Sample Code
Windows Driver Samples/ DirectMusic Software Synthesizer Sample/ C++/ mix.cpp/
//
// Copyright (c) 1996-2000 Microsoft Corporation. All rights reserved.
// Mix.cpp
// Mix engines for MSSynth
#include "common.h"
#define STR_MODULENAME "DDKSynth.sys:Mix: "
#pragma warning(disable : 4101 4102 4146)
#pragma code_seg()
/*****************************************************************************
* CDigitalAudio::Mix8()
*****************************************************************************
* Implement a stereo eight-bit mix.
* Heavily optimized for x86 non-MMX, plus C code for non-x86.
*/
DWORD CDigitalAudio::Mix8(short * pBuffer, DWORD dwLength,
DWORD dwDeltaPeriod, VFRACT vfDeltaLVolume,
VFRACT vfDeltaRVolume,PFRACT pfDeltaPitch,
PFRACT pfSampleLength,PFRACT pfLoopLength)
{
DWORD dwI;
DWORD dwPosition;
long lM, lLM;
DWORD dwIncDelta = dwDeltaPeriod;
VFRACT dwFract;
char * pcWave = (char *) m_pnWave;
PFRACT pfSamplePos = m_pfLastSample;
VFRACT vfLVolume = m_vfLastLVolume;
VFRACT vfRVolume = m_vfLastRVolume;
PFRACT pfPitch = m_pfLastPitch;
PFRACT pfPFract = pfPitch << 8;
VFRACT vfLVFract = vfLVolume << 8; // Keep high res version around.
VFRACT vfRVFract = vfRVolume << 8;
dwLength <<= 1;
#ifndef _X86_
UNREFERENCED_PARAMETER(pBuffer);
for (dwI = 0; dwI < dwLength; )
{
if (pfSamplePos >= pfSampleLength)
{
if (pfLoopLength)
pfSamplePos -= pfLoopLength;
else
break;
}
dwIncDelta--;
if (!dwIncDelta)
{
dwIncDelta = dwDeltaPeriod;
pfPFract += pfDeltaPitch;
pfPitch = pfPFract >> 8;
vfLVFract += vfDeltaLVolume;
vfLVolume = vfLVFract >> 8;
vfRVFract += vfDeltaRVolume;
vfRVolume = vfRVFract >> 8;
}
dwPosition = pfSamplePos >> 12;
dwFract = pfSamplePos & 0xFFF;
pfSamplePos += pfPitch;
lLM = pcWave[dwPosition];
lM = ((pcWave[dwPosition + 1] - lLM) * dwFract) >> 12;
lM += lLM;
lLM = lM;
lLM *= vfLVolume;
lLM >>= 5; // Signal bumps up to 15 bits.
lM *= vfRVolume;
lM >>= 5;
#ifndef _X86_
#else // _X86_ (dead code)
// Keep this around so we can use it to generate new assembly code (see below...)
pBuffer[dwI] += (short) lLM;
_asm{jno no_oflowl}
pBuffer[dwI] = 0x7fff;
_asm{js no_oflowl}
pBuffer[dwI] = (short) 0x8000;
no_oflowl:
pBuffer[dwI+1] += (short) lM;
_asm{jno no_oflowr}
pBuffer[dwI+1] = 0x7fff;
_asm{js no_oflowr}
pBuffer[dwI+1] = (short) 0x8000;
no_oflowr:
#endif // _X86_ (dead code)
dwI += 2;
}
#else // _X86_
int i, a, b, c, total;
short * pBuf = pBuffer + dwLength, *pBufX;
dwI = - dwLength;
_asm {
; 979 : for (dwI = 0; dwI < dwLength; )
// Induction variables.
mov edi, dwI
mov ebx, DWORD PTR pfSamplePos
// Previously set up.
cmp DWORD PTR dwLength, 0
mov edx, pfPFract
mov ecx, DWORD PTR pfPitch
je $L30539
$L30536:
cmp ebx, DWORD PTR pfSampleLength
; 981 : if (pfSamplePos >= pfSampleLength)
mov esi, DWORD PTR dwIncDelta
jge SHORT $L30540_
$L30540:
; 987 : else
; 988 : break;
; 990 : dwIncDelta--;
dec esi
mov DWORD PTR dwIncDelta, esi
; 991 : if (!dwIncDelta)
je SHORT $L30541_
$L30541:
// esi, edx, edi esi == dwIncDelta
mov DWORD PTR i, 0
; 1010 : b = dwIncDelta;
// esi = b == dwIncDelta
; 1011 : c = (pfSampleLength - pfSamplePos) / pfPitch;
; 1009 : a = (dwLength - dwI) / 2; // Remaining span.
mov edx, edi
neg edx
shr edx, 1 // edx = a
; 1017 : if (b < a && b < c)
cmp esi, edx
jge try_ax
mov eax, ecx
imul eax, esi
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1019 : i = b;
cmp esi, 3
jl got_it
mov DWORD PTR i, esi
jmp SHORT got_it
; 1013 : if (a < b && a < c)
try_a:
cmp edx, esi
jge try_c
try_ax:
mov eax, edx
imul eax, ecx
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1015 : i = a;
cmp edx, 3
jl got_it
mov DWORD PTR i, edx
jmp SHORT got_it
; 1021 : else if (c < a && c < b)
try_c:
push edx
mov eax, DWORD PTR pfSampleLength
sub eax, ebx
cdq
idiv ecx // eax == c
pop edx
cmp eax, edx
jge got_it
try_cx:
cmp eax, esi
jge got_it
; 1023 : i = c;
cmp eax, 3
jl $L30543
mov DWORD PTR i, eax
got_it:
mov edx, DWORD PTR i
mov eax, DWORD PTR pBuf
dec edx
jl $L30543
sub DWORD PTR dwIncDelta, edx
; 1093 : return (dwI >> 1);
; 1094 : }
lea edx, [edx*2+2] // Current span.
