00001 /* Copyright (c) Colorado School of Mines, 2006.*/ 00002 /* All rights reserved. */ 00003 00004 /*----------------------------------------------------------------------- 00005 * segd.h - include file for SEGD traces 00006 * Version 2.1, 10/10/94, Marc Schaming 00007 * Version 2.2, 17/08/95, Celine Girard et Marc Schaming 00008 * Version 2.3, 04/1997, Marc Schaming 00009 * Version 2.4, 02/1998, Stewart A. Levin (SEP) 00010 * changed general_header_1.f to unsigned char[2] 00011 * changed non-struct typedefs to struct typedefs 00012 * to allow for uniform future expansion 00013 * Version 2.5, 02/2001, Stewart A. Levin (SEP) 00014 * Little endian fixups for channel_set_header.cs 00015 * and dem_trace_header,tn 00016 * 00017 00018 * declarations for: 00019 * typedef struct {} general_header_1 : general header 00020 * typedef struct {} general_header_2 : general header 00021 * typedef struct {} general_header_n : general header 00022 * typedef struct {} gen_head_sn358 : general header for sn358 00023 * typedef struct {} channel_set_header : channel set descriptor 00024 * typedef struct {} sample_skew : sample skew block 00025 * typedef struct {} extended_header : extended header 00026 * typedef struct {} external_header : external header 00027 * typedef struct {} general_trailer : general trailer 00028 00029 * typedef struct {} dem_trace_header : demultiplexed trace header 00030 * typedef struct {} trace_header_ext : trace header extension 00031 * typedef struct {} general_trailer : general trailer 00032 * 00033 * 00034 * Reference: 00035 * SEG Subcommitee on Digital Tape Formats, "Digital field 00036 * tape format standards - SEG-D" 00037 * Digital field tape format standards - SEG-D, REVISION 1 (1994) 00038 * Geophysics, vol. 59, p.668-684 00039 * 00040 *---------------------------------------------------------------------*/ 00041 00042 /*---------------- General header block #1 -------------------------*/ 00043 00044 typedef struct { 00045 unsigned char f[2]; /* 01-02 File number (0-9999) */ 00046 unsigned short y; /* 03-04 Format code */ 00047 char k1_k2; /* 05 General constants */ 00048 char k3_k4; /* 06 General constants */ 00049 char k5_k6; /* 07 General constants */ 00050 char k7_k8; /* 08 General constants */ 00051 char k9_k10; /* 09 General constants */ 00052 char k11_k12; /* 10 General constants */ 00053 unsigned char yr; /* 11 Year (0-99) */ 00054 unsigned char gh_dy1; /* 12 Number blocks in general header */ 00055 /* 12 - day of year (x--) */ 00056 unsigned char dy; /* 13 Day of year (xx) */ 00057 unsigned char h; /* 14 Hour of day */ 00058 unsigned char mi; /* 15 Minute of hour */ 00059 unsigned char se; /* 16 Second of minute */ 00060 unsigned char m[3]; /* 17 Manufacturer's code */ 00061 /* 18-19 and serial number */ 00062 unsigned char b[3]; /* 20-22 Bytes per scan (multiplexed only) */ 00063 unsigned char i; /* 23 Base scan interval */ 00064 unsigned char p_sbx; /* 24 Polarity */ 00065 /* 24 - Number of scans per block */ 00066 unsigned char sb; /* 25 Number of scans per block */ 00067 unsigned char z_r1; /* 26 Record type */ 00068 /* 26 - Record length */ 00069 unsigned char r; /* 27 Record length */ 00070 unsigned char str; /* 28 Scan types per record */ 00071 unsigned char cs; /* 29 Channels sets per scan type */ 00072 unsigned char sk; /* 30 Skew blocks */ 00073 unsigned char ec; /* 31 Extended header length */ 00074 unsigned char ex; /* 32 External header length */ 00075 } general_header_1; 00076 00077 00078 /*---------------- General header block #2 -------------------------*/ 00079 00080 typedef struct { 00081 unsigned char ef[3]; /* 01-03 Extended file number */ 00082 unsigned char en[2]; /* 04-05 Extended channel sets and scan types */ 00083 unsigned char ecx[2]; /* 06-07 Extended header blocks */ 00084 unsigned char eh[2]; /* 08-09 external header blocks */ 00085 char x1; /* 10 undefined */ 00086 unsigned char