FloatVectorClip.cpp

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  FloatVectorClip.cpp
 
  Matthieu Hodgkinson
 
**********************************************************************/
 
#include "FloatVectorClip.h"
#include <cmath>
 
FloatVectorClip::FloatVectorClip(
   int sampleRate, const std::vector<std::vector<float>>& audio)
    : mSampleRate { sampleRate }
    , mAudio { audio }
{
}
 
namespace
{
std::vector<std::vector<float>>
Duplicate(const std::vector<float>& audio, size_t numChannels)
{
   std::vector<std::vector<float>> duplicate;
   for (auto i = 0u; i < numChannels; ++i)
      duplicate.push_back(audio);
   return duplicate;
}
} // namespace
 
FloatVectorClip::FloatVectorClip(
   int sampleRate, const std::vector<float>& audio, size_t numChannels)
    : FloatVectorClip(sampleRate, Duplicate(audio, numChannels))
{
}
 
AudioSegmentSampleView FloatVectorClip::GetSampleView(
   size_t iChannel, sampleCount start, size_t len, bool mayThrow) const
{
   std::vector<BlockSampleView> blockViews {
      std::make_shared<std::vector<float>>(mAudio[iChannel])
   };
   // todo(mhodgkinson) review argument types.
   return AudioSegmentSampleView(
      std::move(blockViews), start.as_size_t(), len);
}
 
sampleCount FloatVectorClip::GetVisibleSampleCount() const
{
   return mAudio[0].size();
}
 
size_t FloatVectorClip::NChannels() const
{
   return mAudio.size();
}
 
int FloatVectorClip::GetRate() const
{
   return mSampleRate;
}
 
sampleCount FloatVectorClip::TimeToSamples(double time) const
{
   return sampleCount(floor(time * GetRate() + 0.5));
}
 
double FloatVectorClip::GetPlayDuration() const
{
   return stretchRatio * mAudio[0].size() / mSampleRate;
}