tumbledemerald-legacy/tools/mid2agb/midi.cpp

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2022-05-19 19:14:13 +02:00
// Copyright(c) 2016 YamaArashi
//
// 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 <cstdio>
#include <cassert>
#include <string>
#include <vector>
#include <algorithm>
#include <memory>
#include "midi.h"
#include "main.h"
#include "error.h"
#include "agb.h"
#include "tables.h"
enum class MidiEventCategory
{
Control,
SysEx,
Meta,
Invalid,
};
MidiFormat g_midiFormat;
std::int_fast32_t g_midiTrackCount;
std::int16_t g_midiTimeDiv;
int g_midiChan;
std::int32_t g_initialWait;
static long s_trackDataStart;
static std::vector<Event> s_seqEvents;
static std::vector<Event> s_trackEvents;
static std::int32_t s_absoluteTime;
static int s_blockCount = 0;
static int s_minNote;
static int s_maxNote;
static int s_runningStatus;
void Seek(long offset)
{
if (std::fseek(g_inputFile, offset, SEEK_SET) != 0)
RaiseError("failed to seek to %l", offset);
}
void Skip(long offset)
{
if (std::fseek(g_inputFile, offset, SEEK_CUR) != 0)
RaiseError("failed to skip %l bytes", offset);
}
std::string ReadSignature()
{
char signature[4];
if (std::fread(signature, 4, 1, g_inputFile) != 1)
RaiseError("failed to read signature");
return std::string(signature, 4);
}
std::uint32_t ReadInt8()
{
int c = std::fgetc(g_inputFile);
if (c < 0)
RaiseError("unexpected EOF");
return c;
}
std::uint32_t ReadInt16()
{
std::uint32_t val = 0;
val |= ReadInt8() << 8;
val |= ReadInt8();
return val;
}
std::uint32_t ReadInt24()
{
std::uint32_t val = 0;
val |= ReadInt8() << 16;
val |= ReadInt8() << 8;
val |= ReadInt8();
return val;
}
std::uint32_t ReadInt32()
{
std::uint32_t val = 0;
val |= ReadInt8() << 24;
val |= ReadInt8() << 16;
val |= ReadInt8() << 8;
val |= ReadInt8();
return val;
}
std::uint32_t ReadVLQ()
{
std::uint32_t val = 0;
std::uint32_t c;
do
{
c = ReadInt8();
val <<= 7;
val |= (c & 0x7F);
} while (c & 0x80);
return val;
}
void ReadMidiFileHeader()
{
Seek(0);
if (ReadSignature() != "MThd")
RaiseError("MIDI file header signature didn't match \"MThd\"");
std::uint32_t headerLength = ReadInt32();
if (headerLength != 6)
RaiseError("MIDI file header length isn't 6");
std::uint16_t midiFormat = ReadInt16();
if (midiFormat >= 2)
RaiseError("unsupported MIDI format (%u)", midiFormat);
g_midiFormat = (MidiFormat)midiFormat;
g_midiTrackCount = ReadInt16();
g_midiTimeDiv = ReadInt16();
if (g_midiTimeDiv < 0)
RaiseError("unsupported MIDI time division (%d)", g_midiTimeDiv);
}
long ReadMidiTrackHeader(long offset)
{
Seek(offset);
if (ReadSignature() != "MTrk")
RaiseError("MIDI track header signature didn't match \"MTrk\"");
long size = ReadInt32();
s_trackDataStart = std::ftell(g_inputFile);
return size + 8;
}
void StartTrack()
{
Seek(s_trackDataStart);
s_absoluteTime = 0;
s_runningStatus = 0;
}
void SkipEventData()
{
Skip(ReadVLQ());
}
void DetermineEventCategory(MidiEventCategory& category, int& typeChan, int& size)
{
typeChan = ReadInt8();
if (typeChan < 0x80)
{
// If data byte was found, use the running status.
