editor/bass-sys/win/bass24/vb/CustLoop/modCustLoop.bas

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2021-01-05 10:17:41 +00:00
Attribute VB_Name = "modCustLoop"
'/////////////////////////////////////////////////////////////////////////////////
' modCustLoop.bas - Copyright (c) 2004-2007 (: JOBnik! :) [Arthur Aminov, ISRAEL]
' [http://www.jobnik.org]
' [ jobnik@jobnik.org ]
' Other source: frmCustLoop.frm
'
' BASS custom looping example
' Originally translated from - custloop.c - Example of Ian Luck
'/////////////////////////////////////////////////////////////////////////////////
Option Explicit
Public Const BI_RGB = 0&
Public Const DIB_RGB_COLORS = 0& ' color table in RGBs
Public Type BITMAPINFOHEADER
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Public Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbReserved As Byte
End Type
Public Type BITMAPINFO
bmiHeader As BITMAPINFOHEADER
bmiColors(255) As RGBQUAD
End Type
Public Declare Function SetDIBitsToDevice Lib "gdi32.dll" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal dx As Long, ByVal dy As Long, ByVal SrcX As Long, ByVal SrcY As Long, ByVal Scan As Long, ByVal NumScans As Long, Bits As Any, BitsInfo As BITMAPINFO, ByVal wUsage As Long) As Long
Public Const TRANSPARENT = 1
Public Const TA_LEFT = 0
Public Const TA_RIGHT = 2
Public Declare Function SetTextColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Public Declare Function SetBkMode Lib "gdi32" (ByVal hdc As Long, ByVal nBkMode As Long) As Long
Public Declare Function SetTextAlign Lib "gdi32" (ByVal hdc As Long, ByVal wFlags As Long) As Long
Public Declare Function TextOut Lib "gdi32" Alias "TextOutA" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal lpString As String, ByVal nCount As Long) As Long
Public Const WIDTH_ = 600 ' display width
Public Const HEIGHT_ = 201 ' height (odd number for centre line)
Public bpp As Long ' stream bytes per pixel
Public loop_(2) As Long ' loop start & end
Public lsync As Long ' looping sync
Public killscan As Boolean
Public wavebuf() As Byte ' wave buffer
Public chan As Long ' stream/music handle
Public bh As BITMAPINFO ' bitmap header
' display error messages
Public Sub Error_(ByVal es As String)
Call MsgBox(es & vbCrLf & vbCrLf & "error code: " & BASS_ErrorGetCode, vbExclamation, "Error")
End Sub
Sub LoopSyncProc(ByVal handle As Long, ByVal channel As Long, ByVal data As Long, ByVal user As Long)
If (BASS_ChannelSetPosition(channel, loop_(0), BASS_POS_BYTE) = 0) Then ' try seeking to loop start
Call BASS_ChannelSetPosition(channel, 0, BASS_POS_BYTE) ' failed, go to start of file instead
End If
End Sub
Sub SetLoopStart(ByVal pos As Long)
loop_(0) = pos
End Sub
Sub SetLoopEnd(ByVal pos As Long)
loop_(1) = pos
Call BASS_ChannelRemoveSync(chan, lsync) ' remove old sync
lsync = BASS_ChannelSetSync(chan, BASS_SYNC_POS Or BASS_SYNC_MIXTIME, loop_(1), AddressOf LoopSyncProc, 0) ' set new sync
End Sub
' scan the peaks
Sub ScanPeaks(ByVal decoder As Long)
ReDim wavebuf(-120600 To 120600) As Byte ' set 'n clear the buffer (600 x 201 = 120600)
Dim cpos As Long, peak(2) As Long
Do While (Not killscan)
Dim Level As Long, pos As Long
Level = BASS_ChannelGetLevel(decoder) ' scan peaks
pos = BASS_ChannelGetPosition(decoder, BASS_POS_BYTE) / bpp
If (peak(0) < LoWord(Level)) Then peak(0) = LoWord(Level) ' set left peak
If (peak(1) < HiWord(Level)) Then peak(1) = HiWord(Level) ' set right peak
If (BASS_ChannelIsActive(decoder) = 0) Then
pos = -1 ' reached the end
Else
pos = BASS_ChannelGetPosition(decoder, BASS_POS_BYTE) / bpp
End If
If (pos > cpos) Then
Dim a As Long
For a = 0 To (peak(0) * (HEIGHT_ / 2) / 32768) - 1
' draw left peak
wavebuf(IIf((HEIGHT_ / 2 - 1 - a) * WIDTH_ + cpos > 120600, 120600, (HEIGHT_ / 2 - 1 - a) * WIDTH_ + cpos)) = 1 + a
Next a
For a = 0 To (peak(1) * (HEIGHT_ / 2) / 32768) - 1
' draw right peak
wavebuf(IIf((HEIGHT_ / 2 + 1 + a) * WIDTH_ + cpos > 120600, 120600, (HEIGHT_ / 2 + 1 + a) * WIDTH_ + cpos)) = 1 + a
Next a
If (pos >= WIDTH_) Then Exit Do ' gone off end of display
cpos = pos
peak(0) = 0
peak(1) = 0
End If
DoEvents
Loop
Call BASS_StreamFree(decoder) ' free the decoder
End Sub
' select a file to play, and start scanning it
Function PlayFile() As Boolean
On Local Error Resume Next ' if Cancel pressed...
