void AlsaBackend::UpdateDevicesList()
{
Log("AlsaBackend::UpdateDeviceList\n");
DeviceInfo info;
void **hints, **n;
char *name, *descr, *desc;
unsigned devices = 0;
InitDevicesList();
info.SetDevice(devices++, "default", "Default device", "default");
info.type = DeviceInfo::TYPE_PLUG;
info.direction = 0;
PcmPreProbe(info, OUTPUT);
PcmPreProbe(info, INPUT);
devicesList.push_back(info);
// Start with safe alsa detection, list the devices from software config.
snd_config_update();
if (snd_device_name_hint(-1, "pcm", &hints) < 0)
return;
n = hints;
while (*n != NULL) {
name = snd_device_name_get_hint(*n, "NAME");
descr = snd_device_name_get_hint(*n, "DESC");
if (!descr)
desc = (char*)"";
else
{
desc = descr;
for (int i = strlen(desc); i > 0; i--)
if (desc[i-1] == '\n')
desc[i-1] = ' ';
}
if (IgnorePlugin(name))
{
Log("Ignoring ALSA device %s", name);
}
else
{
info.SetDevice(devices++, name, desc, name);
info.type = DeviceInfo::TYPE_PLUG;
info.probed = false;
info.direction = 0;
PcmPreProbe(info, OUTPUT);
PcmPreProbe(info, INPUT);
if (info.direction != 0)
devicesList.push_back(info);
}
if (name != NULL)
free(name);
if (descr != NULL)
free(descr);
n++;
}
snd_device_name_free_hint(hints);
// Continue with new detection, this is a more thorough test with probing device characteristics
enum { IDLEN = 12 };
char hwdev[IDLEN+1];
int card, err, dev;
snd_ctl_t* handle = NULL;
snd_ctl_card_info_t* cardinfo;
snd_pcm_info_t* pcminfo;
snd_ctl_card_info_alloca(&cardinfo);
snd_pcm_info_alloca(&pcminfo);
card = -1;
while (snd_card_next(&card) == 0 && card >= 0)
{
snprintf(hwdev, IDLEN, "hw:%d", card);
err = snd_ctl_open(&handle, hwdev, 0);
if (sc_errcheck(err, "opening control interface", card, -1))
continue;
err = snd_ctl_card_info(handle, cardinfo);
if (sc_errcheck(err, "obtaining card info", card, -1))
{
snd_ctl_close(handle);
continue;
}
Log("Card %d, ID '%s', name '%s'", card, snd_ctl_card_info_get_id(cardinfo), snd_ctl_card_info_get_name(cardinfo));
dev = -1;
if (snd_ctl_pcm_next_device(handle, &dev) < 0)
{
snd_ctl_close(handle);
continue;
}
while (dev >= 0)
{
if (!DevProbe(handle, pcminfo, card, dev, OUTPUT) && !DevProbe(handle, pcminfo, card, dev, INPUT))
{
if (snd_ctl_pcm_next_device(handle, &dev) < 0)
break;
}
snprintf(hwdev, IDLEN, "hw:%d,%d", card, dev);
char strbuf[DEVICE_NAME_MAXLEN];
snprintf(strbuf, DEVICE_NAME_MAXLEN, "%s, %s", snd_ctl_card_info_get_name(cardinfo), snd_pcm_info_get_name(pcminfo));
info.SetDevice(devices++, hwdev, strbuf, hwdev);
info.type = DeviceInfo::TYPE_HW;
info.probed = false;
info.direction = 0;
PcmPreProbe(info, OUTPUT);
PcmPreProbe(info, INPUT);
Log("**********\n%s :: %s\n**********\n", info.guid, info.displayName);
devicesList.push_back(info);
if (snd_ctl_pcm_next_device(handle, &dev) < 0)
break;
}
snd_ctl_close(handle);
}
// And complement with chewing a bit on user-defined entries, too.
// from PortAudio
/* Iterate over plugin devices */
snd_config_t *topNode = NULL;
assert(snd_config);
if ((err = snd_config_search(snd_config, "pcm", &topNode)) >= 0)
{
snd_config_iterator_t i, next;
snd_config_for_each(i, next, topNode)
{
const char *tpStr = "unknown", *idStr = NULL;
int err = 0;
snd_config_t *n = snd_config_iterator_entry(i), *tp = NULL;
if ((err = snd_config_search(n, "type", &tp)) < 0)
{
if (-ENOENT != err)
{
Log("plugin list error: %s", snd_strerror(err));
}
}
else
{
snd_config_get_string(tp, &tpStr);
}
snd_config_get_id(n, &idStr);
if (IgnorePlugin(idStr))
{
Log("Ignoring ALSA plugin device %s of type %s", idStr, tpStr);
continue;
}
Log("Found plugin %s of type %s", idStr, tpStr);
info.SetDevice(devices++, idStr, idStr, tpStr);
info.probed = false;
info.direction = 0;
if (strncmp(tpStr, "bluetooth", 9)==0)
info.type = DeviceInfo::TYPE_BLUETOOTH;
else if(strncmp(tpStr, "null", 4) == 0)
{
info.type = DeviceInfo::TYPE_NULL;
// Never need to probe the null device.
info.probed = true;
}
else if(strncmp(tpStr, "unknown", 4) == 0)
info.type = DeviceInfo::TYPE_UNKNOWN;
else
{
info.type = DeviceInfo::TYPE_PLUG;
// No need to preprobe bluetooth, null and unknown(?) types.
PcmPreProbe(info, OUTPUT);
PcmPreProbe(info, INPUT);
}
devicesList.push_back(info);
}
}
