/*
Init the ALSA library:
- Open the configured device, if none, use default device.
- Search for the routing control
- Search for the ringing and incall routes values
*/
static int utils_alsa_init()
{
if(utils_alsa_hctl)
return 0;
debug("utils_alsa_init: start\n");
int i;
for(i=0;i<UTILS_AUDIO_ROUTE_COUNT;i++)utils_alsa_routes[i]=-1;
char *alsa_control=utils_conf_get_string(UTILS_CONF_GROUP_ACTION_AUDIO,UTILS_CONF_ATTR_ACTION_AUDIO_ALSA_ROUTE_CONTROL_NAME);
char *alsa_route_play=utils_conf_get_string(UTILS_CONF_GROUP_ACTION_AUDIO,UTILS_CONF_ATTR_ACTION_AUDIO_ALSA_ROUTE_CONTROL_RINGING);
char *alsa_route_incall=utils_conf_get_string(UTILS_CONF_GROUP_ACTION_AUDIO,UTILS_CONF_ATTR_ACTION_AUDIO_ALSA_ROUTE_CONTROL_INCALL);
char *alsa_route_speaker=utils_conf_get_string(UTILS_CONF_GROUP_ACTION_AUDIO,UTILS_CONF_ATTR_ACTION_AUDIO_ALSA_ROUTE_CONTROL_SPEAKER);
char *alsa_route_handset=utils_conf_get_string(UTILS_CONF_GROUP_ACTION_AUDIO,UTILS_CONF_ATTR_ACTION_AUDIO_ALSA_ROUTE_CONTROL_HANDSET);
if(!alsa_control)
return 0;
char *alsa_device=utils_conf_get_string(UTILS_CONF_GROUP_ACTION_AUDIO,UTILS_CONF_ATTR_ACTION_AUDIO_ALSA_ROUTE_DEVICE);
int ret=0;
if(alsa_device)
ret = snd_hctl_open(&utils_alsa_hctl, alsa_device, 0);
else
ret = snd_hctl_open(&utils_alsa_hctl, "default", 0);
if(ret){
error("utils_alsa_init: Alsa control device open failed: %s\n", snd_strerror(ret));
goto done;
}
ret = snd_hctl_load(utils_alsa_hctl);
if(ret){
error("utils_alsa_init: Alsa control device load failed\n");
goto done;
}
snd_hctl_elem_t *elem=snd_hctl_first_elem(utils_alsa_hctl);
snd_ctl_elem_info_t *info;
snd_ctl_elem_info_alloca(&info);
while(elem){
const char *name=snd_hctl_elem_get_name(elem);
ret=snd_hctl_elem_info(elem, info);
if(ret){
error("utils_alsa_init: snd_hctl_elem_info for ctrl %s error %s\n", name, snd_strerror(ret));
continue;
}
if(!strcmp(name, alsa_control)){
debug("utils_alsa_init: Found element %s\n", name);
// Find the values
for(i=0; i<snd_ctl_elem_info_get_items(info); i++){
snd_ctl_elem_info_set_item(info, i);
snd_hctl_elem_info(elem, info);
const char *s=snd_ctl_elem_info_get_item_name(info);
debug("utils_alsa_init: check control value %s:%s\n", name, s);
if(alsa_route_play && !strcmp(alsa_route_play, s)){
debug("utils_alsa_init: utils_alsa_route_play=%ud\n", i);
utils_alsa_route_play=i;
}
if(alsa_route_incall && !strcmp(alsa_route_incall, s)){
debug("utils_alsa_init: utils_alsa_route_incall=%ud\n", i);
utils_alsa_route_incall=i;
}
if(alsa_route_speaker && !strcmp(alsa_route_speaker, s)){
debug("utils_alsa_init: alsa_route_speaker=%ud\n", i);
utils_alsa_routes[UTILS_AUDIO_ROUTE_SPEAKER]=i;
}
if(alsa_route_handset && !strcmp(alsa_route_handset, s)){
debug("utils_alsa_init: alsa_route_handset=%ud\n", i);
utils_alsa_routes[UTILS_AUDIO_ROUTE_HANDSET]=i;
}
}
snd_ctl_elem_id_malloc(&utils_alsa_route_elem_id);
snd_ctl_elem_info_get_id(info, utils_alsa_route_elem_id);
utils_alsa_route_elem=elem;
}
elem=snd_hctl_elem_next(elem);
}
if(utils_alsa_route_play==-1)
utils_alsa_route_play=utils_alsa_routes[UTILS_AUDIO_ROUTE_SPEAKER];
if(utils_alsa_route_incall==-1)
utils_alsa_route_incall=utils_alsa_routes[UTILS_AUDIO_ROUTE_HANDSET];
debug("utils_alsa_init: ok\n");
done:
g_free(alsa_device);
return ret;
}
int main()
{
int cardNumber = -1;
int errNum;
char *controlType;
char deviceID[16];
// ------------------------------------------------------------------------
// ALSA control elements.
