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/*
File: SynthNote.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the following
terms, and your use, installation, modification or redistribution of
this Apple software constitutes acceptance of these terms. If you do
not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any
patent rights that may be infringed by your derivative works or by other
works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
#ifndef __SynthNote__
#define __SynthNote__
#include <AudioUnit/AudioUnit.h>
#include <CoreAudio/CoreAudio.h>
#include "MusicDeviceBase.h"
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
enum SynthNoteState {
kNoteState_Attacked = 0,
kNoteState_Sostenutoed = 1,
kNoteState_ReleasedButSostenutoed = 2,
kNoteState_ReleasedButSustained = 3,
kNoteState_Released = 4,
kNoteState_FastReleased = 5,
kNoteState_Free = 6,
kNumberOfActiveNoteStates = 5,
kNumberOfSoundingNoteStates = 6,
kNumberOfNoteStates = 7,
kNoteState_Unset = kNumberOfNoteStates
};
/*
This table describes the state transitions for SynthNotes
EVENT CURRENT STATE NEW STATE
note on free attacked
note off attacked (and sustain on) released but sustained
note off attacked released
note off sostenutoed released but sostenutoed
sustain on -- no changes --
sustain off released but sustained released
sostenuto on attacked sostenutoed
sostenuto off sostenutoed attacked
sostenuto off released but sostenutoed (and sustain on) released but sustained
sostenuto off released but sostenutoed released
end of note any state free
soft voice stealing any state fast released
hard voice stealing any state free
soft voice stealing happens when there is a note on event and NumActiveNotes > MaxActiveNotes
hard voice stealing happens when there is a note on event and NumActiveNotes == NumNotes (no free notes)
voice stealing removes the quietest note in the highest numbered state that has sounding notes.
*/
class SynthGroupElement;
class SynthPartElement;
class AUInstrumentBase;
struct SynthNote
{
SynthNote() :
mPrev(0), mNext(0), mPart(0), mGroup(0),
mNoteID(0xffffffff),
mState(kNoteState_Unset),
mAbsoluteStartFrame(0),
mRelativeStartFrame(0),
mRelativeReleaseFrame(-1),
mRelativeKillFrame(-1),
mPitch(0.0f),
mVelocity(0.0f)
{
}
virtual ~SynthNote() {}
virtual void Reset();
//! Returns true if active note resulted from this call, otherwise false
virtual bool AttackNote(
SynthPartElement * inPart,
SynthGroupElement * inGroup,
NoteInstanceID inNoteID,
UInt64 inAbsoluteSampleFrame,
UInt32 inOffsetSampleFrame,
const MusicDeviceNoteParams &inParams
);
virtual OSStatus Render(UInt64 inAbsoluteSampleFrame, UInt32 inNumFrames, AudioBufferList** inBufferList, UInt32 inOutBusCount) = 0;
//! Returns true if active note resulted from this call, otherwise false
virtual bool Attack(const MusicDeviceNoteParams &inParams) = 0;
virtual void Kill(UInt32 inFrame); // voice is being stolen.
virtual void Release(UInt32 inFrame);
virtual void FastRelease(UInt32 inFrame);
virtual Float32 Amplitude() = 0; // used for finding quietest note for voice stealing.
virtual void NoteEnded(UInt32 inFrame);
SynthGroupElement* GetGroup() const { return mGroup; }
SynthPartElement* GetPart() const { return mPart; }
AUInstrumentBase* GetAudioUnit() const;
Float32 GetGlobalParameter(AudioUnitParameterID inParamID) const;
NoteInstanceID GetNoteID() const { return mNoteID; }
SynthNoteState GetState() const { return mState; }
UInt8 GetMidiKey() const { return (UInt8) mPitch; }
UInt8 GetMidiVelocity() const { return (UInt8) mVelocity; }
Boolean IsSounding() const { return mState < kNumberOfSoundingNoteStates; }
Boolean IsActive() const { return mState < kNumberOfActiveNoteStates; }
UInt64 GetAbsoluteStartFrame() const { return mAbsoluteStartFrame; }
SInt32 GetRelativeStartFrame() const { return mRelativeStartFrame; }
SInt32 GetRelativeReleaseFrame() const { return mRelativeReleaseFrame; }
SInt32 GetRelativeKillFrame() const { return mRelativeKillFrame; }
void ListRemove() { mPrev = mNext = 0; } // only use when lists will be reset.
float GetPitchBend() const;
double TuningA() const;
Float32 GetPitch() const { return mPitch; } // returns raw pitch from MusicDeviceNoteParams
virtual double Frequency(); // returns the frequency of note + pitch bend.
virtual double SampleRate();
// linked list pointers
SynthNote *mPrev;
SynthNote *mNext;
friend class SynthGroupElement;
friend struct SynthNoteList;
protected:
void SetState(SynthNoteState inState) { mState = inState; }
private:
SynthPartElement* mPart;
SynthGroupElement* mGroup;
NoteInstanceID mNoteID;
SynthNoteState mState;
UInt64 mAbsoluteStartFrame;
SInt32 mRelativeStartFrame;
SInt32 mRelativeReleaseFrame;
SInt32 mRelativeKillFrame;
Float32 mPitch;
Float32 mVelocity;
};
#endif
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