gnu: alsa-modular-synth: Add patch to fix vocoder build error.

* gnu/packages/patches/alsa-modular-synth-fix-vocoder.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/audio.scm (alsa-modular-synth)[source]: Add it.

1 files changed, 522 insertions, 0 deletions

diff --git a/gnu/packages/patches/alsa-modular-synth-fix-vocoder.patch b/gnu/packages/patches/alsa-modular-synth-fix-vocoder.patch
new file mode 100644
index 0000000000..33a68a1dd8
--- /dev/null
+++ b/gnu/packages/patches/alsa-modular-synth-fix-vocoder.patch
@@ -0,0 +1,522 @@
+This patch was taken from Debian.
+https://salsa.debian.org/multimedia-team/ams/-/raw/master/debian/patches/0007-Make-vocoder-module-compatible-to-C-11.patch
+
+From: Guido Scholz <gscholz@users.sourceforge.net>
+Date: Tue, 6 Nov 2018 21:55:38 +0100
+Subject: Make vocoder module compatible to C++11
+
+---
+ src/m_vocoder.cpp | 218 +++++++++++++++++++++++++++---------------------------
+ src/m_vocoder.h   |  31 ++++----
+ 2 files changed, 124 insertions(+), 125 deletions(-)
+
+diff --git a/src/m_vocoder.cpp b/src/m_vocoder.cpp
+index 572cf65..371e2cf 100644
+--- a/src/m_vocoder.cpp
++++ b/src/m_vocoder.cpp
+@@ -18,10 +18,6 @@
+   along with ams.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+-#include <stdio.h>
+-#include <stdlib.h>
+-#include <unistd.h>
+-#include <math.h>
+ #include <qwidget.h>
+ #include <qstring.h>
+ #include <qslider.h>
+@@ -36,16 +32,13 @@
+ #include "synthdata.h"
+ #include "midicheckbox.h"
+ #include "midislider.h"
+-// For FFTW to be happy we must include complex.h before fftw3.h
+-#include <complex.h>
+-#include <fftw3.h>
+ #include "port.h"
+ #include "m_vocoder.h"
+ 
+ //   Window function - One way to make the FFT behave
+ //   and give more continuous results over edge steps.
+ 
+-float M_vocoder::windowcurve (int windowfunc, int len, int elem, float alpha)
++float M_vocoder::windowcurve (int windowfunc, unsigned int len, int elem, float alpha)
+ {
+   float out;
+   out = 1.0;
+@@ -98,6 +91,7 @@ float M_vocoder::windowcurve (int windowfunc, int len, int elem, float alpha)
+   return (out);
+ }
+ 
++
+ M_vocoder::M_vocoder(QWidget* parent, int id)
+   : Module(M_type_vocoder, id, 5, parent, tr("FFT Vocoder"))
+ {
+@@ -160,6 +154,7 @@ M_vocoder::M_vocoder(QWidget* parent, int id)
+     modbuf[l1] = (float *)malloc( fftsize * sizeof(float));
+     memset( modbuf[l1], 0, fftsize * sizeof(float));
+   }
++
+   carrbuf = (float **)malloc(synthdata->poly * sizeof(float *));
+   for (l1 = 0; l1 < synthdata->poly; l1++) {
+     carrbuf[l1] = (float *)malloc( fftsize * sizeof(float));
+@@ -175,38 +170,48 @@ M_vocoder::M_vocoder(QWidget* parent, int id)
+     window[l2] = windowcurve (whichwin, fftsize, l2, 0.25);
+ 
+   //  FFTW setup stuff
+-  carrinforward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					    * fftsize);
+-  carrinbackward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					     * fftsize);
+-  carroutforward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					     * fftsize);
+-  carroutbackward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					      * fftsize);
+-  modinforward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					    * fftsize);
+-  modinbackward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					     * fftsize);
