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SPKR.INC
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
;ÛÛ ÛÛ
;ÛÛ SPKR.INC ÛÛ
;ÛÛ ÛÛ
;ÛÛ IBM Audio Interface Library -- XMIDI interpreter for IBM PC 1-voice ÛÛ
;ÛÛ and Tandy 3-voice internal speakers ÛÛ
;ÛÛ ÛÛ
;ÛÛ Version 1.00 of 10-Nov-91: Initial version for AIL V2.0 release ÛÛ
;ÛÛ 1.01 of 29-Feb-92: Linear pitch/modulation options added ÛÛ
;ÛÛ PC speaker clicks reduced ÛÛ
;ÛÛ 1.02 of 21-Apr-92: Tandy modulation bug fixed ÛÛ
;ÛÛ ÛÛ
;ÛÛ 8086 ASM source compatible with Turbo Assembler v2.0 or later ÛÛ
;ÛÛ Author: John Miles ÛÛ
;ÛÛ ÛÛ
;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
;ÛÛ ÛÛ
;ÛÛ Copyright (C) 1991, 1992 Miles Design, Inc. ÛÛ
;ÛÛ ÛÛ
;ÛÛ Miles Design, Inc. ÛÛ
;ÛÛ 10926 Jollyville #308 ÛÛ
;ÛÛ Austin, TX 78759 ÛÛ
;ÛÛ (512) 345-2642 / FAX (512) 338-9630 / BBS (512) 454-9990 ÛÛ
;ÛÛ ÛÛ
;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
;
;Driver-specific configuration equates
;
IFDEF IBMPC
MAX_REC_CHAN equ 2 ;Max channel recognized by synths
MAX_TRUE_CHAN equ 2 ;Max channel available for locking
NUM_VOICES equ 1 ;# of physical voices available
NUM_SLOTS equ 2 ;# of virtual voices available
ELSEIFDEF TANDY
MAX_REC_CHAN equ 4
MAX_TRUE_CHAN equ 4
NUM_VOICES equ 3
NUM_SLOTS equ 4
ELSEIFDEF CMS
MAX_REC_CHAN equ 13
MAX_TRUE_CHAN equ 13
NUM_VOICES equ 12
NUM_SLOTS equ 13
;soundPort equ 0220h
ENDIF
MIN_TRUE_CHAN equ 2 ;Min channel # (1-based)
DEF_SYNTH_VOL equ 100 ;Init vol=100%
DEF_TC_SIZE equ 0 ;No timbres used
MAX_TIMBS equ 0
VEL_SENS equ 1 ;Velocity sensitivity disabled if 0
VEL_TRUE equ 1 ;Full velocity sensitivity range if 1
;(set to 0 to reduce playback noise)
DEF_PITCH_RANGE equ 12 ;Default pitch wheel range (semitones)
LINEAR_PITCH equ 1 ;0 for semitonal pitch wheel response
EMULATE_MOD equ 0 ;(Active only w/LINEAR_PITCH = 1)
MOD_RATE equ 20 ; FM simulated at 20 Hz
MOD_DEPTH equ 5 ; 5 pitch wheel units/modulation unit
;
;Driver Description Table (DDT)
;Returned by describe_driver() proc
;
DDT LABEL WORD
min_API_version dw 200 ;Minimum API version required = 2.00
drvr_type dw 3 ;Type 3: XMIDI emulation
data_suffix db 4 dup (0) ;No Global Timbre Library used
device_name_o dw OFFSET devnames ;Pointer to list of supported devices
device_name_s dw ?
