I’ve been trying to get the scope to work but it wont!
I followed Paranoid Android’s example but all I get is a
goofy looking scope. I tried to do every thing the same,
but all I get is a wave form that looks blocky and stupid. 😡
If you can help I would be greatful!
- nci asked 15 years ago
[quote:2u0k7lai] Anonymous wrote:
do you play guitar?
Do you know much about scales? Either way, would you like to take a look at a paper i’m working on… i found a cool pattern behind it and i wanna see if people know of it
- coolbeans answered 15 years ago
I’m still learning to play the guitar, but yeah I can play scales. I’ve only been playing for a couple years. What pattern? There are a few patterns I know of, A, G, E, D, and C, which are all scale forms made from those chords, then you have the major and minor pentatonic 5 note scale, and the major and minor 7 note scales.
Ok, Here it is:
Public Sub SpectrumEnable(blnValue As Boolean)
'Set up the Scope ReDim sngScopeData(0 To FSOUND_DSP_GetBufferLength) As Single lngScopeUnit = FSOUND_DSP_Create(AddressOf ScopeCallback, FSOUND_DSP_DEFAULTPRIORITY_USER + 3, 0) FSOUND_DSP_SetActive FSOUND_DSP_GetFFTUnit, blnValue FSOUND_DSP_SetActive lngScopeUnit, blnValue blnSpectrumOn = blnValue 'Reset the display SpectrumClear
‘The scope callback:
Public Function ScopeCallback(ByVal originalbuffer As Long, ByVal newbuffer As Long, ByVal length As Long, ByVal param As Long) As Long
lngScopeBuffer = newbuffer ScopeCallback = newbuffer
Public Function GetScopeFPU(ByRef Scope() As Single)
On Error Resume Next
Dim nrOfVals As Long
If UBound(Scope) > 1023 Then nrOfVals = 1024 Else nrOfVals = UBound(Scope) + 1 CopyMemory Scope(0), ByVal lngScopeBuffer, nrOfVals * 4
Dim point As PointAPI SpectrumClear True MoveToEx picSpec.hdc, 0, (picSpec.Height / 2), point picSpec.ForeColor = vbRed Call GetScopeFPU(sngScopeData) For intX = 0 To FSOUND_DSP_GetBufferLength / 16 LineTo picSpec.hdc, intX * (picSpec.ScaleWidth / (FSOUND_DSP_GetBufferLength / 16)), (picSpec.ScaleHeight / 2) + (sngScopeData(intX * 16) * (picSpec.ScaleHeight / 100000)) Next intX picSpec.Refresh
Hmm. I have the same problems.
Setting the mixer to an FPU based mixer->Everything runs fine and I can see my scope, but when I change it to an MMX based mixer it doesn’t look well at all
I have tried to add some handling in the scope callback so that if an MMX mixer is used, I put the scope data into an interger buffer instead of a single buffer, but that doesn’t works neither.
Any tips somone?
(I’m using Delphi btw.)
Thanks in advance,
I’m not sure why it would crash on you. I noticed that when
I added the DSP callback for scope my player became very
unstable. If I were to paste a large picture in paint the sound
would skip and the program would crash. It would also just randomly
crash during a song. But I am able to run it and have it work, but the
scope doesn’t work. maybe I’m overlooking a small detail somewhere.
You have to initialize and terminate like normal. but that is basically all.
I can send you a pre-made test program for the ocx control.
Well, I dont really see anything wrong with the code, try messing around with the numbers in LineTo, I had to mess around with it a bit before it looked good. Try changing the 16 to 8 or 24 or whatever makes it look more smooth.
If you are dealing with a RECT than you can use the InvalidateRect API, which can work the same as DoEvents, but when using InvalideRect dont use AutRedraw on your pricturebox. I’m pretty sure that will work.
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