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STC.a80
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STC.a80
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; Sound Tracker 1.x compiled song player © 1990 Bzyk/Pentagram
; refactored, optimized and improved by © 2020 mborik/SinDiKat
device zxspectrum128
@HEADLEN = 27 ; file header length
@SAMPLEN = 99 ; single sample length
@ORNALEN = 33 ; single ornament length
@PATTLEN = 7 ; single pattern record length
@NULL = 0
ifndef PUREPLAYER
org #8000
demo di
ld sp,demo
call music_init
demo.loop ei
halt
call music_play
jr demo.loop
endif
ifndef SINGLESETUP
; bit.0 if you want to play without looping
; bit.1 if you play looped but fadeout after few seconds
; bit.7 is set each time when loop or fadeout was passed
; ...or simplified: 2 - fadeout after loop
; 1 - no loop
; 0 - loop forever
music_setup: db 2
endif
;------------------------------------------------------------------------------
music_init: ld hl,songdata
music_init0: ld a,(hl)
ld (speed),a
ld (module_addr+1),hl
inc hl
call add_offset
ld a,(de)
inc de
inc a
ld (song_length),a
ld (positions),de
call add_offset
ld (ornaments),de
push de
call add_offset
ld (patterns),de
ld hl,HEADLEN
call module_addr
ex de,hl
ld (samples),hl
ld hl,empty_pattern
ld (chn1_pattptr),hl
inc hl
ld de,CHN1+1
ld bc,VARSLEN
ld (hl),b
ldir
pop hl
ld bc,ORNALEN
xor a
call scan_until
ld (apply_volenv+1),a
ld (chkfadeout+1),a
dec a
ld (CHN1+CHP.SmpCnt),a
ld (CHN2+CHP.SmpCnt),a
ld (CHN3+CHP.SmpCnt),a
ld a,1
ld (tempo_cnt),a
inc hl
ld (CHN1+CHP.OrnPtr),hl
ld (CHN2+CHP.OrnPtr),hl
ld (CHN3+CHP.OrnPtr),hl
ld hl,music_setup
res 7,(hl)
jp music_mute
scan_until: cp (hl)
ret z
add hl,bc
jr scan_until
add_offset: ld e,(hl)
inc hl
ld d,(hl)
inc hl
ex de,hl
module_addr: ld bc,NULL
add hl,bc
ex de,hl
ret
new_position: ld a,(current_pos)
ld c,a
ld hl,song_length
cp (hl)
jr c,.continue
ld hl,music_setup
bit 1,(hl)
call nz,enablefade
bit 0,(hl)
jp nz,noloop
xor a
ld c,a
.continue: inc a
ld (current_pos),a
ld l,c
ld h,0
add hl,hl
ld de,(positions)
add hl,de
ld c,(hl)
inc hl
ld a,(hl)
ld (get_frequency+1),a
ld a,c
ld hl,(patterns)
ld bc,PATTLEN
call scan_until
inc hl
call add_offset
ld (chn1_pattptr),de
call add_offset
ld (chn2_pattptr),de
call add_offset
ld (chn3_pattptr),de
ret
adv_patt_step: dec (ix+CHP.PatStpCnt)
ret p
ld a,(ix+CHP.PatStep)
ld (ix+CHP.PatStpCnt),a
ret
;------------------------------------------------------------------------------
music_play: ld a,(tempo_cnt)
dec a
ld (tempo_cnt),a
jr nz,playback
ld a,(speed)
ld (tempo_cnt),a
.chn1: ld ix,CHN1
call adv_patt_step
jp p,.chn2
ld hl,(chn1_pattptr)
ld a,(hl)
inc a
call z,new_position
ld hl,(chn1_pattptr)
call read_pattern
ld (chn1_pattptr),hl
.chn2: ld ix,CHN2
call adv_patt_step
jp p,.chn3
ld hl,(chn2_pattptr)
call read_pattern
ld (chn2_pattptr),hl
.chn3: ld ix,CHN3
call adv_patt_step
jp p,playback
ld hl,(chn3_pattptr)
call read_pattern
ld (chn3_pattptr),hl
;------------------------------------------------------------------------------
playback: call chkfadeout
ld ix,CHN1
call adv_sample
ld a,c
ld (sample_index+1),a
call read_sample
ld a,c
or b
rrca
ld (AYREGS+AR.Mixer),a
