/* Gets mixer volume with given type, if left and right channel volume differ,
* then gives the larger one.
* In case of an error returns "-1". */
void get_vol(snd_mixer_elem_t* elem, enum Volume_type volume_type, long int* vol)
{
long int l, r;
if (volume_type == hardware) {
// TODO: check return value (int) for errors
snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &l);
snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_RIGHT, &r);
}
else if (volume_type == decibels) {
// TODO: check return value (int) for errors
snd_mixer_selem_get_playback_dB(elem, SND_MIXER_SCHN_FRONT_LEFT, &l);
snd_mixer_selem_get_playback_dB(elem, SND_MIXER_SCHN_FRONT_RIGHT, &r);
}
else if (volume_type == alsa_percentage) {
double l_norm = get_normalized_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT);
double r_norm = get_normalized_playback_volume(elem, SND_MIXER_SCHN_FRONT_RIGHT);
PD_M("Got alsa_percentage volumes: %g, %g\n", l_norm, r_norm);
l = lround(l_norm*100);
r = lround(r_norm*100);
}
else if (volume_type == hardware_percentage) {
long int min, max;
snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &l);
snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_RIGHT, &r);
long int vol_to_percentage = l >= r ? l : r;
change_range(&vol_to_percentage, min, max, 0, 100, false);
*vol = vol_to_percentage;
return;
}
else {
// Error
l = -1;
r = -1;
}
*vol = l >= r ? l : r;
PD_M("get_vol returns: %li\n", *vol);
}
/* Set volume with given volume_type.
* round_direction: >0 to round up, <0 to round down, 0 to use default lrint
* rounding direction (see fsetround(3)).*/
void set_vol(
snd_mixer_elem_t* elem,
enum Volume_type volume_type,
long int new_vol,
int round_direction)
{
// TODO: possibly add new_vol range check
int err = 0;
if (volume_type == hardware) {
err = snd_mixer_selem_set_playback_volume_all(elem, new_vol);
}
else if (volume_type == decibels) {
err = snd_mixer_selem_set_playback_dB_all(elem, new_vol, round_direction);
}
else if (volume_type == alsa_percentage) {
double new_vol_norm = (double) new_vol / 100;
PD_M("Setting alsa_percentage volume: %g\n", new_vol_norm);
err = set_normalized_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, new_vol_norm, round_direction);
if (err == 0) {
err = set_normalized_playback_volume(elem, SND_MIXER_SCHN_FRONT_RIGHT, new_vol_norm, round_direction);
}
}
else if (volume_type == hardware_percentage) {
long int min, max;
snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
change_range(&new_vol, 0, 100, min, max, false);
err = snd_mixer_selem_set_playback_volume_all(elem, new_vol);
}
else {
fprintf(stderr, "avolt ERROR: set_vol: Unknown volume_type '%i'.\n", volume_type);
err = -1;
}
if (err != 0) {
fprintf(stderr, "avolt ERROR: snd mixer set playback volume failed with new vol '%li' and volume type '%i'.\n", new_vol, volume_type);
}
}
void MGSBRepVecTP::change_range(
bool along_u, //the objective range is along u parameter or v.
const MGInterval& prange
){
change_range(along_u,prange[0].value(), prange[1].value());
}