rev[2]; /* 11-12 SEG-D revision number */ 00087 unsigned short gt; /* 13-14 General trailer number */ 00088 unsigned char erl[3]; /* 15-17 Extended record length */ 00089 char x2; /* 18 undefined */ 00090 unsigned char bn; /* 19 General header block number */ 00091 char x3[13]; /* 20-32 undefined */ 00092 } general_header_2; 00093 00094 00095 /*---------------- General header block #n -------------------------*/ 00096 00097 typedef struct { 00098 char x1[3]; /* 01-03 undefined */ 00099 unsigned char sln[5]; /* 04-08 Source line number */ 00100 unsigned char spn[5]; /* 09-13 Source point number */ 00101 unsigned char spi; /* 14 Source point index */ 00102 unsigned char pc; /* 15 Phase control */ 00103 unsigned char v; /* 16 Type vibrator */ 00104 short pa; /* 17-18 Phase angle */ 00105 unsigned char bn; /* 19 General header block number */ 00106 unsigned char ss; /* 20 Source set number */ 00107 char x2[12]; /* 21-32 undefined */ 00108 } general_header_n; 00109 00110 00111 /*---------------- General header extension (Sercel SN358) ---------*/ 00112 00113 typedef struct { 00114 unsigned char fc1; /* 01 first and last channel of seismic param 1 */ 00115 unsigned char lc1; /* 01-02 last channel of seismic param 1 */ 00116 unsigned char fc2; /* 03-04 first channel of seismic param 2 */ 00117 unsigned char f_lc2; /* 03-04 first and last channel of seismic param 2 */ 00118 unsigned char lc2; /* 04-05 last channel of seismic param 2 */ 00119 unsigned char fc3; /* 06-07 first channel of seismic param 3 */ 00120 unsigned char f_lc3; /* 07 fist and last channel of seismic param 3 */ 00121 unsigned char lc3; /* 07-08 last channel of seismic param 3 */ 00122 unsigned char fc4; /* 09-10 first channel of seismic param 4 */ 00123 unsigned char f_lc4; /* 10 first and last channel of seismic param 4 */ 00124 unsigned char lc4; /* 10-11 fist channel of seismic param 4 */ 00125 unsigned char f_lac1; /* 12 first and last aux channel of scan type 1 */ 00126 unsigned char fsc1; /* 13-14 first seismic channel of scan type 1 */ 00127 unsigned char f_lsc1; /* 14 first and last seismic channel of scan type 1 */ 00128 unsigned char lsc1; /* 14-15 last seismic channel of scan type 1 */ 00129 unsigned char sam_int1;/* 16 sample interval of scan type 1 */ 00130 unsigned char fac2; /* 17 first and last aux channel of scan type 2 */ 00131 unsigned char fsc2; /* 18-19 first seismic channel of scan type 2 */ 00132 unsigned char f_lsc2; /* 19 first and last seismic channel of scan type 2 */ 00133 unsigned char lsc2; /* 19-20 last seismic channel of scan type 2 */ 00134 unsigned char sam_int2;/* 21 sample interval of scan type 2 */ 00135 unsigned char bl_sig_le;/* 22 block signature length (n*0.1 s) */ 00136 unsigned char rec_length[2]; /* 23-24 record length n*0.1 s (00.0-99.9) s */ 00137 unsigned char dyn_swit_del[2]; /* 25-26 dynamically switching delay (00.0-99.9 s) */ 00138 unsigned char rec_del[2]; /* 27-28 recording delay (00.0-99.9s) */ 00139 unsigned char ty_a_cha12;/* 29 type of auxiliary channel 1, channel 2 */ 00140 unsigned char ty_a_cha34;/* 30 type of auxiliary channel 3, channel 4 */ 00141 unsigned char ty_a_cha56;/* 31 type of auxiliary channel 5, channel 6 */ 00142 unsigned char ty_a_cha78;/* 32 type of auxiliary channel 7, channel 8 */ 00143 unsigned char mode_num;/* 33 mode number */ 00144 unsigned char an_sys_co;/* 34 analog sys count (1-2), tape transport num */ 00145 unsigned char reel_num[2]; /* 35-36 reel number (0-9999) */ 00146 unsigned char file_num[2]; /* 37-38 file logical number */ 00147 unsigned char sp_num[2]; /* 39-40 shot point number */ 00148 unsigned char lc_nf; /* 41 lc=0 lowcut fi. out, nf=0 notch fi. out */ 00149 unsigned char fg_ic; /* 42 fg=1 fist fixed gain, ic=1 internal osc. */ 00150 unsigned char of1; /* 43-45 oscillator frequency (0-9999.9 Hz) */ 00151 unsigned char of2; /* 43-45 oscillator frequency (0-9999.9 Hz) */ 00152 unsigned char