Glenn Maynard
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
#include "global.h"
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#include "RageSoundUtil.h"
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#include "RageUtil.h"
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/* Some of these functions assume a channel count: */
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static const int channels = 2;
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/* Pan buffer left or right; fPos is -1...+1. Buffer is assumed to be stereo. */
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void RageSoundUtil::Pan( int16_t *buffer, int frames, float fPos )
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{
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if( fPos == 0 )
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return; /* no change */
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bool bSwap = fPos < 0;
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if( bSwap )
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fPos = -fPos;
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float fLeftFactors[2] ={ 1-fPos, 0 };
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float fRightFactors[2] =
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{
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SCALE( fPos, 0, 1, 0.5f, 0 ),
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SCALE( fPos, 0, 1, 0.5f, 1 )
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};
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if( bSwap )
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{
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swap( fLeftFactors[0], fRightFactors[0] );
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swap( fLeftFactors[1], fRightFactors[1] );
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}
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ASSERT_M( channels == 2, ssprintf("%i", channels) );
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for( int samp = 0; samp < frames; ++samp )
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{
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int16_t l = int16_t(buffer[0]*fLeftFactors[0] + buffer[1]*fLeftFactors[1]);
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int16_t r = int16_t(buffer[0]*fRightFactors[0] + buffer[1]*fRightFactors[1]);
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buffer[0] = l;
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buffer[1] = r;
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buffer += 2;
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}
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}
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void RageSoundUtil::Fade( int16_t *buffer, int frames, float fStartVolume, float fEndVolume )
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{
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/* If the whole buffer is full volume, skip. */
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if( fStartVolume > .9999f && fEndVolume > .9999f )
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return;
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for( int samp = 0; samp < frames; ++samp )
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{
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float fVolPercent = SCALE( samp, 0, frames, fStartVolume, fEndVolume );
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fVolPercent = clamp( fVolPercent, 0.f, 1.f );
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for(int i = 0; i < channels; ++i)
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{
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*buffer = short(*buffer * fVolPercent);
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buffer++;
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}
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}
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}
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/* Dupe mono to stereo in-place; do it in reverse, to handle overlap. */
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void RageSoundUtil::ConvertMonoToStereoInPlace( int16_t *data, int iFrames )
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{
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int16_t *input = data;
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int16_t *output = input;
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input += iFrames;
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output += iFrames * 2;
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while( iFrames-- )
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{
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input -= 1;
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output -= 2;
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output[0] = input[0];
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output[1] = input[0];
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}
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}
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/*
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* Copyright (c) 2002-2004 Glenn Maynard
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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