76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <unordered_set>
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#include <clap/clap.h>
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namespace clap { namespace helpers {
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class NoteEndQueue {
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public:
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explicit NoteEndQueue(std::size_t initialBucketSize = 19)
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: _voicesToKill(initialBucketSize) {}
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void onNoteOn(int32_t noteId, int16_t port, int16_t channel, int16_t key) {
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assert(checkValidEntry(noteId, port, channel, key));
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_voicesToKill.erase(Entry(noteId, port, channel, key));
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}
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void onNoteEnd(int32_t noteId, int16_t port, int16_t channel, int16_t key) {
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assert(checkValidEntry(noteId, port, channel, key));
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_voicesToKill.insert(Entry(noteId, port, channel, key));
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}
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void flush(const clap_output_events *out) {
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clap_event_note ev;
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ev.velocity = 0;
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ev.header.flags = 0;
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ev.header.size = sizeof(ev);
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ev.header.space_id = CLAP_CORE_EVENT_SPACE_ID;
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ev.header.time = 0; // time is irrelevant here
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ev.header.type = CLAP_EVENT_NOTE_END;
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for (auto &e : _voicesToKill) {
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ev.port_index = e._port;
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ev.channel = e._channel;
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ev.key = e._key;
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ev.note_id = e._noteId;
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out->try_push(out, &ev.header);
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}
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_voicesToKill.clear();
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}
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private:
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bool checkValidEntry(int32_t noteId, int16_t port, int16_t channel, int16_t key) {
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assert(noteId >= -1);
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assert(port >= 0);
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assert(channel >= 0 && channel < 16);
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assert(key >= 0 && key < 127);
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return true;
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}
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struct Entry {
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constexpr Entry(int32_t noteId, int16_t port, int16_t channel, int16_t key)
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: _noteId(noteId), _port(port), _channel(channel), _key(key) {}
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constexpr bool operator==(const Entry &o) const noexcept {
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return _port == o._port && _channel == o._channel && _key == o._key;
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}
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const int32_t _noteId;
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const int16_t _port;
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const int16_t _channel;
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const int16_t _key;
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};
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struct EntryHash {
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std::size_t operator()(const Entry &e) const noexcept {
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return e._key ^ (e._channel << 8) ^ (e._port << 16) ^ (int64_t(e._noteId) << 32LL);
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}
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};
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std::unordered_set<Entry, EntryHash> _voicesToKill;
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};
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}} // namespace clap::helpers
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