adding modplug

Original commit message from CVS:
adding modplug

1 files changed, 159 insertions, 0 deletions

diff --git a/gst/modplug/libmodplug/changes.txt b/gst/modplug/libmodplug/changes.txt
new file mode 100644
index 00000000..340912f1
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+++ b/gst/modplug/libmodplug/changes.txt
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+changes:

+date = 09-feb-2001 [Markus Fick]

+-> file: fastmix.cpp

+		where: spline creation, spline macros

+		what: added unity gain clamp code, added Quantizer_Bits(shift) preprocessor constants

+		where: fir creation, fir macros

+		what: - removed x<pi/2 condition in coef creation

+		      - added quantizer_bits(shift) preprocessor constants

+		      - set default quantizer bits to 15 instead 14 (scale now 32768 instead 16384)

+		        there should not occure any overflows during fir response calculation because

+		        of the symmetric form of filter and the position of the negative fir coefs

+		      - changed final volume calculation for 16bit samples (quality enhancement)

+

+date = 08-feb-2001 [Markus Fick]

+-> file: sndmix.cpp

+		where: function ReadNote()

+		what: modified behaviour of modplug so that interpolation is only deactivated if

+		      a) the user selects "no interpolation"

+			  b) linear interpolation is set and speed incr. > 0xff00

+			 => if spline or fir is active then we use always interpolation

+

+-> file: fastmix.cpp

+		where: spline macros

+		what: changed spline macros to use precalculated tables (way faster)

+		where: file

+		what: - implemented spline table precalculator

+		      - changed fir precalculator + macros (for higher quality and clearer source)

+		      - added some comments and documentation

+		comment: 

+		  - preprocessor constant: SPLINE_FRACBITS

+		     ) controls quality/memory usage

+			   range is [4..14] inclusive

+			   4 = low quality, low memory usage

+			   14 = highest quality, highest memory usage (1L<<14)*4*2 bytes

+		  - preprocessor constant: WFIR_FRACBITS

+		     ) controls quality/memory usage

+			   range is [4..12] inclusive

+			   4 = low quality, low mu

+			   12 = highest quality, highest memory usage ((1L<<(12+1))+1)*8*2 bytes

+

+date = 07-feb-2001 [Markus Fick]

+-> file: fastmix.cpp

+		where: spline macros

+		what: fixed error in coef calculation

+

+date = 07-feb-2001 [Markus Fick]

+-> file: sndfile.h

+		where: class definition of soundfile 

+		what: removed InitFIR + DoneFIR function prototypes

+-> file: sndfile.cpp

+		function:CSoundFile::CSoundFile()

+		what: [modify] removed call to CSoundFile::InitFIRMixer( )

+

+		function:CSoundFile::~CSoundFile()

+		what: [modify] removed call to CSoundFile::DoneFIRMixer( )

+-> file: fastmix.cpp

+		where: spline macros

+		what: changed formula + added some guard bits to calculation

+

+		where: fir macros + implementation

+		what: - moved CSoundfile::FIR funtions to CzFIR (single instance sfir)

+		      - changed fir macros to support CzFIR class

+

+date = 06-feb-2001 [Markus Fick]

+-> file: fastmix.cpp

+         where: macros

+		 what: - removed fir filter with coef interpolation

+		       - add spline interpolation

+			RM: now modplug->select( SPLINE ) selects spline and

+			        modplug->select( POLYPHASE ) selects 8tap fir filter

+

+date = 05-feb-2001 [Markus Fick]

+-> file: fastmix.cpp

+         where: macros + filter order

+         what: [modify] changed filter order to 8 instead of 10

+

+-> file: fastmix.cpp

+         what: new macros+switch for fir-interpolator with coef interpolation

+

+date = 04-feb-2001 [Markus Fick]

+

+-> file: sndfile.h

+	 where: class CSoundFile (bottom)

+	 what: [add] methods for FIR mixer support

+	             1. int InitFIRInterpolator( );

+				 2. int DoneFIRInterpolator( );

+

+-> file: sndfile.cpp

+     function:CSoundFile::CSoundFile()

+	 what: [modify] add call to CSoundFile::InitFIRMixer( )

+	 

+	 function:CSoundFile::~CSoundFile()

+	 what: [modify] add call to CSoundFile::DoneFIRMixer( )

+

+-> file:  fastmix.cpp

+	 new include: <math.h>

+		why: need it for fir-coef calculation

+     new function: CSoundFile::InitFIRMixer( ) // initializes fir filter lookup (if necessary)

+	 new function: CSoundFile::DoneFIRMixer( ) // decrements ReferenceCounter (for static vars) and deinitializes fir struct (if possible).