IFDEF CMS
default_IO dw 0220h ;Factory default I/O CMS port
ELSE
default_IO dw -1 ;Factory default I/O parameters
ENDIF
default_IRQ dw -1
default_DMA dw -1
default_DRQ dw -1
service_rate dw QUANT_RATE ;Request QUANT_RATE calls/second
display_size dw 0 ;No display
devnames LABEL BYTE
IFDEF IBMPC
db 'IBM PC or compatible internal speaker',0
ELSEIFDEF TANDY
db 'Tandy 3-voice internal sound',0
ELSEIFDEF CMS
db 'Creative Music System (CMS) / Game Blaster',0
ENDIF
db 0 ;0 to end list of device names
;
;Default setup values & internal constants
;
IFDEF IBMPC
value_l db 136,181,78,64,65,205,196,61,67,124,42,214
db 136,181,255,209,32,167,226,30,206,190,242,138
db 68,65,127,232,144,99,99,143,231,95,1,189
db 162,160,191,244,72,177,49,199,112,47,254,224
db 209,208,222,251,36,88,152,227,57,151,255,111
db 232,104,239,125,17,172,76,241,156,75,255,183
db 116,52,247,190,136,86,38,248,206,165,127,91
db 58,26,251,223,196,171,147,124,103,82,63,45
value_h db 142,134,253,240,226,213,201,190,179,169,160,150
db 142,134,126,119,113,106,100,95,89,84,79,75
db 71,67,63,59,56,53,50,47,44,42,40,37
db 35,33,31,29,28,26,25,23,22,21,19,18
db 17,16,15,14,14,13,12,11,11,10,9,9
db 8,8,7,7,7,6,6,5,5,5,4,4
db 4,4,3,3,3,3,3,2,2,2,2,2
db 2,2,1,1,1,1,1,1,1,1,1,1
ELSEIFDEF TANDY
value_l db 7,7,9,14,6,0,12,10,10,8,0,9
db 7,7,9,14,6,0,12,10,10,8,0,9
db 7,7,9,14,6,0,12,10,10,8,0,9
db 7,7,9,14,6,0,12,10,10,12,15,5
db 11,3,12,7,3,0,14,13,13,14,15,2
db 5,9,14,3,9,0,7,14,6,15,7,1
db 10,4,15,9,4,0,11,7,3,15,11,8
db 5,2,15,12,10,8,5,3,1,15,13,12
value_h db 53,50,47,44,42,40,37,35,33,63,60,56
db 53,50,47,44,42,40,37,35,33,63,60,56
db 53,50,47,44,42,40,37,35,33,63,60,56
db 53,50,47,44,42,40,37,35,33,31,29,28
db 26,25,23,22,21,20,18,17,16,15,14,14
db 13,12,11,11,10,10,9,8,8,7,7,7
db 6,6,5,5,5,5,4,4,4,3,3,3
db 3,3,2,2,2,2,2,2,2,1,1,1
atten db 15,14,14,14,14,14,14,14,13,13,13,13,13,13,13,13
db 12,12,12,12,12,12,12,12,11,11,11,11,11,11,11,11
db 10,10,10,10,10,10,10,10,9,9,9,9,9,9,9,9
db 8,8,8,8,8,8,8,8,7,7,7,7,7,7,7,7
db 6,6,6,6,6,6,6,6,5,5,5,5,5,5,5,5
db 4,4,4,4,4,4,4,4,3,3,3,3,3,3,3,3
db 2,2,2,2,2,2,2,2,1,1,1,1,1,1,1,1
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
atten_reg db 090h,0b0h,0d0h
part_reg db 080h,0a0h,0c0h
ELSEIFDEF CMS
; Logic channel - first chip/second chip
ChanReg db 000,001,002,003,004,005,000,001,002,003,004,005
; Set octave command
OctavReg db 10h,10h,11h,11h,12h,12h,10h,10h,11h,11h,12h,12h
; Freq
value_l db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
db 003,031,058,083,107,130,151,172,191,209,226,242
; Octave
value_h db 000,000,000,000,000,000,000,000,000,000,000,000
db 001,001,001,001,001,001,001,001,001,001,001,001
db 002,002,002,002,002,002,002,002,002,002,002,002
db 003,003,003,003,003,003,003,003,003,003,003,003
db 004,004,004,004,004,004,004,004,004,004,004,004
db 005,005,005,005,005,005,005,005,005,005,005,005
db 006,006,006,006,006,006,006,006,006,006,006,006
db 007,007,007,007,007,007,007,007,007,007,007,007
; Volume
atten db 0,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2
db 3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4
db 5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6
db 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8
db 9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10
db 11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12
