Collidoscope

/*

 Copyright (C) 2016  Queen Mary University of London 

 Author: Fiore Martin

 This file is part of Collidoscope.

 Collidoscope 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 3 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 <http://www.gnu.org/licenses/>.

*/

#include "cinder/app/App.h"

#include "cinder/app/RendererGl.h"

#include "cinder/gl/gl.h"

#include "cinder/Exception.h"

#include <stdexcept>

#include "Config.h"

#include "Wave.h"

#include "DrawInfo.h"

#include "Log.h"

#include "AudioEngine.h"

#include "Oscilloscope.h"

#include "Messages.h"

#include "MIDI.h"

using namespace ci;

using namespace ci::app;

using namespace std;

class CollidoscopeApp : public App {

  public:

    void setup() override;

    void setupGraphics();

    /** Receives MIDI command messages from MIDI thread */

    void receiveCommands();

    /** Prints command line usage */

    void usage();

    void keyDown( KeyEvent event ) override;

    void update() override;

    void draw() override;

    void resize() override;

    Config mConfig;

    collidoscope::MIDI mMIDI;

    AudioEngine mAudioEngine;

    array< shared_ptr< Wave >, NUM_WAVES > mWaves;

    array< shared_ptr< DrawInfo >, NUM_WAVES > mDrawInfos;

    array< shared_ptr< Oscilloscope >, NUM_WAVES > mOscilloscopes;

    // buffer to read the WAVE_* messages as a new wave gets recorded 

    array< RecordWaveMsg*, NUM_WAVES> mRecordWaveMessageBuffers;

    //buffer to read the TRIGGER_* messages as the pgranulars play

    array< vector< CursorTriggerMsg >, NUM_WAVES > mCursorTriggerMessagesBuffers;

    double mSecondsPerChunk;

    ~CollidoscopeApp();

};

void CollidoscopeApp::setup()

{

    hideCursor();

    /* setup is logged: setup steps and errors */

    /*try {

        mConfig.loadFromFile( "./collidoscope_config.xml" );

    }

    catch ( const Exception &e ){

        logError( string("Exception loading config from file:") + e.what() );

    }*/

    // setup buffers to read messages from audio thread 

    for ( size_t i = 0; i < NUM_WAVES; i++ ){

        mRecordWaveMessageBuffers[i] = new RecordWaveMsg[mConfig.getNumChunks()];

        mCursorTriggerMessagesBuffers[i].reserve( mConfig.getCursorTriggerMessageBufSize() );

    }

    mAudioEngine.setup( mConfig );

    setupGraphics();

    mSecondsPerChunk = mConfig.getWaveLen() / mConfig.getNumChunks();

    try {

        mMIDI.setup( mConfig );

    }

    catch ( const collidoscope::MIDIException &e ){

        logError( string( "Exception opening MIDI input device: " ) + e.getMessage() );

    }

}

void CollidoscopeApp::setupGraphics()

{

    for ( size_t i = 0; i < NUM_WAVES; i++ ){

        mDrawInfos[i] = make_shared< DrawInfo >( i );

        mWaves[i] = make_shared< Wave >(mConfig.getNumChunks(), mConfig.getWaveSelectionColor(i) );

        mOscilloscopes[i] = make_shared< Oscilloscope >( mAudioEngine.getAudioOutputBuffer( i ).getNumFrames() / mConfig.getOscilloscopeNumPointsDivider() );

    }

}

void CollidoscopeApp::keyDown( KeyEvent event )

{

    char c = event.getChar();

    const size_t waveIdx = 0;

    switch (c){

    case 'r' : 

        mAudioEngine.record( waveIdx );

        break;

    case 'w': {

        mWaves[waveIdx]->getSelection().setSize(mWaves[waveIdx]->getSelection().getSize() + 1);

        size_t numSelectionChunks = mWaves[waveIdx]->getSelection().getSize();

        // how many samples in one selection ?

        size_t selectionSize = numSelectionChunks * (mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks());

        mAudioEngine.setSelectionSize(waveIdx, selectionSize);

    };

        break;

    case 's': {

        mWaves[waveIdx]->getSelection().setSize( mWaves[waveIdx]->getSelection().getSize() - 1 );

        size_t selectionSize = mWaves[waveIdx]->getSelection().getSize() *(mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks());

        mAudioEngine.setSelectionSize( waveIdx, selectionSize );

    };

        break;

    case 'd': {

        size_t selectionStart = mWaves[waveIdx]->getSelection().getStart();

        mWaves[waveIdx]->getSelection().setStart( selectionStart + 1 );

        selectionStart = mWaves[waveIdx]->getSelection().getStart();

        mAudioEngine.setSelectionStart( waveIdx, selectionStart * (mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks()) );

    };

        break;

    case 'a': {

        size_t selectionStart = mWaves[waveIdx]->getSelection().getStart();

        if ( selectionStart == 0 )

            return;

        mWaves[waveIdx]->getSelection().setStart( selectionStart - 1 );

        selectionStart = mWaves[waveIdx]->getSelection().getStart();

        mAudioEngine.setSelectionStart( waveIdx, selectionStart * (mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks()) );

