vst audio buffers | Synth Book Questions | Forum

Quick question on VST audio buffers, I've used this in audio effects without any issue. However, not been able to get working with Synth projects works ok in RACKAFX but not in DAW just makes no sound (Ableton & Reaper). Compiled as VST and tried using the RACKAFX DLL that rackafx produces. 

Have  m_bWantVSTBuffers = true;  set in DXSYNTH.CPP. Commented out the process audio frame code as well.

 

Below is a quick example code for testing, for the DX synth works ok in Rackafx but not in DAW.

 

Also unrelated but do you know how I get a VST code from steinberg or AU code from Apple ? 

 

bool __stdcall CDXSynth::processVSTAudioBuffer(float** inBuffer, float** outBuffer, UINT uNumChannels, int inFramesToProcess)
{

smoothParameterValues();

 

float* pOutputL = outBuffer[0];
float* pOutputR= outBuffer[1];

while (--inFramesToProcess >= 0)
{

double dLeftAccum = 0.0;
double dRightAccum = 0.0;

float fMix = 0.25;
double dLeft = 0.0;
double dRight = 0.0;

// --- loop and accumulate voices
for (int i = 0; i<MAX_VOICES; i++)
{
// --- render synth
if (m_pVoiceArray[i])
m_pVoiceArray[i]->doVoice(dLeft, dRight);

// --- accumulate and scale
dLeftAccum += fMix*dLeft;
dRightAccum += fMix*dRight;
}

// Left channel processing
*pOutputL = dLeftAccum;

// If there is a right channel
//if(pInputR)
*pOutputR = dRightAccum;

// advance pointers
//pInputL++;
pOutputL++;
//if(pInputR) pInputR++;
if(pOutputR) pOutputR++;
}
// all OK
return true;
}

Regards

 

Mark