/
Midi.cpp
745 lines (652 loc) · 18.3 KB
/
Midi.cpp
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#include <Windows.h>
#include "Midi.h"
#include "KDMAPI.h"
#pragma region Midi Class
Midi::Midi(wchar_t* file_name)
{
//Open the file, seek to the end of the file and save that to a var, then return to the start of the file
file_stream.open(file_name, std::ios::binary | std::ios::ate);
file_stream.seekg(0, std::ios::end);
file_end = file_stream.tellg();
file_stream.seekg(0, std::ios::beg);
//Load the file
loadMidi();
/*
try
{
double seconds = 0;
uint64_t time = 0;
while (true) {
bool all_ended = true;
for (int i = 0; i < track_count; i++)
{
MidiTrack* track = readers[i];
if (track->ended)
{
if (track->time > seconds) seconds = track->time;
continue;
}
all_ended = false;
if (!track->delta_parsed)
track->parseDeltaTime();
if (time < track->tick_time)
continue;
while (time >= track->tick_time) {
track->parseEvent(note_buffer, &misc_events);
track->parseDeltaTime();
if (track->ended)
break;
}
}
time++;
if (all_ended) break;
}
std::cout << "Finished parsing\n";
std::cout << "Seconds length: " << seconds << "\n";
uint64_t notes = 0;
for(int i = 0; i < track_count; i++)
{
notes += readers[i]->notes_parsed;
}
std::cout << "Notes parsed: " << notes;
} catch(const char* e)
{
std::cout << e;
}
*/
}
Midi::~Midi()
{
for(int i = 0; i < 256; i++)
{
moodycamel::ReaderWriterQueue<NoteEvent>* notes = note_event_buffer[i];
delete notes;
}
delete note_event_buffer;
}
void Midi::loadMidi()
{
try
{
assertText("MThd");
uint32_t length = parseInt();
if(length != 6) throw "\nCorrupt Header";
format = parseShort();
parseShort();
ppq = parseShort();
if(format == 2) throw "\nStop using fucking format 2";
uint32_t count = 0;
while(file_stream.tellg() != file_end)
{
assertText("MTrk");
length = parseInt();
size_t pos = file_stream.tellg();
if(length + pos > file_end) length = file_end - pos;
file_stream.seekg(pos + length, std::ios::beg);
MidiChunk chunk;
chunk.start = pos;
chunk.length = length;
tracks.push_back(chunk);
count++;
}
track_count = count;
//Parse all the tracks and the note cout for each track
uint64_t nc = 0;
uint32_t tc = 0;
uint32_t tn = 0;
MidiTrack** parse_tracks = new MidiTrack * [track_count];
concurrency::parallel_for(uint32_t(0), track_count, [&](uint32_t i)
{
MidiTrack* track = new MidiTrack(&file_stream, tracks[i].start, tracks[i].length, 100000, i, ppq, &mtx);
parse_tracks[i] = track;
while (!track->ended)
{
track->parseDelta();
track->parseEvent(nullptr, nullptr);
}
mtx.lock();
tc += track->tempo_events.size();
tn++;
std::cout << "\nParsed track " << tn << " note count " << track->notes_parsed;
nc += (uint64_t)track->notes_parsed;
mtx.unlock();
});
/*for(int i = 0; i < track_count; i++)
{
MidiTrack* track = new MidiTrack(&file_stream, tracks[i].start, tracks[i].length, 100000, i, ppq);
parse_tracks[i] = track;
while(!track->ended)
{
track->parseDelta();
track->parseEvent1();
}
tc += track->tempo_events.size();
std::cout << "\nParsed track " << i << " note count " << track->notes_parsed;
nc += (uint64_t)track->notes_parsed;
}*/
std::cout << "\nTotal tempo events: " << tc;
std::cout << "\nTotal notes: " << nc << std::endl;
tempo_array = new Tempo[tc];
tempo_count = tc;
uint32_t t = 0;
uint32_t* track_tempo_index = new uint32_t[track_count];
for(int i = 0; i < track_count; i++) track_tempo_index[i] = 0;
while(t < tempo_count)
{
int min = -1;
uint64_t min_time = 0;
for(int i = 0; i < track_count; i++)
{
if(track_tempo_index[i] < parse_tracks[i]->tempo_events.size())
{
uint64_t pos = parse_tracks[i]->tempo_events[track_tempo_index[i]].pos;
if(min == -1 || min_time > pos)
{
min_time = pos;
min = i;
}
}
}
if(min == -1)
{
std::cout << "Broke\n";
