Carla/source/native-plugins/zynaddsubfx/Misc/Microtonal.cpp

/*
  ZynAddSubFX - a software synthesizer

  Microtonal.cpp - Tuning settings and microtonal capabilities
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Copyright (C) 2016      Mark McCurry
  Author: Nasca Octavian Paul

  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.
*/

#include <cmath>
#include <cstring>
#include <cstdio>
#include <cassert>

#include <rtosc/ports.h>
#include <rtosc/port-sugar.h>


#include "XMLwrapper.h"
#include "Util.h"
#include "Microtonal.h"


#define MAX_LINE_SIZE 80

#define rObject Microtonal
using namespace rtosc;

/**
 * TODO
 * Consider how much of this should really exist on the rt side of things.
 * All the rt side needs is a function to map notes at various keyshifts to
 * frequencies, which does not require this many parameters...
 *
 * A good lookup table should be a good finalization of this
 */
const rtosc::Ports Microtonal::ports = {
    rToggle(Pinvertupdown, rShort("inv."), "key mapping inverse"),
    rParamZyn(Pinvertupdowncenter, rShort("center"), "center of the inversion"),
    rToggle(Penabled, rShort("enable"), "Enable for microtonal mode"),
    rParamZyn(PAnote, rShort("A note"), "The note for 'A'"),
    rParamF(PAfreq,   rShort("A freq"), "Frequency of the 'A' note"),
    rParamZyn(Pscaleshift, rShort("shift"), "UNDOCUMENTED"),
    rParamZyn(Pfirstkey, rShort("first key"), "First key to retune"),
    rParamZyn(Plastkey,  rShort("last key"), "Last key to retune"),
    rParamZyn(Pmiddlenote, rShort("middle"), "Scale degree 0 note"),

    //TODO check to see if this should be exposed
    rParamZyn(Pmapsize, "Size of key map"),
    rToggle(Pmappingenabled, "Mapping Enable"),

    rParams(Pmapping, 128, "Mapping of keys"),
    rParamZyn(Pglobalfinedetune, rShort("fine"), "Fine detune for all notes"),

    rString(Pname, MICROTONAL_MAX_NAME_LEN,    rShort("name"), "Microtonal Name"),
    rString(Pcomment, MICROTONAL_MAX_NAME_LEN, rShort("comment"), "Microtonal comments"),

    {"octavesize:", rDoc("Get octave size"), 0, [](const char*, RtData &d)
        {
            Microtonal &m = *(Microtonal*)d.obj;
            d.reply(d.loc, "i", m.getoctavesize());
        }},
    {"mapping::s", rDoc("Get user editable tunings"), 0, [](const char *msg, RtData &d)
        {
            char buf[100*MAX_OCTAVE_SIZE] = {0};
            char tmpbuf[100] = {0};
            Microtonal &m = *(Microtonal*)d.obj;
            if(rtosc_narguments(msg) == 1) {
                m.texttomapping(rtosc_argument(msg,0).s);
            } else {
                for (int i=0;i<m.Pmapsize;i++){
                    if (i!=0)
                        strncat(buf, "\n", sizeof(buf)-1);
                    if (m.Pmapping[i]==-1)
                        snprintf(tmpbuf,100,"x");
                    else
                        snprintf(tmpbuf,100,"%d",m.Pmapping[i]);
                    strncat(buf, tmpbuf, sizeof(buf)-1);
                };
                d.reply(d.loc, "s", buf);
            }
            }},
    {"tunings::s", rDoc("Get user editable tunings"), 0, [](const char *msg, RtData &d)
        {
            char buf[100*MAX_OCTAVE_SIZE] = {0};
            char tmpbuf[100] = {0};
            Microtonal &m = *(Microtonal*)d.obj;
            if(rtosc_narguments(msg) == 1) {
                int err = m.texttotunings(rtosc_argument(msg,0).s);
                if (err>=0)
                    d.reply("/alert", "s",
                            "Parse Error: The input may contain only numbers (like 232.59)\n"
                            "or divisions (like 121/64).");
                if (err==-2)
                    d.reply("/alert", "s", "Parse Error: The input is empty.");
            } else {
                for (int i=0;i<m.getoctavesize();i++){
                    if (i!=0)
                        strncat(buf, "\n", sizeof(buf)-1);
                    m.tuningtoline(i,tmpbuf,100);
                    strncat(buf, tmpbuf, sizeof(buf)-1);
                };
                d.reply(d.loc, "s", buf);
            }
        }},