ungetc(typeChan, g_inputFile);
typeChan = s_runningStatus;
}
if (typeChan == 0xFF)
{
category = MidiEventCategory::Meta;
size = 0;
s_runningStatus = 0;
}
else if (typeChan >= 0xF0)
{
category = MidiEventCategory::SysEx;
size = 0;
s_runningStatus = 0;
}
else if (typeChan >= 0x80)
{
category = MidiEventCategory::Control;
switch (typeChan >> 4)
{
case 0xC:
case 0xD:
size = 1;
break;
default:
size = 2;
break;
}
s_runningStatus = typeChan;
}
else
{
category = MidiEventCategory::Invalid;
}
}
void MakeBlockEvent(Event& event, EventType type)
{
event.type = type;
event.param1 = s_blockCount++;
event.param2 = 0;
}
std::string ReadEventText()
{
char buffer[2];
std::uint32_t length = ReadVLQ();
if (length <= 2)
{
if (fread(buffer, length, 1, g_inputFile) != 1)
RaiseError("failed to read event text");
}
else
{
Skip(length);
length = 0;
}
return std::string(buffer, length);
}
bool ReadSeqEvent(Event& event)
{
s_absoluteTime += ReadVLQ();
event.time = s_absoluteTime;
MidiEventCategory category;
int typeChan;
int size;
DetermineEventCategory(category, typeChan, size);
if (category == MidiEventCategory::Control)
{
Skip(size);
return false;
}
if (category == MidiEventCategory::SysEx)
{
SkipEventData();
return false;
}
if (category == MidiEventCategory::Invalid)
RaiseError("invalid event");
// meta event
int metaEventType = ReadInt8();
if (metaEventType >= 1 && metaEventType <= 7)
{
// text event
std::string text = ReadEventText();
if (text == "[")
MakeBlockEvent(event, EventType::LoopBegin);
else if (text == "][")
MakeBlockEvent(event, EventType::LoopEndBegin);
else if (text == "]")
MakeBlockEvent(event, EventType::LoopEnd);
else if (text == ":")
MakeBlockEvent(event, EventType::Label);
else
return false;
}
else
{
switch (metaEventType)
{
case 0x2F: // end of track
SkipEventData();
event.type = EventType::EndOfTrack;
event.param1 = 0;
event.param2 = 0;
break;
case 0x51: // tempo
if (ReadVLQ() != 3)
RaiseError("invalid tempo size");
event.type = EventType::Tempo;
event.param1 = 0;
event.param2 = ReadInt24();
break;
case 0x58: // time signature
{
if (ReadVLQ() != 4)
RaiseError("invalid time signature size");
int numerator = ReadInt8();
int denominatorExponent = ReadInt8();
if (denominatorExponent >= 16)
RaiseError("invalid time signature denominator");
Skip(2); // ignore other values
int clockTicks = 96 * numerator * g_clocksPerBeat;
int denominator = 1 << denominatorExponent;
int timeSig = clockTicks / denominator;
if (timeSig <= 0 || timeSig >= 0x10000)
RaiseError("invalid time signature");
event.type = EventType::TimeSignature;
event.param1 = 0;
event.param2 = timeSig;
break;
}
default:
SkipEventData();
return false;
}
}
return true;
}
void ReadSeqEvents()
{
StartTrack();
for (;;)
{
Event event = {};
if (ReadSeqEvent(event))
{
s_seqEvents.push_back(event);
if (event.type == EventType::EndOfTrack)
return;
}
}
}
bool CheckNoteEnd(Event& event)
{
event.param2 += ReadVLQ();
MidiEventCategory category;
int typeChan;
int size;
DetermineEventCategory(category, typeChan, size);
if (category == MidiEventCategory::Control)
{
int chan = typeChan & 0xF;
if (chan != g_midiChan)
{
Skip(size);
return false;
}
switch (typeChan & 0xF0)
{
case 0x80: // note off
{
int note = ReadInt8();
ReadInt8(); // ignore velocity
if (note == event.note)
return true;
break;
}
case 0x90: // note on
{
int note = ReadInt8();
int velocity = ReadInt8();
if (velocity == 0 && note == event.note)
return true;
break;
}
default:
Skip(size);
break;
}
return false;
}
if (category == MidiEventCategory::SysEx)
{
SkipEventData();
return false;
}
if (category == MidiEventCategory::Meta)
{
int metaEventType = ReadInt8();
SkipEventData();
if (metaEventType == 0x2F)
RaiseError("note doesn't end");
return false;
}
RaiseError("invalid event");
}
void FindNoteEnd(Event& event)
{
// Save the current file position and running status
// which get modified by CheckNoteEnd.
