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paulstretch_stereo to handle both mono and stereo #2

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paulstretch_stereo to handle both mono and stereo #2

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9 changes: 4 additions & 5 deletions paulstretch_stereo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,8 +21,8 @@ def load_wav(filename):
samplerate=int(wavedata[0])
smp=wavedata[1]*(1.0/32768.0)
smp=smp.transpose()
if len(smp.shape)==1: #convert to stereo
smp=tile(smp,(2,1))
if len(smp.shape)==1: #convert to 2D-array
smp=array([smp])
return (samplerate,smp)
except:
print "Error loading wav: "+filename
Expand Down Expand Up @@ -79,7 +79,7 @@ def paulstretch(samplerate,smp,stretch,windowsize_seconds,outfilename):
# window=0.5-cos(arange(windowsize,dtype='float')*2.0*pi/(windowsize-1))*0.5
window=pow(1.0-pow(linspace(-1.0,1.0,windowsize),2.0),1.25)

old_windowed_buf=zeros((2,windowsize))
old_windowed_buf=zeros((nchannels,windowsize))
# hinv_sqrt2=(1+sqrt(0.5))*0.5
# hinv_buf=2.0*(hinv_sqrt2-(1.0-hinv_sqrt2)*cos(arange(half_windowsize,dtype='float')*2.0*pi/half_windowsize))/hinv_sqrt2

Expand All @@ -88,7 +88,7 @@ def paulstretch(samplerate,smp,stretch,windowsize_seconds,outfilename):
istart_pos=int(floor(start_pos))
buf=smp[:,istart_pos:istart_pos+windowsize]
if buf.shape[1]<windowsize:
buf=append(buf,zeros((2,windowsize-buf.shape[1])),1)
buf=append(buf,zeros((nchannels,windowsize-buf.shape[1])),1)
buf=buf*window

#get the amplitudes of the frequency components and discard the phases
Expand Down Expand Up @@ -148,4 +148,3 @@ def paulstretch(samplerate,smp,stretch,windowsize_seconds,outfilename):
paulstretch(samplerate,smp,options.stretch,options.window_size,args[1])