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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 waveform view from Measure
from mouth import *
class WaveformMouth(Mouth):
def __init__(self, audioSource, fill_color):
Mouth.__init__(self, audioSource, fill_color)
self.buffer_size = 100
self.peaks = []
self.stop = False
self.y_mag_bias_multiplier = 1
self.y_mag = 0.7
def do_draw(self, context):
rect = self.get_allocation()
self.param1 = rect.height / 65536.0
self.param2 = rect.height / 2.0
# background
context.set_source_rgba(*self.fill_color.get_rgba())
context.paint()
# Draw the waveform
context.set_line_width(min(rect.height / 10.0, 10))
count = 0
buflen = float(len(self.main_buffers))
for value in self.main_buffers:
peak = float(self.param1 * value * self.y_mag) +\
self.y_mag_bias_multiplier * self.param2
if peak >= rect.height:
peak = rect.height
if peak <= 0:
peak = 0
x = count / buflen * rect.width
context.line_to(x, rect.height - peak)
count += 1
context.set_source_rgb(0, 0, 0)
context.stroke()
return True
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