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   源码介绍

---

本例支持qt4.8以上版本，实现了对地震格式seg-y数据的读取，显示，初级FK变换，二维线性插值的内容。

seg-y 文件读写类

//segy.cpp

#include<stdio.h>

#include <iostream>

#include <string.h>

#include<math.h>

#include<errno.h>

#include"segy.h"

#include<qstring.h>

#include<qdatastream.h>

using namespace std;

//#pragma warning(disable:4996)

//*********Public Functions************

//=========

void SEGY_RW::get_trace_num()

{

 Input_SEGY_File.seekg(0.0, ios::end);

 Q_INT64 pos = Input_SEGY_File.tellg();

 address_file_end=pos;//for judging whether the trace number which is input by users exceeds the up limitation.

 //Calculate how many traces in this record.

 //TraceNumber =int( (pos - SEGY_ASCII_HDR_SIZE - SEGY_VOLUMN_HDR_SIZE) / (volumn_hdr.samples_per_trace *4   SEGY_TRACE_HDR_SIZE) ) ;

 TraceNumber = volumn_hdr.traces_per_record;

 //cout<<"posgetNum: "<<address_file_end<<endl;

}

//=======

//Translate the ECBICD text to ASCII text for display

char SEGY_RW::swapEBCDICcodeToASCIIcode(unsigned char c)

{

 char t;

 switch(c)

 {

 case 12: t=12; break;

 case 13: t=13; break;

 case 64: t=32; break;

 case 74: t=99; break;

 case 75: t=46; break;

 case 76: t=60; break;

 case 77: t=40; break;

 case 78: t=43; break;

 case 80: t=38; break;

 case 90: t=33; break;

 case 91: t=36; break;

 case 92: t=42; break;

 case 93: t=41; break;

 case 94: t=59; break;

 case 96: t=45; break;

 case 97: t=47; break;

 case 107:t=44; break;

 case 108:t=37; break;

 case 109:t=95; break;

 case 110:t=62; break;

 case 111:t=63; break;

 case 122:t=58; break;

 case 123:t=35; break;

 case 124:t=64; break;

 case 125:t=39; break;

 case 126:t=61; break;

 case 127:t=34; break;

 case 129:t=97; break;

 case 130:t=98; break;

 case 131:t=99; break;

 case 132:t=100;break;

 case 133:t=101;break;

 case 134:t=102;break;

 case 135:t=103;break;

 case 136:t=104;break;

 case 137:t=105;break;

 case 145:t=106;break;

 case 146:t=107;break;

 case 147:t=108;break;

 case 148:t=109;break;

 case 149:t=110;break;

 case 150:t=111;break;

 case 151:t=112;break;

 case 152:t=113;break;

 case 153:t=114;break;

 case 162:t=115;break;

 case 163:t=116;break;

 case 164:t=117;break;

 case 165:t=118;break;

 case 166:t=119;break;

 case 167:t=120;break;

 case 168:t=121;break;

 case 169:t=122;break;

 case 193:t=65; break;

 case 194:t=66; break;

 case 195:t=67; break;

 case 196:t=68; break;

 case 197:t=69; break;

 case 198:t=70; break;

 case 199:t=71; break;

 case 200:t=72; break;

 case 201:t=73; break;

 case 209:t=74; break;

 case 210:t=75; break;

 case 211:t=76; break;

 case 212:t=77; break;

 case 213:t=78; break;

 case 214:t=79; break;

 case 215:t=80; break;

 case 216:t=81; break;

 case 217:t=82; break;

 case 226:t=83; break;

 case 227:t=84; break;

 case 228:t=85; break;

 case 229:t=86; break;

 case 230:t=87; break;

 case 231:t=88; break;

 case 232:t=89; break;

 case 233:t=90; break;

 case 240:t=48; break;

 case 241:t=49; break;

 case 242:t=50; break;

 case 243:t=51; break;

 case 244:t=52; break;

 case 245:t=53; break;

 case 246:t=54; break;

 case 247:t=55; break;

 case 248:t=56; break;

 case 249:t=57; break;

 default: t=32;

 }

 return t;

}

//Read and Write Ascii header

void SEGY_RW::Read_AsciiHeader(string &input_segy_file)

{

 //Read Ascii Header

 Input_SEGY_File_Name=input_segy_file;

 for (int i = 0; i < SEGY_ASCII_HDR_SIZE; i   )

 {

 Input_SEGY_File.read((char *) &this->ascii_hdr.buffer[i], sizeof(Q_INT8));

 //translate to txt

 if(m_iOSFormat==UNIX_FORMAT)

 display_ascii_hdr[i]=swapEBCDICcodeToASCIIcode(ascii_hdr.buffer[i]);

 }

}

//Write Ascii header as txt file

void SEGY_RW::Write_Asciihdr2txt()

{

// char buffer[300];

 //getcwd(buffer, 300);

 // strcat(buffer, "EBCDIC.txt");

 fstream Ascii_txt("EBCDIC.txt",ios::out);

 Ascii_txt<<display_ascii_hdr;

 Ascii_txt.close();

}

//==//Write Ascii header

void SEGY_RW::Write_AsciiHeader(string &output_segy_file)

{

 Output_SEGY_File_Name=output_segy_file;

 for (int i = 0; i < SEGY_ASCII_HDR_SIZE; i   )

