notdraimdev
145 lines
4.0 KiB
GDScript
145 lines
4.0 KiB
GDScript
extends Node
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class_name MusicMeta
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class MusicMetadata:
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var error: Error
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var bpm: int
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var title: String
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var album: String
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var comments: String
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var year: int
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var artist: String
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var cover: ImageTexture
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func print_info():
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print("bpm: ", bpm)
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print("title: ", title)
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print("album: ", album)
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print("comments: ", comments)
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print("year: ", year)
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print("cover: ", cover)
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print("artist: ", artist)
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func get_mp3_metadata(stream: AudioStreamMP3) -> MusicMetadata:
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var meta: MusicMetadata = MusicMetadata.new()
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var data: PackedByteArray = stream.data
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meta.error = OK
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if data.size() < 10:
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meta.error = FAILED
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return meta
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var header = data.slice(0, 10)
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var id = header.slice(0, 3).get_string_from_ascii()
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if id != "ID3":
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meta.error = FAILED
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push_error("Error: Stream data's header '%s' is not ID3."%id)
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return meta
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var v = "ID3v2.%d.%d" % [header[3], header[4]]
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if v == "ID3v2.4.0" or v == "ID3v2.3.0":
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var flags = header[5]
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var _unsync = flags & 0x80 > 0
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var extended = flags & 0x40 > 0
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var _experimental = flags & 0x20 > 0
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var _has_footer = flags & 0x10 > 0
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var idx = 10
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var end = idx + bytes_to_int(header.slice(6, 10))
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if extended:
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idx += bytes_to_int(data.slice(idx, idx + 4))
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while idx < end:
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if not data:
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meta.error = FAILED
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push_error("Error: Stream data is null.")
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return meta
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var frame_id = data.slice(idx, idx + 4).get_string_from_ascii()
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var size = bytes_to_int(data.slice(idx + 4, idx + 8), frame_id != "APIC")
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# if greater than byte, not sync safe number (0b0111_1111 -> 0x7f)
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if size > 0x7f:
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size = bytes_to_int(data.slice(idx + 4, idx + 8), false)
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idx += 10
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match frame_id:
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"TBPM", 'TBP':
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meta.bpm = int(get_string_from_data(data, idx, size))
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"TIT2":
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print("a " + str(Array(data.slice(idx, idx + 3)).hash()))
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print([1, 0xff, 0xfe].hash())
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meta.title = get_string_from_data(data, idx, size)
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"TALB", 'TAL':
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meta.album = get_string_from_data(data, idx, size)
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"COMM":
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meta.comments = get_string_from_data(data, idx, size)
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"TYER":
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meta.year = int(get_string_from_data(data, idx, size))
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"TPE1", 'TP1':
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meta.artist = get_string_from_data(data, idx, size)
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"APIC","PIC":
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var pic_frame = data.slice(idx + 1, idx + size)
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var zero1 = pic_frame.find(0)
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if zero1 > 0:
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var mime_type = pic_frame.slice(0, zero1).get_string_from_ascii()
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zero1 += 1 # Picture type
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if zero1 < pic_frame.size():
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zero1 += 1
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if zero1 < pic_frame.size():
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var zero2 = pic_frame.find(0, zero1)
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var image_bytes = pic_frame.slice(zero2 + 1, pic_frame.size())
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var img = Image.new()
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match mime_type:
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"image/png":
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img.load_png_from_buffer(image_bytes)
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"image/jpeg", "image/jpg":
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img.load_jpg_from_buffer(image_bytes)
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_:
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meta.error = FAILED
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push_error("MusicMeta.get_metadata_mp3(): ERROR: mime type ", mime_type, " not yet supported...")
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return meta
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var t: ImageTexture = ImageTexture.new()
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t.set_image(img)
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meta.cover = t
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idx += size
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return meta
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else:
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meta.error = FAILED
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push_error("Error: Found version '%s' from streams data; must be 'ID3v2.4.0'."%v)
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return meta
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func get_string_from_data(data, idx, size):
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var ret
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if size > 3 and Array(data.slice(idx, idx + 3)).hash() == [1, 0xff, 0xfe].hash():
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# Null-terminated string of ucs2 chars
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ret = get_string_from_ucs2(data.slice(idx + 3, idx + size))
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if data[idx] == 0:
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# Simple utf8 string
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ret = data.slice(idx + 1, idx + size).get_string_from_utf8()
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if ret:
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return ret
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else:
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return ""
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# Syncsafe uses 0x80 multiplier otherwise use 0x100 multiplier
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func bytes_to_int(bytes: Array, is_syncsafe = true):
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var mult = 0x80 if is_syncsafe else 0x100
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var n = 0
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for byte in bytes:
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n *= mult
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n += byte
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return n
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func get_string_from_ucs2(bytes: Array):
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var s = ""
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var idx = 0
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while idx < (bytes.size() - 1):
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s += char(bytes[idx] + 256 * bytes[idx + 1])
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idx += 2
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return s
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