/* Extended Module Player
 * Copyright (C) 1996-1999 Claudio Matsuoka and Hipolito Carraro Jr
 *
 * This file is part of the Extended Module Player and is distributed
 * under the terms of the GNU General Public License. See doc/COPYING
 * for more information.
 */


/* S3M packed pattern macros */
#define S3M_EOR		0	/* End of row */
#define S3M_CH_MASK	0x1f	/* Channel */
#define S3M_NI_FOLLOW	0x20	/* Note and instrument follow */
#define S3M_VOL_FOLLOWS	0x40	/* Volume follows */
#define S3M_FX_FOLLOWS	0x80	/* Effect and parameter follow */

/* S3M channel info macros */
#define S3M_CH_ON	0x80	/* Psi says it's bit 8, I'll assume bit 7 */
#define S3M_CH_OFF	0xff
#define S3M_CH_PAN	0x7f	/* Left/Right */

/* S3M channel pan macros */
#define S3M_PAN_SET	0x20
#define S3M_PAN_MASK	0x0f

/* S3M flags */
#define S3M_ST2_VIB	0x01	/* Not recognized */
#define S3M_ST2_TEMPO	0x02	/* Not recognized */
#define S3M_AMIGA_SLIDE	0x04	/* Not recognized */
#define S3M_VOL_OPT	0x08	/* Not recognized */
#define S3M_AMIGA_RANGE	0x10
#define S3M_SB_FILTER	0x20	/* Not recognized */
#define S3M_ST300_VOLS	0x40
#define S3M_CUSTOM_DATA	0x80	/* Not recognized */

/* S3M Adlib instrument types */
#define S3M_INST_SAMPLE	0x01
#define S3M_INST_AMEL	0x02
#define S3M_INST_ABD	0x03
#define S3M_INST_ASNARE	0x04
#define S3M_INST_ATOM	0x05
#define S3M_INST_ACYM	0x06
#define S3M_INST_AHIHAT	0x07

struct s3m_file_header {
    uint8 name[28];		/* Song name */
    uint8 doseof;		/* 0x1a */
    uint8 type;			/* File type */
    uint8 rsvd1[2];		/* Reserved */
    uint16 ordnum;		/* Number of orders (must be even) */
    uint16 insnum;		/* Number of instruments */
    uint16 patnum;		/* Number of patterns */
    uint16 flags;		/* Flags */
    uint16 version;		/* Tracker ID and version */
    uint16 ffi;			/* File format information */
    uint8 magic[4];		/* 'SCRM' */
    uint8 gv;			/* Global volume */
    uint8 is;			/* Initial speed */
    uint8 it;			/* Initial tempo */
    uint8 mv;			/* Master volume */
    uint8 uc;			/* Ultra click removal */
    uint8 dp;			/* Default pan positions if 0xfc */
    uint8 rsvd2[8];		/* Reserved */
    uint16 special;		/* Ptr to special custom data */
    uint8 chset[32];		/* Channel settings */
} PACKED;

struct s3m_instrument_header {
    uint8 dosname[13];		/* DOS file name */
    uint16 memseg;		/* Pointer to sample data */
    uint32 length;		/* Length */
    uint32 loopbeg;		/* Loop begin */
    uint32 loopend;		/* Loop end */
    uint8 vol;			/* Volume */
    uint8 rsvd1;		/* Reserved */
    uint8 pack;			/* Packing type (not used) */
    uint8 flags;		/* Loop/stereo/16bit samples flags */
    uint16 c2spd;		/* C 4 speed */
    uint16 rsvd2;		/* Reserved */
    uint8 rsvd3[4];		/* Reserved */
    uint16 int_gp;		/* Internal - GUS pointer */
    uint16 int_512;		/* Internal - SB pointer */
    uint32 int_last;		/* Internal - SB index */
    uint8 name[28];		/* Instrument name */
    uint8 magic[4];		/* 'SCRS' */
} PACKED;

struct s3m_adlib_header {
    uint8 dosname[12];		/* DOS file name */
    uint8 rsvd1[3];		/* 0x00 0x00 0x00 */
    uint8 reg[12];		/* Adlib registers */
    uint8 vol;
    uint8 dsk;
    uint8 rsvd2[2];
    uint16 c2spd;		/* C 4 speed */
    uint16 rsvd3;		/* Reserved */
    uint8 rsvd4[12];		/* Reserved */
    uint8 name[28];		/* Instrument name */
    uint8 magic[4];		/* 'SCRI' */
} PACKED;