 {

 Output_SEGY_File.write((char *) &this->ascii_hdr.buffer[i], sizeof(Q_INT8));

 }

}

//Read and Write Binary volumn header

void SEGY_RW::Read_VolumnHeader(string &input_segy_file)

{

 Input_SEGY_File_Name=input_segy_file;

 //Read Binary Volumn Header

 Input_SEGY_File.read((char *) &volumn_hdr.job_id_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &volumn_hdr.line_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &volumn_hdr.reel_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &volumn_hdr.traces_per_record, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.aux_traces_per_record, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sample_data_interval_ms, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.original_data_interval_ms, sizeof(Q_INT16));//

 Input_SEGY_File.read((char *) &volumn_hdr.samples_per_trace, sizeof(Q_INT16));//

 Input_SEGY_File.read((char *) &volumn_hdr.original_samples_per_trace, sizeof(Q_INT16));//

 Input_SEGY_File.read((char *) &volumn_hdr.data_sample_format_code, sizeof(Q_INT16)); //

 Input_SEGY_File.read((char *) &volumn_hdr.CDP_fold, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.trace_sorting_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.vertical_sum_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sweep_frequency_start_hz, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sweep_frequency_end_hz, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sweep_length_ms, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sweep_type_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.trace_number_of_sweep_channel, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sweep_trace_taper_length_start_ms, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.sweep_trace_taper_length_end_ms, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.taper_type_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.correlated_data_traces_flag, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.binary_gain_recovered_flag, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.amplitude_recovery_method_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.measurement_system, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.impulse_signal_polarity, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &volumn_hdr.vibratory_polarity_code, sizeof(Q_INT16));

 //Judge the sampling format

 if(SEGY_RW::volumn_hdr.data_sample_format_code<= 8)

 {

 m_iOSFormat = PC_FORMAT;

 cout<<"Attention please: Your seismic datum are IEEE float format!"<<endl;

 }

 else

 {

 m_iOSFormat = UNIX_FORMAT;

 cout<<"Attention please: Your seismic datum are IBM float format!"<<endl;

 }

 if(m_iOSFormat==UNIX_FORMAT){

 volumn_hdr.job_id_number=swapDataToLong(volumn_hdr.job_id_number);

 volumn_hdr.line_number=swapDataToLong(volumn_hdr.line_number);

 volumn_hdr.reel_number=swapDataToLong(volumn_hdr.reel_number);

 volumn_hdr.traces_per_record=swapDataToShort(volumn_hdr.traces_per_record);

 volumn_hdr.aux_traces_per_record=swapDataToShort(volumn_hdr.aux_traces_per_record);

 volumn_hdr.sample_data_interval_ms=swapDataToShort(volumn_hdr.sample_data_interval_ms);

 volumn_hdr.original_data_interval_ms=swapDataToShort(volumn_hdr.original_data_interval_ms);//

 volumn_hdr.samples_per_trace=swapDataToShort(volumn_hdr.samples_per_trace);

 volumn_hdr.original_samples_per_trace=swapDataToShort(volumn_hdr.original_samples_per_trace);//

 volumn_hdr.data_sample_format_code=swapDataToShort(volumn_hdr.data_sample_format_code); //

 volumn_hdr.CDP_fold=swapDataToShort(volumn_hdr.CDP_fold);

 volumn_hdr.trace_sorting_code=swapDataToShort(volumn_hdr.trace_sorting_code);

 volumn_hdr.vertical_sum_code=swapDataToShort(volumn_hdr.vertical_sum_code);

 volumn_hdr.sweep_frequency_start_hz=swapDataToShort(volumn_hdr.sweep_frequency_start_hz);

 volumn_hdr.sweep_frequency_end_hz=swapDataToShort(volumn_hdr.sweep_frequency_end_hz);

 volumn_hdr.sweep_length_ms=swapDataToShort(volumn_hdr.sweep_length_ms);

 volumn_hdr.sweep_type_code=swapDataToShort(volumn_hdr.sweep_type_code);

 volumn_hdr.trace_number_of_sweep_channel=swapDataToShort(volumn_hdr.trace_number_of_sweep_channel);

 volumn_hdr.sweep_trace_taper_length_start_ms=swapDataToShort(volumn_hdr.sweep_trace_taper_length_start_ms);

 volumn_hdr.sweep_trace_taper_length_end_ms=swapDataToShort(volumn_hdr.sweep_trace_taper_length_end_ms);

 volumn_hdr.taper_type_code=swapDataToShort(volumn_hdr.taper_type_code);

 volumn_hdr.correlated_data_traces_flag=swapDataToShort(volumn_hdr.correlated_data_traces_flag);

 volumn_hdr.binary_gain_recovered_flag=swapDataToShort(volumn_hdr.binary_gain_recovered_flag);

 volumn_hdr.amplitude_recovery_method_code=swapDataToShort(volumn_hdr.amplitude_recovery_method_code);

 volumn_hdr.measurement_system=swapDataToShort(volumn_hdr.measurement_system);

 volumn_hdr.impulse_signal_polarity=swapDataToShort(volumn_hdr.impulse_signal_polarity);

 volumn_hdr.vibratory_polarity_code=swapDataToShort(volumn_hdr.vibratory_polarity_code);

 }

 for( int i = 0; i < 340; i   )

 {

 Input_SEGY_File.read((char *) &volumn_hdr.buffer[i], sizeof(Q_INT8));