#define COPY(x) self.x = other->x;
    {"paste:b", rProp(internal) rDoc("Clone Input Microtonal Object"), 0,
        [](const char *msg, RtData &d)
        {
            rtosc_blob_t b = rtosc_argument(msg, 0).b;
            assert(b.len == sizeof(void*));
            Microtonal *other = *(Microtonal**)b.data;
            Microtonal &self  = *(Microtonal*)d.obj;
            //oh how I wish there was some darn reflection for this...

            COPY(Pinvertupdown);
            COPY(Pinvertupdowncenter);
            COPY(Penabled);
            COPY(PAnote);
            COPY(PAfreq);
            COPY(Pscaleshift);
            COPY(Pfirstkey);
            COPY(Plastkey);
            COPY(Pmiddlenote);
            COPY(Pmapsize);
            COPY(Pmappingenabled);
            for(int i=0; i<self.octavesize; ++i)
                self.octave[i] = other->octave[i];
            COPY(Pglobalfinedetune);

            memcpy(self.Pname,    other->Pname,    sizeof(self.Pname));
            memcpy(self.Pcomment, other->Pcomment, sizeof(self.Pcomment));
            COPY(octavesize);

            for(int i=0; i<self.octavesize; ++i)
                self.octave[i] = other->octave[i];
            d.reply("/free", "sb", "Microtonal", b.len, b.data);
        }},
    {"paste_scl:b", rProp(internal) rDoc("Clone Input scl Object"), 0,
        [](const char *msg, RtData &d)
        {
            rtosc_blob_t b = rtosc_argument(msg, 0).b;
            assert(b.len == sizeof(void*));
            SclInfo *other = *(SclInfo**)b.data;
            Microtonal &self  = *(Microtonal*)d.obj;
            memcpy(self.Pname,    other->Pname,    sizeof(self.Pname));
            memcpy(self.Pcomment, other->Pcomment, sizeof(self.Pcomment));
            COPY(octavesize);

            for(int i=0; i<self.octavesize; ++i)
                self.octave[i] = other->octave[i];
            d.reply("/free", "sb", "SclInfo", b.len, b.data);
        }},
    {"paste_kbm:b", rProp(internal) rDoc("Clone Input kbm Object"), 0,
        [](const char *msg, RtData &d)
        {
            rtosc_blob_t b = rtosc_argument(msg, 0).b;
            assert(b.len == sizeof(void*));
            KbmInfo *other = *(KbmInfo**)b.data;
            Microtonal &self  = *(Microtonal*)d.obj;
            COPY(Pmapsize);
            COPY(Pfirstkey);
            COPY(Plastkey);
            COPY(Pmiddlenote);
            COPY(PAnote);
            COPY(PAfreq);
            COPY(Pmappingenabled);

            for(int i=0; i<128; ++i)
                self.Pmapping[i] = other->Pmapping[i];
            d.reply("/free", "sb", "KbmInfo", b.len, b.data);
        }},
#undef COPY
};


Microtonal::Microtonal(const int &gzip_compression)
    : gzip_compression(gzip_compression)
{
    defaults();
}

void Microtonal::defaults()
{
    Pinvertupdown = 0;
    Pinvertupdowncenter = 60;
    octavesize  = 12;
    Penabled    = 0;
    PAnote      = 69;
    PAfreq      = 440.0f;
    Pscaleshift = 64;

    Pfirstkey       = 0;
    Plastkey        = 127;
    Pmiddlenote     = 60;
    Pmapsize        = 12;
    Pmappingenabled = 0;

    for(int i = 0; i < 128; ++i)
        Pmapping[i] = i;

    for(int i = 0; i < MAX_OCTAVE_SIZE; ++i) {
        octave[i].tuning = powf(2, (i % octavesize + 1) / 12.0f);
        octave[i].type =  1;
        octave[i].x1   = (i % octavesize + 1) * 100;
        octave[i].x2   =  0;
    }
    octave[11].type = 2;
    octave[11].x1   = 2;
    octave[11].x2   = 1;
    for(int i = 0; i < MICROTONAL_MAX_NAME_LEN; ++i) {
        Pname[i]    = '\0';
        Pcomment[i] = '\0';
    }
    snprintf((char *) Pname, MICROTONAL_MAX_NAME_LEN, "12tET");
    snprintf((char *) Pcomment,
             MICROTONAL_MAX_NAME_LEN,
             "Equal Temperament 12 notes per octave");
    Pglobalfinedetune = 64;
}

