annotate snes_spc/SPC_Filter.h @ 8:a37863126396

reordered error messages
author Robert McIntyre <rlm@mit.edu>
date Fri, 21 Oct 2011 07:26:53 -0700
parents e38dacceb958
children
rev   line source
rlm@0 1 // Simple low-pass and high-pass filter to better match sound output of a SNES
rlm@0 2
rlm@0 3 // snes_spc 0.9.0
rlm@0 4 #ifndef SPC_FILTER_H
rlm@0 5 #define SPC_FILTER_H
rlm@0 6
rlm@0 7 #include "blargg_common.h"
rlm@0 8
rlm@0 9 struct SPC_Filter {
rlm@0 10 public:
rlm@0 11
rlm@0 12 // Filters count samples of stereo sound in place. Count must be a multiple of 2.
rlm@0 13 typedef short sample_t;
rlm@0 14 void run( sample_t* io, int count );
rlm@0 15
rlm@0 16 // Optional features
rlm@0 17
rlm@0 18 // Clears filter to silence
rlm@0 19 void clear();
rlm@0 20
rlm@0 21 // Sets gain (volume), where gain_unit is normal. Gains greater than gain_unit
rlm@0 22 // are fine, since output is clamped to 16-bit sample range.
rlm@0 23 enum { gain_unit = 0x100 };
rlm@0 24 void set_gain( int gain );
rlm@0 25
rlm@0 26 // Sets amount of bass (logarithmic scale)
rlm@0 27 enum { bass_none = 0 };
rlm@0 28 enum { bass_norm = 8 }; // normal amount
rlm@0 29 enum { bass_max = 31 };
rlm@0 30 void set_bass( int bass );
rlm@0 31
rlm@0 32 public:
rlm@0 33 SPC_Filter();
rlm@0 34 BLARGG_DISABLE_NOTHROW
rlm@0 35 private:
rlm@0 36 enum { gain_bits = 8 };
rlm@0 37 int gain;
rlm@0 38 int bass;
rlm@0 39 struct chan_t { int p1, pp1, sum; };
rlm@0 40 chan_t ch [2];
rlm@0 41 };
rlm@0 42
rlm@0 43 inline void SPC_Filter::set_gain( int g ) { gain = g; }
rlm@0 44
rlm@0 45 inline void SPC_Filter::set_bass( int b ) { bass = b; }
rlm@0 46
rlm@0 47 #endif