TrackSpectrumTransformer.cpp

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/*!********************************************************************
 
Audacity: A Digital Audio Editor
 
TrackSpectrumTransformer.cpp
 
Paul Licameli
 
**********************************************************************/
#include "TrackSpectrumTransformer.h"
 
#include "WaveTrack.h"
 
void TrackSpectrumTransformer::DoOutput(
   const float* outBuffer, size_t mStepSize)
{
   mOutputTrack->Append((constSamplePtr)outBuffer, floatSample, mStepSize);
}
 
bool TrackSpectrumTransformer::Process(
   const WindowProcessor& processor, const WaveChannel& channel,
   size_t queueLength, sampleCount start, sampleCount len)
{
   if (!Start(queueLength))
      return false;
 
   auto bufferSize = channel.GetMaxBlockSize();
   FloatVector buffer(bufferSize);
 
   bool bLoopSuccess = true;
   auto samplePos = start;
   while (bLoopSuccess && samplePos < start + len)
   {
      // Get a blockSize of samples (smaller than the size of the buffer)
      const auto blockSize = limitSampleBufferSize(
         std::min(bufferSize, channel.GetBestBlockSize(samplePos)),
         start + len - samplePos);
 
      // Get the samples from the track and put them in the buffer
      channel.GetFloats(buffer.data(), samplePos, blockSize);
      samplePos += blockSize;
      bLoopSuccess = ProcessSamples(processor, buffer.data(), blockSize);
   }
 
   if (!Finish(processor))
      return false;
 
   return bLoopSuccess;
}
 
bool TrackSpectrumTransformer::DoFinish()
{
   return SpectrumTransformer::DoFinish();
}
 
bool TrackSpectrumTransformer::PostProcess(
   WaveTrack& outputTrack, sampleCount len)
{
   outputTrack.Flush();
   auto tLen = outputTrack.LongSamplesToTime(len);
   // Filtering effects always end up with more data than they started with.
   // Delete this 'tail'.
   outputTrack.Clear(tLen, outputTrack.GetEndTime());
   return true;
}
 
TrackSpectrumTransformer::~TrackSpectrumTransformer() = default;
 
bool TrackSpectrumTransformer::DoStart()
{
   return SpectrumTransformer::DoStart();
}