ChocolateBird/scripts/MusicPlayer.gd

#warning-ignore-all:shadowed_variable
extends Node
const music := preload('res://scripts/loaders/snes/music_ff5.gd')
const EventType := music.EventType
var MUSIC := music.new()

var inst_map: Dictionary  # int keys, AudioStreamSample values
var tracks: Array
var num_tracks: int
var players: Array
var tempo: float  # Store as BPM
var seconds_per_pulse: float
var master_volume := 255
var channel_pointer := PoolIntArray()
var channel_instrument_idx := PoolByteArray()
var channel_next_pulse := PoolIntArray()
var channel_current_note := PoolByteArray()
var channel_velocity := PoolByteArray()
var channel_pan := PoolByteArray()  # Reversed from MIDI
var channel_octave := PoolByteArray()
var channel_transpose := PoolByteArray()
var channel_fine_tuning := PoolRealArray()
var channel_adsr_attack := PoolByteArray()
var channel_adsr_decay := PoolByteArray()
var channel_adsr_sustain := PoolByteArray()
var channel_adsr_release := PoolByteArray()
var channel_noise_freq := PoolByteArray()
var channel_noise_on := PoolByteArray()
var channel_pan_lfo_rate := PoolByteArray()
var channel_pan_lfo_depth := PoolByteArray()
var channel_pan_lfo_on := PoolByteArray()
var channel_tremolo_delay := PoolByteArray()
var channel_tremolo_rate := PoolByteArray()
var channel_tremolo_depth := PoolByteArray()
var channel_tremolo_on := PoolByteArray()
var channel_vibrato_delay := PoolByteArray()
var channel_vibrato_rate := PoolByteArray()
var channel_vibrato_depth := PoolByteArray()
var channel_vibrato_on := PoolByteArray()
var channel_pitchmod_on := PoolByteArray()
var channel_echo_on := PoolByteArray()
var channel_echo_volume := PoolByteArray()

func set_tempo(tempo: float):
	self.tempo = tempo
	self.seconds_per_pulse = 60.0 / (tempo * music.PPQN)

func _init(tracks: Array, instrument_map: Dictionary):
	self.tracks = tracks
	self.num_tracks = len(self.tracks)
	self.inst_map = instrument_map
	self.players = []
	self.set_tempo(120.0)
	for i in num_tracks:
		self.players.append(AudioStreamPlayer.new())
		add_child(self.players[-1])
		self.channel_pointer.append(0)
		self.channel_instrument_idx.append(0)
		self.channel_next_pulse.append(0)
		self.channel_current_note.append(0)
		self.channel_velocity.append(100)
		self.channel_pan.append(0)
		self.channel_octave.append(5)
		self.channel_transpose.append(0)
		self.channel_fine_tuning.append(1.0)
		self.channel_adsr_attack.append(0)
		self.channel_adsr_decay.append(0)
		self.channel_adsr_sustain.append(0)
		self.channel_adsr_release.append(0)
		self.channel_noise_freq.append(0)
		self.channel_noise_on.append(0)
		self.channel_pan_lfo_rate.append(0)
		self.channel_pan_lfo_depth.append(0)
		self.channel_pan_lfo_on.append(0)
		self.channel_tremolo_delay.append(0)
		self.channel_tremolo_rate.append(0)
		self.channel_tremolo_depth.append(0)
		self.channel_tremolo_on.append(0)
		self.channel_vibrato_delay.append(0)
		self.channel_vibrato_rate.append(0)
		self.channel_vibrato_depth.append(0)
		self.channel_vibrato_on.append(0)
		self.channel_pitchmod_on.append(0)
		self.channel_echo_on.append(0)
		self.channel_echo_volume.append(0)

