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PulseAudioSpectrogram.py
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PulseAudioSpectrogram.py
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# PulseAudioSpectrogram.py
# vi: et sw=2 fileencoding=utf8
#
# Copyright 2012 Harry Karvonen
#
# This file is part of PulseAudioSpectrogram.
#
# PulseAudioSpectrogram 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.
#
# PulseAudioSpectrogram 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 PulseAudioSpectrogram. If not, see <http://www.gnu.org/licenses/>.
import math
import cairo
from gi.repository import Gtk, Gdk, GObject
class SpectrogramWidget(Gtk.DrawingArea):
def __init__(self):
Gtk.DrawingArea.__init__(self)
self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 1024, 512)
self.red_dB_offset = 0
self.red_dB_max = 18
self.press_x = -1
self.press_y = -1
self.connect("button-press-event", self.on_mouse_press_event)
self.add_events(Gdk.EventMask.BUTTON_PRESS_MASK)
self.set_size_request(1024 + 20, 512 + 20)
self.connect("draw", self.on_draw)
pass # def __init__
def setDBMax(self, value):
self.red_dB_max = value
pass # def setDBMax
def setDBOffset(self, value):
self.red_dB_offset = value
pass # def setDBOffset
def on_mouse_press_event(self, widget, event):
self.press_x, self.press_y = event.get_coords()
self.get_window().invalidate_rect(self.get_allocation(), True)
pass # def on_mouse_press_event
def timeout(self, fft_data):
my_cr = cairo.Context(self.surface)
my_cr.set_source_surface(self.surface, -1, 0)
my_cr.rectangle(0, 0, 1024, 512)
my_cr.fill()
self.draw_fft(my_cr, fft_data)
self.get_window().invalidate_rect(self.get_allocation(), True)
self.get_window().process_updates(True)
pass # def timeout
def on_draw(self, widget, cr):
w = self.get_allocated_width()
h = self.get_allocated_height()
cr.set_source_surface(self.surface, 0, 0)
cr.rectangle(0, 0, w, h)
cr.fill()
self.draw_ruler(cr)
pass # def on_draw
def draw_fft(self, cr, fft):
for i in range(0, len(fft)):
audio_dB = -80
if fft[i] > 0:
audio_dB = 10 * math.log10(fft[i])
audio_dB += self.red_dB_offset
# Color
cr.set_source_rgb(audio_dB / self.red_dB_max, 0, 0)
# Dot
cr.rectangle(1024 - 1, 512 - (i+1) * 512 / len(fft), 1, 512/len(fft))
cr.fill()
pass # for i in range(0, len(fft))
pass # def draw_fft
def draw_ruler(self, cr):
cr.set_source_rgb(1, 1, 1)
cr.rectangle(1024, 0, 20, 532)
cr.fill()
cr.rectangle(0, 512, 1044, 20)
cr.fill()
cr.set_source_rgb(0, 0, 0)
cr.move_to(1024, 0)
cr.line_to(1024, 512)
cr.line_to(0, 512)
cr.stroke()
cr.move_to(0, 531)
cr.line_to(1043, 531)
cr.line_to(1043, 0)
cr.stroke()
if -1 < self.press_y < 512 and -1 < self.press_x < 1024:
fix_y = -2
fix_x = -2
Hz_str = "%d Hz" % int(float(512 - int(self.press_y)) * 22050.0 / 512.0)
s_str = "%.2f s" % ((1023 - self.press_x) * 0.025)
if self.press_y > 256:
fix_y = cr.text_extents(Hz_str)[2] + 4
if self.press_x > 512:
fix_x = cr.text_extents(s_str)[2] + 4
cr.move_to(1030, self.press_y - fix_y)
cr.rotate(3.14 / 2)
cr.show_text(Hz_str)
cr.rotate(-3.14 / 2)
cr.move_to(1024, self.press_y)
cr.line_to(1044, self.press_y)
cr.stroke()
cr.move_to(self.press_x - fix_x, 526)
cr.show_text(s_str)
cr.move_to(self.press_x, 512)
cr.line_to(self.press_x, 532)
cr.stroke()
cr.set_source_rgba(1, 1, 1, 0.2)
cr.move_to(self.press_x, 0)
cr.line_to(self.press_x, 511)
cr.move_to(0, self.press_y)
cr.line_to(self.press_x - 1, self.press_y)
cr.move_to(self.press_x + 1, self.press_y)
cr.line_to(1023, self.press_y)
cr.stroke()
pass # for i in range(0, 512)
pass
pass # class SpectrogramWidget
import spectrogram
#from FFTWidget import FFTWidget
class PulseSpectrogram(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="PulseAudioSpectrogram")
spectrogram.connect()
self.running = False
self.spec = SpectrogramWidget()
#self.spec = FFTWidget()
self.sourceLabel = Gtk.Label()
self.sourceLabel.set_label(spectrogram.source_name())
self.button = Gtk.Button(label="Start")
self.button.connect("clicked", self.on_button_clicked)
self.scaleMax = Gtk.HScale()
self.scaleMax.set_value_pos(Gtk.PositionType.LEFT)
self.scaleMax.set_digits(0)
self.scaleMax.set_size_request(200, 20)
self.scaleMax.set_adjustment(Gtk.Adjustment(20, 1, 100, 1, 10, 0))
self.scaleMax.set_increments(0.5, 5)
self.scaleMax.connect(
"value-changed",
self.on_scale_value_changed,
self.spec.setDBMax
)
self.scaleOffset = Gtk.HScale()
self.scaleOffset.set_value_pos(Gtk.PositionType.LEFT)
self.scaleOffset.set_digits(0)
self.scaleOffset.set_size_request(200, 20)
self.scaleOffset.set_adjustment(Gtk.Adjustment(0, -80, 80, 1, 10, 1))
self.scaleOffset.set_increments(0.5, 5)
self.scaleOffset.connect(
"value-changed",
self.on_scale_value_changed,
self.spec.setDBOffset
)
box = Gtk.Box(spacing=6)
box.add(Gtk.Label("Offset dB"))
box.add(self.scaleOffset)
box.add(Gtk.Label("Max dB"))
box.add(self.scaleMax)
box.add(self.button)
box.add(self.sourceLabel)
vbox = Gtk.VBox(spacing=6)
vbox.pack_start(self.spec, True, True, 0)
vbox.pack_start(box, False, False, 0)
self.add(vbox)
pass # def __init__
def on_scale_value_changed(self, widget, setScale):
setScale(widget.get_value())
def on_button_clicked(self, widget):
if self.running:
self.button.set_label("Start")
self.running = False
else:
self.button.set_label("Stop")
GObject.timeout_add(25, self.on_timeout)
self.running = True
pass # def on_button_clicked
def on_timeout(self):
self.spec.timeout(spectrogram.read())
return self.running
pass # class PulseSpectrogram
if __name__ == "__main__":
win = PulseSpectrogram()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()