lea eax, [eax+edi*2] // Starting position.
add edi, edx // Remaining span.
lea eax, [eax+edx*2] // New ending position.
push edi
mov edi, edx // Current span.
mov DWORD PTR pBufX, eax
neg edi
$L30797:
; 1005 : do
; 1010 : dwPosition = pfSamplePos >> 12;
; 1011 : dwFract = pfSamplePos & 0xFFF;
mov edx, ebx
mov esi, ebx
add ebx, ecx
mov ecx, DWORD PTR pcWave
; 1012 : pfSamplePos += pfPitch;
sar edx, 12 ; 0000000cH
and esi, 4095 ; 00000fffH
; 1013 :
; 1014 : lLM = (long) pcWave[dwPosition];
movsx eax, BYTE PTR [ecx+edx]
; 1015 : lM = ((pcWave[dwPosition+1] - lLM) * dwFract);
; 1016 : lM >>= 12;
; 1017 : lM += lLM;
movsx edx, BYTE PTR [ecx+edx+1]
; 1018 : lLM = lM;
; 1019 : lLM *= vfLVolume;
; 1020 : lLM >>= 5; // Signal bumps up to 15 bits.
; 1022 : pBuffer[dwI] += (short) lLM;
; 1028 : lM *= vfRVolume;
; 1029 : lM >>= 5;
; 1030 : pBuffer[dwI+1] += (short) lM;
; 1036 :
; 1037 : dwI += 2;
sub edx, eax
imul edx, esi
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfLVolume
add edx, eax
imul esi, edx
sar esi, 5 ; 00000005H
mov eax, DWORD PTR pBufX
add WORD PTR [eax+edi*2], si
mov esi, DWORD PTR vfRVolume
jo overflow_lx
no_oflowlx:
imul esi, edx
; 1038 : } while (--dwIncDelta);
sar esi, 5 ; 00000005H
mov ecx, DWORD PTR pfPitch
add WORD PTR [eax+edi*2+2], si
jo overflow_rx
no_oflowrx:
add edi, 2
jne SHORT $L30797
pop edi
; 1039 : ++dwIncDelta;
; 1040 : continue;
mov edx, DWORD PTR pfPFract
cmp edi, 0
jl SHORT $L30536
jmp SHORT $L30539
$L30540_:
; 982 : {
; 983 : if (pfLoopLength)
cmp DWORD PTR pfLoopLength, 0
je $L30539
; 984 : {
; 985 : pfSamplePos -= pfLoopLength;
sub ebx, DWORD PTR pfLoopLength
jmp $L30540
$L30541_:
; 994 : pfPFract += pfDeltaPitch;
mov ecx, DWORD PTR pfDeltaPitch
mov esi, DWORD PTR vfDeltaLVolume
add ecx, edx
mov edx, DWORD PTR vfLVFract
; 995 : pfPitch = pfPFract >> 8;
; 996 : vfLVFract += vfDeltaLVolume;
mov DWORD PTR pfPFract, ecx
add edx, esi
; 997 : vfLVolume = vfLVFract >> 8;
; 998 : vfRVFract += vfDeltaRVolume;
sar ecx, 8
mov DWORD PTR vfLVFract, edx
sar edx, 8
mov esi, DWORD PTR vfDeltaRVolume
mov DWORD PTR vfLVolume, edx
mov edx, DWORD PTR vfRVFract
add edx, esi
mov DWORD PTR pfPitch, ecx
mov DWORD PTR vfRVFract, edx
mov esi, DWORD PTR dwDeltaPeriod
; 999 : vfRVolume = vfRVFract >> 8;
sar edx, 8
mov DWORD PTR dwIncDelta, esi
; 993 : dwIncDelta = dwDeltaPeriod;
mov DWORD PTR vfRVolume, edx
jmp $L30541
// Handle truncation.
overflow_l:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflowl
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflowl
overflow_r:
mov WORD PTR [eax+edi*2+2], 0x7fff
js no_oflowr
mov WORD PTR [eax+edi*2+2], 0x8000
jmp no_oflowr
overflow_lx:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflowlx
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflowlx
overflow_rx:
mov WORD PTR [eax+edi*2+2], 0x7fff
js no_oflowrx
mov WORD PTR [eax+edi*2+2], 0x8000
jmp no_oflowrx
$L30543:
; 1041 : }
; 1044 : dwPosition = pfSamplePos >> 12;
mov edx, ebx
mov ecx, DWORD PTR pfPitch
; 1045 : dwFract = pfSamplePos & 0xFFF;
sar edx, 12 ; 0000000cH
mov esi, ebx
add ebx, ecx
and esi, 4095 ; 00000fffH
; 1046 : pfSamplePos += pfPitch;
mov ecx, DWORD PTR pcWave
; 1047 :
; 1048 : lLM = (long) pcWave[dwPosition];
movsx eax, BYTE PTR [ecx+edx]
; 1049 : lM = ((pcWave[dwPosition+1] - lLM) * dwFract);
; 1050 : lM >>= 12;
; 1051 : lM += lLM;
movsx edx, BYTE PTR [ecx+edx+1]
sub edx, eax
imul edx, esi
; 1052 : lLM = lM;
; 1053 : lLM *= vfLVolume;
; 1054 : lLM >>= 5; // Signal bumps up to 15 bits.
