SynthNoteList.h

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#ifndef __SynthNoteList__
#define __SynthNoteList__

#include "SynthNote.h"

#if DEBUG
#ifndef DEBUG_PRINT
    #define DEBUG_PRINT 0
#endif
    #define SANITY_CHECK 0
#endif

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

struct SynthNoteList
{
    SynthNoteList() : mState(0xFFFFFFFF), mHead(0), mTail(0) {}
    
    bool NotEmpty() const { return mHead != NULL; }
    bool IsEmpty() const { return mHead == NULL; }
    void Empty() { 
#if SANITY_CHECK
        SanityCheck();
#endif
        mHead = mTail = NULL; 
    }
    
    UInt32 Length() const {
#if SANITY_CHECK
        SanityCheck();
#endif
        UInt32 length = 0;
        for (SynthNote* note = mHead; note; note = note->mNext) 
            length++;
        return length;
    };
    
    void AddNote(SynthNote *inNote)
    {
#if DEBUG_PRINT
        printf("AddNote %d %08X\n", mState, inNote);
#endif
#if SANITY_CHECK
        SanityCheck();
#endif
        inNote->mState = mState;
        inNote->mNext = mHead;
        inNote->mPrev = NULL;
        
        if (mHead) { mHead->mPrev = inNote; mHead = inNote; }
        else mHead = mTail = inNote;
#if SANITY_CHECK
        SanityCheck();
#endif
    }
    
    void RemoveNote(SynthNote *inNote)
    {
#if DEBUG_PRINT
        printf("RemoveNote\n");
#endif
#if SANITY_CHECK
        SanityCheck();
#endif
        if (inNote->mPrev) inNote->mPrev->mNext = inNote->mNext;
        else mHead = inNote->mNext;

        if (inNote->mNext) inNote->mNext->mPrev = inNote->mPrev;
        else mTail = inNote->mPrev;
        
        inNote->mPrev = 0;
        inNote->mNext = 0;
#if SANITY_CHECK
        SanityCheck();
#endif
    }

    void TransferAllFrom(SynthNoteList *inNoteList, UInt32 inFrame)
    {
#if DEBUG_PRINT
        printf("TransferAllFrom\n");
#endif
#if SANITY_CHECK
        SanityCheck();
        inNoteList->SanityCheck();
#endif
        if (!inNoteList->mTail) return;
        
        if (mState == kNoteState_Released)
        {
            for (SynthNote* note = inNoteList->mHead; note; note = note->mNext)
            {
#if DEBUG_PRINT
                printf("TransferAllFrom release %08X\n", note);
#endif
                note->mState = mState;
                note->Release(inFrame);
            }
        }
        else
        {
            for (SynthNote* note = inNoteList->mHead; note; note = note->mNext)
            {
                note->mState = mState;
            }
        }
        
        inNoteList->mTail->mNext = mHead;
        
        if (mHead) mHead->mPrev = inNoteList->mTail;
        else mTail = inNoteList->mTail;
        
        mHead = inNoteList->mHead;
        
        inNoteList->mHead = NULL;
        inNoteList->mTail = NULL;
#if SANITY_CHECK
        SanityCheck();
        inNoteList->SanityCheck();
#endif
    }
    
    SynthNote* FindOldestNote()
    {
#if DEBUG_PRINT
        printf("FindOldestNote\n");
#endif
#if SANITY_CHECK
        SanityCheck();
#endif
        SInt64 minStartFrame = -1;
        SynthNote* oldestNote = NULL;
        for (SynthNote* note = mHead; note; note = note->mNext)
        {
            if (note->mAbsoluteStartFrame < minStartFrame)
            {
                oldestNote = note;
                minStartFrame = note->mAbsoluteStartFrame;
            }
        }
        return oldestNote;
    }
    
    SynthNote* FindMostQuietNote()
    {
#if DEBUG_PRINT
        printf("FindMostQuietNote\n");
#endif
        Float32 minAmplitude = 1e9;
        SInt64 minStartFrame = -1;
        SynthNote* mostQuietNote = NULL;
        for (SynthNote* note = mHead; note; note = note->mNext)
        {
            Float32 amp = note->Amplitude();
#if DEBUG_PRINT
            printf("   amp %g   minAmplitude %g\n", amp, minAmplitude);
#endif
            if (amp < minAmplitude)
            {
                mostQuietNote = note;
                minAmplitude = amp;
                minStartFrame = note->mAbsoluteStartFrame;
            }
            else if (amp == minAmplitude && note->mAbsoluteStartFrame < minStartFrame)
            {
                // use earliest start time as a tie breaker
                mostQuietNote = note;
                minStartFrame = note->mAbsoluteStartFrame;
            }
        }
#if SANITY_CHECK
        SanityCheck();
#endif
        return mostQuietNote;
    }
    
    void SanityCheck() const;
    
    UInt32 mState;
    SynthNote *mHead;
    SynthNote *mTail;
};

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#endif