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.
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
/* RageSoundReader_SpeedChange - change the speed of an audio stream without changing its pitch. */
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#ifndef RAGE_SOUND_READER_SPEED_CHANGE_H
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#define RAGE_SOUND_READER_SPEED_CHANGE_H
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#include "RageSoundReader_Filter.h"
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class RageSoundReader_SpeedChange: public RageSoundReader_Filter
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{
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public:
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RageSoundReader_SpeedChange( RageSoundReader *pSource );
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virtual int SetPosition( int iFrame );
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virtual int Read( float *pBuf, int iFrames );
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virtual RageSoundReader_SpeedChange *Copy() const { return new RageSoundReader_SpeedChange(*this); }
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virtual bool SetProperty( const RString &sProperty, float fValue );
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virtual int GetNextSourceFrame() const;
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virtual float GetStreamToSourceRatio() const;
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void SetSpeedRatio( float fRatio );
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/* Return true if the next Read() will start a new block, allowing GetRatio() to
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* be updated to a new value. Used by RageSoundReader_PitchChange. */
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bool NextReadWillStep() const { return GetCursorAvail() == 0; }
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/* Get the ratio last set by SetSpeedRatio. */
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float GetRatio() const { return m_fSpeedRatio; }
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protected:
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int FillData( int iMax );
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void EraseData( int iToDelete );
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int Step();
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void Reset();
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int GetCursorAvail() const;
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int GetWindowSizeFrames() const;
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int GetToleranceFrames() const { return GetWindowSizeFrames() / 4; }
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int m_iDataBufferAvailFrames;
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struct ChannelInfo
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{
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vector<float> m_DataBuffer;
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int m_iCorrelatedPos;
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int m_iLastCorrelatedPos;
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};
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vector<ChannelInfo> m_Channels;
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int m_iUncorrelatedPos;
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int m_iPos;
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float m_fSpeedRatio;
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float m_fTrailingSpeedRatio;
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float m_fErrorFrames;
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};
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#endif
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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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