linux利用asound控制音量

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#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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