+-  modoutforward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					     * fftsize);
+-  modoutbackward = (fftw_complex *) fftw_malloc (sizeof (fftw_complex)
+-					      * fftsize);
+-  fftw_set_timelimit (5.0);
+-  planmodforward = fftw_plan_dft_1d (fftsize, modinforward,
+-				  modoutforward, FFTW_FORWARD, FFTW_MEASURE);
+-  planmodbackward = fftw_plan_dft_1d (fftsize, modinbackward,
+- 				  modoutbackward, FFTW_BACKWARD, FFTW_MEASURE);
+-  plancarrforward = fftw_plan_dft_1d (fftsize, carrinforward,
+-				  carroutforward, FFTW_FORWARD, FFTW_MEASURE);
+-  plancarrbackward = fftw_plan_dft_1d (fftsize, carrinbackward,
+- 				  carroutbackward, FFTW_BACKWARD, FFTW_MEASURE);
++  carrinforward.reserve(fftsize);
++  carrinbackward.reserve(fftsize);
++  carroutforward.reserve(fftsize);
++  carroutbackward.reserve(fftsize);
++  modinforward.reserve(fftsize);
++  modinbackward.reserve(fftsize);
++  modoutforward.reserve(fftsize);
++  modoutbackward.reserve(fftsize);
++
++  fftw_set_timelimit(5.0);
++
++  planmodforward = fftw_plan_dft_1d(fftsize,
++          reinterpret_cast<fftw_complex*> (modinforward.data()),
++          reinterpret_cast<fftw_complex*> (modoutforward.data()),
++          FFTW_FORWARD, FFTW_MEASURE);
++
++  planmodbackward = fftw_plan_dft_1d(fftsize,
++          reinterpret_cast<fftw_complex*> (modinbackward.data()),
++          reinterpret_cast<fftw_complex*> (modoutbackward.data()),
++          FFTW_BACKWARD, FFTW_MEASURE);
++
++  plancarrforward = fftw_plan_dft_1d(fftsize,
++          reinterpret_cast<fftw_complex*> (carrinforward.data()),
++          reinterpret_cast<fftw_complex*> (carroutforward.data()),
++          FFTW_FORWARD, FFTW_MEASURE);
++
++  plancarrbackward = fftw_plan_dft_1d(fftsize,
++          reinterpret_cast<fftw_complex*> (carrinbackward.data()),
++          reinterpret_cast<fftw_complex*> (carroutbackward.data()),
++          FFTW_BACKWARD, FFTW_MEASURE);
+ }
+ 
++
+ M_vocoder::~M_vocoder() {
+ 
+-  int l1;
++  //    Clean up FFTW stuff.
++  fftw_destroy_plan (plancarrforward);
++  fftw_destroy_plan (plancarrbackward);
++  fftw_destroy_plan (planmodforward);
++  fftw_destroy_plan (planmodbackward);
+ 
+-  for (l1 = 0; l1 < synthdata->poly; l1++) {
++  for (int l1 = 0; l1 < synthdata->poly; l1++) {
+     free(modbuf[l1]);
+     free(carrbuf[l1]);
+   }
+@@ -215,29 +220,14 @@ M_vocoder::~M_vocoder() {
+   free (window);
+   free (modmap);
+   free (armodmap);
+-
+-  //#define FFTW_CLEANUP
+-#ifdef FFTW_CLEANUP
+-  //    Clean up FFTW stuff.
+-  fftw_destroy_plan (plancarrforward);
+-  fftw_destroy_plan (plancarrbackward);
+-  fftw_destroy_plan (planmodforward);
+-  fftw_destroy_plan (planmodbackward);
+-  fftw_free (carrinforward);
+-  fftw_free (carrinbackward);
+-  fftw_free (carroutforward);
+-  fftw_free (carroutbackward);
+-  fftw_free (modinforward);
+-  fftw_free (modinbackward);
+-  fftw_free (modoutforward);
+-  fftw_free (modoutbackward);
+-#endif
+ }
+ 
++
+ void M_vocoder::generateCycle() {
+ 
+   int l1;  //  l1 indexes along polyphony.
+   unsigned int l2;  // l2 indexes along the cycle
++  const std::complex<double> I(0.0, 1.0);
+ 
+   inModulator = port_M_modulator->getinputdata();
+   inPitchShift = port_M_pitchshift->getinputdata();
+@@ -272,7 +262,7 @@ void M_vocoder::generateCycle() {
+   //   Did the user change the FFT windowing function?
