source: python/aubio/gnuplot.py @ 61680aa

"""Copyright (C) 2004 Paul Brossier <piem@altern.org>
print aubio.__LICENSE__ for the terms of use
"""

__LICENSE__ = """\
         Copyright (C) 2004 Paul Brossier <piem@altern.org>

         This program is free software; you can redistribute it and/or modify
         it under the terms of the GNU General Public License as published by
         the Free Software Foundation; either version 2 of the License, or
         (at your option) any later version.

         This program is distributed in the hope that it will be useful,
         but WITHOUT ANY WARRANTY; without even the implied warranty of
         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
         GNU General Public License for more details.

         You should have received a copy of the GNU General Public License
         along with this program; if not, write to the Free Software
         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
"""


__notesheight = 0.25


def audio_to_array(filename):
        import aubio.aubioclass
        import numarray
        hopsize  = 2048
        filei    = aubio.aubioclass.sndfile(filename)
        framestep = 1/(filei.samplerate()+0.)
        channels = filei.channels()
        myvec    = aubio.aubioclass.fvec(hopsize,channels)
        data = []
        readsize = hopsize
        while (readsize==hopsize):
                readsize = filei.read(hopsize,myvec)
                #for i in range(channels):
                i = 0
                curpos = 0
                while (curpos < readsize):
                        data.append(myvec.get(curpos,i))
                        curpos+=1
        time = numarray.arange(len(data))*framestep
        return time,data

def plot_audio(filenames, fileout=None, start=0, end=None, noaxis=None):
        g = gnuplot_init(fileout)
        d = []
        todraw = len(filenames)
        xorig = 0.
        xsize = 1./todraw
        g.gnuplot('set multiplot;')
        while (len(filenames)):
                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)')
                        g.ylabel('Amplitude')
                g.gnuplot('set size %f,1.;' % (xsize) )
                g.gnuplot('set origin %f,0.;' % (xorig) )
                g.gnuplot('set style data lines; \
                        set yrange [-1.:1.]; \
                        set xrange [0:%f]' % time[-1]) 
                g.plot(d.pop(0))
                xorig += 1./todraw
        g.gnuplot('unset multiplot;')

def downsample_audio(time,data,maxpoints=10000):
        """ create gnuplot plot from an audio file """
        import numarray
        length = len(time)
        downsample = length/maxpoints
        if downsample == 0: downsample = 1
        x = numarray.array(time).resize(length)[0:-1:downsample]
        y = numarray.array(data).resize(length)[0:-1:downsample]
        return x,y

def make_audio_plot(time,data,maxpoints=10000):
        """ create gnuplot plot from an audio file """
        import numarray
        import Gnuplot, Gnuplot.funcutils
        length = len(time)
        downsample = length/maxpoints
        if downsample == 0: downsample = 1
        x = numarray.array(time).resize(length)[0:-1:downsample]
        y = numarray.array(data).resize(length)[0:-1:downsample]
        return Gnuplot.Data(x,y,with='lines')


def plot_onsets(filename, onsets, ofunc, samplerate=44100., hopsize=512, outplot=None):
        import Gnuplot, Gnuplot.funcutils
        import aubio.txtfile
        import os.path
        import numarray
        import re
        from aubio.onsetcompare import onset_roc

        d,d2 = [],[]
        maxofunc = 0
        for i in range(len(onsets)):
                if len(onsets[i]) == 0: onsets[i] = [0.];

                # onset detection function 
                downtime = (hopsize/samplerate)*numarray.arange(len(ofunc[i]))
                d.append(Gnuplot.Data(downtime,ofunc[i],with='lines'))
                maxofunc = max(max(ofunc[i]), maxofunc)

        for i in range(len(onsets)):
                # detected onsets
                x1 = (hopsize/samplerate)*numarray.array(onsets[i])
                y1 = maxofunc*numarray.ones(len(onsets[i]))
                d.append(Gnuplot.Data(x1,y1,with='impulses'))
                d2.append(Gnuplot.Data(x1,-y1,with='impulses'))

