[SPTK-CVS] SPTK4/src fftr.cc,NONE,1.1

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Update of /cvsroot/sp-tk/SPTK4/src
In directory sfp-cvs-1.v30.ch3.sourceforge.com:/tmp/cvs-serv5277

Added Files:
	fftr.cc 
Log Message:
add fftr command

--- NEW FILE: fftr.cc ---
// ----------------------------------------------------------------- //
//             The Speech Signal Processing Toolkit (SPTK)           //
//             developed by SPTK Working Group                       //
//             http://sp-tk.sourceforge.net/                         //
// ----------------------------------------------------------------- //
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//  Copyright (c) 1984-2007  Tokyo Institute of Technology           //
//                           Interdisciplinary Graduate School of    //
//                           Science and Engineering                 //
//                                                                   //
//                1996-2016  Nagoya Institute of Technology          //
//                           Department of Computer Science          //
//                                                                   //
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#include <unistd.h>
#include <cmath>
#include <fstream>
#include <iostream>
#include <sstream>
#include <vector>

#include "fast_fourier_transform_for_real_sequence.h"
#include "sptk_utils.h"

namespace {

enum OutputFormats {
  kOutputRealAndImaginaryParts = 0,
  kOutputRealPart,
  kOutputImaginaryPart,
  kOutputAmplitude,
  kOutputPower,
  kNumOutputFormats
};

const int kDefaultFftSize(256);
const bool kDefaultHalfSizeOutputFlag(false);

void PrintUsage(std::ostream* stream) {
  // clang-format off
  *stream << std::endl;
  *stream << " fftr - FFT for real sequence" << std::endl;
  *stream << std::endl;
  *stream << "  usage:" << std::endl;
  *stream << "       fftr [ options ] [ infile ] > stdout" << std::endl;
  *stream << "  options:" << std::endl;
  *stream << "       -l l  : FFT size                       [" << kDefaultFftSize << "]" << std::endl;  // NOLINT
  *stream << "       -m m  : order of sequence              [l-1]" << std::endl;
  *stream << "       -o o  : output format                  [0]" << std::endl;
  *stream << "                 0 (real and imaginary parts)" << std::endl;
  *stream << "                 1 (real part)" << std::endl;
  *stream << "                 2 (imaginary part)" << std::endl;
  *stream << "                 3 (amplitude)" << std::endl;
  *stream << "                 4 (power)" << std::endl;
  *stream << "       -H    : output half size               [" << sptk::ConvertBooleanToString(kDefaultHalfSizeOutputFlag) << "]" << std::endl;  // NOLINT
  *stream << "       -h    : print this message" << std::endl;
  *stream << "  infile:" << std::endl;
  *stream << "       data sequence (double)                 [stdin]" << std::endl;  // NOLINT
  *stream << "  stdout:" << std::endl;
  *stream << "       FFT sequence (double)" << std::endl;
  *stream << std::endl;
  *stream << " SPTK: version " << sptk::kVersion << std::endl;
  *stream << std::endl;
  // clang-format on
}

}  // namespace

int main(int argc, char* argv[]) {
  int fft_size(kDefaultFftSize);
  int num_order(kDefaultFftSize - 1);
  bool is_num_order_specified(false);
  bool half_size_output_flag(kDefaultHalfSizeOutputFlag);
  OutputFormats output_format(kOutputRealAndImaginaryParts);

  for (;;) {
    const char option_char(getopt(argc, argv, "l:m:o:Hh"));
    if (-1 == option_char) break;

    switch (option_char) {
      case 'l': {
        if (!sptk::ConvertStringToInteger(optarg, &fft_size)) {
          std::ostringstream error_message;
          error_message << "The argument for the -l option must be an integer";
          sptk::PrintErrorMessage("fftr", error_message);
          return 1;
        }
        break;
      }
      case 'm': {
        if (!sptk::ConvertStringToInteger(optarg, &num_order) ||
            num_order < 0) {
          std::ostringstream error_message;
          error_message << "The argument for the -m option must be a "
                        << "non-negative integer";
          sptk::PrintErrorMessage("fft", error_message);
          return 1;
        }
        is_num_order_specified = true;
        break;
      }
      case 'o': {
        int given_integer(-1);
        if (!sptk::ConvertStringToInteger(optarg, &given_integer)) {
          std::ostringstream error_message;
          error_message << "The argument for the -o option must be an integer";
          sptk::PrintErrorMessage("fftr", error_message);
          return 1;
        }

