167 lines
3.6 KiB
C
167 lines
3.6 KiB
C
/* Copyright 2007 Red Hat, Inc.
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*
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* Portions extraced from various ALSA code:
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* Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
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* Jaroslav Kysela <perex@suse.cz>
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*
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* This software may be freely redistributed under the terms of the GNU
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* public license.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <alsa/asoundlib.h>
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#define ALSA_CONFIG_PATH "/etc/alsa/asound.state"
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#define ALL_CARDS (-1)
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int get_card_number()
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{
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char *devname, *action;
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action = getenv("ACTION");
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if (!action || strcmp(action, "add"))
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return -1;
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devname = getenv("DEVNAME");
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if (!devname)
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return -1;
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if (!strncmp(devname, "/dev/snd/controlC", 17))
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return atoi(devname + 17);
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if (!strncmp(devname, "/dev/snd/pcmC", 13))
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return atoi(devname + 13);
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return -1;
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}
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int has_config(int index)
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{
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int rc = 0;
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snd_config_t *config, *control;
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snd_input_t *in;
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snd_ctl_t *handle;
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snd_ctl_card_info_t *info;
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const char *id;
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char path[32];
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rc = snd_config_top(&config);
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if (rc < 0)
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goto out;
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rc = snd_input_stdio_open(&in, ALSA_CONFIG_PATH, "r");
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if (rc >= 0) {
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rc = snd_config_load(config, in);
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snd_input_close(in);
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if (rc < 0)
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goto out;
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}
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sprintf(path, "hw:%d", index);
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rc = snd_ctl_open(&handle, path, 0);
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if (rc < 0)
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goto out;
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snd_ctl_card_info_alloca(&info);
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rc = snd_ctl_card_info(handle, info);
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if (rc < 0)
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goto out_close;
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id = snd_ctl_card_info_get_id(info);
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rc = snd_config_searchv(config, &control, "state", id, "control", 0);
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out_close:
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snd_ctl_close(handle);
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out:
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return !rc;
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}
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void load_volume_settings(int index)
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{
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char *args[] = { "/sbin/alsactl", "-f", ALSA_CONFIG_PATH, "restore", NULL, NULL };
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char num[10];
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if(index != ALL_CARDS) {
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snprintf(num, 10, "%d", index);
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args[4] = num;
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}
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execv(args[0], args);
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}
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void save_volume_settings(int index)
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{
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char *args[] = { "/sbin/alsactl", "-f", ALSA_CONFIG_PATH, "store", NULL, NULL };
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char num[10];
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if(index != ALL_CARDS) {
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snprintf(num, 10, "%d", index);
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args[4] = num;
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}
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execv(args[0], args);
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}
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void frob_mixer(int index)
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{
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char tmp[100];
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snprintf(tmp, 100, "%d", index);
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tmp[99] = '\0';
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execl("/bin/alsaunmute","/bin/alsaunmute", tmp, "-v", NULL);
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}
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void banner(void)
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{
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printf("ALSA volume settings handler, Copyright 2007 Red Hat, Inc.\n");
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printf("This software may be freely redistributed under\nthe terms of the GNU public license.\n\n");
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printf("Usage: salsa [options] [card number]\n\n");
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printf(" Options:\n");
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printf(" -l - Load volume settings\n");
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printf(" -s - Save volume settings\n\n");
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printf(" Card number:\n");
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printf(" ## - An affected card. If it isn't specified,\n");
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printf(" configure all installed sound cards.\n\n");
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exit(0);
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}
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int main(int argc, char **argv)
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{
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int i;
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if(argc == 1) {
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i = get_card_number();
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if (i < 0) {
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return 0;
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}
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if (has_config(i)) {
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load_volume_settings(i);
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}
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else {
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frob_mixer(i);
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}
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}
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else if(argc >= 2) {
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int card_number = ALL_CARDS;
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if(argc == 3) {
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card_number = atoi(argv[2]);
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}
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if(argv[1][1] == 'l') {
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load_volume_settings(card_number);
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}
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else if(argv[1][1] == 's') {
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save_volume_settings(card_number);
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}
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else {
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banner();
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}
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}
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return(0);
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}
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