func play_channel(channel: int, time_offset: float = 0.0) -> int:
	# Executes the track events until it hits a note/rest, in which case it returns the pulse count to the next action, or the end of the events, in which case it returns -1
	# self.players[channel].stop()
	var track: Array = self.tracks[channel]
	var l := len(track)
	var player: AudioStreamPlayer = self.players[channel]
	while true:
		var ptr: int = self.channel_pointer[channel]
		if ptr >= l:
			break
		var event = track[ptr]
		self.channel_pointer[channel] += 1
		match event[0]:  # Control codes
			EventType.NOTE:
				var note = event[1]
				var duration = event[2]
				if note >= 0:  # Don't shift or play rests
					note += (12 * self.channel_octave[channel]) + self.channel_transpose[channel]
					player.pitch_scale = pow(2.0, (note - MUSIC.REFERENCE_NOTE)/12.0) #* self.channel_fine_tuning[channel]
					player.volume_db = linear2db((self.channel_velocity[channel]/255.0) * (self.master_volume/255.0))
					player.play(max((SoundLoader.PLAY_START - time_offset)/player.pitch_scale, 0))
					self.channel_current_note[channel] = note
				elif note == music.NOTE_IS_TIE:
					pass
				else:
					self.players[channel].stop()
					self.channel_current_note[channel] = -1
				# TODO: Confirm tempo scaling
				return duration  # Pulses to next instruction
			EventType.VOLUME:
				self.channel_velocity[channel] = event[1]
			EventType.VOLUME_SLIDE:  # TODO: implement slides
				var slide_duration: int = event[1]
				self.channel_velocity[channel] = event[2]
			EventType.PAN:  # TODO: implement slides
				self.channel_pan[channel] = event[1]
			EventType.PAN_SLIDE:  # TODO: implement slides
				var slide_duration: int = event[1]
				self.channel_pan[channel] = event[2]
			EventType.PITCH_SLIDE:  # TODO: implement slides
				var slide_duration: int = event[1]
				var target_pitch: int = event[2]  # Signed
			EventType.VIBRATO_ON:
				self.channel_vibrato_delay[channel] = event[1]
				self.channel_vibrato_rate[channel] = event[2]
				self.channel_vibrato_depth[channel] = event[3]
				self.channel_vibrato_on[channel] = 1
			EventType.VIBRATO_OFF:
				self.channel_vibrato_on[channel] = 0
			EventType.TREMOLO_ON:
				self.channel_tremolo_delay[channel] = event[1]
				self.channel_tremolo_rate[channel] = event[2]
				self.channel_tremolo_depth[channel] = event[3]
				self.channel_tremolo_on[channel] = 1
			EventType.TREMOLO_OFF:
				self.channel_tremolo_on[channel] = 0
			EventType.PAN_LFO_ON:
				self.channel_pan_lfo_depth[channel] = event[1]
				self.channel_pan_lfo_rate[channel] = event[2]
				self.channel_pan_lfo_on[channel] = 1
			EventType.PAN_LFO_OFF:
				self.channel_pan_lfo_on[channel] = 0
			EventType.NOISE_FREQ:
				self.channel_noise_freq[channel] = event[1]
			EventType.NOISE_ON:
				self.channel_noise_on[channel] = 1
			EventType.NOISE_OFF:
				self.channel_noise_on[channel] = 0
			EventType.PITCHMOD_ON:
				self.channel_pitchmod_on[channel] = 1
			EventType.PITCHMOD_OFF:
				self.channel_pitchmod_on[channel] = 0
			EventType.ECHO_ON:
				self.channel_echo_on[channel] = 1
			EventType.ECHO_OFF:
				self.channel_echo_on[channel] = 0
			EventType.OCTAVE:
				self.channel_octave[channel] = event[1]
			EventType.OCTAVE_UP:
				self.channel_octave[channel] += 1
			EventType.OCTAVE_DOWN:
				self.channel_octave[channel] -= 1
			EventType.TRANSPOSE_ABS:
				self.channel_transpose[channel] = event[1]
			EventType.TRANSPOSE_REL:
				self.channel_transpose[channel] += event[1]
			EventType.TUNING:
				var fine_tune: int = event[1]
				var scale: float
				if fine_tune < 0x80:
					scale = 1.0 + fine_tune/255.0
				else:
					scale = fine_tune/255.0
				self.channel_fine_tuning[channel] = scale
			EventType.PROGCHANGE:
				self.channel_instrument_idx[channel] = event[1]
				player.stream = self.inst_map[self.channel_instrument_idx[channel]]
				# TODO - grab instrument envelope
			EventType.ADSR_ATTACK:
				self.channel_adsr_attack[channel] = event[1]
			EventType.ADSR_DECAY:
				self.channel_adsr_decay[channel] = event[1]
			EventType.ADSR_SUSTAIN:
				self.channel_adsr_sustain[channel] = event[1]
			EventType.ADSR_RELEASE:
				self.channel_adsr_release[channel] = event[1]
			EventType.ADSR_DEFAULT:  # TODO - grab instrument envelope
				pass
			EventType.TEMPO:
				self.set_tempo(music.tempo_to_bpm(event[1]))
			EventType.TEMPO_SLIDE:
				self.set_tempo(music.tempo_to_bpm(event[2]))
				var slide_duration: int = event[1]
			EventType.ECHO_VOLUME:
				self.channel_echo_volume[channel] = event[1]
			EventType.ECHO_VOLUME_SLIDE:  # TODO: implement slides
				self.channel_echo_volume[channel] = event[2]
				var slide_duration: int = event[1]
			EventType.ECHO_FEEDBACK_FIR:  # TODO
				var feedback: int = event[1]
				var filterIndex: int = event[2]
			EventType.MASTER_VOLUME:
				self.master_volume = event[1]
			EventType.GOTO:
				self.channel_pointer[channel] = event[1]
			EventType.END:
				break
			_:
				break
	return -1  # End of track

