92 lines
2.4 KiB
NASM
92 lines
2.4 KiB
NASM
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.386
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.MODEL flat
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.data
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.code
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SEGMENT text USE32
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ALIGN 16
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;================
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;
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; MV_Mix8BitMonoFast
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;
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;================
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; eax - position
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; edx - rate
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; ecx - Volume table
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; ebx - Harsh clip table
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; edi - to
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; esi - start
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MixBufferSize equ 256
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PROC MV_Mix8BitMonoFast_
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PUBLIC MV_Mix8BitMonoFast_
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push ebp
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; mov edi,[to]
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; mov esi,[start]
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; mov ebp,[position]
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; mov edx,[Rate]
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mov ebp, eax
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; Rate scale ptr
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; mov edx,[rate]
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mov eax,OFFSET apatch1+2 ; convice tasm to modify code...
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mov [eax],edx
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; Volume table ptr
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; mov ecx,[VolumeTable]
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mov eax,OFFSET apatch2+3 ; convice tasm to modify code...
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mov [eax],ecx
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; Harsh Clip table ptr
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; mov ebx,HarshClipTable ; get harsh clip table address
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add ebx,128
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mov eax,OFFSET apatch3+3 ; convice tasm to modify code...
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mov [eax],ebx
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mov ecx, MixBufferSize
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; eax - scratch
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; ebx - scratch
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; edx - scratch
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; ecx - count
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; edi - destination
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; esi - source
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; ebp - frac pointer
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; apatch1 - volume table
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; apatch2 - volume table
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; apatch3 - harsh clip table
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; apatch4 - harsh clip table
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; apatch5 - sample rate
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; apatch6 - sample rate
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ALIGN 16
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mix8Mloop:
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mov eax,ebp ; begin calculating first sample
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apatch1:
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add ebp,12345678h ; advance frac pointer
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shr eax,16 ; finish calculation for first sample
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movzx eax, byte ptr [esi+eax] ; get first sample
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movzx edx, byte ptr [edi] ; get current sample from destination
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apatch2:
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movsx eax, byte ptr [eax+12345678h] ; volume translate first sample
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apatch3:
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mov eax, [eax + edx + 12345678h] ; harsh clip new sample
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mov [edi], al ; write new sample to destination
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inc edi ; move destination to second sample
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dec ecx ; decrement count
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jnz mix8Mloop ; loop
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pop ebp
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ret
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ENDP
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ENDS
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END
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