static void
open_mixer (MokoAlsaVolumeControl *self)
{
MokoAlsaVolumeControlPrivate *priv = ALSA_VOLUME_CONTROL_PRIVATE (self);
if (snd_mixer_open (&priv->mixer_handle, 0) != 0) {
g_warning ("Failed to get mixer handle");
priv->mixer_handle = NULL;
return;
}
snd_mixer_set_callback (priv->mixer_handle, mixer_event_cb);
snd_mixer_set_callback_private (priv->mixer_handle, self);
g_debug ("Opened mixer");
}
static int
_mixer_callback_del(E_Mixer_System *self,
struct e_mixer_callback_desc *desc)
{
Ecore_Fd_Handler *handler;
EINA_LIST_FREE(desc->handlers, handler)
ecore_main_fd_handler_del(handler);
snd_mixer_set_callback_private(self, NULL);
memset(desc, 0, sizeof(*desc));
free(desc);
return 1;
}
static int
_mixer_callback_add(E_Mixer_System *self,
int (*func)(void *data, E_Mixer_System *self),
void *data)
{
struct e_mixer_callback_desc *desc;
struct pollfd *pfds;
int len;
len = snd_mixer_poll_descriptors_count(self);
if (len <= 0)
return 0;
desc = malloc(sizeof(struct e_mixer_callback_desc));
if (!desc)
return 0;
desc->func = func;
desc->data = data;
desc->self = self;
desc->idler = NULL;
desc->handlers = NULL;
pfds = alloca(len * sizeof(struct pollfd));
len = snd_mixer_poll_descriptors(self, pfds, len);
if (len <= 0)
{
free(desc);
return 0;
}
while (len > 0)
{
Ecore_Fd_Handler *fd_handler;
len--;
fd_handler = ecore_main_fd_handler_add(
pfds[len].fd, ECORE_FD_READ, _cb_fd_handler, desc, NULL, NULL);
desc->handlers = eina_list_prepend(desc->handlers, fd_handler);
}
snd_mixer_set_callback_private(self, desc);
return 1;
}
/* First some utils, then the mixer implementation */
static gboolean
gst_alsa_mixer_open (GstAlsaMixer * mixer)
{
gint err;
snd_ctl_t *ctl;
snd_ctl_card_info_t *card_info;
g_return_val_if_fail (mixer->handle == NULL, FALSE);
/* open and initialize the mixer device */
err = snd_mixer_open (&mixer->handle, 0);
if (err < 0 || mixer->handle == NULL)
goto open_failed;
if ((err = snd_mixer_attach (mixer->handle, mixer->device)) < 0) {
GST_WARNING ("Cannot open mixer for sound device '%s': %s", mixer->device,
snd_strerror (err));
goto error;
}
if ((err = snd_mixer_selem_register (mixer->handle, NULL, NULL)) < 0) {
GST_WARNING ("Cannot register mixer elements: %s", snd_strerror (err));
goto error;
}
if ((err = snd_mixer_load (mixer->handle)) < 0) {
GST_WARNING ("Cannot load mixer settings: %s", snd_strerror (err));
goto error;
}
snd_mixer_set_callback_private (mixer->handle, mixer);
snd_mixer_set_callback (mixer->handle, gst_alsa_mixer_handle_callback);
/* now get the device name, any of this is not fatal */
g_free (mixer->cardname);
if ((err = snd_ctl_open (&ctl, mixer->device, 0)) < 0) {
GST_WARNING ("Cannot open CTL: %s", snd_strerror (err));
goto no_card_name;
}
snd_ctl_card_info_malloc (&card_info);
if ((err = snd_ctl_card_info (ctl, card_info)) < 0) {
GST_WARNING ("Cannot get card info: %s", snd_strerror (err));
snd_ctl_close (ctl);
goto no_card_name;
}
mixer->cardname = g_strdup (snd_ctl_card_info_get_name (card_info));
GST_DEBUG ("Card name = %s", GST_STR_NULL (mixer->cardname));
snd_ctl_card_info_free (card_info);
snd_ctl_close (ctl);
no_card_name:
if (mixer->cardname == NULL) {
mixer->cardname = g_strdup ("Unknown");
GST_DEBUG ("Cannot find card name");
}
GST_INFO ("Successfully opened mixer for device '%s'.", mixer->device);
return TRUE;
/* ERROR */
open_failed:
{
GST_WARNING ("Cannot open mixer: %s", snd_strerror (err));
mixer->handle = NULL;
return FALSE;
}
error:
{
snd_mixer_close (mixer->handle);
mixer->handle = NULL;
return FALSE;
}
}
