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authorVolker Fischer <corrados@users.noreply.github.com>2021-02-09 20:32:10 +0100
committerBent Bisballe Nyeng <deva@aasimon.org>2021-02-09 20:32:10 +0100
commit3dd3c332414bfbebd69bfd71a4a3198198525eb6 (patch)
tree9dff61eab647703581c80b1e1b276571586696d7 /drumgizmo
parent9310ffe5959ce4de02204b6cd251d4b4a58c69b9 (diff)
Add ALSA midi input support.
Diffstat (limited to 'drumgizmo')
-rw-r--r--drumgizmo/Makefile.am5
-rw-r--r--drumgizmo/drumgizmoc.cc6
-rw-r--r--drumgizmo/enginefactory.cc9
-rw-r--r--drumgizmo/enginefactory.h9
-rw-r--r--drumgizmo/input/alsamidi.cc196
-rw-r--r--drumgizmo/input/alsamidi.h57
6 files changed, 279 insertions, 3 deletions
diff --git a/drumgizmo/Makefile.am b/drumgizmo/Makefile.am
index b3bca32..7702b2e 100644
--- a/drumgizmo/Makefile.am
+++ b/drumgizmo/Makefile.am
@@ -77,6 +77,10 @@ drumgizmo_SOURCES += input/ossmidi.cc
drumgizmo_CXXFLAGS += -DHAVE_INPUT_OSSMIDI
endif # HAVE_INPUT_OSSMIDI
+if HAVE_INPUT_ALSAMIDI
+drumgizmo_SOURCES += input/alsamidi.cc
+drumgizmo_CXXFLAGS += -DHAVE_INPUT_ALSAMIDI
+endif # HAVE_INPUT_ALSAMIDI
# Only compile jackclient.cc if at least one of the jack modules are included.
if HAVE_OUTPUT_JACKAUDIO
@@ -93,6 +97,7 @@ EXTRA_DIST = \
input/inputdummy.h \
input/test.h \
input/jackmidi.h \
+ input/alsamidi.h \
input/midifile.h \
input/ossmidi.h \
output/alsa.h \
diff --git a/drumgizmo/drumgizmoc.cc b/drumgizmo/drumgizmoc.cc
index 159c533..c6b43f0 100644
--- a/drumgizmo/drumgizmoc.cc
+++ b/drumgizmo/drumgizmoc.cc
@@ -94,6 +94,7 @@ static std::string arguments()
output <<
"Input engine parameters:\n"
" jackmidi: midimap=<midimapfile>\n"
+ " alsamidi: midimap=<midimapfile>\n"
" midifile: file=<midifile>, speed=<tempo> (default 1.0),\n"
" track=<miditrack> (default -1, all tracks)\n"
" midimap=<midimapfile>, loop=<true|false>\n"
@@ -105,7 +106,8 @@ static std::string arguments()
"\n"
"Output engine parameters:\n"
" alsa: dev=<device> (default 'default'), frames=<frames> (default "
- "32)\n"
+ "32),\n"
+ " periods=<periods> (default 3)\n"
" srate=<samplerate> (default 441000)\n"
" oss: dev=<device> (default '/dev/dsp'), srate=<samplerate>,\n"
" max_fragments=<number> (default 4, see man page for more info),\n"
@@ -261,7 +263,7 @@ int main(int argc, char* argv[])
});
opt.add("inputengine", required_argument, 'i',
- "dummy|test|jackmidi|midifile Use said event input engine.",
+ "dummy|test|jackmidi|alsamidi|midifile Use said event input engine.",
[&]()
{
std::string engine = optarg;
diff --git a/drumgizmo/enginefactory.cc b/drumgizmo/enginefactory.cc
index c93607e..6d267c3 100644
--- a/drumgizmo/enginefactory.cc
+++ b/drumgizmo/enginefactory.cc
@@ -49,6 +49,9 @@ EngineFactory::EngineFactory()
#ifdef HAVE_INPUT_JACKMIDI
input.push_back("jackmidi");
#endif
+#ifdef HAVE_INPUT_ALSAMIDI
+ input.push_back("alsamidi");
+#endif
#ifdef HAVE_INPUT_OSS
input.push_back("oss");
#endif
@@ -118,6 +121,12 @@ std::unique_ptr<AudioInputEngine> EngineFactory::createInput(const std::string&
return std::make_unique<JackMidiInputEngine>(*jack);
}
#endif
+#ifdef HAVE_INPUT_ALSAMIDI
+ if(name == "alsamidi")
+ {
+ return std::make_unique<AlsaMidiInputEngine>();
+ }
+#endif
#ifdef HAVE_INPUT_OSSMIDI
if(name == "ossmidi")
{
diff --git a/drumgizmo/enginefactory.h b/drumgizmo/enginefactory.h
index 0b37c6e..7dbc9b3 100644
--- a/drumgizmo/enginefactory.h
