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| Riga 1: |
Riga 1: |
| − | Mostriamo di seguito un esempio di applicativo che consente la sottoscrizione della connessione delle porte di due Client di Alsa, nonché la successiva disconnessione.
| + | #REDIRECT [[ALSA_e_Gambas:_Connettere_due_Client_mediante_la_sottoscrizione_delle_porte]] |
| − | Private seq As Pointer
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| − | Library "libasound:2"
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| − | Private Const SND_SEQ_OPEN_DUPLEX As Integer = 3
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| − | Private Const SND_SEQ_PORT_CAP_READ As Integer = 1
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| − | Private Const SND_SEQ_PORT_CAP_SUBS_READ As Integer = 32
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| − | <FONT color=gray>' ''int snd_seq_open (snd_seq_t **handle, const char *name, int streams, int mode)''
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| − | ' ''Open the ALSA sequencer.''</font>
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| − | Private Extern snd_seq_open(handle As Pointer, name As String, streams As Integer, mode As Integer) As Integer
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| − | <FONT color=gray>' ''int snd_seq_set_client_name(snd_seq_t * seq, const char * name)''
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| − | ' ''Set client name.''</font>
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| − | Private Extern snd_seq_set_client_name(handle As Pointer, name As String) As Integer
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| − | <FONT color=gray>' ''int snd_seq_client_id(snd_seq_t * seq)''
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| − | ' ''Get the client id.''</font>
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| − | Private Extern snd_seq_client_id(handle As Pointer) As Integer
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| − | <FONT color=gray>' ''int snd_seq_parse_address (snd_seq_t *seq, snd_seq_addr_t *addr, const char *str)''
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| − | ' ''Parse the given string and get the sequencer address.''</font>
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| − | Private Extern snd_seq_parse_address(handle As Pointer, addr As Pointer, charstr As String) As Integer
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| − | <FONT color=gray>' ''int snd_seq_port_subscribe_malloc (snd_seq_port_subscribe_t **ptr)''
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| − | ' ''Allocate an empty snd_seq_port_subscribe_t using standard malloc.''</font>
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| − | Private Extern snd_seq_port_subscribe_malloc(ptr As Pointer) As Integer
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| − | <FONT color=gray>' ''void snd_seq_port_subscribe_set_sender (snd_seq_port_subscribe_t *info, const snd_seq_addr_t *addr)''
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| − | ' ''Set sender address of a port_subscribe container.''</font>
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| − | Private Extern snd_seq_port_subscribe_set_sender(pinfo As Pointer, addr As Pointer)
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| − | <FONT color=gray>' ''void snd_seq_port_subscribe_set_dest (snd_seq_port_subscribe_t *info, const snd_seq_addr_t *addr)
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| − | ' ''Set destination address of a port_subscribe container.''</font>
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| − | Private Extern snd_seq_port_subscribe_set_dest(pinfo As Pointer, addr As Pointer)
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| − | <FONT color=gray>' ''void snd_seq_port_subscribe_set_queue (snd_seq_port_subscribe_t *info, int q)''
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| − | ' ''Set the queue id of a port_subscribe container.''</font>
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| − | Private Extern snd_seq_port_subscribe_set_queue(pinfo As Pointer, qI As Integer)
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| − | <FONT color=gray>' ''void snd_seq_port_subscribe_set_exclusive (snd_seq_port_subscribe_t *info, int val)''
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| − | ' ''Set the exclusive mode of a port_subscribe container.''</font>
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| − | Private Extern snd_seq_port_subscribe_set_exclusive(pinfo As Pointer, vI As Integer)
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| − |
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| − | <FONT color=gray>' ''void snd_seq_port_subscribe_set_time_update (snd_seq_port_subscribe_t *info, int val)''
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| − | ' ''Set the time-update mode of a port_subscribe container.''</font>
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| − | Private Extern snd_seq_port_subscribe_set_time_update(pinfo As Pointer, vI As Integer)
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| − |
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| − | <FONT color=gray>' ''void snd_seq_port_subscribe_set_time_real (snd_seq_port_subscribe_t *info, int val)''
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| − | ' ''Set the real-time mode of a port_subscribe container.''</font>
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| − | Private Extern snd_seq_port_subscribe_set_time_real(pinfo As Pointer, vI As Integer)
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| − | <FONT color=gray>' ''int snd_seq_get_port_subscription (snd_seq_t *handle, snd_seq_port_subscribe_t *sub)''
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| − | ' ''Obtain subscription information.''</font>
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| − | Private Extern snd_seq_get_port_subscription(handle As Pointer, subP As Pointer) As Integer
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| − | <FONT color=gray>' ''int snd_seq_subscribe_port (snd_seq_t *handle, snd_seq_port_subscribe_t *sub)''
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| − | ' ''Subscribe a port connection.''</font>
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| − | Private Extern snd_seq_subscribe_port(handle As Pointer, subP As Pointer) As Integer
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| − | <FONT color=gray>' ''int snd_seq_unsubscribe_port (snd_seq_t *handle, snd_seq_port_subscribe_t *sub)''
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| − | ' ''Unsubscribe a connection between ports.''</font>
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| − | Private Extern snd_seq_unsubscribe_port(handle As Pointer, subP As Pointer) As Integer