 }

}

void SEGY_RW::Write_VolumnHeader(string &output_segy_file)

{

 Output_SEGY_File_Name=output_segy_file;

 //Write Binary Volumn Header

 Output_SEGY_File.write((char *) &volumn_hdr.job_id_number, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &volumn_hdr.line_number, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &volumn_hdr.reel_number, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &volumn_hdr.traces_per_record, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.aux_traces_per_record, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sample_data_interval_ms, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.original_data_interval_ms, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.samples_per_trace, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.original_samples_per_trace, sizeof(Q_INT16));

 volumn_hdr.data_sample_format_code=5;

 Output_SEGY_File.write((char *) &volumn_hdr.data_sample_format_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.CDP_fold, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.trace_sorting_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.vertical_sum_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sweep_frequency_start_hz, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sweep_frequency_end_hz, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sweep_length_ms, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sweep_type_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.trace_number_of_sweep_channel, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sweep_trace_taper_length_start_ms, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.sweep_trace_taper_length_end_ms, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.taper_type_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.correlated_data_traces_flag, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.binary_gain_recovered_flag, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.amplitude_recovery_method_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.measurement_system, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.impulse_signal_polarity, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &volumn_hdr.vibratory_polarity_code, sizeof(Q_INT16));

 //

 for( int i = 0; i < 340; i   )

 {

 Output_SEGY_File.write((char *) &volumn_hdr.buffer[i], sizeof(Q_INT8));

 }

}

//Initial trace header and trace datum

void SEGY_RW::Initialize_Trace()

{

 //Initialize Trace Header

 trace_hdr.trace_sequence_number_within_line=0;

 trace_hdr.trace_sequence_number_within_reel=0;

 trace_hdr.original_field_record_number=0;

 trace_hdr.trace_sequence_number_within_original_field_record=0;

 trace_hdr.energy_source_point_number=0;

 trace_hdr.cdp_ensemble_number=0;

 trace_hdr.trace_sequence_number_within_cdp_ensemble=0;

 trace_hdr.trace_identification_code=0;

 trace_hdr.number_of_vertically_summed_traces_yielding_this_trace=0;

 trace_hdr.number_of_horizontally_stacked_traced_yielding_this_trace=0;

 trace_hdr.data_use=0;

 trace_hdr.distance_from_source_point_to_receiver_group=0;

 trace_hdr.receiver_group_elevation=0;

 trace_hdr.surface_elevation_at_source=0;

 trace_hdr.source_depth_below_surface=0;

 trace_hdr.datum_elevation_at_receiver_group=0;

 trace_hdr.datum_elevation_at_source=0;

 trace_hdr.water_depth_at_source=0;

 trace_hdr.water_depth_at_receiver_group=0;

 trace_hdr.scalar_for_elevations_and_depths=0;

 trace_hdr.scalar_for_coordinates=0;

 trace_hdr.x_source_coordinate=0;

 trace_hdr.y_source_coordinate=0;

 trace_hdr.x_receiver_group_coordinate=0;

 trace_hdr.y_receiver_group_coordinate=0;

 trace_hdr.coordinate_units=0;

 trace_hdr.weathering_velocity=0;

 trace_hdr.subweathering_velocity=0;

 trace_hdr.uphole_time_at_source=0;

 trace_hdr.uphole_time_at_group=0;

 trace_hdr.source_static_correction=0;

 trace_hdr.group_static_correction=0;

 trace_hdr.total_static_applied=0;

 trace_hdr.lag_time_a=0;

 trace_hdr.lag_time_b=0;

 trace_hdr.delay_according_time=0;

 trace_hdr.mute_time_start=0;

 trace_hdr.mute_time_end=0;

 trace_hdr.samples_in_this_trace=0;

 trace_hdr.sample_intervall=0;

 trace_hdr.gain_type_instruments=0;

 trace_hdr.igc=0;

 trace_hdr.igi=0;

 trace_hdr.corr=0;

 trace_hdr.sfs=0;

 trace_hdr.sfe=0;

 trace_hdr.slen=0;

 trace_hdr.styp=0;

 trace_hdr.stas=0;

 trace_hdr.stae=0;

 trace_hdr.tatyp=0;

 trace_hdr.afilf=0;

 trace_hdr.afils=0;

 trace_hdr.nofilf=0;

 trace_hdr.nofils=0;

 trace_hdr.lcf=0;

 trace_hdr.hcf=0;

 trace_hdr.lcs=0;

 trace_hdr.hcs=0;

 trace_hdr.year=0;

 trace_hdr.day=0;

 trace_hdr.hour=0;

 trace_hdr.minute=0;

 trace_hdr.sec=0;

 trace_hdr.timbas=0;

 trace_hdr.trwf=0;

 trace_hdr.grnors=0;

 trace_hdr.grnofr=0;

 trace_hdr.grnlof=0;

 trace_hdr.gaps=0;

 trace_hdr.otrav=0;

 for (int i = 0; i < 15; i    )

 trace_hdr.user_define[i]=0;

 //Initialize Trace Data

 trace_data=new float [Sample_Number];

 for(int i=0;i<Sample_Number;i  )

 trace_data[i]=0;

}

//======

SEGY_RW::SEGY_RW( string &input_segy_file,string &output_segy_file)

{

 trace_data = NULL;

 pFileName = NULL;

