/**********************************************************************  Audacity: A Digital Audio Editor  Amplify.cpp  Dominic Mazzoni  Vaughan Johnson (Preview)  This rewritten class supports a smart Amplify effect - it calculates  the maximum amount of gain that can be applied to all tracks without  causing clipping and selects this as the default parameter.**********************************************************************/#include "Amplify.h"#include "../WaveTrack.h"#include <math.h>#include <wx/button.h>#include <wx/checkbox.h>#include <wx/sizer.h>#include <wx/stattext.h>#include <wx/textctrl.h>#include <wx/valtext.h>#define ID_BUTTON_PREVIEW 10005//// EffectAmplify//EffectAmplify::EffectAmplify(){   ratio = float(1.0);}wxString EffectAmplify::GetEffectDescription() {    // Note: This is useful only after ratio has been set.    return wxString::Format(_("Applied effect: %s %.1f dB"),                            this->GetEffectName().c_str(), 20*log10(ratio)); } bool EffectAmplify::Init(){   peak = float(0.0);   TrackListIterator iter(mWaveTracks);   Track *t = iter.First();   int count = 0;   while(t) {      float min, max;      ((WaveTrack *)t)->GetMinMax(&min, &max, mT0, mT1);      float newpeak = (fabs(min) > fabs(max) ? fabs(min) : fabs(max));            if (newpeak > peak)         peak = newpeak;         t = iter.Next();      count++;   }      return true;}bool EffectAmplify::TransferParameters( Shuttle & shuttle ){   shuttle.TransferFloat( wxT("Ratio"), ratio, 0.9f );   return true;}bool EffectAmplify::PromptUser(){   AmplifyDialog dlog(this, mParent, -1, _("Amplify"));   dlog.peak = peak;   if (peak > 0.0)      dlog.ratio = 1.0 / peak;   else      dlog.ratio = 1.0;   dlog.TransferDataToWindow();   dlog.CenterOnParent();   dlog.ShowModal();   if (!dlog.GetReturnCode())      return false;   ratio = dlog.ratio;   if (dlog.noclip && ratio*peak > 1.0)      ratio = 1.0 / peak;   return true;}bool EffectAmplify::ProcessSimpleMono(float *buffer, sampleCount len){   sampleCount i;   for (i = 0; i < len; i++)      buffer[i] = (buffer[i] * ratio);   return true;}//----------------------------------------------------------------------------// AmplifyDialog//----------------------------------------------------------------------------#define AMP_MIN -240#define AMP_MAX 240// WDR: event table for AmplifyDialogBEGIN_EVENT_TABLE(AmplifyDialog, wxDialog)    EVT_BUTTON(wxID_OK, AmplifyDialog::OnOk)    EVT_BUTTON(wxID_CANCEL, AmplifyDialog::OnCancel)    EVT_SLIDER(ID_AMP_SLIDER, AmplifyDialog::OnAmpSlider)    EVT_TEXT(ID_AMP_TEXT, AmplifyDialog::OnAmpText)    EVT_TEXT(ID_PEAK_TEXT, AmplifyDialog::OnPeakText)    EVT_CHECKBOX(ID_CLIP_CHECKBOX, AmplifyDialog::OnClipCheckBox)    EVT_BUTTON(ID_BUTTON_PREVIEW, AmplifyDialog::OnPreview)END_EVENT_TABLE()AmplifyDialog::AmplifyDialog(EffectAmplify * effect,                              wxWindow * parent, wxWindowID id,                              const wxString & title,                              const wxPoint & position, const wxSize & size,                              long style):   wxDialog(parent, id, title, position, size, style){   mLoopDetect = false;	m_pEffect = effect;   ratio = float(1.0);   peak = float(0.0);	wxStaticText * pStaticText;   wxBoxSizer * pBoxSizer_Dialog = new wxBoxSizer(wxVERTICAL);   pStaticText = new wxStaticText(this, -1,                                  _("Amplify by Dominic Mazzoni"),                                  