ld a,(ix+CHP.SmpCnt)
inc a
jr z,.chn2
call set_noise
call get_tone
ld (AYREGS+AR.TonA),hl
.chn2: ld hl,AYREGS+AR.AmplA
call apply_volenv
ld ix,CHN2
call adv_sample
ld a,(ix+CHP.SmpCnt)
inc a
jr z,.chn3
ld a,c
ld (sample_index+1),a
call read_sample
ld a,(AYREGS+AR.Mixer)
or c
or b
ld (AYREGS+AR.Mixer),a
call set_noise
call get_tone
ld (AYREGS+AR.TonB),hl
.chn3: ld hl,AYREGS+AR.AmplB
call apply_volenv
ld ix,CHN3
call adv_sample
ld a,(ix+CHP.SmpCnt)
inc a
jr z,.finish
ld a,c
ld (sample_index+1),a
call read_sample
ld a,(AYREGS+AR.Mixer)
rlc c
rlc b
or b
or c
ld (AYREGS+AR.Mixer),a
call set_noise
call get_tone
ld (AYREGS+AR.TonC),hl
.finish: ld hl,AYREGS+AR.AmplC
call apply_volenv
outay: ld hl,AYREGS+AR.EnvSh
xor a
or (hl)
ld a,AR.EnvSh
jr nz,.fillregs
sub 3
dec hl
dec hl
dec hl
.fillregs: ld bc,#FFFD
.loop: out (c),a
res 6,b
outd
set 6,b
dec a
ret m
jr .loop
music_mute: ld hl,AYREGS
ld de,AYREGS+1
ld bc,AR.Mixer
ld (hl),b
ldir
dec (hl)
ld l,low AYREGS
ld c,AR.EnvSh-AR.Mixer-1
ldir
ex hl,de
ld a,AR.EnvSh
jr outay.fillregs
c_note: ld (ix+CHP.Note),a
ld (ix+CHP.SmpIndex),0
ld (ix+CHP.SmpCnt),#20
c_empty: inc hl
ret
c_sample: sub #60
push hl
ld bc,SAMPLEN
ld hl,(samples)
call scan_until
inc hl
ld (ix+CHP.SmpPtr),l
ld (ix+CHP.SmpPtr+1),h
pop hl
inc hl
jr read_pattern
c_rest: inc hl
c_norept: ld (ix+CHP.SmpCnt),-1
ret
read_pattern: ld a,(hl)
cp #60 ; note
jr c,c_note
cp #70 ; sample
jr c,c_sample
cp #80 ; ornament
jr c,c_ornament
jr z,c_rest ; rest
cp #81 ; empty
jr z,c_empty
cp #82 ; ornament off
jr z,c_ornoff
cp #8F ; envelope
jr c,c_envelope
sub #A1 ; speed
ld (ix+CHP.PatStpCnt),a
ld (ix+CHP.PatStep),a
inc hl
jr read_pattern
c_ornoff: xor a
db 1 ; ld bc,* (skip next instruction)
c_ornament: sub #70
c_ornament0: push hl
ld bc,ORNALEN
ld hl,(ornaments)
call scan_until
inc hl
ld (ix+CHP.OrnPtr),l
ld (ix+CHP.OrnPtr+1),h
ld (ix+CHP.EnvState),0
pop hl
inc hl
jr read_pattern
c_envelope: sub #80
ld (AYREGS+AR.EnvSh),a
inc hl
ld a,(hl)
inc hl
ld (AYREGS+AR.Env),a
ld (ix+CHP.EnvState),1
push hl
xor a
ld bc,ORNALEN
ld hl,(ornaments)
call scan_until
inc hl
ld (ix+CHP.OrnPtr),l
ld (ix+CHP.OrnPtr+1),h
pop hl
jr read_pattern
adv_sample: ld a,(ix+CHP.SmpCnt)
inc a
ret z
dec a
dec a
ld (ix+CHP.SmpCnt),a
push af
ld a,(ix+CHP.SmpIndex)
ld c,a
inc a
and #1F
ld (ix+CHP.SmpIndex),a
pop af
ret nz
ld e,(ix+CHP.SmpPtr)
ld d,(ix+CHP.SmpPtr+1)
ld hl,#60 ; offset to sample metadata
add hl,de
ld a,(hl)
dec a
jp m,c_norept
ld c,a ; repeat sample
inc a
and #1F
ld (ix+CHP.SmpIndex),a
inc hl
ld a,(hl)
inc a
ld (ix+CHP.SmpCnt),a
ret
read_sample: ld d,0
ld e,a
add a,a
add a,e
ld e,a
ld l,(ix+CHP.SmpPtr)
ld h,(ix+CHP.SmpPtr+1)
add hl,de
inc hl
ld a,(hl)
bit 7,a
ld c,#10
jr nz,.no_noise
ld c,d
.no_noise: bit 6,a
ld b,2
jr nz,.no_tone
ld b,d
.no_tone: inc hl
ld e,(hl)
dec hl
dec hl
ld d,(hl)
ld l,a
and #1F
ld h,a
ld a,d
push af
and #F0
rrca
rrca
rrca
rrca
ld d,a
pop af
and #0F
bit 5,l
ld l,a
ret z
set 4,d
ret
set_noise: ld a,c
or a
ret nz
ld a,h
ld (AYREGS+AR.Noise),a
ret
apply_volenv: ld e,0 ; GLOBAL ATTENUATION
sub e
jr nc,.set
xor a
.set ld (hl),a ; if value of attenuation is higher
bit 3,a ; then 8 we will stop also envelopes...
