C++ WaveTrack::GetIdealBlockSize方法代码示例

bool MixAndRender(TrackList *tracks, TrackFactory *trackFactory,
                  double rate, sampleFormat format,
                  double startTime, double endTime,
                  WaveTrack **newLeft, WaveTrack **newRight)
{
   // This function was formerly known as "Quick Mix".  It takes one or
   // more tracks as input; of all tracks that are selected, it mixes
   // them together, applying any envelopes, amplitude gain, panning,
   // and real-time effects in the process.  The resulting pair of
   // tracks (stereo) are "rendered" and have no effects, gain, panning,
   // or envelopes.

   WaveTrack **waveArray;
   Track *t;
   int numWaves = 0;
   int numMono = 0;
   bool mono = false;
   int w;

   TrackListIterator iter(tracks);

   t = iter.First();
   while (t) {
      if (t->GetSelected() && t->GetKind() == Track::Wave) {
         numWaves++;
         float pan = ((WaveTrack*)t)->GetPan();
         if (t->GetChannel() == Track::MonoChannel && pan == 0)
            numMono++;
      }
      t = iter.Next();
   }

   if (numMono == numWaves)
      mono = true;

   double totalTime = 0.0;

   waveArray = new WaveTrack *[numWaves];
   w = 0;
   t = iter.First();
   while (t) {
      if (t->GetSelected() && t->GetKind() == Track::Wave) {
         waveArray[w++] = (WaveTrack *) t;
         if (t->GetEndTime() > totalTime)
            totalTime = t->GetEndTime();
      }
      t = iter.Next();
   }

   WaveTrack *mixLeft = trackFactory->NewWaveTrack(format, rate);
   mixLeft->SetName(_("Mix"));
   WaveTrack *mixRight = 0;
   if (mono) {
      mixLeft->SetChannel(Track::MonoChannel);
   }
   else {
      mixRight = trackFactory->NewWaveTrack(format, rate);
      mixRight->SetName(_("Mix"));
      mixLeft->SetChannel(Track::LeftChannel);
      mixRight->SetChannel(Track::RightChannel);
      mixLeft->SetLinked(true);
      mixRight->SetTeamed(true);
   }

   int maxBlockLen = mixLeft->GetIdealBlockSize();

   if (startTime == endTime) {
      startTime = 0.0;
      endTime = totalTime;
   }

   Mixer *mixer = new Mixer(numWaves, waveArray, tracks->GetTimeTrack(),
                            startTime, endTime, mono ? 1 : 2, maxBlockLen, false,
                            rate, format);

   wxYield();
   GetActiveProject()->ProgressShow(_NoAcc("&Mix and Render"),
                                    _("Mixing and rendering tracks"));
   wxBusyCursor busy;
   
   bool cancelling = false;
   while(!cancelling) {
      sampleCount blockLen = mixer->Process(maxBlockLen);

      if (blockLen == 0)
         break;

      if (mono) {
         samplePtr buffer = mixer->GetBuffer();
         mixLeft->Append(buffer, format, blockLen);
      }
      else {
         samplePtr buffer;
         buffer = mixer->GetBuffer(0);
         mixLeft->Append(buffer, format, blockLen);
         buffer = mixer->GetBuffer(1);
         mixRight->Append(buffer, format, blockLen);
      }

      int progressvalue = int (1000 * (mixer->MixGetCurrentTime() / totalTime));
//.........这里部分代码省略.........

bool QuickMix(TrackList *tracks, DirManager *dirManager,
              double rate, sampleFormat format)
{
   WaveTrack **waveArray;
   VTrack *t;
   int numWaves = 0;
   int numLeft = 0;
   int numRight = 0;
   int numMono = 0;
   bool mono = false;
   int w;

   TrackListIterator iter(tracks);

   t = iter.First();
   while (t) {
      if (t->GetSelected() && t->GetKind() == VTrack::Wave) {
         numWaves++;
         switch (t->GetChannel()) {
         case VTrack::MonoChannel:
            numLeft++;
            numRight++;
            numMono++;
            break;
         case VTrack::LeftChannel:
            numLeft++;
            break;
         case VTrack::RightChannel:
            numRight++;
            break;
         }
      }
      t = iter.Next();
   }

   if (numMono == numWaves || numLeft == numWaves || numRight == numWaves)
      mono = true;

   double totalTime = 0.0;

   waveArray = new WaveTrack *[numWaves];
   w = 0;
   t = iter.First();
   while (t) {
      if (t->GetSelected() && t->GetKind() == VTrack::Wave) {
         waveArray[w++] = (WaveTrack *) t;
         if (t->GetMaxLen() > totalTime)
            totalTime = t->GetMaxLen();
      }
      t = iter.Next();
   }