wxDefaultPosition, wxDefaultSize, 0);   pBoxSizer_Dialog->Add(pStaticText, 0, wxALIGN_CENTER | wxALL, 10);   // Amplification text control   wxBoxSizer *item2 = new wxBoxSizer(wxHORIZONTAL);   pStaticText = new wxStaticText(this, -1, _("Amplification (dB):"),                                  wxDefaultPosition, wxDefaultSize, 0);   item2->Add(pStaticText, 0, wxALIGN_CENTER_VERTICAL | wxALL, 5);   wxTextCtrl * item4 = new wxTextCtrl(this, ID_AMP_TEXT, wxT(""),                                        wxDefaultPosition, wxSize(60, -1),                                        0, wxTextValidator(wxFILTER_NUMERIC));   item2->Add(item4, 0, wxALIGN_CENTER_VERTICAL | wxALL, 5);   pBoxSizer_Dialog->Add(item2, 0, wxALIGN_CENTER | wxALL, 5);      // slider   wxSlider *item5 =       new wxSlider(this, ID_AMP_SLIDER, 0, AMP_MIN, AMP_MAX,                    wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);   pBoxSizer_Dialog->Add(item5, 1, wxGROW | wxALIGN_CENTER | wxALL, 5);   // New Peak Amplitude text control   wxBoxSizer *item6 = new wxBoxSizer(wxHORIZONTAL);      pStaticText = new wxStaticText(this, -1, _("New Peak Amplitude (dB):"),                                  wxDefaultPosition, wxDefaultSize, 0);   item6->Add(pStaticText, 0, wxALIGN_CENTER_VERTICAL | wxALL, 5);      wxTextCtrl *item8 = new wxTextCtrl(this, ID_PEAK_TEXT, wxT(""),                                       wxDefaultPosition, wxSize(60, -1), 0);   item6->Add(item8, 0, wxALIGN_CENTER_VERTICAL | wxALL, 5);      pBoxSizer_Dialog->Add(item6, 0, wxALIGN_CENTER | wxALL, 5);      // "Allow clipping" checkbox   wxCheckBox *item8b = new wxCheckBox(this, ID_CLIP_CHECKBOX,                                       _("Allow clipping"),                                       wxDefaultPosition, wxDefaultSize, 0);      pBoxSizer_Dialog->Add(item8b, 0, wxALIGN_CENTER | wxALL, 5);   // Preview, OK, & Cancel buttons   pBoxSizer_Dialog->Add(0, 10, 0); // spacer   wxBoxSizer * pBoxSizer_OK = new wxBoxSizer(wxHORIZONTAL);   wxButton * pButton_Preview =       new wxButton(this, ID_BUTTON_PREVIEW, m_pEffect->GetPreviewName());   pBoxSizer_OK->Add(pButton_Preview, 0, wxALIGN_CENTER | wxALL, 5);   pBoxSizer_OK->Add(25, 8); // horizontal spacer      wxButton *item11 =      new wxButton(this, wxID_CANCEL, _("Cancel"), wxDefaultPosition,                   wxDefaultSize, 0);   pBoxSizer_OK->Add(item11, 0, wxALIGN_CENTER | wxALL, 5);      wxButton *item10 =      new wxButton(this, wxID_OK, _("OK"), wxDefaultPosition, wxDefaultSize, 0);   item10->SetDefault();   item10->SetFocus();   pBoxSizer_OK->Add(item10, 0, wxALIGN_CENTER | wxALL, 5);      pBoxSizer_Dialog->Add(pBoxSizer_OK, 0, wxALIGN_CENTER | wxALL, 5);      SetAutoLayout(TRUE);   SetSizer(pBoxSizer_Dialog);   pBoxSizer_Dialog->Fit(this);   pBoxSizer_Dialog->SetSizeHints(this);}bool AmplifyDialog::Validate(){   return TRUE;}bool AmplifyDialog::TransferDataToWindow(){   wxSlider *slider;   slider = GetAmpSlider();   if (slider)      slider->SetValue((int)(200*log10(ratio)+0.5));   mLoopDetect = true;   wxTextCtrl *text = GetAmpText();   if (text) {      wxString str;      str.Printf(wxT("%.1f"), 20*log10(ratio));      text->SetValue(str);   }   text = GetPeakText();   if (text) {      wxString str;      str.Printf(wxT("%.1f"), 20*log10(ratio*peak));      text->SetValue(str);   }   mLoopDetect = false;   return TRUE;}bool AmplifyDialog::TransferDataFromWindow(){   