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modplay.inc
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modplay.inc
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; MOD player (c) 2002 mls
;
; generates samples for 11000 HZ
; bpm always 125
%if 0
init
loadmod
play
playmod
playsamp
setvol
getvol
getstate
stop
%endif
; pl_loadmod - configure a mod player
; es:esi start of player
; es:edi start of mod
pl_loadmod:
push edi
lea edi,[esi+pl_state]
xor eax,eax
mov ecx,pl_sizeof-pl_state
rep stosb
pop edi
mov edx,esi
mov ecx,4
push esi
add esi,pl_channs
sm10:
mov [es:esi+ch_player],edx
add esi,ch_sizeof
loop sm10
pop esi
mov edx,32
mov eax,[es:edi+0x438]
cmp eax,'CHN4'
jz sm2
cmp eax,'M.K.'
jz sm2
cmp eax,'M&K!'
jz sm2
cmp eax,'FLT4'
jz sm2
mov dl,16
sm2:
add edi,20+22
mov [es:esi+pl_sampinfo],edi
sub edi,22+30
imul ecx,edx,30
add edi,ecx
mov al,[es:edi]
mov [es:esi+pl_songlen],al
inc edi
inc edi
mov [es:esi+pl_song],edi
xor ebx,ebx
mov ecx,128
sm5:
mov al,[es:edi]
inc edi
cmp bl,al
jge sm4
mov bl,al
sm4:
loop sm5
inc bl
cmp dl,32
jnz sm6
add edi,4
sm6:
mov [es:esi+pl_patterns],edi
shl ebx,6+4 ; *64*16
add ebx,edi
mov byte [es:esi+pl_speed],6
mov byte [es:esi+pl_effpos],6
mov byte [es:esi+pl_loaded],1
mov edi,[es:esi+pl_sampinfo]
lea ecx,[edx-1]
sm9:
mov [es:esi+pl_sampd+4],ebx ; +4 -> skip first?
movzx eax,word [es:edi]
xchg al,ah
add ebx,eax
add ebx,eax
add esi,4
add edi,30
loop sm9
ret
; pl_play - play modfile
; es:esi start of player
; es:edi buffer to add samples
pl_play:
pusha
push edi
call fixvol
mov ax,[es:esi+pl_state]
or ax,ax
jz p3
dec ax
jnz p1
; run effects
push esi
add esi,pl_channs
mov ecx,4
p31:
mov ax,[es:esi+ch_effect]
or ax,ax
jz p30
call doeff
call norm
p30:
add esi,ch_sizeof
loop p31
pop esi
inc word [es:esi+pl_effpos]
mov ax,[es:esi+pl_effpos]
cmp ax,[es:esi+pl_speed]
jb p1
; advance note
xor eax,eax
mov [es:esi+pl_effpos],ax
mov bx,[es:esi+pl_nextsongnum]
mov [es:esi+pl_songnum],bx
mov cx,[es:esi+pl_songlen]
cmp bx,cx
jb p2
p3:
mov [es:esi+pl_state],ax
pop edi
popa
ret
p2:
mov dx,[es:esi+pl_nextnotenum]
mov [es:esi+pl_notenum],dx
cmp dx,64
jnb p3
inc edx
cmp dl,64
jb p4
xor dl,dl
inc ebx
cmp bx,cx
jb p5
xor ebx,ebx
p5:
mov [es:esi+pl_nextsongnum],bx
p4:
mov [es:esi+pl_nextnotenum],dx
; interpret events for each channel
movzx ebx,word [es:esi+pl_songnum]
add ebx,[es:esi+pl_song]
mov bl,[es:ebx]
cmp bl,0x80
jb p11
xor bl,bl
p11:
movzx ebx,bl
shl ebx,6
movzx ecx,word [es:esi+pl_notenum]
add ebx,ecx
shl ebx,4
add ebx,[es:esi+pl_patterns]
mov edi,[es:esi+pl_sampinfo]
push esi
add esi,pl_channs
mov ecx,4
p18:
mov ah,[es:ebx]
and ah,0x10
mov al,[es:ebx+2]
shr al,4
or al,ah
jz p16
call setsamp
p16:
mov ah,[es:ebx]
and ah,0x0f
