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