+   if (myFFTWindowFunc != whichwin) {
+     whichwin = myFFTWindowFunc;
+-    for (l2 = 0; l2 < (unsigned int) fftsize; l2++)
++    for (l2 = 0; l2 < fftsize; l2++)
+       window[l2] = windowcurve (whichwin, fftsize, l2, 0.25);
+   }
+ 
+@@ -294,7 +284,7 @@ void M_vocoder::generateCycle() {
+     }
+ 
+     //    window the input buffer to modinforward
+-    for (l2 = 0; l2 < (unsigned int)fftsize ; l2++) {
++    for (l2 = 0; l2 < fftsize ; l2++) {
+       modinforward[l2] = modbuf[l1][l2] * window[l2];
+     }
+ 
+@@ -310,17 +300,18 @@ void M_vocoder::generateCycle() {
+     fftw_execute (planmodforward);
+ 
+     //    copy the FFT of the modulator to modinbackward.
+-    for (l2 = 0; l2 < (unsigned int)fftsize; l2++)
+-      modinbackward[l2] = modoutforward[l2];
++    //for (l2 = 0; l2 < fftsize; l2++)
++    //  modinbackward[l2] = modoutforward[l2];
++    modinbackward = modoutforward;
+ 
+     //     Send the FFT of the modulator to the output for giggles
+     //     and get an approximation of the first harmonic too.
+     float firstharmonicval;
+     int firstharmonicindex;
+     firstharmonicval = 0.0;
+-    firstharmonicindex = 1.0;
++    firstharmonicindex = 1;
+     for (l2 = 1; l2 < (unsigned int) synthdata->cyclesize; l2++) {
+-      data[2][l1][l2] = logf(fabs (creal (modoutforward[l2])) + 1.0);
++      data[2][l1][l2] = logf(fabs(modoutforward[l2].real()) + 1.0);
+       if (data[2][l1][l2] > firstharmonicval) {
+ 	firstharmonicindex = l2;
+ 	firstharmonicval  = data[2][l1][l2] ;
+@@ -333,35 +324,38 @@ void M_vocoder::generateCycle() {
+ 
+     //   intermediate frequency-domain munging of modulator
+     //   Frequency (additive, Bode-style) shifting first
+-    for (l2 = 0; l2 < (unsigned int)fftsize; l2++)
+-      modinbackward[l2] = 0;
++    for (l2 = 0; l2 < fftsize; l2++)
++      modinbackward[l2] = 0.0;
++
+     int lclfrq;
+-    for (l2 = 0; l2 < (unsigned int)fftsize/2; l2++) {
++    for (l2 = 0; l2 < fftsize/2; l2++) {
+       //   positive frequencies (first half) of the FFT result
+       lclfrq = l2 + (int)freqshift + vcfreqshift * inFreqShift[l1][0];
+       lclfrq = lclfrq > 0 ? lclfrq : 0;
+-      lclfrq = lclfrq < ((fftsize/2)-1) ? lclfrq : (fftsize/2)-1;
++      lclfrq = lclfrq < (int)((fftsize/2)-1) ? lclfrq : (fftsize/2)-1;
+       modinbackward [lclfrq] = modoutforward [l2];
+       //   Negative frequencies (second half of the fft result)
+-      modinbackward [fftsize - lclfrq] = modoutforward [ fftsize - l2];
++      modinbackward [fftsize - lclfrq] = modoutforward [fftsize - l2];
+     }
+ 
+-    //    Pitchshifting (multiplicative, harmonic-retaining) shifting.
+-    //    Note that we reuse the modoutforward as working space
+-    for (l2 = 0; l2 < (unsigned int) fftsize; l2++) {
+-      modoutforward[l2] = modinbackward[l2];
+-    };
+-    for (l2 = 0; l2 < (unsigned int)fftsize; l2++)
+-      modinbackward[l2] = 0;
++    // Pitchshifting (multiplicative, harmonic-retaining) shifting.