Microtonal::~Microtonal()
{}

/*
 * Get the size of the octave
 */
unsigned char Microtonal::getoctavesize() const
{
    if(Penabled != 0)
        return octavesize;
    else
        return 12;
}

/*
 * Get the frequency according the note number
 */
float Microtonal::getnotefreq(int note, int keyshift) const
{
    // in this function will appears many times things like this:
    // var=(a+b*100)%b
    // I had written this way because if I use var=a%b gives unwanted results when a<0
    // This is the same with divisions.

    if((Pinvertupdown != 0) && ((Pmappingenabled == 0) || (Penabled == 0)))
        note = (int) Pinvertupdowncenter * 2 - note;

    //compute global fine detune
    float globalfinedetunerap =
        powf(2.0f, (Pglobalfinedetune - 64.0f) / 1200.0f);       //-64.0f .. 63.0f cents

    if(Penabled == 0) //12tET
        return powf(2.0f,
                    (note - PAnote
                     + keyshift) / 12.0f) * PAfreq * globalfinedetunerap;

    int scaleshift =
        ((int)Pscaleshift - 64 + (int) octavesize * 100) % octavesize;

    //compute the keyshift
    float rap_keyshift = 1.0f;
    if(keyshift != 0) {
        int kskey = (keyshift + (int)octavesize * 100) % octavesize;
        int ksoct = (keyshift + (int)octavesize * 100) / octavesize - 100;
        rap_keyshift  = (kskey == 0) ? (1.0f) : (octave[kskey - 1].tuning);
        rap_keyshift *= powf(octave[octavesize - 1].tuning, ksoct);
    }

    //if the mapping is enabled
    if(Pmappingenabled) {
        if((note < Pfirstkey) || (note > Plastkey))
            return -1.0f;
        //Compute how many mapped keys are from middle note to reference note
        //and find out the proportion between the freq. of middle note and "A" note
        int tmp = PAnote - Pmiddlenote, minus = 0;
        if(tmp < 0) {
            tmp   = -tmp;
            minus = 1;
        }
        int deltanote = 0;
        for(int i = 0; i < tmp; ++i)
            if(Pmapping[i % Pmapsize] >= 0)
                deltanote++;
        float rap_anote_middlenote =
            (deltanote ==
             0) ? (1.0f) : (octave[(deltanote - 1) % octavesize].tuning);
        if(deltanote)
            rap_anote_middlenote *=
                powf(octave[octavesize - 1].tuning,
                     (deltanote - 1) / octavesize);
        if(minus)
            rap_anote_middlenote = 1.0f / rap_anote_middlenote;

        //Convert from note (midi) to degree (note from the tunning)
        int degoct =
            (note - (int)Pmiddlenote + (int) Pmapsize
             * 200) / (int)Pmapsize - 200;
        int degkey = (note - Pmiddlenote + (int)Pmapsize * 100) % Pmapsize;
        degkey = Pmapping[degkey];
        if(degkey < 0)
            return -1.0f;           //this key is not mapped

        //invert the keyboard upside-down if it is asked for
        //TODO: do the right way by using Pinvertupdowncenter
        if(Pinvertupdown != 0) {
            degkey = octavesize - degkey - 1;
            degoct = -degoct;
        }
        //compute the frequency of the note
        degkey  = degkey + scaleshift;
        degoct += degkey / octavesize;
        degkey %= octavesize;

        float freq = (degkey == 0) ? (1.0f) : octave[degkey - 1].tuning;
        freq *= powf(octave[octavesize - 1].tuning, degoct);
        freq *= PAfreq / rap_anote_middlenote;
        freq *= globalfinedetunerap;
        if(scaleshift)
            freq /= octave[scaleshift - 1].tuning;
        return freq * rap_keyshift;
    }
    else {  //if the mapping is disabled
        int nt    = note - PAnote + scaleshift;
        int ntkey = (nt + (int)octavesize * 100) % octavesize;
        int ntoct = (nt - ntkey) / octavesize;

