filt_03.cc

这是一个从音频信号里提取特征参量的程序

// file: $isip/class/algo/Filter/filt_03.cc
// version: $Id: filt_03.cc,v 1.10 2002/05/31 21:57:26 picone Exp $
//

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

// method: read
//
// arguments:
//  Sof& sof: (input) sof file object
//  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 according
// to the specified name and tag
//
boolean Filter::read(Sof& sof_a, long tag_a, const String& name_a) {

  // read 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
  //
  return readData(sof_a);
}

// ------------------------------------------------------------------
// these methods have to be in the same file so they can use the same
// static parser pointer
// ------------------------------------------------------------------

static SofParser* parser_d = (SofParser*)NULL;

// method: setParser
//
// arguments:
//  SofParser* parser: (input) sof file object
//
// return: a boolean value indicating status
//
// this method sets the parser from the parent object to be used in
// the next readData method
//
boolean Filter::setParser(SofParser* parser_a) {

  // set the parser
  //
  parser_d = parser_a;

  // exit gracefully
  //
  return true;
}

// method: readData
//
// arguments:
//  Sof& sof: (input) sof file object
//  const String& pname: (input) parameter name
//  long size: (input) size in bytes of object (or FULL_OBJECT)
//  boolean param: (input) is the parameter name in the file?
//  boolean nested: (input) are we 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 Filter::readData(Sof& sof_a, const String& pname_a, long size_a,
			 boolean param_a, boolean nested_a) {
  
  // we need a parser
  // 
  if (parser_d == (SofParser*)NULL) {

    // initialize the parser
    //
    parser_d = new SofParser;

    // check if the object is nested
    //
    if (nested_a) {
      parser_d->setNest();
    }
    
    // load the parse
    //
    if (!parser_d->load(sof_a, size_a)) {

      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;
      
      // return a warning message
      //
      return Error::handle(name(), L"readData", Error::READ,
                           __FILE__, __LINE__, Error::WARNING);
    }           
  }

  // set the debug level of the parser
  //
  parser_d->setDebug(debug_level_d.getIndex());

  // get algorithm type
  //
  if (parser_d->isPresent(sof_a, PARAM_ALGORITHM)) {
    if (!ALGO_MAP.readElementData((long&)algorithm_d, sof_a, PARAM_ALGORITHM,
				  parser_d->getEntry(sof_a,
						     PARAM_ALGORITHM))) {
      
      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;
      
      // return a warning message
      //
      return Error::handle(name(), L"readData", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }      
  }
  else {
    algorithm_d = DEF_ALGORITHM;
  }
  
  // check known algorithms: invoke the proper lower-level method
  //
  if (algorithm_d == LTI) {
    return readDataCommon(sof_a, pname_a, size_a, param_a, nested_a);
  }

  // exit ungracefully
  //
  return Error::handle(name(), L"readData",
		       Error::ARG, __FILE__, __LINE__);  
}

// method: readDataCommon
//
// arguments:
//  Sof& sof: (input) sof file object
//  const String& pname: (input) parameter name
//  long size: (input) size in bytes of object (or FULL_OBJECT)
//  boolean param: (input) is the parameter name in the file?
//  boolean nested: (input) are we nested?
//
// return: a boolean value indicating status
//
// this method assumes the algorithm has been read, and proceeds to read
// the rest of the object based on the value of the algorithm
//
boolean Filter::readDataCommon(Sof& sof_a, const String& pname_a,
			       long size_a, boolean param_a,
			       boolean nested_a) {
  
  // get the mode
  //
  if (parser_d->isPresent(sof_a, PARAM_CMODE)) {
    if (!CMODE_MAP.readElementData((long&)cmode_d, sof_a, PARAM_CMODE,
                                   parser_d->getEntry(sof_a, PARAM_CMODE))) {
      
      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;
      
      // return a warning message
      //
      return Error::handle(name(), L"readDataCommon", Error::READ,
                           __FILE__, __LINE__, Error::WARNING);
    }
  }
  else {
    cmode_d = DEF_CMODE;
  }
  setComputeMode(cmode_d);
  
