annotate src/Modules/Input/ModuleFileInput.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, Willem van Engen, 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 Audio file input
 *
 *  \author Willem van Engen <[e-mail]>
 *  \author Thomas Walters <[e-mail]>
 *  \date created 2006/09/21
 *  \version \$Id$
 */

#include <vector>

#include "Modules/Input/ModuleFileInput.h"

namespace aimc {
ModuleFileInput::ModuleFileInput(Parameters *params) : Module(params) {
  module_description_ = "File input using libsndfile";
  module_identifier_ = "file_input";
  module_type_ = "input";
  module_version_ = "$Id$";

  file_handle_ = NULL;
  buffer_length_ = parameters_->DefaultInt("input.buffersize", 1024);

  file_position_samples_ = 0;
  file_loaded_ = false;
  audio_channels_ = 0;
  sample_rate_ = 0.0f;
}

ModuleFileInput::~ModuleFileInput() {
  if (file_handle_ != NULL) {
    sf_close(file_handle_);
    file_handle_ = NULL;
  }
}

void ModuleFileInput::ResetInternal() {
  // If there's a file open. Close it.
  if (file_handle_ != NULL) {
    sf_close(file_handle_);
    file_handle_ = NULL;
  }
  // Open a file
  SF_INFO sfinfo;
  memset(reinterpret_cast<void*>(&sfinfo), 0, sizeof(SF_INFO));

  file_loaded_ = false;
  file_handle_ = sf_open(global_parameters_->GetString("input_filename"),
                         SFM_READ,
                         &sfinfo);

  if (file_handle_ == NULL) {
    /*! \todo Also display error reason
     */
    LOG_ERROR(_T("Couldn't read audio file '%s'"),
              global_parameters_->GetString("input_filename"));
    return;
  }
  
  file_loaded_ = true;
  done_ = false;
  audio_channels_ = sfinfo.channels;
  sample_rate_ = sfinfo.samplerate;
  file_position_samples_ = 0;

  if (audio_channels_ < 1 || buffer_length_ < 1 || sample_rate_ < 0.0f) {
    LOG_ERROR(_T("Problem with file: audio_channels = %d, buffer_length_ = %d, sample_rate = %f"), audio_channels_, buffer_length_, sample_rate_);
    return;
  }

  output_.Initialize(audio_channels_, buffer_length_, sample_rate_);
  output_.set_start_time(0);
}

bool ModuleFileInput::InitializeInternal(const SignalBank& input) {
  ResetInternal();
  return true;
}

void ModuleFileInput::Process(const SignalBank& input) {
  if (!file_loaded_)
    return;
  sf_count_t read;
  vector<float> buffer;
  buffer.resize(buffer_length_ * audio_channels_);

  // Read buffersize bytes into buffer
  read = sf_readf_float(file_handle_, &buffer[0], buffer_length_);
	
  // Place the contents of the buffer into the signal bank
  int counter = 0;
  for (int i = 0; i < read; ++i) {
	for (int c = 0; c < audio_channels_; ++c) {
      output_.set_sample(c, i, buffer[counter]);
      ++counter;
    }
  }

  // If the number of samples read is less than the buffer length, the end
  // of the file has been reached.
  if (read < buffer_length_) {
    // Zero samples at end
	for (int i = read; i < buffer_length_; ++i) {
	  for (int c = 0; c < audio_channels_; ++c) {
        output_.set_sample(c, i, 0.0f);
      }
    }
    // When we're past the end of the buffer, set the
    // module state to 'done' and exit.
    if (read == 0)
      done_ = true;
      return;
  }

  // Update time.
  output_.set_start_time(file_position_samples_);
  file_position_samples_ += read;
  PushOutput();
}
}  // namespace aimc