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Diffstat (limited to 'backends/midi/stmidi.cpp')
| -rw-r--r-- | backends/midi/stmidi.cpp | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/backends/midi/stmidi.cpp b/backends/midi/stmidi.cpp new file mode 100644 index 0000000000..addb23c6bd --- /dev/null +++ b/backends/midi/stmidi.cpp @@ -0,0 +1,155 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2001 Ludvig Strigeus + * Copyright (C) 2001-2006 The ScummVM project + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/* + * Raw MIDI output for the Atari ST line of computers. + * Based on the ScummVM SEQ & CoreMIDI drivers. + * Atari code by Keith Scroggins + * We, unfortunately, could not use the SEQ driver because the /dev/midi under + * FreeMiNT (and hence in libc) is considered to be a serial port for machine + * access. So, we just use OS calls then to send the data to the MIDI ports + * directly. The current implementation is sending 1 byte at a time because + * in most cases we are only sending up to 3 bytes, I believe this saves a few + * cycles. I might change so sysex messages are sent the other way later. + */ + +#if defined __MINT__ + +#include <osbind.h> +#include "sound/mpu401.h" +#include "common/util.h" +#include "sound/musicplugin.h" + +class MidiDriver_STMIDI : public MidiDriver_MPU401 { +public: + MidiDriver_STMIDI() : _isOpen (false) { } + int open(); + void close(); + void send(uint32 b); + void sysEx(const byte *msg, uint16 length); + +private: + bool _isOpen; +}; + +int MidiDriver_STMIDI::open() { + if ((_isOpen) && (!Bcostat(4))) + return MERR_ALREADY_OPEN; + warning("ST Midi Port Open"); + _isOpen = true; + return 0; +} + +void MidiDriver_STMIDI::close() { + MidiDriver_MPU401::close(); + _isOpen = false; +} + +void MidiDriver_STMIDI::send(uint32 b) { + + byte status_byte = (b & 0x000000FF); + byte first_byte = (b & 0x0000FF00) >> 8; + byte second_byte = (b & 0x00FF0000) >> 16; + +// warning("ST MIDI Packet sent"); + + switch (b & 0xF0) { + case 0x80: // Note Off + case 0x90: // Note On + case 0xA0: // Polyphonic Key Pressure + case 0xB0: // Controller + case 0xE0: // Pitch Bend + Bconout(3, status_byte); + Bconout(3, first_byte); + Bconout(3, second_byte); + break; + case 0xC0: // Program Change + case 0xD0: // Aftertouch + Bconout(3, status_byte); + Bconout(3, first_byte); + break; + default: + fprintf(stderr, "Unknown : %08x\n", (int)b); + break; + } +} + +void MidiDriver_STMIDI::sysEx (const byte *msg, uint16 length) { + if (length > 254) { + warning ("Cannot send SysEx block - data too large"); + return; + } + + const byte *chr = msg; + warning("Sending SysEx Message"); + + Bconout(3, '0xF0'); + for (; length; --length, ++chr) { + Bconout(3,((unsigned char) *chr & 0x7F)); + } + Bconout(3, '0xF7'); +} + +// Plugin interface + +class StMidiMusicPlugin : public MusicPluginObject { +public: + const char *getName() const { + return "STMIDI"; + } + + const char *getId() const { + return "stmidi"; + } + + MusicDevices getDevices() const; + PluginError createInstance(Audio::Mixer *mixer, MidiDriver **mididriver) + const; +}; + +MusicDevices StMidiMusicPlugin::getDevices() const { + MusicDevices devices; + // TODO: Return a different music type depending on the configuration + // TODO: List the available devices + devices.push_back(MusicDevice(this, "", MT_GM)); + return devices; +} + +PluginError StMidiMusicPlugin::createInstance(Audio::Mixer *mixer, MidiDriver **mididriver) const { + *mididriver = new MidiDriver_STMIDI(); + + return kNoError; +} + +MidiDriver *MidiDriver_STMIDI_create(Audio::Mixer *mixer) { + MidiDriver *mididriver; + + StMidiMusicPlugin p; + p.createInstance(mixer, &mididriver); + + return mididriver; +} + +//#if PLUGIN_ENABLED_DYNAMIC(STMIDI) + //REGISTER_PLUGIN_DYNAMIC(STMIDI, PLUGIN_TYPE_MUSIC, StMidiMusicPlugin); +//#else + REGISTER_PLUGIN_STATIC(STMIDI, PLUGIN_TYPE_MUSIC, StMidiMusicPlugin); +//#endif + +#endif |