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tablature.cpp
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// Copyright (C) 2025 by Brenton Bostick
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
// associated documentation files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial
// portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
// OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "tbt-parser.h"
#include "tbt-parser/tbt-parser-util.h"
#include "tbt-parser/tbt.h"
#include "rational/rational.h"
#undef NDEBUG
#include "common/abort.h"
#include "common/assert.h"
#include "common/logging.h"
#include "common/math_utils.h"
#include <map>
#define TAG "tablature"
const std::array<std::string, 12> MIDI_NOTE_TO_NAME_STRING = {
"C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B",
};
// Soft: (9)
// Slide up: /9
// Harmonic: <9>
// Slide down: \9
// Bend up: 9^
// Bend: b9
// Hammer on: h9
// Pull off: p9
// Release: r9
// Slap: s9
// Tap: t9
// Whammy bar bend: w9
// Tremolo: {9}
// Vibrato: 9~
const std::map<char, std::string> EFFECT_BEFORE = {
{ '\0', "" },
{ '(', "(" },
{ '/', "/" },
{ '<', "<" },
{ '\\', "\\" },
{ '^', "" },
{ 'b', "b" },
{ 'h', "h" },
{ 'p', "p" },
{ 'r', "r" },
{ 's', "s" },
{ 't', "t" },
{ 'w', "w" },
{ '{', "{" },
{ '~', "" },
};
const std::map<char, std::string> EFFECT_AFTER = {
{ '\0', "" },
{ '(', ")" },
{ '/', "" },
{ '<', ">" },
{ '\\', "" },
{ '^', "^" },
{ 'b', "" },
{ 'h', "" },
{ 'p', "" },
{ 'r', "" },
{ 's', "" },
{ 't', "" },
{ 'w', "" },
{ '{', "}" },
{ '~', "~" },
};
std::string trackEffectChangesString(const std::map<tbt_track_effect, uint16_t> &trackEffectChanges) {
ASSERT(!trackEffectChanges.empty());
if (2 <= trackEffectChanges.size()) {
return "+";
}
const auto &it = trackEffectChanges.begin();
auto effect = it->first;
switch (effect) {
case TE_STROKE_DOWN:
return "D";
case TE_STROKE_UP:
return "U";
case TE_TEMPO:
return "T";
case TE_INSTRUMENT:
return "I";
case TE_VOLUME:
return "V";
case TE_PAN:
return "P";
case TE_CHORUS:
return "C";
case TE_REVERB:
return "R";
case TE_MODULATION:
return "M";
case TE_PITCH_BEND:
return "B";
default:
ABORT("invalid effect: %d", effect);
}
}
std::string trackEffectString(uint8_t trackEffect) {
switch (trackEffect) {
case '\0':
return "";
case 'I': // Instrument change
return "I";
case 'V': // Volume change
return "V";
// NOLINTNEXTLINE(bugprone-branch-clone)
case 'T': // Tempo change
return "T";
case 't': // Tempo change + 250
return "T";
case 'D': // Stroke down
return "D";
case 'U': // Stroke up
return "U";
case 'C': // Chorus change
return "C";
case 'P': // Pan change
return "P";
case 'R': // Reverb change
return "R";
default:
ABORT("invalid trackEffect: %c (%d)", trackEffect, trackEffect);
}
}
//
// bars:
//
// 3 10 7
// [ I ] | I | ]
//
// if (0x70 <= VERSION), then bar lines are processed BEFORE the note
// else, then bar lines are processed AFTER the note
//
template <uint8_t STRINGS_PER_TRACK>
uint8_t
spaceWidthOfVsqs(const std::array<uint8_t, STRINGS_PER_TRACK + STRINGS_PER_TRACK + 4u> &vsqs, uint8_t stringCount) {
uint8_t spaceWidth = 1;
for (uint8_t string = 0; string < stringCount; string++) {
uint8_t noteWidth;
auto on = vsqs[string];
if (0x80 <= on) {
auto note = (on - 0x80);
noteWidth = width(note);
} else {
noteWidth = 1;
}
auto effect = static_cast<char>(vsqs[STRINGS_PER_TRACK + string]);