        float oct  = octave[octavesize - 1].tuning;
        float freq =
            octave[(ntkey + octavesize - 1) % octavesize].tuning * powf(oct,
                                                                        ntoct)
            * PAfreq;
        if(!ntkey)
            freq /= oct;
        if(scaleshift)
            freq /= octave[scaleshift - 1].tuning;
        freq *= globalfinedetunerap;
        return freq * rap_keyshift;
    }
}

bool Microtonal::operator==(const Microtonal &micro) const
{
    return !(*this != micro);
}

bool Microtonal::operator!=(const Microtonal &micro) const
{
    //A simple macro to test equality MiCRotonal EQuals (not the perfect
    //approach, but good enough)
#define MCREQ(x) if(x != micro.x) \
        return true

    //for floats
#define FMCREQ(x) if(!((x < micro.x + 0.0001f) && (x > micro.x - 0.0001f))) \
        return true

    MCREQ(Pinvertupdown);
    MCREQ(Pinvertupdowncenter);
    MCREQ(octavesize);
    MCREQ(Penabled);
    MCREQ(PAnote);
    FMCREQ(PAfreq);
    MCREQ(Pscaleshift);

    MCREQ(Pfirstkey);
    MCREQ(Plastkey);
    MCREQ(Pmiddlenote);
    MCREQ(Pmapsize);
    MCREQ(Pmappingenabled);

    for(int i = 0; i < 128; ++i)
        MCREQ(Pmapping[i]);

    for(int i = 0; i < octavesize; ++i) {
        FMCREQ(octave[i].tuning);
        MCREQ(octave[i].type);
        MCREQ(octave[i].x1);
        MCREQ(octave[i].x2);
    }
    if(strcmp((const char *)this->Pname, (const char *)micro.Pname))
        return true;
    if(strcmp((const char *)this->Pcomment, (const char *)micro.Pcomment))
        return true;
    MCREQ(Pglobalfinedetune);
    return false;

    //undefine macros, as they are no longer needed
#undef MCREQ
#undef FMCREQ
}


/*
 * Convert a line to tunings; returns -1 if it ok
 */
int Microtonal::linetotunings(OctaveTuning &octave, const char *line)
{
    int   x1 = -1, x2 = -1, type = -1;
    float x  = -1.0f, tmp, tuning = 1.0f;
    if(strstr(line, "/") == NULL) {
        if(strstr(line, ".") == NULL) { // M case (M=M/1)
            sscanf(line, "%d", &x1);
            x2   = 1;
            type = 2; //division
        }
        else {  // float number case
            sscanf(line, "%f", &x);
            if(x < 0.000001f)
                return 1;
            type = 1; //float type(cents)
        }
    }
    else {  // M/N case
        sscanf(line, "%d/%d", &x1, &x2);
        if((x1 < 0) || (x2 < 0))
            return 1;
        if(x2 == 0)
            x2 = 1;
        type = 2; //division
    }

    if(x1 <= 0)
        x1 = 1;     //not allow zero frequency sounds (consider 0 as 1)

    //convert to float if the number are too big
    if((type == 2)
       && ((x1 > (128 * 128 * 128 - 1)) || (x2 > (128 * 128 * 128 - 1)))) {
        type = 1;
        x    = ((float) x1) / x2;
    }
    switch(type) {
        case 1:
            x1     = (int) floor(x);
            tmp    = fmod(x, 1.0f);
            x2     = (int) (floor(tmp * 1e6));
            tuning = powf(2.0f, x / 1200.0f);
            break;
        case 2:
            x      = ((float)x1) / x2;
            tuning = x;
            break;
    }

    octave.tuning = tuning;
    octave.type   = type;
    octave.x1     = x1;
    octave.x2     = x2;

