Changeset 431e9d8 for python/aubio

Timestamp:

Mar 1, 2006, 4:14:08 AM (19 years ago)

Author:

Paul Brossier <piem@altern.org>

Branches:

feature/autosink, feature/cnn, feature/cnn_org, feature/constantq, feature/crepe, feature/crepe_org, feature/pitchshift, feature/pydocstrings, feature/timestretch, fix/ffmpeg5, master, pitchshift, sampler, timestretch, yinfft+

Children:

dcc8d90

Parents:

7c206df

Message:

add spectrogram plot
add spectrogram plot

File:

• python/aubio/gnuplot.py (modified) (4 diffs)

python/aubio/gnuplot.py

@@ -54 +54 @@
         g.gnuplot('set multiplot;')
         while (len(filenames)):
-                time,data = audio_to_array(filenames.pop(0))
-                d.append(make_audio_plot(time,data))
+                time,data = audio_to_array(filenames.pop(0))
+                d.append(make_audio_plot(time,data))
                 if not noaxis and todraw==1:
                         g.xlabel('Time (s)')
@@ -68 +68 @@
         g.gnuplot('unset multiplot;')
 
+def audio_to_spec(filename):
+        from aubioclass import fvec,cvec,pvoc,sndfile
+        from math import log
+        bufsize   = 256*16
+        hopsize   = bufsize/4 # could depend on filelength
+        filei     = sndfile(filename)
+        srate     = float(filei.samplerate())
+        framestep = hopsize/srate
+        freqstep  = srate/bufsize
+        channels  = filei.channels()
+        myvec = fvec(hopsize,channels)
+        myfft = cvec(bufsize,channels)
+        pv    = pvoc(bufsize,hopsize,channels)
+        data,time,freq = [],[],[]
+        for f in range(bufsize/2):
+                freq.append(f*freqstep)
+        readsize = hopsize
+        frameread = 0
+        while (readsize==hopsize):
+                readsize = filei.read(hopsize,myvec)
+                pv.do(myvec,myfft)
+                frame = []
+                i = 0 #for i in range(channels):
+                curpos = 0
+                while (curpos < bufsize/2):
+                        frame.append(log(myfft.get(curpos,i)**2+0.000001))
+                        curpos+=1
+                time.append(frameread*framestep)
+                data.append(frame)
+                frameread += 1
+        # crop data if unfinished frames
+        if len(data[-1]) != len(data[0]):
+                data = data[0:-2]
+                time = time[0:-2]
+        # verify size consistency
+        assert len(data) == len(time)
+        assert len(data[0]) == len(freq)
+        return data,time,freq
+
+def plot_spec(filenames, outplot='',extension='', fileout=None, start=0, end=None, noaxis=None,log=1):
+        import Gnuplot
+        g = gnuplot_create(outplot,extension)
+        todraw = len(filenames)
+        xorig = 0.
+        xsize = 1./todraw
+        data,time,freq = audio_to_spec(filenames.pop(0))
+                
+        if not noaxis and todraw==1:
+                g.xlabel('Time (s)')
+                g.ylabel('Frequency (Hz)')
+        g.gnuplot('set pm3d map')
+        #g.gnuplot('set palette rgbformulae 30,31,32')
+        #g.gnuplot('set palette')
+        g.gnuplot('set xrange [0.:%f]' % time[-1]) 
+        g.gnuplot('set yrange [1.:%f]' % (freq[-1]/1.))
+        if log:
+                g.gnuplot('set yrange [10.1:%f]' % (freq[-1]/1.))
+                g.gnuplot('set log y')
+        g.splot(Gnuplot.GridData(data,time,freq, binary=1))
+        xorig += 1./todraw
+
 def downsample_audio(time,data,maxpoints=10000):
-        """ create gnuplot plot from an audio file """
+        """ resample audio data to last only maxpoints """
         import numarray
         length = len(time)
@@ -179 +240 @@
 
         d = []
-        maxpitch = 100
+        maxpitch = 1000.
         for i in range(len(pitch)):
                 #if len(pitch[i]) == 0: pitch[i] = [0.];
@@ -228 +289 @@
         g('set yrange [40:%f]' % maxpitch) 
         g('set key right top')
+        g('set noclip one') 
         g.xlabel('time')
         g.ylabel('frequency (Hz)')