MIDI2Melody.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "MIDI2Melody.hxx"

namespace CLAM {

MIDI2Melody::MIDI2Melody()
        : mOutput("Output",this),
          mTime("time",this)
{
        ConcreteConfigure(Control2DataConfig());
}
        
bool MIDI2Melody::GenerateOutputData(int id, TControlData val)
{
        switch(id)
        {
                case 0://key for note off
                {
                        //find the note with that key in the member buffers, remove it, add it to melody after computing duration
                        int index,velocity,beginTime,endTime;
                        index=FindNote(int(val));
                        if(index==-1) break; //I don't know why this happens but it does
                        velocity=(int) mVelocities[index];
                        beginTime=(int) mBeginTimes[index];
                        endTime=(int) mTime.GetLastValue();
                        DeleteNoteFromIndex(index);

                        MIDINote newNote;
                        newNote.SetKey(int(val));//should be MidiNote!
                        newNote.SetVelocity(velocity);//should be MidiVelocity
                        MediaTime time;
                        time.AddBegin();
                        time.AddEnd();
                        time.RemoveDuration();
                        time.UpdateData();
                        time.SetBegin(beginTime);
                        time.SetEnd(endTime);
                        newNote.SetTime(time);
                        mOutput.GetData().GetNoteArray().AddElem(newNote);

                        break;
                }
                case 1://velocity for note off
                {
                        //for the time being this will not be acknowledged
                        break;
                }
                case 2://key for note on
                {
                        //add note to member array with velocity 0 and modify mLastKey
                        AddNote(int(val),0,int(mTime.GetLastValue()));
                        mLastKey=int(val);
                        break;
                }
                case 3://velocity for note on
                {
                        //Modify velocity for mLastKey
                        ModifyVelocity(mLastKey,int(val));
                        break;
                }
                default:
                {
                        CLAM_ASSERT(false,"Not a valid MIDI control");
                }
        }
        return true;
}


bool MIDI2Melody::ConcreteConfigure(const ProcessingConfig& c)
{
        //Ugly, ugly. Don't try this at home.
        Control2DataConfig &tmp=const_cast<Control2DataConfig&>(dynamic_cast<const Control2DataConfig&>(c));
        //We harcode this value as the concrete MIDI2Melody now will only work on 4 controls
        tmp.SetNumControls(4);
        Control2Data::ConcreteConfigure(tmp);
        return true;
}

int MIDI2Melody::FindNote(int key)
{
        int index=-1;
        int i;
        for(i=0;i<mKeys.Size();i++)
        {
                if (mKeys[i]==key){
                index=i;
                break;
                }
        }
        return index;
}

void MIDI2Melody::AddNote(int key, int velocity,int time)
{
        mKeys.AddElem(key);
        mVelocities.AddElem(velocity);
        mBeginTimes.AddElem(time);
}

void MIDI2Melody::DeleteNote(int key)
{
        DeleteNoteFromIndex(FindNote(key));
}

void MIDI2Melody::DeleteNoteFromIndex(int index)
{
        mKeys.DeleteElem(index);
        mVelocities.DeleteElem(index);
        mBeginTimes.DeleteElem(index);
}

void MIDI2Melody::ModifyVelocity(int key,int newVelocity)
{       
        int index=FindNote(key);
        mVelocities[index]=newVelocity;
}

} // namespace CLAM