With frmCustLoop.cmdCustLoop
.CancelError = True
.flags = cdlOFNExplorer Or cdlOFNFileMustExist Or cdlOFNHideReadOnly
.DialogTitle = "Select a file to play"
.Filter = "Playable files|*.mp3;*.mp2;*.mp1;*.ogg;*.wav;*.aif;*.mo3;*.it;*.xm;*.s3m;*.mtm;*.mod;*.umx|All files|*.*"
.ShowOpen
' if cancel was pressed, exit the procedure
If Err.Number = 32755 Then Exit Function
chan = BASS_StreamCreateFile(BASSFALSE, StrPtr(.filename), 0, 0, 0)
If (chan = 0) Then chan = BASS_MusicLoad(BASSFALSE, StrPtr(.filename), 0, 0, BASS_MUSIC_RAMPS Or BASS_MUSIC_POSRESET Or BASS_MUSIC_PRESCAN, 1)
If (chan = 0) Then
Call Error_("Can't play file")
PlayFile = False ' Can't load the file
Exit Function
End If
frmCustLoop.Show ' show form
With bh.bmiHeader
.biSize = Len(bh.bmiHeader)
.biWidth = WIDTH_
.biHeight = -HEIGHT_
.biPlanes = 1
.biBitCount = 8
.biClrUsed = HEIGHT_ / 2 + 1
.biClrImportant = HEIGHT_ / 2 + 1
End With
' setup palette
Dim a As Byte
For a = 1 To HEIGHT_ / 2
bh.bmiColors(a).rgbRed = (255 * a) / (HEIGHT_ / 2)
bh.bmiColors(a).rgbGreen = 255 - bh.bmiColors(a).rgbRed
Next a
bpp = BASS_ChannelGetLength(chan, BASS_POS_BYTE) / WIDTH_ ' bytes per pixel
If (bpp < BASS_ChannelSeconds2Bytes(chan, 0.02)) Then ' minimum 20ms per pixel (BASS_ChannelGetLevel scans 20ms)
bpp = BASS_ChannelSeconds2Bytes(chan, 0.02)
End If
lsync = BASS_ChannelSetSync(chan, BASS_SYNC_END Or BASS_SYNC_MIXTIME, 0, AddressOf LoopSyncProc, 0) ' set sync to loop at end
Call BASS_ChannelPlay(chan, BASSFALSE) ' start playing
frmCustLoop.tmrCustLoop.Enabled = True ' timer's interval is 100ms (10Hz)
Dim chan2 As Long
chan2 = BASS_StreamCreateFile(BASSFALSE, StrPtr(.filename), 0, 0, BASS_STREAM_DECODE)
If (chan2 = 0) Then chan2 = BASS_MusicLoad(BASSFALSE, StrPtr(.filename), 0, 0, BASS_MUSIC_DECODE, 1)
Call ScanPeaks(chan2) ' start scanning peaks
End With
PlayFile = True
End Function
Sub DrawTimeLine(ByVal dc As Long, ByVal pos As Long, ByVal col As Long, ByVal Y As Long)
Dim wpos As Long
wpos = pos / bpp
Dim time As Long
time = BASS_ChannelBytes2Seconds(chan, pos)
Dim text As String
text = time \ 60 & ":" & Format(time Mod 60, "00")
frmCustLoop.CurrentX = wpos
frmCustLoop.Line (wpos, 0)-(wpos, HEIGHT_ - 1), col
Call SetTextColor(dc, col)
Call SetBkMode(dc, TRANSPARENT)
Call SetTextAlign(dc, IIf(wpos >= WIDTH_ / 2, TA_RIGHT, TA_LEFT))
Call TextOut(dc, wpos, Y, text, Len(text))
End Sub