func play_pulse(time_offset := 0.0) -> bool:  # Return true if any channel played
	var active_channels := 0
	for channel in self.num_tracks:
		if self.channel_next_pulse[channel] < 0:
			continue  # Channel not playing
		active_channels += 1
		if self.channel_next_pulse[channel] == 0:
			self.channel_next_pulse[channel] = self.play_channel(channel, time_offset)
		self.channel_next_pulse[channel] -= 1
	return active_channels > 0

var is_playing := false
var bgm_timestamp := 0.0  # Note this will be behind by the maximum delay
func _process(delta: float) -> void:
	if self.is_playing:
		bgm_timestamp += delta
		while bgm_timestamp > seconds_per_pulse:
			bgm_timestamp -= seconds_per_pulse
			self.is_playing = play_pulse(bgm_timestamp)
			if not self.is_playing:
				print('BGM finished playing')


# TODO: need to interleave channels for tempo and master volume!
const MAX_NOTE_EVENTS := 2048
class NoteEvent:
	var p_start: int  # In pulse space
	var p_end: int
	var instrument: int
	var pitch: int
	var velocity: float
	var adsr_attack: int
	var adsr_decay: int
	var adsr_sustain: int
	var adsr_release: int


class TrackCurve:  # built-in Curve class is too restrictive for this
	var default: float
	var entries: PoolVector3Array
	var baked_integrals: PoolRealArray
	func _init(default: float = 0.0):
		self.default = default
		self.entries = PoolVector3Array()
		self.baked_integrals = PoolRealArray()

	func add_point(pulse: int, value: float, ramp_to_next: bool) -> void:
		var l := len(self.entries)
		var entry := Vector3(float(pulse), value, float(ramp_to_next))
		if l == 0 or self.entries[-1].x < pulse:
			self.entries.append(entry)
		else:  # Find the first entry bigger than pulse, and insert before
			for i in l:
				if self.entries[i].x > pulse:
					self.entries.insert(i, entry)
					break

	var last_pulse_block_get: int = -1  # Cache previous position for sequential lookups
	func get_pulse(pulse: float) -> float:
		var l := len(self.entries)
		if l == 0 or pulse < self.entries[-1].x:
			return self.default
		if pulse > self.entries[-1].x:
			return self.entries[-1].y
		for i in l-2:
			# Find first entry beyond
			if pulse < self.entries[i+1].x:
				if self.entries[i].z > 0:  # ramp_to_next
					return range_lerp(pulse, self.entries[i].x, self.entries[i+1].x, self.entries[i].y, self.entries[i+1].y)
				else:
					return self.entries[i].y
		return self.default  # Should be unreachable

