class AudioApp(App):
def build(self):
root = GridLayout(padding=20, spacing=10, cols=4)
self.stream = AudioStream(channels=2, buffersize=1024)
self.gens = {}
for x in xrange(20):
sample = AudioSample(partial(self.audio_callback, x))
self.stream.add_sample(sample)
btn = Button(text='Sample %d' % x)
btn.bind(state=partial(self.update_state, x))
slider = Slider(min=110, max=880, value=440)
slider.bind(value=partial(self.update_freq, x))
root.add_widget(btn)
root.add_widget(slider)
# generators
gen_left = sine_wave()
gen_right = sine_wave(frequency=220.0)
self.gens[x] = [sample, gen_left, gen_right, None, None]
return root
def update_freq(self, x, slider, value):
self.gens[x][3] = value
self.gens[x][4] = value / 2
def update_state(self, x, instance, value):
if value == 'down':
self.gens[x][0].play()
elif value == 'normal':
self.gens[x][0].stop()
def audio_callback(self, x, sample, index, bufsize):
buf = []
f = (2 ** 16) / pi
lvl = lvr = None
g = self.gens[x]
gen_left, gen_right, next_freq_left, next_freq_right = g[1:]
while len(buf) < bufsize / 2:
vl = int(gen_left.next() * f)
vr = int(gen_right.next() * f)
if next_freq_left and lvl == 0 and vl > 0:
g[1] = gen_left = sine_wave(frequency=next_freq_left)
g[3] = next_freq_left = None
vl = int(gen_left.next() * f)
if next_freq_right and lvr == 0 and vr > 0:
g[2] = gen_right = sine_wave(frequency=next_freq_right)
g[4] = next_freq_right = None
vr = int(gen_right.next() * f)
lvl = vl
lvr = vr
buf.append(vl)
buf.append(vr)
return pack('h' * len(buf), *buf)
class AudioApp(App):
def build(self):
root = GridLayout(padding=20, spacing=10, cols=4)
self.stream = AudioStream(channels=2, buffersize=1024)
self.gens = {}
for x in xrange(20):
sample = AudioSample(partial(self.audio_callback, x))
self.stream.add_sample(sample)
btn = Button(text='Sample %d' % x)
btn.bind(state=partial(self.update_state, x))
slider = Slider(min=110, max=880, value=440)
slider.bind(value=partial(self.update_freq, x))
root.add_widget(btn)
root.add_widget(slider)
# generators
gen_left = sine_wave()
gen_right = sine_wave(frequency=220.0)
self.gens[x] = [sample, gen_left, gen_right, None, None]
return root
def update_freq(self, x, slider, value):
self.gens[x][3] = value
self.gens[x][4] = value / 2
def update_state(self, x, instance, value):
if value == 'down':
self.gens[x][0].play()
elif value == 'normal':
self.gens[x][0].stop()
def audio_callback(self, x, sample, index, bufsize):
buf = []
f = (2**16) / pi
lvl = lvr = None
g = self.gens[x]
gen_left, gen_right, next_freq_left, next_freq_right = g[1:]
while len(buf) < bufsize / 2:
vl = int(gen_left.next() * f)
vr = int(gen_right.next() * f)
if next_freq_left and lvl == 0 and vl > 0:
g[1] = gen_left = sine_wave(frequency=next_freq_left)
g[3] = next_freq_left = None
vl = int(gen_left.next() * f)
if next_freq_right and lvr == 0 and vr > 0:
g[2] = gen_right = sine_wave(frequency=next_freq_right)
g[4] = next_freq_right = None
vr = int(gen_right.next() * f)
lvl = vl
lvr = vr
buf.append(vl)
buf.append(vr)
return pack('h' * len(buf), *buf)
def build(self):
root = GridLayout(padding=20, spacing=10, cols=4)
self.stream = AudioStream(channels=2, buffersize=1024)
self.gens = {}
for x in xrange(20):
sample = AudioSample(partial(self.audio_callback, x))
self.stream.add_sample(sample)
btn = Button(text='Sample %d' % x)
btn.bind(state=partial(self.update_state, x))
slider = Slider(min=110, max=880, value=440)
slider.bind(value=partial(self.update_freq, x))
root.add_widget(btn)
root.add_widget(slider)
# generators
gen_left = sine_wave()
gen_right = sine_wave(frequency=220.0)
self.gens[x] = [sample, gen_left, gen_right, None, None]
return root
def build(self):
root = GridLayout(padding=20, spacing=10, cols=4)
self.stream = AudioStream(channels=2, buffersize=1024)
self.gens = {}
for x in xrange(20):
sample = AudioSample(partial(self.audio_callback, x))
self.stream.add_sample(sample)
btn = Button(text='Sample %d' % x)
btn.bind(state=partial(self.update_state, x))
slider = Slider(min=110, max=880, value=440)
slider.bind(value=partial(self.update_freq, x))
root.add_widget(btn)
root.add_widget(slider)
# generators
gen_left = sine_wave()
gen_right = sine_wave(frequency=220.0)
self.gens[x] = [sample, gen_left, gen_right, None, None]
return root