 Input_SEGY_File_Name=input_segy_file;

 Output_SEGY_File_Name=output_segy_file;

 //Open Input Seismic Data File

 Input_SEGY_File.open(Input_SEGY_File_Name.c_str(), ios::in | ios::binary );

 if(!Input_SEGY_File.is_open())

 {

 cout<<"ERROR: Can't Open Input Seismic Data File";

 exit(1);

 }

 //Open Output Seismic Data File

 Output_SEGY_File.open(Output_SEGY_File_Name.c_str(), ios::out | ios::binary|ios::trunc );

 if(!Output_SEGY_File.is_open())

 {

 cout<<"ERROR: Can't Open Output Seismic Data File";

 exit(1);

 }

 //

 //pFileName=fopen("E:\\PROJECT\\Datum\\Seismic_Data\\Yraw_testline.sgy","rb");

 //if(pFileName==NULL){cout<<"erro input!";};

 char ch[1000];

 strcpy(ch,input_segy_file.c_str());

 //cout<<ch<<endl;

 //errno_t err;

 //int err;

 // err = fopen_s( &pFileName, ch,"rb"); //assign the value of the pFileName

// err = fopen( &pFileName, ch,"rb");

// if ( errno!=0)

// {

// printf( "打开文件失败,错误代码=%d\n",err);

// }

 m_iOSFormat = PC_FORMAT;//

 //Read Ascii Header

 Read_AsciiHeader(input_segy_file);

 //Read Binary Volumn Header

 Read_VolumnHeader(input_segy_file);

 //Write Ascii Header

 Write_AsciiHeader(output_segy_file);

 // Write_Asciihdr2txt();

 //Write Binary Volumn Header

 Write_VolumnHeader(output_segy_file);

 //Seismic Data Parameters

 this->get_trace_num();

 SampleInterval=volumn_hdr.sample_data_interval_ms;

 Sample_Number=volumn_hdr.samples_per_trace;

 //Initialize Trace Header and Trace data

 Initialize_Trace();

 //Close Seismic Data File

 Input_SEGY_File.close( );

 Output_SEGY_File.close( );

}

//========

SEGY_RW::~SEGY_RW()

{

 //Seismic_Stratify_File_Input.close();

 if(trace_data!=NULL)

 delete [] trace_data;

 if(pFileName!=NULL)

 fclose(pFileName);

}

//========

void SEGY_RW::Read_TraceHeader(int trace_id)

{

 if(trace_id<1||trace_id>TraceNumber) {cout<<"Your trace number is too small or large!"<<endl; exit(1);}

 //here we must use Q_INT64 instead of int ,because of the support to large file .

 Q_INT64 pos = (Q_INT64)3600   ( (Q_INT64)trace_id - (Q_INT64)1) * ( (Q_INT64)240   (Q_INT64)Sample_Number * sizeof(float));//

 Input_SEGY_File.open(Input_SEGY_File_Name.c_str(),ios_base::in| ios::binary);

 Input_SEGY_File.seekg(pos);//

 // fseek( pFileName,pos, SEEK_SET );

 // if(ftell(pFileName)>=address_file_end){cout<<"exceed the trace range: TraceHeader!"<<endl;};

 //cout<<"telltracehdrdata: "<<_ftelli64(pFileName)<<endl<<"address "<<address_file_end<<endl<<"Tracehdrpos: "<<pos<<endl;

 //Read Trace Header

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_line, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_reel, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.original_field_record_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_original_field_record, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.energy_source_point_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.cdp_ensemble_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_cdp_ensemble, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_identification_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.number_of_vertically_summed_traces_yielding_this_trace, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.number_of_horizontally_stacked_traced_yielding_this_trace, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.data_use, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.distance_from_source_point_to_receiver_group, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.receiver_group_elevation, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.surface_elevation_at_source, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.source_depth_below_surface, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.datum_elevation_at_receiver_group, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.datum_elevation_at_source, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.water_depth_at_source, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.water_depth_at_receiver_group, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.scalar_for_elevations_and_depths, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.scalar_for_coordinates, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.x_source_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.y_source_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.x_receiver_group_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.y_receiver_group_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.coordinate_units, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.weathering_velocity, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.subweathering_velocity, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.uphole_time_at_source, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.uphole_time_at_group, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.source_static_correction, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.group_static_correction, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.total_static_applied, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lag_time_a, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lag_time_b, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.delay_according_time, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.mute_time_start, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.mute_time_end, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.samples_in_this_trace, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sample_intervall, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.gain_type_instruments, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.igc, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.igi, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.corr, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sfs, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sfe, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.slen, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.styp, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.stas, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.stae, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.tatyp, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.afilf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.afils, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.nofilf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.nofils, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lcf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.hcf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lcs, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.hcs, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.year, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.day, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.hour, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.minute, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sec, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.timbas, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.trwf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.grnors, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.grnofr, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.grnlof, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.gaps, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.otrav, sizeof(Q_INT16));

 for (int i = 0; i < 15; i    )

 {

 Input_SEGY_File.read((char *) & trace_hdr.user_define[i], sizeof(Q_INT32));