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfLVolume
add edx, eax
; 1072 : pBuffer[dwI] += (short) lLM;
imul esi, edx
sar esi, 5 ; 00000005H
mov eax, DWORD PTR pBuf
add WORD PTR [eax+edi*2], si
mov esi, DWORD PTR vfRVolume
jo overflow_l
no_oflowl:
; 1078 : lM *= vfRVolume;
; 1079 : lM >>= 5;
imul esi, edx
; 1080 : pBuffer[dwI+1] += (short) lM;
; 1085 : no_oflowr:
; 1087 : dwI += 2;
sar esi, 5 ; 00000005H
mov ecx, DWORD PTR pfPitch
add WORD PTR [eax+edi*2+2], si
mov edx, DWORD PTR pfPFract
jo overflow_r
no_oflowr:
; 978 :
; 979 : for (dwI = 0; dwI < dwLength; )
add edi, 2
jl $L30536
$L30539:
mov DWORD PTR dwI, edi
mov DWORD PTR pfSamplePos, ebx
}
dwI += dwLength;
#endif // _X86_
m_vfLastLVolume = vfLVolume;
m_vfLastRVolume = vfRVolume;
m_pfLastPitch = pfPitch;
m_pfLastSample = pfSamplePos;
return (dwI >> 1);
}
/*****************************************************************************
* CDigitalAudio::MixMono8()
*****************************************************************************
* Implement a mono eight-bit mix.
* Heavily optimized for x86 non-MMX, plus C code for non-x86.
*/
DWORD CDigitalAudio::MixMono8(short * pBuffer, DWORD dwLength,
DWORD dwDeltaPeriod,VFRACT vfDeltaVolume,
PFRACT pfDeltaPitch,PFRACT pfSampleLength,
PFRACT pfLoopLength)
{
DWORD dwI;
DWORD dwPosition;
long lM;
DWORD dwIncDelta = dwDeltaPeriod;
VFRACT dwFract;
char * pcWave = (char *) m_pnWave;
PFRACT pfSamplePos = m_pfLastSample;
VFRACT vfVolume = m_vfLastLVolume;
PFRACT pfPitch = m_pfLastPitch;
PFRACT pfPFract = pfPitch << 8;
VFRACT vfVFract = vfVolume << 8; // Keep high res version around.
#ifndef _X86_
UNREFERENCED_PARAMETER(pBuffer);
for (dwI = 0; dwI < dwLength; )
{
if (pfSamplePos >= pfSampleLength)
{
if (pfLoopLength)
pfSamplePos -= pfLoopLength;
else
break;
}
dwIncDelta--;
if (!dwIncDelta)
{
dwIncDelta = dwDeltaPeriod;
pfPFract += pfDeltaPitch;
pfPitch = pfPFract >> 8;
vfVFract += vfDeltaVolume;
vfVolume = vfVFract >> 8;
}
dwPosition = pfSamplePos >> 12;
dwFract = pfSamplePos & 0xFFF;
pfSamplePos += pfPitch;
lM = pcWave[dwPosition];
lM += ((pcWave[dwPosition + 1] - lM) * dwFract) >> 12;
lM *= vfVolume;
lM >>= 5;
#ifndef _X86_
#else // _X86_ (dead code)
// Keep this around so we can use it to generate new assembly code (see below...)
pBuffer[dwI] += (short) lM;
_asm{jno no_oflow}
pBuffer[dwI] = 0x7fff;
_asm{js no_oflow}
pBuffer[dwI] = (short) 0x8000;
no_oflow:
#endif // _X86_ (dead code)
dwI++;
}
#else // _X86_
int i, a, b, c, total;
short * pBuf = pBuffer + dwLength, *pBufX;
dwI = - dwLength;
_asm {
; 979 : for (dwI = 0; dwI < dwLength; )
// Induction variables.
mov edi, dwI
mov ebx, DWORD PTR pfSamplePos
// Previously set up.
cmp DWORD PTR dwLength, 0
mov edx, pfPFract
mov ecx, DWORD PTR pfPitch
je $L30539
$L30536:
cmp ebx, DWORD PTR pfSampleLength
; 981 : if (pfSamplePos >= pfSampleLength)
mov esi, DWORD PTR dwIncDelta
jge SHORT $L30540_
$L30540:
; 987 : else
; 988 : break;
; 990 : dwIncDelta--;
dec esi
mov DWORD PTR dwIncDelta, esi
; 991 : if (!dwIncDelta)
je SHORT $L30541_
$L30541:
// esi, edx, edi esi == dwIncDelta
mov DWORD PTR i, 0
; 1010 : b = dwIncDelta;
// esi = b == dwIncDelta
; 1011 : c = (pfSampleLength - pfSamplePos) / pfPitch;
; 1009 : a = dwLength - dwI; // Remaining span.
mov edx, edi
neg edx
; 1017 : if (b < a && b < c)
cmp esi, edx
jge try_ax
mov eax, ecx
imul eax, esi
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1019 : i = b;
cmp esi, 3
jl got_it
mov DWORD PTR i, esi
jmp SHORT got_it
; 1013 : if (a < b && a < c)
try_a:
cmp edx, esi
jge try_c
try_ax:
mov eax, edx
imul eax, ecx
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1015 : i = a;
cmp edx, 3
jl got_it
mov DWORD PTR i, edx
jmp SHORT got_it
; 1021 : else if (c < a && c < b)
try_c:
push edx
mov eax, DWORD PTR pfSampleLength
sub eax, ebx
cdq
idiv ecx // eax == c
pop edx
cmp eax, edx
jge got_it
try_cx:
cmp eax, esi
jge got_it
; 1023 : i = c;
cmp eax, 3
jl $L30543
mov DWORD PTR i, eax
got_it:
mov edx, DWORD PTR i
mov eax, DWORD PTR pBuf
dec edx
jl $L30543
sub DWORD PTR dwIncDelta, edx
; 1093 : return (dwI);
; 1094 : }
lea edx, [edx+1] // Current span.