db 13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14
db 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15
ENDIF
vel_graph db 82,85,88,91,94,97,100,103,106,109,112,115,118,121,124,127
;
;Misc. data
;
S_status db NUM_SLOTS dup (?) ;2=key on, 1=key off, 0=slot free
S_voice db NUM_SLOTS dup (?) ;Voice # or -1 assigned to slot
S_channel db NUM_SLOTS dup (?) ;MIDI channel owning slot
S_note db NUM_SLOTS dup (?) ;MIDI note # for slot's voice
S_keynum db NUM_SLOTS dup (?) ;MIDI key # before RBS translation
S_transpose db NUM_SLOTS dup (?) ;MIDI note transposition for slot
S_velocity db NUM_SLOTS dup (?) ;keyon velocity for note
S_sustain db NUM_SLOTS dup (?) ;note sustained if nonzero
S_update db NUM_SLOTS dup (?) ;bit mask for register updates
S_BLOCK db NUM_SLOTS dup (?) ;KON/BLOCK values
S_atten db NUM_SLOTS dup (?) ;Tandy attenuation register setup
S_p_val dw NUM_SLOTS dup (?)
S_mod_value dw NUM_SLOTS dup (?) ;instantaneous pitch for mod emulation
FREE equ 0 ;S_status[] phase equates
KEYON equ 1
KEYOFF equ 2
U_ALL_REGS equ 01000001b ;Bit mask equates for S_update
U_KSLTL equ 01000000b
U_ADSR equ 00100000b
U_FREQ equ 00000001b
MIDI_vol db NUM_CHANS dup (?) ;volume
MIDI_pitch_l db NUM_CHANS dup (?) ;pitchwheel LSB
MIDI_pitch_h db NUM_CHANS dup (?) ;pitchwheel MSB
MIDI_express db NUM_CHANS dup (?) ;expression
MIDI_sus db NUM_CHANS dup (?) ;HOLD1 pedal
MIDI_mod db NUM_CHANS dup (?) ;modulation
MIDI_vprot db NUM_CHANS dup (?) ;voice protection
MIDI_voices db NUM_CHANS dup (?) ;# of voices assigned to channel
V_channel db NUM_VOICES dup (?) ;voice assigned to MIDI channel n or -1
S_V_priority dw NUM_SLOTS dup (?) ;adjusted voice priorities
MOD_accum dw ? ;DDA accumulator for modulation timing
MOD_sign dw ? ;sign (+/-) for modulation
last_val_l db ?
last_val_h db ?
IFDEF CMS
CmsOctaveStore db 6 dup (0)
ChanEnableReg db 2 dup (0)
ENDIF
INCLUDE cms.inc ;define driver procedure call numbers
;****************************************************************************
;* *
;* I/O routines *
;* *
;****************************************************************************
;****************************************************************************
detect_device PROC H,IO_ADDR,IRQ,DMA,DRQ
USES ds,si,di ;Attempt to detect hardware
pushf
cli
cld
IFDEF IBMPC
mov ax,1 ;IBM speaker always present
ELSEIFDEF TANDY
mov ax,0f000h ;search PC BIOS for string 'Tandy'
mov es,ax
mov di,0
mov cx,65535
mov al,'T'
__search_T: repne scasb
jne __not_found
cmp WORD PTR es:[di],'na'
jne __search_T
cmp WORD PTR es:[di+2],'yd'
jne __search_T
jmp __exit ;found, assume Tandy sound available
__not_found: mov ax,0
ELSEIFDEF CMS
call DetectCMS
;mov ax,1 ; Temp
ENDIF
__exit: POP_F
ret
ENDP
;****************************************************************************
reset_synth PROC ;Init hardware regs
USES ds,si,di
pushf
cli
IFDEF IBMPC
in al,61h
and al,11111100b
out 61h,al ;turn the speaker off
ELSEIFDEF TANDY
mov al,9fh ;turn off any active sounds
out 0c0h,al
mov al,0bfh
out 0c0h,al
mov al,0dfh
out 0c0h,al
mov al,68h ;enable internal speaker
out 61h,al
ELSEIFDEF CMS
call cmsReset
;mov ChanEnableReg,0
ENDIF
POP_F
ret
ENDP
;****************************************************************************
;* *
;* Timbre cache management / related API calls *
;* *
;****************************************************************************