mov al,[es:ebx+1]
or ax,ax
jz p17
mov [es:esi+ch_pitchgoal],ax
mov dl,[es:ebx+2]
inc dl
or dl,0xf2
cmp dl,0xf6
jz p17
mov [es:esi+ch_pitch],ax
xor eax,eax
mov [es:esi+ch_pointer],ax
mov [es:esi+ch_pointer8],ax
mov ax,[es:esi+ch_send]
mov [es:esi+ch_end],ax
p17:
xor eax,eax
mov [es:esi+ch_effect],ax
mov dl,[es:ebx+3]
mov al,[es:ebx+2]
and al,0x0f
or dl,al
jz p29
push edi
mov edi,[es:esi+ch_player]
mov dl,[es:ebx+3]
xor dh,dh
call effects
pop edi
p29:
call norm
add esi,ch_sizeof
add ebx,4
dec ecx
jnz p18
pop esi
; prepare playing of each channel
p1:
push esi
add esi,pl_channs
mov ecx,4
p10:
mov ax,[es:esi+ch_end]
or ax,ax
jnz p6
p8:
mov dword [es:esi+ch_start],0
jmp p7
p6:
mov ax,[es:esi+ch_pitch]
or ax,ax
jz p8
movzx ebx,word [es:esi+ch_samp]
or ebx,ebx
jz p8
mov edx,esi
pop esi
push esi
shl ebx,2
add esi,ebx
mov ebx,[es:esi+pl_sampd]
xchg esi,edx
mov [es:esi+ch_start],ebx
mov dx,[es:esi+ch_finetune]
add dx,dx
jz p9
mov dx,[fttab]
mul dx
shl ax,1
mov ax,dx
adc ax,ax
p9:
mov bx,ax
mov ax,57213
xor edx,edx
div bx
mov [es:esi+ch_step],ah
mov [es:esi+ch_step8],al
p7:
add esi,ch_sizeof
loop p10
pop esi
; now generate 320 samples for each channel
pop edi
add esi,pl_channs
mov eax,320
p21:
push eax
mov ecx,4
p20:
mov ebx,[es:esi+ch_start]
or ebx,ebx
jz p22
movzx eax,word [es:esi+ch_pointer]
add ebx,eax
movsx dx,[es:ebx]
shl dx,2
inc eax
cmp ax,[es:esi+ch_end]
jnb p23
inc ebx
movsx ax,[es:ebx]
push ecx
mov cx,[es:esi+ch_pointer8]
or cx,cx
jz p24
sar dx,2
imul ax,cx
neg cl
imul dx,cx
add dx,ax
sar dx,6
p24:
pop ecx
p23:
imul dx,[es:esi+ch_volume]
sar dx,2
push esi
mov esi,[es:esi+ch_player]
movzx eax,word [es:esi+pl_volume]
pop esi
movsx edx,dx
imul edx
sar eax,16
add ax,word [es:edi]
jno p40
mov ax,32767
js p40
inc eax
p40:
mov [es:edi],ax
mov bx,[es:esi+ch_pointer8]
mov ax,[es:esi+ch_pointer]
add bl,[es:esi+ch_step8]
adc ax,[es:esi+ch_step]
mov [es:esi+ch_pointer8],bl
cmp ax,[es:esi+ch_end]
jb p25
mov ax,[es:esi+ch_roff]
mov bx,[es:esi+ch_rend]
mov [es:esi+ch_end],bx
or bx,bx
jnz p25
mov dword [es:esi+ch_start],0
p25:
mov [es:esi+ch_pointer],ax
p22:
add esi,ch_sizeof
dec ecx
jnz p20
add edi,2
sub esi,ch_sizeof * 4
pop eax
dec eax
jnz p21
sub esi,pl_channs
mov ax,[es:esi+pl_state]
dec ax
jz p50
add esi,pl_channs
mov ecx,4
p51:
mov eax,[es:esi+ch_start]
or eax,eax
jnz p50
add esi,ch_sizeof
loop p51
sub esi,ch_sizeof * 4 + pl_channs
mov [es:esi+pl_state],ax
p50:
popa
ret
fttab dw 32768, 32532, 32298, 32066
dw 31835, 31606, 31378, 31153
dw 34716, 34466, 34219, 33972
dw 33728, 33485, 33244, 33005
; norm - normalize channel values
; es:esi start of chanel
norm:
push eax
mov ax,[es:esi+ch_volume]
or ax,ax
jns n1
xor eax,eax
n1:
cmp ax,64
jb n2
mov ax,64
n2:
mov [es:esi+ch_volume],ax
