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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 expose(self, widget, event):
+ """This function is the "expose" event handler and does all the drawing."""
+
+ bounds = self.get_allocation()
+ self.param1 = bounds.height/65536.0
+ self.param2 = bounds.height/2.0
+
+ #Create context, disable antialiasing
+ self.context = widget.window.cairo_create()
+ self.context.set_antialias(cairo.ANTIALIAS_NONE)
+
+ #set a clip region for the expose event. This reduces redrawing work (and time)
+ self.context.rectangle(event.area.x, event.area.y,event.area.width, event.area.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))
+ 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 >= bounds.height:
+ peak = bounds.height
+ if peak <= 0:
+ peak = 0
+
+ x = count / buflen * bounds.width
+ self.context.line_to(x,bounds.height - peak)
+
+ count += 1
+ self.context.set_source_rgb(0,0,0)
+ self.context.stroke()
+
+ return True