Synthesizer Class Reference

A simple Synthesizer which can generate sound having multiple keys pressed. The main purpose of this class is managing the synthezizer channels. More...

#include <Synthesizer.h>

Inheritance diagram for Synthesizer:

Classes
struct	KeyParameter

Public Member Functions
	Synthesizer (AbstractSynthesizerChannel *ch)
	Synthesizer (Synthesizer const &)=delete
virtual AudioInfo	audioInfo ()
	Provides the AudioInfo.
virtual bool	begin ()
bool	begin (AudioInfo config)
virtual AudioInfo	defaultConfig ()
	Provides the default configuration.
virtual void	end ()
	ends the processing
virtual bool	isActive ()
void	keyOff (int note)
void	keyOn (int note, float tgt=0)
Synthesizer &	operator= (Synthesizer const &)=delete
virtual size_t	readBytes (uint8_t *data, size_t len)
	Provides the data as byte array with the requested number of channels.
int16_t	readSample () override
	Provides mixed samples of all channels.
virtual void	setAudioInfo (AudioInfo info)
	Defines/updates the AudioInfo.
virtual void	setFrequency (float frequency)
	Abstract method: not implemented! Just provides an error message...
void	setKeys (AudioActions &actions, SynthesizerKey *p_keys, AudioActions::ActiveLogic activeValue)
	Assigns pins to notes - the last SynthesizerKey is marked with an entry containing the note <= 0.
void	setMidiName (const char *name)
	Defines the midi name.
void	setPlayTime (uint32_t playMs, uint8_t upPercent=20, uint8_t downPercent=30)

Protected Member Functions
int16_t	applyRamp (int16_t sample)
AbstractSynthesizerChannel *	getFreeChannel ()
AbstractSynthesizerChannel *	getNoteChannel (int note)
size_t	readBytesFrames (uint8_t *buffer, size_t lengthBytes, int frames, int channels)
size_t	readBytesFromBuffer (uint8_t *buffer, size_t lengthBytes, int frame_size, int channels)
void	recalculatePlayTime ()

Static Protected Member Functions
static void	callbackKeyOff (bool active, int pin, void *ref)
static void	callbackKeyOn (bool active, int pin, void *ref)

Protected Attributes
bool	active
bool	activeWarningIssued
AudioInfo	cfg
Vector< AbstractSynthesizerChannel * >	channels
uint32_t	currentSample
AbstractSynthesizerChannel *	defaultChannel
uint8_t	downPercent
float	factor
AudioInfo	info
const char *	midi_name = "Synthesizer"
uint32_t	playMs
uint32_t	playSamples
float	rampDownDec
uint32_t	rampDownSamples
float	rampUpInc
RingBuffer< uint8_t >	ring_buffer
uint8_t	upPercent
uint32_t	upSamples

Detailed Description

A simple Synthesizer which can generate sound having multiple keys pressed. The main purpose of this class is managing the synthezizer channels.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

begin()

bool begin ( AudioInfo  config )

inlinevirtual

Reimplemented from SoundGenerator< int16_t >.

isActive()

virtual bool isActive ( )

inlinevirtualinherited

Checks if the begin method has been called - after end() isActive returns false

readSample()

int16_t readSample ( )

inlineoverridevirtual

Provides mixed samples of all channels.

Implements SoundGenerator< int16_t >.

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The documentation for this class was generated from the following file:

• src/AudioTools/CoreAudio/AudioEffects/Synthesizer.h