const auto &effectBeforeIt = EFFECT_BEFORE.find(effect);
auto &effectBefore = effectBeforeIt->second;
const auto &effectAfterIt = EFFECT_AFTER.find(effect);
auto &effectAfter = effectAfterIt->second;
spaceWidth = std::max(spaceWidth, static_cast<uint8_t>(effectBefore.size() + noteWidth + effectAfter.size()));
}
return spaceWidth;
}
template <uint8_t VERSION, bool HASALTERNATETIMEREGIONS, uint8_t STRINGS_PER_TRACK, typename tbt_file_t>
std::string
TtbtFileTablature(const tbt_file_t &t) {
uint16_t barLinesSpaceCount;
if constexpr (0x70 <= VERSION) {
barLinesSpaceCount = t.body.barLinesSpaceCount;
} else if constexpr (VERSION == 0x6f) {
barLinesSpaceCount = t.header.spaceCount;
} else {
barLinesSpaceCount = 4000;
}
//
// first compute widths
//
uint8_t tuningWidth = 1;
//
// if not present, then assume 1
//
// must check if present in barLinesMap first
//
std::map<uint16_t, uint8_t> barLineWidthMap;
//
// if not present, then assume 1
//
std::map<uint16_t, uint8_t> actualSpaceWidthMap;
//
// compute bar line widths
//
{
//
// make a copy to modify
//
auto barLinesMap = t.body.barLinesMap;
//
// setup last bar lines
//
if constexpr (0x70 <= VERSION) {
//
// setup last bar line
//
barLinesMap[barLinesSpaceCount] = { 0, 0 };
} else {
//
// setup last bar line
//
if (barLinesMap.find(barLinesSpaceCount - 1) == barLinesMap.end()) {
barLinesMap[barLinesSpaceCount - 1] = { 0b00000001 };
}
}
bool savedClose = false;
uint8_t savedRepeats = 0;
for (uint16_t space = 0; space < barLinesSpaceCount;) {
const auto &barLinesMapIt = barLinesMap.find(space);
//
// bar line
//
// both bar lines before notes and bar lines after notes are processed at the same time
//
if (barLinesMapIt != barLinesMap.end()) {
if constexpr (0x70 <= VERSION) {
auto barLine = barLinesMapIt->second;
if (savedClose) {
auto w = width(savedRepeats);
if (w != 1) {
barLineWidthMap[space] = w;
}
savedClose = false;
}
if ((barLine[0] & CLOSEREPEAT_MASK_GE70) == CLOSEREPEAT_MASK_GE70) {
//
// save for next bar line
//
savedClose = true;
savedRepeats = barLine[1];
}
} else {
auto barLine = barLinesMapIt->second;
auto change = static_cast<tbt_bar_line>(barLine[0] & 0b00001111);
switch (change) {
case CLOSE: {
auto repeats = static_cast<uint8_t>((barLine[0] & 0b11110000) >> 4);
auto w = width(repeats);
if (w != 1) {
barLineWidthMap[space] = w;
}
break;
}
case OPEN:
case SINGLE:
case DOUBLE: {
break;
}
default:
ABORT("invalid change: %d", change);
}
}
barLinesMap.erase(barLinesMapIt);
}
space++;
}
//
// last bar line
//
{
const auto &barLinesMapIt = barLinesMap.find(barLinesSpaceCount);
if (barLinesMapIt != barLinesMap.end()) {
if constexpr (0x70 <= VERSION) {
auto barLine = barLinesMapIt->second;
if (savedClose) {
auto w = width(savedRepeats);
if (w != 1) {
barLineWidthMap[barLinesSpaceCount] = w;
}
savedClose = false;
}
if ((barLine[0] & CLOSEREPEAT_MASK_GE70) == CLOSEREPEAT_MASK_GE70) {
//
// save for next bar line
//
savedClose = true;
savedRepeats = barLine[1];
}
} else {
auto barLine = barLinesMapIt->second;
auto change = static_cast<tbt_bar_line>(barLine[0] & 0b00001111);
switch (change) {
case CLOSE: {
auto repeats = static_cast<uint8_t>((barLine[0] & 0b11110000) >> 4);
auto w = width(repeats);
if (w != 1) {
barLineWidthMap[barLinesSpaceCount] = w;
}
break;
}
case OPEN:
case SINGLE:
case DOUBLE: {
break;
}
default:
ABORT("invalid change: %d", change);
}
}
barLinesMap.erase(barLinesMapIt);
}
}
ASSERT(barLinesMap.empty());
} // compute bar line widths
//
// compute tuningWidth and spaces widths
//
for (uint8_t track = 0; track < t.header.trackCount; track++) {
const auto &trackMetadata = t.metadata.tracks[track];
const auto &maps = t.body.mapsList[track];
uint16_t trackSpaceCount;
if constexpr (0x70 <= VERSION) {
//
// stored as 32-bit int, so must be cast
//
trackSpaceCount = static_cast<uint16_t>(t.metadata.tracks[track].spaceCount);
} else if constexpr (VERSION == 0x6f) {
trackSpaceCount = t.header.spaceCount;
} else {
trackSpaceCount = 4000;
}
for (uint8_t string = 0; string < trackMetadata.stringCount; string++) {
int8_t note;
if constexpr (0x6b <= VERSION) {
note = OPEN_STRING_TO_MIDI_NOTE[string];
} else {
note = OPEN_STRING_TO_MIDI_NOTE_LE6A[string];
}
note += trackMetadata.tuning[string];
if constexpr (0x6e <= VERSION) {
note += (trackMetadata.transposeHalfSteps);
}
uint8_t noteWidth;
if constexpr (0x6e <= VERSION) {
if (trackMetadata.displayMIDINoteNumbers) {
noteWidth = width(note);
} else {
const auto ¬eStr = MIDI_NOTE_TO_NAME_STRING[static_cast<uint8_t>(euclidean_mod(note, 12))];
noteWidth = static_cast<uint8_t>(noteStr.size());
}
} else {
const auto ¬eStr = MIDI_NOTE_TO_NAME_STRING[static_cast<uint8_t>(euclidean_mod(note, 12))];
noteWidth = static_cast<uint8_t>(noteStr.size());
}
tuningWidth = std::max(tuningWidth, noteWidth);
}
rational actualSpace = 0;
rational flooredActualSpace = 0;
uint16_t flooredActualSpaceI = 0;
uint16_t prevFlooredActualSpaceI = 0;
//
// accumulate through an entire actual space
//
uint8_t spaceWidthAcc = 0;
for (uint16_t space = 0; space < trackSpaceCount;) {
//
// compute spaceWidth
//
const auto ¬esMapIt = maps.notesMap.find(space);
if (notesMapIt != maps.notesMap.end()) {
const auto &vsqs = notesMapIt->second;
auto spaceWidth = spaceWidthOfVsqs<STRINGS_PER_TRACK>(vsqs, trackMetadata.stringCount);
spaceWidthAcc += spaceWidth;
} else {
spaceWidthAcc += 1;
}
//
// Compute actual space
//
if constexpr (HASALTERNATETIMEREGIONS) {
const auto &alternateTimeRegionsIt = maps.alternateTimeRegionsMap.find(space);
if (alternateTimeRegionsIt != maps.alternateTimeRegionsMap.end()) {
const auto &alternateTimeRegion = alternateTimeRegionsIt->second;
auto atr = rational{ alternateTimeRegion[0], alternateTimeRegion[1] };
space++;
actualSpace += atr;
} else {
space++;
++actualSpace;
}
flooredActualSpace = actualSpace.floor();
prevFlooredActualSpaceI = flooredActualSpaceI;
flooredActualSpaceI = flooredActualSpace.to_uint16();
} else {
space++;
actualSpace = space;
flooredActualSpace = space;
prevFlooredActualSpaceI = flooredActualSpaceI;
flooredActualSpaceI = space;
}
//
// increase actualSpaceWidth if needed
//
if (flooredActualSpaceI != prevFlooredActualSpaceI) {
ASSERT(spaceWidthAcc != 0);
if (spaceWidthAcc != 1) {
const auto &it = actualSpaceWidthMap.find(prevFlooredActualSpaceI);
if (it != actualSpaceWidthMap.end()) {
auto &actualSpaceWidth = it->second;
actualSpaceWidth = std::max(actualSpaceWidth, spaceWidthAcc);
} else {
actualSpaceWidthMap[prevFlooredActualSpaceI] = spaceWidthAcc;
}
}
spaceWidthAcc = 0;
}
} // space
} // compute tuningWidth and spaces widths
//
// compute totalWidth
//
size_t totalWidth;
{
totalWidth = 0;
totalWidth += tuningWidth;
//
// make a copy to modify
//
