more minim goodness

examples.py/Library/Minim (Sound)/BandPassFilter/BandPassFilter.py

@@ -0,0 +1,61 @@
+"""
+ * Band Pass Filter
+ * by Damien Di Fede. (Adapted to Python by Jonathan Feinberg)
+ *     
+ * This sketch demonstrates how to use the BandPass effect.
+ * Move the mouse left and right to change the frequency of the pass band.
+ * Move the mouse up and down to change the band width of the pass band.
+"""
+
+from ddf.minim import Minim, AudioPlayer
+from ddf.minim.effects import BandPass
+
+def setup():
+    size(512, 200, P2D)
+
+    global minim, groove, bpf
+
+    minim = Minim(this)
+
+    groove = minim.loadFile("groove.mp3")
+    groove.loop()
+    # make a band pass filter with a center frequency of 440 Hz and a bandwidth of 20 Hz
+    # the third argument is the sample rate of the audio that will be filtered
+    # it is required to correctly compute values used by the filter
+    bpf = BandPass(440, 20, groove.sampleRate())
+    groove.addEffect(bpf)
+
+def draw():
+    background(0)
+    stroke(255)
+    # draw the waveforms
+    # the values returned by left.get() and right.get() will be between -1 and 1,
+    # so we need to scale them up to see the waveform
+    for i in xrange(groove.right.size() - 1):
+        x1 = map(i, 0, groove.bufferSize(), 0, width)
+        x2 = map(i + 1, 0, groove.bufferSize(), 0, width)
+        line(x1, height / 4 - groove.left.get(i) * 50, 
+             x2, height / 4 - groove.left.get(i + 1) * 50)
+        line(x1, 3 * height / 4 - groove.right.get(i) * 50, 
+             x2, 3 * height / 4 - groove.right.get(i + 1) * 50)
+
+    # draw a rectangle to represent the pass band
+    noStroke()
+    fill(255, 0, 0, 60)
+    rect(mouseX - bpf.getBandWidth() / 20, 0, bpf.getBandWidth() / 10, height)
+
+def mouseMoved():
+    # map the mouse position to the range [100, 10000], an arbitrary range of passBand frequencies
+    passBand = map(mouseX, 0, width, 100, 2000)
+    bpf.setFreq(passBand)
+    bandWidth = map(mouseY, 0, height, 50, 500)
+    bpf.setBandWidth(bandWidth)
+    # prints the new values of the coefficients in the console
+    bpf.printCoeff()
+
+def stop():
+    # always close Minim audio classes when you finish with them
+    groove.close()
+    # always stop Minim before exiting
+    minim.stop()
+

examples.py/Library/Minim (Sound)/LoadSample/LoadSample.py

@@ -41,11 +41,11 @@ def setup():
     # always start Minim before you do anything with it
     global minim
     minim = Minim(this)
+    global kick
     # load BD.mp3 from the data folder with a 1024 sample buffer
-    # kick = Minim.loadSample("BD.mp3")
+    kick = minim.loadSample("BD.mp3")
     # load BD.mp3 from the data folder, with a 512 sample buffer
-    global kick
-    kick = minim.loadSample("BD.mp3", 2048)
+    #kick = minim.loadSample("BD.mp3", 2048)
 
 def draw():
     background(0)