| 129,8 → 129,8 |
|---|
| mov edx,[sb_base_port] |
| add dl,0xC |
| sb_out 0xD1 ;turn speaker on |
| ; sb_out 0x48 ;set DSP transfer size ;for older cards |
| |
| ; sb_out 0x48 ;set DSP transfer size ;for older cards, not supported |
| ; ;in this version |
| ; mov ax,32767 ;(64k)/2-1 |
| ;@@: ;out the low byte... |
| ; in al,dx |
| 162,7 → 162,7 |
|---|
| ; || |||| |
| ; ---------reserved |
| ;wSize is a number of 16bit samples less 1. For auto-init mode each half |
| ;buffer is (64k)/2 bytes long and, obviously, contains ((64k)/2)/2 bytes |
| ;buffer is (64k)/2 bytes long and, obviously, contains ((64k)/2)/2 samples |
| sb_out (((sb_buffer_size/2/2)-1) and 0xFF) ;wSize.LowByte |
| sb_out (((sb_buffer_size/2/2)-1) shr 8) ;wSize.HighByte |
| ret |
| 192,6 → 192,7 |
|---|
| out dx,al |
| ret |
| endp |
| |
| ;------------------------------------------------------------------------------- |
| ; set the rate for playing, enable stereo |
| ;------------------------------------------------------------------------------- |
| 204,7 → 205,8 |
|---|
| sb_out 41h ;set sound rate, this can only SB16 |
| sb_out (sb_out_rate shr 8) ;first high byte (MSB) |
| sb_out (sb_out_rate and 0xff) ;then low byte (LSB) |
| ; mov al,0xE |
| |
| ; mov al,0xE ;for older cards, not supported in this version |
| ; sub dl,(0xC-4) ;talk to SB's mixer |
| ; out dx,al ;select this register of the mixer |
| ; mov ecx,6 ;wait for the chip |
| 236,4 → 238,60 |
|---|
| ; in al,dx |
| ; loop @b |
| ret |
| endp |
| endp |
| |
| ;------------------------------------------------------------------------------- |
| ; set master volume of SB mixer, note, not only SB16 but SBPro and older |
| ; this is the first step to more full support for hardware |
| ;------------------------------------------------------------------------------- |
| ;in: eax in range [-10000;0] - master volume for _both_ channels |
| ;note that x*3*17/2000 and x*3/2000*17 are not the same numbers, |
| ;because we count in integers |
| proc sb_set_master_vol |
| mov [sb_master_vol],eax |
| add eax,10000 ;SB sound level rise from 0 to MAX_LEVEL |
| lea eax,[eax+eax*2] ;*3 |
| mov ebx,2000 ;divisor |
| xor edx,edx |
| cmp byte[sb_DSP_version_int],4 |
| jae @f ;SBPro's MAX_LEVEL is 15, but we *11 because |
| ;volume byte looks like that: 0xLR, where L - left |
| ;channel volume, R - right, 0<=R,L<=15 |
| div ebx |
| imul eax,17 |
| mov edx,[sb_base_port] |
| push eax ;here for optimisation |
| add dl,4 |
| mov al,0x22 ;write mixer register 0x22 |
| out dx,al |
| in al,dx ;wait for the chip ;6 |
| in al,dx ;wait for the chip ;5 |
| in al,dx ;wait for the chip ;4 |
| in al,dx ;wait for the chip ;3 |
| in al,dx ;wait for the chip ;2 |
| in al,dx ;wait for the chip ;1 |
| pop eax ;go! |
| inc edx |
| out dx,al |
| ret |
| @@: ;SB16's MAX_LEVEL is 255 |
| imul eax,17 |
| div ebx |
| mov edx,[sb_base_port] |
| push eax ;here for optimisation |
| add dl,4 |
| mov al,0x30 ;left speaker |
| out dx,al |
| pop eax ;<--+ |
| inc edx ; \/ |
| push eax ;here for optimisation |
| out dx,al ;write |
| dec edx |
| mov al,0x31 ;right speaker |
| out dx,al |
| pop eax |
| inc edx |
| out dx,al ;write |
| ret |
| endp |
| ;------------------------------------------------------------------------------- |