break;
}
tempo_array[t++] = parse_tracks[min]->tempo_events[track_tempo_index[min]];
track_tempo_index[min]++;
}
uint64_t tick_time = 0;
for(int i = 0; i < track_count; i++) delete parse_tracks[i];
delete[] parse_tracks;
delete[] track_tempo_index;
readers = new MidiTrack * [count];
for(int i = 0; i < count; i++)
{
readers[i] = new MidiTrack(&file_stream, tracks[i].start, tracks[i].length, 100000, i, ppq, &mtx);
readers[i]->global_tempo_events = tempo_array;
readers[i]->global_tempo_event_count = tempo_count;
}
note_event_buffer = new moodycamel::ReaderWriterQueue<NoteEvent>* [256];
for(int i = 0; i < 256; i++)
{
note_event_buffer[i] = new moodycamel::ReaderWriterQueue<NoteEvent>();
}
} catch(const char* e)
{
MessageBoxA(NULL, "This MIDI doesn't appear to be valid.", "Fatal Error", MB_ICONERROR);
exit(1);
}
}
void Midi::assertText(const char* text)
{
for(int i = 0; text[i] != 0; i++)
{
if(text[i] != readByte())
{
throw "\nCorrupt Chunk Header";
}
}
}
uint8_t Midi::readByte()
{
uint8_t b;
file_stream.read((char*)&b, 1);
return b;
}
uint16_t Midi::parseShort()
{
uint16_t length = 0;
for(int i = 0; i != 2; i++)
{
length = (uint16_t)(length << 8) | (uint8_t)readByte();
}
return length;
}
uint32_t Midi::parseInt()
{
uint32_t length = 0;
for(int i = 0; i != 4; i++)
{
length = (uint32_t)(length << 8) | (uint8_t)readByte();
}
return length;
}
void Midi::SpawnLoaderThread()
{
loader_thread = std::thread(&Midi::LoaderThread, this);
}
void Midi::LoaderThread()
{
double seconds = 0;
uint64_t time = 0;
bool all_ended = false;
while (true) {
bool* tracks_ended = new bool[track_count];
memset(tracks_ended, 0, track_count);
while (seconds < renderer_time.load() + 10.0f)
{
for (int i = 0; i < track_count; i++)
{
MidiTrack* track = readers[i];
if (track->ended) {
tracks_ended[i] = true;
if (!track->notes_ended) {
track->notes_ended = true;
NoteEvent e;
e.time = seconds;
e.track = i;
e.type = NoteEventType::TrackEnded;
for (int y = 0; y < 256; y++)
note_event_buffer[y]->enqueue(e);
}
continue;
}
if (!track->delta_parsed)
track->parseDeltaTime();
if (time < track->tick_time)
continue;
while (time >= track->tick_time) {
track->parseEvent(note_event_buffer, &misc_events);
if (track->time > seconds) seconds = track->time;
track->parseDeltaTime();
if (track->ended) {
tracks_ended[i] = true;
break;
}
}
}
time++;
all_ended = true;
for (int i = 0; i < track_count; i++) {
if (tracks_ended[i] == false) {
all_ended = false;
break;
}
}
if (all_ended)
break;
}
delete[] tracks_ended;
if (all_ended)
break;
}
misc_events.enqueue({ static_cast<float>(seconds), PLAYBACK_TERMINATE_EVENT });
printf("\nloader thread exiting\n");
}
void Midi::SpawnPlaybackThread(std::chrono::steady_clock::time_point _start_time)
{
start_time = _start_time;
playback_thread = std::thread(&Midi::PlaybackThread, this);
}
void Midi::PlaybackThread()
{
// this not only plays pitch bend and other events, but normal note events too
while (true) {
bool stop_requested = false;
auto current_time = std::chrono::high_resolution_clock::now();
float time = std::chrono::duration<float, std::chrono::seconds::period>(current_time - start_time).count();
MidiEvent event;
while (misc_events.try_dequeue(event)) {
while (time < event.time) {
current_time = std::chrono::high_resolution_clock::now();
time = std::chrono::duration<float, std::chrono::seconds::period>(current_time - start_time).count();
}
auto msg = event.msg;
if (msg == PLAYBACK_TERMINATE_EVENT) {
stop_requested = true;
break;
}
KDMAPI::SendDirectData(msg);
}
if (stop_requested)
break;
}
printf("\nplayback thread exiting\n");
}
#pragma endregion
#pragma region BufferedReader class
BufferedReader::BufferedReader(std::ifstream* _file_stream, size_t _start, size_t _length, uint32_t _buffer_size, std::mutex* _mtx)
