new mini, standalone MIDI beatbox/live looper

This is for experiments with loop sequencing, MIDI region generation and superclock stuff

tools/bb/bb.h

@@ -0,0 +1,79 @@
+#ifndef __bb_h__
+#define __bb_h__
+
+#include <algorithm>
+#include <vector>
+#include <set>
+#include <cstring>
+
+#include <stdint.h>
+
+#include <jack/jack.h>
+
+typedef uint64_t superclock_t;
+
+static const superclock_t superclock_ticks_per_second = 1235025792000; // 2^10 * 3^4 * 5^3 * 7^2 * 11 * 13 * 17
+inline superclock_t superclock_to_samples (superclock_t s, int sr) { return (s * sr) / superclock_ticks_per_second; }
+inline superclock_t samples_to_superclock (int samples, int sr) { return (samples * superclock_ticks_per_second) / sr; }
+
+class BeatBox {
+  public:
+	BeatBox (int sample_rate);
+	~BeatBox ();
+
+	int register_ports (jack_client_t*);
+	int process (int nframes);
+
+	bool running() const { return _running || _start_requested; }
+	void start ();
+	void stop ();
+	void clear ();
+
+	void set_measure_count (int measures);
+	void set_meter (int beats, int beat_type);
+	void set_tempo (float bpm);
+
+	void set_quantize (int divisor);
+
+  private:
+	bool _start_requested;
+	bool _running;
+	int   _measures;
+	float _tempo;
+	int   _meter_beats;
+	int   _meter_beat_type;
+	jack_port_t* _input;
+	jack_port_t* _output;
+	superclock_t  superclock_cnt;
+	superclock_t  last_start;
+
+	int _sample_rate;
+	superclock_t whole_note_superclocks;
+	superclock_t beat_superclocks;
+	superclock_t measure_superclocks;
+	int _quantize_divisor;
+	bool clear_pending;
+
+	struct Event {
+		superclock_t time;
+		size_t       size;
+		unsigned char  buf[24];
+
+		Event () : time (0), size (0) {}
+		Event (jack_nframes_t t, size_t sz, unsigned char* b) : time (t), size (sz) { memcpy (buf, b, std::min (sizeof (buf), sz)); }
+		Event (Event const & other) : time (other.time), size (other.size) { memcpy (buf, other.buf, other.size); }
+	};
+
+	struct EventComparator {
+		bool operator () (Event const * a, Event const * b) const;
+	};
+
+	typedef std::set<Event*,EventComparator> Events;
+	Events _current_events;
+
+	typedef std::vector<Event*> EventPool;
+	EventPool  event_pool;
+};
+
+
+#endif /* __bb_h__ */