gst/modplug/libmodplug/changes.txt

   1 changes:\r
   2 date = 09-feb-2001 [Markus Fick]\r
   3 -> file: fastmix.cpp\r
   4                 where: spline creation, spline macros\r
   5                 what: added unity gain clamp code, added Quantizer_Bits(shift) preprocessor constants\r
   6                 where: fir creation, fir macros\r
   7                 what: - removed x<pi/2 condition in coef creation\r
   8                       - added quantizer_bits(shift) preprocessor constants\r
   9                       - set default quantizer bits to 15 instead 14 (scale now 32768 instead 16384)\r
  10                         there should not occure any overflows during fir response calculation because\r
  11                         of the symmetric form of filter and the position of the negative fir coefs\r
  12                       - changed final volume calculation for 16bit samples (quality enhancement)\r
  13 \r
  14 date = 08-feb-2001 [Markus Fick]\r
  15 -> file: sndmix.cpp\r
  16                 where: function ReadNote()\r
  17                 what: modified behaviour of modplug so that interpolation is only deactivated if\r
  18                       a) the user selects "no interpolation"\r
  19                           b) linear interpolation is set and speed incr. > 0xff00\r
  20                          => if spline or fir is active then we use always interpolation\r
  21 \r
  22 -> file: fastmix.cpp\r
  23                 where: spline macros\r
  24                 what: changed spline macros to use precalculated tables (way faster)\r
  25                 where: file\r
  26                 what: - implemented spline table precalculator\r
  27                       - changed fir precalculator + macros (for higher quality and clearer source)\r
  28                       - added some comments and documentation\r
  29                 comment: \r
  30                   - preprocessor constant: SPLINE_FRACBITS\r
  31                      ) controls quality/memory usage\r
  32                            range is [4..14] inclusive\r
  33                            4 = low quality, low memory usage\r
  34                            14 = highest quality, highest memory usage (1L<<14)*4*2 bytes\r
  35                   - preprocessor constant: WFIR_FRACBITS\r
  36                      ) controls quality/memory usage\r
  37                            range is [4..12] inclusive\r
  38                            4 = low quality, low mu\r
  39                            12 = highest quality, highest memory usage ((1L<<(12+1))+1)*8*2 bytes\r
  40 \r
  41 date = 07-feb-2001 [Markus Fick]\r
  42 -> file: fastmix.cpp\r
  43                 where: spline macros\r
  44                 what: fixed error in coef calculation\r
  45 \r
  46 date = 07-feb-2001 [Markus Fick]\r
  47 -> file: sndfile.h\r
  48                 where: class definition of soundfile \r
  49                 what: removed InitFIR + DoneFIR function prototypes\r
  50 -> file: sndfile.cpp\r
  51                 function:CSoundFile::CSoundFile()\r
  52                 what: [modify] removed call to CSoundFile::InitFIRMixer( )\r
  53 \r
  54                 function:CSoundFile::~CSoundFile()\r
  55                 what: [modify] removed call to CSoundFile::DoneFIRMixer( )\r
  56 -> file: fastmix.cpp\r
  57                 where: spline macros\r
  58                 what: changed formula + added some guard bits to calculation\r
  59 \r
  60                 where: fir macros + implementation\r
  61                 what: - moved CSoundfile::FIR funtions to CzFIR (single instance sfir)\r
  62                       - changed fir macros to support CzFIR class\r
  63 \r
  64 date = 06-feb-2001 [Markus Fick]\r
  65 -> file: fastmix.cpp\r
  66          where: macros\r
  67                  what: - removed fir filter with coef interpolation\r
  68                        - add spline interpolation\r
  69                         RM: now modplug->select( SPLINE ) selects spline and\r
  70                                 modplug->select( POLYPHASE ) selects 8tap fir filter\r
  71 \r
  72 date = 05-feb-2001 [Markus Fick]\r
  73 -> file: fastmix.cpp\r
  74          where: macros + filter order\r
  75          what: [modify] changed filter order to 8 instead of 10\r
  76 \r
  77 -> file: fastmix.cpp\r
  78          what: new macros+switch for fir-interpolator with coef interpolation\r
  79 \r
  80 date = 04-feb-2001 [Markus Fick]\r
  81 \r
  82 -> file: sndfile.h\r
  83          where: class CSoundFile (bottom)\r
  84          what: [add] methods for FIR mixer support\r
  85                      1. int InitFIRInterpolator( );\r
  86                                  2. int DoneFIRInterpolator( );\r
  87 \r
  88 -> file: sndfile.cpp\r
  89      function:CSoundFile::CSoundFile()\r
  90          what: [modify] add call to CSoundFile::InitFIRMixer( )\r
  91          \r
  92          function:CSoundFile::~CSoundFile()\r
  93          what: [modify] add call to CSoundFile::DoneFIRMixer( )\r
