100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
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#ifndef MAPPING_H
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#define MAPPING_H
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#include <string>
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#include <list>
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class Mapping
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{
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public:
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std::string name;
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int channel;
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int ccmsb, cclsb;
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int mrl, mru;
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float crl, cru;
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float latency;
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float adj1;
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float adj2;
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tick_t latency_ticks;
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int cur_mv;
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int last_mv;
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sample_t cur_cv;
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sample_t last_cv;
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tick_t last_tick;
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tick_t since_last_tick;
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Mapping(const char *name,
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int channel, int ccmsb, int cclsb,
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int mrl, int mru, float crl, float cru, float latency) :
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name(name), channel(channel), ccmsb(ccmsb), cclsb(cclsb),
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mrl(mrl), mru(mru), crl(crl), cru(cru), latency(latency),
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cur_mv(0), last_mv(0),
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last_cv(0.0),
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last_tick(0), since_last_tick(0)
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{
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/* Set up adjustment values for converting between
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* MIDI values and CV values for this mapping. This
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* results in scaling equations that are two ops. */
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adj1 = (cru - crl) / (mru - mrl);
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adj2 = (-crl / adj1) + mrl;
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}
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void interp_cvout(tick_t tick)
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{
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cur_cv = to_cv(cur_mv);
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last_tick = tick;
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last_cv = cur_cv;
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}
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void tick_cvout()
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{
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if (last_cv == cur_cv) return;
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since_last_tick++;
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}
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bool tick_cvin()
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{
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since_last_tick++;
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if (last_mv == cur_mv) return false;
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if (since_last_tick < latency_ticks) return false;
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since_last_tick = 0;
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last_mv = cur_mv;
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return true;
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}
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void handle_cvout(int c, int cc, int val, tick_t tick)
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{
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if (c != channel && channel != -1) return;
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if (cc == ccmsb) {
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if (cclsb == -1) {
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cur_mv = val;
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interp_cvout(tick);
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} else {
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cur_mv = val << 7;
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}
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} else if (cc == cclsb) {
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cur_mv |= val;
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interp_cvout(tick);
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}
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}
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inline float to_cv(int mv)
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{
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return (mv - adj2) * adj1;
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}
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inline int to_mv(float cv)
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{
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return cv / adj1 + adj2;
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}
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};
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typedef std::list<Mapping> MappingList;
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#endif // MAPPING_H
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