 }

 if(m_iOSFormat==UNIX_FORMAT){ //cout<<"IBM"<<endl;

 trace_hdr.trace_sequence_number_within_line = swapDataToLong ( trace_hdr.trace_sequence_number_within_line ) ;

 trace_hdr.trace_sequence_number_within_reel = swapDataToLong ( trace_hdr.trace_sequence_number_within_reel ) ;

 trace_hdr.original_field_record_number = swapDataToLong ( trace_hdr.original_field_record_number ) ;

 trace_hdr.trace_sequence_number_within_original_field_record = swapDataToLong ( trace_hdr.trace_sequence_number_within_original_field_record ) ;

 trace_hdr.energy_source_point_number = swapDataToLong ( trace_hdr.energy_source_point_number ) ;

 trace_hdr.cdp_ensemble_number = swapDataToLong ( trace_hdr.cdp_ensemble_number ) ;

 trace_hdr.trace_sequence_number_within_cdp_ensemble = swapDataToLong ( trace_hdr.trace_sequence_number_within_cdp_ensemble ) ;

 trace_hdr.trace_identification_code = swapDataToShort ( trace_hdr.trace_identification_code ) ;

 trace_hdr.number_of_vertically_summed_traces_yielding_this_trace = swapDataToShort ( trace_hdr.number_of_vertically_summed_traces_yielding_this_trace ) ;

 trace_hdr.number_of_horizontally_stacked_traced_yielding_this_trace = swapDataToShort ( trace_hdr.number_of_horizontally_stacked_traced_yielding_this_trace ) ;

 trace_hdr.data_use = swapDataToShort ( trace_hdr.data_use ) ;

 trace_hdr.distance_from_source_point_to_receiver_group = swapDataToLong ( trace_hdr.distance_from_source_point_to_receiver_group ) ;

 trace_hdr.receiver_group_elevation = swapDataToLong ( trace_hdr.receiver_group_elevation ) ;

 trace_hdr.surface_elevation_at_source = swapDataToLong ( trace_hdr.surface_elevation_at_source ) ;

 trace_hdr.source_depth_below_surface = swapDataToLong ( trace_hdr.source_depth_below_surface ) ;

 trace_hdr.datum_elevation_at_receiver_group = swapDataToLong ( trace_hdr.datum_elevation_at_receiver_group ) ;

 trace_hdr.datum_elevation_at_source = swapDataToLong ( trace_hdr.datum_elevation_at_source ) ;

 trace_hdr.water_depth_at_source = swapDataToLong ( trace_hdr.water_depth_at_source ) ;

 trace_hdr.water_depth_at_receiver_group = swapDataToLong ( trace_hdr.water_depth_at_receiver_group ) ;

 trace_hdr.scalar_for_elevations_and_depths = swapDataToShort ( trace_hdr.scalar_for_elevations_and_depths ) ;

 trace_hdr.scalar_for_coordinates = swapDataToShort ( trace_hdr.scalar_for_coordinates ) ;

 trace_hdr.x_source_coordinate = swapDataToLong ( trace_hdr.x_source_coordinate ) ;

 trace_hdr.y_source_coordinate = swapDataToLong ( trace_hdr.y_source_coordinate ) ;

 trace_hdr.x_receiver_group_coordinate = swapDataToLong ( trace_hdr.x_receiver_group_coordinate ) ;

 trace_hdr.y_receiver_group_coordinate = swapDataToLong ( trace_hdr.y_receiver_group_coordinate ) ;

 trace_hdr.coordinate_units = swapDataToShort ( trace_hdr.coordinate_units ) ;

 trace_hdr.weathering_velocity = swapDataToShort ( trace_hdr.weathering_velocity ) ;

 trace_hdr.subweathering_velocity = swapDataToShort ( trace_hdr.subweathering_velocity ) ;

 trace_hdr.uphole_time_at_source = swapDataToShort ( trace_hdr.uphole_time_at_source ) ;

 trace_hdr.uphole_time_at_group = swapDataToShort ( trace_hdr.uphole_time_at_group ) ;

 trace_hdr.source_static_correction = swapDataToShort ( trace_hdr.source_static_correction ) ;

 trace_hdr.group_static_correction = swapDataToShort ( trace_hdr.group_static_correction ) ;

 trace_hdr.total_static_applied = swapDataToShort ( trace_hdr.total_static_applied ) ;

 trace_hdr.lag_time_a = swapDataToShort ( trace_hdr.lag_time_a ) ;

 trace_hdr.lag_time_b = swapDataToShort ( trace_hdr.lag_time_b ) ;

 trace_hdr.delay_according_time = swapDataToShort ( trace_hdr.delay_according_time ) ;

 trace_hdr.mute_time_start = swapDataToShort ( trace_hdr.mute_time_start ) ;

 trace_hdr.mute_time_end = swapDataToShort ( trace_hdr.mute_time_end ) ;

 trace_hdr.samples_in_this_trace = swapDataToShort ( trace_hdr.samples_in_this_trace ) ;

 trace_hdr.sample_intervall = swapDataToShort ( trace_hdr.sample_intervall ) ;

 trace_hdr.gain_type_instruments = swapDataToShort ( trace_hdr.gain_type_instruments ) ;

 trace_hdr.igc = swapDataToShort ( trace_hdr.igc ) ;

 trace_hdr.igi = swapDataToShort ( trace_hdr.igi ) ;

 trace_hdr.corr = swapDataToShort ( trace_hdr.corr ) ;

 trace_hdr.sfs = swapDataToShort ( trace_hdr.sfs ) ;

 trace_hdr.sfe = swapDataToShort ( trace_hdr.sfe ) ;

