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;---------------------------------------------------------------------

;

;   MenuetOS AC97 WAV Player

;

;    0.03  November 10, 2004  doesn't halt if file not found

;    0.04  November 11, 2004  better positioning (with mouse)

;    0.05  November 14, 2004  internals clean up

;                             fixed cutting sound at the edges

;    0.06  November 17, 2004  fixed many bugs

;    0.07  Nov      20, 2004  deactivates text box when 'play' pressed

;                             stops playing before closing a window

;    0.08  Nov      24, 2004  added support for 8bit and mono modes

;                             +variable rate for some chipsets

;    0.09  August   26, 2006  modified to use function 70

;

;   Use [flat assembler 1.64] to compile.

;

;---------------------------------------------------------------------

  use32 	 ; turn on 32 bit mode

  org	  0x0	      ; the program is placed at 0 offset

  db	 'MENUET01'	; 8-byte identifier of MenuetOS application

  dd	 0x01	      ; header version (always 1)

  dd	 START	       ; address of the beginning of the code

  dd	 IMAGE_END     ; size of the program's image

  dd	 MEMORY_END	; how much memory does it need

  dd	 STACK_P     ; a pointer to the top of the stack

  dd	 textbox_string

;  dd     0x0             ; address of buffer for parameters (not used)

  dd	 0x0	     ; reserved

;---------------------------------------------------------------------

include "macros.inc"	 ; standart macros & constants

include "meosfunc.inc"	   ; MenuetOS API functions names

include "debug.inc"	; printing to debug board

include "constant.inc"	   ; BIT?? constants

include "ac97.inc"     ; AC'97 constants

include "pci.inc"     ; PCI interface

include "codec.inc"	; functions for configuring codec

include "frontend.inc"	   ; main window

;---------------------------------------------------------------------

;  Uncomment these strings if you don't want to receive debug messages:

;  macro dps str   {}    ; dps prints a string without CRLF

;  macro dpd num   {}    ; prints unsigned decimal number

;  macro pregs     {}    ; outputs EAX, EBX, ECX, EDX

;  macro newline   {}    ; CRLF

;  macro print str {}    ; output a string with CRLF

;  macro dph arg   {}    ; print hex number

;---------------------------------------------------------------------

;macro device id, addr { dd id, addr }

macro devices [id, str]

{

  common

    label supported_devices dword

  forward

    local string

    dd id

    dd string

  forward

    string db str

    db 0

}

devices \

  (ICH_DID shl 16) + INTEL_VID,      "ICH"    ,\

  (ICH0_DID shl 16) + INTEL_VID,     "ICH0"   ,\

  (ICH2_DID shl 16) + INTEL_VID,     "ICH2"   ,\

  (ICH3_DID shl 16) + INTEL_VID,     "ICH2"   ,\

  (ICH4_DID shl 16) + INTEL_VID,     "ICH4"   ,\

  (ICH5_DID shl 16) + INTEL_VID,     "ICH5"   ,\

  (MX440_DID shl 16) + INTEL_VID,    "440MX"  ,\

  (SI7012_DID shl 16) + SIS_VID,     "SI7012" ,\

  (NFORCE_DID shl 16) + NVIDIA_VID,  "NForce" ,\

  (NFORCE2_DID shl 16) + NVIDIA_VID, "NForce2",\

  (AMD8111_DID shl 16) + AMD_VID,    "AMD8111",\

  (AMD768_DID shl 16) + AMD_VID,     "AMD768"

dd    0

;---------------------------------------------------------------------

;---  MAIN PROGRAM  --------------------------------------------------

;---------------------------------------------------------------------

START:

; Print PCI version (for example, 2.16)

;        mcall   MF_PCI, 0

;        mov     bl, al

;        movzx   eax, ah

;        dps    "PCI version: "

;        dpd     eax

;        movzx   eax, bl

;        dpd     eax

;        newline

; Check PCI access mechanism (must be 1 or 2)

    mcall    MF_PCI, 2

    dec    al

    cmp    al, 1

    jna    @f

    print    "Error: cannot access PCI bus."

    jmp    exit

;        dps     "PCI returned "

;        movzx   eax, al

;        dpd     eax

;        newline

     @@:

