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ALSA backend: device detection

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This commit is contained in:
Robin Gareus 2014-06-03 00:50:26 +02:00
parent d5fa80e01d
commit b050f91323
1 changed files with 103 additions and 14 deletions
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117
libs/backends/alsa/alsa_audiobackend.cc
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@ -81,10 +81,12 @@ AlsaAudioBackend::enumerate_devices () const
{
std::vector<AudioBackend::DeviceStatus> s;
int cardnum = -1;
int device = -1;
snd_ctl_card_info_t *info;
snd_ctl_card_info_alloca (&info);
snd_pcm_info_t *pcminfo;
snd_pcm_info_alloca (&pcminfo);
// TODO re-use code from libs/backends/jack/jack_utils.cc
while (snd_card_next (&cardnum) >= 0 && cardnum >= 0) {
snd_ctl_t *handle;
@ -92,12 +94,32 @@ AlsaAudioBackend::enumerate_devices () const
devname += PBD::to_string (cardnum, std::dec);
if (snd_ctl_open (&handle, devname.c_str(), 0) >= 0 && snd_ctl_card_info (handle, info) >= 0) {
//string card_name = snd_ctl_card_info_get_name (info);
int device = -1;
if (snd_ctl_pcm_next_device (handle, &device) >= 0 && device >= 0) {
s.push_back (DeviceStatus (devname, true));
if (snd_ctl_card_info (handle, info) < 0) {
continue;
}
snd_ctl_close(handle);
std::string card_name = snd_ctl_card_info_get_name (info);
devname = "hw:";
devname += snd_ctl_card_info_get_id (info);
while (snd_ctl_pcm_next_device (handle, &device) >= 0 && device >= 0) {
snd_pcm_info_set_device (pcminfo, device);
snd_pcm_info_set_subdevice (pcminfo, 0);
snd_pcm_info_set_stream (pcminfo, SND_PCM_STREAM_CAPTURE);
if (snd_ctl_pcm_info (handle, pcminfo) < 0) {
continue;
}
snd_pcm_info_set_device (pcminfo, device);
snd_pcm_info_set_subdevice (pcminfo, 0);
snd_pcm_info_set_stream (pcminfo, SND_PCM_STREAM_PLAYBACK);
if (snd_ctl_pcm_info (handle, pcminfo) < 0) {
continue;
}
devname += ',';
devname += PBD::to_string (device, std::dec);
s.push_back (DeviceStatus (devname + " " + card_name, true));
}
snd_ctl_close (handle);
}
}
return s;
@ -276,18 +298,82 @@ void
AlsaAudioBackend::enumerate_midi_devices (std::vector<std::string> &m) const
{
int cardnum = -1;
snd_ctl_card_info_t *cinfo;
snd_ctl_card_info_alloca (&cinfo);
while (snd_card_next (&cardnum) >= 0 && cardnum >= 0) {
snd_ctl_t *handle;
std::string devname = "hw:";
devname += PBD::to_string (cardnum, std::dec);
if (snd_ctl_open (&handle, devname.c_str(), 0) >= 0) {
if (snd_ctl_open (&handle, devname.c_str (), 0) >= 0 && snd_ctl_card_info (handle, cinfo) >= 0) {
int device = -1;
// TODO iterate over sub-devices
if (snd_ctl_rawmidi_next_device (handle, &device) >= 0 && device >= 0) {
m.push_back (devname);
while (snd_ctl_rawmidi_next_device (handle, &device) >= 0 && device >= 0) {
snd_rawmidi_info_t *info;
snd_rawmidi_info_alloca (&info);
snd_rawmidi_info_set_device (info, device);
int subs_in, subs_out;
snd_rawmidi_info_set_stream (info, SND_RAWMIDI_STREAM_INPUT);
if (snd_ctl_rawmidi_info (handle, info) >= 0) {
subs_in = snd_rawmidi_info_get_subdevices_count (info);
} else {
subs_in = 0;
}
snd_rawmidi_info_set_stream (info, SND_RAWMIDI_STREAM_OUTPUT);
if (snd_ctl_rawmidi_info (handle, info) >= 0) {
subs_out = snd_rawmidi_info_get_subdevices_count (info);
} else {
subs_out = 0;
}
const int subs = subs_in > subs_out ? subs_in : subs_out;
if (!subs) {
continue;
}
for (int sub = 0; sub < subs; ++sub) {
snd_rawmidi_info_set_stream (info, sub < subs_in ?
SND_RAWMIDI_STREAM_INPUT :
SND_RAWMIDI_STREAM_OUTPUT);
snd_rawmidi_info_set_subdevice (info, sub);
if (snd_ctl_rawmidi_info (handle, info) < 0) {
continue;
}
const char *sub_name = snd_rawmidi_info_get_subdevice_name (info);
if (sub == 0 && sub_name[0] == '\0') {
devname = "hw:";
devname += snd_ctl_card_info_get_id (cinfo);
devname += ",";
devname += PBD::to_string (device, std::dec);
devname += " ";
devname += snd_rawmidi_info_get_name (info);
devname += " (";
if (sub < subs_in) devname += "I";
if (sub < subs_out) devname += "O";
devname += ")";
m.push_back (devname);
break;
} else {
devname = "hw:";
devname += snd_ctl_card_info_get_id (cinfo);
devname += ",";
devname += PBD::to_string (device, std::dec);
devname += ",";
devname += PBD::to_string (sub, std::dec);
devname += " ";
devname += sub_name;
devname += " (";
if (sub < subs_in) devname += "I";
if (sub < subs_out) devname += "O";
devname += ")";
m.push_back (devname);
}
}
}
snd_ctl_close(handle);
snd_ctl_close (handle);
}
}
}
@ -348,8 +434,10 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
assert(_rmidi_out.size() == 0);
assert(_pcmi == 0);
_pcmi = new Alsa_pcmi (_capture_device.c_str(), _playback_device.c_str(), 0, _samplerate, _samples_per_period, _periods_per_cycle, 0);
unsigned int pos = _capture_device.find(" ");
_pcmi = new Alsa_pcmi (_capture_device.substr(0, pos).c_str(), _playback_device.substr(0, pos).c_str(), 0, _samplerate, _samples_per_period, _periods_per_cycle, 0);
if (_pcmi->state ()) {
// TODO get detailed error from _pcmi
PBD::error << _("AlsaAudioBackend: failed to open device (see stderr for details).") << endmsg;
delete _pcmi; _pcmi = 0;
return -1;
@ -780,7 +868,8 @@ AlsaAudioBackend::register_system_midi_ports()
else if (_midi_device == _("-All-")) {
enumerate_midi_devices(devices);
} else {
devices.push_back(_midi_device);
unsigned int pos = _midi_device.find(" ");
devices.push_back(_midi_device.substr(0, pos));
}
for (std::vector<std::string>::const_iterator i = devices.begin (); i != devices.end (); ++i) {