qzdoom/libraries/zmusic/mididevices/music_alsa_state.cpp

173 lines
4.7 KiB
C++

/*
** Provides an implementation of an ALSA sequencer wrapper
**
**---------------------------------------------------------------------------
** Copyright 2020 Petr Mrazek
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include "music_alsa_state.h"
#if defined __linux__ && defined HAVE_SYSTEM_MIDI
#include <alsa/asoundlib.h>
#include <sstream>
EMidiDeviceClass MidiOutDeviceInternal::GetDeviceClass() const
{
if (type & SND_SEQ_PORT_TYPE_SYNTH)
return MIDIDEV_FMSYNTH;
if (type & (SND_SEQ_PORT_TYPE_DIRECT_SAMPLE|SND_SEQ_PORT_TYPE_SAMPLE))
return MIDIDEV_SYNTH;
if (type & (SND_SEQ_PORT_TYPE_MIDI_GENERIC|SND_SEQ_PORT_TYPE_APPLICATION))
return MIDIDEV_MIDIPORT;
// assume FM synth otherwise
return MIDIDEV_FMSYNTH;
}
AlsaSequencer & AlsaSequencer::Get() {
static AlsaSequencer sequencer;
return sequencer;
}
AlsaSequencer::AlsaSequencer() {
Open();
}
AlsaSequencer::~AlsaSequencer() {
Close();
}
bool AlsaSequencer::Open() {
error = snd_seq_open(&handle, "default", SND_SEQ_OPEN_OUTPUT, SND_SEQ_NONBLOCK);
if(error) {
return false;
}
error = snd_seq_set_client_name(handle, "GZDoom");
if(error) {
snd_seq_close(handle);
handle = nullptr;
return false;
}
OurId = snd_seq_client_id(handle);
if (OurId < 0) {
error = OurId;
OurId = -1;
snd_seq_close(handle);
handle = nullptr;
return false;
}
return true;
}
void AlsaSequencer::Close() {
if(!handle) {
return;
}
snd_seq_close(handle);
handle = nullptr;
}
namespace {
bool filter(snd_seq_port_info_t *pinfo)
{
int capability = snd_seq_port_info_get_capability(pinfo);
if(capability & SND_SEQ_PORT_CAP_NO_EXPORT) {
return false;
}
const int writable = (SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE);
if((capability & writable) != writable) {
return false;
}
// TODO: filter based on type here? maybe?
// int type = snd_seq_port_info_get_type(pinfo);
return true;
}
}
int AlsaSequencer::EnumerateDevices() {
if(!handle) {
return 0;
}
snd_seq_client_info_t *cinfo;
snd_seq_port_info_t *pinfo;
snd_seq_client_info_alloca(&cinfo);
snd_seq_port_info_alloca(&pinfo);
int index = 0;
// enumerate clients
snd_seq_client_info_set_client(cinfo, -1);
while (snd_seq_query_next_client(handle, cinfo) >= 0) {
snd_seq_port_info_set_client(pinfo, snd_seq_client_info_get_client(cinfo));
// Ignore 'ALSA oddities' that we don't want to use
int clientID = snd_seq_client_info_get_client(cinfo);
if(clientID < 16) {
continue;
}
snd_seq_port_info_set_port(pinfo, -1);
// enumerate ports
while (snd_seq_query_next_port(handle, pinfo) >= 0) {
if (!filter(pinfo)) {
continue;
}
internalDevices.emplace_back();
auto & itemInternal = internalDevices.back();
itemInternal.ID = index++;
const char *name = snd_seq_port_info_get_name(pinfo);
int portNumber = snd_seq_port_info_get_port(pinfo);
if(!name) {
std::ostringstream out;
out << "MIDI Port " << clientID << ":" << portNumber;
itemInternal.Name = out.str();
}
else {
itemInternal.Name = name;
}
itemInternal.ClientID = clientID;
itemInternal.PortNumber = portNumber;
itemInternal.type = snd_seq_port_info_get_type(pinfo);
}
}
return index;
}
const std::vector<MidiOutDeviceInternal> & AlsaSequencer::GetInternalDevices()
{
return internalDevices;
}
#endif