++    // Note that we reuse the modoutforward as working space
++    //for (l2 = 0; l2 < fftsize; l2++) {
++    //  modoutforward[l2] = modinbackward[l2];
++    //};
++    modoutforward = modinbackward;
++
++    for (l2 = 0; l2 < fftsize; l2++)
++      modinbackward[l2] = 0.0;
+ 
+     float psmod, psfactor;
+     psmod = (pitchshift + vcpitch * inPitchShift[l1][0]);
+     psfactor = pow (2.0, psmod);
+-    for (l2 = 0; l2 < (unsigned int)fftsize/2; l2++) {
++    for (l2 = 0; l2 < fftsize/2; l2++) {
+       //   positive frequencies (first half) of the FFT result
+       lclfrq = l2 * psfactor;
+       lclfrq = lclfrq > 0 ? lclfrq : 0;
+-      lclfrq = lclfrq < ((fftsize/2)-1) ? lclfrq : (fftsize/2)-1;
++      lclfrq = lclfrq < (int)((fftsize/2)-1) ? lclfrq : (fftsize/2)-1;
+       //   Old way to pitch shift: just move the bucket.  But this puts
+       //   nulls wherever the energy is split between two buckets with
+       //   a 180 degree phase difference.
+@@ -375,12 +369,12 @@ void M_vocoder::generateCycle() {
+ 	  //   Better way: move freq. bin, multiply angle by octave motion.
+ 	  //
+ 	  modinbackward[lclfrq] +=
+-	    cabs (modoutforward [l2])
+-	    * cexp (I * ( carg (modoutforward [l2])
++	    std::abs(modoutforward[l2])
++	    * std::exp (I * ( std::arg (modoutforward [l2])
+ 			  + (l2 * phaseshift * psfactor)));
+ 	  modinbackward[fftsize - lclfrq] +=
+-	    cabs (modoutforward [ fftsize - l2])
+-	    * cexp (I * ( carg (modoutforward [ fftsize - l2])
++	    std::abs (modoutforward [ fftsize - l2])
++	    * std::exp (I * ( std::arg (modoutforward [ fftsize - l2])
+ 			  + (l2 * phaseshift * psfactor)));
+ 	};
+     }
+@@ -389,9 +383,9 @@ void M_vocoder::generateCycle() {
+     fftw_execute (planmodbackward);
+ 
+     //   renormalize the time-domain modulator output
+-    for (l2 = 0; l2 < (unsigned)fftsize; l2++) {
+-      modoutbackward [l2] = modoutbackward[l2] / float (fftsize) ;
+-      modoutbackward [l2] = modoutbackward[l2] / window[l2];
++    for (l2 = 0; l2 < fftsize; l2++) {
++      modoutbackward [l2] = modoutbackward[l2] / (double) fftsize;
++      modoutbackward [l2] = modoutbackward[l2] / (double) window[l2];
+     }
+ 
+     unsigned int i;
+@@ -400,13 +394,11 @@ void M_vocoder::generateCycle() {
+ 
+ 
+     //     Splicing the new output to the results
+-    if (dynsplice == 0.0)
+-      {
++    if (dynsplice == 0.0) {
+ 	//   output it as the altered modulator.
+ 	for (l2 = 0; l2 < synthdata->cyclesize; l2++) {
+-	  data[0][l1][l2] = creal ( modoutbackward [l2 +
+-						    fftsize/2 -
+-						    synthdata->cyclesize/2 ]);
++	  data[0][l1][l2] =
++              modoutbackward[l2 + fftsize/2 - synthdata->cyclesize/2].real();
+ 	}
+ 	clomatch_index = fftsize - synthdata->cyclesize;
+       }
+@@ -421,18 +413,21 @@ void M_vocoder::generateCycle() {
+ 	float tval, dtval;
+ 	int searchstart;
+ 	float spliceval, dspliceval;
+-	searchstart = fftsize/2 - synthdata->cyclesize;
+-	if (searchstart < 1) searchstart = 1;
+-	clomatch_index = searchstart;
++
++        searchstart = fftsize/2 - synthdata->cyclesize;
++        if (searchstart < 1)
++            searchstart = 1;
++
++        clomatch_index = searchstart;
+ 	spliceval = data[0][l1][synthdata->cyclesize - 1];
+ 	dspliceval = spliceval - data[0][l1][synthdata->cyclesize - 2];
+-	clov_sofar= fabs(creal(modoutbackward[clomatch_index])-spliceval );
++	clov_sofar= fabs(modoutbackward[clomatch_index].real()-spliceval);
+ 	for (l2 = searchstart;
+ 	     l2 < (searchstart + synthdata->cyclesize);
+ 	     l2++)
+ 	  {
+-	    tval = creal (modoutbackward[l2]);
+-	    dtval = tval - creal (modoutbackward [l2-1]);
++	    tval = modoutbackward[l2].real();
++	    dtval = tval - modoutbackward [l2-1].real();
+ 	    if (
+ 		((fabs (tval - spliceval )) < clov_sofar )
+ 		&& ((dtval * dspliceval ) >= 0)
+@@ -445,15 +440,15 @@ void M_vocoder::generateCycle() {
+ 	  };
+ 	//  fprintf (stderr, "%d %f %f ",
+ 	//      clomatch_index, clov_sofar, clodv_sofar);
+-	
++
+ 	//   What's our residual error, so that we can splice this
+ 	//   with minimal "click"?