// ------------------------------------------------------------------------
snd_ctl_t *ctl; // Simple control handle.
snd_ctl_elem_id_t *id; // Simple control element id.
snd_ctl_elem_value_t *control; // Simple control element value.
snd_ctl_elem_type_t type; // Simple control element type.
snd_ctl_elem_info_t *info; // Simple control element info container.
snd_ctl_card_info_t *card; // Simple control card info container.
snd_hctl_t *hctl; // High level control handle;
snd_hctl_elem_t *elem; // High level control element handle.
// ------------------------------------------------------------------------
// Initialise ALSA card and device types.
// ------------------------------------------------------------------------
snd_ctl_card_info_alloca( &card );
snd_ctl_elem_value_alloca( &control );
snd_ctl_elem_id_alloca( &id );
snd_ctl_elem_info_alloca( &info );
// ------------------------------------------------------------------------
// Start card section.
// ------------------------------------------------------------------------
// For each card.
while (1)
{
// Find next card number. If < 0 then returns 1st card.
errNum = snd_card_next( &cardNumber );
if (( errNum < 0 ) || ( cardNumber < 0 )) break;
// Concatenate strings to get card's control interface.
sprintf( deviceID, "hw:%i", cardNumber );
// Try to open card.
if ( snd_ctl_open( &ctl, deviceID, 0 ) < 0 )
{
printf( "Error opening card.\n" );
continue;
}
// Fill control card info element.
if ( snd_ctl_card_info( ctl, card ) < 0 )
{
printf( "Error getting card info.\n" );
continue;
}
// --------------------------------------------------------------------
// Print header block.
// --------------------------------------------------------------------
printf( "\t+-----------------------------" );
printf( "-----------------------------+\n" );
printf( "\t| Card: %d - %-46s |",
cardNumber,
snd_ctl_card_info_get_name( card ));
printf( "\n" );
printf( "\t+--------+------------" );
printf( "+------------------------------------+\n" );
printf( "\t| Device | Type " );
printf( "| Name |\n" );
printf( "\t+--------+------------" );
printf( "+------------------------------------+\n" );
// --------------------------------------------------------------------
// Start control section.
// --------------------------------------------------------------------
// Open an empty high level control.
if ( snd_hctl_open( &hctl, deviceID, 0 ) < 0 )
printf( "Error opening high level control.\n" );
// Load high level control element.
if ( snd_hctl_load( hctl ) < 0 )
printf( "Error loading high level control.\n" );
// --------------------------------------------------------------------
// For each control element.
// --------------------------------------------------------------------
for ( elem = snd_hctl_first_elem( hctl );
elem;
elem = snd_hctl_elem_next( elem ))
{
// Get ID of high level control element.
snd_hctl_elem_get_id( elem, id );
// ----------------------------------------------------------------
// Determine control type.
// ----------------------------------------------------------------
if ( snd_hctl_elem_info( elem, info ) < 0 )
printf( "Can't get control information.\n" );
type = snd_ctl_elem_info_get_type( info );
switch ( type )
{
case SND_CTL_ELEM_TYPE_NONE:
controlType = "None";
break;
case SND_CTL_ELEM_TYPE_BOOLEAN:
controlType = "Boolean";
break;
case SND_CTL_ELEM_TYPE_INTEGER:
controlType = "Integer";
break;
case SND_CTL_ELEM_TYPE_INTEGER64:
controlType = "Integer64";
break;
case SND_CTL_ELEM_TYPE_ENUMERATED:
controlType = "Enumerated";
break;
case SND_CTL_ELEM_TYPE_BYTES:
controlType = "Bytes";
break;
case SND_CTL_ELEM_TYPE_IEC958:
controlType = "IEC958";
break;
default:
controlType = "Not Found";
break;
}
printf( "\t| %-6i | %-10s | %-34s |\n",
snd_hctl_elem_get_numid( elem ),
controlType,
snd_hctl_elem_get_name( elem ));
}
printf( "\t+--------+------------" );
printf( "+------------------------------------+\n\n" );
// --------------------------------------------------------------------
// Tidy up.
// --------------------------------------------------------------------
snd_hctl_close( hctl );
snd_ctl_close( ctl );
}
return 0;
}