long startPos = ftell(g_inputFile);
int savedRunningStatus = s_runningStatus;
event.param2 = 0;
while (!CheckNoteEnd(event))
;
Seek(startPos);
s_runningStatus = savedRunningStatus;
}
bool ReadTrackEvent(Event& event)
{
s_absoluteTime += ReadVLQ();
event.time = s_absoluteTime;
MidiEventCategory category;
int typeChan;
int size;
DetermineEventCategory(category, typeChan, size);
if (category == MidiEventCategory::Control)
{
int chan = typeChan & 0xF;
if (chan != g_midiChan)
{
Skip(size);
return false;
}
switch (typeChan & 0xF0)
{
case 0x90: // note on
{
int note = ReadInt8();
int velocity = ReadInt8();
if (velocity != 0)
{
event.type = EventType::Note;
event.note = note;
event.param1 = velocity;
FindNoteEnd(event);
if (event.param2 > 0)
{
if (note < s_minNote)
s_minNote = note;
if (note > s_maxNote)
s_maxNote = note;
}
}
break;
}
case 0xB0: // controller event
event.type = EventType::Controller;
event.param1 = ReadInt8(); // controller index
event.param2 = ReadInt8(); // value
break;
case 0xC0: // instrument change
event.type = EventType::InstrumentChange;
event.param1 = ReadInt8(); // instrument
event.param2 = 0;
break;
case 0xE0: // pitch bend
event.type = EventType::PitchBend;
event.param1 = ReadInt8();
event.param2 = ReadInt8();
break;
default:
Skip(size);
return false;
}
return true;
}
if (category == MidiEventCategory::SysEx)
{
SkipEventData();
return false;
}
if (category == MidiEventCategory::Meta)
{
int metaEventType = ReadInt8();
SkipEventData();
if (metaEventType == 0x2F)
{
event.type = EventType::EndOfTrack;
event.param1 = 0;
event.param2 = 0;
return true;
}
return false;
}
RaiseError("invalid event");
}
void ReadTrackEvents()
{
StartTrack();
s_trackEvents.clear();
s_minNote = 0xFF;
s_maxNote = 0;
for (;;)
{
Event event = {};
if (ReadTrackEvent(event))
{
s_trackEvents.push_back(event);
if (event.type == EventType::EndOfTrack)
return;
}
}
}
bool EventCompare(const Event& event1, const Event& event2)
{
if (event1.time < event2.time)
return true;
if (event1.time > event2.time)
return false;
unsigned event1Type = (unsigned)event1.type;
unsigned event2Type = (unsigned)event2.type;
if (event1.type == EventType::Note)
event1Type += event1.note;
if (event2.type == EventType::Note)
event2Type += event2.note;
if (event1Type < event2Type)
return true;
if (event1Type > event2Type)
return false;
if (event1.type == EventType::EndOfTie)
{
if (event1.note < event2.note)
return true;
if (event1.note > event2.note)
return false;
}
return false;
}
std::unique_ptr<std::vector<Event>> MergeEvents()
{
std::unique_ptr<std::vector<Event>> events(new std::vector<Event>());
unsigned trackEventPos = 0;
unsigned seqEventPos = 0;
while (s_trackEvents[trackEventPos].type != EventType::EndOfTrack
&& s_seqEvents[seqEventPos].type != EventType::EndOfTrack)
{
if (EventCompare(s_trackEvents[trackEventPos], s_seqEvents[seqEventPos]))
events->push_back(s_trackEvents[trackEventPos++]);
else
events->push_back(s_seqEvents[seqEventPos++]);
}
while (s_trackEvents[trackEventPos].type != EventType::EndOfTrack)
events->push_back(s_trackEvents[trackEventPos++]);
while (s_seqEvents[seqEventPos].type != EventType::EndOfTrack)
events->push_back(s_seqEvents[seqEventPos++]);
// Push the EndOfTrack event with the larger time.
