/* 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.
 */

#define IMF_EOR		0x00
#define IMF_CH_MASK	0x1f
#define IMF_NI_FOLLOW	0x20
#define IMF_FX_FOLLOWS	0x80
#define IMF_F2_FOLLOWS	0x40

struct imf_channel {
    char name[12];		/* Channelname (ASCIIZ-String, max. 11 chars) */
    uint8 status;		/* Channel status */
    uint8 pan;			/* Pan positions */
    uint8 chorus;		/* Default chorus */
    uint8 reverb;		/* Default reverb */
} PACKED;

struct imf_header {
    char name[32];		/* Songname (ASCIIZ-String, max. 31 chars) */
    uint16 len;			/* Number of orders saved */
    uint16 pat;			/* Number of patterns saved */
    uint16 ins;			/* Number of instruments saved */
    uint16 flg;			/* Module flags */
    uint8 unused1[8];
    uint8 tpo;			/* Default tempo (1..255) */
    uint8 bpm;			/* Default beats per minute (BPM) (32..255) */
    uint8 vol;			/* Default mastervolume (0..64) */
    uint8 amp;			/* Amplification factor (4..127) */
    uint8 unsused2[8];
    uint8 magic[4];		/* 'IM10' */
    struct imf_channel chn[32];	/* Channel settings */
    uint8 pos[256];		/* Order list */
} PACKED;

struct imf_env {
    uint8 npt;			/* Number of envelope points */
    uint8 sus;			/* Envelope sustain point */
    uint8 lps;			/* Envelope loop start point */
    uint8 lpe;			/* Envelope loop end point */
    uint8 flg;			/* Envelope flags */
    uint8 unused[3];
} PACKED;

struct imf_instrument {
    char name[32];		/* Inst. name (ASCIIZ-String, max. 31 chars) */
    uint8 map[120];		/* Multisample settings */
    uint8 unused[8];
    uint16 vol_env[32];		/* Volume envelope settings */
    uint16 pan_env[32];		/* Pan envelope settings */
    uint16 pitch_env[32];	/* Pitch envelope settings */
    struct imf_env env[3];
    uint16 fadeout;		/* Fadeout rate (0...0FFFH) */
    uint16 nsm;			/* Number of samples in instrument */
    uint8 magic[4];		/* 'II10' */
} PACKED;

struct imf_sample {
    char name[13];		/* Sample filename (12345678.ABC) */
    uint8 unused1[3];
    uint32 len;			/* Length */
    uint32 lps;			/* Loop start */
    uint32 lpe;			/* Loop end */
    uint32 rate;		/* Samplerate */
    uint8 vol;			/* Default volume (0..64) */
    uint8 pan;			/* Default pan (00h = Left / 80h = Middle) */
    uint8 unused2[14];
    uint8 flg;			/* Sample flags */
    uint8 unused3[5];
    uint16 ems;			/* Reserved for internal usage */
    uint32 dram;		/* Reserved for internal usage */
    uint8 magic[4];		/* 'IS10' */
} PACKED;