auto barLinesMap = t.body.barLinesMap;
//
// setup last bar lines
//
if constexpr (0x70 <= VERSION) {
//
// setup last bar line
//
barLinesMap[barLinesSpaceCount] = { 0, 0 };
} else {
//
// setup last bar line
//
if (barLinesMap.find(barLinesSpaceCount - 1) == barLinesMap.end()) {
barLinesMap[barLinesSpaceCount - 1] = { 0b00000001 };
}
}
if constexpr (0x70 <= VERSION) {
} else {
//
// hard-coded first bar line
//
totalWidth += 1;
}
for (uint16_t space = 0; space < barLinesSpaceCount;) {
const auto &barLinesMapIt = barLinesMap.find(space);
if (barLinesMapIt != barLinesMap.end()) {
const auto &barLineWidthMapIt = barLineWidthMap.find(space);
if (barLineWidthMapIt != barLineWidthMap.end()) {
auto barLineWidth = barLineWidthMapIt->second;
totalWidth += barLineWidth;
} else {
totalWidth += 1;
}
}
const auto &actualSpaceWidthMapIt = actualSpaceWidthMap.find(space);
if (actualSpaceWidthMapIt != actualSpaceWidthMap.end()) {
auto spaceWidth = actualSpaceWidthMapIt->second;
totalWidth += spaceWidth;
} else {
totalWidth += 1;
}
space++;
}
//
// last bar line
//
{
const auto &barLinesMapIt = barLinesMap.find(barLinesSpaceCount);
if (barLinesMapIt != barLinesMap.end()) {
const auto &barLineWidthMapIt = barLineWidthMap.find(barLinesSpaceCount);
if (barLineWidthMapIt != barLineWidthMap.end()) {
auto barLineWidth = barLineWidthMapIt->second;
totalWidth += barLineWidth;
} else {
totalWidth += 1;
}
}
}
}
//
// the thing to return at the end
//
std::string acc;
auto info = tbtFileInfo(t);
acc += info;
acc += '\n';
//
// for each track:
// render:
// top line text
// repeats count
// for each string:
// render:
// tuning, bar lines and notes
// track effect changes
// bottom line text
//
for (uint8_t track = 0; track < t.header.trackCount; track++) {
const auto &trackMetadata = t.metadata.tracks[track];
//
// make a copy to modify
//
auto barLinesMap = t.body.barLinesMap;
const auto &maps = t.body.mapsList[track];
uint16_t trackSpaceCount;
if constexpr (0x70 <= VERSION) {
//
// stored as 32-bit int, so must be cast
//
trackSpaceCount = static_cast<uint16_t>(t.metadata.tracks[track].spaceCount);
} else if constexpr (VERSION == 0x6f) {
trackSpaceCount = t.header.spaceCount;
} else {
trackSpaceCount = 4000;
}
std::string topLineText;
std::string repeatsCount;
std::vector<std::string> notesAndBarLines{ trackMetadata.stringCount };
std::string trackEffectChanges;
std::string bottomLineText;
std::string debugText;
if (trackMetadata.topLineText) {
topLineText.reserve(totalWidth);
}
repeatsCount.reserve(totalWidth);
for (uint8_t string = 0; string < trackMetadata.stringCount; string++) {
notesAndBarLines[string].reserve(totalWidth);
}
trackEffectChanges.reserve(totalWidth);
if (trackMetadata.bottomLineText) {
bottomLineText.reserve(totalWidth);
}
debugText.reserve(totalWidth);
//
// render tuning
//
{
if (trackMetadata.topLineText) {
topLineText.append(tuningWidth, ' ');
}
repeatsCount.append(tuningWidth, ' ');
for (uint8_t string = 0; string < trackMetadata.stringCount; string++) {
int8_t note;
if constexpr (0x6b <= VERSION) {
note = OPEN_STRING_TO_MIDI_NOTE[string];
} else {
note = OPEN_STRING_TO_MIDI_NOTE_LE6A[string];
}
note += trackMetadata.tuning[string];
if constexpr (0x6e <= VERSION) {
note += (trackMetadata.transposeHalfSteps);
}
uint8_t noteWidth;
if constexpr (0x6e <= VERSION) {
if (trackMetadata.displayMIDINoteNumbers) {
