#include <stdio.h>
#include <alsa/asoundlib.h>
#include <stdlib.h>
#include <string.h>
int main(int argc ,char **argv)
{
int volume=99;
if(argc>1)
volume=atoi(argv[1]);
if(volume<0)
volume=0;
if(volume>100)
volume=100;
int unmute, chn;
long al, ar;
snd_mixer_t *mixer;
snd_mixer_elem_t *master_element;
snd_mixer_open(&mixer, 0);
snd_mixer_attach(mixer, "default");
snd_mixer_selem_register(mixer, NULL, NULL);
snd_mixer_load(mixer); /* 取得第一個 element，也就是 Master */
master_element = snd_mixer_first_elem(mixer); /* 設定音量的範圍 0 ~ 100 */
snd_mixer_selem_set_playback_volume_range(master_element, 0, 100); /* 取得 Master 是否靜音 */
snd_mixer_selem_get_playback_switch(master_element, 0, &unmute);
snd_mixer_selem_set_playback_volume(master_element, SND_MIXER_SCHN_FRONT_LEFT, volume);
snd_mixer_selem_set_playback_volume(master_element, SND_MIXER_SCHN_FRONT_RIGHT, volume); /* 將 Master 切換為靜音 */
for (chn=0;chn<=SND_MIXER_SCHN_LAST;chn++) {
snd_mixer_selem_set_playback_switch(master_element, chn, 0);
} /* 將 Master 切換為非靜音 */
for (chn=0;chn<=SND_MIXER_SCHN_LAST;chn++) {
snd_mixer_selem_set_playback_switch(master_element, chn, 1);
} return 0;
}
gcc voice.c -o setvoice -lasound
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