cont_03.cc

这是一个从音频信号里提取特征参量的程序

// file: $isip/class/search/Context/cont_03.cc
// version: $Id: cont_03.cc,v 1.2 2002/08/15 19:54:09 alphonso Exp $
//

// isip include files
//
#include "Context.h"
#include <Sof.h>

// method: read
//
// arguments:
//  Sof& sof: (input) sof file object
//  const long tag: (input) sof object instance tag
//  const String& name: (input) sof object instance name
//
// return: a boolean value indicating status
//
// this method has the object read itself from an Sof file
//
boolean Context::read(Sof& sof_a, const long tag_a, const String& name_a) {

  // get the instance of the object from the Sof file
  //
  if (!sof_a.find(name_a, tag_a)) {
    return false;
  }

  // read the actual data from the sof file
  //
  if (!readData(sof_a)) {
    return false;
  }

  // exit gracefully
  //
  return true;
}

// method: readData
//
// arguments:
//  Sof& sof: (input) sof file object
//  const String& pname: (input) parameter name
//  long size: (input) number of bytes in file
//  boolean param: (input) is the parameter specified?
//  boolean nested: (input) is this nested?
//
// return: a boolean value indicating status
//
// this method has the object read itself from an Sof file. it assumes
// that the Sof file is already positioned correctly.
//
boolean Context::readData(Sof& sof_a, const String& pname_a, long size_a,
			     boolean param_a, boolean nested_a) {

  // if ascii, parse the start bracket
  //
  SofParser parser;
  Long value;
  
  nested_a = true;
  
  if (nested_a) {
    parser.setNest();
  }

  // set the debug level
  //
  parser.setDebug(debug_level_d);
  
  if (nested_a) {
    parser.setNest();
  }

  // load the parse
  //
  if (!parser.load(sof_a, size_a)) {

    // return a warning message
    //
    return Error::handle(name(), L"readData", Error::READ,
			 __FILE__, __LINE__, Error::WARNING);
  }           

  // read the data
  //
  if (parser.isPresent(sof_a, PARAM_CENTRAL)) {
    if (!value.readData(sof_a, PARAM_CENTRAL,
			  parser.getEntry(sof_a, PARAM_CENTRAL))) {
      return Error::handle(name(), L"readData", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }
    central_d = value;
  }
  else {
    central_d = DEF_CENTRAL_INDEX;
  }

  if (parser.isPresent(sof_a, PARAM_EXTENSION_LENGTH)) {
    if (!value.readData(sof_a, PARAM_EXTENSION_LENGTH,
			  parser.getEntry(sof_a, PARAM_EXTENSION_LENGTH))) {
      return Error::handle(name(), L"readData", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }
    ext_length_d = value;
  }
  else {
    ext_length_d = DEF_EXTENSION_LENGTH;
  }

  // get the index
  //
  if (parser.isPresent(sof_a, PARAM_INDEX)) {
    if (!index_d.readData(sof_a, PARAM_INDEX,
			  parser.getEntry(sof_a, PARAM_INDEX),
			  false, false)) {
      return Error::handle(name(), L"readData", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }
  }
  else {
    index_d = DEF_INDEX;
  }
 
  // get the buffer
  //
  if (parser.isPresent(sof_a, PARAM_BUFFER)) {
    if (!v_d.readData(sof_a, PARAM_BUFFER,
		      parser.getEntry(sof_a, PARAM_BUFFER), false, false)) {
      return Error::handle(name(), L"readData", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }
  }
  else {
    v_d.clear();
  }  

  // make sure all coefficients have been accessed
  //
  if (!parser.checkParams(sof_a)) {
    return Error::handle(name(), L"readData", Error::IO, __FILE__, __LINE__,
			 Error::WARNING);
  }
  
  // exit gracefully
  //
  return true;
}