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# Speak.activity
# A simple front end to the espeak text-to-speech engine on the XO laptop
# http://wiki.laptop.org/go/Speak
#
# Copyright (C) 2008 Joshua Minor
# This file is part of Speak.activity
#
# Parts of Speak.activity are based on code from Measure.activity
# Copyright (C) 2007 Arjun Sarwal - arjun@laptop.org
#
# Speak.activity 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.
#
# Speak.activity 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 Speak.activity. If not, see <http://www.gnu.org/licenses/>.
# This code is a stripped down version of the fft view from Measure
from mouth import *
# Newer OLPC builds (and Fedora) have numpy instead of numeric:
try:
from numpy.oldnumeric import ceil
from numpy.fft import *
except:
from Numeric import ceil
from FFT import *
class FFTMouth(Mouth):
def __init__(self, audioSource, fill_color):
Mouth.__init__(self, audioSource, fill_color)
self.peaks = []
self.y_mag = 1.7
self.freq_range = 70
self.draw_interval = 1
self.num_of_points = 105
self.stop = False
#constant to multiply with self.param2 while scaling values
self.y_mag_bias_multiplier = 1
self.fftx = []
self.scaleX = "10"
self.scaleY = "10"
def processBuffer(self, bounds):
self.param1 = bounds.height / 65536.0
self.param2 = bounds.height / 2.0
if(self.stop == False):
Fs = 48000
nfft = 65536
self.newest_buffer = self.newest_buffer[0:256]
self.fftx = fft(self.newest_buffer, 256, -1)
self.fftx = self.fftx[0:self.freq_range * 2]
self.draw_interval = bounds.width / (self.freq_range * 2.)
NumUniquePts = ceil((nfft + 1) / 2)
self.buffers = abs(self.fftx) * 0.02
self.y_mag_bias_multiplier = 0.1
self.scaleX = "hz"
self.scaleY = ""
if(len(self.buffers) == 0):
return False
# Scaling the values
val = []
for i in self.buffers:
temp_val_float = float(self.param1 * i * self.y_mag) +\
self.y_mag_bias_multiplier * self.param2
if(temp_val_float >= bounds.height):
temp_val_float = bounds.height - 25
if(temp_val_float <= 0):
temp_val_float = 25
val.append(temp_val_float)
self.peaks = val
def do_draw(self, context):
"""This function is the "expose" event
handler and does all the drawing."""
bounds = self.get_allocation()
self.processBuffer(bounds)
#Create context, disable antialiasing
self.context = context
#self.context.set_antialias(cairo.ANTIALIAS_NONE)
#set a clip region for the expose event.
#This reduces redrawing work (and time)
self.context.rectangle(bounds.x,
bounds.y,
bounds.width,
bounds.height)
self.context.clip()
# background
self.context.set_source_rgba(*self.fill_color.get_rgba())
self.context.rectangle(0, 0, bounds.width, bounds.height)
self.context.fill()
# Draw the waveform
self.context.set_line_width(min(bounds.height / 10.0, 10))
self.context.set_source_rgb(0, 0, 0)
count = 0
for peak in self.peaks:
self.context.line_to(bounds.width / 2 + count,
bounds.height / 2 - peak)
count += self.draw_interval
self.context.stroke()
count = 0
for peak in self.peaks:
self.context.line_to(bounds.width / 2 - count,
bounds.height / 2 - peak)
count += self.draw_interval
self.context.stroke()
return True
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