ret z
ld a,(ix+CHP.SmpCnt)
inc a
ret z
ld a,(ix+CHP.EnvState)
or a
ret z
dec a
jr nz,.resetshape
ld (ix+CHP.EnvState),2
jr .setenv
.resetshape: xor a
ld (AYREGS+AR.EnvSh),a
.setenv: set 4,(hl)
ret
get_tone: ld a,l
push af
push de
ld l,(ix+CHP.OrnPtr)
ld h,(ix+CHP.OrnPtr+1)
sample_index: ld de,NULL
add hl,de
ld a,(ix+CHP.Note)
add a,(hl)
get_frequency: add a,0
add a,a
ld e,a
ld d,0
ld hl,freqtable
add hl,de
ld e,(hl)
inc hl
ld d,(hl)
ex de,hl
pop de
pop af
bit 4,d
jr z,.negative
res 4,d
add hl,de
ret
.negative: and a
sbc hl,de
ret
;------------------------------------------------------------------------------
resetfadeout: ld hl,music_setup
noloop: set 7,(hl)
call music_mute
deadend: pop hl
xor a
ld (tempo_cnt),a
dec a
ld (CHN1+CHP.SmpCnt),a
ld (CHN2+CHP.SmpCnt),a
ld (CHN3+CHP.SmpCnt),a
ld (chkfadeout+1),a
ret
enablefade: ld a,48
forcefade: ld (chkfadeout+1),a
ld (countfadeout+1),a
ld (divfadeout+1),a
chkfadeout: ld a,0
or a
ret z
ld a,(music_setup)
rlca
jr c,deadend
countfadeout: ld a,0
dec a
ld (countfadeout+1),a
ret nz
ld a,(apply_volenv+1)
inc a
cp 16
jr z,resetfadeout
ld (apply_volenv+1),a
divfadeout: ld a,0
srl a
ld e,a
srl e
add a,e
jr nz,divfadeout1
inc a
divfadeout1: ld (divfadeout+1),a
add a,a
ld (countfadeout+1),a
ret
;------------------------------------------------------------------------------
positions: dw NULL
ornaments: dw NULL
patterns: dw NULL
samples: dw NULL
speed: db 0
tempo_cnt: db 0
song_length: db 0
chn1_pattptr: dw empty_pattern
chn2_pattptr: dw empty_pattern
chn3_pattptr: dw empty_pattern
empty_pattern: db #FF
VARS
CHN1: ds 10
CHN2: ds 10
CHN3: ds 10
current_pos: db 0
@VARSLEN = $ - VARS
AYREGS: ds 14
;------------------------------------------------------------------------------
freqtable: dw #0EF8, #0E10, #0D60, #0C80, #0BD8, #0B28, #0A88, #09F0
dw #0960, #08E0, #0858, #07E0, #077C, #0708, #06B0, #0640
dw #05EC, #0594, #0544, #04F8, #04B0, #0470, #042C, #03F0
dw #03BE, #0384, #0358, #0320, #02F6, #02CA, #02A2, #027C
dw #0258, #0238, #0216, #01F8, #01DF, #01C2, #01AC, #0190
dw #017B, #0165, #0151, #013E, #012C, #011C, #010B, #00FC
dw #00EF, #00E1, #00D6, #00C8, #00BD, #00B2, #00A8, #009F
dw #0096, #008E, #0085, #007E, #0077, #0070, #006B, #0064
dw #005E, #0059, #0054, #004F, #004B, #0047, #0042, #003F
dw #003B, #0038, #0035, #0032, #002F, #002C, #002A, #0027
dw #0025, #0023, #0021, #001F, #001D, #001C, #001A, #0019
dw #0017, #0016, #0015, #0013, #0012, #0011, #0010, #000F
;------------------------------------------------------------------------------
struct AR ; AY Registers structure
TonA word ; 0
TonB word ; 2
TonC word ; 4
Noise byte ; 6
Mixer byte ; 7
AmplA byte ; 8
AmplB byte ; 9
AmplC byte ; 10
Env word ; 11
EnvSh byte ; 13
ends
struct CHP ; channel parameters structure
EnvState byte
PatStep byte
SmpIndex byte
Note byte
PatStpCnt byte
SmpPtr word
OrnPtr word
SmpCnt byte
ends
;------------------------------------------------------------------------------
ifndef PUREPLAYER
; org #C000
songdata
incbin "songs/qjeta.stc"
; incbin "songs/gasman_prelude.stc"
; incbin "songs/scalex_inferno.stc"
savesna "STC.sna",demo
endif