ladspaeffect.cpp

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      if (right && outputs > 1) {
         for (i = 0; i < block; i++)
            buffer[i] = fOutBuffer[1][i];
         right->Set((samplePtr)buffer, floatSample, rs, block);
      }      

      len -= block;
      ls += block;
      rs += block;
      
      if (inputs > 1) {
         if (TrackGroupProgress(count, (ls-lstart)/(double)originalLen))
            return false;
      }
      else {
         if (TrackProgress(count, (ls-lstart)/(double)originalLen))
            return false;
      }
   }

   if (mData->deactivate)
      mData->deactivate(handle);

   if (mData->cleanup)
      mData->cleanup(handle);

   return true;
}

void LadspaEffect::End()
{
   if (buffer) {
      unsigned long i;

      delete[]buffer;
      for (i = 0; i < inputs; i++) {
         delete fInBuffer[i];
      }
      for (i = 0; i < outputs; i++) {
         delete fOutBuffer[i];
      }

      delete[] fInBuffer;
      delete[] fOutBuffer;
   }
   buffer = NULL;
   fInBuffer = NULL;
   fOutBuffer = NULL;
}

const int LADSPA_SLIDER_ID = 13100;
const int LADSPA_TEXTCTRL_ID = 13101;
const int LADSPA_PREVIEW_ID = 13102;

BEGIN_EVENT_TABLE(LadspaEffectDialog, wxDialog)
    EVT_BUTTON(wxID_OK, LadspaEffectDialog::OnOK)
    EVT_BUTTON(wxID_CANCEL, LadspaEffectDialog::OnCancel)
    EVT_BUTTON(LADSPA_PREVIEW_ID, LadspaEffectDialog::OnPreview)
    EVT_SLIDER(LADSPA_SLIDER_ID, LadspaEffectDialog::OnSlider)
    EVT_TEXT(LADSPA_TEXTCTRL_ID, LadspaEffectDialog::OnTextCtrl)
END_EVENT_TABLE()

IMPLEMENT_CLASS(LadspaEffectDialog, wxDialog)

LadspaEffectDialog::LadspaEffectDialog(LadspaEffect *eff,
                                       wxWindow * parent,
                                       const LADSPA_Descriptor *data,
                                       float *inputControls,
                                       int sampleRate)
   :wxDialog(parent, -1, LAT1CTOWX(data->Name),
             wxDefaultPosition, wxDefaultSize,
             wxDEFAULT_DIALOG_STYLE),
    effect(eff)
{
   numParams = 0;
   this->mData = data;
   this->inputControls = inputControls;
   this->sampleRate = sampleRate;
	#ifdef __WXMSW__
		// On Windows, for some reason, wxWindows calls OnTextCtrl during creation
		// of the text control, and LadspaEffectDialog::OnTextCtrl calls HandleText, 
		// which assumes all the fields have been initialized. 
		// This can give us a bad pointer crash, so manipulate inSlider to 
		// no-op HandleText during creation.
		inSlider = true;
	#else
		inSlider = false;
	#endif
   inText = false;
   targetSlider = NULL;

   sliders = new wxSlider*[mData->PortCount];
   fields = new wxTextCtrl*[mData->PortCount];
	labels = new wxStaticText*[mData->PortCount];
   ports = new unsigned long [mData->PortCount];

   unsigned long p;
   for(p=0; p<mData->PortCount; p++) {
      LADSPA_PortDescriptor d = mData->PortDescriptors[p];
      if (LADSPA_IS_PORT_CONTROL(d) &&
          LADSPA_IS_PORT_INPUT(d)) {
         ports[numParams] = p;
         numParams++;
      }
   }

   wxBoxSizer *mainSizer = new wxBoxSizer(wxVERTICAL);
   wxControl *item;

   if (mData->Maker &&
       mData->Maker[0] && 
       LAT1CTOWX(mData->Maker) != wxString(_("None"))) {       
      item = new wxStaticText(this, 0,
                              wxString(_("Author: "))+LAT1CTOWX(mData->Maker));
      mainSizer->Add(item, 0, wxALL, 5);
   }
   
   if (mData->Copyright &&
       mData->Copyright[0] && 
       LAT1CTOWX(mData->Copyright) != wxString(_("None"))) {
      
      item = new wxStaticText(this, 0,
                              LAT1CTOWX(mData->Copyright));
      mainSizer->Add(item, 0, wxALL, 5);
   }

   wxSizer *paramSizer =
      new wxStaticBoxSizer(new wxStaticBox(this, -1,
                                           _("Effect Settings")),
                           wxVERTICAL );

   wxFlexGridSizer *gridSizer =
      new wxFlexGridSizer(3, 0, 0);

   for (p = 0; p < numParams; p++) {

      item = new wxStaticText(this, 0, wxString(mData->PortNames[ports[p]], wxConvISO8859_1));
      gridSizer->Add(item, 0, wxALIGN_CENTER_VERTICAL | wxALL, 5);

      wxString fieldText;
      LADSPA_PortRangeHint hint = mData->PortRangeHints[ports[p]];
      if (LADSPA_IS_HINT_INTEGER(hint.HintDescriptor))
         fieldText.Printf(wxT("%d"), (int)(inputControls[ports[p]] + 0.5));
      else
         fieldText.Printf(wxT("%f"), inputControls[ports[p]]);
      fields[p] = new wxTextCtrl(this, LADSPA_TEXTCTRL_ID, fieldText);
      gridSizer->Add(fields[p], 0, wxALL, 5);

      sliders[p] =
          new wxSlider(this, LADSPA_SLIDER_ID,
                       0, 0, 1000,
                       wxDefaultPosition,
                       wxSize(200, -1));
      gridSizer->Add(sliders[p], 0, wxALL, 5);
   }