lea eax, [eax+edi*2] // Starting position.
add edi, edx // Remaining span.
lea eax, [eax+edx*2] // New ending position.
push edi
mov edi, edx // Current span.
mov DWORD PTR pBufX, eax
neg edi
$L30797:
; 1005 : do
; 1010 : dwPosition = pfSamplePos >> 12;
; 1011 : dwFract = pfSamplePos & 0xFFF;
mov edx, ebx
mov esi, ebx
add ebx, ecx
mov ecx, DWORD PTR pcWave
; 1012 : pfSamplePos += pfPitch;
sar edx, 12 ; 0000000cH
and esi, 4095 ; 00000fffH
; 1013 :
; 1014 : lLM = (long) pcWave[dwPosition];
movsx eax, BYTE PTR [ecx+edx]
; 1015 : lM = ((pcWave[dwPosition+1] - lLM) * dwFract);
; 1016 : lM >>= 12;
; 1017 : lM += lLM;
movsx edx, BYTE PTR [ecx+edx+1]
sub edx, eax
; 1018 : lLM = lM;
; 1019 : lLM *= vfLVolume;
; 1020 : lLM >>= 5; // Signal bumps up to 15 bits.
; 1022 : pBuffer[dwI] += (short) lLM;
; 1027 : no_oflowx:
; 1037 : ++dwI;
imul edx, esi
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfVolume
mov ecx, DWORD PTR pfPitch
add edx, eax
imul esi, edx
sar esi, 5 ; 00000005H
mov eax, DWORD PTR pBufX
add WORD PTR [eax+edi*2], si
jo overflow_x
no_oflowx:
inc edi
jne SHORT $L30797
pop edi
; 1039 : ++dwIncDelta;
; 1040 : continue;
mov edx, DWORD PTR pfPFract
cmp edi, 0
jl SHORT $L30536
jmp SHORT $L30539
$L30540_:
; 982 : {
; 983 : if (pfLoopLength)
cmp DWORD PTR pfLoopLength, 0
je $L30539
; 984 : {
; 985 : pfSamplePos -= pfLoopLength;
sub ebx, DWORD PTR pfLoopLength
jmp $L30540
$L30541_:
; 994 : pfPFract += pfDeltaPitch;
mov ecx, DWORD PTR pfDeltaPitch
mov esi, DWORD PTR vfDeltaVolume
add ecx, edx
mov edx, DWORD PTR vfVFract
; 995 : pfPitch = pfPFract >> 8;
; 996 : vfVFract += vfDeltaVolume;
mov DWORD PTR pfPFract, ecx
add edx, esi
; 997 : vfLVolume = vfLVFract >> 8;
sar ecx, 8
mov DWORD PTR vfVFract, edx
sar edx, 8
mov esi, DWORD PTR dwDeltaPeriod
mov DWORD PTR vfVolume, edx
mov DWORD PTR pfPitch, ecx
mov DWORD PTR dwIncDelta, esi
; 993 : dwIncDelta = dwDeltaPeriod;
jmp $L30541
// Handle truncation.
overflow_:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflow
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflow
overflow_x:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflowx
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflowx
$L30543:
; 1044 : dwPosition = pfSamplePos >> 12;
mov edx, ebx
mov ecx, DWORD PTR pfPitch
; 1045 : dwFract = pfSamplePos & 0xFFF;
sar edx, 12 ; 0000000cH
mov esi, ebx
add ebx, ecx
and esi, 4095 ; 00000fffH
; 1046 : pfSamplePos += pfPitch;
mov ecx, DWORD PTR pcWave
; 1047 :
; 1048 : lLM = (long) pcWave[dwPosition];
movsx eax, BYTE PTR [ecx+edx]
; 1049 : lM = ((pcWave[dwPosition+1] - lLM) * dwFract);
; 1050 : lM >>= 12;
; 1051 : lM += lLM;
movsx edx, BYTE PTR [ecx+edx+1]
sub edx, eax
imul edx, esi
; 1052 : lLM = lM;
; 1053 : lLM *= vfLVolume;
; 1054 : lLM >>= 5; // Signal bumps up to 15 bits.
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfVolume
add edx, eax
; 1072 : pBuffer[dwI] += (short) lLM;
imul esi, edx
sar esi, 5 ; 00000005H
mov eax, DWORD PTR pBuf
add WORD PTR [eax+edi*2], si
jo overflow_
no_oflow:
inc edi
mov edx, DWORD PTR pfPFract
; 979 : for (dwI = 0; dwI < dwLength; )
mov ecx, DWORD PTR pfPitch
jl $L30536
$L30539:
mov DWORD PTR dwI, edi
mov DWORD PTR pfSamplePos, ebx
}
dwI += dwLength;
#endif // _X86_
m_vfLastLVolume = vfVolume;
m_vfLastRVolume = vfVolume; // !!! is this right?
m_pfLastPitch = pfPitch;
m_pfLastSample = pfSamplePos;
return (dwI);
}
/*****************************************************************************
* CDigitalAudio::Mix16()
*****************************************************************************
* Implement a stereo sixteen-bit mix.
