主音量控制 (二)

主音量控制

Turn on/off Mic (Capture)

#include <alsa/asoundlib.h>  <--- libasound2-dev

void SetAlsaMasterMute()
{
    int mute=0;
    long min, max;
    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;
    const char *card = "default";
    const char *selem_name = "Capture";

    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);
 
 snd_mixer_selem_get_capture_switch(elem, 0, &mute);

    if (snd_mixer_selem_has_capture_switch(elem)) {
        snd_mixer_selem_set_capture_switch_all(elem, !mute);
    }

    snd_mixer_close(handle);
}

Turn on/off Sound (Master）

#include <alsa/asoundlib.h>

void SetAlsaMasterMute()
{
    long min, max;

    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;
    const char *card = "default";
    const char *selem_name = "Master";

    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);

    if (snd_mixer_selem_has_playback_switch(elem)) {
        snd_mixer_selem_set_playback_switch_all(elem, 0);
    }

    snd_mixer_close(handle);
}

Compiler: gcc abc.c -o abc -lasound
ref: Here