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PyAudioのVolumeをコントロール
from numpy import frombuffer, dtype, asarray, iinfo
def byteToPCM(data, sample_width):
d_type = 'float'
if sample_width == 2:
d_type = 'short'
return frombuffer(data, dtype=d_type)
def pcmToFloat(sig, type='float32'):
sig = asarray(sig)
if sig.dtype.kind != 'i':
raise TypeError('signal must be integer')
type = dtype(type)
if type.kind != 'f':
raise TypeError('type must be float')
return sig.astype(type) / type.type(-iinfo(sig.dtype).min)
def floatToPCM(sig, dtype='int16'):
return (sig * iinfo(dtype).max).astype(dtype)
def dd(self):
wf = self.wf
frate = wf.getframerate()
sampw = wf.getsampwidth()
nchan = wf.getnchannels()
def callback(in_data, frame_count, time_info, status):
data = wf.readframes(frame_count)
if type(data) == type(''):
data = str.encode(data)
# if len(data) < frame_count * sampw * nchan:
# if self.loop_box.isChecked():
# wf.rewind()
# data = b''.join([data,
# wf.readframes(frame_count - int(len(data) / (sampw * nchan)))])
# self.chain.reset()
# elif len(data) == 0:
# return data, pyaudio.paComplete
filtered = self.chain.filter(pcmToFloat(byteToPCM(data, sampw)))
# self.plotwin.updateSpectrum(np.fft.rfft(filtered))
return bytes(floatToPCM(filtered)), pyaudio.paContinue
chunk_size = np.int(frate / self.plotwin.refresh_rate)
self.stream = pya.open(format=pya.get_format_from_width(wf.getsampwidth()),
channels=wf.getnchannels(),
rate=frate,
frames_per_buffer=chunk_size,
output=True,
stream_callback=callback)
self.chain.reset()
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