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https://github.com/alsa-project/alsa-utils
synced 2025-01-09 14:06:45 +01:00
alsactl: Add monitor command
With monitor command, you can monitor the events received from the given control device. Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
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7d0c2801b3
commit
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4 changed files with 86 additions and 2 deletions
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@ -7,7 +7,7 @@ man_MANS += alsactl_init.7
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endif
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endif
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EXTRA_DIST=alsactl.1 alsactl_init.xml
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EXTRA_DIST=alsactl.1 alsactl_init.xml
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alsactl_SOURCES=alsactl.c state.c lock.c utils.c init_parse.c daemon.c
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alsactl_SOURCES=alsactl.c state.c lock.c utils.c init_parse.c daemon.c monitor.c
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alsactl_CFLAGS=$(AM_CFLAGS) -D__USE_GNU -DSYS_ASOUNDRC=\"$(ASOUND_STATE_DIR)/asound.state\" -DSYS_PIDFILE=\"$(ALSACTL_PIDFILE_DIR)/alsactl.pid\"
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alsactl_CFLAGS=$(AM_CFLAGS) -D__USE_GNU -DSYS_ASOUNDRC=\"$(ASOUND_STATE_DIR)/asound.state\" -DSYS_PIDFILE=\"$(ALSACTL_PIDFILE_DIR)/alsactl.pid\"
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noinst_HEADERS=alsactl.h list.h init_sysdeps.c init_utils_string.c init_utils_run.c init_sysfs.c
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noinst_HEADERS=alsactl.h list.h init_sysdeps.c init_utils_string.c init_utils_run.c init_sysfs.c
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@ -6,6 +6,8 @@ alsactl \- advanced controls for ALSA soundcard driver
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\fBalsactl\fP [\fIoptions\fP] [\fIstore\fP|\fIrestore\fP|\fIinit\fP] <card # or id or device>
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\fBalsactl\fP [\fIoptions\fP] [\fIstore\fP|\fIrestore\fP|\fIinit\fP] <card # or id or device>
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\fBalsactl\fP \fImonitor\fP <card # or id>
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.SH DESCRIPTION
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.SH DESCRIPTION
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\fBalsactl\fP is used to control advanced settings for the ALSA
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\fBalsactl\fP is used to control advanced settings for the ALSA
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soundcard drivers. It supports multiple soundcards. If your card has
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soundcard drivers. It supports multiple soundcards. If your card has
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@ -34,8 +36,12 @@ is not known, error code 99 is returned.
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\fIkill\fP notifies the daemon to do the specified operation (quit,
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\fIkill\fP notifies the daemon to do the specified operation (quit,
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rescan, save_and_quit).
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rescan, save_and_quit).
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\fImonitor\fP is for monitoring the events received from the given
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control device.
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If no soundcards are specified, setup for all cards will be saved or
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If no soundcards are specified, setup for all cards will be saved or
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loaded.
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loaded (except for \fImonitor\fP command that can handle only a single
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card; it selects the card "default" when unspecified).
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.SH OPTIONS
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.SH OPTIONS
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@ -100,6 +100,7 @@ static struct arg args[] = {
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{ CARDCMD, "daemon", "store state periodically for one or each soundcards" },
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{ CARDCMD, "daemon", "store state periodically for one or each soundcards" },
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{ CARDCMD, "rdaemon", "like daemon but do the state restore at first" },
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{ CARDCMD, "rdaemon", "like daemon but do the state restore at first" },
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{ KILLCMD, "kill", "notify daemon to quit, rescan or save_and_quit" },
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{ KILLCMD, "kill", "notify daemon to quit, rescan or save_and_quit" },
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{ CARDCMD, "monitor", "monitor control events" },
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{ 0, NULL, NULL }
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{ 0, NULL, NULL }
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};
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};
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@ -363,6 +364,8 @@ int main(int argc, char *argv[])
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res = state_daemon(cfgfile, cardname, period, pidfile);
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res = state_daemon(cfgfile, cardname, period, pidfile);
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} else if (!strcmp(cmd, "kill")) {
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} else if (!strcmp(cmd, "kill")) {
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res = state_daemon_kill(pidfile, cardname);
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res = state_daemon_kill(pidfile, cardname);
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} else if (!strcmp(cmd, "monitor")) {
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res = monitor(cardname);
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} else {
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} else {
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fprintf(stderr, "alsactl: Unknown command '%s'...\n", cmd);
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fprintf(stderr, "alsactl: Unknown command '%s'...\n", cmd);
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res = -ENODEV;
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res = -ENODEV;
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75
alsactl/monitor.c
Normal file
75
alsactl/monitor.c
Normal file
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@ -0,0 +1,75 @@
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/*
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* Advanced Linux Sound Architecture Control Program
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "aconfig.h"
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#include "version.h"
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#include <stdio.h>
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#include <alsa/asoundlib.h>
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int monitor(const char *name)
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{
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snd_ctl_t *ctl;
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snd_ctl_event_t *event;
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int err;
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if (!name)
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name = "default";
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err = snd_ctl_open(&ctl, name, SND_CTL_READONLY);
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if (err < 0) {
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fprintf(stderr, "Cannot open ctl %s\n", name);
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return err;
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}
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err = snd_ctl_subscribe_events(ctl, 1);
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if (err < 0) {
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fprintf(stderr, "Cannot open subscribe events to ctl %s\n", name);
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snd_ctl_close(ctl);
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return err;
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}
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snd_ctl_event_alloca(&event);
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while (snd_ctl_read(ctl, event) > 0) {
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unsigned int mask;
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if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
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continue;
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printf("#%d (%i,%i,%i,%s,%i)",
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snd_ctl_event_elem_get_numid(event),
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snd_ctl_event_elem_get_interface(event),
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snd_ctl_event_elem_get_device(event),
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snd_ctl_event_elem_get_subdevice(event),
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snd_ctl_event_elem_get_name(event),
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snd_ctl_event_elem_get_index(event));
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mask = snd_ctl_event_elem_get_mask(event);
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if (mask & SND_CTL_EVENT_MASK_VALUE)
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printf(" VALUE");
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if (mask & SND_CTL_EVENT_MASK_INFO)
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printf(" INFO");
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if (mask & SND_CTL_EVENT_MASK_ADD)
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printf(" ADD");
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if (mask & SND_CTL_EVENT_MASK_TLV)
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printf(" TLV");
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if (mask == SND_CTL_EVENT_MASK_REMOVE)
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printf(" REMOVE");
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printf("\n");
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}
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snd_ctl_close(ctl);
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return 0;
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}
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