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SoundCapture.asm
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SoundCapture.asm
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; POKE 23736,181 : No keypress on SAVE
Init_Capture PROTO
Close_Capture PROTO
Init_Capture_Fail PROTO :DWORD
Resync_Capture PROTO
Get_Real_Tape_Bit PROTO
NUM_CAPTURE_BUFFERS equ 30
CAPTURE_BUFFER_LEN equ 1764 * 2
CAPTURE_BUFFER_SIZE equ NUM_CAPTURE_BUFFERS * CAPTURE_BUFFER_LEN
.data?
cap_hWaveIn HANDLE ?
cap_WaveHdrs BYTE NUM_CAPTURE_BUFFERS * sizeof WAVEHDR dup (?)
cap_buffers BYTE NUM_CAPTURE_BUFFERS * CAPTURE_BUFFER_LEN dup (?)
cap_writeposn DWORD ?
cap_readposn DWORD ?
.code
Flip_RealTape_Mode proc
.if RealTapeMode == FALSE
invoke Init_Capture
.else
invoke Close_Capture
.endif
ret
Flip_RealTape_Mode endp
Init_Capture proc uses esi edi ebx
assume esi: ptr WAVEFORMATEX
lea esi, WaveFormat
mov [esi].wFormatTag, WAVE_FORMAT_PCM
mov [esi].nChannels, 2
mov [esi].nSamplesPerSec, 44100
mov [esi].nAvgBytesPerSec, 44100
mov [esi].nBlockAlign, (8*2)/8
mov [esi].wBitsPerSample, 8
mov [esi].cbSize, 0
assume esi: nothing
invoke waveInOpen, addr cap_hWaveIn, WAVE_MAPPER, addr WaveFormat, hWnd, 0, CALLBACK_WINDOW
.if eax == MMSYSERR_NOERROR
lea edi, cap_WaveHdrs
assume edi: PTR WAVEHDR
lea esi, cap_buffers
xor ebx, ebx
.while ebx < NUM_CAPTURE_BUFFERS
mov [edi].lpData, esi
mov [edi].dwBufferLength, CAPTURE_BUFFER_LEN
mov [edi].dwBytesRecorded, 0
mov [edi].dwUser, ebx
mov [edi].dwFlags, 0
mov [edi].dwLoops, 0
invoke waveInPrepareHeader, cap_hWaveIn, edi, sizeof WAVEHDR
.break .if eax != MMSYSERR_NOERROR
invoke waveInAddBuffer, cap_hWaveIn, edi, sizeof WAVEHDR
.break .if eax != MMSYSERR_NOERROR
add esi, CAPTURE_BUFFER_LEN
add edi, sizeof WAVEHDR
inc ebx
.endw
assume edi: nothing
ifc ebx ne NUM_CAPTURE_BUFFERS then invoke Init_Capture_Fail, eax : ret ; error if not all buffers prepared/added
invoke waveInStart, cap_hWaveIn
ifc eax ne MMSYSERR_NOERROR then invoke Init_Capture_Fail, eax : ret
mov cap_writeposn, 0
mov cap_readposn, (NUM_CAPTURE_BUFFERS / 2) * CAPTURE_BUFFER_LEN
mov RealTapeMode, TRUE
.else
invoke Init_Capture_Fail, eax
.endif
ret
Init_Capture endp
Init_Capture_Fail proc ErrorNum: DWORD
local ErrorText[MAXERRORLENGTH+32]: BYTE
invoke Close_Capture
invoke waveInGetErrorText, ErrorNum, addr ErrorText, sizeof ErrorText
.if eax == MMSYSERR_NOERROR
invoke ShowMessageBox, hWnd, addr ErrorText, addr szWindowName, MB_OK or MB_ICONERROR
.else
invoke ShowMessageBox, hWnd, SADD ("Unknown error opening recording device"), addr szWindowName, MB_OK or MB_ICONERROR
.endif
ret
Init_Capture_Fail endp
Close_Capture proc uses esi edi ebx
.if cap_hWaveIn != NULL
invoke waveInStop, cap_hWaveIn
invoke waveInReset, cap_hWaveIn
lea edi, cap_WaveHdrs
assume edi: PTR WAVEHDR
lea esi, cap_buffers
xor ebx, ebx
.while ebx < NUM_CAPTURE_BUFFERS
mov [edi].lpData, esi
mov [edi].dwBufferLength, CAPTURE_BUFFER_LEN
mov [edi].dwBytesRecorded, 0
mov [edi].dwUser, ebx
mov [edi].dwFlags, 0
mov [edi].dwLoops, 0
invoke waveInUnprepareHeader, cap_hWaveIn, edi, sizeof WAVEHDR
add esi, CAPTURE_BUFFER_LEN
add edi, sizeof WAVEHDR
inc ebx
.endw
assume edi: nothing
invoke waveInClose, cap_hWaveIn
mov cap_hWaveIn, NULL
.endif
mov RealTapeMode, FALSE
ret
Close_Capture endp
Resync_Capture proc
.if RealTapeMode == TRUE
mov eax, cap_writeposn
add eax, (NUM_CAPTURE_BUFFERS / 2) * CAPTURE_BUFFER_LEN
.if eax >= CAPTURE_BUFFER_SIZE
sub eax, CAPTURE_BUFFER_SIZE
.endif
mov cap_readposn, eax
.endif
ret
Resync_Capture endp
Get_Real_Tape_Bit proc uses esi
; adjust CyclesPerSample for the next sample period
mov cl, MACHINE.REALTAPEPERIOD.CyclesPerSample
mov al, MACHINE.REALTAPEPERIOD.SampleLoopCount
add al, 1
.if al == MACHINE.REALTAPEPERIOD.SampleLoopAdjustRate
add cl, MACHINE.REALTAPEPERIOD.SampleLoopAdjustValue
xor al, al
.endif
mov MACHINE.REALTAPEPERIOD.SampleLoopCount, al
mov MACHINE.REALTAPEPERIOD.CurrentCyclesPerSample, cl
mov esi, cap_readposn
mov al, [cap_buffers+esi] ; take left channel sample
add esi, 2
.if al > 128
mov EarBit, 64
mov EarVal, EarHighVal
.else
mov EarBit, 0
mov EarVal, EarLowVal
.endif
.if esi >= CAPTURE_BUFFER_SIZE
sub esi, CAPTURE_BUFFER_SIZE
.endif
mov cap_readposn, esi
ret
Get_Real_Tape_Bit endp