of3; /* 43-45 oscillator frequency (0-9999.9 Hz) */ 00153 unsigned char osc_att;/* 46 oscillator attenuator */ 00154 unsigned char t_sig_ph;/* 47 test signal phase (1:+,0:-) */ 00155 unsigned char m_gain; /* 48 main gain amplifier (0-15) 16: IFP */ 00156 unsigned char dum[16];/* 49-64 additional information */ 00157 } gen_head_sn358; 00158 00159 00160 /*---------------- Scan type header (Channel set descriptor ) ------*/ 00161 00162 typedef struct { 00163 unsigned char st; /* 01 Scan type */ 00164 unsigned char cn; /* 02 Channel set number */ 00165 unsigned short tf; /* 03-04 Channel set start time */ 00166 unsigned short te; /* 05-06 Channel set end time */ 00167 unsigned char mp[2]; /* 07-08 Descaling exponent */ 00168 unsigned char cs[2]; /* 09-10 Channels in this channel set */ 00169 unsigned char c; /* 11 Channel type identification */ 00170 unsigned char sc_j; /* 12 Sample/channel gain */ 00171 /* 12 - Gain control method */ 00172 unsigned short af; /* 13-14 Alias filter frequency */ 00173 unsigned short as; /* 15-16 Alias filter slope */ 00174 unsigned short lc; /* 17-18 Low cut filter frequency */ 00175 unsigned short ls; /* 19-20 Low cut filter slope */ 00176 unsigned short nt[3]; /* 21-26 Notch filter frequency */ 00177 unsigned short ecs; /* 27-28 Extended channel set number */ 00178 unsigned char efh; /* 29 Extended header flag */ 00179 unsigned char vs; /* 30 Vertical stack */ 00180 unsigned char cab; /* 31 Streamer number */ 00181 unsigned char ary; /* 32 Array forming */ 00182 } channel_set_header; 00183 00184 00185 /*---------------- Sample skew -------------------------------------*/ 00186 00187 typedef struct { 00188 unsigned char skew[32]; 00189 } sample_skew; 00190 00191 00192 /*---------------- Extended header ---------------------------------*/ 00193 00194 typedef struct { 00195 unsigned char dummy[32]; 00196 } extended_header; 00197 00198 00199 /*---------------- External header ---------------------------------*/ 00200 00201 typedef struct { 00202 unsigned char dummy[32]; 00203 } external_header; 00204 00205 00206 /*---------------- General trailer ---------------------------------*/ 00207 00208 typedef struct { 00209 unsigned short gt; /* 01-02 General trailer number */ 00210 char x1[8]; /* 03-10 undefined */ 00211 unsigned char c; /* 11 Channel type identification */ 00212 char x2[21]; /* 12-32 undefined */ 00213 } general_trailer; 00214 00215 00216 /*--------------- Demultiplexed trace header -----------------------*/ 00217 00218 typedef struct { 00219 unsigned short f; /* 01-02 file number */ 00220 unsigned char st; /* 03 scan type (1-2) */ 00221 unsigned char cn; /* 04 channel set */ 00222 unsigned char tn[2]; /* 05-06 trace number */ 00223 unsigned char t[3]; /* 07-09 timing word of the first sample if 00224 the data were written in the multiplexed 00225 format */ 00226 unsigned char the; /* 10 trace header extensions */ 00227 unsigned char ss; /* 11 sample skew of the first sample 00228 of the trace. It is a part of 00229 the fractional part of the base scan interval. Res : 00230 1/256 scan interval */ 00231 unsigned char tr; /* 12 trace edit */ 00232 unsigned char tw[3]; /* 13-15 time from time break to the end of 00233 the internal time break window (binary 00234 number, inc 1ms) */ 00235 unsigned char en[2]; /* 16-17 extended channel set number */ 00236 unsigned char efn[3]; /* 18-20 extended file number */ 00237 } dem_trace_header; 00238 00239 00240 /*---------------- Trace header extension --------------------------*/ 00241 00242 typedef struct { 00243 unsigned char rln[3]; /* 01-03 Receiver line number */ 00244 unsigned char rpn[3]; /* 04-06 Receiver point number */ 00245 unsigned char rpi; /* 07 Receiver point index */ 00246 unsigned char nbs[3]; /* 08-10 Number of samples per traces */ 00247 char x[22]; /* 11-32 undefined */ 00248 } trace_header_ext;
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