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livetrax/libs/ardouralsautil/devicelist.cc

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/*
* Copyright (C) 2014-2019 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <alsa/asoundlib.h>
#include <glib.h>
#include "pbd/string_convert.h"
#include "ardouralsautil/devicelist.h"
using namespace std;
void
ARDOUR::get_alsa_audio_device_names (std::map<std::string, std::string>& devices, AlsaDuplex duplex)
{
snd_ctl_t *handle;
snd_ctl_card_info_t *info;
snd_pcm_info_t *pcminfo;
snd_ctl_card_info_alloca(&info);
snd_pcm_info_alloca(&pcminfo);
string devname;
int cardnum = -1;
int device = -1;
const char* fixed_name;
if ((fixed_name = g_getenv ("ARDOUR_ALSA_DEVICE"))) {
devices.insert (make_pair<string,string> (fixed_name, fixed_name));
return;
}
assert (duplex > 0);
while (snd_card_next (&cardnum) >= 0 && cardnum >= 0) {
devname = "hw:";
devname += PBD::to_string (cardnum);
if (snd_ctl_open (&handle, devname.c_str(), 0) >= 0 && snd_ctl_card_info (handle, info) >= 0) {
if (snd_ctl_card_info (handle, info) < 0) {
continue;
}
string card_name = snd_ctl_card_info_get_name (info);
bool have_multiple_subdevices = false;
while (snd_ctl_pcm_next_device (handle, &device) >= 0 && device >= 0) {
/* only detect duplex devices here. more
* complex arrangements are beyond our scope
*/
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 && (duplex & HalfDuplexIn)) {
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 && (duplex & HalfDuplexOut)) {
continue;
}
/* prefer hardware ID (not card/device number) */
string hwname = "hw:";
hwname += snd_ctl_card_info_get_id (info);
hwname += ',';
hwname += PBD::to_string (device);
if (false /* list first subdevice only */) {
devices.insert (std::make_pair (card_name, hwname));
continue;
}
string uniq_name = card_name;
if (have_multiple_subdevices) {
uniq_name += " (" + hwname + ")";
}
std::pair<std::map<std::string, std::string>::iterator, bool> rv;
rv = devices.insert (std::make_pair (uniq_name, hwname));
if (!rv.second) {
assert (!have_multiple_subdevices);
have_multiple_subdevices = true;
uniq_name += " (" + hwname + ")";
devices.insert (std::make_pair (uniq_name, hwname));
#if 0 // disabled (blame the_CLA's laptop)
/* It may happen that the soundcard has multiple sub-devices for playback
* but none for recording.
*
* In that case the playback device-name has a suffix "(0)" while
* the capture device has none.
*
* This causes issues for backends that use
* ::match_input_output_devices_or_none()
*
* (the alternative would be to always add a suffix,
* and the proper solution would be to compare the hw:name)
*/
/* remname the previous entry */
hwname = devices[card_name];
devices.erase (devices.find (card_name));
size_t se = hwname.find_last_of (',');
assert (se != string::npos);
uniq_name = card_name + " (" + hwname.substr (se + 1) + ")";
devices.insert (std::make_pair (uniq_name, hwname));
#endif
}
}
snd_ctl_close(handle);
}
}
}
static void
insert_unique_device_name (std::map<std::string, std::string>& devices, std::string const& card_name, std::string const& devname, int caps)
{
assert (caps != 0);
std::pair<std::map<std::string, std::string>::iterator, bool> rv;
char cnt = '2';
std::string cn = card_name;
/* Add numbers first this is be independent of physical ID (sequencer vs rawmidi).
* If this fails (>= 10 devices) add the device-name for uniqness
*
* XXX: Perhaps this is a bad idea, and `devname` should always be added if
* there is more than one device with the same name.
