mimoprocessor_file_io.h

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/******************************************************************************
 Copyright (c) 2012-2016 Institut für Nachrichtentechnik, Universität Rostock
 Copyright (c) 2006-2012 Quality & Usability Lab
                         Deutsche Telekom Laboratories, TU Berlin
 
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 all copies or substantial portions of the Software.
 
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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// https://AudioProcessingFramework.github.io/
 
 
#include <sndfile.hh>  // C++ interface to libsndfile
#include <iostream>
 
#include "stopwatch.h"
#include "apf/container.h"  // for fixed_matrix
 
namespace apf
{
 
template<typename Processor>
int mimoprocessor_file_io(Processor& processor
    , const std::string& infilename
    , const std::string& outfilename)
{
  std::cout << "Opening file \"" << infilename << "\" ..." << std::endl;
 
  auto in = SndfileHandle(infilename, SFM_READ);
 
  if (int err = in.error())
  {
    std::cout << in.strError() << std::endl;
    return err;
  }
 
  if (in.samplerate() != static_cast<int>(processor.sample_rate()))
  {
    std::cout << "Samplerate mismatch!" << std::endl;
    return 42;
  }
 
  if (in.channels() != processor.in_channels())
  {
    std::cout << "Input channel mismatch!" << std::endl;
    return 666;
  }
 
  auto out = SndfileHandle(outfilename, SFM_WRITE
      , in.format(), processor.out_channels(), in.samplerate());
 
  if (int err = out.error())
  {
    std::cout << out.strError() << std::endl;
    return err;
  }
 
  auto format_info = SF_FORMAT_INFO();
  format_info.format = in.format();
  in.command(SFC_GET_FORMAT_INFO, &format_info, sizeof(format_info));
 
  std::cout << "format: " << format_info.name << std::endl;
 
  std::cout << "frames: " << in.frames()
    << " (" << in.frames()/in.samplerate() << " seconds)" << std::endl;
  std::cout << "channels: " << in.channels() << std::endl;
  std::cout << "samplerate: " << in.samplerate() << std::endl;
 
  auto blocksize = processor.block_size();
 
  // these matrices are used for de-interleaving and interleaving
  fixed_matrix<float> m_in(blocksize, size_t(in.channels()));
  fixed_matrix<float> m_in_transpose(size_t(in.channels()), blocksize);
  fixed_matrix<float> m_out(blocksize, size_t(processor.out_channels()));
  fixed_matrix<float> m_out_transpose(
      size_t(processor.out_channels()), blocksize);
 
  processor.activate();
 
  StopWatch watch("processing");
 
  sf_count_t actual_frames = 0;
  while ((actual_frames = in.readf(m_in.data()
          , static_cast<sf_count_t>(blocksize))) != 0)
  {
    m_in_transpose.set_channels(m_in.slices);
 
    processor.audio_callback(blocksize
        , m_in_transpose.get_channel_ptrs()
        , m_out_transpose.get_channel_ptrs());
 
    m_out.set_channels(m_out_transpose.slices);
 
    out.writef(m_out.data(), actual_frames);
  }
 
  //out.writeSync();  // write cache buffers to disk
 
  processor.deactivate();
 
  return 0;
}
 
}  // namespace apf