    };

        break;

    case 'f':

        setFullScreen( !isFullScreen() );

        break;

    case ' ': { 

        static bool isOn = false;

        isOn = !isOn;

        if ( isOn ){

            mAudioEngine.loopOn( waveIdx );

        }

        else{

            mAudioEngine.loopOff( waveIdx );

        }

    };

        break;

    case '9': {

        int c = mWaves[waveIdx]->getSelection().getParticleSpread();

        if ( c == 1 )

            return;

        else

            c -= 1;

        mAudioEngine.setGrainDurationCoeff( waveIdx, c );

        mWaves[waveIdx]->getSelection().setParticleSpread( float( c ) );

    }; break;

    case '0': {

        int c = mWaves[waveIdx]->getSelection().getParticleSpread();

        if ( c == 8 )

            return;

        else

            c += 1;

        mAudioEngine.setGrainDurationCoeff( waveIdx, c );

        mWaves[waveIdx]->getSelection().setParticleSpread( float( c ) );

    }; break;

    }

}

void CollidoscopeApp::update()

{

    // check incoming commands 

    receiveCommands();

    // check new wave chunks from recorder buffer 

    for ( size_t i = 0; i < NUM_WAVES; i++ ){

        size_t availableRead = mAudioEngine.getRecordWaveAvailable( i );

        mAudioEngine.readRecordWave( i, mRecordWaveMessageBuffers[i], availableRead );

        for ( size_t msgIndex = 0; msgIndex < availableRead; msgIndex++ ){

            const RecordWaveMsg & msg = mRecordWaveMessageBuffers[i][msgIndex];

            if ( msg.cmd == Command::WAVE_CHUNK ){

                mWaves[i]->setChunk( msg.index, msg.arg1, msg.arg2 );

            }

            else if ( msg.cmd == Command::WAVE_START ){

                mWaves[i]->reset( true ); // reset only chunks but leave selection 

            }

        }

    }

    // check if new cursors have been triggered 

    for ( size_t i = 0; i < NUM_WAVES; i++ ){

        mAudioEngine.checkCursorTriggers( i, mCursorTriggerMessagesBuffers[i] );

        for ( auto & trigger : mCursorTriggerMessagesBuffers[i] ){

            const int nodeID = trigger.synthID;

            switch ( trigger.cmd ){

            case Command::TRIGGER_UPDATE: {

                mWaves[i]->setCursorPos( nodeID, mWaves[i]->getSelection().getStart(), *mDrawInfos[i] );

            };

                break;

            case Command::TRIGGER_END: {

                mWaves[i]->removeCursor( nodeID );

            };

                break;

            }

        }

        mCursorTriggerMessagesBuffers[i].clear();

    }

    // update cursors 

    for ( size_t i = 0; i < NUM_WAVES; i++ ){

        mWaves[i]->update( mSecondsPerChunk, *mDrawInfos[i] );

    }

    // update oscilloscope 

    for ( size_t i = 0; i < NUM_WAVES; i++ ){

        const audio::Buffer &audioOutBuffer = mAudioEngine.getAudioOutputBuffer( i );

        // one oscilloscope sample 

        for ( size_t j = 0; j < mOscilloscopes[i]->getNumPoints(); j++ ){

            mOscilloscopes[i]->setPoint( j, audioOutBuffer.getData()[j], *mDrawInfos[i] );

        }

    }

}

void CollidoscopeApp::draw()

{

    gl::clear( Color( 0, 0, 0 ) );

    for ( int i = 0; i < NUM_WAVES; i++ ){

        if ( i == 1 ){

            /* for the upper wave flip the x over the center of the screen which is

            the composition of rotate on the y-axis and translate by -screenwidth*/

            gl::pushModelMatrix();

            gl::rotate( float(M_PI), ci::vec3( 0, 1, 0 ) );

            gl::translate( float( -getWindowWidth() ), 0.0f );

            mOscilloscopes[i]->draw();

            mWaves[i]->draw( *mDrawInfos[i] );

            gl::popModelMatrix();

        }

        else{

            mOscilloscopes[i]->draw();

            mWaves[i]->draw( *mDrawInfos[i] );

        }

    }

}

void CollidoscopeApp::resize()

{

    App::resize();

    for ( int i = 0; i < NUM_WAVES; i++ ){

        // reset the drawing information with the new windows size and same shrink factor  

        mDrawInfos[i]->reset( getWindow()->getBounds(), 3.0f / 5.0f );

        /* reset the oscilloscope points to zero */

        for ( int j = 0; j < mOscilloscopes[i]->getNumPoints(); j++ ){

            mOscilloscopes[i]->setPoint(j, 0.0f, *mDrawInfos[i] );

        }

    }

}

void CollidoscopeApp::receiveCommands()

