59 lines
2.1 KiB
QBasic
59 lines
2.1 KiB
QBasic
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Attribute VB_Name = "modSynth"
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'//////////////////////////////////////////////////////////////////////////////
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' modSynth.bas - Copyright (c) 2006-2007 (: JOBnik! :) [Arthur Aminov, ISRAEL]
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' [http://www.jobnik.org]
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' [ jobnik@jobnik.org ]
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'
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' Other source: frmSynth.frm
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'
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' BASS Simple Synth
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' Originally translated from - synth.c - Example of Ian Luck
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'//////////////////////////////////////////////////////////////////////////////
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Option Explicit
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Public info As BASS_INFO
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Public Const PI = 3.14159265358979
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Public Const TABLESIZE = 2048
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Public sinetable(TABLESIZE) As Long ' sine table
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Public Const KEYS_ = 20
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Public keys As Variant
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Public Const MAXVOL = 4000 ' higher value = longer fadeout
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Public vol(KEYS_) As Long, pos(KEYS_) As Long ' keys' volume & pos
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Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal length As Long)
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' stream writer
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Public Function WriteStream(ByVal handle As Long, ByVal buffer As Long, ByVal length As Long, ByVal user As Long) As Long
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Dim n As Long, s As Long, c As Long
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Dim f As Single
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Dim buf() As Integer
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ReDim buf(length) As Integer
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For n = 0 To KEYS_ - 1
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If (vol(n)) Then
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f = (2 ^ ((n + 3) / 12#)) * TABLESIZE * 440# / info.freq
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c = 0
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Do While (c < length / 4 And vol(n))
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s = sinetable((pos(n) * f) And (TABLESIZE - 1)) * vol(n) / MAXVOL
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pos(n) = pos(n) + 1
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s = s + buf(c * 2)
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' clip
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If (s > 32767) Then s = 32767
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If (s < -32768) Then s = -32768
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' left and right channels are the same
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buf(c * 2) = s
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buf(c * 2 + 1) = s
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If (vol(n) < MAXVOL) Then vol(n) = vol(n) - 1
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c = c + 1
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Loop
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End If
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Next n
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Call CopyMemory(ByVal buffer, buf(0), length)
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WriteStream = length
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End Function
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