+	 new defs:

+		#define FIRCPWBN 10							// log2 of number of precalculated wings (-(1L<<FIRCPWBN)..(1L<<FIRCPWBN))

+		#define FIRLOPOSSHIFT (16-(FIRCPWBN+1))		// shift for lopos of sampleposition -> (16 - FIRCPWBN - 1)

+		#define FIRLEN 9							// number(-1) of multiplications per sample

+		#define FIRCUT 0.90f						// cutoff of filter

+		#define MIXNDX_FIRMIXERSRC  0x20			// src-type for firfilter

+	 new vars:

+		static signed short *cFirLut;				// lulines

+		static int bFirInitialized	= 0;			// initialized?

+		static int nFirOrder		= FIRLEN;		// order (modplug has 4smps pre/post extension, so limit this to 9)

+		static float nFirFC			= FIRCUT;		// cutoff (normalized to pi/2)

+		static int nFirCpw			= (1L<<FIRCPWBN);	// number of precalculted filter lines

+		static int nFirUsers		= 0;			// reference counter

+	 new macros:

+		#define SNDMIX_GETMONOVOL8FIRFILTER

+		#define SNDMIX_GETMONOVOL16FIRFILTER

+		#define SNDMIX_GETSTEREOVOL8FIRFILTER

+		#define SNDMIX_GETSTEREOVOL16FIRFILTER

+	new mixer interface macros:

+		BEGIN_MIX_INTERFACE(Mono8BitFirFilterMix)

+		BEGIN_MIX_INTERFACE(Mono16BitFirFilterMix)

+		BEGIN_RAMPMIX_INTERFACE(Mono8BitFirFilterRampMix)

+		BEGIN_RAMPMIX_INTERFACE(Mono16BitFirFilterRampMix)

+		BEGIN_MIX_INTERFACE(FastMono8BitFirFilterMix)

+		BEGIN_MIX_INTERFACE(FastMono16BitFirFilterMix)

+		BEGIN_FASTRAMPMIX_INTERFACE(FastMono8BitFirFilterRampMix)

+		BEGIN_FASTRAMPMIX_INTERFACE(FastMono16BitFirFilterRampMix)

+		BEGIN_MIX_INTERFACE(Stereo8BitFirFilterMix)

+		BEGIN_MIX_INTERFACE(Stereo16BitFirFilterMix)

+		BEGIN_RAMPMIX_INTERFACE(Stereo8BitFirFilterRampMix)

+		BEGIN_RAMPMIX_INTERFACE(Stereo16BitFirFilterRampMix)

+		BEGIN_MIX_FLT_INTERFACE(FilterMono8BitFirFilterMix)

+		BEGIN_MIX_FLT_INTERFACE(FilterMono16BitFirFilterMix)

+		BEGIN_RAMPMIX_FLT_INTERFACE(FilterMono8BitFirFilterRampMix)

+		BEGIN_RAMPMIX_FLT_INTERFACE(FilterMono16BitFirFilterRampMix)

+		BEGIN_MIX_STFLT_INTERFACE(FilterStereo8BitFirFilterMix)

+		BEGIN_MIX_STFLT_INTERFACE(FilterStereo16BitFirFilterMix)

+		BEGIN_RAMPMIX_STFLT_INTERFACE(FilterStereo8BitFirFilterRampMix)

+		BEGIN_RAMPMIX_STFLT_INTERFACE(FilterStereo16BitFirFilterRampMix)

+	modified:

+		const LPMIXINTERFACE gpMixFunctionTable[2*2*16] // to hold new fir mixer interface

+		const LPMIXINTERFACE gpFastMixFunctionTable[2*2*16] // to hold new fir mixer interface

+		functioN: UINT CSoundFile::CreateStereoMix(int count)

+			new: 

+				if (!(pChannel->dwFlags & CHN_NOIDO))

+				{

+					// use hq-fir mixer?

+					if( ((gdwSoundSetup & (SNDMIX_HQRESAMPLER|SNDMIX_ULTRAHQSRCMODE)) == (SNDMIX_HQRESAMPLER|SNDMIX_ULTRAHQSRCMODE)) ||

+						((gdwSoundSetup & (SNDMIX_HQRESAMPLER)) == (SNDMIX_HQRESAMPLER)) )

+						nFlags += MIXNDX_FIRMIXERSRC;

+					else

+						nFlags += MIXNDX_LINEARSRC; // use 

+				}

+			was:

+				if (!(pChannel->dwFlags & CHN_NOIDO))

+				{

+					nFlags += MIXNDX_LINEARSRC; // use 

+				}

+

+