	func bake_integrals():
		# Store the starting integrated value (i.e. time for the tempo curve) of each pulse value
		self.baked_integrals.clear()
		var last_pulse := 0.0
		var last_value := self.default
		var last_integral := 0.0
		var last_ramp := false
		for entry in self.entries:
			var step_pulse = entry.x - last_pulse
			var integral := last_integral
			if last_ramp:
				# Treat it as a rectangle where the height is the average of the slanted top.
				integral += step_pulse * (last_value + entry.y)/2.0
			else:
				integral += step_pulse * last_value
			self.baked_integrals.append(integral)
			last_pulse = entry.x
			last_value = entry.y
			last_integral = integral
			last_ramp = entry.z > 0

	var last_integral_block_get: int = -1  # Cache previous position for sequential lookups
	func get_integral(pulse: float) -> float:
		# This is for tempo -> time. Need to bake it to have any hope of efficiency.
		if self.baked_integrals.empty():
			self.bake_integrals()
		# Find first entry earlier than the pulse
		for i in range(len(self.entries)-1, -1, -1):
			var entry = self.entries[i]
			if pulse > entry.x:
				var integral = self.baked_integrals[i]
				var step_pulse = pulse - entry.x
				if entry.z:  # Ramp to next
					# Treat it as a rectangle where the height is the average of the slanted top.
					integral += step_pulse * (entry.y + entries[i+1].y)/2.0  # If last entry somehow has ramp-to-next (it shouldn't), this will out-of-range error
				else:
					integral += step_pulse * entry.y
				return integral
		return 0.0


func render_channels(_t_start: float, _t_end: float, inst_map: Array) -> Array:  # [data: PoolByteArray, target_time_length: float in seconds]
	# Since some channels contain global events (tempo and global volume for now),
	# the strategy will be to preprocess each channel in a global-state-agnostic way,
	# then once all the global tracks are known, as well as the longest unlooped length,
	# do a second pass to generate the final events
	# self.print_channel_events(inst_map)
	var instrument_adsrs = RomLoader.snes_data.bgm_instrument_adsrs  # TODO: UNHARDCODE THIS
	var all_note_events = []

	var curve_master_volume := TrackCurve.new(100.0/255.0)  # [0.0, 1.0] for now
	var curve_master_tempo := TrackCurve.new(120.0)  # bpm is too big, need pulses per second

	var curve_channel_pans := []

	for channel in self.num_tracks:
		var curve_velocity := TrackCurve.new(100.0/255.0)  # [0.0, 1.0] for now
		var curve_pan := TrackCurve.new()  # [-1.0, 1.0] for now
		var channel_note_events = []
		var track: Array = self.tracks[channel]
		var l := len(track)
		var p := 0  # current pulse

		if l == 0:  # Empty channel, move on
			all_note_events.append(channel_note_events)
			curve_channel_pans.append(curve_pan)
			continue

		# var num_notes: int = 0
		var current_instrument := 0
		var current_octave := 5
		var current_transpose := 0
		# var current_velocity := 100
		var current_adsr_attack := 0
		var current_adsr_decay := 0
		var current_adsr_sustain := 0
		var current_adsr_release := 0

		# First, check if it ends in a GOTO, then store the program counter of the destination
		var infinite_loop_target_program_counter = -1
		var infinite_loop_target_pulse = -1
		if track[-1][0] == EventType.GOTO:
			infinite_loop_target_program_counter = track[-1][1]

