Glenn Maynard
1bd5513698
This allows us to change the volume of sounds in filters ("volume",
"fade" properties) without quantizing the audio prematurely. Previously,
we had a hack to apply volume changes as a mixing-time step. This
can be done at any point in the filter chain now.
This also means we only need to worry about clipping at the very
last mixing step, instead of at every place we change sound.
Dithering for 16-bit audio and more intelligent gain control
is possible, as we have full-resolution, unclipped sound at the
mixing phase.
We support high resolution source sounds; both Vorbis and MAD
supply more than 16 bits.
Several filters, such as resampling, are easier to implement as
floats; these no longer need to convert back and forth.
Negatives:
- More memory use. The main case of this is in RageSoundReader_Preload,
which will be fixed: we can preload in 16-bit without losing most of the
above.
- Some extra overhead for accessing more memory.
125 lines
4.7 KiB
C++
125 lines
4.7 KiB
C++
/*
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* Implements properties:
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* "Speed" - cause the sound to play faster or slower
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* "Pitch" - raise or lower the pitch of the sound
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*
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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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m_fLastSetSpeedRatio = m_fSpeedRatio;
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m_fLastSetPitchRatio = m_fPitchRatio;
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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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m_fLastSetSpeedRatio = cpy.m_fLastSetSpeedRatio;
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m_fLastSetPitchRatio = cpy.m_fLastSetPitchRatio;
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}
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int RageSoundReader_PitchChange::Read( float *pBuf, int iFrames )
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{
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/* m_pSpeedChange->NextReadWillStep is true if speed changes will be applied
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* immediately on the next Read(). When this is true, apply the ratio to the
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* resampler and the speed changer simultaneously, so they take effect as
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* closely together as possible. */
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if( (m_fLastSetSpeedRatio != m_fSpeedRatio || m_fLastSetPitchRatio != m_fPitchRatio) &&
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m_pSpeedChange->NextReadWillStep() )
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{
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float fRate = GetStreamToSourceRatio();
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/* This is the simple way: */
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// m_pResample->SetRate( m_fPitchRatio );
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// m_pSpeedChange->SetSpeedRatio( m_fSpeedRatio / m_fPitchRatio );
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/* However, the resampler has a limited granularity due to internal fixed-
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* point math, and the actual ratio will be slightly different than what
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* we tell it to use. The actual ratio used is fActualPitchRatio. */
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m_pResample->SetRate( m_fPitchRatio );
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float fActualPitchRatio = m_pResample->GetRate();
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float fRequestedSpeedRatio = m_fSpeedRatio / fActualPitchRatio;
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m_pSpeedChange->SetSpeedRatio( fRequestedSpeedRatio );
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m_fLastSetSpeedRatio = m_fSpeedRatio;
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m_fLastSetPitchRatio = m_fPitchRatio;
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/* If we just applied a new speed and it caused the ratio to change, return
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* no data, so the caller can see the new ratio. */
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if( fRate != GetStreamToSourceRatio() )
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return 0;
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}
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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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