   WaveTrack *mixLeft = new WaveTrack(dirManager);
   mixLeft->SetSampleFormat(format);
   mixLeft->SetRate(rate);
   mixLeft->SetChannel(VTrack::MonoChannel);
   mixLeft->SetName(_("Mix"));
   WaveTrack *mixRight = 0;
   if (!mono) {
      mixRight = new WaveTrack(dirManager);
      mixRight->SetSampleFormat(format);
      mixRight->SetRate(rate);
      mixRight->SetName(_("Mix"));
      mixLeft->SetChannel(VTrack::LeftChannel);
      mixRight->SetChannel(VTrack::RightChannel);
      mixLeft->SetLinked(true);
   }

   int maxBlockLen = mixLeft->GetIdealBlockSize();
   double maxBlockTime = maxBlockLen / mixLeft->GetRate();

   Mixer *mixer = new Mixer(mono ? 1 : 2, maxBlockLen, false,
                            rate, format);

   wxProgressDialog *progress = NULL;
   wxYield();
   wxStartTimer();
   wxBusyCursor busy;

   double tt = 0.0;
   while (tt < totalTime) {

      double blockTime = maxBlockTime;
      if (tt + blockTime > totalTime)
         blockTime = totalTime - tt;
      int blockLen = int (blockTime * mixLeft->GetRate());

      mixer->Clear();

      for (int i = 0; i < numWaves; i++) {
         if (mono)
            mixer->MixMono(waveArray[i], tt, tt + blockTime);
         else {
            switch (waveArray[i]->GetChannel()) {
            case VTrack::LeftChannel:
               mixer->MixLeft(waveArray[i], tt, tt + blockTime);
               break;
            case VTrack::RightChannel:
               mixer->MixRight(waveArray[i], tt, tt + blockTime);
               break;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
   /* create the destination track (new track) */
   if ((numWaves == 1) || ((numWaves == 2) && (usefulIter.First()->GetLink() != NULL)))
      oneinput = true;
   // only one input track (either 1 mono or one linked stereo pair)

   WaveTrack *mixLeft = trackFactory->NewWaveTrack(format, rate);
   if (oneinput)
      mixLeft->SetName(usefulIter.First()->GetName()); /* set name of output track to be the same as the sole input track */
   else
      mixLeft->SetName(_("Mix"));
   mixLeft->SetOffset(mixStartTime);
   WaveTrack *mixRight = 0;
   if (mono) {
      mixLeft->SetChannel(Track::MonoChannel);
   }
   else {
      mixRight = trackFactory->NewWaveTrack(format, rate);
      if (oneinput) {
         if (usefulIter.First()->GetLink() != NULL)   // we have linked track
            mixLeft->SetName(usefulIter.First()->GetLink()->GetName()); /* set name to match input track's right channel!*/
         else
            mixLeft->SetName(usefulIter.First()->GetName());   /* set name to that of sole input channel */
      }
      else
         mixRight->SetName(_("Mix"));
      mixLeft->SetChannel(Track::LeftChannel);
      mixRight->SetChannel(Track::RightChannel);
      mixRight->SetOffset(mixStartTime);
      mixLeft->SetLinked(true);
   }



   int maxBlockLen = mixLeft->GetIdealBlockSize();

   // If the caller didn't specify a time range, use the whole range in which
   // any input track had clips in it.
   if (startTime == endTime) {
      startTime = mixStartTime;
      endTime = mixEndTime;
   }

   Mixer *mixer = new Mixer(numWaves, waveArray,
                            Mixer::WarpOptions(tracks->GetTimeTrack()),
                            startTime, endTime, mono ? 1 : 2, maxBlockLen, false,
                            rate, format);

   ::wxSafeYield();
   ProgressDialog *progress = new ProgressDialog(_("Mix and Render"),
                                                 _("Mixing and rendering tracks"));

   int updateResult = eProgressSuccess;
   while(updateResult == eProgressSuccess) {
      sampleCount blockLen = mixer->Process(maxBlockLen);

      if (blockLen == 0)
         break;

      if (mono) {
         samplePtr buffer = mixer->GetBuffer();
         mixLeft->Append(buffer, format, blockLen);
      }
      else {
         samplePtr buffer;
         buffer = mixer->GetBuffer(0);
         mixLeft->Append(buffer, format, blockLen);