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import rtaudio as rt
from math import cos
import struct
class audio_generator:
def __init__(self):
self.idx = -1
self.freq = 440.
def __call__(self):
self.idx += 1
if self.idx%48000 == 0:
self.freq *= 2**(1/12.)
return 0.5*cos(2.*3.1416*self.freq*self.idx/48000.)
class callback:
def __init__(self, gen):
self.gen = gen
self.i = 0
def __call__(self,playback, capture):
[struct.pack_into("f", playback, 4*o, self.gen()) for o in xrange(256)]
self.i = self.i + 256
if self.i > 48000*10:
print '.'
return 1
dac = rt.RtAudio()
n = dac.getDeviceCount()
print 'Number of devices available: ', n
for i in range(n):
try:
print dac.getDeviceInfo(i)
except rt.RtError as e:
print e
print 'Default output device: ', dac.getDefaultOutputDevice()
print 'Default input device: ', dac.getDefaultInputDevice()
print 'is stream open: ', dac.isStreamOpen()
print 'is stream running: ', dac.isStreamRunning()
oParams = {'deviceId': 1, 'nChannels': 1, 'firstChannel': 0}
iParams = {'deviceId': 1, 'nChannels': 1, 'firstChannel': 0}
try:
dac.openStream(oParams,oParams,48000,256,callback(audio_generator()) )
except rt.RtError as e:
print e
else:
dac.startStream()
import time
print 'latency: ', dac.getStreamLatency()
while (dac.isStreamRunning()):
time.sleep(0.1)
print dac.getStreamTime()
dac.stopStream()
dac.abortStream()
dac.closeStream()
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