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| − | <FONT color=gray>' ''const char * snd_strerror (int errnum)''
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| − | ' ''Returns the message for an error code.''</font>
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| − | Private Extern snd_strerror(err As Integer) As Pointer
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| − | <FONT color=gray>' ''int snd_seq_close (snd_seq_t *handle)''
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| − | ' ''Close the sequencer.''</font>
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| − | Private Extern snd_seq_close(handle As Pointer)
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| − | '''Public''' Sub Main()
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| − | inizializza_Alsa()
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| − | sottoscrizione_Porte()
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| − | chiude_Alsa()
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| − | '''End'''
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| − | '''Private''' Procedure inizializza_Alsa()
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| − | Dim err, id As Integer
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| − | err = snd_seq_open(VarPtr(seq), "default", SND_SEQ_OPEN_DUPLEX, 0)
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| − | If err < 0 Then Error.Raise("Errore nell'apertura di Alsa: " & snd_strerror(err))
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| − | err = snd_seq_set_client_name(seq, "Connessione Porte Client ALSA")
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| − | If err < 0 Then Error.Raise("Imposibile attribuire un nome al programma: " & snd_strerror(err))
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| − | id = snd_seq_client_id(seq)
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| − | If id < 0 Then Error.Raise("Imposibile ottenere un ID del programma: " & snd_strerror(err))
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| − | '''End'''
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| − | '''Private''' Procedure sottoscrizione_Porte()
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| − | Dim err, queue, exclusive As Integer
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| − | Dim sender, dest, convert_time, convert_real As Integer
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| − | Dim subs As Pointer
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| − | <FONT color=gray>' ''Imposta la sottoscrizione delle porte:''</font>
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| − | err = snd_seq_parse_address(seq, VarPtr(sender), Application.Args[Application.Args.Count - 2])
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| − | If err < 0 Then Error.Raise("Indirizzo non vaido del mittente: " & snd_strerror(err))
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| − | err = snd_seq_parse_address(seq, VarPtr(dest), Application.Args[Application.Args.Count - 1])
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| − | If err < 0 Then Error.Raise("Indirizzo non vaido del Client destinatario: " & snd_strerror(err))
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| − | snd_seq_port_subscribe_malloc(VarPtr(subs))
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| − | snd_seq_port_subscribe_set_sender(subs, VarPtr(sender))
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| − | snd_seq_port_subscribe_set_dest(subs, VarPtr(dest))
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| − | snd_seq_port_subscribe_set_queue(subs, queue)
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| − | snd_seq_port_subscribe_set_exclusive(subs, exclusive)
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| − | snd_seq_port_subscribe_set_time_update(subs, convert_time)
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| − | snd_seq_port_subscribe_set_time_real(subs, convert_real)
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| − | <FONT color=gray>' ''Sottoscrizione e cancellazione della sottoscrizione:''</font>
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| − | If Application.Args[1] = "d" Then
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| − | err = snd_seq_get_port_subscription(seq, subs)
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| − | If err < 0 Then Error.Raise("Nessuna sottoscrizione trovata: " & snd_strerror(err))
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| − | err = snd_seq_unsubscribe_port(seq, subs)
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| − | If err < 0 Then Error.Raise("Tentativo di disconnessione fallito: " & snd_strerror(err))
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| − | Print "Disconnessione avvenuta !"
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| − | Else
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| − | err = snd_seq_get_port_subscription(seq, subs)
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| − | If err = 0 Then Error.Raise("La connessione è già sottoscritta: " & snd_strerror(err))
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| − | err = snd_seq_subscribe_port(seq, subs)
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| − | If err < 0 Then Error.Raise("Tentativo di connessione fallito: " & snd_strerror(err))
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| − | Print "Connessione avvenuta !"
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| − | Endif
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| − | '''End'''
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| − | '''Private''' Procedure chiude_Alsa()
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| − | snd_seq_close(seq)
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| − | '''End'''
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| − | Per eseguire il suddetto codice, bisognerà creare il relativo eseguibile "''a riga di comando''". L'eseguibile andrà lanciato da Terminale:
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| − | * per connettere due porte: indicare il numero identificativo del Client che invia i dati Midi e quello della sua porta di uscita, e di seguito il numero identificativo del Client ricevente e quello della sua porta di entrata. Esempio:
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| − | connettore.gambas 14:0 128:0
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| − | * per disconnettere due Client: come il precedente punto premettendo la lettera "d". Esempio:
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| − | connettore.gambas d 14:0 128:0
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