*/
do {
cn += " (";
if (caps & SND_SEQ_PORT_CAP_READ) cn += "I";
if (caps & SND_SEQ_PORT_CAP_WRITE) cn += "O";
cn += ")";
rv = devices.insert (std::make_pair (cn, devname));
cn = card_name + " [" + cnt + "]";
} while (!rv.second && ++cnt <= '9');
if (!rv.second) {
cn = card_name + " [" + devname + "] (";
if (caps & SND_SEQ_PORT_CAP_READ) cn += "I";
if (caps & SND_SEQ_PORT_CAP_WRITE) cn += "O";
cn += ")";
rv = devices.insert (std::make_pair (cn, devname));
assert (rv.second == true);
}
}
void
ARDOUR::get_alsa_rawmidi_device_names (std::map<std::string, std::string>& devices)
{
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);
if (snd_ctl_open (&handle, devname.c_str (), 0) >= 0 && snd_ctl_card_info (handle, cinfo) >= 0) {
int device = -1;
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::string card_name = snd_rawmidi_info_get_name (info);
int caps = 0;
if (sub < subs_in) caps |= SND_SEQ_PORT_CAP_READ;
if (sub < subs_out) caps |= SND_SEQ_PORT_CAP_WRITE;
insert_unique_device_name (devices, card_name, devname, caps);
break;
} else {
devname = "hw:";
devname += snd_ctl_card_info_get_id (cinfo);
devname += ",";
devname += PBD::to_string (device);
devname += ",";
devname += PBD::to_string (sub);
int caps = 0;
if (sub < subs_in) caps |= SND_SEQ_PORT_CAP_READ;
if (sub < subs_out) caps |= SND_SEQ_PORT_CAP_WRITE;
insert_unique_device_name (devices, sub_name, devname, caps);
}
}
}
snd_ctl_close (handle);
}
}
}
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void
ARDOUR::get_alsa_sequencer_names (std::map<std::string, std::string>& devices)
{
snd_seq_t *seq= NULL;
snd_seq_client_info_t *cinfo;
snd_seq_port_info_t *pinfo;
snd_seq_client_info_alloca (&cinfo);
snd_seq_port_info_alloca (&pinfo);
if (snd_seq_open (&seq, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
return;
}
snd_seq_client_info_set_client(cinfo, -1);
while (snd_seq_query_next_client (seq, cinfo) >= 0) {
int client = snd_seq_client_info_get_client (cinfo);
if (client == SND_SEQ_CLIENT_SYSTEM) {
continue;
}
if (!strcmp (snd_seq_client_info_get_name(cinfo), "Midi Through")) {
continue;
}
snd_seq_port_info_set_client (pinfo, client);
snd_seq_port_info_set_port (pinfo, -1);
while (snd_seq_query_next_port (seq, pinfo) >= 0) {
int caps = snd_seq_port_info_get_capability(pinfo);
if (0 == (caps & (SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_WRITE))) {
continue;
}
if (caps & SND_SEQ_PORT_CAP_NO_EXPORT) {
continue;
}
std::string card_name;
card_name = snd_seq_port_info_get_name (pinfo);
std::string devname;
devname = PBD::to_string(snd_seq_port_info_get_client (pinfo));
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devname += ":";
devname += PBD::to_string(snd_seq_port_info_get_port (pinfo));
insert_unique_device_name (devices, card_name, devname, caps);
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}
}
snd_seq_close (seq);
}
int
ARDOUR::card_to_num(const char* device_name)
{
char* ctl_name;
const char * comma;
snd_ctl_t* ctl_handle;
int i = -1;
if (strncasecmp(device_name, "plughw:", 7) == 0) {
device_name += 4;
}
if (!(comma = strchr(device_name, ','))) {
ctl_name = strdup(device_name);
} else {
ctl_name = strndup(device_name, comma - device_name);
}
if (snd_ctl_open (&ctl_handle, ctl_name, 0) >= 0) {
snd_ctl_card_info_t *card_info;
snd_ctl_card_info_alloca (&card_info);
if (snd_ctl_card_info(ctl_handle, card_info) >= 0) {
i = snd_ctl_card_info_get_card(card_info);
}
snd_ctl_close(ctl_handle);
}
free(ctl_name);
return i;
}