; Get last bus & then check all buses & devices

    mcall    MF_PCI, 1

    mov    [lastbus], al

     ; looking for a compatible device

    mov    [bus], -1

  .next_bus:

    inc    [bus]

    mov    al, [lastbus]

    cmp    al, [bus]

    jb	  .device_not_found

    mov    [devfn], 0

  .next_devfn:

    mov    cl, 0

    call    pciRegRead32

    mov    edi, supported_devices

      @@:

    mov    ebx, [edi]

    test    ebx, ebx

    jz	  @f

    cmp    eax, ebx

    jnz    .skip

    add    edi, 4

    mov    [device_id], eax

    mov    edx, [edi]

    call    debug_outstr

    jmp    proceed

       .skip:

    add    edi, 8

    jmp    @b

      @@:

    inc    [devfn]

    cmp    [devfn], 255

    jb	  .next_devfn

    jmp    .next_bus

  .device_not_found:

    print    "Could not find Intel AC'97 compatible codec!"

    print    "1) Check if it's enabled in BIOS."

    print    "2) Check if your device is included in the device list."

    jmp    exit

 proceed:

    print    " integrated AC97 audio codec detected."

    mov    eax, [device_id]

    cmp    eax, (ICH4_DID shl 16) + INTEL_VID

    je	  .newich

    cmp    eax, (ICH5_DID shl 16) + INTEL_VID

    jne    .nonewich

      .newich:

    mov    [AC97ICH4], 1

      .nonewich:

    cmp    eax, (SI7012_DID shl 16) + SIS_VID

    jne    @f

    mov    [SI7012], 1

      @@:

;---------------------------------------------------------------------

; Get NAMBAR register base port address & save it

    mov    cl, NAMBAR_REG

    call    pciRegRead16

    and    eax, 0xFFFE

    mov    [NAMBAR], ax

    test    eax, eax

    jnz    .mixer_base_ok

    print    "Error: Intel ICH based AC97 audio codec disabled in BIOS!"

    jmp    exit

 .mixer_base_ok:

    dps    "NAMBAR: "

    dph    eax

; Get NABMBAR & save it

    mov    cl, NABMBAR_REG

    call    pciRegRead16

    and    eax, 0xFFC0

    mov    [NABMBAR], ax

    test    eax, eax

    jnz    .bm_base_ok

    print    "Error: Intel ICH based AC97 audio codec disabled in BIOS!"

    jmp    exit

 .bm_base_ok:

    dps    " NABMBAR: "

    dph    eax

    newline

;---------------------------------------------------------------------

; Get IRQ (not used)

    mov    cl, IRQ_REG

    call    pciRegRead8

    mov    [AC97IRQ], al

; Get Interrupt pin (not used)

    mov    cl, INT_REG

    call    pciRegRead8

    mov    [AC97INT], al

; AC97ICH4 should work then...

    cmp    [AC97ICH4], 1

    jne    .skip_ich4_init

    mov    cl, ICH4_CFG_REG  ; 0x41

    call    pciRegRead8

    or	  al, 0x1

    mov    dl, al

    call    pciRegWrite8

    mov    cl, 0x54

    call    pciRegRead16

    and    eax, 0xFFFF

    dps    "Power Control & Status: "

    dph    eax

    newline

 .skip_ich4_init:

;---------------------------------------------------------------------

    mov    cl, PCI_CMD_REG

    call    pciRegRead16	   ; read PCI command register

    mov    dx, ax

    or	  dx, IO_ENA+BM_ENA+BIT10    ; enable IO and bus master + disable

		       ;  interrupts

    call    pciRegWrite16

;---------------------------------------------------------------------

    print    "Enabling access to ports..."

    movzx    ecx, [NAMBAR]

    mov    edx, ecx

    add    edx, NAM_SIZE

    mcall    MF_PORTS, PRT_RESERVE

    test    eax, eax

    jz	  @f

    print    "Error: couldn't enable access to ports"

    jmp    exit

     @@:

    movzx    ecx, [NABMBAR]

    mov    edx, ecx

    add    edx, NABM_SIZE

    mcall    MF_PORTS, PRT_RESERVE

    test    eax, eax

    jz	  @f

    print    "Error: couldn't enable access to ports"

    jmp    exit

     @@:

;---------------------------------------------------------------------

; setup the Codec

    mov    eax, 48000

    call    codecConfig 	 ; unmute codec, set rates.

    test    eax, eax

    jnz    @f

    print    "Error: cannot initialize AC97 device."

    jmp    fpexit

       @@:

    print    "Congrutalations! Your device has been initialized properly!"

    call    print_info

;---------------------------------------------------------------------

; register reset the DMA engine.

    mov    edx, PO_CR_REG    ; PCM out control register

    mov    al, RR	 ; reset

    call    NABMBAR_write_byte

;start fix for MM (1)

    mcall  MF_INTERNAL_SERVICES,ALLOC_PHYS_MEM,120*1024

    test   eax,eax

    jz     no_phys_buffers             ;not enough memory

    mov    [phys_wav_buffer1],eax

    add    eax,60*1024

    mov    [phys_wav_buffer2],eax

    mcall  MF_INTERNAL_SERVICES,ALLOC_PHYS_MEM,32*8

    test   eax,eax

    jnz    @f

    mcall  MF_INTERNAL_SERVICES,FREE_PHYS_MEM,[phys_wav_buffer1]

    jmp    no_phys_buffers

@@:

    mov    [phys_bdl_buffer],eax

;end fix for MM (1)

; create Buffer Descriptors List

    call    prepare_BDL

; open player's window

    mcall    MF_THREAD, THR_CREATE, thread, thread_stack

; wait for command

  .new_check:

    cmp    [status], ST_PLAY

    jne    @f

    call    play

      @@:

    cmp    [status], ST_STOP

    jne    @f

    call    stop

      @@:

    cmp    [status], ST_EXIT

    je	  stopexit

    mcall    MF_DELAY, 10

    jmp    .new_check

stopexit:

    call    stop

fpexit:

; free ports

    movzx    ecx, [NAMBAR]

    mov    edx, ecx

    add    edx, NAM_SIZE

    mcall    MF_PORTS, PRT_FREE

    movzx    ecx, [NABMBAR]

    mov    edx, ecx

    add    edx, NABM_SIZE

    mcall    MF_PORTS, PRT_FREE

;---------------------------------------------------------------------

;start fix for MM (2)

    mcall  MF_INTERNAL_SERVICES,FREE_PHYS_MEM,[phys_bdl_buffer]

    mcall  MF_INTERNAL_SERVICES,FREE_PHYS_MEM,[phys_wav_buffer1]

;end fix for MM (2)

exit:

    mcall    MF_EXIT

no_phys_buffers:

    print  "allocation of physical buffers failed"

    jmp    exit

;---------------------------------------------------------------------

;---  FUNCTIONS  -----------------------------------------------------

;---------------------------------------------------------------------

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; prepare_BDL - initializes BUFFER DESCRIPTORS LIST

prepare_BDL:

    mov    ecx, 32 / 2	  ; make 32 entries in BDL

    mov    edi, BDL_BUFFER

;    call   get_my_address

    mov    ebx, 30*1024

    cmp    [SI7012], 1

    jne    @f

    add    ebx, ebx

@@:

    ; set buf. desc. 0 to start of data file in memory

    push   eax

;    add    eax, WAV_BUFFER1

;start fix for MM (6)

    mov    eax,[phys_wav_buffer1]

;end fix for MM (6)

    stosd

    ; set length to 60k samples. 1 sample is 16 bit or 2 bytes.

    mov    eax, ebx ;60*1024   ; number of samples

    or	   eax, BUP

    stosd

    mov    eax, [esp]

;    add    eax, WAV_BUFFER2

;start fix for MM (7)

    mov    eax,[phys_wav_buffer2]

;end fix for MM (7)

    stosd

    mov    eax, ebx ;60*1024

    or	   eax, BUP

    stosd

    pop    eax

    loop   @b

    ; tell the DMA engine where to find our list of Buffer Descriptors.

    ; eax = base addr!

