SynthElement.cpp

/*  Copyright © 2007 Apple Inc. All Rights Reserved.
    
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#include "SynthElement.h"
#include "AUInstrumentBase.h"

////////////////////////////////////////////////////////////////////////////////////////////////////////////
MidiControls::MidiControls()
{
    Reset();
}

void MidiControls::Reset()
{
    memset(this, 0, sizeof(MidiControls));
    mControls[kMidiController_Pan] = 64;
    mControls[kMidiController_Expression] = 127;
    mPitchBendDepth = 2 << 7;
    mFPitchBendDepth = 2.;
}


SynthElement::SynthElement(AUInstrumentBase *audioUnit, UInt32 inElement) 
    : AUElement(audioUnit), mName(0), mIndex(inElement)
{
}

SynthElement::~SynthElement()
{
    if (mName) CFRelease(mName);
}

SynthGroupElement::SynthGroupElement(AUInstrumentBase *audioUnit, UInt32 inElement) 
    : SynthElement(audioUnit, inElement), mSustainIsOn(false), mSostenutoIsOn(false), mOutputBus(0), mGroupID(kUnassignedGroup)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::SynthGroupElement %d\n", inElement);
#endif
    for (UInt32 i=0; i<kNumberOfSoundingNoteStates; ++i)
        mNoteList[i].mState = i;
}

void    SynthGroupElement::SetGroupID (MusicDeviceGroupID inGroup)
{
        // can't re-assign a group once its been assigned
    if (mGroupID != kUnassignedGroup) throw static_cast<OSStatus>(kAudioUnitErr_InvalidElement);
    mGroupID = inGroup;
}

void SynthGroupElement::Reset() 
{
#if DEBUG_PRINT
    printf("SynthGroupElement::Reset\n");
#endif
    mMidiControls.Reset();
    for (UInt32 i=0; i<kNumberOfSoundingNoteStates; ++i)
        mNoteList[i].Empty();
}

SynthPartElement::SynthPartElement(AUInstrumentBase *audioUnit, UInt32 inElement) 
    : SynthElement(audioUnit, inElement)
{
}

void SynthGroupElement::NoteOff(NoteInstanceID inNoteID, UInt32 inFrame)
{   
#if DEBUG_PRINT
    printf("SynthGroupElement::NoteOff %d\n", inNoteID);
#endif
    SynthNote *note = mNoteList[kNoteState_Attacked].mHead;
    // see if this note is attacked.
    while (note && note->mNoteID != inNoteID)
    {
#if DEBUG_PRINT
        printf("   ? %08X %d\n", note, note->mNoteID);
#endif
        note = note->mNext;
    }
    
#if DEBUG_PRINT
    printf("  found %08X\n", note);
#endif
    if (note)
    {
#if DEBUG_PRINT
        printf("  old state %d\n", note->mState);
#endif
        mNoteList[kNoteState_Attacked].RemoveNote(note);
        note->Release(inFrame);
        if (mSustainIsOn) {
            mNoteList[kNoteState_ReleasedButSustained].AddNote(note);
        } else {
            mNoteList[kNoteState_Released].AddNote(note);
        }
#if DEBUG_PRINT
        printf("  new state %d\n", note->mState);
#endif
    }
    else if (mSostenutoIsOn)
    {
        // see if this note is sostenutoed.
        note = mNoteList[kNoteState_Sostenutoed].mHead;
        while (note && note->mNoteID != inNoteID)
            note = note->mNext;
        if (note)
        {
            mNoteList[kNoteState_Sostenutoed].RemoveNote(note);
            mNoteList[kNoteState_ReleasedButSostenutoed].AddNote(note);
        }
    }
}

void SynthGroupElement::NoteEnded(SynthNote *inNote, UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::NoteEnded %d %d\n", inNote->mNoteID, inNote->mState);
#endif
    SynthNoteList *list = mNoteList + inNote->mState;
    list->RemoveNote(inNote);
    
    GetAUInstrument()->AddFreeNote(inNote);
}

void SynthGroupElement::SostenutoOn(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::SostenutoOn\n");
#endif
    mSostenutoIsOn = true;
    mNoteList[kNoteState_Sostenutoed].TransferAllFrom(&mNoteList[kNoteState_Attacked], inFrame);
}

void SynthGroupElement::SostenutoOff(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::SostenutoOff\n");
#endif
    mSostenutoIsOn = false;
    mNoteList[kNoteState_Attacked].TransferAllFrom(&mNoteList[kNoteState_Sostenutoed], inFrame);
    if (mSustainIsOn) 
        mNoteList[kNoteState_ReleasedButSustained].TransferAllFrom(&mNoteList[kNoteState_ReleasedButSostenutoed], inFrame);
    else
        mNoteList[kNoteState_Released].TransferAllFrom(&mNoteList[kNoteState_ReleasedButSostenutoed], inFrame);
}


void SynthGroupElement::SustainOn(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::SustainOn\n");
#endif
    mSustainIsOn = true;    
}

void SynthGroupElement::SustainOff(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::SustainOff\n");
#endif
    mSustainIsOn = false;
    
    mNoteList[kNoteState_Released].TransferAllFrom(&mNoteList[kNoteState_ReleasedButSustained], inFrame);
}

void SynthGroupElement::AllNotesOff(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::AllNotesOff\n");
#endif
    SynthNote *note;
    
    for (UInt32 i=0 ; i<kNumberOfActiveNoteStates; ++i)
    {
        note = mNoteList[i].mHead;
        while (note)
        {
            SynthNote *nextNote = note->mNext;
            
            mNoteList[i].RemoveNote(note);
            note->FastRelease(inFrame);
            mNoteList[kNoteState_FastReleased].AddNote(note);
            
            note = nextNote;
        }
    }   
}

void SynthGroupElement::AllSoundOff(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::AllSoundOff\n");
#endif
    AllNotesOff(inFrame);
}

void SynthGroupElement::ResetAllControllers(UInt32 inFrame)
{
#if DEBUG_PRINT
    printf("SynthGroupElement::ResetAllControllers\n");
#endif
    mMidiControls.Reset();
}

OSStatus SynthGroupElement::Render(UInt32 inNumberFrames)
{
    SynthNote *note;
    AudioBufferList& bufferList = GetAudioUnit()->GetOutput(mOutputBus)->GetBufferList();
    
    for (UInt32 i=0 ; i<kNumberOfSoundingNoteStates; ++i)
    {
        note = mNoteList[i].mHead;
        while (note)
        {
#if DEBUG_PRINT
            printf("   note %d %08X   %d\n", i, note, inNumberFrames);
#endif
            SynthNote *nextNote = note->mNext;
            
            OSStatus err = note->Render(inNumberFrames, bufferList);
            if (err) return err;
            
            note = nextNote;
        }
    }
    
    return noErr;
}