out_06.cc

这是一个从音频信号里提取特征参量的程序

// file: $isip/class/algo/Output/out_06.cc
// version: $Id: out_06.cc,v 1.3 2002/07/16 16:36:29 gao Exp $
//

// isip include files
//
#include "Output.h"

// method: computeFeatures
//
// arguments:
//  Vector<AlgorithmData>& output: (output) output data
//  const Vector< CircularBuffer<AlgorithmData> >& input: (input) input data
//
// return: a boolean value indicating status
//
// this method write out features data
//
boolean Output::computeFeatures(Vector<AlgorithmData>& output_a,
				const Vector< CircularBuffer<AlgorithmData> >&
				input_a) {

  if (implementation_d != FEATURES) {
    return Error::handle(name(), L"computeFeatures", ERR_UNKIMP,
			 __FILE__, __LINE__);
  }

  // determine the number of input channels and force the output to be
  // that number
  //
  long len = input_a.length();
  output_a.setLength(len);

  // loop over the channels and call the compute method
  //
  for (long c = 0; c < len; c++) {
    
    // display the channel number
    //
    displayChannel(c);
    
    // copy the data
    //
    output_a(c).assign(input_a(c)(0));

    // possibly display the data
    //
    display(output_a(c), input_a(c)(0), name());
  }

  AlgorithmData::DATA_TYPE dtype = input_a(0)(0).getDataType() ;
    
  if (dtype == AlgorithmData::VECTOR_FLOAT) {
    // write the data
    //
    feature_output_d.writeFeatureData(output_a);
  }

  else {
    return Error::handle(name(), L"computeFeatures",
			 ERR_UNKIMP, __FILE__, __LINE__);
  }
    
  // possibly display the data
  //  
  display(output_a, input_a, name());
  
  // exit gracefully
  //
  return true;
}



// method: computeSampledData
//
// arguments:
//  Vector<AlgorithmData>& output: (output) output data
//  const Vector< CircularBuffer<AlgorithmData> >& input: (input) input data
//
// return: a boolean value indicating status
//
// this method write out the sampled data
//
boolean Output::computeSampledData(Vector<AlgorithmData>& output_a,
				   const Vector< CircularBuffer<AlgorithmData> >& input_a) {


  if (implementation_d != SAMPLED_DATA) {
    return Error::handle(name(), L"computeSampledData", ERR_UNKIMP,
			 __FILE__, __LINE__);
  }

  // determine the number of input channels and force the output to be
  // that number
  //
  long len = input_a.length();
  output_a.setLength(len);

  // loop over the channels and call the compute method
  //
  for (long c = 0; c < len; c++) {
    
    // display the channel number
    //
    displayChannel(c);
    
    // copy the data
    //
    output_a(c).assign(input_a(c)(0));

    // possibly display the data
    //
    display(output_a(c), input_a(c)(0), name());
  }
  
  AlgorithmData::DATA_TYPE dtype = input_a(0)(0).getDataType() ;

  // calculate the whole frames needed to process
  //
  double  num_frames = signal_duration_d / frame_dur_d;
  long frame = (long)Integral::round(num_frames);
  
  if (dtype == AlgorithmData::VECTOR_FLOAT) {
    
    // write the data
    //
      Vector <VectorFloat> temp;
      temp.setLength(output_a.length());
      for (long i = 0; i < output_a.length(); i++) {
	temp(i).assign(output_a(i).getVectorFloat());
	
	if (leftover_samps_d == 0) {
	}
	else if (leftover_samps_d < output_a(i).getVectorFloat().length() &&
		 dmode_d == SAMPLE_BASED && frame_index_d == frame - 1) {
	  temp(i).setLength(leftover_samps_d);
	}
      }
      audio_output_d.writeAudioData(temp);
  }

  else {
    return Error::handle(name(), L"computeSampledData", ERR_UNKIMP,
			 __FILE__, __LINE__);
  }
  
  // possibly display the data
  //
  display(output_a, input_a, name());
    
  // exit gracefully
  //
  return true;
}