   // Set all of the sliders based on the value in the
   // text fields
	inSlider = false; // Now we're ready for HandleText to actually do something.
   HandleText();
   
   paramSizer->Add(gridSizer, 1, wxALL, 5);
   mainSizer->Add(paramSizer, 1, wxALL, 5);

   wxBoxSizer *okSizer = new wxBoxSizer(wxHORIZONTAL);

   wxButton *button;

   button = new wxButton(this, LADSPA_PREVIEW_ID, effect->GetPreviewName());
   okSizer->Add(button, 0, wxALIGN_CENTRE | wxALL, 5);

   button = new wxButton(this, wxID_CANCEL, _("Cancel"));
   okSizer->Add(button, 0, wxALIGN_CENTRE | wxALL, 5);

   button = new wxButton(this, wxID_OK, _("OK"));
   button->SetDefault();
   button->SetFocus();
   okSizer->Add(button, 0, wxALIGN_CENTRE | wxALL, 5);

   mainSizer->Add(okSizer, 0, wxALIGN_CENTRE | wxALL, 5);

   SetAutoLayout(TRUE);
   SetSizer(mainSizer);
   mainSizer->Fit(this);
   mainSizer->SetSizeHints(this);
}

LadspaEffectDialog::~LadspaEffectDialog()
{
   delete[]sliders;
   delete[]fields;
   delete[]labels;
}

void LadspaEffectDialog::OnSlider(wxCommandEvent &event)
{
   targetSlider = (wxSlider *)event.GetEventObject();
   HandleSlider();
   targetSlider = NULL;
}

void LadspaEffectDialog::OnTextCtrl(wxCommandEvent & WXUNUSED(event))
{
	HandleText();
}

void LadspaEffectDialog::HandleSlider()
{
   // if we don't add the following three lines, changing
   // the value of the slider will change the text, which
   // will change the slider, and so on.  This gets rid of
   // the implicit loop.
   if (inText)
      return;
   inSlider = true;

   for (unsigned long p = 0; p < numParams; p++) {
      if (targetSlider && targetSlider!=sliders[p])
         continue;

      float val;
      float lower = float(0.0);
      float upper = float(10.0);
      float range;

      LADSPA_PortRangeHint hint = mData->PortRangeHints[ports[p]];
      if (LADSPA_IS_HINT_BOUNDED_BELOW(hint.HintDescriptor))
         lower = hint.LowerBound;
      if (LADSPA_IS_HINT_BOUNDED_ABOVE(hint.HintDescriptor))
         upper = hint.UpperBound;
      if (LADSPA_IS_HINT_SAMPLE_RATE(hint.HintDescriptor)) {
         lower *= sampleRate;
         upper *= sampleRate;
      }

      range = upper - lower;

      val = (sliders[p]->GetValue() / 1000.0) * range + lower;

      wxString str;
      if (LADSPA_IS_HINT_INTEGER(hint.HintDescriptor))
         str.Printf(wxT("%d"), (int)(val + 0.5));
      else
         str.Printf(wxT("%f"), val);

      fields[p]->SetValue(str);

      inputControls[ports[p]] = val;
   }

   inSlider = false;
}

void LadspaEffectDialog::HandleText()
{
   // if we don't add the following three lines, changing
   // the value of the slider will change the text, which
   // will change the slider, and so on.  This gets rid of
   // the implicit loop.

   if (inSlider)
      return;
   inText = true;
   for (unsigned long p = 0; p < numParams; p++) {
      double dval;
      float val;
      float lower = float(0.0);
      float upper = float(10.0);
      float range;

      fields[p]->GetValue().ToDouble(&dval);
      val = dval;

      LADSPA_PortRangeHint hint = mData->PortRangeHints[ports[p]];
      if (LADSPA_IS_HINT_BOUNDED_BELOW(hint.HintDescriptor))
         lower = hint.LowerBound;
      if (LADSPA_IS_HINT_BOUNDED_ABOVE(hint.HintDescriptor))
         upper = hint.UpperBound;      
      if (LADSPA_IS_HINT_SAMPLE_RATE(hint.HintDescriptor)) {
         lower *= sampleRate;
         upper *= sampleRate;
      }         
      range = upper - lower;

      if (val < lower)
         val = lower;
      if (val > upper)
         val = upper;

      inputControls[ports[p]] = val;

      sliders[p]->SetValue((int)(((val-lower)/range) * 1000.0 + 0.5));      
   }

   inText = false;
}

void LadspaEffectDialog::OnOK(wxCommandEvent & WXUNUSED(event))
{
   EndModal(TRUE);
}

void LadspaEffectDialog::OnCancel(wxCommandEvent & WXUNUSED(event))
{
   EndModal(FALSE);
}

void LadspaEffectDialog::OnPreview(wxCommandEvent & WXUNUSED(event))
{
   effect->Preview();
}

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