/*************************************************************************/ /* midi_driver_alsamidi.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2021 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 "midi_driver_alsamidi.h" #include "core/os/os.h" #include "core/string/print_string.h" #include <errno.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 case 0xE0: // pitch bend case 0xF2: // song position pointer return 3; case 0xC0: // patch change case 0xD0: // channel pressure case 0xF1: // time code quarter frame case 0xF3: // song select return 2; case 0xF0: // SysEx start case 0xF4: // reserved case 0xF5: // reserved case 0xF6: // tune request case 0xF7: // SysEx end case 0xF8: // timing clock case 0xF9: // reserved case 0xFA: // start case 0xFB: // continue case 0xFC: // stop case 0xFD: // reserved case 0xFE: // active sensing case 0xFF: // reset return 1; } 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_PRINT("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); // After a SysEx start, all bytes are data until a SysEx end, so // we're going to end the command at the SES, and let the common // driver ignore the following data bytes. } 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 != nullptr; n++) { char *name = snd_device_name_get_hint(*n, "NAME"); if (name != nullptr) { snd_rawmidi_t *midi_in; int ret = snd_rawmidi_open(&midi_in, nullptr, name, SND_RAWMIDI_NONBLOCK); if (ret >= 0) { connected_inputs.insert(i++, midi_in); } } if (name != nullptr) { free(name); } } snd_device_name_free_hint(hints); exit_thread = false; thread.start(MIDIDriverALSAMidi::thread_func, this); return OK; } void MIDIDriverALSAMidi::close() { exit_thread = true; thread.wait_to_finish(); 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 { mutex.lock(); } void MIDIDriverALSAMidi::unlock() const { mutex.unlock(); } PackedStringArray MIDIDriverALSAMidi::get_connected_inputs() { PackedStringArray 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() { exit_thread = false; } MIDIDriverALSAMidi::~MIDIDriverALSAMidi() { close(); } #endif // ALSAMIDI_ENABLED