repeat.cpp

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

/**********************************************************************

  Audacity: A Digital Audio Editor

  Repeat.cpp

  Dominic Mazzoni
  Vaughan Johnson

**********************************************************************/

#include "Repeat.h"
#include "../Audacity.h"
#include "../WaveTrack.h"

#include <wx/button.h>
#include <wx/defs.h>
#include <wx/intl.h>
#include <wx/msgdlg.h>
#include <wx/sizer.h>
#include <wx/stattext.h>
#include <wx/textctrl.h>
#include <wx/validate.h>
#include <wx/valtext.h>

#include <math.h>


EffectRepeat::EffectRepeat()
{
   repeatCount = 10;
}

wxString EffectRepeat::GetEffectDescription() { 
   // Note: This is useful only after values have been set. 
   return wxString::Format(_("Repeated %d times"), repeatCount);
} 

bool EffectRepeat::PromptUser()
{
   //
   // Figure out the maximum number of times the selection
   // could be repeated without overflowing any track
   //
   int maxCount = -1;
   TrackListIterator iter(mWaveTracks);
   WaveTrack *track = (WaveTrack *) iter.First();
   while (track) {
      sampleCount trackLen = 
         (sampleCount)((track->GetEndTime() - track->GetStartTime()) * 
                       track->GetRate());
      sampleCount selectionLen = (sampleCount)((mT1 - mT0) * track->GetRate());
      int availSamples = 2147483647 - trackLen;
      int count = availSamples / selectionLen;
      if (maxCount == -1 || count < maxCount)
         maxCount = count;

      track = (WaveTrack *) iter.Next();
   }
   
   if (maxCount <= 1) {
      wxMessageBox(_("Tracks are too long to repeat the selection."),
                   _("Repeat"), wxOK | wxCENTRE, mParent);
      return false;
   }

   RepeatDialog dlog(mParent, -1, _("Repeat"));
   dlog.repeatCount = repeatCount;
   dlog.selectionTimeSecs = mT1 - mT0;
   dlog.maxCount = maxCount;
   dlog.TransferDataToWindow();

   dlog.CentreOnParent();

   dlog.ShowModal();

   if (!dlog.GetReturnCode())
      return false;

   repeatCount = dlog.repeatCount;
   if (repeatCount > maxCount)
      repeatCount = maxCount;
   if (repeatCount < 1)
      repeatCount = 1;

   return true;
}

bool EffectRepeat::TransferParameters( Shuttle & shuttle )
{  
   shuttle.TransferInt(wxT("Count"),repeatCount,1);
   return true;
}

bool EffectRepeat::Process()
{
   TrackListIterator iter(mWaveTracks);
   WaveTrack *track = (WaveTrack *) iter.First();
   int count = 0;
	double maxDestLen = 0.0; // used to change selection to original plus generated
	double newDestLen = 0.0;
   while (track) {
      double trackStart = track->GetStartTime();
      double trackEnd = track->GetEndTime();
      double t0 = mT0 < trackStart? trackStart: mT0;
      double t1 = mT1 > trackEnd? trackEnd: mT1;

      if (t1 <= t0)
         continue;

      longSampleCount start = track->TimeToLongSamples(t0);
      longSampleCount end = track->TimeToLongSamples(t1);
      sampleCount len = (sampleCount)(end - start);

      if (len <= 0)
         continue;

      //
      // Create a track that contains 1 or more copies of the
      // selection, cleverly arranged so that every BlockFile
      // is within the minimum and maxmimum lengths of a normal
      // BlockFile.  That allows us to repeat the same sequence
      // of identical BlockFiles, saving lots of disk space.
      //

      sampleFormat format = track->GetSampleFormat();
      WaveTrack *unitTrack = mFactory->NewWaveTrack(format);
      WaveTrack *dest = mFactory->NewWaveTrack(format);
      sampleCount maxBlockSize = unitTrack->GetMaxBlockSize();
      sampleCount minBlockSize = maxBlockSize / 2;
      samplePtr buffer = NewSamples(maxBlockSize, format);

      int numCopies = 1;
      int chunkSize = len;
      int j;

      while (chunkSize * numCopies < minBlockSize)
         numCopies++;
      
      if (chunkSize > maxBlockSize) {
         j=2;

         while(chunkSize/j >= maxBlockSize)
            j++;

         chunkSize = (chunkSize + (j-1)) / j;
      }

      sampleCount totalSamples = 0;
      while(totalSamples < len * numCopies) {
         sampleCount blockLen = chunkSize;
         sampleCount blockStart = (totalSamples % len);

         if (totalSamples + blockLen > len * numCopies)
            blockLen = len * numCopies - totalSamples;

         if (!track->Get(buffer, format, start+blockStart, blockLen)) {
            delete unitTrack;
            return false;
         }

         unitTrack->Append(buffer, format, blockLen);
         if (numCopies == 1)
            unitTrack->Flush();

         totalSamples += blockLen;
      }
      if (numCopies != 1)
         unitTrack->Flush();