 trace_hdr.slen = swapDataToShort ( trace_hdr.slen ) ;

 trace_hdr.styp = swapDataToShort ( trace_hdr.styp ) ;

 trace_hdr.stas = swapDataToShort ( trace_hdr.stas ) ;

 trace_hdr.stae = swapDataToShort ( trace_hdr.stae ) ;

 trace_hdr.tatyp = swapDataToShort ( trace_hdr.tatyp ) ;

 trace_hdr.afilf = swapDataToShort ( trace_hdr.afilf ) ;

 trace_hdr.afils = swapDataToShort ( trace_hdr.afils ) ;

 trace_hdr.nofilf = swapDataToShort ( trace_hdr.nofilf ) ;

 trace_hdr.nofils = swapDataToShort ( trace_hdr.nofils ) ;

 trace_hdr.lcf = swapDataToShort ( trace_hdr.lcf ) ;

 trace_hdr.hcf = swapDataToShort ( trace_hdr.hcf ) ;

 trace_hdr.lcs = swapDataToShort ( trace_hdr.lcs ) ;

 trace_hdr.hcs = swapDataToShort ( trace_hdr.hcs ) ;

 trace_hdr.year = swapDataToShort ( trace_hdr.year ) ;

 trace_hdr.day = swapDataToShort ( trace_hdr.day ) ;

 trace_hdr.hour = swapDataToShort ( trace_hdr.hour ) ;

 trace_hdr.minute = swapDataToShort ( trace_hdr.minute ) ;

 trace_hdr.sec = swapDataToShort ( trace_hdr.sec ) ;

 trace_hdr.timbas = swapDataToShort ( trace_hdr.timbas ) ;

 trace_hdr.trwf = swapDataToShort ( trace_hdr.trwf ) ;

 trace_hdr.grnors = swapDataToShort ( trace_hdr.grnors ) ;

 trace_hdr.grnofr = swapDataToShort ( trace_hdr.grnofr ) ;

 trace_hdr.grnlof = swapDataToShort ( trace_hdr.grnlof ) ;

 trace_hdr.gaps = swapDataToShort ( trace_hdr.gaps ) ;

 trace_hdr.otrav = swapDataToShort ( trace_hdr.otrav ) ;

 for (int i = 0; i < 15; i    )

 {

 trace_hdr.user_define[i]=swapDataToLong(trace_hdr.user_define[i]);

 }

 }

 if(Input_SEGY_File.is_open())

 Input_SEGY_File.close();

}

//=========

void SEGY_RW::Read_TraceData(float * one_trace_data,int trace_id)

{

 if(trace_id<1||trace_id>TraceNumber) {cout<<"Your trace number is too small or large!"<<endl; exit(1);}

 //Calculate the position of current trace in the SEGY file

 Q_INT64 pos = (Q_INT64)3840   ((Q_INT64)trace_id - (Q_INT64)1) * ((Q_INT64)240   (Q_INT64)Sample_Number * sizeof(float));

 Input_SEGY_File.open(Input_SEGY_File_Name.c_str(),ios_base::in| ios::binary);

 Input_SEGY_File.seekg(pos);

 //fseek( pFileName,pos, SEEK_SET );

 //if(ftell(pFileName)>=address_file_end){cout<<"exceed the trace range: TraceData!"<<endl;};

 //cout<<"telltracedata: "<<pos<<endl;

 //Read Trace Data

 for (int i = 0; i <Sample_Number; i   )

 {

 //fread((char *) &trace_data[i], sizeof(float),1,pFileName);

 Input_SEGY_File.read((char *) &trace_data[i], sizeof(float));

 one_trace_data[i]=trace_data[i];

 if(m_iOSFormat==UNIX_FORMAT){

 IBM2IEEE(&one_trace_data[i],1);};

 }

 Input_SEGY_File.close();

}

 void SEGY_RW::Read_TraceData(VVD &data)

 {

 data.resize(TraceNumber);//

 Input_SEGY_File.open(Input_SEGY_File_Name.c_str(),ios_base::in| ios::binary);

 for(int trace_id=0;trace_id<TraceNumber;  trace_id){

 data[trace_id].resize(Sample_Number);

 //Calculate the position of current trace in the SEGY file

 Q_INT64 pos = (Q_INT64)3840   ((Q_INT64)trace_id /*- (Q_INT64)1*/) * ((Q_INT64)240   (Q_INT64)Sample_Number * sizeof(float));

 Input_SEGY_File.seekg(pos);

 //Read Trace Data

 for (int i = 0; i <Sample_Number; i   )

 {

 Input_SEGY_File.read((char *) &trace_data[i], sizeof(float));

 if(m_iOSFormat==UNIX_FORMAT)

 IBM2IEEE(&trace_data[i],1);

 data[trace_id][i]=static_cast<double>(trace_data[i]);

 //if(m_iOSFormat==UNIX_FORMAT){

 //IBM2IEEE(&one_trace_data[i],1);};

 }

 }

 Input_SEGY_File.close();

 }

//=========

void SEGY_RW::Write_TraceHeader()

{

 Output_SEGY_File.open(Output_SEGY_File_Name.c_str(), ios::out |ios::binary|ios::app);

