MIR::WavMirAudioReader Class Reference

#include <WavMirAudioReader.h>

Inheritance diagram for MIR::WavMirAudioReader:

Collaboration diagram for MIR::WavMirAudioReader:

Public Member Functions
	WavMirAudioReader (const std::string &filename, std::optional< double > timeLimit={})
double	GetSampleRate () const override
long long	GetNumSamples () const override
void	ReadFloats (float *buffer, long long start, size_t numFrames) const override
Public Member Functions inherited from MIR::MirAudioReader
virtual double	GetSampleRate () const =0
virtual long long	GetNumSamples () const =0
virtual void	ReadFloats (float *buffer, long long where, size_t numFrames) const =0
double	GetDuration () const
virtual	~MirAudioReader ()=default

Private Attributes
const std::vector< float >	mSamples
const double	mSampleRate = 0.

Detailed Description

Definition at line 21 of file WavMirAudioReader.h.

Constructor & Destructor Documentation

WavMirAudioReader()

MIR::WavMirAudioReader::WavMirAudioReader	(	const std::string &	filename,
		std::optional< double >	timeLimit = {}
	)

Definition at line 21 of file WavMirAudioReader.cpp.

{
   AudioFileInfo info;
   std::vector<std::vector<float>> samples;
   if (!AudioFileIO::Read(filename, samples, info))
      throw std::runtime_error(std::string { "Failed to read " } + filename);
 
   const_cast<double&>(mSampleRate) = info.sampleRate;
   const auto limit = timeLimit.has_value() ?
                         static_cast<long long>(*timeLimit * info.sampleRate) :
                         std::numeric_limits<long long>::max();
   auto& mutableSamples = const_cast<std::vector<float>&>(mSamples);
   const auto numFrames = std::min<long long>(info.numFrames, limit);
   mutableSamples.resize(numFrames);
   if (info.numChannels == 2)
      for (size_t i = 0; i < numFrames; ++i)
         mutableSamples[i] = (samples[0][i] + samples[1][i]) / 2.f;
   else
      std::copy(
         samples[0].begin(), samples[0].begin() + numFrames,
         mutableSamples.begin());
}

References details::begin(), staffpad::vo::copy(), mSampleRate, and mSamples.

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Member Function Documentation

GetNumSamples()

long long MIR::WavMirAudioReader::GetNumSamples ( ) const

overridevirtual

Implements MIR::MirAudioReader.

Definition at line 50 of file WavMirAudioReader.cpp.

{
   return mSamples.size();
}

References mSamples.

GetSampleRate()

double MIR::WavMirAudioReader::GetSampleRate ( ) const

overridevirtual

Implements MIR::MirAudioReader.

Definition at line 45 of file WavMirAudioReader.cpp.

{
   return mSampleRate;
}

References mSampleRate.

ReadFloats()

void MIR::WavMirAudioReader::ReadFloats ( float *  buffer, long long  start, size_t  numFrames  ) const

overridevirtual

Implements MIR::MirAudioReader.

Definition at line 55 of file WavMirAudioReader.cpp.

{
   assert(start >= 0);
   assert(start + numFrames <= mSamples.size());
   std::copy(
      mSamples.begin() + start, mSamples.begin() + start + numFrames, buffer);
}

References staffpad::vo::copy(), and mSamples.

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Member Data Documentation

mSampleRate

const double MIR::WavMirAudioReader::mSampleRate = 0.

private

Definition at line 34 of file WavMirAudioReader.h.

Referenced by GetSampleRate(), and WavMirAudioReader().

mSamples

const std::vector<float> MIR::WavMirAudioReader::mSamples

private

Definition at line 33 of file WavMirAudioReader.h.

Referenced by GetNumSamples(), ReadFloats(), and WavMirAudioReader().

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The documentation for this class was generated from the following files:

• WavMirAudioReader.h
• WavMirAudioReader.cpp