483 lines
18 KiB
C++
483 lines
18 KiB
C++
//=============================================================================
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// MuseScore
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// Music Composition & Notation
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//
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// Copyright (C) 2002-2011 Werner Schweer
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2
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// as published by the Free Software Foundation and appearing in
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// the file LICENCE.GPL
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//=============================================================================
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#include "stringdata.h"
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#include "chord.h"
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#include "note.h"
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#include "part.h"
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#include "score.h"
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#include "staff.h"
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#include "undo.h"
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#include "segment.h"
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namespace Ms {
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//---------------------------------------------------------
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// StringData
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//---------------------------------------------------------
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bool StringData::bFretting = false;
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StringData::StringData(int numFrets, int numStrings, int strings[])
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{
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instrString strg = { 0, false};
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_frets = numFrets;
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for (int i = 0; i < numStrings; i++) {
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strg.pitch = strings[i];
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stringTable.append(strg);
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}
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}
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StringData::StringData(int numFrets, QList<instrString>& strings)
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{
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_frets = numFrets;
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stringTable.clear();
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foreach(instrString i, strings)
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stringTable.append(i);
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}
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//---------------------------------------------------------
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// read
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//---------------------------------------------------------
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void StringData::read(XmlReader& e)
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{
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stringTable.clear();
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while (e.readNextStartElement()) {
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const QStringRef& tag(e.name());
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if (tag == "frets")
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_frets = e.readInt();
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else if (tag == "string") {
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instrString strg;
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strg.open = e.intAttribute("open", 0);
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strg.pitch = e.readInt();
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stringTable.append(strg);
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}
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else
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e.unknown();
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}
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}
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//---------------------------------------------------------
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// write
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//---------------------------------------------------------
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void StringData::write(XmlWriter& xml) const
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{
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xml.stag("StringData");
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xml.tag("frets", _frets);
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foreach(instrString strg, stringTable) {
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if (strg.open)
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xml.tag("string open=\"1\"", strg.pitch);
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else
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xml.tag("string", strg.pitch);
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}
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xml.etag();
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}
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//---------------------------------------------------------
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// convertPitch
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// Finds string and fret for a note.
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//
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// Fills *string and *fret with suitable values for pitch at given tick of given staff,
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// using the highest possible string.
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// If note cannot be fretted, uses fret 0 on nearest string and returns false
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//
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// Note: Strings are stored internally from lowest (0) to highest (strings()-1),
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// but the returned *string value references strings in reversed, 'visual', order:
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// from highest (0) to lowest (strings()-1)
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//---------------------------------------------------------
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bool StringData::convertPitch(int pitch, Staff* staff, int tick, int* string, int* fret) const
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{
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return convertPitch(pitch, pitchOffsetAt(staff, tick), string, fret);
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}
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//---------------------------------------------------------
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// getPitch
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// Returns the pitch corresponding to the string / fret combination
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// at given tick of given staff.
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// Returns INVALID_PITCH if not possible
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// Note: frets above max fret are accepted.
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//---------------------------------------------------------
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int StringData::getPitch(int string, int fret, Staff* staff, int tick) const
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{
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return getPitch(string, fret, pitchOffsetAt(staff, tick));
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}
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//---------------------------------------------------------
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// fret
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// Returns the fret corresponding to the pitch / string combination
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// at given tick of given staff.
