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https://github.com/alsa-project/alsa-lib.git
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Added aconnect example..
This commit is contained in:
Jaroslav Kysela
parent
b38a572356
commit
a234679700
3 changed files with 259 additions and 1 deletions
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@ -1,5 +1,5 @@
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check_PROGRAMS=control mixer switches pause pcm latency seq \
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playmidi1 timer loopback
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playmidi1 timer loopback aconnect
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control_LDADD=../src/libasound.la
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mixer_LDADD=../src/libasound.la
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@ -11,6 +11,7 @@ seq_LDADD=../src/libasound.la
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playmidi1_LDADD=../src/libasound.la
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timer_LDADD=../src/libasound.la
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loopback_LDADD=../src/libasound.la
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aconnect_LDADD=../src/libasound.la
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INCLUDES=-I$(top_srcdir)/include
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CFLAGS=-static -Wall -pipe -g
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47
test/README.aconnect
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47
test/README.aconnect
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@ -0,0 +1,47 @@
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================================================================
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aconnect - control subscriptions
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ver.0.1
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Copyright (C) 1999 Takashi Iwai
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================================================================
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aconnect is a utility to control subscriptions of two ports as the
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third "manager" client.
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For example, the following connects two ports, from 64:0 to 65:0.
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% aconnect 64:0 65:0
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To disconnect the existing subscription, use -d option.
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% aconnect -d 64:0 65:0
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To see which port is available as input port, run the following
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command:
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% aconnect -i
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client 0: 'System' [group=system] [type=kernel]
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0 'Timer ' [group=system]
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1 'Announce ' [group=system]
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client 64: '0: MIDI Synth' [group=] [type=kernel]
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0 'card 0: synth-midi: 0' [group=device]
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Similary, to see the output ports, use -o flag.
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% aconnect -o
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client 64: '0: MIDI Synth' [group=] [type=kernel]
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0 'card 0: synth-midi: 0' [group=device]
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client 65: 'AWE Wave Table Synth : 0' [group=device] [type=kernel]
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0 'Emu8000 port 0 ' [group=device]
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1 'Emu8000 port 1 ' [group=device]
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2 'Emu8000 port 2 ' [group=device]
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3 'Emu8000 port 3 ' [group=device]
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Some ports may have permission for its own group.
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In such a case, change the group of aconnect to the appropriate one by
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using -g option.
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The option -D specifies the sequencer device file (as default,
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/dev/snd/seq). Usually, you don't have to change it.
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The option -q specifies the queue number. The argument must be a
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valid queue number, usually from 0 to 7.
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210
test/aconnect.c
Normal file
210
test/aconnect.c
Normal file
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@ -0,0 +1,210 @@
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/*
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* connect / disconnect two subscriber ports
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* ver.0.1
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*
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* Copyright (C) 1999 Takashi Iwai
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/asound.h>
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#include <linux/asequencer.h>
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#define DEVICE_FILE "/dev/snd/seq"
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#define DEFAULT_QUEUE 0
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static void usage(void)
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{
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fprintf(stderr, "connect / disconnect two subscriber ports\n");
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fprintf(stderr, "copyright (C) 1999 Takashi Iwai\n");
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fprintf(stderr, "usage: aconnect [-d] [-q queue] [-g group] sender receiver\n");
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fprintf(stderr, " -d = disconnect\n");
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fprintf(stderr, " sender, receiver = client:port\n");
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fprintf(stderr, " aconnect -i [-g group]\n");
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fprintf(stderr, " list input ports\n");
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fprintf(stderr, " aconnect -o [-g group]\n");
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fprintf(stderr, " list output ports\n");
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}
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static void parse_address(snd_seq_addr_t *addr, char *arg)
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{
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char *p;
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addr->client = atoi(arg);
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if ((p = strchr(arg, ':')) != NULL)
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addr->port = atoi(p + 1);
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else
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addr->port = 0;
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}
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static int check_permission(snd_seq_port_info_t *pinfo, char *group, int perm)
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{
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if ((pinfo->capability & perm) == perm &&
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! (pinfo->capability & SND_SEQ_PORT_CAP_NO_EXPORT))
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return 1;
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if (*group && strcmp(pinfo->group, group) == 0 &&
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(pinfo->cap_group & perm) == perm &&
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! (pinfo->cap_group & SND_SEQ_PORT_CAP_NO_EXPORT))
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return 1;
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return 0;
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}
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/*
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* list all ports
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*/
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static void list_ports(int fd, char *group, int perm)
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{
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snd_seq_client_info_t cinfo;
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snd_seq_port_info_t pinfo;
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int client_printed;
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cinfo.client = -1;
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cinfo.name[0] = 0;
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cinfo.group[0] = 0;
