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91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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// Multi-channel effects buffer with panning, echo and reverb
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef EFFECTS_BUFFER_H
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#define EFFECTS_BUFFER_H
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#include "Multi_Buffer.h"
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#include <vector>
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// Effects_Buffer uses several buffers and outputs stereo sample pairs.
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class Effects_Buffer : public Multi_Buffer {
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public:
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// nVoices indicates the number of voices for which buffers will be allocated
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// to make Effects_Buffer work as "mix everything to one", nVoices will be 1
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// If center_only is true, only center buffers are created and
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// less memory is used.
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Effects_Buffer( int nVoices = 1, bool center_only = false );
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// Channel Effect Center Pan
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// ---------------------------------
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// 0,5 reverb pan_1
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// 1,6 reverb pan_2
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// 2,7 echo -
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// 3 echo -
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// 4 echo -
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// Channel configuration
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struct config_t {
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double pan_1; // -1.0 = left, 0.0 = center, 1.0 = right
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double pan_2;
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double echo_delay; // msec
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double echo_level; // 0.0 to 1.0
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double reverb_delay; // msec
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double delay_variance; // difference between left/right delays (msec)
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double reverb_level; // 0.0 to 1.0
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bool effects_enabled; // if false, use optimized simple mixer
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config_t();
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};
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// Set configuration of buffer
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virtual void config( const config_t& );
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void set_depth( double );
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public:
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~Effects_Buffer();
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blargg_err_t set_sample_rate( long samples_per_sec, int msec = blip_default_length );
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void clock_rate( long );
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void bass_freq( int );
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void clear();
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channel_t channel( int, int );
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void end_frame( blip_time_t );
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long read_samples( blip_sample_t*, long );
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long samples_avail() const;
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private:
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typedef long fixed_t;
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int max_voices;
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enum { max_buf_count = 7 };
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std::vector<Blip_Buffer> bufs;
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enum { chan_types_count = 3 };
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std::vector<channel_t> chan_types;
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config_t config_;
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long stereo_remain;
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long effect_remain;
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int buf_count;
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bool effects_enabled;
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std::vector<std::vector<blip_sample_t> > reverb_buf;
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std::vector<std::vector<blip_sample_t> > echo_buf;
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std::vector<int> reverb_pos;
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std::vector<int> echo_pos;
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struct {
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fixed_t pan_1_levels [2];
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fixed_t pan_2_levels [2];
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int echo_delay_l;
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int echo_delay_r;
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fixed_t echo_level;
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int reverb_delay_l;
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int reverb_delay_r;
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fixed_t reverb_level;
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} chans;
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void mix_mono( blip_sample_t*, blargg_long );
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void mix_stereo( blip_sample_t*, blargg_long );
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void mix_enhanced( blip_sample_t*, blargg_long );
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void mix_mono_enhanced( blip_sample_t*, blargg_long );
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};
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#endif
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