File 0014-alsactl-Add-monitor-command.patch of Package alsa-utils.948
From d2d9b6fc8d20fca1e06fc261ac20fd6cfd8a8d1b Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 26 Nov 2013 11:44:40 +0100
Subject: [PATCH] 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>
---
alsactl/Makefile.am | 2 +-
alsactl/alsactl.1 | 8 +++++-
alsactl/alsactl.c | 3 +++
alsactl/monitor.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 86 insertions(+), 2 deletions(-)
create mode 100644 alsactl/monitor.c
diff --git a/alsactl/Makefile.am b/alsactl/Makefile.am
index bac84eb079dc..b05b09ce287f 100644
--- a/alsactl/Makefile.am
+++ b/alsactl/Makefile.am
@@ -7,7 +7,7 @@ man_MANS += alsactl_init.7
endif
EXTRA_DIST=alsactl.1 alsactl_init.xml
-alsactl_SOURCES=alsactl.c state.c lock.c utils.c init_parse.c daemon.c
+alsactl_SOURCES=alsactl.c state.c lock.c utils.c init_parse.c daemon.c monitor.c
alsactl_CFLAGS=$(AM_CFLAGS) -D__USE_GNU -DSYS_ASOUNDRC=\"$(ASOUND_STATE_DIR)/asound.state\" -DSYS_PIDFILE=\"$(ALSACTL_PIDFILE_DIR)/alsactl.pid\"
noinst_HEADERS=alsactl.h list.h init_sysdeps.c init_utils_string.c init_utils_run.c init_sysfs.c
diff --git a/alsactl/alsactl.1 b/alsactl/alsactl.1
index 45ac8a68f4a8..a11c17cb59e1 100644
--- a/alsactl/alsactl.1
+++ b/alsactl/alsactl.1
@@ -6,6 +6,8 @@ alsactl \- advanced controls for ALSA soundcard driver
\fBalsactl\fP [\fIoptions\fP] [\fIstore\fP|\fIrestore\fP|\fIinit\fP] <card # or id or device>
+\fBalsactl\fP \fImonitor\fP <card # or id>
+
.SH DESCRIPTION
\fBalsactl\fP is used to control advanced settings for the ALSA
soundcard drivers. It supports multiple soundcards. If your card has
@@ -34,8 +36,12 @@ is not known, error code 99 is returned.
\fIkill\fP notifies the daemon to do the specified operation (quit,
rescan, save_and_quit).
+\fImonitor\fP is for monitoring the events received from the given
+control device.
+
If no soundcards are specified, setup for all cards will be saved or
-loaded.
+loaded (except for \fImonitor\fP command that can handle only a single
+card; it selects the card "default" when unspecified).
.SH OPTIONS
diff --git a/alsactl/alsactl.c b/alsactl/alsactl.c
index 75baad856b5d..6bc013f467d0 100644
--- a/alsactl/alsactl.c
+++ b/alsactl/alsactl.c
@@ -100,6 +100,7 @@ static struct arg args[] = {
{ CARDCMD, "daemon", "store state periodically for one or each soundcards" },
{ CARDCMD, "rdaemon", "like daemon but do the state restore at first" },
{ KILLCMD, "kill", "notify daemon to quit, rescan or save_and_quit" },
+{ CARDCMD, "monitor", "monitor control events" },
{ 0, NULL, NULL }
};
@@ -363,6 +364,8 @@ int main(int argc, char *argv[])
res = state_daemon(cfgfile, cardname, period, pidfile);
} else if (!strcmp(cmd, "kill")) {
res = state_daemon_kill(pidfile, cardname);
+ } else if (!strcmp(cmd, "monitor")) {
+ res = monitor(cardname);
} else {
fprintf(stderr, "alsactl: Unknown command '%s'...\n", cmd);
res = -ENODEV;
diff --git a/alsactl/monitor.c b/alsactl/monitor.c
new file mode 100644
index 000000000000..12d24504264b
--- /dev/null
+++ b/alsactl/monitor.c
@@ -0,0 +1,75 @@
+/*
+ * Advanced Linux Sound Architecture Control Program
+ * Copyright (c) by Takashi Iwai <tiwai@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "aconfig.h"
+#include "version.h"
+#include <stdio.h>
+#include <alsa/asoundlib.h>
+
+int monitor(const char *name)
+{
+ snd_ctl_t *ctl;
+ snd_ctl_event_t *event;
+ int err;
+
+ if (!name)
+ name = "default";
+
+ err = snd_ctl_open(&ctl, name, SND_CTL_READONLY);
+ if (err < 0) {
+ fprintf(stderr, "Cannot open ctl %s\n", name);
+ return err;
+ }
+ err = snd_ctl_subscribe_events(ctl, 1);
+ if (err < 0) {
+ fprintf(stderr, "Cannot open subscribe events to ctl %s\n", name);
+ snd_ctl_close(ctl);
+ return err;
+ }
+ snd_ctl_event_alloca(&event);
+ while (snd_ctl_read(ctl, event) > 0) {
+ unsigned int mask;
+
+ if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
+ continue;
+
+ printf("#%d (%i,%i,%i,%s,%i)",
+ snd_ctl_event_elem_get_numid(event),
+ snd_ctl_event_elem_get_interface(event),
+ snd_ctl_event_elem_get_device(event),
+ snd_ctl_event_elem_get_subdevice(event),
+ snd_ctl_event_elem_get_name(event),
+ snd_ctl_event_elem_get_index(event));
+
+ mask = snd_ctl_event_elem_get_mask(event);
+ if (mask & SND_CTL_EVENT_MASK_VALUE)
+ printf(" VALUE");
+ if (mask & SND_CTL_EVENT_MASK_INFO)
+ printf(" INFO");
+ if (mask & SND_CTL_EVENT_MASK_ADD)
+ printf(" ADD");
+ if (mask & SND_CTL_EVENT_MASK_TLV)
+ printf(" TLV");
+ if (mask == SND_CTL_EVENT_MASK_REMOVE)
+ printf(" REMOVE");
+ printf("\n");
+ }
+ snd_ctl_close(ctl);
+ return 0;
+}
--
1.8.4.3