;****************************************************************************
protect_timbre PROC H,Bank:BYTE,Num:BYTE
ret
ENDP
;****************************************************************************
unprotect_timbre PROC H,Bank:BYTE,Num:BYTE
ret
ENDP
;****************************************************************************
timbre_status PROC H,Bank:BYTE,Num:BYTE
USES ds,si,di ;Return 0 if timbre not resident
pushf
cli
mov ax,1 ;(no timbres needed)
POP_F
ret
ENDP
;****************************************************************************
get_cache_size PROC H
USES ds,si,di
pushf
cli
mov ax,DEF_TC_SIZE
POP_F
ret
ENDP
;****************************************************************************
define_cache PROC H,Addr:FAR PTR,Size
ret
ENDP
;****************************************************************************
get_request PROC H,Sequence
USES ds,si,di
pushf
cli
mov ax,-1
POP_F
ret
ENDP
;****************************************************************************
install_timbre PROC H,Bank:BYTE,Num:BYTE,Addr:FAR PTR
ret
ENDP
;****************************************************************************
;* *
;* MIDI interpreter and related procedures *
;* *
;****************************************************************************
IF EMULATE_MOD
serve_synth PROC ;Update simulated modulation
USES ds,si,di ;Called once per quantization interval
add MOD_accum,MOD_RATE
cmp MOD_accum,QUANT_RATE
jae __do_M_period
ret
__do_M_period: sub MOD_accum,QUANT_RATE
xor MOD_sign,1
mov si,0 ;mark appropriate voice parameters
__flag_slot: cmp S_status[si],FREE ;as "changed"
je __flag_next
mov bl,S_channel[si]
mov bh,0
mov al,MOD_DEPTH
mul MIDI_mod[bx]
cmp MOD_sign,0
je __store
neg ax
__store: mov bx,si
mov S_mod_value[si][bx],ax
or S_update[si],U_FREQ
call update_voice C,si ;update the hardware registers
__flag_next: inc si
cmp si,NUM_SLOTS
jne __flag_slot
ret
ENDP
ENDIF
;****************************************************************************
init_synth PROC ;Init MIDI synthesizer emulation
USES ds,si,di
pushf
cli
cld
mov di,0
__init_chans: mov MIDI_voices[di],0
inc di
cmp di,NUM_CHANS
jne __init_chans
mov di,0
__init_slots: mov S_status[di],FREE
mov bx,di
mov S_mod_value[di][bx],0
inc di
cmp di,NUM_SLOTS
jne __init_slots
mov di,0
__init_voices: mov V_channel[di],-1
inc di
cmp di,NUM_VOICES
jne __init_voices
mov MOD_accum,0
mov MOD_sign,0
mov last_val_l,-1
mov last_val_h,-1
POP_F
ret
ENDP
;****************************************************************************
assign_voice PROC Slot ;Allocate hardware voice to slot
USES ds,si,di
mov bx,-1 ;try to find an unassigned voice
__search_free: inc bx
cmp bx,NUM_VOICES
je __seize_voice ;(# of active slots > # of voices)
cmp V_channel[bx],-1
jne __search_free
mov si,[Slot] ;found free voice, assign it to slot
mov S_voice[si],bl
mov di,bx
mov bl,S_channel[si]
inc MIDI_voices[bx]
mov V_channel[di],bl
mov S_update[si],U_ALL_REGS
call update_voice C,si ;update the hardware
ret
__seize_voice: call update_priority ;assign voice based on priority search
ret
ENDP
;****************************************************************************
release_voice PROC Slot ;Release slot's voice
USES ds,si,di
mov si,[Slot]
cmp S_voice[si],-1
je __exit
and S_BLOCK[si],11011111b
or S_update[si],U_FREQ ;force KON = 0...
