掌機 - Anbernic RG28XX - C/C++ - Volume


main.c

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#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>
 
int main(int argc, char** argv)
{
    int vol = 10;
    snd_mixer_t *mixer = NULL;
    snd_mixer_elem_t *elem = NULL;
    snd_mixer_selem_id_t *sid = NULL;
 
    snd_mixer_open(&mixer, 1);
    snd_mixer_attach(mixer, "default");
    snd_mixer_selem_register(mixer, NULL, NULL);
    snd_mixer_load(mixer);
    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, "lineout volume");
    elem = snd_mixer_find_selem(mixer, sid);
    snd_mixer_selem_set_playback_volume_all(elem, vol);
    snd_mixer_close(mixer);
    return 0;
}

編譯 

$ arm-linux-gcc main.c -o main -lasound