Ne cedere ineluctabili possimus![]() | Salut,
c'est un code pour intercepter données Midi avec les fonctions externes du subsistema Seq de Alsa.
Avant tout il faut connecter le clavier Midi au système ALSA:
~ $ aconnect 24:0 14:0
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| PRIVATE bo AS BOOLEAN
LIBRARY "libasound:2"
PUBLIC STRUCT snd_seq_event
type AS BYTE
flags AS BYTE
tag AS BYTE
queue AS BYTE
tick_time AS INTEGER
real_time AS INTEGER
source_client AS BYTE
source_port AS BYTE
dest_client AS BYTE
dest_port AS BYTE
channel AS BYTE
note AS BYTE
velocity AS BYTE
off_velocity AS BYTE
param AS INTEGER
value AS INTEGER
END STRUCT
PRIVATE CONST SND_SEQ_OPEN_DUPLEX AS INTEGER = 3
PRIVATE CONST SND_SEQ_PORT_CAP_WRITE AS INTEGER = 2
PRIVATE CONST SND_SEQ_PORT_CAP_SUBS_WRITE AS INTEGER = 64
PRIVATE CONST SND_SEQ_PORT_TYPE_MIDI_GENERIC AS INTEGER = 2
PRIVATE CONST SND_SEQ_PORT_TYPE_APPLICATION AS INTEGER = 1048576
PRIVATE ENUM SND_SEQ_EVENT_NOTEON = 6, SND_SEQ_EVENT_NOTEOFF, SND_SEQ_EVENT_KEYPRESS, SND_SEQ_EVENT_CONTROLLER = 10, SND_SEQ_EVENT_PGMCHANGE
' int snd_seq_open (snd_seq_t **handle, const char *name, int streams, int mode)
' Open the ALSA sequencer.
PRIVATE EXTERN snd_seq_open(handle AS POINTER, name AS STRING, streams AS INTEGER, mode AS INTEGER) AS INTEGER
' int snd_seq_create_simple_port(snd_seq_t* seq, const char* name, unsigned int caps, unsigned int type)
' Create a port - simple version.
PRIVATE EXTERN snd_seq_create_simple_port(seq AS POINTER, name AS STRING, caps AS INTEGER, type AS INTEGER) AS INTEGER
' int snd_seq_connect_from(seq as pointer, myport as integer, src_client as integer, src_port as integer)
' Simple subscription (w/o exclusive & time conversion)
PRIVATE EXTERN snd_seq_connect_from(seq AS POINTER, myport AS INTEGER, src_client AS INTEGER, src_port AS INTEGER) AS INTEGER
' int snd_seq_event_input (snd_seq_t *handle, snd_seq_event_t **ev)
' Retrieve an event from sequencer.
PRIVATE EXTERN snd_seq_event_input(handle AS POINTER, ev AS POINTER) AS INTEGER
' int snd_seq_close (snd_seq_t *handle)
' Close the sequencer.
PRIVATE EXTERN snd_seq_close(handle AS POINTER) AS INTEGER
PUBLIC SUB Main()
DIM seq, po AS POINTER
DIM i AS INTEGER
DIM evento AS Snd_seq_event
seq = Connectio_Alsa()
WHILE bo = FALSE
i = snd_seq_event_input(seq, VarPtr(po))
evento = po
IF i = 0 THEN BREAK
IF IsNull(evento) = FALSE THEN Videre_Eventum(evento)
WAIT 0.01
WEND
snd_seq_close(seq)
PRINT "\nFinis terrae !"
QUIT
END
PRIVATE FUNCTION Connectio_Alsa() AS POINTER
DIM hs AS POINTER
DIM i, porta_in AS INTEGER
i = snd_seq_open(VarPtr(hs), "default", SND_SEQ_OPEN_DUPLEX, 0)
IF i < 0 THEN Error.Raise("Error !")
porta_in = snd_seq_create_simple_port(hs, "gambas", SND_SEQ_PORT_CAP_WRITE OR SND_SEQ_PORT_CAP_SUBS_WRITE, SND_SEQ_PORT_TYPE_MIDI_GENERIC OR SND_SEQ_PORT_TYPE_APPLICATION)
IF porta_in < 0 THEN Error.Raise("Error !")
i = snd_seq_connect_from(hs, porta_in, 14, 0)
IF i < 0 THEN Error.Raise("Error !")
RETURN hs
END
PRIVATE PROCEDURE Videre_Eventum(eventum AS Snd_seq_event)
SELECT CASE eventum.type
CASE SND_SEQ_EVENT_NOTEOFF
WITH eventum
PRINT "Note Off: ", .channel, .note, .velocity
END WITH
CASE SND_SEQ_EVENT_NOTEON
WITH eventum
PRINT "Note On: ", .channel, .note, .velocity
END WITH
CASE SND_SEQ_EVENT_CONTROLLER
WITH eventum
PRINT "Control Change: ", .channel, .param, .value
END WITH
CASE SND_SEQ_EVENT_PGMCHANGE
WITH eventum
PRINT "Program Change: ", .channel, .value
END WITH
END SELECT
END
PUBLIC SUB Application_Read() ' ...pour fermer l'application
DIM s AS STRING
INPUT #File.in, s
IF s = "q" THEN bo = TRUE
END
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