;start fix for MM (3)

  ;copy to physical memory

    mcall  MF_INTERNAL_SERVICES,SET_PHYS_BUFFER,[phys_bdl_buffer],BDL_BUFFER,32*8

  ;physical address of bdl

    mov    eax,[phys_bdl_buffer]

;end fix for MM (3)

    mov    edx, PO_BDBAR_REG

;    add    eax, BDL_BUFFER

    call   NABMBAR_write_dword

ret

;---------------------------------------------------------------------

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; stop - stops current music

;; in:  nothing

;; out: nothing

stop:

;        print   "STOP!"

    push    eax edx

    mcall    MF_DELAY, 10

    mov    edx, PO_CR_REG

    mov    al, 0

    call    NABMBAR_write_byte

    cmp    [status], ST_STOP

    jne    .exit

    mov    [status], ST_DONE

      .exit:

    pop    edx eax

ret

;---------------------------------------------------------------------

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; play - plays wav file!

;; in:  nothing

;; out: nothing (but sound :)   !corrupts registers!

play:

    ; at first, reset file and get file size

        mcall   MF_SYSTREE, attrinfo

        test    eax, eax

        jnz     .notfound

        mov     eax, [fileattr+32]

        mov     [file_size], eax

    mov    [fileinfo.first_byte], 0

    mcall    MF_SYSTREE, fileinfo ; load a block, returns error code in eax

		     ;   and size of the file in ebx

    test    eax, eax	     ; 0 - successful

    jz	  @f

        cmp     eax, 6          ; 6 = eof - successful too

        jz      @f

.notfound:

    print    "AC97: File not found!"

    mov    [status], ST_STOP

    jmp    .exit

     @@:

    mov    al, [LOAD_BUFFER+32] ; bytes per sample

    dec    al

    jz	  @f

    cmp    al, 3

    je	  @f

    sub    al, [LOAD_BUFFER+22] ; channels

    add    al, 2

      @@:

    mov    [wav_mode], al

    pusha

    movzx    ebx,word [LOAD_BUFFER+24]

    mov   eax,48000

    xor   edx,edx

    div   ebx

    mov   [difference_of_frequency],al

;        dph   eax

    mov   ecx,edx

    imul  eax,ecx,10

    xor   edx,edx

    div   ebx

    mov   ecx,edx

    imul  ecx,10

    push  eax

    mov   eax,ecx

    xor   edx,edx

    div   ebx

;        dph   eax

    cmp   eax,5

    jl	  .temp_15

    pop   eax

;        dph   eax

    inc   eax

    jmp   .temp_16

     .temp_15:

    pop   eax

     .temp_16:

    mov   [difference_of_frequency_1],al

;        dph   eax

    xor   edx,edx

    movzx  ebx,[difference_of_frequency]

    imul   ebx,10

    add    bl,[difference_of_frequency_1]

    mov   [difference_of_frequency_2],bl

;        dph   ebx

    popa

    movzx    eax, word [LOAD_BUFFER+24]

    ;dps "Freq: "

    ;dpd eax

    ;newline

    call    set_sample_rate

    ; change the last_valid_index to the (current_index-1)

    ; the LVI register tells the DMA engine where to stop playing

    call    updateLVI

    ; if current index is odd, load buffer 1 then 0, jump to tuneLoop

    ; if it is even, buffers 0 then 1; tuneLoop1

    call    getCurrentIndex

    and    eax, BIT0

    mov    esi, eax

    push    eax

    call    update_next_buffer

    pop    eax

    xor    eax, 1

    call    update_next_buffer

    ; start playing!

    mov    edx, PO_CR_REG

    mov    al, RPBM

    call    NABMBAR_write_byte

    jmp    [jumpto+esi*4]

   .tuneLoop:

    ; wait while the current_index is even

    @@:

;        dps     "a"

    mcall    MF_DELAY, 7

    call    getCurrentIndex

    test    al, BIT0

    jz	  @b	   ; loop if not ready yet

;        print   "fa"

    call    updateLVI

    mov    eax, 0

    call    update_next_buffer

    test    al, al

    jnz    .exit_wait

    cmp    [status], ST_PLAY

    jne    .exit

    test    [volume], 0x10000000 ; test volume_changed bit

    je	  @f

    mov    al, byte [volume]

    call    setVolume

    and    [volume], 0x0FFFFFFF ; clear vloume_changed bit

     @@:

