void asound_setup(const gchar * card, const gchar * channel,
void (*volume_changed)(int,gboolean))
{
// Make sure (for now) that the setup function only gets called once
static int asound_setup_called = 0;
assert(asound_setup_called == 0);
asound_setup_called++;
// Save card, volume_changed
strcpy(m_card, card);
m_volume_changed = volume_changed;
// Load the mixer for the provided cardname
snd_mixer_open(&m_mixer, 0);
snd_mixer_attach(m_mixer, m_card);
snd_mixer_selem_register(m_mixer, NULL, NULL);
snd_mixer_load(m_mixer);
// Setup g_io_watch for the mixer
int count = snd_mixer_poll_descriptors_count(m_mixer);
if(count >= 1)
{
struct pollfd pfd;
count = snd_mixer_poll_descriptors(m_mixer, &pfd, 1);
if(count == 1)
{
GIOChannel * giochannel = g_io_channel_unix_new(pfd.fd);
g_io_add_watch_full(giochannel, G_PRIORITY_DEFAULT,
G_IO_IN, asound_poll_cb, NULL, NULL);
}
}
// Iterate over the elements in the mixer and store them in m_channel_names
int elemcount = snd_mixer_get_count(m_mixer);
snd_mixer_elem_t * elem = snd_mixer_first_elem(m_mixer);
int loop;
for(loop = 0; loop < elemcount; loop++)
{
const char * elemname = snd_mixer_selem_get_name(elem);
if(snd_mixer_selem_has_playback_volume(elem))
{
m_channel_names = g_list_append(m_channel_names,
(gpointer)g_strdup(elemname));
}
elem = snd_mixer_elem_next(elem);
}
// Setup m_elem using the provided channelname
if(channel != NULL && asound_channel_exists(channel))
asound_set_channel(channel);
else if(m_channel_names != NULL)
asound_set_channel((const gchar*)m_channel_names->data);
}
void asound_setup(const gchar * card, const gchar * channel,
void (*volume_changed)(int,gboolean))
{
gchar * card_override = NULL; // used to hold a string like hw:0 if a nice
// device name was given as 'card'
// Clean up resources from previous calls to setup
g_free(m_channel);
m_channel = NULL;
if(m_elem) {
snd_mixer_elem_set_callback(m_elem, NULL);
m_elem = NULL;
}
if(m_mixer) {
snd_mixer_close(m_mixer);
m_mixer = NULL;
}
g_list_free_full(m_channel_names, g_free);
m_channel_names = NULL;
g_list_free_full(m_device_names, g_free);
m_device_names = NULL;
// Save card, volume_changed
g_free(m_device);
m_device = g_strdup(card);
m_volume_changed = volume_changed;
// Populate list of device names
int card_number = -1;
int ret = snd_card_next(&card_number);
snd_ctl_card_info_t * info = NULL;
snd_ctl_card_info_alloca(&info);
m_device_names = g_list_append(m_device_names, (gpointer)g_strdup("default"));
while(ret == 0 && card_number != -1) {
char buf[16];
sprintf(buf, "hw:%d", card_number);
snd_ctl_t * ctl = NULL;
if(snd_ctl_open(&ctl, buf, 0) < 0) {
continue;
}
if(snd_ctl_card_info(ctl, info) < 0) {
snd_ctl_close(ctl);
continue;
}
snd_ctl_close(ctl);
gchar * nice_name = g_strdup(snd_ctl_card_info_get_name(info));
m_device_names = g_list_append(m_device_names, (gpointer)nice_name);
if(g_strcmp0(nice_name, m_device) == 0) {
g_free(card_override);
card_override = g_strdup_printf("hw:%d", card_number);
}
ret = snd_card_next(&card_number);
}
// Load the mixer for the provided cardname
snd_mixer_open(&m_mixer, 0);
if(snd_mixer_attach(m_mixer, (card_override != NULL ? card_override : m_device)) < 0) {
fprintf(stderr, "Failed to open sound device with name: %s\n",
(card_override != NULL ? card_override : m_device));
snd_mixer_close(m_mixer);
m_mixer = NULL;
g_free(card_override);
return;
} else {
g_free(card_override);
}
snd_mixer_selem_register(m_mixer, NULL, NULL);
snd_mixer_load(m_mixer);
// Setup g_io_watch for the mixer
int count = snd_mixer_poll_descriptors_count(m_mixer);
if(count >= 1)
{
struct pollfd pfd;
count = snd_mixer_poll_descriptors(m_mixer, &pfd, 1);
if(count == 1)
{
GIOChannel * giochannel = g_io_channel_unix_new(pfd.fd);
g_io_add_watch_full(giochannel, G_PRIORITY_DEFAULT,
G_IO_IN | G_IO_ERR , asound_poll_cb, NULL, NULL);
}
}
// Iterate over the elements in the mixer and store them in m_channel_names
int elemcount = snd_mixer_get_count(m_mixer);
snd_mixer_elem_t * elem = snd_mixer_first_elem(m_mixer);
int loop;
for(loop = 0; loop < elemcount; loop++)
{
const char * elemname = snd_mixer_selem_get_name(elem);
if(snd_mixer_selem_has_playback_volume(elem))
{
m_channel_names = g_list_append(m_channel_names,
(gpointer)g_strdup(elemname));
}
elem = snd_mixer_elem_next(elem);
}
// Setup m_elem using the provided channelname
if(channel != NULL && asound_channel_exists(channel))
asound_set_channel(channel);
else if(m_channel_names != NULL)
asound_set_channel((const gchar*)m_channel_names->data);
}