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while (ioctl(fd, SND_SEQ_IOCTL_QUERY_NEXT_CLIENT, &cinfo) >= 0) {
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/* reset query info */
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pinfo.client = cinfo.client;
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pinfo.port = -1;
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pinfo.name[0] = 0;
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strncpy(pinfo.group, group, sizeof(pinfo.group));
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client_printed = 0;
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while (ioctl(fd, SND_SEQ_IOCTL_QUERY_NEXT_PORT, &pinfo) >= 0) {
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if (check_permission(&pinfo, group, perm)) {
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if (! client_printed) {
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printf("client %d: '%s' [group=%s] [type=%s]\n",
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cinfo.client, cinfo.name, cinfo.group,
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(cinfo.type == USER_CLIENT ? "user" : "kernel"));
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client_printed = 1;
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}
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printf(" %3d '%-16s' [group=%s]\n", pinfo.port, pinfo.name, pinfo.group);
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}
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/* reset query names */
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pinfo.name[0] = 0;
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strncpy(pinfo.group, group, sizeof(pinfo.group));
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}
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/* reset query names */
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cinfo.name[0] = 0;
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cinfo.group[0] = 0;
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}
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}
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enum {
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SUBSCRIBE, UNSUBSCRIBE, LIST_INPUT, LIST_OUTPUT
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};
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int main(int argc, char **argv)
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{
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int c, fd;
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int queue = DEFAULT_QUEUE;
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int command = SUBSCRIBE;
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char *device = DEVICE_FILE;
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char *group = "";
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int client;
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snd_seq_client_info_t cinfo;
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snd_seq_port_subscribe_t subs;
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while ((c = getopt(argc, argv, "diog:D:q:")) != -1) {
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switch (c) {
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case 'd':
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command = UNSUBSCRIBE;
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break;
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case 'i':
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command = LIST_INPUT;
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break;
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case 'o':
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command = LIST_OUTPUT;
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break;
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case 'g':
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group = optarg;
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break;
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case 'D':
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device = optarg;
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break;
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case 'q':
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queue = atoi(optarg);
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break;
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default:
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usage();
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exit(1);
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}
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}
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if ((fd = open(device, O_RDWR)) < 0) {
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fprintf(stderr, "can't open sequencer\n");
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return 1;
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}
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if (command == LIST_INPUT) {
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list_ports(fd, group, SND_SEQ_PORT_CAP_IN|SND_SEQ_PORT_CAP_SUBS_IN);
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return 0;
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} else if (command == LIST_OUTPUT) {
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list_ports(fd, group, SND_SEQ_PORT_CAP_OUT|SND_SEQ_PORT_CAP_SUBS_OUT);
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return 0;
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}
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if (optind + 2 > argc) {
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usage();
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exit(1);
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}
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if (ioctl(fd, SND_SEQ_IOCTL_CLIENT_ID, &client) < 0) {
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fprintf(stderr, "can't get client id\n");
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return 1;
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}
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/* set client info */
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memset(&cinfo, 0, sizeof(cinfo));
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cinfo.client = client;
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cinfo.type = USER_CLIENT;
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strcpy(cinfo.name, "ALSA Connector");
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strncpy(cinfo.group, group, sizeof(cinfo.group) - 1);
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if (ioctl(fd, SND_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo) < 0) {
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fprintf(stderr, "can't set client info\n");
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return 0;
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}
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/* set subscription */
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parse_address(&subs.sender, argv[optind]);
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parse_address(&subs.dest, argv[optind + 1]);
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subs.sender.queue = subs.dest.queue = queue;
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subs.exclusive = 0;
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subs.realtime = 0;
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if (command == UNSUBSCRIBE) {
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if (ioctl(fd, SND_SEQ_IOCTL_GET_SUBSCRIPTION, &subs) < 0) {
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fprintf(stderr, "No subscription is found\n");
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return 1;
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}
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if (ioctl(fd, SND_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs) < 0) {
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fprintf(stderr, "Disconnection failed (errno=%d)\n", errno);
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return 1;
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}
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} else {
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if (ioctl(fd, SND_SEQ_IOCTL_GET_SUBSCRIPTION, &subs) >= 0) {
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fprintf(stderr, "Connection is already subscribed\n");
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return 1;
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}
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if (ioctl(fd, SND_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) < 0) {
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fprintf(stderr, "Connection failed (errno=%d)\n", errno);
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return 1;
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}
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}
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return 0;
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}
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