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# Copyright 2009 Simon Schampijer
#
# 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; either version 2 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 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 gtk
import logging
from gettext import gettext as _
from sugar.activity import activity
from sugar.graphics.toolbarbox import ToolbarBox
from sugar.activity.widgets import ActivityToolbarButton
from sugar.activity.widgets import StopButton
from draw_piano import PianoKeyboard
import gst
import math
class SimplePianoActivity(activity.Activity):
"""SimplePianoActivity class as specified in activity.info"""
def __init__(self, handle):
"""Set up the HelloWorld activity."""
activity.Activity.__init__(self, handle)
# we do not have collaboration features
# make the share option insensitive
self.max_participants = 1
# toolbar with the new toolbar redesign
toolbar_box = ToolbarBox()
activity_button = ActivityToolbarButton(self)
toolbar_box.toolbar.insert(activity_button, 0)
separator = gtk.SeparatorToolItem()
separator.props.draw = False
separator.set_expand(True)
toolbar_box.toolbar.insert(separator, -1)
stop_button = StopButton(self)
toolbar_box.toolbar.insert(stop_button, -1)
stop_button.show()
self.set_toolbar_box(toolbar_box)
toolbar_box.show_all()
self.tone_generator = GstToneGenerator()
self.keyboard_letters = ['Q2W3ER5T6Y7UI', 'ZSXDCVGBHNJM', ',']
notes = ['DO', 'DO#', 'RE', 'RE#', 'MI', 'FA', 'FA#', 'SOL',
'SOL#', 'LA', 'LA#', 'SI']
labels_tamtam = [notes, notes, ['DO']]
piano = PianoKeyboard(octaves=2, add_c=True,
labels=self.keyboard_letters)
piano.connect('key_pressed', self.__key_pressed_cb)
piano.connect('key_released', self.__key_released_cb)
piano.show()
self.set_canvas(piano)
def __key_pressed_cb(self, widget, octave_clicked, key_clicked, letter):
logging.debug('Pressed Octave: %d Key: %d Letter: %s' %
(octave_clicked, key_clicked, letter))
if key_clicked >= 9:
key = key_clicked - 9
octave = octave_clicked + 1
else:
key = key_clicked + 3
octave = octave_clicked
freq = 440 * math.pow(2.0, octave + (key - 12.0) / 12.0)
logging.debug('Vales Octave: %d Key: %d Freq: %s' % (octave, key,
freq))
self.tone_generator.set_values(freq, 1)
self.tone_generator.start()
def __key_released_cb(self, widget, octave_clicked, key_clicked, letter):
self.tone_generator.stop()
class GstToneGenerator(object):
"""Gstreamer based tone generator.
from https://github.com/iamFIREcracker/py-tone-generator/
"""
def __init__(self):
str_pipe = '''audiotestsrc name=source !autoaudiosink'''
self.pipeline = gst.parse_launch(str_pipe)
self.source = self.pipeline.get_by_name('source')
def start(self):
self.pipeline.set_state(gst.STATE_PLAYING)
def stop(self):
self.pipeline.set_state(gst.STATE_NULL)
def set_values(self, freq, volume):
"""Change the frequency and volume values of the sound source.
Keywords:
freq frequency value between 0 and 20k.
volume volume value between 0 and 1.
"""
self.source.set_property('freq', max(0, min(freq, 20000)))
self.source.set_property('volume', max(0, min(volume, 1)))
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