call update_voice C,si ;...silence any note...
mov bh,0 ;...and deallocate the voice
mov bl,S_channel[si]
dec MIDI_voices[bx]
mov bl,S_voice[si]
mov V_channel[bx],-1
mov S_voice[si],-1
__exit: ret
ENDP
;****************************************************************************
VAL_SHIFT MACRO
IFDEF TANDY
mov cl,ah
mov ch,0
shl cx,1
shl cx,1
shl cx,1
shl cx,1
or cl,al
mov ax,cx
ENDIF
ENDM
RECOMBINE MACRO
IFDEF TANDY
mov cx,ax
shr cx,1
shr cx,1
shr cx,1
shr cx,1
mov ah,cl
and al,0fh
ENDIF
ENDM
update_voice PROC Slot ;Update hardware regs for slot
USES ds,si,di
LOCAL voice,vol:BYTE
LOCAL f_num
LOCAL val_l:BYTE,val_h:BYTE
LOCAL pitch,notenum,mid_val
LOCAL lvol:BYTE,rvol:BYTE
LOCAL MOD_value
NOJUMPS
mov si,[Slot] ;update only requested parameters for
;speed
mov bl,S_voice[si]
cmp bl,-1
je __exit ;no hardware voice assigned, exit
mov bh,0
mov ah,0
mov voice,bx ;voice #
test S_update[si],U_KSLTL
jnz __go_KSLTL
__KSLTL_done: test S_update[si],U_FREQ
jnz __go_FREQ ;(update FREQ's KeyOn bit last)
__FREQ_done:
__exit: ret
__go_KSLTL: jmp __KSLTL
__go_FREQ: jmp __FREQ
;----------------------------------------------------------------------------
__KSLTL: IFDEF IBMPC
ELSE ;IFDEF TANDY
mov di,WORD PTR S_channel[si]
and di,0fh ;DI = MIDI channel
mov al,MIDI_vol[di]
mul MIDI_express[di]
shl ax,1 ;(AX*2)/256 = AX/128 ÷ AX/127
mov al,ah
cmp al,1
sbb al,-1 ;(error = 1/127 units; round up if !0)
mul S_velocity[si]
shl ax,1
mov al,ah
cmp al,1
sbb al,-1 ;(error = 1/127 units; round up if !0)
mov ah,0
mov bx,ax ;BX=composite (vol+expression) volume
mov al,atten[bx]
mov S_atten[si],al
or S_update[si],U_FREQ ;signal need to update keyon volume
ENDIF
and S_update[si],NOT U_KSLTL
jmp __KSLTL_done
;----------------------------------------------------------------------------
__FREQ: test S_BLOCK[si],00100000b
jnz __key_on ;KON bit = 1; turn note on
IFDEF IBMPC
in al,61h ;turn IBM speaker off
and al,11111100b
out 61h,al
ELSEIFDEF TANDY
mov bx,voice
mov al,atten_reg[bx]
or al,0fh ;set maximum Tandy attenuation
out 0c0h,al
ELSEIFDEF CMS
call CmsSound C,voice,0,0,0,0
ENDIF
jmp __end_freq
__key_on: mov bl,S_channel[si] ;get pitch bend word value
mov bh,0
mov al,MIDI_pitch_h[bx]
mov ah,0
mov cx,7
shl ax,cl
or al,MIDI_pitch_l[bx]
mov pitch,ax ;store it
mov bl,S_note[si] ;get key # 12-108
mov bh,0
mov al,S_transpose[si]
cbw
add bx,ax
sub bx,24 ;normalize to 0-95
__norm_1: add bx,12
cmp bx,0
jl __norm_1
add bx,12
__norm_2: sub bx,12
cmp bx,95
jg __norm_2
mov notenum,bx ;store it
IF LINEAR_PITCH
push si
push di
shl si,1
mov ax,S_mod_value[si]
mov MOD_value,ax
mov bx,notenum ;get upper and lower note value bounds
sub bx,DEF_PITCH_RANGE
jg __lin_1
mov bx,0