if (EventCompare(s_trackEvents[trackEventPos], s_seqEvents[seqEventPos]))
events->push_back(s_seqEvents[seqEventPos]);
else
events->push_back(s_trackEvents[trackEventPos]);
return events;
}
void ConvertTimes(std::vector<Event>& events)
{
for (Event& event : events)
{
event.time = (24 * g_clocksPerBeat * event.time) / g_midiTimeDiv;
if (event.type == EventType::Note)
{
event.param1 = g_noteVelocityLUT[event.param1];
std::uint32_t duration = (24 * g_clocksPerBeat * event.param2) / g_midiTimeDiv;
if (duration == 0)
duration = 1;
if (!g_exactGateTime && duration < 96)
duration = g_noteDurationLUT[duration];
event.param2 = duration;
}
}
}
std::unique_ptr<std::vector<Event>> InsertTimingEvents(std::vector<Event>& inEvents)
{
std::unique_ptr<std::vector<Event>> outEvents(new std::vector<Event>());
Event timingEvent = {};
timingEvent.time = 0;
timingEvent.type = EventType::TimeSignature;
timingEvent.param2 = 96 * g_clocksPerBeat;
for (const Event& event : inEvents)
{
while (EventCompare(timingEvent, event))
{
outEvents->push_back(timingEvent);
timingEvent.time += timingEvent.param2;
}
if (event.type == EventType::TimeSignature)
{
if (g_agbTrack == 1 && event.param2 != timingEvent.param2)
{
Event originalTimingEvent = event;
originalTimingEvent.type = EventType::OriginalTimeSignature;
outEvents->push_back(originalTimingEvent);
}
timingEvent.param2 = event.param2;
timingEvent.time = event.time + timingEvent.param2;
}
outEvents->push_back(event);
}
return outEvents;
}
std::unique_ptr<std::vector<Event>> SplitTime(std::vector<Event>& inEvents)
{
std::unique_ptr<std::vector<Event>> outEvents(new std::vector<Event>());
std::int32_t time = 0;
for (const Event& event : inEvents)
{
std::int32_t diff = event.time - time;
if (diff > 96)
{
int wholeNoteCount = (diff - 1) / 96;
diff -= 96 * wholeNoteCount;
for (int i = 0; i < wholeNoteCount; i++)
{
time += 96;
Event timeSplitEvent = {};
timeSplitEvent.time = time;
timeSplitEvent.type = EventType::TimeSplit;
outEvents->push_back(timeSplitEvent);
}
}
std::int32_t lutValue = g_noteDurationLUT[diff];
if (lutValue != diff)
{
Event timeSplitEvent = {};
timeSplitEvent.time = time + lutValue;
timeSplitEvent.type = EventType::TimeSplit;
outEvents->push_back(timeSplitEvent);
}
time = event.time;
outEvents->push_back(event);
}
return outEvents;
}
std::unique_ptr<std::vector<Event>> CreateTies(std::vector<Event>& inEvents)
{
std::unique_ptr<std::vector<Event>> outEvents(new std::vector<Event>());
for (const Event& event : inEvents)
{
if (event.type == EventType::Note && event.param2 > 96)
{
Event tieEvent = event;
tieEvent.param2 = -1;
outEvents->push_back(tieEvent);
Event eotEvent = {};
eotEvent.time = event.time + event.param2;
eotEvent.type = EventType::EndOfTie;
eotEvent.note = event.note;
outEvents->push_back(eotEvent);
}
else
{
outEvents->push_back(event);
}
}
return outEvents;
}
void CalculateWaits(std::vector<Event>& events)
{
g_initialWait = events[0].time;
int wholeNoteCount = 0;
for (unsigned i = 0; i < events.size() && events[i].type != EventType::EndOfTrack; i++)
{
events[i].time = events[i + 1].time - events[i].time;
if (events[i].type == EventType::TimeSignature)
{
events[i].type = EventType::WholeNoteMark;
events[i].param2 = wholeNoteCount++;
}
}
}
int CalculateCompressionScore(std::vector<Event>& events, int index)
{
int score = 0;
