MidiInput.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * Copyright(c) 2008-2025 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * 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, see https://www.gnu.org/licenses
 *
 */
 
#include <core/IO/MidiInput.h>
#include <core/EventQueue.h>
#include <core/Preferences/Preferences.h>
#include <core/CoreActionController.h>
#include <core/Hydrogen.h>
#include <core/Basics/Instrument.h>
#include <core/Basics/InstrumentList.h>
#include <core/Basics/Note.h>
#include <core/MidiAction.h>
#include <core/AudioEngine/AudioEngine.h>
#include <core/MidiMap.h>
 
namespace H2Core
{
 
MidiInput::MidiInput()
                : m_bActive( false )
{
        //
 
}
 
 
MidiInput::~MidiInput()
{
        //INFOLOG( "DESTROY" );
}
 
void MidiInput::handleMidiMessage( const MidiMessage& msg )
{
                EventQueue::get_instance()->push_event( EVENT_MIDI_ACTIVITY, -1 );
 
                INFOLOG( QString( "Incoming message:  [%1]" ).arg( msg.toQString() ) );
 
                // midi channel filter for all messages
                bool bIsChannelValid = true;
                Preferences* pPref = Preferences::get_instance();
                if ( pPref->m_nMidiChannelFilter != -1
                  && pPref->m_nMidiChannelFilter != msg.m_nChannel
                ) {
                        bIsChannelValid = false;
                }
 
                // exclude all midi channel filter independent messages
                int type = msg.m_type;
                if (  MidiMessage::SYSEX == type
                   || MidiMessage::START == type
                   || MidiMessage::CONTINUE == type
                   || MidiMessage::STOP == type
                   || MidiMessage::SONG_POS == type
                   || MidiMessage::QUARTER_FRAME == type
                ) {
                        bIsChannelValid = true;
                }
 
                if ( !bIsChannelValid) {
                        return;
                }
 
                Hydrogen* pHydrogen = Hydrogen::get_instance();
                auto pAudioEngine = pHydrogen->getAudioEngine();
                if ( ! pHydrogen->getSong() ) {
                        ERRORLOG( "No song loaded, skipping note" );
                        return;
                }
 
                switch ( type ) {
                case MidiMessage::SYSEX:
                                handleSysexMessage( msg );
                                break;
 
                case MidiMessage::NOTE_ON:
                                handleNoteOnMessage( msg );
                                break;
 
                case MidiMessage::NOTE_OFF:
                                handleNoteOffMessage( msg, false );
                                break;
 
                case MidiMessage::POLYPHONIC_KEY_PRESSURE:
                                handlePolyphonicKeyPressureMessage( msg );
                                break;
 
                case MidiMessage::CONTROL_CHANGE:
                                handleControlChangeMessage( msg );
                                break;
 
                case MidiMessage::PROGRAM_CHANGE:
                                handleProgramChangeMessage( msg );
                                break;
 
                case MidiMessage::START: /* Start from position 0 */
                        if ( pAudioEngine->getState() != AudioEngine::State::Playing ) {
                                pHydrogen->getCoreActionController()->locateToColumn( 0 );
                                auto pAction = std::make_shared<Action>("PLAY");
                                MidiActionManager::get_instance()->handleAction( pAction );
                        }
                        break;
 
                case MidiMessage::CONTINUE: /* Just start */ {
                        auto pAction = std::make_shared<Action>("PLAY");
                        MidiActionManager::get_instance()->handleAction( pAction );
                        break;
                }
 
                case MidiMessage::STOP: /* Stop in current position i.e. Pause */ {
                        auto pAction = std::make_shared<Action>("PAUSE");
                        MidiActionManager::get_instance()->handleAction( pAction );
                        break;
                }
 
                case MidiMessage::CHANNEL_PRESSURE:
                case MidiMessage::PITCH_WHEEL:
                case MidiMessage::SONG_POS:
                case MidiMessage::QUARTER_FRAME:
                case MidiMessage::SONG_SELECT:
                case MidiMessage::TUNE_REQUEST:
                case MidiMessage::TIMING_CLOCK:
                case MidiMessage::ACTIVE_SENSING:
                case MidiMessage::RESET:
                        ERRORLOG( QString( "MIDI message of type [%1] is not supported by Hydrogen" )
                                          .arg( MidiMessage::TypeToQString( msg.m_type ) ) );
                        break;
 
                case MidiMessage::UNKNOWN:
                        ERRORLOG( "Unknown midi message" );
                        break;
 
                default:
                        ERRORLOG( QString( "unhandled midi message type: %1 (%2)" )
                                          .arg( static_cast<int>( msg.m_type ) )
                                          .arg( MidiMessage::TypeToQString( msg.m_type ) ) );
                }
 