        # check if datafile exists truth
        datafile = filename.replace('.wav','.txt')
        if datafile == filename: datafile = ""
        if not os.path.isfile(datafile):
                title = "truth file not found"
                t = Gnuplot.Data(0,0,with='impulses') 
        else:
                t_onsets = aubio.txtfile.read_datafile(datafile)
                y2 = maxofunc*numarray.ones(len(t_onsets))
                x2 = numarray.array(t_onsets).resize(len(t_onsets))
                d2.append(Gnuplot.Data(x2,y2,with='impulses'))
                
                tol = 0.050 

                orig, missed, merged, expc, bad, doubled = \
                        onset_roc(x2,x1,tol)
                title = "GD %2.3f%% FP %2.3f%%" % \
                        ((100*float(orig-missed-merged)/(orig)),
                         (100*float(bad+doubled)/(orig)))

        # audio data
        time,data = audio_to_array(filename)
        d2.append(make_audio_plot(time,data))

        # prepare the plot
        g = gnuplot_init(outplot)

        g('set title \'%s %s\'' % (re.sub('.*/','',filename),title))

        g('set multiplot')

        # hack to align left axis
        g('set lmargin 15')

        # plot waveform and onsets
        g('set size 1,0.3')
        g('set origin 0,0.7')
        g('set xrange [0:%f]' % max(time)) 
        g('set yrange [-1:1]') 
        g.ylabel('amplitude')
        g.plot(*d2)
        
        g('unset title')

        # plot onset detection function
        g('set size 1,0.7')
        g('set origin 0,0')
        g('set xrange [0:%f]' % (hopsize/samplerate*len(ofunc[0])))
        g('set yrange [0:%f]' % (maxofunc*1.01))
        g.xlabel('time')
        g.ylabel('onset detection value')
        g.plot(*d)

        g('unset multiplot')


def plot_pitch(filename, pitch, samplerate=44100., hopsize=512, outplot=None):
        import aubio.txtfile
        import os.path
        import numarray
        import Gnuplot
        import re

        d = []
        maxpitch = 100
        for i in range(len(pitch)):
                downtime = (hopsize/samplerate)*numarray.arange(len(pitch[i]))
                d.append(Gnuplot.Data(downtime,pitch[i],with='lines',
                        title=('%d' % i)))
                maxpitch = max(maxpitch,max(pitch[i][:])*1.1)

        # check if ground truth exists
        datafile = filename.replace('.wav','.txt')
        if datafile == filename: datafile = ""
        if not os.path.isfile(datafile):
                title = "truth file not found"
                t = Gnuplot.Data(0,0,with='impulses') 
        else:
                title = "truth file plotting not implemented yet"
                values = aubio.txtfile.read_datafile(datafile)
                if (len(datafile[0])) > 1:
                        time, pitch = [], []
                        for i in range(len(values)):
                                time.append(values[i][0])
                                pitch.append(values[i][1])
                        d.append(Gnuplot.Data(time,pitch,with='lines',
                                title='ground truth'))
                
        # audio data
        time,data = audio_to_array(filename)
        f = make_audio_plot(time,data)

        g = gnuplot_init(outplot)
        g('set title \'%s %s\'' % (re.sub('.*/','',filename),title))
        g('set multiplot')
        # hack to align left axis
        g('set lmargin 15')
        # plot waveform and onsets
        g('set size 1,0.3')
        g('set origin 0,0.7')
        g('set xrange [0:%f]' % max(time)) 
        g('set yrange [-1:1]') 
        g.ylabel('amplitude')
        g.plot(f)
        g('unset title')
        # plot onset detection function
        g('set size 1,0.7')
        g('set origin 0,0')
        g('set xrange [0:%f]' % max(time))
        g('set yrange [40:%f]' % maxpitch) 
        g('set key right top')
        g.xlabel('time')
        g.ylabel('frequency (Hz)')
        g.plot(*d)
        g('unset multiplot')

def gnuplot_init(outplot,debug=0,persist=1):
        import Gnuplot
        # prepare the plot
        g = Gnuplot.Gnuplot(debug=debug, persist=persist)
        if outplot == 'stdout':
                g("set terminal png fontfile 'p052023l.pfb'")
                #g('set output \'%s\'' % outplot)
        elif outplot:
                extension = outplot.split('.')[-1]
                if extension == 'ps': extension = 'postscript'
                g('set terminal %s' % extension)
                g('set output \'%s\'' % outplot)
        return g