mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-11-10 00:05:42 +01:00
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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static int open_ctl(const char *name, snd_ctl_t **ctlp)
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{
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snd_ctl_t *ctl;
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int err;
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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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*ctlp = ctl;
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return 0;
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}
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static int print_event(int card, snd_ctl_t *ctl)
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{
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snd_ctl_event_t *event;
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unsigned int mask;
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int err;
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snd_ctl_event_alloca(&event);
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err = snd_ctl_read(ctl, event);
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if (err < 0)
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return err;
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if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
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return 0;
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if (card >= 0)
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printf("card %d, ", card);
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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_REMOVE) {
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printf(" REMOVE\n");
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return 0;
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}
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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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printf("\n");
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return 0;
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}
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#define MAX_CARDS 256
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int monitor(const char *name)
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{
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snd_ctl_t *ctls[MAX_CARDS];
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int ncards = 0;
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int show_cards;
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int i, err = 0;
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if (!name) {
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int card = -1;
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while (snd_card_next(&card) >= 0 && card >= 0) {
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char cardname[16];
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if (ncards >= MAX_CARDS) {
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fprintf(stderr, "alsactl: too many cards\n");
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err = -E2BIG;
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goto error;
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}
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sprintf(cardname, "hw:%d", card);
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err = open_ctl(cardname, &ctls[ncards]);
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if (err < 0)
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goto error;
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ncards++;
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}
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show_cards = 1;
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} else {
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err = open_ctl(name, &ctls[0]);
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if (err < 0)
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goto error;
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ncards++;
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show_cards = 0;
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}
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for (;ncards > 0;) {
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struct pollfd fds[ncards];
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for (i = 0; i < ncards; i++)
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snd_ctl_poll_descriptors(ctls[i], &fds[i], 1);
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err = poll(fds, ncards, -1);
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if (err <= 0) {
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err = 0;
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break;
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}
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for (i = 0; i < ncards; i++) {
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unsigned short revents;
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snd_ctl_poll_descriptors_revents(ctls[i], &fds[i], 1,
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&revents);
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if (revents & POLLIN)
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print_event(show_cards ? i : -1, ctls[i]);
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}
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}
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error:
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for (i = 0; i < ncards; i++)
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snd_ctl_close(ctls[i]);
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return err;
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}
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