Glenn Maynard
157 lines
4.0 KiB
C++
157 lines
4.0 KiB
C++
#include "global.h"
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#include "RageSoundResampler.h"
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#include "RageUtil.h"
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#include "RageLog.h"
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/*
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* This class handles sound resampling.
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*
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* This isn't very efficient; we write to a static buffer instead of a circular
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* one. I'll optimize it if it becomes an issue.
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*/
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RageSoundResampler::RageSoundResampler()
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{
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reset();
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}
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void RageSoundResampler::reset()
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{
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at_eof = false;
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memset(prev, 0, sizeof(prev));
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memset(t, 0, sizeof(t));
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outbuf.clear();
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ipos = 0;
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Channels = 2;
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}
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/* Write data to be converted. */
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void RageSoundResampler::write(const void *data_, int bytes)
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{
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ASSERT(!at_eof);
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const int16_t *data = (const int16_t *) data_;
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const unsigned samples = bytes / sizeof(int16_t);
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const unsigned frames = samples / Channels;
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if(InputRate == OutputRate)
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{
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/* Optimization. */
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outbuf.insert(outbuf.end(), data, data+samples);
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return;
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}
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#if 0
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/* Much higher quality for 44100->48000 resampling, but way too slow. */
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const int upsamp = 8;
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const float div = float(InputRate*upsamp) / OutputRate;
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for(unsigned f = 0; f < frames; ++f)
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{
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for(int u = 0; u < upsamp; ++u)
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{
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int ipos_begin = (int) roundf(ipos / div);
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int ipos_end = (int) roundf((ipos+1) / div);
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for(int c = 0; c < Channels; ++c)
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{
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const float f = 0.5f;
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prev[c] = int16_t(prev[c] * (f) + data[c] * (1-f));
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for(int i = ipos_begin; i < ipos_end; ++i)
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outbuf.push_back(prev[c]);
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}
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ipos++;
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}
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data += Channels;
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}
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#else
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/* Lerp. */
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const float div = float(InputRate) / OutputRate;
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for(unsigned f = 0; f < frames; ++f)
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{
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for(int c = 0; c < Channels; ++c)
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{
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while(t[c] < 1.0f)
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{
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int16_t s = int16_t(prev[c]*(1-t[c]) + data[c]*t[c]);
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outbuf.push_back(s);
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t[c] += div;
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}
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t[c] -= 1;
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prev[c] = data[c];
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}
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ipos++;
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data += Channels;
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}
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#endif
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}
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void RageSoundResampler::eof()
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{
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ASSERT(!at_eof);
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/* Write some silence to flush out the real data. If we don't have any sound,
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* don't do this, so seeking past end of file doesn't write silence. */
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bool bNeedsFlush = false;
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for( int c = 0; c < Channels; ++c )
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if( prev[c] != 0 )
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bNeedsFlush = true;
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if( bNeedsFlush )
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{
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const int size = Channels*16;
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int16_t *data = new int16_t[size];
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memset(data, 0, size * sizeof(int16_t));
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write(data, size * sizeof(int16_t));
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delete [] data;
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}
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at_eof = true;
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}
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int RageSoundResampler::read(void *data, unsigned bytes)
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{
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/* Don't be silly. */
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ASSERT( (bytes % sizeof(int16_t)) == 0);
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/* If no data is available, and we're at_eof, return -1. */
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if(outbuf.size() == 0 && at_eof)
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return -1;
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/* Fill as much as we have. */
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int Avail = min(outbuf.size()*sizeof(int16_t), bytes);
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memcpy(data, &outbuf[0], Avail);
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outbuf.erase(outbuf.begin(), outbuf.begin() + Avail/sizeof(int16_t));
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return Avail;
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}
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/*
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* Copyright (c) 2003 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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