        const int min(0);
        const int max(static_cast<int>(kNumOutputFormats) - 1);
        if (!sptk::IsInRange(given_integer, min, max)) {
          std::ostringstream error_message;
          error_message << "The argument for the -o option must be in range"
                        << " (" << min << " .. " << max << ")";
          sptk::PrintErrorMessage("fftr", error_message);
          return 1;
        }

        output_format = static_cast<OutputFormats>(given_integer);
        break;
      }
      case 'H': {
        half_size_output_flag = true;
        break;
      }
      case 'h': {
        PrintUsage(&std::cout);
        return 0;
      }
      default: {
        PrintUsage(&std::cerr);
        return 1;
      }
    }
  }

  // check order
  if (is_num_order_specified) {
    if (fft_size <= num_order) {
      std::ostringstream error_message;
      error_message << "The order of a sequence " << num_order
                    << " should be less than the FFT size " << fft_size;
      sptk::PrintErrorMessage("fftr", error_message);
      return 1;
    }
  } else {
    num_order = fft_size - 1;
  }

  // get input file
  const char* input_file((optind < argc) ? argv[argc - 1] : NULL);

  // open stream
  std::ifstream ifs;
  ifs.open(input_file, std::ios::in | std::ios::binary);
  if (ifs.fail() && NULL != input_file) {
    std::ostringstream error_message;
    error_message << "Cannot open file " << input_file;
    sptk::PrintErrorMessage("fftr", error_message);
    return 1;
  }
  std::istream& input_stream(ifs.fail() ? std::cin : ifs);

  // prepare for fast Fourier transform
  sptk::FastFourierTransformForRealSequence fft(num_order, fft_size, false);
  sptk::FastFourierTransformForRealSequence::Buffer buffer;
  if (!fft.IsValid()) {
    std::ostringstream error_message;
    error_message << "FFT size must be a power of 2 and greater than 4";
    sptk::PrintErrorMessage("fftr", error_message);
    return 1;
  }

  const int input_length(num_order + 1);
  const int output_length(half_size_output_flag ? (fft_size / 2 + 1)
                                                : fft_size);
  std::vector<double> input_x(input_length);
  std::vector<double> output_x(fft_size);
  std::vector<double> output_y(fft_size);

  while (sptk::ReadStream(true, input_length, &input_x, &input_stream)) {
    if (!fft.Run(input_x, &output_x, &output_y, &buffer)) {
      std::ostringstream error_message;
      error_message << "Failed to run fast Fourier transform";
      sptk::PrintErrorMessage("fftr", error_message);
      return 1;
    }

    if (kOutputAmplitude == output_format) {
      for (int i(0); i < output_length; ++i) {
        output_x[i] =
            std::sqrt(output_x[i] * output_x[i] + output_y[i] * output_y[i]);
      }
    } else if (kOutputPower == output_format) {
      for (int i(0); i < output_length; ++i) {
        output_x[i] = output_x[i] * output_x[i] + output_y[i] * output_y[i];
      }
    }

    if (kOutputImaginaryPart != output_format &&
        !sptk::WriteStream(output_length, output_x, &std::cout)) {
      std::ostringstream error_message;
      error_message << "Failed to write an output sequence";
      sptk::PrintErrorMessage("fftr", error_message);
      return 1;
    }

    if ((kOutputRealAndImaginaryParts == output_format ||
         kOutputImaginaryPart == output_format) &&
        !sptk::WriteStream(output_length, output_y, &std::cout)) {
      std::ostringstream error_message;
      error_message << "Failed to write an output sequence";
      sptk::PrintErrorMessage("fftr", error_message);
      return 1;
    }
  }

  return 0;
}