio analyzer process functions manages frames reconstruction by themself
# from small stepsize input blocksize
# i.e. Aubio process functions should receive non overlapping input blocksize
# of length stepsize.
# This is achieve through @frames_adapter that handles Aubio Analyzer specifically (blocksize=stepsize).
fftgrain = self.pvoc(frames)
self.melenergy_results.append(self.melenergy(fftgrain))
self.block_read += 1
return frames, eod
[docs] def post_process(self):
melenergy = self.new_result(data_mode='value', time_mode='framewise')
melenergy.parameters = dict(n_filters=self.n_filters,
n_coeffs=self.n_coeffs)
melenergy.data_object.value = self.melenergy_results
self.add_result(melenergy)