{
file_stream = _file_stream;
start = _start;
length = _length;
buffer_size = _buffer_size;
pos = start;
mtx = _mtx;
buffer_start = start;
if (buffer_size > length) buffer_size = (uint32_t)length;
buffer = new uint8_t[buffer_size];
updateBuffer();
}
BufferedReader::~BufferedReader()
{
delete[] buffer;
}
void BufferedReader::updateBuffer()
{
uint32_t read = buffer_size;
if ((pos + read) > (start + length))
read = start + length - pos;
if (read == 0)
throw "\nOutside the buffer";
mtx->lock();
file_stream->seekg(pos, std::ios::beg);
file_stream->read((char*)buffer, read);
mtx->unlock();
buffer_start = pos;
buffer_pos = 0;
}
// origin = fseek origin (SEEK_SET or SEEK_CUR, no need for SEEK_END)
// storage as int64 is fine, nobody will have a midi over 9223 pb
void BufferedReader::seek(int64_t offset, int origin)
{
if (origin != SEEK_SET && origin != SEEK_CUR)
throw "Invalid seek origin!";
int64_t real_offset = offset;
if (origin == SEEK_SET)
real_offset += start;
else
real_offset += pos;
if (real_offset < (int64_t)start)
throw "Attempted to seek before start!";
if (real_offset > start + length)
throw "Attempted to seek past end!";
pos = real_offset;
// buffer doesn't have to be remade if seeking between it already
if (buffer_start <= real_offset && real_offset < buffer_start + buffer_size) {
buffer_pos = pos - buffer_start;
return;
}
updateBuffer();
}
void BufferedReader::read(uint8_t* dst, size_t size)
{
if (pos + size > start + length)
throw "Attempted to read past end!";
if (size > buffer_size)
throw "(UMIMPLEMENTED) Requested read size is larger than the buffer size!";
if (buffer_start + buffer_pos + size > buffer_start + buffer_size)
updateBuffer();
memcpy(dst, buffer + buffer_pos, size);
pos += size;
buffer_pos += size;
}
uint8_t BufferedReader::readByte()
{
uint8_t ret;
read(&ret, 1);
return ret;
}
void BufferedReader::skipBytes(size_t size) {
seek(size, SEEK_CUR);
}
#pragma endregion
#pragma region Midi Track
MidiTrack::MidiTrack(std::ifstream* _file_stream, size_t _start, size_t _length, uint32_t _buffer_size, uint32_t _track_num, uint16_t _ppq, std::mutex* _mtx)
{
reader = new BufferedReader(_file_stream, _start, _length, _buffer_size, _mtx);
ppq = _ppq;
track_num = _track_num;
}
MidiTrack::~MidiTrack()
{
delete reader;
}
void MidiTrack::parseDelta()
{
if(ended) return;
try
{
uint8_t c;
uint32_t val = 0;
while((c = reader->readByte()) > 0x7F)
{
val = (val << 7) | (c & 0x7F);
}
val = val << 7 | c;
tick_time += val;
delta_parsed = true;
} catch(const char* e)
{
ended = true;
}
}
void MidiTrack::parseDeltaTime()
{
if(ended) return;
try
{
uint8_t c;
uint32_t val = 0;
while((c = reader->readByte()) > 0x7F)
{
val = (val << 7) | (c & 0x7F);
}
val = val << 7 | c;
while(global_tempo_event_index < global_tempo_event_count && val + tick_time > global_tempo_events[global_tempo_event_index].pos)
{
Tempo t = global_tempo_events[global_tempo_event_index];
uint64_t offset = t.pos - tick_time;
val -= offset;
time += offset * tempo_multiplier;
tempo_multiplier = multiplierFromTempo(t.tempo, ppq);
tick_time += offset;
global_tempo_event_index++;
}
time += val * tempo_multiplier;
tick_time += val;
delta_parsed = true;
} catch(const char* e)
{
ended = true;
}
}
double MidiTrack::multiplierFromTempo(uint32_t tempo, uint16_t ppq)
{
return tempo / 1000000.0 / ppq;
}
void MidiTrack::parseEvent(moodycamel::ReaderWriterQueue<NoteEvent>** global_note_events, moodycamel::ReaderWriterQueue<MidiEvent>* global_misc)
{
bool stage_2 = global_note_events != nullptr;
if(ended)
{
return;
}
try
{
delta_parsed = false;
uint8_t command = reader->readByte();
if(command < 0x80)
{
reader->seek(-1, SEEK_CUR);
