291 lines
7.2 KiB
GDScript
291 lines
7.2 KiB
GDScript
"""
|
|
MOD reader by あるる（きのもと 結衣） @arlez80
|
|
|
|
MIT License
|
|
"""
|
|
|
|
class_name Mod
|
|
|
|
const period_table:PoolIntArray = PoolIntArray([
|
|
1712,1616,1525,1440,1357,1281,1209,1141,1077,1017, 961, 907,
|
|
856, 808, 762, 720, 678, 640, 604, 570, 538, 508, 480, 453,
|
|
428, 404, 381, 360, 339, 320, 302, 285, 269, 254, 240, 226,
|
|
214, 202, 190, 180, 170, 160, 151, 143, 135, 127, 120, 113,
|
|
107, 101, 95, 90, 85, 80, 76, 71, 67, 64, 60, 57,
|
|
])
|
|
|
|
enum ModFlags {
|
|
LINEAR_FREQUENCY_TABLE = 1,
|
|
}
|
|
|
|
enum ModWaveFormType {
|
|
SINE_WAVEFORM = 0,
|
|
SAW_WAVEFORM = 1,
|
|
SQUARE_WAVEFORM = 2,
|
|
RAMDOM_WAVEFORM = 3,
|
|
REV_SAW_WAVEFORM = 4,
|
|
}
|
|
|
|
enum ModLoopType {
|
|
NO_LOOP = 0,
|
|
FORWARD_LOOP = 1,
|
|
PING_PONG_LOOP = 2,
|
|
}
|
|
|
|
class ModData:
|
|
var module_name:String
|
|
var tracker_name:String
|
|
var version:int
|
|
var flags:int = 0
|
|
|
|
var song_length:int
|
|
var unknown_number:int
|
|
var channel_count:int
|
|
var song_positions:Array # int
|
|
var magic:String
|
|
var patterns:Array # ModPattern[][]
|
|
var instruments:Array # ModInstrument[]
|
|
|
|
var init_tick:int = 6
|
|
var init_bpm:int = 125
|
|
var restart_position:int = 0
|
|
|
|
class ModPatternNote:
|
|
var key_number:int
|
|
var note:int
|
|
var instrument:int
|
|
var volume:int = 0
|
|
var effect_command:int
|
|
var effect_param:int
|
|
|
|
class ModInstrument:
|
|
var name:String
|
|
var samples:Array # ModSample[96]
|
|
var volume_envelope:ModEnvelope
|
|
var panning_envelope:ModEnvelope
|
|
var vibrato_type:int = -1 # ModWaveFormType
|
|
var vibrato_speed:int = -1
|
|
var vibrato_depth:int = -1
|
|
var vibrato_depth_shift:int = -1
|
|
var volume_fadeout:int = -1
|
|
|
|
class ModSample:
|
|
var data:PoolByteArray
|
|
var name:String
|
|
var length:int
|
|
var loop_start:int
|
|
var loop_length:int
|
|
var volume:int
|
|
var finetune:int
|
|
var loop_type:int = ModLoopType.FORWARD_LOOP # set(ModLoopType)
|
|
var bit:int = 8 # 8 or 16
|
|
var panning:int = -1
|
|
var relative_note:int = 0
|
|
|
|
class ModEnvelope:
|
|
var points:Array # ModEnvelopePoint[12]
|
|
var point_count:int
|
|
var sustain_point:int
|
|
var loop_start_point:int
|
|
var loop_end_point:int
|
|
|
|
var enabled:bool
|
|
var sustain_enabled:bool
|
|
var loop_enabled:bool
|
|
|
|
func set_flag( f:int ):
|
|
self.enabled = ( f & 1 ) != 0
|
|
self.sustain_enabled = ( f & 2 ) != 0
|
|
self.loop_enabled = ( f & 4 ) != 0
|
|
|
|
class ModEnvelopePoint:
|
|
var frame:int
|
|
var value:int
|
|
|
|
class ModParseResult:
|
|
var error:int = OK
|
|
var data:ModData = null
|
|
|
|
func _init( ):
|
|
pass
|
|
|
|
"""
|
|
ファイルから読み込み
|
|
|
|
@param path ファイルパス
|
|
@return 読んだ Modファイルデータ
|
|
"""
|
|
func read_file( path:String ) -> ModParseResult:
|
|
var f:File = File.new( )
|
|
var result: = ModParseResult.new( )
|
|
|
|
var err:int = f.open( path, f.READ )
|
|
if err != OK:
|
|
result.error = err
|
|
return result
|
|
|
|
var stream:StreamPeerBuffer = StreamPeerBuffer.new( )
|
|
stream.set_data_array( f.get_buffer( f.get_len( ) ) )
|
|
stream.big_endian = true
|
|
f.close( )
|
|
|
|
result.data = self._read( stream )
|
|
return result
|
|
|
|
"""
|
|
配列から読み込み
|
|
|
|
@param data データ
|
|
@return ModData
|
|
"""
|
|
func read_data( data:PoolByteArray ) -> ModParseResult:
|
|
var stream:StreamPeerBuffer = StreamPeerBuffer.new( )
|
|
stream.set_data_array( data )
|
|
stream.big_endian = true
|
|
|
|
var result: = ModParseResult.new( )
|
|
result.data = self._read( stream )
|
|
return result
|
|
|
|
"""
|
|
ストリームから読み込み
|
|
|
|
@param stream ストリーム
|
|
@return 読んだ Modファイルデータ
|
|
"""
|
|
func _read( stream:StreamPeerBuffer ) -> ModData:
|
|
var mod: = ModData.new( )
|
|
mod.module_name = self._read_string( stream, 20 )
|
|
mod.tracker_name = ""
|
|
