From 7a5f9fc08ea4f25cd20e743a9a1ef5566246cf2c Mon Sep 17 00:00:00 2001 From: Marcelo Fernandez Date: Sat, 14 Jul 2018 09:11:28 -0300 Subject: Added a new MIDIDriver class --- drivers/alsamidi/SCsub | 8 ++ drivers/alsamidi/alsa_midi.cpp | 201 +++++++++++++++++++++++++++++++++++++++++ drivers/alsamidi/alsa_midi.h | 69 ++++++++++++++ 3 files changed, 278 insertions(+) create mode 100644 drivers/alsamidi/SCsub create mode 100644 drivers/alsamidi/alsa_midi.cpp create mode 100644 drivers/alsamidi/alsa_midi.h (limited to 'drivers/alsamidi') diff --git a/drivers/alsamidi/SCsub b/drivers/alsamidi/SCsub new file mode 100644 index 0000000000..233593b0f9 --- /dev/null +++ b/drivers/alsamidi/SCsub @@ -0,0 +1,8 @@ +#!/usr/bin/env python + +Import('env') + +# Driver source files +env.add_source_files(env.drivers_sources, "*.cpp") + +Export('env') diff --git a/drivers/alsamidi/alsa_midi.cpp b/drivers/alsamidi/alsa_midi.cpp new file mode 100644 index 0000000000..599470d7e0 --- /dev/null +++ b/drivers/alsamidi/alsa_midi.cpp @@ -0,0 +1,201 @@ +/*************************************************************************/ +/* alsa_midi.cpp */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */ +/* */ +/* Permission is hereby granted, free of charge, to any person obtaining */ +/* a copy of this software and associated documentation files (the */ +/* "Software"), to deal in the Software without restriction, including */ +/* without limitation the rights to use, copy, modify, merge, publish, */ +/* distribute, sublicense, and/or sell copies of the Software, and to */ +/* permit persons to whom the Software is furnished to do so, subject to */ +/* the following conditions: */ +/* */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/*************************************************************************/ + +#ifdef ALSAMIDI_ENABLED + +#include + +#include "alsa_midi.h" +#include "os/os.h" +#include "print_string.h" + +static int get_message_size(uint8_t message) { + switch (message & 0xF0) { + case 0x80: // note off + case 0x90: // note on + case 0xA0: // aftertouch + case 0xB0: // continuous controller + return 3; + + case 0xC0: // patch change + case 0xD0: // channel pressure + case 0xE0: // pitch bend + return 2; + } + + return 256; +} + +void MIDIDriverALSAMidi::thread_func(void *p_udata) { + MIDIDriverALSAMidi *md = (MIDIDriverALSAMidi *)p_udata; + uint64_t timestamp = 0; + uint8_t buffer[256]; + int expected_size = 255; + int bytes = 0; + + while (!md->exit_thread) { + int ret; + + md->lock(); + + for (int i = 0; i < md->connected_inputs.size(); i++) { + snd_rawmidi_t *midi_in = md->connected_inputs[i]; + do { + uint8_t byte = 0; + ret = snd_rawmidi_read(midi_in, &byte, 1); + if (ret < 0) { + if (ret != -EAGAIN) { + ERR_PRINTS("snd_rawmidi_read error: " + String(snd_strerror(ret))); + } + } else { + if (byte & 0x80) { + // Flush previous packet if there is any + if (bytes) { + md->receive_input_packet(timestamp, buffer, bytes); + bytes = 0; + } + expected_size = get_message_size(byte); + } + + if (bytes < 256) { + buffer[bytes++] = byte; + // If we know the size of the current packet receive it if it reached the expected size + if (bytes >= expected_size) { + md->receive_input_packet(timestamp, buffer, bytes); + bytes = 0; + } + } + } + } while (ret > 0); + } + + md->unlock(); + + OS::get_singleton()->delay_usec(1000); + } +} + +Error