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better balance

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This commit is contained in:
Glenn Maynard
2004-02-28 02:35:18 +00:00
parent be03ed1c21
commit 9530cff9a6
1 changed files with 24 additions and 6 deletions
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stepmania/src/RageSound.cpp
+24 -6
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@@ -472,15 +472,33 @@ int RageSound::GetPCM( char *buffer, int size, int64_t frameno )
if( m_Param.m_Balance != 0 ) if( m_Param.m_Balance != 0 )
{ {
Sint16 *p = (Sint16 *) buffer; Sint16 *p = (Sint16 *) buffer;
const float fLeft = SCALE( m_Param.m_Balance, -1, 1, 1, 0 );
const float fRight = SCALE( m_Param.m_Balance, -1, 1, 0, 1 ); float fBalance = m_Param.m_Balance;
const int iLeft = int(fLeft*256); bool bSwap = fBalance < 0;
const int iRight = int(fRight*256); if( bSwap )
fBalance = -fBalance;
float fLeftFactors[2] ={ 1-fBalance, 0 };
float fRightFactors[2] =
{
SCALE( fBalance, 0, 1, 0.5f, 0 ),
SCALE( fBalance, 0, 1, 0.5f, 1 )
};
if( bSwap )
{
swap( fLeftFactors[0], fRightFactors[0] );
swap( fLeftFactors[1], fRightFactors[1] );
}
RAGE_ASSERT_M( channels == 2, ssprintf("%i", channels) ); RAGE_ASSERT_M( channels == 2, ssprintf("%i", channels) );
for( int samp = 0; samp < got_frames; ++samp ) for( int samp = 0; samp < got_frames; ++samp )
{ {
*(p++) = short( (*p * iLeft) >> 8 ); Sint16 l = Sint16(p[0]*fLeftFactors[0] + p[1]*fLeftFactors[1]);
*(p++) = short( (*p * iRight) >> 8 ); Sint16 r = Sint16(p[0]*fRightFactors[0] + p[1]*fRightFactors[1]);
p[0] = l;
p[1] = r;
p+=2;
} }
} }