{

    // check new midi messages 

    static std::vector<collidoscope::MIDIMessage> midiMessages;

    mMIDI.checkMessages( midiMessages );

    for ( auto &m : midiMessages ){

        const size_t waveIdx = mConfig.getWaveForMIDIChannel( m.getChannel() );

        if ( waveIdx >= NUM_WAVES )

            continue;

        if ( m.getVoice() == collidoscope::MIDIMessage::Voice::eNoteOn ){

            int midiNote = m.getData_1();

            mAudioEngine.noteOn( waveIdx, midiNote );

        }

        else if ( m.getVoice() == collidoscope::MIDIMessage::Voice::eNoteOff ){

            int midiNote = m.getData_1();

            mAudioEngine.noteOff( waveIdx, midiNote );

        } 

        else if ( m.getVoice() == collidoscope::MIDIMessage::Voice::ePitchBend ){

            const uint16_t MSB = m.getData_2() << 7;

            uint16_t value = m.getData_1(); // LSB 

            value |= MSB;

            // value ranges from 0 to 149. check boundaries in case sensor gives bad values 

            if ( value > 149 ){ // FIXME can use wave.size() 

                continue;

            }

            size_t startChunk = value;

            const size_t selectionSizeBeforeStartUpdate = mWaves[waveIdx]->getSelection().getSize();

            mWaves[waveIdx]->getSelection().setStart( startChunk );

            mAudioEngine.setSelectionStart( waveIdx, startChunk * (mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks()) );

            const size_t newSelectionSize = mWaves[waveIdx]->getSelection().getSize();

            if ( selectionSizeBeforeStartUpdate != newSelectionSize ){

                mAudioEngine.setSelectionSize( waveIdx, newSelectionSize * (mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks()) );

            }

        }

        else if ( m.getVoice() == collidoscope::MIDIMessage::Voice::eControlChange ){

            switch ( m.getData_1() ){ //controller number 

            case 1: { // selection size 

                const size_t midiVal = m.getData_2();

                size_t numSelectionChunks = ci::lmap<size_t>( midiVal, 0, 127, 1, mConfig.getMaxSelectionNumChunks() );

                mWaves[waveIdx]->getSelection().setSize( numSelectionChunks );

                // how many samples in one selection ?

                size_t selectionSize = mWaves[waveIdx]->getSelection().getSize() * (mConfig.getWaveLen() * mAudioEngine.getSampleRate() / mConfig.getNumChunks());

                mAudioEngine.setSelectionSize( waveIdx, selectionSize );

            };

                break;

            case 4: { // loop on off

                unsigned char midiVal = m.getData_2();

                if ( midiVal > 0 )

                    mAudioEngine.loopOn( waveIdx );

                else

                    mAudioEngine.loopOff( waveIdx );

            };

                break;

            case 5: // trigger record

                mAudioEngine.record( waveIdx );

                break;

            case 2: { // duration 

                const double midiVal = m.getData_2(); // 0-127

                const double coeff = ci::lmap<double>( midiVal, 0.0, 127, 1.0, mConfig.getMaxGrainDurationCoeff() );

                mAudioEngine.setGrainDurationCoeff( waveIdx, coeff );

                mWaves[waveIdx]->getSelection().setParticleSpread( float( coeff ) );

            };

                break;

            case 7: { // filter 

                const double midiVal = m.getData_2(); // 0-127

                const double minCutoff = mConfig.getMinFilterCutoffFreq();

                const double maxCutoff = mConfig.getMaxFilterCutoffFreq();

                const double cutoff = pow( maxCutoff / 200., midiVal / 127.0 ) * minCutoff;

                mAudioEngine.setFilterCutoff( waveIdx, cutoff );

                const float alpha = ci::lmap<double>( midiVal, 0.0f, 127.0f, 0.f, 1.f );

                mWaves[waveIdx]->setselectionAlpha( alpha );

            };

                break;

            }

        }

    }

    midiMessages.clear();

}

CollidoscopeApp::~CollidoscopeApp()

{

    for ( int chan = 0; chan < NUM_WAVES; chan++ ){

        /* delete the array for wave messages from audio thread */

        delete[] mRecordWaveMessageBuffers[chan];

    }

}

CINDER_APP( CollidoscopeApp, RendererGl, [] ( App::Settings *settings) {

    const std::vector< string > args = settings->getCommandLineArgs();

    int width = 0;

    int height = 0;

    try {

        if( args.size() != 3 )

            throw std::invalid_argument("");

        width  = std::stoi( args[1] );

        height = std::stoi( args[2] );

    }

    catch( std::invalid_argument & e ){

        console() << "Error: invalid arguments" << std::endl;

        console() << "Usage: ./CollidoscopeApp window_width window_height" << std::endl;  

        console() << "For example: ./CollidoscopeApp 1024 768 " << std::endl;  

        settings->setShouldQuit( true );

        return;

    }

    settings->setWindowSize( width, height );

    settings->setMultiTouchEnabled( false );

    settings->disableFrameRate();

} )