2 #define _MIDI_MAPPER_H 1
4 // MIDIMapper is a class that listens for incoming MIDI messages from
5 // mixer controllers (ie., it is not meant to be used with regular
6 // instruments), interprets them according to a device-specific, user-defined
7 // mapping, and calls back into a receiver (typically the MainWindow).
8 // This way, it is possible to control audio functionality using physical
9 // pots and faders instead of the mouse.
18 class MIDIMappingProto;
19 typedef struct snd_seq_addr snd_seq_addr_t;
20 typedef struct snd_seq_event snd_seq_event_t;
21 typedef struct _snd_seq snd_seq_t;
23 // Interface for receiving interpreted controller messages.
24 class ControllerReceiver {
26 // All values are [0.0, 1.0].
27 virtual void set_locut(float value) = 0;
28 virtual void set_limiter_threshold(float value) = 0;
29 virtual void set_makeup_gain(float value) = 0;
31 virtual void set_treble(unsigned bus_idx, float value) = 0;
32 virtual void set_mid(unsigned bus_idx, float value) = 0;
33 virtual void set_bass(unsigned bus_idx, float value) = 0;
34 virtual void set_gain(unsigned bus_idx, float value) = 0;
35 virtual void set_compressor_threshold(unsigned bus_idx, float value) = 0;
36 virtual void set_fader(unsigned bus_idx, float value) = 0;
38 virtual void toggle_locut(unsigned bus_idx) = 0;
39 virtual void toggle_auto_gain_staging(unsigned bus_idx) = 0;
40 virtual void toggle_compressor(unsigned bus_idx) = 0;
41 virtual void clear_peak(unsigned bus_idx) = 0;
46 MIDIMapper(ControllerReceiver *receiver);
47 virtual ~MIDIMapper();
48 void set_midi_mapping(const MIDIMappingProto &new_mapping);
50 const MIDIMappingProto &get_current_mapping() const;
54 void handle_event(snd_seq_t *seq, snd_seq_event_t *event);
55 void subscribe_to_port(snd_seq_t *seq, const snd_seq_addr_t &addr);
56 void match_controller(int controller, int field_number, int bank_field_number, float value, std::function<void(unsigned, float)> func);
57 void match_button(int note, int field_number, int bank_field_number, std::function<void(unsigned)> func);
58 bool bank_mismatch(int bank_field_number);
60 ControllerReceiver *receiver;
61 std::atomic<bool> should_quit{false};
64 mutable std::mutex mapping_mu;
65 std::unique_ptr<MIDIMappingProto> mapping_proto; // Under <mapping_mu>.
66 int num_controller_banks; // Under <mapping_mu>.
67 std::atomic<int> current_controller_bank{0};
69 std::thread midi_thread;
72 bool load_midi_mapping_from_file(const std::string &filename, MIDIMappingProto *new_mapping);
73 bool save_midi_mapping_to_file(const MIDIMappingProto &mapping_proto, const std::string &filename);
75 #endif // !defined(_MIDI_MAPPER_H)