* Heavily optimized for x86 non-MMX, plus C code for non-x86.
*/
DWORD CDigitalAudio::Mix16(short * pBuffer, DWORD dwLength,
DWORD dwDeltaPeriod, VFRACT vfDeltaLVolume,
VFRACT vfDeltaRVolume,PFRACT pfDeltaPitch,
PFRACT pfSampleLength,PFRACT pfLoopLength)
{
DWORD dwI;
DWORD dwPosition;
long lA;
long lM;
DWORD dwIncDelta = dwDeltaPeriod;
VFRACT dwFract;
short * pcWave = m_pnWave;
PFRACT pfSamplePos = m_pfLastSample;
VFRACT vfLVolume = m_vfLastLVolume;
VFRACT vfRVolume = m_vfLastRVolume;
PFRACT pfPitch = m_pfLastPitch;
PFRACT pfPFract = pfPitch << 8;
VFRACT vfLVFract = vfLVolume << 8; // Keep high res version around.
VFRACT vfRVFract = vfRVolume << 8;
dwLength <<= 1;
#ifndef _X86_
UNREFERENCED_PARAMETER(pBuffer);
for (dwI = 0; dwI < dwLength; )
{
if (pfSamplePos >= pfSampleLength)
{
if (pfLoopLength)
{
pfSamplePos -= pfLoopLength;
}
else
break;
}
dwIncDelta--;
if (!dwIncDelta)
{
dwIncDelta = dwDeltaPeriod;
pfPFract += pfDeltaPitch;
pfPitch = pfPFract >> 8;
vfLVFract += vfDeltaLVolume;
vfLVolume = vfLVFract >> 8;
vfRVFract += vfDeltaRVolume;
vfRVolume = vfRVFract >> 8;
}
dwPosition = pfSamplePos >> 12;
dwFract = pfSamplePos & 0xFFF;
pfSamplePos += pfPitch;
lA = (long) pcWave[dwPosition];
lM = ((pcWave[dwPosition+1] - lA) * dwFract);
lM >>= 12;
lM += lA;
lA = lM;
lA *= vfLVolume;
lA >>= 13; // Signal bumps up to 15 bits.
lM *= vfRVolume;
lM >>= 13;
#ifndef _X86_
#else // _X86_ (dead code)
// Keep this around so we can use it to generate new assembly code (see below...)
pBuffer[dwI] += (short) lA;
_asm{jno no_oflowl}
pBuffer[dwI] = 0x7fff;
_asm{js no_oflowl}
pBuffer[dwI] = (short) 0x8000;
no_oflowl:
pBuffer[dwI+1] += (short) lM;
_asm{jno no_oflowr}
pBuffer[dwI+1] = 0x7fff;
_asm{js no_oflowr}
pBuffer[dwI+1] = (short) 0x8000;
no_oflowr:
#endif // _X86_ (dead code)
dwI += 2;
}
#else // _X86_
int i, a, b, c, total;
short * pBuf = pBuffer + dwLength, *pBufX;
dwI = - dwLength;
_asm {
; 979 : for (dwI = 0; dwI < dwLength; )
// Induction variables.
mov edi, dwI
mov ebx, DWORD PTR pfSamplePos
// Previously set up.
cmp DWORD PTR dwLength, 0
mov edx, pfPFract
mov ecx, DWORD PTR pfPitch
je $L30539
$L30536:
cmp ebx, DWORD PTR pfSampleLength
; 981 : if (pfSamplePos >= pfSampleLength)
mov esi, DWORD PTR dwIncDelta
jge SHORT $L30540_
$L30540:
; 987 : else
; 988 : break;
; 990 : dwIncDelta--;
dec esi
mov DWORD PTR dwIncDelta, esi
; 991 : if (!dwIncDelta)
je SHORT $L30541_
$L30541:
// esi, edx, edi esi == dwIncDelta
mov DWORD PTR i, 0
; 1010 : b = dwIncDelta;
// esi = b == dwIncDelta
; 1011 : c = (pfSampleLength - pfSamplePos) / pfPitch;
; 1009 : a = (dwLength - dwI) / 2; // Remaining span.
mov edx, edi
neg edx
shr edx, 1 // edx = a
; 1017 : if (b < a && b < c)
cmp esi, edx
jge try_ax
mov eax, ecx
imul eax, esi
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1019 : i = b;
cmp esi, 3
jl got_it
mov DWORD PTR i, esi
jmp SHORT got_it
; 1013 : if (a < b && a < c)
try_a:
cmp edx, esi
jge try_c
try_ax:
mov eax, edx
imul eax, ecx
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1015 : i = a;
cmp edx, 3
jl got_it
mov DWORD PTR i, edx
jmp SHORT got_it
; 1021 : else if (c < a && c < b)
try_c:
push edx
mov eax, DWORD PTR pfSampleLength
sub eax, ebx
cdq
idiv ecx // eax == c
pop edx
cmp eax, edx
jge got_it
try_cx:
cmp eax, esi
jge got_it
; 1023 : i = c;
cmp eax, 3
jl $L30543
mov DWORD PTR i, eax
got_it:
mov edx, DWORD PTR i
mov eax, DWORD PTR pBuf
dec edx
jl $L30543
sub DWORD PTR dwIncDelta, edx
; 1093 : return (dwI >> 1);
; 1094 : }
lea edx, [edx*2+2] // Current span.
lea eax, [eax+edi*2] // Starting position.
