annotate src/Modules/Output/FileOutputHTK.cc @ 611:0fbaf443ec82

Carfac C++ revision 3, indluding more style improvements. The output structs are now classes again, and have separate storage methods for each output structure along with flags in the Run and RunSegment methods to allow for only storing NAPs if desired.

// Copyright 2006-2010, Thomas Walters
//
// AIM-C: A C++ implementation of the Auditory Image Model
// http://www.acousticscale.org/AIMC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/*!
 * \file
 * \brief File output in the HTK format.
 *
 * \author Tom Walters <[e-mail]>
 * \author Willem van Engen <[e-mail]>
 * \date created 2006/10/30
 * \version \$Id$
 */

#ifdef _WINDOWS
#  include <direct.h>  // for _mkdir & _rmdir
#else
#  include <sys/types.h>
#  include <dirent.h>  // for opendir & friends
#endif

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <cmath>

#include "Modules/Output/FileOutputHTK.h"

namespace aimc {
FileOutputHTK::FileOutputHTK(Parameters *params) : Module(params) {
  module_description_ = "File output in HTK format";
  module_identifier_ = "htk_out";
  module_type_ = "output";
  module_version_ = "$Id$";
  
  file_suffix_ = parameters_->DefaultString("htk_out.file_suffix", ".htk");

  file_handle_ = NULL;
  header_written_ = false;
  frame_period_ms_ = 0.0f;
  previous_start_time_ = 0;
}

FileOutputHTK::~FileOutputHTK() {
  if (file_handle_ != NULL)
    CloseFile();
}

bool FileOutputHTK::InitializeInternal(const SignalBank &input) {
  channel_count_ = input.channel_count();
  buffer_length_ = input.buffer_length();
  ResetInternal();
  if (file_handle_ == NULL) {
    LOG_ERROR(_T("Couldn't initialize file output."));
    return false;
  }
  if (!header_written_) {
    WriteHeader(channel_count_ * buffer_length_);
  }
  
  return true;
}

void FileOutputHTK::ResetInternal() {
  // Finalize and close the open file, if there is one.
  if (file_handle_ != NULL && !header_written_) {
    WriteHeader(channel_count_ * buffer_length_);
  }
  if (file_handle_ != NULL)
    CloseFile();
    
  // Now open and set up the new file.
  // Check that the output file exists and is writeable.
  string out_filename;
  out_filename = global_parameters_->GetString("output_filename_base") + file_suffix_;
  if ((file_handle_ = fopen(out_filename.c_str(),
                            "wb")) == NULL) {
    LOG_ERROR(_T("Couldn't open output file '%s' for writing."),
              out_filename.c_str());
    return;
  }
  sample_count_ = 0;
  header_written_ = false;
  WriteHeader(channel_count_ * buffer_length_);
}

void FileOutputHTK::WriteHeader(int num_elements) {
  if (header_written_)
    return;

  /* HTK format file: (taken from the HTK book - section 5.10.1)
   * Header: 12 bytes in total, contains:
   * sample_count - number of samples in file (4-byte integer)(long)
   * sample_period - sample period in 100ns units (4-byte integer)(long)
   * sample_size - number of bytes per sample (2-byte integer)(short)
   * parameter_kind - a code indicating the sample kind (2-byte integer)(short)
   */

  // To be filled in when the file is done
  int32_t sample_count = 0;

  int32_t sample_period = floor(1e4 * frame_period_ms_);
  int16_t sample_size = num_elements * sizeof(float);  // NOLINT

  // User-defined coefficients with energy term
  int16_t parameter_kind = H_USER + H_E;

  // Fix endianness
  sample_count = ByteSwap32(sample_count);
  sample_period = ByteSwap32(sample_period);
  sample_size = ByteSwap16(sample_size);
  parameter_kind = ByteSwap16(parameter_kind);

  // Enter header values. sample_count is a dummy value which is filled in on
  // file close
  fwrite(&sample_count, sizeof(sample_count), 1, file_handle_);
  fwrite(&sample_period, sizeof(sample_period), 1, file_handle_);
  fwrite(&sample_size, sizeof(sample_size), 1, file_handle_);
  fwrite(&parameter_kind, sizeof(parameter_kind), 1, file_handle_);
  fflush(file_handle_);

  header_written_ = true;
}

void FileOutputHTK::Process(const SignalBank &input) {
  if (file_handle_ == NULL) {
    LOG_ERROR(_T("Couldn't process file output. No file is open."
                 "Please call FileOutputHTK::OpenFile first"));
    return;
  }

  if (!header_written_) {
    LOG_ERROR(_T("No header has been written on the output file yet. Please "
                 "call FileOutputHTK::Initialize() or FileOutputHTK::Reset() "
                 "before calling FileOutputHTK::Process()"));
    return;
  }
  float s;

  for (int ch = 0; ch < input.channel_count(); ch++) {
    for (int i = 0; i < input.buffer_length(); i++) {
      s = input.sample(ch, i);
      s = ByteSwapFloat(s);
      fwrite(&s, sizeof(s), 1, file_handle_);
    }
  }
  sample_count_++;
  frame_period_ms_ = 1000.0
                     * (input.start_time() - previous_start_time_)
                     / input.sample_rate();
  previous_start_time_ = input.start_time();
}

bool FileOutputHTK::CloseFile() {
  if (file_handle_ == NULL)
    return false;

  // Write the first 4 bytes of the file
  // with how many samples there are in the file
  // and the next 4 bytes with the frame period.
  fflush(file_handle_);
  rewind(file_handle_);
  fflush(file_handle_);
  int32_t samples = sample_count_;
  samples = ByteSwap32(samples);
  int32_t sample_period = floor(1e4 * frame_period_ms_);
  sample_period = ByteSwap32(sample_period);
  fwrite(&samples, sizeof(samples), 1, file_handle_);
  fwrite(&sample_period, sizeof(sample_period), 1, file_handle_);

  // And close the file
  fclose(file_handle_);
  file_handle_ = NULL;
  header_written_ = false;
  return true;
}

float FileOutputHTK::ByteSwapFloat(float d) {
  // Endianness fix
  float a;
  unsigned char *dst = (unsigned char *)&a;
  unsigned char *src = (unsigned char *)&d;

  dst[0] = src[3];
  dst[1] = src[2];
  dst[2] = src[1];
  dst[3] = src[0];

  return a;
}
}  // namespace aimc