void patchbay_init(void)
{
int i;
int nb_active_channels;
snd_ctl_elem_value_t *val;
snd_ctl_elem_value_alloca(&val);
snd_ctl_elem_value_set_interface(val, SND_CTL_ELEM_IFACE_MIXER);
snd_ctl_elem_value_set_name(val, ANALOG_PLAYBACK_ROUTE_NAME);
memset (stream_active, 0, (MAX_OUTPUT_CHANNELS + MAX_SPDIF_CHANNELS) * sizeof(int));
nb_active_channels = 0;
for (i = 0; i < output_channels; i++) {
snd_ctl_elem_value_set_numid(val, 0);
snd_ctl_elem_value_set_index(val, i);
if (snd_ctl_elem_read(ctl, val) < 0)
continue;
stream_active[i] = 1;
nb_active_channels++;
}
output_channels = nb_active_channels;
snd_ctl_elem_value_set_name(val, SPDIF_PLAYBACK_ROUTE_NAME);
nb_active_channels = 0;
for (i = 0; i < spdif_channels; i++) {
snd_ctl_elem_value_set_numid(val, 0);
snd_ctl_elem_value_set_index(val, i);
if (snd_ctl_elem_read(ctl, val) < 0)
continue;
stream_active[i + MAX_OUTPUT_CHANNELS] = 1;
nb_active_channels++;
}
spdif_channels = nb_active_channels;
}
static int check_elems(struct elem_set_trial *trial)
{
snd_ctl_elem_value_t *data;
unsigned int numid;
unsigned int index;
unsigned int i;
int err;
snd_ctl_elem_value_alloca(&data);
snd_ctl_elem_value_set_id(data, trial->id);
numid = snd_ctl_elem_id_get_numid(trial->id);
index = snd_ctl_elem_id_get_index(trial->id);
for (i = 0; i < trial->element_count; ++i) {
snd_ctl_elem_value_set_index(data, index + i);
/*
* In Linux 4.0 or former, ioctl(SNDRV_CTL_IOCTL_ELEM_ADD)
* doesn't fill all of fields for identification.
*/
if (numid > 0)
snd_ctl_elem_value_set_numid(data, numid + i);
err = snd_ctl_elem_read(trial->handle, data);
if (err < 0)
return err;
/* Change members of an element in this element set. */
trial->change_elem_members(trial, data);
err = snd_ctl_elem_write(trial->handle, data);
if (err < 0)
return err;
}
return 0;
}
static int check_audio_route()
{
int err, idx, i;
snd_ctl_t *handle;
const char *route_ctrl_name = "Speaker Function";
snd_ctl_elem_value_t * elem_value;
snd_ctl_elem_info_t *info;
snd_ctl_elem_list_t elist;
snd_ctl_elem_id_t *eid;
snd_ctl_elem_value_alloca(&elem_value);
snd_ctl_elem_info_alloca(&info);
//snd_ctl_elem_value_set_numid(elem_value, 54);
if ((err = snd_ctl_open(&handle, "hw:0", 0)) < 0) {
db_msg("Open control error: %s\n", snd_strerror(err));
goto check_audio_route_err;
}
db_msg("card=%d\n", handle->card);
memset(&elist, 0, sizeof(elist));
if (snd_ctl_elem_list(handle, &elist) < 0) {
db_msg("snd_ctl_elem_list 1 failed\n");
goto check_audio_route_err;
}
eid = calloc(elist.count, sizeof(snd_ctl_elem_id_t));
elist.space = elist.count;
elist.pids = eid;
if (snd_ctl_elem_list(handle, &elist) < 0) {
db_msg("snd_ctl_elem_list 2 failed\n");
goto check_audio_route_err;
}
for (i = 0; i < elist.count; ++i) {
info->id.numid = eid[i].numid;
if ((err = snd_ctl_elem_info(handle, info)) < 0) {
db_msg("Cannot find the given element from control\n");
goto check_audio_route_err;
}
//db_msg("name[%d]=%s\n", i, snd_ctl_elem_info_get_name(info));
if (!strcmp(snd_ctl_elem_info_get_name(info), route_ctrl_name)) {
db_msg("route ctrl found!!!\n");
break;
}
}
snd_ctl_elem_value_set_numid(elem_value, info->id.numid);
if ((err = snd_ctl_elem_read(handle,elem_value)) < 0) {
db_msg("snd_ctl_elem_read error: %s\n", snd_strerror(err));
goto check_audio_route_err;
}
db_msg("numid=%d\n", snd_ctl_elem_value_get_numid(elem_value));
db_msg("name=%s\n", snd_ctl_elem_value_get_name(elem_value));
//to set the new value
snd_ctl_elem_value_set_enumerated(elem_value,0, 1);
if ((err = snd_ctl_elem_write(handle,elem_value)) < 0) {
db_msg("snd_ctl_elem_write error: %s\n", snd_strerror(err));
goto check_audio_route_err;
}
//read it out again to check if we did set the registers.
if ((err = snd_ctl_elem_read(handle,elem_value)) < 0) {
db_msg("snd_ctl_elem_read error: %s\n", snd_strerror(err));
goto check_audio_route_err;
}
db_msg("after: %d\n", snd_ctl_elem_value_get_enumerated(elem_value, 0));
snd_ctl_close(handle);
return 0;
check_audio_route_err:
snd_ctl_close(handle);
return -1;
}