__lin_1: mov al,value_l[bx]
mov ah,value_h[bx]
VAL_SHIFT
mov si,ax ;SI=low value
mov bx,notenum
add bx,DEF_PITCH_RANGE
cmp bx,95
jb __lin_2
mov bx,95
__lin_2: mov al,value_l[bx]
mov ah,value_h[bx]
VAL_SHIFT
mov di,ax ;DI=high value
mov bx,notenum
mov al,value_l[bx]
mov ah,value_h[bx]
VAL_SHIFT
mov dx,ax ;DX=0 value
mov mid_val,dx
mov ax,pitch
sub ax,2000h ;E000=min 0=none 1FFF=max
add ax,MOD_value
cmp ax,0
jl __neg
sub di,dx
mov dx,di ;positive bend: DX = maximum
jmp __set
__neg: sub dx,si ;negative bend: DX = maximum
__set: imul dx
mov cx,2000h
idiv cx
add ax,mid_val
RECOMBINE
mov val_l,al
mov val_h,ah
pop di
pop si
ELSE
mov ax,pitch
sub ax,1fffh
mov cx,5 ;divide by 0x20, preserving sign
sar ax,cl ;(range now +0x100 to -0x0FF)
mov cl,DEF_PITCH_RANGE
mov ch,0 ;normally 12 (+0xc00 to -0xBF4)
imul cx
add ah,BYTE PTR notenum ;add computed note offset * 256
add ax,8 ;add 1/32 to round to 1/16
mov cx,4 ;derive true note #
sar ax,cl ;(expressed in 1/16 halftones)
sub ax,(12*16)
__norm_3: add ax,(12*16)
cmp ax,0
jl __norm_3
add ax,(12*16)
__norm_4: sub ax,(12*16)
cmp ax,(96*16)-1
jg __norm_4
shr ax,1
shr ax,1
shr ax,1
shr ax,1
mov bx,ax
mov al,value_l[bx]
mov val_l,al
mov al,value_h[bx]
mov val_h,al
ENDIF ;LINEAR_PITCH
IFDEF IBMPC
mov bl,val_l ;avoid redundant timer resets to
mov bh,val_h ;reduce clicks
cmp bl,last_val_l
jne __set_freq
cmp bh,last_val_h
je __on
__set_freq: mov al,0b6h ;program speaker frequency on Timer 2
out 43h,al
jmp $+2
mov al,bl
out 42h,al
jmp $+2
mov al,bh
out 42h,al
jmp $+2
mov last_val_l,bl
mov last_val_h,bh
__on: in al,61h
or al,00000011b
out 61h,al ;turn the PC speaker on
ELSEIFDEF TANDY
mov di,voice ;set Tandy freq, keyon level
mov al,part_reg[di]
or al,val_l
out 0c0h,al
jmp $+2
mov al,val_h
out 0c0h,al
jmp $+2
mov al,atten_reg[di]
or al,S_atten[si]
out 0c0h,al
ELSEIFDEF CMS
xor ah,ah
mov al,val_l ; ax = frequence
xor ch,ch
mov cl,val_h ; cx = octave
xor dh,dh
mov dl,S_atten[si] ; dx = amplitude
;mov dx,15
call CmsSound C,voice,ax,cx,dx,dx
ENDIF ;TANDY
__end_freq: and S_update[si],NOT U_FREQ
jmp __FREQ_done
JUMPS
ENDP
;****************************************************************************
update_priority PROC ;Maintain synthesizer voice priority
LOCAL vcount,low_p,high_p
USES ds,si,di
mov dx,0 ;zero active slot count
mov si,-1
__get_priority: inc si ;build adjusted priority table and
cmp si,NUM_SLOTS ;reallocate voices if necessary
je __chk_demand
cmp S_status[si],FREE
je __get_priority
inc dx ;slot active, bump count
mov bx,si
mov di,WORD PTR S_channel[si]
and di,0fh ;DI = slot's MIDI channel
mov ax,0ffffh
cmp MIDI_vprot[di],64 ;priority = max if voice protection on
jge __adj_priority
mov ax,S_p_val[bx][si]