 //Write the trace header value of every trace

 Output_SEGY_File.write((char *) &trace_hdr.trace_sequence_number_within_line, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.trace_sequence_number_within_reel, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.original_field_record_number, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.trace_sequence_number_within_original_field_record, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.energy_source_point_number, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.cdp_ensemble_number, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.trace_sequence_number_within_cdp_ensemble, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.trace_identification_code, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.number_of_vertically_summed_traces_yielding_this_trace, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.number_of_horizontally_stacked_traced_yielding_this_trace, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.data_use, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.distance_from_source_point_to_receiver_group, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.receiver_group_elevation, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.surface_elevation_at_source, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.source_depth_below_surface, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.datum_elevation_at_receiver_group, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.datum_elevation_at_source, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.water_depth_at_source, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.water_depth_at_receiver_group, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.scalar_for_elevations_and_depths, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.scalar_for_coordinates, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.x_source_coordinate, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.y_source_coordinate, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.x_receiver_group_coordinate, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.y_receiver_group_coordinate, sizeof(Q_INT32));

 Output_SEGY_File.write((char *) &trace_hdr.coordinate_units, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.weathering_velocity, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.subweathering_velocity, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.uphole_time_at_source, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.uphole_time_at_group, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.source_static_correction, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.group_static_correction, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.total_static_applied, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.lag_time_a, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.lag_time_b, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.delay_according_time, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.mute_time_start, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.mute_time_end, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.samples_in_this_trace, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.sample_intervall, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.gain_type_instruments, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.igc, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.igi, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.corr, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.sfs, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.sfe, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.slen, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.styp, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.stas, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.stae, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.tatyp, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.afilf, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.afils, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.nofilf, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.nofils, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.lcf, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.hcf, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.lcs, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.hcs, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.year, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.day, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.hour, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.minute, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.sec, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.timbas, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.trwf, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.grnors, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.grnofr, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.grnlof, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.gaps, sizeof(Q_INT16));

 Output_SEGY_File.write((char *) &trace_hdr.otrav, sizeof(Q_INT16));

 for (int i = 0; i < 15; i    )

 {

 Output_SEGY_File.write((char *) & trace_hdr.user_define[i], sizeof(Q_INT32));

 }

 //

 Output_SEGY_File.close();

}

//=========

void SEGY_RW::Write_TraceData(const float * one_trace_data)

{

 Output_SEGY_File.open(Output_SEGY_File_Name.c_str(), ios::out|ios::binary|ios::app);

 for (int i = 0; i <Sample_Number; i   )

 {

 Output_SEGY_File.write((char *) & one_trace_data[i], sizeof(float));

 }

 Output_SEGY_File.close();

}

//=========

short SEGY_RW::Return_SampleNumber()

{

 return volumn_hdr.samples_per_trace;

}

//=========

short SEGY_RW::Return_SampleInterval()

{

 return volumn_hdr.sample_data_interval_ms;

}

//=========

int SEGY_RW::Return_TraceNumber()

{

 return TraceNumber;

}

//=========

int SEGY_RW::Return_CMP()

{

 return trace_hdr.cdp_ensemble_number;

}

//=========

int SEGY_RW::Return_Trace_Id_Of_CMP()

{

 return trace_hdr.trace_sequence_number_within_cdp_ensemble;

}

int SEGY_RW::Return_Trace()

{

 return trace_hdr. trace_sequence_number_within_reel;

}

int SEGY_RW::Return_ShotNum()

{

 return trace_hdr.energy_source_point_number;

}

int SEGY_RW::Return_Trace_Id_Of_Shot()

{

 return trace_hdr.trace_sequence_number_within_original_field_record;

}

int SEGY_RW::Return_Sampling_Format_Code()

{

 return volumn_hdr.data_sample_format_code;

}

//IBM VS. IEEE

long SEGY_RW::swapDataToLong(long x)

{

 Q_INT8* cbuf;

 Q_INT8 tem;

 cbuf = (Q_INT8*)&x; 

 tem = cbuf[0]; cbuf[0] = cbuf[3]; cbuf[3] = tem;

 tem = cbuf[2]; cbuf[2] = cbuf[1]; cbuf[1] = tem;

 return x;

}

short SEGY_RW::swapDataToShort(short x)

{

 Q_INT8* cbuf;

 Q_INT8 tem;

 cbuf=(Q_INT8*)&x; 

 tem = cbuf[0]; cbuf[0] = cbuf[1]; cbuf[1] = tem;

 return x;

}

void SEGY_RW::IBM2IEEE(float* data, bool swap)

{

 unsigned char *cbuf,expp,tem,sign;

 unsigned long *umantis,expll;

 long *mantis;

 int shift;

 cbuf = (unsigned char*)&data[0]; //

 umantis = (unsigned long*)&data[0]; //

 mantis = (long*)&data[0];

 if(swap)

 {

 tem = cbuf[0]; cbuf[0] = cbuf[3]; cbuf[3] = tem;

 tem = cbuf[2]; cbuf[2] = cbuf[1]; cbuf[1] = tem;

 }

 expp = (unsigned char)(*mantis >> 24);

 *mantis = (*mantis) << 8;

 shift = 1;

 while(*mantis > 0 && shift < 23)

 {

 *mantis = *mantis << 1;

 shift  ;

 }

 *mantis = *mantis<<1;

 sign = expp & 0x80;

 expp = expp & 0x7F;

 if(expp != 0)

 {

 expp = expp-64;

