Can someone please shed some light on why my DSP callback is not working?
Dim System As Long
Dim Sound As Long
Dim channel As Long
Private Function GetFunctionPointer(fptr As Long) As Long
GetFunctionPointer = fptr
Private Sub Form_Load()
Dim result As FMOD_RESULT
Dim channels As Long, frequency As Long
Dim version As Long
Dim dspUser As FMOD_DSP_DESCRIPTION Dim dsp As Long Dim exinfo As FMOD_CREATESOUNDEXINFO channels = 2 frequency = 44100 ' Global settings result = FMOD_System_Create(System) ERRCHECK (result) result = FMOD_System_GetVersion(System, version) ERRCHECK (result) If version <> FMOD_VERSION Then MsgBox "Error! You are using an old version of FMOD " & Hex$(version) & ". " & _ "This program requires " & Hex$(FMOD_VERSION) End If 'Setup DSP description properties dspUser.name = "Custom DSP" dspUser.version = 1 dspUser.channels = 0 dspUser.create = vbNull dspUser.release = vbNull dspUser.reset = vbNull dspUser.read = GetFunctionPointer(AddressOf DSPCallback) dspUser.setpos = vbNull 'Initialize FMOD result = FMOD_System_Init(System, 32, 32, FMOD_INIT_NORMAL, 0) ERRCHECK (result) 'Create stream from file result = FMOD_System_CreateStream(System, "C:\a.mp3", FMOD_SOFTWARE, exinfo, Sound) ERRCHECK (result) 'Play stream result = FMOD_System_PlaySound(System, FMOD_CHANNEL_FREE, Sound, 0, channel) ERRCHECK (result) 'Create the DSP result = FMOD_System_CreateDSP(System, dspUser, dsp) ERRCHECK (result) 'Add the DSP result = FMOD_System_AddDSP(System, dsp) ERRCHECK (result) 'Activate DSP result = FMOD_DSP_SetActive(dsp, 1) ERRCHECK (result)
Function DSPCallback(ByVal ptrDSP As Long, ptrInBuffer As Long, ptrOutBuffer As Long, dLength As Long, channelsInBuffer As Long, channelsOutBuffer As Long) As FMOD_RESULT
Debug.Print "DSP Callback"
At this point, I’m only really interested in getting it to fire using FMODEx. Or, if there is a better way to accomplish what I’m trying to do…I want to play a sound file on one computer and simultaneously stream the data to another computer on the network.
The solution I’ve come up with is to grab the buffer from the DSP callback, push it out the network and read it into a user created stream on the other PC(s). However, I’m having some issues getting the DSP callback working with Ex and VB6.
Additionally, is the DSP buffer still raw PCM data in Ex? Can it be fed directly into a user-created stream read callback?
Thanks in advance,
- dreicher asked 14 years ago
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