sukibaby
104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
#include "global.h"
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#include "RageSoundMixBuffer.h"
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#include <cmath>
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#include <cstdint>
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#include <algorithm>
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#include <vector>
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RageSoundMixBuffer::RageSoundMixBuffer() : m_iOffset(0) {}
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RageSoundMixBuffer::~RageSoundMixBuffer() {}
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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 = static_cast<int>(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_pMixbuf.size() < realsize)
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{
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m_pMixbuf.resize(realsize, 0.0f);
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}
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}
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void RageSoundMixBuffer::write( const float *pBuf, unsigned iSize, int iSourceStride, int iDestStride )
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{
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if( iSize == 0 )
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return;
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// iSize = 3, iDestStride = 2 uses 4 frames. Don't allocate the stride of the last sample.
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Extend( iSize * iDestStride - (iDestStride-1) );
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// Load the audio at m_iOffset into the buffer.
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float *pDestBuf = &m_pMixbuf[m_iOffset];
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while( iSize )
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{
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*pDestBuf += *pBuf;
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pBuf += iSourceStride;
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pDestBuf += iDestStride;
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--iSize;
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}
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}
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void RageSoundMixBuffer::read( int16_t *pBuf )
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{
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for (unsigned iPos = 0; iPos < m_pMixbuf.size(); ++iPos)
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{
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// do the read
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float iOut = m_pMixbuf[iPos];
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// ensure volume is within expected levels to prevent clipping
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iOut = std::clamp( iOut, -1.0f, +1.0f );
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// round rather than truncate to minimize distortion
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pBuf[iPos] = static_cast<int16_t>(std::round(iOut * INT16_MAX));
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}
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m_pMixbuf.clear();
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}
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void RageSoundMixBuffer::read( float *pBuf )
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{
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std::copy(m_pMixbuf.begin(), m_pMixbuf.end(), pBuf);
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m_pMixbuf.clear();
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}
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void RageSoundMixBuffer::read_deinterlace( float **pBufs, int channels )
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{
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for (unsigned i = 0; i < m_pMixbuf.size() / channels; ++i)
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{
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for (int ch = 0; ch < channels; ++ch)
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{
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pBufs[ch][i] = m_pMixbuf[channels * i + ch];
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}
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}
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m_pMixbuf.clear();
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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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