MIDI-related structs

MAX_PORT_NAME_LEN

A constant that defines a maximum port name length

struct MIDI_port

A structure that contains names and numbers related to a certain MIDI port in Alsa.

unsigned int id

MIDI port number; related to iteration in port_info function and its port_number argument

char client_info_name[128]

A name of ALSA’s snd_seq_client_info_t container. Can be redefined as char pointer later, but MIDI_port will need a destructor.

char port_info_name[128]

A name of ALSA’s snd_seq_port_info_t container. Can be redefined as char pointer later, but MIDI_port will need a destructor.

int port_info_client_id

A client id of ALSA’s snd_seq_port_info_t container

int port_info_id

A port id of ALSA’s snd_seq_port_info_t container

struct RMR_Port_config

A structure that initializes a port. It contains a port type, names for seq interface, queue tempo and ppq for input queues.

struct MIDI_message

A struct to store a single MIDI message in a form of a buffer, its length and a timestamp.

unsigned char *buf

Same as bytes, but just an allocated array

long count

Length of buf

double timestamp

Time in seconds elapsed since the previous message

struct Alsa_MIDI_data

A structure to hold variables related to the ALSA API implementation.

int *seq

A pointer to Alsa MIDI sequencer handle

unsigned int port_num

Seems to be a MIDI port number that is only set to “-1” now.

int vport

A receiver or sender port number, generated by snd_seq_create_simple_port()

int *subscription

A pointer to ALSA port subscription container instance

int *coder

A pointer to Alsa MIDI sequencer event parser

unsigned int buffer_size

A bufsize value for MIDI event parser (snd_midi_event_new()).

unsigned char *buffer

A MIDI message buffer.

pthread_t thread

An input thread instance

pthread_t dummy_thread_id

The ID of the calling thread generated by a pthread_self() function

int last_time

snd_seq_real_time_t instance decoded from Alsa MIDI event, contains nanosecond and second values

int queue_id

An input queue is needed to get timestamped events

int trigger_fds[2]

File descriptors set by a pipe call in “start_input_seq” function.

int port_connected

Tells if a MIDI port is connected, set by open_port()

struct MIDI_in_data

A struct to be passed to a pthread_create() call.

int *midi_async_queue

A GLib asynchronous que to store MIDI messages

int *error_async_queue

A GLib asynchronous que to store errors

MIDI_message message

A MIDI_message instance

unsigned char ignore_flags

?

int do_input

Marks if data input thread was started

int first_message

?

int using_callback

Marks if a callback is used; set by set_MIDI_in_callback()

MIDI_callback user_callback

Current MIDI callback pointer to be called on a message

void *user_data

Additional data passed to a callback, seems to always be a void pointer

int continue_sysex

Determines if previous message should be extended or a new array should be created

Alsa_MIDI_data *amidi_data

Alsa_MIDI_data instance