mov ax,[es:esi+ch_pitch]
or ax,ax
jnb n3
xor eax,eax
mov [es:esi+ch_pitch],ax
n3:
pop eax
ret
; effects - interpret effect
; ax effect
; dx arg
; es:edi start of player
; es:esi start of channel
;
; trashes ax, dx
effects:
movzx edx,dx
or al,al
jnz e1
mov [es:esi+ch_arpindex],ax
mov ax,[es:esi+ch_pitch]
mov [es:esi+ch_arp],ax
push edx
push eax
shr dl,4
jz e1b
mov dx,[arptab+2*edx]
mul dx
mov ax,dx
e1b:
mov [es:esi+ch_arp+2],ax
pop eax
pop edx
and dl,0x0f
jz e1a
mov dx,[arptab+2*edx]
mul dx
mov ax,dx
e1a:
mov [es:esi+ch_arp+4],ax
mov byte [es:esi+ch_effect],EFF_ARP
ret
e1:
cmp al,1
jnz e2
neg dx
jmp e3
e2:
cmp al,2
jnz e4
e3:
or dl, dl
jz e5
mov [es:esi+ch_slide],dx
e5:
mov byte [es:esi+ch_effect],EFF_SLIDE
ret
e4:
cmp al,3
jnz e6
or dl,dl
jz e7
mov [es:esi+ch_pitchrate],dx
e7:
mov byte [es:esi+ch_effect],EFF_PORTA
ret
e6:
cmp al,4
jnz e8
mov ax,dx
shr ax,4
jz e9
mov [es:esi+ch_vibrate],ax
e9:
and dl,0x0f
jz e10
mov [es:esi+ch_vibdepth],dx
e10:
mov byte [es:esi+ch_effect],EFF_VIBRA
ret
e8:
cmp al,5
jnz e11
mov byte [es:esi+ch_effect],EFF_PORTASLIDE
jmp e12
e11:
cmp al,6
jnz e13
mov byte [es:esi+ch_effect],EFF_VIBRASLIDE
jmp e12
e13:
cmp al,9
jnz e14
mov ax,[es:esi+ch_samp]
or al,al
jz e15
xor eax,eax
mov [es:esi+ch_pointer8],ax
mov ax,[es:esi+ch_send]
mov [es:esi+ch_end],ax
shl dx,8
cmp dx,ax
jb e16
sub dx,ax
mov ax,[es:esi+ch_rend]
mov [es:esi+ch_end],ax
sub ax,[es:esi+ch_roff]
jz e17
e18:
cmp dx,ax
jb e17
sub dx,ax
jmp e18
e17:
add dx,[es:esi+ch_roff]
e16:
mov [es:esi+ch_pointer],dx
e15:
ret
e14:
cmp al,10
jnz e19
mov byte [es:esi+ch_effect],EFF_SLIDEVOL
e12:
mov ax,dx
and dl,0x0f
jz e20
neg dx
jmp e21
e20:
mov dx,ax
shr dl,4
e21:
mov [es:esi+ch_volumerate],dx
ret
e19:
cmp al,11
jnz e22
mov [es:edi+pl_nextsongnum],dx
xor edx,edx
mov [es:edi+pl_nextnotenum],dx
ret
e22:
cmp al,12
jnz e23
mov [es:esi+ch_volume],dx
ret
e23:
cmp al,13
jnz e24
mov ax,dx
shr al,4
imul ax,10
and dx,0x0f
add dx,ax
mov [es:edi+pl_nextnotenum],dx
mov dx,[es:edi+pl_songnum]
inc dx
mov ax,[es:edi+pl_songlen]
cmp dx,ax
jb e25
xor edx,edx
e25:
mov [es:edi+pl_nextsongnum],dx
ret
e24:
cmp al,15
jnz e27
cmp dl,32
jnb e26
mov [es:edi+pl_speed],dx
e26:
ret
e27:
cmp al,14
jnz e26
mov al,dl
shr al,4
and dl,0x0f
cmp al,1
jnz e28
e30:
add [es:esi+ch_pitch],dx
ret
e28:
cmp al,2
jnz e29
neg dx
jmp e30
e29:
cmp al,5
jnz e31
mov [es:esi+ch_finetune],dx
ret
e31:
cmp al,6
jnz e32
or dl,dl
jnz e33
mov dx,[es:edi+pl_notenum]
mov [es:edi+pl_loop_notenum],dx
ret
e33:
mov ax,[es:edi+pl_loop_counter]
or ax,ax
jnz e34
mov ax,dx
inc ax
e34:
dec ax
mov [es:edi+pl_loop_counter],ax
jz e35
mov dx,[es:edi+pl_loop_notenum]
mov [es:edi+pl_nextnotenum],dx
e35:
ret
e32:
cmp al,9
jnz e36
mov [es:esi+ch_retrig],dx