                // Two spaces after "msg." in a row to align message parameters
                INFOLOG( QString( "DONE handling msg: [%1]" ).arg( msg.toQString() ) );
}
 
void MidiInput::handleControlChangeMessage( const MidiMessage& msg )
{
        //INFOLOG( QString( "[handleMidiMessage] CONTROL_CHANGE Parameter: %1, Value: %2" ).arg( msg.m_nData1 ).arg( msg.m_nData2 ) );
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        MidiActionManager *pMidiActionManager = MidiActionManager::get_instance();
        MidiMap *pMidiMap = MidiMap::get_instance();
 
        for ( const auto& ppAction : pMidiMap->getCCActions( msg.m_nData1 ) ) {
                if ( ppAction != nullptr && ! ppAction->isNull() ) {
                        auto pNewAction = std::make_shared<Action>( ppAction );
                        pNewAction->setValue( QString::number( msg.m_nData2 ) );
                        pMidiActionManager->handleAction( pNewAction );
                }
        }
 
        if ( msg.m_nData1 == 04 ) {
                pHydrogen->setHihatOpenness( msg.m_nData2 );
        }
 
        pHydrogen->setLastMidiEvent( MidiMessage::Event::CC );
        pHydrogen->setLastMidiEventParameter( msg.m_nData1 );
}
 
void MidiInput::handleProgramChangeMessage( const MidiMessage& msg )
{
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        MidiActionManager *pMidiActionManager = MidiActionManager::get_instance();
        MidiMap *pMidiMap = MidiMap::get_instance();
 
        for ( const auto& ppAction : pMidiMap->getPCActions() ) {
                if ( ppAction != nullptr && ! ppAction->isNull() ) {
                        auto pNewAction = std::make_shared<Action>( ppAction );
                        pNewAction->setValue( QString::number( msg.m_nData1 ) );
                        pMidiActionManager->handleAction( pNewAction );
                }
        }
 
        pHydrogen->setLastMidiEvent( MidiMessage::Event::PC );
        pHydrogen->setLastMidiEventParameter( 0 );
}
 
void MidiInput::handleNoteOnMessage( const MidiMessage& msg )
{
//      INFOLOG( "handleNoteOnMessage" );
 
        const int nNote = msg.m_nData1;
        float fVelocity = msg.m_nData2 / 127.0;
 
        if ( fVelocity == 0 ) {
                handleNoteOffMessage( msg, false );
                return;
        }
 
        MidiActionManager * pMidiActionManager = MidiActionManager::get_instance();
        MidiMap * pMidiMap = MidiMap::get_instance();
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        auto pPref = Preferences::get_instance();
 
        pHydrogen->setLastMidiEvent( MidiMessage::Event::Note );
        pHydrogen->setLastMidiEventParameter( msg.m_nData1 );
 
        bool bActionSuccess = false;
        for ( const auto& ppAction : pMidiMap->getNoteActions( msg.m_nData1 ) ) {
                if ( ppAction != nullptr && ! ppAction->isNull() ) {
                        auto pNewAction = std::make_shared<Action>( ppAction );
                        pNewAction->setValue( QString::number( msg.m_nData2 ) );
                        if ( pMidiActionManager->handleAction( pNewAction ) ) {
                                bActionSuccess = true;
                        }
                }
        }
 
        if ( bActionSuccess && pPref->m_bMidiDiscardNoteAfterAction ) {
                return;
        }
 
        pHydrogen->getCoreActionController()->handleNote( nNote, fVelocity, false );
}
 
/*
        EDrums (at least Roland TD-6V) uses PolyphonicKeyPressure
        for cymbal choke.
        If the message is 127 (choked) we send a NoteOff
*/
void MidiInput::handlePolyphonicKeyPressureMessage( const MidiMessage& msg )
{
        if( msg.m_nData2 == 127 ) {
                handleNoteOffMessage( msg, true );
        }
}
 
void MidiInput::handleNoteOffMessage( const MidiMessage& msg, bool CymbalChoke )
{
//      INFOLOG( "handleNoteOffMessage" );
        if ( !CymbalChoke && Preferences::get_instance()->m_bMidiNoteOffIgnore ) {
                return;
        }
 
