segy.h

/* Copyright (c) Colorado School of Mines, 2011.*/
/* All rights reserved.                       */

/* segy.h - include file for SEGY traces
 *
 * declarations for:
 *	typedef struct {} segy - the trace identification header
 *	typedef struct {} bhed - binary header
 *
 * Note:
 *	If header words are added, run the makefile in this directory
 *	to recreate hdr.h.
 *
 * Reference:
 *	K. M. Barry, D. A. Cavers and C. W. Kneale, "Special Report:
 *		Recommended Standards for Digital Tape Formats",
 *		Geophysics, vol. 40, no. 2 (April 1975), P. 344-352.
 *	
 * $Author: john $
 * $Source: /usr/local/cwp/src/su/include/RCS/segy.h,v $
 * $Revision: 1.33 $ ; $Date: 2011/11/11 23:56:14 $
 */ 

#include <limits.h>
#include "par.h"

#ifndef SEGY_H
#define SEGY_H
#define TRCBYTES		240

#define SU_NFLTS	32767	/* Arbitrary limit on data array size	*/


/* TYPEDEFS */
typedef struct {	/* segy - trace identification header */

	int tracl;	/* Trace sequence number within line
			   --numbers continue to increase if the
			   same line continues across multiple
			   SEG Y files.
			   byte# 1-4
			 */

	int tracr;	/* Trace sequence number within SEG Y file
			   ---each file starts with trace sequence
			   one
			   byte# 5-8
			 */

	int fldr;	/* Original field record number
			   byte# 9-12 
			*/

	int tracf;	/* Trace number within original field record 
			   byte# 13-16
			*/

	int ep;		/* energy source point number
			   ---Used when more than one record occurs
			   at the same effective surface location.
			   byte# 17-20
			 */

	int cdp;	/* Ensemble number (i.e. CDP, CMP, CRP,...) 
			   byte# 21-24
			*/

	int cdpt;	/* trace number within the ensemble
			   ---each ensemble starts with trace number one.
			   byte# 25-28