mov [es:esi+ch_current],dx
mov byte [es:esi+ch_effect],EFF_RETRIG
ret
e36:
cmp al,10
jnz e37
e39:
add [es:esi+ch_volume],dx
ret
e37:
cmp al,11
jnz e38
neg dx
jmp e39
e38:
cmp al,12
jnz e40
mov [es:esi+ch_retrig],dx
mov byte [es:esi+ch_effect],EFF_CUT
ret
e40:
cmp al,13
jnz e41
mov [es:esi+ch_current],dx
mov dx,[es:esi+ch_samp]
mov [es:esi+ch_latesamp],dx
xor edx,edx
mov [es:esi+ch_samp],dx
mov byte [es:esi+ch_effect],EFF_LATESTART
ret
e41:
cmp al,14
jnz e42
inc dx
imul dx,[es:edi+pl_speed]
sub [es:edi+pl_effpos],dx
e42:
ret
arptab dw 0, 61858, 58386, 55109
dw 52016, 49097, 46341, 43740
dw 41285, 38968, 36781, 34716
dw 32768, 30929, 29193, 27554
; doeff - apply channel effect
; ax effect
; es:esi start of chanel
;
; trashes ax, bx
doeff:
bt ax,3
jnc d1
mov bx,[es:esi+ch_volumerate]
add [es:esi+ch_volume],bx
sub al,8
d1:
cmp al,EFF_ARP
jnz d2
movzx ebx,word [es:esi+ch_arpindex]
inc bl
cmp bl,3
jb d3
xor bl,bl
d3:
mov [es:esi+ch_arpindex],bl
add bl,bl
mov ax,[es:esi+ebx+ch_arp]
mov [es:esi+ch_pitch],ax
ret
d2:
cmp al,EFF_SLIDE
jnz d4
mov ax,[es:esi+ch_slide]
add [es:esi+ch_pitch],ax
ret
d4:
cmp al,EFF_PORTA
jnz d5
mov ax,[es:esi+ch_pitch]
mov bx,[es:esi+ch_pitchgoal]
cmp ax,bx
jnb d6
add ax,[es:esi+ch_pitchrate]
cmp ax,bx
jb d7
d8:
mov ax,bx
d7:
mov [es:esi+ch_pitch],ax
ret
d6:
sub ax,[es:esi+ch_pitchrate]
cmp ax,bx
jb d8
jmp d7
d5:
cmp al,EFF_VIBRA
jnz d9
mov bx,[es:esi+ch_viboffset]
add bx,[es:esi+ch_vibrate]
and ebx,0x3f
mov [es:esi+ch_viboffset],bx
mov ax,[vibtab+2*ebx]
imul ax,[es:esi+ch_vibdepth]
sar ax, 8
add ax,[es:esi+ch_pitchgoal]
mov [es:esi+ch_pitch],ax
d12:
ret
d9:
cmp al,EFF_RETRIG
jnz d10
dec word [es:esi+ch_current]
jz d11
jns d12
d11:
mov ax,[es:esi+ch_retrig]
mov [es:esi+ch_current],ax
mov ax,[es:esi+ch_send]
mov [es:esi+ch_end],ax
xor eax,eax
mov [es:esi+ch_pointer],ax
mov [es:esi+ch_pointer8],ax
ret
d10:
cmp al,EFF_CUT
jnz d13
mov ax,[es:esi+ch_retrig]
jz d14
dec word [es:esi+ch_retrig]
jnz d14
xor eax,eax
mov [es:esi+ch_volume],ax
d14:
ret
d13:
cmp al,EFF_LATESTART
jnz d14
dec word [es:esi+ch_current]
jz d15
jns d14
d15:
call d11
mov [es:esi+ch_current],ax
mov [es:esi+ch_effect],ax
mov ax,[es:esi+ch_latesamp]
mov [es:esi+ch_samp],ax
ret
vibtab dw 0, 50, 100, 149, 196, 241, 284, 325
dw 362, 396, 426, 452, 473, 490, 502, 510
dw 512, 510, 502, 490, 473, 452, 426, 396
dw 362, 325, 284, 241, 196, 149, 100, 50
dw 0, -49, -99,-148,-195,-240,-283,-324
dw -361,-395,-425,-451,-472,-489,-501,-509
dw -511,-509,-501,-489,-472,-451,-425,-395
dw -361,-324,-283,-240, -195,-148,-99, -49
; fixvol - fixup volume
; es:esi start of volblock
fixvol:
push eax
push ebx
mov ax,[es:esi+vo_volume]
mov bx,[es:esi+vo_volumegoal]
cmp ax,bx
jz vo3
jnb vo1
add ax,[es:esi+vo_volumerate]