        Hydrogen::get_instance()->getCoreActionController()->
                handleNote( msg.m_nData1, 0.0, true );
}
 
void MidiInput::handleSysexMessage( const MidiMessage& msg )
{
 
        /*
                General MMC message
                0       1       2       3       4       5
                F0      7F      id      6       cmd     247
 
                cmd:
                1       stop
                2       play
                3       Deferred play
                4       Fast Forward
                5       Rewind
                6       Record strobe (punch in)
                7       Record exit (punch out)
                8       Record ready
                9       Pause
 
 
                Goto MMC message
                0       1       2       3       4       5       6       7       8       9       10      11      12
                240     127     id      6       68      6       1       hr      mn      sc      fr      ff      247
        */
 
 
        MidiActionManager * pMidiActionManager = MidiActionManager::get_instance();
        MidiMap * pMidiMap = MidiMap::get_instance();
        Hydrogen *pHydrogen = Hydrogen::get_instance();
 
 
        if ( msg.m_sysexData.size() == 6 && 
                 msg.m_sysexData[ 1 ] == 127 && msg.m_sysexData[ 3 ] == 6 ) {
                // MIDI Machine Control (MMC) message
 
                MidiMessage::Event event = MidiMessage::Event::Null;
                QString sMMCtype;
                switch ( msg.m_sysexData[4] ) {
                case 1: // STOP
                        event = MidiMessage::Event::MmcStop;
                        break;
 
                case 2: // PLAY
                        event = MidiMessage::Event::MmcPlay;
                        break;
 
                case 3: //DEFERRED PLAY
                        event = MidiMessage::Event::MmcDeferredPlay;
                        break;
 
                case 4: // FAST FWD
                        event = MidiMessage::Event::MmcFastForward;
                        break;
 
                case 5: // REWIND
                        event = MidiMessage::Event::MmcRewind;
                        break;
 
                case 6: // RECORD STROBE (PUNCH IN)
                        event = MidiMessage::Event::MmcRecordStrobe;
                        break;
 
                case 7: // RECORD EXIT (PUNCH OUT)
                        event = MidiMessage::Event::MmcRecordExit;
                        break;
 
                case 8: // RECORD READY
                        event = MidiMessage::Event::MmcRecordReady;
                        break;
 
                case 9: //PAUSE
                        event = MidiMessage::Event::MmcPause;
                        break;
                }
 
                if ( event != MidiMessage::Event::Null ) {
                        const QString sMMCtype = MidiMessage::EventToQString( event );
                        INFOLOG( QString( "MIDI Machine Control command: [%1]" )
                                         .arg( sMMCtype ) );
                        
                        pHydrogen->setLastMidiEvent( event );
                        pHydrogen->setLastMidiEventParameter( msg.m_nData1 );
                        
                        pMidiActionManager->handleActions( pMidiMap->getMMCActions( sMMCtype ) );
                }
                else {
                        WARNINGLOG( "Unknown MIDI Machine Control (MMC) Command" );
                }
        }
        else if ( msg.m_sysexData.size() == 13 && 
                          msg.m_sysexData[ 1 ] == 127 && msg.m_sysexData[ 3 ] == 68 ) {
                WARNINGLOG( "MMC GOTO Message not implemented yet" );
                // int hr = msg.m_sysexData[7];
                // int mn = msg.m_sysexData[8];
                // int sc = msg.m_sysexData[9];
                // int fr = msg.m_sysexData[10];
                // int ff = msg.m_sysexData[11];
                // char tmp[200];
                // sprintf( tmp, "[handleSysexMessage] GOTO %d:%d:%d:%d:%d", hr, mn, sc, fr, ff );
                // INFOLOG( tmp );
        }
        else {
                WARNINGLOG( QString( "Unsupported SysEx message: [%1]" )
                                        .arg( msg.toQString() ) );
        }
}
 
};