auto noteStr = std::to_string(note);
notesAndBarLines[string] += noteStr;
noteWidth = static_cast<uint8_t>(noteStr.size());
} else {
const auto ¬eStr = MIDI_NOTE_TO_NAME_STRING[static_cast<uint8_t>(euclidean_mod(note, 12))];
notesAndBarLines[string] += noteStr;
noteWidth = static_cast<uint8_t>(noteStr.size());
}
} else {
const auto ¬eStr = MIDI_NOTE_TO_NAME_STRING[static_cast<uint8_t>(euclidean_mod(note, 12))];
notesAndBarLines[string] += noteStr;
noteWidth = static_cast<uint8_t>(noteStr.size());
}
notesAndBarLines[string].append(tuningWidth - noteWidth, ' ');
}
trackEffectChanges.append(tuningWidth, ' ');
if (trackMetadata.bottomLineText) {
bottomLineText.append(tuningWidth, ' ');
}
debugText += static_cast<char>(tuningWidth + '0');
debugText.append(tuningWidth - 1, ' ');
}
//
// setup last bar lines
// render first bar line
//
if constexpr (0x70 <= VERSION) {
//
// setup last bar line
//
barLinesMap[barLinesSpaceCount] = { 0, 0 };
} else {
//
// render first bar line
//
// just hard code this here
//
{
//
// top line text for bar line
//
if (trackMetadata.topLineText) {
topLineText += ' ';
}
//
// repeats count for bar line
//
repeatsCount += ' ';
//
// bar line
//
for (uint8_t string = 0; string < trackMetadata.stringCount; string++) {
notesAndBarLines[string] += '|';
}
//
// track effect changes for bar line
//
trackEffectChanges += ' ';
//
// bottom line text for bar line
//
if (trackMetadata.bottomLineText) {
bottomLineText += ' ';
}
debugText += static_cast<char>(1 + '0');
}
//
// setup last bar line
//
if (barLinesMap.find(barLinesSpaceCount - 1) == barLinesMap.end()) {
barLinesMap[barLinesSpaceCount - 1] = { 0b00000001 };
}
}
rational actualSpace = 0;
rational flooredActualSpace = 0;
uint16_t flooredActualSpaceI = 0;
uint16_t prevFlooredActualSpaceI = 0;
//
// accumulate through an entire actual space
//
uint8_t topLineTextWidthAcc = 0;
uint8_t repeatsCountWidthAcc = 0;
std::array<uint8_t, STRINGS_PER_TRACK> notesAndBarLinesWidthAcc{};
uint8_t trackEffectChangesWidthAcc = 0;
uint8_t bottomLineTextWidthAcc = 0;
uint8_t debugTextWidthAcc = 0;
auto fillin = [&](uint8_t width) {
if (trackMetadata.topLineText) {
topLineText.append(width - topLineTextWidthAcc, ' ');
topLineTextWidthAcc = 0;
}
{
repeatsCount.append(width - repeatsCountWidthAcc, ' ');
repeatsCountWidthAcc = 0;
}
for (uint8_t string = 0; string < trackMetadata.stringCount; string++) {
notesAndBarLines[string].append(width - notesAndBarLinesWidthAcc[string], '-');
notesAndBarLinesWidthAcc[string] = 0;
}
{
trackEffectChanges.append(width - trackEffectChangesWidthAcc, ' ');
trackEffectChangesWidthAcc = 0;
}
if (trackMetadata.bottomLineText) {
bottomLineText.append(width - bottomLineTextWidthAcc, ' ');
bottomLineTextWidthAcc = 0;
}
debugText.append(width - debugTextWidthAcc, ' ');
debugTextWidthAcc = 0;
};
bool savedClose = false;
uint8_t savedRepeats = 0;
for (uint16_t space = 0; space < trackSpaceCount;) {
const auto &barLinesMapIt = barLinesMap.find(flooredActualSpaceI);
const auto ¬esMapIt = maps.notesMap.find(space);
const auto &actualSpaceWidthMapIt = actualSpaceWidthMap.find(flooredActualSpaceI);
const auto &barLineWidthMapIt = barLineWidthMap.find(flooredActualSpaceI);
uint8_t spaceWidth;
if (actualSpaceWidthMapIt != actualSpaceWidthMap.end()) {
spaceWidth = actualSpaceWidthMapIt->second;
} else {
spaceWidth = 1;
}