     .tuneLoop1:

     @@:

;        dps     "b"

    mcall    MF_DELAY, 7

    call    getCurrentIndex

    test    al, BIT0

    jnz    @b	    ; loop if not ready yet

;        print   "fb"

    cmp    [status], ST_PLAY

    jne    .exit

    call    updateLVI

    mov    eax, 1

    call    update_next_buffer

    test    al, al

    jnz    .exit_wait

    jmp    .tuneLoop

   .exit_wait:

    mcall    MF_DELAY, 30 ; a little pause - let the player finish

   .exit:

ret

attempts db 0

buffers dd WAV_BUFFER1, WAV_BUFFER2

jumpto	  dd play.tuneLoop, play.tuneLoop1

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; update_first_buffer - load a chunk into the first buffer, increments offset

;; in:  eax = number - 0 or 1

;; out: error code, 0 - successful

update_next_buffer:

    push   esi edi

    movzx  edx, byte [wav_mode]

    mov    ecx, [blocks + edx * 4]

    mov    [fileinfo.bytes], ecx

    mov    esi, LOAD_BUFFER

    mov    edi, [buffers+eax*4]

    push   eax              ;save buffer index

  start_attempts:

    mcall  MF_SYSTREE, fileinfo

    test eax, eax

    jz @f

        cmp     eax, 6

        jz      @f

    cmp   [attempts],100

    je	 @f

    inc   [attempts]

    jmp   start_attempts

;    dpd eax

;    newline

;    dpd [fileinfo.first_block]

;    newline

       @@:

;        print  " loaded!"

    push   eax ebx edx

    mov    eax,ecx

    xor    edx,edx

    imul   eax,10

    movzx     ebx,[difference_of_frequency_2]

    div    ebx

    mov    ecx,eax

;    mov   ebx,10

;    mov   eax,edx

;    xor   edx,edx

;    div   ebx

;   cmp   edx,5

;    jb   temp_12_7

;    inc   ecx

;  temp_12_7:

   cmp	 edx,0

    je	 temp_12_7

    inc   ecx

  temp_12_7:

    pop    edx ebx

    mov    eax,[esp+4]            ;restore buffer index

    add    [fileinfo.first_byte], ecx ; +60Kb

    call   [convert + edx * 4]

;start fix for MM (4)

    mov    eax,[esp+4]            ;restore buffer index

    test   eax,not 1

    jz     .ok

    print  "buffer index out of range"

    dpd    eax

    jmp    .ret

  .ok:

    push   ebp

    mov    ebp,[phys_wav_buffer1+eax*4]

    mov    edi,[buffers+eax*4]

    mcall  MF_INTERNAL_SERVICES,SET_PHYS_BUFFER,ebp,edi,60*1024

    pop    ebp

.ret:

    pop    eax

    add    esp,4                  ;pop buffer index

;end fix for MM (4)

    pop    edi esi

ret

c8mono:

    mov   [type_of_conversion],1

    jmp   for_all_type

c8mono_1:

    lodsb

    call  c8mono_2

    push  ax

    shl   eax,16

    pop   ax

    push  eax

    mov al,[esi]

    call  c8mono_2

    push  ax

    shl   eax,16

    pop   ax

    mov  ebx,eax

    pop  eax

    jmp  for_all_type_1

c8mono_2:

    sub    al, 0x80

    cbw

    imul   ax, 255

    ret

c8stereo:

    mov   [type_of_conversion],2

    jmp   for_all_type

c8stereo_1:

    lodsb

    call  c8stereo_2

    shl eax,16

    lodsb

    call  c8stereo_2

    push  eax

    mov al,[esi]

    call  c8stereo_2

    shl eax,16

    mov al,[esi+1]

    call  c8stereo_2

    mov   ebx,eax

    pop  eax

    jmp   for_all_type_1

c8stereo_2:

    sub    al, 0x80

    cbw

    imul   ax, 255

    ret

c16mono:

    mov   [type_of_conversion],3

    jmp   for_all_type

c16mono_1:

	lodsw

	push  ax

	shl eax,16

	pop   ax

	mov bx,[esi]

	shl ebx,16

	mov bx,[esi]

	jmp  for_all_type_1

c16stereo:

 for_all_type:

    xor   edx,edx

    mov    eax, 15*1024*10

    movzx     ebx,[difference_of_frequency_2]

    xor    edx,edx

    div    ebx

    mov    ecx,eax

;    mov   ebx,10

;    mov   eax,edx

;    xor   edx,edx

;    div   ebx

;    cmp   edx,5

;    jb   temp_12_6

;    inc   ecx

;  temp_12_6:

   cmp	 edx,0

    je	 temp_12_6

    inc   ecx

  temp_12_6:

  c16stereo_1:

    mov  [znak],0

    cmp  [type_of_conversion],1

    je	 c8mono_1

    cmp  [type_of_conversion],2

    je	 c8stereo_1

    cmp  [type_of_conversion],3

    je	 c16mono_1

    lodsd

    mov ebx,[esi]

for_all_type_1:

    cmp eax,ebx

    jne  c16stereo_2

    inc  [znak]

    c16stereo_2:

    push eax

    push ecx

    sub  eax,ebx

    push eax

    shl  eax,16

    movzx  ebx,[difference_of_frequency]

    inc   ebx

    xor  edx,edx

    div  ebx

    shr  eax,16

    mov  ecx,eax

    pop  eax

    xor  ax,ax

    xor  edx,edx

    div  ebx

    shl  eax,16

    mov  cx,ax

    mov  ebx,ecx

    pop  ecx

    pop   eax

    mov    dl,[difference_of_frequency]

    inc   dl

    @@:

temp_12:

    cmp   [difference_of_frequency_1],0

    je	  temp_12_3

    cmp   [difference_of_frequency_1],5

    jne   temp_12_4

    cmp  [difference_of_frequency_4],2

    jne  temp_12_3

    jmp  temp_12_5

 temp_12_4:

    cmp  [difference_of_frequency_4],10

    jne  temp_12_3

 temp_12_5:

    cmp  [znak],0

    jne   temp_12_5_1

    sub  eax,ebx

    jmp  temp_12_5_2

 temp_12_5_1:

    add  eax,ebx

 temp_12_5_2:

    stosd

    inc  [schetchik]

    mov    [difference_of_frequency_4],0

 temp_12_3:

    cmp  [znak],0

    jne   temp_13

    sub  eax,ebx

    jmp  temp_14

 temp_13:

    add  eax,ebx

 temp_14:

    cld

    dec    dl

    jz	  temp_14_1

    stosd

    inc   [schetchik]

    inc   [difference_of_frequency_4]

    jmp   temp_12

 temp_14_1:

    dec    ecx

    cmp   ecx,0

;    jnz    c16stereo_1

    jg	  c16stereo_1

    newline

    dph [schetchik]

 temp_14_2:

    cmp   [schetchik],15360

    jge   temp_14_3

    stosd

    inc  [schetchik]

    jmp  temp_14_2

  temp_14_3:

    newline

    dph [schetchik]

    cmp   [schetchik],15360

    je	  temp_14_4

;    mov  [edi-4],dword 0

    sub   edi,4

;    sub   esi,4

 temp_14_4:

    mov   [schetchik],0

    ret

difference_of_frequency db 0

difference_of_frequency_1 db 0

difference_of_frequency_2 db 0

difference_of_frequency_4 db 0

schetchik dd 0

znak db 0

type_of_conversion db 0

convert dd c8mono, c8stereo, c16mono, c16stereo

blocks	  dd 30*512, 60*512, 60*512, 120*512

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; get_my_address - get base address of the program in physical memory

;;   in:  nothing

;;   out: eax = address

;start fix for MM (8)

;function shouldn't used.