  94 \r
  95 -> file:  fastmix.cpp\r
  96          new include: <math.h>\r
  97                 why: need it for fir-coef calculation\r
  98      new function: CSoundFile::InitFIRMixer( ) // initializes fir filter lookup (if necessary)\r
  99          new function: CSoundFile::DoneFIRMixer( ) // decrements ReferenceCounter (for static vars) and deinitializes fir struct (if possible).\r
 100          new defs:\r
 101                 #define FIRCPWBN 10                                                     // log2 of number of precalculated wings (-(1L<<FIRCPWBN)..(1L<<FIRCPWBN))\r
 102                 #define FIRLOPOSSHIFT (16-(FIRCPWBN+1))         // shift for lopos of sampleposition -> (16 - FIRCPWBN - 1)\r
 103                 #define FIRLEN 9                                                        // number(-1) of multiplications per sample\r
 104                 #define FIRCUT 0.90f                                            // cutoff of filter\r
 105                 #define MIXNDX_FIRMIXERSRC  0x20                        // src-type for firfilter\r
 106          new vars:\r
 107                 static signed short *cFirLut;                           // lulines\r
 108                 static int bFirInitialized      = 0;                    // initialized?\r
 109                 static int nFirOrder            = FIRLEN;               // order (modplug has 4smps pre/post extension, so limit this to 9)\r
 110                 static float nFirFC                     = FIRCUT;               // cutoff (normalized to pi/2)\r
 111                 static int nFirCpw                      = (1L<<FIRCPWBN);       // number of precalculted filter lines\r
 112                 static int nFirUsers            = 0;                    // reference counter\r
 113          new macros:\r
 114                 #define SNDMIX_GETMONOVOL8FIRFILTER\r
 115                 #define SNDMIX_GETMONOVOL16FIRFILTER\r
 116                 #define SNDMIX_GETSTEREOVOL8FIRFILTER\r
 117                 #define SNDMIX_GETSTEREOVOL16FIRFILTER\r
 118         new mixer interface macros:\r
 119                 BEGIN_MIX_INTERFACE(Mono8BitFirFilterMix)\r
 120                 BEGIN_MIX_INTERFACE(Mono16BitFirFilterMix)\r
 121                 BEGIN_RAMPMIX_INTERFACE(Mono8BitFirFilterRampMix)\r
 122                 BEGIN_RAMPMIX_INTERFACE(Mono16BitFirFilterRampMix)\r
 123                 BEGIN_MIX_INTERFACE(FastMono8BitFirFilterMix)\r
 124                 BEGIN_MIX_INTERFACE(FastMono16BitFirFilterMix)\r
 125                 BEGIN_FASTRAMPMIX_INTERFACE(FastMono8BitFirFilterRampMix)\r
 126                 BEGIN_FASTRAMPMIX_INTERFACE(FastMono16BitFirFilterRampMix)\r
 127                 BEGIN_MIX_INTERFACE(Stereo8BitFirFilterMix)\r
 128                 BEGIN_MIX_INTERFACE(Stereo16BitFirFilterMix)\r
 129                 BEGIN_RAMPMIX_INTERFACE(Stereo8BitFirFilterRampMix)\r
 130                 BEGIN_RAMPMIX_INTERFACE(Stereo16BitFirFilterRampMix)\r
 131                 BEGIN_MIX_FLT_INTERFACE(FilterMono8BitFirFilterMix)\r
 132                 BEGIN_MIX_FLT_INTERFACE(FilterMono16BitFirFilterMix)\r
 133                 BEGIN_RAMPMIX_FLT_INTERFACE(FilterMono8BitFirFilterRampMix)\r
 134                 BEGIN_RAMPMIX_FLT_INTERFACE(FilterMono16BitFirFilterRampMix)\r
 135                 BEGIN_MIX_STFLT_INTERFACE(FilterStereo8BitFirFilterMix)\r
 136                 BEGIN_MIX_STFLT_INTERFACE(FilterStereo16BitFirFilterMix)\r
 137                 BEGIN_RAMPMIX_STFLT_INTERFACE(FilterStereo8BitFirFilterRampMix)\r
 138                 BEGIN_RAMPMIX_STFLT_INTERFACE(FilterStereo16BitFirFilterRampMix)\r
 139         modified:\r
 140                 const LPMIXINTERFACE gpMixFunctionTable[2*2*16] // to hold new fir mixer interface\r
 141                 const LPMIXINTERFACE gpFastMixFunctionTable[2*2*16] // to hold new fir mixer interface\r
 142                 functioN: UINT CSoundFile::CreateStereoMix(int count)\r
 143                         new: \r
 144                                 if (!(pChannel->dwFlags & CHN_NOIDO))\r
 145                                 {\r
 146                                         // use hq-fir mixer?\r
 147                                         if( ((gdwSoundSetup & (SNDMIX_HQRESAMPLER|SNDMIX_ULTRAHQSRCMODE)) == (SNDMIX_HQRESAMPLER|SNDMIX_ULTRAHQSRCMODE)) ||\r
 148                                                 ((gdwSoundSetup & (SNDMIX_HQRESAMPLER)) == (SNDMIX_HQRESAMPLER)) )\r
 149                                                 nFlags += MIXNDX_FIRMIXERSRC;\r
 150                                         else\r
 151                                                 nFlags += MIXNDX_LINEARSRC; // use \r
 152                                 }\r
 153                         was:\r
 154                                 if (!(pChannel->dwFlags & CHN_NOIDO))\r
 155                                 {\r
 156                                         nFlags += MIXNDX_LINEARSRC; // use \r
 157                                 }\r
 158 \r
 159 \r