+++ b/drumgizmo/enginefactory.h
@@ -53,6 +53,10 @@
#include "input/jackmidi.h"
#endif
+#ifdef HAVE_INPUT_ALSAMIDI
+#include "input/alsamidi.h"
+#endif
+
#ifdef HAVE_INPUT_OSS
#include "input/ossmidi.h"
#endif
@@ -77,11 +81,14 @@
#include "output/oss.h"
#endif
-
#ifdef HAVE_INPUT_OSSMIDI
#include "input/ossmidi.h"
#endif
+#ifdef HAVE_INPUT_ALSAMIDI
+#include "input/alsamidi.h"
+#endif
+
//! Factory for various input- and output engines
class EngineFactory
diff --git a/drumgizmo/input/alsamidi.cc b/drumgizmo/input/alsamidi.cc
new file mode 100644
index 0000000..068ea2b
--- /dev/null
+++ b/drumgizmo/input/alsamidi.cc
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * alsamidi.cc
+ *
+ * Copyright 2021 Volker Fischer (github.com/corrados)
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include <iostream>
+#include <cassert>
+
+#include "cpp11fix.h" // required for c++11
+#include "alsamidi.h"
+
+struct AlsaMidiInitError
+{
+ int const code;
+ const std::string msg;
+
+ AlsaMidiInitError(int op_code, const std::string& msg)
+ : code{op_code}
+ , msg{msg}
+ {
+ }
+
+ static inline void test(int code, const std::string& msg)
+ {
+ if(code < 0)
+ {
+ throw AlsaMidiInitError(code, msg);
+ }
+ }
+};
+
+AlsaMidiInputEngine::AlsaMidiInputEngine()
+ : AudioInputEngineMidi{}
+ , in_port(0)
+ , seq_handle{nullptr}
+ , pos{0u}
+ , events{}
+{
+}
+
+AlsaMidiInputEngine::~AlsaMidiInputEngine()
+{
+ if(seq_handle != nullptr)
+ {
+ snd_seq_close(seq_handle);
+ }
+}
+
+bool AlsaMidiInputEngine::init(const Instruments& instruments)
+{
+ if(!loadMidiMap(midimap_file, instruments))
+ {
+ std::cerr << "[AlsaMidiInputEngine] Failed to parse midimap '"
+ << midimap_file << "'\n";
+ return false;
+ }
+
+ // try to initialize alsa MIDI
+ try
+ {
+ // it is not allowed to block in the run() function, therefore we
+ // have to use a non-blocking mode
+ int value = snd_seq_open(&seq_handle, "default",
+ SND_SEQ_OPEN_INPUT, SND_SEQ_NONBLOCK);
+ AlsaMidiInitError::test(value, "snd_seq_open");
+
+ value = snd_seq_set_client_name(seq_handle, "drumgizmo");
+ AlsaMidiInitError::test(value, "snd_seq_set_client_name");
+
+ in_port =
+ snd_seq_create_simple_port(seq_handle, "listen:in",
+ SND_SEQ_PORT_CAP_WRITE |
+ SND_SEQ_PORT_CAP_SUBS_WRITE,
+ SND_SEQ_PORT_TYPE_APPLICATION);
+ AlsaMidiInitError::test(in_port, "snd_seq_create_simple_port");
+ }
+ catch(AlsaMidiInitError const& error)
+ {
+ std::cerr << "[AlsaMidiInputEngine] " << error.msg
+ << " failed: " << snd_strerror(error.code) << std::endl;
+ return false;
+ }
+
+ return true;
+}
+
+void AlsaMidiInputEngine::setParm(const std::string& parm,
+ const std::string& value)
+{
+ if(parm == "midimap")
+ {
+ // apply midimap filename
+ midimap_file = value;
+ }
+ else
+ {
+ std::cerr << "[AlsaMidiInputEngine] Unsupported parameter '" << parm
+ << "'\n";
+ }
+}
+
+bool AlsaMidiInputEngine::start()
+{
+ return true;
+}
+
+void AlsaMidiInputEngine::stop()
+{
+}
+
+void AlsaMidiInputEngine::pre()
+{
+}
+
+void AlsaMidiInputEngine::run(size_t pos, size_t len,
+ std::vector<event_t>& events)
+{
+ assert(events.empty());
+ snd_seq_event_t* ev = NULL;
+ if ( snd_seq_event_input(seq_handle, &ev) >= 0 )
+ {
+ // TODO Better solution needed: The ALSA MIDI event structure does
+ // not seem to contain the raw MIDI data, therefore we have to re-create
+ // the raw MIDI data based on the ALSA sequence event information.
