void on_card_changed(GtkComboBox* box, PrefsData* data) {
gint idx = gtk_combo_box_get_active (GTK_COMBO_BOX(box));
GSList *card = g_slist_nth(cards,idx);
struct acard *c = card->data;
gchar *sel_chan = get_selected_channel(c->name);
fill_channel_combo(c->channels,data->chan_combo,sel_chan);
if (sel_chan)
g_free(sel_chan);
}
void fill_card_combo(GtkWidget *combo, GtkWidget *channels_combo) {
struct acard* c;
GSList *cur_card;
gchar* selected_card;
int fs=0,idx,sidx=0;
GtkTreeIter iter;
GtkListStore* store = GTK_LIST_STORE(gtk_combo_box_get_model
(GTK_COMBO_BOX(combo)));
cur_card = cards;
selected_card = get_selected_card();
idx = 0;
while (cur_card) {
c = cur_card->data;
if (!c->channels) {
cur_card = cur_card->next;
continue;
}
if (selected_card && !strcmp(c->name,selected_card)) {
gchar *sel_chan = get_selected_channel(c->name);
sidx = idx;
fill_channel_combo(c->channels,channels_combo,sel_chan);
fs = 1;
if (sel_chan)
g_free(sel_chan);
}
gtk_list_store_append(store, &iter);
gtk_list_store_set(store, &iter, 0, c->name, -1);
cur_card = cur_card->next;
idx++;
}
if (!fs) {
gchar *sel_chan;
c = cards->data;
sel_chan = get_selected_channel(c->name);
fill_channel_combo(c->channels,channels_combo,sel_chan);
if (sel_chan)
g_free(sel_chan);
}
gtk_combo_box_set_active (GTK_COMBO_BOX (combo),sidx);
if (selected_card)
g_free(selected_card);
}
/**
* Initializes the alsa system by getting the cards
* and channels and setting the io watch for external
* volume changes.
*
* @return 0 on success otherwise negative error code
*/
static int
alsaset(void)
{
char *card_name;
char *channel;
// update list of available cards
DEBUG_PRINT("Getting available cards...");
get_cards();
assert(cards != NULL);
// get selected card
assert(active_card == NULL);
card_name = get_selected_card();
DEBUG_PRINT("Selected card: %s", card_name);
if (card_name) {
active_card = find_card(card_name);
g_free(card_name);
}
// if not available, use the default card
if (!active_card) {
DEBUG_PRINT("Using default soundcard");
active_card = cards->data;
}
// If no playable channels, iterate on card list until a valid card is
// found.
// In most situations, the first card of the list (which is the
// Alsa default card) can be opened.
// However, in some situations the default card may be unavailable.
// For example, when it's an USB DAC, and it's disconnected.
if (!active_card->channels) {
GSList *item;
DEBUG_PRINT("Card '%s' has no playable channels, iterating on card list",
active_card->dev);
for (item = cards; item; item = item->next) {
active_card = item->data;
if (active_card->channels)
break;
}
assert(item != NULL);
}
// open card
DEBUG_PRINT("Opening card '%s'...", active_card->dev);
smixer_options.device = active_card->dev;
handle = open_mixer(active_card->dev, &smixer_options, smixer_level);
assert(handle != NULL);
// Set the channel
// We have to handle the fact that the channel name defined
// in PNMixer configuration is not necessarily valid.
// For example, this may happen when the default alsa soundcard
// is modified. The channel names of the new default card may
// not match the channel names of the previous default card.
assert(elem == NULL);
channel = get_selected_channel(active_card->name);
if (channel) {
snd_mixer_selem_id_t *sid;
snd_mixer_selem_id_alloca(&sid);
snd_mixer_selem_id_set_name(sid, channel);
elem = snd_mixer_find_selem(handle, sid);
g_free(channel);
}
if (elem == NULL) {
elem = snd_mixer_first_elem(handle);
}
assert(elem != NULL);
// Set callback
DEBUG_PRINT("Using channel '%s'", snd_mixer_selem_get_name(elem));
snd_mixer_elem_set_callback(elem, alsa_cb);
// set watch for volume changes
set_io_watch(handle);
return 0;
}