command = prev_command;
}
prev_command = command;
uint8_t cmd = (uint8_t)(command & 0xF0);
uint8_t channel = (uint8_t)(command & 0x0F);
switch(cmd)
{
case 0x80: // Note Off
if (stage_2)
{
uint8_t key = reader->readByte();
uint8_t vel = reader->readByte();
MidiEvent midi_event;
midi_event.time = static_cast<float>(time);
midi_event.msg = MAKELONG(MAKEWORD((channel) | (8 << 4), key), MAKEWORD(vel, 0));
global_misc->enqueue(midi_event);
NoteEvent note_event;
note_event.time = static_cast<float>(time);
note_event.track = track_num * 16 + channel;
note_event.type = NoteEventType::NoteOff;
global_note_events[key]->enqueue(note_event);
break;
}
else
{
reader->readByte();
reader->readByte();
}
break;
case 0x90: // Note On
if (stage_2)
{
uint8_t key = reader->readByte();
uint8_t vel = reader->readByte();
if (vel > 0)
{
MidiEvent event;
event.time = static_cast<float>(time);
event.msg = MAKELONG(MAKEWORD((channel) | (9 << 4), key), MAKEWORD(vel, 0));
global_misc->enqueue(event);
NoteEvent note_event;
note_event.time = static_cast<float>(time);
note_event.track = track_num * 16 + channel;
note_event.type = NoteEventType::NoteOn;
global_note_events[key]->enqueue(note_event);
}
else
{
MidiEvent event;
event.time = static_cast<float>(time);
event.msg = MAKELONG(MAKEWORD((channel) | (8 << 4), key), MAKEWORD(vel, 0));
global_misc->enqueue(event);
NoteEvent note_event;
note_event.time = static_cast<float>(time);
note_event.track = track_num * 16 + channel;
note_event.type = NoteEventType::NoteOff;
global_note_events[key]->enqueue(note_event);
}
break;
}
else
{
reader->readByte();
if (reader->readByte() > 0) notes_parsed++;
}
break;
case 0xA0: // Polyphonic Pressure
case 0xB0: // Controller
case 0xE0: // Pitch Wheel
if (stage_2)
{
MidiEvent event;
event.time = static_cast<float>(time);
event.msg = ((command & 0xFF) | ((reader->readByte() & 0xFF) << 8)) & 0xFFFF | ((reader->readByte() & 0xFF) << 16);
global_misc->enqueue(event);
}
else
{
reader->skipBytes(2);
}
break;
case 0xC0: // Program Change
case 0xD0: // Channel Pressure
if (stage_2)
{
MidiEvent event;
event.time = static_cast<float>(time);
event.msg = ((cmd & 0xFF) | ((reader->readByte() & 0xFF) << 8));
global_misc->enqueue(event);
}
else
{
reader->skipBytes(1);
}
break;
case 0xF0: // System Event
{
switch(command)
{
case 0xFF:
{
uint8_t command2 = reader->readByte();
uint8_t c;
uint32_t val = 0;
while((c = reader->readByte()) > 0x7F)
{
val = (val << 7) | (c & 0x7F);
}
val = val << 7 | c;
switch(command2)
{
case 0x00: // Sequence number
reader->skipBytes(2);
break;
case 0x01: // Text
case 0x02: // Copyright info
case 0x03: // Track name
case 0x04: // Track instrument name
case 0x05: // Lyric
case 0x06: // Marker
case 0x07: // Cue point
case 0x7F: // Sequencer-specific information
reader->skipBytes(val);
break;
case 0x20: // MIDI Channel prefix
reader->skipBytes(1);
break;
case 0x21: // MIDI Port
reader->skipBytes(1);
break;
case 0x2F:
// End of track
ended = true;
break;
case 0x51: // Tempo
{
uint32_t tempo = 0;
for (int i = 0; i != 3; i++)
tempo = (uint32_t)((tempo << 8) | reader->readByte());
if (!stage_2) {
Tempo t;
t.pos = tick_time;
t.tempo = tempo;
tempo_events.push_back(t);
}
break;
}
case 0x54:
// SMPTE Offset
reader->skipBytes(5);
break;
case 0x58:
// Time signature
reader->skipBytes(4);
break;
case 0x59:
// Key signature
reader->skipBytes(2);
break;
default:
{
printf("\nUnknown system event 0x%x", command2);
reader->skipBytes(val);
break;
}
}
break;
}
case 0xF0:
while(reader->readByte() != 0xF7);
break;
case 0xF2:
reader->readByte();
reader->readByte();
break;
case 0xF3:
reader->readByte();
break;
default:
break;
}
break;
}
}
} catch(const char* e)
{
std::cout << e;
ended = true;
}
}
#pragma endregion