 *umantis = *umantis>>9;

 expll = 0x7F   (expp*4 - shift);

 expll = expll << 23;

 if(sign) *umantis = expll | *mantis | 0x80000000;

 else *umantis = expll | *mantis;

 }

}

/*

 1 = 32-bit IBM floating point

 2 = 32-bit fixed-point (integer)

 3 = 16-bit fixed-point (integer)

 4 = 32-bit fixed-point with gain code (integer)

 5 = 32-bit IEEE floating point

 6 = NOT CURRENTLY USERD

 7 = NOT CURRENTLY USERD

 8 = 8-bit(integer)

*/

//=========

//////////////////////////////////////////////////////////////////////////

void SEGY_RW::Read_TraceHeader_IBM(int trace_id)

{

 if(trace_id<1||trace_id>TraceNumber) {cout<<"Your trace number is too small or large!"<<endl; exit(1);}

 //here we must use Q_INT64 instead of int ,because of the support to large file .

 Q_INT64 pos = (Q_INT64)3600   ( (Q_INT64)trace_id - (Q_INT64)1) * ( (Q_INT64)240   (Q_INT64)Sample_Number * sizeof(float));//

 Input_SEGY_File.open(Input_SEGY_File_Name.c_str(),ios_base::in| ios::binary);

 Input_SEGY_File.seekg(pos);//

 // fseek( pFileName,pos, SEEK_SET );

 // if(ftell(pFileName)>=address_file_end){cout<<"exceed the trace range: TraceHeader!"<<endl;};

 //cout<<"telltracehdrdata: "<<_ftelli64(pFileName)<<endl<<"address "<<address_file_end<<endl<<"Tracehdrpos: "<<pos<<endl;

 //Read Trace Header

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_line, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_reel, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.original_field_record_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_original_field_record, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.energy_source_point_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.cdp_ensemble_number, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_sequence_number_within_cdp_ensemble, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.trace_identification_code, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.number_of_vertically_summed_traces_yielding_this_trace, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.number_of_horizontally_stacked_traced_yielding_this_trace, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.data_use, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.distance_from_source_point_to_receiver_group, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.receiver_group_elevation, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.surface_elevation_at_source, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.source_depth_below_surface, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.datum_elevation_at_receiver_group, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.datum_elevation_at_source, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.water_depth_at_source, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.water_depth_at_receiver_group, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.scalar_for_elevations_and_depths, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.scalar_for_coordinates, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.x_source_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.y_source_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.x_receiver_group_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.y_receiver_group_coordinate, sizeof(Q_INT32));

 Input_SEGY_File.read((char *) &trace_hdr.coordinate_units, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.weathering_velocity, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.subweathering_velocity, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.uphole_time_at_source, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.uphole_time_at_group, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.source_static_correction, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.group_static_correction, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.total_static_applied, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lag_time_a, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lag_time_b, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.delay_according_time, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.mute_time_start, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.mute_time_end, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.samples_in_this_trace, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sample_intervall, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.gain_type_instruments, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.igc, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.igi, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.corr, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sfs, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sfe, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.slen, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.styp, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.stas, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.stae, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.tatyp, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.afilf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.afils, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.nofilf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.nofils, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lcf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.hcf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.lcs, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.hcs, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.year, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.day, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.hour, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.minute, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.sec, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.timbas, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.trwf, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.grnors, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.grnofr, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.grnlof, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.gaps, sizeof(Q_INT16));

 Input_SEGY_File.read((char *) &trace_hdr.otrav, sizeof(Q_INT16));

 for (int i = 0; i < 15; i    )

 {

 Input_SEGY_File.read((char *) & trace_hdr.user_define[i], sizeof(Q_INT32));

 }

 if(Input_SEGY_File.is_open())

 Input_SEGY_File.close();

}

void SEGY_RW::Write_TraceData_IBM(float *one_trace_data)

{

 for(int i = 0; i <Sample_Number; i   )

 {

 IEEE2IBM(&one_trace_data[i]);

 }

 Output_SEGY_File.open(Output_SEGY_File_Name.c_str(), ios::out|ios::binary|ios::app);

 for (int i = 0; i <Sample_Number; i   )

 {

 Output_SEGY_File.write((char *) & one_trace_data[i], sizeof(float));

 }

 Output_SEGY_File.close();

}

void SEGY_RW::IEEE2IBM(float *data)

{

 char *from;

 char *to;

 unsigned fconv, fsign, fexpn;

 register unsigned fmant;

 register int t;

 register char *bp = (char *) &fconv;

 from=(char*)&data[0];

 to=(char*)&data[0];

 bp[0] = from[0];

 bp[1] = from[1];

 bp[2] = from[2];

 bp[3] = from[3];

 from  = 4;

 fsign = (unsigned) 0x80000000 & fconv;

 fexpn = (unsigned) 0x7f800000 & fconv;

 fmant = ((unsigned) 0x007fffff & fconv) |

 (unsigned) 0x00800000; /* add 1 at 9-th bit */

if (!fexpn) fconv = 0;

else {

 t = (int) (fexpn >> 23) - 127   1;

 while (t & 0x7) {

   t;

 fmant >>= 1;

 }

 fexpn = (unsigned) ((t>>2)   64) << 24;

 fconv = fsign | fexpn | fmant;

 }

 *to   = bp[0];

 *to   = bp[1];

 *to   = bp[2];

 *to   = bp[3];

}