wxTextCtrl *c = GetAmpText();   if (c) {      double r = 0;      wxString val = c->GetValue();      val.ToDouble(&r);      ratio = pow(10.0,TrapDouble(r*10, AMP_MIN, AMP_MAX)/200.0);   }   noclip = GetClipCheckBox()->GetValue();   return TRUE;}// WDR: handler implementations for AmplifyDialogvoid AmplifyDialog::OnAmpText(wxCommandEvent & event){   if (mLoopDetect)      return;   wxTextCtrl *c = GetAmpText();   if (c) {      double r;      mLoopDetect = true;      wxString val = c->GetValue();      val.ToDouble(&r);      ratio = pow(10.0,TrapDouble(r*10, AMP_MIN, AMP_MAX)/200.0);      wxSlider *slider = GetAmpSlider();      if (slider)         slider->SetValue((int)(200*log10(ratio)+0.5));      wxString str;      str.Printf(wxT("%.1f"), 20*log10(ratio*peak));      GetPeakText()->SetValue(str);      mLoopDetect = false;   }      CheckClip();}void AmplifyDialog::OnPeakText(wxCommandEvent & event){   if (mLoopDetect)      return;   wxTextCtrl *c = GetPeakText();   if (c) {      double r;      mLoopDetect = true;      wxString val = c->GetValue();      val.ToDouble(&r);      ratio = pow(10.0, r/20.0) / peak;            double dB = TrapDouble(200*log10(ratio), AMP_MIN, AMP_MAX)/10.0;      ratio = pow(10.0, dB/20.0);      wxSlider *slider = GetAmpSlider();      if (slider)         slider->SetValue((int)(10*dB+0.5));            wxString str;      str.Printf(wxT("%.1f"), dB);      GetAmpText()->SetValue(str);            mLoopDetect = false;   }      CheckClip();}void AmplifyDialog::OnAmpSlider(wxCommandEvent & event){   if (mLoopDetect)      return;   mLoopDetect = true;   wxString str;   double dB = GetAmpSlider()->GetValue() / 10.0;   ratio = pow(10.0,TrapDouble(dB, AMP_MIN, AMP_MAX)/20.0);      double dB2 = (GetAmpSlider()->GetValue()-1) / 10.0;   double ratio2 = pow(10.0,TrapDouble(dB2, AMP_MIN, AMP_MAX)/20.0);   if (GetClipCheckBox()->GetValue() &&       ratio * peak > 1.0 &&       ratio2 * peak < 1.0)      ratio = 1.0 / peak;      str.Printf(wxT("%.1f"), 20*log10(ratio));   GetAmpText()->SetValue(str);   str.Printf(wxT("%.1f"), 20*log10(ratio*peak));   GetPeakText()->SetValue(str);   mLoopDetect = false;   CheckClip();}void AmplifyDialog::OnClipCheckBox(wxCommandEvent & event){   CheckClip();}void AmplifyDialog::CheckClip(){   if (!GetClipCheckBox()->GetValue()) {      GetOK()->Enable(ratio * peak <= 1.0);   }   else {      GetOK()->Enable(true);   }}void AmplifyDialog::OnPreview(wxCommandEvent &event){   TransferDataFromWindow();	// Save & restore parameters around Preview, because we didn't do OK.	float oldRatio = m_pEffect->ratio;	float oldPeak = m_pEffect->peak;   m_pEffect->ratio = ratio;   if (noclip && ratio*peak > 1.0)      m_pEffect->ratio = 1.0 / peak;   m_pEffect->peak = peak;   m_pEffect->Preview();   m_pEffect->ratio = oldRatio;   m_pEffect->peak = oldPeak;}void AmplifyDialog::OnOk(wxCommandEvent & event){   TransferDataFromWindow();      if (GetClipCheckBox()->GetValue() == true) {     if (ratio * peak > 1.0)        ratio = 1.0 / peak;   }   if (Validate())      EndModal(true);   else {      event.Skip();   }}void AmplifyDialog::OnCancel(wxCommandEvent & event){   EndModal(false);}// Indentation settings for Vim and Emacs and unique identifier for Arch, a// version control system. Please do not modify past this point.//// Local Variables:// c-basic-offset: 3// indent-tabs-mode: nil// End://// vim: et sts=3 sw=3// arch-tag: a8583903-8582-4293-b7d0-3196ab53e0c8