    return -1; //ok
}

/*
 * Convert the text to tunnings
 */
int Microtonal::texttotunings(const char *text)
{
    unsigned int k = 0, nl = 0;
    char *lin = new char[MAX_LINE_SIZE + 1];
    OctaveTuning tmpoctave[MAX_OCTAVE_SIZE];
    while(k < strlen(text)) {
        int i;
        for(i = 0; i < MAX_LINE_SIZE; ++i) {
            lin[i] = text[k++];
            if(lin[i] < 0x20)
                break;
        }
        lin[i] = '\0';
        if(strlen(lin) == 0)
            continue;
        int err = linetotunings(tmpoctave[nl], lin);
        if(err != -1) {
            delete [] lin;
            return nl; //Parse error
        }
        nl++;
    }
    delete [] lin;
    if(nl > MAX_OCTAVE_SIZE)
        nl = MAX_OCTAVE_SIZE;
    if(nl == 0)
        return -2;        //the input is empty
    octavesize = nl;
    for(int i = 0; i < octavesize; ++i) {
        octave[i].tuning = tmpoctave[i].tuning;
        octave[i].type   = tmpoctave[i].type;
        octave[i].x1     = tmpoctave[i].x1;
        octave[i].x2     = tmpoctave[i].x2;
    }
    return -1; //ok
}

/*
 * Convert the text to mapping
 */
void Microtonal::texttomapping(const char *text)
{
    unsigned int i, k = 0;
    char *lin;
    lin = new char[MAX_LINE_SIZE + 1];
    for(i = 0; i < 128; ++i)
        Pmapping[i] = -1;
    int tx = 0;
    while(k < strlen(text)) {
        for(i = 0; i < MAX_LINE_SIZE; ++i) {
            lin[i] = text[k++];
            if(lin[i] < 0x20)
                break;
        }
        lin[i] = '\0';
        if(strlen(lin) == 0)
            continue;

        int tmp = 0;
        if(sscanf(lin, "%d", &tmp) == 0)
            tmp = -1;
        if(tmp < -1)
            tmp = -1;
        Pmapping[tx] = tmp;

        if((tx++) > 127)
            break;
    }
    delete [] lin;

    if(tx == 0)
        tx = 1;
    Pmapsize = tx;
}

/*
 * Convert tunning to text line
 */
void Microtonal::tuningtoline(int n, char *line, int maxn)
{
    if((n > octavesize) || (n > MAX_OCTAVE_SIZE)) {
        line[0] = '\0';
        return;
    }
    if(octave[n].type == 1)
        snprintf(line, maxn, "%d.%06d", octave[n].x1, octave[n].x2);
    if(octave[n].type == 2)
        snprintf(line, maxn, "%d/%d", octave[n].x1, octave[n].x2);
}


int Microtonal::loadline(FILE *file, char *line)
{
    memset(line, 0, 500);
    do {
        if(fgets(line, 500, file) == 0)
            return 1;
    } while(line[0] == '!');
    return 0;
}


/*
 * Loads the tunnings from a scl file
 */
int Microtonal::loadscl(SclInfo &scl, const char *filename)
{
    FILE *file = fopen(filename, "r");
    char  tmp[500];
    OctaveTuning tmpoctave[MAX_OCTAVE_SIZE];

    fseek(file, 0, SEEK_SET);

    //loads the short description
    if(loadline(file, &tmp[0]) != 0)
        return 2;

    for(int i = 0; i < 500; ++i)
        if(tmp[i] < 32)
            tmp[i] = 0;

    snprintf(scl.Pname,    MICROTONAL_MAX_NAME_LEN, "%s", tmp);
    snprintf(scl.Pcomment, MICROTONAL_MAX_NAME_LEN, "%s", tmp);

    //loads the number of the notes
    if(loadline(file, &tmp[0]) != 0)
        return 2;
    int nnotes = MAX_OCTAVE_SIZE;
    sscanf(&tmp[0], "%d", &nnotes);
    if(nnotes > MAX_OCTAVE_SIZE)
        return 2;

    //load the tunnings
    for(int nline = 0; nline < nnotes; ++nline) {
        if(loadline(file, &tmp[0]) != 0)
            return 2;
        linetotunings(tmpoctave[nline], tmp);
    }
    fclose(file);

    scl.octavesize = nnotes;
    for(int i = 0; i < scl.octavesize; ++i) {
        scl.octave[i].tuning = tmpoctave[i].tuning;
        scl.octave[i].type   = tmpoctave[i].type;
        scl.octave[i].x1     = tmpoctave[i].x1;
        scl.octave[i].x2     = tmpoctave[i].x2;
    }

    return 0;
}


/*
 * Loads the mapping from a kbm file
 */
int Microtonal::loadkbm(KbmInfo &kbm, const char *filename)
{
    FILE *file = fopen(filename, "r");
    int   x;
    float tmpPAfreq = 440.0f;
    char  tmp[500];

    fseek(file, 0, SEEK_SET);
    //loads the mapsize
    if(loadline(file, tmp) != 0 || sscanf(tmp, "%d", &x) == 0)
        return 2;
    kbm.Pmapsize = limit(x, 0, 127);

    //loads first MIDI note to retune
    if(loadline(file, tmp) != 0 || sscanf(tmp, "%d", &x) == 0)
        return 2;
    kbm.Pfirstkey = limit(x, 0, 127);

    //loads last MIDI note to retune
    if(loadline(file, tmp) != 0 || sscanf(tmp, "%d", &x) == 0)
        return 2;
    kbm.Plastkey = limit(x, 0, 127);

    //loads last the middle note where scale fro scale degree=0
    if(loadline(file, tmp) != 0 || sscanf(tmp, "%d", &x) == 0)
        return 2;
    kbm.Pmiddlenote = limit(x, 0, 127);

    //loads the reference note
    if(loadline(file, tmp) != 0 || sscanf(tmp, "%d", &x) == 0)
        return 2;
    kbm.PAnote = limit(x,0,127);

    //loads the reference freq.
    if(loadline(file, tmp) != 0 || sscanf(tmp, "%f", &tmpPAfreq) == 0)
        return 2;
    kbm.PAfreq = tmpPAfreq;

    //the scale degree(which is the octave) is not loaded,
    //it is obtained by the tunnings with getoctavesize() method
    if(loadline(file, &tmp[0]) != 0)
        return 2;

    //load the mappings
    if(kbm.Pmapsize != 0) {
        for(int nline = 0; nline < kbm.Pmapsize; ++nline) {
            if(loadline(file, tmp) != 0)
                return 2;
            if(sscanf(tmp, "%d", &x) == 0)
                x = -1;
            kbm.Pmapping[nline] = x;
        }
        kbm.Pmappingenabled = 1;
    }
    else {
        kbm.Pmappingenabled = 0;
        kbm.Pmapping[0]     = 0;
        kbm.Pmapsize = 1;
    }
    fclose(file);

    return 0;
}



void Microtonal::add2XML(XMLwrapper& xml) const
{
    xml.addparstr("name", (char *) Pname);
    xml.addparstr("comment", (char *) Pcomment);

    xml.addparbool("invert_up_down", Pinvertupdown);
    xml.addpar("invert_up_down_center", Pinvertupdowncenter);

    xml.addparbool("enabled", Penabled);
    xml.addpar("global_fine_detune", Pglobalfinedetune);

    xml.addpar("a_note", PAnote);
    xml.addparreal("a_freq", PAfreq);

    if((Penabled == 0) && (xml.minimal))
        return;

    xml.beginbranch("SCALE");
    xml.addpar("scale_shift", Pscaleshift);
    xml.addpar("first_key", Pfirstkey);
    xml.addpar("last_key", Plastkey);
    xml.addpar("middle_note", Pmiddlenote);

    xml.beginbranch("OCTAVE");
    xml.addpar("octave_size", octavesize);
    for(int i = 0; i < octavesize; ++i) {
        xml.beginbranch("DEGREE", i);
        if(octave[i].type == 1)
            xml.addparreal("cents", octave[i].tuning);
        ;
        if(octave[i].type == 2) {
            xml.addpar("numerator", octave[i].x1);
            xml.addpar("denominator", octave[i].x2);
        }
        xml.endbranch();
    }
    xml.endbranch();

    xml.beginbranch("KEYBOARD_MAPPING");
    xml.addpar("map_size", Pmapsize);
    xml.addpar("mapping_enabled", Pmappingenabled);
    for(int i = 0; i < Pmapsize; ++i) {
        xml.beginbranch("KEYMAP", i);
        xml.addpar("degree", Pmapping[i]);
        xml.endbranch();
    }

    xml.endbranch();
    xml.endbranch();
}

void Microtonal::getfromXML(XMLwrapper& xml)
{
    xml.getparstr("name", (char *) Pname, MICROTONAL_MAX_NAME_LEN);
    xml.getparstr("comment", (char *) Pcomment, MICROTONAL_MAX_NAME_LEN);

    Pinvertupdown = xml.getparbool("invert_up_down", Pinvertupdown);
    Pinvertupdowncenter = xml.getpar127("invert_up_down_center",
                                         Pinvertupdowncenter);

    Penabled = xml.getparbool("enabled", Penabled);
    Pglobalfinedetune = xml.getpar127("global_fine_detune", Pglobalfinedetune);

    PAnote = xml.getpar127("a_note", PAnote);
    PAfreq = xml.getparreal("a_freq", PAfreq, 1.0f, 10000.0f);

    if(xml.enterbranch("SCALE")) {
        Pscaleshift = xml.getpar127("scale_shift", Pscaleshift);
        Pfirstkey   = xml.getpar127("first_key", Pfirstkey);
        Plastkey    = xml.getpar127("last_key", Plastkey);
        Pmiddlenote = xml.getpar127("middle_note", Pmiddlenote);

        if(xml.enterbranch("OCTAVE")) {
            octavesize = xml.getpar127("octave_size", octavesize);
            for(int i = 0; i < octavesize; ++i) {
                if(xml.enterbranch("DEGREE", i) == 0)
                    continue;
                octave[i].x2     = 0;
                octave[i].tuning = xml.getparreal("cents", octave[i].tuning);
                octave[i].x1     = xml.getpar127("numerator", octave[i].x1);
                octave[i].x2     = xml.getpar127("denominator", octave[i].x2);

                if(octave[i].x2 != 0)
                    octave[i].type = 2;
                else {
                    octave[i].type = 1;
                    //populate fields for display
                    float x = logf(octave[i].tuning) / LOG_2 * 1200.0f;
                    octave[i].x1 = (int) floor(x);
                    octave[i].x2 = (int) (floor((x-octave[i].x1) * 1.0e6));
                }


                xml.exitbranch();
            }
            xml.exitbranch();
        }

        if(xml.enterbranch("KEYBOARD_MAPPING")) {
            Pmapsize = xml.getpar127("map_size", Pmapsize);
            Pmappingenabled = xml.getpar127("mapping_enabled", Pmappingenabled);
            for(int i = 0; i < Pmapsize; ++i) {
                if(xml.enterbranch("KEYMAP", i) == 0)
                    continue;
                Pmapping[i] = xml.getpar127("degree", Pmapping[i]);
                xml.exitbranch();
            }
            xml.exitbranch();
        }
        xml.exitbranch();
    }
    apply();
}



int Microtonal::saveXML(const char *filename) const
{
    XMLwrapper xml;

    xml.beginbranch("MICROTONAL");
    add2XML(xml);
    xml.endbranch();

    return xml.saveXMLfile(filename, gzip_compression);
}

int Microtonal::loadXML(const char *filename)
{
    XMLwrapper xml;
    if(xml.loadXMLfile(filename) < 0) {
        return -1;
    }

    if(xml.enterbranch("MICROTONAL") == 0)
        return -10;
    getfromXML(xml);
    xml.exitbranch();

    return 0;
}

//roundabout function, but it works
void Microtonal::apply(void)
{
    {
        char buf[100*MAX_OCTAVE_SIZE] = {0};
        char tmpbuf[100] = {0};
        for (int i=0;i<Pmapsize;i++) {
            if (i!=0)
                strncat(buf, "\n", sizeof(buf)-1);
            if (Pmapping[i]==-1)
                snprintf(tmpbuf,100,"x");
            else
                snprintf(tmpbuf,100,"%d",Pmapping[i]);
            strncat(buf, tmpbuf, sizeof(buf)-1);
        }
        texttomapping(buf);
    }

    {
        char buf[100*MAX_OCTAVE_SIZE] = {0};
        char tmpbuf[100] = {0};
        for (int i=0;i<getoctavesize();i++){
            if (i!=0)
                strncat(buf, "\n", sizeof(buf)-1);
            tuningtoline(i,tmpbuf,100);
            strncat(buf, tmpbuf, sizeof(buf)-1);
        }
        int err = texttotunings(buf);
    }
}