mod.instruments = self._read_instruments( stream )
|
|
mod.song_length = stream.get_u8( )
|
|
mod.unknown_number = stream.get_u8( )
|
|
mod.song_positions = stream.get_partial_data( 128 )[1]
|
|
var max_song_position:int = 0
|
|
for sp in mod.song_positions:
|
|
if max_song_position < sp:
|
|
max_song_position = sp
|
|
|
|
mod.magic = self._read_string( stream, 4 )
|
|
var channel_count:int = 4
|
|
match mod.magic:
|
|
"6CHN":
|
|
channel_count = 6
|
|
"FLT8", "8CHN", "CD81", "OKTA":
|
|
channel_count = 8
|
|
"16CN":
|
|
channel_count = 16
|
|
"32CN":
|
|
channel_count = 32
|
|
_:
|
|
if mod.magic.substr( 2 ) == "CH":
|
|
channel_count = int( mod.magic )
|
|
# print( "Unknown magic" )
|
|
# breakpoint
|
|
pass
|
|
mod.channel_count = channel_count
|
|
|
|
mod.patterns = self._read_patterns( stream, max_song_position + 1, channel_count )
|
|
self._read_sample_data( stream, mod.instruments )
|
|
|
|
return mod
|
|
|
|
"""
|
|
楽器データを読み込む
|
|
|
|
@param stream ストリーム
|
|
@return 楽器データ
|
|
"""
|
|
func _read_instruments( stream:StreamPeerBuffer ) -> Array: # of ModSample
|
|
var instruments:Array = []
|
|
|
|
for i in range( 31 ):
|
|
var sample: = ModSample.new( )
|
|
sample.name = self._read_string( stream, 22 )
|
|
sample.length = stream.get_u16( ) * 2
|
|
var finetune:int = stream.get_u8( ) & 0x0F
|
|
if 0x08 < finetune:
|
|
finetune = finetune - 0x10
|
|
sample.finetune = finetune * 16
|
|
sample.volume = stream.get_u8( )
|
|
sample.loop_start = stream.get_u16( ) * 2
|
|
sample.loop_length = stream.get_u16( ) * 2
|
|
if sample.loop_length < 8:
|
|
sample.loop_type = ModLoopType.NO_LOOP
|
|
else:
|
|
sample.loop_type = ModLoopType.FORWARD_LOOP
|
|
|
|
var instrument: = ModInstrument.new( )
|
|
instrument.name = sample.name
|
|
instrument.samples = []
|
|
for k in range( 96 ):
|
|
instrument.samples.append( sample )
|
|
instrument.volume_envelope = ModEnvelope.new( )
|
|
instrument.volume_envelope.enabled = false
|
|
instrument.panning_envelope = ModEnvelope.new( )
|
|
instrument.panning_envelope.enabled = false
|
|
|
|
instruments.append( instrument )
|
|
|
|
return instruments
|
|
|
|
"""
|
|
パターンを読み込む
|
|
|
|
@param stream ストリームデータ
|
|
@param max_positions 最大パターン数
|
|
@param channels 最大チャンネル数
|
|
@return パターンデータ
|
|
"""
|
|
func _read_patterns( stream:StreamPeerBuffer, max_position:int, channels:int ) -> Array:
|
|
var patterns:Array = []
|
|
|
|
for position in range( 0, max_position ):
|
|
var pattern:Array = []
|
|
for i in range( 0, 64 ):
|
|
var line:Array = []
|
|
for ch in range( 0, channels ):
|
|
var v1:int = stream.get_u16( )
|
|
var v2:int = stream.get_u16( )
|
|
var mod_pattern_note: = ModPatternNote.new( )
|
|
mod_pattern_note.instrument = ( ( v1 >> 8 ) & 0xF0 ) | ( ( v2 >> 12 ) & 0x0F )
|
|
mod_pattern_note.key_number = v1 & 0x0FFF
|
|
mod_pattern_note.effect_command = ( v2 >> 8 ) & 0x0F
|
|
mod_pattern_note.effect_param = v2 & 0x0FF
|
|
# TODO: 遅かったら二分探索にでもしませんか
|
|
if 0 < mod_pattern_note.key_number:
|
|
mod_pattern_note.note = 23
|
|
for k in period_table:
|
|
mod_pattern_note.note += 1
|
|
if k <= mod_pattern_note.key_number:
|
|
break
|
|
else:
|
|
mod_pattern_note.note = 0
|
|
line.append( mod_pattern_note )
|
|
pattern.append( line )
|
|
patterns.append( pattern )
|
|
|
|
return patterns
|
|
|
|
"""
|
|
楽器のデータに基づき、波形を読み込む
|
|
|
|
@param stream ストリーム
|
|
@param instruments 波形を読み込む楽器データリスト
|
|
"""
|
|
func _read_sample_data( stream:StreamPeerBuffer, instruments:Array ) -> void:
|
|
for instrument in instruments:
|
|
var sample:Mod.ModSample = instrument.samples[0]
|
|
if 0 < sample.length:
|
|
sample.data = stream.get_partial_data( sample.length )[1]
|
|
|
|
"""
|
|
文字列の読み込み
|
|
|
|
@param stream ストリーム
|
|
@param size 文字列サイズ
|
|
@return 読み込んだ文字列を返す
|
|
"""
|
|
func _read_string( stream:StreamPeerBuffer, size:int ) -> String:
|
|
return stream.get_partial_data( size )[1].get_string_from_ascii( )
|