From 6e82c5964e31f3cc937911069709af9830071338 Mon Sep 17 00:00:00 2001
From: Aleksey Lim <alsroot@member.fsf.org>
Date: Fri, 25 Dec 2009 15:34:56 +0000
Subject: Use only one directory level for sources

---
(limited to 'fft_mouth.py')

diff --git a/fft_mouth.py b/fft_mouth.py
new file mode 100644
index 0000000..53bcadf
--- /dev/null
+++ b/fft_mouth.py
@@ -0,0 +1,128 @@
+# 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
+
+        self.y_mag_bias_multiplier = 1  #constant to multiply with self.param2 while scaling values
+
+        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 expose(self, widget, event):
+        """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 = 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))
+        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
--
cgit v0.9.1