      //
      // Repeat the unit track enough times, possible creating a few
      // more than desired
      //

      int desiredCopies = repeatCount+1;
      int desiredUnitTracks = (desiredCopies + (numCopies-1)) / numCopies;
      for(j=0; j<desiredUnitTracks; j++)
         dest->Paste(dest->GetEndTime(), unitTrack);

      //
      // If necessary, delete a few copies from the end
      //

      int actualCopies = desiredUnitTracks * numCopies;
      if (actualCopies > desiredCopies) {
         double oneLen = unitTrack->GetEndTime() / numCopies;
         double clearLen = oneLen * (actualCopies - desiredCopies);
			double oldDestLen = dest->GetEndTime();
			newDestLen = oldDestLen - clearLen;
         dest->Clear(newDestLen, oldDestLen);
      } else {
			newDestLen = dest->GetEndTime();
		}

		if (newDestLen > maxDestLen)
			maxDestLen = newDestLen;

      track->Clear(t0, t1);
      track->Paste(t0, dest);

      delete unitTrack;
      delete dest;

      track = (WaveTrack *) iter.Next();
      count++;
   }

	mT1 = mT0 + maxDestLen; // Change selection to original plus generated.
   return true;
}

//----------------------------------------------------------------------------
// RepeatDialog
//----------------------------------------------------------------------------

#define ID_REPEAT_TEXT 7000

BEGIN_EVENT_TABLE(RepeatDialog, wxDialog)
   EVT_BUTTON(wxID_OK, RepeatDialog::OnOk)
   EVT_BUTTON(wxID_CANCEL, RepeatDialog::OnCancel)
   EVT_TEXT(ID_REPEAT_TEXT, RepeatDialog::OnRepeatTextChange)
END_EVENT_TABLE()

RepeatDialog::RepeatDialog(wxWindow *parent, wxWindowID id,
                           const wxString &title):
   wxDialog(parent, id, title)
{
   wxBoxSizer *mainSizer = new wxBoxSizer(wxVERTICAL);

   wxStaticText *statText =
      new wxStaticText(this, -1,
                       _("Repeat by Dominic Mazzoni && Vaughan Johnson"));
   mainSizer->Add(statText, 0, wxALIGN_CENTRE | wxALL, 5);

   wxBoxSizer *hSizer = new wxBoxSizer(wxHORIZONTAL);

   statText =
      new wxStaticText(this, -1,
                       _("Number of times to repeat: "));
   hSizer->Add(statText, 0, wxALIGN_CENTRE | wxALL, 5);
   
   mRepeatCount =
      new wxTextCtrl(this, ID_REPEAT_TEXT, wxT("10"), wxDefaultPosition,
                     wxSize(60, -1), 0,
                     wxTextValidator(wxFILTER_NUMERIC));
   hSizer->Add(mRepeatCount, 0, wxALL, 5);
   mainSizer->Add(hSizer, 0, wxALIGN_CENTRE | wxALL, 5);

   hSizer = new wxBoxSizer(wxHORIZONTAL);
   mTotalTime =
      new wxStaticText(this, -1, wxString(_("New selection length: ")) +
                       wxT("XX minutes, XX seconds"));
   hSizer->Add(mTotalTime, 1, wxALL | wxEXPAND, 5);
   mainSizer->Add(hSizer, 0, wxALIGN_CENTRE | wxALL, 5);

   hSizer = new wxBoxSizer(wxHORIZONTAL);

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

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

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

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

void RepeatDialog::OnRepeatTextChange(wxCommandEvent & event)
{
   // We may even get called during the constructor.
   // This test saves us from calling unsafe functions.
   if( !IsShown() )
      return;
   TransferDataFromWindow();

   DisplayNewTime();
}

void RepeatDialog::DisplayNewTime()
{
   int newTime = (int)(selectionTimeSecs * (repeatCount + 1));
   wxString str;

   str = _("New selection length: ");
   if (newTime >= 120)
      str += wxString::Format(_("%d minutes, %d seconds"),
                              newTime/60, newTime%60);
   else
      str += wxString::Format(_("%d seconds"),
                              newTime);

   mTotalTime->SetLabel(str);
}

bool RepeatDialog::Validate()
{
   return TRUE;
}

bool RepeatDialog::TransferDataToWindow()
{
   mRepeatCount->SetValue(wxString::Format(wxT("%d"), repeatCount));
   DisplayNewTime();

   return true;
}

bool RepeatDialog::TransferDataFromWindow()
{
   long l;
   mRepeatCount->GetValue().ToLong(&l);

   repeatCount = l;
   if (repeatCount < 1)
      repeatCount = 1;
   if (repeatCount > maxCount)
      repeatCount = maxCount;

   return true;
}

void RepeatDialog::OnOk(wxCommandEvent & event)
{
   TransferDataFromWindow();
   
   EndModal(true);
}

void RepeatDialog::OnCancel(wxCommandEvent & event)
{
   EndModal(false);
}




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