;get_my_address:

;    pushad

;    mcall    MF_PROCINFO, procinfo, PN_MYSELF

;    popad

;    mov    eax, [procinfo.memory_start]

;ret

;end fix for MM (8)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; set the last valid index to something other than we're currently playing

;; so that we never end

;;

;; this routine just sets the last valid index to 1 less than the index

;; that we're currently playing, thus keeping it in and endless loop

;; input:  none

;; output: none

updateLVI:

    push    eax

    call    getCurrentIndex

     ; dps "index "

     ; dpd eax

     ; newline

    dec    al

    and    al, INDEX_MASK

    call    setLastValidIndex

    pop    eax

ret

;---------------------------------------------------------------------

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; returns AL = current index value

getCurrentIndex:

    push    edx

    mov    edx, PO_CIV_REG

    call    NABMBAR_read_byte

    pop    edx

ret

;---------------------------------------------------------------------

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; input AL = index # to stop on

setLastValidIndex:

    push    edx

    mov    edx, PO_LVI_REG

    call    NABMBAR_write_byte

    pop    edx

ret

;---------------------------------------------------------------------

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; print_info - outputs debug information

;;  in:  nothing

;;  out: nothing

print_info:

    dps    "BUS: "

    movzx    eax, [bus]

    dph    eax

    dps    " DEVFN: "

    movzx    eax, [devfn]

    dph    eax

    dps    " IRQ: "

    movzx    eax, [AC97IRQ]

    dpd    eax

    newline

    dps    "CODEC_POWER_CTRL: "

    mov    edx, CODEC_POWER_CTRL_REG

    call    NAMBAR_read_word

    dph    eax

    dps    " (bits 0-3 should be set)"

    newline

    mov    edx, 0x28

    call    NAMBAR_read_word

    dph    eax

    dps    " - supported features"

    newline

    mov    edx, 0x2A

    call    NAMBAR_read_word

    dph    eax

    dps    " - config"

    newline

    mov    edx, 0x2C

    call    NAMBAR_read_word

    dph    eax

    dps    " - PCM rate"

    newline

ret

;---------------------------------------------------------------------

;---  DATA OF PROGRAM  -----------------------------------------------

;---------------------------------------------------------------------

volume		 dd  15

attrinfo:

        dd      5

        dd      0

        dd      0

        dd      0

        dd      fileattr

        db      0

        dd      textbox_string

fileinfo:

 .mode          dd      0		 ; READ

 .first_byte    dd      0

                dd      0

 .bytes         dd      60*1024		 ; 60 Kb

 .dest		 dd  LOAD_BUFFER ;file_data

	 ;  db  "/HD/1/WINDOWS/MEDIA/WICEB7~1.WAV",0

;sz textbox_string, "/hd/1/testmuz/menuet11.wav",0

textbox_string:

;---------------------------------------------------------------------

IMAGE_END:		 ; end of program's image

   rb 257

;   rb 257-textbox_string.size

;     textbox_string.size

;---------------------------------------------------------------------

device_id dd ?	  ; (device_id << 16) + vendor_id

lastbus   db ?	  ; pci coordinates

bus	 db ?

devfn	   db ?

AC97ICH4  db ?	  ; Intel ICH4 codec flag

SI7012	    db ?    ; SiS SI7012 codec flag

NAMBAR	    dw ?    ; Audio Mixers Registers (base)

NABMBAR   dw ?	  ; Bus Master Registers   (base)

AC97IRQ   db ?	  ; Interrupt request

AC97INT   db ?	  ; Interrupt pin

wav_mode  db ?	  ; bits per sample & channels

;---------------------------------------------------------------------

ST_DONE = 0x0	 ; for interacting with player's window

ST_PLAY = 0x1

ST_EXIT = 0x2

ST_STOP = 0x4

status	    db ?

fileattr: rb 40

;---------------------------------------------------------------------

phys_bdl_buffer rd 1

phys_wav_buffer1 rd 1

phys_wav_buffer2 rd 1

align 32

; Buffer Descriptors List

;  ___________________________

;  |     physical address    | dword

;  |_________________________|

;  | attr       |   length   | dword     max. length = 65535 samples

;  |_________________________|

BDL_BUFFER:

 rb 32*8     ; 32 descriptors, 8 bytes each

;---------------------------------------------------------------------

file_data:

WAV_BUFFER1:

 rb 60 * 1024  ; 60 Kb

WAV_BUFFER2:

 rb 60 * 1024

LOAD_BUFFER:

 rb 60 * 1024

;---------------------------------------------------------------------

procinfo process_information

work_area:

 rb 0x10000

;---------------------------------------------------------------------

rb 0x800

thread_stack:

rb 0x1000 ; for stack

STACK_P:

MEMORY_END: