ループとフェードアウトに対応させてみました。以下のスクリプトで（ほんとは設定ファイルがあると嬉しいけど、無くても）動きます。デフォルトでは「3分以下の曲は2周、それ以上の曲は1周で5.0秒フェードアウト」。これで音楽プレイヤーに取り込めます。この長さだとの MP3 エンコードなどは勘弁^^; そしていろいろな理由で遅いのは、お茶を飲みつつ気にしない方向で（汗）。
1: # 設定とか
2:
3: File_bgmlist = "bgmlist.txt"
4: File_option = "option.txt"
5:
6: class MusicAll
7: def initialize(filename)
8: @fadeout = 0
9: @loopcount = 1
10: @looptime = 180
11: @looptop = 1.0
12: @freq = 48000
13: @ch = 2
14: @bitdepth = 16
15: @ext_in = ".nwa"
16: @ext_out = ".wav"
17: @filelist = []
18:
19: if (FileTest.exist?(filename))
20: File.open(filename).each do |line|
21: line.gsub(/\s*#.+/, "")
22: if (line =~ /fadeout\s*=\s*([0-9\.]+)/)
23: @fadeout = $1.to_f
24: end
25: if (line =~ /loopcount\s*=\s*([0-9]+)/)
26: @loopcount = $1.to_i
27: end
28: if (line =~ /looptime\s*=\s*([0-9\.]+)/)
29: @looptime = $1.to_f
30: end
31: if (line =~ /freq\s*=\s*([0-9]+)/)
32: @freq = $1.to_i
33: end
34: if (line =~ /ch\s*=\s*([0-9\.]+)/)
35: @ch = $1.to_i
36: end
37: if (line =~ /bitdepth\s*=\s*([0-9]+)/)
38: @bitdepth = $1.to_i
39: end
40: if (line =~ /looptop\s*=\s*([0-9\.]+)/)
41: @looptop = $1.to_f
42: end
43: if (line =~ /extention\s*=\s*["']([^"']+)["']/)
44: @ext_in = $1
45: end
46: end
47: end
48: end
49:
50: def setList(filename)
51: if (FileTest.exist?(filename))
52: File.open(filename).each do |line|
53: @filelist.push(MusicEach.new(line, @ext_in, @ext_out))
54: end
55: else
56: Dir.glob("*" + @ext_in).each do |line|
57: @filelist.push(MusicEach.new(line.gsub(@ext_in, ""), @ext_in, @ext_out))
58: end
59: end
60: end
61:
62: def convertAll()
63: @filelist.each do |music|
64: printf(music.file_in + " -> " + music.file_out + " ... ")
65: if (! FileTest.exist?(music.file_in))
66: puts("fail (file not found)")
67: else
68: file = File.open(music.file_in, "rb")
69: str = file.read
70: file.close
71:
72: str[0, 44] = ""
73: blockalign = @ch * @bitdepth / 8
74:
75: # ループを入れる可能性あり
76: if (music.looptop >= @looptop * @freq)
77: # ループ処理
78: target = str[music.looptop*4 ..-1] # ループ対象
79: loopcount = [@loopcount, @looptime / ((str.length / 4.0 - music.looptop) / @freq)].min.ceil - 1
80: str += target * loopcount
81:
82: # フェードアウト処理
83: if (@fadeout > 0)
84: target = str[music.looptop*4, @fadeout * @freq * 4].unpack("s*")
85: countmax = target.length
86: count = 0
87: target.collect! do |x|
88: count += 1
89: (x * (1.0 - count.to_f / countmax)).to_i
90: end
91: str += target.pack("s*")
92: end
93: end
94: saveWav(music.file_out, str)
95: puts("OK")
96: end
97: end
98: end
99:
100: def saveWav(filename, str)
101:
102: blockalign = @ch * @bitdepth / 8
103:
104: head = []
105: head.push(["a4", "RIFF"]) # RIFF header
106: head.push(["V", str.length + 36]) # file size - 8
107: head.push(["a4", "WAVE"]) # WAVE header
108: head.push(["a4", "fmt "]) # fmt chank
109: head.push(["V", 16]) # fmt chank - size
110: head.push(["v", 1]) # WAVE_FORMAT_PCM
111: head.push(["v", @ch]) # channels
112: head.push(["V", @freq]) # sampling rate [Hz]
113: head.push(["V", blockalign * @freq]) # data rate [Byte]
114: head.push(["v", blockalign]) # block align [Byte]
115: head.push(["v", @bitdepth]) # bit per sample [bit]
116: # head.push(["v", 0]) # format info size [Byte]
117: head.push(["a4", "data"]) # data chank
118: head.push(["V", str.length]) # data chank - size
119:
120: file = File.open(filename, "wb")
121: head.each do |x|
122: file.write([x[1]].pack(x[0]))
123: end
124: file.write(str)
125: file.close
126: end
127: end
128:
129: class MusicEach
130: def initialize(str, ext_in, ext_out)
131: @file_in = @file_out = ""
132: @looptop = 0
133:
134: tmp = str.chop.split(/\t/)
135: if (tmp.length >= 3)
136: @file_in = tmp[0] + ext_in
137: @looptop = tmp[1].to_i
138: @file_out = tmp[2] + ext_out
139: else
140: @file_in = str + ext_in
141: @file_out = str + ext_out
142: end
143: end
144:
145: attr_reader :file_in, :file_out, :looptop
146: end
147:
148: album = MusicAll.new(File_option)
149: album.setList(File_bgmlist)
150: album.convertAll()
...さて、.rb だとインストールしている人が少ないだろう^^; ということで Exerb を使って exe 化してみました。そして BGM変換ツールをこっそりと公開。