__adj_priority: mov cl,MIDI_voices[di] ;AX = slot's base priority
mov ch,0
sub ax,cx ;priority -= # of voices in channel
jnc __set_priority
mov ax,0
__set_priority: mov S_V_priority[bx][si],ax
jmp __get_priority
__chk_demand: cmp dx,NUM_VOICES ;more active slots than voices?
jbe __exit ;no, exit
mov vcount,dx
__sort_p_list: mov ax,0 ;set AX = unvoiced highest priority
mov dx,-1 ;set DX = voiced lowest priority
mov si,-1
__for_slot: inc si
cmp si,NUM_SLOTS
je __reassign
cmp S_status[si],FREE
je __for_slot
mov bx,si
mov di,S_V_priority[bx][si]
cmp S_voice[si],-1
jne __chk_low
cmp di,ax
jb __for_slot
mov ax,di
mov high_p,si ;highest-priority unvoiced slot index
jmp __for_slot
__chk_low: cmp di,dx
ja __for_slot
mov dx,di
mov low_p,si ;lowest-priority voiced slot index
jmp __for_slot
__reassign: cmp ax,dx ;highest unvoiced < lowest voiced?
jb __exit ;yes, we're done
mov si,low_p
mov bh,0
mov bl,S_voice[si]
push bx
call release_voice C,si
mov S_status[si],FREE ;release any slots deallocated...
pop bx
mov si,high_p
mov S_voice[si],bl
mov di,bx
mov bl,S_channel[si]
inc MIDI_voices[bx]
mov V_channel[di],bl
mov S_update[si],U_ALL_REGS
call update_voice C,si ;update the hardware
dec vcount
jnz __sort_p_list ;keep sorting until priorities valid
__exit: ret
ENDP
;****************************************************************************
slot_phase PROC Slot ;Set up slot parameters
USES ds,si,di
mov si,[Slot]
mov bx,si
shl bx,1
mov S_BLOCK[si],00100000b ;set KON, clear BLOCK mask
mov S_p_val[bx],32767 ;instrument priority = average
mov S_update[si],U_ALL_REGS ;flag all registers "dirty"
ret
ENDP
;****************************************************************************
note_off PROC Chan:BYTE,Note:BYTE
USES ds,si,di ;Turn MIDI note off
mov si,-1 ;find all slots in which note is
__next_slot: mov al,[Note] ;playing
mov bl,[Chan]
__find_note: inc si
cmp si,NUM_SLOTS
je __exit
cmp S_status[si],KEYON
jne __find_note
cmp S_keynum[si],al
jne __find_note
cmp S_channel[si],bl
jne __find_note
mov bh,0
cmp MIDI_sus[bx],64
jge __sustained
call release_voice C,si ;release the slot's voice
mov S_status[si],FREE
jmp __next_slot
__sustained: mov S_sustain[si],1
jmp __next_slot
__exit: ret
ENDP
;****************************************************************************
note_on PROC Chan,Note,Velocity ;Turn MIDI note on
USES ds,si,di
mov di,[Chan]
mov si,0
__find_slot: cmp S_status[si],FREE
je __slot_found
inc si ;find a free virtual voice slot
cmp si,NUM_SLOTS
jne __find_slot
jmp __exit ;exit if no virtual voice available
__slot_found: mov ax,[Chan] ;establish MIDI channel
mov S_channel[si],al
mov dx,[Note]
mov S_keynum[si],dl ;save MIDI key #
mov S_note[si],dl
mov S_transpose[si],0 ;(no transposition)
IF VEL_SENS
mov ax,[Velocity] ;establish note velocity
IF NOT VEL_TRUE
shr al,1
shr al,1
shr al,1
lea bx,vel_graph ;scale back velocity sensitivity to
xlat cs:[bx] ;reduce perceived playback noise
ENDIF
ELSE
mov al,127 ;default velocity = 127
ENDIF
mov S_velocity[si],al
mov S_status[si],KEYON ;flag note "on" in slot
mov S_sustain[si],0 ;init sustained flag