MIDIDriverALSAMidi::open() { + + void **hints; + + if (snd_device_name_hint(-1, "rawmidi", &hints) < 0) + return ERR_CANT_OPEN; + + int i = 0; + for (void **n = hints; *n != NULL; n++) { + char *name = snd_device_name_get_hint(*n, "NAME"); + + if (name != NULL) { + snd_rawmidi_t *midi_in; + int ret = snd_rawmidi_open(&midi_in, NULL, name, SND_RAWMIDI_NONBLOCK); + if (ret >= 0) { + connected_inputs.insert(i++, midi_in); + } + } + + if (name != NULL) + free(name); + } + snd_device_name_free_hint(hints); + + mutex = Mutex::create(); + thread = Thread::create(MIDIDriverALSAMidi::thread_func, this); + + return OK; +} + +void MIDIDriverALSAMidi::close() { + + if (thread) { + exit_thread = true; + Thread::wait_to_finish(thread); + + memdelete(thread); + thread = NULL; + } + + if (mutex) { + memdelete(mutex); + mutex = NULL; + } + + for (int i = 0; i < connected_inputs.size(); i++) { + snd_rawmidi_t *midi_in = connected_inputs[i]; + snd_rawmidi_close(midi_in); + } + connected_inputs.clear(); +} + +void MIDIDriverALSAMidi::lock() const { + + if (mutex) + mutex->lock(); +} + +void MIDIDriverALSAMidi::unlock() const { + + if (mutex) + mutex->unlock(); +} + +PoolStringArray MIDIDriverALSAMidi::get_connected_inputs() { + + PoolStringArray list; + + lock(); + for (int i = 0; i < connected_inputs.size(); i++) { + snd_rawmidi_t *midi_in = connected_inputs[i]; + snd_rawmidi_info_t *info; + + snd_rawmidi_info_malloc(&info); + snd_rawmidi_info(midi_in, info); + list.push_back(snd_rawmidi_info_get_name(info)); + snd_rawmidi_info_free(info); + } + unlock(); + + return list; +} + +MIDIDriverALSAMidi::MIDIDriverALSAMidi() { + + mutex = NULL; + thread = NULL; + + exit_thread = false; +} + +MIDIDriverALSAMidi::~MIDIDriverALSAMidi() { + + close(); +} + +#endif diff --git a/drivers/alsamidi/alsa_midi.h b/drivers/alsamidi/alsa_midi.h new file mode 100644 index 0000000000..90e458a365 --- /dev/null +++ b/drivers/alsamidi/alsa_midi.h @@ -0,0 +1,69 @@ +/*************************************************************************/ +/* alsa_midi.h */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */ +/* */ +/* Permission is hereby granted, free of charge, to any person obtaining */ +/* a copy of this software and associated documentation files (the */ +/* "Software"), to deal in the Software without restriction, including */ +/* without limitation the rights to use, copy, modify, merge, publish, */ +/* distribute, sublicense, and/or sell copies of the Software, and to */ +/* permit persons to whom the Software is furnished to do so, subject to */ +/* the following conditions: */ +/* */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/*************************************************************************/ + +#ifdef ALSAMIDI_ENABLED + +#ifndef ALSA_MIDI_H +#define ALSA_MIDI_H + +#include +#include + +#include "core/os/mutex.h" +#include "core/os/thread.h" +#include "core/vector.h" +#include "os/midi_driver.h" + +class MIDIDriverALSAMidi : public MIDIDriver { + + Thread *thread; + Mutex *mutex; + + Vector connected_inputs; + + bool exit_thread; + + static void thread_func(void *p_udata); + + void lock() const; + void unlock() const; + +public: + virtual Error open(); + virtual void close(); + + virtual PoolStringArray get_connected_inputs(); + + MIDIDriverALSAMidi(); + virtual ~MIDIDriverALSAMidi(); +}; + +#endif +#endif -- cgit v1.2.3