source: python/aubio/gnuplot.py @ 296c33a

"""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

from numarray import *
import Gnuplot, Gnuplot.funcutils

def plotnote(la,title=None) :
        if la[0,:].size() == 3:
                d = plotnote_withends(la, plot_title=title)
        else: 
            # scale data if in freq (for REF.txt files)
            if max(la[:,1] > 128 ):
                print "scaling frequency data to midi range"
                la[:,1] /= 6.875
                la[:,1] = log(la[:,1])/0.6931
                la[:,1] *= 12
                la[:,1] -= 3
            d = plotnote_withoutends(la, plot_title=title)
        return d

def plotnote_multi(lalist,title=None,fileout=None) :
        d=list()
        for i in range(len(lalist)):
            d.append(plotnote(lalist[i], title=title))
        return d
       

def plotnote_withends(la,plot_title=None) :
        d=[]
        x_widths = array(la[:,1]-la[:,0])/2.
        d.append(Gnuplot.Data(
                la[:,0]+x_widths,               # x centers
                la[:,2],                        # y centers
                x_widths,                       # x errors
                __notesheight*ones(len(la)),    # y errors
                title=plot_title,with=('boxxyerrorbars fs 3')))
        return d


def plotnote_withoutends(la,plot_title=None) :
        """ bug: fails drawing last note """
        d=[]
        x_widths = array(la[1:,0]-la[:-1,0])/2;
        d.append(Gnuplot.Data(
                la[:-1,0]+x_widths,             # x centers
                la[:-1,1],                      # y centers
                x_widths,                       # x errors
                __notesheight*ones(len(la)-1),  # y errors
                title=plot_title,with=('boxxyerrorbars fs 3')))
        return d

def plotnote_do(d,fileout=None):
    g = Gnuplot.Gnuplot(debug=1, persist=1)
    g.gnuplot('set style fill solid border 1; \
    set size ratio 1/6; \
    set boxwidth 0.9 relative; \
    set mxtics 2.5; \
    set mytics 2.5; \
    set xtics 5; \
    set ytics 1; \
    set grid xtics ytics mxtics mytics')

    g.xlabel('Time (s)')
    g.ylabel('Midi pitch')
    # do the plot
    #g.gnuplot('set multiplot')
    #for i in d:
    g.plot(d[0])
    #g.gnuplot('set nomultiplot') 
    if fileout != None:
        g.hardcopy(fileout, enhanced=1, color=0)

def audio_to_array(filename):
        import aubio.aubioclass
        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 = arange(len(data))*framestep
        return time,data

def plot_audio(filenames, fileout=None, start=0, end=None, noaxis=None):
        g = Gnuplot.Gnuplot(debug=1, persist=1)
        d = []
        todraw = len(filenames)
        xorig = 0.
        xsize = 1./todraw
        g.gnuplot('set multiplot;')
        while (len(filenames)):
                d.append(plot_audio_make(filenames.pop(0)))
                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]' % b[-1]) 
                g.plot(d.pop(0))
                xorig += 1./todraw
        g.gnuplot('unset multiplot;')
        if fileout != None:
                g.hardcopy(fileout, enhanced=1, color=0)

def make_audio_plot(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 Gnuplot.Data(x,y,with='lines')