  // get the computational mode
  //
  if (parser_d->isPresent(sof_a, PARAM_DMODE)) {
    if (!DMODE_MAP.readElementData((long&)dmode_d, sof_a, PARAM_DMODE,
                                   parser_d->getEntry(sof_a, PARAM_DMODE))) {
      
      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;
      
      // return a warning message
      //
      return Error::handle(name(), L"readDataCommon", Error::READ,
                           __FILE__, __LINE__, Error::WARNING);
    }
  }
  else {
    dmode_d = DEF_DMODE;
  }
  setDataMode(dmode_d);
  
  // get the implementation
  //
  if (parser_d->isPresent(sof_a, PARAM_IMPLEMENTATION)) {
    if (!IMPL_MAP.readElementData((long&)implementation_d, sof_a,
				  PARAM_IMPLEMENTATION,
				  parser_d->getEntry(sof_a,
						     PARAM_IMPLEMENTATION))) {
      
      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;
      
      // return a warning message
      //
      return Error::handle(name(), L"readDataCommon", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }      
  }
  else {
    implementation_d = DEF_IMPLEMENTATION;
  }

  // get the ma_coef
  //
  if (parser_d->isPresent(sof_a, PARAM_MA_COEF)) {
    if (!ma_coef_d.readData(sof_a, PARAM_MA_COEF,
			    parser_d->getEntry(sof_a, PARAM_MA_COEF),
			    false, false)) {

      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;

      // return a warning message
      //
      return Error::handle(name(), L"readDataCommon", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }       
  }
  else {
    ma_coef_d.assign(DEF_MA_COEF);
  }

  // get the ar_coef
  //
  if (parser_d->isPresent(sof_a, PARAM_AR_COEF)) {
    if (!ar_coef_d.readData(sof_a, PARAM_AR_COEF,
			    parser_d->getEntry(sof_a, PARAM_AR_COEF),
			    false, false)) {

      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;

      // return a warning message
      //
      return Error::handle(name(), L"readDataCommon", Error::READ,
			   __FILE__, __LINE__, Error::WARNING);
    }       
  }
  else {
    ar_coef_d.assign(DEF_AR_COEF);
  }
  
  // get the ma_lag
  //
  if (parser_d->isPresent(sof_a, PARAM_MA_LAG)) {
    if (!ma_lag_d.readData(sof_a, PARAM_MA_LAG,
			   parser_d->getEntry(sof_a, PARAM_MA_LAG),
			   false, false)) {

      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;

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

    // if the lag wasn't specified, the default is a ramp
    //
    ma_lag_d.setLength(ma_coef_d.length());
    ma_lag_d.ramp((long)0, (long)-1);
  }

  // get the ar_lag
  //
  if (parser_d->isPresent(sof_a, PARAM_AR_LAG)) {
    if (!ar_lag_d.readData(sof_a, PARAM_AR_LAG,
			   parser_d->getEntry(sof_a, PARAM_AR_LAG),
			   false, false)) {

      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;

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

    // if the lag wasn't specified, the default is a ramp
    //
    ar_lag_d.setLength(ar_coef_d.length());
    ar_lag_d.ramp((long)-1, (long)-1);
  }

  // the filter is no longer valid
  //
  is_valid_d = false;
  
  // get the debug level
  //
  if (parser_d->isPresent(sof_a, PARAM_DBGL)) {
    if (!debug_level_d.readData(sof_a, PARAM_DBGL,
				parser_d->getEntry(sof_a, PARAM_DBGL))) {
      
      // delete the parser
      //
      delete parser_d;
      parser_d = (SofParser*)NULL;
      
      // return a warning message
      //
      return Error::handle(name(), L"readDataCommon", Error::IO,
			   __FILE__, __LINE__, Error::WARNING);
    }
  }
  else {
    debug_level_d = Integral::DEF_DEBUG;
  }

  // check that all parameters are accounted for
  //
  if (!parser_d->checkParams(sof_a)) {

    // delete the parser
    //
    delete parser_d;
    parser_d = (SofParser*)NULL;

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

  // delete the parser
  //
  delete parser_d;
  parser_d = (SofParser*)NULL;
  
  // exit gracefully
  //
  return true;
}