Glenn Maynard
97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
/*
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* Pitch changing is implemented by combining speed changing and rate changing
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* (via resampling). The resampler needs to be changed later than the speed
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* changer; this class just controls parameters on the other two real filters.
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*/
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#include "global.h"
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#include "RageSoundReader_PitchChange.h"
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#include "RageSoundReader_SpeedChange.h"
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#include "RageSoundReader_Resample_Good.h"
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#include "RageLog.h"
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RageSoundReader_PitchChange::RageSoundReader_PitchChange( RageSoundReader *pSource ):
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RageSoundReader_Filter( NULL )
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{
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m_pSpeedChange = new RageSoundReader_SpeedChange( pSource );
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m_pResample = new RageSoundReader_Resample_Good( m_pSpeedChange, m_pSpeedChange->GetSampleRate() );
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m_pSource = m_pResample;
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m_fSpeedRatio = 1.0f;
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m_fPitchRatio = 1.0f;
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}
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RageSoundReader_PitchChange::RageSoundReader_PitchChange( const RageSoundReader_PitchChange &cpy ):
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RageSoundReader_Filter( cpy )
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{
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/* The source tree has already been copied. Our source is m_pResample; its source
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* is m_pSpeedChange (and its source is a copy of the pSource we were initialized
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* with). */
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m_pResample = dynamic_cast<RageSoundReader_Resample_Good *>( &*m_pSource );
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m_pSpeedChange = dynamic_cast<RageSoundReader_SpeedChange *>( m_pResample->GetSource() );
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m_fSpeedRatio = cpy.m_fSpeedRatio;
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m_fPitchRatio = cpy.m_fPitchRatio;
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}
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int RageSoundReader_PitchChange::Read( char *pBuf, int iFrames )
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{
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/* Changing the ratios will tell the speed changer to change ratios, but it
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* can't change immediately; it'll change on the next slice. The resampler
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* puts rate changes into effect immediately. If this read will cause the
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* speed changer new ratio to put a new ratio into effect, tell the resampler
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* to do the same. This way, changes to the ratios will take effect in both
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* the resampler and speed changer as closely together as possible. */
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m_pSpeedChange->SetSpeedRatio( m_fSpeedRatio / m_fPitchRatio );
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if( m_pSpeedChange->NextReadWillStep() )
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m_pResample->SetRate( m_fPitchRatio );
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return RageSoundReader_Filter::Read( pBuf, iFrames );
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}
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bool RageSoundReader_PitchChange::SetProperty( const RString &sProperty, float fValue )
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{
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if( sProperty == "Rate" )
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{
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/* Don't propagate this. m_pResample will take it, but it's under
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* our control. */
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return false;
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}
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if( sProperty == "Speed" )
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{
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SetSpeedRatio( fValue );
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return true;
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}
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if( sProperty == "Pitch" )
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{
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SetPitchRatio( fValue );
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return true;
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}
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return RageSoundReader_Filter::SetProperty( sProperty, fValue );
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}
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/*
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* Copyright (c) 2006 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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