		var program_counter := 0
		while true:  #num_notes < MAX_NOTE_EVENTS:
			if program_counter >= l:
				break
			if program_counter == infinite_loop_target_program_counter:
				infinite_loop_target_pulse = p
			var event = track[program_counter]
			program_counter += 1
			match event[0]:  # Control codes
				EventType.GOTO:  # This is a preprocessed event list, so GOTO is a final infinite loop marker
					var note_event = NoteEvent.new()
					note_event.p_start = p
					note_event.p_end = infinite_loop_target_pulse  # Fake final note event using p_start > p_end to encode the infinite jump back loop.
					# Note that event[1] points to an Event, not a NoteEvent, not a Pulse, so we looked it up earlier
					channel_note_events.append(note_event)
					break
				EventType.MASTER_VOLUME:
					curve_master_volume.add_point(p, event[1]/255.0, false)
				EventType.TEMPO:
					var new_tempo = music.tempo_to_seconds_per_pulse(event[1])
					curve_master_tempo.add_point(p, new_tempo, false)
				EventType.TEMPO_SLIDE:
					var old_tempo = curve_master_tempo.get_pulse(p)
					var new_tempo = music.tempo_to_seconds_per_pulse(event[2])
					var slide_duration: int = event[1]  # TODO: work out how this is scaled
					curve_master_tempo.add_point(p, old_tempo, true)
					curve_master_tempo.add_point(p + slide_duration, new_tempo, false)
				EventType.NOTE:
					var note = event[1]
					var duration = event[2]
					if note >= 0:  # Don't shift or play rests
						note += (12 * current_octave) + current_transpose
						var note_event = NoteEvent.new()
						note_event.p_start = p
						note_event.p_end = p + duration
						note_event.instrument = current_instrument
						note_event.pitch = note  # pitch_idx  #* self.channel_fine_tuning[channel]
						note_event.velocity = curve_velocity.get_pulse(p)  # current_velocity
						note_event.adsr_attack = current_adsr_attack
						note_event.adsr_decay = current_adsr_decay
						note_event.adsr_sustain = current_adsr_sustain
						note_event.adsr_release = current_adsr_release
						channel_note_events.append(note_event)
						# num_notes += 1
					elif note == music.NOTE_IS_TIE:
						channel_note_events[-1].p_end += duration
					p += duration
				EventType.VOLUME:
					var new_velocity: float = event[1]/255.0
					curve_velocity.add_point(p, new_velocity, false)
				EventType.VOLUME_SLIDE:  # TODO: implement slides
					var old_velocity = curve_velocity.get_pulse(p)
					var slide_duration: int = event[1]
					var new_velocity: float = event[2]/255.0
					curve_velocity.add_point(p, old_velocity, true)
					curve_velocity.add_point(p + slide_duration, new_velocity, false)
				EventType.PAN:
					var new_pan = 1.0 - event[1]/127.5
					curve_pan.add_point(p, new_pan, false)
				EventType.PAN_SLIDE:  # TODO: implement slides
					var old_pan = curve_pan.get_pulse(p)
					var new_pan = 1.0 - event[2]/127.5
					var slide_duration: int = event[1]  # TODO: work out how slides are scaled
					curve_pan.add_point(p, old_pan, true)
					curve_pan.add_point(p + slide_duration, new_pan, false)
				EventType.PITCH_SLIDE:  # TODO: implement slides
					var slide_duration: int = event[1]
					var target_pitch: int = event[2]  # Signed
				EventType.OCTAVE:
					current_octave = event[1]
