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/*
* sndctl - a plugin for the Video Disk Recorder
* file: alsa.c
* description: handling of the Alsa API
*
* author: Thomas Hildebrandt <toxym@web.de>
*
* inspired by and reengineered from 'avolctl'
* thanks to Martin Prochnow <nordlichtl@martins-kabuff.de>
*/
#include "defaults.h"
#include "alsa.h"
/*********************************************************
* member functions for class cAlsa
*********************************************************/
/*
* constructors
*/
cAlsa::cAlsa(){
init();
}
/*
* destructor
*/
cAlsa::~cAlsa(){
}
/*
* Initialize mapCardNameToHwNumber and mapCardNumberToMixerHandle
*/
static void dumpErrorMessage(string msg, int err)
{
msg.append(snd_strerror(err));
dsyslog(msg.c_str());
}
void cAlsa::init( void ) {
char hwName[64];
snd_ctl_card_info_t *info;
snd_ctl_card_info_malloc(&info);
snd_ctl_t *ctl;
snd_hctl_t *hctl;
int err;
int number = -1;
for (;;) {
/* open card for getting the mixers of this card */
err = snd_card_next(&number);
if (err < 0) {
dumpErrorMessage(string("sndctl (cAlsa::init): ERROR: Cannot get next card number because "), err);
break;
}
if (number < 0)
break;
sprintf(hwName, "hw:%d", number);
if ((err = snd_ctl_open(&ctl, hwName, 0)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::init): ERROR: Cannot open card number because "), err);
break;
}
if ((err = snd_ctl_card_info(ctl, info)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::init): ERROR: Cannot get sound card info because "), err);
break;
}
dsyslog("sndctl (cAlsa::init): Found sound card:%s\n", snd_ctl_card_info_get_name(info));
if ((err = snd_hctl_open(&hctl, hwName, 0)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::init): ERROR: Cannot snd_hctl_open because "), err);
break;
}
/* now iterate over the mixers */
if ((err = snd_hctl_load(hctl)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::init): ERROR: Cannot snd_hctl_load because "), err);
}
snd_hctl_elem_t *elem = NULL;
snd_ctl_elem_info_t *elemInfo;
snd_ctl_elem_info_alloca(&elemInfo);
int controlNr = 0;
for (elem = snd_hctl_first_elem(hctl); elem; elem = snd_hctl_elem_next(elem)) {
if ((err = snd_hctl_elem_info(elem, elemInfo)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::init): ERROR: Cannot snd_hctl_elem_info because "), err);
break;
}
if (snd_ctl_elem_info_is_inactive(elemInfo)) {
continue;
}
snd_ctl_elem_id_t *id;
snd_ctl_elem_id_alloca(&id);
snd_hctl_elem_get_id(elem, id);
if (snd_ctl_elem_info_get_type(elemInfo) == SND_CTL_ELEM_TYPE_INTEGER) {
alsacontrol *control = new alsacontrol();
control->min = snd_ctl_elem_info_get_min(elemInfo);
control->max = snd_ctl_elem_info_get_max(elemInfo);
control->soundCardId = string(snd_ctl_card_info_get_name(info));
control->hwName = string(hwName);
// check for a senseful range
if( control->min == 0 && control->max > control->min && control->max > 10 ){
// get name
control->name = string( snd_ctl_elem_id_get_name(id));
control->mixername = string( snd_ctl_elem_id_get_name(id));
control->controlNr = controlNr;
controlNr++;
dsyslog( "sndctl (cAlsa::init): '%s' updated with min=%ld and max=%ld", control->name.c_str(), control->min, control->max );
vControls.push_back(control);
} else {
delete control;
}
} else {
dsyslog("sndctl (cAlsa::init): '%s' has no playback volume", snd_ctl_elem_id_get_name(id));
}
}
snd_hctl_close(hctl);
snd_ctl_close(ctl);
}
snd_ctl_card_info_free(info);
dsyslog("sndctl (cAlsa::init): found %d controls:", vControls.size());
}
/*
* checks for a mixer with a given name
*/
bool cAlsa::IsMixer( string Name ){
snd_mixer_elem_t *elem;
// search in all mixers for 'Name'
for( elem = snd_mixer_first_elem(handle); elem; elem = snd_mixer_elem_next( elem )){
if(( strcmp(snd_mixer_selem_get_name( elem ), Name.c_str()) == 0 ) &&
snd_mixer_selem_is_active( elem ) &&
( snd_mixer_selem_has_playback_volume( elem ) ||
snd_mixer_selem_has_playback_switch( elem )))
return true;
}
// nothing found
return false;
}
/*
* set the volume of all controls
*/
void cAlsa::Volumes( void ){
/* snd_mixer_elem_t *elem;
int i;
snd_mixer_selem_id_t *sid;
snd_mixer_selem_id_malloc( &sid );
*/
// loop over all controls
for(int i = 0; i < vControls.size(); i++ ){
alsacontrol *control = static_cast<alsacontrol*>(vControls[i]);
if( control->volume >= 0 ){
int err;
// get ID from the name
dsyslog("sndctl (cAlsa::Volumes): trying to set control '%s' of card '%s'", control->name.c_str(), control->hwName.c_str());
snd_hctl_t *hctl;
if ((err = snd_hctl_open(&hctl, control->hwName.c_str(), 0)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::Volumes): snd_hctl_open failed because "), err);
break;
}
if ((err = snd_hctl_load(hctl)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::Volumes): snd_hctl_load failed because "), err);
break;
}
snd_ctl_elem_id_t *id;
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
snd_ctl_elem_id_set_name(id, control->mixername.c_str());
snd_hctl_elem_t *elem = snd_hctl_find_elem(hctl, id);
snd_ctl_elem_value_t *ctl;
snd_ctl_elem_value_alloca(&ctl);
snd_ctl_elem_value_set_id(ctl, id);
/* left */
snd_ctl_elem_value_set_integer(ctl, 0, control->volume);
/* right */
snd_ctl_elem_value_set_integer(ctl, 1, control->volume);
if ((err = snd_hctl_elem_write(elem, ctl)) < 0) {
dumpErrorMessage(string("sndctl (cAlsa::Volumes): snd_hctl_elem_write failed because "), err);
break;
}
snd_hctl_close(hctl);
}
}
}
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