std::uint8_t lastParam1 = events[index].param1;
std::uint8_t lastVelocity = 0x80u;
EventType lastType = events[index].type;
std::int32_t lastDuration = 0x80000000;
std::uint8_t lastNote = 0x40u;
if (events[index].time > 0)
score++;
for (int i = index + 1; !IsPatternBoundary(events[i].type); i++)
{
if (events[i].type == EventType::Note)
{
int val = 0;
if (events[i].note != lastNote)
{
val++;
lastNote = events[i].note;
}
if (events[i].param1 != lastVelocity)
{
val++;
lastVelocity = events[i].param1;
}
std::int32_t duration = events[i].param2;
if (g_noteDurationLUT[duration] != lastDuration)
{
val++;
lastDuration = g_noteDurationLUT[duration];
}
if (duration != lastDuration)
val++;
if (val == 0)
val = 1;
score += val;
}
else
{
lastDuration = 0x80000000;
if (events[i].type == lastType)
{
if ((lastType != EventType::Controller && (int)lastType != 0x25 && lastType != EventType::EndOfTie) || events[i].param1 == lastParam1)
{
score++;
}
else
{
score += 2;
}
}
else
{
score += 2;
}
}
lastParam1 = events[i].param1;
lastType = events[i].type;
if (events[i].time)
score++;
}
return score;
}
bool IsCompressionMatch(std::vector<Event>& events, int index1, int index2)
{
if (events[index1].type != events[index2].type ||
events[index1].note != events[index2].note ||
events[index1].param1 != events[index2].param1 ||
events[index1].time != events[index2].time)
return false;
index1++;
index2++;
do
{
if (events[index1] != events[index2])
return false;
index1++;
index2++;
} while (!IsPatternBoundary(events[index1].type));
return IsPatternBoundary(events[index2].type);
}
void CompressWholeNote(std::vector<Event>& events, int index)
{
for (int j = index + 1; events[j].type != EventType::EndOfTrack; j++)
{
while (events[j].type != EventType::WholeNoteMark)
{
j++;
if (events[j].type == EventType::EndOfTrack)
return;
}
if (IsCompressionMatch(events, index, j))
{
events[j].type = EventType::Pattern;
events[j].param2 = events[index].param2 & 0x7FFFFFFF;
events[index].param2 |= 0x80000000;
}
}
}
void Compress(std::vector<Event>& events)
{
for (int i = 0; events[i].type != EventType::EndOfTrack; i++)
{
while (events[i].type != EventType::WholeNoteMark)
{
i++;
if (events[i].type == EventType::EndOfTrack)
return;
}
if (CalculateCompressionScore(events, i) >= 6)
{
CompressWholeNote(events, i);
}
}
}
void ReadMidiTracks()
{
long trackHeaderStart = 14;
ReadMidiTrackHeader(trackHeaderStart);
ReadSeqEvents();
g_agbTrack = 1;
for (int midiTrack = 0; midiTrack < g_midiTrackCount; midiTrack++)
{
trackHeaderStart += ReadMidiTrackHeader(trackHeaderStart);
for (g_midiChan = 0; g_midiChan < 16; g_midiChan++)
{
ReadTrackEvents();
if (s_minNote != 0xFF)
{
#ifdef DEBUG
printf("Track%d = Midi-Ch.%d\n", g_agbTrack, g_midiChan + 1);
#endif
std::unique_ptr<std::vector<Event>> events(MergeEvents());
// We don't need TEMPO in anything but track 1.
if (g_agbTrack == 1)
{
auto it = std::remove_if(s_seqEvents.begin(), s_seqEvents.end(), [](const Event& event) { return event.type == EventType::Tempo; });
s_seqEvents.erase(it, s_seqEvents.end());
}
ConvertTimes(*events);
events = InsertTimingEvents(*events);
events = CreateTies(*events);
std::stable_sort(events->begin(), events->end(), EventCompare);
events = SplitTime(*events);
CalculateWaits(*events);
if (g_compressionEnabled)
Compress(*events);
PrintAgbTrack(*events);
g_agbTrack++;
}
}
}
}