				EventType.OCTAVE_UP:
					current_octave += 1
				EventType.OCTAVE_DOWN:
					current_octave -= 1
				EventType.TRANSPOSE_ABS:
					current_transpose = event[1]
				EventType.TRANSPOSE_REL:
					current_transpose += event[1]
				EventType.TUNING:
					var fine_tune: int = event[1]
					var scale: float
					if fine_tune < 0x80:
						scale = 1.0 + fine_tune/255.0
					else:
						scale = fine_tune/255.0
					self.channel_fine_tuning[channel] = scale
				EventType.PROGCHANGE:
					var event_idx = event[1]-0x20
					if event_idx >= 0:
						current_instrument = inst_map[event_idx] - 1
						if current_instrument < len(instrument_adsrs) and current_instrument > 0:
							var adsr = instrument_adsrs[current_instrument]
							current_adsr_attack = adsr[2]
							current_adsr_decay = adsr[3]
							current_adsr_sustain = adsr[0]
							current_adsr_release = adsr[1]
				EventType.ADSR_DEFAULT:  # TODO - Investigate actual scaling and order
					if current_instrument < len(instrument_adsrs) and current_instrument > 0:
						var adsr = instrument_adsrs[current_instrument]
						current_adsr_attack = adsr[2]
						current_adsr_decay = adsr[3]
						current_adsr_sustain = adsr[0]
						current_adsr_release = adsr[1]
				EventType.ADSR_ATTACK:
					current_adsr_attack = event[1]
				EventType.ADSR_DECAY:
					current_adsr_decay = event[1]
				EventType.ADSR_SUSTAIN:
					current_adsr_sustain = event[1]
				EventType.ADSR_RELEASE:
					current_adsr_release = event[1]
				EventType.VIBRATO_ON:
					self.channel_vibrato_delay[channel] = event[1]
					self.channel_vibrato_rate[channel] = event[2]
					self.channel_vibrato_depth[channel] = event[3]
					self.channel_vibrato_on[channel] = 1
				EventType.VIBRATO_OFF:
					self.channel_vibrato_on[channel] = 0
				EventType.TREMOLO_ON:
					self.channel_tremolo_delay[channel] = event[1]
					self.channel_tremolo_rate[channel] = event[2]
					self.channel_tremolo_depth[channel] = event[3]
					self.channel_tremolo_on[channel] = 1
				EventType.TREMOLO_OFF:
					self.channel_tremolo_on[channel] = 0
				EventType.PAN_LFO_ON:
					self.channel_pan_lfo_depth[channel] = event[1]
					self.channel_pan_lfo_rate[channel] = event[2]
					self.channel_pan_lfo_on[channel] = 1
				EventType.PAN_LFO_OFF:
					self.channel_pan_lfo_on[channel] = 0
				EventType.NOISE_FREQ:
					self.channel_noise_freq[channel] = event[1]
				EventType.NOISE_ON:
					self.channel_noise_on[channel] = 1
				EventType.NOISE_OFF:
					self.channel_noise_on[channel] = 0
				EventType.PITCHMOD_ON:
					self.channel_pitchmod_on[channel] = 1
				EventType.PITCHMOD_OFF:
					self.channel_pitchmod_on[channel] = 0
				EventType.ECHO_ON:
					self.channel_echo_on[channel] = 1
				EventType.ECHO_OFF:
					self.channel_echo_on[channel] = 0
				EventType.ECHO_VOLUME:
					self.channel_echo_volume[channel] = event[1]
				EventType.ECHO_VOLUME_SLIDE:  # TODO: implement slides
					self.channel_echo_volume[channel] = event[2]
					var slide_duration: int = event[1]
				EventType.ECHO_FEEDBACK_FIR:  # TODO
					var feedback: int = event[1]
					var filterIndex: int = event[2]
				EventType.END:
					break
				_:
					break
		# End of track
		all_note_events.append(channel_note_events)
		curve_channel_pans.append(curve_pan)

