6c53f87076
that:
a) runs alsactl restore if there is a saved config b) unmutes playback
channels if there isn't
#132575
148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
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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 <alsa/asoundlib.h>
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#define ALSA_CONFIG_PATH "/etc/asound.state"
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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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int run_alsactl(int index)
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{
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char *args[] = { "/sbin/alsactl", "restore", NULL, NULL };
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char num[10];
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sprintf(num,"%d",index);
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args[2] = num;
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execv(args[0],args);
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return 1;
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}
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int frob_mixer(int index)
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{
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int rc = 0;
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char card[32];
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snd_mixer_t *handle;
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snd_mixer_selem_id_t *sid;
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snd_mixer_elem_t *elem;
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snd_mixer_selem_id_alloca(&sid);
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sprintf(card,"hw:%d",index);
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if ((rc = snd_mixer_open(&handle, 0)) < 0) {
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return rc;
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}
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if ((rc = snd_mixer_attach(handle, card)) < 0) {
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goto out;
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}
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if ((rc = snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
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goto out;
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}
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rc = snd_mixer_load(handle);
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if (rc < 0) {
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goto out;
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}
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for (elem = snd_mixer_first_elem(handle); elem; elem = snd_mixer_elem_next(elem)) {
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long pmin, pmax;
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int c;
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snd_mixer_selem_get_id(elem, sid);
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snd_mixer_selem_get_playback_volume_range(elem, &pmin, &pmax);
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for (c = 0; c < SND_MIXER_SCHN_LAST; c++) {
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if (snd_mixer_selem_has_capture_channel(elem, c)) {
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if (snd_mixer_selem_has_capture_volume(elem))
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snd_mixer_selem_set_capture_volume(elem, c, 0);
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if (!strcmp(snd_mixer_selem_id_get_name(sid),"CD")) {
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if (snd_mixer_selem_has_capture_switch(elem))
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snd_mixer_selem_set_capture_switch(elem, c, 1);
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} else {
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if (snd_mixer_selem_has_capture_switch(elem))
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snd_mixer_selem_set_capture_switch(elem, c, 0);
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if (snd_mixer_selem_has_playback_switch(elem))
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snd_mixer_selem_set_playback_switch(elem, c, 0);
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if (snd_mixer_selem_has_playback_volume(elem))
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snd_mixer_selem_set_playback_volume(elem, c, 0);
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}
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}
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if (snd_mixer_selem_has_playback_channel(elem, c)) {
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if (!snd_mixer_selem_has_capture_channel(elem, c) ||
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!strcmp(snd_mixer_selem_id_get_name(sid),"CD")) {
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if (snd_mixer_selem_has_playback_switch(elem))
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snd_mixer_selem_set_playback_switch(elem, c, 1);
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if (snd_mixer_selem_has_playback_volume(elem))
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snd_mixer_selem_set_playback_volume(elem, c, pmin + (pmax - pmin) * 0.75);
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}
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}
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}
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}
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out:
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snd_mixer_close(handle);
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return rc;
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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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i = get_card_number();
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if (i < 0)
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return 0;
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if (has_config(i))
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return run_alsactl(i);
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else
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return frob_mixer(i);
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}
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