add edi, edx // Remaining span.
lea eax, [eax+edx*2] // New ending position.
push edi
mov edi, edx // Current span.
mov DWORD PTR pBufX, eax
neg edi
$L30797:
; 1005 : do
; 1010 : dwPosition = pfSamplePos >> 12;
; 1011 : dwFract = pfSamplePos & 0xFFF;
mov edx, ebx
mov esi, ebx
add ebx, ecx
mov ecx, DWORD PTR pcWave
; 1012 : pfSamplePos += pfPitch;
sar edx, 12 ; 0000000cH
and esi, 4095 ; 00000fffH
; 1014 : lA = (long) pcWave[dwPosition];
movsx eax, WORD PTR [ecx+edx*2]
; 1015 : lM = ((pcWave[dwPosition+1] - lA) * dwFract);
; 1016 : lM >>= 12;
; 1017 : lM += lA;
movsx edx, WORD PTR [ecx+edx*2+2]
sub edx, eax
; 1018 : lA = lM;
; 1019 : lA *= vfLVolume;
; 1020 : lA >>= 13; // Signal bumps up to 15 bits.
; 1022 : pBuffer[dwI] += (short) lA;
; 1027 : no_oflowlx:
; 1028 : lM *= vfRVolume;
; 1029 : lM >>= 13;
; 1030 : pBuffer[dwI+1] += (short) lM;
; 1035 : no_oflowrx:
; 1037 : dwI += 2;
imul edx, esi
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfLVolume
add edx, eax
mov eax, DWORD PTR pBufX
imul esi, edx
sar esi, 13 ; 0000000dH
add WORD PTR [eax+edi*2], si
mov esi, DWORD PTR vfRVolume
jo overflow_lx
no_oflowlx:
imul esi, edx
; 1038 : } while (--dwIncDelta);
sar esi, 13 ; 0000000dH
mov ecx, DWORD PTR pfPitch
add WORD PTR [eax+edi*2+2], si
jo overflow_rx
no_oflowrx:
add edi, 2
jne SHORT $L30797
pop edi
; 1039 : ++dwIncDelta;
; 1040 : continue;
mov edx, DWORD PTR pfPFract
cmp edi, 0
jl SHORT $L30536
jmp SHORT $L30539
$L30540_:
; 982 : {
; 983 : if (pfLoopLength)
cmp DWORD PTR pfLoopLength, 0
je $L30539
; 985 : pfSamplePos -= pfLoopLength;
sub ebx, DWORD PTR pfLoopLength
jmp $L30540
$L30541_:
; 994 : pfPFract += pfDeltaPitch;
mov ecx, DWORD PTR pfDeltaPitch
mov esi, DWORD PTR vfDeltaLVolume
add ecx, edx
mov edx, DWORD PTR vfLVFract
; 995 : pfPitch = pfPFract >> 8;
; 996 : vfLVFract += vfDeltaLVolume;
mov DWORD PTR pfPFract, ecx
add edx, esi
; 997 : vfLVolume = vfLVFract >> 8;
; 998 : vfRVFract += vfDeltaRVolume;
sar ecx, 8
mov DWORD PTR vfLVFract, edx
sar edx, 8
mov esi, DWORD PTR vfDeltaRVolume
mov DWORD PTR vfLVolume, edx
mov edx, DWORD PTR vfRVFract
add edx, esi
mov DWORD PTR pfPitch, ecx
mov DWORD PTR vfRVFract, edx
mov esi, DWORD PTR dwDeltaPeriod
; 999 : vfRVolume = vfRVFract >> 8;
sar edx, 8
mov DWORD PTR dwIncDelta, esi
; 993 : dwIncDelta = dwDeltaPeriod;
mov DWORD PTR vfRVolume, edx
jmp $L30541
// Handle truncation.
overflow_l:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflowl
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflowl
overflow_r:
mov WORD PTR [eax+edi*2+2], 0x7fff
js no_oflowr
mov WORD PTR [eax+edi*2+2], 0x8000
jmp no_oflowr
overflow_lx:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflowlx
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflowlx
overflow_rx:
mov WORD PTR [eax+edi*2+2], 0x7fff
js no_oflowrx
mov WORD PTR [eax+edi*2+2], 0x8000
jmp no_oflowrx
$L30543:
; 1044 : dwPosition = pfSamplePos >> 12;
mov edx, ebx
mov ecx, DWORD PTR pfPitch
; 1045 : dwFract = pfSamplePos & 0xFFF;
sar edx, 12 ; 0000000cH
mov esi, ebx
and esi, 4095 ; 00000fffH
add ebx, ecx
; 1046 : pfSamplePos += pfPitch;
mov ecx, DWORD PTR pcWave
; 1047 :
; 1048 : lA = (long) pcWave[dwPosition];
movsx eax, WORD PTR [ecx+edx*2]
; 1049 : lM = ((pcWave[dwPosition+1] - lA) * dwFract);
; 1050 : lM >>= 12;
; 1051 : lM += lA;
movsx edx, WORD PTR [ecx+edx*2+2]
sub edx, eax
imul edx, esi
; 1052 : lA = lM;
; 1053 : lA *= vfLVolume;
; 1054 : lA >>= 13; // Signal bumps up to 15 bits.