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// Returns FRET_NONE if not possible
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//---------------------------------------------------------
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int StringData::fret(int pitch, int string, Staff* staff, int tick) const
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{
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return fret(pitch, string, pitchOffsetAt(staff, tick));
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}
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//---------------------------------------------------------
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// fretChords
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// Assigns fretting to all the notes of each chord in the same segment of chord
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// re-using existing fretting wherever possible
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//
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// Minimizes fret conflicts (multiple notes on the same string)
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// but marks as fretConflict notes which cannot be fretted
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// (outside tablature range) or which cannot be assigned
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// a separate string
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//---------------------------------------------------------
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void StringData::fretChords(Chord * chord) const
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{
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int nFret, minFret, maxFret, nNewFret, nTempFret;
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int nString, nNewString, nTempString;
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if(bFretting)
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return;
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bFretting = true;
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// we need to keep track of string allocation
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int bUsed[strings()]; // initially all strings are available
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for(nString=0; nString<strings(); nString++)
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bUsed[nString] = 0;
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// we also need the notes sorted in order of string (from highest to lowest) and then pitch
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QMap<int, Note *> sortedNotes;
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int count = 0;
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// store staff pitch offset at this tick, to speed up actual note pitch calculations
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// (ottavas not implemented yet)
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int transp = chord->staff() ? chord->part()->instrument()->transpose().chromatic : 0; // TODO: tick?
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int pitchOffset = /*chord->staff()->pitchOffset(chord->segment()->tick())*/ - transp;
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// if chord parent is not a segment, the chord is special (usually a grace chord):
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// fret it by itself, ignoring the segment
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if (chord->parent()->type() != ElementType::SEGMENT)
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sortChordNotes(sortedNotes, chord, pitchOffset, &count);
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else {
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// scan each chord of seg from same staff as 'chord', inserting each of its notes in sortedNotes
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Segment* seg = chord->segment();
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int trk;
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int trkFrom = (chord->track() / VOICES) * VOICES;
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int trkTo = trkFrom + VOICES;
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for(trk = trkFrom; trk < trkTo; ++trk) {
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Element* ch = seg->elist().at(trk);
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if (ch && ch->type() == ElementType::CHORD)
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sortChordNotes(sortedNotes, toChord(ch), pitchOffset, &count);
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}
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}
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// determine used range of frets
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minFret = INT32_MAX;
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maxFret = INT32_MIN;
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foreach(Note* note, sortedNotes) {
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if (note->string() != STRING_NONE)
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bUsed[note->string()]++;
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if (note->fret() != FRET_NONE && note->fret() < minFret)
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minFret = note->fret();
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if (note->fret() != FRET_NONE && note->fret() > maxFret)
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maxFret = note->fret();
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}
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// scan chord notes from highest, matching with strings from the highest
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foreach(Note * note, sortedNotes) {
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nString = nNewString = note->string();
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nFret = nNewFret = note->fret();
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note->setFretConflict(false); // assume no conflicts on this note
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// if no fretting (any invalid fretting has been erased by sortChordNotes() )
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if (nString == STRING_NONE /*|| nFret == FRET_NONE || getPitch(nString, nFret) != note->pitch()*/) {
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// get a new fretting
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if (!convertPitch(note->pitch(), pitchOffset, &nNewString, &nNewFret) ) {
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// no way to fit this note in this tab:
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// mark as fretting conflict
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note->setFretConflict(true);
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// store fretting change without affecting chord context
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if (nFret != nNewFret)
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note->undoChangeProperty(Pid::FRET, nNewFret);
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if (nString != nNewString)
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note->undoChangeProperty(Pid::STRING, nNewString);
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continue;
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}
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// note can be fretted: use string
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else {
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bUsed[nNewString]++;
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}
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}
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// if the note string (either original or newly assigned) is also used by another note
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if (bUsed[nNewString] > 1) {
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// attempt to find a suitable string, from topmost
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for (nTempString=0; nTempString < strings(); nTempString++) {
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if (bUsed[nTempString] < 1
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&& (nTempFret=fret(note->pitch(), nTempString, pitchOffset)) != FRET_NONE) {
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bUsed[nNewString]--; // free previous string
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bUsed[nTempString]++; // and occupy new string
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nNewFret = nTempFret;
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nNewString = nTempString;
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break;
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}
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}
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}
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// TODO : try to optimize used fret range, avoiding eccessively open positions
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// if fretting did change, store as a fret change
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if (nFret != nNewFret)
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note->undoChangeProperty(Pid::FRET, nNewFret);
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if (nString != nNewString)
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note->undoChangeProperty(Pid::STRING, nNewString);
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}
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// check for any remaining fret conflict
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foreach(Note * note, sortedNotes)
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if (bUsed[note->string()] > 1)
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note->setFretConflict(true);
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bFretting = false;
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}
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//********************
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// STATIC METHODS
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//********************
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//---------------------------------------------------------
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// pitchOffsetAt
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// Computes the pitch offset relevant for string data calculation at the given point.
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//
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// For string data calculations, pitch offset may depend on transposition, capos and, possibly, ottavas.
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//---------------------------------------------------------
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int StringData::pitchOffsetAt(Staff* staff, int /*tick*/)
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{
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int transp = staff ? staff->part()->instrument()->transpose().chromatic : 0; // TODO: tick?
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return (/*staff->pitchOffset(tick)*/ - transp);
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}
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//********************
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// PRIVATE METHODS
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//********************
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//---------------------------------------------------------
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// convertPitch
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// Finds string and fret for a note.
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//
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// Fills *string and *fret with suitable values for pitch / pitchOffset,
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// using the highest possible string.
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// If note cannot be fretted, uses fret 0 on nearest string and returns false
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//
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// Note: Strings are stored internally from lowest (0) to highest (strings()-1),
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// but the returned *string value references strings in reversed, 'visual', order:
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// from highest (0) to lowest (strings()-1)
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//---------------------------------------------------------
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bool StringData::convertPitch(int pitch, int pitchOffset, int* string, int* fret) const
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{
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int strings = stringTable.size();
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if (strings < 1)
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return false;
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pitch += pitchOffset;
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// if above max fret on highest string, fret on first string, but return failure
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if(pitch > stringTable.at(strings-1).pitch + _frets) {
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*string = 0;
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*fret = 0;
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return false;
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}
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// look for a suitable string, starting from the highest
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// NOTE: this assumes there are always enough frets to fill
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// the interval between any fretted string and the next
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for (int i = strings-1; i >=0; i--) {
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instrString strg = stringTable.at(i);
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if(pitch >= strg.pitch) {
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if (pitch == strg.pitch || !strg.open)
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*string = strings - i - 1;
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*fret = pitch - strg.pitch;
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return true;
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}
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}
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// if no string found, pitch is below lowest string:
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// fret on last string, but return failure
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*string = strings-1;
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*fret = 0;
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return false;
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}
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//---------------------------------------------------------
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// getPitch
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// Returns the pitch corresponding to the string / fret / pitchOffset combination.
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// Returns INVALID_PITCH if not possible
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// Note: frets above max fret are accepted.
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//---------------------------------------------------------
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int StringData::getPitch(int string, int fret, int pitchOffset) const
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{
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int strings = stringTable.size();
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if (string < 0 || string >= strings)
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return INVALID_PITCH;
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instrString strg = stringTable.at(strings - string - 1);
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return strg.pitch - pitchOffset + (strg.open ? 0 : fret);
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}
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//---------------------------------------------------------
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// fret
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// Returns the fret corresponding to the pitch / string / pitchOffset combination.
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// returns FRET_NONE if not possible
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//---------------------------------------------------------
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int StringData::fret(int pitch, int string, int pitchOffset) const
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{
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int strings = stringTable.size();
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if (strings < 1) // no strings at all!
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return FRET_NONE;
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if (string < 0 || string >= strings) // no such a string
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return FRET_NONE;
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pitch += pitchOffset;
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int fret = pitch - stringTable[strings - string - 1].pitch;
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// fret number is invalid or string cannot be fretted
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if (fret < 0 || fret >= _frets || (fret > 0 && stringTable[strings - string - 1].open))
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return FRET_NONE;
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return fret;
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}
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//---------------------------------------------------------
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// sortChordNotes
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// Adds to sortedNotes the notes of Chord in string/pitch order
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// Note: notes are sorted first by string (top string being 0),
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// then by negated pitch (higher pitches resulting in lower key),
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// then by order of submission to disambiguate notes with the same pitch.
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// Everything else being equal, this makes notes in higher-numbered voices
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// to be sorted after notes in lower-numbered voices (voice 2 after voice 1 and so on)
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// Notes without a string assigned yet, are sorted according to the lowest string which can accommodate them.
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//---------------------------------------------------------
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void StringData::sortChordNotes(QMap<int, Note *>& sortedNotes, const Chord *chord, int pitchOffset, int* count) const
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{
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int key, string, fret;
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foreach(Note * note, chord->notes()) {
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string = note->string();
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fret = note->fret();
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// if note not fretted yet or current fretting no longer valid,
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// use most convenient string as key
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if (string <= STRING_NONE || fret <= FRET_NONE
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|| getPitch(string, fret, pitchOffset) != note->pitch()) {
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note->setString(STRING_NONE);
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note->setFret(FRET_NONE);
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convertPitch(note->pitch(), pitchOffset, &string, &fret);
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}
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key = string * 100000;
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key += -(note->pitch()+pitchOffset) * 100 + *count; // disambiguate notes of equal pitch
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sortedNotes.insert(key, note);
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(*count)++;
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}
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}
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#if 0
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//---------------------------------------------------------
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// MusicXMLStepAltOct2Pitch
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//---------------------------------------------------------
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/**
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Convert MusicXML \a step / \a alter / \a octave to midi pitch.
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Note: similar to (part of) xmlSetPitch in mscore/importxml.cpp.
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TODO: combine ?
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*/
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static int MusicXMLStepAltOct2Pitch(char step, int alter, int octave)
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{
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int istep = step - 'A';
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// a b c d e f g
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static int table[7] = { 9, 11, 0, 2, 4, 5, 7 };
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if (istep < 0 || istep > 6) {
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qDebug("MusicXMLStepAltOct2Pitch: illegal step %d, <%c>", istep, step);
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return -1;
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}
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int pitch = table[istep] + alter + (octave+1) * 12;
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if (pitch < 0)
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pitch = -1;
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if (pitch > 127)
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pitch = -1;
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return pitch;
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}
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//---------------------------------------------------------
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// Read MusicXML
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//---------------------------------------------------------
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void StringData::readMusicXML(XmlReader& e)
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{
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_frets = 25;
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while (e.readNextStartElement()) {
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const QStringRef& tag(e.name());
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if (tag == "staff-lines") {
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int val = e.readInt();
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if (val > 0) {
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// resize the string table and init with zeroes
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stringTable = QVector<int>(val).toList();
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}
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else
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qDebug("StringData::readMusicXML: illegal staff-lines %d", val);
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}
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else if (tag == "staff-tuning") {
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int line = e.intAttribute("line");
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QString step;
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int alter = 0;
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int octave = 0;
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while (e.readNextStartElement()) {
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const QStringRef& tag(e.name());
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if (tag == "tuning-alter")
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alter = e.readInt();
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else if (tag == "tuning-octave")
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octave = e.readInt();
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else if (tag == "tuning-step")
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step = e.readElementText();
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else
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e.unknown();
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}
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if (0 < line && line <= stringTable.size()) {
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int pitch = MusicXMLStepAltOct2Pitch(step[0].toLatin1(), alter, octave);
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if (pitch >= 0)
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stringTable[line - 1] = pitch;
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else
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qDebug("StringData::readMusicXML invalid string %d tuning step/alter/oct %s/%d/%d",
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line, qPrintable(step), alter, octave);
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}
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}
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else if (tag == "capo") {
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; // not supported: silently ignored
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}
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else {
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; // others silently ignored
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}
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}
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}
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#endif
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//---------------------------------------------------------
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// Write MusicXML
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//---------------------------------------------------------
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void StringData::writeMusicXML(XmlWriter& /*xml*/) const
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{
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}
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}
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