+ std::vector<uint8_t> midi_buffer(3, 0);
+ bool message_type_handled = true;
+
+ switch(ev->type)
+ {
+ case SND_SEQ_EVENT_NOTEON:
+ midi_buffer[0] = ev->data.note.channel + 0x90; // NoteOn
+ midi_buffer[1] = ev->data.note.note;
+ midi_buffer[2] = ev->data.note.velocity;
+ break;
+
+ case SND_SEQ_EVENT_NOTEOFF:
+ midi_buffer[0] = ev->data.note.channel + 0x80; // NoteOff
+ midi_buffer[1] = ev->data.note.note;
+ midi_buffer[2] = ev->data.note.off_velocity;
+ break;
+
+ case SND_SEQ_EVENT_KEYPRESS:
+ midi_buffer[0] = ev->data.note.channel + 0xA0; // NoteAftertouch
+ midi_buffer[1] = ev->data.note.note;
+ midi_buffer[2] = ev->data.note.velocity;
+ break;
+
+ case SND_SEQ_EVENT_CONTROLLER:
+ midi_buffer[0] = ev->data.control.channel + 0xB0; // ControlChange
+ midi_buffer[1] = ev->data.control.param;
+ midi_buffer[2] = ev->data.control.value;
+ break;
+
+ default:
+ // unkown message type, ignore the message
+ message_type_handled = false;
+ break;
+ }
+
+ if(message_type_handled)
+ {
+ // since we do not want to introduce any additional delay for the
+ // MIDI processing, we set the offset to zero
+ processNote(midi_buffer.data(), midi_buffer.size(), 0, events);
+ }
+ }
+ snd_seq_free_event(ev);
+}
+
+void AlsaMidiInputEngine::post()
+{
+}
+
+bool AlsaMidiInputEngine::isFreewheeling() const
+{
+ return true;
+}
diff --git a/drumgizmo/input/alsamidi.h b/drumgizmo/input/alsamidi.h
new file mode 100644
index 0000000..73e0fc8
--- /dev/null
+++ b/drumgizmo/input/alsamidi.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * alsamidi.h
+ *
+ * Copyright 2021 Volker Fischer (github.com/corrados)
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#pragma once
+#include <memory>
+#include <alsa/asoundlib.h>
+
+#include "audioinputenginemidi.h"
+#include "midimapper.h"
+#include "midimapparser.h"
+
+class AlsaMidiInputEngine
+ : public AudioInputEngineMidi
+{
+public:
+ AlsaMidiInputEngine();
+ ~AlsaMidiInputEngine();
+
+ // based on AudioInputEngineMidi
+ bool init(const Instruments& instruments) override;
+ void setParm(const std::string& parm, const std::string& value) override;
+ bool start() override;
+ void stop() override;
+ void pre() override;
+ void run(size_t pos, size_t len, std::vector<event_t>& events) override;
+ void post() override;
+ bool isFreewheeling() const override;
+
+private:
+ int in_port;
+ snd_seq_t* seq_handle;
+
+ std::string midimap_file;
+ std::size_t pos;
+ std::vector<event_t> events;
+};