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfLVolume
add edx, eax
; 1072 : pBuffer[dwI] += (short) lA;
imul esi, edx
sar esi, 13 ; 0000000dH
mov eax, DWORD PTR pBuf
add WORD PTR [eax+edi*2], si
mov esi, DWORD PTR vfRVolume
jo overflow_l
no_oflowl:
; 1077 : no_oflowl:
; 1078 : lM *= vfRVolume;
; 1079 : lM >>= 13;
imul esi, edx
; 1080 : pBuffer[dwI+1] += (short) lM;
; 1085 : no_oflowr:
; 1087 : dwI += 2;
sar esi, 13 ; 0000000dH
mov ecx, DWORD PTR pfPitch
add WORD PTR [eax+edi*2+2], si
mov edx, DWORD PTR pfPFract
jo overflow_r
no_oflowr:
add edi, 2
; 978 :
; 979 : for (dwI = 0; dwI < dwLength; )
jl $L30536
$L30539:
mov DWORD PTR dwI, edi
mov DWORD PTR pfSamplePos, ebx
}
dwI += dwLength;
#endif // _X86_
m_vfLastLVolume = vfLVolume;
m_vfLastRVolume = vfRVolume;
m_pfLastPitch = pfPitch;
m_pfLastSample = pfSamplePos;
return (dwI >> 1);
}
/*****************************************************************************
* CDigitalAudio::MixMono16()
*****************************************************************************
* Implement a mono sixteen-bit mix.
* Heavily optimized for x86 non-MMX, plus C code for non-x86.
*/
DWORD CDigitalAudio::MixMono16(short * pBuffer, DWORD dwLength,
DWORD dwDeltaPeriod,VFRACT vfDeltaVolume,
PFRACT pfDeltaPitch,PFRACT pfSampleLength,
PFRACT pfLoopLength)
{
DWORD dwI;
DWORD dwPosition;
long lA;//, lB;
long lM;
DWORD dwIncDelta = dwDeltaPeriod;
VFRACT dwFract;
short * pcWave = m_pnWave;
PFRACT pfSamplePos = m_pfLastSample;
VFRACT vfVolume = m_vfLastLVolume;
PFRACT pfPitch = m_pfLastPitch;
PFRACT pfPFract = pfPitch << 8;
VFRACT vfVFract = vfVolume << 8; // Keep high res version around.
#ifndef _X86_
UNREFERENCED_PARAMETER(pBuffer);
for (dwI = 0; dwI < dwLength;)
{
if (pfSamplePos >= pfSampleLength)
{
if (pfLoopLength)
pfSamplePos -= pfLoopLength;
else
break;
}
dwIncDelta--;
if (!dwIncDelta)
{
dwIncDelta = dwDeltaPeriod;
pfPFract += pfDeltaPitch;
pfPitch = pfPFract >> 8;
vfVFract += vfDeltaVolume;
vfVolume = vfVFract >> 8;
}
dwPosition = pfSamplePos >> 12;
dwFract = pfSamplePos & 0xFFF;
pfSamplePos += pfPitch;
lA = (long) pcWave[dwPosition];
lM = (((pcWave[dwPosition+1] - lA) * dwFract) >> 12) + lA;
lM *= vfVolume;
lM >>= 13; // Signal bumps up to 12 bits.
#ifndef _X86_
#else // _X86_ (dead code)
// Keep this around so we can use it to generate new assembly code (see below...)
pBuffer[dwI] += (short) lM;
_asm{jno no_oflow}
pBuffer[dwI] = 0x7fff;
_asm{js no_oflow}
pBuffer[dwI] = (short) 0x8000;
no_oflow:
#endif // _X86 (dead code)
dwI++;
}
#else // _X86_
int i, a, b, c, total;
short * pBuf = pBuffer + dwLength, *pBufX;
dwI = - dwLength;
_asm {
; 979 : for (dwI = 0; dwI < dwLength; )
// Induction variables.
mov edi, dwI
mov ebx, DWORD PTR pfSamplePos
// Previously set up.
cmp DWORD PTR dwLength, 0
mov edx, pfPFract
mov ecx, DWORD PTR pfPitch
je $L30539
$L30536:
cmp ebx, DWORD PTR pfSampleLength
; 981 : if (pfSamplePos >= pfSampleLength)
mov esi, DWORD PTR dwIncDelta
jge SHORT $L30540_
$L30540:
; 987 : else
; 988 : break;
; 990 : dwIncDelta--;
dec esi
mov DWORD PTR dwIncDelta, esi
; 991 : if (!dwIncDelta)
je SHORT $L30541_
$L30541:
// esi, edx, edi esi == dwIncDelta
mov DWORD PTR i, 0
; 1010 : b = dwIncDelta;
// esi = b == dwIncDelta
; 1011 : c = (pfSampleLength - pfSamplePos) / pfPitch;
; 1009 : a = dwLength - dwI; // Remaining span.
mov edx, edi
neg edx
; 1017 : if (b < a && b < c)
cmp esi, edx
jge try_ax
mov eax, ecx
imul eax, esi
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1019 : i = b;
cmp esi, 3
jl got_it
mov DWORD PTR i, esi
jmp SHORT got_it
; 1013 : if (a < b && a < c)
try_a:
cmp edx, esi
jge try_c
try_ax:
mov eax, edx
imul eax, ecx
add eax, ebx
cmp eax, DWORD PTR pfSampleLength
jge try_c
; 1015 : i = a;
cmp edx, 3
jl got_it
mov DWORD PTR i, edx
jmp SHORT got_it
; 1021 : else if (c < a && c < b)
try_c:
push edx
mov eax, DWORD PTR pfSampleLength
sub eax, ebx
cdq
idiv ecx // eax == c
pop edx
cmp eax, edx
jge got_it
try_cx:
cmp eax, esi
jge got_it
; 1023 : i = c;
cmp eax, 3
jl $L30543
mov DWORD PTR i, eax
got_it:
mov edx, DWORD PTR i
mov eax, DWORD PTR pBuf
dec edx
jl $L30543
sub DWORD PTR dwIncDelta, edx
; 1093 : return (dwI);
; 1094 : }
lea edx, [edx+1] // Current span.