+-	residual = + spliceval - creal( modoutbackward[clomatch_index]);
++	residual = + spliceval - modoutbackward[clomatch_index].real();
+ 
+ 	//  Move our wave, with the best match so far established, to
+ 	//   the output buffer area.
+ 	for (l2 = 0; l2 < synthdata->cyclesize; l2++) {
+-	  data[0][l1][l2] = creal ( modoutbackward [ clomatch_index + l2])
++	  data[0][l1][l2] = modoutbackward[clomatch_index + l2].real()
+ 	    + ((1.0 - (float(l2) / float(synthdata->cyclesize))) * residual);
+ 	};
+ 
+@@ -466,17 +461,18 @@ void M_vocoder::generateCycle() {
+     for (l2 = 0; l2 < fftsize - synthdata->cyclesize; l2++) {
+       carrbuf [l1][l2] = carrbuf [l1][l2 + synthdata->cyclesize];
+     }
++
+     for (l2 = 0; l2 < synthdata->cyclesize; l2++) {
+       carrbuf [l1][l2 + fftsize - synthdata->cyclesize] = inCarrier[l1][l2];
+     }
+ 
+-    for (l2 = 0; l2 <  unsigned (fftsize); l2++) {
++    for (l2 = 0; l2 < fftsize; l2++) {
+       carrinforward [l2] = carrbuf [l1][l2] * window[l2];
+     }
+ 
+     fftw_execute (plancarrforward);
+ 
+-    for (l2 = 0; l2 < (unsigned) fftsize; l2++) {
++    for (l2 = 0; l2 < fftsize; l2++) {
+       carrinbackward[l2] = carroutforward[l2];
+     };
+ 
+@@ -486,34 +482,37 @@ void M_vocoder::generateCycle() {
+     //   Group the modulator into channels, and multipy the channels
+     //   over the carrier.
+ 
+-    int localchannels;
+-    localchannels = channels + vcchannels * inChannels[l1][0];
+-    if (localchannels < 1) localchannels = 1;
+-    if (localchannels > fftsize - 1) localchannels = fftsize - 1;
+-    for (l2 = 0; l2 < (unsigned) fftsize; l2++) {
++    unsigned int localchannels = channels + vcchannels * inChannels[l1][0];
++    if (localchannels < 1)
++        localchannels = 1;
++
++    if (localchannels > fftsize - 1)
++        localchannels = fftsize - 1;
++
++    for (l2 = 0; l2 < fftsize; l2++) {
+       modmap[l2] = 0;
+       //       initial conditions...
+       if (l2 == 0)
+ 	for (i = 0; i < channels; i++)
+-	  modmap[l2] += cabs (modoutforward[l2 + i]);
++	  modmap[l2] += std::abs(modoutforward[l2 + i]);
+       else
+ 	modmap [l2] = modmap[l2 - 1];
+ 
+       //    add the heads, subtract the tails
+       i = l2 + channels;
+-      if (l2 < (unsigned)fftsize - 2)
+-	modmap[l2] += cabs( modoutforward [i] );
++      if (l2 < fftsize - 2)
++	modmap[l2] += std::abs(modoutforward[i]);
+       i = l2 - channels;
+       if (l2 >= channels)
+-	modmap[l2] -= cabs( modoutforward [i] );
++	modmap[l2] -= std::abs(modoutforward[i]);
+     }
+ 
+     //   Normalize the modmap
+-    for (l2 = 0; l2 < (unsigned) fftsize; l2++)
++    for (l2 = 0; l2 < fftsize; l2++)
+       modmap[l2] = modmap[l2] / localchannels;
+ 
+     //   Do attack/release
+-    for (l2 = 0; l2 < (unsigned) fftsize; l2++) {
++    for (l2 = 0; l2 < fftsize; l2++) {
+       if (modmap [l2] > armodmap[l2])
+ 	armodmap [l2] += (1 - attack) * (modmap[l2] - armodmap[l2]);
+       if (modmap [l2] < armodmap[l2])
+@@ -521,8 +520,8 @@ void M_vocoder::generateCycle() {
+     }
+ 
+     //   multiply the carrier by the modulation map.
+-    for (l2 = 0; l2 < (unsigned) fftsize; l2++) {
+-      carrinbackward[l2] = carroutforward[l2] * armodmap[l2];
++    for (l2 = 0; l2 < fftsize; l2++) {
++      carrinbackward[l2] = carroutforward[l2] * (double) armodmap[l2];
+     }
+ 
+     //   reverse transform to final output, and renormalize by 1/fftsize.
+@@ -532,8 +531,7 @@ void M_vocoder::generateCycle() {
+     for (l2 = 0; l2 < synthdata->cyclesize; l2++) {
+       offset = l2 + (fftsize/2) - (synthdata->cyclesize / 2);
+       data[1][l1][l2]=
+-	(creal(carroutbackward[offset]/window[offset])) / (fftsize * 100);
++	(carroutbackward[offset].real()/window[offset]) / (fftsize * 100);
+     };
+   };
+ }
+-
+diff --git a/src/m_vocoder.h b/src/m_vocoder.h
+index 38eac58..32c8521 100644
+--- a/src/m_vocoder.h
++++ b/src/m_vocoder.h
+@@ -1,4 +1,4 @@
+-/* 
++/*
+   Vocoder - derived from m_delay.cpp
+ 
+   Copyright (C) 2011 Bill Yerazunis <yerazunis@yahoo.com>
+@@ -22,7 +22,9 @@
+ #define M_VOCODER_H
+ 
+ #include "module.h"
+-#include <complex.h>
++
++#include <vector>
++#include <ccomplex>
+ #include <fftw3.h>
+ 
+ #define MODULE_VOCODER_WIDTH                 105
+@@ -30,7 +32,7 @@
+ 
+ class M_vocoder : public Module
+ {
+-    Q_OBJECT 
++    Q_OBJECT
+ 
+     float channels, vcchannels;
+     float attack, release;
+@@ -42,21 +44,20 @@ class M_vocoder : public Module
+ 
+     Port *port_M_modulator, *port_M_pitchshift, *port_M_freqshift,
+       *port_M_channels, *port_M_carrier;
++
+     Port *port_modfft_out, *port_firstharmonic_out,
+-      *port_altmodulator_out, 
+-      *port_vocoder_out;
++      *port_altmodulator_out, *port_vocoder_out;
+ 
+-    fftw_plan planmodforward, planmodbackward, 
++    fftw_plan planmodforward, planmodbackward,
+       plancarrforward, plancarrbackward;
+ 
+-    fftw_complex *carrinforward, *carroutforward, 
+-      *carrinbackward, *carroutbackward,
+-      *modinforward, *modoutforward, 
+-      *modinbackward, *modoutbackward;
++    std::vector<std::complex<double>> carrinforward, carroutforward,
++        carrinbackward, carroutbackward,
++        modinforward, modoutforward,
++        modinbackward, modoutbackward;
+ 
+-  public: 
+-    int fftsize;
+-    float **inModulator, **inPitchShift, **inFreqShift, 
++    unsigned int fftsize;
++    float **inModulator, **inPitchShift, **inFreqShift,
+       **inChannels, **inCarrier;
+     // the previous time-based samples, for overlapping
+     float **modbuf, **carrbuf;
+@@ -68,10 +69,10 @@ class M_vocoder : public Module
+     float *armodmap;
+ 
+   public:
+-    float windowcurve (int windowfunc, int len, int elem, float alpha );
++    float windowcurve (int windowfunc, unsigned int len, int elem, float alpha );
+     M_vocoder(QWidget* parent=0, int id = 0);
+     ~M_vocoder();
+     void generateCycle();
+ };
+-  
++
+ #endif