Glenn Maynard
103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
#include "global.h"
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#include "RageSoundMixBuffer.h"
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#include "RageUtil.h"
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RageSoundMixBuffer::RageSoundMixBuffer()
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{
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m_iBufSize = m_iBufUsed = 0;
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m_pMixbuf = NULL;
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m_iOffset = 0;
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SetVolume( 1.0f );
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}
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RageSoundMixBuffer::~RageSoundMixBuffer()
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{
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free( m_pMixbuf );
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}
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void RageSoundMixBuffer::SetVolume( float f )
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{
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m_iVolumeFactor = int(256*f);
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}
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/* write() will start mixing iOffset samples into the buffer. Be careful; this is
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* measured in samples, not frames, so if the data is stereo, multiply by two. */
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void RageSoundMixBuffer::SetWriteOffset( int iOffset )
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{
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m_iOffset = iOffset;
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}
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void RageSoundMixBuffer::Extend( unsigned iSamples )
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{
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const unsigned realsize = iSamples+m_iOffset;
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if( m_iBufSize < realsize )
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{
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m_pMixbuf = (int32_t *) realloc( m_pMixbuf, sizeof(int32_t) * realsize );
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m_iBufSize = realsize;
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}
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if( m_iBufUsed < realsize )
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{
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memset( m_pMixbuf + m_iBufUsed, 0, (realsize - m_iBufUsed) * sizeof(int32_t) );
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m_iBufUsed = realsize;
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}
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}
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void RageSoundMixBuffer::write( const int16_t *buf, unsigned size )
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{
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Extend( size );
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/* Scale volume and add. */
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int32_t *pBuf = m_pMixbuf+m_iOffset;
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for( unsigned pos = 0; pos < size; ++pos )
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{
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*pBuf += buf[pos] * m_iVolumeFactor; ++pBuf;
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}
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}
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void RageSoundMixBuffer::read( int16_t *buf )
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{
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for( unsigned pos = 0; pos < m_iBufUsed; ++pos )
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{
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int32_t out = (m_pMixbuf[pos]) / 256;
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buf[pos] = (int16_t) clamp( out, -32768, 32767 );
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}
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m_iBufUsed = 0;
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}
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void RageSoundMixBuffer::read( float *buf )
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{
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const int Minimum = -32768 * 256;
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const int Maximum = 32767 * 256;
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for( unsigned pos = 0; pos < m_iBufUsed; ++pos )
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buf[pos] = SCALE( (float)m_pMixbuf[pos], Minimum, Maximum, -1.0f, 1.0f );
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m_iBufUsed = 0;
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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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