mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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159 lines
6.7 KiB
Text
159 lines
6.7 KiB
Text
changes:
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date = 09-feb-2001 [Markus Fick]
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-> file: fastmix.cpp
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where: spline creation, spline macros
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what: added unity gain clamp code, added Quantizer_Bits(shift) preprocessor constants
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where: fir creation, fir macros
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what: - removed x<pi/2 condition in coef creation
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- added quantizer_bits(shift) preprocessor constants
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- set default quantizer bits to 15 instead 14 (scale now 32768 instead 16384)
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there should not occure any overflows during fir response calculation because
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of the symmetric form of filter and the position of the negative fir coefs
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- changed final volume calculation for 16bit samples (quality enhancement)
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date = 08-feb-2001 [Markus Fick]
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-> file: sndmix.cpp
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where: function ReadNote()
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what: modified behaviour of modplug so that interpolation is only deactivated if
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a) the user selects "no interpolation"
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b) linear interpolation is set and speed incr. > 0xff00
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=> if spline or fir is active then we use always interpolation
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-> file: fastmix.cpp
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where: spline macros
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what: changed spline macros to use precalculated tables (way faster)
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where: file
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what: - implemented spline table precalculator
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- changed fir precalculator + macros (for higher quality and clearer source)
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- added some comments and documentation
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comment:
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- preprocessor constant: SPLINE_FRACBITS
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) controls quality/memory usage
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range is [4..14] inclusive
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4 = low quality, low memory usage
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14 = highest quality, highest memory usage (1L<<14)*4*2 bytes
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- preprocessor constant: WFIR_FRACBITS
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) controls quality/memory usage
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range is [4..12] inclusive
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4 = low quality, low mu
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12 = highest quality, highest memory usage ((1L<<(12+1))+1)*8*2 bytes
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date = 07-feb-2001 [Markus Fick]
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-> file: fastmix.cpp
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where: spline macros
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what: fixed error in coef calculation
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date = 07-feb-2001 [Markus Fick]
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-> file: sndfile.h
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where: class definition of soundfile
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what: removed InitFIR + DoneFIR function prototypes
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-> file: sndfile.cpp
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function:CSoundFile::CSoundFile()
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what: [modify] removed call to CSoundFile::InitFIRMixer( )
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function:CSoundFile::~CSoundFile()
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what: [modify] removed call to CSoundFile::DoneFIRMixer( )
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-> file: fastmix.cpp
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where: spline macros
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what: changed formula + added some guard bits to calculation
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where: fir macros + implementation
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what: - moved CSoundfile::FIR funtions to CzFIR (single instance sfir)
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- changed fir macros to support CzFIR class
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date = 06-feb-2001 [Markus Fick]
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-> file: fastmix.cpp
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where: macros
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what: - removed fir filter with coef interpolation
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- add spline interpolation
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RM: now modplug->select( SPLINE ) selects spline and
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modplug->select( POLYPHASE ) selects 8tap fir filter
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date = 05-feb-2001 [Markus Fick]
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-> file: fastmix.cpp
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where: macros + filter order
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what: [modify] changed filter order to 8 instead of 10
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-> file: fastmix.cpp
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what: new macros+switch for fir-interpolator with coef interpolation
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date = 04-feb-2001 [Markus Fick]
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-> file: sndfile.h
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where: class CSoundFile (bottom)
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what: [add] methods for FIR mixer support
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1. int InitFIRInterpolator( );
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2. int DoneFIRInterpolator( );
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-> file: sndfile.cpp
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function:CSoundFile::CSoundFile()
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what: [modify] add call to CSoundFile::InitFIRMixer( )
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function:CSoundFile::~CSoundFile()
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what: [modify] add call to CSoundFile::DoneFIRMixer( )
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-> file: fastmix.cpp
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new include: <math.h>
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why: need it for fir-coef calculation
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new function: CSoundFile::InitFIRMixer( ) // initializes fir filter lookup (if necessary)
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new function: CSoundFile::DoneFIRMixer( ) // decrements ReferenceCounter (for static vars) and deinitializes fir struct (if possible).