jc vohit
cmp ax,bx
jb vo2
vohit:
mov ax,bx
vo2:
mov [es:esi+vo_volume],ax
vo3:
pop ebx
pop eax
ret
vo1:
sub ax,[es:esi+vo_volumerate]
jc vohit
cmp ax,bx
jb vohit
jmp vo2
; vo_setvol - set volume
;
; es:esi start of volblock
; ax goal
; bx rate 0=immediate 50=one sec
vo_setvol:
mov [es:esi+vo_volumegoal],ax
or bx,bx
jnz sv1
mov [es:esi+vo_volume],ax
mov [es:esi+vo_volumerate],bx
ret
sv1:
push eax
stc
sbb eax,eax
push edx
div bx
pop edx
mov [es:esi+vo_volumerate],ax
pop eax
ret
; getvol - get volume
; es:esi start of volblock
vo_getvol:
mov ax,[es:esi+vo_volume]
ret
; pl_playmod - play a modfile
; es:esi start of player
; ax start of song
pl_playmod:
cmp byte [es:esi+pl_loaded],1
jz pm0
ret
pm0:
xor ebx,ebx
mov [es:esi+pl_state],bx
mov byte [es:esi+pl_speed],6
mov byte [es:esi+pl_effpos],6
mov [es:esi+pl_nextsongnum],ax
mov [es:esi+pl_nextnotenum],bx
call clearchans
inc ebx
mov [es:esi+pl_state],bx
ret
; pl_playsamp - play a sample
; es:esi start of player
; ax channel number
; bx sample number
; cx pitch
pl_playsamp:
cmp byte [es:esi+pl_loaded],1
jz ps0
ret
ps0:
push eax
mov ax,[es:esi+pl_state]
dec ax
dec ax
jz ps1
call clearchans
ps1:
pop eax
push esi
mov edi,[es:esi+pl_sampinfo]
add esi,pl_channs
imul eax,ch_sizeof
add esi,eax
xor eax,eax
mov [es:esi+ch_start],eax
mov [es:esi+ch_effect],ax
mov [es:esi+ch_pointer],ax
mov [es:esi+ch_pointer8],ax
mov [es:esi+ch_pitch],cx
mov eax,ebx
or ax,ax
jz ps2
call setsamp
ps2:
mov ax,[es:esi+ ch_send]
mov [es:esi+ch_end],ax
pop esi
mov byte [es:esi + pl_state],2
ret
; pl_getstate - get state of player
; es:esi start of player
pl_getstate:
mov ax,[es:esi+pl_state]
ret
; pl_stop - stop something?
; es:esi start of player
pl_stop:
mov byte [es:esi+pl_state],0
ret
; clearchans - stop all channels
; es:esi start of player
clearchans:
push esi
push ecx
push eax
xor eax,eax
add esi,pl_channs
mov ecx,4
cc1:
mov [es:esi+ch_start],eax
mov [es:esi+ch_effect],ax
add esi,ch_sizeof
loop cc1
pop eax
pop ecx
pop esi
ret
; setsamp - start a sample
; es:esi start of channel
; es:edi start of sampinfo
; ax sample number
;
; trashes ax, dx
setsamp:
movzx eax,al
mov [es:esi+ch_samp],ax
dec ax
imul ax,30
push ebx
mov ebx,eax
mov ax,[es:edi+ebx]
xchg ah,al
add ax,ax
mov [es:esi+ch_send],ax
mov ax,[es:edi+ebx+4]
xchg ah,al
add ax,ax
mov [es:esi+ch_roff],ax
mov dx,[es:edi+ebx+6]
xchg dh,dl
add dx,dx
mov [es:esi+ch_rend],dx
add ax,dx
mov dx,[es:esi+ch_send]
dec ax
dec ax
cmp ax,dx
jna ss13
shr word [es:esi+ch_roff],1
ss13:
mov ax,[es:esi+ch_roff]
add ax,[es:esi+ch_rend]
cmp dx,[es:esi+ch_roff]
jnb ss14
ss16:
xor eax,eax
mov [es:esi+ch_roff],ax
ss14:
cmp dx,ax
jnb ss15
mov ax,dx
ss15:
mov [es:esi+ch_rend],ax
dec ax
dec ax
jz ss16
mov al,[es:edi+ebx+2]