	# Integrate tempo so we can get a pulse->time mapping
	curve_master_tempo.bake_integrals()
	# Find the longest channel
	var channel_loop_p_returns = PoolIntArray()
	var channel_loop_p_lengths = PoolIntArray()
	var longest_channel_idx = 0
	var longest_channel_p_end = 0
	var highest_channel_p_return = -1
	for channel in self.num_tracks:
		if all_note_events[channel].empty():
			channel_loop_p_returns.append(-1)
			continue
		var note_event: NoteEvent = all_note_events[channel][-1]
		var p_end = note_event.p_end
		if p_end < note_event.p_start:
			# Ends on infinite loop
			channel_loop_p_returns.append(p_end)
			channel_loop_p_lengths.append(note_event.p_start - p_end)
			if p_end > highest_channel_p_return:
				highest_channel_p_return = p_end
			p_end = note_event.p_start
		else:
			channel_loop_p_returns.append(-1)
			channel_loop_p_lengths.append(0)

		if p_end > longest_channel_p_end:
			longest_channel_p_end = p_end
			longest_channel_idx = channel

	var target_pulse_length = longest_channel_p_end + 200
	var target_time_length = curve_master_tempo.get_integral(target_pulse_length)

	# Second pass - encode the notes with the now-known global tempo and volume curves
	var data := PoolByteArray()
	for channel in self.num_tracks:
		var events = all_note_events[channel]
		var loop_return_note_event_idx = -1
		var loop_return_p = channel_loop_p_returns[channel]
		var curve_pan: TrackCurve = curve_channel_pans[channel]

		var midi_events_bytes_t_start := StreamPeerBuffer.new()
		var midi_events_bytes_t_end := StreamPeerBuffer.new()
		var midi_events_bytes3 := StreamPeerBuffer.new()
		var midi_events_bytes_adsr := StreamPeerBuffer.new()

		var num_notes: int = 0
		var event_ptr := 0
		var l_events := len(events)
		var loop_p_offset := 0
		for i in MAX_NOTE_EVENTS:
			if event_ptr >= l_events:
				break
			if (loop_return_p >= 0) and event_ptr == l_events-1:
				event_ptr = loop_return_note_event_idx
				loop_p_offset += channel_loop_p_lengths[channel]
			var event: NoteEvent = events[event_ptr]
			var p = event.p_start
			if loop_return_note_event_idx < 0 and p >= loop_return_p:
				loop_return_note_event_idx = event_ptr
			midi_events_bytes_t_start.put_32(int(curve_master_tempo.get_integral(p + loop_p_offset) * 32000))
			midi_events_bytes_t_end.put_32(int(curve_master_tempo.get_integral(event.p_end + loop_p_offset) * 32000))  # t_end
			midi_events_bytes3.put_u8(event.instrument)
			midi_events_bytes3.put_u8(event.pitch)
			midi_events_bytes3.put_u8(int(event.velocity * curve_master_volume.get_pulse(p) * 255.0))  # velocity
			midi_events_bytes3.put_u8(int((curve_pan.get_pulse(p)+1.0) * 127.5))  # pan
			midi_events_bytes_adsr.put_u8(event.adsr_attack)
			midi_events_bytes_adsr.put_u8(event.adsr_decay)
			midi_events_bytes_adsr.put_u8(event.adsr_sustain)
			midi_events_bytes_adsr.put_u8(event.adsr_release)

			event_ptr += 1
			num_notes += 1
		# Fill up end of notes array with dummies
		for i in range(num_notes, MAX_NOTE_EVENTS):
			midi_events_bytes_t_start.put_32(0x0FFFFFFF)
			midi_events_bytes_t_end.put_32(0x0FFFFFFF)
			midi_events_bytes3.put_32(0)
			midi_events_bytes_adsr.put_32(0)
		data += midi_events_bytes_t_start.data_array + midi_events_bytes_t_end.data_array + midi_events_bytes3.data_array + midi_events_bytes_adsr.data_array
	var smp_loop_start = -1
	var smp_loop_end = -1
	if highest_channel_p_return > 0:
		smp_loop_start = curve_master_tempo.get_integral(highest_channel_p_return + 100) * 32000
		smp_loop_end = curve_master_tempo.get_integral(longest_channel_p_end + 100) * 32000
	return [data, target_time_length, [smp_loop_start, smp_loop_end]]

func print_channel_events(inst_map: Array) -> void:
	for channel in self.num_tracks:
		print('================Channel %d================'%channel)
		var track: Array = self.tracks[channel]
		var l := len(track)
		var p := 0  # current pulse
		for event in track:  #num_notes < MAX_NOTE_EVENTS:
			var print_str := 'p=%6d : %s '%[p, EventType.keys()[event[0]]]
			match event[0]:
				EventType.NOTE:
					var note = event[1]
					var duration = event[2]
					match note:
						music.NOTE_IS_REST:
							print('p=%6d : NOTE_REST %d pulses'%[p, duration])
						music.NOTE_IS_TIE:
							print('p=%6d : NOTE_TIE  %d pulses'%[p, duration])
						_:
							print(print_str, event.slice(1, -1))
					p += duration
				EventType.PROGCHANGE:
					var event_idx = event[1]-0x20
					if event_idx >= 0:
						print(print_str, ' instrument %02d'%(inst_map[event_idx] - 1))
					else:
						print(print_str, event.slice(1, -1))
				_:
					print(print_str, event.slice(1, -1))