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new defs:
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#define FIRCPWBN 10 // log2 of number of precalculated wings (-(1L<<FIRCPWBN)..(1L<<FIRCPWBN))
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#define FIRLOPOSSHIFT (16-(FIRCPWBN+1)) // shift for lopos of sampleposition -> (16 - FIRCPWBN - 1)
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#define FIRLEN 9 // number(-1) of multiplications per sample
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#define FIRCUT 0.90f // cutoff of filter
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#define MIXNDX_FIRMIXERSRC 0x20 // src-type for firfilter
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new vars:
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static signed short *cFirLut; // lulines
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static int bFirInitialized = 0; // initialized?
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static int nFirOrder = FIRLEN; // order (modplug has 4smps pre/post extension, so limit this to 9)
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static float nFirFC = FIRCUT; // cutoff (normalized to pi/2)
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static int nFirCpw = (1L<<FIRCPWBN); // number of precalculted filter lines
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static int nFirUsers = 0; // reference counter
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new macros:
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#define SNDMIX_GETMONOVOL8FIRFILTER
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#define SNDMIX_GETMONOVOL16FIRFILTER
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#define SNDMIX_GETSTEREOVOL8FIRFILTER
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#define SNDMIX_GETSTEREOVOL16FIRFILTER
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new mixer interface macros:
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BEGIN_MIX_INTERFACE(Mono8BitFirFilterMix)
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BEGIN_MIX_INTERFACE(Mono16BitFirFilterMix)
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BEGIN_RAMPMIX_INTERFACE(Mono8BitFirFilterRampMix)
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BEGIN_RAMPMIX_INTERFACE(Mono16BitFirFilterRampMix)
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BEGIN_MIX_INTERFACE(FastMono8BitFirFilterMix)
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BEGIN_MIX_INTERFACE(FastMono16BitFirFilterMix)
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BEGIN_FASTRAMPMIX_INTERFACE(FastMono8BitFirFilterRampMix)
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BEGIN_FASTRAMPMIX_INTERFACE(FastMono16BitFirFilterRampMix)
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BEGIN_MIX_INTERFACE(Stereo8BitFirFilterMix)
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BEGIN_MIX_INTERFACE(Stereo16BitFirFilterMix)
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BEGIN_RAMPMIX_INTERFACE(Stereo8BitFirFilterRampMix)
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BEGIN_RAMPMIX_INTERFACE(Stereo16BitFirFilterRampMix)
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BEGIN_MIX_FLT_INTERFACE(FilterMono8BitFirFilterMix)
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BEGIN_MIX_FLT_INTERFACE(FilterMono16BitFirFilterMix)
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BEGIN_RAMPMIX_FLT_INTERFACE(FilterMono8BitFirFilterRampMix)
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BEGIN_RAMPMIX_FLT_INTERFACE(FilterMono16BitFirFilterRampMix)
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BEGIN_MIX_STFLT_INTERFACE(FilterStereo8BitFirFilterMix)
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BEGIN_MIX_STFLT_INTERFACE(FilterStereo16BitFirFilterMix)
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BEGIN_RAMPMIX_STFLT_INTERFACE(FilterStereo8BitFirFilterRampMix)
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BEGIN_RAMPMIX_STFLT_INTERFACE(FilterStereo16BitFirFilterRampMix)
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modified:
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const LPMIXINTERFACE gpMixFunctionTable[2*2*16] // to hold new fir mixer interface
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const LPMIXINTERFACE gpFastMixFunctionTable[2*2*16] // to hold new fir mixer interface
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functioN: UINT CSoundFile::CreateStereoMix(int count)
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new:
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if (!(pChannel->dwFlags & CHN_NOIDO))
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{
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// use hq-fir mixer?
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if( ((gdwSoundSetup & (SNDMIX_HQRESAMPLER|SNDMIX_ULTRAHQSRCMODE)) == (SNDMIX_HQRESAMPLER|SNDMIX_ULTRAHQSRCMODE)) ||
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((gdwSoundSetup & (SNDMIX_HQRESAMPLER)) == (SNDMIX_HQRESAMPLER)) )
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nFlags += MIXNDX_FIRMIXERSRC;
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else
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nFlags += MIXNDX_LINEARSRC; // use
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}
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was:
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if (!(pChannel->dwFlags & CHN_NOIDO))
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{
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nFlags += MIXNDX_LINEARSRC; // use
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}
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