lea eax, [eax+edi*2] // Starting position.
add edi, edx // Remaining span.
lea eax, [eax+edx*2] // New ending position.
push edi
mov edi, edx // Current span.
mov DWORD PTR pBufX, eax
neg edi
$L30797:
; 1005 : do
; 1010 : dwPosition = pfSamplePos >> 12;
; 1011 : dwFract = pfSamplePos & 0xFFF;
mov edx, ebx
mov esi, ebx
add ebx, ecx
mov ecx, DWORD PTR pcWave
; 1012 : pfSamplePos += pfPitch;
sar edx, 12 ; 0000000cH
and esi, 4095 ; 00000fffH
; 1013 :
; 1014 : lA = (long) pcWave[dwPosition];
movsx eax, WORD PTR [ecx+edx*2]
; 1015 : lM = ((pcWave[dwPosition+1] - lA) * dwFract);
; 1016 : lM >>= 12;
; 1017 : lM += lA;
movsx edx, WORD PTR [ecx+edx*2+2]
sub edx, eax
; 1018 : lA = lM;
; 1019 : lA *= vfLVolume;
; 1020 : lA >>= 13; // Signal bumps up to 15 bits.
; 1022 : pBuffer[dwI] += (short) lA;
; 1027 : no_oflowx:
; 1037 : ++dwI;
imul edx, esi
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfVolume
add edx, eax
mov ecx, DWORD PTR pfPitch
imul esi, edx
sar esi, 13 ; 0000000dH
mov eax, DWORD PTR pBufX
add WORD PTR [eax+edi*2], si
jo overflow_x
no_oflowx:
; 1038 : } while (--dwIncDelta);
inc edi
jne SHORT $L30797
pop edi
; 1039 : ++dwIncDelta;
; 1040 : continue;
mov edx, DWORD PTR pfPFract
cmp edi, 0
jl SHORT $L30536
jmp SHORT $L30539
$L30540_:
; 983 : if (pfLoopLength)
cmp DWORD PTR pfLoopLength, 0
je $L30539
; 985 : pfSamplePos -= pfLoopLength;
sub ebx, DWORD PTR pfLoopLength
jmp $L30540
$L30541_:
; 994 : pfPFract += pfDeltaPitch;
mov ecx, DWORD PTR pfDeltaPitch
mov esi, DWORD PTR vfDeltaVolume
add ecx, edx
mov edx, DWORD PTR vfVFract
; 995 : pfPitch = pfPFract >> 8;
; 996 : vfVFract += vfDeltaVolume;
mov DWORD PTR pfPFract, ecx
add edx, esi
; 997 : vfVolume = vfVFract >> 8;
sar ecx, 8
mov DWORD PTR vfVFract, edx
sar edx, 8
mov esi, DWORD PTR dwDeltaPeriod
mov DWORD PTR vfVolume, edx
mov DWORD PTR pfPitch, ecx
mov DWORD PTR dwIncDelta, esi
; 993 : dwIncDelta = dwDeltaPeriod;
jmp $L30541
// Handle truncation.
overflow_:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflow
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflow
overflow_x:
mov WORD PTR [eax+edi*2], 0x7fff
js no_oflowx
mov WORD PTR [eax+edi*2], 0x8000
jmp no_oflowx
$L30543:
; 1044 : dwPosition = pfSamplePos >> 12;
mov edx, ebx
mov ecx, DWORD PTR pfPitch
; 1045 : dwFract = pfSamplePos & 0xFFF;
sar edx, 12 ; 0000000cH
mov esi, ebx
and esi, 4095 ; 00000fffH
add ebx, ecx
; 1046 : pfSamplePos += pfPitch;
mov ecx, DWORD PTR pcWave
; 1047 :
; 1048 : lA = (long) pcWave[dwPosition];
movsx eax, WORD PTR [ecx+edx*2]
; 1049 : lM = ((pcWave[dwPosition+1] - lA) * dwFract);
; 1050 : lM >>= 12;
; 1051 : lM += lA;
movsx edx, WORD PTR [ecx+edx*2+2]
sub edx, eax
imul edx, esi
; 1052 : lA = lM;
; 1053 : lA *= vfVolume;
; 1054 : lA >>= 13; // Signal bumps up to 15 bits.
sar edx, 12 ; 0000000cH
mov esi, DWORD PTR vfVolume
add edx, eax
; 1072 : pBuffer[dwI] += (short) lA;
imul esi, edx
sar esi, 13 ; 0000000dH
mov eax, DWORD PTR pBuf
add WORD PTR [eax+edi*2], si
jo overflow_
no_oflow:
; 1077 : no_oflowl:
; 1087 : ++dwI;
inc edi
mov edx, DWORD PTR pfPFract
; 979 : for (dwI = 0; dwI < dwLength; )
mov ecx, DWORD PTR pfPitch
jl $L30536
$L30539:
mov DWORD PTR dwI, edi
mov DWORD PTR pfSamplePos, ebx
}
dwI += dwLength;
#endif // _X86_
m_vfLastLVolume = vfVolume;
m_vfLastRVolume = vfVolume; // !!! is this right?
m_pfLastPitch = pfPitch;
m_pfLastSample = pfSamplePos;
return (dwI);
}
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