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155 lines
3.3 KiB
155 lines
3.3 KiB
//
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// mididevice.cpp
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//
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// MiniDexed - Dexed FM synthesizer for bare metal Raspberry Pi
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// Copyright (C) 2022 The MiniDexed Team
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//
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// Original author of this class:
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// R. Stange <rsta2@o2online.de>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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#include "mididevice.h"
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#include "minidexed.h"
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#include "config.h"
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#include <stdio.h>
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#include <assert.h>
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#define MIDI_NOTE_OFF 0b1000
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#define MIDI_NOTE_ON 0b1001
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#define MIDI_AFTERTOUCH 0b1010 // TODO
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#define MIDI_CONTROL_CHANGE 0b1011
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#define MIDI_CC_BANK_SELECT_MSB 0 // TODO
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#define MIDI_CC_VOLUME 7
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#define MIDI_CC_BANK_SELECT_LSB 32
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#define MIDI_PROGRAM_CHANGE 0b1100
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#define MIDI_PITCH_BEND 0b1110
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#define MIDI_TIMING_CLOCK 0xF8
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#define MIDI_ACTIVE_SENSING 0xFE
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CMIDIDevice::CMIDIDevice (CMiniDexed *pSynthesizer, CConfig *pConfig)
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: m_pSynthesizer (pSynthesizer),
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m_pConfig (pConfig)
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{
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}
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CMIDIDevice::~CMIDIDevice (void)
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{
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m_pSynthesizer = 0;
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}
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void CMIDIDevice::MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsigned nCable)
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{
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assert (m_pSynthesizer != 0);
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// The packet contents are just normal MIDI data - see
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// https://www.midi.org/specifications/item/table-1-summary-of-midi-message
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if (m_pConfig->GetMIDIDumpEnabled ())
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{
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switch (nLength)
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{
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case 1:
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if ( pMessage[0] != MIDI_TIMING_CLOCK
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&& pMessage[0] != MIDI_ACTIVE_SENSING)
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{
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printf ("MIDI %u: %02X\n", nCable, (unsigned) pMessage[0]);
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}
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break;
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case 2:
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printf ("MIDI %u: %02X %02X\n", nCable,
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(unsigned) pMessage[0], (unsigned) pMessage[1]);
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break;
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case 3:
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printf ("MIDI %u: %02X %02X %02X\n", nCable,
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(unsigned) pMessage[0], (unsigned) pMessage[1],
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(unsigned) pMessage[2]);
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break;
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}
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}
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if (nLength < 2)
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{
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return;
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}
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u8 ucStatus = pMessage[0];
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// TODO: u8 ucChannel = ucStatus & 0x0F;
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u8 ucType = ucStatus >> 4;
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u8 ucKeyNumber = pMessage[1];
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u8 ucVelocity = pMessage[2];
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switch (ucType)
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{
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case MIDI_NOTE_ON:
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if (nLength < 3)
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{
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break;
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}
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if (ucVelocity > 0)
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{
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if (ucVelocity <= 127)
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{
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m_pSynthesizer->keydown (ucKeyNumber, ucVelocity);
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}
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}
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else
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{
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m_pSynthesizer->keyup (ucKeyNumber);
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}
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break;
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case MIDI_NOTE_OFF:
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if (nLength < 3)
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{
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break;
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}
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m_pSynthesizer->keyup (ucKeyNumber);
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break;
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case MIDI_CONTROL_CHANGE:
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if (nLength < 3)
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{
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break;
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}
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switch (pMessage[1])
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{
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case MIDI_CC_VOLUME:
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m_pSynthesizer->SetVolume (pMessage[2]);
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break;
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case MIDI_CC_BANK_SELECT_LSB:
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m_pSynthesizer->BankSelectLSB (pMessage[2]);
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break;
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}
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break;
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case MIDI_PROGRAM_CHANGE:
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m_pSynthesizer->ProgramChange (pMessage[1]);
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break;
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case MIDI_PITCH_BEND:
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m_pSynthesizer->setPitchbend (pMessage[1]);
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break;
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default:
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break;
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}
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}
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